Three-section type reinforced indented anti-explosion valve

Abstract

The utility model discloses a three-section reinforced nick explosion-proof valve, which comprises an explosion-proof valve body and a first nick part, a second nick part is arranged on the explosion-proof valve body on the periphery of the first nick part, and the first nick part is a crossed nick; and a first valve plate is defined in the range of the second nick part. The second nick part comprises a first linear section, a first arc section, a second linear section, a second arc section and a middle area of the first linear section which are sequentially connected in an annular shape, namely, the anti-pressure capability of the deepening nick is the minimum, and when the explosion-proof valve main body is subjected to pressure, the explosion-proof valve main body begins to break from the deepening nick; and the first valve plate is broken orderly along the trace of the second nick part, so that the working stability of the anti-explosion valve main body can be improved, the blasting force generated by the anti-explosion valve main body can be reduced, and the use safety of the anti-explosion valve main body is improved. The check valve is simple in structure, and the at least three-section type second nick part is adopted, so that the first valve plate is turned up under the action of gas pressure, and gas is quickly discharged.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium batteries, and particularly relates to a three-section reinforced notch explosion-proof valve. Background Art

[0002] A lithium battery is a type of battery with lithium metal or lithium alloy as the positive / negative electrode material and using a non-aqueous electrolyte solution. With the continuous development of the battery industry, lithium-ion batteries, with their advantage of high energy density, are widely used in the field of power batteries to provide power for vehicle operation. The explosion-proof valve plays a crucial role in the safety of the battery cell. When problems such as short circuit, overcharge, and overheat occur in the battery cell, the explosion-proof valve opens in a timely manner by sensing the change in the internal air pressure of the battery cell to exhaust and relieve pressure, avoiding risks such as explosion or fire of the battery cell. However, the existing explosion-proof valves often do not burst along the notch when bursting, reducing safety. Therefore, it is very important to obtain a three-section reinforced notch explosion-proof valve that overcomes the above defects. Summary of the Utility Model

[0003] To solve the above-mentioned at least one technical problem, the utility model provides a three-section reinforced notch explosion-proof valve, including an explosion-proof valve body. A first notch portion is provided on the explosion-proof valve body, and a second notch portion is provided on the explosion-proof valve body outside the periphery of the first notch portion. The first notch portion is a cross notch; a first valve piece is formed within the range of the second notch portion. The second notch portion is an annular notch provided around the cross notch, and the cross notch and the annular notch are both located on one side surface of the explosion-proof valve body, or the cross notch and the annular notch are respectively located on the upper surface or the lower surface of the explosion-proof valve body.

[0004] The second notch portion includes a first straight line segment, a first arc segment, a second straight line segment, and a second arc segment that are sequentially connected to form an annular shape. At least part of the thickness of the first straight line segment and / or at least part of the thickness of the second straight line segment is different from at least part of the thickness of the first arc segment and / or at least part of the thickness of the second arc segment.

[0005] The thickness of the second notch portion is greater than or equal to the thickness of the first notch portion.

[0006] The thicknesses of the first arc segment and the second arc segment are the same.

[0007] A deepened notch is provided downward on the first straight line segment so that at least part of the thickness of the first straight line segment is greater than that of the first arc segment and the second arc segment. The deepened notch is provided in the middle of the first straight line segment, and the thicknesses of the first straight line segments on both sides are the same as those of the first arc segment and the second arc segment.

[0008] An upward protrusion is provided on the bottom surface of the second straight segment. A shallow notch is formed between the upper surface of the upward protrusion and the upper surface of the second straight segment, so that at least part of the thickness of the second straight segment is smaller than that of the first arc segment and the second arc segment. The shallow notch is provided in the middle of the second straight segment, and the thickness of the second straight segment on both sides is the same as that of the first arc segment and the second arc segment.

[0009] In the middle area of the first straight segment of the present utility model, that is, the anti-pressure ability of the deepened notch is the smallest. When the explosion-proof valve body is under pressure, it starts to break from the deepened notch, and the first valve piece breaks orderly along the trace of the second notch part, which can not only improve the working stability of the explosion-proof valve body, but also reduce the blasting force generated by the explosion-proof valve body and improve the use safety of the explosion-proof valve body.

[0010] The cross-notch includes a first notch and a second notch, and the first notch and the second notch are cross-connected to form an included angle. The cross-notch is a cross-notch formed by the perpendicularity of the first notch and the second notch. The center of the cross-notch is concentric with the center of the present utility model.

[0011] The setting of the first notch can facilitate the rupture of the first valve piece or rupture when the second notch part fails.

[0012] A boss ring is provided on the outer edge part of the explosion-proof valve body located on the periphery of the second notch part. The upper surface of the boss ring forms a first step surface, and the surface of the explosion-proof valve body forms a second step surface.

[0013] The cross-section of the second notch part is trapezoidal.

[0014] The length of the first notch is 10 - 25 mm, preferably 24.38 mm. The distance from the end of the first notch to the first arc segment or the second arc segment 1024 is 0.5 - 3 mm, preferably 1.41 mm; the length of the second notch is 5 - 13 mm, preferably 12.38 mm. The distance from the end of the second notch to the first straight segment or the second straight segment is 0.5 - 3 mm, preferably 1.41 mm.

[0015] Compared with the prior art, the advantages of the present utility model are as follows: The structure of the present utility model is simple. It adopts at least a three-segment second notch part to turn up the first valve piece under the action of gas pressure, so as to quickly discharge the gas, reduce the situation that the first valve piece directly flies out under impact and damages the components near the battery cell, and improve the use safety of the explosion-proof valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a perspective view of the present utility model;

[0017] Figure 2 This is the front view of the present utility model;

[0018] Figure 3 It is Figure 2 the schematic cross-sectional view at C-C of

[0019] Figure 4 It is Figure 2 the schematic cross-sectional view at D-D of

[0020] Figure 5 It is Figure 2 the schematic cross-sectional view at A-A of

[0021] Figure 6 It is Figure 2 the schematic cross-sectional view at B-B of

[0022] Reference numerals:

[0023] 1 explosion-proof valve body; 101 first notch part; 1011 first notch; 1012 second notch;

[0024] 102 second notch part; 1021 first straight segment; 10211 deepened notch; 1022 first arc segment; 1023 second straight segment; 10231 shallow notch; 10232 upward bulge; 1024 second arc segment;

[0025] 103 first valve disc;

[0026] 104 boss ring; 105 first step surface; 106 second step surface. Specific embodiments

[0027] In order to enable those skilled in the art to better understand the present utility model and thus more clearly define the scope of protection required by the present utility model, the present utility model will be described in detail below with respect to certain specific embodiments of the present utility model. It should be noted that the following are only some specific embodiments of the concept of the present utility model and only a part of the embodiments of the present utility model. The specific and direct descriptions of the relevant structures are only for the convenience of understanding the present utility model, and each specific feature does not of course and directly limit the scope of implementation of the present utility model.

[0028] As shown in the attached drawings, the present utility model adopts the following technical solutions. A three-stage reinforced notch explosion-proof valve includes an explosion-proof valve body 1. A first notch portion 101 is provided on the explosion-proof valve body 1. A second notch portion 102 is provided on the explosion-proof valve body 1 outside the periphery of the first notch portion 101. The first notch portion 101 is a cross notch; a first valve piece 103 is formed within the range of the second notch portion 102. The second notch portion 102 is an annular notch arranged around the cross notch, and the cross notch and the annular notch are both located on one side surface of the explosion-proof valve body 1, or the cross notch and the annular notch are respectively located on the upper surface or the lower surface of the explosion-proof valve body 1.

[0029] The second notch portion 102 includes a first straight segment 1021, a first arc segment 1022, a second straight segment 1023, and a second arc segment 1024 that are sequentially connected to form an annular shape. At least part of the thickness of the first straight segment 1021 and / or at least part of the thickness of the second straight segment 1023 are different from at least part of the thickness of the first arc segment 1022 and / or at least part of the thickness of the second arc segment 1024.

[0030] The thickness of the second notch portion 102 is greater than or equal to the thickness of the first notch portion 101.

[0031] The thicknesses of the first arc segment 1022 and the second arc segment 1024 are the same.

[0032] A downward deepened notch 10211 is provided on the first straight segment 1021 so that at least part of the thickness of the first straight segment 1021 is greater than that of the first arc segment 1022 and the second arc segment 1024. The deepened notch 10211 is provided in the middle of the first straight segment 1021. The thicknesses of the first straight segments 1021 on both sides are the same as the thicknesses of the first arc segment 1022 and the second arc segment 1024. Slopes are provided on both sides of the deepened notch 10211.

[0033] An upward protrusion 10232 is provided on the bottom surface of the second straight segment 1023. A shallow notch 10231 is formed between the upper surface of the upward protrusion 10232 and the upper surface of the second straight segment 1023 so that at least part of the thickness of the second straight segment 1023 is less than that of the first arc segment 1022 and the second arc segment 1024. The shallow notch 10231 is provided in the middle of the second straight segment 1023. The thicknesses of the second straight segments 1023 on both sides are the same as the thicknesses of the first arc segment 1022 and the second arc segment 1024.

[0034] In the middle region of the first straight segment 1021 of the present utility model, that is, the anti-pressure ability of the deepened notch 10211 is the smallest. When the explosion-proof valve body is under pressure, it starts to break from the deepened notch 10211, and the first valve piece 103 ruptures orderly along the trace of the second notch part 102, which can not only improve the working stability of the explosion-proof valve body, but also reduce the blasting force generated by the explosion-proof valve body and improve the use safety of the explosion-proof valve body.

[0035] The cross-notch includes a first notch 1011 and a second notch 1012, and the first notch 1011 and the second notch 1012 are cross-connected to form an included angle. The cross-notch is a cross-notch formed by the first notch 1011 and the second notch 1012 being perpendicular. The center of the cross-notch is concentric with the center of the present utility model.

[0036] The setting of the first notch 1011 can facilitate the rupture of the first valve piece 103, or rupture when the second notch part 102 fails.

[0037] An outer edge portion of the explosion-proof valve body 1 on the periphery of the second notch part 102 is provided with a boss ring 104, a first stepped surface 105 is formed on the upper surface of the boss ring 104, and a second stepped surface 106 is formed on the surface of the explosion-proof valve body 1.

[0038] The cross-section of the second notch part 102 is trapezoidal.

[0039] The length of the first notch 1011 is 10 - 25 mm, preferably 24.38 mm, and the distance from the end of the first notch 1011 to the first arc segment 1022 or the second arc segment 1024 is 0.5 - 3 mm, preferably 1.41 mm; the length of the second notch 1012 is 5 - 13 mm, preferably 12.38 mm, and the distance from the end of the second notch 1012 to the first straight segment 1021 or the second straight segment 1023 is 0.5 - 3 mm, preferably 1.41 mm.

[0040] Compared with the prior art, the advantages of the present utility model are as follows: The structure of the present utility model is simple, and at least a three-section second notch part 102 is adopted to turn up the first valve piece 103 under the action of gas pressure, so as to quickly discharge the gas, reduce the situation that the first valve piece 103 directly flies out under impact and damages the components near the battery cell, and improve the use safety of the explosion-proof valve body.

[0041] So far, the technical solution of the present utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present utility model is obviously not limited to these specific embodiments. Without departing from the principle of the present utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present utility model.

Claims

1. A three-stage reinforced notched explosion-proof valve, characterized in that: The explosion-proof valve body (1) comprises an explosion-proof valve body (1), wherein a first notch portion (101) is provided on the explosion-proof valve body (1), and a second notch portion (102) is provided on the explosion-proof valve body (1) at the periphery of the first notch portion (101), wherein the first notch portion (101) is a cross notch; and the second notch portion (102) is an annular notch arranged around the cross notch, and the cross notch and the annular notch are both located on one side surface of the explosion-proof valve body (1), or the cross notch and the annular notch are respectively located on the upper surface or the lower surface of the explosion-proof valve body (1).

2. The three-stage reinforced notched explosion-proof valve according to claim 1 is characterized in that: The second notched portion (102) includes a first straight line segment (1021), a first arc segment (1022), a second straight line segment (1023) and a second arc segment (1024) which are sequentially connected in a ring shape, and the thickness of at least a portion of the first straight line segment (1021) and / or the thickness of at least a portion of the second straight line segment (1023) is different from the thickness of at least a portion of the first arc segment (1022) and / or the thickness of at least a portion of the second arc segment (1024).

3. The three-stage reinforced notched explosion-proof valve according to claim 1 is characterized in that: The first arc segment (1022) and the second arc segment (1024) have the same thickness; and / or, The cross notches include a first notch (1011) and a second notch (1012), and the first notch (1011) and the second notch (1012) are cross-connected to form an angle.

4. The three-stage reinforced notched explosion-proof valve according to claim 1 is characterized in that: The first straight line segment (1021) is provided with a downwardly deepened notch (10211) so that at least a portion of the thickness of the first straight line segment (1021) is greater than that of the first arc segment (1022) and the second arc segment (1024).

5. The three-stage reinforced notched explosion-proof valve according to claim 4 is characterized in that: The deepened notch (10211) is arranged in the middle of the first straight line segment (1021), and the thickness of the first straight line segment (1021) on both sides is consistent with the thickness of the first arc segment (1022) and the second arc segment (1024).

6. The three-stage reinforced notched explosion-proof valve according to claim 2 or 4, characterized in that: The bottom surface of the second straight line segment (1023) is provided with an upward protrusion (10232), and a shallow notch (10231) is formed between the upper surface of the upward protrusion (10232) and the upper surface of the second straight line segment (1023), so that at least part of the thickness of the second straight line segment (1023) is smaller than that of the first arc segment (1022) and the second arc segment (1024).

7. The three-stage reinforced notched explosion-proof valve according to claim 3 is characterized in that: The shallow notch (10231) is arranged in the middle of the second straight line segment (1023), and the thickness of the second straight line segment (1023) located on both sides is consistent with the thickness of the first arc segment (1022) and the second arc segment (1024).

8. The three-stage reinforced notched explosion-proof valve according to claim 7, characterized in that: The length of the first notch (1011) is 10-25 mm, and the distance from the end of the first notch (1011) to the first arc segment (1022) or the second arc segment (1024) is 0.5-3 mm; the length of the second notch (1012) is 5-13 mm, and the distance from the end of the second notch (1012) to the first straight line segment (1021) or the second straight line segment (1023) is 0.5-3 mm.

9. The three-stage reinforced notched explosion-proof valve according to claim 7, characterized in that: The cross notch is a cross notch formed vertically by the first notch (1011) and the second notch (1012).

10. The three-stage reinforced notched explosion-proof valve according to claim 1, characterized in that: A boss ring (104) is provided on the outer edge of the explosion-proof valve body (1) located on the peripheral side of the second notched portion (102); a first step surface (105) is formed on the upper surface of the boss ring (104); and a second step surface (106) is formed on the surface of the explosion-proof valve body (1); and / or the thickness of the second notched portion (102) is greater than or equal to the thickness of the first notched portion (101).

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