Method, device and equipment for determining SOC (State of Charge) during trickle charging of vehicle battery and medium

The invention provides a method, a device and equipment for determining SOC during trickle charging of a vehicle battery and a medium, and the method comprises the steps: obtaining corresponding fast charging current values and fast charging voltage values under different battery charging states SOC when a battery system of a vehicle is subjected to fast charging; when a battery system of a vehicle is charged by adopting OBC charging current of a vehicle-mounted charger, OBC current values and OBC voltage values corresponding to different SOCs are obtained; calculating the dynamic internal resistance of the vehicle battery system based on the fast charging voltage value, the fast charging current value, the OBC voltage value and the OBC current value; performing linear difference calculation on the fast charging current value, the fast charging voltage value, the OBC current value and the OBC voltage value to obtain a mapping curve; acquiring a current value of OBC trickle state charging; based on the mapping