The word gigafactory was coined by Tesla, who started building its first massive factory in 2014 in Nevada. The word corresponds to the scale of the output of these factories which is on the order of GWh of total battery capacity constructed per year. Now the word is used for all battery factories.
According to a study by Ultimate Media and ABB, the global battery production was 450 GWh in 2020. 77% is from the Asian market, 13% from Europe and 10% from the American continent. More that 75% of the production is from 7 giants, including LG, BYD, Panasonic, Samsung, etc. Only one non-Asian company was in the top 20, SAFT, a French branch of the TotalEnergies group (source).