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

Abstract

A vehicle provided with a battery pack, the battery pack comprising a battery or a battery module, the battery comprising an explosion-proof valve, the explosion-proof valve comprising an explosion-proof valve body, a connection segment being provided at an edge of the explosion-proof valve body, a notch groove being provided in the explosion-proof valve body, an opening area being provided in the explosion-proof valve body, the opening area being disposed radially inward of the connection segment. In the depth direction of the notch groove, the shape of the orthographic projection of the explosion-proof valve body and the shape of the orthographic projection of the opening area are both non-circular, the outer edge of the orthographic projection of the opening area being a predetermined opening boundary, and the area of the orthographic projection of the opening area being S opening wherein the area of the orthographic projection of the connection segment is S connection wherein the area of the orthographic projection of the explosion-proof valve body is S total wherein S opening , S connection and S total satisfy 10% < S connection / (S total - S opening ) < 65%.

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to and the benefit of Chinese Patent Application No. 202221128927.X, filed on May 12, 2022. The entire contents of the above-referenced 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 the prior art, the explosion-proof valve of a battery is typically welded to the battery cover plate. When the gas pressure inside the battery exceeds the opening pressure of the explosion-proof valve, the explosion-proof valve opens 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, unstable welding of the explosion-proof valve of the battery increases the possibility that the entire explosion-proof valve will detach from the battery when the pressure is released, 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 prior art. Therefore, a first objective of the present disclosure is to provide an explosion-proof valve that can effectively improve the connection stability and connection strength of the connection portion. When the explosion-proof valve is applied to a battery, the safety of the battery and the entire battery system is ensured.

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

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

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

[0008] A fifth object of the present disclosure is to provide a vehicle using 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 including an explosion-proof valve body, the explosion-proof valve body having a connecting portion on an edge thereof, a carved groove provided on the explosion-proof valve body, the explosion-proof valve body having an opening region, the opening region being disposed radially inside the connecting portion, the orthogonal projection shape of the explosion-proof valve body in the depth direction of the carved groove and the orthogonal projection shape of the opening region are both non-circular, the outer edge of the orthogonal projection of the opening region is a predetermined opening boundary, and the orthogonal projection area of ​​the opening region is S open The area of ​​the orthogonal projection of the connection is S connect The area of ​​the orthogonal projection of the explosion-proof valve body is S total It is said that S open , S connect , and S total is 10% connect / (S total -S open )<65% and S open , S connect , and S total mm 2 It is measured in

[0010] According to the explosion-proof valve of the embodiment of the present disclosure, S open , S connect , and S total 10% connect / (S total -S open ​​By setting the ratio (R) < 65%, accurate design of the parameters of the explosion-proof valve can effectively improve the connection stability and connection strength of the connection of the explosion-proof valve. When the explosion-proof valve is applied to a battery, a stable connection between the explosion-proof valve and the battery can be effectively ensured, so that the opening area can be smoothly opened when the battery pressure is released, thereby effectively avoiding the problem in the prior art that the weak connection strength of the explosion-proof valve causes the explosion-proof valve to be completely blown open, affecting the safety of the battery. In other words, the use of the explosion-proof valve according to the embodiments of the present disclosure can effectively ensure the safety of the battery and the entire battery system.

[0011] In some examples, the shape of the orthogonal projection of the opening area in the depth direction of the engraved groove is elliptical, the engraved groove includes two first straight line segments arranged parallel to each other and two first arc segments arranged opposite each other, the two ends of each of the first straight line segments are respectively connected to the two first arc segments, the two first straight line segments and the two first arc segments form a closed ring structure, and the outer edge of the orthogonal projection of the engraved groove in the depth direction of the engraved groove forms a predetermined opening boundary.

[0012] In some examples, the length of each of the first straight line segments is a, and the distance between the outsides of two first straight line segments is b, where S open , a, and b are, respectively, open =a×b+πb 2 / 4, 10 mm ≤ a ≤ 50 mm, and 3 mm ≤ b ≤ 30 mm.

[0013] In some examples, the engraved groove includes two first engraved segments arranged opposite each other and having an arc shape, a second engraved segment having a straight line shape, and two third engraved segments arranged at a distance from each other and also having a straight line shape, the second engraved segments are arranged parallel to the third engraved segments, two ends of the second engraved segments are respectively connected to the two first engraved segments, and each of the third engraved segments is connected to a corresponding first engraved segment, and in the depth direction of the engraved groove, two free ends of the outer edge of the orthogonal projection of the engraved groove are connected to form a connecting line, and the connecting line and the outer edge of the orthogonal projection of the engraved groove together constitute a predetermined opening boundary.

[0014] In some examples, the engraved groove includes a fourth engraved segment having a linear shape and four fifth engraved segments having a linear shape, each of the two ends of the fourth engraved segment being connected to two fifth engraved segments arranged at a predetermined angle α, a fourth arc segment being defined between the free ends of the orthogonal projections of the two fifth engraved segments at the same end of the fourth engraved segment in the depth direction of the engraved groove, the fourth arc segment being centered at the apex of the predetermined angle, and a fourth straight line segment being defined between the free ends of the orthogonal projections of the two fifth engraved segments at the same side of the fourth engraved segment, and the two fourth arc segments and the two fourth straight line segments together constitute a predetermined opening boundary.

[0015] In some examples, in the depth direction of the engraved groove, the outer peripheral edge of the orthogonal projection of the connecting portion includes two second straight line segments arranged parallel to each other and two second arc segments arranged opposite each other, the two ends of each of the second straight line segments are respectively connected to the two second arc segments, the two second straight line segments and the two second arc segments form a closed annular structure, and in the depth direction of the engraved groove, the outer peripheral edge of the orthogonal projection of the connecting portion is the outer peripheral edge of the explosion-proof valve body.

[0016] In some examples, the length of each of the second line segments is A, and the distance between two second line segments is B, where S total , A, and B are, respectively, S total =A×B+πB 2 / 4, 10mm≦A≦70mm, and 10mm≦B≦60mm.

[0017] In some examples, the connecting portion has an elongated ring shape extending in the circumferential direction of the explosion-proof valve body, and the inner peripheral edge of the connecting portion in the orthogonal projection in the depth direction of the groove includes two third straight line segments arranged parallel to each other and two third arc segments arranged opposite each other, and the two ends of each third straight line segment are respectively connected to the two third arc segments, and the distance between the two third straight line segments is B1, where S connect and B1 are S connect =S total -πB1 2 / 4-B1×A and 9mm≦B1≦59mm.

[0018] In some examples, the explosion-proof valve body is oval or racetrack shaped.

[0019] In some embodiments, 80 mm 2 ≦S open ≦1600mm 2 , and 178.5mm 2 ≦S total ≦5212.5mm 2 is.

[0020] 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 of the present disclosure.

[0021] In some examples, the energy density of the battery is E, where E satisfies 170 wh / kg≦E≦190 wh / kg.

[0022] An embodiment of the third aspect of the present disclosure provides a battery module including a battery according to an embodiment of the second aspect of the present disclosure.

[0023] 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 of the present disclosure.

[0024] An embodiment of the fifth aspect of the present disclosure provides a vehicle including a battery according to an embodiment of the second aspect of the present disclosure or a battery pack according to an embodiment of the fourth aspect of the present disclosure.

[0025] Additional aspects and advantages of the present disclosure will be set forth in part in the description which follows, and in part will be obvious therefrom, or may be learned by practice of the present disclosure.

[0026] The above and / or other further 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]

[0027] [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 diagram of a vehicle according to one embodiment of the present disclosure. [Figure 5] FIG. 2 is a schematic diagram of a vehicle according to another embodiment of the present disclosure. [Figure 6] FIG. 10 is a schematic diagram of a vehicle according to yet another embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0028] Embodiments of the present disclosure are 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 is described below with reference to FIGS. 1 to 3. The following description of the present disclosure is given with reference to an example in which the explosion-proof valve 200 is mounted on a battery 300. When the internal pressure of the battery 300 increases, the explosion-proof valve 200 is configured to release the pressure within the battery 300.

[0029] As shown in FIG. 1, one embodiment of the first aspect of the present disclosure provides an explosion-proof valve 200 including an explosion-proof valve body 100 .

[0030] Specifically, a groove 21 is provided on the explosion-proof valve body 100. The orthogonal projection shape of the explosion-proof valve body 100 in the depth direction of the groove 21 (i.e., the direction from the top of the groove 21 to the bottom of the groove) is non-circular. With such a configuration, the non-circular explosion-proof valve body 100 can better fit the housing of the battery 300 or the cover plate of the battery 300, which can have various shapes. The explosion-proof valve body 100 has a connection portion 10 on its edge. When the explosion-proof valve 200 is installed on the battery 300, the explosion-proof valve 200 may be fixedly connected to the housing of the battery 300 or the cover plate of the battery 300 through the connection portion 10. When the explosion-proof valve body 100 is fixed to the housing of the battery 300 by welding, a weld seam is formed between the explosion-proof valve body 100 and the housing. Alternatively, if the explosion-proof valve body 100 is fixed to the cover plate of the battery 300 by welding, a weld seam is formed between the explosion-proof valve body 100 and the cover plate. The outer peripheral edge of the explosion-proof valve body 100 is located at half the width of the weld seam. The width of the weld seam is the distance between the outer and inner contours of the orthogonal projection of the weld seam in the depth direction of the groove 21. In the depth direction of the groove 21, the overlapping portion of the orthogonal projection of the weld seam and the orthogonal projection of the explosion-proof valve body 100 is the orthogonal projection of the connection portion. In other words, the outer peripheral edge of the connection portion 10 coincides with the outer peripheral edge of the explosion-proof valve body 100, and the inner peripheral edge of the connection portion 10 coincides with the inner peripheral edge of the weld seam. The "inner peripheral edge of the weld seam" refers to the edge of the weld seam on one side closer to the center of the explosion-proof valve 200.

[0031] The explosion-proof valve main body 100 has an opening region 20. The orthographic shape of the opening region 20 in the depth direction of the engraved groove 21 is non-circular. For example, the orthographic shape of the opening region 20 may be the same as the orthographic shape of the explosion-proof valve main body 100. The outer edge of the orthographic projection of the opening region 20 is a predetermined opening boundary 201. The engraved groove 21 on the explosion-proof valve main body 100 may extend along the predetermined opening boundary 201. The opening region 20 is disposed radially inward of the connection portion 10. When the internal pressure of the battery 300 increases, the pressure is smoothly released through the explosion-proof valve 200, thereby protecting the battery 300. In the depth direction of the engraved groove 21, the area of ​​the orthographic projection of the opening region 20 is S open The area of ​​the orthogonal projection of the connecting portion 10 is S connect The area of ​​the orthogonal projection of the explosion-proof valve body 100 is S total It is said that. open , S connect , and S total is 10% connect / (S total -S open )<65% and S open , S connect , and S total mm 2 It is measured in

[0032] For example, S connect / (S total -S open )≦10%, and S total remains unchanged, S connect and S open At least one of the smallest size is relatively small, which may lead to a decrease in the stability of the connection between the explosion-proof valve 200 and the battery 300, and does not contribute to the smooth opening of the opening area 20. connect / (S total -S open ) ≥ 65% and S total remains unchanged, S connect and S open ​At least one of these is relatively large, which may lead to excessively high strength of the connection part 10 and waste of material, or may increase the area of ​​the opening region 20, which may affect the opening performance of the opening region 20. Therefore, by setting the ratio of the orthogonal projection area of ​​the connection part 10 to the orthogonal projection area of ​​the explosion-proof valve 200 excluding the opening region 20 to be 10% to 65%, it is possible to ensure both the connection strength of the connection part 10 and the opening performance of the opening region 20, and it is possible to more accurately determine the degree of stability of the explosion-proof valve 200.

[0033] S connect / (S total -S open It can be seen that the larger the value of S ), the stronger the connection strength between the connection part 10 and the battery 300, and the more stable the explosion-proof valve 200. For example, connect / (S total -S open ) is the value of S connect Increase or S open Increase or S connect and S open It may be increased by increasing both

[0034] According to the explosion-proof valve 200 of the embodiment of the present disclosure, S open , S connect , and S total 10% connect / (S total -S open ​By setting the ratio (R) < 65%, accurate design of the parameters of the explosion-proof valve 200 can effectively improve the connection stability and connection strength of the connection portion 10 of the explosion-proof valve 200. When the explosion-proof valve 200 is applied to the battery 300, a stable connection between the explosion-proof valve 200 and the battery 300 can be effectively ensured, allowing the opening area 20 to smoothly open when the pressure of the battery 300 is released. This effectively avoids the problem in the prior art where the explosion-proof valve 200 is completely blown open due to weak connection strength of the explosion-proof valve 200, thereby avoiding any impact on the safety of the battery 300. In other words, the use of the explosion-proof valve 200 according to the embodiment of the present disclosure can effectively ensure the safety of the battery 300 and the entire battery system.

[0035] In some embodiments, 80 mm 2 ≦S open ≦1600mm 2 , and 178.5mm 2 ≦S total ≦5212.5mm 2 Such a configuration can not only ensure that the explosion-proof valve 200 has sufficient pressure release capacity, but also ensure the stability of the connection between the explosion-proof valve 200 and the housing of the battery 300 or the cover plate of the battery 300.

[0036] According to some embodiments of the present disclosure, referring to FIG. 1 , the orthogonal projection of the opening area 20 in the depth direction of the groove 21 may be elliptical. Such a configuration can better fit the explosion-proof valve 200 and can also fit the shape of the housing or cover plate (not shown) of the battery 300 using the explosion-proof valve 200. Furthermore, compared to the circular explosion-proof valve 200, the elliptical opening area 20 can discharge a larger amount of gas per unit time, thereby achieving a better pressure release effect. The groove 21 includes two first straight line segments 211 arranged parallel to each other and two first arc segments 212 arranged opposite each other. The two ends of each of the two first straight line segments 211 are connected to the two first arc segments 212, respectively, so that the groove 21 forms a closed ring structure. The outer edge of the orthogonal projection of the groove 21 in the depth direction of the groove 21 constitutes the predetermined opening boundary 201. That is, the area of ​​the region defined by the outer edges of the two first straight line segments 211 and the two first arc segments 212 is the area of ​​the orthogonal projection of the opening region 20 .

[0037] The length of each of the first straight line segments 211 is a, and the distance between the outsides of two first straight line segments 211 is b, where S open , a, and b are, respectively, open =a×b+πb 2 4, 10 mm≦a≦50 mm, and 3 mm≦b≦30 mm. For example, a=30 mm and b=10 mm. However, the present disclosure is not limited thereto. Therefore, by determining the dimensions a and b, the opening area 20 can be opened smoothly and pressure can be released in a timely manner, improving the safety of the battery 300 using the explosion-proof valve 200. It can be seen that the outside of the first straight line segment 211 is the side of the first straight line segment 211 that is away from the center of the explosion-proof valve 200.

[0038] The cross section of the groove 21 may be rectangular or inverted trapezoidal. Here, the term "cross section" refers to a plane parallel to the depth direction of the groove 21. When the cross section of the groove 21 is an inverted trapezoid, the width of the groove 21 gradually decreases toward the groove bottom. In this case, "a" may be understood as the length of the outer edge of the first straight line segment 211 at the groove top or opening, and "b" may be understood as the diameter of the outer edge of the first arc segment 212 at the groove top or opening. In other words, in the depth direction of the groove 21 (i.e., in the direction from the groove top to the groove bottom of the groove 21), the outer edge of the groove 21 when orthogonally projected includes two semicircles located opposite each other, "b" may be understood as the diameter of the semicircles, and "a" may be understood as the distance between the centers of the two semicircles.

[0039] In some embodiments, as shown in FIG. 2 , the groove 21 is a C-shaped groove. The groove 21 includes two arc-shaped first segments 213 arranged opposite each other, a linear second segment 214, and two linear third segments 215 arranged at a distance from each other. The second segments 214 are arranged parallel to the third segments 215. Two ends of the second segments 214 are connected to the two first segments 213, respectively. Each of the third segments 215 is connected to a corresponding one of the first segments 213. In other words, the second engraved segment 214 is connected to one end of each of the two first engraved segments 213, and the other end of each of the two first engraved segments 213 is respectively connected to one third engraved segment 215, and the two third engraved segments 215 are spaced apart from each other. In the depth direction of the engraved groove 21, two free ends of the outer edge of the orthogonal projection of the engraved groove 21 are connected to form a connecting line 216, and the outer edge of the orthogonal projection of the engraved groove 21 and the connecting line 216 together constitute the predetermined opening boundary 201. In this case, the area of ​​the region defined within the predetermined opening boundary 201 (i.e., the area of ​​the orthogonal projection of the opening region 20 in the depth direction of the engraved groove 21) is S c It is said that S c =a1×b1+π×b12 The total length of the groove 21 is L c It is said that L c = 2a1 - c1 + πb1, where a1 represents the length of second engraved segment 214, b1 represents the distance between the outside of second engraved segment 214 and the outside of third engraved segment 215, and c1 represents the distance between two third engraved segments 215. c1 is the length of connecting line 216.

[0040] The cross section of the groove 21 may be rectangular or inverted trapezoidal. Here, the term "cross section" refers to a plane parallel to the depth direction of the groove 21. When the cross section of the groove 21 is an inverted trapezoid, the width of the groove 21 gradually decreases toward the groove bottom. In this case, a1 may be understood as the length of the outer edge of the second groove segment 214 at the groove top or opening, and b1 may be understood as the diameter of the outer edge of the first groove segment 213 at the groove top or opening. In other words, in the depth direction of the groove 21 (i.e., in the direction from the groove top to the groove bottom of the groove 21), the outer edge of the groove 21 when orthogonally projected includes two semicircles on opposite sides, and b1 may be understood as the diameter of the semicircles, and a1 may be understood as the distance between the centers of the two semicircles.

[0041] In some other embodiments, as shown in FIG. 3 , the groove 21 is a double-ended Y-shaped groove. The groove 21 includes a fourth groove segment 217 that is linear and four fifth groove segments 218 that are linear. Each of the two ends of the fourth groove segment 217 is connected to two fifth groove segments 218 that are disposed at a predetermined angle. The predetermined angle is α. In the depth direction of the groove 21, a fourth arc segment 219 is defined between the free ends of the orthogonal projections of the two fifth groove segments 218 that are located at the same end of the fourth groove segment 217. The fourth arc segment 219 is centered at the vertex of the predetermined angle (i.e., α). A fourth straight line segment 220 is defined between the free ends of the orthogonal projections of two fifth engraved segments 218 on the same side of the fourth engraved segment 217 in the depth direction of the engraved groove 21. The two fourth arc segments 219 and the two fourth straight line segments 220 together form the predetermined opening boundary 201.

[0042] Note that the widths of fourth engraved segment 217 and fifth engraved segment 218 are relatively small and may be ignored, so fourth arc segment 219 and fourth straight segment 220 intersect at approximately one point. Fourth arc segment 219 may be understood as being defined by the opposite free ends E of the two fifth engraved segments 218, which are disposed on the same end of fourth engraved segment 217, in an orthographic projection. Fourth straight segment 220 may be understood as being defined by the opposite free ends F of the two fifth engraved segments 218, which are disposed on the same side of fourth engraved segment 217, in an orthographic projection. 3, the "fourth arc segment 219" refers to the arc between the free ends E of the two fifth engraved segments 218 disposed at the left end of the fourth engraved segment 217, and the arc between the free ends E of the two fifth engraved segments 218 disposed at the right end of the fourth engraved segment 217. The "fourth straight line segment 220" refers to the straight line between the free ends F of the two fifth engraved segments 218 disposed above the fourth engraved segment 217, and the straight line between the free ends F of the two fifth engraved segments 218 disposed below the fourth engraved segment 217.

[0043] Specifically, the free ends E of the two fifth engraved segments 218 disposed at the same end of the fourth engraved segment 217 refer to the opposite free end points of the two fifth engraved segments 218 disposed at the same end of the fourth engraved segment 217. The free ends F of the two fifth engraved segments 218 disposed on the same side of the fourth engraved segment 217 refer to the opposite free end points of the two fifth engraved segments 218 disposed on the same side of the fourth engraved segment 217. As shown in FIG. 3 , from left to right, the two fifth engraved segments 218 at the left end of the fourth engraved segment 217 approach each other and connect to the fourth engraved segment 217, while the two fifth engraved segments 218 at the right end of the fourth engraved segment 217 extend away from each other. In this case, the area of ​​the region defined within the predetermined opening boundary 201 (i.e., the area of ​​the orthogonal projection of the opening region 20 in the depth direction of the groove 21) is S double-y It is said that,

number

[0044] Therefore, different shapes of the grooves 21 can change the structural strength of the opening area 20. An appropriate groove 21 can be selected according to various design standards, thereby reducing the manufacturing process difficulty of the explosion-proof valve 200, increasing the pressure release speed of the explosion-proof valve 200, and improving the safety performance of the battery 300. For example, when the internal pressure of the battery 300 increases, the internal pressure of the battery 300 pushes the opening area 20 outward, increasing the likelihood of deformation of the opening area 20. A C-shaped groove or a double-ended Y-shaped groove can increase the deformation of the opening area 20 to a certain extent, relatively improving the structural strength of the opening area 20, thereby effectively preventing unintentional opening of the explosion-proof valve 20.

[0045] Furthermore, the cross section of the groove 21 may be rectangular or inverted trapezoidal. Here, the term "cross section" refers to a plane parallel to the depth direction of the groove 21. When the cross section of the groove 21 is an inverted trapezoid, the width of the groove 21 gradually decreases toward the groove bottom. In this case, a2 may be understood as the length of the outer edge of the fourth groove segment 217 at the groove top or opening, b2 may be understood as the distance between the free ends of two fifth groove segments 218 disposed on the same side of the fourth groove segment 217 at the groove top or opening, and c2 may be understood as the length of the outer edge of the fifth groove segment 218 at the groove top or opening.

[0046] In some embodiments, as shown in FIG. 1 , the outer periphery of the connecting portion 10 in the depth direction of the groove 21 includes two second straight line segments 11 arranged parallel to each other and two second arc segments 12 arranged opposite each other. Two ends of each second straight line segment 11 are connected to the two second arc segments 12, respectively. The two second straight line segments 11 and the two second arc segments 12 form a closed annular structure. In the depth direction of the groove 21, the outer periphery of the connecting portion 10 in the orthogonal projection is the outer periphery of the explosion-proof valve body 100 in the orthogonal projection. The length of each second straight line segment 11 is A, and the distance between the two second straight line segments 11 is B. The two second straight line segments 11 and the two second arc segments 12 together define a closed area. The area of ​​the closed area (i.e., the area S of the orthogonal projection of the explosion-proof valve body 100) total ) may include two semicircles with radius ½B and a rectangle with length A and width B.

[0047] S total , A, and B are, respectively, S total =A×B+πB 2Therefore, by determining the dimensions A and B of the explosion-proof valve body 100 to be within the above ranges, the area S of the orthogonal projection of the explosion-proof valve body 100 in the depth direction of the groove 21 is total The values ​​of A and B are controlled within a reasonable range to accommodate batteries 300 of various sizes and facilitate the manufacture of the explosion-proof valve body 100. For example, A=50 mm and B=30 mm. However, the present disclosure is not limited thereto.

[0048] 1, the connecting portion 10 has an elongated ring shape extending in the circumferential direction of the explosion-proof valve body 100, and the outer peripheral edge of the connecting portion 10 is the outer peripheral edge of the explosion-proof valve body 100. The inner peripheral edge of the connecting portion 10 as orthogonally projected in the depth direction of the groove 21 includes two third straight line segments 13 arranged parallel to each other and two third arc segments 14 arranged opposite each other. The two ends of each third straight line segment 13 are connected to the two third arc segments 14, respectively. The distance between the two third straight line segments 13 is defined as B1. S connect and B1 are S connect =S total -πB1 2 / 4-B1×A and 9 mm≦B1≦59 mm. In other words, the area S of the connecting portion 10 connect may be the difference between the area defined by the boundary enclosed by the two second straight line segments 11 and the two second circular arc segments 12 and the area defined by the boundary enclosed by the two third straight line segments 13 and the two third circular arc segments 14.

[0049] If B1<10 mm, the area S of the connection part 10 connect increases, and the area S of the opening region 20 open If B1>60 mm, the area S of the connection part 10 may not be secured, which may affect the normal pressure release of the explosion-proof valve 200. connectThis may reduce the connection stability of the connection part 10. If the internal pressure of the battery 300 is too high, there is a high possibility that the entire explosion-proof valve 200 will be blown open, which will affect the safety of the battery 300 and the entire battery system. connect =S total -πB1 2 By setting B1 to be / 4-B1×A and determining the value range of B1, the area of ​​the connection part 10 can be within an appropriate range, thereby increasing the connection strength of the connection part 10 while ensuring normal pressure release of the explosion-proof valve 200.

[0050] Optionally, the anti-explosion valve body 100 may be configured to have an oval or racetrack shape, so that the anti-explosion valve 200 can better adapt to the shape of the housing of the battery 300 or the shape of the cover plate of the battery 300, increase the amount of gas discharged per unit time, and improve the pressure release performance of the anti-explosion valve 200.

[0051] 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, as shown in FIG.

[0052] 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. A mounting hole (not shown) is formed in the housing or the cover plate, and the explosion-proof valve 200 is connected to the mounting hole. The connection portion 10 of the explosion-proof valve 200 may be connected to the housing or the cover plate by welding.

[0053] According to the battery 300 of the embodiment of the present disclosure, the use of the explosion-proof valve 200 makes it possible to achieve both a secure connection between the explosion-proof valve 200 and the battery 300 and good pressure release capability, thereby improving the safety of use of the battery 300.

[0054] In some embodiments, the energy density of the battery 300 is E, where E satisfies 170 wh / kg≦E≦190 wh / kg. For example, E=180 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 greater the amount of active material required in the battery 300 or the higher the activity of the material. Such a battery 300 requires a more precise design of the amount of gas discharged through the explosion-proof valve 200 to ensure timely release of the explosion-proof valve 200 in extreme cases and avoid unintended start-up. The explosion-proof valve 200 of the above embodiment of the present disclosure can fully meet this requirement.

[0055] An embodiment of the third aspect of the present disclosure provides a battery module 400 including the batteries 300 according to the embodiment of the second aspect, as shown in FIG. 4 . For example, the battery module 400 may include a plurality of batteries 300 arranged side by side. The battery module 400 may further include two end plates (not shown) and two side plates (not shown). The two end plates are arranged at two ends of each of the plurality of batteries 300 in a first direction. The two side plates are arranged at two sides of each of the plurality of batteries 300 in a second direction. The end plates and 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 arranged at two ends of each of the plurality of batteries 300 and fixed by the cable ties.

[0056] The use of the battery 300 in the battery module 400 of the embodiment of the present disclosure improves the safety of the battery module 400 in use.

[0057] An embodiment of the fourth aspect of the present disclosure provides a battery pack 500 including a battery 300 according to an embodiment of the second aspect or a battery module 400 according to an embodiment of the third aspect, as shown in Figures 4 and 5.

[0058] The use of the battery 300 or the battery module 400 in the battery pack 500 of the embodiment of the present disclosure can improve the safety of use of the battery pack 500. For example, the battery pack 500 may include a tray (not shown), 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.

[0059] An embodiment of the fifth aspect of the present disclosure provides a vehicle 600 including 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 Figures 4 to 6. For example, in some embodiments, the battery 300 may be mounted directly on the vehicle 600. In some other embodiments, the battery 300 is assembled into a battery pack 500, and the battery pack 500 is mounted on the vehicle 600.

[0060] By using the battery pack 500 in the vehicle 600 according to the embodiment of the fifth aspect of the present disclosure, the safety of use of the vehicle 600 can be improved.

[0061] Optionally, the explosion-proof valve 200 may be positioned facing downward to prevent the discharged hot gases from injuring occupants within the vehicle 600 .

[0062] In describing the present disclosure, it should be understood that orientations or positional relationships indicated by terms such as "center," "length," "width," "thickness," "above," "below," "horizontal," "top," "bottom," "inside," and "outside" are based on the orientations or positional relationships shown in the accompanying drawings, and do not represent or imply that the devices or components referred to need have a particular orientation or be constructed and operated in a particular orientation, but are merely used for ease and simplicity of illustration and description. Thus, such terms should not be construed as limiting the present disclosure.

[0063] In the description of this disclosure, a "first feature" and a "second feature" can include one or more features. In the description of this disclosure, "multiple" and "a plurality of" mean two or more. In the description of this disclosure, a first feature "over" or "under" a second feature can mean that the first feature and the second feature are in direct contact with each other, or that the first feature and the second feature are not in direct contact with each other but are in contact through another intervening feature. In the description of this disclosure, the terms "over," "above," and "on" a first feature of a second feature can include the first feature being directly above or diagonally above the second feature, or simply mean that the horizontal height of the first feature is higher than the horizontal height of the second feature.

[0064] In the description herein, references to terms such as "one embodiment," "some embodiments," "exemplary embodiments," "example," "specific example," 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.

[0065] While embodiments of the present disclosure have been illustrated 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, and the scope of the present disclosure is intended to be defined by the appended claims and their equivalents. [Explanation of symbols]

[0066] 100 Explosion-proof valve body 10 Connection 11 Second straight line segment 12 Second Arc Segment 13 Third Line Segment 14 Third Arc Segment 20 aperture area 201 Predetermined opening boundary 21 Engraved groove 211 First Line Segment 212 First Arc Segment 213 First engraved segment 214 Second engraved segment 215 Third engraved segment 216 connecting line 217 Fourth engraved segment 218 5th engraved segment 219 Fourth Arc Segment 220 Fourth Line Segment 200 Explosion-proof valve 300 batteries 400 battery module 500 battery packs 600 vehicles

Claims

1. The explosion-proof valve body (100) has a connecting portion (10) on its edge, and a groove (21) is provided on the explosion-proof valve body (100). The explosion-proof valve body (100) has an opening region (20), and the opening region (20) is disposed radially inside the connecting portion (10). The orthogonal projection shape of the explosion-proof valve body (100) in the depth direction of the groove (21) and the orthogonal projection shape of the opening region (20) are both non-circular, and the outer edge of the orthogonal projection of the opening region (20) is a predetermined opening boundary (201); The area of ​​the orthogonal projection of the opening area (20) is S ｏｐｅｎ The area of ​​the orthogonal projection of the connection part (10) is S ｃｏｎｎｅｃｔ The area of ​​the orthogonal projection of the explosion-proof valve body (100) is S ｔｏｔａｌ It is said that S ｏｐｅｎ , S ｃｏｎｎｅｃｔ , and S ｔｏｔａｌ is 10% < S ｃｏｎｎｅｃｔ / (S ｔｏｔａｌ -S ｏｐｅｎ ) < 65%, and S ｏｐｅｎ , S ｃｏｎｎｅｃｔ , and S ｔｏｔａｌ is mm ２ It is measured in Explosion-proof valve (200).

2. The shape of the orthogonal projection of the opening region (20) in the depth direction of the groove (21) is elliptical; The groove (21) comprises two first straight line segments (211) arranged parallel to each other and two first arc segments (212) arranged opposite each other, and two ends of each of the first straight line segments (211) are connected to the two first arc segments (212), respectively, and the two first straight line segments (211) and the two first arc segments (212) form a closed annular structure; 2. The explosion-proof valve (200) according to claim 1, wherein an outer edge of the orthogonal projection of the groove (21) in the depth direction of the groove (21) constitutes the predetermined opening boundary (201).

3. The length of each of the first straight line segments (211) is a, and the distance between the outsides of two of the first straight line segments (211) is b, where S ｏｐｅｎ , a, and b are respectively S ｏｐｅｎ = a × b + π b ２ 3. The explosion-proof valve (200) of claim 2, wherein the following conditions are satisfied: / 4, 10 mm≦a≦50 mm, and 3 mm≦b≦30 mm.

4. The groove (21) comprises two arc-shaped first segments (213) arranged opposite each other, a linear second segment (214), and two linear third segments (215) arranged at a distance from each other, the second segments (214) being arranged parallel to the third segments (215), two ends of the second segments (214) being connected to the two first segments (213), and each of the third segments (215) being connected to a corresponding one of the first segments (213); 2. The explosion-proof valve (200) according to claim 1, wherein, in the depth direction of the engraved groove (21), two free ends of the outer edge portion of the orthogonal projection of the engraved groove (21) are connected to form a connecting line (216), and the connecting line (216) and the outer edge portion of the orthogonal projection of the engraved groove (21) together constitute the predetermined opening boundary (201).

5. The groove (21) comprises a fourth segment (217) having a linear shape and four fifth segments (218) having a linear shape, and two ends of the fourth segment (217) are connected to two fifth segments (218) arranged at a predetermined angle α, 2. The explosion-proof valve according to claim 1, wherein, in the depth direction of the groove, a fourth arc segment is defined between free ends of orthogonal projections of two fifth engraved segments that are at the same end of the fourth engraved segment, the fourth arc segment is centered at the vertex of the preset angle, and a fourth straight line segment is defined between free ends of orthogonal projections of two fifth engraved segments that are at the same side of the fourth engraved segment, the two fourth arc segments and the two fourth straight line segments together constituting the predetermined opening boundary.

6. In the depth direction of the groove (21), the outer peripheral edge of the orthogonal projection of the connecting portion (10) comprises two second straight line segments (11) arranged parallel to each other and two second arc segments (12) arranged opposite each other, and two ends of each of the second straight line segments (11) are connected to the two second arc segments (12), respectively, and the two second straight line segments (11) and the two second arc segments (12) form a closed annular structure; The explosion-proof valve (200) according to claim 1, wherein in the depth direction of the engraved groove (21), the outer peripheral edge portion of the orthogonal projection of the connection portion (10) is the outer peripheral edge portion of the orthogonal projection of the explosion-proof valve main body (100).

7. The length of each of the second straight line segments (11) is A, and the distance between two of the second straight line segments (11) is B, where S ｔｏｔａｌ , A, and B are, respectively, ｔｏｔａｌ = A × B + πB ２ 7. The explosion-proof valve (200) of claim 6, wherein the following conditions are satisfied: 1 / 4, 10 mm≦A≦70 mm, and 10 mm≦B≦60 mm.

8. The connecting portion (10) has an elongated ring shape extending in the circumferential direction of the explosion-proof valve body (100), and the inner peripheral edge of the orthogonal projection of the connecting portion (10) in the depth direction of the engraved groove (21) has two third straight line segments (13) arranged parallel to each other and two third arc segments (14) arranged opposite each other, and two ends of each of the third straight line segments (13) are connected to the two third arc segments (14), respectively, and the distance between the two third straight line segments (13) is B. １ Here, S ｃｏｎｎｅｃｔ and B １ are respectively, S ｃｏｎｎｅｃｔ = S ｔｏｔａｌ -πB １ ２ / 4-B １ × A, and 9 mm ≦ B １ The explosion-proof valve (200) of claim 7, wherein the thickness satisfies ≦59 mm.

9. The explosion-proof valve (200) of claim 1, wherein the explosion-proof valve body (100) is oval or racetrack shaped.

10. 80mm ２ ≦S ｏｐｅｎ ≦1600mm ２ , and 178.5 mm ２ ≦S ｔｏｔａｌ ≦5212.5mm ２ The explosion-proof valve (200) of claim 1,

11. A battery (300) comprising an anti-explosion valve (200) according to any one of claims 1 to 10.

12. 12. The battery (300) of claim 11, wherein the energy density of the battery (300) is E, where E satisfies 170 wh / kg≦E≦190 wh / kg.

13. A battery module (400) comprising the battery (300) of claim 11.

14. A battery pack (500) comprising a battery module (400) as described in claim 13.

15. A vehicle (600) equipped with a battery pack (500) as described in claim 14.

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