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

Abstract

A vehicle including a battery pack. The battery pack includes a battery or a battery module. The battery includes an explosion-proof valve. The explosion-proof valve includes an explosion-proof valve body. The explosion-proof valve body has an opening area, and the opening area is provided with an explosion-proof notch groove at its edge. The explosion-proof notch groove includes a first straight section, two arc sections, and at least one second straight section. Both ends of the first straight section are connected to the two arc sections, respectively, and at least one end of the second straight section is connected to the arc section, and the first straight section is arranged parallel to the second straight section. In the depth direction of the explosion-proof notch groove, the orthogonal projection of the opening area is a horizontally elongated shape. The outer edge of the orthogonal projection of the opening area is a predetermined opening boundary, and the area of ​​the orthogonal projection of the opening area is S, where S=a×b+π×b 2 / 4, S≧80mm 2 , and b≧6mm.

Description

[Technical field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to and the benefit of Chinese Patent Application No. 202221128931.6, filed on May 12, 2022. The entire contents of the above-mentioned application are incorporated herein by reference.

[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] In the related art, the explosion-proof valve of a battery is usually welded to the cover plate of the battery. When the gas pressure inside the battery exceeds the opening pressure of the explosion-proof valve, the explosion-proof valve can be opened to release the gas generated inside the battery, thereby preventing safety accidents such as battery explosion. However, if the pressure inside the battery changes and becomes too high, if the welding of the explosion-proof valve to the battery is unstable, the entire explosion-proof valve is likely to be blown open during pressure relief, affecting 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 related art. Therefore, the first objective of the present disclosure is to provide an explosion-proof valve, improve the stability of the explosion-proof valve after it is installed in a battery, increase the speed of pressure relief, and improve the use safety 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, the explosion-proof valve comprising: an explosion-proof valve body, the explosion-proof valve body having an opening region, an explosion-proof scored groove being provided on an edge of the opening region, the explosion-proof scored groove including a first straight segment, two arc segments, and at least one second straight segment, both ends of the first straight segment being connected to the two arc segments respectively, at least one end of the second straight segment being connected to the arc segment, and the first straight segment being arranged parallel to the second straight segment; in a depth direction of the explosion-proof scored groove, a shape of an orthographic projection of the opening region is oblong, an outer edge of the orthographic projection of the opening region is a predetermined opening boundary, an area of ​​the orthographic projection of the opening region is defined as S, and S, a, and b are expressed as S=a×b+π×b 2 / 4, S≧80mm 2 , a represents the length of the first straight line segment, b represents the distance between the outside of the first straight line segment and the outside of the second straight line segment, and b≧6 mm.

[0010] According to the explosion-proof valve of the embodiment of the present disclosure, the shape of the opening area of ​​the explosion-proof valve and the range of the length of the first straight line segment and the arc segment are defined to make the area of ​​the opening area more reasonable. When the internal pressure of the battery rises and needs to be released, the opening area may be opened in a timely manner, and the area S of the opening area may be ensured to increase the amount of gas discharged from the explosion-proof valve per unit time, so that the internal pressure of the battery may be released rapidly. In addition, by defining the area of ​​the opening area, the structural strength of the opening area of ​​the explosion-proof valve may be increased, so that the explosion-proof valve may be more stably installed, thereby reducing the possibility of safety-related accidents such as battery combustion and explosion caused by untimely pressure release.

[0011] In some instances, b further satisfies b<30 mm.

[0012] In some instances, a and b further satisfy a>b.

[0013] In some examples, a satisfies 8 mm≦a≦30 mm.

[0014] In some examples, the number of the second straight line segments is two, each of the second straight line segments is connected to a corresponding arc segment, and in the depth direction of the explosion-proof groove, the two free ends of the outer edge of the orthogonal projection of the explosion-proof groove are connected to form a connecting line, and the connecting line and the outer edge of the orthogonal projection of the explosion-proof groove jointly constitute a predetermined opening boundary.

[0015] In some examples, the length of the connecting line is defined as c1, and the score length of the explosion-proof score groove is defined as L1, where L1 and c1 satisfy L1=2a-c1+πb, and c1≧1 mm, respectively.

[0016] In some instances, c1 further satisfies c1≦10 mm.

[0017] In some examples, the number of the second straight line segments is one, both ends of the second straight line segment are respectively connected to two arc segments, the first straight line segment, the second straight line segment, and the two arc segments form a closed ring structure, and the outer edge of the orthogonal projection of the explosion-proof groove in the depth direction of the explosion-proof groove forms the predetermined opening boundary.

[0018] In some examples, the explosion-proof valve further includes a structural scored groove, the structural scored groove being disposed in the opening area, the structural scored groove being connected to the explosion-proof scored groove.

[0019] In some instances, in the explosion-proof groove depth direction, the depth of the structural groove is less than the depth of the explosion-proof groove.

[0020] In some examples, the structural grooves include X-shaped grooves or Y-shaped grooves.

[0021] In some examples, when the structural groove includes a Y-shaped groove, the Y-shaped groove includes one first groove and two second grooves, one end of the first groove is connected to one end of each of the two second grooves, the other ends of the two second grooves in a direction away from the first groove extend away from each other, and at least one of the other ends of the first groove and the two second grooves is connected to the explosion-proof groove, a length of the first groove is defined as d, a length of each of the second grooves is defined as c2, and a length of the Y-shaped groove is defined as L2, where L2, c2, and d satisfy L2=d+2c2, 5mm≦c2≦30mm, and 5mm≦d≦30mm.

[0022] In some examples, the angle between two second grooves is defined as α, where α satisfies 30°≦α≦150°.

[0023] In some examples, the explosion-proof valve body includes a connecting section, a buffer section, and a support section, the connecting section being connected to an outer periphery of the support section, the support section being spaced apart from the connecting section in a thickness direction of the support section, the buffer section being connected between the connecting section and the support section, and the opening area being provided on the support section.

[0024] In some examples, a recess is formed on the explosion-proof valve body, an explosion-proof groove is formed on a bottom wall of the recess, and a sidewall of the explosion-proof groove away from the center of the explosion-proof valve body is flush with a sidewall of the recess away from the center of the explosion-proof valve body.

[0025] An embodiment of the second aspect of the present disclosure provides a battery including an anti-explosion valve according to an embodiment of the first aspect.

[0026] In some examples, the energy density of the battery is defined as E, where E satisfies 200wh / kg≦E≦280wh / kg.

[0027] An embodiment of a third aspect of the present disclosure provides a battery module including a battery according to an embodiment of the second aspect.

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

[0029] An embodiment of the fifth aspect of the present disclosure provides a vehicle, comprising a battery according to an embodiment of the second aspect or a battery pack according to an embodiment of the fourth aspect.

[0030] Additional aspects and advantages of the disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosure.

[0031] 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]

[0032] [Figure 1] FIG. 1 is a schematic diagram of an explosion-proof valve according to one embodiment of the present disclosure. [Diagram 2] FIG. 13 is a schematic diagram of an explosion-proof valve according to another embodiment of the present disclosure. [Diagram 3] FIG. 13 is a schematic diagram of an explosion-proof valve according to yet another embodiment of the present disclosure. [Figure 4] 1 is a schematic cross-sectional view of an explosion-proof valve according to one embodiment of the present disclosure. [Diagram 5] FIG. 2 is a schematic diagram showing a comparison between the pressure relief rates of the batteries of Comparative Example 1, Example 1, and Example 2 according to the present disclosure. [Figure 6] FIG. 1 is a schematic diagram showing a comparison between the pressure relief rates of the batteries of Comparative Example 2, Example 3, and Example 4 according to the present disclosure. [Figure 7] FIG. 1 is a schematic diagram showing a comparison between the pressure relief rates of the batteries of Comparative Example 3, Example 5, and Example 6 according to the present disclosure. [Figure 8] 1 is a schematic diagram of a vehicle according to one embodiment of the present disclosure. [Figure 9] FIG. 2 is a schematic diagram of a vehicle according to another embodiment of the present disclosure. [Figure 10] FIG. 2 is a schematic diagram of a vehicle according to yet another embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0033] 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 to 4. 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 is used to release the pressure of the battery 300 when the internal pressure of the battery 300 rises.

[0034] As shown in FIGS. 1 to 4, one embodiment of a first aspect of the present disclosure provides an explosion-proof valve 200 including an explosion-proof valve body 100.

[0035] Specifically, referring to FIG. 1 to FIG. 3, the explosion-proof valve body 100 has an opening region 10. When the explosion-proof valve 200 is applied to the battery 300 and the pressure inside the battery 300 rises, the gas inside the battery 300 can be smoothly discharged through the opening region 10 of the explosion-proof valve 200. An explosion-proof groove 11 is provided on the edge of the opening region 10. The outer edge of the orthogonal projection of the opening region 10 is a predetermined opening boundary 101. In the depth direction of the explosion-proof groove 11, the orthogonal projection shape of the opening region 10 is horizontally elongated. Therefore, the horizontally elongated shape can relatively increase the area of ​​the opening region 10. For example, the explosion-proof valve 200 may be disposed on one side of the housing of the rectangular battery 300. The horizontally elongated opening region 10 can better fit the shape of the housing of the battery 300, so that the area S of the orthogonal projection of the opening region 10 may be increased, and therefore the amount of gas discharged may be increased. The depth direction of the explosion-proof groove 11 may be understood as the direction from the groove opening of the explosion-proof groove 11 to the groove bottom.

[0036] 1 to 3, the thickness of the explosion-proof groove 11 corresponding to the opening region 10 is smaller than the thickness of the other parts of the opening region 10. That is, the thickness of the bottom wall of the explosion-proof groove 11 is smaller than the thickness of the other parts of the opening region 10. Therefore, by disposing the explosion-proof groove 11 at the edge of the opening region 10, when the internal pressure of the battery 300 rises and needs to be released through the explosion-proof valve 200, the explosion-proof valve 200 can be preferentially broken at the explosion-proof groove 11, so as to effectively avoid the situation where the opening region 10 cannot be opened normally or the entire explosion-proof valve 200 is pushed open, thereby realizing smooth pressure release and improving the safety of the battery 300 and the entire battery system.

[0037] The explosion-proof groove 11 includes a first straight line segment 111, two arc segments 113, and at least one second straight line segment 112. Both ends of the first straight line segment 111 are connected to the two arc segments 113, respectively. At least one end of the second straight line segment 112 is connected to the arc segment 113. The first straight line segment 111 is arranged parallel to the second straight line segment 112. That is, when the number of the second straight line segments 112 is two, the two second straight line segments 112 are connected to the two arc segments 113, respectively. When the number of the second straight line segments 112 is one, both ends of the second straight line segment 112 are connected to the two arc segments 113, respectively. The length of the first straight line segment 111 is defined as a, and the distance between the outside of the first straight line segment 111 and the outside of the second straight line segment 112 is defined as b. In the depth direction of the explosion-proof groove 11, the area of ​​the orthogonal projection of the opening region 10 is defined as S. S, a, and b are expressed as S=a×b+π×b 2 / 4, S≧80mm 2 , and b≧6mm, respectively.

[0038] It can be understood that the outside of the first straight line segment 111 is the side of the first straight line segment 111 that is away from the center of the explosion-proof valve 200, and the outside of the second straight line segment 112 is the side of the second straight line segment 112 that is away from the center of the explosion-proof valve 200. The cross-sectional boundary of the explosion-proof groove 11 may be rectangular or inverted trapezoid. "Cross-section" in this specification means a plane parallel to the depth direction of the explosion-proof groove 11. When the cross-section of the explosion-proof groove 11 is an inverted trapezoid, the width of the explosion-proof groove 11 gradually decreases in the direction from the groove opening to the groove bottom of the explosion-proof groove 11. In this case, a can be understood as the length of the outer edge of the first straight line segment 111 at the top or opening of the groove, and b can be understood as the diameter of the outer edge of the arc segment 113 at the top or opening of the groove. In other words, in the depth direction of the explosion-proof groove 11 (i.e., in the direction from the groove opening to the groove bottom of the explosion-proof groove 11), the outer edge of the orthogonal projection of the explosion-proof groove 11 includes two semicircles on both sides, b can be understood as the diameter of the semicircles, and a can be understood as the distance between the centers of the two semicircles. The orthogonal projection area S of the opening region 10 may include the areas of the two semicircles with diameter b, and the area of ​​a rectangle with length a and width b, and the two semicircles are respectively connected to both ends in the length direction of the rectangle.

[0039] Specifically, S≧80mm 2 and b≧6mm, the area of ​​the opening area 10 is controlled to ensure that the area of ​​the opening area 10 meets the requirements of the battery 300 for the pressure relief capability of the explosion-proof valve 200, thereby realizing smooth pressure relief. S<80mm 2If so, the area of ​​the opening region 10 is small, the amount of gas discharged from the explosion-proof valve 200 per unit time is insufficient, and the explosion-proof valve 200 may not be able to release pressure in a timely manner, resulting in the possibility that the increased pressure inside the battery 300 will push open the explosion-proof valve 200 and affect other battery systems, thereby reducing the safety of the use of the battery 300. Therefore, S and b within the above value ranges can not only satisfy the area of ​​the opening region 10, but also ensure the structural stability of the explosion-proof valve 200.

[0040] According to the explosion-proof valve 200 of the embodiment of the present disclosure, the shape of the opening area 10 of the explosion-proof valve 200 and the range of the area S of the orthogonal projection of the opening area 10 are defined to make the area of ​​the opening area 10 more reasonable. When the explosion-proof valve 200 is applied to the battery 300, and the internal pressure of the battery 300 rises and needs to be released, the opening area 10 may be opened in a timely manner, and the area S of the opening area 10 may be effectively ensured to increase the amount of gas discharged from the explosion-proof valve 200 per unit time, so that the internal pressure of the battery 300 may be rapidly released. In addition, by defining the range of the values ​​of S and b, not only may the area S of the opening area 10 be satisfied to smoothly release pressure, but also the structural strength of the explosion-proof valve 200 may be improved, thereby improving the reliability and operational life of the explosion-proof valve 200 installed in the battery 300.

[0041] In some embodiments, the distance b between the outside of the first straight segment 111 and the outside of the second straight segment 112 is less than 30 mm. Therefore, when the total area of ​​the explosion-proof valve 200 is constant, this can effectively prevent the opening area 10 from occupying an excessively large area of ​​the explosion-proof valve 200, which results in the structural stability of the explosion-proof valve 200 being reduced and the opening area 10 being easily opened unintentionally, thereby affecting the service life of the explosion-proof valve 200.

[0042] In some embodiments, the length of the first straight segment 111 is defined as a, and the distance between the outside of the first straight segment 111 and the outside of the second straight segment 112 is defined as b, where a>b, and a and b are both measured in mm. Such a configuration facilitates the manufacture of the explosion-proof scored groove 11.

[0043] In some embodiments, the length of the first straight segment 111 satisfies 8 mm≦a≦30 mm. Such a configuration can ensure that the explosion-proof valve 200 has a sufficient area of ​​the opening area and the area of ​​the opening is not excessively large. When the total area of ​​the explosion-proof valve 200 is constant, this can effectively prevent the opening area 10 from occupying an excessively large area of ​​the explosion-proof valve 200, which results in the structural stability of the explosion-proof valve 200 being reduced and the opening area 10 being easily opened unintentionally, thereby affecting the service life of the explosion-proof valve 200.

[0044] In some embodiments, as shown in FIG. 1, the length of the first straight segment 111 is defined as a, and the distance between the outside of the first straight segment 111 and the outside of the second straight segment 112 is defined as b, where a and b satisfy a>b, 8mm≦a≦30mm, and b<30mm. In other words, the length of the opening area 10 (from left to right in FIG. 1) is greater than the width of the opening area 10 (vertical direction in FIG. 1), ensuring that the opening area 10 is oblong, so that the opening area 10 can cooperate with the explosion-proof valve body 100 to increase the area S of the orthogonal projection of the opening area 10. In addition, by defining the range of a and b, a reasonable area of ​​the opening area 10 can be formed, which can enhance the structural strength of the opening area 10 and facilitate the timely release of the elevated pressure inside the battery 300 from the opening area 10, thereby improving the use safety of the battery 300.

[0045] In some embodiments, as shown in FIG. 1 and FIG. 2, the explosion-proof groove 11 includes a first straight line segment 111, two arc segments 113 arranged on both sides, and two second straight line segments 112 spaced apart from each other. The first straight line segment 111 is arranged parallel to the second straight line segment 112. Both ends of the first straight line segment 111 are connected to the two arc segments 113, respectively, and each of the second straight line segments 112 is connected to the corresponding arc segment 113. In the depth direction of the explosion-proof groove 11, the two free ends of the outer edge of the orthogonal projection of the explosion-proof groove 11 are connected to form a connecting line 114. That is, the line connecting the side edges of the two second straight line segments 112 that are away from the center of the explosion-proof valve 200 is the connecting line 114. The connecting line 114 and the outer edge of the orthogonal projection of the explosion-proof groove 11 jointly constitute a predetermined opening boundary 101. In this case, the area of ​​the region defined within the predetermined opening boundary 101 (i.e., the area of ​​the orthogonal projection of the opening region 24 in the depth direction of the explosion-proof groove 11) is defined as S1, where S1=a×b+π×b 2 / 4, and the total length of the explosion-proof groove 11 is defined as L1, where L1 = 2a - c1 + πb, where a represents the length of the first straight line segment 111, b represents the distance between the outside of the first straight line segment 111 and the outside of the second straight line segment 112, and c1 represents the distance between the two second straight line segments 112, i.e., the length of the connecting line 114.

[0046] Optionally, 1 mm≦c1≦10 mm. However, the present disclosure is not limited thereto. Therefore, by defining the distance c1 between the two second straight segments 112, the structural strength of the opening area 10 may be relatively enhanced to enhance the opening stability of the opening area 10, so that the opening area 10 is less likely to fall off the explosion-proof valve 200 during pressure relief and cause secondary injury. In addition, by making the explosion-proof notched groove 11 have a specific notch length L1, the opening area 10 can be opened smoothly, thereby further improving the safety of the battery 300.

[0047] In some other specific embodiments, as shown in FIG. 3, the explosion-proof groove 11 includes a first straight line segment 111, a second straight line segment 112, and two arc segments 113 arranged on both sides. The number of the second straight line segment 112 is one, the first straight line segment 111 is arranged in parallel with the second straight line segment 112, and both ends of each of the first straight line segment 111 and the second straight line segment 112 are respectively connected to the two arc segments 113. The first straight line segment 111, the second straight line segment 112, and the two arc segments 113 form a closed ring structure. The outer edge of the orthogonal projection of the explosion-proof groove 11 in the depth direction of the explosion-proof groove 11 constitutes the predetermined opening boundary 101. In this case, the explosion-proof groove 11 extends in the circumferential direction of the opening region 10 to form a closed ring shape. In this case, the area of ​​the predetermined aperture boundary 101 is defined as S2, where S2=a×b+π×b 2 / 4, where a represents the length of the first straight segment, and b represents the distance between the outside of the first straight segment 111 and the outside of the second straight segment 112. Thus, it is ensured that the explosion-proof valve 200 can be opened with the explosion-proof groove while releasing the pressure, so that the pressure can be released from the explosion-proof valve 200 in a timely manner, thereby improving the timeliness of the explosion-proof valve 200.

[0048] It should be noted that the cross-sectional boundary of the explosion-proof groove 11 may be rectangular or inverted trapezoid. In this specification, "cross-section" means a plane parallel to the depth direction of the explosion-proof groove 11. When the cross-section of the explosion-proof groove 11 is an inverted trapezoid, the width of the explosion-proof groove 11 gradually decreases toward the groove bottom of the explosion-proof groove 11. In this case, a can be understood as the length of the outer edge of the first straight line segment 111 at the top or opening of the groove, and b can be understood as the diameter of the outer edge of the arc segment 113 at the top or opening of the groove. In other words, in the depth direction of the explosion-proof groove 11 (i.e., in the direction from the groove opening to the groove bottom of the explosion-proof groove 11), the outer edge of the orthogonal projection of the explosion-proof groove 11 includes two semicircles on both sides, b can be understood as the diameter of the semicircles, and a can be understood as the distance between the centers of the two semicircles.

[0049] Comparative Examples 1-3 (i.e., related art) and Examples 1-6 (i.e., embodiments of the present disclosure) are described below. The batteries in Comparative Examples 1-3 and the batteries 300 in Examples 1-6 were tested using the method specified in GB / T31485-2015, respectively, and the pressure relief rate curves of the corresponding batteries were recorded. The opening area S, the length a of the first straight segment, and the distance b between the outside of the first straight segment and the outside of the second straight segment in Comparative Examples 1-3 were selected from Table 2 below. The opening area S, the length a of the first straight segment, and the distance b between the outside of the first straight segment and the outside of the second straight segment in Examples 1-6 were selected from Table 1 below. The final test results are shown in Figures 5-7. Table 1 shows the values ​​of a and b, as well as the corresponding values ​​of S, in six different Examples (i.e., Examples 1-6) of the present disclosure, where the ranges of the values ​​of a and b basically increase gradually, and S also shows an overall increasing trend. Table 2 shows the values ​​of a and b in three comparative examples (i.e., Comparative Examples 1 to 3) and the corresponding values ​​of S. The values ​​of a and b in Comparative Examples 1 to 3 are less than the values ​​of a and b in Examples 1 to 6, respectively, and correspondingly, the values ​​of S in Comparative Examples 1 to 3 are less than the values ​​of S in Examples 1 to 6.

[0050] [Table 1]

[0051] [Table 2]

[0052] 5 is a graph showing the variation of the gas pressure inside the battery 300 during pressure relief when the pressure inside the battery 300 is increased 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 greater than the decrease in gas pressure in Comparative Example 1.

[0053] 6 is a graph showing the variation of the gas pressure inside the battery 300 during pressure relief when the pressure inside the battery 300 is increased 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 greater than the decrease in gas pressure in Comparative Example 2.

[0054] 7 is a graph showing the variation of the gas pressure inside the battery 300 during pressure relief when the pressure inside the battery 300 is increased 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 greater than the decrease in gas pressure in Comparative Example 3.

[0055] Therefore, based on Examples 1 to 6 having the range of values ​​of a and b that the embodiments of the present disclosure are intended to protect, the area of ​​the opening of the opening region 10 can be effectively increased to increase the amount of gas discharged from the explosion-proof valve 200 per unit time, thereby improving the safety of the battery 300 using the explosion-proof valve 200.

[0056] Further, referring to FIG. 2-FIG. 3, the explosion-proof valve 200 further includes a structural groove 12. The structural groove 12 is provided in the opening region 10, and the structural groove 12 is connected to the explosion-proof groove 11. The structural groove 12 and the explosion-proof groove 11 may both be located on the same side of the opening region 10. With such a configuration, the structural groove 12 can increase the structural strength of the opening region 10, and therefore, when the opening region 10 is exposed to the internal pressure of the battery 300, the structural groove 12 can deform itself to increase the pressure bearing capability of the inside of the explosion-proof valve 200. For example, when the internal pressure of the battery 300 increases, the internal pressure of the battery 300 presses the opening region 10 outward, causing the opening region 10 to deform. The structural notch 12 can enhance the deformation of the opening region 10 to a certain extent, relatively improve the structural strength of the opening region 10, and thereby effectively prevent the explosion-proof valve 200 from being unintentionally opened. Therefore, by disposing the structural notch 12 in the opening region 10, the structural strength of the opening region 10 can be improved, the explosion-proof valve 200 can be prevented from being unintentionally opened, and the deformation of the explosion-proof valve 200 during long-term use can be effectively prevented, thereby improving the stability and service life of the explosion-proof valve 200.

[0057] In some embodiments, in the depth direction of the explosion-proof groove 11, the depth of the structural groove 12 may be less than the depth of the explosion-proof groove 11. In the thickness direction of the explosion-proof valve 200, the thickness of the opening region 10 at the position corresponding to the structural groove 12 is greater than the thickness of the opening region 10 at the position corresponding to the explosion-proof groove 11. Such a configuration can effectively increase the stability of the opening region 10, and the relatively deep explosion-proof groove 11 is conducive to the smooth opening of the explosion-proof valve 200 while protecting the explosion-proof valve 200.

[0058] Optionally, as shown in Figures 2 and 3, the structural groove 12 includes an X-shaped groove 121 or a Y-shaped groove 122, etc. When the shape of the structural groove 12 is the X-shaped groove 121, an "X"-shaped structural groove 12 is formed in the opening region 10. When the shape of the structural groove 12 is the Y-shaped groove 122, a "Y"-shaped structural groove 12 is formed in the opening region 10.

[0059] 2, when the structural groove 12 includes an X-shaped groove 121, the X-shaped groove includes two arc-shaped grooves 1211. The two arc-shaped grooves 1211 are connected to each other with their openings facing away from each other. In the explosion-proof valve 200 having the X-shaped groove 121, the distance between the outside of the first straight segment 111 and the outside of the second straight segment 112 is defined as b, the length of the first straight segment 111 is defined as a, and the length of the explosion-proof groove 11 of the explosion-proof valve 200 having the X-shaped groove 121 is defined as L2. L2 and c1 respectively satisfy L2=2a-c1+πb, and 1mm≦c1≦10mm. However, the present disclosure is not limited thereto.

[0060] 3, when the structural groove 12 includes a Y-shaped groove 122, the Y-shaped groove 122 includes one first groove 1221 and two second grooves 1222. One end of the first groove 1221 is connected to one end of each of the two second grooves 1222. In a direction away from the first groove 1221, the other ends of the two second grooves 1222 extend away from each other, and an angle is formed between the two second grooves 1222. For example, the two second grooves 1222 may be symmetrically distributed with respect to the first groove 1221. At least one of the other ends of the first groove 1221 and the two second grooves 1222 is connected to the explosion-proof groove 11. Optionally, an end of the first knurled groove 1221 remote from the second knurled groove 1222 and an end of each second knurled groove 1222 remote from the first knurled groove 1221 may both communicate with the explosion-proof knurled groove 11. The length of the first knurled groove 1221 is defined as d, the length of each of the second knurled grooves 1222 is defined as c2, and the knurled length of the Y-shaped knurled groove 122 is defined as L2, where L2, c2, and d satisfy L2=d+2c2, 5mm≦c2≦30mm, and 5mm≦d≦30mm.

[0061] Therefore, by providing the first groove 1221 and the second groove 1222 and defining the range of values ​​of the length of the first groove 1221 and the second groove 1222, when the internal pressure of the battery 300 rises, the Y-shaped groove 122 is deformed, and the opening area 10 forms a suitable area S of the opening for releasing the pressure. This can also avoid a situation where the length of the Y-shaped groove 122 is too small, which leads to a weak structural strength of the Y-shaped groove, which may result in unintentional opening. Alternatively, this can avoid a situation where at least one of the values ​​of c2 and d is too large, which causes the opening area 10 to be pushed open when the increased pressure inside the battery 300 does not reach a predetermined pressure, which results in a reduction in the pressure release ability of the explosion-proof valve 200.

[0062] Optionally, as shown in FIG. 3, the angle between the two second notched grooves 1222 is defined as α. α satisfies 30°≦α≦150°. For example, α=90°. Therefore, by defining the value range of α, the two second notched grooves 1222 can be distributed approximately evenly in the opening region 10, so that the structural strength of the explosion-proof valve 200 can be improved relatively evenly, thereby better preventing the explosion-proof valve 200 from being unintentionally opened.

[0063] According to some specific embodiments of the present disclosure, as shown in FIG. 3 and FIG. 4, the explosion-proof valve body 100 includes a connection area 20, a buffer area 30, and a support area 40. The connection area 20 is connected to the outer periphery side of the support area 40. The support area 40 is separated from the connection area 20 in the thickness direction of the support area 40. The buffer area 30 is connected between the connection area 20 and the support area 40. For example, the connection area 20 and the support area 40 may both be horizontally arranged, and the connection area 20 is separated from the support area 40 in the thickness direction of the explosion-proof valve body 100. One end of the buffer area 30 is connected to the inner periphery side of the connection area 20, and the other end of the buffer area 30 is connected to the outer periphery side of the support area 40. The thickness direction of the support area 40 may coincide with the depth direction of the explosion-proof groove 11.

[0064] Therefore, by disposing the buffer area 30, the direction of stress transmission of the connection area 20 can be changed to prevent the stress from being directly transmitted to the support area 40, which leads to a decrease in the structural stability of the opening area 10. For example, the buffer area 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 prevent the explosion-proof groove 11 from being damaged by thermal deformation during welding. In addition, the explosion-proof valve 200 may also be prevented from being twisted in sync with the housing or cover plate, which would damage the explosion-proof groove 11 and affect the opening pressure of the explosion-proof valve 200.

[0065] In some embodiments, referring to FIG. 4, a recess 41 is formed in the support area 40. The recess 41 is formed with an open opening. The open opening is provided on the side facing the connection area 20. The explosion-proof groove 11 is formed on the bottom wall of the recess 41, and the explosion-proof groove 11 and the open opening are located on the same side in the thickness direction of the bottom wall. The side wall of the explosion-proof groove 11 away from the center of the explosion-proof valve body 100 is flush with the side wall of the recess 41 away from the center of the explosion-proof valve body 100. The explosion-proof groove 11 is provided on the edge of the bottom wall of the recess 41, and the explosion-proof groove 11 may extend in the circumferential direction of the recess 41, and it can be understood that the side wall of one side of the explosion-proof groove 11 away from the center of the explosion-proof valve body 100 is the side wall of the recess 41.

[0066] Therefore, by forming the recess 41 on the explosion-proof valve body 100 and forming the explosion-proof groove 11 on the bottom wall of the recess 41, the thickness of the explosion-proof groove 11 and the thickness of the area defined in the explosion-proof groove 11 can be reduced to facilitate the opening of the opening area 10. In addition, the explosion-proof groove 11 can be protected to avoid unintentional opening of the opening area 10 caused by impact against the explosion-proof groove 11.

[0067] Optionally, the support area 40 may be closer to the center of the battery 300 than the connecting area 20, and therefore the explosion-proof valve 200 is recessed toward the inside of the battery 300 as a whole, thereby effectively avoiding abnormal opening of the opening area 10 due to the impact of an external force on the opening area 10.

[0068] Additionally, the open area 10 may be provided with a support section 40. The support section 40 may increase the structural strength of the open area 10 and provide support for the open area 10.

[0069] In some embodiments, the explosion-proof valve body 100 is an aluminum alloy part or a steel part. Such a configuration can reduce the weight of the explosion-proof valve body 100, thereby realizing a lightweight design of the explosion-proof valve body 100. In addition, the aluminum alloy part or the steel part has good structural strength, which can increase the reliability of the explosion-proof valve body 100.

[0070] An embodiment of the second aspect of the present disclosure provides a battery 300 including an anti-explosion valve 200 according to an embodiment of the first aspect.

[0071] 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 mounting the cover plate, 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 area 20 of the explosion-proof valve 200 may be connected to the housing or the cover plate by welding. When the explosion-proof valve body 100 is fixed to the housing or the cover plate of the battery 300 by welding, the connection area 20 and a part of the housing or the cover plate jointly form a welded seam. In this case, the connection area 20 is an orthogonal projection of the welded seam in the explosion-proof valve body 100, and the edge of the explosion-proof valve body 100 may be at a position half the width of the welded seam formed by welding the explosion-proof valve 200 to the battery 300 (e.g., the housing or the cover plate).

[0072] 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 relief capability can be achieved, and the use safety of the battery 300 can also be improved.

[0073] 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. Furthermore, the higher the energy of the battery 300, the more active material, or the higher 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 from the explosion-proof valve 200 to ensure timely opening in extreme cases and avoid unintended initiation. The explosion-proof valve 200 of the above embodiment of the present disclosure can fully meet this requirement.

[0074] An embodiment of the third aspect of the present disclosure provides a battery module 400 including a battery 300 according to an embodiment of the second aspect.

[0075] 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. In the description of the present disclosure, "multiple" and "a plurality of" mean two or more. 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 both 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 batteries 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), where the two end plates are distributed at both ends of each of the plurality of batteries 300 and secured by the cable tie.

[0076] An embodiment of the fourth aspect of the present disclosure provides a battery pack 500 including 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 to the tray. When the battery pack 500 is applied to a vehicle 600, the battery pack 500 is attached to the vehicle 600 through the tray.

[0077] An embodiment of the fifth aspect of the present disclosure provides a vehicle 600, which includes the battery 300 according to the embodiment of the second aspect or the battery pack 500 according to the embodiment of the fourth aspect, as shown in Figs. 8 to 10. 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 assembled into the battery pack 500, and the battery pack 500 is attached to the vehicle 600.

[0078] In addition, when the battery pack 500 is applied to the vehicle 600, the explosion-proof valve 200 may be arranged to face downward to prevent the discharged hot gas from injuring passengers inside the vehicle 600.

[0079] 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," "axial," "radial," and "circumferential" are based on the orientations or positions illustrated in the accompanying drawings and are used solely for ease and brevity of illustration and description, rather than indicating or implying that the devices or components being described need have a particular orientation or be constructed and operated in a particular orientation. Thus, such terms should not be construed as limitations of the present disclosure.

[0080] In the present disclosure, a "first feature" and a "second feature" may include one or more features. 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.

[0081] In the description herein, references to terms such as "one embodiment," "some embodiments," "exemplary embodiments," "examples," "particular 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. In the present specification, exemplary references to such terms do not necessarily refer to the same embodiment or example.

[0082] While embodiments of the present disclosure have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the present disclosure, the scope of the present disclosure being as defined by the appended claims and their equivalents. [Explanation of symbols]

[0083] 100 Explosion-proof valve body 200 Explosion-proof valve 300 batteries 400 Battery Module 500 Battery Packs 600 vehicles 10 Opening area 101 Predetermined opening boundary 11 Explosion-proof groove 111 First straight line segment 112 Second Line Segment 113 Arc Segment 114 Connecting Line 12 Structural groove 121 X-shaped groove 1211 Circular groove 122 Y-shaped groove 1221 First groove 1222 Second groove 20 Connected area 30 Buffer area 40 Support area 41 Recess

Claims

1. An explosion-proof valve (200), An explosion-proof valve body (100), the explosion-proof valve body (100) having an opening region (10), an explosion-proof groove (11) provided on an edge of the opening region (10), the explosion-proof groove (11) comprising a first straight line segment (111), two arc segments (113), and at least one second straight line segment (112), both ends of the first straight line segment (111) being connected to the two arc segments (113), respectively, at least one end of the second straight line segment (112) being connected to the arc segment (113), and the first straight line segment (111) being arranged parallel to the second straight line segment (112); In the depth direction of the explosion-proof groove (11), the shape of the orthogonal projection of the opening region (10) is horizontally elongated, the outer edge of the orthogonal projection of the opening region (10) is a predetermined opening boundary (101), the area of ​​the orthogonal projection of the opening region (10) is defined as S, and S, a, and b are expressed as S=a×b+π×b ２ / 4, S≧80mm ２ , a represents the length of the first straight segment (111), b represents the distance between the outside of the first straight segment (111) and the outside of the second straight segment (112), and b≧6 mm.

2. 2. The explosion-proof valve (200) of claim 1, wherein b further satisfies b<30 mm.

3. The explosion-proof valve (200) according to claim 1 or 2, wherein a and b further satisfy a>b.

4. The explosion-proof valve (200) according to any one of claims 1 to 3, wherein a satisfies 8 mm≦a≦30 mm.

5. the number of second straight line segments (112) is two, and each of the second straight line segments (112) is connected to a corresponding arc segment (113); The explosion-proof valve (200) according to any one of claims 1 to 4, wherein in the depth direction of the explosion-proof groove (11), two free ends of the outer edge of the orthogonal projection of the explosion-proof groove (11) are connected to form a connecting line (114), and the connecting line (114) and the outer edge of the orthogonal projection of the explosion-proof groove (11) jointly constitute the predetermined opening boundary (101).

6. The length of the connecting line (114) is c １ and the length of the explosion-proof groove (11) is L １ is defined as L １ and c １ But, L １ = 2a-c １ +πb, and c １ 6. The explosion-proof valve (200) of claim 5, wherein each of the above dimensions satisfies ≧1 mm.

7. c １ But, １ The explosion-proof valve (200) of claim 6, further comprising: ≦10 mm.

8. the number of second straight line segments (112) is one, both ends of the second straight line segment (112) are connected to the two arc segments (113), respectively, and the first straight line segment (111), the second straight line segment (112), and the two arc segments (113) form a closed ring structure; The explosion-proof valve (200) according to any one of claims 1 to 4, wherein an outer edge of an orthogonal projection of the explosion-proof groove (11) in the depth direction of the explosion-proof groove (11) constitutes the predetermined opening boundary (101).

9. The explosion-proof valve (200) according to any one of claims 1 to 8, further comprising a structural groove (12), the structural groove (12) being provided in the opening region (10), the structural groove (12) being connected to the explosion-proof groove (11).

10. The explosion-proof valve (200) according to claim 9, wherein in the depth direction of the explosion-proof groove (11), the depth of the structural groove (12) is smaller than the depth of the explosion-proof groove (11).

11. The explosion-proof valve (200) of claim 10, wherein the structural groove (12) comprises an X-shaped groove (121) or a Y-shaped groove (122).

12. When the structural groove (12) comprises the Y-shaped groove (122), the Y-shaped groove (122) comprises one first groove (1221) and two second grooves (1222), one end of the first groove (1221) is connected to one end of each of the two second grooves (1222), the other ends of the two second grooves (1222) in a direction away from the first groove (1221) extend away from each other, and at least one of the other ends of the first groove (1221) and the other ends of the two second grooves (1222) are connected to the explosion-proof groove (11); The length of the first groove (1221) is defined as d, and the length of each of the second grooves (1222) is c ２ and the length of the Y-shaped groove (122) is L ２ is defined as L ２ , c ２ , and d is L ２ = d + 2c ２ , 5mm≦c ２ 12. The explosion-proof valve (200) of claim 11, wherein d is greater than or equal to 30 mm, and 5 mm≦d≦30 mm.

13. 13. The explosion-proof valve (200) of claim 12, wherein an angle between the two second grooves (1222) is defined as α, where α satisfies 30°≦α≦150°.

14. 14. The explosion-proof valve (200) according to any one of claims 1 to 13, wherein the explosion-proof valve body (100) comprises a connecting section (20), a buffer section (30), and a support section (40), the connecting section (20) being connected to the outer periphery of the support section (40), the support section (40) being spaced from the connecting section (20) in the thickness direction of the support section (40), the buffer section (30) being connected between the connecting section (20) and the support section (40), and the opening region (10) being provided on the support section (40).

15. 14. The explosion-proof valve (200) according to any one of claims 1 to 13, wherein a recess (41) is formed on the explosion-proof valve body (100), the explosion-proof groove (11) is formed on a bottom wall of the recess (41), and a side wall of the explosion-proof groove (11) away from the center of the explosion-proof valve body (100) is flush with a side wall of the recess (41) away from the center of the explosion-proof valve body (100).

16. A battery (300) comprising an explosion-proof valve (200) according to any one of claims 1 to 15.

17. 17. The battery (300) of claim 16, wherein the energy density of the battery (300) is defined as E, where E satisfies 200wh / kg≦E≦280wh / kg.

18. A battery module (400) comprising a battery (300) according to claim 16 or 17.

19. A battery pack (500) comprising the battery (300) according to claim 16 or 17 or the battery module (400) according to claim 18.

20. A vehicle (600) comprising a battery (300) according to claim 16 or 17 or a battery pack (500) according to claim 19.

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