US firm unveils 26-cell battery monitor that detects faults before batteries fail

Semiconductor maker Texas Instruments has introduced a new battery monitoring chip designed to give electric vehicles and energy storage systems earlier warning of battery failures while reducing the number of components required inside battery packs.
The company announced the BQ79826Z-Q1 on Tuesday, calling it the industry’s highest-cell-count battery monitor with an integrated electrochemical impedance spectroscopy (EIS) engine. The device is designed to provide real-time insight into battery health and detect conditions that could lead to failures such as thermal runaway.
The new monitor supports up to 26 battery cells per device, allowing engineers to track more cells with fewer monitoring chips. According to TI, the device can monitor up to 44 percent more channels than previous-generation solutions, helping reduce system complexity, board space requirements, and overall battery pack costs.
The launch comes as automakers and energy storage developers look for ways to improve battery safety, extend battery life, and lower system costs while scaling production of EVs and large-scale storage systems.
Early fault detection
A key feature of the BQ79826Z-Q1 is its integrated EIS engine. The technology measures a battery’s electrochemical behavior in real time, giving engineers a view into changes occurring inside individual cells.
“Just as an electrocardiogram (EKG) monitors the heart, EIS monitors a battery,” the Dallas-based company said in a release.
The company says the technology can identify fault conditions earlier than conventional monitoring approaches by detecting changes from within battery cells. This could help battery management systems flag safety risks before they develop into more serious issues.
“The electrification of transportation and the rapid expansion of energy storage are redefining what battery performance must deliver, and as a leader in battery management technology, TI is uniquely positioned to meet that challenge,” said Wenjia Liu, vice president and general manager of battery management systems at TI.
Liu added that the technology helps “shine a light” inside battery cells and provides chemical-state data that software can use to make real-time decisions on battery safety and performance.
Fewer chips required
Beyond safety, TI says the higher cell count could simplify battery pack architecture. By supporting 26 cells per device, the monitor can reduce the number of monitoring components needed across a battery pack.
The company claims the chip supports eight more cells than competing solutions, enabling designers to lower bill-of-material costs while maintaining reliability.
The monitor can also be paired with TI’s BQ79881-Q1 pack monitor and communications bridge, allowing developers to use the same architecture across different battery chemistries, module sizes and mechanical designs.
TI says the device delivers voltage accuracy of less than 2 mV across temperatures ranging from -40°F to 257°F. The company also claims its EIS measurements are five times faster than previous solutions, helping improve state-of-charge calculations and battery health monitoring.
The BQ79826Z-Q1 complies with Automotive Safety Integrity Level D requirements and ISO 26262 functional safety standards. TI is showcasing the technology at the Power Conversion, Intelligent Motion Expo and Conference (PCIM) 2026 in Nuremberg, Germany.