This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ27426: For high temperature environments, TI provides new Fs files, want to know what has been modified?

Part Number: BQ27426
Other Parts Discussed in Thread: BQSTUDIO,

Hello!

我们在高温75度环境下,测试出现SOC跳变,TI上海FAE提供了针对高温环境的Fs文件,我们对比后有如下疑问,需要您的支持:

1、Design Capacity设置偏小的理由是什么?如果设置与电池容量一致,会有什么现象?

2、CC Offset这个参数变更的原因?为了适配高温环境做的修改吗?

3、文档中罗列了变更点:除了CC offset和Taper Voltage两个参数以外,其它参数都和之前配置差不多。

请问,哪些参数是针对高温环境进行的修改?

4、Ecmm_2389文件能适用于常温、低温和高温三种场景吗?如果不能适用,需要如何修改、适配?

We test in high temperature 75 degrees environment, SOC jumping, TI Shanghai FAE provides Fs files for high temperature environment, we have the following questions after comparison and need your support.

1、What is the reason for the small Design Capacity setting? If the setting is consistent with the battery capacity, what phenomenon will there be?

2. What is the reason for changing the parameter CC Offset? To adapt to the high-temperature environment to make changes?

3. The document lists the change points: except for CC offset and Taper Voltage, all other parameters are similar to the previous configuration.
May I ask which parameters are modified for high-temperature environment?


4. Can the Ecmm_2389 file be applied to normal, low and high temperature scenarios? If not, how do I need to modify and adapt it?

ChemID&Fs file_Comparison and Analysis.xlsx

fs files.zip

  • I don't have information why the TI Shanghai FAE suggested changes to Design Capacity. Please ask the TI Shanghai FAE directly through your contact who provided the FS files.

    In general, high temperature tuning changes private (they are not documented intentionally) adjustment tables that control how the gauge models cell behavior hence you will not see these changes in a change list (not will you see them in the Data Memory window in bqStudio as they are hidden). 

    I worked with TI China on the ECMM high temperature tuning. The main problem that I noticed was that the .gm.fs file that I got from TI China showed that the configuration file wasn't used properly. I provided instructions to TI China internally how these files must be used for the bq27426 (which requires a specific procedure that I can't discuss on E2E). Please work with TI China on obtaining this procedure.

  • Thanks for you reply

    Does the configuration file refer to the chem ID data?

    In practice, we load the Chem ID data first, and then load the fs file after gold learning.

    Before using, it will determine chem id = 0x2389.

    During use, it will read back periodically to confirm that the register value in DataMemory.

    So there is no configuration error in the configuration file.

    Please also help to reconfirm the question in the previous question, Thanks again!

  • The process is correct in principle but if anything isn't done correctly, it will not work. I cannot discuss this in detail on public E2E. Please work directly with the local FAE.