Texas Instruments Adds EIS Technology to 26-Cell Battery Monitor
Texas Instruments has introduced the BQ79826Z-Q1 battery monitor with an integrated EIS engine and support for up to 26 series-connected cells. The device delivers less than 2 mV voltage accuracy, supports ASIL-D functional safety requirements, and targets EV and energy storage battery management systems.
The BQ79826Z-Q1 is a battery monitor used to measure and manage battery cells in EV and ESS applications. The device combines cell monitoring, diagnostics, and impedance measurement functions on a single chip.
Integrated EIS Engine
A key feature of the BQ79826Z-Q1 is its integrated electrochemical impedance spectroscopy engine. EIS is used to measure the electrical response of a battery cell and can provide information about cell condition, state of charge, and state of health.
TI states that the integrated EIS engine can identify fault conditions from inside battery cells and provide earlier visibility into issues that may lead to thermal runaway. The same technology can also be used to monitor battery condition in stationary energy storage systems.
According to TI, EIS measurements on the BQ79826Z-Q1 are completed five times faster than previous solutions.
26-Cell Monitoring Capability
The BQ79826Z-Q1 supports monitoring of up to 26 cells per device. TI states that this is eight more cells than competing solutions and represents a 44% increase in channel count compared to previous generations.
The higher channel count allows more cells to be monitored by a single device, reducing the number of monitoring ICs required within a battery pack.
The device can also be paired with TI's BQ79881-Q1 pack monitor and an optional communications bridge to support different battery module sizes and pack architectures.
Voltage Accuracy And Functional Safety
TI specifies voltage accuracy of less than 2 mV across an operating temperature range of -40°C to +125°C. The device also incorporates higher-resolution analog-to-digital converters and low-noise measurement circuitry.
The BQ79826Z-Q1 is designed to support Automotive Safety Integrity Level D requirements and ISO 26262 functional safety standards.
TI states that the combination of voltage measurement, EIS diagnostics, and battery monitoring functions provides detailed information on individual cell condition and battery pack operation.
Development Support And Availability
Preproduction quantities of the BQ79826Z-Q1 are available now through TI. Production quantities are expected by the end of 2026.
Development support includes evaluation modules, reference designs, and additional design resources intended for battery management system development.
View the BQ79826Z-Q1 datasheet
Learn more and read the original announcement at www.ti.com
Technology Overview
The BQ79826Z-Q1 is a battery monitoring IC that supports up to 26 series-connected cells and integrates an electrochemical impedance spectroscopy engine. The device provides voltage monitoring with less than 2 mV accuracy across -40°C to +125°C and supports ASIL-D and ISO 26262 functional safety requirements.
Frequently Asked Questions
How many cells can the BQ79826Z-Q1 monitor?
The device supports monitoring of up to 26 series-connected battery cells.
What is the purpose of the integrated EIS engine?
The EIS engine measures battery cell impedance and provides information related to cell condition, state of charge, and state of health.
Which applications is the BQ79826Z-Q1 intended for?
TI identifies electric vehicle battery management systems and energy storage systems as target applications
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