Explosion-proof valve, battery pack, and apparatus
Embodiments of this application provide an explosion-proof valve, a battery pack, and an apparatus. The explosion-proof valve includes a flame arresting member and an air permeable membrane. The flame arresting member is configured to connect to a housing of a battery pack, the air permeable membrane is fastened to the flame arresting member, and the battery pack is capable of exchanging gas with the outside through the flame arresting member and the air permeable membrane in sequence. During use of the explosion-proof valve of this application in the battery pack of this application, when thermal runaway occurs inside the housing of the battery pack, pressure inside the housing is suddenly increased, and as a result, the battery pack releases the pressure through the explosion-proof valve, and high-temperature runaway gas impacts and melts the air permeable membrane, forming a smooth air flow channel.
1. An explosion-proof valve, comprising a flame arresting member and an air permeable membrane, wherein
the flame arresting member is configured to connect to a housing of a battery pack, the air permeable membrane is fastened to the flame arresting member, and the battery pack is capable of exchanging gas with the outside through the flame arresting member and the air permeable membrane in sequence; and,
wherein the flame arresting member comprises a flame arrester assembly and a main body, wherein
the main body has an inlet end and an outlet end, wherein the inlet end communicates with an interior of the housing, and the outlet end communicates with the flame arrester assembly, and a cross-sectional area of an interior surface of the main body gradually increases from the inlet end to the outlet end; and the air permeable membrane is fastened to the flame arrester assembly.
2. The explosion-proof valve according to claim 1 , wherein
the flame arrester assembly has a first end distal from the outlet of the main body and a second end disposed proximal to the outlet end of the main body;
the air permeable membrane is fastened to the first end; and
the outlet end of the main body is connected to the second end, and the inlet end of the main body is connected to the housing.
3. The explosion-proof valve according to claim 2 , wherein the explosion-proof valve further comprises a first filter structure, wherein the first filter structure is disposed at the inlet end of the main body.
4. The explosion-proof valve according to claim 3 , wherein
a flow channel communicating the inlet end and the outlet end is formed inside the main body; and
the explosion-proof valve further comprises a second filter structure, wherein the second filter structure is disposed inside the flow channel of the main body.
5. The explosion-proof valve according to claim 4 , wherein
the second filter structure is movably disposed inside the flow channel of the main body; and
the explosion-proof valve further comprises an elastic member, wherein the elastic member is configured to connect the second filter structure and the flame arrester assembly.
6. The explosion-proof valve according to claim 5 , wherein the first filter structure and the second filter structure are filter meshes, and the mesh number of the first filter structure is less than the mesh number of the second filter structure.
7. The explosion-proof valve according to claim 2 , wherein a plurality of heat sinks are disposed on an exterior wall of the main body, and the plurality of heat sinks are alternately disposed on the exterior wall along a circumference of the main body.
8. The explosion-proof valve according to claim 1 , wherein the flame arrester assembly comprises a flame arresting disk and a flame arresting disk housing, wherein the flame arresting disk is fastened inside the flame arresting disk housing, and the flame arresting disk housing is fastened to the outlet end of the main body.
9. The explosion-proof valve according to claim 8 , wherein a plurality of channels are formed on a cross section of the flame arresting disk.
10. The explosion-proof valve according to claim 9 , wherein the channels of the flame arresting disk has a planar surface and has triangular gaps in the planar surface.
11. The explosion-proof valve according to claim 1 , wherein the explosion-proof valve further comprises a valve cover, wherein
the valve cover is configured to detachably connect to the flame arrester assembly, the valve cover is provided with an air vent, and the air permeable membrane is located between the valve cover and the flame arrester assembly.
12. A battery pack, comprising the explosion-proof valve according to claim 1 , a housing, and a plurality of battery modules, wherein
the plurality of battery modules are accommodated in the housing; and
the explosion-proof valve is disposed on the housing and communicates with an interior of the housing.
13. An apparatus, characterized by comprising the battery pack according to claim 12 , wherein the battery pack is configured to provide electrical energy.