BQ27621-G1: Battery replacement with a system-side gauge

Hitoshi Okuma

Intellectual 260 points

Part Number: BQ27621-G1
Other Parts Discussed in Thread: BQ27441-G1

Tool/software:

Hi TI Team,

There are many system-side gauges for single cells, such as BQ27621-G1, BQ27441-G1 or etc.

Please provide information on the general functions and algorithms.

Suppose you have a board with one of the system-side gauges and a battery that goes with it.
If the battery you replace is not new and has some deterioration (e.g. SoH 85%), will the remaining battery information be correct for the connected battery after just a few charge/discharges and automatic ImpedanceTrack operations without manual settings?

Or is there no such shortcut and you have to understand and operate each gauge's unique procedures and modes of operation?

Regards,
Hitoshi

over 1 year ago

0 Jonny over 1 year ago

TI__Mastermind 24741 points

Hello Hitoshi,

Assuming that you are using the same type of cells that you have the gauge configured for (the same chemistry) then the gauge should learn the new FCC after a couple of cycles. Note that when you insert this aged cell into the gauge, the gauge will not initially be accurate and will take a couple of cycles to learn some of the key parameters of the battery.

Regards,

Jonny.

0 Hitoshi Okuma over 1 year ago in reply to Jonny

Intellectual 260 points

Hello Jonny,

Of course, this assumes that the battery cells are exactly the same type.

I understand that it is necessary to learn a few cycles. Thank you.

Anyway, is it correct to assume that there is no need to manually edit the DF? (Although there may be some tricky issues, such as how to set the CycleCount for a newly connected used battery.)

Regards,
Hitoshi

+1 Jonny over 1 year ago in reply to Hitoshi Okuma

TI__Mastermind 24741 points

Hello,

Yes there should not be any need to manually edit the DF.

Regards,

Jonny.

+1 Hitoshi Okuma over 1 year ago in reply to Jonny

Intellectual 260 points

Hello Jonny.

Okay. Thank you.

Regards,
Hitoshi

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BQ27621-G1: Battery replacement with a system-side gauge