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(ya)(ya)一般都在(zai)3.6V、3.8V和4.2V，遠高于鎳(nie)鎘和鎳(nie)氫電池的1.2V電壓(ya)(ya)。

一(yi)般認為(wei)將(jiang)鋰電(dian)(dian)池(chi)的(de)(de)空載電(dian)(dian)壓(ya)充(chong)(chong)到4.2V就認為(wei)電(dian)(dian)充(chong)(chong)滿了，電(dian)(dian)池(chi)充(chong)(chong)電(dian)(dian)過(guo)程中(zhong),電(dian)(dian)池(chi)的(de)(de)電(dian)(dian)壓(ya)在(zai)3.7V逐漸上(shang)升到4.2V，鋰電(dian)(dian)池(chi)充(chong)(chong)電(dian)(dian)不(bu)能將(jiang)空載電(dian)(dian)壓(ya)充(chong)(chong)到4.2V以上(shang)的(de)(de)，否則(ze)也會(hui)損害電(dian)(dian)池(chi)，這就是(shi)鋰電(dian)(dian)池(chi)特殊的(de)(de)地方。

鋰離子電池充電(dian)(dian)(dian)過程分為恒(heng)(heng)流(liu)快充階(jie)段(duan)和恒(heng)(heng)壓(ya)電(dian)(dian)(dian)流(liu)下(xia)降階(jie)段(duan)。恒(heng)(heng)流(liu)快速充電(dian)(dian)(dian)階(jie)段(duan)，電(dian)(dian)(dian)池(chi)電(dian)(dian)(dian)壓(ya)逐漸(jian)上升至電(dian)(dian)(dian)池(chi)標準電(dian)(dian)(dian)壓(ya)，然(ran)后在控制芯(xin)片的控制下(xia)進入恒(heng)(heng)壓(ya)階(jie)段(duan)。電(dian)(dian)(dian)量統計(ji)(ji)芯(xin)片通過對(dui)放電(dian)(dian)(dian)曲(qu)線的記錄(lu)，可以對(dui)電(dian)(dian)(dian)池(chi)進行(xing)采樣計(ji)(ji)算。鋰(li)離(li)子(zi)電(dian)(dian)(dian)池(chi)使用次數多了，放電(dian)(dian)(dian)曲(qu)線就會發生變化，雖然(ran)鋰(li)離(li)子(zi)電(dian)(dian)(dian)池(chi)沒有記憶效應，但如果充電(dian)(dian)(dian)不(bu)當，會對(dui)電(dian)(dian)(dian)池(chi)的性能造成(cheng)很大的影響。

二、18650鋰電池充不進電怎么修復

造成18650充(chong)(chong)(chong)(chong)不進(jin)電(dian)的原因有(you)電(dian)池的電(dian)極觸(chu)點生銹或是(shi)不干(gan)凈，導致接(jie)觸(chu)電(dian)阻(zu)太(tai)大造成壓(ya)降(jiang)太(tai)大，使得充(chong)(chong)(chong)(chong)電(dian)時充(chong)(chong)(chong)(chong)電(dian)裝置認為已經充(chong)(chong)(chong)(chong)滿(man)電(dian)而對其停止充(chong)(chong)(chong)(chong)電(dian)，這種(zhong)情況只需要將電(dian)極觸(chu)電(dian)進(jin)行清潔(jie)即可(ke)。

排(pai)除電(dian)池本身問(wen)題的情況(kuang)下，檢查是否是充(chong)電(dian)器或是充(chong)電(dian)線存(cun)在問(wen)題，如果(guo)有其他充(chong)電(dian)設備可以更換一下試試，因(yin)為充(chong)電(dian)器和線出現(xian)故障也會引起18650充(chong)不進電(dian)。

如果(guo)是(shi)內部電路(lu)、電池本(ben)身以及電池壽命問題導(dao)致充不進電，建(jian)議直接更(geng)換(huan)電池。如果(guo)你非(fei)要(yao)拆解18650電池的話，要(yao)把電池中的電全部放掉，不過強烈建(jian)議不要(yao)進行這樣的操作。