Cathode plate assembly, fuel cell and fuel cell stack

Abstract

The present invention proposes a cathode plate assembly, a fuel cell and a fuel cell stack, wherein the cathode plate assembly comprises: a cathode plate, a first sealing ring, a second sealing ring, a first connecting channel and a second connecting channel, the cathode plate comprises a second side surface, the second side surface is provided with a plurality of cooling channels, a first flow-blocking channel and a second flow-blocking channel, the first flow-blocking channel is located between two adjacent cooling channels, the second flow-blocking channel is located between two adjacent cooling channels, a first fuel gas inlet and a first fuel gas outlet are provided on the cathode plate, the first sealing ring and the second sealing ring are both provided on the cathode plate, the first sealing ring surrounds the first fuel gas inlet and blocks the first flow-blocking channel, the second sealing ring surrounds the first fuel gas outlet and blocks the second flow-blocking channel, the first connecting channel connects the first flow-blocking channel and the cooling channel, and the second connecting channel connects the second flow-blocking channel and the cooling channel. The cathode plate assembly of the present invention can avoid excessively high temperatures near the fuel gas inlet and outlet.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a cathode plate assembly, a fuel cell and a fuel cell stack. Background Art

[0002] In the related art, the air-cooled fuel cell sets the hydrogen inlet and outlet in the anode reaction area (cathode reaction area) of the anode plate (cathode plate). Since it does not need to open up a manifold area separately, and when the volume of the fuel cell is the same, the active area (reaction area) accounts for a larger proportion than other fuel cells. However, when the air-cooled fuel cell in the related art seals the hydrogen inlet and outlet, the sealing gasket will block part of the flow channel on the cathode plate, resulting in a non-flowing area of ​​the flow channel, which in turn makes the temperature near the hydrogen inlet and outlet higher. Summary of the invention

[0003] The present invention is based on the inventor's discovery and understanding of the following facts and problems:

[0004] The inventors found that in the related art, the temperature near the hydrogen inlet and outlet is relatively high and easily exceeds the temperature tolerance range of the sealing gasket, thereby accelerating the aging of the sealing gasket. In severe cases, hydrogen leakage will occur, seriously affecting the performance and safety of the fuel cell.

[0005] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0006] To this end, an embodiment of the present invention provides a cathode plate assembly, which can prevent the temperature near the fuel gas inlet and outlet from being too high.

[0007] An embodiment of the present invention provides a fuel cell having the advantages of good performance and high safety.

[0008] An embodiment of the present invention provides a fuel cell stack having the advantages of good performance and high safety.

[0009] A cathode plate assembly according to an embodiment of the present invention comprises: a cathode plate, the cathode plate comprising a first side surface and a second side surface opposite to each other in a thickness direction of the cathode plate, one of the first side surface and the second side surface being provided with a plurality of cooling channels arranged at intervals, at least one first flow-blocking channel and at least one second flow-blocking channel, the at least one first flow-blocking channel being located between two adjacent cooling channels, the at least one second flow-blocking channel being located between two adjacent cooling channels, a first fuel gas inlet and a first fuel gas outlet being provided on the cathode plate, the first fuel gas inlet and the first fuel gas outlet being arranged at intervals, the first fuel gas inlet passing through the first flow-blocking channel, and the first fuel gas outlet passing through the second flow-blocking channel; a first sealing ring and a second sealing ring, both of which are provided on the cathode plate, the first sealing ring surrounding the first fuel gas inlet and blocking the first flow-blocking channel, the second sealing ring surrounding the first fuel gas outlet and blocking the second flow-blocking channel; and a first connecting channel and a second connecting channel, the first connecting channel connecting the first flow-blocking channel and the cooling channel adjacent thereto, the second connecting channel connecting the second flow-blocking channel and the cooling channel adjacent thereto.

[0010] When the cathode plate assembly of the embodiment of the present invention is in use, when the coolant is introduced into the first shut-off channel and the second shut-off channel, since the first connecting channel connects the first shut-off channel and the cooling channel adjacent to it, and the second connecting channel connects the second shut-off channel and the cooling channel adjacent to it, blockage of the coolant near the first sealing ring and the second sealing ring is avoided, thereby achieving a cooling function, thereby avoiding excessive temperature near the first sealing ring and the second sealing ring.

[0011] Therefore, the cathode plate assembly according to the embodiment of the present invention can prevent the temperature near the fuel gas inlet and outlet from being too high.

[0012] In some embodiments, the first flow-cutting channel includes a first part and a second part arranged at intervals in its extension direction, the first sealing ring is located between the first part and the second part, and the second flow-cutting channel includes a third part and a fourth part arranged at intervals in its extension direction, and the second sealing ring is located between the third part and the fourth part.

[0013] In some embodiments, there are a plurality of first communication channels and the first communication channels are arranged at intervals along the width direction of the cathode plate, a portion of the plurality of first communication channels is located on one side of the first sealing ring in the width direction of the cathode plate, and another portion of the plurality of first communication channels is located on the other side of the first sealing ring in the width direction of the cathode plate;

[0014] There are multiple second connecting channels and they are arranged at intervals along the width direction of the cathode plate. A part of the multiple second connecting channels is located on one side of the second sealing ring in the width direction of the cathode plate, and another part of the multiple second connecting channels is located on the other side of the second sealing ring in the width direction of the cathode plate.

[0015] In some embodiments, the other of the first side and the second side is provided with a plurality of oxidation channels arranged at intervals, at least one third flow-blocking channel and at least one fourth flow-blocking channel, wherein the at least one third flow-blocking channel is located between two adjacent oxidation channels, and the at least one fourth flow-blocking channel is located between two adjacent oxidation channels.

[0016] The first sealing ring blocks the third flow-breaking channel, the second sealing ring blocks the fourth flow-breaking channel, the third flow-breaking channel includes a fifth portion and a sixth portion arranged at intervals in its extension direction, the first sealing ring is located between the fifth portion and the sixth portion, the fourth flow-breaking channel includes a seventh portion and an eighth portion arranged at intervals in its extension direction, and the second sealing ring is located between the seventh portion and the eighth portion.

[0017] In some embodiments, the cathode plate assembly includes a third connecting channel and a fourth connecting channel, the third connecting channel connecting the third shut-off channel and the oxidation channel adjacent thereto, and the fourth connecting channel connecting the fourth shut-off channel and the oxidation channel adjacent thereto.

[0018] In some embodiments, there are a plurality of the third communication channels and they are arranged at intervals along the width direction of the cathode plate, a portion of the plurality of the third communication channels is located on one side of the first sealing ring in the width direction of the cathode plate, and another portion of the plurality of the third communication channels is located on the other side of the first sealing ring in the width direction of the cathode plate;

[0019] There are multiple fourth connecting channels and they are arranged at intervals along the width direction of the cathode plate. A part of the multiple fourth connecting channels is located on one side of the second sealing ring in the width direction of the cathode plate, and another part of the multiple fourth connecting channels is located on the other side of the second sealing ring in the width direction of the cathode plate.

[0020] In some embodiments, the plurality of first communication channels correspond to the plurality of third communication channels in a one-to-one manner in the thickness direction of the cathode plate;

[0021] The plurality of second communication channels correspond to the plurality of fourth communication channels in a one-to-one manner in the thickness direction of the cathode plate.

[0022] In some embodiments, one of the first side surface and the second side surface is provided with a plurality of protrusions arranged at intervals along the length direction of the cathode plate, and the other of the first side surface and the second side surface is provided with a plurality of grooves arranged at intervals along the length direction of the cathode plate, the plurality of protrusions and the plurality of grooves correspond one-to-one in the thickness direction of the cathode plate, and the length dimensions of the protrusions and the grooves are consistent with the width dimension of the cathode plate, the oxidation channel and the third shut-off channel and the fourth shut-off channel are formed between two adjacent protrusions, and the cooling channel and the first shut-off channel and the second shut-off channel form the groove.

[0023] A fuel cell according to an embodiment of the present invention comprises a cathode plate assembly, a membrane electrode assembly and an anode plate according to any one of the above embodiments, wherein a second fuel gas inlet and a second fuel gas outlet are provided on the anode plate and penetrate the anode plate in the thickness direction of the anode plate, and the second fuel gas inlet and the second fuel gas outlet are arranged at intervals;

[0024] The membrane electrode assembly is sandwiched between the anode plate and the cathode plate, and the membrane electrode assembly is provided with a third fuel gas inlet and a third fuel gas outlet which penetrate the membrane electrode assembly along the thickness direction of the anode plate. The third fuel gas inlet is opposite to and connected with each of the first fuel gas inlet and the second fuel gas inlet in the thickness direction of the anode plate, and the third fuel gas outlet is opposite to and connected with each of the first fuel gas outlet and the second fuel gas outlet in the thickness direction of the anode plate.

[0025] The fuel cell stack of an embodiment of the present invention includes: a plurality of fuel cells according to the above-mentioned embodiments, wherein the plurality of fuel cells are stacked on each other along the thickness direction of the anode plate, and among adjacent fuel cells, the cathode plate of one fuel cell is arranged adjacent to the anode plate of another fuel cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the structure of the cathode plate assembly according to an embodiment of the present invention.

[0027] Figure 2 It is a schematic structural diagram of the first fuel gas inlet or the first fuel gas outlet of the cathode plate of Example 1 of the present invention.

[0028] Figure 3 It is a schematic structural diagram of the first fuel gas inlet or the first fuel gas outlet on the first side of the cathode plate of embodiment 2 of the invention.

[0029] Figure 4 It is a schematic structural diagram of the first fuel gas inlet or the first fuel gas outlet on the second side of the cathode plate of embodiment 2 of the invention.

[0030] Figure 5 3 is a velocity streamline diagram in the cathode plate of Example 1 of the present invention. Figure 6 It is a temperature field distribution diagram in the cathode plate in the related art.

[0031] Figure 7 It is the temperature field distribution diagram of the cathode plate of Example 1 of the present invention.

[0032] Figure 8 It is a schematic diagram of the structure of a fuel cell according to an embodiment of the present invention.

[0033] Reference numerals:

[0034] Cathode plate 1; first communication channel 12; second communication channel 13; third communication channel 14; fourth communication channel 15; first sealing groove 16; second sealing groove 17; first fuel gas inlet 18; first fuel gas outlet 19;

[0035] First side 10; oxidation channel 101; third cut-off channel 102; fifth portion 1021; sixth portion 1022; fourth cut-off channel 103; seventh portion 1031; eighth portion 1032;

[0036] The second side surface 11; the cooling channel 111; the first interrupting channel 112; the first portion 1121; the second portion 1122; the second interrupting channel 113; the third portion 1131; the fourth portion 1132;

[0037] A first sealing ring 21; a second sealing ring 22;

[0038] Anode plate 3; second fuel gas inlet 31; second fuel gas outlet 32;

[0039] Membrane electrode assembly 4; third fuel gas inlet 41; third fuel gas outlet 42. DETAILED DESCRIPTION

[0040] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0041] like Figure 1-Figure 2 As shown, the cathode plate assembly of Embodiment 1 of the present invention comprises: a cathode plate 1 , a first sealing ring 21 , a second sealing ring 22 , a first connecting channel 12 and a second connecting channel 13 .

[0042] The cathode plate 1 includes a Figure 1A first side surface 10 and a second side surface 11 are opposite to each other in the front-to-back direction (in the front-to-back direction), and one of the first side surface 10 and the second side surface 11 is provided with a plurality of cooling channels 111 arranged at intervals, at least one first flow-blocking channel 112 and at least one second flow-blocking channel 113. At least one first flow-blocking channel 112 is located between two adjacent cooling channels 111, and at least one second flow-blocking channel 113 is located between two adjacent cooling channels 111. A first fuel gas inlet 18 and a first fuel gas outlet 19 that penetrate the cathode plate 1 are provided on the cathode plate 1, and the first fuel gas inlet 18 and the first fuel gas outlet 19 are arranged at intervals, and the first fuel gas inlet 18 passes through the first flow-blocking channel 112, and the first fuel gas outlet 19 passes through the second flow-blocking channel 113.

[0043] Specifically, Figure 1 and Figure 2 As shown, the front side of the cathode plate 1 is the first side 10, the rear side of the cathode plate 1 is the second side 11, the cooling channel 111, the first interrupting channel 112 and the second interrupting channel 113 are all arranged on the second side 11, and the extension direction of the cooling channel 111, the first interrupting channel 112 and the second interrupting channel 113 is parallel to the width direction of the cathode plate 1 (such as Figure 1 The first fuel outlet and the first fuel inlet are arranged at intervals in the vertical direction. The cathode plate 1 is also provided with a first sealing groove 16 and a second sealing groove 17, the first sealing groove 16 surrounds the first fuel gas inlet 18, and the second sealing groove 17 surrounds the first fuel gas outlet 19.

[0044] It can be understood that there can be multiple cooling channels 111, multiple first interrupting channels 112 and multiple second interrupting channels 113, and multiple cooling channels 111, multiple first interrupting channels 112 and multiple second interrupting channels 113 are all along the length direction of the cathode plate 1 (such as Figure 1 The right ends of the cooling channel 111, the first shut-off channel 112 and the second shut-off channel 113 are used to pass cooling gas to cool the air-cooled fuel cell.

[0045] The first sealing ring 21 and the second sealing ring 22 are both arranged on the cathode plate 1, that is, the first sealing ring 21 is fitted in the first sealing groove 16, and the second sealing ring 22 is fitted in the second sealing groove 17. The first sealing ring 21 surrounds the first fuel gas inlet 18 and blocks the first shut-off channel 112, and the second sealing ring 22 surrounds the first fuel gas outlet 19 and blocks the second shut-off channel 113. The first connecting channel 12 connects the first shut-off channel 112 and the cooling channel 111 adjacent thereto, and the second connecting channel 13 connects the second shut-off channel 113 and the cooling channel 111 adjacent thereto.

[0046] It can be understood that the outer peripheral surface of the first sealing ring 21 abuts against part of the first shut-off channel 112, which will prevent the gas entering the first shut-off channel 112 from flowing. However, the cathode plate 1 is provided with a first connecting channel 12, and the first shut-off channel 112 and the adjacent cooling channel 111 are connected through the first connecting channel 12, so that the gas entering the first shut-off channel 112 can flow out from the cooling channel 111 connected thereto, thereby realizing the flow of gas in the first shut-off channel 112, thereby reducing the temperature near the first fuel gas inlet 18. Similarly, the second connecting channel 13 connects the second shut-off channel 113 and the adjacent cooling channel 111, thereby realizing the flow of gas in the second shut-off channel 113, thereby reducing the temperature near the second fuel gas outlet 32.

[0047] That is to say, when the cathode plate assembly of Example 1 of the present invention is in use, when cooling gas is introduced into the first shut-off channel 112 and the second shut-off channel 113, since the first connecting channel 12 connects the first shut-off channel 112 and the cooling channel 111 adjacent thereto, and the second connecting channel 13 connects the second shut-off channel 113 and the cooling channel 111 adjacent thereto, blockage of the cooling gas near the first sealing ring 21 and the second sealing ring 22 is avoided, thereby achieving a cooling function, thereby avoiding excessive temperatures near the first sealing ring 21 and the second sealing ring 22.

[0048] Therefore, the cathode plate assembly of Example 1 of the present invention can avoid excessively high temperatures near the fuel gas inlet and outlet.

[0049] In Example 1, Figure 2 As shown, the first flow-blocking channel 112 includes a Figure 1 The first portion 1121 and the second portion 1122 are spaced apart in the left-right direction (in the left-right direction), the first sealing ring 21 is located between the first portion 1121 and the second portion 1122, the second flow-breaking channel 113 includes a third portion 1131 and a fourth portion 1132 spaced apart in the extension direction thereof, and the second sealing ring 22 is located between the third portion 1131 and the fourth portion 1132.

[0050] Specifically, Figure 2As shown, the first fuel gas inlet 18 passes through the first shut-off channel 112, dividing the first shut-off channel 112 into two left and right parts (i.e., a first part 1121 and a second part 1122), the first part 1121 is located on the right side of the second part 1122, and the left end of the first part 1121 and the right end of the second part 1122 both abut against the outer peripheral surface of the first sealing ring 21. The first fuel gas outlet 19 passes through the second shut-off channel 113, dividing the second shut-off channel 113 into two left and right parts (i.e., a third part 1131 and a fourth part 1132), the third part 1131 is located on the right side of the fourth part 1132, and the left end of the third part 1131 and the right end of the fourth part 1132 both abut against the outer peripheral surface of the second sealing ring 22.

[0051] It is understandable that if Figure 2 As shown, the first part 1121 and the second part 1122 are both connected to the adjacent cooling channel 111 through the first connecting channel 12, that is, when cooling gas is introduced into the first cut-off channel 112, the cooling gas can flow to the cooling channel 111 through the first part 1121 and the first connecting channel 12, and the cooling gas in the cooling channel 111 can also flow to the second part 1122 through the first connecting channel 12, so that the gas in the first part 1121 and the second part 1122 flows and is discharged through heat exchange, so as to reduce the temperature near the first fuel gas inlet 18. Similarly, the gas in the third part 1131 and the fourth part 1132 can also flow and be discharged through heat exchange, so as to reduce the temperature near the first fuel gas outlet 19.

[0052] In Example 1, Figure 2 As shown, there are multiple first connecting channels 12 and they are arranged at intervals along the width direction of the cathode plate 1. A portion of the multiple first connecting channels 12 is arranged along the width direction of the cathode plate 1 (eg Figure 1 The plurality of first connecting channels 12 are located on one side of the first sealing ring 21 in the left-right direction in the cathode plate 1, and another part of the plurality of first connecting channels 12 is located on the other side of the first sealing ring 21 in the width direction of the cathode plate 1; there are multiple second connecting channels 13 and they are arranged at intervals along the width direction of the cathode plate 1, a part of the plurality of second connecting channels 13 is located on one side of the second sealing ring 22 in the width direction of the cathode plate 1, and another part of the plurality of second connecting channels 13 is located on the other side of the second sealing ring 22 in the width direction of the cathode plate 1.

[0053] Specifically, Figure 2As shown, a part of the multiple first connecting channels 12 connects the first part 1121 with the cooling channel 111, and another part of the multiple first connecting channels 12 connects the second part 1122 with the cooling channel 111, that is, when the cooling gas is introduced into the first cut-off channel 112, the cooling gas can flow from a part of the multiple first connecting channels 12 to the cooling channel 111, and then flow to the second part 1122 through another part of the multiple first connecting channels 12, so that the flow of gas in the first cut-off channel 112 can be achieved, and the cooling effect near the first fuel gas inlet 18 can be further improved. Similarly, the third part 1131 and the fourth part 1132 are respectively connected to the adjacent cooling channel 111 through the multiple second connecting channels 13, so that the flow of gas in the second cut-off channel 113 can be achieved, and the cooling effect near the first fuel gas outlet 19 can be further improved.

[0054] It should be noted that the distance between the first fuel gas inlet 18 and the adjacent first communication channel 12 is greater than or equal to 4 mm and less than or equal to 10 mm, and the distance between the first fuel gas outlet 19 and the adjacent second communication channel 13 is greater than or equal to 4 mm and less than or equal to 10 mm. Of course, the position between the first communication channel 12 and the first fuel gas inlet 18 and the position between the second communication channel 13 and the first fuel gas outlet 19 can be adjusted according to the different design conditions such as the structure and size of the cathode plate 1. The number and size of the first communication channel 12 and the second communication channel 13 can also be adjusted according to the different design conditions such as the structure and size of the cathode plate 1, so as to achieve a better cooling effect.

[0055] In addition, if Figure 2 As shown, the cross-sections of the first communication channel 12 and the second communication channel 13 are substantially rectangular. Optionally, the cross-sections of the first communication channel 12 and the second communication channel 13 may also be hyperbolic, triangular, or other shapes.

[0056] In Example 2, Figure 3 and Figure 4 As shown. A plurality of oxidation channels 101, at least one third flow-blocking channel 102 and at least one fourth flow-blocking channel 103 are arranged at intervals on the first side 10, at least one third flow-blocking channel 102 is located between two adjacent oxidation channels 101, at least one fourth flow-blocking channel 103 is located between two adjacent oxidation channels 101, the first sealing ring 21 blocks the third flow-blocking channel 102, and the second sealing ring 22 blocks the fourth flow-blocking channel 103. Compared with Example 1, the preferred cathode plate assembly further includes a third connecting channel 14 and a fourth connecting channel 15, the third connecting channel 14 connects the third flow-blocking channel 102 and the oxidation channel 101 adjacent thereto, and the fourth connecting channel 15 connects the fourth flow-blocking channel 103 and the oxidation channel 101 adjacent thereto.

[0057] Specifically, Figure 3 As shown, the oxidation channel 101 , the third interruption channel 102 and the fourth interruption channel 103 are all arranged on the first side surface 10 , and the extension direction of the oxidation channel 101 , the third interruption channel 102 and the fourth interruption channel 103 is consistent with the width direction of the cathode plate 1 .

[0058] It can be understood that there can be multiple oxidation channels 101, multiple third cut-off channels 102 and multiple fourth cut-off channels 103, and multiple oxidation channels 101, multiple third cut-off channels 102 and multiple fourth cut-off channels 103 are arranged at intervals along the length direction of the cathode plate 1, and the right ends of the oxidation channels 101, the third cut-off channels 102 and the fourth cut-off channels 103 are used to introduce oxidant gas for oxidation reaction.

[0059] In Example 2, the third shut-off channel 102 includes a fifth portion 1021 and a sixth portion 1022 arranged at intervals in its extension direction, and the first sealing ring 21 is located between the fifth portion 1021 and the sixth portion 1022. The fourth shut-off channel 103 includes a seventh portion 1031 and an eighth portion 1032 arranged at intervals in its extension direction, and the second sealing ring 22 is located between the seventh portion 1031 and the eighth portion 1032.

[0060] Specifically, Figure 3 As shown, the first fuel gas inlet 18 passes through the third shut-off channel 102, dividing the third shut-off channel 102 into two left and right parts (i.e., the fifth part 1021 and the sixth part 1022), the fifth part 1021 is located on the right side of the sixth part 1022, and the left end of the fifth part 1021 and the right end of the sixth part both abut against the outer peripheral surface of the first sealing ring 21. The first fuel gas outlet 19 passes through the fourth shut-off channel 103, dividing the fourth shut-off channel 103 into two left and right parts (i.e., the seventh part 1031 and the eighth part 1032), the seventh part 1031 is located on the right side of the eighth part 1032, and the left end of the seventh part 1031 and the right end of the eighth part 1032 both abut against the outer peripheral surface of the second sealing ring 22.

[0061] It is understandable that if Figure 3As shown, the fifth part 1021 and the sixth part 1022 are both connected to the oxidation channel 101 adjacent thereto through the third connecting channel 14, that is, when the oxidant gas is introduced into the third cut-off channel 102, the oxidant gas can flow to the oxidation channel 101 through the fifth part 1021 and the third connecting channel 14, and the oxidant gas in the oxidation channel 101 can also flow to the sixth part 1022 through the third connecting channel 14, so that the gas in the fifth part 1021 and the sixth part 1022 flows and is discharged by heat exchange, the stagnation zone is reduced, the oxidation reaction is promoted, and the temperature near the first fuel gas inlet 18 is further reduced. Similarly, the gas in the seventh part 1031 and the eighth part 1032 can also flow and be discharged by heat exchange, so as to increase the reaction area and further reduce the temperature near the first fuel gas outlet 19.

[0062] In Example 2, there are multiple third connecting channels 14 and they are arranged at intervals along the width direction of the cathode plate 1, a part of the multiple third connecting channels 14 is located on one side of the first sealing ring 21 in the width direction of the cathode plate 1, and another part of the multiple third connecting channels 14 is located on the other side of the first sealing ring 21 in the width direction of the cathode plate 1; there are multiple fourth connecting channels 15 and they are arranged at intervals along the width direction of the cathode plate 1, a part of the multiple fourth connecting channels 15 is located on one side of the second sealing ring 22 in the width direction of the cathode plate 1, and another part of the multiple fourth connecting channels 15 is located on the other side of the second sealing ring 22 in the width direction of the cathode plate 1.

[0063] Specifically, Figure 3 As shown, a part of the plurality of third connecting channels 14 connects the fifth part 1021 with the oxidation channel 101, and another part of the plurality of third connecting channels 14 connects the sixth part 1022 with the oxidation channel 101. That is, as shown in FIG. Figure 3 As shown, when the oxidant gas is introduced into the third cut-off channel 102, the oxidant gas can flow from the multiple third connecting channels 14 to the oxidation channel 101, and then flow to the sixth part 1022 through the multiple third connecting channels 14, so that the flow of the oxidant gas in the third cut-off channel 102 can be achieved, the reaction area is increased, the oxidation reaction is promoted, and the cooling effect near the first fuel gas inlet 18 is further improved. Similarly, the seventh part 1031 and the eighth part 1032 are respectively connected to the oxidation channel 101 adjacent thereto through multiple fourth connecting channels 15, so that the flow of the oxidant gas in the fourth cut-off channel 103 can be achieved, the reaction area is increased, the oxidation reaction is promoted, and the cooling effect near the first fuel gas outlet 19 is further improved.

[0064] It should be noted that the distance between the first fuel gas inlet 18 and the adjacent third connecting channel 14 is greater than or equal to 4 mm and less than or equal to 10 mm, and the distance between the first fuel gas outlet 19 and the adjacent fourth connecting channel 15 is greater than or equal to 4 mm and less than or equal to 10 mm. Of course, the position between the third connecting channel 14 and the first fuel gas inlet 18 and the position between the fourth connecting channel 15 and the first fuel gas outlet 19 can be adjusted according to the different design conditions such as the structure and size of the cathode plate 1. The number and size of the third connecting channel 14 and the fourth connecting channel 15 can also be adjusted according to the different design conditions such as the structure and size of the cathode plate 1, so as to improve the reaction effect of the oxidation reaction and achieve a better cooling effect.

[0065] In addition, if Figure 3 As shown, the cross-sections of the third communication channel 14 and the fourth communication channel 15 are substantially rectangular. Optionally, the cross-sections of the third communication channel 14 and the fourth communication channel 15 may also be hyperbolic, triangular, or other shapes.

[0066] In Embodiment 2, the first communication channels 12 correspond to the third communication channels 14 in one-to-one correspondence in the thickness direction of the cathode plate 1 ; the second communication channels 13 correspond to the fourth communication channels 15 in one-to-one correspondence in the thickness direction of the cathode plate 1 .

[0067] Specifically, Figure 3 and Figure 4 As shown, the number of the first communication channels 12 and the third communication channels 14 is equal, and one first communication channel 12 corresponds to one third communication channel 14 in the front-to-back direction of the cathode plate 1, which makes the cathode plate 1 easier to process, optimizes the manufacturing process of the cathode plate 1, and improves the manufacturing efficiency of the cathode plate 1. Similarly, the plurality of second communication channels 13 and the plurality of fourth communication channels 15 correspond one-to-one in the thickness direction of the cathode plate 1, which can also facilitate the manufacturing of the cathode plate 1.

[0068] In Example 1 and Example 2, one of the first side surface 10 and the second side surface 11 is provided with a plurality of protrusions arranged at intervals along the length direction of the cathode plate 1, and the other of the first side surface 10 and the second side surface 11 is provided with a plurality of grooves arranged at intervals along the length direction of the cathode plate 1, the plurality of protrusions and the plurality of grooves correspond one to one in the thickness direction of the cathode plate 1, and the length dimensions of the protrusions and the grooves are consistent with the width dimension of the cathode plate 1, the oxidation channel 101 and the third interrupting channel 102 and the fourth interrupting channel 103 are formed between two adjacent protrusions, and the cooling channel 111 and the first interrupting channel 112 and the second interrupting channel 113 form a groove.

[0069] Specifically, Figure 3 and Figure 4As shown, the protrusion is provided on the first side surface 10. The protrusion includes a first side wall surface and a second side wall surface, the first side wall surface and the second side wall surface are arranged oppositely in the up-down direction, the first side wall surface is located above the second side wall surface, the first side wall surface of a protrusion, the second side wall surface of another protrusion adjacent thereto and the cathode plate 1 form a recessed channel, there are multiple recessed channels, and the multiple recessed channels form one of the oxidation channel 101 and the third interruption channel 102 and the fourth interruption channel 103. The groove is provided on the second side surface 11, the groove includes a third side wall surface and a fourth side wall surface, the third side wall surface and the fourth side wall surface are arranged oppositely in the up-down direction, the third side wall surface is located above the fourth side wall surface, the third side wall surface of a groove, the fourth side wall surface of another groove adjacent thereto and the cathode plate 1 form a protruding portion, there are multiple protruding portions, and a groove is defined between two adjacent protruding portions.

[0070] It should be noted that if Figure 6 and Figure 7 As shown, when the cathode plate 1 is provided with the first connecting channel 12 and the second connecting channel 13, the temperature near the fuel gas inlet and outlet is significantly lower than that near the fuel gas inlet and outlet in the related art, which effectively avoids the problem of the sealing ring being intolerant to high temperatures.

[0071] Next, a fuel cell according to an embodiment of the present invention will be described.

[0072] like Figure 8 As shown, the fuel cell of an embodiment of the present invention includes a cathode plate assembly, a membrane electrode assembly 4 and an anode plate 3 according to some or any of the above embodiments, the anode plate 3 is provided with a second fuel gas inlet 31 and a second fuel gas outlet 32 ​​which penetrate the anode plate 3 along the thickness direction of the anode plate 3, and the second fuel gas inlet 31 and the second fuel gas outlet 32 ​​are arranged at intervals; the membrane electrode assembly 4 is sandwiched between the anode plate 3 and the cathode plate 1, and the membrane electrode assembly 4 is provided with a third fuel gas inlet 41 and a third fuel gas outlet 42 which penetrate the membrane electrode assembly 4 along the thickness direction of the anode plate 3, the third fuel gas inlet 41 is opposite to and connected with each of the first fuel gas inlet 18 and the second fuel gas inlet 31 in the thickness direction of the anode plate 3, and the third fuel gas outlet 42 is opposite to and connected with each of the first fuel gas outlet 19 and the second fuel gas outlet 32 ​​in the thickness direction of the anode plate 3.

[0073] Specifically, Figure 8 As shown, the thickness direction of the anode plate 3 is consistent with the thickness direction of the cathode plate 1. The anode plate 3, the membrane electrode assembly 4 and the cathode plate assembly are stacked and connected in sequence to form a fuel cell, wherein the first sealing ring 21 and the second sealing ring 22 are both against the membrane electrode assembly 4.

[0074] It is understandable that if Figure 8As shown, the fuel gas can enter the fuel cell through the first fuel gas inlet 18, or through the second fuel gas inlet and the third fuel gas inlet, so as to provide the fuel cell with the fuel required for the reaction. The fuel gas can flow out of the fuel cell through the first fuel gas outlet 19, or through the second fuel gas outlet 32 ​​and the third fuel gas outlet 42.

[0075] It should be noted that the fuel cell of the embodiment of the present invention may be a hydrogen fuel cell, the fuel gas of the hydrogen fuel cell is hydrogen, and the oxidant gas is oxygen. Of course, the oxidant gas may also be air. The air can not only provide the fuel cell with oxygen required for the reaction, but also serve as a cooling gas to provide the fuel cell with cooling gas required for heat dissipation.

[0076] That is to say, during the use of the fuel cell of the embodiment of the present invention, due to the good cooling effect near the first fuel gas inlet 18 and the first fuel gas outlet 19 on the cathode plate 1, the temperature near the first fuel gas inlet 18 and the first fuel gas outlet 19 is kept within a relatively normal range, thereby avoiding the problem of aging of the sealing ring due to excessive temperature. Therefore, the overall performance of the fuel cell can be improved, and the safety of the fuel cell can also be improved.

[0077] The fuel cell stack according to an embodiment of the present invention is described below.

[0078] The fuel cell stack of an embodiment of the present invention includes multiple fuel cells according to the above-mentioned embodiments, and the multiple fuel cells are stacked on each other along the thickness direction of the anode plate 3. In adjacent fuel cells, the cathode plate 1 of one fuel cell is arranged adjacent to the anode plate 3 of another fuel cell.

[0079] That is, the cathode plate 1 of one fuel cell is adjacent to the anode plate 3 of another fuel cell adjacent thereto. In other words, the anode plate 3 of one fuel cell is adjacent to the cathode plate 1 of another fuel cell adjacent thereto. Thus, a plurality of fuel cells are stacked one on top of another in the above order.

[0080] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0081] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0082] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0083] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0084] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0085] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A cathode plate assembly, characterized in that: include: a cathode plate, the cathode plate comprising a first side surface and a second side surface opposite to each other in a thickness direction of the cathode plate, One of the first side and the second side is provided with a plurality of cooling channels arranged at intervals, at least one first interrupting channel and at least one second interrupting channel, wherein the at least one first interrupting channel is located between two adjacent cooling channels, and the at least one second interrupting channel is located between two adjacent cooling channels, A first fuel gas inlet and a first fuel gas outlet are provided on the cathode plate, the first fuel gas inlet and the first fuel gas outlet are arranged at intervals, the first fuel gas inlet passes through the first shut-off channel, and the first fuel gas outlet passes through the second shut-off channel; A first sealing ring and a second sealing ring, wherein the first sealing ring and the second sealing ring are both arranged on the cathode plate, the first sealing ring surrounds the first fuel gas inlet and blocks the first flow-blocking channel, and the second sealing ring surrounds the first fuel gas outlet and blocks the second flow-blocking channel; and a first communicating channel and a second communicating channel, wherein the first communicating channel communicates with the first shut-off channel and the cooling channel adjacent thereto, and the second communicating channel communicates with the second shut-off channel and the cooling channel adjacent thereto; When cooling gas is introduced into the first cut-off channel and the second cut-off channel, since the first connecting channel connects the first cut-off channel and the cooling channel adjacent to it, and the second connecting channel connects the second cut-off channel and the cooling channel adjacent to it, blockage of cooling gas near the first sealing ring and the second sealing ring is avoided.

2. The cathode plate assembly according to claim 1, characterized in that: The first flow-cutting channel includes a first part and a second part arranged at intervals in its extension direction, and the first sealing ring is located between the first part and the second part. The second flow-cutting channel includes a third part and a fourth part arranged at intervals in its extension direction, and the second sealing ring is located between the third part and the fourth part.

3. The cathode plate assembly according to claim 1, characterized in that: There are a plurality of first communication channels, which are arranged at intervals along the width direction of the cathode plate, a portion of the plurality of first communication channels is located on one side of the first sealing ring in the width direction of the cathode plate, and another portion of the plurality of first communication channels is located on the other side of the first sealing ring in the width direction of the cathode plate; There are multiple second connecting channels and they are arranged at intervals along the width direction of the cathode plate. A part of the multiple second connecting channels is located on one side of the second sealing ring in the width direction of the cathode plate, and another part of the multiple second connecting channels is located on the other side of the second sealing ring in the width direction of the cathode plate.

4. The cathode plate assembly according to claim 1, characterized in that: The other of the first side and the second side is provided with a plurality of oxidation channels arranged at intervals, at least one third flow-blocking channel and at least one fourth flow-blocking channel, wherein the at least one third flow-blocking channel is located between two adjacent oxidation channels, and the at least one fourth flow-blocking channel is located between two adjacent oxidation channels. The first sealing ring blocks the third flow-breaking channel, the second sealing ring blocks the fourth flow-breaking channel, the third flow-breaking channel includes a fifth portion and a sixth portion arranged at intervals in its extension direction, the first sealing ring is located between the fifth portion and the sixth portion, the fourth flow-breaking channel includes a seventh portion and an eighth portion arranged at intervals in its extension direction, and the second sealing ring is located between the seventh portion and the eighth portion.

5. The cathode plate assembly according to claim 4, characterized in that: The cathode plate assembly includes a third communication channel and a fourth communication channel, wherein the third communication channel communicates with the third shutoff channel and the oxidation channel adjacent thereto, and the fourth communication channel communicates with the fourth shutoff channel and the oxidation channel adjacent thereto.

6. The cathode plate assembly according to claim 5, characterized in that: There are a plurality of the third communication channels and they are arranged at intervals along the width direction of the cathode plate, a portion of the plurality of the third communication channels is located on one side of the first sealing ring in the width direction of the cathode plate, and another portion of the plurality of the third communication channels is located on the other side of the first sealing ring in the width direction of the cathode plate; There are multiple fourth connecting channels and they are arranged at intervals along the width direction of the cathode plate. A part of the multiple fourth connecting channels is located on one side of the second sealing ring in the width direction of the cathode plate, and another part of the multiple fourth connecting channels is located on the other side of the second sealing ring in the width direction of the cathode plate.

7. The cathode plate assembly according to claim 6, characterized in that: The plurality of first communication channels and the plurality of third communication channels correspond one to one in the thickness direction of the cathode plate; The plurality of second communication channels correspond to the plurality of fourth communication channels in a one-to-one manner in the thickness direction of the cathode plate.

8. The cathode plate assembly according to claim 4, characterized in that: One of the first side surface and the second side surface is provided with a plurality of protrusions arranged at intervals along the length direction of the cathode plate, and the other of the first side surface and the second side surface is provided with a plurality of grooves arranged at intervals along the length direction of the cathode plate, the plurality of protrusions and the plurality of grooves correspond one to one in the thickness direction of the cathode plate, and the length dimensions of the protrusions and the grooves are consistent with the width dimension of the cathode plate, the oxidation channel and the third interruption channel and the fourth interruption channel are formed between two adjacent protrusions, and the cooling channel and the first interruption channel and the second interruption channel form the groove.

9. A fuel cell, characterized in that: The method comprises a cathode plate assembly, a membrane electrode assembly and an anode plate according to any one of claims 1 to 8, wherein the anode plate is provided with a second fuel gas inlet and a second fuel gas outlet which penetrate the anode plate in the thickness direction of the anode plate, and the second fuel gas inlet and the second fuel gas outlet are arranged at intervals; The membrane electrode assembly is sandwiched between the anode plate and the cathode plate, and the membrane electrode assembly is provided with a third fuel gas inlet and a third fuel gas outlet which penetrate the membrane electrode assembly along the thickness direction of the anode plate. The third fuel gas inlet is opposite to and connected with each of the first fuel gas inlet and the second fuel gas inlet in the thickness direction of the anode plate, and the third fuel gas outlet is opposite to and connected with each of the first fuel gas outlet and the second fuel gas outlet in the thickness direction of the anode plate.

10. A fuel cell stack, characterized in that: include: A plurality of fuel cells according to claim 9 are stacked one on top of another along the thickness direction of the anode plate, and in adjacent fuel cells, the cathode plate of one fuel cell is arranged adjacent to the anode plate of another fuel cell.

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