Samsung Sdi Co., Inc.

Dong-Yun Lee

Ju-Yong Kim

Chan-Ho Lee

Sung-Chul Lee

Dong-Myung Suh

Jin-Hong An

Sang-Jun Kong

Dong-Uk Lee

Won-Hyouk Jang

Yun-suk Choi

Myeong-Ju Ha

Ri-a Ju

Sang-Hyeon Choi

A fuel cell system comprising a stack including at least one electricity generator for generating electric energy through a reaction between fuel and oxygen, a fuel supply unit for supplying the fuel to the electricity generator, and an oxygen supply unit for supplying the oxygen to the electricity generator is provided. The electricity generator includes a membrane-electrode assembly and separators which have a plurality of flow channels for passing fuel and oxygen and which are placed on both surfaces of the membrane-electrode assembly. The separators include a connecting portion with a straight part between rounded corners for coupling the flow channels at their ends. The connecting portion minimizes turbulence in the flow while maintaining sufficient effective area for contact between the fuel and oxygen with the active area of the membrane-electrode assembly.

Stack and fuel cell system having the same

A method of controlling a flow rate of fuel in a fuel supply unit of a fuel cell system is provided. The fuel cell system includes a fuel pump, a revolution per minute (RPM) measuring unit, a microcomputer, and a power converter. The method of controlling the flow rate controls the fuel supply unit so as to supply the fuel to a reformer reforming the fuel to generate hydrogen or a stack generating electric energy through a reaction of the fuel and oxygen. The method of controlling the flow rate includes measuring an actual RPM of the fuel pump; comparing the actual RPM to a reference RPM of the fuel pump; and adjusting a driving voltage of the fuel pump on the basis of the comparison result.

Method of correcting flow rate in fuel supply unit of fuel cell system

A fuel cell reformer includes a main body having a first pipe with a second pipe inside the first pipe, a thermal source unit in the second pipe, a reforming reaction unit in a first region between the first pipe and the second pipe to generate a reforming gas containing hydrogen through a reforming reaction of a fuel, and a carbon monoxide reduction unit in a region other than the first region between the first pipe and the second pipe to reduce a concentration of carbon monoxide contained in the reforming gas. A thermal treatment unit in the main body supplies thermal energy to the reforming reaction unit and the carbon monoxide reduction unit at a time of initial driving of the reformer such that the supplied thermal energy corresponds to a unique operational temperature range in the reforming reaction unit, and to a unique operational temperature range in the carbon monoxide reduction unit.

Fuel cell reformer

An adaptable fuel cell system includes a stack generating electric energy through an electrochemical reaction between hydrogen and oxygen and applying the electric energy to a load. A reformer reforms a fuel to generate the hydrogen supplied to the stack. A fuel supply unit supplies the fuel to the reformer. An oxygen supply unit supplies the oxygen to the stack. A first buffer unit electrically coupled to the load applies an auxiliary power to the load based on usage electric energy of the load. A second buffer unit coupled to the reformer and the stack adjusts the hydrogen supplied from the reformer to the stack based on the usage electric energy of the load. In one embodiment, a centralized control unit detects a reference electric energy of the stack and the usage electric energy of the load and controls the buffer units based on the usage electric energy.

Fuel cell system configured to detect and control excess load use

Growing community of inventors

Suwon-si, South Korea

Dong-Yun Lee