Shunting port structure of composite bipolar plate of fuel cell

Abstract

The utility model discloses a shunting port structure of a composite bipolar plate of a fuel cell, which relates to the technical field of composite bipolar plates and comprises a cathode single plate, an anode single plate is adhered to the bottom of the cathode single plate, a first shunting groove is arranged on one side of the cathode single plate close to the anode single plate, and a second shunting groove is arranged on the other side of the cathode single plate close to the anode single plate. A plurality of groups of first shunting blocks are distributed in the first shunting groove in an array manner, a second shunting groove corresponding to the second shunting groove is formed in the side wall of the anode single plate, and a plurality of groups of second shunting blocks are distributed in the second shunting groove. According to the design scheme of the utility model, the first shunting groove is formed in the cathode single plate, so that the depth of the second shunting groove can be reduced, the wall thickness between the second shunting groove and the second glue groove is further increased, and a shunting opening is prevented from being collapsed when a glue strip is pressed; and the first shunting groove and the first shunting block are additionally arranged, so that the cross sectional area of the shunting opening is increased, the flow at the shunting opening is improved, and heat generated in the operation process of the composite graphite plate electric pile is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of composite bipolar plates, in particular to a flow diversion port structure of a composite bipolar plate for a fuel cell. Background Art

[0002] Fuel cells are a type of energy that has the advantages of low operating temperature, high specific power, and rapid startup, and have become one of the hot topics in the field of new energy research. The key components of fuel cells are membrane electrode (MEA) and bipolar plates. The bipolar plate assembly includes an anode flow field plate and a cathode flow field plate, which are combined and properly sealed between the cathode and anode plates to form a sealed cooling flow field. All operating fluids (such as fuel, oxidant, and coolant) will circulate in the cooling flow field under a certain pressure, so all features in the plate must be properly sealed, so they will be assembled and pressed after sealing.

[0003] As for the current existing molded composite graphite bipolar plates, since the existing composite graphite bipolar plates only have diverter ports on the anode plate, the wall thickness between the diverter ports of the anode plate and the glue groove is relatively thin. The compression process of the rubber strip will collapse part of the diverter ports, resulting in a decrease in the flow rate at the diverter ports, affecting the normal power generation of the fuel cell. In addition, the cross-sectional area of ​​the original diverter ports is relatively small, and the composite graphite plate stack will generate higher heat during operation. Utility Model Content

[0004] In order to overcome the above-mentioned defects existing in the prior art, the utility model provides a fuel cell composite bipolar plate diverter structure.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a fuel cell composite bipolar plate diverter structure, including a cathode single plate, an anode single plate bonded to the bottom of the cathode single plate, a first diverter groove is provided on the side of the cathode single plate close to the anode single plate, the first diverter groove is located on the side of the operating fluid channel, a plurality of groups of first diverter blocks are arranged in an array in the first diverter groove, a second diverter groove corresponding to the second diverter groove is provided on the side wall of the anode single plate, and a plurality of groups of second diverter blocks are arranged in an array in the second diverter groove.

[0006] Furthermore, the first diverter block and the second diverter block are both waist-shaped structures, the spacing between each group of the second diverter blocks is equal to the width of a single group of second diverter blocks, the width of the first diverter block is equal to the width of three groups of second diverter blocks, and the spacing between the first diverter blocks is equal to the spacing between the second diverter blocks.

[0007] Furthermore, a first glue groove is provided on a side of the anode single plate close to the cathode single plate, the first glue groove is wrapped around the periphery of the second shunt groove, and the first glue groove is filled with adhesive.

[0008] Furthermore, a second glue groove is provided on the side of the anode plate away from the cathode plate, and the second glue groove is wrapped around the periphery of the operating fluid channel. A third glue groove corresponding to the second glue groove is provided on the side of the cathode plate away from the anode plate.

[0009] Furthermore, the second glue groove and the third glue groove are respectively filled with air path glue.

[0010] The beneficial effect of the utility model is that the design of the utility model can reduce the depth of the second diverter groove by opening the first diverter groove on the cathode single plate, thereby increasing the wall thickness between the second diverter groove and the second rubber groove, avoiding the diverter port from collapsing when the rubber strip is under pressure, and the additional first diverter groove and the first diverter block increase the cross-sectional area of ​​the diverter port, increase the flow rate at the diverter port, and effectively reduce the heat generated by the composite graphite plate stack during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0012] Figure 1 It is a schematic diagram of the structure of a cathode single plate in the prior art;

[0013] Figure 2 It is a structural schematic diagram of the flow diversion port of the composite graphite bipolar plate in the prior art;

[0014] Figure 3 The explosion of the utility model Figure 1 ;

[0015] Figure 4 The explosion of the utility model Figure 2 ;

[0016] Figure 5 This is a schematic diagram of the structure of the cathode single plate of the utility model;

[0017] Figure 6 This is a schematic diagram of the structure of the anode single plate of the utility model;

[0018] Figure 7 A top view of the utility model;

[0019] Figure 8 for Figure 7 Schematic diagram of the cross-sectional structure along the AA direction.

[0020] In the figure: 1. cathode single plate, 11. first shunt groove, 12. first shunt block, 13. third glue groove, 2. anode single plate, 21. second shunt groove, 22. second shunt block, 23. first glue groove, 24. second glue groove, 3. adhesive glue, 4. air path glue, 5. operating fluid channel, 1'. cathode single plate of the prior art, 2'. anode single plate of the prior art. DETAILED DESCRIPTION

[0021] In order to more clearly illustrate the technical solution of the utility model, the utility model is further described below in conjunction with the accompanying drawings. Obviously, the accompanying drawings described below are only one embodiment of the utility model. For ordinary technicians in this field, without paying any creative work, other embodiments can be obtained based on this drawing and embodiment, which all belong to the protection scope of the utility model.

[0022] according to Figure 1-8 As shown, a fuel cell composite bipolar plate diverter structure includes a cathode single plate 1, an anode single plate 2 is bonded to the bottom of the cathode single plate 1, a first diverter groove 11 is provided on the side of the cathode single plate 1 close to the anode single plate 2, the first diverter groove 11 is located on the side of the operating fluid channel 5, a plurality of groups of first diverter blocks 12 are arranged in an array in the first diverter groove 11, a second diverter groove 21 corresponding to the second diverter groove 21 is provided on the side wall of the anode single plate 2, and a plurality of groups of second diverter blocks 22 are arranged in an array in the second diverter groove 21.

[0023] In this embodiment, according to Figure 8 As shown, the first shunt block 12 and the second shunt block 22 are both waist-shaped structures, the spacing between each group of second shunt blocks 22 is equal to the width of a single group of second shunt blocks 22, the width of the first shunt block 12 is equal to the width of three groups of second shunt blocks 22, the spacing between the first shunt blocks 12 is equal to the spacing between the second shunt blocks 22, and when the cathode single plate 1 and the anode single plate 2 are bonded together, the first shunt block 12 is in close contact with the second shunt block 22, and the gap between the first shunt block 12 and the second shunt block 22 forms a shunt port.

[0024] In this embodiment, according to Figure 3-6 As shown, a first glue groove 23 is opened on one side of the anode plate 2 close to the cathode plate 1 , and the first glue groove 23 is wrapped around the periphery of the second diverter groove 21 . The first glue groove 23 is filled with adhesive 3 , and the anode plate 2 and the cathode plate 1 are bonded together by the adhesive 3 .

[0025] In this embodiment, according to Figure 3-6 As shown, a second glue groove 24 is opened on the side of the anode plate 2 away from the cathode plate 1, and the second glue groove 24 is wrapped around the periphery of the operating fluid channel 5. A third glue groove 13 corresponding to the second glue groove 24 is opened on the side of the cathode plate 1 away from the anode plate 2.

[0026] In this embodiment, according to Figure 3-6 As shown, the second glue groove 24 and the third glue groove 13 are respectively filled with gas path glue 4. When the composite bipolar plates are stacked and assembled, the gas path glue 4 is used to seal the operating fluid flowing between the composite bipolar plates to prevent leakage.

[0027] During the assembly and press-assembly of the utility model, the adhesive 3 is applied to the third adhesive groove 13, and then the cathode single plate 1 is aligned with the anode single plate 2, and the first shunt groove 11 is aligned with the second shunt groove 21, the first shunt block 12 is in close contact with the second shunt block 22, and the gap between the first shunt block 12 and the second shunt block 22 forms a shunt port. Since the first shunt groove 11 is added to the cathode single plate 1, the depth of the second shunt groove 21 can be reduced, thereby increasing the wall thickness between the second shunt groove 21 and the second adhesive groove 21, and preventing the shunt port from being collapsed during the process of the rubber strip being compressed. In addition, the added first shunt groove 11 and the first shunt block 12 increase the cross-sectional area of ​​the shunt port, increase the flow rate at the shunt port, and effectively reduce the heat generated by the composite graphite plate stack during operation.

[0028] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A fuel cell composite bipolar plate shunt port structure, comprising a cathode plate (1), an anode plate (2) bonded to the bottom of the cathode plate (1), characterized in that: A first shunt groove (11) is provided on a side of the cathode single plate (1) close to the anode single plate (2), the first shunt groove (11) is located on the side of the operating fluid channel (5), a plurality of groups of first shunt blocks (12) are arranged in an array in the first shunt groove (11), a second shunt groove (21) corresponding to the second shunt groove (21) is provided on the side wall of the anode single plate (2), a plurality of groups of second shunt blocks (22) are arranged in an array in the second shunt groove (21).

2. A fuel cell composite bipolar plate manifold structure according to claim 1, characterized in that: The first flow diverter block (12) and the second flow diverter block (22) are both waist-shaped structures, the spacing between each group of the second flow diverter blocks (22) is equal to the width of a single group of second flow diverter blocks (22), the width of the first flow diverter block (12) is equal to the width of three groups of second flow diverter blocks (22), and the spacing between the first flow diverter blocks (12) is equal to the spacing between the second flow diverter blocks (22).

3. A fuel cell composite bipolar plate manifold structure according to claim 2, characterized in that: A first glue groove (23) is provided on a side of the anode single plate (2) close to the cathode single plate (1), the first glue groove (23) wraps around the periphery of the second shunt groove (21), and the first glue groove (23) is filled with adhesive glue (3).

4. A fuel cell composite bipolar plate manifold structure according to claim 1, characterized in that: A second glue groove (24) is provided on the side of the anode single plate (2) away from the cathode single plate (1), and the second glue groove (24) is wrapped around the periphery of the operating fluid channel (5); and a third glue groove (13) corresponding to the second glue groove (24) is provided on the side of the cathode single plate (1) away from the anode single plate (2).

5. A fuel cell composite bipolar plate manifold structure according to claim 4, characterized in that: The second glue groove (24) and the third glue groove (13) are respectively filled with air path glue (4).

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