Button cells and method of producing same

Patent metadata

Field	Value
Publication number	US-9799913-B2
Application number	US-201615283568-A
Country	US
Kind code	B2
Filing date	Oct 3, 2016
Priority date	Feb 9, 2009
Publication date	Oct 24, 2017
Grant date	Oct 24, 2017

Abstract

A button cell includes a housing cup and a top separated by a seal and forms a housing with parallel flat bottom and top areas, and an electrode-separator assembly including a flat positive and negative electrode and connected by one flat separator, wherein the electrodes are aligned essentially at right angles to the flat bottom and top areas and the assembly is a spiral winding having end faces defining side surfaces of the winding facing in an axial direction relative to the flat bottom and top areas, one of the electrodes connects to the flat bottom or top area via an output conductor including a foil resting between an end face of the winding and the flat top or bottom area, and at least one insulator preventing direct mechanical and electrical contact between the end faces of the winding and the flat bottom and top areas.

First claim

The invention claimed is:

1. A button cell comprising:
a housing cup and a housing top separated from one another by an electrically insulating seal and which form a housing with a flat bottom area and a flat top area parallel to it, and
an electrode-separator assembly within the housing comprising at least one positive and at least one negative electrode in the form of flat layers and connected to one another by at least one flat separator,
wherein
the electrode layers are aligned essentially at right angles to the flat bottom area and the flat top area and the electrode-separator assembly is a spiral winding having end faces defining side surfaces of the spiral winding facing in an axial direction relative to the flat bottom area and the flat top area,
one of the electrodes connects to the flat bottom area or the flat top area via an output conductor comprising a foil resting flat between an end face of the spiral winding and the flat top or the flat bottom area to which it is connected, and
at least one insulating means preventing direct mechanical and electrical contact between the end faces of the winding and the flat bottom and flat top areas.

2. The button cell according to claim 1 wherein the at least one insulating means is a flat layer composed of plastic.

3. The button cell according to claim 2 wherein the flat layer composed of plastic is a plastic film or a thin plastic disc.

4. A button cell comprising:
a housing cup and a housing top separated from one another by an electrically insulating seal and which form a housing with a flat bottom area and a flat top area parallel to it, and
an electrode-separator assembly within the housing comprising at least one positive and at least one negative electrode in the form of flat layers and connected to one another by at least one flat separator,
wherein
the electrode layers are aligned essentially at right angles to the flat bottom area and the flat top area and the electrode-separator assembly is a spiral winding having end faces defining side surfaces of the spiral winding facing in an axial direction relative to the flat bottom area and the flat top area,
one of the electrodes connects to the flat bottom area or the flat top area via an output conductor comprising a foil resting flat between an end face of the spiral winding and the flat top or the flat bottom area to which it is connected, and
at least one flat layer composed of plastic preventing direct mechanical and electrical contact between the end faces of the winding and the flat bottom and flat top areas.

5. The button cell according to claim 4 wherein the flat layers composed of plastic are plastic films and/or thin plastic discs.

6. A button cell comprising:
a housing cup and a housing top separated from one another by an electrically insulating seal and which form a housing with a flat bottom area and a flat top area parallel to it, and
an electrode-separator assembly within the housing comprising at least one positive and at least one negative electrode in the form of flat layers and connected to one another by at least one flat separator,
wherein
the electrode layers are aligned essentially at right angles to the flat bottom area and the flat top area and the electrode-separator assembly is a spiral winding having upper and lower end faces defining side surfaces of the spiral winding facing in an axial direction relative to the flat bottom area and the flat top area,
one of the electrodes connects to the flat bottom area or the flat top area via an output conductor comprising a foil resting flat between an end face of the spiral winding and the flat top or the flat bottom area to which it is connected, and
at least one insulating means preventing direct mechanical and electrical contact between 1) the upper end faces of the winding and the flat top area or 2) the end faces of the winding and the flat bottom area.

7. The button cell according to claim 6 wherein the at least one insulating means comprises a flat layer composed of plastic.

8. The button cell according to claim 7 wherein the flat layer composed of plastic is a plastic film or a thin plastic disc.

Assignees

• Varta Microbattery Gmbh

Inventors

• Pytlik Eduard
• LINDNER Jürgen
• Barenthin Ulrich
• Gaugler Winfried

Classifications

• H01M50/572

  Means for preventing undesired use or discharge · CPC title

• H01M6/10

  with wound or folded electrodes · CPC title

• H01M10/0587

  of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title