Modeling and verification of electric-thermal coupling in batteries based on ECM

doi:10.19799/j.cnki.2095-4239.2023.0080

Abstract

Abstract:

The internal resistance of a battery affects its electrical performance and the temperature during its operation. Herein, the second-order equivalent circuit model (ECM) is established through the constant-current charge-discharge shelving test, which identifies the capacitance and resistance parameters of the cell under different currents, temperatures, and state-of-charge conditions, and calculates the electric performance of the cell. Additionally, Bernardi's heat generation model is introduced to account for the irreversible heat, and the combination of irreversible and reversible heat is calculated to determine the overall heat generation within the cell. By coupling the electric-thermal model in STAR-CCM+, the electrical and temperature responses of the battery are simulated under different working conditions. To overcome the shortcomings of the hybrid pulse power characterization test, such as short pulse time and incomplete characterization of internal resistance, this study adopts a constant-current charge-discharge shelving test to obtain the RC parameters and conducts an equivalent circuit simulation. The research results show that when the RC parameters obtained from the constant-current charge-discharge shelving test are imported into the electric-thermal coupling model, the simulation results have minimal deviation compared with the experimental results.

Key words: equivalent circuit model, Bernardi heat generation model, constant-current charge-discharge shelving test, electro-thermal coupling, STAR-CCM+

CLC Number:

TM 912

Yun DI, Zhengzhu ZHOU, Huihong DANG, Zhihao GE. Modeling and verification of electric-thermal coupling in batteries based on ECM[J]. Energy Storage Science and Technology, 2023, 12(8): 2638-2648.

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步骤	程序	截止条件
1	0.33 C恒流放电(25 ℃)	电压≤3 V
2	静置(25 ℃)	时间≥2 h
3	0.5 C恒流充电(25 ℃)	单步容量≥5.2 Ah
4	静置(25 ℃)	时间≥1 h
循环步骤3～4	…	循环数≥10
S1	0.33 C恒流充电(25 ℃)	电压≥4.2 V
S2	4.2 V恒压充电(25 ℃)	电流≤0.05 C
S3	静置(25 ℃)	时间≥2 h
S4	0.5 C恒流放电(25 ℃)	单步容量≥5.2 Ah
S5	静置(25 ℃)	时间≥1 h
循环步骤S4～S5	…	循环数≥10
倒数第二步	0.33 C恒流放电(25 ℃)	电压≤3 V
最后一步	静置(25 ℃)	时间≥1 h

步骤	程序	截止条件
1	0.33 C恒流充电(室温)	电压≥4.2 V
2	4.2 V恒压充电(室温)	电流≤0.05 C
3	静置(室温)	时间≥5 h
4	0.5 C恒流放电(室温)	电压≤3 V
5	静置(室温)	时间≥1 h

步骤	程序	截止条件
1	0.33 C恒流充电(25 ℃)	电压≥4.2 V
2	4.2 V恒压充电(25 ℃)	电流≤0.05 C
3	静置(25 ℃)	时间≥2 h
4	0.33 C恒流放电(25 ℃)	单步容量≥5.2 Ah
5	静置(10 ℃)	时间≥8 h
6	静置(25 ℃)	时间≥8 h
7	静置(55 ℃)	时间≥8 h
循环步骤3～6	…	循环数≥10

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