BQ27741-G1: chem id varification

Reena Patel

Part Number: BQ27741-G1
Other Parts Discussed in Thread: BQ27426, BQSTUDIO

Hello all,

i have completed chem id cycle and got a report. any one can please double check that the chem id which i get is good for my battery or not.

Battery specification : Tenergy 3.7v 4600mAh Li-ion polymer battery

che id report :

Chemistry ID selection tool, rev=2.47

Configuration used in present fit:
ProcessingType=2
NumCellSeries=1
ElapsedTimeColumn=0
VoltageColumn=1
CurrentColumn=2
TemperatureColumn=3

Best chemical ID : 369 Best chemical ID max. deviation, % : 7.52

Summary of all IDs with max. DOD deviation below 3%

Chem ID max DOD error, % Max R deviation, ratio
0 0 0

Warning: Deviation is above recommended level. New chem ID needs to be released for this cell. Please contact your TI representative to send the cell to Dallas for characterization

Selection of best generic ID for ROM based devices like bq274xx

Device / Family #1
Generic Chem ID Device/ Voltage/ Chemistry max DOD error, %
312 bq27421-G1B: 4.3V LiCoO2 9.48
3142 bq27421-G1D: 4.4V LiCoO2 10.1
354 bq27411-G1C: 4.35V LiCoO2 12.18
128 bq27421-G1A: 4.2V LiCoO2 100
Best generic ID 312
Warning: Deviation for best generic ID is above recommended level for this device / family. Consider using another device, flash based gauge or RAM programming of custom ID.

Device / Family #2
Generic Chem ID Device/ Voltage/ Chemistry max DOD error, %
1210 bq27621: (ALT_CHEM1) 4.3V LiCoO2 9.51
354 bq27621: (ALT_CHEM2) 4.35V LiCoO2 12.18
1202 bq27621: (default) 4.2V LiCoO2 71.1
Best generic ID 1210
Warning: Deviation for best generic ID is above recommended level for this device / family. Consider using another device, flash based gauge or RAM programming of custom ID.

Device / Family #3
Generic Chem ID Device/ Voltage/ Chemistry max DOD error, %
3142 bq27426: (ALT-CHEM2) 4.4V LiCoO2 10.1
3230 bq27426: (default) 4.35V LiCoO2 10.32
1202 bq27426: (ALT_CHEM1) 4.2V LiCoO2 71.1
Best generic ID 3142
Warning: Deviation for best generic ID is above recommended level for this device / family. Consider using another device, flash based gauge or RAM programming of custom ID.

Warning: Discharge rate is too high. High rate reduces ID detection accuracy 10 hr rate is recomeended. Total discharge time is less than 5 hrs t_hrs= 1.209045

over 6 years ago

0 Batt over 6 years ago

TI__Mastermind 42535 points

your question will be answered during a weekday.

0 Reena Patel over 6 years ago in reply to Batt

Intellectual 375 points

yes sir, but give me reply when possible..

0 Onyx Ahiakwo over 6 years ago in reply to Reena Patel

TI__Guru* 76230 points

HI Reena

The report shows that you do not have a close match. Can you tell me if you ran the test with the secondary level protector of the battery attached. if so, then you need to take that out and rerun your test. if there was no protector attached let us know.

thanks

Onyx

0 Reena Patel over 6 years ago in reply to Onyx Ahiakwo

Intellectual 375 points

1033.gpc_chemid_data.zipHello sir,

No we don't have secondary level protector. please suggest me what should i do now ?

here is the attachment of my zip file..

0 Onyx Ahiakwo over 6 years ago in reply to Reena Patel

TI__Guru* 76230 points

Hi Reena

If you are absolutely certain there was no protector internal to your battery and that the test was run on the bare terminals of cells, then you need to send your cells to TI for a new chem id to be generated. The process takes about 4 weeks from the date of receipt. I will contact you offline to provide details on where to ship the cells to. Alternatively, you can change your cells to one that has a chem id already generated. The list of cells are in our bqstudio data base. Let me know how you want to proceed

thanks

Onyx

0 Reena Patel over 6 years ago in reply to Onyx Ahiakwo

Intellectual 375 points

Hello sir,
Same thing happened with me when i was doing chem id for Tenergy 3.7v 1400mah 18500 , by mistakly i forget to put pc on ,while log in discharge and i got thr half log for discharge, and i generate report ...which gives me 353 id . Which i also verify by you also .
And because i was in doubt i did whole chem id process again, but got the error report same as now .. so why its happen ?

0 Onyx Ahiakwo over 6 years ago in reply to Reena Patel

TI__Guru* 76230 points

Reena
I do not understand what you are asking for. Did you say when you redid the chem id process you are still unable to get a good match?

thanks
Onyx