Louisville-based Solid Power partners with BMW

LOUISVILLE — Solid Power Inc., a maker of rechargeable batteries, is partnering with BMW Group.

The automotive giant is partnering with Louisville-based Solid Power to make solid-state batteries for electric vehicles.

Solid-state batteries have solid electrodes and electrolytes and are highly conductive, which minimizes internal resistance in the battery. The idea is that they have a long electric range with high safety and performance, compared with lithium-ion cells. Solid Power’s batteries are made with proprietary inorganic material without flammable or volatile components.

Through the partnership, BMW will help Solid Power advance its…