CN215266397U

CN215266397U - Direct methanol fuel cell stack

Info

Publication number: CN215266397U
Application number: CN202121151390.4U
Authority: CN
Inventors: 祝向齐; 刘绍华
Original assignee: Suzhou Ogawa New Energy Co ltd
Current assignee: Suzhou Ogawa New Energy Co ltd
Priority date: 2021-05-26
Filing date: 2021-05-26
Publication date: 2021-12-21
Anticipated expiration: 2031-05-26

Abstract

A direct methanol fuel cell stack comprises a stack body, wherein the stack body comprises a plurality of bipolar plates, two sides of each bipolar plate are respectively an anode side with an anode flow channel and a cathode side with a cathode flow channel, two ends of each anode flow channel are respectively communicated with a first solution input-output port and a second solution input-output port, two ends of each cathode flow channel are respectively communicated with a first gas input-output port and a second gas input-output port, the left side part of each bipolar plate is provided with an odd number of positioning grooves, the right side part of each bipolar plate is provided with an even number of positioning grooves, the anode flow channels extend along the upper and lower snake-shaped wiring directions, the cathode flow channels extend along the left and right snake-shaped wiring directions, when the direct methanol fuel cell stack is assembled, the front and back sides of the bipolar plates are quickly determined through the flow channels with different trends on the front and back sides of the bipolar plates, the bipolar plates smoothly penetrate through an upper positioning rod and a lower positioning rod, so that the front and back are consistent in the installation and stacking processes, the error of wrong installation and reverse installation is eliminated, the failure probability of the cell stack is reduced, the yield is improved, and the structure is simple.

Description

Direct methanol fuel cell stack

Technical Field

The utility model particularly relates to a direct methanol fuel cell stack.

Background

When the fuel cell stack is installed and stacked, an auxiliary jig is needed for installation, and the assembling jig suitable for the fuel cell stack as shown in patent publication No. CN110690489A comprises a main substrate, wherein a plurality of limiting guide assemblies are vertically arranged on the periphery of the edge of the main substrate, a plurality of limiting assemblies are further arranged on the main substrate, and a holding assembly is arranged on one side of the main substrate. Therefore, the limiting guide is realized through the mutual matching of the limiting upright columns, and the components can be conveniently stacked and combined in sequence to finally form the complete fuel cell stack. Through this equipment tool, avoid appearing the assembly error when guaranteeing assembly efficiency.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a direct methanol fuel cell stack.

In order to solve the technical problem, the utility model discloses a technical scheme is: a direct methanol fuel cell stack comprises a stack body and end plates arranged at two ends of the stack body, wherein the stack body comprises a plurality of bipolar plates, two sides of each bipolar plate are respectively an anode surface with an anode flow channel and a cathode surface with a cathode flow channel, the upper end of each bipolar plate is provided with a first solution input-output port and a first gas input-output port which are parallel to each other from left to right, the lower end of each bipolar plate is provided with a second solution input-output port and a second gas input-output port which are parallel to each other from left to right, two ends of each anode flow channel are respectively communicated with the first solution input-output port and the second solution input-output port, two ends of each cathode flow channel are respectively communicated with the first gas input-output port and the second gas input-output port, and the upper and lower two ends of each bipolar plate are respectively provided with an upper positioning hole and a lower positioning hole, the upper positioning hole is positioned between the first solution input and output port and the first gas input and output port, the lower positioning hole is positioned between the solution second input-output port and the gas second input-output port, the left and right sides of the bipolar plate are respectively provided with a positioning groove, the positioning grooves on the left and right sides of the bipolar plate are different in number and/or staggered up and down, the anode flow channel extends along the upper and lower snake-shaped routing directions, the cathode flow channel extends along the left and right snake-shaped routing directions, the direct methanol fuel cell stack also comprises an upper positioning rod and a lower positioning rod which are respectively inserted into the upper positioning hole and the lower positioning hole, and a plurality of fixing rods which are respectively positioned at the left side and the right side of the bipolar plate and are in inserted fit with the positioning grooves, the upper positioning rod, the lower positioning rod and the plurality of fixing rods are respectively fixed between the two end plates.

In some embodiments, the bipolar plates have two types, one type extending upward from the upper edge to form an upper fin, and the other type extending downward from the lower edge to form a lower fin.

In some embodiments, the left side of the bipolar plate has an odd number of detents and the right side of the bipolar plate has an even number of detents.

In some embodiments, two bipolar plates are stacked in a spaced-apart arrangement to form the stack body for heat dissipation.

In certain embodiments, the solution first and second input-output ports, the gas first and second input-output ports are rectangular holes penetrating the anode and cathode faces, respectively.

In certain embodiments, the anode flow channels and the cathode flow channels are each a plurality of serpentine flow channels, the anode flow channels have 3-5, and the cathode flow channels have 22-26.

The scope of the present invention is not limited to the technical solutions formed by specific combinations of the above technical features, and other technical solutions formed by arbitrary combinations of the above technical features or equivalent features should be covered. For example, the above features and the technical features (but not limited to) having similar functions disclosed in the present application are mutually replaced to form the technical solution.

Because of the application of the technical scheme, compared with the prior art, the utility model has the following advantages: the utility model discloses direct methanol fuel cell piles when the equipment, sets up the runner short-term test positive and negative of different trends through bipolar plate positive and negative two sides, and then passes locating lever and lower locating lever with bipolar plate smoothly for pile up the in-process in the installation and can ensure all around unanimous, got rid of the wrong mistake of dress and adorned the wrong mistake, reduce the battery and pile up fault probability, improve the yields, and simple structure.

Drawings

FIG. 1 is a schematic diagram of an anode surface of a bipolar plate provided by the present invention;

FIG. 2 is a schematic view of the cathode side of a bipolar plate;

FIG. 3 is a schematic perspective view of a cell stack;

FIG. 4 is a schematic cross-sectional view of a cell stack;

wherein, 1, the bipolar plate; 11. a first input/output port for the solution; 12. a first gas input/output port; 13. a second input/output port for the solution; 14. a second gas input/output port; 15. an upper positioning hole; 16. a lower positioning hole; 17. positioning a groove; 2. an anode face; 21. an anode flow channel; 3. a cathode face; 31. a cathode flow channel; 4. an upper positioning rod; 5. a lower positioning rod; 6. and (5) fixing the rod.

Detailed Description

The upper, lower, left and right directions of the utility model are based on the direction in the attached figure 1.

The utility model provides a direct methanol fuel cell stack, which comprises a cell stack body and end plates arranged at the two ends of the cell stack body, and is shown in figures 3-4.

The cell stack body comprises a plurality of bipolar plates 1, and a proton exchange membrane is arranged between every two bipolar plates 1. As shown in fig. 1-2, two sides of each bipolar plate are respectively an anode surface 2 with an anode flow channel 21 and a cathode surface 3 with a cathode flow channel 31, two opposite surfaces of two adjacent bipolar plates 1 are different, the upper end of the bipolar plate 1 is provided with a solution first input/output port 11 and a gas first input/output port 12 which are parallel to each other left and right, the lower end of the bipolar plate is provided with a solution second input/output port 13 and a gas second input/output port 14 which are parallel to each other left and right, two ends of the anode flow channel 21 are respectively communicated with the solution first input/output port 11 and the solution second input/output port 13, two ends of the cathode flow channel 31 are respectively communicated with the gas first input/output port 12 and the gas second input/output port 14, the upper and lower ends of the bipolar plate 1 are respectively provided with an upper positioning hole 15 and a lower positioning hole 16, the upper positioning hole 15 is positioned between the solution first input/output port 11 and the gas first input/output port 12, the lower positioning hole 16 is located between the second solution input/output port 13 and the second gas input/output port 14, the left side of the bipolar plate 1 has an odd number of positioning slots 17, the right side of the bipolar plate 1 has an even number of positioning slots 17, the anode flow channel 21 extends along the upper and lower serpentine routing directions, the cathode flow channel 31 extends along the left and right serpentine routing directions, in this embodiment, the methanol solution enters the anode flow channel 21 from the first solution input/output port 11, after fully fusing and reacting with the catalyst in the anode flow channel 21, hydrogen ions are generated, the hydrogen ions are uniformly input to the proton exchange membrane, the carbon dioxide generated in the anode flow channel 21 is discharged from the second solution input/output port 13 along with the excess moisture, oxygen is input into the cathode flow channel 31 from the first gas input/output port 12, and fully reacts with the hydrogen ions in the cathode flow channel 31, and the generated water is output from the second gas input/output port 14, the flow of electrons generated during the reaction causes the cathode and anode to generate a voltage, thereby generating electrical energy.

As shown in fig. 1-2, the direct methanol fuel cell stack further includes two upper positioning rods 4 and two lower positioning rods 5 respectively inserted into the upper positioning holes 15 and the lower positioning holes 16, and a plurality of fixing rods 6 respectively located at the left and right sides of the bipolar plate 1 and engaged with the positioning grooves 17, wherein the upper positioning rods 4, the lower positioning rods 5 and the plurality of fixing rods 6 are respectively fixed between the two end plates.

The utility model discloses direct methanol fuel cell piles when the equipment, sets up the runner short-term test positive and negative of different trends through bipolar plate positive and negative two sides, and then passes locating lever 4 and locating lever 5 down with bipolar plate smoothly for pile up the in-process in the installation and can ensure the front-back unanimity, got rid of the mistake of dress and adorned the wrong mistake of turning over, reduce the battery and pile up fault probability, improve the yields, and simple structure.

In this embodiment, the bipolar plates 1 have two types, one type of bipolar plate 1 continues to extend upwards from the upper edge to form an upper fin, as shown in fig. 1 and 2, the other type of bipolar plate 1 continues to extend downwards from the lower edge to form a lower fin, and the two types of bipolar plates 1 are stacked at intervals to form a stack body convenient for heat dissipation, so that the stack can efficiently dissipate heat without additionally providing a cooling system or a heat dissipation device, and the bipolar plate structure is simple and has an obvious effect.

As shown in fig. 1-2, the solution first input/output port 11 and the solution second input/output port 13, the gas first input/output port 12 and the gas second input/output port 14 are rectangular holes penetrating through the anode surface 2 and the cathode surface 3, respectively, the input/output ports are large, it is ensured that the delivery ports of the methanol solution and the air are unblocked, it is ensured that the reaction is more sufficient, the battery capacity is increased, the anode runner 21 and the cathode runner 31 are both a plurality of serpentine runners, the reaction is complete, and the solution and the gas can be uniformly distributed, the reaction is stable, the output is stable, the anode runner 21 has 3 to 5 runners, the width of the runner ports is smaller than the size of the input/output ports, the length of the anode runner 21 is increased, and the cathode runner 31 has 22 to 26 runners, the length of the cathode runner 31 is relatively short, the ventilation volume is large, so that the methanol solution and the catalyst have enough space to fully fuse, and promote the reaction, the battery capacity is improved, the input gas is more increased and tighter, the reaction is more sufficient, and the waste of methanol solution is reduced.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. A direct methanol fuel cell stack, includes the cell stack body, sets up in the end plate of cell stack body both ends, the cell stack body includes a plurality of bipolar plates (1), every bipolar plate two sides is anode face (2) that have anode runner (21) and negative pole face (3) that have negative pole runner (31) respectively, its characterized in that: a first solution input and output port (11) and a first gas input and output port (12) which are arranged in parallel from left to right are arranged at the upper end part of the bipolar plate (1), a second solution input and output port (13) and a second gas input and output port (14) which are arranged in parallel from left to right are arranged at the lower end part of the bipolar plate, two ends of the anode flow channel (21) are respectively communicated with the first solution input and output port (11) and the second solution input and output port (13), two ends of the cathode flow channel (31) are respectively communicated with the first gas input and output port (12) and the second gas input and output port (14), the upper end part and the lower end part of the bipolar plate (1) are respectively provided with an upper positioning hole (15) and a lower positioning hole (16), the upper positioning hole (15) is positioned between the first solution input and output port (11) and the first gas input and output port (12), the lower positioning holes (16) are positioned between the second solution input and output port (13) and the second gas input and output port (14), positioning grooves (17) are respectively arranged at the left side and the right side of the bipolar plate (1), the positioning grooves (17) at the left side and the right side of the bipolar plate (1) are different in number and/or staggered up and down, the anode flow channel (21) extends along the upper and lower snake-shaped routing direction, the cathode flow channel (31) extends along the left and right snake-shaped routing direction,

the direct methanol fuel cell stack further comprises an upper positioning rod (4) and a lower positioning rod (5) which are inserted into the upper positioning hole (15) and the lower positioning hole (16) respectively, and a plurality of fixing rods (6) which are located on the left side and the right side of the bipolar plate (1) respectively and are in inserted fit with the positioning grooves (17), wherein the upper positioning rod (4), the lower positioning rod (5) and the plurality of fixing rods (6) are fixed between the two end plates respectively.

2. The direct methanol fuel cell stack of claim 1 wherein: the bipolar plate (1) has two types, one type of bipolar plate (1) extends upwards continuously from the upper edge part to form an upper fin, and the other type of bipolar plate (1) extends downwards continuously from the lower edge part to form a lower fin.

3. The direct methanol fuel cell stack of claim 1 wherein: the left side of the bipolar plate (1) is provided with an odd number of positioning grooves (17), and the right side of the bipolar plate (1) is provided with an even number of positioning grooves (17).

4. The direct methanol fuel cell stack of claim 2 wherein: the two bipolar plates (1) are arranged at intervals and stacked to form the cell stack body convenient for heat dissipation.

5. The direct methanol fuel cell stack of claim 4 wherein: the first solution input and output port (11), the second solution input and output port (13), the first gas input and output port (12) and the second gas input and output port (14) are rectangular holes penetrating through the anode surface (2) and the cathode surface (3) respectively.

6. The direct methanol fuel cell stack of claim 4 wherein: the anode flow channel (21) and the cathode flow channel (31) are both a plurality of serpentine flow channels, the number of the anode flow channels (21) is 3-5, and the number of the cathode flow channels (31) is 22-26.