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鋰電池的電壓一般都在3.6V、3.8V和(he)4.2V，遠高(gao)于鎳鎘和(he)鎳氫電池的1.2V電壓。

一般認(ren)為將鋰電(dian)(dian)(dian)(dian)池(chi)(chi)的(de)空載電(dian)(dian)(dian)(dian)壓(ya)充(chong)到(dao)4.2V就認(ren)為電(dian)(dian)(dian)(dian)充(chong)滿了，電(dian)(dian)(dian)(dian)池(chi)(chi)充(chong)電(dian)(dian)(dian)(dian)過程中,電(dian)(dian)(dian)(dian)池(chi)(chi)的(de)電(dian)(dian)(dian)(dian)壓(ya)在3.7V逐(zhu)漸(jian)上升到(dao)4.2V，鋰電(dian)(dian)(dian)(dian)池(chi)(chi)充(chong)電(dian)(dian)(dian)(dian)不能將空載電(dian)(dian)(dian)(dian)壓(ya)充(chong)到(dao)4.2V以上的(de)，否則也會損害(hai)電(dian)(dian)(dian)(dian)池(chi)(chi)，這就是鋰電(dian)(dian)(dian)(dian)池(chi)(chi)特殊的(de)地方。

鋰離子電池充電(dian)過程分為恒流(liu)快(kuai)充階段(duan)(duan)和恒壓電(dian)流(liu)下降階段(duan)(duan)。恒流(liu)快(kuai)速充電(dian)階段(duan)(duan)，電(dian)池電(dian)壓逐漸(jian)上升(sheng)至電(dian)池標準(zhun)電(dian)壓，然后在控(kong)(kong)制(zhi)(zhi)芯(xin)片(pian)的控(kong)(kong)制(zhi)(zhi)下進入恒壓階段(duan)(duan)。電(dian)量統計(ji)芯(xin)片(pian)通過對放電(dian)曲(qu)線的記錄，可以對電(dian)池進行采樣計(ji)算。鋰(li)離(li)子(zi)電(dian)池使用次數多了，放電(dian)曲(qu)線就會發(fa)生變化，雖然鋰(li)離(li)子(zi)電(dian)池沒(mei)有記憶效應，但如果充電(dian)不當，會對電(dian)池的性(xing)能造成(cheng)很大的影響。

二、18650鋰電池充不進電怎么修復

造成18650充不(bu)(bu)進電的原因有電池的電極觸(chu)點生銹或(huo)是不(bu)(bu)干凈，導致接觸(chu)電阻(zu)太大造成壓降太大，使(shi)得(de)充電時充電裝置認為已經充滿(man)電而(er)對(dui)其停止充電，這(zhe)種情況只(zhi)需要將(jiang)電極觸(chu)電進行(xing)清潔即可。

排(pai)除(chu)電池本身問(wen)題的(de)情況下(xia)(xia)，檢查(cha)是(shi)否(fou)是(shi)充(chong)(chong)(chong)電器或(huo)是(shi)充(chong)(chong)(chong)電線存在問(wen)題，如(ru)果有其他充(chong)(chong)(chong)電設(she)備可以更(geng)換一(yi)下(xia)(xia)試試，因(yin)為(wei)充(chong)(chong)(chong)電器和線出現故障(zhang)也(ye)會引起18650充(chong)(chong)(chong)不進電。

如(ru)果是內部電(dian)(dian)(dian)(dian)路、電(dian)(dian)(dian)(dian)池(chi)本身以及(ji)電(dian)(dian)(dian)(dian)池(chi)壽命問題導致充不進電(dian)(dian)(dian)(dian)，建(jian)議直接(jie)更(geng)換電(dian)(dian)(dian)(dian)池(chi)。如(ru)果你(ni)非要(yao)拆解(jie)18650電(dian)(dian)(dian)(dian)池(chi)的話，要(yao)把(ba)電(dian)(dian)(dian)(dian)池(chi)中的電(dian)(dian)(dian)(dian)全(quan)部放(fang)掉，不過強烈建(jian)議不要(yao)進行這樣的操(cao)作。