Abstract: A composition for filling an ion exchange membrane, a method of preparing the ion exchange membrane, the filled ion exchange membrane, and a redox flow battery using the filled ion exchange membrane. The composition includes an ion conductive material and a water soluble support.

Abstract: A method of removing residual oxygen in a residential high temperature non-humidification fuel cell stack including at least one cathode. The method includes making the pressure in the cathode higher than that outside of the cathode and maintaining airtight sealing of the cathode of the fuel cell stack, removing the residual oxygen in the fuel cell stack, and stopping supplying of fuel to the fuel cell stack. The setting of the pressure includes blocking air flow out of the cathode, comparing the pressure in the cathode with a set pressure higher than the pressure outside the cathode, and supplying air to the cathode until the pressure in the cathode is the same as or is higher than the set pressure.

Abstract: A method of starting a polymer electrolyte membrane fuel cell (PEMFC) stack by rapidly increasing its temperature. The PEMFC stack includes: a first flow line connected to cooling plates; a second flow line connected to the cooling plates; a coolant reservoir; a heat exchanger; a by-pass line; a heating element; a first valve installed between the first flow line and the heat exchanger; and a second valve that selectively connects the coolant reservoir, the second flow line, and the by-pass line. The method of starting a PEMFC stack includes: closing the first valve and controlling the second valve so that the second flow line and the by-pass line are connected to each other, and the coolant in the coolant reservoir is not connected to the second flow line and the by-pass line; and heating the coolant in the by-pass line.

Abstract: A power conditioner includes a main converter to transform a voltage outputted from a power source into a first transformed voltage and output the first transformed voltage to supply power to a power using point; and an auxiliary converter to transform the first transformed voltage outputted from the main converter into a second transformed voltage and output the second transformed voltage to supply power to balance-of-plant (BOP) elements including driving devices of the power source. The main converter includes a first winding to transform the voltage outputted from the power source into the first transformed voltage and output the first transformed voltage to supply power to the power using point; and a second winding to transform the voltage outputted from the power source into a third transformed voltage and output the third transformed voltage to supply power directly to the BOP elements, thereby bypassing the auxiliary converter.

Abstract: Provided are redox flow batteries employing supporting electrolyte of a ring- or spiro-type structure and having high energy efficiencies and energy densities.

Abstract: A redox flow battery. A metal-ligand coordination compound including an aromatic ligand that contains an electron withdrawing group is used as the catholyte and/or the anolyte so that a redox flow battery having high energy density and excellent charge/discharge efficiency may be provided.

Abstract: A metal-ligand coordination compound containing an aliphatic ligand useful as a catholyte and/or an anolyte that enables the provision of a redox flow battery having high energy efficiency and charge/discharge efficiency.

Abstract: A redox flow battery including a positive electrode electrolyte and a negative electrode electrolyte, each of which includes a metal-ligand coordination complex, in which a metal of a metal-ligand coordination complex of the positive electrode electrolyte is different from a metal of a metal-ligand coordination complex of the negative electrode electrolyte. Due to use of different metals in the positive and negative electrode electrolytes, the redox flow battery has high energy density and high charge and discharge efficiency.

Abstract: A power conditioner includes a main converter to transform a voltage outputted from a power source into a first transformed voltage and output the first transformed voltage to supply power to a power using point; and an auxiliary converter to transform the first transformed voltage outputted from the main converter into a second transformed voltage and output the second transformed voltage to supply power to balance-of-plant (BOP) elements including driving devices of the power source. The main converter includes a first winding to transform the voltage outputted from the power source into the first transformed voltage and output the first transformed voltage to supply power to the power using point; and a second winding to transform the voltage outputted from the power source into a third transformed voltage and output the third transformed voltage to supply power directly to the BOP elements, thereby bypassing the auxiliary converter.

Abstract: A power conditioner includes a main converter to transform a voltage outputted from a power source into a first transformed voltage and output the first transformed voltage to supply power to a power using point; and an auxiliary converter to transform the first transformed voltage outputted from the main converter into a second transformed voltage and output the second transformed voltage to supply power to balance-of-plant (BOP) elements including driving devices of the power source. The main converter includes a first winding to transform the voltage outputted from the power source into the first transformed voltage and output the first transformed voltage to supply power to the power using point; and a second winding to transform the voltage outputted from the power source into a third transformed voltage and output the third transformed voltage to supply power directly to the BOP elements, thereby bypassing the auxiliary converter.

Abstract: Provided are method and apparatus for diagnosing the deterioration of a fuel cell. The method includes: controlling a frequency of current drawn from the fuel cell; calculating an AC impedance of the fuel cell by using a pulse component of output current of the fuel cell that is generated by the control of the frequency; and diagnosing the deterioration of the fuel cell based on the calculated AC impedance.

Abstract: A fuel cell system in which a low open circuit voltage (OCV) is maintained in a start-up mode and in a shut-down mode, and a method of operating the same, the method including: supplying an anode off-gas and air to the cathode in an open circuit voltage state in a start-up mode and cutting off supply of the fuel gas to the cathode in a normal operating mode; and supplying the fuel gas and air to the cathode in a shut-down mode, and if a load is cut off, purging the cathode and the anode in the OCV state.

Abstract: A method of removing residual oxygen in a residential high temperature non-humidification fuel cell stack including at least one cathode. The method includes making the pressure in the cathode higher than that outside of the cathode and maintaining airtight sealing of the cathode of the fuel cell stack, removing the residual oxygen in the fuel cell stack, and stopping supplying of fuel to the fuel cell stack. The setting of the pressure includes blocking air flow out of the cathode, comparing the pressure in the cathode with a set pressure higher than the pressure outside the cathode, and supplying air to the cathode until the pressure in the cathode is the same as or is higher than the set pressure.

Abstract: A battery pack including battery cells, a housing to house the battery cells, and a cooling device that cools air flowing through the housing. The cooling device may be installed on an intermediate portion of the housing. The cooling device may include a cooling pipe, in which water flows.

Abstract: A power conditioner for supplying controlled power generated from a power source such as a fuel cell or a solar battery to a load. The power conditioner includes a main converter converting the output voltage of the power source; an auxiliary converter converting the output voltage of the main converter to a voltage that is supplied to BOP elements; and a direct connecting line connecting the output voltage of the power source to the auxiliary converter bypassing the main converter. Accordingly, because the voltage for the power to be supplied to the BOP elements is converted only once, the power loss can be significantly reduced compared to the power loss from a conventional power conditioner.

Abstract: Disclosed is installation of an optical fiber composite electric power cable. An installation method of an optical fiber composite electric power cable includes installing an electric power cable including a conductor and an air-blown installation tube therein at an installation region; connecting tubes of adjacent electric power cables to each other, in an electric power cable connection box; and installing an optical fiber unit into the connected tubes by air pressure. Also, a cable structure used for installing the optical fiber composite electric power cable includes a conductor for electric power transmission; an insulator surrounding the conductor; an air-blown installation tube provided outside of the insulator; and a corrosion-protective layer provided to an outermost layer of the cable.

Abstract: A fuel cell system includes a first heating structure that increases an internal temperature of the stack by passing exhaust gas of the process burner through the stack; and a second heating structure that increases the internal temperature of the stack by passing heated cooling water through the stack after the cooling water is heated by heat exchange with the exhaust gas of the process burner. Accordingly, when rapid heating of a stack is necessary like during a start up operation, a time required for the fuel cell system to reach a normal operation can be greatly reduced since the stack can be simultaneously heated using high temperature exhaust gas and heated cooling water.

Abstract: Provided is a method of starting a polymer electrolyte membrane fuel cell (PEMFC) stack by rapidly increasing the temperature of the PEMFC stack. The PEMFC stack includes: a first flow line that is connected to upper parts of cooling plates installed in a plurality of unit cells of the PEMFC stack; a second flow line that is connected to lower parts of the cooling plates; a coolant reservoir installed between the first flow line and the second flow line; a heat exchanger installed between the first flow line and the coolant reservoir; a by-pass line that connects a point between the coolant reservoir and the second flow line, to the first flow line; a heating element that heats coolant in the by-pass line; a first valve installed between the first flow line and the heat exchanger; and a second valve that selectively connects the coolant reservoir, the second flow line, and the by-pass line.

Abstract: A power conditioner for supplying controlled power generated from a power source such as a fuel cell or a solar battery to a load. The power conditioner includes a main converter converting the output voltage of the power source; an auxiliary converter converting the output voltage of the main converter to a voltage that is supplied to BOP elements; and a direct connecting line connecting the output voltage of the power source to the auxiliary converter bypassing the main converter. Accordingly, because the voltage for the power to be supplied to the BOP elements is converted only once, the power loss can be significantly reduced compared to the power loss from a conventional power conditioner.

Abstract: A power conditioner includes a main converter to transform a voltage outputted from a power source into a first transformed voltage and output the first transformed voltage to supply power to a power using point; and an auxiliary converter to transform the first transformed voltage outputted from the main converter into a second transformed voltage and output the second transformed voltage to supply power to balance-of-plant (BOP) elements including driving devices of the power source. The main converter includes a first winding to transform the voltage outputted from the power source into the first transformed voltage and output the first transformed voltage to supply power to the power using point; and a second winding to transform the voltage outputted from the power source into a third transformed voltage and output the third transformed voltage to supply power directly to the BOP elements, thereby bypassing the auxiliary converter.