Sealed battery, and vehicle equipped therewith

1. A sealed battery comprising:

a battery container that has an opening portion in at least an end portion of the battery container, and a container folded-back portion that is formed in a peripheral edge of the opening portion;

a lid body which has a lid body folded-back portion that is formed in an outer periphery of the lid body, and which is attached to the opening portion of the battery container;

a junction portion in which the container folded-back portion of the battery container and the lid body folded-back portion of the lid body are integrally joined with each other by a double-rolled seam method;

a first seal member that closes a first gap between a distal end portion of the container folded-back portion and an inside of a folded curve portion of the lid body folded-back portion, the container folded-back portion clamping a distal end portion of the lid body folded-back portion; and

a second seal member that closes a second gap between the distal end portion of the lid body folded-back portion and an inside of a folded curve portion of the container folded-back portion;

wherein the first seal member is separate from the second seal member.

2. The sealed battery according to claim 1 , wherein the first seal member and the second seal member are constructed of materials that are different from each other.

3. The sealed battery according to claim 2 , wherein one seal member of the first seal member and the second seal member in the junction portion, which is nearer from an interior of the battery container than another seal member of the first seal member and the second seal member, includes an electrolyte solution corrosion resistance material, the electrolyte solution corrosion resistance material of the one seal member being more resistant to electrolyte solution corrosion than a material of the other seal member.

4. The sealed battery according to claim 3 , wherein the electrolyte solution corrosion resistance material of the one seal member is a material which has moisture permeation resistance, and whose seal component is less easily eluted into an electrolyte solution even at high temperature.

5. The sealed battery according to claim 2 , wherein the sealed battery is used, with an external surface of the battery being in contact with a cooling medium, and wherein one seal member of the first seal member and the second seal member in the junction portion, which is farther from an interior of the battery container than another seal member of the first seal member and the second seal member, includes a cooling-medium corrosion resistance material, the cooling-medium corrosion resistance material of the one seal member being more resistant to cooling-medium corrosion than a material of the other seal member.

6. The sealed battery according to claim 5 , wherein the cooling medium includes oil, and the cooling-medium corrosion resistance material of the one seal member is a material that is more resistant to oil corrosion than the material of the other seal member.

7. The sealed battery according to claim 5 , wherein the cooling medium is a gas.

8. The sealed battery according to claim 5 , wherein the cooling medium is an aqueous solution containing a water-soluble polymer that is high in specific heat.

9. The sealed battery according to claim 1 , wherein the lid body is a metal-made lid body whose surface has an insulation layer, and an electrode terminal is attached to the lid body, and is electrically connected to an electrode body that includes a positive electrode and a negative electrode that are housed in the battery container.

10. The sealed battery according to claim 9 , wherein the insulation layer is constructed of a metal oxide film made from a metal that constitutes the lid body.

11. The sealed battery according to claim 9 , wherein the insulation layer is a resin coat that covers a surface of the lid body.

12. The sealed battery according to claim 1 , wherein the first seal member is disposed at a boundary between the container folded-back portion and the lid body folded-back portion.

13. The sealed battery according to claim 1 , wherein the second seal member is disposed at a boundary between the container folded-back portion and the lid body folded-back portion.

14. A vehicle comprising the sealed battery according to any one of claims 1 to 13 .

15. The sealed battery according to claim 1 , wherein in the junction portion, a surface of the lid body folded-back portion is in direct contact with a surface of the container folded-back portion.

16. A sealed battery comprising:

a battery container that has an opening portion in at least an end portion of the battery container, and a container folded-back portion that is formed in a peripheral edge of the opening portion;

a lid body which has a lid body folded-back portion that is formed in an outer periphery of the lid body, and which is attached to the opening portion of the battery container;

a junction portion in which the container folded-back portion of the battery container and the lid body folded-back portion of the lid body are integrally joined with each other by a double-rolled seam method;

a first seal member that closes a first gap between a distal end portion of the container folded-back portion and an inside of a folded curve portion of the lid body folded-back portion, the container folded-back portion clamping a distal end portion of the lid body folded-back portion; and

a second seal member that closes a second gap between the distal end portion of the lid body folded-back portion and an inside of a folded curve portion of the container folded-back portion;

wherein the first seal member and the second seal member are constructed of materials that are different from each other.