This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ34Z100-G1: not able to do learning cycle with bq34z100g1 evm board

Part Number: BQ34Z100-G1
Other Parts Discussed in Thread: BQ25713, GPCCHEM, BQSTUDIO

hi,

i was trying design procedure for 1 cell configuration with bq34z100g1 evm kit. when i started the learning cycles, the flags are changing according to the instruction documents on each steps but the update status and max error did not change. so i assumes that my learning cycle is failed.

what i have done:

used components: bq34z100g1 evm - gauge [kept in single cell config]

                              bq25713 evm as charger [kept in single cell config]

                              18650 li-ion battery * 1

used bq studio application to updated : design capacity = 3000

                                                               design energy = 11100

                                                                qmax cell 0 = 3000

                                                                term voltage = 3000

and kept all other values to default and started the design procedure. once i started the learning cycle, 

step 1. -> Discharge Battery to Empty - started discharging the battery stoped it when across the battery = 3V.

step 2 -> Relax for at least 5 Hours - OCVTAKEN was set.

step 3 -> Charge Battery to Full - charged using charger ic and the charging current was 511mA. stopped the charging once FC bit is set and seen SoC = 100 %

step 4 -> Relax for at least 2 Hours -> here [VOK] bit is cleared and Flags[OCVTAKEN] was set. but Update Status() is not updated to 0x05

step 5 -> Discharge Battery to empty -> discharged the battery at 600mA rate. stopped once the SoC = 0%, and SOCF bit was set

step 6 -> Relax for at least 5 Hours -> [VOK] bit was cleared and Flags[OCVTAKEN] was set. but again the update status() is not set to 0x06 and max error is still 100%.

why is this happening. is there any other thing i need to do extra.

  • Hello,

    The most common issue is selecting the correct chemID for the battery cell you are using, you can find the correct cell either by finding the exact model in bqStudio or by using the GPCCHEM tool. You can follow appendix D in the TRM for a guide on how to complete the learning cycle: www.ti.com/.../sluubw5.pdf

    If you selected a chem ID, can you provide the report or the model battery you are using? If you selected the correct chem ID and there is still this issue can you provide log file of the cycle and .gg file you used for the test? It will be easier for us to look through the log data.

    Sincerely,

    Wyatt Keller

  • hi,

    thanks, seems the issue is due to usage of default chemid of li-ion battery. i have updated the chemical id corresponds to new battery pack and the learning cycle was successful.