Lithium secondary battery and method of manufacturing the same
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsYoshio Moriwaki, Masakage Komori, Shingo Tsuda, Hidekazu Eguchi
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Abstract
The present invention uses a magnesium-based alloy which is excellent in mechanical workability to be formed thinner than conventional alloys. The present invention provides a lithium secondary battery comprising an electrode assembly and a non-aqueous electrolyte, both accommodated in a metal jacket, wherein the metal jacket is made of a magnesium-based alloy containing lithium in an amount of 7 to 20% by weight; and a metal layer or an insulating layer for preventing corrosion of the metal jacket is formed integrally with the metal jacket on the inner wall thereof.
Claims18
A lithium secondary battery comprising an electrode assembly and a non-aqueous electrolyte, both accommodated in a metal jacket,
- wherein said metal jacket is made of a magnesium-based alloy containing lithium in an amount of 7 to 20% by weight;
- and a metal layer for preventing corrosion of said metal jacket is formed integrally with said metal jacket on an inner wall thereof.
A lithium secondary battery comprising an electrode assembly and a non-aqueous electrolyte, both accommodated in a metal jacket,
- wherein said metal jacket is made of a magnesium-based alloy containing lithium in an amount of 7 to 15% by weight, and at least one element selected from the group consisting of Al, Zn, and Mn in a total amount of 0.3 to 5% by weight;
- a Ni layer having a thickness of 2 to 20 μm is formed integrally with said metal jacket on an inner wall thereof by cladding;
- and
- said metal jacket is electrically connected to a negative electrode in said electrode assembly.
A method of manufacturing a lithium secondary battery, comprising the steps of:
- (1) preparing a sheet of a magnesium-based alloy containing lithium in an amount of 7 to 15% by weight, and at least one element selected from the group consisting of Al, Zn, and Mn in a total amount of 0.3 to 5% by weight by thixomolding;
- (2) forming a Ni layer integrally with said sheet on at least one face thereof by cladding;
- (3) forming a metal jacket in a shape of a bottomed can with an open top with said Ni layer formed on an inner wall thereof from said sheet by a mechanical processing selected from drawing, combined drawing and ironing, and impact;
- and
- (4) placing an electrode assembly and a non-aqueous electrolyte into said metal jacket.
A lithium secondary battery comprising an electrode assembly and a non-aqueous electrolyte, both accommodated in a metal jacket,
- wherein said metal jacket is made of a magnesium-based alloy containing lithium in an amount of 7 to 20% by weight;
- and
- an insulating layer is formed integrally with said metal jacket on an inner wall thereof.
A lithium secondary battery comprising an electrode assembly and a non-aqueous electrolyte, both accommodated in a metal jacket,
- wherein said metal jacket is made of a magnesium-based alloy containing lithium in an amount of 7 to 15% by weight, and at least one element selected from the group consisting of Al, Zn, and Mn in a total amount of 0.3 to 5% by weight;
- and
- a resin layer having a thickness of 5 μm or more is formed integrally with said metal jacket on an inner wall thereof.
A method of manufacturing a lithium secondary battery, comprising the steps of:
- (1) preparing a sheet of a magnesium-based alloy containing lithium in an amount of 7 to 15% by weight, and at least one element selected from the group consisting of Al, Zn, and Mn in a total amount of 0.3 to 5% by weight by thixomolding;
- (2) forming a resin layer integrally with said sheet on at least one face thereof;
- (3) forming a metal jacket in a shape of a bottomed can with an open top with said resin layer formed on an inner wall thereof from said sheet by a mechanical processing selected from drawing, combined drawing and ironing, and impact;
- and
- (4) placing an electrode assembly and a non-aqueous electrolyte into said metal jacket.
A method of manufacturing a lithium secondary battery, comprising the steps of:
- (1) preparing a sheet of a magnesium-based alloy containing lithium in an amount of 7 to 15% by weight, and at least one element selected from the group consisting of Al, Zn, and Mn in a total amount of 0.3 to 5% by weight by thixomolding;
- (2) forming a metal jacket in a shape of a bottomed can with an open top from said sheet by a mechanical processing selected from drawing, combined drawing and ironing, and impact;
- (3) forming a resin layer integrally with said metal jacket on an inner wall thereof;
- and
- (4) placing an electrode assembly and a non-aqueous electrolyte into said metal jacket.
Dependencies are inferred from the claim text.