Secondary batteries

Abstract

The invention provides a method for manufacturing a secondary battery with improved volumetric density energy. [Solution] The secondary battery manufacturing apparatus 10 includes a transport unit 5 for transporting secondary batteries 20 having an outer casing 22, a plurality of contact rollers (for example, a first upstream contact roller 30, a second upstream contact roller 130, and a third upstream contact roller 230) with different contact angles that are provided on the transport path of the transport unit 5 and contact the edge 28 of the transported outer casing 22, and opposing rollers (for example, a first upstream opposing roller 40, a second upstream opposing roller 140, and a third upstream opposing roller 240) that are positioned opposite each of the contact rollers and, together with the contact rollers, bend the edge 28 of the outer casing 22.

Claims

1. A conveying unit that conveys laminate-type secondary batteries having a laminate outer casing along the conveying direction, Multiple contact rollers with different contact angles are provided in the transport path of the transport section and contact the edge sealing portion of the laminate exterior body being transported, Opposing each of the aforementioned contact rollers are opposing rollers that, together with the aforementioned contact rollers, bend the edge sealing portion of the laminated outer casing, A secondary battery manufacturing apparatus comprising: The plurality of contact rollers include a downstream contact roller located at the downstream end in the conveying direction, The opposing roller includes a downstream opposing roller positioned opposite the downstream contact roller, The downstream opposing roller has a portion of the same diameter having the same outer diameter, When viewed from the aforementioned transport direction, the edge seal portion of the laminate outer casing contacts one radial end of the portion of the same diameter with the base portion of the edge seal portion from the bending point. When viewed from the aforementioned transport direction, the rotation axis of the downstream contact roller is parallel to the thickness direction of the electrode body included in the secondary battery. A secondary battery manufacturing apparatus, wherein, when viewed from the aforementioned transport direction, the other radial end of the portion of the same diameter is located on the electrode body side relative to the one end of the portion of the same diameter, and the rotation axis perpendicular to the radial direction of the downstream opposing roller is inclined with respect to a direction perpendicular to the rotation axis of the downstream contact roller.

2. The downstream contact roller is an elastic pressing roller that presses from the outside toward the downstream opposing roller positioned in the gap of the edge seal portion of the bent laminate exterior body. The apparatus for manufacturing a secondary battery according to claim 1.

3. One of the contact roller and the opposing roller is provided with a restricting portion that restricts movement in a direction perpendicular to the conveying direction of the laminated outer casing. A secondary battery manufacturing apparatus according to claim 1 or claim 2.

4. The secondary battery manufacturing apparatus is an apparatus for forming a bent portion in the edge sealing portion, The secondary battery having the aforementioned bent portion, The electrode body and, The laminated outer casing, which is made of a laminate sheet, covers the electrode body, Equipped with, The laminated outer casing is A housing section for housing the electrode body, The edge seal portion is formed by welding the edges of the laminate sheets together, It has, The edge sealing portion has the bent portion which is formed by bending it relative to the main surface of the electrode body, The aforementioned folded portion is formed by folding the edge sealing portion at least twice. The first pressing load is 6.0 MPa or more. The folded portion has a facing surface that is opposite to the side surface of the housing portion, The secondary battery manufacturing apparatus according to claim 1 or claim 2, wherein the first pressing load represents the load required to press a part of the bent portion toward the side surface of the housing portion, thereby bringing the opposing surface into contact with the side surface of the housing portion.

5. The electrode body further comprises terminals electrically connected, The laminated outer casing further includes a terminal sealing portion that encloses and seals the terminals extending to the outside of the laminated outer casing, The bent portion has a facing surface that is opposite to the side surface of the housing portion and the terminal sealing portion, The terminal sealing portion has a convex welded portion formed by welding the overlapping portion of the laminate sheet to the side surface of the terminal sealing portion. The convex welded portion protrudes from the side surface toward the opposing surface, The second pressing load is 12.0 MPa or higher. The secondary battery manufacturing apparatus according to claim 4, wherein the second pressing load represents the load necessary to press the entire bent portion toward the side surface of the terminal seal portion, thereby crushing the convex welded portion and bringing the opposing surface into contact with the side surface of the terminal seal portion.

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