There are folks out there who are attempting to rebuild battery packs with cheap, imported spot welders. We have done extensive testing with the strength and reliability of spot welds and we can say with confidence that all spot welds are not equal. To spot weld a .15mm thick nickel strip to a lithium cell, you need a lot of energy in a very short pulse. All of our spot welders are dual pulse, meaning that they deliver a smaller, initial pulse of energy to clean the weld area and prepare for the massive current dump. Inside a modern CD (Capacitive Discharge) spot welder is a bank of capacitors that contain 300 joules of energy. For context, a bolt of lightning is roughly 5 gigajoules, so we're nowhere near that, but we still need a lot of current going into the weld to correctly join the two surfaces. This capacitor bank can deliver over 1500a of current in less than 500ms! Now that is enough energy to kill you instantly, but when it's directed through the tabs of a nickel strip, it makes a perfect, solid joint.
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