分层优化测定锂离子电池比热容参数的实验研究

An Experimental Investigation on Determination of Specific Heat Capacity of Lithium-ion Batteries by Hierarchical Optimization

锂离子电池比热容作为电池模组及系统热设计的关键参数,对所建立的电池热管理系统仿真模型和控制策略的准确性至关重要。本文中基于量热法搭建了一个成本低廉、实施简单和测量准确性高的测试平台,系统研究了量热装置的热损失、量热方式以及分层计算优化对测试结果的影响。在黄铜、304不锈钢、铸铁以及高密度聚乙烯标准件样品校验测试中,实验结果表明该量热装置测定比热容误差小于3%,且不受被测样品导热系数大小的影响。通过本实验装置测定32650磷酸铁锂电池的平均比热容为1.022 J·g^(-1)·K^(-1),这为其他类型电池甚至下一代固态电池精确测量比热容热物性参数提供了一种可行的方法。

As a key parameter of battery module and system thermal design,the specific heat capacity of lithium-ion batteries has a significant impact on the accuracy of the simulation model and control strategies of the established battery thermal management system.Based on the calorimetric method,a test platform with low cost,simple implementation and high measurement accuracy is established.The influence of heat loss,calorimetric method and hierarchical optimization of the calorimetric device on the test results is systematically studied.In the sample calibration test of brass,304 stainless steels,cast iron and high-density polyethylene standard parts,the experimental results show that the specific heat capacity error of the calorimetric device is less than 3%,and it is not affected by the thermal conductivity of the test sample.The average specific heat capacity of 32650 LiFePO4 batteries is determined to be 1.022 J·g^(-1)·K^(-1) by this experimental device,which provides a feasible method to accurately measure the thermal physical parameters of specific heat capacity of other types of batteries and even next-generation solidstate batteries.