Bipolar plate and fuel cell stack

Abstract

The invention discloses a bipolar plate and a fuel cell stack, the bipolar plate comprises a cooling plate and two polar plates stacked on two sides of the cooling plate, the cooling plate comprises a cooling flow channel, each polar plate comprises a flow field, the flow field comprises a reaction zone and two distribution zones located on two sides of the reaction zone, and the reaction area on at least one polar plate penetrates through the polar plate along the arrangement direction of the cooling plate and the polar plate. The reaction areas of the bipolar plate penetrate through the corresponding polar plates, the depth of the reaction areas is increased, a more stereoscopic three-dimensional air channel structure is formed, and the air channel structure has more flowing space in the depth direction, so that fluid in the reaction areas can flow in the extending direction and the depth direction of the reaction areas at the same time; and the flowing fluency of fluid in the reaction area is improved.

Description

Technical Field

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

[0002] A fuel cell stack is a power generation device that directly converts the chemical energy of an oxidant and a fuel into electrical energy based on a redox reaction. The bipolar plate is a key component of a fuel cell stack. The oxidant reaction zone and the fuel reaction zone are respectively arranged on both sides of the bipolar plate. The two sides of the bipolar plate can produce a redox reaction after being combined with a proton exchange membrane. Flow channels are generally arranged in the oxidant reaction zone and the fuel reaction zone to guide the oxidant and the fuel to various areas of the bipolar plate. However, due to the small thickness of the bipolar plate and the limited depth of the flow channel, the oxidant and the fuel in the flow channel can often only flow along the extension direction of the flow channel. Especially in the oxidant reaction zone, due to the relatively large molecular volume of the oxidant, the flow is more difficult, which seriously affects the power generation efficiency of the fuel cell stack.

[0003] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0004] The object of the present invention is to provide a method for solving the problem that gas in the reaction zone of the existing bipolar plate cannot flow smoothly.

[0005] In order to achieve the above-mentioned purpose, a specific embodiment of the present invention provides a bipolar plate, including a cooling plate and two polar plates stacked on both sides of the cooling plate, the cooling plate includes a cooling flow channel, the polar plate includes a flow field, the flow field includes a reaction zone and two distribution zones located on both sides of the reaction zone, and the reaction zone on at least one polar plate penetrates the polar plate along the arrangement direction of the cooling plate and the polar plate.

[0006] In one or more embodiments of the present invention, the two distribution areas on at least one electrode plate penetrate the electrode plate along the arrangement direction of the cooling plate and the electrode plate.

[0007] In one or more embodiments of the present invention, one of the two polar plates is a cathode plate, and the cathode plate includes one or more stacked cathode plates.

[0008] In one or more embodiments of the present invention, one of the two polar plates is an anode plate, and the anode plate includes one or more stacked anode plates.

[0009] In one or more embodiments of the present invention, the cathode plate includes a plurality of cathode plates stacked together, and the cathode plate close to the cooling plate and the other cathode plates are made of different materials.

[0010] In one or more embodiments of the present invention, the anode plate includes a plurality of stacked anode plates, and the anode plate close to the cooling plate is made of different materials from the other anode plates.

[0011] In one or more embodiments of the present invention, the cathode plate includes a first flow field that penetrates the anode plate along the arrangement direction of the cathode plate and the cooling plate, the first flow field includes a first reaction zone, the first reaction zone includes a plurality of first reaction channels, and the plurality of first reaction channels on two adjacent cathode plates correspond one to one.

[0012] In one or more embodiments of the present invention, the cathode single plate includes a hollow portion and a plurality of partition bars arranged in the hollow portion and arranged at intervals, a plurality of first reaction channels are formed between adjacent partition bars and between the partition bars at the end and the adjacent side walls of the hollow portion, and the adjacent partition bars and between the partition bars at the end and the adjacent side walls of the hollow portion are connected by connecting blocks.

[0013] In one or more embodiments of the present invention, the cathode plate includes a plurality of stacked cathode plates, and in the arrangement direction of the cathode plates, two connecting blocks in two adjacent first reaction channels are spaced apart in the extension direction of the first reaction channels.

[0014] In one or more embodiments of the present invention, the thickness of the connecting block is smaller than the depth of the first reaction channel.

[0015] In one or more embodiments of the present invention, the first flow field further includes two first distribution zones disposed on both sides of the first reaction zone.

[0016] In one or more embodiments of the present invention, the anode plate includes a second flow field that penetrates the anode plate along the arrangement direction of the anode plate and the cooling plate, the second flow field includes a second reaction zone and two second distribution zones spaced apart on both sides of the second reaction zone, the anode plate is made of a porous material, and the second reaction zone and the two second distribution zones are connected through pores inside the anode plate.

[0017] In one or more embodiments of the present invention, the cooling plate includes a flow channel plate and a first partition plate and a second partition plate respectively stacked on both sides of the flow channel plate. The flow channel plate includes a plurality of isolation parts extending from the first partition plate to the second partition plate, and a cooling flow channel is formed between two adjacent isolation parts.

[0018] In one or more embodiments of the present invention, the flow channel plate also includes a plurality of first connection parts and a plurality of second connection parts, and the plurality of first connection parts and the plurality of second connection parts are alternately distributed in the arrangement direction of the cooling flow channel, and a single first connection part is connected to one side of two adjacent isolation parts close to the first partition plate, and a single second connection part is connected to one side of two adjacent isolation parts close to the second partition plate.

[0019] Another aspect of the present invention provides a fuel cell stack, which includes the bipolar plate mentioned above.

[0020] Compared with the prior art, the reaction zone on the bipolar plate of the present invention penetrates the corresponding polar plate, which can increase the depth of the reaction zone and form a more three-dimensional airway structure. The airway structure has more flow space in the depth direction, so that the fluid in the reaction zone can flow along the extension direction and depth direction of the reaction zone at the same time, thereby improving the smoothness of the fluid flow in the reaction zone. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 3D diagram of the bipolar plate in the first embodiment of the present invention;

[0023] Figure 2 This is an exploded structural diagram of a bipolar plate in Embodiment 1 of the present invention;

[0024] Figure 3 The exploded structure diagram of the cathode plate in the first embodiment of the present invention;

[0025] Figure 4 is a planar structural diagram of a cathode plate in Embodiment 1 of the present invention;

[0026] Figure 5 It is a partial structural diagram of the cathode plate in the first embodiment of the present invention;

[0027] Figure 6 is a planar structural diagram of an anode single plate in Embodiment 1 of the present invention;

[0028] Figure 7 It is a partial structural diagram of the anode single plate in the first embodiment of the present invention;

[0029] Figure 8 This is an exploded structural diagram of a cooling plate in Embodiment 1 of the present invention;

[0030] Fig. 9 This is a side structural diagram of a cooling plate in Embodiment 1 of the present invention;

[0031] Fig.10 This is an exploded structural diagram of a fuel cell stack in Embodiment 2 of the present invention.

[0032] Description of main reference numerals: 100, bipolar plate, 1, polar plate, 11, cathode plate, 111, cathode single plate, 1111, hollow portion, 1112, separator, 1113, connection block, 12, anode plate, 121, anode single plate, 2, cooling plate, 21, flow channel plate, 211, isolation portion, 212, first connection portion, 213, second connection portion, 22, first separator, 23, second separator, a, flow field, a1, reaction zone, a2, distribution zone, b, first flow field, b1, first reaction zone , b11, first reaction channel, b2, first distribution area, c, second flow field, c1, second reaction zone, c11, second reaction channel, c2, second distribution area, c21, first segment, c22, second segment, c23, third segment, d, cooling channel, e, oxidant delivery hole, f, fuel delivery hole, 200, membrane electrode, 300, sealing ring, 400, cathode monopolar plate, 500, anode monopolar plate, 600, insulating layer, 700, end plate, 800, bolts, 900, nuts. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0034] Embodiment 1:

[0035] Reference Figures 1 to 9 As shown, this embodiment provides a bipolar plate 100, which includes a cooling plate 2 and two pole plates 1, the two pole plates 1 are stacked on both sides of the cooling plate 2, the cooling plate 2 includes a cooling flow channel d, the pole plate 1 includes a flow field a, the flow field a includes a reaction area a1 and a distribution area a2 located on both sides of the reaction area a1, the reaction area a1 on the two pole plates 1 penetrates the pole plate 1 along the arrangement direction of the cooling plate 2 and the pole plate 1 to increase the depth of the reaction area a1 and form a more three-dimensional three-dimensional airway structure, which has more flow space in the depth direction, and the fluid in the reaction area a1 can not only flow along the extension direction of the reaction area a1, but also flow along the depth direction of the reaction area a1, thereby improving the smoothness of the fluid flow in the reaction area a1.

[0036] Furthermore, the cooling channel d is separated from the flow field a on the electrode plate 1, which can improve the heat exchange efficiency between the cooling fluid in the cooling channel d and the electrode plate 1 and the fluid in the flow field a, thereby improving the cooling efficiency.

[0037] Furthermore, in this embodiment, the distribution area a2 on the two electrode plates 1 penetrates the electrode plates 1 along the arrangement direction of the cooling plates 2 and the electrode plates 1 .

[0038] In other embodiments, only the reaction area a1 on one electrode plate 1 may penetrate the electrode plate 1 along the arrangement direction of the cooling plate 2 and the electrode plate 1 .

[0039] In this embodiment, one of the two plates 1 is a cathode plate 11 , and the other is an anode plate 12 .

[0040] The structure of the cathode plate 11 in this embodiment is further introduced below.

[0041] Reference Figure 2 and Figure 3 As shown, the cathode plate 11 in this embodiment includes a plurality of stacked cathode plates 111. In other embodiments, the cathode plate 11 may also be composed of only one cathode plate 111.

[0042] Before the bipolar plate 100 in this embodiment is assembled to the fuel cell stack, the plurality of cathode plates 111 do not need to be stacked to form the cathode plate 11. When assembled to the fuel cell stack, the cathode plates 111 can be assembled and stacked in sequence by an operator to form the cathode plate 11. Alternatively, the plurality of cathode plates 111 can also be formed into the cathode plate 11 by bonding, stamping, machining, etc. before being assembled to the fuel cell stack.

[0043] In this embodiment, each cathode single plate 111 includes a first flow field b, and the first flow field b penetrates the anode single plate 121 along the arrangement direction of the cathode single plate 111 and the cooling plate 2. The first flow field b includes a first reaction area b1, and the first reaction area b1 includes a plurality of first reaction channels b11. The plurality of first reaction channels b11 on two adjacent cathode single plates 111 correspond to each other and are interconnected.

[0044] It should be understood that after the two cathode plates 111 are stacked together, the two adjacent first reaction channels b11 on the two adjacent cathode plates 111 form a complete channel structure in the arrangement direction of the cathode plates 111. When the oxidant enters the channel structure, it can not only flow along the extension direction of the channel structure, but also flow along the depth direction of the channel structure, thereby improving the smoothness of the oxidant flow.

[0045] Reference Figure 5 As shown, in order to form the first reaction flow channel b11, a hollow portion 1111 is constructed on the cathode single plate 111 in this embodiment, and a plurality of spaced-apart dividing bars 1112 are arranged in the hollow portion 1111. A plurality of first reaction flow channels b11 are formed between adjacent dividing bars 1112, and two first reaction flow channels b11 are formed between the dividing bars 1112 at the two ends and the side walls of the adjacent hollow portion 1111.

[0046] Furthermore, in order to fix the position of the dividing strip 1112 and prevent the dividing strip 1112 from being separated from the hollow portion 1111, adjacent dividing strips 1112 are connected via connecting blocks 1113, and the dividing strips 1112 at both ends are also connected to the adjacent side walls of the hollow portion 1111 via connecting blocks 1113.

[0047] In this embodiment, the thickness of the connecting block 1113 is substantially consistent with the depth of the first reaction channel b11. The connecting block 1113 is equivalent to dividing the single first reaction channel b11 into two parts. To ensure that the two parts of the single first reaction channel b11 are interconnected, the first reaction channel b11 on the adjacent cathode plate 111 can be used as a transition channel.

[0048] In one embodiment, referring to Figure 3 As shown, the cathode plate 11 includes two stacked cathode plates 111. When the oxidant in the first reaction channel b11 of the first cathode plate 111 flows to the connecting block 1113 inside it, the oxidant can flow to the corresponding first reaction channel b11 on the second cathode plate 111, and then pass through the first reaction channel b11 of the second cathode plate 111 over the connecting block 1113, and then flow back to the first reaction channel b11 of the first cathode plate 111 through the first reaction channel b11 of the second cathode plate 111.

[0049] Similarly, after the oxidant in the first reaction channel b11 of the second cathode single plate 111 flows to the connecting block 1113 inside the cathode single plate 111 , it can pass over the connecting block 1113 in the above-mentioned manner.

[0050] In other embodiments, when the cathode plate 11 is composed of three or more stacked cathode plates 111, the arrangement of the connecting block 1113 also follows the above principles. However, the difference from this embodiment is that when the oxidant in the first reaction channel b11 on a cathode plate 111 flows to the connecting block 1113, the oxidant flows to the first reaction channel b11 on the cathode plates 111 on both sides of the cathode plate 111.

[0051] In addition, in other embodiments, the thickness of the connection block 1113 may also be smaller than the depth of the first reaction channel b11, and the size difference between the connection block 1113 and the first reaction channel b11 enables the two parts of the first reaction channel b11 located on both sides of the connection block 1113 to be connected. In particular, for the cathode plate 11 composed of a single cathode plate 111, the thickness of the connection block 1113 generally needs to be smaller than the depth of the first reaction channel b11.

[0052] Reference Figure 4As shown, the first flow field b in this embodiment also includes two first distribution areas b2 arranged on both sides of the first reaction area b1, the first distribution area b2 includes a first edge adjacent to the first reaction area b1, and the multiple connecting blocks 1113 on the single cathode plate 111 are at equal or approximately equal distances from one of the first edges, and the first edge can be relatively close to or relatively far away from the connecting block 1113.

[0053] In other embodiments, the distances between the plurality of connection blocks 1113 and one first edge are equal or approximately equal, and the distances between the plurality of connection blocks 1113 and another first edge are also equal or approximately equal.

[0054] As an example, when the contour of one of the first edges is a straight line, the plurality of connection blocks 1113 on the single cathode plate 111 are arranged substantially along a direction parallel to the straight line.

[0055] As another example, when the profile of one of the first edges is an arc line, the plurality of connection blocks 1113 on the single cathode plate 111 are substantially arranged along a direction parallel to the arc line.

[0056] In other embodiments, a plurality of spaced connection blocks 1113 may be arranged between two adjacent dividing strips 1112 on a single cathode plate 111, which is equivalent to forming a plurality of columns of connection blocks 1113 on the single cathode plate 111, and the arrangement formation of each column of connection blocks 1113 is the same or approximately the same as the contour of at least one first edge.

[0057] The cathode single plate 111 in this embodiment can be made of graphite material or metal material, and the metal material includes but is not limited to aluminum, titanium, stainless steel and other metal materials and alloys of the above-mentioned materials.

[0058] The surface of the cathode single plate 111 may also be plated, and the coating materials include but are not limited to gold, silver, platinum, ruthenium, iridium, palladium and graphite, and the coating thickness is between 0.05-10 μm.

[0059] The cathode single plate 111 close to the cooling plate 2 and the other cathode single plates 111 can be made of different materials, which is helpful for the diffusion of the oxidant in the first reaction channel b11 and ensures that the oxidant can be fully and effectively utilized.

[0060] The structure of the anode plate 12 in this embodiment is further described below.

[0061] Reference Figure 2 , Figure 6 and Figure 7 As shown, the anode plate 12 in this embodiment includes one anode single plate 121. In other embodiments, the anode plate 12 may also be composed of a plurality of stacked anode single plates 121.

[0062] The anode plate 121 includes a second flow field c that penetrates the anode plate 121 along the arrangement direction of the anode plate 121 and the cooling plate 2. The second flow field c includes a second reaction zone c1 and two second distribution zones c2 that are spaced apart on both sides of the second reaction zone c1. The anode plate 121 is made of a porous material. The second reaction zone c1 is connected to the two second distribution zones c2 through the pores inside the anode plate 121.

[0063] Reference Figure 7 As shown, the second distribution area c2 in this example includes three segments, the first segment c21 is straight, the second segment c22 is arc-shaped, the second segment c22 is connected to one end of the first segment c21 and extends in a direction away from the first segment c21, the third segment c23 is straight and basically parallel to the first segment c21, and the third segment c23 extends from the other end of the second segment c22 in a direction away from the first segment c21.

[0064] It should be understood that since the anode plate 121 is made of porous material, the second flow field c on the anode plate 121 itself is not airtight, that is, the second flow field c is not a closed flow field a, and there is a possibility that the fuel in the second flow field c will leak from the edge of the anode plate 121. Therefore, when the bipolar plate 100 in this embodiment is applied to a fuel cell stack, it is necessary to be equipped with a corresponding sealing structure to seal the edge of the anode plate 121, and the sealing structure may use a sealing ring 300.

[0065] Reference Figure 6 and Figure 7 As shown, the second reaction zone c1 in this example includes a plurality of second reaction channels c11, and the plurality of second reaction channels c11 extend from the second distribution zone c2 on one side to the second distribution zone c2 on the other side. The ends of the plurality of second reaction channels c11 are at equal or approximately equal distances from the second reaction zones c1 on both sides.

[0066] The anode single plate 121 close to the cooling plate 2 and the other anode single plates 121 can be made of different materials, which is helpful for the diffusion of the fuel in the second reaction channel c11 and ensures that the fuel can be fully and effectively utilized.

[0067] The structure of the cooling plate 2 in this embodiment is further introduced below.

[0068] Reference Figure 8 and Fig. 9 As shown, the cooling plate 2 of this embodiment includes a flow channel plate 21 and a first partition plate 22 and a second partition plate 23 respectively stacked on both sides of the flow channel plate 21. The flow channel plate 21 includes a plurality of isolation parts 211 extending from the first partition plate 22 to the second partition plate 23. A cooling flow channel d is formed between two adjacent isolation parts 211. Each cooling flow channel d is independent of each other and not connected to each other.

[0069] Furthermore, the flow channel plate 21 also includes a plurality of first connection parts 212 and a plurality of second connection parts 213, and the plurality of first connection parts 212 and the plurality of second connection parts 213 are alternately distributed in the arrangement direction of the cooling flow channel d, and the first connection part 212 is connected to one side of two adjacent isolation parts 211 close to the first partition 22, and the second connection part 213 is connected to one side of two adjacent isolation parts 211 close to the second partition 23.

[0070] The plurality of isolating portions 211, the plurality of first connecting portions 212 and the plurality of second connecting portions 213 together constitute a flow channel plate 21 having a structure similar to a corrugated plate. On a plane perpendicular to the extension direction of the cooling flow channel d, the vertical projection of the cooling flow channel d can be in any shape.

[0071] In this embodiment, the single corrugated shape of the flow channel plate 21 is configured as an isosceles trapezoid, wherein two adjacent isolation portions 211 constitute two waists of the isosceles trapezoid.

[0072] In other embodiments, the single corrugation shape of the flow channel plate 21 may also be configured as a triangle, a square, a sine-cosine curve, or the like.

[0073] It should be understood that the first connection portion 212 and the second connection portion 213 are not necessary structures to constitute the flow channel plate 21. Multiple isolation portions 211 can be connected end to end to form multiple cooling channels d. Those skilled in the art can selectively omit any one or all of the first connection portion 212 and the second connection portion 213 according to the change of the single corrugation shape of the flow channel plate 21.

[0074] Reference Figure 8 As shown, the cooling plate 2 of this embodiment includes a second edge and a third edge arranged on the opposite side of the second edge, the cooling channel d extends from the second edge to the third edge, the cooling channel d completely penetrates the cooling plate 2, and at the second edge and the third edge, the cooling channel d is open.

[0075] Furthermore, the extension direction of the cooling channel d forms an angle with the flow direction of the fluid in the reaction zone a1.

[0076] Preferably, the extension direction of the first reaction channel b11 of this embodiment is parallel to the extension direction of the second reaction channel c11, and the extension direction of the cooling channel d is perpendicular to the extension directions of the first reaction channel b11 and the second reaction channel c11.

[0077] Specifically, in this embodiment, the cathode plate 11, the anode plate 12, and the cooling plate 2 are configured as rectangular plate structures, the first reaction channel b11 and the second reaction channel c11 extend along the length direction of the rectangle, and the cooling channel d extends along the width direction of the rectangle.

[0078] In this embodiment, the flow channel plate 21, the first partition plate 22, and the second partition plate 23 are made of metal materials. Preferably, the metal materials include but are not limited to titanium, aluminum, stainless steel, or alloys of the above materials.

[0079] The thickness of the flow channel plate 21, the first partition plate 22, and the second partition plate 23 is between 0.1 and 0.5 mm. The flow channel plate 21, the first partition plate 22, and the second partition plate 23 can be formed into the cooling plate 2 by welding, sintering, bonding, or other processing methods.

[0080] It can be seen from the above structures of the cooling plate 2 and the cathode plate 11 that the cooling channel d in the cooling plate 2 is completely independent of the first reaction channel b11 on the cathode plate 11, and the cooling fluid and the oxidant are completely isolated, which can fully improve the heat exchange efficiency between the cooling fluid and surrounding components, the oxidant and the fuel.

[0081] Other structures of the bipolar plate 100 in this embodiment are further introduced below.

[0082] Reference Figure 2 As shown, the bipolar plate 100 of this embodiment is provided with two oxidant delivery holes e and two fuel delivery holes f. The two oxidant delivery holes e are respectively located at two diagonal portions of the bipolar plate 100 , and the two fuel delivery holes f are respectively located at the other two diagonal portions of the bipolar plate 100 .

[0083] One of the oxidant delivery holes e is connected to a first distribution area b2 on the cathode plate 11 for inputting oxidant into the first distribution area b2, and another oxidant delivery hole e is connected to another first distribution area b2 on the cathode plate 11 for collecting the oxidant gathered in the first distribution area b2.

[0084] One of the fuel delivery holes f is connected to a second distribution area c2 on the anode plate 12 for inputting fuel into the second distribution area c2, and the other fuel delivery hole f is connected to another second distribution area c2 on the anode plate 12 for collecting the fuel gathered in the second distribution area c2.

[0085] Furthermore, on the axis of the oxidant delivery hole e, the first distribution area b2 on the cathode plate 11 intersects with the axis, while the anode plate 12 does not intersect with the axis, that is, the coverage area of ​​the anode plate 12 does not extend to the axis, and a avoidance portion is formed on the anode plate 12.

[0086] On the axis of the fuel delivery hole f, the portion of the cathode plate 11 other than the first reaction zone b1 and the first distribution zone b2 intersects with the axis, and the second distribution zone c2 on the anode plate 12 intersects with the axis, specifically, the end of the first segment c21 away from the second segment c22 intersects with the axis.

[0087] Embodiment 2:

[0088] Reference Fig.10 As shown, this embodiment provides a fuel cell stack, which includes a plurality of bipolar plates 100, a plurality of membrane electrodes 200, a plurality of sealing rings 300, a cathode monopolar plate 400 and an anode monopolar plate 500 in the first embodiment.

[0089] Specifically, a plurality of membrane electrodes 200 are arranged in a straight line between the cathode monopolar plate 400 and the anode monopolar plate 500 at intervals, a single bipolar plate 100 is alternately stacked between two adjacent membrane electrodes 200, a single sealing ring 300 is stacked between one side of the anode plate 12 of the bipolar plate 100 and the adjacent membrane electrode 200, and the sealing ring 300 is arranged around the anode plate 12 to seal the anode plate 12.

[0090] The flow field of the cathode monopolar plate 400 may be set to be similar to the first flow field b of the cathode monopolar plate 111 , and the flow field of the anode monopolar plate 500 may be set to be similar to the second flow field c of the anode monopolar plate 121 .

[0091] Furthermore, the fuel cell stack of this embodiment also includes two insulating layers 600, two end plates 700 and a fixing assembly, the two insulating layers 600 are respectively stacked on the outer sides of the cathode monopolar plate 400 and the anode monopolar plate 500, the two end plates 700 are respectively stacked on the outer sides of the two insulating layers 600, and the fixing assembly adopts bolts 800 and nuts 900, wherein the bolts 800 pass through the two end plates 700, and the nuts 900 are threadedly connected to both ends of the bolts 800 and are located on the outer sides of the end plates 700.

[0092] In various embodiments of the present invention, the oxidant includes but is not limited to air, and the fuel includes but is not limited to hydrogen. When used specifically, appropriate oxidants and fuels can be selected according to actual conditions.

[0093] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0094] In addition, it should be understood that although the present specification is described according to embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A bipolar plate (100), characterized in that: The invention comprises a cooling plate (2) and two electrode plates (1) stacked on both sides of the cooling plate (2), wherein the cooling plate (2) comprises a cooling flow channel (d), the electrode plate (1) comprises a flow field (a), the flow field (a) comprises a reaction area (a1) and two distribution areas (a2) located on both sides of the reaction area (a1), and the reaction area (a1) on at least one of the electrode plates (1) penetrates the electrode plate (1) along the arrangement direction of the cooling plate (2) and the electrode plate (1).

2. The bipolar plate (100) according to claim 1, characterized in that: The two distribution areas (a2) on at least one of the pole plates (1) penetrate the pole plate (1) along the arrangement direction of the cooling plate (2) and the pole plate (1).

3. The bipolar plate (100) according to claim 1, characterized in that: One of the two electrode plates (1) is a cathode plate (11), and the cathode plate (11) comprises one or more stacked cathode plates (111); or, One of the two pole plates (1) is an anode plate (12), and the anode plate (12) comprises one or more stacked anode single plates (121).

4. The bipolar plate (100) according to claim 3, characterized in that: The cathode plate (11) comprises a plurality of cathode single plates (111) stacked in layers, wherein the cathode single plate (111) close to the cooling plate (2) and the other cathode single plates (111) are made of different materials; or, The anode plate (12) comprises a plurality of anode single plates (121) stacked in layers, and the anode single plate (121) close to the cooling plate (2) and the other anode single plates (121) are made of different materials.

5. The bipolar plate (100) according to claim 3, characterized in that: The cathode single plate (111) includes a first flow field (b) that penetrates the anode single plate (121) along the arrangement direction of the cathode single plate (111) and the cooling plate (2), the first flow field (b) includes a first reaction zone (b1), the first reaction zone (b1) includes a plurality of first reaction channels (b11), and the plurality of first reaction channels (b11) on two adjacent cathode single plates (111) correspond one to one.

6. The bipolar plate (100) according to claim 5, characterized in that: The cathode single plate (111) comprises a hollow portion (1111) and a plurality of spacer bars (1112) arranged in the hollow portion (1111) and arranged at intervals, a plurality of first reaction channels (b11) are formed between adjacent spacer bars (1112) and between the spacer bars (1112) at the end and the adjacent side walls of the hollow portion (1111), and the adjacent spacer bars (1112) and between the spacer bars (1112) at the end and the adjacent side walls of the hollow portion (1111) are connected via a connecting block (1113).

7. The bipolar plate (100) according to claim 6, characterized in that: The cathode plate (11) comprises a plurality of cathode single plates (111) stacked in a stacked manner, wherein in the arrangement direction of the cathode single plates (111), two connecting blocks (1113) in two adjacent first reaction channels (b11) are spaced apart in the extension direction of the first reaction channels (b11); or, The thickness of the connection block (1113) is smaller than the depth of the first reaction channel (b11).

8. The bipolar plate (100) according to claim 5, characterized in that: The first flow field (b) further comprises two first distribution areas (b2) arranged on both sides of the first reaction area (b1).

9. The bipolar plate (100) according to claim 3, characterized in that: The anode plate (121) includes a second flow field (c) penetrating the anode plate (121) along the arrangement direction of the anode plate (121) and the cooling plate (2), the second flow field (c) includes a second reaction zone (c1) and two second distribution zones (c2) spaced apart on both sides of the second reaction zone (c1), the anode plate (121) is made of a porous material, and the second reaction zone (c1) and the two second distribution zones (c2) are connected through pores inside the anode plate (121).

10. The bipolar plate (100) according to claim 1, characterized in that: The cooling plate (2) comprises a flow channel plate (21) and a first partition plate (22) and a second partition plate (23) respectively stacked on both sides of the flow channel plate (21); the flow channel plate (21) comprises a plurality of isolation portions (211) extending from the first partition plate (22) to the second partition plate (23); a cooling flow channel (d) is formed between two adjacent isolation portions (211).

11. The bipolar plate (100) according to claim 10, characterized in that: The flow channel plate (21) further comprises a plurality of first connection parts (212) and a plurality of second connection parts (213), wherein the plurality of first connection parts (212) and the plurality of second connection parts (213) are alternately distributed in the arrangement direction of the cooling flow channel (d), a single first connection part (212) is connected to a side of two adjacent isolation parts (211) close to the first partition plate (22), and a single second connection part (213) is connected to a side of two adjacent isolation parts (211) close to the second partition plate (23).

12. A fuel cell stack, characterized in that: The invention comprises a bipolar plate (100) as claimed in any one of claims 1 to 11.

Images