Wow, that is a very impressive open-source project!
Only complaint I would make is that it uses wireless communication -
using CAN BUS or 100BaseT1 would be better - especially when you are
putting blocks into different parts of the EV. For example, in my 914,
I had 3 separate compartments for my batteries.
Is there interest in taking this design and porting it to large format
batteries? That's what I was getting from the discussion of the
miniBMS, in any case.
I'm definitely interested in helping with this project - I'm really good
at programming, not so good at electronics. :)
Cheers, Peter
On 4/28/20 9:28 AM, Peri Hartman via EV wrote:
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" <ev@lists.evdl.org>
To: ev@lists.evdl.org
Cc: "Mr. Sharkey" <mrshar...@juno.com>
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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