BUTTON CELLS AND METHOD OF PRODUCING SAME

• US 20170025703A1
• Filed: 10/03/2016
• Published: 01/26/2017
• Est. Priority Date: 02/09/2009
• Status: Active Grant

• Current Assignee: VARTA Microbattery GmbH (VARTA AG)
• Original Assignee: VARTA Microbattery GmbH (VARTA AG)
• Inventors: Pytlik, Eduard, Lindner, Jrgen, Barenthin, Ulrich, Gaugler, Winfried
• Granted Patent: US 9,799,913 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01M 10/0427 Button cells
• CPC Class Codes: H01M 10/0431 Cells with wound or folded electrodes H01M10/045 takes precedence
• CPC Class Codes: H01M 10/05 Accumulators with non-aqueous electrolyte H01M10/39 takes precedence
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/24 Alkaline accumulators
• CPC Class Codes: H01M 10/34 Gastight accumulators
• CPC Class Codes: H01M 10/345 Gastight metal hydride accumulators
• CPC Class Codes: H01M 50/109 of button or coin shape
• CPC Class Codes: H01M 50/124 having a layered structure
• CPC Class Codes: H01M 6/10 with wound or folded electrodes
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product
• CPC Class Codes: Y10T 29/49108 Electric battery cell making
• CPC Class Codes: Y10T 29/4911 including sealing

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.

Claims

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 thin 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 thin 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 thin 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.