一、18650鋰電池充電電壓是多少

4.2V是電池充電的最高限制電壓。18650鋰電池的電壓一(yi)般都在(zai)3.6V、3.8V和4.2V，遠高于鎳(nie)鎘和鎳(nie)氫電池(chi)的1.2V電壓。

一般(ban)認為(wei)將(jiang)鋰電(dian)池(chi)的空載(zai)電(dian)壓(ya)充到4.2V就認為(wei)電(dian)充滿了，電(dian)池(chi)充電(dian)過程中,電(dian)池(chi)的電(dian)壓(ya)在3.7V逐漸(jian)上(shang)升到4.2V，鋰電(dian)池(chi)充電(dian)不能將(jiang)空載(zai)電(dian)壓(ya)充到4.2V以上(shang)的，否則也會損(sun)害電(dian)池(chi)，這就是鋰電(dian)池(chi)特殊(shu)的地方。

鋰離子電池充(chong)(chong)電(dian)(dian)過程分(fen)為恒(heng)(heng)流快充(chong)(chong)階段(duan)和恒(heng)(heng)壓電(dian)(dian)流下(xia)降階段(duan)。恒(heng)(heng)流快速充(chong)(chong)電(dian)(dian)階段(duan)，電(dian)(dian)池電(dian)(dian)壓逐漸上升(sheng)至電(dian)(dian)池標準電(dian)(dian)壓，然(ran)后在(zai)控制(zhi)芯片的控制(zhi)下(xia)進(jin)入(ru)恒(heng)(heng)壓階段(duan)。電(dian)(dian)量統(tong)計(ji)芯片通(tong)過對放電(dian)(dian)曲(qu)(qu)線(xian)的記錄，可(ke)以對電(dian)(dian)池進(jin)行采樣計(ji)算。鋰離子電(dian)(dian)池使用次數多(duo)了，放電(dian)(dian)曲(qu)(qu)線(xian)就會發生變化，雖然(ran)鋰離子電(dian)(dian)池沒有記憶效應，但如果(guo)充(chong)(chong)電(dian)(dian)不(bu)當，會對電(dian)(dian)池的性能造成很大的影響。

二、18650鋰電池充不進電怎么修復

造(zao)(zao)成18650充不進(jin)(jin)電(dian)(dian)(dian)的原因有電(dian)(dian)(dian)池的電(dian)(dian)(dian)極觸(chu)點(dian)生銹或是不干凈，導(dao)致接觸(chu)電(dian)(dian)(dian)阻太大造(zao)(zao)成壓降太大，使得(de)充電(dian)(dian)(dian)時(shi)充電(dian)(dian)(dian)裝置認為(wei)已經充滿電(dian)(dian)(dian)而對其(qi)停止充電(dian)(dian)(dian)，這種情況只需要將(jiang)電(dian)(dian)(dian)極觸(chu)電(dian)(dian)(dian)進(jin)(jin)行清潔即(ji)可。

排除(chu)電池本身問(wen)題的情況下，檢查是(shi)否是(shi)充(chong)電器或是(shi)充(chong)電線(xian)存在問(wen)題，如(ru)果有(you)其他充(chong)電設備可以更換一下試試，因(yin)為充(chong)電器和線(xian)出(chu)現故(gu)障也會引起18650充(chong)不進電。

如(ru)果是內部電(dian)(dian)路、電(dian)(dian)池本身(shen)以及電(dian)(dian)池壽命問題(ti)導致充不(bu)進電(dian)(dian)，建(jian)議(yi)直接(jie)更換電(dian)(dian)池。如(ru)果你非要拆解18650電(dian)(dian)池的話，要把電(dian)(dian)池中(zhong)的電(dian)(dian)全(quan)部放掉，不(bu)過強烈建(jian)議(yi)不(bu)要進行這(zhe)樣的操(cao)作。