Abstract: Described is a cylindrical secondary battery in which an inner surface of a can is coated to insulate an electrode assembly and a can from each other and to improve heat resistance of the can. The cylindrical secondary battery may include an electrode assembly, a can in which the electrode assembly is accommodated and of which one end is opened so as to be electrically connected to the electrode assembly, a cap plate electrically connected to the electrode assembly, and a rivet terminal insulated from the can and the cap plate, which may be configured to seal one end of the can and which may be insulated from the can. A first coating layer may be provided on at least a portion of an inner surface of the can.

Abstract: An apparatus for generating injection current for a fuel cell stack includes a switch configured to retain any one state of an on state and an off state; an inductor configured to output accumulated energy according to a state of the switch; and a converter configured to provide an output of the inductor to a load or convert the output into a predetermined voltage and provide the predetermined voltage to a load.

Abstract: An apparatus for generating injection current for a fuel cell stack includes a first converter configured to convert direct current of a voltage corresponding to a high voltage battery, into direct current of a predetermined voltage; a second converter configured to convert the converted direct current into alternating current; a filter configured to filter a signal of a predetermined frequency band from the converted alternating current; and a control unit configured to perform a feedback control to allow the filtered alternating current to be injected without being distorted when injecting the filtered alternating current into the fuel cell stack.

Abstract: A soldering jig for double-faced cooling power modules is provided. The soldering jig prevents thermal deformation of a substrate during a soldering process. The soldering jig is used to fix the position of an upper substrate and a lower substrate when a semiconductor chip is disposed and soldered between the upper and lower substrates. The soldering jig includes a lower jig plate that is disposed under the lower substrate and fixes the position of lower substrate, an upper jig plate that is disposed over the upper substrate and compresses the upper substrate toward the lower substrate. Additionally, a connector which couples the lower jig plate and the upper jig plate, and an insert is installed on the connector and is disposed between the upper substrate and the lower substrate to maintain a constant distance between the upper substrate and the lower substrate during a soldering process.

Abstract: An apparatus for generating injection current for a fuel cell stack includes a first converter configured to convert direct current of a voltage corresponding to a high voltage battery, into direct current of a predetermined voltage; a second converter configured to convert the converted direct current into alternating current; a filter configured to filter a signal of a predetermined frequency band from the converted alternating current; and a control unit configured to perform a feedback control to allow the filtered alternating current to be injected without being distorted when injecting the filtered alternating current into the fuel cell stack.

Abstract: An apparatus for generating injection current for a fuel cell stack includes a switch configured to retain any one state of an on state and an off state; an inductor configured to output accumulated energy according to a state of the switch; and a converter configured to provide an output of the inductor to a load or convert the output into a predetermined voltage and provide the predetermined voltage to a load.