锂离子电池方形铝壳电芯使用方式研究

Research on the use mode of square aluminum can for lithium-ion battery

通过对产线生产的21115-24 Ah方形铝壳电芯正常放置和倒置两种使用方式,在常温储存、高温储存以及高温循环三种使用环境下进行研究。利用扫描电子显微镜、能谱定量分析、电感耦合等离子体光谱等方法对正常放置和倒置使用的电芯内部进行表征。研究发现,倒置使用的电芯在常温储存和高温储存条件下存在压降偏大的现象,高温倒置循环漏液率较高,正负极柱出现电化学腐蚀现象,造成金属离子溶出,长期使用会影响循环寿命,甚至安全性。

Through the production line production of 21115-24 AH square aluminum shell cell normal placement and inversion of the use of three conditions of room temperature storage,high temperature storage and high temperature cycle were studied.Scanning electron microscope,energy spectrum quantitative analysis,inductively coupled plasma spectrum and other methods were used to characterize the inner part of the cell in normal placement and inversion.The study found that the inverted cell had a large pressure drop under the condition of normal temperature storage and high temperature storage,high temperature inverted cycle leakage rate,positive and negative pole electrochemical corrosion phenomenon,resulting in the dissolution of metal ions,long-term use will affect the cycle life and safety.