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在鋰電池(chi)生產的(de)最后一(yi)道工序(xu)是對鋰電池(chi)進行分級(ji)、篩選，以(yi)保證組成電池(chi)模組的(de)電池(chi)一(yi)致(zhi)性(xing)好(hao)，電池(chi)模組的(de)性(xing)能優異。

眾所周知，使(shi)用(yong)一(yi)致性(xing)高(gao)的(de)電(dian)(dian)(dian)池(chi)(chi)(chi)組(zu)成的(de)模組(zu)，使(shi)用(yong)壽(shou)命更長，一(yi)致性(xing)不(bu)好的(de)電(dian)(dian)(dian)池(chi)(chi)(chi)模組(zu)由于水桶效應，容易出(chu)現過充過放現象，電(dian)(dian)(dian)池(chi)(chi)(chi)壽(shou)命衰減加快。例如，電(dian)(dian)(dian)池(chi)(chi)(chi)容量不(bu)一(yi)致會使(shi)電(dian)(dian)(dian)池(chi)(chi)(chi)組(zu)各單體電(dian)(dian)(dian)池(chi)(chi)(chi)放電(dian)(dian)(dian)深度不(bu)一(yi)致。容量較(jiao)小、性(xing)能較(jiao)差的(de)電(dian)(dian)(dian)池(chi)(chi)(chi)將提前達到滿(man)充電(dian)(dian)(dian)狀態，造成容量大、性(xing)能好的(de)電(dian)(dian)(dian)池(chi)(chi)(chi)不(bu)能達到滿(man)充電(dian)(dian)(dian)狀態。

電(dian)(dian)(dian)(dian)(dian)池電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)的(de)(de)不一致(zhi)將(jiang)導致(zhi)并(bing)聯(lian)電(dian)(dian)(dian)(dian)(dian)池組(zu)中單體電(dian)(dian)(dian)(dian)(dian)池互充電(dian)(dian)(dian)(dian)(dian)，電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)較高的(de)(de)電(dian)(dian)(dian)(dian)(dian)池將(jiang)給電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)較低的(de)(de)電(dian)(dian)(dian)(dian)(dian)池充電(dian)(dian)(dian)(dian)(dian)，這會加快電(dian)(dian)(dian)(dian)(dian)池性能(neng)的(de)(de)衰減(jian)，損耗整個(ge)電(dian)(dian)(dian)(dian)(dian)池組(zu)的(de)(de)能(neng)量。自(zi)放電(dian)(dian)(dian)(dian)(dian)速率大的(de)(de)電(dian)(dian)(dian)(dian)(dian)池容量損失(shi)大，電(dian)(dian)(dian)(dian)(dian)池自(zi)放電(dian)(dian)(dian)(dian)(dian)速率的(de)(de)不一致(zhi)將(jiang)導致(zhi)電(dian)(dian)(dian)(dian)(dian)池荷電(dian)(dian)(dian)(dian)(dian)狀態(tai)、電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)產生(sheng)差(cha)異(yi)(yi)，影響(xiang)電(dian)(dian)(dian)(dian)(dian)池組(zu)的(de)(de)性能(neng)。等等這些電(dian)(dian)(dian)(dian)(dian)池間的(de)(de)差(cha)異(yi)(yi)，長期的(de)(de)使(shi)用(yong)下去會影響(xiang)整個(ge)模組(zu)的(de)(de)使(shi)用(yong)壽命(ming)。

電(dian)池的分級(ji)、篩(shai)選(xuan)就是為了(le)避(bi)免不一(yi)致的電(dian)池同時流(liu)出。其中電(dian)池內阻(zu)和(he)自放電(dian)測試是必(bi)檢項，一(yi)般來講電(dian)池內阻(zu)分為歐姆內阻(zu)和(he)極化(hua)內阻(zu)。

歐姆內(nei)(nei)阻(zu)由電極(ji)(ji)材料、電解液、隔膜電阻(zu)及各(ge)部分零件的(de)(de)接觸電阻(zu)組成，包括(kuo)電子(zi)阻(zu)抗(kang)、離(li)(li)子(zi)阻(zu)抗(kang)以及接觸阻(zu)抗(kang)。極(ji)(ji)化(hua)(hua)內(nei)(nei)阻(zu)是指電化(hua)(hua)學反應時由極(ji)(ji)化(hua)(hua)引起的(de)(de)電阻(zu)，包括(kuo)電化(hua)(hua)學極(ji)(ji)化(hua)(hua)內(nei)(nei)阻(zu)和濃差極(ji)(ji)化(hua)(hua)內(nei)(nei)阻(zu)。電池(chi)(chi)的(de)(de)歐姆內(nei)(nei)阻(zu)由電池(chi)(chi)的(de)(de)總電導(dao)率決(jue)定(ding)，電池(chi)(chi)的(de)(de)極(ji)(ji)化(hua)(hua)內(nei)(nei)阻(zu)由鋰離(li)(li)子(zi)在電極(ji)(ji)活性材料中(zhong)的(de)(de)固相(xiang)擴散系數決(jue)定(ding)。總體上看來，鋰電池(chi)(chi)的(de)(de)內(nei)(nei)阻(zu)離(li)(li)不(bu)開工藝設計、材料本(ben)身(shen)、環(huan)境(jing)等幾(ji)大方面。

江門市(shi)朗達(da)鋰電(dian)(dian)池(chi)有限公司是一(yi)家在華南地(di)區獲(huo)得ISO9001認證的(de)電(dian)(dian)池(chi)設(she)(she)計，開發和制造的(de)公司，專門生產(chan)磷(lin)酸鋰離(li)子(zi)（LiFePO4）,鋰離(li)子(zi)，鎳鎘和鎳氫充電(dian)(dian)電(dian)(dian)池(chi)。無論您(nin)(nin)的(de)開發預算(suan)和時(shi)間表(biao)如何(he)，朗達(da)都可以提供電(dian)(dian)源解決方案，使您(nin)(nin)的(de)設(she)(she)備具(ju)有競(jing)爭(zheng)優勢(shi)。期(qi)待與(yu)您(nin)(nin)的(de)合作！