基于柱状电池的大功率锂离子电池系统温度均匀化的先进热管理

M. Gepp, R. Filimon, S. Koffel, Vincent R. H. Lorentz, M. März
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引用次数: 19

摘要

为了延长锂离子电池的使用寿命,研究了一种先进的热管理理念。在电池模块中,不同的电池温度会导致电池平衡的工作量增加,并降低系统的使用寿命。特别是当相变材料的电池系统在相变范围外工作时,会发生高温梯度,导致电池的老化速度不同。进一步研究了温度老化对电池芯的影响。通过优化模块设计和材料特性,提出了一种电池模块概念,重点关注温度均匀化。该模块设计结合了多种方法,包括优化界面垫、储热材料和各向异性多层石墨片。采用材料模型和几何模型进行了数值模拟,对参考模型的概念进行了评价。此外,还建立了描述可逆和不可逆产热速率的电芯模型。采用模型降阶方法,减少了计算时间,加快了仿真速度。为了优化材料参数,采用设计探索技术对仿真结果进行了分析。因此,模块内的整体温差被最小化,并且使用新开发的界面垫均匀化了温度分布。与高导热合成石墨片相结合,衬垫还补偿了储热材料的绝缘行为,用于降低温度峰值和平滑温度变化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Advanced thermal management for temperature homogenization in high-power lithium-ion battery systems based on prismatic cells
In order to extend the lifetime of lithium-ion batteries, an advanced thermal management concept is investigated. In battery modules, different cell temperatures lead to higher efforts in cell balancing and reduce the system's lifetime. Especially when battery systems with phase change material operate outside the phase transition range high temperature gradients can occur that result in different ageing speeds of the cells. The effect of temperature dependent ageing of the battery cells is further investigated. A battery module concept is developed with focus on temperature homogenization by optimization of the module design and material characteristics. The module design combines several approaches including optimized interface pads, thermal storage materials and anisotropic multilayer graphite sheets. Numerical simulations with material and geometrical models are used for the evaluation of the concept with reference models. In addition, a battery cell model is set up, which describes the reversible and irreversible heat generation rate. Using model-order-reduction, the simulations are accelerated by reduction of the calculation time. In order to optimize the material parameters, the simulations are analyzed with design exploration techniques. As a result, the overall temperature differences in the module are minimized and the temperature distribution is homogenized with new developed interface pads. In combination with high thermally conductive synthetic graphite sheets the pads also compensate the insulating behavior of thermal storage material, which is used for temperature peak reduction and to smooth temperature changes.
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