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Noob help - high current PCB for lithium cell bridging.

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  • Daren Schneider

    I think I figured it out. I ignored the warning about errors when attempting to create manual holes within SMB pads.

    This should work assuming the SMB pads have the same dimensions of copper on the top and bottom as the solder mask. Based off the layer view, they should (new to this, so this might be obvious to others).

    I am going to wire 12awg wire between the top and bottom layers and start with 2oz copper and test before trying to build a battery with it. Crossing fingers.



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  • Boss .

    Well the message "A connection between these two items already exists" is a protection in case you have made an error in your routing, but it can be disabled in Settings preferences.

     

    You mention the "solder mask" and connecting layers. Solder mask is an insulating resist placed over the copper tracks. The tracks connect between layers using via and pads. If a pad has a wire soldered to the copper on both sides then that will conduct the current, otherwise, it is just the through hole plating which has its own current limitations.

    For the copper you can get an idea of the current rating and temperature rise using the calculators.

    Enter your required data and it will give the results in the lower section.

    There is a vai calculator as well, but if you are inserting and soldering wire this will be the dominant effect.

    Hope this helps in deciding if your design is correct.

    You can view your layout for each layer in a Gerber viewer so can see what you have actually designed. Pads and tracks are defined by their copper size as will be confirmed by the viewer.

    Take care with your project as it involves high current and lithium batteries! Double or triple check to be sure of current ratings, temperature rise and general safety.

    I would be interested to see your final design and results.

     

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  • Daren Schneider

    Thank you! 

    I'm not sure when I am going to get the fuses in, but I guess I really don't need those to test the PCB. I'll let you know as soon as I am done. I am gonna probably wire an LED strip to a single 18650 with a heavy duty DC-DC boost to pump the amps up and see how things go...

    Outside. I'm doing this outside, hehe.

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