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圆柱锂电池的特性有哪些?

2022-10-13

圆柱锂电池

圆(yuan)柱锂电(dian)(dian)池,尤其(qi)是18650,由于其(qi)自身的(de)(de)结构(gou)特征及其(qi)型号(hao)的(de)(de)标准化,在(zai)三种主要电(dian)(dian)池形式中是高(gao)的(de)(de)。这使得有可能(neng)具有高(gao)度(du)的(de)(de)一致性(xing)和相应的(de)(de)产量(liang)增加。

一(yi)、圆柱锂(li)电(dian)池的优点

1) 单体一致(zhi)性(xing)好;

2) 单体(ti)具有良好的机械性能(neng)。与方形和软包(bao)装(zhuang)电(dian)池相比(bi),封闭(bi)圆柱体(ti)在(zai)近似尺寸下可以获(huo)得高的弯曲强度;

3) 技术成熟(shu),成本低,但同(tong)时,成本优化的空间已经(jing)消耗了差(cha)不(bu)多;

4) 单体的能量小,形式在发生(sheng)事故时很容易控制,但这也成为(wei)它被取代的原因(yin);

5) 圆柱锂电池PACK成组

圆形电(dian)池相(xiang)对更容易使用,因此电(dian)池组解决方案简单(dan),散热(re)效果(guo)好。方形电(dian)池组时应解决散热(re)问题。

二、圆柱(zhu)锂电池的缺点

1) 在电(dian)动汽(qi)车的(de)(de)背景(jing)下,电(dian)池(chi)系(xi)统(tong)中圆(yuan)柱电(dian)池(chi)的(de)(de)数(shu)量非常多(duo),这大(da)大(da)增(zeng)加(jia)了电(dian)池(chi)系(xi)统(tong)的(de)(de)复杂性。与其(qi)他两种类(lei)型的(de)(de)电(dian)池(chi)相比,系(xi)统(tong)级(ji)成本圆(yuan)柱电(dian)池(chi)高;

2) 在(zai)温(wen)度不均匀(yun)的(de)环(huan)境条件下,大(da)量电(dian)(dian)池芯特性异化的(de)概(gai)率增(zeng)加。当然,特斯拉在(zai)设计之(zhi)(zhi)初(chu)选择(ze)(ze)18650,相(xiang)信是(shi)一种无奈(nai)的(de)选择(ze)(ze),因为10年前,只有(you)圆柱(zhu)电(dian)(dian)池才有(you)资格(ge)量产。电(dian)(dian)池的(de)安(an)全性和热管理要求(qiu),取而代(dai)之(zhi)(zhi)的(de)是(shi)其(qi)强大(da)的(de)电(dian)(dian)子控制系(xi)统的(de)研(yan)发动(dong)力。

3) 能量密度的(de)上升空间已经很小。


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