Energy storage cell and method of manufacturing such an energy storage cell

Patent metadata

Field	Value
Publication number	US-2026088367-A1
Application number	US-202319106645-A
Country	US
Kind code	A1
Filing date	Aug 28, 2023
Priority date	Sep 1, 2022
Publication date	Mar 26, 2026
Grant date	—

Abstract

An energy storage cell includes an electrode-separator assembly comprising a ribbon-shaped anode, a ribbon-shaped cathode, and a separator. The anode and the cathode are formed and/or arranged within the electrode-separator assembly, which is formed as a cylindrical winding with a first terminal end face and a second terminal end face, such that a free edge strip of a cathode current collector or a free edge strip of an anode current collector protrudes from the first terminal end face. The energy storage cell further includes a housing closed in an airtight and liquid-tight manner and enclosing an interior space in which the electrode-separator assembly is arranged. The housing includes a metallic housing cup and a lid assembly. The lid assembly includes a metallic contact element. The free edge strip protruding from the first terminal end face is welded to the contact element of the lid assembly.

First claim

1 . : An energy storage cell, comprising:
an electrode-separator assembly comprising a ribbon-shaped anode, a ribbon-shaped cathode, and a separator with the sequence anode/separator/cathode, the anode comprising a ribbon-shaped anode current collector with a first longitudinal edge and a second longitudinal edge parallel thereto, the ribbon-shaped anode current collector comprising a main region loaded with a layer of a negative electrode material and a free edge strip extending along the first longitudinal edge and being not loaded with the negative electrode material, the cathode comprising a ribbon-shaped cathode current collector with a first longitudinal edge and a second longitudinal edge parallel thereto, the ribbon-shaped cathode current collector comprising a main region loaded with a layer of a positive electrode material and a free edge strip extending along the first longitudinal edge and being not loaded with the positive electrode material, the anode and the cathode being formed and/or arranged within the electrode-separator assembly, which is formed as a cylindrical winding with a first terminal end face, a second terminal end face, and a winding shell between the first and second terminal end faces, such that the free edge strip of the cathode current collector or the free edge strip of the anode current collector protrudes from the first terminal end face; and a housing closed in an airtight and liquid-tight manner and enclosing an interior space in which the electrode-separator assembly is arranged, the housing comprising a metallic housing cup with a terminal circular opening and a lid assembly with a circular edge that closes the circular opening, wherein the lid assembly comprises an annular seal of an electrically insulating material surrounding its circular edge, a metallic contact element, a metallic membrane electrically coupled to the contact element and which is configured to bulge or burst outwards from a defined excess pressure inside the housing, and a metallic pole cap electrically coupled to the metallic membrane, wherein the housing cup comprises, in axial sequence, a bottom, a central section and a closure section, wherein the central section is formed as a cylinder and in the central section the winding shell of the electrode-separator assembly formed as a winding is in contact with the inside of the housing cup, and wherein, in the closure section, the annular seal is in press contact with the lid assembly and the inside of the housing cup, and wherein the free edge strip protruding from the first terminal end face is welded to the contact element of the lid assembly.

2 . The energy storage cell of claim 1 , wherein at least one of:
the ribbon-shaped electrodes are formed and/or arranged within the electrode-separator assembly such that one of the free edge strips of the anode current collector and cathode current collector protrudes from the first terminal end face and the other of the free edge strips protrudes from the second terminal end face of the electrode-separator assembly; and/or the other of the free edge strips protruding from the second terminal end face of the electrode-separator assembly is electrically coupled to the bottom of the housing cup.

3 . The energy storage cell according to claim 1 , wherein at least one of:
the membrane is in direct contact with the contact element and is connected to it by welding; the membrane has a circular shape and a circular edge; the contact element has a circular shape and a circular edge; the contact element is welded to the center of the membrane; the contact element and the membrane have approximately the same diameter; and/or the membrane and the contact element are in electrical contact with each other exclusively via a welding area in the center of the membrane.

4 . The energy storage cell according to claim 1 , wherein at least one of:
the annular seal encloses the circular edge of the contact element; the annular seal encloses the circular edge of the membrane; and/or the annular seal separates the circular edge of the membrane from the circular edge of the contact element.

5 . The energy storage cell according to claim 1 , wherein at least one of:
the central section and the closure section are separated from each other by a radial indentation that circumferentially surrounds the outside of the housing cup. the free edge strip protruding from the first terminal end face is wider than a distance d between the central section and the closure section, such that the edge strip bridges the distance d and is in direct contact with the contact element; and/or the distance d is defined by an upper edge and a lower edge of the indentation of the housing cup.

6 . The energy storage cell of claim 5 , wherein at least one of:
the free edge strip protruding from the first terminal end face of the electrode-separator assembly is pressed inwards towards the center of the housing cup in the region of the indentation of the housing cup; and/or in the region of the indentation, an electrically insulating material is arranged between the inside of the housing cup and the free edge strip protruding from the first terminal end face of the electrode-separator assembly, which electrically insulates the free edge strip from the electrical potential of the housing cup.

7 . The energy storage cell according to claim 1 , wherein at least one of:
the housing cup has an identical maximum outer diameter in the central section and the closure section; and/or in the region of the indentation, the outer diameter of the housing cup is reduced by 4 to 20 times the wall thickness of the housing cup in this region.

8 . The energy storage cell according to claim 1 , wherein at least one of:
the longitudinal edge along which the free edge strip, which protrudes from the first terminal end face of the electrode-separator assembly, extends, forms a surface on which the contact element lies flat or into which the contact element is pressed; the contact element is dimensioned such that it covers at least 40 of the first terminal end face; the contact element is a disk or a polygonal plate; the contact element has at least one aperture; the contact element has a preferably uniform thickness in a range from 50 μm to 600 μm; the contact element has two opposite flat sides and extends essentially in only one dimension; the contact element has at least one bead which appears on one flat side of the contact element as an elongate depression and on the opposite flat side as an elongate elevation, the contact element being pressed into the surface formed by the longitudinal edge with the flat side which bears the elongate elevation; and/or the contact element is welded to the longitudinal edge of the respective current collector in the region of the bead.

9 . The energy storage cell according to claim 1 ,
wherein one or more openings is/are formed in the center and/or at the edge of the pole cap.

10 . A method of manufacturing an energy storage cell having the features of claim 1 , the method comprising:
providing the housing cup having the circular opening and the electrode-separator assembly having the first end face and the second end face; inserting the electrode-separator assembly, second end face first, through the circular opening of the housing cup into the housing cup; arranging the metallic contact element on the first end face and fixing the metallic contact element in place by welding before or after inserting the electrode-separator assembly into the housing cup; placing the membrane and the pole cap on the contact element to form the lid assembly; and forming a weld between the membrane and the contact el

Assignees

• Varta Microbattery Gmbh

Inventors

• Stock Stefan
• Elmer Martin

Classifications

• H01M10/049

  Processes for forming or storing electrodes in the battery container · CPC title

• H01M4/75

  Wires, rods or strips · CPC title

• H01M50/536

  characterised by the method of fixing the leads to the electrodes, e.g. by welding · CPC title

• H01M50/119

  Metals · CPC title

• H01M50/184

  characterised by their shape or structure · CPC title