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Flow channel structure for internal water management of fuel cell and polar plate and cell with flow channel structure

A fuel cell and internal water technology, which is applied to fuel cell components, fuel cells, circuits, etc., can solve problems such as increasing membrane electrode flooding, increasing system volume, and reducing fuel cell engine volume specific power.

Pending Publication Date: 2022-07-01
FTXT ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, an external humidifier will increase the volume of the system and reduce the volume specific power of the fuel cell engine
Moreover, with the operation of the stack, the humidity of the internal gas will gradually increase, and when the humidity exceeds 100%, water vapor will precipitate and become liquid water, which will increase the possibility of membrane electrode flooding

Method used

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  • Flow channel structure for internal water management of fuel cell and polar plate and cell with flow channel structure
  • Flow channel structure for internal water management of fuel cell and polar plate and cell with flow channel structure
  • Flow channel structure for internal water management of fuel cell and polar plate and cell with flow channel structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] see figure 1 , this embodiment provides a flow channel structure for internal water management of a fuel cell, the flow channel structure is used to be embedded in the fuel cell electrode plate, the flow channel structure includes: a plurality of water delivery capillaries 1, a plurality of water absorption capillaries 2 and a spray Water capillary 3. When the flow channel structure is used to be installed in the pole plate, it is preferably installed on the shoulder of the pole plate. Both ends of the water delivery capillary 1 are closed, extending from the air inlet area of ​​the air channel to the air outlet area of ​​the air channel; the water outlet end of the water suction capillary 2 is connected with the water delivery capillary 1, and the water inlet end is connected with the outlet area of ​​the air channel ; The water inlet end of the water spray capillary 3 communicates with the water delivery capillary 1, and the water outlet end communicates with the inl...

Embodiment 2

[0044] see figure 2 and image 3 , this embodiment provides a flow channel structure for water management inside a fuel cell with both a drainage function. On the basis of Embodiment 1, the flow channel structure further includes a drainage ditch 4 located in the air outlet area, and the drainage ditch 4 is close to The bottom surface of the air flow channel 7 communicates with the air flow channel 7 through the open surface 6 of the groove body. Due to the flow of the passing air, water will accumulate in the outlet area of ​​the flow channel, and the drainage ditch 4 can increase the cross-sectional area of ​​the flow channel in the outlet area and reduce the flooding tendency of the outlet area of ​​the flow channel. The inner surface of the drainage ditch is treated with hydrophilic treatment to keep the water away from the membrane electrode and close to the bottom surface of the flow channel to reduce the degree of flooding.

[0045] The flow channel structure provide...

Embodiment 3

[0052] This embodiment provides an electrode plate for a fuel cell, and the electrode plate is embedded with the flow channel structure for internal water management of the fuel cell provided in Embodiment 1 or Embodiment 2. The fuel cell electrode plate provided in this embodiment will be described by taking the example of the flow channel structure for internal water management of the fuel cell provided in Embodiment 2 being embedded. see image 3 and Figure 4 , the flow channel structure is preferably embedded in the shoulder 8 of the fuel cell plate, and the air flow channel 7 is narrowed at the water spray capillary, that is, the cross section of the plate flow channel at the water spray capillary 3 is properly shrunk, and the flow channel cross-sectional area decreases, the air flow rate increases, the pressure decreases accordingly, the water in the water delivery capillary 1 is more likely to be ejected, and the cross-section of the air flow channel shrinks as follow...

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PUM

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Abstract

The invention discloses a flow channel structure for internal water management of a fuel cell, a polar plate with the flow channel structure and a cell with the flow channel structure. The flow channel structure for internal water management of the fuel cell is used for being embedded into a fuel cell polar plate and comprises a water delivery capillary tube, a water absorption capillary tube and a water spraying capillary tube, wherein the water delivery capillary tube extends from an air inlet area of the air flow channel to an air outlet area of the membrane electrode; one end of the water absorption capillary is connected with the water delivery capillary, and the other end is communicated with the outlet area of the air flow channel; one end of the water spraying capillary is connected with the water conveying capillary, and the other end is communicated with the inlet area of the air flow channel. Moisture in the air outlet area of the cathode flow channel is conveyed to the air inlet area through the capillary structure, and management of moisture in the air flow channel is achieved.

Description

technical field [0001] The invention relates to the field of internal water management of fuel cells, in particular to a flow channel structure for internal water management of fuel cells, a pole plate for fuel cells and a fuel cell. Background technique [0002] Proton exchange membrane fuel cell is a clean and efficient power generation device, which can achieve zero pollutant emission while generating electricity, which is very beneficial to improve the environmental pollution caused by modern industry. The interior of modern proton exchange membrane fuel cells is mainly composed of membrane electrodes, bipolar plates, current collector plates, manifold end plates, and insulation, sealing and fastening devices. [0003] Membrane electrodes are the heart of fuel cells and are used to convert the chemical energy of fuel into electrical energy. During the power generation process, the hydrogen on the anode side is reduced to hydrogen ions and electrons under the action of t...

Claims

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Application Information

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IPC IPC(8): H01M8/0258H01M8/0202H01M8/04119
CPCH01M8/0258H01M8/0202H01M8/04119
Inventor 李凯郑峰代一帮周芳灵
Owner FTXT ENERGY TECH CO LTD