Peri, That is 50C discharge, not impossible but also not trivial. The good old A123 cells could do this. The cylindrical cells are almost 10Wh and can discharge at metal melting speeds. I have a bunch of them here, in case you are interested. Cor.
On Mon, Apr 13, 2020, 9:33 PM Peri Hartman via EV <[email protected]> wrote: > Hi, > > I need a battery with about 150Wh and a discharge rate of 8kW for up to > a minute or so. I've spent a few hours searching and there doesn't seem > to be anything on the market that fits this. There are, of course, > higher capacity batteries that can deliver 8kW, but that's not what I'm > after. > > This isn't for an EV, so I suppose this is somewhat off topic, although > BMSs are a relevant topic to EVs. It's for a home appliance that I'm > prototyping. > > I'm pretty sure I can find affordable cells that I can put together to > do this, but then I'm stuck with a custom BMS. I suspect that's the > route I'm going to have to take. So, let's talk about that. > > Each cell (or group of parallel cells) needs a monitoring circuit (is > there a name for this?). And theses monitors need to communicate with a > BMS. I'm less concerned about designing the BMS as I think I can use an > arduino and do it in software. The arduino can control the charger, too. > I can revisit this later. But for the monitors, I need to get it right. > Since the battery will be in the house, it cannot cause a fire. Ever. Of > course, I will have over temperature sensors which shut off the charger > and shut off the load. > > Here's what I think each monitor's role is, based on what I've read on > EVDL over the years and some common sense :) > - cell over voltage > - cell under voltage > - cell over current > - cell temperature > In all of the above the circuit should shunt the cell. > In addition, the monitor should constantly report the cell voltage, > current, and temp to the BMS. > > If there's something reliable I can buy, at a reasonable price, that's > my first choice. Otherwise, I guess it's getting someone to help design > and fabricate these. > > I would be grateful for your suggestions. > > Peri > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20200414/ccfe4eb7/attachment.html > > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > ARCHIVE: http://www.evdl.org/archive/index.html > INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Please discuss EV drag racing at NEDRA ( > http://groups.yahoo.com/group/NEDRA) > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20200413/2e21c9a4/attachment.html> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/index.html INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
