Battery cover plate and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cover plate and a battery. The battery cover plate comprises a cover plate body provided with a via hole; the electrode assembly is arranged on the cover plate body and is suitable for being electrically connected with the electrode group, and at least part of the electrode assembly extends out of the cover plate body through the via hole; the rubber mat is arranged between the electrode assembly and the cover plate body; the heat insulation layer is arranged on at least one side, exposed outside, of the rubber mat, and the position, provided with the heat insulation layer, of the rubber mat is close to the edge of the cover plate body. The heat insulation layer is arranged at the position, exposed outside, of the rubber mat, heat generated when the edge position of the cover plate body and a battery shell are welded is isolated, the rubber mat is prevented from being burnt or even melted due to the influence of high temperature, and the rubber mat is protected. Therefore, the problem that the sealing performance is affected due to the fact that heat generated during welding of the battery cover plate and the battery shell easily causes burning and even melting of the rubber mat is solved.

Description

Technical Field

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

[0002] The battery cover includes a cover body welded to the battery shell, and a rubber pad, a pole and a pole block installed on the cover body. The pole extends out of the cover body through the through hole on the cover body and is assembled with the pole block. The rubber pad is arranged between the pole block and the cover body to block the gap between the cover body and the pole at the through hole to ensure that the assembled battery has good sealing.

[0003] For some smaller and flatter batteries, such as Figure 7 , Figure 8 As shown, the battery cover is also relatively narrow. When the rubber pad is assembled at the pole position, the distance between the rubber pad and the connection between the battery cover and the battery shell is very small. When the battery cover and the battery shell are welded, a large amount of heat will be generated, which may easily cause the rubber pad to burn or even melt, thereby affecting its sealing performance for the battery cover, causing the battery to be charged and reducing the battery safety performance. Utility Model Content

[0004] In view of this, the utility model provides a battery cover to solve the problem that the heat generated during welding of the battery cover and the battery shell easily causes the rubber pad to burn or even melt, thereby affecting its sealing performance.

[0005] At the same time, the utility model provides a battery to solve the problem that the heat generated during welding of the battery cover and the battery shell easily causes the rubber pad to burn or even melt, thereby affecting its sealing performance.

[0006] In a first aspect, the utility model provides a battery cover, comprising: a cover body, provided with a through hole; an electrode assembly, arranged on the cover body and suitable for being electrically connected to the electrode group, the electrode assembly at least partially extending out of the cover body through the through hole; a rubber pad, arranged between the electrode assembly and the cover body; a heat insulating layer, arranged on at least one side of the rubber pad exposed to the outside, the rubber pad being arranged at a position close to the edge of the cover body.

[0007] Beneficial effect: The utility model provides a battery cover plate, which provides a heat insulation layer at the position where the rubber pad is exposed to the outside, thereby isolating the heat generated when the edge of the cover plate body is welded with the battery shell, preventing the rubber pad from being burned or even melted due to high temperature, and protecting the rubber pad. This solves the problem that the heat generated when welding the battery cover plate and the battery shell easily causes the rubber pad to be burned or even melted, affecting its sealing performance.

[0008] In an optional embodiment, the heat insulation layer is annular and is disposed on the outer peripheral side of the rubber pad exposed to the outside.

[0009] Beneficial effects: The thermal insulation layer is arranged as an annular structure and is arranged on the peripheral side of the rubber pad exposed to the outside world, so as to insulate all positions of the rubber pad exposed to the outside world, thereby further improving the thermal insulation protection effect of the thermal insulation layer on the rubber pad; at the same time, the thermal insulation layer with an annular structure is convenient for direct assembly on the electrode assembly.

[0010] In an optional embodiment, the thermal insulation layer is bonded to the rubber pad by heat-resistant glue.

[0011] Beneficial effect: When the thermal insulation layer is set as a soft thermal insulation material, the thermal insulation layer is adhered to the outer peripheral side of the rubber pad through heat-resistant glue, thereby further enhancing the thermal insulation effect of the thermal insulation layer.

[0012] In an optional embodiment, the thermal insulation layer or the rubber pad is provided with a protrusion, and the protrusion is provided on a side surface where the thermal insulation layer and the rubber pad are close to each other, and the thermal insulation layer is sleeved on the outer peripheral side of the rubber pad by the protrusion for interference fit.

[0013] Beneficial effect: When the thermal insulation layer is set as a hard thermal insulation material, the protrusion is provided so that an interference fit is generated when the thermal insulation layer is sleeved on the outer peripheral side of the rubber pad, so that the thermal insulation layer and the rubber pad are tightly connected to prevent the thermal insulation layer from moving or even falling off.

[0014] In an optional embodiment, the thickness of the thermal insulation layer is 0.1 mm-0.2 mm.

[0015] In an optional embodiment, the electrode assembly includes: a pole, which is partially arranged under the cover body, and the conductive block of the pole extends out of the cover body through the via hole; a pole block, which is installed on the conductive block and electrically connected to the conductive block, the rubber pad is located between the pole block and the cover body, and the top height of the thermal insulation layer is higher than the top height of the rubber pad.

[0016] Beneficial effects: After the part of the pole arranged below the cover body is electrically connected to the pole group, the conductive block extends out of the cover body through the via hole and is electrically connected to the pole block, and is electrically connected to an external electrical device through the pole block for use; the top height of the thermal insulation layer is higher than the top height of the rubber pad, so as to provide sufficient thermal insulation protection for the thermal insulation layer.

[0017] In an optional embodiment, the rubber pad is provided with a groove, the pole block is provided with a convex portion matching with the groove, the convex portion is embedded in the groove, and the pole block and the rubber pad are circumferentially flush.

[0018] Beneficial effect: The stability of the rubber pad between the pole block and the cover plate body is improved by the limiting cooperation between the groove of the rubber pad and the protrusion of the pole block. The pole block and the rubber pad are arranged flush in the circumferential direction to improve the aesthetics, and at the same time, it is convenient to fasten the insulation layer on the outer peripheral side of the rubber pad or the pole block.

[0019] In an optional embodiment, the cover plate body is integrally formed with an explosion-proof valve, and the explosion-proof valve is formed by punching and engraving at least a partial area of ​​the cover plate body.

[0020] Beneficial effect: The explosion-proof valve integrally formed on the cover body serves to relieve pressure when the battery expands to the limit due to overpressure.

[0021] In a second aspect, the utility model further provides a battery, comprising the battery cover described in any one of the above embodiments, and a battery shell welded to the battery cover, wherein a pole group is arranged in the battery shell.

[0022] Because the battery includes a battery cover plate, it has the same effect as the battery cover plate and is not described in detail here.

[0023] In an optional embodiment, the battery is a lithium-ion power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A top view of a battery cover provided by the utility model;

[0026] Figure 2 A partial exploded view of a battery cover provided by the utility model;

[0027] Figure 3 An exploded view of a battery cover provided by the utility model;

[0028] Figure 4 for Figure 1 Sectional view along AA direction;

[0029] Figure 5 for Figure 4 A partial enlarged view of the M in the middle;

[0030] Figure 6 for Figure 1 Cross-sectional view along the BB direction;

[0031] Figure 7 A schematic diagram of the structure of a battery provided by the utility model;

[0032] Figure 8 for Figure 7 A local enlarged view of point N in the middle.

[0033] Description of reference numerals:

[0034] 1. Cover plate body; 101. Through hole;

[0035] 2. electrode assembly; 201. pole; 2011. conductive block; 202. pole block; 2021. convex portion;

[0036] 3. Rubber pad; 301. Groove;

[0037] 4. Thermal insulation layer;

[0038] 5. Explosion-proof valve;

[0039] 100. Battery cover;

[0040] 200. Battery casing. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0042] Combine the following Figure 1-Figure 6 , describing an embodiment of the utility model.

[0043] According to an embodiment of the present utility model, on the one hand, a battery cover is provided, such as Figure 1-Figure 3 As shown, it includes: a cover body 1, an electrode assembly 2, a rubber pad 3 and a heat insulation layer 4.

[0044] The cover body 1 is provided with a through hole 101; the electrode assembly 2 is arranged on the cover body 1 and is suitable for being electrically connected to the electrode group, and the electrode assembly 2 at least partially extends out of the cover body 1 through the through hole 101; the rubber pad 3 is arranged between the electrode assembly 2 and the cover body 1; the heat insulation layer 4 is arranged on at least one side of the rubber pad 3 exposed to the outside world, and the position where the heat insulation layer 4 is arranged on the rubber pad 3 is close to the edge of the cover body 1.

[0045] Specifically, Figure 1-Figure 3As shown, after the electrode assembly 2 is electrically connected to the electrode group, it extends out of the cover body 1 through the through hole 101, so that the electrode group can be electrically connected to the external electrical device through the electrode assembly 2 for use. In order to facilitate the assembly between the structural parts, there will be a gap between the through hole 101 of the cover body 1 and the electrode assembly 2 after assembly. In order to prevent the leakage of liquid and gas inside the battery and ensure the sealing performance of the battery, it is necessary to set a rubber pad 3 between the electrode assembly 2 and the cover body 1 to seal the gap. Since the edge position of the cover body 1 needs to be welded to the battery shell, the heat insulation layer 4 is set on at least one side of the rubber pad 3 exposed to the outside world, and the position of the rubber pad 3 to set the heat insulation layer 4 is close to the edge of the cover body 1. The heat insulation layer 4 is used to isolate a large amount of heat generated during welding, thereby preventing the rubber pad 3 from being burned or even melted due to the influence of high temperature, and protecting the rubber pad 3.

[0046] Furthermore, since not every position of the electrode assembly 2 is very close to the edge of the cover body 1 during assembly, the rubber pad 3 is also at different distances from the edge of the cover body 1 after assembly. It is undeniable that when the rubber pad 3 is far from the edge of the cover body 1, the heat generated by welding has little effect on the rubber pad 3 at that side. Therefore, the heat insulation layer 4 can be set as a strip structure, and the heat insulation layer 4 can be set on one or more sides of the rubber pad 3 exposed to the outside and close to the edge of the cover body 1, so as to protect the position where the heat generated by welding affects the rubber pad 3 the most. In the battery cover provided in this embodiment, Figure 1 , Figure 2 As shown, the upper surface of the electrode assembly 2 exposed from the cover body 1 is rectangular, and the sides where the two longer sides of the rectangle are located are close to the edges of the cover body 1. Therefore, in this embodiment, a heat insulation layer 4 can be set on the above two sides of the electrode assembly 2.

[0047] Furthermore, the thermal insulation layer 4 can be made of soft thermal insulation materials, such as silicone, asbestos, etc.; it can also be made of hard thermal insulation materials, such as glass fiber, carbon fiber, etc.; it can also be made of a combination of hard materials and thermal insulation materials, as long as the thermal insulation layer 4 has good thermal insulation performance.

[0048] Furthermore, if Figure 2 , Figure 3 As shown, the rubber pad 3 is an upper plastic disposed between the cover body 1 and the electrode assembly 2 , and the upper plastic is disposed between the outer side of the cover body 1 and the electrode assembly 2 for sealing.

[0049] Furthermore, the heat insulation layer 4 is made of insulating material, which can prevent the rubber pad 3 from directly contacting the outside, thereby improving the safety of the electrode group.

[0050] Furthermore, the cover body 1 is configured as a plain aluminum sheet.

[0051] This embodiment provides a battery cover, which provides a heat insulation layer 4 at the position where the rubber pad 3 is exposed to the outside, thereby isolating the heat generated when the edge of the cover body 1 is welded to the battery shell, preventing the rubber pad 3 from being burned or even melted due to high temperature, and protecting the rubber pad 3. This solves the problem that the heat generated when the battery cover and the battery shell are welded easily causes the rubber pad 3 to be burned or even melted, thereby affecting its sealing performance.

[0052] At the same time, the heat insulation layer 4 is a thin-walled structure, which has little impact on the battery manufacturing process when it is set on the electrode assembly 2, and is convenient for production and automated production.

[0053] In one embodiment, Figure 1-Figure 3 As shown, the heat insulation layer 4 is annular and is arranged on the outer peripheral side of the rubber pad 3 exposed to the outside.

[0054] Specifically, Figure 1-Figure 3 As shown, the thermal insulation layer 4 is configured as an annular structure and is disposed on the peripheral side of the rubber pad 3 exposed to the outside, thereby insulating all positions of the rubber pad 3 exposed to the outside, further improving the thermal insulation protection effect of the thermal insulation layer 4 on the rubber pad 3; at the same time, the thermal insulation layer 4 with an annular structure is convenient for direct assembly on the electrode assembly 2.

[0055] Furthermore, if Figure 1-Figure 3 As shown, the annular structure of the thermal insulation layer 4 is adapted to the outer peripheral contour of the portion of the electrode assembly 2 that is exposed from the cover plate body 1 and the outer peripheral contour of the rubber pad 3, so that the thermal insulation layer 4 is sleeved on the outer peripheral side of the rubber pad 3 after passing through the electrode assembly 2, so that the thermal insulation layer 4 and the rubber pad 3 can fit tightly, further enhancing the thermal insulation effect of the thermal insulation layer 4.

[0056] In one embodiment, Figure 1 As shown, the heat insulation layer 4 is bonded to the rubber pad 3 by heat-resistant glue.

[0057] Specifically, Figure 1 As shown, when the heat insulation layer 4 is set as a soft heat insulation material, the heat insulation layer 4 is adhered to the outer peripheral side of the rubber pad 3 by heat-resistant glue, so as to further enhance the heat insulation effect of the heat insulation layer 4.

[0058] Furthermore, the heat-resistant adhesive can be directly provided as the heat-resistant adhesive backing on the surface of one side of the heat-insulating layer 4 to be bonded to the adhesive pad 3 .

[0059] In one embodiment, the thermal insulation layer 4 or the rubber pad 3 is provided with a protrusion, which is provided on the surface of one side where the thermal insulation layer 4 and the rubber pad 3 are close to each other, and the thermal insulation layer 4 is sleeved on the outer peripheral side of the rubber pad 3 with an interference fit by the protrusion.

[0060] Specifically, when the thermal insulation layer 4 is set as a hard thermal insulation material, a protrusion is provided so that an interference fit is generated when the thermal insulation layer 4 is sleeved on the outer peripheral side of the rubber pad 3, so that the thermal insulation layer 4 is tightly connected to the rubber pad 3 to prevent the thermal insulation layer 4 from moving or even falling off.

[0061] Further, the protrusion is configured as a convex rib.

[0062] In one embodiment, the thickness of the heat insulation layer 4 is 0.1 mm-0.2 mm.

[0063] Specifically, the thickness of the heat insulating layer 4 is preferably 0.12 mm.

[0064] In one embodiment, Figure 3 , Figure 4 As shown, the electrode assembly 2 includes: a pole 201 and a pole block 202 .

[0065] The pole 201 is partially arranged below the cover body 1, and the conductive block 2011 of the pole 201 extends out of the cover body 1 through the through hole 101; the pole block 202 is installed on the conductive block 2011 and is electrically connected to the conductive block 2011, the rubber pad 3 is located between the pole block 202 and the cover body 1, and the top height of the insulation layer 4 is higher than the top height of the rubber pad 3.

[0066] Specifically, Figure 3 , Figure 4 As shown, after the part of the pole 201 disposed below the cover body 1 is electrically connected to the pole group, the conductive block 2011 extends out of the cover body 1 through the via 101 and is electrically connected to the pole block 202, and is electrically connected to the external electrical device through the pole block 202 for use; Figure 5 , Figure 6 As shown, the top height of the heat insulation layer 4 is higher than the top height of the rubber pad 3 , so as to provide sufficient heat insulation protection for the heat insulation layer 4 .

[0067] Furthermore, this embodiment does not limit the specific position where the top height of the thermal insulation layer 4 is higher than the top height of the rubber pad 3. As the most preferred embodiment, the thermal insulation layer 4 covers the entire peripheral side of the rubber pad 3 and the pole block 202, that is, the top position of the thermal insulation layer 4 is flush with the top position of the pole block 202.

[0068] Furthermore, if Figure 5 , Figure 6As shown, as an alternative embodiment, at the peripheral side of the rubber pad 3 and the pole block 202, the overall height of the rubber pad 3 and the pole block 202 is defined as H. Since the design height of the thermal insulation layer 4 is generally 0.5H-0.6H, taking the height of the thermal insulation layer 4 as 0.6H as an example, it is necessary to set the overall height of the thermal insulation layer 4 to at least 0.75H, so that the top height of the thermal insulation layer 4 is at least 0.15H higher than the top height of the rubber pad 3, thereby ensuring that the thermal insulation layer 4 can effectively provide thermal insulation protection under extreme conditions, while maximizing the saving of materials for the thermal insulation layer 4 to save costs.

[0069] Furthermore, the heat insulating layer 4 may be fastened to the outer peripheral side of one of the rubber pad 3 and the pole block 202 , or may be fastened to the outer peripheral sides of the rubber pad 3 and the pole block 202 at the same time.

[0070] Furthermore, when the heat insulation layer 4 and the pole block 202 are fastened together, heat-resistant glue may be used for direct connection or interference fit connection may be used.

[0071] In one embodiment, Figure 3 , Figure 4 As shown, the rubber pad 3 is provided with a groove 301 , the pole block 202 is provided with a convex portion 2021 matched with the groove 301 , the convex portion 2021 is embedded in the groove 301 , and the pole block 202 and the rubber pad 3 are circumferentially flush.

[0072] Specifically, Figure 3 , Figure 4 As shown, the stability of the rubber pad 3 between the pole block 202 and the cover plate body 1 is improved by the limiting cooperation between the groove 301 of the rubber pad 3 and the protrusion 2021 of the pole block 202. The pole block 202 and the rubber pad 3 are circumferentially flush to improve the aesthetics, and at the same time, it is convenient to fasten the thermal insulation layer 4 on the outer peripheral side of the rubber pad 3 or the pole block 202.

[0073] In one embodiment, Figure 1-Figure 3 As shown, the cover body 1 is integrally formed with an explosion-proof valve 5 , and the explosion-proof valve 5 is formed by punching and engraving grooves in at least a partial area of ​​the cover body 1 .

[0074] Specifically, Figure 1-Figure 3 As shown, the explosion-proof valve 5 integrally formed with the cover body 1 plays a role in relieving pressure when the battery expands to the limit due to overpressure.

[0075] According to an embodiment of the present utility model, on the other hand, a battery is also provided, such as Figure 7 , Figure 8 As shown, it includes a battery cover plate 100 according to any of the above embodiments, and a battery casing 200 welded to the battery cover plate 100 , and the electrode group is arranged in the battery casing 200 .

[0076] In one embodiment, Figure 7 As shown, the battery is a lithium-ion power battery.

[0077] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery cover, characterized in that: include: The cover plate body is provided with a through hole; An electrode assembly, disposed on the cover body and adapted to be electrically connected to the electrode group, wherein at least a portion of the electrode assembly extends out of the cover body through the via hole; A rubber pad, disposed between the electrode assembly and the cover plate body; The heat insulating layer is arranged on at least one side of the rubber pad exposed to the outside, and the position where the heat insulating layer is arranged on the rubber pad is close to the edge of the cover body.

2. The battery cover according to claim 1, characterized in that: The heat insulation layer is annular and is arranged on the outer peripheral side of the rubber pad exposed to the outside.

3. The battery cover according to claim 2, characterized in that: The heat insulation layer is bonded to the rubber pad by heat-resistant glue.

4. The battery cover according to claim 2, characterized in that: The heat insulating layer or the rubber pad is provided with a protrusion, and the protrusion is provided on a surface of a side where the heat insulating layer and the rubber pad are close to each other. When the heat insulating layer is sleeved on the outer peripheral side of the rubber pad, the protrusion is interference fit.

5. The battery cover according to any one of claims 1 to 4, characterized in that: The thickness of the heat insulation layer is 0.1 mm-0.2 mm.

6. The battery cover according to any one of claims 1 to 4, characterized in that: The electrode assembly comprises: A pole, partly disposed below the cover body, wherein a conductive block of the pole extends out of the cover body through the via hole; A pole block is installed on the conductive block and electrically connected to the conductive block, the rubber pad is located between the pole block and the cover body, and the top height of the thermal insulation layer is higher than the top height of the rubber pad.

7. The battery cover according to claim 6, characterized in that: The rubber pad is provided with a groove, the pole block is provided with a convex portion matched with the groove, the convex portion is embedded in the groove, and the pole block and the rubber pad are circumferentially flush.

8. The battery cover according to any one of claims 1 to 4, characterized in that: The cover plate body is integrally formed with an explosion-proof valve, and the explosion-proof valve is formed by punching and engraving grooves in at least a partial area of ​​the cover plate body.

9. A battery, characterized in that: The invention comprises a battery cover plate as claimed in any one of claims 1 to 8, and a battery shell welded to the battery cover plate, wherein a pole group is arranged in the battery shell.

10. The battery according to claim 9, characterized in that The battery is a lithium-ion power battery.

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