Explosion-proof valve, battery shell and battery monomer

Abstract

The invention belongs to the technical field of batteries, and discloses an anti-explosion valve, a battery shell and a battery single.The anti-explosion valve comprises a valve plate, the valve plate is provided with a nick, and the nick comprises a first linear section, a second linear section, a third linear section, a first arc-shaped section and a second arc-shaped section; the first linear section, the second linear section and the third linear section extend in the first direction and are sequentially arranged at intervals in the second direction, the first direction is perpendicular to the second direction, and the two ends of the first arc-shaped section are connected to the ends of the same sides of the first linear section and the second linear section correspondingly. According to the explosion-proof valve, the pressure relief area can be increased, the stress on the nick can be dispersed, and therefore the probability that the nick reaches a blasting value too early and is broken is reduced, and the effect of reducing the fluctuation range of the blasting value of the explosion-proof valve is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to an explosion-proof valve, a battery case and a battery cell. Background Art

[0002] In order to avoid explosion when a power battery malfunctions, an explosion-proof valve is generally added to the structure of the power battery. The explosion-proof valve is usually welded to the battery case or the cover plate. It can withstand a certain pressure. When the pressure inside the battery case exceeds the pressure it can withstand (i.e., the bursting value of the explosion-proof valve), the notch on the explosion-proof valve will break. Therefore, a large amount of gas can be discharged before the power battery explodes, thus turning the explosion into smoking and reducing the risk level.

[0003] Currently, the explosion-proof valves applied to cylindrical batteries are small in size. Therefore, notches can only be prepared on the explosion-proof valves with a small area. Common notches include O-shaped notches and C-shaped notches. The pressure relief areas of these two notches are small. Furthermore, the stress on the notches is relatively concentrated, and the notches are prone to reaching the bursting value prematurely and then breaking, increasing the fluctuation range of the bursting value of the explosion-proof valve.

[0004] Therefore, it is urgent to propose an explosion-proof valve, a battery case and a battery cell to solve the above technical problems. Summary of the Invention

[0005] The first object of the present invention is to provide an explosion-proof valve, which can increase the pressure relief area and disperse the stress on the notch, thereby reducing the probability that the notch reaches the bursting value prematurely and breaks, and playing a role in reducing the fluctuation range of the bursting value of the explosion-proof valve.

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

[0007] An explosion-proof valve, comprising a valve plate, and a notch is provided on the valve plate. The notch includes:

[0008] A first straight line segment, a second straight line segment and a third straight line segment. The first straight line segment, the second straight line segment and the third straight line segment all extend along a first direction, and the first straight line segment, the second straight line segment and the third straight line segment are sequentially spaced apart along a second direction. The first direction is perpendicular to the second direction;

[0009] A first arc segment and a second arc segment. The two ends of the first arc segment are respectively connected to the same-side ends of the first straight line segment and the second straight line segment, and the two ends of the second arc segment are respectively connected to the other same-side ends of the first straight line segment and the third straight line segment.

[0010] Optionally, the size of the valve plate in the first direction is f, and the size of the valve plate in the second direction is e, where f ≤ 14.0 mm and e ≤ 9.4 mm.

[0011] Optionally, the explosion-proof valve meets at least three of the following:

[0012] The distance between the inner wall of the first straight line segment on the side facing away from the third straight line segment and the inner wall of the third straight line segment on the side facing away from the first straight line segment is a, a≤4.8mm;

[0013] The sum of the length of the first straight line segment, the length of the second straight line segment, the length of the third straight line segment, the arc length of the first arc segment and the arc length of the second arc segment is b, b≤8.9 mm;

[0014] The distance between the inner wall of the second straight line segment facing the third straight line segment and the inner wall of the third straight line segment facing the second straight line segment is c, c≤1.2mm;

[0015] A distance d is provided between an inner wall of the first straight line segment on a side facing away from the second straight line segment and an inner wall of the second straight line segment on a side facing the first straight line segment, and d≤3.6 mm.

[0016] Optionally, a distance between an inner wall of the first straight line segment on a side facing away from the third straight line segment and an inner wall of the third straight line segment on a side facing away from the first straight line segment is a, and a≥3.9 mm;

[0017] and / or, the sum of the length of the first straight line segment, the length of the second straight line segment, the length of the third straight line segment, the arc length of the first arc segment and the arc length of the second arc segment is b, b≥8.0 mm;

[0018] and / or, a distance between an inner wall of the second straight line segment facing the third straight line segment and an inner wall of the third straight line segment facing the second straight line segment is c, and c≥0.3 mm;

[0019] And / or, a distance d between an inner wall of the first straight line segment on a side facing away from the second straight line segment and an inner wall of the second straight line segment on a side facing the first straight line segment is d, and d≥2.7 mm.

[0020] Optionally, the axis of the first arc segment is located on a side of the first arc segment facing the second arc segment, and the axis of the second arc segment is located on a side of the second arc segment facing the first arc segment.

[0021] Optionally, the first straight line segment, the second straight line segment and the third straight line segment are equal in length.

[0022] Optionally, the distance between the inner wall of the second straight line segment facing the first straight line segment and the inner wall of the first straight line segment facing the second straight line segment is j, and the distance between the inner wall of the second straight line segment facing the third straight line segment and the inner wall of the third straight line segment facing the second straight line segment is c, where j is greater than c.

[0023] Optionally, the valve plate includes a valve plate body and a convex edge. The notch is provided on the valve plate body. The convex edge is connected to the side wall of the valve plate body. The convex edge extends circumferentially along the valve plate body and is connected end to end. The thickness of the convex edge is greater than that of the valve plate body. The convex edge is used to connect to the housing or the cover plate of the battery case.

[0024] The second object of the present invention is to provide a battery case, and the bursting value fluctuation range of the explosion-proof valve of the battery case is relatively small.

[0025] To achieve this purpose, the present invention adopts the following technical solutions:

[0026] A battery case includes a housing, a cover plate, and the above-mentioned explosion-proof valve. The housing is provided with an open cavity. The cover plate covers the opening of the open cavity. The explosion-proof valve is provided on the housing or the cover plate.

[0027] The third object of the present invention is to provide a battery cell, and the bursting value fluctuation range of the explosion-proof valve of the battery cell is relatively small.

[0028] To achieve this purpose, the present invention adopts the following technical solutions:

[0029] A battery cell includes an electric core and the above-mentioned battery case. The electric core is arranged in the open cavity.

[0030] The beneficial effects of the present invention:

[0031] For the explosion-proof valve provided by the present invention, the notch includes a first straight line segment, a second straight line segment, a third straight line segment, a first arc segment, and a second arc segment. Among them, the first straight line segment, the second straight line segment, and the third straight line segment all extend along a first direction and are sequentially spaced apart along a second direction perpendicular to the first direction. The two ends of the first arc segment are respectively connected to the same-side ends of the first straight line segment and the second straight line segment. The two ends of the second arc segment are respectively connected to the other same-side ends of the first straight line segment and the third straight line segment, that is, the first straight line segment, the second straight line segment, and the third straight line segment are connected by the first arc segment and the second arc segment. Compared with the O-shaped notch and the C-shaped notch, this notch design increases the pressure relief area, can disperse the stress on the notch, thereby reducing the probability that the notch reaches the bursting value prematurely and breaks, and plays a role in reducing the bursting value fluctuation range of the explosion-proof valve. Description of the Drawings

[0032] Figure 1 is the first structural schematic diagram of the explosion-proof valve provided by the present invention;

[0033] Figure 2 is the second structural schematic diagram of the explosion-proof valve provided by the present invention;

[0034] Figure 3 is Figure 2 the cross-sectional view taken along the E-E direction in

[0035] Figure 4 It is a schematic structural diagram of the battery case provided by the present invention;

[0036] Figure 5 It is a schematic cross-sectional structural diagram of the battery case provided by the present invention;

[0037] Figure 6 It is a partially enlarged schematic cross-sectional structural diagram of the battery case (the explosion-proof valve is not shown) provided by the present invention;

[0038] Figure 7 is Figure 5 The partial enlarged view at position A in

[0039] In the figure:

[0040] D1, the first direction; D2, the second direction; D3, the third direction;

[0041] 1, explosion-proof valve; 11, valve piece; 111, the first straight section; 112, the second straight section; 113, the third straight section; 114, the first arc section; 115, the second arc section; 116, valve piece body; 117, convex edge; 2, housing; 21, open cavity; 3, cover plate; 31, installation groove; 32, exhaust hole. Specific embodiments

[0042] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the convenience of description, only parts related to the present invention rather than all structures are shown in the drawings.

[0043] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", "fixed" 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 or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0044] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the contact between the first and second features not being direct but through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly under and obliquely under the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0045] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0046] This embodiment provides an explosion-proof valve, which is applicable to battery cells in the shape of cylinders or squares, etc. The explosion-proof valve can increase the pressure relief area and disperse the stress on the notch, thereby reducing the probability that the notch reaches the bursting value prematurely and breaks, and playing a role in reducing the fluctuation range of the bursting value of the explosion-proof valve.

[0047] Specifically, as Figure 1 and Figure 2As shown in the figure, the explosion-proof valve 1 includes a valve disc 11, and the valve disc 11 is provided with a notch. The notch includes a first straight segment 111, a second straight segment 112, a third straight segment 113, a first arc segment 114 and a second arc segment 115. Among them, the first straight segment 111, the second straight segment 112 and the third straight segment 113 all extend along the first direction D1, and the first straight segment 111, the second straight segment 112 and the third straight segment 113 are sequentially arranged at intervals along the second direction D2. The first direction D1 is perpendicular to the second direction D2. The two ends of the first arc segment 114 are respectively connected to the same-side ends of the first straight segment 111 and the second straight segment 112, and the two ends of the second arc segment 115 are respectively connected to the other same-side ends of the first straight segment 111 and the third straight segment 113. That is, the two opposite sides of the valve disc 11 in the first direction D1 are the first side and the second side respectively. The ends of the first straight segment 111 and the second straight segment 112 facing the first side are respectively connected to the two ends of the first arc segment 114, and the ends of the first straight segment 111 and the third straight segment 113 facing the second side are respectively connected to the two ends of the second arc segment 115. Thus, the first straight segment 111, the second straight segment 112 and the third straight segment 113 are connected by the first arc segment 114 and the second arc segment 115. Compared with the O-shaped notch and the C-shaped notch, this notch design increases the pressure relief area, can disperse the stress on the notch, thereby reducing the probability that the notch reaches the bursting value prematurely and breaks, and plays a role in reducing the fluctuation range of the bursting value of the explosion-proof valve 1.

[0048] The notch structure provided in this embodiment is particularly applicable to small-sized explosion-proof valves 1. For example, the size of the valve disc 11 in the first direction D1 is f, and the size of the valve disc 11 in the second direction D2 is e. Among them, f ≤ 14.0 mm. Exemplarily, f can be 14.0 mm, 13.8 mm, 13.6 mm or 13.5 mm, etc., and e ≤ 9.4 mm. Exemplarily, e can be 9.4 mm, 9.2 mm, 9.0 mm or 8.8 mm, etc. For such small-sized explosion-proof valves 1 (especially when f ≤ 13.8 mm and e ≤ 9.2 mm), the surface area of the valve disc 11 is small. The notch design provided in this embodiment can increase the pressure relief area on the valve disc 11 with a limited area, reduce the probability that the notch on the small-sized valve disc 11 reaches the bursting value prematurely and breaks, and further reduce the fluctuation range of the bursting value of the small-sized explosion-proof valve 1.

[0049] It should be noted that the valve disc 11 in this embodiment is generally in a runway-shaped structure. The first direction D1 is parallel to the long axis of the runway-shaped valve disc 11, the second direction D2 is parallel to the short axis of the runway-shaped valve disc 11, and the third direction D3 is perpendicular to the surface of the runway-shaped valve disc 11. Of course, in other implementation schemes, the valve disc 11 can also be square or other shapes.

[0050] Further, the distance between the inner wall on the side of the first straight segment 111 away from the third straight segment 113 and the inner wall on the side of the third straight segment 113 away from the first straight segment 111 is a, where a ≤ 4.8 mm. Exemplarily, a can be 4.8 mm, 4.6 mm, 4.5 mm, or 4.3 mm, etc., and preferably a ≤ 4.6 mm; the sum of the lengths of the first straight segment 111, the second straight segment 112, the third straight segment 113, the arc length of the first arc segment 114, and the arc length of the second arc segment 115 is b, where b ≤ 8.9 mm. Exemplarily, b can be 8.9 mm, 8.7 mm, 8.5 mm, or 8.2 mm, etc., and preferably b ≤ 8.7 mm; the distance between the inner wall on the side of the second straight segment 112 facing the third straight segment 113 and the inner wall on the side of the third straight segment 113 facing the second straight segment 112 is c, where c ≤ 1.2 mm. Exemplarily, c can be 1.2 mm, 1.0 mm, 0.7 mm, or 0.6 mm, etc., and preferably c ≤ 1.0 mm; the distance between the inner wall on the side of the first straight segment 111 away from the second straight segment 112 and the inner wall on the side of the second straight segment 112 facing the first straight segment 111 is d, where d ≤ 3.6 mm. Exemplarily, d can be 3.6 mm, 3.4 mm, 3.2 mm, or 2.9 mm, etc., and preferably d ≤ 3.4 mm. In this embodiment, the maximum values of a, b, c, and d are restricted to make the notch distribution more concentrated on the basis of increasing the pressure relief area, so that the stress received by the notches is more concentrated, reducing the probability that the notches cannot break in time due to the overly dispersed stress received by the notches, and further reducing the fluctuation range of the bursting value of the explosion-proof valve 1.

[0051] In other embodiments, it can also be that three of a, b, c, and d satisfy the above parameter design. For example, in one embodiment, a ≤ 4.8 mm, b ≤ 8.9 mm, c ≤ 1.2 mm, and d > 3.6 mm; in another embodiment, a ≤ 4.8 mm, b ≤ 8.9 mm, c > 1.2 mm, and d ≤ 3.6 mm; in yet another embodiment, a > 4.8 mm, b ≤ 8.9 mm, c ≤ 1.2 mm, and d ≤ 3.6 mm. This design where three of a, b, c, and d satisfy the above parameter design and the remaining one does not can also achieve the effect of making the stress received by the notches more concentrated on the basis of increasing the pressure relief area. However, if only two or only one of a, b, c, and d satisfy the above parameter design, the stress received by the notches is too dispersed, and then there will be a problem that the notches cannot break in time. If it is necessary to ensure that the notches can break in time, the remaining thickness of the notches needs to be reduced, that is, reduced Figure 3However, an excessively small remaining thickness is likely to cause the problem of premature fracture of the notch, which instead increases the fluctuation range of the bursting value of the explosion-proof valve 1. Therefore, at least three of a, b, c, and d need to meet the above parameter design to make the stress received by the notch more concentrated on the basis of increasing the pressure relief area.

[0052] It should be noted that the technical solution provided in this embodiment can not only disperse the stress on the notch, but also concentrate the stress received by the notch, and these two technical effects are not contradictory. Specifically, by designing the shape of the notch, the pressure relief area of the explosion-proof valve 1 is increased to disperse the stress on the notch, thereby reducing the probability that the notch reaches the bursting value prematurely and fractures, that is, reducing the negative fluctuation range of the bursting value of the explosion-proof valve 1; by restricting the data parameters of the notch, the stress received by the notch is concentrated, thereby reducing the probability that the notch reaches the bursting value too late, that is, reducing the positive fluctuation range of the bursting value of the explosion-proof valve 1.

[0053] Optionally, as Figure 2 shown, a ≥ 3.9 mm. Exemplarily, a can be 3.9 mm, 4.1 mm, 4.3 mm, or 4.4 mm, etc., and it is preferably a ≥ 4.1 mm; b ≥ 8.0 mm. Exemplarily, b can be 8.0 mm, 8.2 mm, 8.5 mm, or 8.6 mm, etc., and it is preferably b ≥ 8.2 mm; c ≥ 0.3 mm. Exemplarily, c can be 0.3 mm, 0.5 mm, 0.6 mm, or 0.8 mm, etc., and it is preferably c ≥ 0.5 mm; d ≥ 2.7 mm. Exemplarily, d can be 2.7 mm, 2.9 mm, 3.0 mm, or 3.2 mm, etc., and it is preferably d ≥ 2.9 mm. In this embodiment, the minimum values of a, b, c, and d are restricted to ensure that there is enough spacing between the first straight segment 111, the second straight segment 112, the third straight segment 113, the first arc segment 114, and the second arc segment 115. Furthermore, when preparing the notch by stamping process in actual production, enough stamping space can be provided to avoid the problem that the valve piece 11 is deformed during stamping due to limited stamping space. If the valve piece 11 is deformed, the fluctuation range of the bursting value of the explosion-proof valve 1 will be increased, which is not conducive to improving the bursting accuracy of the explosion-proof valve 1.

[0054] Optionally, the axis of the first arc segment 114 is located on the side of the first arc segment 114 facing the second arc segment 115, and the axis of the second arc segment 115 is located on the side of the second arc segment 115 facing the first arc segment 114, so that the first straight segment 111, the second straight segment 112, the third straight segment 113, the first arc segment 114, and the second arc segment 115 are relatively dispersed, avoiding the problem that after the notch fractures due to the relatively concentrated distribution of the notch, the structural strength of some areas on the valve piece 11 is low and part of the valve piece 11 flies out.

[0055] Optionally, the distance between the inner wall of the second straight line segment 112 facing the first straight line segment 111 and the inner wall of the first straight line segment 111 facing the second straight line segment 112 is j, and the distance between the inner wall of the second straight line segment 112 facing the third straight line segment 113 and the inner wall of the third straight line segment 113 facing the second straight line segment 112 is c. Wherein, j is greater than c. This design can increase the arc lengths of the first arc segment 114 and the second arc segment 115, achieving the effect of further increasing the pressure relief area.

[0056] Optionally, the lengths of the first straight line segment 111, the second straight line segment 112, and the third straight line segment 113 are equal, that is, the dimensions of the first straight line segment 111, the second straight line segment 112, and the third straight line segment 113 in the first direction D1 are equal, making the overall structure of the notch more regular and facilitating production and processing at the same time.

[0057] Optionally, as Figures 1 to 3 shown, the valve plate 11 includes a valve plate body 116 and a convex edge 117. The notch is provided on the valve plate body 116. The convex edge 117 is connected to the side wall of the valve plate body 116. The convex edge 117 extends along the circumferential direction of the valve plate body 116 and is connected end to end. The thickness of the convex edge 117 is greater than the thickness of the valve plate body 116, that is, in the third direction D3, the dimension of the convex edge 117 is greater than the dimension of the valve plate body 116. The convex edge 117 is used to connect with the housing 2 or the cover plate 3 of the battery case. The thickness of the convex edge 117 is greater than the thickness of the valve plate body 116. Furthermore, the structural strength of the convex edge 117 is greater than the structural strength of the valve plate body 116. Connecting the convex edge 117 with the housing 2 (or the cover plate 3) of the battery case can improve the connection reliability between the explosion-proof valve 1 and the housing 2 (or the cover plate 3).

[0058] The explosion-proof valve 1 provided in this embodiment can not only reduce the negative fluctuation range of the bursting value but also reduce the positive fluctuation range of the bursting value, and finally control the fluctuation range of the bursting value of the explosion-proof valve 1 within a relatively small range. For example, the notch includes a first straight segment 111, a second straight segment 112, a third straight segment 113, a first arc segment 114, and a second arc segment 115. The first straight segment 111, the second straight segment 112, and the third straight segment 113 all extend along the first direction D1, and the first straight segment 111, the second straight segment 112, and the third straight segment 113 are sequentially arranged at intervals along the second direction D2. The first direction D1 is perpendicular to the second direction D2. The two ends of the first arc segment 114 are respectively connected to the same-side ends of the first straight segment 111 and the second straight segment 112, and the two ends of the second arc segment 115 are respectively connected to the other same-side ends of the first straight segment 111 and the third straight segment 113. Through the shape design of the notch, the effect of increasing the pressure relief area of the explosion-proof valve 1 is achieved, thereby reducing the probability that the notch reaches the bursting value prematurely and breaks, and reducing the negative fluctuation range of the bursting value of the explosion-proof valve 1; it is specified that a≤4.6mm, b≤8.7mm, c≤1.0mm, and d≤3.4mm. By restricting the spacing parameters of the notch, the effect of concentrating the stress on the notch is achieved, thereby reducing the probability that the notch reaches the bursting value too late, and reducing the positive fluctuation range of the bursting value of the explosion-proof valve 1. When the material of the valve plate 11 is aluminum and f≤13.8mm, e≤9.2mm, the bursting value of the explosion-proof valve 1 can be controlled within 0.9MPa±0.2MPa, making up for the defect that the bursting value fluctuation range of the small-size explosion-proof valve 1 in the current market is large.

[0059] This embodiment also provides a battery case, as Figure 4 and Figure 5As shown, the battery case includes a housing 2, a cover plate 3, and the above-mentioned explosion-proof valve 1. The housing 2 is provided with an open cavity 21. The cover plate 3 is covered on the opening of the open cavity 21. The explosion-proof valve 1 is arranged on the cover plate 3. The battery case adopts the above-mentioned explosion-proof valve 1. There is a notch on the valve plate 11 of the explosion-proof valve 1. The notch includes a first straight segment 111, a second straight segment 112, a third straight segment 113, a first arc segment 114, and a second arc segment 115. Among them, the first straight segment 111, the second straight segment 112, and the third straight segment 113 all extend along the first direction D1 and are sequentially arranged at intervals along the second direction D2 perpendicular to the first direction D1. The two ends of the first arc segment 114 are respectively connected to the same-side ends of the first straight segment 111 and the second straight segment 112. The two ends of the second arc segment 115 are respectively connected to the other same-side ends of the first straight segment 111 and the third straight segment 113. This notch design can increase the pressure relief area, and then disperse the stress on the notch, thereby reducing the probability that the notch reaches the bursting value prematurely and breaks, playing a role in reducing the fluctuation range of the bursting value of the explosion-proof valve 1. In another embodiment, the explosion-proof valve 1 is arranged on the housing 2, which can be determined according to actual application requirements.

[0060] In this embodiment, the housing 2 is cylindrical. In other embodiments, the housing 2 can also be a cuboid or other shapes.

[0061] Optionally, as Figure 6 and Figure 7 shown, the side of the cover plate 3 facing the open cavity 21 is provided with an installation groove 31. The bottom of the installation groove 31 is provided with an exhaust hole 32. The explosion-proof valve 1 is embedded and fixed in the installation groove 31. The valve plate body 116 is arranged opposite to the exhaust hole 32 to ensure that the surface of the cover plate 3 on the side away from the open cavity 21 is relatively flat.

[0062] Furthermore, the surface of the valve plate body 116 facing the open cavity 21, the surface of the convex edge 117 facing the open cavity 21, and the surface of the cover plate 3 facing the open cavity 21 are flush to avoid the valve plate body 116, the convex edge 117, or the edge of the installation groove 31 from bumping the battery cell in the open cavity 21.

[0063] This embodiment also provides a battery cell. The battery cell includes a battery cell (not shown in the figure) and the above-mentioned battery case. The battery cell is arranged in the open cavity 21. The battery cell adopts the above-mentioned battery case. The fluctuation range of the bursting value of the explosion-proof valve 1 on the battery case is small, thereby improving the use safety of the battery cell.

[0064] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Explosion-proof valve, characterized in that: It comprises a valve plate (11), wherein the valve plate (11) is provided with notches, and the notches include: A first straight line segment (111), a second straight line segment (112) and a third straight line segment (113), wherein the first straight line segment (111), the second straight line segment (112) and the third straight line segment (113) all extend along a first direction (D1), and the first straight line segment (111), the second straight line segment (112) and the third straight line segment (113) are sequentially arranged at intervals along a second direction (D2), and the first direction (D1) is perpendicular to the second direction (D2); A first arc segment (114) and a second arc segment (115), wherein two ends of the first arc segment (114) are respectively connected to the ends on the same side of the first straight segment (111) and the second straight segment (112), and two ends of the second arc segment (115) are respectively connected to the ends on the other side of the first straight segment (111) and the third straight segment (113).

2. The explosion-proof valve according to claim 1, characterized in that: The size of the valve plate (11) in the first direction (D1) is f, and the size of the valve plate (11) in the second direction (D2) is e, wherein f≤14.0 mm, and e≤9.4 mm.

3. The explosion-proof valve according to claim 2, characterized in that: The explosion-proof valve (1) satisfies at least three of the following: The distance between the inner wall of the first straight line segment (111) on the side facing away from the third straight line segment (113) and the inner wall of the third straight line segment (113) on the side facing away from the first straight line segment (111) is a, and a≤4.8 mm; The sum of the length of the first straight segment (111), the length of the second straight segment (112), the length of the third straight segment (113), the arc length of the first arc segment (114) and the arc length of the second arc segment (115) is b, b≤8.9 mm; The distance between the inner wall of the second straight line segment (112) facing the third straight line segment (113) and the inner wall of the third straight line segment (113) facing the second straight line segment (112) is c, c≤1.2 mm; The distance between the inner wall of the first straight line segment (111) on the side facing away from the second straight line segment (112) and the inner wall of the second straight line segment (112) on the side facing the first straight line segment (111) is d, and d≤3.6 mm.

4. The explosion-proof valve according to claim 2, characterized in that: The distance between the inner wall of the first straight line segment (111) on the side facing away from the third straight line segment (113) and the inner wall of the third straight line segment (113) on the side facing away from the first straight line segment (111) is a, and a≥3.9 mm; and / or the sum of the length of the first straight segment (111), the length of the second straight segment (112), the length of the third straight segment (113), the arc length of the first arc segment (114) and the arc length of the second arc segment (115) is b, and b≥8.0 mm; and / or, a distance between an inner wall of the second straight line segment (112) facing the third straight line segment (113) and an inner wall of the third straight line segment (113) facing the second straight line segment (112) is c, and c≥0.3 mm; And / or, a distance d between an inner wall of the first straight line segment (111) facing away from the second straight line segment (112) and an inner wall of the second straight line segment (112) facing the first straight line segment (111) is d, and d≥2.7 mm.

5. The explosion-proof valve according to claim 1, characterized in that: The axis of the first arc segment (114) is located on the side of the first arc segment (114) facing the second arc segment (115), and the axis of the second arc segment (115) is located on the side of the second arc segment (115) facing the first arc segment (114).

6. The explosion-proof valve according to claim 1, characterized in that: The first straight line segment (111), the second straight line segment (112), and the third straight line segment (113) are of equal length.

7. The explosion-proof valve according to claim 1, characterized in that: The spacing between the inner wall of the second straight line segment (112) facing the first straight line segment (111) and the inner wall of the first straight line segment (111) facing the second straight line segment (112) is j, and the spacing between the inner wall of the second straight line segment (112) facing the third straight line segment (113) and the inner wall of the third straight line segment (113) facing the second straight line segment (112) is c, where j is greater than c.

8. The explosion-proof valve according to claim 1, characterized in that: The valve sheet (11) comprises a valve sheet body (116) and a convex edge (117), wherein the notch is arranged on the valve sheet body (116), the convex edge (117) is connected to the side wall of the valve sheet body (116), the convex edge (117) extends along the circumference of the valve sheet body (116) and is connected end to end, the thickness of the convex edge (117) is greater than the thickness of the valve sheet body (116), and the convex edge (117) is used to be connected to the shell (2) or the cover plate (3) of the battery shell.

9. A battery case, characterized in that: The invention comprises a shell (2), a cover plate (3) and an explosion-proof valve (1) as claimed in any one of claims 1 to 8, wherein the shell (2) is provided with an opening cavity (21), the cover plate (3) is arranged at the opening of the opening cavity (21), and the explosion-proof valve (1) is arranged on the shell (2) or the cover plate (3).

10. A battery cell, characterized in that: It comprises a battery cell and the battery shell according to claim 9, wherein the battery cell is arranged in the open cavity (21).

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