CN113948741B - Current collecting plate heat dissipation structure and fuel cell stack - Google Patents

Current collecting plate heat dissipation structure and fuel cell stack Download PDF

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Publication number
CN113948741B
CN113948741B CN202111209665.XA CN202111209665A CN113948741B CN 113948741 B CN113948741 B CN 113948741B CN 202111209665 A CN202111209665 A CN 202111209665A CN 113948741 B CN113948741 B CN 113948741B
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China
Prior art keywords
current collecting
flow channels
collecting plate
plate
heat dissipating
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CN202111209665.XA
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CN113948741A (en
Inventor
陈文淼
朱晓春
郗富强
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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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
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04007—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
    • H01M8/04014—Heat exchange using gaseous fluids; Heat exchange by combustion of reactants
    • 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
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04007—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
    • H01M8/04067—Heat exchange or temperature measuring elements, thermal insulation, e.g. heat pipes, heat pumps, fins
    • 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
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • H01M8/2465—Details of groupings of fuel cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2250/00—Fuel cells for particular applications; Specific features of fuel cell system
    • H01M2250/20—Fuel cells in motive systems, e.g. vehicle, ship, plane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Abstract

The invention discloses a current collecting plate heat dissipation structure and a fuel cell stack, wherein the current collecting plate heat dissipation structure comprises a current collecting plate and an end plate, a groove for accommodating the current collecting plate is formed in one side of the end plate facing a stack assembly, a plurality of first bosses and first flow channels which are sequentially arranged at intervals are formed in the bottom surface of the groove, the first side surface of the current collecting plate contacts the bottom surface of the groove, the second side surface of the current collecting plate faces the stack assembly, a plurality of second bosses and second flow channels which are sequentially arranged at intervals are formed in the first side surface of the current collecting plate, and the second flow channels are alternately arranged and communicated with the first flow channels; wherein, the two end openings of the first flow channels extend to the two opposite side edges of the end plate and are communicated with the outside air, and/or the two end openings of the second flow channels extend to the two opposite side edges of the current collecting plate and are communicated with the outside air. The heat dissipation structure of the current collecting plate can timely and effectively dissipate heat of the current collecting plate, and meets the requirement of higher and higher volume power density of the fuel cell stack.

Description

Current collecting plate heat dissipation structure and fuel cell stack
Technical Field
The present invention relates to the field of fuel cells, and more particularly, to a heat dissipation structure of a current collecting plate and a fuel cell stack.
Background
In order to meet the increasing demands placed on the fuel cell stack volumetric power density (the ratio of the fuel cell stack output power to the volume) by the market and customers, the fuel cell stack output current is also increasing, resulting in more and more heat being generated and accumulated on the collector plates. The current collecting plates are conductive plates positioned at two ends of the electric pile and used for conducting current generated by the electric pile, and the current collecting plates are positioned between the monopole plates and the end plates of the fuel cell pile and can only conduct limited heat dissipation through heat conduction of the monopole plates and the end plates and natural convection heat exchange between the edges of the current collecting plates and air. The prior art has limited heat dissipation capacity, and the heat dissipation state of the current collecting plate is poor due to the heat preservation effect especially in the area close to the center and far away from the edge. When the temperature of a certain area of the current collecting plate exceeds the temperature bearing limit of the unipolar plate, the unipolar plate at the position is damaged, and finally accidents such as leakage, burning loss and even explosion of the fuel cell stack are caused.
Therefore, how to effectively dissipate heat from the current collecting plate is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
Therefore, the invention aims to provide a heat dissipation structure of a current collecting plate, which can timely and effectively dissipate heat of the current collecting plate and meet the requirement of higher and higher volume power density of a fuel cell stack. Another object of the present invention is to provide a fuel cell stack including the above-described collector plate heat dissipation structure.
In order to achieve the above object, the present invention provides the following technical solutions:
the utility model provides a current collecting plate heat radiation structure, includes current collecting plate and end plate, the end plate is equipped with the recess that is used for holding towards the pile subassembly one side of current collecting plate, the bottom surface of recess is equipped with many first bosss and first runner that interval was arranged in proper order, the first side surface of current collecting plate contacts the bottom surface of recess, the second side surface of current collecting plate is towards the pile subassembly, the first side surface of current collecting plate is equipped with many second bosss and second runner that interval was arranged in proper order, the second runner with first runner cross arrangement and intercommunication;
wherein, the two end openings of the first flow channels extend to the two opposite side edges of the end plate and are communicated with the outside air, and/or the two end openings of the second flow channels extend to the two opposite side edges of the current collecting plate and are communicated with the outside air.
Preferably, in the arrangement direction of the first flow channels, each first flow channel is sequentially arranged from the central part of the bottom surface of the groove to two ends in the arrangement direction;
and/or, in the arrangement direction of the second flow channels, each second flow channel is sequentially arranged from the central part of the first side surface of the current collecting plate to two ends in the arrangement direction.
Preferably, in the arrangement direction of the first flow channels, the distance between each adjacent first flow channels increases from the center to two ends in the arrangement direction;
and/or in the arrangement direction of the second flow channels, the distance between every two adjacent second flow channels is sequentially increased from the center to two ends of the arrangement direction.
Preferably, in the arrangement direction of the first flow channels, the widths of the first flow channels are equal, and the widths of the first bosses between every two adjacent first flow channels are sequentially increased from the center to two ends in the arrangement direction;
and/or in the arrangement direction of the second flow channels, the widths of the second flow channels are equal, and the widths of the second bosses between every two adjacent second flow channels are sequentially increased from the center to two ends of the arrangement direction.
Preferably, the widths of the adjacent first bosses differ by 0.2-0.5 mm, and/or the widths of the adjacent second bosses differ by 0.2-0.5 mm.
Preferably, in the arrangement direction of the first flow channels, each first flow channel is distributed from a central portion of a bottom surface of the groove to opposite side edges of the end plate;
and/or, in the arrangement direction of the second flow channels, each second flow channel is distributed from the central part of the first side surface of the current collecting plate to the two opposite side edges of the current collecting plate.
Preferably, each of the first flow channels is arranged in sequence along the width direction of the end plate, and/or each of the second flow channels is arranged in sequence along the length direction of the current collecting plate.
Preferably, the first flow channel and/or the second flow channel is a linear flow channel.
Preferably, each of the first flow channels is arranged in parallel, and/or each of the second flow channels is arranged in parallel.
Preferably, the end opening of the first flow passage communicating with the outside air and/or the end opening of the second flow passage communicating with the outside air has a guide opening structure with gradually decreasing width from outside to inside.
Preferably, the opening angle of the guiding opening structure is 0.8-1.5 degrees.
Preferably, the thickness of the current collecting plate is greater than or equal to the depth of the groove.
Preferably, the thickness of the current collecting plate is different from the depth of the groove by 0 to 0.2mm.
The invention provides a heat dissipation structure of a current collecting plate, which comprises the current collecting plate and an end plate, wherein a groove for accommodating the current collecting plate is formed in one side of the end plate, facing a galvanic pile assembly, a plurality of first bosses and first flow channels are sequentially arranged on the bottom surface of the groove at intervals, the first side surface of the current collecting plate contacts with the bottom surface of the groove, the second side surface of the current collecting plate faces the galvanic pile assembly, a plurality of second bosses and second flow channels are sequentially arranged on the first side surface of the current collecting plate at intervals, and the second flow channels are alternately arranged and communicated with the first flow channels; wherein, the two end openings of the first flow channels extend to the two opposite side edges of the end plate and are communicated with the outside air, and/or the two end openings of the second flow channels extend to the two opposite side edges of the current collecting plate and are communicated with the outside air.
The working principle of the invention is as follows: after the fuel cell stack is packaged, the current collecting plate is arranged between the end plate and the electric stack component and is contacted with the groove of the end plate, the first flow channel and the second flow channel form a cooling cavity communicated with each other for air circulation, and because the fuel cell stack is generally arranged in an environment with circulating air, circulating air can be formed in the moving process of the fuel cell stack along with a vehicle, the circulating air can enter the cooling cavity through one end opening of the first flow channel and/or the second flow channel, and the cooling air is diffused to each first flow channel and each second flow channel, so that the first side surface of the current collecting plate is forcedly cooled, and then the cooled air flows out from the other end opening of the first flow channel and/or the second flow channel.
The invention can take away the heat generated by the current collecting plate because of conducting the current of the electric pile through the continuous cooling function of ventilation air, and realize the protection of the current collecting plate, the unipolar plates positioned at the two ends of the electric pile assembly and the like. The heat dissipation structure of the current collecting plate can timely and effectively dissipate heat of the current collecting plate, and meets the requirement of higher and higher volume power density of the fuel cell stack.
The invention also provides a fuel cell stack which comprises a stack assembly and the current collecting plate heat dissipation structure. The deduction process of the beneficial effects generated by the fuel cell stack is generally similar to that of the beneficial effects brought by the heat dissipation structure of the current collecting plate, so that the description is omitted herein.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is an exploded view of a heat dissipating structure of a current collector according to an embodiment of the present invention;
FIG. 2 is a schematic view of an end plate according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a current collecting plate according to an embodiment of the present invention;
fig. 4 is a schematic view of a fuel cell stack according to an embodiment of the present invention.
The meaning of the individual reference numerals in fig. 1 to 4 is as follows:
the device comprises a 1-end plate, a 2-collecting plate, a 3-groove, a 4-galvanic pile component, a 11-first runner, a 12-first boss, a 13-hydrogen inlet, a 14-hydrogen outlet, a 15-air inlet, a 16-air outlet, a 17-cooling liquid inlet, a 18-cooling liquid outlet, a 21-second runner, a 22-second boss and a 23-output terminal.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 to 4, fig. 1 is an exploded view of a heat dissipating structure of a current collecting plate according to an embodiment of the invention; FIG. 2 is a schematic view of an end plate according to an embodiment of the present invention; fig. 3 is a schematic structural view of a current collecting plate according to an embodiment of the present invention; fig. 4 is a schematic view of a fuel cell stack according to an embodiment of the present invention.
The invention provides a current collecting plate heat dissipation structure, which comprises a current collecting plate 2 and an end plate 1, wherein one side of the end plate 1 facing a galvanic pile assembly 4 is provided with a groove 3 for accommodating the current collecting plate 2, the bottom surface of the groove 3 is provided with a plurality of first bosses 12 and first flow channels 11 which are sequentially arranged at intervals, the first side surface of the current collecting plate 2 contacts with the bottom surface of the groove 3, the second side surface of the current collecting plate 2 faces the galvanic pile assembly 4, the first side surface of the current collecting plate 2 is provided with a plurality of second bosses 22 and second flow channels 21 which are sequentially arranged at intervals, the second flow channels 21 are crossed and communicated with the first flow channels 11, namely, the second flow channels 21 and the first flow channels 11 can be vertically crossed and communicated, and can also be crossed and communicated at an acute angle;
wherein the plurality of first flow channels 11 have both end openings extending to opposite side edges of the end plate 1 and communicating with the outside air, and/or the plurality of second flow channels 21 have both end openings extending to opposite side edges of the current collecting plate 2 and communicating with the outside air.
Referring to fig. 1 to 4, end plates 1 are provided at both ends of a fuel cell stack for transmitting a required pressing force to stacked cell stack assemblies 4. The end plate 1 is also provided with a hydrogen inlet 13, a hydrogen outlet 14, an air inlet 15, an air outlet 16, a cooling liquid inlet 17 and a cooling liquid outlet 18, and the length a and the width b of the groove 3 arranged on the end plate 1 respectively correspond to the boundary of the active area of the galvanic pile. The current collecting plate 2 is further provided with an output terminal 23.
The working principle of the invention is as follows: after the fuel cell stack is packaged, the current collecting plate 2 is installed between the end plate 1 and the stack assembly 4 and contacts with the groove 3 of the end plate 1, the first flow channel 11 and the second flow channel 21 form a cooling cavity communicated with each other for air circulation, and because the fuel cell stack is installed in an environment with circulating air, circulating air can be formed during the movement of the fuel cell stack along with a vehicle, the circulating air can enter the cooling cavity through one end opening of the first flow channel 11 and/or the second flow channel 21, and the cooling air is diffused to each first flow channel 11 and the second flow channel 21 again, so that the first side surface of the current collecting plate 2 is forcedly cooled, and then the cooled air flows out from the other end opening of the first flow channel 11 and/or the second flow channel 21.
The invention can take away the heat generated by the current collecting plate 2 because of conducting the pile current through the continuous cooling effect of ventilation air, and realize the protection of the current collecting plate 2, the unipolar plates positioned at the two ends of the pile assembly 4 and the like. The heat dissipation structure of the current collecting plate can timely and effectively dissipate heat of the current collecting plate 2, and meets the requirement of higher and higher volume power density of the fuel cell stack.
It should be noted that, the present invention may specifically design the arrangement area of the first flow channels 11 and the second flow channels 21 according to the heat generating condition of the current collecting plate 2, that is, the cooling cavity formed by the first flow channels 11 and the second flow channels 21 may correspond to the entire surface or a partial surface of the first side surface of the current collecting plate 2. In general, the central area of the current collecting plate 2 generates heat seriously, and in order to effectively dissipate heat in the central area of the current collecting plate 2, preferably, the cooling cavity corresponds to the central portion of the first side surface of the current collecting plate 2, specifically, in the arrangement direction of the first flow channels 11, each first flow channel 11 is sequentially arranged from the central portion of the bottom surface of the groove 3 to two ends in the arrangement direction; and/or, in the arrangement direction of the second flow channels 21, each second flow channel 21 is arranged in sequence from the central portion of the first side surface of the current collecting plate 2 to both ends in the arrangement direction.
The central area of the current collecting plate 2 is subjected to the heat preservation effect of the plastic end plate or the insulating plate, the heat dissipation state is poorer, and the heat dissipation capacity of the part of the current collecting plate 2 which is far away from the central area is lower. In order to further improve the heat radiation efficiency of the central region of the current collecting plate 2, it is preferable that the pitch of each adjacent first flow passage 11 increases in the arrangement direction of the first flow passages 11 in order from the center to both ends in the arrangement direction; and/or, in the arrangement direction of the second flow passages 21, the pitch of each adjacent second flow passage 21 increases sequentially from the center to both ends in the arrangement direction. The arrangement is such that the first flow channels 11 and/or the second flow channels 21 in the central region of the collector plate 2 are more densely distributed than in the region remote from the center, so that more cooling air is forced to cool the central region.
In order to realize the distribution design of the first flow channel 11 and/or the second flow channel 21 with different densities, the invention can be realized by designing flow channels with different widths or boss structures with different widths. Preferably, in the arrangement direction of the first flow passages 11, the width of each first flow passage 11 is equal, and the width of the first boss 12 between each adjacent two first flow passages 11 increases in sequence from the center to both ends in the arrangement direction;
and/or, in the arrangement direction of the second flow channels 21, the widths of the second flow channels 21 are equal, and the widths of the second bosses 22 between every two adjacent second flow channels 21 are sequentially increased from the center to the two ends in the arrangement direction.
It is further preferred that the widths of adjacent first bosses 12 differ by 0.2 to 0.5mm and/or that the widths of adjacent second bosses 22 differ by 0.2 to 0.5mm. Referring to fig. 2 and 3, the arrangement direction of each first flow channel 11 (or first boss 12) is the width direction of the end plate 1, the width of the end plate 1 is b, the length of each first flow channel 11 (or first boss 12) is a, the widths of each first flow channel 11 are equal, and the widths b1 and b2 of two adjacent first bosses 12 differ by 0.2-0.5 mm, i.e., b 2-b1= (0.2-0.5) mm. The arrangement direction of each second flow channel 21 (or second boss 22) is the length direction of the current collecting plate 2, the length of the current collecting plate 2 is a, the length of each second flow channel 21 (or second boss 22) is b, the width of each second flow channel 21 is equal, and the widths a1 and a2 of two adjacent second bosses 22 are different by 0.2-0.5 mm, namely a 2-a1= (0.2-0.5) mm. By changing the distance between the first flow channels 11 and/or the second flow channels 21, the heat dissipation of the current collecting plate 2 can be ensured to be uniform, and the output performance of the electric pile can be improved.
In order to further expand the heat dissipation area of the cooling cavity, it is preferable that each first flow channel 11 is distributed from the center portion of the bottom surface of the groove 3 to the opposite side edges (the opposite side edges in the width or length direction) of the end plate 1 in the arrangement direction of the first flow channels 11; and/or, in the arrangement direction of the second flow channels 21, each second flow channel 21 is distributed from the center portion of the first side surface of the current collecting plate 2 to the opposite side edges (opposite side edges in the length or width direction) of the current collecting plate 2. Further preferably, in order to facilitate the processing of the first flow channels 11 and the second flow channels 21, each first flow channel 11 is arranged in sequence along the width direction of the end plate 1 and/or each second flow channel 21 is arranged in sequence along the length direction of the current collecting plate 2. As shown in fig. 2 and 3, each first flow passage 11 is distributed from the center portion of the bottom surface of the groove 3 to the opposite side edges in the width direction of the end plate 1; each of the second flow channels 21 is distributed from the center portion of the first side surface of the current collecting plate 2 to the opposite side edges of the current collecting plate 2 in the length direction. By this arrangement, the plurality of first flow passages 11 can be arranged to fill the bottom surface of the recess 3, and the plurality of second flow passages 21 can be arranged to fill the first side surface of the current collecting plate 2, so that the entire first side surface of the current collecting plate 2 can be efficiently cooled. In addition, the first bosses 12 and the first flow passages 11 extend along the length direction of the end plate 1, so that the end plate 1 can obtain sufficient rigidity in the length direction, ensuring uniform transmission of the packing force F.
It should be noted that, in this embodiment, the first flow channel 11 and the second flow channel 21 may be designed as a linear flow channel or a curved flow channel, and for convenience of processing, it is preferable that the first flow channel 11 and/or the second flow channel 21 be a linear flow channel. It is further preferred that the respective first flow channels 11 are arranged in parallel and/or that the respective second flow channels 21 are arranged in parallel.
Preferably, the end opening of the first flow passage 11 communicating with the outside air and/or the end opening of the second flow passage 21 communicating with the outside air is in a guide opening structure having a gradually decreasing width from outside to inside, i.e., the guide opening structure is formed like a bell-mouth structure, so that the flow area through which the air flows in the central region after entering the flow passage from the guide opening structure is decreased, the flow velocity is increased, and the convective heat transfer coefficient is increased, thereby improving the cooling effect of the central region of the collecting plate 2.
Preferably, as shown in fig. 3, the end opening of the second flow passage 21 communicates with the outside air, and the opening angle θ of the guide opening structure thereof is preferably designed to be 0.8 ° to 1.5 °.
Preferably, as shown in fig. 4, the thickness D of the current collecting plate 2 is equal to or greater than the depth H of the groove 3, and further, the thickness D of the current collecting plate 2 is different from the depth H of the groove 3 by 0 to 0.2mm, that is, D-h= (0 to 0.2) mm. So set up, current collector 2 when installing between end plate 1 and pile subassembly 4, current collector 2 corresponds the assembly in recess 3, current collector 2's first side surface and the bottom surface contact of recess 3 (i.e. first boss 12 and second boss 22 contact), be used for transmitting pile's encapsulation power F, current collector 2's second side surface then directly contacts with pile subassembly 4, thereby make end plate 1 face pile subassembly 4 one side and pile subassembly 4 between form the clearance, not only can guarantee current collector 2 and pile subassembly 4 complete contact, and can improve the stress on the pile subassembly 4 moreover, reduce stress concentration, improve pile subassembly 4's factor of safety. After the stack is packaged, the packaging force F can be transmitted to the boss of the current collecting plate 2 through the boss of the end plate 1, and then transmitted to the stack assembly 4, thereby realizing effective packaging.
The heat dissipation structure of the current collecting plate has simple structural characteristics, is installed by utilizing the packaging force of the fuel cell stack, is particularly suitable for the application scene of increasing the current caused by the increasing requirements of markets and customers on the volume power density of the fuel cell stack, and improves the reliability of the fuel cell stack by effectively taking away the heat generated and accumulated on the current collecting plate through timely forced convection heat exchange.
The invention also provides a fuel cell stack which comprises a stack assembly and the current collecting plate heat dissipation structure. The deduction process of the beneficial effects generated by the fuel cell stack is generally similar to that of the beneficial effects brought by the heat dissipation structure of the current collecting plate, so that the description is omitted herein.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (14)

1. The utility model provides a current collecting plate heat radiation structure which is characterized in that, including current collecting plate and end plate, the end plate is equipped with the recess that is used for holding current collecting plate towards one side of pile subassembly, the bottom surface of recess is equipped with many first bosss and first runner that the interval was arranged in proper order, the first side surface of current collecting plate contacts the bottom surface of recess, the second side surface of current collecting plate is towards pile subassembly, the first side surface of current collecting plate is equipped with many second bosss and second runner that the interval was arranged in proper order, the second runner with the first runner alternately arranges and communicates;
wherein, the two end openings of the first flow channels extend to the two opposite side edges of the end plate and are communicated with the outside air, and/or the two end openings of the second flow channels extend to the two opposite side edges of the current collecting plate and are communicated with the outside air.
2. The heat dissipating structure of a collector plate of claim 1 wherein in the direction of arrangement of said first flow channels, each of said first flow channels is arranged in sequence from the center portion of the bottom surface of said recess toward both ends in the direction of arrangement;
and/or, in the arrangement direction of the second flow channels, each second flow channel is sequentially arranged from the central part of the first side surface of the current collecting plate to two ends in the arrangement direction.
3. The collector plate heat dissipating structure of claim 2 wherein in the direction of arrangement of said first flow channels, the spacing between adjacent ones of said first flow channels increases in sequence from the center to both ends in the direction of arrangement;
and/or in the arrangement direction of the second flow channels, the distance between every two adjacent second flow channels is sequentially increased from the center to two ends of the arrangement direction.
4. The current collecting plate heat dissipating structure according to claim 3, wherein in the arrangement direction of the first flow channels, the width of each first flow channel is equal, and the width of the first boss between each two adjacent first flow channels increases in order from the center to both ends in the arrangement direction;
and/or in the arrangement direction of the second flow channels, the widths of the second flow channels are equal, and the widths of the second bosses between every two adjacent second flow channels are sequentially increased from the center to two ends of the arrangement direction.
5. The header plate heat dissipating structure of claim 4, wherein the widths of adjacent ones of said first bosses differ by 0.2 to 0.5mm and/or the widths of adjacent ones of said second bosses differ by 0.2 to 0.5mm.
6. The header plate heat dissipating structure of claim 2, wherein each of said first flow channels is distributed from a center portion of a bottom surface of said recess to opposite side edges of said end plate in an arrangement direction of said first flow channels;
and/or, in the arrangement direction of the second flow channels, each second flow channel is distributed from the central part of the first side surface of the current collecting plate to the two opposite side edges of the current collecting plate.
7. The header plate heat dissipating structure of claim 4, wherein each of said first flow channels is arranged in sequence along a width direction of said header plate and/or each of said second flow channels is arranged in sequence along a length direction of said header plate.
8. The header plate heat dissipating structure of claim 1, wherein the first flow channel and/or the second flow channel is a linear flow channel.
9. The header plate heat dissipating structure of claim 8, wherein each of said first flow channels is arranged in parallel and/or each of said second flow channels is arranged in parallel.
10. The header plate heat dissipating structure of claim 1, wherein the end opening of said first flow passage communicating with the outside air and/or the end opening of said second flow passage communicating with the outside air is in a guide opening structure having a gradually decreasing width from outside to inside.
11. The header plate heat dissipating structure of claim 10, wherein the opening angle of said guide opening structure is 0.8 ° to 1.5 °.
12. The current collecting plate heat dissipating structure according to any one of claims 1 to 11, wherein a thickness of the current collecting plate is equal to or greater than a depth of the recess.
13. The header plate heat dissipating structure of claim 12, wherein the thickness of said header plate differs from the depth of said recess by 0 to 0.2mm.
14. A fuel cell stack comprising a stack assembly, further comprising the collector plate heat dissipating structure of any one of claims 1 to 13.
CN202111209665.XA 2021-10-18 2021-10-18 Current collecting plate heat dissipation structure and fuel cell stack Active CN113948741B (en)

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CN113948741B true CN113948741B (en) 2023-05-23

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Citations (2)

* Cited by examiner, † Cited by third party
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