Split independent air duct system for heat dissipation of soft package lithium battery capacity grading equipment

A divided independent air duct system for heat dissipation of soft package lithium battery capacity grading equipment comprises a bottom layer air duct, a top layer air duct and a bottom layer air duct, the bottom layer air duct comprises at least one bottom layer straight-through exhaust duct, a bottom air inlet of the bottom layer straight-through exhaust duct is communicated with an air outletof the bottommost layer equipment, and a top air outlet of the bottom layer air duct is straight-through to the top of the top layer equipment; the middle-layer air duct comprises at least one middlestraight-through exhaust duct, a bottom air inlet of the middle straight-through exhaust duct is communicated with an air outlet of the corresponding middle-layer equipment, and a top air outlet of the middle straight-through exhaust duct is directly communicated to the top of the top-layer equipment; and the top-layer air duct is arranged at the air outlet of the top-layer equipment, an air inletis formed in the wall of t