Monitoring of high-voltage battery operations using OBD diagnostics device in hybrid vehicle

Khairunsam, Nur Ain Hassanah (2025) Monitoring of high-voltage battery operations using OBD diagnostics device in hybrid vehicle. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Hybrid Electric Vehicles (HEVs) rely in high-voltage batteries to optimize performance and sustainability. Effective monitoring of these batteries is crucial for maintaining safety, efficiency, and longevity. The On-Board Diagnostic II (OBD-II) system offers real-time data for analysing vehicle components, including high-voltage batteries. Despite advancements in OBD-II technology, its application in comprehensive monitoring of high-voltage batteries remains unexploited. This limitation leads to inadequate battery health insights, premature failures, and inefficient maintenance strategies. This study employs an OBD-II device integrated with the Hybrid Assistant application to monitor the high-voltage battery of a Toyota Prius 3. Key parameters such as temperature, state of charge (SOC), and charge/discharge current limits were assessed under different modes and conditions, including ECO and SPORT modes. Findings reveal that battery performance and thermal stability vary significantly between driving modes. ECO mode prioritizes energy efficiency, while SPORT mode emphasized performance, with distinct impacts on SOC and temperature parameters. These observations underscore the critical role of adaptive monitoring in optimizing battery health. The integration of OBD-II devices with data analysis tools enables real-time insights into high-voltage battery behaviour, enhancing operational efficiency and lifespan. Future improvements in diagnostic systems could further refine battery management for HEVs, promoting cost effective and reliable performance.

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