鋰離子電池在電芯正負極組裝的方式上面有2種，一種是卷繞式，其優點是結構簡單，只需1片正極和1片負極，電池比(bi)能量大(da)，其(qi)(qi)缺點(dian)是(shi)，極(ji)(ji)(ji)(ji)片(pian)長，電(dian)(dian)(dian)(dian)池(chi)內阻(zu)大(da)，不(bu)利(li)于(yu)(yu)(yu)大(da)電(dian)(dian)(dian)(dian)流充放(fang)電(dian)(dian)(dian)(dian)，比(bi)功率小(xiao);另一種是(shi)疊片(pian)式，其(qi)(qi)優點(dian)是(shi)，極(ji)(ji)(ji)(ji)片(pian)短，電(dian)(dian)(dian)(dian)池(chi)內阻(zu)相(xiang)對較小(xiao)，有利(li)于(yu)(yu)(yu)大(da)電(dian)(dian)(dian)(dian)流充放(fang)電(dian)(dian)(dian)(dian)，其(qi)(qi)缺點(dian)是(shi)，電(dian)(dian)(dian)(dian)池(chi)極(ji)(ji)(ji)(ji)片(pian)多，產生(sheng)邊料多，生(sheng)產效率低，另外，多層(ceng)極(ji)(ji)(ji)(ji)片(pian)焊(han)(han)(han)接有困難，特別多層(ceng)負(fu)極(ji)(ji)(ji)(ji)，使(shi)用(yong)(yong)(yong)的(de)(de)是(shi)銅箔，銅箔導電(dian)(dian)(dian)(dian)性好，不(bu)利(li)于(yu)(yu)(yu)電(dian)(dian)(dian)(dian)阻(zu)焊(han)(han)(han)，銅箔熔點(dian)高，也(ye)不(bu)利(li)于(yu)(yu)(yu)超聲焊(han)(han)(han)，可能虛(xu)焊(han)(han)(han)，焊(han)(han)(han)不(bu)牢，也(ye)可能過焊(han)(han)(han)，部(bu)分(fen)極(ji)(ji)(ji)(ji)片(pian)焊(han)(han)(han)斷或部(bu)分(fen)焊(han)(han)(han)斷，出(chu)現虛(xu)焊(han)(han)(han)和過焊(han)(han)(han)，都會使(shi)部(bu)分(fen)負(fu)極(ji)(ji)(ji)(ji)不(bu)起(qi)作用(yong)(yong)(yong)，電(dian)(dian)(dian)(dian)池(chi)低容，更嚴重的(de)(de)是(shi)正極(ji)(ji)(ji)(ji)起(qi)作用(yong)(yong)(yong)而負(fu)極(ji)(ji)(ji)(ji)不(bu)起(qi)作用(yong)(yong)(yong)，會在使(shi)用(yong)(yong)(yong)過程中產生(sheng)析鋰(li)而出(chu)現安全事(shi)故。小(xiao)尺寸(cun)小(xiao)容量的(de)(de)電(dian)(dian)(dian)(dian)池(chi)不(bu)適合使(shi)用(yong)(yong)(yong)疊片(pian)式生(sheng)產，比(bi)如一lox20mm、-50mAh的(de)(de)電(dian)(dian)(dian)(dian)池(chi)，因為極(ji)(ji)(ji)(ji)片(pian)小(xiao)而難以操(cao)作。

目前鋼殼圓柱形18650鋰離子電池都(dou)是(shi)(shi)卷(juan)繞式結構，具有卷(juan)繞式結構的(de)(de)優(you)點和缺點。采用卷(juan)繞式結構，在局部焊接(jie)極耳，做大電(dian)(dian)(dian)流(liu)充放電(dian)(dian)(dian)時，不(bu)(bu)管極片涂(tu)布得多么(me)的(de)(de)均(jun)勻(yun)，都(dou)必然會產生(sheng)電(dian)(dian)(dian)流(liu)密(mi)度分布不(bu)(bu)均(jun)勻(yun)的(de)(de)情況(kuang)，當大電(dian)(dian)(dian)流(liu)大倍(bei)率充電(dian)(dian)(dian)時，充電(dian)(dian)(dian)電(dian)(dian)(dian)流(liu)分布也是(shi)(shi)不(bu)(bu)均(jun)勻(yun)的(de)(de)，鋰(li)(li)離子在負(fu)極上(shang)獲(huo)得電(dian)(dian)(dian)子的(de)(de)速度是(shi)(shi)很快的(de)(de)，但鋰(li)(li)離子在負(fu)極活性物質內的(de)(de)擴散是(shi)(shi)速度控制步驟，由于擴散不(bu)(bu)及時，容(rong)易(yi)發(fa)生(sheng)析(xi)鋰(li)(li)，特別是(shi)(shi)電(dian)(dian)(dian)流(liu)分布密(mi)集的(de)(de)地方，因(yin)而容(rong)易(yi)發(fa)生(sheng)安全事故;或者析(xi)出的(de)(de)鋰(li)(li)變成死鋰(li)(li)，電(dian)(dian)(dian)池(chi)的(de)(de)容(rong)量容(rong)易(yi)衰減，循(xun)環壽(shou)命(ming)短。能量型鋰(li)(li)離子電(dian)(dian)(dian)池(chi)使用高倍(bei)率做充放循(xun)環，循(xun)環壽(shou)命(ming)短，循(xun)環后安全性變差(cha)，就(jiu)是(shi)(shi)這個原因(yin)。