Contribution to energy and resource saving society by on-road power supply for EVs (Second report)

Yuki Konno･Naoya Kato･Tetsuji Mitsuda･Keisuke Tani･Hayato Sumiya･Hiroko Yahata･Koji Yamaguchi (DENSO)

In order to contribute to carbon neutrality, we aim to reduce the battery capacity to 1/3 or less as a means of reducing carbon emissions when manufacturing battery of electric vehicles. At the FY25 JSAE, we announced the specifications of the on-road power supply for a heavy-duty vehicle with 1/3 battery. In this case, we clarified the conditions under which long-distance continuous driving is possible by moving the subject to urban areas.

Benchmarking Bidirectional On-Board Chargers via Power-Architecture and Control-Method Characterization: Towards V2X Applications

Kuntal Mandal･Xavier Genaro-Munoz･Edgar Zahonero-Zahonero･Javier A. Corea-Araujo (IDIADA Automotive Technology)

This paper outlines a workflow for calibrating and validating on-board charger (OBC) benchmark methodologies by instrumenting and measuring accessible input and output waveforms. The approach enables reproduction of under voltages, voltage distortions, instantaneous breakdowns, transient lows, and AC-side fluctuations, including harmonic composites. The key contribution is the identification of hardware architecture and control method to support performance enhancement, robust operation under extreme grid conditions, and evaluation of bidirectional capability. The analysis focuses on understanding OBC control impact on V2G, V2L, V2V, V2B and V2H configurations. Standard test signals and harmonic analysis characterize modulation and control methods for exploring design improvements for future high-efficiency and grid-interactive bidirectional chargers.

Development of a Virtual Frequency Impedance Analysis-Based Pre-Safety Diagnostic Technology for Battery Systems

HYUNJUN JANG･MINJUN PARK･TAEKYU KANG･WOOSUNG KIM (Hyundai Motor)･JIYOUNG YOON･HYEJEONG OH･JONGMIN LEE (SEOUL NATIONAL UNIVERSITY)

This paper presents a novel approach for the diagnosis of abnormal battery cells in the battery system using virtual frequency impedance analysis. The proposed method utilizes digital signal processing techniques to estimate the frequency impedance of individual battery cells based on the data generated during vehicle charging and driving sessions, without requiring additional hardware.

Toward accurate energy efficiency assessment of lithium-ion batteries : a polarization characteristics-based approach

Hyunjun Jo･Daegun Jin (Hyundai Motor)

This paper proposes a method to accurately measure lithium-ion battery energy efficiency from partial charge-discharge cycles by considering polarization effects, enabling faster yet reliable evaluations for electric vehicle applications.