CN113381038B - Metal bipolar plate with Z-shaped flow field area distribution - Google Patents
Metal bipolar plate with Z-shaped flow field area distribution Download PDFInfo
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- CN113381038B CN113381038B CN202110587597.4A CN202110587597A CN113381038B CN 113381038 B CN113381038 B CN 113381038B CN 202110587597 A CN202110587597 A CN 202110587597A CN 113381038 B CN113381038 B CN 113381038B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
- H01M8/0263—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant having meandering or serpentine paths
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
- H01M8/026—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant characterised by grooves, e.g. their pitch or depth
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
- H01M8/0265—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant the reactant or coolant channels having varying cross sections
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Abstract
The invention discloses a metal bipolar plate with Z-shaped flow field area distribution. The gas flow field plate comprises a plate body of the polar plate, wherein the front surface of the plate body of the polar plate is configured into a gas flow field; the back surface of the plate body is configured as a cooling medium flow field; the two ends of the polar plate body are respectively provided with a cooling medium inlet and a cooling medium outlet, and a gas channel is arranged on the polar plate body between the cooling medium inlets and the cooling medium outlets. The gas flow field comprises a right-angled triangle of a first area which is an inlet area; the right triangle of the third area is the exit area and the parallelogram is the active area. According to the technical scheme, the distribution of the inlet and outlet positions of air, hydrogen and cooling liquid can greatly improve the distribution uniformity of fluid entering each flow channel of the active area, so that the performance of the battery is improved. The arrangement of snake-shaped flow channel in the scheme can strengthen the drainage effect of the flow channel.
Description
Technical Field
The invention belongs to the technology of hydrogen energy, and particularly relates to a hydrogen energy battery structure, in particular to a current collecting plate, namely a bipolar plate technology in the hydrogen energy battery structure.
Background
The bipolar plate is also called as collector plate, and is one of the important parts affecting the performance of proton exchange membrane fuel cell, and has the main functions of forming fluid channel, isolating hydrogen and air flow field and forming circuit between the anode and cathode. The bipolar plate is usually made of graphite, composite materials or metal materials, wherein the metal bipolar plate has the advantages of easy processing, strong conductivity, good mechanical property, low cost, high strength, thin thickness, small volume, high volumetric specific power and specific energy of the battery and the like.
The flow field structure on the bipolar plate determines the flowing state of reactants and products in the flow field, the drainage and heat dissipation capacity of the battery and the stability of long-term operation, so that the designed flow field structure can greatly improve the operation performance of the battery. The proton exchange membrane fuel cell generally adopts a three-in three-out arrangement, and three flow fields of hydrogen, air and cooling liquid are respectively provided with an inlet and an outlet. The core area where the electrochemical reaction of hydrogen and air occurs is called the active area, and the flow field form of the active area is usually mainly a straight flow field, a serpentine flow field, a wave-shaped flow field and a 3D flow field, and the flow fields have their own advantages and disadvantages.
Patent CN201711284139.3 discloses a bipolar plate with a novel flow field structure, which is characterized in that a main flow field area of a gas flow field is composed of strip-shaped plates arranged at intervals, the strip-shaped plates are sequentially composed of an inclined structure and a platform structure along an airflow direction, and the three-dimensional flow field structure with the inclined plane increases diffusion of gas in a battery to MEA by utilizing the inclined plane, promotes mass transfer, is beneficial to discharge of produced water in the MEA, increases performance of the battery under high current density, can be directly machined on a graphite plate, is relatively low in cost, greatly enhances machinability, and can increase performance of the battery without increasing cost of the battery. The strip-shaped plate structure with discontinuous main flow field area in the technology is similar to a grid-type flow field, and inevitably causes the contact area between the cathode plate and the anode plate and the MEA to be greatly reduced, so that the contact resistance is increased, and the power generation effect and performance of the battery are influenced. And the flow of the fluid in the inlet and outlet connecting line area is fast, and there may be stagnant flow in the corner, which is easy to cause concentration polarization or flooding.
Cn202010052276.X discloses a graphite-metal composite bipolar plate for an ultra-high power proton exchange membrane fuel cell, wherein an anode reactant inlet and an anode reactant outlet and a cathode reactant inlet and an outlet are arranged around the bipolar plate, a reaction flow field is arranged in the center of the bipolar plate and comprises a flow field unit formed by concave-convex grooves and a point-shaped groove distribution flow channel formed by a boss and a convex groove, and fluid flows more uniformly in the bipolar plate and the heat dissipation of the fluid is more uniform. The active region main flow field is formed by combining a dot-matrix groove convex flow field, a snake-shaped flow field and a parallel flow field, the structure is too complex, the difficulty of processing and production is high, and high design requirements are required for structurally matching the male unipolar plate and the female unipolar plate. In addition, the complex flow field design of the present invention can greatly increase the loss of fluid flow.
The cooling medium inlet and outlet of the bipolar plate are arranged on the same side as the hydrogen inlet and outlet or the air inlet and outlet, and the cooling medium inlet and outlet and the hydrogen inlet and outlet or the air inlet and outlet need to be considered, so that the structure of the cooling medium inlet section is complex, and the loss of fluid flow is increased. Including cooling medium, hydrogen, air flow losses.
Disclosure of Invention
The invention aims to provide a metal bipolar plate with distributed Z-shaped flow field areas, which has small flow path loss of cooling medium, hydrogen and air.
The technical scheme of the invention comprises the following steps: the gas flow field plate comprises a plate body of the polar plate, wherein the front surface of the plate body of the polar plate is configured into a gas flow field; the back surface of the plate body is configured as a cooling medium flow field; the two ends of the polar plate body are respectively provided with a cooling medium inlet and a cooling medium outlet, a gas channel port is arranged on the polar plate body between the cooling medium inlets and the outlets, and the gas channel port comprises a first gas channel port and a second gas channel port which are respectively arranged at the two sides of the polar plate body near the cooling medium inlets; a first gas second passage and a second gas second passage are respectively arranged on two sides of the polar plate body at the far end of the cooling medium inlet;
the cooling medium flow field includes:
a first vertical groove portion arranged at the outermost layer of the polar plate cooling medium inlet and vertical to the flowing direction of the cooling medium, and a first parallel groove portion communicated with one end of the first vertical groove portion, wherein the first parallel groove portion is parallel to the flowing direction of the cooling medium, or vertical to the flowing direction of the first gas channel opening, or vertical to the flowing direction of the second gas channel opening; the length of the first vertical groove part is not less than the length of the cooling medium inlet of the cathode plate;
a second vertical groove part which is arranged at the outermost layer of the cooling medium outlet of the pole plate and is vertical to the outflow direction of the cooling medium, and a second parallel groove part which is communicated with one end of the second vertical groove part, wherein the second parallel groove part is parallel to the inflow direction of the cooling medium, or is vertical to the inflow direction of the first gas second channel opening, or is vertical to the outflow direction of the second gas second channel opening; the length of the second vertical groove part is not less than the length of the cathode plate cooling medium outlet;
the first parallel groove part and the second parallel groove part are positioned on the outermost layers at two sides of the cooling medium flow field.
The bipolar plate enables the medium at the cooling medium inlet on the plate body (the cathode plate and the anode plate) to enter the flow direction and the medium at the cooling medium outlet to flow out, and the medium flow direction is not parallel to the air inlet flow direction and the air flow direction at the air outlet on the plate body (the cathode plate and the anode plate); in particular, the media inlet flow direction at the cooling medium inlet and the media outlet flow direction at the cooling medium outlet on the plate body (cathode plate and anode plate) are perpendicular to the gas inlet flow direction at the gas inlet and the gas outlet flow direction at the gas outlet on the plate body (cathode plate and anode plate); in the structural arrangement, if the bipolar plate is rectangular or square, the cooling medium inlet and the cooling medium outlet are arranged on two opposite sides of the bipolar plate, and the hydrogen inlet and the hydrogen outlet are arranged on the other opposite sides. Under the condition of a certain area of the bipolar plate, the area of the inlet and the outlet of the cooling medium can be greatly increased, and the entering amount of the cooling medium in a cold area is increased;
the positive gas flow field of polar plate body includes:
the first region is near the cooling medium inlet of the pole plate, the second region is near the cooling medium outlet of the pole plate, and the third region is near the cooling medium outlet of the pole plate; the gas flow field of the first area comprises a plurality of parallel first group of flow channels, the first group of flow channels are parallel to the first vertical groove parts, and the first vertical groove parts (ridges) are the outermost layers of the first group of flow channels; the first group of flow channels are communicated with the first gas channel opening, the gas flow field of the third area comprises a plurality of parallel third group of flow channels, the third group of flow channels are parallel to the second vertical groove parts, and the second vertical groove parts (ridges) are the outermost layers of the third group of flow channels; the third group of flow channels are communicated with the second channel opening of the first gas, the gas flow field of the second area comprises a plurality of parallel second group of flow channels, and the second group of flow channels are parallel to the first parallel groove parts; the first parallel groove part (ridge) and the second parallel groove part (ridge) are the outmost layers of the second group of flow channels, at least every two flow channels in the second group of flow channels are communicated with one flow channel in the first group of flow channels, and at least every two flow channels in the second group of flow channels are communicated with one flow channel in the third group of flow channels.
Specifically, the first parallel groove portion is parallel to the inlet flow direction of the cooling medium, and is vertical to the inlet flow direction of the first gas inlet, vertical to the outlet flow direction of the first gas outlet, vertical to the inlet flow direction of the second gas inlet, and vertical to the outlet flow direction of the second gas outlet.
The vertical part in the flow channel structure of the outermost layer of the cooling medium can effectively reduce the flow velocity of the medium after the cooling medium enters, improve the heat exchange efficiency and reduce the pressure loss of a cooling liquid flow field; the parallel part can rapidly introduce a cooling medium into the passage openings of the hydrogen and the air, particularly the outlet part, so that the region has larger temperature difference, and the cold zone effect at the tail end of the reaction is improved.
Further preferred technical solution includes: the polar plate body comprises a negative plate and a positive plate; the first gas is air, and the second gas is hydrogen; the import of hydrogen, the import of air all dispose in the same one side of negative plate and anode plate, the export of hydrogen, the export of air all disposes in the opposite side of negative plate and anode plate, the import of hydrogen, the import of air, the export of hydrogen, the export cross symmetry setting of air.
The hydrogen flow field structure shape on the front surface of the anode plate and the air flow field structure shape on the front surface of the cathode plate are mutually the same in 180-degree turnover conversion of the horizontal axis.
The total length of each flow channel in the gas flow field is the same.
The polar plate cooling medium flow field comprises a cathode plate cooling medium flow field arranged on the back of the cathode plate and an anode plate cooling medium flow field arranged on the back of the anode plate.
The arrangement of the inlet and the outlet of the flow field is beneficial to the arrangement of relevant pipelines on the vehicle, and is more beneficial to the arrangement, simplification and arrangement of the flow field on the polar plate. A reduced amount of plate material in the limited area can be achieved.
The further technical characteristics are as follows: the polar plate body comprises two first parallel groove parts which are respectively arranged at two sides of the polar plate body; starting from the coolant inlet and outlet seals, respectively, extends over one gas passage opening in the plate body and terminates in the other gas passage opening. One gas passage port comprises a first gas passage port and a second gas passage port; the other gas passage port comprises a first gas second passage port and a second gas second passage port.
The further technical characteristics are as follows: an air inlet of a cathode plate in the plate body of the pole plate is arranged at the near end of the cooling medium inlet, and a hydrogen inlet arranged at the same side is arranged at the far end of the cooling medium inlet; the air outlet on the other side of the cathode plate is arranged at the far end of the cooling medium inlet, and the hydrogen outlet on the other side of the cathode plate is arranged at the near end of the cooling medium inlet; the first parallel groove part on the back of the cathode plate is positioned at the near end of the hydrogen outlet, starts from the sealing position of the end part of the hydrogen outlet, extends over the hydrogen outlet and ends at the internal sealing position of the air outlet; a second parallel groove portion on the back side of the cathode plate is located proximate the hydrogen inlet, starting at a hydrogen inlet end seal location, extending across the hydrogen inlet and ending at an air inlet internal seal location.
The further technical characteristics are as follows: an air inlet of an anode plate in the plate body is arranged at the near end of a cooling medium inlet, and a hydrogen inlet arranged at the same side is arranged at the far end of the cooling medium inlet; the air outlet on the other side of the anode plate is arranged at the far end of the cooling medium inlet, and the hydrogen outlet on the other side of the anode plate is arranged at the near end of the cooling medium inlet; the first parallel groove part on the back of the anode plate is positioned at the near end of the air inlet, extends from the air inlet end sealing position to the air outlet and stops at the hydrogen inlet end sealing position; a second parallel groove portion is formed in the back surface of the anode plate and is located at the proximal end of the air outlet, and starts from the air outlet end sealing position, extends over the air outlet and ends at the hydrogen outlet inner sealing position.
The sealing positions refer to corresponding positions on the extension lines of the sealing lines at the two ends of the gas channel opening.
The Z-shaped flow field is formed, the entering amount of the cooling medium is large, the high-temperature heat exchange between the entering low-temperature cooling medium and the gas reaction end is realized, the cooling effect is improved, and meanwhile, the on-way flow resistance of the gas is small.
The first area of the air flow field on the front surface of the cathode plate comprises a plurality of parallel first groups of flow channels parallel to the air inflow direction; the third area comprises a plurality of third groups of flow channels which are parallel to the air outflow direction, and the first group of flow channels and the third group of flow channels are communicated through the second group of flow channels, so that the on-way resistance of air entering the flow field is reduced; the second group of flow channels are parallel to the cooling medium flow channels, and are parallel to the first parallel groove parts and the second parallel groove parts.
The first area of the hydrogen flow field on the front surface of the anode plate comprises a plurality of first groups of flow channels which are parallel to the hydrogen inflow direction; the third area comprises a plurality of third groups of flow channels which are parallel to the hydrogen outflow direction, the first group of flow channels and the third group of flow channels are communicated through the second group of flow channels, and the flow channels reduce the on-way resistance of hydrogen entering the flow field; the second group of flow channels are parallel to the cooling medium flow channels, and are parallel to the first parallel groove parts and the second parallel groove parts.
Further optimization technical features include: the second area in the air flow field is a parallelogram surrounded by the second group of flow channels, and the first area in the air flow field is a right-angled triangle surrounded by the first group of flow channels and taking the hypotenuse of the parallelogram as the hypotenuse; the third area in the air flow field is a right triangle which is enclosed by the third group of flow channels and takes the hypotenuse of the parallelogram as the hypotenuse.
The right triangle of the first area in the air flow field is an inlet area, namely a first active area; the right triangle of the third area in the air flow field is the outlet area, i.e. the third active area, and the parallelogram is the active area, i.e. the second active area.
The arrangement structure of the flow field enables the flow field to be regular, and is beneficial to reducing the on-way resistance; the die is convenient to set and process.
Further optimization technical features include: the total length of each flow channel in the air flow field is the same.
Further optimization technical features include: the ridge width in the first group of flow channels in the gas flow field is the same as the ridge width in the third group of hydrogen flow channels, and both the ridge width and the ridge width are larger than the ridge width in the second group of hydrogen flow channels.
Further optimization technical features include: the second area in the hydrogen flow field is a parallelogram surrounded by the second group of flow channels, and the first area in the hydrogen flow field is a right-angled triangle surrounded by the fourth group of flow channels and taking the hypotenuse of the parallelogram as the hypotenuse; the third area in the hydrogen flow field is a right-angled triangle which is enclosed by the third group of flow channels and takes the hypotenuse of the parallelogram as the hypotenuse.
The right triangle of the first area in the hydrogen flow field is an inlet area, namely a fourth active area; the right triangle of the third region in the hydrogen flow field is the outlet region, i.e., the sixth active region, and the parallelogram is the active region, i.e., the fifth active region.
Further optimization technical features include: the total length of each flow channel in the hydrogen flow field is the same.
Further optimization technical features include: a first group of multiple communication grooves are formed between the first vertical groove portion of the outermost layer at the inlet in the cooling medium flow field on the back of the cathode plate and/or the anode plate and the third vertical groove portion adjacent to the first vertical groove portion, and a second group of multiple communication grooves are formed between the second vertical groove portion of the outermost layer at the outlet in the cooling medium flow field on the back of the cathode plate and the fourth vertical groove portion adjacent to the second vertical groove portion.
A plurality of communication grooves are formed between the first vertical groove part at the outermost layer of the cooling medium flow field inlet and the adjacent vertical groove part at the outlet, so that the cooling medium can enter the flow field conveniently, and the cooling effect of the flow field is improved.
Of course, the vertical groove portion adjacent to the first vertical groove portion is a protrusion relative to the front surface of the pole plate, namely a ridge; the structure between the first vertical groove part and the adjacent vertical groove part is convex relative to the back surface of the polar plate, and is relative to the groove on the front surface of the polar plate, namely a gas flow channel. A plurality of communication grooves are formed in the protruding part on the back of the pole plate, and the depth of each communication groove cannot be larger than or equal to the height of the protruding part; that is, the depth of the plurality of communication grooves cannot be more than or equal to the depth of the gas flow channel of the polar plate.
Optionally, a raised structure is arranged in the first flow channel of the active area and the third flow channel of the active area in the air flow field of the cathode plate discontinuously or continuously, the height of the raised structure is far smaller than that of the ridge, and the back of the raised structure can allow the cooling liquid to circulate on the premise of not influencing the normal circulation of air; and optionally, a raised structure is arranged in the first flow channel of the active area and the third flow channel of the active area in the hydrogen flow field of the anode plate discontinuously or continuously, the height of the raised structure is far less than that of the ridge, and the back of the raised structure can allow the cooling liquid to flow without influencing the normal flow of the hydrogen. The number, height and position of the protruding structures are not limited and can be adjusted according to specific conditions.
According to the technical scheme, the arrangement of the inlet and outlet positions of the air, the hydrogen and the cooling liquid can greatly improve the distribution uniformity of the fluid when the fluid enters each flow channel of the active area, so that the performance of the battery is improved.
The arrangement of the Z-shaped flow channel in the scheme can strengthen the drainage effect of the flow channel.
The design of the active region of the invention that two pairs of flow channels are divided into two and then combined into one reduces the width requirement of the flow channels, and the flow channels and the ridges with different widths can be adopted for the three active regions according to the requirement of design performance.
In the scheme, the setting of a distribution area (also called as a transition area) in a general bipolar plate flow field structure is completely cancelled, so that more area can be distributed to the active area by greatly saving space, and the flow loss can be reduced by reducing the flow thread of fluid.
In addition, the flow field is simple in structure, a complex mold does not need to be designed, and processing and production are facilitated.
The structure of the cathode plate and the anode plate can be completely the same, so that only one mold is needed to be designed, and the cost can be greatly saved.
Drawings
FIG. 1 is a schematic front view of the cathode plate in the embodiment;
fig. 2 is a schematic front view of an anode plate in the embodiment;
FIG. 3 is a schematic view of the back side coolant flow channels of the cathode plate in the embodiment;
FIG. 4 is a schematic view of the back side coolant flow channel structure of the anode plate in the embodiment;
FIG. 5 is a schematic view of the structure of the coolant flow channel after assembly of the anode plate and the cathode plate;
FIG. 6 isbase:Sub>A schematic sectional view of FIG. 5A-A
Fig. 7 is a schematic view of a structure of a cooling liquid flow channel with an additional discontinuous boss structure in the embodiment.
FIG. 1-cathode plate; 101-cathode air inlet; 103-cathode air outlet; 104-cathode hydrogen inlet; 105-cathode hydrogen outlet; 106-cathode cooling water inlet; 107-cathode cooling water outlet; 108-a cathode plate first active area; 109-a cathode plate second active area; 110-a third active area of the cathode plate; 111-cathode plate seal position; 112-cathode plate cooling liquid flow channel; 2-an anode plate; 201-anode hydrogen inlet; 203-anode hydrogen outlet; 204-anode air inlet; 205-anode air outlet; 206-anode cooling water inlet; 207-anode cooling water outlet; 208-anode plate third active region; 209 — anode plate second active region; 210 — an anode plate first active region; 211-anode plate seal position; 212-anode plate coolant flow channel.
Detailed Description
The following detailed description is provided to explain the claims of the present invention so that those skilled in the art may understand the claims. The scope of the invention is not limited to the following specific implementation configurations. It is within the scope of the present invention that the present invention is different from the following detailed description, which includes the technical solutions of the claims, and the following embodiments "up", "down", "left", "right", and the like in the following embodiments are only used to indicate the relative position relationship in the drawings, and when the absolute position of the described object is changed, the relative position relationship may be changed accordingly. The left and right sides in the figure are ends and the top and bottom sides are sides.
The metallic bipolar plate for the "Z" type flow field area distribution of the present invention comprises a cathode plate 1 and an anode plate 2, as shown in fig. 1, 2. The front surface of the cathode plate 1 is an air flow field, and the front surface of the anode plate 2 is a hydrogen flow field. In the embodiment, the two plate bodies are rectangular. In order to lighten the plate body, four corners of a rectangle are removed in the embodiment.
As shown in fig. 1, a cooling medium inlet 106 and a cooling medium outlet 107 are respectively formed at two ends of a plate body of a cathode plate 1, the cooling medium inlet 106 and the cooling medium outlet 107 are arranged along the width direction of a rectangle, and a first gas first channel port and a second gas first channel port are formed at the lower side of the plate body between the cooling medium inlet 106 and the cooling medium outlet 107 at intervals; in an embodiment, the first gas first port is configured as a cathode air inlet 101 and the second gas first port is configured as a cathode hydrogen inlet 104; the upper side of the plate body between the cooling medium inlet 106 and the cooling medium outlet 107 is provided with a first gas second passage opening at intervals, and a second gas second passage opening; in an embodiment, the first gas second passage is configured as a cathode air outlet 103 and the second gas second passage is configured as a cathode hydrogen outlet 105. Wherein the cathode air inlet 101 and the cathode hydrogen outlet 105 are arranged near the cooling medium inlet 106, i.e. near the cooling medium inlet 106. The cathode air outlet 103 and the cathode hydrogen inlet 104 are disposed at a position far from the cooling medium inlet 106, i.e., at the distal end of the cooling medium inlet 106 (i.e., at the proximal end of the cooling medium outlet 107). In the embodiment, a cathode hydrogen inlet 104, a cathode hydrogen outlet 105 and a cathode air outlet 103 are symmetrically arranged on the center of the plate body in a crossed mode, and the cathode air inlet 101 is symmetrically arranged on the center of the plate body in a crossed mode. The openings may be, but are not limited to, the same shape and size. The openings of the cooling medium inlet 106 and the cooling medium outlet 107 are the same in shape and size.
The cathode hydrogen inlet 104, the cathode hydrogen outlet 105 and the cathode air outlet 103 are arranged along the length direction of the rectangle to make the most of the size of the length setting opening. The cooling medium inlet 106 and outlet 107 are provided in the width direction so as to make full use of the width dimension, and the flow area for the cooling medium to enter and exit is set as large as possible, which contributes to an increase in the amount of the cooling medium to enter.
The dark borders in fig. 1 along the edge of the cathode plate 1 are the sealing locations 111 of the cathode hydrogen inlet 104, the cathode hydrogen outlet 105 and the cathode air outlet 103, the cooling medium inlet 106 and the cooling medium outlet 107 on the front side of the cathode plate 1, which may be provided as sealing slots or directly coated with a sealant.
Wherein the sealing position around the cooling medium inlet 106 is an open frame, and the opening is the flowing direction of the cooling medium, which is shown by the arrow in the figure. The sealing position of the open frame upper side extends through the cathode hydrogen outlet 105 and ends at the inner end of the cathode air outlet 103. The sealing of the open frame underside is located at the outer end of the cathode air inlet 101.
The sealing position around the cooling medium outlet 107 is an open frame, and the opening is the outflow direction of the cooling medium, as indicated by the arrow in the figure. The seal on the upper side of the open frame is located at the outer end of the cathode air outlet 103 and the seal on the lower side of the open frame extends past the cathode hydrogen inlet 104 and terminates at the inner end of the cathode air inlet 101.
The seal around the cathode air inlet 101 is an open frame where the air flow is in the direction shown by the arrows. The sealing positions at the two ends of the frame with the opening are respectively overlapped with the sealing position at the lower side of the frame with the opening of the cooling medium inlet 106 and the extending sealing position at the lower side of the frame with the opening of the cooling medium outlet 107.
The sealing position around the cathode air outlet 103 is an open frame, and the opening is the air outflow direction, as indicated by the arrow in the figure. The sealing positions at the two ends of the frame with the opening are respectively lapped with the extending sealing position at the upper side of the frame with the opening of the cooling medium inlet 106 and the sealing position at the upper side of the frame with the opening of the cooling medium outlet 107.
The sealing positions around the cathode hydrogen inlet 104 and the cathode hydrogen outlet 105 are all closed frames.
The front surface of the cathode plate 1 is provided with an air flow field; including a first region 108 of the air flow field proximal to the cooling medium inlet (i.e., the first active area of the cathode plate), a second region 109 of the air flow field (i.e., the second active area of the cathode plate), and a third region 110 of the air flow field proximal to the cooling medium outlet (i.e., the third active area of the cathode plate).
The first region 108 of the air flow field includes a plurality of parallel air first set of flow channels, as indicated by the arrows.
The second region 109 of the air flow field comprises a second plurality of parallel air flow channels, as indicated by the arrows; the second set of air flow channels are arranged along the width direction of the cathode plate 1, and the width of the width direction is fully utilized. The air second set of flow channels are configured in a parallelogram.
The first set of air flow channels is configured as a right triangle with the hypotenuse of the parallelogram as the hypotenuse.
The air flow direction of the first set of air flow channels is arranged perpendicular to the air flow direction of the second set of air flow channels.
The third region 110 of the air flow field comprises a plurality of parallel third set of air flow channels, as indicated by the arrows. The third set of air flow channels is configured as a right triangle with the hypotenuse of the parallelogram as the hypotenuse. The air flow direction of the third set of air flow channels is arranged perpendicular to the air flow direction of the second set of air flow channels.
The right triangle of the first region 108 of the air flow field is inverted symmetrical to the right triangle of the third region 110 of the air flow field.
Every two flow passages in the second group of air flow passages are communicated with one flow passage in the first group of flow passages, and every two flow passages in the second group of air flow passages are communicated with one flow passage in the third group of air flow passages.
Each air flow channel in the flow field is a groove on the front side of the cathode plate 1, and the groove is a protrusion or ridge on the back side of the cathode plate 1. The width of each runner 1081 (groove) in the first set of air runners is equal to the sum of the widths of two air runners 1091 (grooves) in the second set of air runners communicated with the first set of air runners; the width of each air flow passage 1101 (groove) in the third set of air flow passages is equal to the sum of the widths of two air flow passages (grooves) in the second set of air flow passages communicated with the third set of air flow passages.
And a bulge, namely an air flow field ridge, is arranged between adjacent flow channels (grooves) parallel to the front surface of the cathode plate 1. The width w1 of the ridge 1082 in the first set of air channels is the same as the width w3 of the ridge 1102 in the third set of air channels, and is greater than the width w2 of the ridge 1092 in the second set of air channels; wherein w1: w2= w3: the w2 value is 1 to 2.
As shown in fig. 2, a cooling medium inlet 206 and a cooling medium outlet 207 are respectively formed at two ends of the plate body of the anode plate 1, the cooling medium inlet 206 and the cooling medium outlet 207 are arranged along the width direction of the rectangle, and a first gas second passage and a second gas second passage are formed at intervals on the lower side of the plate body between the cooling medium inlet 206 and the cooling medium outlet 207; in an embodiment, the first gas second passage is configured as an anode air inlet 204 and the second gas second passage is configured as an anode hydrogen inlet 201; the upper side of the plate body between the cooling medium inlet 206 and the outlet 207 is provided with a first gas second passage opening at an interval, and a second gas second passage opening; in an embodiment, the first gas second passage is configured as an anode air outlet 205 and the second gas second passage is configured as an anode hydrogen outlet 203. Wherein the anode air inlet 204 and the cathode hydrogen outlet 203 are disposed near the cooling medium inlet 206, i.e., near the cooling medium inlet 206. The outlet 205 for the anode air, the anode hydrogen inlet 201, are arranged at a far end from the cooling medium inlet 206, i.e. at the far end of the cooling medium inlet 206 (i.e. at the near end of the cooling medium outlet 207). In the embodiment, an anode hydrogen inlet 201, a cathode hydrogen outlet 203 and an anode air outlet 205 are arranged, and an anode air inlet 204 is arranged in a crossed symmetry mode at the center of a plate body. The openings may be, but are not limited to, the same shape and size. The openings of the cooling medium inlet 206 and the cooling medium outlet 207 are the same in shape and size.
The anode hydrogen inlet 201, the anode hydrogen outlet 203 and the anode air outlet 205 are arranged along the length direction of the rectangle, so that the size of the opening can be fully utilized. The coolant inlet 206 and the coolant outlet 207 are arranged in the width direction so as to make full use of the width dimension, and the largest possible flow area for the coolant to flow in and out is provided, which contributes to an increase in the amount of the coolant to flow in.
The dark borders along the edge of the anode plate 2 in fig. 2 are the anode hydrogen inlet 201, the anode hydrogen outlet 203, the anode air outlet 205, the cooling medium inlet 206, and the sealing position 211 of the outlet 207 on the front surface of the anode plate 2, which may be configured as a sealing groove or directly coated with a sealing glue.
Wherein the sealing position around the cooling medium inlet 206 is an open frame, and the opening is the flowing direction of the cooling medium, which is indicated by the arrow in the figure. The seal of the open frame upper side is located at the outer end of the anode hydrogen outlet 203. The sealing site on the lower side of the open frame extends to the inner end of the anode hydrogen gas inlet 201.
The sealing position around the cooling medium outlet 207 is an open frame, and the opening is the outflow direction of the cooling medium, as indicated by the arrow in the figure. The sealing position of the upper side of the frame of the opening extends to (ends at) the inner end part of the hydrogen outlet 203, and the sealing position of the lower side of the frame of the opening ends at the outer end part of the anode hydrogen inlet 201.
The sealing position around the anode hydrogen inlet 201 is an open frame, and the opening is the hydrogen flow direction, which is indicated by the arrow in the figure. The sealing positions at the two ends of the open frame are respectively overlapped with the sealing position at the lower side of the frame with the opening of the cooling medium outlet 207 and the extending sealing position at the lower side of the frame with the opening of the cooling medium inlet 206.
The sealing position around the anode hydrogen outlet 203 is an open frame, and the opening is the hydrogen outflow direction, which is indicated by the arrow in the figure. The sealing positions at the two ends of the frame with the opening are respectively overlapped with the extending sealing position at the upper side of the frame with the opening of the cooling medium inlet 206 and the extending sealing position at the upper side of the frame with the opening of the cooling medium outlet 207.
The sealing positions around the anode air inlet 204 and the anode air outlet 205 are all closed frames.
The front surface of the anode plate 1 is a hydrogen flow field; including a hydrogen flow field first region 210 proximate the coolant inlet (i.e., anode plate first active region), an air flow field second region 109 (i.e., anode plate second active region), and an air flow field third region 110 proximate the coolant outlet (anode plate third active region).
The first region 210 of the hydrogen flow field includes a plurality of parallel first set of flow channels for hydrogen gas, which are shown by the arrows in the figure, and which are the direction of flow of the hydrogen gas.
The second region 209 of the hydrogen flow field comprises a second plurality of parallel flow channels for hydrogen gas, as indicated by the arrows; the second group of flow channels of the hydrogen gas are arranged along the width direction of the anode plate 1, and the width in the width direction is fully utilized. The hydrogen second set of flow channels are configured as parallelograms.
The first set of flow channels for hydrogen gas is configured as a right triangle with the hypotenuse of the parallelogram as the hypotenuse.
The hydrogen flow direction of the first set of flow channels is arranged perpendicular to the hydrogen flow direction of the second set of flow channels.
The third region 110 of the hydrogen flow field includes a plurality of parallel third set of flow channels of hydrogen gas, as indicated by the arrows. Which is the inflow direction of hydrogen. The third group of flow channels for hydrogen gas is configured as a right triangle with the hypotenuse of the parallelogram as the hypotenuse. The hydrogen flow direction of the hydrogen third group of flow channels is configured to be vertical to the hydrogen flow direction of the hydrogen second group of flow channels.
The right triangle of the first region 210 of the hydrogen flow field is inverted symmetrical to the right triangle of the third region 208 of the hydrogen flow field.
Every two flow channels in the second group of hydrogen flow channels are communicated with one flow channel in the first group of flow channels, and every two flow channels in the second group of hydrogen flow channels are communicated with one flow channel in the third group of hydrogen flow channels.
Each hydrogen flow channel in the flow field is a groove on the front surface of the anode plate 1, and the groove is a bulge or ridge relative to the back surface of the anode plate 1. The width of each flow channel 2101 (groove) in the first set of hydrogen flow channels is equal to the sum of the widths of two hydrogen flow channels 2091 (grooves) in the second set of hydrogen flow channels communicated with the flow channels; the width of each hydrogen flow passage 2081 (groove) in the third set of hydrogen flow passages is equal to the sum of the widths of the two hydrogen flow passages (grooves) in the second set of hydrogen flow passages communicated with the groove.
The adjacent flow channels (grooves) parallel to the front surface of the anode plate 2 are provided with bulges, namely hydrogen flow field ridges. The width w1 of the ridge 2102 in the first group of flow channels of hydrogen is the same as the width w3 of the ridge 2082 in the third group of flow channels of hydrogen, and both the widths are greater than the width w2 of the ridge 2092 in the second group of flow channels of hydrogen; wherein w1: w2= w3: the w2 value is 1-2.
The gas flow fields on the front sides of the anode plate and the cathode plate are formed by mutually turning the horizontal axes of the anode plate and the cathode plate by 180 degrees, and the axes are in the rectangular length direction.
The back surfaces of the cathode plate 1 and the anode plate 2 are shown in figures 3 and 4; in the figure, dark color parts in the middle of the polar plate enclosed by the openings are respectively a negative plate 1 and a back groove (cooling medium flow passage) of a positive plate 2, and white color parts are respectively the back ridge of the negative plate 1 and the back ridge of the positive plate 2.
The flow field of the cooling medium of the cathode plate comprises a first vertical groove part 301 which is arranged at the outermost layer of the inlet of the cooling medium of the cathode plate and is vertical to the flowing direction of the cooling medium, and a first parallel groove part which is communicated with one end of the first vertical groove part and is parallel to the flowing direction (arrow direction) of the cooling medium, wherein the length of the first vertical groove part 301 is not less than that of the inlet of the cooling medium of the cathode plate; the first parallel groove portion 302 of the cathode plate is located at the upper side of the cathode plate and is communicated with the upper portion of the first vertical groove portion 301, and the first parallel groove portion 302 extends over the hydrogen outlet 105 of the cathode plate and terminates at the inner end sealing position of the air outlet of the cathode plate.
The cooling medium flow field at the cathode plate cooling medium inlet end also includes a plurality of grooves parallel to the outermost first vertical groove portion, which is opposite to the air flow field first region 108 at the front side of the cathode plate.
A second vertical groove portion 303 disposed at an outermost layer of the plate coolant outlet in a direction perpendicular to the coolant outflow direction, a second parallel groove portion 303 communicating with one end of the second vertical groove portion, the second parallel groove portion being parallel to the coolant inflow direction (arrow direction); the length of the second vertical groove part is not less than the length of the cathode plate cooling medium outlet; the second parallel groove portion 304 of the cathode plate is located at the lower side of the cathode plate and is communicated with the lower portion of the second vertical groove portion 303, and the second parallel groove portion 304 extends through the hydrogen inlet 104 of the cathode plate and ends at the inner end sealing position of the air inlet of the cathode plate.
The cooling medium flow field at the cathode plate cooling medium outlet end further comprises a second plurality of vertical grooved sections parallel to the outermost layer, which are opposite to the third section 110 of the air flow field at the front side of the cathode plate.
The cooling medium flow field also includes a middle cooling medium flow field communicating the cathode plate cooling medium outlet end cooling medium flow field with the cathode plate cooling medium inlet end cooling medium flow field, which is referred to as the cathode middle parallel cooling medium flow field, relative to the second region 109 of the air flow field on the front side of the cathode plate, and the cathode middle parallel cooling medium flow field includes a plurality of mutually parallel cathode grooves 120, parallel to the cooling medium flow direction.
The anode plate cooling medium flow field comprises an anode first vertical groove part 401 which is arranged at the outermost layer of the anode cooling medium inlet and is vertical to the flowing direction of the cooling medium, and an anode first parallel groove part which is communicated with one end of the anode first vertical groove part and is parallel to the flowing direction (arrow direction) of the cooling medium, wherein the length of the anode first vertical groove part 401 is not less than that of the cathode plate cooling medium inlet; an anode first parallel groove 402 in the anode plate is located on the underside of the anode plate and communicates with the lower portion of the anode first vertical groove 401. The anode first parallel groove 402 extends through the anode plate air inlet 204 to terminate in the anode plate hydrogen inlet inner end seal.
The coolant flow field at the coolant inlet end of the anode plate also includes a plurality of grooves parallel to the outermost anode first vertical groove portion, which is opposite the anode front face hydrogen flow field first region 210.
A second anode vertical groove 403 arranged at the outermost layer of the outlet of the plate cooling medium and vertical to the outflow direction of the cooling medium, and a second parallel groove communicated with one end of the second anode vertical groove, the second parallel groove being parallel to the inflow direction (arrow direction) of the cooling medium; the length of the second vertical groove part of the anode is not less than the length of the cooling medium outlet of the anode plate; a second parallel groove 404 in the anode plate is located on the upper side of the anode plate and communicates with the upper portion of the second vertical groove 403. The second parallel groove 404 extends past the air outlet 205 of the anode plate and terminates in a hydrogen outlet inner end seal of the anode plate.
The cooling medium flow field at the anode plate cooling medium outlet end also includes a plurality of grooves parallel to the outermost anode second vertical groove portion opposite the air flow field third region 208 of the anode plate front face.
The anode cooling medium flow field further comprises an anode middle cooling medium flow field communicating the anode plate cooling medium outlet end cooling medium flow field with the anode plate cooling medium inlet end cooling medium flow field, the region is a hydrogen flow field second region 209 opposite to the anode plate front surface, and is called an anode middle parallel cooling medium flow field, and the anode middle parallel cooling medium flow field comprises a plurality of mutually parallel anode grooves 220 which are parallel to the flow direction of the cooling medium.
As shown in fig. 7, a first plurality of communication grooves 1001 are formed between a first vertical groove portion at the outermost layer of an inlet in the cooling medium flow field on the back surface of the cathode plate 1 and/or the anode plate 2 and a third vertical groove portion 1004 adjacent thereto, and a second plurality of communication grooves 1002 are formed between a second vertical groove portion at the outermost layer of an outlet in the cooling medium flow field on the back surface of the cathode plate and a fourth vertical groove portion adjacent thereto.
In the embodiment, because a plurality of communication grooves (which are convex relative to the front surface of the polar plate) are arranged on the convex (ridge) part on the back surface of the polar plate, the depth of the plurality of communication grooves cannot be more than or equal to the height of the convex part; that is, the depth of the plurality of communicating grooves can not be more than or equal to the depth of the plate gas flow channel.
The cold zone medium flow field after the back-to-back lamination of the anode plate and the cathode plate is shown in FIGS. 5,6 and 7; the cooling medium flow field in the middle of the anode is superposed with the cooling medium flow field in the middle of the cathode, namely a plurality of parallel cathode grooves are superposed with a plurality of parallel anode grooves, so that the flow area of the medium is greatly increased, and the cooling effect is improved.
As shown in fig. 5, the back surfaces of the cathode and anode plates meet to form a coolant flow field through which coolant flows. The region a1 between the air inlet on the cathode plate and the active region is an interrupted ridge, the region a2 between the air inlet on the anode plate and the active region is a continuous ridge, and after the air inlet on the anode plate and the active region are attached to each other, cooling liquid can enter the region a1 from the region a2 and then flows into all ridges of the active region I in the cathode plate; the region b1 between the hydrogen outlet and the active region on the cathode plate is a continuous ridge, the region b2 between the hydrogen outlet and the active region on the anode plate is an intermittent ridge, and after the two are attached to each other, the cooling liquid can enter the region b2 from the region b1 and then flows into all ridges of the active region I in the anode plate; the region c1 between the air outlet on the cathode plate and the active region is a discontinuous ridge, the region c2 between the air outlet on the anode plate and the active region is a continuous ridge, and after the air outlet on the anode plate and the active region are attached to each other, cooling liquid can enter the region c2 from the region c1, and then the cooling liquid is discharged from the outlet; the region d1 between the hydrogen inlet and the active region on the cathode plate is a continuous ridge, the region d2 between the hydrogen inlet and the active region on the anode plate is an intermittent ridge, and after the hydrogen inlet and the active region are attached to each other, cooling liquid can enter the region d1 from the region d2, and then the cooling liquid is discharged from the outlet.
As shown in fig. 5, in the cooling water flow field, the cooling water inlet and outlet are directly connected with the ridge on the outermost circle of the active area, the cooling water can directly flow into the ridge on the outermost circle, and the ridge on the outermost circle can increase the width so as to reduce the flowing speed of the cooling liquid and reduce the pressure loss of the cooling liquid flow field. At the corner near the hydrogen outlet, the first active area 108 of the cathode plate and the second active area 109 of the cathode plate are partially overlapped with the first active area 210 of the anode plate and the second active area 209 of the anode plate, and the ridge of the cathode plate is overlapped with the ridge of the anode plate, so that the cooling water in the ridge of the outer ring of the cathode plate can flow into the active area ridge of the anode plate through the overlapping part; at the corner near the air inlet, the first active area 108 and the second active area 109 of the cathode plate are partially overlapped with the first active area 210 and the second active area 209 of the anode plate, and the ridge of the cathode plate and the ridge of the anode plate are mutually overlapped, so that the cooling water in the ridge of the outer ring of the anode plate can flow into the ridge of the active area of the cathode plate through the overlapping part; at the corner near the air outlet, the third active area 110 of the cathode plate and the second active area 109 of the cathode plate are partially overlapped with the third active area 208 of the anode plate and the second active area 209 of the anode plate, and the ridge of the cathode plate and the ridge of the anode plate are overlapped with each other, so that the cooling water in the ridge of the active area of the cathode plate can flow into the ridge of the outer ring of the anode plate through the overlapping part and then is discharged from the cooling water outlet; at the corner near the hydrogen inlet, the cathode plate third active region 110 and the cathode plate second active region 109 partially overlap with the anode plate third active region 208 and the anode plate second active region 209, and the ridge of the cathode plate and the ridge of the anode plate are overlapped with each other, so that the cooling water in the ridge of the anode plate active region can flow into the outer ring ridge of the cathode plate through the overlapping part and then is discharged from the cooling water outlet.
Claims (11)
1. A metal bipolar plate distributed in a Z-shaped flow field area comprises a plate body, wherein the front surface of the plate body is configured into a gas flow field; the back surface of the plate body is configured as a cooling medium flow field; the cooling device is characterized in that a cooling medium inlet and a cooling medium outlet are respectively arranged at two ends of the polar plate body, a gas channel port is arranged on the polar plate body between the cooling medium inlets and the cooling medium outlets, and the gas channel port comprises a first gas channel port and a second gas channel port which are respectively arranged at two sides of the polar plate body near the cooling medium inlets; a first gas second passage and a second gas second passage are respectively arranged on two sides of the polar plate body at the far end of the cooling medium inlet;
the cooling medium flow field includes:
a first vertical groove portion arranged at the outermost layer of the polar plate cooling medium inlet and vertical to the flowing direction of the cooling medium, and a first parallel groove portion communicated with one end of the first vertical groove portion, wherein the first parallel groove portion is parallel to the flowing direction of the cooling medium, or vertical to the flowing direction of the first gas channel opening, or vertical to the flowing direction of the second gas channel opening; the length of the first vertical groove part is not less than the length of the cooling medium inlet of the cathode plate;
the first parallel groove part extends through the hydrogen outlet of the cathode plate and is stopped at the inner end sealing position of the air outlet of the cathode plate;
the inlet end of the cathode plate for cooling medium also comprises a plurality of grooves parallel to the first vertical groove part of the outermost layer, and the fifth area is opposite to the first area of the air flow field on the front surface of the cathode plate; a second vertical groove part which is arranged at the outermost layer of the cooling medium outlet and is vertical to the flowing direction of the cooling medium, and a second parallel groove part which is communicated with one end of the second vertical groove part, wherein the second parallel groove part is parallel to the flowing direction of the cooling medium, or is vertical to the flowing direction of the first gas second channel opening, or is vertical to the flowing direction of the second gas second channel opening; the length of the second vertical groove part is not less than the length of the cathode plate cooling medium outlet;
the second parallel groove part extends through the hydrogen inlet of the cathode plate and is stopped at the inner end sealing position of the air inlet of the cathode plate;
the cooling medium flow field at the cooling medium outlet end of the cathode plate also comprises a plurality of grooves parallel to a second vertical groove part of the outermost layer, and a sixth area is opposite to a third area of the air flow field on the front surface of the cathode plate;
the cooling medium flow field also comprises a middle cooling medium flow field communicated with the cooling medium flow field at the outlet end of the cooling medium of the cathode plate and the cooling medium flow field at the inlet end of the cooling medium of the cathode plate, a seventh area is a second area of the air flow field opposite to the front surface of the cathode plate, which is called a cathode middle parallel cooling medium flow field, and the cathode middle parallel cooling medium flow field comprises a plurality of mutually parallel cathode grooves which are parallel to the flow direction of the cooling medium;
the first parallel groove part and the second parallel groove part are positioned on the outermost layers of two sides of the cooling medium flow field.
2. A metallic bipolar plate for "Z" shaped flow field area distribution as defined in claim 1, wherein: the positive gas flow field of polar plate body includes:
the first region is near the cooling medium inlet of the pole plate, the second region is near the cooling medium outlet of the pole plate, and the third region is near the cooling medium outlet of the pole plate; the gas flow field of the first area comprises a plurality of parallel first groups of flow channels, the first groups of flow channels are parallel to the first vertical groove part and are communicated with the first gas first channel opening, the gas flow field of the third area comprises a plurality of parallel third groups of flow channels, the third groups of flow channels are parallel to the second vertical groove part and are communicated with the first gas second channel opening, the gas flow field of the second area comprises a plurality of parallel second groups of flow channels, and the second groups of flow channels are parallel to the first parallel groove part; at least every two flow passages in the second group of flow passages are communicated with one flow passage in the first group of flow passages, and at least every two flow passages in the second group of flow passages are communicated with one flow passage in the third group of flow passages.
3. A metallic bipolar plate for "Z" shaped flow field area distribution as defined in claim 1, wherein: the polar plate body comprises a negative plate and a positive plate; the first gas is air, and the second gas is hydrogen; the import of hydrogen, the import of air all dispose in the same one side of negative plate and anode plate, the export of hydrogen, the export of air all disposes in the opposite side of negative plate and anode plate, the import of hydrogen, the import of air, the export of hydrogen, the export cross symmetry setting of air.
4. A metallic bipolar plate for the distribution of "Z" shaped flow field regions as claimed in claim 1 or 3, wherein: an air inlet of a cathode plate in the plate body is arranged at the near end of the cooling medium inlet, and a hydrogen inlet arranged at the same side is arranged at the far end of the cooling medium inlet; the air outlet on the other side of the cathode plate is arranged at the far end of the cooling medium inlet, and the hydrogen outlet on the other side of the cathode plate is arranged at the near end of the cooling medium inlet; the first parallel groove part on the back of the cathode plate is positioned at the near end of the hydrogen outlet, starts from the sealing position of the end part of the hydrogen outlet, extends over the hydrogen outlet and ends at the internal sealing position of the air outlet; a second parallel groove portion on the back side of the cathode plate is located proximate the hydrogen inlet, starting at a hydrogen inlet end seal location, extending across the hydrogen inlet and ending at an air inlet internal seal location.
5. A metallic bipolar plate for the distribution of "Z" shaped flow field regions as claimed in claim 1 or 3, wherein: an air inlet of an anode plate in the plate body of the anode plate is arranged at the near end of the cooling medium inlet, and a hydrogen inlet arranged at the same side is arranged at the far end of the cooling medium inlet; the air outlet at the other side of the anode plate is arranged at the far end of the cooling medium inlet, and the hydrogen outlet at the other side of the anode plate is arranged at the near end of the cooling medium inlet; the first parallel groove part on the back of the anode plate is positioned at the near end of the air inlet, extends from the air inlet end sealing position to the air outlet and stops at the hydrogen inlet end sealing position; a second parallel groove portion is formed in the back surface of the anode plate and is located at the proximal end of the air outlet, and starts from the air outlet end sealing position, extends over the air outlet and ends at the hydrogen outlet inner sealing position.
6. A metallic bipolar plate with Z-shaped flow field area distribution as in claim 1 or 3 wherein the second area of the air flow field in the gas flow field is a parallelogram surrounded by the second set of flow channels, and the first area of the air flow field is a right triangle surrounded by the first set of flow channels, with the hypotenuse of the parallelogram as the hypotenuse; the third area in the air flow field is a right triangle which is enclosed by the third group of flow channels and takes the hypotenuse of the parallelogram as the hypotenuse.
7. A metallic bipolar plate for a Z-shaped flow field area distribution as in claim 1 or 3 wherein the ridges in the first set of flow channels in the gas flow field have the same width as the ridges in the third set of flow channels, and are each greater than the ridges in the second set of flow channels.
8. The metallic bipolar plate with Z-shaped flow field area distribution as claimed in claim 1 or 3, wherein the second area of the hydrogen flow field in the gas flow field is a parallelogram enclosed by the second set of flow channels, and the first area of the hydrogen flow field is a right-angled triangle enclosed by the first set of flow channels and having the hypotenuse of the parallelogram as the hypotenuse; the third area in the hydrogen flow field is a right-angled triangle which is enclosed by the third group of flow channels and takes the hypotenuse of the parallelogram as the hypotenuse.
9. A metallic bipolar plate having a Z-shaped flow field region distribution as in claim 1, wherein the total length of each flow channel in the gas flow field is the same.
10. A metallic bipolar plate having a Z-shaped flow field region distribution as in claim 8, wherein the total length of each flow channel in the gas flow field is the same.
11. The metallic bipolar plate for "Z" shaped flow field area distribution as in claim 1, wherein a first plurality of communication grooves are defined between the first vertical groove portion of the outermost layer at the inlet in the cooling medium flow field on the back of the cathode plate and/or the anode plate and the third vertical groove portion adjacent thereto, and a second plurality of communication grooves are defined between the second vertical groove portion of the outermost layer at the outlet in the cooling medium flow field on the back of the cathode plate and/or the anode plate and the fourth vertical groove portion adjacent thereto.
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| CN114597437A (en) * | 2022-03-16 | 2022-06-07 | 浙江锋源氢能科技有限公司 | Metal bipolar plate and direct methanol fuel cell |
| CN115621485B (en) * | 2022-12-20 | 2023-03-21 | 上海氢晨新能源科技有限公司 | Bipolar plate flow field structure, fluid flow direction control method thereof and fuel cell |
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| JP5090651B2 (en) * | 2006-03-02 | 2012-12-05 | 本田技研工業株式会社 | Fuel cell |
| US9761894B2 (en) * | 2013-07-05 | 2017-09-12 | Daimler Ag | Porous inserts for improved coolant distribution in bipolar plate assemblies for fuel cells |
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| CN109904480A (en) * | 2017-12-07 | 2019-06-18 | 中国科学院大连化学物理研究所 | A kind of bipolar plates with new flow field structure |
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