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TIDA-00792: Reduced cell count

Hemavathi S
Prodigy 150 points
Part Number: TIDA-00792
Other Parts Discussed in Thread: BQ76940, BQ78350-R1, BQ78350, BQ34Z100-G1

Dear sir

I referred TIDA-00792 for the design of the 48V battery management system. The maximum cell count of this design is 15S.

1. I need to use this design for 13S. Please ensure that what are the changes I need to do in the design

2. How many numbers of cells I can connect in parallel (max. Ah) for this design.

Regards

Hemavathi

  • 0
    TI__Guru* 77333 points

    Hi Hemavathi,

    The BQ76940 datasheet has a section that shows how to connect the cells for reducing the cell count (see Table 26). There is also a TI Reference Design that is 13S - you can use this as a reference for connecting 13 cells: http://www.ti.com/tool/TIDA-010030

    The maximum value of the Design Capacity parameter in the BQ78350-R1 data flash is 32767mAh. However, if you upgrade the BQ78350-R1 with the BQ78350-R2 firmware (available here: http://www.ti.com/tool/BQ78350-R2-DEVICE-FW), then you can use the IPSCALE feature to scale by a factor of 10 or 100.

    Best regards,

    Matt

  • 0 in reply to Matt Sunna
    Prodigy 150 points

    Dear Matt Sunna

    Thank you for your information.

    I need a suggestion and solution for below 

    1. We are involving to develop our own algorithm for SOC. For this case, is it possible to use bq76940 for primary protection? and, Can you please recommend fuel gauge IC and MCU for incorporating this algorithm.

    2. How to implement CAN communication in this

    Regards

    Hemavathi

  • 0 in reply to Hemavathi S
    TI__Guru* 77333 points

    Hi Hamavathi,

    Yes, the BQ76940 can be used as a primary protector. The BQ78350 companion controller is also a battery gauge using a CEDV algorithm. An MCU can be used if you want to develop your own gauging algorithm, but I cannot provide guidance on how to develop this since our gauging algorithms are proprietary. You can select an MCU that meets the needs of your system (maybe you want to search for an MCU that can do CAN communication), or you can select an MCU from one of the TI reference designs below.

    For questions on the CAN communication device, I suggest starting a new E2E question on this device if you need help. This question will then be assigned to the experts for this device.

    http://www.ti.com/tool/TIDA-010030  - uses an MSP430 MCU, a BQ34Z100-G1 battery gauge (uses Impedance Track algorithm), and includes CAN communication device.

    http://www.ti.com/tool/TIDA-00792  - uses BQ78350-R1 as the controller and gauge

    http://www.ti.com/tool/TIDA-00449 - uses MSP430 controller. Includes example code

    Best regards,

    Matt