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Original question:

Can multi-chemistry bq parts detect chemistry?

BQ79616-Q1: Capability of bq79616 for Multi-Chemistry BMS Design: Support for Additional Chemistries and Necessary Modifications

Batuhan Yavasoglu
Prodigy 220 points
Part Number: BQ79616-Q1
Other Parts Discussed in Thread: BQ79616

Dear Ti experts,

Can the bq79616 support multi-chemistry in a BMS design, allowing for a universal solution where only the software needs to be updated when changing chemistries?

Can you confirm whether the bq79616 IC is capable of supporting multiple battery chemistries in a BMS design, such as NMC, LFP, LTO? If so, what modifications to the software or hardware might be necessary to support these additional chemistries?

Furthermore, can you provide guidance on best practices and any necessary testing and validation procedures that should be followed when designing a BMS using the bq79616 to support multiple battery chemistries? For example, what specific parameters should be considered for each supported chemistry, and how can these be accommodated in the BMS design and testing process to ensure proper functionality and protection?

Thanks & Regards,

Batuhan Yavasoglu

  • +1
    TI__Expert 8705 points

    Hi Batuhan,

    The major difference of multi-chemistry cells for 616 is their cell voltage range and accuracy requirements. From 616 perspective, the difference is not a big deal, they are all supported. From your system perspective, you have to assess if the input cell voltage range and related accuracy of 616 matches your system. Many customers are using 616 for NMC or LFP,  I am not sure if there is any customer designs LTO but technically 616 supports it as well. There is only one major difference from software perspective is that the OV/UV thresholds are different. 

    And I suppose you are not monitoring mixed chemistry cells in one BMS, but only designing a universal BMS to monitor one of them.  

  • 0 in reply to Wayne Liu
    Prodigy 220 points

    Thank you for your answer,

    Yes I will use NMC and LFP.

    So, if i design a bms for LFP with 616, it can also be used for NMC batteries on the same hardware just by changing the software? 

    Do i understand correctly? If so, it is simpler than I expected awesome!