锂离子电池失效率模型的探讨

以工作电流和工作温度(壳温)为主要考虑因素,建立了锂离子电池基本失效率模型和工作失效率模型.以试验数据为基础,参照国军标GJB/Z299,提出了失效率相关的调整系数(π系数)及其取值方案.采用失效率模型,通过数值计算得到基本失效率预计值,将预计值与试验值进行了比较.最终计算结果表明,得到的失效率模型可以应用于工程实践,锂离子电池效率模型的建立,为其可靠性预计提供了基础.

Research on failure rate model of lithium-ion batteries

Base failure rate model and operating failure rate model were developed to predict the reliability of the lithium-ion batteries. Firstly, the mostly failure models of lithium-ion batteries were analysised, and the operating current and temperature were regarded as the main accelerating factors of the failure of lithium-ion batteries. Secondly, consulting the GJB/Z299 , the life-testing data was used to calculating the numerical values of the parameters of the models, and to buid the adjusting coefficient(π-coefficient)project. By using the models, the predicting failure values under different operating currents and temperatures were calculated. The predicting failure values were then compared with the life-testing values. The results indicate that the base failure rate model and operating failure rate model are feasible for engineering practise.