Current precision detection method, system and device based on BMS communication and medium

The invention provides a current precision detection method, system and device for a vehicle-mounted battery and a medium in the technical field of electric vehicles, and the method comprises the following steps: S10, after a charging pile is connected with an electric vehicle, the charging pile and the electric vehicle carry out handshake interaction; s20, the charging pile sets a detection duration, a sampling period, a detection condition and a charging current with a fixed size; the sampling period is shorter than the detection duration; s30, the charging pile charges a battery of the electric vehicle based on the charging current, detects a first current value of the battery based on the detection duration, the sampling period and the detection condition, and communicates with a BMS of the electric vehicle to obtain a second current value detected by the BMS; and S40, the charging pile calculates the current precision based on the first current values and the second current values. The method has the adv