Electrode plate for fuel cell and fuel cell thereof

Abstract

The invention relates to an electrode plate for a fuel cell and the fuel cell thereof. The electrode plate comprises a substrate with at least one main acting plane, wherein at least one flow channel is arranged on the substrate, and a plurality of diversion projections staggeredly extend out of the two side walls of at least one flow channel at intervals; and a gap is formed between each diversion projection and the other side wall. Further, each diversion projection has a front curved surface, a back curved surface and a top surface, the front curved surface is arranged towards the converse direction of reaction flow, and the back curved surface is arranged towards the same direction of the reaction flow. Further, the front curved surface is of a concave surface, and the back curved surface is of a convex surface. Through the diversion projections, when the reaction flow passes through the diversion projections, the pressure of the reaction flow can be effectively increased, thereby not only improving the effect that the reaction flow penetrates the breathable layer of a membrane electrode assembly and effectively improving the distribution of the reaction flow, but also preventing the large block aggregation phenomenon generated by the reaction, and improving the reliability of the fuel cell.

Description

technical field

[0001] The invention belongs to the technical field of fuel cells, in particular to a polar plate of a fuel cell and a fuel cell thereof. Background technique

[0002] Fuel cells are considered to be a new type of power source and energy converter with multiple uses. There are quite a few different types of fuel cells, one of which is called a proton exchange membrane fuel cell (PEMFC). PEMFC is mainly designed as a stack of bipolar plates and a membrane electrode assembly (MEA) sandwiched between the bipolar plates. There are various types of flow fields on the bipolar plates to deliver the reaction flow to the reaction interface on the MEA and discharge it in the PEMFC. excess heat and water generated by electrochemical reactions in the Years of practice have shown that there are many deficiencies in the design of bipolar plates, such as the distribution efficiency of the reacting flow, heat and water management, and so on. Despite years of effort, these...

Examples

Embodiment 1

[0024] Such as figure 1 As shown, a pole plate for a fuel cell includes:

[0025] a substrate 1 having at least one main active surface;

[0026] The substrate 1 is provided with at least one flow channel 2, figure 1 There are multiple flow channels 2 on the middle base plate, image 3 There is only one flow channel 2 on the middle base plate;

[0027] On the two side walls of at least one flow channel 2 , a plurality of flow guide protrusions 3 are extended in staggered intervals, and there is a gap between each flow guide protrusion 3 and the other side wall 2 .

[0028] Wherein, each of the guide bumps 3 can be designed in various shapes, and the disturbance of the reaction can be realized through the guide bumps 3, so as to increase the local pressure of the flow channel and make it easier for the reaction flow to penetrate the membrane electrode assembly. The air-permeable layer realizes the great improvement of the electrochemical efficiency of the fuel cell. Moreov...

Embodiment 2

[0038] A fuel cell, including a pole plate and a gas-permeable layer:

[0039] Using the polar plate described in Embodiment 1;

[0040] The active surface of the substrate of the pole plate is pressed on the air-permeable layer to form a boundary element;

[0041] The top surface of the diversion bump 3 of the polar plate is pressed on the boundary element;

[0042] The plurality of flow channels of the polar plate are formed between the flow guide bumps 3 of the polar plate and the space between the substrate 1 of the polar plate and the boundary elements.

[0043] Such as Figure 4 As shown, the reaction flow in the flow channel 2 often hits the front curved surface 31 of the flow guide protrusion 3 on the substrate 1, so that the reaction flow is forced to find all other possible forward flow paths, due to the local fluid pressure and With the change of velocity, the reaction flow is also pressed on the air-permeable layer 4 to find a path to move forward. Therefore, t...

technical field

[0001] The invention belongs to the technical field of fuel cells, in particular to a polar plate of a fuel cell and a fuel cell thereof. Background technique

[0002] Fuel cells are considered to be a new type of power source and energy converter with multiple uses. There are quite a few different types of fuel cells, one of which is called a proton exchange membrane fuel cell (PEMFC). PEMFC is mainly designed as a stack of bipolar plates and a membrane electrode assembly (MEA) sandwiched between the bipolar plates. There are various types of flow fields on the bipolar plates to deliver the reaction flow to the reaction interface on the MEA and discharge it in the PEMFC. excess heat and water generated by electrochemical reactions in the Years of practice have shown that there are many deficiencies in the design of bipolar plates, such as the distribution efficiency of the reacting flow, heat and water management, and so on. Despite years of effort, these...

Examples

Embodiment 1

[0024] Such as figure 1 As shown, a pole plate for a fuel cell includes:

[0025] a substrate 1 having at least one main active surface;

[0026] The substrate 1 is provided with at least one flow channel 2, figure 1 There are multiple flow channels 2 on the middle base plate, image 3 There is only one flow channel 2 on the middle base plate;

[0027] On the two side walls of at least one flow channel 2 , a plurality of flow guide protrusions 3 are extended in staggered intervals, and there is a gap between each flow guide protrusion 3 and the other side wall 2 .

[0028] Wherein, each of the guide bumps 3 can be designed in various shapes, and the disturbance of the reaction can be realized through the guide bumps 3, so as to increase the local pressure of the flow channel and make it easier for the reaction flow to penetrate the membrane electrode assembly. The air-permeable layer realizes the great improvement of the electrochemical efficiency of the fuel cell. Moreov...

Embodiment 2

[0038] A fuel cell, including a pole plate and a gas-permeable layer:

[0039] Using the polar plate described in Embodiment 1;

[0040] The active surface of the substrate of the pole plate is pressed on the air-permeable layer to form a boundary element;

[0041] The top surface of the diversion bump 3 of the polar plate is pressed on the boundary element;

[0042] The plurality of flow channels of the polar plate are formed between the flow guide bumps 3 of the polar plate and the space between the substrate 1 of the polar plate and the boundary elements.

[0043] Such as Figure 4 As shown, the reaction flow in the flow channel 2 often hits the front curved surface 31 of the flow guide protrusion 3 on the substrate 1, so that the reaction flow is forced to find all other possible forward flow paths, due to the local fluid pressure and With the change of velocity, the reaction flow is also pressed on the air-permeable layer 4 to find a path to move forward. Therefore, t...

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