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 stack failure, low membrane water content, and low performance
Active Publication Date: 2019-07-02
INTELLIGENT ENERGY LTD
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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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[0077] 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.
[0078] 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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A fuel cell system (100) is disclosed herein, the fuel cell system comprising a first fuel cell stack (102), a second fuel cell stack (104) connected in series with the first fuel cell stack (102), and a second fuel cell stack (104) connected in series with the The first rectifier (106) connected in parallel to the first fuel cell stack (102). The fuel cell system (100) also includes a controller (110) configured to regulate current flow through the first fuel cell stack (102) independently of a current demand of the fuel cell system (100). air flow to provide a rehydration period for increasing the hydration level 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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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