二次流蛇形通道锂离子电池散热性能

doi:10.19799/j.cnki.2095-4239.2023.0006

摘要/Abstract

摘要：

针对传统蛇形流道的大压降、高功耗问题，结合二次流结构，设计了一种新型的二次流蛇形液冷板，建立仿真模型，对比了传统蛇形液冷板和二次流蛇形液冷板的性能。另外，进一步研究了不同流速下二次流通道数量、通道宽度、通道角度、通道距离对二次流蛇形流道传热和压降特性的影响。结果表明，传统蛇形液冷板在增加了二次流结构后，液冷板进出口压降下降了90.69%，很大程度上解决了传统蛇形流道的问题；随着流速的增大，不同结构参数的液冷板的冷却效果增强，在流速大于0.4 m/s后，最高温度维持在303 K左右，最大温差维持在4.5 K左右，压降和泵功随流速增大而增加；各个结构参数都存在最优值，当通道数量为7，通道宽度为4 mm，通道角度为75°，通道距离为8 mm时，系统的压降大大降低，很大程度上节省了泵功。

关键词: 锂离子电池, 液冷, 蛇形流道, 二次流

Abstract:

A new secondary flow serpentine liquid cold plate is proposed to address the issues of high-pressure drop and significant power consumption associated with traditional serpentine channels combined with secondary flow structures. This study establishes a simulation model to compare the performance of traditional serpentine liquid cold plates and secondary flow serpentine liquid cold plates. Furthermore, the effects of factors such as channel numbers, width, angle, and distance on the secondary flow serpentine flow channel's heat transfer and pressure drop characteristics under various flow velocities are investigated. The results show that incorporating the secondary flow structure into the traditional serpentine liquid cold plate reduces the pressure drop at the inlet and outlet by 90.69%, largely resolving the issue present in traditional serpentine channels.As the flow rate increases, the cooling effect of the liquid cold plate with different structural parameters improves; once the flow rate exceeds 0.4 m/s, the maximum temperature stabilizes around 303 K, and the maximum temperature difference remains at approximately 4.5 K. Pressure drop and pump work also increase with the flow rate. Each structural parameter has an optimal value; when the number of channels is 7, the channel width is 4 mm, the channel angle is 75°, and the channel distance is 8 mm, the system's pressure drop is significantly reduced, leading to substantial pump work savings.

Key words: lithium-ion batteries, liquid cooling, serpentine channel, secondary flow

中图分类号:

TM 911

陈雅, 范立云, 李晶雪, 李美斯, 徐超, 顾远琪. 二次流蛇形通道锂离子电池散热性能[J]. 储能科学与技术, 2023, 12(6): 1880-1889.

Ya CHEN, Liyun FAN, Jingxue LI, Meisi LI, Chao XU, Yuanqi GU. Research on heat dissipation of lithium-ion batteries with secondary flow serpentine channel[J]. Energy Storage Science and Technology, 2023, 12(6): 1880-1889.

图/表 11

图1

表1

电池物性参数"

电池部件	密度/(kg/m³)	比热容/[J/(kg·K)]	导热系数/[W/(m·K)]
电芯	1934.2	1399	$λ x = λ y = 10$ ； $λ z = 1$
正极	2719	871	202.4
负极	8978	381	387.6

表1

图2

表2

图3

图4

图5

图6

图7

图8

图9

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时间步长/s	压降/kPa	相对误差	电池模组最高温度/K	相对误差
1	6.320097	0.0027%	307.0621	0.0519%
5	6.320097	0.0027%	307.01519	0.0366%
10	6.320092	0.0028%	307.01762	0.0374%
15	6.320106	0.0026%	306.79002	0.0368%
20	6.320268	——	306.9027	——

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