A Framework for Assessing the 2^nd Life Potential of End-of-Life Electric Vehicle Power Electronics for a More Circular Economy

This study proposes a framework for assessing the usability of end-of-life automotive traction converters for stationary applications like grid-tied inverters in micro-grids. This is especially important in low-income countries where the cost of new components may be prohibitive. Studies like this are already at advanced stages for Electric Vehicle (EV) batteries, however, very few exist for power electronic converters. Repurposing power converters for stationary applications can also address the problem of electronic-waste from end-of-life EVs. Power converters used in automotive traction applications undergo a thermo-mechanical mission profile that results in packaging degradation which is manifested as an increase in the thermal impedance of the package due to die-attach delamination, solder voiding and/or base-plate degradation. It is customary to consider a module with 20% higher thermal impedance as no longer useable due to reduced energy conversion efficiency from higher junction temperatures. However, these converters may still be capable of service under de-rated conditions. This paper proposes a method through which 2nd life usability can be assessed.