锂离子电池不可逆膨胀模型及应用

doi:10.16180/j.cnki.issn1007-7820.2024.09.002

Abstract

Abstract:

In view of the problem of rapid estimation of capacity attenuation after multiple charge and discharge cycles of LIB(lithium-ion battery), a new method based on the capacity attenuation model of lithium-ion battery is proposed to rapidly estimate its internal capacity attenuation using the external expansion displacement of the battery.Based on the capacity attenuation model of LIB, the radial irreversible expansion model is derived, and the cylindrical LIB Sanyo UR18650E is modeled and solved by COMSOL Multiphysics, and the numerical results are compared with the experimental data, so as to verify the proposed model. Based on the above model, the causes of capacity attenuation and irreversible expansion of battery due to side reactions during the charge-discharge cycle are analyzed.The results show that the change of side reaction rate causes the gradient distribution of the concentration of side reaction products in the negative electrode, and the accumulation of side reaction products causes the expansion displacement of the battery to increase linearly with the cycle.The function formula of the cell capacity attenuation and its radial displacement is obtained by using the side reaction product as a bridge, which provides a new method for the rapid estimation of the capacity attenuation.

Key words: lithium-ion battery, capacity fade, expansion, SEI, electrochemical-thermal-mechanical, battery management system, side reactions, battery aging

CLC Number:

TP391.9

WANG Yahui, LI Peichao, WANG Keyong. Irreversible Expansion Model for Lithium-Ion Batteries and its Application[J].Electronic Science and Technology, 2024, 37(9): 8-13.

Figures/Tables 7

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参数	单位	数值
ρ_SEI	kg·m^-3	1 690
ρ_Li	kg·m^-3	534
M_SEI	kg·mol^-1	0.162
M_Li	kg·mol^-1	6.94×10^-3
δ_0,film	nm	5
S_cell	mm²	106 185.83
V₀	mm³	16 540.49
r₀	mm	9
d_h	mm	65

Irreversible Expansion Model for Lithium-Ion Batteries and its Application

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