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JIANG Shuisheng,MA Long,JIANG Guangjun,WEN Hua,JIANG Xiannian.Analysis of Transient Heat Generation Characteristics for Lithium-ion Batteries During Discharge[J].JOURNAL OF POWER SUPPLY,2019,17(2):171-177
Analysis of Transient Heat Generation Characteristics for Lithium-ion Batteries During Discharge
Received:June 23, 2017  Revised:December 17, 2018
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DOI:10.13234/j.issn.2095-2805.2019.2.171
Keywords:ithium-ion battery  entropy heat coefficient  discharge process  transient thermal characteristic  heat generation rate
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JIANG Shuisheng School of Mechatronics Engineering, Nanchang University, Nanchang , China
MA Long School of Mechatronics Engineering, Nanchang University, Nanchang , China
JIANG Guangjun School of Mechatronics Engineering, Nanchang University, Nanchang , China
WEN Hua School of Mechatronics Engineering, Nanchang University, Nanchang , China wenhua25@ncu.edu.cn
JIANG Xiannian Jiangling Group New Energy Automobile Co., Ltd, Nanchang , China
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Abstract:
      To explore the transient thermal characteristics of lithium-ion batteries used in pure electric vehicles during discharge, the internal resistance at different temperatures and the temperature rise curves at different discharge rates were obtained through tests, and the transient heat generation rates were calculated at different discharge rates. According to the transient heat generation rate and the heat generation rate of internal resistance under the discharge rate of 0.5 C, the curve of entropy heat(i.e., heat generated in the reversible reaction) coefficient was calculated, and the effect of entropy heat characteristics of the lithium-ion battery on the transient heat generation characteristics was analyzed. Results show that the transient thermal characteristics of the lithium-ion battery were mainly influenced by the transient characteristics of internal resistance and entropy heat; entropy heat was the main factor influencing the temperature fluctuation during discharge, and the heat absorption phenomenon caused by the phase change reaction would appear in the middle of the discharge process. At a small discharge rate, entropy heat had more influences on the temperature field of the battery than the internal resistance heat; however, at a large discharge rate, the relation was reversed. The analyses in this paper can provide reference for the establishment and improvement of the transient heat generation model of batteries.
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