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The single battery that makes up the power battery pack can not guarantee the complete consistency of the performance, resulting in the hidden danger of the safe operation of the battery pack. In order to provide a safe and reliable working environment for the power battery pack, grasp the working condition of the battery pack in real time, and prolong the service life of the battery pack, an on-line monitoring system of power battery based on wireless communication and sensor is designed. The system uses sensor, STC12C5A62S2 single chip microcomputer, wireless communication technology and MATLAB editing software to carry out electrical collection, data control processing, wireless transmission and display interface design. The main parameters of dynamic monitoring battery pack are single battery voltage and current, battery pack total voltage and total current, temperature. It is verified by repeated experiments that the accuracy of the monitoring system can be as high as 0.2% and the operation is stable and reliable. It can complete the real-time state interpretation control of the power battery pack and make on-line maintenance instructions for abnormal conditions.