差示绝热追踪的锂电池比热容测试方法研究  

Research on specific heat capacity test method of lithium battery based on differential adiabatic tracking

作　　者：单博学 吴育新 许启跃[1] 丁炯[1] 叶树亮[1] SHAN Boxue;WU Yuxin;XU Qiyue;DING Jiong;YE Shuliang(Institute of Industry and Trade Measurement Technology,China Jiliang University,Hangzhou Zhejiang 310018,China;Young Instruments,Hangzhou Zhejiang 310018,China)

机构地区：[1]中国计量大学工业与贸易计量技术研究所,浙江杭州310018 [2]杭州仰仪科技有限公司,浙江杭州310018

出　　处：《电源技术》2021年第5期606-610,640,共6页Chinese Journal of Power Sources

基　　金：国家自然科学基金(21927815);浙江省公益技术研究计划(LGF18B030001)。

摘　　要：受限于仪器原理,传统绝热加速量热仪测量锂电池比热容时存在一定的热散失。然而,现有的测试方法均选择忽略该热散失对比热容测量结果的影响。针对上述不足,提出一种基于差示绝热追踪的锂电池比热容测试方法。首先,基于传统方法与本文改进的方法,对方形和圆柱形的标准样品进行比热容测试,将测得的比热容与标准样品的参考比热容对比,得到了两种测试方法的最大误差分别为7.66%和1.94%。其次优化了圆柱形样品打包方式,实验验证的结果表明优化后的方式减小了热散失对测量结果的影响。最后,利用改进方法测试50 Ah NCM622方形电池以及15 Ah LiFePO4圆柱形电池的比热容,在40~65℃温度范围内,其比热容测试值分别稳定在0.94~0.98 J/(g·K)和0.97~1.01 J/(g·K)之间。Limited by the principle of the instrument,the traditional adiabatic acceleration calorimeter has a certain heat loss when measuring the specific heat capacity of lithium battery.However,the existing test methods choose to ignore the influence of the heat loss on the results of heat capacity measurement.In view of the above shortcomings,a specific heat capacity test method based on differential adiabatic tracking is proposed.Firstly,based on the traditional method and the improved method in this paper,the specific heat capacity of square and cylindrical standard samples is tested.Comparing the measured specific heat capacity with the reference specific heat capacity of the standard sample,the maximum error of the two methods is 7.66%and 1.94%respectively.Secondly,the packing method of cylindrical sample is optimized.The experimental results show that the optimized method reduces the measurement errors caused by heat loss.Finally,the specific heat capacities of 50 Ah NCM622 square cell and 15 Ah LiFePO4 cylindrical battery were measured by the improved method.In the temperature range of 40~65℃,the measured values of specific heat capacities were stable between 0.94~0.98 J/(g·K)and 0.97~1.01 J/(g·K),respectively.

关 键 词：绝热加速量热仪 锂电池比热容测试 热散失 差示绝热追踪 

分 类 号：TM912[电气工程—电力电子与电力传动]