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ST's BMS controller is highly accurate, enabling better lithium-ion performance and longer battery life

Update time : 2023-04-10 10:08:25

ST's L9961 battery management system (BMS) chip gives systems market-leading detection accuracy and flexibility, improving the performance and safety of Li-ion and Li-polymer batteries and extending battery life.

Suitable for battery packs up to 25V, the L9961 monitors, equalizes and protects batteries in a variety of applications requiring high energy density lithium batteries. Cordless power tools, backup energy storage systems, uninterruptible power supplies, portable and semi-portable devices, and medical devices can all benefit from the L9961's advanced features.
Among the many features built into the L9961 are dual high and low-side configurable pre-drivers that control the pack's safety relays; embedded non-volatile memory that holds configuration data, eliminating the need for the microcontroller to rewrite data to the controller each time the system starts up; and an I2C interface that handles system configuration and host controller communication, transferring battery state of charge (SOC) and state of health (SOH) data.
Thanks to the high-resolution analog-to-digital converter (ADC) and current-sense amplifier, the L9961 detects cell voltage to within ±15mV and cell current to within 0.25%. Accurate measurements enable highly accurate passive cell voltage equalization and coulomb counting functions, and support safety functions such as overvoltage undervoltage detection, equalization undervoltage protection, overcurrent detection, and short-circuit discharge protection. With an external thermistor, the L9961 can monitor pack temperature, including overheat/underheat monitoring, and manage pack fuses. the L9961 is highly resistant to change and supports hot swapping.
While extending battery life and improving safety, the L9961 is also very energy efficient, drawing very little power from the battery pack. It has two power-saving modes, deep sleep and standby, with current consumption down to 2μA in deep sleep mode and on-chip regulator in standby mode, which facilitates the chip to resume operation quickly with current consumption down to 5μA.

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