WO2018105092A1 - 枠体、セルフレーム、セルスタック、及びレドックスフロー電池 - Google Patents
枠体、セルフレーム、セルスタック、及びレドックスフロー電池 Download PDFInfo
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- WO2018105092A1 WO2018105092A1 PCT/JP2016/086644 JP2016086644W WO2018105092A1 WO 2018105092 A1 WO2018105092 A1 WO 2018105092A1 JP 2016086644 W JP2016086644 W JP 2016086644W WO 2018105092 A1 WO2018105092 A1 WO 2018105092A1
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- negative electrode
- frame
- positive electrode
- slit
- electrolyte
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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
- H01M8/0273—Sealing or supporting means around electrodes, matrices or membranes with sealing or supporting means in the form of a frame
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04186—Arrangements for control of reactant parameters, e.g. pressure or concentration of liquid-charged or electrolyte-charged reactants
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/18—Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells
- H01M8/184—Regeneration by electrochemical means
- H01M8/188—Regeneration by electrochemical means by recharging of redox couples containing fluids; Redox flow type batteries
-
- 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
- H01M8/2455—Grouping of fuel cells, e.g. stacking of fuel cells with liquid, solid or electrolyte-charged reactants
-
- 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 frame, a cell frame, a cell stack, and a redox flow battery.
- redox flow batteries As one of large-capacity storage batteries, redox flow batteries (hereinafter sometimes referred to as “RF batteries”) are known (see Patent Documents 1 to 3).
- the redox flow battery uses a cell stack in which a plurality of cell frames, positive electrodes, diaphragms, and negative electrodes are stacked.
- the cell frame includes a bipolar plate disposed between the positive electrode and the negative electrode, and a frame provided around the bipolar plate.
- positive and negative electrodes are arranged between bipolar plates of adjacent cell frames with a diaphragm interposed therebetween, thereby forming one cell.
- charging and discharging are performed by circulating and circulating positive and negative electrolytes through positive and negative electrodes, respectively.
- Patent Documents 1 to 3 a positive electrode electrolyte channel provided on one side of the frame and through which the positive electrode electrolyte flows, and a negative electrode electrolyte provided on the other side of the frame and through which the negative electrode electrolyte flows.
- a cell frame provided with a flow channel is disclosed.
- the flow path for the positive electrode electrolyte and the flow path for the negative electrode electrolyte are the supply slits for the positive electrode and the negative electrode that supply the respective electrolytes to the respective electrodes, and the positive electrode and the negative electrode that discharge the respective electrolytes from the respective electrodes.
- a drainage slit the cell frame has a positive and negative supply manifold through which each electrolyte supplied to each electrode flows, and a positive and negative supply through which each electrolyte discharged from each electrode flows.
- the drainage manifold is provided through the frame.
- JP 2013-80613 A Japanese Patent Laid-Open No. 2002-246061 JP 2005-228622 A
- the frame of the present disclosure is: A frame provided around a bipolar plate disposed between a positive electrode and a negative electrode of a redox flow battery,
- the frame is A positive electrode supply manifold which is provided through the frame and through which a positive electrolyte supplied to the positive electrode flows; and a positive electrode discharge manifold through which a positive electrolyte discharged from the positive electrode flows;
- a positive electrode liquid supply slit that is provided on one surface side of the frame body and has an inlet portion that opens to the inside of the frame body, and supplies a positive electrode electrolyte from the positive electrode liquid supply manifold to the positive electrode;
- the frame A positive electrode electrolyte flow path comprising an outlet portion that opens inside the body, and a positive electrode drain slit that discharges the positive electrolyte from the positive electrode to the positive electrode drain manifold;
- a negative electrode liquid supply manifold that passes through the frame and through which a negative electrode electrolyte supplied to the negative electrode flows; and a negative electrode drainage
- a negative electrode liquid supply slit provided on the other surface side of the frame body, having an inlet portion opening inside the frame body, for supplying a negative electrode electrolyte from the negative electrode liquid supply manifold to the negative electrode;
- a negative electrode electrolyte flow path having an outlet portion opened inside the frame body, and a negative electrode drain slit for discharging the negative electrode electrolyte from the negative electrode to the negative electrode drain manifold.
- At least one of the set of the inlet portions of the positive electrode liquid supply slit and the negative electrode liquid supply slit and the set of the outlet portions of the positive electrode drain slit and the negative electrode drain slit. Are provided so as to partially overlap each other in the thickness direction of the frame.
- the cell frame of the present disclosure includes the frame body of the present disclosure and the bipolar plate provided inside the frame body.
- the cell stack of the present disclosure includes the cell frame of the present disclosure.
- a cell stack of the present disclosure is A cell stack comprising a cell frame having a bipolar plate disposed between a positive electrode and a negative electrode of a redox flow battery, and a frame provided around the bipolar plate,
- the frame is A positive electrode supply manifold which is provided through the frame and through which a positive electrolyte supplied to the positive electrode flows; and a positive electrode discharge manifold through which a positive electrolyte discharged from the positive electrode flows;
- a positive electrode liquid supply slit that is provided on one surface side of the frame body and has an inlet portion that opens to the inside of the frame body, and supplies a positive electrode electrolyte from the positive electrode liquid supply manifold to the positive electrode; and the frame A positive electrode electrolyte flow path comprising an outlet portion that opens inside the body, and a positive electrode drain slit that discharges the positive electrolyte from the positive electrode to the positive electrode drain manifold;
- a negative electrode liquid supply manifold that passes through the frame and through which a negative electrode electro
- a negative electrode liquid supply slit provided on the other surface side of the frame body, having an inlet portion opening inside the frame body, for supplying a negative electrode electrolyte from the negative electrode liquid supply manifold to the negative electrode;
- a negative electrode electrolyte flow path having an outlet portion opened inside the frame body, and a negative electrode drain slit for discharging the negative electrode electrolyte from the negative electrode to the negative electrode drain manifold.
- the set of the inlet portions of the positive electrode liquid supply slit and the negative electrode liquid supply slit and the set of the outlet portions of the positive electrode drain slit and the negative electrode drain slit are the frame body.
- the positive electrode liquid supply slit provided on one surface side of the one frame body
- the inlet portion and the outlet portion of the positive electrode drain slit, the inlet portion of the negative electrode liquid supply slit provided on the other surface side of the other frame, and the outlet portion of the negative electrode drain slit. are provided so as to partially overlap each other in the stacking direction.
- the redox flow battery of the present disclosure includes the cell stack of the present disclosure.
- FIG. 6 is a view taken in the direction of arrows VIa-VIa in FIG. 4.
- FIG. 6 is a view taken in the direction of arrows VIb-VIb in FIG. 4.
- FIG. 6 is a view taken in the direction of arrows VIb-VIb in FIG. 4.
- FIG. 3 is a schematic diagram showing a positional relationship between an inlet portion of a positive electrode liquid supply slit and an inlet portion of a negative electrode liquid supply slit when the cell frames according to Embodiment 1 are stacked. It is a schematic diagram which shows the positional relationship of the exit part of the drainage slit for positive electrodes, and the exit part of the drainage slit for negative electrodes when the cell frame which concerns on Embodiment 1 is laminated
- FIG. 9 is a view taken along line IXa-IXa in FIG.
- FIG. 9 is a view taken along the line IXb-IXb in FIG. 8.
- FIG. 6 is a schematic diagram showing a positional relationship between an inlet portion of a positive electrode liquid supply slit and an inlet portion of a negative electrode liquid supply slit in adjacent cell frames in a cell stack according to Embodiment 2.
- FIG. 6 is a schematic diagram showing a positional relationship between an outlet portion of a positive electrode drain slit and an outlet portion of a negative electrode drain slit in adjacent cell frames in a cell stack according to Embodiment 2.
- the electrolyte in a charged state is placed in each of the positive and negative electrode slits (liquid supply slit and drainage slit) constituting the positive electrode electrolyte flow path and the negative electrode electrolyte flow path.
- a shunt current flows through the electrolyte in each slit, and a loss due to the shunt current (shunt current loss) occurs. Due to the shunt current, the electrolytic solution generates heat, and the temperature of the electrolytic solution may increase. In some cases, a temperature difference may be generated between the positive and negative electrode electrolytes.
- the temperature of the electrolytic solution is likely to rise in the slit as compared with the operation in which the electrolytic solution is circulated.
- the temperature of the electrolytic solution rises, precipitates may be generated in the electrolytic solution, which may lead to a decrease in battery performance such as deterioration of the electrolytic solution.
- the frame body may be deformed such as warpage, and the frame body (cell frame) may be damaged. Therefore, it is desired to suppress the temperature rise of both electrolyte solutions while equalizing the temperature of both electrolyte solutions in each slit through which positive and negative electrolyte solutions circulate.
- the one surface side and the other surface side of adjacent cell frame frames face each other and face each other.
- On the one surface side (front surface side) and the other surface side (back surface side) of the frame body there are provided respective slits for the positive electrode and the negative electrode constituting the positive electrode electrolyte channel and the negative electrode electrolyte channel.
- the positive electrode slit provided on one side of one frame faces the other side of the other frame, and on the other side of the other frame.
- the provided negative electrode slit faces one surface of one frame.
- the slits for the positive electrode and the negative electrode are usually formed in substantially the same pattern on the front and back.
- the opening (inlet part or outlet part) that opens to the inside of the frame body in the positive electrode slit and the opening part that opens to the inside of the frame body in the negative electrode slit are the same position (that is, the frame body)
- a cell stack is formed using cell frames provided at positions overlapping in the thickness direction.
- the opening of the positive electrode slit provided on one side of one frame and the opening of the negative electrode slit provided on the other side of the other frame are mutually connected. It will be in a state of dating.
- the frame according to the embodiment is A frame provided around a bipolar plate disposed between a positive electrode and a negative electrode of a redox flow battery,
- the frame is A positive electrode supply manifold which is provided through the frame and through which a positive electrolyte supplied to the positive electrode flows; and a positive electrode discharge manifold through which a positive electrolyte discharged from the positive electrode flows;
- a positive electrode liquid supply slit that is provided on one surface side of the frame body and has an inlet portion that opens to the inside of the frame body, and supplies a positive electrode electrolyte from the positive electrode liquid supply manifold to the positive electrode;
- the frame A positive electrode electrolyte flow path comprising an outlet portion that opens inside the body, and a positive electrode drain slit that discharges the positive electrolyte from the positive electrode to the positive electrode drain manifold;
- a negative electrode liquid supply manifold that passes through the frame and through which a negative electrode electrolyte supplied to the negative electrode flows; and a negative electrode drainage man
- a negative electrode liquid supply slit provided on the other surface side of the frame body, having an inlet portion opening inside the frame body, for supplying a negative electrode electrolyte from the negative electrode liquid supply manifold to the negative electrode;
- a negative electrode electrolyte flow path having an outlet portion opened inside the frame body, and a negative electrode drain slit for discharging the negative electrode electrolyte from the negative electrode to the negative electrode drain manifold.
- At least one of the set of the inlet portions of the positive electrode liquid supply slit and the negative electrode liquid supply slit and the set of the outlet portions of the positive electrode drain slit and the negative electrode drain slit. Are provided so as to partially overlap each other in the thickness direction of the frame.
- At least one set of openings (inlet part and outlet part) of each slit for the positive electrode and the negative electrode is provided so as to partially overlap each other in the thickness direction of the frame body.
- Partially overlap each other in the thickness direction of the frame means that in the thickness direction of the frame when viewed in perspective from the thickness direction of the frame (direction from one surface to the other surface). It means that a part overlaps and it has shifted
- At least one set of openings (inlet part and outlet part) of the slits for the positive electrode and the negative electrode is shifted in the circumferential direction when viewed from the thickness direction of the frame body, so that the frame body is
- the respective openings are not brought into contact with each other. For this reason, it is possible to avoid the concentration of surface pressure at the corners of the respective openings, so that breakage such as chipping is unlikely to occur at the corners. Further, by avoiding the concentration of surface pressure at the corners of the opening, it is possible to suppress damage to the diaphragm interposed between the adjacent frames. Therefore, the frame body can suppress the temperature rise of both electrolyte solutions while making the temperature of the positive and negative electrolyte solutions uniform, and can suppress the breakage of the frame body when the cell stack is configured. Reliability and performance can be improved.
- a set of the inlet portions of the positive electrode liquid supply slit and the negative electrode liquid supply slit, and the positive electrode liquid discharge slit and the negative electrode liquid discharge slit In at least one of the sets of the outlet portions, the overlapping range in the thickness direction of the frame body may be 10% or more and 99% or less of each opening width.
- overlapping ranges overlapping each other in the thickness direction of the frame body are 10% or more of the respective opening widths. It is easy to ensure heat conduction from the high temperature side electrolyte to the low temperature side electrolyte. Therefore, it is possible to effectively equalize the temperature of the positive and negative electrolyte solutions, increase the cooling efficiency of the electrolyte solution on the high temperature side, and further suppress the temperature rise of the electrolyte solution. Moreover, it is easy to ensure the shift
- the lower limit of the overlapping range is preferably 20% or more, 30% or more, and further 50% or more of each opening width, and the upper limit is 95% or less, and further 90% of each opening width. The following is preferable.
- a cell frame according to the embodiment includes the frame described in the above (1) or (2) and the bipolar plate provided inside the frame.
- the frame according to the embodiment described above since the frame according to the embodiment described above is included, the reliability and performance of the redox flow battery can be improved.
- a cell stack according to the embodiment includes the cell frame described in (3) above.
- the reliability and performance of the redox flow battery can be improved.
- a cell stack is: A cell stack comprising a cell frame having a bipolar plate disposed between a positive electrode and a negative electrode of a redox flow battery, and a frame provided around the bipolar plate,
- the frame is A positive electrode supply manifold which is provided through the frame and through which a positive electrolyte supplied to the positive electrode flows; and a positive electrode discharge manifold through which a positive electrolyte discharged from the positive electrode flows;
- a positive electrode liquid supply slit that is provided on one surface side of the frame body and has an inlet portion that opens to the inside of the frame body, and supplies a positive electrode electrolyte from the positive electrode liquid supply manifold to the positive electrode; and the frame A positive electrode electrolyte flow path comprising an outlet portion that opens inside the body, and a positive electrode drain slit that discharges the positive electrolyte from the positive electrode to the positive electrode drain manifold;
- a negative electrode liquid supply manifold that passes through the frame and through which a negative electrode electrolyt
- a negative electrode liquid supply slit provided on the other surface side of the frame body, having an inlet portion opening inside the frame body, for supplying a negative electrode electrolyte from the negative electrode liquid supply manifold to the negative electrode;
- a negative electrode electrolyte flow path having an outlet portion opened inside the frame body, and a negative electrode drain slit for discharging the negative electrode electrolyte from the negative electrode to the negative electrode drain manifold.
- the set of the inlet portions of the positive electrode liquid supply slit and the negative electrode liquid supply slit and the set of the outlet portions of the positive electrode drain slit and the negative electrode drain slit are the frame body.
- the positive electrode liquid supply slit provided on one surface side of the one frame body
- the inlet portion and the outlet portion of the positive electrode drain slit, the inlet portion of the negative electrode liquid supply slit provided on the other surface side of the other frame, and the outlet portion of the negative electrode drain slit. are provided so as to partially overlap each other in the stacking direction.
- a set of openings (inlet part and outlet part) of the positive and negative electrode slits is provided so as to overlap each other in the thickness direction of the frame body.
- “Overlapping each other in the thickness direction of the frame” means that they overlap at substantially the same position when seen in perspective from the thickness direction of the frame (the direction from one surface to the other). Means that.
- the overlapping range in the thickness direction of the frame body may be over 90% and 100% or less of the respective opening widths.
- the lower limit of the overlapping range in the thickness direction of the set of openings of the positive and negative electrode slits exceeds 95% of the respective opening width, Preferably it is over 99%.
- the cell stack is configured by stacking a plurality of cell frames, and one surface side and the other surface side of the frame body of adjacent cell frames are in a state of facing each other.
- openings (inlet part and outlet part) of each slit for positive electrode provided on one surface side of each, and each for negative electrode provided on the other surface side of the other side The slit openings are provided so as to partially overlap each other in the stacking direction. “Partially overlap each other in the stacking direction” means that a part of the cell frame overlaps in the stacking direction and is shifted in the circumferential direction of the frame when viewed from the stacking direction of the cell frame.
- the opening of each slit for one positive electrode and the opening of each slit for the other negative electrode are shifted in the circumferential direction when viewed from the stacking direction.
- the respective openings are not brought into contact with each other. For this reason, it is possible to avoid the concentration of surface pressure at the corners of the respective openings, so that breakage such as chipping is unlikely to occur at the corners. Further, by avoiding the concentration of surface pressure at the corners of the opening, it is possible to suppress damage to the diaphragm interposed between the adjacent frames. Therefore, the cell stack can suppress damage to the frame (cell frame) and the like while suppressing the temperature rise of both electrolytes while making the temperature of the positive and negative electrolytes uniform. The performance can be improved.
- an opening of each slit for positive electrode provided on one surface side of one frame body of an adjacent cell frame, and an opening of each slit for negative electrode provided on the other surface side of the other frame body examples include, for example, 10% to 99% of the respective opening widths.
- the above-mentioned in the stacking direction of the opening of each slit for positive electrode provided on one surface side and the opening of each slit for negative electrode provided on the other surface side of the other The lower limit of the overlapping range is preferably 20% or more, 30% or more, and more preferably 50% or more of each opening width, and the upper limit is preferably 95% or less and further 90% or less of each opening width. .
- a redox flow battery according to the embodiment includes the cell stack described in (4) or (5) above.
- the reliability is high and the battery performance is excellent.
- the RF battery 1 uses an electrolytic solution containing, as an active material, a metal ion whose valence changes as a result of oxidation and reduction 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 It is a battery that charges and discharges using the difference between the redox potential of ions contained in the liquid.
- group RF battery which uses the vanadium electrolyte solution containing V ion used as an active material for the positive electrode electrolyte solution and the negative electrode electrolyte solution is shown as an example of the RF battery 1.
- a solid line arrow in the cell 100 in FIG. 1 indicates a charging reaction, and a broken line arrow indicates a discharging reaction.
- 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 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 104 is built in the positive electrode cell 102, and a positive electrode electrolyte solution tank 106 for storing the positive electrode electrolyte is connected via conduits 108 and 110.
- the conduit 108 is provided with a pump 112 that pumps the positive electrode electrolyte to the positive electrode cell 102, and a positive electrode circulation mechanism 100 ⁇ / b> P that circulates the positive electrode electrolyte is constituted by these members 106, 108, 110, and 112. .
- the negative electrode cell 103 contains a negative electrode 105 and is connected to a negative electrode electrolyte tank 107 for storing a negative electrode electrolyte via conduits 109 and 111.
- the conduit 109 is provided with a pump 113 for pumping the negative electrode electrolyte to the negative electrode cell 103, and a negative electrode circulation mechanism 100N for circulating the negative electrode electrolyte is constituted by these members 107, 109, 111, 113. .
- the electrolytes stored in the tanks 106 and 107 are circulated in the cell 100 (the positive electrode cell 102 and the negative electrode cell 103) by the pumps 112 and 113 at the time of charging and discharging, and at the time of standby without charging and discharging. Pumps 112 and 113 are stopped and not circulated.
- the cell 100 is usually formed inside a structure called a cell stack 2 as shown in FIGS.
- the cell stack 2 is configured by sandwiching a laminate called a sub stack 200 (see FIG. 3) from two sides with two end plates 220 and fastening the end plates 220 on both sides with a fastening mechanism 230 (see FIG. 3 includes a plurality of sub-stacks 200).
- the sub stack 200 is formed by stacking a plurality of cell frames 3, positive electrodes 104, diaphragms 101, and negative electrodes 105, and supply / discharge plates 210 (see the lower figure in FIG. 3, omitted in FIG. 2) at both ends of the laminated body. It is an arranged configuration.
- the cell frame 3 includes a bipolar plate 31 disposed between the positive electrode 104 and the negative electrode 105, and a frame body 32 provided around the bipolar plate 31.
- the positive electrode 104 is disposed on one surface side of the bipolar plate 31 and the negative electrode 105 is disposed on the other surface side of the bipolar plate 31.
- a bipolar plate 31 is provided inside the frame 32, and the positive electrode 104 and the negative electrode 105 are accommodated with the bipolar plate 31 interposed therebetween.
- the sub stack 200 (cell stack 2), one cell 100 is formed between the bipolar plates 31 of each adjacent cell frame 3, and one surface side of the frame 32 of each adjacent cell frame 3 and It will be in the state where the other surface side faced each other.
- the bipolar plate 31 is made of, for example, plastic carbon, and the frame body 32 is made of, for example, plastic such as vinyl chloride resin (PVC), polypropylene, polyethylene, fluorine resin, or epoxy resin.
- PVC vinyl chloride resin
- the bipolar plate 31 is formed by a known method such as injection molding, press molding, or vacuum molding.
- a frame 32 is integrated around the bipolar plate 31 by injection molding or the like.
- the frame 32 includes liquid supply manifolds 33 and 34 through which the positive and negative electrode electrolytes supplied to the positive electrode 104 and the negative electrode 105, and the electrolytes discharged from the electrodes. Drain manifolds 35 and 36 through which liquid flows are provided.
- the frame 32 is supplied with slits 33 s and 34 s for supplying the electrolyte from the supply manifolds 33 and 34 to the electrodes, and the electrolyte is discharged from the electrodes to the drain manifolds 35 and 36. Drain slits 35s and 36s are provided.
- Distribution of each positive and negative electrolyte solution to the positive electrode 104 and the negative electrode 105 is performed through a supply / discharge plate 210 (see the lower diagram in FIG. 3) and a supply manifold provided through the frame 32 shown in FIG. 33, 34 and drainage manifolds 35, 36, and liquid supply slits 33s, 34s and drainage slits 35s, 36s provided on one side and the other side of the frame 32 (FIGS. 4 and 5 are also shown). See also).
- the liquid supply manifold 33 and the drainage manifold 35 are manifolds through which the positive electrode electrolyte flows.
- the liquid supply manifold 33 is a positive electrode liquid supply manifold through which a positive electrode electrolyte supplied to the positive electrode 104 flows
- the drainage manifold 35 is a positive electrode through which the positive electrode electrolyte discharged from the positive electrode 104 flows.
- This is a drainage manifold.
- the liquid supply manifold 34 and the drainage manifold 36 are manifolds through which the negative electrode electrolyte flows.
- the liquid supply manifold 34 is a negative electrode liquid supply manifold through which the negative electrode electrolyte supplied to the negative electrode 105 flows
- the drainage manifold 36 is a negative electrode through which the negative electrode electrolyte discharged from the negative electrode 105 flows. This is a drainage manifold.
- a liquid supply slit 33s and a liquid discharge slit 35s provided on one surface side (front surface side) of the frame 32 shown in FIG. 4 are slits constituting the positive electrode electrolyte flow path 32p.
- the liquid supply slit 33 s is a positive electrode liquid supply slit that supplies a positive electrode electrolyte from the positive electrode liquid supply manifold 33 to the positive electrode 104, and the drainage slit 35 s is from the positive electrode 104 to the positive electrode liquid discharge manifold 35.
- a positive electrode drain slit for discharging the positive electrode electrolyte.
- the positive electrode liquid supply slit 33 s has an inlet portion 33 i that opens to the inside of the frame body 32, and the positive electrode drainage slit 35 s has an outlet portion 35 o that opens to the inside of the frame body 32.
- the liquid supply slit 34s and the drainage slit 36s provided on the other surface side (back surface side) of the frame 32 shown in FIG. 5 are slits constituting the negative electrode electrolyte flow path 32n.
- the liquid supply slit 34 s is a negative electrode liquid supply slit that supplies the negative electrode electrolyte from the negative electrode supply manifold 34 to the negative electrode 105
- the drainage slit 35 s is from the negative electrode 105 to the negative electrode drain manifold.
- a negative electrode drain slit 36 discharges the negative electrode electrolyte.
- the negative electrode liquid supply slit 34 s has an inlet 34 i that opens inside the frame 32, and the negative electrode drain slit 36 s has an outlet 36 o that opens inside the frame 32.
- the positive electrode liquid supply slit 33 s and the negative electrode liquid supply slit 34 s have substantially the same shape, length, width, and depth, and the positive electrode liquid discharge slit 35 s and the negative electrode liquid supply slit 36 s are the same.
- the slit shape, length, width and depth are substantially the same.
- each slit is, for example, 0.5 mm or more and 10 mm or less, further 1.0 mm or more and 5.0 mm or less, and 10% or more of the thickness of the frame body 32 from the viewpoint of ensuring the mechanical strength of the frame body 32. Satisfying about 45% or less.
- the width of each slit satisfies 0.5 mm or more and 20 mm or less, and further satisfies 1.0 mm or more and 8.0 mm or less.
- the cross-sectional shape orthogonal to the length direction of each slit is rectangular, but not limited to this, the cross-sectional shape of each slit is, for example, triangular, trapezoidal, semicircular, semielliptical, etc. There may be.
- the positive electrode electrolyte is supplied from the liquid supply manifold 33 through the liquid supply slit 33s formed in the lower part of the frame body 32 as shown in FIG. 104 (see FIG. 3) and discharged to the drainage manifold 35 through the drainage slit 35s formed in the upper part of the frame 32.
- the negative electrode electrolyte is supplied from the liquid supply manifold 34 to the negative electrode 105 (see FIG. 3) via the liquid supply slit 34 s formed in the lower portion of the frame 32, and the frame body. The liquid is discharged to the drainage manifold 36 through the drainage slit 36 s formed in the upper part of 32.
- a rectifying portion may be formed along the edge on the inner lower edge and the inner upper edge of the frame body 32.
- the rectifying unit diffuses each electrolytic solution supplied from the liquid supply slits 33 s and 34 s along the lower edge portion of each electrode, or discharges each electrolytic solution discharged from the upper edge portion of each electrode to the drain slits 35 s, It has the function of consolidating to 36s.
- annular seal member 37 (see FIGS. 2 and 3) such as an O-ring and a flat packing is disposed between the frame bodies 32 of each cell frame 3 in order to suppress leakage of the electrolytic solution.
- the frame body 32 is formed with a seal groove 38 (see FIGS. 4 and 5) for disposing the seal member 37.
- One of the features of the frame body 32 according to the embodiment is that a pair of inlet portions 33i and 34i of a positive electrode liquid supply slit 33s and a negative electrode liquid supply slit 34s, and a positive electrode liquid discharge slit 35s and a negative electrode discharge slit. At least one pair of the outlet portions 35o and 36o with the liquid slit 36s is provided so as to partially overlap each other in the thickness direction of the frame body 32.
- the frame 32 (cell frame 3) according to the first embodiment and the cell stack 2 including the cell frame 3 will be described in detail with reference to FIGS.
- the frame body 32 of the cell frame 3 shown in FIGS. 4 and 5 includes an inlet portion 33i of the positive electrode liquid supply slit 33s and an inlet portion 34i of the negative electrode liquid supply slit 34s. Are positioned so as to partially overlap each other in the thickness direction.
- the frame body 32 of the cell frame 3 includes an outlet portion 35o of the positive electrode drain slit 35s and an outlet portion 36o of the negative electrode drain slit 36s. Are positioned so as to partially overlap each other in the thickness direction. Therefore, in the cell frame 3 according to the first embodiment, the pair of the inlet portions 33i and 34i and the pair of the outlet portions 35o and 36o are provided so as to partially overlap each other in the thickness direction of the frame body 32. ing.
- the pair of the inlet portions 33i and 34i partially overlap in the thickness direction of the frame 32, so that the positive electrode electrolyte and the negative electrode supply slit 34s flowing through the positive electrode supply slit 33s.
- the heat conduction is efficiently performed between the negative electrode electrolyte flowing in the pipe.
- the pair of the outlet portions 35o and 36o partially overlaps in the thickness direction of the frame 32, so that the positive electrode electrolyte and the negative electrode drain liquid flowing through the positive electrode drain slit 35s. Heat conduction is efficiently performed between the negative electrode electrolyte flowing through the slit 36s.
- the one surface side and the other surface side of the frame body 32 of the adjacent cell frame 3 are mutually connected. Laminated opposite to each other.
- the pair of the inlet portions 33i and 34i is shifted in the circumferential direction when viewed from the thickness direction of the frame body 32, and as shown in FIG. 7A, the corner portions of the inlet portions 33i and 34i (the circles in FIG. 7A).
- the part enclosed by is not in a state of being attached to each other. Therefore, it is possible to avoid the surface pressure from being concentrated on the corners of the inlet portions 33i and 34i.
- the pair of the outlet portions 35o, 36o is shifted in the circumferential direction when viewed from the thickness direction of the frame body 32, and as shown in FIG. 7B, the corner portions of the outlet portions 35o, 36o (in FIG. 7B).
- the parts surrounded by circles) are not attached to each other. Therefore, it can avoid that surface pressure concentrates on the corner
- the overlapping range Li in the thickness direction of the frame body 32 satisfies 10% or more and 99% or less of the opening width Wi.
- the overlapping range Lo overlapping each other in the thickness direction of the frame 32 is 10% or more and 99% or less of the opening width Wo. Satisfying.
- the overlapping range Li of the set of the inlet portions 33i and 34i and the overlapping range Lo of the set of the outlet portions 35o and 36o are represented by 0.1 Wi ⁇ Li ⁇ 0.99 Wi and 0.1 Wo ⁇ Lo ⁇ 0.99 Wo, respectively.
- the inlet portions 33i and 34i of the liquid supply slits 33s and 34s for the positive electrode and the negative electrode (the outlet portions 35o of the drain slits 35s and 36s, 36o)
- Wi opening width
- the inlet portions 33i and 34i of the liquid supply slits 33s and 34s for the positive electrode and the negative electrode (the outlet portions 35o of the drain slits 35s and 36s, 36o)
- the overlapping range Li (Lo) satisfies 99% or less of the opening width Wi (Wo), it is easy to ensure the deviation of the corners of the inlet portions 33i and 34i (outlet portions 35o and 36o), and Damage can be effectively suppressed.
- the overlapping ranges Li and Lo are preferably 20% or more, 30% or more, and further 50% or more of the opening widths Wi and Wo, respectively, preferably 95% or less, and further 90% or less. Is preferred.
- the frame 32 according to the first embodiment has the following effects.
- the cell frame 3 when the cell frame 3 is laminated
- each of the pairs of the inlet portions 33i and 34i and the outlet portions 35o and 36o is provided so as to partially overlap each other in the thickness direction of the frame body 32.
- only the pair of the inlet portions 33i and 34i may be provided so as to partially overlap, or only the pair of the outlet portions 35o and 36o may be provided so as to partially overlap. Good.
- FIG. 1 a cell stack 2 according to another embodiment will be described with reference to FIGS. Below, it demonstrates centering around difference with Embodiment 1, and the description is abbreviate
- FIG. One feature of the cell stack 2 according to the second embodiment is that, as shown in FIGS. 8 and 9, in the frame body 32 of each cell frame 3 constituting the cell stack 2, the positive electrode supply slit 33 s and the negative electrode The pair of inlet portions 33i and 34i with the liquid supply slit 34s and the pair of outlet portions 35o and 36o of the positive electrode drain slit 35s and the negative electrode drain slit 36s are in the thickness direction of the frame 32.
- the inlet portion of the positive electrode liquid supply slit 33 s provided on one surface side of one frame 32 in the adjacent cell frames 3. 33i and an outlet portion 35o of the positive electrode drain slit 35s, an inlet portion 34i of the negative electrode liquid supply slit 34s provided on the other surface side of the other frame 32, and an outlet portion 36o of the negative electrode drain slit 36s. are provided so as to partially overlap each other in the stacking direction.
- the inlet portion 33i of the positive electrode liquid supply slit 33s and the inlet portion 34i of the negative electrode liquid supply slit 34s are positioned so as to overlap each other in the thickness direction of the frame body 32.
- the outlet 35o of the positive electrode drain slit 35s and the outlet 36o of the negative drain slit 36s of the frame 32 overlap with each other in the thickness direction of the frame 32. Is located.
- the pair of the inlet portions 33i and 34i and the pair of the outlet portions 35o and 36o are mutually connected in the thickness direction of the frame body 32. It is provided to overlap.
- the pair of inlet portions 33i and 34i overlap in the thickness direction of the frame body 32, so that the positive electrode electrolyte and the negative electrode supply slit 34s circulate in the positive electrode supply slit 33s. Heat conduction is efficiently performed with the negative electrode electrolyte.
- the pair of the outlet portions 35o and 36o overlaps in the thickness direction of the frame body 32, so that the positive electrode electrolyte and the negative electrode drain slit 36s circulate in the positive electrode drain slit 35s. Heat conduction is efficiently performed between the flowing negative electrode electrolyte.
- the pair of the inlet portions 33i and 34i and the pair of the outlet portions 35o and 36o are overlapped at substantially the same position when seen in perspective from the thickness direction of the frame 32 as shown in FIG. Is provided.
- the overlapping range Li in the thickness direction of the frame 32 satisfies 90% to 100% or less of the opening width Wi.
- the overlapping range Lo that overlaps each other in the thickness direction of the frame 32 is more than 90% of the opening width Wo and not more than 100%. Satisfying.
- the overlapping ranges Li and Lo are preferably more than 95% and more than 99% of the opening widths Wi and Wo, respectively.
- a plurality of cell frames 3 are stacked while being shifted from each other.
- the inlet 34i of the negative electrode supply slit 34s provided on the surface side is provided so as to partially overlap each other in the stacking direction.
- an outlet 35o of the positive electrode drain slit 35s provided on one surface side and an outlet 36o of the negative electrode drain slit 36s provided on the other surface side are provided. They are provided so as to partially overlap each other in the stacking direction.
- the inlet portion 33 i and the outlet portion 35 o provided on one surface side and the other surface side of the other side.
- the inlet part 34i and the outlet part 36o provided on the outer periphery are shifted in the circumferential direction as seen from the stacking direction. Therefore, the corner portions (portions surrounded by circles in FIG. 10A) of the inlet portions 33i and 34i and the corner portions (portions surrounded by circles in FIG. 10B) of the outlet portions 35o and 36o are attached to each other. Don't be.
- Lx may satisfy 10% or more and 99% or less of each opening width Wi and Wo (see FIG. 9).
- the overlapping range Lx is preferably 20% or more, 30% or more, more preferably 50% or more of the opening widths Wi and Wo, preferably 95% or less, and more preferably 90% or less.
- the cell stack 2 according to the second embodiment can achieve the same effects as those described in the first embodiment.
- the frame, the cell frame, and the cell stack according to the embodiment of the present invention can be suitably used for an RF battery.
- Redox flow battery (RF battery) 2 Cell Stack 3 Cell Frame 31 Bipolar Plate 32 Frame 32p Positive Electrolyte Channel 32n Negative Electrolyte Channel 33 Supply Manifold (Positive Supply Manifold) 34 Liquid supply manifold (Liquid supply manifold for negative electrode) 35 Drainage manifold (Drainage manifold for positive electrode) 36 Drainage manifold (drainage manifold for negative electrode) 33s Liquid supply slit (Liquid supply slit for positive electrode) 33i inlet 34s liquid supply slit (liquid supply slit for negative electrode) 34i inlet 35s drainage slit (drainage slit for positive electrode) 35o outlet part 36s drainage slit (drainage slit for negative electrode) 36o Outlet part 37 Seal member 38 Seal groove 100 cell 101 Diaphragm 102 Positive electrode cell 103 Negative electrode cell 100P Positive electrode circulation mechanism 100N Negative electrode circulation mechanism 104 Positive electrode 105 Negative electrode 106 Positive electrode electrolyte tank
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Abstract
Description
レドックスフロー電池の正極電極と負極電極との間に配置される双極板の周囲に設けられる枠体であって、
前記枠体は、
前記枠体に貫通して設けられ、前記正極電極に供給される正極電解液が流通する正極用給液マニホールド、及び、前記正極電極から排出される正極電解液が流通する正極用排液マニホールドと、
前記枠体の一面側に設けられ、前記枠体の内側に開口する入口部を有し、前記正極用給液マニホールドから前記正極電極に正極電解液を供給する正極用給液スリットと、前記枠体の内側に開口する出口部を有し、前記正極電極から前記正極用排液マニホールドに前記正極電解液を排出する正極用排液スリットと、を備える正極電解液用流路と、
前記枠体に貫通して設けられ、前記負極電極に供給される負極電解液が流通する負極用給液マニホールド、及び、前記負極電極から排出される負極電解液が流通する負極用排液マニホールドと、
前記枠体の他面側に設けられ、前記枠体の内側に開口する入口部を有し、前記負極用給液マニホールドから前記負極電極に負極電解液を供給する負極用給液スリットと、前記枠体の内側に開口する出口部を有し、前記負極電極から前記負極用排液マニホールドに前記負極電解液を排出する負極用排液スリットと、を備える負極電解液用流路と、を備え、
前記正極用給液スリットと前記負極用給液スリットとの前記入口部同士の組、及び、前記正極用排液スリットと前記負極用排液スリットとの前記出口部同士の組のうち少なくとも一組は、前記枠体の厚さ方向において互いに部分的に重なるように設けられている。
レドックスフロー電池の正極電極と負極電極との間に配置される双極板と、前記双極板の周囲に設けられる枠体とを有するセルフレームを備えるセルスタックであって、
前記枠体は、
前記枠体に貫通して設けられ、前記正極電極に供給される正極電解液が流通する正極用給液マニホールド、及び、前記正極電極から排出される正極電解液が流通する正極用排液マニホールドと、
前記枠体の一面側に設けられ、前記枠体の内側に開口する入口部を有し、前記正極用給液マニホールドから前記正極電極に正極電解液を供給する正極用給液スリットと、前記枠体の内側に開口する出口部を有し、前記正極電極から前記正極用排液マニホールドに前記正極電解液を排出する正極用排液スリットと、を備える正極電解液用流路と、
前記枠体に貫通して設けられ、前記負極電極に供給される負極電解液が流通する負極用給液マニホールド、及び、前記負極電極から排出される負極電解液が流通する負極用排液マニホールドと、
前記枠体の他面側に設けられ、前記枠体の内側に開口する入口部を有し、前記負極用給液マニホールドから前記負極電極に負極電解液を供給する負極用給液スリットと、前記枠体の内側に開口する出口部を有し、前記負極電極から前記負極用排液マニホールドに前記負極電解液を排出する負極用排液スリットと、を備える負極電解液用流路と、を備え、
前記正極用給液スリットと前記負極用給液スリットとの前記入口部同士の組、及び、前記正極用排液スリットと前記負極用排液スリットとの前記出口部同士の組は、前記枠体の厚さ方向において互いに重なり合うように設けられており、
前記セルフレームが積層され、隣接する前記セルフレームの前記枠体の一面側と他面側とが互いに対向した状態において、一方の前記枠体の一面側に設けられた前記正極用給液スリットの前記入口部及び前記正極用排液スリットの前記出口部と、他方の前記枠体の他面側に設けられた前記負極用給液スリットの前記入口部及び前記負極用排液スリットの前記出口部とが、それぞれ積層方向に互いに部分的に重なるように設けられている。
更なるレドックスフロー電池の信頼性及び性能の向上が望まれている。
本開示によれば、レドックスフロー電池の信頼性及び性能の向上を図ることができる枠体、セルフレーム、及びセルスタックを提供できる。また、本開示によれば、信頼性が高く、電池性能に優れるレドックスフロー電池を提供できる。
最初に本願発明の実施形態の内容を列記して説明する。
レドックスフロー電池の正極電極と負極電極との間に配置される双極板の周囲に設けられる枠体であって、
前記枠体は、
前記枠体に貫通して設けられ、前記正極電極に供給される正極電解液が流通する正極用給液マニホールド、及び、前記正極電極から排出される正極電解液が流通する正極用排液マニホールドと、
前記枠体の一面側に設けられ、前記枠体の内側に開口する入口部を有し、前記正極用給液マニホールドから前記正極電極に正極電解液を供給する正極用給液スリットと、前記枠体の内側に開口する出口部を有し、前記正極電極から前記正極用排液マニホールドに前記正極電解液を排出する正極用排液スリットと、を備える正極電解液用流路と、
前記枠体に貫通して設けられ、前記負極電極に供給される負極電解液が流通する負極用給液マニホールド、及び、前記負極電極から排出される負極電解液が流通する負極用排液マニホールドと、
前記枠体の他面側に設けられ、前記枠体の内側に開口する入口部を有し、前記負極用給液マニホールドから前記負極電極に負極電解液を供給する負極用給液スリットと、前記枠体の内側に開口する出口部を有し、前記負極電極から前記負極用排液マニホールドに前記負極電解液を排出する負極用排液スリットと、を備える負極電解液用流路と、を備え、
前記正極用給液スリットと前記負極用給液スリットとの前記入口部同士の組、及び、前記正極用排液スリットと前記負極用排液スリットとの前記出口部同士の組のうち少なくとも一組は、前記枠体の厚さ方向において互いに部分的に重なるように設けられている。
レドックスフロー電池の正極電極と負極電極との間に配置される双極板と、前記双極板の周囲に設けられる枠体とを有するセルフレームを備えるセルスタックであって、
前記枠体は、
前記枠体に貫通して設けられ、前記正極電極に供給される正極電解液が流通する正極用給液マニホールド、及び、前記正極電極から排出される正極電解液が流通する正極用排液マニホールドと、
前記枠体の一面側に設けられ、前記枠体の内側に開口する入口部を有し、前記正極用給液マニホールドから前記正極電極に正極電解液を供給する正極用給液スリットと、前記枠体の内側に開口する出口部を有し、前記正極電極から前記正極用排液マニホールドに前記正極電解液を排出する正極用排液スリットと、を備える正極電解液用流路と、
前記枠体に貫通して設けられ、前記負極電極に供給される負極電解液が流通する負極用給液マニホールド、及び、前記負極電極から排出される負極電解液が流通する負極用排液マニホールドと、
前記枠体の他面側に設けられ、前記枠体の内側に開口する入口部を有し、前記負極用給液マニホールドから前記負極電極に負極電解液を供給する負極用給液スリットと、前記枠体の内側に開口する出口部を有し、前記負極電極から前記負極用排液マニホールドに前記負極電解液を排出する負極用排液スリットと、を備える負極電解液用流路と、を備え、
前記正極用給液スリットと前記負極用給液スリットとの前記入口部同士の組、及び、前記正極用排液スリットと前記負極用排液スリットとの前記出口部同士の組は、前記枠体の厚さ方向において互いに重なり合うように設けられており、
前記セルフレームが積層され、隣接する前記セルフレームの前記枠体の一面側と他面側とが互いに対向した状態において、一方の前記枠体の一面側に設けられた前記正極用給液スリットの前記入口部及び前記正極用排液スリットの前記出口部と、他方の前記枠体の他面側に設けられた前記負極用給液スリットの前記入口部及び前記負極用排液スリットの前記出口部とが、それぞれ積層方向に互いに部分的に重なるように設けられている。
本願発明の実施形態に係る枠体、セルフレーム、セルスタック、及びレドックスフロー電池(RF電池)の具体例を、以下に図面を参照しつつ説明する。図中の同一符号は同一又は相当部分を示す。なお、本願発明はこれらの例示に限定されるものではなく、請求の範囲によって示され、請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。
図1、図2を参照して、実施形態に係るレドックスフロー電池(以下、RF電池)の一例を説明する。RF電池1は、正極電解液及び負極電解液に酸化還元により価数が変化する金属イオンを活物質として含有する電解液を使用し、正極電解液に含まれるイオンの酸化還元電位と、負極電解液に含まれるイオンの酸化還元電位との差を利用して充放電を行う電池である。ここでは、RF電池1の一例として、正極電解液及び負極電解液に活物質となるVイオンを含有するバナジウム電解液を使用したバナジウム系RF電池の場合を示す。図1中のセル100内の実線矢印は充電反応を、破線矢印は放電反応をそれぞれ示している。RF電池1は、例えば、負荷平準化用途、瞬低補償や非常用電源などの用途、大量導入が進められている太陽光発電や風力発電などの自然エネルギーの出力平滑化用途などに利用される。
セル100は通常、図2、図3に示すような、セルスタック2と呼ばれる構造体の内部に形成される。セルスタック2は、サブスタック200(図3参照)と呼ばれる積層体をその両側から2枚のエンドプレート220で挟み込み、両側のエンドプレート220を締付機構230で締め付けることで構成されている(図3に例示する構成では、複数のサブスタック200を備える)。サブスタック200は、セルフレーム3、正極電極104、隔膜101、及び負極電極105を複数積層してなり、その積層体の両端に給排板210(図3の下図参照、図2では省略)が配置された構成である。
セルフレーム3は、図2、図3に示すように、正極電極104と負極電極105との間に配置される双極板31と、双極板31の周囲に設けられる枠体32とを有する。双極板31の一面側には、正極電極104が接触するように配置され、双極板31の他面側には、負極電極105が接触するように配置される。枠体32の内側には、双極板31が設けられ、正極電極104及び負極電極105が双極板31を挟んで収納される。サブスタック200(セルスタック2)では、隣接する各セルフレーム3の双極板31の間にそれぞれ1つのセル100が形成されることになり、隣接する各セルフレーム3の枠体32の一面側と他面側とが互いに対向して突き合わされた状態となる。
枠体32は、正極電極104及び負極電極105の各電極に供給される正極電解液及び負極電解液の各電解液が流通する給液マニホールド33、34、及び、各電極から排出される各電解液が流通する排液マニホールド35、36を備える。また、枠体32には、各給液マニホールド33、34から各電極に各電解液を供給する給液スリット33s、34sと、各電極から各排液マニホールド35、36に各電解液を排出する排液スリット35s、36sとを備える。正極電極104及び負極電極105への正負の各電解液の流通は、給排板210(図3の下図参照)を介して、図3に示す枠体32に貫通して設けられた給液マニホールド33、34及び排液マニホールド35、36と、枠体32の一面側と他面側にそれぞれ設けられた給液スリット33s、34s及び排液スリット35s、36sにより行われる(図4、図5も合わせて参照)。
実施形態に係る枠体32の特徴の一つは、正極用給液スリット33sと負極用給液スリット34sとの入口部33i、34i同士の組、及び、正極用排液スリット35sと負極用排液スリット36sとの出口部35o、36o同士の組のうち少なくとも一組が、枠体32の厚さ方向において互いに部分的に重なるように設けられている点にある。以下、図4~図8を参照して、実施形態1に係る枠体32(セルフレーム3)、及びこのセルフレーム3を備えるセルスタック2について、詳しく説明する
実施形態1に係る枠体32は、次の作用効果を奏する。
以下、図8~図10を参照して、別の実施形態に係るセルスタック2について、説明する。以下では、実施形態1との相違点を中心に説明し、実施形態1で説明した内容と同じ内容についてはその説明を省略する。実施形態2に係るセルスタック2の特徴の一つは、図8、図9に示すように、セルスタック2を構成する個々のセルフレーム3の枠体32において、正極用給液スリット33sと負極用給液スリット34sとの入口部33i、34i同士の組、及び、正極用排液スリット35sと負極用排液スリット36sとの出口部35o、36o同士の組が、枠体32の厚さ方向において互いに重なり合うように設けられている点にある。また、セルスタック2の別の特徴の1つは、図10に示すように、隣接するセルフレーム3同士において、一方の枠体32の一面側に設けられた正極用給液スリット33sの入口部33i及び正極用排液スリット35sの出口部35oと、他方の枠体32の他面側に設けられた負極用給液スリット34sの入口部34i及び負極用排液スリット36sの出口部36oとが、それぞれ積層方向に互いに部分的に重なるように設けられている点にある。
本願発明の実施形態に係る枠体、セルフレーム、及びセルスタックは、RF電池に好適に利用可能である。
2 セルスタック
3 セルフレーム
31 双極板
32 枠体
32p 正極電解液用流路
32n 負極電解液用流路
33 給液マニホールド(正極用給液マニホールド)
34 給液マニホールド(負極用給液マニホールド)
35 排液マニホールド(正極用排液マニホールド)
36 排液マニホールド(負極用排液マニホールド)
33s 給液スリット(正極用給液スリット)
33i 入口部
34s 給液スリット(負極用給液スリット)
34i 入口部
35s 排液スリット(正極用排液スリット)
35o 出口部
36s 排液スリット(負極用排液スリット)
36o 出口部
37 シール部材
38 シール溝
100 セル
101 隔膜
102 正極セル
103 負極セル
100P 正極用循環機構
100N 負極用循環機構
104 正極電極
105 負極電極
106 正極電解液用タンク
107 負極電解液用タンク
108、109、110、111 導管
112、113 ポンプ
200 サブスタック
210 給排板
220 エンドプレート
230 締付機構
Claims (6)
- レドックスフロー電池の正極電極と負極電極との間に配置される双極板の周囲に設けられる枠体であって、
前記枠体は、
前記枠体に貫通して設けられ、前記正極電極に供給される正極電解液が流通する正極用給液マニホールド、及び、前記正極電極から排出される正極電解液が流通する正極用排液マニホールドと、
前記枠体の一面側に設けられ、前記枠体の内側に開口する入口部を有し、前記正極用給液マニホールドから前記正極電極に正極電解液を供給する正極用給液スリットと、前記枠体の内側に開口する出口部を有し、前記正極電極から前記正極用排液マニホールドに前記正極電解液を排出する正極用排液スリットと、を備える正極電解液用流路と、
前記枠体に貫通して設けられ、前記負極電極に供給される負極電解液が流通する負極用給液マニホールド、及び、前記負極電極から排出される負極電解液が流通する負極用排液マニホールドと、
前記枠体の他面側に設けられ、前記枠体の内側に開口する入口部を有し、前記負極用給液マニホールドから前記負極電極に負極電解液を供給する負極用給液スリットと、前記枠体の内側に開口する出口部を有し、前記負極電極から前記負極用排液マニホールドに前記負極電解液を排出する負極用排液スリットと、を備える負極電解液用流路と、を備え、
前記正極用給液スリットと前記負極用給液スリットとの前記入口部同士の組、及び、前記正極用排液スリットと前記負極用排液スリットとの前記出口部同士の組のうち少なくとも一組は、前記枠体の厚さ方向において互いに部分的に重なるように設けられている枠体。 - 前記正極用給液スリットと前記負極用給液スリットとの前記入口部同士の組、及び、前記正極用排液スリットと前記負極用排液スリットとの前記出口部同士の組のうち少なくとも一組は、前記枠体の厚さ方向における互いに重なる範囲がそれぞれの開口幅の10%以上99%以下である請求項1に記載の枠体。
- 請求項1又は請求項2に記載の枠体と、前記枠体の内側に設けられる前記双極板とを有するセルフレーム。
- 請求項3に記載のセルフレームを備えるセルスタック。
- レドックスフロー電池の正極電極と負極電極との間に配置される双極板と、前記双極板の周囲に設けられる枠体とを有するセルフレームを備えるセルスタックであって、
前記枠体は、
前記枠体に貫通して設けられ、前記正極電極に供給される正極電解液が流通する正極用給液マニホールド、及び、前記正極電極から排出される正極電解液が流通する正極用排液マニホールドと、
前記枠体の一面側に設けられ、前記枠体の内側に開口する入口部を有し、前記正極用給液マニホールドから前記正極電極に正極電解液を供給する正極用給液スリットと、前記枠体の内側に開口する出口部を有し、前記正極電極から前記正極用排液マニホールドに前記正極電解液を排出する正極用排液スリットと、を備える正極電解液用流路と、
前記枠体に貫通して設けられ、前記負極電極に供給される負極電解液が流通する負極用給液マニホールド、及び、前記負極電極から排出される負極電解液が流通する負極用排液マニホールドと、
前記枠体の他面側に設けられ、前記枠体の内側に開口する入口部を有し、前記負極用給液マニホールドから前記負極電極に負極電解液を供給する負極用給液スリットと、前記枠体の内側に開口する出口部を有し、前記負極電極から前記負極用排液マニホールドに前記負極電解液を排出する負極用排液スリットと、を備える負極電解液用流路と、を備え、
前記正極用給液スリットと前記負極用給液スリットとの前記入口部同士の組、及び、前記正極用排液スリットと前記負極用排液スリットとの前記出口部同士の組は、前記枠体の厚さ方向において互いに重なり合うように設けられており、
前記セルフレームが積層され、隣接する前記セルフレームの前記枠体の一面側と他面側とが互いに対向した状態において、一方の前記枠体の一面側に設けられた前記正極用給液スリットの前記入口部及び前記正極用排液スリットの前記出口部と、他方の前記枠体の他面側に設けられた前記負極用給液スリットの前記入口部及び前記負極用排液スリットの前記出口部とが、それぞれ積層方向に互いに部分的に重なるように設けられているセルスタック。 - 請求項4又は請求項5に記載のセルスタックを備えるレドックスフロー電池。
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PCT/JP2016/086644 WO2018105092A1 (ja) | 2016-12-08 | 2016-12-08 | 枠体、セルフレーム、セルスタック、及びレドックスフロー電池 |
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