WASHINGTON — The U.S. Environmental Protection Agency has approved Ultium Cells LLC to build an electric vehicle battery component at the request of a bipartisan group of Michigan lawmakers. The joint venture between General Motors Co. and LG Energy Solution is building a battery plant in Delta Township outside of Lansing, Michigan, part of GM’s $7 billion investment in EV and battery production in Michigan announced in January. U.S. Reps. Elissa Slotkin, D-Michigan, and Tim Walberg, R-Michigan, along with the state’s Democratic U.S. Sens. Debbie Stabenow and Sen. Gary Peters, asked EPA in Apr…