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Fuel cell with a separator plate unit, and a separator plate unit

A fuel cell and separator technology, applied in fuel cells, fuel cell additives, fuel cell components, etc., can solve problems such as high humidity of oxidant, insufficient absorption and export, and influence on fuel cell reaction

Inactive Publication Date: 2009-06-24
DAIMLER AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this wetting allows the MEA to be sufficiently wetted in the oxidizer inlet region to avoid drying out of the PEM, the oxidizer absorbs only so little product water from the start that the oxidizer humidity quickly becomes too high for adequate absorption and export product water
This can easily adversely affect fuel cell reactions

Method used

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  • Fuel cell with a separator plate unit, and a separator plate unit
  • Fuel cell with a separator plate unit, and a separator plate unit
  • Fuel cell with a separator plate unit, and a separator plate unit

Examples

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Embodiment Construction

[0037] In the figures, functionally identical elements are provided with the same reference numerals.

[0038] figure 1 A cross-sectional view of an individual fuel cell 10 is schematically shown. In conventional battery packs, for example in motor vehicles, a plurality of such fuel cells 10 are stacked on top of each other in a direction normal to the plane of the fuel cells to form a battery pack for powering the traction system or the electrical system.

[0039] The fuel cell 10 has a membrane electrode assembly 16 , in which an ion-conducting polymer membrane 18 adjoins a gas diffusion electrode 20 , 22 on both sides. On the cathode side, the membrane electrode assembly 16 is adjacent to a cathode chamber as the first fluid chamber 12 , wherein the oxidant is used as the first fluid, and the first fluid flows into the fluid chamber 12 through the inlet 24 and flows out again through the outlet 26 . Adjacent to the anode side, an anode cavity is formed as a second fluid c...

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PUM

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Abstract

The invention relates to a fuel cell having a membrane electrode arrangement (16) arranged between two separator plate units (44), a first fluid area (12) for distribution of a first fluid which is adjacent to one side of the membrane-electrode arrangement (16), a second fluid area (14) for distribution of a second fluid which is adjacent to a side of the membrane-electrode arrangement (16) opposite this side, with a separating wall (36) being arranged in at least one fluid area (12) and subdividing the fluid area (12) into at least one metering area (32) and one fluid subarea (34), with the at least one metering area (32) having a fluid connection to the adjacent fluid subarea (34) at at least one metering point (38), such that the first fluid can be metered from the metering area (32) through the metering point (38) into the adjacent fluid subarea (34). According to the invention, starting from an input point (24), at the edge, for the first fluid into the fluid area (12), a cross section of the fluid subarea (34) increases in the flow direction (40) of the first fluid towards an output port (26).

Description

technical field [0001] The invention relates to a fuel cell with a separator unit and a separator unit according to the preambles of the independent claims. Background technique [0002] The basic structure of a polymer electrolyte membrane fuel cell (PEM fuel cell) is known. A PEM fuel cell includes a membrane electrode assembly / membrane electrode assembly (MEA) consisting of an anode, a cathode, and a polymer electrolyte membrane (PEM) disposed between the anode and cathode. The MEA itself is arranged between two separator units, wherein the separator unit arranged on the anode has channels for distributing fuel (such as hydrogen, hydrogen-rich reformed gas, etc.), and the separator unit arranged on the cathode There are channels for distributing oxidant (eg air), where these channels face the MEA. Such channels are also referred to below as distribution channels. The distribution channels form so-called anode or cathode chambers. The electrodes (anode and cathode) are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M8/04H01M50/77
CPCH01M8/1002H01M8/0256H01M8/0245H01M8/0232H01M8/04104H01M8/04126H01M8/0265Y02E60/521H01M8/1007Y02E60/50
Inventor F·布兰克
Owner DAIMLER AG