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 anti-explosion valve for the battery comprises a valve body, a valve core and a valve core, the first breathable film is arranged in the exhaust channel and blocks the exhaust channel; the second breathable film is arranged in the exhaust channel and blocks the exhaust channel; the ejector pin is arranged in the exhaust channel and located between the first breathable film and the second breathable film, the tip end of the ejector pin faces the first breathable film, and the first breathable film makes contact with the tip end of the ejector pin and is punctured when deforming under the action of pressure. The problem that in the prior art, a battery pack breathable film is prone to being punctured by mistake is solved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery explosion-proof valve, a battery cover, and a battery. Background Art

[0002] In the daily use of battery packs, such as lithium-ion batteries, the atmospheric pressure between the battery pack and the outside world must be balanced. When an internal fault occurs in the battery pack and extreme thermal runaway occurs, the gases generated within the battery pack need to be quickly discharged. Ejector-type explosion-proof valves are commonly used in current low-pressure battery packs to achieve this function. However, to ensure the burst pressure, the ejector pin and the vent membrane must be designed to be close together. This design is prone to false triggering, causing the ejector pin to accidentally puncture the vent membrane, which in turn can lead to the risk of valve failure and affect the normal use of the battery pack. Utility Model Content

[0003] The main purpose of the present application is to provide a battery explosion-proof valve, a battery cover and a battery, so as to solve the problem in the prior art that the battery pack breathable membrane is easily punctured by mistake.

[0004] To achieve the above-mentioned objectives, according to one aspect of the present application, a battery explosion-proof valve is provided, comprising: a valve body having an exhaust channel for allowing gas to pass through; a first breathable membrane, the first breathable membrane being arranged in the exhaust channel and blocking the exhaust channel; a second breathable membrane, the second breathable membrane being arranged in the exhaust channel and blocking the exhaust channel; and a ejector pin, the ejector pin being arranged in the exhaust channel and located between the first breathable membrane and the second breathable membrane, the tip of the ejector pin facing the first breathable membrane, and the first breathable membrane being contacted with the tip of the ejector pin and punctured when deformed under pressure.

[0005] Furthermore, the size and / or density of the air pores of the first breathable membrane are different from the size and / or density of the air pores of the second breathable membrane.

[0006] Furthermore, the size and / or density of the air pores of the first breathable membrane are greater than the size and / or density of the air pores of the second breathable membrane.

[0007] Furthermore, the second breathable membrane is closer to the outlet end of the exhaust channel than the first breathable membrane.

[0008] Furthermore, the second breathable membrane is closer to the outlet end of the exhaust channel than the first breathable membrane, a first welding portion is formed between the first breathable membrane and the valve body, and a second welding portion is formed between the second breathable membrane and the valve body, and the size of the second welding portion is larger than that of the first welding portion.

[0009] Furthermore, the valve body includes a raised portion, which protrudes toward the inside of the exhaust passage. The raised portion forms a stepped surface, and at least one of the first breathable membrane, the second breathable membrane, and the ejector pin is connected to the stepped surface.

[0010] Furthermore, there are multiple raised portions, including a first raised portion and a second raised portion, the first raised portion is located at the inlet end of the exhaust channel, the second raised portion is closer to the outlet end of the exhaust channel than the first raised portion, the first breathable membrane is located on the end surface of the first raised portion away from the second raised portion, the ejector pin is located on the end surface of the first raised portion close to the second raised portion, and the second breathable membrane is located on the end surface of the second raised portion.

[0011] Furthermore, a first distance is formed between a side of the first protrusion away from the second protrusion and an end surface of the inlet end, and a thickness of the first breathable membrane is less than or equal to the first distance.

[0012] Furthermore, the second protrusion is located in a middle region in the length direction of the exhaust passage and forms a predetermined distance from the end surface of the outlet end.

[0013] Furthermore, the ejector pin includes a main body and a needle. The main body has a through hole that passes through both sides of the main body along the axial direction of the exhaust channel. The needle is located on the side of the main body facing the first breathable membrane and has a pointed end.

[0014] According to another aspect of the present application, a battery top cover is provided, comprising a top cover body and the above-mentioned battery explosion-proof valve, wherein the top cover body has a cavity, the cavity has an exhaust hole for exhausting gas, the battery explosion-proof valve is arranged at the exhaust hole, and the first breathable membrane of the battery explosion-proof valve is closer to the interior of the cavity than the second breathable membrane.

[0015] According to another aspect of the present application, a battery is provided, comprising a shell and the above-mentioned battery cover, the shell having a receiving cavity for receiving the battery cell, the battery cover being arranged on the shell and shielding the receiving cavity, and the cavity of the battery cover being connected to the receiving cavity.

[0016] The technical solution of the present application is applied, by arranging two layers of breathable membranes in the exhaust channel, namely a first breathable membrane and a second breathable membrane, wherein the first breathable membrane and the ejector pin are punctured in a matching manner, while the second breathable membrane can be punctured by air pressure. In this way, the two layers of breathable membranes ensure that even if the first breathable membrane is punctured by the ejector pin due to accidental touch, the presence of the second breathable membrane still blocks the exhaust channel, thereby keeping the explosion-proof valve closed. Only when the gas pressure in the battery exceeds a predetermined value, the gas will break through the second breathable membrane to open the exhaust channel and achieve the effect of gas discharge. Thus, the setting of the two layers of breathable membranes achieves more stable explosive exhaust, avoiding the problem of explosion-proof valve failure caused by unexpected situations. At the same time, due to the setting of the two layers of breathable membranes, the specific settings of the two layers of breathable membranes can adopt different settings, thereby expanding the selection of breathable membranes and the range of optional IP protection levels, reducing design difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings that constitute part of this application are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0018] Figure 1 A schematic structural diagram of a battery cover with a battery explosion-proof valve according to the present application is shown;

[0019] Figure 2 Shown Figure 1 A top view of

[0020] Figure 3 Shown Figure 1 The main cross-sectional view of

[0021] Figure 4 Shown Figure 1 Bottom sectional view;

[0022] Figure 5 Shown Figure 3 and Figure 4 Cross-sectional view of the explosion-proof valve of the middle battery;

[0023] Figure 6 Shown Figure 1 A schematic diagram of the structure of the battery cover at the second breathable membrane;

[0024] Figure 7 Shown Figure 1 A schematic structural diagram of the battery cover at the first breathable membrane;

[0025] Figure 8 Shown Figure 6 A schematic diagram of the structure when the second breathable membrane is hidden;

[0026] Figure 9 Shown Figure 8 Enlarged view of the middle ejector pin;

[0027] Figure 10 Shown Figure 7 Schematic diagram of the structure when the first breathable membrane is hidden.

[0028] The above drawings include the following reference numerals:

[0029] 10. Valve body; 11. Exhaust channel; 12. First protrusion; 13. Second protrusion; 20. First breathable membrane; 30. Second breathable membrane; 40. Ejector pin; 41. Main body; 411. Inner ring; 412. Connecting rib; 42. Needle; 50. Upper cover body; 51. Cavity. DETAILED DESCRIPTION

[0030] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0032] 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.

[0033] In order to solve the problem in the prior art that the breathable membrane of the battery pack is easily punctured by mistake, the present application provides a battery explosion-proof valve, a battery top cover and a battery.

[0034] like Figures 1 to 10 As shown, a battery explosion-proof valve includes a valve body 10, a first breathable membrane 20, a second breathable membrane 30, and a ejector pin 40. The valve body 10 has an exhaust channel 11 for gas to pass through; the first breathable membrane 20 is disposed in the exhaust channel 11 and blocks the exhaust channel 11; the second breathable membrane 30 is disposed in the exhaust channel 11 and blocks the exhaust channel 11; the ejector pin 40 is disposed in the exhaust channel 11 and is located between the first breathable membrane 20 and the second breathable membrane 30. The tip of the ejector pin 40 faces the first breathable membrane 20. When the first breathable membrane 20 is deformed under pressure, it contacts the tip of the ejector pin 40 and is punctured.

[0035] This embodiment provides two layers of breathable membranes within the exhaust passage 11, namely a first breathable membrane 20 and a second breathable membrane 30. The first breathable membrane 20 and the ejector pin 40 are punctured by a puncture mechanism, while the second breathable membrane 30 can be punctured by air pressure. Thus, even if the first breathable membrane 20 is punctured by the ejector pin 40 due to accidental contact, the second breathable membrane 30 still seals the exhaust passage 11, thereby keeping the explosion-proof valve closed. Only when the gas pressure within the battery exceeds a predetermined level will the gas break through the second breathable membrane 30, causing the exhaust passage 11 to open and discharge gas. This dual-layer arrangement achieves more stable explosive exhaust, avoiding the problem of explosion-proof valve failure caused by unexpected circumstances. Furthermore, the two-layer arrangement allows for different configurations of the two layers, thereby expanding the selection of breathable membranes and the range of selectable IP protection levels, reducing design complexity.

[0036] It should be noted that the specific number of breathable membranes is not limited to the first breathable membrane 20 and the second breathable membrane 30 of this embodiment. More breathable membranes such as a third breathable membrane and a fourth breathable membrane can be added as needed.

[0037] like Figures 5 to 7 As shown, this embodiment employs a configuration in which the second breathable membrane 30 is positioned closer to the outlet of the exhaust passage 11 than the first breathable membrane 20. This means that the first breathable membrane 20 is deformed by the gas within the cavity 51 before the second breathable membrane 30. This causes the first breathable membrane 20 to contact and be punctured by the ejector pin 40 before the gas acts on the second breathable membrane 30. When the gas pressure is sufficiently high, the gas breaks through the second breathable membrane 30, achieving pressure relief and exhaust. This configuration of this embodiment allows the two breathable membranes to better perform their respective functions, achieving stable exhaust.

[0038] In an embodiment not shown in the figure, the second breathable membrane 30 is closer to the inlet end of the exhaust channel 11 than the first breathable membrane 20. That is, the gas in the cavity 51 in this embodiment will first act on the second breathable membrane 30, and then act on the first breathable membrane 20 after breaking through the second breathable membrane 30, causing the first breathable membrane 20 to deform and thus come into contact with the ejector pin 40 and be punctured, thereby opening the exhaust channel 11.

[0039] Based on the aforementioned arrangement of the two breathable membranes, the specific parameters of the two breathable membranes, such as the selection and IP protection rating range, can be set to be different. This embodiment employs a method in which the size and / or density of the air pores of the first breathable membrane 20 and the second breathable membrane 30 are different. It should be noted that the size of the air pores referred to herein refers to the size of the openings, and the density refers to the density of the air pores when multiple air pores are provided. The arrangement of the air pores allows the air permeability, IP protection rating, and detonation pressure of the first breathable membrane 20 and the second breathable membrane 30 to be different, thereby achieving a wider range of air permeability selection and IP protection rating selection design. Of course, the first breathable membrane 20 and the second breathable membrane 30 can also be identical breathable membranes as needed, and their air permeability, protection rating, etc. can be identical.

[0040] Preferably, the size and / or density of the pores in the first breathable membrane 20 are greater than those in the second breathable membrane 30. This arrangement allows the battery explosion-proof valve of this embodiment to have a higher waterproof rating for the second breathable membrane 30 than for the first breathable membrane 20, while allowing less air permeability than for the first breathable membrane 20. This reduces the ingress of water molecules from the air into the battery, thereby reducing the risk of condensation and ensuring battery safety. The first breathable membrane 20 can be selected to have a lower IP rating than the required IP rating for the entire package, thereby simplifying design.

[0041] In this embodiment, both the first and second breathable membranes 20 and 30 are welded to the valve body 10. A first weld is formed between the first breathable membrane 20 and the valve body 10, while a second weld is formed between the second breathable membrane 30 and the valve body 10. Because the second breathable membrane 30 is located closer to the outlet, the second weld is larger than the first weld. This results in a higher weld strength than the first weld. This ensures a stronger connection between the second breathable membrane 30 and the valve body 10, making it easier to rupture the first breathable membrane 20 while less likely to rupture the second breathable membrane 30. The detonation pressure of the second breathable membrane 30 is higher than that of the first breathable membrane 20, thereby achieving more stable explosive exhaust. It should be noted that the size of the weld, as used herein, includes aspects such as the volume and mass of the weld formed by soldering, etc. The final strength of the second weld is greater than that of the first weld.

[0042] Of course, the specific size relationship between the first breathable membrane 20 and the second breathable membrane 30 in terms of air permeability, IP protection level, detonation pressure, etc. can also be adjusted according to actual needs and is not limited to the above-mentioned setting method of this embodiment.

[0043] In this embodiment, the valve body 10 includes a raised portion, which is located at the circumferential inner wall of the exhaust channel 11 and protrudes toward the inside of the exhaust channel 11 along the radial raised portion and extends circumferentially, thereby forming an annular protrusion inside the exhaust channel 11. The arrangement of the raised portion naturally forms a step surface between it and the inner wall surface of the exhaust channel 11, and the arrangement of the step surface provides a position for the installation of the breathable membrane and the ejector pin 40. Therefore, in this embodiment, the first breathable membrane 20, the second breathable membrane 30, and the ejector pin 40 are all installed on the step surface and connected to the step surface, thereby achieving the effect of stably installing the first breathable membrane 20, the second breathable membrane 30, and the ejector pin 40 in the exhaust channel 11.

[0044] like Figure 5 As shown, considering that a protrusion has two step surfaces formed on two axially opposite sides, in order to achieve the installation of three components, this embodiment provides multiple protrusions. More specifically, this embodiment provides two protrusions, and the two protrusions are axially spaced apart in the exhaust channel 11. The two protrusions are respectively a first protrusion 12 and a second protrusion 13, wherein the first protrusion 12 is located at the inlet end of the exhaust channel 11, and the second protrusion 13 is closer to the outlet end of the exhaust channel 11 than the first protrusion 12, so that along the axial direction of the exhaust channel 11 from the inlet end to the outlet end are the first protrusion 12 and the second protrusion 13, and there is an axial distance between the first protrusion 12 and the second protrusion 13. At the same time, based on the aforementioned positional relationship among the first breathable membrane 20, the second breathable membrane 30, and the ejector pin 40, in this embodiment, the first breathable membrane 20 is disposed on the end surface of the first protrusion 12 away from the second protrusion 13, the ejector pin 40 is disposed on the end surface of the first protrusion 12 close to the second protrusion 13, and the second breathable membrane 30 is disposed on the end surface of the second protrusion 13, so that the positional sequence of the first breathable membrane 20, the ejector pin 40, and the second breathable membrane 30 is formed along the axial direction of the exhaust passage 11.

[0045] Of course, the specific arrangement form and number of the above-mentioned raised portions can be adjusted as needed. For example, three raised portions can be provided, and the first breathable membrane 20, the second breathable membrane 30, and the ejector pin 40 are respectively installed on the step surfaces formed by the three raised portions, so that the first breathable membrane 20, the second breathable membrane 30, and the ejector pin 40 can be installed separately, while ensuring that the three can play their respective roles and the installation process does not affect each other.

[0046] like Figure 5 and Figure 7As shown, in this embodiment, a first distance is formed between the side of the first protrusion 12 away from the second protrusion 13 and the end surface of the inlet end, and the thickness of the first breathable membrane 20 is less than or equal to the first distance. In this embodiment, the value of the first distance is set to be relatively small, so that the first protrusion 12 is substantially located at the end surface of the inlet end and is substantially flush with the end surface of the inlet end, with a small distance between them. The first distance is also set to be substantially the same as the thickness of the first breathable membrane 20. Therefore, when the first breathable membrane 20 is mounted and attached to the end surface of the first protrusion 12 facing the inlet end, the surface of the first breathable membrane 20 facing the inside of the cavity 51 is substantially flush with the inner wall surface of the cavity 51. This ensures the effect of air pressure while reducing the impact on other flows within the cavity 51, avoiding pressure concentration and ensuring the service life of the battery.

[0047] Different from the first protrusion 12, the second protrusion 13 of this embodiment is not arranged at the end surface of the outlet, but is arranged at a certain distance from the end surface of the outlet. Figure 5 and Figure 6 Specifically, the second raised portion 13 is located in the middle of the length of the exhaust passage 11 and is spaced a predetermined distance from the end face of the outlet. This allows for a certain distance between the second raised portion 13 and the first raised portion 12, facilitating the installation of the ejector pin 40 and ensuring a certain distance between the ejector pin 40 and the second breathable membrane 30, thereby preventing the ejector pin 40 from affecting the second breathable membrane 30. Furthermore, after the second breathable membrane 30 is installed on the second raised portion 13, a certain distance between the second breathable membrane 30 and the outlet of the exhaust passage 11 is maintained. This prevents the second breathable membrane 30 from being affected by external components and factors other than air pressure, which could cause it to rupture unexpectedly, thereby ensuring that the second breathable membrane 30 can function stably and reliably. Of course, the specific positions of the first breathable membrane 20 and the second breathable membrane 30 can also be adjusted as needed and are not limited to the arrangement described above in this embodiment. For example, the second breathable membrane 30 can also be positioned at the end face of the outlet of the exhaust passage 11.

[0048] like Figure 5 As shown, the ejector pin 40 of this embodiment includes a main body 41 and a needle 42. Figures 8 to 10As shown, the main body 41 is a plate-like structure comprising an inner ring 411 and connecting ribs 412. The connecting ribs 412 are radially arranged, with their inner and outer ends connected to the inner ring 411 and the first protrusion 12, respectively. Multiple connecting ribs 412 are provided, spaced apart along the circumference of the main body 41, forming through-holes between the connecting ribs 412. The through-holes extend axially through both sides of the main body 41, connecting the through-holes with the exhaust passage 11. This allows gas to pass from the first breathable membrane 20 to the second breathable membrane 30 through the through-holes, ensuring effective gas discharge and preventing the ejector pin 40 from interfering with gas discharge. The needle 42 is located within the inner ring 411 of the main body 41, on the side facing the first breathable membrane 20. The needle 42 has a sharp tip, allowing the first breathable membrane 20 to contact the tip when deformed by gas, thereby being punctured by the needle 42 and achieving timely pressure relief and exhaust. Of course, the ejector pin 40 may adopt other structural forms besides the above-mentioned structure.

[0049] In this embodiment, the connecting rib 412 is embedded in the stepped surface of the first raised portion 12, that is, a slot is provided on the end surface of the first raised portion 12 facing the second raised portion 13, and the outer end of the connecting rib 412 is embedded in the slot, thereby achieving connection with the first raised portion 12. Of course, in addition to the above connection method, the main body 41 can also adopt other structural forms, such as adding an outer ring, which is mounted and fixed on the end surface of the first raised portion 12, and the outer end of the connecting rib 412 is connected to the outer ring, so that the main body 41 forms a two-layer annular structure.

[0050] like Figures 1 to 3 As shown, this embodiment also provides a battery top cover, including a top cover body 50 and the aforementioned battery explosion-proof valve. The top cover body 50 of this embodiment has a semi-enclosed structure, with a cavity 51 formed therein, which can cooperate with other parts of the battery to enclose the battery cells. A vent for exhaust is provided on the side of the cavity 51. The battery explosion-proof valve is located at the vent, and the exhaust channel 11 of the battery explosion-proof valve is connected to the vent, thereby achieving the effect of pressure relief and exhaust through the vent and the exhaust channel 11. Based on the aforementioned arrangement of the first breathable membrane 20 and the second breathable membrane 30, the battery top cover still adopts the arrangement of the first breathable membrane 20 of the battery explosion-proof valve closer to the interior of the cavity 51 than the second breathable membrane 30. This allows the first breathable membrane 20 to act as a shield. The first breathable membrane 20 cooperates with the ejector pin 40 to be punctured by the ejector pin 40 when the air pressure increases. The second breathable membrane 30 acts as a second shield, and is punctured by the gas when the air pressure in the cavity 51 increases, thereby releasing the pressure.

[0051] Optionally, the specific locations of the vent and battery explosion-proof valve on the upper cover body 50 can be adjusted as needed. Since the battery upper cover is generally located above the battery, the upper cover body 50 is designed with an opening at the bottom. Therefore, in this embodiment, the vent and battery explosion-proof valve are located on surfaces other than the bottom of the battery upper cover. They can be located on the circumferential side or the top surface, as long as they can communicate with the cavity 51 to achieve gas discharge.

[0052] Reinforcing ribs may be provided on the inner wall of the cavity 51 of the upper cover body 50 , and the reinforcing ribs may be connected to each other to form a polygonal structure, thereby facilitating improvement of the structural strength of the upper cover body 50 .

[0053] This embodiment also provides a battery comprising a housing and the aforementioned battery cover. The housing has a cavity for accommodating a battery cell. The upper portion of the housing is open, facilitating the installation and placement of components such as the battery cell within the cavity. The battery cover is positioned over the housing to shield the cavity and the components within it. When the battery cover is positioned over the housing, the cavity 51 of the battery cover communicates with the cavity, thereby forming a large cavity within the battery.

[0054] It should be noted that, in the above embodiments, a plurality refers to at least two.

[0055] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0056] 1. Solve the problem that the battery pack vent membrane in the prior art is easily punctured by mistake;

[0057] 2. The setting of two layers of breathable membrane achieves more stable explosion exhaust, avoiding the problem of explosion-proof valve failure caused by unexpected situations;

[0058] 3. The specific settings of the two layers of breathable membrane can be different, thereby expanding the selection of breathable membranes and the range of optional IP protection levels, and reducing design difficulty;

[0059] 4. The overall structure is simple, and the processing and installation are quick and convenient.

[0060] 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.

[0061] 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.

[0062] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0063] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery explosion-proof valve, characterized in that: include: A valve body (10), wherein the valve body (10) has an exhaust passage (11) for allowing gas to pass through; a first breathable membrane (20), the first breathable membrane (20) being arranged in the exhaust passage (11) and blocking the exhaust passage (11); a second breathable membrane (30), the second breathable membrane (30) being arranged in the exhaust passage (11) and blocking the exhaust passage (11); A ejector pin (40) is provided in the exhaust passage (11) and is located between the first breathable membrane (20) and the second breathable membrane (30). The tip of the ejector pin (40) faces the first breathable membrane (20). When the first breathable membrane (20) is deformed under pressure, it contacts the tip of the ejector pin (40) and is punctured.

2. The battery explosion-proof valve according to claim 1, characterized in that: The size and / or density of the air pores of the first air permeable membrane (20) are different from the size and / or density of the air pores of the second air permeable membrane (30).

3. The battery explosion-proof valve according to claim 2, characterized in that: The size and / or density of the air pores of the first air permeable membrane (20) are greater than the size and / or density of the air pores of the second air permeable membrane (30).

4. The battery explosion-proof valve according to claim 1, characterized in that: The second breathable membrane (30) is closer to the outlet end of the exhaust channel (11) than the first breathable membrane (20).

5. The battery explosion-proof valve according to claim 1, characterized in that: The second breathable membrane (30) is closer to the outlet end of the exhaust channel (11) than the first breathable membrane (20), a first welding portion is formed between the first breathable membrane (20) and the valve body (10), and a second welding portion is formed between the second breathable membrane (30) and the valve body (10), and the size of the second welding portion is larger than that of the first welding portion.

6. The battery explosion-proof valve according to any one of claims 1 to 5, characterized in that: The valve body (10) includes a raised portion, which protrudes into the interior of the exhaust channel (11). The raised portion forms a step surface, and at least one of the first breathable membrane (20), the second breathable membrane (30), and the ejector pin (40) is connected to the step surface.

7. The battery explosion-proof valve according to claim 6, characterized in that: The protrusions are multiple and include a first protrusion (12) and a second protrusion (13); the first protrusion (12) is located at the inlet end of the exhaust channel (11); the second protrusion (13) is closer to the outlet end of the exhaust channel (11) than the first protrusion (12); the first breathable membrane (20) is located on the end surface of the first protrusion (12) away from the second protrusion (13); the ejector pin (40) is located on the end surface of the first protrusion (12) close to the second protrusion (13); and the second breathable membrane (30) is located on the end surface of the second protrusion (13).

8. The battery explosion-proof valve according to claim 7, characterized in that: A first distance is formed between the side of the first protrusion (12) away from the second protrusion (13) and the end surface of the inlet end, and the thickness of the first breathable membrane (20) is less than or equal to the first distance.

9. The battery explosion-proof valve according to claim 7, characterized in that: The second protrusion (13) is located in the middle area of the exhaust passage (11) in the longitudinal direction, and forms a predetermined distance with the end surface of the outlet end.

10. The battery explosion-proof valve according to any one of claims 1 to 5, characterized in that: The ejector pin (40) comprises a main body (41) and a needle (42), wherein the main body (41) has a through hole, and the through hole penetrates both sides of the main body (41) along the axial direction of the exhaust channel (11), and the needle (42) is located on the side of the main body (41) facing the first breathable membrane (20), and the needle (42) has the tip.

11. A battery cover, characterized in that: The battery explosion-proof valve comprises an upper cover body (50) and a battery explosion-proof valve according to any one of claims 1 to 10, wherein the upper cover body (50) has a cavity (51), the cavity (51) has an exhaust hole for exhausting gas, the battery explosion-proof valve is arranged at the exhaust hole, and the first air permeable membrane (20) of the battery explosion-proof valve is closer to the interior of the cavity (51) than the second air permeable membrane (30).

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 (51) of the battery cover is connected to the receiving cavity.

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