Selected design parameters of a thermal management system for a lithium-ion phosphate battery

Federal State Budgetary Institution of Science United Institute of High Temperatures, Russia

Abstract

In order to provide a theoretical assessment of the thermal regime of the thermal regime system (SOT) of a heat-generating lithium-iron-phosphate battery, a thermal physico–mathematical model of the thermal regime system of this one has been developed, including the use of axial heat pipes, which, due to their high heat transfer capacity, transmit and divert thermal power from the device to a remote radiator - radiator. The thermal physico-mathematical model is constructed by the method of isothermal nodes (the method of concentrated parameters) and includes 4 ordinary differential equations of thermal balance, which corresponds to 4 isothermal nodes. As these nodes, the following are selected: a lithium–ion heat–generating battery, a remote radiator - radiator, as well as evaporative and condensing sections of heat pipes that work cyclically on the principle of evaporation – condensation of the coolant. This model is solved by the Runge –Kutta method of 4 orders of accuracy with linearization of the radiant-convective heat flow relative to the temperature taken from the previous time layers. Based on the developed model, the problem of optimizing the design parameters of the SRT, such as the outer diameter and the number of ATTS, is solved. The conjugate directions method was chosen as the minimization method, as the most accurate gradient method of the 1st order of optimization.