Battery SOC value is an important parameter of electric vehicle control. As battery management module is a key component of the electric vehicle, SOC estimation plays a very important role in electric vehicle battery management. The SOC estimation technology and management module for electric car is adapted to Lithium ion, nickel metal hydride, etc. Main technical indicators: Voltage detection accuracy of ± 0.6%, current detection accuracy ± 0.5%, temperature detection accuracy of ± 0.5 ℃, SOC estimation accuracy of 5%.