A bipolar plate

Abstract

The application discloses a bipolar plate, which comprises a bipolar plate body, an air flow field, a cooling flow field, a hydrogen flow field, an air inlet channel, a cooling liquid inlet channel, a hydrogen inlet channel, an air outlet channel, a cooling liquid outlet channel and a hydrogen outlet channel; the cooling flow field comprises a cooling flow field cavity formed in the bipolar plate body at a position corresponding to the reaction area and a cooling flow field dot matrix arranged in the cooling flow field cavity; the cooling flow field dot matrix comprises a plurality of supporting dots which are arranged at intervals in the cooling flow field cavity and used for supporting two cavity walls of the cooling flow field cavity. The bipolar plate can be cooled better by the cooling flow field.

Description

Technical Field

[0001] This invention relates to the field of fuel cell technology, and in particular to a bipolar plate. Background Technology

[0002] Bipolar plates are one of the core components of fuel cells, often referred to as the "skeleton" of the fuel cell stack. They serve to collect and conduct current, separate reactant gases, support the cells, and provide cooling, directly determining the stack's output power and lifespan.

[0003] The bipolar plate includes a bipolar plate body, an air flow field, a cooling flow field, a hydrogen flow field, an air inlet channel, an air outlet channel, a coolant inlet channel, a coolant outlet channel, a hydrogen inlet channel, and a hydrogen outlet channel. The air flow field, cooling flow field, and hydrogen flow field are all located in the reaction zone. Air is pumped into the air flow field through the air inlet channel by an air pump, and then discharged through the air outlet channel. Coolant is pumped into the cooling flow field through the coolant inlet channel by a water pump, and then discharged through the coolant outlet channel. Hydrogen is pumped into the hydrogen flow field through the hydrogen inlet channel by a hydrogen pump, and any remaining hydrogen gas is discharged through the hydrogen outlet channel. Currently, the flow channel designs for the cooling flow field, air flow field, and hydrogen flow field are mainly parallel channels or serpentine channels. Both types of channels include multiple sub-channels, each separated by partitions. Both types of channels have the following drawbacks:

[0004] 1. The partition occupies a large area in the cooling flow field, resulting in a small coverage area of ​​the bipolar plate by the flow channels in the cooling flow field, which in turn leads to a poor cooling effect of the cooling flow field on the bipolar plate.

[0005] 2. The separation part occupies a large area in the air flow field and the hydrogen flow field. The contact area between the air entering the air flow field and the corresponding membrane electrode is small, and the contact area between the hydrogen entering the hydrogen flow field and the corresponding membrane electrode is also small, resulting in low energy conversion efficiency.

[0006] 3. The air flows at a high speed in the air flow field, and the hydrogen flows at a high speed in the hydrogen flow field, resulting in incomplete reaction of the hydrogen flowing through the hydrogen flow field and low energy utilization.

[0007] 4. In abnormal situations, such as when the hydrogen pump suddenly fails, the pressure at the hydrogen inlet channel will drop sharply. The gas at the hydrogen outlet channel (i.e., the rarefied hydrogen remaining after the reaction) is prone to rapid backflow, which will quickly lead to a shortage of reaction gas in the hydrogen flow field. This may cause the battery cell to momentarily reverse polarity, which may lead to the burning out of the battery stack. Summary of the Invention

[0008] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a bipolar plate with good cooling effect.

[0009] To solve the above-mentioned technical problems, one technical solution adopted by the present invention is: providing a bipolar plate, including a bipolar plate body, an air flow field formed on a first side of the bipolar plate body corresponding to the reaction zone position, a cooling flow field formed within the bipolar plate body corresponding to the reaction zone position, a hydrogen flow field formed on a second side of the bipolar plate body opposite to the first side, corresponding to the reaction zone position, an air inlet channel, a coolant inlet channel, and a hydrogen flow field respectively connected to the air flow field, the cooling flow field, and the hydrogen flow field at a first end of the bipolar plate body, and an air outlet channel, a coolant outlet channel, and a hydrogen outlet channel respectively connected to the air flow field, the cooling flow field, and the hydrogen flow field at a second end of the bipolar plate body; the cooling flow field includes a cooling flow field cavity formed within the bipolar plate body corresponding to the reaction zone position and a cooling flow field lattice disposed within the cooling flow field cavity, the cooling flow field lattice including a plurality of support points spaced apart within the cooling flow field cavity and used to support the two cavity walls of the cooling flow field cavity.

[0010] Furthermore, the airflow field includes an airflow field cavity located between the first side surface of the bipolar plate body and a membrane electrode and corresponding to the position of the reaction zone, and an airflow field lattice disposed in the airflow field cavity. The airflow field lattice includes a plurality of first lattice groups arranged longitudinally and laterally in the airflow field cavity, and each first lattice group includes a plurality of first protrusions arranged in a polygonal pattern.

[0011] Furthermore, the hydrogen flow field includes a hydrogen flow field cavity located between the second side of the bipolar plate body and another membrane electrode and corresponding to the position of the reaction zone, and a hydrogen flow field lattice disposed in the hydrogen flow field cavity. The hydrogen flow field lattice includes a plurality of second lattice groups arranged longitudinally and laterally in the hydrogen flow field cavity, and each second lattice group includes a plurality of second protrusions arranged in a polygonal pattern.

[0012] Furthermore, the airflow field includes an airflow field cavity located between the first side surface of the bipolar plate body and a membrane electrode, corresponding to the position of the reaction zone, and an airflow field lattice disposed within the airflow field cavity for blocking and diverting the air flowing through the airflow field cavity.

[0013] Furthermore, the airflow field lattice includes multiple rows of first strip-shaped protrusions arranged sequentially from the first end to the second end of the bipolar plate body within the airflow field cavity. Each first strip-shaped protrusion is inclined relative to its arrangement direction. The first strip-shaped protrusions in each two adjacent rows of first strip-shaped protrusions are inclined in opposite directions. In each two adjacent rows of first strip-shaped protrusions, the first strip-shaped protrusions in one row are directly opposite the interval between two adjacent first strip-shaped protrusions in the other row.

[0014] Furthermore, the airflow field lattice includes multiple rows of first V-shaped convex hulls with openings facing the second end, arranged sequentially from the first end to the second end of the bipolar plate body within the airflow field cavity. In each pair of adjacent rows of the first V-shaped convex hulls, the first V-shaped convex hull in one row is directly opposite the interval between two adjacent first V-shaped convex hulls in the other row. The opening width of the first V-shaped convex hull in one row is not less than the interval between two adjacent first V-shaped convex hulls in the other row.

[0015] Furthermore, the hydrogen flow field includes a hydrogen flow field cavity located between the second side of the bipolar plate body and another membrane electrode and corresponding to the position of the reaction zone, and a hydrogen flow field array disposed within the hydrogen flow field cavity for blocking and diverting the hydrogen flowing through the hydrogen flow field cavity.

[0016] Furthermore, the hydrogen flow field array includes multiple rows of second strip-shaped protrusions arranged sequentially from the first end to the second end of the bipolar plate body within the hydrogen flow field cavity. Each second strip-shaped protrusion is inclined relative to its arrangement direction. The second strip-shaped protrusions in each two adjacent rows of second strip-shaped protrusions are inclined in opposite directions. In each two adjacent rows of second strip-shaped protrusions, the second strip-shaped protrusions in one row are directly opposite the interval between two adjacent second strip-shaped protrusions in the other row.

[0017] Furthermore, the hydrogen flow field lattice includes multiple rows of second V-shaped protrusions with openings facing the second end, arranged sequentially from the first end to the second end of the bipolar plate body within the hydrogen flow field cavity. In each pair of adjacent rows of second V-shaped protrusions, the second V-shaped protrusion in one row is directly opposite the interval between two adjacent second V-shaped protrusions in the other row. The opening width of the second V-shaped protrusion in one row is not less than the interval between two adjacent second V-shaped protrusions in the other row.

[0018] Furthermore, the air inlet channel and the air outlet channel are respectively located at two opposite corners of the air flow field, and the hydrogen inlet channel and the hydrogen outlet channel are respectively located at two opposite corners of the hydrogen flow field.

[0019] Due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0020] The cooling flow field lattice includes multiple support points spaced apart within the cooling flow field cavity to support the two cavity walls. Except for the portion occupied by each support point, the remaining portion of the cooling flow field cavity consists of coolant channels for coolant flow, allowing the coolant channels to cover a larger area of ​​the bipolar plate body, thus improving the cooling effect of the cooling flow field on the bipolar plate. The cooling flow field lattice also supports the two cavity walls of the cooling flow field cavity, preventing dents and deformation of the bipolar plate body at the location corresponding to the cooling flow field cavity when the bipolar plate is press-fitted into a fuel cell stack. Attached Figure Description

[0021] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0022] Figure 1 This is a schematic diagram of the structure of a preferred embodiment of the bipolar plate of the present invention as viewed from one perspective;

[0023] Figure 2 yes Figure 1 Enlarged view of 'a' in the middle;

[0024] Figure 3 yes Figure 1 Enlarged view of b in the middle;

[0025] Figure 4 yes Figure 1 Enlarged view of C in the middle;

[0026] Figure 5 yes Figure 1 Enlarged view of d in the middle;

[0027] Figure 6 This is a structural schematic diagram of a preferred embodiment of the bipolar plate of the present invention viewed from another perspective;

[0028] Figure 7 yes Figure 6 Enlarged view of 'e' in the middle;

[0029] Figure 8 yes Figure 6 Enlarged view of f in the middle;

[0030] Figure 9 yes Figure 6 Enlarged view of g in the middle;

[0031] Figure 10 yes Figure 6 Enlarged view of h in the middle;

[0032] Figure 11 This is a schematic diagram of the cathode plate in a preferred embodiment of the bipolar plate of the present invention;

[0033] Figure 12 This is a schematic diagram of the anode plate in a preferred embodiment of the bipolar plate of the present invention;

[0034] Figure 13 yes Figure 12 Enlarged view of i in the middle;

[0035] Figure 14 This is a schematic diagram of the structure of another preferred embodiment of the bipolar plate of the present invention as viewed from one perspective;

[0036] Figure 15 yes Figure 14 Enlarged view of j in the middle;

[0037] Figure 16 This is a schematic diagram of the structure of another preferred embodiment of the bipolar plate of the present invention viewed from another perspective;

[0038] Figure 17 yes Figure 16 Enlarged view of k in the middle;

[0039] Figure 18 This is a schematic diagram of the cathode plate in another preferred embodiment of the bipolar plate of the present invention;

[0040] Figure 19 yes Figure 18 A schematic diagram of the structure of the middle l;

[0041] Figure 20 This is a schematic diagram of the anode plate in another preferred embodiment of the bipolar plate of the present invention;

[0042] Figure 21 yes Figure 20 Enlarged view of m in the middle;

[0043] Figure 22 This is a schematic diagram of the structure of another preferred embodiment of the bipolar plate of the present invention as viewed from one perspective;

[0044] Figure 23 yes Figure 22 Enlarged view of n;

[0045] Figure 24This is a structural schematic diagram of another preferred embodiment of the bipolar plate of the present invention viewed from another perspective.

[0046] Figure 25 yes Figure 24 Enlarged view of the character "o" in the middle;

[0047] Figure 26 This is a schematic diagram of the cathode plate in another preferred embodiment of the bipolar plate of the present invention;

[0048] Figure 27 yes Figure 26 Enlarged view of p in the middle;

[0049] Figure 28 This is a schematic diagram of the anode plate in another preferred embodiment of the bipolar plate of the present invention;

[0050] Figure 29 yes Figure 28 A magnified view of q.

[0051] The meanings of the labels in the attached diagram are as follows:

[0052] Bipolar plate body - 1a, 1b, 1c; Air flow field - 2a, 2b, 2c; Cooling flow field - 3a, 3b, 3c; Hydrogen flow field - 4c, 4b, 4c; Air inlet channel - 5a, 5b, 5c; Coolant inlet channel - 6a, 6b, 6c; Hydrogen inlet channel - 7a, 7b, 7c; Air outlet channel - 8a, 8b, 8c; Coolant outlet channel - 9a, 9b, 9c; Hydrogen outlet channel - 10a, 10b, 10c; Cathode plate - 11a, 11b, 11c; Anode plate - 12a 12b, 12c; First cooling flow field grooves - 111a, 111b, 111c; Air flow field grooves - 112a, 112b, 112c; Second cooling flow field grooves - 121a, 121b, 121c; Hydrogen flow field grooves - 122a, 122b, 122c; Air flow field cavities - 21a, 21b, 21c; Air flow field lattice - 22a, 22b, 22c; First convex point - 221a; First strip-shaped convex hull - 221b; First V-shaped convex hull - 221c; Cooling flow field cavities - 31a, 31b, 31c Cooling flow field lattice - 32a, 32b, 32c; Support points - 321a, 321b, 321c; Hydrogen flow field cavity - 41a, 41b, 41c; Hydrogen flow field lattice - 42a, 42b, 42c; Second convex point - 421a; Second strip convex hull - 421b, Second V-shaped convex hull - 421c; Third convex point - 3211b, 3211c; Fourth convex point - 3212b, 3212c; Air inlet - 51a, 51b, 51c; First connecting channel - 52a, 52b, 52c; Coolant inlet First connecting channels - 61a, 61b, 61c; Second connecting channels - 62a, 62b, 62c; Hydrogen inlet - 71a, 71b, 71c; Third connecting channels - 72a, 72b, 72c; Air outlet - 81a, 81b, 81c; Fourth connecting channels - 82a, 82b, 82c; Coolant outlet - 91a, 91b, 91c; Fifth connecting channels - 92a, 92b, 92c; Hydrogen outlet - 101a, 101b, 101c; Sixth connecting channels - 102a, 102b, 102c. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0054] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0056] Example 1

[0057] like Figure 1 , Figure 6 , Figure 11 and Figure 12 As shown, an embodiment of a bipolar plate according to the present invention includes a bipolar plate body 1a, an air flow field 2a, a cooling flow field 3a, a hydrogen flow field 4a, an air inlet channel 5a, a coolant inlet channel 6a, a hydrogen inlet channel 7a, an air outlet channel 8a, a coolant outlet channel 9a, and a hydrogen outlet channel 10a. The air flow field 2a is formed on the first side of the bipolar plate body 1a corresponding to the reaction zone position. The cooling flow field 3a is formed inside the bipolar plate body 1a corresponding to the reaction zone position. The hydrogen flow field 4a is formed on the second side of the bipolar plate body 1a opposite to the first side, corresponding to the reaction zone position. The air inlet channel 5a, the coolant inlet channel 6a, and the hydrogen inlet channel 7a are all located at the first end of the bipolar plate body 1a. The air inlet channel 5a, the coolant inlet channel 6a, and the hydrogen inlet channel 7a are respectively connected to the air flow field 2a, the coolant inlet channel 6a, and the hydrogen inlet channel 7a. The cooling flow field 3a and the hydrogen flow field 4a are connected. The air exhaust channel 8a, the coolant exhaust channel 9a, and the hydrogen exhaust channel 10a are located at the second end of the bipolar plate body 1a. The air exhaust channel 8a, the coolant exhaust channel 9a, and the hydrogen exhaust channel 10a are respectively connected to the air flow field 2a, the cooling flow field 3a, and the hydrogen flow field 4a. During use, the air pump pumps air into the air flow field 2a through the air inlet channel 5a for reaction. The reacted air is discharged from the air flow field 2a through the air exhaust channel 8a. The water pump pumps coolant into the cooling flow field 3a through the coolant inlet channel 6a to cool the bipolar plate body 1a. Then, the coolant is discharged from the cooling flow field 3a through the coolant exhaust channel 9a. The hydrogen pump pumps hydrogen into the hydrogen flow field 4a through the hydrogen inlet channel 7a for reaction. The remaining hydrogen after reaction is discharged from the hydrogen flow field 4a through the hydrogen exhaust channel 10a.

[0058] The bipolar plate body 1a includes a cathode plate 11a and an anode plate 12a, which are stacked opposite each other. The inner side of the cathode plate 11a is recessed outward at the position corresponding to the cooling flow field 3a to form a first cooling flow field groove 111a. The outer side of the cathode plate 11a is recessed inward at the position corresponding to the air flow field 2a to form an air flow field groove 112a. The inner side of the anode plate 12a is recessed outward at the position corresponding to the first cooling flow field groove 111a to form a second cooling flow field groove 121a. The outer side of the anode plate 12a is recessed inward at the position corresponding to the hydrogen flow field 4a to form a hydrogen flow field groove 122a.

[0059] like Figure 1 and Figure 2 As shown, the airflow field 2a includes an airflow field cavity 21a and an airflow field lattice 22a. The airflow field cavity 21a is located between the first side of the bipolar plate body 1a and a membrane electrode, corresponding to the reaction zone. Specifically, the airflow field cavity 21a is located between the outer side of the cathode plate 11a and the membrane electrode (not shown in the figure), corresponding to the reaction zone. The airflow field cavity 21a is formed by the airflow field groove 112a and the side of the membrane electrode facing the cathode plate 11a. A dot matrix 22a is disposed within the airflow cavity 21a. The airflow cavity dot matrix 22a includes multiple first dot matrix groups, which are arranged longitudinally and laterally within the airflow cavity 21a. Each first dot matrix group includes multiple first protrusions 221a, which are arranged in a polygonal pattern. For example, a first dot matrix group may include six first protrusions 221a arranged in a hexagonal pattern, or three first protrusions 221a arranged in a triangular pattern. Specifically, the first protrusions 221a protrude outward from the bottom wall of the airflow groove 112a. This airflow structure reduces the occupancy of the reaction area by the partitions of existing flow channels, thereby improving oxygen reaction efficiency and fuel cell performance.

[0060] like Figure 11 , Figure 12 and Figure 13As shown, the cooling flow field 3a includes a cooling flow field cavity 31a and a cooling flow field lattice 32a. The cooling flow field cavity 31a is formed within the bipolar plate body 1a at a position corresponding to the reaction zone. Specifically, the cooling flow field cavity 31a is formed between the cathode plate 11a and the anode plate 12a at a position corresponding to the reaction zone. The cooling flow field cavity 31a is formed by the first cooling flow field groove 111a and the second cooling flow field groove 121a arranged opposite each other. The cooling flow field lattice 32a is disposed within the cooling flow field cavity 31a. The cooling flow field lattice 32a includes cooling flow field lattices arranged at intervals within the cooling flow field cavity 31a. Multiple support points 321a are provided within the cooling flow field cavity 31a to support the two walls of the cooling flow field cavity 31a. Specifically, the support points 321a protrude from the bottom wall of the second cooling flow field groove 121a toward the cathode plate 11a, and one end of the support point 321a facing the cathode plate 11a abuts against the cathode plate 11a. It can be understood that in some embodiments, the support points 321a may also protrude from the bottom wall of the first cooling flow field groove 111a toward the anode plate 12a, and one end of the support point 321a facing the anode plate 12a abuts against the anode plate 12a. Except for the portion occupied by each of the support points 321a, the remaining portion of the cooling flow field cavity 31a consists of coolant channels for coolant flow, which increases the area covered by the coolant channels in the cooling flow field cavity 31a and improves the cooling effect of the cooling flow field 3a on the bipolar plate. The cooling flow field lattice 32a also supports the two cavity walls of the cooling flow field cavity 31a, preventing the bipolar plate body 1a from being concave or deformed at the position corresponding to the cooling flow field cavity 31a when the bipolar plate is press-fitted into a fuel cell stack.

[0061] like Figure 6 and Figure 7As shown, the hydrogen flow field 4a includes a hydrogen flow field cavity 41a and a hydrogen flow field lattice 42a. The hydrogen flow field cavity 41a is located between the second side of the bipolar plate body 1a and another membrane electrode (not shown in the figure) corresponding to the reaction zone position. Specifically, the hydrogen flow field cavity 41a is located between the outer side of the anode plate 12a and the other membrane electrode corresponding to the reaction zone position. The hydrogen flow field cavity 41a is enclosed by the hydrogen flow field groove 122a and the side of the other membrane electrode facing the anode plate 12a. The hydrogen flow... A field lattice 42a is disposed within the hydrogen flow field cavity 41a. The hydrogen flow field lattice 42a includes multiple second lattice groups, which are arranged longitudinally and laterally within the hydrogen flow field cavity 41a. Each second lattice group includes multiple second protrusions 421a, which are arranged in a polygonal pattern. For example, a second lattice group may include six second protrusions 421a arranged in a hexagonal pattern, or three second protrusions 421a arranged in a triangular pattern. Specifically, the second protrusions 421a protrude outward from the bottom wall of the hydrogen flow field groove 122a. This hydrogen flow field structure reduces the occupancy of the reaction area by the partitions of existing flow channels, thereby improving hydrogen reaction efficiency and stack performance.

[0062] like Figure 1 and Figure 3 As shown, the air inlet channel 5a includes an air inlet 51a and a first connecting channel 52a. The air inlet 51a is located at the first end of the bipolar plate body 1a and penetrates perpendicularly through the bipolar plate body 1a. Specifically, the air inlet 51a is located at the first end of the cathode plate 11a and the anode plate 12a and penetrates perpendicularly through the cathode plate 11a and the anode plate 12a. The first connecting channel 52a is located inside the bipolar plate body 1a. Specifically, the first connecting channel 52a is located between the cathode plate 11a and the anode plate 12a. The first end of the first connecting channel 52a connects to the air inlet 51a, and the second end of the first connecting channel 52a extends to the first side of the bipolar plate body 1a and connects to the air flow field cavity 21a. Specifically, the second end of the first connecting channel 52a penetrates the cathode plate 11a and connects to the air flow field cavity 21a. Air pumped to the air inlet 51a by the air pump can enter the air flow field cavity 21a through the first connecting channel 52a.

[0063] like Figure 1 and Figure 4As shown, the coolant inlet channel 6a includes a coolant inlet 61a and a second connecting channel 62a. The coolant inlet 61a is located at the first end of the bipolar plate body 1a and penetrates perpendicularly through the bipolar plate body 1a. Specifically, the coolant inlet 61a is located at the first end of the cathode plate 11a and the anode plate 12a and penetrates perpendicularly through the cathode plate 11a and the anode plate 12a. The second connecting channel 62a is located inside the bipolar plate body 1a. Specifically, the second connecting channel 62a is located between the cathode plate 11a and the anode plate 12a. The first end of the second connecting channel 62a is connected to the coolant inlet 61a, and the second end of the second connecting channel 62a is connected to the cooling flow field cavity 31a. The coolant pumped to the coolant inlet 61a by the water pump can enter the cooling flow field cavity 31a through the second connecting channel 62a.

[0064] like Figure 1 and Figure 5 As shown, the hydrogen inlet channel 7a includes a hydrogen inlet 71a and a third connecting channel 72a. The hydrogen inlet 71a is located at the first end of the bipolar plate body 1a and penetrates the bipolar plate body 1a perpendicularly. Specifically, the hydrogen inlet 71a is located at the first end of the cathode plate 11a and the anode plate 12a and penetrates the cathode plate 11a and the anode plate 12a perpendicularly. The third connecting channel 72a is located inside the bipolar plate body 1a. Specifically, the third connecting channel 72a is located between the cathode plate 11a and the anode plate 12a. The first end of the third connecting channel 72a is connected to the hydrogen inlet 71a, and the second end of the third connecting channel 72a extends to the second side of the bipolar plate body 1a and is connected to the hydrogen flow field cavity 41a. Specifically, the second end of the third connecting channel 72a penetrates the anode plate 12a and is connected to the hydrogen flow field cavity 41a. Hydrogen pumped to the hydrogen inlet 71a by the hydrogen pump can enter the hydrogen flow field cavity 41a through the third connecting channel 72a.

[0065] like Figure 6 and Figure 8As shown, the air exhaust channel 8a includes an air outlet 81a and a fourth connecting channel 82a. The air outlet 81a is located at the second end of the bipolar plate body 1a and penetrates the bipolar plate body 1a perpendicularly. Specifically, the air outlet 81a is located at the second end of the cathode plate 11a and the anode plate 12a and penetrates the cathode plate 11a and the anode plate 12a perpendicularly. The fourth connecting channel 82a is located inside the bipolar plate body 1a. Specifically, the fourth connecting channel 82a is located between the cathode plate 11a and the anode plate 12a. The first end of the fourth connecting channel 82a is connected to the air outlet 81a, and the second end of the fourth connecting channel 82a extends to the first side of the bipolar plate body 1a and is connected to the air flow field cavity 21a. Specifically, the second end of the fourth connecting channel 82a penetrates the cathode plate 11a and is connected to the air flow field cavity 21a. The air, after reacting within the airflow cavity 21a, enters the air outlet 81a via the fourth connecting channel 82a and is then discharged from the air outlet 81a. The fourth connecting channel 82a and the first connecting channel 52a are located at opposite corners of the airflow cavity 21a, respectively. That is, the air inlet channel 5a and the air outlet channel 8a are located at opposite corners of the airflow cavity 2a. This structure increases the length of the airflow path within the airflow cavity 2a.

[0066] like Figure 6 and Figure 9 As shown, the coolant discharge channel 9a includes a coolant outlet 91a and a fifth connecting channel 92a. The coolant outlet 91a is located at the second end of the bipolar plate body 1a and penetrates the bipolar plate body 1a perpendicularly. Specifically, the coolant outlet 91a is located at the second end of the cathode plate 11a and the anode plate 12a and penetrates the cathode plate 11a and the anode plate 12a perpendicularly. The fifth connecting channel 92a is located inside the bipolar plate body 1a. Specifically, the fifth connecting channel 92a is located between the cathode plate 11a and the anode plate 12a. The first end of the fifth connecting channel 92a is connected to the coolant outlet 91a, and the second end of the fifth connecting channel 92a is connected to the cooling flow field cavity 31a. The coolant flowing through the cooling flow field cavity 31a can enter the coolant outlet 91a through the fifth connecting channel 92a and then be discharged from the coolant outlet 91a.

[0067] like Figure 6 and Figure 10As shown, the hydrogen exhaust channel 10a includes a hydrogen outlet 101a and a sixth connecting channel 102a. The hydrogen outlet 101a is located at the second end of the bipolar plate body 1a and penetrates the bipolar plate body 1a perpendicularly. Specifically, the hydrogen outlet 101a is located at the second end of the cathode plate 11a and the anode plate 12a and penetrates the cathode plate 11a and the anode plate 12a perpendicularly. The sixth connecting channel 102a is located inside the bipolar plate body 1a. Specifically, the sixth connecting channel 102a is located between the cathode plate 11a and the anode plate 12a. The first end of the sixth connecting channel 102a is connected to the hydrogen outlet 101a, and the second end of the sixth connecting channel 102a extends to the second side of the bipolar plate body 1a and is connected to the hydrogen flow field cavity 41a. Specifically, the second end of the sixth connecting channel 102a penetrates the anode plate 12a and is connected to the hydrogen flow field cavity 41a. The remaining hydrogen gas after reaction within the hydrogen flow field cavity 41a can enter the hydrogen outlet 101a through the sixth connecting channel 102a and then exit through the hydrogen outlet 101a. The positions of the third connecting channel 72a and the sixth connecting channel 102a connecting the hydrogen flow field cavity 41a are respectively located at opposite corners of the hydrogen flow field cavity 41a, that is, the hydrogen inlet channel 7a and the hydrogen outlet channel 10a are located at opposite corners of the hydrogen flow field 4a. With this structure, the length of the hydrogen flow path within the hydrogen flow field 4a can be increased, allowing for a more complete hydrogen reaction, reducing hydrogen waste, and improving energy utilization efficiency.

[0068] Example 2

[0069] like Figure 14 , Figure 16 , Figure 18 and Figure 20As shown, an embodiment of a bipolar plate according to the present invention includes a bipolar plate body 1b, an air flow field 2b, a cooling flow field 3b, a hydrogen flow field 4b, an air inlet channel 5b, a coolant inlet channel 6b, a hydrogen inlet channel 7b, an air outlet channel 8b, a coolant outlet channel 9b, and a hydrogen outlet channel 10b. The air flow field 2b is formed on the first side of the bipolar plate body 1b corresponding to the reaction zone position. The cooling flow field 3b is formed inside the bipolar plate body 1b corresponding to the reaction zone position. The hydrogen flow field 4b is formed on the second side of the bipolar plate body 1b opposite to the first side, corresponding to the reaction zone position. The air inlet channel 5b, the coolant inlet channel 6b, and the hydrogen inlet channel 7b are all located at the first end of the bipolar plate body 1b. The air inlet channel 5b, the coolant inlet channel 6b, and the hydrogen inlet channel 7b are respectively connected to the air flow field 2b, the air inlet channel 6b, the coolant inlet channel 9b, and the hydrogen inlet channel 10b. The cooling flow field 3b and the hydrogen flow field 4b are connected. The air exhaust channel 8b, the coolant exhaust channel 9b, and the hydrogen exhaust channel 10b are located at the second end of the bipolar plate body 1b. The air exhaust channel 8b, the coolant exhaust channel 9b, and the hydrogen exhaust channel 10b are respectively connected to the air flow field 2b, the cooling flow field 3b, and the hydrogen flow field 4b. During use, the air pump pumps air into the air flow field 2b through the air inlet channel 5b for reaction. The reacted air is then discharged from the air flow field 2b through the air exhaust channel 8b. The water pump pumps coolant into the cooling flow field 3b through the coolant inlet channel 6b to cool the bipolar plate body 1b. The coolant is then discharged from the cooling flow field 3b through the coolant exhaust channel 9b. The hydrogen pump pumps hydrogen into the hydrogen flow field 4b through the hydrogen inlet channel 7b for reaction. The remaining hydrogen after reaction is discharged from the hydrogen flow field 4b through the hydrogen exhaust channel 10b.

[0070] The bipolar plate body 1b includes a cathode plate 11b and an anode plate 12b, which are stacked opposite each other. The inner side of the cathode plate 11b is recessed outward at the position corresponding to the cooling flow field 3b to form a first cooling flow field groove 111b. The outer side of the cathode plate 11b is recessed inward at the position corresponding to the air flow field 2b to form an air flow field groove 112b. The inner side of the anode plate 12b is recessed outward at the position corresponding to the first cooling flow field groove 111b to form a second cooling flow field groove 121b. The outer side of the anode plate 12b is recessed inward at the position corresponding to the hydrogen flow field 4b to form a hydrogen flow field groove 122b.

[0071] like Figure 14 and Figure 15As shown, the airflow field 2b includes an airflow field cavity 21b and an airflow field array 22b. The airflow field cavity 21b is located between the first side of the bipolar plate body 1b and a membrane electrode, corresponding to the reaction zone. Specifically, the airflow field cavity 21b is located between the outer side of the cathode plate 11b and the membrane electrode (not shown in the figure), corresponding to the reaction zone. The airflow field cavity 21b is enclosed by the airflow field groove 112b and the side of the membrane electrode facing the cathode plate 11b. The airflow field array 22b is disposed within the airflow field cavity 21b and is used to block and divert the air flowing through the airflow field cavity 21b. The airflow field lattice 22b includes multiple rows of first strip-shaped protrusions 221b. These multiple rows of first strip-shaped protrusions 221b are arranged sequentially from the first end to the second end of the bipolar plate body 1b within the airflow field cavity 21b. Specifically, the first strip-shaped protrusions 221b protrude outward from the bottom wall of the airflow field groove 112b. The multiple rows of first strip-shaped protrusions 221b are arranged sequentially from the first end to the second end of the cathode plate 11b within the airflow field groove 112b. Each first strip-shaped protrusion 221b is inclined relative to its arrangement direction. The first strip-shaped protrusions 221b in each adjacent row of first strip-shaped protrusions 221b have opposite inclination directions. In each adjacent row of first strip-shaped protrusions 221b, the first strip-shaped protrusion 221b in one row is directly opposite the interval between two adjacent first strip-shaped protrusions 221b in the other row. Air flowing through the gap between two adjacent first stripe convex hulls 221b in a row of first stripe convex hulls 221b will be blocked and diverted by the first stripe convex hull 221b in another row of first stripe convex hulls 221b adjacent to the row of first stripe convex hulls 221b, which is directly opposite the gap. As the air flows through the airflow field lattice 22b, it is continuously blocked and diverted, allowing the air to be more evenly distributed within the airflow field cavity 21b, thus improving the fuel cell stack performance. It is understood that in some embodiments, the airflow field 2b can also be the airflow field 2b structure described in Embodiment 1 above.

[0072] like Figure 18 , Figure 19 , Figure 20 and Figure 21As shown, the cooling flow field 3b includes a cooling flow field cavity 31b and a cooling flow field lattice 32b. The cooling flow field cavity 31b is formed within the bipolar plate body 1b at a position corresponding to the reaction zone. Specifically, the cooling flow field cavity 31b is formed between the cathode plate 11b and the anode plate 12b at a position corresponding to the reaction zone. The cooling flow field cavity 31b is formed by the first cooling flow field groove 111b and the second cooling flow field groove 121b arranged opposite each other. The cooling flow field lattice 32b is disposed within the cooling flow field cavity 31b. 32b includes a plurality of support points 321b spaced apart within the cooling flow field cavity 31b and used to support the two cavity walls of the cooling flow field cavity 31b. Specifically, the support points 321b include a third protrusion 3211b protruding from the bottom wall of the first cooling flow field groove 111b toward the anode plate 12b and a fourth protrusion 3212b protruding from the bottom wall of the second cooling flow field groove 121b at a position corresponding to the third protrusion 3211b toward the cathode plate 11b. The fourth protrusion 3212b and the third protrusion 3211b abut against each other. It is understood that in some embodiments, the support point 321b may also be formed by protruding directly from the bottom wall of the second cooling flow field tank 121b toward the cathode plate 11b, with one end of the support point 321b facing the cathode plate 11b abutting against the cathode plate 11b. In other embodiments, the support point 321b may also be formed by protruding from the bottom wall of the first cooling flow field tank 111b toward the anode plate 12b, with one end of the support point 321b facing the anode plate 12b abutting against the anode plate 12b. Except for the portion occupied by each of the support points 321b, the remaining portion of the cooling flow field cavity 31b is a coolant flow channel for coolant circulation, which makes the area covered by the coolant flow channel in the cooling flow field cavity 31b larger, thus enabling the cooling field 3b to have a better cooling effect on the bipolar plate. The cooling flow field lattice 32b can also support the two cavity walls of the cooling flow field cavity 31b, preventing the bipolar plate body 1b from being concave or deformed at the position corresponding to the cooling flow field cavity 31b when the bipolar plate is press-fitted into a fuel cell stack.

[0073] like Figure 16 and Figure 17As shown, the hydrogen flow field 4b includes a hydrogen flow field cavity 41b and a hydrogen flow field array 42b. The hydrogen flow field cavity 41b is located between the second side of the bipolar plate body 1b and another membrane electrode (not shown in the figure) corresponding to the reaction zone. Specifically, the hydrogen flow field cavity 41b is located between the outer side of the anode plate 12b and the other membrane electrode corresponding to the reaction zone. The hydrogen flow field cavity 41b is enclosed by the hydrogen flow field groove 122b and the side of the other membrane electrode facing the anode plate 12b. The hydrogen flow field array 42b is disposed within the hydrogen flow field cavity 41b and is used to block and divert the hydrogen flowing through the hydrogen flow field cavity 41b. The hydrogen flow field array 42b includes multiple rows of second strip-shaped protrusions 421b. These multiple rows of second strip-shaped protrusions 421b are arranged sequentially from the first end to the second end of the bipolar plate body 1b within the hydrogen flow field cavity 41b. Specifically, the second strip-shaped protrusions 421b protrude outward from the bottom wall of the hydrogen flow field groove 122b. The multiple rows of second strip-shaped protrusions 421b are arranged sequentially from the first end to the second end of the anode plate 12b within the hydrogen flow field groove 122b. Each second strip-shaped protrusion 421b is inclined relative to its arrangement direction. The inclination directions of the second strip-shaped protrusions 421b in each adjacent row are opposite. In each adjacent row of second strip-shaped protrusions 421b, the second strip-shaped protrusions 421b in one row are directly opposite the interval between two adjacent second strip-shaped protrusions 421b in the other row. After hydrogen flows through the gap between two adjacent second strip convex 421b in a row of second strip convex 421b, it will be blocked and diverted by the second strip convex 421b in another row of second strip convex 421b adjacent to the row of second strip convex 421b, which is directly opposite the gap. As the hydrogen flows through the hydrogen flow field lattice 42b, it will be continuously blocked and diverted, which can make the hydrogen more uniformly distributed in the hydrogen flow field cavity 41b, thereby improving the performance of the fuel cell stack. The second strip-shaped convex 421b, by obstructing and diverting the hydrogen flow, reduces the hydrogen velocity, allowing for a more complete reaction and improving energy efficiency. In abnormal situations, such as a sudden failure of the hydrogen pump, it reduces the backflow velocity at the hydrogen discharge channel 10b. For a period after the pump failure, the hydrogen flow field 4b maintains a sufficient amount of reactant gas to continue the reaction, preventing instantaneous reverse polarity and allowing the user to take emergency measures, thus reducing the risk of the fuel cell stack burning out. It is understood that in some embodiments, the hydrogen flow field 4b can also be the structure described in Embodiment 1 above.

[0074] like Figure 14As shown, the air inlet channel 5b includes an air inlet 51b and a first connecting channel 52b. The air inlet 51b is located at the first end of the bipolar plate body 1b and penetrates perpendicularly through the bipolar plate body 1b. Specifically, the air inlet 51b is located at the first end of the cathode plate 11b and the anode plate 12b and penetrates perpendicularly through the cathode plate 11b and the anode plate 12b. The first connecting channel 52b is located inside the bipolar plate body 1b. Specifically, the first connecting channel 52b is located between the cathode plate 11b and the anode plate 12b. The first end of the first connecting channel 52b is connected to the air inlet 51b, and the second end of the first connecting channel 52b extends to the first side of the bipolar plate body 1b and is connected to the air flow field cavity 21b. Specifically, the second end of the first connecting channel 52b penetrates the cathode plate 11b and is connected to the air flow field cavity 21b. Air pumped to the air inlet 51b by the air pump can enter the air flow field cavity 21b through the first connecting channel 52b.

[0075] The coolant inlet channel 6b includes a coolant inlet 61b and a second connecting channel 62b. The coolant inlet 61b is located at the first end of the bipolar plate body 1b and penetrates perpendicularly through the bipolar plate body 1b. Specifically, the coolant inlet 61b is located at the first end of the cathode plate 11b and the anode plate 12b and penetrates perpendicularly through the cathode plate 11b and the anode plate 12b. The second connecting channel 62b is located inside the bipolar plate body 1b. Specifically, the second connecting channel 62b is located between the cathode plate 11b and the anode plate 12b. The first end of the second connecting channel 62b is connected to the coolant inlet 61b, and the second end of the second connecting channel 62b is connected to the cooling flow field cavity 31b. Coolant pumped to the coolant inlet 61b by a water pump can enter the cooling flow field cavity 31b through the second connecting channel 62b.

[0076] The hydrogen inlet channel 7b includes a hydrogen inlet 71b and a third connecting channel 72b. The hydrogen inlet 71b is located at the first end of the bipolar plate body 1b and penetrates the bipolar plate body 1b perpendicularly. Specifically, the hydrogen inlet 71b is located at the first end of the cathode plate 11b and the anode plate 12b and penetrates the cathode plate 11b and the anode plate 12b perpendicularly. The third connecting channel 72b is located inside the bipolar plate body 1b. Specifically, the third connecting channel 72b is located between the cathode plate 11b and the anode plate 12b. The first end of the third connecting channel 72b is connected to the hydrogen inlet 71b, and the second end of the third connecting channel 72b extends to the second side of the bipolar plate body 1b and is connected to the hydrogen flow field cavity 41b. Specifically, the second end of the third connecting channel 72b penetrates the anode plate 12b and is connected to the hydrogen flow field cavity 41b. Hydrogen pumped to the hydrogen inlet 71b by the hydrogen pump can enter the hydrogen flow field cavity 41b through the third connecting channel 72b.

[0077] like Figure 16 As shown, the air exhaust channel 8b includes an air outlet 81b and a fourth connecting channel 82b. The air outlet 81b is located at the second end of the bipolar plate body 1b and penetrates the bipolar plate body 1b perpendicularly. Specifically, the air outlet 81b is located at the second end of the cathode plate 11b and the anode plate 12b and penetrates the cathode plate 11b and the anode plate 12b perpendicularly. The fourth connecting channel 82b is located inside the bipolar plate body 1b. Specifically, the fourth connecting channel 82b is located between the cathode plate 11b and the anode plate 12b. The first end of the fourth connecting channel 82b is connected to the air outlet 81b, and the second end of the fourth connecting channel 82b extends to the first side of the bipolar plate body 1b and is connected to the air flow field cavity 21b. Specifically, the second end of the fourth connecting channel 82b penetrates the cathode plate 11b and is connected to the air flow field cavity 21b. The air, after reacting within the airflow cavity 21b, enters the air outlet 81b via the fourth connecting channel 82b and is then discharged from the air outlet 81b. The fourth connecting channel 82b and the first connecting channel 52b are located at opposite corners of the airflow cavity 21b, respectively. That is, the air inlet channel 5b and the air outlet channel 8b are located at opposite corners of the airflow cavity 2b. This structure increases the length of the airflow path within the airflow cavity 2b.

[0078] The coolant discharge channel 9b includes a coolant outlet 91b and a fifth connecting channel 92b. The coolant outlet 91b is located at the second end of the bipolar plate body 1b and penetrates perpendicularly through the bipolar plate body 1b. Specifically, the coolant outlet 91b is located at the second end of the cathode plate 11b and the anode plate 12b and penetrates perpendicularly through the cathode plate 11b and the anode plate 12b. The fifth connecting channel 92b is located inside the bipolar plate body 1b. Specifically, the fifth connecting channel 92b is located between the cathode plate 11b and the anode plate 12b. The first end of the fifth connecting channel 92b is connected to the coolant outlet 91b, and the second end of the fifth connecting channel 92b is connected to the cooling flow field cavity 31b. The coolant flowing through the cooling flow field cavity 31b can enter the coolant outlet 91b through the fifth connecting channel 92b and then be discharged from the coolant outlet 91b.

[0079] The hydrogen exhaust channel 10b includes a hydrogen outlet 101b and a sixth connecting channel 102b. The hydrogen outlet 101b is located at the second end of the bipolar plate body 1b and penetrates the bipolar plate body 1b perpendicularly. Specifically, the hydrogen outlet 101b is located at the second end of the cathode plate 11b and the anode plate 12b and penetrates the cathode plate 11b and the anode plate 12b perpendicularly. The sixth connecting channel 102b is located inside the bipolar plate body 1b. Specifically, the sixth connecting channel 102b is located between the cathode plate 11b and the anode plate 12b. The first end of the sixth connecting channel 102b is connected to the hydrogen outlet 101b, and the second end of the sixth connecting channel 102b extends to the second side of the bipolar plate body 1b and is connected to the hydrogen flow field cavity 41b. Specifically, the second end of the sixth connecting channel 102b penetrates the anode plate 12b and is connected to the hydrogen flow field cavity 41b. The remaining hydrogen gas after reaction in the hydrogen flow field cavity 41b can enter the hydrogen outlet 101b through the sixth connecting channel 102b and then exit through the hydrogen outlet 101b. The positions of the third connecting channel 72b and the sixth connecting channel 102b connected to the hydrogen flow field cavity 41b are respectively located at two opposite corners of the hydrogen flow field cavity 41b, that is, the hydrogen inlet channel 7b and the hydrogen outlet channel 10b are respectively located at two opposite corners of the hydrogen flow field 4b. With this structure, the length of the flow path of hydrogen in the hydrogen flow field 4b can be increased, the hydrogen reaction can be more complete, hydrogen waste can be reduced, and energy utilization efficiency can be improved.

[0080] Example 3

[0081] like Figure 22 , Figure 24 , Figure 26 and Figure 28 As shown, an embodiment of a bipolar plate according to the present invention includes a bipolar plate body 1c, an air flow field 2c, a cooling flow field 3c, a hydrogen flow field 4c, an air inlet channel 5c, a coolant inlet channel 6c, a hydrogen inlet channel 7c, an air outlet channel 8c, a coolant outlet channel 9c, and a hydrogen outlet channel 10c. The air flow field 2c is formed on the first side of the bipolar plate body 1c corresponding to the reaction zone position. The cooling flow field 3c is formed inside the bipolar plate body 1c corresponding to the reaction zone position. The hydrogen flow field 4c is formed on the second side of the bipolar plate body 1c opposite to the first side, corresponding to the reaction zone position. The air inlet channel 5c, the coolant inlet channel 6c, and the hydrogen inlet channel 7c are all located at the first end of the bipolar plate body 1c. The air inlet channel 5c, the coolant inlet channel 6c, and the hydrogen inlet channel 7c are respectively connected to the air flow field 2c, the air inlet channel 6c, the coolant inlet channel 9c, and the hydrogen inlet channel 10c. The cooling flow field 3c and the hydrogen flow field 4c are connected. The air exhaust channel 8c, the coolant exhaust channel 9c, and the hydrogen exhaust channel 10c are located at the second end of the bipolar plate body 1c. The air exhaust channel 8c, the coolant exhaust channel 9c, and the hydrogen exhaust channel 10c are respectively connected to the air flow field 2c, the cooling flow field 3c, and the hydrogen flow field 4c. During use, the air pump pumps air into the air flow field 2c through the air inlet channel 5c for reaction. The reacted air is discharged from the air flow field 2c through the air exhaust channel 8c. The water pump pumps coolant into the cooling flow field 3c through the coolant inlet channel 6c to cool the bipolar plate body 1c. Then, the coolant is discharged from the cooling flow field 3c through the coolant exhaust channel 9c. The hydrogen pump pumps hydrogen into the hydrogen flow field 4c through the hydrogen inlet channel 7c for reaction. The remaining hydrogen after reaction is discharged from the hydrogen flow field 4c through the hydrogen exhaust channel 10c.

[0082] The bipolar plate body 1c includes a cathode plate 11c and an anode plate 12c, which are stacked opposite each other. The inner side of the cathode plate 11c is recessed outward at the position corresponding to the cooling flow field 3c to form a first cooling flow field groove 111c. The outer side of the cathode plate 11c is recessed inward at the position corresponding to the air flow field 2c to form an air flow field groove 112c. The inner side of the anode plate 12c is recessed outward at the position corresponding to the first cooling flow field groove 111c to form a second cooling flow field groove 121c. The outer side of the anode plate 12c is recessed inward at the position corresponding to the hydrogen flow field 4c to form a hydrogen flow field groove 122c.

[0083] like Figure 22 and Figure 23As shown, the airflow field 2c includes an airflow field cavity 21c and an airflow field array 22c. The airflow field cavity 21c is located between the first side of the bipolar plate body 1c and a membrane electrode, corresponding to the position of the reaction zone. Specifically, the airflow field cavity 21c is located between the outer side of the cathode plate 11c and the membrane electrode (not shown in the figure), corresponding to the position of the reaction zone. The airflow field cavity 21c is enclosed by the airflow field groove 112c and the side of the membrane electrode facing the cathode plate 11c. The airflow field array 22c is disposed in the airflow field cavity 21c and is used to block and divert the air flowing through the airflow field cavity 21c. The airflow field lattice 22c includes multiple rows of first V-shaped protrusions 221c. These multiple rows of first V-shaped protrusions 221c are arranged sequentially from the first end to the second end of the bipolar plate body 1c within the airflow field cavity 21c. The openings of the first V-shaped protrusions 221c face the second end of the bipolar plate body 1c. Specifically, the first V-shaped protrusions 221c are formed by protruding outwards from the bottom wall of the airflow field groove 112c. Multiple rows of first V-shaped protrusions 221c are arranged sequentially from the first end to the second end of the cathode plate 11c within the airflow field cavity 21c. Within the groove 112c, the opening of the first V-shaped protrusion 221c faces the second end of the cathode plate 11c. In every two adjacent rows of the first V-shaped protrusions 221c, the first V-shaped protrusion 221c in one row is directly opposite the interval between two adjacent first V-shaped protrusions 221c in the other row. The opening width of the first V-shaped protrusion 221c in one row is not less than the interval between two adjacent first V-shaped protrusions 221c in the other row. Air flowing through the gap between two adjacent first V-shaped convex hulls 221c in a row of first V-shaped convex hulls 221c is blocked and diverted by the first V-shaped convex hulls 221c in another row of first V-shaped convex hulls 221c adjacent to the first row of first V-shaped convex hulls 221c, which are directly opposite the gap. As the air flows through the airflow field lattice 22c, it is continuously blocked and diverted, allowing the air to be more evenly distributed within the airflow field cavity 21c, thus improving the fuel cell stack performance. It is understood that in some embodiments, the airflow field 2c can also be the airflow field 2c structure described in Embodiment 1 or Embodiment 2 above.

[0084] like Figure 26 , Figure 27 , Figure 28 and Figure 29As shown, the cooling flow field 3c includes a cooling flow field cavity 31c and a cooling flow field lattice 32c. The cooling flow field cavity 31c is formed within the bipolar plate body 1c at a position corresponding to the reaction zone. Specifically, the cooling flow field cavity 31c is formed between the cathode plate 11c and the anode plate 12c at a position corresponding to the reaction zone. The cooling flow field cavity 31c is formed by the first cooling flow field groove 111c and the second cooling flow field groove 121c arranged opposite each other. The cooling flow field lattice 32c is disposed within the cooling flow field cavity 31c. 32c includes a plurality of support points 321c spaced apart within the cooling flow field cavity 31c and used to support the two cavity walls of the cooling flow field cavity 31c. Specifically, the support points 321c include a third protrusion 3211c protruding from the bottom wall of the first cooling flow field groove 111c toward the anode plate 12c and a fourth protrusion 3212c protruding from the bottom wall of the second cooling flow field groove 121c at a position corresponding to the third protrusion 3211c toward the cathode plate 11c. The fourth protrusion 3212c and the third protrusion 3211c abut against each other. It is understood that in some embodiments, the support point 321c may also be formed by protruding directly from the bottom wall of the second cooling flow field tank 121c toward the cathode plate 11c, with one end of the support point 321c facing the cathode plate 11c abutting against the cathode plate 11c. In other embodiments, the support point 321c may also be formed by protruding from the bottom wall of the first cooling flow field tank 111c toward the anode plate 12c, with one end of the support point 321c facing the anode plate 12c abutting against the anode plate 12c. Except for the portion occupied by each of the support points 321c, the remaining portion of the cooling flow field cavity 31c consists of cooling liquid channels for the flow of coolant. This allows the cooling liquid channels to cover a larger area of ​​the cooling flow field cavity 31c, resulting in better cooling of the bipolar plate by the cooling flow field 3c. The cooling flow field lattice 32c also supports the two cavity walls of the cooling flow field cavity 31c, preventing the bipolar plate body 1c from being concave or deformed at the position corresponding to the cooling flow field cavity 31c when the bipolar plate is press-fitted into a fuel cell stack.

[0085] like Figure 24 and Figure 25As shown, the hydrogen flow field 4c includes a hydrogen flow field cavity 41c and a hydrogen flow field array 42c. The hydrogen flow field cavity 41c is located between the second side of the bipolar plate body 1c and another membrane electrode (not shown in the figure) corresponding to the reaction zone position. Specifically, the hydrogen flow field cavity 41c is located between the outer side of the anode plate 12c and the other membrane electrode corresponding to the reaction zone position. The hydrogen flow field cavity 41c is formed by the hydrogen flow field groove 122c and the side of the other membrane electrode facing the anode plate 12c. The hydrogen flow field array 42c is disposed in the hydrogen flow field cavity 41c and is used to block and divert the hydrogen flowing through the hydrogen flow field cavity 41c. The hydrogen flow field lattice 42c includes multiple rows of second V-shaped protrusions 421c. These multiple rows of second V-shaped protrusions 421c are arranged sequentially from the first end to the second end of the bipolar plate body 1c within the hydrogen flow field cavity 41c. The openings of the second V-shaped protrusions 421c face the second end of the bipolar plate body 1c. Specifically, the second V-shaped protrusions 421c are formed by protruding outwards from the bottom wall of the hydrogen flow field groove 122c. Multiple rows of second V-shaped protrusions 421c are arranged sequentially from the first end to the second end of the anode plate 12c within the hydrogen flow field. Within the groove 122c, the opening of the second V-shaped protrusion 421c faces the second end of the anode plate 12c. In every two adjacent rows of the second V-shaped protrusion 421c, the second V-shaped protrusion 421c in one row is directly opposite the interval between two adjacent second V-shaped protrusions 421c in the other row. The opening width of the second V-shaped protrusion 421c in one row is not less than the interval between two adjacent second V-shaped protrusions 421c in the other row. After hydrogen flows through the gap between two adjacent second V-shaped convex 421cs in a row of second V-shaped convex 421cs, it will be blocked and diverted by the second V-shaped convex 421cs in another row of second V-shaped convex 421cs adjacent to the row of second V-shaped convex 421cs, which are directly opposite the gap. As the hydrogen flows through the hydrogen flow field lattice 42c, it will be continuously blocked and diverted, which can make the hydrogen more uniformly distributed in the air flow field cavity 21c, thereby improving the performance of the fuel cell stack.The second V-shaped protrusion 421c, by obstructing and diverting the hydrogen flow, reduces the hydrogen velocity, allowing for a more complete reaction and improving energy efficiency. In abnormal situations, such as a sudden failure of the hydrogen pump, the openings of each of the second V-shaped protrusions 421c block the backflow of gas from the hydrogen discharge channel, reducing the backflow velocity at the hydrogen discharge channel 10c. For a period after the sudden failure of the hydrogen pump, the hydrogen flow field 4c maintains a sufficient amount of reacting gas to continue the reaction, preventing instantaneous reverse polarity and allowing the user an opportunity for emergency handling, thus reducing the risk of the fuel cell stack burning out. It is understood that in some embodiments, the hydrogen flow field 4c can also be the structure described in Embodiment 1 or Embodiment 2 above.

[0086] like Figure 22 As shown, the air inlet channel 5c includes an air inlet 51c and a first connecting channel 52c. The air inlet 51c is located at the first end of the bipolar plate body 1c and penetrates perpendicularly through the bipolar plate body 1c. Specifically, the air inlet 51c is located at the first end of the cathode plate 11c and the anode plate 12c and penetrates perpendicularly through the cathode plate 11c and the anode plate 12c. The first connecting channel 52c is located inside the bipolar plate body 1c. Specifically, the first connecting channel 52c is located between the cathode plate 11c and the anode plate 12c. The first end of the first connecting channel 52c is connected to the air inlet 51c, and the second end of the first connecting channel 52c extends to the first side of the bipolar plate body 1c and is connected to the air flow field cavity 21c. Specifically, the second end of the first connecting channel 52c penetrates the cathode plate 11c and is connected to the air flow field cavity 21c. Air pumped to the air inlet 51c by the air pump can enter the air flow field cavity 21c through the first connecting channel 52c.

[0087] The coolant inlet channel 6c includes a coolant inlet 61c and a second connecting channel 62c. The coolant inlet 61c is located at the first end of the bipolar plate body 1c and penetrates perpendicularly through the bipolar plate body 1c. Specifically, the coolant inlet 61c is located at the first end of the cathode plate 11c and the anode plate 12c and penetrates perpendicularly through the cathode plate 11c and the anode plate 12c. The second connecting channel 62c is located inside the bipolar plate body 1c. Specifically, the second connecting channel 62c is located between the cathode plate 11c and the anode plate 12c. The first end of the second connecting channel 62c is connected to the coolant inlet 61c, and the second end of the second connecting channel 62c is connected to the cooling flow field cavity 31c. The coolant pumped to the coolant inlet 61c by the water pump can enter the cooling flow field cavity 31c through the second connecting channel 62c.

[0088] The hydrogen inlet channel 7c includes a hydrogen inlet 71c and a third connecting channel 72c. The hydrogen inlet 71c is located at the first end of the bipolar plate body 1c and penetrates the bipolar plate body 1c perpendicularly. Specifically, the hydrogen inlet 71c is located at the first end of the cathode plate 11c and the anode plate 12c and penetrates the cathode plate 11c and the anode plate 12c perpendicularly. The third connecting channel 72c is located inside the bipolar plate body 1c. Specifically, the third connecting channel 72c is located between the cathode plate 11c and the anode plate 12c. The first end of the third connecting channel 72c is connected to the hydrogen inlet 71c, and the second end of the third connecting channel 72c extends to the second side of the bipolar plate body 1c and is connected to the hydrogen flow field cavity 41c. Specifically, the second end of the third connecting channel 72c penetrates the anode plate 12c and is connected to the hydrogen flow field cavity 41c. Hydrogen pumped to the hydrogen inlet 71c by the hydrogen pump can enter the hydrogen flow field cavity 41c through the third connecting channel 72c.

[0089] like Figure 24 As shown, the air exhaust channel 8c includes an air outlet 81c and a fourth connecting channel 82c. The air outlet 81c is located at the second end of the bipolar plate body 1c and penetrates the bipolar plate body 1c perpendicularly. Specifically, the air outlet 81c is located at the second end of the cathode plate 11c and the anode plate 12c and penetrates the cathode plate 11c and the anode plate 12c perpendicularly. The fourth connecting channel 82c is located inside the bipolar plate body 1c. Specifically, the fourth connecting channel 82c is located between the cathode plate 11c and the anode plate 12c. The first end of the fourth connecting channel 82c is connected to the air outlet 81c, and the second end of the fourth connecting channel 82c extends to the first side of the bipolar plate body 1c and is connected to the air flow field cavity 21c. Specifically, the second end of the fourth connecting channel 82c penetrates the cathode plate 11c and is connected to the air flow field cavity 21c. The air, after reacting within the airflow cavity 21c, enters the air outlet 81c via the fourth connecting channel 82c and is then discharged from the air outlet 81c. The fourth connecting channel 82c, which connects to the airflow cavity 21c, and the first connecting channel 52c, which connects to the airflow cavity 21c, are located at opposite corners of the airflow cavity 21c. That is, the air inlet channel 5c and the air outlet channel 8c are located at opposite corners of the airflow cavity 21c. This structure increases the length of the airflow path within the airflow cavity 21c.

[0090] The coolant discharge channel 9c includes a coolant outlet 91c and a fifth connecting channel 92c. The coolant outlet 91c is located at the second end of the bipolar plate body 1c and penetrates perpendicularly through the bipolar plate body 1c. Specifically, the coolant outlet 91c is located at the second end of the cathode plate 11c and the anode plate 12c and penetrates perpendicularly through the cathode plate 11c and the anode plate 12c. The fifth connecting channel 92c is located inside the bipolar plate body 1c. Specifically, the fifth connecting channel 92c is located between the cathode plate 11c and the anode plate 12c. The first end of the fifth connecting channel 92c is connected to the coolant outlet 91c, and the second end of the fifth connecting channel 92c is connected to the cooling flow field cavity 31c. The coolant flowing through the cooling flow field cavity 31c can enter the coolant outlet 91c through the fifth connecting channel 92c and then be discharged from the coolant outlet 91c.

[0091] The hydrogen exhaust channel 10c includes a hydrogen outlet 101c and a sixth connecting channel 102c. The hydrogen outlet 101c is located at the second end of the bipolar plate body 1c and penetrates the bipolar plate body 1c perpendicularly. Specifically, the hydrogen outlet 101c is located at the second end of the cathode plate 11c and the anode plate 12c and penetrates the cathode plate 11c and the anode plate 12c perpendicularly. The sixth connecting channel 102c is located inside the bipolar plate body 1c. Specifically, the sixth connecting channel 102c is located between the cathode plate 11c and the anode plate 12c. The first end of the sixth connecting channel 102c is connected to the hydrogen outlet 101c, and the second end of the sixth connecting channel 102c extends to the second side of the bipolar plate body 1c and is connected to the hydrogen flow field cavity 41c. Specifically, the second end of the sixth connecting channel 102c penetrates the anode plate 12c and is connected to the hydrogen flow field cavity 41c. The remaining hydrogen gas after reaction in the hydrogen gas flow field cavity 41c can enter the hydrogen outlet 101c through the sixth connecting channel 102c and then exit through the hydrogen outlet 101c. The positions of the third connecting channel 72c connecting to the hydrogen gas flow field cavity 41c and the sixth connecting channel 102c connecting to the hydrogen gas flow field cavity 41c are respectively located at two opposite corners of the hydrogen gas flow field cavity 41c, that is, the hydrogen inlet channel 7c and the hydrogen outlet channel 10c are respectively located at two opposite corners of the hydrogen gas flow field 4c. With this structure, the length of the flow path of hydrogen gas in the hydrogen gas flow field 4c can be increased, the hydrogen reaction can be more complete, hydrogen waste can be reduced, and energy utilization efficiency can be improved.

[0092] The above embodiments merely illustrate preferred implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention should be determined by the appended claims.

Claims

1. A bipolar plate, characterized in that: The system includes a bipolar plate body, an air flow field formed on a first side of the bipolar plate body corresponding to the reaction zone, a cooling flow field formed within the bipolar plate body corresponding to the reaction zone, a hydrogen flow field formed on a second side of the bipolar plate body opposite to the first side, corresponding to the reaction zone, an air inlet channel, a coolant inlet channel, and a hydrogen inlet channel located at a first end of the bipolar plate body and respectively connected to the air flow field, the cooling flow field, and the hydrogen flow field, and an air outlet channel, a coolant outlet channel, and a hydrogen outlet channel located at a second end of the bipolar plate body and respectively connected to the air flow field, the cooling flow field, and the hydrogen flow field; the cooling flow field includes a cooling flow field cavity formed within the bipolar plate body corresponding to the reaction zone and a cooling flow field lattice located within the cooling flow field cavity, the cooling flow field lattice including a plurality of support points spaced apart within the cooling flow field cavity and used to support the two cavity walls of the cooling flow field cavity, the support points protruding from the cavity wall of the cooling flow field cavity into the cavity; The airflow field includes an airflow field cavity located between the first side of the bipolar plate body and a membrane electrode and corresponding to the position of the reaction zone, and an airflow field lattice disposed in the airflow field cavity. The airflow field lattice includes a plurality of first lattice groups arranged longitudinally and laterally in the airflow field cavity, and each first lattice group includes a plurality of first protrusions arranged in a hexagonal pattern. The first protrusion is formed by protruding from the cavity wall of the airflow cavity into the cavity.

2. A bipolar plate as described in claim 1, characterized in that: The hydrogen flow field includes a hydrogen flow field cavity located between the second side of the bipolar plate body and another membrane electrode and corresponding to the position of the reaction zone, and a hydrogen flow field lattice disposed in the hydrogen flow field cavity. The hydrogen flow field lattice includes a plurality of second lattice groups arranged longitudinally and laterally in the hydrogen flow field cavity, and each second lattice group includes a plurality of second protrusions arranged in a hexagonal pattern.

3. A bipolar plate as described in claim 1, characterized in that: The air inlet channel and the air outlet channel are located at opposite corners of the air flow field, and the hydrogen inlet channel and the hydrogen outlet channel are located at opposite corners of the hydrogen flow field.

4. A bipolar plate, characterized in that: The system includes a bipolar plate body, an air flow field formed on a first side of the bipolar plate body corresponding to the reaction zone, a cooling flow field formed within the bipolar plate body corresponding to the reaction zone, a hydrogen flow field formed on a second side of the bipolar plate body opposite to the first side, corresponding to the reaction zone, an air inlet channel, a coolant inlet channel, and a hydrogen inlet channel located at a first end of the bipolar plate body and respectively connected to the air flow field, the cooling flow field, and the hydrogen flow field, and an air outlet channel, a coolant outlet channel, and a hydrogen outlet channel located at a second end of the bipolar plate body and respectively connected to the air flow field, the cooling flow field, and the hydrogen flow field; the cooling flow field includes a cooling flow field cavity formed within the bipolar plate body corresponding to the reaction zone and a cooling flow field lattice located within the cooling flow field cavity, the cooling flow field lattice including a plurality of support points spaced apart within the cooling flow field cavity and used to support the two cavity walls of the cooling flow field cavity, the support points protruding from the cavity wall of the cooling flow field cavity into the cavity; The airflow field includes an airflow field cavity located between the first side of the bipolar plate body and a membrane electrode and corresponding to the position of the reaction zone, and an airflow field lattice disposed in the airflow field cavity for blocking and diverting the air flowing through the airflow field cavity. The airflow field dot matrix includes multiple rows of first strip-shaped protrusions arranged sequentially from the first end to the second end of the bipolar plate body within the airflow field cavity. Each first strip-shaped protrusion is inclined relative to its arrangement direction. The first strip-shaped protrusions in each two adjacent rows of first strip-shaped protrusions are inclined in opposite directions. In each two adjacent rows of first strip-shaped protrusions, the first strip-shaped protrusions in one row are directly opposite the interval between two adjacent first strip-shaped protrusions in the other row. The first strip-shaped protrusions are formed by protruding from the cavity wall of the airflow field cavity into the cavity.

5. A bipolar plate as described in claim 4, characterized in that: The hydrogen flow field includes a hydrogen flow field cavity located between the second side of the bipolar plate body and another membrane electrode, corresponding to the position of the reaction zone, and a hydrogen flow field array disposed within the hydrogen flow field cavity for blocking and diverting the hydrogen flowing through the hydrogen flow field cavity.

6. A bipolar plate as described in claim 5, characterized in that: The hydrogen flow field array includes multiple rows of second strip-shaped protrusions arranged sequentially from the first end to the second end of the bipolar plate body within the hydrogen flow field cavity. Each second strip-shaped protrusion is inclined relative to its arrangement direction. The second strip-shaped protrusions in each two adjacent rows of second strip-shaped protrusions are inclined in opposite directions. In each two adjacent rows of second strip-shaped protrusions, the second strip-shaped protrusions in one row are directly opposite the interval between two adjacent second strip-shaped protrusions in the other row.

7. A bipolar plate as described in claim 4, characterized in that: The air inlet channel and the air outlet channel are located at opposite corners of the air flow field, and the hydrogen inlet channel and the hydrogen outlet channel are located at opposite corners of the hydrogen flow field.

8. A bipolar plate, characterized in that: The system includes a bipolar plate body, an air flow field formed on a first side of the bipolar plate body corresponding to the reaction zone, a cooling flow field formed within the bipolar plate body corresponding to the reaction zone, a hydrogen flow field formed on a second side of the bipolar plate body opposite to the first side, corresponding to the reaction zone, an air inlet channel, a coolant inlet channel, and a hydrogen inlet channel located at a first end of the bipolar plate body and respectively connected to the air flow field, the cooling flow field, and the hydrogen flow field, and an air outlet channel, a coolant outlet channel, and a hydrogen outlet channel located at a second end of the bipolar plate body and respectively connected to the air flow field, the cooling flow field, and the hydrogen flow field; the cooling flow field includes a cooling flow field cavity formed within the bipolar plate body corresponding to the reaction zone and a cooling flow field lattice located within the cooling flow field cavity, the cooling flow field lattice including a plurality of support points spaced apart within the cooling flow field cavity and used to support the two cavity walls of the cooling flow field cavity, the support points protruding from the cavity wall of the cooling flow field cavity into the cavity; The airflow field includes an airflow field cavity located between the first side of the bipolar plate body and a membrane electrode and corresponding to the position of the reaction zone, and an airflow field lattice disposed in the airflow field cavity for blocking and diverting the air flowing through the airflow field cavity. The airflow field lattice includes multiple rows of first V-shaped protrusions with openings facing the second end, arranged sequentially from the first end to the second end of the bipolar plate body within the airflow field cavity. In each pair of adjacent rows of the first V-shaped protrusions, the first V-shaped protrusion in one row is directly opposite the interval between two adjacent first V-shaped protrusions in the other row. The opening width of the first V-shaped protrusion in one row is not less than the interval between two adjacent first V-shaped protrusions in the other row. The first V-shaped protrusions are formed by protruding from the cavity wall of the airflow field cavity into the cavity.

9. A bipolar plate as described in claim 8, characterized in that: The hydrogen flow field includes a hydrogen flow field cavity located between the second side of the bipolar plate body and another membrane electrode and corresponding to the position of the reaction zone, and a hydrogen flow field array disposed in the hydrogen flow field cavity for blocking and diverting the hydrogen flowing through the hydrogen flow field cavity. The hydrogen flow field lattice includes multiple rows of second V-shaped protrusions with openings facing the second end, arranged sequentially from the first end to the second end of the bipolar plate body within the hydrogen flow field cavity. In each pair of adjacent rows of second V-shaped protrusions, the second V-shaped protrusion in one row is directly opposite the interval between two adjacent second V-shaped protrusions in the other row. The opening width of the second V-shaped protrusion in one row is not less than the interval between two adjacent second V-shaped protrusions in the other row.

10. A bipolar plate as described in claim 8, characterized in that: The air inlet channel and the air outlet channel are located at opposite corners of the air flow field, and the hydrogen inlet channel and the hydrogen outlet channel are located at opposite corners of the hydrogen flow field.

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