bq40z60 does not stop discharging at 3000mV

Ivo Van Ursel

Prodigy 155 points

Other Parts Discussed in Thread: EV2400, BQ40Z60, BQSTUDIO

I have the following hard- and software

- EV2400 (EV2400_Updater_v0018.exe)

- bq40z60EVM (BatteryManagementStudio-1.3.45_Build6-windows-installer.exe)

-4 x Honcell HCP487390, 3.7V, 3900mAh, 14.43Wh

I've loaded bq40z60_v0_15_build_21.srec.

And changed the number of cells from 3 to 4.

Charging goes fine and switches off at bout 4223mV.

Discharging should stop at 3000mV, but that it doesn't do and runs even passed 2500mV.

What did I overlook?

I haven't got a Chemistry ID, I did not yet a calibrate nor a learning cycle, as long I cannot trust discharhing to stop at 3000mV I hesitate to runjh those.

Thanks!

Regards,

Ivo

over 9 years ago

0 ThomasCosby over 9 years ago

TI__Guru 73830 points

Ivo,
Which parameter did you set to stop the discharge at 3000mV. The Term Voltage setting will not stop a discharge, but CUV will open the DSG FET.

Tom

0 Ivo Van Ursel over 9 years ago in reply to ThomasCosby

Prodigy 155 points

Tom,
I used bq40z60_v0_15_build_21.srec as a starting point and only changed the number of cells from 3 to 4.
I browsed quite a number of .pdf files and looked around in bqStudio but haven't found how to insert the end value of 3000mV.
CUV - threshold 2500mV, Delay 2s, Recovery 3000mV.

Ivo

0 ThomasCosby over 9 years ago in reply to Ivo Van Ursel

TI__Guru 73830 points

You can change the CUV threshold in the Data Memory section of bqStudio. It is located at the top of the Protections page. Just enter the new value and press the <Enter> key and the update will be transferred to the flash memory.

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bq40z60 does not stop discharging at 3000mV