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Structure for improving weak piece of end plate of fuel cell stack

A fuel cell stack and end plate technology, applied in fuel cells, circuits, electrical components, etc., can solve the problems of increasing the complexity of the stack structure, and achieve the effects of improving the end plate effect, increasing the output voltage, and increasing the output voltage

Pending Publication Date: 2021-05-07
SHANGHAI SHENLI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 3. It is necessary to add other structures between the dummy battery and the end plate to improve the end plate effect, which increases the complexity of the stack structure

Method used

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  • Structure for improving weak piece of end plate of fuel cell stack
  • Structure for improving weak piece of end plate of fuel cell stack
  • Structure for improving weak piece of end plate of fuel cell stack

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A structure for improving the weak piece of a fuel cell stack end plate, including a power generation cell, a dummy cell, an end plate, an insulating plate and a current collecting plate. The specific structure is as figure 1 As shown, a dummy battery 104 and a dummy battery 106 without power generation function are provided at both ends of the power generation battery 105, and a current collector plate 103, an insulating plate 102, and an end plate 101 are arranged on the outside of the dummy battery 104 in sequence, and the outside of the dummy battery 106 is sequentially arranged A collector plate 107, an insulating plate 108, and an end plate 109 are provided to assemble a fuel cell stack. The fuel cell stack is provided with three inlets and three outlets: air inlet 110, air outlet 115, hydrogen inlet 113, hydrogen outlet 112, cooling liquid Inlet 111, coolant outlet 114.

[0033] Such as figure 2 As shown, the power generation cell includes a cathode plate b201...

Embodiment 2

[0039] The width of the conduction cooling fluid channel of the power generation battery is L1, the depth is H1, and the width of the flow channel ridge is R1. The width is L2, the depth is H2, and the width of the runner ridge is R2, where L2=1.1L1, H2=1.1H1, R2=0.7R1.

Embodiment 3

[0041] The width of the conduction cooling fluid channel of the power generation battery is L1, the depth is H1, and the width of the flow channel ridge is R1. The width is L2, the depth is H2, and the width of the runner ridge is R2, where L2=1.3L1, H2=1.3H1, R2=0.9R1.

[0042] Figure 5 When starting at a low temperature of -20°C, the monolithic voltage of the stack without pseudo-batteries, Figure 6 When starting at a low temperature of -20°C, the monolithic voltage of the dummy battery stack is set at the end plate, compared with Figure 5 and Figure 6 It can be seen that the voltage of the single cell on the end plate with the dummy battery stack at the end plate is significantly higher than the voltage of the single cell on the end plate without the dummy battery stack.

[0043] Table 1 shows the performance attenuation of the stack without dummy battery and the stack with dummy battery at the end plate after 2000 hours of operation. The performance attenuation of t...

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Abstract

The invention relates to a structure for improving a weak piece of an end plate of a fuel cell stack. The structure comprises a power generation cell, pseudo cells, an end plate, an insulating plate and a collector plate, the width of a polar plate flow channel of the power generation cell is L1, the depth of the polar plate flow channel is H1, the width of a flow channel ridge is R1, the width of a polar plate flow channel of the pseudo cell is L2, the depth of the polar plate flow channel of the pseudo cell is H2, the width of the flow channel ridge is R2, L2 = (1.1-1.3) L1, H2 = (1.1-1.3) H1, and R2 = (0.7-0.9) R1. The pseudo cells without the power generation function are arranged at the two ends of the fuel cell stack and serve as transmission channels of reaction gas and cooling water, so that redundant liquid water generated in the running process of the stack is discharged, and meanwhile, the phenomenon that the voltage of single cells at the two ends of the stack end plate is relatively low is improved; and the output performance, the cold start performance and the durability of the stack are improved.

Description

technical field [0001] The invention relates to a fuel cell, in particular to a structure for improving the weak piece of the fuel cell stack end plate. Background technique [0002] A fuel cell is a device that can directly convert the chemical energy of fuel into electrical energy through an electrochemical reaction. Its energy conversion efficiency is not limited by the theoretical efficiency of the Carnot heat engine cycle, and the conversion efficiency is relatively high (45-60%). The only thing is water, and there is no pollution to the environment, so it has broad development prospects in many fields. Among them, the proton exchange membrane fuel cell has the characteristics of high power density, fast start-up, and fast response to load changes, and has become an important development direction in the field of transportation energy. However, in practical applications, fuel cells still face many problems, one of which is the end-plate effect. The so-called end-plate ...

Claims

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Application Information

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IPC IPC(8): H01M8/2465H01M8/0258H01M8/0213H01M8/04119H01M8/04223H01M8/04302H01M8/0432
CPCH01M8/0213H01M8/0258H01M8/04156H01M8/04268H01M8/04365H01M8/2465H01M8/04302Y02E60/50
Inventor 曾庆喜陈广明甘全全戴威
Owner SHANGHAI SHENLI TECH CO LTD
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