BATTERY MONITORING SYSTEM AND SEMICONDUCTOR DEVICE

A battery monitoring system includes a plurality of battery cells connected in series; a cell voltage measurement circuit for measuring a voltage of the battery cells; a first terminal connected to the cell voltage measurement circuit; a second terminal isolated from the cell voltage measurement circuit; a plurality of protection elements each corresponding to each of the battery cells; and a protection circuit connected to the second terminal for discharging an electric current from the protection elements through the second terminal.