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A fuel cell system

A technology of fuel cell system and fuel cell stack, which is applied in the direction of fuel cells, circuits, electrical components, etc., and can solve problems such as air flow demand contradiction, water purification loss from fuel cell stack, stack failure, etc.

Active Publication Date: 2016-01-20
INTELLIGENT ENERGY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dual purpose of air flow (i.e. for oxygen delivery and also for air cooling) may cause conflicting air flow requirements
For cooling, a very high stoichiometric air flow across the cathode electrode is required, possibly resulting in a lower water content of the membrane (resulting in lower performance), depending of course on ambient conditions and stack temperature, or in extreme cases resulting in continuous depletion of clean water from the fuel cell stack over time, which eventually leads to stack failure

Method used

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  • A fuel cell system
  • A fuel cell system
  • A fuel cell system

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Embodiment Construction

[0076] Examples disclosed herein relate to a fuel cell system including a controller for regulating air flow through a first fuel cell stack in series with a second fuel cell stack to provide A rehydration period for the fuel cell stack hydration level. The system also includes a rectifier in parallel with the first fuel cell stack to automatically bypass the first fuel cell stack when air flow to the first fuel cell stack is sufficiently reduced thereby avoiding the need to externally load the first fuel cell stack disengaged and enabled to maintain power output from the fuel cell system.

[0077] The air flow to the fuel cell stack can be periodically adjusted to temporarily upset the balance between the water content of the membrane and the water removal rate (as determined by the existing operating conditions of the fuel cell stack) to achieve higher Heap efficiency and system efficiency. The procedure involves generating excess water at the fuel cell cathode for a short...

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Abstract

A fuel cell system (100) comprises a first fuel cell stack (102), a second fuel cell stack (104) in series with the first fuel cell stack (102), and a first rectifier (106) in parallel with the first fuel cell stack (102). The fuel cell system (100) also comprises a controller (110) configured to modulate air flow through the first fuel cell stack (102) independent of current demand on the fuel cell system (100) to provide rehydration intervals that increase the hydration levels of the first fuel cell stack (102).

Description

technical field [0001] The present disclosure relates to fuel cell systems, and in particular, to a proton exchange membrane type fuel cell in which hydrogen is supplied to the anode side of the fuel cell, oxygen is supplied to the cathode side of the fuel cell, and water byproduct is produced on the cathode side of the fuel cell and Water by-products are removed therefrom. Background technique [0002] Such fuel cells include a proton exchange membrane (PEM) sandwiched between two porous electrodes that together form a membrane electrode assembly (MEA). The MEA itself is typically sandwiched between two structures: (i) a cathode diffusion structure (such as a cathode gas diffusion layer), which has a first face adjacent to the cathode face of the MEA; and (ii) an anode diffusion structure (such as an anode gas diffusion layer). gas diffusion layer) having a first face adjacent to the anode face of the MEA. The second side of the anode diffusion structure is in contact wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/04828H01M8/04119H01M8/04492
CPCH01M8/0485H01M2008/1095H01M8/04507H01M8/04126Y02E60/50H01M8/04828H01M8/04955H01M8/0432H01M8/04559H01M8/04589H01M8/04992H01M8/249
Inventor 詹森·罗伯茨哈里·约翰·卡尔曼森凯文·M·库普乔杰里米·大卫·鲍曼
Owner INTELLIGENT ENERGY LTD