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First Spot Welding test

A project log for A 110 kWh Powerbucket

The lead-acid batteries of my off-grid solar system are dead. I will replace them by a 18650 batteries stack housed in a big wooden box.

michel-kuenemannMichel Kuenemann 07/02/2016 at 21:270 Comments

My Spot Welder is finished and I made the first tests on a module assembly populated with 3 cells :

It works fine but the welding time must not be too long, otherwise the can of the battery may get punctured, with the electrolyte leaking out. This means the death of the cell.

A close up of the copper welding electrodes:

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