Tool/software: Code Composer Studio
Before, I post my questions, I want to state battery states in my application.
Battery will be set up on board that is put on shelf for 2 two years at 25C, which is storage state. In this stage, there is small leakage current about 0.2mA.
Then board with battery will put in system for 5 years . Battery is charged to full at 4.2V, and loses 5% (decreases to 4.1V) because of about 10mA leakage current. Charger will charge back it to 4.2V. This shallow depth of discharge will continue over 5 years. When we use battery to store data, battery will discharge 1 minute with 2A, frequency of which is about once a year. Ambient temperature of battery is about 50C. That is active state for battery.
Deadband of our FW is 68, and I don't use smoothing function for SOC. RM= unfiltered RM, FCC= unfiltered FCC, soc =true soc.
So my questions are like below:
1,,Can unfiltered RM indicate current capacity of battery whenever in storage or active state? How much accuracy separately?
Can unfiltered RM reflect current capacity of battery even if battery loses some capacity over 5 years?2
2, FCC@25C means full charge capacity at 25C with load of 'SOH loadI '. Is it right? Is FCC@25C same as unfiltered FCC whenever in storage state or active state?
3, In active state, could 'SOH*design capacity' indicate full capacity of battery at 50C accurately? How much accuracy?
4,In storage state, could 'SOH*design capacity' indicate full capacity of battery at 25C accurately? How much accuracy? Do you think resistance and qmax will update?
As you shown in another loop, 'True SOC (unfiltered SOC) will get adjusted based on OCV while in storage. This adjustment will account for for the 0.2mA current, such that even though the couloumb counter discards that, the OCV/DOD measurements will adjust SOC to reflect battery discharge due to self discaharge of the cell. Unfitered SOC will be correct while in storage.'
True soc = unfiltered RM/unfiltered FCC.
When true soc is correct, unfiltered RM and unfiltered FCC will be also correct, which is caused by resistance and Qmax update during storage state? Am I right? These updates will result in SOH update. is it right?
5,Can unfiltered FCC indicate full capacity of battery whenever in storage or active state? How much accuracy separately?
Can unfiltered FCC reflect full capacity of battery over 5 years?
Thanks very much!
I will appreciate your quick response!
