關于電池在高溫和低溫下放電解決方案
通常情況下,電池在(zai)室溫(wen)下的功(gong)能(neng)最佳,溫(wen)度為(wei)27 ° C-(80 ° F)。在(zai)高溫(wen)下操作電(dian)池可提高性能(neng),但長時間暴露(lu)會縮短(duan)使用(yong)壽命(ming)。
正如寒冷國家(jia)的所有司機都(dou)知道的那樣,溫(wen)度(du)保持常(chang)(chang)溫(wen)的電(dian)(dian)池(chi)性能更好。低(di)溫(wen)會增(zeng)加內阻并降低(di)容(rong)量(liang)。一(yi)種(zhong)電(dian)(dian)池(chi),可(ke)在(zai)27小(xiao)時(shi)提供(gong)100%的容(rong)量(liang),通常(chang)(chang)在(zai)-18 ° C(0 ° F)到(dao)26° C(80 ° F)時(shi)僅提供(gong)50%。瞬間容(rong)量(liang)減少(shao)因電(dian)(dian)池(chi)化學性質(zhi)而(er)異。干固體(ti)聚(ju)合(he)物電(dian)(dian)池(chi)需要(yao)60-100°C(140-212 ° F)的溫(wen)度(du)來促進離子流(liu)動(dong)并變得導電(dian)(dian)。這種(zhong)類型(xing)的電(dian)(dian)池(chi)已經在(zai)炎(yan)熱氣候中為固定功率應用找到(dao)了(le)一(yi)個利基市場,其中熱量(liang)用作催化劑(ji)而(er)不是(shi)缺點(dian)。內置加熱元件可(ke)始終保持電(dian)(dian)池(chi)正常(chang)(chang)運行。高電(dian)(dian)池(chi)成本和安(an)全問題(ti)限制了(le)該(gai)系(xi)統的應用。更常(chang)(chang)見(jian)的鋰聚(ju)合(he)物使用凝(ning)膠電(dian)(dian)解質(zhi)來增(zeng)強(qiang)導電(dian)(dian)性。
如(ru)果(guo)在20°C(68°F)或略低于20°C的(de)溫(wen)度下使用(yong),所有(you)電(dian)池(chi)均可(ke)實現(xian)最佳(jia)使用(yong)壽(shou)命(ming)。例如(ru),如(ru)果(guo)電(dian)池(chi)工作(zuo)在30°C(86°F)而(er)不是更溫(wen)和的(de)較低室溫(wen),則循(xun)環(huan)壽(shou)命(ming)降低20%。在40°C(104°F)時,損耗(hao)躍升至高達(da)40%,如(ru)果(guo)在45°C(113°F)下充電(dian)和放(fang)電(dian),則循(xun)環(huan)壽(shou)命(ming)僅為20°時的(de)預期壽(shou)命(ming)的(de)一半。
所(suo)有電(dian)池的性能(neng)在(zai)低(di)溫下急(ji)劇(ju)下降(jiang)(jiang),然而,當(dang)施加(jia)負載電(dian)流時(shi),由于電(dian)壓降(jiang)(jiang)引起的效率(lv)損(sun)失,升高的內阻(zu)將引起一些升溫效應。 在(zai)-20°C(-4°F)時(shi),大多數電(dian)池 的性能(neng)水平約為50%。 雖然鎳鎘電(dian)池可(ke)以(yi)降(jiang)(jiang)至-40°C(-40°F),但允(yun)許的放電(dian)僅為0.2C(5小時(shi)率(lv))。特種鋰離(li)子電(dian)池可(ke)以(yi)在(zai)-40°C的溫度(du)下工作,但放電(dian)率(lv)只有降(jiang)(jiang)低(di);在(zai)這個溫度(du)下充電(dian)是不(bu)可(ke)能(neng)的。對(dui)于鉛酸(suan),存在(zai)電(dian)解質凍(dong)結的危險,這可(ke)能(neng)使外殼破裂。當(dang)比重更像水而不(bu)是完全充電(dian)時(shi),鉛酸(suan)會以(yi)較低(di)的電(dian)荷更快地凍(dong)結。
具(ju)有相同容量的(de)匹配電(dian)(dian)池(chi)(chi)(chi)在(zai)低(di)溫(wen)和(he)重負(fu)載(zai)下(xia)(xia)放(fang)電(dian)(dian)時起重要作用。由于(yu)電(dian)(dian)池(chi)(chi)(chi)組中的(de)電(dian)(dian)池(chi)(chi)(chi)永遠不能完美匹配,如(ru)果允許放(fang)電(dian)(dian)繼續(xu)超過安全截止點(dian),則在(zai)多電(dian)(dian)池(chi)(chi)(chi)組中的(de)較弱電(dian)(dian)池(chi)(chi)(chi)上(shang)可(ke)能出現負(fu)電(dian)(dian)壓電(dian)(dian)位。被稱為電(dian)(dian)池(chi)(chi)(chi)逆(ni)轉,弱電(dian)(dian)池(chi)(chi)(chi)受(shou)到壓力,直至發(fa)生(sheng)永久(jiu)性(xing)電(dian)(dian)短路(lu)。電(dian)(dian)池(chi)(chi)(chi)計數越大,負(fu)載(zai)下(xia)(xia)電(dian)(dian)池(chi)(chi)(chi)逆(ni)轉的(de)可(ke)能性(xing)越大。低(di)溫(wen)和(he)重負(fu)載(zai)下(xia)(xia)的(de)過放(fang)電(dian)(dian)是無線電(dian)(dian)動工具(ju)電(dian)(dian)池(chi)(chi)(chi)故(gu)障的(de)主要原因。






