GM has officially begun Ultium EV battery production in the US as part of its $2.3 billion joint venture with LG Energy Solution. The JV’s 2.8-million square foot facility in Ohio is now assembling battery packs for the GMC Hummer EV, but remains hush on what other EVs in the GM family will receive them. Meanwhile, the American automaker continues to work through disputes as its battery factory employees look to unionize. More…