PLASTIC COMPONENT, BATTERY, BATTERY MODULE, AND ELECTRIC DEVICE

Provided are a plastic component, a battery, a battery module, and an electric device. The plastic component (10) satisfying at least one of condition 1): 1 mm≤c−e≤1 mm and 1 mm≤c−f≤2 mm, where c is a thickness of the body, f is a depth of the buffer recess (11), e is a depth of the connection piece recess (21); and condition 2): 1 mm≤p≤2 mm, p=(a−t*g−r*d)/n, where g is a length of the connection piece recess (21), t is a number of the connection piece recesses (21), r is a number of the buffer recesses (11), d is a length of the buffer recess (11), a is a length of the body, and p is a thickness of each of n side walls arranged in a length direction of the body.

FIELD

The present disclosure relates to the field of battery technologies, and in particular, to a plastic component, a battery, a battery module, and an electric device.

BACKGROUND

At present, for a large-size plastic component structure, a strength of the plastic component is often enhanced by increasing its thickness. However, increasing the thickness of the plastic component necessitates a greater quantity of plastic component materials, thereby resulting in escalated production costs.

SUMMARY

The present disclosure provides a plastic component, a battery, a battery module, and an electric device.

The plastic component according to embodiments of the present disclosure includes a body having a first side surface and a second side surface facing away from the first side surface. The first side surface has a buffer recess recessed towards the second side surface, the buffer recess has at least one flow guide hole penetrating the body in a thickness direction of the body, the second side surface has a connection piece recess recessed towards the first side surface, and the connection piece recess has a pole through hole penetrating the body in the thickness direction of the body. The plastic component satisfies at least one of: condition 1): 1 mm≤c−e≤2 mm and 1 mm≤c−f≤2 mm, where c is a thickness of the body, f is a depth of the buffer recess, e is a depth of the connection piece recess; and condition 2): 1 mm≤p≤2 mm, p=(a−t*g−r*d)/n, where g represents a length of the connection piece recess, t represents a number of the connection piece recesses, r represents a number of the buffer recesses, d represents a length of the buffer recess, a represents a length of the body, and p represents a thickness of each of n side walls arranged in a length direction of the body.

For the plastic component according to the embodiments of the present disclosure, by defining the buffer recess at the first side surface of the body and defining the connection piece recess at the second side surface, materials used in the plastic component can be reduced and costs can be saved. Moreover, feasibility of injection molding may be assured by satisfying the at least one of condition 1) and condition 2).

According to some embodiments of the present disclosure, projection areas of the connection piece recess and the buffer recess on the body are offset from each other.

According to some embodiments of the present disclosure, the second side surface has two connection piece recesses, and the first side surface has one buffer recess. The two connection piece recesses are located at two ends of the buffer recess, where t=2, r=1, and n=4.

According to some embodiments of the present disclosure, the first side surface is connected to the second side surface through an outer peripheral surface, and the second side surface has a thinned groove having an outer peripheral groove wall and a groove bottom wall. The outer peripheral groove wall is separated from the outer peripheral surface, and the connection piece recess is defined in the groove bottom wall.

According to some embodiments of the present disclosure, the connection piece recess is provided with a positioning protruding post protruding away from the first side surface the positioning protruding post having an end surface flush with the groove bottom wall of the thinned groove.

According to some embodiments of the present disclosure, the body is of a flat plate-like structure and has a length greater than or equal to 300 mm, a width greater than or equal to 100 mm, and a thickness greater than or equal to 4 mm.

According to sonic embodiments of the present disclosure, the thickness of the body is less than or equal to 30 mm.

According to some embodiments of the present disclosure, the length of the buffer recess is greater than or equal to 285 mm, a width of the buffer recess is greater than or equal to 96 mm, and the depth of the buffer recess is greater than or equal to 2.5 mm.

According to some embodiments of the present disclosure, a dimension of the connection piece recess in a length direction of the body is greater than or equal to 50 mm; a dimension of the connection piece recess in a width direction of the body is greater than or equal to 86 mm; and a depth of the connection piece recess is greater than or equal to 2.5 mm.

According to some embodiments of the present disclosure, the connection piece recess has a rounded corner at a side of the connection piece recess close to the buffer recess. A fillet radius of the rounded corner ranges from 5 mm to 20 mm.

According to some embodiments of the present disclosure, the pole through hole is located at a center of the body in a width direction of the body.

According to some embodiments of the present disclosure, the n side walls include a first side wall and a second side wall. The first side wall is a side wall of the connection piece recess away from the buffer recess. The second side wall is a side wall of the connection piece recess close to the buffer recess. A distance between the pole through hole and the first side wall is greater than a distance between the pole through hole and the second side wall.

A battery according to another aspect of the embodiments of the present disclosure includes the plastic component according to any one of the above embodiments of the present disclosure.

According to some embodiments of the present disclosure, the battery further includes a cover plate. The cover plate is located at a side of a first side surface of the plastic component and has a liquid injection hole. A projection of the liquid injection hole on the first side surface is located in the buffer recess, and the flow guide hole is offset from the liquid injection hole.

According to some embodiments of the present disclosure, the battery further includes a connection piece and a pole. The pole passes through the pole through hole. The connection piece is located at a side of a second side of the plastic component and includes a pole connection segment and a tab connection segment connected to the pole connection segment. The pole connection segment is located in a connection piece recess and fixedly connected to the pole. The tab connection segment extends front the plastic component, and an angle between the tab connection segment and the pole connection Segment ranges from 70° to 110°.

According to some embodiments of the present disclosure, the battery further includes at least one bare cell provided at a side of the pole connection segment facing away from the plastic component. A longitudinal extending direction of the bare cell is consistent with a length direction of the body, a longitudinal end portion of the bare cell is a tab, and the tab is connected to the tab connection segment.

According to some embodiments of the present disclosure, the bare cell has a protrusion protruding towards the plastic component. The protrusion includes a proximal portion and a distal portion, and the proximal portion is closest to the plastic component. A distance between the distal portion and the plastic component is greater than the distance between the proximal portion and the plastic component, and a projection of the flow guide hole on the protrusion is located at the distal portion, or a flow guide hole is offset from the protrusion.

According to some embodiments of the present disclosure, the buffer recess internally has a plurality allow guide holes penetrating the body in a thickness direction of the body. Each of two sides of the proximal portion has the plurality of flow guide holes.

According to some embodiments of the present disclosure, the battery includes a plurality of bare cells. A flow guide holes is located at a center line between two adjacent bare cells.

A battery module according to another aspect of the embodiments of the present disclosure includes the battery according to any one of the above embodiments of the present disclosure.

An electric device according to another aspect of the embodiments of the present disclosure includes the battery module according to the above embodiments of the present disclosure.

For the battery, the battery module, and the electric device according to the embodiments of the present disclosure, by defining the buffer recess at the first side surface of the body and defining the connection piece recess at the second side surface, the materials used in the plastic component can be reduced and the costs can be saved. Moreover, the feasibility of injection molding may be ensured by satisfying the at least one of condition 1) and condition 2).

The additional aspects and the advantages of the present disclosure will be partially set forth in the following description, and in part will be apparent from the following description, or may be learned by practice of the present disclosure.

REFERENCE SIGNS

DETAILED DESCRIPTION

Embodiments of the present disclosure will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, in which identical or similar reference signs denote identical or similar elements or elements with identical or similar functions through the accompanying drawings. The following embodiments described with reference to the drawings are illustrative and intended to explain the present disclosure, rather than being interpreted as limitations on the present disclosure.

In description of the present disclosure, it should be understood that orientations or positional relationships indicated by terms “longitudinal”, “transverse”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, and the like are based on orientations or positional relationships shown in the drawings, and facilitate the description of the present disclosure and simplify the description merely, rather than indicating or implying that the associated apparatus or element must have specific orientations and are constructed and operated in the specific orientations, and thus should not be construed to limit the present disclosure.

In addition, the terms “first” and “second” are used only for description and shall not be interpreted as an indication or implication of relative importance or an implicit indication of the number of technical features. Thus, features associated with “first” and “second” may include at least one or more such features, either explicitly or implicitly. In the description of the present disclosure, “a plurality of” means two or more, unless otherwise specifically defined.

In the present disclosure, unless otherwise specifically stated and defined, terms “mounted”, “connect”, “connect to”, “fixed”, and the like should be understood broadly. For example, it may be a fixed connection, detachable connection, or integrally formed; it may be a mechanical connection, an electric connection, or a communication; it may be a direct connection, an indirect connection through an intermediary, or a communication between the interiors of two elements or mutual acting relationship between the two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the embodiments of the present disclosure can be understood according to specific circumstances.

A plastic component10according to embodiments of the present disclosure will be described in detail with reference toFIG.1toFIG.11. The plastic component10may be used in a battery. The battery includes a housing and a battery top cover. The housing has a receiving space, and the receiving space is provided with a battery cell. The battery top cover is used for sealing an opening of the receiving space. In some embodiments, the plastic component10may be formed as a part of the battery top cover.

Referring toFIG.1toFIG.6, the plastic component10according to the embodiments of the present disclosure includes a body having a first side surface1and a second side surface2facing away from the first side surface1. In some embodiments, with reference toFIG.1, an upper surface of the body is the first side surface1, and a lower surface of the body is the second side surface2.

The first side surface1has a buffer recess11, and the buffer recess11is recessed towards the second side surface2. As illustrated inFIG.1, the buffer recess11is recessed downwards. The buffer recess11has at least one flow guide hole12, and the flow guide hole12penetrates the body in a thickness direction of the body. When the plastic component10is applied in the battery, an operation of injecting liquid into the battery may be completed through the flow guide hole12. The buffer recess11is used as a buffer area of electrolyte, which may effectively prevent excessive liquid injection pressure from damaging a bare cell in a battery housing. Moreover, the internal pressure of the battery cell can be balanced. A recessed structure of the buffer recess11also enhances a mechanical strength of a liquid injection area of the body to some extent.

In some embodiments of the present disclosure, one flow guide hole12is provided, thereby facilitating simplification of processing process of the plastic component10. Moreover, a liquid injection process is easy to manage when a number of the flow guide holes12is small.

In some embodiments of the present disclosure, a plurality of flow guide holes12is provided, thereby facilitating an improvement in liquid injection efficiency.

The second side surface2has a connection piece recess21, and the connection piece recess21is recessed towards a direction where the first side surface1is located. When the plastic component10is applied in the battery, a connection piece may be at least partially installed and positioned in the connection piece recess21, thereby facilitating a reduction in an overall thickness of the connection piece after the connection piece is connected to the plastic component10. In addition, a recessed structure of the connection piece recess21strengthens a mechanical strength of a connection piece area of the body to some extent.

In some embodiments of the present disclosure, the plastic component10satisfies at least one of: condition 1: 1 mm≤c−e≤2 mm and 1 mm≤c−f≤2 mm, where c is a thickness of the body, f is a depth of the buffer recess11, e is a depth of the connection piece recess21; and condition 2: 1 mm≤p≤2 mm, p=(a−t*g−r*d)/n, where g represents a length of the connection piece recess21, t represents a number of the connection piece recesses21, r represents a number of the buffer recesses11, d represents a length of the buffer recess11, a represents a length of the body, and p represents a thickness of each of n side walls arranged in a length direction of the body.

For the plastic component10according to the above embodiments, by defining the buffer recess11at the first side surface1of the body and defining the connection piece recess21at the second side surface2, materials used in the plastic component10can be reduced and costs can be saved. Moreover, feasibility of injection molding may be guaranteed by satisfying the at least one of condition 1) and condition 2).

In some embodiments, the plastic component10is generally manufactured by using injection molding process. The injection molding process has a poor molding effect on an injection molded part with a thickness greater than 2 mm. Moreover, the plastic component longitudinally occupies a large space, which may increase a weight of the battery, resulting in a reduced battery energy density. Conversely, in response that the thickness is less than 1 mm, a requirement for a strength of the injection molded part is not satisfied.

In condition 1), a range of 1 mm≤c−e≤2 mm indicates a distance between a bottom surface of the connection piece recess21and the first side surface1, i.e., a wall thickness of the body at the connection piece recess21. A range of 1 mm≤c−f≤2 mm represents a distance between a bottom surface of the buffer recess11and the second side surface2, i.e., a wall thickness of the body at the buffer recess11. On one hand, the feasibility of injection molding may be assured, and a structural strength of the plastic component10at the groove is ensured. On the other hand, it can ensure the buffer recess11can withstand an impact force of the injected electrolyte and a weight of the accommodated electrolyte, and prevent the buffer recess11from being bent and deformed when the battery is exposed to heat or vibration.

In the illustrated implementations, the first side surface1has one buffer recess11, and the second side surface2has two connection piece recesses21. The two connection piece recesses21are located at two ends of the buffer recess11respectively, allowing t=2, r=1, and n=4. With reference toFIG.4, in the length direction of the body, four side walls are provided at a bottom of the plastic component10: from left to right, they are respectively referred to as a first side wall13, a second side wall14, a third side wall15, and a fourth side wall16, i.e., n=4. In condition 2), 1 mm≤p≤2 mm, which ensures feasibility of injection molding for each side wall and guarantees quality of the injection molding. In addition, a thickness of each side wall should satisfy an equation p=(a−2g−d)/4 which guarantees equal thickness for the four side walls. Moreover, a side wall thickness is in a range of 1 mm≤p≤2 mm, which may also ensure the structural strength of the plastic component during assembly or when subjected to vibration. Further, equal thickness among the side walls ensures uniform force distribution on each part of the plastic component and reduces deformation of the plastic component when subjected to force. It can be understood that, in other implementations, t, r, and n may also be other numerical values and may be determined as desired, which is not exemplarily limited herein.

The first side wall13is a left side wall of a left connection piece recess21. The second side wall14is a right side wall of the left connection piece recess21and a left side wall of the buffer recess11. The third side wall15is a right side wall of the buffer recess11and a left side wall of a right connection piece recess21. The fourth side wall16is a right side wall of the right connection piece recess21.

Through condition 1) and condition 2), a wall thickness between adjacent structures is ensured to be controlled in a range of 1 mm to 2 mm. In a case where the feasibility of injection molding and structural strength are satisfied, a large amount of production materials are also saved.

In some examples, c−f may be 1 mm, 1.3 mm, 1.4 mm, 1.6 mm, 1.8 mm, or 2 mm. Certainly c−e may also be other numerical values between 1 mm and 2 mm, which are not listed here.

In some examples, c−e may be equal to c−f, greater than c−f, or less than c−f

In some examples, p may be 1 mm, 1.1 mm, 1.3 mm, 1.7 mm, 1.9 mm, or 2 mm. Certainly, p may also be other numerical values between 1 mm and 2 mm, which are not listed here.

It can be understood that in other embodiments, the plastic component satisfies one of condition 1) and condition 2).

Referring toFIG.1toFIG.6, a pole through hole4is defined in the connection piece recess21and penetrates the body in the thickness direction of the body. The pole through hole4is used for a pole to pass through, and the connection piece is welded and fixed to the pole.

In some embodiments of the present disclosure, referring toFIG.6, the pole through hole4is located at a center of the body in a width direction of the body. i.e., H1=H2. In this way, a structure of the plastic component10is an axisymmetric structure. When the plastic component10is installed in the battery, the plastic component10has no directivity. Moreover, even if the plastic component10is horizontally rotated by 180°, the plastic component10is still viable, thereby facilitating saving an assembly time.

In some embodiments of the present disclosure, referring toFIG.4toFIG.6, n side walls include a first side wall13and a second side wall14. The first side wall13is a side wall of the connection piece recess21away from the buffer recess11. The second side wall14is a side wall of the connection piece recess21close to the buffer recess11. A distance between the pole through hole4and the first side wall13is greater than a distance between the pole through hole4and the second side wall14. It may be noted that “the distance between the pole through hole4and the first side wall13” refers to a distance between a center of the pole through hole4and the first side wall13, “the distance between the pole through hole4and the second side wall14” refers to a distance between the center of the pole through hole4and the second side wall14, and the distance between the center of the pole through hole4and the first side wall13is greater than the distance between the center of the pole through hole4and the second side wall14, i.e., H3>H4. In this way, the center of the pole through hole4is far away from an edge of the body, which may reduce a hole cracking risk at the pole through hole4.

With the plastic component10according to the embodiments of the present disclosure, the buffer recess11is defined at the first side surface1of the body, so that the electrolyte may be buffered, and the bare cell in the battery housing may be prevented from being damaged due to excessive liquid injection pressure. Moreover, the material of the body may be decreased. By defining the connection piece recess21at the second side surface2, the overall thickness of the connection piece can be lowed after being connected to the plastic component10and thither reduce the material of the body. Therefore, the material required for forming the plastic component10and the time required for injection molding cooling are saved, which greatly economizes on the cost.

In some embodiments of the present disclosure, projection areas of the connection piece recess21and the buffer recess11on the body are offset from each other. In this way, the thickness of the body is not excessively reduced, which helps keep the body high in strength.

According to some embodiments of the present disclosure, an offset between the projection area of the connection piece recess21on the body and the projection area of the buffer recess11on the body ranges from 1 mm to 2 mm. As illustrated inFIG.5, the offset between the projection area of the connection piece recess21on the body and the projection area of the buffer recess11on the body is p, i.e., the thickness of the side wall, and p is greater than or equal to 1 mm and less than or equal to 2 mm. When p is less than 1 mm, a connection strength between the connection piece recess21and the buffer recess11is small, and the body is easy to crack in an area between the connection piece recess21and the buffer recess11; and when p is greater than 2 mm, it will result in significant fluctuations in the thickness of the body, consequently leading to an increased level of injection molding difficulty and a decreased success rate of injection molding. Exemplarily, p may be 1 mm, 1.1 mm, 1.3 mm, 1.7 mm, 1.9 mm, 2 mm, or the like. Certainly, p may also be other numerical values in the range of 1 mm and 2 mm. The enumeration of details shall be eschewed henceforth.

In some embodiments of the present disclosure, referring toFIG.2,FIG.4, andFIG.6, the second side surface2has two connection piece recesses21, and the first side surface1has one buffer recess11. The two connection piece recesses21are located at each of two ends of the buffer recess11. In this way, the connection piece area is offset from a liquid injection buffer area, which is beneficial to reasonably utilizing the space. Moreover, the two connection piece recesses21facilitate a connection between the plastic component10and the two connection pieces respectively. The recessed structure of the buffer recess11enhances a mechanical strength of a middle area of the body to some extent. Moreover, the recessed structure of the connection piece recess21strengthens a mechanical strength of areas at the two ends of the body to some extent.

In some embodiments of the present disclosure, referring toFIG.2andFIG.7, the body has a predetermined thickness. The first side surface1is connected to the second side surface2through an outer peripheral surface3, and the second side surface2has a thinned groove22having an outer peripheral groove wall221and a groove bottom wall222. The outer peripheral groove wall221is separated from the outer peripheral surface3, and the connection piece recess21is defined in the groove bottom wall222. By defining the thinned groove22, a mechanical strength of the second side surface2of the body may be enhanced to some extent. The thinned groove22may also be used as a hot melting area of a polyester film Mylar. In some embodiments, a top of the polyester film Mylar is disposed in the thinned groove22, and a connection between the polyester film Mylar and the body is realized through hot melting process.

According to some embodiments of the present disclosure, referring toFIG.8, the connection piece recess21is provided with a positioning protruding post212protruding away from the first side surface1. An end surface of the positioning protruding post212is flush with the groove bottom wall222of the thinned groove22. The positioning protruding post212is offset from the pole through hole4and may position the connection piece. For example, the connection piece has a positioning hole, and the positioning protruding post212is inserted into the positioning hole. Therefore, positioning of the connection piece in the connection piece recess21is realized, thereby facilitating welding and fixing of the connection piece and the pole in the pole through hole4.

In some embodiments of the present disclosure, the body is of a flat plate-like

structure and has a length greater than or equal to 300 mm and a width greater than or equal to 100 mm. In this way, it can be guaranteed that the body is matched with the corresponding battery, preventing negative impact on normal use of the body due to its size being too small. Moreover, the thickness of the body is greater than or equal to 4 mm, which may ensure that the strength of the body is excessively reduced because the thickness of the body is too thin. In some embodiments, referring toFIG.3toFIG.5, the length of the body is a, where a is greater than or equal to 300 mm, a width of the body is b, where b is greater than or equal to 107 mm, and the thickness of the body is c, where c is greater than or equal to 4 mm. Exemplarily, a may be 300 mm, 310 mm, 320 mm, 330 mm, 340 mm, etc., b may be 100 mm, 105 mm, 110 mm, 113 mm, 116 mm, 119 mm, etc., and c may be 4 mm, 6 mm, 8 mm, 10 mm, 12 mm, etc. Of course, a, b, and c may also be other numerical values greater than their respective lower limit values, which are not exhaustively listed herein.

In some embodiments of the present disclosure, the thickness of the body is less than or equal to 30 mm, which may ensure that the body is thin, thus saving materials. The thin body is beneficial to improving injection molding efficiency of the plastic component10, as well as increasing a success rate of forming the plastic component10.

In some embodiments of the present disclosure, the length of the buffer recess11is greater than or equal to 285 mm, a width of the buffer recess11is greater than or equal to 96 mm, and the depth of the buffer recess11is greater than or equal to 2.5 mm. In this way, it can be ensured that the buffer recess11is matched with the corresponding battery, with a great area and sufficient depth. The buffer recess11can well buffer the liquid during liquid injection, avoiding a case where a size of the buffer recess11is too small and affects a buffer effect on the liquid during injection, such as liquid overflow. In some embodiments, referring toFIG.3toFIG.5, the length of the buffer recess11is d, where d is greater than or equal to 285 mm. The width of the buffer recess11is m, where m is greater than or equal to 96 mm. The depth of the buffer recess11is f, and f is greater than or equal to 2.5 mm. Exemplarily, d may be 2 mm, 4 mm, 5 mm, 6 mm, 10 mm, etc., m may be 96 mm, 100 mm, 104 mm, 108 mm, 112 mm, 116 mm, etc., and f may be 2.5 mm, 2.7 mm, 2.9 mm, 3.1 mm, 3.3 mm, etc. Certainly, d, in, and f may also be other numerical values greater than their respective lower limit values, which will not be exhaustively listed here.

In some embodiments of the present disclosure, a dimension of the connection piece recess21in the length direction of the body is greater than or equal to 50 mm, a dimension of the connection piece recess21in a width direction of the body is greater than or equal to 86 mm, and the depth of the connection piece recess21is greater than or equal to 2.5 mm. In this way, it can be ensured that the connection piece recess21is matched with the corresponding battery, with the great area and sufficient depth, thereby lowering a connection difficulty when the connection piece recess21is connected to the connection piece. In some embodiments, referring toFIG.5andFIG.6, the dimension of the connection piece recess21in the length direction of the body is g, where g is greater than or equal to 50 mm. The dimension of the connection piece recess21in the width direction of the body is q, where q is greater than or equal to 86 mm. The depth of the connection piece recess21is e, and e is greater than or equal to 2.5 mm. Exemplarily, g may be 50 mm, 52 mm, 54 mm, 56 mm, 58 mm, and so on. Similarly, q may be 86 mm, 88 mm, 90 mm, 92 mm, 94 mm, and so forth. Likewise, e may be 2.5 mm, 2.7 mm, 2.9 mm, 3.0 mm, etc. Certainly, a, q, and e may also be other numerical values greater than their respective lower limit values, which will not be exhaustively listed here.

In some embodiments of the present disclosure, referring toFIG.6, the connection piece recess21has a rounded corner211at a side of the connection piece recess21close to the buffer recess. A fillet radius of the rounded corner211ranges from 5 mm to 20 mm. A fillet size of the rounded corner211matches an outer dimension of the connection piece, allowing the rounded corner211to perform position restriction on the connection piece. In addition, compared with a right angle, the structure of the rounded corner211may also alleviate a stress concentration phenomenon at the corner of the connection piece recess21, avoiding fracture of the plastic component10.

In some embodiments of the present disclosure, the body may further have a liquid return hole penetrating the body in the thickness direction of the body, allowing the electrolyte at a top of the body to flow back through the liquid return hole when the battery is inverted.

According to the embodiments in another aspect of the present disclosure, a battery includes the plastic component10according to the above embodiments.

For the battery according to the embodiments of the present disclosure, by defining the buffer recess11at the first side surface1of the body and defining the connection piece recess21at the second side surface2, the materials in the plastic component10can be reduced and the costs can be saved. Moreover, the feasibility of injection molding may be ensured by satisfying the at least one of condition 1) and condition 2).

In some embodiments of the present disclosure, as illustrated inFIG.1,FIGS.2, andFIG.10, the battery further includes a cover plate20. The cover plate20is located at a side of a first side surface1of the plastic component10and has a liquid injection hole201. A projection of the liquid injection hole201on the first side surface1is located in a buffer recess11, and a flow guide hole12is offset from the liquid injection hole201. In this way, after the electrolyte enters the buffer recess11from the liquid injection hole201, the electrolyte may be fully buffered in the buffer recess11, and then enter the battery from the flow guide hole12, thereby reducing an impact force of the electrolyte on an interior of the battery and allowing the liquid injection process to be more stable. As illustrated inFIG.1toFIG.3andFIG.6, the flow guide hole12is located in the buffer recess11and is close to a connection piece recess21at a right end. Certainly, in some embodiments not illustrated in the drawings, the flow guide hole12may be located in the buffer recess11and close to a connection piece recess21at a left end, or the flow guide hole12may be located at a center position of the buffer recess11.

In some embodiments of the present disclosure, as illustrated inFIG.1andFIG.2,FIG.9andFIG.10, the battery further includes a connection piece30and a pole. The pole passes through the pole through hole4. The connection piece30is located at a side of a second side2of the plastic component10and includes a pole connection segment301and a tab connection segment302. The pole connection segment301is directly connected to the tab connection segment302, or the pole connection segment301is indirectly connected to the tab connection segment302through a middle connection segment. The pole connection segment301is located in a connection piece recess21and fixedly connected to the pole. The tab connection segment302extends away from the plastic component10, and an angle between the tab connection segment302and the pole connection segment301is in a range of 70° to 110°. The tab connection segment302is adapted to be connected to other parts of the battery (for example, the tab401of the bare cell40mentioned below), and the tab connection segment302and the pole connection segment301are located in different planes, which facilitates an arrangement of the tab connection segment302at a position convenient for a connection operation, and decreases a lateral size of the battery (i.e., a size of the battery in a F1-F2direction). Exemplarily, the angle between the tab connection segment302and the pole connection segment301is 90°, i.e., the tab connection segment302is perpendicular to the pole connection segment301.

In some embodiments of the present disclosure, as illustrated inFIG.1andFIG.2,FIG.9andFIG.10, the battery further includes at least one bare cell40provided at a side of the pole connection segment301facing away from the plastic component10. A longitudinal extending direction of the bare cell40is consistent with a length direction of a body. A longitudinal end portion of the bare cell40is a tab401, and the tab401is connected to the tab connection segment302. The length direction of the body is the F1-F2direction illustrated inFIG.10, and the longitudinal extending direction of the bare cell40is consistent with the length direction of the body, allowing a distance between a plane area of sidewall surface of the bare cell40and the flow guide hole12on the body to be small. In this way, when the electrolyte enters the battery through the flow guide hole12, the electrolyte may be in contact with the plane area of sidewall surface of the bare cell40more effectively and quickly, thus facilitating faster soak of the bare cell40and shortening the idle time. In addition, the tab401is located at a side surface, which is convenient for a connection between the tab401and the tab connection segment302.

FIG.11is a schematic diagram of a relative position of a bare cell40and a plastic component10in a cross-section perpendicular to the F1-F2direction inFIG.10. In some embodiments of the present disclosure, as illustrated inFIG.1andFIG.2,FIG.10andFIG.11, the bare cell40has a protrusion402protruding towards the plastic component10. The protrusion402includes a proximal portion4021and a distal portion4022, and the proximal portion,4021is closest to the plastic component10. A distance between the distal portion4022and the plastic component10is greater than the distance between the proximal portion4021and the plastic component10. As illustrated inFIG.11, the distance between the proximal portion4021and the plastic component10is H1, the distance between the distal portion4022and the plastic component10is H2, and H2>H1. The proximal portion4021is the nearest position of the bare cell40from the plastic component10, which is the highest point of the bare cell40. A predetermined space is defined between the protrusion402and the plastic component10, which may reduce obstruction of the electrolyte when passing through the space, and facilitate downward flow and diffusion of the electrolyte.

In an example, an outer surface of the protrusion402may be constructed as a semi-cylindrical surface, such that the proximal portion4021is a generating line of the semi-cylindrical surface.

In some embodiments, the projection of the flow guide hole12on the protrusion402is located at the distal portion4022. In this way, when the electrolyte enters the interior of the battery through the flow guide hole12, the electrolyte directly drops on the distal portion4022instead of the proximal portion4021, and the distal portion4022can guide the electrolyte faster to a side surface space of the bare cell40.

Alternatively, in other embodiments, the flow guide hole12is offset from the protrusion402, i.e., the flow guide hole12directly faces towards the side surface space of the bare cell40, and the electrolyte may directly enter the side surface space of the bare cell40through the flow guide hole12.

In some embodiments of the present disclosure, the buffer recess11internally has a plurality of flow guide holes12penetrating the body in a thickness direction of the body. Each of two sides of the proximal portion4021has the plurality of flow guide holes12. The plurality of flow guide holes12may disperse the electrolyte, thereby reducing the impact force on the bare cell40and improving the liquid injection efficiency of the battery. In addition, a soaking speed of the electrolyte on the bare cell40is enhanced, and the idle time is reduced.

In an example, two flow guide holes12are provided and disposed on the distal portions4022at two sides of the proximal portion4021, respectively. Alternatively, in another example, the two flow guide holes12may be provided and disposed at two sides of the bare cell40, respectively.

In other embodiments of the present disclosure, one flow guide hole12is provided.

In some embodiments of the present disclosure, the battery includes a plurality of bare cells40. A flow guide hole12is located at a center line between two adjacent bare cells40. In this way, a space below the flow guide hole12is great, and the obstruction to the electrolyte may be decreased.

A battery module according to the embodiments in another aspect of the present disclosure includes the battery according to any one of the above embodiments.

For the battery module according to the embodiments of the present disclosure, the buffer recess11is defined at the first side surface1of the body, and the connection piece recess21is defined at the second side surface2of the body, which may reduce the materials used in the plastic component10and save the costs. Moreover, the feasibility of injection molding may be ensured by satisfying the at least one of condition 1) and condition 2).

In some embodiments, one battery module may include one or more batteries. The plurality of batteries is electrically connected to each other in a series, parallel, or series-parallel manner. The term plurality may refer to two or more.

An electric device according to another embodiment of the present disclosure includes the battery module according to the above embodiments.

For the electric device according to the embodiments of the present disclosure, by defining the buffer recess11at the first side surface1of the body and the connection piece recess21at the second side surface2, the materials in the plastic component10can be reduced and the costs can be saved. Moreover, the feasibility of injection molding may be ensured by satisfying the at least one of condition 1) and condition 2).

In some embodiments, the electric device may include one or more battery modules. The plurality of battery modules may be electrically connected to each other in series, parallel, or series-parallel connection.

An electric device includes, but is not limited to, an energy storage device and a vehicle. The energy storage device may be an energy storage container. The energy storage container includes a box body and a battery cluster disposed in the box body. The battery cluster includes a cluster frame and a plurality of battery packs, and the plurality of battery modules is installed on the cluster frame. The energy storage device may also be a household energy storage cabinet.

The battery module may be applied in the vehicle as a power battery pack. The Vehicle includes, but is not limited to, a pure electric vehicle, a hybrid vehicle, an extended-range electric vehicles, and the like.

In descriptions of this specification, descriptions in the reference terns “an embodiment”, “some embodiments”, “example”, “specific example”, “some examples” or the like mean that the specific features, structures, materials or characteristics described in combination with the embodiments or the examples are included in at least one embodiment or example of the present disclosure. In the present specification, the schematic representation of the above terms does not necessarily mean the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable mode. In addition, various embodiments or examples described in the specification, as well as features of various embodiments or examples, may be combined by those skilled in the art.

Although the embodiments of the present disclosure have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and should not be construed as limiting the present disclosure. Those of ordinary skill in the art can make changes, modifications, substitutions and modifications to the above-mentioned embodiments within the scope of the present disclosure.