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Advice on circuit for 4 li-ion cells mounted in series without charging function

nicolas regimbal
Prodigy 20 points

Hello everyone,

I'm designing a system which shall be powered with batteries.

I intended to use 4 individual li-ion cells (18650) placed in a holder. There is no charging function as the user will use an external battery charger (like the good old ones dedicated to AA cells but for these batteries). Each 18650 cell can be delivered with built-in PCB.

I've been studied TI documentations and yet, every topologies I can find are for battery charging.

So here are my questions:

- Could anyone can please advise me on a correct topology and TI references? (shall I use battery gauge with cell balancing function, secondary protection for the whole pack etc...). By the way, I don't care about having indicator of the battery state during use.

- Depending on the recommended topology, is it worth taking cells with individual built-in PCB?

Thanks in advance for your answers,

Nicolas

  • 0
    Guru 22270 points

    Hello Nicolas,

    If you are designing a 4 cell battery pack then you would not need individual PCBs unless you have very specific (safety) requirements. You will need a Pack-Side Gauge or monitoring chip.  You can refer to the Fuel Gauge is the Battery Management Guide http://www.ti.com/lit/slyt420 and choose a gauge or monitor based on your requirements.

    After that, you can search for an EVM with the device of your choice and look at schematics for it.  This would be provide you with a complete reference design.

    Thanks,