Thermal characteristics and model of lithium-ion capacitor

doi:10.19799/j.cnki.2095-4239.2022.0235

Abstract

Abstract:

A lithium-ion capacitor (LIC) has the advantages of long cycle life, high power density, and high energy density. Comprehensive knowledge of LIC thermal characteristics is essential for its practical application. In this study, a temperature rise test of an LIC is performed under various charge and discharge rates, and its thermal model is established and studied based on MATLAB and COMSOL Multiphysics 5.4 software. The results demonstrate that the calorific value of LIC increases with the rise in charge and discharge rates. Based on the lumped parameter thermal model established in MATLAB, the mean absolute error in the temperature rise simulation can be limited to 0.2 ℃, and the temperature distribution variation increases with the rise in discharge rate. By installing the LIC lugs diagonally on the cell, the temperature difference is reduced, making the temperature more uniform, and the arrangement is advantageous in improving performance.

Key words: lithium-ion capacitor, temperature rise, thermal characteristic, thermal model, thermal simulation

CLC Number:

TM 533

Fanqi MIN, Taolin LV, Shiyi FU, Liheng ZHANG, Guoju DANG, Liqin YAN, Jingying XIE, Yunzhi GAO. Thermal characteristics and model of lithium-ion capacitor[J]. Energy Storage Science and Technology, 2022, 11(8): 2629-2636.

Figures/Tables 14

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实验条件	温升/℃	总发热量/J	可逆热/J	焦耳热/J	极化热/J
1 C充电	-1.800	-876.4	-535.6	149.0	—
5 C充电	1.100	535.6	-1018.8	677.4	877.0
10 C充电	3.300	1606.8	-1217.3	1244.1	1580.0
15 C充电	4.900	2385.8	-1387.7	1749.0	2024.5
20 C充电	6.500	3164.9	-1412.0	2165.6	2411.3
1 C放电	0.400	194.8	535.6	147.0	—
5 C放电	5.285	2573.3	1018.8	698.8	855.7
10 C放电	8.300	4041.3	1217.3	1346.7	1477.3
15 C放电	10.600	5161.2	1387.7	1960.4	1813.1
20 C放电	12.300	5988.9	1412.0	2557.8	2019.1

样品	材质	比热容C_p /[J/(K·g)]	导热系数k/(W·m²/K)	密度ρ/(kg/m³)
正极极耳	Al	900	280	2700
负极极耳	Cu	385	400	8960

网格划分方式	粗化	常规	细化	较细化	极细化
自由度	248	554	766	1474	4612
计算时间/s	1	2	3	10	117

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