CN214203742U

CN214203742U - Fuel cell metal bipolar plate insulating sleeve, bipolar plate with same and fuel cell

Info

Publication number: CN214203742U
Application number: CN202023299453.9U
Authority: CN
Inventors: 马朋飞; 刘岩青
Original assignee: Weishi Energy Technology Co Ltd
Current assignee: Weishi Energy Technology Co Ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2021-09-14
Anticipated expiration: 2030-12-31

Abstract

The utility model discloses a fuel cell metal bipolar plate insulating sleeve and have its bipolar plate and fuel cell. The insulating sleeve is of a frame structure, and an interlayer is arranged in the frame structure; the insulating sleeve covers the outer edge of the metal bipolar plate by inserting the outer edge of the metal bipolar plate into the interlayer. The outer edge of the insulating sleeve is provided with a plurality of limiting ports for limiting a stack fastening rod when the fuel cell metal stack is assembled. The utility model provides an outward flange cladding of bipolar plate has above-mentioned insulating cover. The utility model provides a fuel cell is for having the fuel cell of above-mentioned bipolar plate. The utility model discloses reduce the possibility of bipolar plate short circuit, reduced the whole volume of fuel cell pile simultaneously.

Description

Fuel cell metal bipolar plate insulating sleeve, bipolar plate with same and fuel cell

Technical Field

The utility model relates to a fuel cell technical field especially relates to a fuel cell metal bipolar plate insulating sleeve and have its bipolar plate and fuel cell.

Background

The fuel cell is generally formed by stacking a membrane electrode, a bipolar plate, a collector plate, an end plate and the like, wherein the membrane electrode is a core unit for generating electricity through reaction of the fuel cell, and hydrogen and air respectively perform oxidation-reduction reaction on an anode and a cathode of the membrane electrode to release electric energy and generate water. The bipolar plate is used as a medium channel of a cathode and an anode and cooling water and also has the function of electron transmission. A complete fuel cell stack generally requires tens or even hundreds of membrane electrodes, and both sides of the membrane electrodes are bipolar plates, so the number of bipolar plates in the fuel cell stack is very large. In the assembling process, the metal bipolar plate and the frame of the membrane electrode are made of thin materials, so that the metal bipolar plate and the frame of the membrane electrode are easily affected by external force to cause deformation damage and even cause short circuit between the bipolar plates. In addition, because the bipolar plate is made of conductive materials, the fastening rods between the upper end plate and the lower end plate need to be far away from the bipolar plate when the fuel cell stack is assembled, and the bipolar plate is prevented from being reduced in insulating property due to the fact that the bipolar plate is too close to the fastening rods, and therefore the volume of the fuel cell is increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a fuel cell metal bipolar plate insulating boot and have its bipolar plate and fuel cell.

In order to achieve the above object, the utility model provides a following scheme:

a fuel cell metal bipolar plate insulating sleeve is characterized in that the insulating sleeve is of a frame structure, and an interlayer is arranged in the frame structure; the insulating sleeve covers the outer edge of the metal bipolar plate by inserting the outer edge of the metal bipolar plate into the interlayer.

Optionally, the outer edge of the insulating sleeve is provided with a plurality of limiting openings for limiting the stack fastening rod when the fuel cell metal stack is assembled.

Optionally, at least two opposite sides of the insulating sleeve are provided with limiting openings.

The utility model also provides a fuel cell metal bipolar plate, fuel cell metal bipolar plate's outward flange cladding has the utility model provides an insulating cover.

Optionally, the outer edge of the insulating sleeve is provided with a plurality of limiting openings, and the position of the edge of the bipolar plate corresponding to the limiting openings of the insulating sleeve is provided with the limiting openings.

The utility model also provides a fuel cell, include: upper end plate, lower plate, go up the collection and flow board, flow board and a plurality of by membrane electrode and the utility model provides a bipolar plate piles up the battery body that constitutes together, wherein, go up the collection flow board with the lower collection is flowed the board and is located respectively battery body's both sides, the upper end plate lid is in go up the outside that the collection flowed the board, the lower collection flow board lid is in the outside that the lower collection flowed the board.

Optionally, there is no gap between the insulating sleeves of adjacent bipolar plates.

Optionally, the outer edge of the insulating sleeve is provided with a plurality of limiting openings, and the positions corresponding to the limiting openings of the insulating sleeve on the edge of the bipolar plate, the edge of the membrane electrode, the edge of the upper current collecting plate and the edge of the lower current collecting plate are all provided with limiting openings.

According to the utility model provides a concrete embodiment, the utility model discloses a following technological effect: the utility model provides an insulating cover parcel is at bipolar plate's edge, because insulating cover is insulating material, has strengthened the dielectric strength between the adjacent bipolar plate in the fuel cell stack, reduces the possibility of short circuit between the bipolar plate.

The utility model provides a there is not the clearance between the insulating cover of adjacent bipolar plate among the fuel cell, two adjacent insulating covers closely paste together promptly, have avoided fuel cell pile to receive external force and take place the probability of deformation in the equipment process.

In addition, due to the insulating effect of the insulating sleeve, the fastening rod does not need to keep a certain safety distance with the bipolar plate, and the volume of the fuel cell is reduced. And the arrangement of the insulating sleeve limiting port, the collector plate limiting port and the end plate limiting port realizes the limitation of the fastening rod and improves the assembly efficiency of the fuel cell.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of an insulation sleeve provided in embodiment 1 of the present invention;

FIG. 2 is a schematic view of the assembly of the insulating sleeve and the metal bipolar plate according to the embodiment of the present invention;

fig. 3 is a separated view of the insulating sheath, the bipolar plate and the membrane electrode of example 3 of the present invention when they are not combined;

fig. 4 is an assembly diagram of the insulating sleeve, the bipolar plate and the membrane electrode assembly according to example 3 of the present invention;

fig. 5 is an assembly view of the whole fuel cell stack with the fastening rods separated according to embodiment 3 of the present invention;

fig. 6 is an overall assembly view of a fuel cell stack according to embodiment 3 of the present invention.

Wherein, 1, an insulating sleeve; 2. a bipolar plate; 3. a membrane electrode; 11. a first insulating sleeve limiting opening; 12. a second insulation sleeve limiting opening; 13. a third insulating sleeve limiting opening; 14. a fourth insulation sleeve limiting opening; 21. a first bipolar plate limiting opening; 22. a second bipolar plate limiting opening; 23. a third bipolar plate limiting port; 24. a fourth bipolar plate limiting port; 31. a first membrane electrode limiting port; 32. a second membrane electrode limiting port; 33. a third membrane electrode limiting port; 34. a fourth membrane electrode limiting port; 41. a first fastening rod; 42. a second fastening rod; 43. a third fastening rod; 44. a fourth fastening rod; 5. a lower current collecting plate; 6. an upper current collecting plate; 7. a lower end plate; 8. and an upper end plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.

Example 1

Referring to fig. 1, the present embodiment provides an insulating sleeve for a metal bipolar plate of a fuel cell, where the insulating sleeve 1 is a frame structure, and an interlayer is disposed in the frame structure. As shown in fig. 2, the insulating sleeve 1 covers the outer edges of the metallic bipolar plate 2 by interposing the outer edges of the metallic bipolar plate 2 into an interlayer.

As an implementation manner of this embodiment, a plurality of limiting openings may be formed in the outer edge of the insulating sleeve 1 for limiting the stack fastening rods during the assembly of the metal fuel cell stack. Preferably, two opposite sides of the insulating sleeve 1 are provided with a limiting opening, which may be specifically a first insulating sleeve limiting opening 11, a second insulating sleeve limiting opening 12, a third insulating sleeve limiting opening 13, and a fourth insulating sleeve limiting opening 14, as shown in fig. 1.

Example 2

Referring to fig. 2, the present embodiment provides a fuel cell metal bipolar plate 2 having its outer edges coated with an insulating sheath 1 as provided in embodiment 1.

Example 3

Referring to fig. 3 to 5, the present embodiment provides a fuel cell including: an upper end plate 8, a lower end plate 7, an upper current collecting plate 6, a lower current collecting plate 5, and a plurality of cell bodies 9 formed by stacking the membrane electrode 3 and the bipolar plate 2 provided in embodiment 2, wherein the upper current collecting plate 6 and the lower current collecting plate 5 are respectively located at two sides of the cell bodies 9, the upper end plate 8 covers the outer side of the upper current collecting plate 6, and the lower current collecting plate 7 covers the outer side of the lower current collecting plate 5.

As an embodiment of this embodiment, the edge of the membrane electrode 3, the edge of the upper current collecting plate 6, and the edge of the lower current collecting plate 5 are provided with limiting openings at positions corresponding to the limiting openings of the insulating sleeve. Specifically, the following may be mentioned: the insulating sleeve 1 is annularly coated on the edge of the bipolar plate 2, and the edge of the bipolar plate 2 is provided with a first bipolar plate limiting port 21, a second bipolar plate limiting port 22, a third bipolar plate limiting port 23 and a fourth bipolar plate limiting port 24. The surface of the bipolar plate 2 is connected with a membrane electrode 3, and the edge of the membrane electrode 3 is provided with a first membrane electrode limiting port 31, a second membrane electrode limiting port 32, a third membrane electrode limiting port 33 and a fourth membrane electrode limiting port 34. The first limit port 11 of the insulating sleeve, the first bipolar plate limit port 21 and the first membrane electrode limit port 31 are in a pairwise nested relationship; the second limit port 12 of the insulating sleeve is in a two-to-two nested relationship with the second bipolar plate limit port 22 and the second membrane electrode limit port 32; the third insulating sleeve limiting port 13, the third bipolar plate limiting port 23 and the third membrane electrode limiting port 33 are in a pairwise nested relation; the fourth limit port 14 of the insulating sleeve is in a two-to-two nesting relationship with the fourth bipolar plate limit port 24 and the fourth membrane electrode limit port 34.

As shown in fig. 5 and 6, the insulating sleeve 1, the bipolar plate 2 and the membrane electrode 3 are combined into a unit, a plurality of units are stacked together, the upper and lower parts of the units are respectively combined with the upper current collecting plate 6, the upper end plate 8, the lower current collecting plate 5 and the lower end plate 8, and the first fastening rod 41, the second fastening rod 42, the third fastening rod 43 and the fourth fastening rod 44 are respectively connected with the upper end plate 8 and the lower end plate 7, and are respectively nested in the first limit opening 11, the second limit opening 12, the third limit opening 13 and the fourth limit opening 14 of the insulating sleeve. The specific fastening mode refers to the mode of the fuel cell fastening rod in the prior art, and is not described herein again.

The utility model has the advantages of it is following:

1) the insulating sleeves are wrapped on the edges of the bipolar plates, and two adjacent insulating sleeves are tightly attached together in the fuel cell stack, so that the probability of deformation of the fuel cell stack caused by external force in the assembling process is avoided, the external force bearing strength of the stack is improved, and the stack is not easy to damage and deform;

2) because the insulating sleeve is made of insulating materials, the insulating strength between adjacent bipolar plates in the fuel cell stack is enhanced, and the possibility of short circuit between the bipolar plates is reduced;

3) the structure that the spacing opening of the insulating sleeve is connected with the fastening rod in a clinging manner is beneficial to the assembly and spacing of the fuel cell stack, and the assembly efficiency is improved; the insulating sleeve separates the bipolar plate and the fastening rod, so that the fastening rod does not need to keep a certain safety distance with the bipolar plate due to insulating factors, the whole volume of the fuel cell stack is smaller, and the power volume ratio of the fuel cell stack is further improved.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The principle and the implementation of the present invention are explained herein by using specific examples, and the above description of the embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.

Claims

1. The fuel cell metal bipolar plate insulating sleeve is characterized in that the insulating sleeve is of a frame structure, and an interlayer is arranged in the frame structure; the insulating sleeve covers the outer edge of the metal bipolar plate by inserting the outer edge of the metal bipolar plate into the interlayer.

2. The fuel cell metal bipolar plate insulating sleeve according to claim 1, wherein a plurality of limiting openings are formed in the outer edge of the insulating sleeve for limiting the stack fastening rods during the assembly of the fuel cell metal stack.

3. The fuel cell metal bipolar plate insulating sleeve as claimed in claim 1, wherein at least two opposite sides of the insulating sleeve are provided with limiting openings.

4. A fuel cell metal bipolar plate characterized in that the outer edge of the fuel cell metal bipolar plate is coated with an insulating sheath according to any one of claims 1 to 3.

5. The fuel cell metal bipolar plate of claim 4, wherein a plurality of limiting openings are formed in the outer edge of the insulating sleeve, and limiting openings are formed in the edge of the bipolar plate at positions corresponding to the limiting openings of the insulating sleeve.

6. A fuel cell, comprising: an upper end plate, a lower end plate, an upper current collecting plate, a lower current collecting plate, and a plurality of cell bodies formed by stacking membrane electrodes and the bipolar plates according to claim 4, wherein the upper current collecting plate and the lower current collecting plate are respectively located at two sides of the cell body, the upper end plate covers the outer side of the upper current collecting plate, and the lower current collecting plate covers the outer side of the lower current collecting plate.

7. The fuel cell of claim 6, wherein there are no gaps between the insulating sleeves of adjacent bipolar plates.

8. The fuel cell according to claim 6 or 7, wherein a plurality of limiting openings are formed on the outer edge of the insulating sleeve, and limiting openings are formed on the edges of the bipolar plate, the membrane electrode, the upper current collector and the lower current collector at positions corresponding to the limiting openings of the insulating sleeve.