Battery top cover, battery monomer and battery pack

Abstract

The embodiment of the utility model discloses a battery top cover, a battery monomer and a battery pack. The battery top cover comprises a cover plate, a pole and an insulating sealing element, the pole is arranged on the cover plate in a penetrating manner through the insulating sealing element; the insulation sealing piece comprises a body part and an extension part arranged on one side of the body part in the Y direction, and the extension part is attached to the surface of the cover plate in the Z direction. According to the embodiment of the invention, the problem that the top cover and the box body are difficult to adhere in the cell mounting process is solved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery top cover, a battery cell and a battery pack. Background Art

[0002] When the top cover of an existing aluminum-shell battery is bonded to the battery box, it is usually necessary to set a limiting film or the like to control the thickness of the adhesive layer between the top cover and the box to prevent glue overflow. Since the limiting film is thin and long, it is difficult to install the limiting film. It is difficult to control the pasting position on both the top cover and the box. At the same time, during the movement of the battery core assembly, the limiting film is prone to dislocation and falling off, resulting in glue overflow or bonding failure, affecting the overall structural stability. Utility Model Content

[0003] This application aims to at least solve one of the technical problems existing in the prior art. For this purpose, this application provides a battery top cover, a battery cell and a battery pack to solve the problem of difficult bonding between the top cover and the box during the installation of the battery core.

[0004] In a first aspect, this application provides a battery top cover, including: a cover plate, a pole column and an insulating seal; the pole column passes through the cover plate through the insulating seal;

[0005] The insulating seal includes a body portion and an extension portion provided on one side of the body portion along the Y direction, and the extension portion is attached to the surface of the cover plate along the Z direction.

[0006] In an embodiment of the above battery top cover,

[0007] The extension portion is 0.3 - 2 mm higher than the cover plate surface in the Z direction.

[0008] In an embodiment of the above battery top cover,

[0009] In the Y direction, the distance from one side of the pole column to the corresponding edge of the cover plate is L1, and the length of the extension portion is L2, where 0.3L1 < L2 < 0.6L1.

[0010] In an embodiment of the above battery top cover,

[0011] In the X direction, the width of the pole column is W1, the width of the extension portion is W2, and the width of the cover plate is W3, where W1 < W2 < W3.

[0012] In an embodiment of the above battery top cover,

[0013] The cover plate is provided with a first installation hole for the body portion of the insulating seal to pass through; the insulating seal is provided with a second installation hole for the pole column to pass through;

[0014] The terminal post has a convex edge, the body part has a first clamping groove that matches and clamps with the convex edge, the first clamping groove is communicated with the second mounting hole, the terminal post passes through the second mounting hole and is clamped with the body part through the first clamping groove;

[0015] The body part is provided with a second clamping groove, the body part passes through the first mounting hole and is clamped with the cover plate through the second clamping groove.

[0016] In one embodiment of the above battery top cover,

[0017] The thickness of the body part on the surface of the cover plate is lower than the thickness of the terminal post and greater than the thickness of the extension part.

[0018] In one embodiment of the above battery top cover,

[0019] The extension part and the body part are of an integrally injection-molded structure.

[0020] In a second aspect, the present application provides a battery cell, including a housing and a battery top cover as described in any one of the first aspects mounted on the top of the housing along the Z direction.

[0021] In a third aspect, the present application provides a battery pack, including a box body and the battery cell as described in the second aspect;

[0022] A plurality of the battery cells are stacked along the X direction and the Y direction to form a battery module and are arranged in the box body.

[0023] In one embodiment of the above battery pack,

[0024] The box body includes a cavity formed by enclosing a bottom plate and a frame, and the battery module is arranged in the cavity;

[0025] The bottom plate is provided with a groove in the X direction, the terminal post of the battery cell faces the groove, and the depth of the groove is greater than the height of the terminal post protruding from the surface of the cover plate;

[0026] The extension part abuts against the bottom plate on both sides of the groove, so as to form a gap with the same height as the extension part between the bottom and the cover plate, and an adhesive layer is arranged in the gap.

[0027] One or more of the above embodiments of the present application have at least one or more of the following beneficial effects:

[0028] In the present application, the insulating seal between the terminal post in the top cover and the cover plate is extended to form an extension part that fits on the surface of the cover plate. This extension part is directly used as a spacer film to control the thickness of the adhesive layer, prevent glue overflow, eliminate the original spacer film, and thus there is no need for an additional spacer film, reducing the manufacturing cost, simplifying the assembly process, and improving the production efficiency of the product. Moreover, since the extension part is an extension of the insulating seal, it has a stable structure, is not prone to displacement, detachment, or deformation, effectively improving the structural stability of the product.

[0029] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] With reference to the accompanying drawings, the disclosure of the present application will become more readily understandable. It is easy for those skilled in the art to understand that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present application. In addition, similar numbers in the figures are used to represent similar components, where:

[0031] Figure 1 is a schematic perspective view of the top cover in an embodiment of the present application;

[0032] Figure 2 is a schematic top view of the top cover in an embodiment of the present application;

[0033] Figure 3 is an exploded schematic view of the top cover in an embodiment of the present application;

[0034] Figure 4 is a schematic perspective view of the insulating seal in an embodiment of the present application;

[0035] Figure 5 is a partial cross-sectional schematic view of the top cover in an embodiment of the present application;

[0036] Figure 6 is a schematic perspective view of a battery cell in an embodiment of the present application;

[0037] Figure 7 is a schematic perspective view of a battery pack in an embodiment of the present application;

[0038] Figure 8 is a schematic perspective view of a box body in an embodiment of the present application;

[0039] Figure 9 is a cross-sectional schematic view of a battery pack in an embodiment of the present application;

[0040] Figure 10 is Figure 9 an enlarged schematic view of a partial area A therein. Detailed implementation manners

[0041] Some embodiments of the present application will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present application and are not intended to limit the protection scope of the present application.

[0042] It should be noted that in the description of the present application, the terms indicating the direction or positional relationship such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the direction or positional relationship shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0043] In addition, it should also be noted that in the description of the present application, unless otherwise clearly specified and limited, the terms "installation", "setting", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can also be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0044] As described in the background art, currently, when a battery cell is bonded to a battery box, a spacer film is used to control the thickness of the adhesive layer to prevent glue overflow. However, the spacer film is difficult to install and is prone to displacement, the pasting position is difficult to control, and it is easy to fall off, resulting in difficulty in bonding the battery cell to the box, affecting the structural stability of the product and the production efficiency. Based on this, the present application proposes a battery top cover to solve the problem of difficult bonding between the top cover and the box during the installation of the battery cell, thereby improving the structural stability of the product and the production efficiency.

[0045] Refer to the attached Figure 1 , Figure 1 is a schematic perspective view of a battery top cover according to an embodiment of the present application. As Figure 1As shown in the figure, the present application provides a battery top cover, including: a cover plate 1, a pole column 2, and an insulating seal 3; the pole column 2 passes through the cover plate 1 through the insulating seal 3; the insulating seal 3 includes a main body portion 31 and an extension portion 32 provided on one side of the main body portion 31 in the Y direction, and the extension portion 32 is attached to the surface of the cover plate 1 in the Z direction. The purpose of the present application is to form an extension portion 32 attached to the surface of the cover plate 1 by extending the insulating seal 3 between the pole column 2 and the cover plate 1 in the top cover, directly using the extension portion 32 as a limiting film to control the thickness of the adhesive layer, prevent glue overflow, cancel the original limiting film, eliminate the need for an additional limiting film, reduce manufacturing costs, simplify the assembly process, and improve the production efficiency of the product; and since the extension portion 32 is an extension of the insulating seal 3, the structure is stable, not prone to displacement, falling off, and deformation, effectively improving the structural stability of the product.

[0046] In one embodiment, the extension portion 32 is 0.3 - 2 mm higher than the surface of the cover plate 1 in the Z direction. In order to ensure the thickness of the adhesive layer between the battery top cover and the box body, the extension portion 32 needs to have a certain height, which limits the thickness of the adhesive layer. If it is too low, the bonding stability between the top cover and the box body cannot be ensured; if it is too high, it will affect the normal assembly space height, requiring the box body to have a larger volume space. Therefore, the extension portion 32 is 0.3 - 2 mm higher than the surface of the cover plate 1 in the Z direction, which not only ensures the bonding stability but also does not affect the normal use of the assembly space.

[0047] In one embodiment, referring to the attached Figure 1 and Figure 2 , in the Y direction, the distance from one side of the pole column 2 to the corresponding edge of the cover plate 1 is L1, and the length of the extension portion 32 is L2. Among them, 0.3L1 < L2 < 0.6L1. The length of the extension portion 32 needs to be less than L1, but if it is too small, it cannot limit the thickness of the adhesive layer and may cause glue overflow; if it is too long, it will affect the area of the adhesive layer and cannot ensure the bonding stability between the top cover and the box body. Therefore, the extension portion 32 is set to satisfy 0.3L1 < L2 < 0.6L1, which can not only effectively limit the thickness of the adhesive layer but also does not affect the size of the adhesive layer area, ensuring the bonding stability.

[0048] In one embodiment, referring to the attached Figure 1 and Figure 2 , in the X direction, the width of the pole column 2 is W1, the width of the extension portion 32 is W2, and the width of the cover plate is W3. Among them, W1 < W2 < W3. The insulating seal 3 needs to surround the pole column 2 to play an insulating role between the pole column 2 and the cover plate 1. Therefore, the width of the main body portion 31 of the insulating seal 3 needs to be greater than the width of the pole column 2. As a part of the insulating seal 3 formed by extension, the width of the extension portion 32 can be the same as the width of the main body portion 31, that is, both are W2, or slightly smaller or slightly larger than the width of the main body portion 31, but should not exceed the width of the cover plate 1 and be less than the width of the pole column 2.

[0049] In one embodiment, referring to the attached Figures 3 - 5 , the cover plate 1 is provided with a first mounting hole 11 for the body portion 31 of the insulating seal 3 to pass through; the insulating seal 3 is provided with a second mounting hole 33 for the pole column 2 to pass through;

[0050] The pole column 2 has a convex edge 21, and the body portion 31 has a first card slot 311 that is matched and clamped with the convex edge 21. The first card slot 311 is communicated with the second mounting hole 33. The pole column 2 is inserted into the second mounting hole 33 and is clamped with the body portion 31 through the first card slot 311;

[0051] The body portion 31 is provided with a second card slot 312. The body portion 31 is inserted into the first mounting hole 11 and is clamped with the cover plate 1 through the second card slot 312.

[0052] Specifically, in the assembly process of a possible battery top cover, the insulating seal 3 can be first passed through the first mounting hole 11, and the second card slot 312 and the edge of the first mounting hole 11 of the cover plate 1 form a mutual clamping relationship to achieve a firm installation between the insulating seal 3 and the cover plate 1; then the pole column 2 is passed through the second mounting hole 33 of the insulating seal 3, and the convex edge 21 of the pole column 2 is clamped with the first card slot 311 to achieve a firm installation between the pole column 2 and the insulating seal 3, and the assembly of the entire top cover is completed. During the assembly process, the extension portion 32 needs to extend in the Y direction towards both sides of the cover plate 1 to achieve the purpose of restricting the thickness of the adhesive layer between the top cover and the battery box body. It should be understood that usually two pole columns 2 are provided on the top cover, and the two pole columns 2 are symmetrically arranged in both the Y direction and the X direction, and the extension portions 32 of the two pole columns 2 extend in opposite directions in the Y direction; based on the cooperation of the above-mentioned card slots and structures, a stable installation among the cover plate 1, the pole column 2, and the insulating seal 3 can be achieved.

[0053] In one embodiment, referring to Figures 1 - 5 , the thickness of the body portion 31 on the surface of the cover plate 1 is lower than the thickness of the pole column 2 and greater than the thickness of the extension portion 32. The body portion 31 of the insulating seal 3 needs to ensure the insulation between the pole column 2 and the cover plate 1. The thicker the thickness, the higher the insulation and sealing performance. However, in order not to affect the normal use of the pole column 2, it should be less than the thickness of the pole column 2. At the same time, the extension portion 32 serves to control the thickness of the adhesive layer and only needs to meet the required thickness of the adhesive layer. Therefore, it does not need to be too thick and is set to be less than the thickness of the body portion 31.

[0054] In one embodiment, referring to Figures 1 - 5 , the extension portion 32 and the body portion 31 are an integrally injection-molded structure. Using a nano-injection molding process, the integral structure has high strength and is not easy to fall off and deform. It can not only improve the structural stability of the structure for controlling the adhesive layer thickness, but also improve the installation stability between the pole column 2 and the cover plate 1.

[0055] Further, referring to Figure 6 , the present application provides a battery cell, including a housing 4 and the battery top cover as described above mounted on the top of the housing 4 along the Z direction.

[0056] Specifically, the battery cell as a whole is usually a hexahedron structure, and the housing 4 and the top cover form this hexahedron structure. For the specific structure of the top cover, refer to the specific implementation manner of the above-mentioned battery top cover, and the repeated parts will not be elaborated. The extension 32 of the insulating seal 3 extends towards both sides of the cover plate 1 to limit the thickness and position of the adhesive layer on the cover plate 1.

[0057] In one embodiment, the housing 4 has an insulating coating, and the insulating coating covers at least five planes except the top cover, improving the safety of the battery cell.

[0058] Further, referring to Figure 7 , the present application provides a battery pack, including a box body 5 and the battery cell as described above;

[0059] A plurality of battery cells are stacked in the X direction and the Y direction to form a battery module and are arranged in the box body 5.

[0060] Specifically, as shown in the battery cell Figure 6 , a battery module is installed in the battery pack. The top cover of each battery cell is installed towards the bottom of the box body 5, that is, the pole column 2 is installed towards the bottom of the box body 5. An adhesive layer needs to be bonded between the cover plate 1 and the bottom of the box body 5. The extension 32 of the insulating seal 3 as described above restricts the thickness and position of the adhesive layer. For the specific structure and setting of the insulating seal 3 and the extension 32, refer to the specific implementation manner of the above-mentioned battery top cover, and the repeated parts will not be elaborated.

[0061] In one embodiment, referring to Figures 7 - 10 shown, the box body 5 includes a cavity formed by enclosing a bottom plate 51 and a frame 52, and the battery module is arranged in the cavity;

[0062] The bottom plate 51 is provided with a groove 511 in the X direction, and the pole column 2 of the battery cell is arranged towards the groove 511. The depth of the groove 511 is greater than the height of the pole column 2 protruding from the surface of the cover plate 1;

[0063] The extension 32 abuts against the bottom plate 51 on both sides of the groove 511, so as to form a gap with the same height as the extension 32 between the bottom plate 51 and the cover plate 1, and an adhesive layer 6 is arranged in the gap.

[0064] Specifically, refer to Figure 10Partial enlarged view of part of the bonding layer 6. The position of the terminal post 2 corresponds to the position of the groove 511. The protruding part of the terminal post 2 is within the groove 511. The extending part 32 abuts against the bottom plates 51 on both sides of the groove 511, so that a fixed gap is formed between the bottom plate 51 and the cover plate 1. This gap serves to limit the thickness between the two sides of the cover plate 1 and the bottom plate 51. In the thickness gap corresponding to the extending part 32, a colloid is filled to form the bonding layer 6. The bonding layer 6 can be a structural adhesive. The insulating seal 3 between the terminal post 2 and the cover plate 1 extends to the bonding area, and the extending part 32 is directly used as a spacer film to control the thickness of the glue layer and prevent glue overflow. Further, the clamping edge at the junction of the body part 31 and the extending part 32 of the insulating seal 3 just engages with the side corner of the groove 511, improving the installation stability between the battery cell and the box body 5. It should be understood that Figures 7 - 10 It is only a schematic diagram of part of the structure of the battery pack. The battery pack also includes other components not shown in the figure, such as other electrical components BMS and BDU of the battery and various connecting devices, etc.

[0065] In one embodiment, an insulating layer is further provided on the surface of the bottom plate 51 of the box body 5 close to the battery cell. The insulating layer can be an adhesive insulating sheet, electrophoresis or insulating material spraying, improving the overall safety of the battery pack.

[0066] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0067] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A battery top cover, characterized in that, Comprising: A cover plate (1), a terminal post (2) and an insulating seal (3); the terminal post (2) passes through the cover plate (1) via the insulating seal (3); The insulating seal (3) includes a body portion (31) and an extension portion (32) disposed on one side of the body portion (31) along the Y direction, and the extension portion (32) is adhesively attached to the surface of the cover plate (1) along the Z direction.

2. The battery top cover according to claim 1, wherein The extension portion (32) is 0.3 - 2 mm higher than the surface of the cover plate (1) in the Z direction.

3. The battery top cover according to claim 1, characterized in that, In the Y direction, the distance from one side of the terminal post (2) to the edge of the corresponding cover plate (1) is L1, and the length of the extension portion (32) is L2, where 0.3L1 < L2 < 0.6L1.

4. The battery top cover according to claim 1, characterized in that, In the X direction, the width of the terminal post (2) is W1, the width of the extension portion (32) is W2, and the width of the cover plate is W3, where W1 < W2 < W3.

5. The battery top cover according to claim 1, characterized in that, The cover plate (1) is provided with a first mounting hole (11) for the body portion (31) of the insulating seal (3) to pass through; the insulating seal (3) is provided with a second mounting hole (33) for the terminal post (2) to pass through; The terminal post (2) has a convex edge (21), and the body portion (31) has a first card slot (311) that is matingly engaged with the convex edge (21), and the first card slot (311) is communicated with the second mounting hole (33). The terminal post (2) passes through the second mounting hole (33) and is snap - fitted with the body portion (31) through the first card slot (311); The body portion (31) is provided with a second card slot (312), and the body portion (31) passes through the first mounting hole (11) and is snap - fitted with the cover plate (1) through the second card slot (312).

6. The battery top cover according to claim 1, characterized in that, The thickness of the body portion (31) on the surface of the cover plate (1) is lower than the thickness of the terminal post (2) and greater than the thickness of the extension portion (32).

7. The battery top cover according to any one of claims 1-6, characterized in that, The extension portion (32) and the body portion (31) are an integrally injection - molded structure.

8. A battery cell, characterized in that, Comprising a housing (4) and a battery top cover as described in any one of claims 1 - 7 mounted on the top of the housing (4) along the Z direction.

9. A battery pack, characterized in that, Comprising a box body (5) and a battery cell as described in claim 8; A plurality of the battery cells are stacked in the X direction and the Y direction to form a battery module and are arranged in the box body (5).

10. The battery pack according to claim 9, characterized in that, The box body (5) includes a cavity formed by enclosing a bottom plate (51) and a frame (52), and the battery module is arranged in the cavity; The bottom plate (51) is provided with a groove (511) in the X direction, the terminal post (2) of the battery cell faces the groove (511), and the depth of the groove (511) is greater than the height of the terminal post (2) protruding from the surface of the cover plate (1); The extension portion (32) abuts against the bottom plate (51) on both sides of the groove (511), so as to form a gap with the same height as the extension portion (32) between the bottom plate (51) and the cover plate (1), and an adhesive layer (6) is provided in the gap.

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