Battery monitor combines EIS with high cell count
TI’s BQ79826Z-Q1 automotive battery monitor supports up to 26 cells in series and is stackable to 128 devices. Its integrated electrochemical impedance spectroscopy (EIS) engine detects early signs of thermal runaway inside battery cells, helping improve safety and performance in EVs and energy storage systems.
The BQ79826Z-Q1 combines real-time diagnostics with predictive battery monitoring to help extend battery life. According to TI, the 26-channel chip delivers the highest cell-count monitoring in its class, tracking up to 44% more channels than previous generations. The higher channel count can reduce the number of monitoring devices and associated components required in a battery pack.
With voltage accuracy of less than 2 mV across the full -40°C to +125°C temperature range and a dedicated ADC for each channel, the BQ79826Z-Q1 enables more accurate state-of-charge and state-of-health estimation. These measurements can improve EV range prediction while supporting battery performance and longevity. EIS measurements are up to five times faster than those of previous devices, enabling more frequent battery diagnostics and earlier detection of cell degradation.
Preproduction quantities of the BQ79826Z-Q1 are available on TI.com, with production expected by the end of 2026.
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