Getting Started with the HVBMSCT800BUN Reference Design Bundle

2.1 Board Features

• Scalability: high-voltage BMS chipset solutions for a wide range of applications to reduce development cost and enable faster time to market
• Safety: high system safety capability ensures proper operation of the battery at all times, protecting the passengers
• Precision: precise and synchronized measurements enable to leverage the full potential of the battery thus maximizing driving range
• Enablement: for each of the boards included in the enablement kit, hardware schematics, PCB layouts and Gerber files will be available on the NXP website for download (NDA required) and a system software development suite is available

2.2 Bundle Description

The RD-HVBMSCT800BUN is an ETPL-based high-voltage battery management system (HVBMS) reference design bundle for 800 V applications. This bundle has been designed for evaluation and development purposes. The RD-HVBMSCT800BUN is composed of a hardware kit and several software packages.

2.3 Bundle Components

Battery Management Unit

The battery management unit (BMU) is the control part of the battery management system (BMS). The BMU processes the data, makes decisions, and commands the system.

The RD-K358BMU is the HVBMS reference design BMU for 800 V applications. This BMU kit includes a power supply and three cables to interface with other parts of the HVBMS.

Figure 1. RD-K358BMU Interfaces

Figure 1. RD-K358BMU Interfaces

Figure 2. RD-K358BMU Cables

Cell Monitoring Unit

The CMU is the cell-sensing part of the BMS. The CMU precisely monitors cell voltages and environmental temperatures to ensure safe battery operation. The CMU also enables fast cell-balancing.

The RD33774CNT3EVB is the HVBMS reference design CMU for ETPL-based architectures based on the MC33774A battery cell controller. This CMU kit includes four cables to interface with other parts of the HVBMS.

Figure 3. RD33774CNT3EVB Interfaces

Figure 3. RD33774CNT3EVB Interfaces

Figure 4. RD33774CNT3EVB Cables

Battery Junction Box

The battery junction box (BJB) is the pack-level sensing part of the BMS. The BJB measures high voltages. This measurement allows monitoring connections of the contactors to the inverter and the charger. The BJB also precisely measures the system’s current, and monitors the battery to chassis isolation.

The RD772BJBTPL8EVB is the 800 V HVBMS reference design BJB for ETPL-based architectures. This BJB kit includes eleven cables to interface with other parts of the HVBMS.

Figure 5. RD772BJBTPL8EVB Interfaces

Figure 5. RD772BJBTPL8EVB Interfaces

Figure 6. RD772BJBTPL8EVB Cables

Battery Emulation

To emulate cell voltages and temperatures, the RD-HVBMSCT800BUN contains a BATT-18EMULATOR battery emulator.

Figure 7. BATT-18EMULATOR Interfaces

Figure 7. BATT-18EMULATOR Interfaces

3.1 Configure the Hardware

To connect and power-up the system, complete the following steps:

• Connections of the boards
  • Unpack all boards and cables from the kit
  • Connect the multipurpose cable to the RD-K358BMU (J1)
  • Connect the CMU
    • Connect the first ETPL cable to the RD-K358BMU (J2) and the RD33774CNT3EVB (J2_1)
    • Connect the second ETPL cable to the RD-K358BMU (J3) and the RD33774CNT3EVB (J2_3)
    • Connect the three supply cables to the RD33774CNT3EVB (J1_1, J1_2, and J1_3) and the BATT-18EMULATOR (J4, J5, and J6)
  • Connect the BJB
    • Connect the ETPL cable between the RD-K358BMU (J4) and the RD772BJBTPL8EVB (J9)
    • Connect the BJB supply cable between the RD-K358BMU (J1, 4-pin connector, pins 11 to 14) and the RD772BJBTPL8EVB (J12)

      Figure 8. RD-HVBMSCT800BUN Boards Connection

      

      Figure 8. RD-HVBMSCT800BUN Boards Connection

      
• Powering the boards
  • Power the CMU by powering the BATT-18EMULATOR using the provided power supply (J3)
  • Power the BMU by connecting the provided power supply to the multipurpose cable end
• Monitoring the system using the HVBMS Start-up interface
  • Open the HVBMS Start-up FreeMASTER project (HVBMS_800_StartUp_FreeMASTER.pmpx)
  • Connect the provided USB-TTL cable to the RD-K358BMU (J8), ensuring the black wire is on GND, yellow is on TX, and orange is on RX.

    Figure 9. USB-TTL cable Connection on RD-K358BMU

  • In the FreeMASTER menu, click Tools and then Connection Wizard...
  • In the Connection Wizard window:
    • Click Next.
    • Select Use direct connection to onboard USB port and click Next.
    • Select the correct USB serial port and select 115200 as baud rate to probe and click Next.
    • Select Yes, use the detected port settings and start using FreeMASTER tool and click Finish.
  • In the FreeMASTER menu, click Go! or click Connect in the interface.
• Programming the system

To install the development setup and start programming with the HVBMS reference design, refer to the software section of the RD-HVBMSCT800BUN website.