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Low cost fuel cell bipolar plate and method of manufacturing the same

A fuel cell and bipolar plate technology, applied in the direction of fuel cell manufacturing, fuel cells, fuel cell components, etc., can solve problems such as non-corrosion resistance, polluted fuel cell membranes, performance degradation of bipolar plates, etc., to achieve Good corrosion resistance, good water management properties, low contact resistance effect

Active Publication Date: 2015-12-02
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most low-cost metal sheets do not have the corrosion resistance required in fuel cells, mainly because of the release of corrosive fluoride ions from fuel cell membranes
Metal corrosion not only degrades the performance of the bipolar plate itself, but also produces soluble metal ions that contaminate the fuel cell membrane and impair its proton conductivity

Method used

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  • Low cost fuel cell bipolar plate and method of manufacturing the same
  • Low cost fuel cell bipolar plate and method of manufacturing the same
  • Low cost fuel cell bipolar plate and method of manufacturing the same

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Embodiment Construction

[0017] The following description of the various embodiments is merely exemplary in nature and in no way intended to limit the invention and its application or uses.

[0018] One embodiment of the invention includes a fuel cell bipolar plate comprising a conductive metal or metal alloy plate having at least one corrosion resistant layer and / or one conductive layer deposited by atomic layer deposition. Any inexpensive and chemically stable metallic material can be used as the metal plate. Suitable metallic materials include, but are not limited to, aluminum, aluminum alloys, steel, stainless steel, titanium and titanium alloys. Aluminum and aluminum alloys can be used to obtain high energy density due to their low specific gravity and low cost.

[0019] The metal material may be formed into a thin sheet and stamped to form at least one channel for the passage of the fluid. Any stamping process may be used to form a suitable pattern of fluid flow channels. In one embodiment, a...

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Abstract

Fuel cell bipolar plates are made by depositing a pinhole free corrosion resistant and / or a conductive layer on a metal plate using an atomic layer deposition method. In one embodiment, a conductive layer is deposited on an anodized metal plate using atomic layer deposition method. In another embodiment, at least one corrosion resistant metal oxide layer and at least one conductive layer are deposited on a metal plate individually using atomic layer deposition method. In yet another embodiment, a corrosion resistant and conductive metal oxynitride layer is deposited on a metal plate using an atomic layer deposition method.

Description

technical field [0001] The technical field to which the present invention generally relates includes fuel cell bipolar plates and methods of manufacturing the same. Background technique [0002] A fuel cell typically consists of a series of membrane electrode assemblies and bipolar plates stacked together in an alternating fashion. Membrane electrode assemblies are typically made from an ion-conducting membrane sandwiched between an anode and a cathode on opposite sides of the membrane. A bipolar plate is a plate that resembles an electrical conductor with channels that serve as passages for fluids. At least two different reactant gases flow through the channels of the bipolar plates to respective anode and cathode sections where the gases react electrochemically to generate electricity. The electricity generated by the electrochemical reaction is collected and conducted through the bipolar plates to an external circuit. Therefore, bipolar plates need to have high electri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/86
CPCH01M8/0228H01M8/0206Y02E60/50Y02P70/56Y02P70/50H01M8/0232
Inventor G·V·达赫奇T·A·特拉博德M·H·阿布德 埃尔哈米德
Owner GM GLOBAL TECH OPERATIONS LLC
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