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

On 3 Jun 2005 23:23:15 -0700, kongchi_du@xxxxxxxx (Qizhang Du) wroth:

>Thank you. But 4 cell pack will give twice the current than using 7 cell pack.

You were going to use 7 cells anyway. Two four-cell packs in parallel
could handle the current.

>Also,the best converter's efficiency is 90%,the other problem is I have to
>handle is the heat if I go in this way.
>
>BTW,my 7 cell pack have to output 6-10A.
>
>Qizhang
>

OK. One other solution is to use MOSFET switches to allow two four-cell
packs to be discharged in series and then putting them in parallel for charging.
MOSFET switches are almost 100% efficient. This solution means that the battery
system cannot be used for running your project while it is charging. That may
or may not be a problem.

Both my suggestions have been used successfully in some robotic
applications where I work.

Jim


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