SMT-S20S40M-SMTV1.0 is a power battery management system developed by Shenzhen Smart Electronics Co., Ltd. for 20 series electric motors; Realize the protection and alarm functions of overcharge, overdischarge, charging over-current, discharge over-current, discharge short circuit, high and low temperature, etc; Intelligent balance function can effectively improve the cycle life of battery pack; The battery capacity is calculated by monitoring the voltage, current and temperature in real time; It has the function of history record, which is convenient to trace; UART interface can be connected with the host computer to monitor the battery information in real time; CAN interface can realize cascade communication between batteries: firmware can be upgraded through communication interface