So this is my first build. Before Im going to assemble the battery using Vruzend 2.0 kit and 18650 samsung 30Q 3Ah cells I visuealized the connections in a powerpoint (and the subsequent image below). I have a few questions regarding the diagram / connections.
So the 18650 cells are placed in the Vruzend Kit 2.0. These are connected with busbars. The advise on the website is to use an extra busbar for the series connection for the amount of parallel cells. So a 3p connection to a 3p should have 3 busbars. My question is: do the parallel connections also need 3 busbars. I can’t seem to understand how this theoretically works
Is this the best layout for the cells? It fits exactly in an Ikea Stodja in this configuration and to me it seems the best layout. I’m wondering if there are any other suggestions.
I thought I read something here that this vruzend holders not a good solution for our purposes of esk8ing… it was because they can’t handle the current or because they became lose from vibration
If you do a search query on this battery pack build, you will find useful information on the pros/cons. One of the issues is how do these packs hold up on vibration from the esk8.
I don’t see balance wires from pack to BMS in your drawing.
This video helped me learn more about this process:
And what with the serial connections?
For them you use bigger copper or wires?
I didn’t read in deep in this topic so i‘m just interested.
I mean it can’t add up 24a with every cell you add in your pack.
If you have a 3p pack the max current you can get out of your pack it’s 60a or 20a per cell in every serial pack but through every serial connection it will flow 60a…
I thought the taps out of copper can handle 24a.
Than there is still the question how the serial packs connected? Can you add for them extra layers of copper?
the busbars are made out of copper and sure you can stack them.
@ethel no i went with NESE since i wanted to build a 10s4p pack. It was a better choice and i am very happy with it.
@ethel thx, I put numbers on where the balance leads go, as it was otherwise to messy a diagram
@Andy87 On the concern of the vibrations: I’m aware. This might be a problem. I’m just going to use a lot of tie wraps, hot glue and heat shrink to keep the pack together. Also if there is room I’m covering them with something extra to hold it together. Then see if it works
So if i understand correctly I also need to beef up the parallel connetions.
the serial connectiones.
in parallel the current will divided through your cell count so the 24a copper strip should be enough.
but in serial all current flows through that one connection from your parallel pack1 to parallel pack2, so in this point i would say it´s recommended to add up the copper strips.
Ah yes, I completely forgot to post anything on this forum about this as building te eboard took quite some time longer then expected haha. But it is finished with the vruzend 2.0 kit.
Put some extra foam around it as shock-absorbers, hot-glued all the parts & tie-wraps.
Only thing I did not think of before and really annoyed me was the size the battery pack gets when using this kit.
I’ve used the board for about 20km now (only riding in good, dry weather and the board is finished a couple of weeks ago) without any problems. Will do an update in a couple of months if the thing is still working.I’ll also post a small piece about my build and the problems with it.
