Method of manufacturing battery, and battery
A battery comprises: a container including a bottom portion, long-sidewall portions each standing on a corresponding one of longer side portions of the bottom portion, short-sidewall portions each standing on a corresponding one of two shorter side portions of the bottom portion, and a welded portion in which portions of a flat plate are mutually welded; an electrode assembly housed in the container; an electrode terminal; and a lid closing the container, the container having a cuboid shape, the bottom portion being rectangular, the long-sidewall portions each being rectangular, the short-sidewall portions each being rectangular, the flat plate being made of metal and being folded, and the portions of the flat plate being mutually abutting or overlapping.
1. A battery, comprising:
a container consisting essentially of a metal plate as folded-over to form a bottom portion, long-sidewall portions each standing on a corresponding one of longer side portions of the bottom portion, and short-sidewall portions each standing on a corresponding one of shorter side portions of the bottom portion, the long-sidewall portions and the short-sidewall portions defining an opening portion opposite to the bottom portion, at least one of the short-sidewall portions including a first welded part that extends toward the opening portion;
an electrode assembly housed in the container;
a lid closing the opening portion; and
an electrode terminal.
2. The battery according to claim 1 , wherein the first welded part is located in said each of the short-sidewall portions.
3. The battery according to claim 1 , wherein a difference in a dimension between the bottom portion and the opening portion of the container is less than or equal to 1 mm.
4. The battery according to claim 1 , wherein a variation in a thickness of the long-sidewall portions is less than or equal to 1% of a maximum thickness of the long-sidewall portions.
5. The battery according to claim 1 , wherein said at least one of the short-sidewall portions further includes a second welded part, the first welded part being provided at an intermediate part of said each of the short-sidewall portions and extending in a direction intersecting a plane of the bottom portion, and the second welded part extending in a direction intersecting the first welded part and joining said each of the short-sidewall portions and the bottom portion.
6. The battery according to claim 1 , wherein said each of the long-sidewall portions includes a bulge portion which bulges inward of the battery.
7. The battery according to claim 1 , wherein the metal plate comprises abutting portions, and
wherein the abutting portions abut in a planar manner and are welded to each other in the first welded part.
8. The battery according to claim 1 , wherein the lid is welded to the container.
9. A battery, comprising:
a container consisting essentially of a metal plate that comprises abutting portions, the container including a bottom portion, long-sidewall portions standing on long sides of the bottom portion, short-sidewall portions standing on short sides of the bottom portion, the long-sidewall portions and the short-sidewall portions defining an opening opposite to the bottom portion, at least one of the short-sidewall portions including a first welded part that extends toward the opening;
an electrode assembly housed in the container; and
a lid closing the opening,
wherein the at least one of the long-sidewall portions and the short-sidewall portions that includes the first welded part further includes a second welded part extending in a direction intersecting the first welded part, and
wherein the abutting portions abut in a planar manner and are welded to each other in the first welded part.
10. The battery according to claim 9 , wherein the said at least one of the short-sidewall portions that includes the first welded part further includes a third welded part extending in the direction intersecting the first welded part.
11. The battery according to claim 10 , wherein the third welded part extends parallel to the second welded part.
12. The battery according to claim 11 , wherein the third welded part joins said each of the short-sidewall portions and the lid.
13. The battery according to claim 1 , wherein said at least one of the short-sidewall portions further includes a second welded part extending in a direction intersecting the first welded part, and
wherein the long-sidewall portions include the second welded part in a direction intersecting the short-sidewall portions.
14. The battery according to claim 13 , wherein the second welded part extends in a direction intersecting the first welded part, the second welded part joining said each of the short-sidewall portions and the bottom portion.
15. The battery according td claim 1 , wherein the first welded part is provided at an intermediate part of said each of the short-sidewall portions and extends in a direction intersecting a plane of the bottom portion.