Battery cover plate, top cover assembly and battery

Abstract

The utility model relates to a battery cover plate, a top cover assembly and a battery. The battery cover plate comprises a cover plate body, a first assembly sinking table, an accommodating hole and a first flange, the cover plate body comprises a first surface and a second surface which are oppositely arranged in the thickness direction of the cover plate body. The first assembly sinking table is arranged on the cover plate body, and the first assembly sinking table is formed by sinking from the first surface to one side of the second surface; the accommodating hole is formed in the bottom wall of the first assembly sinking table, and the accommodating hole penetrates through the cover plate body to the second surface; the first flange is arranged on the second surface, the first flange is arranged around the containing hole, and the first flange is formed by protruding from the first surface to one side of the second surface. According to the battery cover plate, the top cover assembly and the battery disclosed by the utility model, the structural strength of the cover plate is ensured by arranging the first flange, the deformation of the accommodating hole is avoided, and the safety performance of the battery is ensured.

Description

Technical Field

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

[0002] With the development of the new energy industry, electric vehicles have been favored by consumers due to their advantages such as no pollution, low noise, and high energy efficiency. When choosing electric vehicles, safety is one of the main concerns of consumers. As the main power source of electric vehicles, the safety performance of batteries has become the focus that new energy companies need to consider when designing batteries.

[0003] In order to ensure the safety of the battery during use, a safety valve is usually installed on the battery. There is an explosion-proof notch on the safety valve. When the battery thermally runs away, the safety valve ruptures from the explosion-proof notch and releases pressure to reduce the pressure inside the battery and avoid explosion accidents.

[0004] Taking square batteries as an example, a receiving hole is provided on the cover plate of the square battery, and a safety valve is arranged in the receiving hole of the cover plate. Since the safety valve and the cover plate are split structures, during the assembly process of the two, it is often necessary to fix the safety valve to the cover plate by welding. However, in order to ensure a certain pressure relief area, the size of the safety valve is relatively large. When facing the cover plate of the square battery, the distance between the edge of the receiving hole and the edge of the cover plate along the width direction of the cover plate is small; at the same time, the thickness of the cover plate itself is relatively thin. Therefore, when affected by factors such as welding temperature, the parts on both sides of the receiving hole along the width direction of the cover plate are prone to deformation, which not only affects the assembly of the safety valve and the cover plate, but also easily causes deformation of the safety valve or premature pressure relief. Utility Model Content

[0005] To this end, the technical problem to be solved by the utility model is to overcome the problem that the existing cover plate is easily deformed when welding and assembling the safety valve, and to provide a battery cover plate, a top cover assembly and a battery. By setting a first flange, the structural strength of the cover plate is ensured, deformation of the accommodating hole is avoided, and the safety performance of the battery is ensured.

[0006] The utility model provides a battery cover, including a cover body, the cover body including a first surface and a second surface arranged opposite to each other along the thickness direction thereof; a first assembly sinker, the first assembly sinker is arranged on the cover body, and the first assembly sinker is formed by being recessed from the first surface to one side of the second surface; an accommodating hole, the accommodating hole is arranged on the bottom wall of the first assembly sinker, and the accommodating hole passes through the cover body to the second surface; a first flange, the first flange is arranged on the second surface, the first flange is arranged around the accommodating hole, and the first flange is formed by being protruded from the first surface to one side of the second surface.

[0007] In an embodiment of the present invention, the accommodating hole and the first flange are both provided with a first rounded corner.

[0008] In one embodiment of the utility model, it also includes a second assembly sinker, which is arranged on the first surface, and the second assembly sinker is recessed from the first surface to one side of the second surface, and the first assembly sinker is arranged on the bottom wall of the second assembly sinker, and the diameter of the first assembly sinker is smaller than the diameter of the second assembly sinker; a second flange, which is arranged on the second surface, and the second flange is arranged around the first flange, and the second flange is protruded from the first surface to one side of the second surface.

[0009] In an embodiment of the present invention, a second fillet is provided on the second flange.

[0010] In one embodiment of the present invention, the second assembly sink comprises a first end close to the first assembly sink and a second end away from the first assembly sink, and a diameter of the first end is smaller than a diameter of the second end.

[0011] In one embodiment of the present invention, the edge of the cover body extends radially to form a clamping portion.

[0012] In one embodiment of the present invention, the bottom wall of the first assembly sink is staggered with the welding depth.

[0013] The utility model also provides a top cover assembly, comprising any one of the battery cover plates described above.

[0014] In one embodiment of the utility model, a protective component is further included, wherein the protective component is connected to the battery cover, a protective cavity is formed between the protective component and the battery cover, and the protective cavity is communicated with the accommodating hole; an air flow hole is opened on the protective component, the air flow hole passes through the protective component, and the air flow hole is communicated with the protective cavity.

[0015] The utility model also provides a battery, comprising any one of the top cover components described above.

[0016] The above technical solution of the utility model has the following advantages compared with the prior art:

[0017] The battery cover described in the utility model is provided with a first assembly sink, a receiving hole and a first flange on the cover body. By providing the first flange, the thickness of the cover body is increased, compensating for the thickness thinned by the provision of the assembly sink, and the structural strength of the cover body can be effectively strengthened. When welding and assembling the safety valve, since the structural strength of the cover body is increased, it is no longer easily deformed by factors such as welding temperature. On the one hand, the assembly of the cover body and the safety valve can be smoothly realized, thereby improving the overall production efficiency. On the other hand, the problem of deformation of the safety valve or even premature pressure relief due to deformation of the cover body is effectively avoided, thereby improving the yield rate, ensuring product quality, and ensuring the safety performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to the specific embodiments of the utility model in combination with the accompanying drawings, wherein:

[0019] Figure 1 This is one of the cross-sectional structural schematic diagrams of the battery cover in the preferred embodiment of the utility model;

[0020] Figure 2 This is the second schematic cross-sectional structure diagram of the battery cover in the preferred embodiment of the utility model;

[0021] Figure 3 This is the third schematic diagram of the cross-sectional structure of the battery cover in the preferred embodiment of the utility model;

[0022] Figure 4 This is a structural schematic diagram of the clamping portion in a preferred embodiment of the utility model;

[0023] Figure 5 This is the fourth schematic cross-sectional structure diagram of the battery cover in the preferred embodiment of the utility model;

[0024] Figure 6 This is the fifth schematic cross-sectional structure diagram of the battery cover in the preferred embodiment of the utility model;

[0025] Figure 7 This is a schematic diagram of the structure of the battery cover in the preferred embodiment of the utility model from a first perspective;

[0026] Figure 8 This is a schematic diagram of the structure of the battery cover from a second viewing angle in a preferred embodiment of the utility model;

[0027] Fig. 9 It is a schematic cross-sectional structural diagram of the top cover assembly in the preferred embodiment of the utility model.

[0028] Explanation of the reference numerals in the specification: 10. cover body; 101. first surface; 102. second surface; 11. first assembly sink; 12. accommodation hole; 13. first flange; 14. first fillet; 15. second assembly sink; 151. first end; 152. second end; 16. second flange; 17. second fillet; 18. snap-fit ​​portion; 19. mounting chamfer; 20. protective component; 21. protective cavity; 22. air flow hole. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0030] Reference Figure 1 As shown, the utility model discloses a battery cover, including a cover body 10, a first assembly sink 11, a receiving hole 12 and a first flange 13.

[0031] The cover body 10 is used to set corresponding components, such as a safety valve, a pole, a liquid injection hole, etc., and is connected to the battery housing. The cover body 10 includes a first surface 101 and a second surface 102 arranged opposite to each other along its thickness direction. The first assembly sink 11 is used to achieve a fixed connection with the welding portion of the safety valve. The first assembly sink 11 is arranged on the cover body 10, and the first assembly sink 11 is formed by being recessed from the first surface 101 to the second surface 102. At the same time, compared with directly assembling the safety valve on the receiving hole 12 without setting an assembly sink, the first assembly sink 11 can also facilitate the positioning of the safety valve during installation. The receiving hole 12 is arranged on the bottom wall of the first assembly sink 11, and the receiving hole 12 passes through the cover body 10 to the second surface 102. The through setting ensures that when the battery encounters a thermal runaway situation, the gas inside the battery can contact the safety valve through the receiving hole 12. When the gas pressure inside the battery reaches the bursting pressure of the safety valve, the safety valve opens to release the pressure and ensure the safety of the battery. In some embodiments, the welding part of the safety valve can also be bent and then assembled with the first assembly sinker 11. At this time, part of the safety valve located in the inner circle of the welding part will enter the receiving hole 12, which can play a further limiting role for the safety valve. The first flange 13 is arranged on the second surface 102, and the first flange 13 is arranged around the receiving hole 12. The first flange 13 is formed by protruding from the first surface 101 to the side of the second surface 102. Preferably, the molding of the first assembly sinker 11, the receiving hole 12 and the first flange 13 is realized based on the stamping process. By setting the first flange 13, the thickness of the cover body 10 is increased, which can effectively strengthen the structural strength of the cover body 10, make up for the thickness thinned by the opening of the first assembly sinker 11, and avoid deformation problems during welding. It should be noted that the shape and size of the specific cover body 10, the first assembly sinker 11, the receiving hole 12 and the first flange 13 can be set according to actual needs. Preferably, the cover body 10 is configured as a rectangular plate-shaped structure, and the first assembly sink 11 and the accommodating hole 12 are both configured as cylindrical structures.

[0032] The battery cover described in the utility model is provided with a first assembly sink 11, a receiving hole 12 and a first flange 13 on the cover body 10. By providing the first flange 13, the thickness of the cover body 10 is increased, compensating for the thickness thinned by the first assembly sink 11, and the structural strength of the cover body 10 can be effectively enhanced. When welding and assembling the safety valve, since the structural strength of the cover body 10 is increased, it is no longer easily deformed by factors such as welding temperature. On the one hand, the assembly of the cover body 10 and the safety valve can be smoothly realized, thereby improving the overall production efficiency. On the other hand, the problem of deformation of the safety valve or even premature pressure relief due to deformation of the cover body 10 is effectively avoided, thereby improving the yield rate, ensuring product quality, and ensuring the safety performance of the battery.

[0033] Reference Figure 2 As shown, in some embodiments of the battery cover of the utility model, the accommodating hole 12 and the first flange 13 are both provided with a first rounded corner 14. The provision of the first rounded corner 14 facilitates the forming of the material during the stamping process. Compared with stamping the corresponding position into a right angle, stamping it into a rounded corner is easier to form because the required material volume is reduced, and it can also reduce the generation of internal stress during the production process.

[0034] Reference Figure 3 , Figure 7 and Figure 8 As shown, the battery cover plate described in the utility model, in some embodiments, further includes a second assembly sink 15. In some cases, such as an external safety valve, it is necessary to set components such as a safety valve cap on the outside of the safety valve to prevent the safety valve from being damaged by external factors. At this time, the assembly of this type of components is achieved through the second assembly sink 15. Specifically, the second assembly sink 15 is arranged on the first surface 101, and the second assembly sink 15 is formed by being recessed from the first surface 101 to the second surface 102. The first assembly sink 11 is arranged on the bottom wall of the second assembly sink 15, and the diameter of the first assembly sink 11 is smaller than the diameter of the second assembly sink 15. In addition, the setting of the second assembly sink 15 also facilitates positioning during component installation. It should be noted that the connection method between the components such as the safety valve cap and the second assembly sink 15 can be selected according to actual needs, such as welding, bonding, etc. The second flange 16 is arranged on the second surface 102, and the second flange 16 is arranged around the first flange 13, and the second flange 16 is formed by protruding from the first surface 101 to one side of the second surface 102. Preferably, the molding of the second assembly sinker 15, the first assembly sinker 11, the accommodating hole 12, the first flange 13 and the second flange 16 is realized based on a stamping process. By setting the second flange 16, the thickness of the cover body 10 is increased, which can effectively strengthen the structural strength of the cover body 10, make up for the thickness thinned by the opening of the second assembly sinker 15, and avoid deformation problems during welding. It should be noted that the shape and size of the specific second assembly sinker 15 can be set according to actual needs. Preferably, the second assembly sinker 15 is set to an elliptical cylinder-shaped structure or an elliptical cone-shaped structure. In some other embodiments, the second assembly sinker 15 can also be set to a rectangular body-shaped structure or a rectangular cone-shaped structure.

[0035] Further, see Figure 3 As shown, in some embodiments of the battery cover of the utility model, a second rounded corner 17 is provided on the second flange 16. The second rounded corner 17 is provided to facilitate the forming of the material during the stamping process. Compared with stamping the corresponding position into a right angle, stamping it into a rounded corner is easier to form because the required material volume is reduced, and it can also reduce the generation of internal stress during the production process.

[0036] Further, see Figure 3 As shown, in some embodiments of the battery cover plate of the utility model, the second assembly sink 15 includes a first end 151 close to the first assembly sink 11 and a second end 152 away from the first assembly sink 11, and the diameter of the first end 151 is smaller than the diameter of the second end 152. By limiting the diameters of the two ends of the second assembly sink 15, the second assembly sink 15 forms a truncated cone structure, which can not only facilitate the displacement welding of the welding gun during the welding assembly process, but also have a certain gathering effect, so that the solder slides along the side wall of the second assembly sink 15 under the action of gravity, so as to achieve a firm connection between the welding component and the second assembly sink 15.

[0037] Reference Figure 4 As shown, in some embodiments of the battery cover of the utility model, the edge of the cover body 10 extends radially to form a clamping portion 18. By providing the clamping portion 18, the cover body 10 can be placed at the opening of the battery housing through the clamping portion 18 to prevent the cover body 10 from sinking into the battery housing.

[0038] Reference Figure 5 As shown, in some embodiments of the battery cover plate described in the utility model, the bottom wall of the first assembly sinker 11 is misaligned with the welding depth. During the assembly process of the battery cover plate and the battery shell, the fixed connection between the two is usually achieved by welding. Welding will produce a certain weld. Taking the welding top cover as an example, the weld produced by welding presents a structure that is wide at the top and narrow at the bottom. However, no matter whether the weld is wide or narrow, it will shrink due to heat and cause certain deformation, thereby affecting the quality of the product. To this end, by misaligning the bottom wall of the first assembly sinker 11 with the welding depth, it is avoided that welding has an adverse effect on the first assembly sinker 11 and the safety valve, and the safety performance of the battery is further guaranteed. Preferably, when a second assembly sinker 15 is provided, the depth of the second assembly sinker 15 is not less than one-third of the shell cover welding depth. The definition of the welding depth and how to obtain the welding depth are common knowledge of those skilled in the art and will not be repeated.

[0039] Reference Figure 5 and Figure 6 As shown, in some embodiments of the battery cover of the utility model, a mounting chamfer 19 is provided on the edge of the first surface 101 or the edge of the second surface 102. The provision of the mounting chamfer 19 facilitates easier assembly of the cover body 10 with the battery housing. It should be noted that the mounting chamfer 19 can be provided on the edge of the first surface 101 or the edge of the second surface 102 of the cover body 10 according to actual needs. For example, when assembling an external safety valve, the mounting chamfer 19 is provided on the edge of the second surface 102; when assembling a built-in safety valve, the mounting chamfer 19 is provided on the edge of the first surface 101.

[0040] The utility model discloses a top cover assembly, including the battery cover plate described in any one of the above embodiments. Since the top cover assembly of the utility model includes the battery cover plate described in the above embodiments, the top cover assembly also has all the advantages, which will not be described again.

[0041] Further, see Fig. 9 As shown, the top cover assembly described in the utility model, in some embodiments, further includes a protective component 20. Preferably, the protective component 20 is set as a lower plastic bracket. The protective component 20 is connected to the battery cover plate, and the connection method between the two can be set according to actual needs, such as clamping, welding, etc. A protective cavity 21 is formed between the protective component 20 and the battery cover plate, and the protective cavity 21 is connected to the receiving hole 12; an air flow hole 22 is opened on the protective component 20, and the air flow hole 22 runs through the protective component 20, and the air flow hole 22 is connected to the protective cavity 21. Through the setting of the protective component 20, on the one hand, when the battery encounters problems such as thermal runaway, the air flow hole 22 can ensure that the gas inside the battery can enter the protective cavity 21 and the receiving hole 12 in turn and contact with the safety valve, thereby opening the safety valve to achieve pressure relief. On the other hand, it can also form protection for the safety valve inside the battery housing, avoiding the inability to relieve pressure due to foreign matter blocking the receiving hole 12 when the battery is in thermal runaway, and can effectively ensure the safety performance of the battery.

[0042] The utility model discloses a battery, comprising the top cover assembly described in any one of the above embodiments. Since the battery of the utility model comprises the top cover assembly described in the above embodiments, the battery also has all the advantages, which will not be described again.

[0043] Working principle:

[0044] The battery cover is produced based on the stamping process. When assembling the safety valve, taking the external safety valve as an example, the safety valve is set in the first assembly sink 11, and the safety valve and the first assembly sink 11 are fixedly connected by laser welding. Then, the safety valve cap is set in the second assembly sink 15, and the safety valve cap and the second assembly sink 15 are fixedly connected by laser welding or bonding.

[0045] Due to the arrangement of the first assembly sink 11 and the second assembly sink 15, it is possible to facilitate the positioning and assembly of components such as the safety valve, thereby improving the overall production efficiency. Due to the arrangement of the first flange 13 and the second flange 16, the thickness thinned by the opening of the first assembly sink 11 and the second assembly sink 15 is compensated. Therefore, the structural strength of the cover plate is effectively improved, and it is no longer easily deformed by factors such as welding temperature. It can effectively improve the yield rate, ensure product quality, and ensure the safety performance of the battery.

[0046] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.

Claims

1. A battery cover, characterized in that: include: A cover plate body, the cover plate body comprising a first surface and a second surface arranged opposite to each other along a thickness direction of the cover plate body; A first assembly sink, which is disposed on the cover body and is recessed from the first surface toward one side of the second surface; An accommodating hole, the accommodating hole is arranged on the bottom wall of the first assembly sink, and the accommodating hole passes through the cover body to the second surface; The first flange is arranged on the second surface, the first flange is arranged around the receiving hole, and the first flange is formed by protruding from the first surface to one side of the second surface.

2. The battery cover according to claim 1, characterized in that: The accommodating hole and the first flange are both provided with a first rounded corner.

3. The battery cover according to claim 1, characterized in that: Also includes: A second assembly sink, the second assembly sink is arranged on the first surface, the second assembly sink is recessed from the first surface to one side of the second surface, the first assembly sink is arranged on the bottom wall of the second assembly sink, and the diameter of the first assembly sink is smaller than the diameter of the second assembly sink; The second flange is arranged on the second surface, the second flange is arranged around the first flange, and the second flange is formed by protruding from the first surface to one side of the second surface.

4. The battery cover according to claim 3, characterized in that: The second flange is provided with a second rounded corner.

5. The battery cover according to claim 3, characterized in that: The second assembly sink includes a first end close to the first assembly sink and a second end away from the first assembly sink, and a diameter of the first end is smaller than a diameter of the second end.

6. The battery cover according to claim 1, characterized in that: The edge of the cover plate body extends radially to form a clamping portion.

7. The battery cover according to claim 1, characterized in that: The bottom wall of the first assembly sink is staggered with the welding depth.

8. A top cover assembly, characterized in that: Comprising the battery cover as claimed in any one of claims 1 to 7.

9. The top cover assembly according to claim 8, characterized in that: Also includes: A protection component is connected to the battery cover, a protection cavity is formed between the protection component and the battery cover, and the protection cavity is communicated with the accommodating hole; an air flow hole is opened on the protection component, the air flow hole passes through the protection component, and the air flow hole is communicated with the protection cavity.

10. A battery, characterized in that: Comprising a top cover assembly as claimed in claim 8 or 9.

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