CN212366014U

CN212366014U - Fuel cell end plate

Info

Publication number: CN212366014U
Application number: CN202020681005.6U
Authority: CN
Inventors: 张亚伟; 吴炎花; 王亚蒙; 徐吉林; 陈建平
Original assignee: Shanghai Electric Group Corp
Current assignee: Shanghai Electric Group Corp
Priority date: 2020-04-28
Filing date: 2020-04-28
Publication date: 2021-01-15
Anticipated expiration: 2030-04-28

Abstract

The utility model discloses a fuel cell end plate, including outer plywood and flow equalizing plate, the fluid flows through in proper order outer plywood with flow equalizing plate, be equipped with the total import of fluid on the outer plywood, be equipped with a plurality of manifold import that recess and width are different on the flow equalizing plate, it is a plurality of the manifold import with recess bottom intercommunication, the total import of fluid with the recess intercommunication, the manifold import with recess bottom intercommunication. The utility model discloses a mode that sets up the manifold import of different width improves the fluid at each manifold distribution homogeneity, does not introduce extra device that is used for the fluid distribution, simple structure, convenient implementation.

Description

Fuel cell end plate

Technical Field

The utility model relates to a fuel cell technical field, in particular to fuel cell end plate.

Background

A fuel cell is a power generation system that electrochemically converts chemical energy directly into electrical energy in a fuel cell stack, rather than converting the chemical energy of a fuel into heat by combustion. The fuel cell can be applied not only to industrial, household electric appliances and vehicles but also to power supplies of small-scale electric and electronic devices such as portable devices. The fuel cell generally has two sets of end plates, a stack structure is formed by stacking a plurality of single cells layer by layer, and the upper and lower end plates are connected together by a tie rod or a bandage to maintain the pressure of the cells in the stack. The stack typically forms one or more oxidant supply manifolds, one or more fuel supply manifolds, and one or more coolant supply manifolds in communication with an oxidant inlet, a fuel inlet, and a coolant inlet, respectively, provided on the end plate. Typically, the fuel needs to be evenly distributed to the different fuel supply manifolds. Similar oxidant needs to be distributed evenly to the different oxidant supply manifolds and coolant needs to be distributed evenly to the different coolant supply manifolds.

Patent CN 1717829a discloses a fuel cell end plate with reactant and coolant inlets on the top surface and openings on the bottom surface that communicate with the fuel cell stack manifolds. Reactants and coolant may be introduced into the end plates and may enter the fuel cell through these openings.

Patent CN 1717829a solves the problem of fluid introduction into the stack. However, in the case of a plurality of oxidant supply manifolds, or a plurality of fuel supply manifolds, or a plurality of coolant supply manifolds, the flow rate of the manifold close to the total fluid inlet is large, and the flow rate of the manifold far from the total fluid inlet is small, and the problem of flow distribution nonuniformity among the same type of manifolds is significant. The fuel oxidant is unevenly distributed, resulting in uneven current density; and the coolant is unevenly distributed, so that uneven heat dissipation is easily caused, and a large temperature difference is produced. These all in turn affect stack performance.

In view of the above, it is an urgent problem in the art to overcome the above-mentioned drawbacks of the prior art.

SUMMERY OF THE UTILITY MODEL

In order to overcome among the prior art under a plurality of oxidant supply manifold, or a plurality of fuel supply manifold, or a plurality of coolant supply manifold's the condition, the manifold flow that is close to the total import of fluid is big and the manifold flow that is far away from the total import of fluid is little, the inhomogeneous technical problem of flow distribution between the manifold of the same kind, the utility model provides a under a plurality of oxidant supply manifold, or a plurality of fuel supply manifold, or a plurality of coolant supply manifold's the condition, guarantee the even fuel cell end plate of flow distribution between the manifold of the same kind.

In order to achieve the purpose, the utility model discloses a fuel cell end plate, including outer plywood and flow equalizing plate, the fluid flows through in proper order the outer plywood with flow equalizing plate, be equipped with the total import of fluid on the outer plywood, be equipped with recess and a plurality of manifold import on the flow equalizing plate, the total import of fluid with the recess intercommunication is a plurality of the manifold import with recess bottom intercommunication.

Further, the ratio of the thickness of the flow equalizing plate to the depth of the groove is not less than 1.5.

Further, the distance between adjacent manifold inlets is the same.

Further, the manifold inlets are symmetrically distributed along the axis of the total fluid inlet, at least 1 manifold inlet corresponds to the total fluid inlet, and the width of the manifold inlet is gradually reduced from the position close to the axis of the total fluid inlet to the position far away from the axis of the total fluid inlet.

Further, the width ratio of adjacent manifold inlets is not greater than 1.5 and not less than 1.1.

The utility model provides a fuel cell end plate improves the fluid at each manifold distribution homogeneity through the mode that sets up the manifold import of different width, does not introduce extra device that is used for the fluid distribution, simple structure, convenient implementation.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the apparatus and method in accordance with the invention and, together with the detailed description, serve to explain the advantages and principles of the invention. In the drawings:

fig. 1 is a schematic structural view of a fuel cell end plate.

Description of the reference numerals

1-outer laminate

2-flow equalizing plate

3-fluid general inlet

4-manifold inlet

41-first manifold Inlet

42-second manifold inlet

43-third manifold Inlet

44-fourth manifold inlet

45-fifth manifold inlet

5-inside of the pile

6-groove

E-manifold inlet width

E1-first manifold Inlet Width

E2-second manifold Inlet Width

E3-third manifold Inlet Width

E4-fourth manifold Inlet Width

E5-fifth manifold Inlet Width

D-total fluid inlet width

H-outer skin thickness

f-groove depth

h-thickness of flow equalizing plate

L-distance of adjacent manifold inlets

Detailed Description

The following detailed description of the embodiments of the present invention refers to the accompanying drawings. However, the present invention is not limited to the embodiments described below. In addition, the technical features related to the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other, and the technical idea of the present invention may be combined with other known techniques or other techniques similar to those known techniques.

As shown in fig. 1, a fuel cell end plate comprises an outer plate 1 and a flow equalizing plate 2, wherein a fluid flows through the outer plate 1 and the flow equalizing plate 2 in sequence, a sealing ring is arranged between the outer plate 1 and the flow equalizing plate 2 to prevent the fluid from leaking, and the fluid comprises fuel, oxidant or coolant.

The outer plate 1 is provided with a main fluid inlet 3, the flow equalizing plate 2 is provided with a groove 6, one end of the main fluid inlet 3 is connected with an external fluid pipeline, the other end of the main fluid inlet 3 is communicated with the groove 6, the thickness of the flow equalizing plate 2 is h, the depth of the groove 6 is f, and the value of h/f is not less than 1.5. The flow equalizing plate 2 is also provided with a plurality of manifold inlets 4 with different widths, and the cross sections of the manifold inlets 4 are circular. One end of each manifold inlet 4 is communicated with the inside 5 of the galvanic pile, and the other end of each manifold inlet is communicated with the bottom of the groove 6.

The arrangement of the manifold inlets 4 on the flow equalizing plate 2 is as follows: wherein the first manifold inlet 41 corresponds to the fluid inlet 3 and the

other manifold inlets

42, 43, 44, 45 are symmetrically distributed along the axis of the fluid inlet 3, and the distance L between all adjacent manifold inlets 4 is the same.

In the above case, the manifold inlet 4 is singular, and when the manifold inlet 4 is even, the manifold inlet 4 is arranged on the flow equalizing plate 2 in the following manner: at least 2 manifold inlets 4 correspond to the fluid inlet 3, and the other manifold inlets 4 are symmetrically distributed along the axis of the fluid inlet 3.

Furthermore, the width E of the manifold inlets 4 may vary, with manifold inlets 4 closer to the manifold inlet 3 having a smaller width and manifold inlets 4 further from the manifold inlet 3 having a larger width, e.g. E1 < E2 ═ E3 < E4 ═ E5. Further, the width ratio of the adjacent manifold inlets 4 is not more than 1.5 and not less than 1.1.

Compared with the prior art, the utility model provides a fuel cell end plate improves the fluid at each manifold distribution homogeneity through the mode that sets up the manifold import of different width, does not introduce extra device that is used for the fluid distribution, simple structure, convenient implementation.

The terms "first" and "second" as used herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another, unless otherwise specified. Similarly, modifiers similar to "about", "approximately" or "approximately" that occur before a numerical term herein typically include the same number, and their specific meaning should be read in conjunction with the context. Similarly, unless a specific number of a claim recitation is intended to cover both the singular and the plural, and also that claim may include both the singular and the plural.

In the description of the specific embodiments above, the use of the directional terms "upper", "lower", "left", "right", "top", "bottom", "vertical", "transverse", and "lateral", etc., are for convenience of description only and should not be considered limiting.

Although particular embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are examples only and that the scope of the present invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are all within the scope of the invention.

Claims

1. A fuel cell end plate is characterized by comprising an outer plate and a flow equalizing plate, wherein fluid sequentially flows through the outer plate and the flow equalizing plate, a main fluid inlet is formed in the outer plate, a groove and a plurality of manifold inlets are formed in the flow equalizing plate, the main fluid inlet is communicated with the groove, and the manifold inlets are communicated with the bottom of the groove.

2. The fuel cell end plate of claim 1, wherein a ratio of a thickness of the flow equalizing plate to a depth of the groove is not less than 1.5.

3. The fuel cell end plate of claim 1, wherein the distance between adjacent manifold inlets is the same.

4. The fuel cell end plate of claim 3, wherein the manifold inlets are symmetrically distributed along the common fluid inlet axis and at least 1 manifold inlet corresponds to the common fluid inlet, the manifold inlets tapering in width from proximate the common fluid inlet axis to distal the common fluid inlet axis.

5. The fuel cell end plate of claim 4, wherein a width ratio of adjacent manifold inlets is not greater than 1.5 and not less than 1.1.