CN114649539B - Fuel cell stack and end plate for fuel cell stack - Google Patents
Fuel cell stack and end plate for fuel cell stack Download PDFInfo
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- CN114649539B CN114649539B CN202011523428.6A CN202011523428A CN114649539B CN 114649539 B CN114649539 B CN 114649539B CN 202011523428 A CN202011523428 A CN 202011523428A CN 114649539 B CN114649539 B CN 114649539B
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- end plate
- force
- fuel cell
- pressure
- cell stack
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
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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
- H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
- H01M8/2465—Details of groupings of fuel cells
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- 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 provides a fuel cell stack and an end plate for the fuel cell stack, wherein the fuel cell stack comprises a group of fuel cell units, a first end plate and a second end plate, the fuel cell units are arranged between the first end plate and the second end plate, and the fuel cell units are sequentially stacked together, wherein the first end plate comprises an end plate main body and a force transmission medium, the end plate main body forms a fluid cavity and a force application surface, the force transmission medium is contained in the fluid cavity, the force application surface of the end plate main body is pressed against the fuel cell units, and the force transmission medium is fluid.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a fuel cell stack. The invention still further relates to an end plate for a fuel cell stack.
Background
Fuel cells can convert chemical energy in a fuel directly into electrical energy through an electrochemical reaction. However, a single fuel cell (or fuel cell) can provide a lower voltage and lower output power. In practical applications, a plurality of fuel cell cells are generally stacked together to form a fuel cell stack (or fuel cell stack) capable of providing high voltage and high power. Accordingly, in order to ensure a stable structure of the stack-formed fuel cell stack, it is necessary to keep the fuel cell cells stacked together by the end plates thereof.
The end plates of the conventional fuel cell stack are integrally formed of a rigid material, and the fuel cell stack is fastened by a fastening mechanism provided in the end plate. For example, by screwing or strapping, a predetermined pressure is applied to the end plates, and a force is applied to the fuel cell cells between the two end plates via the end plates, thereby ensuring that the fuel cell cells are stacked between the two end plates. However, in the conventional fastening method of the fuel cell, whether the fuel cell is screwed or bundled by the band, a predetermined pressure is applied to a part of the end plate (a part fastened by the screwing device or the band), and the force is transmitted to the fuel cell between the two end plates through the end plates, so that the predetermined pressures are different at different parts of the end plates. Accordingly, the stress on different parts of the fuel cell unit of the fuel cell stack is not uniform, the preset pressure transmitted to the fuel cell unit is larger near the screw (or nut) or the strap area, and the preset pressure transmitted to the fuel cell unit is smaller far from the screw (or nut) or the strap area. In addition, the preset pressure exerted on the end plate by different screws (or nuts) or belts is also different, which results in that different stressed parts of the end plate are also subjected to different preset pressures due to different fastening degrees of the fastening mechanisms, for example, different fastening degrees of the screws or belts. The uneven distribution of the preset pressure applied to the fuel cell unit by the end plate of the fuel cell stack will result in uneven pressure distribution inside the fuel cell stack. The uneven distribution of the internal pressure of the fuel cell stack not only affects the sealing performance between the flow field plate and the membrane electrode of the fuel cell stack, but also affects the electrochemical reaction capability of the fuel cell stack. In addition, the uneven distribution of the pressure inside the fuel cell stack may also affect the structural stability of the fuel cell stack. And if serious, may even cause deformation and damage to the flow field plates of the fuel cell cells.
The problem of uneven distribution inside the fuel cell caused by fixing the fuel cell stack through the solid end plate of the fuel cell stack is one of the problems which are focused and addressed in the whole fuel cell industry. In order to solve the above problems, various technical solutions have been proposed and tried. For example, the thickness of the end plates is increased to make the force transmission by the end plates more uniform; increasing the number of the screwing devices or the bridles so as to increase the uniformity degree of the preset pressure distribution; the stress side of the end plate is designed to be arched and the like. However, the above-described technical solution increases the degree of uniformity of the preset pressure transmission, and also increases the mechanical complexity of the fastening mechanism or the end plate, and even increases the weight and volume of the entire fuel cell stack. In addition, due to the limitation of the characteristics of the solid material, after the local force is transmitted through the solid, the preset pressure cannot be really uniformly distributed, and the problem cannot be fundamentally solved by the scheme.
Chinese patent application No. CN201920840014.2 discloses a fuel cell stack, wherein a strapping tape is used to fix an anode end plate, a cathode end plate and a cell unit, and two ends of the strapping tape are provided with screws penetrating through the other end plate, the penetrating parts of the screws are provided with nuts matched with each other, the part of the screws between the nuts and the end plates is sleeved with a spring, and the spring plays a role in buffering the micro deformation generated in the operation process of the fuel cell. However, the preset pressure of the strapping tape of the fuel cell stack disclosed in the invention still needs to be transmitted to the fuel cell unit through the two solid end plates, and the spring provides elasticity, and at the same time, the whole fuel cell stack is easily disturbed by the outside, so that the fastening action of the strapping tape to the fuel cell stack is unstable. Finally, the fastening mode of combining the strapping tape, the screw and the spring of the fuel cell stack disclosed by the invention cannot fundamentally solve the problem of uneven internal pressure of the fuel cell stack.
Disclosure of Invention
The main advantage of the present invention is to provide a fuel cell stack, wherein the end plate of the fuel cell stack of the present invention can uniformly transmit the preset pressure to the fuel cell units of the fuel cell stack.
Another advantage of the present invention is to provide a fuel cell stack, wherein the force transmission medium of the end plate of the fuel cell stack of the present invention can uniformly transmit the preset pressure applied thereto to the end plate body of the end plate, so that the end plate body of the end plate can uniformly apply the preset pressure to the fuel cells of the fuel cell stack.
Another advantage of the present invention is to provide an end plate for a fuel cell stack, in which the end plate for a fuel cell stack of the present invention can uniformly transmit a predetermined amount of pressure to fuel cells of the fuel cell stack.
Another advantage of the present invention is to provide an end plate for a fuel cell stack, wherein the force transmission medium of the present invention for an end plate of a fuel cell stack can uniformly transmit a preset pressure applied thereto to an end plate body of the end plate, so that the end plate body of the end plate can uniformly apply the preset pressure to fuel cells of the fuel cell stack. Accordingly, the force application surface of the end plate body of the end plate is adapted to press against the fuel cell cells of the fuel cell stack.
Accordingly, in accordance with the present invention, a fuel cell stack of the present invention having at least one of the foregoing advantages includes:
a group of fuel cell units;
a first end plate; and
the fuel cell unit is arranged between the first end plate and the second end plate, and the fuel cell units are sequentially stacked together, wherein the first end plate comprises an end plate main body and a force transmission medium, the end plate main body forms a fluid cavity and a force application surface, the force transmission medium is contained in the fluid cavity, the force application surface of the end plate main body is pressed against the fuel cell unit, and the force transmission medium is fluid.
In accordance with another aspect of the present invention, the present invention further provides an end plate for a fuel cell stack, comprising:
an end plate main body; and
a force transfer medium, wherein the endplate body defines a fluid cavity and a force application surface, the force transfer medium being contained within the fluid cavity, wherein the force transfer medium is a fluid.
Further, the end plate body includes a body portion and a base portion extending from the body portion, wherein the base portion forms the force application surface and the body portion forms the fluid chamber. Preferably, the base portion is plate-shaped, and the base portion and the main body portion are integrally formed.
Further, this fluid cavity of this end plate main part has a bottom surface, and wherein this bottom surface of this fluid cavity is opposite with this application of force face of this end plate main part's orientation, and this bottom surface of this fluid cavity and this application of force face of this end plate main part are the plane to this end plate main part will predetermine pressure uniform transfer and give the fuel cell monomer of this fuel cell stack.
Further, the end plate for a fuel cell stack of the present invention comprises a force receiving member, wherein the force receiving member is disposed in the fluid chamber, and the force transmission medium is disposed between the force receiving member and the end plate body, wherein the force receiving member is disposed to be movable relative to the end plate body, so that a predetermined pressure applied to the force receiving member toward the end plate body can be transmitted to the force transmission medium by the force receiving member. Preferably, the force receiving member is arranged to be capable of reciprocating relative to the end plate body.
Preferably, the force transmission medium forms a force-bearing face, and the force-bearing face of the force transmission medium faces in an opposite direction to the force-applying face of the endplate body. Accordingly, the preset pressure is transmitted by the force receiving part and acts on the force receiving surface of the force transmission medium. More preferably, the force-bearing surface of the force-transmitting medium is planar. Most preferably, the force transfer medium is sealed within the fluid chamber.
Optionally, the force transfer medium is a compressed gas sealed within the fluid cavity of the endplate body. Accordingly, the pressure of the force transmission medium acting on the bottom surface of the fluid chamber of the end plate body is applied to the fuel cell cells of the fuel cell stack through the force application surface of the end plate body.
Optionally, the end plate for a fuel cell stack of the present invention further comprises a cover plate and a set of force-receiving members, wherein the force-transmitting medium and the cover plate are both contained in the fluid chamber, and the force-transmitting medium is disposed between the end plate main body and the cover plate, wherein the cover plate forms a set of through holes, wherein the through holes communicate with the fluid chamber of the end plate main body, and the force-receiving members are respectively disposed in the through holes, wherein the force-receiving members are disposed to be movable relative to the end plate main body, so that a predetermined pressure applied to the force-receiving members toward the end plate main body can be transmitted to the force-transmitting medium by the force-receiving members. Preferably, the force receiving member is arranged to be capable of reciprocating relative to the endplate body. More preferably, the cover plate is integrally formed with the end plate main body.
The above and other advantages of the invention will be more fully apparent from the following description and drawings.
The above and other advantages and features of the present invention will be more fully apparent from the following detailed description of the invention, the accompanying drawings and the claims.
Drawings
Fig. 1 is a perspective view of a fuel cell stack according to an embodiment of the present invention.
Fig. 2 is a perspective view of an end plate of the fuel cell stack according to the embodiment of the present invention described above.
Fig. 3 is an assembly view of the end plate of the fuel cell stack of the embodiment of the present invention described above.
Fig. 4 is a sectional view of the end plate of the fuel cell stack according to the embodiment of the present invention described above.
Fig. 5 is a perspective view of the force-receiving members of the end plates of the fuel cell stack according to the embodiment of the present invention described above.
Fig. 6 is a perspective view of an end plate main body of the end plate of the fuel cell stack according to the embodiment of the invention described above.
Fig. 7 is a perspective view of the base portion of the end plate body of the end plate of the fuel cell stack according to the embodiment of the invention described above, in which the figure shows the force application surface of the end plate body.
Figure 8 shows an alternative implementation of the end plate of a fuel cell stack according to an embodiment of the invention described above.
Figure 9 is a cross-sectional view of an alternative implementation of the end plate of the fuel cell stack according to an embodiment of the invention described above.
Detailed Description
The following description is provided to enable any person skilled in the art to practice the invention. Other obvious substitutions, modifications and variations will occur to those skilled in the art. Accordingly, the scope of protection of the invention should not be limited by the exemplary embodiments described herein.
It will be understood by those of ordinary skill in the art that, unless specifically indicated herein, the terms "a" and "an" should be interpreted as meaning that "at least one" or "one or more" may mean that, in one embodiment, one element may be present in one number, and in another embodiment, the element may be present in multiple numbers.
It will be understood by those of ordinary skill in the art that unless otherwise specified herein, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positions illustrated in the drawings for convenience in describing the invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation or position. Accordingly, the above terms should not be construed as limiting the present invention.
Referring to fig. 1 to 7 of the drawings, a fuel cell stack according to an embodiment of the present invention is illustrated, wherein the fuel cell stack includes a first end plate 10, a set of fuel cells 20, and a second end plate 30, wherein the fuel cells 20 are disposed between the first end plate 10 and the second end plate 30, and the fuel cells 20 are stacked in sequence, wherein the first end plate 10 includes an end plate body 11 and a force transmission medium 12, wherein the end plate body 11 forms a fluid chamber 1101 and a force application surface 1102, the force transmission medium 12 is accommodated in the fluid chamber 1101, wherein the force application surface 1102 of the end plate body 11 presses against the fuel cells 20, and the force transmission medium 12 is a fluid. Accordingly, the fuel cell unit 20 is stacked between the force application surface 1102 of the first end plate 10 and the second end plate 30. It will be appreciated that the predetermined pressure may be provided by a fastening mechanism provided in the fuel cell stack of the present invention, such as a screw device, a tie strap, etc., or may be a pressure applied to the first end plate 10 in other manners. It is understood that the force transmission medium 12 is a fluid so that it can transmit a predetermined pressure applied to the force transmission medium 12 toward the end plate body 11 to the end plate body 11 with a uniform magnitude, thereby enabling the end plate body 11 to maintain the structural stability of the fuel cell stack of the present invention by the predetermined pressure. Therefore, the fuel cell stack can avoid the problem of uneven distribution of the preset pressure applied to the fuel cell monomer by the end plate of the existing fuel cell stack, thereby causing uneven distribution of the internal pressure of the fuel cell stack. The force transmission medium 12 is preferably a liquid and the force application surface 1102 of the endplate body 11 is preferably a flat surface. Preferably, the force transfer medium 12 is sealed within the fluid chamber 1101. It will be appreciated by those skilled in the art that the second end plate 30 may be an end plate for a fuel cell stack of the present invention or may be an integral end plate made of a rigid material.
It is noted that the operating environment temperature of the fuel cell (or fuel cell stack) varies widely (-50 ℃ to 120 ℃). In order to ensure that the force transmission medium 12 of the first end plate 10 of the fuel cell stack of the present invention can stably transmit a predetermined pressure in both a low temperature environment and a high temperature environment, the force transmission medium 12 should be in a fluid state in a temperature range of-50 ℃ to 120 ℃. Preferably, the force transfer medium 12 is liquid at a temperature in the range of-40 ℃ to 80 ℃. In addition, the force transmission medium 12 may expand with heat and contract with cold due to changes in ambient temperature, thereby affecting the pressure transmission. For example, in a low temperature environment, the force transmission medium 12 becomes small in volume, resulting in a decrease in force transmission performance for a preset pressure. In a high-temperature environment, the volume of the force transmission medium 12 becomes large, causing the volume of the force transmission medium 12 to become large, and applying an additional force to the end plate main body 11 causes the pressure inside the fuel cell stack to become large. Therefore, the force transmission medium 12 is preferably a substance having a small thermal expansion coefficient. Finally, the force transfer medium 12 should also have good thermal stability and not undergo chemical reactions, such as degradation or decomposition, due to elevated temperatures.
As shown in fig. 4 to 7 of the drawings, the first end plate 10 of the fuel cell stack according to the embodiment of the invention further includes a force-receiving member 13, wherein the force-receiving member 13 is disposed in the fluid chamber 1101, the force-transmitting medium 12 is sealed between the force-receiving member 13 and the end plate main body 11, and the force-receiving member 13 is disposed to press against the force-transmitting medium 12, wherein the force-receiving member 13 is disposed to be capable of moving relative to the end plate main body 11, so that a predetermined pressure applied to the force-receiving member 13 toward the end plate main body 11 can be transmitted to the force-transmitting medium 12 by the force-receiving member 13 and further transmitted to the end plate main body 11 of the first end plate 10 through the force-transmitting medium 12. Preferably, the force receiving member 13 is provided to be capable of reciprocating relative to the end plate main body 11.
As shown in fig. 4 to 7 of the drawings, the end plate main body 11 of the first end plate 10 of the fuel cell stack according to the embodiment of the present invention includes a main body portion 111 and a base portion 112 extending from the main body portion 111, wherein the main body portion 111 forms the fluid chamber 1101, and the base portion 112 forms the force applying surface 1102. Preferably, the base portion 112 has a plate shape, and the base portion 112 and the body portion 111 are integrally formed.
As shown in fig. 4 to 7 of the drawings, the fluid chamber 1101 of the end plate main body 11 of the first end plate 10 of the fuel cell stack according to the embodiment of the present invention has a bottom surface 1103, wherein the bottom surface 1103 of the fluid chamber 1101 is opposite to the force application surface 1102 of the end plate main body 11, and the bottom surface 1103 of the fluid chamber 1101 and the force application surface 1102 of the end plate main body 11 are both planar, so that the end plate main body 11 can uniformly transmit a predetermined pressure to the fuel cells 20 of the fuel cell stack according to the present invention.
As shown in fig. 4 to 7 of the drawings, the force transmission medium 12 of the first end plate 10 of the fuel cell stack according to the embodiment of the present invention forms a force-receiving surface 1201, and the force-receiving surface 1201 of the force transmission medium 12 faces opposite to the force-receiving surface 1102 of the end plate body 11. Accordingly, the preset pressure is transmitted by the force receiving member 13 and acts on the force receiving surface 1201 of the force transmission medium 12. Preferably, the force-bearing surface 1201 of the force transmission medium 12 is planar. Preferably, the force-receiving member 13 is arranged to press against the force-receiving surface 1201 of the force transmission medium 12.
As shown in fig. 4 to 7 of the drawings, the first end plate 10 of the fuel cell stack according to the embodiment of the present invention further includes a pressure stabilizer 15, wherein the pressure stabilizer 15 has a pressure stabilization cavity 1501 and a fluid passage 1502, wherein the fluid passage 1502 communicates with the fluid cavity 1101 and the pressure stabilization cavity 1501 respectively, so that the force transmission medium 12 can flow from the fluid cavity 1101 to the pressure stabilization cavity 1501 through the fluid passage 1502 when the force transmission medium 12 is thermally expanded; and when the force transmission medium 12 contracts upon cooling, the force transmission medium 12 in the pressure maintaining chamber 1501 may flow into the fluid chamber 1101 through the fluid passage 1502 to ensure that the preset pressure is stably transmitted to the end plate body 11.
As shown in fig. 1 to 7 of the drawings, the pressure stabilizing device 15 of the first end plate 10 of the fuel cell stack according to the embodiment of the present invention includes a pressure stabilizing tank 151, wherein the pressure stabilizing tank 151 forms the pressure stabilizing cavity 1501. It will be appreciated that the plenum 151 of the pressure stabilization device 15 of the first end plate 10 of the fuel cell stack of the present invention may be an existing liquid expansion tank, may be optimized to contain the force transfer medium 12 when expanded by heat, and other devices that allow the force transfer medium 12 to flow into the fluid chamber 1101 when contracted by cold.
As shown in fig. 4 to 7 of the drawings, the surge tank 151 of the surge tank 15 of the first end plate 10 of the fuel cell stack according to the embodiment of the present invention is preferably provided in the force receiving member 13. Preferably, the fluid passage 1502 is formed in the force receiving member 13. Alternatively, the pressure stabilizer 15 is provided in the end plate main body 11, and the fluid passage 1502 is formed in the main body portion 111 of the end plate main body 11.
It is noted that the force transmission medium 12 of the first end plate 10 of the fuel cell stack according to the embodiment of the present invention may also be a compressed gas sealed within the fluid chamber 1101 of the end plate body 11. Accordingly, the predetermined pressure applied to the bottom surface 1103 of the fluid chamber 1101 of the end plate main body 12 by the force transmission medium 12 may be provided by a fastening mechanism provided in the fuel cell stack of the present invention, or may be generated by a compressed gas itself. At this time, a user or an operator can charge the force transmission medium 12 (compressed gas) into the fluid chamber 1101, so that the force transmission medium 12 generates a pressure acting on the bottom surface 1103 of the fluid chamber 1101 of the end plate body 11, and is applied to the fuel cell unit 20 of the fuel cell stack of the present invention through the force application surface 1102 of the end plate body 11.
As shown in fig. 1 of the drawings, the fuel cell stack according to the embodiment of the present invention further includes a fastening device 40, wherein the fastening device 40 includes a plurality of binding bands 41, wherein each binding band 41 surrounds the first end plate 10, the second end plate 30 and the fuel cell 20, and both ends of each binding band 41 are fixed to the second end plate 30. Alternatively, both ends of each binding band 41 are fixed to the force receiving member 13 of the first end plate 10. Accordingly, a user or an operator can apply a predetermined pressure to the force receiving member 13 by tightening a strap, so that the predetermined pressure is transmitted to the force transmission medium 12 through the force receiving member 13, and the predetermined pressure can be transmitted to the end plate main body 11 and the fuel cell unit 20 by the force transmission medium 12 in a uniform size. It will be appreciated by those skilled in the art that the strapping band 41 of the fastening device 40 may alternatively be a threaded mechanism.
Accordingly, according to an embodiment of the present invention, the present invention further provides an end plate for a fuel cell stack, wherein the end plate for a fuel cell stack of the present invention comprises an end plate main body 11 and a force transmission medium 12, wherein the end plate main body 11 forms a fluid chamber 1101 and a force application surface 1102, the force transmission medium 12 is contained in the fluid chamber 1101, wherein the force application surface 1102 of the end plate main body 11 is configured to press against the fuel cell 20, and the force transmission medium 12 is a fluid. Preferably, the force transfer medium 12 is a liquid.
Accordingly, according to an embodiment of the present invention, the present invention further provides an end plate assembly for a fuel cell stack, wherein the end plate assembly for a fuel cell stack of the present invention includes an end plate main body 11 and a force-receiving member 13, wherein the end plate main body 11 forms a fluid chamber 1101 and a force-applying surface 1102, the force-receiving member 13 and the force transmission medium 12 are both disposed in the fluid chamber 1101, and the force transmission medium 12 is sealed between the force-receiving member 13 and the end plate main body 11, wherein the force-receiving member 13 is disposed to be movable relative to the end plate main body 11. Preferably, the force-receiving member 13 is arranged to press against the force transmission medium 12, and the force-receiving member 13 is arranged to be able to move relative to the end plate body 11, so that a preset pressure applied to the force-receiving member 13 and facing the end plate body 11 can be transmitted to the force transmission medium 12 by the force-receiving member 13 and further transmitted to the end plate body 11 of the first end plate 10 through the force transmission medium 12. Preferably, the force application surface 1102 of the end plate main body 11 is provided to be adapted to press against the fuel cell 20, and the force transmission medium 12 is a fluid. More preferably, the force transmission medium 12 is a liquid.
Description figures 8 and 9 show an alternative implementation of the first end plate 10 of a fuel cell stack according to an embodiment of the present invention, in which the first end plate 10A comprises an end plate body 11, a force transmission medium 12, a set of force receiving members 13A and a cover plate 14A, wherein the end plate body 11 forms a fluid chamber 1101 and a force application surface 1102, the force transmission medium 12 and the cover plate 14A are both accommodated in the fluid chamber 1101, and the force transmission medium 12 is disposed between the end plate body 11 and the cover plate 14A, wherein the cover plate 14A forms a set of through holes 1401A, wherein the through holes 1401A are respectively in communication with the fluid chamber 1101 of the end plate body 11, the force receiving members 13A are respectively disposed in the through holes 1401A and press against the force transmission medium 12, wherein the force receiving members 13A are configured to be movable relative to the end plate body 11, so that a predetermined pressure applied to the force receiving members 13A, which is directed towards the end plate body 11, can be transmitted to the force transmission medium 12 by the force receiving members 13A. Preferably, the force receiving member 13A is provided so as to be capable of reciprocating relative to the end plate main body 11. Preferably, the cover plate 14A is fixed to the end plate body 11 by welding. Preferably, the cover plate 14A is integrally formed with the end plate body 11, so that the cover plate 14A, the end plate body 11 and the force receiving member 13A seal the force transmission medium 12 in the fluid chamber 1101. Preferably, the force transmission medium 12 is a liquid.
As shown in fig. 8 and 9, the through holes 1401A of the cover plate 14A of the first end plate 10A of the fuel cell stack according to the embodiment of the present invention are spaced apart from each other in the cover plate 14A, wherein the through holes 1401A are formed in two parallel arrangements so that the fastening means of the first end plate 10A applies a predetermined pressure to the force receiving member 13A. For example, when a user applies a preset pressure by the binding band, the preset pressure may be simultaneously applied to the corresponding two force receiving members 13A by the binding band, so that the corresponding two force receiving members 13A are simultaneously moved. Accordingly, the through holes 1401A of the cover 14A are formed in N (N is 1 or more) arrays, and when a user applies a predetermined pressure by the binding tape, the predetermined pressure can be applied to N of the force receiving members 13A at the same time by the binding tape. In this case, the number of the binding tapes required by the user is related to the number of rows of the through holes 1401A. Except for the differences described above, the first end plate 10A and the first end plate 10 have substantially the same structure.
Accordingly, according to an embodiment of the present invention, the present invention further provides another end plate assembly for a fuel cell stack, which includes an end plate main body 11, a set of force receiving members 13A and a cover plate 14A, wherein the end plate main body 11 forms a fluid chamber 1101 and a force applying surface 1102, the force transmission medium 12 and the cover plate 14A are both accommodated in the fluid chamber 1101, and the force transmission medium 12 is disposed between the end plate main body 11 and the cover plate 14A, wherein the cover plate 14A forms a set of through holes 1401A, wherein the through holes 1401A are respectively communicated with the fluid chamber 1101 of the end plate main body 11, the force receiving members 13A are respectively disposed in the through holes 1401A and press against the force transmission medium 12, wherein the force receiving members 13A are configured to be movable relative to the end plate main body 11, so that a predetermined pressure applied to the force receiving members 13A and facing the end plate main body 11 can be transmitted to the force transmission medium 12 by the force receiving members 13A. Preferably, the force receiving member 13A is provided so as to be capable of reciprocating relative to the end plate main body 11.
It will be understood by those of ordinary skill in the art that the embodiments described above and shown in the drawings are merely for illustrative purposes and are not intended to limit the present invention. All equivalent implementations, modifications and improvements that are within the spirit of the invention are intended to be included within the scope of the invention.
Claims (21)
1. A fuel cell stack, comprising:
a group of fuel cell units;
a first end plate; and
the first end plate comprises an end plate main body, a force receiving part and a force transmission medium, wherein the end plate main body forms a fluid cavity and a force application surface, the force transmission medium is contained in the fluid cavity, the force receiving part is arranged in the fluid cavity, the force transmission medium is sealed between the force receiving part and the end plate main body, the force receiving part is arranged to be pressed against the force transmission medium, the force transmission medium is fluid, the force receiving part can move back and forth relative to the end plate main body, and the force application surface of the end plate main body is arranged to be suitable for the fuel cell unit, so that the force applied to the force receiving part by different fastening mechanisms of the fuel cell stack can be uniformly transmitted to the end plate main body of the first end plate and the fuel cell unit through the size of the end plate main body of the first end plate.
2. The fuel cell stack of claim 1, wherein the fluid chamber of the end plate body has a bottom surface, wherein the bottom surface of the fluid chamber is opposite to the force application surface of the end plate body, and wherein the bottom surface of the fluid chamber and the force application surface of the end plate body are both planar.
3. The fuel cell stack of claim 1, wherein the first end plate further comprises a pressure stabilizer, wherein the pressure stabilizer has a pressure stabilization cavity and a fluid passage, wherein the fluid passage communicates with the fluid cavity and the pressure stabilization cavity, respectively.
4. A fuel cell stack according to claim 3, wherein the pressure-stabilizing means comprises a pressure-stabilizing tank, wherein the pressure-stabilizing tank forms the pressure-stabilizing chamber, and wherein the pressure-stabilizing tank is a liquid expansion tank.
5. The fuel cell stack of claim 1, wherein the first end plate further comprises a set of force receiving members and a cover plate, wherein the force transmitting medium and the cover plate are both contained within the fluid chamber and the force transmitting medium is disposed between the end plate body and the cover plate, wherein the cover plate forms a set of through holes, wherein the through holes are respectively in communication with the fluid chamber of the end plate body, the force receiving members are respectively disposed within the through holes and press against the force transmitting medium, wherein the force receiving members are disposed to be movable relative to the end plate body.
6. The fuel cell stack of claim 5, wherein the fluid chamber of the end plate body has a bottom surface, wherein the bottom surface of the fluid chamber and the force application surface of the end plate body are oppositely oriented, and wherein the bottom surface of the fluid chamber and the force application surface of the end plate body are both planar.
7. The fuel cell stack of claim 5, wherein the first end plate further comprises a pressure stabilizer, wherein the pressure stabilizer has a pressure stabilization cavity and a fluid passage, wherein the fluid passage communicates with the fluid cavity and the pressure stabilization cavity, respectively.
8. The fuel cell stack of claim 7, wherein the pressure stabilization device comprises a pressure stabilization tank, wherein the pressure stabilization tank forms the pressure stabilization cavity, and wherein the pressure stabilization tank is a liquid expansion tank.
9. The fuel cell stack according to claim 5, 6, 7 or 8, wherein the force transmission medium of the first end plate forms a force-receiving surface, and the force-receiving surface of the force transmission medium faces in an opposite direction to the force-applying surface of the end plate body, wherein the force-receiving member is arranged to press against the force-receiving surface of the force transmission medium.
10. The fuel cell stack of claim 1, 2, 3, 4, 5, 6, 7 or 8, wherein the force transfer medium is a liquid.
11. An end plate for a fuel cell stack, comprising:
a force receiving member;
an end plate main body; and
force transmission medium, wherein this end plate main part forms a fluid chamber and a application of force face, wherein this force transmission medium is held in this fluid chamber, this atress spare is set up at this fluid chamber, this force transmission medium is sealed between this atress spare and this end plate main part, this atress spare is set up to support and is pressed at this force transmission medium, this force transmission medium is the fluid, this atress spare is set up and can reciprocate relatively this end plate main part, and this application of force face of this end plate main part is set up to support and is pressed at the fuel cell monomer of this fuel cell heap, thereby make the power that different fastening device of this fuel cell heap applied to this atress spare can evenly transmit to this end plate main part and evenly transmit to this fuel cell monomer through this end plate main part size through this force transmission medium size.
12. The end plate of claim 11, wherein the fluid chamber of the end plate body has a bottom surface, wherein the bottom surface of the fluid chamber is opposite to the force application surface of the end plate body, and wherein the bottom surface of the fluid chamber and the force application surface of the end plate body are both planar.
13. The end plate of claim 11, wherein the force transmitting medium forms a force-bearing surface, and the force-bearing surface of the force transmitting medium faces in a direction opposite to the force-applying surface of the end plate body, wherein the force-bearing member is configured to press against the force-bearing surface of the force transmitting medium.
14. The end plate of claim 11, further comprising a pressure stabilizer, wherein the pressure stabilizer has a pressure stabilizing chamber and a fluid passage, wherein the fluid passage communicates with the fluid chamber and the pressure stabilizing chamber, respectively.
15. An end plate according to claim 14, wherein the pressure stabilizing means comprises a pressure stabilizing tank, wherein the pressure stabilizing tank forms the pressure stabilizing chamber, wherein the pressure stabilizing tank is a liquid expansion tank.
16. The end plate of claim 11, further comprising a plurality of force receiving members and a cover plate, wherein the force transmitting medium and the cover plate are both contained within the fluid chamber and the force transmitting medium is disposed between the end plate body and the cover plate, wherein the cover plate defines a plurality of through holes, wherein the through holes are respectively in communication with the fluid chamber of the end plate body, the force receiving members are respectively disposed within the through holes and press against the force transmitting medium, wherein the force receiving members are configured to move relative to the end plate body.
17. The end plate of claim 16, wherein the fluid chamber of the end plate body has a bottom surface, wherein the bottom surface of the fluid chamber is opposite to the force application surface of the end plate body, and wherein the bottom surface of the fluid chamber and the force application surface of the end plate body are both planar.
18. The end plate of claim 16, further comprising a pressure stabilizer, wherein the pressure stabilizer has a pressure stabilization chamber and a fluid passage, wherein the fluid passage communicates with the fluid chamber and the pressure stabilization chamber, respectively.
19. An end plate according to claim 18, wherein the pressure stabilizing means comprises a pressure stabilizing tank, wherein the pressure stabilizing tank forms the pressure stabilizing chamber, wherein the pressure stabilizing tank is a liquid expansion tank.
20. The end plate of claim 16, 17, 18 or 19, wherein the force transmission medium forms a force bearing surface and the force bearing surface of the force transmission medium faces in an opposite direction to the force application surface of the end plate body, wherein the force bearing member is arranged to press against the force bearing surface of the force transmission medium.
21. The end plate of claim 11, 12, 13, 14, 15, 16, 17, 18 or 19, wherein the force transfer medium is a liquid.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011523428.6A CN114649539B (en) | 2020-12-21 | 2020-12-21 | Fuel cell stack and end plate for fuel cell stack |
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| CN202011523428.6A CN114649539B (en) | 2020-12-21 | 2020-12-21 | Fuel cell stack and end plate for fuel cell stack |
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| CN210956861U (en) * | 2019-12-10 | 2020-07-07 | 武汉众宇动力系统科技有限公司 | Press-fitting assembly for press-fitting fuel cell stack |
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| US7261964B2 (en) * | 2004-07-29 | 2007-08-28 | General Motors Corporation | Fuel cell stack housing |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN210403917U (en) * | 2019-08-30 | 2020-04-24 | 江苏华荷氢电科技有限公司 | Fuel cell stack fixing device |
| CN210956861U (en) * | 2019-12-10 | 2020-07-07 | 武汉众宇动力系统科技有限公司 | Press-fitting assembly for press-fitting fuel cell stack |
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