Explosion-proof valve, battery cover plate assembly and single battery

Abstract

The utility model belongs to the technical field of batteries, and discloses an anti-explosion valve, a battery cover plate assembly and a single battery. The anti-explosion valve comprises an anti-explosion valve body, an annular structure is formed on the anti-explosion valve body through stamping, the annular structure comprises a connecting part, a weak part and two transition parts, the connecting part is connected with the anti-explosion valve body, the thickness of the weak part is smaller than that of the anti-explosion valve body, and the two transition parts are connected with the connecting part. The two transition parts are arranged between the connecting part and the weak part so as to define an annular structure, and the thickness of the transition parts is reduced from the connecting part to the weak part. According to the anti-explosion valve, the reliability of the anti-explosion valve is improved, and the safety of the single battery provided with the anti-explosion valve is also improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an explosion-proof valve, a battery cover assembly and a single battery. Background Art

[0002] With the continuous development of new energy sources and the increasing capacity of batteries, battery safety has become increasingly important. Batteries are typically equipped with explosion-proof valves to prevent explosions. These valves are notched so that when a cell experiences thermal runaway, the valve, as the cell's weakest area, opens first, preventing explosions and other safety incidents.

[0003] At present, the main processes for forming explosion-proof valves for battery cells include continuous stamping or scoring. For explosion-proof valves formed by continuous stamping, they must be connected to the battery cover or shell through laser welding. When the battery cell experiences an abnormality or thermal runaway, the explosion-proof valve opens along the scoring. There is a possibility that the part in the middle of the scoring will be torn off, causing it to detach from the single cell, which may splash onto other single cells or conductive connectors, which may cause other safety issues. For explosion-proof valves formed by scoring, the main method is to form a weak area on the battery cover or shell through corrosion or laser carving. Due to the limitations of the material of the battery cover or shell, the scoring of the explosion-proof valve is uneven and has large errors. This may cause the explosion-proof valve to open before reaching the opening pressure or still not open after reaching the opening pressure, thereby causing safety issues for the single cell.

[0004] Therefore, there is an urgent need for an explosion-proof valve, a battery cover assembly and a single battery to solve the above technical problems. Utility Model Content

[0005] One purpose of the utility model is to provide an explosion-proof valve, which can improve the reliability and safety of the explosion-proof valve, so that it can open when the opening pressure is reached without splashing out and affecting other structures.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] An explosion-proof valve includes an explosion-proof valve body, and an annular structure is stamped on the explosion-proof valve body. The annular structure includes a connecting portion, a weak portion and two transition portions. The connecting portion is connected to the explosion-proof valve body, and the thickness of the weak portion is less than the thickness of the explosion-proof valve body. The two transition portions are both arranged between the connecting portion and the weak portion to enclose and form an annular structure. The thickness of the transition portion decreases from the connecting portion to the weak portion.

[0008] Optionally, the thickness of the connecting portion is not less than the thickness of the explosion-proof valve body.

[0009] Optionally, the total length of the connecting portion is L1, and L1 is ≥ 5 mm.

[0010] Optionally, the total length of the weak portion is L2, the total length of the annular structure is L, and L2≤0.5L.

[0011] Optionally, the wall thickness of the transition portion close to one end of the connecting portion is D1, the wall thickness of the connecting portion is D2, and D1 < (D2-0.05) mm.

[0012] Optionally, the annular structure is circular or elliptical in shape.

[0013] Optionally, the notch shape of the above-mentioned weak portion and the notch shape of the above-mentioned transition portion are both square or inverted trapezoidal.

[0014] Optionally, a base is protruded from the outer periphery of the explosion-proof valve body, and the base is used to connect to an external structure. The thickness of the explosion-proof valve body is smaller than the thickness of the base.

[0015] Another object of the present invention is to provide a battery cover assembly that can improve the reliability and safety of the explosion-proof valve, so that it opens when the opening pressure is reached without splashing out and affecting other structures.

[0016] To achieve this purpose, the present invention adopts the following technical solutions:

[0017] A battery cover assembly includes the explosion-proof valve described in any of the above solutions.

[0018] Another object of the present invention is to provide a single battery that can improve the reliability and safety of the explosion-proof valve, so that it opens when the opening pressure is reached without splashing out and affecting other structures.

[0019] To achieve this purpose, the present invention adopts the following technical solutions:

[0020] A single cell battery, wherein the single cell battery includes the battery cover assembly described in the above scheme, or the single cell battery includes the explosion-proof valve described in any of the above schemes.

[0021] Beneficial effects of the utility model:

[0022] The utility model provides an explosion-proof valve, a battery cover assembly, and a single battery. By dividing its annular structure into a connecting portion connected to the explosion-proof valve body, a weak portion for being ruptured by air pressure, and a transition portion therebetween, the notch of the explosion-proof valve can be uniformly and gradually deepened from the transition portion to the weak portion. Therefore, when the pressure inside the single battery using the explosion-proof valve reaches the opening pressure of the explosion-proof valve, the weak portion ruptures and gradually opens along the transition portion. However, since the connecting portion serves as a connection between the notch and the explosion-proof valve body, and the gradually decreasing thickness of the transition portion cushions the impact of the rupture, preventing the valve from completely rupturing and flying onto other structures. This improves the reliability of the explosion-proof valve and the safety of the single battery in which the explosion-proof valve is installed. Furthermore, since the annular structure is formed by stamping, it is not affected by the materials of the battery cover assembly and the housing in the single battery, thereby improving processing accuracy, further improving the reliability of the explosion-proof valve and the safety of the single battery in which the explosion-proof valve is installed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is an axonometric diagram of an explosion-proof valve provided in some embodiments of the present utility model;

[0024] Figure 2 is a top view of an explosion-proof valve provided in some embodiments of the present utility model;

[0025] Figure 3 is an axonometric diagram of an explosion-proof valve provided in some other embodiments of the present utility model;

[0026] Figure 4 is a top view of an explosion-proof valve provided in some other embodiments of the present utility model;

[0027] Figure 5 is an axonometric view of a battery cover assembly provided in some embodiments of the present invention;

[0028] Figure 6 This is an axonometric view of the battery cover assembly provided in some embodiments of the present invention, with the explosion-proof membrane hidden.

[0029] In the picture:

[0030] 10. Explosion-proof valve body;

[0031] 20. Ring structure; 21. Connecting portion; 22. Weak portion; 23. Transition portion;

[0032] 30. Matrix;

[0033] 200. Cover plate body; 300. Pole assembly; 400. Explosion-proof membrane. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0035] In the description of this utility model, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to direct connection or indirect connection through an intermediate medium; they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0036] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0037] In the description of this embodiment, the terms "upper," "lower," "left," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0038] Please refer to the attached Figure 1 To the attached Figure 6 The utility model introduces an explosion-proof valve, a battery cover assembly and a single battery.

[0039] Please refer to Figures 1 to 4 This embodiment provides an explosion-proof valve, which is arranged on the battery cover assembly or the housing to release the pressure inside the single battery, thereby improving the safety of the single battery.

[0040] Specifically, the explosion-proof valve includes an explosion-proof valve body 10, on which an annular structure 20 is stamped. The annular structure 20 includes a connecting portion 21, a weak portion 22 and two transition portions 23. The connecting portion 21 is connected to the explosion-proof valve body 10, and the thickness of the weak portion 22 is less than the thickness of the explosion-proof valve body 10. The two transition portions 23 are both arranged between the connecting portion 21 and the weak portion 22 to enclose the annular structure 20. The thickness of the transition portion 23 decreases from the connecting portion 21 to the weak portion 22.

[0041] The explosion-proof valve in this embodiment divides its annular structure 20 into a connecting portion 21 connected to the explosion-proof valve body 10, a weak portion 22 designed to be ruptured by air pressure, and a transition portion 23 between the two. This allows the scoring of the explosion-proof valve to gradually deepen from the transition portion 23 to the weak portion 22. As a result, when the pressure inside the battery cell using the explosion-proof valve reaches the opening pressure of the explosion-proof valve, the weak portion 22 ruptures and gradually opens along the transition portion 23. However, because the connecting portion 21 serves as a connection between the scoring and the explosion-proof valve body 10, and the gradually decreasing thickness of the transition portion 23 cushions the impact of the rupture, preventing the explosion from completely rupturing and flying onto other structures. This improves the reliability of the explosion-proof valve and the safety of the battery cell in which it is installed. Furthermore, because the annular structure 20 is formed by stamping, it is not affected by the materials of the battery cover assembly and shell in the battery cell, improving processing accuracy, further improving the reliability of the explosion-proof valve and the safety of the battery cell in which it is installed.

[0042] In some embodiments, the shape of the annular structure 20 is circular or elliptical, both of which can achieve the functions of partially breaking open to release pressure and partially connecting with the explosion-proof valve body 10.

[0043] In some embodiments, the notch shape of the weakened portion 22 and the notch shape of the transition portion 23 are both square or inverted trapezoidal, which enables the notch to be stamped. For example, the notch shape of the weakened portion 22 and the notch shape of the transition portion 23 are both inverted trapezoidal. The inverted trapezoidal shape provides guidance during the breaking process and high stamping accuracy, thereby improving the opening accuracy of the explosion-proof valve.

[0044] In some embodiments, the thickness of the connecting portion 21 is not less than the thickness of the explosion-proof valve body 10. Figure 1 and Figure 2 , that is, the connecting portion 21 can be the same thickness as the explosion-proof valve body 10, so that the connection between the connecting portion 21 and the explosion-proof valve body 10 is stable, preventing the explosion-proof valve body 10 from splashing onto other structures and causing safety problems, thereby improving the safety of the explosion-proof valve. Figure 3 and Figure 4The connecting portion 21 may also be larger than the thickness of the explosion-proof valve body 10, so that the structure of the connecting portion 21 is firm and will not be torn apart from the explosion-proof valve body 10 by the weak portion 22 and the transition portion 23, causing part of the explosion-proof valve body 10 to splash to other structures and cause safety problems, thereby improving the safety of the explosion-proof valve.

[0045] Optionally, the total length of the connecting portion 21 is L1, L1 ≥ 5 mm, which can further ensure that the connecting portion 21 will not be driven by the weak portion 22 and the transition portion 23 to tear apart from the explosion-proof valve body 10, thereby improving the safety and reliability of the explosion-proof valve.

[0046] In some embodiments, the total length of the weak portion 22 is L2, the total length of the annular structure 20 is L, and L2≤0.5L, so that the weak portion 22 will not cause the explosion-proof valve body 10 to tear.

[0047] For example, L2=0.5L, which can ensure that the explosion-proof valve can be opened under the opening pressure without causing the explosion-proof valve body 10 to tear open.

[0048] In some embodiments, the wall thickness of the transition portion 23 near the connecting portion 21 is D1, and the wall thickness of the connecting portion 21 is D2, where D1<(D2-0.05) mm. That is, the thickness of the transition portion 23 gradually decreases from the connecting portion 21 to the weak portion 22.

[0049] In some embodiments, a base 30 is provided on the outer periphery of the explosion-proof valve body 10. The base 30 is used to connect to an external structure. The thickness of the explosion-proof valve body 10 is less than that of the base 30. The base 30 is provided for connection with the external structure so that the explosion-proof valve can be fixed to the external structure.

[0050] Please refer to Figure 5 and Figure 6 This embodiment also provides a battery cover assembly, which includes the explosion-proof valve described in any of the above-mentioned solutions. The use of this explosion-proof valve improves the reliability of the battery cover assembly. Furthermore, all the benefits of the battery cover assembly including the above-mentioned explosion-proof valve are not further elaborated here.

[0051] In some embodiments, the battery cover assembly includes a cover body 200, and the explosion-proof valve is sealed on the cover body 200. Optionally, the explosion-proof valve and the cover body 200 are welded to ensure sealing between the two.

[0052] In some embodiments, the battery cover assembly further includes one or two pole assemblies 300 to achieve external electrical connection of the single battery on which the battery cover assembly is installed.

[0053] In some embodiments, the battery cover assembly further includes an explosion-proof membrane 400, which is provided on one side of the explosion-proof valve. The setting of the explosion-proof membrane 400 provides certain protection for the explosion-proof valve to prevent impurities or damage from affecting the opening of the explosion-proof valve.

[0054] Optionally, a notch groove is provided on the explosion-proof membrane 400 to prevent the explosion-proof membrane 400 from affecting the explosion-proof pressure relief of the single battery.

[0055] This embodiment also provides a single cell battery, comprising the aforementioned battery cover assembly, or comprising the explosion-proof valve described in any of the aforementioned solutions. Specifically, the single cell battery includes an explosion-proof valve, which can be located on the battery cover assembly or on the housing to provide explosion-proof and pressure-relieving properties for the single cell battery. By employing the aforementioned explosion-proof valve, the single cell battery not only maintains explosion-proof and pressure-relieving properties but also prevents splashing of parts of the explosion-proof valve that could cause safety issues with other components, thereby improving the safety and reliability of the single cell battery.

[0056] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. Explosion-proof valve, characterized in that, The invention comprises an explosion-proof valve body (10), wherein an annular structure (20) is formed by punching on the explosion-proof valve body (10), wherein the annular structure (20) comprises a connecting portion (21), a weak portion (22) and two transition portions (23), wherein the connecting portion (21) is connected to the explosion-proof valve body (10), the thickness of the weak portion (22) is less than the thickness of the explosion-proof valve body (10), and the two transition portions (23) are both arranged between the connecting portion (21) and the weak portion (22) to enclose and form the annular structure (20), and the thickness of the transition portion (23) decreases from the connecting portion (21) to the weak portion (22).

2. The explosion-proof valve according to claim 1, characterized in that: The thickness of the connecting portion (21) is not less than the thickness of the explosion-proof valve body (10).

3. The explosion-proof valve according to claim 1, characterized in that: The total length of the connecting portion (21) is L1, and L1 is ≥ 5 mm.

4. The explosion-proof valve according to claim 1, characterized in that: The total length of the weak portion (22) is L2, the total length of the annular structure (20) is L, and L2≤0.5L.

5. The explosion-proof valve according to claim 1, characterized in that: The wall thickness of the transition portion (23) close to one end of the connecting portion (21) is D1, and the wall thickness of the connecting portion (21) is D2, where D1 is less than (D2-0.05) mm.

6. The explosion-proof valve according to claim 1, characterized in that: The shape of the annular structure (20) is circular or elliptical.

7. The explosion-proof valve according to claim 1, characterized in that: The notch shape of the weak portion (22) and the notch shape of the transition portion (23) are both square or inverted trapezoidal.

8. The explosion-proof valve according to claim 1, characterized in that: A base (30) is protruding from the outer periphery of the explosion-proof valve body (10), and the base (30) is used to connect to an external structure. The thickness of the explosion-proof valve body (10) is smaller than the thickness of the base (30).

9. Battery cover assembly, characterized in that: The explosion-proof valve comprises the explosion-proof valve according to any one of claims 1 to 8.

10. A single cell battery, characterized in that: The single battery includes the battery cover assembly according to claim 9, or the single battery includes the explosion-proof valve according to any one of claims 1 to 8.

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