CN212257566U

CN212257566U - Flow field type heat sink for bipolar plate

Info

Publication number: CN212257566U
Application number: CN202021537491.0U
Authority: CN
Inventors: 夏波涛; 曾茂进; 邓显椿; 夏治宇
Original assignee: Xenbo Hangzhou Heat Transfer Science & Technology Co ltd
Current assignee: Xiangbo heat transfer technology Co.,Ltd.
Priority date: 2020-07-29
Filing date: 2020-07-29
Publication date: 2020-12-29
Anticipated expiration: 2030-07-29

Abstract

The utility model discloses a flow field formula heat abstractor for bipolar plate belongs to fuel cell heat dissipation technical field. The utility model discloses a flow distribution plate that is located between negative plate and the air diffusion layer, the equal array distribution in two surfaces of flow distribution plate has the depressed part, depressed part and negative plate form first cavity and with the air diffusion layer between form the second cavity, adjacent first cavity and the mutual UNICOM of second cavity, the contact site has on the depressed part, contact site laminating negative plate or air diffusion layer, the depressed part in bank is arranged, adjacent two depressed part sunken opposite direction or the same, the port has on the depressed part, adjacent first cavity and second cavity communicate with each other through the port, the drainage plate has on the depressed part, the slope of the relative air diffusion layer of drainage plate sets up, the drainage plate meets the liquid level and towards the air diffusion layer. The utility model discloses an at the last lower extreme shaping contact surface in the flow field, very big improvement its electric conduction and heat conductivility.

Description

Flow field type heat sink for bipolar plate

Technical Field

The utility model belongs to the technical field of the fuel cell heat dissipation, especially relate to flow field formula heat abstractor for bipolar plate.

Background

At present, the metal bipolar plate is used as a core component of a fuel cell, and has important functions of supporting a membrane electrode structure, separating hydrogen and oxygen, collecting electrons, conducting heat, providing hydrogen and oxygen channels, discharging water generated by reaction, providing a coolant flow channel and the like, and the performance of the metal bipolar plate depends on the flow field structure to a great extent. The conventional flow field structure of the metal bipolar plate has a straight channel, a snake shape, a spiral shape, an interdigital shape, a grid shape and the like, and meanwhile, a novel flow field, such as a bionic flow field, a 3D flow field and the like, is continuously developed, the conventional 3D flow field on the air side is in point or line contact with the liquid-cooled metal bipolar plate and the air diffusion layer, the contact area is less than 1%, the electric conduction and heat conduction performance of the conventional flow field is very poor, the contact resistance is increased due to point or surface contact, the heat is serious when current flows through the conventional flow field structure, and meanwhile, the heat on the membrane electrode cannot be timely conducted to the surface of the liquid-cooled metal bipolar plate, so that the membrane electrode.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a flow field formula heat abstractor for bipolar plate, through the upper and lower end shaping contact surface in the flow field, very big improvement its electrically conductive and heat conductivility, avoided leading to its electric current to generate heat too big and heat transfer channel to be hindered to lead to the membrane electrode that the membrane electrode temperature produced to break, hydrogen leaks etc. not enough because of bad contact.

In order to solve the technical problem, the utility model discloses a realize through following technical scheme:

the utility model discloses a flow field formula heat abstractor for bipolar plate, including the flow distribution plate that is located between negative plate and the air diffusion layer, the equal array distribution in two surfaces of flow distribution plate has the depressed part, depressed part and negative plate form first cavity and with the air diffusion layer between form the second cavity, adjacent first cavity and the mutual UNICOM of second cavity have the contact site on the depressed part, contact site laminating negative plate or air diffusion layer.

Further, the concave parts are arranged in rows, and the concave directions of two adjacent concave parts are opposite or the same.

Furthermore, the concave part is provided with a port, the adjacent first cavities and the second cavities are communicated with each other through the port, and the adjacent two first cavities or the adjacent two second cavities are communicated through the edge gap of the concave part.

Furthermore, the air diffusion layer is attached to the contact part on the concave part, the cathode plate is attached to the concave part which is concave towards the direction of the cathode plate, and the air diffusion layer is attached to the contact part on the concave part.

Further, the sunken part is provided with a drainage plate, the drainage plate is inclined relative to the air diffusion layer, and the drainage plate faces the liquid level and faces the air diffusion layer.

Further, the contact portion is a flat plate, and the size of the contact surface is 0.1mm × 0.1mm to 10mm × 10 mm.

Further, the area of the contact portion to which the air diffusion layer is attached is not larger than the area of the contact portion to which the cathode plate 2 is attached.

Further, the depressions are "hexagonal" shaped depressions or "corrugated" shaped depressions.

Furthermore, in the hexagonal recess, a notch is formed on the port of the recess.

Further, the "corrugated" type depressions are bi-directional corrugated structures.

The utility model discloses following beneficial effect has:

the utility model discloses at the last lower extreme shaping contact surface in the flow field, very big improvement its electrically conductive and heat conductivility, avoided leading to its electric current to generate heat too big and heat transfer channel to be hindered and lead to the membrane electrode that the membrane electrode temperature is too high and produce to break because of bad contact, hydrogen leaks etc. not enough, through the flow direction of flow distribution plate control water at negative plate and air diffusion layer, make to the air diffusion layer, and then make the gas in aqueous have certain impulse action to the surface on air diffusion layer in the flow, the compulsory convection effect of production makes more gas can get into the air diffusion layer.

Of course, it is not necessary for any particular product to achieve all of the above-described advantages at the same time.

Drawings

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

FIG. 1 is a block diagram of a flow field heat sink for a bipolar plate;

FIG. 2 is an enlarged view of FIG. 1A;

FIG. 3 is a block diagram of a flow field heat sink for a bipolar plate;

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

FIG. 5 is a view showing the construction of a "hexagonal" type depressed portion drainage plate;

FIG. 6 is a structural view of a "corrugated" type depressed portion drainage plate;

FIG. 7 is a block diagram of a two-way "corrugated" type depressed portion drainage plate;

in the drawings, the components represented by the respective reference numerals are listed below:

1-anode plate, 2-cathode plate, 3-flow distribution plate, 4-air diffusion layer, 5-proton exchange membrane, 6-cooling flow cavity, 301-contact part, 302-flow guide plate, 303-first cavity, 304-second cavity, 305-notch, 306-port and 307-concave part.

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 of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "open hole", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", and the like, indicate positional or positional relationships, are merely for convenience in describing the present invention and to simplify the description, and do not indicate or imply that the components or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Referring to fig. 1-7, the present invention relates to a flow field type heat dissipation device for bipolar plate:

wherein, for part of the anode plate 1, the cathode plate 2, the air diffusion layer 4 and the proton exchange membrane 5 in the fuel cell, in the heat dissipation of the anode plate 1 and the cathode plate 2, the anode plate 1 is designed into a corrugated shape, the flow of cooling liquid is cooled by forming a channel between the corrugated anode plate 1 and the corrugated cathode plate 2, and in addition, a splitter plate 3 is arranged between the cathode plate 2 and the air diffusion layer 4 to form a flow field.

Wherein, flow distribution plate 3 is for integral design, for with integral flow distribution plate 3, the equal array of two surfaces of flow distribution plate 3 distributes has depressed part 307, and specific depressed part 307 arranges in rows, and wherein, two adjacent depressed part 307 sunken opposite directions or the same.

The corresponding concave part 307 and the cathode plate 2 form a first cavity 303 and a second cavity 304 with the air diffusion layer 4, the adjacent first cavity 303 and the second cavity 304 are communicated with each other, water generated in the fuel cell is discharged, and split flow is performed to generate a non-fixed flow channel, so that gas in the water is dispersed more uniformly.

Specifically, the contact portion 301 is located at a bottom cavity portion of the recess portion 307, the recess portion 307 is provided with a port 306, the port 306 is divided into a water inlet and a water outlet according to the flow direction of water, the adjacent first cavity 303 and the adjacent second cavity 304 are communicated with each other through the port 306, and the water outlet of one cavity is overlapped with the water inlet of the other cavity in a specific presentation.

After the concave portion 307 is formed, the concave portion 307 and the adjacent concave portion 307 form a gap, and the adjacent two first cavities 303 are communicated with each other through the gap between the edges of the concave portion 307, and the adjacent two second cavities 304 are communicated with each other through the gap between the edges of the concave portion 307.

A depressed portion 307 depressed toward the air diffusion layer 4, the contact portion 301 on the depressed portion 307 being bonded to the air diffusion layer 4, and the depressed portion 307 depressed toward the cathode plate 2, the contact portion 301 on the depressed portion 307 being bonded to the cathode plate 2.

Importantly, the concave part 307 is provided with the contact part 301, the contact part 301 is attached to the cathode plate 2 or the air diffusion layer 4, the contact area is increased through the contact part 301, the resistance generated when the air diffusion layer 4 and the cathode plate 2 are connected with the flow distribution plate 3 is sequentially reduced, the heat generation of current flowing through the resistance is further reduced, and correspondingly, the conduction of heat is increased through increasing the contact area.

The contact portion 301 is a flat plate, and the size of the contact surface is 0.1mm × 0.1mm to 10mm × 10 mm.

Further, the area of the contact part 301 attached to the air diffusion layer 4 is not larger than that of the contact part 301 attached to the cathode plate 2, and after the total contact area is determined, the area of the contact part 301 attached to the air diffusion layer 4 is controlled, so that the contact area between water and the air diffusion layer 4 is increased, and the gas in the water can more easily pass through the air diffusion layer 4.

Further, the concave portion 307 is provided with a flow guide plate 302, the flow guide plate 302 is obliquely arranged relative to the air diffusion layer 4, and the flow guide plate 302 faces the liquid level and faces the air diffusion layer 4.

The flowing directions of water in the cathode plate 2 and the air diffusion layer 4 are controlled to enable the water to impact the air diffusion layer 4, so that the gas in the water has a certain impact effect on the surface of the air diffusion layer 4 in the flowing process, and the generated forced convection effect enables more gas to enter the air diffusion layer 4.

Specifically, as shown in fig. 5, the recess 307 is a "hexagonal" recess, that is, the recess 307 is formed by connecting three hexagonal plates to three sides of a square contact 301, and the other side is a port 306, wherein the three hexagonal plates are also shared by the recesses 307 adjacent to the recess 307 and facing in opposite directions, and the shape structure of the recess can use three trapezoidal plates as an array unit, that is, a square contact and three half hexagonal plates connected to the edges of the square contact.

The edge of the port 306 is provided with a notch 5, and the stamping forming difficulty of the concave part 307 can be reduced through the notch 5.

Specifically, as shown in fig. 6, the recessed portion 307 is "corrugated", and is obliquely disposed on the splitter plate 3, the two "corrugated" recessed portions 307 serve as an array unit on the splitter plate 3, the two recessed portions 307 leading to the recessed "corrugated" are divided into a tail section and a cavity section, a port of the cavity section serves as a water inlet, a contact portion 301 is disposed on the top of the cavity section, an edge of the tail section abuts against the air diffusion layer 4, and the two edges are respectively connected with an edge of one cavity section, the tail section is communicated with the cavity section of the third "corrugated" recessed portion 307, the tail section is narrower than the cavity section, a wider end portion of the cavity section serves as a water outlet, and the water flows into the two cavity sections communicated with the cavity section.

Specifically, as shown in fig. 7, in the modified structure of the "corrugated" type concave portion 307, two "corrugated" type concave portions 307 are used as an array unit on the splitter plate 3, one concave portion 307 in one array unit is a tail section and the other is a cavity section, the concave directions of the two are opposite to each other to form a bidirectional corrugated structure, and in the water flowing direction, the cavity section and the tail section which are sequentially connected in the same row are corrugated.

Wherein the "corrugated" shaped depression 307 is not notched 305.

In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. The flow field type heat dissipation device for the bipolar plate is characterized in that: including flow distribution plate (3) that are located between negative plate (2) and air diffusion layer (4), the equal array in two surfaces of flow distribution plate (3) distributes and has depressed part (307), depressed part (307) and negative plate (2) form first cavity (303) and with air diffusion layer (4) between form second cavity (304), adjacent first cavity (303) and second cavity (304) communicate with each other, contact site (301) have on depressed part (307), contact site (301) laminating negative plate (2) or air diffusion layer (4).

2. The flow field heat sink for bipolar plates according to claim 1, wherein the dimples (307) are arranged in rows, and the direction of the dimples is opposite or the same for two adjacent dimples (307).

3. The flow field heat sink for bipolar plates according to claim 2, wherein the recess (307) has a port (306), the adjacent first cavities (303) and the adjacent second cavities (304) are communicated with each other through the port (306), and the adjacent first cavities (303) or the adjacent second cavities (304) are communicated with each other through the edge gap of the recess (307).

4. The flow field heat sink for a bipolar plate according to claim 1, wherein the air diffusion layer (4) is attached to a recessed portion (307) recessed in the direction of the air diffusion layer (4), the air diffusion layer (4) is attached to a contact portion (301) on the recessed portion (307), the cathode plate (2) is attached to the recessed portion (307) recessed in the direction of the cathode plate (2), and the contact portion (301) on the recessed portion (307) is attached to the cathode plate (2).

5. A flow-field heat sink for bipolar plates according to any of claims 1 to 4, characterised in that the depression (307) has a flow guiding plate (302), the flow guiding plate (302) is arranged obliquely with respect to the air diffusion layer (4), and the flow guiding plate (302) faces the liquid surface towards the air diffusion layer (4).

6. Flow field heat sink for bipolar plates according to claim 5, characterised in that the contact portions (301) are flat plates with contact surfaces of dimensions 0.1mm x 0.1mm to 10mm x 10 mm.

7. A flow field heat sink for bipolar plates according to claim 5, characterised in that the area of the contact portion (301) to the air diffusion layer (4) is not larger than the area of the contact portion (301) to the cathode plate (2).

8. The flow field heat sink for bipolar plates according to claim 5, wherein the depressions (307) are "hexagonal" shaped depressions or "corrugated" shaped depressions.

9. The flow field heat sink for bipolar plate according to claim 8, wherein the hexagonal recess has a notch (305) at the end (306) of the recess (307).

10. The flow field heat sink for bipolar plates according to claim 8, wherein the "corrugated" depressions are bi-directionally corrugated.