Re: How to design a circuit that protect 7 lithium-ions in series

Qizhang Du wrote:
> There are many ICs that protect Li+ battery string(<=4 cells in
> series).
>
> Now I have a project that I have to design a circuit that protect 7
> Li+
> in series. There is no IC which is designed for string larger than 4
> cells.
>
> The way I choose to design the circuit is to use 7 single cell
> protection ICs in series, one chip protecting one chip. But the
> problem I met is the circuit can not provide overcharge protection
> when the battery voltage go up very fast.
>
> Is the way I choose wrong? Anyone could give me some advice?
>
> Thanks in advance.

I think your approach with single controllers sounds good. I am also sure it
will be possible to incorporate an overvoltage protection, maybe with some
additional parts or with different charge controllers. Did you ask the
application engineer of the controller manufacturer to assist you?
--
ciao Ban
Bordighera, Italy


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