Top cover assembly, battery and energy storage device

Abstract

The invention provides a top cover assembly, a battery and an energy storage device. The top cover assembly is used for packaging the battery. The top cover assembly comprises a cover plate, a pole and a current collecting piece, wherein the cover plate comprises a first surface and a second surface which are oppositely arranged along a first direction; the pole penetrates through the first surface and the second surface; the current collecting piece is arranged on one side of the second surface of the cover plate; wherein the current collecting piece comprises a first connecting part, a bending part and a second connecting part which are connected in sequence, the first connecting part is electrically connected with the pole, and the second connecting part is bent relative to the first connecting part; a first limiting part is arranged on the second surface, a second limiting part is arranged on the second connecting part, and the first limiting part is matched with the second limiting part. According to the top cover assembly and the battery provided by the invention, the accumulated error after the current collecting piece is folded can be reduced, and the folding precision of the current collecting piece is improved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to a top cover assembly, a battery and an energy storage device. Background Art

[0002] In the prior art, the current collecting plate of the top cover assembly needs to be folded twice to form a Z-shaped structure, so that the center of the battery cover plate can be aligned with the center of the winding core, thereby realizing the assembly of the top cover assembly and the battery body.

[0003] However, after the current collecting disc is folded multiple times, the cumulative error of the current collecting disc becomes larger. During the assembly process of the top cover assembly and the battery body, it is easy for the current collecting disc to rub against the inner wall of the aluminum shell to form metal wires, which will contact the winding core and cause the winding core to short-circuit. When the cumulative error of the current collecting disc is larger, there may even be a conflict between the current collecting disc and the aluminum shell, making it impossible to assemble the top cover assembly and the battery body. Moreover, the larger the cumulative error after the current collecting disc is folded multiple times, the more likely it is that the top cover assembly and the aluminum shell will not be concentric, making the gap between the top cover assembly and the aluminum shell uneven, which can easily affect the welding stability between the top cover assembly and the aluminum shell. At the same time, after the current collecting disc is folded multiple times, the length of the current collecting disc is longer and the resistance is greater, which can easily affect the current flow performance of the current collecting disc. In addition, after the current collecting disc is folded multiple times, the proportion of the overall battery cover in the height direction of the battery body is increased, which limits the design size in the height direction of the winding core, which is not conducive to the miniaturization design of the battery. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present application provides a top cover assembly, a battery and an energy storage device, which can reduce the cumulative error of the current collecting member after folding and improve the folding accuracy of the current collecting member.

[0005] On the one hand, the present application provides a top cover assembly for packaging a battery, characterized in that it includes:

[0006] The cover plate comprises a first surface and a second surface which are arranged opposite to each other along a first direction;

[0007] a pole penetrating the first surface and the second surface; and

[0008] a current collecting member, disposed on one side of the second surface of the cover plate;

[0009] In which, the current collecting part includes a first connecting part, a bending part and a second connecting part which are connected in sequence, the first connecting part is electrically connected to the pole, and the second connecting part is bent relative to the first connecting part; a first limiting part is arranged on the second surface, a second limiting part is arranged on the second connecting part, and the first limiting part cooperates with the second limiting part.

[0010] The top cover assembly provided in the embodiment of the present application, on the one hand, is electrically connected to the pole through the first connection part of the current collector, and the second connection part of the current collector is bent relative to the first connection part through the bending part and is used to electrically connect to the winding core of the battery. The current collector only needs to be bent once and can form an electrical connection between the winding core and the pole. Since the current collector is bent only once, the cumulative error of the current collector is smaller, which can reduce the probability that the current collector and the battery shell form a conflict and the top cover assembly and the battery body cannot be assembled. Moreover, the cumulative error of the current collector is smaller, which can improve the concentricity of the top cover assembly and the battery shell, so that the gap between the top cover assembly and the battery shell is more uniform, which is conducive to improving the welding stability of the top cover assembly and the battery shell. At the same time, since the current collector is bent only once, the overall length of the current collector is shorter and the resistance is smaller, which is conducive to improving the current flow performance of the current collector. In addition, since the current collector is bent only once, the proportion of the battery cover plate as a whole in the height direction of the battery can be reduced, so that the design size of the winding core in the height direction of the battery can be made larger, which is conducive to the miniaturization and high energy density design of the battery. On the other hand, the first limiting portion on the second surface of the cover plate cooperates with the second limiting portion on the second connecting portion to further limit the error caused by the bending of the second connecting portion relative to the first connecting portion, which is beneficial to improving the bending accuracy of the second connecting portion relative to the first connecting portion, and can further reduce the probability of the top cover assembly and the battery body being unable to be assembled due to the conflict between the current collector and the battery shell, and further improve the welding stability between the top cover assembly and the battery shell. At the same time, the first limiting portion on the second surface of the cover plate cooperates with the second limiting portion on the second connecting portion, which can also make the current collector have the effects of anti-pulling, anti-twisting, and anti-vibration dislocation during assembly or in later vibration conditions, thereby preventing the current collector from tearing at the welding point with the pole ear of the winding core due to displacement or vibration.

[0011] In a possible embodiment, the first limiting portion includes a first limiting column and a second limiting column, and the first limiting column and the second limiting column are arranged at intervals on the second surface; the second limiting portion includes a first limiting hole and a second limiting hole, and the first limiting hole and the second limiting hole are arranged at intervals on the second connecting portion; the first limiting column cooperates with the first limiting hole, and the second limiting column cooperates with the second limiting hole.

[0012] The top cover assembly provided in the embodiment of the present application is provided by cooperating the first limiting post on the second surface of the cover plate with the first limiting hole on the second connection part, and the second limiting post on the second surface cooperates with the second limiting hole on the second connection part to further limit the error amount caused by the bending of the second connection part relative to the first connection part, which is beneficial to improve the bending accuracy of the second connection part relative to the first connection part, and can further reduce the probability of the top cover assembly and the battery body being unable to be assembled due to the conflict between the current collector and the aluminum shell, and further improve the welding stability of the top cover assembly and the aluminum shell. Moreover, the first limiting post and the second limiting post cooperate with the first limiting hole and the second limiting hole respectively to prevent the second connection part from rotating relative to the first connection part after being bent relative to the first connection part and causing a circumferential error, thereby making the stability of the current collector after bending better, which is beneficial to improve the stability of the current collector electrically connecting the pole and the winding core.

[0013] In a possible embodiment, the first limiting column includes a first limiting section and a second limiting section, one end of the second limiting section is fixed to the second surface, and the other end of the second limiting section is fixedly connected to the first limiting section; the second limiting section is coaxially arranged with the first limiting section, and the radial dimension of the second limiting section is greater than the radial dimension of the first limiting section; the radial dimension of the first limiting hole is greater than or equal to the radial dimension of the first limiting section, and the radial dimension of the first limiting hole is smaller than the radial dimension of the second limiting section; and / or; the second limiting column includes a third limiting section and a fourth limiting section, one end of the fourth limiting section is fixed to the second surface, and the other end of the fourth limiting section is fixedly connected to the third limiting section; the fourth limiting section is coaxially arranged with the third limiting section, and the radial dimension of the fourth limiting section is greater than the radial dimension of the third limiting section; the radial dimension of the second limiting hole is greater than or equal to the radial dimension of the fourth limiting section, and the radial dimension of the second limiting hole is smaller than the radial dimension of the fourth limiting section.

[0014] The top cover assembly provided in the embodiment of the present application is characterized in that the first limiting section of the first limiting column is penetrated by the first limiting hole and cooperates with the first limiting hole, and the second limiting section of the first limiting column is abutted against the second connecting part; and / or the third limiting section of the second limiting column is penetrated by the second limiting hole and cooperates with the second limiting hole, and the fourth limiting section of the second limiting column is abutted against the second connecting part; it can prevent the second connecting part from rotating relative to the first connecting part after being bent relative to the first connecting part and causing circumferential error, and it can also prevent the second connecting part from moving relative to the first connecting part after being bent relative to the first connecting part and causing axial error, thereby making the collector more stable after being bent, which is beneficial to improving the stability of the collector electrically connecting the pole and the winding core.

[0015] In a possible implementation manner, a positioning member is disposed on the second surface, and the positioning member is used to limit the position of the first connecting portion.

[0016] The top cover assembly provided in the embodiment of the present application is provided with a positioning piece on the second surface of the cover plate. The positioning piece limits the first connecting part, which can prevent the first connecting part from rotating relative to the pole after being electrically connected to the pole, which is beneficial to improving the stability of the current collector electrically connected to the pole and the winding core.

[0017] In a possible embodiment, the top cover assembly also includes an explosion-proof valve, the cover plate has a pressure relief hole, and the pressure relief hole passes through the first surface and the second surface; the explosion-proof valve is arranged at one end of the pressure relief hole close to the second surface and is spaced apart from the pole.

[0018] The top cover assembly provided in the embodiment of the present application is provided with an explosion-proof valve in the pressure relief hole of the cover plate, and the pressure relief hole runs through the first surface and the second surface of the cover plate. When the internal pressure of the battery increases abnormally, the explosion-proof valve will automatically open to release the internal pressure, which can prevent the battery formed by the top cover assembly from generating overpressure or overheating under charging, discharging or abnormal working conditions and causing explosion. At the same time, the explosion-proof valve is provided at one end of the pressure relief hole close to the second surface and is spaced from the pole, so that the explosion-proof valve can sense and automatically open in time when the internal pressure of the battery is abnormal, thereby improving the sensitivity of the explosion-proof valve.

[0019] In a possible implementation manner, the top cover assembly further includes a protective film, which covers an opening of the pressure relief hole close to the first surface.

[0020] The top cover assembly provided in the embodiment of the present application covers the first surface of the pressure relief hole close to the cover plate with a protective film, and the explosion-proof valve is arranged at the opening of one end of the pressure relief hole close to the second surface. The protective film can prevent external dust and other impurities from passing through the pressure relief hole and affecting the explosion-proof performance of the explosion-proof valve, which is beneficial to reducing the probability of failure of the explosion-proof valve.

[0021] In a possible implementation, the pole passes through the cover plate and is located at the center of the cover plate, and the explosion-proof valve passes through the cover plate and deviates from the center of the cover plate; the second connecting portion is bent relative to the first connecting portion in a direction away from the explosion-proof valve, and the explosion-proof valve and the second connecting portion are staggered along the first direction.

[0022] The top cover assembly provided in the embodiment of the present application has a cover plate passing through the pole and located at the center of the cover plate, the explosion-proof valve is arranged in the pressure relief hole passing through the cover plate and deviates from the center of the cover plate, and the second connection part is bent relative to the first connection part in a direction away from the explosion-proof valve, so that the second connection part and the explosion-proof valve are staggered along the first direction. Thus, the overlap between the second connection part and the explosion-proof valve can be avoided, thereby reducing the risk of overlap corrosion between the current collector and the explosion-proof valve.

[0023] In a possible implementation manner, the first limiting portion is disposed on a side of the pole away from the explosion-proof valve, and the second limiting portion is disposed on a side of the second connecting portion away from the bending portion.

[0024] The top cover assembly provided in the embodiment of the present application has a first limiting portion disposed on the side of the pole away from the explosion-proof valve, and a second limiting portion disposed on the side of the second connection portion away from the bending portion. When the second connection portion is bent relative to the first connection portion toward the side away from the explosion-proof valve, the side of the second connection portion away from the bending portion is further away from the explosion-proof valve than the side of the second connection portion connected to the bending portion. Thus, the first limiting portion on the second surface of the cover plate is easy to cooperate with the second limiting portion on the second connection portion.

[0025] In a possible implementation, the current collecting member is integrally formed, the cover plate is circular, the second connecting portion is fan-shaped, and the center of the circle where the cover plate is located and the center of the circle where the second connecting portion is located are arranged opposite to each other along the first direction.

[0026] The top cover assembly provided in the embodiment of the present application is circular through the cover plate, the pole passes through the cover plate and is located at the center of the cover plate, and the explosion-proof valve is arranged in the pressure relief hole passing through the cover plate and deviates from the center of the cover plate. When the second connection part is bent relative to the first connection part in the direction away from the explosion-proof valve by the bending part, since the second connection part is fan-shaped, and the center of the circle where the periphery of the cover plate is located and the center of the circle where the periphery of the second connection part is located are arranged relative to each other along the first direction, the area of ​​the welding area between the second connection part of the current collector and the winding core can be increased to increase the conductivity of the current collector, thereby increasing the energy density of the battery formed by the battery cover plate. Moreover, the current collector is integrally formed to achieve better processing effect and faster processing speed of the current collector, which is conducive to saving the material of the current collector and the cost of welding and assembling the current collector.

[0027] In a possible embodiment, the second connecting portion includes a transition portion and a collecting portion, and the first connecting portion, the bending portion and the transition portion are sequentially arranged in an integrated structure; the collecting portion is circular, and the collecting portion is connected to one end of the transition portion away from the bending portion, and the position where the transition portion is connected to the collecting portion is located on the side of the collecting portion facing the cover plate.

[0028] The top cover assembly provided in the embodiment of the present application includes a transition portion and a current collecting portion through the second connection portion, and the current collecting portion is circular, and the transition portion is connected to the side of the current collecting portion facing the cover plate to further reduce the length of the first connection portion and the bending portion, thereby making the overall length of the current collecting part shorter and the resistance smaller, which is conducive to improving the current passing performance of the current collecting part. Moreover, since the current collecting part is circular and the pole is arranged at the center of the cover plate, the area of ​​the current collecting part will be reduced, which can reduce the difficulty of welding between the current collecting part and the winding core.

[0029] In a possible implementation manner, a stopper is provided on the second surface of the cover plate, and the stopper is provided on a side of the pole close to the explosion-proof valve, and the stopper is used to abut against the winding core of the battery.

[0030] The top cover assembly provided in the embodiment of the present application is provided with a stopper on the second surface of the cover plate, and the stopper is provided on the side of the pole close to the explosion-proof valve so that the stopper can abut against the winding core of the battery, thereby limiting the movement of the winding core in the battery, thereby improving the stability of the winding core in the battery.

[0031] In a possible implementation, the pole passes through the cover plate and deviates from the center of the cover plate, and the explosion-proof valve passes through the cover plate and deviates from the center of the cover plate; the second connecting portion is bent relative to the first connecting portion in a direction close to the explosion-proof valve, and the explosion-proof valve and the second connecting portion are opposite to each other and spaced apart along the first direction.

[0032] The top cover assembly provided in the embodiment of the present application has a pole passing through a cover plate and deviating from the center of the cover plate, and an explosion-proof valve passing through a cover plate and deviating from the center of the cover plate, so that the spacing distance between the pole and the explosion-proof valve can be made larger, which is convenient for subsequent processing of the pole. At the same time, since both the pole and the explosion-proof valve are deviated from the center position of the cover plate, the cover plate has more design space, which is convenient for adding identification codes and other designs on the cover plate. Moreover, since the pole passes through the cover plate and deviates from the center of the cover plate, the length of the first connecting part can be made shorter and the area of ​​the second connecting part can be made larger, which is beneficial to reducing the bending length of the current collector and increasing the contact area between the current collector and the winding core, thereby making the overall length of the current collector shorter and the resistance smaller, which is beneficial to improving the current-passing performance of the current collector.

[0033] In a possible implementation manner, the first limiting portion is disposed on a side of the pole close to the explosion-proof valve, and the second limiting portion is disposed on a side of the second connecting portion away from the bending portion.

[0034] The top cover assembly provided in the embodiment of the present application has a first limiting portion disposed on the side of the pole close to the explosion-proof valve, and a second limiting portion disposed on the side of the second connection portion away from the bending portion. The first limiting portion and the second portion cooperate to limit the error amount caused by the bending of the second connection portion relative to the first connection portion, which is beneficial to improve the bending accuracy of the second connection portion relative to the first connection portion, and can further reduce the probability of the top cover assembly and the battery body being unable to be assembled due to the formation of a conflict between the current collector and the aluminum shell, and further improve the welding stability of the top cover assembly and the aluminum shell. At the same time, the first limiting portion on the second surface of the cover plate cooperates with the second limiting portion on the second connection portion, and can also make the current collector have the effects of anti-pulling, anti-twisting, and anti-vibration dislocation, whether it is during assembly or when used in later vibration conditions, thereby preventing the current collector from tearing at the welding point with the pole ear of the winding core due to displacement or vibration.

[0035] In a possible implementation manner, the second connection portion is provided with a communication hole, and the communication hole penetrates the second connection portion along the first direction.

[0036] The top cover assembly provided in the embodiment of the present application is provided with a connecting hole that penetrates the second connecting part along the first direction through the second connecting part, so that the accommodating space of the pole core is connected with the pressure relief hole that accommodates the explosion-proof valve through the connecting hole, so that the explosion-proof valve can automatically open when the internal pressure of the battery increases abnormally to release the internal pressure, and can prevent the battery formed by the top cover assembly from generating overpressure or overheating and causing explosion during charging, discharging or abnormal operating conditions.

[0037] In a possible implementation, the cover plate is circular, the second connection portion is circular, and the center of the circle where the cover plate is located and the center of the circle where the second connection portion is located are arranged opposite to each other along the first direction.

[0038] The top cover assembly provided in the embodiment of the present application is characterized in that the periphery of the cover plate is circular, the periphery of the second connecting part is circular, and the center of the circle where the periphery of the cover plate is located and the center of the circle where the periphery of the second connecting part is located are arranged relative to each other along the first direction. As a result, the area of ​​the second connecting part can be made larger, which is beneficial to increase the area of ​​welding between the second connecting part and the winding core and improve the stability of welding between the second connecting part and the winding core, thereby improving the current flow performance of the current collecting part.

[0039] In a possible implementation manner, the bending portion includes a first opening and a second opening, and the first opening and the second opening are arranged on opposite sides of the bending portion along a width direction of the current collecting member.

[0040] The top cover assembly provided in the embodiment of the present application includes a first opening and a second opening that are relatively arranged along the width direction of the current collecting part through a bending portion. During the bending process of the bending portion, the first opening and the second opening are used to guide the bending direction of the bending portion, which can reduce the bending error of the current collecting part to make the bending accuracy of the bending portion greater, which is beneficial to improving the overall accuracy of the current collecting part after bending, and further facilitates the battery cover plate to package the battery.

[0041] In a possible embodiment, the bending portion includes a first bending line and a second bending line, and the first bending line and the second bending line are arranged on opposite sides of the bending portion along the length direction of the current collector; the first bending line contacts the pole, and the second bending line contacts the second connecting portion.

[0042] The top cover assembly provided in the embodiment of the present application includes a first bending line and a second bending line extending along the width direction of the current collector through a bending portion, the first bending line is in contact with the pole, and the second bending line is in contact with the second connecting portion, so that when the second bending portion of the current collector is relative to the first bending portion, the bending occurs only in the bending portion, and the flatness of the first connecting portion and the second connecting portion will not be affected, which is conducive to further improving the bending accuracy of the current collector.

[0043] On the other hand, the present application also provides a battery, comprising:

[0044] A housing having a receiving cavity;

[0045] A winding core is received in the receiving cavity; and

[0046] The top cover assembly described above;

[0047] Wherein, the top cover assembly is used to encapsulate the shell; the pole of the top cover assembly, the current collecting part of the top cover assembly and the winding core are electrically connected in sequence.

[0048] The battery provided by the embodiment of the present application includes the above-mentioned top cover assembly through the battery. On the one hand, since the current collector is only bent once, the cumulative error of the current collector is smaller, which can reduce the probability of the current collector and the battery shell forming a conflict and failing to assemble the top cover assembly and the battery shell. Moreover, the cumulative error of the current collector is smaller, which can improve the concentricity of the top cover assembly and the battery shell, so that the gap between the top cover assembly and the battery shell is more uniform, which is conducive to improving the welding stability of the top cover assembly and the battery shell. At the same time, since the current collector is only bent once, the overall length of the current collector is shorter and the resistance is smaller, which is conducive to improving the current collector The current performance, and then improve the current performance of the battery output power. In addition, since the current collector is only bent once, the proportion of the battery cover plate as a whole in the height direction of the battery shell can be reduced, so that the design size of the battery core in the height direction of the battery can be made larger, which is conducive to the miniaturization and high energy density design of the battery. On the other hand, the first limiting portion on the second surface of the cover plate cooperates with the second limiting portion on the second connecting portion to further limit the error caused by the bending of the second connecting portion relative to the first connecting portion, which is beneficial to improving the bending accuracy of the second connecting portion relative to the first connecting portion, and can further reduce the probability of the top cover assembly and the battery body being unable to be assembled due to the conflict between the current collector and the battery shell, and further improve the welding stability of the top cover assembly and the battery shell. At the same time, the first limiting portion on the second surface of the cover plate cooperates with the second limiting portion on the second connecting portion, which can also make the current collector have the effects of anti-pulling, anti-twisting, and anti-vibration dislocation during assembly or later use in vibration and other working conditions, thereby preventing the current collector from tearing at the welding point with the pole ear of the battery winding core due to displacement or vibration, thereby improving the stability of the battery.

[0049] On the other hand, the present application also provides an energy storage device, comprising:

[0050] The battery mentioned above.

[0051] The energy storage device provided in the embodiment of the present application includes the above-mentioned battery. On the one hand, the battery can be miniaturized and designed with high energy density, which facilitates the miniaturization and high energy density design of the energy storage device. On the other hand, the welding stability of the battery is high, so that the stability of the energy storage device is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some implementation methods provided by the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0053] Figure 1 This is an assembly structure diagram of a battery provided in one embodiment of the present application;

[0054] Figure 2 is an exploded structural diagram of a battery provided in one embodiment of the present application;

[0055] Figure 3 It is an assembly structure diagram of a top cover assembly provided in the first embodiment of the present application;

[0056] Figure 4 is an exploded structural diagram of a top cover assembly provided in the first embodiment of the present application;

[0057] Figure 5 is a bottom view of a top cover assembly provided in the first embodiment of the present application;

[0058] Figure 6 is a front view of a top cover assembly provided in the first embodiment of the present application;

[0059] Figure 7 is a structural diagram of the first limiting column and the second limiting column provided in the first embodiment of the present application;

[0060] Figure 8 is a bottom view of a top cover assembly provided in the second embodiment of the present application before being bent;

[0061] Fig. 9 is a bottom view of a top cover assembly provided in the second embodiment of the present application after being bent;

[0062] Fig.10 is a bottom view of a first top cover assembly provided in the third embodiment of the present application;

[0063] Fig.11 It is a bottom view of the second top cover assembly provided in the third embodiment of the present application.

[0064] The following are the descriptions of the accompanying figures:

[0065] Battery-1000, top cover assembly-100, cover-10, first surface-10a, second surface-10b, pressure relief hole-11, mounting hole-12, pole-20, current collector-30, first connection part-31, second connection part-32, transition part-321, current collector-322, connecting hole-323, bending part-33, first opening-331, second opening-332, first bending line-333, second bending line-334, first limit Positioning part -40, first limiting column -41, first limiting section -411, second limiting section -412, second limiting column -42, third limiting section -421, fourth limiting section -422, second limiting part -50, first limiting hole -51, second limiting hole -52, positioning member -60, first positioning part -61, second positioning part -62, explosion-proof valve -70, protective film -80, stop member -90, shell -200, accommodating chamber -201, winding core -300. DETAILED DESCRIPTION

[0066] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0067] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be a component in the middle. When a component is referred to as being "mounted on" another component, it may be directly on the other component or there may be a component in the middle. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a component in the middle.

[0068] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those generally understood by technicians in the technical field of this application. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this application includes any and all combinations of one or more related listed items. The directional terms mentioned in the description of this application, such as "upper", "lower", "front", "back", "left", "right", "inner", "outer", "top", "side", "bottom", "top wall", "side wall", "bottom wall", "inner side wall", "outer side wall", "length direction", "width direction", "height direction", etc., are only referenced to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of this application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this application. In the description of this application, for example, "first", "second", "third", "fourth", etc., are only used to distinguish the objects described and do not have any order or technical meaning.

[0069] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0070] The present application provides an energy storage device, which includes a battery. The battery includes but is not limited to a battery module, a battery pack, a battery cluster, an energy storage station, etc., and the present application does not limit this.

[0071] See also Figure 1 and Figure 2 , Figure 1 is an assembly structure diagram of a battery provided in one embodiment of the present application, Figure 2 It is a diagram of the exploded structure of a battery provided in one embodiment of the present application.

[0072] The present application provides a battery 1000. In this embodiment, a cylindrical battery is taken as an example. The battery 1000 includes a top cover assembly 100, a shell 200 and a core 300. The top cover assembly 100 is used to conduct the electrical energy inside the battery 1000 to the outside of the battery 1000. The shell 200 has a receiving cavity 201, and the core 300 is received in the receiving cavity 201 of the shell 200. After the core 300 is received in the shell 200 of the battery 1000, the top cover assembly 100 is used to encapsulate the receiving cavity of the shell 200, and the top cover assembly 100 is also electrically connected to the pole ear of the core 300 to achieve the overall packaging of the battery 1000.

[0073] See also Figures 2 to 6 , Figure 3 is an assembly structure diagram of a top cover assembly provided in the first embodiment of the present application, Figure 4 is an exploded structural diagram of a top cover assembly provided in the first embodiment of the present application, Figure 5 is a bottom view of a top cover assembly provided in the first embodiment of the present application, Figure 6 It is a front view of a top cover assembly provided in the first embodiment of the present application.

[0074] The top cover assembly 100 provided in the first embodiment of the present application is used to encapsulate the shell 200 of the battery 1000 to realize the assembly of the battery 1000. The top cover assembly 100 includes a cover plate 10, a pole 20 and a current collector 30. The cover plate 10 is covered on the shell 200 of the battery 1000 to encapsulate the winding core 300 in the shell 200 of the battery 1000. The pole 20 passes through the cover plate 10. The pole 20 is used to transmit the electric energy in the shell 200 of the battery 1000 to the outside of the battery 1000. The current collector 30 is used to electrically connect the pole ear of the winding core 300 and the pole 20, so that the battery 1000 is electrically connected to the load outside the battery 1000 through the pole 20.

[0075] In the top cover assembly 100 provided in the first embodiment of the present application, the cover plate 10 includes a first surface 10a and a second surface 10b arranged opposite to each other along a first direction, the first surface 10a is the surface of the cover plate 10 on the side facing away from the receiving cavity of the shell 200, and the second surface 10b is the surface of the cover plate 10 on the side facing the receiving cavity of the shell 200. The first direction is the height direction of the battery 1000. The pole 20 passes through the first surface 10a and the second surface 10b of the cover plate 10, one end of the pole 20 passing through the first surface 10a is used to be electrically connected to an external load, and one end of the pole 20 passing through the second surface 10b is used to be electrically connected to the pole lug of the winding core 300. The current collector 30 is arranged on one side of the second surface 10b of the cover plate 10, and the current collector 30 is used to electrically connect one end of the pole 20 passing through the second surface 10b with the pole lug of the winding core 300.

[0076] In the top cover assembly 100 provided in the first embodiment of the present application, the current collector 30 includes a first connection portion 31, a second connection portion 32 and a bending portion 33, and the first connection portion 31, the bending portion 33 and the second connection portion 32 are connected in sequence. The second connection portion 32 is bent relative to the first connection portion 31 through the bending portion 33, and the first surface 10a of the cover plate 10, the second surface 10b of the cover plate 10, the first connection portion 31 and the second connection portion 32 are arranged in sequence along the first direction, and the bending portion 33 is bent and connected to the edges of the first connection portion 31 and the second connection portion 32. The first connection portion 31 is electrically connected to one end of the pole 20 that passes through the second surface 10b of the cover plate 10, and the second connection portion 32 is electrically connected to the pole ear of the winding core 300, so that the electric energy inside the battery 1000 can be transmitted to the outside of the battery 1000.

[0077] In the top cover assembly 100 provided in the first embodiment of the present application, a first limiting portion 40 is provided on the second surface 10b of the cover plate 10, and a second limiting portion 50 is provided on the second connecting portion 32. The first limiting portion 40 cooperates with the second limiting portion 50 so that the second connecting portion 32 is fixed relative to the cover plate 10 after being bent relative to the first connecting portion 31.

[0078] The top cover assembly 100 provided in the first embodiment of the present application, on the one hand, is electrically connected to the pole 20 through the first connection portion 31 of the current collector 30, and the second connection portion 32 of the current collector 30 is bent relative to the first connection portion 31 through the bending portion 33 and is used to be electrically connected to the winding core 300 of the battery 1000, and the current collector 30 only needs to be bent once and can form an electrical connection between the winding core 300 and the pole 20. Since the current collector 30 is bent only once, the cumulative error of the current collector 30 is smaller, which can reduce the probability that the current collector 30 and the housing 200 of the battery 1000 are in conflict and the top cover assembly 100 and the housing 200 of the battery 1000 cannot be assembled. Moreover, the cumulative error of the current collector 30 is smaller, which can improve the concentricity of the top cover assembly 100 and the shell 200 of the battery 1000, making the gap between the top cover assembly 100 and the shell 200 of the battery 1000 more uniform, which is beneficial to improving the welding stability of the top cover assembly 100 and the shell 200 of the battery 1000. At the same time, since the current collector 30 is only bent once, the overall length of the current collector 30 is shorter and the resistance is smaller, which is beneficial to improving the current flow performance of the current collector 30. In addition, since the current collector 30 is only bent once, the overall proportion of the cover plate 10 in the height direction of the battery 1000 can be reduced, so that the design size of the core 300 in the height direction of the battery 1000 can be made larger, which is beneficial to the miniaturization and high energy density design of the battery 1000. On the other hand, the first limiting portion 40 on the second surface 10b of the cover plate 10 cooperates with the second limiting portion 50 on the second connection portion 32 to further limit the error caused by the bending of the second connection portion 32 relative to the first connection portion 31, which is conducive to improving the bending accuracy of the second connection portion 32 relative to the first connection portion 31, and can further reduce the probability of the top cover assembly 100 and the battery 1000 being unable to be assembled due to the conflict between the current collector 30 and the shell 200 of the battery 1000, and further improve the welding stability of the top cover assembly 100 and the shell 200 of the battery 1000. At the same time, the first limiting portion 40 on the second surface 10b of the cover plate 10 cooperates with the second limiting portion 50 on the second connection portion 32, and can also make the current collector 30 have the effects of anti-pull, anti-twist, anti-vibration dislocation, etc., whether it is during assembly or in later vibration conditions, so as to prevent the current collector 30 from being torn at the welding point with the pole ear of the winding core 300 due to displacement or vibration.

[0079] See also Figures 2 to 6In the top cover assembly 100 provided in the first embodiment of the present application, the first limiting portion 40 provided on the second surface 10b of the cover plate 10 includes a first limiting column 41 and a second limiting column 42, and the first limiting column 41 and the second limiting column 42 are provided on the second surface 10b at intervals. The second limiting portion 50 provided on the second connecting portion 32 includes a first limiting hole 51 and a second limiting hole 52, and the first limiting hole 51 and the second limiting hole 52 are provided on the second connecting portion 32 at intervals. When the second connecting portion 32 is bent relative to the first connecting portion 31, the first limiting column 41 cooperates with the first limiting hole 51, and the second limiting column 42 cooperates with the second limiting hole 52 to limit the angle and width of the second connecting portion 32 bending relative to the first connecting portion 31.

[0080] The top cover assembly 100 provided in the first embodiment of the present application, when the second connection part 32 is bent relative to the first connection part 31, the first limiting post 41 on the second surface 10b of the cover plate 10 cooperates with the first limiting hole 51 on the second connection part 32, and the second limiting post 42 on the second surface 10b cooperates with the second limiting hole 52 on the second connection part 32 to further limit the error amount caused by the bending of the second connection part 32 relative to the first connection part 31, which is beneficial to improve the bending accuracy of the second connection part 32 relative to the first connection part 31, that is, to improve the accuracy of the bending angle and width of the second connection part 32 relative to the first connection part 31, which can further reduce the probability of interference between the collector 30 and the aluminum shell and the inability to assemble the top cover assembly 100 and the battery 1000, and further improve the welding stability of the top cover assembly 100 and the aluminum shell. Moreover, the first limiting column 41 and the second limiting column 42 respectively cooperate with the first limiting hole 51 and the second limiting hole 52 to prevent the second connecting part 32 from rotating relative to the first connecting part 31 after being bent relative to the first connecting part 31 and causing circumferential error, thereby making the current collecting part 30 more stable after bending, which is beneficial to improving the stability of the current collecting part 30 electrically connecting the pole 20 and the winding core 300.

[0081] See also Figures 2 to 7 , Figure 7 It is a structural diagram of the first limiting column and the second limiting column provided in the first embodiment of the present application.

[0082] In the top cover assembly 100 provided in the first embodiment of the present application, the first limiting column 41 includes a first limiting section 411 and a second limiting section 412, one end of the second limiting section 412 is fixed to the second surface 10b, and the other end of the second limiting section 412 is fixedly connected to the first limiting section 411. The second limiting section 412 is coaxially arranged with the first limiting section 411, and the radial dimension of the second limiting section 412 is greater than the radial dimension of the first limiting section 411. The radial dimension of the first limiting hole 51 is greater than or equal to the radial dimension of the first limiting section 411, and the radial dimension of the first limiting hole 51 is less than the radial dimension of the second limiting section 412. The second limiting column 42 includes a third limiting section 421 and a fourth limiting section 422, one end of the fourth limiting section 422 is fixed to the second surface 10b, and the other end of the fourth limiting section 422 is fixedly connected to the third limiting section 421. The fourth limiting section 422 is coaxially arranged with the third limiting section 421, and the radial dimension of the fourth limiting section 422 is greater than the radial dimension of the third limiting section 421. The radial dimension of the second limiting hole 52 is greater than or equal to the radial dimension of the fourth limiting section 422, and the radial dimension of the second limiting hole 52 is smaller than the radial dimension of the fourth limiting section 422. When the second connection portion 32 is bent relative to the first connection portion 31, the first limiting section 411 is penetrated in the first limiting hole 51, the second limiting section 412 is abutted against the circumference of the first limiting hole 51, the third limiting section 421 is penetrated in the second limiting hole 52, and the fourth limiting section 422 is abutted against the circumference of the second limiting hole 52.

[0083] The top cover assembly 100 provided in the first embodiment of the present application is characterized in that the first limiting section 411 of the first limiting column 41 is provided with a first limiting hole 51 and cooperates with the first limiting hole 51, and the second limiting section 412 of the first limiting column 41 is abutted against the second connection portion 32. The third limiting section 421 of the second limiting column 42 is provided with a second limiting hole 52 and cooperates with the second limiting hole 52, and the fourth limiting section 422 of the second limiting column 42 is abutted against the second connection portion 32. It can prevent the second connection portion 32 from rotating relative to the first connection portion 31 after being bent relative to the first connection portion 31 and causing a circumferential error, and it can also prevent the second connection portion 32 from moving relative to the first connection portion 31 after being bent relative to the first connection portion 31 and causing an axial error, thereby making the current collector 30 more stable after being bent, which is beneficial to improving the stability of the current collector 30 electrically connecting the pole 20 and the winding core 300.

[0084] It is understandable that in some other embodiments, only the first limiting column 41 includes the first limiting section 411 and the second limiting section 412. When the second connection portion 32 is bent relative to the first connection portion 31, the first limiting section 411 is inserted into the first limiting hole 51, the second limiting section 412 is pressed against the circumference of the first limiting hole 51, and the second limiting column 42 is inserted into the second limiting hole 52. Such a design can also prevent the second connection portion 32 from rotating relative to the first connection portion 31 after being bent relative to the first connection portion 31 and causing a circumferential error, and prevent the second connection portion 32 from moving relative to the first connection portion 31 after being bent relative to the first connection portion 31 and causing an axial error, which is not limited by the present application.

[0085] It is understandable that in some other embodiments, only the second limiting column 42 includes the third limiting section 421 and the fourth limiting section 422. When the second connection portion 32 is bent relative to the first connection portion 31, the first limiting column 41 is inserted into the first limiting hole 51, the third limiting section 421 is inserted into the second limiting hole 52, and the fourth limiting section 422 is abutted against the circumference of the second limiting hole 52. Such a design can also prevent the second connection portion 32 from rotating relative to the first connection portion 31 after being bent relative to the first connection portion 31 and causing a circumferential error, and prevent the second connection portion 32 from moving relative to the first connection portion 31 after being bent relative to the first connection portion 31 and causing an axial error, which is not limited in the present application.

[0086] See also Figures 2 to 6 In the top cover assembly 100 provided in the first embodiment of the present application, a positioning member 60 is provided on the second surface 10b of the cover plate 10, and the positioning member 60 is used to limit the first connection portion 31. The positioning member 60 includes a first positioning portion 61 and a second positioning portion 62, and there is an angle between the first positioning portion 61 and the second positioning portion 62. The first connection portion 31 is clamped between the first positioning portion 61 and the second positioning portion 62 to limit the first connection portion 31 from rotating relative to the cover plate 10.

[0087] The top cover assembly 100 provided in the first embodiment of the present application is provided with a positioning member 60 on the second surface 10b of the cover plate 10. The first positioning portion 61 and the second positioning portion 62 of the positioning member 60 limit the first connection portion 31, which can prevent the first connection portion 31 from rotating relative to the pole 20 after being electrically connected to the pole 20, which is beneficial to improving the stability between the collector 30 electrically connected to the pole 20 and the winding core 300.

[0088] It can be understood that in some other embodiments, the positioning member 60 can be a convex column structure arranged on the second surface 10b of the cover plate 10, and a groove or a concave hole is arranged corresponding to the position of the first connecting portion 31. The convex column structure is inserted into the groove or the concave hole, which can also prevent the first connecting portion 31 from rotating relative to the pole 20 after being electrically connected to the pole 20, which is beneficial to improving the stability of the current collector 30 electrically connecting the pole 20 and the winding core 300. The present application does not impose any restrictions on this.

[0089] See also Figures 2 to 6 In the top cover assembly 100 provided in the first embodiment of the present application, the top cover assembly 100 further includes an explosion-proof valve 70. The cover plate 10 has a pressure relief hole 11, and the pressure relief hole 11 penetrates the first surface 10a and the second surface 10b. The explosion-proof valve 70 is arranged at one end of the pressure relief hole 11 close to the second surface 10b and is spaced from the pole 20. When the internal pressure of the battery 1000 increases abnormally, the explosion-proof valve 70 will automatically open to release the pressure inside the battery 1000 through the pressure relief hole 11.

[0090] The top cover assembly 100 provided in the first embodiment of the present application is provided with an explosion-proof valve 70 in the pressure relief hole 11 of the cover plate 10, and the pressure relief hole 11 penetrates the first surface 10a and the second surface 10b of the cover plate 10. When the internal pressure of the battery 1000 increases abnormally, the explosion-proof valve 70 will automatically open to release the internal pressure, which can prevent the battery 1000 formed by the top cover assembly 100 from generating overpressure or overheating under charging, discharging or abnormal working conditions and causing explosion. At the same time, the explosion-proof valve 70 is provided at one end of the pressure relief hole 11 close to the second surface 10b and is spaced from the pole 20, so that the explosion-proof valve 70 can sense and automatically open in time when the internal pressure of the battery 1000 is abnormal, thereby improving the sensitivity of the explosion-proof valve 70.

[0091] It is understandable that in some other embodiments, the explosion-proof valve 70 can be disposed at one end of the pressure relief hole 11 close to the first surface 10a, or at other positions in the pressure relief hole 11. When the internal pressure of the battery 1000 increases abnormally, the explosion-proof valve 70 will also automatically open to release the internal pressure, and the present application does not limit this.

[0092] See also Figures 2 to 6 In the top cover assembly 100 provided in the first embodiment of the present application, the top cover assembly 100 further includes a protective film 80, and the protective film 80 covers the opening of the pressure relief hole 11 near the first surface 10a. The protective film 80 includes but is not limited to a structure such as a tape, a filter, etc. that can prevent dust and other impurities in the environment from passing through.

[0093] The top cover assembly 100 provided in the first embodiment of the present application has an explosion-proof valve 70 disposed at one end of the pressure relief hole 11 close to the second surface 10b, and the first surface 10a of the cover plate 10 close to the pressure relief hole 11 is covered by a protective film 80. The explosion-proof valve 70 is disposed at the opening of one end of the pressure relief hole 11 close to the second surface 10b. The protective film 80 can prevent external dust and other impurities from passing through the pressure relief hole 11 and affecting the explosion-proof performance of the explosion-proof valve 70, which is beneficial to reducing the probability of failure of the explosion-proof valve 70.

[0094] It is understandable that in some other embodiments, the explosion-proof valve 70 itself can be designed with a dust cover, and the explosion-proof valve 70 can be arranged at one end of the pressure relief hole 11 close to the first surface 10a, and can also achieve dust-proof and explosion-proof functions. The present application does not impose any restrictions on this.

[0095] See also Figures 2 to 6 In the top cover assembly 100 provided in the first embodiment of the present application, the top cover assembly 100 is applied to a cylindrical battery as an example, that is, the cover plate 10 of the top cover assembly 100 is circular. The pole 20 passes through the mounting hole 12 on the cover plate 10 and is located at the center of the cover plate 10, the explosion-proof valve 70 passes through the pressure relief hole 11 on the cover plate 10 and deviates from the center of the cover plate 10, the mounting hole 12 and the pressure relief hole 11 are arranged at intervals, and the pole 20 and the explosion-proof valve 70 are arranged at intervals. The second connecting portion 32 is bent relative to the first connecting portion 31 in a direction away from the explosion-proof valve 70, and the explosion-proof valve 70 and the second connecting portion 32 are staggered along the first direction. In other words, the explosion-proof valve 70 is arranged on one side of the pole 20 in the radial direction of the cover plate 10, and the second connecting portion 32 is arranged on the other side of the pole 20 in the aforementioned radial direction of the cover plate 10, so that the explosion-proof valve 70 and the second connecting portion 32 are staggered in the height direction of the top cover assembly 100.

[0096] The top cover assembly 100 provided in the first embodiment of the present application has a cover plate 10 penetrated through the pole 20 and located at the center of the cover plate 10, and the explosion-proof valve 70 is arranged in the pressure relief hole 11 penetrated through the cover plate 10 and deviated from the center of the cover plate 10, and the second connection part 32 is bent relative to the first connection part 31 in a direction away from the explosion-proof valve 70, so that the second connection part 32 and the explosion-proof valve 70 are staggered along the first direction. In this way, the overlap between the second connection part 32 and the explosion-proof valve 70 can be avoided, and the risk of overlap corrosion between the current collector 30 and the explosion-proof valve can be reduced.

[0097] See also Figures 2 to 6 In the top cover assembly 100 provided in the first embodiment of the present application, the first limiting portion 40 is disposed on the side of the pole 20 away from the explosion-proof valve 70, and the second limiting portion 50 is disposed on the side of the second connecting portion 32 away from the bending portion 33. The first limiting portion 40 is a limiting column protruding from the second surface 10b, and the second limiting portion 50 is a notch disposed on the side of the second connecting portion 32 away from the bending portion 33.

[0098] The top cover assembly 100 provided in the first embodiment of the present application is provided with a first limiting portion 40 disposed on the side of the pole 20 away from the explosion-proof valve 70, and a second limiting portion 50 disposed on the side of the second connection portion 32 away from the bending portion 33. When the second connection portion 32 is bent relative to the first connection portion 31 toward the side away from the explosion-proof valve 70, the side of the second connection portion 32 away from the bending portion 33 is further away from the explosion-proof valve 70 than the side of the second connection portion 32 connected to the bending portion 33. Thus, the first limiting portion 40 on the second surface 10b of the cover plate 10 is convenient for matching with the second limiting portion 50 on the second connection portion 32. Moreover, the second limiting portion 50 is a notch on the side of the second connection portion 32 away from the bending portion 33, so that the first limiting portion 40 is penetrated into the second limiting portion 50 and forms a limiting match.

[0099] It can be understood that in some other embodiments, the first limiting portion 40 can be a groove arranged on the second surface 10b of the cover plate 10, and the second limiting portion 50 can be a convex column arranged on the side of the second connecting portion 32 facing the cover plate 10. When the second connecting portion 32 is bent relative to the first connecting portion 31, the first limiting portion 40 can also cooperate with the second limiting portion 50 to limit the position. The present application does not impose any restrictions on this.

[0100] See also Figures 2 to 6 In the top cover assembly 100 provided in the first embodiment of the present application, the current collecting part 30 is integrally formed, the cover plate 10 is circular, the second connecting part 32 is fan-shaped, and the center of the circle where the cover plate 10 is located and the center of the circle where the second connecting part 32 is located are arranged opposite to each other along the first direction to increase the contact area between the second connecting part 32 and the winding core 300.

[0101] The top cover assembly 100 provided in the first embodiment of the present application is circular through the cover plate 10, the pole 20 passes through the cover plate 10 and is located at the center of the cover plate 10, and the explosion-proof valve 70 is arranged in the pressure relief hole 11 passing through the cover plate 10 and deviates from the center of the cover plate 10. When the second connection part 32 is bent relative to the first connection part 31 in the direction away from the explosion-proof valve 70 through the bending part 33, since the second connection part 32 is fan-shaped, and the center of the circle where the periphery of the cover plate 10 is located and the center of the circle where the periphery of the second connection part 32 is located are arranged relative to each other along the first direction, the area of ​​the welding area between the second connection part 32 of the current collector 30 and the winding core 300 can be increased to increase the conductivity of the current collector 30, thereby increasing the energy density of the battery 1000 formed by the cover plate 10. Moreover, the current collector 30 is integrally formed to make the processing effect of the current collector 30 better and the processing speed faster, which is conducive to saving the material of the current collector 30 and the cost of welding and assembling the current collector 30.

[0102] See also Figures 2 to 6In the top cover assembly 100 provided in the first embodiment of the present application, a stopper 90 is provided on the second surface 10b of the cover plate 10. The stopper 90 is provided on the side of the pole 20 close to the explosion-proof valve 70. The stopper 90 is used to abut against the winding core 300 of the battery 1000.

[0103] The top cover assembly 100 provided in the first embodiment of the present application is provided with a stopper 90 through the second surface 10b of the cover plate 10. The stopper 90 is provided on the side of the pole 20 close to the explosion-proof valve 70 so that the stopper 90 can abut against the winding core 300 of the battery 1000, thereby limiting the movement of the winding core 300 in the battery 1000, thereby improving the stability of the winding core 300 in the battery 1000.

[0104] See also Figures 2 to 6 In the top cover assembly 100 provided in the first embodiment of the present application, the bending portion 33 includes a first opening 331 and a second opening 332 , and the first opening 331 and the second opening 332 are arranged on opposite sides of the bending portion 33 along the width direction of the current collecting member 30 .

[0105] The top cover assembly 100 provided in the first embodiment of the present application includes a first opening 331 and a second opening 332 that are relatively arranged along the width direction of the current collecting part 30 through the bending portion 33. During the bending process of the bending portion 33, the first opening 331 and the second opening 332 are used to guide the bending direction of the bending portion 33, which can reduce the bending error of the current collecting part 30 so that the bending accuracy of the bending portion 33 is greater, which is beneficial to improving the overall accuracy of the current collecting part 30 after bending, and further facilitates the cover plate 10 to package the battery 1000.

[0106] See also Figure 2 , Figure 8 and Fig. 9 , Figure 8 is a bottom view of a top cover assembly provided in the second embodiment of the present application before being bent. Fig. 9 This is a bottom view of a top cover assembly provided in the second embodiment of the present application after being bent.

[0107] The second embodiment of the present application provides a top cover assembly 100, which is substantially the same as the top cover assembly 100 provided in the first embodiment of the present application, except that the current collecting part 30 of the top cover assembly 100 provided in the second embodiment of the present application is different from the current collecting part 30 of the top cover assembly 100 provided in the first embodiment of the present application.

[0108] In the top cover assembly 100 provided in the second embodiment of the present application, the second connection portion 32 of the current collector 30 includes a transition portion 321 and a current collector 322, and the first connection portion 31, the bending portion 33 and the transition portion 321 are sequentially arranged in an integrated structure. The current collector 322 is circular, the current collector 322 is welded to the transition portion 321, the current collector 322 is connected to one end of the transition portion 321 away from the bending portion 33, and the position where the transition portion 321 is connected to the current collector 322 is located on the side of the current collector 322 facing the cover plate 10.

[0109] The top cover assembly 100 provided in the second embodiment of the present application includes a transition portion 321 and a current collecting portion 322 through the second connecting portion 32, and the current collecting portion 322 is circular, and the transition portion 321 is connected to the side of the current collecting portion 322 facing the cover plate 10, so as to further reduce the length of the first connecting portion 31 and the bending portion 33, thereby making the overall length of the current collecting member 30 shorter and the resistance smaller, which is conducive to improving the current flow performance of the current collecting member 30. Moreover, since the current collecting portion 322 is circular and the pole 20 is arranged at the center of the cover plate 10, the area of ​​the current collecting portion 322 will be reduced, which can reduce the difficulty of welding between the current collecting portion 322 and the winding core 300.

[0110] It should be understood that, due to the reduction in the area of ​​the current collecting part 322, the contact area between the current collecting part 30 and the winding core 300 will become smaller. In order to ensure the current flow performance of the current collecting part 30, it is necessary to increase the thickness of the current collecting part 322. The increase or decrease in thickness can be calculated according to the formula: P = J × S × t, where P is the current flow capacity (A), J is the current density (A / mm2), S is the cross-sectional area (mm2), and t is the thickness (mm). When P and J remain unchanged, the product of S and t of the circular current collecting part 322 remains unchanged to ensure the current flow performance.

[0111] See also Figure 2 and Fig.10 , Fig.10 It is a bottom view of the first top cover assembly provided in the third embodiment of the present application.

[0112] The third embodiment of the present application provides a top cover assembly 100, which is substantially the same as the top cover assembly 100 provided in the first embodiment of the present application, except that the pole 20 insertion position of the top cover assembly 100 provided in the third embodiment of the present application is different from the pole 20 insertion position of the top cover assembly 100 provided in the first embodiment of the present application.

[0113] In the top cover assembly 100 provided in the third embodiment of the present application, the top cover assembly 100 is applied to a cylindrical battery as an example, that is, the cover plate 10 of the top cover assembly 100 is circular. The pole 20 passes through the cover plate 10 and deviates from the center of the cover plate 10, and the explosion-proof valve 70 passes through the cover plate 10 and deviates from the center of the cover plate 10. The second connecting portion 32 is bent relative to the first connecting portion 31 in the direction close to the explosion-proof valve 70, and the explosion-proof valve 70 and the second connecting portion 32 are opposite and spaced apart along the first direction. In other words, the explosion-proof valve 70 is arranged on one side of the pole 20 in the radial direction of the cover plate 10, and the second connecting portion 32 is arranged on the same side of the pole 20 in the aforementioned radial direction of the cover plate 10, so that the explosion-proof valve 70 and the second connecting portion 32 are arranged relative to each other in the height direction of the top cover assembly 100.

[0114] The top cover assembly 100 provided in the third embodiment of the present application is provided with a cover plate 10 through the pole 20 and deviates from the center of the cover plate 10, and the explosion-proof valve 70 is provided through the cover plate 10 and deviates from the center of the cover plate 10, so that the spacing distance between the pole 20 and the explosion-proof valve 70 can be made larger, which is convenient for subsequent processing of the pole 20. At the same time, since both the pole 20 and the explosion-proof valve 70 deviate from the center position of the cover plate 10, the cover plate 10 has more design space, which is convenient for adding identification codes and other designs on the cover plate 10. Moreover, since the pole 20 passes through the cover plate 10 and deviates from the center of the cover plate 10, the length of the first connecting portion 31 can be made shorter and the area of ​​the second connecting portion 32 can be made larger, which is conducive to reducing the bending length of the current collector 30 and increasing the contact area between the current collector 30 and the winding core 300, thereby making the overall length of the current collector 30 shorter and the resistance smaller, which is conducive to improving the current flow performance of the current collector 30.

[0115] See also Figure 2 and Fig.11 , Fig.11 It is a bottom view of the second top cover assembly provided in the third embodiment of the present application.

[0116] In the top cover assembly 100 provided in the third embodiment of the present application, the first limiting portion 40 is arranged on the side of the pole 20 close to the explosion-proof valve 70, and the second limiting portion 50 is arranged on the side of the second connecting portion 32 away from the bending portion 33. The first limiting portion 40 is a limiting column protruding from the second surface 10b, and the second limiting portion 50 is a notch arranged on the side of the second connecting portion 32 away from the bending portion 33.

[0117] The top cover assembly 100 provided in the third embodiment of the present application is provided with a first limiting portion 40 on a side of the pole 20 close to the explosion-proof valve 70, and a second limiting portion 50 is provided on a side of the second connection portion 32 away from the bending portion 33. The first limiting portion 40 and the second portion cooperate to limit the error amount caused by the bending of the second connection portion 32 relative to the first connection portion 31, which is beneficial to improve the bending accuracy of the second connection portion 32 relative to the first connection portion 31, and can further reduce the probability of interference between the collector 30 and the aluminum shell and the inability to assemble the top cover assembly 100 and the battery 1000, thereby further improving the welding stability of the top cover assembly 100 and the aluminum shell. At the same time, the first limiting portion 40 on the second surface 10b of the cover plate 10 cooperates with the second limiting portion 50 on the second connecting portion 32, so that the current collecting component 30 can have the effects of anti-pulling, anti-twisting, and anti-vibration dislocation during assembly or in later vibration conditions, thereby preventing the current collecting component 30 from tearing at the welding point with the pole ear of the winding core 300 due to displacement or vibration.

[0118] It can be understood that in some other embodiments, the first limiting portion 40 can be a groove arranged on the second surface 10b of the cover plate 10, and the second limiting portion 50 can be a convex column arranged on the side of the second connecting portion 32 facing the cover plate 10. When the second connecting portion 32 is bent relative to the first connecting portion 31, the first limiting portion 40 can also cooperate with the second limiting portion 50 to limit the position. The present application does not impose any restrictions on this.

[0119] See also Figure 2 and Fig.11 In the top cover assembly 100 provided in the third embodiment of the present application, the second connecting portion 32 is provided with a connecting hole 323, and the connecting hole 323 penetrates the second connecting portion 32 along the first direction. The connecting hole 323 is used to connect the receiving cavity of the shell 200 of the battery 1000 with the pressure relief hole 11 of the cover plate 10.

[0120] The top cover assembly 100 provided in the third embodiment of the present application is provided with a connecting hole 323 penetrating the second connecting part 32 along the first direction through the second connecting part 32, so that the accommodating space of the pole core is connected with the pressure relief hole 11 accommodating the explosion-proof valve 70 through the connecting hole 323, so that the explosion-proof valve 70 can automatically open when the internal pressure of the battery 1000 increases abnormally to release the internal pressure, and can prevent the battery 1000 formed by the top cover assembly 100 from generating overpressure or overheating and causing explosion during charging, discharging or abnormal operating conditions.

[0121] See also Figure 2 and Fig.11 In the top cover assembly 100 provided in the third embodiment of the present application, the cover plate 10 is circular, the second connecting portion 32 is circular, and the center of the circle where the cover plate 10 is located and the center of the circle where the second connecting portion 32 is located are arranged opposite to each other along the first direction.

[0122] The top cover assembly 100 provided in the third embodiment of the present application is circular in shape through the periphery of the cover plate 10, the periphery of the second connection portion 32 is circular, and the center of the circle where the periphery of the cover plate 10 is located and the center of the circle where the periphery of the second connection portion 32 is located are arranged relative to each other along the first direction, thereby, the area of ​​the second connection portion 32 can be made larger, which is conducive to increasing the area of ​​welding between the second connection portion 32 and the winding core 300 and improving the stability of welding between the second connection portion 32 and the winding core 300, thereby improving the flow performance of the current collector 30. At the same time, since the area of ​​the second connection portion 32 can be made larger, the contact area between the current collector 30 and the winding core 300 will become larger, and while ensuring the flow performance of the current collector 30, the thickness of the second connection portion 32 can be appropriately reduced. The increase or decrease of thickness can be calculated according to the formula: P = J × S × t, where P is the flow capacity (A), J is the current density (A / mm2), S is the cross-sectional area (mm2), and t is the thickness (mm). When P and J remain unchanged, the flow performance can be guaranteed by ensuring that the product of S and t of the circular current collecting portion 322 remains unchanged. Since the thickness of the second connecting portion 32 can be appropriately reduced, it is beneficial to further reduce the proportion of the current collecting member 30 and the top cover assembly 100 in the height direction of the battery 1000, thereby providing a larger space for designing the winding core 300, so as to increase the capacity of the battery 1000 under the premise of the same external size range.

[0123] See also Fig.11 In the top cover assembly 100 provided in the first embodiment of the present application, the bending portion 33 includes a first bending line 333 and a second bending line 334, and the first bending line 333 and the second bending line 334 are arranged on opposite sides of the bending portion 33 along the length direction of the current collector 30. The first bending line 333 contacts the pole 20, and the second bending line 334 contacts the second connecting portion 32. The first bending line 333 and the second bending line 334 can be groove structures.

[0124] The top cover assembly 100 provided in the first embodiment of the present application includes a first bending line 333 and a second bending line 334 extending along the width direction of the current collector 30 through a bending portion 33, the first bending line 333 is in contact with the pole 20, and the second bending line 334 is in contact with the second connecting portion 32, so that when the second bending portion 33 of the current collector 30 is bent relative to the first bending portion 33, the area where the bending occurs only occurs in the bending portion 33, and will not affect the flatness of the first connecting portion and the second connecting portion 32, which is beneficial to further improve the bending accuracy of the current collector 30.

[0125] See also Figures 1 to 11, based on the top cover assembly 100 provided by the first embodiment, the second embodiment and the third embodiment of the present application, the battery 1000 formed by the top cover assembly 100, on the one hand, because the current collector 30 is bent only once, the cumulative error of the current collector 30 is smaller, which can reduce the probability that the current collector 30 and the shell 200 of the battery 1000 are in conflict and the top cover assembly 100 and the shell 200 of the battery 1000 cannot be assembled. Moreover, the cumulative error of the current collector 30 is smaller, which can improve the concentricity of the top cover assembly 100 and the shell 200 of the battery 1000, so that the gap between the top cover assembly 100 and the shell 200 of the battery 1000 is more uniform, which is conducive to improving the welding stability of the top cover assembly 100 and the shell 200 of the battery 1000. At the same time, since the current collector 30 is bent only once, the overall length of the current collector 30 is shorter and the resistance is smaller, which is conducive to improving the current flow performance of the current collector 30, and then improving the current flow performance of the battery 1000 outputting electric energy. In addition, since the current collector 30 is bent only once, the overall proportion of the cover plate 10 in the height direction of the shell 200 of the battery 1000 can be reduced, so that the design size of the winding core 300 of the battery 1000 in the height direction of the battery 1000 can be made larger, which is conducive to the miniaturization and high energy density design of the battery 1000. On the other hand, the first limiting portion 40 on the second surface 10b of the cover plate 10 cooperates with the second limiting portion 50 on the second connection portion 32 to further limit the error caused by the bending of the second connection portion 32 relative to the first connection portion 31, which is beneficial to improving the bending accuracy of the second connection portion 32 relative to the first connection portion 31, and can further reduce the probability of interference between the collector 30 and the shell 200 of the battery 1000, thereby making it impossible to assemble the top cover assembly 100 and the battery 1000, and further improve the welding stability between the top cover assembly 100 and the shell 200 of the battery 1000. At the same time, the first limiting portion 40 on the second surface 10b of the cover plate 10 cooperates with the second limiting portion 50 on the second connecting portion 32, so that the current collector 30 can have the effects of anti-pulling, anti-twisting, and anti-vibration dislocation during assembly or in later vibration conditions. This can prevent the current collector 30 from tearing at the welding point with the pole ear of the winding core 300 of the battery 1000 due to displacement or vibration, thereby improving the stability of the battery 1000.

[0126] See also Figures 1 to 11Based on the battery 1000 formed by the top cover assembly 100 provided in the first embodiment, the second embodiment and the third embodiment of the present application, the energy storage device provided in the embodiment of the present application includes the battery 1000. The energy storage device includes the above-mentioned battery 1000. On the one hand, since the battery 1000 can be miniaturized and designed with high energy density, it is convenient for miniaturization and high energy density design of the energy storage device. On the other hand, the welding stability of the battery 1000 is high, so that the stability of the energy storage device is high.

[0127] The above are some implementation methods of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. A top cover assembly for packaging a battery, characterized in that: include: The cover plate comprises a first surface and a second surface which are arranged opposite to each other along a first direction; A pole, passing through the first surface and the second surface; as well as a current collecting member, disposed on one side of the second surface of the cover plate; In which, the current collecting part includes a first connecting part, a bending part and a second connecting part which are connected in sequence, the first connecting part is electrically connected to the pole, and the second connecting part is bent relative to the first connecting part; a first limiting part is arranged on the second surface, a second limiting part is arranged on the second connecting part, and the first limiting part cooperates with the second limiting part.

2. The top cover assembly according to claim 1, characterized in that The first limiting portion includes a first limiting column and a second limiting column, and the first limiting column and the second limiting column are arranged on the second surface at an interval; The second limiting portion includes a first limiting hole and a second limiting hole, and the first limiting hole and the second limiting hole are arranged at intervals on the second connecting portion; The first limiting column cooperates with the first limiting hole, and the second limiting column cooperates with the second limiting hole.

3. The top cover assembly according to claim 2, characterized in that: The first limiting column includes a first limiting section and a second limiting section, one end of the second limiting section is fixed to the second surface, and the other end of the second limiting section is fixedly connected to the first limiting section; the second limiting section is coaxially arranged with the first limiting section, and the radial dimension of the second limiting section is larger than the radial dimension of the first limiting section; the radial dimension of the first limiting hole is larger than or equal to the radial dimension of the first limiting section, and the radial dimension of the first limiting hole is smaller than the radial dimension of the second limiting section; and / or; The second limiting column includes a third limiting section and a fourth limiting section, one end of the fourth limiting section is fixed to the second surface, and the other end of the fourth limiting section is fixedly connected to the third limiting section; the fourth limiting section is coaxially arranged with the third limiting section, and the radial dimension of the fourth limiting section is greater than the radial dimension of the third limiting section; the radial dimension of the second limiting hole is greater than or equal to the radial dimension of the fourth limiting section, and the radial dimension of the second limiting hole is smaller than the radial dimension of the fourth limiting section.

4. The top cover assembly according to claim 1, characterized in that: The second surface is provided with a positioning piece, and the positioning piece is used to limit the first connecting portion.

5. The top cover assembly according to claim 1, characterized in that: The top cover assembly also includes an explosion-proof valve. The cover plate is provided with a pressure relief hole, and the pressure relief hole runs through the first surface and the second surface. The explosion-proof valve is arranged at one end of the pressure relief hole close to the second surface and is spaced apart from the pole.

6. The top cover assembly according to claim 5, characterized in that: The top cover assembly also includes a protective film, which covers the opening of the pressure relief hole close to the first surface.

7. The top cover assembly according to claim 5, characterized in that: The pole passes through the cover plate and is located at the center of the cover plate, and the explosion-proof valve passes through the cover plate and deviates from the center of the cover plate; the second connecting portion is bent relative to the first connecting portion in a direction away from the explosion-proof valve, and the explosion-proof valve and the second connecting portion are staggered along the first direction.

8. The top cover assembly according to claim 7, characterized in that: The first limiting portion is arranged on a side of the pole away from the explosion-proof valve, and the second limiting portion is arranged on a side of the second connecting portion away from the bending portion.

9. The top cover assembly according to claim 7, characterized in that: The current collecting member is integrally formed, the cover plate is circular, the second connecting portion is fan-shaped, and the center of the circle where the cover plate is located and the center of the circle where the second connecting portion is located are arranged opposite to each other along the first direction.

10. The top cover assembly according to claim 7, characterized in that: The second connecting portion includes a transition portion and a collecting portion, and the first connecting portion, the bending portion and the transition portion are arranged in sequence to form an integrated structure; the collecting portion is circular, and the collecting portion is connected to one end of the transition portion away from the bending portion, and the position where the transition portion is connected to the collecting portion is located on the side of the collecting portion facing the cover plate.

11. The top cover assembly according to claim 7, characterized in that: The second surface of the cover plate is provided with a stopper, the stopper is arranged on a side of the pole close to the explosion-proof valve, and the stopper is used to abut against the winding core of the battery.

12. The top cover assembly according to claim 5, characterized in that: The pole passes through the cover plate and deviates from the center of the cover plate, and the explosion-proof valve passes through the cover plate and deviates from the center of the cover plate; the second connecting portion is bent relative to the first connecting portion in a direction close to the explosion-proof valve, and the explosion-proof valve and the second connecting portion are opposite to each other and spaced apart along the first direction.

13. The top cover assembly according to claim 12, wherein: The first limiting portion is arranged on a side of the pole close to the explosion-proof valve, and the second limiting portion is arranged on a side of the second connecting portion away from the bending portion.

14. The top cover assembly according to claim 12, wherein: The second connection portion is provided with a communication hole, and the communication hole penetrates the second connection portion along the first direction.

15. The top cover assembly according to claim 12, wherein: The cover plate is circular, the second connection portion is circular, and the center of the circle where the cover plate is located and the center of the circle where the second connection portion is located are arranged opposite to each other along the first direction.

16. The top cover assembly according to claim 12, wherein: The bending portion includes a first opening and a second opening, and the first opening and the second opening are arranged at opposite sides of the bending portion along a width direction of the current collecting member.

17. The top cover assembly according to claim 12, wherein: The bending portion comprises a first bending line and a second bending line, wherein the first bending line and the second bending line are arranged at opposite sides of the bending portion along the length direction of the current collecting member; The first bending line contacts the pole, and the second bending line contacts the second connecting portion.

18. A battery, characterized in that: include: A housing having a receiving cavity; A winding core, accommodated in the accommodating cavity; as well as A top cover assembly as claimed in any one of claims 1 to 17; Wherein, the top cover assembly is used to encapsulate the shell; the pole of the top cover assembly, the current collecting part of the top cover assembly and the winding core are electrically connected in sequence.

19. An energy storage device, characterized in that: include: The battery as claimed in claim 18.

Images