CN111834644B - Solid oxide fuel cell connector structure and assembling method thereof - Google Patents
Solid oxide fuel cell connector structure and assembling method thereof Download PDFInfo
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- CN111834644B CN111834644B CN202010721968.9A CN202010721968A CN111834644B CN 111834644 B CN111834644 B CN 111834644B CN 202010721968 A CN202010721968 A CN 202010721968A CN 111834644 B CN111834644 B CN 111834644B
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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
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
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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
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Abstract
The invention relates to the technical field of fuel cells, in particular to a solid oxide fuel cell connector structure and an assembly method thereof, and the adopted technical scheme is as follows: the sealing device comprises a sealing protrusion and a stress relief groove which are arranged on a connector, wherein the stress relief groove is arranged around the outer side of the sealing protrusion; and a connecting pipe is arranged in the stress relief groove and is used for connecting a cavity defined by the air guide hole and the sealing-in bulge. The stress relief groove is arranged, so that the structural rigidity of the sealing bulge is reduced, the structural flexibility of the sealing bulge is increased, the tensile stress of the connecting body on the cell is reduced, the single cell is prevented from being broken or the sealing joint is prevented from generating cracks and even fatigue fracture, and the stability of sealing airtightness and the safety and the economical efficiency of a cell stack are finally ensured; the stress relief groove can be used as a positioning groove when assembling and sealing, so that accurate assembly and accurate pressure application of the cell in the sealing process are realized through the positioning piece, and the sealing integrity and the joint sealing performance of the single cell are further ensured.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a solid oxide fuel cell connector structure and an assembling method thereof.
Background
The traditional flat plate type solid oxide fuel cell connector (metal) has large structural rigidity, and the thermal expansion coefficient difference between the connector and a single cell (ceramic) is large, so that large tensile stress can be generated on the cell in the sealing process and the cooling process, particularly, circulating thermal stress can be generated in the circulating process, the single cell is broken or a sealing joint is cracked (fatigue fracture), the stability of air tightness is difficult to ensure, and the safety and the economy of a cell stack can be seriously influenced. In addition, the current connector structure and the cell sheet are difficult to realize accurate assembly and accurate pressure application in the sealing process, and the sealing integrity and the joint sealing performance of the cell sheet are affected.
In the prior art: the document 'a solid oxide fuel cell metal connector' optimizes the connector structure based on the flow channel design, the document 'a solid oxide fuel cell connector and electric pile' designs a heat pipe to reduce the thermal stress of a single cell, the document 'a composite brazing filler metal system for sealing an intermediate-temperature solid oxide fuel cell and a brazing method thereof' designs and researches on the components of the brazing filler metal, and the document 'flat SOFC brazing sealing thermal stress and deformation analysis' adopts a metal foil structure for sealing.
In actual production, however, the reduction of the internal stress of the structure is very limited by adopting modes such as a heat pipe and the like; the glass phase of the composite solder generates solder segregation along with the time, so that the capability of the solder gradually becomes poor and finally fails; the foil sealing is adopted to bring the change of the internal structure of the cavity and influence the efficiency, and the foil structure is in multi-connection, thereby increasing the complexity and the cost of the structure and simultaneously obviously reducing the power density of the battery stack.
Disclosure of Invention
Aiming at the technical problems of poor sealing integrity, poor joint sealing property, low efficiency and low reliability of the existing fuel cell; the invention provides a solid oxide fuel cell connector structure and an assembly method thereof, which can ensure the completeness, the sealing property and the reliability of the sealing of single cell sheets of a fuel cell, and further ensure the power density of a cell stack.
The invention is realized by the following technical scheme:
a solid oxide fuel cell connector structure comprises a sealing protrusion arranged on a connector, wherein a stress relief groove is also arranged on the connector and surrounds the outer side of the sealing protrusion; and a connecting pipe is arranged in the stress relief groove and is used for connecting a cavity defined by the air guide hole and the sealing-in bulge.
According to the invention, the stress relief groove is arranged on the connector around the outer side of the sealing protrusion, so that the structural rigidity of the sealing protrusion is reduced, the structural flexibility of the sealing protrusion is increased, the tensile stress of the connector on the cell in the sealing process and the cooling process is reduced, the single cell is prevented from being broken or the sealing joint is prevented from generating cracks and even fatigue fracture, and the stability of sealing airtightness and the safety and the economical efficiency of a cell stack are finally ensured.
Meanwhile, the stress relief groove can be used as a positioning groove when the connector and the single battery piece are assembled and sealed, so that the battery piece is accurately assembled and accurately pressed in the sealing process through the positioning piece, and the sealing integrity and the joint sealing performance of the single battery piece are further ensured.
Therefore, the invention can ensure the completeness, the sealing property and the reliability of the sealing of the single cell of the fuel cell, and further ensure the power density of the cell stack, and has the characteristics of simple structure, simple and convenient sealing and high assembly efficiency.
Furthermore, the upper end of the sealing bulge is wider than the lower end of the sealing bulge, so that the structural rigidity of the sealing bulge is further reduced and the structural flexibility of the sealing bulge is increased while the sufficient sealing area between the sealing bulge and the single battery piece is ensured, the stress and strain matching adaptability of the single battery piece in the sealing process, particularly in the operation process is further ensured, and the stability of sealing airtightness and the safety and the economical efficiency of a battery stack are further ensured.
Furthermore, stress relief notches are formed in the inner sides of the corners of the sealing protrusions, so that the continuity of the sealing protrusions, the monocell and the sealing section is guaranteed, and the structural rigidity of the sealing protrusions is further reduced.
Preferably, the depth of the stress relief groove is greater than the depth of the cavity surrounded by the sealing protrusion, so that the sealing protrusion has sufficient structural flexibility and the positioning accuracy of the positioning piece are ensured.
Preferably, the width of the stress relief notch is less than or equal to 1 mm.
The invention also provides an assembly method of the solid oxide fuel cell connector and the single cell, which comprises the steps of
The following steps:
covering a sealing material on the upper end of the sealing bulge of the connector;
covering the single battery piece on the sealing protrusion to form a cavity by the single battery piece, the sealing protrusion and the connector body;
inserting a positioning piece into a stress relief groove to enable the single battery piece to move to a sealing position, wherein the stress relief groove is arranged on the connecting body and surrounds the outer side of the sealing protrusion;
and pressing the single battery plate by the pressing piece to complete the sealing of the connecting body and the single battery plate.
As a specific implementation mode of the positioning piece, the lower end of the positioning piece is provided with a guide part and a lower positioning part, and the lower positioning part is used for positioning and pressing a sealing material, a single battery piece or an intermediate buffer layer so as to accurately position the single battery piece; the positioning piece is also provided with an upper positioning part which is used for bearing the pressing piece so as to accurately position the pressing piece.
As a specific embodiment of the pressing member, a pressing portion is arranged at the lower part of the pressing member, and the pressing portion is a protrusion with a closed shape and is used for extruding the periphery of the single cell to ensure accurate and uniform pressing, so as to ensure uniform filling of the sealing material.
Furthermore, each corner of the pressing part is provided with a filling notch so as to ensure the filling amount of the sealing material at each corner of the sealing protrusion after the sealing process.
Furthermore, at least two positioning parts are used for positioning the single battery plate at the same time, so that the positioning accuracy of the single battery plate in the sealing money assembling process is further ensured.
The invention has the following advantages and beneficial effects:
1. the stress relief groove structure is arranged on the connector and the stress relief notch is formed at the corner of the sealing protrusion, so that the rigidity of the connector is greatly reduced, the tensile stress of the connector to the single cell in the sealing process or the operation process of the single cell is eliminated or remarkably reduced, and the integrity and the sealing rate of a sealing sample piece are improved;
2. the upper end of the sealing bulge is wider than the lower end of the sealing bulge, so that the flexibility of the connector can be obviously improved, and the stress and strain matching adaptability of the single battery plate in the sealing process, particularly in the operation process can be realized;
3. the positioning piece can ensure that the connector and the single battery piece are quickly and accurately positioned, the stress strain after the single battery piece is sealed is symmetrical and uniform, and the sealing integrity and the sealing rate of the single battery piece are improved;
4. the positioning piece positions the pressing piece, so that the integrity of the sealing sample piece is improved, the pressing accuracy and uniformity in the sealing process can be ensured, the filling uniformity of the single cell sealing material is ensured, and the success rate of sealing and sealing the single cells is improved;
5. the pressing part of the pressing piece is provided with filling notches at each corner part so as to ensure the filling amount of the sealing material at each corner part of the sealing bulge after the sealing process.
6. The connector is also suitable for flat plate connection of dissimilar materials with large difference of expansion coefficients, improves the flexibility of the structure, reduces the tensile stress generated by connection among the dissimilar materials, improves the connection rate and prolongs the service life.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic view of a linker structure of the invention;
FIG. 2 is a schematic cross-sectional view of a connector according to the present invention;
FIG. 3 is a schematic view of a sealing projection corner of the present invention;
FIG. 4 is an assembled view of the present invention;
FIG. 5 is a schematic view of a positioning member according to the present invention;
FIG. 6 is a schematic cross-sectional view of a positioning member according to the present invention;
fig. 7 is a schematic view of the pressing member structure of the present invention.
Names of various parts in the drawings:
1-connector, 2-sealing projection, 3-stress relief groove, 4-connecting pipe, 5-air guide hole, 6-stress relief notch and 7-sealing
The material, 8-single battery plate, 9-positioning piece, 91-guiding part, 92-lower positioning part, 93-upper positioning part, 10-pressing part, 11-pressing part, 12-filling notch and 13-flow channel.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
With reference to fig. 1, fig. 2 and fig. 3, a solid oxide fuel cell connector 1 structure includes a sealing protrusion 2 disposed on the connector 1, a stress relief groove 3 is further disposed on the connector 1, and the stress relief groove 3 is disposed around the outer side of the sealing protrusion 2; and a connecting pipe 4 is arranged in the stress relief groove 3, and the connecting pipe 4 is used for connecting a cavity surrounded by the air guide hole 5 and the sealing protrusion 2.
Specifically, the sealing projection 2 is in a closed shape, and air holes 5 are formed in both sides of the connector 1 to provide fuel or oxidant for the fuel cell; the cross section of the connecting body structure outline and the sealing bulge 2 can be one of a square shape, a rectangular shape and other polygonal shapes, or the shape with a chamfer angle, or a circular shape and an oval shape. The inner side of the stress relief groove 3 is connected with the outer side of the sealing protrusion 2, similarly, the cross section of the stress relief groove 3 is in one of a square shape, a rectangular shape and a trapezoidal shape, or the shape is chamfered, or semicircular or arc-shaped, and the depth of the stress relief groove 3 is larger than the depth in a cavity enclosed by the single cell sheet 8 and the connector 1.
In addition, in order to ensure that the air guide hole 5 and the cavity surrounded by the sealing protrusion 2 can be used for inputting fuel or oxidant, a connecting pipe 4 is arranged in the stress relief groove 3, so that the air guide hole 5 is communicated with the cavity surrounded by the sealing protrusion 2 through the connecting pipe 4. In this embodiment, the omega-shaped thin-walled tube is used as the connecting tube 4, and it is necessary to ensure that the wall thickness of the air-guiding hole 5 is greater than or equal to 0.5 mm, and the wall thickness of the connecting tube 4 is greater than or equal to 1 mm. A plurality of flow channels 13 are arranged in the cavity enclosed by the sealing bulge 2 for fuel or oxidant to flow through.
This embodiment is through setting up stress relief groove 3 around the protruding 2 outsides of sealing-in on connector 1 to reduced the structural rigidity of protruding 2 of sealing-in, in order to increase the protruding 2 structural flexibility of sealing-in, then reduced the tensile stress that connector 1 produced the battery piece in the sealing-in process and cooling process, prevent that the monocell is broken or the sealing-in joint from producing crackle even fatigue fracture, finally guarantee the stability of sealing-in gas tightness, the security and the economic nature of battery stack.
Meanwhile, the stress relief groove 3 can be used as a positioning groove when the connector 1 and the single battery cell 8 are assembled and sealed, so that the battery cell can be accurately assembled and accurately pressed in the sealing process through the positioning piece 9, and the sealing integrity and the joint sealing performance of the single battery cell 8 can be further ensured.
Therefore, the present embodiment can ensure the completeness, the sealing performance and the reliability of the sealing of the single fuel cell sheet 8, and further ensure the power density of the cell stack, and has the characteristics of simple structure, simple and convenient sealing and high assembly efficiency.
Furthermore, the upper end of the sealing protrusion 2 is wider than the lower end, so that the structural rigidity of the sealing protrusion 2 is further reduced and the structural flexibility of the sealing protrusion 2 is increased while the sufficient sealing area between the sealing protrusion 2 and the single battery piece 8 is ensured, so that the stress and strain matching adaptability of the single battery piece 8 in the sealing process, especially in the operation process is ensured, and the stability of sealing airtightness and the safety and the economical efficiency of a battery stack are further ensured.
It can be understood that the cross section of the sealing protrusion 2 can be dovetail, inverted L, inverted trapezoid, etc. only the width of the sealing interface of the sealing protrusion 2 is larger than the width far away from the sealing interface, and for the hard sealing mode, the width of the sealing interface of the sealing protrusion 2 should be less than or equal to 3.5 mm.
Furthermore, stress relief notches 6 are formed in the inner sides of the corners of the sealing protrusion 2, so that the structural rigidity of the sealing protrusion 2 is further reduced while the continuity of the sealing protrusion 2, the single cell sheets 8 and the sealing section is ensured.
That is, when the cross section of the sealing projection 2 is one of a square, a rectangle or other polygons, in order to reduce the structural strength of the connector 1, the corners of the sealing projection 2 are incompletely cut to form the stress relief notches 6.
The cutting width of the stress relief notch 6 is 0-1 mm, and the depth of the stress relief notch is greater than that of the stress relief groove 3, so that the circumferential tensile stress of the annular sealing interface to the single cell sheet 8 is reduced, and the sealing air tightness is ensured; the length of the uncut part left after cutting is equivalent to the cross-sectional width of the sealing projection 2, and the width of the uncut part is greater than or equal to 1.5 mm in the embodiment.
After the connector 1 and the single cell 8 are assembled, the connection between the sealing protrusion 2 and a structural layer of the single cell 8 is determined according to the design width of each layer of the single cell 8, that is:
the connector 1 is connected to the anode of the single cell 8 when the anode layer has a large width, the connector 1 is connected to the electrolyte layer of the single cell 8 when the electrolyte layer has a large width, the connector 1 is connected to the separator (GDC) of the single cell 8 when the separator has a large width, and the connector 1 is connected to the cathode of the single cell 8 when the cathode layer has a large width.
Example 2
Referring to fig. 4, a method for assembling a solid oxide fuel cell connector and a single cell piece includes the following steps:
obtaining a body of the connector 1, and covering the upper end of the sealing bulge 2 of the connector 1 with a sealing material 7;
covering the single battery piece 8 on the sealing protrusion 2 to enable the single battery piece 8, the sealing protrusion 2 and the connector 1 body to enclose a cavity;
inserting two positioning pieces 9 into stress relief grooves 3 at opposite corners of the connecting body 1 to move the single battery pieces 8 to a sealing position, wherein the stress relief grooves 3 are arranged on the connecting body 1 and arranged around the outer sides of the sealing protrusions 2;
placing the pressing member 10 on the single cell sheet 8 to position the pressing member 10 by the positioning member 9;
clamping the pressing piece 10 and the connector 1 in a fastening mode, pressing the single battery piece 8 through the pressing piece 10, then fastening the whole sealing sample piece, turning the sample piece to take out the positioning piece 9, and preventing the positioning piece 9 from being connected with the whole structural component in the sealing process, so that the sealing of the connector 1 and the single battery piece 8 is completed.
As a specific embodiment of the positioning member 9, the lower end of the positioning member 9 is provided with a guide portion 91 and a lower positioning portion 92, and the lower positioning portion 92 is used for positioning and pressing the sealing material 7, the single battery sheet 8 or the intermediate buffer layer so as to accurately position the single battery sheet 8; the positioning member 9 is further provided with an upper positioning portion 93, and the upper positioning portion 93 is used for receiving the pressing member 10 so as to accurately position the pressing member 10. In order to ensure that the positioning piece 9 is convenient to take out while ensuring precise matching, the positioning piece 9 is L-shaped.
As a specific embodiment of the pressing member 10, a pressing part 11 is provided at the lower part of the pressing member 10, and the pressing part 11 is a protrusion with a closed shape and is used for pressing the outer periphery of the single battery piece 8 to ensure accurate and uniform pressing, thereby ensuring uniform filling of the sealing material 7.
Referring to fig. 5 and 6, the width of the guide part 91 of the positioning member 9 should be precisely matched with the width of the stress relief groove 3 on the connecting body 1, so as to ensure accurate positioning. The upper part of the inner side of the positioning piece 9 body is provided with an upper positioning part 93, and the upper positioning part 93 is used for bearing the body part of the pressing piece 10; the lower part of the inner side of the positioning part 9 body is a lower positioning part 92, and the lower positioning part 92 is used for positioning the sealing material 7 and the single battery sheet 8 or other intermediate buffer layers.
It can be understood that the thickness of the lower end of the positioning member 9 in the vicinity of the gas-guide hole 5 during assembly should be no greater than the depth of the groove in the vicinity of the gas-guide hole 5, i.e., the height of the guide portion 91 of the positioning member 9 should be less than or equal to the depth of the stress relief groove 3.
The pressing piece 10 applies pressure precisely to the connecting interface, the shape of the pressing piece 10 is an annular structure consistent with the shape of the connecting interface, and the shape corresponding to the square connecting body structure is a 'return' shape, so that the pressing is precise and uniform, and the sealing material is filled uniformly.
For the polygonal annular connecting interface, in order to ensure the filling amount of the sealing material 7 at each corner after the sealing process, a sinking platform is preset at each corner of the pressing part 11 of the pressing part 10, or a certain gap is reserved, and the gap amount is 0-0.1 mm or not more than the thickness of the sealing material 7. Namely, each corner of the pressing part 11 is provided with a filling notch 12 to ensure the filling amount of each corner of the sealing bulge 2 after the sealing process of the sealing material 7.
The pressing member 10 is made of a metal material or a graphite material, and is particularly made of a ceramic material for a solid oxide fuel cell unit or a metal/ceramic seal.
Further, at least two positioning members 9 are used to position the single battery plate 8 at the same time, so as to further ensure the positioning accuracy of the single battery plate during the assembly of the sealing money.
It should be understood that the connector 1 of the present embodiment may be the connector structure described in embodiment 1, or may be other connector structures having stress relief grooves.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A solid oxide fuel cell connector structure comprises a sealing protrusion (2) arranged on a connector (1), and is characterized in that a stress relief groove (3) is further arranged on the connector (1), and the stress relief groove (3) is arranged around the outer side of the sealing protrusion (2); and a connecting pipe (4) is arranged in the stress relief groove (3), and the connecting pipe (4) is used for connecting a cavity surrounded by the air guide hole (5) and the sealing protrusion (2).
2. Solid oxide fuel cell interconnect structure according to claim 1, characterized in that the sealing-in protrusions (2) are wider at the upper end than at the lower end.
3. Solid oxide fuel cell interconnect structure according to claim 1 or 2, characterized in that inside each corner of the sealing-in protrusion (2) is provided with a stress relief notch (6).
4. Solid oxide fuel cell interconnect structure according to claim 1, wherein the depth of the stress relief groove (3) is larger than the depth of the cavity enclosed by the sealing protrusion (2).
5. Solid oxide fuel cell interconnect structure according to claim 3, characterized in that the stress relief notches (6) have a width of less than or equal to 1 mm.
6. A method for assembling a solid oxide fuel cell assembly and a single cell, comprising the steps of:
covering a sealing material (7) at the upper end of the sealing bulge (2) of the connector (1);
covering the single battery piece (8) on the sealing protrusion (2) to enable the single battery piece (8), the sealing protrusion (2) and the connector body (1) to enclose a cavity;
inserting a positioning piece (9) into the stress relief groove (3) to enable the single battery piece (8) to move to a sealing position, wherein the stress relief groove (3) is arranged on the connecting body (1) and surrounds the outer side of the sealing protrusion (2);
and pressing the single battery pieces by a pressing piece (10) to complete the sealing of the connecting body (1) and the single battery pieces (8).
7. The assembly method of the solid oxide fuel cell connector and the single cell piece according to claim 6, wherein the lower end of the positioning member (9) is provided with a guide part (91) and a lower positioning part (92), and the lower positioning part (92) is used for positioning and pressing the sealing material (7), the single cell piece (8) or the intermediate buffer layer.
8. The method for assembling a connected solid oxide fuel cell and a single cell piece according to claim 6, wherein a pressing part (11) is provided at the lower part of the pressing member (10), and the pressing part (11) is a protrusion with a closed shape for pressing the outer periphery of the single cell piece (8).
9. The method of assembling a connected solid oxide fuel cell and a single cell according to claim 8, wherein each corner of the pressing portion (11) is provided with a filling notch (12).
10. The method of assembling a joined solid oxide fuel cell and a single cell according to claim 6, wherein the single cell (8) is positioned by using at least two positioning members (9) at the same time.
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| CN202010721968.9A CN111834644B (en) | 2020-07-24 | 2020-07-24 | Solid oxide fuel cell connector structure and assembling method thereof |
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| CN112242536B (en) * | 2019-07-16 | 2022-03-18 | 未势能源科技有限公司 | Bipolar plate structure for fuel cell, fuel cell and fuel cell vehicle |
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| DE10334129B4 (en) * | 2003-07-25 | 2010-04-08 | Staxera Gmbh | Method and device for producing a fuel cell stack |
| CN103700801A (en) * | 2013-12-30 | 2014-04-02 | 中国科学院宁波材料技术与工程研究所 | Solid oxide fuel cell stack and cell connector thereof |
| CN203871425U (en) * | 2014-06-06 | 2014-10-08 | 昆山艾可芬能源科技有限公司 | Solid oxide fuel cell and cell stack |
| CN106549172B (en) * | 2016-11-02 | 2019-06-11 | 西安交通大学 | A kind of self-sealing flat solid oxide fuel cell connector and preparation method |
| CN208208883U (en) * | 2018-09-06 | 2018-12-07 | 常州联德电子有限公司 | A kind of solid oxide fuel cell metal connector |
| CN109786785B (en) * | 2019-01-04 | 2022-09-20 | 潮州三环（集团）股份有限公司 | Flat-plate type solid oxide fuel cell stack |
| CN110729498B (en) * | 2019-10-22 | 2021-07-23 | 中国矿业大学 | A flat-type solid oxide fuel cell sealing structure |
| CN111403767B (en) * | 2020-03-31 | 2022-05-17 | 西安交通大学 | Solid oxide fuel cell/electrolyzer and stack structure |
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