# US 7,745,028 B2 · Fuel cell system

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 7,745,028 B2
- Document ID: US7745028B2
- Status: Granted
- Kind: B2
- Application number: 11/044,049
- Filed: 2005-01-28
- Published: 2005-07-28
- Granted: 2010-06-29
- Earliest claimed: 2004-01-28
- Assignees: Samsung SDI Co., Ltd.
- Inventors: Dong-Hun Lee; Ho-Jin Kweon; Seong-Jin An
- Web page: https://patentgrep.com/patent/US7745028B2

## CPC

- H01M 8/04089: of gaseous reactants
- H01M 8/04156: {with product water removal}
- H01M 8/04208: {Cartridges, cryogenic media or cryogenic reservoirs}
- H01M 8/0612: from carbon-containing material
- H01M 8/1011: Direct alcohol fuel cells [DAFC], e.g. direct methanol fuel cells [DMFC]
- Y02E 60/50: Fuel cells
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A fuel cell system comprising a fuel tank, a stack generating electrical energy using fuel and an oxidizer supplied thereto, and a pressure reducing unit supplying the fuel from a fuel tank to the stack while maintaining the pressure of the stack lower than the atmospheric pressure is provided.

## Claims

### Claim 1

A fuel cell system, comprising:
a fuel tank;
a stack generating electrical energy using fuel and oxidizer supplied thereto; and
a pressure reducing unit supplying the fuel from the fuel tank to the stack while maintaining the pressure of the stack lower than the atmospheric pressure.

### Claim 2 (depends on 1)

The fuel cell system of claim 1, wherein the pressure reducing unit is a vacuum pump.

### Claim 3 (depends on 1)

The fuel cell system of claim 1, further comprising:
a reformer connected to the fuel tank and the stack.

### Claim 4 (depends on 1)

The fuel cell system of claim 1, further comprising:
a pressure regulator connected to the stack and the fuel tank.

### Claim 5 (depends on 3)

The fuel cell system of claim 3, further comprising:
a pressure regulator connected to the reformer and the fuel tank.

### Claim 6 (depends on 1)

The fuel cell system of claim 1, wherein the stack comprises a polymer electrolyte membrane.

### Claim 7 (depends on 1)

The fuel cell system of claim 1, wherein a direct methanol fuel cell (DMFC) is employed.

### Claim 8 (depends on 1)

The fuel cell system of claim 1, wherein the stack is between the fuel tank and the pressure reducing unit.

### Claim 9 (depends on 1)

The fuel cell system of claim 1, wherein the pressure reducing unit sucks fuel through the stack.