This paper introduces a new two-speed planetary gear automatic transmission using Laundry Care an electronically controlled wedge clutch.In order to verify the feasibility of using this transmission in pure electric vehicles, the influencing factors of the two-speed transmission due to the increase in mass and the reduction in transmission efficiency are introduced.The vehicle simulation model was established on the MATLAB/Simulink platform, and the dynamic programming method was used to optimize the transmission ratio and shifting law.The simulation results show that Defrost Cutout Thermostat the use of a two-speed automatic transmission can effectively improve the economic performance and dynamic performance of battery electric vehicles.