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BQ34Z100-G1: Golden image integration

vincent Philippart
Prodigy 130 points
Part Number: BQ34Z100-G1
Other Parts Discussed in Thread: BQ34Z100, BQ34Z100EVM, EV2400, BQSTUDIO

Hello,

I have several questions regarding the BQ34Z100-G1 evaluation module, more specifically on integrating the calbration/golden image on higher scale volumes.

  1. Is it recommended to determine the battery pack characteristics characteristics on the BQ34Z100EVM or with the product using the BQ34Z100 itself?
  2. Once the calibration, learning cycle etc is done with the EV2400 on a single product, can this golden image accurately be used on all other products and programmed with a STM32? In other words, is calibration required on each of the products or will once suffice?
  3. Due to mechanical constraints we cannot apply a temperature sensor directly to the pack in the final product (for safety however, other measurements are done). Is it possible to only use the temperature sensor during the qualification process to create the golden image and use that golden image and the chip internal temperature sensor onwards?

Thanks!

  • 0
    TI__Mastermind 25955 points
    Hi Vincent,

    1. Although the logging to determine the chemID can be performed with the bq34z100-G1 and bqStudio, other higher precision loggers (e.g., Arbin, Maccor) may also be used. The better the log, the better the potential chemID match. If there isn't a sufficient chemID match with logging, the cell may be characterized by TI.
    2. Yes, assuming the same battery in the same condition (e.g., new). Yes, it is possible to use the temp sensor during the chemID match process and the internal temp sensor in the design. The chemID match is to identify the chemistry of the cell. Error may potentially increase with the internal sensor if placement does not monitor temp of the battery as well as an externally placed sensor, but this is not linked to using an external temp sensor when matching chemID and internal in production. In using internal temp sensing in production, please make sure to place the device close to the cells to measure the temp of the cells and not ambient temperature.

    Sincerely,
    Bryan Kahler