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

1 System Description

Currently, battery energy storage systems (BESS) play an important role in residential, commercial and industrial, and grid energy storage and management. These systems are developing towards high-precision monitoring, predictive protection, intelligent management, and are environmentally sustainable.

A BESS contains several battery packs and each pack consists of battery cells in a matter of series and parallel connection. The battery packs and cells require a proper working and storage temperature, voltage range, current range for life cycle and safety. The designer must monitor and protect the battery cell at the pack level. A battery management unit (BMU) is a controller that monitors the voltage and temperature of each battery cell in the pack and high measurement accuracy is required. The high-voltage monitor unit (HMU) part of a BMS is a critical component that focuses on managing and maintaining the safety of the high-voltage aspects of a battery rack.

The information collected by the BMU and HMU is transmitted to the rack-level controller battery control unit (BCU) for safety and charging management. A robust and fast-speed communication is also required between the BMU and the BCU. For the communication interface, a controller area network (CAN) is traditionally and widely used for robustness of communication. However, a daisy chain shows an advantage in cost especially in high-capacity battery pack applications where cost is a concern for a CAN structure which consists of many BMU nodes and CAN interface devices.

Combining the BMU, BCU, and HMU designs make this architecture a whole BESS system for high-capacity battery pack applications which can be applied in residential, commercial and industrial, and grid energy storage systems.