Abstract: Disclosed is a secondary battery, comprising an electrode assembly; an electrode lead attached to the electrode assembly; a case including a receiving portion in which the electrode assembly is received such that a part of the electrode lead is exposed, and a sealing portion configured to seal up the electrode assembly; and a gas adsorption element disposed in the receiving portion, wherein the gas adsorption element includes a gas adsorption film in which a gas adsorption material is dispersed in a polyolefin matrix resin in a predetermined weight range.

Abstract: A secondary battery and a battery pack including the same are provided. The secondary battery includes an electrode assembly extending in a first direction; an exterior film surrounding a portion of the electrode assembly; and a pair of caps covering a remaining portion of the electrode assembly, wherein each of the caps includes a cover part covering one side of the electrode assembly in the first direction; a connection part including a coupling portion which is provided on an outer surface of the cover part and is coupled to the exterior film; and a terminal part of which at least a portion is exposed to outside of the cover part and which is electrically connected to the electrode assembly, wherein the coupling portion of the connection part includes a first layer including a first resin and has an outer surface that couples to an inner surface of the exterior film and an inner surface that couples to an outer surface of the cover part.

Abstract: The present disclosure relates to a secondary battery, a method for manufacturing the same, and a battery pack including the same. The secondary battery according to an aspect of the present disclosure may include: an electrode assembly extending in a first direction; an exterior film surrounding a portion of the electrode assembly; and a pair of caps covering a remaining portion of the electrode assembly, wherein each cap may include: a cover part that covers one side of the electrode assembly in the first direction; a connection part including a coupling portion provided on an outer surface of the cover part and coupled to the exterior film; and a terminal part, wherein at least a portion of the terminal part is exposed outside of the cover part and is electrically connected to the electrode assembly.

Abstract: Disclosed herein is a gas release member and a secondary battery including same. The gas release member can include a sheet having gas permeability. The gas release member can have a hole in a peripheral region of the sheet. The secondary battery can include an electrode assembly and a case accommodating the electrode assembly. The secondary battery can include the gas release member adhered to an inner side of an opening of the secondary battery.

Abstract: The present invention relates to a metal foil fatigue test apparatus and a metal foil fatigue test method using the same. The metal foil fatigue test apparatus includes: a metal foil moving unit including an unwinding roll, from which a metal foil is unwound, a plurality of guide rolls configured to support and transfer the metal foil supplied from the unwinding roll, and a rewinding roll where the metal foil transferred from the guide rolls is wound; and a tensile strength measuring unit configured to measure tensile strength of the metal foil.

Abstract: Disclosed herein is a secondary battery having a vent member. The secondary battery may include an electrode assembly to which an electrode lead is attached, a case including an accommodation portion. The accommodation portion may be defined by a bent side and a sealing portion. The accommodation portion may be configured to receive the electrode assembly and seal the electrode assembly therein. The sealing portion may contain a sealant resin to form a seal around the electrode assembly. The sealing portion may include an extension adjacent to and extending from the bent side. The vent member may be disposed at least partially in the extension. The vent member may include a vent resin having a lower melting point than the sealant resin.

Abstract: A negative electrode current collector for a lithium metal battery, including copper and having a sum of S(110) and S(100) of 50% or more, wherein the S(110) is a ratio of a region occupied by a (110) surface of copper based on an entire region occupied by copper at a surface of the negative electrode current collector, and the S(100) is a ratio of a region occupied by a (100) surface of copper based on an entire region occupied by copper at a surface of the negative electrode current collector.

Abstract: Disclosed herein is a high-strength battery case with improved crack resistance during molding and greater protection against external impact. The battery case may be composed a pouch-type battery case with a pouch film laminate body including a gas barrier layer, a base layer on one surface and a sealant layer on the other surface of the gas barrier layer. At least one cup portion of the battery case can have a recessed shape so as to accommodate an electrode assembly, and a terrace positioned in at least a portion of the circumference of the cup portion. The cup portion may includes a bottom surface and a plurality of circumference surfaces surrounding the bottom surface. A thickness of the gas barrier layer is may be greater than 30 ?m at a corner at which the bottom surface comes in in contact with a pair of circumferences adjacent to each other.

Abstract: The present invention relates to a metal foil fatigue test apparatus and a metal foil fatigue test method using the same. The metal foil fatigue test apparatus includes: a metal foil moving unit including an unwinding roll, from which a metal foil is unwound, a plurality of guide rolls configured to support and transfer the metal foil supplied from the unwinding roll, and a rewinding roll where the metal foil transferred from the guide rolls is wound; and a tensile strength measuring unit configured to measure tensile strength of the metal foil.

Abstract: A secondary battery configured to have a structure in which an electrode assembly is received in a battery case together with an electrolytic material, wherein the battery case is provided therein with a space for receiving the electrode assembly and wherein the battery case is made of a thermoplastic resin, which can be injection-molded. An injection mold may be formed such that the size of the mold corresponds to the thickness of the electrode, thereby solving a problem in which the formability of a conventional laminate sheet including a metal layer is low. In addition, a process of forming the laminate sheet and a process of sealing the battery case using a pressing member, which are essentially required in order to use the laminate sheet, may be omitted, whereby a manufacturing process is simplified and thus productivity is improved.

Abstract: The secondary battery includes an electrode assembly to which an electrode lead is attached; a case configured to receive the electrode assembly therein; a lead film configured to surround a part of an outer surface of the electrode lead and interposed between the electrode lead and the case; a vent region formed in at least a part of the case; and a vent member inserted into the vent region and configured to contain linear low-density polyethylene having a poly dispersity index (PDI) of 4 or less, wherein the vent member has a maximum sealing strength of less than 6 kgf/15 mm at 100° C. or above and a maximum sealing strength of 6 kgf/15 mm or more at room temperature to 60° C.

Abstract: A method for manufacturing a pouch case for a secondary battery includes the steps of: (S1) preparing a pouch exterior for a secondary battery including a structure in which a substrate layer, a barrier layer, and a sealant layer are sequentially stacked; (S2) reducing a modulus of the sealant layer by 20-50%; and (S3) molding the pouch exterior for a secondary battery to form a cup part.

Abstract: The present invention relates to a pouch film laminate body capable of manufacturing a high-strength battery case with excellent resistance to external stress and a battery case manufactured using the same. The pouch film laminate body of the present invention includes a gas barrier layer having a thickness of 60 ?m or greater, a base layer disposed on one surface of the gas barrier layer, and a sealant layer disposed on the other surface of the gas barrier layer. The pouch film laminate layer has a tensile strength of 10 kgf/15 mm to 20 kgf/15 mm in a TD direction and an elongation of 150% to 235% in the TD direction.

Abstract: A method for manufacturing a pouch case for a secondary battery includes the steps of: (S1) preparing a pouch exterior for a secondary battery including a structure in which a substrate layer, a barrier layer, and a sealant layer are sequentially stacked; (S2) molding the pouch exterior for a secondary battery to form a cup part; and (S3) reducing cracks of the sealant layer of the pouch exterior for a secondary battery.

Abstract: A battery case for a secondary battery according to an embodiment of the present invention can include a cup part having an accommodation space configured to accommodate an electrode assembly in which electrodes and separators are stacked, a sealing part extending to the outside of the cup part, and a gas discharge part which is attached to a hole formed to be punched in at least one of the cup part or the sealing part and through which a gas passes. The gas discharge part can include a melted layer comprising a thermoplastic resin that is melted when heat is applied, and a thermosetting layer laminated on one surface of the melted layer and comprising a thermosetting resin that is not melted by heat.

Abstract: A pouch cell manufacturing method of the present disclosure prevents the sealing quality of a pouch from being deteriorated by an electrolyte solution, by reducing the amount of the electrolyte solution staining the sealing portion in the pouch, and a pouch cell in which gas inside the pouch can be efficiently discharged to the outside of the pouch is provided. The pouch cell of the present disclosure includes: an electrode assembly; a pouch within which the electrode assembly is accommodated; and a gas discharge pipe that is disposed such that the gas discharge pipe extends from the inside of the pouch to the outside, in which gas inside the pouch can be transmitted through the gas discharge pipe and discharged to the outside of the pouch.

Abstract: Disclosed is a secondary battery including: an electrode assembly including electrode sheets and a separator interposed between the electrode sheets; a pouch-like battery casing in which the electrode assembly is received; an electrode lead connected to the electrode assembly and protruding out from the battery casing; and a lead film covering the electrode lead and interposed between the electrode lead and the battery casing, wherein the lead film includes an outer layer covering the electrode lead and an inner layer disposed inside of the outer layer, and the inner layer includes a material having a higher air permeability as compared to the outer layer.

Abstract: Disclose herein is a pouch film laminate body including a gas barrier layer, a base layer disposed on one surface of the gas barrier layer, and a sealant layer disposed on the other surface of the gas barrier layer. A loop stiffness of the pouch film laminate body in machine direction of the pouch film laminate body may be 750 mN to 1300 mN.

Abstract: A pouch film according to an embodiment of the present invention includes a first polymer layer, an adhesive layer disposed on one surface of the first polymer layer, a gas barrier layer disposed on the adhesive layer and comprising a sintered body of metal particles, and a second polymer layer laminated on one surface of the gas barrier layer.

Abstract: A method of manufacturing a pouch-type secondary battery comprising the steps of: (a) preparing an electrode assembly having a separator interposed between a positive electrode and a negative electrode; (b) forming a receiving part for the electrode assembly in a case made of a laminate sheet; and (c) manufacturing a battery cell by receiving the electrode assembly in the receiving part and thermally fusing the case, wherein the laminate sheet comprises an outer resin layer, a metal barrier layer and an inner resin layer, the inner resin layer comprising polypropylene or polyethylene, and a crosslinking agent.