Explosion-proof valve, battery, battery module, battery pack, and vehicle

Abstract

The vehicle has a battery pack. The battery pack includes a battery or a battery module. The battery module includes a battery. Each battery includes a battery case and an anti-explosion valve. The anti-explosion valve is disposed in the battery case. The anti-explosion valve is provided with a notched groove. The anti-explosion valve includes an opening area. In a depth direction of the notched groove, a shape of an orthogonal projection of the opening area is non-circular. An outer edge of the orthogonal projection of the opening area is a preset opening boundary, an area of ​​the orthogonal projection of the opening area is S1, and an area of ​​the orthogonal projection of the anti-explosion valve is S, where S1 and S satisfy S1 / S≧0.3, and both S1 and S are expressed in mm 2 It is.

Description

[Technical field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This disclosure claims priority to and the benefit of Chinese Patent Application No. 202221128849.3, entitled “BATTERY, BATTERY MODULE, BATTERY PACK AND VEHICLE,” filed by BYD Company Limited on May 12, 2022, which is incorporated herein by reference in its entirety.

[0002] The present disclosure relates to the technical field of batteries, and in particular to an anti-explosion valve, a battery, a battery module, a battery pack, and a vehicle. [Background technology]

[0003] Conventionally, the opening area of ​​the explosion-proof valve that is configured to open when pressure is released is generally designed to be circular. However, the circular opening area is easily limited by the setting position, and the area occupied by the opening area (i.e., the opening range) of the explosion-proof valve is relatively small, which is easily affected by the wire harness around the explosion-proof valve when pressure is released, and the pressure cannot be released immediately, which increases the potential safety hazard. Summary of the Invention [Means for solving the problem]

[0004] The present disclosure aims to solve at least one of the existing technical problems in the prior art. Therefore, the present disclosure aims to provide an explosion-proof valve, which can reduce the damage of the opening area caused by internal stress or external force, and improve the reliability of the explosion-proof valve and the safety of the battery use.

[0005] The present disclosure further discloses a battery including a battery case and the aforementioned anti-explosion valve.

[0006] The present disclosure further discloses a battery module including the aforementioned battery.

[0007] The present disclosure further discloses a battery pack including the aforementioned battery or the aforementioned battery module.

[0008] The present disclosure further discloses a vehicle including the aforementioned battery pack.

[0009] According to an embodiment of the explosion-proof valve in the first aspect of the present disclosure, the explosion-proof valve is provided with a notched groove. The explosion-proof valve includes an opening area. The opening area is an area surrounded by a preset opening boundary. In the depth direction of the notched groove, the shape of the orthogonal projection of the opening area is non-circular, the outer edge of the orthogonal projection of the opening area is the preset opening boundary, the area of ​​the orthogonal projection of the opening area is S1, and the area of ​​the orthogonal projection of the explosion-proof valve is S, where S1 and S satisfy S1 / S≧0.3, and both S1 and S are expressed in mm 2 It is.

[0010] According to the explosion-proof valve in the embodiment of the present disclosure, the shape of the explosion-proof valve can be adjusted to apply the explosion-proof valve to battery cases of various shapes, thereby expanding the scope of application of the explosion-proof valve. Meanwhile, the area ratio of the orthogonal projection area S1 of the opening area to the orthogonal projection area S of the explosion-proof valve can be adjusted to increase the area ratio of the opening area in the explosion-proof valve, thereby ensuring the opening area of ​​the explosion-proof valve and improving the working efficiency of the explosion-proof valve, and then the internal pressure can be released in a timely manner after the battery is damaged, thereby improving the protection of the battery and reducing the usage cost of the battery.

[0011] In some examples, S1 and S further satisfy S1 / S≦0.95.

[0012] In some examples, S1 and S are each 80 mm 2 ≦S1≦1600mm 2 , and 178.5mm 2 ≦S≦5212.5mm 2 Meet the following.

[0013] In some examples, the notch groove includes two arc-shaped first notches arranged opposite to each other, a straight second notch, and two straight third notches spaced apart from each other. The second notches and the third notches are arranged in parallel. The two ends of the second notches are respectively connected to the two first notches. Each of the third notches is connected to a corresponding first notch. In the depth direction of the notch groove, two free ends of the outer edge of the orthogonal projection of the notch groove are connected to form a connecting line, and the connecting line and the outer edge of the orthogonal projection of the notch groove together form a preset opening boundary.

[0014] In some examples, the notch groove includes two arcuate fourth notches arranged opposite to each other and two linear fifth notches arranged parallel to each other. The two ends of each of the fifth notches are respectively connected to the two fourth notches, and the two fifth notches and the two fourth notches form a closed ring structure. In the depth direction of the notch groove, the outer edge of the orthogonal projection of the notch groove forms a preset opening boundary.

[0015] In some examples, the notch groove includes a linear sixth notch and four linear seventh notches. Two ends of the sixth notch are respectively connected to two seventh notches, and two of the seventh notches are connected at a preset included angle. In the depth direction of the notch groove, a first circular arc is defined between free ends of the orthogonal projections of the two seventh notches located at the same end of the sixth notch. The first circular arc has the apex of the preset included angle as the center of the circle. A first straight line is defined between free ends of the orthogonal projections of the two seventh notches located at the same side of the sixth notch. The two first circular arcs and the two first straight lines together form a preset opening boundary.

[0016] In some examples, in the depth direction of the notch groove, the outer contour of the orthogonal projection of the explosion-proof valve includes two second straight lines arranged in parallel and two second arcs arranged opposite to each other. The two ends of each of the two second straight lines are respectively connected to the two second arcs. The length of the second straight lines is L, the distance between the two second straight lines is 2R, and S, L, and R are expressed as S=πR. 2 Meet +2RL, 10mm≦L≦65mm, and 5mm≦R≦25mm.

[0017] In some instances, in the depth direction of the notched groove, the thickness of the opening area is less than the thickness of the remainder of the explosion proof valve.

[0018] In some examples, the thickness of the opening area in the depth direction of the notched groove is H1, and H1 satisfies 0.1 mm≦H1≦0.3 mm.

[0019] In some examples, in the depth direction of the notched groove, the orthogonal projection of the opening area has an oval, an ellipse, or a polygonal shape.

[0020] In some examples, the explosion-proof valve further includes a connecting portion, a buffer portion, and a support portion. The connecting portion is connected to an outer periphery of the support portion. The support portion and the connecting portion are spaced apart along a thickness direction of the support portion. The buffer portion is connected between the connecting portion and the support portion. The opening area is disposed in the support portion.

[0021] In some examples, a groove is formed in the support and a notched groove is formed in a bottom wall of the groove.

[0022] In some examples, in the depth direction of the notched groove, the outer edge of the orthogonal projection of the groove and the outer edge of the orthogonal projection of the notched groove have an overlap area.

[0023] In some examples, in the depth direction of the notched groove, the thickness of the opening area corresponding to the notched groove is H2, and H2 satisfies 0.02 mm≦H2≦0.2 mm.

[0024] In some examples, the thickness of the support portion in the depth direction of the notched groove is H3, and H2 and H3 satisfy H2:H3=0.1 to 1.

[0025] In some examples, in the depth direction of the notched groove, the thickness of the support portion is H3, the thickness of the connection portion is H4, and H3 and H4 satisfy H3:H4=0.25 to 1.

[0026] In some examples, in the depth direction of the notched groove, the height of the explosion-proof valve is H5, and in the thickness direction of the buffer section, the wall thickness of the buffer section is D1, where H5 and D1 respectively satisfy 0.5 mm≦H5≦1.5 mm, and 0.2 mm≦D1≦0.8 mm.

[0027] In some examples, in the thickness direction of the buffer portion, the width of the support portion is D2, and in the depth direction of the notch groove, the thickness of the support portion is H3, where D2 and H3 satisfy 0.2 mm≦D2≦2 mm and 0.2 mm≦H3≦0.8 mm, respectively.

[0028] In some examples, in the thickness direction of the buffer portion, the width of the connection portion is D3, and in the depth direction of the notch groove, the thickness of the connection portion is H4, where D3 and H4 satisfy 1 mm≦D3≦5 mm and 0.2 mm≦H4≦0.8 mm, respectively.

[0029] A battery according to an embodiment of the second aspect of the present disclosure includes a battery case and an anti-explosion valve according to the embodiment of the first aspect of the present disclosure. The anti-explosion valve is disposed in the battery case.

[0030] A battery pack according to an embodiment of the third aspect of the present disclosure includes a battery module according to the embodiment of the above-mentioned second aspect of the present disclosure.

[0031] A battery pack according to an embodiment of the fourth aspect of the present disclosure includes a battery according to the embodiment of the second aspect of the present disclosure, or a battery module according to the embodiment of the third aspect of the present disclosure.

[0032] A vehicle according to an embodiment of the fifth aspect of the present disclosure includes a battery pack according to the embodiment of the aforementioned fourth aspect of the present disclosure.

[0033] Additional aspects and advantages of the disclosure will be set forth in the description which follows, and in some cases will be apparent from the description, or may be learned by practice of the disclosure.

[0034] The foregoing and / or additional aspects and advantages of the present disclosure will become apparent and understandable from the following description of examples which proceeds with reference to the accompanying drawings. [Brief description of the drawings]

[0035] [Figure 1] FIG. 1 is a schematic diagram of a battery according to one embodiment of the present disclosure. [Diagram 2] 1 is a schematic diagram of an explosion-proof valve according to one embodiment of the present disclosure. [Diagram 3] 1 is a cross-sectional view of an explosion-proof valve according to one embodiment of the present disclosure. [Figure 4] FIG. 1 is a schematic diagram of a C-shaped notched groove according to one embodiment of the present disclosure. [Diagram 5] FIG. 13 is a schematic diagram of an X-shaped notched groove according to one embodiment of the present disclosure. [Figure 6] FIG. 1 is a schematic diagram of a Y-shaped notched groove according to one embodiment of the present disclosure. [Figure 7] FIG. 13 is a schematic diagram of a double Y-shaped notched groove according to one embodiment of the present disclosure. [Figure 8] FIG. 2 is a schematic diagram of a comparison of pressure release rate between a battery according to Example 1 of the present disclosure and Comparative Example 1 of the prior art. [Figure 9] FIG. 11 is a schematic diagram of a comparison of pressure release rate between a battery according to Example 2 of the present disclosure and Comparative Example 2 of the prior art. [Figure 10] FIG. 11 is a schematic diagram of a comparison of pressure release rate between a battery according to Example 3 of the present disclosure and Comparative Example 3 of the prior art. [Figure 11] FIG. 11 is a schematic diagram of a comparison of pressure release rate between a battery according to Example 4 of the present disclosure and Comparative Example 4 of the prior art. [Figure 12]FIG. 11 is a schematic diagram of a comparison of pressure release rate between a battery according to Example 5 of the present disclosure and Comparative Example 5 of the prior art. [Figure 13] FIG. 11 is a schematic diagram of a comparison of pressure release rate between a battery according to Example 6 of the present disclosure and Comparative Example 6 of the prior art. [Figure 14] FIG. 13 is a schematic diagram of a preset opening boundary of a C-shaped notch groove according to one embodiment of the present disclosure. [Figure 15] 1 is a schematic diagram of a vehicle according to one embodiment of the present disclosure. [Explanation of symbols]

[0036] 100 Battery, 10 Battery case, 20 explosion-proof valve, 21 connection part, 22 support part, 221 groove, 23 buffer part, 24 opening area, 241 preset opening boundary, 25 notch groove, 251 first notch part, 252 second notch part, 253 third notch part, 254 fourth notch part, 255 fifth notch part, 256 sixth notch part, 257 seventh notch part, 258 first straight line, 259 first circular arc, 260 eighth notch part, 261 ninth notch part, 262 tenth notch part, 263 connecting line, 27 second straight line, 28 second arc, 200 battery modules, 300 battery packs, and 400 vehicles. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0037] Although the embodiment of the present disclosure will be described in detail below, the embodiment described with reference to the attached drawings is merely an example. An explosion-proof valve 20 according to the embodiment of the present disclosure will be described below with reference to Figs.

[0038] According to an embodiment of the explosion-proof valve 20 in the first aspect of the present disclosure, the explosion-proof valve 20 is provided with a notched groove 25. The explosion-proof valve 20 includes an opening area 24. In the depth direction of the notched groove 25 (i.e., the direction from the groove opening to the groove bottom of the notched groove 25), the shape of the orthogonal projection of the opening area 24 is non-circular, and the outer edge of the orthogonal projection of the opening area 24 is a preset opening boundary 241. The area of ​​the orthogonal projection of the opening area 24 is S1, and the area of ​​the orthogonal projection of the explosion-proof valve 20 is S, where S1 and S satisfy S1 / S≧0.3, and both S1 and S are expressed in mm 2 As shown in Fig. 3, the depth direction of the notched groove 25 is from bottom to top.

[0039] The opening area 24 may be an area that is ensured when the explosion-proof valve 20 is designed and configured to release pressure. When the explosion-proof valve 20 is configured for the battery 100 and the internal pressure of the battery 100 becomes high and needs to be released, the internal pressure of the battery 100 can be released from the opening area 24. The opening area of ​​the opening area 24 may be ensured to be appropriate by defining the ratio of S1 to S to realize the pressure release of the battery 100, thereby ensuring the pressure release capacity of the explosion-proof valve 20, improving the use performance of the explosion-proof valve 20, and improving the use safety of the battery 100.

[0040] According to the explosion-proof valve 20 in one embodiment of the present disclosure, the shape of the explosion-proof valve 20 can be adjusted to apply the explosion-proof valve 20 to battery cases 10 of various shapes, thereby expanding the application range of the explosion-proof valve 20. Meanwhile, by adjusting the area ratio of the orthogonal projection area S1 of the opening area 24 to the orthogonal projection area S of the explosion-proof valve 20, the ratio of the area of ​​the opening area 24 in the explosion-proof valve 20 is increased, so that the opening area of ​​the explosion-proof valve 20 is secured, the working efficiency of the explosion-proof valve 20 is improved, and then the internal pressure is released in a timely manner after the battery 100 is damaged, the protection of the battery 100 is enhanced, and the usage cost of the battery 100 is reduced.

[0041] In some embodiments, S1 and S are S1 / S≦0.95, 80 mm 2≦S1≦1600mm 2 , 178.5mm 2 ≦S≦5212.5mm 2 Further satisfy. When the total area S of the explosion-proof valve 20 is constant, the opening area of ​​the opening area 24 when S1<80mm is too small, and the opening area 24 cannot be opened normally, can be effectively avoided. Alternatively, when S1>1600mm, the opening area 24 occupies an excessive area of ​​the explosion-proof valve 20, the structural reliability of the explosion-proof valve 20 is reduced, and the opening area 24 is easy to be opened incorrectly, thereby affecting the service life of the explosion-proof valve 20. Therefore, the range of values ​​of S1 and S is specified, so that the ratio of S1 / S is within a suitable range, which ensures that the area of ​​the opening area 24 can meet the pressure release, while the structural strength of the opening area 24 is high, thereby ensuring the stability of the connection between the opening area 24 and the explosion-proof valve 20.

[0042] Hereinafter, the comparative examples 1 to 6 (i.e., the prior art) and the examples 1 to 6 (i.e., the present disclosure) will be used for explanation. The batteries of the comparative examples 1 to 6 and the battery 100 of the examples 1 to 6 (using the explosion-proof valve 20 of the present disclosure) are tested according to the method specified in GB / T31485-2015, respectively, and the pressure release rate curves of the corresponding batteries 100 are recorded. The conventional battery and the battery 100 of the examples are basically the same, and the values ​​of S1 and S of the comparative examples 1 to 6 are selected from Table 1, and the values ​​of S1 and S of the examples 1 to 6 are selected from Table 2, and the final test results are shown in FIG. 8 to FIG. 13. [Table 1] [Table 2]

[0043] 8 is a graph showing the internal pressure change curve of the battery 100 when the internal pressure of the battery 100 increases and is released in Example 1 and Comparative Example 1. From the graph, it can be seen that the air pressure drop change value in Example 1 is larger than that in Comparative Example 1 within a unit time. When the orthogonal projection area S of the explosion-proof valve 20 is constant, the larger the orthogonal projection area S1 of the opening area 24 is, the higher the pressure release rate within a unit time.

[0044] 9 is a graph showing the internal pressure change curve of the battery 100 when the internal pressure of the battery 100 increases and is released in Example 2 and Comparative Example 2. It can be seen from the graph that the air pressure drop change value in Example 2 is larger than that in Comparative Example 2 within a unit time. When the area S of the orthogonal projection of the explosion-proof valve 20 is constant, the larger the area S1 of the orthogonal projection of the opening area 24 is, the higher the pressure release rate within a unit time.

[0045] 10 is a graph showing the internal pressure change curve of the battery 100 when the internal pressure of the battery 100 increases and is released in Example 3 and Comparative Example 3. From the graph, it can be seen that the air pressure drop change value in Example 3 is larger than that in Comparative Example 3 within a unit time. When the area S of the orthogonal projection of the explosion-proof valve 20 is constant, the larger the area S1 of the orthogonal projection of the opening area 24 is, the higher the pressure release rate within a unit time.

[0046] 11 is a graph showing the internal pressure change curve of the battery 100 when the internal pressure of the battery 100 increases and is released in Example 4 and Comparative Example 4. From the graph, it can be seen that the air pressure drop change value in Example 4 is larger than the air pressure drop change value in Comparative Example 4 within a unit time. When the area S of the orthogonal projection of the explosion-proof valve 20 is constant, the larger the area S1 of the orthogonal projection of the opening area 24 is, the higher the pressure release rate within a unit time.

[0047] 12 is a graph showing the internal pressure change curve of the battery 100 when the internal pressure of the battery 100 increases and is released in Example 5 and Comparative Example 5. From the graph, it can be seen that the air pressure drop change value in Example 5 is larger than that in Comparative Example 5 within a unit time. When the orthogonal projection area S of the explosion-proof valve 20 is constant, the larger the orthogonal projection area S1 of the opening area 24 is, the higher the pressure release rate within a unit time.

[0048] 13 is a graph showing the internal pressure change curve of the battery 100 when the internal pressure of the battery 100 increases and is released in Example 6 and Comparative Example 6. From the graph, it can be seen that the air pressure drop change value in Example 6 is larger than that in Comparative Example 6 within a unit time. When the orthogonal projection area S of the explosion-proof valve 20 is constant, the larger the orthogonal projection area S1 of the opening area 24 is, the higher the pressure release rate within a unit time.

[0049] Therefore, in combination with Examples 1 to 6, within the range of the value of S1 / S protected by the technical solution of the present disclosure, the air displacement of the explosion-proof valve 20 within a unit time can be effectively improved, and the area of ​​the opening area 24 can meet the pressure release requirements, thereby improving the safety of the battery 100 using the explosion-proof valve 20.

[0050] In some embodiments, the notch groove 25 is a C-shaped notch groove, an X-shaped notch groove, a Y-shaped notch groove, or a double Y-shaped notch groove. However, the shape of the notch groove 25 is not limited to the above shapes, and the notch groove 25 may be any shape. The notch groove 25 may be designed according to the requirements to meet various usage scenarios, and the notch groove 25 may extend along the circumferential direction of the explosion-proof valve.

[0051] According to some specific embodiments of the present disclosure, in combination with Fig. 4 and Fig. 5, the notch groove 25 is a C-shaped notch groove. The notch groove 25 includes two arc-shaped first notches 251 arranged opposite to each other, a linear second notch 252, and two linear third notches 253 spaced apart from each other. The second notches 252 and the third notches 253 are arranged in parallel. Two ends of the second notches 252 are respectively connected to the two first notches 251. Each of the third notches 253 is connected to the corresponding first notches 251. In other words, the second notch 252 is connected to one end of each of the two first notches 251, and the other ends of the two first notches 251 are each connected to one third notch 253, and the two third notches 253 are spaced apart from each other. In the depth direction of the notch groove 25, two free ends of the outer edge of the orthogonal projection of the notch groove 25 are connected to form a connection line 263. That is, the connection line between the edges of the two third notches 253 on the side farther from the center of the explosion-proof valve is the connection line 263. The connection line 263 and the outer edge of the orthogonal projection of the notch groove 25 together form the preset opening boundary 241. At this point, the area of ​​the area defined by the preset opening boundary 241 (i.e., in the depth direction of the notch groove 25, the area of ​​the orthogonal projection of the opening area 24) is S c and

number

[0052] Also, the cross section of the notched groove 25 may be rectangular or inverted trapezoid. In this specification, the "cross section" refers to a plane parallel to the depth direction of the notched groove 25. When the cross section of the notched groove 25 is an inverted trapezoid, the width of the notched groove 25 gradually decreases along the direction toward the groove bottom of the notched groove 25. At this point, a1 may be understood as the length of the outer edge of the second notched portion 252 located at the groove top or opening, and b1 may be understood as the diameter of the outer edge of the arc-shaped first notched portion 251 located at the groove top or opening. In other words, in the depth direction of the notched groove 25 (i.e., the direction from the groove opening to the groove bottom of the notched groove 25), the outer edge of the orthogonal projection of the notched groove 25 includes two opposing semicircles, a1 may be understood as the distance between the centers of the two semicircles, and b1 may be understood as the diameter of the semicircles.

[0053] Optionally, as shown in FIG. 5, the notch groove 25 is a C-shaped notch groove, and the opening area 24 is provided with an X-shaped notch groove to achieve a structural reinforcement effect. The X-shaped notch groove includes two arc-shaped eighth notches 260. The two eighth notches 260 are symmetrically arranged in the width direction of the explosion-proof valve (for example, the vertical direction in FIG. 5), and the vertices of the two eighth notches 260 overlap each other. One of the two ends of the eighth notch portion 260 may extend to end at the third notch portion 253, and the other of the two ends of the eighth notch portion 260 may extend to end at the second notch portion 252. In the depth direction of the notch groove 25, the thickness of the opening area 24 corresponding to the eighth notch portion 260 may be thicker than the thickness of the opening area 24 corresponding to the second notch portion 252. At this point, the area of ​​the area defined by the preset opening boundary 241 (i.e., the area of ​​the orthogonal projection of the opening area 24 in the depth direction of the notch groove 25) is S x and

number

[0054] Also, the cross section of the notched groove 25 mentioned above may be rectangular or inverted trapezoid. In this specification, the "cross section" refers to a plane parallel to the depth direction of the notched groove 25. When the cross section of the notched groove 25 is an inverted trapezoid, the width of the notched groove 25 gradually decreases along the direction toward the groove bottom of the notched groove 25. At this point, a2 may be understood as the length of the outer edge of the second notched portion 252 located at the groove top or opening, and b2 may be understood as the diameter of the outer edge of the eighth notched portion 260 located at the groove top or opening. In other words, in the depth direction of the notched groove 25 (i.e., the direction from the groove opening to the groove bottom of the notched groove 25), the outer edge of the orthogonal projection of the notched groove 25 includes two opposing semicircles, b2 may be understood as the diameter of the semicircles, and a2 may be understood as the distance between the centers of the two semicircles.

[0055] In some embodiments, as shown in FIG. 6, the notch groove 25 is an annular notch groove. The opening area 24 is provided with a Y-shaped notch groove to achieve a structure reinforcement effect. The Y-shaped notch groove is located inside the annular notch groove and is connected to the annular notch groove. For example, the annular notch groove includes two arc-shaped fourth notches 254 arranged opposite to each other and two linear fifth notches 255 spaced apart from each other. Two ends of each of the fifth notches 255 are respectively connected to the two fourth notches 254, and the two fifth notches 255 and the two fourth notches 254 form a closed ring structure. In the depth direction of the notch groove 25, the outer edge of the orthogonal projection of the notch groove 25 forms a preset opening boundary 241. The preset opening boundary 241 may be bounded by the edges of the two fifth cutouts 255 and of the two fourth cutouts 254 away from the center of the explosion-proof valve.

[0056] The Y-shaped notch groove includes two linear ninth notch portions 261 and a linear tenth notch portion 262. One end of each of the two ninth notch portions 261 is connected to the tenth notch portion 262. An included angle β is formed between the two ninth notch portions 261. The other end of each of the two ninth notch portions 261 may be connected to one fifth notch portion 255. The other end of the tenth notch portion 262 may be connected to the fourth notch portion 254. The thickness corresponding to the Y-shaped notch groove may be thicker than the thickness corresponding to the annular notch groove in the opening area 24, that is, the depth of the Y-shaped notch groove is shallower than the depth of the annular notch groove. When the internal pressure of the battery 100 becomes high, the opening area 24 protrudes outward due to the action of the internal pressure. The Y-shaped notch groove may be deformed to resist deformation of the opening area 24, so as to improve the structural strength and deformation resistance of the opening area 24, thereby effectively preventing the explosion-proof valve from being erroneously opened. At this point, the area of ​​the area defined by the preset opening boundary 241 (i.e., the area of ​​the orthogonal projection of the opening area 24 in the depth direction of the notch groove 25) is S y and

number

[0057] Also, the cross section of the notched groove 25 may be rectangular or inverted trapezoid. In this specification, the "cross section" refers to a plane parallel to the depth direction of the notched groove 25. When the cross section of the notched groove 25 is an inverted trapezoid, the width of the notched groove 25 gradually decreases along the direction toward the groove bottom of the notched groove 25. At this point, a3 may be understood as the length of the outer edge of the fifth notched portion 255 located at the groove top or opening, and b3 may be understood as the diameter of the outer edge of the fourth notched portion 254 located at the groove top or opening. In other words, in the depth direction of the notched groove 25 (i.e., the direction from the groove opening to the groove bottom of the notched groove 25), the outer edge of the orthogonal projection of the notched groove 25 includes two opposing semicircles, b3 may be understood as the diameter of the semicircles, and a3 may be understood as the distance between the centers of the two semicircles.

[0058] In some embodiments, referring to FIG. 7, the notch groove 25 is a double Y-shaped notch groove. When the internal pressure of the battery 100 becomes high and needs to be released, the internal pressure may be released from the double Y-shaped notch groove, so that the opening area 24 is inverted to the support to realize pressure release. For example, the double Y-shaped notch groove includes a linear sixth notch portion 256 and four linear seventh notches 257. The two ends of the sixth notch portion 256 are respectively connected to two seventh notches 257 arranged at a preset included angle. In the depth direction of the notch groove 25, a first circular arc 259 is defined between the free ends of the orthogonal projections of the two seventh notches 257 located at the same end of the sixth notch portion 256. The first circular arc 259 has a center of a circle at the apex of the preset included angle of the two seventh notches 257. A first straight line 258 is defined between the free ends of the orthogonal projections of the two seventh notches 257 located on the same side of the sixth notch 256. The two first arcs 259 and the two first straight lines 258 together form a preset opening boundary 241. Note that since the widths of the sixth notch 256 and the seventh notch 257 are relatively small and negligible, the first arc 259 and the first straight line 258 may intersect at approximately one point. The first arc 259 may be understood to be defined by the free ends of the orthogonal projections of the two seventh notches 257 located on the same end of the sixth notch 256 that are close to each other. The first straight line 258 may be understood to be defined by the free ends of the orthogonal projections of the two seventh notches 257 located on the same side of the sixth notch 256 that are adjacent to each other.

[0059] It will be understood that the free end of the seventh notch 257 refers to the end of the seventh notch 257 far from the sixth notch 256. As shown in FIG. 7, along the left-to-right direction, the two seventh notches 257 located at the left end of the sixth notch 256 are close to each other to form a connection with the sixth notch 256, and the two seventh notches 257 located at the right end of the sixth notch 256 extend in a direction away from each other. At this point, the area of ​​the area defined by the preset opening boundary 241 (i.e., in the depth direction of the notch groove 25, the area of ​​the orthogonal projection of the opening area 24) is S dual-y and

number

[0060] Therefore, different shapes of the notch groove 25 can change the structural strength of the opening area 24, and an appropriate notch groove 25 can be selected according to different design criteria, which reduces the process difficulties of the explosion-proof valve and improves the pressure release speed of the explosion-proof valve and the safety performance of the battery 100.

[0061] Also, the cross section of the notched groove 25 may be rectangular or inverted trapezoid. In this specification, the "cross section" refers to a plane parallel to the depth direction of the notched groove 25. When the cross section of the notched groove 25 is an inverted trapezoid, the width of the notched groove 25 gradually decreases along the direction toward the groove bottom of the notched groove 25. At this point, a4 may be understood as the length of the outer edge of the sixth notch 256 located at the groove top or opening, b4 is the distance between the free ends of the two seventh notches 257 located on the same side of the sixth notch 256 located at the groove top or opening, and c4 is the length of the seventh notch 257 located at the groove top or opening.

[0062] In some embodiments, in the depth direction of the notch groove 25, the orthogonal projection shape of the opening area 24 is an oval, an ellipse, or a polygon. Therefore, different shapes of the opening area 24 can be selected according to different usage scenarios of the explosion-proof valve 20 to meet different opening requirements and enhance the practicability of the explosion-proof valve 20.

[0063] 2 and 4, in the depth direction of the notched groove 25, the outer contour of the orthogonal projection of the explosion-proof valve 20 includes two second straight lines 27 arranged in parallel and two second arcs 28 arranged opposite to each other. The two ends of each of the two second straight lines 27 are respectively connected to the two second arcs 28. The length of the second straight lines 27 is L, the radius of each second arc 28 is R, the distance between the two second straight lines 27 is 2R, and S, L, and R are expressed as S=πR. 2+2RL, 10mm≦L≦65mm, and 5mm≦R≦25mm are satisfied. Optionally, L=30mm, and R=50mm. Thus, the shape of the explosion-proof valve 20 is defined so that the explosion-proof valve 20 can be properly attached to the battery case 10, thereby releasing the internal pressure of the battery 100. After the explosion-proof valve 20 is welded and fixed to the battery case 10, a weld seam will be formed between the explosion-proof valve 20 and the case. Alternatively, after the explosion-proof valve 20 is welded and fixed to the cover plate of the battery 100, a weld seam will be formed between the explosion-proof valve 20 and the cover plate. The outer edge of the explosion-proof valve 20 is half the width of the weld seam. The width of the weld seam is the distance between the outer contour and the inner contour of the orthogonal projection of the weld seam in the depth direction of the notch groove.

[0064] In some embodiments, in the depth direction of the notch groove 25, the thickness of the opening area 24 is thinner than the thickness of other parts of the explosion-proof valve 20. That is, the thickness of the opening area 24 along the direction of the central axis of the explosion-proof valve 20 is thinner than the thickness of other parts of the explosion-proof valve 20 (for example, the support part 22 described later). Therefore, the thickness of the opening area 24 is thinner than the thickness of other parts of the explosion-proof valve 20, so that the process of thinning the opening area 24 is realized, the opening of the opening area 24 is facilitated, and the thickness of the opening area 24 is not so thick as to affect the normal opening of the explosion-proof valve 20.

[0065] In some embodiments, as shown in Fig. 3, in the depth direction of the notch groove 25, the thickness of the opening area 24 is H1, and H1 satisfies 0.1mm≦H1≦0.3mm. Therefore, the thickness of the opening area 24 is adjusted so that the thickness of the opening area 24 can meet the requirements of the product design and facilitate the smooth opening of the opening area 24, thereby ensuring the use safety of the explosion-proof valve 20.

[0066] In some specific embodiments, as shown in FIG. 3, the explosion-proof valve 20 further includes a connection portion 21, a buffer portion 23, and a support portion 22. The explosion-proof valve 20 is connected to the battery case 10 via the connection portion 21. The connection portion 21 is connected to the outer periphery side of the support portion 22. The support portion 22 and the connection portion 21 are spaced apart from each other along the thickness direction of the support portion 22, and the support portion 22 is located on one side of the connection portion 21 adjacent to the center of the battery case 10. The buffer portion 23 is connected between the connection portion 21 and the support portion 22. The opening area 24 is disposed in the support portion 22.

[0067] In the thickness direction of the explosion-proof valve 20, the connection portion 21 and the support portion 22 may be arranged horizontally. One end of the buffer portion 23 is connected to the inner periphery side of the connection portion 21, and the other end of the buffer portion 23 is connected to the outer periphery side of the support portion 22. When the connection portion 21 is connected to the battery case 10, the support portion 22 is arranged closer to the center of the battery case 10 than the connection portion 21. That is, the connection portion 21, the buffer portion 23, and the support portion 22 form a structure that is recessed toward the center of the battery case 10. Alternatively, the support portion 22 is arranged away from the center of the battery case 10 relative to the connection portion 21. That is, the connection portion 21, the buffer portion 23, and the support portion 22 form a structure that is convex away from the center of the battery case 10. With such an arrangement, the force acting on the connection portion 21 may be transmitted to the buffer portion 23 so as to prevent direct stress on the support portion 22 and the opening area 24 and improve the structural strength of the opening area 24 and the support portion 22. Also, the opening area 24 is formed in the middle of the support portion 22. The opening area 24 and the support portion 22 may be integrally molded, or the opening area 24 and the support portion 22 may be welded together.

[0068] Therefore, the explosion-proof valve 20 includes a connection part 21 and a support part 22. The connection part 21 may realize a fixed connection between the explosion-proof valve 20 and the battery case 10. The support part 22 may increase the structural strength of the opening area 24 so as to prevent the opening area 24 from being twisted or deformed by external force. In addition, the buffer part 23 is disposed between the connection part 21 and the support part 22, which can absorb the thermal stress when welding the opening area 24 to the support part 22, increase the reliability of the explosion-proof valve 20, and improve the safety of the explosion-proof valve 20, thereby effectively avoiding problems such as fire and explosion of the battery 100. In addition, the support part 22 is arranged on one side closer to the center of the battery case 10, or on one side farther from the center of the battery case 10, which can prevent the explosion-proof valve 20 from opening due to the impact of external force on the case, prevent stress on the opening area 24, effectively protect the explosion-proof valve 20, extend the service life of the explosion-proof valve 20, and improve the use stability.

[0069] In some embodiments, the buffer portion 23 may be connected vertically to both the connection portion 21 and the support portion 22. That is, since the buffer portion 23 is vertical to both the connection portion 21 and the support portion 22, the horizontal stress to the connection portion 21 can be converted into a stress in a direction perpendicular to the connection portion 21. Since the stress transmission direction is changed, the stress transmission direction is dispersed and the stress applied to the support portion 22 is reduced, thereby preventing the deformation of the opening area 24 due to the influence of the stress. In addition, the buffer portion 23 is connected vertically to the connection portion 21 and the support portion 22, which can improve the space utilization rate of the explosion-proof valve 20.

[0070] In some embodiments, as shown in Fig. 3, a groove 221 is formed in the support 22, and a notched groove 25 is formed in the bottom wall of the groove 221. Therefore, the protection of the support 22 for the opening area 24 can be improved. Meanwhile, since the process of thinning the opening area 24 is realized, when the internal pressure of the explosion-proof valve 20 becomes high and needs to be released, the opening area 24 can be smoothly opened, and the failure of the explosion-proof valve 20 can be avoided.

[0071] Also, the thickness of the opening area 24 may be variable in the depth direction of the notch groove 25. For example, the thickness of the center of the opening area 24 is thinner than the thickness of the edge, which ensures the strength of the connection between the opening area 24 and the support part 22 and reduces the manufacturing cost of the opening area 24.

[0072] In some embodiments, in the depth direction of the notched groove 25, the outer edge of the orthogonal projection of the groove 221 and the outer edge of the orthogonal projection of the notched groove 25 have an overlapping area. That is, the notched groove 25 is formed at the edge of the bottom wall of the groove 221. Therefore, the maximum area of ​​the opening area 24 can be ensured, which helps to improve the pressure release ability of the explosion-proof valve 20.

[0073] In some embodiments, as shown in Fig. 3, in the depth direction of the notched groove 25, the thickness of the support part 22 corresponding to the notched groove 25 is H2, and H2 satisfies 0.02mm≦H2≦0.2mm. Therefore, the thickness of the support part 22 corresponding to the notched groove 25 is adjusted, so that the opening area 24 can be smoothly opened from the notched groove 25 to realize pressure release without affecting the structural strength of the opening area 24, and the timeliness of the opening of the explosion-proof valve 20 is improved.

[0074] In some embodiments, in the depth direction of the notched groove 25, the thickness of the support 22 is H3, and H2 and H3 satisfy H2:H3=0.1-1. Therefore, the thickness of the support 22 corresponding to the groove 221 and the thickness of the support 22 are adjusted within a suitable ratio range, and the opening area 24 can meet the design strength requirements of the explosion-proof valve 20. Furthermore, the support 22 can meet the structural strength requirements, realize the protection of the opening area 24, and well adjust the manufacturing cost of the explosion-proof valve 20.

[0075] In some embodiments, one side of the opening area 24 that is remote from the battery case 10 is flush with one side of the support 22 that is remote from the battery case 10. The distance between one side of the opening area 24 that is adjacent to the center of the battery case 10 and the center of the battery case 10 is greater than the distance between one side of the support 22 that is adjacent to the center of the battery case 10 and the center of the battery case 10.

[0076] It will be understood that the opening area 24 is flush with the surface of one side of the support 22 that is far from the center of the battery case 10. In order to ensure smooth opening of the opening area 24, it is preferable that the thickness of the opening area 24 is set to be thinner than the thickness of the support 22. At this point, the distance between the opening area 24 and one side of the support 22 adjacent to the center of the battery case 10 is different from the distance between the opening area 24 and the center of the battery case 10. The distance from the opening area 24 to the center of the battery case 10 is greater than the distance from the support 22 to the center of the battery case 10. Thus, in one aspect, the effect of the electrolyte vibrating inside the battery case 10 on the opening area 24 can be reduced, and the high cost of use of the battery 100 due to pressure release can be prevented when the explosion-proof valve 20 has not reached its design threshold. In another aspect, the relatively thin thickness of the opening area 24 can facilitate smooth opening of the explosion-proof valve 20, thereby further improving the safety of use of the battery 100.

[0077] In some embodiments, as shown in FIG. 3, in the depth direction of the notch groove 25, the thickness of the support part 22 is H3, and the thickness of the connection part 21 is H4, and H3 and H4 satisfy H3:H4=0.25 to 1. Therefore, the thicknesses of the support part 22 and the connection part 21 are appropriately adjusted, so that H3:H4 is within an appropriate ratio range, which facilitates the support of the opening area 24 by the support part 22 and the connection between the explosion-proof valve 20 and the battery case 10. Meanwhile, the thickness of the explosion-proof valve 20 can be avoided from being excessively thick, so that when the explosion-proof valve 20 is matched with the battery case 10, the two sides of the explosion-proof valve 20 can be flush with the inner and outer surfaces of the battery case 10, which increases the battery core accommodation capacity of the battery case 10.

[0078] In some embodiments, as shown in FIG. 3, in the depth direction of the notched groove 25, the height of the explosion-proof valve 20 is H5. In the thickness direction of the buffer part 23 (i.e., the thickness direction of the battery 100), the wall thickness of the buffer part 23 (the radial direction of the explosion-proof valve, for example, the distance along the left-right direction of FIG. 3) is D1. H5 and D1 respectively satisfy 0.3 mm≦H5≦1.5 mm and 0.2 mm≦D1≦0.8 mm. Therefore, by adjusting the height of the explosion-proof valve 20 and the wall thickness of the buffer part 23, when the explosion-proof valve 20 meets the buffer effect design, the dimensional specification of the explosion-proof valve 20 can be well adjusted, which increases the reliability of the assembly between the explosion-proof valve 20 and the battery case 10, improves the assembly performance, and avoids the influence on the installation of other parts in the battery 100.

[0079] 2 and 3, in some embodiments, the width of the support portion 22 in the thickness direction of the buffer portion 23 (i.e., the thickness direction of the battery 100) is D2. In the depth direction of the notched groove 25, the thickness of the support portion 22 is H3. D2 and H3 satisfy 0.2 mm≦D2≦2 mm and 0.2 mm≦H3≦0.8 mm, respectively. Thus, by setting the width and thickness of the support portion 22, the support portion 22 can satisfactorily support and protect the opening area 24 while ensuring the structural strength of the support portion 22, thereby preventing deformation of the opening area 24 due to stress.

[0080] In some embodiments, as shown in FIG. 2, in the thickness direction of the buffer portion 23 (i.e., in the thickness direction of the battery 100), the width of the connection portion 21 is D3. In the depth direction of the notch groove 25, the thickness of the connection portion 21 is H4. D3 and H4 satisfy 1 mm≦D3≦5 mm and 0.2 mm≦H4≦0.8 mm, respectively. Therefore, the thickness and width of the connection portion 21 are appropriately set to improve the reliability of the connection between the connection portion 21 and the battery case 10. Meanwhile, by adjusting the thickness of the connection portion 21, the connection portion 21 can be as flush as possible with the surface of the battery case 10 when connected to one side of the battery case 10, thereby reducing the occupation of the internal space of the battery case 10 and facilitating the arrangement of elements in the battery case 10.

[0081] A battery 100 according to an embodiment of the second aspect of the present disclosure includes a battery case 10 and an explosion-proof valve 20.

[0082] Specifically, as shown in Figures 1 to 3 and 14, the explosion-proof valve 20 is disposed in the battery case 10. Therefore, by using the explosion-proof valve 20 according to the embodiment of the above-mentioned first aspect of the present disclosure, the internal pressure can be released in a timely manner after the battery 100 is damaged, the protection of the battery 100 is enhanced, the use safety of the battery 100 is improved, and the use cost of the battery 100 is reduced.

[0083] Referring to FIG. 15, a battery module 200 according to an embodiment of the third aspect of the present disclosure includes the battery 100 according to the embodiment of the above-described second aspect of the present disclosure.

[0084] The battery module 200 includes two end plates (not shown) and two side plates (not shown). The multiple batteries 100 are sequentially arranged to form a battery array. The two end plates are arranged at two opposite ends of the battery array, and the two side plates are arranged at two opposite sides of the battery array. For example, the multiple batteries 100 including the battery array are sequentially arranged along the thickness direction of the battery 100. The two end plates may be distributed to the two ends of the battery array along the thickness direction of the battery 100. The two side plates may be distributed to the two sides of the battery array along the length direction or width direction of the battery 100.

[0085] In combination with FIG. 1 to FIG. 3, an opening may be formed in the battery case 10, and the explosion-proof valve 20 may be disposed on one side of the opening of the battery case 10. The connection part 21 of the explosion-proof valve 20 may be connected to the battery case 10 by welding. The buffer part 23 is located within the opening and faces the opening in the radial direction. The support part 22 is connected to one end of the buffer part 23 far from the connection part 21, and the surface of the support part 22 on one side adjacent to the center of the battery case 10 is flush with the inner surface of the one side of the battery case 10 where the opening is provided. Therefore, by adjusting the areas of the opening area 24 and the explosion-proof valve 20, the opening area of ​​the opening area 24 is maximized, and the safety of the use of the battery 100 is further improved.

[0086] When the battery 100 is subjected to an external force or internal stress, the buffer part 23 can absorb the deformation stress and convert the horizontal force of the connection part 21 into a force in a direction perpendicular to the support part 22, which prevents the stress from being excessively concentrated and affecting the stability of the opening area 24 or damaging the structure of the notched groove 25. In addition, the deformation of the notched groove 25 due to the stress can be prevented, and the influence of the external force on the opening pressure of the explosion-proof valve 20 (for example, the stress generated by the thermal deformation during welding of the explosion-proof valve 20) is reduced.

[0087] Therefore, the explosion-proof valve 20 can be used to open the opening area 24 in a timely manner to release pressure, thereby improving the safety of using the battery 100. In addition, the buffer part 23 of the explosion-proof valve 20 is designed to realize the absorption of stress and the change of the transfer direction, reduce the impact of external force on the opening area 24, and extend the service life of the battery 100.

[0088] Referring to FIG. 15 , a battery pack 300 according to an embodiment of the fourth aspect of the present disclosure includes a battery 100 according to an embodiment of the second aspect of the present disclosure described above, or a battery module 200 according to an embodiment of the third aspect of the present disclosure described above.

[0089] The battery pack 300 includes a tray (not shown). The tray is fixed to the vehicle 400. The battery 100 according to the embodiment in the above-mentioned second aspect is directly placed on the tray, or the battery module 200 according to the embodiment in the above-mentioned third aspect is fixed inside the tray.

[0090] Therefore, the area ratio of the opening area 24 to the explosion-proof valve 20 is adjusted, so that the safety of the use of the battery 100 can be improved, and the safety of the use of the battery module 200 and the battery pack 300 can be improved. The explosion-proof valve 20 of the battery 100 in the battery module 200 can be located close to the bottom of the battery module 200, so that when the battery 100 is heated and released, the air flow can be prevented from rushing into the vehicle body, thereby avoiding secondary damage and improving the use stability of the battery pack 300.

[0091] With reference to FIG. 15, a vehicle 400 according to an embodiment of the fifth aspect of the present disclosure includes the battery pack 300 according to the embodiment of the aforementioned fourth aspect of the present disclosure.

[0092] Therefore, the possibility of explosion or combustion of the vehicle 400 can be reduced, and when the battery pack 300 receives an external impact, the possibility of the opening area 24 being deformed and the explosion-proof valve 20 being opened is reduced. In addition, the buffer part 23 can absorb partial stress and change the direction of force transmission, thereby improving the reliability of the battery pack 300, thereby reducing the usage cost of the vehicle 400.

[0093] In describing the present disclosure, it should be understood that orientations or positions indicated by terms such as "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" are based on the orientations or positions shown in the accompanying drawings, and are used only to explain and simplify the description of the present disclosure, rather than to indicate or imply that the devices or elements referred to need to have a particular orientation or be constructed and operated in a particular orientation. Thus, such terms cannot be construed as limitations on the present disclosure.

[0094] In the description of this disclosure, a "first feature" and a "second feature" may include one or more of the features. In the description of this disclosure, "multiple" means two or more. In the description of this disclosure, a first feature being "on" or "below" a second feature may include the first feature and the second feature being in direct contact, or the first feature and the second feature not being in direct contact, but being in contact through an additional feature between the first feature and the second feature. In the description of this disclosure, a first feature being "on," "above," or "over" a second feature may include the first feature being directly above and diagonally above the second feature, or simply indicates that the level of the first feature is higher than the level of the second feature.

[0095] In the description herein, the description of a reference term such as "an embodiment," "some embodiments," "exemplary embodiments," "examples," "specific examples," or "some examples" means that a particular feature, structure, material, or characteristic described with reference to an embodiment or example is included in at least one embodiment or example of the present disclosure. As used herein, exemplary descriptions of such terms do not necessarily refer to the same embodiment or example.

[0096] Although embodiments of the present disclosure have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the present disclosure, and the scope of the present disclosure is defined by the appended claims and equivalents of the appended claims.

Claims

1. An explosion-proof valve (20), the explosion-proof valve (20) is provided with a notched groove (25), the explosion-proof valve (20) has an opening area (24) in a depth direction of the notched groove (25), the shape of the orthogonal projection of the opening area (24) is non-circular, the outer edge of the orthogonal projection of the opening area (24) is a preset opening boundary (241), and the area of ​​the orthogonal projection of the opening area (24) is S １ The area of ​​the orthogonal projection of the explosion-proof valve (20) is S, and S １ and S is S １ / S≧0.3 is satisfied, and S １ Both and S are in mm. ２ That is, the explosion-proof valve (20).

2. S １ and S is S １ 2. The explosion-proof valve (20) of claim 1, further satisfying / S≦0.

95.

3. S １ and S is 80 mm ２ ≦S １ ≦1600mm ２ , 178.5 mm ２ ≦S≦5212.5mm ２ The explosion-proof valve (20) according to claim 1 or 2, which satisfies the above.

4. The notch groove (25) comprises two arcuate first notch portions (251) arranged opposite to each other, a linear second notch portion (252), and two linear third notch portions (253) spaced apart from each other, the second notch portions (252) and the third notch portions (253) are arranged in parallel, two ends of the second notch portion (252) are respectively connected to the two first notch portions (251), and each of the third notch portions (253) is connected to a corresponding one of the first notch portions (251); The explosion-proof valve (20) according to any one of claims 1 to 3, wherein in the depth direction of the notched groove (25), two free ends of an outer edge of the orthogonal projection of the notched groove (25) are connected to form a connecting line (263), and the connecting line (263) and the outer edge of the orthogonal projection of the notched groove (25) together form the preset opening boundary (241).

5. the notch groove (25) comprises two arcuate fourth notch portions (254) arranged opposite to each other and two linear fifth notch portions (255) arranged in parallel, two ends of each of the fifth notch portions (255) are respectively connected to the two fourth notch portions (254), and the two fifth notch portions (255) and the two fourth notch portions (254) form a closed ring structure; The explosion-proof valve (20) according to any one of claims 1 to 3, wherein in the depth direction of the notched groove (25), an outer edge of an orthogonal projection of the notched groove (25) forms the predetermined opening boundary (241).

6. The notch groove (25) has a sixth straight notch portion (256) and four straight seventh notch portions (257), and two ends of the sixth notch portion (256) are connected to two seventh notch portions (257), respectively, and two of the seventh notch portions (257) are connected at a preset included angle; 4. The explosion-proof valve according to claim 1, wherein in a depth direction of the notch groove, a first circular arc is defined between free ends of the orthogonal projections of the two seventh notches located at the same end of the sixth notch, the first circular arc has a center of a circle at a vertex of the preset included angle, and a first straight line is defined between the free ends of the orthogonal projections of the two seventh notches located at the same side of the sixth notch, the two first circular arcs and the two first straight lines together forming the preset opening boundary.

7. In the depth direction of the notch groove (25), the outer contour of the orthogonal projection of the explosion-proof valve (20) comprises two second straight lines (27) arranged in parallel and two second circular arcs (28) arranged opposite each other, and two ends of each of the two second straight lines (27) are respectively connected to the two second circular arcs (28), the length of the second straight lines (27) is L, the radius of each of the second circular arcs (28) is R, the distance between the two second straight lines (27) is 2R, and S, L, and R are expressed as S=πR. ２ The explosion-proof valve (20) according to any one of claims 1 to 6, satisfying +2RL, 10 mm≦L≦65 mm, and 5 mm≦R≦25 mm.

8. The explosion-proof valve (20) according to any one of claims 1 to 7, wherein in the depth direction of the notch groove (25), the thickness of the opening area (24) is thinner than the thickness of other parts of the explosion-proof valve (20).

9. In the depth direction of the notched groove (25), the thickness of the opening area (24) is H １ And H １ However, 0.1 mm ≦ H １ The explosion-proof valve (20) according to any one of claims 1 to 8, which satisfies ≦0.3 mm.

10. 10. The explosion-proof valve (20) according to any one of claims 1 to 9, wherein in the depth direction of the notched groove (25), the orthogonal projection shape of the opening area (24) is oval, elliptical or polygonal.

11. 11. The explosion-proof valve (20) according to any one of claims 1 to 10, further comprising a connection portion (21), a buffer portion (23), and a support portion (22), the connection portion (21) being connected to an outer circumferential side of the support portion (22), the support portion (22) and the connection portion (21) being spaced apart along a thickness direction of the support portion (22), the buffer portion (23) being connected between the connection portion (21) and the support portion (22), and the opening area (24) being disposed in the support portion (22).

12. The explosion-proof valve (20) according to claim 11, wherein a groove (221) is formed in the support part (22), and the notched groove (25) is formed in a bottom wall of the groove (221).

13. 13. The explosion-proof valve (20) according to claim 12, wherein in the depth direction of the notched groove (25), the outer edge of the orthogonal projection of the groove (221) and the outer edge of the orthogonal projection of the notched groove (25) have an overlap area.

14. In the depth direction of the notched groove (25), the thickness of the support portion (22) corresponding to the notched groove (25) is H ２ And H ２ However, 0.02 mm≦H ２ 14. The explosion-proof valve (20) according to any one of claims 11 to 13, wherein the thickness satisfies ≦0.2 mm.

15. In the depth direction of the notched groove (25), the thickness of the support portion (22) is H ３ And H ２ and H ３ But, H ２ :H ３ The explosion-proof valve (20) according to claim 14, wherein:

16. In the depth direction of the notched groove (25), the thickness of the support portion (22) is H ３ and the thickness of the connection portion (21) is H ４ And H ３ and H ４ But, H ３ :H ４ The explosion-proof valve (20) according to any one of claims 11 to 15, wherein:

17. In the depth direction of the notched groove (25), the height of the explosion-proof valve (20) is H ５ In the thickness direction of the buffer portion (23), the wall thickness of the buffer portion (23) is D １ And H ５ and D. １ Each of them is 0.3 mm or less H ５ ≦1.5mm, 0.2mm≦D １ 17. The explosion-proof valve (20) according to any one of claims 11 to 16, wherein the thickness satisfies ≦0.8 mm.

18. In the thickness direction of the buffer portion (23), the width of the support portion (22) is D ２ In the depth direction of the notched groove (25), the thickness of the support portion (22) is H ３ And D ２ and H ３ Each of them is 0.2 mm ≦ D ２ ≦2mm, and 0.2mm≦H ３ 18. The explosion-proof valve (20) according to any one of claims 11 to 17, wherein the thickness satisfies ≦0.8 mm.

19. In the thickness direction of the buffer portion (23), the width of the connection portion (21) is D ３ In the depth direction of the notched groove (25), the thickness of the connection portion (21) is H ４ And D ３ and H ４ Each of them is 1 mm ≦ D ３ ≦5mm, and 0.2mm≦H ４ 19. The explosion-proof valve (20) according to any one of claims 11 to 18, wherein the thickness satisfies ≦0.8 mm.

20. A battery case (10); 20. The explosion-proof valve (20) according to any one of claims 1 to 19, wherein the explosion-proof valve (20) is disposed in the battery case (10); A battery (100).

21. A battery module (200) comprising the battery (100) of claim 20.

22. A battery pack (300) comprising the battery (100) of claim 20 or the battery module (200) of claim 21.

23. A vehicle (400) comprising a battery pack (300) according to claim 22.

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