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Title: Effect of Preload Force on Heat Generation of Li(Ni0.8Co0.1Mn0.1)O2/SiOx-C System Batteries: The Discharge Process
题目：预紧力对Li(Ni0.8Co0.1Mn0.1)O2/SiOx−C体系电池产热特性的影响分析：放电过程
Authors: LIN Chunjing, LAI Zhenxing, BAI Guangli, MA Biao, WEI Zhen, QI Chuang, LIU Shiqiang
作者：林春景，赖贞行，白广利，马彪，韦振，齐创，刘仕强
单位：重庆理工大学车辆工程学院，中汽研新能源汽车检验中心(天津)有限公司
Journal of Thermal Science, 2024, 33(5): 1809-1825.
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摘要
Abstract:Lithium-ion batteries (LIBs) undergo various degradation phenomena such as material decomposition, structural change and uneven lithium ion distribution during long-term cycles, which would affect their performance and safety. In order to improve the performance of the LIBs during their life cycle, preload force is preset when the batteries are assembled. Different preload forces will in turn affect the cycle life and heat generation of the battery. In order to address this issue, this work carries out charge/discharge cycle tests on a NCM811 battery under different preload forces. Isothermal calorimetry tests are performed to investigate the battery heat generation under different states of health (SOHs) and preload forces. Based on the test results, an empirical prediction model for heat generation power as a function of SOH is established. Results show that when the preload force is 5 N·m, the battery capacity decreases in the slowest rate and the average heat generation power is the lowest. Changes in peaks of the incremental capacity curve can be used to characterize the loss of lithium at the electrode, which in turn characterizes the change of heat generation power of the battery. The average heat generation power is mainly affected by the SOH, going through a period of trough with the decrease of the SOH and continuing to increase after crossing the critical point. In general, these findings emphasize the relationship between preload force, SOH and heat generation power, which is helpful for the judgment of optimal preload to improve the efficiency of LIBs.
摘要：在长期充放电循环后，锂离子电池内部会发生各种材料的分解、结构变化和分布不均等劣化现象，进而影响锂离子电池的性能以及安全性。为了提高电池在生命周期内的性能，电池在进行成组时会预设一定的夹紧力来控制电池厚度的变化。不同的预紧力又会反过来影响电池的循环特性和产热特性。针对这一问题，本文以NCM811/硅碳体系软包锂离子电池为研究对象，对不同预紧力下的电池进行了充放电循环测试，进而采用等温量热仪测试了不同SOH和不同预紧力下电池的产热特性，并基于此建立了电池产热功率随SOH变化的经验预测模型。研究结果表明：当预紧力为5 N·m时，电池容量衰减最慢并且平均产热功率最低；IC曲线的特征峰值变化可以用来表征电极活性锂的损失，进而表征电池产热功率的变化；电池平均产热功率主要受SOH的影响，电池平均产热功率随SOH的降低会经历一段波谷，过了临界点以后平均产热功率会持续增大。这些发现共同强调了预紧力、SOH和产热特性之间错综复杂的关系，强调了调整最佳预紧力对提高锂离子电池效率的重要意义。
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引用格式
LIN Chunjing, LAI Zhenxing, BAI Guangli, MA Biao, WEI Zhen, QI Chuang, LIU Shiqiang, Effect of Preload Force on Heat Generation of Li(Ni0.8Co0.1Mn0.1)O2/SiOx-C System Batteries: The Discharge Process, Journal of Thermal Science, 2024, 33(5): 1809-1825.
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