Battery Anti-explosion valve, battery cover plate assembly and battery

Abstract

The present utility model is in the field of new energy power batteries, and relates to a battery anti-explosion valve, a battery cover plate assembly and a battery. A battery anti-explosion valve, comprising an oblong-shaped body, a middle portion of the body being recessed to form a recessed cavity, and an edge of the body forming a connecting portion. The battery anti-explosion valve is characterized in that two arc-shaped edges of the recessed cavity are each provided with a non-closed first thinned portion in the circumferential direction, a linear edge of the recessed cavity is provided with a second thinned portion connecting the two first thinned portions, and the thickness of the first thinned portions is less than that of the second thinned portion. According to the battery anti-explosion valve provided in the present utility model, the structural design of the anti-explosion valve is optimized. The first thinned portions and the second thinned portion are designed to have different thicknesses, such that when the anti-explosion valve is acted upon by gas pressure, the first thinned portions open first, and then the second thinned portion is driven to open, so as to enhance the reliability of the anti-explosion valve in the thickness direction, thereby effectively withstanding fatigue caused by cyclic breathing swelling force in the thickness direction, and improving overall safety and reliability of explosion prevention.

Description

Battery explosion-proof valve, battery cover assembly and battery Technical Field

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

[0002] Lithium batteries, with their high energy density, lack of memory effect, long single-cell cycle times, and high efficiency, cleanliness, and pollution-free performance, are widely used in portable electronic products such as mobile phones, laptops, and digital cameras. They also have promising applications in areas such as electric vehicles. In recent years, driven by the dual pressures of policy and cost competition, new energy technologies have been required to continuously move towards lower costs and simpler manufacturing processes. With the advent of blade batteries, modular and standardized designs are gaining increasing attention from major battery manufacturers.

[0003] During the use of blade batteries, factors such as charging and discharging, as well as chemical reactions within the battery, can generate abnormal gases inside the battery casing, leading to excessive pressure inside the battery casing. If the internal pressure of the casing continues to increase, it can lead to excessive internal pressure in the battery, resulting in a battery explosion accident, which can damage the product and even directly threaten human life and property. To this end, an explosion-proof valve is usually installed in the casing. When the internal pressure of the battery is too high, the explosion-proof valve will explode and release the pressure.

[0004] For example, the Chinese patent document with publication number CN209981340U proposes an explosion-proof valve, which includes an explosion-proof valve body and a first notch and a second notch arranged around the explosion-proof valve body. The first notch and the second notch are connected to form a thinned portion, and there is also a thicker straight portion. When the pressure in the battery shell is too high, the first notch and the second notch rupture, and the explosion-proof valve body is lifted up, but it will not separate from the cover plate, thereby avoiding damage to other components caused by the separation of the explosion-proof valve. However, in actual application, we found that the explosion-proof valve is not only affected by the internal air pressure, but is also easily affected by the expansion of the battery cell in the thickness direction. When the battery cell expands in the thickness direction, the notch in the straight portion is easy to rupture, which directly causes the explosion-proof valve to burst, resulting in direct leakage and failure of the explosion-proof valve.

[0005] Utility Model Content

[0006] 1. Problems to be solved

[0007] In view of the problem in the prior art that conventional explosion-proof valves will directly burst open due to the pulling force of the expanded battery cell thickness, thereby causing leakage and failure, the utility model provides a battery explosion-proof valve, which can prevent the explosion-proof valve from being opened by the pulling force of the expanded battery cell thickness before it bursts open due to the impact of internal pressure, thereby improving the stability of the explosion-proof valve.

[0008] 2. Technical solution

[0009] In order to solve the above problems, the present invention adopts the following technical solutions.

[0010] A battery explosion-proof valve includes a waist-shaped body, a recessed groove in the middle of the body, and a connecting portion formed at the edge of the body. Two arcuate edges of the groove are circumferentially provided with a non-enclosed first thinning portion, and a straight edge of the groove is provided with a second thinning portion connecting the two first thinning portions, wherein the thickness of the first thinning portion is smaller than that of the second thinning portion.

[0011] Furthermore, the thickness of the first thinned portion is 0.08-0.12 cm, and the thickness of the second thinned portion is 0.12-0.15 cm.

[0012] Furthermore, another straight edge of the sink is provided with a third thinning portion connecting the two first thinning portions, and the thickness of the third thinning portion is greater than that of the first thinning portion and the second thinning portion.

[0013] Furthermore, the thickness of the third thinned portion is 0.3-0.4 cm.

[0014] Furthermore, the first thinning portion, the second thinning portion and the third thinning portion are formed by trapezoidal notches on the edge of the sink.

[0015] Furthermore, the middle portion of the sink is convex facing away from the concave direction, and a plurality of arc-shaped reinforcing ribs are provided on the sink.

[0016] A battery cover plate assembly comprises a cover plate, on which a positive electrode column and / or a negative electrode column is arranged, and the battery explosion-proof valve mentioned above.

[0017] Furthermore, a liquid injection hole is provided on the cover plate.

[0018] A battery comprises a shell with at least one end open, wherein the shell opening is provided with the above-mentioned battery cover.

[0019] A battery comprises a shell with at least one end open, wherein the battery explosion-proof valve is provided on the peripheral side surface of the shell.

[0020] 3. Beneficial effects

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] The utility model provides a battery explosion-proof valve, which optimizes the design of the explosion-proof valve structure and provides a first thinning portion and a second thinning portion with different thicknesses. When affected by air pressure, the first thinning portion opens first, and then drives the second thinning portion to open. When not affected by air pressure, the second thinning portion will not burst due to the pulling force of the battery cell thickness expansion, thereby enhancing the reliability of the explosion-proof valve in the thickness direction, effectively resisting the fatigue caused by the cyclic breathing expansion force in the thickness direction, and improving the overall safety and reliability of explosion protection. In addition, since the sink has a relatively thick straight edge portion, this section will not open when the first thinning portion and the second thinning portion burst, thereby preventing the explosion-proof valve material strip from breaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a schematic structural diagram of a battery explosion-proof valve according to an embodiment;

[0024] FIG2 is a cross-sectional view of a section at point A in FIG1 ;

[0025] FIG3 is a cross-sectional view of a section at point B in FIG1 ;

[0026] Figure 4 is an enlarged view of point I in Figure 2;

[0027] Figure 5 is an enlarged view of point II in Figure 3;

[0028] Figure 6 is an enlarged view of point III in Figure 3;

[0029] FIG7 is a schematic structural diagram of a battery according to an embodiment;

[0030] FIG8 is a schematic structural diagram of another battery according to an embodiment.

[0031] In the picture:

[0032] 1. Main body; 101. Sink; 102. Connecting part; 103. First thinning part; 104. Second thinning part; 105. Third thinning part; 106. Arc-shaped reinforcing rib; 2. Cover; 3. Positive pole; 4. Negative pole; 5. Liquid injection hole; 6. Shell. DETAILED DESCRIPTION

[0033] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention will be further described below in conjunction with embodiments.

[0034] A battery explosion-proof valve, see Figures 1 and 2, has a main body 1 in a waist-shaped shape, with a recessed groove 101 formed in the middle of the body 1, which can be formed by stamping or other processing methods. A connecting portion 102 is formed on the edge of the body 1 to facilitate the installation of the entire explosion-proof valve.

[0035] Referring to Figures 1 and 4 , a non-enclosed first thinned portion 103 is circumferentially disposed along the two arcuate edges of the sink 101. Referring to Figures 1 and 5 , a second thinned portion 104 is disposed on a straight edge of the sink 101, connecting the two first thinned portions 103. The thickness of the first thinned portion 103 is smaller than that of the second thinned portion 104. Consequently, when the explosion-proof valve is affected by air pressure, the first thinned portion 103 opens first, which in turn drives the second thinned portion 104 to open. This enhances the reliability of the explosion-proof valve in the thickness direction, effectively resisting fatigue caused by cyclical expansion forces in the thickness direction, and improving the overall safety and reliability of the explosion-proof structure. Furthermore, because the sink 101 also has a relatively thick straight edge, this section will not open when the first and second thinned portions 103, 104 explode, preventing the explosion-proof valve strip from breaking.

[0036] In another possible embodiment, referring to FIG. 1 and FIG. 6 , another straight edge of the sink 101 is provided with a third thinning portion 105 connecting the two first thinning portions 103 , and the thickness of the third thinning portion 105 is greater than that of the first thinning portion 103 and the second thinning portion 104 .

[0037] In one possible embodiment, the first thinned portion 103, the second thinned portion 104, and the third thinned portion 105 are formed by a trapezoidal notch on the edge of the sink 101. The angle formed by the two side edges of the trapezoidal notch cross section is 45°-60°. The thickness of the first thinned portion 103 is 0.08-0.12 cm, the thickness of the second thinned portion 104 is 0.12-0.15 cm, and the thickness of the third thinned portion 105 is 0.3-0.4 cm.

[0038] In order to enhance the structural strength of the explosion-proof valve, the middle portion of the sink 101 is convex facing away from the concave direction, and a plurality of arc-shaped reinforcing ribs 106 are provided on the sink 101 .

[0039] Referring to FIG7 , one embodiment of the present invention further provides a battery cover assembly, comprising a cover plate 2, on which a positive electrode column 3 and / or a negative electrode column 4 are disposed, and the battery explosion-proof valve described above, which can be disposed between the positive electrode column 3 and the negative electrode column 4. Furthermore, a liquid injection hole 5 is also disposed on the cover plate 2.

[0040] An embodiment of the present invention further provides a battery, comprising a shell 6 with at least one end open, and the above-mentioned battery cover is provided at the opening of the shell 6.

[0041] In another possible embodiment, referring to FIG. 8 , a battery includes a shell 6 with at least one end open, and the battery explosion-proof valve described above is provided on the side surface of the shell 6 .

[0042] In the description of this patent, it should be understood that the terms "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "front", "back", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the utility model 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 cannot be understood as a limitation on this patent.

[0043] In this patent, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; and they may refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this patent based on the specific circumstances.

[0044] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions merely illustrate the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. These changes and improvements should all fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A battery explosion-proof valve, comprising a body (1) in a round shape, wherein the middle of the body (1) is sunken to form a sink (101), and the edge of the body (1) forms a connecting portion (102), characterized in that: Two arc-shaped edges of the sink groove (101) are circumferentially provided with non-enclosed first thinning portions (103), and a straight edge of the sink groove (101) is provided with a second thinning portion (104) connecting the two first thinning portions (103), and the thickness of the first thinning portion (103) is smaller than that of the second thinning portion (104).

2. The battery explosion-proof valve according to claim 1, characterized in that: The thickness of the first thinned portion (103) is 0.08-0.12 cm, and the thickness of the second thinned portion (104) is 0.12-0.15 cm.

3. The battery explosion-proof valve according to claim 1, characterized in that: The other straight edge of the sink (101) is provided with a third thinning portion (105) connecting the two first thinning portions (103), and the thickness of the third thinning portion (105) is greater than that of the first thinning portion (103) and the second thinning portion (104).

4. The battery explosion-proof valve according to claim 3, characterized in that: The thickness of the third thinned portion (105) is 0.3-0.4 cm.

5. The battery explosion-proof valve according to claim 3, characterized in that: The first thinned portion (103), the second thinned portion (104) and the third thinned portion (105) are formed by trapezoidal notches on the edge of the sink (101).

6. The battery explosion-proof valve according to any one of claims 1 to 5, characterized in that: The middle part of the sink (101) is convex facing away from the concave direction, and a plurality of arc-shaped reinforcing ribs (106) are arranged on the sink (101).

7. A battery cover assembly, comprising a cover sheet (2), characterized in that: The cover sheet (2) is provided with a positive electrode column (3) and / or a negative electrode column (4), and a battery explosion-proof valve according to any one of claims 1 to 6.

8. The battery cover assembly according to claim 7, characterized in that: The cover sheet (2) is also provided with a liquid injection hole (5).

9. A battery, comprising a housing (6) with at least one end being open, characterized in that: The battery cover assembly according to claim 7 or 8 is arranged at the opening of the shell (6).

10. A battery, comprising a housing (6) with at least one end being open, characterized in that: The battery explosion-proof valve according to any one of claims 1 to 6 is arranged on the peripheral side of the shell (6).

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