本发明涉及一种锂电池组SOC测定装置及方法，属于新能源测控领域。该方法针对锂电池组SOC测定目标，通过构建锂电池组针对性电池维护与测试系统（Battery Maintenance and Test System，BMTS）平台准确测定SOC值；通过RS485总线机制实现其组网控制，并配备有嵌入式监视与控制通用系统（Monitor and Control Generated System，MCGS）和工控机（Industrial Personal Computer，IPC）实现本地控制和远程控制；增加航空头并分配跳线识别码以提高对多种锂电池组的适应性；通过在主充放电回路中增设独立保护单元IPU以实现三级保护。该方法在恒流CC放电基础上，融入串联充电转均衡充电过程以提高锂电池组容量利用效率；通过恒流（Constant Current，CC）充电转恒压（Constant Voltage，CV）充电模式切换解决每个电池单体的电量充满问题，实现对SOC值的有效测定。
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