US 6,746,798 B1Granted

Rectangular and sealed battery

AssigneeSony Corporation

InventorsMasaru Hiratsuka, Yoshinori Hashimoto, Takayuki Yamahira

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Abstract

A rectangular and sealed battery incorporating an outer can for accommodating a power generation element and a cover for closing an opening of the outer can such that the outer can and the cover are welded to each other. The thickness of a body portion of the outer can is smaller than the thickness of the opening. A flange formed into a stepped portion is provided for the outer end of the cover, and the end of the opening of the outer can is made contact with the outer surface of a projection of the cover formed by the stepped portion so as to be joined to the outer surface of the projection and butt-welded to the flange. In the foregoing case, the cover and the end of the opening of the outer can are welded to each other from a side direction.

Claims12

Dependent claims

A battery, comprising:

(a) an outer can, the can being rectangular, the outer can having a can wall having a can wall top end, the can wall having a can wall outer surface and a can wall inner surface, the can wall outer surface and can wall inner surface being parallel to each other;
(b) a can flange disposed at the can wall top end, the can flange having a can flange outer surface and a can flange inner surface, the can flange outer surface and inner surface being parallel to each other;
the can flange further including a can flange top surface perpendicular to the can flange inner surface;
(c) a cover having a cover top surface and a cover bottom surface;
(d) the cover further including a cover flange, the cover flange having a cover flange outer surface, a cover flange inner surface, a cover flange bottom surface, a cover flange top surface, a cover flange intermediate surface disposed between the cover flange inner and outer surfaces;
(e) wherein the cover flange top surface is parallel to the cover flange bottom surface;
and wherein the cover flange top surface is parallel to the cover bottom surface;
(f) wherein the cover flange inner surface is parallel to the cover flange outer surface;
(g) wherein the can flange inner surface is parallel to the cover flange intermediate surface;
(h) wherein the outer can is adapted to accommodate a power generation element, formed by winding a laminate of a positive electrode and a negative electrode separated by a separator:
wherein the outer can is adapted to accommodate an electrolyte;
wherein the electrolyte is dissolved in an organic solvent;
wherein the positive electrode comprises LixMO2 as an active material such that M comprises a transition metal;
X ranges from 0.05 to 1.10;
and wherein the negative electrode comprises carbonaceous material as an active material;
(i) the plane of the cover top surface is in the same plane as the can flange top surface;
and
(j) a junction between the cover bottom surface and the cover flange intermediate surface is chamfered.

15 more elements

A battery, comprising:

(a) an outer can, the can being rectangular, the outer can having a can wall having a can wall top end, the can wall having a can wall outer surface and a can wall inner surface, the can wall outer surface and can wall inner surface being parallel to each other;
(b) a can flange disposed at the can wall top end, the can flange having a can flange outer surface and a can flange inner surface, the can flange outer surface and inner surface being parallel to each other;
the can flange further including a can flange top surface perpendicular to the can flange inner surface;
(c) a cover having a cover top surface and a cover bottom surface;
(d) the cover further including a cover flange, the cover flange having a cover flange outer surface, a cover flange inner surface, a cover flange bottom surface, a cover flange top surface, a cover flange intermediate surface disposed between the cover flange inner and outer surfaces;
(e) wherein the cover flange top surface is parallel to the cover flange bottom surface;
and wherein the cover flange top surface is parallel to the cover bottom surface;
(f) wherein the cover flange inner surface is parallel to the cover flange outer surface;
(g) wherein the can flange inner surface is parallel to the cover flange intermediate surface;
(h) the plane of the cover top surface is in the same plane as the can flange top surface;
(i) wherein the plane of the cover top surface is perpendicular to the plane of the can flange inner surface;
wherein the plane of the cover flange bottom surface is perpendicular to the plane of the can flange inner surface;
and wherein the plane of the cover top surface is between the plane of the cover flange top surface and the plane of a can flange bottom surface;
and
(j) wherein the outer can is adapted to accommodate a power generation element, formed by winding a laminate of a positive electrode and a negative electrode separated by a separator;
wherein the outer can is adapted to accommodate an electrolyte;
wherein the electrolyte is dissolved in an organic solvent;
wherein the positive electrode comprises LixMO2 as an active material such that M comprises a transition metal;
X ranges from 0.05 to 1.10;
and
wherein the negative electrode comprises carbonaceous material as an active material;
and
(k) a junction between the cover bottom surface and the cover flange intermediate surface is chamfered.

20 more elements

A battery, comprising:

(a) an outer can, the can being rectangular, the outer can having a can wall having a can wall top end, the can wall having a can wall outer surface and a can wall inner surface, the can wall outer surface and can wall inner surface being parallel to each other;
(b) a can flange disposed at the can wall top end, the can flange having a can flange outer surface and a can flange inner surface, the can flange outer surface and inner surface being parallel to each other;
the can flange further including a can flange top surface perpendicular to the can flange inner surface;
(c) a cover having a cover top surface and a cover bottom surface;
(d) the cover further including a cover flange, the cover flange having a cover flange outer surface, a cover flange inner surface, a cover flange bottom surface, a cover flange top surface, a cover flange intermediate surface disposed between the cover flange inner and outer surfaces;
(e) wherein the cover flange top surface is parallel to the cover flange bottom surface;
and wherein the cover flange top surface is parallel to the cover bottom surface;
(f) wherein the cover flange inner surface is parallel to the cover flange outer surface;
(g) wherein the can flange inner surface is parallel to the cover flange intermediate surface;
(h) the plane of the cover top surface is in the same plane as the can flange top surface;
(i) wherein the plane of the cover top surface is perpendicular to the plane of the can flange inner surface;
(j) wherein the plane of the cover flange bottom surface is perpendicular to the plane of the can flange inner surface;
(k) wherein the plane of the cover top surface is between the plane of the cover flange top surface and the plane of a can flange bottom surface;
(l) wherein the plane of the cover bottom surface is between the plane of the can flange top surface and the plane of a can flange bottom surface;
(m) wherein the cover bottom surface has a cover bottom width slightly less than an inner can width, the inner can width being defined as the width between opposing can inner surface walls;
(o) wherein the outer can is adapted to accommodate a power generation element, formed by winding a laminate of a positive electrode and a negative electrode separated by a separator;
wherein the positive electrode comprises LixMO2 as an active material such that M comprises a transition metal and X ranges from 0.05 to 1.10, and wherein the negative electrode comprises carbonaceous material as an active material;
and
(p) wherein the active material of the positive electrode is formed on both sides of a charge collector of the positive electrode and the active material of the negative electrode is formed on both sides of a charge collector of the negative electrode;
(q) a junction between the cover bottom surface and the cover flange intermediate surface is chamfered;
and
(r) the cover further including a single through-hole connecting the cover bottom surface to the cover top surface, and a counter terminal extending into the single through-hole.

19 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/341,209Filed 23 Aug 1999
Priority: JP P9-3059607 Nov 1997
Granted: 8 Jun 2004
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H01M 50/169
Characterised by the methods of assembling casings with lids: by welding, brazing or soldering
H01M 10/0525
Li-accumulators: rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
H01M 50/103
Characterised by their shape or physical structure: prismatic or rectangular
H01M 2006/106
With wound or folded electrodes: elliptic wound cells