TIDUFD1 March   2025

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Highlighted Reference Designs
      1. 2.2.1 TIDA-010279
      2. 2.2.2 TIDA-010272
      3. 2.2.3 TIDA-010253
  9. 3Design and Documentation Support
    1. 3.1 Design Files
      1. 3.1.1 Schematics
      2. 3.1.2 BOM
    2. 3.2 Documentation Support
    3. 3.3 Support Resources
    4. 3.4 Trademarks
  10. 4About the Author

2 System Overview

A BMU is responsible for the cell voltage and temperature sensing and cell balancing. The HMU is responsible for monitoring the voltage and current of the battery pack, controlling the relays, and performing insulation detection. A BCU is responsible for the SOC calculation and external communication of the battery cluster, and processes all data in a unified manner.

In Figure 2-1, the three boards are connected as a whole in the following manner:

  • Voltage and temperature information collected by the BMU are transmitted to the BCU board through universal asynchronous receiver-transmitter (UART) or daisy chain.
  • High-voltage and insulation sampling information detected by the HMU is transmitted to the BCU through the SPI or daisy chain.
  • BCU calculates and processes the signals from HMU and BMU boards, and provides outward RS-485, CAN, and Ethernet communication interfaces.