BQ40Z80EVM-020: BQ40Z80EVM-020: Trouble with finish learning cycle, 'Update Status" field doesn`t change. QEN/VOR/RDIS registers don`t set at same time.

Artem Muzykin

Prodigy 20 points

Part Number: BQ40Z80EVM-020
Other Parts Discussed in Thread: EV2400, GPCCHEM

Equipment:

BQ40Z80EVM-020
Rechargeable Lithium Ion Battery Model : INR18650HJ2 (4 units)
laboratory power supply

Jumpers position:

J10

J13

J14

J15

J16

J17

J18

J20

J21

J22

None

PIN12_PRES

PIN15_VC7EN

PIN12_VC7SNS

None

PIN16_CB7EN

None

PIN13_LED

PIN20_LED

PIN22_LED

PIN21_LED

EV2400_SMBD1

PIN12_onward

PIN13_onward

EV2400_SMBC1

Tried to achieve a successful learning cycle using the following official guide: https://www.tij.co.jp/jp/lit/an/slua903/slua903.pdf?ts=1705308902556&ref_url=https%253A%252F%252Fwww.google.com%252F

After completing the guide re-action and even additional cycles, the "Update Status" field in memory is still 0x04, but the guide should be 0x05 and then 0x06.

List of parameters changed before the start of the learning cycle:

Parameter name	Value
Enabled Protections D	0x0F
DA Configuration	0x10
Cell Configuration	0x04
Protections/COV	3900
Charge Term Taper Current	50
Design Capacity (mAh)	3000
Design Capacity (cWh)	4320
Voltage Threshold	2500-2600
Qmax	3000
Term Voltage	10000

Learning full cycle log

Chemical id was taken from GPCCHEM

Last thread

Why doesn't "Update Status" change its value? How to fix it? Are there any other ways to ensure a successful learning cycle?

8 months ago

0 Adrian 8 months ago

TI__Mastermind 29251 points

Hey Artem,

Unfortunately, because of company restrictions on access permissions, I am not able to view files uploaded into Google Drive. Can you please upload the log file as an excel file in this thread. Can you also share the gg file from the gauge?

Regards,

Nick Richards

0 Artem Muzykin 8 months ago in reply to Adrian

Prodigy 20 points

Hi, Nick,

I uploaded the files from Google Drive to Dropbox, since there is no way to attach a file to a thread, I checked that the links worked.

Learning cycle log

Flash data .gg

0 Adrian 8 months ago in reply to Artem Muzykin

TI__Mastermind 29251 points

Hey Artem,

Did you send the "RESET" command before starting the learning cycle? The main problem I see is that the terminate voltage set in the gg file is 10000 mV, yet during the test you only discharge down to 12000 mV. You have to discharge down to the stated terminate voltage to complete the learning cycle.

Regards,

Nick Richards

0 Artem Muzykin 8 months ago in reply to Adrian

Prodigy 20 points

The board was reset, perhaps it should be done immediately before the start of the discharge? The termination voltage is set to 10,000 mV for all batteries or 2,500 mV for one, so discharging stops when one of the batteries reaches 2,500 mV (the rest have more, hence 12,000 mV) and there is no possibility of discharging any more.

0 Adrian 8 months ago in reply to Artem Muzykin

TI__Mastermind 29251 points

Hey Artem,

Yes, so I believe the root cause of your problem is because of this imbalance of cell 2 compared to the other cell voltages. I would recommend enabling cell balancing on the gauge to hopefully balance the voltages of the cells.

Regards,

Nick Richards

0 Artem Muzykin 8 months ago in reply to Adrian

Prodigy 20 points

How to properly enable battery balancing? СB bit in Balancing Configuration was already set. Should I set something extra and charge?

0 Adrian 8 months ago in reply to Artem Muzykin

TI__Mastermind 29251 points

Hey Artem,

Go into Data Memory, Gas Gauging, then Update Status, and make sure bit 3 is high. This should hopefully enable cell balancing.

Regards,

Nick Richards

0 Artem Muzykin 8 months ago in reply to Adrian

Prodigy 20 points

Thank you, I set the required bit. How many charging cycles are needed for the batteries to be balanced?

0 Adrian 8 months ago in reply to Artem Muzykin

TI__Mastermind 29251 points

Hey Artem,

That really depends on many different factors. I can not give you a definitive answer on that question. Hopefully, it should balance in a few charging cycles.

Regards,

Nick Richards

Power management

Power management forum

BQ40Z80EVM-020: BQ40Z80EVM-020: Trouble with finish learning cycle, 'Update Status" field doesn`t change. QEN/VOR/RDIS registers don`t set at same time.