Electronics > Beginners
The positioning and size of Vias
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Blix:
Hi, I am going to create a PCB to connect lithium-ion batteries and the parallel groups can reach current spikes up to 60 Amps, now I am wondering how I should place the vias the best way possible (2oz PCB and 18um Via plating)? As even as possible or right behind the connection point with the battery, or where the batteries are connected in series... I really don`t know and would appreciate the help a lot.
Thank you in advance, Jonas :)


Edit: I have used Saturn PCB, still don't know which diameter is the best and where to place the vias (small 0,3mm vias seem the best but if I want, could I fill them with solder or are they too small?)... I have an area of 30mm width x 70mm length and 30mm width x 140mm length.
I can post pictures if required.
schratterulrich:
Hi,
you could make some crude simulations with this tool:
https://leiterplatte.jimdo.com/thermal-pcb-sim/

nigelwright7557:
With 60 amps 0.3mm via's will be just blown off the pcb.
For power pcb's I tend to use much bigger via's.
But the main trick is to avoid them if at all possible.
I designed a power supply pcb and managed to get rid of most of the via's and used components to pass from layer to another.
If you use component holes they are filled with a component leg and solder and this increases current capability massively.



Blix:
Sadly this program was kind of weird, stacking Vias on top of each other(without noticing(this changed the results somehow)) and placing them all 1 by 1 is very exhausting, also I got different results for the same setup... because it crashed and I forgot to save.

Which diameter do I need? I thought it depends more on the plating thickness and with enough amount you can compensate it?!

It should end up like this 2oz and 2 layers like I already said: http://prntscr.com/os76s4

schratterulrich:
I am right in assuming that you only change the layer so that you can use the bottom copper side in parallel with the top side to get a greater current carrying capacity?
If you don't need to change the layer you could use pressfit connectors on which you can screw a copper busbar to bypass the pcb.

We have used this method for a 300 A step down converter.

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