Explosion-proof structure, battery and electric equipment

Abstract

The utility model provides an explosion-proof structure, a battery and electric equipment, and relates to the technical field of batteries, the explosion-proof structure comprises a body provided with explosion-proof nicks, and an area enclosed by the explosion-proof nicks forms an explosion-proof membrane; a second nick and a third nick of the anti-explosion nick are located on the two sides of the first nick respectively, the end of the second nick and the end of the third nick intersect at the end of the first nick, and the length of the second nick and the length of the third nick are smaller than the length of the first nick; a first valve of the explosion-proof membrane is formed by an area defined by the first nick and the second nicks located at the two ends of the first nick, and a second valve of the explosion-proof membrane is formed by an area defined by the first nick and the third nicks located at the two ends of the first nick. Therefore, the explosion-proof membrane is formed on the body, so that the processing and assembling procedures are reduced, the production efficiency and the product percent of pass are improved, and the explosion-proof membrane consists of the two valves and can be cracked in the middle, so that the explosion-proof membrane is opened in a fixed direction while the peripheral battery cells are protected.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to an explosion-proof structure, a battery and electrical equipment. Background Art

[0002] The explosion-proof valve is a safety component of lithium batteries, which is usually installed on the battery casing / cover. When the pressure inside the battery exceeds the opening pressure of the explosion-proof valve, the explosion-proof valve opens to discharge the high-pressure gas inside the battery to prevent the internal pressure of the battery from continuing to increase, thereby delaying the progress of battery safety out of control and reducing the degree of battery pack out of control.

[0003] At present, the opening direction of traditional explosion-proof valves cannot be fixed due to the limitation of the one-way structural characteristics. As a result, after the explosion-proof valve is opened, high-temperature airflow, electrolyte, etc. are easily splashed to the surrounding battery cells, causing pollution. In addition, traditional explosion-proof valves are usually welded to the battery shell / cover as components. Therefore, it is necessary to first process the installation part of the explosion-proof valve on the battery shell / cover. Before welding the explosion-proof valve to the shell / cover, the explosion-proof valve needs to go through stamping, cleaning, heat treatment and other processing procedures. After passing the inspection, it is laser welded and assembled with the battery shell / cover. This not only makes the parts processing and assembly process of the explosion-proof valve more cumbersome and the production efficiency is low, but also easily causes the entire battery shell / cover to be defective or scrapped. Utility Model Content

[0004] The problem solved by the utility model is: how to improve the production efficiency and product qualification rate of explosion-proof valves, and reduce the pollution degree of surrounding electric cores after the explosion-proof valves are opened.

[0005] In order to solve the above problems, the utility model provides an explosion-proof structure, a battery and an electrical device.

[0006] In a first aspect, the utility model provides an explosion-proof structure, comprising a body, an explosion-proof notch is provided on the outer surface of the body, and an area surrounded by the explosion-proof notch forms an explosion-proof membrane;

[0007] The explosion-proof notch includes a first notch, a second notch and a third notch, the second notch and the third notch are provided at both ends of the first notch, the second notch and the third notch are respectively located on both sides of the first notch, the ends of the second notch and the third notch intersect at the end of the first notch, and the lengths of the second notch and the third notch are respectively less than the length of the first notch;

[0008] The explosion-proof membrane includes a first valve and a second valve. The first valve is formed by an area surrounded by the first notch and the second notch located at both ends of the first notch. The second valve is formed by an area surrounded by the first notch and the third notch located at both ends of the first notch.

[0009] Optionally, the explosion-proof notch also includes a fourth notch and a fifth notch, the fourth notch is located on a side of the second notch away from the third notch, and is connected to an end of the second notch away from the first notch, the fifth notch is located on a side of the third notch away from the second notch, and is connected to an end of the third notch away from the first notch, the first notch and the second notch, the first notch and the third notch, the second notch and the third notch, the fourth notch and the second notch, and the fifth notch and the third notch are all arranged at an angle, and the length of the fourth notch is less than the length of the second notch, and the length of the fifth notch is less than the length of the third notch.

[0010] Optionally, a guide notch is provided on the inner surface of the body, and the area enclosed by the guide notch and the explosion-proof notch forms the explosion-proof membrane. The guide notch is arranged parallel to the first notch, and one guide notch is provided on each side of the first notch.

[0011] Optionally, the outer surface of the body is further provided with a first extension notch, each free end of the explosion-proof notch is respectively connected to the first extension notch, and the first extension notch extends away from one end of the explosion-proof notch to the position where the end of the corresponding guide notch is located;

[0012] And / or, the inner surface of the body is further provided with a second extension score, both ends of the guide score are respectively connected to the second extension score, and the second extension score extends away from one end of the guide score to the position of the free end of the corresponding explosion-proof score.

[0013] Optionally, a first reinforcing structure is provided on the first valve, and a second reinforcing structure is provided on the second valve, the first reinforcing structure is formed by the first valve protruding toward the inner side of the body, or by the first valve protruding toward the outer side of the body, and the second reinforcing structure is formed by the second valve protruding toward the inner side of the body, or by the second valve protruding toward the outer side of the body; wherein the inner side of the body is the side where the inner surface of the body is located, and the outer side of the body is the side where the outer surface of the body is located.

[0014] Optionally, the first valve is further provided with a first reinforcement groove, the first reinforcement groove divides the first reinforcement structure into a first boss portion, a second boss portion and a third boss portion, the first boss portion is arranged along an edge of the second notch located at one end of the first notch and a portion of an edge of the first notch, the second boss portion is arranged along an edge of the second notch located at the other end of the first notch and another portion of an edge of the first notch, the third boss portion extends in a direction parallel to the first notch and is located on a side of the first boss portion and the second boss portion that is away from the second reinforcement structure;

[0015] The first reinforcement groove includes a first groove, a second groove and a third groove. The gap between the first boss portion and the third boss portion constitutes the first groove, the gap between the second boss portion and the third boss portion constitutes the second groove, and the gap between the first boss portion and the second boss portion constitutes the third groove. The third groove corresponds to the middle position of the first notch, and the first groove and the second groove intersect at the third groove.

[0016] Optionally, a third reinforcement groove is further provided on the first valve, and the third reinforcement groove is provided at the groove bottom of the first reinforcement groove and extends along the extension direction of the first reinforcement groove.

[0017] Optionally, the ratio of the length a of the first notch to the length b of the second notch is between 12 and 13, and / or the ratio of the length a of the first notch to the length d of the fourth notch is between 29 and 30, and / or the angle β formed by the second notch and the third notch is between 80° and 160°, and / or the angle θ formed by the second notch and the fourth notch is between 60° and 140°, and / or the angle δ formed by the fourth notch and the first extension notch is between 100° and 180°, and / or the residual material degree t of the body at the explosion-proof notch is between 0.05 mm and 0.15 mm.

[0018] In a second aspect, the utility model provides a battery, comprising the explosion-proof structure as described above.

[0019] In a third aspect, the utility model provides an electrical device, including the explosion-proof structure as described above, or including the battery as described above.

[0020] The beneficial effect of the explosion-proof structure of the utility model is that explosion-proof notches can be set on the outer surface of the body such as the battery shell or the battery cover, and the explosion-proof membrane can be formed by the area surrounded by the explosion-proof notches, so that the explosion-proof membrane used as an explosion-proof valve to achieve exhaust pressure relief can be formed on the battery shell or cover, which can not only reduce the parts processing and assembly process of the explosion-proof valve, improve production efficiency and product qualification rate, but also do not need to additionally thin the central area of ​​the explosion-proof valve to facilitate the explosion-proof valve to crack, thereby improving the utilization rate of the body material. In addition, by intersecting the ends of the second notch and the third notch of the explosion-proof notch at the end of the first notch, and forming the first valve membrane by the area surrounded by the first notch and the second notch at both ends of the first notch, and forming the second valve membrane by the area surrounded by the first notch and the third notch at both ends of the first notch, so that the explosion-proof membrane is composed of two valve membranes, so as to use the two valve membranes to protect the surrounding battery cells, and block the splashing of high-temperature airflow and electrolyte to the surrounding battery cells, thereby reducing the degree of pollution to the surrounding battery cells after the explosion-proof membrane is opened. At the same time, by setting the lengths of the second notch and the third notch to be smaller than the length of the first notch, the structural strength of the body at the second notch and the structural strength of the body at the third notch are both greater than the structural strength of the body at the first notch, so that the first notch located at the center becomes the weakest point of the explosion-proof membrane, so that the explosion-proof membrane can be cracked in the center. In this way, when the explosion-proof membrane is impacted by the internal air pressure of the battery, the explosion-proof membrane can first be cracked from the first notch. When the first notch is completely cracked, if the explosion-proof membrane is still under pressure, the explosion-proof membrane can continue to be cracked along the second notch and the third notch, so that the explosion-proof membrane can be torn from the center to both sides, which not only ensures that the explosion-proof notch can be cracked according to the preset explosion sequence, so that the explosion-proof membrane can be opened in a fixed direction, but also the design of the two valves makes the height of the explosion-proof membrane after opening half of the traditional explosion-proof valve with the same cross-section, so that the avoidance height of the battery can be reduced, and then the height of the chassis of the car can be reduced, for example, to improve the space utilization of the battery and the endurance of the whole vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the front structure of the explosion-proof structure in the embodiment of the utility model;

[0022] Figure 2 for Figure 1 A partial enlarged view of the middle part;

[0023] Figure 3 for Figure 1 Schematic diagram of the cross section at the middle BB;

[0024] Figure 4 for Figure 1 Schematic diagram of the cross section at CC in the middle;

[0025] Figure 5 This is a schematic diagram of the reverse structure of the explosion-proof structure in the embodiment of the utility model;

[0026] Figure 6 for Figure 5 A partial enlarged view of point D in the middle;

[0027] Figure 7 This is a schematic diagram of the structure when the explosion-proof membrane is cracked on the battery housing in the embodiment of the utility model;

[0028] Figure 8 It is a schematic diagram of the structure when the explosion-proof membrane is cracked on the battery cover in the embodiment of the utility model;

[0029] Fig. 9 This is a schematic diagram of the cross-sectional structure of the explosion-proof notch in the embodiment of the utility model;

[0030] Fig.10 A structural schematic diagram of another cross-sectional structure of an explosion-proof notch in an embodiment of the utility model;

[0031] Fig.11 This is a schematic diagram of the structure of the explosion-proof notch in the embodiment of the utility model;

[0032] Fig.12 It is a structural schematic diagram of another situation of the explosion-proof notch in the embodiment of the utility model;

[0033] Fig.13 It is a structural schematic diagram of another situation of explosion-proof notches in an embodiment of the utility model.

[0034] Description of reference numerals:

[0035] 1. Main body; 11. Reference plane; 12. Explosion-proof notch; 121. First notch; 122. Second notch; 123. Third notch; 124. Fourth notch; 125. Fifth notch; 13. Guide notch; 14. First extension notch; 15. Second extension notch; 2. Explosion-proof membrane; 21. First flap; 22. Second flap; 23. First reinforcement structure; 231. First boss portion; 232. Second boss portion; 233. Third boss portion; 24. Second reinforcement structure; 25. First reinforcement groove; 251. First groove; 252. Second groove; 253. Third groove; 26. Second reinforcement groove; 27. Third reinforcement groove; 28. Fourth reinforcement groove; 100. Exhaust hole. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0037] The Z axis in the accompanying drawings represents the vertical direction, that is, the up and down position, and the positive direction of the Z axis represents the top, and the reverse direction of the Z axis represents the bottom; the X axis in the accompanying drawings represents the horizontal direction, and is designated as the front and back position, and the positive direction of the X axis represents the front side, and the reverse direction of the X axis represents the back side; the Y axis in the accompanying drawings represents the left and right positions, and the positive direction of the Y axis represents the left side, and the reverse direction of the Y axis represents the right side. It should also be noted that the aforementioned Z axis, Y axis, and X axis are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] It should be noted that the terms "first", "second", etc. in the specification and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein.

[0039] Combination Figure 1 , Figure 2 , Figure 7 , Figure 8 and Fig.11 As shown, the embodiment of the utility model provides an explosion-proof structure, including a body 1, an explosion-proof notch 12 is provided on the outer surface of the body 1, and the area surrounded by the explosion-proof notch 12 forms an explosion-proof membrane 2; the explosion-proof notch 12 includes a first notch 121, a second notch 122 and a third notch 123, and the second notch 122 and the third notch 123 are provided at both ends of the first notch 121, and the second notch 122 and the third notch 123 are respectively located on both sides of the first notch 121, and the second notch 122 and the third notch 123 are respectively located on both sides of the first notch 121. The end of the third notch 123 intersects with the end of the first notch 121, and the lengths of the second notch 122 and the third notch 123 are respectively smaller than the length of the first notch 121; the explosion-proof membrane 2 includes a first valve 21 and a second valve 22, and the area surrounded by the first notch 121 and the second notch 122 located at both ends of the first notch 121 forms the first valve 21, and the area surrounded by the first notch 121 and the third notch 123 located at both ends of the first notch 121 forms the second valve 22.

[0040] It should be noted that the explosion-proof structure is generally applied to lithium batteries, and the battery housing generally includes a shell having an opening and a cover plate covering the opening of the shell. The opening of the shell may be located at the top, side or bottom of the shell, that is, the cover plate of the battery may be the top cover plate, side cover plate or bottom cover plate of the battery, wherein the body 1 of the explosion-proof structure may be the cover plate of the battery, such as Figure 8 As shown, it can also be a battery housing, such as Figure 7As shown, the explosion-proof membrane 2 is integrally formed with the body 1 and is used to crack along the explosion-proof notch 12 when the internal pressure of the battery is greater than the pressure that the explosion-proof notch 12 can withstand, so as to form an exhaust hole 100 connecting the internal and external spaces of the battery, as shown in FIG. Figure 7 and Figure 8 In practical applications, the location of the explosion-proof membrane 2 on the battery can be selected according to the layout space of the battery, for example Figure 7 and Figure 8 As shown, when the opening of the battery shell is located at the front and rear sides of the shell (that is, the shell is located on both sides of the X-axis direction), if it is necessary to realize explosive exhaust at the top, left, right or bottom of the battery, the explosion-proof membrane 2 can be set at the top, left, right or bottom of the battery shell. At this time, the body 1 is the shell of the battery. If it is necessary to realize explosive exhaust at the front or rear end of the battery, the explosion-proof membrane 2 can be set on the cover of the battery. At this time, the body 1 is the cover of the battery. In addition, the outer surface of the body 1 refers to the surface of the body 1 facing the external space of the battery, and accordingly, the outer surface of the body 1 refers to the surface of the body 1 facing the internal space of the battery.

[0041] Specifically, the explosion-proof notch 12 is usually a semi-enclosed structure, and the area enclosed by the explosion-proof notch 12 is the area enclosed by the semi-enclosed structure, and this area forms the explosion-proof membrane 2. In other words, the explosion-proof notch 12 is the connection structure between the explosion-proof membrane 2 and the body 1, so that the explosion-proof membrane 2 can be connected to the body 1 after it is cracked, and will not fly out. The explosion-proof notch 12 is usually a groove structure, and the groove structure is not formed in a concave manner, but is formed by digging out part of the structure of the body 1. Figure 2 As shown, the explosion-proof notch 12 mainly includes a first notch 121, two second notches 122 and two third notches, and the two second notches 122 are respectively arranged at the front and rear ends of the first notch 121 (i.e., the first notch 121 is located at Figure 1 The two third notches 123 are also respectively arranged at the front and rear ends of the first notch 121, and the two second notches 122 are located on the left side of the first notch 121 (i.e., the first notch 121 is located on the left side of the first notch 121). Figure 1 The two third notches 123 are located on the right side of the first notch 121 (i.e., the first notch 121 is located on the positive side of the Y axis). Figure 1At the same time, the ends of the second notch 122 and the third notch 123 located at the front end of the first notch 121 intersect with the front end of the first notch 121, and the ends of the second notch 122 and the third notch 123 located at the rear end of the first notch 121 intersect with the rear end of the first notch 121. The first notch 121 can be a linear groove, a wavy groove, or a serrated groove extending along a set direction. In practical applications, in order to facilitate processing, it is usually preferred that the first notch 121 is a linear groove, wherein the set direction can be the length direction of the body 1 (i.e. Figure 1 X-axis direction) or width direction (i.e. Figure 1 The shape of the second notch 122 can be an oblique line, a U shape, a C shape, etc., and the shapes of the second notch 122 and the third notch 123 can be the same or different. When the shapes of the second notch 122 and the third notch 123 are the same, the second notch 122 and the third notch 123 are usually symmetrically arranged on the left and right sides of the first notch 121. For example, in one example, Figure 2 and Fig.11 As shown, the second notch 122 and the third notch 123 are in the shape of oblique lines and are symmetrically arranged. In another example, as shown in FIG. Fig.12 As shown, the second notch 122 and the third notch 123 are U-shaped and symmetrically arranged.

[0042] More specifically, the area surrounded by the first notch 121 and the two second notches 122 forms the first valve 21, and the area surrounded by the first notch 121 and the two third notches 123 forms the second valve 22, so that the explosion-proof membrane 2 is composed of two left and right valves (i.e., the first valve 21 and the second valve 22), and the first notch 121 is located at the center of the entire explosion-proof membrane 2. Since the length of the notch affects the structural strength of the body 1 at the notch, for example, the longer the notch, the smaller the structural strength at the notch is generally, therefore, the lengths of the second notch 122 and the third notch 123 are respectively set to be smaller than the length of the first notch 121, so that the structural strength of the body 1 at the second notch 122 and the structural strength of the body 1 at the third notch 123 are both greater than the structural strength of the body 1 at the first notch 121, so that the first notch 121 located at the center becomes the weakest point of the explosion-proof membrane 2, so that the explosion-proof membrane 2 can be cracked in the center. When the explosion-proof membrane 2 is impacted by the internal air pressure of the battery, the explosion-proof membrane 2 can first be cracked from the first score 121. After the first score 121 is completely cracked, if the explosion-proof membrane 2 is still under pressure, the explosion-proof membrane 2 can continue to be cracked along the second score 122 and the third score 123, so that the explosion-proof membrane 2 can be torn from the center to both sides, so that the explosion-proof membrane 2 can be opened in a preset direction.

[0043] The explosion-proof structure in the present embodiment can be achieved by setting explosion-proof notches 12 on the outer surface of a main body 1 such as a battery shell or a battery cover, and forming an explosion-proof membrane 2 using the area surrounded by the explosion-proof notches 12, so that the explosion-proof membrane 2 serving as an explosion-proof valve to achieve exhaust and pressure relief can be formed on the shell or cover of the battery. This can not only reduce the parts processing and assembly procedures of the explosion-proof valve, improve production efficiency and product qualification rate, but also eliminate the need for additional thinning of the central area of ​​the explosion-proof valve to facilitate the cracking of the explosion-proof valve, thereby improving the utilization rate of the material of the main body 1. Furthermore, by intersecting the ends of the second notch 122 and the third notch 123 of the explosion-proof notch 12 at the end of the first notch 121, and forming the first valve 21 in the area surrounded by the first notch 121 and the second notch 122 located at both ends of the first notch 121, and forming the second valve 22 in the area surrounded by the first notch 121 and the third notch 123 located at both ends of the first notch 121, the explosion-proof membrane 2 is composed of two valves, so that the two valves can be used to protect the surrounding battery cells and prevent, for example, high-temperature airflow and electrolyte from splashing to the surrounding battery cells, thereby reducing the degree of contamination of the surrounding battery cells after the explosion-proof membrane 2 is opened. At the same time, by setting the lengths of the second notch 122 and the third notch 123 to be smaller than the length of the first notch 121, the structural strength of the main body 1 at the second notch 122 and the structural strength of the main body 1 at the third notch 123 are both greater than the structural strength of the main body 1 at the first notch 121, so that the first notch 121 located at the center becomes the weakest point of the explosion-proof membrane 2, so that the explosion-proof membrane 2 can crack in the center. In this way, when the explosion-proof membrane 2 is impacted by the internal air pressure of the battery, the explosion-proof membrane 2 can first crack from the first score 121. When the first score 121 is completely cracked, if the explosion-proof membrane 2 is still under pressure, the explosion-proof membrane 2 can continue to crack along the second score 122 and the third score 123, so that the explosion-proof membrane 2 can be torn from the center to both sides. It not only ensures that the explosion-proof score 12 can be cracked according to the preset blasting sequence, thereby realizing the opening of the explosion-proof membrane 2 in a fixed direction, but also the design of the two valves makes the height of the explosion-proof membrane 2 after opening half of the traditional explosion-proof valve with the same cross-section, thereby reducing the avoidance height of the battery, and then reducing the height of the car chassis, for example, to improve the space utilization of the battery and the endurance of the whole vehicle.

[0044] Furthermore, combined with Figure 2 As shown, the second notch 122 and the third notch 123 are symmetrically arranged on both sides of the first notch 121. Such arrangement can simplify the processing technology of the explosion-proof notch 12 and improve production efficiency, and on the other hand, make the first valve 21 and the second valve 22 of the explosion-proof membrane 2 present a symmetrical structure, so that the left and right valves of the explosion-proof membrane 2 can be torn open simultaneously and synchronously, thereby quickly forming the exhaust hole 100 for exhaust and pressure relief.

[0045] Optionally, combined Fig.12As shown, the second notch 122 and the third notch 123 form a V-shaped structure.

[0046] In this optional embodiment, the second notch 122 and the third notch 123 are both in the form of a diagonal groove structure, so that the second notch 122 and the third notch 123 together form a V-shaped structure, which makes the explosion-proof notch 12 connected into a whole by a straight-line notch and two V-shaped notches, which is not only simple in structure but also convenient to process.

[0047] Furthermore, combined with Fig.10 and Fig.11 As shown, when second notch 122 and third notch 123 form a V-shaped structure, the remaining material thickness t of body 1 at explosion-proof notch 12 is ≥0.6 mm, and / or, the length L of explosion-proof notch 12 is ≥36 mm, and / or, the length b of second notch 122 is ≥6 mm, and / or, the length c of third notch 123 is ≥6 mm, and / or, the sum of the vertical distances from one end of second notch 122 away from first notch 121 to first notch 121 and the vertical distances from one end of third notch 123 away from first notch 121 to first notch 121 is e ≥9 mm, and / or, the angle β formed by second notch 122 and third notch 123 is ≥90°.

[0048] If the remaining material thickness t of the body 1 at the explosion-proof notch 12 is set too small, the structural strength of the connection between the explosion-proof membrane 2 and the body 1 is relatively small, which makes the explosion-proof membrane 2 easily torn due to factors such as bumps or vibrations during transportation or vehicle driving, thereby causing the explosion-proof membrane 2 to fail. Therefore, in this embodiment, t is set to be greater than or equal to 0.6 mm to ensure that the connection between the explosion-proof membrane 2 and the body 1 has a certain strength to avoid failure of the explosion-proof membrane 2.

[0049] If the length L of the explosion-proof notch 12 (i.e. the entire explosion-proof notch 12) Fig.12 If the size in the X-axis direction is set too small, it is easy to cause the exhaust hole 100 formed after the explosion-proof membrane 2 is cracked to be small, which is not conducive to the rapid discharge of the high-temperature gas inside the battery. Therefore, in this embodiment, L is set to be greater than or equal to 36 mm to ensure that the exhaust hole 100 formed after the explosion-proof membrane 2 is cracked has a sufficiently large opening area, so that the high-temperature gas inside the battery can be quickly discharged, thereby improving the explosion-proof effect.

[0050] If the length b of the second notch 122 or the length c of the third notch 123 is set too small, the tear range of the explosion-proof membrane 2 is small, which easily leads to a small exhaust hole 100 formed after the explosion-proof membrane 2 is cracked. Therefore, in this embodiment, c is set to be greater than or equal to 6 mm to increase the tear range of the explosion-proof membrane 2, to ensure that the exhaust hole 100 formed after the explosion-proof membrane 2 is cracked has a sufficiently large opening area, so that the high-temperature gas inside the battery can be quickly discharged, thereby improving the explosion-proof effect.

[0051] If the sum e of the vertical distance from one end of the second notch 122 away from the first notch 121 (i.e., the free end of the second notch 122) to the first notch 121 and the vertical distance from one end of the third notch 123 away from the first notch 121 (i.e., the free end of the third notch 123) to the first notch 121 is set too small, or the angle β formed by the second notch 122 and the third notch 123 is set too small, it will cause the left and right valve areas of the explosion-proof membrane 2 to be smaller, and further cause the exhaust hole 100 formed after the explosion-proof membrane 2 is cracked to be smaller. Therefore, in this embodiment, e is set to be greater than or equal to 9 mm, and / or β is set to be greater than or equal to 90°, so as to ensure that the exhaust hole 100 formed after the explosion-proof membrane 2 is cracked has a sufficiently large opening area, so that the high-temperature gas inside the battery can be quickly discharged, thereby improving the explosion-proof effect.

[0052] Optionally, combined Fig.13 As shown, at least one of the second notch 122 and the third notch 123 is in a U-shaped structure, the first notch 121 is connected to one of the vertical sides of the U-shaped structure, and the openings of the U-shaped structure at both ends of the first notch 121 are arranged opposite to each other.

[0053] In this optional embodiment, at least one of the second notch 122 and the third notch 123 is a U-shaped groove structure, so that the explosion-proof notch 12 as a whole is roughly composed of two back-to-back C-shaped notches, which is not only simple in structure but also easy to process.

[0054] Optionally, combined Figure 5 and Figure 6 As shown, the inner surface of the main body 1 is provided with a guide notch 13, and the area enclosed by the guide notch 13 and the explosion-proof notch 12 forms an explosion-proof membrane 2, and the guide notch 13 is arranged parallel to the first notch 121, and a guide notch 13 is provided on each side of the first notch 121, and the first valve 21 and the second valve 22 are respectively used to fold outward at the corresponding guide notch 13.

[0055] In this embodiment, a guide notch 13 is provided on each of the left and right sides of the explosion-proof notch 12, and the structural strength of the body 1 at the guide notch 13 is greater than the structural strength at the explosion-proof notch 12. At the same time, the structural strength at the guide notch 13 satisfies that the explosion-proof membrane 2 is only folded at the guide notch 13 without being cracked. In this way, by providing the guide notch 13 on the inner surface of the body 1, the first valve 21 and the second valve 22 of the explosion-proof membrane 2 are folded outward at the corresponding guide notches 13, respectively, so that the explosion-proof membrane 2 can be fully opened under the guidance of the guide notch 13 when subjected to a large air pressure shock.

[0056] Optionally, combined Figure 2 and Figure 6As shown, the outer surface of the body 1 is further provided with a first extension notch 14, each free end of the explosion-proof notch 12 is respectively connected with the first extension notch 14, and the first extension notch 14 extends away from one end of the explosion-proof notch 12 to the position where the end of the corresponding guide notch 13 is located;

[0057] And / or, the inner surface of the body 1 is further provided with a second extension notch 15 , both ends of the guide notch 13 are respectively connected with the second extension notch 15 , and the second extension notch 15 extends away from one end of the guide notch 13 to the position of the free end of the corresponding explosion-proof notch 12 .

[0058] Specifically, when the explosion-proof score 12 only includes the first score 121, the second score 122 and the third score 123, the two second scores 122 are away from one end of the first score 121 (i.e., the free end of the second score 122) and the two third scores 123 are away from one end of the first score 121 (i.e., the free end of the third score 123) together constitute the free end of the explosion-proof score 12. When the explosion-proof score 12 includes the first score 121, the second score 122, the third score 123, the fourth score 124 and the fifth score 125, the two fourth scores 124 are away from one end of the second score 122 (i.e., the free end of the fourth score 124) and the two fifth scores 125 are away from one end of the third score 123 (i.e., the free end of the fifth score 125) together constitute the free end of the explosion-proof score 12. Each free end of the explosion-proof notch 12 is provided with a first extension notch 14, and one end of the first extension notch 14 is connected to the free end of the explosion-proof notch 12, and the other end extends to the position where the end of the corresponding guide notch 13 is located. The second extension notch 15 is provided at both ends of the guide notch 13, and one end of the second extension notch 15 is connected to the guide notch 13, and the other end extends to the position where the free end of the explosion-proof notch 12 is located. Moreover, the material thickness of the body 1 at the first extension notch 14 is usually less than the remaining material thickness at the guide notch 13, and greater than the remaining material thickness at the first extension notch 14 or the second extension notch 15.

[0059] In this way, by setting the first extension score 14 and / or the second extension score 15, it is ensured that after the explosion-proof membrane 2 is completely exploded along the explosion-proof score 12, the left and right valves of the explosion-proof membrane 2 can be further opened under the action of the first extension score 14 and / or the second extension score 15, so that the explosion-proof membrane 2 is fully exploded.

[0060] Optionally, combined Figure 2 and Fig.11As shown, the explosion-proof notch 12 also includes a fourth notch 124 and a fifth notch 125. The fourth notch 124 is located on a side of the second notch 122 away from the third notch 123, and is connected to an end of the second notch 122 away from the first notch 121. The fifth notch 125 is located on a side of the third notch 123 away from the second notch 122, and is connected to an end of the third notch 123 away from the first notch 121. The first notch 121 and the second notch 122, the first notch 121 and the third notch 123, the second notch 122 and the third notch 123, the fourth notch 124 and the second notch 122, and the fifth notch 125 and the third notch 123 are all arranged at an angle, and the length of the fourth notch 124 is less than the length of the second notch 122, and the length of the fifth notch 125 is less than the length at the third notch 123.

[0061] Specifically, each section of the explosion-proof notch 12 is a linear groove structure, and two adjacent sections of the notch are arranged at an angle. Among them, the fourth notch 124 is arranged at one end of the second notch 122 away from the first notch 121, and the fifth notch 125 is arranged at one end of the third notch 123 away from the first notch 121. Moreover, the first notch 121 can be used as a central notch, the second notch 122 and the third notch 123 can be used as main notches, and the fourth notch 124 and the fifth notch 125 can be used as auxiliary notches. The length of the main notch is usually less than the length of the central notch and greater than the length of the auxiliary notch, so that the structural strength of the body 1 at the main notch is greater than the structural strength of the body 1 at the central notch, and less than the structural strength of the body 1 at the auxiliary notch, so that the explosion-proof membrane 2 is exploded in the order of the central notch, the main notch, and the auxiliary notch. At this time, the area surrounded by the first notch 121, the second notch 122, the fourth notch 124 and the guide notch 13 on one side forms the first valve 21, and the area surrounded by the first notch 121, the third notch 123, the fifth notch 125 and the guide notch 13 on the other side forms the second valve 22.

[0062] In this embodiment, by respectively setting the fourth notch 124 and the fifth notch 125 at the end of the second notch 122 away from the first notch 121 and the end of the third notch 123 away from the first notch 121, and making the length of the fourth notch 124 smaller than the length of the second notch 122, and the length of the fifth notch 125 smaller than the length of the third notch 123, the structural strength of the main body 1 at the fourth notch 124 and the fifth notch 125 is respectively greater than the structural strength of the main body 1 at the second notch 122 and the third notch 123, thereby ensuring that the second notch 122 and the third notch 123 can be torn before the fourth notch 124 and the fifth notch 125. In this way, when the explosion-proof membrane 2 is impacted by the internal air pressure of the battery, the explosion-proof membrane 2 can first crack from the first notch 121. After the first notch 121 is completely cracked, if the explosion-proof membrane 2 is still under pressure, the first valve 21 can continue to crack along the second notch 122 and the fourth notch 124 in sequence, and the second valve 22 can continue to crack along the third notch 123 and the fifth notch 125 in sequence, so that the explosion-proof pressure of the explosion-proof membrane 2 is set in a step-by-step manner, ensuring that the explosion-proof notches 12 can crack according to the preset blasting sequence, thereby meeting the requirements of explosion-proof pressure stability.

[0063] Furthermore, combined with Fig.11 As shown, the fourth notch 124 and the fifth notch 125 are symmetrically arranged on both sides of the first notch 121. Such arrangement can simplify the processing technology of the explosion-proof notch 12 and improve production efficiency, and on the other hand, make the first valve 21 and the second valve 22 of the explosion-proof membrane 2 present a symmetrical structure, so that the left and right valves of the explosion-proof membrane 2 can be torn open simultaneously and synchronously, thereby quickly forming the exhaust hole 100 for exhaust and pressure relief.

[0064] Furthermore, combined with Fig. 9 and Fig.10 As shown, the cross section of the explosion-proof notch 12 perpendicular to its extension direction is in an inverted trapezoidal structure, a V-shaped structure or a U-shaped structure.

[0065] In this embodiment, the cross-sectional shape of the explosion-proof notch 12 can be selected and designed according to the shape of the explosion-proof notch 12. For example, when the explosion-proof notch 12 is composed of a straight notch and two V-shaped notches, the cross-sectional shape of the explosion-proof notch 12 is usually set to a V-shaped structure or a U-shaped structure. When the explosion-proof notch 12 is composed of a first notch 121, a second notch 122, a third notch 123, a fourth notch 124, and a fifth notch 125, and two adjacent notches are set at an angle, the cross-sectional shape of the explosion-proof notch 12 is usually set to an inverted trapezoidal structure. In this way, the cross-sectional shape of the explosion-proof notch 12 is set to an inverted trapezoidal structure, a V-shaped structure, or a U-shaped structure to simplify the structure and facilitate processing.

[0066] Furthermore, combined with Fig. 9As shown, when the cross section of the explosion-proof notch 12 is an inverted trapezoidal structure, the length k of the shorter bottom side of the inverted trapezoidal structure is between 0.1 mm and 0.35 mm.

[0067] If the length k of the shorter bottom side of the inverted trapezoidal structure is set too small, it is easy to make the processing of the notch groove difficult. If the length k of the shorter bottom side of the inverted trapezoidal structure is set too large, the concentrated stress at the bottom of the notch groove is small, resulting in the notch groove being difficult to tear open. Therefore, in this embodiment, k is set between 0.1 mm and 0.35 mm to ensure that the explosion-proof notch 12 is both easy to process and can be torn open smoothly.

[0068] Furthermore, combined with Fig. 9 As shown, when the cross section of the explosion-proof notch 12 is an inverted trapezoidal structure, the angle α between the two sides of the inverted trapezoidal structure is between 30° and 120°.

[0069] If the angle α is set too small, it is easy to make the processing of the notch groove difficult, and if the angle α is set too large, it is easy to make the width of the notch groove (i.e., the size of the explosion-proof notch 12 in the Y-axis direction) larger. Therefore, in this embodiment, the angle α is set between 30° and 120° to reduce the width of the explosion-proof notch 12 while ensuring that the explosion-proof notch 12 is easy to process.

[0070] Furthermore, combined with Fig.10 As shown, when the cross section of the explosion-proof notch 12 is V-shaped, the angle λ of the V-shaped structure is ≥ 60°. This arrangement can reduce the width of the explosion-proof notch 12 while ensuring that the explosion-proof notch 12 is easy to process.

[0071] Optionally, combined Figure 2 , Figure 3 , Figure 4 and Figure 6 As shown, a first reinforcing structure 23 is provided on the first valve 21, and a second reinforcing structure 24 is provided on the second valve 22. The first reinforcing structure 23 is formed by the first valve 21 protruding toward the inner side of the main body 1, or by the first valve 21 protruding toward the outer side of the main body 1, and the second reinforcing structure 24 is formed by the second valve 22 protruding toward the inner side of the main body 1, or by the second valve 22 protruding toward the outer side of the main body 1; wherein, the inner side of the main body 1 is the side where the inner surface of the main body 1 is located, and the outer side of the main body 1 is the side where the outer surface of the main body 1 is located.

[0072] Specifically, the inner side of the main body 1 is also the side of the main body 1 facing the internal space of the battery, and the outer side of the main body 1 is also the side of the main body 1 facing the external space of the battery. When the first reinforcement structure 23 is raised from the first valve 21 toward the inner side of the main body 1, a raised reinforcement boss structure is formed on the inner surface of the first valve 21, and a recessed reinforcement recessed platform structure is formed at a position corresponding to the first reinforcement structure 23 on the outer surface of the first valve 21. Conversely, when the first reinforcement structure 23 is raised from the first valve 21 toward the outer side of the main body 1, a raised reinforcement boss structure is formed on the outer surface of the first valve 21, and a recessed reinforcement recessed platform structure is formed at a position corresponding to the first reinforcement structure 23 on the inner surface of the first valve 21. In addition, the structure of the second reinforcement structure 24 is generally the same as the first reinforcement structure 23, and will not be repeated here. Moreover, the protruding directions of the first reinforcement structure 23 and the second reinforcement structure 24 may be the same or opposite. For example, in one example, as Figure 2 and Figure 6 As shown, the protruding directions of the first reinforcement structure 23 and the second reinforcement structure 24 are the same. In another example, the protruding directions of the first reinforcement structure 23 and the second reinforcement structure 24 are opposite.

[0073] In the present embodiment, by providing a first reinforcing structure 23 on the first valve 21 and a second reinforcing structure 24 on the second valve 22, not only can the structural strength of the explosion-proof membrane 2 be increased to avoid tearing of the explosion-proof notch 12 when the explosion-proof membrane 2 performs "diaphragm-like" breathing, but also when the explosion-proof membrane 2 explodes, it can ensure that the left and right valves rupture neatly without deformation, so that the explosion-proof membrane 2 can not only play a certain role in guiding the airflow, but also protect the surrounding battery cells or surrounding components.

[0074] Furthermore, combined with Figure 2 and Figure 6 As shown, the orthographic projections of the first reinforcement structure 23 and the second reinforcement structure 24 on the reference plane 11 of the body 1 are symmetrically arranged. The reference plane 11 of the body 1 is usually the outer surface of the body 1 on which the explosion-proof membrane 2 is arranged. In this way, the first reinforcement structure 23 and the second reinforcement structure 24 are symmetrically arranged to simplify the structure of the explosion-proof membrane 2 and facilitate processing and manufacturing.

[0075] Optionally, combined Figure 4 and Figure 6As shown, the first valve 21 is further provided with a first reinforcement groove 25, and the first reinforcement groove 25 separates the first reinforcement structure 23 into a first boss portion 231, a second boss portion 232 and a third boss portion 233. The first boss portion 231 is arranged along the edge of the second notch 122 located at one end of the first notch 121 and a portion of the edge of the first notch 121, the second boss portion 232 is arranged along the edge of the second notch 122 located at the other end of the first notch 121 and another portion of the edge of the first notch 121, and the third boss portion 233 is extended in a direction parallel to the first notch 121 and is located on the side of the first boss portion 231 and the second boss portion 232 away from the second reinforcement structure 24.

[0076] The first reinforcement groove 25 includes a first groove 251, a second groove 252 and a third groove 253. The gap between the first boss portion 231 and the third boss portion 233 constitutes the first groove 251, the gap between the second boss portion 232 and the third boss portion 233 constitutes the second groove 252, and the gap between the first boss portion 231 and the second boss portion 232 constitutes the third groove 253. The third groove 253 corresponds to the middle position of the first notch 121, and the first groove 251 and the second groove 252 intersect at the third groove 253.

[0077] Specifically, taking the example in which the first reinforcement structure 23 is formed by the first valve 21 protruding toward the inner side of the main body 1, at this time, a raised reinforcement boss structure is formed on the inner surface of the first valve 21, that is, the first boss portion 231, the second boss portion 232 and the third boss portion 233 are located on the inner surface of the first valve 21, and the first reinforcement groove 25 is also located on the inner surface of the first valve 21, so that the surface at the position corresponding to the first reinforcement groove 25 on the outer surface of the first valve 21 is higher than the surface at the position corresponding to the first reinforcement structure 23, which is equivalent to forming a reinforcement rib structure such as a bracket shape at the position corresponding to the first reinforcement groove 25 on the outer surface of the first valve 21.

[0078] In this embodiment, the first reinforcement groove 25 is provided on the first valve 21, and the first reinforcement structure 23 is divided into the first boss portion 231, the second boss portion 232 and the third boss portion 233 by the first reinforcement groove 25, so as to further improve the structural strength of the first valve 21. Moreover, by making the third groove 253 of the first reinforcement groove 25 correspond to the middle position of the first notch 121, and making the first groove 251 and the second groove 252 intersect at the third groove 253, a reinforcing rib structure such as a brace shape is formed at the position corresponding to the first reinforcement groove 25 on the first valve 21, and the third groove 253 corresponds to the vertex of the brace shape, so that the middle position of the first notch 121 can be reinforced by the structure of the reinforcing rib structure at the third groove 253, thereby improving the strength of the first notch 121 with a large span.

[0079] Furthermore, combined with Figure 6 As shown, the second valve 22 is also provided with a second reinforcement groove 26, and the orthographic projections of the first reinforcement groove 25 and the second reinforcement groove 26 on the reference plane 11 of the body 1 are symmetrically arranged. In this way, the second reinforcement structure on the second valve 22 is divided into a plurality of reinforcement areas by the second reinforcement groove 26, thereby further improving the structural strength of the second valve 22; and the first reinforcement groove 25 and the second reinforcement groove 26 are symmetrically arranged, on the one hand, so that the two bracket-shaped reinforcement rib structures are arranged back to back, and form an X-shaped structure at the center of the first notch 121, thereby further increasing the strength of the first notch 121 with a large span, and on the other hand, so that the first valve 21 and the second valve 22 of the explosion-proof membrane 2 are symmetrical structures, so as to facilitate the processing and manufacturing of the explosion-proof membrane 2.

[0080] Optionally, combined Figure 3 , Figure 4 and Figure 6 As shown, the first valve 21 is further provided with a third reinforcement groove 27, which is provided at the bottom of the first reinforcement groove 25 and extends along the extension direction of the first reinforcement groove 25. In this way, the third reinforcement groove 27 is used to improve the structural strength of the first reinforcement groove 25, thereby further improving the structural strength of the first valve 21.

[0081] Furthermore, combined with Figure 6 As shown, the second valve 22 is further provided with a fourth reinforcement groove 28, and the orthographic projections of the third reinforcement groove 27 and the fourth reinforcement groove 28 on the reference plane 11 of the body 1 are symmetrically arranged. In this way, the fourth reinforcement groove 28 is used to improve the structural strength of the second reinforcement groove 26, thereby further improving the structural strength of the second valve 22; and the third reinforcement groove 27 and the fourth reinforcement groove 28 are symmetrically arranged, so that the first valve 21 and the second valve 22 of the explosion-proof membrane 2 are symmetrical structures, so as to facilitate the processing and manufacturing of the explosion-proof membrane 2.

[0082] Optionally, combined Fig. 9 and Fig.11 As shown, the remaining material thickness t of the body 1 at the explosion-proof notch 12 is between 0.05 mm and 0.15 mm, and / or the ratio of the length a of the first notch 121 to the length b of the second notch 122 is between 12 and 13, and / or the ratio of the length a of the first notch 121 to the length d of the fourth notch 124 is between 29 and 30, and / or the angle β formed by the second notch 122 and the third notch 123 is between 80° and 160°, and / or the angle θ formed by the second notch 122 and the fourth notch 124 is between 60° and 140°, and / or the angle δ formed by the fourth notch 124 and the first extension notch 14 is between 100° and 180°.

[0083] In this optional embodiment, the explosion-proof notch 12 is composed of a first notch 121 , a second notch 122 , a third notch 123 , a fourth notch 124 and a fifth notch 125 .

[0084] If the remaining material thickness t of the main body 1 at the explosion-proof notch 12 is set too small, the structural strength of the connection between the explosion-proof membrane 2 and the main body 1 is relatively small, which makes the explosion-proof membrane 2 easily torn due to factors such as bumps or vibrations during transportation or vehicle driving, thereby causing the explosion-proof membrane 2 to fail; on the contrary, the structural strength of the connection between the explosion-proof membrane 2 and the main body 1 is relatively large, making the explosion-proof pressure of the explosion-proof membrane 2 relatively large, and making it difficult for the explosion-proof notch 12 to tear. Therefore, in this embodiment, t is set to be between 0.05mm and 0.15mm, so as to ensure that the connection between the explosion-proof membrane 2 and the main body 1 has a certain strength, while controlling the explosion-proof pressure of the explosion-proof membrane 2 within a suitable range, so as to facilitate the explosion and exhaust of the explosion-proof membrane 2.

[0085] If the ratio of the length a of the first notch 121 to the length b of the second notch 122, and the ratio of the length a of the first notch 121 to the length d of the fourth notch 124 are set too small, the second notch 122 and the fourth notch 124 will be smaller in length than the first notch 121, and the tearing range of the explosion-proof membrane 2 will be smaller, which may easily lead to a smaller exhaust hole 100 formed after the explosion-proof membrane 2 is cracked, which is not conducive to the rapid discharge of high-temperature gas inside the battery; conversely, it may easily lead to a larger overall size of the explosion-proof notch 12, occupying a larger area of ​​the main body 1, which is not conducive to layout. Therefore, in this embodiment, the ratio of the length a of the first notch 121 to the length b of the second notch 122 is set between 12 and 13, and / or the ratio of the length a of the first notch 121 to the length d of the fourth notch 124 is set between 29 and 30, so as to facilitate the arrangement of the explosion-proof membrane 2 on the main body 1. At the same time, it is ensured that the exhaust hole 100 formed after the explosion-proof membrane 2 is cracked has a sufficiently large opening area, so that the high-temperature gas inside the battery can be quickly discharged, thereby improving the explosion-proof effect.

[0086] If the angle β formed by the second notch 122 and the third notch 123, the angle θ formed by the second notch 122 and the fourth notch 124, or the angle δ formed by the fourth notch 124 and the first extended notch 14 is set too small, it will cause the left and right valve areas of the explosion-proof membrane 2 to be small, and then cause the exhaust hole 100 formed after the explosion-proof membrane 2 is cracked to be small; on the contrary, it is easy to cause the exhaust hole 100 formed after the explosion-proof membrane 2 is cracked to be large, occupying a large area of ​​the main body 1, which is not conducive to layout. Therefore, in this embodiment, the angle β is set between 80° and 160°, and / or the angle θ is set between 60° and 140°, and / or the angle δ is set between 100° and 180°, so as to facilitate the layout of the explosion-proof membrane 2 on the main body 1, and at the same time, ensure that the exhaust hole 100 formed after the explosion-proof membrane 2 is cracked has a sufficiently large opening area, so that the high-temperature gas inside the battery can be quickly discharged, thereby improving the explosion-proof effect.

[0087] Another embodiment of the present invention provides a battery, comprising the explosion-proof structure as described above.

[0088] The beneficial effects of the battery in this embodiment relative to the prior art are the same as those of the above-mentioned explosion-proof structure, and will not be described in detail here.

[0089] Another embodiment of the present invention provides an electrical device, including the explosion-proof structure as described above, or including the battery as described above.

[0090] In this embodiment, the electrical equipment can be in the field of transportation, such as electric vehicles, hybrid vehicles, electric engineering vehicles, electric ships, etc., or mobile communication equipment, etc., which are not specifically limited here. In addition, the beneficial effects of the electrical equipment in this embodiment relative to the prior art are the same as those of the above-mentioned explosion-proof structure, which will not be repeated here.

[0091] Although the utility model is disclosed as above, the protection scope of the utility model is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the utility model, and these changes and modifications will fall within the protection scope of the utility model.

Claims

1. An explosion-proof structure, characterized in that: It comprises a body (1), wherein an explosion-proof notch (12) is provided on the outer surface of the body (1), and an area surrounded by the explosion-proof notch (12) forms an explosion-proof membrane (2); The explosion-proof notch (12) comprises a first notch (121), a second notch (122) and a third notch (123); the second notch (122) and the third notch (123) are disposed at both ends of the first notch (121); the second notch (122) and the third notch (123) are respectively located on both sides of the first notch (121); the ends of the second notch (122) and the third notch (123) intersect with the end of the first notch (121); and the lengths of the second notch (122) and the third notch (123) are respectively smaller than the length of the first notch (121); The explosion-proof membrane (2) comprises a first valve (21) and a second valve (22); an area enclosed by the first notch (121) and the second notch (122) located at both ends of the first notch (121) forms the first valve (21); an area enclosed by the first notch (121) and the third notch (123) located at both ends of the first notch (121) forms the second valve (22).

2. The explosion-proof structure according to claim 1, characterized in that: The explosion-proof notch (12) further comprises a fourth notch (124) and a fifth notch (125), wherein the fourth notch (124) is located on a side of the second notch (122) away from the third notch (123) and connected to an end of the second notch (122) away from the first notch (121), and the fifth notch (125) is located on a side of the third notch (123) away from the second notch (122) and connected to an end of the third notch (123) away from the first notch (121). The first notch (121) and the second notch (122), the first notch (121) and the third notch (123), the second notch (122) and the third notch (123), the fourth notch (124) and the second notch (122), and the fifth notch (125) and the third notch (123) are all arranged at an angle, and the length of the fourth notch (124) is smaller than the length of the second notch (122), and the length of the fifth notch (125) is smaller than the length of the third notch (123).

3. The explosion-proof structure according to claim 2, characterized in that: The inner surface of the body (1) is provided with a guide notch (13), and the area enclosed by the guide notch (13) and the explosion-proof notch (12) together forms the explosion-proof membrane (2), and the guide notch (13) is arranged in parallel with the first notch (121), and one guide notch (13) is provided on each side of the first notch (121).

4. The explosion-proof structure according to claim 3, characterized in that: The outer surface of the body (1) is also provided with a first extension notch (14), and each free end of the explosion-proof notch (12) is respectively connected to the first extension notch (14), and the first extension notch (14) extends away from one end of the explosion-proof notch (12) to the position where the end of the corresponding guide notch (13) is located; And / or, the inner surface of the body (1) is further provided with a second extension notch (15), the two ends of the guide notch (13) are respectively connected to the second extension notch (15), and the second extension notch (15) extends away from one end of the guide notch (13) to the position where the free end of the corresponding explosion-proof notch (12) is located.

5. The explosion-proof structure according to claim 1, characterized in that: A first reinforcing structure (23) is provided on the first valve (21), and a second reinforcing structure (24) is provided on the second valve (22); the first reinforcing structure (23) is formed by the first valve (21) protruding toward the inner side of the body (1), or by the first valve (21) protruding toward the outer side of the body (1); the second reinforcing structure (24) is formed by the second valve (22) protruding toward the inner side of the body (1), or by the second valve (22) protruding toward the outer side of the body (1); wherein the inner side of the body (1) is the side where the inner surface of the body (1) is located, and the outer side of the body (1) is the side where the outer surface of the body (1) is located.

6. The explosion-proof structure according to claim 5, characterized in that: A first reinforcement groove (25) is also provided on the first valve membrane (21), and the first reinforcement groove (25) divides the first reinforcement structure (23) into a first boss portion (231), a second boss portion (232) and a third boss portion (233); the first boss portion (231) is arranged along the edge of the second notch (122) located at one end of the first notch (121) and a portion of the edge of the first notch (121); the second boss portion (232) is arranged along the edge of the second notch (122) located at the other end of the first notch (121) and another portion of the edge of the first notch (121); the third boss portion (233) is extended in a direction parallel to the first notch (121) and is located on a side of the first boss portion (231) and the second boss portion (232) that is away from the second reinforcement structure (24); The first reinforcement groove (25) comprises a first groove (251), a second groove (252) and a third groove (253); the gap between the first boss portion (231) and the third boss portion (233) constitutes the first groove (251); the gap between the second boss portion (232) and the third boss portion (233) constitutes the second groove (252); the gap between the first boss portion (231) and the second boss portion (232) constitutes the third groove (253); the third groove (253) corresponds to the middle position of the first notch (121), and the first groove (251) and the second groove (252) intersect at the third groove (253).

7. The explosion-proof structure according to claim 6, characterized in that: A third reinforcement groove (27) is also provided on the first valve membrane (21); the third reinforcement groove (27) is provided at the groove bottom of the first reinforcement groove (25) and is extended along the extension direction of the first reinforcement groove (25).

8. The explosion-proof structure according to claim 4, characterized in that: The ratio of the length a of the first notch (121) to the length b of the second notch (122) is between 12 and 13, and / or the ratio of the length a of the first notch (121) to the length d of the fourth notch (124) is between 29 and 30, and / or the angle β formed by the second notch (122) and the third notch (123) is between 80° and 160°, and / or the angle θ formed by the second notch (122) and the fourth notch (124) is between 60° and 140°, and / or the angle δ formed by the fourth notch (124) and the first extension notch (14) is between 100° and 180°, and / or the remaining material thickness t of the body (1) at the explosion-proof notch (12) is between 0.05 mm and 0.15 mm.

9. A battery, characterized in that: The invention comprises an explosion-proof structure as described in any one of claims 1 to 8.

10. An electrical device, characterized in that: The invention comprises an explosion-proof structure as claimed in any one of claims 1 to 8, or comprises a battery as claimed in claim 9.

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