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

Abstract

A vehicle (600) having a battery pack (500) is provided. The battery pack (500) includes a battery (300) or a battery module (400). The battery module (400) includes a battery (300). The battery (300) includes an explosion-proof valve (200). The explosion-proof valve (200) includes an explosion-proof valve body (100). The explosion-proof valve body (100) is provided with a cleft (11), which includes two first clefts (111), two second clefts (112), and one third cleft (113). One end of each of the two first clefts (111) and one end of each of the two second clefts (112) are connected to both ends of the third cleft (113), respectively. The other ends of the two first grooves (111) extend in a direction away from each other, and the other ends of the second grooves (112) extend in a direction away from each other. The explosion-proof valve body (100) has an opening region 10. In the depth direction of the groove, the outer edge of the orthogonal projection of the opening region (10) is a predetermined opening boundary (131), and the orthogonal projection of the opening region (10) has an area (I), and S≧80 mm 2 , c≧4mm, and α≧30°.

Description

[Technical field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to and the benefit of Chinese Patent Application No. 202221128933.5, filed on May 12, 2022. The entire contents of the above application are incorporated herein by reference.

[0002] Technical Field 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] In the prior art, the explosion-proof valve of the battery is usually welded to the cover plate of the battery. When the gas pressure in the battery exceeds the opening pressure of the explosion-proof valve, the explosion-proof valve can open to release the gas generated inside the battery, thereby preventing safety accidents such as battery explosion. However, when the pressure in the battery changes and the pressure in the battery becomes too high, if the opening area of ​​the explosion-proof valve is unreasonable, the pressure cannot be released in a timely manner, which affects the safety of the battery and the entire battery system. Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure aims to solve at least one of the technical problems in the prior art. Therefore, the first objective of the present disclosure is to provide an explosion-proof valve, which can make the opening area of ​​the explosion-proof valve body more reasonable, and can increase the speed of pressure release when the explosion-proof valve is attached to a battery, thereby improving the safety of the use of the explosion-proof valve.

[0005] A second object of the present disclosure is to provide a battery that uses an explosion-proof valve.

[0006] A third object of the present disclosure is to provide a battery module that uses a battery.

[0007] A fourth object of the present disclosure is to provide a battery pack that uses a battery module or a battery.

[0008] A fifth object of the present disclosure is to provide a vehicle that uses a battery or a battery pack. [Means for solving the problem]

[0009] An embodiment of a first aspect of the present disclosure provides an explosion-proof valve including an explosion-proof valve body, the explosion-proof valve body having a cleft, the cleft including two first clefts, two second clefts, and a third cleft, one end of each of the two first clefts and one end of each of the two second clefts are respectively connected to both ends of the third cleft, the other end of one of the two first clefts extends away from the other end of the other of the two first clefts, the other end of one of the two second clefts extends away from the other end of the other of the two second clefts, and The length of the three fissures is defined as a, the distance between the other end of the first fissure and the other end of the second fissure is defined as b, the length of each of the first fissures and the length of each of the second fissures are equal and both are defined as c, the angle between the two first fissures and the angle between the two second fissures are equal and both are defined as α, the explosion-proof valve body includes an opening area, the outer edge of the orthogonal projection of the opening area is a predetermined opening boundary in the depth direction of the fissure, and the area of ​​the orthogonal projection of the opening area is defined as S, where S, c, and α are respectively;

number

[0010] In the fissure depth direction, a first circular arc is defined between the free ends of the orthogonal projections of the two first fissures, the first circular arc is centered on the apex of the angle α between the two first fissures, a second circular arc is defined between the free ends of the orthogonal projections of the two second fissures, the second circular arc is centered on the apex of the angle α between the two second fissures, and a first straight line is defined between the free ends of the orthogonal projections of the first fissure and the second fissure on the same side of the third fissure, and the first circular arc, the second circular arc, and the two first straight lines together form a predetermined opening boundary.

[0011] According to the explosion-proof valve of the embodiment of the present disclosure, the area S of the opening of the explosion-proof valve body is reasonably designed by defining the range of values ​​of S, c, and α. When the explosion-proof valve is attached to the battery and the internal pressure of the battery rises and needs to be released, the explosion-proof valve can be opened in a timely manner, so that the pressure can be released in a timely manner, thereby ensuring the safety of the battery.

[0012] In some examples, c further satisfies c≦10 mm.

[0013] In some examples, α further satisfies α≦150°.

[0014] In some examples, a satisfies 10 mm≦a≦40 mm.

[0015] In some examples, b satisfies 15 mm≦b≦50 mm.

[0016] In some examples, the third cleft extends along the length of the explosion-proof valve body, one of the first clefts extends towards one width side of the explosion-proof valve body and the other of the first clefts extends towards the other width side of the explosion-proof valve body, and one of the second clefts extends towards one width side of the explosion-proof valve body and the other of the second clefts extends towards the other width side of the explosion-proof valve body.

[0017] In some instances, the cleft is a centrosymmetric structure.

[0018] In some instances, a notch is formed in the explosion-proof valve body and the fissure is formed in a bottom wall of the notch.

[0019] In some examples, a sidewall of the cleft away from the center of the explosion-proof valve body is flush with a sidewall of the notch away from the center of the explosion-proof valve body.

[0020] In some examples, the explosion-proof valve body includes a connection portion, a buffer portion, and a support portion, the connection portion is connected to an outer peripheral side of the support portion, the support portion is spaced from the connection portion in a thickness direction of the support portion, the buffer portion is connected between the connection portion and the support portion, and the crack is formed in the support portion.

[0021] In some instances, the explosion-proof valve body is a flat plate structure.

[0022] In some examples, the open area is oblong.

[0023] In some examples, the explosion-proof valve body is an aluminum alloy component or a steel component.

[0024] An embodiment of a second aspect of the present disclosure provides a battery including an anti-explosion valve according to an embodiment of the first aspect.

[0025] In some examples, the energy density of the battery is defined as E, where E satisfies 200wh / kg≦E≦280wh / kg.

[0026] An embodiment of a third aspect of the present disclosure provides a battery module including a battery according to the embodiment of the second aspect of the present disclosure.

[0027] An embodiment of the fourth aspect of the present disclosure provides a battery pack including 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.

[0028] An embodiment of the fifth aspect of the present disclosure provides a vehicle including a battery according to the embodiment of the second aspect of the present disclosure or a battery pack according to the embodiment of the fourth aspect of the present disclosure.

[0029] Additional aspects and advantages of the disclosure will be set forth in part in the description which follows, and in part will be apparent from the description, or may be learned by practice of the disclosure.

[0030] The above and / or other additional aspects and advantages of the present disclosure will become apparent and understandable from the following detailed description of the embodiments taken in conjunction with the accompanying drawings. [Brief description of the drawings]

[0031] [Figure 1] 1 is a schematic diagram of an explosion-proof valve according to one embodiment of the present disclosure. [Diagram 2] 1 is a schematic cross-sectional view of an explosion-proof valve according to one embodiment of the present disclosure. [Diagram 3] FIG. 2 is a schematic diagram illustrating a comparison between the pressure release rates of the batteries of Comparative Example 1, Example 1, and Example 2 according to the present disclosure. [Figure 4] FIG. 1 is a schematic diagram illustrating a comparison between the pressure release rates of the batteries of Comparative Example 2, Example 3, and Example 4 according to the present disclosure. [Diagram 5] FIG. 11 is a schematic diagram illustrating a comparison between the pressure release rates of the batteries of Comparative Example 3, Example 5, and Example 6 according to the present disclosure. [Figure 6] 1 is a schematic diagram of a vehicle according to one embodiment of the present disclosure. [Figure 7] FIG. 2 is a schematic diagram of a vehicle according to another embodiment of the present disclosure. [Figure 8] FIG. 2 is a schematic diagram of a vehicle according to yet another embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] The embodiments of the present disclosure will be described in detail below. The embodiments described with reference to the accompanying drawings are merely examples. An explosion-proof valve 200 according to an embodiment of the present disclosure will be described below with reference to Figs. 1-2. The following description of the present disclosure will be given with reference to an example in which the explosion-proof valve 200 is attached to a battery 300 and used to release the pressure of the battery 300 when the internal pressure of the battery 300 rises.

[0033] As shown in FIGS. 1 and 2, one embodiment of the first aspect of the present disclosure provides an explosion-proof valve 200 including an explosion-proof valve body 100 .

[0034] Specifically, the explosion-proof valve body 100 has a fissure 11. In the depth direction of the fissure 11 (i.e., the direction from the fissure top to the fissure bottom), the thickness of the explosion-proof valve body 100 at the position corresponding to the fissure 11 is thinner than the thickness of the other parts of the explosion-proof valve body 100. When the explosion-proof valve 200 is attached to the battery 300 and the internal pressure of the battery 300 rises and reaches the opening pressure of the explosion-proof valve 200, the pressure can first open the fissure 11 to quickly discharge the gas, thereby realizing smooth pressure release. When the explosion-proof valve body 100 is fixed to the housing of the battery 300 by welding, a welded seam is formed between the explosion-proof valve body 100 and the housing. Alternatively, when the explosion-proof valve body 100 is fixed to the cover plate of the battery 300 by welding, a welded seam is formed between the explosion-proof valve body 100 and the cover plate of the battery 300. The outer periphery of the explosion-proof valve body 100 is half the width of the welded seam. The width of the weld seam is the distance between the outer and inner contours of the orthogonal projection of the weld seam in the depth direction of the fissure 11 .

[0035] The fissure 11 includes two first fissures 111, two second fissures 112, and a third fissure 113. One end of each of the two first fissures 111 and one end of each of the two second fissures 112 are connected to both ends of the third fissure 113, respectively. The other end of one of the two first fissures 111 extends away from the other end of the other of the two first fissures 111. The other end of one of the two second fissures 112 extends away from the other end of the other of the two second fissures 112.

[0036] For example, in the example of Figure 1, the end of each first fissure 111 connected to the third fissure 113 may be defined as a first end (i.e., the right end of the first fissure 111), and the other end of each first fissure 111 remote from the third fissure 113 is defined as a second end (i.e., the left end of the first fissure 111). The end of each second fissure 112 connected to the third fissure 113 is defined as a third end (i.e., the left end of the second fissure 112), and the other end of each second fissure 112 remote from the third fissure 113 is defined as a fourth end (i.e., the right end of the second fissure 112). The first ends of the two first fissures 111 are both connected to one end of the third fissure 113, and the distance between the two first fissures 111 increases from the first end to the second end (i.e., from right to left). Similarly, the third ends of the two second fissures 112 are both connected to the other end of the third fissure 113, and the distance between the two second fissures 112 increases from the third end to the fourth end (i.e., from left to right).

[0037] The length of the third fissure 113 is defined as a, and the maximum distance between the other end (i.e., the second end) of the first fissure 111 and the other end (i.e., the fourth end) of the second fissure 112 is defined as b. For example, in the example of FIG. 1, the two first fissures 111 and the two second fissures 112 are symmetrically distributed with respect to the length direction (e.g., the left to right direction in FIG. 1) of the third fissure 113, respectively. In this case, the maximum distance b may be the maximum distance between the final portion at the second end of the two first fissures 111 and the final portion at the fourth end of the second fissure 112. However, the present disclosure is not limited thereto.

[0038] The length of each of the first fissures 111 and the length of each of the second fissures 112 are equal and both are defined as c. The angle between the two first fissures 111 and the angle between the two second fissures 112 are equal and both are defined as α. The explosion-proof valve body 100 includes an opening region 10. The outer edge of the orthogonal projection of the opening region 10 is a predetermined opening boundary 131 in the depth direction of the fissure 11. The area of ​​the orthogonal projection of the opening region 10 is defined as S, where S, c, and α are respectively:

number

[0039] In the depth direction of the fissure 11, a first arc 13 is defined between the free ends E of the orthogonal projection of the two first fissures 111. The first arc 13 is centered on the apex of the angle α between the two first fissures 111. A second arc 132 is defined between the free ends F of the orthogonal projection of the two second fissures 112. The second arc 132 is centered on the apex of the angle α between the two second fissures 112. A first straight line 12 is defined between the free ends G of the orthogonal projection of the first fissure 111 and the second fissure 112 on the same side of the third fissure 113. The first arc 13, the second arc 132 and the two first straight lines 12 together form a predetermined opening boundary 131.

[0040] It can be seen that the area of ​​the orthogonal projection of the opening region 10 in the depth direction of the fissure 11 is the area of ​​the region defined within a given opening boundary 131. The widths of the first fissure 111 and the second fissure 112 are relatively small and can be neglected, so the first arc 13 and the first straight line 12 intersect at approximately one point. The first arc 13 may be understood to be defined by the free ends that are closed to each other within the orthogonal projection of the two first fissures 111. For example, in FIG. 1, the first arc 13 is defined by the free ends E on both sides of the orthogonal projection of the two first fissures 111 located at the left end of the third fissure 113. The second arc 132 may be understood to be defined by the free ends on both sides of the orthogonal projection of the two second fissures 112. For example, in FIG. 1, the second arc 132 is defined by the free ends F on both sides of the orthogonal projection of the two second fissures 112 located at the right end of the third fissure 113. The first straight line 12 may be understood to be defined by the free ends on both sides of the orthogonal projection of the first fissures 111 and the second fissures 112 on the same side of the third fissure 113. For example, in FIG. 1, the first straight line 12 is defined by the free ends G on both sides of the orthogonal projection of the first fissures 111 and the second fissures 112 above the third fissure 113, and similarly, the other first straight line 12 is defined by the free ends G on both sides of the orthogonal projection of the first fissures 111 and the second fissures 112 below the third fissure 113.

[0041] The explosion-proof valve 200 may be disposed on one side of the housing of the prismatic battery 300. The oblong opening area 10 can better fit the shape of the housing of the battery 300, so that the area of ​​the opening area 10 can be increased, and thus the gas discharge can be increased. Alternatively, the opening area 10 may be elliptical, etc. It can be seen that the specific shape of the opening area 10 may be set according to actual requirements to better meet actual applications.

[0042] The area of ​​the orthogonal projection of the opening area 10 of the explosion-proof valve body 100 can be designed more rationally by defining the range of values ​​of S, c, and α, so that the amount of gas discharged through the explosion-proof valve 200 per unit time can be effectively increased, thereby realizing a more ideal pressure release effect. In addition, defining the area S of the orthogonal projection of the opening area 10 of the explosion-proof valve body 100 can ensure that the opening area of ​​the explosion-proof valve body 100 can be increased when the internal pressure of the battery 300 rises, so as to facilitate effective pressure release and enhance the safety of the battery 300, thereby reducing the possibility that the entire explosion-proof valve 200 cannot be opened in a timely manner and is opened due to an excessively small area of ​​the opening, and avoiding dangerous situations such as the explosion of the battery 300 due to the inability to release pressure in a timely manner.

[0043] According to the explosion-proof valve 200 of the embodiment of the present disclosure, the opening area S of the explosion-proof valve body 100 is reasonably designed by limiting the value range of S, c, and α. When the explosion-proof valve 200 is attached to the battery 300 and the internal pressure of the battery 300 rises and needs to be released, the explosion-proof valve 200 can be opened in a timely manner, so that the pressure can be released in a timely manner, thereby ensuring the use safety of the battery 300.

[0044] It is understood that the cross section of the fissure 11 may be rectangular or inverted trapezoidal. The term "cross section" in this specification refers to a plane parallel to the depth direction of the fissure 11. When the cross section of the fissure 11 is an inverted trapezoid, the width of the fissure 11 gradually decreases toward the fissure bottom of the fissure 11. In this case, a may be understood as the length of the outer edge at the fissure top or opening of the third fissure 113. b may be understood as the maximum distance between the opposing side surfaces at the fissure opening of the first fissure 111 and the second fissure 112 on the same side of the third fissure 113. α may be understood as the angle between the opposing outer edges at the fissure opening of the first fissure 111, or the angle between the opposing outer edges at the fissure opening of the second fissure 112.

[0045] Furthermore, c and α further satisfy c≦10 mm, α≦150°. Therefore, by defining the upper limit of c and α, the area S of the orthogonal projection of the opening area 10 can effectively ensure that the value of α is too large to prevent a part of the area of ​​the explosion-proof valve body 100 from being opened normally, and the influence on the pressure release ability of the explosion-proof valve 200 can also be avoided, thereby improving the structural stability of the explosion-proof valve 200.

[0046] In some embodiments, a and b satisfy 10mm≦a≦40mm and 15mm≦b≦50mm, respectively. Therefore, by defining the range of a and b, the position of the fissure 11 on the explosion-proof valve body 100 can be made more reasonable, so that the opening area of ​​the explosion-proof valve body 100 can be increased during the pressure release of the battery 300, thereby improving the use safety of the battery 300.

[0047] Comparative Examples 1-3 (i.e., prior art) and Examples 1-6 (i.e., examples of the present disclosure) are described below. Using the method specified in GB / T31485-2015, the batteries of Comparative Examples 1-3 and the batteries 300 of Examples 1-6 were tested, respectively, and the pressure release rate curves of the corresponding batteries 300 were recorded. The values ​​of a, b, c, α, and S of Comparative Examples 1-3 are selected from Table 1 below. The values ​​of a, b, c, α, and S of Examples 1-6 are selected from Table 2 below. The final test results are shown in Figures 3-5. [Table 1] [Table 2]

[0048] As can be seen from the above, Fig. 3 is a graph showing the change in gas pressure inside the battery during pressure release when the pressure inside the battery increases in Example 1, Example 2, and Comparative Example 1. As can be seen from the graph, the decrease in gas pressure per unit time in Examples 1 and 2 is larger than the decrease in gas pressure in Comparative Example 1.

[0049] 4 is a graph showing the change in gas pressure inside the battery during pressure release when the pressure inside the battery increases in Example 3, Example 4, and Comparative Example 2. As can be seen from the graph, the decrease in gas pressure per unit time in Examples 3 and 4 is larger than the decrease in gas pressure in Comparative Example 2.

[0050] 5 is a graph showing the change in gas pressure inside the battery during pressure release when the pressure inside the battery increases in Example 5, Example 6, and Comparative Example 3. As can be seen from the graph, the decrease in gas pressure per unit time in Examples 5 and 6 is larger than the decrease in gas pressure in Comparative Example 3.

[0051] Therefore, based on Examples 1 to 6, in the range of values ​​of a, b, c, and α that the embodiments of the present disclosure are intended to protect, the orthogonal projection area S of the opening region 10 of the explosion-proof valve main body 100 can be effectively increased to increase the amount of gas discharged through the explosion-proof valve 200 per unit time, thereby improving the safety of the battery 300 that uses the explosion-proof valve 200.

[0052] In some embodiments, the length of the fissure 11 is defined as L, where L satisfies L=a+4c, i.e., the length of the fissure 11 includes the lengths of the two first fissures 111, the lengths of the two second fissures 112, and the length of the third fissure 113. The length of the first fissure 111 is the same as the length of the second fissure 112.

[0053] According to some embodiments of the present disclosure, referring to FIG. 1, the third cleft 113 extends in the length direction of the explosion-proof valve body 100. One of the first clefts 111 extends toward one side in the width direction of the explosion-proof valve body 100, and the other of the first clefts 111 extends toward another side in the width direction (e.g., vertical direction in FIG. 1) of the explosion-proof valve body 100. One of the second clefts 112 extends toward one side in the width direction of the explosion-proof valve body 100, and the other of the second clefts 112 extends toward another side in the width direction of the explosion-proof valve body 100. In this way, the lengths of the first crack 111, the second crack 112, and the third crack 113 in the explosion-proof valve body 100 can be relatively long, so that when the internal pressure of the battery 300 rises, the gas in the battery 300 can leak along the first crack 111, the second crack 112, and the third crack 113. Therefore, the area of ​​the opening of the explosion-proof valve body 100 can be effectively increased, thereby further improving the safety of using the explosion-proof valve 200.

[0054] Optionally, the fissure 11 is a centrosymmetric structure, that is, the two first fissures 111 and the two second fissures 112 are respectively symmetrically distributed in the length direction of the third fissure 113, and the two first fissures 111 and the two second fissures 112 are respectively symmetrically distributed in the width direction of the third fissure 113. Therefore, the distribution of the fissures 11 on the explosion-proof valve body 100 is increased, thereby realizing rapid pressure release.

[0055] In some embodiments, referring to FIG. 2, a notch 14 is formed in the explosion-proof valve body 100, and the notch 14 is formed with an open opening. The open opening is provided at an end facing away from the center of the explosion-proof valve body 100. A cleft 11 is formed in the bottom wall of the notch 14, and the cleft 11 and the open opening are located on the same side of the thickness direction of the bottom wall. The side wall of the cleft 11 away from the center of the explosion-proof valve body 100 is flush with the side wall of the notch 14 away from the center of the explosion-proof valve body 100. The cleft 11 is provided at the edge of the bottom wall of the notch 14, and the cleft 11 may extend in the circumferential direction of the notch 14, and it can be seen that the side wall of the cleft 11 on one side away from the center of the explosion-proof valve body 100 is the side wall of the notch 14.

[0056] Therefore, by forming the notch 14 in the explosion-proof valve body 100 and forming the cleft 11 in the bottom wall of the notch 14, the thickness of the cleft 11 and the thickness of the area defined in the cleft 11 can be reduced to facilitate the opening of the explosion-proof valve 200. In addition, the cleft 11 can be protected to avoid the unintentional opening of the explosion-proof valve 200 caused by an impact on the cleft 11.

[0057] In some specific embodiments, as shown in FIG. 2, the explosion-proof valve body 100 includes a connection part 20, a buffer part 30, and a support part 40. The connection part 20 is connected to the outer periphery side of the support part 40. The support part 40 is spaced apart from the connection part 20 in the thickness direction of the support part 40. The buffer part 30 is connected between the connection part 20 and the support part 40. For example, the connection part 20 and the support part 40 may both be horizontally disposed, and the connection part 20 is spaced apart from the support part 40 in the thickness direction of the explosion-proof valve body 100. One end of the buffer part 30 is connected to the inner periphery side of the connection part 20, and the other end of the buffer part 30 is connected to the outer periphery side of the support part 40. The connection part 20 of the explosion-proof valve body 100 may be connected to the housing or the cover plate by welding.

[0058] Therefore, by disposing the buffer part 30, the direction of stress transmission in the connection part 20 can be changed, and the stress can be prevented from being directly transmitted to the support part 40, thereby reducing the structural stability of the opening region 10. Specifically, for example, the buffer part 30 may be configured to absorb the thermal stress generated when the explosion-proof valve 200 is welded to the housing or cover plate of the battery 300, and to prevent the explosion-proof crack groove 11 from being broken due to thermal deformation during welding. In addition, the explosion-proof valve 200 can also be twisted in sync with the housing or cover plate to damage the explosion-proof crack groove 11 and prevent it from affecting the opening pressure of the explosion-proof valve 200.

[0059] Further, referring to FIG. 1, a fissure 11 is formed in the support 40, and an opening region 10 is formed in the support 40. The orthographic shape of the opening region 10 is non-circular. For example, the orthographic shape of the opening region 10 may be an oblong shape, which can make the area of ​​the opening region 10 relatively large. The outer contour of the orthographic projection of the opening region 10 includes two first straight lines 12 arranged parallel to each other, a first arc 13, and a second arc 132 opposite to the first arc 13. Each of the first straight lines 12 is connected to the first arc 13 and the second arc 132, respectively.

[0060] Optionally, the explosion-proof valve body 100 is an aluminum alloy part or a steel part. Therefore, the weight of the explosion-proof valve body 100 can be reduced, thereby realizing the lightweight design of the explosion-proof valve body 100. In addition, the aluminum alloy part or the steel part has good structural strength, and can improve the reliability of the explosion-proof valve body 100.

[0061] An embodiment of the second aspect of the present disclosure provides a battery 300, shown in FIG. 6, including an anti-explosion valve 200 according to an embodiment of the first aspect.

[0062] Specifically, the battery 300 further includes a housing (not shown) and a cover plate (not shown). At least one end of the housing is open for attaching the cover plate, and a mounting hole (not shown) is formed in the housing or the cover plate, and the explosion-proof valve 200 is connected to the mounting hole. The connection portion 20 of the explosion-proof valve 200 may be connected to the housing or the cover plate by welding.

[0063] According to the battery 300 of the embodiment of the present disclosure, by using the explosion-proof valve 200, both a reliable connection between the explosion-proof valve 200 and the battery 300 and good pressure release capability can be achieved, thereby improving the safety of using the battery 300.

[0064] In some embodiments, the energy density of the battery 300 is defined as E. E satisfies 200wh / kg≦E≦280wh / kg. For example, E=250wh / kg. However, the present disclosure is not limited thereto. Thus, the energy density of the battery 300 is increased, and the overall performance of the battery 300 is improved. Moreover, the higher the energy of the battery 300, the more active material or the higher the activity of the material is required inside the battery 300. Such a battery 300 requires a more accurate design of the amount of gas discharged through the explosion-proof valve 200 to ensure timely opening in extreme cases and avoid unintended start-up. The explosion-proof valve 200 of the above embodiment of the present disclosure can fully meet this requirement.

[0065] An embodiment of the third aspect of the present disclosure provides a battery module 400 shown in FIG. 6, which includes the battery 300 according to the embodiment of the second aspect.

[0066] Specifically, the battery module 400 may include a plurality of batteries 300 arranged side by side, and the plurality of batteries 300 may be connected in series or parallel. Thus, the use of the batteries 300 in the battery module 400 may improve the safety of the battery module 400. The battery module 400 may further include two end plates (not shown) and two side plates (not shown). The two end plates are distributed on two ends of each of the plurality of batteries 300 in a first direction. The two side plates are distributed on two sides of each of the plurality of batteries 300 in a second direction. The end plates and the side plates are fixedly connected to fix the battery 300. The first direction is perpendicular to the second direction. Of course, in other embodiments, the battery module 400 may further include two end plates and a cable tie (not shown), and the two end plates are distributed on two ends of each of the plurality of batteries 300 and fixed by the cable tie.

[0067] An embodiment of the fourth aspect of the present disclosure provides a battery pack 500 shown in FIG. 6 , which includes the battery 300 according to the embodiment of the second aspect or the battery module 400 according to the embodiment of the third aspect. Thus, by using the battery 300 or the battery module 400 in the battery pack 500, the safety of use of the battery pack 500 can be improved. For example, the battery pack 500 may include a tray, and the battery 300 or the battery module 400 is fixed in the tray. When the battery pack 500 is attached to the vehicle 600, the battery pack 500 is attached to the vehicle 600 via the tray.

[0068] An embodiment of the fifth aspect of the present disclosure provides a vehicle 600 shown in Figs. 6 to 8 including the battery 300 according to the embodiment of the second aspect or the battery pack 500 according to the embodiment of the fourth aspect. Thus, by using the battery pack 500 in the vehicle 600, the safety of use of the vehicle 600 can be improved. For example, in some embodiments, the battery 300 may be directly attached to the vehicle 600. In some other embodiments, the battery 300 is incorporated into the battery pack 500, and the battery pack 500 is attached to the vehicle 600.

[0069] In addition, when the battery pack 500 is attached to the vehicle 600, the explosion-proof valve 200 may be positioned facing downward to prevent the discharged hot gas from injuring passengers in the vehicle 600.

[0070] In describing the present disclosure, it should be understood that orientation or positional relationships indicated by terms such as "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" are used solely for ease and brevity of illustration and description, and do not indicate or imply that the devices or components referenced must have a particular orientation or be constructed and operated in a particular orientation based on the orientation or positional relationships shown in the accompanying drawings. Thus, such terms should not be construed as limiting the present disclosure.

[0071] In the present disclosure, a "first feature" and a "second feature" may include one or more features. In the present disclosure, "multiple" means two or more. In the present disclosure, a first feature being "above" or "below" a second feature may mean that the first feature and the second feature are in direct contact, or that the first feature and the second feature are not in direct contact, but are in contact through another feature between them. In the present disclosure, a first feature being "over," "above," and "in contact with" a second feature may include the first feature being directly above or diagonally above the second feature, or simply mean that the horizontal height of the first feature is higher than the horizontal height of the second feature.

[0072] In the description herein, references to terms such as "one embodiment," "some embodiments," "exemplary embodiments," "examples," "specific examples," or "some examples" mean that the specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of the present disclosure. As used herein, exemplary references to such terms do not necessarily refer to the same embodiment or example.

[0073] Although embodiments of the present disclosure have been illustrated and described, it should be understood that those skilled in the art could make various changes, modifications, substitutions, and variations 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 their equivalents. [Explanation of symbols]

[0074] 100 Explosion-proof valve body 10 Opening area 11 Fissure 111 First fissure 112 Second Fissure 113 Third Fissure 12 The First Straight Line 13 First Arc 131 Predetermined opening boundary 132 Second Arc 14 Notch 20 Connection 30 Buffer 40 Support part 200 Explosion-proof valve 300 Battery 400 Battery Module 500 Battery Pack 600 vehicles

Claims

1. An explosion-proof valve (200) comprising an explosion-proof valve body (100), The explosion-proof valve body (100) has a fissure (11), the fissure (11) comprises two first fissures (111), two second fissures (112), and a third fissure (113), one end of each of the two first fissures (111) and one end of each of the two second fissures (112) are connected to both ends of the third fissure (113), respectively, the other end of one of the two first fissures (111) extends away from the other end of the other of the two first fissures (111), and the other end of one of the two second fissures (112) extends away from the other end of the other of the two second fissures (112); The length of the third fissure (113) is defined as a, the distance between the other end of the first fissure (111) and the other end of the second fissure (112) is defined as b, the length of each of the first fissures (111) and the length of each of the second fissures (112) are equal and both are defined as c, the angle between the two first fissures (111) and the angle between the two second fissures (112) are equal and both are defined as α, the explosion-proof valve body (100) comprises an opening region (10), the outer edge of the orthogonal projection of the opening region (10) is a predetermined opening boundary (131) in the depth direction of the fissure (11), the area of ​​the orthogonal projection of the opening region (10) is defined as S, and S, c, and α are respectively: [0010] Fulfilling In the depth direction of the fissure (11), a first arc (13) is defined between the free ends of the orthogonal projections of the two first fissures (111), the first arc (13) is centered on the apex of the angle α between the two first fissures (111), a second arc (132) is defined between the free ends of the orthogonal projections of the two second fissures (112), the second arc (132) is centered on the apex of the angle α between the two first fissures (111), a first straight line (12) is defined between the free ends of the orthogonal projections of the first fissure (111) and the second fissure (112) on the same side of the third fissure (113), the first arc (13), the second arc (132) and the two first straight lines (12) together forming the predetermined aperture boundary (131); Explosion-proof valve (200).

2. 2. The explosion-proof valve (200) of claim 1, wherein c further satisfies c≦10 mm.

3. The explosion-proof valve (200) of claim 1 or 2, wherein α further satisfies α≦150°.

4. The explosion-proof valve (200) according to any one of claims 1 to 3, wherein a satisfies 10 mm≦a≦40 mm.

5. The explosion-proof valve (200) according to any one of claims 1 to 4, wherein b satisfies 15 mm≦b≦50 mm.

6. The explosion-proof valve (200) according to any one of claims 1 to 5, wherein the third groove (113) extends in the length direction of the explosion-proof valve body (100), one of the first grooves (111) extends toward one side of the width direction of the explosion-proof valve body (100) and the other of the first grooves (111) extends toward another side of the width direction of the explosion-proof valve body (100), and one of the second grooves (112) extends toward one side of the width direction of the explosion-proof valve body (100) and the other of the second grooves (112) extends toward the other side of the width direction of the explosion-proof valve body (100).

7. The explosion-proof valve (200) according to any one of claims 1 to 6, wherein the fissure (11) is of centrosymmetrical construction.

8. The explosion-proof valve (200) according to any one of claims 1 to 7, wherein a notch (14) is formed in the explosion-proof valve body (100), and the fissure (11) is formed in a bottom wall of the notch (14).

9. 9. The explosion-proof valve (200) of claim 8, wherein a side wall of the cleft (11) away from the center of the explosion-proof valve body (100) is flush with a side wall of the notch (14) away from the center of the explosion-proof valve body (100).

10. The explosion-proof valve (200) according to any one of claims 1 to 9, wherein the explosion-proof valve body (100) comprises a connection portion (20), a buffer portion (30), and a support portion (40), the connection portion (20) is connected to the outer circumferential side of the support portion (40), the support portion (40) is spaced from the connection portion (20) in the thickness direction of the support portion (40), the buffer portion (30) is connected between the connection portion (20) and the support portion (40), and the crack (11) is formed in the support portion (40).

11. The explosion-proof valve (200) according to any one of claims 1 to 10, wherein the explosion-proof valve body (100) has a flat plate structure.

12. The explosion-proof valve (200) according to any one of the preceding claims, wherein the opening area (10) is oblong.

13. The explosion-proof valve (200) according to any one of claims 1 to 12, wherein the explosion-proof valve body (100) is an aluminum alloy part or a steel part.

14. A battery (300) comprising an anti-explosion valve (200) according to any one of claims 1 to 13.

15. 15. The battery (300) of claim 14, wherein an energy density of the battery (300) is defined as E, where E satisfies 200wh / kg≦E≦280wh / kg.

16. A battery module (400) comprising a battery (300) according to claim 14 or 15.

17. A battery pack (500) comprising the battery (300) according to claim 14 or 15 or the battery module (400) according to claim 16.

18. A vehicle (600) comprising a battery (300) according to claim 14 or 15 or a battery pack (500) according to claim 17.

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