阅读说明：本技术 一种提高燃料电池温度均匀性的金属极板 (Metal polar plate for improving temperature uniformity of fuel cell ) 是由 杜谦 龚兴军 胡玉凤 于 2020-03-30 设计创作，主要内容包括：一种提高燃料电池温度均匀性的金属极板,适用于空冷燃料电池的极板,通过折弯或者冲压工艺成型,极板宽度大于膜电极宽度2～30mm,通过装堆压力或激光焊接或胶粘固定于膜电极与相邻单电池的极板之间,极板凸起部分顶面及侧壁开有通孔。有益效果是：提高流道进口温度,降低出口温度,降低整体温度,减小温度梯度,提高温度均匀性,利于水汽排出,从而提升燃料电池性能；带孔薄金属板制成的极板,既可以减小体积,也可以减小质量,提高燃料电池体积功率密度和质量功率密度,还能辅助散热和排水。(A metal polar plate for improving the temperature uniformity of a fuel cell is suitable for a polar plate of an air-cooled fuel cell, is formed by a bending or stamping process, has a polar plate width larger than the width of a membrane electrode by 2-30 mm, is fixed between the membrane electrode and the polar plate of an adjacent single cell by stacking pressure or laser welding or gluing, and is provided with through holes on the top surface and the side wall of a convex part of the polar plate. The beneficial effects are that: the inlet temperature of the flow channel is increased, the outlet temperature is reduced, the overall temperature is reduced, the temperature gradient is reduced, the temperature uniformity is improved, and the discharge of water vapor is facilitated, so that the performance of the fuel cell is improved; the polar plate made of the thin metal plate with the holes can reduce the volume and the mass, improve the volume power density and the mass power density of the fuel cell, and assist in heat dissipation and water drainage.)

1. The utility model provides an improve fuel cell temperature homogeneity's metal polar plate, is applicable to air cooling fuel cell's polar plate which characterized in that: the width of the metal polar plate (1) is 2-30 mm larger than that of the membrane electrode (2), the metal polar plate is formed through bending or punching technology to form a concave-convex structure, a flow channel (4) is formed between two adjacent convex parts (3) of the concave-convex structure, the width of the flow channel is 1.5-2.5 mm, the depth of the flow channel is 1-2 mm, the width of the convex part is 1.5-2 mm, and the height of the convex part is 1-2 mm.

2. The metal plate for improving the temperature uniformity of a fuel cell as claimed in claim 1, wherein the metal plate has a thickness of 0.08-1.5 mm, is made of pure titanium, titanium alloy or stainless steel, and has a graphite-like carbon (G L C), carbon nitride (TiN) or conductive ceramic Ti3SiC2 coating on the surface.

3. The metal plate of claim 1 for improving temperature uniformity of a fuel cell, wherein: the metal polar plate is provided with through holes (5), the aperture of each through hole is 0.5-1 mm, the distance between the outer edges of the through holes is 0.5-1 mm, and the through holes are located on the top surface (6) of the convex part of the polar plate and the side walls (7) on the two sides.

4. The metal plate of claim 1 for improving temperature uniformity of a fuel cell, wherein: the position relation between the metal polar plate (1) and the membrane electrode (2) can be center coincidence, namely the left side and the right side of the polar plate exceed the width of the membrane electrode, and can also be non-center coincidence, namely the left side and the right side of the polar plate exceed the width of the membrane electrode, and the sizes are not equal.

5. The metal plate of claim 1 for improving temperature uniformity of a fuel cell, wherein: the top surface (6) of the convex part of the metal polar plate is tightly contacted with the membrane electrode, the bottom (8) is tightly contacted with the polar plate of the adjacent monocell, and the fixing is realized by stacking pressure or laser welding or gluing.

Technical Field

The invention belongs to the technical field of fuel cells, and particularly relates to a polar plate suitable for an air-cooled fuel cell.

Background

The polar plate of the air-cooled fuel cell is mostly formed by graphite carving or metal sheet stamping, and the common designs include a parallel flow field, a serpentine flow field, an interdigitated flow field and the like. The performance of the fuel cell is closely related to the uniformity of temperature distribution, and the fuel cell with uniform temperature distribution has better performance.

Disclosure of Invention

The invention aims to provide a metal polar plate for improving the temperature uniformity of a fuel cell, which overcomes the defects of the existing polar plate. The technical scheme of the invention is as follows: the utility model provides an improve fuel cell temperature homogeneity's metal polar plate, is applicable to air cooling fuel cell's polar plate which characterized in that: the width of the metal polar plate is 2-30 mm larger than that of the membrane electrode, the metal polar plate is formed through bending or stamping technology to form a concave-convex structure, a flow channel is formed between two adjacent convex parts of the concave-convex structure, the width of the flow channel is 1.5-2.5 mm, the depth of the flow channel is 1-2 mm, the width of the convex part is 1.5-2 mm, and the height of the convex part is 1-2 mm.

The invention relates to a metal pole plate for improving the temperature uniformity of a fuel cell, which is characterized in that the thickness of the metal pole plate is 0.08-1.5 mm, the material of the metal pole plate comprises pure titanium, titanium alloy or stainless steel, and the surface of the metal pole plate is provided with a graphite-like carbon (G L C), carbon nitride (TiN) or conductive ceramic Ti3SiC2 coating.

The invention relates to a metal polar plate for improving the temperature uniformity of a fuel cell, which is characterized in that: the metal polar plate is provided with through holes, the aperture is 0.5-1 mm, the distance between the outer edges of the holes is 0.5-1 mm, and the through holes are located on the top surface and the side walls on two sides of the convex part of the polar plate.

The invention relates to a metal polar plate for improving the temperature uniformity of a fuel cell, which is characterized in that: the position relation between the metal polar plate and the membrane electrode can be center coincidence, namely the left side and the right side of the polar plate exceed the width of the membrane electrode, or non-center coincidence, namely the left side and the right side of the polar plate exceed the width of the membrane electrode, and the sizes are not equal.

The invention relates to a metal polar plate for improving the temperature uniformity of a fuel cell, which is characterized in that: the top surface of the convex part of the metal polar plate is tightly contacted with the membrane electrode, the bottom of the convex part of the metal polar plate is tightly contacted with the polar plate of the adjacent monocell, and the metal polar plate is fixed by stacking pressure or laser welding or gluing.

The invention has the beneficial effects that:

1. the design that the width of the polar plate exceeds the width of the membrane electrode is equivalent to additionally increasing the heat dissipation area, and simultaneously, the preheating function is also realized on the cold air at the inlet, so that the temperature uniformity of the fuel cell can be obviously improved, namely, the temperature gradient of the corresponding membrane electrode area is reduced from the inlet to the outlet along the flow channel direction, the inlet temperature is increased, the outlet temperature is reduced, the highest temperature is reduced, the overall temperature is reduced, more effective areas of the membrane electrode work near the ideal temperature, and the performance is better;

2. the thin metal plate can reduce the thickness of a single cell on the premise of ensuring the supporting strength, thereby reducing the volume of the pile and improving the volume power density;

3. the thin metal plate with the holes can reduce the quality of a single cell on the premise of ensuring the supporting strength, thereby reducing the quality of the pile and improving the quality power density;

4. the thin metal plate with the holes can enhance heat dissipation, is beneficial to uniform temperature distribution of the galvanic pile, is beneficial to diffusion of generated water vapor and liquid water, and is beneficial to improving performance.

Brief Description of Drawings

Fig. 1 is a schematic diagram showing the relationship between the metal plate and the membrane electrode according to the present invention, which improves the temperature uniformity of the fuel cell, and the top view thereof.

In the figure, 1, a polar plate; 2. and a membrane electrode.

Fig. 2 is a schematic structural diagram, side view, of a metal plate for improving temperature uniformity of a fuel cell according to the present invention.

In the figure, 3. convex part; 4. a flow channel; 5. a through hole; 6. a convex portion top surface; 7. a raised portion sidewall; 8. the bottom of the polar plate.

Fig. 3 is a distribution diagram of the membrane electrode temperature along the flow channel direction after using the metal plate of the present invention to improve the temperature uniformity of the fuel cell.

In the figure, 9. temperature distribution when the plate and the membrane electrode are as wide; 10. the temperature distribution when the width of the polar plate is larger than the width of the membrane electrode.

Fig. 4 is a schematic diagram, an anatomical diagram, showing the relationship between the metal plate and the membrane electrode for improving the temperature uniformity of the fuel cell according to the present invention.

In the figure, 11. the part of the plate width beyond the membrane electrode width.

Detailed Description

The polar plate is formed by a metal sheet with a through hole through a bending process; the metal material is pure titanium TA1, and the surface is plated with a titanium nitride coating; the thickness of the metal sheet is 0.1mm, the diameter of the through hole on the sheet is 0.8mm, and the distance between the outer edges of the holes is 0.5 mm; the height of the convex part is 1.5mm, the width of the convex part is 2mm, the depth of the runner is 1.5mm, and the width of the runner is 1.5 mm. The width of the polar plate is 60mm, the width of the membrane electrode is 50mm, the polar plate is superposed with the center of the membrane electrode, namely the left side and the right side of the polar plate are 5mm wider than the membrane electrode respectively.