Fuel cell bipolar plate and fuel cell

Abstract

The utility model belongs to the technical field of fuel cells, and particularly relates to a fuel cell bipolar plate and a fuel cell, the fuel cell bipolar plate is characterized in that an air inlet and an air outlet which are used for air inlet and air outlet are arranged on a bipolar plate body in a penetrating manner, and an air guide area communicated with the air inlet and the air outlet is arranged on the bipolar plate body; a plurality of spine columns are arranged in the air guide area side by side, an air circulation channel used for air circulation is formed between every two adjacent spine columns, the bottom end of each air circulation channel is provided with an elastic blocking piece used for on-off adjustment, one end of each elastic blocking piece is connected to the inner wall of one spine column in an inserted mode, and the other end of each elastic blocking piece is connected to the inner wall of the other spine column in an inserted mode. According to the bipolar plate, the adjusting piece is additionally arranged at the bottom end of the gas circulation channel, so that the gas circulation channel is elastically blocked, and when the plurality of gas circulation channels are not fully filled, gas cannot be discharged through the gas outlet, and the gas can be uniformly distributed at each position of the bipolar plate.

Description

Technical Field

[0001] This utility model belongs to the field of fuel cell technology, specifically relating to a fuel cell bipolar plate and a fuel cell. Background Technology

[0002] A fuel cell consists of a membrane electrode assembly, bipolar plates, current collectors, gaskets, etc., and includes a bipolar plate anode-side sealing ring, anode metal plate, cathode metal plate, weld seam, and cathode-side sealing ring.

[0003] Bipolar plates, as key components in electronic devices, are of paramount importance in both their composition and function. They primarily consist of three layers: a metal layer, an insulating layer, and an oxide layer. The metal layer, typically made of copper, aluminum, or stainless steel, ensures excellent electrical and thermal conductivity. The insulating layer serves as an insulating barrier between the electrodes, effectively preventing short circuits. The oxide layer enhances the bipolar plate's corrosion resistance and improves its stability.

[0004] To improve the uniformity of gas flow, existing bipolar plates have multiple gas flow channels arranged in parallel on the plate. This allows the gas to be evenly distributed across the bipolar plate. However, because there are multiple gas flow channels, when gas passes through one channel, pressure will form in the other channels, causing them to become blocked and unable to flow, thus affecting the uniformity of gas distribution. Utility Model Content

[0005] The purpose of this invention is to provide a fuel cell bipolar plate and a fuel cell to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a fuel cell bipolar plate, comprising: two air inlets and outlets for air intake and exhaust are provided through the bipolar plate body; the bipolar plate body is provided with a gas guiding area connecting the air inlets and outlets; multiple spines are arranged side by side in the gas guiding area; a gas flow channel for gas flow is formed between two adjacent spines; and an adjustment element for on / off adjustment is provided at the bottom end of each gas flow channel.

[0007] Preferably, the adjusting member includes an elastic baffle, and one end of the elastic baffle is inserted into the inner wall of one of the vertebrae.

[0008] Preferably, a slot and a groove are respectively provided on the opposite side of the bottom ends of two adjacent spines, one end of the elastic baffle is inserted into the groove, and one end of the elastic baffle abuts against the slot from the outside to the inside.

[0009] Preferably, the inner wall of the slot is further provided with a protrusion to limit the elastic baffle, and the elastic baffle is provided with a groove to accommodate the protrusion.

[0010] Preferably, multiple gas guide blocks are staggered on the inner walls on both sides of each gas flow channel, and each gas guide block has a semi-circular cross-section.

[0011] Preferably, the area of ​​the elastic baffle is larger than the cross-sectional area of ​​the gas flow channel.

[0012] Preferably, the upper and lower ends of the air guiding area are respectively provided with a first air guiding groove and a second air guiding groove, and the air inlet and air outlet are respectively connected to the first air guiding groove and the second air guiding groove.

[0013] This utility model also provides a fuel cell, which includes the fuel cell bipolar plate disclosed above, the bipolar plate body being disposed in the fuel cell.

[0014] Compared with the prior art, this utility model has the following advantages:

[0015] (1) By adding an adjustment component at the bottom of the gas flow channel, the gas flow channel is elastically blocked, so that when multiple gas flow channels are not filled, the gas will not be discharged through the outlet, which makes it easier to distribute the gas evenly at various positions of the bipolar plate.

[0016] (2) The present invention uses an added elastic baffle, which is elastically bent when the gas pressure in the gas flow channel is too high by the elastic force of the elastic baffle itself, so as to facilitate the opening and closing of the gas flow channel by the elastic baffle.

[0017] (3) The present invention improves the sealing degree of the elastic baffle for the gas flow channel by adding a slot and a groove. At the same time, the slot facilitates the replacement of the elastic baffle and makes maintenance easier. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a partial sectional view of the elastic baffle and spine of this utility model;

[0020] Figure 3 for Figure 1 Enlarged view of point A in the middle;

[0021] In the diagram: 1. Bipolar plate body; 2. Air inlet; 3. First air guide groove; 4. Gas flow channel; 5. Spine; 6. Second air guide groove; 7. Air outlet; 8. Slot; 9. Elastic baffle; 10. Slot; 11. Groove; 12. Protrusion; 13. Air guide block. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] refer to Figure 1 As shown, the present invention provides a fuel cell bipolar plate, comprising: a bipolar plate body 1 having two air inlets 2 and air outlets 7 through it for air intake and exhaust; a gas guiding area connecting the air inlets 2 and air outlets 7 on the bipolar plate body 1; a plurality of spines 5 arranged in parallel in the gas guiding area; a gas flow channel 4 for gas flow formed between two adjacent spines 5; and an adjustment element for on / off adjustment at the bottom end of each gas flow channel 4.

[0024] Combination Figure 1 As shown, the adjusting member includes an elastic baffle 9, and one end of the elastic baffle 9 is inserted into the inner wall of one of the spines 5.

[0025] Combination Figure 1 As shown, the upper and lower ends of the air guiding area are respectively provided with a first air guiding groove 3 and a second air guiding groove 6 that are connected. The air inlet 2 and the air outlet 7 are respectively connected to the first air guiding groove 3 and the second air guiding groove 6.

[0026] As described above, using the bipolar plate body 1, air inlet 2, air outlet 7, and multiple spines 5 provided by this utility model, the air guiding area is divided on the bipolar plate body 1 by the multiple spines 5, allowing the bipolar plate body 1 to simultaneously allow multi-channel gas passage. When gas enters one of the gas flow channels 4 through the first air guiding groove 3, the elastic baffle 9 limits it. At this time, the remaining gas enters the remaining gas flow channels 4 sequentially through the first air guiding groove 3. When the gas pressure in multiple gas flow channels 4 is greater than the elastic force of the elastic baffle 9, the elastic baffle... When plate 9 is away from the end of gas flow channel 4, the gas in gas flow channel 4 enters the second gas guide groove 6 and is discharged outward through the gas outlet 7. During this process, each gas flow channel 4 is filled with gas, so that the gas can be evenly distributed at different positions of the bipolar plate body 1. The first gas guide groove and the second gas guide groove are respectively installed horizontally at the ends of multiple gas flow channels, and the size of the first gas guide groove and the second gas guide groove is larger than the size of the cross-section of the gas flow channel, so that the gas can flow through the first gas guide groove and the second gas guide groove in multiple gas flow channels.

[0027] Furthermore, in order to increase the time the gas spends in gas flow channel 4, refer to Figure 1 As shown, multiple gas guide blocks 13 are staggered on the inner walls of both sides of each gas flow channel 4, and each gas guide block 13 has a semi-circular cross-section. When gas enters the staggered gas guide blocks 13, the staggered gas guide blocks 13 extend the length of the gas flow channel 4, increase the time the gas spends in the gas flow channel 4, increase the gas reaction time, increase the combustion efficiency of the fuel cell, and improve the energy utilization rate of the fuel cell.

[0028] In this utility model, combined with Figure 2-3 As shown, in this embodiment, the bottom ends of two adjacent spines 5 are respectively provided with a slot 8 and a slot 10. One end of the elastic baffle 9 is inserted into the slot 10, and the other end of the elastic baffle 9 abuts against the slot 8 from the outside to the inside.

[0029] Combination Figure 1 As shown, the area of ​​the elastic baffle 9 is larger than the cross-sectional area of ​​the gas flow channel 4.

[0030] As described above, using the slot 8 and slot 10 provided by this utility model, the elastic baffle 9 is detachably installed in the spine 5 through the slot 10. At this time, the elastic baffle 9 is set at the bottom end of the gas flow channel 4. The slot 8 improves the tightness of the contact between the elastic baffle 9 and the gas flow channel 4. When the elastic baffle 9 is not under force, the elastic baffle 9 abuts against the end of the gas flow channel 4. The elastic baffle 9 is tightly abutted against the end of the gas flow channel 4 by its own elasticity, avoiding leakage between the gas flow channel 4 and the elastic baffle 9. The insertion end of the elastic baffle 9 has a bent part for elastic bending. When the gas pressure in the gas flow channel 4 is too high, the elastic baffle 9 is elastically bent at the bent part, thereby opening the port of the gas flow channel 4 to facilitate the flow of gas. At the same time, since the size of the elastic baffle 9 is larger than the cross-sectional size of the gas flow channel 4, when the elastic baffle 9 is in the slot 8 and slot 10, the end of the gas flow channel 4 is blocked by the elastic baffle 9, which facilitates the flow of gas to other gas flow channels 4.

[0031] Furthermore, to facilitate the stable and detachable installation of the elastic baffle 9 in the slot 10, refer to... Figure 3As shown, the inner wall of the slot 10 is also provided with a protrusion 12 to limit the elastic baffle 9, and the elastic baffle 9 is provided with a groove 11 to accommodate the protrusion 12. When one end of the elastic baffle 9 is inserted into the slot 10, the protrusion 12 engages in the groove 11, thereby restricting one end of the elastic baffle 9 in the slot 10, preventing the elastic baffle 9 from falling out of the slot 10, improving the stability of the installation of the elastic baffle 9, and preventing the elastic baffle 9 from falling out of the slot 10 without external force. When the elastic baffle 9 needs to be replaced, the protrusion 12 is disengaged from the groove 11 to release the restriction on the elastic baffle 9, at which point the elastic baffle 9 can be replaced, ensuring that the elastic baffle 9 always maintains the airtightness of sealing the end of the gas flow channel 4 when not under force.

[0032] This invention also provides a fuel cell, which includes the fuel cell bipolar plate disclosed above, with the bipolar plate body 1 disposed in the fuel cell. The bipolar plate body 1 of this invention is applicable to different types of fuel cells, can replace the bipolar plates in existing fuel cells, and improves the energy conversion efficiency of the fuel cell.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fuel cell bipolar plate, characterized in that, include: Two air inlets (2) and outlets (7) for air intake and exhaust are provided through the bipolar plate body (1). The bipolar plate body (1) is provided with an air guiding area that connects the air inlets (2) and outlets (7). Multiple spines (5) are arranged side by side in the air guiding area. A gas flow channel (4) for gas flow is formed between two adjacent spines (5). Each gas flow channel (4) is provided with an adjustment element for on / off adjustment at its bottom end.

2. The fuel cell bipolar plate according to claim 1, characterized in that: The adjusting member includes an elastic baffle (9), one end of which is inserted into the inner wall of one of the spines (5).

3. A fuel cell bipolar plate according to claim 2, characterized in that: The bottom ends of two adjacent spines (5) are respectively provided with a slot (8) and a slot (10). One end of the elastic baffle (9) is inserted into the slot (10), and one end of the elastic baffle (9) abuts against the slot (8) from the outside to the inside.

4. A fuel cell bipolar plate according to claim 3, characterized in that: The inner wall of the slot (10) is also provided with a protrusion (12) for limiting the elastic baffle (9), and the elastic baffle (9) is provided with a groove (11) for accommodating the protrusion (12).

5. A fuel cell bipolar plate according to claim 1, characterized in that: Multiple gas guide blocks (13) are staggered on the inner walls on both sides of each gas flow channel (4), and each gas guide block (13) has a semi-circular cross-section.

6. A fuel cell bipolar plate according to claim 2, characterized in that: The area of ​​the elastic baffle (9) is larger than the cross-sectional area of ​​the gas flow channel (4).

7. A fuel cell bipolar plate according to claim 1, characterized in that: The upper and lower ends of the air guiding area are respectively provided with a first air guiding groove (3) and a second air guiding groove (6) that are connected. The air inlet (2) and the air outlet (7) are respectively connected to the first air guiding groove (3) and the second air guiding groove (6).

8. A fuel cell, characterized in that: It includes a fuel cell bipolar plate according to any one of claims 1-7, wherein the bipolar plate body (1) is disposed in the fuel cell.

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