基于正弦函数的液冷板上流体流向对锂离子电池散热性能的影响

doi:10.19799/j.cnki.2095-4239.2023.0141

摘要/Abstract

摘要：

锂离子电池的散热性能与液冷板上流道的形状、液流流向、液流入口温度、液流入口流速和放电倍率等有关。本工作以电池最高温度、温差、温度标准差及压降为评价指标，设计了一种正弦函数液冷板流道，运用COMSOL有限元软件分析正弦流道频率与振幅对锂离子电池散热性能的影响并探讨不同放电倍率、不同入口温度和不同入口流速条件下流体流向对锂离子电池的最高温度、温度均匀性和温度一致性的影响。结果表明：低频率和低振幅的正弦函数流道有利于电池的散热；改变流体流向有利于改善锂离子电池的最高温度、温度均匀性和温度一致性；随着交错流次数的增加，锂离子电池的最高温度和温差均减小；高放电倍率下流体流向对锂离子电池散热性能的影响更大；液流入口温度为25 ℃时，改变流体流向锂离子电池的散热效果最佳。

关键词: 正弦函数, 锂离子电池, 流体流向, 散热性能

Abstract:

The heat-dissipation performance of lithium-ion batteries is related to the shape of the flow channel on a liquid cooling plate, flow direction, discharge rate, and temperature and velocity at the inlet. Using the maximum temperature, temperature difference, temperature standard deviation, and pressure drop with respect a lithium-ion battery (LIB) as evaluation indicators, a sine-function liquid-cooled plate channel is designed herein. The influences of the frequency and amplitude of the sine function on the heat-dissipation performance of LIBs are analyzed using the COMSOL finite element software. Herein, the influence of fluid-flow direction on the maximum temperature, temperature uniformity, and temperature consistency in LIBs under different discharge rates, inlet temperatures, and inlet velocities, respectively, are discussed. The results of this study show that the sine channel with low frequency and low amplitude is beneficial for heat dissipation from LIBs. It is beneficial of the flow direction change to improve the maximum temperature, temperature uniformity and temperature consistency of LIBs. The maximum temperature and temperature difference in LIBs decreases with the increasing number of staggered flow direction. The heat-dissipation performance of LIBs is improved more by fluid-flow direction at a high discharge rate than that at a low discharge rate. When the inlet temperature is 25 ℃, the effect of the heat dissipation of lithium-ion batteries is best by the variation of the flow direction.

Key words: sine function, lithium ion batteries, flow direction of fluid, heat dissipation performance

中图分类号:

TM 911

唐程波, 锁要红, 何昭坤. 基于正弦函数的液冷板上流体流向对锂离子电池散热性能的影响[J]. 储能科学与技术, 2023, 12(8): 2547-2555.

Chengbo TANG, Yaohong SUO, Zhaokun HE. Effect of fluid-flow direction on heat dissipation from lithium-ion batteries based on sine-function cooling plate[J]. Energy Storage Science and Technology, 2023, 12(8): 2547-2555.

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材料特性	锂离子电池	液冷板	冷却液
密度 ρ/(kg/m³)	3000	2719	997.5
比热容C_p /[J/(kg·K)]	1005.91	871	4179
导热系数k/[W/(m·K)]	k_x =k_y =0.302，k_z =22.48	202.4	0.613
动力黏度 μ /(m/s²)	—	—	0.0007

放电倍率	A₁	A₂	A₃	A₄	A₅	A₆	A₇
1 C	4.9132×10^-16	-3.7742×10^-12	1.0679×10^-8	-1.3417×10^-5	7.6000×10^-3	-2.2208	1.7152×10⁴
2 C	1.2578×10^-13	-4.8310×10^-10	6.8347×10^-7	-4.2934×10^-4	1.2160×10^-1	-17.763	6.6623×10⁴
3 C	3.2235×10^-12	-8.2542×10^-9	7.7851×10^-6	-3.2303×10^-3	6.1570×10^-3	-59.961	1.4841×10⁵

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