US 8,263,256 B2Granted

Cell

AssigneeSony Corporation

InventorsKazuhito Hatta, Mashio Shibuya

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Abstract

A highly safety cell is provided in which short-circuiting is unlikely to occur. In order to prevent short-circuiting, for example, burrs generated when a laminate film used as an exterior packaging material is cut are prevented from penetrating an interior resin layer of the laminate film. When an electrode terminal extension side of the laminate film is thermal welded, heating and compression are performed by a heater head on a part of the laminate film apart from the edge portion thereof so that the thickness of the above edge portion is larger than that of a thermal welded portion. In addition, thermal welding is performed so that the thickness of a thermal welded portion including an electrode terminal is larger than that of a thermal welded portion including no electrode terminal, and as a result, short-circuiting can be more effectively prevented.

Claims11

Dependent claims

A cell comprising:

a cell element including
(a) a positive electrode having a belt-shaped metal foil and reaction layers provided on two surfaces thereof,
(b) a negative electrode having a belt-shaped metal foil and reaction layers provided on two surfaces thereof, and
(c) an electrolyte;
a laminate film enclosing the cell element, the laminate film having a sealing portion and being composed of (a) an exterior resin layer, (b) an interior resin layer, and (c) a metal layer provided between the exterior resin layer and the interior resin layer, the sealing portion being thermal welded on a part of the laminate film apart from an edge portion thereof to form a thermal welded portion for sealing the cell;
electrode terminals electrically connected to the cell element and extending outside through the sealing portion;
and
sealant between the laminate film and the electrode terminals,
wherein,
a portion A of the laminate film, remote from an edge of the laminate film, is thermal welded, and a portion B at the edge portion of the laminate film is not thermal welded,
portion B increases in thickness along a lengthwise direction of the electrode terminals proceeding from the portion A to the edge of the laminate film,
a thickness of the sealant on the electrode terminals is less at said portion A than said portion B,
the edge of the laminate film on the electrode terminals is not thermal welded such that the edge of the laminate film is thicker than said portion A,
a thickness t2 of the laminate film at the edge thereof is larger than a thickness t1 of the thermal welded portion, and
when the thickness of the laminate film and the thickness of the interior resin layer are represented by t and p, respectively, the following equations are satisfied:
t×2-p×2+5<t1<t×2-5 (μm) and
t1<t×2≦t2 (μm).

14 more elements

A cell comprising:

a cell element including
(a) a positive electrode having a belt-shaped metal foil and reaction layers provided on two surfaces thereof,
(b) a negative electrode having a belt-shaped metal foil and reaction layers provided on two surfaces thereof, and
(c) an electrolyte;
a laminate film enclosing the cell element, the laminate film having a sealing portion and being composed of (a) an exterior resin layer, (b) an interior resin layer, and (c) a metal layer provided between the exterior layer and the interior resin layer, the sealing portion being thermal welded to form thermal welded portions for sealing the cell;
electrode terminals electrically connected to the cell element and extending outside through the sealing portion;
resin material layers covering the electrode terminals, and
sealant between the laminate film and the electrode terminals,
wherein,
a portion A of the laminate film, remote from an edge of the laminate film, is thermal welded, and a portion B at the edge portion of the laminate film is not thermal welded,
a thickness of the sealant on the electrode terminals is less at said portion A than said portion B,
a thickness of the portion B increases along a lengthwise direction of the electrode terminals proceeding from the portion A to the edge of the laminate film,
the edge of the laminate film on the electrode terminals is not thermal welded such that the edge of the laminate film is thicker than said portion A,
a thickness t4 of thermal welded portions including the electrode terminals is larger than a thickness t3 of thermal welded portions including no electrode terminals, and
when the thicknesses of the laminate film, the interior resin layer of the laminate film, the electrode terminal, and one side of each of the resin material layers covering the electrode terminals are represented by t, p, L, and S, respectively, the following equations are satisfied:
20<p<40 (μm),
t×2-p×2+5<t3<t×2-5 (μm), and
t×2-p×2+5+(L+S)<t4<t×2-5+(L+S) (μm).

15 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/289,191Filed 29 Nov 2005
Priority: JP P2004-35782010 Dec 2004
Published: US 2006/0127760 A115 Jun 2006
Granted: 11 Sep 2012
Term ends: Not estimatedThe source records don’t support an estimate.

Classification81 codes

H01M 50/124
Characterised by the material: having a layered structure
B29C 65/02
Joining or sealing of preformed parts , e.g. welding of plastics materials; Apparatus therefor: by heating, with or without pressure
B29C 65/08
By heating, with or without pressure: using ultrasonic vibrations
B29C 65/18
By heating, with or without pressure: using heated tools