Battery cover plate and battery

Abstract

The present application discloses a battery cover plate and a battery. The battery cover plate comprises a substrate. The substrate is provided with a welding hole and a liquid injection hole; the surface of the substrate is provided with a first reinforcing portion located in the circumferential direction of the welding hole and a second reinforcing portion located in the circumferential direction of the liquid injection hole; the first reinforcing portion and the second reinforcing portion are connected to form an integral structure; both the first reinforcing portion and the second reinforcing portion protrude from the surface of the substrate; the bottom surface of the substrate is provided with a third reinforcing portion located in the circumferential direction of the welding hole; and the third reinforcing portion protrudes from the bottom surface of the substrate. The present application enhances the strength at the position of the welding hole and the position of the liquid injection hole, thereby ensuring that after installed in the welding hole, an explosion-proof valve maintains a stable opening pressure.

Description

Battery cover and battery

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202421687402.9, filed on July 16, 2024, entitled “Battery Cover and Battery”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to, but is not limited to, the field of battery technology, and in particular to a battery cover and a battery. Background Technology

[0004] Explosion-proof valves are basic safety pressure relief devices for lithium batteries. Traditionally, explosion-proof valves are assembled with cover plates by welding. Welding holes for installing explosion-proof valves are made in the cover plates of lithium batteries. Because the cover plates have welding holes and injection holes, the load-bearing area of ​​the cover plates is reduced. At the same time, stress concentration increases the edge stress of the welding holes, weakening the strength of the circumferential position of the welding holes and the position of the injection holes. This affects the opening pressure of the explosion-proof valve in the welding holes, causing the opening pressure of the explosion-proof valve to be unstable. Summary of the Invention

[0005] According to the first aspect of this application, a battery cover is provided, including a substrate. The substrate has welding holes and a liquid injection hole. A first reinforcing portion circumferentially located at the welding holes and a second reinforcing portion circumferentially located at the liquid injection hole are provided on the surface of the substrate. The first and second reinforcing portions are integrally connected and both protrude from the surface of the substrate. A third reinforcing portion circumferentially located at the welding holes and protruding from the bottom surface of the substrate is provided on the bottom surface of the substrate. The first, second, and third reinforcing portions reinforce the area between the welding holes and the liquid injection hole, ensuring the stability of the opening pressure of the explosion-proof valve within the welding holes.

[0006] In some embodiments of this application, the surfaces of the first reinforcing portion and the second reinforcing portion are both planar, and the surfaces of the first reinforcing portion and the second reinforcing portion are flush. The first reinforcing portion and the second reinforcing portion have an integral and flat surface, which improves the connection strength between the first reinforcing portion and the second reinforcing portion.

[0007] In some embodiments of this application, the outer peripheral sidewall of the first reinforcing part is perpendicular to the surface of the substrate.

[0008] In some embodiments of this application, the first reinforcing part and the second reinforcing part are connected to form a T-shaped structure. The T-shaped structure can effectively enhance the connection stability of the first reinforcing part and the second reinforcing part.

[0009] In some embodiments of this application, a groove is provided within the second reinforcing section, with the injection hole located at the bottom of the groove. When overflow occurs in the injection hole, the groove can temporarily store some of the overflowing liquid, preventing contamination of the welding hole.

[0010] In some embodiments of this application, the third reinforcing portion and the first reinforcing portion are respectively disposed on the surface and bottom surface of the substrate, and the third reinforcing portion is disposed in a closed loop along the circumference of the welding hole. The third reinforcing portion and the first reinforcing portion are respectively located at corresponding positions on the upper and lower surfaces of the substrate, thereby relatively reinforcing the circumferential strength of the welding hole.

[0011] In some embodiments of this application, the outer peripheral sidewall of the third reinforcing part is perpendicular to the bottom surface of the substrate, and a welding groove is provided on the inner periphery of the third reinforcing part. The welding groove communicates with the welding hole and is used for welding and positioning the explosion-proof valve. The welding groove on the inner periphery of the third reinforcing part is used for installing the explosion-proof valve, so that the explosion-proof valve can be accurately installed into the third reinforcing part.

[0012] In some embodiments of this application, a fourth reinforcing portion is provided on the bottom surface of the substrate, circumferentially to the injection hole. The fourth reinforcing portion and the second reinforcing portion are respectively provided on the surface and bottom surface of the substrate. The fourth reinforcing portion is connected to the third reinforcing portion to form an integral unit, and the fourth reinforcing portion protrudes from the bottom surface of the substrate. By providing the first and second reinforcing portions on the surface of the substrate and the third and fourth reinforcing portions on the bottom surface of the substrate, the solder holes and injection holes are structurally reinforced on both sides of the substrate, thereby improving the overall strength of the substrate.

[0013] In some embodiments of this application, the bottom surfaces of both the third and fourth reinforcing parts are planar, and are flush with each other. The third and fourth reinforcing parts have an integral and flat bottom surface, improving the connection strength between them.

[0014] According to a second aspect of this application, a battery is provided, including the aforementioned battery cover.

[0015] Details of one or more embodiments of this application are set forth in the following drawings and description. Other features and advantages of this application will become apparent from the specification, drawings, and claims. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 is a top view of a battery cover provided in one or more embodiments of this application;

[0018] Figure 2 is a surface schematic diagram of a battery cover provided in one or more embodiments of this application;

[0019] Figure 3 is a schematic diagram of the bottom surface of a battery cover provided according to one or more embodiments of this application;

[0020] Figure 4 is a partial cross-sectional view of Figure 3;

[0021] Figure 5 is a second schematic diagram of the bottom surface of the battery cover provided in this application according to one or more embodiments;

[0022] Figure 6 is a partial cross-sectional schematic diagram of Figure 5.

[0023] Reference numerals: 1. Substrate; 11. Solder hole; 12. Liquid injection hole; 2. First reinforcing part; 3. Second reinforcing part; 31. Hole groove; 4. Third reinforcing part; 41. Solder groove; 5. Fourth reinforcing part. Detailed Implementation

[0024] To make the technical solutions and advantages of the embodiments of this application clearer, the exemplary embodiments of this application will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not an exhaustive list of all embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0025] Example 1

[0026] This embodiment provides a battery cover plate with a welding hole 11 and an injection hole 12. The welding hole 11 is used to install an explosion-proof valve (not shown in the figure), and the injection hole 12 is a through hole for injecting electrolyte into the battery. Because of the opening in the battery cover plate, the strength at the welding hole 11 and the injection hole 12 is weakened, thus affecting the stability of the opening pressure of the explosion-proof valve. This embodiment improves the overall strength of the battery cover plate by structurally reinforcing the welding hole 11 and the injection hole 12.

[0027] Figure 1 is a top view of the battery cover provided in an embodiment of this application; Figure 2 is a surface view of the battery cover provided in an embodiment of this application; Figure 3 is one of the bottom view views of the battery cover provided in an embodiment of this application; Figure 4 is a partial cross-sectional view of Figure 3.

[0028] As shown in Figures 1-4, this embodiment provides a battery cover plate, including a substrate 1. The substrate 1 has a welding hole 11 and an injection hole 12. The surface of the substrate 1 is provided with a first reinforcing part 2 located around the welding hole 11 and a second reinforcing part 3 located around the injection hole 12. The first reinforcing part 2 and the second reinforcing part 3 are connected to form an integral part. Both the first reinforcing part 2 and the second reinforcing part 3 protrude from the surface of the substrate 1. The bottom surface of the substrate 1 is provided with a third reinforcing part 4 located around the welding hole 11. The third reinforcing part 4 protrudes from the bottom surface of the substrate 1.

[0029] The substrate 1 can be a rectangular plate structure, an elliptical plate structure, or a square plate structure. In this embodiment, the substrate 1 is a rectangular plate structure. The long side of the substrate 1 is the transverse direction, i.e., the X direction, and the short side of the substrate 1 is the longitudinal direction, i.e., the Y direction.

[0030] In one embodiment, the center of the welding hole 11 and the center of the liquid injection hole 12 are both located on the center line of the substrate 1 along the transverse direction of the substrate 1.

[0031] The welding hole 11 can be a circular hole, an elliptical hole, or an olive-shaped hole. In this embodiment, the welding hole 11 is an elliptical hole, and the welding holes 11 are symmetrically arranged on both sides of the center line of the substrate 1.

[0032] In this embodiment, a first reinforcing part 2 located around the welding hole 11 and a second reinforcing part 3 located around the injection hole 12 are provided on the surface of the substrate 1. The first reinforcing part 2 and the second reinforcing part 3 are connected to form an integral structure, forming an integral reinforcing structure at the positions of the welding hole 11 and the injection hole 12, thereby improving the strength of the positions of the welding hole 11 and the injection hole 12. A third reinforcing part 4 located around the welding hole 11 is provided on the bottom surface of the substrate 1. The third reinforcing part 4 reinforces the position of the welding hole 11 on the bottom surface of the substrate 1. The first reinforcing part 2, the second reinforcing part 3, and the third reinforcing part 4 together reinforce the position between the welding hole 11 and the injection hole 12, ensuring the stability of the opening pressure of the explosion-proof valve in the welding hole 11.

[0033] Example 2

[0034] This embodiment optimizes the battery cover based on the above embodiments, and in particular provides a specific implementation of the first reinforcing part and the second reinforcing part:

[0035] The surface of the substrate 1 is provided with a first reinforcing part 2 located around the welding hole 11 and a second reinforcing part 3 located around the liquid injection hole 12. The first reinforcing part 2 and the second reinforcing part 3 are connected to form an integral part, and both the first reinforcing part 2 and the second reinforcing part 3 protrude from the surface of the substrate 1.

[0036] Figure 2 is a surface schematic diagram of the battery cover provided in an embodiment of this application; Figure 3 is one of the bottom schematic diagrams of the battery cover provided in an embodiment of this application; Figure 4 is a partial cross-sectional schematic diagram of Figure 3.

[0037] As shown in Figures 2-4, the surfaces of the first reinforcing part 2 and the second reinforcing part 3 may have a height difference. In this embodiment, both the surfaces of the first reinforcing part 2 and the second reinforcing part 3 are planar; the surfaces of the first reinforcing part 2 and the second reinforcing part 3 are flush. The first reinforcing part 2 and the second reinforcing part 3 have an integral and flat surface, which improves the connection strength between the first reinforcing part 2 and the second reinforcing part 3.

[0038] In one embodiment, the first reinforcing part 2 is provided along the circumferential edge of the welding hole 11, the outer peripheral sidewall of the first reinforcing part 2 is perpendicular to the surface of the substrate 1, and the sidewall of the first reinforcing part 2 and the surface of the substrate 1 may be provided with a transition part (not shown in the figure) that is connected, the transition part may have an arc-shaped surface, thereby improving the connection strength between the first reinforcing part 2 and the substrate 1.

[0039] The first reinforcing part 2 and the second reinforcing part 3 can be connected to form a structure with a circular, rectangular, elliptical, or irregular cross-section. In this embodiment, the second reinforcing part 3 extends to the first reinforcing part 2 near the center of the welding hole 11. The first reinforcing part 2 and the second reinforcing part 3 are connected to form a roughly T-shaped cross-section, ensuring the connection stability of the first reinforcing part 2 and the second reinforcing part 3.

[0040] The second reinforcing part 3 is provided with a groove 31, and the injection hole 12 is located at the bottom of the groove 31. The groove 31 increases the depth of the injection hole 12. When there is overflow in the injection hole 12, the groove 31 can temporarily store some of the overflow liquid to avoid contamination of the welding hole 11.

[0041] The first reinforcing part 2 and the second reinforcing part 3 can be connected by integral molding or welding, and the first reinforcing part 2 and the second reinforcing part 3 can be connected to the substrate 1 by integral molding or welding. Specifically, the first reinforcing part 2 and the second reinforcing part 3 can be integrally molded by stamping.

[0042] Example 3

[0043] This embodiment optimizes the battery cover based on the above embodiment, and in particular provides a specific implementation of the third reinforcing part:

[0044] The bottom surface of the substrate 1 is provided with a third reinforcing part 4 located around the welding hole 11, and the third reinforcing part 4 protrudes from the bottom surface of the substrate 1.

[0045] Figure 3 is one of the bottom view diagrams of the battery cover provided in the embodiment of this application; Figure 4 is a partial cross-sectional view of Figure 3; Figure 5 is another bottom view diagram of the battery cover provided in the embodiment of this application.

[0046] As shown in Figures 3-5, the third reinforcing part 4 and the first reinforcing part 2 are respectively provided on the surface and bottom surface of the substrate 1. The trajectory of the third reinforcing part 4 along the circumferential direction of the welding hole 11 is approximately the same as that of the first reinforcing part 2 along the circumferential direction of the welding hole 11. The third reinforcing part 4 can be arranged in a closed loop along the circumferential direction of the welding hole 11. The third reinforcing part 4 can effectively enhance the strength of the bottom surface of the substrate 1 located in the circumferential direction of the welding hole 11. The combination of the first reinforcing part 2, the second reinforcing part 3 and the third reinforcing part 4 can ensure the stability of the opening pressure of the explosion-proof valve assembled in the welding hole 11.

[0047] In one embodiment, the outer peripheral sidewall of the third reinforcing part 4 is perpendicular to the bottom surface of the substrate 1. The bottom surface of the third reinforcing part 4 is a plane. A welding groove 41 is provided on the inner periphery of the third reinforcing part 4. The welding groove 41 is connected to the welding hole 11. The welding groove 41 is used for welding the positioning explosion-proof valve.

[0048] In another embodiment, a fourth reinforcing part 5 located around the injection hole 12 may be provided on the bottom surface of the substrate 1. The fourth reinforcing part 5 is connected to the third reinforcing part 4 to form an integral part, and the fourth reinforcing part 5 protrudes from the bottom surface of the substrate 1.

[0049] Example 4

[0050] This embodiment optimizes the battery cover based on the above embodiment, and in particular provides a specific implementation of the fourth reinforcing part:

[0051] Figure 5 is a second schematic diagram of the bottom surface of the battery cover provided in the embodiment of this application; Figure 6 is a partial cross-sectional schematic diagram of Figure 5.

[0052] As shown in Figures 5 and 6, the third reinforcing part 4 and the fourth reinforcing part 5 are connected to form an integral structure, and the first reinforcing part 2 and the second reinforcing part 3 are connected to form an integral structure. The two integral structures can be the same or different.

[0053] In one embodiment, the fourth reinforcing part 5 and the second reinforcing part 3 are respectively disposed on the surface and bottom surface of the substrate 1. The bottom surface of the third reinforcing part 4 and the bottom surface of the fourth reinforcing part 5 may have a height difference. In this embodiment, the bottom surface of the third reinforcing part 4 and the bottom surface of the fourth reinforcing part 5 are both planar; the bottom surface of the third reinforcing part 4 and the bottom surface of the fourth reinforcing part 5 are flush. The third reinforcing part 4 and the fourth reinforcing part 5 have an integral and flat bottom surface, which improves the connection strength between the third reinforcing part 4 and the fourth reinforcing part 5.

[0054] The third reinforcing part 4 and the fourth reinforcing part 5 can be connected to form a structure with a circular, rectangular, elliptical, or irregular cross-section. In this embodiment, the fourth reinforcing part 5 extends to the third reinforcing part 4 near the center of the welding hole 11. The third reinforcing part 4 and the fourth reinforcing part 5 are connected to form a roughly T-shaped cross-section, ensuring the connection stability of the third reinforcing part 4 and the fourth reinforcing part 5.

[0055] The third reinforcing part 4 and the fourth reinforcing part 5 can be connected by integral molding or welding. The third reinforcing part 4 and the fourth reinforcing part 5 can be connected to the substrate 1 by integral molding or welding. Specifically, the third reinforcing part 4 and the fourth reinforcing part 5 can be integrally molded by stamping.

[0056] The substrate 1 has a first reinforcing part 2 and a second reinforcing part 3 on its surface, and a third reinforcing part 4 and a fourth reinforcing part 5 on its bottom surface. By structurally reinforcing the welding hole 11 and the liquid injection hole 12 on both sides of the substrate 1, the overall strength of the substrate 1 can be improved, ensuring the stability of the explosion-proof valve assembled in the welding hole 11 and effectively controlling the stability of the opening pressure of the explosion-proof valve.

[0057] Example 5

[0058] This embodiment provides a battery, including the battery cover plate from the above embodiments. The beneficial effects of the battery cover plate in this embodiment are not elaborated here.

[0059] In the description of this application, it should be understood that the terms "centerline", "longitudinal", "lateral", "surface", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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 application.

[0060] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0061] In this application, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0062] Although alternative embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make further changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the alternative embodiments as well as all changes and modifications falling within the scope of this application.

[0063] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1.A battery cover plate, comprising a substrate, a welding hole and a liquid injection hole being formed on the substrate, a first reinforcing portion being arranged on a periphery of the welding hole and a second reinforcing portion being arranged on a periphery of the liquid injection hole, the first reinforcing portion and the second reinforcing portion being connected to form an integral body, the first reinforcing portion and the second reinforcing portion being protruded from a surface of the substrate, a third reinforcing portion being arranged on a bottom surface of the substrate and being protruded from the bottom surface of the substrate. 2.The battery cover plate according to claim 1, wherein the surface of the first reinforcing portion and the surface of the second reinforcing portion are both flat, and the surface of the first reinforcing portion is flush with the surface of the second reinforcing portion. 3.The battery cover plate according to claim 1, wherein an outer peripheral sidewall of the first reinforcing portion is perpendicular to the surface of the substrate. 4.The battery cover plate according to claim 1, wherein the first reinforcing portion and the second reinforcing portion form a T-shaped structure. 5.The battery cover plate according to claim 1, wherein a hole groove is arranged in the second reinforcing portion, and the liquid injection hole is arranged at a groove bottom of the hole groove. 6.The battery cover plate according to claim 1, wherein the third reinforcing portion is arranged on the surface of the substrate and the bottom surface of the substrate, respectively, and the third reinforcing portion is arranged in a closed loop along the periphery of the welding hole. 7.The battery cover plate according to claim 1, wherein an outer peripheral sidewall of the third reinforcing portion is perpendicular to the bottom surface of the substrate, and a welding groove is arranged on an inner periphery of the third reinforcing portion, the welding groove being communicated with the welding hole and being used for welding a position explosion-proof valve. 8.The battery cover plate according to claim 1, wherein a fourth reinforcing portion is arranged on the bottom surface of the substrate and being arranged on the periphery of the liquid injection hole, the fourth reinforcing portion and the second reinforcing portion being arranged on the surface of the substrate and the bottom surface of the substrate, respectively, the fourth reinforcing portion and the third reinforcing portion being connected to form an integral body, and the fourth reinforcing portion being protruded from the bottom surface of the substrate. 9.The battery cover plate according to claim 8, wherein the bottom surface of the third reinforcing portion and the bottom surface of the fourth reinforcing portion are both flat, and the bottom surface of the third reinforcing portion is flush with the bottom surface of the fourth reinforcing portion. 10.A battery, comprising the battery cover plate according to any one of claims 1 to 9.

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