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fuel cell system

A fuel cell system and fuel cell technology, applied in fuel cells, fuel cell additives, power system fuel cells, etc., can solve problems such as the reduction of fuel cell output performance

Active Publication Date: 2017-05-03
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This conventional fuel cell system implements a pulse operation that raises and lowers the pressure of the anode gas, and supplies a larger flow rate of the anode gas to the fuel cell at the time of boosting the pressure, thereby discharging impurities remaining in the fuel cell to the outside of the fuel cell, Thereby suppressing the decrease in the output performance of the fuel cell

Method used

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no. 1 approach

[0033] A fuel cell operates by sandwiching an electrolyte membrane between an anode electrode (fuel electrode) and a cathode electrode (oxidant electrode), supplying an anode gas (fuel gas) containing hydrogen to the anode electrode, and supplying oxygen-containing gas to the anode electrode. positive electrode gas (oxidant gas) to generate electricity. The electrode reactions performed at the two electrodes of the negative electrode and the positive electrode are as follows.

[0034] Negative electrode: 2H 2 →4H + +4e - …(1)

[0035] Positive electrode: 4H + +4e - +O 2 →2H 2 O...(2)

[0036] Through the electrode reactions of (1) and (2), the fuel cell generates an electromotive force of about 1 volt.

[0037] Figure 1A and Figure 1B It is a figure explaining the structure of the fuel cell 10 which concerns on 1st Embodiment of this invention. Figure 1A It is a schematic perspective view of the fuel cell 10 . Figure 1B yes Figure 1A The IB-IB sectional vie...

no. 2 approach

[0159] Next, a second embodiment of the present invention will be described. The second embodiment of the present invention differs from the first embodiment in that the anode pressure is maintained for a fixed time. Next, this difference will be described. In addition, in each embodiment shown below, the same code|symbol is used for the part which realizes the same function as the said 1st Embodiment, and the overlapping description is abbreviate|omitted suitably.

[0160] In this embodiment, the pressure (cathode pressure) detected by the pressure sensor 34 provided in the anode gas supply passage 32 is used instead as the anode including the anode gas flow paths 121 and the buffer tank 36 inside the fuel cell stack 2. pressure on the system as a whole.

[0161] Therefore, when the pressure of each anode gas flow channel 121 inside the fuel cell stack becomes the pressure detected by the pressure sensor 34, there may be a delay, although the time is short. Therefore, in t...

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Abstract

A fuel cell system comprising: a target pressure setting unit which periodically and repeatedly sets a target upper limit pressure and a target lower limit pressure as target pressures of an anode gas; and an upper limit pressure setting unit which sets And the smaller one of the set upper limit value of the anode gas and the upper limit value of the anode gas set based on the output performance of the fuel cell is set as the upper limit pressure of the anode gas. When the upper limit value of the anode gas set for the durability performance of the anode gas is used as the upper limit pressure of the anode gas, the target pressure setting part sets a value smaller than the upper limit value as the target upper limit pressure. When the upper limit of the anode gas is set as the upper limit pressure of the anode gas, the target pressure setting unit sets a pressure higher than the upper limit as the target upper limit pressure.

Description

technical field [0001] The invention relates to a fuel cell system. Background technique [0002] Japanese JP2005-243476A discloses, as a conventional fuel cell system, an anode gas non-circulation type fuel cell system that does not return unused anode gas discharged to the anode gas discharge passage to the anode gas supply passage. This conventional fuel cell system implements a pulse operation that raises and lowers the pressure of the anode gas, and supplies a larger flow rate of the anode gas to the fuel cell at the time of boosting the pressure, thereby discharging impurities remaining in the fuel cell to the outside of the fuel cell, A decrease in the output performance of the fuel cell is thereby suppressed. Contents of the invention [0003] The problem to be solved by the invention [0004] Currently, the inventors are studying repeatedly setting high pressure and low pressure as the target pressure, and implementing feedback control of the pressure of the an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/04H01M8/06H01M8/10H01M8/0438H01M8/04746
CPCH01M8/04089H01M8/04104H01M8/04388H01M8/04753H01M8/04783H01M2008/1095H01M8/04992H01M2250/20Y02E60/50Y02T90/40H01M8/1039
Inventor 小幡武昭浅井祥朋筑后隼人
Owner NISSAN MOTOR CO LTD