FLAT-SHAPED BATTERY

• US 20080248384A1
• Filed: 03/20/2008
• Published: 10/09/2008
• Est. Priority Date: 03/20/2007
• Status: Active Grant

• Current Assignee: Maxell, Ltd.
• Original Assignee: Hitachi Maxell Limited (Hitachi, Ltd.)
• Inventors: YABUSHITA, Noriyuki, Yamaguchi, Koji, Yoshiba, Toshikazu
• Granted Patent: US 9,899,640 B2
• Time in Patent Office: Days
• US Class Current: 429/185
• CPC Class Codes: H01M 50/109 of button or coin shape
• CPC Class Codes: H01M 50/153 for button or coin cells
• CPC Class Codes: H01M 50/183 Sealing members
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A flat-shaped battery of the present invention includes an outer can that is open upward, a sealing can that is open downward, and a gasket that is placed between the outer can and the sealing can to seal the space between them. The outer can includes a base plate and a cylindrical surrounding wall. The surrounding wall of the outer can includes a straight portion that extends upward and perpendicular to the base plate. The sealing can includes a housing in the form of an inverted dish, a flange that projects outward from a lower end of the opening of the housing, and a single outer surrounding wall that extends downward from an outside edge of the flange so as to be perpendicular to the flange. The outer surrounding wall of the sealing can is arranged perpendicular to the base plate of the outer can. The gasket includes a base that receives a lower end of the outer surrounding wall of the sealing can, and an outer cylindrical wall that extends upward from the base and is disposed between the surrounding wall of the outer can and the outer surrounding wall of the sealing can. The surrounding wall of the outer can has a curved edge such that the surrounding wall at the opening of the outer can is bent toward an axis of the outer can and positioned laterally with respect to the outer surrounding wall of the sealing can. The curved edge presses an upper end of the outer cylindrical wall of the gasket against an upper end of the outer surrounding wall of the sealing can.

Claims

1. A flat-shaped battery comprising:

an outer can that is open upward;

a sealing can that is open downward; and

a gasket that is placed between the outer can and the sealing can to seal a space between them,

wherein the outer can comprises a base plate and a cylindrical surrounding wall,

the surrounding wall of the outer can comprises a straight portion that extends upward and perpendicular to the base plate,

the sealing can comprises a housing in the form of an inverted dish, a flange that projects outward from a lower end of an opening of the housing, and a single outer surrounding wall that extends downward from an outside edge of the flange so as to be perpendicular to the flange,

the outer surrounding wall of the sealing can is arranged perpendicular to the base plate of the outer can,

the gasket comprises a base that receives a lower end of the outer surrounding wall of the sealing can, and an outer cylindrical wall that extends upward from the base and is disposed between the surrounding wall of the outer can and the outer surrounding wall of the sealing can,

the surrounding wall of the outer can has a curved edge such that the surrounding wall at an opening of the outer can is bent toward an axis of the outer can and positioned laterally with respect to the outer surrounding wall of the sealing can, and

the curved edge presses an upper end of the outer cylindrical wall of the gasket against an upper end of the outer surrounding wall of the sealing can.

2. The flat-shaped battery according to claim 1, wherein an end position of the curved edge of the surrounding wall of the outer can is located closer to the axis of the outer can than an inner surface of the outer surrounding wall of the sealing can,

a lateral distance from a first virtual extension surface of the inner surface of the outer surrounding wall of the sealing can to the end position of the curved edge is set within a range of 10% to 300% of a thickness of the outer surrounding wall of the sealing can, and

at a point on a curve where a second virtual extension surface of an outer surface of the outer surrounding wall of the sealing can intersects an outer surface of the surrounding wall of the outer can, an inclination angle between the second virtual extension surface and a tangential virtual plane contacting the point is set within a range of 65°

to 105°

when the angle is measured from the second virtual extension surface upward.

3. The flat-shaped battery according to claim 1, wherein a bend position at which the straight portion of the surrounding wall of the outer can starts to be bent is located higher than the lower end of the opening of the housing.

4. The flat-shaped battery according to claim 1, wherein the outer can comprises a recess where a central portion of the base plate curves downward and an annular peripheral portion surrounding the recess, and

the base of the gasket is in contact with the peripheral portion.

5. The flat-shaped battery according to claim 1, wherein the outer surrounding wall of the sealing can is tapered to be thinner at an opening.

6. A flat-shaped battery comprising:

an outer can that is open upward;

a sealing can that is open downward; and

a gasket that is placed between the outer can and the sealing can to seal a space between them,

wherein the outer can comprises a base plate and a cylindrical surrounding wall,

the surrounding wall of the outer can comprises a straight portion that extends upward and perpendicular to the base plate,

the sealing can comprises a housing in the form of an inverted dish, a flange that projects outward from a lower end of an opening of the housing, and a single outer surrounding wall that extends downward from an outside edge of the flange so as to be perpendicular to the flange,

the outer surrounding wall of the sealing can is arranged perpendicular to the base plate of the outer can,

the gasket comprises a base that receives a lower end of the outer surrounding wall of the sealing can, and an outer cylindrical wall that extends upward from the base and is disposed between the surrounding wall of the outer can and the outer surrounding wall of the sealing can,

the surrounding wall of the outer can has a curved edge such that the surrounding wall at an opening of the outer can is bent toward an axis of the outer can and positioned laterally with respect to the outer surrounding wall of the sealing can,

the curved edge presses an upper end of the outer cylindrical wall of the gasket against an upper end of the outer surrounding wall of the sealing can,

an end position of the curved edge of the surrounding wall of the outer can is located closer to the axis of the outer can than an inner surface of the outer surrounding wall of the sealing can,

a lateral distance from a first virtual extension surface of the inner surface of the outer surrounding wall of the sealing can to the end position of the curved edge is set within a range of 10% to 300% of a thickness of the outer surrounding wall of the sealing can, and

at a point on a curve where a second virtual extension surface of an outer surface of the outer surrounding wall of the sealing can intersects an outer surface of the surrounding wall of the outer can, an inclination angle between the second virtual extension surface and a tangential virtual plane contacting the point is set within a range of 65°

to 105°

when the angle is measured from the second virtual extension surface upward.

7. The flat-shaped battery according to claim 6, wherein a bend position at which the straight portion of the surrounding wall of the outer can starts to be bent is located higher than the lower end of the opening of the housing.

8. The flat-shaped battery according to claim 6, wherein the outer can comprises a recess where a central portion of the base plate curves downward and an annular peripheral portion surrounding the recess, and

the base of the gasket is in contact with the peripheral portion.

9. The frat-shaped battery according to claim 6, wherein the outer surrounding wall of the sealing can is tapered to be thinner at an opening.

10. A flat-shaped battery comprising:

an outer can that is open upward;

a sealing can that is open downward; and

a gasket that is placed between the outer can and the sealing can to seal a space between them,

wherein the outer can comprises a base plate and a cylindrical surrounding wall,

the surrounding wall of the outer can comprises a straight portion that extends upward and perpendicular to the base plate,

the sealing can comprises a housing in the form of an inverted dish, a flange that projects outward from a lower end of an opening of the housing, and a single outer surrounding wall that extends downward from an outside edge of the flange so as to be perpendicular to the flange,

the outer surrounding wall of the sealing can is arranged perpendicular to the base plate of the outer can,

the gasket comprises a base that receives a lower end of the outer surrounding wall of the sealing can, and an outer cylindrical wall that extends upward from the base and is disposed between the surrounding wall of the outer can and the outer surrounding wall of the sealing can,

the surrounding wall of the outer can has a curved edge such that the surrounding wall at an opening of the outer can is bent toward an axis of the outer can and positioned laterally with respect to the outer surrounding wall of the sealing can,

the curved edge presses an upper end of the outer cylindrical wall of the gasket against an upper end of the outer surrounding wall of the sealing can,

an end position of the curved edge of the surrounding wall of the outer can is located closer to the axis of the outer can than an inner surface of the outer surrounding wall of the sealing can,

a lateral distance from a first virtual extension surface of the inner surface of the outer surrounding wall of the sealing can to the end position of the curved edge is set within a range of 10% to 300% of a thickness of the outer surrounding wall of the sealing can,

at a point on a curve where a second virtual extension surface of an outer surface of the outer surrounding wall of the sealing can intersects an outer surface of the surrounding wall of the outer can, an inclination angle between the second virtual extension surface and a tangential virtual plane contacting the point is set within a range of 65°

to 105°

when the angle is measured from the second virtual extension surface upward, and

a bend position at which the straight portion of the surrounding wall of the outer can starts to be bent is located higher than the lower end of the opening of the housing.

11. The flat-shaped battery according to claim 10, wherein the outer can comprises a recess where a central portion of the base plate curves downward and an annular peripheral portion surrounding the recess, and

the base of the gasket is in contact with the peripheral portion.

12. The flat-shaped battery according to claim 10, wherein the outer surrounding wall of the sealing can is tapered to be thinner at an opening.

13. The flat-shaped battery according to claim 10, wherein the outer can comprises a recess where a central portion of the base plate curves downward and an annular peripheral portion surrounding the recess,

the base of the gasket is in contact with the peripheral portion, and

the outer surrounding wall of the sealing can is tapered to be thinner at an opening.