Abstract: Disclosed are a fuel cell catalyst of which only a portion, which has relatively low catalytic activity and in which the greatest amount of platinum elution occurs and platinum oxide is easily formed, is selectively coated with a protective layer, and thus degradation due to the long-term operation of a fuel cell can be effectively prevented while also minimizing a deterioration in catalytic activity; a manufacturing method therefor; and a membrane-electrode assembly including same. The fuel cell catalyst of the present invention comprises: a nanoparticle containing platinum; and a protective layer which is selectively coated on only a portion of the surface of the nanoparticle and can suppress the oxidation of the platinum through electronic interaction with the nanoparticle.

Abstract: A device for controlling a line connection type fuel cell system and a method for the same are provided. The device for controlling a line connection type fuel cell system includes a plurality of fuel cell modules, an Alternating Current (AC) voltage generator, and a controller to activate the AC voltage generator to generate an AC voltage corresponding to power supplied from a system, and to control the plurality of fuel cell modules to generate a current in synchronization with the AC voltage.

Abstract: A method of managing system health is provided. The method includes calculating a reconstruction missing value with respect to the second domain data, determining a degree of degradation of the system on the basis of the reconstruction missing value, predicting a second remaining useful life (RUL) prediction value {tilde over (y)} of the system on the basis of the second domain data, based on a result of the determination of the degree of degradation, optimizing a degradation compensation function on the basis of a distribution of a first RUL prediction value y of the system predicted based on the first domain data in a pre-learning process of the diagnosis model, and predicting a final RUL prediction value {tilde over (y)}? obtained by compensating for the second RUL prediction value {tilde over (y)}, by using the optimized degradation compensation function.

Abstract: A cylindrical battery case for a secondary battery includes a body having a steel sheet including a nickel coating layer formed thereon, a step portion on the body, and a taper and a flange extending from the body. A surface roughness (Ra) of the battery case ranges from 0.022 ?m to 0.040 ?m. Also provided is a device including such a secondary battery. The device is selected from a group consisting of an electronic device, an electric vehicle, a hybrid electric vehicle, and a power storage system.

Abstract: A method of manufacturing a cylindrical battery case includes performing an ironing process, which is one of the processes of manufacturing the battery case, a plurality of times in order to decrease the surface roughness of the battery case, thereby improving the corrosion characteristics of the battery case. The surface roughness of the cylindrical battery case is decreased by performing a thickness reducing process when a process for forming the outer circumferential surface of a body of the cylindrical battery case is performed at the time of manufacturing the cylindrical battery case. In addition, corrosion characteristics are improved for respective values of the surface roughness.

Abstract: An ultrasonic welding apparatus includes a housing; a horn part coupled to the housing and configured to transmit an ultrasonic wave in one direction; a tip part coupled to the horn part and configured to apply the ultrasonic wave transmitted from the horn part to an object to be welded, and to apply the ultrasonic wave at an angle of 80° or greater and 100° or less with respect to a direction in which the horn part transmits the ultrasonic wave; an anvil part configured to support the object to be welded; and a suction connected to the anvil part and configured to suck a foreign matter generated resulting from ultrasonic welding, in which the tip part is configured to be driven by linear vibration with respect to the object to be welded, and achieves the effects of easily removing foreign matter and improving welding quality.

Abstract: A secondary battery includes a jelly roll type electrode assembly in which a first electrode, a second electrode, and a separator are wound together; a battery case that houses the electrode assembly; and a swelling tape attached to the outer peripheral surface of the electrode assembly. The first electrode includes a first electrode current collector and a first active material layer formed by applying an electrode active material onto the first electrode current collector. The first electrode current collector includes an exposed portion exposed to the outer peripheral surface of the electrode assembly. The swelling tape brings the exposed portion into close contact with the inner wall of the battery case.

Abstract: Disclosed is a cylindrical battery cell configured such that the outer surface of a cylindrical case excluding electrode terminals is wrapped by a heat-shrinkable tube, wherein the heat-shrinkable tube includes a tube substrate made of a polyester-based resin, the tube substrate being heat-shrinkable; a reinforcement agent, made of a nylon-based resin, for increasing the tensile stress and operating temperature of the heat-shrinkable tube; and an ultraviolet (UV) absorber for absorbing ultraviolet rays radiated to the heat-shrinkable tube and emitting the absorbed ultraviolet rays as thermal energy to prevent the scission of polymer chains of the nylon-based resin or the polyester-based resin as the result of reaction with oxygen.

Abstract: Disclosed is a cylindrical battery cell in which a heat-shrinkable tube wraps an outer surface of a cylindrical case of the cylindrical battery cell except electrode terminals, the heat-shrinkable tube including: a base material, which is a polyester resin, capable of shrinking by heat; a supplement, which is a nylon resin, capable of increasing a tensile strength and operating temperature of the heat-shrinkable tube; and an ultraviolet stabilizer capable of inhibiting a chain reaction of free radicals generated by cleavage of polymer chains of the nylon resin or the polyester resin, when the heat-shrinkable tube is exposed to an ultraviolet ray irradiation.

Abstract: A method of manufacturing a cylindrical battery case includes performing an ironing process, which is one of the processes of manufacturing the battery case, a plurality of times in order to decrease the surface roughness of the battery case, thereby improving the corrosion characteristics of the battery case. The surface roughness of the cylindrical battery case is decreased by performing a thickness reducing process when a process for forming the outer circumferential surface of a body of the cylindrical battery case is performed at the time of manufacturing the cylindrical battery case. In addition, corrosion characteristics are improved for respective values of the surface roughness.

Abstract: The present invention relates to a cap assembly for a secondary battery mounted on an opening of a can. The cap assembly comprises: a top cap; a safety element disposed on a lower portion of the top cap; a safety vent disposed on a lower portion of the safety element; and a gasket surrounding edges of the top cap, the safety element, and the safety vent and mounted on the opening of the can, wherein an impact absorption part absorbing an impact from the gasket is disposed between an inner wall of the gasket and an outer circumferential surface of the safety vent.

Abstract: Disclosed is a cylindrical battery cell configured such that the outer surface of a cylindrical case excluding electrode terminals is wrapped by a heat-shrinkable tube, wherein the heat-shrinkable tube includes a tube substrate made of a polyester-based resin, the tube substrate being heat-shrinkable; a reinforcement agent, made of a nylon-based resin, for increasing the tensile stress and operating temperature of the heat-shrinkable tube; and an ultraviolet (UV) absorber for absorbing ultraviolet rays radiated to the heat-shrinkable tube and emitting the absorbed ultraviolet rays as thermal energy to prevent the scission of polymer chains of the nylon-based resin or the polyester-based resin as the result of reaction with oxygen.

Abstract: Disclosed is a cylindrical battery cell in which a heat-shrinkable tube wraps an outer surface of a cylindrical case of the cylindrical battery cell except electrode terminals, the heat-shrinkable tube including: a base material, which is a polyester resin, capable of shrinking by heat; a supplement, which is a nylon resin, capable of increasing a tensile strength and operating temperature of the heat-shrinkable tube; and an ultraviolet stabilizer capable of inhibiting a chain reaction of free radicals generated by cleavage of polymer chains of the nylon resin or the polyester resin, when the heat-shrinkable tube is exposed to an ultraviolet ray irradiation.

Abstract: A cylindrical battery cell is provided. The cylindrical battery cell configured to have a structure in which a wound type electrode assembly having a positive electrode/separator/negative electrode structure is mounted in a cylindrical can. The cylindrical battery cell includes an inorganic coating portion for accelerating dissipation of heat from the cylindrical can, the inorganic coating portion being provided on at least a part of the outer surface of the cylindrical can.

Abstract: The present invention relates to a cap assembly for a secondary battery mounted on an opening of a can. The cap assembly comprises: a top cap; a safety element disposed on a lower portion of the top cap; a safety vent disposed on a lower portion of the safety element; and a gasket surrounding edges of the top cap, the safety element, and the safety vent and mounted on the opening of the can, wherein an impact absorption part absorbing an impact from the gasket is disposed between an inner wall of the gasket and an outer circumferential surface of the safety vent.