A novel heat dissipation structure based on flat heat pipe for battery thermal management system

Abstract

Summary Flying car is an effective transport to solve current traffic congestion. The power batteries in flying cars discharge at a high current rate in the takeoff and landing phase, evoking a severe thermal issue. Flat heat pipe (FHP) is a relatively new type of battery thermal management technology, which can effectively maintain the temperature uniformity of the battery pack. We have constructed a resistance‐based thermal model of the batteries considering the impact of the state of charge (SOC), battery temperature, and current on the battery heat generation. The FHP model is developed based on segmental heat conduction model, and integrated into the battery model to form the battery‐FHP‐coupled model for a battery module. Experiments are carried out to verify its accuracy. Then, the battery thermal performance is analyzed under the different discharging conditions including constant discharge rates and dynamic discharge rates for flying cars. Under the condition of the flying cars, the battery maximum temperature appears at the end of takeoff stage, while the maximum temperature difference appears during the forward flight segment. Moreover, different FHP heat dissipation structures are studied to further improve the battery thermal performance. The configuration with the best performance is adopted for the battery pack, and it can meet the heat dissipation requirements of the pack at a discharge rate of 3C or that of flying cars. Finally, the influence of inlet cooling air velocity and temperature on battery thermal performance is investigated. According to the research results, air velocity has little effect on the battery maximum temperature at the discharge rate of flying cars, but it can obviously affect the temperature decrease rate. Besides, the battery maximum temperature and its temperature difference develop linearly with the air temperature.

Design and performance analysis of hot side heat sink of thermoelectric cooler device based on simulation and experiment

“…In this way, the high heat conductivity of local modules can be simulated without affecting the heat transfer of other component components. According to the data provided by the manufacturer and referring to previous related studies, [36][37][38] the equivalent thermal conductivity of the flat heat pipe is set to 2000 W/(m•K).…”

Modeling and Model Predictive Control of a Battery Thermal Management System Based on Thermoelectric Cooling for Electric Vehicles

“…[8,9] Furthermore, inadequate heat dissipation may precipitate a rapid increase in internal battery temperatures, thereby elevating the risk of thermal runaway and posing a severe threat to personal safety. [10,11] Therefore, the implementation of thermal safeguards for batteries assumes paramount significance and necessitates urgent attention and resolution to promote and advance the application of new energy vehicles.…”

Inverse Heat Transfer Analysis Method to Determine the Entropic Coefficient of Reversible Heat in Lithium-Ion Battery

“…Along with the development of cutting edge techniques based on machine learning, studies on predicting thermal state of the battery under normal conditions but also at extreme situations like thermal runaway are being introduced [3]. Above all, studies on the battery thermal management system (BTMS) have received a lot of attention that BTMSs using heat passive systems such as phase change material [4] and heat pipe [5], integrated with the classical active cooling systems, are being actively introduced. As such, a variety types of studies have been conducted on the performance and safe use of the battery system, and they are all closely related to the battery thermal behavior.…”