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How to check the change of Ra table value is reasonable?

user68921447
Intellectual 360 points
Other Parts Discussed in Thread: BQ27541-G1

I update the BQ27541-G1 chemistry with ID 2077, Ra table in the data flash changed as below 

Question 1: So update chemistry ID not only update the OCV table but also the Ra table, is this right ?

Cell0 R_a 0 = 88
Cell0 R_a 1 = 98
Cell0 R_a 2 = 111
Cell0 R_a 3 = 138
Cell0 R_a 4 = 151
Cell0 R_a 5 = 97
Cell0 R_a 6 = 109
Cell0 R_a 7 = 110
Cell0 R_a 8 = 96
Cell0 R_a 9 = 80
Cell0 R_a 10 = 104
Cell0 R_a 11 = 88
Cell0 R_a 12 = 130
Cell0 R_a 13 = 386
Cell0 R_a 14 = 1873

After learning cycle for golden, it changed as below

Cell0 R_a 0 = 90
Cell0 R_a 1 = 100
Cell0 R_a 2 = 109
Cell0 R_a 3 = 127
Cell0 R_a 4 = 145
Cell0 R_a 5 = 102
Cell0 R_a 6 = 115
Cell0 R_a 7 = 122
Cell0 R_a 8 = 115
Cell0 R_a 9 = 120
Cell0 R_a 10 = 123
Cell0 R_a 11 = 167
Cell0 R_a 12 = 828
Cell0 R_a 13 = 2475
Cell0 R_a 14 = 12000

Question 2: Cell0 R_a 11~14,  have much larger values than the default of selected chemistry. Is this reasonable? 

Question 3: what is the unit of the value in the Ra table?

  • 0
    TI__Guru* 76230 points

    Hi Sean

    1. That is correct.. programming the chem id programs the OCV and resistance tables.

    2 Those values look normal. The resistance of most batteries is significantly higher at closer to the end of discharge.

    3. This is contained in the technical reference manualsheet. The unit is 2^-10 ohm

    thanks

    Onyx