基于VCHTC的锂电池热力学精细化仿真

doi:10.19799/j.cnki.2095-4239.2021.0252

储能科学与技术 ›› 2022, Vol. 11 ›› Issue (1): 246-252.doi: 10.19799/j.cnki.2095-4239.2021.0252

基于VCHTC的锂电池热力学精细化仿真

王翔¹(), 徐晶¹(), 陈新文², 丁亚军³, 徐鑫¹

^1.扬州大学机械工程学院，江苏扬州 225000
^2.同济大学汽车学院，上海 200082
^3.上汽大通无锡分公司，江苏无锡 214000

收稿日期:2021-06-07 修回日期:2021-06-25 出版日期:2022-01-05 发布日期:2022-01-10
通讯作者: 徐晶 E-mail:549253463@qq.com;jingxu@yzu.edu.cn
作者简介:王翔（1996—），男，硕士研究生，研究方向为电池热管理，E-mail：549253463@qq.com|徐晶，副教授，研究方向为电池热管理，E-mail：jingxu@yzu.edu.cn。
基金资助:
国家自然科学基金项目(52105344);江苏省六大人才高峰项目(2015-ZBZZ-035)

Refined thermodynamic simulation of lithium battery based on VCHTC

Xiang WANG¹(), Jing XU¹(), Xinwen CHEN², Yajun DING³, Xin XU¹

^1.School of Mechanical Engineering, Yangzhou University, Yangzhou 225000, Jiangsu, China
^2.School of Automobile, Tongji University, Shanghai 200082, China
^3.SAIC Maxus Wuxi Branch, Wuxi 214000, Jiangsu, China

Received:2021-06-07 Revised:2021-06-25 Online:2022-01-05 Published:2022-01-10
Contact: Jing XU E-mail:549253463@qq.com;jingxu@yzu.edu.cn

摘要/Abstract

摘要：

对流换热系数(convective heat transfer coefficient，CHTC)是锂离子电池(lithium-ion battery，LIB)热力学仿真过程中的重要参数。在电池热力学仿真过程中，通常将CHTC设置为固定值。尽管可以获得令人满意的仿真结果，但是仿真过程与实际情况不一致，并且不能准确地预测电池放电期间的温升特性。变对流换热系数(variable convective heat transfer coefficient，VCHTC)可以随电池放电而变化，并提高了仿真过程的准确性。本文研究了在不同环境温度和放电倍率下单体锂离子电池(single lithium-ion battery，SLIB)的温升特性，利用VCHTC建立了电池的生热优化模型。通过对SLIB正常工况范围内的仿真和实验对比分析，结果表明，VCHTC模型的仿真过程温度和恒定对流传热系数(constant convective heat transfer coefficient，CCHTC)模型在不同工况下的平均绝对百分误差(mean absolute percentage error，MAPE)分别为1.1%和6.9%。

关键词: 对流换热系数, 锂离子电池, 热力学仿真, 温升特性, 平均绝对百分误差

Abstract:

The convective heat transfer coefficient (CHTC) is an important parameter in the process of the lithium-ion battery (LIB) thermodynamic simulation and is usually set to a fixed value during this process. Although satisfactory simulation results can be obtained, the simulation process cannot be consistent with the actual situation, and the temperature rise characteristics during the battery discharge cannot be accurately predicted. The variable CHTC (VCHTC) can change with the battery discharge and improve the simulation process accuracy. This study investigates the temperature rise characteristics of a single LIB (SLIB) under variable ambient temperatures and discharge rates. The battery heat generation optimization model is established using the VCHTC. The comparison results between the simulations and the experiments on the SLIB under normal working conditions show that the simulated process temperature of the VCHTC and the constant CHTC has mean absolute percentage errors of 1.1% and 6.9%, respectively, at various operating conditions.

Key words: convective heat transfer coefficient, lithium-ion battery, thermodynamic simulation, temperature rise characteristics, mean absolute percentage error

中图分类号:

TM 912

王翔, 徐晶, 陈新文, 丁亚军, 徐鑫. 基于VCHTC的锂电池热力学精细化仿真[J]. 储能科学与技术, 2022, 11(1): 246-252.

Xiang WANG, Jing XU, Xinwen CHEN, Yajun DING, Xin XU. Refined thermodynamic simulation of lithium battery based on VCHTC[J]. Energy Storage Science and Technology, 2022, 11(1): 246-252.

图/表 12

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参数	正极	负极	内核
密度/(kg/m³)	2710	8900	2378.96
体积/m³	3.18×10^-7	2.54×10^-7	9.23×10^-6
换热系数/[W/(m²·K)]	202.4	387.6	0.91/15.3
比热容/[W/(kg·K)]	871	381	992.97
内阻/Ω	8.1×10^-4	4.8×10^-4	—

放电倍率/C	R(20 ℃)/Ω	R(25 ℃)/Ω	R(30 ℃)/Ω	R(35 ℃)/Ω
0.5	0.0220	0.0214	0.0218	0.0214
1.0	0.0222	0.0221	0.0227	0.0225
1.5	0.0212	0.0215	0.0213	0.0221
2.0	0.0222	0.0233	0.0232	0.0236
2.5	0.0223	0.0239	0.0235	0.0233

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基于VCHTC的锂电池热力学精细化仿真

Refined thermodynamic simulation of lithium battery based on VCHTC

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