To make the battery cells, you have to go through the process of making the anode and cathode from the processed minerals. This all makes sense. You should create an ecosystem to avoid transporting the minerals, which would reduce CO2 emissions. The cells can be made in Quebec. Ontario can make the modules and battery packs.
Let's not forget that Quebec has Hydro-Québec and a lot of electrical energy. With this inexpensive green energy, Quebec could manufacture the cells and ship them to Ontario for the module and battery pack assembly.
I believe that this complementarity would be the best solution for both provinces.