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Fuel cell stack with counterflow cooling and a plurality of coolant evacuation channels parallel to the stack axis

A fuel cell stack and cooling channel technology, applied in fuel cell additives, fuel cell components, fuel cells, etc., can solve problems such as destruction efficiency, and achieve the effect of small fluid resistance and uniform temperature distribution

Inactive Publication Date: 2007-10-31
H TEC SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] An additional problem can arise, especially for low and medium power fuel cell stacks, if relatively high pressures are generated due to poor channel cross-sections and channel lengths to deliver the coolant through the channel system
For this, the power required by the auxiliary equipment will regularly destroy the efficiency

Method used

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  • Fuel cell stack with counterflow cooling and a plurality of coolant evacuation channels parallel to the stack axis
  • Fuel cell stack with counterflow cooling and a plurality of coolant evacuation channels parallel to the stack axis
  • Fuel cell stack with counterflow cooling and a plurality of coolant evacuation channels parallel to the stack axis

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Embodiment Construction

[0023] The fuel cell stack 1 shown schematically in FIG. 1 is formed in a known manner from a plurality of fuel cells 2 , here six fuel cells 2 , which are arranged one above the other and sandwiched between end plates 3 . . Each fuel cell 2 is composed of a membrane electrode unit consisting of a membrane 4 in the form of a polymer electrolyte membrane, an anode 5 arranged next to the membrane 4 , and a cathode 6 arranged next to the other side of the membrane 4 . A bipolar plate 7 is arranged between adjacent membrane electrode units 4 , 5 , 6 , serves to conduct electricity and consists essentially of carbon.

[0024] Each bipolar plate 7 is provided with one side of the cathode 6 and a transverse channel 8 open to both ends. They are arranged parallel to each other and perpendicular to the axis 9 of the cell stack, and are arranged with the longitudinal channel 8 in the bipolar plate 7. 10, the longitudinal channel 10 is open to the anode 5. Longitudinal channels 10 are ...

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Abstract

Disclosed is a fuel cell stack comprising several superimposed polymer electrolyte membrane fuel cells (2). A bipolar plate (7) that is provided with longitudinal ducts (10) supplying hydrogen and transverse ducts which supply oxygen and are used for cooling is arranged between adjacent membrane-electrode units (4, 5, 6). A current flowing in opposite directions through adjacent ducts of the same fuel cell (2) can be created within the air ducts (8) via collecting ducts (11) that are provided at the outflow end for every other cooling duct if the flow is fed to the stack from both sides, resulting in a very homogeneous temperature distribution within the cell (2) or stack (1).

Description

technical field [0001] The invention relates to a fuel cell stack. Background technique [0002] This fuel cell stack is composed of fuel cells in polymer electrolyte membrane configuration, which includes a plurality of fuel cells for constructing the stack. The basic structure of such a battery is known, and DE19544323A1 and DE19938589A1 can be found for relevant content. [0003] A cell stack (group) composed of such fuel cells belongs to the known technology. Proton Motor GmbH offers a liquid-cooled fuel cell stack with a power of 5 kW under the type designation HZ40. On the one hand, this kind of battery stack realizes the input of fuel, and on the other hand, realizes the input of oxygen through the central connecting pipe in the form of air input, and distributes it in the battery stack by the channel system. In order to dissipate the heat generated during operation, a liquid cooling device is provided, which likewise operates via a central connecting pipe and a ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/24H01M8/02H01M8/04H01M8/10
CPCH01M8/04074H01M8/0267H01M8/2465H01M8/04029H01M8/242Y02E60/50H01M8/026H01M8/0263H01M8/2457H01M8/0258H01M8/2484
Inventor 斯特凡·赫勒乌韦·屈特
Owner H TEC SYST