Thermal characteristics of lithium-ion battery with sinusoidal charge and discharge pulsating current

doi:10.19799/j.cnki.2095-4239.2021.0196

Abstract

Abstract:

The actual charging and discharging current of the battery in the cascaded H-bridge energy storage system and MMC energy storage system is the superposition of sinusoidal alternating current (AC) and constant direct current (DC), forming a sinusoidal pulsating current. The fluctuation of battery charging and discharging current has a great influence on the thermal characteristics of the battery, which determines the thermal management measures and battery service life. Based on this condition, the thermal characteristics of a LiFePO₄ battery under sinusoidal pulsating charge and discharge current were investigated in this study using a one-dimensional electrochemical model and compared to those under constant DC. The results show that the transient thermal power and internal resistance of the battery fluctuate periodically with the current; When the fluctuation amplitude of the sinusoidal AC component is 25% that of the DC component, the discharge and charge processes cause only 5% and 2.8% extra heating, respectively, when compared to the pure DC charge and discharge. However, as the fluctuation amplitude of the sinusoidal AC component increases further, the battery heating increases sharply; from the middle to both ends of SOC, the phase difference between voltage drop and current increases, indicating an increase in the capacitive effect; as the frequency of current pulsation increases, the heating of the battery decreases.

Key words: battery energy storage, lithium ion battery, thermal characteristics, sinusoidal pulsating current

CLC Number:

TM 461

Zeng'ang JIA, Zhibin LING, Xuguang LI. Thermal characteristics of lithium-ion battery with sinusoidal charge and discharge pulsating current[J]. Energy Storage Science and Technology, 2021, 10(6): 2260-2268.

Figures/Tables 14

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参数	正极	隔膜	负极
长度l/μm	85	16	53
电极体积分数ε_s	0.603	—	0.647
电解质体积分数ε_l	0.336	0.37	0.269
颗粒半径r₀/μm	1.7	—	2.5
锂离子扩散系数/(m²/s)	3.2×10^-13	—	1.45×10^-13
电导率δ/(s/m)	91	—	100

ε	放电/%	充电/%
0.25	5	2.8
0.5	20	10.4
0.75	44.3	22.6
1	78.3	39.4
1.25	122	60.6
1.5	176	86.3

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