NXP Semiconductors has announced a battery management system (BMS) chipset with integrated electrochemical impedance spectroscopy (EIS), featuring hardware-based nanosecond-level synchronization across all battery cell measurements in a high-voltage EV battery pack. According to NXP, this marks the first time lab-grade EIS diagnostics are available directly within a vehicle’s embedded BMS, targeting improved tracking of battery health, charging safety and system simplicity for EV manufacturers.
The new BMS solution integrates EIS measurement into three hardware units: the BMA7418 cell sensing device, BMA6402 gateway, and BMA8420 battery junction box controller. NXP says that this arrangement allows real-time, high-frequency monitoring of battery cells without the need for additional external sensors or complex redesigns. Precise hardware-based synchronization enables accurate impedance measurements, using in-chip discrete Fourier transformation, to help detect early battery degradation and optimize charging processes.
The chipset’s EIS functionality is based on controlled electrical excitation signals processed throughout the battery assembly. NXP claims that this system includes an excitation signal generator which pre-charges the high-voltage circuit and employs the DC link capacitors for secondary energy storage, enhancing energy efficiency during analysis. Measuring responses across varying frequencies allows identification of gradients, aging effects, or micro short circuits within individual cells—granularity that traditional time-based monitoring methods may miss.
With a planned availability by early 2026, the new BMS chipset supports EV applications and will run enablement software on the NXP S32K358 automotive microcontroller. Aimed at both high-voltage EV battery packs and stationary energy storage systems, this solution is designed to help automakers monitor battery health, manage fast charging, and streamline system architecture.
“The EIS solution brings a powerful lab-grade diagnostic tool into the vehicle. It simplifies system design by reducing the need for additional temperature sensors and supports the shift toward faster, safer and more reliable charging without compromising battery health. The chipset also offers a low-barrier upgrade path, with pin-to-pin compatible packages that can be directly upgraded to on cell module and battery junction box control units,” said Naomi Smit, VP and GM, Drivers and Energy System, NXP Semiconductors.
Source: NXP Semiconductors
