Energy recovery method, battery management system, battery pack and vehicle

The invention discloses an energy recovery method, a battery management system, a battery pack and a vehicle, the energy recovery method comprises the steps that in response to the vehicle entering a braking mode, a first polarization value and a second polarization value of a battery in the vehicle under multiple charging currents are determined, and the polarization types of the first polarization value and the second polarization value are different; and according to the first polarization value and the second polarization value, improving the anode potential of the battery in the recharging process so as to increase the recharging current. Therefore, on the basis of not changing the battery cell and not increasing the additional cost, the recharging current can be increased by increasing the anode potential of the battery in the recharging process, the energy recovery efficiency of the vehicle is improved, and the endurance mileage of the vehicle is further improved.