Bipolar plate of fuel cell

Abstract

The utility model relates to the technical field of fuel cells, in particular to a bipolar plate of a fuel cell, which comprises a polar plate, the polar plate comprises a cathode plate, an anode plate and a plurality of bipolar plates, the bipolar plates are positioned between the cathode plate and the anode plate, and membrane electrode assemblies are arranged among the cathode plate, the anode plate and the bipolar plates. And the membrane electrode assembly and the polar plate are sealed through a sealing assembly. According to the utility model, through the arrangement of the sealing assembly, on the premise that the membrane electrode assembly is clamped by the polar plate, the sealant is injected into the polar plate from the top surface of the polar plate through the communicating hole, the sealant flows to the sealing groove through the communicating hole, the sealant flows in the sealing groove, and the flowing condition of the sealant is observed through the observation hole; compared with a traditional smearing mode for sealing, the sealing adhesive tape is thinner, and the thickness of the cell stack can be further reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to fuel cell technical field, concretely is fuel cell bipolar plate. BACKGROUND

[0002] The electric pile of fuel cell is stacked by a plurality of single cells, and the connection between the cells is directly completed by the polar plate, in addition to the polar plate at the both ends of the cell stack, one side of the polar plate in the middle is an anode, and the other side is a cathode, so it is called bipolar plate. The bipolar plate also plays a role of isolation between the cells.

[0003] In order to prevent the working gas and the cooling liquid from leaking, a sealing assembly needs to be arranged between the stacked parts, and a sealing gasket is usually used, which is generally made of rubber sheet and can increase the thickness of the cell. In the prior art, sealing glue is also used to bond the stacked parts to seal, thereby reducing the thickness of the cell stack. However, when the sealing glue is used, the sealing glue still has a certain thickness, so that the volume of the cell stack still has room for reduction. UTILITY MODEL CONTENT

[0004] In order to make up for the above shortcomings, the utility model provides a fuel cell bipolar plate.

[0005] The technical scheme of the utility model is:

[0006] The fuel cell bipolar plate comprises:

[0007] The polar plate comprises a cathode plate, an anode plate and a plurality of bipolar plates, the bipolar plates are located between the cathode plate and the anode plate, a membrane electrode assembly is arranged between the cathode plate, the anode plate and the bipolar plates, and the membrane electrode assembly and the polar plate are sealed by a sealing assembly.

[0008] The sealing assembly comprises a sealing flow channel, sealing glue is arranged in the sealing flow channel, and the sealing flow channel is located on the side of the cathode plate, the anode plate and the bipolar plate facing the membrane electrode assembly and extends into the interior of the polar plate and then penetrates the upper and lower end faces.

[0009] Preferably, working gas passage holes and cooling liquid passage holes are horizontally arranged in the top and bottom of the cathode plate, the anode plate and the bipolar plates, and the working gas passage holes are connected by a gas flow channel.

[0010] Preferably, the bipolar plate comprises a cathode part and an anode part, the cathode part faces the anode plate, and the anode part faces the cathode plate.

[0011] Preferably, the back surface of the cathode part and the back surface of the anode part are provided with cooling grooves, the cooling grooves are communicated with the cooling liquid passage holes, and the back surface of the cathode part and the back surface of the anode part are fixedly connected.

[0012] Preferably, the sealing flow channel comprises a sealing groove, which is located on the side of the cathode plate, the anode plate and the bipolar plate facing the membrane electrode assembly, and the back of the cathode part and the anode part are both provided with the sealing groove.

[0013] Preferably, the top and the bottom of the sealing groove are connected with a communication hole, which extends to the inside of the polar plate, and the communication hole on the bipolar plate penetrates the cathode part and the anode part from front to back.

[0014] Preferably, the middle part of the upper communication hole and the inside of the polar plate are connected with a glue injection port, and the middle part of the lower communication hole and the inside of the polar plate are provided with an observation hole, the glue injection port penetrates the polar plate upwardly, and the observation hole penetrates the polar plate downwardly.

[0015] The sealing assembly (5) comprises a sealing flow channel, the sealing flow channel is provided with sealing glue (55), the sealing flow channel is located on the side of the cathode plate (41), the anode plate (42) and the bipolar plate (43) facing the membrane electrode assembly (6) and extends into the inside of the polar plate (4) and then penetrates the upper and lower end faces.

[0016] Compared with the prior art, the utility model has the advantages that:

[0017] The utility model discloses a sealing assembly is set up, and under the premise that the polar plate clamps the membrane electrode assembly, the sealing glue is injected from the polar plate top surface to the inside of the polar plate through the communication hole, the sealing glue flows to the sealing groove through the communication hole, the sealing glue flows in the sealing groove, and the flow condition of the sealing glue is observed through the observation hole, when the sealing glue flows out from the observation hole, the sealing glue covers the sealing groove, realizes the sealing, and compared with the traditional daubing mode sealing, the thickness is thinner, and the battery stack thickness can be further reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is whole structure schematic diagram of the utility model;

[0019] Figure 2 It is end plate structure schematic diagram in the utility model;

[0020] Figure 3 It is polar plate structure schematic diagram in the utility model;

[0021] Figure 4 It is bipolar plate structure schematic diagram in the utility model;

[0022] Figure 5 It is sealing assembly structure schematic diagram in the utility model.

[0023] The meaning of each reference numeral in the drawing is as follows:

[0024] 1, end plate;11, plate body;12, first through hole;

[0025] 2, insulating plate;

[0026] 3. current collector plate;

[0027] 4. polar plate; 41. cathode plate; 42. anode plate; 43. bipolar plate; 431. cathode part; 432. anode part; 433. cooling groove; 44. air passage hole; 45. fuel gas passage hole; 46. coolant passage hole; 47. gas flow channel;

[0028] 5. sealing assembly; 51. sealing groove; 52. glue injection hole; 53. observation hole; 54. communication hole; 55. sealing glue;

[0029] 6. membrane electrode assembly. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely in the description of the present application combined with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0031] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0032] Embodiment 1:

[0033] Please refer to Figures 1-5 The above technical solutions are described in detail by the following embodiments of the present application:

[0034] The fuel cell bipolar plate comprises:

[0035] The polar plate 4 comprises a cathode plate 41, an anode plate 42 and a plurality of bipolar plates 43, the bipolar plates 43 are located between the cathode plate 41 and the anode plate 42, the membrane electrode assembly 6 is arranged between the cathode plate 41, the anode plate 42 and the bipolar plate 43, and the membrane electrode assembly 6 and the polar plate 4 are sealed by the sealing assembly 5.

[0036] The current collector plate 3 is arranged on both sides of the polar plate 4, and the current collector plate 3 is used for collecting the current of the polar plate 4.

[0037] The collector plate 3 is provided with an insulating plate 2 made of rubber or other insulating material on the outer side, and an end plate 1 is provided on the outer side of the insulating plate 2 for fixing and clamping the polar plate 4 and the collector plate 3.

[0038] The end plate 1 comprises a plate body 11, and a plurality of first through holes 12 are provided through the plate body 11 for connecting the delivery and output pipes of the working gas and the cooling liquid.

[0039] The cathode plate 41, the anode plate 42 and the bipolar plate 43 are provided with working gas passage holes and cooling liquid passage holes 46 through the top and bottom.

[0040] The working gas passage holes comprise air passage holes 44 for air flow and gas passage holes 45 for hydrogen flow.

[0041] The gas flow channels 47 on the cathode plate 41 are connected to the air passage holes 44. The gas flow channels 47 on the anode plate 42 are connected to the gas passage holes 45.

[0042] The bipolar plate 43 comprises a cathode part 431 and an anode part 432, the cathode part 431 facing the anode plate 42, and the anode part 432 facing the cathode plate 41.

[0043] The anode part 432 and the cathode part 431 are provided with gas flow channels 47 on the front surface, the gas flow channels 47 of the anode part 432 being connected to the gas passage holes 45. The gas flow channels 47 of the cathode part 431 are connected to the air passage holes 44.

[0044] The back surface of the cathode part 431 and the back surface of the anode part 432 are provided with cooling grooves 433 connected to the cooling liquid passage holes 46, and the back surface of the cathode part 431 and the back surface of the anode part 432 are fixedly connected.

[0045] The cooling grooves 433 are used for cooling liquid flow to cool the bipolar plate 43.

[0046] The sealing assembly 5 comprises a sealing flow channel, and a sealing glue 55 is arranged in the sealing flow channel. The sealing flow channel is located on the side of the cathode plate 41, the anode plate 42 and the bipolar plate 43 facing the membrane electrode assembly 6 and extends into the interior of the polar plate 4 and then penetrates through the upper and lower end surfaces.

[0047] The sealing glue 55 is a publicly known acidic insulating sealing glue.

[0048] The sealing flow channel comprises a sealing groove 51, and the sealing groove 51 is arranged on the side of the cathode plate 41, the anode plate 42 and the bipolar plate 43 facing the membrane electrode assembly 6. The back surface of the cathode part 431 and the back surface of the anode part 432 are both provided with the sealing groove 51.

[0049] The sealing groove 51 surrounds the outside of the gas flow channel 47, the working gas passage hole, the cooling liquid passage hole 46 and the cooling groove 433.

[0050] The top and bottom of the sealing groove 51 are connected with the communication holes 54 extending to the inside of the polar plate 4, and the communication holes 54 on the bipolar plate 43 penetrate the cathode part 431 and the anode part 432.

[0051] The middle part of the upper communication hole 54 and inside the polar plate 4 is connected with the glue injection port 52, and the middle part of the lower communication hole 54 and inside the polar plate 4 is provided with the observation hole 53, the glue injection port 52 penetrates the polar plate 4 upwards, and the observation hole 53 penetrates the polar plate 4 downwards.

[0052] The glue injection port 52 is used for injecting the sealing glue 55, after the sealing glue 55 is injected, the sealing glue 55 enters the sealing groove 51 through the communication hole 54, and under the premise that the polar plate 4 tightens the membrane electrode assembly 6, the sealing glue 55 flows along the sealing groove 51. When the sealing glue 55 flows out of the observation hole 53, the sealing glue 55 has filled the sealing groove 51, and the sealing of the polar plate 4 is realized.

[0053] The operator of the embodiment assembles the battery according to the order of the end plate 1, the insulating plate 2, the current collecting plate 3, the cathode plate 41, the membrane electrode assembly 6, the bipolar plate 43, the membrane electrode assembly 6, the anode plate 42, the current collecting plate 3, the insulating plate 2 and the end plate 1 when using the device, and fixes by using the bolt.

[0054] The bipolar plate 43 can be multiple, and the membrane electrode assembly 6 is used to separate adjacent bipolar plates 43, and it should be noted that the cathode part 431 of the bipolar plate 43 faces the anode plate 42, and the anode part 432 of the bipolar plate 43 faces the cathode plate 41.

[0055] After the assembly is completed, the sealing glue 55 is injected from the glue injection port 52, and after the sealing glue 55 is injected, the sealing glue 55 enters the sealing groove 51 through the communication hole 54, and under the premise that the polar plate 4 tightens the membrane electrode assembly 6, the sealing glue 55 flows along the sealing groove 51. When the sealing glue 55 flows out of the observation hole 53, the sealing glue 55 has filled the sealing groove 51, and the sealing of the polar plate 4 is realized.

[0056] The basic principle, main features and advantages of the utility model are shown and described above. It should be understood by the person skilled in the art that the utility model is not limited by the above-mentioned embodiments, and the above-mentioned embodiments and the description in the specification are only preferred examples of the utility model and are not used to limit the utility model, and various changes and improvements of the utility model can be made without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed. The protection scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A fuel cell bipolar plate, characterized by, It includes: The polar plate (4) includes a cathode plate (41), an anode plate (42) and a plurality of bipolar plates (43), the bipolar plates (43) are located between the cathode plate (41) and the anode plate (42), and the cathode plate (41), the anode plate (42) and the bipolar plate (43) are provided with a membrane electrode assembly (6), and the membrane electrode assembly (6) and the polar plate (4) are sealed by a sealing assembly (5); The sealing assembly (5) includes a sealing flow channel, the sealing flow channel is provided with a sealing glue (55), and the sealing flow channel is located on the side of the cathode plate (41), the anode plate (42) and the bipolar plate (43) towards the membrane electrode assembly (6) and extends into the inside of the polar plate (4) and then penetrates the upper and lower end faces.

2. The fuel cell bipolar plate of claim 1, wherein: The top and bottom of the cathode plate (41), the anode plate (42) and the bipolar plate (43) are provided with working gas passage holes and cooling liquid passage holes (46), and the working gas passage holes are communicated by a gas flow channel (47).

3. The fuel cell bipolar plate of claim 2, wherein: The bipolar plate (43) includes a cathode part (431) and an anode part (432), the cathode part (431) faces the anode plate (42), and the anode part (432) faces the cathode plate (41).

4. The fuel cell bipolar plate of claim 3, wherein: The back surface of the cathode part (431) and the back surface of the anode part (432) are provided with cooling grooves (433), the cooling grooves (433) are communicated with the cooling liquid passage holes (46), and the back surface of the cathode part (431) and the back surface of the anode part (432) are fixedly connected.

5. The fuel cell bipolar plate of claim 4, wherein: The sealing flow channel includes a sealing groove (51), the sealing groove (51) is located on the side of the cathode plate (41), the anode plate (42) and the bipolar plate (43) towards the membrane electrode assembly (6), and the back surface of the cathode part (431) and the back surface of the anode part (432) are provided with the sealing groove (51).

6. The fuel cell bipolar plate of claim 5, wherein: The top and bottom of the sealing groove (51) are connected with communication holes (54), the communication holes (54) extend into the inside of the polar plate (4), and the communication holes (54) on the bipolar plate (43) penetrate the cathode part (431) and the anode part (432) from front to back.

7. The fuel cell bipolar plate of claim 6, wherein: The middle part of the upper communication hole (54) and the inside of the polar plate (4) are connected with a glue injection port (52), the middle part of the lower communication hole (54) and the inside of the polar plate (4) are provided with an observation hole (53), the glue injection port (52) penetrates the polar plate (4) upwards, and the observation hole (53) penetrates the polar plate (4) downwards.

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