Fuel cell composite bipolar plate adhesive groove overflow groove

Abstract

The utility model belongs to fuel cell technical field, concretely is a kind of fuel cell composite bipolar plate adhesive groove overflow glue groove, including the anode plate and cathode plate of relatively sealed superposition, the anode plate and cathode plate, the outer periphery of hydrogen gas inlet and outlet, oxygen gas inlet and outlet and cooling liquid inlet and outlet and the outer periphery of hydrogen gas flow field and oxygen gas flow field are equipped with the sealing groove recessed to board inside, the edge of cathode plate and anode plate is also equipped with overflow glue groove, the overflow glue groove is inclined state with sealing groove in horizontal direction, one end of overflow glue groove is communicated with sealing groove, and the other end extends to the edge of bipolar plate, the groove depth of overflow glue groove gradually becomes smaller from the connecting place with sealing groove to the edge of bipolar plate, in the utility model, overflow glue groove is arranged at the edge of bipolar plate, when dispensing too much, sealing glue flows out through overflow glue groove, so that sealing glue can not flow to board surface, the flatness of board surface is guaranteed, and it is favorable to the sealing of bipolar plate.

Description

Technical Field

[0001] This utility model relates to the field of fuel cell technology, specifically to an overflow groove for bonding adhesive in a fuel cell composite bipolar plate. Background Technology

[0002] In fuel cell systems, bipolar plates bear the crucial responsibility of supporting the overall frame and ensuring the structural stability of the cell under various operating conditions. Sealing the bipolar plate assembly is a critical step in guaranteeing the performance and reliability of the fuel cell. Bipolar plate assemblies are prepared using adhesives capable of withstanding the fuel cell environment, typically epoxy resin adhesives, and are sealed and isolated from each required fluid cavity through screen printing, dispensing, or in-mold injection molding. While this sealant typically bonds strongly to metal and pure graphite bipolar plates, its adhesion to composite graphite plates is significantly reduced. Current technologies often achieve bipolar plate sealing by creating overflow channels on the bipolar plates and filling these channels with sealant. However, when filling the sealant using a dispensing machine, the sealant can easily flow onto the surface of the bipolar plates, thus affecting the sealing performance. Utility Model Content

[0003] In order to overcome the above-mentioned defects in the prior art, the present invention provides a fuel cell composite bipolar plate bonding adhesive overflow groove.

[0004] An adhesive overflow groove for a fuel cell composite bipolar plate includes an anode plate and a cathode plate that are sealed and stacked together. The anode plate and cathode plate have indented sealing grooves on the outer periphery of the hydrogen inlet / outlet, oxygen inlet / outlet, and coolant inlet / outlet, as well as on the outer periphery of the hydrogen flow field and oxygen flow field. The cathode plate and anode plate also have overflow grooves on their edges. The overflow grooves are inclined to the sealing grooves in the horizontal direction. One end of the overflow groove is connected to the sealing groove, and the other end extends to the edge of the bipolar plate. The depth of the overflow groove gradually decreases from the connection with the sealing groove to the edge of the bipolar plate.

[0005] Furthermore, the depth of the groove at the connection between the overflow groove and the sealing groove is equal to that of the sealing groove, with a depth of 0.1-0.3 mm.

[0006] Furthermore, the depth of the overflow groove at the edge of the bipolar plate is 0.02-0.05 mm.

[0007] Furthermore, several circular connecting grooves are distributed along the center line of the sealing groove, which are recessed into the plate with the groove wall of the sealing groove as the reference plane.

[0008] Furthermore, both ends of the overflow groove are provided with flared portions, the diameter of which is larger than the diameter of the middle part of the overflow groove.

[0009] Furthermore, the depth of the connecting groove is 0.02-0.05 mm.

[0010] Due to the adoption of the above technical solutions, the beneficial technical effects of this utility model are as follows: In this utility model, by filling the sealing groove with sealant, the anode plate and the cathode plate are bonded together, which is conducive to ensuring the sealing performance of the bipolar plate. In order to prevent the sealant from overflowing onto the surface of the bipolar plate during dispensing, an overflow groove is provided at the edge of the bipolar plate. When too much sealant is dispensed, the sealant flows out through the overflow groove, thereby preventing the sealant from flowing onto the plate surface, ensuring the flatness of the plate surface, and facilitating the sealing of the bipolar plate. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the installation structure of the adhesive overflow groove for the composite bipolar plate of a fuel cell according to this utility model.

[0012] Figure 2 This is a front view of the adhesive overflow groove for bonding composite bipolar plates in fuel cells according to this utility model.

[0013] Figure 3 This utility model Figure 2 A partial schematic diagram of the cross-sectional structure along the AA direction;

[0014] Figure 4 This utility model Figure 2 Enlarged schematic diagram of region B in the middle.

[0015] In the diagram: 1. Anode plate, 2. Cathode plate, 3. Hydrogen inlet / outlet, 4. Oxygen inlet / outlet, 5. Coolant inlet / outlet, 6. Sealing groove, 7. Glue overflow groove, 8. Connecting groove, 9. Flared section. Detailed Implementation

[0016] To more clearly illustrate the technical solution of this utility model, the following description is made in conjunction with the accompanying drawings. Obviously, the drawings described below are only one embodiment of this utility model. For those skilled in the art, other embodiments can be obtained based on these drawings and embodiments without creative effort, and all of them fall within the protection scope of this utility model.

[0017] according to Figure 1-4As shown, a fuel cell composite bipolar plate adhesive overflow groove 7 includes an anode plate 1 and a cathode plate 2 that are relatively sealed and stacked. The anode plate 1 and cathode plate 2 are provided with a sealing groove 6 that is recessed into the plate at the outer periphery of the hydrogen inlet / outlet 3, the oxygen inlet / outlet 4, and the coolant inlet / outlet 5, as well as at the outer periphery of the hydrogen flow field and the oxygen flow field. The cathode plate 2 and the anode plate 1 are also provided with an overflow groove 7 at their edges. The overflow groove 7 is inclined to the sealing groove 6 in the horizontal direction. One end of the overflow groove 7 is connected to the sealing groove 6, and the other end extends to the edge of the bipolar plate. The depth of the overflow groove 7 gradually decreases from the connection with the sealing groove 6 to the edge of the bipolar plate.

[0018] In the above specific technical solution, by filling the sealing groove 6 with sealant, the anode plate 1 and the cathode plate 2 are bonded together, which helps to ensure the sealing of the bipolar plate. To prevent the sealant from overflowing onto the surface of the bipolar plate during dispensing, an overflow groove 7 is provided at the edge of the bipolar plate. When too much sealant is dispensed, the sealant flows out through the overflow groove 7, thus preventing the sealant from flowing onto the plate surface, ensuring the flatness of the plate surface, and facilitating the sealing of the bipolar plate.

[0019] Specifically, the depth of the overflow groove 7 gradually decreases from the connection point with the sealing groove 6 to the edge of the bipolar plate, so that the overflow groove 7 can accommodate the sealant. The sealant will overflow when the height of the sealant reaches the depth of the overflow groove 7 at the edge of the bipolar plate. The overflow groove 7 is inclined to the sealing groove 6 on the horizontal plane, which helps to increase the length of the overflow groove 7, thereby increasing the amount of sealant that the overflow groove 7 can hold.

[0020] The design of the overflow groove 7 can increase the amount of sealant that the bipolar plate can hold. When there is too much sealant, the sealant can flow out from the side of the bipolar plate through the overflow groove 7, thereby preventing the sealant from overflowing onto the plate surface and affecting the sealing performance of the bipolar plate.

[0021] The depth of the groove at the connection between the overflow groove 7 and the sealing groove 6 is equal to that of the sealing groove 6, and the depth is 0.1-0.3mm.

[0022] The depth of the overflow groove 7 at the edge of the bipolar plate is 0.02-0.05 mm.

[0023] The sealing groove 6 has several circular connecting grooves 8 that are recessed into the plate with the groove wall of the sealing groove 6 as the reference plane.

[0024] The depth of the connecting groove 8 is 0.02-0.05mm.

[0025] In the above specific technical solution, the connection groove 8 is provided, which helps to increase the bonding area of ​​the sealant to the bipolar plate and increase the bonding strength of the sealant to the bipolar plate.

[0026] Both ends of the overflow groove 7 are provided with flared portions 9. The diameter of the flared portions 9 is larger than the diameter of the middle part of the overflow groove 7, which is conducive to the flow of sealant into and out of the overflow groove 7.

[0027] The above embodiments are merely exemplary embodiments of the present utility model and are not intended to limit the present utility model. The scope of protection of the present utility model is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present utility model within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present utility model.

Claims

1. A fuel cell composite bipolar plate adhesive groove overflow groove (7) comprising an anode plate (1) and a cathode plate (2) which are relatively sealed and laminated, characterized in that, The anode plate (1) and cathode plate (2) are provided with recessed sealing grooves (6) on the outer periphery of the hydrogen inlet / outlet (3), oxygen inlet / outlet (4) and coolant inlet / outlet (5), as well as on the outer periphery of the hydrogen flow field and the oxygen flow field. The edges of the cathode plate (2) and anode plate (1) are also provided with overflow grooves (7). The overflow grooves (7) are inclined to the sealing grooves (6) in the horizontal direction. One end of the overflow grooves (7) is connected to the sealing grooves (6), and the other end extends to the edge of the bipolar plate. The depth of the overflow grooves (7) gradually decreases from the connection with the sealing grooves (6) to the edge of the bipolar plate.

2. A fuel cell composite bipolar plate adhesive glue groove overflow groove (7) according to claim 1, characterized in that, The depth of the groove at the connection between the overflow groove (7) and the sealing groove (6) is equal to that of the sealing groove (6), and the depth is 0.1-0.3mm.

3. A fuel cell composite bipolar plate adhesive glue groove overflow groove (7) according to claim 2, characterized in that, The depth of the overflow groove (7) at the edge of the bipolar plate is 0.02-0.05 mm.

4. The fuel cell composite bipolar plate adhesive glue groove overflow groove (7) according to claim 3, characterized in that, The sealing groove (6) has several circular connecting grooves (8) that are recessed into the plate with the groove wall of the sealing groove (6) as the reference plane.

5. A fuel cell composite bipolar plate adhesive glue groove overflow groove (7) according to claim 4, characterized in that, Both ends of the overflow trough (7) are provided with flared portions (9), and the diameter of the flared portions (9) is larger than the diameter of the middle part of the overflow trough (7).

6. A fuel cell composite bipolar plate adhesive glue groove overflow groove (7) according to claim 4, characterized in that, The depth of the connecting groove (8) is 0.02-0.05mm.

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