Button cells and method of producing same

  • US 11,024,869 B2
  • Filed: 02/21/2020
  • Issued: 06/01/2021
  • Est. Priority Date: 02/09/2009
  • Status: Active Grant
First Claim
Patent Images

1. A button cell, comprising:

  • a housing, the housing including;

    a cell cup, the cell cup having a flat bottom area, a cell cup casing, and a bottom edge forming a transition between the flat bottom area and the cell cup casing, anda cell top, the cell top having a flat top area, a cell top casing, and a top edge forming a transition between the flat top area and the cell top casing;

    an electrode-separator assembly winding disposed within the housing, the electrode-separator assembly winding including a multi-layer assembly that is wound in a spiral shape about an axis, the multi-layer assembly including;

    a positive electrode formed from a first portion of a first metallic film or mesh coated with a first electrode material,a negative electrode formed from a first portion of a second metallic film or mesh coated with a second electrode material, anda separator disposed between the positive electrode and the negative electrode; and

    a first insulator,wherein the first metallic film or mesh is bent such that at least a second portion of the first metallic film or mesh extends out of the electrode-separator assembly winding and at least partially lies flat between (i) a first end face of the electrode-separator assembly winding and (ii) a first of the flat bottom area or the flat top area,wherein the first insulator is disposed between the first end face of the electrode-separator assembly winding and the second portion of the first metallic film or mesh,wherein at least a first part of the second portion of the first metallic film or mesh is not coated with the first electrode material and serves as an output conductor, andwherein the first part of the second portion of the first metallic film or mesh is welded to the first of the flat bottom area or the flat top area.

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