Detachable explosion-proof type multi-stage controllable pressure relief device

The utility model discloses a detachable explosion-proof multi-stage controllable pressure relief device, and relates to the field of battery safety, the detachable explosion-proof multi-stage controllable pressure relief device comprises a protective cover, the protective cover is used for communicating with a battery box shell, one section, extending into the battery box shell, of the protective cover is fixedly connected with a filter screen, one end, far away from the battery box shell, of the protective cover is provided with an air hole, and the air hole is communicated with the filter screen. An explosion venting sheet is also arranged in the protective cover; a filtering device is also arranged in the protective cover; the filter screen is additionally arranged in the shell, the two layers of metal sintering sheets are arranged in the device, the filtering range is from large to small, multi-stage pressure relief is achieved, and the pressure relief reliability of the device is improved. The whole str