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https://www.radioradar.net/en/news_of_electronic/nuvoton_ka85010ua_26_cell_battery_ic_eis.html

Nuvoton KA85010UA Battery Monitoring IC Uses EIS to Check Cell Health

Nuvoton Technology is sampling the KA85010UA, a 26-cell battery monitoring IC that integrates electrochemical impedance spectroscopy (EIS). The device enables in-system battery degradation diagnosis, state-of-health (SOH) estimation, lifetime prediction and early detection of abnormal cell conditions without requiring external laboratory equipment.

Key Characteristics

• Cell support: up to 26 cells
• Core feature: integrated electrochemical impedance spectroscopy (EIS)
• Measurement method: inductor-based EIS (uses two FETs + inductor)
• Thermal advantage: reduces PCB temperature rise by approximately 93% compared with conventional resistor-based EIS methods
• Supports battery degradation diagnosis and SOH estimation
• Enables lifetime prediction and early detection of abnormalities
• Measurements possible during battery operation, charging and rest
• High correlation with dedicated EIS equipment and IEC 62620 AC internal-resistance method
• Validated in joint research with AIST Group (results published in IEEE paper)

The inductor-based approach circulates energy stored in an inductor to generate the alternating measurement current, avoiding the significant heat generated when high currents are passed through a resistor. Evaluation examples include a 72 V pack with 1.5 A superimposed current and a 60 V pack with 0.7 A.

Target Applications

• Automotive battery packs
• Energy storage systems (ESS)
• Battery management systems requiring advanced cell health diagnostics

By embedding EIS capability directly into the monitoring IC, the KA85010UA allows continuous, in-system assessment of cell health without the need for specialized external instruments.

Source: Electronics For You