Explosion-proof valve, battery shell and battery monomer

Abstract

The utility model belongs to the technical field of batteries, and discloses an explosion-proof valve, a battery shell and a battery monomer, the explosion-proof valve comprises a valve plate, a nick is arranged on the valve plate, and the nick comprises a first straight line section, a second straight line section, a third straight line 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] This utility model relates to the field of battery technology, and in particular to an explosion-proof valve, a battery casing, and a battery cell. Background Technology

[0002] To prevent explosions in case of malfunctions, explosion-proof valves are typically added to the battery structure. These valves are usually welded to the battery casing or cover plate and can withstand a certain amount of pressure. When the pressure inside the battery casing exceeds the pressure it can withstand (i.e., the burst value of the explosion-proof valve), the grooves on the explosion-proof valve will break, thus releasing a large amount of gas before the battery explodes, thereby turning the explosion into smoke and reducing the danger level.

[0003] Currently, explosion-proof valves used in cylindrical batteries are relatively small in size, so only small-area explosion-proof valves can be scored. Common scoring methods include O-type scoring and C-type scoring. These two types of scoring have small pressure relief areas, resulting in more concentrated stress on the scoring. The scoring is prone to reaching the burst value too early and breaking, which increases the fluctuation range of the explosion-proof valve's burst value.

[0004] Therefore, there is an urgent need to propose an explosion-proof valve, battery casing, and battery cell to solve the above-mentioned technical problems. Utility Model Content

[0005] The first objective of this invention is to provide an explosion-proof valve that can increase the pressure relief area and disperse the stress on the groove, thereby reducing the probability that the groove will reach the burst value and break prematurely, and thus reducing the fluctuation range of the burst value of the explosion-proof valve.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] Explosion-proof valve, including valve plate, the valve plate having grooves, the grooves including:

[0008] The first straight line segment, the second straight line segment, and the third straight line segment all extend along the first direction, and the first straight line segment, the second straight line segment, and the third straight line segment are arranged alternately along the second direction, with the first direction being perpendicular to the second direction.

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

[0010] Optionally, the valve plate has a dimension f in the first direction and a dimension e in the second direction, where f ≤ 14.0 mm and e ≤ 9.4 mm.

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

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

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

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

[0015] The distance between the inner wall of the first straight segment away from the second straight segment and the inner wall of the second straight segment facing the first straight segment is d, where d≤3.6mm.

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

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

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

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

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

[0021] Optionally, the lengths of the first, second, and third line segments are equal.

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

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

[0024] The second objective of this invention is to provide a battery casing with a small fluctuation range in the burst value of the explosion-proof valve.

[0025] To achieve this objective, the present invention adopts the following technical solution:

[0026] The battery casing includes a housing, a cover plate, and the aforementioned explosion-proof valve. The housing has an opening, the cover plate covers the opening of the opening, and the explosion-proof valve is installed on the housing or the cover plate.

[0027] The third objective of this invention is to provide a battery cell whose explosion-proof valve has a small fluctuation range in burst value.

[0028] To achieve this objective, the present invention adopts the following technical solution:

[0029] A battery cell includes the battery cell and the aforementioned battery casing, with the battery cell disposed inside the opening.

[0030] The beneficial effects of this utility model are:

[0031] The explosion-proof valve provided by this utility model has a notch comprising a first straight segment, a second straight segment, a third straight segment, a first arc segment, and a second arc segment. The first, second, and third straight segments extend along a first direction and are sequentially spaced 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 and second straight segments. The two ends of the second arc segment are respectively connected to the other same-side ends of the first and third straight segments. In other words, the first, second, and third straight segments are connected by the first and second arc segments. Compared to O-type and C-type notches, this notch design increases the pressure relief area and can disperse the stress on the notch, thereby reducing the probability of the notch reaching its burst value prematurely and breaking. This reduces the fluctuation range of the explosion-proof valve's burst value. Attached Figure Description

[0032] Figure 1 This is a first structural schematic diagram of the explosion-proof valve provided by this utility model;

[0033] Figure 2 This is a schematic diagram of the second structure of the explosion-proof valve provided by this utility model;

[0034] Figure 3 yes Figure 2 Sectional view along the EE direction;

[0035] Figure 4 This is a schematic diagram of the structure of the battery casing provided by this utility model;

[0036] Figure 5 This is a cross-sectional structural diagram of the battery casing provided by this utility model;

[0037] Figure 6 This is a partial enlarged cross-sectional structural diagram of the battery casing (explosion-proof valve not shown) provided by this utility model;

[0038] Figure 7 yes Figure 5 Enlarged view of a portion of point A in the middle.

[0039] In the picture:

[0040] D1, First Direction; D2, Second Direction; D3, Third Direction;

[0041] 1. Explosion-proof valve; 11. Valve plate; 111. First straight segment; 112. Second straight segment; 113. Third straight segment; 114. First arc segment; 115. Second arc segment; 116. Valve plate body; 117. Protruding edge; 2. Housing; 21. Opening cavity; 3. Cover plate; 31. Mounting groove; 32. Vent hole. Detailed Implementation

[0042] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0043] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0044] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0045] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. 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 suitable for battery cells of cylindrical or square shapes. The explosion-proof valve can increase the pressure relief area and disperse the stress on the groove, thereby reducing the probability that the groove will reach the burst value and break prematurely, and playing a role in reducing the fluctuation range of the explosion-proof valve's burst value.

[0047] Specifically, such as Figure 1 and Figure 2As shown, the explosion-proof valve 1 includes a valve plate 11 with grooves. The grooves include 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 a first direction D1, and are arranged alternately along a 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. The two ends of the second arc segment 115 are respectively connected to the other side of the first straight segment 111 and the third straight segment 113. At the ends, that is, the two opposite sides of the valve plate 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 through the first arc segment 114 and the second arc segment 115. Compared with O-type and C-type notches, this notch design increases the pressure relief area and can disperse the stress on the notch, thereby reducing the probability of the notch reaching the burst value and breaking prematurely, and playing a role in reducing the fluctuation range of the burst value of the explosion-proof valve 1.

[0048] The notched structure provided in this embodiment is particularly suitable for small-sized explosion-proof valves 1. For example, the valve plate 11 has a dimension f in the first direction D1 and a dimension e in the second direction D2, where f ≤ 14.0 mm (e can be 14.0 mm, 13.8 mm, 13.6 mm, or 13.5 mm, etc.) and e ≤ 9.4 mm (e can be 9.4 mm, 9.2 mm, 9.0 mm, or 8.8 mm, etc.). For this type of small-sized explosion-proof valve 1 (especially when f ≤ 13.8 mm and e ≤ 9.2 mm), the surface area of ​​its valve plate 11 is small. The notched design provided in this embodiment can increase the pressure relief area on the valve plate 11 with a limited area, reducing the probability that the notched area on the small-sized valve plate 11 will reach the burst value and break prematurely, thereby reducing the fluctuation range of the burst value of the small-sized explosion-proof valve 1.

[0049] It should be noted that the valve plate 11 in this embodiment is roughly racetrack-shaped, with the first direction D1 parallel to the major axis of the racetrack-shaped valve plate 11, the second direction D2 parallel to the minor axis of the racetrack-shaped valve plate 11, and the third direction D3 perpendicular to the surface of the racetrack-shaped valve plate 11. Of course, in other embodiments, the valve plate 11 can also be square or other shapes.

[0050] Further, the distance between the inner wall of the first straight segment 111 facing away from the third straight segment 113 and the inner wall of the third straight segment 113 facing away from the first straight segment 111 is 'a', where 'a' ≤ 4.8 mm. For example, 'a' can be 4.8 mm, 4.6 mm, 4.5 mm, or 4.3 mm, etc., with 'a' ≤ 4.6 mm being preferred. 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. For example, 'b' can be 8.9 mm, 8.7 mm, 8.5 mm, or 8.2 mm, etc., with 'b' ≤ 8.7 mm being preferred. The inner wall of the second straight segment 112 facing towards the third straight segment 113 and the inner wall of the third straight segment 113 facing towards the second straight segment 112 are also mentioned. The spacing between them is c, where c ≤ 1.2 mm. For example, c can be 1.2 mm, 1.0 mm, 0.7 mm, or 0.6 mm, etc., with c ≤ 1.0 mm being preferred. The spacing between the inner wall of the first straight segment 111 away from the second straight segment 112 and the inner wall of the second straight segment 112 facing the first straight segment 111 is d, where d ≤ 3.6 mm. For example, d can be 3.6 mm, 3.4 mm, 3.2 mm, or 2.9 mm, etc., with d ≤ 3.4 mm being preferred. In this embodiment, the maximum values ​​of a, b, c, and d are limited to make the distribution of the grooves more concentrated while increasing the pressure relief area. This makes the stress on the grooves more concentrated, reducing the probability that the grooves cannot break in time due to the excessive dispersion of stress on them, and further reducing the fluctuation range of the explosion value of the explosion-proof valve 1.

[0051] In other implementations, three of a, b, c, and d may satisfy the above-mentioned parameter design. For example, in one implementation, a ≤ 4.8 mm, b ≤ 8.9 mm, c ≤ 1.2 mm, and d > 3.6 mm; in another implementation, a ≤ 4.8 mm, b ≤ 8.9 mm, c > 1.2 mm, and d ≤ 3.6 mm; and in yet another implementation, a > 4.8 mm, b ≤ 8.9 mm, c ≤ 1.2 mm, and d ≤ 3.6 mm. In this case, three of a, b, c, and d satisfy the above-mentioned parameter design, while the remaining one does not, which can still achieve the effect of increasing the stress concentration on the groove while increasing the pressure relief area. However, if only two or only one of a, b, c, and d satisfies the above-mentioned parameter design, the stress on the groove will be too dispersed, leading to the problem that the groove cannot break in time. To ensure that the groove can break in time, it is necessary to reduce the residual thickness of the groove, i.e., reduce... Figure 3However, if the residual thickness is too small, it can easily cause the groove to break prematurely, which will increase the fluctuation range of the explosion value of the explosion-proof valve 1. Therefore, at least three of a, b, c and d must meet the above parameter design to make the stress on the groove 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 both disperse the stress on the groove and concentrate the stress on the groove, and these two technical effects are not contradictory. Specifically, by designing the shape of the groove to increase the pressure relief area of ​​the explosion-proof valve 1, the stress on the groove is dispersed, thereby reducing the probability that the groove will reach the burst value and break prematurely, that is, reducing the negative fluctuation range of the burst value of the explosion-proof valve 1; by limiting the data parameters of the groove, the stress on the groove is concentrated, thereby reducing the probability that the groove will reach the burst value too late, that is, reducing the positive fluctuation range of the burst value of the explosion-proof valve 1.

[0053] Optionally, such as Figure 2 As shown, a ≥ 3.9 mm, and for example, a can be 3.9 mm, 4.1 mm, 4.3 mm, or 4.4 mm, etc., with a ≥ 4.1 mm being preferred; b ≥ 8.0 mm, and for example, b can be 8.0 mm, 8.2 mm, 8.5 mm, or 8.6 mm, etc., with b ≥ 8.2 mm being preferred; c ≥ 0.3 mm, and for example, c can be 0.3 mm, 0.5 mm, 0.6 mm, or 0.8 mm, etc., with c ≥ 0.5 mm being preferred; d ≥ 2.7 mm, and for example, d can be 2.7 mm, 2.9 mm, or 3. The values ​​are 0mm or 3.2mm, with d ≥ 2.9mm being preferred. In this embodiment, the minimum values ​​of a, b, c, and d are limited to ensure 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 have sufficient spacing between each other. This provides sufficient stamping space when the stamping process is used to prepare the grooves in actual production, avoiding the problem of valve plate 11 deforming during stamping due to limited stamping space. If valve plate 11 deforms, it will increase the fluctuation range of the burst value of the explosion-proof valve 1, which is not conducive to improving the burst 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 more dispersed, avoiding the problem that after the scratches are broken due to the concentrated distribution of scratches, the structural strength of a part of the valve plate 11 is low, and thus some valve plates 11 are blown away.

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

[0056] Optionally, the lengths of the first straight segment 111, the second straight segment 112, and the third straight segment 113 are equal, that is, the dimensions of the first straight segment 111, the second straight segment 112, and the third straight segment 113 in the first direction D1 are equal, which makes the overall structure of the groove more regular and facilitates production and processing.

[0057] Optionally, such as Figures 1 to 3 As shown, the valve plate 11 includes a valve plate body 116 and a protruding edge 117. The groove is set on the valve plate body 116, and the protruding edge 117 is connected to the side wall of the valve plate body 116. The protruding edge 117 extends along the circumference of the valve plate body 116 and is connected end to end. The thickness of the protruding edge 117 is greater than the thickness of the valve plate body 116. That is, in the third direction D3, the size of the protruding edge 117 is greater than the size of the valve plate body 116. The protruding edge 117 is used to connect with the housing 2 or cover plate 3 of the battery case. The thickness of the protruding edge 117 is greater than the thickness of the valve plate body 116, and thus the structural strength of the protruding edge 117 is greater than the structural strength of the valve plate body 116. The connection between the protruding edge 117 and the housing 2 (or cover plate 3) of the battery case can improve the reliability of the connection between the explosion-proof valve 1 and the housing 2 (or cover plate 3).

[0058] The explosion-proof valve 1 provided in this embodiment can reduce both the negative and positive fluctuation range of the explosion value, ultimately controlling the fluctuation range of the explosion value of the explosion-proof valve 1 to a small range. For example, the groove 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 arranged alternately 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 design of the shape of the groove, the desired effect is achieved. To increase the pressure relief area of ​​the explosion-proof valve 1, the probability of the groove reaching the burst value and breaking prematurely is reduced, thus decreasing the negative fluctuation range of the burst value of the explosion-proof valve 1. By limiting a≤4.6mm, b≤8.7mm, c≤1.0mm and d≤3.4mm, the stress on the groove is concentrated, thus reducing the probability of the groove reaching the burst value late and decreasing the positive fluctuation range of the burst value of the explosion-proof valve 1. When the valve plate 11 is made of aluminum and f≤13.8mm and e≤9.2mm, the burst value of the explosion-proof valve 1 can be controlled at 0.9MPa±0.2MPa, which makes up for the defect of large fluctuation range of burst value of small-sized explosion-proof valves 1 in the current market.

[0059] This embodiment also provides a battery casing, such as Figure 4 and Figure 5As shown, the battery casing includes a housing 2, a cover plate 3, and the aforementioned explosion-proof valve 1. The housing 2 has an opening 21, and the cover plate 3 covers the opening of the opening 21. The explosion-proof valve 1 is mounted on the cover plate 3. The battery casing uses the aforementioned explosion-proof valve 1. The valve plate 11 of the explosion-proof valve 1 has grooves, including 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 are all along the first arc segment 114. Extending in direction D1 and spaced sequentially along a second direction D2 perpendicular to the first direction D1, the two ends of the first arc-shaped segment 114 are respectively connected to the ends of the first straight segment 111 and the second straight segment 112 on the same side. The two ends of the second arc-shaped segment 115 are respectively connected to the ends of the first straight segment 111 and the third straight segment 113 on the other side. This grooved design increases the pressure relief area, thereby dispersing the stress on the groove and reducing the probability of the groove reaching the burst value prematurely and breaking, thus reducing the fluctuation range of the burst value of the explosion-proof valve 1. In another embodiment, the explosion-proof valve 1 is mounted on the housing 2, depending on the actual application requirements.

[0060] In this embodiment, the shell 2 is cylindrical. In other embodiments, the shell 2 may also be cuboid or other shapes.

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

[0062] Furthermore, the surfaces of the valve body 116 facing the opening 21, the protrusion 117 facing the opening 21, and the cover plate 3 facing the opening 21 are flush to prevent the valve body 116, the protrusion 117, or the edge of the mounting groove 31 from bumping into the battery cell inside the opening 21.

[0063] This embodiment also provides a battery cell, which includes a battery cell (not shown in the figure) and the battery casing described above. The battery cell is disposed in the opening 21. The battery cell uses the battery casing described above. The explosion-proof valve 1 on the battery casing has a small fluctuation range in burst value, thereby improving the safety of the battery cell in use.

[0064] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An explosion-proof valve, characterized in that, Includes a valve plate (11), the valve plate (11) having grooves, the grooves including: The first straight line segment (111), the second straight line segment (112), and the third straight line segment (113) are all extended along a first direction (D1), and are arranged at intervals along a second direction (D2). The first direction (D1) is perpendicular to the second direction (D2). The first arc segment (114) and the second arc segment (115) are respectively connected at both ends of the first straight segment (111) and the second straight segment (112) on the same side, and at both ends of the second arc segment (115) are respectively connected at the other ends of the first straight segment (111) and the third straight segment (113) on the same side.

2. The explosion-proof valve according to claim 1, characterized in that, The valve plate (11) has a dimension f in the first direction (D1) and a dimension e in the second direction (D2), 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) shall satisfy at least three of the following conditions: The distance between the inner wall of the first straight segment (111) on the side away from the third straight segment (113) and the inner wall of the third straight segment (113) on the side away from the first straight segment (111) is a, where a≤4.8mm; 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, where b ≤ 8.9 mm; The distance between the inner wall of the second straight segment (112) facing the third straight segment (113) and the inner wall of the third straight segment (113) facing the second straight segment (112) is c, where c ≤ 1.2 mm; The distance between the inner wall of the first straight segment (111) on the side away from the second straight segment (112) and the inner wall of the second straight segment (112) on the side facing the first straight segment (111) is d, where d≤3.6mm.

4. The explosion-proof valve according to claim 2, characterized in that, The distance between the inner wall of the first straight segment (111) on the side away from the third straight segment (113) and the inner wall of the third straight segment (113) on the side away from the first straight segment (111) is a, where 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, where b ≥ 8.0 mm; And / or, the distance between the inner wall of the second straight segment (112) facing the third straight segment (113) and the inner wall of the third straight segment (113) facing the second straight segment (112) is c, c≥0.3mm; And / or, the distance between the inner wall of the first straight segment (111) on the side away from the second straight segment (112) and the inner wall of the second straight segment (112) on the side facing the first straight segment (111) is d, where 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 lengths of the first straight line segment (111), the second straight line segment (112), and the third straight line segment (113) are equal.

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

8. The explosion-proof valve according to claim 1, characterized in that, The valve plate (11) includes a valve plate body (116) and a protruding edge (117). The groove is provided on the valve plate body (116). The protruding edge (117) is connected to the side wall of the valve plate body (116). The protruding edge (117) extends circumferentially along the valve plate body (116) and is connected end to end. The thickness of the protruding edge (117) is greater than the thickness of the valve plate body (116). The protruding edge (117) is used to connect with the housing (2) or cover plate (3) of the battery case.

9. A battery casing, characterized in that, The device includes a housing (2), a cover plate (3), and an explosion-proof valve (1) as described in any one of claims 1-8. The housing (2) is provided with an opening (21), and the cover plate (3) covers the opening of the opening (21). The explosion-proof valve (1) is disposed on the housing (2) or the cover plate (3).

10. A single battery cell, characterized in that, It includes a battery cell and a battery casing as described in claim 9, wherein the battery cell is disposed within the opening (21).

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