The automotive industry is increasingly focusing on electrification and automation, raising the safety requirements on vehicle energy supply systems in terms of integrity and availability. Automotive safety standards like ISO 26262 and ISO 21448 (SOTIF - Safety of the Intended Functionality) are pivotal. SOTIF primarily addresses automated vehicles, offering guidelines to ensure safety despite functional uncertainties. These principles are also applicable to vehicle energy supply systems. The current project aims to integrate ISO 26262 and SOTIF, defining interfaces to enable a holistic safety assessment of vehicle energy supply systems.