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The Jehu PCB v1.1 Testing and Review thread
#11
Nice work. By the way, are you in the US? I'd be interested in buying a few boards to do some testing also if you are. Had an offer from someone in the UK to ship some over but that seemed a bit ridiculous compared to just buying new ones from China.

At least for DC/AC resistance measurement, the SMD holders seem much more consistent, and have about half the resistance. Though the resistance I measured on either was still pretty small, around 30 mOhms I believe. I will be interested to see how the SMD ones fare under the same loading, seems most people aren't interested in using them for some reason, I thought they would be more popular since it supports 2-sided loading and (presumably) higher power.
#12
Thanks, I am in the US, send me a PM and we can talk about getting you some boards.

Which SMD holders were intended for this PCB?  

These are the ones I am using in the photos below... they are pretty nice, but they do cost a fair bit more than the other, which is probably why people are showing less interest.

Personally I think they are great, and I do throw some decent amperage though them without any real issues.  I use them for my internal resistance testing and for charge/discharge of high drain cells.  

hbpowerwall likes this post
#13
(08-31-2018, 05:29 PM)ecam315 Wrote: Any thoughts on somehow modding the boards so they could plug into a backplane like someone is designed in another thread? Or at least just the BMS pins?


Thread : The finish-ish of a pcb based 14S 80P powerwall

Yeah, redesign the PCB layout to incorporate that particular design. Not that difficult if Justin/rev0 is willing to give the data files (not sure if you can edit gerbers or not; haven't tried yet)
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#14
I haven't worked with backplanes before, would that just be changing holes to SMD pads which would slide into a holder like a PCI slot? Should be easy enough to do if I get the datasheet/dimensions of the desired holders.
#15
(08-31-2018, 09:09 PM)rev0 Wrote: I haven't worked with backplanes before, would that just be changing holes to SMD pads which would slide into a holder like a PCI slot? Should be easy enough to do if I get the datasheet/dimensions of the desired holders.

Precisely like that... 

Backplanes are very common place in PC server applications, many examples can be taken from that.  Hard drives, power supplies, and other various items can be observed as good examples.

Here is a power supply from an HP Proliant server which had dual hot swap power supply units.  The + / - and other control circuits are all made in one simple insertion of the PCB.  In our case, we can have power and balance leads all available to the backplane which makes it easier to scale.



Lots of cool things can be done at the backplane level...  for example if all the battery boards were just parallel holders, the backplane could be designed to either be a 1s parallel module or a series module at pack voltage.  Changing only the backplane could suite two very different designs and applications making it even more versatile.
voxelman likes this post
#16
(09-01-2018, 01:28 AM)Crimp Daddy Wrote:
(08-31-2018, 09:09 PM)rev0 Wrote: I haven't worked with backplanes before, would that just be changing holes to SMD pads which would slide into a holder like a PCI slot? Should be easy enough to do if I get the datasheet/dimensions of the desired holders.

Precisely like that... 

Backplanes are very common place in PC server applications, many examples can be taken from that.  Hard drives, power supplies, and other various items can be observed as good examples.

Here is a power supply from an HP Proliant server which had dual hot swap power supply units.  The + / - and other control circuits are all made in one simple insertion of the PCB.  In our case, we can have power and balance leads all available to the backplane which makes it easier to scale.


Lots of cool things can be done at the backplane level...  for example if all the battery boards were just parallel holders, the backplane could be designed to either be a 1s parallel module or a series module at pack voltage.  Changing only the backplane could suite two very different designs and applications making it even more versatile.

Cool, yeah as I said, finding the mating connector for a 1.6mm thick (or 1.2mm I think is another standard thickness from JLCPCB) would be the deciding factor on how to proceed laying it out. Any idea on cost also?

There is another user that already did a 1sXp backplane.
#17
Sooo… I’ve had a busy night.  Pretty much missed the Jehu live stream playing with batteries… ironic
 
Update / Progress Post #2
  • Will use this PCB as-is to test various 7s BMS options including the Chagery BMS8 and the Bluetooth BMS
  • Going to experiment with a non-stacked design to utilize horizontal space instead
  • Resettable Fuses instead of one time use for “field durability”.  No need to disassemble and re-solder in the event of an over current condition.
  • Load test using an efficient DC off-road grade fridge/freezer.
 
Instead of stress testing these things to the point of failure I decided to just try to make something decent instead.  It’s pretty obvious these are best suited for low current applications, but with a good wiring setup, it could easily scale.  I have some ideas I will share in another post.

I don't do a lot of video, and I am not that active on YouTube but here is one of the load test using a single board and a real world load... my truck fridge.



Here are some photos from my other talking points above.

The BMS that I am FINALLY getting around to testing.  My main focus has been my 15s system so I haven't picked this up in a while.  I will be getting one of those Bluetooth BMS balance boards to test as well.



Thinking about how I might want to build the battery base for the fridge... Lay flat with a fuse block to put everything in parallel.  Each branch is individually fused at a service point with resettable fuse on the PCB.



In the spirit of talking about backplanes… Maybe a DIY cabled “backplane” for balance leads.  Still brainstorming but I already had these parts in the bin.  Thinking about something like this.



That's it for now... ill keep it going as I make progress.  I'm actually less worried about the electronics than I am about the base.  Not sure what to use, but ill most likely explore using wood.  Anyone have any ideas?
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#18
Whoops... the video link broke.

Here it is.

voxelman likes this post
#19
Youtube-Links-Video-and-URL Wink

Nice work. I'll have to watch the video when I get back home
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#20
Nice work crimp daddy. Does your bms get hot. Mine gets do hot the screen goes black. And the 8 wires also get warm.


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