Thermal adaptability of energy storage battery pack in extreme conditions

doi:10.19799/j.cnki.2095-4239.2023.0956

Abstract

Abstract:

The thermal simulation analysis of a liquid-cooled energy storage battery pack was conducted at room temperature, and the results were compared and analyzed against thermal test results obtained under the same working conditions. The simulation parameters were adjusted to match the technological level, ensuring the error between the simulated and experimental values at measurement points remained within 1 ℃. Using these parameters, thermal simulations of the battery pack were performed under extreme environmental conditions of high and low temperatures. In the high-temperature scenario, the battery cells reached their final discharge state, while in the low-temperature scenario, they remained in a static state. The calculations indicate that the average cell temperature under high-temperature conditions was 39.2 ℃, with the highest temperature recorded at 41.2 ℃. Conversely, the average cell temperature under low-temperature conditions was 7.8 ℃, with the lowest temperature at 3.7 ℃. These findings indicate that the liquid-cooled battery pack can maintain cell temperatures within the normal operating range, even in extreme environments. The thermal simulation method outlined in this study offers a comprehensive approach to analyzing the battery pack's thermal state under extreme conditions, providing an avenue to assess the thermal performance of the energy storage system when experimental costs are prohibitive, or conditions cannot be replicated.

Key words: liquid cooling, lithium-ion batteries, charging and discharging equipment, thermal characteristic

CLC Number:

TM 911

Qi SUN, Hao PENG, Qingguo MENG, Dekai KONG, Rui FENG. Thermal adaptability of energy storage battery pack in extreme conditions[J]. Energy Storage Science and Technology, 2024, 13(6): 2039-2043.

Figures/Tables 10

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References 9

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区域	参数
电芯发热功率	12 W
铝排电流	140 A
环境温度	25 ℃
空气对流面换热系数	2~5 W/(m²·K)
冷却液流量	5 L/min
冷却液入口温度	20 ℃

区域	热导率/[W/(m·K)]	密度/(kg/m³)	比热容/[J/(kg·K)]
汇流排	237	2702	903
电芯	20/20/1.2	2800	1000
液冷板	193	2800	880
流体	0.384	1071.11	3300
导热胶	1.2	1900	270
绝缘层	0.1	900	1000
PC板	0.3	1200	1100
环氧树脂	0.2	2000	1.1
泡棉	0.05	10	1.3

测点	实验值	仿真值	误差
T1	33.17	32.01	1.16
T2	32.64	33.78	-1.14
T3	32.96	33.74	-0.78
T4	34.76	35.64	-0.88
T5	34.70	35.62	-0.92
T6	32.79	33.89	-1.10
T7	32.93	33.79	-0.86
T8	33.96	34.43	-0.47
T9	33.61	34.50	-0.89
T10	33.65	34.18	-0.53
T11	33.06	34.04	-0.98
T12	34.64	35.61	-0.97
T13	34.35	35.59	-1.24
T14	32.97	34.14	-1.17
T15	33.36	34.20	-0.84
T16	32.25	31.53	0.72

环境工况	最高温度	最低温度	平均温度
45 ℃高温工况	41.2	35.7	39.2
-20 ℃低温工况	3.7	11.2	7.8

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