Battery top cover structure and battery

Abstract

The embodiment of the utility model provides a kind of battery top cover structure and battery, it is related to battery technical field.The utility model provides a kind of battery top cover structure, including cover body subassembly and connecting piece, pole is equipped on cover body subassembly, pole is equipped with center through-hole, center through-hole is penetrated from the top of pole to bottom;Connecting piece is equipped with first connecting surface and second connecting surface for connecting tab, first connecting surface and second connecting surface are located at the opposite sides of connecting piece, connecting piece and tab are set in center through-hole.This application is compared with traditional current collection structure design, by setting pole and connecting piece, make pole with hollow through hole accommodate part connecting piece and tab, make the space and height of cover body subassembly accommodate connecting piece and tab reduce, improve the space utilization of roll core inside battery shell to some extent, and the capacity and energy density of corresponding battery cell will also be improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a battery top cover structure and a battery. Background Technology

[0002] In the overall structure of the battery cell, the internal space of the casing houses the core, connectors, insulators, and all or part of the cover assembly. The cover assembly, in turn, houses the connectors and the electrode tabs of the core. The assembly process is as follows: After the core is connected to the adapter plate and electrode terminals, it is folded towards the center of the casing to ensure smooth insulation and placement.

[0003] In the case of power cells, the core is folded towards the center to ensure insulation and placement in the casing. This results in the core's tabs being folded into a double-layer structure, which requires a larger overall height for the cover assembly that houses the core's tabs. Consequently, the internal space occupied by the core is reduced, which to some extent lowers the cell's capacity and energy density. Utility Model Content

[0004] The purpose of this utility model is to provide a battery top cover structure and a battery that can improve the space utilization rate of the core inside the battery cell.

[0005] The embodiments of this utility model can be implemented as follows:

[0006] In a first aspect, this utility model provides a battery top cover structure, comprising:

[0007] A cover assembly, wherein the cover assembly is provided with an electrode post, the electrode post is provided with a central through hole, the central through hole extending from the top to the bottom of the electrode post;

[0008] A connector is provided with a first connecting surface and a second connecting surface for connecting a tab. The first connecting surface and the second connecting surface are located on opposite sides of the connector, and the connector and the tab are disposed in the central through hole.

[0009] In an optional embodiment, the central through hole includes a first through hole and a second through hole that are connected. The first through hole is disposed near the top of the pole post, and the second through hole is disposed near the bottom of the pole post. The width of the first through hole is smaller than the width of the second through hole.

[0010] The connector extends through the first through hole and the second through hole so that the electrode tab is accommodated in the second through hole; and the first through hole is sealed to the connector.

[0011] In an optional embodiment, the connector includes a first connecting portion and a second connecting portion, wherein the first connecting surface and the second connecting surface are located on opposite sides of the second connecting portion;

[0012] The first connecting part is disposed in the first through hole, and the first connecting part is sealed to the first through hole;

[0013] The second connecting part and the electrode tab are disposed in the second through hole.

[0014] In an optional embodiment, the connector includes a support foot disposed at the bottom of the connector, the support foot being used to support the connector on the winding core.

[0015] In an optional embodiment, the support foot includes a connecting part and a supporting part. The bottom of the connector on both sides is provided with a connecting part, and the supporting part is vertically arranged at the bottom of the connecting part.

[0016] In an optional embodiment, the connector and the electrode tab are sealed together within the second through hole using sealant.

[0017] In an optional embodiment, the electrode tab is welded to the first connecting surface and the second connecting surface.

[0018] In an optional embodiment, the pole post includes a column and a base plate. The column is provided with a mating through hole, and the base plate is provided with a central through hole. One end of the base plate is mated in the mating through hole, and the other end of the base plate is located at the bottom of the column and connected to the lower plastic limiter at the bottom of the cover assembly.

[0019] In an optional embodiment, the end of the pole is welded to the end of the connector to form a weld, the width of which is ≥0.9mm;

[0020] The pole and the connector satisfy the following relationship:

[0021] 0.9mm ≤ the end width of the connector ≤ the end face width of the pole post - 0.6mm;

[0022] The end width of the connector is less than or equal to the end length of the connector and the end face length of the pole post minus 0.6 mm.

[0023] Secondly, this utility model provides a battery, including the battery top cover structure described in any of the foregoing embodiments.

[0024] The beneficial effects of the battery top cover structure and battery provided in this embodiment of the utility model include:

[0025] Compared to traditional current collector structure designs, this application incorporates a terminal post and connectors. The terminal post with a hollow through-hole accommodates part of the connectors and tabs, reducing the space and height of the cover assembly for the connectors and tabs. This improves the space utilization of the core inside the battery casing to some extent, and consequently increases the capacity and energy density of the battery cell. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the battery structure provided in this embodiment;

[0028] Figure 2 This is a cross-sectional view of the battery top cover structure provided in this embodiment without any connecting parts;

[0029] Figure 3 This is a first cross-sectional view of the battery top cover structure provided in this embodiment;

[0030] Figure 4 This is a second cross-sectional view of the battery top cover structure provided in this embodiment;

[0031] Figure 5 This is a structural diagram showing the connection between the core and the connector provided in this embodiment;

[0032] Figure 6 This is a partial structural diagram of the connection between the core and the connector provided in this embodiment;

[0033] Figure 7 This is a structural diagram of the connector provided in this embodiment.

[0034] Icons: 010 - Battery; 100 - Battery top cover structure; 110 - Cover assembly; 111 - Cover; 112 - Lower plastic; 113 - Upper plastic; 120 - Terminal post; 121 - Center through hole; 1211 - First through hole; 1212 - Second through hole; 122 - Post; 123 - Base plate; 124 - Sealing ring; 125 - Positive terminal post; 126 - Negative terminal post; 130 - Connector; 131 - First connecting surface; 132 - Second connecting surface; 133 - First connecting part; 134 - Second connecting part; 135 - Support foot; 1351 - Connecting part; 1352 - Support part; 200 - Core; 210 - Tab; 211 - Positive tab; 212 - Negative tab; 300 - Housing. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0038] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0039] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0040] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0041] The following describes in detail the overall structure, working principle, and technical effects of the battery top cover structure 100 and battery 010 provided by this utility model through embodiments and in conjunction with the accompanying drawings.

[0042] Please refer to Figures 1-2 The battery top cover structure 100 provided by this utility model is applied to a lithium-ion battery 010.

[0043] Please refer to Figure 1 The present invention proposes a battery 010, which includes a battery top cover structure 100.

[0044] In this embodiment, the battery 010 includes a winding core 200.

[0045] The core 200 is formed by stacking and winding a positive electrode sheet, a negative electrode sheet, and a separator around a central axis, and has a tab 210 extending from its top corresponding to the electrode sheet; the tab 210 is used for electrical connection with the connector 130.

[0046] Please refer to Figure 5 The tab 210 includes a positive tab 211 and a negative tab 212, which are disposed on the core 200.

[0047] In this embodiment, the battery 010 includes a housing 300.

[0048] Please refer to Figure 1 The housing 300 has a groove structure with an opening on one side. The core 200 is housed inside the housing 300. The core 200 is provided with tabs 210 facing the opening end of the housing 300. The cover assembly 110 is provided at the opening end of the housing 300 and connected to the housing 300.

[0049] In this embodiment, the battery 010 includes a battery top cover structure 100.

[0050] Please refer to Figure 2 The battery top cover structure 100 proposed in this embodiment includes:

[0051] The cover assembly 110 has a pole post 120 on it, and a central through hole 121 on the pole post 120, which extends from the top to the bottom of the pole post 120.

[0052] The connector 130 has a first connecting surface 131 and a second connecting surface 132 for connecting the tab 210. The first connecting surface 131 and the second connecting surface 132 are located on opposite sides of the connector 130. The connector 130 and the tab 210 are disposed in the central through hole 121.

[0053] It is understandable that after connecting the tab 210 to the first connecting surface 131 and the second connecting surface 132 of the connector 130, the connector 130 and the tab 210 are placed in the central through hole 121, and the connector 130 is welded to the terminal post 120. Compared with the traditional current collector structure design, the battery top cover structure 100 proposed in this application is a vertical structure design. By setting the terminal post 120 and the connector 130, the terminal post 120 with the hollow through hole can accommodate part of the connector 130 and the tab 210, reducing the height of the lower plastic 112 of the cover assembly 110. This improves the space utilization rate of the core 200 inside the battery 010 casing 300 to a certain extent, and the corresponding cell capacity and energy density will also be improved.

[0054] In this embodiment, the battery top cover structure 100 includes a cover assembly 110.

[0055] In this embodiment, please refer to Figures 1-2 The cover assembly 110 includes two pole posts 120, a cover body 111, and a lower plastic 112 located at the bottom of the cover body 111. The lower plastic 112 is used to insulate the core 200 from the housing 300 and also to accommodate part of the connector 130 and the tab 210. The cover body 111 and the lower plastic 112 have two slots relative to the positions of the positive tab 211 and negative tab 212 of the core 200. These slots are used to seal the two pole posts 120. One pole post 120 is a positive pole post 125, which is connected to the positive tab 211 via the connector 130. The other pole post 120 is a negative pole post 126, which is connected to the negative tab 212 via the connector 130.

[0056] Please refer to Figures 3-4 The cover assembly 110 also includes two upper plastics 113, which are disposed on the top of the cover 111 and are respectively positioned within the slots of the two pole posts 120.

[0057] In this embodiment, please refer to Figures 2-4 The pole post 120 includes a column body 122 and a base plate 123. The column body 122 is provided with a mating through hole, and the base plate 123 is provided with a central through hole 121. One end of the base plate 123 is mated in the mating through hole, and the other end of the base plate 123 is located at the bottom of the column body 122 and is limited and connected to the lower plastic 112 at the bottom of the cover assembly 110.

[0058] The column 122 is sealed and fitted between the upper plastic 113, the lower plastic 112 and the other end of the base plate 123 by a sealing ring 124.

[0059] In this embodiment, please refer to Figure 2 The central through hole 121 includes a first through hole 1211 and a second through hole 1212 that are connected. The first through hole 1211 is located near the top of the pole post 120, and the second through hole 1212 is located near the bottom of the pole post 120. The width of the first through hole 1211 is smaller than the width of the second through hole 1212. The connector 130 is disposed in the first through hole 1211 and the second through hole 1212 so that the electrode tab 210 is accommodated in the second through hole 1212. The first through hole 1211 is sealed to the connector 130.

[0060] In this embodiment, the battery top cover structure 100 includes a connector 130.

[0061] Please refer to Figures 3-4The connector 130 is provided with a first connecting surface 131 and a second connecting surface 132 for connecting the tab 210. The first connecting surface 131 and the second connecting surface 132 are located on opposite sides of the connector 130. The connector 130 and the tab 210 are disposed in the central through hole 121.

[0062] In this embodiment, please refer to Figure 7 The connector 130 includes a first connecting portion 133 and a second connecting portion 134, with a first connecting surface 131 and a second connecting surface 132 located on opposite sides of the second connecting portion 134; please refer to Figure 3 The first connecting part 133 is disposed within the first through hole 1211, and the first connecting part 133 is sealed to the first through hole 1211; please refer to Figure 3 The second connecting part 134 and the tab 210 are disposed in the second through hole 1212.

[0063] Please refer to Figure 6 and Figure 7 The second connecting part 134 has a first connecting surface 131 and a second connecting surface 132 on two opposite sides. The first connecting surface 131 and the second connecting surface 132 are used to weld the electrode tab 210 and serve as a medium for electrical connection between the core 200 and the pole post 120.

[0064] The end of the first connecting part 133 is welded and sealed to the opening side of the first through hole 1211 of the center through hole 121 of the pole post 120.

[0065] In this embodiment, the end of the pole post 120 is welded to the end of the first connecting portion 133 of the connector 130 to form a weld, and the width of the weld is ≥0.9mm.

[0066] To avoid the heat-affected zone of the weld, the pole post 120 and the connector 130 satisfy the following relationship:

[0067] The end width of the first connecting part 133 of the connector 130 is ≤ 0.9mm ≤ the end face width of the pole post 120 - 0.6mm;

[0068] The end width of the first connecting part 133 of the connector 130 is less than or equal to the end length of the first connecting part 133 of the connector 130 and less than or equal to the end face length of the pole post 120 - 0.6 mm.

[0069] In this embodiment, please refer to Figure 6 and Figure 7The connector 130 also includes a support foot 135, which is disposed at the bottom of the connector 130 and is used to support the connector 130 on the bare battery cell. The first connecting portion 133 and the support portion 1352 are disposed at opposite ends of the second connecting portion 134, with the first connecting portion 133 located at the top of the second connecting portion 134 and the support foot 135 located at the bottom of the second connecting portion 134.

[0070] In this embodiment, please refer to Figure 7 The support foot 135 includes a connecting part 1351 and a support part 1352. The bottom of the connector 130 on both sides is provided with a connecting part 1351, and the support part 1352 is vertically arranged at the bottom of the connecting part 1351.

[0071] The support foot 135 is used to support the first connecting part 133, the second connecting part 134 and the electrode 210, so as to facilitate the assembly of the connector 130 and the electrode 210 with the central through hole 121.

[0072] The support portion 1352 of the support foot 135 is higher than the first connecting surface 131 and the second connecting surface 132, so that the electrode tab 210 can be easily welded to the first connecting surface 131 and the second connecting surface 132.

[0073] It is understandable that the connector 130 is designed as an integral inverted "T" shaped structure. After the first connecting surface 131 and the second connecting surface 132 of the connector 130 are welded with the tab 210, part of the connector 130 and the tab 210 are placed together in the central through hole 121, which reduces the space in the cover assembly 110 that accommodates the tab 210 and lowers the height of the tab 210.

[0074] It is worth mentioning that in this embodiment, the connector 130 and the tab 210 are sealed in the second through hole 1212 of the central through hole 121 by sealant.

[0075] It is understandable that after welding the tab 210 to the connector 130, sealant is applied to the root position where the connector 130 and the tab 210 are connected, or sealant is applied around the second through hole 1212. Before the sealant solidifies, the connector 130 is inserted into the central through hole 121. After the sealant solidifies, it forms a sealant layer, which can prevent the electrolyte from corroding the weld.

[0076] Alternatively, the sealant can be a UV adhesive, etc.

[0077] The working principle and process of the battery top cover structure 100 provided in this embodiment of the utility model are as follows: The connector 130 is supported on the core 200, and the tabs 210 of the core 200 are welded to the first connecting surface 131 and the second connecting surface 132 of the connector 130; further, the first connecting part 133 and the second connecting part 134 of the adapter are fitted into the central through hole 121, and the first connecting part 133 of the adapter is welded to the first through hole 1211 of the pole post 120. In this way, the core 200 and the cover assembly 110 are electrically connected through the connector 130. Finally, the cover assembly 110 and the core 200 are inserted into the shell, and the cover assembly 110 is welded to the shell 300 to form the battery 010.

[0078] In summary, the battery top cover structure 100 and battery 010 provided in this utility model embodiment, compared with the traditional current collector structure design, by setting the terminal post 120 and the connector 130, the terminal post 120 with the hollow through hole can accommodate part of the connector 130 and the tab 210, thereby reducing the space and height of the cover assembly 110 to accommodate the connector 130 and the tab 210, which to a certain extent improves the space utilization rate of the core 200 inside the battery 010 casing 300, and the corresponding capacity and energy density of the battery cell will also be improved.

[0079] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A battery top cover structure, characterized in that, include: A cover assembly, wherein the cover assembly is provided with an electrode post, the electrode post is provided with a central through hole, the central through hole extending from the top to the bottom of the electrode post; A connector is provided with a first connecting surface and a second connecting surface for connecting a tab. The first connecting surface and the second connecting surface are located on opposite sides of the connector, and the connector and the tab are disposed in the central through hole.

2. The battery top cover structure according to claim 1, characterized in that, The central through hole includes a first through hole and a second through hole that are connected. The first through hole is located near the top of the pole post, and the second through hole is located near the bottom of the pole post. The width of the first through hole is smaller than the width of the second through hole. The connector extends through the first through hole and the second through hole so that the electrode tab is accommodated in the second through hole; and the first through hole is sealed to the connector.

3. The battery top cover structure according to claim 2, characterized in that, The connector includes a first connecting portion and a second connecting portion, wherein the first connecting surface and the second connecting surface are located on opposite sides of the second connecting portion; The first connecting part is disposed in the first through hole, and the first connecting part is sealed to the first through hole; The second connecting part and the electrode tab are disposed in the second through hole.

4. The battery top cover structure according to claim 1, characterized in that, The connector includes a support foot, which is disposed at the bottom of the connector and is used to support the connector on the winding core.

5. The battery top cover structure according to claim 4, characterized in that, The support leg includes a connecting part and a supporting part. The bottom of the connector on both sides is provided with a connecting part, and the supporting part is vertically arranged at the bottom of the connecting part.

6. The battery top cover structure according to claim 2 or 3, characterized in that, The connector and the electrode tab are sealed together in the second through hole with sealant.

7. The battery top cover structure according to claim 1, characterized in that, The electrode tab is welded to the first connecting surface and the second connecting surface.

8. The battery top cover structure according to claim 1, characterized in that, The pole includes a column and a base plate. The column is provided with a mating through hole, and the base plate is provided with a central through hole. One end of the base plate is mated in the mating through hole, and the other end of the base plate is located at the bottom of the column and connected to the lower plastic limit at the bottom of the cover assembly.

9. The battery top cover structure according to any one of claims 1-8, characterized in that, The end of the pole is welded to the end of the connector to form a weld, and the width of the weld is ≥0.9mm; The pole and the connector satisfy the following relationship: 0.9mm ≤ the end width of the connector ≤ the end face width of the pole post - 0.6mm; The end width of the connector is less than or equal to the end length of the connector and the end face length of the pole post minus 0.6 mm.

10. A battery, characterized in that, Includes the battery top cover structure as described in any one of claims 1-9.

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