Power battery all-weather constant temperature control system and method

The invention discloses a power battery all-weather constant temperature control system and method, and belongs to the field of battery temperature control. Each battery cell unit comprises a battery cell body and a tubular copper coil; the refrigeration module comprises a heat exchange plate, a battery pack heat dissipation shell and a magnetic refrigeration device, the tubular copper coil is communicated with the heat exchange plate through a pipeline, and cooling liquid is arranged in the tubular copper coil and the heat exchange plate; the magnetic refrigeration device is used for periodically absorbing heat of the cooling liquid in the heat exchange plate and periodically releasing the absorbed heat; the heating module comprises a high-frequency induction controller, a power supply wire harness and a tubular copper coil, the high-frequency induction controller supplies ultrahigh-frequency alternating current to the tubular copper coil, the ultrahigh-frequency alternating current generates an ultrahigh-fr