Coupled electrochemical and thermal battery models for thermal management of prismatic automotive cells
Coupled electrochemical and thermal battery models for thermal management of prismatic automotive cells
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DOI：
10.1016/j.applthermaleng.2018.01.094
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发表时间：
2018-03
影响因子：
6.4
通讯作者：
K. Darcovich;D. MacNeil;S. Recoskie;B. Kenney
中科院分区：
文献类型：
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作者：
K. Darcovich;D. MacNeil;S. Recoskie;B. Kenney
本研究将二维欧姆定律有限体积法与简化的汽车电池组热状态电化学模型相结合，确定了棱柱型电池组的电流分布。其目的是开发一种模拟工具，用于评估汽车电池组在实际使用条件下的冷却效果。欧姆定律模型通过赋予以前经验性的来源术语一个化学和物理基础而得到加强。这一模拟被应用于2D电极片，确定被体积映射到热模拟中的热生成值，而热模拟又更新了电化学模拟。通过将实验数据与模拟结果进行拟合，确定了电池参数以及容量衰减动力学。在参考驱动周期下测试的测功机数据提供了对电池单元的电流需求。模拟了不同冷却水平下30 A H棱柱型电池的热分布。被动式和强制空气冷却模拟的终点温度都高于40 °C(313 K)，这被认为对延长电池寿命来说过高。一个反映液体冷却系统的模拟场景将US06驾驶周期的温度增量保持在约2 K。使用液体冷却，汽车电池可以更好地防止热驱动的退化。
This study combines a two-dimensional Ohm’s law finite-volume approach determining the current distribution in prismatic battery cells with a simplified electrochemical model for the thermal state of automotive battery packs. The objective was to develop a simulation tool for assessing the effect of cooling effort applied to automotive battery packs under real-life usage conditions. The Ohm’s law model was enhanced by imparting a chemical and physical basis to source terms previously found empirically. This simulation was applied to 2D electrode sheets, determining thermal generation values that were mapped volumetrically into a thermal simulation, which in turn, updated the electrochemical simulation. Battery parameters, along with capacity fade kinetics were determined by fitting experimental data to simulated results. Dynamometer data from tests under reference drive cycles provided current demands on battery cells. Thermal profiles simulated for 30 A h prismatic cells at different cooling levels. Passive and forced air cooling simulations both gave endpoint temperatures upwards of 40 °C (313 K), considered excessive for preserving the battery life. A simulation scenario which reflected a liquid cooling system kept the temperature gain for a US06 drive cycle to about 2 K. With liquid cooling, an automotive battery is better protected against thermally driven degradation.