Fuel cell air flow guide polar plate suitable for operating under normal pressure or low pressure

An air diversion, fuel cell technology, applied in the direction of fuel cells, fuel cell components, battery electrodes, etc., can solve the problems of negative values, reduced safety, low battery voltage, etc., and achieves small water flow resistance and uniform temperature. , the effect of small temperature difference

Active Publication Date: 2009-02-25
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] In addition, in order to prevent the water generated by the fuel cell from clogging the diversion groove, it is often used to increase the metering ratio of air and hydrogen in the operation of the fuel cell, that is, to increase the flow rate of air and hydrogen, and use excess air and hydrogen to take the product water out of the fuel cell. This operation method actually increases the operating pressure of the fuel cell, increases the operating cost, reduces the safety, and is contrary to the design of the fuel cell to be suitable for normal pressure or low pressure operation (especially when used as a vehicle or ship engine) At the same time, the efficiency of the fuel cell system is greatly reduced, because the excess air is wasted or the excess hydrogen is circulated, which will inevitably increase the mechanical power consumption of conveying air or circulating hydrogen, thereby reducing the efficiency of the fuel cell system
[0016] Thirdly, when the air flow groove or the hydrogen flow groove of the fuel cell deflector plate is blocked during operation, some blockages will appear. The battery voltage is very low or even negative, resulting in unstable operation of the fuel cell, and in severe cases, the electrodes will be broken down. , and destroy the entire stack

Method used

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  • Fuel cell air flow guide polar plate suitable for operating under normal pressure or low pressure
  • Fuel cell air flow guide polar plate suitable for operating under normal pressure or low pressure
  • Fuel cell air flow guide polar plate suitable for operating under normal pressure or low pressure

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Such as figure 2 , Figure 4 As shown, a fuel cell air guide plate suitable for normal pressure air operation used in a 1-100KW fuel cell has a size of 200×200×1.5mm, and the air guide plate is the air guide plate 1 and The cooling water plate 2 is a square flow-guiding bipolar plate that is combined in opposite directions. The flow-guiding bipolar plate includes air inlet main holes 3, air outlet main holes 4, hydrogen air inlet main holes 5, hydrogen outlet main holes 6, cooling Water inlet mainstream hole 7, cooling water outlet mainstream hole 8, each fluid inlet and outlet mainstream holes are arranged diagonally, and many air flow grooves 9 are arranged between the air inlet and outlet mainstream holes of the air guide plate. The groove depth of the air flow groove × groove width = 0.8 × 0.8mm, the number of grooves is 30, and many cooling water flow grooves 10 are arranged between the cooling water inlet and outlet main holes of the cooling water plate. Groove...

Embodiment 2

[0046] Such as image 3 , Figure 4 As shown, a fuel cell air guide plate suitable for normal pressure air operation used in a 1-100KW fuel cell has a size of 200×200×1.5mm, and the air guide plate is the air guide plate 1 and The cooling water plate 2 is a square flow-guiding bipolar plate that is combined in opposite directions. The flow-guiding bipolar plate includes air inlet main holes 3, air outlet main holes 4, hydrogen air inlet main holes 5, hydrogen outlet main holes 6, cooling Water inlet mainstream hole 7, cooling water outlet mainstream hole 8, each fluid inlet and outlet mainstream holes are arranged diagonally, and many air flow grooves 9 are arranged between the air inlet and outlet mainstream holes of the air guide plate. The groove depth of the air flow groove × groove width = 0.8 × 0.8mm, the number of grooves is 30, and many cooling water flow grooves 10 are arranged between the cooling water inlet and outlet main holes of the cooling water plate. Groove ...

Embodiment 3

[0049] What is used in the fuel cell stack in Example 1 is a fuel cell air deflector plate suitable for normal pressure air operation, with a size of 200×200×1.5mm. This embodiment 3 is a kind of fuel cell air guide plate suitable for low-pressure air operation. The fuel cell air guide plate has a size of 200×200×1.5mm, and other designs are the same as in Example 1, the difference is: the groove depth of the air flow groove×the groove width=0.3×0.8mm, the root of the groove The number is 25, and the flow resistance that air enters into from the guide plate inlet is larger than that in Embodiment 1, so the air operating pressure is about 0.5 atmospheric pressure (relative pressure).

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Abstract

The invention discloses a fuel battery air diversion plate in the normal pressure or lower pressure condition, which is characterized by the following: the air diversion plate is square diversion bipolar board of integral bifarious combination of air diversion board and cooling water board, which contains air inlet main stream hole, air outlet main stream hole, hydrogen inlet main stream hole, hydrogen outlet main stream hole, cooling water inlet main stream hole, cooling water outlet main stream hole with diagonal distribution for each inlet and outlet hole, wherein several air diversion grooves are set between air diversion inlet and outlet main stream grooves; several cooling water diversion grooves are set between cooling water board inlet and outlet main stream holes. The invention is not easy to block diversion groove, which operates stably.

Description

technical field [0001] The invention relates to a fuel cell, in particular to a fuel cell air guide plate suitable for normal pressure or low pressure operation. Background technique [0002] An electrochemical fuel cell is a device that converts hydrogen fuel and oxidant into electrical energy and reaction products. The internal core component of the device is the membrane electrode (Membrane Electrode Assembly, referred to as MEA). The membrane electrode (MEA) is composed of a proton exchange membrane and two porous conductive materials, such as carbon paper, sandwiched between the two sides of the membrane. On the two boundary surfaces of the membrane and the carbon paper, there are even and finely dispersed catalysts for initiating electrochemical reactions, such as metal platinum catalysts. Conductive objects can be used on both sides of the membrane electrode to draw the electrons generated during the electrochemical reaction through an external circuit to form a curr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M8/02H01M8/0258H01M8/0267
CPCY02E60/50
Inventor 夏建伟胡里清李拯
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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