Manufacturing method of secondary batteries

Abstract

The present invention provides a method for manufacturing secondary batteries that enables the stable and efficient production of secondary batteries with high energy density and high reliability. [Solution] The method comprises the steps of: manufacturing an electrode body including a first electrode and a second electrode, having a group of first electrode tabs electrically connected to the first electrode at a first end and a group of second electrode tabs connected to the second electrode at a second end; electrically connecting the first electrode terminal provided on a first sealing plate to the group of first electrode tabs; joining the group of second electrode tabs to a first conductive member; inserting the electrode body into the case body from the second end side through a first opening after joining the group of second electrode tabs to the first conductive member; electrically connecting the second electrode terminal provided on a second sealing plate to the group of second electrode tabs; sealing the first opening with the first sealing plate after electrically connecting the first electrode terminal and the group of first electrode tabs; and sealing the second opening with the second sealing plate after electrically connecting the second electrode terminal and the group of second electrode tabs.

Claims

1. A step of preparing a case body having a first opening and a second opening facing the first opening, A step of manufacturing an electrode body comprising a first electrode and a second electrode having a polarity different from that of the first electrode, having a group of first electrode tabs electrically connected to the first electrode at a first end, and a group of second electrode tabs electrically connected to the second electrode at a second end opposite to the first end, A step of electrically connecting the first electrode terminal provided on the first sealing plate and the group of first electrode tabs, The steps include joining the second electrode tab group to the first conductive member, The process of covering the outer surface of the electrode body with an insulating sheet, After joining the second electrode tab group to the first conductive member, the electrode body is inserted into the case body from the second end side through the first opening, with the insulating sheet protruding from the main body of the electrode body in the direction in which the second electrode tab group protrudes and facing the second electrode tab group, A step of electrically connecting the second electrode terminal provided on the second sealing plate and the second electrode tab group, The first electrode terminal and the group of first electrode tabs are electrically connected, and the first opening is sealed with the first sealing plate. A method for manufacturing a secondary battery, comprising the steps of electrically connecting the second electrode terminal and the second electrode tab group, and then sealing the second opening with the second sealing plate.

2. A step of preparing a case body having a first opening and a second opening facing the first opening, A step of manufacturing an electrode body comprising a first electrode and a second electrode having a polarity different from that of the first electrode, having a group of first electrode tabs electrically connected to the first electrode at a first end, and a group of second electrode tabs electrically connected to the second electrode at a second end opposite to the first end, A step of electrically connecting the first electrode terminal provided on the first sealing plate and the group of first electrode tabs, The steps include joining the second electrode tab group to the first conductive member, The process of covering the outer surface of the electrode body with an insulating sheet, After joining the second electrode tab group to the first conductive member, the insulating sheet protrudes from the main body of the electrode body in the direction in which the second electrode tab group protrudes, and the insulating sheet is interposed between the second electrode tab group and the case body, and the electrode body is inserted into the case body from the second end side through the first opening, A step of electrically connecting the second electrode terminal provided on the second sealing plate and the second electrode tab group, The first electrode terminal and the group of first electrode tabs are electrically connected, and the first opening is sealed with the first sealing plate. A method for manufacturing a secondary battery, comprising the steps of electrically connecting the second electrode terminal and the second electrode tab group, and then sealing the second opening with the second sealing plate.

3. A method for manufacturing a secondary battery according to claim 1 or claim 2, wherein the step of electrically connecting the second electrode terminal and the second electrode tab group includes electrically connecting the first conductive member and the second electrode terminal after inserting the electrode body into the case body.

4. The method for manufacturing a secondary battery according to claim 3, wherein electrically connecting the first conductive member and the second electrode terminal includes joining the first conductive member to the second conductive member attached to the second sealing plate.

5. A method for manufacturing a secondary battery according to claim 1 or claim 2, wherein the step of electrically connecting the first electrode terminal and the first electrode tab group includes joining the first electrode tab group to a third conductive member before inserting the electrode body into the case body.

6. The method for manufacturing a secondary battery according to claim 5, wherein the step of electrically connecting the first electrode terminal and the group of first electrode tabs includes electrically connecting the third conductive member and the first electrode terminal before inserting the electrode body into the case body.

7. The method for manufacturing a secondary battery according to claim 6, wherein electrically connecting the third conductive member and the first electrode terminal includes joining the third conductive member to a fourth conductive member attached to the first sealing plate.

8. The first electrode tab group has a curved portion, and the tip side of the first electrode tab group is joined to the third conductive member. The method for manufacturing a secondary battery according to claim 5, wherein the region of the third conductive member joined to the first electrode tab group is arranged along the first sealing plate.

9. The second electrode tab group has a curved portion, and the tip end of the second electrode tab group is joined to the first conductive member. A method for manufacturing a secondary battery according to claim 1 or 2, wherein the region of the first conductive member joined to the second electrode tab group is arranged along the second sealing plate.

10. A method for manufacturing a secondary battery according to claim 1 or 2, wherein in the longitudinal direction of the second sealing plate, the length of the first conductive member is greater than the length of the tip of the second electrode tab group.

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