How to remove the battery pack welding points

Can a 10 mm nickel be welded to a spot welded battery?

The ,10mm nickel easily conforms around raised edges when spot welded. A second layer seems to attach OK. Yeah, when you grind the top, you're grinding off the surface nickel on the batteries that's supposed to protect the casing from rust and corrosion.

How do you remove nickel from a weld?

It's not really easy to remove the nickel depending on how good the welds are. I uses a needlenose pliers to peel up the strips in sort of a rolling action. It's easy to short the pack doing this kind of work, so use tape or cardboard to insulate parts you aren't working on.

How thick is a nickel strip on a battery pack?

The nickel strip on the battery packs I have is approx 0.3mm thick and is nickel-coated steel strip. It is welded 4 times per cell per side (2 weld operations, 4 indents from the spot welding pins). The diameter of the indents is approximately 1mm or perhaps 0.8mm. My current approach: The pliers look like these:

How do you remove cells from a pack?

They are often required to remove individual cells from packs. They use a large box-cutter type knife and a hammer to cut the existing nickel or nickel-steel strip from the individual cells. This is the kind of knife with snap-off blade segments. You want to use the large style, not the small ones.

How do I remove a weld pit?

use a dremel with the blue grinder wheel to take the weld pits off. There might not be enough series connections, and that is a frequent source of voltage drop under load. The graph shows lots of little sags of a few volts that seems load related but one of the big 'box canyon' drops to 10V is with no load at all. Surely a bad connection?

Does LiIon battery pack use a BMS?

I'm having some troubles with my current liion battery pack (12S3P). This pack does not use a BMS for discharge (only for charging). I recently removed the wrapping en inspected all the nickel strip spotwelds that I could see from the outside. No signs of heat spots or sparks.