Current sensor for electric vehicle and detecting method by means of same

The invention provides a current sensor for an electric vehicle. The current sensor comprises a Hall element. The Hall element is electrically connected with a voltage signal collector in an interactive mode, the output end of the voltage signal collector is connected with the input end of a microprocessor, and the working power of the microprocessor and the working power of the voltage signal collector are both provided by a power circuit. The invention further provides a method for detecting currents of a power battery by means of the current sensor. According to the current sensor and the detecting by means of the current sensor, the Hall element is adopted to produce a magnetic field around an energized conductor, wherein the magnetic field is in direct proportion to the currents of the power battery, the currents of the current-carrying conductor are indirectly measured through the method of measuring Hall potentials, and therefore the purposes of detecting the total currents of the power battery and charging and discharging states of the power battery are achieved. The processing amount of the microprocessor is reduced, the circuit structure is simple, interference to voltage signals is small, and a detected value is relatively precise.