PRISMATIC CELL AND PRODUCTION METHOD FOR THE SAME
First Claim
1. A prismatic cell comprising:
- a wound electrode body that includesa positive electrode sheet having a metal foil on which a positive active material has been applied,a negative electrode sheet having a metal foil on which a negative active material has been applied, andseparators intervening between the positive and negative electrode sheets,wherein current-collecting foil portions on which no positive or negative active materials have been applied are provided on both ends of the wound electrode body as positive and negative electrode connection parts, respectively, and the positive electrode sheet, the negative electrode sheet and the separators are wound in a flat or thin shape;
a container having a flat shape in cross-section, in which the wound electrode body is accommodated, the container having an opening;
a lid that seals the opening of the container;
positive and negative external terminals provided on the lid;
a positive electrode current-collecting collector member that electrically connects the positive electrode connection part of the positive electrode sheet to the positive external terminal, the positive electrode current-collecting collector member having forked connector leaves with connection surfaces in contact with front and back surfaces of the positive electrode connection part; and
a negative electrode current-collecting collector member that electrically connects the negative electrode connection part of the negative electrode sheet to the negative external terminal, the negative electrode current-collecting collector member having forked connector leaves with connection surfaces in contact with front and back surfaces of the negative electrode connection part, whereinon both ends of the wound electrode body in the direction of winding axis, a laminate of the positive electrode connection part and a laminate of the negative electrode connection part are separated into two laminates, respectively, by pushing the innermost periphery part outwardly in the direction of the flat container, respectively, and whereinthe connection surfaces of the forked connector leaves of the positive and negative electrode collector members, respectively, are welded to the respective outer peripheral surfaces of the separated laminates.
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Accused Products
Abstract
A wound electrode body is fabricated by laminating and winding positive and negative electrode sheets together with a separator therebetween for insulation. On both positive and negative electrode side ends of the wound electrode body, laminates of current-collecting foil layered portions of the electrode sheets are bent or folded f toward the outer peripheral side to be separated into two. The separated laminates and forked connector leaves are overlapped and clamped between an ultrasonic chip and an anvil. Then, they are welded. The forked connector leaves are arranged such that no opposing forked connector leaf is present in the direction of a line normal to the forked connector leaf, so that the anvil does not have to be cantilevered. This allows welding by using the ultrasonic chip and the anvil without interfering with the collector rs. As a result, the quality of welding is improved.
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Citations
6 Claims
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1. A prismatic cell comprising:
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a wound electrode body that includes a positive electrode sheet having a metal foil on which a positive active material has been applied, a negative electrode sheet having a metal foil on which a negative active material has been applied, and separators intervening between the positive and negative electrode sheets, wherein current-collecting foil portions on which no positive or negative active materials have been applied are provided on both ends of the wound electrode body as positive and negative electrode connection parts, respectively, and the positive electrode sheet, the negative electrode sheet and the separators are wound in a flat or thin shape; a container having a flat shape in cross-section, in which the wound electrode body is accommodated, the container having an opening; a lid that seals the opening of the container; positive and negative external terminals provided on the lid; a positive electrode current-collecting collector member that electrically connects the positive electrode connection part of the positive electrode sheet to the positive external terminal, the positive electrode current-collecting collector member having forked connector leaves with connection surfaces in contact with front and back surfaces of the positive electrode connection part; and a negative electrode current-collecting collector member that electrically connects the negative electrode connection part of the negative electrode sheet to the negative external terminal, the negative electrode current-collecting collector member having forked connector leaves with connection surfaces in contact with front and back surfaces of the negative electrode connection part, wherein on both ends of the wound electrode body in the direction of winding axis, a laminate of the positive electrode connection part and a laminate of the negative electrode connection part are separated into two laminates, respectively, by pushing the innermost periphery part outwardly in the direction of the flat container, respectively, and wherein the connection surfaces of the forked connector leaves of the positive and negative electrode collector members, respectively, are welded to the respective outer peripheral surfaces of the separated laminates. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification