Manufacturing method for energy storage devices

Abstract

To provide a highly reliable method for manufacturing energy storage devices. [Solution] A method for manufacturing an energy storage device comprises an electrode body including a first electrode and a second electrode, the electrode body having a group of first electrode tabs arranged in a plurality of stacks of first electrode tabs connected to the first electrode, and further comprising a first conductive member connected to the group of first electrode tabs, comprising the steps of: manufacturing an electrode body having a group of first electrode tabs; forming a first joint where the first electrode tabs in the group of first electrode tabs are joined together; and forming a second joint where the first joint in the group of first electrode tabs and the first conductive member are joined together, wherein the step of forming the second joint includes wobbling an energy ray.

Claims

1. A method for manufacturing an energy storage device comprising an electrode body including a first electrode and a second electrode, wherein the electrode body has a group of first electrode tabs in which a plurality of first electrode tabs connected to the first electrode are stacked, and further comprises a first conductive member connected to the group of first electrode tabs, A step of manufacturing an electrode body having the first group of electrode tabs, A step of forming a first joint portion in which the first electrode tabs in the first electrode tab group are joined together, The process includes a step of forming a second joint in which the first joint in the first electrode tab group and the first conductive member are joined, A method for manufacturing an energy storage device, comprising the step of forming the second joint by wobbling an energy ray.

2. The method for manufacturing an energy storage device according to claim 1, wherein in the step of forming the second joint, the overlap rate of the wobbling irradiation is 0.5 or more.

3. A method for manufacturing an energy storage device according to claim 1 or 2, wherein in the step of forming the second joint, the energy ray is irradiated onto a specific region on the outer surface of the first electrode tab group, and then the energy ray is irradiated onto the specific region again.

4. A method for manufacturing an energy storage device according to claim 1 or claim 2, wherein, in the step of forming the second joint, a molten and solidified portion of a first thickness (T1) is formed in the first electrode tab group by irradiation with the energy ray, and a molten and solidified portion of a first depth (D1) is formed in the first conductive member, and the first depth (D1) is 0.3 times or more the first thickness (T1).

5. A method for manufacturing an energy storage device according to claim 1 or claim 2, wherein in the step of forming the second joint, the energy line is scanned from the root side to the tip side of the first electrode tab group.

6. The electrode body includes a first electrode body and a second electrode body, and the first electrode body and the second electrode body each have a first electrode tab and a group of first electrode tabs, The method for manufacturing the aforementioned energy storage device is: A step of manufacturing the first electrode body and the second electrode body, The first electrode body comprises the step of joining the first electrode tabs in the group of first electrode tabs together, The second electrode body comprises the step of joining the first electrode tabs in the first electrode tab group together, The process of assembling the first conductive member to the sealing plate, The first conductive member assembled to the sealing plate is joined to the first electrode tab group of the first electrode body and the first electrode tab group of the second electrode body by irradiation with an energy beam. A method for manufacturing an energy storage device according to claim 1 or claim 2, comprising the step of combining the first electrode body and the second electrode body into one by bending the first electrode tab group of the first electrode body and the first electrode tab group of the second electrode body.

7. The method for manufacturing an energy storage device according to claim 1 or claim 2, wherein the step of forming the second joint is performed by laser welding.

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