Energy storage device and method of manufacturing energy storage device
AssigneeGS Yuasa International Ltd.
InventorsHirokazu Kambayashi, Kazuto Maeda
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Abstract
An energy storage device including: an electrode assembly and a positive electrode current collector, wherein the positive electrode current collector includes an electrode connecting portion connected to the electrode assembly, the electrode connecting portion includes a first portion and a second portion which has a smaller wall thickness than the first portion and is joined to the electrode assembly, and either one of the second portion or the electrode assembly includes a first convex portion projecting toward the other in a joined portion.
Claims20
An energy storage device, comprising:
- an electrode assembly which includes an electrode converged portion;
- and
- a current collector,
- wherein the electrode converged portion includes converged current collecting foils stacked in a stacking direction,
- wherein the current collector includes an electrode connecting portion connected to the electrode converged portion,
- wherein the electrode connecting portion includes a first portion and a second portion which has a smaller wall thickness than the first portion and is joined to the electrode assembly,
- wherein one of the second portion and the electrode converged portion includes a first convex portion projecting toward another of the second portion and the electrode converged portion in a joined portion in the stacking direction, and
- wherein the another of the second portion and the electrode converged portion includes a second convex portion that projects from the another of the second portion and the electrode converged portion away from the one of the second portion and the electrode converged portion in the stacking direction.
An energy storage device, comprising:
- an electrode assembly including converged current collecting foils stacked in a stacking direction;
- a current collector including an electrode connecting portion connected to the electrode assembly;
- and
- a cover member disposed at a position where the cover member and the electrode connecting portion sandwich the electrode assembly,
- wherein the electrode connecting portion includes a first portion and a second portion which has a smaller wall thickness than the first portion and is joined to the electrode assembly,
- wherein one of the second portion and the electrode assembly includes a first convex portion projecting toward another of the second portion and the electrode assembly in a joined portion in the stacking direction,
- wherein the another of the second portion and the electrode assembly includes a second convex portion that projects from the another of the second portion and the electrode assembly away from the one of the second portion and the electrode assembly in the stacking direction, and
- wherein the cover member includes a first cover portion and a second cover portion which has a smaller wall thickness than the first cover portion and is joined to the electrode assembly.
A method of manufacturing an energy storage device including an electrode assembly which includes an electrode converged portion, and a current collector including an electrode connecting portion connected to the electrode converged portion, the method comprising:
- forming a thin wall thickness portion having a smaller wall thickness than another portion on the electrode connecting portion;
- and
- joining the thin wall thickness portion and the electrode assembly to each other by plastic deformation,
- wherein the electrode converged portion is formed by converging current collecting foils stacked in a stacking direction,
- wherein one of the thin wall thickness portion and the electrode converged portion includes a first convex portion projecting toward another of the thin wall thickness portion and the electrode converged portion in a joined portion in the stacking direction, and
- wherein the another of the thin wall thickness portion and the electrode converged portion includes a second convex portion that projects from the another of the thin wall thickness portion and the electrode converged portion away from the one of the thin wall thickness portion and the electrode converged portion in the stacking direction.
Dependencies are inferred from the claim text.