Explosion-proof valve assembly and battery

Abstract

The embodiment of the utility model discloses an anti-explosion valve assembly and a battery. The anti-explosion valve assembly comprises an anti-explosion valve body and a waterproof breathable film, the anti-explosion valve body is arranged on the side, close to the battery, of the opening of the battery cover plate so as to seal the opening, and the waterproof breathable film is arranged on the side, away from the opening, of the anti-explosion valve body so as to cover the anti-explosion valve body. And the waterproof gas-permeable membrane is used for blocking the circulation of non-gas substances in the battery, so that the splashing of the non-gas substances such as electrolyte at the moment of opening the valve is avoided, and the safety and the reliability of the battery are greatly improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to an explosion-proof valve assembly and a battery. Background Technology

[0002] The explosion-proof valve of a battery is a key safety device used to prevent the battery from exploding due to overpressure or overheating during charging, discharging, or abnormal operating conditions. Its main function is to automatically open the valve and release the high-pressure gas inside the battery when the internal pressure or temperature exceeds a set value, thereby achieving the purpose of explosion prevention.

[0003] In related technologies, during the opening process of the battery's explosion-proof valve, the excessive internal pressure of the battery can easily cause the electrolyte inside the battery to splash, thereby leading to a safety accident. Utility Model Content

[0004] To address the shortcomings of existing technologies, this application provides an explosion-proof valve assembly and a battery. During the process of opening the explosion-proof valve to release pressure, a waterproof and breathable membrane is used to block the flow of non-gaseous substances inside the battery, thus preventing electrolyte splashing at the moment of valve opening and avoiding safety accidents such as battery fires, and greatly improving the safety and reliability of the battery.

[0005] To address the aforementioned problems, in a first aspect, this application provides an explosion-proof valve assembly, comprising:

[0006] The explosion-proof valve body is located on the side of the battery cover opening near the battery to close the opening;

[0007] A waterproof and breathable membrane is placed on the side of the explosion-proof valve body away from the opening to cover the explosion-proof valve body.

[0008] Furthermore, in the explosion-proof valve assembly provided in this application, a first abutment portion is provided on the side of the opening near the battery, and the first abutment portion is recessed towards the side of the opening away from the battery, and the explosion-proof valve body is fixed at the first abutment portion; or / and,

[0009] A second abutment is provided on the side of the opening closest to the battery. The second abutment is recessed toward the side of the opening away from the battery, and a waterproof and breathable membrane is fixed to the second abutment.

[0010] Furthermore, in the explosion-proof valve assembly provided in this application, the second abutment portion is located on the side of the first abutment portion away from the opening.

[0011] Furthermore, in the explosion-proof valve assembly provided in this application, the distance between the first abutting part and the side of the battery cover away from the battery is smaller than the distance between the second abutting part and the side of the battery cover away from the battery.

[0012] Furthermore, in the explosion-proof valve assembly provided in this application, the explosion-proof valve assembly also includes a first fixing member;

[0013] The first fixing member is located on the side of the waterproof and breathable membrane near the battery, and the first fixing member is configured to fix the waterproof and breathable membrane; or / and,

[0014] The explosion-proof valve assembly also includes a second fixing component;

[0015] The second fastener is located on the side of the waterproof and breathable membrane away from the battery, and is configured to fix the waterproof and breathable membrane.

[0016] Furthermore, in the explosion-proof valve assembly provided in this application, the first fixing member and / or the second fixing member is an aluminum ring.

[0017] Furthermore, in the explosion-proof valve assembly provided in this application, the explosion-proof valve assembly also includes a protective film;

[0018] The protective film is located on the side of the battery cover away from the battery and seals the opening.

[0019] Furthermore, in the explosion-proof valve assembly provided in this application, the explosion-proof valve body is an explosion-proof aluminum sheet, and a protrusion is provided on the side of the explosion-proof aluminum sheet away from the battery, and the protrusion is located inside the opening.

[0020] Furthermore, in the explosion-proof valve assembly provided in this application, the opening is a circular opening; or / and,

[0021] The waterproof and breathable membrane is made of polytetrafluoroethylene (PTFE), or / and PTFE derivatives, or / and polyvinyl chloride (PVC), or / and fiberglass.

[0022] Secondly, this application also provides a battery comprising:

[0023] Battery cell;

[0024] The battery cover is configured to encapsulate the battery cells;

[0025] The battery cover has an opening, and the opening is equipped with an explosion-proof valve assembly provided by the second party.

[0026] The explosion-proof valve assembly provided in this application includes an explosion-proof valve body and a waterproof and breathable membrane. The explosion-proof valve body is located on the side of the battery cover plate near the battery opening to close the opening. The waterproof and breathable membrane is located on the side of the explosion-proof valve body away from the opening to cover the explosion-proof valve body. Thus, during the process of opening the explosion-proof valve to release pressure, the waterproof and breathable membrane can block the flow of non-gaseous substances inside the battery, avoiding the splashing of non-gaseous substances such as electrolyte at the moment of valve opening, which greatly improves the safety and reliability of the battery. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of the explosion-proof valve assembly on the battery cover provided in the embodiments of this application;

[0029] Figure 2 This is a schematic diagram of the structure of the battery cover provided in an embodiment of this application;

[0030] Figure 3 A partial structural diagram of the explosion-proof valve assembly on the battery cover provided in an embodiment of this application;

[0031] Figure 4 This is a schematic diagram of the overall structure of the waterproof and breathable membrane provided in the embodiments of this application;

[0032] Figure 5 A top view of the protective film provided in the embodiments of this application;

[0033] Figure 6 A transparent top view of the protective film provided in the embodiments of this application;

[0034] Figure 7 This is a schematic diagram of the structure of the waterproof and breathable membrane fixed to the first fixing member according to an embodiment of this application;

[0035] Figure 8 This is a schematic diagram of the structure of the waterproof and breathable membrane fixed to the second fastener according to an embodiment of this application.

[0036] Figure label:

[0037] 100 is the explosion-proof valve assembly, 110 is the explosion-proof valve body, 111 is the protrusion, 120 is the waterproof and breathable membrane, 130 is the first fixing part, 140 is the second fixing part, 150 is the protective film, 200 is the battery cover, 210 is the opening, 220 is the first abutting part, and 230 is the second abutting part. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0039] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0040] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0041] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0042] Furthermore, in this application, unless otherwise explicitly specified or limited in the embodiments, the terms "installation," "connection," "joining," and "fixing" appearing in the embodiments should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral part; it can also be a mechanical connection, an electrical connection, etc. Of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication between two components, or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific implementation.

[0043] In related technologies, the explosion-proof valve of a secondary battery can be composed of an explosion-proof aluminum sheet (the explosion-proof valve body) and an upper protective sheet. The protective sheet can prevent the explosion-proof valve from being corroded. When the battery malfunctions, such as thermal runaway, the internal pressure of the battery will increase to a certain value to open the explosion-proof valve and release pressure, thereby reducing the risk of battery explosion.

[0044] However, in the aforementioned technical solution, the explosion-proof valve is located on the battery cover, and the side of the explosion-proof aluminum sheet closest to the battery interior is relatively close to the electrolyte. When the battery experiences thermal runaway, the electrolyte may splash and overflow at the valve opening during the pressure relief process, easily causing a fire. Simultaneously, excessive pressure within the battery casing may also induce the ejection of solid materials from inside the battery, leading to a safety accident.

[0045] Therefore, this application provides an explosion-proof valve assembly and a battery. The explosion-proof valve assembly includes an explosion-proof valve body and a waterproof and breathable membrane. The explosion-proof valve body is located on the side of the battery cover plate near the battery opening to close the opening. The waterproof and breathable membrane is located on the side of the explosion-proof valve body away from the opening to cover the explosion-proof valve body. Thus, during the process of opening the explosion-proof valve to release pressure, the waterproof and breathable membrane blocks the flow of non-gaseous substances inside the battery, avoiding electrolyte splashing at the moment of valve opening and preventing battery fires and other safety accidents, greatly improving the safety and reliability of the battery.

[0046] Please see Figure 1 , Figure 2 and Figure 3 , Figure 1 This is a schematic diagram of the structure of the explosion-proof valve assembly 100 provided in the embodiment of this application on the battery cover 200; Figure 2 This is a schematic diagram of the structure of the battery cover 200 provided in an embodiment of this application; Figure 3 This is a partial structural diagram of the explosion-proof valve assembly 100 provided in the embodiments of this application on the battery cover plate 200.

[0047] like Figure 1 , Figure 2 and Figure 3 As shown, this application provides an explosion-proof valve assembly 100, which includes:

[0048] The explosion-proof valve body 110 is located on the side of the opening 210 of the battery cover 200 near the battery to close the opening 210.

[0049] A waterproof and breathable membrane 120 is disposed on the side of the explosion-proof valve body 110 away from the opening 210 to cover the explosion-proof valve body 110.

[0050] In this embodiment, the opening 210 of the battery cover 200 can be a circular opening 210. The explosion-proof valve body 110 is located on the side of the opening 210 of the battery cover 200 near the inside of the battery, and the explosion-proof valve body 110 can close the circular opening 210. A waterproof and breathable membrane 120 is located on the side of the explosion-proof valve body 110 near the inside of the battery and covers the explosion-proof valve body 110. The waterproof and breathable membrane 120 can also be a circular waterproof and breathable membrane 120.

[0051] Specifically, when the battery experiences thermal runaway, because the waterproof and breathable membrane 120 allows gas to pass through while blocking non-gas, the pressure on both sides of the membrane 120 is equal. This results in an imbalance of pressure inside and outside the explosion-proof valve body 110, with higher internal pressure. When the internal pressure reaches a certain value, the explosion-proof valve body 110 is pushed out through the opening 210 of the battery cover 200. At this point, non-gas substances inside the battery, such as electrolyte, cannot splash out through the opening 210 due to the obstruction of the waterproof and breathable membrane 120, thus preventing safety accidents caused by the splashing and overflow of non-gas substances inside the battery. This greatly improves the safety and reliability of the battery.

[0052] It should be noted that the opening 210 of the battery cover 200 mentioned in this application can also be a rectangular opening 210 or an opening 210 of other shapes. Consequently, the shapes of the corresponding explosion-proof valve body 110 and waterproof and breathable membrane 120 can be selected according to the shape of the opening 210 of the battery cover 200. This application does not impose any specific limitations.

[0053] The explosion-proof valve assembly 100 provided in this application includes an explosion-proof valve body 110 and a waterproof and breathable membrane 120. The explosion-proof valve body 110 is located on the side of the opening 210 of the battery cover plate 200 near the battery to close the opening 210. The waterproof and breathable membrane 120 is located on the side of the explosion-proof valve body 110 away from the opening 210 to cover the explosion-proof valve body 110. Thus, during the process of opening the explosion-proof valve to release pressure, the waterproof and breathable membrane 120 can block the flow of non-gaseous substances inside the battery, avoiding the splashing of non-gaseous substances such as electrolyte at the moment of valve opening, which greatly improves the safety and reliability of the battery.

[0054] In some embodiments, such as Figure 1 , Figure 2 and Figure 3 As shown, the opening 210 has a first abutment 220 on the side near the battery, the first abutment 220 is recessed toward the side of the opening 210 away from the battery, and the explosion-proof valve body 110 is fixed at the first abutment 220; the opening 210 has a second abutment 230 on the side near the battery, the second abutment 230 is recessed toward the side of the opening 210 away from the battery, and the waterproof and breathable membrane 120 is fixed at the second abutment 230.

[0055] In this embodiment, the first abutment portion 220 and the second abutment portion 230 are both located on the side of the opening 210 of the battery cover 200 near the battery, and are arranged around the opening 210. The explosion-proof valve body 110 can be installed at the first abutment portion 220 to close the opening 210 of the battery cover 200. The waterproof and breathable membrane 120 can be installed at the second abutment portion 230 to shield the explosion-proof valve body 110, thereby preventing the electrolyte inside the battery from splashing out of the opening 210 after the explosion-proof valve body 110 is opened.

[0056] The size of the area of ​​the shape formed by the first abutment portion 220 surrounding the opening 210 and the area of ​​the shape formed by the second abutment portion 230 surrounding the opening 210 can be set according to the actual application. It is sufficient that the explosion-proof valve body 110 can close the opening 210 and that the waterproof and breathable membrane 120 can prevent non-gaseous substances such as electrolyte from splashing from the opening 210 after the explosion-proof valve is opened.

[0057] In some embodiments, such as Figure 1 , Figure 2 and Figure 3 As shown, the second abutting portion 230 is located on the side of the first abutting portion 220 away from the opening 210.

[0058] In this embodiment, after the first abutting part 220 is provided around the opening 210 of the battery cover plate 200 near the battery, the second abutting part 230 can be provided around the first abutting part 220 on the side away from the opening 210. In this way, after the explosion-proof valve body 110 is opened, the waterproof and breathable membrane 120 can block non-gaseous substances such as electrolyte from splashing from the opening 210.

[0059] In some embodiments, such as Figure 1 , Figure 2 and Figure 3 As shown, the distance between the first abutting part 220 and the side of the battery cover 200 away from the battery is smaller than the distance between the second abutting part 230 and the side of the battery cover 200 away from the battery.

[0060] In this embodiment, to avoid increasing the thickness of the battery cover 200, the present application can recess the side of the battery cover 200 near the battery to form a first abutment 220 and a second abutment 230. The first abutment 220 and the second abutment 230 can form a stepped structure at the opening 210 to facilitate welding. At the same time, the recess depth of the first abutment 220 can be less than the recess depth of the second abutment 230, that is, the distance between the first abutment 220 and the side of the battery cover 200 away from the battery is less than the distance between the second abutment 230 and the side of the battery cover 200 away from the battery. This can prevent the waterproof and breathable membrane 120 from interfering with the opening of the explosion-proof valve body 110 after it is installed on the battery cover 200, thus preventing the problem of difficulty in opening the valve.

[0061] In some embodiments, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 7 and Figure 8As shown, the explosion-proof valve assembly 100 also includes a first fixing member 130 and a second fixing member 140; wherein, the first fixing member 130 is disposed on the side of the waterproof and breathable membrane 120 close to the battery, and the first fixing member 130 is configured to fix the waterproof and breathable membrane 120; the second fixing member 140 is disposed on the side of the waterproof and breathable membrane 120 away from the battery, and the second fixing member 140 is configured to fix the waterproof and breathable membrane 120.

[0062] In this embodiment, since the waterproof and breathable membrane 120 is a thin film structure, when it is installed at the opening 210, in order to avoid the waterproof and breathable membrane 120 being unable to block non-gaseous substances splashing after the valve is opened, the first fixing member 130 and the second fixing member 140 can be used to fix the waterproof and breathable membrane 120 at the second abutment portion 230.

[0063] Specifically, such as Figure 4 As shown, the waterproof and breathable membrane 120 can be disposed between the first fixing member 130 and the second fixing member 140 to form a waterproof and breathable whole. At the same time, in order to avoid the first fixing member 130 and the second fixing member 140 interfering with the breathability of the waterproof and breathable membrane 120 in the battery, the first fixing member 130 and the second fixing member 140 need to avoid the opening 210 of the battery cover plate 200. That is, the areas of the first fixing member 130 and the second fixing member 140 corresponding to the opening 210 can be hollowed out so that the explosion-proof valve body 110 can be quickly pushed out from the opening 210 after the battery thermal runaway.

[0064] In some embodiments, such as Figure 7 and Figure 8 As shown, the first fixing member 130 and / or the second fixing member 140 is an aluminum ring.

[0065] In this embodiment, the opening 210 of the battery cover 200 can be a circular opening, and both the first fixing member 130 and the second fixing member 140 can be aluminum rings. Specifically, the aluminum ring of the first fixing member 130 can be designed as a circular ring, and the aluminum ring of the second fixing member 140 can be designed as a flower shape. The flower-shaped design of the aluminum ring of the first fixing member 130 can fix the shape of the waterproof and breathable membrane 120 after the explosion-proof valve is opened, thereby further preventing non-gaseous substances such as electrolyte inside the battery from puncturing the waterproof and breathable membrane 120 and causing leakage.

[0066] It should be noted that the shapes of the first fastener 130 and the second fastener 140 can be selected according to actual applications, and this application does not impose specific limitations.

[0067] In some embodiments, such as Figure 5 and Figure 6As shown, the explosion-proof valve assembly 100 also includes a protective film 150; wherein, the protective film 150 is disposed on the side of the battery cover 200 away from the battery and closes the opening 210. Specifically, the protective film 150 can be a transparent plastic film, and the edge of the protective film 150 can be provided with a black coating, a portion of which can penetrate into the battery cover 200 to fix the protective film 150.

[0068] In some embodiments, such as Figure 1 and Figure 2 As shown, the explosion-proof valve body 110 is an explosion-proof aluminum sheet, and a protrusion 111 is provided on the side of the explosion-proof aluminum sheet away from the battery. The protrusion 111 is located inside the opening 210. Specifically, the explosion-proof valve body 110 can be an explosion-proof aluminum sheet, and a protrusion 111 is provided on the side of the explosion-proof aluminum sheet away from the battery so that the explosion-proof aluminum sheet can open the valve smoothly.

[0069] In some embodiments, the waterproof and breathable membrane 120 is a waterproof and breathable membrane made of polytetrafluoroethylene, or / and a waterproof and breathable membrane made of polytetrafluoroethylene derivatives, or / and a waterproof and breathable membrane made of polyvinyl chloride, or / and a waterproof and breathable membrane made of fiberglass.

[0070] In this embodiment, the waterproof and breathable membrane 120 can be a waterproof and breathable membrane made of polytetrafluoroethylene (PTFE), a waterproof and breathable membrane made of PTFE derivatives, a waterproof and breathable membrane made of polyvinyl chloride (PVC), or a waterproof and breathable membrane made of fiberglass. It can also be a waterproof and breathable membrane made of one or more of PTFE, PVC, and fiberglass.

[0071] Meanwhile, the quantity and thickness of the waterproof and breathable membrane 120 can be selected according to the actual application, and this application does not impose specific limitations.

[0072] In some embodiments, this application also provides a battery comprising:

[0073] Battery cell;

[0074] The battery cover 200 is configured to encapsulate the battery cell;

[0075] The battery cover 200 has an opening 210, and the explosion-proof valve assembly 100 provided by the second aspect is located at the opening 210.

[0076] In this embodiment, the battery can be formed by encapsulating the battery cell in a battery cover plate 200. The battery cover plate 200 has an opening 210, and an explosion-proof valve assembly 100 is provided at the opening 210. The explosion-proof valve assembly 100 includes an explosion-proof valve body 110 and a waterproof and breathable membrane 120. The explosion-proof valve body 110 is located on the side of the opening 210 of the battery cover plate 200 near the battery to close the opening 210. The waterproof and breathable membrane 120 is located on the side of the explosion-proof valve body 110 away from the opening 210 to cover the explosion-proof valve body 110. Thus, during the process of opening the explosion-proof valve to release pressure, the waterproof and breathable membrane 120 can block the flow of non-gaseous substances inside the battery, avoiding the splashing of non-gaseous substances such as electrolyte at the moment of valve opening, which greatly improves the safety and reliability of the battery.

[0077] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An explosion-proof valve assembly (100), characterized in that, include: An explosion-proof valve body (110) is provided on the side of the opening (210) of the battery cover (200) near the battery to close the opening (210); A waterproof and breathable membrane (120) is disposed on the side of the explosion-proof valve body (110) away from the opening (210) to cover the explosion-proof valve body (110).

2. The explosion-proof valve assembly (100) according to claim 1, characterized in that, The opening (210) has a first abutment (220) on the side near the battery. The first abutment (220) is recessed towards the side of the opening (210) away from the battery. The explosion-proof valve body (110) is fixed to the first abutment (220); or / and, The opening (210) has a second abutment (230) on the side near the battery. The second abutment (230) is recessed toward the side of the opening (210) away from the battery. The waterproof and breathable membrane (120) is fixed at the second abutment (230).

3. The explosion-proof valve assembly (100) according to claim 2, characterized in that, The second abutting portion (230) is located on the side of the first abutting portion (220) away from the opening (210).

4. The explosion-proof valve assembly (100) according to claim 2, characterized in that, The distance between the first abutting part (220) and the side of the battery cover (200) away from the battery is smaller than the distance between the second abutting part (230) and the side of the battery cover (200) away from the battery.

5. The explosion-proof valve assembly (100) according to any one of claims 1-4, characterized in that, The explosion-proof valve assembly (100) also includes a first fixing member (130); Wherein, the first fixing member (130) is disposed on the side of the waterproof and breathable membrane (120) near the battery, and the first fixing member (130) is configured to fix the waterproof and breathable membrane (120); or / and, The explosion-proof valve assembly (100) also includes a second fastener (140); The second fixing member (140) is located on the side of the waterproof and breathable membrane (120) away from the battery, and the second fixing member (140) is configured to fix the waterproof and breathable membrane (120).

6. The explosion-proof valve assembly (100) according to claim 5, characterized in that, The first fastener (130) and / or the second fastener (140) are aluminum rings.

7. The explosion-proof valve assembly (100) according to any one of claims 1-4, characterized in that, The explosion-proof valve assembly (100) also includes a protective membrane (150); The protective film (150) is located on the side of the battery cover (200) away from the battery and closes the opening (210).

8. The explosion-proof valve assembly (100) according to any one of claims 1-4, characterized in that, The explosion-proof valve body (110) is an explosion-proof aluminum sheet. A protrusion (111) is provided on the side of the explosion-proof aluminum sheet away from the battery. The protrusion (111) is located in the opening (210).

9. The explosion-proof valve assembly (100) according to any one of claims 1-4, characterized in that, The opening (210) is a circular opening (210); or / and, The waterproof and breathable membrane (120) is a waterproof and breathable membrane made of polytetrafluoroethylene, or / and a waterproof and breathable membrane made of polytetrafluoroethylene derivatives, or / and a waterproof and breathable membrane made of polyvinyl chloride, or / and a waterproof and breathable membrane made of fiberglass.

10. A battery, characterized in that, include: Battery cell; A battery cover (200) is configured to encapsulate the battery cell; The battery cover (200) has an opening (210), and the opening (210) is provided with an explosion-proof valve assembly (100) according to any one of claims 1-9.

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