Pressure equalization device for a battery housing

Abstract

The invention relates to a pressure equalization device (1, 101, 301) for a battery housing. The device comprises a cage (2, 102, 302) forming a fluid passage (23, 123, 323) and a valve member (3, 103, 203, 303) covering the fluid passage. The valve member comprises a hole (33, 133, 233, 333) through its thickness and a membrane (34, 134, 234, 334) attached to the valve member and covering the hole. The membrane is configured to equalize, when in use, the pressure inside the battery housing with the ambient pressure outside the battery housing, while the valve member is configured to move or distort reversibly at a preset pressure difference between the inside and the outside of the battery housing to prevent overpressure inside the battery housing.

Dependencies are inferred from the claim text.