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)壓(ya)一般都在3.6V、3.8V和4.2V，遠(yuan)高(gao)于鎳鎘和鎳氫(qing)電(dian)池的1.2V電(dian)壓(ya)。

一般認(ren)為將(jiang)鋰(li)電(dian)(dian)(dian)池的(de)(de)空載(zai)電(dian)(dian)(dian)壓充到(dao)(dao)4.2V就認(ren)為電(dian)(dian)(dian)充滿了，電(dian)(dian)(dian)池充電(dian)(dian)(dian)過程中,電(dian)(dian)(dian)池的(de)(de)電(dian)(dian)(dian)壓在3.7V逐(zhu)漸上(shang)升到(dao)(dao)4.2V，鋰(li)電(dian)(dian)(dian)池充電(dian)(dian)(dian)不能將(jiang)空載(zai)電(dian)(dian)(dian)壓充到(dao)(dao)4.2V以上(shang)的(de)(de)，否則也(ye)會損害電(dian)(dian)(dian)池，這就是鋰(li)電(dian)(dian)(dian)池特殊的(de)(de)地(di)方。

鋰離子電池充(chong)電(dian)過程(cheng)分(fen)為恒(heng)(heng)流快(kuai)充(chong)階(jie)(jie)段和(he)恒(heng)(heng)壓(ya)(ya)電(dian)流下降階(jie)(jie)段。恒(heng)(heng)流快(kuai)速(su)充(chong)電(dian)階(jie)(jie)段，電(dian)池(chi)電(dian)壓(ya)(ya)逐(zhu)漸上升至電(dian)池(chi)標準電(dian)壓(ya)(ya)，然(ran)后在控制(zhi)芯片(pian)的(de)控制(zhi)下進入恒(heng)(heng)壓(ya)(ya)階(jie)(jie)段。電(dian)量統計芯片(pian)通(tong)過對(dui)放(fang)電(dian)曲線的(de)記錄，可(ke)以對(dui)電(dian)池(chi)進行采樣計算。鋰(li)離(li)子電(dian)池(chi)使用次數(shu)多了(le)，放(fang)電(dian)曲線就會發(fa)生變化，雖然(ran)鋰(li)離(li)子電(dian)池(chi)沒有記憶效應，但如果充(chong)電(dian)不當(dang)，會對(dui)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(zao)成(cheng)18650充(chong)不(bu)進(jin)電(dian)(dian)的(de)原因有電(dian)(dian)池的(de)電(dian)(dian)極觸(chu)(chu)(chu)點生銹或是不(bu)干凈，導致接(jie)觸(chu)(chu)(chu)電(dian)(dian)阻太大造(zao)成(cheng)壓降太大，使(shi)得充(chong)電(dian)(dian)時充(chong)電(dian)(dian)裝置認為(wei)已經充(chong)滿電(dian)(dian)而對(dui)其停止充(chong)電(dian)(dian)，這種情況只需要將電(dian)(dian)極觸(chu)(chu)(chu)電(dian)(dian)進(jin)行清潔(jie)即可(ke)。

排除電(dian)(dian)池本身問題的情況下，檢查是(shi)否是(shi)充電(dian)(dian)器(qi)或是(shi)充電(dian)(dian)線(xian)存在問題，如果(guo)有(you)其(qi)他充電(dian)(dian)設備(bei)可以更換一下試(shi)(shi)試(shi)(shi)，因為充電(dian)(dian)器(qi)和線(xian)出現故障也會引起18650充不進(jin)電(dian)(dian)。

如(ru)果是內部(bu)電(dian)(dian)路(lu)、電(dian)(dian)池本身以及電(dian)(dian)池壽命問題導致充(chong)不進(jin)電(dian)(dian)，建(jian)議直(zhi)接(jie)更換電(dian)(dian)池。如(ru)果你非要拆解18650電(dian)(dian)池的(de)話，要把(ba)電(dian)(dian)池中(zhong)的(de)電(dian)(dian)全部(bu)放掉，不過(guo)強烈(lie)建(jian)議不要進(jin)行這樣的(de)操作。