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BMS solution recommendation inquiry (10s ~ 20s design possible)

Grady Lee
Genius 3815 points
Other Parts Discussed in Thread: BQ25756, TIDA-01093, ISO1541, ISO1050, MSP430G2955, BQ76930, BQ76930EVM, BQ76940

Hi, TI expert.

A customer has an inquiry about recommending a BMS solution (10s ~ 20s design possible)

[Application]
1) 14s and 20s BMS solution for battery pack 2~4KWh design for e-motor bike
2) CAN IF to communicate with MCU for e-motor bike must be supported.

Please recommend a suitable solution.

Thank you.

  • 0
    TI__Prodigy 490 points

    Hi Grady,

    What is the battery chemistry? Will the input be USB?

    Thanks,

    Chloe

  • 0 in reply to Chloe (BCP) Wang
    Genius 3815 points

    Hi, Chloe

    I will answer as below

    1. What is the battery chemistry?

    → Li-on battery

    2. Will the input be USB?

    → Not USB. It use a large-capacity battery charging terminal.

        Use decicated CCCV charger,  ex) voltage 48V,72V class, current min ~ current max 1C charge

    Please check. Thank you.

  • +1 in reply to Grady Lee
    TI__Prodigy 490 points

    Hi Grady,

    We currently do not have any charger ICs that can support 14S or 20S li-ion batteries. However, we will release a device BQ25756 in 3Q that can support 14S li-ion. 

    Best regards,

    Chloe

  • 0 in reply to Chloe (BCP) Wang
    Genius 3815 points

    Hi, Chloe

    I have an additional question regarding the BMS solution recommendation inquiry that I inquired above.
    Below are some of the TI data found by customers in the past.

    ( 14S )

    ( 20S )

    Here, the 2 parts are still confirmed as Active.

    Q1) Can you confirm whether development review is possible by applying the part below?

    - 14S: 48V, BQ79614
    - 20S: 72V, BQ79652 + BQ79612 + BQ79600

    [application]
    - 14S, 20S BMS solutions for designing 2~4KWh battery packs for electric bicycles
    - CAN IF must be supported to communicate with the EV MCU.
    - Lithium battery
    - Input: Large-capacity battery charging terminal.

    Please check. Thank you.

  • 0 in reply to Grady Lee
    TI__Expert 4465 points

    HI Grady, 

    Yes, you are correct. Both 14S and 20S will work with the configuration above for battery monitoring and protection. 

    Best regards, 

    Arelis G. Guerrero 

  • 0 in reply to Arelis Guerrero
    Genius 3815 points

    Hi, Arelis G. Guerrero

    These are the two TI Seminar-based introductory materials that you mentioned in your question above that you said were available.

    BMS solutions for 48-V and 400-V/800-V EV/HEV batteries

    The customer has further inquiries.

    For further inquiries, I checked on TI.com and found TIDA-01093 (Industrial Battery Management Module for 20S Applications Reference Design).
    The customer asks if it is possible to proceed with development with TIDA-01093 data.

    TIDA-01093 reference design | TI.com

    Q1) Is it possible to develop 20S with the configuration below?

    - Configuration: BQ76930x2 + ISO1541 + MSP430G2955 + ISO1050 CAN TRx

    [application]
    - 20S BMS solutions for designing 2~4KWh battery packs for electric bicycles
    - CAN IF must be supported to communicate with the EV MCU.
    -Lithium battery
    - Input: Large-capacity battery charging terminal.

    Q2) Where can I get purchase information and support SW for a demo board with this configuration?

    Please check. Thank you.

  • 0 in reply to Grady Lee
    TI__Expert 4465 points

    Hi Grady, 

    Q1) Yes, you can develop the 20S configuration following the TIDA-01093. All design files are available for download https://www.ti.com/tool/TIDA-0109. 

    Q2) This TIDA is not an orderable part number, design files are available so the customer can build the board if needed, or use it as a starting guide for their application design. For evaluating the BQ76930 device, you can order BQ76930EVM  https://www.ti.com/tool/BQ76940EVM and download the evaluation software. You can also find more design resources and some sample code on the product page https://www.ti.com/product/BQ76940 

    Regards, 

    Arelis G. Guerrero 

  • 0 in reply to Arelis Guerrero
    Genius 3815 points

    Hi, Arelis G. Guerrero

    The link given above https://www.ti.com/tool/TIDA-0109 does not open. www.ti.com/.../TIDA-01093 Is it a typo?

    BQ76930 (6 to 10-series cell), BQ76940 (9 to 15-series cell) are listed in the datasheet. Is it correct that 20 series Cell is possible with this part?

    Please check. Thank you.

  • +1 in reply to Grady Lee
    TI__Expert 4465 points

    Hi Grady, 

    Yes, apologize it is a typo. It should be https://www.ti.com/tool/TIDA-01093

    Yes, as you are stacking 2x BQ76930 (2x 10-series cell), that'll give you the 20-series cells needed. You can also do a BQ76940 in a 10-s configuration. 

    Regards, 

    Arelis G. Guerrero