CN211376817U

CN211376817U - Bipolar plate of fuel cell and fuel cell

Info

Publication number: CN211376817U
Application number: CN201922019798.5U
Authority: CN
Inventors: 陈亮; 郝义国; 刘超
Original assignee: Wuhan Central Hydrogen Energy Industry Innovation Center Co ltd
Current assignee: Grove Hydrogen Energy Technology Group Co ltd
Priority date: 2019-11-20
Filing date: 2019-11-20
Publication date: 2020-08-28
Anticipated expiration: 2029-11-20

Abstract

The utility model discloses a fuel cell's bipolar plate and fuel cell relates to the fuel cell field, this bipolar plate includes first polar plate and second polar plate, first polar plate and second polar plate all have the opening, be formed with the annular chamber that corresponds the opening between first polar plate and the second polar plate, the annular chamber centers on corresponding opening and communicates with each other with corresponding opening, first polar plate has first sealed gluey line holding tank, the second polar plate has second sealed gluey line holding tank, a plurality of bearing structure have in the annular chamber, the orthographic projection of a plurality of bearing structure on first polar plate is located first sealed gluey line holding tank, the orthographic projection of second sealed gluey line holding tank on first polar plate coincides with first sealed gluey line holding tank. When the bipolar plate is compressed, pressure is transmitted on the sealing rubber line and the supporting structure, the pressure of the sealing rubber line on the first polar plate and the pressure of the sealing rubber line on the second polar plate are collinear, the pressure can be uniformly applied to the sealing rubber line, and the problem that the sealing performance is reduced due to the fact that the long time stress of the sealing rubber line is uneven is solved.

Description

Bipolar plate of fuel cell and fuel cell

Technical Field

The present disclosure relates to the field of fuel cells, and more particularly, to a bipolar plate for a fuel cell and a fuel cell.

Background

A fuel cell is a chemical device that directly converts chemical energy of fuel into electric energy, and is a fourth power generation technology following hydroelectric power generation, thermal power generation, and atomic power generation.

Bipolar plates are important structures in fuel cells, which typically include stacked sets of bipolar plates, each set including a cathode plate and an anode plate, with the cathode and anode plates overlapping one another. And a membrane electrode is clamped between the two adjacent groups of bipolar plates. All be provided with the joint tape line holding tank on negative plate and anode plate, wherein be provided with the joint tape line, in same bipolar plate, the joint tape line holding tank on negative plate and the joint tape line holding tank on the anode plate are dislocation arrangement.

In the fuel cell, a plurality of groups of bipolar plates are compressed by adopting larger pressure after being stacked, so that the sealing rubber wire and the membrane electrode form sealing. Because the line holding tank is glued to the sealing on the sealed gluey line holding tank on the negative plate and the positive plate is dislocation arrangement, consequently the line is glued to the sealing also is dislocation arrangement for during the pressurized, the pressure that the line was glued to the sealing on the negative plate received and the pressure that the line was glued to the sealing on the positive plate received is not collinear, thereby leads to the line atress of gluing to be inhomogeneous, the problem that the sealing performance of the line was glued to the easy emergence sealing after long-time descends, has the risk of leaking.

SUMMERY OF THE UTILITY MODEL

The embodiment of the disclosure provides a bipolar plate of a fuel cell and the fuel cell, which can improve the sealing performance of a sealant line. The technical scheme is as follows:

in one aspect, the present disclosure provides a bipolar plate for a fuel cell, including a first plate and a second plate overlapping each other, one of the first plate and the second plate being a cathode plate, the other being an anode plate, the first plate and the second plate each having a plurality of openings, the plurality of openings including at least one of an oxidant inlet, a fuel inlet, a coolant inlet, an oxidant outlet, a fuel outlet, and a coolant outlet, the first plate and the second plate each having opposite first and second surfaces, an annular cavity corresponding to the openings being formed between the first surface of the first plate and the first surface of the second plate, the annular cavity surrounding the corresponding openings and communicating with the corresponding openings, the second surface of the first plate having a first sealant line receiving groove extending along the annular cavity, the second surface of the second polar plate is provided with a second sealing rubber line containing groove extending along the annular cavity, a plurality of supporting structures are arranged in the annular cavity, the supporting structures surround the opening at intervals, the supporting structures are supported between the first polar plate and the second polar plate, orthographic projections of the supporting structures on the first polar plate are located in the first sealing rubber line containing groove, and orthographic projections of the second sealing rubber line containing groove on the first polar plate are coincided with the first sealing rubber line containing groove.

Optionally, the plurality of support structures include a plurality of first stamping protrusions formed by groove bottoms of the first sealant line receiving grooves, and end surfaces of the plurality of first stamping protrusions are in contact with the second pole plate.

Optionally, the plurality of support structures include a plurality of first stamping protrusions formed by the groove bottom of the first sealant line accommodating groove and a plurality of second stamping protrusions formed by the groove bottom of the second sealant line accommodating groove, end surfaces of the plurality of first stamping protrusions are all in contact with the second pole plate, end surfaces of the plurality of second stamping protrusions are all in contact with the first pole plate, and the plurality of first stamping protrusions and the plurality of second stamping protrusions are alternately distributed at intervals along the annular cavity.

Optionally, each of the support structures includes a first stamping protrusion formed by the groove bottom of the first sealant line accommodating groove and a second stamping protrusion formed by the groove bottom of the second sealant line accommodating groove, the first stamping protrusion and the second stamping protrusion are arranged in a one-to-one correspondence, and an end surface of the first stamping protrusion is in contact with a corresponding end surface of the second stamping protrusion.

Optionally, the first and second stamped projections are the same height.

Optionally, all be provided with the sealant line in the first sealant line holding tank and in the second sealant line holding tank.

Optionally, the sealant line at least located in the first sealant line receiving groove has a plurality of bumps, the bumps of the sealant line located in the first sealant line receiving groove correspond to the first stamping protrusions one to one, and the bumps are located in the corresponding first stamping protrusions.

Optionally, the support structure is cylindrical, elliptical cylindrical or prismatic.

Optionally, the first polar plate and the second polar plate have a thickness of 0.1mm to 0.3 mm.

In another aspect, embodiments of the present disclosure also provide a fuel cell including the bipolar plate according to the previous aspect.

The beneficial effects brought by the technical scheme provided by the embodiment of the disclosure at least comprise:

by providing a support structure in the annular chamber, the support structure is supported between the first and second pole plates such that pressure can be transmitted through the support structure. The first polar plate is provided with a first sealant line containing groove, the second polar plate is provided with a second sealant line containing groove, and the orthographic projection of the second sealant line containing groove on the first polar plate is superposed with the first sealant line containing groove, so that sealant lines on the first polar plate and the second polar plate can be overlapped when the sealant lines are arranged. And bearing structure orthographic projection on first polar plate is located first sealed glue line holding tank, like this in the fuel cell, when compressing tightly bipolar plate, pressure transmits on sealed glue line and bearing structure, the pressure collineation of sealed glue line on the first polar plate and the sealed glue line on the second polar plate, pressure can be acted on sealed glue line uniformly, has avoided the problem that the sealing performance that sealed glue line length atress inequality leads to descends, has improved the leakproofness.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a schematic structural view of a bipolar plate of a fuel cell in the related art;

FIG. 2 is a sectional view A-A of FIG. 1;

fig. 3 is a schematic structural diagram of a bipolar plate of a fuel cell provided in an embodiment of the present disclosure;

FIG. 4 is a cross-sectional view A '-A' of FIG. 3;

FIG. 5 is a schematic view of a partial structure of another bipolar plate provided in accordance with an embodiment of the present disclosure;

figure 6 is a schematic view of a partial structure of another bipolar plate provided by embodiments of the present disclosure;

fig. 7 is a partial structural schematic view of a bipolar plate according to an embodiment of the present disclosure.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

Fig. 1 is a schematic structural view of a bipolar plate of a fuel cell in the related art. Fig. 2 is a sectional view a-a in fig. 1. As shown in fig. 1 and 2, the bipolar plate includes a first plate 11 and a second plate 12 overlapping each other. The first electrode plate 11 may be one of a cathode plate and an anode plate, and the second electrode plate 12 is the other of the cathode plate and the anode plate. The middle parts of the first polar plate 11 and the second polar plate 12 are flow channel regions B, and fluid channels are distributed in the flow channel regions B. The flow channel region B has inlet and outlet regions for fuel, oxidant, and coolant at both ends thereof, and the inlet and outlet regions have openings including an oxidant inlet D, a fuel inlet E, a coolant inlet F, an oxidant outlet D, a fuel outlet E, and a coolant outlet F.

The first plate 11 and the second plate 12 have opposite first and second surfaces, and a ring cavity 10a corresponding to the opening is formed between the first surface of the first plate 11 and the first surface of the second plate 12, and the ring cavity 10a surrounds and communicates with the corresponding opening. The second surface of the first plate 11 has a first sealant string receiving groove 11a extending along the annular cavity 10a, and the second surface of the second plate 12 has a second sealant string receiving groove 12a extending along the annular cavity 10 a. The first sealant line receiving groove 11a and the second sealant line receiving groove 12a are arranged in a staggered manner. This causes the sealant threads 20 disposed in the first sealant thread receiving groove 11a and the second sealant thread receiving groove 12a to be misaligned, as shown in fig. 2, the two sealant threads 20 are not subjected to collinear pressure F, pressure cannot be uniformly transmitted between the sealant threads 20, the sealant threads 20 are not uniformly subjected to stress, the sealing performance of the sealant threads 20 is reduced in a state of being pressed for a long time, and there is a risk of leakage. Moreover, the stress of the sealant line 20 on the first polar plate 11 is different from that of the sealant line 20 on the second polar plate 12, and the sealant line needs to be designed separately during design to ensure the sealing performance, so that the design difficulty and the cost are high.

Fig. 3 is a schematic structural diagram of a bipolar plate of a fuel cell provided in an embodiment of the present disclosure. FIG. 4 is a cross-sectional view A '-A' of FIG. 3. As shown in fig. 3 and 4, the bipolar plate includes a first plate 11 and a second plate 12 overlapped with each other. One of the first and

second electrode plates

11 and 12 is a cathode plate and the other is an anode plate, and the present disclosure does not specifically limit whether the first electrode plate 11 is a cathode plate or an anode plate.

The first polar plate 11 and the second polar plate 12 are respectively provided with a plurality of openings C, and the plurality of openings C comprise at least one of an oxidant inlet D, a fuel inlet E, a cooling liquid inlet F, an oxidant outlet D, a fuel outlet E and a cooling liquid outlet F. The present disclosure takes opening C as an oxidant inlet D as an example.

The first plate 11 and the second plate 12 each have opposite first and second surfaces. A ring cavity 10a corresponding to the opening C is formed between the first surface of the first plate 11 and the first surface of the second plate 12, and the ring cavity 10a surrounds and communicates with the corresponding opening C. The second surface of the first plate 11 has a first sealant string receiving groove 11a extending along the annular cavity 10a, and the second surface of the second plate 12 has a second sealant string receiving groove 12a extending along the annular cavity 10 a.

As shown in fig. 4, the annular cavity 10a has a plurality of support structures 30 therein, the plurality of support structures 30 being spaced around the opening C, the plurality of support structures 30 being supported between the first plate 11 and the second plate 12. The orthographic projections of the plurality of supporting structures 30 on the first polar plate 11 are located in the first sealant line accommodating groove 11a, and the orthographic projections of the second sealant line accommodating groove 12a on the first polar plate 11 are overlapped with the first sealant line accommodating groove 11 a.

As shown in fig. 4, each support structure 30 may include a first punched protrusion 31 formed by the groove bottom of the first sealant wire receiving groove 11a and a second punched protrusion 32 formed by the groove bottom of the second sealant wire receiving groove 12 a. The first punching projections 31 and the second punching projections 32 are arranged in one-to-one correspondence, and the end surfaces of the first punching projections 31 are in contact with the end surfaces of the corresponding second punching projections 32. Namely, a first punching projection 31 and a second punching projection 32 are correspondingly arranged to constitute a supporting structure 30. The first polar plate 11 is provided with a plurality of first stamping protrusions 31, the second polar plate 12 is provided with a plurality of second stamping protrusions 32, the common cathode plate and the anode plate are both made by stamping metal plates, the bottom of the first sealing glue line accommodating groove 11a is utilized to form the plurality of first stamping protrusions 31, the bottom of the second sealing glue line accommodating groove 12a is utilized to form the plurality of second stamping protrusions 32, when the first polar plate 11 is made by stamping, the first stamping protrusions 31 can be stamped out simultaneously, when the second polar plate 12 is made by stamping, the second stamping protrusions 32 can be stamped out simultaneously, the bipolar plate manufacturing is convenient, and the mass production of the bipolar plate is convenient. And the terminal surface of the first punching bulge 31 contacts with the terminal surface of the corresponding second punching bulge 32, the first punching bulge 31 and the second punching bulge 32 are overlapped to jointly play a supporting role, the heights of the first punching bulge 31 and the second punching bulge 32 are both smaller, so that punch forming is facilitated, and defective products are not easy to appear in the punching process.

Alternatively, the sum of the heights of the first punched-out projection 31 and the second punched-out projection 32 may be 0.1mm to 0.6mm, and too large a sum of the heights of the first punched-out projection 31 and the second punched-out projection 32 may increase the difficulty of the process, and too small a sum of the heights may affect the flow of the medium in the annular chamber 10a, where the medium may be any one of the oxidizer, the fuel, and the coolant.

As shown in fig. 4, the heights h of the first and second punched

protrusions

31 and 32 may be the same. When the first punching protrusion 31 and the second punching protrusion 32 are punched, the punching strokes are the same, the punching difficulty of the first pole plate 11 and the second pole plate 12 is equivalent, and the product quality of the first pole plate 11 and the second pole plate 12 is equivalent.

Fig. 5 is a partial schematic structural view of another bipolar plate provided in the embodiments of the present disclosure. The position shown in fig. 5 is the same as the position shown in the M-direction view in fig. 3. In fig. 5, the first and

second pole plates

11 and 12 are slightly separated in order to distinguish the first and second punched

protrusions

31 and 32. As shown in fig. 5, in the bipolar plate, the plurality of support structures 30 may include a plurality of first punched protrusions 31 formed by the groove bottoms of the first sealant wire receiving grooves 11a and a plurality of second punched protrusions 32 formed by the groove bottoms of the second sealant wire receiving grooves 12 a. The end surfaces of the first plurality of stamped protrusions 31 are in contact with the second pole plate 12, and the end surfaces of the second plurality of stamped protrusions 32 are in contact with the first pole plate 11. The plurality of first punched protrusions 31 and the plurality of second punched protrusions 32 are alternately spaced along the annular cavity 10 a. In the case of the same height of the support structure 30, the first punched projection 31 and the second punched projection 32 in fig. 5 have a higher height than the bipolar plate shown in fig. 4. However, in the same supporting effect, the number of the first punched protrusions 31 on the first plate 11 in fig. 5 may be smaller than the number of the first punched protrusions 31 on the first plate 11 in fig. 4, and the number of the second punched protrusions 32 on the second plate 12 in fig. 5 may be smaller than the number of the second punched protrusions 32 on the second plate 12 in fig. 4.

Fig. 6 is a partial schematic structural view of another bipolar plate provided by an embodiment of the present disclosure. The position shown in fig. 6 is the same as the position shown in the M-direction view in fig. 3. In fig. 6, the first and

second pole plates

11 and 12 are slightly separated for easy viewing of the first punched projection 31. As shown in fig. 6, in the bipolar plate, the plurality of support structures 30 may include a plurality of first punched protrusions 31 formed by the groove bottoms of the first sealant wire receiving grooves 11a, and end surfaces of the plurality of first punched protrusions 31 are in contact with the second plate 12. Therefore, when the first pole plate 11 and the second pole plate 12 are manufactured, the first stamping bulge 31 can be formed on the first pole plate 11 only by stamping, and the second pole plate 12 does not need to be formed with the stamping bulge, so that the stamping equipment for manufacturing the second pole plate 12 does not need to be changed, and the cost on the stamping equipment is favorably reduced.

Alternatively, the support structure 30 may be cylindrical, elliptical cylindrical, or prismatic. The shape of the support structure 30 can be configured according to different needs. The support structure 30 may preferably be cylindrical or elliptical, which is easier to stamp and less prone to breakage during stamping than prismatic.

As shown in fig. 4, the thickness m of the first and

second electrode plates

11 and 12 may be 0.1mm to 0.3 mm. The excessive thickness of the first and

second electrode plates

11 and 12 affects the structural strength of the bipolar plate, is inconvenient to punch and form, and greatly increases the weight of the fuel cell. The first plate 11 and the second plate 12 can be made of a steel plate with a thickness of 0.1mm to 0.3mm by stamping.

The sealant line 20 can be disposed in the first sealant line receiving groove 11a and the second sealant line receiving groove 12 a. When a plurality of groups of bipolar plates are stacked to manufacture a fuel cell, the sealing rubber wire 20 needs to be arranged in the first sealing rubber wire accommodating groove 11a and the second sealing rubber wire accommodating groove 12a, a membrane electrode needs to be clamped between the two groups of bipolar plates, and after pressurization, sealing is formed between the sealing rubber wire 20 and the membrane electrode. The upper sealing rubber line 20 is arranged in the first sealing rubber line accommodating groove 11a and the second sealing rubber line accommodating groove 12a, so that the subsequent fuel cell assembly is facilitated.

The width of the sealant line 20 may be smaller than the width of the first sealant line receiving groove 11a, and the width of the sealant line 20 is also smaller than the width of the second sealant line receiving groove 12 a. This is because the sealing glue line 20 can produce certain deformation after the pressurization, and consequently the width that sets up the width of sealing glue line 20 is little than the width in groove, and when sealing glue line 20 deformed, sealing glue line 20 can have the space to take place to deform in first sealing glue line holding tank 11a and second sealing glue line holding tank 12a, avoids the too big damage failure of sealing glue line 20 that leads to of pressure.

Fig. 7 is a partial structural schematic view of a bipolar plate according to an embodiment of the present disclosure. As shown in fig. 7, the sealant line 20 in the first sealant line receiving groove 11a may have a plurality of bumps 21, the bumps 21 of the sealant line 20 in the first sealant line receiving groove 11a correspond to the first stamping protrusions 31 one by one, and the bumps 21 are located in the corresponding first stamping protrusions 31. Through setting up lug 21, lug 21 is located first punching press and protrudes 31, can increase the area of contact of joint strip line 20 and first joint strip line holding tank 11a, makes joint strip line 20 install more firmly.

The shape of the projection 21 may be the same as that of the first punched-out projection 31 so that the projection 21 can be completely attached to the inner wall of the first punched-out projection 31.

For the bipolar plates shown in fig. 4 and 5, the first plate 11 has a first stamped projection 31 thereon and the second plate 12 has a second stamped projection 32 thereon. The sealant line 20 in the second sealant line receiving groove 12a may also have a plurality of bumps 21, the bumps 21 of the sealant line 20 in the second sealant line receiving groove 12a correspond to the second stamping protrusions 32 one by one, and the bumps 21 are located in the corresponding second stamping protrusions 32. Also, this can increase the contact area between the sealant line 20 and the second sealant line-receiving groove 12a, so that the sealant line 20 can be more securely mounted.

Alternatively, the sealant line 20 may be injection molded in the first sealant line receiving groove 11 a. The sealant line 20 located in the first sealant line receiving groove 11a is directly formed on the first electrode plate 11 by injection molding, so that the sealant line 20 is more tightly combined with the first electrode plate 11, and the protrusion 21 can be directly formed in the first stamping protrusion 31. The sealant line 20 located in the second sealant line receiving groove 12a can also be formed on the second pole plate 12 by injection molding.

In a possible implementation manner of the present disclosure, the sealant line 20 located in the first sealant line accommodating groove 11a may also be bonded to the first electrode plate 11, and the sealant line 20 located in the second sealant line accommodating groove 12a may also be bonded to the second electrode plate 12, so that the sealant line 20 may be prepared in advance, and then bonded by using a bonding agent, which is simple in process.

Embodiments of the present disclosure also provide a fuel cell including any one of the bipolar plates shown in fig. 3 to 7.

The above description is meant to be illustrative of the principles of the present disclosure and not to be taken in a limiting sense, and any modifications, equivalents, improvements and the like that are within the spirit and scope of the present disclosure are intended to be included therein.

Claims

1. A bipolar plate of a fuel cell comprises a first polar plate (11) and a second polar plate (12) which are overlapped with each other, one of the first polar plate (11) and the second polar plate (12) is a cathode plate, the other one is an anode plate, the first polar plate (11) and the second polar plate (12) are respectively provided with a plurality of openings (C), the plurality of openings (C) comprise at least one of an oxidant inlet (D), a fuel inlet (E), a cooling liquid inlet (F), an oxidant outlet (D), a fuel outlet (E) and a cooling liquid outlet (F), the first polar plate (11) and the second polar plate (12) are respectively provided with a first surface and a second surface which are opposite, and an annular cavity (10a) corresponding to the opening (C) is formed between the first surface of the first polar plate (11) and the first surface of the second polar plate (12), said annular chamber (10a) surrounding the respective opening (C) and communicating with the respective opening (C), the second surface of the first plate (11) having a first sealing bead receiving groove (11a) extending along the annular chamber (10a), the second surface of the second plate (12) having a second sealing bead receiving groove (12a) extending along the annular chamber (10a), characterized in that a plurality of support structures (30) are provided in the annular chamber (10a), said plurality of support structures (30) being spaced apart around the opening (C), said plurality of support structures (30) being supported between the first plate (11) and the second plate (12), the orthographic projection of the plurality of support structures (30) on the first plate (11) being located in the first sealing bead receiving groove (11a), the orthographic projection of the second sealing bead (12a) on the first plate (11) and the opening (C) being in communication with the second sealing bead receiving groove (12a) The first sealant line accommodating grooves (11a) are overlapped.

2. A bipolar plate according to claim 1, wherein the plurality of support structures (30) comprise a plurality of first stamped projections (31) formed by the groove bottoms of the first bead receiving grooves (11a), the end faces of the plurality of first stamped projections (31) each being in contact with the second plate (12).

3. A bipolar plate according to claim 1, wherein said plurality of support structures (30) comprises a plurality of first stamped projections (31) formed by the bottom of said first housing groove (11a) and a plurality of second stamped projections (32) formed by the bottom of said second housing groove (12a), the end faces of said plurality of first stamped projections (31) each being in contact with said second plate (12), the end faces of said plurality of second stamped projections (32) each being in contact with said first plate (11), said plurality of first stamped projections (31) and said plurality of second stamped projections (32) being alternately spaced along said annular cavity (10 a).

4. A bipolar plate according to claim 1, wherein each support structure (30) comprises a first stamped projection (31) formed by the groove bottom of the first bead wire receiving groove (11a) and a second stamped projection (32) formed by the groove bottom of the second bead wire receiving groove (12a), the first stamped projection (31) and the second stamped projection (32) being arranged in a one-to-one correspondence, the end face of the first stamped projection (31) being in contact with the end face of the corresponding second stamped projection (32).

5. A bipolar plate as claimed in claim 4, wherein the first stamped projection (31) and the second stamped projection (32) have the same height.

6. A bipolar plate as claimed in any one of claims 2 to 5, wherein a bead wire (20) is provided in both the first bead wire receiving groove (11a) and the second bead wire receiving groove (12 a).

7. A bipolar plate as claimed in claim 6, wherein at least the bead (20) in the first bead receiving groove (11a) has a plurality of projections (21), the projections (21) of the bead (20) in the first bead receiving groove (11a) corresponding to the first stamped projections (31), the projections (21) being located in the corresponding first stamped projections (31).

8. A bipolar plate as claimed in any one of claims 1 to 5, wherein the support structure (30) has a cylindrical, elliptical or prismatic shape.

9. A bipolar plate as claimed in any one of claims 1 to 5, wherein the first plate (11) and the second plate (12) have a thickness of 0.1mm to 0.3 mm.

10. A fuel cell comprising the bipolar plate according to any one of claims 1 to 9.