Bipolar plate for fuel cell and cell device

Abstract

The invention discloses a bipolar plate for a fuel cell. The bipolar plate comprises a cathode plate, an anode plate and a cooling gas channel, a plurality of parallel cathode gas channels are formed on the upper surface of the cathode plate, so that cathode gas flows out from the cathode gas outlet; a plurality of anode gas channels are formed in the lower surface of the anode plate so that anode gas can flow out from the anode gas outlets, and the anode plate and the cathode plate are overlapped; the cooling gas channel is formed between the upper surface of the anode plate and the lower surface of the cathode plate so that cooling gas can flow out from a cooling gas outlet, and the cooling gas outlet and the cathode gas outlet are located on the same side of the bipolar plate; wherein a bulge is formed in each of the plurality of cathode gas channels close to the cathode gas outlet.

Description

Technical Field

[0001] The present invention relates to a bipolar plate and a battery device, and more particularly to a bipolar plate including a cathode plate and an anode plate for a hydrogen fuel cell and a battery device including the bipolar plate. Background Art

[0002] In the field of hydrogen fuel cells, a fuel cell of a unit (cell) is composed of a cathode plate, an anode plate and a membrane electrode assembly. In order to increase the power of the fuel cell, the fuel cells of the units are connected together in series to form a fuel cell module. Specifically, after stacking the cathode plate, the membrane electrode assembly, and the anode plate of a unit fuel cell in sequence to form an electrode core, then stacking the cathode plate, the membrane electrode assembly, and the anode plate of another unit fuel cell in sequence. In other words, the anode plate of the first electrode core and the cathode plate of the second electrode core are stacked on each other to form a so-called bipolar plate.

[0003] Based on the reaction principle of hydrogen fuel cells, generally, a reaction gas such as hydrogen is introduced into the anode plate, and a reaction gas such as air is introduced into the cathode plate to obtain oxygen. The chemical reaction of the reaction gas at the membrane electrode assembly is, for example, an anodic reaction (H2 → 2H + + 2e - ), a cathodic reaction (O2 + 4H + + 4e - → 2H2O) or a cathodic reaction (H2 + 1 / 2O2 → H2O). How to configure the flowing reaction gas to have a high-efficiency chemical reaction at the membrane electrode assembly in a compact bipolar plate space to obtain good power generation efficiency, or to improve the flow efficiency of the cooling gas between the cathode plate and the anode plate to increase the cooling efficiency, have always been the goals that the field to which the present invention belongs has continuously invested in and desired to achieve. In addition, since the cathode plate and the anode plate in the bipolar plate are usually extremely thin metal plates, the stacking support structure of the two also needs to uniformly have high support force and does not affect the fluidity of the reaction gas or the cooling gas, etc. Therefore, there is an urgent need for a design of a bipolar plate to improve the gas channel configuration on the anode plate and the cathode plate, the cooling gas channel between the anode plate and the bipolar plate, and the support structure between the anode plate and the cathode plate, so as to obtain more significant high power generation efficiency and high reliability in battery operation. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a bipolar plate for a fuel cell, which includes a cathode plate, an anode plate, and a cooling gas channel. A plurality of mutually parallel cathode gas channels are formed on the upper surface of the cathode plate for the cathode gas to flow out from the cathode gas outlet; a plurality of anode gas channels are formed on the lower surface of the anode plate for the anode gas to flow out from the anode gas outlet, and the anode plate is laminated with the cathode plate; the cooling gas channel is formed between the upper surface of the anode plate and the lower surface of the cathode plate for the cooling gas to flow out from the cooling gas outlet, and the cooling gas outlet and the cathode gas outlet are located on the same side of the bipolar plate; wherein bulges are respectively formed at positions close to the cathode gas outlet in the plurality of cathode gas channels.

[0005] In the bipolar plate according to the present invention, the plurality of bulges are arranged in a straight line and the straight line is parallel to one side of the cathode plate.

[0006] In the bipolar plate according to the present invention, the height of the bulge is one-half to one-third of the depth of the plurality of cathode gas channels.

[0007] In the bipolar plate according to the present invention, the length of the bulge is equal to 1 to 1.5 times the width of one of the plurality of cathode gas channels.

[0008] In the bipolar plate according to the present invention, a plurality of first support blocks are formed on the lower surface of the cathode plate, and a plurality of second support blocks are formed on the upper surface of the anode plate, and the anode plate is laminated with the cathode plate so that the plurality of first support blocks respectively abut against the plurality of second support blocks.

[0009] In the bipolar plate according to the present invention, the plurality of first support blocks are arranged at the edge of the cathode plate at the same interval, and the plurality of second support blocks are arranged at the edge of the anode plate at the same interval, and the plurality of first support blocks and the plurality of second support blocks are respectively protrusions on the cathode plate and the anode plate, and the plurality of first support blocks and the plurality of second support blocks form a plurality of openings on the side of the bipolar plate, and the directions of the plurality of openings are parallel to the direction of the cooling gas outlet.

[0010] In the bipolar plate according to the present invention, the plurality of first support blocks and the plurality of second support blocks have the same number, height, width, and length.

[0011] In the bipolar plate according to the present invention, the plurality of anode gas channels have a plurality of bends to form a substantially Z-shaped channel profile.

[0012] In the bipolar plate according to the present invention, a step is formed near the cooling gas inlet of the cooling gas channel. There is an offset in the position between the starting point of the step and the inlet of the cathode gas channel, such that the starting point of the step corresponds to the downstream of the inlet end of the cathode gas channel in position.

[0013] The present invention further provides a battery device, which includes a plurality of bipolar plates as described above; and a plurality of membrane electrode assemblies, wherein each of the plurality of membrane electrode assemblies is disposed between any two of the plurality of bipolar plates.

[0014] At least by the technical feature of "forming a bulge near the cathode gas outlet in each of the plurality of cathode gas channels" in the present invention, the cathode gas can have a slower flow rate in the upstream region of the bulge in the cathode gas channel due to the generation of back pressure. The cathode gas can obtain sufficient reaction time with the membrane electrode assembly in this region, improving the overall power generation efficiency of the fuel cell. In addition, a jet effect is generated in the downstream region of the bulge, and the reacted gas or the remaining cathode gas can thereby increase the flow rate of leaving the cathode gas outlet. Since the cooling gas outlet and the cathode gas outlet are located on the same side of the bipolar plate, increasing the gas flow rate at the cathode gas outlet can draw the flow rate of the fluid flowing out of the cooling gas outlet, thereby increasing the flow rate of the cooling gas in the cooling gas channel and increasing the cooling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 A perspective view showing a bipolar plate according to an embodiment of the present invention;

[0017] Figure 2 An exploded view showing a bipolar plate according to an embodiment of the present invention;

[0018] Figure 3 A perspective view showing a cathode plate according to an embodiment of the present invention;

[0019] Figure 4 Showing Figure 3 A partially enlarged view of the cathode plate at IV;

[0020] Figure 5 Showing Figure 3 A partially enlarged view of the cathode plate at V;

[0021] Figure 6Shows a perspective view of an anode plate according to an embodiment of the present invention;

[0022] Figure 7 Shows Figure 6 A partially enlarged view of the anode plate at VII;

[0023] Figure 8 Shows Figure 6 A partially enlarged view of the anode plate at VIII;

[0024] Figure 9A Shows a perspective view and a partially enlarged view of an anode plate according to an embodiment of the present invention;

[0025] Figure 9B Shows another perspective view and another partially enlarged view of an anode plate according to an embodiment of the present invention;

[0026] Figure 10 Shows a top view of an anode plate according to an embodiment of the present invention;

[0027] Figure 10A Shows Figure 10 An end perspective view along the section line A - A.

[0028] Symbol description:

[0029] B, bipolar plate, D1, first flow direction, D2, second flow direction, D3, third flow direction, D4, fourth flow direction, D5, fifth flow direction, F, cathode gas flow direction, L, length of the bulge, O, offset, W, width, 1, anode plate, 11, main anode gas channel, 12, anode gas channel, 12a, inlet end, 12b, outlet end, 121, first straight channel, 122, first bend, 123, second straight channel, 124, second bend, 125, third straight channel, 126, third bend, 127, fourth straight channel, 128, fourth bend, 129, fifth straight channel, 13a, first long side, 13b, second long side, 14, short side, 15, second support block, 151, first opening, 152, second opening, 16, upper surface, 17, lower surface, 18, anode gas outlet, 2, reaction gas seal, 3, membrane electrode plate, 4, cathode plate, 41, main cathode gas channel, 42, cathode gas channel, 42a, inlet end, 42b, outlet end, 421, bottom surface, 422, upstream region, 423, downstream region, 43, cathode gas outlet, 44a, first long side, 44b, second long side, 45, short side, 46, bulge, 461, top surface, 47, first support block, 471, opening, 48, upper surface, 49, lower surface, 5, first cooling gas seal, 6, second cooling gas seal, 71, cooling gas channel, 73, cooling gas outlet, 74, step, 74a, starting point. Detailed Implementation Manner

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0032] Figure 1 Shown is a bipolar plate B according to an embodiment of the present invention, which includes an anode plate 1 and a cathode plate 4 stacked on each other.

[0033] According to an embodiment of the present invention, a fuel cell formed by stacking bipolar plates as shown in Figure 1 may include components such as a housing, a blower, a cooling fan, a plurality of battery modules, and a voltage measurement connector. A blower is connected to the upper surface of the housing, which is used to provide a hydrogen gas flow from a gas cylinder filled with a reaction gas such as hydrogen into the battery module. A cooling fan is connected to the side surface of the housing, and the cooling fan provides an air flow from the external environment into the housing into the battery module to provide a cooling gas. The battery module is composed of a plurality of battery cells formed by plate members such as the bipolar plate B in series, and the number of battery cells can be arranged according to the required power of the battery. In this embodiment, a battery module is composed of 12 battery cells as a unit, and a fuel cell with a unit stack is formed by connecting three battery modules in series. In this embodiment, the power of the fuel cell can reach approximately 1 kW. However, the present invention is not limited thereto. If the number of battery modules is increased to, for example, 9, a fuel cell with a power of approximately 3 kW can be obtained.

[0034] See Figure 2, which shows a single cell of an embodiment of a battery module, and the single cell is composed of a bipolar plate B. In this embodiment, the bipolar plate may be sequentially composed of an anode plate 1, a first cooling gas seal 5, a second cooling gas seal 6, a cathode plate 4, a reaction gas seal 2, and a membrane electrode plate 3 by laminating. The anode plate 1, the cathode plate 4, and the reaction gas seal 2 have the same and generally rectangular outer contours. There is a hollow portion at the center of the reaction gas seal 2 that conforms to the rectangular membrane electrode plate 3, so that the membrane electrode plate 3 can be inserted into the reaction gas seal 2 to form a plate member. The position of the membrane electrode plate 3 corresponds to the reaction gas channels (to be described in detail later) of the anode plate 1 and the cathode plate 4 respectively, thereby defining the reaction space of the single cell. The contours of the first cooling gas seal 5 and the second cooling gas seal 6 respectively conform to the inlet anode gas channel and the outlet anode gas channel of the anode plate 4, ensuring that the anode gas can flow in the gas channels formed on the anode plate 1 without leaking to the external environment or other gas channels. In this embodiment, the anode gas may be hydrogen.

[0035] See Figures 3 to 5 , which shows the cathode plate 4 according to an embodiment of the present invention. Figure 3 A perspective view showing the cathode plate 4; Figure 4 Showing Figure 3 A partially enlarged view of the cathode plate at IV; and Figure 5 Showing Figure 3 A partially enlarged view of the cathode plate at V.

[0036] As Figure 3As shown, in this embodiment, the cathode plate 4 forms a main cathode gas channel 41 and a plurality of cathode gas channels 42 connected to the downstream of the main cathode gas channel 41 on its upper surface 48. The extension direction of the main cathode gas channel 41 (i.e., the direction of cathode gas flow) is parallel to the first long side 44a or the second long side 44b of the cathode plate 4. The plurality of cathode gas channels 42 act as a manifold to be connected to one side of the main cathode gas channel 41 parallel to the first long side 44a or the second long side 44b to form an inlet end 42a and extend along the short side 45 of the cathode plate 4 to the first long side 44a of the cathode plate 4 to form an outlet end 42b. The outlet end 42b also serves as a cathode gas outlet 43 of the cathode gas, so that the reacted gas or the remaining cathode gas is discharged from the first long side 44a of the cathode plate (which is also one side of the bipolar plate B). The plurality of cathode gas channels 42 are parallel to each other and their extension direction is perpendicular to the extension direction of the main cathode gas channel 41 and parallel to the short side 45 of the cathode plate 4, and one cathode gas channel is adjacent to another cathode gas channel, so that the upper surface 48 of the cathode plate 4 is covered with cathode gas channels 42 except for other configurations, such as the above-mentioned main cathode gas channel 41, the first support block 47, and the cathode gas inlet upstream of the main cathode gas channel 41. In this way, the cathode gas channel 42, which provides the cathode gas and the membrane electrode plate 3 for contact, can provide as large a reaction space as possible, promote the reaction opportunity and efficiency, and thus improve the power generation efficiency of the fuel cell. According to this embodiment of the present invention, the depth of the cathode gas channel 42 can be, for example, between 0.2 and 0.5 mm, preferably 0.35 mm.

[0037] Matching Figure 4, a plurality of cathode gas channels 42 are formed with a plurality of protrusions 46 near the cathode gas outlet 43 (i.e., near the first long side 44a of the cathode plate 4 or the outlet end 42b of the cathode gas channel 42), and are respectively arranged in each of the plurality of cathode gas channels 42. The plurality of protrusions 46 in each respective cathode gas channel 42 are arranged in a straight line and this straight line is parallel to one side (the first long side 44a or the second long side 44b) of the cathode plate 4. The height of the protrusion 46 is one-half to one-third of the depth of the cathode gas channel 42, for example, between 0.07 and 0.25 mm, preferably 0.2 mm. The height of the protrusion 46 referred to herein is the vertical height difference between the top surface 461 of the protrusion 46 and the bottom surface 421 of the cathode gas channel 42, and the "vertical" referred to herein is the direction perpendicular to the upper surface 48 of the cathode plate 4. The length L of the protrusion 46 (i.e., the distance parallel to the extending direction of the cathode gas channel 42 or the direction of cathode gas flow) is substantially equal to the width of the cathode gas channel 42, for example, in the range of 1 mm to 3 mm, preferably 1.58 mm. However, the present invention is not limited thereto, and the width of the cathode gas channel 42 or the length L of the protrusion 46 can be determined according to the size of the cathode plate of the fuel cell stack and the coverage range of the cathode gas channel providing the reaction space on the cathode plate.

[0038] According to an embodiment of the present invention, the protrusion 46 in the cathode gas channel 42 divides the cathode gas channel 42 into an upstream region 422 and a downstream region 423. The upstream region 422 is generally defined as the region from the inlet end 42a of the cathode gas channel 42 to the protrusion 46, and the downstream region 423 is generally defined as the region from the protrusion 46 to the outlet end 42b of the cathode gas channel 42. Since the protrusion 46 reduces the cross-sectional area of the flow channel for the cathode gas to flow through in the cathode gas channel 42, a back pressure is provided in the upstream region 422, that is, a reverse resistance is encountered during the flow of the cathode gas. According to the law of conservation of mass of the fluid, the fluid in the upstream region 422 with a wider channel has a slower flow rate, while the fluid entering the region with a narrower channel formed due to the formation of the protrusion 46 has a faster flow rate. Benefiting from the slower flow rate of the cathode gas in the upstream region 422, the cathode gas has additional reaction time and opportunities to react with the membrane electrode assembly in this region, thereby increasing the reaction efficiency and improving the overall power generation efficiency of the fuel cell. And due to the fluid injection effect generated by the formation of a narrower channel with the protrusion 46 provided upstream, the flow rate of the gas in the downstream region 423 is faster, so that the flow rate of the gas leaving the cathode gas channel 42 from the cathode gas outlet 43 is also increased, as Figure 9BAs shown, the side of the bipolar plate B formed by laminating the cathode plate 4, the anode plate 1, and other plate members is shown. The cathode gas outlet 43 and the cooling gas outlet 73 according to an embodiment of the present invention are located on the same side of the bipolar plate B and are adjacent to each other. This enables an increase in the flow rate of the gas leaving the cathode gas outlet 43 to draw the cooling gas from the cooling gas outlet 73, thereby increasing the flow rate of the cooling gas leaving the cooling gas outlet 73, and further increasing the overall flow rate of the cooling gas flowing in the cooling gas channel 71 formed between the cathode plate 4 and the anode plate 1, which can accelerate the removal of the heat generated after the reaction from the battery cell. Thus, without adjusting the pumping power of the cooling gas, the cooling efficiency can be improved in an energy-saving manner.

[0039] Returning to Figure 3 and Figure 4 , according to an embodiment of the present invention, the distance of the protrusion 46 from the cathode gas outlet 43 or the outlet end 42b is approximately 3 to 5 times its length, for example, within the range of 2 mm to 7 mm, preferably 4.74 mm. However, the present invention is not limited thereto, as long as a distance can be maintained between the protrusion 46 and the cathode gas outlet 43 such that an increase in the flow rate of the gas affected by the fluid jet effect generated by the protrusion 46 does not cause turbulence at the cathode gas outlet 43. In other words, the presence of the downstream region 423 will slightly slow down the flow rate of the gas leaving the protrusion 46, achieving a flow stabilization effect, and further stabilizing the flow of the gas leaving the cathode gas outlet 43, thereby improving the efficiency of the overall device operation.

[0040] As Figure 3 and Figure 5 shown, according to an embodiment of the present invention, a plurality of first support blocks 47 may be formed on the lower surface 49 of the cathode plate 4. Specifically, the plurality of first support blocks 47 may be bumps protruding from the lower surface 49. When the cathode plate 4 and the anode plate 1 are laminated to form a battery cell of a fuel cell, the plurality of first support blocks 47 may respectively abut against a plurality of second support blocks 15 (to be described in detail later) formed on the anode plate 1. The plurality of first support blocks 47 may be disposed on the second long side 44b of the cathode plate 4, that is, a plurality of first support blocks 47 are formed on an edge along the side opposite to the first long side 44a where the cathode gas outlet 43 is formed. The plurality of first support blocks 47 may be arranged at the same interval on the edge or the second long side 44b of the cathode plate 4. The first support block 47 may have a specific height, width, and length L, and respectively have the same height, width, and length as the plurality of second support blocks 15 formed on the anode plate 1 (to be described in detail later).

[0041] Figure 6 Shows a perspective view of an anode plate according to an embodiment of the present invention; Figure 7 Shows Figure 6 a partially enlarged view of the anode plate at VII; Figure 8Display Figure 6 Partial enlarged view of the anode plate at VIII;

[0042] Figure 9A Perspective view and partial enlarged view of the anode plate according to an embodiment of the present invention; Figure 9B Another perspective view and another partial enlarged view of the anode plate according to an embodiment of the present invention.

[0043] According to an embodiment of the present invention, as Figure 6As shown, a plurality of anode gas channels 12 are formed on the lower surface 17 of the anode plate 1 for the anode gas flowing in the main anode gas channel 11 to enter the anode gas channel 12 from the inlet end 12a of the anode gas channel 12, flow in the anode gas channel 12, and then leave the anode plate 1 from the anode gas outlet 18 formed at the outlet end 12b of the anode gas channel 12. The anode gas channel 12 functions as a reaction space for the anode gas such as hydrogen to react with the membrane electrode plate 3. According to this embodiment, the plurality of anode gas channels 12 formed on the anode plate 1 have a plurality of bends (for example, the first bend 122, the second bend 124, the third bend 126, and the fourth bend 128) to form a generally Z-shaped channel profile. After entering the anode plate 1, the anode gas first flows in the main anode gas channel 11 and then enters the plurality of anode gas channels 12 serving as a manifold from the inlet end 12a under a pumping pressure. It should be noted that the inlet ends 12a of the plurality of anode gas channels 12 are flush with each other, so that the ports of the inlet ends 12a are arranged in a straight line parallel to the short side 14 of the anode plate 1. Then, the anode gas flows along the first flow direction D1 in the first straight channel 121 of the plurality of anode gas channels 12, and the first flow direction D1 can be parallel to the first long side 13a and the second long side 13b of the anode plate 1. After flowing through the first straight channel 121, the anode gas turns at the first bend 122 and flows along the second flow direction D2 in the second straight channel 123, and the second flow direction D2 can be parallel to the short side 14 of the anode plate 1. After flowing through the second straight channel 123, the anode gas turns at the second bend 124 and flows along the third flow direction D3 in the third straight channel 125, and the third flow direction D3 can be parallel to the first long side 13a and the second long side 13b of the anode plate 1 and is opposite to the first flow direction D1. After flowing through the third straight channel 125, the anode gas turns at the third bend 126 and flows along the fourth flow direction D4 in the fourth straight channel 127, and the fourth flow direction D4 can be parallel to the short side 14 of the anode plate 1 and is opposite to the second flow direction D2. After flowing through the fourth straight channel 127, the anode gas turns at the fourth bend 128 and flows along the fifth flow direction D5 in the fifth straight channel 129, and the fifth flow direction D5 can be parallel to the first long side 13a and the second long side 13b of the anode plate 1 and is opposite to the third flow direction D3 but is the same as the first flow direction D1. Finally, the anode gas leaves the anode gas channel 12 at the outlet end 12b of the anode gas channel 12 and enters the anode gas outlet 18. According to the anode gas channel of the present invention, because it has at least two bends or at least two flow directions, for example, the four bends in this embodiment enable the anode gas to flow as long a distance and time as possible under the same area, which is conducive to enabling the anode gas to fully react with the membrane electrode plate in the reaction space, making the reaction more complete, and thus improving the efficiency.It should be noted that the anode gas channels of the present invention are not limited to having only four bends or five flow directions. Depending on the anode plates of different areas or the anode gases of different flow rates, in order to make the reaction more complete, the anode gas of the present invention may have more than four bends or more than five flow directions.

[0044] As Figure 7 and Figure 8 shown, according to an embodiment of the present invention, a plurality of second support blocks 15 may be formed on the upper surface 16 of the anode plate 1. Specifically, the plurality of second support blocks 15 may be bumps protruding from the upper surface 16. The plurality of second support blocks 15 may be disposed on the first long side 13a of the anode plate 1, that is, a plurality of second support blocks 15 are formed on the edge of the first long side 13a; and a plurality of second support blocks 15 are also disposed on the second long side 13b opposite to the first long side 13a, that is, a plurality of second support blocks 15 are formed on the edge of the second long side 13b. The plurality of second support blocks 15 are arranged at the same intervals on the edges (the first long side 13a and the second long side 13b) of the anode plate 1. The second support block 15 may have a specific height, width W, and depth, and as described above, has the same height, width, and depth as the plurality of first support blocks 47 formed on the cathode plate 4 respectively. When the anode plate 1 and the cathode plate 4 are stacked to form a fuel cell core, as Figure 9A shown, the plurality of second support blocks 15 on the second long side 13b of the anode plate 1 may respectively abut against the plurality of first support blocks 47 formed on the second long side 44b of the cathode plate 4, so that a second opening 152 is formed outwardly by the second support block 15 and an opening 471 is formed outwardly by the first support block 47 on the side of the bipolar plate. Since the first support block 47 and the second support block 15 have the same height, and the corresponding widths W and lengths may have the same area, and their positions correspond to each other, when they abut against each other, their areas can be conformably fitted. This results in that when the cathode plate 4 and the anode plate 1 are stacked to form a core and gas is introduced and the gas pressure is borne, the acting force and the reaction force generated by their abutment can be evenly dispersed. In the case where the cathode plate 4 and the anode plate 1 are extremely thin, the durability and reliability of the bipolar plate can be enhanced. As Figure 9BAs shown, when the anode plate 1 and the cathode plate 4 are stacked to form a fuel cell core, a plurality of second support blocks 15 on the first long side 13a of the anode plate 1 can abut against the cathode gas channel 42 at the first long side 44a of the cathode plate 4, so that the second support blocks 15 and the upper surface 16 of the anode plate 1 and the cathode gas channel 42 of the cathode plate 4 form a cooling gas outlet 73 of the cooling gas channel 71, and a cooling gas such as air flows out from here. On the other hand, the second support blocks 15 and the membrane electrode assembly 3 above form a first opening 151 outward. The first opening 151 has a width in the range of, for example, 2.5 mm to 7.5 mm, preferably 5.03 mm, and there may be 2 to 3 ridges on its bottom surface abutting against the cathode gas channel 42. According to an embodiment of the present invention, the ridge of the cathode gas channel 42 has a top surface that can fit with the bottom surface of the first opening 151, which also causes the cathode plate 4 and the anode plate 1 to be stacked to form a core, and when gas is introduced and the gas pressure is applied, the acting force and the reaction force generated by the two abutting against each other can be evenly dispersed. In the case where the cathode plate 4 and the anode plate 1 are extremely thin, the durability and reliability of the bipolar plate can be enhanced.

[0045] Figure 10 A top view showing an anode plate according to an embodiment of the present invention; and Figure 10A Show Figure 10 The end view three-dimensional view along the section line A-A.

[0046] According to an embodiment of the present invention, as Figure 10 And Figure 10A Shown, a cooling gas channel 71 is formed between the lower surface of the cathode plate 4 relative to the upper surface 48 and the upper surface 16 of the anode plate 1. A step 74 is formed near the inlet of the cooling gas channel 71, and the starting point 74a of the step 74 is downstream of the inlet end 42a of the cathode gas channel 42 in terms of position. Specifically, as Figure 10A Shown, if the upper surface 48 of the cathode plate 4 is formed on the x-y plane, the definition of the relative position between the starting point 74a and the inlet end 42a refers to the z direction. In the z direction, the starting point 74a does not correspond to the inlet end 42a but there is an offset O in the x direction, so that for the cathode gas flow direction F ( Figure 10AIn the -x direction), the starting point 74a of the step 74 is located downstream of the inlet end 42a of the cathode gas 42. According to this embodiment, this offset O can be, for example, between 0.1 and 2 mm, but the present invention is not limited thereto, as long as the following effects can be achieved and this offset O can be within any appropriate size range. The height of the step 74, that is, the distance in the z direction between the upper surface 16 of the anode plate 1 and the top surface of the step 74, can be approximately one-half to one-third of the depth of the anode gas channel 12, for example, between 0.075 mm and 0.3 mm, preferably 0.175 mm. By providing the step 74 according to the present invention, the cooling gas can be compressed at the cooling gas inlet 72 of the cooling gas channel 71, and the cooling gas ascends upward along the contour of the starting point 74a of the step 74 and just enters the cathode gas channel 42 corresponding to the channel contour formed by the lower surface 49 ( Figure 10A not marked in the figure, relative to the upper surface 48), so that the cooling gas can flow into the cooling gas channel 71 relatively smoothly, reducing the obstruction in the channel and accelerating the flow rate, thereby improving the cooling efficiency of the cooling gas and quickly taking away the heat generated by the reaction from the battery cell.

[0047] In this article, specific examples are used to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A bipolar plate for a fuel cell, characterized in that: a cathode plate, on the upper surface of which a plurality of cathode gas channels parallel to each other are formed for the cathode gas to flow out from the cathode gas outlet; an anode plate, on the lower surface of which a plurality of anode gas channels are formed for the anode gas to flow out from the anode gas outlet, and the anode plate is superposed with the cathode plate; and a cooling gas channel formed between the upper surface of the anode plate and the lower surface of the cathode plate for the cooling gas to flow out from the cooling gas outlet, and the cooling gas outlet and the cathode gas outlet are located on the same side of the bipolar plate; wherein bulges are respectively formed at positions close to the cathode gas outlet in the plurality of cathode gas channels.

2. The bipolar plate according to claim 1, wherein A plurality of the bulges are arranged in a straight line and the straight line is parallel to one side of the cathode plate.

3. The bipolar plate according to claim 1, wherein The height of the bulge is one-half to one-third of the depth of the plurality of cathode gas channels.

4. The bipolar plate according to claim 1, wherein, The length of the bulge is equal to 1 to 1.5 times the width of one of the plurality of cathode gas channels.

5. The bipolar plate according to claim 1, wherein A plurality of first support blocks are formed on the lower surface of the cathode plate, and a plurality of second support blocks are formed on the upper surface of the anode plate, and wherein the anode plate and the cathode plate are superposed so that the plurality of first support blocks respectively abut against the plurality of second support blocks.

6. The bipolar plate according to claim 5, wherein The plurality of first support blocks are arranged at the edge of the cathode plate at the same interval, and the plurality of second support blocks are arranged at the edge of the anode plate at the same interval, and wherein the plurality of first support blocks and the plurality of second support blocks are respectively protrusions on the cathode plate and the anode plate, and the plurality of first support blocks and the plurality of second support blocks form a plurality of openings at the side of the bipolar plate, and the directions of the plurality of openings are parallel to the direction of the cooling gas outlet.

7. The bipolar plate according to claim 6, characterized in that, The plurality of first support blocks and the plurality of second support blocks have the same number, height, width and length.

8. The bipolar plate according to claim 1, wherein, The plurality of anode gas channels have a plurality of bends to form a substantially Z-shaped channel profile.

9. The bipolar plate according to claim 1, wherein A step is formed at a position close to the cooling gas inlet of the cooling gas channel, and there is an offset in position between the starting point of the step and the inlet of the cathode gas channel, so that the starting point of the step corresponds to the downstream of the inlet end of the cathode gas channel in position.

10. A battery device, characterized in that: a plurality of bipolar plates according to any one of claims 1 to 9; and a plurality of membrane electrode assemblies, each of which is disposed between any two of the plurality of bipolar plates.

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