Exhaust filter system for battery pack

An exhaust filter system for a battery pack, comprising an explosion-proof valve and a filter apparatus, wherein one end of the explosion-proof valve is connected to a battery pack, the other end of the explosion-proof valve is connected to the filter apparatus, the filter apparatus comprises an introduction port, a discharge port, a housing, and a filter mechanism, the introduction port and the discharge port are separately disposed at two ends of the housing, the filter mechanism is disposed inside the housing, and the filter mechanism is provided with a plurality of filter holes, and

• wherein the filter mechanism comprises a first filter plate unit and a second filter plate unit, the first filter plate unit and the second filter plate unit are separately disposed on two sides of the filter mechanism in a conveyance direction, the first filter plate unit comprises at least two first filter plates disposed at an interval, the second filter plate unit comprises at least two second filter plates disposed at an interval, in the conveyance direction of the filter mechanism, the at least two first filter plates are arranged in descending order of hole diameters of the filter holes, and the at least two second filter plates are arranged in descending order of hole diameters of the filter holes.