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(dou)在(zai)3.6V、3.8V和(he)4.2V，遠高于(yu)鎳鎘和(he)鎳氫電池的1.2V電壓。

一(yi)般認(ren)為將鋰(li)電池(chi)(chi)(chi)的空(kong)(kong)載(zai)電壓(ya)(ya)充(chong)到4.2V就認(ren)為電充(chong)滿了(le)，電池(chi)(chi)(chi)充(chong)電過程中(zhong),電池(chi)(chi)(chi)的電壓(ya)(ya)在3.7V逐(zhu)漸上(shang)升到4.2V，鋰(li)電池(chi)(chi)(chi)充(chong)電不能將空(kong)(kong)載(zai)電壓(ya)(ya)充(chong)到4.2V以上(shang)的，否則(ze)也會損害(hai)電池(chi)(chi)(chi)，這就是(shi)鋰(li)電池(chi)(chi)(chi)特殊的地(di)方。

鋰離子電池充(chong)電(dian)(dian)(dian)過程分(fen)為恒流快充(chong)階(jie)段和恒壓電(dian)(dian)(dian)流下(xia)降階(jie)段。恒流快速(su)充(chong)電(dian)(dian)(dian)階(jie)段，電(dian)(dian)(dian)池電(dian)(dian)(dian)壓逐漸(jian)上升至電(dian)(dian)(dian)池標準電(dian)(dian)(dian)壓，然(ran)后在控(kong)(kong)制芯片的(de)(de)控(kong)(kong)制下(xia)進入恒壓階(jie)段。電(dian)(dian)(dian)量統計芯片通過對放電(dian)(dian)(dian)曲線(xian)的(de)(de)記(ji)錄，可(ke)以對電(dian)(dian)(dian)池進行采樣計算。鋰離子電(dian)(dian)(dian)池使用次數多了，放電(dian)(dian)(dian)曲線(xian)就會(hui)發生變化，雖然(ran)鋰離子電(dian)(dian)(dian)池沒有(you)記(ji)憶(yi)效應，但(dan)如果充(chong)電(dian)(dian)(dian)不當，會(hui)對電(dian)(dian)(dian)池的(de)(de)性(xing)能造成很(hen)大(da)的(de)(de)影響(xiang)。

二、18650鋰電池充不進電怎么修復

造(zao)成18650充(chong)不進電(dian)的(de)原因有電(dian)池(chi)的(de)電(dian)極觸點生銹或是不干凈，導致接(jie)觸電(dian)阻(zu)太大造(zao)成壓(ya)降(jiang)太大，使得(de)充(chong)電(dian)時(shi)充(chong)電(dian)裝置認為已經充(chong)滿電(dian)而對其停止充(chong)電(dian)，這種(zhong)情況只(zhi)需要將電(dian)極觸電(dian)進行清潔即可。

排除電(dian)(dian)池本身問題(ti)的情況下，檢查是(shi)否是(shi)充電(dian)(dian)器(qi)或是(shi)充電(dian)(dian)線存在(zai)問題(ti)，如果有其他充電(dian)(dian)設(she)備(bei)可以更換一(yi)下試(shi)試(shi)，因為充電(dian)(dian)器(qi)和線出(chu)現故障也(ye)會引(yin)起18650充不進電(dian)(dian)。

如(ru)果是(shi)內部電路、電池(chi)本身以(yi)及電池(chi)壽命問題(ti)導致(zhi)充不進電，建議(yi)直接更換(huan)電池(chi)。如(ru)果你非要(yao)拆解18650電池(chi)的(de)話，要(yao)把電池(chi)中的(de)電全部放(fang)掉，不過(guo)強烈建議(yi)不要(yao)進行這樣的(de)操作(zuo)。