Electrochemical-thermal coupled simulation and tab optimization of lithium ion battery based on three-dimensional multi-layer structure

doi:10.19799/j.cnki.2095-4239.2019.0245

Abstract

Abstract:

This work focused on the electrochemical-thermal coupled simulation of lithium-ion battery based on three-dimensional multi-layer structure. Temperature and current characteristics of the smallest unit of prismatic battery were analyzed, and tab size was optimized. Temperature and voltage results of experiments under 0.5 C, 1 C, and 2 C constant current discharge processes agreed well with the simulation, and indicated that the model could be furtherly used to analyze the electrochemical and thermal characteristics of the batteries. It was found that with the increase of discharge rate, the maximum temperature rise of the battery at the end of discharge increased in the trend of the convex curve, and it was high to 33.83 ℃ at the end of 2 C discharge process. And The increasing trend of the maximum temperature difference was in the concave curve, which was 1.6645 ℃ at 2 C discharge process. Both the average current density perpendicular to the separator and the current density difference were found linearly increased with the increasing discharge rate. At the end of 2 C discharge process, they were 43.62 A/m² and 2.0 A/m², respectively. Besides, the temperature rise and maximum temperature difference of the battery were significantly correlated with the resistance ratio of the negative tab to positive tab (Sc). The optimal Sc value was considered to be around 0.875. When Sc was less than 0.875, the maximum temperature rise and maximum temperature difference decreased rapidly at a rate of 1.52 ℃/Sc and 5.2 ℃/Sc respectively. When Sc was greater than 0.875, the maximum temperature rise decreased at a slow rate of 0.2021 ℃/Sc, and the maximum temperature difference increasing rate was 0.1934 ℃/Sc. In addition, the average current density perpendicular to the separator and the current density difference were found little affected by Sc.

Key words: lithium-ion batteries, three-dimensional multi-layer structure, electrochemical-thermal couple, simulation, tab optimization

CLC Number:

TM 911

CHEN Caixing, NIU Huichang, LU Ruiqiang, LI Zhao, LI Lei, HUANG Xinyan. Electrochemical-thermal coupled simulation and tab optimization of lithium ion battery based on three-dimensional multi-layer structure[J]. Energy Storage Science and Technology, 2020, 9(3): 831-839.

Figures/Tables 15

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参数	铜箔	负极	隔膜	正极	铝箔
层厚度 L/μm	3（half）	63	16	86.5	7.5（half）
活性材料体积分数ε _s	—	0.565^Est	—	0.518^Est	—
孔隙率ε _l	—	0.33^Est	0.4	0.332^Est	—
粒径R _s /μm	—	12	—	2	—
最大浓度c _max /mol·m^-3	—	31370 ^[16,18]	—	22806 ^[16,18]	—
初始荷电状态SOC₀	—	0.90 ^Est	—	0.04^Est	—
电荷传递数α	—	0.5 ^[16,18]	—	0.5 ^[16,18]	—
反应速率k _0,ref /m^2.5 ·mol^-0.5 ·s^-1	—	1.764×10^{-11 [17,18]}	—	3.626×10^{-11 [17,18]}	—
反应活化能E _aR /kJ·mol^-1	—	4 ^[17,18]	—	4 ^[17,18]	—
扩散速率D _ref /m² ·s^-1	—	3.9×10^{-14 [16,17]}		1.25×10^{-15 [17]}	—
扩散活化能E _ad /kJ·mol^-1	—	4 ^[17,18]	—	20 ^[17,18]	—
电导率σ /S·m^-1	5.998×10⁷	2 ^[17]	—	0.05^Fit	3.774×10⁷
离子传递数t₊	—	—	0.363 ^[16,17]	-	—
密度ρ /kg·m^-3	8960	1810	1250	2330	2700
比热容c_p/J·(kg·K)^-1	385	1437 ^[16,17]	2055 ^[16]	1260 ^[16,17]	900
导热系数λ /W·(m·K)^-1	400	1.04 ^[16,17]	0.16^Est	1.48 ^[16,17]	238

序号	1	2	3	4	5	6	7	8	9
正极耳宽度W _pos/mm	95.5	75.2	57.9	43.4	28.9	25.3	21.7	18.1	14.5
电阻比Sc	3.30	2.6	2.0	1.5	1	0.875	0.75	0.625	0.5

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