Even a parked electric vehicle needs to detect unusual battery-cell conditions. Hyundai and Kia describe a second power path for wireless battery-management communication. US application US20260307508A1 was published on October 8, 2026. The approach aims to eliminate an additional voltage converter without completely losing monitoring when the primary supply fails.
An existing chip provides backup power
Cell-monitoring units send status data wirelessly to the central battery-management unit. Its communication bridge contains two independent circuit dies. A DC/DC converter powers one; a system basis chip, already conditioning vehicle voltage for other components, powers the other. Before entering sleep mode, the controller checks the primary supply. If it is faulty, a timer is configured: The backup chip wakes periodically, powers the remaining communication path and enables cell-status polling. The other end of the link is configured accordingly. Backup operation therefore provides periodic checks, not uninterrupted wireless readiness.
The original document covers two power paths in independent claim 1. Claims 10–13 and paragraphs [0068]–[0075] describe the timer, backup path and cell polling.
Redundancy requires tested failure scenarios
The document contains no measured reductions in quiescent current, cost or space. Demonstrated detection times and fire-prevention tests are also missing. The described sequence checks the supply before sleep mode; it does not automatically cover every fault occurring later. Fault testing, safe wake-up intervals and common causes that could affect both power paths would be decisive.
Document and status
Original title: “Wireless Battery Management System Having a Power Redundancy Structure and a Method for Operating the Same”. Applicants: Hyundai Motor Company and Kia Corporation; US application 19/337,600, filed September 23, 2025; claimed priority KR 10-2025-0044672 dated April 7, 2025. A1 denotes a published application, not a grant. We could not independently confirm the current official prosecution status on October 10, 2026.
Pandorex View: Reusing existing power-management electronics is the interesting part. The potential benefit is a simpler backup structure. Reliability under real faults cannot be inferred from the circuit concept alone.