Mechanical-thermal coupling design on battery pack embedded with concave quadrilateral cellular structure

IF 6.1 2区工程技术 Q2 ENERGY & FUELS

Applied Thermal Engineering Pub Date : 2024-11-19 DOI:10.1016/j.applthermaleng.2024.124973

Ying Zhao , Jibo Hao , Jianfeng Hu , Keming Zhou , Bin Chen , Xingjun Hu , Chenguang Lai

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引用次数: 0

Abstract

To comprehensively investigate mechanical-thermal coupling properties and function-oriented design of battery pack, a novel battery pack with triangular micro-channel cold plate and the optimal embedded concave quadrilateral cellular structure (CQCS) is proposed. Firstly, mechanical properties of CQCS are derived based on beam theory and homogenization theory. Then, thermal conductivity expressions of the CQCS are derived in accordance with Maxwell-Eucken model and negative thermal expansion design of the CQCS is ingeniously conducted to inhibit thermal runaway of battery pack. Moreover, the relations between mechanical properties and thermal properties of CQCS are innovatively investigated through the medium of structural parameters of CQCS. Secondly, modal analyses, collision analyses on conventional battery pack are conducted. Meanwhile, thermal characteristics of battery modules are derived and temperature field distributions are acquired through simulation analysis to provide reference for the design of thermal management system. Subsequently, the embedded CQCS is taken as the medium to conduct mechanical-thermal coupling design of battery pack. Multi-objective optimization models of the CQCS between battery cells and the CQCS between modules are established to obtain the optimal CQCS with the needs of high heat dissipation efficiency, superior temperature uniformity, outstanding collision performances, and more lightweight space of battery pack. Moreover, a convection triangular micro-channel cold plate is chosen as heat dissipation structure and variable density design of micro-channel cold plate is executed to ensure heat dissipation efficiency and temperature uniformity of battery pack. Eventually, the mechanical performances and thermal performances are compared to verify the superiority of the proposed novel battery pack. Compared with conventional battery pack, lower stress levels and more uniform stress distributions can also be achieved, and the resonance between battery pack and autobody can also be avoided effectively. Moreover, compared with conventional battery pack, the maximum temperature differences of battery pack with the optimal CQCS decrease by 10 %, 8.7 %, 10.91 % and 8.75 %, which demonstrates the superiority of the embedded CQCS in decreasing maximum temperature difference of battery pack. Moreover, the temperature differences of novel battery pack decrease by 26.67 %, 27 %, 28.57 %, and 32.88 % in comparations with those of battery pack with the optimal CQCS, which proves that variable density design on triangular micro-channel cold plate can improve temperature uniformity of battery pack effectively.

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嵌入凹面四边形蜂窝结构的电池组的机械热耦合设计

为了全面研究电池组的机械-热耦合特性和面向功能的设计，提出了一种具有三角形微通道冷板和最优嵌入式凹四边形蜂窝结构（CQCS）的新型电池组。首先，基于梁理论和均质化理论推导了 CQCS 的力学性能。然后，根据 Maxwell-Eucken 模型推导出 CQCS 的热导率表达式，并对 CQCS 进行了巧妙的负热膨胀设计，以抑制电池组的热失控。此外，通过 CQCS 的结构参数，创新性地研究了 CQCS 的机械性能和热性能之间的关系。其次，对传统电池组进行模态分析和碰撞分析。同时，通过仿真分析得出电池模块的热特性和温度场分布，为热管理系统的设计提供参考。随后，以嵌入式 CQCS 为媒介，对电池组进行机械热耦合设计。建立了电池单元间的 CQCS 和模块间的 CQCS 的多目标优化模型，以获得散热效率高、温度均匀性好、碰撞性能优越、电池组空间更轻便的最优 CQCS。此外，还选用对流三角形微通道冷板作为散热结构，并对微通道冷板进行变密度设计，以确保电池组的散热效率和温度均匀性。最后，通过对机械性能和热性能的比较，验证了所提出的新型电池组的优越性。与传统电池组相比，新型电池组的应力水平更低，应力分布更均匀，还能有效避免电池组与车身之间的共振。此外，与传统电池组相比，采用最佳 CQCS 的电池组的最大温差分别降低了 10%、8.7%、10.91% 和 8.75%，这表明嵌入式 CQCS 在降低电池组最大温差方面具有优越性。此外，与采用最佳 CQCS 的电池组相比，新型电池组的温差分别减少了 26.67%、27%、28.57% 和 32.88%，这证明三角形微通道冷板上的变密度设计能有效改善电池组的温度均匀性。

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来源期刊

Applied Thermal Engineering 工程技术-工程：机械

CiteScore

11.30

自引率

15.60%

发文量

1474

审稿时长

57 days

期刊介绍： Applied Thermal Engineering disseminates novel research related to the design, development and demonstration of components, devices, equipment, technologies and systems involving thermal processes for the production, storage, utilization and conservation of energy, with a focus on engineering application. The journal publishes high-quality and high-impact Original Research Articles, Review Articles, Short Communications and Letters to the Editor on cutting-edge innovations in research, and recent advances or issues of interest to the thermal engineering community.