EIS-powered chipset improves EV battery monitoring
NXP’s battery management chipset integrates electrochemical impedance spectroscopy (EIS) to enable lab-grade vehicle diagnostics. The system comprises three devices: the BMA7418 18-channel Li-Ion cell controller, BMA6402 communication gateway, and BMA8420 battery junction box monitor. Together, they deliver hardware-based synchronization of all cell measurements within a high-voltage battery pack with nanosecond precision.
By embedding EIS directly in hardware, the chipset supports real-time, high-frequency monitoring of battery health. Accurate impedance measurements, combined with in-chip discrete Fourier transformation, help OEMs manage faster and safer charging, detect early signs of degradation, and simplify overall system design.
EIS sends controlled excitation signals through the battery and analyzes frequency responses to reveal cell aging, temperature shifts, or micro shorts. NXP’s system uses an integrated excitation source with a pre-charge circuit, while DC link capacitors provide secondary energy storage for greater efficiency.
The complete BMS solution is expected to be available by the beginning of 2026, with enablement software running on NXP’s S32K358 automotive microcontroller. Read more about the chipset here.
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