鋰電池充電電流多大合適？這個沒有統一的標準，而是要看是什么類型的鋰電池和是否支持快充技術，這樣之后才能知道鋰電池充電電流多大比較合適。知道了鋰電池的類型和屬性后，那么鋰電池充電電流如何計算?這是由鋰電池本身的化學物質決定的。所以需要根據鋰電池本身的充電特性來配置充電IC的性能，以達到正確，安全，高效的使用鋰電池。

鋰(li)電(dian)池充(chong)電(dian)電(dian)流(liu)大(da)小根(gen)據(ju)容(rong)量(liang)來定。電(dian)流(liu)越大(da)，電(dian)池越不容(rong)易充(chong)滿。這(zhe)樣做都(dou)是為(wei)了保(bao)護鋰(li)電(dian)池可以正常使(shi)用(yong),因為(wei)過充(chong)和過放都(dou)會(hui)導致鋰(li)電(dian)池漏液或者(zhe)功能失(shi)效,甚(shen)至爆炸(zha)。

鋰(li)電(dian)池(chi)在充(chong)(chong)電(dian)過(guo)程(cheng)(cheng)中所處快速充(chong)(chong)電(dian)階(jie)段的充(chong)(chong)電(dian)電(dian)流而言的，作(zuo)為一個動(dong)態的過(guo)程(cheng)(cheng)，鋰(li)電(dian)池(chi)最(zui)佳(jia)充(chong)(chong)電(dian)電(dian)流實(shi)際上是分為三個階(jie)段的。

1、預(yu)(yu)充(chong)(chong)電(dian)(dian)時(shi)的最佳電(dian)(dian)流(liu)(liu)：即當鋰電(dian)(dian)池的初始/空載電(dian)(dian)壓(ya)低于預(yu)(yu)充(chong)(chong)電(dian)(dian)閾值(zhi)時(shi)，首先要經過一個(ge)(ge)預(yu)(yu)充(chong)(chong)電(dian)(dian)階段(duan)，就單(dan)個(ge)(ge)鋰離子電(dian)(dian)池而言，這個(ge)(ge)閾值(zhi)一般為(wei)3.0V，在(zai)此階段(duan)，預(yu)(yu)充(chong)(chong)電(dian)(dian)電(dian)(dian)流(liu)(liu)大約(yue)為(wei)下一個(ge)(ge)階段(duan)——恒(heng)流(liu)(liu)充(chong)(chong)電(dian)(dian)階段(duan)電(dian)(dian)流(liu)(liu)的10%左(zuo)右。

2、恒(heng)流(liu)充(chong)(chong)電(dian)(dian)時的最佳電(dian)(dian)流(liu)：所謂恒(heng)流(liu)就(jiu)是(shi)(shi)電(dian)(dian)流(liu)恒(heng)定，電(dian)(dian)壓(ya)逐漸升高，此(ci)時進(jin)入(ru)快速充(chong)(chong)電(dian)(dian)階段(duan)。大多(duo)數的恒(heng)流(liu)充(chong)(chong)電(dian)(dian)電(dian)(dian)流(liu)設(she)定為0.4~0.6C之間(jian)，可(ke)以(yi)(yi)理解(jie)為0.5C，也就(jiu)是(shi)(shi)在不(bu)考慮其他因(yin)素(su)的情況(kuang)下，大約兩個小時可(ke)以(yi)(yi)充(chong)(chong)滿。之所以(yi)(yi)選(xuan)擇0.5C，是(shi)(shi)因(yin)為這個電(dian)(dian)流(liu)很(hen)好地做到了(le)充(chong)(chong)電(dian)(dian)時間(jian)與充(chong)(chong)電(dian)(dian)安(an)全性(xing)的平(ping)衡。

3、恒壓(ya)(ya)充(chong)(chong)電(dian)(dian)(dian)時的(de)充(chong)(chong)電(dian)(dian)(dian)電(dian)(dian)(dian)流(liu)：就(jiu)單節鋰離(li)子電(dian)(dian)(dian)池而言，當電(dian)(dian)(dian)池達到一(yi)(yi)定電(dian)(dian)(dian)壓(ya)(ya)值時，即進入(ru)恒定電(dian)(dian)(dian)壓(ya)(ya)充(chong)(chong)電(dian)(dian)(dian)，這(zhe)個電(dian)(dian)(dian)壓(ya)(ya)值一(yi)(yi)般為(wei)4.2V，在此階(jie)段，電(dian)(dian)(dian)壓(ya)(ya)不變，電(dian)(dian)(dian)流(liu)減(jian)小；這(zhe)種電(dian)(dian)(dian)流(liu)減(jian)小是個依次(ci)遞減(jian)過(guo)程，大多數的(de)鋰電(dian)(dian)(dian)池保護選擇0.01C為(wei)終止電(dian)(dian)(dian)流(liu)，這(zhe)也就(jiu)意味著(zhu)充(chong)(chong)電(dian)(dian)(dian)過(guo)程進入(ru)結(jie)束狀態(tai)。一(yi)(yi)旦充(chong)(chong)電(dian)(dian)(dian)結(jie)束，則充(chong)(chong)電(dian)(dian)(dian)電(dian)(dian)(dian)流(liu)降為(wei)零(ling)。

鋰(li)電(dian)(dian)(dian)池(chi)(chi)最(zui)佳充(chong)電(dian)(dian)(dian)電(dian)(dian)(dian)流的(de)(de)核心是(shi)(shi)恒流充(chong)電(dian)(dian)(dian)時的(de)(de)電(dian)(dian)(dian)流設計，這里要強調的(de)(de)是(shi)(shi)，大多數便(bian)捷式鋰(li)電(dian)(dian)(dian)池(chi)(chi)較宜設計為(wei)0.5C充(chong)電(dian)(dian)(dian)，如，18650鋰(li)電(dian)(dian)(dian)池(chi)(chi)常規(gui)容量為(wei)1800-2600mAh，可(ke)選(xuan)擇(ze)1A充(chong)電(dian)(dian)(dian)，而倍率型的(de)(de)為(wei)1200-1500mAh，0.5C的(de)(de)充(chong)電(dian)(dian)(dian)電(dian)(dian)(dian)流就是(shi)(shi)0.7A。鋰(li)電(dian)(dian)(dian)池(chi)(chi)最(zui)大充(chong)電(dian)(dian)(dian)電(dian)(dian)(dian)流嚴格說是(shi)(shi)由電(dian)(dian)(dian)池(chi)(chi)結(jie)構(gou)決定的(de)(de)，因而，各個鋰(li)電(dian)(dian)(dian)池(chi)(chi)生產廠家對此規(gui)定并(bing)不一致，有的(de)(de)設定為(wei)0.6C，便(bian)攜(xie)式鋰(li)電(dian)(dian)(dian)池(chi)(chi)最(zui)高的(de)(de)規(gui)定為(wei)1C。

鋰電池充電電流如何計算?

鋰電(dian)(dian)(dian)池(chi)可以(yi)接受(shou)的(de)(de)最(zui)大(da)充(chong)(chong)電(dian)(dian)(dian)電(dian)(dian)(dian)流通(tong)(tong)常是1C甚至更小(xiao),鋰電(dian)(dian)(dian)池(chi)充(chong)(chong)電(dian)(dian)(dian)電(dian)(dian)(dian)流一(yi)般充(chong)(chong)電(dian)(dian)(dian)器上(shang)有(you)標注(zhu)的(de)(de)，你看一(yi)下，通(tong)(tong)常鋰電(dian)(dian)(dian)池(chi)采用(yong)的(de)(de)都(dou)是先恒(heng)流再恒(heng)壓(ya)的(de)(de)充(chong)(chong)電(dian)(dian)(dian)模式，當充(chong)(chong)到充(chong)(chong)電(dian)(dian)(dian)器限制電(dian)(dian)(dian)壓(ya)的(de)(de)時候，會進行涓(juan)涓(juan)細流充(chong)(chong)電(dian)(dian)(dian)，所以(yi)充(chong)(chong)電(dian)(dian)(dian)時間還要加(jia)上(shang)1個小(xiao)時左右如(ru)果要算充(chong)(chong)電(dian)(dian)(dian)時間，則用(yong)電(dian)(dian)(dian)池(chi)容量除以(yi)充(chong)(chong)電(dian)(dian)(dian)電(dian)(dian)(dian)流，加(jia)上(shang)轉換(huan)損耗，最(zui)后(hou)加(jia)上(shang)一(yi)個小(xiao)時就差不多(duo)了。

磷酸鐵鋰電池一般可以使用1C或更高（15C）的充放電電流，故比較適合做為動力電池。18650電池充電時間與所有二次電池充電時間的理論都是一樣的，即，電池充電時間等于標稱容量與充電電流之比，不過，由于鋰電池充電時內部會產生阻抗，所以，18650電池充電時間要考慮克服這種阻抗的因素。