WO2023181796A1 - 双極型蓄電池 - Google Patents
双極型蓄電池 Download PDFInfo
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- WO2023181796A1 WO2023181796A1 PCT/JP2023/007097 JP2023007097W WO2023181796A1 WO 2023181796 A1 WO2023181796 A1 WO 2023181796A1 JP 2023007097 W JP2023007097 W JP 2023007097W WO 2023181796 A1 WO2023181796 A1 WO 2023181796A1
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- positive electrode
- negative electrode
- bipolar
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- space
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/06—Lead-acid accumulators
- H01M10/12—Construction or manufacture
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/06—Lead-acid accumulators
- H01M10/18—Lead-acid accumulators with bipolar electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/70—Carriers or collectors characterised by shape or form
- H01M4/72—Grids
- H01M4/73—Grids for lead-acid accumulators, e.g. frame plates
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
- H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
- H01M50/627—Filling ports
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- Embodiments of the present invention relate to bipolar storage batteries.
- the lead-acid battery described in Patent Document 1 includes a bipolar plate in which a positive electrode active material layer and a negative electrode active material layer are provided on one side and the other side of a conductive metal base material.
- the bipolar plate is sandwiched between a pair of end plates, and a separator is provided between each pair of adjacent bipolar plates.
- the lead-acid battery used in the above-described power storage system needs to have a long life performance that can withstand long-term operation.
- the separator sandwiched between the opposing positive electrode active material layer and the negative electrode active material layer is brought into contact with the positive electrode active material layer and the negative electrode active material layer, so that the separator is exposed to the electrolyte impregnated in the separator. It has the role of bringing the liquid into contact with the positive electrode active material layer and the negative electrode active material layer. It also has the role of holding down the positive electrode active material layer and the negative electrode active material layer.
- the separator must be in uniform contact with the positive electrode active material layer and the negative electrode active material layer.
- the pressure during injection of electrolyte may cause deformation of the separator, making it difficult to maintain uniformity. Contact may be inhibited. If the separator is deformed in this way, not only will it not come into uniform contact with the positive electrode active material layer and the negative electrode active material layer, but it is also conceivable that a short circuit will occur between the positive electrode side and the negative electrode side.
- the electrolyte does not enter the space in which the cell members are accommodated. do not have.
- the present invention prevents components in the space from being affected by the pressure of the injected electrolyte, such as deformation of the separator, when the electrolyte is injected into the space in which the cell member is housed.
- this bipolar type prevents short circuits between the positive and negative electrode sides inside the cell member and shortens takt time.
- the purpose is to provide type storage batteries.
- a bipolar storage battery includes a positive electrode having a positive electrode current collector and a positive electrode active material layer, a negative electrode having a negative electrode current collector and a negative electrode active material layer, and a negative electrode between the positive electrode and the negative electrode. Covers at least one of the positive electrode side and the negative electrode side of the cell member, including an intervening separator and forming a plurality of spaces for individually accommodating the cell member and the plurality of cell members stacked at intervals.
- a space forming member including a substrate, a frame body surrounding a side surface of the cell member, a plurality of through holes opening into a space in which the cell member is accommodated, and a portion of the frame body surrounding one side surface of the cell member. It has a covering lid, and the lid is characterized in that it has one communication port that communicates with the plurality of through holes.
- a positive electrode having a positive electrode current collector and a positive electrode active material layer, a negative electrode having a negative electrode current collector and a negative electrode active material layer, and a positive electrode and a negative electrode having a positive electrode current collector and a negative electrode active material layer.
- At least one of the positive electrode side and the negative electrode side of the cell member which includes a separator interposed between the cell members and is stacked at intervals, and forms a plurality of spaces that individually accommodate the plurality of cell members.
- a space forming member including a substrate covering the cell member, a frame body surrounding the side surface of the cell member, a plurality of through holes opening into the space in which the cell member is accommodated, and a frame body surrounding one side surface of the cell member. and a lid that covers the portion, and the lid has one communication port that communicates with the plurality of through holes.
- FIG. 1 is a cross-sectional view showing the structure of a bipolar lead-acid battery according to an embodiment of the present invention.
- FIG. 2 is an explanatory diagram showing the positional relationship between a bipolar lead-acid battery and a lid according to an embodiment of the present invention.
- FIG. 2 is an explanatory diagram showing the positional relationship between a bipolar lead-acid battery and a lid according to an embodiment of the present invention. It is an explanatory view showing a state where a lid is attached to a bipolar lead-acid battery according to an embodiment of the present invention.
- 5 is a cross-sectional view showing a bipolar lead-acid battery according to an embodiment of the present invention taken along line AA shown in FIG. 4.
- FIG. 4 is a cross-sectional view showing a bipolar lead-acid battery according to an embodiment of the present invention taken along line AA shown in FIG. 4.
- FIG. 1 is a cross-sectional view showing the structure of a bipolar lead-acid battery 100 according to an embodiment of the present invention.
- drawing of a lid 190 which will be described later, is omitted.
- a bipolar lead-acid battery 100 includes a plurality of cell members 110, a plurality of bipolar plates (space forming members) 120, and a first end plate ( It has a space forming member) 130 and a second end plate (space forming member) 140.
- FIG. 1 shows a bipolar lead-acid battery 100 in which three cell members 110 are stacked
- the number of cell members 110 is determined by the battery design. Further, the number of bipolar plates 120 is determined according to the number of cell members 110.
- the stacking direction of the cell members 110 is referred to as the Z direction (vertical direction in FIG. 1), and directions perpendicular to the Z direction and mutually perpendicular are referred to as directions.
- the cell member 110 includes a positive electrode 111, a negative electrode 112, and an electrolyte layer (separator) 113.
- the positive electrode 111 includes a positive electrode lead foil 111a, which is a positive electrode current collector made of lead or a lead alloy, and a positive electrode active material layer 111b.
- the negative electrode 112 includes a negative electrode lead foil 112a, which is a negative electrode current collector made of lead or a lead alloy, and a negative electrode active material layer 112b.
- This positive electrode lead foil 111a is bipolarized by an adhesive 150, which will be described later, provided between one surface of the bipolar plate 120 (in the drawing of FIG. 1, the surface facing upward in the paper) and the positive electrode lead foil 111a. It is provided on one side of the plate 120. Therefore, on one surface of the bipolar plate 120, an adhesive layer (adhesive 150), a positive electrode lead foil 111a, and a positive electrode active material layer 111b are laminated in this order.
- the negative electrode lead foil 112a is attached to the bipolar plate by an adhesive 150, which will be described later, provided between the other surface of the bipolar plate 120 (in the drawing of FIG. 1, the surface facing downward in the paper) and the negative electrode lead foil 112a. 120 is provided on the other surface. Therefore, on the other surface of the bipolar plate 120, an adhesive layer (adhesive 150), a negative electrode lead foil 112a, and a negative electrode active material layer 112b are laminated in this order.
- the positive electrode 111 and the negative electrode 112 are electrically connected via a conductor 160, which will be described later.
- the separator 113 is made of, for example, a glass fiber mat impregnated with an electrolytic solution containing sulfuric acid.
- the separator 113 is provided so as to be sandwiched between a positive electrode active material layer 111b provided on one bipolar plate 120 facing each other and a negative electrode active material layer 112b provided on the other bipolar plate 120.
- a positive electrode lead foil 111a, a positive electrode active material layer 111b, a separator 113, a negative electrode active material layer 112b, and a negative electrode lead foil 112a are laminated in this order.
- the bipolar plate 120, the positive electrode lead foil 111a, the positive electrode active material layer 111b, the negative electrode lead foil 112a, and the negative electrode A bipolar electrode is configured by the active material layer 112b.
- a bipolar electrode is an electrode that has the functions of both a positive electrode and a negative electrode.
- the bipolar lead-acid battery 100 is provided in a pair with a cell member 110 having a separator 113 interposed between a positive electrode 111 and a negative electrode 112, with the cell member 110 sandwiched therebetween.
- a plurality of bipolar plates 120 are stacked.
- the dimensions of the positive electrode lead foil 111a in the X and Y directions are larger than the dimensions of the positive electrode active material layer 111b in the X and Y directions.
- the dimensions of the negative electrode lead foil 112a in the X and Y directions are larger than the dimensions of the negative electrode active material layer 112b in the X and Y directions.
- the dimension (thickness) in the Z direction is that the positive electrode lead foil 111a is larger (thicker) than the negative electrode lead foil 112a, and the positive electrode active material layer 111b is larger (thicker) than the negative electrode active material layer 112b. ).
- the plurality of cell members 110 are stacked at intervals in the Z direction, and the substrate 121 of the bipolar plate 120 is disposed at this interval. That is, the plurality of cell members 110 are stacked with the substrate 121 of the bipolar plate 120 sandwiched therebetween.
- the plurality of bipolar plates 120, the first end plate 130, and the second end plate 140 form spaces for forming a plurality of spaces (cells) C that individually accommodate the plurality of cell members 110. It is a member.
- the bipolar plate 120 covers both the positive electrode 111 side and the negative electrode 112 side of the cell member 110 and has a frame that surrounds the substrate 121 having a rectangular planar shape and the side surfaces of the cell member 110 and covers the four end faces of the substrate 121.
- the bipolar plate 120 further includes column parts 123 that protrude perpendicularly from both sides of the substrate 121.
- the number of pillar portions 123 protruding from each surface of the substrate 121 may be one or more.
- the substrate 121, frame body 122, and pillar portion 123 that constitute the bipolar plate 120 are integrally formed of, for example, thermoplastic resin.
- thermoplastic resin forming the bipolar plate 120 include acrylonitrile-butadiene-styrene copolymer (ABS resin) and polypropylene. These thermoplastic resins have excellent moldability and sulfuric acid resistance. Therefore, even if the electrolytic solution comes into contact with the bipolar plate 120, the bipolar plate 120 is unlikely to be decomposed, deteriorated, corroded, or the like.
- the dimensions of the frame 122 are larger than the dimensions (thickness) of the substrate 121, and the dimensions between the protruding end surfaces of the pillars 123 are the same as the dimensions of the frame 122.
- a space C is formed between the substrates 121 by stacking the plurality of bipolar plates 120 with their frame bodies 122 and columnar portions 123 in contact with each other. The dimension of the space C in the Z direction is maintained by the pillar portions 123 that are in contact with each other.
- the positive electrode lead foil 111a, the positive electrode active material layer 111b, the negative electrode lead foil 112a, the negative electrode active material layer 112b, and the separator 113 have through holes 111c, 111d, 112c, 112d, and 113a through which the column parts 123 penetrate. each formed.
- the substrate 121 of the bipolar plate 120 has a plurality of through holes 121a passing through the plate surface.
- a first recess 121b is formed on one surface of the substrate 121, and a second recess 121c is formed on the other surface.
- the depth of the first recess 121b is deeper than the depth of the second recess 121c.
- the dimensions of the first recess 121b and the second recess 121c in the X and Y directions correspond to the dimensions of the positive electrode lead foil 111a and the negative electrode lead foil 112a in the X and Y directions.
- the substrate 121 of the bipolar plate 120 is arranged between adjacent cell members 110 in the Z direction. Then, the positive electrode lead foil 111a of the cell member 110 is placed in the first recess 121b of the substrate 121 of the bipolar plate 120 via an adhesive 150. Further, the negative electrode lead foil 112a of the cell member 110 is placed in the second recess 121c of the substrate 121 of the bipolar plate 120 via an adhesive 150.
- a conductor 160 is arranged in the through hole 121a of the substrate 121 of the bipolar plate 120. Both end surfaces of the conductor 160 are in contact with and bonded to the positive electrode lead foil 111a and the negative electrode lead foil 112a. That is, the conductor 160 electrically connects the positive electrode lead foil 111a and the negative electrode lead foil 112a. As a result, all of the plurality of cell members 110 are electrically connected in series.
- a cover plate 170 is provided at the outer edge of the positive electrode lead foil 111a to cover the outer edge.
- This cover plate 170 is a thin plate-like frame and has rectangular inner and outer lines. The inner edge of the cover plate 170 overlaps with the outer edge of the positive electrode lead foil 111a, and the outer edge of the cover plate 170 overlaps with the peripheral edge of the first recess 121b on one surface of the substrate 121.
- the rectangle that forms the inner line of the cover plate 170 is smaller than the rectangle that forms the outer line of the positive electrode lead foil 111a, and the rectangle that forms the outer line of the cover plate 170 is the rectangle that forms the opening surface of the first recess 121b. bigger.
- the adhesive 150 extends from the end surface of the positive electrode lead foil 111a to the outer edge of the opening side of the first recess 121b, and is disposed between the inner edge of the cover plate 170 and the outer edge of the positive electrode lead foil 111a. Ru. The adhesive 150 is also placed between the outer edge of the cover plate 170 and one surface of the substrate 121.
- the cover plate 170 is fixed by the adhesive 150 across the peripheral edge of the first recess 121b on one surface of the substrate 121 and the outer edge of the positive electrode lead foil 111a. Thereby, the outer edge of the positive electrode lead foil 111a is covered with the cover plate 170 even at the boundary with the peripheral edge of the first recess 121b.
- the outer edge of the negative lead foil 112a may also be covered with a cover plate similar to the cover plate 170 covering the outer edge of the positive lead foil 111a.
- the cover plate has been explained using a thin plate-like frame as an example, it may also be a tape-like material, for example, as long as it is resistant to electrolytes (sulfuric acid). .
- the first end plate 130 is a space forming member that includes a substrate 131 that covers the positive electrode side of the cell member 110 and a frame 132 that surrounds the side surface of the cell member 110. Further, a column portion 133 is provided that projects perpendicularly from one surface of the substrate 131 (the surface of the bipolar plate 120 disposed closest to the positive electrode that faces the substrate 121).
- the planar shape of the substrate 131 is a rectangle, four end faces of the substrate 131 are covered with a frame 132, and the substrate 131, the frame 132, and the pillar portion 133 are integrally formed of, for example, the above-mentioned thermoplastic resin. .
- the number of pillar portions 133 protruding from one surface of the substrate 131 may be one or more. However, the number corresponds to the number of pillars 123 of the bipolar plate 120 that are brought into contact with the pillars 133.
- the dimensions of the frame 132 are larger than the dimensions (thickness) of the substrate 131, and the dimensions between the protruding end surfaces of the pillars 133 are the same as the dimensions of the frame 132.
- the first end plate 130 is stacked with the frame 132 and column 133 in contact with the frame 122 and column 123 of the bipolar plate 120 disposed at the outermost side (on the positive electrode side).
- a space C is formed between the substrate 121 of the bipolar plate 120 and the substrate 131 of the first end plate 130. Furthermore, the dimension of the space C in the Z direction is maintained by the pillar portions 123 of the bipolar plate 120 and the pillar portions 133 of the first end plate 130 that are in contact with each other.
- Through holes 111c, 111d, and 113a are formed in the positive electrode lead foil 111a, the positive electrode active material layer 111b, and the separator 113 of the cell member 110 disposed on the outermost side (positive electrode side), respectively. ing.
- a recess 131b is formed on one surface of the substrate 131 of the first end plate 130.
- the dimensions of the recess 131b in the X and Y directions correspond to the dimensions of the positive electrode lead foil 111a in the X and Y directions.
- the positive electrode lead foil 111a of the cell member 110 is placed in the recess 131b of the substrate 131 of the first end plate 130 with an adhesive 150 interposed therebetween. Further, like the substrate 121 of the bipolar plate 120, a cover plate 170 is fixed to one side of the substrate 131 with an adhesive 150. As a result, the outer edge of the positive electrode lead foil 111a is covered with the cover plate 170 even at the boundary with the peripheral edge of the recess 131b.
- the first end plate 130 includes a positive electrode terminal (not shown in FIG. 1) that is electrically connected to the positive electrode lead foil 111a in the recess 131b.
- the second end plate 140 is a space forming member that includes a substrate 141 that covers the negative electrode side of the cell member 110 and a frame 142 that surrounds the side surface of the cell member 110. Furthermore, a column portion 143 is provided that projects perpendicularly from one surface of the substrate 141 (the surface of the bipolar plate 120 disposed closest to the negative electrode side that faces the substrate 121).
- the planar shape of the substrate 141 is a rectangle, four end faces of the substrate 141 are covered with a frame 142, and the substrate 141, the frame 142, and the pillar portion 143 are integrally formed of, for example, the above-mentioned thermoplastic resin. .
- the number of pillar portions 143 protruding from one surface of the substrate 141 may be one or more. However, the number corresponds to the number of pillars 123 of the bipolar plate 120 that are brought into contact with the pillars 143.
- the dimensions of the frame 142 are larger than the dimensions (thickness) of the substrate 131, and the dimensions between the protruding end surfaces of the two pillars 143 are the same as the dimensions of the frame 142.
- the second end plate 140 is stacked with the frame 142 and column 143 in contact with the frame 122 and column 123 of the bipolar plate 120 disposed at the outermost side (on the negative electrode side).
- a space C is formed between the substrate 121 of the bipolar plate 120 and the substrate 141 of the second end plate 140. Further, the dimension of the space C in the Z direction is maintained by the pillar portions 123 of the bipolar plate 120 and the pillar portions 143 of the second end plate 140 that are in contact with each other.
- Through holes 112c, 112d, and 113a are formed in the negative electrode lead foil 112a, the negative electrode active material layer 112b, and the separator 113 of the cell member 110 disposed on the outermost side (negative electrode side), respectively, through which the pillar portions 143 penetrate. ing.
- a recess 141b is formed on one surface of the substrate 141 of the second end plate 140.
- the dimensions of the recess 141b in the X and Y directions correspond to the dimensions of the negative electrode lead foil 112a in the X and Y directions.
- the negative electrode lead foil 112a of the cell member 110 is placed in the recess 141b of the substrate 141 of the second end plate 140 via an adhesive 150. Further, the second end plate 140 includes a negative electrode terminal (not shown in FIG. 1) that is electrically connected to the negative electrode lead foil 112a in the recess 141b.
- vibration welding when joining the opposing bipolar plates 120, the first end plate 130 and the opposing bipolar plate 120, or the second end plate 140 and the opposing bipolar plate 120, for example, vibration welding ( Various welding methods can be employed, such as vibration welding), ultrasonic welding, and hot plate welding. Among these, vibration welding is a method of welding by vibrating the surfaces to be joined while pressurizing them, and the welding cycle is quick and the reproducibility is good. Therefore, vibration welding is more preferably used.
- the objects to be welded include not only the frames disposed at opposing positions in the mutually opposing bipolar plates 120, first end plate 130, and second end plate 140, but also each column.
- the bipolar lead-acid battery 100 includes a plurality of through holes 180 that open into the space C in which the cell members 110 are accommodated.
- the through hole 180 is formed in one of the four end surfaces of the bipolar plate 120, the first end plate 130, and the second end plate 140.
- the through hole 180 is formed on the right side in FIGS. and a through path 183 that connects the outer opening 181 and the inner opening 182.
- the first end plate 130 includes an outer opening 181 that opens toward the outside, and an inner opening 182 that penetrates into the space C.
- a through path 183 is formed so as to connect them.
- the second end plate 140 also includes an outer opening 181 that opens toward the outside, and an inner opening 182 that penetrates into the space C, and connects the outer opening 181 and the inner opening 182.
- a through path 183 is formed in the.
- FIGS. 2 and 3 are explanatory diagrams showing the positional relationship between the bipolar lead-acid battery 100 and the lid 190 according to the embodiment of the present invention.
- FIG. 4 is an explanatory diagram showing a state in which a lid 190 is attached to the bipolar lead-acid battery 100 according to the embodiment of the present invention.
- the bipolar lead-acid battery 100 is rotated 90 degrees from the orientation shown in FIG. 1 so that the YZ plane is oriented vertically in the drawings.
- the YZ plane is the ground plane
- the X direction is parallel to the vertical direction.
- the bipolar lead-acid battery 100 depicted in these figures has two bipolar plates 120 sandwiched between a first end plate 130 and a second end plate 140, as shown in FIG. There is.
- a through hole 180 is formed at a position where each plate contacts.
- the through hole 180 is formed, for example, on the right side in FIG. 1 in the space forming members such as the bipolar plate 120, the first end plate 130, and the second end plate 140. Therefore, as shown in FIGS. 2 to 4, the through hole 180 appears at a position facing the lid 190, and the outer opening 181 is visible.
- a lid 190 is drawn on the upper part of the bipolar lead-acid battery 100 in the X direction, and as can be seen from FIGS. , 132, 142 are arranged so as to cover the portion surrounding one side of the cell member 110.
- the lid 190 is provided with one communication port 191 that communicates with the plurality of through holes 180.
- This communication port 191 plays the role of a through port used to inject electrolyte into the space C during manufacturing. That is, after the lid 190 is attached to the bipolar lead-acid battery 100 (see FIG. 4), the electrolytic solution is injected into the space C from the communication port 191 through each of the through holes 180.
- the communication port 191 After the necessary amount is injected, the communication port 191 is sealed. Therefore, after manufacturing, the communication port 191 serves as an exhaust port for exhausting gas generated in the space C in which the cell member 110 is accommodated.
- the injected electrolyte is dispersed and injected into the space C from the plurality of through holes 180. Therefore, the force with which the electrolyte is injected can be weakened.
- the electrolytic solution can be injected into the space C from any one of the plurality of through-holes 180. Therefore, it is possible to shorten the takt time.
- the generated gas can be transferred to the outside of the bipolar lead-acid battery 100 through the through holes 180 and the communication hole 191. It's easy to get away with it.
- the opening area per one through-hole 180 is smaller when multiple through-holes 180 are provided than when there is one through-hole 180. , it is easy to ensure the strength of the frames 122, 132, 142 that constitute the space forming member.
- the plurality of through holes 180 may be arranged so as to be grouped together in the center in the Y direction, or they may be placed near either end of the frame 122 etc. in the Y direction.
- the arrangement position can also be arbitrarily set, such as arranging it as follows.
- the three through holes 180 are provided at equal intervals, but these intervals do not have to be equal. Furthermore, the sizes of the through holes 180 provided do not need to be equal.
- the through hole 180 has a long hole shape as shown in FIGS. 2 to 4.
- the thickness (length) of each plate in the stacking direction (Z direction) can be made thinner (shorter). This is because it can contribute to making the entire device more compact.
- the shape of the through hole 180 is not limited to such a long hole shape, and can be freely set to any shape, such as a perfect circle or a square, for example.
- the through hole 180 is formed at the boundary between adjacent plates.
- the position where the through hole 180 is formed is not limited to such a position.
- the through-hole 180 when the through-hole 180 is provided at the boundary between adjacent plates, the through-hole 180 is formed at a position that becomes a laminated surface when the adjacent plates are laminated. Therefore, instead of this position, for example, the space forming member may be formed at a position that is not the laminated surface described above.
- the through hole 180 is provided at a position shifted upward or downward in the Z direction from the position of the through hole 180 shown in the cross-sectional view of the bipolar lead-acid battery 100 shown in FIG. You can leave it there. In this case, the inner opening 182 naturally penetrates into the space C.
- the shapes of the outer opening 181 and the inner opening 182 may be, for example, circular or oval. It can be a shape. Further, the diameter of these openings can be, for example, 1 mm to 5 mm.
- the shape of the opening of the communication port 191 can be, for example, circular or oval. Further, the diameter of the opening can be, for example, 4 mm to 10 mm.
- the relationship between the through hole 180 and the communication port 191 of the lid 190 is set as follows. That is, the cross-sectional area of the through-hole 180 in a cross section perpendicular to the injection direction of the electrolytic solution is defined as the first opening area a1.
- the cross-sectional area of one communication port 191 provided in the lid 190 in a cross section perpendicular to the injection direction of the electrolytic solution is defined as a second opening area a2.
- the value understood as the "cross-sectional area" for both the first opening area a1 and the second opening area a2 is the value at which the cross-sectional area is the smallest at each part of the through-hole 180.
- the relationship between the first opening area a1 and the second opening area a2 is "3 ⁇ a1 ⁇ a2". That is, the total opening area of the first opening area a1 of each of the through holes 180 provided at the boundary between adjacent plates is greater than or equal to the second opening area a2 of the communication port 191.
- the total opening area of the first opening area a1 is 1.5 times or more and 4 times or less of the second opening area a2.
- the first opening area a1 which is the cross-sectional area of each through-hole 180, is 0.5 times or more and less than 4 times the second opening area a2.
- a plurality of through holes 180 are provided in this way, and the relationship between the through holes 180 formed at the boundaries of adjacent plates and the communication holes 191 of the lid 190 is determined such that the total opening area of the openings is the area of the openings of the communication holes 191 ( By making the size larger than the second opening area), the opening communicating with the space C can be made large.
- the electrolyte when the electrolyte is injected into the space C of the bipolar lead-acid battery 100 from the communication port 191, the electrolyte is dispersed into each through-hole 180, so that the force of the electrolyte can be weakened. Therefore, the influence on the cell member 110 due to the pressure of the electrolytic solution during injection can be minimized. Further, since the electrolytic solution is injected into the space C through one of the through holes 180, it is possible to avoid prolonging the time required for injection.
- FIG. 5 is a cross-sectional view of the bipolar lead-acid battery 100 according to the embodiment of the present invention, taken along line AA shown in FIG. 4. In addition, in FIG. 5, drawing of each structure of the cell member 110 arranged in the space C is omitted.
- the electrolytic solution injected from the communication port 191 of the lid 190 is injected into the space C through a plurality of (here, three) through holes 180.
- the outer opening 181 is formed in a tapered shape in a region continuing from the outer opening 181 to the through path 183.
- the electrolyte injected from the communication port 191 can more easily enter the through hole 180, contributing to smooth injection of the electrolyte into the space C.
- the bipolar lead-acid battery 100 of this embodiment can be manufactured, for example, by a method including the steps described below.
- the substrate 121 of the bipolar plate 120 is placed on a workbench with the first recess 121b side facing upward. Then, adhesive 150 is applied to the first recess 121b, and the positive electrode lead foil 111a is placed in the first recess 121b. At that time, the pillar portion 123 of the bipolar plate 120 is passed through the through hole 111c of the positive electrode lead foil 111a. This adhesive 150 is cured, and a positive electrode lead foil 111a is attached to one surface of the substrate 121.
- the adhesive 150 is applied to the outer edge of the positive electrode lead foil 111a and the upper surface of the substrate 121 which becomes the edge of the first recess 121b, and the cover plate 170 is placed thereon, and the adhesive 150 is cured. Thereby, the cover plate 170 is fixed over the outer edge of the positive electrode lead foil 111a and over the portion of the substrate 121 (the periphery of the first recess 121b) that continues to the outside thereof.
- bipolar plate 120 with lead foil for positive and negative electrodes is obtained.
- a necessary number of bipolar plates 120 with lead foil for positive and negative electrodes are prepared.
- adhesive 150 is applied on the outer edge of the positive electrode lead foil 111a and on the upper surface of the substrate 131 that will become the edge of the recess 131b.
- a cover plate 170 is placed on top of this adhesive 150, and the adhesive 150 is cured. Thereby, the cover plate 170 is fixed over the outer edge of the positive electrode lead foil 111a and over the portion of the substrate 131 that continues outside of the outer edge. Thereby, an end plate with lead foil for the positive electrode is obtained.
- the first end plate 130 to which the positive electrode lead foil 111a and the cover plate 170 are fixed is placed on a workbench with the positive electrode lead foil 111a facing upward.
- the positive electrode active material layer 111b is placed in the cover plate 170 and placed on the positive electrode lead foil 111a.
- the column portion 133 of the first end plate 130 is passed through the through hole 111d of the positive electrode active material layer 111b.
- the separator 113 and the negative electrode active material layer 112b are placed on the positive electrode active material layer 111b.
- the bipolar plate 120 with lead foil for positive and negative electrodes is placed on the first end plate 130 in this state with the lead foil 112a side for negative electrode facing downward.
- the pillars 123 of the bipolar plate 120 are passed through the through holes 113a of the separator 113 and the through holes 112d of the negative electrode active material layer 112b, and placed on the pillars 133 of the first end plate 130.
- the frame 122 of the bipolar plate 120 is placed on the frame 132 of the first end plate 130.
- the first end plate 130 is fixed and vibration welding is performed while the bipolar plate 120 is vibrated in the diagonal direction of the substrate 121.
- the frame 122 of the bipolar plate 120 is joined onto the frame 132 of the first end plate 130.
- the column portion 123 of the bipolar plate 120 is joined onto the column portion 133 of the first end plate 130 .
- the bipolar plate 120 is joined onto the first end plate 130.
- the cell member 110 is placed in the space C formed by the first end plate 130 and the bipolar plate 120, and the positive electrode lead foil 111a is exposed on the upper surface of the bipolar plate 120.
- the positive electrode active material layer 111b, the separator 113, and the negative electrode active material layer are placed on the thus obtained composite body in which the bipolar plate 120 is joined onto the first end plate 130. 112b are placed in this order. Thereafter, another bipolar plate 120 with lead foil for positive and negative electrodes is placed with the lead foil 112a side for negative electrodes facing downward.
- this combined body is fixed, and vibration welding is performed while vibrating another bipolar plate 120 with lead foil for positive and negative electrodes in the diagonal direction of the substrate 121. This vibration welding process is continued until the required number of bipolar plates 120 are joined onto the first end plate 130.
- the positive electrode active material layer 111b, the separator 113, and the negative electrode active material layer 112b are placed in this order on the uppermost bipolar plate 120 of the combined body in which all the bipolar plates 120 are joined. Thereafter, the second end plate 140 is further placed with the negative electrode lead foil 112a side facing down.
- the combined body is fixed and vibration welding is performed while vibrating the second end plate 140 in the diagonal direction of the substrate 141.
- the second end plate 140 is joined onto the uppermost bipolar plate 120 of the combined body in which all the bipolar plates 120 are joined.
- a joining structure is formed by vibration welding between opposing surfaces of the frames, and for example, three through holes 180 are formed by cutouts of the opposing frames. Then, a lid 190 is further attached to cover the through hole 180 of the bipolar lead acid battery 100.
- the bipolar lead-acid battery 100 can be manufactured by chemically forming it under predetermined conditions.
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Abstract
Description
まず、本発明の実施の形態における双極型鉛蓄電池の全体構成について説明する。図1は、本発明の実施の形態に係る双極型鉛蓄電池100の構造を示す断面図である。なお、図1においては、後述する蓋190の描画を省略している。
この実施の形態の双極型鉛蓄電池100は、例えば、以下に説明する各工程を有する方法で製造することができる。
先ず、バイポーラプレート120の基板121を、第1の凹部121b側を上に向けて作業台に置く。そして第1の凹部121bに接着剤150を塗布し、第1の凹部121b内に正極用鉛箔111aを入れる。その際に、正極用鉛箔111aの貫通穴111cにバイポーラプレート120の柱部123を通す。この接着剤150を硬化させて、基板121の一面に正極用鉛箔111aを貼り付ける。
第1のエンドプレート130の基板131を、凹部131b側を上に向けて作業台に置く。そして凹部131bに接着剤150を塗布し、凹部131b内に正極用鉛箔111aを入れて接着剤150を硬化させる。その際に、正極用鉛箔111aの貫通穴111cにエンドプレート130の柱部133を通す。この接着剤150を硬化させて、基板131の一面に正極用鉛箔111aを貼り付ける。
第2のエンドプレート140の基板141を、凹部141b側を上に向けて作業台に置く。そして凹部141bに接着剤150を塗布し、凹部141b内に負極用鉛箔112aを入れて接着剤150を硬化させる。その際に、負極用鉛箔112aの貫通穴112cに第2のエンドプレート140の柱部143を通す。この接着剤150を硬化させて、基板141の一面に負極用鉛箔112aが貼り付けられた第2のエンドプレート140を得る。
先ず、正極用鉛箔111aおよびカバープレート170が固定された第1のエンドプレート130を、正極用鉛箔111aを上に向けて作業台に置く。そしてカバープレート170の中に正極用活物質層111bを入れて正極用鉛箔111aの上に置く。その際に、正極用活物質層111bの貫通穴111dに第1のエンドプレート130の柱部133を通す。次に、正極用活物質層111bの上に、セパレータ113、負極用活物質層112bを置く。
上述の各プレート同士の積層、接合工程において、枠体の対向面同士の振動溶接による接合構造が形成され、対向する枠体の切り欠き部によって、例えば3つの貫通口180が形成される。そして、さらに双極型鉛蓄電池100の貫通口180を覆うように蓋190が取り付けられる。
110・・・セル部材
111・・・正極
112・・・負極
111a・・・正極用鉛箔
112a・・・負極用鉛箔
111b・・・正極用活物質層
112b・・・負極用活物質層
113・・・セパレータ
120・・・バイポーラプレート
121・・・バイポーラプレートの基板
121a・・・基板の貫通穴
122・・・バイポーラプレートの枠体
130・・・第1のエンドプレート
131・・・第1のエンドプレートの基板
132・・・第1のエンドプレートの枠体
140・・・第2のエンドプレート
141・・・第2のエンドプレートの基板
142・・・第2のエンドプレートの枠体
150・・・接着剤
160・・・導通体
170・・・カバープレート
180・・・貫通口
181・・・外側開口部
182・・・内側開口部
183・・・貫通経路
190・・・蓋
191・・・連通口
a1・・・第1の開口面積
a2・・・第2の開口面積
C・・・セル(セル部材を収容する空間)
Claims (6)
- 正極用集電体と正極用活物質層を有する正極、負極用集電体と負極用活物質層を有する負極、および前記正極と前記負極との間に介在するセパレータを備え、間隔を開けて積層配置された、セル部材と、
複数の前記セル部材を個別に収容する複数の空間を形成する、前記セル部材の前記正極の側および前記負極の側の少なくとも一方を覆う基板と、前記セル部材の側面を囲う枠体と、を含む空間形成部材と、
前記セル部材が収容される前記空間内に貫通する複数の貫通口と、
前記枠体の前記セル部材の1つの側面を囲う部分を覆う蓋と、
を有し、
前記蓋は、前記複数の貫通口と連通する1つの連通口を有することを特徴とする双極型蓄電池。 - 前記貫通口における第1の開口面積の総開口面積が前記1つの連通口の第2の開口面積以上であることを特徴とする請求項1に記載の双極型蓄電池。
- 前記貫通口の前記総開口面積は、前記第2の開口面積の1.5倍以上4倍以下であることを特徴とする請求項2に記載の双極型蓄電池。
- 前記第1の開口面積は、前記第2の開口面積の0.5倍以上4倍未満であることを特徴とする請求項2に記載の双極型蓄電池。
- 前記第1の開口面積は、前記第2の開口面積の0.5倍以上4倍未満であることを特徴とする請求項3に記載の双極型蓄電池。
- 前記正極用集電体及び前記負極用集電体は、鉛又は鉛合金からなることを特徴とする請求項1ないし請求項5のいずれかに記載の双極型蓄電池。
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018106850A (ja) * | 2016-12-22 | 2018-07-05 | 株式会社豊田自動織機 | 注液装置及び注液方法 |
| JP2018170265A (ja) * | 2017-01-31 | 2018-11-01 | 株式会社豊田自動織機 | 蓄電モジュールの検査方法 |
| JP2019192584A (ja) * | 2018-04-27 | 2019-10-31 | 株式会社豊田自動織機 | 蓄電モジュール |
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2023
- 2023-02-27 JP JP2024509881A patent/JPWO2023181796A1/ja active Pending
- 2023-02-27 WO PCT/JP2023/007097 patent/WO2023181796A1/ja not_active Ceased
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018106850A (ja) * | 2016-12-22 | 2018-07-05 | 株式会社豊田自動織機 | 注液装置及び注液方法 |
| JP2018170265A (ja) * | 2017-01-31 | 2018-11-01 | 株式会社豊田自動織機 | 蓄電モジュールの検査方法 |
| JP2019192584A (ja) * | 2018-04-27 | 2019-10-31 | 株式会社豊田自動織機 | 蓄電モジュール |
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