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 explosion-proof valves, batteries, battery modules, battery packs, and vehicles. [Background technology]

[0003] In related art, the explosion-proof valve of a battery is typically welded to the cover plate of the battery. If the gas pressure inside 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 a battery explosion. However, if the pressure inside the battery changes and becomes excessively high, if the welding of the explosion-proof valve to the battery is unstable, there is a high possibility that the entire explosion-proof valve will be blown open during pressure release, 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, a first objective of the present disclosure is to provide an explosion-proof valve, which improves the stability of the explosion-proof valve after being installed in a battery, increases the speed of pressure relief, and improves 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 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 having an opening region; an explosion-proof scored groove 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 are connected to the two arc segments, respectively; at least one end of the second straight segment is connected to the arc segment; and the first straight segment is arranged parallel to the second straight segment; an orthographic projection of the opening region has an oblong shape in a depth direction of the explosion-proof scored groove; 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 length range of the first straight 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 released from the explosion-proof valve per unit time, thereby rapidly releasing the internal pressure of the battery. 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, resulting in a more stable installation of the explosion-proof valve, 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 second straight line segments is two, each of which is connected to a corresponding arc segment, and in the depth direction of the explosion-proof groove, 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 examples, c1 further satisfies c1≦10 mm.

[0017] In some examples, the number of second straight line segments is one, and 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 region, the structural scored groove being connected to the explosion-proof scored groove.

[0019] In some examples, in the depth direction of the explosion-proof groove, 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 that are 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, the length of the first groove is defined as d, the length of each of the second grooves is defined as c2, and the 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 the 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, and the explosion-proof groove is formed on a bottom wall of the recess, and a side wall of the explosion-proof groove away from the center of the explosion-proof valve body is flush with a side wall 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 200 wh / kg≦E≦280 wh / 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 including 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 that 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 description of the embodiments taken in conjunction with the accompanying drawings. [Brief explanation of the drawings]

[0032] [Figure 1] 1 is a schematic diagram of an explosion-proof valve according to one embodiment of the present disclosure. [Figure 2] FIG. 10 is a schematic diagram of an explosion-proof valve according to another embodiment of the present disclosure. [Figure 3] FIG. 10 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. [Figure 5] FIG. 1 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. 10 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. 10 is a schematic diagram of a vehicle according to yet another embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0033] 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 pressure in the battery 300 when the internal pressure of the battery 300 increases.

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

[0035] Specifically, referring to FIGS. 1 to 3 , the explosion-proof valve body 100 has an opening region 10. When the explosion-proof valve 200 is applied to a battery 300 and pressure inside the battery 300 increases, gas inside the battery 300 can be smoothly released 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 of the opening region 10 has a horizontally elongated shape. 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 a prismatic battery 300. The horizontally elongated opening region 10 can better fit the shape of the housing of the battery 300, thereby increasing the orthogonal projection area S of the opening region 10 and thus the amount of gas released. 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 remaining portions 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 remaining portions 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 increases 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, which effectively prevents the opening region 10 from being unable to open normally or the entire explosion-proof valve 200 from being forced 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 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 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. The area of ​​the orthogonal projection of the opening area 10 in the depth direction of the explosion-proof groove 11 is defined as S. S, a, and b are expressed as S=a×b+π×b 2 / 4, S≧80mm 2 , and b≧6mm are satisfied.

[0038] The outside of the first straight line segment 111 can be understood to be 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 can be understood to be 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 trapezoidal. In this specification, the term "cross-section" refers to 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 to be the length of the outer edge of the first straight line segment 111 at the top, i.e., the opening, of the groove, and "b" can be understood to be the diameter of the outer edge of the arc segment 113 at the top, i.e., the 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, where 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, where the two semicircles are respectively connected to both ends of the rectangle in the length direction.

[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 regarding the pressure relief capability of the explosion-proof valve 200, thereby realizing smooth pressure relief. S<80mm 2If this is the case, 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, which may result in the increased pressure inside the battery 300 forcing the explosion-proof valve 200 open and affecting other battery systems, thereby reducing the safety of 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 orthogonal projection area S 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 a 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 released from the explosion-proof valve 200 per unit time, thereby rapidly releasing the internal pressure of the battery 300. In addition, by defining the ranges of the values ​​of S and b, the area S of the opening area 10 may not only satisfy the requirements for smooth pressure release, but also improve the structural strength of the explosion-proof valve 200, thereby improving the reliability and service life of the explosion-proof valve 200 attached to 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 would result in a decrease in the structural stability of the explosion-proof valve 200 and make the opening area 10 more susceptible to unintentional opening, 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 groove 11.

[0043] In some embodiments, the length of the first straight segment 111 satisfies 8 mm≦a≦30 mm. This configuration can ensure that the explosion-proof valve 200 has a sufficient opening area without excessively large openings. For a given total area of ​​the explosion-proof valve 200, this effectively prevents the opening area 10 from occupying an excessively large area of ​​the explosion-proof valve 200, which would result in a reduction in the structural stability of the explosion-proof valve 200 and make the opening area 10 more susceptible to unintentional opening, thereby affecting the service life of the explosion-proof valve 200.

[0044] 1 , the length of the first straight segment 111 is defined as a, the distance between the outside of the first straight segment 111 and the outside of the second straight segment 112 is defined as b, and a and b satisfy a>b, 8 mm≦a≦30 mm, and b<30 mm. 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 (the vertical direction in FIG. 1 ), ensuring that the opening area 10 has a horizontally elongated shape. As a result, 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 ranges of a and b, a reasonable area of ​​the opening area 10 can be formed, which enhances the structural strength of the opening area 10 and facilitates timely release of the increased pressure inside the battery 300 through the opening area 10, thereby improving the safety of the battery 300.

[0045] In some embodiments, as shown in FIGS. 1 and 2 , the explosion-proof groove 11 includes a first straight line segment 111, two arc segments 113 disposed on either side, 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 a corresponding arc segment 113. In the depth direction of the explosion-proof groove 11, two free ends of the outer edge of the orthographic 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 farther from the center of the explosion-proof valve 200 is the connecting line 114. The connecting line 114 and the outer edge of the orthographic projection of the explosion-proof groove 11 jointly constitute the 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 increased, thereby improving the opening stability of the opening area 10. As a result, the opening area 10 is less likely to fall off the explosion-proof valve 200 during pressure release, causing 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 either side. The number of second straight line segments 112 is one, and 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 and the second straight line segment 112 are connected to two arc segments 113, respectively. 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, forming a closed ring shape. In this case, the area of ​​the predetermined opening boundary 101 is defined as S2, where S2=a×b+π×b 2 / 4, where a represents the length of the first straight line segment, and b represents the distance between the outside of the first straight line segment 111 and the outside of the second straight line segment 112. Therefore, it is ensured that the explosion-proof valve 200 can be opened by the explosion-proof groove while releasing 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 trapezoidal. In this specification, "cross-section" refers to 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. In this case, "a" can be understood as the length of the outer edge of the first straight line segment 111 at the top, i.e., opening, of the groove, and "b" can be understood as the diameter of the outer edge of the arc segment 113 at the top, i.e., 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 either side, "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 to 3 (i.e., related art) and Examples 1 to 6 (i.e., embodiments of the present disclosure) are described below. The batteries in Comparative Examples 1 to 3 and the batteries 300 in Examples 1 to 6 were tested using the method specified in GB / T 31485-2015, respectively, and the pressure release 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 to 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 to 6 were selected from Table 1 below. The final test results are shown in Figures 5 to 7. Table 1 shows the values ​​of a and b and the corresponding values ​​of S in six different Examples (i.e., Examples 1 to 6) of the present disclosure, where the ranges of a and b basically gradually increase, and S also shows an overall increasing trend. Table 2 shows the values ​​of a and b and the corresponding values ​​of S in three comparative examples (i.e., comparative examples 1 to 3). 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 fluctuation 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 fluctuation 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 fluctuation 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] 2 and 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. 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 interior 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 notched grooves 12 can increase the deformation of the opening region 10 to a certain extent, relatively improving the structural strength of the opening region 10, and thereby effectively preventing unintentional opening of the explosion-proof valve 200. Therefore, by arranging the structural notched grooves 12 in the opening region 10, the structural strength of the opening region 10 can be improved, unintentional opening of the explosion-proof valve 200 can be avoided, and 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 contributes 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] Referring to FIG. 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 satisfy L2 = 2a - c1 + πb and 1 mm ≦ c1 ≦ 10 mm, respectively. 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. The other ends of the two second grooves 1222 extend away from each other in a direction away from the first groove 1221, forming an angle between the two second grooves 1222. For example, the two second grooves 1222 may be symmetrically distributed with respect to the first groove 1221. The other end of the first groove 1221 and at least one of the other ends of the two second grooves 1222 are 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 knurling length of the Y-shaped knurled groove 122 is defined as L2, where L2, c2, and d satisfy L2=d+2c2, 5 mm≦c2≦30 mm, and 5 mm≦d≦30 mm.

[0061] Therefore, by providing the first and second notched grooves 1221 and 1222 and defining the range of lengths of the first and second notched grooves 1221 and 1222, when the internal pressure of the battery 300 increases, the Y-shaped notched groove 122 deforms and the opening area 10 forms a suitable opening area S for releasing the pressure. This prevents the length of the Y-shaped notched groove 122 from being too small, which may weaken the structural strength of the Y-shaped notched groove and result in unintentional opening. Alternatively, this prevents the value of at least one of c2 and d from being too large, which may cause the opening area 10 to be forced open when the increased pressure inside the battery 300 does not reach a predetermined pressure, thereby reducing the pressure release capability 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 unintentionally opening.

[0063] According to some specific embodiments of the present disclosure, as shown in FIGS. 3 and 4 , the explosion-proof valve body 100 includes a connecting section 20, a buffer section 30, and a support section 40. The connecting section 20 is connected to the outer periphery of the support section 40. The support section 40 is spaced apart from the connecting section 20 in the thickness direction of the support section 40. The buffer section 30 is connected between the connecting section 20 and the support section 40. For example, the connecting section 20 and the support section 40 may both be horizontally disposed, and the connecting section 20 is spaced apart from the support section 40 in the thickness direction of the explosion-proof valve body 100. One end of the buffer section 30 is connected to the inner periphery of the connecting section 20, and the other end of the buffer section 30 is connected to the outer periphery of the support section 40. The thickness direction of the support section 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 in the connecting area 20 can be changed to prevent the stress from being directly transmitted to the support area 40, which would reduce the structural stability of the opening area 10. For example, the buffer area 30 may be configured to absorb 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 section 40. The recess 41 is formed with an open opening. The open opening is provided on the side facing the connection section 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. 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 within the explosion-proof groove 11 can be reduced, making it easier to open 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 an 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 as a whole is recessed toward the inside of the battery 300, thereby effectively preventing 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 area 40. The support area 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 improve 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 attaching the cover plate, and an attachment hole (not shown) is formed in the housing or cover plate, and the explosion-proof valve 200 is connected to the attachment hole. The connection area 20 of the explosion-proof valve 200 may be connected to the housing or cover plate by welding. When the explosion-proof valve body 100 is fixed to the housing or cover plate of the battery 300 by welding, the connection area 20 and a portion of the housing or cover plate jointly form a weld seam. In this case, the connection area 20 is an orthogonal projection of the weld seam in the explosion-proof valve body 100, and the edge of the explosion-proof valve body 100 may be located at a position half the width of the weld seam formed by welding the explosion-proof valve 200 to the battery 300 (e.g., the housing or 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 safety of use 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 200 wh / kg≦E≦280 wh / kg. For example, E=250 wh / kg. However, the present disclosure is not limited thereto. Therefore, 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 larger the amount of active material, or the higher the activity of the material, required within the battery 300. Such a battery 300 requires a more precise design of the amount of gas released from the explosion-proof valve 200 to ensure timely opening and avoid unintended initiation in extreme cases. The explosion-proof valve 200 of the above-described 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. Therefore, using 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 at both ends of each of the plurality of batteries 300 in the first direction. The two side plates are distributed at two side surfaces of each of the plurality of batteries 300 in the 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 cable ties (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 ties.

[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. Therefore, 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 a battery 300 according to an embodiment of the second aspect or a battery pack 500 according to an embodiment of the fourth aspect, as shown in FIGS. 8 to 10 . Therefore, 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 high-temperature gas from injuring occupants 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 to indicate or imply that the devices or components being described need have a particular orientation or be constructed and operated in a particular orientation. Accordingly, such terms should not be construed as limitations of the present disclosure.

[0080] In the description of this disclosure, a "first feature" and a "second feature" may include one or more features. In the description of this 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," "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. In this 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 principle 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 Line Segment 112 Second Line Segment 113 Arc Segments 114 connecting wire 12 Structural grooves 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) attached to a battery (300), An explosion-proof valve body (100), the explosion-proof valve body (100) having an opening area (10), an explosion-proof groove (11) provided on an edge of the opening area (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 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 b≧6 mm; The device further comprises a structural groove (12), the structural groove (12) being provided in the opening region (10) and connected to the explosion-proof groove (11); 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).

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

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

4. The explosion-proof valve (200) according to claim 1, 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 circular arc segment (113); 2. The explosion-proof valve (200) according to claim 1, 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 The length of the explosion-proof groove (11) is defined as 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 thicknesses satisfies ≧1 mm.

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

8. The number of second straight line segments (112) is one, and 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 claim 1, 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 claim 1, wherein the structural groove (12) comprises an X-shaped groove (121) or a Y-shaped groove (122).

10. 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 end of the first groove (1221) and the other ends of the two second grooves (1222) is 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 , 5 mm ≦ c ２ 10. The explosion-proof valve (200) of claim 9, wherein 5 mm≦d≦30 mm.

11. 11. The explosion-proof valve (200) of claim 10, wherein an angle between the two second grooves (1222) is defined as α, and α satisfies 30°≦α≦150°.

12. 2. The explosion-proof valve (200) according to claim 1, 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 apart 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).

13. 2. The explosion-proof valve (200) according to claim 1, 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).

14. A battery (300) comprising the explosion-proof valve (200) of claim 1.

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

16. A battery module (400) comprising the battery (300) of claim 14.

17. A battery pack (500) comprising the battery module (400) of claim 16.

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

Images