Nowadays, compared with the environmental pollution caused by traditional fuel vehicles, new energy vehicles have been developed vigorously with the advantage of zero emission. Battery management system (BMS) as one of the core of the new energy vehicles, can monitor the status of battery, improve the utilization rate of the battery, prevent the battery from over-charge and over-discharge, to some extent, prolong the service life of the battery. To design a battery management system hardware circuit with basic functions, this paper uses the XC2267M of Infineon Corporation as the main control chip. The system uses the master-slave structure. The slave control chip is XC886 that completes the collection of the basic information of the battery and passes message through the internal CAN network to the XC2267M, which realizes the functions of information processing and SOC estimation and communicates with other modules and so on. At last, the functions of battery information collection, CAN communication, information storage and battery equalization can be completed.