Simulation of serpentine cooling structure of battery pack considering mass flow

doi:10.19799/j.cnki.2095-4239.2021.0639

Abstract

Abstract:

A serpentine pipeline battery pack thermal management system with a unidirectional flow structure and bidirectional convection structure was designed for a square lithium iron phosphate battery for electric vehicles, respectively, to address the problem of high surface temperature and poor temperature uniformity during discharge of a large-capacity square lithium-ion power battery pack. To examine the cooling performance of the two thermal management systems, the electrochemical-thermal coupling model of a single cell was firstly developed, and after the model was confirmed experimentally, the maximum battery pack temperature, cooling time, and maximum temperature difference under various mass flow rates were compared and simulated. The cooling time of the unidirectional flow structure is shorter than that of the bidirectional convection structure, and the maximum temperature difference of the bidirectional convection structure's battery pack is smaller than that of the unidirectional flow structure; under a large mass flow rate, the coolant temperature will rise due to the rapid coolant flow rate, affecting the cooling effect.

Key words: square lithium battery, serpentine structure, battery thermal management, liquid cooling, mass flow rate

CLC Number:

TM 911

Jiayu YUAN, Xinguang LI, Wenchao WANG, Chengkuo FU. Simulation of serpentine cooling structure of battery pack considering mass flow[J]. Energy Storage Science and Technology, 2022, 11(7): 2274-2281.

Figures/Tables 13

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材料	厚度/μm	密度/ (kg/m³)	比热容/ [J/(kg·K)]	导热系数/ [W/(m·K)]
正极极耳	250	2713	889	235
正极材料	160	3036	1210	1.42
正集流体	20	2700	889	235
分离层	150	650	1956	0.28
电解液	40	1138	1675	0.35
负极极耳	250	8920	378	400
负极材料	120	1542	1058	1.18
负集流体	10	8920	378	400
铝壳	100	1636	1378	0.43

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