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極(ji)(ji)片的(de)(de)(de)壓(ya)實(shi)(shi)密(mi)度(du)對電(dian)(dian)(dian)池(chi)(chi)的(de)(de)(de)電(dian)(dian)(dian)化學性能有重要(yao)影響。在(zai)(zai)一(yi)定范(fan)圍(wei)內，隨著壓(ya)實(shi)(shi)密(mi)度(du)增(zeng)(zeng)(zeng)加，活性物質粒子(zi)(zi)(zi)(zi)間距減小，接觸面積增(zeng)(zeng)(zeng)大，利(li)(li)于(yu)離子(zi)(zi)(zi)(zi)導電(dian)(dian)(dian)的(de)(de)(de)通(tong)路和橋(qiao)梁增(zeng)(zeng)(zeng)多(duo)，在(zai)(zai)宏觀方面表現為(wei)電(dian)(dian)(dian)池(chi)(chi)內部電(dian)(dian)(dian)阻降(jiang)低。但(dan)若極(ji)(ji)片的(de)(de)(de)壓(ya)實(shi)(shi)密(mi)度(du)太(tai)(tai)大，活性物質粒子(zi)(zi)(zi)(zi)之間接觸程度(du)太(tai)(tai)緊(jin)密(mi)，電(dian)(dian)(dian)子(zi)(zi)(zi)(zi)導電(dian)(dian)(dian)率增(zeng)(zeng)(zeng)加。但(dan)鋰(li)離子(zi)(zi)(zi)(zi)通(tong)道(dao)減少或者堵塞，不利(li)(li)于(yu)容量的(de)(de)(de)發揮，進(jin)(jin)(jin)行(xing)放(fang)(fang)電(dian)(dian)(dian)時(shi)(shi)，極(ji)(ji)化增(zeng)(zeng)(zeng)加，電(dian)(dian)(dian)壓(ya)降(jiang)低，容量下降(jiang)。壓(ya)實(shi)(shi)密(mi)度(du)太(tai)(tai)小時(shi)(shi)，粒子(zi)(zi)(zi)(zi)間距大，鋰(li)離子(zi)(zi)(zi)(zi)移動通(tong)道(dao)通(tong)暢，電(dian)(dian)(dian)解液吸(xi)液能力較強，利(li)(li)于(yu)電(dian)(dian)(dian)池(chi)(chi)內部的(de)(de)(de)鋰(li)離子(zi)(zi)(zi)(zi)移動，但(dan)由于(yu)粒子(zi)(zi)(zi)(zi)間接觸程度(du)不夠緊(jin)密(mi)，不利(li)(li)于(yu)電(dian)(dian)(dian)子(zi)(zi)(zi)(zi)進(jin)(jin)(jin)行(xing)導電(dian)(dian)(dian)，在(zai)(zai)進(jin)(jin)(jin)行(xing)放(fang)(fang)電(dian)(dian)(dian)時(shi)(shi)，易(yi)導致極(ji)(ji)化增(zeng)(zeng)(zeng)加。

輥壓的必要性：極片在涂布、干燥完成后，活物質與集流體箔片的剝離強度很低，此時需要對其進行輥壓，增強活物質與箔片的粘接強度，以防在電解液浸泡、電池使用過程中剝落。

                                                 ;                              極片軋制生產線示意圖

軋制的目的有以下幾點：
1）保證極片表面光滑和平整，防止涂層表面的毛刺刺穿隔膜引發短路；
2）對極片涂層材料進行壓實，降低極片的體積，以提高電池的能量密度；
3）使活性物質、導電劑顆粒接觸更加緊密，提高電子導電率；
4）增強涂層材料與集流體的結合強度，減少電池極片在循環過程中掉粉情況的發生，提高電池的循環壽命和安全性能。

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