大家在購買或者了解鋰電池的(de)時候，經常看到鋰(li)電池有說3.7V的(de)，也有說4.2V的(de)，這個到底是怎么(me)回事呢？鋰(li)電池電壓3.7V和4.2V有什么(me)區別？下(xia)面小編(bian)就對這個做簡(jian)單的(de)介紹吧。

鋰電(dian)池電(dian)壓3.7V和4.2V分別表示(shi)的意(yi)思是，3.7V表示(shi)的是額定電(dian)壓參數的意(yi)思，而4.2V是表示(shi)額定工作電(dian)壓參數的意(yi)思。電(dian)壓不同功率會不同。

常說的鋰電(dian)池3.7V與4.2V電(dian)壓(ya)有什么不同？

鋰電池電壓(ya)標(biao)3.7V或4.2V，是一(yi)回事。只是生產廠商(shang)標(biao)注(zhu)的不一(yi)樣而己。

3.7V指(zhi)(zhi)鋰(li)電(dian)(dian)(dian)池使用(yong)(yong)過(guo)程中放電(dian)(dian)(dian)的平(ping)臺電(dian)(dian)(dian)壓(ya)，而4.2伏指(zhi)(zhi)的是(shi)(shi)充電(dian)(dian)(dian)滿電(dian)(dian)(dian)時(shi)(shi)的電(dian)(dian)(dian)壓(ya)。常(chang)見的可(ke)充18650鋰(li)電(dian)(dian)(dian)池，電(dian)(dian)(dian)壓(ya)都是(shi)(shi)標3.6或者3.7v,充滿電(dian)(dian)(dian)的時(shi)(shi)候是(shi)(shi)4.2v，這跟電(dian)(dian)(dian)量(liang)（容量(liang)）關系不大(da)，18650電(dian)(dian)(dian)池從1200mah到4000mah，3.7V是(shi)(shi)指(zhi)(zhi)電(dian)(dian)(dian)池電(dian)(dian)(dian)用(yong)(yong)完時(shi)(shi)的最(zui)低電(dian)(dian)(dian)壓(ya)。

一般認為(wei)將鋰(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)(chi)的空(kong)載電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓放到(dao)3.7V就認為(wei)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)用完了，鋰(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)(chi)放電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)不(bu)能(neng)將空(kong)載電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓放到(dao)3.7V以下(xia)的，否則(ze)會損害電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)(chi)，4.2V是電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)(chi)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)的最高(gao)限制電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓,一般認為(wei)將鋰(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)(chi)的空(kong)載電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓充(chong)到(dao)4.2V就認為(wei)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)充(chong)滿(man)了，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)(chi)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)過(guo)程中(zhong),電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)(chi)的電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓在3.7V逐(zhu)漸(jian)上(shang)升到(dao)4.2V，鋰(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)(chi)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)不(bu)能(neng)將空(kong)載電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓充(chong)到(dao)4.2V以上(shang)的，否則(ze)也會損害電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)(chi)。

3.7V與4.2V電(dian)壓的說(shuo)法從理論上來(lai)說(shuo)沒(mei)什么區(qu)別(bie)。

1、如(ru)果按照嚴格標準來說，一個是3.7V額定(ding)電(dian)壓(ya)(ya)參(can)數(shu)，一個是4.2V額定(ding)工(gong)作(zuo)電(dian)壓(ya)(ya)參(can)數(shu)，這是有區(qu)別的。

2、行業中，工(gong)廠(chang)與工(gong)廠(chang)之間(jian)標(biao)準(zhun)不一，有(you)時(shi)會標(biao)最(zui)(zui)大工(gong)作(zuo)電(dian)(dian)(dian)壓，有(you)時(shi)會標(biao)最(zui)(zui)低工(gong)作(zuo)電(dian)(dian)(dian)壓，而鋰電(dian)(dian)(dian)池(chi)的最(zui)(zui)低工(gong)作(zuo)電(dian)(dian)(dian)壓在3.2V左(zuo)右(you)，最(zui)(zui)高在4.5V左(zuo)右(you)，所以3.7/4.2都(dou)是(shi)在工(gong)作(zuo)電(dian)(dian)(dian)壓參數之間(jian)，無(wu)實際性功能(neng)區別。

一般3.7V鋰電(dian)(dian)池需要(yao)有(you)過充和(he)過放的”保(bao)護(hu)板(ban)”，如電(dian)(dian)池沒有(you)保(bao)護(hu)板(ban)就只(zhi)有(you)用約(yue)4.2V的充電(dian)(dian)壓(ya)，因(yin)為鋰電(dian)(dian)池理想滿充電(dian)(dian)壓(ya)是4.2V，電(dian)(dian)壓(ya)超過4.2V就可能損壞電(dian)(dian)池，用這方法充電(dian)(dian)同時需要(yao)時刻監察電(dian)(dian)池的狀況。

一般的(de)都是3.7鋰電(dian)(dian)(dian)池(chi)(chi)，3.7V鋰電(dian)(dian)(dian)池(chi)(chi)在放電(dian)(dian)(dian)是電(dian)(dian)(dian)壓(ya)會下降(jiang)，一般會從4.2V下降(jiang)到(dao)3.0V左(zuo)右，所以電(dian)(dian)(dian)池(chi)(chi)上標(biao)的(de)電(dian)(dian)(dian)壓(ya)不是穩定輸出電(dian)(dian)(dian)壓(ya)。鋰電(dian)(dian)(dian)池(chi)(chi)的(de)標(biao)準(zhun)電(dian)(dian)(dian)壓(ya)都是7.4V左(zuo)右，所以3.7V和3.8V沒什么區(qu)別，就是3.8V充電(dian)(dian)(dian)可能更(geng)足一點。

由于(yu)電(dian)池會自放電(dian)，放愈(yu)久電(dian)壓會愈(yu)低，因此，放電(dian)時最好不要放到(dao)2.4V才(cai)停止。鋰電(dian)池從3.0V放電(dian)到(dao)2.4V這段期間，所釋(shi)放的(de)能量(liang)只占電(dian)池容量(liang)的(de)3%左右。

以上就是關于網上說(shuo)的(de)3.7V與4.2V電(dian)壓有(you)什么不同(tong)的(de)詳細介紹，如(ru)有(you)補充(chong)，歡迎(ying)留言！