Thermal-flow-electric coupling performance analysis of a liquid-immersed battery thermal management system  

作　　者：Qiang GAO Jun TIAN Chujin BAO Yangfan ZHONG Chengbin ZHANG Yongping CHEN 

机构地区：[1]School of Energy and Environment,Southeast University,Nanjing 210096,China [2]Battery Testing Center,China North Vehicle Research Institute,Beijing 100072,China [3]Zhejiang Immertech Co.,Ltd.,Hangzhou 310000,China [4]Alibaba Cloud Computing Co.,Ltd.,Shenzhen 518100,China

出　　处：《Science China(Technological Sciences)》2025年第1期153-172,共20页中国科学(技术科学英文版)

基　　金：supported by the National Key R&D Program of China(Grant No.2021YFB3803203)。

摘　　要：Ensuring the safety and performance of lithium-ion batteries(LIBs)is a significant challenge for electric vehicles.To tackle this issue,an innovative liquid-immersed battery thermal management system(LIBTMS)using bionic baffles with fish-like perforations is developed.The thermal-flow-electric coupling characteristics of LIBTMSs with different baffle structures(no baffle,conventional baffle,baffle with circular perforations and baffle with fish-like perforations)are systematically investigated using experimental and numerical methods.The results indicate that the forced flow scheme exhibits better thermal management performance and voltage equalization than static flow.Moreover,the LIB temperatures and voltage deviations of different LIBTMSs increase quickly with increasing discharge rates.More importantly,the innovative LIBTMS exhibits the best thermoelectric performance due to its excellent thermoelectric equilibrium behavior caused by high electrical and temperature consistency,as well as the best overall performance involving the balance between the pressure loss and heat transfer capacity of the system.Compared with other structures,the innovative LIBTMS using baffles with fish-like perforations exhibits a maximum reduction of 10.1%,15.2%,25.8%and 9.0%in LIB maximum temperature,maximum temperature difference,system pressure drop and voltage deviation,respectively,under the same operating conditions.Furthermore,for the LIBTMS using baffles with fish-like perforations,the bottom inlet and top outlet configuration and coolant precooling are suggested to enhance cooling performance.

关 键 词：BAFFLE liquid-immersed thermoelectric performance lithium-ion battery battery thermal management 

分 类 号：TM912[电气工程—电力电子与电力传动]