摘要
Abstract
The domestic and international markets have a huge demand for green electricity,leading to the widespread application of large-scale industrial and commercial energy storage systems.However,batteries face challenges such as poor thermal stability,increased side reactions under high-temperature conditions,and the risk of thermal runaway.To more effectively control the operating temperature of battery packs within the optimal range of 20-35 ℃,the numerical simulation study was conducted on three key factors that significantly affect the temperature characteristics of battery packs,using an experimental calibration simulation model.The three factors are different aspect ratio hole types,the layout of the liquid cooling plates,and different inlet water flow rates.The research results show that the hole-type flow channels with different aspect ratios have little effect on the battery pack temperature,but have a greater impact on the liquid flow field pressure drop and energy consumption.Compared to the simple bottom cooling method,the layout of bottom+two side liquid cooling plates can significantly reduce the maximum temperature of the battery cells by 21.8％,while greatly improving the uniformity of the cell temperatures by 68.1％.The moderate bottom cooling water flow rate of 10-12.5 L/min can effectively constrain the high temperature of the battery cells through convective heat transfer and improve the temperature uniformity of the battery pack.The liquid flow pressure drop and the energy consumption of the liquid cooling system are also relatively low.Taking into account the three factors of hole shape W/H=3,the layout of the bottom and two side liquid cooling plates,and a water flow rate of 12.5 L,the battery pack exhibits the best performance in terms of maximum temperature rise and temperature uniformity.The cooling effect of the single bottom and two side cooling factors is very close to that of the multi-factor cooling performance,with a difference of only 0.1oC.In the multi-factor comprehensive cooling process of batteries,the cooling factors of a single bottom and two sides play a dominant role.关键词
热稳定性/数值模拟/适宜温度/对流换热/流场压降/系统能耗Key words
thermal stability/numerical simulation/suitable temperature/convective heat transfer/flow field pressure drop/system energy consumption分类
能源科技
