Battery cover plate and battery

Abstract

The utility model 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 part located in the circumferential direction of the welding hole and a second reinforcing part located in the circumferential direction of the liquid injection hole, the first reinforcing part and the second reinforcing part are connected into a whole, the first reinforcing part and the second reinforcing part both protrude out of the surface of the base plate, the bottom face of the base plate is provided with a third reinforcing part located in the circumferential direction of the welding hole, and the third reinforcing part protrudes out of the bottom face of the base plate. According to the anti-explosion valve, the strength of the welding hole position and the liquid injection hole position is improved, and it is guaranteed that the anti-explosion valve has stable opening pressure after the anti-explosion valve is installed in the welding hole.

Description

Technical Field

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

[0002] The explosion-proof valve is a basic safety pressure relief device for lithium batteries. The traditional way of assembling the explosion-proof valve and the cover plate is welding. A welding hole for installing the explosion-proof valve is opened on the cover plate of the lithium battery. Since the cover plate is provided with the welding hole and the liquid injection hole, the bearing area of the cover plate is reduced, and at the same time, stress concentration makes the stress at the edge of the welding hole increase, and the strength at the circumferential position of the welding hole and the position of the liquid injection hole is weakened, thereby affecting the opening pressure of the explosion-proof valve in the welding hole and causing the problem of unstable opening pressure of the explosion-proof valve. Summary of the Utility Model

[0003] The purpose of the utility model is to solve the above technical problems, and provide a battery cover plate and a battery, so as to improve the strength of the position of the welding hole and the liquid injection hole, and ensure that the explosion-proof valve has a stable opening pressure after being installed in the welding hole. To achieve the above purpose, the technical solution of the utility model is as follows:

[0004] The battery cover plate includes a substrate. A welding hole and a liquid injection hole are opened on the substrate. 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 body. The first reinforcing portion and the second reinforcing portion both 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. The third reinforcing portion protrudes from the bottom surface of the substrate.

[0005] Overall, the first reinforcing portion, the second reinforcing portion, and the third reinforcing portion strengthen the position between the welding hole and the liquid injection hole, and ensure the stability of the opening pressure of the explosion-proof valve in the welding hole.

[0006] Specifically, the surfaces of the first reinforcing portion and the second reinforcing portion are both flat surfaces, and the surfaces of the first reinforcing portion and the second reinforcing portion are flush.

[0007] 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.

[0008] Specifically, the side wall of the first reinforcing portion is relatively perpendicular to the surface of the substrate.

[0009] Specifically, the first reinforcing portion and the second reinforcing portion are connected to form a T-shaped structure.

[0010] The T-shaped structure can effectively enhance the connection stability between the first reinforcing portion and the second reinforcing portion.

[0011] Specifically, a hole groove is provided in the second strengthening portion, and the liquid injection hole is located at the bottom of the hole groove.

[0012] When overflow occurs in the liquid injection hole, the hole groove can temporarily store part of the overflow liquid, avoiding contamination of the position of the welding hole.

[0013] Specifically, the third strengthening portion and the first strengthening portion are correspondingly arranged on the surface of the substrate and the bottom surface of the substrate respectively, and the third strengthening portion is arranged in a closed loop along the circumferential direction of the welding hole.

[0014] The third strengthening portion and the first strengthening portion are respectively located at the corresponding positions on the upper and lower surfaces of the substrate, relatively strengthening the circumferential strength of the welding hole.

[0015] Specifically, the outer peripheral side wall of the third strengthening portion is relatively perpendicular to the substrate, a welding groove is provided on the inner circumference of the third strengthening portion, the welding groove is communicated with the welding hole, and the welding groove is used for welding and positioning the explosion-proof valve.

[0016] A welding groove for installing the explosion-proof valve is provided on the inner circumference of the third strengthening portion, so that the explosion-proof valve can be accurately installed into the third strengthening portion.

[0017] Specifically, a fourth strengthening portion is provided on the bottom surface of the substrate at the circumferential direction of the liquid injection hole, the fourth strengthening portion and the second strengthening portion are correspondingly arranged on the surface of the substrate and the bottom surface of the substrate respectively, the fourth strengthening portion is connected with the third strengthening portion to form a whole, and the fourth strengthening portion protrudes from the bottom surface of the substrate.

[0018] The first strengthening portion and the second strengthening portion are provided on the surface of the substrate, and the third strengthening portion and the fourth strengthening portion are provided on the bottom surface of the substrate, so as to strengthen the structures of the welding hole and the liquid injection hole on both sides of the substrate respectively, and further improve the strength of the whole substrate.

[0019] Specifically, the bottom surface of the third strengthening portion and the bottom surface of the fourth strengthening portion are both flat surfaces, and the bottom surface of the third strengthening portion is flush with the bottom surface of the fourth strengthening portion.

[0020] The third strengthening portion and the fourth strengthening portion have an integral and flat bottom surface, improving the connection strength between the third strengthening portion and the fourth strengthening portion.

[0021] A battery, including the battery cover plate described above.

[0022] Compared with the prior art, the beneficial effects of the battery cover plate and the battery of the present utility model are mainly reflected in:

[0023] A first reinforcing portion located circumferentially around the welding hole and a second reinforcing portion located circumferentially around the liquid injection hole are provided on the surface of the substrate. The first reinforcing portion and the second reinforcing portion are connected to form an integral body, and a reinforcing structure is formed integrally at the positions of the welding hole and the liquid injection hole, improving the strength of the positions of the welding hole and the liquid injection hole; a third reinforcing portion located circumferentially around the welding hole is provided on the bottom surface of the substrate, and the third reinforcing portion strengthens the position of the welding hole on the bottom surface of the substrate. Overall, the first reinforcing portion, the second reinforcing portion, and the third reinforcing portion strengthen the position between the welding hole and the liquid injection hole, ensuring the stability of the opening pressure of the explosion-proof valve in the welding hole. Description of the Drawings

[0024] Figure 1 It is a top view schematic diagram of the battery cover plate provided by the embodiment of the present application;

[0025] Figure 2 It is a front view schematic diagram of the battery cover plate provided by the embodiment of the present application;

[0026] Figure 3 It is one of the back view schematic diagrams of the battery cover plate provided by the embodiment of the present application;

[0027] Figure 4 It is Figure 3 a partial cross-sectional schematic diagram of;

[0028] Figure 5 It is the second back view schematic diagram of the battery cover plate provided by the embodiment of the present application;

[0029] Figure 6 It is Figure 5 a partial cross-sectional schematic diagram of.

[0030] Reference Numerals:

[0031] Substrate 1, Welding Hole 11, Liquid Injection Hole 12;

[0032] First Reinforcing Portion 2;

[0033] Second Reinforcing Portion 3, Hole Groove 31;

[0034] Third Reinforcing Portion 4, Welding Groove 41;

[0035] Fourth Reinforcing Portion 5. Detailed Description of the Embodiment

[0036] In order to make the technical solutions and advantages in the embodiments of the present application clearer, the following further describes the exemplary embodiments of the present application in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than an exhaustive list of all embodiments. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0037] Embodiment 1

[0038] This embodiment provides a battery cover plate, on which a welding hole 11 and a liquid injection hole 12 are provided. The welding hole 11 is used to install an explosion-proof valve, and the liquid injection hole 12 is a through hole for injecting electrolyte into the interior of the battery. Since there are holes in the battery cover plate, the strength at the positions of the welding hole 11 and the liquid injection hole 12 is weakened, thereby affecting the stability of the opening pressure of the explosion-proof valve. In this embodiment, the structures at the positions of the welding hole 11 and the liquid injection hole 12 are strengthened to improve the strength of the overall battery cover plate.

[0039] Figure 1 It is a top view schematic diagram of the battery cover plate provided by the embodiment of the present application; Figure 2 It is a front view schematic diagram of the battery cover plate provided by the embodiment of the present application; Figure 3 It is one of the back view schematic diagrams of the battery cover plate provided by the embodiment of the present application; Figure 4 is Figure 3 partial cross-sectional schematic diagram of.

[0040] As Figures 1-4 shown, this embodiment provides a battery cover plate, including a substrate 1, on which a welding hole 11 and a liquid injection hole 12 are provided. A first strengthening portion 2 located in the circumferential direction of the welding hole 11 and a second strengthening portion 3 located in the circumferential direction of the liquid injection hole 12 are provided on the surface of the substrate 1. The first strengthening portion 2 and the second strengthening portion 3 are connected to form an integral body. Both the first strengthening portion 2 and the second strengthening portion 3 protrude from the surface of the substrate 1. A third strengthening portion 4 located in the circumferential direction of the welding hole 11 is provided on the bottom surface of the substrate 1, and the third strengthening portion 4 protrudes from the bottom surface of the substrate 1.

[0041] The substrate 1 can be a rectangular plate structure, an oval plate structure or a square plate structure. In this embodiment, the substrate 1 is a rectangular plate structure. The long side direction of the substrate 1 is the horizontal direction, that is, the X direction, and the short side direction of the substrate 1 is the longitudinal direction, that is, the Y direction.

[0042] Among them, along the center line in the horizontal direction of the substrate 1, the centers of both the welding hole 11 and the liquid injection hole 12 are located on the center line of the substrate 1.

[0043] The welding hole 11 can be a circular hole, an oval hole or an olive-shaped hole. In this embodiment, the welding hole 11 is an oval hole, and the welding hole 11 is symmetrically arranged on both sides of the center line of the substrate 1.

[0044] In this embodiment, a first reinforcing portion 2 is provided on the surface of the substrate 1 along the circumference of the welding hole 11, and a second reinforcing portion 3 is provided along the circumference of the liquid injection hole 12. The first reinforcing portion 2 and the second reinforcing portion 3 are connected to form an integral body, forming an integral reinforcing structure at the positions of the welding hole 11 and the liquid injection hole 12, thereby improving the strength at the positions of the welding hole 11 and the liquid injection hole 12. A third reinforcing portion 4 is provided on the bottom surface of the substrate 1 along the circumference of the welding hole 11, and the third reinforcing portion 4 reinforces the position of the welding hole 11 on the bottom surface of the substrate 1. Overall, the first reinforcing portion 2, the second reinforcing portion 3, and the third reinforcing portion 4 reinforce the position between the welding hole 11 and the liquid injection hole 12, ensuring the stability of the opening pressure of the explosion-proof valve in the welding hole 11.

[0045] Embodiment Two

[0046] Based on the above embodiment, this embodiment optimizes the battery cover plate, especially providing a specific implementation manner for the first reinforcing portion and the second reinforcing portion:

[0047] On the surface of the above-mentioned substrate 1, a first reinforcing portion 2 is provided along the circumference of the welding hole 11, and a second reinforcing portion 3 is provided along the circumference of the liquid injection hole 12. The first reinforcing portion 2 and the second reinforcing portion 3 are connected to form an integral body, and both the first reinforcing portion 2 and the second reinforcing portion 3 protrude from the surface of the substrate 1.

[0048] Figure 2 It is a front view of the battery cover plate provided by the embodiment of the present application; Figure 3 It is one of the back views of the battery cover plate provided by the embodiment of the present application; Figure 4 is Figure 3 partial cross-sectional view of.

[0049] As Figures 2-4 shown, there may be a height difference between the surface of the first reinforcing portion 2 and the surface of the second reinforcing portion 3. In this embodiment, both the surface of the first reinforcing portion 2 and the surface of the second reinforcing portion 3 are flat surfaces; the surface of the first reinforcing portion 2 is flush with the surface of the second reinforcing portion 3. The first reinforcing portion 2 and the second reinforcing portion 3 have an integral and flat surface, enhancing the connection strength between the first reinforcing portion 2 and the second reinforcing portion 3.

[0050] The first reinforcing portion 2 is arranged along the circumferential edge of the welding hole 11. The side wall of the first reinforcing portion 2 is relatively perpendicular to the surface of the substrate 1. A connecting transition portion (not shown in the figure) may be provided between the side wall of the first reinforcing portion 2 and the surface of the substrate 1. The transition portion may have an arc surface, further improving the connection strength between the first reinforcing portion 2 and the substrate 1.

[0051] The first reinforcing part 2 and the second reinforcing part 3 are connected to form a structure with a circular cross-section, a rectangular cross-section, an elliptical cross-section or an 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, and the first reinforcing part 2 and the second reinforcing part 3 are connected to form a substantially T-shaped cross-section structure, ensuring the connection stability between the first reinforcing part 2 and the second reinforcing part 3.

[0052] A hole groove 31 is provided in the second reinforcing part 3, and the liquid injection hole 12 is located at the bottom of the hole groove 31. The hole groove 31 increases the depth of the liquid injection hole 12. When overflow occurs in the liquid injection hole 12, the hole groove 31 can temporarily store part of the overflow liquid to avoid contaminating the position of the welding hole 11.

[0053] The first reinforcing part 2 and the second reinforcing part 3 can be connected by an integral molding method or a welding method. The first reinforcing part 2 and the second reinforcing part 3 can be respectively connected to the substrate 1 by an integral molding method or a welding method. The first reinforcing part 2 and the second reinforcing part 3 can be integrally formed by stamping.

[0054] Embodiment Three

[0055] Based on the above embodiment, this embodiment optimizes the battery cover plate, especially provides a specific implementation manner of a third reinforcing part:

[0056] A third reinforcing part 4 is provided on the bottom surface of the substrate 1 and is circumferentially located around the welding hole 11. The third reinforcing part 4 protrudes from the bottom surface of the substrate 1.

[0057] Figure 3 One of the back views of the battery cover plate provided by the embodiment of the present application; Figure 4 is Figure 3 a partial cross-sectional view; Figure 5 Another back view of the battery cover plate provided by the embodiment of the present application.

[0058] As Figures 3-5 shown, the third reinforcing part 4 and the first reinforcing part 2 are correspondingly arranged on the surface and the bottom surface of the substrate 1 respectively. The trajectory of the third reinforcing part 4 arranged along the circumference of the welding hole 11 is substantially the same as the trajectory of the first reinforcing part 2 arranged along the circumference of the welding hole 11. The third reinforcing part 4 can be arranged in a closed loop along the circumference of the welding hole 11. The third reinforcing part 4 can effectively enhance the strength of the position on the bottom surface of the substrate 1 circumferentially located around 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 when the explosion-proof valve is assembled in the welding hole 11.

[0059] The outer peripheral side wall of the third reinforcing part 4 is perpendicular to 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 communicated with the welding hole 11. The welding groove 41 is used for welding and positioning the explosion-proof valve.

[0060] In another embodiment, a fourth reinforcing part 5 circumferentially located around the liquid injection hole 12 may further be provided on the bottom surface of the substrate 1. The fourth reinforcing part 5 is integrally connected to the third reinforcing part 4 and protrudes from the bottom surface of the substrate 1.

[0061] Embodiment 4

[0062] This embodiment optimizes the battery cover based on the above embodiments, especially providing a specific implementation manner of the fourth reinforcing part:

[0063] Figure 5 This is the second schematic view of the back surface of the battery cover provided by the embodiment of the present application; Figure 6 It is Figure 5 a partial cross-sectional schematic view.

[0064] As Figure 5 and Figure 6 shown, the third reinforcing part 4 and the fourth reinforcing part 5 are integrally connected to form an integral structure. The first reinforcing part 2 and the second reinforcing part 3 are integrally connected to form an integral structure. The above two integral structures may be the same or different.

[0065] The fourth reinforcing part 5 and the second reinforcing part 3 are correspondingly arranged on the surface and the bottom surface of the substrate 1 respectively. There may be a height difference between the bottom surface of the third reinforcing part 4 and the bottom surface of the fourth reinforcing part 5. In this embodiment, the bottom surfaces of both the third reinforcing part 4 and the fourth reinforcing part 5 are planes; the bottom surfaces of the third reinforcing part 4 and 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, improving the connection strength between the third reinforcing part 4 and the fourth reinforcing part 5.

[0066] The connection between the third reinforcing part 4 and the fourth reinforcing part 5 may form a cross-sectional structure of a circular shape, a rectangular shape, an oval shape or an irregular shape. In this embodiment, the fourth reinforcing part 5 extends to the third reinforcing part 4 near the center of the welding hole 11. The connection between the third reinforcing part 4 and the fourth reinforcing part 5 forms a substantially T-shaped cross-sectional structure, ensuring the connection stability between the third reinforcing part 4 and the fourth reinforcing part 5.

[0067] The third reinforcing part 4 and the fourth reinforcing part 5 may be connected by an integral molding method or a welding method. The third reinforcing part 4 and the fourth reinforcing part 5 may be respectively connected to the substrate 1 by an integral molding method or a welding method. The third reinforcing part 4 and the fourth reinforcing part 5 may be integrally formed by stamping.

[0068] On the surface of the substrate 1, a first strengthening portion 2 and a second strengthening portion 3 are provided. On the bottom surface of the substrate 1, a third strengthening portion 4 and a fourth strengthening portion 5 are provided. The welding holes 11 and the liquid injection holes 12 are structurally strengthened on both sides of the substrate 1 respectively, which can further improve the strength of the overall substrate 1, ensure the stability of the explosion-proof valve assembled in the welding holes 11, and effectively control the stability of the opening pressure of the explosion-proof valve.

[0069] Embodiment 5

[0070] This embodiment provides a battery, including the battery cover plate in the above embodiment.

[0071] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0072] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0073] In the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0074] Although the preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications once they know the basic creative concepts. Therefore, the appended claims are intended to be construed as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0075] 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. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application is also intended to include these modifications and variations.

Claims

1. A battery cover, comprising a substrate, wherein the substrate is provided with a welding hole and a liquid injection hole, characterized in that: The surface of the substrate is provided with a first reinforcement portion located in the circumference of the welding hole and a second reinforcement portion located in the circumference of the injection hole, the first reinforcement portion is connected to the second reinforcement portion to form a whole, the first reinforcement portion and the second reinforcement portion both protrude from the surface of the substrate, and the bottom surface of the substrate is provided with a third reinforcement portion located in the circumference of the welding hole, and the third reinforcement portion protrudes from the bottom surface of the substrate.

2. The battery cover according to claim 1, characterized in that: The surface of the first reinforcement portion and the surface of the second reinforcement portion are both planes, and the surface of the first reinforcement portion is flush with the surface of the second reinforcement portion.

3. The battery cover according to claim 1, characterized in that: The side wall of the first reinforcing portion is relatively perpendicular to the surface of the substrate.

4. The battery cover according to claim 1, characterized in that: The first reinforcement portion and the second reinforcement portion are connected to form a T-shaped structure.

5. The battery cover according to claim 1, characterized in that: A hole groove is arranged in the second reinforcement part, and the injection hole is located at the bottom of the hole groove.

6. The battery cover according to claim 1, characterized in that: The third reinforcement portion and the first reinforcement portion are respectively arranged correspondingly on the surface of the substrate and the bottom surface of the substrate, and the third reinforcement portion is arranged in a closed loop along the circumference of the welding hole.

7. The battery cover according to claim 1, characterized in that: The outer peripheral side wall of the third reinforcement part is relatively perpendicular to the base plate, and the inner periphery of the third reinforcement part is provided with a welding groove, which is communicated with the welding hole and is used for welding and positioning the explosion-proof valve.

8. The battery cover according to claim 1, characterized in that: The bottom surface of the substrate is provided with a fourth reinforcement portion located in the circumferential direction of the injection hole. The fourth reinforcement portion and the second reinforcement portion are respectively provided correspondingly on the surface of the substrate and the bottom surface of the substrate. The fourth reinforcement portion is connected with the third reinforcement portion to form a whole. The fourth reinforcement portion protrudes from the bottom surface of the substrate.

9. The battery cover according to claim 8, characterized in that: The bottom surface of the third reinforcement portion and the bottom surface of the fourth reinforcement portion are both planes, and the bottom surface of the third reinforcement portion is flush with the bottom surface of the fourth reinforcement portion.

10. A battery, characterized in that: Comprising a battery cover as described in any one of claims 1-9.

Images