CN109768285B - A bipolar plate for proton exchange membrane fuel cell with uniform thermal conductivity - Google Patents

Abstract

The invention belongs to the technical field of fuel cells, in particular to a proton exchange membrane fuel cell bipolar plate with uniform thermal conductivity, comprising a diffusion layer and a catalytic layer. The phase-change thermally conductive insulating tubes are distributed between the diffusion layer and the catalytic layer in a rectangular array. The middle outer surface of the phase-change thermally conductive insulating tubes is fixedly sleeved with a proton exchange membrane, and the proton exchange membrane is located between the diffusion layer and the catalytic layer. , a positioning frame is fixedly installed on the opposite surfaces of the diffusion layer and the catalytic layer. The proton exchange membrane fuel cell bipolar plate with uniform thermal conductivity is fixed and connected through a phase-change heat conduction insulating tube by arranging the opposite surfaces of the diffusion layer and the catalytic layer, so as to achieve the effect of guiding and conducting the heat inside the diffusion layer and the catalytic layer, The heat accumulation in the diffusion layer and the catalytic layer is prevented from negatively affecting the cell, thereby solving the technical problem of low thermal conductivity of the existing fuel cell.

Description

A bipolar plate for proton exchange membrane fuel cell with uniform thermal conductivity

technical field

The invention relates to the technical field of fuel cells, in particular to a proton exchange membrane fuel cell bipolar plate with uniform thermal conductivity.

Background technique

A fuel cell is a chemical device that directly converts the chemical energy of fuel into electrical energy, also known as an electrochemical generator. It is the fourth power generation technology after hydropower, thermal power and atomic power. Because the fuel cell converts the Gibbs free energy part of the chemical energy of the fuel into electrical energy through electrochemical reaction, it is not limited by the Carnot cycle effect, so the efficiency is high; in addition, the fuel cell uses fuel and oxygen as raw materials; There are no mechanical transmission parts, so there is no noise pollution and very few harmful gases are emitted. It can be seen that from the perspective of saving energy and protecting the ecological environment, fuel cells are the most promising power generation technology.

At present, the flow channels used in the heat conduction of fuel cells are mainly divided into single serpentine flow channels, multi-serpentine flow channels, interdigitated flow channels, and bionic fractal heterogeneous flow channels. The fluid flows in a "smooth" pipeline, thereby reducing the pressure drop of the fluid and maximizing the uniform distribution of the fluid in the branch, but the heat recovery rate of the water in the diffusion layer in the bipolar plate when it is discharged The main reason is that if the recovery passes through the flow channel, the thermal conductivity is low, and it is easy to hinder the flow of the reaction gas, which affects the power generation performance, and the conductor material used in the electrode plate is heavy, which is easy to increase the weight of the entire battery.

SUMMARY OF THE INVENTION

Based on the technical problems of low thermal conductivity, low recovery rate and heavy quality of the existing fuel cell, the present invention proposes a proton exchange membrane fuel cell bipolar plate with uniform thermal conductivity.

A proton exchange membrane fuel cell bipolar plate with uniform thermal conductivity proposed by the present invention is located on the surface opposite to the catalyst layer of the proton exchange membrane fuel cell, and the proton exchange membrane fuel cell sequentially includes a proton exchange membrane, The catalytic layer 2, the bipolar plate and the diffusion layer 1, the opposite surfaces of the two catalytic layers are fixedly connected with a proton exchange membrane, the opposite surfaces of the two catalytic layers are respectively fixedly connected to the opposite surfaces of the two diffusion layers, and the catalytic layers are opposite to each other. The surface of the phase change thermally conductive insulating tube is fixedly connected with the phase-change thermally conductive insulating tube, the surface of the phase-change thermally conductive insulating tube penetrates the proton exchange membrane, and a plurality of phase-change thermally conductive insulating tubes are distributed on the surface of the catalytic layer in a rectangular array. The location in the membrane fuel cell is divided into a cathode plate 6 and an anode plate 7 .

A positioning frame is fixedly installed on the surfaces opposite to the diffusion layer and the catalytic layer, and a cathode plate and an anode plate are fixedly connected to the inner wall of the positioning frame and the opposite surfaces of the two catalytic layers respectively, and a plurality of cathode plates and anode plates are distributed in a rectangular array respectively. on the surface opposite the catalytic layer.

The inside of the diffusion layer is respectively fixed with a guide tube and a fluid tube.

Preferably, the inner wall of the phase-change heat-conducting insulating tube is fixed and bonded with a waterproof film through a heat-conducting adhesive layer, the interior of the heat-conducting adhesive layer is provided with a heat-conducting adhesive, and the guide pipe penetrates to the inner surface of the waterproof film.

Preferably, a water outlet groove is formed on the surface of the diffusion layer, and the inner wall of the water outlet groove is respectively connected with the bottom end of the guide pipe and the bottom end of the fluid pipe, and the fluid pipe is divided into the first fluid pipe, the second fluid pipe, the third fluid pipe and the fluid pipe. N, the surfaces of the first fluid pipe, the second fluid pipe, the third fluid pipe and the fluid pipe N are in the shape of an arc.

Preferably, the first fluid pipe, the second fluid pipe, the third fluid pipe and the fluid pipe N are connected with the guide pipe in a spiral distribution.

Preferably, the manufacturing methods of the cathode plate and the anode plate include steps S1, taking 65% of natural rubber to make a plate shape; S2, digging the middle of the plate-shaped natural rubber into a hollow, and filling 20% conductive particles; S3, in the plate Circular through holes are formed on both sides of the natural rubber shaped like natural rubber, the inner walls of the through holes are fixedly inserted with conductive graphite rods, and the surfaces of the conductive graphite rods are in contact with the conductive particles.

Preferably, the inner wall of the hollow natural rubber in step S2 is coated with a layer of carbon black, and the thickness of the carbon black is 1mm-3mm.

Preferably, in step S3, the surface of the conductive graphite rod and the inner wall of the through hole are inserted with thermal conductive glue.

Preferably, in step S2, 10%-15% conductive glue is added to the conductive particles, stirred evenly, poured into the hollow position of natural rubber, and pressed with a bead suitable for the length and width of the hollow, so that the conductive particles and the conductive graphite rod are pressed together. The surface is bonded as a whole.

Preferably, 3%-5% of anti-aging agent, 1%-2% of dimethyl silicone oil and 3% of white carbon black are respectively added into the conductive adhesive.

The beneficial effects in the present invention are:

1. By setting the opposite surfaces of the catalytic layer to be fixedly connected with phase-change thermally conductive insulating tubes, the effect of guiding and conducting the heat inside the diffusion layer and the catalytic layer is achieved, and the heat accumulation in the diffusion layer and the catalytic layer is prevented from causing damage to the battery. negative impact, thereby solving the technical problem of low thermal conductivity of the existing fuel cell.

2. By setting the inside of the diffusion layer, a diversion tube and a fluid tube are respectively fixed and installed. The fluid tube 1, the fluid tube 2, the fluid tube 3 and the fluid tube N are spirally distributed with the diversion tube, which achieves the bionic fractal. The spatial distribution of the heterogeneous flow channels can achieve the effect of splitting heat absorption and heat conduction for different water flow rates. When the water flow rate is small, it can flow in the fluid pipe 1 with the lower port, the fluid pipe 2 and the fluid pipe 3 and The fluid pipe N is used for the circulation of the reaction gas. When the water flow rate is large, the water is shunted out by the fluid pipe 1 and the fluid pipe 2 at the same time to achieve the shunting. The fluid pipe 3 and the fluid pipe N are used for the circulation of the reaction gas, making full use of multiple fluids. The pipe guides the water, while the pipe wall absorbs a certain amount of heat, thereby solving the technical problems of low thermal conductivity, low recovery rate and heavy quality of the existing fuel cell.

3. By setting the manufacturing method of the cathode plate and the anode plate, the function of using the conductive rubber to be light and conductive is achieved, and the mass of the cathode plate and the anode plate is kept conductive while reducing the mass, thereby solving the existing technology of heavy weight of the fuel cell. question.

Description of drawings

1 is a schematic diagram of a proton exchange membrane fuel cell bipolar plate with uniform thermal conductivity proposed by the present invention;

2 is a perspective view of the distribution of the fluid tube structure of a proton exchange membrane fuel cell bipolar plate with uniform thermal conductivity proposed by the present invention;

3 is a cross-sectional view of the diffusion layer structure on both sides of a proton exchange membrane fuel cell bipolar plate with uniform thermal conductivity proposed by the present invention;

4 is a cross-sectional view of the diffusion layer structure on both sides of the bipolar plate of a proton exchange membrane fuel cell with uniform thermal conductivity proposed by the present invention with a small flow rate;

5 is a cross-sectional view of the diffusion layer structure on both sides of the bipolar plate of a proton exchange membrane fuel cell with uniform thermal conductivity proposed by the present invention when the flow rate is large.

In the figure: 1. Diffusion layer; 2. Catalytic layer; 3. Phase change thermal conduction insulating tube; 4. Proton exchange membrane; 5. Positioning frame; 6. Cathode plate; 7. Anode plate; Fluid pipe one; 91, fluid pipe two; 92, fluid pipe three; 93, fluid pipe N; 10, waterproof film; 11, heat conduction adhesive layer; 12, water outlet.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments.

Referring to Figures 1-5, a proton exchange membrane fuel cell bipolar plate with uniform thermal conductivity, as shown in Figure 1, is located on the opposite surface of the catalyst layer, and the proton exchange membrane fuel cell includes from the center to both sides The proton exchange membrane, the catalytic layer 2, the bipolar plate and the diffusion layer 1, the opposite surfaces of the two catalytic layers 2 are fixedly connected with the proton exchange membrane 4, and the opposite surfaces of the two catalytic layers 2 are respectively opposite to the two diffusion layers 1 The surface of the catalyst layer 2 is fixedly connected, and the opposite surfaces of the catalytic layer 2 are fixedly connected with a phase-change thermally conductive insulating tube 3. The surface of the phase-change thermally conductive insulating tube 3 penetrates the proton exchange membrane 4, and a plurality of phase-change thermally conductive insulating tubes 3 are distributed in a rectangular array. On the surface of the catalytic layer 2, the bipolar plate is divided into a cathode plate 6 and an anode plate 7 according to the position in the proton exchange membrane fuel cell.

As shown in FIG. 2 , by setting the opposite surfaces of the catalytic layer 2 to be fixedly connected with the phase-change thermally conductive insulating tubes 3 , the effect of guiding and conducting the heat inside the diffusion layer 1 and the catalytic layer 2 is achieved, preventing the diffusion layer 1 and the catalytic layer. Heat accumulation in layer 2 negatively affects the cell, thus solving the technical problem of low thermal conductivity of existing fuel cells; the thermally conductive phase change material PC is a heat-enhancing polymer designed to enable power-consuming electronic devices and The thermal resistance between the connected heat sinks is reduced to a minimum.

As shown in Figure 1-2, a positioning frame 5 is fixedly installed on the surfaces of the diffusion layer 1 and the catalytic layer 2 opposite to each other, and the inner wall of the positioning frame 5 is fixedly connected to the surfaces of the two catalytic layers 2 opposite to the cathode plates 6 and 2 respectively. The anode plate 7 , a plurality of cathode plates 6 and anode plates 7 are respectively distributed in a rectangular array on the opposite surface of the catalytic layer 2 .

The manufacturing methods of the cathode plate 6 and the anode plate 7 include steps S1, taking 65% natural rubber to make a plate shape; S2, digging the middle of the plate-shaped natural rubber into a hollow, and filling 20% conductive particles; S3, in the plate shape The surfaces of both sides of the natural rubber are provided with circular through holes, the inner walls of the through holes are fixedly plugged with conductive graphite rods, and the surfaces of the conductive graphite rods are in contact with the conductive particles; the inner walls of the hollow natural rubber in step S2 are coated with a layer of carbon black, and The thickness of the carbon black is 1mm-3mm; in step S3, the surface of the conductive graphite rod and the inner wall of the through hole are inserted with thermally conductive glue; in step S2, 10%-15% of the conductive glue is added to the conductive particles, stirred evenly, and filled with natural rubber In the hollow position, press with a bead suitable for the length and width of the hollow, so that the conductive particles and the surface of the conductive graphite rod are bonded together; 3%-5% antioxidant, 1%-2% Methyl silicone oil and 3% silica.

By arranging the manufacturing method of the cathode plate and the anode plate, the function of using the conductive rubber to be light and conductive is achieved, and the mass of the cathode plate 6 and the anode plate 7 is kept conductive, and the mass is reduced, thereby solving the problem of the existing technology of the fuel cell with heavier mass question.

The inside of the diffusion layer 1 is respectively fixed with a guide tube 8 and a fluid tube; the inner wall of the phase-change heat-conducting insulating tube 3 is fixedly bonded with a waterproof film 10 through a heat-conducting adhesive layer 11 , and a heat-conducting adhesive is arranged inside the heat-conducting adhesive layer 11 to conduct heat. Double-sided tape is made of acrylic polymer filled with thermally conductive ceramic powder and compounded with silicone adhesive. It has the characteristics of high thermal conductivity and insulation, and has softness, compressibility, conformity, and strong viscosity. It can adapt to a large temperature range, can fill uneven surfaces, and can tightly and firmly fit heat source devices and heat sinks to quickly conduct heat.

As shown in FIG. 3, the guide pipe 8 penetrates to the inner surface of the waterproof membrane 10; the surface of the diffusion layer 1 is provided with a water outlet groove 12, and the inner wall of the water outlet groove 12 is respectively connected with the bottom end of the guide pipe 8 and the bottom end of the fluid pipe. Connected, the fluid pipe is divided into fluid pipe one 9, fluid pipe two 91, fluid pipe three 92 and fluid pipe N93, and the surfaces of fluid pipe one 9, fluid pipe two 91, fluid pipe three 92 and fluid pipe N93 are arc-shaped; Fluid pipe 1 9, fluid pipe 2 91, fluid pipe 3 92 and fluid pipe N93 are spirally distributed at the joints with the guide pipe 8; The top of the tube is in fixed communication with the inner wall of the guide tube 8 .

As shown in Fig. 3-5, by setting the inside of the diffusion layer 1, a guide tube 8 and a fluid tube are respectively fixed and installed, the fluid tube 1 9, the fluid tube 2 91, the fluid tube 3 92, the fluid tube N93 and the guide tube 8 The connection is spirally distributed, which achieves the spatial three-dimensional distribution of the bionic fractal heterogeneous flow channels, and can achieve the effect of splitting heat absorption and heat conduction for different water flow rates. When the water flow rate is small, as shown in Figure 4, it can be The fluid pipe one 9 with the lower port flows, the fluid pipe two 91, the fluid pipe three 92 and the fluid pipe N93 are used for the circulation of the reaction gas. When the water flow rate is large, as shown in Fig. The second fluid pipe 91 splits out at the same time to achieve split flow. The third fluid pipe 92 and the fluid pipe N93 are used for the circulation of the reaction gas, making full use of multiple fluid pipes to divert the water, and at the same time the pipe wall absorbs a certain amount of heat, thus solving the existing problem. The technical problems of low thermal conductivity, low recovery rate and heavier mass of fuel cells.

Example 1

Referring to Figures 1-5, a proton exchange membrane fuel cell bipolar plate with uniform thermal conductivity, as shown in Figure 1, is located on the opposite surface of the catalyst layer, and the proton exchange membrane fuel cell includes from the center to both sides The proton exchange membrane, the catalytic layer 2, the bipolar plate and the diffusion layer 1, the opposite surfaces of the two catalytic layers 2 are fixedly connected with the proton exchange membrane 4, and the opposite surfaces of the two catalytic layers 2 are respectively opposite to the two diffusion layers 1 The surface of the catalyst layer 2 is fixedly connected, and the opposite surfaces of the catalytic layer 2 are fixedly connected with a phase-change thermally conductive insulating tube 3. The surface of the phase-change thermally conductive insulating tube 3 penetrates the proton exchange membrane 4, and a plurality of phase-change thermally conductive insulating tubes 3 are distributed in a rectangular array. On the surface of the catalytic layer 2, the bipolar plate is divided into a cathode plate 6 and an anode plate 7 according to the position in the proton exchange membrane fuel cell.

As shown in FIG. 2 , by setting the opposite surfaces of the catalytic layer 2 to be fixedly connected with the phase-change thermally conductive insulating tubes 3 , the effect of guiding and conducting the heat inside the diffusion layer 1 and the catalytic layer 2 is achieved, preventing the diffusion layer 1 and the catalytic layer. Heat accumulation in layer 2 negatively affects the cell, thus solving the technical problem of low thermal conductivity of existing fuel cells; the thermally conductive phase change material PC is a heat-enhancing polymer designed to enable power-consuming electronic devices and The thermal resistance between the connected heat sinks is reduced to a minimum.

As shown in Figure 1-2, a positioning frame 5 is fixedly installed on the surfaces of the diffusion layer 1 and the catalytic layer 2 opposite to each other, and the inner wall of the positioning frame 5 is fixedly connected to the surfaces of the two catalytic layers 2 opposite to the cathode plates 6 and 2 respectively. The anode plate 7 , a plurality of cathode plates 6 and anode plates 7 are respectively distributed in a rectangular array on the opposite surface of the catalytic layer 2 .

The manufacturing methods of the cathode plate 6 and the anode plate 7 include steps S1, taking 65% natural rubber to make a plate shape; S2, digging the middle of the plate-shaped natural rubber into a hollow, and filling 20% conductive particles; S3, in the plate shape The surfaces of both sides of the natural rubber are provided with circular through holes, the inner walls of the through holes are fixedly plugged with conductive graphite rods, and the surfaces of the conductive graphite rods are in contact with the conductive particles; the inner walls of the hollow natural rubber in step S2 are coated with a layer of carbon black, and The thickness of carbon black is 1 mm; in step S3, the surface of the conductive graphite rod and the inner wall of the through hole are inserted with thermally conductive glue; in step S2, 10% conductive glue is added to the conductive particles, stirred evenly, and poured into the hollow position of natural rubber, and used Pressing a bead suitable for the length and width of the hollow makes the conductive particles adhere to the surface of the conductive graphite rod as a whole; 3% anti-aging agent, 1% dimethyl silicone oil and 3% white carbon black are respectively added to the conductive adhesive.

By arranging the manufacturing method of the cathode plate and the anode plate, the function of using the conductive rubber to be light and conductive is achieved, and the mass of the cathode plate 6 and the anode plate 7 is kept conductive, and the mass is reduced, thereby solving the problem of the existing technology of the fuel cell with heavier mass question.

The inside of the diffusion layer 1 is respectively fixed with a guide tube 8 and a fluid tube; the inner wall of the phase-change heat-conducting insulating tube 3 is fixedly bonded with a waterproof film 10 through a heat-conducting adhesive layer 11 , and a heat-conducting adhesive is arranged inside the heat-conducting adhesive layer 11 to conduct heat. Double-sided tape is made of acrylic polymer filled with thermally conductive ceramic powder and compounded with silicone adhesive. It has the characteristics of high thermal conductivity and insulation, and has softness, compressibility, conformity, and strong viscosity. It can adapt to a large temperature range, can fill uneven surfaces, and can tightly and firmly fit heat source devices and heat sinks to quickly conduct heat.

As shown in FIG. 3, the guide pipe 8 penetrates to the inner surface of the waterproof membrane 10; the surface of the diffusion layer 1 is provided with a water outlet groove 12, and the inner wall of the water outlet groove 12 is respectively connected with the bottom end of the guide pipe 8 and the bottom end of the fluid pipe. Connected, the fluid pipe is divided into fluid pipe one 9, fluid pipe two 91, fluid pipe three 92 and fluid pipe N93, and the surfaces of fluid pipe one 9, fluid pipe two 91, fluid pipe three 92 and fluid pipe N93 are arc-shaped; Fluid pipe 1 9, fluid pipe 2 91, fluid pipe 3 92 and fluid pipe N93 are spirally distributed at the joints with the guide pipe 8; The top of the tube is in fixed communication with the inner wall of the guide tube 8 .

As shown in Fig. 3-5, by setting the inside of the diffusion layer 1, a diversion tube 8 and a fluid tube are respectively fixed and installed, the fluid tube 1 9, the fluid tube 2 91, the fluid tube 3 92, the fluid tube N93 and the diversion tube 8 The connection is spirally distributed, which achieves the spatial three-dimensional distribution of the bionic fractal heterogeneous flow channels, and can achieve the effect of splitting heat absorption and heat conduction for different water flow rates. When the water flow rate is small, as shown in Figure 4, it can be The fluid pipe one 9 with the lower port flows in, the fluid pipe two 91, the fluid pipe three 92 and the fluid pipe N93 are used for the circulation of the reaction gas. When the water flow rate is large, as shown in Fig. The second fluid pipe 91 is shunted out at the same time to achieve shunting. The fluid pipe 3 92 and the fluid pipe N93 are used for the circulation of the reaction gas, making full use of multiple fluid pipes to divert the water, and the pipe wall absorbs a certain amount of heat, thus solving the existing problem. Technical Problems of Low Thermal Conductivity, Low Recovery and Heavy Mass of Fuel Cells

Embodiment 2

Referring to Figures 1-5, a proton exchange membrane fuel cell bipolar plate with uniform thermal conductivity, as shown in Figure 1, is located on the opposite surface of the catalyst layer, and the proton exchange membrane fuel cell includes from the center to both sides The proton exchange membrane, the catalytic layer 2, the bipolar plate and the diffusion layer 1, the opposite surfaces of the two catalytic layers 2 are fixedly connected with the proton exchange membrane 4, and the opposite surfaces of the two catalytic layers 2 are respectively opposite to the two diffusion layers 1 The surface of the catalyst layer 2 is fixedly connected, and the opposite surfaces of the catalytic layer 2 are fixedly connected with a phase-change thermally conductive insulating tube 3. The surface of the phase-change thermally conductive insulating tube 3 penetrates the proton exchange membrane 4, and a plurality of phase-change thermally conductive insulating tubes 3 are distributed in a rectangular array. On the surface of the catalytic layer 2, the bipolar plate is divided into a cathode plate 6 and an anode plate 7 according to the position in the proton exchange membrane fuel cell.

As shown in FIG. 2 , by setting the opposite surfaces of the catalytic layer 2 to be fixedly connected with the phase-change thermally conductive insulating tubes 3 , the effect of guiding and conducting the heat inside the diffusion layer 1 and the catalytic layer 2 is achieved, preventing the diffusion layer 1 and the catalytic layer. Heat accumulation in layer 2 negatively affects the cell, thus solving the technical problem of low thermal conductivity of existing fuel cells; the thermally conductive phase change material PC is a heat-enhancing polymer designed to enable power-consuming electronic devices and The thermal resistance between the connected heat sinks is reduced to a minimum.

As shown in Figure 1-2, a positioning frame 5 is fixedly installed on the surfaces of the diffusion layer 1 and the catalytic layer 2 opposite to each other, and the inner wall of the positioning frame 5 is fixedly connected to the surfaces of the two catalytic layers 2 opposite to the cathode plates 6 and 2 respectively. The anode plate 7 , a plurality of cathode plates 6 and anode plates 7 are respectively distributed in a rectangular array on the opposite surface of the catalytic layer 2 .

The manufacturing methods of the cathode plate 6 and the anode plate 7 include steps S1, taking 65% natural rubber to make a plate shape; S2, digging the middle of the plate-shaped natural rubber into a hollow, and filling 20% conductive particles; S3, in the plate shape The surfaces of both sides of the natural rubber are provided with circular through holes, the inner walls of the through holes are fixedly plugged with conductive graphite rods, and the surfaces of the conductive graphite rods are in contact with the conductive particles; the inner walls of the hollow natural rubber in step S2 are coated with a layer of carbon black, and The thickness of the carbon black is 2 mm; in step S3, the surface of the conductive graphite rod and the inner wall of the through hole are inserted with thermally conductive adhesive; in step S2, 12% conductive adhesive is added to the conductive particles, stirred evenly, poured into the natural rubber hollow position, and used Pressing a bead suitable for the length and width of the hollow makes the conductive particles adhere to the surface of the conductive graphite rod as a whole; 4% anti-aging agent, 1.5% dimethyl silicone oil and 3% silica are added to the conductive adhesive.

By arranging the manufacturing method of the cathode plate and the anode plate, the function of using the conductive rubber to be light and conductive is achieved, and the mass of the cathode plate 6 and the anode plate 7 is kept conductive, and the mass is reduced, thereby solving the problem of the existing technology of the fuel cell with heavier mass question.

The inside of the diffusion layer 1 is respectively fixed with a guide tube 8 and a fluid tube; the inner wall of the phase-change heat-conducting insulating tube 3 is fixedly bonded with a waterproof film 10 through a heat-conducting adhesive layer 11 , and a heat-conducting adhesive is arranged inside the heat-conducting adhesive layer 11 to conduct heat. Double-sided tape is made of acrylic polymer filled with thermally conductive ceramic powder and compounded with silicone adhesive. It has the characteristics of high thermal conductivity and insulation, and has softness, compressibility, conformity, and strong viscosity. It can adapt to a large temperature range, can fill uneven surfaces, and can tightly and firmly fit heat source devices and heat sinks to quickly conduct heat.

As shown in FIG. 3, the guide pipe 8 penetrates to the inner surface of the waterproof membrane 10; the surface of the diffusion layer 1 is provided with a water outlet groove 12, and the inner wall of the water outlet groove 12 is respectively connected with the bottom end of the guide pipe 8 and the bottom end of the fluid pipe. Connected, the fluid pipe is divided into fluid pipe one 9, fluid pipe two 91, fluid pipe three 92 and fluid pipe N93, and the surfaces of fluid pipe one 9, fluid pipe two 91, fluid pipe three 92 and fluid pipe N93 are arc-shaped; Fluid pipe 1 9, fluid pipe 2 91, fluid pipe 3 92 and fluid pipe N93 are spirally distributed at the joints with the guide pipe 8; The top of the tube is in fixed communication with the inner wall of the guide tube 8 .

As shown in Fig. 3-5, by setting the inside of the diffusion layer 1, a guide tube 8 and a fluid tube are respectively fixed and installed, the fluid tube 1 9, the fluid tube 2 91, the fluid tube 3 92, the fluid tube N93 and the guide tube 8 The connection is spirally distributed, which achieves the spatial three-dimensional distribution of the bionic fractal heterogeneous flow channels, and can achieve the effect of splitting heat absorption and heat conduction for different water flow rates. When the water flow rate is small, as shown in Figure 4, it can be The fluid pipe one 9 with the lower port flows, the fluid pipe two 91, the fluid pipe three 92 and the fluid pipe N93 are used for the circulation of the reaction gas. When the water flow rate is large, as shown in Fig. The second fluid pipe 91 splits out at the same time to achieve split flow. The third fluid pipe 92 and the fluid pipe N93 are used for the circulation of the reaction gas, making full use of multiple fluid pipes to divert the water, and at the same time the pipe wall absorbs a certain amount of heat, thus solving the existing problem. The technical problems of low thermal conductivity, low recovery rate and heavier mass of fuel cells.

Embodiment 3

Referring to Figures 1-5, a proton exchange membrane fuel cell bipolar plate with uniform thermal conductivity, as shown in Figure 1, is located on the opposite surface of the catalyst layer, and the proton exchange membrane fuel cell includes from the center to both sides The proton exchange membrane, the catalytic layer 2, the bipolar plate and the diffusion layer 1, the opposite surfaces of the two catalytic layers 2 are fixedly connected with the proton exchange membrane 4, and the opposite surfaces of the two catalytic layers 2 are respectively opposite to the two diffusion layers 1 The surface of the catalyst layer 2 is fixedly connected, and the opposite surfaces of the catalytic layer 2 are fixedly connected with a phase-change thermally conductive insulating tube 3. The surface of the phase-change thermally conductive insulating tube 3 penetrates the proton exchange membrane 4, and a plurality of phase-change thermally conductive insulating tubes 3 are distributed in a rectangular array. On the surface of the catalytic layer 2, the bipolar plate is divided into a cathode plate 6 and an anode plate 7 according to the position in the proton exchange membrane fuel cell.

As shown in FIG. 2 , by setting the opposite surfaces of the catalytic layer 2 to be fixedly connected with the phase-change thermally conductive insulating tubes 3 , the effect of guiding and conducting the heat inside the diffusion layer 1 and the catalytic layer 2 is achieved, preventing the diffusion layer 1 and the catalytic layer. Heat accumulation in layer 2 negatively affects the cell, thus solving the technical problem of low thermal conductivity of existing fuel cells; the thermally conductive phase change material PC is a heat-enhancing polymer designed to enable power-consuming electronic devices and The thermal resistance between the connected heat sinks is reduced to a minimum.

As shown in Figure 1-2, a positioning frame 5 is fixedly installed on the surfaces of the diffusion layer 1 and the catalytic layer 2 opposite to each other, and the inner wall of the positioning frame 5 is fixedly connected to the surfaces of the two catalytic layers 2 opposite to the cathode plates 6 and 2 respectively. The anode plate 7 , a plurality of cathode plates 6 and anode plates 7 are respectively distributed in a rectangular array on the opposite surface of the catalytic layer 2 .

The manufacturing methods of the cathode plate 6 and the anode plate 7 include steps S1, taking 65% natural rubber to make a plate shape; S2, digging the middle of the plate-shaped natural rubber into a hollow, and filling 20% conductive particles; S3, in the plate shape The surfaces of both sides of the natural rubber are provided with circular through holes, the inner walls of the through holes are fixedly plugged with conductive graphite rods, and the surfaces of the conductive graphite rods are in contact with the conductive particles; the inner walls of the hollow natural rubber in step S2 are coated with a layer of carbon black, and The thickness of the carbon black is 3 mm; in step S3, the surface of the conductive graphite rod and the inner wall of the through hole are inserted with thermal conductive glue; in step S2, 15% conductive glue is added to the conductive particles, stirred evenly, poured into the hollow position of natural rubber, and used Pressing a bead suitable for the length and width of the hollow makes the conductive particles adhere to the surface of the conductive graphite rod as a whole; 5% anti-aging agent, 2% dimethyl silicone oil and 3% white carbon black are respectively added to the conductive adhesive.

By arranging the manufacturing method of the cathode plate and the anode plate, the function of using the conductive rubber to be light and conductive is achieved, and the mass of the cathode plate 6 and the anode plate 7 is kept conductive, and the mass is reduced, thereby solving the problem of the existing technology of the fuel cell with heavier mass question.

The inside of the diffusion layer 1 is respectively fixed with a guide tube 8 and a fluid tube; the inner wall of the phase-change heat-conducting insulating tube 3 is fixedly bonded with a waterproof film 10 through a heat-conducting adhesive layer 11 , and a heat-conducting adhesive is arranged inside the heat-conducting adhesive layer 11 to conduct heat. Double-sided tape is made of acrylic polymer filled with thermally conductive ceramic powder and compounded with silicone adhesive. It has the characteristics of high thermal conductivity and insulation, and has softness, compressibility, conformity, and strong viscosity. It can adapt to a large temperature range, can fill uneven surfaces, and can tightly and firmly fit heat source devices and heat sinks to quickly conduct heat.

As shown in FIG. 3, the guide pipe 8 penetrates to the inner surface of the waterproof membrane 10; the surface of the diffusion layer 1 is provided with a water outlet groove 12, and the inner wall of the water outlet groove 12 is respectively connected with the bottom end of the guide pipe 8 and the bottom end of the fluid pipe. Connected, the fluid pipe is divided into fluid pipe one 9, fluid pipe two 91, fluid pipe three 92 and fluid pipe N93, and the surfaces of fluid pipe one 9, fluid pipe two 91, fluid pipe three 92 and fluid pipe N93 are arc-shaped; Fluid pipe 1 9, fluid pipe 2 91, fluid pipe 3 92 and fluid pipe N93 are spirally distributed at the joints with the guide pipe 8; The top of the tube is in fixed communication with the inner wall of the guide tube 8 .

As shown in Fig. 3-5, by setting the inside of the diffusion layer 1, a guide tube 8 and a fluid tube are respectively fixed and installed, the fluid tube 1 9, the fluid tube 2 91, the fluid tube 3 92, the fluid tube N93 and the guide tube 8 The connection is spirally distributed, which achieves the spatial three-dimensional distribution of the bionic fractal heterogeneous flow channels, and can achieve the effect of splitting heat absorption and heat conduction for different water flow rates. When the water flow rate is small, as shown in Figure 4, it can be The fluid pipe one 9 with the lower port flows, the fluid pipe two 91, the fluid pipe three 92 and the fluid pipe N93 are used for the circulation of the reaction gas. When the water flow rate is large, as shown in Fig. The second fluid pipe 91 splits out at the same time to achieve split flow. The third fluid pipe 92 and the fluid pipe N93 are used for the circulation of the reaction gas, making full use of multiple fluid pipes to divert the water, and at the same time the pipe wall absorbs a certain amount of heat, thus solving the existing problem. The technical problems of low thermal conductivity, low recovery rate and heavier mass of fuel cells.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. The equivalent replacement or change of the inventive concept thereof shall be included within the protection scope of the present invention.

Claims (8)

1. The utility model provides a proton exchange membrane fuel cell bipolar plate that thermal conductance is even which characterized in that: the proton exchange membrane fuel cell comprises a proton exchange membrane, catalyst layers (2), bipolar plates and diffusion layers (1), wherein the proton exchange membrane, the catalyst layers (2), the bipolar plates and the diffusion layers (1) are sequentially arranged on the surfaces, opposite to the two catalyst layers (2), of the proton exchange membrane (4) respectively, the surfaces, opposite to the two catalyst layers (2), of the proton exchange membrane are fixedly connected with the surfaces, opposite to the two diffusion layers (1), of the two catalyst layers (2), phase-change heat-conducting insulating tubes (3) are fixedly connected with the surfaces, opposite to the catalyst layers (2), of the phase-change heat-conducting insulating tubes (3) penetrate through the proton exchange membrane (4), and the phase-change heat-conducting insulating tubes (3) are distributed on the surfaces of the catalyst layers (; the bipolar plate is divided into a cathode plate (6) and an anode plate (7) according to the position of the bipolar plate in the proton exchange membrane fuel cell;

the surfaces of the diffusion layer (1) and the catalytic layers (2) which are opposite to each other are fixedly provided with a positioning frame (5), the surfaces of the inner wall of the positioning frame (5) which are opposite to the two catalytic layers (2) are respectively and fixedly connected with a cathode plate (6) and an anode plate (7), and the plurality of cathode plates (6) and anode plates (7) are respectively distributed on the surfaces of the catalytic layers (2) which are opposite to each other in a rectangular array manner;

the inside difference fixed mounting of diffusion layer (1) has honeycomb duct (8) and fluid pipe, the top of honeycomb duct (8) and the interior diapire fixed intercommunication of phase transition heat conduction insulating tube (3), the top of fluid pipe and the fixed intercommunication of inner wall of honeycomb duct (8).

2. The pem fuel cell bipolar plate of claim 1 wherein said bipolar plate has a uniform thermal conductance, said bipolar plate comprising: the inner wall of phase transition heat conduction insulating tube (3) is fixed through heat-conducting glue film (11) and is bonded waterproof film (10), the inside of heat-conducting glue film (11) is provided with heat-conducting glue, honeycomb duct (8) run through to the inboard surface of waterproof film (10).

3. The pem fuel cell bipolar plate of claim 1 wherein said bipolar plate has a uniform thermal conductance, said bipolar plate comprising: a water outlet groove (12) is formed in the surface of the diffusion layer (1), the inner wall of the water outlet groove (12) is communicated with the bottom end of the flow guide pipe (8) and the bottom end of the flow pipe respectively, the flow pipe is divided into a first flow pipe (9), a second flow pipe (91), a third flow pipe (92) and a N flow pipe (93), and the surfaces of the first flow pipe (9), the second flow pipe (91), the third flow pipe (92) and the N flow pipe (93) are in an arc shape.

4. The pem fuel cell bipolar plate of claim 3 wherein said bipolar plate has a uniform thermal conductance, said bipolar plate comprising: and the joints of the fluid pipe I (9), the fluid pipe II (91), the fluid pipe III (92) and the fluid pipe N (93) and the flow guide pipe (8) are spirally distributed.

5. The pem fuel cell bipolar plate of claim 1 wherein said bipolar plate has a uniform thermal conductance, said bipolar plate comprising: the manufacturing method of the cathode plate (6) and the anode plate (7) comprises the step S1 of taking 65 percent of natural rubber to prepare plate-shaped materials; s2, hollowing the middle part of the plate-shaped natural rubber, and filling 20% of conductive particles; s3, forming circular through holes in the surfaces of two sides of the platy natural rubber, fixedly inserting conductive graphite rods into the inner walls of the through holes, and enabling the surfaces of the conductive graphite rods to be in contact with conductive particles.

6. The PEM fuel cell bipolar plate of claim 5 wherein said bipolar plate has a uniform thermal conductance, said bipolar plate comprising: in step S2 of the method for manufacturing the cathode plate and the anode plate, a layer of carbon black is coated on the inner wall of the hollow natural rubber, and the thickness of the carbon black is 1mm-3 mm.

7. The PEM fuel cell bipolar plate of claim 5 wherein said bipolar plate has a uniform thermal conductance, said bipolar plate comprising: and in step S3 of the manufacturing method of the cathode plate and the anode plate, the insertion positions of the surfaces of the conductive graphite rods and the inner walls of the through holes are filled with heat conduction glue.

8. The PEM fuel cell bipolar plate of claim 5 wherein said bipolar plate has a uniform thermal conductance, said bipolar plate comprising: adding 10-15% of conductive adhesive into the conductive particles in the step S2 of the manufacturing method of the cathode plate and the anode plate, uniformly stirring, pouring the conductive particles into the hollow position of the natural rubber, and pressing the conductive particles by a pressing strip with the length and width matched with the hollow position to bond the conductive particles and the surface of the conductive graphite rod into a whole; 3-5% of anti-aging agent, 1-2% of dimethyl silicone oil and 3% of white carbon black are respectively added into the conductive adhesive.

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