Other Parts Discussed in Thread: GPCRB
Hello Sir:
Our customer mentioned the RSOC jumped when doing the temperature cycle testing, and we would like to check with TI the change percentage of RSOC are normal or not? The following is the tested data.
Test condition:
The battery pack is placed in a low temperature and high temperature cycle at about 30% of the capacity and the RSOC is recorded
Low temperature conditions: -25°C
High temperature conditions: 60℃
Test process:
battery room temperature (RSOC31%) →
cooling down to -25°C (RSOC23%) →
standing for 2hr →
heating up to 60°C (RSOC31%) →
standing for 2hr →
returning to room temperature (RSOC34%) →
standing for more than 5hr
The test data is drawn into a curve as shown in the figure below: (The attached file is RSOC test.xls and log data)
According these curves FCC and RSOC were updated every five degrees, and RSOC% will recalculate after FCC and RC updated. When room temperature the RSOC is about 31%, when -25 degree the RSOC is about 23%. When the temperature rise to 60 degree the RSOC is about 31%, and the last the temperature returned to room temperature and let is stand for more than five hours the RSOC is about 32%.
There were two questions which needs your help.
- How can we tell customer that RSOC update is normally? Which parameters can let customer know which calculation RSOC is correct?
- Please help us to check the GG files, and please let us know your recommendations.
By the way that we are using BQ40z50-R1, Panasonic NCR18650F battery cell, Chem ID choice NCR18650F-20C(ID 2142) to build the golden learning file.
Please let us know your recommendations.
Thanks a lot.
