相信很多朋友會認為電池電壓越高，電池電量就越大吧，這是對的嗎？鋰電池電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)與(yu)電(dian)(dian)(dian)(dian)(dian)(dian)量(liang)有什么(me)關系是怎么(me)樣(yang)的(de)呢？同(tong)一個電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)，在同(tong)等剩余容(rong)(rong)量(liang)的(de)情(qing)況下(xia)，電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)值(zhi)因放(fang)(fang)電(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)流的(de)大(da)小而變(bian)化(hua)(hua)。放(fang)(fang)電(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)流越大(da)，電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)越低。在沒有電(dian)(dian)(dian)(dian)(dian)(dian)流的(de)情(qing)況下(xia)，電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)最高；環(huan)境溫度對(dui)鋰(li)電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)的(de)影(ying)響，溫度越低，同(tong)等容(rong)(rong)量(liang)電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)越低；循環(huan)對(dui)電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)放(fang)(fang)電(dian)(dian)(dian)(dian)(dian)(dian)平(ping)(ping)臺(tai)的(de)影(ying)響，隨著循環(huan)的(de)進行(xing)，鋰(li)電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)的(de)放(fang)(fang)電(dian)(dian)(dian)(dian)(dian)(dian)平(ping)(ping)臺(tai)趨于惡化(hua)(hua)。放(fang)(fang)電(dian)(dian)(dian)(dian)(dian)(dian)平(ping)(ping)臺(tai)降(jiang)低。所(suo)以相同(tong)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)所(suo)代表的(de)容(rong)(rong)量(liang)也相應變(bian)化(hua)(hua)了(le)；不(bu)同(tong)廠家，不(bu)同(tong)容(rong)(rong)量(liang)的(de)鋰(li)離子電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)，其放(fang)(fang)電(dian)(dian)(dian)(dian)(dian)(dian)的(de)平(ping)(ping)臺(tai)略(lve)有差異。

說了這么多(duo)，下面給出一個標準的鋰電池電壓與電量的關系(xi)數據以及大電流恒流放(fang)電是電池電壓對容量的表(biao)格。

100%—-4.20V100%—-4.20V

90%—–4.06V90%—–3.97V

80%—–3.98V80%—–3.87V

70%—–3.92V70%—–3.79V

60%—–3.87V60%—–3.73V

50%—–3.82V50%—–3.68V

40%—–3.79V40%—–3.65V

30%—–3.77V30%—–3.62V

20%—–3.74V20%—–3.58V

10%—–3.68V10%—–3.51V

5%——3.45V5%——3.42V

0%——3.00V0%——3.00V

鋰電(dian)(dian)池電(dian)(dian)壓與電(dian)(dian)量(liang)的(de)關系(xi)中(zhong)，電(dian)(dian)壓會(hui)隨著(zhu)電(dian)(dian)量(liang)的(de)減少而下降，這(zhe)個原因是什么？

鋰電(dian)(dian)池電(dian)(dian)壓隨電(dian)(dian)量下降而下降的(de)原(yuan)因，除(chu)了(le)電(dian)(dian)池兩端化(hua)(hua)(hua)學勢的(de)變化(hua)(hua)(hua)之(zhi)(zhi)外，還有一部分是離子和(he)電(dian)(dian)荷的(de)轉移(yi)所產生的(de)極化(hua)(hua)(hua)。在放電(dian)(dian)初期因為電(dian)(dian)極和(he)電(dian)(dian)解液(ye)之(zhi)(zhi)間的(de)反應而產生的(de)活(huo)化(hua)(hua)(hua)極化(hua)(hua)(hua)，這個(ge)極化(hua)(hua)(hua)大小可以通過(guo)Tafel方程計算,，與氧化(hua)(hua)(hua)還原(yuan)反應速率和(he)各(ge)個(ge)反應物之(zhi)(zhi)間的(de)活(huo)性相關(guan)。

到放(fang)電(dian)末期，因為電(dian)極(ji)本身離(li)子擴散速度(du)的限(xian)制，在電(dian)極(ji)表面和電(dian)極(ji)內(nei)部會產生(sheng)(sheng)一個濃(nong)度(du)差(cha)(cha)，從而產生(sheng)(sheng)所謂濃(nong)差(cha)(cha)極(ji)化。

鋰電池的(de)電量(liang)保持(chi)在多(duo)少(shao)最有益？

鋰電(dian)池(chi)的(de)電(dian)量保持在(zai)40%-60%之(zhi)間(jian)是(shi)最(zui)好的(de)。鋰電(dian)池(chi)一般(ban)出廠(chang)容量在(zai)50%左右，這是(shi)電(dian)池(chi)廠(chang)經(jing)過(guo)了(le)實驗(yan)驗(yan)證(zheng)了(le)的(de)最(zui)好的(de)存儲容量。根據大部分的(de)電(dian)池(chi)廠(chang)的(de)實測數據，帶50%的(de)電(dian)量出貨，能(neng)保證(zheng)其存放一年(nian)時間(jian)以(yi)上(shang)(shang)，電(dian)壓(ya)還(huan)在(zai)3.2V以(yi)上(shang)(shang)，恢復容量在(zai)98%以(yi)上(shang)(shang)。

由于(yu)各個鋰電(dian)(dian)(dian)池廠家的(de)(de)市(shi)場定位不(bu)一樣，技(ji)術工藝(yi)手段不(bu)同(tong)，其控制的(de)(de)放電(dian)(dian)(dian)平臺就(jiu)不(bu)一樣，質(zhi)量(liang)也就(jiu)有很大(da)差別(bie)。另外鋰電(dian)(dian)(dian)池的(de)(de)開路(lu)電(dian)(dian)(dian)壓(ya)與電(dian)(dian)(dian)池的(de)(de)荷電(dian)(dian)(dian)量(liang)有明確單調的(de)(de)對應關(guan)系,只要獲得準確的(de)(de)開路(lu)電(dian)(dian)(dian)壓(ya)就(jiu)可以(yi)推(tui)算(suan)出電(dian)(dian)(dian)池電(dian)(dian)(dian)量(liang)。