Laminate-type power storage element and method of manufacturing the same

A laminate-type power storage element comprising:

• an exterior body shaped into a flat bag shape by laminating a pair of laminated films to weld a peripheral edge region, the pair of laminated films being formed by forming insulating resin layers on both surfaces of a metal foil base material;
• an electrode body sealed within the exterior body, the electrode body being constituted by laminating a sheet-shaped positive electrode and a sheet-shaped negative electrode via a separator;
• a strip-shaped positive electrode terminal plate coupled to the positive electrode and allowed to project outside the exterior body from one side of the exterior body;
• a strip-shaped negative electrode terminal plate coupled to the negative electrode and allowed to project outside the exterior body from the one side of the exterior body;
• and
• a pair of tab films welded on surfaces where the pair of laminated films oppose one another along the one side of the exterior body to mutually weld the pair of laminated films while sandwiching the positive electrode terminal plate and the negative electrode terminal plate,
• at least one of the pair of laminated films being formed into a shape such that a region where the tab films sandwich the positive electrode terminal plate and the negative electrode terminal plate is exposed.

A method of manufacturing a laminate-type power storage element, comprising:

• a tab film disposing step of disposing a tab film along a predetermined margin of a laminated film formed by forming insulating resin layers on both surfaces of a metal foil base material;
• an exterior body sealing step of disposing a pair of the laminated films so as to allow the respective tab films to oppose one another, sandwiching an electrode body between the pair of laminated films, the electrode body being constituted by laminating a sheet-shaped positive electrode coupled to a flat plate-shaped positive electrode terminal plate and a sheet-shaped negative electrode coupled to a flat plate-shaped negative electrode terminal plate via a separator, and performing thermocompression bonding on peripheral edge regions of the pair of laminated films in a state where the positive electrode terminal plate and the negative electrode terminal plate are allowed to project outside from the predetermined margin to seal the exterior body;
• and
• a tab film deforming step of selectively performing the thermocompression bonding on a part on which the positive electrode terminal plate and the negative electrode terminal plate are positioned in the peripheral edge regions of the pair of laminated films, deviating the tab film outward from the exterior body, covering an end surface of the laminated film with the tab film, and covering both front and back surfaces of respective base end portions of a positive electrode terminal portion and a negative electrode terminal portion with the tab films, the positive electrode terminal portion being a part allowed to project outside the exterior body in the positive electrode terminal plate, the negative electrode terminal portion being a part allowed to project outside the exterior body in the negative electrode terminal plate.