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Question regarding how a ChemID is selected?

Andy Vu
Intellectual 550 points

Hi,

When we submitted our cell data to TI to get the ChemID, I was wondering how the data is processed?

Our cell data is discharged at C/10 rate with the corresponding Voltage profile but no OCV table.  Obviously the ChemID

also has the same C/10 profile but it also has the OCV table among other things such as Temperature related data.

So I guess the logic is if our cell C/10 profile is closely matched to the ChemID cell C/10 then it should

mean that our cell OCV table should closely resemble that of the ChemID OCV table?  Then the ChemID OCV table

will be used to calculated and update our cell RA table?

Also will our cell OCV table get modified to get the exact match of our cell?  Or OCV table will forever be fixed to

the original ChemID OCV table?

Thanks.

  • 0
    TI__Guru 73830 points
    The characterization process uses several discharge profiles and temperatures, but the details are proprietary. The gauge will use the resistance tables to compensate for the gap between the OCV and voltage under load curves to predict the capacities. C/10 is a good discharge rate to use in calculating the initial Ra table values and the resistances will get updated with your load profiles as you use the pack.