鋰電池充電器的基本要求是特定的充電電流和充電電壓，從而保證電池安全充電。增加其它充電輔助功能是為了改善電池壽命，簡化充電器的操作，其中包括給過放電的電池使用涓流充電、電池電壓檢測、輸入電流限制、充電完成后關斷充電器、電(dian)池部分放電(dian)后自動(dong)啟動(dong)充電(dian)等。

　　鋰離子電池的充電過程可以分為四個階段：涓流充電（低壓預充）、恒流充電、恒壓充電以及充電終止。
　　鋰電池充電器的基本要求是特定的充電電流和充電電壓，從而保證電池安全充電。增加其它充電輔助功能是為了改善電池壽命，簡化充電器的操作，其中包括給過放電的電池使用涓流充電、電池電壓檢測、輸入電流限制、充電完成后關斷充電器、電池部分放電后自動啟動充電等。
　　鋰電池的(de)(de)充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)方(fang)式是限壓(ya)(ya)(ya)恒(heng)(heng)流(liu)(liu)，都是由IC芯片控制的(de)(de)，典(dian)型的(de)(de)充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)方(fang)式是：先檢測待充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)池的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)，如(ru)果電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)低于3V，要先進行預充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)，充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)為(wei)設定電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)的(de)(de)1/10，電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)升(sheng)到(dao)3V后(hou)，進入(ru)標準充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)過(guo)程。標準充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)過(guo)程為(wei)：以設定電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)進行恒(heng)(heng)流(liu)(liu)充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)，電(dian)(dian)(dian)(dian)(dian)(dian)池電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)升(sheng)到(dao)4.20V時(shi)，改為(wei)恒(heng)(heng)壓(ya)(ya)(ya)充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)，保持充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)為(wei) 4.20V。此時(shi)，充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)逐漸(jian)下(xia)(xia)降，當(dang)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)下(xia)(xia)降至設定充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)的(de)(de)1/10時(shi)，充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)結(jie)束。下(xia)(xia)圖(tu)為(wei)充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)曲線。

　　階段1：涓流充電——涓流充電用來先對完全放電的電池單元進行預充(恢復性充電)。在電池電壓低于3V左右時采用涓流充電，涓流充電電流是恒流充電電流的十分之一即0.1c(以恒定充電電流為1A舉例，則涓流充電電流為100mA)，
　　階段2：恒流充電——當電池電壓上升到涓流充電閾值以上時，提高充電電流進行恒流充電。恒流充電的電流在0.2C至 1.0C之間。電池電壓隨著恒流充電過程逐步升高,一般單節電池設定的此電壓為3.0-4.2V.
　　階(jie)(jie)段3：恒(heng)壓(ya)充(chong)(chong)電(dian)(dian)(dian)(dian)—— 當(dang)(dang)電(dian)(dian)(dian)(dian)池電(dian)(dian)(dian)(dian)壓(ya)上升到(dao)4.2V時，恒(heng)流充(chong)(chong)電(dian)(dian)(dian)(dian)結束，開(kai)始恒(heng)壓(ya)充(chong)(chong)電(dian)(dian)(dian)(dian)階(jie)(jie)段。電(dian)(dian)(dian)(dian)流根據電(dian)(dian)(dian)(dian)芯的(de)飽和程(cheng)度(du)，隨著充(chong)(chong)電(dian)(dian)(dian)(dian)過程(cheng)的(de)繼(ji)續充(chong)(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流由最大值慢慢減少，當(dang)(dang)減小到(dao)0.01C時，認(ren)為(wei)充(chong)(chong)電(dian)(dian)(dian)(dian)終止(zhi)。（C是以電(dian)(dian)(dian)(dian)池標稱容量對照電(dian)(dian)(dian)(dian)流的(de)一種表示方法，如(ru)電(dian)(dian)(dian)(dian)池是1000mAh的(de)容量，1C就是充(chong)(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流1000mA。）