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)壓一般(ban)都在3.6V、3.8V和4.2V，遠高于鎳(nie)鎘和鎳(nie)氫電(dian)池(chi)的1.2V電(dian)壓。

一(yi)般認為將鋰電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)的(de)空載(zai)電(dian)(dian)(dian)(dian)(dian)壓充到(dao)4.2V就認為電(dian)(dian)(dian)(dian)(dian)充滿了，電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)充電(dian)(dian)(dian)(dian)(dian)過程(cheng)中,電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)的(de)電(dian)(dian)(dian)(dian)(dian)壓在3.7V逐漸上升到(dao)4.2V，鋰電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)充電(dian)(dian)(dian)(dian)(dian)不能將空載(zai)電(dian)(dian)(dian)(dian)(dian)壓充到(dao)4.2V以上的(de)，否則也會(hui)損害電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)，這就是鋰電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)特殊的(de)地方。

鋰離子電池充電(dian)(dian)(dian)過程分為恒(heng)流(liu)快(kuai)充階段(duan)和(he)恒(heng)壓電(dian)(dian)(dian)流(liu)下降階段(duan)。恒(heng)流(liu)快(kuai)速充電(dian)(dian)(dian)階段(duan)，電(dian)(dian)(dian)池(chi)電(dian)(dian)(dian)壓逐漸上升至電(dian)(dian)(dian)池(chi)標準電(dian)(dian)(dian)壓，然(ran)后在控(kong)制芯(xin)片的(de)(de)控(kong)制下進(jin)入恒(heng)壓階段(duan)。電(dian)(dian)(dian)量統計芯(xin)片通過對(dui)(dui)放電(dian)(dian)(dian)曲(qu)(qu)線的(de)(de)記錄，可以對(dui)(dui)電(dian)(dian)(dian)池(chi)進(jin)行(xing)采樣計算。鋰離(li)(li)子電(dian)(dian)(dian)池(chi)使用次數多(duo)了(le)，放電(dian)(dian)(dian)曲(qu)(qu)線就(jiu)會發生(sheng)變化(hua)，雖然(ran)鋰離(li)(li)子電(dian)(dian)(dian)池(chi)沒(mei)有(you)記憶效應，但如果充電(dian)(dian)(dian)不當，會對(dui)(dui)電(dian)(dian)(dian)池(chi)的(de)(de)性能造成(cheng)很大的(de)(de)影響。

二、18650鋰電池充不進電怎么修復

造成(cheng)18650充不(bu)進電(dian)(dian)的(de)原因有電(dian)(dian)池的(de)電(dian)(dian)極(ji)觸點(dian)生銹或是不(bu)干凈，導(dao)致接觸電(dian)(dian)阻太大(da)造成(cheng)壓(ya)降太大(da)，使得充電(dian)(dian)時(shi)充電(dian)(dian)裝(zhuang)置認為已經充滿電(dian)(dian)而對其停止充電(dian)(dian)，這種情(qing)況(kuang)只需要將(jiang)電(dian)(dian)極(ji)觸電(dian)(dian)進行清潔(jie)即可。

排除電(dian)(dian)(dian)池本身問(wen)(wen)題的情況下(xia)，檢(jian)查是(shi)否(fou)是(shi)充(chong)(chong)電(dian)(dian)(dian)器或是(shi)充(chong)(chong)電(dian)(dian)(dian)線(xian)存在問(wen)(wen)題，如果有其(qi)他充(chong)(chong)電(dian)(dian)(dian)設(she)備可(ke)以更換一下(xia)試試，因為充(chong)(chong)電(dian)(dian)(dian)器和線(xian)出現故障也(ye)會引(yin)起18650充(chong)(chong)不進電(dian)(dian)(dian)。

如果(guo)是內部(bu)電(dian)路、電(dian)池(chi)本身以及電(dian)池(chi)壽命問題導致(zhi)充不(bu)進(jin)電(dian)，建議(yi)(yi)直接更換電(dian)池(chi)。如果(guo)你非(fei)要拆解18650電(dian)池(chi)的話，要把電(dian)池(chi)中的電(dian)全部(bu)放(fang)掉，不(bu)過強(qiang)烈建議(yi)(yi)不(bu)要進(jin)行這樣(yang)的操作。