Top cover assembly, battery and energy storage device

Abstract

The application 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 collector. The cover plate comprises a first surface and a second surface which are oppositely arranged along a first direction. The pole penetrates the first surface and the second surface. The current collector is arranged on one side of the second surface of the cover plate. The current collector comprises a first connecting portion, a bending portion and a second connecting portion which are sequentially connected. The first connecting portion is electrically connected with the pole. The second connecting portion is bent relative to the first connecting portion. A first limiting portion is arranged on the second surface. A second limiting portion is arranged on the second connecting portion. The first limiting portion cooperates with the second limiting portion. The top cover assembly and the battery provided by the application can reduce the cumulative error of the folded current collector and improve the folding precision of the current collector.

Description

Technical Field

[0001] This 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 Technology

[0002] In the prior art, the current collector of the top cover assembly needs to be folded twice to form a Z-shaped structure before the center of the battery cover can be aligned with the center of the core, thus enabling the assembly of the top cover assembly and the battery body.

[0003] However, the cumulative error of the current collector increases after multiple folds. During the assembly of the top cover assembly and the battery body, the current collector is prone to rubbing against the inner wall of the aluminum shell, forming metal wires. These wires can come into contact with the core, causing a short circuit. When the cumulative error of the current collector is even greater, it may even cause the current collector to come into contact with the aluminum shell, making it impossible to assemble the top cover assembly with the battery body. Moreover, the greater the cumulative error after multiple folds, the more likely the top cover assembly and the aluminum shell will be out of concentricity, resulting in uneven gaps between them and potentially affecting the welding stability. Additionally, after multiple folds, the current collector becomes longer and has higher resistance, which can affect its current carrying capacity. Furthermore, multiple folds increase the proportion of the battery cover in the height direction of the battery body, limiting the design dimensions in the height direction of the core and hindering battery miniaturization design. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this application provides a top cover assembly, a battery, and an energy storage device that can reduce the cumulative error after folding the current collector and improve the folding accuracy of the current collector.

[0005] On one hand, this application provides a top cover assembly for encapsulating a battery, characterized in that it comprises:

[0006] The cover plate includes a first surface and a second surface disposed opposite to each other along a first direction;

[0007] The pole post passes through the first surface and the second surface; and

[0008] A flow collector is disposed on one side of the second surface of the cover plate;

[0009] The current collector includes a first connecting part, a bent part, and a second connecting part connected in sequence. The first connecting part is electrically connected to the pole post, and the second connecting part is bent relative to the first connecting part. A first limiting part is provided on the second surface, and a second limiting part is provided on the second connecting part. The first limiting part and the second limiting part cooperate with each other.

[0010] The top cover assembly provided in this application embodiment is electrically connected to the terminal post via a first connecting portion of the current collector. The second connecting portion of the current collector is bent relative to the first connecting portion and used for electrical connection with the battery core. The current collector only needs to be bent once to form an electrical connection between the core and the terminal post. Because the current collector is bent only once, the cumulative error of the current collector is smaller, reducing the probability of contact between the current collector and the battery casing, thus preventing the assembly of the top cover assembly and the battery body. Furthermore, the smaller cumulative error of the current collector improves the concentricity of the top cover assembly and the battery casing, resulting in a more uniform gap between them, which is beneficial for improving the welding stability of the top cover assembly and the battery casing. Simultaneously, because the current collector is bent only once, its overall length is shorter and its resistance is lower, which is beneficial for improving the current-carrying performance of the current collector. Additionally, because the current collector is bent only once, the proportion of the battery cover plate in the height direction of the battery can be reduced, allowing for a larger design dimension of the core in the height direction of the battery, which is beneficial for battery miniaturization and high energy density design. On the other hand, by having the first limiting part on the second surface of the cover plate cooperate with the second limiting part on the second connecting part, the error caused by the bending of the second connecting part relative to the first connecting part is further limited. This helps to improve the bending accuracy of the second connecting part relative to the first connecting part, and can further reduce the probability of the current collector and the battery casing coming into contact, thus preventing the assembly of the top cover assembly and the battery body from being completed. This further improves the welding stability of the top cover assembly and the battery casing. At the same time, the cooperation between the first limiting part on the second surface of the cover plate and the second limiting part on the second connecting part also enables the current collector to have anti-pull, anti-torsion, and anti-vibration misalignment effects, whether during assembly or under conditions such as vibration. This can prevent the current collector from tearing at the electrode tab weld joint of the winding core due to displacement or vibration.

[0011] In one possible implementation, the first limiting portion includes a first limiting post and a second limiting post, the first limiting post and the second limiting post being disposed at a distance from each other on the second surface; the second limiting portion includes a first limiting hole and a second limiting hole, the first limiting hole and the second limiting hole being disposed at a distance from each other on the second connecting portion; the first limiting post cooperates with the first limiting hole, and the second limiting post cooperates with the second limiting hole.

[0012] The top cover assembly provided in this application embodiment uses a first limiting post on the second surface of the cover plate that engages with a first limiting hole on the second connecting portion, and a second limiting post on the second surface that engages with a second limiting hole on the second connecting portion. This further limits the error caused by the bending of the second connecting portion relative to the first connecting portion, which helps improve the bending accuracy of the second connecting portion relative to the first connecting portion. It also reduces the probability of the current collector and the aluminum shell forming contact, preventing the assembly of the top cover assembly and the battery body from failing, and further improves the welding stability of the top cover assembly and the aluminum shell. Furthermore, the first and second limiting posts engage with the first and second limiting holes respectively to prevent the second connecting portion from rotating relative to the first connecting portion after bending, thus preventing circumferential errors. This results in better stability of the current collector after bending, which helps improve the stability of the current collector's electrical connection to the terminal post and the winding core.

[0013] In one possible implementation, the first limiting post includes a first limiting segment and a second limiting segment, one end of the second limiting segment is fixed to the second surface, and the other end of the second limiting segment is fixedly connected to the first limiting segment; the second limiting segment and the first limiting segment are coaxially arranged, and the radial dimension of the second limiting segment is greater than the radial dimension of the first limiting segment; the radial dimension of the first limiting hole is greater than or equal to the radial dimension of the first limiting segment, and the radial dimension of the first limiting hole is less than the radial dimension of the second limiting segment; and / or; the second limiting post includes a third limiting segment and a fourth limiting segment, one end of the fourth limiting segment is fixed to the second surface, and the other end of the fourth limiting segment is fixedly connected to the third limiting segment; the fourth limiting segment and the third limiting segment are coaxially arranged, and the radial dimension of the fourth limiting segment is greater than the radial dimension of the third limiting segment; the radial dimension of the second limiting hole is greater than or equal to the radial dimension of the fourth limiting segment, and the radial dimension of the second limiting hole is less than the radial dimension of the fourth limiting segment.

[0014] The top cover assembly provided in this application embodiment has a first limiting segment of a first limiting post passing through and engaging with a first limiting hole, and a second limiting segment of the first limiting post abutting against a second connecting portion; and / or, a third limiting segment of the second limiting post passing through and engaging with a second limiting hole, and a fourth limiting segment of the second limiting post abutting against a second connecting portion; this can prevent circumferential errors caused by the second connecting portion rotating relative to the first connecting portion after bending, and also prevent axial errors caused by the second connecting portion moving relative to the first connecting portion after bending, thereby improving the stability of the current collector after bending, which is beneficial to improving the stability of the current collector's electrical connection pole and the winding core.

[0015] In one possible implementation, the second surface is provided with a positioning element for limiting the first connecting portion.

[0016] The top cover assembly provided in this application embodiment has a positioning element provided on the second surface of the cover plate. The positioning element 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, thus improving the stability of the current collector's electrical connection between the pole and the core.

[0017] In one possible implementation, the top cover assembly further includes an explosion-proof valve, the cover plate having a pressure relief hole that penetrates the first surface and the second surface; the explosion-proof valve is disposed at one end of the pressure relief hole near the second surface and spaced apart from the pole post.

[0018] The top cover assembly provided in this application embodiment has an explosion-proof valve disposed within the pressure relief hole of the cover plate, and the pressure relief hole penetrates through the first and second surfaces of the cover plate. When the internal pressure of the battery abnormally increases, the explosion-proof valve will automatically open to release the internal pressure, preventing the battery formed by the top cover assembly from exploding due to overpressure or overheating during charging, discharging, or abnormal operating conditions. Simultaneously, the explosion-proof valve is located at the end of the pressure relief hole near the second surface and spaced apart from the terminal post, allowing the explosion-proof valve to promptly sense and automatically open when the internal pressure of the battery is abnormal, thereby improving the sensitivity of the explosion-proof valve.

[0019] In one possible implementation, the top cover assembly further includes a protective film that covers the opening of the pressure relief hole near the first surface.

[0020] The top cover assembly provided in this application embodiment covers the first surface of the pressure relief hole near the cover plate with a protective film. The explosion-proof valve is set at the opening of the pressure relief hole near the second surface. The protective film can prevent external dust and other impurities from affecting the explosion-proof performance of the explosion-proof valve through the pressure relief hole, which helps to reduce the probability of explosion-proof valve failure.

[0021] In one 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 is offset 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 offset along the first direction.

[0022] The top cover assembly provided in this application embodiment has a pole passing through a cover plate and located at the center of the cover plate. An explosion-proof valve is disposed within a pressure relief hole passing through the cover plate and offset from the center of the cover plate. Furthermore, the second connecting portion is bent relative to the first connecting portion in a direction away from the explosion-proof valve, so that the second connecting portion and the explosion-proof valve are misaligned along a first direction. This avoids overlap between the second connecting portion and the explosion-proof valve, thereby reducing the risk of corrosion due to overlap between the manifold and the explosion-proof valve.

[0023] In one possible implementation, the first limiting part is disposed on the side of the pole opposite to the explosion-proof valve, and the second limiting part is disposed on the side of the second connecting part opposite to the bent part.

[0024] The top cover assembly provided in this application embodiment has a first limiting part disposed on the side of the pole opposite to the explosion-proof valve, and a second limiting part disposed on the side of the second connecting part opposite to the bending part. When the second connecting part bends relative to the first connecting part toward the side opposite to the explosion-proof valve, the side of the second connecting part opposite to the bending part is further away from the explosion-proof valve than the side of the second connecting part connected to the bending part. This facilitates the engagement of the first limiting part on the second surface of the cover plate with the second limiting part on the second connecting part.

[0025] In one possible implementation, the manifold is integrally formed, the cover plate is circular, the second connecting portion is fan-shaped, and the center of the circle containing the cover plate and the center of the circle containing the second connecting portion are arranged opposite to each other along the first direction.

[0026] The top cover assembly provided in this application embodiment has a circular cover plate, with the terminal post passing through the cover plate and located at the center of the cover plate. The explosion-proof valve is disposed in the pressure relief hole passing through the cover plate and is offset from the center of the cover plate. When the second connecting part is bent relative to the first connecting part in a direction away from the explosion-proof valve through the bending part, since the second connecting part is fan-shaped and the center of the circle containing the periphery of the cover plate and the center of the circle containing the periphery of the second connecting part are arranged opposite to each other in a first direction, the area of ​​the welding area between the second connecting part of the current collector and the core can be increased, thereby increasing the conductivity of the current collector and thus increasing the energy density of the battery formed by the battery cover plate. Moreover, the current collector is integrally formed, which makes the processing effect of the current collector better and the processing speed faster, which helps to save the material of the current collector and the cost of welding and assembly of the current collector.

[0027] In one possible implementation, 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 as an integral 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 this application includes a transition portion and a current collector portion via a second connecting portion. The current collector portion is circular, and the transition portion is connected to the side of the current collector portion facing the cover plate. This further reduces the length of the first connecting portion and the bending portion, thereby making the overall length of the current collector shorter and the resistance lower, which is beneficial to improving the current carrying performance of the current collector. Moreover, since the current collector portion is circular and the electrode post passes through the center of the cover plate, the area of ​​the current collector portion is reduced, which can reduce the welding difficulty between the current collector portion and the core.

[0029] In one possible implementation, the second surface of the cover plate is provided with a stop member, which is located on the side of the pole near the explosion-proof valve and is used to abut against the battery core.

[0030] The top cover assembly provided in this application embodiment has a stop member provided on the second surface of the cover plate. The stop member is provided on the side of the pole near the explosion-proof valve so that the stop member can abut against the battery core, which can restrict the movement of the core in the battery and thus improve the stability of the core in the battery.

[0031] In one possible implementation, the pole passes through the cover plate and is offset from the center of the cover plate, and the explosion-proof valve passes through the cover plate and is offset 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 arranged opposite to and spaced apart from each other along the first direction.

[0032] The top cover assembly provided in this application embodiment has a pole passing through the cover plate and offset from the center of the cover plate, and an explosion-proof valve passing through the cover plate and offset from the center of the cover plate. This allows for a larger gap between the pole and the explosion-proof valve, facilitating subsequent processing of the pole. Simultaneously, because both the pole and the explosion-proof valve are offset from the center of the cover plate, the cover plate has more design space, making it easier to add designs such as identification codes. Furthermore, because the pole passes through the cover plate and is offset from the center, the length of the first connecting part can be shorter, and the area of ​​the second connecting part can be larger. This helps reduce the bending length of the current collector and increase the contact area between the current collector and the winding core, resulting in a shorter overall length and lower resistance for the current collector, thus improving its current-carrying performance.

[0033] In one possible implementation, the first limiting part is disposed on the side of the pole near the explosion-proof valve, and the second limiting part is disposed on the side of the second connecting part away from the bent part.

[0034] The top cover assembly provided in this application embodiment has a first limiting part disposed on the side of the electrode post near the explosion-proof valve, and a second limiting part disposed on the side of the second connecting part away from the bending part. The first limiting part and the second limiting part cooperate to limit the error caused by the bending of the second connecting part relative to the first connecting part, which helps to improve the bending accuracy of the second connecting part relative to the first connecting part. This can further reduce the probability that the current collector and the aluminum shell will collide, making it impossible to assemble the top cover assembly with the battery body, and further improve the welding stability of the top cover assembly and the aluminum shell. At the same time, the cooperation between the first limiting part on the second surface of the cover plate and the second limiting part on the second connecting part can also enable the current collector to have anti-pull, anti-torsion, and anti-vibration misalignment effects during assembly and subsequent use under vibration and other operating conditions. This can prevent the current collector from tearing at the electrode tab weld of the winding core due to displacement or vibration.

[0035] In one possible implementation, the second connecting portion is provided with a communicating hole, which extends through the second connecting portion along the first direction.

[0036] The top cover assembly provided in this application embodiment has a connecting hole through the second connecting part in the first direction, so that the receiving space of the electrode core is connected to the pressure relief hole of the receiving explosion-proof valve through the connecting hole, so that the explosion-proof valve can automatically open when the internal pressure of the battery rises abnormally, release the internal pressure, and prevent the battery formed by the top cover assembly from exploding due to overpressure or overheating during charging, discharging or abnormal operating conditions.

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

[0038] The top cover assembly provided in this application embodiment has a circular periphery for both the cover plate and the second connecting portion. The center of the circle containing the periphery of the cover plate and the center of the circle containing the periphery of the second connecting portion are arranged opposite each other along a first direction. As a result, the area of ​​the second connecting portion can be made larger, which is beneficial to increasing the welding area between the second connecting portion and the core and improving the stability of the welding between the second connecting portion and the core, thereby improving the current carrying performance of the current collector.

[0039] In one possible implementation, the bending portion includes a first opening and a second opening, the first opening and the second opening being disposed on opposite sides of the bending portion along the width direction of the current collector.

[0040] The top cover assembly provided in this application includes a first opening and a second opening that are disposed opposite to each other along the width direction of the current collector in the 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 collector and make the bending accuracy of the bending portion greater. This is beneficial to improving the overall accuracy of the current collector after bending, and thus facilitates the battery cover plate to encapsulate the battery.

[0041] In one possible implementation, the bending portion includes a first bending line and a second bending line, the first bending line and the second bending line being disposed on opposite sides of the bending portion along the length direction of the current collector; the first bending line is in contact with the pole post, and the second bending line is in contact with the second connecting portion.

[0042] The top cover assembly provided in this application embodiment includes a first bending line and a second bending line extending along the width direction of the current collector in the bending portion. The first bending line contacts the pole post, and the second bending line contacts the second connecting portion. This ensures that during the process of the second bending portion of the current collector relative to the first bending portion, the bending occurs only in the bending portion and does not affect the flatness of the first and second connecting portions, which is beneficial to further improving the bending accuracy of the current collector.

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

[0044] The shell has a receiving cavity;

[0045] The core is housed within the receiving cavity; and

[0046] The aforementioned top cover assembly;

[0047] The top cover assembly is used to encapsulate the housing; the pole, the current collector, and the winding core of the top cover assembly are electrically connected in sequence.

[0048] The battery provided in this application embodiment, by including the aforementioned top cover assembly, offers several advantages. Firstly, because the current collector is bent only once, its cumulative error is smaller, reducing the probability of the current collector and battery casing colliding and preventing assembly of the top cover assembly and battery casing. Secondly, the smaller cumulative error of the current collector improves the concentricity of the top cover assembly and battery casing, resulting in a more uniform gap between them and enhancing welding stability. Thirdly, the shorter overall length and lower resistance of the current collector, due to its single bend, improve its current-carrying performance, thereby enhancing the battery's output power. Finally, the single bend reduces the proportion of the battery cover in the battery casing's height direction, allowing for a larger design dimension of the battery core in that direction, facilitating miniaturization and high-energy-density battery design. On the other hand, by cooperating with the first limiting part on the second surface of the cover plate and the second limiting part on the second connecting part, the error caused by the bending of the second connecting part relative to the first connecting part is further limited. This helps to improve the bending accuracy of the second connecting part relative to the first connecting part, and can further reduce the probability of the current collector and the battery casing coming into contact, thus preventing the assembly of the top cover assembly and the battery body from being completed. This further improves the welding stability of the top cover assembly and the battery casing. At the same time, the cooperation between the first limiting part on the second surface of the cover plate and the second limiting part on the second connecting part also enables the current collector to have anti-pull, anti-torsion, and anti-vibration misalignment effects, whether during assembly or under conditions such as vibration. This can prevent the current collector from tearing at the electrode tab weld of the battery core due to displacement or vibration, thereby improving the stability of the battery.

[0049] Furthermore, this application also provides an energy storage device, comprising:

[0050] The aforementioned battery.

[0051] The energy storage device provided in this application includes the aforementioned battery. On one hand, the battery allows for miniaturization and high energy density design, which in turn facilitates the miniaturization and high energy density design of the energy storage device. On the other hand, the battery exhibits high welding stability, thereby enhancing the stability of the energy storage device. Attached Figure Description

[0052] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are merely some implementation methods provided by the embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

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

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

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

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

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

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

[0060] Figure 8 This is a bottom view of a top cover assembly provided in the second embodiment of this application before bending;

[0061] Figure 9 This is a bottom view of a top cover assembly after bending, provided in the second embodiment of this application;

[0062] Figure 10 This is a bottom view of the first type of top cover assembly provided in the third embodiment of this application;

[0063] Figure 11 This is a bottom view of the second type of top cover assembly provided in the third embodiment of this application.

[0064] The symbols in the attached image are explained as follows:

[0065] Battery-1000, Top cover assembly-100, Cover plate-10, First surface-10a, Second surface-10b, Pressure relief hole-11, Mounting hole-12, Terminal post-20, Current collector-30, First connecting part-31, Second connecting 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 Position part-40, first limiting post-41, first limiting segment-411, second limiting segment-412, second limiting post-42, third limiting segment-421, fourth limiting segment-422, second limiting part-50, first limiting hole-51, second limiting hole-52, positioning element-60, first positioning part-61, second positioning part-62, explosion-proof valve-70, protective film-80, stop element-90, housing-200, receiving cavity-201, core-300. Detailed Implementation

[0066] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0067] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or it can be in a component in between. When a component is described as "mounted to" another component, it can be directly on the other component or it can be in a component in between. When a component is described as "connected to" another component, it can be directly connected to the other component or it can be in a component in between.

[0068] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terminology used in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items. Directional terms mentioned in the description of this application, such as "upper," "lower," "front," "rear," "left," "right," "inner," "outer," "top surface," "side surface," "bottom surface," "top wall," "side wall," "bottom wall," "inner side wall," "outer side wall," "length direction," "width direction," "height direction," etc., are merely for reference to the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of this application, and do not indicate or imply that the referred device or element must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the application. In the description of this application, terms such as "first," "second," "third," "fourth," etc., are only used to distinguish the described objects and do not have any sequential or technical meaning.

[0069] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0070] This application provides an energy storage device, which includes a battery. The battery includes, but is not limited to, battery modules, battery packs, battery clusters, energy storage stations, etc., and this application does not impose any limitations on this.

[0071] Please see Figure 1 and Figure 2 , Figure 1 This is an assembly structure diagram of a battery provided in one embodiment of this application. Figure 2 This is an exploded structural diagram of a battery provided in one embodiment of this application.

[0072] This application provides a battery 1000. This embodiment uses a cylindrical battery as an example. The battery 1000 includes a top cover assembly 100, a housing 200, and a winding core 300. The top cover assembly 100 is used to conduct electrical energy from inside the battery 1000 to the outside of the battery 1000. The housing 200 has a receiving cavity 201, and the winding core 300 is housed within the receiving cavity 201 of the housing 200. After the winding core 300 is housed within the battery 1000 housing 200, the top cover assembly 100 encapsulates the receiving cavity of the housing 200, and the top cover assembly 100 is also electrically connected to the tabs of the winding core 300 to achieve overall encapsulation of the battery 1000.

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

[0074] The top cover assembly 100 provided in the first embodiment of this application is used to encapsulate the housing 200 of the battery 1000 to realize the assembly of the battery 1000. The top cover assembly 100 includes a cover plate 10, a terminal post 20, and a current collector 30. The cover plate 10 covers the housing 200 of the battery 1000 to encapsulate the winding core 300 inside the housing 200 of the battery 1000. The terminal post 20 passes through the cover plate 10 and is used to transmit electrical energy inside the housing 200 of the battery 1000 to the outside of the battery 1000. The current collector 30 is used to electrically connect the tabs of the winding core 300 and the terminal post 20 so that the battery 1000 is electrically connected to a load outside the battery 1000 through the terminal post 20.

[0075] In the top cover assembly 100 provided in the first embodiment of this application, the cover plate 10 includes a first surface 10a and a second surface 10b disposed opposite to each other along a first direction. The first surface 10a is the surface of the cover plate 10 facing away from the receiving cavity of the housing 200, and the second surface 10b is the surface of the cover plate 10 facing the receiving cavity of the housing 200. The first direction is the height direction of the battery 1000. A terminal post 20 passes through the first surface 10a and the second surface 10b of the cover plate 10. One end of the terminal post 20 passing through the first surface 10a is used for electrical connection to an external load, and one end of the terminal post 20 passing through the second surface 10b is used for electrical connection to the tab of the winding core 300. A current collector 30 is disposed on one side of the second surface 10b of the cover plate 10, and the current collector 30 is used for electrically connecting the end of the terminal post 20 passing through the second surface 10b to the tab of the winding core 300.

[0076] In the top cover assembly 100 provided in the first embodiment of this application, the current collector 30 includes a first connecting portion 31, a second connecting portion 32, and a bending portion 33, which are sequentially connected. The second connecting portion 32 is bent relative to the first connecting portion 31 by the bending portion 33. The first surface 10a, the second surface 10b, the first connecting portion 31, and the second connecting portion 32 of the cover plate 10 are sequentially arranged along a first direction, and the bending portion 33 is bent and connected to the edges of the first connecting portion 31 and the second connecting portion 32. The first connecting portion 31 is electrically connected to one end of the electrode post 20 that passes through the second surface 10b of the cover plate 10, and the second connecting portion 32 is electrically connected to the tab of the winding core 300, so that the electrical energy inside the battery 1000 can be delivered to the outside of the battery 1000.

[0077] In the top cover assembly 100 provided in the first embodiment of this application, a first limiting part 40 is provided on the second surface 10b of the cover plate 10, and a second limiting part 50 is provided on the second connecting part 32. The first limiting part 40 and the second limiting part 50 cooperate to fix the second connecting part 32 relative to the cover plate 10 after bending relative to the first connecting part 31.

[0078] The top cover assembly 100 provided in the first embodiment of this application is electrically connected to the terminal post 20 via the first connecting portion 31 of the current collector 30. The second connecting portion 32 of the current collector 30 is bent relative to the first connecting portion 31 via the bending portion 33 and is used for electrical connection with the core 300 of the battery 1000. The current collector 30 only needs to be bent once to form an electrical connection between the core 300 and the terminal post 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 will collide and fail to assemble the top cover assembly 100 with the housing 200 of the battery 1000. Furthermore, the smaller cumulative error of the current collector 30 improves the concentricity of the top cover assembly 100 and the battery 1000 housing 200, resulting in a more uniform gap between them and improving welding stability. Simultaneously, because the current collector 30 is bent only once, its overall length is shorter, resulting in lower resistance and improved current-carrying performance. Additionally, the single-bend design reduces the proportion of the cover plate 10 in the height direction of the battery 1000, allowing for a larger design dimension of the core 300 in this direction, facilitating miniaturization and high-energy-density design of the battery 1000. On the other hand, by cooperating with the first limiting part 40 on the second surface 10b of the cover plate 10 and the second limiting part 50 on the second connecting part 32, the error caused by the bending of the second connecting part 32 relative to the first connecting part 31 is further limited. This helps to improve the bending accuracy of the second connecting part 32 relative to the first connecting part 31, and can further reduce the probability that the current collector 30 and the housing 200 of the battery 1000 will come into contact, thus preventing the assembly of the top cover assembly 100 and the battery 1000. This further improves the welding stability of the top cover assembly 100 and the housing 200 of the battery 1000. At the same time, the cooperation between the first limiting part 40 on the second surface 10b of the cover plate 10 and the second limiting part 50 on the second connecting part 32 can also make the current collector 30 have anti-pull, anti-torsion, and anti-vibration misalignment effects during assembly or later use under vibration and other working conditions. This can prevent the current collector 30 from tearing at the electrode tab weld of the core 300 due to displacement or vibration.

[0079] Please see Figures 2 to 6In the top cover assembly 100 provided in the first embodiment of this application, the first limiting portion 40 disposed on the second surface 10b of the cover plate 10 includes a first limiting post 41 and a second limiting post 42, which are disposed at intervals on the second surface 10b. The second limiting portion 50 disposed on the second connecting portion 32 includes a first limiting hole 51 and a second limiting hole 52, which are disposed at intervals on the second connecting portion 32. When the second connecting portion 32 is bent relative to the first connecting portion 31, the first limiting post 41 engages with the first limiting hole 51, and the second limiting post 42 engages with the second limiting hole 52, thereby limiting the angle and width of the bending of the second connecting portion 32 relative to the first connecting portion 31.

[0080] The top cover assembly 100 provided in the first embodiment of this application, when the second connecting part 32 is bent relative to the first connecting 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 connecting part 32, and the second limiting post 42 on the second surface 10b cooperates with the second limiting hole 52 on the second connecting part 32, so as to further limit the amount of error caused by the bending of the second connecting part 32 relative to the first connecting part 31. This is beneficial to improve the bending accuracy of the second connecting part 32 relative to the first connecting part 31, that is, to improve the accuracy of the bending angle and width of the second connecting part 32 relative to the first connecting part 31. This can further reduce the probability that the current collector 30 and the aluminum shell will form a collision and fail 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. Furthermore, the first limiting post 41 and the second limiting post 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 bending, thus causing circumferential error. This makes the current collector 30 more stable after bending, which is beneficial to improving the stability of the current collector 30's electrical connection to the pole post 20 and the core 300.

[0081] Please see Figures 2 to 7 , Figure 7 This is a structural diagram of the first limiting post and the second limiting post provided in the first embodiment of this application.

[0082] In the top cover assembly 100 provided in the first embodiment of this application, the first limiting post 41 includes a first limiting segment 411 and a second limiting segment 412. One end of the second limiting segment 412 is fixed to the second surface 10b, and the other end of the second limiting segment 412 is fixedly connected to the first limiting segment 411. The second limiting segment 412 is coaxially arranged with the first limiting segment 411, and the radial dimension of the second limiting segment 412 is greater than the radial dimension of the first limiting segment 411. The radial dimension of the first limiting hole 51 is greater than or equal to the radial dimension of the first limiting segment 411, and the radial dimension of the first limiting hole 51 is less than the radial dimension of the second limiting segment 412. The second limiting post 42 includes a third limiting segment 421 and a fourth limiting segment 422. One end of the fourth limiting segment 422 is fixed to the second surface 10b, and the other end of the fourth limiting segment 422 is fixedly connected to the third limiting segment 421. The fourth limiting segment 422 is coaxially arranged with the third limiting segment 421, and the radial dimension of the fourth limiting segment 422 is greater than that of the third limiting segment 421. The radial dimension of the second limiting hole 52 is greater than or equal to the radial dimension of the fourth limiting segment 422, and the radial dimension of the second limiting hole 52 is less than that of the fourth limiting segment 422. When the second connecting portion 32 is bent relative to the first connecting portion 31, the first limiting segment 411 passes through the first limiting hole 51, the second limiting segment 412 abuts against the periphery of the first limiting hole 51, the third limiting segment 421 passes through the second limiting hole 52, and the fourth limiting segment 422 abuts against the periphery of the second limiting hole 52.

[0083] The top cover assembly 100 provided in the first embodiment of this application has a first limiting segment 411 of a first limiting post 41 passing through and engaging with a first limiting hole 51, and a second limiting segment 412 of the first limiting post 41 abutting against a second connecting portion 32. A third limiting segment 421 of the second limiting post 42 passes through and engages with a second limiting hole 52, and a fourth limiting segment 422 of the second limiting post 42 abuts against a second connecting portion 32. This design prevents circumferential errors caused by the second connecting portion 32 rotating relative to the first connecting portion 31 after bending, and also prevents axial errors caused by the second connecting portion 32 moving relative to the first connecting portion 31 after bending. This results in better stability of the current collector 30 after bending, which is beneficial for improving the stability of the current collector 30's electrical connection to the electrode post 20 and the core 300.

[0084] Understandably, in some other embodiments, only the first limiting post 41 includes a first limiting segment 411 and a second limiting segment 412. When the second connecting portion 32 is bent relative to the first connecting portion 31, the first limiting segment 411 passes through the first limiting hole 51, the second limiting segment 412 abuts against the periphery of the first limiting hole 51, and the second limiting post 42 passes through the second limiting hole 52. This design can also prevent the second connecting portion 32 from rotating relative to the first connecting portion 31 after bending relative to the first connecting portion 31, thus preventing circumferential errors, and prevent the second connecting portion 32 from moving relative to the first connecting portion 31 after bending relative to the first connecting portion 31, thus preventing axial errors. This application does not limit the comparison.

[0085] Understandably, in some other embodiments, only the second limiting post 42 includes a third limiting segment 421 and a fourth limiting segment 422. When the second connecting portion 32 is bent relative to the first connecting portion 31, the first limiting post 41 passes through the first limiting hole 51, the third limiting segment 421 passes through the second limiting hole 52, and the fourth limiting segment 422 abuts against the periphery of the second limiting hole 52. This design can also prevent the second connecting portion 32 from rotating relative to the first connecting portion 31 after bending relative to the first connecting portion 31, thus preventing circumferential errors, and prevent the second connecting portion 32 from moving relative to the first connecting portion 31 after bending relative to the first connecting portion 31, thus preventing axial errors. This application does not limit the comparison.

[0086] Please see Figures 2 to 6 In the top cover assembly 100 provided in the first embodiment of this application, a positioning member 60 is provided on the second surface 10b of the cover plate 10. The positioning member 60 is used to limit the first connecting portion 31. The positioning member 60 includes a first positioning portion 61 and a second positioning portion 62. The first positioning portion 61 and the second positioning portion 62 have an included angle. The first connecting portion 31 is engaged between the first positioning portion 61 and the second positioning portion 62 to restrict the first connecting portion 31 from rotating relative to the cover plate 10.

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

[0088] Understandably, in some other embodiments, the positioning member 60 can be a protruding pillar structure or the like provided on the second surface 10b of the cover plate 10, and a groove or recess is provided at the position corresponding to the first connecting part 31. The protruding pillar structure passes through the groove or recess, which can also prevent the first connecting part 31 from rotating relative to the pole post 20 after it is electrically connected to the pole post 20. This is beneficial to improving the stability of the current collector 30 electrically connecting the pole post 20 and the core 300. This application does not limit this.

[0089] Please see Figures 2 to 6 In the top cover assembly 100 provided in the first embodiment of this application, the top cover assembly 100 further includes an explosion-proof valve 70. The cover plate 10 has a pressure relief hole 11, which penetrates the first surface 10a and the second surface 10b. The explosion-proof valve 70 is disposed at the end of the pressure relief hole 11 near the second surface 10b and spaced apart from the terminal post 20. Wherein, when the internal pressure of the battery 1000 abnormally increases, the explosion-proof valve 70 will automatically open to release the internal pressure of the battery 1000 through the pressure relief hole 11.

[0090] The top cover assembly 100 provided in the first embodiment of this application has an explosion-proof valve 70 disposed within 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 abnormally increases, the explosion-proof valve 70 automatically opens to release the internal pressure, which can prevent the battery 1000 formed by the top cover assembly 100 from overpressure or overheating and causing an explosion under charging, discharging or abnormal operating conditions. At the same time, the explosion-proof valve 70 is disposed at the end of the pressure relief hole 11 near the second surface 10b and spaced apart from the terminal post 20, which allows the explosion-proof valve 70 to sense and automatically open in a timely manner when the internal pressure of the battery 1000 is abnormal, thereby improving the sensitivity of the explosion-proof valve 70.

[0091] Understandably, in some other embodiments, the explosion-proof valve 70 may be located at one end of the pressure relief hole 11 near the first surface 10a, or at another location within the pressure relief hole 11. When the internal pressure of the battery 1000 rises abnormally, the explosion-proof valve 70 will also automatically open to release the internal pressure, and this application does not limit this.

[0092] Please see Figures 2 to 6 In the top cover assembly 100 provided in the first embodiment of this application, the top cover assembly 100 further includes a protective film 80, which covers the opening of the pressure relief hole 11 near the first surface 10a. The protective film 80 includes, but is not limited to, structures such as tape or a filter screen that can block dust and other impurities in the environment from passing through.

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

[0094] It is understood that in some other embodiments, the explosion-proof valve 70 can be designed with a dust cover, and the explosion-proof valve 70 can be set at the end of the pressure relief hole 11 near the first surface 10a, which can also achieve dustproof and explosion-proof functions. This application does not limit this.

[0095] Please see Figures 2 to 6 In the first embodiment of this application, the top cover assembly 100 is used in a cylindrical battery, meaning the cover plate 10 of the top cover assembly 100 is circular. The terminal post 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 is offset from the center of the cover plate 10. The mounting hole 12 and the pressure relief hole 11 are spaced apart, and the terminal post 20 and the explosion-proof valve 70 are spaced apart. 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 offset along a first direction. In other words, the explosion-proof valve 70 is located on one side of the terminal post 20 in the radial direction of the cover plate 10, and the second connecting portion 32 is located on the other side of the terminal post 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 offset in the height direction of the top cover assembly 100.

[0096] The top cover assembly 100 provided in the first embodiment of this application has a pole post 20 passing through a cover plate 10 and located at the center of the cover plate 10. An explosion-proof valve 70 is disposed within a pressure relief hole 11 passing through the cover plate 10 and offset from the center of the cover plate 10. Furthermore, the second connecting portion 32 is bent relative to the first connecting portion 31 in a direction away from the explosion-proof valve 70, so that the second connecting portion 32 and the explosion-proof valve 70 are misaligned along a first direction. This avoids overlapping between the second connecting portion 32 and the explosion-proof valve 70, thereby reducing the risk of lap corrosion between the manifold 30 and the explosion-proof valve.

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

[0098] The top cover assembly 100 provided in the first embodiment of this application has a first limiting part 40 disposed on the side of the pole post 20 away from the explosion-proof valve 70, and a second limiting part 50 disposed on the side of the second connecting part 32 away from the bending part 33. When the second connecting part 32 bends relative to the first connecting part 31 toward the side away from the explosion-proof valve 70, the side of the second connecting part 32 away from the bending part 33 is further away from the explosion-proof valve 70 than the side of the second connecting part 32 connected to the bending part 33. This facilitates the engagement of the first limiting part 40 on the second surface 10b of the cover plate 10 with the second limiting part 50 on the second connecting part 32. Furthermore, the second limiting part 50 is a notch on the side of the second connecting part 32 away from the bending part 33, so that the first limiting part 40 can pass through the second limiting part 50 and form a limiting engagement.

[0099] Understandably, in some other embodiments, the first limiting part 40 can be a groove provided on the second surface 10b of the cover plate 10, and the second limiting part 50 can be a protrusion provided on the side of the second connecting part 32 facing the cover plate 10. When the second connecting part 32 is bent relative to the first connecting part 31, the first limiting part 40 can also be limited and cooperated with the second limiting part 50. This application does not limit this.

[0100] Please see Figures 2 to 6 In the top cover assembly 100 provided in the first embodiment of this application, the current collector 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 core 300.

[0101] The top cover assembly 100 provided in the first embodiment of this application has a circular cover plate 10, an electrode post 20 passing through the cover plate 10 and located at the center of the cover plate 10, and an explosion-proof valve 70 disposed in the pressure relief hole 11 passing through the cover plate 10 and offset from the center of the cover plate 10. When the second connecting part 32 is bent relative to the first connecting part 31 in a direction away from the explosion-proof valve 70 by the bending part 33, since the second connecting part 32 is fan-shaped and the center of the circle containing the periphery of the cover plate 10 and the center of the circle containing the periphery of the second connecting part 32 are arranged opposite to each other in a first direction, the area of ​​the welding area between the second connecting part 32 of the current collector 30 and the core 300 can be increased, thereby increasing the conductivity of the current collector 30 and thus increasing the energy density of the battery 1000 formed by the cover plate 10. Moreover, the current collector 30 is integrally formed, so that the processing effect of the current collector 30 is better and the processing speed is faster, which helps to save the material of the current collector 30 and the cost of welding and assembly of the current collector 30.

[0102] Please see Figures 2 to 6In the top cover assembly 100 provided in the first embodiment of this application, a stop member 90 is provided on the second surface 10b of the cover plate 10. The stop member 90 is provided on the side of the pole post 20 near the explosion-proof valve 70, and the stop member 90 is used to abut against the core 300 of the battery 1000.

[0103] The top cover assembly 100 provided in the first embodiment of this application has a stop member 90 provided on the second surface 10b of the cover plate 10. The stop member 90 is provided on the side of the pole post 20 near the explosion-proof valve 70 so that the stop member 90 can abut against the core 300 of the battery 1000, thereby restricting the movement of the core 300 in the battery 1000 and improving the stability of the core 300 in the battery 1000.

[0104] Please see Figures 2 to 6 In the top cover assembly 100 provided in the first embodiment of this application, the bending portion 33 includes a first opening 331 and a second opening 332, which are disposed on opposite sides of the bending portion 33 along the width direction of the collector 30.

[0105] The top cover assembly 100 provided in the first embodiment of this application includes a first opening 331 and a second opening 332 arranged opposite to each other along the width direction of the current collector 30 in 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 collector 30 and make the bending accuracy of the bending portion 33 greater. This is beneficial to improving the overall accuracy of the current collector 30 after bending, and thus facilitates the cover plate 10 to encapsulate the battery 1000.

[0106] Please see Figure 2 , Figure 8 and Figure 9 , Figure 8 This is a bottom view of a top cover assembly provided in the second embodiment of this application before bending. Figure 9 This is a bottom view of a top cover assembly after bending, provided in the second embodiment of this application.

[0107] The second embodiment of this application provides a top cover assembly 100, which is substantially the same as the top cover assembly 100 provided in the first embodiment of this application. The difference is that the current collector 30 of the top cover assembly 100 provided in the second embodiment of this application is the same as the current collector 30 of the top cover assembly 100 provided in the first embodiment of this application.

[0108] In the top cover assembly 100 provided in the second embodiment of this application, the second connecting portion 32 of the current collector 30 includes a transition portion 321 and a current collector 322. The first connecting portion 31, the bending portion 33, and the transition portion 321 are sequentially arranged in an integral structure. The current collector 322 is circular and is welded to the transition portion 321. The current collector 322 is connected to the end of the transition portion 321 away from the bending portion 33. The connection position between the transition portion 321 and 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 this application includes a transition portion 321 and a current collector 322 via a second connecting portion 32. The current collector 322 is circular, and the transition portion 321 is connected to the side of the current collector 322 facing the cover plate 10, thereby further reducing the length of the first connecting portion 31 and the bending portion 33. This results in a shorter overall length and lower resistance for the current collector 30, which is beneficial for improving the current carrying performance of the current collector 30. Moreover, since the current collector 322 is circular and the pole post 20 passes through the center of the cover plate 10, the area of ​​the current collector 322 is reduced, which can reduce the welding difficulty between the current collector 322 and the core 300.

[0110] It is important to understand that, due to the reduced area of ​​the current collector 322, the contact area between the current collector 30 and the core 300 will decrease. To ensure the current-carrying performance of the current collector 30, the thickness of the current collector 322 needs to be increased. The increase or decrease in thickness can be calculated using the formula: P = J × S × t, where P is the current-carrying capacity (A), J is the current density (A / mm2), S is the cross-sectional area (mm2), and t is the thickness (mm). With P and J remaining constant, the current-carrying performance can be guaranteed by keeping the product of S and t of the circular current collector 322 constant.

[0111] Please see Figure 2 and Figure 10 , Figure 10 This is a bottom view of the first type of top cover assembly provided in the third embodiment of this application.

[0112] The third embodiment of this application provides a top cover assembly 100. The top cover assembly 100 provided in the third embodiment of this application is generally the same as the top cover assembly 100 provided in the first embodiment of this application. The difference is that the position of the pole post 20 in the top cover assembly 100 provided in the third embodiment of this application is different from the position of the pole post 20 in the top cover assembly 100 provided in the first embodiment of this application.

[0113] In the top cover assembly 100 provided in the third embodiment of this application, taking the application of the top cover assembly 100 in a cylindrical battery as an example, that is, the cover plate 10 of the top cover assembly 100 is circular. The terminal post 20 passes through the cover plate 10 and is offset from the center of the cover plate 10, and the explosion-proof valve 70 passes through the cover plate 10 and is offset from the center of the cover plate 10. The second connecting portion 32 is bent relative to the first connecting portion 31 in a direction close to the explosion-proof valve 70, and the explosion-proof valve 70 and the second connecting portion 32 are arranged opposite to each other and spaced apart along a first direction. In other words, the explosion-proof valve 70 is disposed on one side of the terminal post 20 in the radial direction of the cover plate 10, and the second connecting portion 32 is disposed on the same side of the terminal post 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 opposite 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 this application has a pole post 20 passing through the cover plate 10 and offset from the center of the cover plate 10, and an explosion-proof valve 70 passing through the cover plate 10 and offset from the center of the cover plate 10. This allows for a larger gap between the pole post 20 and the explosion-proof valve 70, facilitating subsequent processing of the pole post 20. Simultaneously, since both the pole post 20 and the explosion-proof valve 70 are offset from the center of the cover plate 10, the cover plate 10 has more design space, making it easier to add designs such as identification codes. Furthermore, because the pole post 20 passes through the cover plate 10 and is offset from the center, the length of the first connecting portion 31 can be shorter, and the area of ​​the second connecting portion 32 can be larger. This helps to reduce the bending length of the current collector 30 and increase the contact area between the current collector 30 and the winding core 300, resulting in a shorter overall length and lower resistance for the current collector 30, thus improving its current-carrying performance.

[0115] Please see Figure 2 and Figure 11 , Figure 11 This is a bottom view of the second type of top cover assembly provided in the third embodiment of this application.

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

[0117] The top cover assembly 100 provided in the third embodiment of this application has a first limiting part 40 disposed on the side of the pole post 20 near the explosion-proof valve 70, and a second limiting part 50 disposed on the side of the second connecting part 32 away from the bending part 33. The first limiting part 40 and the second part cooperate to limit the amount of error caused by the bending of the second connecting part 32 relative to the first connecting part 31. This helps to improve the bending accuracy of the second connecting part 32 relative to the first connecting part 31, and can further reduce the probability that the current collector 30 and the aluminum shell will form a collision and fail 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. Meanwhile, the first limiting part 40 on the second surface 10b of the cover plate 10 cooperates with the second limiting part 50 on the second connecting part 32, which can also make the current collector 30 have the effects of anti-pull, anti-torsion, and anti-vibration misalignment during assembly or during subsequent use under vibration and other working conditions. This can prevent the current collector 30 from tearing at the electrode lug weld of the core 300 due to displacement or vibration.

[0118] Understandably, in some other embodiments, the first limiting part 40 can be a groove provided on the second surface 10b of the cover plate 10, and the second limiting part 50 can be a protrusion provided on the side of the second connecting part 32 facing the cover plate 10. When the second connecting part 32 is bent relative to the first connecting part 31, the first limiting part 40 can also be limited and cooperated with the second limiting part 50. This application does not limit this.

[0119] Please see Figure 2 and Figure 11 In the top cover assembly 100 provided in the third embodiment of this application, the second connecting part 32 is provided with a connecting hole 323. The connecting hole 323 penetrates the second connecting part 32 along the first direction and is used to connect the receiving cavity of the housing 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 this application has a connecting hole 323 extending through the second connecting part 32 in a first direction, so that the receiving space of the electrode core is connected to the pressure relief hole 11 of the receiving 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 rises abnormally, release the internal pressure, and prevent the battery 1000 formed by the top cover assembly 100 from over-pressure or overheating and causing an explosion under charging, discharging or abnormal operating conditions.

[0121] Please see Figure 2 and Figure 11 In the top cover assembly 100 provided in the third embodiment of this application, the cover plate 10 is circular, the second connecting part 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 part 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 this application has a circular periphery for both the cover plate 10 and the second connecting portion 32. The centers of the circles containing the periphery of the cover plate 10 and the second connecting portion 32 are positioned opposite each other along a first direction. This allows for a larger area of ​​the second connecting portion 32, which improves the welding area between the second connecting portion 32 and the core 300, as well as the stability of the welding, thereby enhancing the current-carrying performance of the current collector 30. Simultaneously, because the area of ​​the second connecting portion 32 can be made larger, the contact area between the current collector 30 and the core 300 increases. While maintaining the current-carrying performance of the current collector 30, the thickness of the second connecting portion 32 can be appropriately reduced. The thickness can be increased or decreased using the formula: P = J × S × t, where P is the current carrying capacity (A), J is the current density (A / mm²), S is the cross-sectional area (mm²), and t is the thickness (mm). With P and J constant, ensuring that the product of S and t in the circular current collector 322 remains constant guarantees the current carrying performance. Since the thickness of the second connecting portion 32 can be appropriately reduced, it is beneficial to further reduce the proportion of the current collector 30 and the top cover assembly 100 in the height direction of the battery 1000, thereby providing more space for designing the core 300, and increasing the capacity of the battery 1000 within the same external dimension range.

[0123] Please see Figure 11 In the top cover assembly 100 provided in the first embodiment of this application, the bending portion 33 includes a first bending line 333 and a second bending line 334, which are disposed on opposite sides of the bending portion 33 along the length direction of the current collector 30. The first bending line 333 is in contact with the pole post 20, and the second bending line 334 is in contact with the second connecting portion 32. The first bending line 333 and the second bending line 334 can be a groove structure.

[0124] The top cover assembly 100 provided in the first embodiment of this 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 contacts the pole post 20, and the second bending line 334 contacts the second connecting portion 32. This ensures that during the process of the second bending portion 33 of the current collector 30 relative to the first bending portion 33, the bending occurs only in the bending portion 33, without affecting the flatness of the first connecting portion and the second connecting portion 32, which is beneficial to further improving the bending accuracy of the current collector 30.

[0125] Please see Figures 1 to 11Based on the top cover assembly 100 provided in the first, second, and third embodiments of this application, the battery 1000 formed by encapsulating the top cover assembly 100 has several advantages. Firstly, since the current collector 30 is bent only once, its cumulative error is smaller, reducing the probability of the current collector 30 and the battery 1000 housing 200 coming into contact and thus failing to assemble. Secondly, the smaller cumulative error of the current collector 30 improves the concentricity of the top cover assembly 100 and the battery 1000 housing 200, resulting in a more uniform gap between them and improving the welding stability of the top cover assembly 100 and the battery 1000 housing 200. Meanwhile, since the current collector 30 is bent only once, its overall length is shorter and its resistance is lower, which helps improve the current carrying capacity of the current collector 30, thereby improving the current carrying capacity of the battery 1000's output power. In addition, since the current collector 30 is bent only once, the proportion of the cover plate 10 in the height direction of the battery 1000's casing 200 can be reduced, allowing the design dimensions of the battery 1000's core 300 in the height direction of the battery 1000 to be larger, which is beneficial for the miniaturization and high energy density design of the battery 1000. On the other hand, by having the first limiting part 40 on the second surface 10b of the cover plate 10 cooperate with the second limiting part 50 on the second connecting part 32, the amount of error caused by the bending of the second connecting part 32 relative to the first connecting part 31 is further limited. This helps to improve the bending accuracy of the second connecting part 32 relative to the first connecting part 31, and can further reduce the probability that the current collector 30 and the housing 200 of the battery 1000 will collide and fail to assemble the top cover assembly 100 and the battery 1000. This further improves the welding stability of the top cover assembly 100 and the housing 200 of the battery 1000. Meanwhile, the first limiting part 40 on the second surface 10b of the cover plate 10 cooperates with the second limiting part 50 on the second connecting part 32, which can also make the current collector 30 have the effects of anti-pull, anti-torsion, and anti-vibration misalignment during assembly or during subsequent use under conditions such as vibration. This can prevent the current collector 30 from tearing at the electrode tab welding point of the core 300 of the battery 1000 due to displacement or vibration, thereby improving the stability of the battery 1000.

[0126] Please see Figures 1 to 11Based on the battery 1000 formed by the top cover assembly 100 provided in the first, second, and third embodiments of this application, the energy storage device provided in this application includes the battery 1000. By including the battery 1000 in the energy storage device, on the one hand, the battery 1000 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 battery 1000 has high welding stability, which makes the energy storage device more stable.

[0127] The above are some embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications are also considered to be within the scope of protection of this application.

Claims

1. A top cover assembly for encapsulating a battery, characterized in that, include: The cover plate includes a first surface and a second surface disposed opposite to each other along a first direction; The pole post passes through the first surface and the second surface; as well as A flow collector is disposed on one side of the second surface of the cover plate; The current collector includes a first connecting part, a bent part, and a second connecting part connected in sequence. The first connecting part is electrically connected to the pole post, and the second connecting part is bent relative to the first connecting part. A first limiting part is provided on the second surface, and a second limiting part is provided on the second connecting part. The first limiting part and the second limiting part cooperate with each other. The first limiting part includes a first limiting post, and the second limiting part includes a first limiting hole; the first limiting post cooperates with the first limiting hole; The first limiting post includes a first limiting segment and a second limiting segment. One end of the second limiting segment is fixed to the second surface, and the other end of the second limiting segment is fixedly connected to the first limiting segment. The second limiting segment and the first limiting segment are coaxially arranged, and the radial dimension of the second limiting segment is greater than the radial dimension of the first limiting segment. The radial dimension of the first limiting hole is greater than or equal to the radial dimension of the first limiting segment, and the radial dimension of the first limiting hole is less than the radial dimension of the second limiting segment. The first limiting segment passes through the first limiting hole, and the second limiting segment abuts against the periphery of the first limiting hole.

2. The top cover assembly as claimed in claim 1, characterized in that, The first limiting part includes a second limiting post, and the first limiting post and the second limiting post are disposed on the second surface at a distance; The second limiting part includes a second limiting hole, and the first limiting hole and the second limiting hole are disposed at an interval in the second connecting part; The first limiting post mates with the first limiting hole, and the second limiting post mates with the second limiting hole.

3. The top cover assembly as described in claim 2, characterized in that, The second limiting post includes a third limiting segment and a fourth limiting segment. One end of the fourth limiting segment is fixed to the second surface, and the other end of the fourth limiting segment is fixedly connected to the third limiting segment. The fourth limiting segment and the third limiting segment are coaxially arranged, and the radial dimension of the fourth limiting segment is greater than the radial dimension of the third limiting segment. The radial dimension of the second limiting hole is greater than or equal to the radial dimension of the fourth limiting segment, and the radial dimension of the second limiting hole is less than the radial dimension of the fourth limiting segment.

4. The top cover assembly as claimed in claim 1, characterized in that, The second surface is provided with a positioning element, which is used to limit the first connecting portion.

5. The top cover assembly as claimed in claim 1, characterized in that, The top cover assembly also includes an explosion-proof valve. The cover plate has a pressure relief hole that penetrates the first surface and the second surface. The explosion-proof valve is located at the end of the pressure relief hole near the second surface and is spaced apart from the pole post.

6. The top cover assembly as claimed in claim 5, characterized in that, The top cover assembly also includes a protective film that covers the opening of the pressure relief hole near the first surface.

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

8. The top cover assembly as claimed in claim 7, characterized in that, The first limiting part is disposed on the side of the pole away from the explosion-proof valve, and the second limiting part is disposed on the side of the second connecting part away from the bending part.

9. The top cover assembly as claimed in claim 7, characterized in that, The current collector is integrally formed, the cover plate is circular, the second connecting part is fan-shaped, and the center of the circle containing the cover plate and the center of the circle containing the second connecting part are arranged opposite to each other along the first direction.

10. The top cover assembly as claimed in claim 7, characterized in that, The second connecting part includes a transition part and a collecting part. The first connecting part, the bending part, and the transition part are arranged in sequence as an integral structure. The collecting part is circular and is connected to the end of the transition part away from the bending part. The position where the transition part is connected to the collecting part is located on the side of the collecting part facing the cover plate.

11. The top cover assembly as claimed in claim 7, characterized in that, The second surface of the cover plate is provided with a stop member, which is located on the side of the pole near the explosion-proof valve and is used to abut against the battery core.

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

13. The top cover assembly as claimed in claim 12, characterized in that, The first limiting part is disposed on the side of the pole near the explosion-proof valve, and the second limiting part is disposed on the side of the second connecting part away from the bending part.

14. The top cover assembly as claimed in claim 12, characterized in that, The second connecting part is provided with a connecting hole, which penetrates the second connecting part along the first direction.

15. The top cover assembly as claimed in claim 12, characterized in that, The cover plate is circular, the second connecting part is circular, and the center of the circle containing the cover plate and the center of the circle containing the second connecting part are arranged opposite to each other along the first direction.

16. The top cover assembly as claimed in claim 12, characterized in that, The bending portion includes a first opening and a second opening, which are disposed on opposite sides of the bending portion along the width direction of the current collector.

17. The top cover assembly as claimed in claim 12, characterized in that, The bending portion includes a first bending line and a second bending line, and the first bending line and the second bending line are disposed on opposite sides of the bending portion along the length direction of the current collector; The first bend line contacts the pole post, and the second bend line contacts the second connecting part.

18. A battery, characterized in that, include: The shell has a receiving cavity; The core is housed within the receiving cavity; as well as The top cover assembly as described in any one of claims 1 to 17; The top cover assembly is used to encapsulate the housing; the pole, the current collector, and the winding core of the top cover assembly are electrically connected in sequence.

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

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