BQ24192: Maximum number of Parallel Lithium Ion cells

Jeffrey Dowell

Part Number: BQ24192

Hello TI power management forum,

I have a question about using the BQ24192 single-cell battery charger with multiple Li-Ion batteries in parallel. Our product will use 18650 Li-Ion cells in a 1s5p configuration. The total capacity would be about 5x 3000mAh = 15Ah.

Have other customers had success using this charger in a similar configuration? What is the upper limit to either the number of parallel cells or battery capacity?

Thanks for your help.

Jeffrey Dowell

over 5 years ago

0 Paul Yeh over 5 years ago

TI__Genius 14715 points

Jeffrey,

Based on experience, I didn't have customers to design battery with high parallel cell number.

But I think it is no problem for charger, the only one concern is charging current capability.

For BQ24192, the recommend max charging and discharging current specification. see below table.

0 Jeffrey Dowell over 5 years ago in reply to Paul Yeh

Prodigy 70 points

Paul,

Thanks for your help.

Yes - we understand that the charger's I_BAT rating would limit our max battery charging rate for a 1s5p configuration. That's okay for our application.

Our concern was that the impedance tracking algorithm might not be able to support so many parallel cells, since the batteries' internal resistances would be 1/5th of that for a single 18650 cell. We were wondering what the greatest number of cells the charger was designed to support or if other customers have had success with as many as five.

0 Ning T over 5 years ago in reply to Jeffrey Dowell

TI__Guru 51981 points

Hi,

This is charger support. Please submit a separate thread for impedance tracking questions so that Fuel Gauging experts may help you.

Thanks,

Ning.

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BQ24192: Maximum number of Parallel Lithium Ion cells