BQ3060: BQ3060 cycle number abnormal

 value of cycle should not be greater than 10， CC% is 90%， CC threshold is 3200mAh， I think these two parameters（CC and CC%） are normal

The parameter configuration of 50 samples produced in the same batch is the same. This phenomenon occurs in one of them, and the others are normal

Hi Sir，

 Is this a known bug of bq3060 or ? Or how can we avoid this risk? We need to judge the state of the battery according to the value of cycle

Hello Jinxing,

This is not a known bug for the gauge. As I mentioned there are multiple reasons why it could happen, most of the time these issues are related to bad communication, corrupted programming, or external ESD event that damages the data flash.

How many gauges is this occurring on? If you re-program the gauge is the issue resolved?

Sincerely,

Wyatt Keller

There is a 1% probability of abnormal of this register. In normal use, we only read the value of the register (we do not write). If i rewrite the register of cycle, it looks normal (With the charge and discharge of battery, the value of  register increase also normally)

The interface of our battery is SMBus. The static electricity you mentioned may cause this problem. Does static electricity only cause this register （cycle）error or other registers error? Can you help recurrence this phenomenon?

Hi Sir，

     Here's another question about current register of BQ3060, There is a 1% probability of abnormal of this register, when the register is abnormal,it display about -18mA(it should be 0mA),What is the possible reason for this? Is it also related to static electricity？

Hello Jinxing,

It may be possible for the calibration to be damaged as well, leading to incorrect current readings which may increase your cycle count. This would also cause issues with the gauging if the current reported was abnormal.

Can you share a .gg file from the "bad" pack and a "good" pack?

Sincerely,

Wyatt Keller

f.rar                                                                                                                                          Hi sir, please check the file, the battery of Current abnormal （cycle register ok）and  the battery of cycle abnormal（current register ok） , they are not the same batteries

Hello Jinxing,

The files shared are exactly the same. Can you share a bad pack's .gg file? It seems that the bad gauge may have been reprogrammed.

Sincerely,

Wyatt Keller

Hi Sir，Sorry for the previous wrong information，Please check the attached file this time，Thank you!7167.gg.zip

Hello Jinxing,

I don't see any abnormal values between the two, does the cycle count always jump to near the same value? I see the CC gain CC delta and CC offset are all different, was it calibrated differently?

Sincerely,

Wyatt Keller

Hi Sir， it calibrated differently， I am not sure if the wong number of cycles are same, so can you find out something lead to wrong cycle number from the gg.file ?

Hello Jinxing,

I'm curious if the bit or bits that get flipped to report the value over 50000 are the same for each gauge. It's strange to me for the error to occur and all the cycle count values go to the same value over 50000. You mentioned this is occurring in only 1% of the gauges, how many gauges does this equate to for your production?

Sincerely,

Wyatt Keller

We produced 500 pieces 3cell battery and found 3 pieces with wrong cycle number. I'm not sure whether the wrong cycle value are the same, but it's certain that the wrong cycle value are very large