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New Li-ion Battery Evaluation Research Based on Thermal Property and Heat Generation Behavior of Battery
Zhe Lv, Xun Guo, Xin-ping Qiu*
Key Laboratory of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, China
Abstract:
We do a new Li-ion battery evaluation research on the effects of cell resistance and polariza-tion on the energy loss in batteries based on thermal property and heat generation behavior of battery. Series of 18650 cells with different capacities and electrode materials are evalu-ated by measuring input and output energy which change with charge-discharge time and current. Based on the results of these tests, we build a model of energy loss in cells' charge-discharge process, which include Joule heat and polarization heat impact factors. It was reported that Joule heat was caused by cell resistance, which included DC-resistance and reaction resistance, and reaction resistance could not be easily obtained through routine test method. Using this new method, we can get the total resistance R and the polarization parameter η. The relationship between R, η, and temperature is also investigated in order to build a general model for series of different Li-ion batteries, and the research can be used in the performance evaluation, state of charge prediction and the measuring of consistency of the batteries.
Key words:  Li-ion battery, Energy loss, Heat, Cell resistance, Polarization, State of charge prediction
FundProject:
基于电池热特性及产热行为的新型锂离子电池评价
吕喆, 郭勋, 邱新平*
清华大学化学系,有机光电子及分子工程国家重点实验室,北京100084
摘要:
建立了一种新的基于锂离子电池热特性及产热行为的电池性能评价方法. 通过测量一系列不同容量及电极材料的18650电池在不同充放电时间及电流下其充放电能量的变化,建立了一个包含焦耳热与极化热影响因子的表达电池在充放电过程中的能量损失的模型. 利用这种模型,计算出电池总内阻R以及极化参数′,并且对R及′在不同温度下的变化情况进行了研究,建立一个对不同电池和不同温度都适用的普适性模型.
关键词:  锂离子电池,能量损失,放热,电池内阻,极化,SOC预测
DOI:10.1088/1674-0068/25/06/725-732
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