Thermal Mechanism Analysis Of PHEV Critical Components

In the last few decades, concern over the dependence and ever-increasing prices ofimported oil and environmental pollution as well as global warming have led to activeresearch on vehicles with alternative energy sources. Because of recent enhancements inbattery technology in terms of energy density, cost, and size, the Electric Vehicle (EV) andHybrid Electric Vehicle (HEV) technologies have improved significantly and challengedthe conventional vehicles in many areas. Although EVs and PHEVs have considerableadvantages, they still have certain shortcomings such as relatively long charging times,limited range, and lower efficiencies under extreme temperatures that prevent thewidespread commercialization of these vehicles. Thermal management of Electric Vehicle(EV) and Plug-in Hybrid Electric Vehicle (PHEV) are one of the key components ofelectric and hybrid electric vehicles to achieve high vehicle efficiency and performanceunder all operating conditions. Current improvements in electric motor, Power Convertorand battery technology allow vehicles to have relatively long ranges, fast acceleration, andlong life while keeping low-maintenance costs and considerably lower emissions.However, the Electric Vehicle (EV) and Plug-in Hybrid Electric Vehicle (PHEV)performance are significantly affected by the problems of temperature increasing on itscomponents (Motor, Power Convertor, Battery packages) during operating conditions.Moreover, the cell life cycle, safety, and possibility of thermal runaway significantlydepend on peak temperature rise and temperature uniformity of the battery, a hightemperature can damage the insulation and may cause demagnetization of permanentmagnet of an air-cooled motor. Therefore, various Thermal Management Systems arecreated to keep the components of EV/HEV (Battery, Motor, and Power) within idealoperating ranges. They offer solutions to the key issues related to today s conventionalvehicles by having lower operating costs and significantly lower emissions (virtually zeroemissions for EVs) without much extra cost.In this thesis we focus on the thermal Mechanism Analysis of PHEV CriticalComponents to transient heat generation during their operation. The modeling is based onIntegral-transform technique, Green’s function technique and Electrochemical that gives aclosed-form solution for the fundamental problem of heat conduction in battery cores withorthotropic thermal conductivities. Thermal management systems (TMS) are one of the key components of electric and hybrid electric vehicles to achieve high vehicle efficiency andperformance under all operating conditions. Current improvements in electric batterytechnology allow vehicles to have relatively long ranges, fast acceleration, and long lifewhile keeping low-maintenance costs and considerably lower emissions. However, thevehicle performance is significantly affected by the battery operating conditions. Finally,we compared the results of Simulation and thermal analysis of Permanent MagnetSynchronous Motor (PMSM) and show a comparison between the measurements oftemperature and simulation predictions. To predict a Permanent Magnet SynchronousMotor (PMSM) temperature, we linked the results of electromagnetic field analysis withboth LP thermal analysis and3D FEM thermal analysis. The motor used in the electrictractor is PMSM without cooling system.