Lukhanin O. Mathematical models and computational methods for the analysis of the air cooling system efficiency inside Li-ion batteries package.

The paper considers the processes of three-dimensional heat propagation in Li-ion batteries when cooled by air flow. In work mathematical models of thermal processes are offered at cooling by an air stream of Li-ion batteries, having on the surfaces of elements a complex multi-channel structure. The characteristics of the necessary parameters of the air flow of the thermal management system of Li-ion batteries were determined. The spatial fields of temperature, pressure, and velocities in the air flow have been comprehensively studied when cooling Li-ion batteries with multichannel structures on the surfaces of the elements, which makes it possible to improve the efficiency of cooling systems. A mathematical model for cooling a Li-ion battery using a heat pipe and a method for calculating its thermal conductivity have been developed; The stand was designed for experimental research of the efficiency of battery cooling systems, simulators of Li-ion batteries and a camera for investigating the efficiency of the cooling system of Li-ion batteries. Scientific results were obtained during the implementation of the programs of the NSC KIPT and the joint project of the NSC KIPT with BNL (USA): "Investigation of physical processes and optimization of the parameters of research facilities by mathematical modeling methods" (No.0111U009294) "Fundamental and applied research in nuclear physics for the needs of medicine, Ecology and Energy" (No.0111U009298), a joint project of the NSC KIPT with BNL (USA)" Development of a prototype of the Li-ion battery thermal stabilization system "(BNL-T2-371-UA). The introduction of mathematical models, numerical methods, methods of measurement and data processing is confirmed by a certificate of their use in the NIC "Accelerator" NSC KIPT. The results obtained can be widely used in the development of electric vehicles, new scientific and industrial equipment.