三维控制图在锂离子电池性能监测中的应用

为了在锂离子电池加速退化试验中监测锂离子电池的性能状态,为分选提供依据,引用了质量管理中的控制图方法.在锂离子电池失效机理的分析中,获得了可以表明电池当前性能状态的两个关键参数:开路电压和放电容量,并讨论了它们的关系;采用放电容量和开路电压形式的二维平面点作为三维控制图的主体,通过相关试验数据使用SPSS数理统计软件确定控制上下限;最后使用MATLAB完成三维控制图,并叙述了几种控制图的分析方法.该结论适用于电池产品的验收和分选,也可为评估电池的寿命及可靠性提供依据.

Application of 3D control chart in performance monitoring and sorting of Li ion batteries

In order to sort Li ion batteries and monitor their performance status, the control chart method was applied, which used to utilize in quality control. Firstly some interrelated analyses were done about the failure mechanisms of Li ion battery to select the parameters that could reasonably describe the status of them. Then the optimization of the control chart especially for the batteries was carried out in detail. The 3D control chart which could monitor two parameters simultaneously was agreeable to our analysis. By Matlab and SPSS the chart was totally accomplished. And through the results, the judgments of the healthy situation, the prediction of the faults could be made using some specific and suitable principles. Some test results in the lab of reliability and environment of Beijing University of Aeronautics and Astronautics (Beihang University) were used as the source data and example. The test process is also concisely introduced.