保护电路模块（pcm） the cell/battery pack shall be with a pcm that can protect cell/battery pack properly. pcm shall have functions of (1) overcharging prevention, (2) over-discharging prevention, and (3) over current prevention to maintain safety and prevent significant deterioration of cell performance. the over current can occur by external short circuit 电芯/电池包装应配有pcm以正确保护电芯/电池。pcm应具备以下功能以保证安全并防止损坏电芯性能：1）过充电保护；2）过放电保护；3）过流保护。 3.1 overcharging prohibition: overcharging prevention function shall stop charging if any one of the cells of the battery pack reaches 4.25v. 过充电保护 当电池中任一电芯的电压达4.25v时，过充电保护功能应立刻启动并停止充电。 3.2 over-discharging prohibition: over-discharging prevention function shall work to avoid further drop in cell voltage of 2.3v or less per cell in any cell of the battery pack. it is recommended that the dissipation current of pcm shall be minimized to 0.5ua or less with the over-discharge prevention. the protection function shall monitor each bank of the battery pack and control the current all the time. 过放电保护 当电池任一电芯的电压降至2.3v以下时，过放保护功能应起着保护作用以避免电芯的深度放电。 推荐pcm的静态电流小于0.5 ua，并具有过放保护功能。 该保护功能应实时监控所有电池。 湖南合一能源科技有限公司，低温电池、低温锂电池、温锂电池、低温18650锂电池、18650动力电池组、铁锂电池组、矿用锂离子电池、低温高倍率电池、储能锂电池组生产制造专家，更多产品信息详见合一电池工厂网站。 （以上价格仅供参考，具体价格以实际详谈为准。）