锂离子电池铝壳腐蚀机理研究与防护分析

Study on corrosion mechanism and protection of aluminum case of lithium-ion battery

研究了方型铝壳锂离子电池的铝壳腐蚀机理,并归纳了铝壳抗腐蚀的防护方法。通过分析锂离子电池内部结构、铝壳腐蚀位置和腐蚀失效机理模型,扫描电子显微镜法(SEM)分析腐蚀表面形貌以及能量散射光谱(EDS)与电感耦合等离子体光谱分析法(ICP)分析元素,得出方型铝壳锂离子电池的铝壳腐蚀现象是化学腐蚀和电化学腐蚀两种协同并存的腐蚀反应结果;通过消除离子通道改善电池内部绝缘防护,可改善电池的铝壳内部腐蚀现象。这为方型铝壳锂离子电池结构设计、绝缘防护的设计提供重要参考方法。

The aluminum case corrosion mechanism of the prismatic lithium-ion battery was studied,and the anticorrosion protection methods of the aluminum case were summarized.The internal structure,aluminum case corrosion location and corrosion failure mechanism model were analyzed.The corrosion surface topography was analyzed by SEM,and the element analysis was conducted by EDS and ICP.It's concluded that the aluminum case corrosion phenomenon of the prismatic lithium-ion battery is the coordinated coexistence results of the chemical corrosion and electrochemical corrosion reaction.By improving the insulation protection in the battery through eliminating ion channel,the aluminum case corrosion can be improved.It provides an important reference method for the structure design and insulation protection design of the prismatic aluminum case lithium-ion battery.