锂离子动力电池铝壳壳体电位研究

Study on the Potential of Aluminum Can of Lithium Ion Power Battery

分析影响锂离子动力电池外壳电位的影响因素,结果表明:壳体表面残留的电解液,电芯外层隔膜破损,极耳包胶不完整均会影响壳体电位;正极对壳体电位超过1V,会导致壳体腐蚀的发生。为避免壳体发生腐蚀,通常采用的方法有对电芯外部增加绝缘保护袋,在铝壳内部增加绝缘保护涂层,对极耳进行绝缘胶纸全覆盖。

The influence factors of the potential of aluminum can of lithium ion oower battery was analyzed, the re-sults showed that： the residual electrolyte on aluminum cans, the damage of the cell＇s outer separator, the incomplete-ness of the tapes on tab, all these factors influenced the potential of aluminum can; The potential difference between the positive electrode and aluminum cans going over IV would cause the corrosion of aluminum cans. In order to avoid such problems, it is often advisable to increase insulation bags out of cells, to increase insulation coating layers on the inner surface of aluminum cans, or to tally cover tabs by insulation tapes.