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Breathable bipolar plate suitable for fuel cell stack and fuel cell stack

A fuel cell stack and bipolar plate technology, applied in fuel cells, electrical components, circuits, etc., can solve the problems of low oxygen partial pressure in the membrane electrode area, affecting battery performance, and gas cannot diffuse, etc., to increase the contact area and reduce Effect of contact resistance and improvement of power generation efficiency

Inactive Publication Date: 2020-07-31
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to ensure the performance of the battery, the contact surface between the ridge of the plate flow channel and the carbon paper must ensure a certain contact area and contact pressure, otherwise the gas in the flow channel groove will not be able to diffuse to the part where the ridge of the flow channel is pressed on the membrane electrode. It will make the current density distribution of the fuel cell uneven, thus affecting the performance of the battery
For the current fuel cell stack, due to the existing bipolar plate flow channel structure, the oxygen partial pressure in the membrane electrode area is low, and the gas diffusion is uneven, which affects the battery performance.

Method used

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  • Breathable bipolar plate suitable for fuel cell stack and fuel cell stack
  • Breathable bipolar plate suitable for fuel cell stack and fuel cell stack
  • Breathable bipolar plate suitable for fuel cell stack and fuel cell stack

Examples

Experimental program
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Effect test

Embodiment 1

[0034] like figure 1 As shown, a gas-permeable bipolar plate suitable for a fuel cell stack provided by the present invention includes: an anode manifold port 2, a cathode manifold port 3, a water manifold port 4, an anode branch port 5, and a cathode branch port 6 , Moisture nozzle 7, diversion area 8, flow field area 9, sealing area 10.

[0035] like figure 2 As shown, the gas-permeable bipolar plate of the present invention is mainly divided into three parts, namely an anode plate 11 , a cathode plate 12 , and an air-water separation plate 13 . The anode plate of the present invention is the same as the existing conventional anode plate, and contains a structure comprising an anode manifold port 2, a cathode manifold port 3, a water manifold port 4, an anode branch port 5, a cathode branch port 6, a water pipe port 7, Dividing area 8, flow field area 9, sealing area 10. The processing method of the anode plate is stamping. The structure of the cathode plate 12 of the p...

example 1

[0040] like Figure 4 As shown, on the basis of Embodiment 1, the shape of the opening can be transformed into polygonal shapes such as triangles and quadrilaterals. The present invention does not limit the shape of the openings, and the shape and size of the openings are beneficial to enable the cathode gas to diffuse to the membrane electrode to participate in the reaction.

[0041] Variation 2

[0042] like Figure 5As shown, on the basis of Embodiment 1, the shape of the opening can be transformed into a waist circle or other various irregular shapes. The present invention does not limit the shape of the openings, and the shape and size of the openings are beneficial to enable the cathode gas to diffuse to the membrane electrode to participate in the reaction.

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PUM

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Abstract

The invention provides a breathable bipolar plate suitable for a fuel cell stack and the fuel cell stack. The breathable bipolar plate comprises an anode plate, a cathode plate and a gas-water barrierplate; the gas-water barrier plate is arranged between the anode plate and the cathode plate; and a plurality of ridges protruding outwards are arranged on one side of the cathode plate, a pluralityof openings are formed in the ridges, a flow channel is formed between every two adjacent ridges, and the position, corresponding to the ridges, of the other side of the cathode plate is sunken inwards to form a space below the ridges. The gas-water barrier plate is positioned on the side where the under-ridge space of the cathode plate is positioned, and is used for preventing cathode reaction gas on the cathode plate from entering the space between the anode plate and the gas-water barrier plate. The air-permeable bipolar plate provided by the invention can effectively improve the oxygen concentration at the runner ridge part corresponding to the membrane electrode cathode, so that compared with the traditional bipolar plate, the bipolar plate of the invention is advantageous in that themass transfer of cathode gas is enhanced, the average current density of a fuel cell is improved, and the power generation performance of the fuel cell is improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a gas-permeable bipolar plate and a fuel cell stack, and in particular to a gas-permeable bipolar plate and a fuel cell stack suitable for a fuel cell stack. Background technique [0002] A fuel cell is a power generating device that can directly convert the chemical energy of fuel and oxidant into electrical energy. Since the voltage of a hydrogen fuel cell single cell is very low, in order to meet certain power and voltage requirements, it is often necessary to connect multiple cells in series to form a fuel cell stack in practical applications. The fuel cell stack structure includes end plates, collector plates, bipolar plates, membrane electrodes, seals, etc. The performance of each single cell will affect the overall performance of the entire stack. [0003] Patent document CN107946605A discloses a bipolar plate flow channel manufacturing process and a bipolar plate flow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0258H01M8/0267
CPCH01M8/0258H01M8/0267Y02E60/50
Inventor 章俊良吴爱明魏光华郑志峰
Owner SHANGHAI JIAO TONG UNIV