Integration of advanced battery management systems

STMicroelectronics and industrial integrators are collaborating to implement advanced battery management systems for portable equipment and light electric vehicles. This technical integration focuses on deploying the L9962 integrated circuit to optimize battery performance and ensure operational safety in demanding environments.

Operational Challenges and Collaboration
The industrial and medical sectors require highly stable power sources for portable equipment to prevent battery degradation and ensure continuous operation. To address these structural demands, STMicroelectronics partners with equipment manufacturers to integrate specialized battery management infrastructure. This cooperation provides manufacturers with a standardized pathway to optimize lithium-ion and lithium-polymer battery packs, reducing the need for extensive external circuitry while enhancing system reliability.

Technical Solution and Responsibilities
The technical architecture is centered on the L9962 lithium-battery management integrated circuit, designed for packs with up to ten series-connected cells. STMicroelectronics engineers the silicon, which integrates a 12-bit analog-digital converter and a high-accuracy current-sense amplifier utilizing Coulomb counting. The system provides a cell-balancing current of 70mA and includes a 3.3V low-dropout regulator to power external components. Integrators utilize the provided I2C interface to configure device parameters, such as voltage-measurement intervals, and to extract state-of-charge and state-of-health data.

Deployment and Implementation
The deployment of these management systems occurs within compact embedded environments, including cordless power tools, e-bikes, and backup energy storage units. During the manufacturing and implementation phase, engineers calibrate the current-measurement accuracy with a single point on the production line, achieving 0.25 percent accuracy across the full temperature range. The physical integration utilizes a programmable loop time to continuously measure individual cell voltages, activating built-in protection mechanisms upon detecting threshold deviations.

Applications and Use Cases
This battery management technology is applied directly to portable medical devices, light electric vehicles, and uninterruptible power supplies. Functional use cases involve detecting excessive charge and discharge currents, executing short-circuit discharge protection, and performing ratiometric thermal monitoring via an NTC thermistor. Applying this architecture stabilizes voltage alignment across the battery stack and maximizes runtime through power-saving modes, including a 5-microampere standby and 2-microampere deep-sleep configuration for products in transit.

Results and Expected Impact
The integration of the L9962 circuit significantly minimizes the required engineering overhead and external component count for custom battery packs. By combining precise cell-balancing with continuous plausibility checking, the system ensures rapid voltage correction and extends overall battery health. The technical implementation secures robust operational stability for industrial and consumer end-users, maintaining voltage-measurement accuracy across the full operating-temperature range.

Edited by Maria Brueva, Induportals editor – adapted by AI.

www.st.com