Braking energy recycling and testing method and system of electric vehicle

The invention provides a braking energy recycling and testing method and system of an electric vehicle. The method comprises the steps of testing a sliding condition and a braking condition of a tested vehicle in a standard test site; acquiring an initial speed and a tail speed of the vehicle, and calculating a kinetic energy changing value of the vehicle; acquiring a charging voltage and a charging current of a power battery during sliding or braking, and performing calculation to obtain a power value generated by braking energy; calculating to obtain braking energy recycling efficiency according to the kinetic energy changing value and the power value; and taking the braking energy recycling efficiency of different shifts under the sliding condition or the braking condition as an energyrecycling evaluation index. By the method, the problems of large test result deviation and low accuracy during braking energy recycling test of a traditional electric vehicle can be solved, and the reliability and the conveni