US Patent 11588158 Electrochemical cell with electrode filled protrusion

An electrochemical cell comprises a can comprising a cylindrical side wall extending from a closed end wall. The closed end wall comprises a protrusion. The protrusion has a protrusion cavity therein. A pre-formed pellet of a first electrode material is disposed in the protrusion cavity. The electrochemical cell may further comprise a separator defining an inner cavity and separating the inner cavity from an outer cavity. The outer cavity is defined by the can and the separator. The electrochemical cell may further comprise a first electrode material disposed in the outer cavity; and a second electrode material disposed in the inner cavity.