A button-type secondary battery includes an electrode assembly in which a negative electrode, a separator, and a positive electrode are layered wound in a state of being layered; a lower can in which the electrode assembly is mounted, and a space portion is defined as a surplus space in addition to a space in which the electrode assembly is mounted; an upper can coupled to the lower can to close the lower can in a state in which the electrode assembly is mounted in the lower can, and an electrolyte is injected; and a swelling member mounted in the lower can in a state of being coupled to an outer surface of the electrode assembly. When the electrolyte is injected, the swelling member absorbs the electrolyte to be expanded in volume within the space portion.

A cap assembly having an improved structure to block or reduce the discharge of heated active material in a situation such as gas release is coupled to an open end of a battery can, and includes a top cap disposed on an uppermost portion of the cap assembly in a protrusive form to form a positive electrode terminal; a safety vent disposed below the top cap to deform a shape when an internal pressure of the battery can increases; a gasket configured to surround edges of the top cap and the safety vent; and a screen member interposed between the top cap and the safety vent and having an edge surrounded by the gasket, the screen member being at least partially configured in a mesh form.

A cap assembly having an improved structure to block or reduce the discharge of heated active material in a situation such as gas release is coupled to an open end of a battery can, and includes a top cap disposed on an uppermost portion of the cap assembly in a protrusive form to form a positive electrode terminal; a safety vent disposed below the top cap to deform a shape when an internal pressure of the battery can increases; a gasket configured to surround edges of the top cap and the safety vent; and a screen member interposed between the top cap and the safety vent and having an edge surrounded by the gasket, the screen member being at least partially configured in a mesh form.

A battery module containing: at least two battery assemblies, each battery assembly including a plurality of cells with two poles at opposing ends and arranged laterally in one row next to each other so that a pole of a cell is next to a pole of a neighboring cell, and each battery assembly including a plurality of interconnectors connecting a pole of a cell to pole of a neighboring cell; a housing arranged to accommodate the at least two battery assemblies and forming a respective continuous space around each row of poles allowing for fluid flow, and comprising containing an inlet opening and an outlet opening for each continuous space formed; and a pair of electric module terminals for connecting the battery assemblies to the outside, each electric module terminal being arranged thermally closer to one of the inlet openings than to an outlet opening.

Disclosed is a button battery or cylindrical battery, including: a first shell (1), the first shell (1) comprising a first annular sidewall (11) and a first end cover (12), wherein the first annular sidewall (11) is hermetically provided with the first end cover (12) at one end and is open at the other end; a second shell (2), the second shell (2) comprising a second annular sidewall (21) and a second end cover (22), wherein the second annular sidewall (21) is hermetically provided with the second end cover (22) at one end and is open at the other end; the first shell (1) and the second shell (2) are connected together with their open ends opposite to each other, the first annular sidewall (11) is sleeved outside the second annular sidewall (21), an insulating sleeve (3) is provided between the first annular sidewall (11) and the second annular sidewall (21), a first annular protrusion (23) protruding toward the insulating sleeve (3) is formed in the circumferential direction of the outer surface of the second annular sidewall (21), and the first annular protrusion (23) abuts against the insulating sleeve (3).

A rechargeable battery according to an exemplary embodiment of the present invention includes: an electrode assembly including a first electrode, a second electrode, and a separator positioned between the first electrode and the second electrode; a case having an internal space accommodating the electrode assembly and an opening with one opened side; a cap plate coupled to the opening of the case and having a terminal hole exposing the internal space; and an electrode terminal electrically connected to the electrode assembly through the terminal hole and overlapping the cap plate, wherein the separator has a greater width than the first electrode and the second electrode, and the separator is in contact with the internal bottom surface of the case.

A power storage device packaging material includes a structure including at least a substrate layer, an adhesive layer, a metal foil layer, a sealant adhesive layer, and a sealant layer, which are laminated in this order, wherein the adhesive layer has a yield stress in the range of 3500 to 6500 N/cm.sup.2 and breaking elongation of 45 to 200% in a stress-strain curve determined by a tensile test at a tension rate of 6 mm/min. A power storage device packaging material according to the second aspect of the present disclosure includes a structure including at least a substrate layer, an adhesive layer, a metal foil layer, an anticorrosion treatment layer, a sealant adhesive layer, and a sealant layer, which are laminated in this order, wherein the adhesive layer has a glass transition temperature in a range of 140° C. or more and 160° C. or less.

A secondary battery includes: a cylindrical can including a first region, a second region, and a first bent portion extending between the first region and the second region on a circumferential surface of the can; an electrode assembly accommodated in the can; and a cap assembly at a top end of the can and sealing the can. The first bent portion is bent such that an angle between the first region and the second region is in a range of about 90° to about 100°; the first region of the can partially covers a top surface of the cap assembly facing an exterior side of the can, and the second region of the can surrounds side surfaces of the cap assembly.

A method for producing a battery includes depositing, via sputter deposition, a coating on at least a portion of a cup shaped first housing part of the battery. The coating includes aluminium, chromium, tin, and/or an alloy having two or more of the group consisting of aluminium, chromium, and tin. The method also includes establishing an electrical connection between a current conductor of the battery and the cup-shaped first housing part of the battery and assembling the cup-shaped first housing part of the battery and a second housing part of the battery to form a housing of the battery. The housing has an interior space that includes a composite body including a positive electrode, a negative electrode, a separator, and the current conductor. The cup-shaped first housing part has a circular or oval bottom and a ring-shaped side wall.

A method for producing a battery includes depositing, via sputter deposition, a coating on at least a portion of a cup shaped first housing part of the battery. The coating includes aluminium, chromium, tin, and/or an alloy having two or more of the group consisting of aluminium, chromium, and tin. The method also includes establishing an electrical connection between a current conductor of the battery and the cup-shaped first housing part of the battery and assembling the cup-shaped first housing part of the battery and a second housing part of the battery to form a housing of the battery. The housing has an interior space that includes a composite body including a positive electrode, a negative electrode, a separator, and the current conductor. The cup-shaped first housing part has a circular or oval bottom and a ring-shaped side wall.