Abstract: Discharge by soaking in NaCl solution is a common safe way to dispose of faulty lithium batteries. In order to find out the discharge effect and failure performance of lithium batteries immersed in NaCl solution, the article carries out immersion experiments on a certain type of lithium-ion battery monomer and module with different concentrations of NaCl solution. The relationship between the chemical reactions occurring during immersion and the concentration of NaCl solution is explored through changes in cell voltage and manifestations of polar ear corrosion. The results show that the discharge rate and corrosion rate are positively correlated with the concentration of NaCl solution. That is, the higher the concentration, the faster the discharge rate and the corrosion rate of the electrode lug. The performance of the battery cells at different positions in the module varies greatly. The battery voltage drop rate at the middle position is significantly higher than that at both sides, and the corrosion rate of the cells near the positive side of the module is much faster than that at the negative side.

Key words: Lithium-ion battery; Battery module; NaCl solution; Chemical discharge

摘要： 浸泡在 NaCl 溶液中进行化学放电是一种常见的故障锂电池安全处置方式，为了摸清锂 电池浸泡在 NaCl 溶液中的放电效果和失效表现，文章对某型号锂离子电池单体和模组进行不 同浓度的 NaCl 溶液浸泡试验，通过电池电压变化、极耳腐蚀表现探究浸泡过程中发生的化学 反应与 NaCl 溶液浓度的关系。结果表明，锂离子电池的放电速率、腐蚀速率与 NaCl 溶液浓 度呈正相关。即浓度越高，放电速率和极耳腐蚀速率越快，且锂离子电池模组中不同位置的 电池单体表现差异较大，中间位置的电池电压放电速率明显高于两侧，靠近模组正极侧的电 池单体腐蚀速率远超过负极侧。

关键词: 锂离子电池；电池模组；NaCl 溶液；化学放电