WO2018134955A1 - Plaque bipolaire, cadre de cellule et empilement de cellules, et batterie à flux redox - Google Patents

Plaque bipolaire, cadre de cellule et empilement de cellules, et batterie à flux redox Download PDF

Info

Publication number
WO2018134955A1
WO2018134955A1 PCT/JP2017/001825 JP2017001825W WO2018134955A1 WO 2018134955 A1 WO2018134955 A1 WO 2018134955A1 JP 2017001825 W JP2017001825 W JP 2017001825W WO 2018134955 A1 WO2018134955 A1 WO 2018134955A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrode
bipolar plate
frame
cell
peripheral edge
Prior art date
Application number
PCT/JP2017/001825
Other languages
English (en)
Japanese (ja)
Inventor
勇人 藤田
Original Assignee
住友電気工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 住友電気工業株式会社 filed Critical 住友電気工業株式会社
Priority to PCT/JP2017/001825 priority Critical patent/WO2018134955A1/fr
Publication of WO2018134955A1 publication Critical patent/WO2018134955A1/fr

Links

Images

Classifications

    • 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
    • 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
    • H01M8/18—Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells
    • 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

Definitions

  • the present invention relates to a bipolar plate, a cell frame, a cell stack, and a redox flow battery.
  • a redox flow battery is one of large-capacity storage batteries that store electric power derived from natural energy such as solar power generation and wind power generation.
  • An RF battery mainly includes a battery cell including a positive electrode to which a positive electrode electrolyte is supplied, a negative electrode to which a negative electrode electrolyte is supplied, and a diaphragm interposed between both electrodes. Charging / discharging is performed by supplying an electrolytic solution of each electrode to the electrode.
  • the battery cell is typically formed using a cell frame including a bipolar plate in which electrodes of each electrode are arranged on the front and back surfaces, and a resin frame provided on the outer peripheral edge of the bipolar plate. .
  • a cell stack including a laminate formed by laminating a cell frame, a positive electrode, a diaphragm, and a negative electrode in this order is used.
  • the cell frame includes a rectangular bipolar plate and a rectangular frame-shaped frame surrounding the outer peripheral edge thereof.
  • recesses are formed on the surface of the bipolar plate and the inner peripheral surface of the frame.
  • An electrode (positive electrode or negative electrode) is disposed in the recess, and a space surrounded by the recess and the diaphragm forms a cell (positive cell or negative cell).
  • the bipolar plate of the present disclosure is A bipolar plate having a surface on which electrodes are disposed, A fitting groove is formed on the surface and into which the outer peripheral edge of the electrode is fitted.
  • the cell frame of the present disclosure is A bipolar plate of the present disclosure; A frame surrounding an outer peripheral edge of the bipolar plate.
  • the cell stack of the present disclosure is A cell frame of the present disclosure; An electrode having an outer peripheral edge fitted in the fitting groove of the bipolar plate; An electrode pressing plate facing the outer peripheral edge of the electrode.
  • the redox flow battery of the present disclosure includes the cell stack of the present disclosure.
  • FIG. 5 is a partial cross-sectional view showing a state in which the cell frame shown in FIG. 4 is cut along a (V)-(V) cutting line.
  • FIG. 5 is a partial cross-sectional view showing a state in which the cell frame shown in FIG. 4 is cut along a (VI)-(VI) cutting line.
  • the cell stack, the positive electrode, the diaphragm, and the negative electrode are normally stacked in this order to assemble the laminate of the cell stack. Since the electrodes are merely arranged in the recesses of the cell frame without being positioned with respect to the bipolar plate, the electrodes are liable to be displaced during assembly. In particular, when the size of the electrode is considerably smaller than the recess, the positional deviation of the electrode tends to be remarkable.
  • an object of the present invention to provide a bipolar plate, a cell frame, and a cell stack that can prevent positional displacement of electrodes during assembly and improve the assembly workability of a redox flow battery.
  • Another object of the present invention is to provide a redox flow battery excellent in assembly workability.
  • the bipolar plate according to one aspect of the present invention is: A bipolar plate having a surface on which electrodes are disposed, A fitting groove is formed on the surface and into which the outer peripheral edge of the electrode is fitted.
  • the cell frame, the positive electrode, the diaphragm, and the negative electrode having the bipolar plate as described above are stacked in this order, so that the electrode is pressed by the member overlying the outer peripheral edge portion. This is because it is fitted in the fitting groove of the bipolar plate. Therefore, positioning of the electrode with respect to the bipolar plate is easy, and the assembly workability of the redox flow battery can be improved.
  • the fitting groove may be formed in an annular shape along the entire outer peripheral edge of the electrode.
  • the outer peripheral edge portion of the electrode is fitted over the entire circumference and is fitted into the groove portion, it is easy to suppress positional displacement over a wide range of the electrode, so that the electrode can be positioned more easily with respect to the bipolar plate.
  • the assembly workability of the redox flow battery can be further enhanced.
  • a cell frame according to an aspect of the present invention includes the bipolar plate according to (1) or (2) above and a frame that surrounds an outer peripheral edge of the bipolar plate.
  • the combination workability of the redox flow battery can be improved by providing the bipolar plate that easily suppresses the displacement of the electrode.
  • a cell stack according to an aspect of the present invention includes: The cell frame of (3) above; An electrode having an outer peripheral edge fitted in the fitting groove of the bipolar plate; An electrode pressing plate facing the outer peripheral edge of the electrode.
  • the assembly workability of the redox flow battery can be improved by providing the cell frame.
  • the electrode pressing plate by providing the electrode pressing plate, it is easy to suppress the positional deviation of the electrode during assembly, and the electrode is arranged on the bipolar plate so that the cell frame and the electrode are integrated into a battery cell or Since the cell stack can be assembled, it is easy to improve the assembly workability of the redox flow battery. It is also possible to assemble the battery cell and the cell stack by stacking the cell frame and the electrodes so that the electrodes are on top and putting them together with an electrode pressing plate, and then turning them over so that the electrodes are on the bottom. In this case, it is easy to suppress the displacement of the electrode and the electrode can be supported by the electrode pressing plate. Therefore, it is easy to suppress the electrode from dropping between the cell frame and the electrode pressing plate.
  • the fitting groove portion is not provided, if the electrode is thinned, the electrode is excessively pressed by the bipolar plate and the electrode pressing plate, and the surface pressure is concentrated, so that the bipolar plate may be broken.
  • the fitting groove is provided, it is easy to suppress the concentration of surface pressure without excessively pressing the electrode with the bipolar plate and the electrode holding plate even if the electrode is thin. Can be prevented from cracking.
  • the thinner the electrode the less likely it is to generate a repulsive force, and the effect of preventing the displacement of the electrode during assembly by the electrode retainer plate is likely to be reduced.However, the electrode is formed between the bipolar plate and the electrode retainer plate by the corners that form the fitting groove. It is because it is easy to press. The thinner the electrode, the more preferable it is to suppress the increase in the internal resistance of the battery.
  • a redox flow battery according to an aspect of the present invention includes the cell stack of (4) above.
  • the assembly workability is excellent.
  • the RF battery 1 typically includes a power generation unit (for example, a solar power generation device, a wind power generation device, and other general power plants) and a load (demand) via an AC / DC converter.
  • the power generated by the power generation unit is charged and stored, and the stored power is discharged and supplied to the load.
  • This charging / discharging uses an electrolytic solution containing metal ions whose valence is changed by oxidation-reduction as an active material for the positive electrode electrolyte and the negative electrode electrolyte, and the redox potential of the ions contained in the positive electrode electrolyte and the negative electrode electrolysis. This is performed using the difference between the redox potential of ions contained in the liquid.
  • a power generation unit for example, a solar power generation device, a wind power generation device, and other general power plants
  • a load demand
  • the power generated by the power generation unit is charged and stored, and the stored power is discharged and supplied to the load.
  • This charging / discharging uses an electro
  • the RF battery 1 is used for, for example, load leveling applications, applications such as sag compensation and emergency power supplies, and output smoothing of natural energy such as solar power generation and wind power generation, which are being introduced in large quantities. .
  • the RF battery 1 includes a battery cell 100 separated into a positive electrode cell 102 and a negative electrode cell 103 by a diaphragm 101 that transmits hydrogen ions.
  • a positive electrode 71 is built in the positive electrode cell 102, and the positive electrode electrolyte is circulated by the positive electrode circulation mechanism 100P.
  • the positive electrode circulation mechanism 100P is provided in the middle of the positive electrode electrolyte tank 106 that stores the positive electrode electrolyte, the supply conduit 108 that connects the positive electrode cell 102 and the positive electrode electrolyte tank 106, the discharge conduit 110, and the supply conduit 108.
  • a negative electrode 72 is built in the negative electrode cell 103, and the negative electrode electrolyte is circulated by the negative electrode circulation mechanism 100N.
  • the negative electrode circulation mechanism 100N is provided in the middle of the negative electrode electrolyte tank 107 that stores the negative electrode electrolyte, the supply conduit 109 that connects the negative electrode cell 103 and the negative electrode electrolyte tank 107, and the supply conduit 109.
  • the pump 113 is provided. During the operation of charging / discharging, each of the electrode electrolytes is supplied from the electrode electrolyte tanks 106 and 107 through the supply conduits 108 and 109 to the electrode cells 102 and 103 by the pumps 112 and 113.
  • the cells 102 and 103 are circulated to the electrode cells 102 and 103 by flowing through the discharge conduits 110 and 111 and being discharged to the electrode electrolyte tanks 106 and 107. During standby when charging / discharging is not performed, the pumps 112 and 113 are stopped, and each electrode electrolyte is not circulated.
  • the battery cell 100 is usually formed inside a structure called a cell stack 2 shown in the lower diagrams of FIGS.
  • the cell stack 2 is configured by sandwiching a laminated body called a sub stack 200 (the lower diagram in FIG. 3) between two end plates 220 from both sides, and tightening both end plates 220 with a tightening mechanism 230.
  • a form including a plurality of substacks 200 is illustrated. 2 and 3, the sub-stack 200 is formed by laminating a plurality of cell frames 3, a positive electrode 71, a diaphragm 101, and a negative electrode 72 in this order, and supplying them to both ends of the laminated body.
  • a drain plate 210 (the lower diagram in FIG. 3 and omitted in FIG. 2) is arranged.
  • the cell frame 3 includes a bipolar plate 4 and a frame 5 surrounding the outer peripheral edge portion 40, and a recess 30 in which the electrode 7 is disposed is formed by the surface of the bipolar plate 4 and the inner peripheral surface of the frame 5.
  • One battery cell 100 is formed between the bipolar plates 4 of the adjacent cell frames 3, and the positive electrode 71 (positive electrode cell 102) and the negative electrode 72 (negative electrode) of the adjacent battery cell 100 are placed on both sides of the bipolar plate 4.
  • Cell 103 ).
  • the cell frame 3 includes an intermediate cell frame disposed between adjacent battery cells 100 (FIGS. 1 to 3) of the stacked body and end cell frames disposed at both ends of the stacked body.
  • the positive electrode 71 of one battery cell 100 and the negative electrode 72 of the other battery cell 100 are in contact with the front and back of the bipolar plate 4, and the end cell frame has the battery cell 100 on one surface of the bipolar plate 4.
  • the configuration of the front and back (positive electrode side / negative electrode side) surfaces of the cell frame 3 is the same in both the intermediate cell frame and the end cell frame.
  • the frame 5 supports the bipolar plate 4 and forms a region to be the battery cell 100 on the inner side.
  • the shape of the frame 5 is a rectangular frame shape, and the opening shape of the recessed part 30 is a rectangular shape.
  • the frame 5 is opposed to the liquid supply side piece 51 (lower side in FIG. 3) having a liquid supply manifold 51m and a liquid supply slit 51s for supplying the electrolyte into the battery cell 100, and the liquid supply side piece 51.
  • the battery cell 100 includes a drainage manifold 52m that drains the electrolyte and a drainage side piece 52 (upper side in FIG. 3) having a drainage slit 52s.
  • the direction in which the liquid supply side piece 51 and the drainage side piece 52 are opposed to each other is the vertical direction, and the direction orthogonal to the vertical direction is the horizontal direction, the liquid supply side piece 51 is The drain side piece 52 is located on the upper side in the vertical direction. That is, the flow of the electrolytic solution is a direction from the lower side in the vertical direction of the frame 5 toward the upper side in the vertical direction.
  • the liquid supply side piece 51 may be formed with a liquid supply rectification portion (not shown) that is formed on the inner edge thereof and diffuses the electrolyte flowing through the liquid supply slit 51s along the inner edge.
  • the drainage side piece 52 may be formed with a drainage rectification unit (not shown) that is formed on the inner edge of the drainage piece 52 and collects the electrolyte solution that has passed through the electrode 7 and flows it to the drainage slit 52s.
  • each electrolyte solution in the cell frame 3 is as follows.
  • the positive electrode electrolyte is supplied from the supply manifold 51m to the positive electrode 71 through the supply slit 51s formed in the supply side piece 51 on the one surface side (the front side of the paper) of the frame 5.
  • the positive electrolyte flows from the lower side to the upper side of the positive electrode 71 and flows through the drain slit 52s formed in the drain side piece 52 as shown by the arrow in the upper diagram of FIG. It is discharged at 52m.
  • the supply and discharge of the negative electrode electrolyte are the same as those of the positive electrode electrolyte except that the negative electrode electrolyte is supplied and discharged on the other surface side (the back side of the paper).
  • annular seal member 80 such as an O-ring or a flat packing is disposed in an annular seal groove to suppress leakage of the electrolyte from the battery cell 100.
  • Embodiment 1 The RF battery 1 according to Embodiment 1 will be described with reference to FIGS. 4 to 6 (FIGS. 1 to 3 as appropriate).
  • One of the features of the RF battery 1 according to the first embodiment is that the bipolar plate 4 has a fitting groove portion 41 into which the outer peripheral edge portion 70 of the electrode 7 is fitted.
  • one of the features of the RF battery 1 according to the first embodiment includes an electrode pressing plate 6 having opposing surfaces facing both the outer peripheral edge portions 70 of the electrode 7, and the electrode pressing plate 6 and the bipolar plate 4
  • the object is to provide a displacement prevention structure that prevents the displacement of the electrode 7 by sandwiching the outer peripheral edge portion 70 of the electrode 7 between the fitting groove 41.
  • FIG. 1 For convenience of explanation, in FIG.
  • the electrode pressing plate 6 is indicated by a thin two-dot chain line
  • the electrode 7 is indicated by a thick two-dot chain line.
  • each manifold, each slit, and the seal member of the frame 5 are omitted. It shows.
  • the horizontal direction on the paper is the horizontal direction
  • the vertical direction on the paper is the vertical direction.
  • the frame 5 is formed by laminating two frame-shaped plate members whose cross-sectional shapes are symmetric (FIGS. 5 and 6).
  • the inner peripheral edge portion 50i of the frame-shaped plate material is formed thin, and when the outer peripheral edge portions 50o of the two frame-shaped plate materials are bonded to each other, the outer periphery of the bipolar plate 4 is between the inner peripheral edge portions 50i of the two frame-shaped plate materials.
  • a space for accommodating the peripheral edge portion 40 is formed.
  • the frame 5 is not integrated with the bipolar plate 4, but may be integrated with the bipolar plate 4 by injection molding, for example.
  • a storage recess 57 for the electrode pressing plate 6 is formed on the outer side surfaces of both frame-shaped plate members.
  • the thickness Ft of the frame 5 can be 4 mm or more. If the thickness Ft of the frame 5 is 4 mm or more, the strength of the laminate (cell stack 2) can be easily maintained.
  • the upper limit of the thickness Ft of the frame 5 can be set to 8 mm or less, for example. As the thickness Ft of the frame 5 increases, the strength can be maintained. However, if the thickness Ft is excessively thick, the laminated body becomes larger.
  • the thickness Ft of the frame 5 can be 4 mm or more and 7 mm or less.
  • the material of the frame 5 includes a material satisfying acid resistance, electrical insulation, and mechanical properties.
  • Examples thereof include various fluorine resins such as polytetrafluoroethylene, polypropylene resin, polyethylene resin, and vinyl chloride resin.
  • the bipolar plate 4 partitions adjacent battery cells 100 (FIGS. 2 and 3).
  • One surface side of the bipolar plate 4 provided in the intermediate cell frame is in contact with the positive electrode 71, and the other surface side is in contact with the negative electrode 72.
  • One surface side of the bipolar plate 4 provided in the end cell frame is in contact with the positive electrode 71 or the negative electrode 72, and the other surface side is not in contact with the electrode.
  • the bipolar plate 4 has a rectangular shape (FIG. 4).
  • the outer peripheral edge 40 of the bipolar plate 4 is an area sandwiched between the inner peripheral edges 50i of the frame 5 and is fixed to the frame 5 (FIGS. 5 and 6).
  • the bipolar plate 4 is fixed to the frame 5 by sandwiching the outer peripheral edge portion 40 of the bipolar plate 4 between the two frame-shaped plate members constituting the frame 5.
  • a fitting groove 41 into which the outer peripheral edge 70 of the electrode 7 is fitted is formed in a portion of the bipolar plate 4 exposed from the frame 5 (FIGS. 4 to 6).
  • the fitting groove 41 In the fitting groove 41, the outer peripheral edge 70 of the electrode 7 is fitted. Thereby, it is easy to suppress the displacement of the electrode 7 with respect to the bipolar plate 4.
  • the cell frame 3, the positive electrode 71, the diaphragm 101, and the negative electrode 72 are stacked in this order, so that the electrode 7 is pressed by the member overlying the outer peripheral edge 70. This is because it is fitted into the fitting groove 41 of the plate 4. Therefore, the positioning of the electrode 7 with respect to the bipolar plate 4 is easy, and the assembly workability of the RF battery 1 can be improved.
  • the fitting groove 41 prevents the positional deviation of the electrode 7 with respect to the bipolar plate 4 by sandwiching the outer peripheral edge 70 of the electrode 7 between the electrode pressing plate 6 described later. At this time, even if the electrode 7 is thin, concentration of surface pressure can be easily suppressed without excessively pressing the electrode 7 with the bipolar plate 4 and the electrode pressing plate 6. Therefore, the crack of the bipolar plate 4 accompanying the concentration of the surface pressure can be suppressed. In addition, even if the electrode 7 is thin, it is easy to suppress the displacement of the electrode 7.
  • the thickness of the electrode 7 is thinner, a repulsive force is less likely to be generated, and the effect of preventing the displacement of the electrode 7 during assembly by the electrode pressing plate 6 can be easily reduced, but the bipolar plate 4 and the electrode are formed by the corners formed in the fitting groove 41. This is because it is easy to press the electrode 7 with the presser plate 6. The thinner the electrode 7 is, the easier it is to suppress the increase in the internal resistance of the battery, which is preferable.
  • the fitting groove portion 41 may be formed intermittently along the circumferential direction of the outer peripheral edge portion 70 of the electrode 7 so as to fit a part of the outer peripheral edge portion 70 of the electrode 7 in the circumferential direction.
  • the outer circumferential edge 70 may be formed continuously along the circumferential direction of the outer circumferential edge 70 of the electrode 7 so as to fit the entire circumferential circumference.
  • the place where the fitting groove portion 41 is formed can be appropriately selected according to the arrangement position of the electrode 7, that is, the position of the outer peripheral edge portion 70 of the electrode 7.
  • the fitting groove portion 41 is formed in an annular shape continuous along the entire circumference so as to fit the entire circumference of the outer peripheral edge portion 70 of the electrode 7 (FIG. 4). Therefore, the concentration of the surface pressure can be suppressed over the entire circumference of the outer peripheral edge portion 70 of the electrode 7.
  • the shape of the fitting groove portion 41 when the bipolar plate 4 is viewed in plan is a shape along the outer shape of the electrode 7, in this case, a rectangular frame shape.
  • the fitting groove 41 fits a pair of fitting lateral groove portions 41x into which the outer peripheral edge portions 70 on the lower side (liquid supply side) and upper side (drainage side) of the electrode 7 are fitted, and the outer peripheral edge portions 70 on both the left and right sides of the electrode 7.
  • the pair of fitting horizontal groove portions 41x are formed in parallel to each other, and the pair of fitting vertical groove portions 41y are orthogonal to the both fitting horizontal groove portions 41x and face each other. Both fitting horizontal groove portions 41x and both fitting vertical groove portions 41y are continuous.
  • the place where the fitting groove 41 is formed is a position overlapping with a flow path 42 described later. Specifically, it is between an introduction lateral groove 43x and a discharge lateral groove 44x, which will be described later. More specifically, the lower fitting horizontal groove portion 41x crosses the introduction vertical groove portion 43y and the horizontal flange portion 45x between the introduction horizontal groove portion 43x and the introduction side end portion (lower end portion) of the discharge vertical groove portion 44y. Formed.
  • the upper fitting horizontal groove portion 41x is formed so as to cross the discharge vertical groove portion 44y and the horizontal flange portion 45x between the discharge horizontal groove portion 44x and the discharge side end portion (upper end side) of the introduction vertical groove portion 43y.
  • each fitting horizontal groove part 41x constitutes a part of each vertical groove part 43y, 44y.
  • the pair of fitting vertical groove portions 41 y are formed outside the introduction vertical groove portions 43 y at the left and right ends on the surface of the bipolar plate 4.
  • the cross-sectional shape of the fitting groove 41 is a quadrangular shape whose width is uniform from the opening to the bottom. That is, the depth Dd and the width Wd of the fitting groove 41 are uniform in the longitudinal direction.
  • the depth Dd of the fitting groove 41 can be appropriately selected mainly depending on the type of the electrode 7 described later (FIGS. 5 and 6). As will be described later, the depth Dd corresponding to the type of the electrode 7 is preferably about 0.1 mm to 2.5 mm. If the depth Dd is 0.1 mm or more, it is easy to prevent displacement of the electrode 7 without excessively pressing the electrode 7 with the bipolar plate 4 and the electrode pressing plate 6. If the depth Dd is 2.5 mm or less, the electrode 7 can be sufficiently sandwiched between the bipolar plate 4 and the electrode pressing plate 6, and the electrode 7 is not easily displaced from between the bipolar plate 4 and the electrode pressing plate 6.
  • the depth Dd is more preferably 0.3 mm or greater and 1.0 mm or less, still more preferably 0.7 mm or less, and particularly preferably 0.5 mm or less.
  • the depth Dd of the fitting groove 41 is smaller than the depth of the flow path 42.
  • the width Wd of the fitting groove portion 41 can be appropriately selected mainly in accordance with a lapping margin Wr of the electrode pressing plate 6 described later.
  • the width Wd of the fitting groove portion 41 is larger than the wrapping margin Wr, and is preferably about 10 mm or more. If the width Wd of the fitting groove portion 41 is 10 mm or more, the outer peripheral edge portion 70 of the electrode 7 can be fitted into the fitting groove portion 41 over a wide range, and the positional deviation of the electrode 7 can be easily prevented.
  • the upper limit of the width Wd of the fitting groove 41 is, for example, 25 mm or less.
  • the width Wd of the fitting groove 41 refers to the length along the direction orthogonal to the longitudinal direction of the fitting groove 41.
  • the linear distance D between the corner portion constituting the fitting groove portion 41 and the corner portion of the inner peripheral edge portion of the electrode pressing plate 6 may be approximately equal to the thickness Et (described later) of the outer peripheral edge portion 70 of the electrode 7. preferable. If it does so, it will be easy to suppress the position shift of the electrode 7 at the time of the assembly of the said laminated body, and it will be easier to further suppress the excessive load to the electrode 7 by both corners after the said laminated body is assembled.
  • the fitting groove 41 may be composed of a plurality of grooves formed intermittently along the circumferential direction of the outer peripheral edge 70 of the electrode 7.
  • the fitting groove portion 41 is constituted by a plurality of groove portions
  • the shape and formation location of the groove portions are not particularly limited and can be selected as appropriate.
  • the fitting groove portion 41 can be configured to include only one of the pair of fitting horizontal groove portions 41x and the pair of fitting vertical groove portions 41y, but not the other.
  • the fitting groove 41 may be formed at a position where the outer peripheral edge 70 of the electrode 7 is fitted.
  • the flow path 42 adjusts the flow of the electrolyte solution on the bipolar plate 4 (FIG. 4).
  • the flow of the electrolyte can be adjusted by the shape and size of the flow path 42.
  • the flow path 42 includes an introduction path 43 for introducing the electrolytic solution into the electrode 7 and a discharge path 44 for discharging the electrolytic solution from the electrode 7.
  • the introduction path 43 is connected to the liquid supply slit 51s (FIG. 3), and the discharge path 44 is connected to the liquid discharge slit 52s (FIG. 3).
  • the introduction path 43 and the discharge path 44 may communicate with each other, but are preferably independent.
  • the shape of the flow path 42 is a mesh-type opposed comb tooth in which the introduction path 43 and the discharge path 44 each have a comb-shaped region and are arranged so that the respective comb teeth mesh with each other and face each other.
  • the introduction path 43 includes an introduction port 43i that guides the electrolyte from the liquid supply slit 51s into the introduction path 43, a single introduction lateral groove 43x that extends in the left and right directions and diffuses the electrolyte from the introduction port 43i to the left and right. And a plurality of introduction longitudinal groove portions 43y extending upward from the lateral groove portions.
  • the discharge path 44 extends to the left and right and communicates with the plurality of discharge vertical groove portions 44y disposed between the introduction vertical groove portions 43y, and collects the electrolyte from the discharge vertical groove portions 44y.
  • One discharge horizontal groove 44x and a discharge port 44o for discharging the electrolyte from the discharge horizontal groove 44x to the drain slit 52s are provided. That is, the longitudinal groove portions of the introduction path 43 and the discharge path 44 are arranged in parallel so as to alternately mesh with each other.
  • a flange portion 45 is formed between the groove portions.
  • the collar portion 45 is hatched for convenience of explanation.
  • the flange portion 45 includes a vertical flange portion 45y formed between the adjacent introduction vertical groove portion 43y and the discharge vertical groove portion 44y, between the introduction horizontal groove portion 43x and the discharge vertical groove portion 44y, and between the introduction vertical groove portion 43y and the discharge horizontal groove portion. 44x is formed between and 44x.
  • the flange portions 45 between the introduction vertical groove portions 43y and between the discharge vertical groove portions 44y connect one ends of the adjacent vertical flange portions 45y.
  • the width and depth of the groove and the interval between adjacent grooves are not particularly limited, and can be appropriately selected according to the size and thickness of the bipolar plate 4.
  • the width of the groove portion may be uniform in the longitudinal direction, or may be different in the longitudinal direction so that the width decreases from one of the inflow port and the outflow port to the other, for example.
  • the width of the flow path 42 may be uniform in the depth direction, or may be different in the depth direction, such as a dovetail that narrows from the opening toward the bottom. .
  • the width and depth of the flow path 42 are uniform in the longitudinal direction. That is, the cross-sectional shape of the flow path 42 is a quadrangular shape whose width is uniform from the opening to the bottom.
  • the flow of the electrolytic solution forms a flow along the flow path 42 (indicated by horizontal and vertical thin arrows) and a flow that crosses the flange 45 (obliquely inclined thin arrows). That is, when the electrolytic solution introduced from the introduction passage 43 flows through the electrode 7 to the discharge passage 44, the electrolytic solution performs a battery reaction in the electrode 7 at the flange portion 45. Since the introduced electrolytic solution is discharged by crossing the flange 45, the electrolytic solution discharged without being reacted is reduced. Therefore, the amount of current of the RF battery 1 increases, and as a result, the internal resistance of the RF battery 1 can be reduced.
  • the shape of the flow path 42 is a mesh type, a known non-mesh type opposed comb tooth shape, a stripe shape in which the plurality of flow paths 42 are formed by vertical grooves along the longitudinal direction of the frame body 5, a grid shape, It can be an intermittent shape, a series of serpentine shapes, and the like.
  • the thickness of the exposed region (excluding the flow path 42) exposed from both the inner peripheral edge 50 i of the frame 5 and the electrode 7 is such that the outer peripheral edge 40 i overlapping the inner peripheral edge 50 i and the electrode 7 It is thicker than the thickness of the inner region of the fitting groove 41 (FIGS. 5 and 6).
  • the exposed region includes a horizontal flange portion 45x between the fitting horizontal groove portion 41x and the introduction horizontal groove portion 43x, a horizontal flange portion 45x between the fitting horizontal groove portion 41x and the discharge horizontal groove portion 44x, and the outer peripheral edge portion 40.
  • the specific thickness of the exposed region is substantially the same as the surface of the inner peripheral edge 50i on the electrode pressing plate 6 side (FIGS. 5 and 6).
  • the exposed area is preferably in contact with the electrode pressing plate 6. If it does so, the distribution
  • the thickness of the region between the fitting vertical groove portion 41y and the introducing vertical groove portion 43y is smaller than the thickness of the exposed region, but thicker than the thickness of the bottom of the fitting groove portion 41.
  • a seal groove 48 is formed on the outer peripheral edge portion 40 of the bipolar plate 4 over the entire circumference (FIGS. 5 and 6), and a seal member 81 (for example, an O-ring) is disposed in the seal groove 48. Yes.
  • the seal member 81 suppresses the flow of the electrolyte solution between the one surface side and the other surface side of the bipolar plate 4, and also suppresses the leakage of the electrolyte solution to the outside of the laminate.
  • the seal groove 48 in the outer peripheral edge portion 40 of the bipolar plate 4 and the seal member between the frame 5 and the bipolar plate 4 are used. There is no need for 81.
  • the thickness Bt of the bipolar plate 4 is preferably “(thickness Ft of the frame 5) ⁇ 2 mm” or more (FIGS. 5 and 6). This is because as the bipolar plate 4 becomes thicker, the electrode 7 can be made thinner, and an increase in internal resistance is easily suppressed.
  • the upper limit of the thickness Bt of the bipolar plate 4 is preferably “(thickness Ft of the frame 5) ⁇ 0.4 mm” or less. This is because if the electrode 7 becomes too thin, the electrode 7 is likely to be displaced during assembly of the laminate.
  • the thickness Bt of the bipolar plate 4 refers to the thickness of the outer peripheral edge portion 40 of the bipolar plate 4.
  • the material of the bipolar plate 4 can be a material that allows current to pass but not electrolyte.
  • a material having acid resistance and moderate rigidity is preferable.
  • An example of such a material is a conductive material containing carbon.
  • Specific examples include conductive plastics formed from graphite and polyolefin-based organic compounds or chlorinated organic compounds. Further, a conductive plastic in which a part of graphite is substituted with at least one of carbon black and diamond-like carbon may be used.
  • the polyolefin organic compound include polyethylene, polypropylene, polybutene and the like.
  • the chlorinated organic compound include vinyl chloride, chlorinated polyethylene, and chlorinated paraffin.
  • the bipolar plate 4 can be manufactured by molding the above-mentioned material by a known method such as injection molding, press molding, or vacuum molding.
  • the fitting groove 41, the flow path 42, and the seal groove 48 may be formed simultaneously with this molding. Then, the manufacturing efficiency of the bipolar plate 4 is excellent.
  • the electrode pressing plate 6 prevents the displacement of the electrode 7 (FIGS. 4 to 6). As described above, the displacement of the electrode 7 is prevented by sandwiching the outer peripheral edge portion 70 of the electrode 7 between the electrode pressing plate 6 and the fitting groove portion 41 of the bipolar plate 4.
  • the electrode pressing plate 6 has a function of protecting the diaphragm 101 (FIG. 3). Specifically, the electrode pressing plate 6 covers the slits 51 s and 52 s (FIG. 3), prevents the diaphragm 101 from coming into direct contact with the slits 51 s and 52 s, and the diaphragm 101 is formed by the unevenness of the slits 51 s and 52 s. Suppresses damage.
  • a frame body facing surface 61 that faces the inner peripheral edge portion 50 i of the frame body 5 and an electrode facing surface 62 that faces the outer peripheral edge portion 70 of the electrode 7 (see FIGS. 5 and 5). 6). That is, the electrode pressing plate 6 is disposed so as to straddle the frame 5 and the electrode 7. The frame facing surface 61 and the electrode facing surface 62 are flush with each other.
  • a diaphragm 101 (FIG. 3) is disposed on the other surface side of the electrode pressing plate 6.
  • the shape of the electrode pressing plate 6 may be a shape along the shape of the electrode 7.
  • it is a rectangular frame shape (FIGS. 3 and 4) continuous along the entire circumference of the outer peripheral edge portion 70 (FIGS. 5 and 6) of the electrode 7, but is not limited to the frame shape, and the outside of the electrode 7
  • positioned intermittently along the circumferential direction of the peripheral part 70 may be sufficient.
  • the shape of the plate materials is not particularly limited and can be selected as appropriate.
  • the wrap margin Wr of the electrode pressing plate 6 to the electrode 7 can be appropriately selected mainly depending on the type of the electrode 7 described later (FIGS. 5 and 6).
  • the lapping margin Wr refers to the overlapping length of the electrode pressing plate 6 with the electrode 7. The longer the wrapping margin Wr, the wider the contact area between the electrode pressing plate 6 and the electrode 7 and the easier it is to prevent displacement of the electrode 7.
  • the wrap margin Wr corresponding to the type of the electrode 7 will be described later, but is preferably about 5 mm or more, and particularly preferably 8 mm or more.
  • the upper limit of the lapping allowance Wr is 20 mm or less. If so, the cell frame 3 is unlikely to become excessively large. This is because if the area of the region exposed from the electrode pressing plate 6 in the electrode 7 is constant, the cell frame 3 becomes larger as the lapping margin Wr becomes longer.
  • the thickness Pt of the electrode pressing plate 6 is preferably 0.1 mm or greater and 1.0 mm or less. If the thickness Pt of the electrode pressing plate 6 is 0.1 mm or more, the rigidity of the electrode pressing plate 6 can be easily increased. Therefore, it is easy to press the electrode 7 with the electrode pressing plate 6 and to prevent displacement of the electrode 7. If the thickness Pt of the electrode pressing plate 6 is 1.0 mm or less, the gap between the adjacent cell frames 3 is not excessively widened. Therefore, the laminate (cell stack 2) is increased in size, and thus the RF battery 1 Easy to suppress enlargement.
  • the thickness Pt of the electrode pressing plate 6 is more preferably 0.3 mm or more and 0.5 mm or less. In addition, the front and back surfaces of the thickest portion of the outer peripheral edge 50o of the frame 5 and the surface of each electrode pressing plate 6 are flush with each other.
  • the material of the electrode pressing plate 6 includes a material having resistance to the electrolytic solution.
  • Examples of the material of the electrode pressing plate 6 include a plastic material such as vinyl chloride resin, polypropylene, polyethylene, fluorine resin, and epoxy resin, and rubber.
  • the electrode 7 performs a battery reaction as the electrolyte flows.
  • the electrode 7 is disposed inside the recess 30 of the cell frame 3.
  • the shape of the electrode 7 is a rectangular shape along the shape of the recess 30 of the cell frame 3.
  • the size of the electrode 7 is such that the electrode 7 is disposed between the lateral groove portions 43x and 44x of the flow path 42, more specifically, the outer peripheral edge portion 70 is the horizontal flange portion 45y of the flow path 42.
  • the size overlaps with The outer peripheral edge portion 70 of the electrode 7 is sandwiched between the fitting groove portion 41 of the bipolar plate 4 and the electrode facing surface 62 of the electrode pressing plate 6. That is, the size of the electrode 7 is slightly smaller than the outer shape of the fitting groove 41.
  • the repulsive force of the electrode 7 between the electrode pressing plate 6 and the fitting groove 41 is preferably 0.1 MPa or more and 1.0 MPa or less. If the repulsive force of the electrode 7 is 0.1 MPa or more, the bipolar plate 4 and the electrode pressing plate 6 and the electrode 7 can be easily brought into close contact with each other, and the electrode 7 can be prevented from being displaced by being sandwiched between the bipolar plate 4 and the electrode pressing plate 6. It is effective. If the repulsive force of the electrode 7 is 1.0 MPa or less, it is easy to smoothly distribute the electrolytic solution that permeates the electrode 7.
  • the repulsive force of the electrode 7 was compressed from its initial thickness (no load) to a predetermined thickness using a precision universal testing machine Autograph AG-Xplus (AG-10kNX-plus) manufactured by Shimadzu Corporation. It is the surface pressure when.
  • the predetermined thickness is the thickness Et of the outer peripheral edge portion 70 of the electrode 7.
  • the thickness Et of the outer peripheral edge portion 70 of the electrode 7 depends on the type of the electrode 7 and the thickness of the electrode 7 in an uncompressed state before the assembly of the laminate, but is 0.3 mm to 3.0 mm, for example. Especially, 1.0 mm or less is mentioned.
  • the thickness Et of the outer peripheral edge 70 of the electrode 7 here is the thickness of the electrode 7 between the bipolar plate 4 and the electrode pressing plate 6, and means the thickness in the state in which the laminate is assembled. .
  • the thickness of the uncompressed state of the electrode 7 before assembly of the laminate depends on the type and basis weight of the electrode 7, when the electrode 7 is a non-woven fabric, for example, 0.5 mm or more and 5.0 mm or less may be mentioned.
  • the basis weight is 200 g / m 2 or more and 300 g / m 2 or less and the area is “(1000 cm 2 to 3000 cm 2 ) + the area of the wrap allowance Wr”, 1.5 mm or more and 2.0 mm or less can be mentioned.
  • the electrode 7 is a woven fabric, the thickness of the electrode 7 is 0.3 mm or more and 1.0 mm or less, for example.
  • the electrode 7 is paper, the thickness of the electrode 7 is 0.3 mm or more and 1.0 mm or less, for example.
  • Examples of the constituent material of the electrode 7 include non-woven fabric (carbon felt) and woven fabric (carbon cloth) made of carbon fiber, and paper (carbon paper).
  • Examples of the type of the electrode 7 include non-woven fabric, woven fabric, and paper as described above.
  • the depth of the fitting groove 41 of the bipolar plate 4 and the wrap margin of the electrode pressing plate 6 are mainly determined according to the type of the electrode 7. Wr can be selected as appropriate.
  • the electrode 7 is a nonwoven fabric, the depth is preferably, for example, 0.3 mm or more and 2.5 mm or less, and the wrap margin Wr is preferably, for example, 5 mm or more.
  • the basis weight is 200 g / m 2 or more and 300 g / m 2 or less, and the area is “(1000 cm 2 to 3000 cm 2 ) + the area of the lapping allowance Wr”, the depth is 0.00. 3 mm or more and 1.0 mm or less are preferable, and the lapping margin Wr is preferably 8 mm or more.
  • the depth is preferably 0.1 mm or more and 0.5 mm or less, and the wrap margin Wr is preferably 8 mm or more, for example.
  • the electrode 7 is paper, the depth is preferably, for example, 0.3 mm or more and 0.5 mm or less, and the wrap margin Wr is, for example, preferably 5 mm or more.
  • the RF battery 1 according to Embodiment 1 can provide the following effects.
  • the battery cell 100 and the cell stack 2 can be assembled by arranging the electrode 7 in the recess 30 of the cell frame 3 and bringing the cell frame 3 and the electrode 7 together. Therefore, the assembly workability of the RF battery 1 is excellent. Moreover, if the cell frame 3 and the electrode 7 which were put together are supported with the frame body 5 with the electrode pressing plate 6, the battery cell 100 and the cell stack 200 can also be assembled so that the electrode 7 may become down.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Fuel Cell (AREA)

Abstract

Cette plaque bipolaire, comportant une surface sur laquelle une électrode est disposée, a une rainure d'ajustement qui est formée dans la surface susmentionnée et dans laquelle un bord périphérique externe de l'électrode est ajusté.
PCT/JP2017/001825 2017-01-19 2017-01-19 Plaque bipolaire, cadre de cellule et empilement de cellules, et batterie à flux redox WO2018134955A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2017/001825 WO2018134955A1 (fr) 2017-01-19 2017-01-19 Plaque bipolaire, cadre de cellule et empilement de cellules, et batterie à flux redox

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2017/001825 WO2018134955A1 (fr) 2017-01-19 2017-01-19 Plaque bipolaire, cadre de cellule et empilement de cellules, et batterie à flux redox

Publications (1)

Publication Number Publication Date
WO2018134955A1 true WO2018134955A1 (fr) 2018-07-26

Family

ID=62909048

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2017/001825 WO2018134955A1 (fr) 2017-01-19 2017-01-19 Plaque bipolaire, cadre de cellule et empilement de cellules, et batterie à flux redox

Country Status (1)

Country Link
WO (1) WO2018134955A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109546178A (zh) * 2018-11-27 2019-03-29 杭州电子科技大学温州研究院有限公司 一种肠形流场板及包括该流场板的燃料电池
CN113348572A (zh) * 2019-02-14 2021-09-03 住友电气工业株式会社 双极板、电池框架、电池组及氧化还原液流电池

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002367659A (ja) * 2001-06-12 2002-12-20 Sumitomo Electric Ind Ltd レドックスフロー電池用セルフレーム及びレドックスフロー電池
JP2006351423A (ja) * 2005-06-17 2006-12-28 Toyota Motor Corp 燃料電池
WO2016159348A1 (fr) * 2015-04-01 2016-10-06 昭和電工株式会社 Matériau d'électrode, électrode d'une batterie à flux redox et batterie à flux redox

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002367659A (ja) * 2001-06-12 2002-12-20 Sumitomo Electric Ind Ltd レドックスフロー電池用セルフレーム及びレドックスフロー電池
JP2006351423A (ja) * 2005-06-17 2006-12-28 Toyota Motor Corp 燃料電池
WO2016159348A1 (fr) * 2015-04-01 2016-10-06 昭和電工株式会社 Matériau d'électrode, électrode d'une batterie à flux redox et batterie à flux redox

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109546178A (zh) * 2018-11-27 2019-03-29 杭州电子科技大学温州研究院有限公司 一种肠形流场板及包括该流场板的燃料电池
CN113348572A (zh) * 2019-02-14 2021-09-03 住友电气工业株式会社 双极板、电池框架、电池组及氧化还原液流电池

Similar Documents

Publication Publication Date Title
KR102272748B1 (ko) 쌍극판, 셀 프레임, 셀 스택, 및 레독스 플로우 전지
US10593964B2 (en) Bipolar plate, cell frame, cell stack and redox-flow battery
JP6099005B2 (ja) 電池セル、およびレドックスフロー電池
WO2016072254A1 (fr) Batterie à circulation d'électrolyte
JP6738052B2 (ja) セルフレーム、セルスタック、及びレドックスフロー電池
JP2017027663A (ja) レドックスフロー電池
WO2018134955A1 (fr) Plaque bipolaire, cadre de cellule et empilement de cellules, et batterie à flux redox
JP6970388B2 (ja) レドックスフロー電池用電極、レドックスフロー電池セル及びレドックスフロー電池
WO2017134780A1 (fr) Batterie à flux redox
US11769886B2 (en) Battery cell, cell stack, and redox flow battery
JP2019029106A (ja) セルフレーム、セルスタック、およびレドックスフロー電池
AU2016432005B2 (en) Frame body, cell frame, cell stack, and redox flow battery
JP6908031B2 (ja) レドックスフロー電池セル、レドックスフロー電池セルスタック、及びレドックスフロー電池
WO2018092216A1 (fr) Châssis de cellules, empilement de cellules, et batterie à flux redox
US11811105B2 (en) Battery cell, cell stack, and redox flow battery
JP2020129502A (ja) 電池セル、セルスタック、及びレドックスフロー電池
WO2019234867A1 (fr) Plaque bipolaire, cadre de cellule, empilement de cellules et batterie à flux redox
JP2020173892A (ja) 双極板、電池セル、セルスタック、およびレドックスフロー電池
WO2018134927A1 (fr) Plaque bipolaire, châssis de cellule, empilement de cellules et batterie à flux rédox

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 17892607

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 17892607

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP