This is a very interesting approach and I have never thought about breaking down batteries to their basics and using them again for a project like this. It is actually a great idea. I wonder if some of the electronics markets here have got into recycling these like that.
RE: Recycling from Lithium-ion accumulator (DE/EN)
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Recycling from Lithium-ion accumulator (DE/EN)
So here Germany unfortunately not, only private people and they build this powerwalls very large. Since we are talking about 40 to 60 kWh storage. With this, a house can live self-sufficiently.
About how many individual battery cells do you need for a wall of that size?
15kWh powerwall (deutsch)
Monster DIY Lithium Akku 45 kWh + 9 kW Solar (deutsch)