Abstract:

In order to improve the cooling performance of the cooling plate and solve the problem of high pressure loss, a composite X-channel liquid cooling plate structure was used to study the heat dissipation performance of lithium-ion battery. By considering the channel inclination angle, channel position, and inlet channel angle as design variables, the comprehensive cooling performance of the liquid-cooled plate was evaluated using an objective function that included average temperature, temperature standard deviation, and pressure drop. Subsequently, the optimal structural parameters of the liquid-cooled plate were determined. The heat production and temperature rise characteristics of the battery under different discharge multipliers were obtained through single-cell experiments. The thermal generation and temperature increase characteristics of the battery at various discharge rates were determined through experiments conducted on a single cell. Latin Hypercube Sampling (LHS) was employed to select 70 sample points within the design space. An approximate model, specifically Response Surface Approximation (RSA), was then utilized to establish the relationship between the design variables and the objective function. The RSA model was subsequently optimized using the Non-Dominated Sorting Genetic Algorithm Ⅱ (NSGA-Ⅱ), and the validity of the optimization outcomes was confirmed via Computational Fluid Dynamics (CFD) simulations. The results show that the pumping power of the liquid cooling plate is effectively improved, the pressure drop is reduced by 37.865%, and the overall cooling performance is increased by 55.3% compared with the initial model.

Key words: lithium-ion battery, battery thermal management system(BTMS), liquid cooling, multi-objective optimization, pressure loss