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BQ77307: Request for Technical Support: Development of 2S BMS with Comprehensive Protections

Mohd Sahid
Prodigy 70 points
Part Number: BQ77307

Tool/software:

Dear Texas Instruments Support Team,

I hope this message finds you well.

I am currently working on designing a Battery Management System (BMS) for a 2S 2P lithium-ion battery pack with the following specifications and protection requirements:

Project Details

  • Battery Configuration: 2S2P
  • Nominal Voltage: 7.2V
  • Maximum Charging Current: 4A
  • Maximum Discharging Current: 2A
  • Protections Required:
    • Overvoltage (OV)
    • Undervoltage (UV)
    • Overcurrent (OC)
    • Short Circuit Protection
    • Reverse Polarity Protection
    • Over-temperature Protection

Design Preferences

I am looking for a solution that:

  1. Does not require coding or microcontroller-based communication for operation.
  2. Relies on standalone ICs with built-in or configurable protections.
  3. Supports external component configurations to meet the protection requirements.

I am considering using the BQ77307 or a similar IC for this application. However, I would appreciate your assistance with the following:

  1. Guidance on selecting the most suitable TI BMS IC for a standalone implementation that supports all the above protections.
  2. Recommendations for external components (MOSFETs, resistors, capacitors, thermistors, etc.) to ensure a reliable and efficient design.
  3. Availability of any reference designs or evaluation boards to accelerate development.
  4. Any design or application notes specifically for 2S lithium-ion battery management.

Your expertise and insights would be invaluable in helping me achieve a robust and compact BMS solution.

Thank you in advance for your support. I look forward to your guidance.

Best regards,
Mohd Sahid

  • 0
    TI__Expert 8915 points

    Hello Mohd,

    The BQ77307 should have most of what you’re looking for.

    We don’t have parts that support reverse polarity protection as our parts are designed with the assumption that it is a part of the battery pack.

    For the BQ77307, if you do not want coding or microcontroller-based communications for operations, you can either use the default settings it has, or if you do want to change it permanently, you would need to request TI to program the OTP, however, there would need a significant business case.

    Unfortunately, we do not have any specific design or application note for 2S battery management with our parts. You can, however, use the BQ76905 EVM as reference to help with the process when using the BQ77307.

    Best Regards,
    Alexis