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近年来，大多数的(de)电(dian)(dian)(dian)子产品都使(shi)用锂(li)电(dian)(dian)(dian)池(chi)(chi)(chi)作为主要(yao)电(dian)(dian)(dian)源，锂(li)电(dian)(dian)(dian)池(chi)(chi)(chi)具有(you)体积小、能量密度高(gao)(gao)、无记忆效应(ying)、循环(huan)寿命高(gao)(gao)、自放电(dian)(dian)(dian)率低、电(dian)(dian)(dian)压高(gao)(gao)等特点(dian)，但其与(yu)镍(nie)(nie)镉、镍(nie)(nie)氢电(dian)(dian)(dian)池(chi)(chi)(chi)不(bu)同，在(zai)(zai)充电(dian)(dian)(dian)和(he)放电(dian)(dian)(dian)时需要(yao)考虑(lv)安全性(xing)，因此(ci)，针(zhen)对锂(li)电(dian)(dian)(dian)池(chi)(chi)(chi)的(de)过充、放电(dian)(dian)(dian)、过流和(he)短(duan)路电(dian)(dian)(dian)流保(bao)护(hu)显(xian)得更为重(zhong)要(yao)，因此(ci)，通(tong)常在(zai)(zai)电(dian)(dian)(dian)池(chi)(chi)(chi)组中(zhong)设计保(bao)护(hu)电(dian)(dian)(dian)路对锂(li)电(dian)(dian)(dian)池(chi)(chi)(chi)进行保(bao)护(hu)，这(zhei)说(shuo)明了锂(li)电(dian)(dian)(dian)池(chi)(chi)(chi)保(bao)护(hu)ic的(de)重(zhong)要(yao)性(xing)。

锂离子电(dian)池(chi)能量密(mi)度高，很难保证(zheng)(zheng)电(dian)池(chi)的(de)(de)(de)(de)安全。在(zai)过(guo)充(chong)电(dian)状态(tai)下，电(dian)池(chi)温度升高后(hou)能量会过(guo)剩(sheng)，电(dian)解液(ye)分解成气体，内压(ya)升高而导致着火(huo)或破(po)裂。反之，在(zai)过(guo)度放电(dian)状态(tai)下，电(dian)解液(ye)的(de)(de)(de)(de)分解会导致电(dian)池(chi)特性(xing)和耐久(jiu)性(xing)的(de)(de)(de)(de)恶化(hua)。锂离子电(dian)池(chi)的(de)(de)(de)(de)保护(hu)电(dian)路(lu)就是为了保证(zheng)(zheng)这种过(guo)充(chong)放电(dian)状态(tai)的(de)(de)(de)(de)安全性(xing)，防止特性(xing)恶化(hua)。

当锂电(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)过充(chong)(chong)(chong)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)，为了避(bi)免温度升高(gao)造(zao)成内压(ya)力升高(gao)，需停止(zhi)充(chong)(chong)(chong)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)状态(tai)。保护IC将检(jian)(jian)测电(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)压(ya)，当检(jian)(jian)测到(dao)过充(chong)(chong)(chong)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)时(shi)，过充(chong)(chong)(chong)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)检(jian)(jian)测功率MOSFET将其关(guan)闭(bi)，切断充(chong)(chong)(chong)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)。在对(dui)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)充(chong)(chong)(chong)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)时(shi)，将电(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)充(chong)(chong)(chong)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)到(dao)满(man)状态(tai)是(shi)用户非常关(guan)心的问题，同时(shi)也要考虑到(dao)安全问题，所以有(you)必要在达到(dao)允许(xu)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)压(ya)时(shi)切断充(chong)(chong)(chong)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)状态(tai)。