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(yi)般都在3.6V、3.8V和(he)4.2V，遠高于鎳(nie)鎘和(he)鎳(nie)氫電池的1.2V電壓。

一般認為(wei)將鋰電(dian)(dian)(dian)池(chi)的空載電(dian)(dian)(dian)壓充(chong)到4.2V就認為(wei)電(dian)(dian)(dian)充(chong)滿了，電(dian)(dian)(dian)池(chi)充(chong)電(dian)(dian)(dian)過程中,電(dian)(dian)(dian)池(chi)的電(dian)(dian)(dian)壓在3.7V逐(zhu)漸上升到4.2V，鋰電(dian)(dian)(dian)池(chi)充(chong)電(dian)(dian)(dian)不能將空載電(dian)(dian)(dian)壓充(chong)到4.2V以上的，否則也會損(sun)害電(dian)(dian)(dian)池(chi)，這就是鋰電(dian)(dian)(dian)池(chi)特(te)殊的地方(fang)。

鋰離子電池充(chong)電(dian)(dian)過程分為恒(heng)(heng)流(liu)(liu)快充(chong)階(jie)段(duan)和恒(heng)(heng)壓(ya)電(dian)(dian)流(liu)(liu)下(xia)降階(jie)段(duan)。恒(heng)(heng)流(liu)(liu)快速充(chong)電(dian)(dian)階(jie)段(duan)，電(dian)(dian)池(chi)(chi)電(dian)(dian)壓(ya)逐漸上升(sheng)至電(dian)(dian)池(chi)(chi)標(biao)準電(dian)(dian)壓(ya)，然(ran)后(hou)在控制芯(xin)片的(de)(de)控制下(xia)進(jin)入恒(heng)(heng)壓(ya)階(jie)段(duan)。電(dian)(dian)量統計(ji)芯(xin)片通過對(dui)放電(dian)(dian)曲(qu)線(xian)的(de)(de)記錄(lu)，可以對(dui)電(dian)(dian)池(chi)(chi)進(jin)行(xing)采樣(yang)計(ji)算。鋰離(li)子(zi)電(dian)(dian)池(chi)(chi)使用次數多了，放電(dian)(dian)曲(qu)線(xian)就會(hui)發生變化，雖然(ran)鋰離(li)子(zi)電(dian)(dian)池(chi)(chi)沒有記憶效應，但如果充(chong)電(dian)(dian)不當，會(hui)對(dui)電(dian)(dian)池(chi)(chi)的(de)(de)性能(neng)造成很(hen)大的(de)(de)影響。

二、18650鋰電池充不進電怎么修復

造成(cheng)(cheng)18650充不進(jin)電(dian)(dian)的(de)(de)原因(yin)有電(dian)(dian)池的(de)(de)電(dian)(dian)極觸點生銹或是不干凈(jing)，導致接觸電(dian)(dian)阻太(tai)大造成(cheng)(cheng)壓降太(tai)大，使得充電(dian)(dian)時充電(dian)(dian)裝置(zhi)認(ren)為已經充滿電(dian)(dian)而對其(qi)停(ting)止充電(dian)(dian)，這種情(qing)況只需要將電(dian)(dian)極觸電(dian)(dian)進(jin)行清(qing)潔即可。

排除電(dian)(dian)池本身(shen)問題(ti)的情(qing)況(kuang)下(xia)，檢(jian)查是(shi)否是(shi)充(chong)(chong)(chong)電(dian)(dian)器或是(shi)充(chong)(chong)(chong)電(dian)(dian)線存在(zai)問題(ti)，如果有(you)其他充(chong)(chong)(chong)電(dian)(dian)設備可以更換一(yi)下(xia)試試，因(yin)為充(chong)(chong)(chong)電(dian)(dian)器和線出(chu)現故障也會引(yin)起18650充(chong)(chong)(chong)不進電(dian)(dian)。

如果是內部電(dian)(dian)路、電(dian)(dian)池(chi)本身以及電(dian)(dian)池(chi)壽命(ming)問題(ti)導致(zhi)充不進(jin)電(dian)(dian)，建議(yi)直接更換(huan)電(dian)(dian)池(chi)。如果你非(fei)要(yao)拆(chai)解18650電(dian)(dian)池(chi)的話(hua)，要(yao)把電(dian)(dian)池(chi)中的電(dian)(dian)全部放掉，不過強(qiang)烈建議(yi)不要(yao)進(jin)行這樣的操作。