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Original question:

BQ40Z50: BQ40Z50 RSOC jump in low temperature

BQ40Z50: SOC jump 44% to 100%

Gabriel Wang1
Genius 4715 points
Part Number: BQ40Z50

Dear Sir

We have encountered the following problems in the project using BQ40Z50-R1. Please help to analyze them.

Recently, the customer complained about the battery SOC jump in the system, as shown in the figure below. Before it was 44%, it suddenly jumped to 100%, and after a few seconds, it returned to 44%. 

The client reads the RSOC value from the relative state of charge and processes the display. After checking the aging data of batteries in the factory, it is found that sometimes there are abnormal fluctuation points in the data, as shown in the figure below. The volatility, though short-lived, was hundreds of times higher than normal and would certainly have had an impact on customers' data. Attached is the original data for analysis. Please check with TI FAE to see if this fluctuation is normal. What are the causes? Is there any way to avoid or suggest?

G_COM29___DESKTOP-57JJKN6_20220611153648#029_2.xlsxG_COM29___DESKTOP-57JJKN6_20220611164621#029_3.xlsxG_COM29___DESKTOP-57JJKN6_20220612093706#029_5.xlsx

  • 0
    TI__Guru** 105760 points

    Hello Gabriel,

    This looks like the host system may be reading the data incorrectly for random samples. I would apply some filtering on your readings so this isn't shown to the end customer. With smoothing enabled RSOC will not jump around in the ways that were described in this post.

    Sincerely,

    Wyatt Keller