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 the priority and benefit of Chinese Patent Application No. 202221128927.X, filed on May 12, 2022. The entire content of the above - referenced application is incorporated herein by reference.

[0002] The present disclosure relates to the technical field of batteries, and more particularly, to explosion - proof valves, batteries, battery modules, battery packs, and vehicles.

Background Art

[0003] In the prior art, the explosion - proof valve of a battery is usually welded to the cover plate of the battery. When the gas pressure inside the battery exceeds the opening pressure of the explosion - proof valve, the explosion - proof valve opens to release the gas generated inside the battery, thereby preventing safety accidents such as battery explosion. However, when the pressure inside the battery changes and becomes too high, due to the unstable welding of the explosion - proof valve of the battery, there is a high possibility that the entire explosion - proof valve will fall off from the battery during pressure release, affecting the safety of the entire battery and battery system.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The present disclosure aims to solve at least one of the technical problems in the prior art. Therefore, the first objective of the present disclosure is to provide an explosion - proof valve that can effectively improve the connection stability and connection strength of its connection part. When the explosion - proof valve is applied to a battery, the safety of the entire battery and battery system is ensured.

[0005] The second objective of the present disclosure is to provide a battery using the explosion - proof valve.

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

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

[0008] A fifth object of the present disclosure is to provide a vehicle using a battery pack.

Means for Solving the Problems

[0009] An embodiment of the first aspect of the present disclosure provides an explosion-proof valve, which includes an explosion-proof valve body. The explosion-proof valve body has a connection portion at its edge, and a grooved portion is provided on the explosion-proof valve body. The explosion-proof valve body has an opening region, which is disposed radially inward of the connection portion. The shape of the orthographic projection of the explosion-proof valve body and the shape of the orthographic projection of the opening region in the depth direction of the grooved portion are both non-circular. The outer edge of the orthographic projection of the opening region is a predetermined opening boundary, and the area of the orthographic projection of the opening region is S open is defined as such, the area of the orthographic projection of the connection portion is S connect is defined as such, the area of the orthographic projection of the explosion-proof valve body is S total is defined as such, S open , S connect , and S total satisfy 10% < S connect / (S total - S open ) < 65%, and S open , S connect , and S total are measured in mm 2 .

[0010] According to the explosion-proof valve of the embodiment of the present disclosure, S open , S connect , and S total satisfy 10% < S connect / (S total - S open)By setting it to be less than 65%, the accurate design of the parameters of the explosion-proof valve can effectively improve the connection stability and connection strength of the connection part 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 pressure of the battery is released. Thereby, due to the weak connection strength of the explosion-proof valve, the problem in the prior art that the explosion-proof valve is opened so as to be completely blown away and affects the safety of the battery is effectively avoided. In other words, by using the explosion-proof valve according to the embodiments of the present disclosure, the safety of the battery and the entire battery system can be effectively ensured.

[0011] In some examples, the shape of the orthographic projection of the opening area in the depth direction of the engraved groove is an ellipse, and the engraved groove includes two first straight line segments arranged parallel to each other and two first arc segments arranged on opposite sides. Each of the two ends of each first straight line segment is connected to the two first arc segments respectively, and the two first straight line segments and the two first arc segments form a closed annular structure. The outer edge of the orthographic projection of the engraved groove in the depth direction of the engraved groove constitutes a predetermined opening boundary.

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

[0013] In some examples, the engraved groove includes two first engraved segments that are arranged on opposite sides of each other and have an arc shape, a second engraved segment that is linear, and two third engraved segments that are arranged at intervals from each other and are linear. The second engraved segment is arranged parallel to the third engraved segments. Two ends of the second engraved segment are respectively connected to the two first engraved segments. Each of the third engraved segments is connected to the corresponding first engraved segment. In the depth direction of the engraved groove, two free ends of the outer edge of the orthographic projection of the engraved groove are connected to form a connection line, and the connection line and the outer edge of the orthographic projection of the engraved groove together constitute a predetermined opening boundary.

[0014] In some examples, the engraved groove includes a fourth engraved segment that is linear and four fifth engraved segments that are linear. Each of the two ends of the fourth engraved segment is connected to two fifth engraved segments arranged at a preset angle α. In the depth direction of the engraved groove, a fourth arc segment is defined between the free ends of the orthographic projections of the two fifth engraved segments at the same end of the fourth engraved segment. The center of the fourth arc segment is placed at the vertex of a preset angle. A fourth straight segment is defined between the free ends of the orthographic projections of the two fifth engraved segments on the same side of the fourth engraved segment. The two fourth arc segments and the two fourth straight 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 orthographic projection of the connection part includes two second straight segments arranged parallel to each other and two second arc segments arranged on opposite sides of each other. Two ends of each of the second straight segments are respectively connected to the two second arc segments. The two second straight segments and the two second arc segments together form a closed annular structure. In the depth direction of the engraved groove, the outer peripheral edge of the orthographic projection of the connection part is the outer peripheral edge of the orthographic projection of the explosion-proof valve body.

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

[0017] In some examples, the connecting portion is in the shape of an elongated ring extending in the circumferential direction of the explosion-proof valve body, and the inner peripheral edge of the orthographic projection of the connecting portion in the depth direction of the engraved groove includes two third straight line segments arranged parallel to each other and two third arc segments arranged on opposite sides of each other. Each of the two ends of each of the third straight line segments is connected to the two third arc segments respectively, and the distance between the two third straight line segments is B1, where S connect and B 1 are, respectively, S connect =S total -πB 1 2 / 4 - B 1 ×A, and 9 mm ≤ B 1 ≤ 59 mm are satisfied.

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

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

[0020] An embodiment of the second aspect of the present disclosure provides a battery including an explosion-proof valve according to the 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] One embodiment of a 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] One embodiment of a 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] One embodiment of a 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] Further aspects and advantages of the present disclosure will be given in part in the following description, become in part apparent from the following, or will be understood through the 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 description of the embodiments in connection with the accompanying drawings.

Brief Description of the Drawings

[0027]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Modes for Carrying Out the Invention

[0028] Embodiments of the present disclosure will be described in detail below. The embodiments described with reference to the accompanying drawings are merely examples. The explosion-proof valve 200 according to the embodiments of the present disclosure will be 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 the battery 300. When the internal pressure of the battery 300 increases, the explosion-proof valve 200 is configured to release the pressure inside the battery 300.

[0029] As shown in FIG. 1, an 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 grooved channel 21 is provided on the explosion-proof valve body 100. The shape of the orthographic projection of the explosion-proof valve body 100 in the depth direction of the grooved channel 21 (that is, the direction from the upper part of the grooved channel 21 to the bottom of the grooved channel) is non-circular. With such a configuration, the non-circular explosion-proof valve body 100 can be well adapted to 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 part 10 at its edge. When the explosion-proof valve 200 is mounted 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 part 10. When the explosion-proof valve body 100 is fixed to the housing of the battery 300 by welding, a welding seam is formed between the explosion-proof valve body 100 and the housing. Alternatively, when the explosion-proof valve body 100 is fixed to the cover plate of the battery 300 by welding, a welding 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 at a position half the width of the welding seam. The width of the welding seam is the distance between the outer contour and the inner contour of the orthographic projection of the welding seam in the depth direction of the grooved channel 21. In the depth direction of the grooved channel 21, the overlapping part of the orthographic projection of the welding seam and the orthographic projection of the explosion-proof valve body 100 is the orthographic projection of the connection part. In other words, the outer peripheral edge of the connection part 10 coincides with the outer peripheral edge of the explosion-proof valve body 100, and the inner peripheral edge of the connection part 10 coincides with the inner peripheral edge of the welding seam. The "inner peripheral edge of the welding seam" refers to the edge of the welding seam on the side closer to the center of the explosion-proof valve 200.

[0031] The explosion-proof valve body 100 has an opening region 20. The shape of the orthographic projection of the opening region 20 in the depth direction of the engraved groove 21 is non-circular. For example, the shape of the orthographic projection of the opening region 20 may be the same as the shape of the orthographic projection of the explosion-proof valve 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 body 100 may extend along the predetermined opening boundary 201. The opening region 20 is disposed radially inward of the connecting portion 10. When the internal pressure of the battery 300 increases, the pressure can be smoothly released through the explosion-proof valve 200, and the battery 300 can be protected. In the depth direction of the engraved groove 21, the area of the orthographic projection of the opening region 20 is S open is defined as such, the area of the orthographic projection of the connecting portion 10 is S connect is defined as such, and the area of the orthographic projection of the explosion-proof valve body 100 is S total is defined as such. S open , S connect , and S total satisfy 10% < S connect / (S total - S open ) < 65%, and S open , S connect , and S total are measured in mm 2 .

[0032] For example, if S connect / (S total - S open ) ≤ 10% and S total remains unchanged, at least one of S connect and S open is relatively small, which may lead to a decrease in the connection stability between the explosion-proof valve 200 and the battery 300 and does not contribute to the smooth opening of the opening region 20. If S connect / (S total - S open ) ≥ 65% and S total remains unchanged, at least one of S connect and S openAt least one of them is relatively large, which may lead to excessive high strength of the connecting portion 10 and waste of materials, or the area of the opening region 20 may become large, which may affect the opening performance of the opening region 20. Therefore, by determining the ratio of the area of the orthographic projection of the connecting portion 10 to the area of the orthographic projection of the explosion-proof valve 200 excluding the opening region 20 to be 10% - 65%, it is possible to ensure both the connection strength of the connecting portion 10 and the opening performance of the opening region 20, and it is possible to more accurately obtain the degree of stability of the explosion-proof valve 200.

[0033] S connect / (S total -S open ) The larger the value is, the higher the connection strength between the connecting portion 10 and the battery 300 becomes, and it can be seen that the stability of the explosion-proof valve 200 is improved. For example, S connect / (S total -S open ) The value of S connect may be increased by increasing S open , or by increasing S connect and S open both.

[0034] According to the explosion-proof valve 200 of the embodiment of the present disclosure, S open , S connect , and S total are such that 10% < S connect / (S total -S open)By setting to satisfy <65%, the accurate design of the parameters of the explosion-proof valve 200 can effectively improve the connection stability and connection strength of the connection part 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. Therefore, when the pressure of the battery 300 is released, the opening area 20 can be smoothly opened, thereby effectively avoiding the problem in the prior art that the explosion-proof valve 200 opens so as to be completely blown away due to the weak connection strength of the explosion-proof valve 200, and thus avoiding the influence on the safety of the battery 300. In other words, by using the explosion-proof valve 200 according to the embodiment of the present disclosure, the safety of the battery 300 and the entire battery system can be effectively ensured.

[0035] In some embodiments, 80 mm 2 ≦S open ≦1600 mm 2 and 178.5 mm 2 ≦S total ≦5212.5 mm 2 That is. Such a configuration can not only ensure that the explosion-proof valve 200 has sufficient pressure relief ability, 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 shape of the orthographic projection of the opening region 20 in the depth direction of the engraved groove 21 may be elliptical. Such a configuration can be well adapted to the explosion-proof valve 200 and can also be adapted to the shape of the housing or cover plate (not shown) of the battery 300 using the explosion-proof valve 200. Also, compared with the circular explosion-proof valve 200, the elliptical opening region 20 can discharge a larger amount of gas per unit time, thus realizing a better pressure relief effect. The engraved groove 21 includes two first straight segments 211 arranged parallel to each other and two first arc segments 212 arranged on opposite sides of each other. Each of the two ends of the two first straight segments 211 is connected to the two first arc segments 212, respectively, whereby the engraved groove 21 can form a closed annular structure. The outer edge of the orthographic projection of the engraved groove 21 in the depth direction of the engraved groove 21 constitutes a predetermined opening boundary 201. That is, the area of the region defined by the outer edges of the two first straight segments 211 and the two first arc segments 212 is the area of the orthographic projection of the opening region 20.

[0037] The length of each of the first straight segments 211 is set as a, and the distance between the outsides of the two first straight segments 211 is set as b, where S open , a, and b are, respectively, S open =a×b + πb 2 / 4, 10 mm ≤ a ≤ 50 mm, and 3 mm ≤ b ≤ 30 mm are satisfied. 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, it is ensured that the opening region 20 can be smoothly opened and the pressure can be released in a timely manner, while improving the safety of the battery 300 using the explosion-proof valve 200. It can be understood that the outside of the first straight segment 211 is the side of the first straight segment 211 that is away from the center of the explosion-proof valve 200.

[0038] The cross-section of the engraved groove 21 may be rectangular or trapezoidal in reverse. Here, the "cross-section" refers to a plane parallel to the depth direction of the engraved groove 21. When the cross-section of the engraved groove 21 is trapezoidal in reverse, the width of the engraved groove 21 gradually decreases toward the groove bottom of the engraved groove 21. In this case, a may be understood as the length of the outer edge of the first linear segment 211 at the upper part or the opening of the groove, and b may be understood as the diameter of the outer edge of the first arc segment 212 at the upper part or the opening of the groove. In other words, in the depth direction of the engraved groove 21 (that is, in the direction from the upper part of the engraved groove 21 to the groove bottom), the outer edge of the orthographic projection of the engraved groove 21 includes two semi-circles on opposite sides of each other. b may be understood as the diameter of the semi-circle, and a may be understood as the distance between the centers of the two semi-circles.

[0039] In some embodiments, as shown in FIG. 2, the engraved groove 21 is a C-shaped engraved groove. The engraved groove 21 includes two first engraved segments 213 that are arranged on opposite sides of each other and have an arc shape, a second engraved segment 214 that has a linear shape, and two third engraved segments 215 that are arranged at intervals from each other and have a linear shape. The second engraved segment 214 is arranged parallel to the third engraved segment 215. The two end portions of the second engraved segment 214 are respectively connected to the two first engraved segments 213. Each of the third engraved segments 215 is connected to the corresponding first engraved segment 213. In other words, the second engraved segment 214 is connected to one end portion of each of the two first engraved segments 213. The other end portion of each of the two first engraved segments 213 is respectively connected to one third engraved segment 215. The two third engraved segments 215 are arranged at intervals from each other. In the depth direction of the engraved groove 21, the two free end portions of the outer edge of the orthographic projection of the engraved groove 21 are connected to form a connection line 216. The outer edge of the orthographic projection of the engraved groove 21 and the connection line 216 together constitute a predetermined opening boundary 201. In this case, the area of the region defined within the predetermined opening boundary 201 (that is, the area of the orthographic projection of the opening region 20 in the depth direction of the engraved groove 21) is S c is set to c = a 1×b 1 +π×b 1 2 It is / 4. The total length of the engraved groove 21 is L c and L c =2a 1 -c 1 +πb 1 where a 1 represents the length of the second engraved segment 214, b 1 represents the distance between the outer side of the second engraved segment 214 and the outer side of the third engraved segment 215, and c 1 represents the distance between two third engraved segments 215. c 1 is the length of the connecting line 216.

[0040] The cross-section of the engraved groove 21 may be rectangular or trapezoidal in reverse. Here, the "cross-section" refers to a plane parallel to the depth direction of the engraved groove 21. When the cross-section of the engraved groove 21 is trapezoidal in reverse, the width of the engraved groove 21 gradually decreases toward the groove bottom of the engraved groove 21. In this case, a 1 may be understood as the length of the outer edge of the second engraved segment 214 at the upper part of the groove or the opening, and b 1 may be understood as the diameter of the outer edge of the first engraved segment 213 at the upper part of the groove or the opening. In other words, in the depth direction of the engraved groove 21 (that is, in the direction from the upper part of the groove of the engraved groove 21 to the groove bottom), the outer edge of the orthographic projection of the engraved groove 21 includes two semi-circles on opposite sides of each other, and b 1 may be understood as the diameter of the semi-circle, and a 1 may be understood as the distance between the centers of the two semi-circles.

[0041] In some other embodiments, as shown in FIG. 3, the engraved groove 21 is a double-headed Y-shaped engraved groove. The engraved groove 21 includes a fourth engraved segment 217 having a linear shape and four fifth engraved segments 218 having a linear shape. Each of the two ends of the fourth engraved segment 217 is connected to two fifth engraved segments 218 arranged at a preset angle. The preset angle is α. In the depth direction of the engraved groove 21, a fourth arc segment 219 is defined between the free ends of the orthographic projections of the two fifth engraved segments 218 at the same end of the fourth engraved segment 217. The center of the fourth arc segment 219 is placed at the apex of a preset angle (i.e., α). In the depth direction of the engraved groove 21, a fourth straight segment 220 is defined between the free ends of the orthographic projections of the two fifth engraved segments 218 on the same side of the fourth engraved segment 217. The two fourth arc segments 219 and the two fourth straight segments 220 together form a predetermined opening boundary 201.

[0042] Note that since the widths of the fourth engraved segment 217 and the fifth engraved segment 218 are relatively small and may be ignored, the fourth arc segment 219 and the fourth straight segment 220 intersect at almost a single point. The fourth arc segment 219 may be understood to be defined by the free ends E on opposite sides of the orthographic projections of the two fifth engraved segments 218 arranged at the same end of the fourth engraved segment 217. The fourth straight segment 220 may be understood to be defined by the free ends F on opposite sides of the orthographic projections of the two fifth engraved segments 218 arranged on the same side of the fourth engraved segment 217. For example, in the example of FIG. 3, the "fourth arc segment 219" refers to the arc between the free ends E of the two fifth engraved segments 218 arranged 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 arranged at the right end of the fourth engraved segment 217. The "fourth straight segment 220" refers to the straight line between the free ends F of the two fifth engraved segments 218 arranged above the fourth engraved segment 217, and the straight line between the free ends F of the two fifth engraved segments 218 arranged 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 free endpoints on the opposite sides 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 free endpoints on the opposite sides of the two fifth engraved segments 218 disposed on the same side of the fourth engraved segment 217. As shown in FIG. 3, in the direction 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, and 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 orthographic projection of the opening region 20 in the depth direction of the engraved groove 21) is S double-y is taken as [Number] and the total length of the engraved groove 21 is L double-y = a 2 + 4c 2 where a 2 represents the length of the fourth engraved segment 217, b 2 represents the distance between the free ends of the two fifth engraved segments 218 disposed on the same side of the fourth engraved segment 217, and c 2 represents the length of the fifth engraved segment 218.

[0044] Therefore, due to the different shapes of the engraved grooves 21, the structural strength of the opening region 20 can vary. Appropriate engraved grooves 21 may be selected according to various design specifications, thereby reducing the difficulty of the manufacturing process of the explosion-proof valve 200, increasing the pressure relief 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 region 20 outward, so the possibility of deforming the opening region 20 becomes higher. The C-shaped engraved groove or the double-headed Y-shaped engraved groove can increase the deformation of the opening region 20 to a certain extent and relatively improve the structural strength of the opening region 20, thereby effectively preventing the unintended opening of the explosion-proof valve 200.

[0045] Furthermore, the cross-section of the engraved groove 21 may be rectangular or trapezoidal in reverse. Here, the "cross-section" refers to a plane parallel to the depth direction of the engraved groove 21. When the cross-section of the engraved groove 21 is trapezoidal in reverse, the width of the engraved groove 21 gradually decreases toward the groove bottom of the engraved groove 21. In this case, a 2 may be understood as the length of the outer edge of the fourth engraved segment 217 at the upper part or the opening of the groove, and b 2 may be understood as the distance between the free ends of the two fifth engraved segments 218 arranged on the same side of the fourth engraved segment 217 at the upper part or the opening of the groove, and c 2 may be understood as the length of the outer edge of the fifth engraved segment 218 at the upper part or the opening of the groove.

[0046] In some embodiments, as shown in FIG. 1, in the depth direction of the engraved groove 21, the outer peripheral edge of the orthographic projection of the connecting portion 10 includes two second straight line segments 11 arranged parallel to each other and two second arc segments 12 arranged on opposite sides of each other. Each of the two ends of the second straight line segment 11 is 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 engraved groove 21, the outer peripheral edge of the orthographic projection of the connecting portion 10 is the outer peripheral edge of the orthographic projection of the explosion-proof valve body 100. The length of each of the second straight line segments 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 total ) of the orthographic projection of the explosion-proof valve body 100 may include two semi-circles having a radius of 1 / 2B and a rectangle having a length of A and a width of B.

[0047] S total , A, and B respectively satisfy S total =A×B + πB 2 / 4, 10 mm ≤ A ≤ 70 mm, and 10 mm ≤ B ≤ 60 mm. Therefore, by setting the dimensions of A and B of the explosion-proof valve body 100 within the above ranges, the value of the area S total of the orthographic projection of the explosion-proof valve body 100 in the depth direction of the engraved groove 21 is controlled within a reasonable range, can adapt to batteries 300 of various sizes, and can 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] Furthermore, referring to FIG. 1, the connecting portion 10 is an elongated ring shape extending in the circumferential direction of the explosion-proof valve body 100, and the outer peripheral edge portion of the connecting portion 10 is the outer peripheral edge portion of the explosion-proof valve body 100. The inner peripheral edge portion of the orthographic projection of the connecting portion 10 in the depth direction of the engraved groove 21 includes two third straight line segments 13 arranged parallel to each other and two third arc segments 14 arranged on opposite sides. Each of the two end portions of the third straight line segment 13 is connected to the two third arc segments 14 respectively. The distance between the two third straight line segments 13 is B 1 is defined as. S connect and B 1 are respectively S connect = S total -πB 1 2 / 4 - B 1 × A, and 9 mm ≤ B 1 ≤ 59 mm is satisfied. In other words, the area S connect of the connecting portion 10 may be the difference between the area defined by the boundary surrounded by the two second straight line segments 11 and the two second arc segments 12 and the area defined by the boundary surrounded by the two third straight line segments 13 and the two third arc segments 14.

[0049] B 1 < 10 mm, the area S connect of the connecting portion 10 increases, and the area S open of the opening region 20 may not be ensured, which may affect the normal pressure relief of the explosion-proof valve 200. B 1 > 60 mm, the area S connect of the connecting portion 10 decreases, which may reduce the connection stability of the connecting portion 10. When the internal pressure of the battery 300 is too high, the entire explosion-proof valve 200 is likely to open so as to be blown away, affecting the safety of the battery 300 and the entire battery system. Therefore, S connect = S total -πB 1 2 / 4 - B 1 × A is set so that, B 1By defining the value range, 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 the normal pressure relief of the explosion-proof valve 200.

[0050] Optionally, the explosion-proof valve body 100 may be configured to be oval or racetrack-shaped. Therefore, the explosion-proof valve 200 can be well adapted 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 relief performance of the explosion-proof valve 200.

[0051] An embodiment of the second aspect of the present disclosure provides a battery 300 including the explosion-proof valve 200 according to the embodiment of the first aspect, as shown in FIG. 4.

[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 part 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, by using the explosion-proof valve 200, it is possible to realize both a reliable connection between the explosion-proof valve 200 and the battery 300 and a good pressure relief ability, and the use safety of the battery 300 can be improved.

[0054] In some embodiments, the energy density of battery 300 is E. 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 battery 300 is increased, and the overall performance of battery 300 is improved. Furthermore, the greater the energy of battery 300, the greater the amount of active material required in battery 300 or the higher the activity of the material. Such a battery 300 requires a more accurate design of the amount of gas discharged through explosion-proof valve 200 to ensure timely release of explosion-proof valve 200 in extreme cases and avoid unintended activation. The explosion-proof valve 200 of the above embodiments 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 a battery 300 according to the embodiment of the second aspect, as shown in FIG. 4. For example, battery module 400 may include a plurality of batteries 300 arranged side by side. Battery module 400 may further include two end plates (not shown) and two side plates (not shown). The two end plates are arranged at the two ends of each of the plurality of batteries 300 in the first direction. The two side plates are arranged at the 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 battery 300. The first direction is perpendicular to the second direction. Of course, in other embodiments, battery module 400 may further include two end plates and a binding band (not shown), the two end plates are arranged at the two ends of each of the plurality of batteries 300, and are fixed by the binding band.

[0056] By using battery 300 in battery module 400 according to the embodiments of the present disclosure, the use safety of battery module 400 is improved.

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

[0058] By using the battery 300 or the battery module 400 in the battery pack 500 according to an embodiment of the present disclosure, the use safety of the battery pack 500 can be improved. 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 the vehicle 600, the battery pack 500 is mounted on the vehicle 600 through the tray.

[0059] An embodiment of the fifth aspect of the present disclosure provides a vehicle 600 including the battery 300 according to the embodiment of the second aspect or the battery pack 500 according to the embodiment of the fourth aspect, as shown in FIGS. 4 to 6. For example, in some embodiments, the battery 300 may be directly mounted on the vehicle 600. In some other embodiments, the battery 300 is assembled into the 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 use safety of the vehicle 600 can be improved.

[0061] Optionally, the explosion-proof valve 200 may be arranged downward to prevent the discharged high-temperature gas from injuring the passengers in the vehicle 600.

[0062] In the description of the present disclosure, the orientation or positional relationship indicated by terms such as "center", "length", "width", "thickness", "above", "below", "horizontal", "upper", "bottom", "inside", and "outside" is based on the orientation or positional relationship shown in the accompanying drawings, and does not indicate or imply that the referred device or component needs to have a specific orientation or needs to be constructed and operated in a specific orientation. It should be understood that it is only used for the purpose of facilitating the illustration and explanation and simplifying. Therefore, such terms should not be construed as limiting the present disclosure.

[0063] In the description of the present disclosure, the "first feature" and the "second feature" may include one or more features. In the description of the present disclosure, "multiple" or "a plurality of" means two or more. In the description of the present disclosure, when the first feature is "above" or "below" the second feature, it may mean that the first feature and the second feature are in direct contact, or it may mean that the first feature and the second feature are not in direct contact and are in contact through another feature therebetween. In the description of the present disclosure, when the first feature is "over", "above", or "on" the second feature, it includes that the first feature may be directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than the horizontal height of the second feature.

[0064] In the description of this specification, descriptions of terms such as "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials, or characteristics described with respect to the embodiments or examples are included in at least one embodiment or example of the present disclosure. In this specification, the exemplary descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0065] Although embodiments of the present disclosure have been illustrated and described, those skilled in the art may make various changes, modifications, substitutions, and variations to the embodiments without departing from the principles and spirit of the present disclosure. It should be understood that the scope of the present disclosure is defined by the appended claims and their equivalents.

Description of Reference Numerals

[0066] 100 Explosion-proof valve body 10 Connection part 11 Second straight segment 12 Second arc segment 13 Third straight segment 14 Third arc segment 20 Opening area 201 Specified opening boundary 21 Engraved groove 211 First straight 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 Fifth engraved segment 219 Fourth arc segment 220 Fourth straight segment 200 Explosion-proof valve 300 Battery 400 Battery module 500 Battery pack 600 Vehicle

Claims

1. An explosion-proof valve body (100) is provided, and the explosion-proof valve body (100) has a connection part (10) at its edge. A grooved channel (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 arranged radially inside the connection part (10). The shape of the orthographic projection of the explosion-proof valve body (100) and the shape of the orthographic projection of the opening region (20) in the depth direction of the grooved channel (21) are both non-circular. The outer edge of the orthographic projection of the opening region (20) is a predetermined opening boundary (201). The area of the orthographic projection of the opening region (20) is S ｏｐｅｎ and the area of the orthographic projection of the connecting portion (10) is S ｃｏｎｎｅｃｔ and the area of the orthographic projection of the explosion-proof valve body (100) is S ｔｏｔａｌ where S ｏｐｅｎ , S ｃｏｎｎｅｃｔ , and S ｔｏｔａｌ satisfy 10% < S ｃｏｎｎｅｃｔ / (S ｔｏｔａｌ - S ｏｐｅｎ ) < 65%, and S ｏｐｅｎ , S ｃｏｎｎｅｃｔ , and S ｔｏｔａｌ are measured in mm ２ . An explosion-proof valve (200).

2. The shape of the orthographic projection of the opening region (20) in the depth direction of the grooved channel (21) is elliptical. The grooved channel (21) includes two first straight segments (211) arranged parallel to each other and two first arc segments (212) arranged on opposite sides. Each of the two ends of each first straight segment (211) is connected to the two first arc segments (212) respectively. The two first straight segments (211) and the two first arc segments (212) form a closed annular structure. The outer edge of the orthographic projection of the grooved channel (21) in the depth direction of the grooved channel (21) constitutes the predetermined opening boundary (201). The explosion-proof valve (200) according to Claim 1.

3. The length of each of the first straight segments (211) is set to a, and the distance between the outsides of the two first straight segments (211) is set to b, where S ｏｐｅｎ , a, and b are, respectively, S ｏｐｅｎ = a×b + πb ２ / 4, 10 mm ≤ a ≤ 50 mm, and 3 mm ≤ b ≤ 30 mm are satisfied, the explosion-proof valve (200) according to claim 2.

4. The grooved channel (21) includes two first grooved segments (213) arranged on opposite sides and having an arc shape, a second grooved segment (214) having a linear shape, and two third grooved segments (215) arranged at intervals from each other and having a linear shape. The second grooved segment (214) is arranged parallel to the third grooved segment (215). Each of the two ends of the second grooved segment (214) is connected to the two first grooved segments (213) respectively. Each of the third grooved segments (215) is connected to the corresponding first grooved segment (213). In the depth direction of the engraved groove (21), two free ends of the outer edge of the orthographic projection of the engraved groove (21) are connected to form a connection line (216), and the connection line (216) and the outer edge of the orthographic projection of the engraved groove (21) together constitute the predetermined opening boundary (201). The explosion-proof valve (200) according to claim 1.

5. The engraved groove (21) includes a fourth engraved segment (217) having a linear shape and four fifth engraved segments (218) having a linear shape. Each of the two ends of the fourth engraved segment (217) is connected to two fifth engraved segments (218) arranged at a preset angle α. In the depth direction of the engraved groove (21), a fourth arc segment (219) is defined between the free ends of the orthographic projections of the two fifth engraved segments (218) at the same end of the fourth engraved segment (217). The center of the fourth arc segment (219) is placed at the vertex of the preset angle, and a fourth straight segment (220) is defined between the free ends of the orthographic projections of the two fifth engraved segments (218) on the same side of the fourth engraved segment (217). The two fourth arc segments (219) and the two fourth straight segments (220) together constitute the predetermined opening boundary (201). The explosion-proof valve (200) according to claim 1.

6. In the depth direction of the engraved groove (21), the outer peripheral edge of the orthographic projection of the connecting portion (10) includes two second straight segments (11) arranged parallel to each other and two second arc segments (12) arranged on opposite sides. Each of the two ends of each of the second straight segments (11) is connected to the two second arc segments (12), and the two second straight segments (11) and the two second arc segments (12) constitute a closed annular structure. In the depth direction of the engraved groove (21), the outer peripheral edge of the orthographic projection of the connecting portion (10) is the outer peripheral edge of the orthographic projection of the explosion-proof valve body (100). The explosion-proof valve (200) according to any one of claims 1 to 5.

7. The length of each of the second straight segments (11) is A, and the distance between the two second straight segments (11) is B, where S ｔｏｔａｌ , A, and B are each S ｔｏｔａｌ = A×B + πB ２ / 4, 10 mm ≤ A ≤ 70 mm, and 10 mm ≤ B ≤ 60 mm, the explosion-proof valve (200) according to claim 6.

8. The connecting portion (10) has an elongated ring shape extending in the circumferential direction of the explosion-proof valve body (100). The inner peripheral edge of the orthographic projection of the connecting portion (10) in the depth direction of the engraved groove (21) includes two third straight line segments (13) arranged in parallel with each other and two third arc segments (14) arranged on opposite sides of each other. Each of the two end portions of the third straight line segment (13) is connected to the two third arc segments (14) respectively, and the distance between the two third straight line segments (13) is B １ is defined as, where S ｃｏｎｎｅｃｔ and B １ are respectively S ｃｏｎｎｅｃｔ = S ｔｏｔａｌ - πB １ ２ / 4 - B １ × A, and 9 mm ≤ B １ ≤ 59 mm, and the explosion-proof valve (200) according to claim 7

9. The explosion-proof valve body (100) is oval or racetrack-shaped. The explosion-proof valve (200) according to any one of claims 1 to 8.

10. 80 mm ２ ≤ S ｏｐｅｎ ≤ 1600 mm ２ and 178.5 mm ２ ≤ S ｔｏｔａｌ ≤ 5212.5 mm ２ The explosion - proof valve (200) according to any one of claims 1 to 9, wherein this is the case.

11. A battery (300) comprising the explosion-proof valve (300) according to any one of claims 1 to 10.

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

13. A battery module (400) comprising the battery (300) according to claim 11 or 12.

14. A battery pack (500) comprising the battery (300) according to claim 11 or 12 or the battery module (400) according to claim 13.

15. A vehicle (600) comprising the battery (300) according to claim 11 or 12 or the battery pack (500) according to claim 14.

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