WO2010082255A1 - 非水系電池用正極板、非水系電池用電極群およびその製造方法、並びに、角形非水系二次電池およびその製造方法 - Google Patents
非水系電池用正極板、非水系電池用電極群およびその製造方法、並びに、角形非水系二次電池およびその製造方法 Download PDFInfo
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- WO2010082255A1 WO2010082255A1 PCT/JP2009/006114 JP2009006114W WO2010082255A1 WO 2010082255 A1 WO2010082255 A1 WO 2010082255A1 JP 2009006114 W JP2009006114 W JP 2009006114W WO 2010082255 A1 WO2010082255 A1 WO 2010082255A1
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- positive electrode
- electrode plate
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0583—Construction or manufacture of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or separators
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
- H01M4/0435—Rolling or calendering
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of 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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/021—Physical characteristics, e.g. porosity, surface area
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/028—Positive electrodes
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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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
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49108—Electric battery cell making
- Y10T29/49115—Electric battery cell making including coating or impregnating
Definitions
- the present invention mainly relates to a positive electrode plate for a non-aqueous battery, an electrode group including the positive electrode plate and a manufacturing method thereof, a rectangular non-aqueous secondary battery including the electrode group, and a manufacturing method thereof.
- prismatic lithium secondary batteries which are widely used as driving power sources for portable electronic devices and communication devices, generally use a carbonaceous material capable of occluding and releasing lithium for the negative electrode plate, and the positive electrode plate.
- a composite oxide of lithium and a transition metal such as LiCoO 2 as an active material, and thereby a secondary battery having a high potential and a high discharge capacity is obtained.
- a further increase in capacity is desired.
- a mixture paste obtained by coating the constituent materials of the positive electrode plate and the negative electrode plate is applied and dried on a current collecting core material to form an active material layer.
- a current collecting core material By compressing to a thickness and increasing the packing density of the active material, the capacity can be further increased.
- the relatively viscous non-aqueous electrolyte injected into the battery case is densely laminated or spirally interposed between the positive electrode plate and the negative electrode plate via a separator. Since it becomes difficult to penetrate into the small gaps of the wound electrode group, there is a problem that it takes a long time to impregnate a predetermined amount of the non-aqueous electrolyte.
- the packing density of the active material of the electrode plate is increased, the porosity in the electrode plate is reduced and the electrolyte does not easily permeate, so the impregnation property of the non-aqueous electrolyte into the electrode group is significantly worse. As a result, there is a problem that the distribution of the non-aqueous electrolyte in the electrode group becomes non-uniform.
- the nonaqueous electrolyte guide groove in the infiltration direction of the nonaqueous electrolyte on the surface of the active material layer, the nonaqueous electrolyte is infiltrated into the entire negative electrode, and the width and depth of the groove are increased.
- the impregnation time can be shortened, but conversely, since the amount of active material is reduced, the charge / discharge capacity is reduced, and the reaction between the electrodes is not uniform, and the battery characteristics are deteriorated.
- the width and depth of the groove are set to predetermined values (see, for example, Patent Document 1).
- the groove formed on the surface of the active material layer can cause the electrode plate to break when the electrode plate is wound to form an electrode group. Therefore, as a method for preventing breakage of the electrode plate while improving the impregnation property, the electrode plate is wound by forming a groove on the surface of the electrode plate so as to form an inclination angle with respect to the longitudinal direction of the electrode plate.
- a method for preventing breakage of the electrode plate while improving the impregnation property the electrode plate is wound by forming a groove on the surface of the electrode plate so as to form an inclination angle with respect to the longitudinal direction of the electrode plate.
- a surface of the positive electrode plate or the surface facing the negative electrode plate is provided with a porous film having a partially convex portion, By holding more non-aqueous electrolyte than other parts in the gap formed between the convex part of the porous membrane and the electrode plate, the overcharge reaction is intensively advanced in this part, so that the whole battery
- a method is also proposed in which the progress of overcharging is suppressed and overheating due to overcharging is suppressed (see, for example, Patent Document 3).
- the liquid injection time can be shortened compared to the electrode plate in which no groove is formed, but the liquid is injected because the groove is only formed on one side of the electrode plate.
- the time reduction effect cannot be improved significantly. Therefore, since it takes time to inject the liquid, the effect of suppressing the evaporation amount of the electrolytic solution is low, and it is difficult to significantly reduce the loss of the electrolytic solution. Further, since the groove is formed on one side of the electrode plate, stress is applied to the electrode plate, and therefore the electrode plate is likely to be rounded to the side where the groove is not formed.
- Patent Document 3 when an electrode group is formed by winding a positive electrode plate and a negative electrode plate via a separator, there is a useless non-reactive portion that does not contribute to the battery reaction. Therefore, it is difficult to effectively use the space volume in the battery case, and it is difficult to increase the capacity of the battery.
- a pair of rollers having a plurality of protrusions formed on the surface are arranged above and below the electrode plate, respectively.
- the method of performing groove processing by rotating and moving the roller while pressing the roller on both surfaces of the electrode plate (hereinafter referred to as “roll press processing”) can simultaneously form a plurality of grooves on both surfaces of the electrode plate. Excellent mass productivity.
- the inventors of the present application have been studying various electrode plates in which grooves are formed on both surfaces of the active material layer using roll press processing for the purpose of improving the impregnation property of the electrolytic solution. Found that there is.
- FIGS. 11A to 11C are perspective views illustrating the manufacturing process of the electrode plate 103.
- FIG. 11A a double-sided coating portion 114 in which an active material layer 113 is formed on both sides of a strip-shaped current collecting core material 112, and an active material only on one surface of the current collecting core material 112.
- An electrode plate hoop material 111 having a single-side coated portion 117 on which the layer 113 is formed and a core material exposed portion 118 on which the active material layer 113 is not formed is formed.
- a plurality of groove portions 110 are formed on the surface of the active material layer 113 by roll press processing, and then, as shown in FIG.
- the electrode plate 103 is cut by cutting the electrode plate hoop material 111 along the boundary with the core material exposed portion 118, and then the current collector lead 120 is joined to the core material exposed portion 118 to manufacture the electrode plate 103.
- the active material layer 113 is extended by forming the groove portion 110, whereas the double-sided coating portion 114 extends the active material layer 113 on both sides to the same extent, whereas the single-sided coating portion 117 Since the active material layer 113 is extended only on one side, it is considered that the single-side coated portion 117 is greatly curved and deformed on the side where the active material layer 113 is not formed due to the tensile stress of the active material layer 113.
- the electrode plate 103 When the end of the electrode plate 103 (the core material exposed portion 118 and the one-side coated portion 117 following this) is deformed into a curved shape by cutting the electrode plate hoop material 111, the electrode plate 103 is wound to form the electrode plate electrode group.
- the electrode plate electrode group When configuring, there is a risk of causing winding slippage.
- the electrode plate electrode group is configured by laminating the electrode plates, bending or the like may occur.
- the end of the electrode plate 103 cannot be surely chucked, and there is a possibility that the transport may fail or the active material may fall off. Therefore, not only productivity is lowered, but also reliability of the battery may be lowered.
- the present invention has been made in view of the above-described conventional problems.
- the positive electrode plate for non-aqueous battery, the non-aqueous battery electrode group, and the production thereof which are excellent in the impregnation property of the electrolyte and excellent in productivity and reliability. It is an object of the present invention to provide a method, a prismatic non-aqueous secondary battery, and a manufacturing method thereof.
- the positive electrode plate for a non-aqueous battery of the present invention has an active material layer formed on the surface of a current collecting core.
- the positive electrode plate is a double-sided coated part in which an active material layer is formed on both sides of a current collecting core, and a core exposed part that is an end of the current collecting core and is not formed with an active material layer, It has between the double-sided coating part and the core material exposed part, and the single-sided coating part by which the active material layer was formed only in the single side
- a plurality of grooves that are inclined with respect to the longitudinal direction of the positive electrode plate are formed on both sides of the double-sided coating part, and no groove part is formed on the single-sided coating part.
- a positive electrode current collecting lead is connected to the core material exposed portion.
- the positive electrode plate is wound with the core material exposed portion as a winding end, or folded in a zigzag manner with the core material exposed portion as the outermost layer.
- the electrode group when the electrode group is formed, the electrode group can be prevented from being deformed into a distorted shape due to the thickness of the current collecting lead. Therefore, since the distance between the electrode plates between the negative electrode plate and the positive electrode plate in the electrode group becomes uniform, cycle characteristics can be improved.
- the grooves formed on both surfaces of the double-side coated portion have symmetrical phases. Thereby, damage to the positive electrode plate when forming the groove in the positive electrode plate can be minimized, and the positive electrode plate can be prevented from breaking when the electrode group is formed.
- the depth of the groove formed on both surfaces of the double-side coated portion is preferably in the range of 4 ⁇ m to 20 ⁇ m.
- the grooves formed on both surfaces of the double-side coated portion are preferably formed at a pitch of 100 ⁇ m to 200 ⁇ m along the longitudinal direction of the positive electrode plate. This makes it possible to minimize damage to the positive electrode plate when the groove is formed in the positive electrode plate.
- the grooves formed on both surfaces of the double-side coated portion are formed so as to penetrate from one end surface to the other end surface in the width direction of the positive electrode plate. Thereby, it becomes easy to impregnate electrolyte solution from the end surface of an electrode group, Therefore It is possible to shorten impregnation time.
- the groove portions formed on both surfaces of the double-side coated portion are formed at an angle of 45 ° in different directions with respect to the longitudinal direction of the positive electrode plate, and It is preferable that they intersect each other at right angles. Thereby, since it can avoid forming a groove part in the direction which a positive electrode plate is easy to fracture
- the current collecting lead and the active material layer in the single-side coated portion are located on the same side with respect to the current collecting core. Therefore, it is possible to prevent the electrode group from being deformed into a distorted shape due to the thickness of the current collecting lead when the electrode group is formed. Therefore, since the distance between the electrode plates between the negative electrode plate and the positive electrode plate in the electrode group becomes uniform, cycle characteristics can be improved.
- the electrode group for a non-aqueous battery according to the present invention includes the positive electrode plate for a non-aqueous battery according to the present invention, and the one-side coated portion of the positive electrode is located on the outermost periphery of the electrode group or the outermost electrode group. Located on the surface.
- the surface of the current collecting core member on which the active material layer is not formed in the single-side coated portion of the positive electrode plate constitutes the outermost surface of the electrode group or the outermost surface of the electrode group. It is preferable. Thereby, the waste of forming an active material layer in a location that does not contribute to the battery reaction when functioning as a battery can be eliminated.
- the positive electrode plate and the negative electrode plate are wound through a separator with the core material exposed portion of the positive electrode plate for the non-aqueous battery according to the present invention as a winding end, or
- the positive electrode plate and this negative electrode plate are folded in a folded manner through a separator with the core material exposed portion of the positive electrode plate for a non-aqueous battery of the present invention as the outermost layer.
- the prismatic non-aqueous secondary battery of the present invention includes the non-aqueous battery electrode group of the present invention.
- a plurality of grooves that are inclined with respect to the longitudinal direction of the positive electrode plate are formed on both sides of the double-side coated part, and no groove is formed on the single-side coated part. Therefore, the impregnation property of the electrolytic solution can be improved, and the core material exposed portion of the positive electrode plate and the subsequent single-side coated portion can be prevented from being greatly deformed into a curved shape.
- winding is performed with the core material exposed portion of the positive current collecting core material connected to the positive current collecting lead as the winding end, or the positive current collecting core material connected to the positive current collecting lead Fold it in a zigzag manner with the core exposed part as the outermost layer. Therefore, there is no protrusion of the positive current collecting lead on the innermost peripheral side of the electrode group, and therefore, when the electrode group is formed, the electrode group is prevented from being deformed into a distorted shape due to the thickness of the current collecting lead. it can. Thereby, in the electrode group, the distance between the electrode plates between the positive electrode and the negative electrode becomes uniform, so that the cycle characteristics can be improved.
- FIG. 1 is a partially cutaway perspective view showing the configuration of a prismatic nonaqueous secondary battery according to an embodiment of the present invention.
- FIG. 2A is a perspective view of the positive electrode hoop material in the manufacturing process of the positive electrode plate for a battery according to one embodiment of the present invention
- FIG. 2B is a perspective view of the positive electrode material hoop material constituting the groove in the same process.
- FIG. 2C is a perspective view of the positive electrode plate in the same process.
- FIG. 3 is a partial cross-sectional view of an electrode group in one embodiment of the present invention.
- FIG. 4 is a partially enlarged plan view of the positive electrode plate for a battery according to one embodiment of the present invention.
- FIG. 1 is a partially cutaway perspective view showing the configuration of a prismatic nonaqueous secondary battery according to an embodiment of the present invention.
- FIG. 2A is a perspective view of the positive electrode hoop material in the manufacturing process of the positive electrode plate for a battery according to one embodiment of
- FIG. 5 is an enlarged cross-sectional view along the line AA in FIG.
- FIG. 6 is a perspective view showing a method of forming a groove on the surface of the double-side coated portion in one embodiment of the present invention.
- FIG. 7 is a schematic diagram showing an overall configuration of a battery positive plate production apparatus according to an embodiment of the present invention.
- FIG. 8 is an enlarged perspective view showing the configuration of the groove processing mechanism 28 in the embodiment of the present invention.
- FIG. 9A is a longitudinal sectional view of the grooving roller in one embodiment of the present invention
- FIG. 9B is a cross-sectional view taken along line BB of the grooving roller in the same embodiment (FIG. 9A).
- FIG. 9A is a longitudinal sectional view of the grooving roller in one embodiment of the present invention
- FIG. 9B is a cross-sectional view taken along line BB of the grooving roller in the same embodiment (FIG. 9A).
- FIG. 9A is a
- FIG. 9C is a cross-sectional view of the grooving ridge of the grooving roller according to the embodiment.
- FIG. 10 is a side view of the groove machining mechanism portion according to the embodiment of the present invention.
- FIG. 11A is a perspective view of a positive electrode hoop material in a manufacturing process of a conventional positive electrode plate for a battery
- FIG. 11B is a perspective view of a positive electrode material hoop material forming a groove portion in the same process.
- (C) is a perspective view of the positive electrode plate in the same process.
- FIG. 12 is a perspective view illustrating a problem in a conventional battery positive electrode plate.
- FIG. 1 is a partially cutaway perspective view of a square non-aqueous secondary battery 15.
- a rectangular non-aqueous secondary battery 15 shown in FIG. 1 includes a positive electrode plate 2 using a composite lithium oxide as an active material and a negative electrode plate 3 using a material capable of holding lithium as an active material, and a separator 4 between them.
- An electrode group 1 is provided that is wound into a spiral shape and then processed into a flat shape.
- This rectangular non-aqueous secondary battery 15 is produced according to the method described below.
- This electrode group 1 is housed together with an insulating plate 5 in a bottomed flat battery case 7.
- the negative current collecting lead 16 drawn from the upper part of the electrode group 1 is connected to the terminal 6 (the insulating gasket 8 is attached to the periphery of the terminal 6), and then drawn from the upper part of the electrode group 1.
- the positive current collecting lead 20 is connected to the sealing plate 9. Subsequently, after the sealing plate 9 is inserted into the opening of the battery case 7, the sealing plate 9 and the battery case 7 are welded along the outer periphery of the opening of the battery case 7. Thereby, the opening part of the battery case 7 is sealed. Thereafter, a non-aqueous electrolyte solution (not shown) made of a non-aqueous solvent is injected into the battery case 7 from the plug opening 45, and then the plug 46 is welded to the sealing plate 9. Thus, the square non-aqueous secondary battery 15 can be produced.
- FIGS. 2A to 2C are perspective views showing the manufacturing process of the positive electrode plate 2.
- FIG. 3 is a partial cross-sectional view of the electrode group 1.
- FIG. 2 (a) shows the positive electrode plate hoop material 11 before being divided into individual positive electrode plates 2, on both sides of a current collecting core material 12 made of a long strip of copper foil having a thickness of 10 ⁇ m.
- the positive electrode active material layer 13 is formed by roll pressing and compressing so that the total thickness becomes 200 ⁇ m, and this is slit to have a width of about 60 mm It is.
- a positive electrode active material and a binder are put in an appropriate dispersion medium, mixed and dispersed by a dispersing machine such as a planetary mixer, and the optimum viscosity for application to the current collecting core 12 such as an aluminum foil.
- the positive electrode mixture paint is prepared by kneading while adjusting.
- the positive electrode active material for example, lithium cobaltate and modified products thereof (such as lithium cobaltate in which aluminum or magnesium is dissolved), lithium nickelate and modified products thereof (partially nickel is substituted with cobalt) Composite oxides such as lithium manganate and modified products thereof.
- carbon black such as acetylene black, ketjen black, channel black, furnace black, lamp black and thermal black, and various graphites may be used alone or in combination.
- binder for the positive electrode for example, polyvinylidene fluoride (PVdF), a modified polyvinylidene fluoride, polytetrafluoroethylene (PTFE), a rubber particle binder having an acrylate unit, and the like can be used.
- PVdF polyvinylidene fluoride
- PTFE polytetrafluoroethylene
- a rubber particle binder having an acrylate unit for example, polyvinylidene fluoride (PVdF), a modified polyvinylidene fluoride, polytetrafluoroethylene (PTFE), a rubber particle binder having an acrylate unit, and the like can be used.
- PVdF polyvinylidene fluoride
- PTFE polytetrafluoroethylene
- the positive electrode mixture paint described above is applied to the current collecting core 12 to a predetermined thickness to form the positive electrode active material layer 13, and after being dried, after being pressed to a predetermined thickness almost entirely, The positive electrode plate 2 can be produced.
- One electrode plate component 19 is composed of the single-side coated portion 17 and the core material exposed portion 18 in which the positive electrode active material layer 13 is not formed on the current collecting core 12, and this electrode plate configuration The part 19 is formed continuously in the longitudinal direction.
- the electrode plate component 19 in which such a positive electrode active material layer 13 is partially provided can be easily formed by coating and forming the positive electrode active material layer 13 by a known intermittent coating method.
- FIG. 2B shows the surface of the positive electrode active material layer 13 on both sides in the double-side coated portion 14 without forming the groove 10 in the positive electrode active material layer 13 of the single-side coated portion 17 with respect to the positive electrode plate hoop material 11. The state which formed the groove part 10 only in FIG.
- the positive electrode plate hoop material 11 in which the groove portion 10 is formed is separated for each electrode plate component portion 19 by cutting the core material exposed portion 18 adjacent to the double-side coated portion 14 with a cutter. After that, a positive current collecting lead 20 is attached to the current collecting core 12 of the core exposed portion 18 by welding, and the positive current collecting lead 20 is covered with an insulating tape 21 to form a rectangular non-aqueous secondary battery 15. The positive electrode plate 2 is completed.
- the positive electrode plate 2 produced in this way has a double-sided coating part 14, a single-sided coating part 17, and a core material exposed part 18, as shown in FIG. 2 (c).
- a plurality of grooves 10 inclined with respect to the longitudinal direction of the positive electrode plate 2 are formed on both surfaces of the double-side coated portion 14, while the groove portions 10 are not formed on the single-side coated portion 17.
- the core material exposed portion 18 is located at an end portion of the positive electrode plate 2 (specifically, an end portion in the longitudinal direction of the positive electrode plate 2), and the positive electrode current collecting lead 20 is connected to the core material exposed portion 18. ing.
- the positive electrode plate 2 and the negative electrode plate 3 are spirally wound in the direction of the arrow Y with the separator 4 interposed therebetween to constitute the electrode group 1 in the present embodiment.
- the positive electrode plate 2 By configuring the positive electrode plate 2 as described above, the following effects can be obtained. That is, since the groove portion 10 is not formed in the positive electrode active material layer 13 of the single-side coated portion 17, the core material exposed portion 18 of the positive electrode plate 2 is cut in the cutting of the positive electrode plate hoop material 11 shown in FIG. And the subsequent single-side coating portion 17 can be prevented from being greatly deformed into a curved shape. Thereby, the winding shift
- the positive electrode plate 2 when the positive electrode plate 2 is wound by a winding machine, it is prevented from being greatly deformed into a curved shape, so that it is possible to prevent troubles at the time of conveyance that fail in the chuck and dropping of the positive electrode active material. As a result, it is possible to realize a positive electrode plate for a battery that is excellent in the impregnation property of the electrolytic solution and is excellent in productivity and reliability.
- the positive electrode plate 2 and the negative electrode plate 3 were spirally wound through the separator 4 to form the electrode group 1, a positive electrode current collecting lead 20 was attached as shown in FIG.
- the core material exposed portion 18 is wound as a winding end.
- the electrode group is deformed into a distorted shape due to the thickness of the current collecting lead when forming the electrode group. Can be prevented. Therefore, the electrode group 1 can be easily stored in the battery case 7. Further, since the distance between the electrode plates between the negative electrode plate 3 and the positive electrode plate 2 in the electrode group 1 becomes uniform, the cycle characteristics can be improved.
- the core material exposed portion 18 to which the positive electrode current collecting lead 20 is attached is wound as a winding end.
- the surface where the positive electrode active material layer 13 does not exist in the single-side coated portion 17 of the positive electrode plate 2 is defined as the outermost peripheral surface of the electrode group 1.
- the outermost peripheral surface of the electrode group 1 does not face the negative electrode plate 3.
- the positive electrode active material layer 13 does not exist in the single-side coated portion 17 of the positive electrode plate 2 is the outermost peripheral surface of the electrode group 1, the positive electrode active material layer is placed at a location that does not contribute to the battery reaction when functioning as a battery.
- the waste of forming 13 can be eliminated. Therefore, the space volume in the battery case 7 can be used effectively, and the capacity of the battery can be increased accordingly.
- the positive electrode current collecting lead 20 joined to the core material exposed portion 18 of the positive electrode plate 2 is the same surface as the surface on which the positive electrode active material layer 13 of the single-side coated portion 17 is formed (electrode group 1 Is located on the innermost surface). Therefore, since the shape of the formed electrode group 1 can be maintained, the electrode group 1 can be easily accommodated in the battery case 7 and the cycle characteristics can be further improved.
- burrs may occur when the positive current collecting lead 20 is cut. If the positive current collecting lead 20 is connected to the inner surface of the outermost peripheral portion of the electrode group 1, the generated burr is positioned in the outer peripheral direction of the electrode group 1. Therefore, it can be prevented that the burr penetrates the positive electrode current collecting lead 20 and thus contacts the positive electrode active material layer 13 on the inner peripheral side.
- the negative electrode plate 3 is configured by forming negative electrode active material layers containing a material capable of holding lithium on both surfaces of a negative electrode current collecting core.
- FIG. 4 is a partially enlarged plan view of the positive electrode plate 2 in the present embodiment.
- Each groove portion 10 formed in each of the positive electrode active material layers 13 on both sides of the double-side coated portion 14 is formed at an inclination angle ⁇ of 45 ° in different directions on both sides with respect to the longitudinal direction of the positive electrode plate 2, Three-dimensional crossing at right angles to each other.
- Both groove portions 10 on both sides are formed at the same pitch and in parallel with each other, and each groove portion 10 is also one end surface of the positive electrode active material layer 13 in the width direction (perpendicular to the longitudinal direction). It penetrates through to the other end surface.
- the inclination angle ⁇ is not limited to 45 °, and may be in the range of 30 ° to 90 °. In this case, the groove portions 10 formed on both surfaces of the double-side coated portion 14 only need to be three-dimensionally crossed with the phases being symmetric.
- FIG. 5 is an enlarged cross-sectional view taken along the line AA in FIG. 4, and shows the cross-sectional shape and arrangement pattern of the groove 10.
- the grooves 10 are formed at a pitch P of 170 ⁇ m on any surface of the double-side coated portion 14.
- the groove part 10 is formed in a substantially inverted trapezoidal cross-sectional shape.
- the groove portion 10 in this embodiment has a depth D of 8 ⁇ m, the walls of the groove portions 10 on both sides are inclined at an angle ⁇ of 120 °, and the bottom corner of the groove portion 10 that is the boundary between the bottom surface and the walls of the groove portions 10 on both sides
- the part has an arcuate cross-sectional shape having a curvature R of 30 ⁇ m.
- the pitch P of the groove 10 will be described.
- the pitch P of the groove portion 10 is smaller, the number of groove portions 10 formed is increased, the total cross-sectional area of the groove portion 10 is increased, and the pouring property of the electrolytic solution is improved.
- three types of positive electrode plates 2 having a depth D of 8 ⁇ m and a pitch P of 80 ⁇ m, 170 ⁇ m and 260 ⁇ m formed with groove portions 10 are formed, and three types of electrodes using these positive electrode plates 2 are formed.
- the group 1 was accommodated in the battery case 7, and the injection time of electrolyte solution was compared.
- the injection time when the pitch P is 80 ⁇ m is about 20 minutes
- the injection time when the pitch P is 170 ⁇ m is about 23 minutes
- the injection time when the pitch P is 260 ⁇ m is about 30 minutes. It was found that the smaller the pitch P of 10, the better the pouring property of the electrolytic solution into the electrode group 1.
- the pitch P of the groove portions 10 is set to less than 100 ⁇ m, the pouring property of the electrolytic solution is improved, but the number of compressed portions of the positive electrode active material layer 13 by the many groove portions 10 increases, and the packing density of the active material is high.
- the pitch P of the groove portion 10 is set to a size exceeding 200 ⁇ m, the current collecting core material 12 is extended and a large stress is applied to the positive electrode active material layer 13, and the resistance from the current collecting core material 12 is increased. The peel strength is lowered and the active material is easily dropped off.
- the grooving ridges of the grooving rollers 31 and 30 are formed on the positive electrode active material layer 13 of the double-side coated portion 14.
- the groove machining ridges 31a and 30a are three-dimensional with respect to each other when the load by the groove machining ridges 31a and 30a is simultaneously offset at the same position.
- the intersecting portion in other words, the groove portion 10 formed on the surface of the double-side coated portion 14 is only a portion where the three-dimensionally intersect with each other, and the other portions are used for collecting the load by the groove processing protrusions 31a and 30a. It is received only by the core material 12.
- the pitch P of the groove portions 10 when the groove portions 10 of the double-side coated portion 14 are formed so as to be orthogonal to each other, when the pitch P of the groove portions 10 is increased, the span that receives the load by the groove machining ridges 31a and 30a becomes longer and the current collecting is performed. Since the burden on the core material 12 is increased, the current collecting core material 12 is extended. As a result, the active material is peeled off in the positive electrode active material layer 13 or the active material is collected. The peel strength of the positive electrode active material layer 13 with respect to the current collecting core 12 decreases.
- the positive electrode plate 2 in which the groove portions 10 were formed with a long pitch P of 260 ⁇ m showed that the current collecting core material 12 was bent It was confirmed that the part was slightly peeled off from the current collecting core 12 and floated.
- the pitch P of the groove 10 is set within a range of 100 ⁇ m to 200 ⁇ m.
- the groove portion 10 is formed so as to three-dimensionally intersect with each other in the double-side coating portion 14, distortion generated in the positive electrode active material layer 13 when the groove processing protrusions 31 a and 30 a bite into the positive electrode active material layer 13. Have the advantage of canceling each other out. Further, when the groove portions 10 are formed at the same pitch P, the distance between the adjacent groove portions 10 at the three-dimensional intersection of each groove portion 10 is the shortest, so that the burden on the current collecting core material 12 can be reduced. The peel strength of the substance from the current collecting core 12 is increased, and the active material can be effectively prevented from falling off.
- groove portions 10 are formed on both surfaces of the positive electrode plate 2 so as to cross each other three-dimensionally, and by impregnating the electrolyte solution through the groove portions 10, the impregnation property of the electrolyte solution into the electrode group 1 can be improved. I am trying.
- the groove part 10 is formed in a pattern in which the phases are symmetrical with each other in the double-side coated part 14, the elongation of the positive electrode active material layer 13 generated by forming the groove part 10 is the positive electrode active material on both sides. It occurs equally in the material layer 13 and no distortion remains after the groove 10 is formed.
- the groove portions 10 are formed on both surfaces of the double-side coated portion 14, a larger cycle life can be obtained because a larger amount of electrolyte can be held uniformly than when the groove portions 10 are formed only on one surface. Can be secured.
- the pouring property (impregnation property) of the electrolytic solution into the electrode group 1 is improved as the depth D of the groove portion 10 is increased.
- three types of positive electrode plates 2 are formed on the positive electrode active material layer 13 of the double-side coated portion 14 with a pitch P of 170 ⁇ m and a groove portion 10 having a depth D of 3 ⁇ m, 8 ⁇ m, and 25 ⁇ m, respectively.
- three types of electrode groups 1 are manufactured by winding the positive electrode plate 2 and the negative electrode plate 3 with the separator 4 interposed therebetween, and the electrode group 1 is accommodated in the battery case 7 so that the electrolyte is supplied to the electrode group.
- the injection time permeating into 1 was compared.
- the injection time is about 45 minutes
- the injection time is about 23 minutes
- the injection time was about 15 minutes.
- the depth D of the groove portion 10 when the depth D of the groove portion 10 is increased, the pouring property of the electrolytic solution is improved, but the active material in the portion where the groove portion 10 is formed is abnormally compressed, so that lithium ions cannot freely move. As a result, the acceptability of lithium ions becomes poor, and lithium metal may be easily deposited. Further, when the depth D of the groove portion 10 is increased, the thickness of the positive electrode plate 2 is increased accordingly, and the extension of the positive electrode plate 2 is increased, so that the active material is easily peeled off from the current collecting core material 12.
- the thickness of the positive electrode plate 2 is increased, in the winding process for forming the electrode group 1, when the active material is separated from the current collecting core 12 or when the electrode group 1 is inserted into the battery case 7, Production troubles such as the electrode group 1 whose diameter increases with the increase in the thickness of the positive electrode plate 2 rubs against the opening end surface of the battery case 7 and becomes difficult to insert occur.
- the active material is easily peeled off from the current collecting core 12, the conductivity is deteriorated and the battery characteristics are impaired.
- the peel strength of the active material from the current collecting core 12 decreases as the depth D of the groove portion 10 increases. That is, as the depth D of the groove portion 10 increases, the thickness of the positive electrode active material layer 13 increases. This increase in thickness is in the direction of peeling the active material from the current collecting core 12. Since a large force acts, the peel strength decreases.
- the peel strength was about 4 N / m, about 5 N / m, about 6 N / m, and about 7 N / m in the descending order of the depth D, and as the depth D of the groove portion 10 increased. It has been demonstrated that the peel strength decreases.
- the depth D of the groove 10 when the depth D of the groove portion 10 is set to be less than 4 ⁇ m, the liquid injection property (impregnation property) of the electrolytic solution becomes insufficient, whereas when the depth D of the groove portion 10 is set to a size exceeding 20 ⁇ m, Since the peel strength of the active material from the current collecting core 12 is reduced, there is a risk that the battery capacity may be reduced or the dropped active material may penetrate the separator 4 and contact the positive electrode plate 2 to cause an internal short circuit. is there. Accordingly, if the depth D is made as small as possible and the number of grooves 10 is increased, the occurrence of problems can be prevented and a good electrolyte injection property can be obtained. Therefore, the depth D of the groove portion 10 needs to be set within a range of 4 ⁇ m or more and 20 ⁇ m or less, preferably within a range of 5 to 15 ⁇ m, more preferably within a range of 6 to 10 ⁇ m.
- the pitch P of the groove portion 10 is set to 170 ⁇ m and the depth D of the groove portion 10 is set to 8 ⁇ m is illustrated, but the pitch P may be set within a range of 100 ⁇ m or more and 200 ⁇ m or less.
- the depth D of the groove 10 may be set in the range of 4 ⁇ m to 20 ⁇ m, more preferably in the range of 5 to 15 ⁇ m, and still more preferably in the range of 6 to 10 ⁇ m.
- the groove portion 10 when the groove portion 10 is not formed on both surfaces immediately after the injection, the area where the positive electrode plate 2 is impregnated with the electrolytic solution remains 60% of the whole, and when the groove portion 10 is formed only on one surface, the groove portion 10 On the surface where the electrolyte was impregnated, the area impregnated with the electrolytic solution was 100% of the whole, but on the surface where the groove 10 was not formed, the area impregnated with the electrolytic solution was about 80% of the whole. there were. On the other hand, when the groove part 10 was formed on both surfaces, the area where the electrolyte solution was impregnated on both surfaces was 100% of the whole.
- each battery was disassembled and observed every hour in order to grasp the time until the electrolyte solution was impregnated into the entire positive electrode plate 2.
- the electrolyte solution is 100% impregnated on both surfaces immediately after injection, whereas in the positive electrode plate 2 in which the groove portions 10 are formed on only one surface, the groove portions 10 are formed.
- 100% of the electrolyte was impregnated after 2 hours.
- the electrolyte solution was 100% impregnated on both surfaces after 5 hours. The liquid was unevenly distributed.
- the positive electrode plate 2 in which the groove part 10 is formed on both surfaces is completely impregnated with the electrolyte as compared with the negative electrode plate 3 in which the groove part 10 is formed on only one side. It can be confirmed that the time until the battery is shortened to about 1 ⁇ 2 and the cycle life as a battery is increased.
- the battery during the cycle test was disassembled, and the distribution of the electrolytic solution was examined with respect to the electrode plate in which the groove 10 was formed only on one side, and EC (ethylene carbonate) which is the main component of the nonaqueous electrolytic solution was the electrode plate.
- the cycle life was verified by how much was extracted per unit area. As a result, regardless of the sampling site, the surface on which the groove portion 10 was formed had about 0.1 to 0.15 mg more EC than the surface on which the groove portion 10 was not formed.
- the EC is present most on the surface of the electrode plate and is uniformly impregnated without uneven distribution of the electrolyte, but on the surface where the groove portions 10 are not formed, the electrolyte solution As the amount of liquid decreases, the internal resistance increases and the cycle life is shortened.
- the groove part 10 is formed in a penetrating shape that leads from one end face in the width direction of the positive electrode active material layer 13 to the other end face, thereby significantly improving the pouring property of the electrolyte into the electrode group 1. Time can be significantly reduced. In addition to this, since the impregnation property of the electrolytic solution into the electrode group 1 is remarkably improved, it is possible to effectively suppress the occurrence of the liquid withdrawing phenomenon at the time of charging and discharging as a battery. It is possible to suppress the uneven distribution of the electrolytic solution.
- the groove portion 10 is formed at an angle inclined with respect to the longitudinal direction of the positive electrode plate 2, the impregnation property of the electrolytic solution into the electrode group 1 is improved, and stress is generated in the winding process for forming the electrode group 1. Can be suppressed, and the electrode plate of the positive electrode plate 2 can be effectively prevented from being cut.
- a pair of grooving rollers 31 and 30 are arranged with a predetermined gap, and the positive electrode plate hoop material 11 shown in FIG. 2A is passed through the gap between the grooving rollers 31 and 30.
- the groove portion 10 having a predetermined shape can be formed in the positive electrode active material layer 13 on both sides of the double-side coated portion 14 in the positive electrode plate hoop material 11.
- the grooving rollers 31 and 30 are both the same, and a large number of grooving protrusions 31a and 30a are formed in a direction having a twist angle of 45 ° with respect to the axial direction.
- the grooving protrusions 31a and 30a are formed so that a ceramic layer is formed by spraying chromium oxide on the entire surface of the iron roller base to form a ceramic layer, and then a laser is irradiated on the ceramic layer to form a predetermined pattern. By partially melting, it can be formed easily and with high accuracy.
- the grooving rollers 31 and 30 are substantially the same as what is generally called a ceramic laser engraving roll used in printing.
- the hardness is HV1150 or more, and since it is a fairly hard material, it is resistant to sliding and wear, and is several tens of times that of an iron roller. The above lifetime can be secured.
- the positive electrode plate hoop material 11 is passed through the gap between the groove processing rollers 31 and 30 on which a large number of groove forming protrusions 31a and 30a are formed, as shown in FIG.
- the groove portions 10 that three-dimensionally intersect each other at right angles can be formed.
- the groove-projecting ridges 31a and 30a can form the groove 10 having the cross-sectional shape shown in FIG. 5, that is, an arc shape having a tip portion angle ⁇ of 120 ° and a curvature R of 30 ⁇ m. It has a cross-sectional shape.
- the reason why the angle ⁇ of the tip is set to 120 ° is that the ceramic layer is easily damaged when set to a small angle of less than 120 °.
- the reason why the curvature R of the tips of the groove machining ridges 31a and 30a is set to 30 ⁇ m is that when the groove machining ridges 31a and 30a are pressed against the positive electrode active material layer 13 to form the groove 10. This is for preventing the occurrence of cracks in the positive electrode active material layer 13.
- the height of the groove machining protrusions 31a and 30a is set to about 20 to 30 ⁇ m because the most preferable depth D of the groove portion 10 to be formed is in the range of 6 to 10 ⁇ m. This is because, if the height of the groove forming ridges 31a and 30a is too low, the peripheral surfaces of the groove forming protrusions 31a and 30a of the groove forming rollers 31 and 30 come into contact with the positive electrode active material layer 13, This is because the positive electrode active material peeled off from the material layer 13 adheres to the peripheral surfaces of the groove processing rollers 31 and 30, and therefore it is necessary to set the height higher than the depth D of the groove 10 to be formed.
- the rotational driving of the grooving rollers 31 and 30 is such that a rotational force from a servo motor or the like is transmitted to one grooving roller 30, and the rotation of the grooving roller 30 is applied to each roller shaft of the grooving rollers 31 and 30, respectively. It is transmitted to the other grooving roller 31 via a pair of gears 44 and 43 that are axially engaged and meshed with each other, so that the grooving rollers 31 and 30 rotate at the same rotational speed.
- the groove portion 10 By the way, as a method of forming the groove portion 10 by causing the groove ridges 31 a and 30 a of the groove processing rollers 31 and 30 to bite into the positive electrode active material layer 13, the groove portion 10 to be formed by the gap between the groove processing rollers 31 and 30.
- the rotational driving force is transmitted by utilizing the correlation between the sizing method for setting the depth D of the groove, the pressure applied to the grooving protrusions 31a and 30a and the depth D of the groove 10 to be formed.
- the positive electrode plate hoop material 11 is formed on the groove processing roller without forming the groove portion 10 with respect to the positive electrode active material layer 13 of the single-side coated portion 17 in the positive electrode plate hoop material 11. It is necessary to be able to pass through the gap between 31 and 30. This can be dealt with by providing a stopper between the grooving rollers 31 and 30 and holding the grooving roller 31 in a non-pressed state with respect to the single-side coated portion 17.
- the “non-pressed state” means a state (including a non-contact state) in which the groove 10 is not formed on the single-side coated portion 17.
- the thickness of the double-side coated portion 14 is only about 200 ⁇ m, and when forming the groove portion 10 having a depth D of 8 ⁇ m in such a thin double-side coated portion 14, It is necessary to increase the processing accuracy of forming the groove 10. Therefore, the bearing portions of the groove processing rollers 31 and 30 are only gaps necessary for the bearings to rotate, and the roller shafts and the bearings are fitted with no gaps, and the bearings and the bearings that hold the bearings. It is preferable to configure in a fitting form in which no gap exists between the holder and the holder.
- both the groove processing rollers 31 and 30 can let the positive electrode plate hoop material 11 pass through each gap
- FIG. 7 is a diagram schematically showing the overall configuration of the battery positive plate manufacturing apparatus according to the present embodiment.
- the supply-side dancer roller mechanism 24 (the upper side 3 Two supporting rollers 24a and two lower dancing rollers 24b), and a meandering prevention roller mechanism 27 (four rollers 27a arranged in a rectangular shape) in this order, It is supplied to the processing mechanism unit 28.
- the groove processing mechanism section 28 includes a supply-side winding guide roller 29, a groove processing roller 30, a groove processing roller 31, an auxiliary driving roller 32, and an extraction-side winding guide roller 33. .
- the positive electrode plate hoop material 11 having the configuration shown in FIG. 2A passes through the groove processing mechanism portion 28, and as shown in FIG. 2B, the positive electrode active material on both sides of the double-side coating portion 14
- the groove portion 10 is formed only in the layer 13, and the groove-processed positive electrode plate hoop material 11 is connected to a take-out side dancer roller mechanism 37 (an upper support roller 37 a and a lower side via a direction changing guide roller 34. 2) and then passes between the secondary drive roller 38 and the conveyance auxiliary roller 39 to take up the dancer roller mechanism 40 for winding adjustment (the upper 3).
- One support roller 40a and two dancing rollers 40b on the lower side and finally winds around the coiler 42 through the winding-side guide roller 41.
- the support rollers 24a and 37a are provided at fixed positions, and the dancing rollers 24b and 37b are provided so as to be movable up and down, so that the tension relating to the positive electrode plate hoop material 11 being transferred is likely to change. Accordingly, the dancing rollers 24b and 37b are automatically moved up and down, so that the tension acting on the positive electrode plate hoop material 11 is always kept constant. Accordingly, since the predetermined tension is always maintained between the dancer roller mechanisms 24 and 37 in the positive electrode plate hoop material 11, the groove processing mechanism portion 28 has only a predetermined conveying force applied to the positive electrode plate hoop material 11. It is possible to transfer at a transfer speed.
- the tension on the groove processing mechanism portion 28 side and the coiler 42 side in the positive electrode plate hoop material 11 is set independently, so that the winding of the positive electrode plate hoop material 11 around the coiler 42 is tightly wound at the start of winding.
- the rotational speed of the secondary drive roller 38 and the vertical position of the dancing roller 40b of the winding roller 40 for winding adjustment are automatically adjusted so as to gradually and gradually wind as the winding diameter increases. It is like that.
- the positive plate hoop material 11 in which the groove portion 10 is formed is wound around the coiler 42 in a favorable winding state without winding deviation.
- FIG. 8 is an enlarged perspective view showing the configuration of the groove processing mechanism portion 28 of FIG.
- the grooving roller 30 and the grooving roller 31 are both the same, and a large number of grooving ridges 30a, 31a are formed in a direction that forms a twist angle of 45 ° with respect to the axis of the grooving roller 30. If the fixed and movable grooving rollers 30 and 31 are arranged vertically and the positive electrode hoop material 11 is passed through the gap, as shown in FIG. In the positive electrode active material layer 13 on both side surfaces of the groove 14, the groove portions 10 that three-dimensionally intersect at right angles with each other on the both surface sides with respect to the longitudinal direction thereof can be formed.
- the grooving roller 30 is installed at a fixed position, and the grooving roller 31 is installed so as to move up and down within a predetermined small movement range.
- the rotational drive to the grooving rollers 30 and 31 is such that a rotational force from a servo motor or the like is transmitted to the grooving roller 30, and the rotation of the grooving roller 30 is applied to the roller shafts 30b and 31b of the grooving rollers 30 and 31. It is transmitted to the grooving roller 31 through a pair of gears 43 and 44 that are fitted and meshed with each other, so that the grooving rollers 30 and 31 rotate at the same rotational speed.
- the supply-side winding guide roller 29 and the extraction-side winding guide roller 33 are relatively arranged with respect to the groove processing roller 30 so that the positive electrode plate hoop material 11 can be wound around substantially the half circumference of the outer peripheral surface of the groove processing roller 30.
- an auxiliary driving roller 32 having a flat surface without a groove-forming protrusion is provided at a position upstream of the take-up-side winding guide roller 33 in the positive electrode plate hoop material 11.
- the positive electrode plate hoop material 11 is pressed to 30 with a small pressing force.
- the auxiliary drive roller 32 is pressed against a portion of the positive electrode plate hoop material 11 wound around the groove processing roller 30 by the take-out side winding guide roller 33.
- FIG. 9 is a view showing a state of the grooving rollers 30 and 31 when the single-side coated portion 17 of the positive electrode plate hoop material 11 passes through the gap between the grooving roller 30 and the grooving roller 31.
- FIG. 9A is a longitudinal sectional view taken along a cutting line passing through the centers of the grooving rollers 30 and 31, and
- FIG. 9B is a sectional view taken along the line BB in FIG. 9A.
- the roller shafts 30b and 31b of the grooving rollers 30 and 31 are rotatably supported by a pair of ball bearings 47 and 48, respectively, in the vicinity of both ends thereof.
- roller shafts 30b and 31b of the groove processing rollers 30 and 31 are supported by a press-fitting form with no gap between the ball bearings 47 and 48, and between the roller shafts 30b and 31b and the ball bearings 47 and 48. There is only a gap necessary for the ball bearings 47 and 48 to rotate. Further, in the ball bearings 47 and 48, the balls 47a and 48a and the bearing holders 47b and 48b are configured in a fitting form by press-fitting with no gap between them.
- the positive electrode plate hoop material 11 passes through the gap between the groove processing rollers 30 and 31 without forming the groove portion 10 in the one-side coated portion 17 of the positive electrode plate hoop material 11.
- the stopper 49 prevents the grooving roller 31 from approaching the grooving roller 30 beyond the minimum gap between the grooving rollers 30 and 31 for not forming the groove 10 in the single-side coated portion 17. is there.
- the positive electrode plate hoop material 11 can be passed between the groove processing rollers 30 and 31 without forming the groove portion 10 in the single-side coated portion 17.
- the thickness of the double-side coated portion 14 is only about 120 ⁇ m, and the groove portion 10 having a depth D of 8 ⁇ m is formed with high accuracy of ⁇ 1 ⁇ m in the thin double-side coated portion 14.
- the groove portion 10 having a depth D of 8 ⁇ m is formed with high accuracy of ⁇ 1 ⁇ m in the thin double-side coated portion 14.
- the groove processing mechanism section 28 includes the following constant pressure type groove processing mechanism 28 in order to form the groove section 10 with high accuracy.
- the groove machining roller 31 is configured so that two air cylinders 50 and 51 are pressurized by two air cylinders 50 and 51, respectively.
- the air pipes 52 and 53 for supplying the water are branched from the same air path and set to the same pipe length so that the same pressure is always applied to the two portions of the roller shaft 31b.
- a precision pressure reducing valve 54 is disposed at a branch point of the air pipes 52 and 53. This precision pressure reducing valve (pressure adjusting means) 54 can always supply the air pressure supplied from the air pump 57 to the air cylinders 50 and 51 while keeping the air pressure at a set value.
- the double-side coated portion 14 of the positive electrode plate hoop material 11 is adjusted so that the positive electrode active material layer 13 is rolled by a roll press to have the same thickness as a whole, but still has a thickness of 1 to 2 ⁇ m. There are variations in thickness.
- the precision pressure reducing valve 54 automatically discharges excess air so as to always maintain a predetermined pressure. To work. Thereby, the air pressure of the air cylinders 50 and 51 is automatically adjusted so as to always become a predetermined set pressure regardless of the variation in the thickness of the double-side coated part 14.
- the amount of biting into the positive electrode active material layer 13 of the groove forming protrusions 30a, 31a of the fixed and movable groove processing rollers 30, 31 is always constant regardless of the variation in the thickness of the double-side coated part 14,
- the groove portion 10 having a predetermined depth D can be accurately formed.
- a hydraulic cylinder or a servo motor may be used.
- the groove processing roller 31 is adapted to receive the rotational force from the groove processing roller 30 by meshing the gears 44 and 43 only from one side of the roller shaft 31b, but also on the other side of the roller shaft 31b.
- a gear 44 having the same weight as the side gear 44 is provided.
- the other side gear 44 functions as a balancer. Therefore, the gear 44 on the other side may be replaced with a disk-shaped balance. Thereby, the pressing force of the groove processing roller 31 is applied uniformly in the width direction of the positive electrode plate hoop material 11.
- FIG. 9C is a cross-sectional view of a portion where the groove forming ridges 30a and 31b are formed in the fixed and movable groove processing rollers 30 and 31.
- the groove processing ridges 30a and 31b can form the groove portion 10 having the sectional shape shown in FIG. 5, that is, an arc shape having a tip angle ⁇ of 120 ° and a tip curvature R of 30 ⁇ m.
- the cross-sectional shape is as follows. By setting the tip angle ⁇ to 120 ° in this way, there is no possibility that the ceramic layer formed on the surface of the iron core will be damaged, and the curvature R of the tips of the grooving ridges 30a, 31a is set. By setting the thickness to 30 ⁇ m, there is no possibility that cracks are generated in the positive electrode active material layer 13 when the groove processing protrusions 30 a and 31 a are pressed against the positive electrode active material layer 13 to form the groove 10.
- the grooving ridges 30a and 31b are coated by spraying chromium oxide on the entire surface of the iron roller base, and irradiating a laser on the ceramic layer formed thereby. Since it is formed by partially melting so as to form a pattern, it can be formed in the above shape with extremely high accuracy. Further, by adopting such a forming means, it is possible to accurately form the tip corners of the grooving ridges 30a and 31a in an arc shape having a curvature R of 30 ⁇ m as described above. The rising roots of the protrusions 30a, 31a are also inevitably formed in an arc shape, in other words, a shape that is a sharp corner is not formed. This also eliminates the risk of damage to the ceramic layer on the surfaces of the fixed and movable grooving rollers 30,31.
- FIG. 10 is a side view of the groove processing mechanism portion 28.
- the auxiliary drive roller 32 is made of rubber made of silicone having a hardness of about 80 degrees, and is provided so as to be movable by a predetermined distance in the horizontal direction in contact with and away from the groove processing roller 30.
- the auxiliary driving roller 32 is a free roller to which no driving force is applied.
- the roller shaft 32 a itself is pressurized by the auxiliary conveying force applying air cylinder 58, and the groove portion 10 is formed in the double-side coating unit 14.
- the positive electrode plate hoop material 11 is pressed against the groove processing roller 30.
- the load applied from the auxiliary driving roller 32 to the positive electrode plate hoop material 11 is adjusted so as to be always constant by the air pressure of the auxiliary conveying force applying air cylinder 58.
- the air pressure of the auxiliary conveying force applying air cylinder 58 is automatically adjusted so that the load that does not form the groove portion 10 is always applied to the auxiliary driving roller 32 by the groove processing protrusion 30a of the roller 30.
- the positive electrode plate hoop material 11 passes between the fixed and movable grooving rollers 30 and 31 in such a manner that the positive electrode active material layer 13 of the single-side coated portion 17 faces the grooving roller 30. It is set to be. Thereby, when the single-sided coating part 17 of the positive electrode plate hoop material 11 passes through the gap between the groove processing rollers 30, 31, the stopper 49 prevents the groove processing roller 31 from pressing the single-sided coating part 17. it can.
- the positive electrode plate hoop material 11 is arranged to be transferred in such a manner that the positive electrode active material layer 13 of the single-side coated part 17 faces the groove processing roller 31, the positive electrode active material layer of the single-side coated part 17
- a means for pushing the groove processing roller 31 up to a position away from the positive electrode active material layer 13 of the single-side coated portion 17 is required instead of the stopper 49. It becomes difficult to move smoothly.
- Dust collecting nozzles 59 and 60 for sucking and cleaning the active material adhering to the roller surface are disposed in the vicinity of the roller surfaces of the fixed and movable groove processing rollers 30 and 31.
- the clearance between the tip of the dust collection nozzles 59 and 60 and the roller surface is set to about 2 mm. Further, at the position between the gap between the groove processing rollers 30 and 31 and the auxiliary drive roller 32, the active material attached to the positive electrode plate hoop material 11 immediately after the groove portion 10 is formed by the groove processing rollers 30 and 31.
- a dust collection nozzle 61 for sucking and cleaning the substance is disposed, and also at each position on both sides of the positive electrode plate hoop material 11 between the auxiliary driving roller 32 and the take-out side winding guide roller 33.
- a pair of dust collection nozzles 62 are respectively disposed. These dust collecting nozzles 59 to 62 are set to a suction wind speed of 10 m or more per second.
- a positive electrode plate hoop material 11 having a double-sided coating part 14, a single-sided coating part 17 and a core material exposed part 18 is formed by an intermittent coating method. Is passed through the gap between the groove processing mechanism section 28 and the movable groove processing rollers 30, 31, thereby forming the groove sections 10 on both surfaces of the double-side coating section 14 of the positive electrode plate hoop material 11.
- a precision pressure reducing valve 54 that adjusts the air pressure supplied to the pair of air cylinders 50, 51 via the air pipes 52, 53 of the same length is used as the air pressure of the pair of air cylinders 50, 51.
- the grooving roller 31 always has a constant pressure and the double-sided coating part 14 Pressed against. That is, the fixed and movable grooving rollers 30 and 31 convey the positive electrode plate hoop material 11 while sandwiching the double-sided coating part 14 at a predetermined pressure by a constant pressure method, thereby forming groove parts on both sides of the double-sided coating part 14. 10 is formed.
- the groove forming ridges 30a and 31a of the groove processing rollers 30 and 31 have a predetermined depth of 8 ⁇ m which is always set with respect to the positive electrode active material layer 13 regardless of variations in the thickness of the double-side coated portion 14.
- the groove portion 10 having D is reliably formed.
- the groove processing rollers 30 and 31 are rotatably supported by the ball bearings 47 and 48 in a form in which no tolerance gap exists, and in addition to preventing rattling, the positive electrode plate
- the hoop material 11 is transferred in a state of being wound around the substantially half circumferential surface of the groove processing roller 30, the occurrence of rattling is suppressed even when the tension acting on the positive electrode plate hoop material 11 is small.
- the groove processing roller 31 is constantly subjected to the set pressure by the air cylinders 50 and 51, and the double-side coated portion 14 of the positive electrode plate hoop material 11 has a depth D of about 8 ⁇ m ⁇ 1 ⁇ m with extremely high accuracy.
- the groove portion 10 can be formed, and when the single-side coated portion 17 passes between the groove processing rollers 30 and 31, the active material due to rattling is removed from the positive electrode active material layer 13 of the single-side coated portion 17. Does not occur.
- the grooving roller 31 needs to be smoothly moved up and down in response to variations in the thickness of the double-side coated portion 14 of the positive electrode plate hoop material 11. In this case, if the gap between the groove processing roller 31 and the groove processing roller 30 at the upper limit position is too large, reproducibility is lost, and therefore the vertical movement range of the groove processing roller 31 needs to be set in consideration thereof. .
- each groove part 10 having a depth D of 8 ⁇ m is formed in each positive electrode active material layer 13 of the double-side coated part 14 having a thickness of about 200 ⁇ m
- the gap between the fixed and movable groove processing rollers 30 and 31 is In addition, it is necessary to allow for the clearance for the ball bearings 47 and 48 to rotate and the buckling of the positive electrode plate hoop material 11, so that the groove forming protrusions 30 a and 31 a are bited into the positive electrode active material layer 13 beyond the necessary depth. Must be set to Therefore, in practice, a gap between the groove processing rollers 30 and 31 is set.
- the positive electrode plate hoop material 11 is regulated by the meandering prevention roller mechanism 27 shown in FIG. 7 so as to surely pass through the gap between the central portions of the fixed and movable groove processing rollers 30 and 31, and the groove processing. Since the roller 31 is configured to apply a uniform pressing force in the width direction of the positive electrode plate hoop material 11 by the gears 44 of the same weight provided on both sides, the roller 31 is applied to the double-side coated portion 14 of the positive electrode plate hoop material 11. The groove portion 10 having a uniform depth D in the width direction is formed.
- the grooving roller 31 comes into contact with the pair of stoppers 49 on both sides to form the grooving roller. As shown in FIG. 10, the approach to 30 is prevented and the state is separated from the positive electrode plate hoop material 11. Therefore, since the positive electrode active material layer 13 of the single-side coated part 17 passes through without being pressed by the groove processing roller 30, the groove part 10 is not formed. At this time, the minimum gap between the groove processing rollers 30 and 31 is set as a gap where the ball bearings 47 and 48 rotate so as not to form the groove 10 in the positive electrode active material layer 13 of the single-side coated portion 17.
- the gap between the fixed and movable grooving rollers 30 and 31 when the double-side coating unit 14 passes is set by the air pressure of the air cylinders 50 and 51, but the single-side coating unit
- the grooving roller 31 moves downward and comes into contact with the stopper 49, so that the grooving roller 31 stops in a state where there is a gap. Since the gap is larger than the thickness of 17, the groove 10 is not formed in the positive electrode active material layer 13 of the single-side coated portion 17 by the groove processing roller 30.
- the application of the conveying force to the positive electrode plate hoop material 11 by the clamping to the positive electrode plate hoop material 11 by the fixed and movable groove processing rollers 30 and 31 is released.
- a conveying force is applied to the positive electrode plate hoop material 11 by sandwiching between the groove processing roller 30 and the auxiliary driving roller 32, and at this time, the auxiliary driving roller 32 is formed on the double-side coating unit 14.
- the positive electrode plate hoop material 11 between the supply side and the extraction side dancer roller mechanisms 24 and 37 is always held at a constant tension.
- the positive electrode plate hoop material 11 that is adjusted to a constant tension is simply provided with a small conveying force by the small pressure of the auxiliary driving roller (conveying force applying means) 32. Can be reliably conveyed at a predetermined transfer speed while maintaining a constant tension.
- the single-side coated portion 17 and the core material exposed portion 18 of the positive electrode plate hoop material 11 reach the gap between the fixed and movable groove processing rollers 30 and 31, and are applied to the positive electrode plate hoop material 11 by the groove processing rollers 30 and 31. Even if the application of the conveying force to the positive electrode plate hoop material 11 by the sandwiching is released, the positive electrode plate hoop material 11 is not unexpectedly transferred at high speed due to the tension acting on the positive electrode plate hoop material 11. Thereby, the positive electrode plate hoop material 11 is always transported between the groove processing rollers 30 and 31 in a state without slack, and does not extend due to application of strong tension.
- the auxiliary driving roller 32 always applies the double-sided coating during a period in which the gap between the groove processing rollers 30 and 31 passes through the core material exposed portion 18 and the single-side coated portion 17 of the positive electrode plate hoop material 11. Abuts on the work part 14. At this time, the auxiliary conveying force applying air cylinder 58 applies a small pressing force to the auxiliary driving roller 32 so that the auxiliary driving roller 32 does not crush the groove portion 10 formed in the double-side coated portion 14. Air pressure is adjusted automatically.
- the positive electrode plate hoop material 11 is in a range covering almost a half circumference on the outer circumferential surface of the groove processing roller 30 by the supply side winding guide roller 29 and the takeout side winding guide roller 33. It is transported in a state of being wound around. As a result, the positive electrode plate hoop material 11 is effectively prevented from flapping during conveyance, and therefore there is no risk of the active material falling off from the positive electrode active material layer 13 due to the occurrence of flapping. In contrast to the conventional transfer speed of only about 5 m / sec, this embodiment enables high-speed and stable transfer at a transfer speed of about 30 to 50 m / sec. 2 can be produced with high productivity.
- the groove processing rollers 30, 31 are peeled off from the positive electrode active material layer 13. Small pieces of active material adhering to the peripheral surface of the active material are sucked into the dust collecting nozzles 59 and 60 to be excluded, and small pieces of active material adhering to the positive electrode plate hoop material 11 after the processing of the groove portion 10 are also removed. Inhaled by 62 and excluded. Therefore, the groove 10 can be formed in the positive electrode plate hoop material 11 with good reproducibility.
- the electrode group 1 has a configuration in which the positive electrode plate 2 and the negative electrode plate 3 are wound via the separator 4, but the core material exposed portion 18 of the positive electrode plate 2 is the uppermost layer or The same effect can be obtained also for the electrode group 1 produced by folding the positive electrode plate 2 and the negative electrode plate 3 in a zigzag manner with the separator 4 interposed therebetween.
- a lithium nickel composite oxide represented by the composition formula LiNi 8 Co 0.1 A1 0.05 O 2 was used as the positive electrode active material.
- a predetermined ratio of Co and Al sulfuric acid was added to the NiSO 4 aqueous solution to prepare a saturated aqueous solution. While stirring this saturated aqueous solution, an alkaline solution in which sodium hydroxide is dissolved is slowly dropped and neutralized to neutralize the ternary nickel hydroxide Ni 0.8 Co 0.15 Al 0.05 (OH) 2 . Produced by precipitation. The precipitate was filtered, washed with water, and dried at 80 ° C. The obtained nickel hydroxide had an average particle size of about 10 ⁇ m.
- lithium hydroxide hydrate was added so that the ratio of the sum of the number of Ni, Co, and Al atoms to the number of Li atoms was 1: 1.03, and heat treatment was performed in an oxygen atmosphere at 800 ° C. for 10 hours. by performing, to obtain a LiNi 0.8 Co 0.15 Al 0.05 O 2 of interest.
- the obtained lithium nickel composite oxide was confirmed by powder X-ray diffraction to have a single-phase hexagonal phase structure, and Co and Al were dissolved. And it was set as the positive electrode active material powder through the process of grinding
- PVdF polyvinylidene fluoride
- NMP N-methylpyrrolidone
- the grooving ridges 30 a and 31 a having a tip angle ⁇ of 120 ° and a height H of 25 ⁇ m on the ceramic outer surface of the roller body having a roller outer diameter of 100 mm.
- the positive electrode plate hoop material 11 was passed between the groove processing rollers 30 and 31 to form the groove portions 10 on both surfaces of the double-side coated portion 14 of the positive electrode plate hoop material 11.
- the groove processing mechanism section 28 engages the gears 43 and 44 fixed to the roller shafts 30b and 31b of the groove processing rollers 30 and 31, and rotates the groove processing roller 31 with a servo motor, thereby the groove processing roller 30. , 31 are rotated at the same rotational speed.
- a stopper 49 is interposed between the grooving rollers 30 and 31 to prevent them from approaching 100 ⁇ m or less. It is confirmed whether or not the gap between the grooving rollers 30 and 31 is correctly secured, and the air pressure of the air cylinders 50 and 51 that pressurize the grooving roller 31 is 30 kgf per 1 cm in the width direction of the positive electrode plate hoop material 11. It adjusted so that the load of might be applied. This air pressure was adjusted by a precision pressure reducing valve 54.
- the auxiliary driving roller 32 is made of silicone having a hardness of about 80 degrees as a surface material, and the air pressure of the auxiliary conveying force applying air cylinder 58 that pressurizes the auxiliary driving roller 32 is applied to the positive electrode plate hoop material 11.
- Adjustment was made so that a load of about 2 kgf was applied per 1 cm in the width direction.
- the positive electrode plate hoop material 11 was transported at a predetermined transfer speed in a state where a tension of several kg was applied.
- the groove part 10 was formed in both surfaces of the double-sided coating part 14 of the positive electrode plate hoop material 11 using the above structures, and the depth D of the groove part 10 of the positive electrode active material layer 13 was measured with the contour measuring device, an average of 8 It was confirmed that no groove 10 was formed in the positive electrode active material layer 13 of the single-side coated portion 17.
- production of the crack of the positive electrode active material layer 13 was confirmed using the laser microscope, the crack was not seen at all.
- the increase in the thickness of the positive electrode plate 2 was about 0.5 ⁇ m, and the longitudinal extension per cell was about 0.1%.
- the negative electrode active material is 100 parts by weight of artificial graphite, and the binder is a styrene-butadiene copolymer rubber particle dispersion (solid content: 40% by weight) with respect to 100 parts by weight of the active material.
- 1 part by weight in terms of solid content of the adhesive), 1 part by weight of carboxymethyl cellulose as a thickener with respect to 100 parts by weight of the active material, and an appropriate amount of water are stirred in a kneader to produce a negative electrode mixture paste did.
- This negative electrode mixture paste is applied and dried on a current collecting core made of a copper foil having a thickness of 10 ⁇ m, roll-pressed so that the total thickness is about 200 ⁇ m, and then a slitter machine with a nominal capacity of 2550 mAh and a diameter of 18 mm.
- a negative electrode plate hoop material was prepared by cutting into a width of about 60 mm, which is the width of the negative electrode plate 3 of the prismatic lithium battery having a height of 65 mm.
- the bipolar plate hoop material was superposed on the porous insulator 4 made of a polyethylene microporous film having a thickness of about 30 ⁇ m in a dry air room.
- the electrode group 1 was constituted by winding in a state.
- the positive electrode plate hoop material 11 cuts the core material exposed portion 18 in the middle between the double-side coated portion 14 and the single-side coated portion 17, but the grooving rollers 30 and 31 are disposed on the single-side coated portion. 17 so that the groove portion 10 is not formed in the positive electrode active material layer 13, the core material exposed portion 18 and the single-side coated portion 17 after cutting are not deformed in a curved shape. There was no decrease in operation.
- the positive electrode current collecting lead 20 was attached before winding in the state of the positive electrode plate hoop material 11 using a welded portion provided in the winding machine.
- the grooving roller 30 is replaced with a flat roller having no grooving protrusions, the gap between the grooving rollers 30 and 31 is set to 100 ⁇ m, and a load of 31 kg per 1 cm width of the positive electrode plate 2 is set.
- the groove 10 having a depth D of about 8 ⁇ m was formed only in the positive electrode active material layer 13 on one side of the double-side coated part 14 to produce a positive electrode plate (Comparative Example 1).
- a positive electrode (Comparative Example 2) in which the groove 10 was not formed on both the positive electrode active material layers 13 on both sides of the double-side coated portion 14 was produced.
- the electrolyte solution was injected to verify the liquid injection property.
- the pouring property of the electrolytic solution When evaluating the pouring property of the electrolytic solution, a pouring method in which about 5 g of the electrolytic solution was supplied to the battery case 7 and impregnated by drawing a vacuum was adopted.
- the electrolytic solution may be supplied into the battery case 7 in several times.
- an electrolytic solution is simultaneously supplied to the battery case 7 of a plurality of cells, vacuumed at a vacuum degree of ⁇ 85 kpa, degassed, and then released to the atmosphere so that the electrolytic solution is discharged into the electrode group 1.
- a method of forcibly infiltrating the inside and terminating the electrolyte injection was adopted. The completion of the injection is determined by looking into the battery case 7 from directly above and the electrolyte solution completely disappearing from the top of the electrode group 1. Let liquid time be data that can be used for production. The verification results are shown in Table 1.
- Example 1 a method of injecting the electrolyte into the electrode group 1 through a process of injecting a predetermined amount of electrolyte and releasing it to the atmosphere after evacuation was adopted.
- the injection time was shortened, the evaporation of the electrolytic solution in the injection can be reduced, and the injection time is greatly shortened by improving the injection property.
- the amount of liquid evaporation can be minimized, and the opening of the battery case 7 can be sealed with a sealing member. This indicates that it has become possible to significantly reduce the loss of the electrolytic solution as the pouring and impregnating properties of the electrolytic solution are improved.
- the positive electrode plate for a battery of the present invention and the electrode group formed using the positive electrode are excellent in impregnation with an electrolytic solution and excellent in productivity and reliability.
- the water-based secondary battery is useful as a drive power source for portable electronic devices or communication devices.
- Electrode group 2 Positive electrode plate 3 Negative electrode plate 4 Separator 5 Insulating plate 6 Terminal 7 Battery case 8 Insulating gasket 9 Sealing plate 10 Groove portion 11 Positive electrode plate hoop material 12 Current collecting core material 13 Positive electrode active material layer 14 Double-side coated portion 15 Non Water-based secondary battery 16 Current collecting lead 17 Single-side coated part 18 Core exposed part 19 Electrode plate part 20 Current collecting lead 21 Insulating tape 22 Uncoiler 23 Feeding side guide roller 24 Supply side dancer roller mechanism 24a Supporting roller 24b Dancing roller 27 Meandering prevention roller mechanism 27a Roller 28 Groove processing mechanism 29 Supply side winding guide roller 30 Groove processing roller 31 Groove processing roller 30a, 31a Groove protrusion 30b, 31b Roller shaft 32 Auxiliary drive roller 32a Roller shaft 33 Unloading Side winding guide Roller 34 Direction change guide roller 37 Take-out dancer roller mechanism 37a Support roller 37b Dancing roller 38 Secondary drive roller 39 Conveyance roller 40 Take-up adjustment dancer roller mechanism 40a Support roller 40b Dancing roller 41 Take-up guide
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Abstract
Description
2 正極板
3 負極板
4 セパレータ
5 絶縁板
6 端子
7 電池ケース
8 絶縁ガスケット
9 封口板
10 溝部
11 正極板フープ材
12 集電用芯材
13 正極活物質層
14 両面塗工部
15 非水系二次電池
16 集電リード
17 片面塗工部
18 芯材露出部
19 極板構成部
20 集電リード
21 絶縁テープ
22 アンコイラー
23 繰り出し側ガイドローラ
24 供給側ダンサーローラ機構
24a 支持ローラ
24b ダンシングローラ
27 蛇行防止ローラ機構
27a ローラ
28 溝部加工機構部
29 供給側巻付用ガイドローラ
30 溝加工ローラ
31 溝加工ローラ
30a,31a 溝加工用突条
30b,31b ローラ軸
32 補助駆動用ローラ
32a ローラ軸
33 取出側巻付用ガイドローラ
34 方向変換用ガイドローラ
37 取出側ダンサーローラ機構
37a 支持ローラ
37b ダンシングローラ
38 二次駆動ローラ
39 搬送補助ローラ
40 巻き取り調整用ダンサーローラ機構
40a 支持ローラ
40b ダンシングローラ
41 巻き取り側ガイドローラ
42 コイラー
43,44 ギヤ
45 封栓口
46 封栓
47 ボールベアリング
47a ボール
47b ベアリングホルダ
48 ボールベアリング
48a ボール
48b ベアリングホルダ
49 ストッパ
50,51 エアーシリンダ
52,53 エアー配管
54 精密減圧弁
57 エアーポンプ
58 補助搬送力付与用エアーシリンダ
59,60,61,62 集塵ノズル
Claims (12)
- 集電用芯材の表面に活物質層が形成された非水系電池用正極板であって、
前記正極板は、
前記集電用芯材の両面に活物質層が形成された両面塗工部と、
前記集電用芯材の端部であって、前記活物質層が形成されていない芯材露出部と、
前記両面塗工部と前記芯材露出部との間であって、前記集電用芯材の片面にのみ活物質層が形成された片面塗工部と
を有し、
前記両面塗工部の両面に前記正極板の長手方向に対して傾斜した複数の溝部が形成され、かつ、前記片面塗工部には溝部が形成されておらず、
前記芯材露出部には、正極の集電リードが接続されており、
前記正極板は、前記芯材露出部を巻き終端として巻回される、または、前記芯材露出部を最表層としてつづら折りに折りたたまれることを特徴とする非水系電池用正極板。 - 前記両面塗工部の両面に形成された溝部は、位相が対称になっていることを特徴とする請求項1に記載の非水系電池用正極板。
- 前記両面塗工部の両面に形成された溝部の深さは、4μm~20μmの範囲にあることを特徴とする請求項1に記載の非水系電池用正極板。
- 前記両面塗工部の両面に形成された溝部は、前記正極板の長手方向に沿って、100μm~200μmのピッチで形成されていることを特徴とする請求項1に記載の非水系電池用正極板。
- 前記両面塗工部の両面に形成された溝部は、前記正極板の幅方向に対して、一端面から他端面に貫通して形成されていることを特徴とする請求項1に記載の非水系電池用正極板。
- 前記両面塗工部の両面に形成された溝部は、前記正極板の長手方向に対して、互いに異なる方向に45°の角度に傾斜して形成され、且つ、互いに直角に立体交差していることを特徴とする請求項1に記載の非水系電池用正極板。
- 前記集電リードと前記片面塗工部における前記活物質層とは、前記集電用芯材に対して互いに同じ側に位置していることを特徴とする請求項1に記載の非水系電池用正極板。
- 正極板および負極板がセパレータを介して配置されてなる非水系電池用電極群であって、
前記正極板は、請求項1に記載の前記正極板であり、
前記負極板は、負極活物質層が負極の集電用芯材の両面に形成されて構成されており、
前記正極の前記片面塗工部は、前記電極群の最外周または前記電極群の最表層に位置していることを特徴とする非水系電池用電極群。 - 前記正極板の前記片面塗工部において前記活物質層が形成されていない集電用芯材の面は、前記電極群の最外周面または前記電極群の最表面を構成していることを特徴とする請求項8に記載の非水系電池用電極群。
- 請求項1に記載の前記正極板を用意する工程と、
負極活物質層が負極の集電用芯材の両面に形成された負極板を用意する工程と、
前記正極板の前記芯材露出部を巻き終端としてセパレータを介して前記正極板と前記負極板とを巻回する、又は、前記正極板の前記芯材露出部を最表層としてセパレータを介して前記正極板と前記負極板とをつづら折りに折りたたむ工程とを備えていることを特徴とする非水系電池用電極群の製造方法。 - 電池ケース内に、請求項8に記載の前記電極群が収容されるとともに、所定量の非水電解液が注液され、かつ、前記電池ケースの開口部が密閉状態に封口されていることを特徴とする角形非水系二次電池。
- 請求項11に記載の角形非水系二次電池の製造方法であって、
請求項1に記載の前記正極板を用意する工程と、
負極活物質層が負極の集電用芯材の両面に形成された負極板を用意する工程と、
前記正極板の前記芯材露出部を巻き終端としてセパレータを介して前記正極板と前記負極板とを巻回する、又は、前記正極板の前記芯材露出部を最表層としてセパレータを介して前記正極板と前記負極板とをつづら折りに折りたたむことにより、前記電極群を作製する工程と、
前記電池ケース内に前記電極群および前記非水電解液を収容して、前記電池ケースを封口する工程とを備えていることを特徴とする角形非水系二次電池の製造方法。
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WO2009013889A1 (ja) * | 2007-07-20 | 2009-01-29 | Panasonic Corporation | 電池用電極板、電池用極板群、リチウム二次電池、電池用電極板の製造方法、及び電池用電極板の製造装置 |
WO2009013890A1 (ja) * | 2007-07-20 | 2009-01-29 | Panasonic Corporation | 電池用電極板、電池用極板群、リチウム二次電池、及び電池用電極板の製造方法 |
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- 2009-11-16 US US12/922,372 patent/US20110008662A1/en not_active Abandoned
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JP2001023612A (ja) * | 1999-07-09 | 2001-01-26 | Matsushita Electric Ind Co Ltd | 非水電解液二次電池 |
JP2004006275A (ja) * | 2002-04-12 | 2004-01-08 | Toshiba Corp | 非水電解液二次電池 |
JP2005285607A (ja) * | 2004-03-30 | 2005-10-13 | Matsushita Electric Ind Co Ltd | 非水系二次電池およびその製造方法 |
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JP2006107853A (ja) * | 2004-10-04 | 2006-04-20 | Sony Corp | 非水電解質二次電池及びその製造方法 |
WO2009011123A1 (ja) * | 2007-07-17 | 2009-01-22 | Panasonic Corporation | 二次電池および二次電池の製造方法 |
WO2009013889A1 (ja) * | 2007-07-20 | 2009-01-29 | Panasonic Corporation | 電池用電極板、電池用極板群、リチウム二次電池、電池用電極板の製造方法、及び電池用電極板の製造装置 |
WO2009013890A1 (ja) * | 2007-07-20 | 2009-01-29 | Panasonic Corporation | 電池用電極板、電池用極板群、リチウム二次電池、及び電池用電極板の製造方法 |
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JP4527189B1 (ja) | 2010-08-18 |
KR20100112646A (ko) | 2010-10-19 |
US20110008662A1 (en) | 2011-01-13 |
JP2010186737A (ja) | 2010-08-26 |
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