Patent Publication Number: US-2022231368-A1

Title: Frame body, battery pack, and device

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a continuation of International Application No. PCT/CN2021/082082, filed on Mar. 22, 2021, which claims priority to Chinese Patent Application No. 202020419984.8, filed on Mar. 27, 2020, and Chinese Patent Application No. 202011568483.7, filed on Dec. 25, 2020, all of which are incorporated herein by reference in their entireties. 
    
    
     FIELD 
     The disclosure relates to a technical field of battery, and in particular to a frame body, a battery pack, and a device. 
     BACKGROUND 
     A lower housing of a battery package is a carrier of all components, and its structural strength and sealing performance are particularly important. At present, a lower housing generally includes a bottom plate, a side frame, a fastener, and other parts, and each part is manufactured by lap joint or tailor welding. However, stress concentration is easily formed at a welding seam of the side frame to cause a risk of failure. 
     SUMMARY 
     The purpose of the present application is to provide a frame body, a battery pack, and a device, and the frame body has a high connection strength and rigidity. 
     In a first aspect, an embodiment of the present application proposes a frame body including a first bracket including a first mold chamber; a second bracket connected end-to-end with the first bracket to form a receiving cavity, the second bracket including a second mold chamber; and a block including a first reinforcement portion and a second reinforcement portion, wherein the first reinforcement portion is received in the first mold chamber, the second reinforcement portion is received in the second mold chamber, and the block is adapted to connect the first bracket with the second bracket. 
     According to an aspect of an embodiment of the present application, the first bracket includes a first end close to the second bracket, and the first reinforcement portion is received in the first mold chamber of the first end; and the second bracket includes a second end close to the first bracket, and the second reinforcement portion is received in the second mold chamber of the second end. 
     According to an aspect of an embodiment of the present application, the first bracket includes a first outer top wall, the second bracket includes a second outer top wall, the first outer top wall is welded to the second outer top wall, and an end portion close to an inner portion of the frame body of a welding line of the first outer top wall and the second outer top wall is defined as a first line segment; and the first reinforcement portion is received in the first mold chamber of the first bracket, fixed to the first bracket, and the second reinforcement portion is received in the second mold chamber of the second bracket, fixed to the second bracket, wherein an outer surface of the block includes a first region, and an orthographic projection of the first line segment on a plane where the first region is located falls within the first region. 
     According to an aspect of an embodiment of the present application, an intersecting line of the first outer top wall and the second outer top wall further includes a second line segment, while the first line segment intersects non-collinearly with the second line segment. 
     According to an aspect of an embodiment of the present application, the first bracket includes two side walls arranged along a first direction, the first outer top wall is an outer wall for connecting the two side walls of the first bracket, the first bracket further includes a first hollow cavity, and the first hollow cavity and the first mold chamber are arranged along the first direction; and the second bracket includes two side walls arranged along a second direction, the second outer top wall is an outer wall for connecting the two side walls of the second bracket, the second bracket further includes a second hollow cavity, and the second hollow cavity and the second mold chamber are arranged along the second direction. 
     According to an aspect of an embodiment of the present application, the frame body further includes a first connecting member for fixing the first reinforcement portion to the first bracket; and a second connecting member for fixing the second reinforcement portion to the second bracket. 
     According to an aspect of an embodiment of the present application, the first connecting member includes a head and a connecting portion, the first mold chamber and the first hollow cavity each is arranged in a column, the first mold chamber is disposed close to an outer side of the frame body, the first hollow cavity is disposed close to an internal portion of the frame body, and the first hollow cavity is adapted to receive the head of the first connecting member; and the second connecting member includes a head and a connecting portion, the second mold chamber and the second hollow cavity each is arranged in a column, the second mold chamber is disposed close to the outer side of the frame body, the second hollow cavity is disposed close to the internal portion of the frame body, and the second hollow cavity is adapted to receive the head of the second connecting member. 
     According to an aspect of an embodiment of the present application, the block includes a raised portion protruding towards the internal portion of the frame body from an intersecting portion of the first reinforcement portion and the second reinforcement portion, and the outer surface of the raised portion includes the first region. 
     According to an aspect of an embodiment of the present application, a first internal portion wall in the two side walls of the first bracket facing the internal portion of the frame body is provided with a first notch region, a second internal portion wall of the two side walls of the second bracket facing the internal portion of the frame body is provided with a second notch region, and the first notch region and the second notch region are both adapted to avoid the raised portion. 
     According to an aspect of an embodiment of the present application, the first reinforcement portion includes a plurality of first reinforcement blocks, the first bracket includes a plurality of first mold chambers, and each of said plurality of first reinforcement blocks is received in a first mold chamber corresponding to said plurality of first mold chambers; and the second reinforcement portion includes a plurality of second reinforcement blocks, the second bracket includes a plurality of second mold chambers, and each of said plurality of second reinforcement blocks is received in a second mold chamber corresponding to said plurality of second mold chambers. 
     According to an aspect of an embodiment of the present application, the plurality of first reinforcement blocks are arranged along a third direction, the plurality of second reinforcement blocks are arranged along a third direction, and the third direction is a height direction of the first bracket. 
     According to an aspect of an embodiment of the present application, the first connecting member is adapted to fix at least one first reinforcement block of said plurality of first reinforcement blocks to the first bracket; and the second connecting member is adapted to fix at least one second reinforcement block of said plurality of second reinforcement blocks to the second bracket. 
     According to an aspect of an embodiment of the present application, the raised portion protrudes towards the internal portion of the frame body from an intersecting portion of the at least one first reinforcement block and the at least one second reinforcement block. 
     According to an aspect of an embodiment of the present application, a plurality of first connecting members are disposed on the at least one first reinforcement block; and a plurality of second connecting members are disposed on the at least one second reinforcement block. 
     According to an aspect of an embodiment of the present application, a plurality of first connecting members are arranged along a second direction, a distance between a position of said plurality of first connecting members and a first end of the corresponding first reinforcement block accounts a length of one-sixth to one-half of the corresponding first reinforcement block in the second direction, and the first end is an end of the corresponding first reinforcement block away from the second wall; and a plurality of second connecting members are arranged along the first direction, a distance between a position of said second connecting members and a second end of the corresponding second reinforcement block accounts a length of one-sixth to one-half of the corresponding second reinforcement block in the first direction, and the second end is an end of the corresponding second reinforcement block away from the first wall. 
     In another aspect, an embodiment of the present application further proposes a battery pack including: a plurality of battery cells; an upper housing; a bottom plate; and the frame body as described above, wherein the bottom plate and the frame body form a lower housing, and the lower housing is covered and closed by the upper housing forming an enclosed space for receiving a plurality of battery cells. 
     In another aspect, an embodiment of the present application further proposes a device using a battery pack as a power source, including: the battery pack as described above, the battery pack is adapted to provide electrical energy. 
     In another aspect, an embodiment of the present application further proposes a method for producing a frame body of a battery, including: providing a plurality of first brackets and a plurality of second brackets to form a receiving cavity of the frame body, t first mold chamber is provided inside the first bracket, a second mold chamber is provided inside the second bracket, the first bracket includes a first outer top wall, the second bracket includes a second outer top wall, the first outer top wall being welded to the second outer top wall, and an end portion of a welding line between the first outer top wall and the second outer top wall close to an internal portion of the frame body is defined as a first line segment; and providing a block, the block including a first reinforcement portion and a second reinforcement portion being connected with each other, the first reinforcement portion being received in the first mold chamber of the first bracket and fixed to the first bracket, and the second reinforcement portion being received in the second mold chamber of the second bracket and fixed to the second bracket, wherein an outer surface of the block includes a first region, and an orthographic projection of the first line segment on a plane where the first region is located falls within the first region. 
     In another aspect, an embodiment of the present application further proposes a device for producing a frame body of a battery, and the device includes a providing module, the providing module being adapted to provide a plurality of first brackets and a plurality of second brackets to form a receiving space for the frame body, a first mold chamber is provided inside a first bracket, a second mold chamber is provided inside a second bracket, the first bracket including a first outer top wall, the second bracket including a second outer top wall, the first outer top wall being welded to the second outer top wall, and an end portion of a welding line between the first outer top wall and the second outer top wall close to an internal portion of the frame body being defined as a first line segment; and a block, the block including a first reinforcement portion and a second reinforcement portion being connected with each other, the first reinforcement portion being received in the first mold chamber of the first bracket and fixed to the first bracket, and the second reinforcement portion being received in the second mold chamber of the second bracket and fixed to the second bracket, wherein an outer surface of the block includes a first region, and an orthographic projection of the first line segment on a plane where the first region is located falls within the first region. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In order to more clearly describe the technical solutions of the embodiments of the present application, drawings that need to be used in the embodiments of the present application will be briefly introduced as below, and it is obvious for those skilled in the art that the drawings described below are only some embodiments of the present application and other drawings can be obtained based on the drawings without creative work. 
         FIG. 1  is a schematic view of a structure of a vehicle disclosed by an embodiment of the present application; 
         FIG. 2  is a schematic view of an exploded structure of a battery pack disclosed by an embodiment of the present application; 
         FIG. 3  is a schematic view of a structure of a lower housing disclosed by an embodiment of the present application; 
         FIG. 4  is a schematic view of an enlarged structure of a region A in  FIG. 3 ; 
         FIG. 5  is a schematic view of a partial exploded structure of a frame body provided by an embodiment of the present application; 
         FIG. 6  is a schematic view of a structure of a welding seam of a frame body shown in  FIG. 5 ; 
         FIG. 7  is a schematic view of a partial exploded structure of another frame body provided by an embodiment of the present application; 
         FIG. 8  is a schematic view of a structure of a welding seam of a frame body shown in  FIG. 7 ; 
         FIG. 9  is a schematic view of an exploded structure of a battery pack disclosed by another embodiment of the present application; 
         FIG. 10  is an installation diagram of a second component and a battery pack in  FIG. 9 ; 
         FIG. 11  is a schematic view of a second component disclosed by another embodiment of the present application; 
         FIG. 12  is a top view of a second component in  FIG. 11 ; 
         FIG. 13  is a partial exploded view of a second component shown in  FIG. 12 ; 
         FIG. 14  is a partial enlarged view of a region A in  FIG. 13 ; 
         FIG. 15  is a partial cross-sectional view of an upper left corner region in  FIG. 12 ; 
         FIG. 16  is a schematic cross-sectional view of a first wall disclosed by an embodiment of the present application; 
         FIG. 17  is a schematic view of a fixing way between a first outer top wall of a first wall and a second outer top wall of a second wall disclosed by an embodiment of the present application; 
         FIG. 18  is a schematic view of another fixing way between a first outer top wall of a first wall and a second outer top wall of a second wall disclosed by an embodiment of the present application; 
         FIG. 19  is a schematic flowchart of a method for producing a frame body of a battery pack disclosed by an embodiment of the present application; and 
         FIG. 20  is a schematic block view of a device for producing a frame body of a battery pack disclosed by an embodiment of the present application. 
     
    
    
     DETAILED DESCRIPTION 
     The embodiments of the present application are described in further detail below with reference to the drawings and embodiments. The detailed description and drawings of the following embodiments are used to exemplarily illustrate the principle of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments. 
     In the description of the present application, it should be noted that, unless otherwise stated, “multiple” means more than two; the orientation or position relationship indicated by the terms “upper”, “lower”, “left”, “right”, “inner”, “outside”, and the like is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or must be configured and operated in a specific orientation, and thus these terms should not be understood to limit the present application. Moreover, the terms “first”, “second”, “third”, and the like are used for descriptive purposes only and should not be understood to indicate or imply relative importance. “Perpendicular” is not perpendicular in strict sense, but within a tolerance range. “Parallel” is not parallel in strict sense, but within a tolerance range. 
     The orientation words present in the following description refer to the directions shown in the drawings, and do not limit the specific structure of the present application. In the description of the present application, it should also be noted that, unless otherwise specified and limited, the terms “install”, “connected with”, and “connect” should be understood in a broad sense, for example, they can be fixed connection, removable connection, or integral connection; and can be direct connection or indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the terms in the present application described above can be understood according to specific conditions. 
     For brevity, in different embodiments, detailed description of the same component is omitted. It should be understood that the thickness, length, width, and other dimension of various components as well as the overall thickness, length, width, and other dimension of the integrated device in the embodiments of the present application shown in the drawings are only described exemplarily and should not constitute any limitation to the present application. 
     “Multiple” present in the present application refers to two or more (including two), “multiple groups of” similarly refers to two or more groups (including two groups), and “multiple pieces” refers to two or more pieces (including two pieces). 
     In the present application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiments of the present application. The battery cell may be in a cylindrical, flat, rectangular, or other shape, which is also not limited in the embodiments of the present application. According to the way of encapsulating, the battery cell is generally divided into three types: a cylindrical battery cell, a cuboid battery cell, and a soft-packed battery cell, which is also not limited in the embodiments of the present application. 
     The battery pack mentioned in the embodiments of the present application refers to a single physical module which includes one or more battery cells to provide high voltage and capacity. For example, the battery pack mentioned in the present application may include a battery module or a battery package. The battery pack generally includes a housing for encapsulating one or more battery cells. The housing can avoid liquid or other foreign objects from affecting the charging or discharging of the battery cell. 
     The battery cell includes an electrode assembly and electrolyte, and the electrode assembly is composed of a positive electrode plate, a negative electrode plate, and a separator. The battery cell mainly operations by means of the movement of a metal ion between the positive electrode plate and the negative electrode plate. The positive electrode plate includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on a surface of the positive electrode current collector, and a portion of the current collector which is not coated with the positive electrode active material layer protrudes beyond a portion of the current collector which is coated with the positive electrode active material layer and is used as a positive electrode tab. Taking a lithium ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative electrode plate includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on a surface of the negative electrode current collector, and a portion of the current collector which is not coated with the negative electrode active material layer protrudes beyond a portion of the current collector which is coated with the negative electrode active material layer and is used as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon, silicon, or the like. In order to ensure that a large current is passed without fusing, the number of positive electrode tabs is multiple and the positive electrode tabs are stacked together, and the number of negative electrode tabs is multiple and the negative electrode tabs are stacked together. The material of the separator may be PP, PE, or the like. Moreover, the electrode assembly may be a winding structure or a stacked plate structure, and the embodiments of the present application are not limited thereto. 
     The housing of the battery pack in the embodiments of the present application is used to receive a plurality of battery cells, a bus component, and other components of the battery. In some embodiments, a structure for fixing the battery cells may also be disposed in the housing. The shape of the housing can be determined according to the received plurality of battery cells. In some embodiments, the housing may be cuboid with six walls. 
     The bus component mentioned in the present application is used to realize the electrical connection, for example parallel connection, series connection, or any combination thereof, among a plurality of battery cells. The bus component can realize the electrical connection between the battery cells by connecting electrode terminals of the battery cells. In some embodiments, the bus component may be fixed to the electrode terminal of the battery cell by welding. 
     It should be understood that the individual components in the housing of the battery pack described above should not be understood as a limitation to the embodiments of the present application, that is to say, the housing for the battery pack of the embodiments of the present application may include or not include the components described above. 
     The technical solutions described by the embodiments of the present application are applied to various devices that use battery packs as power sources. The device can be, for example, but not limited to a mobile phone, a portable device, a notebook computer, a motor pedal, an electric toy, a power tool, a vehicle, a ship, a spacecraft, or the like, and for example, the spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, or the like. 
     It should be understood that the technical solutions described in the embodiments of the present application may not only be applied to the devices described above, but also be applied to all devices that use the battery packs, but for brief description, the description is made by taking a vehicle as an example in the following embodiments. 
       FIG. 1  is a schematic view of a structure of a vehicle provided by an embodiment of the present disclosure. With reference to  FIG. 1 , the vehicle  100  may be a fuel vehicle, a gas vehicle, a new energy vehicle, or the like, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, a range-extended vehicle, or the like. A motor, a controller, and a battery pack  20  may be disposed within the vehicle  100 , and the controller is used to control the battery pack  20  to supply power to the motor. For example, the battery pack  20  may be disposed on the bottom, in the front, or in the rear of the vehicle  100 . The battery pack  20  can be used to supply power to the vehicle  100 , for example, can be used as an operating power source of the vehicle  100 , and the battery pack  20  can be used for a circuit system of the vehicle  100 , for example, can be used for the requirement on the operation electricity when the vehicle  100  starts, navigates, and runs. In another embodiment of the present application, the battery pack  20  can be used not only as the operating power source of the vehicle  100 , but also as a driving power source of the vehicle  100 , and alternatively or partially replaces fuel or natural gas to provide driving power for the vehicle  100 . 
     In order to satisfy different requirements on the electricity usage, the battery pack  20  may include a plurality of battery cells. For example,  FIG. 2  is a schematic view of an exploded structure of a battery pack according to an embodiment of the present application. The battery pack  20  may include a plurality of battery cells  3 . According to different requirements on the electricity, the number of battery cells  3  can be set to any value. The plurality of battery cells  3  can be connected in series, in parallel, or any combination thereof to realize large capacity or power. Since the number of battery cells  3  included in each battery pack  20  may be large, the battery cells  3  may be disposed in groups in order to facilitate installation, and each group of battery cells  3  constitutes a battery module. The number of battery cells  3  included in the battery module is not limited and can be set according to requirements. The battery pack may include a plurality of battery modules, and these battery modules may be connected in series, in parallel, or any combination thereof. 
     Optionally, the battery pack  20  may further include other structures. For example, the battery pack  20  may further include a bus component, which is used to realize an electrical connection, for example, a parallel connection, a series connection, or any combination thereof, among the plurality of battery cells  3 . Specifically, the bus component can realize the electrical connection between the battery cells  3  by connecting electrode terminals of the battery cells  3 . Further, the bus component may be fixed to the electrode terminals of the battery cells  3  by welding. The electric energy of the plurality of battery cells  3  can be further drawn out through a housing by a conductive mechanism. Optionally, the conductive mechanism may alternatively belong to the bus component. 
     The battery pack  20  may further include a housing (or a cover), an internal portion of the housing is a hollow structure, and a plurality of battery cells  3  are received in the housing. As shown in  FIG. 2 , the housing may include two parts, which are referred to herein as a first component and a second component (or may also be referred to as an upper housing  2  and a lower housing  10 ), and the upper housing  2  and the lower housing  10  are buckled together. The shapes of the upper housing  2  and the lower housing  10  may be determined according to the combined shape of said plurality of battery cells  3 , and at least one component of the upper housing  2  and the lower housing  10  includes an opening. Optionally, both the upper housing  2  and the lower housing  10  included in the housing in an embodiment of the present application may each be hollow cuboid and only one of the surfaces is an opening face, the opening of the upper housing  2  and the opening of the lower housing  10  are disposed opposite to each other, and the upper housing  2  and the lower housing  10  are buckled with each other to form the housing with an enclosed chamber. Said plurality of battery cells  3  are connected in parallel, in series, or any combination thereof, then being placed in the housing formed by the upper housing  2  and the lower housing  10  buckling together. 
     In an embodiment, the battery pack  20  includes an upper housing  2 , a lower housing  10 , and a plurality of battery cells  3 . As shown in  FIG. 2 , the lower housing  10  includes a bottom plate  4  and a frame body  1 , the upper housing  2  covers and encloses the lower housing  10  to form an enclosed space for receiving said plurality of battery cells  3  arranged side by side in the enclosed space. For convenience of description, the description is made by taking the housing shown in  FIG. 2  as an example in the embodiments of the present application, but the embodiments of the present application are not limited thereto. 
       FIG. 3  shows a schematic view of a structure of the lower housing provided by an embodiment of the present application, and as shown in  FIG. 3 , the structural strength and sealing performance of the lower housing  10  of the housing is particularly important since the lower housing  10  of the housing is a carrier of each internal components. At present, the bottom plate  4  of the lower housing  10  with the frame body  1  and other parts are manufactured by lap joint and tailor welding. However, stress concentration is easily formed at welding seams between each frame bodies  1 , and the strength of the welding seams is low, thereby causing a risk of failure and not satisfying the requirement on the strength of the housing. If the strength of the housing is increased by adding a reinforcement supporter within the lower housing  10 , it is necessary for the reinforcement supporter to occupy the internal space of the lower housing  10 , thereby causing low utilization of the internal space of the lower housing  10  and affecting the installation of the battery cell  3 . 
     Therefore, an embodiment of the present application provides a frame body  1 , and a reinforcement structure is disposed within the frame body  1  to solve the problems described above. 
     With reference to  FIGS. 3 to 5 , the frame body  1  provided by an embodiment of the present application includes a first bracket  11 , a second bracket  12 , and a block  13 . 
     The first bracket  11  possesses a first mold chamber  111 . Optionally, the first bracket  11  is an extruded profile, which can improve the structural strength of the first bracket  11  while reducing the weight of the first bracket  11  at the same time. 
     The second bracket  12  possesses a second mold chamber  121 . Optionally, the second bracket  12  is an extruded profile, which can improve the structural strength of the second bracket  12  while reducing the weight of the second bracket  12  at the same time. A plurality of second brackets  12  and a plurality of first brackets  11  are connected end to end in sequence to form a receiving cavity O. 
     The block  13  includes a first reinforcement portion  131  and a second reinforcement portion  132 , the first reinforcement portion  131  is received in the first mold chamber  111 , the second reinforcement portion  132  is received in the second mold chamber  121 , and the block  13  is used to connect the first bracket  11  with the second bracket  12 . 
     Since the battery pack  20  is subjected to vibration and impact during operations, stress is relatively concentrated at the connecting portion between the first bracket  11  and the second bracket  12  of the frame body  1 , thereby causing a risk of failure. The block  13  is integrally connected the first bracket  11  with the second bracket  12  and thus makes the block  13  the main object for bearing loads, thereby reducing the stress concentration at the connecting portion and improving the connection strength and rigidity of the frame body  1 . 
     Optionally, the block  13  is a hollow double-layered structure, improving the structural strength and rigidity of the block  13 . In addition, through the simulation calculation and analysis results, a side, for example, a connecting portion between two ends of the first bracket  11  located on the left and the second bracket  12  in  FIG. 3 , of the frame body  1  connected with the vehicle body is vulnerable to failure. Therefore, in order to save costs, in the first brackets  11  and the second brackets  12  connected end to end in sequence, the block  13  may be only disposed between the first brackets  11  and the second brackets  12  of the frame body  1  that are vulnerable to failure. 
     Regarding the frame body  1  provided by the embodiments of the present application, the connection strength and rigidity of the frame body  1  are improved by disposing the block  13  at the connecting portion between the first brackets  11  and the second brackets  12 . 
     The specific structure of the frame body  1  provided by the embodiments of the present application will be further described below in conjunction with the drawings. 
     With reference to  FIGS. 4 and 5 , the first bracket  11  possesses a first end  110  close to the second bracket  12 , and the first reinforcement portion  131  of the block  13  is received in the first mold chamber  111  at the first end  110 . The second bracket  12  includes a second end  120  close to the first bracket  11 , and the second reinforcement portion  132  of the block  13  is to received in the second mold chamber  121  at the second end  120 . Since the block  13  is received in the end portion of the first bracket  11  and the end portion of the second bracket  12  respectively, the weight of the frame body  1  is reduced while improving the connection strength and rigidity of the frame body  1 , thereby increasing the energy density of the lower housing  10  including the frame body  1 . 
     Optionally, as shown in  FIG. 5 , the block  13  is an extruded profile, there are 3 cavities disposed within the first reinforcement portion  131 , and an inwardly recessing cavity is disposed inside the second reinforcement portion  132 , thereby reducing the weight of the block  13  while improving the structural strength of the block  13 . 
     As shown in  FIG. 4 , the first reinforcement portion  131  of the block  13  is provided with a first positioning portion a, the second reinforcement portion  132  is provided with a second positioning portion b, the first positioning portion a is connected with the first end  110  of the first bracket  11  by a fastener, the second positioning portion b is connected with the second end  120  of the second bracket  12 , and the connection can be realized specifically by fastener, welding, among others. 
     In some embodiments, the first positioning portion a and the second positioning portion b are both through holes, the first positioning portion a is connected with the first end  110  of the first bracket  11  through a rivet, and the second positioning portion b is connected with the second end  120  of the second bracket  12  through a rivet. As shown in  FIG. 5 , an inner wall of the first reinforcement portion  131  facing the receiving cavity O is provided with the first positioning portion a, that is, the through hole, and since the thickness of the first reinforcement portion  131  is comparatively small, to reserve enough receiving space for the connecting member, an avoidance hole al is disposed on an outer wall of the first reinforcement portion  131  facing away from the receiving cavity O. Since the thickness of the second reinforcement portion  132  is relatively large and thus possessing enough receiving space, the second positioning portion b, that is, a through hole, is only disposed on an inner wall of the second reinforcement portion  132  facing the receiving cavity O. 
     In some embodiments, the first positioning portion a and the second positioning portion b are both threaded holes. The first positioning portion a is connected with the first end  110  of the first bracket  11  through a bolt, and the second positioning portion b is connected with the second end  120  of the second bracket  12  through a bolt. In the same way, the first positioning portion a, that is, a threaded hole, is disposed on the inner wall of the first reinforcement portion  131  facing the receiving cavity O, and an avoidance hole al is disposed on the outer wall of the first reinforcement portion  131  facing away from the receiving cavity O, and the second positioning portion b, that is, a threaded hole, is disposed on the inner wall of the second reinforcement portion  132  facing the receiving cavity O. 
     It can be understood that any one of the first positioning portion a and the second positioning portion b may be a through hole and connected with the end portion of the corresponding first bracket  11  or second bracket  12  through a rivet; and rest one of the positioning portion a and the second positioning portion b is a threaded hole and connected with the end portion of the corresponding second bracket  12  or first bracket  11  through a bolt, so that the first bracket  11  and the second bracket  12  are connected with each other via the block  13 . 
     Further, the side of the first reinforcement portion  131  and the second reinforcement portion  132  of the block  13  close to the receiving cavity O intersect with each other, and the side of the first reinforcement portion  131  and the second reinforcement portion  132  away from the receiving cavity O are connected through a inclined plane  132   a  or an arc surface  132 . The inclined plane  132   a  may ensure a smooth and transitional connection between the side of the first reinforcement portion  131  and the second reinforcement portion  132  away from the receiving cavity O. The arc surface  132   b  may ensure a smooth and transitional connection between the sides of the first reinforcement portion  131  and the second reinforcement portion  132  away from the receiving cavity O. 
     Optionally, the side of the first reinforcement portion  131  and the second reinforcement portion  132  away from the receiving cavity O may alternatively be connected through an inclined plane  132   a  and an arc surface  132   b . Either one of the inclined plane  132   a  or the arc surface  132   b  is connected with the side of the first reinforcement portion  131  away from the receiving cavity O, and the rest one of the inclined plane  132   a  and the arc surface  132   b  is connected with the side of the second reinforcement portion  132  away from the receiving cavity O. 
     As shown in  FIG. 4 , the inclined plane  132   a  is connected with the side of the first reinforcement portion  131  away from the receiving cavity O, and the arc surface  132   b  is connected with the side of the second reinforcement portion  132  away from the receiving cavity O. The connecting portion of the inclined plane  132   a  and the arc surface  132   b  are disposed tangentially. 
     Optionally, the side of the first reinforcement portion  131  and the second reinforcement portion  132  close to the receiving cavity O are disposed at a right angle, thereby ensuring no dead angle in the welding between an edge of the first bracket  11  and an edge of the second bracket  12 , improving the sealing performance of the welding seam. After the first reinforcement portion  131  of the block  13  is received in the first mold chamber  111  of the first bracket  11  and the second reinforcement portion  132  is received in the second mold chamber  121  of the second bracket  12 , the inclined plane  132   a  and/or the arc surface  132   b  disposed on the side of the first reinforcement portion  131  and the second reinforcement portion  132  away from the receiving cavity O can prevent corners of the frame body  1  from scratching the operator or other objects and improve the aesthetics of the frame body  1  as well. 
     Further, the first bracket  11  includes a first inner wall  11   a  close to the receiving cavity O and a first outer wall  11   b  away from the receiving cavity O, an installation hole  116  is disposed on the first outer wall  11   b , and the frame body  1  is connected with the external apparatus through the installation hole  116 . For example, the battery pack  20  is fixed onto the vehicle body by the frame body  1  via a bolt passing through the installation hole  116 . 
     A first separation wall  112  is disposed inside the first bracket  11  and divides the internal space of the first bracket  11  into at least two cavities, wherein a wall portion forming the first mold chamber  111  includes at least a part of the first inner wall  11   a.    
     Since the frame body  1  is connected with the external apparatus through the installation hole  116  on the first bracket  11 , impurities, liquid, or the like may easily enter the installation hole  116  during vibration, shaking, or the like when the first bracket  11  bears the load. However, due to the isolation effect of the first separation wall  112 , external impurities, liquid, or the like cannot enter the receiving cavity O through the first mold chamber  111  or thus affect the electrical performance of the battery pack  10 . Thereby, the first separation wall  112  can not only reduce the weight of the first bracket  11  and increase the rigidity and strength of the first bracket  11 , but also improve the sealing and protection performance of the frame body  1 . 
     As shown in  FIG. 5 , optionally, the cross-section of the first separation wall  112  is provided in a cross shape, and the first separation wall  112  divides the internal space of the first bracket  11  into four cavities distributed in rows and columns: the first mold chamber  111 , the third mold chamber  113 , the fourth mold chamber  114  and the fifth mold chamber  115 , wherein the first inner wall  11   a  corresponds to the first mold chamber  111  and the fourth mold chamber  114 , and the first outer wall  11   b  corresponds to the third mold chamber  113  and the fifth mold chamber  115 . The first reinforcement portion  131  of the block  13  is received in the first mold chamber  111 . The volumes of the four cavities can be the same or different. 
     As described above, since the installation hole  116  bears the load, external impurities, liquid, or the like may easily enter the third mold chamber  113  or the fifth mold chamber  115  through the installation hole  116 . However, due to the isolation effect of the first separation wall  112 , external impurities, liquid, or the like cannot enter the receiving cavity O through the first mold chamber  111  or the fourth mold chamber  114  or thus affect the electrical performance of the battery pack  10 . 
     Further, a second separation wall  122  is disposed within the second bracket  12  dividing the internal space of the second bracket  12  into at least two cavities, the second bracket  12  includes a second inner wall  12   a  close to the receiving cavity O and a second outer wall  12   b  away from the receiving cavity O, wherein a wall portion forming the second mold chamber  121  includes at least a part of the second inner wall  12   a.    
     As shown in  FIG. 5 , optionally, the cross-section of the second separation wall  122  is provided in an L shape, the second separation wall  122  divides the internal space of the second bracket  12  into a second mold chamber  121  and a sixth mold chamber  124 , the second mold chamber  121  is disposed close to the receiving cavity O, and the sixth mold chamber  124  is disposed away from the receiving cavity O. Due to the isolating effect of the second separation wall  122 , external impurities, liquid, or the like cannot enter the receiving cavity O through the second mold chamber  121  or thus affect the electrical performance of the battery pack  10 , and the second separation wall  122  can not only reduce the weight of the second bracket  12  and improve the rigidity and strength of the second bracket  12 , but also improve the sealing and protection performance of the frame body  1 . 
     Further, an engaging portion between the first end  110  of the first bracket  11  and the second end  120  of the second bracket  12  is connected with the block  13 . Specifically, the engaging portion between the first end  110  of the first bracket  11  and the second end  120  of the second bracket  12  is connected with the block  13  through welding to form a first welding seam  51 . The welding quality is high, thereby improving the connection performance of the first bracket  11  and the second bracket  12  and ensuring the connection strength. With reference to  FIG. 6 , in order to prevent dust and water vapor from entering the battery pack and causing damage to the battery cells and units and further improve the sealing and protection performance of the frame body  1 , the frame body  1  provided in an embodiment of the present application further includes a sealing plate  14 , a region between an edge of the first end  110  of the first bracket  11  and an edge of the second end  120  of the second bracket  12  is hermetically connected with the sealing plate  14 . 
     Specifically, the region between the edge of the first end  110  of the first bracket  11  and the edge of the second end  120  of the second bracket  12  is connected with the sealing plate  14  through welding to form a second welding seam S 2 . The requirement on the welding quality of the second welding seam S 2  is relatively high, thereby not only improving the connection performance of the sealing plate with the first bracket  11  and the second bracket  12 , but also further improving the sealing performance of the frame body  1 . 
     Since the block  13  can be connected respectively with the first bracket  11  and the second bracket  12  through riveting or screw connection, an edge of the block  13  does not need to be connected with the first bracket  11  or the second bracket  12  through welding. Therefore, only an initial welding is performed between the sealing plate  14  and the edges of the first end  110  of the first bracket  11  and the second end  120  of the second bracket  12 , avoiding a risk of welding penetration due to a secondary welding problem of the first bracket  11  and the second bracket  12 , thereby improving the yield rate. 
     In order to guarantee the sealing property of the frame body  1 , air tightness test needs to be performed on the first bracket  11 , the second bracket  12 , and the sealing plate  14  after their completion of welding. As described above, since the first separation wall  112  is disposed within the first bracket  11 , external impurities, liquid, or the like cannot enter the receiving cavity O through the first mold chamber  111  or thus affect the electrical performance of the battery pack  10 , and thus it is not necessary to seal the region between the outer wall  11   b  and the first separation wall  112 . However, the region between the first separation wall  112  and the second outer wall  12   b  is in communication with both of the first mold chamber  111  and the second mold chamber  121  having a necessity of satisfying the requirement on sealing. 
     Since the regions of the frame body  1  that need be sealed and the regions of the frame body  1  that do not need to be sealed are both sealed through the sealing plate  14 , if the air tightness detection on the frame body  1  is in failure, the specific location of the air leakage cannot be determined. In addition, when under rework, it is necessary to cut off the welded sealing plate  14  first and then re-welding a spare sealing plate  14  to the first bracket  11  and the second bracket  12 , thereby severely affecting the appearance of the frame body  1  and the quality of the welding seams. 
     Since it is not necessary to seal the region between the first outer wall  11   b  and the first separation wall  112  (that is, the third mold chamber  113  and the fifth mold chamber  115  in  FIG. 5 ), the requirement on the quality of the welding seam can be lowed; however, the region between the first separation wall  112  and the second outer wall  12   b  needs to satisfy the requirement on sealing in order to ensure that the battery cells and electrical elements are isolated from external dust and water vapor, thus causing the requirement on the quality of the welding seam is relatively high. Thereby, the sealing plate  14  can be divided into two parts, and the air tightness test only needs to be performed on a region required to be sealed after the welding. 
     With reference to  FIGS. 7 and 8 , the sealing plate  14  includes a first sealing plate section  141  and a second sealing plate section  142 , a region between the first outer wall  11   b  and the first separation wall  112  is connected with the first sealing plate section  141 , and a region between the first separation wall  112  and the second outer wall  12   b  is hermetically connected with the second sealing plate section  142 . 
     Specifically, the requirement on the welding quality of a third welding seam S 3 , which is formed by welding a region between the first outer wall  11   b  and the first separation wall  112  to the first sealing plate section  141 , is relatively low, and the requirement on polishing the stacking welding material of a sealing surface and an assembly surface is relatively low, thereby facilitating the manual control and improving the welding efficiency. However, the requirement on the welding quality of a fourth welding seam S 4 , which is formed by welding a region between the first separation wall  112  and the second outer wall  12   b  to the second sealing plate section  142 , is relatively high, and it is only necessary to invest a lot of cost to polish the stacking welding material of the sealing surface and the assembly surface when the fourth welding seam S 4  is welded. 
     When the air tightness test is performed on the frame body  1 , only the welding quality of the fourth welding seam S 4  is needed to be tested, and the leakage amount is generally required to be less than 0.04 Kpa. If there is an abnormality, the leakage point may be observed by applying soapy water to facilitate locating the air leakage which could be then directly repaired by welding without cutting off the sealing plate  14 , thereby reducing the complexity of the process, improving the manufacturability of the frame body  1 , and increasing the product qualification rate and production efficiency. 
     An embodiment of the present application proposes a frame body including a first bracket having a first mold chamber; a second bracket connected with the first bracket end to end to form a receiving cavity, the second bracket including a second mold chamber; and a block including a first reinforcement portion and a second reinforcement portion, wherein the first reinforcement portion is received in the first mold chamber, the second reinforcement portion is received in the second mold chamber, and the block is used to connect the first bracket with the second bracket. 
     In some embodiments, the first bracket includes a first end close to the second bracket, and the first reinforcement portion is received in the first mold chamber of the first end; and the second bracket includes a second end close to the first bracket, and the second reinforcement portion is received in the second mold chamber of the second end. 
     In some embodiments, the first reinforcement portion is provided with a first positioning portion, the second reinforcement portion is provided with a second positioning portion, the first positioning portion is connected with the first end of the first bracket, and the second positioning portion is connected with the second end of the second bracket. 
     In some embodiments, sides facing the receiving cavity of the first reinforcement portion and the second reinforcement portion are provided intersecting with each other, and sides away from the receiving cavity of the first positioning portion and the second positioning portion are connected through an inclined plane and/or an arc surface. 
     In some embodiments, the first bracket includes a first inner wall close to the receiving cavity and a first outer wall away from the receiving cavity, an installation hole is disposed on the first outer wall, and the frame body is connected with an external apparatus through the installation hole. 
     In some embodiments, a first separation wall is disposed in the first bracket, and the first separation wall divides an internal space of the first bracket into at least two cavities, wherein the wall portion forming the first mold cavity includes at least a part of the first inner wall. 
     In some embodiments, a second separation wall is disposed in the second bracket, and the second separation wall divides an internal space of the second bracket into at least two cavities, wherein the wall portion forming the second mold chamber includes at least a part of the second inner wall. 
     In some embodiments, an engaging portion between the first end of the first bracket and the second end of the second bracket is connected with the block. 
     In some embodiments, the frame body further includes a sealing plate, and a region between an edge of the first end of the first bracket and an edge of the second end of the second bracket is hermetically connected with the sealing plate. 
     In some embodiments, the sealing plate includes a second sealing plate section, and a region between the first separation wall and the second outer wall is hermetically connected with the second sealing plate section. 
       FIG. 9  is a schematic view of an exploded structure of a battery pack disclosed by another embodiment of the present application. In this embodiment, the upper housing  2  is realized as a first component  111 , and the lower housing  10  is realized as the second component  112 .  FIG. 10  is an installation diagram of the second component and the battery pack in  FIG. 9 . 
     The housing of the battery pack  20  in another embodiment of the present application may further have other shapes. For example, as shown in  FIG. 9 , the housing may include two parts, which are referred to herein as a first component  111  and a second component  112  (or may also be referred to as an upper housing and a lower housing), and the first component  111  and the second component  112  are buckled and engaged together. The shapes of the first component  111  and the second component  112  may be determined according to the combined shape of a plurality of battery cells  3 , and at least one of the first component  111  and the second component  112  includes an opening. For example, only one of the first component  111  and the second component  112  included by the housing may be a hollow cuboid having an opening, and the other one may be in a plate shape to cover and enclose the opening. For example, as shown in  FIGS. 9 and 10 , a case in which the second component  112  as a hollow cuboid and only one surface of it has an opening and the first component  111  in a plate shape is taken as an example herein, the first component  111  covers and encloses the opening of the second component  112  to form a housing having an enclosed chamber, which can be used to receive a plurality of battery cells  3 . 
       FIG. 11  is a schematic view of a second component disclosed by another embodiment of the present application,  FIG. 12  is a schematic top view of a structure of the second component in  FIG. 11 , and  FIG. 13  is a partial exploded view of the second component shown in  FIG. 12 , and  FIG. 14  is a partial enlarged view of a region A in  FIG. 13 . In this embodiment, the frame body  1  is realized as a plurality of walls, the first bracket  11  is realized as a first wall  210 , the second bracket  12  is realized as a second wall  220 , the block  13  is realized as a reinforcement structure  230 , the first reinforcement portion  131  is realized as a first part  231 , and the second reinforcement portion  132  is realized as a second part  232 . 
     As shown in  FIGS. 11 to 14 , the second component  112  includes a plurality of walls, which may form a receiving cavity. In the drawings, taking a case in which the second component  112  as a hollow cuboid as an example, said plurality of walls of the second component  112  are four side walls. In addition, the second component  112  further includes a bottom plate  4 , and the bottom plate and the four side walls form the second component  112 .  FIG. 15  is a partial cross-sectional view of an upper left corner region in  FIG. 12 . The cross-sectional view is obtained by cutting a middle position of the housing along a plane parallel to the bottom plate  4  of the housing. 
     For convenience of description, herein, the description is made by taking any two intersecting walls included by the second component  112  as an example, and they are referred to as the first wall  210  and the second wall  220  respectively. As shown in  FIGS. 11 to 15 , if the second component  112  is a cuboid, the first wall  210  and the second wall  220  are perpendicular to each other. On the contrary, if the second component  112  is in a shape of another type of polygons, the first wall  210  and the second wall  220  may also have other positional relationships, which are not limited in the embodiments of the present application. 
     For convenience of description, the present application is described by taking a case in which the first wall  210  and the second wall  220  shown in  FIGS. 11 to 15  are perpendicular to each other as an example, and an extension direction of the first wall  210  or a length direction of the first wall  210  is defined as a second direction, which is denoted as Y; an extension direction of the second wall  210  or a length direction of the second wall  210  is defined as a first direction, which is denoted as X; and a height direction of the first wall  210  or a height direction of the second wall  220  is defined as a third direction, which is denoted as Z. Also, in a case where the second component  112  is a cuboid, the three directions X, Y, and Z are perpendicular to one another. 
     As shown in  FIGS. 11 to 15 , the second component  112  further includes a reinforcement structure  230 , which includes a first part  231  and a second part  232  connected with each other. Specifically, the first wall  210  includes a first mold chamber therein, and the second wall  220  includes a second mold chamber therein, the first part  231  of the reinforcement structure  230  is received in the first mold chamber of the first wall  210  and fixed to the first wall  210 , and the second part  232  of the reinforcement structure  230  is received in the second mold chamber of the second wall  220  and fixed to the second wall  220 , thereby realizing the fixing of the first wall  210  to the second wall  220 . 
     As shown in  FIGS. 11 to 15 , the first wall  210  of an embodiment of the present application includes two side walls arranged along the first direction X and a first outer top wall  211 , wherein the two sides walls of the first wall  210  are a first outer side wall  212  and a first internal portion wall  213  respectively, the first outer side wall  212  is an outer wall of the frame body  1 , the first internal portion wall  213  is an inner wall of the frame body  1 , and the first outer top wall  211  is the outer wall for connecting the two side walls of the first wall  210  and the outermost wall of the first wall  210  along the third direction Z. Similarly, the second wall  220  of an embodiment of the present application includes two side walls arranged along the second direction Y and a second outer top wall  221 , wherein the two side walls of the second wall  220  are a second outer side wall  222  and a second internal portion wall  223  respectively, the second outer side wall  222  is an outer wall of the frame body  1 , the second internal portion wall  223  is an inner wall of the frame body  1 , and the second outer top wall  221  is the outer wall for connecting the two side walls  222  and  223  of the second wall  220  and the outermost wall of the second wall  220  along the third direction Z. 
     In an embodiment of the present application, as shown in  FIGS. 11 to 15 , the first outer top wall  211  is welded to the second outer top wall  221 , and an end portion in a welding line of the first outer top wall  211  and the second outer top wall  221  close to the inner portion of the frame body  1  is defined as a first line segment L 11 ; and an outer surface of the reinforcement structure  230  includes a first region  233 , and an orthographic projection of the first line segment L 11  on a plane where the first region  233  is located falls within the first region  233 . That is, the reinforcement structure  230  is closer to the inner portion of the frame body  1  than the welding line L 1 . 
     Therefore, the frame body  1  of the second component  112  of an embodiment of the present application includes a plurality of walls, the reinforcement structure  230  may be disposed between any arbitrarily intersecting first wall  210  and second wall  220 , the reinforcement structure  230  can be disposed in the cavities of the first wall  210  and the second wall  220  to connect and fix the first wall  210  and the second wall  220 , thereby greatly increasing the rigidity and strength between first wall  210  and the second wall  220  and reducing the stress between the first wall  210  and the second wall  220  without occupying the internal space of the frame body  1 . In addition, the first outer top wall  211  of the first wall  210  and the second outer top wall  221  of the second wall  220  are welded, and for the first line segment L 11  of the end portion of the welding seam close to the inner portion of the second component  112 , the reinforcement structure  230  has such a first region  233  thereon that the orthographic projection of the first line segment L 11  on the plane where the first region  233  is located falls within the first region  233 , thus when the frame body  1  is subjected to an expansion force of the battery cell  3  or other forces from the inner portion of the frame body  1  towards the outside, these forces will first act on the reinforcement structure  230 , thereby reducing the force applied on the first line segment L 11  and solving the problem that the wall of the frame body  1  is prone to failure under the action of the expansion force or other forces from the inner part of the frame body  1  towards the outside due to the low strength of the welding seam. 
     The embodiments of the present application will be described in detail in conjunction with the drawings below. 
     In an embodiment of the present application, the first wall  210  may be any one wall in the frame body  1 , and thus the description is mainly made by taking the first wall  210  as an example as below.  FIG. 16  is a schematic cross-sectional view of the first wall of an embodiment of the present application. As shown in  FIGS. 14 to 16 , the outer wall of the first wall  210  includes a first internal portion wall  213 , a first outer side wall  212 , and a first outer top wall  211 , the first wall  210  further includes a first connecting wall  2123  therein, the first connecting wall  2123  is used to connect at least two walls of the first internal portion wall  213 , the first outer side wall  212 , and the first outer top wall  211 , and the position and shape of the first connecting wall  2123  are appropriately disposed, a plurality of cavities can be formed inside the first wall  210 , for example, the first connecting wall  2123  provided in the drawings forms the cavities  214  to  219  of the first wall  210 . 
     Specifically, as shown in  FIGS. 14 to 16 , the thickness of the first wall  210  along the first direction X may be uniform or non-uniform, that is to say, the first internal portion wall  213  or the first outer side wall  212  may be even or uneven. For example, the surface of the first internal portion wall  213  or the first outer side wall  212  may include recessed regions or raised regions. Optionally, in the drawings, a case in which the surface of the first internal portion wall  213  is uneven while the surface of the first outer side wall  212  is even is taken as an example, and there may alternatively be differences between different walls of the frame body  1 , for example, in the drawings, the surface of the first internal portion wall  213  of the first wall  210  is uneven while the surface of the second internal portion wall  223  of the second wall  220  is even, and the embodiments of the present application are not limited thereto. 
     Optionally, the inner and outer side walls of the same wall of the frame body  1  may be parallel or non-parallel, for example, the first internal portion wall  213  and the first outer side wall  212  may be parallel or non-parallel. Also, considering that the surface of each wall of the frame body  1  may have uneven regions, local regions of the inner and outer side walls of the same wall may be parallel or non-parallel. For convenience of description, the description is made mainly by taking a case in which the first internal portion wall  213  and the first outer side wall  212  are parallel or approximately parallel as an example, but the embodiments of the present application are not limited thereto. 
     In an embodiment of the present application, the walls inside each wall can be disposed according to actual applications, and different walls can also be disposed to be the same or different. For example, the first connecting wall  2123  inside the first wall  210  can be disposed according to actual applications. For example, the first connecting wall  2123  may include a wall perpendicular to the first internal portion wall  213  and the first outer side wall  212 , or may further include a wall parallel to the first internal portion wall  213  and the first outer side wall  212 , or may further include a wall inclined relatively to the first internal portion wall  213  and the first outer side wall  212  to form a plurality of cavities  214  to  219  located at different positions. 
     Correspondingly, in an embodiment of the present application, the cavities included by different walls may also be the same or different. For example, corresponding to the distribution of the first connecting wall  2123 , the numbers, dimensions, and shapes of a plurality of cavities  214  to  219  of the first wall  210  can also be set according to practical situations. For example, the shapes and the dimensions of a plurality of cavities  214  to  219  may be the same or different, and in the drawings, a case in which the shapes of the plurality of cavities  214  to  219  are the same while the dimensions are different is taken as an example, and the axes of the cavities are parallel to each other, but the embodiments of the present application are not limited thereto. 
     In order to facilitate processing, in an embodiment of the present application, the first internal portion wall  213 , the first outer side wall  212 , the first outer top wall  211 , and the first connecting wall  2123  included by the first wall  210  may be formed as an integral structure, or at least two of the first internal portion wall  213 , the first outer side wall  212 , the first outer top wall  211 , and the first connecting wall  2123  are formed as an integral structure, but the embodiments of the present application are not limited thereto. 
     Optionally, as shown in  FIGS. 14 to 16 , the first wall  210  may further include a first hollow cavity, and the first hollow cavity and the first mold chamber are arranged along the first direction X. For example, the first wall  210  in the drawings includes the first mold chamber  2121  and the first hollow cavity  2131 , wherein a column of first hollow cavity  2131  close to the inner portion of the frame body  1  may include two first cavities  215  and  217 , while a column of first mold chamber  2121  close to the outside of the frame body  1  may include two first mold chambers  216  and  218 . Similarly, the second wall  220  may further include a second hollow cavity, and the second hollow cavity and the second mold chamber are arranged along the second direction Y. The column of second hollow cavity may include at least one second hollow cavity, and the column of second mold chamber may include at least one second mold chamber, for example, a column of second mold chamber  2221  and a column of second hollow cavity  2231  in the drawings. 
     In an embodiment of the present application, the reinforcement structure  230  may be located in at least one column of first hollow cavity, and similarly, the reinforcement structure  230  may also be located in at least one column of second mold chamber. For example, an embodiment of the present application mainly takes  FIGS. 14 to 16  as an example, and the first part  231  of the reinforcement structure  230  can be received in the column of first mold chamber  2121  close to the outside of the frame body  1 . Similarly, the second part  232  of the reinforcement structure  230  is received inside the column of second mold chamber  2221  close to the outside of the frame body  1 , but the embodiments of the present application are not limited thereto. 
     It should be understood that the frame body  1  of an embodiment of the present application may further include a first connecting member  241  and a second connecting member  242 , wherein the first connecting member  241  is used to fix the first part  231  to the first wall  210 , and the second connecting member  242  is used to fix the second part  232  to the second wall  220 . 
     Optionally, in an embodiment of the present application, the first connecting member  241  and the second connecting member  242  may be fasteners or expansion glue. As shown in  FIGS. 14 to 16 , the context is mainly described by taking the case, in which the first connecting member  241  and the second connecting member  242  are fasteners, as an example, the fastener may include a head and a connecting member, and may be a bolt, a screw, a rivet, or the like, but the embodiments of the present application are not limited thereto. 
     Optionally, the numbers and positions of the first connecting member  241  and the second connecting member  242  may be set according to practical situations, for example, the numbers and positions of the first connecting member  241  and the second connecting member  242  may be determined according to the positions and disposing way of the reinforcement structure  230 . 
     Specifically, the first part  231  of the reinforcement structure  230  may include a plurality of first reinforcement blocks, and correspondingly, the first wall  210  may include one or more first mold chambers, each of said plurality of first reinforcement blocks is received in a corresponding first mold chamber, while one first hollow cavity may include one or more first reinforcement blocks therein. For example, as shown in  FIGS. 14 to 16 , the first part  231  may include four first reinforcement blocks  2311 , which are arranged along the third direction Z and correspond to the  4  first mold chambers  214 ,  216 ,  218 , and  219  of said plurality of cavities  214  to  219  included by the first wall  210  respectively. 
     Similarly, the second part  232  of the reinforcement structure  230  may further include a plurality of second reinforcement blocks, and correspondingly, the second wall  220  may include one or more second mold chambers, each of said plurality of second reinforcement blocks is received in a corresponding second mold chamber, while one second mold chamber may include one or more second reinforcement blocks. For example, as shown in  FIGS. 14 to 16 , the second part  232  may include four second reinforcement blocks  2321 , which are arranged along the third direction Z and correspond to the four second mold chamber of the second wall  220  respectively. 
     Optionally, as shown in  FIGS. 14 to 16 , in a case where the axes of a plurality of first mold chambers included by the first wall  210  are parallel to each other, the axes of said plurality of first reinforcement blocks  2311  are also parallel to each other. In a case where the axes of said plurality of second mold chambers included by the second wall  220  are parallel to each other, the axes of said plurality of second reinforcement blocks  2321  are also parallel to each other. 
     Optionally, the dimensions and shapes of a plurality of first reinforcement blocks  2311  may be adapted to a plurality of first mold chambers, and the dimensions and shapes of said plurality of second reinforcement blocks  2321  may be adapted to said plurality of second mold chambers; and in addition, the lengths of said plurality of first reinforcement blocks  2311  along the second direction Y may be the same or different, and the lengths of said plurality of second reinforcement blocks  2321  along the first direction X may also be the same or different. For example, as shown in  FIGS. 14 to 16 , the shapes of the  4  first reinforcement blocks  2311  may also be the same, but the lengths along the second direction Y are different, and the shapes of the four second reinforcement blocks  2321  can alternatively be the same, but the lengths along the second direction Y are different. 
     It should be understood that regarding the disposing ways of a plurality of first reinforcement blocks  2311  and a plurality of second reinforcement blocks  2321  as shown in  FIGS. 14 to 16 , in a case where the first part  231  is received in the column of first mold chamber  2121  close to the outside of the frame body  1 , the head of the first connecting member  241  may be located in the column of first hollow cavity  2131  close to the inner portion of the frame body  1 . Similarly, in a case where the second part  232  is received in the column of second mold chamber  2221  close to the outside of the frame body  1 , the head of the second connecting member  242  may be located in the column of second hollow cavity  2231  close to the inner portion of the frame body  1 . 
     In addition, the numbers of the first connecting member  241  and the second connecting member  242  can be set according to practical situations. For example, the first connecting member  241  may be disposed on at least one first reinforcement block  2311 , wherein one or more first connecting members  241  are disposed on one first reinforcement block  2311 , and the numbers of the first connecting members  241  on different first reinforcement blocks  2311  may be the same or different, so that the first part  231  is fixed to the first wall  210 . Similarly, the second connecting member  242  may be disposed on at least one second reinforcement block  2321 , wherein one or more second connecting members  242  are disposed on one second reinforcement block  2321 , and the numbers of the second connecting members  242  on the different second reinforcement blocks  2321  may be the same or different, so that the second part  232  is fixed to the second wall  220 . 
     For example, as shown in  FIGS. 14 to 16 , two first connecting members  241  arranged along the second direction Y may be disposed on the two first reinforcement blocks  2311  in the middle of the four first reinforcement blocks  2311  respectively, and two second connecting members  242  arranged along the first direction X are disposed on the two second reinforcement blocks  2321  in the middle of the four second reinforcement blocks  2321  respectively, but the embodiments of the present application are not limited thereto. 
     Regarding the distribution positions of one or more first connecting members  241  on any one first reinforcement block  2311 , a distance between a position of each of the one or more first connecting members  241  and the first end of the corresponding first reinforcement block accounts a length of one-sixth to one-half of the corresponding first reinforcement block in the second direction Y, and the first end is an end of the corresponding first reinforcement block away from the second wall  220 . Similarly, for the distribution positions of one or more second connecting members  242  on any one second reinforcement block  2321 , a distance between a position of each of the one or more second connecting members  242  and a second end of the corresponding second reinforcement block accounts a length of one-sixth to one-half of the corresponding second reinforcement block in the first direction X, and the second end is an end of the corresponding second reinforcement block away from the first wall  210 . 
     In addition, in a case where the plurality of first connecting members  241  are disposed on one first reinforcement block  2311 , the intervals between a plurality of first connecting members  241  may be the same or different, and similarly, in a case where said plurality of second connecting members  242  are provided on one second reinforcement block  2321 , the intervals between said plurality of second connecting members  242  may be the same or different. 
     Reasonably setting the positions and numbers of the first connecting member  241  and the second connecting member  242  can effectively improve the strength and the stability between the reinforcement structure  230  and the first wall  210  and between the reinforcement structure  230  and the second wall  220 , thereby reducing the risk of failure of the frame body  1 . 
     It should be understood that, as shown in  FIGS. 14 to 16 , the reinforcement structure  230  further includes a raised portion  234 , which protrudes from the intersecting portion of the first portion  231  and the second portion  232  towards the inner portion of the frame body  1 , and an outer surface of which includes a first region  233 , for example, the first region  233  may be located on the upper surface of the raised portion  234  along the third direction Z shown in  FIG. 14 , so that the orthographic projection of the first line segment L 11  in the welding line of the first outer top wall  211  and the second outer top wall  221  close to the inner portion of the frame body  1  on the plane where the first region  233  is located falls within the first region  233 , but the embodiments of the present application are not limited thereto. 
     Optionally, the position and height of the raised portion  234  along the third direction Z can be set according to practical situations. For example, the position of the raised portion  234  may be set according to the position of the first reinforcement block, the first part  231  of which is provided with the first connecting member  241 , and the position of the second reinforcement block, the second part  232  of which is provided with the second connecting member  242 . For example, as shown in  FIGS. 14 to 16 , in a case where the first connecting member  241  and the second connecting member  242  are each disposed on the two first reinforcement blocks  2311  and the two second reinforcement blocks  2321  which are in a middle position, the raised portion  234  may protrude towards the inner portion of the frame body  1  from the intersecting portions of the two first reinforcement blocks  2311  and the two second reinforcement blocks  2321  which are in a middle position. 
     It should be understood that, considering the disposing position of the raised portion  234 , a notch region may be disposed at the corresponding positions of the first wall  210  and the second wall  220  and used to avoid the raised portion  234 . For example, as shown in  FIGS. 14 to 16 , a first notch region  2132  may be disposed on the first internal portion wall  213  of the first wall  210 , a second notch region  2232  may be disposed on the second internal portion wall  223  of the second wall  220 , and the two notch regions are used to avoid the raised portion  234 . 
     Optionally, the heights of the first notch region  2132  and the second notch region  2232  in the third direction Z are greater than or equal to the height of the raised portion  234  in the third direction Z to avoid the raised portion  234 . The height of the first notch region  2132  in the third direction Z and the height of the second notch region  2232  in the third direction Z may be the same or different. For example, as shown in  FIGS. 14 to 16 , in the third direction Z, the second notch region  2232  may be located in a middle region of the second internal portion wall  223 , and the height of the second notch region  2232  in the third direction Z may be set to be equal to or slightly greater than the height of the raised portion  234  in the third direction Z; while the first notch region  2132  is located in the middle and lower region of the first internal portion wall  213  in the third direction Z, and the height of the first notch region  2132  in the third direction Z is significantly greater than the height of the raised portion  234  in the third direction Z. 
     In an embodiment of the present application, the raised portion  234  includes a first region  233  thereon, so that the orthographic projection of the first line segment L 11  in the welding line of the first outer top wall  211  and the second outer top wall  221  close to the inner portion of the frame body  1  on the plane where the first region  233  is located falls within the first region  233 . Specifically, the first outer top wall  211  and the second outer top wall  221  are fixed through welding, and since the thickness of the first wall  210  in the first direction X and the thickness of the second wall  220  in the second direction Y may be the same or different, the position of the welding line between the first outer top wall  211  and the second outer top wall  221  can be flexibly disposed according to practical applications. 
     For example,  FIGS. 17 and 18  respectively show schematic views of different fixing ways between the first outer top wall  211  of the first wall  210  and the second outer top wall  221  of the second wall  220 . As shown in  FIG. 10 , the thickness of the first wall  210  along the first direction X and the thickness of the second wall  220  along the second direction Y may be the same, so when the first outer top wall  211  of the first wall  210  and the second outer top wall  221  of the second wall  220  are welded to each other, a first edge  2111  on the first outer top wall  211  and a second edge  2211  on the second outer top wall  221  can be welded to form a welding line L 1 , and a section of the welding line L 1  close to the inner portion of the frame body  1  is defined as a first line segment L 11 , the length of which is smaller than that of the welding line L 1 . 
     Specifically, regarding the intersecting line of the first edge  2111  and the second edge  2211 , the length of the welding line L 1  may be less than or equal to that of the intersecting line. For example, considering the thickness of the first internal portion wall  213  and the second internal portion wall  223 , as shown in  FIG. 17 , an end of the intersecting line of the first edge  2111  and the second edge  2211  close to the inner portion of the frame body  1  may not be welded, and then the length of the welding line L 1  is smaller than that of the intersecting line of the first edge  2111  and the second edge  2211 . In this case, the position of the first line segment L 11  at the end of the welding line L 1  close to the inner portion of the frame body  1  is shown in  FIG. 17 , that is, in  FIG. 17 , a section on the intersecting line of the first edge  2111  and the second edge  2211  closer to the inner portion of the frame body  1  than the first line segment L 11  is not welded. 
     Optionally, as shown in  FIG. 18 , the thickness of the first wall  210  along the first direction X and the thickness of the second wall  220  along the second direction Y may be different, and herein the description is made by taking the case in which the thickness of the second wall  220  is greater than that of the first wall  210  as an example. When the first outer top wall  211  of the first wall  210  and the second outer top wall  221  of the second wall  220  are welded to each other, the first edge  2111  on the first outer top wall  211  and the second edge  2211  of the second outer top wall  221  can be welded alike to form the welding line L 1 , and a section in the welding line L 1  close to the inner portion of the frame body  1  is defined as the first line segment L 11 , the length of which is smaller than that of the welding line L 1 . At the same time, the start and end position for welding may be distinguished from the second edge  2211 , thereby ensuring that the projection of the first line segment L 11  at the end portion of the welding line L 1  along the third direction Z falls on the reinforcement structure  230 . 
     In addition, due to the difference in thicknesses, as shown in  FIG. 18 , there is a third edge  2112  connected with the first edge  2111  on the first outer top wall  211 , the third edge intersects a fourth edge  2212  on the second outer top wall  221  connected with the second edge  2211 , a line segment of the intersecting portion is defined as a second line segment L 2 , and the first line segment L 11  intersects non-collinearly with the second line segment L 2 , for example, the position relationship of the first line segment L 11  and the second line segment L 2  may be shown in  FIG. 18 , so that the first internal portion wall  213  and the second internal portion wall  223  can be abutted against each other to ensure the sealing performance of the first wall  210  and the second wall  220 . The second line segment L 2  is usually not welded, and the third edge  2112  and the fourth edge  2212  abut against each other, but the embodiments of the present application are not limited thereto. 
     It can be understood that the first wall  210  and the second wall  220  may have only one column of first mold chamber and one column of second mold chamber respectively, and the reinforcement structure  230  is formed as an L-shaped structure, the two parts of which are respectively received in the first mold chamber of the first wall  210  and the second mold chamber of the second wall  220 , respectively filling the first wall  210  along the first direction X and the second wall  220  along in the second direction Y. Alternatively, the first wall  210  and the second wall  220  possess multiple columns of first mold chambers and multiple columns of second mold chambers respectively, and the two parts of the reinforcement structure  230  are respectively received in multiple columns of first mold chambers of the first wall  210  and multiple columns of second mold chamber of the second wall  220 , respectively filling the multiple columns of first mold chambers of the first wall  210  along the first direction Z and filling the multiple columns of second mold chambers of the second wall  220  along the second direction Y. For the above situation, in this case, the projection of the welding start end of the first line segment L 11  on the reinforcement structure  230  in the height direction can still be located onto the reinforcement structure  230 . For example, it can still be located onto the surface of the reinforcement structure  230  facing the first outer top wall  211  or the second outer top wall  221 , thereby strengthening the connection between the first wall  210  and the second wall  220  alike and reducing a risk of failure of the welding seam between the first outer top wall  211  and the second outer top wall  221 . 
     Therefore, regarding the frame body of the battery of the embodiments of the present application, the reinforcement structure  230  is disposed in the intersecting first mold chamber of the first wall  210  and the second mold chamber of the second wall  220 , to connect and fix the first wall  210  and the second wall  220 , thereby greatly increasing the rigidity and strength between the first wall  210  and the second wall  220  and reducing the stress between the first wall  210  and the second wall  220  without occupying the internal space of the frame body  1 . In addition, the first outer top wall  211  of the first wall  210  and the second outer top wall  221  of the second wall  220  are welded, while regarding the first line segment L 11  at the end portion of the welding seam close to the inner portion of the frame body  1 , the reinforcement structure  230  includes such a first region  233  thereon that the orthographic projection of the first line segment L 11  on the plane where the first region  233  is located falls within the first region  233 , so that when the frame body  1  is subjected to an expansion force of the battery cell  3  or other forces from the inner portion of the frame body  1  to the outside, these forces will first act on the reinforcement structure  230 , thereby reducing the force applied on the first line segment L 11  and further solving the problem that the wall of the frame body  1  is prone to failure under the action of the expansion force or other forces from the inner portion of the frame body  1  to the outside due to the low strength of the welding seam. 
     The frame body, the battery pack, and the electrical device of the embodiments of the present application are described above, and the method and device for producing the frame body of the battery of the embodiments of the present application will be described below, wherein the parts that are not described in detail can refer to the individual foregoing embodiments. 
       FIG. 19  shows a schematic flowchart of a method for producing a frame body of a battery pack according to an embodiment of the present application. As shown in  FIG. 19 , the method  300  may include, S 310 , providing a plurality of first walls and a plurality of second walls to form a receiving cavity of the frame body, wherein a first mold chamber is included within the first wall, a second mold chamber is included within the second wall, the first wall includes a first outer top wall, the second wall includes a second outer top wall, the first outer top wall is welded to the second outer top wall, and an end portion in a welding line between the first outer top wall and the second outer top wall close to an inner portion of the frame body is defined as a first line segment; and, S 320 , providing a reinforcement structure, which includes a first part and a second part which are connected, the first part being received in the first mold chamber of the first wall and fixed to the first wall, and the second part being received in the second mold chamber of the second wall and fixed to the second wall, wherein an outer surface of the reinforcement structure includes a first region, and an orthographic projection of the first line segment on a plane where the first region is located falls within the first region. 
       FIG. 20  shows a schematic block view of a device for producing a frame body of a battery pack according to an embodiment of the present application. As shown in  FIG. 20 , the device may include a providing module  410 . The providing module  410  is used to provide a plurality of first walls and a plurality of second walls to form a receiving cavity of the frame body, a first mold chamber is included within the first wall, a second mold chamber is included within the second wall, the first wall includes a first outer top wall, the second wall includes a second outer top wall, the first outer top wall is welded to the second outer top wall, and an end portion of a welding line between the first outer top wall and the second outer top wall close to an inner portion of the frame body is defined as a first line segment; and to provide a reinforcement structure, which includes a first part and a second part which are connected, the first part is received in the first mold chamber of the first wall and fixed to the first wall, the second part is received in the second mold chamber and fixed to the second wall, wherein an outer surface of the reinforcement structure includes a first region, and an orthographic projection of the first line segment on a plane where the first region is located falls within the first region. 
     An embodiment of the present application provides a frame body including a plurality of walls to form a receiving space of the frame body, said plurality of walls including a first wall and a second wall which intersect, the first wall including a first mold chamber therein, the second wall including a second mold chamber therein, the first wall including a first outer top wall, the second wall including a second outer top wall, the first outer top wall being welded to the second outer top wall, and an end in the welding line between the outer top wall and the second outer top wall close to an inner portion of the frame body being defined as a first line segment; and a reinforcement structure including a first part and a second part, the first part being received in the first mold chamber and fixed to the first wall, and the second part being received in the second mold chamber and fixed to the second wall, wherein an outer surface of the reinforcement structure includes a first region, and an orthographic projection of the first line segment on a plane where the first region is located falls within the first region. 
     In some embodiments, the intersecting line of the first outer top wall and the second outer top wall further includes a second line segment, and the first line segment intersects non-collinearly with the second line segment. 
     In some embodiments, the first wall includes two side walls arranged along a first direction, the first outer top wall is an outer wall for connecting the two side walls of the first wall, the first wall further includes a first hollow cavity, and the first hollow cavity and the first mold chamber are arranged along the first direction; and the second wall includes two side walls arranged along a second direction, the second outer top wall is an outer wall for connecting the two side walls of the second wall, the second wall further includes a second hollow cavity, and the second hollow cavity and the second mold chamber are arranged along the second direction. 
     In some embodiments, the frame body further includes a first connecting member for fixing the first part to the first wall; and a second connecting member for fixing the second part to the second wall. 
     In some embodiments, the first connecting member includes a head and a connecting portion, the first mold chamber and the first hollow cavity each is arranged in a column, the first mold chamber is disposed close to an outer side of the frame body, the first hollow cavity is disposed close to an internal portion of the frame body, and the first hollow cavity is used to receive the head of the first connecting member; and the second connecting member includes a head and a connecting portion, the second mold chamber and the second hollow cavity are arranged in a column, the second mold chamber is disposed close to the outer side of the frame body, the second hollow cavity is disposed close to the internal portion of the frame body, and the second hollow cavity is used to receive the head of the second connecting member. 
     In some embodiments, the reinforcement structure includes a raised portion protruding from the intersecting portion of the first part and the second part towards the inner portion of the frame body, and an outer surface of the raised portion includes a first region. 
     In some embodiments, an internal portion wall in the two side walls of the first wall facing the inner portion of the frame body is provided with a first notch region, an internal portion wall in the two side walls of the second wall facing the inner portion of the frame body is provided with a second notch region, and the first notch region and the second notch region are all used to avoid the raised portion. 
     In some embodiments, the first part includes a plurality of first reinforcement blocks, the first wall includes a plurality of first mold chambers, and each of said plurality of first reinforcement blocks is received in a corresponding one of the plurality of first mold chambers; and the second part includes a plurality of second reinforcement blocks, the second wall includes a plurality of second mold chambers, and each of said plurality of second reinforcement blocks is received in a corresponding one of the plurality of second mold chambers. 
     In some embodiments, a plurality of first reinforcement blocks are arranged along a third direction, a plurality of second reinforcement blocks are arranged along the third direction, and the third direction is a height direction of the first wall. 
     In some embodiments, the first connecting member is used to fix at least one of a plurality of first reinforcement blocks to the first wall; and the second connecting member is used to fix at least one of a plurality of second reinforcement blocks to the second wall. 
     In some embodiments, the raised portion protrudes from an intersecting portion of the at least one first reinforcement block and the at least one second reinforcement block towards the inner portion of the frame body. 
     In some embodiments, a plurality of first connecting members are disposed on at least one first reinforcement block; and a plurality of second connecting members is disposed on at least one second reinforcement block. 
     In some embodiments, the plurality of first connecting members are arranged along a second direction, a distance between a position of each of said plurality of first connecting members and a first end of the corresponding first reinforcement block accounts a length of one-sixth to one-half of the corresponding first reinforcement block in the second direction, and the first end is an end of the corresponding first reinforcement block away from the second wall; and a plurality of second connecting members are arranged along a first direction, a distance between a position of each of said plurality of second connecting members and a second end of the corresponding second reinforcement block accounts a length of one-sixth to one-half of the corresponding second reinforcement block in the first direction, and the second end is an end of the corresponding second reinforcement block away from the first wall. 
     In addition, an embodiment of the present application also provides an electrical apparatus including the battery pack described according to any one of the embodiments described above. 
     In addition, an embodiment of the present application further provides a method for producing a frame body of a battery, and the method includes providing a plurality of walls to form a receiving cavity of the frame body, said plurality of walls including a first wall and a second wall which are intersected, the first wall including a first mold chamber, the second wall including a second mold chamber therein, the first wall including a first outer top wall, the second wall including a second outer top wall, the first outer top wall being welded to the second outer top wall, and an end portion in a welding line between the first outer top wall and the second outer top wall close to an inner portion of the frame body being defined as a first line segment; and providing a reinforcement structure, the reinforcement structure including a first part and a second part which are connected, the first part being received in the first mold chamber and fixed to the first wall, and the second part being received in the second mold chamber and fixed to the second wall, wherein an outer surface of the reinforcement structure includes a first region, and an orthographic projection of the first line segment on a plane where the first region is located falls within the first region. 
     In addition, an embodiment of the present application further provides a device for producing a frame body of a battery, and the device includes a module for executing the above methods. 
     Although the present application has been described with reference to the preferred embodiments, various improvements can be made to it and the components therein can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, various technical features mentioned in the various embodiments can be combined in any ways. The present application is not limited to the specific embodiments disclosed in the context, but includes all technical solutions falling within the scope of the claims.