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1、电池保护板(ban)处于正常状(zhuang)态

锂电(dian)(dian)池(chi)(chi)保护板在(zai)正(zheng)常状(zhuang)态下电(dian)(dian)路(lu)N1的(de)“CO”和“DO”引脚输出高压，两个MOSFET处(chu)于导(dao)通状(zhuang)态，电(dian)(dian)池(chi)(chi)可(ke)以自由充放电(dian)(dian)，因为MOSFET的(de)阻抗小，常见小于30mm，所以导(dao)通电(dian)(dian)阻对电(dian)(dian)路(lu)性(xing)能影响不大。

2、过充保护

锂离子电(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)充(chong)(chong)(chong)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)方式有两种，即恒(heng)(heng)流和恒(heng)(heng)压。充(chong)(chong)(chong)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)初期为恒(heng)(heng)流充(chong)(chong)(chong)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)，然后电(dian)(dian)(dian)(dian)(dian)(dian)(dian)压增(zeng)加(jia)到(dao)4.2V进入恒(heng)(heng)压充(chong)(chong)(chong)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)，直到(dao)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)流越(yue)(yue)来越(yue)(yue)小。当电(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)失去控(kong)制，充(chong)(chong)(chong)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)压增(zeng)加(jia)到(dao)4.3V以上时(shi)，电(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)反应(ying)加(jia)剧，易导致电(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)损坏(huai)或(huo)安全问(wen)题(ti)，这时(shi)保护电(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)切断充(chong)(chong)(chong)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)，使(shi)充(chong)(chong)(chong)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)器不(bu)能再对电(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)充(chong)(chong)(chong)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)，产生过(guo)充(chong)(chong)(chong)保护作用(yong)。

3、短路保护

电(dian)池在负(fu)载(zai)放电(dian)过(guo)程中，如果回路(lu)电(dian)流大到足(zu)以使U>0.9V，控制IC就判(pan)断为(wei)负(fu)载(zai)短路(lu)，其“DO”引脚会迅速由(you)高电(dian)压变为(wei)零电(dian)压，使V1由(you)on变为(wei)off，从(cong)而切断放电(dian)电(dian)路(lu)，启(qi)动短路(lu)保护功(gong)能。

4、过流保护

由(you)于(yu)锂(li)离子电(dian)(dian)(dian)池(chi)的化学特性，电(dian)(dian)(dian)池(chi)厂家已(yi)规定(ding)大放(fang)电(dian)(dian)(dian)电(dian)(dian)(dian)流不能(neng)超(chao)过2C。如果放(fang)电(dian)(dian)(dian)电(dian)(dian)(dian)流超(chao)过2C，电(dian)(dian)(dian)池(chi)将会永(yong)久损坏或出现安全问(wen)题。

5、过放电保护

当锂电(dian)(dian)(dian)(dian)(dian)池(chi)向(xiang)外部负载(zai)放(fang)电(dian)(dian)(dian)(dian)(dian)时，其(qi)电(dian)(dian)(dian)(dian)(dian)压(ya)会放(fang)电(dian)(dian)(dian)(dian)(dian)，当电(dian)(dian)(dian)(dian)(dian)池(chi)电(dian)(dian)(dian)(dian)(dian)压(ya)降至2.5V时，其(qi)容量已被用完，这时如(ru)果电(dian)(dian)(dian)(dian)(dian)池(chi)继续向(xiang)负载(zai)放(fang)电(dian)(dian)(dian)(dian)(dian)，就会对电(dian)(dian)(dian)(dian)(dian)池(chi)造(zao)成永久性的损(sun)坏。在电(dian)(dian)(dian)(dian)(dian)池(chi)放(fang)电(dian)(dian)(dian)(dian)(dian)过程(cheng)中(zhong)，当控制IC检测(ce)到电(dian)(dian)(dian)(dian)(dian)池(chi)电(dian)(dian)(dian)(dian)(dian)压(ya)低于2.3 V时，“DO”脚(jiao)由高电(dian)(dian)(dian)(dian)(dian)压(ya)转零(ling)电(dian)(dian)(dian)(dian)(dian)压(ya)，V1由导通转关断，从而切断放(fang)电(dian)(dian)(dian)(dian)(dian)电(dian)(dian)(dian)(dian)(dian)路，使电(dian)(dian)(dian)(dian)(dian)池(chi)不能再向(xiang)负载(zai)放(fang)电(dian)(dian)(dian)(dian)(dian)，达到过放(fang)电(dian)(dian)(dian)(dian)(dian)保护的效果。