Texas Instruments has released the BQ79826Z-Q1, a new battery management system component designed to enhance the safety and reliability of large-scale stationary energy storage. The device integrates electrochemical impedance spectroscopy directly onto the silicon, allowing for active diagnosis of lithium iron phosphate cell health rather than relying on passive voltage monitoring.
Standard battery management systems typically estimate cell condition by measuring voltage against a curve. This method often carries significant margins of error, particularly for lithium iron phosphate chemistries which feature an extremely flat voltage curve in their mid-range state of charge. Distinguishing between temporary state of charge fluctuations and permanent chemical degradation can be difficult with traditional voltage readings alone.
The new chip addresses this by injecting an alternating current perturbation to measure internal impedance across multiple frequencies. This process creates a precise electrical model for each cell, separating state of charge from permanent aging factors such as lithium plating. Henrik Mannesson, general manager of grid infrastructure and power delivery at Texas Instruments, stated that the technology allows developers to bypass bulky add-on diagnostic hardware.
By outputting raw chemical-level data directly, the chip enables system designers to run proprietary algorithms without necessarily licensing specialized third-party software. To ensure measurement accuracy despite external noise from wiring or connectors, Texas Instruments is providing reference designs, evaluation modules, and graphical user interfaces to help engineers establish clean physical setups before conducting thermal tests.
The component features a 26-channel design, which supports the industry transition toward larger battery architectures. This integration aims to improve the bankability of energy storage systems while reducing overall complexity and costs. Commercial systems utilizing this technology may become available in 2027.
