Delve into an in-depth exploration of the battery protection unit, protection topologies, short circuit protections, protection functionalities, and solutions. Our application engineer will provide a comprehensive overview of the key features and capabilities of the range of products available, as well as provide practical insights into how to integrate with connected devices.
Overview
With lithium-ion now standard for backup, the battery management system (BMS) is the control point for safety, availability, and lifetime value. It must enforce safe charge/discharge limits, isolate faults quickly, and deliver accurate SoC, SoH, and RUL data. Overcharge, deep discharge, shorts, and inrush can escalate fast—causing thermal incidents and cutting pack life—so architecture and component choices must reflect real fault energy and interconnect inductance, not just nominal pack voltage.
Don't miss this technical discussion of Infineon's telecom battery management system (BMS), including design guidance for safe, efficient lithium-ion backup in base stations and server rooms. We'll cover BMS functions — cell monitoring, protection, and control — highlighting fault handling (over/under-voltage, over-current, thermal runaway), balancing for capacity utilization, and wired/wireless architectures (centralized, master-slave, modular). In addition, we'll detail protection switch topologies (high/low side), MOSFET configurations (common source/drain, separate charge/discharge paths, pre-charge), and key selection criteria: low RDS(on), tight VGS(th) spread for current sharing, wide SOA for inductive transients, low transconductance, thermal performance.
Key Takeaways
- Safe Charging Assurance: Telecom BMS must ensure safe charge/discharge by monitoring cell voltage, current, and temperature, executing fast fault disconnects to prevent thermal runaway and maximize battery life and uptime.
- Architecture-Balancing Alignment: Architecture selection (centralized vs. master-slave, wired vs. wireless, high-side vs. low-side protection) should match power/voltage needs, with cell balancing (active/passive) essential to unlock full pack capacity and performance.
- Robust MOSFET Selection: MOSFET selection is critical -- prioritize low RDS(on), tight VGS(th) spread for parallel sharing, wide SOA for inductive transients, robust avalanche ratings, and package thermals (e.g., TOLL/TOP-side cooling) to handle high pulse currents and reduce device count.
Speaker
Raviprakash is a technical expert in Battery Power applications. He joined Infineon Technologies in 2022 and has consolidated over ten years of experience in power electronics and control circuit design. During his time here, he has been actively involved in designing and testing support and parts for BMS designs from the Infineon product portfolio.