To follow up a bit, I have had several email exchanges with Tim. He has
an amazing product which is open source and also available on ebay. I'm
still working out my requirements. It seems every time I'm "done" the
next time I look at my calcs I find a problem :) Plus, there are many
options on what voltage or current to pick, in order to keep the price
down for various components.
Anyway, I think I'm likely to buy a few of his blocks and BMS boards.
Not sure about the central board yet, might integrate that with
software.
His blocks are configurable so that you can have groups of parallel
cells within each block (I think this is true) rather than the whole
block as a series of individual cells.
Peri
------ Original Message ------
From: "Mr. Sharkey via EV" <[email protected]>
To: [email protected]
Cc: "Mr. Sharkey" <[email protected]>
Sent: 28-Apr-20 8:21:35 AM
Subject: Re: [EVDL] Minibms?
A couple of weeks back, there was an ongoing discussion about building a custom
battery that Peri was designing. An offshoot post from that by Tim Economu
offered an open source BMS/cell module assembly project that he had worked up:
http://electric-vehicle-discussion-list.413529.n4.nabble.com/custom-battery-DKblock-td4696973.html
(pointing to the Nabble archive)
https://github.com/offgridsystems (github resource repository)
I was surprised that this received no replies, as it looked like an interesting project.
I had a look at the source code for the "Block Manager" (cell level monitor),
and although it had features that wouldn't necessarily apply to a simple management
system, all of the programming that would be needed was there and well written. It would
likely be a matter of removing unneeded code for features that weren't going to be
employed (thermal management for example), as well as adjusting voltage setpoints for
your particular cell chemistry.
Tim Economu's qualifications and background are impeccable, you couldn't ask
for a better collaborator on a project like this.
All of the components to replicate a v.2 or v.3 MiniBMS knock-off are available
in through-the-hole packages. The parts count is low enough that they would
still be fairly compact when completed.
> Even the v3 boards are not terribly complicated from a circuit
> standpoint. And I feel confident that the firmware they run could be
> replicated. I could easily see creating an open source PCB and firmware
> again.
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