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The current status of battery reuse for xEVs will be presented with an overview of the circular economy and automotive recycling, and then projects and case studies related to automotive battery reuse will be shared on the challenges to promote reuse. The history of the Automobile Recycling Law, which was born out of the Teshima issue, as an initiative toward a recycling-oriented society. Past efforts related to Design for Environment and Life Cycle Assessment (LCA), auto parts reuse, and efforts to improve the quality of auto recycling. In addition, there are approaches to xEV battery reuse from the perspective of demonstration projects, etc., and approaches to xEV battery reuse by private companies, etc., from which issues for realizing a circular economy can be seen.

In the evaluation of insulation materials for motor windings, there have been no effective methods for evaluating insulation properties at high temperatures and high electric fields, and it has been difficult to find even a guideline for improvement. Based on our experience in investigating the insulation properties of polymeric insulating materials used as motor winding coating materials at high temperatures and high electric fields over many years, we present examples of measurement methods and typical measurement results that we believe are effective. This is necessary to evaluate the insulating properties of polymeric materials and involves high electric field properties of polymeric insulating materials. Examples of insulation evaluation by the current integral charge method (Q(t) method) and by the Q(t) method. Space charge accumulation property evaluation by the pulse electrostatic stress method (PEA method), with an example of observation of space charge accumulation behavior by the PEA method and an example of characterization of motor winding coating materials.

In “The Role of Motor Winding and Its Relation to Characteristics (EV Shift Consideration),” what is happening in the motor? There is a lack of understanding of the role of various parameters that affect its characteristics and their influence on the characteristics. It is important to explain the principles and basics of motor operation in a way that is understandable. For example, an overview of motors from an EV perspective and an introduction to brushless motor kits. In-depth discussion of parameters and windings that determine motor characteristics. Actual winding demonstration and kit motor operation demonstration are examples.