The　purpose　of　the　battery　management　system　is　to　improve　the　efficiency　and　prolong　cycling　life　of　the　battery　pack　which　is　connected　in　series,　SH79F329　is　used　as　the　main　control　IC　of　the　hardware.　The　system　can　detect　the　voltage,　current,　temperature　of　the　battery　by　AD　sampling,　and　can　calculate　the　SOC　by　the　value　of　current　and　the　way　of　SOC　algorithm,as　well　as　communicating　with　the　host　computer.　and　it　has　been　implemented　in　the　process　of　charging　equalization,　overcharge　protection,　overdischarge　protection　and　a　series　of　other　processes.　It　proves　that　this　design　has　high　reliability　and　real-time　performance　in　the　test.　©　(2014)　Trans　Tech　Publications,　Switzerland.