一种基于热力学理论的车载锂电池组水冷系统设计优化
Design optimization of water cooling system for vehicle lithium battery pack based on thermodynamic exergy theory
摘要：
基于热力学理论，对车载锂电池组的水冷系统进行了优化设计，建立了损失模型。针对一款电动SUV车型锂电池，通过理论分析和实际测试，比较了4种典型水冷布局的控温效果。在不同放电条件下，分别测试了4种水冷布局下单体电池的最大温差及出现位置。测试结果表明：当冷却水首先流经电池组中央区域时，锂电池组传热网络的损失最小，电池组的实测最大温差为3.1 K，低于其他3种水冷布局，各单体电池的最高温度也比其他3种水冷布局低1.1~5.9 K。理论分析和实验结果较吻合，证明理论可用于车载锂电池散热优化设计和改进。
Abstract：
Based on the thermodynamic exergy theory, optimizes the water cooling system of vehicle lithium battery pack and establishes an exergy loss model. For the lithium battery of an electric SUV car, compares the temperature control effects of four typical water-cooled layouts by means of theoretical analysis and practical test. Under different discharge conditions, tests the maximum temperature difference and location of single cell in four kinds of water-cooled layout. The test results show that the exergy loss of heat transfer network for the lithium battery pack is the smallest when the cooling water first flows through the central area of the battery pack. The measured maximum temperature difference of the battery pack is 3.1 K, which is lower than the other three water-cooled layouts, and the maximum temperature of each single cell is 1.1 to 5.9 K lower than the other three water-cooled layouts. The theoretical analysis is in good agreement with the experimental results, which proves that the exergy theory can be used in the optimization design and improvement of the heat dissipation of the vehicle lithium battery.
Keywords:vehicle,lithiumbattery,exergyanalysis,thermalmanagement,watercoolingsystem,optimization