Which end terminal battery solder is better?

frk1206 · Sep 19, 2022

I’m building my battery using the copper / nickel sandwich method. I did the negative side wire solder like this which is kinda yucky:

Then I had a idea and did the positive side directly on copper. Way neater since I was able to do the solder prior to welding:

should I redo the negative one like this? Or are they both okay? Not going to draw more than 40-50amp continuous from the battery.

liveforphysics · Sep 19, 2022

Whatever thermal damage that may have occurred has already happened. Watch for abnormal self-discharge behavior from that cell group for a few days with no BMS attached.

frk1206 · Sep 19, 2022

liveforphysics said:
Whatever thermal damage that may have occurred has already happened. Watch for abnormal self-discharge behavior from that cell group for a few days with no BMS attached.

Oh no you think it’s that bad? I thought some quick soldering not directly on the top of the battery was okay. I can take these cells out and replace with new ones so all is not lost.

chuyskywalker · Sep 20, 2022

2022-09-20 09_57_55-Which end terminal battery solder is better_ - Endless Sphere.png

Sidenote: In the future, don't do this. You run the risk of missing and welding through the side of the cell creating a weld from negative to positive on that cell.

frk1206 · Sep 20, 2022

chuyskywalker said:
2022-09-20 09_57_55-Which end terminal battery solder is better_ - Endless Sphere.png

Sidenote: In the future, don't do this. You run the risk of missing and welding through the side of the cell creating a weld from negative to positive on that cell.

Yup thanks that was a dumb idea. I was trying to make it look pretty

docw009 · Sep 20, 2022

frk1206 said:
chuyskywalker said:

2022-09-20 09_57_55-Which end terminal battery solder is better_ - Endless Sphere.png

Sidenote: In the future, don't do this. You run the risk of missing and welding through the side of the cell creating a weld from negative to positive on that cell.

Click to expand...

Yup thanks that was a dumb idea. I was trying to make it look pretty

The fishpaper washers on the positive terminal will add a little insurance against an errant weld hitting the edge of the can.

amberwolf · Sep 20, 2022

chuyskywalker said:
Sidenote: In the future, don't do this. You run the risk of missing and welding through the side of the cell creating a weld from negative to positive on that cell.

Would that make a new turn of the old "hits the fan" phrase, as "when welds hit the can"? :flame:

Which end terminal battery solder is better?

frk1206

100 mW

liveforphysics

100 TW

frk1206

100 mW

chuyskywalker

1 kW

frk1206

100 mW

docw009

1 MW

amberwolf

Administrator

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