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(de)電壓(ya)一(yi)般都在3.6V、3.8V和4.2V，遠高于鎳鎘和鎳氫電池的(de)1.2V電壓(ya)。

一般認為(wei)將(jiang)鋰電(dian)(dian)(dian)池(chi)(chi)(chi)的(de)空載電(dian)(dian)(dian)壓充(chong)到4.2V就認為(wei)電(dian)(dian)(dian)充(chong)滿(man)了，電(dian)(dian)(dian)池(chi)(chi)(chi)充(chong)電(dian)(dian)(dian)過(guo)程中,電(dian)(dian)(dian)池(chi)(chi)(chi)的(de)電(dian)(dian)(dian)壓在3.7V逐(zhu)漸上升到4.2V，鋰電(dian)(dian)(dian)池(chi)(chi)(chi)充(chong)電(dian)(dian)(dian)不能將(jiang)空載電(dian)(dian)(dian)壓充(chong)到4.2V以上的(de)，否則也會損害電(dian)(dian)(dian)池(chi)(chi)(chi)，這(zhe)就是(shi)鋰電(dian)(dian)(dian)池(chi)(chi)(chi)特殊(shu)的(de)地方(fang)。

鋰離子電池充電(dian)(dian)過(guo)程分為恒流(liu)快充階(jie)(jie)段和恒壓(ya)電(dian)(dian)流(liu)下降階(jie)(jie)段。恒流(liu)快速充電(dian)(dian)階(jie)(jie)段，電(dian)(dian)池(chi)(chi)電(dian)(dian)壓(ya)逐漸上升至電(dian)(dian)池(chi)(chi)標(biao)準(zhun)電(dian)(dian)壓(ya)，然后在控制芯片(pian)的(de)控制下進入恒壓(ya)階(jie)(jie)段。電(dian)(dian)量統計芯片(pian)通過(guo)對放(fang)電(dian)(dian)曲線(xian)的(de)記錄(lu)，可以對電(dian)(dian)池(chi)(chi)進行(xing)采樣計算。鋰(li)離(li)(li)子(zi)電(dian)(dian)池(chi)(chi)使用(yong)次數多了，放(fang)電(dian)(dian)曲線(xian)就(jiu)會發(fa)生(sheng)變化，雖然鋰(li)離(li)(li)子(zi)電(dian)(dian)池(chi)(chi)沒有記憶效應(ying)，但如(ru)果充電(dian)(dian)不當，會對電(dian)(dian)池(chi)(chi)的(de)性能(neng)造成很大的(de)影響(xiang)。

二、18650鋰電池充不進電怎么修復

造成18650充(chong)(chong)不進(jin)電(dian)(dian)(dian)(dian)的原因有電(dian)(dian)(dian)(dian)池的電(dian)(dian)(dian)(dian)極(ji)觸點(dian)生銹(xiu)或是不干凈(jing)，導致接觸電(dian)(dian)(dian)(dian)阻太(tai)大造成壓降太(tai)大，使得充(chong)(chong)電(dian)(dian)(dian)(dian)時充(chong)(chong)電(dian)(dian)(dian)(dian)裝置認(ren)為已經充(chong)(chong)滿(man)電(dian)(dian)(dian)(dian)而對其停(ting)止充(chong)(chong)電(dian)(dian)(dian)(dian)，這種情況只需要將(jiang)電(dian)(dian)(dian)(dian)極(ji)觸電(dian)(dian)(dian)(dian)進(jin)行清潔即可(ke)。

排(pai)除(chu)電(dian)池本身問題的情況下(xia)，檢(jian)查是否是充(chong)電(dian)器(qi)或是充(chong)電(dian)線(xian)存在問題，如果有(you)其他充(chong)電(dian)設(she)備(bei)可以更換一(yi)下(xia)試試，因為充(chong)電(dian)器(qi)和線(xian)出(chu)現故障也(ye)會引起18650充(chong)不進電(dian)。

如(ru)果是(shi)內部(bu)電(dian)(dian)(dian)路、電(dian)(dian)(dian)池(chi)本(ben)身以及電(dian)(dian)(dian)池(chi)壽命問題導致充不進(jin)電(dian)(dian)(dian)，建(jian)議(yi)(yi)直接更換電(dian)(dian)(dian)池(chi)。如(ru)果你(ni)非要拆解18650電(dian)(dian)(dian)池(chi)的(de)(de)話(hua)，要把電(dian)(dian)(dian)池(chi)中的(de)(de)電(dian)(dian)(dian)全部(bu)放掉，不過強(qiang)烈建(jian)議(yi)(yi)不要進(jin)行這(zhe)樣(yang)的(de)(de)操作。