NASHVILLE, Tenn. (AP) — A joint venture between General Motors and South Korean battery company LG Energy Solution says it will invest an additional $275 million to expand a Tennessee battery cell factory for electric vehicles. Officials with the companies had already pledged to spend $2.3 billion to build a battery plant in Spring Hill, Tennessee. The additional investment announced Friday is anticipated to result in 40% more battery cell output when the plant is fully operational. Production at the 2.8-million-square-foot facility is expected to begin in late 2023. The Tennessee plant is one of three lithium-ion battery factories being built by the joint venture, Ultium Cells LLC.