the definition of the battery protection board

The protection function of lithium battery is usually completed by the cooperation of the protection circuit board and PTC or TCO and other current devices. The protection board is composed of electronic circuits. It can accurately monitor the voltage of the cell and the current of the charging and discharging circuit at the time of -40℃ to +85℃, and control the on-off of the current circuit immediately.  PTC or TCO protects the battery from severe damage at high temperatures.