BATTERY, BATTERY CELL, BATTERY MODULE, ELECTRICAL DEVICE, END CAP ASSEMBLY AND MANUFACTURING METHOD FOR BATTERY

The present application provides an end cap assembly, a battery cell, a battery module, a battery, an electrical device, and a manufacturing method for the end cap assembly. The end cap assembly is applied to the battery cell and includes: an end cap sheet, electrode columns, and adapter sheets; the end cap sheet is provided with electrode through holes; the electrode columns are configured for inputting or outputting electric energy of the battery cell, the electrode columns cover the electrode through holes, each electrode column is provided with a first concave portion recessed towards an interior of the battery cell; and each of the adapter sheets is provided with a second concave portion matching with the first concave portion, and configured for electrically connecting the electrode columns with an electrolytic cell or a galvanic cell inside the battery cell.

TECHNICAL FIELD

The present application relates to the field of batteries, and more particularly to an end cap assembly, a battery cell, a battery module, a battery, an electrical device, and a manufacturing method.

BACKGROUND

Nowadays, the new energy industry is getting more and more attention, therefore, higher requirements have been put forward for the battery as a core component, such as, the requirement for the battery to achieve higher energy density and lower cost, etc.

At present, a battery shell generally includes a housing and an end cap assembly, the battery shell provides a closed space to accommodate the electrode assembly and the electrolyte, and the electrical energy of the electrode assembly is led out through the electrode columns and other structures of the end cap assembly. In the existing end cap assembly, the electrode columns and the adapter sheets are connected by welding, the requirement on the dimensional tolerance of the fittings is very high, and the fraction defective of the product is high.

SUMMARY

The embodiments of the present application embodiment provide an end cap assembly, a battery cell, a battery module, a battery, an electrical device, and a manufacturing method, which have a low requirement on the dimensional tolerance of fittings, and can improve the yield of the product significantly.

In a first aspect, an end cap assembly is provided, which is applied to a battery cell and includes: an end cap sheet, electrode columns, and adapter sheets; the end cap sheet is provided with electrode through holes; the electrode columns are configured for inputting or outputting electric energy of the battery cell, the electrode columns cover the electrode through holes, each electrode column is provided with a first concave portion recessed towards an interior of the battery cell; and each of the adapter sheets is provided with a second concave portion matching with the first concave portion, and configured for electrically connecting the electrode columns with an electrolytic cell or a galvanic cell inside the battery cell.

In the end cap assembly of an embodiment of the present application, since the electrode columns are fixedly connected with the adapter sheets through the first concave portion and the second concave portion. Therefore, particle impurities generated during welding of the electrode columns and the adapter sheets can be avoided and the yield of the product can be improved. On the other hand, since the end cap assembly of the embodiment of the present application has lower requirements for fitting dimensional tolerances compared to the welded connected structure, it can also improve the yield of the product.

In some embodiments, an angle θ formed between an inner side wall of the second concave portion and an inner bottom wall of the second concave portion is less than 90°. Thus, the first concave portion can be embedded into the structure formed between the inner side wall of the second concave portion and the inner bottom wall of the second concave portion, so that the first concave portion is limited by the side wall of the second concave portion and is difficult to be pulled out, and the connection between the electrode columns and the adapter sheets is improved.

In some embodiments, an outer side wall of the first concave portion is tightly fitted with an inner side wall of the second concave portion. Thus, the first concave portion and the second concave portion are connected to each other in a larger area, which can improve the connection between the electrode columns and the adapter sheets.

In some embodiments, the electrode column is provided with a third concave portion recessed towards an interior of the battery cell, and the first concave portion is recessed from a bottom of the third concave portion towards the interior of the battery cell. By forming the third concave portion on the electrode column, cracks caused by excessive deformation of the electrode column and/or adapter sheet during the connecting and fixing of the electrode column and adapter sheet can be avoided.

In some embodiments, the adapter sheet is provided with a convex portion protruding away from the interior of the battery cell, and the second concave portion is recessed from a top of the convex portion towards the interior of the battery cell. By forming the convex portion on the adapter sheet, cracks caused by excessive deformation of the electrode column and/or adapter sheet during the connecting and fixing of the electrode column and adapter sheet can be further avoided.

In some embodiments, a bottom of the third concave portion is tightly fitted with the top of the convex portion, to fixedly connect to the top of the convex portion. Thus, the connection area between the electrode column and the adapter sheet is larger, and the connection between the electrode column and the adapter sheet is further improved.

In some embodiments, the end cap assembly further includes a sealing member, sandwiched between the end cap sheet and the adapter sheet, and configured for sealing the interior of the battery cell and the electrode through holes. Thus, the electrolyte inside the battery cell can be reliably prevented from flowing out of the electrode through hole to ensure the sealing performance of the battery cell.

In some embodiments, the end cap assembly further includes an insulation assembly, and the insulation assembly includes a first insulation member adjacent to the electrode through hole along a direction perpendicular to a penetrating direction of the electrode through hole, the first insulation member is configured for insulating the electrode column and the end cap sheet, and/or insulating the adapter sheet and the end cap sheet. Thus, the adapter sheet and the end cap sheet can be separated by the first insulation member and the sealing member to avoid short circuit, and the end cap sheet can be sealed more reliably by the sealing member together with the first insulation member.

In some embodiments, the insulation assembly includes a second insulation member away from the electrode through hole along the direction perpendicular to the penetrating direction of the electrode through hole, and the second insulation member is configured for insulating the adapter sheet and the end cap sheet. Thus, the end cap sheet and the adapter sheet can be reliably separated to avoid short circuit, and the end cap sheet can be sealed more reliably by the sealing member together with the first insulation member.

In some embodiments, the sealing member is located between the first insulation member and the second insulation member along the direction perpendicular to the penetrating direction of the electrode through hole. Thus, the sealing member is fixed by the first insulation member and the second insulation member, to seal the end cap sheet more reliably.

In some embodiments, the first insulation member comprises an extension portion extending into the electrode through hole to separate the end cap sheet from the electrode column and/or the adapter sheet. Thus, the extension portion separates the end cap sheet from the electrode column and/or adapter sheet protruding into the electrode through hole, and the occurrence of a short circuit can be avoided more reliably.

In some embodiments, an insulation sheet is arranged between the electrode column and the end cap sheet. Thus, the insulation sheet separates the end cap sheet from the electrode column, and the occurrence of a short circuit can be avoided more reliably.

In a second aspect, the present application provides a battery cell, which includes the end cap assembly of the first aspect.

In a third aspect, the present application provides a battery module, which includes the battery cell of the second aspect.

In a fourth aspect, the present application provides a battery, which includes the battery module of the third aspect.

In a fifth aspect, the present application provides an electrical device, which includes the battery of the fourth aspect.

In a sixth aspect, the present application provides a manufacturing method for an end cap assembly, which includes: providing an end cap sheet provided with electrode through holes; providing electrode columns configured for inputting or outputting electric energy of the battery cell, wherein the electrode columns cover the electrode through holes, each electrode column is provided with a first concave portion recessed towards an interior of the battery cell; and providing adapter sheets, wherein each of the adapter sheets is provided with a second concave portion matching with the first concave portion, and configured for electrically connecting the electrode columns with an electrolytic cell or a galvanic cell inside the battery cell.

The above description is only a summary of the technical solution of the present application. In order to better understand the technical means of the present application, it can be implemented in accordance with the contents of the specification, and in order to make the above and other purposes, features and advantages of the present application more clearly understand, the specific implementation of the present application is listed below.

DETAILED DESCRIPTION OF EMBODIMENTS

Embodiments of the present application will be described in detail in combination with the attached drawings below. The following embodiments are intended only to more clearly illustrate the technical solution of the present application and are therefore intended as examples only and cannot be used to limit the scope of protection of the present application.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as normally understood by those skilled in the art for which the present application is made; the terms used herein are for the purpose of describing specific embodiments only and are not intended to restrict the present application; the terms “includes” and “has” in the specification and claims of the present application and in the accompanying illustrations above, and any variation thereof, are intended to cover non-exclusive inclusion. In the description of the present application embodiment, the technical terms “first”, “second”, etc., are used only to distinguish different objects and are not to be construed as indicating or implying relative importance or as implicitly indicating the number, particular order or primary or secondary relationship of the indicated technical features.

Reference to “embodiments” in the present application means that a particular feature, structure or characteristic described in conjunction with an embodiment may be included in at least one embodiment of the present application. The occurrence of the phrase at various locations in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that embodiments described herein may be combined with other embodiments.

In the description of the present application embodiment, unless there is additional explicit stipulation and limitation, terms such as “mount”, “connect with each other”, “connect”, “fix”, and so on should be generalizedly interpreted, for example, “connect” can be interpreted as being fixedly connected, detachably connected, or connected integrally; “connect” can also be interpreted as being mechanically connected or electrically connected; “connect” can be further interpreted as being directly connected or indirectly connected through intermediary, or being internal communication between two components or an interaction relationship between the two components. For the one of ordinary skill in the art, the specific meanings of the aforementioned terms in the present application can be interpreted according to specific conditions.

In the description of embodiments of the present application, the term “and/or” is only a kind of association relation describing the associated object, indicating that there can be three kinds of relations, such as A and/or B, which can mean: A alone, A and B simultaneously, and B alone. In addition, the character “/” in the present application generally means that the related object is an “or” relationship.

In the present application, “a plurality of” means more than two (including two), in the same way that “a plurality of groups” means more than two groups (including two groups), and “a plurality of sheets” means more than two sheets (including two sheets).

In the present application, the battery cell includes a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium ion battery, a sodium-ion battery, or a magnesium ion battery, etc., which is not limited in the embodiments of the present application. The battery cell can be in a shape of a cylindrical, a flat, a cuboid or other shapes, which is not limited in the embodiments of the present application. Battery cells are generally divided into three types according to the way of encapsulating: cylindrical battery cells, square square battery cells, and soft pack battery cells, which is not limited in the embodiments of the present application.

The battery referred to in embodiments of the present application is a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include battery modules or battery packs, etc. The battery generally includes a box body for encapsulating one or more battery cells. The box body can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

The battery module referred to in embodiments of the present application includes a plurality of battery cells and a frame structure for fixing the battery cells, and the plurality of battery cells are stacked on each other. The frame structure includes an end plate located at both ends of the battery module for limiting the movement of the battery cells, in one specific embodiment, the frame structure further includes a side plate fixedly connected with the end plate to sandwich the battery. The output electrode of the battery and the output electrode base are mounted onto the end plate, and the electrical signal in the battery module is transmitted to the outside of the battery module through the output electrode.

The battery cell referred to in embodiments of the present application includes an electrode assembly consisting of a positive electrode sheet, a negative electrode sheet and an isolation diaphragm, and an electrolyte. The battery cell operates mainly by moving metal ions between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive current collector and a positive active substance layer. The positive active substance layer is coated on the surface of the positive current collector, the current collector that is not coated with the positive active substance layer protrudes from the current collector that is coated with the positive active substance layer, and the current collector that is not coated with the positive active substance layer is used as a positive electrode tab. Taking the lithium-ion battery as an example, the material of the positive current collector can be an aluminum, and the positive active substance can be a lithium cobaltate, a lithium iron phosphate, a ternary lithium or a lithium manganate, etc. The negative electrode sheet includes a negative current collector and a negative active substance layer, the negative active substance layer is coated on the surface of the negative current collector, the current collector that is not coated with the negative active substance layer protrudes from the current collector that is coated with the negative active substance layer, and the current collector that is not coated with the negative active substance layer is used as a negative electrode tab. The material of the negative current collector can be a copper, and the negative active substance can be a carbon or a silicon, etc. In order to ensure that no fusing occurs through a large current, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the isolation diaphragm can be PP or PE, etc. In addition, the electrode assembly has a winding structure or a a laminated structure, which is not limited in the embodiments of the present application.

The battery cell also includes a shell plate and an electrode assembly arranged in the shell plate, the shell plate includes an end cap assembly and a shell, the end cap assembly includes electrode columns and adapter sheets, and the electrode assembly includes electrode tabs, the electrode assembly is electrically connected with the electrode tabs through the adapter sheets for outputting electrical energy of the battery cell, or for connecting with an external power source to charge the battery cell.

In the end cap assembly of the existing battery cell, the electrode columns and the adapter sheets are usually connected by welding. Welding connection requires high dimensional tolerance of the accessories, and particle impurities are generated during welding. The particle impurities are absorbed in the battery cell due to static electricity, and even puncture the diaphragm and affect the battery life. Therefore, the defect rate of the product is higher.

In view of this, the present application provides an end cap assembly used to the battery cell, and the end cap assembly includes: an end cap sheet, electrode columns, and adapter sheets; the electrode column is provided with a first concave portion recessed towards an interior of the battery cell, the adapter sheet is provided with a second concave portion matching with the first concave portion. Since the electrode columns are fixedly connected with the adapter sheets through the first concave portion and the second concave portion. Therefore, particle impurities generated during welding of the electrode columns and the adapter sheets can be avoided, the present application has lower requirements for fitting dimensional tolerances and can also improve the yield of the product.

The technical solutions described in the embodiments of the present application are applicable to a variety of battery-using devices, such as a mobile phone, a portable device, a laptop computer, an electric cart, an electric toy, an electric tool, an electric vehicle, a ship, and a spacecraft, etc., the spacecraft includes such as an aircraft, a rocket, a space shuttle, and a spaceship.

It should be understood that the technical solution described in the embodiments of the present application is not limited to the devices described above, but may also be applicable to all devices using batteries. However, for the sake of brevity, the following embodiments are illustrated with electric vehicles as examples.

The following, specific embodiments of the present application are described in detail.

FIG.1is a structural schematic view of a vehicle800in an embodiment of the present application. The vehicle800can be a fuel vehicle, a gas vehicle or a new energy vehicle, the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor400, a controller300and a battery500can be arranged inside the vehicle, and the controller300is used to control the battery500to supply power to the motor400. For example, the battery500can be arranged at the bottom of the vehicle or at the front or rear of the vehicle. The battery500can be used for the power supply of the vehicle, for example, the battery500can be used as the operating power supply of the vehicle, for the circuit system of the vehicle800, for example, for the working power needs of the vehicle800during start-up, navigation and operation. In another embodiment of the present application, the battery500may be used not only as an operating power source for the vehicle800, but also as a driving power source for the vehicle800, substituting or partially substituting fuel oil or natural gas to provide driving power for the vehicle800.

In order to meet different power needs, the battery can include a plurality of battery cells, and the plurality of battery cells can be connected in series or in parallel or in a combination of series and parallel, and the combination of series and parallel refers to the mixture of connected in series and connected in parallel. The battery can also be called a battery pack. In the embodiment, the plurality of battery cells are first connected in series or in parallel or in a combination of series and parallel to form a battery module, and a plurality of battery modules are then connected in series or in parallel or in a combination of series and parallel to form a battery. That is to say, a plurality of battery cells can be directly formed into a battery, or a battery module can be formed first, and a plurality of battery modules can then be formed into a battery.

FIG.2is a structural schematic view of a battery500in an embodiment of the present application. The battery500can include a plurality of battery cells101. The battery500can further include a box body600(or cover body), the box body600is a hollow structure, the plurality of battery cells1are accommodated in the box body600. As shown inFIG.2, the box body600includes a first housing601and a second housing602, and the first housing601and the second housing602are snap-fitted together. The shapes of the first housing601and the second housing602are determined according to the shape of the combination of the plurality of battery cells101, and the first housing601and the second housing602each has an opening. For example, the first housing601and the second housing602are hollow cuboids with one face of each being an opened face, the opening of the first housing601and the opening of the second housing602are arranged opposite each other, and the first housing601and the second housing602are snap-fitted to form a box body with a closed cavity. The plurality of battery cells101are connected in series or in parallel or in a combination of series and parallel and then placed in the box body formed by snap-fitting the first housing601and the second housing602.

The number of battery cells101can be arranged to any value depending on the power demand. The plurality of battery cells101can be connected in series, in parallel, or in a combination of series and parallel to achieve greater capacity or power. Since the battery500contains a large number of battery cells101, in order to facilitate to be mounted, the battery cells10can be arranged in groups, and a group of battery cells101form a battery module100. The number of battery cells101included in battery module100is not limited and can be set according to requirements. For example, a battery may include a plurality of battery modules100, which may be connected in series or in parallel or in a combination of series and parallel.

FIG.3shows an explosion view of a battery module100in some embodiments of the present application. As shown inFIG.3, the battery module100includes a plurality of battery cells101and a frame structure for fixing the battery cells101, the plurality of battery cells101are stacked with each other along the length direction. The frame structure includes end plates105, and the end plates105located at both ends of the battery cell101along the length direction, and are used to limit the movement of the battery cells101along the length direction. In a specific embodiment, the frame structure further includes side plates (not shown in the FIG.), two side plates are located on both sides of the the battery cells101along the width direction, and the side plates are connected with the end plates105to form the frame structure. In another preferred embodiment, the frame structure is not provided with the side plates, and the battery cells101are stacked and connected through cable ties102. The end plates105and cable ties102form the frame structure. The battery module100also includes the Cell Connection System (CCS)103, and the CCS103includes two output electrodes104, which are used to led out the electrical energy of the battery module100.

FIG.4is an explosion view of a battery cell101in some embodiments of the present application. As shown inFIG.4, the battery cell101includes a shell plate50and an electrode assembly40arranged in the shell plate50, the shell plate50includes an end cap assembly30and a shell20with an opening, and the electrode assembly40is arranged in the shell20through an opening in the shell20. The electrode assembly40includes a main portion41and electrode tabs42, and the electrode tabs42are extended from the main portion41. The main portion41includes a positive electrode sheet, a negative electrode sheet and an isolation membrane. The main portion41is a winding structure formed by the winding of the positive electrode sheet, the isolation diaphragm and the negative electrode sheet, or a laminated structure formed by the stacking arrangement of the positive electrode sheet, the isolation diaphragm and the negative electrode sheet. The positive electrode tab421and the negative electrode tab422are located on a same side of the main body41or on opposite sides of the main body41respectively. As shown inFIG.4, the positive electrode tab421and the negative electrode tab422are exemplified on the same side of main portion41. The end cap assembly30covers the opening of the shell20, so as to form a closed space for accommodating the electrode assembly40and the electrolyte. The end cap assembly30includes two electrode columns303for electrically connecting with the electrode tabs42to output electrical energy from the battery cell101, or for connecting to an external power source to charge the battery cell101. A pressure relief mechanism100is located between two electrode columns303. The end cap assembly30further includes adapter sheets304, and the electrode columns303are electrically connected to the electrode tabs42through the adapter sheets304.

FIG.5is an explosion view of an end cap assembly30in some embodiments of the present application.FIG.6is top view of the end cap assembly30after assembled inFIG.5.FIG.7is a cross-sectional view of the end cap assembly30along an A-A direction inFIG.6.FIG.8is an enlarged view of an area X inFIG.7.FIG.9is a structural schematic view of an electrode column303and an adapter sheet304.

As shown inFIGS.5to9, in some embodiments of the present application, the end cap assembly30includes an end cap sheet301, electrode columns303, and adapter sheets304. The end cap sheet301is provided with electrode through holes302. The electrode columns303are used to input or output electrical energy of the battery cell, and the electrode columns303cover the electrode through holes302. Each electrode column303is provided with a first concave portion305recessed towards an interior of the battery cell101. Each adapter sheet304is provided a second concave portion306matching with the first concave portion305for electrically connecting the electrode column303to an electrolytic cell or galvanic cell inside the battery cell101.

The through holes302include a positive electrode through hole302aand a negative electrode through hole302b.The electrode column303includes a positive electrode column303aand a negative electrode column303b.The adapter sheet304includes a positive adapter sheet304acorresponding to a positive electrode column303aand a negative adapter sheet304bcorresponding to a negative electrode column303b.Each electrode column303is provided with the first concave portion305recessed towards an interior of the battery cell101through the through hole302. Each adapter sheet304is provided with the second concave portion306matching with the first concave portion305. Thus, the electrode column303and the adapter sheet304are connected through the first concave portion305and the second concave portion306, so that the connection of electrode column303and adapter sheet304can be avoided by welding.

The positive electrode column303aand the negative electrode column303bare made of aluminum and are used for welding connection with the bus bar outside the battery cell101. The positive adapter sheet304ais made of aluminum, the negative adapter sheet304bis made of copper, and the end cap sheet301is made of aluminum and is used for welding connection with the shell plate50.

In some embodiments, the electrode column303and the adapter sheet304are fixed by a tight fit between the first concave portion305and the second concave portion306. More specifically, as shown inFIGS.7to9, the first concave portion305includes a first concave bottom portion305aand a first concave bottom side wall305b,and the second concave portion306includes a second concave bottom portion306aand a second concave side wall306b.The outer bottom wall of the first concave bottom portion305ais pressed against the inner bottom wall of the second concave bottom portion306a.In other embodiments, the outer side wall of the first concave side wall305bis pressed against the inner side wall of the second concave side wall306b.Thus, the second concave portion306tightly wraps the first concave portion305, and the connection area is larger. For example, a die can be used to stamp the electrode column303and adapter sheet304in the shape of a plate, so that the metal electrode column303and adapter sheet304are deformed by cold extrusion at the stamping place, thus forming the first concave portion305and the second concave portion306that are tightly fitted to each other. At the position where the first concave portion305and the second concave portion306are tightly fitted, the metal material produces atomic level friction due to extrusion deformation, thus a certain tensile and shear strength are provided, so that the electrode column303and the adapter sheet304are reliably fixed and connected.

Since the electrode column303and adapter sheet304are fixed and connected by making the metal material tightly fit through cold extrusion deformation, particle impurities that affect the performance of battery unit101like welding connections will not be generated, and a certain operating space for welding operations like welding connections do not need to be reserved, so that the dimensional tolerance requirements for accessories are very low. For example, in case that the usual end cap assembly is made by welding process, the tolerance requirements of the accessories are limited to ±0.05 mm, while the dimensional tolerance requirements of the end cap assembly30for the accessories can be relaxed to ±0.3 mm, so the production cost of the accessories can be reduced, and the yield of the products is significantly improved. In addition, in the prior art, when the negative electrode adapter304bmade of copper is connected to the external bus by welding, it is necessary to use a copper-aluminum composite plate for transition, and a number of different accessories are used at the two electrode through holes302, while the end cap assembly30in the present application does not need to consider the problem of welding transition. In addition to the different materials and setting directions of the positive adapter sheet304aand the negative adapter sheet304b,the structure of the positive electrode through hole302aand the negative electrode through hole302b(including the configuration of accessories and accessories) can be exactly the same, thus the types of parts are reduced and the manufacturing costs is reduced.

In some embodiments, as shown inFIG.8, the Angle θ formed between the inner side wall of the second concave side wall306band the inner bottom wall of the second concave bottom portion306ais less than 90°. Thus, the second concave portion306forms a ring corner portion to embed the first concave portion305, and the metal material produces sufficient plastic deformation at the ring corner portion through cold extrusion, which can further improve the connection between the electrode column303and the adapter sheet304, and effectively avoid the electrode column303being pulled out. The Angle θ formed between the inner side wall of the second concave side wall306band the inner bottom wall of the second concave bottom portion306acan be arranged by adjusting the shape of the die that is in contact with the adapter sheet304during stamping process.

FIG.10is a schematic view of the end cap assembly30in some embodiments of the present application and the corresponding part ofFIG.8.FIG.11is the structural schematic view of an electrode column303and a adapter sheet304in some embodiments of the present application.

FIGS.10to11show the end cap assembly30in some embodiments of the present application. For ease of explanation, the reference signs of the same or corresponding structure as in the end cap assembly30shown inFIGS.5to9are omitted.

In some embodiments, as shown inFIGS.10to11, the electrode column303is provided with a third concave portion307recessed toward the inside of the battery cell101, and the first concave portion305is recessed from a third concave bottom portion307aof the third concave portion307towards the interior of the battery cell101. As shown inFIG.11, the third concave portion307is provided with a third concave bottom portion307aand a third concave side wall307bextended inclinedly adjacent to the interior of the battery cell101.

In some embodiments shown inFIGS.5to9, the electrode column303does not have the third concave portion307described above, and the parts of electrode column303except the first concave portion305are basically parallel to the end cap sheet301. Such a structure requires the adapter sheet304having a portion provided with a large deformation and pass through the through hole302in order to fix and connect the electrode column303to the adapter sheet304through the first concave portion305and the second concave portion306. However, the metal material is easy to crack in the bending part with a large deformation, and the electrode column303can be provided with a part extending to the through hole302in a more gentle way except for the first concave portion305by providing the third concave portion307. Thus, the adapter sheet304can be connected with the electrode column303through a small deformation. It can avoid cracks caused by excessive deformation of the adapter sheet304when the electrode column303and the adapter sheet304are connected and fixed to each other, while the deformation amplitude of the third concave portion307and the first concave portion305is relatively gentle, and the electrode column303will not cause cracks.

In some embodiments, as shown inFIGS.10to11, the adapter sheet304is provided with a convex portion308that protrudes away from the side of the interior of the battery cell101, and the second concave portion306is recessed from a convex top portion308atowards the side of the interior of the battery cell101. The convex portion308is provided with a convex bottom portion308aand a convex side wall308bextended inclinedly away from the interior of the battery cell101.

In other embodiments (not shown), the adapter sheet304does not have the above convex portion308, and the part other than the second concave portion306is basically parallel to the end cap sheet301, which requires the electrode column303to pass through the through hole302with a large deformation to fix and connect the electrode column303and the adapter sheet304. However, the adapter sheet304can be provided with a part extending to the through hole302in a more gentle manner except for the second concave portion306by providing the convex portion308as shown inFIG.10andFIG.11. Thus, the electrode column303can be connected with the adapter sheet304through a small deformation. It can avoid cracks caused by excessive deformation of the electrode column303when the electrode column303and the adapter sheet304are connected and fixed to each other, while the deformation amplitude of the second concave portion307and the convex portion308is relatively gentle, and the adapter sheet304will not cause cracks.

As shown inFIG.10, the extension of the third concave side wall307bto the side of the interior of the battery cell101is generally equal to the extension of the fourth concave side wall308baway from the side of the interior of the battery cell101, so that the electrode column303and the adapter sheet304do not have severe deformation to avoid cracks in the metal material.

In some embodiments, as shown inFIG.10, the third concave bottom portion307ais tightly fitted and fixed to the convex top portion308a.For example, the electrode column303and the adapter sheet304are further stamped to form the third concave portion307and the convex portion308, respectively, so that the metal material is deformed by cold extrusion at the stamping position, thus the third concave portion307and convex308that are tightly fitted to each other are formed. Therefore, the fixed connection area between the electrode column303and the adapter sheet304is larger, which has stronger shear resistance and tensile resistance.

In some embodiments, as shown inFIGS.5,8, and10, the end cap assembly30further includes a sealing member309, and the sealing member309is sandwiched between the end cap sheet301and the adapter sheet304for sealing the interior of the battery cell101and the electrode through holes302. For example, the sealing member309is an elastic rubber O-ring that seals the gap between the end cap sheet301and the adapter sheet304to prevent electrolyte leakage in the battery cell101. In addition, the sealing member309is extruded to deform by the end cap sheet301and the adapter sheet304by means of the stamping force to the electrode column303and the adapter sheet304during the fixed connection between the electrode column303and the adapter sheet304, which further improves the sealing performance.

In some embodiments, as shown inFIG.5,FIG.8,FIG.10, the end cap assembly30further includes an insulation assembly310, and the insulation assembly310includes a first insulation member310aadjacent to the electrode through hole302along a direction perpendicular to a penetrating direction of the electrode through hole302, the first insulation member310ais configured for insulating the electrode column303and the end cap sheet304, and/or insulating the adapter sheet304and the end cap sheet301. The first insulation member310ais capable of separating the electrode column303and/or the adapter sheet304from the end cap sheet301at the electrode through hole302to prevent short circuit resulting from contact between the electrode column303and/or the adapter sheet304and the end cap sheet301.

In some embodiments, as shown inFIGS.5,8, and10, the insulation assembly310includes a second insulation member310baway from the electrode through hole302along the direction perpendicular to the penetrating direction of the electrode through hole302, and the second insulation member310bis configured for insulating the adapter sheet304and the end cap sheet301. The second insulation member310bis capable of separating the adapter sheet304from the end cap sheet301at a position other than the electrode through hole302to prevent the short circuit caused by contact between the adapter sheet304and the end cap sheet301.

In some embodiments, as shown inFIGS.5,8, and10, the sealing member309is located between the first insulation member310aand the second insulation member310balong the direction perpendicular to the penetrating direction of the electrode through hole302. Thus, the sealing member309is sandwiched and fixed between the first insulation member310aand the second insulation member310b.For example, the second insulating member310bcan be fixed to the end cap sheet301by bonding, while the first insulating member310acan be fixed by the joint extrusion of the end cap sheet301, the electrode column303and the adapter sheet304. The sealing member309can be easily fixed by being assembled between the first insulation member310aand the second insulation member310b,and the first insulation member310aand the second insulation member310balso have a sealing effect to achieve better sealing performance together with the sealing member309.

In addition, the second insulation member310bof the insulation positioning assembly310can further be fixed to the adapter sheet304, so that the electrode column303connected to the adapter sheet304is further fixed, in particular, for example, the end cap sheet301, the sealing member309, the first insulation member310a,the second insulation member310b,the electrode column303, the adapter sheet304and the insulation sheet311below are assembled together, and the end cap assembly30can be formed after stamping and connecting the electrode column303and the adapter sheet304. There is no need to use any injection molding or welding connection between the accessories. It can reduce many parts that need to be used with injection molding or welding process, and the dimensional tolerance requirements for the accessories are very low, the manufacturing process is simple and the cost is low. In other embodiment, the adapter sheet304and/or the electrode column303can also be fixed to the end cap sheet301using an insulation member other than the second insulation member310b,and the end cap assembly30can also be formed by simple assembly.

FIG.12shows a structural schematic view of the first insulation member310a.

In some embodiments, as shown inFIGS.9and12, the first insulation member310aincludes an extension portion310a1extending into the electrode through hole302to separate the end cap sheet301from the electrode column303and/or the adapter sheet304. The first insulation member310afurther includes a base310a2located on the top cap sheet301adjacent to the side of the interior of the battery cell101, and the extension portion310a1extending from an end of the base310a2away from the sealing member309towards and through the electrode through hole302, which completely separates the electrode column303and/or the adapter sheet304from contact with the end cap sheet301at the through hole302to avoid short circuit. Specifically, the first insulation member310ais in a shape of a ring.

In some embodiments, as shown inFIG.5, the second insulation member310bhas a shape corresponding to that of the end cap sheet301and is fixed to the end cap sheet301. Thus, the second insulation member310bseparates the end cap sheet301from the electrode assembly40inside the battery cell101, thereby reliably avoiding the occurrence of short circuit.

In some embodiments, as shown inFIG.5,FIG.8,FIG.10, an insulation sheet311is arranged between the electrode column303and the end cap sheet301. The insulation sheet311is a plastic sheet, for example, the thickness of the insulation sheet311is 0.5 mm, and the insulation sheet311separates the end cap sheet301from the electrode column303, so as to more reliably avoid short circuit when both the positive electrode and the negative electrode of the battery cell101are connected to the end cap sheet301made of aluminum.

Above, the end cap assembly30of the embodiment of the present application is described.

In another aspect, the present application further provides a battery cell101including the end cap assembly30described above.

In another aspect, the present application further provides a battery module100including the battery cell101described above.

In a further aspect, the present application further provides a battery500including the battery module100described above.

In a further aspect, the present application further provides an electrical device including the battery500described above, and the battery500is used to supply electric energy. In the embodiment, the electrical device is a vehicle800as shown inFIG.1, or the electrical device is a ship or a spacecraft.

The present application further provides a manufacturing method for an end cap assembly.

FIG.13shows a flowchart of a manufacturing method for an end cap assembly30in an embodiment of the present application.

As shown inFIG.13, the manufacturing method of the embodiment includes:Step S1, providing an end cap sheet301provided with electrode through holes302;Step S2, providing electrode columns303configured for inputting or outputting electric energy of the battery cell101, and the electrode columns303cover the electrode through holes302, each electrode column303is provided with a first concave portion305that is recessed towards an interior of the battery cell101;Step S3, providing adapter sheets304, each of the adapter sheets304is provided with a second concave portion306matching with the first concave portion305, and configured for electrically connecting the electrode columns303with an electrolytic cell or a galvanic cell inside the battery cell101.

In the embodiment, the electrode column303and the adapter sheet304form the first concave portion305and the second concave portion306by a way of stamping. For example, preparing an end cap sheet301, a sealing member309, a first insulation member310a,a second insulation member310b,a flat-shaped electrode column303, a flat-shaped adapter sheet304, and an insulation sheet311as accessories of the end cap assembly30; bonding the second insulation member310bto a side of the end cap sheet301adjacent to the interior of the battery cell101; placing the sealing member309and the first insulation member310asuccessively between the end cap sheet301and the second insulation member310b;arranging the the insulation sheet311and the electrode column303on a side of the end cap sheet301away from the interior of the battery cell101; and arranging the adapter sheet304on a side of the second insulation member310badjacent to the interior of the battery cell101and fixing the adapter sheet304with the second insulation member310b.The configuration order of the accessories in the above assembly method can be changed arbitrarily, as long as the basic structure of the end cap assembly30is formed. Then, contacting the electrode column303through a first die that enables to form a shape of the first concave portion305; and contacting the adapter sheet304through a second die that enables to form a shape of the second concave portion306. The first die pushes the material of the electrode column303and the adapter sheet304into a cavity of the second die to fully stretch and deform through stamping, so as to form the first concave portion305and the second concave portion306that are fixedly connected. In addition, the sealing member309, the first insulation member310a,the second insulation member310band the insulation sheet311are pressed by the force applied by stamping, and the end cap assembly30is then formed after being removed from the die.

In some embodiments, another manufacturing method for the end cap assembly30is further provided. The difference is that the die is used to perform stamping twice. Through a first stamping, forming a third concave portion307recessed towards an interior of the battery cell101on the electrode column303, and forming a convex portion308protruding away from the interior of the battery cell101on the adapter sheet304. Through a second stamping, forming the first concave portion305recessed from a bottom of the third concave portion307towards the interior of the battery cell101on the electrode column303, and forming the second concave portion306recessed from a top of the convex portion308towards the interior of the battery cell101on the adapter sheet304. In the embodiment, after forming the basic structure of the end cap assembly30, contacting the electrode column303through a third die that enables to form a shape of the third concave portion307; and contacting the adapter sheet304through a fourth die that enables to form a shape of the convex portion308. Through the first stamping, the third concave portion307is initially connected and fixed with the top of the convex portion308, the first die is then used to contact the third concave bottom portion307a,and the second die is used to contact the convex top portion308a,the first concave portion305and the second concave portion306are formed by stamping, and the end cap assembly30is then formed after being removed from the die.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application and not to limit the above embodiments. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or equivalently replace some or all of the technical features. These modifications or substitutions do not separate the essence of the corresponding technical solutions from the scope of the technical solutions of the various embodiments of the present application, and they should all be covered within the scope of the claims and specifications of the present application. Especially, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the specification, but includes all technical solutions falling within the scope of the claims.