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BQ27426: The difference of QMAX is huge on the units that are using BQ27426 for 12000mAh battery

user5776633
Prodigy 30 points
Part Number: BQ27426
Other Parts Discussed in Thread: GPCCHEM

Hi,

Why is the QMAX highly different on two units with 12000mAh battery

This is log data for unit #1: QMAX is 6924mAh

                                                                       SOC  Volt     AverageCurrent RemainingCapacityFilter RemainingCapacityUnfilter     FCCFilter     FCCUnfilter      QMAX

<6>[ 658.459902] bq27x00-battery 1-0055:   100   4170   -815                     9993                                  4737                                      10292              4881             6924


This is log data unit #2: QMAX is 12000mAh

                                                                       SOC Volt      AverageCurrent RemainingCapacityFilter RemainingCapacityUnfilter       FCCFilter      FCCUnfilter     QMAX

<6>[ 44.039884] bq27x00-battery 1-0055:     100   4101    -753                   9807                                8254                                           8646               8487             12000

  • 0
    TI__Guru* 76230 points

    hi , 

    Are these two packs the same capacity? You will need to attach a log and gg file extracted from both units showing the problem. Run a full charge and discharge cycle on both units while logging. This will allow us understand what is going on

    thanks

    Onyx

  • 0 in reply to Onyx Ahiakwo
    Prodigy 30 points

    Hi, Onyx

    Yes, the two packs have the same capacity of 12000mAh. 

    I attach the logs that record the discharging case from the full charge capacity. After about 3 hours discharging under the same setting, the left soc for one pack is 11%, while the other is 49%. 

    The gm.fs file is also attached for your reference.

    0458.1.xlsx7801.2.xlsx

    Fullscreen gzns18650_12000mAh.gm.fs.txt Download 
    ;--------------------------------------------------------
;Verify Existing Firmware Version
;--------------------------------------------------------
W: AA 00 01 00
C: AA 00 26 04
W: AA 00 02 00
C: AA 00 02 02
;--------------------------------------------------------
;SET_CFGUPDATE
;--------------------------------------------------------
W: AA 00 13 00
X: 1100
;--------------------------------------------------------
;Data Block
;--------------------------------------------------------
W: AA 3E 02 00
X: 10
W: AA 40 02 26 00 00 32 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
W: AA 60 A5
X: 10
W: AA 3E 02 00
X: 10
C: AA 60 A5
W: AA 3E 24 00
X: 10
W: AA 40 00 19 28 63 5F FF 62 00 32 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
W: AA 60 69
X: 10
W: AA 3E 24 00
X: 10
C: AA 60 69
W: AA 3E 31 00
X: 10
W: AA 40 0A 0F 02 05 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
W: AA 60 DF
X: 10
W: AA 3E 31 00
X: 10
C: AA 60 DF
W: AA 3E 40 00
X: 10
W: AA 40 64 78 0F 82 23 04 00 14 04 00 09 04 26 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
W: AA 60 20
X: 10
W: AA 3E 40 00
X: 10
C: AA 60 20
W: AA 3E 44 00
X: 10
W: AA 40 00 32 01 C2 30 00 03 08 98 01 00 3C 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
W: AA 60 F9
X: 10
W: AA 3E 44 00
X: 10
C: AA 60 F9
W: AA 3E 50 00
X: 10
W: AA 40 01 F4 00 1E C8 14 08 00 3C 0E 10 00 0A 46 05 14 05 0F 03 20 7F FF 00 F0 46 50 18 01 90 00 64 19
W: AA 60 E4
X: 10
W: AA 3E 50 00
X: 10
C: AA 60 E4
W: AA 3E 50 01
X: 10
W: AA 40 DC 5C 60 00 7D 00 04 03 19 25 0F 14 0A 78 60 28 01 F4 00 00 00 00 43 80 04 01 14 00 08 0B B8 01
W: AA 60 DB
X: 10
W: AA 3E 50 01
X: 10
C: AA 60 DB
W: AA 3E 50 02
X: 10
W: AA 40 2C 0A 01 0A 00 00 00 C8 00 64 02 00 00 00 00 07 D0 0A 03 5A 14 00 00 00 00 00 00 00 00 00 00 00
W: AA 60 3E
X: 10
W: AA 3E 50 02
X: 10
C: AA 60 3E
W: AA 3E 51 00
X: 10
W: AA 40 01 F4 00 64 02 BC 00 3C 3C 01 B3 B3 01 90 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
W: AA 60 78
X: 10
W: AA 3E 51 00
X: 10
C: AA 60 78
W: AA 3E 52 00
X: 10
W: AA 40 7F FF 00 00 00 81 17 70 08 AC 0D AC 00 C8 00 32 00 14 03 E8 01 07 D0 00 0A FF E2 FF E3 00 02 00
W: AA 60 6C
X: 10
W: AA 3E 52 00
X: 10
C: AA 60 6C
W: AA 3E 53 00
X: 10
W: AA 40 35 50 10 C2 C0 C9 E7 E2 F2 E6 E9 E3 E3 E5 E5 E7 E5 EC DF E0 DC DC E9 E9 F0 F0 F3 F5 F5 F7 F3 F0
W: AA 60 6D
X: 10
W: AA 3E 53 00
X: 10
C: AA 60 6D
W: AA 3E 53 01
X: 10
W: AA 40 EE E5 E6 D5 E8 EB F0 E4 E9 D6 80 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
W: AA 60 8B
X: 10
W: AA 3E 53 01
X: 10
C: AA 60 8B
W: AA 3E 54 00
X: 10
W: AA 40 F7 50 05 1E 10 08 08 00 02 FB 01 00 00 00 03 02 F5 06 F3 0E 10 00 04 FA FF 02 F4 F8 F5 05 F6 F6
W: AA 60 95
X: 10
W: AA 3E 54 00
X: 10
C: AA 60 95
W: AA 3E 54 01
X: 10
W: AA 40 03 F7 20 01 10 F9 D9 9B DD 81 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
W: AA 60 09
X: 10
W: AA 3E 54 01
X: 10
C: AA 60 09
W: AA 3E 55 00
X: 10
W: AA 40 FF 83 03 06 06 0C 0D 01 01 0D FF FD 02 04 D9 19 43 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
W: AA 60 0F
X: 10
W: AA 3E 55 00
X: 10
C: AA 60 0F
W: AA 3E 6C 00
X: 10
W: AA 40 FE 9B 03 00 05 01 FD 0A FD F5 F9 F6 07 15 1F A0 E5 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
W: AA 60 B5
X: 10
W: AA 3E 6C 00
X: 10
C: AA 60 B5
W: AA 3E 59 00
X: 10
W: AA 40 00 2A 00 23 00 21 00 28 00 1B 00 18 00 1B 00 17 00 14 00 14 00 1F 00 3E 00 AA 00 73 00 78 00 00
W: AA 60 EA
X: 10
W: AA 3E 59 00
X: 10
C: AA 60 EA
W: AA 3E 6D 00
X: 10
W: AA 40 07 70 0E 73 0E 73 10 C2 10 90 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
W: AA 60 14
X: 10
W: AA 3E 6D 00
X: 10
C: AA 60 14
W: AA 3E 70 00
X: 10
W: AA 40 80 00 80 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
W: AA 60 FF
X: 10
W: AA 3E 70 00
X: 10
C: AA 60 FF
;--------------------------------------------------------
;Exit CFGUPDATE
;--------------------------------------------------------
W: AA 00 00 00
W: AA 00 42 00
X: 3000

  • 0 in reply to user5776633
    TI__Guru 52115 points

    Thanks,

    Can you integrate the Qpass through each one of these logs to compare? The first step is to make sure for the same test, your Qpass is the same.

    I would recommend also performing a GPCCHEM test on both batteries to make sure they match to the same chemID.