Industrial BMS controllers for lithium battery packs
from portable devices to light e‑Mobility
Why advanced BMS matters – and how ST solves the challenge
Designers must deliver long lifetime, strong safety and low standby consumption in compact up to 10 cell lithium‑ion and lithium‑polymer packs, from portable tools to light e‑Mobility. ST addresses these challenges with two scalable BMS controllers: L9961 for 3‑5 cells and L9962 for 4‑10 cells, built on three pillars: high‑accuracy sensing, high integration & protection, and low power.
Power tools
Gardening tools
Home appliances
Urban mobility
Three pillars of ST’s BMS controllers
- Precise cell voltage sensing: high accuracy measurement for reliable state of charge and state of health estimation.
- Low current measurement error: down to 0.25% after calibration for accurate current monitoring.
- Integrated cell monitoring, balancing, current sensing, and temperature sensing
- Integrated relay/MOS drivers, pack fuse management, and safety protections
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Two BMS controllers, total flexibility
L9961: Compact efficiency
Optimized for 3–5 cell Li-ion packs. It features 15mV accuracy and ultra-low power consumption. Ideal for drones, power tools, and portable backup systems.
L9962: High-power precision
Designed for 4–10 cell stacks. It offers 7.5mV accuracy and advanced safety for high-energy use. Ideal for e-bikes, light EVs, and industrial systems.