US 11,735,760 B2
Button cells and method of producing same
Eduard Pytlik, Ellwangen (DE); Jürgen Lindner, Ellwangen (DE); Ulrich Barenthin, Ellwangen (DE); and Winfried Gaugler, Ellwangen (DE)
Assigned to VARTA MICROBATTERY GMBH, Ellwangen (DE)
Filed by VARTA Microbattery GmbH, Ellwangen (DE)
Filed on Feb. 17, 2020, as Appl. No. 16/792,420.
Application 16/792,420 is a division of application No. 15/696,354, filed on Sep. 6, 2017, granted, now 11,233,264.
Application 15/696,354 is a division of application No. 15/283,568, filed on Oct. 3, 2016, granted, now 9,799,913.
Application 14/827,387 is a division of application No. 13/146,669, granted, now 9,153,835, previously published as PCT/EP2010/000787, filed on Feb. 9, 2010.
Application 15/283,568 is a continuation of application No. 14/827,387, filed on Aug. 17, 2015, granted, now 9,496,581.
Claims priority of application No. 10 2009 008 859.8 (DE), filed on Feb. 9, 2009; application No. 10 2009 030 359.6 (DE), filed on Jun. 18, 2009; and application No. 10 2009 060 788.9 (DE), filed on Dec. 22, 2009.
Prior Publication US 2020/0185755 A1, Jun. 11, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 6/12 (2006.01); H01M 6/46 (2006.01); H01M 4/00 (2006.01); H01M 6/10 (2006.01); H01M 6/08 (2006.01); H01M 10/04 (2006.01); H01M 10/05 (2010.01); H01M 10/0525 (2010.01); H01M 10/24 (2006.01); H01M 10/34 (2006.01); H01M 50/109 (2021.01); H01M 50/124 (2021.01)
CPC H01M 10/0431 (2013.01) [H01M 6/10 (2013.01); H01M 10/0427 (2013.01); H01M 10/05 (2013.01); H01M 10/0525 (2013.01); H01M 10/24 (2013.01); H01M 10/34 (2013.01); H01M 10/345 (2013.01); H01M 50/109 (2021.01); H01M 50/124 (2021.01); Y02E 60/10 (2013.01); Y02P 70/50 (2015.11); Y10T 29/4911 (2015.01); Y10T 29/49108 (2015.01)] 30 Claims
OG exemplary drawing
 
1. A method for producing a button cell, the method comprising:
providing 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;
providing a cell top, the cell top having a flat top area, a cell top casing having a first height, and a top edge forming a transition between the flat top area and the cell top casing, wherein at least a portion of the cell top casing is cylindrical;
providing an electrode-separator assembly winding, the electrode-separator assembly winding having:
a positive electrode formed from a first portion of a first metallic film or metallic mesh covered with a first electrode material, and
a negative electrode formed from a first portion of a second metallic film or metallic mesh covered with a second electrode material,
wherein:
the first portion of the first metallic film or metallic mesh covered with the first electrode material and the first portion of the second metallic film or metallic mesh covered with the second electrode material are connected to one another by a separator layer and wound up, along their length, in a spiral shape about an axis, and
a respective metallic film or metallic mesh includes a second portion, the second portion being a length of the respective metallic film or metallic mesh that is not covered with the electrode material and that serves as an output conductor, the respective metallic film or metallic mesh being the first metallic film or metallic mesh or the second metallic film or metallic mesh;
applying an electrically insulating seal at least to an outer portion of the cell top casing;
inserting the electrode-separator assembly winding into the cell top;
inserting the cell top into the cell cup to form a housing, wherein:
the flat top area is parallel to the flat bottom area,
the axis of the electrode-separator assembly winding is aligned at right angles to both the flat top area and the flat bottom area,
the respective metallic film or metallic mesh is bent such that the second portion of the respective metallic film or metallic mesh at least partially lies flat between an end face of the electrode-separator assembly winding and one of the flat bottom area or the flat top area, and
the cell top casing and the cell cup casing form an overlap area extending in a direction parallel to the axis of the electrode-separator assembly winding and having a second height, the second height being between 20% and 99% of the first height; and
applying, in a radial direction perpendicular to the axis of the electrode-separator assembly winding, a pressure on the cell cup casing so as to seal the housing,
wherein the portion of the cell top casing that is cylindrical forms at least a part of the overlap area.