Texas Instruments (TI) has unveiled an EIS integrated battery monitor that diagnoses the battery status of electric vehicles and energy storage systems (ESS) in real time. It supports up to 26 cells per unit, reducing the number of monitoring components required for battery pack design and focusing on early detection of internal cell anomalies.

TI Korea announced on the 10th that it has launched the 'BQ79826Z-Q1' battery monitor, which integrates an electrochemical impedance spectroscopy (EIS) engine. TI will showcase the product at PCIM 2026, held in Nuremberg, Germany from June 9 to 11, by including it in an EIS-supported BMS reference design.

The BQ79826Z-Q1 is a product that adds EIS-based diagnostic capabilities to existing monitoring functions for checking the voltage and temperature status of battery cells. EIS is a technology that identifies the internal state of a cell by analyzing changes in the battery's internal impedance, and is used to detect abnormal signs that are difficult to identify using only voltage or current information.

Battery management systems are directly linked to electric vehicle driving range, charging stability, and ESS operational reliability. Particularly in high-capacity battery packs, variations in the condition of individual cells can lead to performance degradation or safety issues, making precise cell-level diagnostic capabilities increasingly important. The growing demand for ESS driven by the proliferation of AI data centers is also increasing the need for battery condition management technology.

According to TI, the BQ79826Z-Q1 can monitor up to 26 serial cells per device. This represents up to 44% more channels than the company's previous generation products, and TI explained that it supports eight more cells than competing solutions. Reducing the number of monitoring devices reduces the number of components and board area within the battery pack, and simplifies the system structure.

Accuracy and functional safety are also key features. This product provides voltage accuracy of less than 2mV over a temperature range from -40°C to +125°C. It also offers EIS measurement times five times faster than existing solutions and supports the ASIL-D level based on ISO 26262, the international standard for automotive functional safety.

TI stated that using the BQ79826Z-Q1 in conjunction with the BQ79881-Q1 pack monitor and communication bridge enables support for various battery module sizes, chemical compositions, and mechanical designs. This allows electric vehicle and ESS manufacturers to design multiple battery pack configurations based on the same chipset, thereby reducing the burden of development.

In addition to the BQ79826Z-Q1, TI will also unveil an 11kW single-stage bidirectional onboard charger, a 50kVA solid-state transformer cell stack, and SiC power MOSFET short-circuit protection technology at the PCIM 2026 exhibition. Pre-production volumes of the BQ79826Z-Q1 are currently available for order on TI.com, and mass production products are scheduled to be supplied starting in late 2026.