Fuel cell stack

Abstract

The utility model discloses a fuel cell stack, include: upper end board, lower end board and a plurality of between upper end board, lower end board and alternately stacked bipolar plate, proton exchange membrane, at least 2 interval setting metal band fastening in upper end board, lower end board and a plurality of bipolar plate, proton exchange membrane periphery, first metal cushion block, second metal cushion block of the bipolar plate are arranged in the both ends of air cooling plate along the length direction respectively, first metal cushion block, second metal cushion block are located between air cooling plate and anode plate or cathode plate, and first metal cushion block, second metal cushion block have first pin, second pin respectively, first metal cushion block and anode plate, cathode plate are connected through first carbon paper, second carbon paper respectively, second metal cushion block and anode plate, cathode plate are connected through third carbon paper, fourth carbon paper respectively. The utility model discloses fuel cell stack can understand the performance of battery stack in time to, thereby convenient monitoring and maintenance, also has improved power generation efficiency.

Description

Technical Field

[0001] This utility model relates to the field of fuel cell technology, and in particular to a fuel cell stack. Background Technology

[0002] A hydrogen fuel cell is an electrochemical power generation device that converts chemical energy into electrical energy. A single cell consists of electrodes, a membrane electrode assembly (MEA), and corresponding sealing components. Hydrogen gas flows through channels in the electrodes and undergoes an oxidation reaction on one side of the MEA, while a reduction reaction occurs on the other side. This entire process creates an electron flow in the external circuit, thereby generating electricity. The entire process is pollution-free, emission-free, and the only byproduct is water, making it a clean energy conversion device. Therefore, it has received attention and importance from various countries and has become a research hotspot, currently widely used. Fuel cell stacks are typically composed of multiple stacked fuel cells. However, the power generation efficiency of existing fuel cell stacks needs improvement, and the performance of the cells is not easily monitored. Summary of the Invention

[0003] The purpose of this invention is to provide a fuel cell stack that allows for timely monitoring and maintenance of the stack's performance, thereby improving power generation efficiency.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a fuel cell stack, comprising: an upper end plate, a lower end plate, and a plurality of bipolar plates and proton exchange membranes alternately stacked between the upper end plate and the lower end plate; at least two spaced metal strips are fastened to the periphery of the upper end plate, the lower end plate, and the plurality of bipolar plates and proton exchange membranes; the bipolar plates include an anode plate, a cathode plate, and an air cooling plate located between the anode plate and the cathode plate; each of the anode plate and the cathode plate has a hydrogen inlet and a reaction air inlet at one end, and a hydrogen outlet and a reaction air outlet at the other end; the air cooling plate has a cooling air inlet on one side and a cooling air outlet on the other side. The anode plate has a plurality of first grooves on the surface opposite to the air cooling plate, and adjacent first grooves are separated by first ridges. The cathode plate has a plurality of second grooves on the surface opposite to the air cooling plate, and adjacent second grooves are separated by second ridges. A first metal pad and a second metal pad are respectively disposed at both ends of the air cooling plate along its length. The first metal pad and the second metal pad are located between the air cooling plate and the anode plate or the cathode plate, and the first metal pad and the second metal pad have a first lead and a second lead, respectively. The first metal pad is connected to the anode plate and the cathode plate through a first carbon paper and a second carbon paper, respectively, and the second metal pad is connected to the anode plate and the cathode plate through a third carbon paper and a fourth carbon paper, respectively.

[0005] The following are further improvements to the above technical solution: 1. In the above scheme, the area of ​​the metal strip facing the upper end plate or the lower end plate has a protrusion, which contacts the upper end plate or the lower end plate.

[0006] 2. In the above scheme, the first metal pad and the second metal pad are located between the air cooling plate and the anode plate.

[0007] 3. In the above scheme, the first pin is located in the region of the first metal pad near the reaction air inlet, and the second pin is located in the region of the second metal pad near the reaction air outlet.

[0008] 4. In the above scheme, the first pin and the second pin are arranged diagonally.

[0009] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art: This utility model relates to a fuel cell stack, in which a first metal pad and a second metal pad are respectively disposed at both ends of the air cooling plate along its length. The first metal pad and the second metal pad are located between the air cooling plate and the anode plate or cathode plate, and the first metal pad and the second metal pad are respectively provided with a first pin and a second pin, which can be used to detect the battery performance and understand the performance of the fuel cell in a timely manner, thereby facilitating monitoring and maintenance. In addition, the first metal pad is connected to the anode plate and the cathode plate respectively through a first carbon paper and a second carbon paper, and the second metal pad is connected to the anode plate and the cathode plate respectively through a third carbon paper and a fourth carbon paper, which reduces the contact resistance between the anode plate, the air cooling plate and the cathode plate and improves the power generation efficiency. Attached Figure Description

[0010] Appendix Figure 1 This is a three-dimensional structural diagram of the fuel cell stack of this utility model; Appendix Figure 2 This is a top view of the bipolar plate of this utility model. Appendix Figure 3 This is a bottom view of the bipolar plate of this utility model. Appendix Figure 4 This is an exploded structural diagram of the bipolar plate of this utility model.

[0011] In the above figures: 1. Anode plate; 2. Cathode plate; 3. Air cooling plate; 41. Hydrogen inlet; 42. Hydrogen outlet; 51. Reaction air inlet; 52. Reaction air outlet; 61. Cooling air inlet; 62. Cooling air outlet; 71. First groove; 72. First ridge; 81. Second groove; 82. Second ridge; 91. First metal pad; 92. Second metal pad; 101. First pin; 102. Second pin; 111. Upper end plate; 121. Lower end plate; 131. Bipolar plate; 141. Proton exchange membrane; 151. Metal strip; 161. Protrusion; 171. First carbon paper; 172. Second carbon paper; 181. Third carbon paper; 182. Fourth carbon paper. Detailed Implementation

[0012] The present patent can be further understood through the specific embodiments given below, but they are not intended to limit the present patent.

[0013] Example 1: A fuel cell stack includes: an upper end plate 111, a lower end plate 121, and a plurality of bipolar plates 131 and proton exchange membranes 4 stacked alternately between the upper end plate 111 and the lower end plate 121. At least two spaced metal strips 151 are fastened to the periphery of the upper end plate 111, the lower end plate 121, and the plurality of bipolar plates 131 and proton exchange membranes 141. The bipolar plate 131 includes an anode plate 1, a cathode plate 2, and an air cooling plate 3 located between the anode plate 1 and the cathode plate 2. Each of the anode plate 1 and the cathode plate 2 has a hydrogen inlet 41 and a reaction air inlet 51 at one end, and a hydrogen outlet 42 and a reaction air outlet 52 at the other end. The air cooling plate 3 has a cooling air inlet 61 on one side and a cooling air outlet 62 on the other side. The surface of the anode plate 1 opposite to the air cooling plate 3 is provided with a plurality of first grooves 71, and adjacent first grooves 71 are separated by first ridges 72. The surface of the cathode plate 2 opposite to the air cooling plate 3 is provided with a plurality of second grooves 81, and adjacent second grooves 81 are separated by second ridges 82. A first metal pad 91 and a second metal pad 92 are respectively disposed at both ends of the air cooling plate 3 along the length direction. The first metal pad 91 and the second metal pad 92 are located between the air cooling plate 3 and the anode plate 1 or the cathode plate 2, and the first metal pad 91 and the second metal pad 92 have a first pin 101 and a second pin 102, respectively. The first metal pad 91 is connected to the anode plate 1 and the cathode plate 2 through a first carbon paper 171 and a second carbon paper 172, respectively. The second metal pad 92 is connected to the anode plate 1 and the cathode plate 2 through a third carbon paper 181 and a fourth carbon paper 182, respectively.

[0014] The metal strip 151 has a protrusion 161 in the area facing the upper end plate 111 or the lower end plate 121, and this protrusion 161 contacts the upper end plate 111 or the lower end plate 121. This can compensate for thermal expansion and contraction caused by changes in the temperature of the fuel cell stack, maintain a constant pressure on the upper end plate, the lower end plate, the bipolar plate, and the membrane electrode, and keep the contact resistance stable, thereby maintaining stable power generation efficiency.

[0015] The first metal pad 91 and the second metal pad 92 are located between the air cooling plate 3 and the anode plate 1.

[0016] The first pin 101 is located in the region of the first metal pad 91 near the reaction air inlet 51, and the second pin 102 is located in the region of the second metal pad 92 near the reaction air outlet 52.

[0017] Example 2: A fuel cell stack includes: an upper end plate 111, a lower end plate 121, and a plurality of bipolar plates 131 and proton exchange membranes 4 stacked alternately between the upper end plate 111 and the lower end plate 121. At least two spaced metal strips 151 are fastened to the periphery of the upper end plate 111, the lower end plate 121, and the plurality of bipolar plates 131 and proton exchange membranes 141. The bipolar plate 131 includes an anode plate 1, a cathode plate 2, and an air cooling plate 3 located between the anode plate 1 and the cathode plate 2. Each of the anode plate 1 and the cathode plate 2 has a hydrogen inlet 41 and a reaction air inlet 51 at one end, and a hydrogen outlet 42 and a reaction air outlet 52 at the other end. The air cooling plate 3 has a cooling air inlet 61 on one side and a cooling air outlet 62 on the other side. The surface of the anode plate 1 opposite to the air cooling plate 3 is provided with a plurality of first grooves 71, and adjacent first grooves 71 are separated by first ridges 72. The surface of the cathode plate 2 opposite to the air cooling plate 3 is provided with a plurality of second grooves 81, and adjacent second grooves 81 are separated by second ridges 82. A first metal pad 91 and a second metal pad 92 are respectively disposed at both ends of the air cooling plate 3 along the length direction. The first metal pad 91 and the second metal pad 92 are located between the air cooling plate 3 and the anode plate 1 or the cathode plate 2, and the first metal pad 91 and the second metal pad 92 have a first pin 101 and a second pin 102, respectively. The first metal pad 91 is connected to the anode plate 1 and the cathode plate 2 through a first carbon paper 171 and a second carbon paper 172, respectively. The second metal pad 92 is connected to the anode plate 1 and the cathode plate 2 through a third carbon paper 181 and a fourth carbon paper 182, respectively.

[0018] The metal strip 151 has a protrusion 161 in the area facing the upper end plate 111 or the lower end plate 121, and this protrusion 161 contacts the upper end plate 111 or the lower end plate 121. This can compensate for thermal expansion and contraction caused by changes in the temperature of the fuel cell stack, maintain a constant pressure on the upper end plate, the lower end plate, the bipolar plate, and the membrane electrode, and keep the contact resistance stable, thereby maintaining stable power generation efficiency.

[0019] The first metal pad 91 and the second metal pad 92 are located between the air cooling plate 3 and the anode plate 1.

[0020] The first pin 101 and the second pin 102 are arranged diagonally.

[0021] When using the above-mentioned fuel cell stack, the first metal pad and the second metal pad are respectively disposed at both ends of the air cooling plate along the length direction. The first metal pad and the second metal pad are located between the air cooling plate and the anode plate or the cathode plate, and the first metal pad and the second metal pad are respectively provided with a first pin and a second pin. The battery performance can be detected through the first pin and the second pin, so as to understand the performance of the fuel cell in a timely manner, thereby facilitating monitoring and maintenance. In addition, the first metal pad is connected to the anode plate and the cathode plate respectively through a first carbon paper and a second carbon paper, and the second metal pad is connected to the anode plate and the cathode plate respectively through a third carbon paper and a fourth carbon paper, which reduces the contact resistance between the anode plate, the air cooling plate and the cathode plate and improves the power generation efficiency.

[0022] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A fuel cell stack, comprising: The upper end plate (111), the lower end plate (121), and a plurality of bipolar plates (131) and proton exchange membranes (4) stacked alternately between the upper end plate (111) and the lower end plate (121) are characterized in that: at least two spaced metal strips (151) are fastened to the periphery of the upper end plate (111), the lower end plate (121), and the plurality of bipolar plates (131) and proton exchange membranes (141), wherein the bipolar plate (131) includes an anode plate (1), a cathode plate (2), and an air cooling plate (3) located between the anode plate (1) and the cathode plate (2), wherein each of the anode plate (1) and the cathode plate (2) has a hydrogen inlet (41) and a reaction air inlet (51) at one end, and a hydrogen outlet (42) and a reaction air outlet (52) at the other end, wherein the air cooling plate (3) has a cooling air inlet (61) on one side and a cooling air outlet (62) on the other side; The anode plate (1) has a plurality of first grooves (71) on the surface opposite to the air cooling plate (3), and adjacent first grooves (71) are separated by first ridges (72). The cathode plate (2) has a plurality of second grooves (81) on the surface opposite to the air cooling plate (3), and adjacent second grooves (81) are separated by second ridges (82). A first metal pad (91) and a second metal pad (92) are respectively disposed at both ends of the air cooling plate (3) along the length direction. The first metal pad (91) and the second metal pad (92) are located between the air cooling plate (3) and the anode plate (1) or the cathode plate (2). The first metal pad (91) and the second metal pad (92) have a first pin (101) and a second pin (102) respectively. The first metal pad (91) is connected to the anode plate (1) and the cathode plate (2) respectively through a first carbon paper (171) and a second carbon paper (172). The second metal pad (92) is connected to the anode plate (1) and the cathode plate (2) respectively through a third carbon paper (181) and a fourth carbon paper (182).

2. The fuel cell stack according to claim 1, characterized in that: The metal strip (151) has a protrusion (161) in the area facing the upper end plate (111) or the lower end plate (121), and this protrusion (161) contacts the upper end plate (111) or the lower end plate (121).

3. The fuel cell stack according to claim 1 or 2, characterized in that: The first metal pad (91) and the second metal pad (92) are located between the air cooling plate (3) and the anode plate (1).

4. The fuel cell stack according to claim 1 or 2, characterized in that: The first pin (101) is located in the region of the first metal pad (91) near the reaction air inlet (51), and the second pin (102) is located in the region of the second metal pad (92) near the reaction air outlet (52).

5. The fuel cell stack according to claim 1 or 2, characterized in that: The first pin (101) and the second pin (102) are arranged diagonally.

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