Top cover assembly and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a top cover assembly and a battery, the top cover assembly comprises a main top cover plate and an electrode terminal assembly installed on the main top cover plate, and the electrode terminal assembly comprises a sub top cover sheet installed on the main top cover plate and insulated from a tab; the pole column plate comprises a pole column plate body, the pole column plate body is arranged on the outer side of the sub-top cover plate, the pole column plate body and the sub-top cover plate are insulated and fixed, and through holes penetrating in the overlapping direction of the sub-top cover plate and the pole column plate are formed in the sub-top cover plate and the pole column plate; and the adapters are arranged in one-to-one correspondence with the via holes, each adapter comprises a connecting piece and an inserting part, the inserting parts extend into the via holes and are used for being connected with the tabs extending into the via holes, the connecting pieces are connected with the sides, far away from the tabs, of the inserting parts, and the connecting pieces are lapped on the sides, far away from the sub top cover pieces, of the pole plate body. The top cover assembly is applied to the battery, can effectively improve the space utilization rate of the battery cell in the shell, reduce the internal resistance of the battery cell, reduce heating, and can greatly reduce the risks of insertion and tearing of the tabs and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a top cover assembly and a battery. Background Art

[0002] With the development of new energy, the power battery industry has developed rapidly and its applications have become more and more extensive. As a result, the requirements for batteries have become higher and higher. In the current traditional structure of power batteries in the industry, connecting plates are used to connect the poles and the tabs. The connecting plates are set in the battery shell, which takes up space, affects the space utilization rate of the battery cells inside, and increases the internal resistance of the battery cells. In addition, the traditional structure of the tabs involves bending after welding, which also occupies the internal space of the battery, affects the space utilization rate of the battery cells, and there is also the risk of internal short circuit caused by the insertion of the tabs. Utility Model Content

[0003] The purpose of the utility model is to provide a top cover assembly and a battery. The top cover assembly, when applied to a battery, can effectively improve the space utilization rate of the battery cell in the shell, reduce the internal resistance of the battery cell, reduce heat generation, and the tabs do not need to be bent, which greatly reduces the risks of tab insertion and tearing.

[0004] In order to achieve the above object, the utility model provides the following technical solutions:

[0005] A top cover assembly, comprising: a main top cover plate and two electrode terminal assemblies mounted on the main top cover plate, wherein the two electrode terminal assemblies are respectively used to connect to the tabs of a battery cell, and the polarities of the tabs connected to the two electrode terminal assemblies are opposite; wherein each of the electrode terminal assemblies comprises:

[0006] A sub-top cover sheet, the sub-top cover sheet is mounted on the main top cover plate, and the sub-top cover sheet is insulated from the tab;

[0007] A pole plate, the pole plate comprising a pole plate body, the pole plate body being arranged on a side of the sub-top cover sheet away from the battery cell, the pole plate body being insulated from and fixedly connected to the sub-top cover sheet, and a via hole penetrating along a stacking direction of the sub-top cover sheet and the pole plate and used to be opposite to the pole ear;

[0008] Adapters are arranged one by one corresponding to the vias, and each of the adapters includes: a connecting piece and a plug-in portion, the plug-in portion extends into the via and is used to connect to the pole ear extending into the via, the connecting piece is connected to a side of the plug-in portion away from the pole ear, and the connecting piece is overlapped on a side of the pole plate body away from the sub-top cover plate, covering the corresponding via.

[0009] The top cover assembly is used to connect with the shell of the battery. When the top cover assembly is connected with the shell, the top cover assembly is arranged on the side of the shell with an opening, the main top cover plate is sealed and connected with the opening of the shell, and the main top cover plate is provided with a mounting hole for mounting the electrode terminal assembly, wherein the sub-top cover sheet and the pole plate in the electrode terminal assembly can be pre-assembled and fixed to form an integral component. When the top cover assembly is assembled and connected with the shell, the pole plate and the sub-top cover sheet can be assembled and fixed to form an integral component first, and then the sub-top cover sheet can be installed at the mounting hole of the main top cover plate for welding and fixing. The pole plate and the sub-top cover sheet are assembled in advance to form an integral component and directly installed and fixed with the mounting hole of the main top cover plate, which effectively improves the top cover assembly. Assembly efficiency, and the main top cover plate and the sub-top cover plate can all use common materials in the industry to reduce material costs; in addition, the adapter is welded to the pole ear, wherein the plug-in portion has a plug interface for inserting the pole ear, and the pole ear can be directly inserted and welded and fixed. At this time, the connecting piece of the adapter is in an upwardly folded state and can pass through the through holes on the sub-top cover plate and the pole plate. After the above preparations, the main top cover plate is aligned with the shell so that the through holes are aligned with the corresponding pole ears and connectors, so that the connectors and the pole ears extend into the through holes, and the connecting piece part of the connector passes through the through holes, the main top cover plate is fixed to the shell, the connecting piece is flattened, and placed on the pole plate body on the top side, and the connecting piece is welded and fixed to the pole plate body. As described above, the tabs of the battery cell extend vertically upward into the through holes of the top cover assembly and are connected to the upper pole plate, eliminating the need for connecting plates in the shell, reducing the space occupied in the shell, allowing the battery cell to have more space, and effectively improving the space utilization rate of the battery cell in the shell, which is beneficial to reducing the internal resistance of the battery cell and reducing heat generation. The tabs do not need to be bent, greatly reducing the risks of tab insertion and tearing.

[0010] Therefore, the above-mentioned top cover assembly, when applied to the battery, can effectively improve the space utilization rate of the battery cell in the shell, reduce the internal resistance of the battery cell, reduce heat generation, and the tabs do not need to be bent, which greatly reduces the risks of tab insertion and tearing.

[0011] Optionally, the top cover assembly also includes an upper plastic, which includes an upper plastic body located between the sub-top cover sheet and the pole plate body, the via hole includes a first opening located on the sub-top cover sheet, and a second opening located on the pole plate body, the first opening and the second opening are opposite to and connected to each other, and a first opening corresponding to the first opening is formed at a portion of the upper plastic body opposite to the first opening.

[0012] Optionally, the periphery of the first opening is connected with an insulating glue extending along the inner wall of the first opening into the second opening, and the insulating glue covers the inner wall of the first opening;

[0013] The edge of the insulating glue away from the upper plastic body is connected with an extension portion extending toward the outside of the second opening, and the extension portion is attached to a side of the sub-top cover sheet facing the battery core; the extension portion, the insulating glue and the upper plastic body have an integrated structure.

[0014] Optionally, a protruding buckle is provided on one side of the upper plastic body facing the pole plate body, a through hole cooperating with the protruding buckle is provided on the pole plate body, and the protruding buckle passes through the through hole to be engaged with the through hole.

[0015] Optionally, the pole plate body is provided with a welding protrusion protruding toward a side away from the sub-top cover plate, and a protruding top surface of the welding protrusion forms a welding surface for connecting to an external connecting piece.

[0016] Optionally, a local portion of the pole plate body is bent to form an arched structure protruding away from the sub-top cover sheet, and the arched structure constitutes the welding protrusion.

[0017] Optionally, the main top cover plate is provided with mounting holes corresponding to the sub-top cover plates one by one, the mounting holes are stepped holes, the mounting holes include a first hole and a second hole, the first hole is located on a side of the second hole away from the battery core, the diameter of the first hole is larger than the diameter of the second hole, and a side wall of the second hole forms a first step surface toward one end of the first hole;

[0018] The outer peripheral side of the sub-top cover sheet is formed with a stepped structure that matches the stepped hole, and the stepped structure is matched and connected with the stepped hole so that the sub-top cover sheet is embedded in the main top cover plate;

[0019] The surface of the sub-top cover sheet away from the battery cell is flush with the surface of the main top cover plate away from the battery cell, and the surface of the sub-top cover sheet facing the battery cell is flush with the surface of the main top cover plate facing the battery cell.

[0020] Optionally, a lower plastic is provided on a side of the main top cover plate facing the battery core, and second openings corresponding to the via holes are provided on the lower plastic.

[0021] Optionally, at least two via holes are provided on each of the sub-top cover sheets and the pole plate body, and the at least two via holes are arranged at intervals, and each of the electrode terminal assemblies is used to connect to at least two pole tabs with the same polarity.

[0022] The utility model also provides a battery, comprising a shell, any one of the top cover components provided by the above technical solution, and a battery cell arranged in the shell, wherein the top cover component is arranged on one side of the shell and is fixedly connected to the shell, and the adapter of the top cover component is connected to the pole ear of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. Among them:

[0024] Figure 1 A schematic diagram of the structure of a battery provided by an embodiment of the utility model;

[0025] Figure 2 A schematic cross-sectional view of a top cover assembly of a battery provided by an embodiment of the utility model;

[0026] Figure 3 for Figure 2 The enlarged schematic diagram of point A in the middle;

[0027] Figure 4 A schematic diagram of the assembly of some components of an electrode terminal provided in an embodiment of the utility model.

[0028] Icons: 1-top cover assembly; 2-shell; 3-battery cell; 11-main top cover plate; 12-electrode terminal assembly; 13-explosion-proof valve assembly; 31-ear; 111-mounting hole; 121-sub-top cover plate; 122-pole plate; 123-via; 124-connector; 125-upper plastic; 126-lower plastic; 1221-pole plate body; 1222-welding protrusion; 1241-plug-in part; 1242-connecting piece; 1251-upper plastic body; 1252-insulating glue; 1253-extension part; 1254-protruding buckle. DETAILED DESCRIPTION

[0029] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present invention and does not limit the present invention. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as a part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desired that the present invention includes such modifications and variations within the scope of the appended claims and their equivalents.

[0030] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. The terms "connected", "connected" and "set" used in the present invention should be understood in a broad sense. For example, they can be fixedly connected or detachably connected; they can be directly connected or indirectly connected through an intermediate component. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0031] refer to Figure 1 and Figure 2 As shown, the utility model provides a top cover assembly, the top cover assembly 1 comprises: a main top cover plate 11 and two electrode terminal assemblies 12 installed on the main top cover plate 11, the two electrode terminal assemblies 12 are respectively used to connect with the pole ears 31 of the battery cell 3, the polarities of the pole ears 31 connected to the two electrode terminal assemblies 12 are opposite, specifically, the pole ears 31 of the two polarities of the battery cell 3 are respectively a positive pole ear 31 and a negative pole ear 31, and one of the two electrode terminal assemblies 12 is used to connect with the positive pole ear 31 is connected, and the other is used to connect with the negative pole ear 31; wherein the two electrode terminal assemblies 12 have the same structure, and each electrode terminal assembly 12 comprises: a sub-top cover sheet 121, a pole plate 122 and an adapter, the sub-top cover sheet 121 is installed on the main top cover plate 11, and the sub-top cover sheet 121 is insulated from the corresponding pole ear 31; the pole plate 122 comprises a pole plate body 1221, and the pole plate body 1221 is arranged on the side of the sub-top cover sheet 121 away from the battery cell 3, and the pole plate body 1221 21 is insulated from and fixedly connected to the sub-top cover sheet 121, and the side of the pole plate body 1221 away from the sub-top cover sheet 121 has a welding area for welding with an external connector 124, such as a welding busbar, and the sub-top cover sheet 121 and the pole plate 122 are formed with a through hole 123 that penetrates along the stacking direction of the two and is used to face the pole ear 31; the adapter is arranged in a one-to-one correspondence with the through hole 123, and each adapter includes: a connecting piece 1242 and a plug-in portion 1241, and the plug-in portion 1241 extends into the through hole 123 and is used to connect with the pole ear 31 extending into the through hole 123, the connecting piece 1242 is connected to the side of the plug-in portion 1241 away from the pole ear 31, and the connecting piece 1242 is overlapped on the side of the pole plate body 1221 away from the sub-top cover sheet 121, covering the corresponding through hole 123, the connecting piece 1242 can completely cover the opening of the through hole 123 on the top side of the pole plate body 1221, and is welded and sealed to the pole plate body 1221.

[0032] like Figure 1 and Figure 2As shown, the top cover assembly 1 is used to connect with the battery housing 2. When the top cover assembly 1 is connected with the housing 2, the top cover assembly 1 is arranged on the side of the housing 2 having an opening, the main top cover plate 11 is sealed and connected with the opening of the housing 2, and the main top cover plate 11 is provided with a mounting hole 111 for mounting the electrode terminal assembly 12, wherein, as Figure 2 and Figure 4 As shown, Figure 4 : is an assembly schematic diagram of the sub-top cover sheet and the pole plate. The sub-top cover sheet 121 and the pole plate 122 in the electrode terminal assembly 12 can be pre-assembled and fixed to form an integral component. When the top cover assembly 1 is assembled and connected to the shell 2, the pole plate 122 and the sub-top cover sheet 121 can be assembled and fixed to form an integral component first, and then the sub-top cover sheet 121 can be installed at the mounting hole 111 of the main top cover plate 11 for welding and fixing. The pole plate 122 and the sub-top cover sheet 121 are assembled into an integral component in advance and directly installed and fixed with the mounting hole 111 of the main top cover plate 11, which effectively improves the assembly efficiency of the top cover assembly 1, and the main top cover plate 11 and the sub-top cover sheet 121 can both use common materials in the industry to reduce material costs; in addition, the adapter and the pole ear 31 are connected. Welding, wherein the plug-in portion 1241 has an insertion port for inserting the pole ear 31, and the pole ear 31 can be directly inserted and welded and fixed. At this time, the connecting piece 1242 of the adapter is in an upwardly folded state and can pass through the through hole 123 on the sub-top cover plate 121 and the pole plate 122. After the above preparations, the main top cover plate 11 is aligned with the shell 2 so that the through hole 123 is aligned with the corresponding pole ear 31 and the connecting member 124, so that the connecting member 124 and the pole ear 31 extend into the through hole 123, and the connecting piece 1242 in the connecting member 124 partially passes through the through hole 123, and the main top cover plate 11 is fixed to the shell 2, and the connecting piece 1242 is flattened and placed on the pole plate body 1221 on the top side, and the connecting piece 1242 is welded and fixed to the pole plate body 1221. As described above, the pole ear 31 of the battery cell 3 extends vertically upward into the through hole 123 of the top cover assembly 1 and is connected to the pole plate 122 above, eliminating the need for a connecting piece 1242 in the shell 2, reducing the space occupied in the shell 2, allowing the battery cell 3 to have more installation space, and effectively improving the space utilization rate of the battery cell 3 in the shell 2, which is beneficial to reducing the internal resistance of the battery cell 3 and reducing heat generation, and the pole ear 31 does not need to be bent, greatly reducing the risks of insertion and tearing of the pole ear 31.

[0033] Therefore, the above-mentioned top cover assembly, when applied to the battery, can effectively improve the space utilization rate of the battery cell in the shell, reduce the internal resistance of the battery cell, reduce heat generation, and the tabs do not need to be bent, which greatly reduces the risks of tab insertion and tearing.

[0034] In a possible implementation, Figure 2As shown, the top cover assembly 1 further includes an upper plastic 125, which includes an upper plastic body 1251 located between the sub-top cover sheet 121 and the pole plate body 1221. The upper plastic 125 is made of insulating material to insulate and separate the pole plate body 1221 from the sub-top cover sheet 121. The via 123 includes a first opening located on the sub-top cover sheet 121 and a second opening located on the pole plate body 1221. The first opening and the second opening are opposite to and connected to each other. A first opening corresponding to the first opening is formed at a portion of the upper plastic body 1251 opposite to the first opening, so that the via 123 is in a through state, so that the first opening and the second opening are through-connected from top to bottom.

[0035] Furthermore, if Figure 3 As shown, in order to ensure better insulation between the sub-top cover sheet and the pole ear, an insulating glue 1252 extending along the inner wall of the first opening into the second opening is connected to the periphery of the first opening, and the insulating glue 1252 covers the inner wall of the first opening; and the edge of the insulating glue 1252 away from the upper plastic body 1251 is connected to an extension portion 1253 extending toward the outside of the second opening, and the extension portion 1253 is attached to the side of the sub-top cover sheet 121 facing the battery cell 3; the insulating glue 1252 extends from the edge of the first opening to cover the inner wall of the first opening, and then bends and extends toward the inner side surface of the sub-top cover sheet 121, and is attached to the inner side surface of the sub-top cover sheet 121, covering it tightly to prevent the pole ear 31 and the adapter sheet extending into the first opening from contacting the inner wall of the first opening, thereby ensuring the insulation between the pole ear 31 and the sub-top cover sheet 121, and can be stably fixed to the sub-top cover sheet 121. The extension portion 1253 , the insulating adhesive 1252 and the upper plastic body 1251 may be an integrated structure.

[0036] Specifically, Figure 2 and Figure 3 As shown, the upper plastic body 1251 can be adhesively fixed on the sub-top cover sheet 121, or can be injection molded on the sub-top cover sheet 121. The upper plastic body 1251 and the sub-top cover sheet 121 are fixedly connected. For the connection and fixation between the upper plastic body 1251 and the pole plate body 1221, a protruding buckle 1254 can be provided on the side of the upper plastic body 1251 facing the pole plate body 1221, and a through hole matching the protruding buckle 1254 is provided on the pole plate body 1221. The protruding buckle 1254 passes through the through hole and is engaged with the through hole, which can play a role of limiting and fixing, and the connection is convenient and reliable, and the disassembly is convenient, which is conducive to improving the assembly efficiency.

[0037] In one possible implementation, Figure 1 and 2As shown, the pole plate body 1221 is provided with a welding protrusion 1222 protruding toward the side away from the sub-top cover sheet 121, and the welding protrusion 1222 is located in the welding area of ​​the pole plate body 1221. The protruding top surface of the welding protrusion 1222 forms a welding surface for connecting to the external connecting piece 124, and the welding surface can be welded to the bus to ensure the electrical connection performance of the battery cell 3.

[0038] Exemplarily, a local portion of the pole plate body 1221 is bent to form an arched structure protruding away from the sub-top cover sheet 121, and the arched structure constitutes a welding protrusion 1222. The welding protrusion 1222 is formed by directly bending and arching a portion of the pole plate body 1221, ensuring that the overall plate thickness of the pole plate body 1221 is uniform without abnormal thickness locally, which is conducive to reducing internal resistance.

[0039] Specifically, as a method of installing and fixing the sub-top cover sheet and the main top cover plate, such as Figure 1 and Figure 2 As shown, a mounting hole 111 corresponding to the sub-top cover piece 121 is provided on the main top cover plate 11, the mounting hole 111 is a through hole, the mounting hole 111 is a stepped hole, the mounting hole 111 includes a first hole and a second hole, the first hole is located on the side of the second hole away from the battery cell 3, the diameter of the first hole is greater than the diameter of the second hole, and the side wall of the second hole forms a first step surface toward one end of the first hole; correspondingly, a stepped structure matching the stepped hole is formed on the outer peripheral side of the sub-top cover piece 121, and the stepped structure is connected with the stepped hole so that the sub-top cover piece 121 is embedded in the main top cover plate 11; wherein, the surface of the sub-top cover piece 121 away from the battery cell 3 is flush with the surface of the main top cover plate 11 away from the battery cell 3, and the surface of the sub-top cover piece 121 facing the battery cell 3 is flush with the surface of the main top cover plate 11 facing the battery cell 3, so that the space in the battery casing 2 is reasonably occupied and no unnecessary occupied space is generated.

[0040] In a possible implementation, Figure 2 As shown, a lower plastic 126 is provided on the side of the main top cover plate 11 facing the battery cell 3. The lower plastic 126 is made of insulating material. A second opening corresponding to the via hole 123 is provided on the lower plastic 126 so that the tab 31 can pass through. The lower plastic 126 effectively insulates the main top cover plate 11 from the battery cell 3.

[0041] Based on the above top cover assembly, refer to Figure 2 As shown, in order to adapt to the number of internal battery cells 3 or the number of pole tabs 31 with the same polarity, at least two vias 123 can be provided on each sub-top cover sheet 121 and the pole plate body 1221. The at least two vias 123 are arranged at intervals, and each electrode terminal assembly 12 is used to connect to at least two pole tabs 31 with the same polarity.

[0042] Exemplary, reference Figure 1 and Figure 2 As shown, two battery cells 3 are arranged in the housing 2, each battery cell 3 has a positive electrode ear 31 and a negative electrode ear 31, and the electrodes 31 of the same polarity are arranged on the same side, then two vias 123 can be arranged on each electrode terminal assembly, so that the two electrodes 31 are connected to the same electrode terminal assembly 12. Among them, the welding protrusion 1222 can be arranged between the two vias 123, and the protrusion buckles 1254 are arranged on both sides of the welding protrusion 1222.

[0043] Specifically, Figure 1 As shown, the top cover assembly 1 also includes an explosion-proof valve assembly 13 installed on the main top cover plate 11, which plays an explosion-proof role and ensures the safety of battery use.

[0044] Based on the same design concept, Figure 1 and Figure 2 As shown, this embodiment also provides a battery, which can be a power battery, wherein the battery specifically includes a housing 2, any one of the top cover components 1 provided in the above embodiments, and a battery cell 3 disposed in the housing 2, wherein the top cover component 1 is disposed on one side of the housing 2 and is fixedly connected to the housing 2, and the adapter of the top cover component 1 is connected to the tab 31 of the battery cell 3. The battery can effectively improve the space utilization rate of the battery cell 3 in the housing 2, reduce the internal resistance of the battery cell 3, reduce heat generation, and the tab 31 does not need to be bent, which greatly reduces the risk of insertion and tearing of the tab 31.

[0045] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A top cover assembly, characterized in that: include: A main top cover plate and two electrode terminal assemblies mounted on the main top cover plate, wherein the two electrode terminal assemblies are respectively used to connect to the tabs of the battery cell, and the tabs connected to the two electrode terminal assemblies have opposite polarities; wherein each of the electrode terminal assemblies comprises: A sub-top cover sheet, the sub-top cover sheet is mounted on the main top cover plate, and the sub-top cover sheet is insulated from the tab; A pole plate, the pole plate comprising a pole plate body, the pole plate body being arranged on a side of the sub-top cover sheet away from the battery cell, the pole plate body being insulated from and fixedly connected to the sub-top cover sheet, and a via hole penetrating along a stacking direction of the sub-top cover sheet and the pole plate and used to be opposite to the pole ear; Adapters are arranged one by one corresponding to the vias, and each of the adapters includes: a connecting piece and a plug-in portion, the plug-in portion extends into the via and is used to connect to the pole ear extending into the via, the connecting piece is connected to a side of the plug-in portion away from the pole ear, and the connecting piece is overlapped on a side of the pole plate body away from the sub-top cover plate, covering the corresponding via.

2. The top cover assembly according to claim 1, characterized in that: It also includes an upper plastic, which includes an upper plastic body located between the sub-top cover sheet and the pole plate body, the via hole includes a first opening located on the sub-top cover sheet, and a second opening located on the pole plate body, the first opening and the second opening are opposite to and connected to each other; a first opening corresponding to the first opening is formed at a portion of the upper plastic body opposite to the first opening.

3. The top cover assembly according to claim 2, characterized in that: The periphery of the first opening is connected with an insulating glue extending along the inner wall of the first opening into the second opening, and the insulating glue covers the inner wall of the first opening; The edge of the insulating glue away from the upper plastic body is connected with an extension portion extending toward the outside of the second opening, and the extension portion is attached to a side of the sub-top cover sheet facing the battery core; the extension portion, the insulating glue and the upper plastic body have an integrated structure.

4. The top cover assembly according to claim 2, characterized in that: A protruding buckle is arranged on one side of the upper plastic body facing the pole plate body, a through hole matched with the protruding buckle is arranged on the pole plate body, and the protruding buckle passes through the through hole and is engaged with the through hole.

5. The top cover assembly according to claim 1, characterized in that: The pole plate body is provided with a welding protrusion protruding toward a side away from the sub-top cover plate, and the protruding top surface of the welding protrusion forms a welding surface for connecting with an external connecting piece.

6. The top cover assembly according to claim 5, characterized in that: A local portion of the pole plate body is bent to form an arched structure protruding away from the sub-top cover sheet, and the arched structure constitutes the welding protrusion.

7. The top cover assembly according to claim 1, characterized in that: The main top cover plate is provided with mounting holes corresponding to the sub-top cover plates one by one, the mounting holes are stepped holes, and the mounting holes include a first hole and a second hole, the first hole is located on a side of the second hole away from the battery core, the diameter of the first hole is larger than the diameter of the second hole, and a side wall of the second hole forms a first step surface toward one end of the first hole; The outer peripheral side of the sub-top cover sheet is formed with a stepped structure that matches the stepped hole, and the stepped structure is matched and connected with the stepped hole so that the sub-top cover sheet is embedded in the main top cover plate; The surface of the sub-top cover sheet away from the battery cell is flush with the surface of the main top cover plate away from the battery cell, and the surface of the sub-top cover sheet facing the battery cell is flush with the surface of the main top cover plate facing the battery cell.

8. The top cover assembly according to claim 1, characterized in that: A lower plastic is arranged on one side of the main top cover plate facing the battery core, and second openings corresponding to the via holes are arranged on the lower plastic.

9. The top cover assembly according to any one of claims 1 to 8, characterized in that: At least two via holes are provided on each of the sub-top cover sheets and the pole plate body, and the at least two via holes are arranged at intervals. Each of the electrode terminal assemblies is used to connect to at least two pole tabs with the same polarity.

10. A battery, characterized in that: It comprises a shell, a top cover assembly as described in any one of claims 1 to 9, and a battery cell arranged in the shell, wherein the top cover assembly is arranged on one side of the shell and is fixedly connected to the shell, and the adapter of the top cover assembly is connected to the pole ear of the battery cell.

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