Abstract: Disclosed herein is a secondary battery. The second battery can includes an electrode assembly, an electrode lead attached to the electrode assembly, and case configured to accommodate the electrode assembly therein. A lead film can be disposed around a part of an outer surface of the electrode lead and interposed between the electrode lead and the case. A vent region can be formed in at least a part of the case. A vent member can be disposed in the vent region. The vent member can have a structure defining a thickness and contain a linear low-density polyethylene having a comonomer with a carbon number of 6 or more. The thickness can be more than 50 ?m and less than 200 ?m.

Abstract: Disclosed herein is a secondary battery, which includes an electrode assembly; an electrode lead attached to the electrode assembly; a case configured to accommodate the electrode assembly therein; a lead film formed 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 having a structure of three or more layers, wherein the vent member contains a linear low-density polyethylene having a comonomer with a carbon number of 6 or more in outermost layers and contains a resin having a higher melting point than the linear low-density polyethylene having a comonomer with a carbon number of 6 or more in a middle layer.

Abstract: Disclosed is a battery cell including a battery case having an accommodation portion in which an electrode assembly is mounted, and a sealing portion formed by sealing an outer periphery thereof. A gas discharge unit can be inserted into the sealing portion and fused together with the sealing portion. The gas discharge unit including a first layer and a second layer and having a folded structure based on a first border line such that the gas discharge unit is open toward the inside of the battery case and the first layer becomes an outer surface of the gas discharge unit. The first layer and the sealing portion being in contact with each other.

Abstract: Disclosed herein is a secondary battery with an electrode assembly including a positive electrode, a negative electrode and a separator interposed therebetween. A positive electrode tab may be connected electrically to a positive electrode lead and a negative electrode tab may be connected electrically to a negative electrode lead. The positive and negative electrode leads may be exposed to the outside through a sealing portion of a battery casing. A positive electrode insulation film and a negative electrode insulation film may be attached to a portion where each of the respective electrode leads contact the sealing portion. At least the positive electrode insulation film or the negative electrode insulation film may have a vent portion surface-treated with a non-adhesive material between the insulation film and the respective electrode lead at the portion where the electrode lead is attached.

Abstract: Disclosed is a battery cell, which includes a battery case having an accommodation portion in which an electrode assembly is mounted, and a sealing portion formed by sealing an outer periphery thereof by heat fusion; an electrode lead electrically connected to an electrode tab included in the electrode assembly and protruding out of the battery case via the sealing portion; and a lead film located at a portion corresponding to the sealing portion in at least one of an upper portion and a lower portion of the electrode lead, wherein the lead film has a dented portion recessed toward an inside of the battery case, and the dented portion is opened toward an outside of the battery case.

Abstract: Disclosed is a battery cell, which includes a battery case having an accommodation portion in which an electrode assembly is mounted, and a sealing portion formed by sealing an outer periphery thereof. A gas discharge portion can be inserted into the sealing portion. The gas discharge portion can protrude from the inside of the battery case toward the outside of the battery case. The gas discharge portion can include a non-adhesive layer and an adhesive layer located on the non-adhesive layer. The non-adhesive layer and the adhesive layer can be bent to be opened toward the inside of the battery case.

Abstract: Disclosed herein is a secondary battery. The secondary battery can include an electrode assembly, an electrode lead attached to the electrode assembly, a case configured to accommodate the electrode assembly, a lead film formed 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 having a structure of three or more layers including a first resin in a lowermost layer, a second resin in an uppermost layer, and a third resin in a middle layer. The second resin can be a resin having a higher melting point than the first resin, and the third resin can be a resin having a higher melting point than the second resin.

Abstract: Disclosed are a pouch-shaped battery cell including a pouch-shaped battery case made of a laminate sheet, an electrode assembly received in the pouch-shaped battery case, and a venting portion configured to discharge gas in the pouch-shaped battery case, wherein the pouch-shaped battery case is provided with an opening, and the opening is opened or closed by the venting portion attached to the inside of the opening, and wherein the venting portion is opened to rapidly discharge gas when pressure in the pouch-shaped battery cell increases and reversibly blocks the inside and the outside of the battery cell, and a method of manufacturing the same.

Abstract: A pouch film laminate for preparing a pouch type battery case accommodating an electrode assembly is provided. The pouch film laminate includes a sealant layer formed of a first polymer as an innermost layer, a surface protection layer formed of a second polymer as an outermost layer, an aluminum alloy thin film having a grain size of 10 ?m to 13 ?m, and a gas barrier layer laminated between the surface protection layer and the sealant layer, wherein the gas barrier layer has a thickness of 50 ?m to 70 ?m, and the sealant layer has a thickness of 70 ?m to 100 ?m.

Abstract: Disclosed is a battery cell, which includes a battery case having an accommodation portion accommodating an electrode assembly, and a sealing portion formed by sealing an outer periphery of the battery case; an electrode lead electrically connected to an electrode tab included in the electrode assembly and protruding out of the battery case via the sealing portion; and a lead film adjacent to the sealing portion in at least one of an first portion and a second portion of the electrode lead, wherein a surface-deformed portion is formed on an outer surface of the electrode lead, and the surface-deformed portion is located between the lead film and the electrode lead.

Abstract: A battery cell includes a battery case having an accommodation portion in which an electrode assembly is mounted, and a sealing portion formed by sealing an outer periphery thereof; an electrode lead electrically connected to an electrode tab of the electrode assembly and protruding out of the battery case; and a lead film located at a portion corresponding to the sealing portion in one of an upper portion and a lower portion of the electrode lead. The lead film has a dented portion recessed in an inner direction of the battery case. The dented portion is opened toward outside of the battery case. The sealing portion located on a gas inlet portion of the dented portion has a recessed sealing portion recessed outward from an inner side of the battery case, and the recessed sealing portion does not overlap with a part of the gas inlet portion on a plane.

Abstract: Disclosed is a battery cell, which includes a battery case having an accommodation portion in which an electrode assembly is mounted, and a sealing portion formed by sealing an outer periphery thereof by heat fusion; an electrode lead electrically connected to an electrode tab included in the electrode assembly and protruding out of the battery case via the sealing portion; and a lead film located at a portion corresponding to the sealing portion in at least one of an upper portion and a lower portion of the electrode lead, wherein the lead film has a dented portion formed at an inside thereof, and the dented portion extends via the sealing portion and is closed inside the lead film.

Abstract: Disclosed is a battery cell, which includes a battery case having an accommodation portion in which an electrode assembly is positioned, and a sealing portion formed by sealing an outer periphery of the battery case, an electrode lead electrically connected to an electrode tab included in the electrode assembly, the electrode lead protruding out of the battery case through the sealing portion, a lead film located on at least one of a first portion and a second portion of the electrode lead, the lead film adjacent to the sealing portion, and a getter unit positioned between the electrode lead and the sealing portion. The getter unit includes a first end positioned outside of the battery case and a second end positioned inside of the battery case. The first end is covered by the lead film and not covered by the sealing portion.

Abstract: Disclosed is a battery cell, which includes a battery case having an accommodation portion in which an electrode assembly is mounted, and a sealing portion formed by sealing an outer periphery thereof; an electrode lead electrically connected to an electrode tab included in the electrode assembly and protruding out of the battery case via the sealing portion; and a lead film located at a portion corresponding to the sealing portion in at least one of an upper portion and a lower portion of the electrode lead, wherein a non-adhesion portion is formed on an outer surface of the lead film, and the non-adhesion portion is configured to face an outer surface of the electrode lead.

Abstract: Disclosed is a method for manufacturing a secondary battery. According to the present invention, a problem of weakening durability of a pouch, which may occur in a process of forming cups having different depths in the pouch may be solved.

Abstract: The present invention relates to a pouch type battery case which includes a pouch film laminate including a sealant layer, a gas barrier layer, and a surface protection layer, wherein the sealant layer is formed of a first polymer as an innermost layer, the surface protection layer is formed of a second polymer as an outermost layer, and the gas barrier layer is laminated between the surface protection layer and the sealant layer and is formed of an aluminum alloy thin film having a thickness of 60 ?m to 100 ?m and a grain size of 10 ?m to 13 ?m.

Abstract: Disclosed are a secondary battery and a method for manufacturing the same. According to the present invention, since an external protrusion protruding from the outside of an exterior constituting a body of the secondary battery as a component through which a secondary battery according to a related art is electrically connected to external electric equipment is removed, the secondary battery may be reduced in volume under the same capacity.

Abstract: Disclosed herein is a pouch-shaped battery case configured to receive an electrode assembly having a separator interposed between positive and negative electrodes, together with an electrolytic solution, the pouch-shaped battery case including an outer coating layer defining an outer surface of the battery case and configured to protect the electrode assembly from an outside of the battery case, the outer coating layer made of a polymer resin, a metal barrier layer located between the outer coating layer and an inner surface of the battery case, the metal barrier layer having high moisture-blocking efficiency and high thermal conductivity, and an inner sealant layer located between the metal barrier layer and an inner surface of the battery case, the inner sealant layer made of a polymer resin that has high thermal fusibility, the metal barrier layer includes a first metal that has high formability and a second metal that has high rigidity.

Abstract: To solve the above problem, a venting device inserted into a sealing part of a pouch of a secondary battery according to the present invention includes: a housing inserted between confronting surfaces of the sealing part and sealed together with the sealing part; an element made of a metal and disposed in the housing and through which a passage is defined providing gas communication between an inside and an outside of the pouch; and a ball disposed at an outlet-side of the passage, the ball configured to open and close the passage, wherein, in the element, an edge of an inner circumference of a surface of the outlet-side of the passage is chamfered or filleted so as to face the ball, and the element includes: a surface treatment layer formed on the chamfered or filleted surface; and a layer made of a polymer and fused to the surface treatment layer.

Abstract: Disclosed herein is a secondary battery having a vent member. The secondary battery may include an electrode assembly, a case including an accommodation portion to receive the electrode assembly, an electrode lead attached to the electrode assembly and a vent member. The case may include a sealing portion to seal the electrode assembly therein. The sealing portion may include a sealant resin to form a seal around the electrode assembly. The electrode lead may extend away from the case along a first direction. The sealing portion may include an inclined sealing portion adjacent the electrode lead. The inclined sealing portion may extend along a second direction. The second direction may be non-orthogonal to the first direction. The vent member may be disposed in the inclined sealing portion. The vent member may include a vent resin having a lower melting point than the sealant resin.