Solution for Electrochemical Impedance Spectroscopy (EIS) in Battery Management System

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A battery management system chipset, with Electrochemical Impedance Spectroscopy (EIS) enabled, brings a classical laboratory technology to the in-vehicle use. This solution consists of three gateway devices, to synchronize devices and transfer data; the cell module controller to measure voltage and voltage based component response; and the junction box controller to measure the current and current based excitation frequency component. NXP’s new devices provide the benefits of EIS in chip packages that can be directly exchanged on the cell module and battery junction box (BJB) control units.

Block Diagram

BMS EIS Block Diagram

BMS EIS Block Diagram
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Supported Devices

Power Management

12 V, 24 V, and 48 V SBC Solutions

  • FS26: Safety System Basis Chip with Low Power, for ASIL D Systems

Processors and Microcontrollers

S32K Auto General-Purpose MCUs

  • S32K3: S32K3 Microcontrollers for Automotive General Purpose

Battery Management

Battery Communication ICs

  • BMX6X02: General-Purpose BMS Communication Gateway and EIS Synchronization Controller

Battery Sensors

  • BMA8420: Battery Junction Box Monitor IC with EIS Capability
  • TAA3033: TAA3033 Active Precharge Controller IC

Battery Cell Controllers

  • BMA7418: 18 Channel Li-Ion Battery Cell Controller IC ASIL D with EIS

Interfaces

CAN Partial Networking

  • TJA1145A: High Speed CAN Transceiver with Partial Networking, CAN FD Data Rates up to 5 Mbit/s

Features

Hardware Used Synchronization

  • The EIS Chipset features a hardware based synchronization algorithm, making comparison of impedance data across the whole pack possible

Frequency Range

  • A wide frequency range 0.1 - 1 kHz for measurement of different effects is available, spanning from solid diffusion all the way to internal short circuit assessment

Excitation Calibration Mechanism

  • A dual Fourier transform current measurement integrated in the BJB device, enables precise calibration of the excitation

Documentation

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Related Hardware

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4 hardware offerings

Software

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Note: For better experience, software downloads are recommended on desktop.

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