Battery explosion-proof valve, battery upper cover and battery

Abstract

The utility model provides a battery anti-explosion valve, a battery upper cover and a battery, the battery anti-explosion valve comprises a valve body and a breathable film, and the valve body is provided with an exhaust channel for gas to pass through; the breathable film is arranged in the exhaust channel, a connecting part used for connecting the breathable film and the valve body is formed between the breathable film and the valve body, and the sizes of different positions of the connecting part are not completely the same, so that the connecting strengths of the different positions of the connecting part are not completely the same. The anti-explosion valve solves the problem that in the prior art, an anti-explosion valve is punctured and fails due to accidental touch.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery explosion-proof valve, a battery upper cover and a battery. BACKGROUND

[0002] As the core of new energy, batteries are used in large quantities. Low-voltage lithium-ion batteries (12V / 48V) are currently used as light hybrid or starting batteries along with the demand for new energy. Common single cells are ternary or iron lithium batteries. When the battery pack is in thermal runaway, a large amount of gas will be generated and needs to be discharged in time to avoid the risk of explosion of the battery pack. At the same time, the cell pack needs to balance the air pressure with the outside world in daily use. At present, the explosion-proof valve is mainly used to achieve this. For low-voltage battery systems, a split explosion-proof valve with a needle is mainly used. The needle type explosion-proof valve is deformed and pierced by the needle to achieve explosion and exhaust when the gas is sprayed under thermal runaway. In order to achieve a specific explosion pressure, the distance between the needle and the membrane also needs to be controlled, which requires high dimensional accuracy and complex process. In addition, it is also easy to cause the explosion-proof membrane to be pierced and fail under accidental contact or other extreme conditions. CONTENT OF THE UTILITY MODEL

[0003] The main purpose of the present application is to provide a battery explosion-proof valve, a battery upper cover and a battery to solve the problem of accidental contact leading to piercing failure of the explosion-proof valve in the prior art.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a battery explosion-proof valve is provided, comprising a valve body and a gas permeable membrane, the valve body having an exhaust passage for gas to pass through; the gas permeable membrane is arranged in the exhaust passage, and a connecting portion for connecting the gas permeable membrane and the valve body is formed between the gas permeable membrane and the valve body, the size of the connecting portion at different positions is not completely the same, so that the connection strength of the connecting portion at different positions is not completely the same.

[0005] Further, the connecting portion extends along the circumference of the exhaust passage and has a plurality of connecting segments, the connecting segments are connected by bending and form corners, the size of the corners is different from the size of the connecting segments, so that the connection strength at the corners is different from the connection strength at the connecting segments.

[0006] Further, the size of the corner is smaller than the size of the connecting segment, so that the connection strength at the corner is smaller than the connection strength at the connecting segment.

[0007] Further, the connecting segment includes at least one of a straight line and an arc.

[0008] Further, the connecting portion is in a polygonal structure, the straight line part of the polygonal structure is the connecting segment, and the bending part of the polygonal structure is the corner.

[0009] Further, the gas permeable membrane and the valve body are welded and form a welded structure, and the welded structure is the connecting portion.

[0010] Further, the size of the connecting part includes at least one of mass size, volume size, and density size.

[0011] Further, the exhaust passage has an inlet end and an outlet end along a flow direction of the exhaust passage, and the gas permeable membrane is located at the inlet end.

[0012] Further, the battery explosion-proof valve further comprises a cover body, the cover body covers the outlet end of the exhaust passage, the cover body has a gas hole penetrating through the inside and outside of the cover body, and the exhaust passage is in communication with the outside through the gas hole.

[0013] Further, one of the cover body and the valve body has a buckle, the other of the cover body and the valve body has a clamping hole, and the buckle is clamped in the clamping hole to achieve clamping connection of the cover body and the valve body.

[0014] According to another aspect of the present application, a battery upper cover is provided, comprising a cover body and the battery explosion-proof valve described above, the cover body has a cavity, the battery explosion-proof valve is connected with the cover body, and the exhaust passage of the battery explosion-proof valve is in communication with the cavity.

[0015] According to another aspect of the present application, a battery is provided, comprising a shell and the battery upper cover described above, the shell has a containing cavity for containing an electric core, the battery upper cover covers the shell and covers the containing cavity, and the cavity of the battery upper cover is in communication with the containing cavity.

[0016] By setting the connecting part between the gas permeable membrane and the valve body and setting the connecting strength between the gas permeable membrane and the valve body to be not completely the same at different positions, when the gas enters the exhaust passage and the gas pressure on the gas permeable membrane and the connecting part is large, the position with low connecting strength is easily broken, so that the bursting value of the position with the lowest connecting strength becomes the bursting value of the battery explosion-proof valve, and when the gas pressure is small, the gas permeation can be realized through the gas permeable membrane. This setting mode can set the bursting value of the battery explosion-proof valve by controlling the connecting strength of the connecting part at different positions, and can realize the functions of gas permeation and explosion-proof at the same time, avoids the problem of accidental puncture leading to puncture failure of the traditional needle explosion-proof valve, avoids the air tightness problem of the traditional split type explosion-proof valve, and has a simpler process and lower cost. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the specification explain the present application. The use of the same reference numerals in different drawings indicates similar or identical components.

[0018] Figure 1 FIG. 1 shows a structure schematic diagram of a battery upper cover according to an embodiment of the present application;

[0019] Figure 2 Fig. 1 shows a front view of the battery upper cover of embodiment one;

[0020] Figure 3 Fig. 2 shows a sectional view of A-A of the battery upper cover of embodiment one; Figure 2

[0021] Figure 4 Fig. 3 shows a structural schematic diagram of the battery upper cover of embodiment one without the cover body;

[0022] Figure 5 Fig. 4 shows a structural schematic diagram of the battery upper cover of embodiment one from another angle;

[0023] Figure 6 Fig. 5 shows an enlarged view of the connecting part of embodiment one;

[0024] Figure 7 Fig. 6 shows a structural schematic diagram of the cover body of embodiment one;

[0025] Figure 8 Fig. 7 shows a structural schematic diagram of the battery upper cover of embodiment two;

[0026] Figure 9 Fig. 8 shows a front view of the battery upper cover of embodiment two;

[0027] Figure 10 Fig. 9 shows a sectional view of B-B of embodiment two;

[0028] Figure 11 Fig. 10 shows a structural schematic diagram of the battery upper cover of embodiment two without the cover body.

[0029] Among the above drawings, the following reference signs are included:

[0030] 10, valve body; 11, buckle; 20, air permeable film; 30, connecting part; 31, connecting section; 32, corner; 40, cover body; 41, air hole; 42, buckle hole; 50, upper cover body. DETAILED DESCRIPTION

[0031] It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0032] It should be noted that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0033] ​In this application, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used with reference to the directions shown in the drawings, or with reference to the components themselves in the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit this application.

[0034] In order to solve the problem in the prior art that explosion-proof valves may fail due to puncture due to accidental contact, the present application provides a battery explosion-proof valve, a battery cover and a battery.

[0035] Example 1

[0036] like Figures 1 to 7 As shown, the battery explosion-proof valve includes a valve body 10 and a breathable membrane 20. The valve body 10 has an exhaust channel for allowing gas to pass through. The breathable membrane 20 is arranged in the exhaust channel. A connecting portion 30 for connecting the breathable membrane 20 and the valve body 10 is formed between the breathable membrane 20 and the valve body 10. The sizes of different positions of the connecting portion 30 are not completely the same, so that the connection strength of different positions of the connecting portion 30 is not completely the same.

[0037] In this embodiment, a connecting portion 30 is provided between the breathable membrane 20 and the valve body 10, and the connection strength between the breathable membrane 20 and the valve body 10 is not completely the same at different locations. In this way, when gas enters the exhaust channel and the gas pressure applied to the breathable membrane 20 and the connecting portion 30 is relatively high, the position with lower connection strength is easily broken, so that the bursting value of the position with the lowest connection strength becomes the bursting value of the battery explosion-proof valve. When the gas pressure is relatively low, ventilation can be achieved through the breathable membrane 20. This arrangement makes it possible to set the bursting value of the battery explosion-proof valve by controlling the connection strength at various locations of the connecting portion 30, and can simultaneously achieve the functions of ventilation and explosion-proof, thereby avoiding the problem of puncture failure caused by accidental contact in traditional ejector pin explosion-proof valves, and also avoiding the airtightness problem of traditional split explosion-proof valves. In addition, the process is simpler and the cost is reduced.

[0038] In this embodiment, if Figure 6 As shown, the connecting portion 30 extends along the circumference of the exhaust passage and has multiple connecting segments 31. The connecting segments 31 are connected by bends to form corners 32. The size of the corners 32 is different from that of the connecting segments 31, so that the connection strength at the corners 32 is different from the connection strength at the connecting segments 31, thereby providing a region of the connecting portion 30 that is easily ruptured by pressure. Specifically, there is no limit to the number of connecting segments 31 and corners 32. The number and shape of the connecting segments 31 and corners 32 can be flexibly set according to the size and shape of the actual exhaust passage. The connection strength can also be flexibly set according to the required burst value. The connecting segments 31 and corners 32 are sequentially connected to form a complete connecting portion 30.

[0039] In this embodiment, the size of the corner 32 is smaller than that of the connecting section 31, so that the connection strength at the corner 32 is lower than that at the connecting section 31. Thus, when gas passes through the exhaust passage, stress concentration at the corner 32 causes it to be subjected to greater stress than the connecting portion 30. Furthermore, the connection strength at the corner 32 is lower than that at the connecting section 31, making the corner 32 the weakest point in the connecting portion 30. The corner 32 then determines the burst pressure, and when the battery is depressurized, gas breaks through the corner 32 to achieve exhaust. Of course, the size of the corner 32 can also be set to be the same as that of the connecting portion 30, so that the connection strength at the corner 32 is the same as that of the connecting portion 30. However, when the battery is depressurized, the stress concentration at the corner 32 causes the corner 32 to be subjected to greater stress than the connecting portion 30, making the corner 32 still the most vulnerable point to bursting, allowing gas to break through the corner 32 to achieve exhaust.

[0040] In this embodiment, the connecting segment 31 includes at least one of a straight line and an arc. Figure 6 As shown, the connecting section 31 of this embodiment is configured as a straight line, and accordingly, the side edges of the breathable membrane 20 are also configured as straight lines, to facilitate the connection between the connecting portion 30 and the breathable membrane 20 and improve the connection efficiency. Of course, the connecting section 31 can also be configured as an arc, and accordingly, the side edges of the breathable membrane 20 are also configured as arcs to match the shape of the connecting portion 30. If necessary, the connecting portion 30 can also be configured as a circle, with only a circular connecting section 31 and no corners 32. It is sufficient to ensure that the connection strength of at least one location in the connecting section 31 is different from that of other locations to ensure that it can explode when the battery needs to be vented.

[0041] In this embodiment, the connecting portion 30 is a polygonal structure, the straight portion of the polygonal structure serves as the connecting section 31, and the bending portion of the polygonal structure serves as the corner 32. Figure 4 、 Figure 5 As shown, the cross section of the exhaust passage in this embodiment is square. Figure 3 As shown, the connecting portion 30 and the breathable membrane 20 are arranged inside the exhaust passage and are correspondingly arranged into a square structure. The four sides of the square structure arranged along the circumference of the exhaust passage are the connecting sections 31, and the right angles are the corners 32. In this way, the corners 32 naturally become the weakest points of the connecting strength of the connecting portion 30. The size of the connecting section 31 and the corners 32 can be adjusted to achieve its blasting function. The size of the square structure can be flexibly adjusted according to the air permeability requirements and the specific setting location, and can also be deformed into a rectangular structure. Of course, depending on the shape of the exhaust passage, the connecting portion 30 can also be set to other polygonal structures such as a triangular structure, a quadrilateral structure, etc., avoiding the size problem of traditional circular breathable valves or circular explosion-proof valves. The blasting principle of connecting portions 30 of other shapes is similar to that of the square structure and will not be repeated here.

[0042] In the embodiment, the air permeable membrane 20 is welded with the valve body 10, and a welded structure is formed as the connecting part 30. Specifically, there are various welding methods, and hot melting welding, ultrasonic welding, etc. can be selected. The embodiment is described by taking ultrasonic welding as an example. Main parameters of ultrasonic welding include ultrasonic frequency, amplitude, pressure and welding time, etc. The frequency is generally 30-50 HZ, the amplitude is 5-20 um, and the welding time is 1-3 s. Since it is a square air permeable valve structure, the stress of the corner area is greater than that of the surrounding area, and it is easier to burst. The welding controls the ultrasonic pressure and the welding temperature. For example, the corner 32 meets the 30-50 KPa burst pressure at P1 pressure and T1 temperature, the connecting section 31 meets the 35-55 KPa burst pressure at the welding pressure P1 and the T1 temperature, the ultrasonic pressure parameters are set as P1 and T1, the corner 32 can be realized to burst first, and the burst pressure can be reduced due to the inconsistent stress of the corner 32 and the connecting section 31. The P1 pressure range is 0.2-0.6 mPa, and the T1 temperature range is 160-260℃. In this way, by adjusting the welding parameters and cooperating with the inconsistent stress of different positions of the connecting part 30, the gas connecting part 30 realizes exhaust when the battery pack is pressure released. Of course, the connecting method between the valve body 10 and the air permeable membrane 20 can also use adhesion or set tooling and other methods to ensure that the connection strength of each part of the connecting part 30 is not completely consistent.

[0043] In the embodiment, the size of the connecting part 30 includes at least one of the mass size, the volume size and the density size, so that the connection strength of different positions of the connecting part 30 is inconsistent by the size inconsistency of different positions of the connecting part 30. Specifically, the size of the connecting part 30 can be the thickness size, that is, the volume size, and the connection strength inconsistency can be realized by the welding thickness inconsistency. For example, the welding thickness of the corner 32 can be appropriately smaller than the connection thickness of the connecting section 31, so that the corner 32 is more prone to burst. Of course, the size of the connecting part 30 can also be the mass size or the volume size, and the connection strength of each part of the welding part can be realized to be not completely consistent.

[0044] In the embodiment, along the flow direction of the exhaust passage, the exhaust passage has an inlet end and an outlet end, and the air permeable membrane 20 is located at the inlet end. In this way, the gas flows out from the battery, and the pressure at the inlet of the exhaust passage is closer to the pressure of the battery upper cover chamber, so that the burst can be more timely and effective. Specifically, as shown in FIG. 2, the exhaust passage 40 has an inlet end and an outlet end, and the air permeable membrane 20 is located at the inlet end. In this way, the gas flows out from the battery, and the pressure at the inlet of the exhaust passage is closer to the pressure of the battery upper cover chamber, so that the burst can be more timely and effective. Figure 1 、 Figure 2As shown, the valve body 10 is connected with the upper cover body 50 of the battery upper cover, and is fixed on the side wall of the upper cover body 50. The inlet end of the exhaust passage is close to one end of the cavity of the upper cover body 50, and the outlet end is the end of the gas discharge, that is, the end away from the cavity of the upper cover body 50. The gas permeable membrane 20 of the embodiment is arranged in a position flush with the inner wall of the battery upper cover, that is, arranged at the position where the cavity of the upper cover body 50 is connected with the exhaust passage, so that the pressure received by the connecting portion 30 is closer to the pressure in the cavity of the upper cover body 50, thereby improving the explosion-proof effect. The connecting portion 30 can be arranged on the side of the gas permeable membrane 20 close to the cavity of the upper cover body 50, or on the side of the gas permeable membrane 20 away from the cavity of the upper cover body 50, or on both sides. It can be selected according to actual needs. Of course, the gas permeable membrane 20 can also be arranged between the inlet end and the outlet end of the exhaust passage, or arranged at the outlet end, and the appropriate burst pressure can be set according to the distance between the gas permeable membrane 20 and the upper cover body 50 and the size of the flow cross section of the exhaust passage.

[0045] In the embodiment, the battery explosion-proof valve further comprises a cover body 40, which covers the outlet end of the exhaust passage. The cover body 40 has a gas hole 41 penetrating through the inner and outer sides of the cover body 40, and the exhaust passage is connected with the outside through the gas hole 41. Specifically, the cover body 40 is matched with the shape of the valve body 10 and is also arranged as a square structure, but the size of the cover body 40 should be larger than that of the valve body 10, and the cover body 40 is arranged as a hollow structure, so that the cover body 40 can be sleeved on the valve body 10, thereby covering the outlet end of the exhaust passage. When the battery is placed in an area in contact with the external environment, the cover body 40 can play a protective role to avoid the influence of the harsh use environment on the gas permeable membrane 20. According to the actual use environment of the battery, the cover body 40 can also be selected not to be arranged. The gas hole 41 can be arranged on the side of the cover body 40 and penetrate through the side wall of the cover body 40, or arranged on the end of the cover body 40 away from the valve body 10, that is, the top of the cover body 40 and penetrate through the top of the cover body 40, so that the gas discharged from the exhaust passage can be discharged to the outside in time through the gas hole 41, and the directional discharge of the gas can be realized by arranging the gas hole 41 at different positions. Figure 7 As shown, the gas hole 41 of the embodiment is arranged on the opposite sides of the cover body 40, and two gas holes 41 are arranged on each side. The gas hole 41 is arranged as a rectangular hole. Of course, the gas hole 41 can also be selected as an elliptical, circular or other shaped hole, which can meet the requirements of gas discharge.

[0046] In the embodiment, one of the cover body 40 and the valve body 10 has a buckle 11, and the other of the cover body 40 and the valve body 10 has a clamping hole 42. The buckle 11 is clamped in the clamping hole 42 to connect the cover body 40 and the valve body 10, so that the connection between the cover body 40 and the valve body 10 is more reliable. Figure 1As shown, the buckle 11 of the embodiment is arranged on the opposite two side walls of the valve body 10, the buckle 11 protrudes from the side wall of the valve body 10, and the end of the buckle 11 away from the upper cover body 50 is a slope, which plays a guiding role to facilitate the buckle 11 to enter the clamping hole 42 along the slope, and the end of the buckle 11 close to the upper cover body 50 is a plane parallel to the breathable film 20, thereby playing a fixing role to avoid the buckle 11 from being pulled out of the clamping hole 42. The clamping hole 42 is arranged on the outer side of the cover body 40 in a square shape, and is arranged on the opposite two sides of the cover body 40, penetrating through the side wall of the cover body 40 to match the buckle 11, thereby realizing the fixation of the cover body 40 and the valve body 10, and avoiding the leakage of the exhaust passage except the outlet end due to the clamping hole 42 arranged on the valve body 10. The clamping hole 42 and the air hole 41 can be arranged on the same side of the cover body 40, or can be arranged on different sides of the cover body 40, or the clamping hole 42 can be arranged on all four sides of the cover body 40, and the buckle 11 can be arranged on all four sides of the valve body 10 to match the clamping hole 42. Of course, the clamping hole 42 can also be arranged on the outer side wall of the valve body 10, and the buckle 11 can be arranged on the inner wall of the cover body 40, and the clamping hole 42 does not need to penetrate through the side wall of the valve body 10.

[0047] The application also provides a battery upper cover, which comprises an upper cover body 50 and the battery explosion-proof valve described above, the upper cover body 50 has a cavity, the battery explosion-proof valve is connected with the upper cover body 50, and the exhaust passage of the battery explosion-proof valve is in communication with the cavity. Specifically, as shown in the drawings, Figure 1 、 Figure 2 As shown, the valve body 10 of the embodiment is arranged on the side wall of the battery upper cover, the inlet end of the exhaust passage of the battery explosion-proof valve is closer to the cavity of the upper cover body 50 than the outlet end, so that the gas can enter the exhaust passage by explosion through the connecting part 30 from the cavity, and be discharged from the outlet end. The battery explosion-proof valve and the upper cover body 50 are integrally arranged, and can be integrally injection molded, so that the battery upper cover simultaneously realizes the functions of gas permeability and explosion-proof,

[0048] The application also provides a battery, which comprises a shell and the battery upper cover described above, the shell has a containing cavity for containing an electric core, the battery upper cover is arranged on the shell and covers the containing cavity, and the cavity of the battery upper cover is in communication with the containing cavity, so that the gas passes through the breathable film 20 from the containing cavity to the cavity of the upper cover body 50, enters the exhaust passage, and is discharged from the outlet end of the exhaust passage, and the connecting part 30 is exploded when the gas pressure reaches the set pressure, thereby realizing the functions of gas permeability and explosion of the battery explosion-proof valve.

[0049] Embodiment two

[0050] The difference between this embodiment and the first embodiment lies in the location of the battery explosion-proof valve. In the first embodiment, the battery explosion-proof valve is located on the side wall of the upper cover body 50, while in this embodiment, the battery explosion-proof valve is located on the top of the upper cover body 50, that is, on the side of the upper cover body 50 away from the housing. This is to accommodate different exhaust paths and size restrictions of the battery, thereby improving the flexibility of the battery explosion-proof valve location.

[0051] like Figures 8 to 11 As shown, the battery explosion-proof valve of this embodiment is installed at the top of the upper cover body 50, that is, on the side of the upper cover body 50 away from the housing. The valve body 10 is connected to the upper cover body 50. The provision of the battery explosion-proof valve enables the battery to have both ventilation and explosion-proof functions. The ventilation and explosion-proofing process is similar to that of the first embodiment. Gas flows from the battery's accommodating cavity into the chamber of the upper cover body 50, passes through the breathable membrane 20 and flows to the outside. When the pressure in the chamber reaches the set pressure, the connection part 30 explodes to relieve the pressure.

[0052] It should be noted that, in the above embodiments, a plurality refers to at least two.

[0053] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0054] 1. Solve the problem of puncture failure caused by accidental contact in the explosion-proof valve in the existing technology;

[0055] 2. It can achieve the functions of ventilation and explosion-proof at the same time, avoiding the problem of puncture failure caused by accidental contact of traditional ejector explosion-proof valves, and also avoiding the airtightness problem of traditional split explosion-proof valves;

[0056] 3. The process is simpler and the cost is reduced.

[0057] Obviously, the embodiments described above are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0058] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0059] It should be noted that the terms "first", "second", and the like, used in the description and in the claims of the present application as well as above-mentioned figures are used to distinguish between similar objects and not necessarily for describing a specific sequential or chronological order. It is to be understood that the use of data so designated is not meant to limit a given item to the specific example for which it is used, but rather the scope of the embodiments of the present application encompasses all possible examples that can be drawn to a given item.

[0060] The preferred embodiments of the present application as described above are illustrative only and not restrictive. Changes and modifications can be made by those having ordinary skill in the art without departing from the spirit of the present application. The scope of the application is not to be interpreted in the limited sense described above but should be interpreted in the spirit and scope of the appended claims.

Claims

1. A battery explosion-proof valve, characterized in that: include: A valve body (10), wherein the valve body (10) has an exhaust passage for allowing gas to pass through; A breathable membrane (20) is provided in the exhaust passage, and a connecting portion (30) for connecting the breathable membrane (20) and the valve body (10) is formed between the breathable membrane (20) and the valve body (10), and the sizes of the connecting portion (30) at different positions are not completely the same, so that the connection strengths of the connecting portion (30) at different positions are not completely the same.

2. The battery explosion-proof valve according to claim 1, characterized in that: The connecting portion (30) extends along the circumference of the exhaust passage and has a plurality of connecting segments (31). The connecting segments (31) are bent and connected to form corners (32). The size of the corners (32) is different from that of the connecting segments (31), so that the connection strength at the corners (32) is different from the connection strength at the connecting segments (31).

3. The battery explosion-proof valve according to claim 2, characterized in that: The size of the corner (32) is smaller than the size of the connecting section (31), so that the connection strength at the corner (32) is smaller than the connection strength at the connecting section (31).

4. The battery explosion-proof valve according to claim 2, characterized in that: The connecting segment (31) includes at least one of a straight line and an arc.

5. The battery explosion-proof valve according to claim 2, characterized in that: The connecting portion (30) is a polygonal structure, the straight portion of the polygonal structure serves as the connecting segment (31), and the bending portion of the polygonal structure serves as the corner (32).

6. The battery explosion-proof valve according to claim 1, characterized in that: The air permeable membrane (20) and the valve body (10) are welded to form a welding structure, and the welding structure serves as the connecting portion (30).

7. The battery explosion-proof valve according to claim 1, characterized in that: The size of the connecting portion (30) includes at least one of mass, volume, and density.

8. The battery explosion-proof valve according to any one of claims 1 to 7, characterized in that: Along the flow direction of the exhaust channel, the exhaust channel has an inlet end and an outlet end, and the air permeable membrane (20) is located at the inlet end.

9. The battery explosion-proof valve according to any one of claims 1 to 7, characterized in that: The battery explosion-proof valve further includes a cover body (40), the cover body (40) is provided to cover the outlet end of the exhaust channel, the cover body (40) has an air hole (41), the air hole (41) runs through the inner and outer sides of the cover body (40), and the exhaust channel is connected to the outside through the air hole (41).

10. The battery explosion-proof valve according to claim 9, characterized in that: One of the cover body (40) and the valve body (10) has a snap fastener (11), and the other of the cover body (40) and the valve body (10) has a snap hole (42), and the snap fastener (11) is snapped into the snap hole (42) to enable the cover body (40) and the valve body (10) to be snap-connected.

11. A battery cover, characterized in that: The battery explosion-proof valve comprises an upper cover body (50) and the battery explosion-proof valve according to any one of claims 1 to 10, wherein the upper cover body (50) has a cavity, the battery explosion-proof valve is connected to the upper cover body (50), and the exhaust channel of the battery explosion-proof valve is connected to the cavity.

12. A battery, characterized in that: The battery comprises a shell and the battery cover as claimed in claim 11, wherein the shell has a receiving cavity for receiving a battery cell, the battery cover is arranged on the shell and shields the receiving cavity, and the cavity of the battery cover is connected to the receiving cavity.

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