Bipolar plate with buffer mixing structure in flow field

Abstract

The utility model discloses a bipolar plate with a buffer mixing structure in a flow field, relates to the technical field of hydrogen fuel cells, and can solve the problem of non-uniform gas reaction degree of each flow channel in the existing flow field. The bipolar plate with the buffer mixed structure in the flow field comprises a plate body, the flow field area of the plate body is provided with a plurality of linear flow channels which are arranged at intervals and are parallel to the length direction of the plate body and buffer grooves formed in the flow field area, and at least two linear flow channels are communicated through the buffer grooves.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydrogen fuel cell technical field, concretely relates to a bipolar plate with buffer mixing structure in flow field. BACKGROUND

[0002] The bipolar plate is one of the core components of the hydrogen fuel cell, and the bipolar plate, membrane electrode and sealing ring can form a single cell unit of the hydrogen fuel cell system. Therefore, the total power generation efficiency of the hydrogen fuel cell system depends on the power generation efficiency of the single cell unit of the hydrogen fuel cell system.

[0003] The bipolar plate has an important influence on the power generation efficiency of the single cell unit. For example, the flow field design, heat dissipation efficiency, strength requirement of the bipolar plate and the bipolar plate resistance value caused by material selection all affect the power generation efficiency of the single cell unit. At present, the flow channel cross section of the flow field design of the bipolar plate is generally U-shaped or rectangular, and a plurality of flow channels are arranged side by side at intervals. After the gas enters the flow channels of the flow field, it is catalytically reacted. However, in order to control the flow rate of the gas in the flow channel, the flow channel is usually designed to be bent multiple times. The reaction rates of the gas in each region of the flow field are not synchronized, and since each flow channel is relatively independent, the gas is usually difficult to mix and distribute before flowing out of the flow field, which affects the reaction efficiency of the single cell unit.

[0004] Based on the above background, the inventor designs a bipolar plate with buffer mixing structure in the flow field to solve at least one of the above problems, thereby proposing the present application. UTILITY MODEL CONTENTS

[0005] The purpose of the present application is to provide a bipolar plate with buffer mixing structure in the flow field to solve the problem of uneven gas reaction degree in each flow channel of the existing flow field.

[0006] To solve the above technical problems, the present application adopts the following scheme:

[0007] The present application provides a bipolar plate with buffer mixing structure in the flow field, which comprises a plate body, a plurality of straight-line flow channels arranged in parallel to the length direction of the plate body and arranged at intervals in the flow field area of the plate body, and a buffer groove arranged in the flow field area, and at least two straight-line flow channels are communicated through the buffer groove.

[0008] Optionally, a plurality of flow resistance protrusions are arranged in the buffer groove, and the flow resistance protrusions are distributed at the gas inlet end of the straight-line flow channel along the gas flow direction, and the top height of the flow resistance protrusion is higher than the bottom height of the straight-line flow channel.

[0009] Optionally, the cross-sectional shape of the flow resistance protrusion is any one of a circle, a semicircle and an ellipse.

[0010] Optionally, the top height of the flow blocking protrusion is lower than the top height of the linear flow channel, and the cross-sectional width of the flow blocking protrusion is 0.5 to 0.9 times the width of the linear flow channel.

[0011] Optionally, the bottom depth of the buffer groove is lower than the bottom depth of the linear flow channel.

[0012] The cross-sectional shape of the buffer groove is any one of a U shape or a rectangle.

[0013] Optionally, the buffer groove is arranged throughout the flow field area, and the linear flow channels in the flow field area are connected to each other through the buffer groove.

[0014] Optionally, the length direction of the buffer groove is parallel to the width direction of the plate body.

[0015] Optionally, a plurality of buffer grooves are arranged in the flow field area of the plate body, and the plurality of buffer grooves are uniformly distributed along the length direction of the plate body.

[0016] Optionally, a plurality of linear flow ridges are arranged in the flow field area of the plate body, and the linear flow channels are arranged in the linear flow ridges.

[0017] Optionally, the linear flow channels on both sides of the buffer groove are arranged in a staggered manner along the airflow direction.

[0018] The beneficial effects of the present application are as follows:

[0019] Firstly, the present application sets a buffer groove in the flow field area of the plate body, and at least two linear flow channels are connected through the buffer groove, so that after the gas enters the linear flow channel from the gas hole of the plate body, the gas can enter the buffer groove after flowing for a distance. At this time, the gas in the plurality of linear flow channels after the reaction enters the buffer groove for buffering and mixing, and then enters the next linear flow channel, so that the gas entering the linear flow channel of the flow field can be buffered and mixed again through the buffer groove, which can effectively solve the problem that the reaction degree of the gas in each flow channel is not uniform due to the separation of each flow channel in the prior art, thereby affecting the reaction efficiency.

[0020] Secondly, the present application sets a flow blocking protrusion in the buffer groove, so that the gas flowing into the buffer groove can be blocked by the flow blocking protrusion, avoiding the gas directly entering the next linear flow channel, and improving the buffering and moderating effect of the buffer groove on the gas in each flow channel. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a top view structure diagram of the prior art bipolar plate.

[0022] Figure 2It is a top view structural schematic diagram of the embodiment of the present application.

[0023] Figure 3 It is Figure 2 It is a sectional view structural schematic diagram of A-A in the figure.

[0024] Reference signs: 1-plate body, 101-hydrogen hole, 11-linear flow ridge, 12-linear flow channel, 13-buffer groove, 14-resistance flow protrusion. DETAILED DESCRIPTION

[0025] The utility model will be further explained in detail in combination with embodiments and drawings, but the implementation mode of the utility model is not limited to this.

[0026] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom" and the like is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship commonly placed when the utility model product is used, and is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the utility model.

[0027] In the description of the utility model, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "set", "open", "install", "connect", "connect" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrally connected, can be mechanically connected, or can be electrically connected, can be directly connected, or indirectly connected through an intermediate medium, or can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0028] The utility model will be further explained in detail in combination with embodiments and drawings, but the implementation mode of the utility model is not limited to this.

[0029] As Figure 2 And Figure 3 As shown in the figure, the embodiment provides a bipolar plate with a buffer mixing structure in a flow field, comprising a plate body 1, the flow field area of the plate body 1 is provided with a plurality of linear flow channels 12 spaced and parallel to the length direction of the plate body 1, and a buffer groove 13 is arranged in the flow field area, and at least two linear flow channels 12 are communicated through the buffer groove 13.

[0030] Referring to Figure 1As shown, in the present embodiment, the existing bipolar plate is usually provided with a plurality of hole structures, wherein the corresponding hydrogen or oxygen port is usually arranged at the diagonal. In the entire flow field area design, the flow channel needs to be bent at least twice. In order to make the flow channel as much as possible to cover the flow field area, in many existing designs, the single flow channel needs to be bent more times to try to improve the gas reaction effect. However, in the current flow channel design, the flow channels are usually in a relatively independent state. After the gas enters the flow channel from the gas hole into the flow field area, it is difficult to mix and distribute with the gas in other flow channels, resulting in that the gas reaction degree in each flow channel is often not uniform.

[0031] The present embodiment is characterized in that a buffer groove 13 is arranged in the flow field area of the plate body 1, and at least two straight flow channels 12 are communicated through the buffer groove 13, so that after the gas enters the straight flow channel 12 from the gas hole of the plate body 1, it can flow for a distance and then enter the buffer groove 13. At this time, the gas in the plurality of straight flow channels 12 after the reaction enters the buffer groove 13 for buffering and mixing, and then enters the next straight flow channel 12, so that after the gas enters the straight flow channel 12 of the flow field, it can also be buffered and mixed through the buffer groove 13, which can effectively solve the problem that in the prior art, due to the separation of each flow channel, the gas reaction degree in each flow channel may be uneven, thereby affecting the reaction efficiency.

[0032] Specifically, in the present embodiment, as shown in Figure 2 and Figure 3 The buffer groove 13 is also provided with a plurality of flow blocking protrusions 14, which are distributed at the gas inlet end of the straight flow channel 12 along the gas flow direction, and the top height of the flow blocking protrusion 14 is higher than the bottom height of the straight flow channel 12. By arranging the flow blocking protrusion 14, the gas flowing into the buffer groove 13 can be blocked by the flow blocking protrusion 14, avoiding the gas directly entering the next straight flow channel 12, and improving the buffering and moderating effect of the buffer groove 13 on the gas in each flow channel.

[0033] Specifically, in the present embodiment, the cross-sectional shape of the flow blocking protrusion 14 is circular, and the cross-sectional shape of the flow blocking protrusion 14 can be semicircular or elliptical according to the needs of the technicians, which will not be described here.

[0034] Specifically, in the present embodiment, the top height of the flow blocking protrusion 14 is lower than the top height of the straight flow channel 12, and the cross-sectional width of the flow blocking protrusion 14 and the width of the straight flow channel 12 are in a ratio of 0.5. If the proportion of the flow blocking protrusion 14 to the width of the straight flow channel 12 is too large, it is easy to cause the flow rate to be too low, and vice versa.

[0035] Specifically, in the present embodiment, the bottom depth of the buffer groove 13 is lower than the bottom depth of the straight flow channel 12.

[0036] The buffer groove 13 has a U-shaped cross-section. Technicians can also set the cross-sectional shape of the buffer groove 13 to a rectangle, V-shape, or other shapes, which will not be elaborated here.

[0037] Specifically, in this embodiment, as Figure 2 As shown, the buffer tank 13 is set throughout the entire flow field area, and all the straight flow channels 12 in the flow field area are interconnected through the buffer tank 13, so that the straight flow channels 12 in the entire flow field area can buffer and mix the gas, thereby improving the buffering and mixing effect of the gas.

[0038] Specifically, in this embodiment, as Figure 2 As shown, the length direction of the buffer groove 13 is parallel to the width direction of the plate 1, so that the lengths of each straight flow channel 12 are relatively consistent.

[0039] Specifically, in this embodiment, as Figure 2 As shown, multiple buffer grooves 13 are provided in the flow field area of ​​the plate 1. The multiple buffer grooves 13 are evenly distributed along the length direction of the plate 1. The provision of multiple buffer grooves 13 can improve the buffering and gas mixing effect.

[0040] Specifically, in this embodiment, as Figure 2 As shown, the flow field area of ​​the plate 1 is also provided with a number of straight flow ridges 11 that are spaced apart and parallel to the length direction of the plate 1, and the straight flow channels 12 are spaced apart by the straight flow ridges 11.

[0041] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of this utility model, and the utility model is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of this utility model, and these modifications and improvements are also considered to be within the protection scope of this utility model.

Claims

1. A bipolar plate having a buffer mixing structure in a flow field, comprising a plate body (1), characterized in that, The flow field area of the plate body (1) is provided with a plurality of linear flow channels (12) arranged in parallel to the length direction of the plate body (1) at intervals, and a buffer groove (13) arranged in the flow field area.

2. The bipolar plate having a buffer mixing structure in a flow field according to claim 1, wherein, The buffer groove (13) is further provided with a plurality of flow resistance protrusions (14), the flow resistance protrusions (14) are distributed at the gas inlet end of the linear flow channel (12) along the gas flow direction, and the top height of the flow resistance protrusions (14) is higher than the bottom height of the linear flow channel (12).

3. The bipolar plate having a buffer mixing structure in a flow field according to claim 2, wherein The cross-sectional shape of the flow resistance protrusion (14) is any one of a circle, a semicircle, and an ellipse.

4. The bipolar plate having a buffer mixing structure in a flow field according to claim 2, wherein The top height of the flow resistance protrusion (14) is lower than the top height of the linear flow channel (12), and the cross-sectional width of the flow resistance protrusion (14) and the width of the linear flow channel (12) are in a ratio of 0.5 to 0.

9.

5. The bipolar plate having a buffer mixing structure in a flow field according to claim 1, wherein The bottom depth of the buffer groove (13) is lower than the bottom depth of the linear flow channel (12). The cross-sectional shape of the buffer groove (13) is any one of a U shape and a rectangle.

6. The bipolar plate having a buffer mixing structure in a flow field according to claim 1, wherein The buffer groove (13) is arranged through the entire flow field area, and the linear flow channels (12) in the flow field area are connected to each other through the buffer groove (13).

7. The bipolar plate having a buffer mixing structure in a flow field according to claim 6, wherein The length direction of the buffer groove (13) is parallel to the width direction of the plate body (1).

8. The bipolar plate having a buffer mixing structure in a flow field according to claim 1, wherein The flow field area of the plate body (1) is provided with a plurality of buffer grooves (13) arranged at intervals, and the buffer grooves (13) are uniformly distributed along the length direction of the plate body (1).

9. The bipolar plate having a buffer mixing structure in a flow field according to claim 1, wherein The flow field area of the plate body (1) is further provided with a plurality of linear flow ridges (11) arranged in parallel to the length direction of the plate body (1) at intervals, and the linear flow channels (12) are arranged at intervals through the linear flow ridges (11).

10. The bipolar plate having a buffer mixing structure in a flow field according to claim 1, wherein The linear flow channels (12) on both sides of the buffer groove (13) are arranged in a staggered manner along the gas flow direction.

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