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(dian)(dian)壓一般都在3.6V、3.8V和4.2V，遠高于鎳鎘和鎳氫電(dian)(dian)池的1.2V電(dian)(dian)壓。

一般認(ren)為將鋰電(dian)(dian)(dian)(dian)池的(de)空載電(dian)(dian)(dian)(dian)壓充(chong)(chong)到4.2V就認(ren)為電(dian)(dian)(dian)(dian)充(chong)(chong)滿了，電(dian)(dian)(dian)(dian)池充(chong)(chong)電(dian)(dian)(dian)(dian)過程中,電(dian)(dian)(dian)(dian)池的(de)電(dian)(dian)(dian)(dian)壓在(zai)3.7V逐漸上升到4.2V，鋰電(dian)(dian)(dian)(dian)池充(chong)(chong)電(dian)(dian)(dian)(dian)不能將空載電(dian)(dian)(dian)(dian)壓充(chong)(chong)到4.2V以上的(de)，否則也會損害電(dian)(dian)(dian)(dian)池，這就是鋰電(dian)(dian)(dian)(dian)池特殊的(de)地方。

鋰離子電池充(chong)電(dian)過程分為恒(heng)流快充(chong)階(jie)(jie)段和(he)恒(heng)壓(ya)(ya)電(dian)流下(xia)降階(jie)(jie)段。恒(heng)流快速充(chong)電(dian)階(jie)(jie)段，電(dian)池(chi)電(dian)壓(ya)(ya)逐漸(jian)上升至(zhi)電(dian)池(chi)標準電(dian)壓(ya)(ya)，然后(hou)在控制芯片的(de)控制下(xia)進(jin)入(ru)恒(heng)壓(ya)(ya)階(jie)(jie)段。電(dian)量統計芯片通過對放(fang)電(dian)曲(qu)線的(de)記錄(lu)，可以對電(dian)池(chi)進(jin)行采樣計算。鋰(li)離子電(dian)池(chi)使(shi)用次數多了(le)，放(fang)電(dian)曲(qu)線就(jiu)會(hui)(hui)發生變(bian)化(hua)，雖然鋰(li)離子電(dian)池(chi)沒有記憶效應，但如果(guo)充(chong)電(dian)不當，會(hui)(hui)對電(dian)池(chi)的(de)性能造成很大的(de)影響。

二、18650鋰電池充不進電怎么修復

造成18650充(chong)不進電(dian)(dian)的(de)原因(yin)有電(dian)(dian)池的(de)電(dian)(dian)極(ji)觸點生銹或(huo)是(shi)不干凈，導致接觸電(dian)(dian)阻太大(da)造成壓降(jiang)太大(da)，使(shi)得充(chong)電(dian)(dian)時充(chong)電(dian)(dian)裝置認為已經充(chong)滿電(dian)(dian)而對其(qi)停止充(chong)電(dian)(dian)，這種情(qing)況只需要將電(dian)(dian)極(ji)觸電(dian)(dian)進行清潔即(ji)可。

排除電(dian)(dian)(dian)池(chi)本身問題的情況下(xia)，檢查是(shi)(shi)否是(shi)(shi)充(chong)(chong)(chong)電(dian)(dian)(dian)器(qi)或是(shi)(shi)充(chong)(chong)(chong)電(dian)(dian)(dian)線(xian)存在問題，如果有(you)其他充(chong)(chong)(chong)電(dian)(dian)(dian)設(she)備可以更換一下(xia)試試，因為(wei)充(chong)(chong)(chong)電(dian)(dian)(dian)器(qi)和線(xian)出現(xian)故障也會(hui)引起18650充(chong)(chong)(chong)不進電(dian)(dian)(dian)。

如果(guo)是內(nei)部電(dian)路、電(dian)池(chi)(chi)本身以及電(dian)池(chi)(chi)壽命問題導致(zhi)充不進(jin)電(dian)，建(jian)議直接更(geng)換電(dian)池(chi)(chi)。如果(guo)你(ni)非要拆解18650電(dian)池(chi)(chi)的(de)(de)話，要把電(dian)池(chi)(chi)中的(de)(de)電(dian)全部放(fang)掉，不過強(qiang)烈建(jian)議不要進(jin)行這樣的(de)(de)操作。