Isn't 60c or 100C common in Radio Control stuff now? Lots of solutions
there.
On Monday, April 13, 2020, 9:51:43 PM PDT, Peri Hartman via EV
<ev@lists.evdl.org> wrote:
Nominally 240. But it really can be anything and I can convert it to
what I need.
Peri
------ Original Message ------
From: "Alan Arrison via EV" <ev@lists.evdl.org>
To: ev@lists.evdl.org
Cc: "Alan Arrison" <bigg...@comcast.net>
Sent: 13-Apr-20 9:48:53 PM
Subject: Re: [EVDL] custom battery
>That sounds like almost super-capacitor territory. What voltage is needed?
>
>Designing and implementing a BMS is something even EE's have trouble with.
>
>However, if the voltage is low enough, it makes it much easier.
>
>Al
>
>On 4/14/2020 12:33 AM, Peri Hartman via EV 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
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