Texas Instruments (TI) has launched the industry’s highest-cell-count battery monitor featuring an integrated electrochemical impedance spectroscopy (EIS) engine. The new solution is designed to deliver predictive insights, detailed data, and real-time diagnostics for battery management in electric vehicles (EVs) and energy storage systems (ESS).
The BQ79826Z-Q1 battery monitor improves safety and helps extend battery lifespan by identifying early signs of cell-level failures. As a single-chip solution, it supports up to 44% more monitoring channels than earlier generations, enabling the highest cell-count capability in its category. This expanded capacity also reduces the number of components needed in a battery pack, lowering system complexity and overall cost while maintaining reliability. TI is presenting this technology at the 2026 Power Conversion, Intelligent Motion (PCIM) Expo and Conference in Nuremberg, Germany, from June 9–11.
“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, battery management systems (BMS) at TI. “Our high-cell-count battery monitor with a built-in EIS engine helps ‘shine a light’ inside battery cells, delivering rich chemical-state data that enables systems’ software to make informed, real-time decisions on safety and performance of the battery pack, allowing engineers to address the most critical challenges in battery management.”
Delivering safety and performance with EIS technology
Just as an electrocardiogram (EKG) monitors the heart, EIS monitors a battery. It delivers continuous, real-time insight that reveals the battery’s health and warns of issues before they become critical. Integrated EIS technology enables the BQ78926Z-Q1 to detect fault conditions earlier – from inside the cells – helping maintain safety and notifying passengers of potential vehicle hazards such as thermal runaway.
These same benefits extend to ESSs, where reliable battery monitoring is critical to meeting the growing power demands of artificial intelligence data centers. As effective storage solutions become increasingly vital in the grid-to-gate ecosystem, EIS gives engineers real-time visibility into the state of charge and state of health of each battery cell, regardless of system size.
Maximizing efficiency with industry-leading cell count
The performance of an EV or ESS is fundamentally affected by the quality and efficiency of its batteries. The BQ79826Z-Q1 supports up to 26 cells per device, eight more than any competing solution, setting a new industry standard. Fewer monitoring devices means a lower bill of materials, simplified architecture and reduced board space requirements, translating to meaningful cost savings per channel without sacrificing quality or reliability.
When paired with the BQ79881-Q1 pack monitor and optional TI communications bridge, these devices create a powerful chipset that works across different module sizes, battery chemistries and mechanical designs, giving engineers the flexibility to design once and deploy everywhere. This scalability reduces engineering overhead and accelerates time to market for automotive and energy storage designers.
Calculating charge readings with the best-in-class accuracy
With a voltage accuracy of <2mV across a full temperature range of –40°C to +125°C, higher resolution analog-to-digital converters and ultra-low noise, the BQ78926Z-Q1 enables more accurate state-of-charge calculations, directly addressing one of the biggest concerns for EV drivers: range anxiety. Utilizing EIS technology, this device enables more accurate temperature and state-of-charge estimation, helping designers achieve longer battery life and faster charging without compromising battery health. With an EIS measurement time that is five times faster than previous solutions, this device delivers the highest functional safety voltage reading per cell. Compliance with Automotive Safety Integrity Level D and International Organization for Standardization 26262 gives designers a smarter, more efficient path to safer, longer-lasting batteries.
For more information on the BQ79826Z-Q1, see technical article “Enabling the next phase of battery intelligence.”
Innovating what’s next in power at PCIM 2026
Visitors to PCIM can see new products and solutions from TI that are enabling engineers to innovate what’s next in power in Hall 7, Booth No. 652. The new BQ79826Z-Q1 battery monitor will be featured in an EIS-enabled BMS reference design, alongside other innovations such as an 11kW single-stage bidirectional onboard charger, a 50kVA solid-state transformer cell stack with Ethernet and Fast Serial Interface communication and short-circuit protection for silicon carbide power metal-oxide semiconductor field-effect transistors with technology from Flex.
Availability
- Preproduction quantities of the BQ79826Z-Q1 battery monitor with integrated EIS engine are now available on TI.com, with production quantities expected by the end of 2026.
- To support designers, complete development support including evaluation modules and reference designs are available.
