液冷系统具有高热导率和高比热容,而液冷板在液冷系统中至关重要,液冷板内部流道的结构状态直接影响锂离子电池的最高温度、温度均匀性和温度一致性.为了实现在5C放电速率、环境温度为299.15 K的工作情况下,电池最高温度和温差在安全工作范围内的目标,本工作设计了一种由余弦函数组成的双螺旋状流道液冷板,以电池最高温度和温差为评价指标,运用Ansys Fluent有限元分析软件研究了双螺旋流道不同函数振幅、入口流速、函数周期和流道宽度对冷板散热性能的影响,然后采用正交试验和极差分析对4种影响因素进行重要程度排序.结果表明:入口流速和流道函数周期能够显著影响锂离子电池的最高温度、温度均匀性和温度一致性;增加入口流速、流道宽度和流道函数周期,锂离子电池的最高温度和温差均减小,温度均匀性得到提升;函数振幅对电池温度影响最小.确定了最优结构的组合为振幅25 mm、入口流速0.2 m/s、周期2、流道宽度5 mm.与初始结构相比,优化后的结构电池组最高温度和温差分别降低了2.36 K和1.27 K.
Numerical optimization of a liquid cooling plate with double helix flow channel for lithium-ion battery
A liquid cooling system offers high thermal conductivity and specific heat capacity,making the liquid cooling plate is a crucial component within the system.The design and structural of the internal flow channels within the cooling plate directly influence the maximum temperature,temperature uniformity,and overall temperature consistency of the lithium-ion battery.To ensure that the maximum temperature and temperature difference of the battery remain within the safe operating range under the a 5C discharge rate and an ambient temperature of 299.15 K,this study designs a double-helix shaped flow channel for a liquid cooling plate based on a cosine function.The evaluation indexes include the battery's maximum temperature and temperature difference.Using Ansys Fluent finite element analysis software,the study investigates the effects of various parameters—such as function amplitude,inlet flow rates,function periods,and channel widths—on the heat dissipation performance of the cooling plate.The four influencing factors are then ranked in order of importance through orthogonal tests and range analysis.The results indicate that the inlet flow rate and runner function period significantly impact the maximum temperature,temperature uniformity,and temperature consistency of lithium-ion batteries.By increasing the inlet flow rate,runner width,and function period,the maximum temperature and temperature difference are reduced,leading to improved temperature uniformity.The function amplitude has the least effect on battery temperature.The optimal structure was determined to have a function amplitude of 25 mm,an inlet flow rate of 0.2 m/s,a period of 2,and a runner width of 5 mm.Compared to the initial structure,the optimized design reduced the battery pack's maximum temperature by 2.36 K and temperature difference by 1.27 K.
lithium ion batteriesliquid-cooled platedouble helix structured runnercosine functionorthogonal test
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