Battery thermal management is based on the influence of temperature on battery performance, combined with the electrochemical characteristics and heat generation mechanism of the battery, based on the optimal charge and discharge temperature range of the specific battery, through reasonable design, based on materials science, electrochemistry, heat transfer. It is a new technology to improve the overall performance of the battery by solving the problem of heat dissipation or thermal runaway caused by the battery working under the condition of too high or too low temperature, based on the multi-disciplinary and multi-field basis of science and molecular dynamics.