WO2013137385A1 - Electrode, method for producing same, and device for producing same - Google Patents

Electrode, method for producing same, and device for producing same Download PDF

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Publication number
WO2013137385A1
WO2013137385A1 PCT/JP2013/057177 JP2013057177W WO2013137385A1 WO 2013137385 A1 WO2013137385 A1 WO 2013137385A1 JP 2013057177 W JP2013057177 W JP 2013057177W WO 2013137385 A1 WO2013137385 A1 WO 2013137385A1
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WO
WIPO (PCT)
Prior art keywords
active material
electrode
material layer
thin
region
Prior art date
Application number
PCT/JP2013/057177
Other languages
French (fr)
Japanese (ja)
Inventor
重男 木村
平野　晋一
Original Assignee
日産自動車株式会社
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Filing date
Publication date
Application filed by 日産自動車株式会社 filed Critical 日産自動車株式会社
Publication of WO2013137385A1 publication Critical patent/WO2013137385A1/en

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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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • 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
    • H01M4/0402—Methods of deposition of the material
    • H01M4/0404—Methods of deposition of the material by coating on electrode collectors
    • 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
    • H01M4/0402—Methods of deposition of the material
    • H01M4/0409—Methods of deposition of the material by a doctor blade method, slip-casting or roller coating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/595—Tapes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to an electrode used for, for example, a lithium ion battery, a manufacturing method thereof, and a manufacturing apparatus.
  • JP2006-175415A discloses a technique for covering a terminal of a positive electrode and sticking a tape member functioning as a spacer in order to prevent an internal short circuit between a positive electrode and a negative electrode of a lithium ion battery.
  • the active material layer is not formed but the electrode surface is exposed and the region extending in the width direction is formed at regular intervals.
  • An electrode terminal is joined to the exposed electrode surface by ultrasonic welding or the like, and the tape member extends in the width direction of the belt-like electrode across the electrode terminal surface, the exposed electrode surface and the region of the edge portion of the active material layer. Is pasted.
  • an uncoated region where no active material layer is applied is formed at one or both ends in the width direction, and the uncoated region is used as a tab for connecting electrode terminals.
  • a tape member functioning as a spacer is disposed by pasting or the like across the tab and the edge portion of the active material layer.
  • An object of the present invention is to provide an electrode suitable for performing an operation of arranging a tape member that functions as a spacer in succession to the application of an active material layer, and a method and an apparatus for manufacturing the electrode.
  • the electrode manufactured by the manufacturing apparatus has an uncoated region in which the active material extending in the longitudinal direction is not applied to at least one end in the width direction of the strip-shaped electrode raw material, and the active material is continuous in the longitudinal direction in the remaining width direction. And the active material layer applied to the surface.
  • a spacer member made of an insulating material is disposed in the longitudinal direction on the electrode so as to straddle the boundary portion between the uncoated region and the active material layer and cover a part of each.
  • the manufacturing apparatus applies the active material to the electrode material so that the thickness of the active material layer in the region where the spacer member is disposed is thin with a step with respect to the thickness of the active material layer in the other region.
  • a coating section is provided. Further, the manufacturing apparatus includes a spacer arrangement portion that arranges a spacer so as to cover at least a part of the thin part of the applied active material layer and a part of the uncoated region.
  • FIG. 1 is a schematic configuration diagram illustrating a first example of an electrode manufacturing apparatus according to a first embodiment of the present invention.
  • FIG. 2 is a perspective view of the die coater.
  • FIG. 3 is a perspective view of a shim used in the die coater.
  • FIG. 4 is a front view showing a slit of the die coater.
  • FIG. 5 is a cross-sectional view of an electrode fabric provided with an active material layer that has been applied and dried.
  • FIG. 6 is a front view showing a slit of a die coater showing a specific example of a shim shape.
  • FIG. 7 is a perspective view showing another specific example of a shim shape.
  • FIG. 8 is a front view showing an example of a slit of the die coater.
  • FIG. 1 is a schematic configuration diagram illustrating a first example of an electrode manufacturing apparatus according to a first embodiment of the present invention.
  • FIG. 2 is a perspective view of the die coater.
  • FIG. 9 is a front view showing the sticking roller.
  • FIG. 10 is a cross-sectional view of the original electrode fabric in a state where a protective tape is applied.
  • FIG. 11 is a perspective view showing a winding state of the strip electrode.
  • FIG. 12 is a schematic configuration diagram illustrating an electrode manufacturing apparatus according to a second example of the first embodiment.
  • FIG. 13 is a schematic block diagram which shows the manufacturing apparatus of the electrode of 2nd Embodiment of this invention.
  • FIG. 14 is a front view showing a slit shape of a die coater for applying an insulating material.
  • FIG. 15 is a cross-sectional view of an electrode material having a coated active material layer.
  • FIG. 16 is a cross-sectional view of an electrode raw fabric coated with an active material layer and a protective layer.
  • FIG. 1 is a schematic configuration diagram illustrating a first example of an electrode manufacturing apparatus according to the first embodiment.
  • an electrode manufacturing apparatus includes an electrode raw fabric 1 between an unwinding portion 2 and a winding portion 10 of an electrode raw fabric 1 (electrode band, electrode sheet, or electrode foil) made of metal foil.
  • Two coating parts 3 and 5 which apply an active material on both sides, and two drying parts 4 and 6 which dry the applied active material layer 12 on each side of electrode raw fabric 1 are provided.
  • the electrode manufacturing apparatus also includes an affixing unit 7 that affixes protective tape 13 as a spacer on both sides of the active material layer 12 and a press unit 8 that roll-presses the active material layer 12.
  • the slit part 9 which divides the obtained strip electrode into two strip electrodes is added.
  • two coating parts 3 and 5 and two drying parts 4 and 6 are arranged so that the active material layer 12 is formed on both surfaces of the electrode raw fabric 1.
  • the unwinding part 2 is a part to which the electrode raw material 1 made of a metal foil wound in a reel shape is attached.
  • the unwinding electrode raw material 1 for positive electrode or negative electrode is unwound and applied to the coating part 3 (front surface coating part). ), Drying unit 4 (front surface drying unit), back surface coating unit 5, and back surface drying unit 6.
  • the coating unit 3 applies an active material to the unrolled electrode raw material 1 with a die coater to form an active material layer 12 on the surface of the electrode raw material 1.
  • a region where the active material layer 12 is not applied is provided as an uncoated region 11 in the longitudinal direction of the electrode original fabric 1.
  • the uncoated region 11 is used as an electrode tab. For this reason, the active material layer 12 is formed in the area
  • the applied active material layer 12 is formed in a thick portion 12A having a normal film thickness in the central region. However, in a predetermined width from both ends in the width direction of the electrode fabric 1, there are thin portions 12B having a thickness smaller than the thickness of the thick portion 12A along the longitudinal direction.
  • the drying unit 4 back surface drying unit 6) volatilizes and drys the diluted solvent contained in the applied active material layer 12.
  • the pasting part 7 covers all or part of the thin part 12B at both ends in the width direction of the active material layer 12 that has been applied and dried, and covers a part of the uncoated region 11 that continues to the outside in the width direction of the thin part 12B.
  • the protective tape 13 that functions as a spacer is pasted.
  • the pressing unit 8 increases the packing density of the active material layer 12 and makes it uniform by passing the electrode raw material 1 in which the active material layer 12 is formed and the protective tape 13 is attached to both end regions between the rolling rolls. Complete the strip electrode.
  • the coating unit 3 includes a backup roller 21 around which the electrode fabric 1 is wound, and a die coater 20 that applies a coating solution to the electrode fabric 1 that passes over the backup roller 21.
  • the width direction of the electrode raw fabric 1 is referred to as the “width direction” of the coating portion 3. Therefore, the direction substantially parallel to the axis of the backup roller 21 around which the electrode fabric 1 is wound is the width direction.
  • the coating unit 3 includes one or a plurality of guide rollers 22 in addition to the backup roller 21, and the electrode fabric 1 is wound with tension. Due to the rotation of the rollers 22, the electrode raw material 1 wound up in a roll shape is continuously fed out to the coating unit 3 at a predetermined speed, and is conveyed to the drying unit 4.
  • the die coater 20 causes a coating liquid supplied from a coating liquid tank (not shown) to flow out from the slit 24 opened in the beak-shaped nozzle 23 and is applied to the electrode fabric 1 on the backup roller 21.
  • the slit 24 of the nozzle 23 of the die coater 20 is long in the width direction of the electrode original fabric 1, and the opening width of the slit 24 defines a prescribed width in which the coating liquid is applied to the electrode raw fabric 1.
  • the slit 24 of the nozzle 23 of the die coater 20 has a first shim 25 with a coating width set to be thin (for example, 0.3 mm) and a coating applied from the shim 25. It is formed by overlapping a second shim 26 having a narrow work width (for example, 4 mm narrow on both sides) and a slightly thick thickness (for example, 0.5 mm). That is, the first shim 25 and the second shim 26 are overlapped in this order on the nozzle forming surface of one die head 20A, and the nozzle forming surface of the other die head 20B is further overlapped and fixed by fastening bolts (not shown). As a result, as shown in FIG. 4, slits 24 are formed which are thin in both end regions in the width direction and thick in the central region excluding both end regions.
  • the width and thickness of the thin portion 12B and the thick portion 12A of the active material layer 12 can be arbitrarily changed. Thereby, it is not necessary to exchange a dedicated shim for each type of electrode, and the equipment cost can be reduced. Further, since the die coater 20 is formed by overlapping simple flat shims 25 and 26, the shape of the slit 24 can be formed with high accuracy, and the coating accuracy when the die coater 20 is used can be improved.
  • the electrode slurry is supplied to the die coater 20 and coating on the electrode raw material 1 is started.
  • the active material layer 12 applied to the electrode raw fabric 1 from the die coater 20 has a normal film thickness (thick portion 12A) in the central region.
  • step coating step coating
  • both ends in the width direction of the active material layer 12 have a thickness dimension smaller than a normal film thickness (thick portion 12A) applied to the central region, The thin portion 12B is formed.
  • the thickness of the thin portion 12B is, for example, 30 ⁇ m or more in a width dimension of 2 to 10 mm and 40 ⁇ m or less smaller than the normal film thickness applied to the central region.
  • the applied active material layer 12 is transported to the pasting unit 7 after being dried by the drying units 4 and 6.
  • the back surface coating unit 5 applies the same step coating to the other surface (back surface) of the electrode raw fabric 1 using the same coating die coater as the coating unit 3.
  • the back surface drying unit 6 dries the active material layer 12 on the back surface.
  • the electrode raw fabric 1 having the active material layer 12 formed on both sides includes the active material layer 12 coated with a step as shown in FIG. 5, and a thick portion 12A having a normal film thickness in the central region. And the thin portion 12B having a thickness smaller than the thickness of the central region is provided at both ends in the width direction.
  • the end faces of the first and second shims 25, 26 are provided as shown in FIG. It may be slopes 25A, 26A.
  • coated active material layer 12 may become an acute angle.
  • a heating device is disposed in the vicinity of the corners of the thick part 12A and the thin part 12B of the active material layer 12 immediately after being applied, and the corners are dried and cured by a drying furnace. It may be cured prior to.
  • the shim provided in the die coater 20 is not limited to the above-described configuration, and may be configured as shown in FIG.
  • the stepped shim 27 has a shape in which the first shim 25 and the second shim 26 described above are integrated, and a thick portion 27 ⁇ / b> A that protrudes from both ends, and an inner side from the thick portion 27 ⁇ / b> A. And a thin-walled portion 27 ⁇ / b> B extending integrally with each other.
  • the thick part 27A sets the coating width of the width dimension including both the thin parts 12B of the active material layer 12, and the thin part 27B sets the thin part 12B and the thick part 12A of the active material layer 12 To do.
  • the stepped shim 27 can be formed by forming the thin portion 27B by cutting the shim material without thermally deforming it.
  • the width and thickness of the thin wall portion 12B and the thick wall portion 12A can be arbitrarily changed by simply replacing the shim. And it is not necessary to exchange die head 20A, 20B for every kind of electrode, and equipment cost can be reduced.
  • the shape of the slit 24 of the die coater 20 may be formed by making the tip lip shape of one die head 20B into a stepped shape as shown in FIG. 8 without using a shim as described above.
  • the die head 20B can be formed into a stepped shape by machining such as grinding.
  • the affixing unit 7 continuously affixes the protective tape 13 that functions as a spacer.
  • the protective tape 13 covers at least a part of the thin part 12B at both ends in the width direction of the coated and dried active material layer 12 and also covers a part of the uncoated region 11 connected to the outer side in the width direction of the thin part 12B.
  • a total of four protective tapes 13 are affixed, one on each side of one side of the electrode fabric 1 and one on each side of the other side.
  • the protective tape 13 has a width dimension of, for example, about 10 mm, preferably 7 mm, and has a thickness dimension of, for example, 20 ⁇ m to 80 ⁇ m, preferably 30 ⁇ m.
  • the material of the protective tape 13 may be any material that has excellent insulating properties, such as polyimide, polyester, polyvinylidene fluoride, and the like.
  • the affixing portion 7 follows the displacement in the width direction of the electrode fabric 1 and follows the protective tape 13 to stably affix.
  • an EPC device edge position control, abbreviation for Edge Position Control), which is a registered trademark of Nireco
  • a barrel-shaped crown roll is used as the sticking roller 30.
  • the crown-shaped (barrel-shaped) sticking roll 30 always concentrates tension on the center of the roll 30 from its shape. Accordingly, the traveling of the protective tape 13 is stabilized, the positional deviation of the protective tape 13 can be prevented, and the protective tape 13 can be always stuck at the target position.
  • FIG. 10 shows a state in which the protective tape 13 is pasted at the pasting unit 7.
  • the thickness of the protective tape 13 is thin, for example, 30 ⁇ m, and is smaller than the dimension of the step between the thin portion 12B and the thick portion 12A of the active material layer 12.
  • the step size between the thick portion 12A and the thin portion 12B is 70 to 90 ⁇ m.
  • the protective tape 13 having a thickness of 30 ⁇ m is sufficiently accommodated within the step size. For this reason, the protective tape 13 is affixed, without the surface of the protective tape 13 rising from the surface of the active material layer 12 which comprises the thick part 12A.
  • the thick portion 12A is compressed by 40 ⁇ m by the downstream press portion 8 and the step size is reduced to 30 to 50 ⁇ m, for example, the active material layer whose surface of the protective tape 13 constitutes the thick portion 12A It is possible to prevent swelling from the 12 surfaces.
  • the dimension of the step is not large and the protective tape 13 and the thin portion 12B are pressed by the rolling roll by compressing the thick portion 12A by compression at the press portion 8.
  • the surface of the protective tape 13 and the surface of the thick portion 12A are formed on the same surface by thinning the thin portion 12B. Therefore, the surface of the protective tape 13 can be prevented from rising from the surface of the active material layer 12 constituting the thick portion 12A.
  • the electrode fabric 1 with the protective tape 13 attached is conveyed to the press unit 8 and passes between the rolling rolls of the press unit 8. Thereby, the packing density of the active material layer 12 is increased and uniformized, and the electrode raw fabric 1 becomes a strip electrode.
  • the strip electrode is divided at the central portion in the width direction.
  • the divided strip-shaped electrode is cut into a predetermined length in the next step, so that an electrode plate can be formed by itself.
  • the pair of left and right portions (or the left and right portions) of the strip electrode divided by the slit portion 9 is wound around the winding roller 31 of the winding portion 10.
  • FIG. 12 shows that in the electrode manufacturing apparatus of the second example, the affixing part 7 is arranged downstream of the pressing part 8.
  • Other configurations are the same as those in the first example.
  • the electrode material 1 coated with the active material layer 12 in the coating parts 3 and 5 and dried in the drying parts 4 and 6 passes between the rolling rolls of the press part 8 and forms the thick part 12A. 12 is compressed and the packing density is increased and uniformized.
  • the affixing unit 7 continuously affixes the protective tape 13 that functions as a spacer.
  • the protective tape 13 covers at least a part of the unpressed thin part 12B of the electrode raw fabric 1 including the pressed active material layer 12 and a part of the uncoated region 11 connected to the outer side in the width direction of the thin part 12B. . Since the thin-walled portion 12B to which the protective tape 13 is applied has not been compressed by the press portion 8, the size of the step with respect to the thick-walled portion 12A compressed by the press portion 8 is reduced. For this reason, the dimension of the level
  • the thickness of the protective tape 13 is 30 ⁇ m and the active material layer 12 of the thick portion 12A is compressed from 123 ⁇ m to 80 ⁇ m by the press portion 8, it is formed by the coating portions 3 and 5.
  • the thickness dimension of the thin part 12B is 50 ⁇ m or less, the surface of the protective tape 13 can be prevented from rising from the surface of the thick part 12A.
  • the uncoated regions 11 where the active material extending in the longitudinal direction is not applied are provided at both ends in the width direction of the strip-shaped electrode raw fabric 1.
  • the uncoated region 11 where the active material extending in the longitudinal direction is not applied may be provided at one end portion in the width direction of the strip-shaped electrode raw fabric 1.
  • the electrode raw fabric 1 may be formed so that the uncoated area
  • region 11 may be provided in the width direction center part.
  • the electrode extends in the longitudinal direction at least at one end in the width direction of the strip-shaped electrode raw fabric 1 and is not coated with an active material, and the remainder in the width direction (that is, other than the uncoated area 11) Active material layer 12 in which the active material is continuously applied in the longitudinal direction.
  • the protective tape 13 as a spacer member which consists of an insulating material which straddled the boundary part of the uncoated area
  • the coating parts 3 and 5 of a manufacturing apparatus implement a coating process, the thickness of the active material layer 12 of the area
  • the active material is applied to the electrode fabric 1 so that the thickness of the active material layer 12 in this region becomes thin with a level difference.
  • the affixing unit 7 of the manufacturing apparatus performs a spacer arrangement process as a spacer arrangement unit and covers at least a part of the thin part 12B of the applied active material layer 12 and a part of the uncoated region 11 to form a spacer. Arrange the members.
  • the thickness of the active material layer 12 in the region where the spacer member adjacent to the uncoated region 11 of the active material layer 12 is arranged is different from the thickness of the thin portion 12B with respect to the thickness of the active material layer 12 in other regions. Become. For this reason, even if the protective tape 13 as a spacer is affixed, the thickness of both ends in the width direction of the electrode can be made equal to or less than that of the central portion, so that both ends in the width direction do not rise, Can be continuously wound. As a result, the protective tape 13 can be attached in-line, and the electrode manufacturing process can be simplified.
  • the coating units 3 and 5 apply the electrode slurry containing the active material to the electrode raw fabric 1 by the die coater 20 having a slit.
  • the slit has an opening dimension thinner at both ends in the width direction of the slit than at the center. For this reason, the active material layer 12 provided with the thin part 12B and the thick part 12A in the electrode raw fabric 1 can be formed continuously.
  • the shape of the slit of the die coater 20 was configured to face the opening of the shim 27 sandwiched between the die heads 20A and 20B. Only by replacing the shim 27, the width and thickness of the thin portion 12B and the thick portion 12A can be arbitrarily changed. There is no need to replace the die heads 20A and 20B for each type of electrode, and the equipment cost can be reduced.
  • the shim is a first shim 25 that sets a boundary region with the uncoated region 11 of the thin portion 12B of the active material layer 12, and the upper surface of the thin portion 12B and other regions that overlap the first shim 25 And a second shim 26 for setting the width of the active material layer 12. For this reason, by changing the combination of the first and second shims 25 and 26, the width and thickness of the thin portion 12B and the thick portion 12A can be arbitrarily changed. Therefore, it is not necessary to replace a dedicated shim for each type of electrode, and the equipment cost can be reduced. Further, since the shim is formed by overlapping simple flat shims 25 and 26, the shape can be formed with high accuracy, and the coating accuracy when used in the die heads 20A and 20B can be improved.
  • the end surfaces of the first and second shims 25, 26 are formed by the slopes 25A, 26A.
  • the corners of the thick part 12A and the thin part 12B of the applied active material layer 12 may be acute.
  • a heating device is disposed in the vicinity of the corners of the thick part 12A and the thin part 12B of the active material layer 12 immediately after being applied, and the corners are dried by a drying furnace. It may be cured prior to curing.
  • the spacer arrangement portion 7 covers at least a part of the dried active material layer 12 or the thin part 12B of the dried and pressed active material layer 12 and a part of the uncoated region 11 to form a spacer.
  • the protective tape 13 as a member is affixed. For this reason, the protective tape 13 as a spacer member is continuously pasted in-line continuously to at least a part of the thin portion 12B of the active material layer 12 of the electrode fabric 1 being conveyed and a part of the uncoated region 11. be able to.
  • the spacer arrangement portion 7 includes a guide roller 30 that presses the protective tape 13 against at least a part of the thin portion 12B of the active material layer 12 and a part of the uncoated region 11, and the guide roller 30 is a crown. Provided with a shaped surface. For this reason, the tension of the protective tape 13 can always be concentrated on the central portion of the roll 30 by the crown shape, and the traveling of the protective tape 13 can be stabilized. Therefore, the position shift of the protective tape 13 as a spacer can be prevented, and the protective tape 13 can be adhered to the target position with high accuracy.
  • FIG. 13 to 16 show a second embodiment of an electrode to which the present invention is applied, a method for manufacturing the electrode, and a manufacturing apparatus.
  • FIG. 13 is a schematic configuration diagram of an electrode manufacturing apparatus.
  • coats the insulating material which functions as a spacer to the upper surface of the thin part of an active material layer is added to 1st Embodiment.
  • the same devices as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted or simplified.
  • the electrode manufacturing apparatus is insulated by providing the coating portions 3 ⁇ / b> A and 5 ⁇ / b> A adjacent to the downstream of the die coater 20 to which the active material is applied, instead of being provided with the attaching portion of the protective tape 13.
  • a die coater 28 for applying the material 14 is provided.
  • Other configurations are the same as those of the first embodiment.
  • each slit 28 ⁇ / b> B has a thin portion 12 ⁇ / b> B of the active material layer 12 applied to the electrode fabric 1 by the preceding die coater 20 and an uncoated region 11 that continues to the outside in the width direction of the thin portion 12 ⁇ / b> B.
  • An opening is formed in a width region facing a part of the substrate.
  • the insulating material 14 is quantitatively supplied to the die coater 28 with high accuracy by a dispenser (liquid quantitative discharge device) or the like, and the thin portion 12B of the active material layer 12 and a part of the outer region in the width direction of the thin portion 12B (FIG. 15). In addition, it is applied wet-on-wet to a specified thickness.
  • the insulating material 14 is polyimide, polyester, polyvinylidene fluoride, or the like, and may be a resin material mixed with a filler such as alumina or talc in order to increase the insulating effect. Since the insulating material 14 has a composition different from that of the electrode slurry made of the active material, it does not mix with the active material even when applied wet-on-wet, and the protective layer made of the active material layer 12 and the insulating material 14. It exists separately.
  • FIG. 16 shows a state where the active material layer 12 and the protective layer made of the insulating material 14 are applied.
  • the electrode fabric 1 coated with the active material layer 12 and the insulating material 14 is dried by the drying unit 4 and then protected by the back surface coating unit 5 in the same manner as the active material layer 12 and the insulating material 14. A layer is applied. Then, the electrode raw material 1 coated with the active material layer 12 and the insulating material 14 is dried by the back surface drying unit 6, density-adjusted by the press unit 8, separated by the slit unit 9, and separated by the winding unit 10. It is wound up.
  • the protective layer can be more easily formed by applying the protective layer made of the insulating material 14 serving as a spacer to the thin portion 12B formed by the step and a part of the uncoated region 11.
  • the second die coater 28 is an insulation serving as a spacer member so as to cover at least a part of the thin part 12B of the active material layer 12 applied to the electrode fabric 1 and a part of the uncoated region 11.
  • the material 14 is applied.
  • insulating material 14 used as a spacer member can be arranged continuously, and equipment can be formed more inexpensively.
  • the insulating material 14 has a composition different from that of the electrode slurry made of the active material, it does not mix with the active material even when applied wet-on-wet, and is separated into the active material layer 12 and the protective layer. Can exist.

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  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
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Abstract

The objective of the present invention is to provide: an electrode favorable for implementing the task of disposing a tape member functioning as a spacer following applying an active material layer; a method for producing same; and a device for producing same. The present invention is provided with an uncoated region at which the active material is not applied extending in the lengthwise direction to at least one end in the widthwise direction of a band-shaped electrode starting material; and a coated section at which the active material is applied to the electrode starting material in a manner so that the thickness of the active material layer, at which the tape member functioning as a spacer is disposed and that is the active material layer resulting from the active material being continuously applied in the lengthwise direction to the remainder in the widthwise direction, is thin, having a level difference with respect to the active material layer of other regions.

Description

電極及びその製造方法並びに製造装置Electrode, manufacturing method thereof, and manufacturing apparatus
　本発明は、例えば、リチウムイオン電池等に用いる電極及びその製造方法並びに製造装置に関するものである。 The present invention relates to an electrode used for, for example, a lithium ion battery, a manufacturing method thereof, and a manufacturing apparatus.
　JP2006-175415Aは、リチウムイオン電池の正極電極と負極電極との内部短絡を防止するために、正極電極の端子を覆って、スペーサとして機能するテープ部材を貼付ける技術を開示する。 JP2006-175415A discloses a technique for covering a terminal of a positive electrode and sticking a tape member functioning as a spacer in order to prevent an internal short circuit between a positive electrode and a negative electrode of a lithium ion battery.
　この関連技術において、表面に活物質層が長手方向に塗布された帯状電極に、活物質層が形成されずに電極表面が露出して幅方向に延びる領域が、一定間隔毎に形成される。そして、露出した電極表面には超音波溶接等により電極端子が接合され、この電極端子表面や露出した電極表面と活物質層の縁部分の領域とに跨って、帯状電極の幅方向にテープ部材が貼り付けられる。 In this related technique, on the belt-like electrode having the active material layer applied in the longitudinal direction on the surface, the active material layer is not formed but the electrode surface is exposed and the region extending in the width direction is formed at regular intervals. An electrode terminal is joined to the exposed electrode surface by ultrasonic welding or the like, and the tape member extends in the width direction of the belt-like electrode across the electrode terminal surface, the exposed electrode surface and the region of the edge portion of the active material layer. Is pasted.
　また、あるタイプの帯状電極においては、幅方向の一端若しくは両端に活物質層を塗布しない未塗工領域が形成され、その未塗工領域は、電極端子を接続するタブとして使用される。このような帯状電極においては、正極電極と負極電極との内部短絡を防止するために、タブと活物質層の縁部分とに跨って、スペーサとして機能するテープ部材が貼付け等により配設される。 Also, in a certain type of strip electrode, an uncoated region where no active material layer is applied is formed at one or both ends in the width direction, and the uncoated region is used as a tab for connecting electrode terminals. In such a strip electrode, in order to prevent an internal short circuit between the positive electrode and the negative electrode, a tape member functioning as a spacer is disposed by pasting or the like across the tab and the edge portion of the active material layer. .
　しかしながら、未塗工領域と活物質層の縁領域とに跨って、スペーサとして機能するテープ部材が帯状電極の長手方向に連続して配設されると、テープ部材が活物質層に重なる部分が局部的に厚くなり、得られた帯状電極を一様に巻取ることが難しい。このため、帯状電極への活物質層の塗布後に連続させて、テープ部材の配設作業が実施できず、帯状電極の生産性が向上できない。 However, when the tape member functioning as a spacer is continuously disposed in the longitudinal direction of the strip electrode across the uncoated region and the edge region of the active material layer, the portion where the tape member overlaps the active material layer is It becomes thick locally and it is difficult to wind up the obtained strip electrode uniformly. For this reason, the arrangement | positioning operation | work of a tape member cannot be implemented continuously after application | coating of the active material layer to a strip | belt-shaped electrode, and productivity of a strip | belt-shaped electrode cannot be improved.
　本発明は、活物質層の塗布に連続させてスペーサとして機能するテープ部材の配設作業を実施するに好適な電極、及び、その電極の製造方法並びに製造装置を提供することを目的とする。 An object of the present invention is to provide an electrode suitable for performing an operation of arranging a tape member that functions as a spacer in succession to the application of an active material layer, and a method and an apparatus for manufacturing the electrode.
　製造装置が製造する電極は、帯状の電極原反の幅方向の少なくとも一端部に長手方向に延びる活物質を塗布しない未塗工領域と、幅方向の残部に前記活物質が長手方向に連続的に塗布された前記活物質層と、を備える。そして、電極には、未塗工領域と活物質層との境界部分を跨いで両者のそれぞれの一部を覆った、絶縁材よりなるスペーサ部材が長手方向に配置される。そして、製造装置は、スペーサ部材が配置される領域の活物質層の厚みが、その他の領域の活物質層の厚みに対して段差をもって薄肉となるように、電極原反に活物質を塗布する塗工部を備える。また、製造装置は、塗布された活物質層の薄肉部の少なくとも一部と未塗工領域の一部とを覆ってスペーサを配置するスペーサ配置部を備える。 The electrode manufactured by the manufacturing apparatus has an uncoated region in which the active material extending in the longitudinal direction is not applied to at least one end in the width direction of the strip-shaped electrode raw material, and the active material is continuous in the longitudinal direction in the remaining width direction. And the active material layer applied to the surface. A spacer member made of an insulating material is disposed in the longitudinal direction on the electrode so as to straddle the boundary portion between the uncoated region and the active material layer and cover a part of each. Then, the manufacturing apparatus applies the active material to the electrode material so that the thickness of the active material layer in the region where the spacer member is disposed is thin with a step with respect to the thickness of the active material layer in the other region. A coating section is provided. Further, the manufacturing apparatus includes a spacer arrangement portion that arranges a spacer so as to cover at least a part of the thin part of the applied active material layer and a part of the uncoated region.
　本発明の実施形態、本発明の利点については、添付された図面を参照しながら以下に詳細に説明する。 Embodiments of the present invention and advantages of the present invention will be described in detail below with reference to the accompanying drawings.
図１は、本発明の第１実施形態の電極の製造装置の第１例を示す概略構成図である。FIG. 1 is a schematic configuration diagram illustrating a first example of an electrode manufacturing apparatus according to a first embodiment of the present invention. 図２は、ダイコータの斜視図である。FIG. 2 is a perspective view of the die coater. 図３は、ダイコータに使用するシムの斜視図である。FIG. 3 is a perspective view of a shim used in the die coater. 図４は、ダイコータのスリットを示す正面図である。FIG. 4 is a front view showing a slit of the die coater. 図５は、塗布され乾燥された活物質層を備える電極原反の断面図である。FIG. 5 is a cross-sectional view of an electrode fabric provided with an active material layer that has been applied and dried. 図６は、シム形状の具体例を示すダイコータのスリットを示す正面図である。FIG. 6 is a front view showing a slit of a die coater showing a specific example of a shim shape. 図７は、シム形状の別の具体例を示す斜視図である。FIG. 7 is a perspective view showing another specific example of a shim shape. 図８は、ダイコータのスリットの一例を示す正面図である。FIG. 8 is a front view showing an example of a slit of the die coater. 図９は、貼付けローラを示す正面図である。FIG. 9 is a front view showing the sticking roller. 図１０は、保護テープを貼付けた状態の電極原反の断面図である。FIG. 10 is a cross-sectional view of the original electrode fabric in a state where a protective tape is applied. 図１１は、帯状電極の巻取り状態を示す斜視図である。FIG. 11 is a perspective view showing a winding state of the strip electrode. 図１２は、第１実施形態の第２例の電極の製造装置を示す概略構成図である。FIG. 12 is a schematic configuration diagram illustrating an electrode manufacturing apparatus according to a second example of the first embodiment. 図１３は、本発明の第２実施形態の電極の製造装置を示す概略構成図である。FIG. 13: is a schematic block diagram which shows the manufacturing apparatus of the electrode of 2nd Embodiment of this invention. 図１４は、絶縁材を塗布するダイコータのスリット形状を示す正面図である。FIG. 14 is a front view showing a slit shape of a die coater for applying an insulating material. 図１５は、塗布された活物質層を備える電極原反の断面図である。FIG. 15 is a cross-sectional view of an electrode material having a coated active material layer. 図１６は、活物質層と保護層とが塗布された電極原反の断面図である。FIG. 16 is a cross-sectional view of an electrode raw fabric coated with an active material layer and a protective layer.
　以下、電極の製造方法および製造装置を各実施形態に基づいて説明する。 Hereinafter, an electrode manufacturing method and a manufacturing apparatus will be described based on each embodiment.
　＜第１実施形態＞
　図１は、第１実施形態の電極の製造装置の第１例を示す概略構成図である。図１において、電極の製造装置は、金属箔からなる電極原反１（電極バンド、電極シート、又は、電極箔）の巻き出し部２と巻取り部１０との間に、電極原反１の両面に活物質を塗布する２つの塗工部３，５と、塗布された活物質層１２を電極原反１のそれぞれの面で乾燥する２つの乾燥部４，６と、を備える。また、電極の製造装置は、活物質層１２の両側にスペーサとしての保護テープ１３を貼付ける貼付け部７と、活物質層１２をロールプレスするプレス部８と、を備える。プレス部８と巻取り部１０との間には、得られた帯状電極を２つの帯状電極に分割するスリット部９が追加されている。図１では、電極原反１の両面に活物質層１２を形成するように、２つの塗工部３，５と２つの乾燥部４，６が配置されている。 <First Embodiment>
FIG. 1 is a schematic configuration diagram illustrating a first example of an electrode manufacturing apparatus according to the first embodiment. In FIG. 1, an electrode manufacturing apparatus includes an electrode raw fabric 1 between an unwinding portion 2 and a winding portion 10 of an electrode raw fabric 1 (electrode band, electrode sheet, or electrode foil) made of metal foil. Two coating parts 3 and 5 which apply an active material on both sides, and two drying parts 4 and 6 which dry the applied active material layer 12 on each side of electrode raw fabric 1 are provided. The electrode manufacturing apparatus also includes an affixing unit 7 that affixes protective tape 13 as a spacer on both sides of the active material layer 12 and a press unit 8 that roll-presses the active material layer 12. Between the press part 8 and the winding part 10, the slit part 9 which divides the obtained strip electrode into two strip electrodes is added. In FIG. 1, two coating parts 3 and 5 and two drying parts 4 and 6 are arranged so that the active material layer 12 is formed on both surfaces of the electrode raw fabric 1.
　巻き出し部２は、リール状に巻かれた金属箔からなる電極原反１を取り付ける部分であり、正極用または負極用の電極原反１を巻き出して、塗工部３（前面塗工部）、乾燥部４（前面乾燥部）、裏面塗工部５、裏面乾燥部６に供給する。 The unwinding part 2 is a part to which the electrode raw material 1 made of a metal foil wound in a reel shape is attached. The unwinding electrode raw material 1 for positive electrode or negative electrode is unwound and applied to the coating part 3 (front surface coating part). ), Drying unit 4 (front surface drying unit), back surface coating unit 5, and back surface drying unit 6.
　塗工部３（裏面塗工部５）は、巻き出された電極原反１にダイコータにより活物質を塗布して、電極原反１の表面に活物質層１２を形成する。電極原反１の幅方向の両端において、例えば、端面から１０ｍｍの幅において、活物質層１２が塗布されない領域が、未塗工領域１１として、電極原反１の長手方向に設けられる。なお、幅方向と長手方向は互いに垂直である。未塗工領域１１は、電極タブとして使用される。このため、活物質層１２は、電極原反１の幅方向両端の未塗工領域１１を除く領域に形成される。また、後述するように、塗布される活物質層１２は、その中央領域では通常の膜厚を有する厚肉部１２Ａに形成される。しかし、電極原反１の幅方向両端から所定の幅においては、厚肉部１２Ａの膜厚よりも薄い厚さ寸法の薄肉部１２Ｂが長手方向に沿って存在する。乾燥部４（裏面乾燥部６）は、塗布された活物質層１２に含まれる希釈溶媒を揮発乾燥させる。 The coating unit 3 (back coating unit 5) applies an active material to the unrolled electrode raw material 1 with a die coater to form an active material layer 12 on the surface of the electrode raw material 1. At both ends in the width direction of the electrode original fabric 1, for example, in a width of 10 mm from the end face, a region where the active material layer 12 is not applied is provided as an uncoated region 11 in the longitudinal direction of the electrode original fabric 1. Note that the width direction and the longitudinal direction are perpendicular to each other. The uncoated region 11 is used as an electrode tab. For this reason, the active material layer 12 is formed in the area | region except the uncoated area | region 11 of the width direction both ends of the electrode raw fabric 1. FIG. Further, as will be described later, the applied active material layer 12 is formed in a thick portion 12A having a normal film thickness in the central region. However, in a predetermined width from both ends in the width direction of the electrode fabric 1, there are thin portions 12B having a thickness smaller than the thickness of the thick portion 12A along the longitudinal direction. The drying unit 4 (back surface drying unit 6) volatilizes and drys the diluted solvent contained in the applied active material layer 12.
　貼付け部７は、塗布され乾燥された活物質層１２の幅方向両端の薄肉部１２Ｂの全部又は一部を覆うと共に薄肉部１２Ｂの幅方向外側に連なる未塗工領域１１の一部を覆って、スペーサとして機能する保護テープ１３を貼付ける。 The pasting part 7 covers all or part of the thin part 12B at both ends in the width direction of the active material layer 12 that has been applied and dried, and covers a part of the uncoated region 11 that continues to the outside in the width direction of the thin part 12B. The protective tape 13 that functions as a spacer is pasted.
　プレス部８は、圧延ロール間に、活物質層１２が形成され保護テープ１３が両端領域に貼付けられた電極原反１を通過させることにより、活物質層１２の充填密度を高めるとともに均一化して、帯状電極を完成する。 The pressing unit 8 increases the packing density of the active material layer 12 and makes it uniform by passing the electrode raw material 1 in which the active material layer 12 is formed and the protective tape 13 is attached to both end regions between the rolling rolls. Complete the strip electrode.
　ここで、塗工部３及び裏面塗工部５の構成を説明する。なお、塗工部３及び裏面塗工部５は、同様に構成されているため、塗工部３について説明することで、裏面塗工部５の説明を省略する。塗工部３は、図１に示すように、電極原反１が巻回されたバックアップローラ２１と、該バックアップローラ２１上を通過する電極原反１に塗液を塗り付けるダイコータ２０と、を備える。以下、電極原反１の幅方向を、塗工部３の『幅方向』と記載する。従って、電極原反１が巻き付けられたバックアップローラ２１の軸と略平行な方向は、幅方向となる。 Here, the structure of the coating part 3 and the back surface coating part 5 is demonstrated. In addition, since the coating part 3 and the back surface coating part 5 are comprised similarly, description of the back surface coating part 5 is abbreviate | omitted by demonstrating the coating part 3. FIG. As shown in FIG. 1, the coating unit 3 includes a backup roller 21 around which the electrode fabric 1 is wound, and a die coater 20 that applies a coating solution to the electrode fabric 1 that passes over the backup roller 21. . Hereinafter, the width direction of the electrode raw fabric 1 is referred to as the “width direction” of the coating portion 3. Therefore, the direction substantially parallel to the axis of the backup roller 21 around which the electrode fabric 1 is wound is the width direction.
　塗工部３は、バックアップローラ２１以外に、単数又は複数のガイドローラ２２を備え、電極原反１がテンションを有して巻回される。これらのローラ２２の回転により、ロール状に巻き取られた電極原反１が所定の速度で連続的に塗工部３に繰り出され、また、乾燥部４まで搬送される。 The coating unit 3 includes one or a plurality of guide rollers 22 in addition to the backup roller 21, and the electrode fabric 1 is wound with tension. Due to the rotation of the rollers 22, the electrode raw material 1 wound up in a roll shape is continuously fed out to the coating unit 3 at a predetermined speed, and is conveyed to the drying unit 4.
　ダイコータ２０は、図示しない塗液タンクから供給される塗液を、くちばし状のノズル２３に開口されたスリット２４から流出させて、バックアップローラ２１上の電極原反１に塗り付ける。ダイコータ２０のノズル２３のスリット２４は、電極原反１の幅方向に長尺であって、スリット２４の開口幅は電極原反１に対して塗液が塗布される規定幅を定める。 The die coater 20 causes a coating liquid supplied from a coating liquid tank (not shown) to flow out from the slit 24 opened in the beak-shaped nozzle 23 and is applied to the electrode fabric 1 on the backup roller 21. The slit 24 of the nozzle 23 of the die coater 20 is long in the width direction of the electrode original fabric 1, and the opening width of the slit 24 defines a prescribed width in which the coating liquid is applied to the electrode raw fabric 1.
　ダイコータ２０のノズル２３のスリット２４は、図２－図４に示すように、塗工幅を設定して厚さ寸法が薄い（例えば、０．３ｍｍ）第１シム２５と、このシム２５より塗工幅が狭く（例えば、両側で各４ｍｍ狭い）、厚さ寸法がやや厚い（例えば、０．５ｍｍ）第２シム２６とを重ね合せて形成されている。即ち、一方のダイヘッド２０Ａのノズル形成面に、第１シム２５、第２シム２６の順に重ね、さらに他方のダイヘッド２０Ｂのノズル形成面を重ね合わせて、図示しない固定用ボルトにより締め込み固定する。これにより、図４に示すように、幅方向の両端領域で薄く、両端領域を除く中央領域で厚くなったスリット２４が形成される。 As shown in FIG. 2 to FIG. 4, the slit 24 of the nozzle 23 of the die coater 20 has a first shim 25 with a coating width set to be thin (for example, 0.3 mm) and a coating applied from the shim 25. It is formed by overlapping a second shim 26 having a narrow work width (for example, 4 mm narrow on both sides) and a slightly thick thickness (for example, 0.5 mm). That is, the first shim 25 and the second shim 26 are overlapped in this order on the nozzle forming surface of one die head 20A, and the nozzle forming surface of the other die head 20B is further overlapped and fixed by fastening bolts (not shown). As a result, as shown in FIG. 4, slits 24 are formed which are thin in both end regions in the width direction and thick in the central region excluding both end regions.
　このため、第１、２シム２５，２６の組合せを変更することにより、活物質層１２の薄肉部１２Ｂと厚肉部１２Ａの幅及び厚さを任意に変更することができる。これにより、電極の品種毎に専用のシムと交換する必要がなく、設備費を低減できる。また、ダイコータ２０は、単純な平板状のシム２５，２６を重ねて形成したものであるため、スリット２４の形状を高精度に形成でき、ダイコータ２０の使用時における塗工精度を向上できる。 Therefore, by changing the combination of the first and second shims 25 and 26, the width and thickness of the thin portion 12B and the thick portion 12A of the active material layer 12 can be arbitrarily changed. Thereby, it is not necessary to exchange a dedicated shim for each type of electrode, and the equipment cost can be reduced. Further, since the die coater 20 is formed by overlapping simple flat shims 25 and 26, the shape of the slit 24 can be formed with high accuracy, and the coating accuracy when the die coater 20 is used can be improved.
　塗工用ダイコータ２０が塗工機のダイコータ取付け位置に設置され、乾燥部４，６が乾燥条件温度まで上昇した後に、ダイコータ２０に電極スラリーが供給されて電極原反１に対して塗布が開始する。ダイコータ２０から電極原反１に塗布される活物質層１２は、その中央領域では、通常の膜厚（厚肉部１２Ａ）を有する。しかし、段差塗工（段状塗工）の実施によって、活物質層１２の幅方向両端は、中央領域に塗布される通常の膜厚（厚肉部１２Ａ）より薄い厚さ寸法を有し、薄肉部１２Ｂとなる。薄肉部１２Ｂの厚みは、例えば、２～１０ｍｍの幅寸法において、３０μｍ以上であり且つ中央領域に塗布される通常の膜厚より４０μｍ以上小さい。塗布された活物質層１２は、乾燥部４，６で乾燥された後に貼付け部７に搬送される。なお、詳細構造は図示しないが、裏面塗工部５は、電極原反１の他方の面（裏面）に、塗工部３と同様の塗工用のダイコータを用いて同様に段差塗工を実施し、裏面乾燥部６は、裏面の活物質層１２を乾燥する。 After the coating die coater 20 has been installed at the die coater mounting position of the coating machine and the drying units 4 and 6 have risen to the drying condition temperature, the electrode slurry is supplied to the die coater 20 and coating on the electrode raw material 1 is started. To do. The active material layer 12 applied to the electrode raw fabric 1 from the die coater 20 has a normal film thickness (thick portion 12A) in the central region. However, by performing step coating (step coating), both ends in the width direction of the active material layer 12 have a thickness dimension smaller than a normal film thickness (thick portion 12A) applied to the central region, The thin portion 12B is formed. The thickness of the thin portion 12B is, for example, 30 μm or more in a width dimension of 2 to 10 mm and 40 μm or less smaller than the normal film thickness applied to the central region. The applied active material layer 12 is transported to the pasting unit 7 after being dried by the drying units 4 and 6. Although the detailed structure is not shown in the drawing, the back surface coating unit 5 applies the same step coating to the other surface (back surface) of the electrode raw fabric 1 using the same coating die coater as the coating unit 3. In practice, the back surface drying unit 6 dries the active material layer 12 on the back surface.
　以上により、両面に活物質層１２が形成された電極原反１は、図５に示すように、段差塗工された活物質層１２を備え、中央領域では通常の膜厚の厚肉部１２Ａを備え、その幅方向両端では中央領域の膜厚より薄い厚さ寸法の薄肉部１２Ｂを備える。 As described above, the electrode raw fabric 1 having the active material layer 12 formed on both sides includes the active material layer 12 coated with a step as shown in FIG. 5, and a thick portion 12A having a normal film thickness in the central region. And the thin portion 12B having a thickness smaller than the thickness of the central region is provided at both ends in the width direction.
　なお、段差塗工される活物質層１２の厚肉部１２Ａ及び薄肉部１２Ｂの角部において、垂れを防止するために、図６に示すように、第１，２シム２５，２６の端面が斜面２５Ａ，２６Ａであってよい。これにより、塗布された活物質層１２の厚肉部１２Ａ及び薄肉部１２Ｂの角部が鋭角となり得る。また、同様の目的のために、塗布された直後の活物質層１２の厚肉部１２Ａ及び薄肉部１２Ｂの角部に近接させて加熱装置を配置して、当該角部を乾燥炉による乾燥硬化に先行して硬化させてもよい。 In order to prevent dripping at the corners of the thick portion 12A and the thin portion 12B of the active material layer 12 to be step-coated, the end faces of the first and second shims 25, 26 are provided as shown in FIG. It may be slopes 25A, 26A. Thereby, the corner | angular part of the thick part 12A and the thin part 12B of the apply | coated active material layer 12 may become an acute angle. For the same purpose, a heating device is disposed in the vicinity of the corners of the thick part 12A and the thin part 12B of the active material layer 12 immediately after being applied, and the corners are dried and cured by a drying furnace. It may be cured prior to.
　ダイコータ２０に設けるシムは、上記した構成に限定されるものでなく、例えば、図７に示すように構成してもよい。図７においては、段付きシム２７は、上記した第１シム２５と第２シム２６とを一体化した形状を有し、両端に突出して形成した厚肉部分２７Ａと、厚肉部分２７Ａから内側に延びる薄肉部分２７Ｂとを一体に備える。そして、厚肉部分２７Ａは、活物質層１２の両薄肉部１２Ｂを含む幅寸法の塗工幅を設定し、薄肉部分２７Ｂは、活物質層１２の薄肉部１２Ｂと厚肉部１２Ａとを設定する。段付きシム２７は、シム素材を熱変形させることなく削ることにより薄肉部分２７Ｂを形成して作成できる。シムを交換するのみで、薄肉部１２Ｂと厚肉部１２Ａとの幅及び厚さを任意に変更することができる。そして、電極の品種毎にダイヘッド２０Ａ，２０Ｂを交換する必要がなく、設備費を低減できる。 The shim provided in the die coater 20 is not limited to the above-described configuration, and may be configured as shown in FIG. In FIG. 7, the stepped shim 27 has a shape in which the first shim 25 and the second shim 26 described above are integrated, and a thick portion 27 </ b> A that protrudes from both ends, and an inner side from the thick portion 27 </ b> A. And a thin-walled portion 27 </ b> B extending integrally with each other. And the thick part 27A sets the coating width of the width dimension including both the thin parts 12B of the active material layer 12, and the thin part 27B sets the thin part 12B and the thick part 12A of the active material layer 12 To do. The stepped shim 27 can be formed by forming the thin portion 27B by cutting the shim material without thermally deforming it. The width and thickness of the thin wall portion 12B and the thick wall portion 12A can be arbitrarily changed by simply replacing the shim. And it is not necessary to exchange die head 20A, 20B for every kind of electrode, and equipment cost can be reduced.
　また、ダイコータ２０のスリット２４の形状を上記のようにシムを用いることなく、図８に示すように、一方のダイヘッド２０Ｂの先端リップ形状を段付き形状とすることにより形成してもよい。この場合には、ダイヘッド２０Ｂを研削等の機械加工により段付き形状に形成できる。 Further, the shape of the slit 24 of the die coater 20 may be formed by making the tip lip shape of one die head 20B into a stepped shape as shown in FIG. 8 without using a shim as described above. In this case, the die head 20B can be formed into a stepped shape by machining such as grinding.
　貼付け部７は、スペーサとして機能する保護テープ１３を連続的に貼付ける。保護テープ１３は、塗布され乾燥された活物質層１２の幅方向両端の薄肉部１２Ｂの少なくとも一部を覆うと共に、薄肉部１２Ｂの幅方向外側に連なる未塗工領域１１の一部を覆う。保護テープ１３は、電極原反１の一方の面の両側にそれぞれ一本づつ、他方の面の両側にそれぞれ一本づつの合計４個貼付けられる。 The affixing unit 7 continuously affixes the protective tape 13 that functions as a spacer. The protective tape 13 covers at least a part of the thin part 12B at both ends in the width direction of the coated and dried active material layer 12 and also covers a part of the uncoated region 11 connected to the outer side in the width direction of the thin part 12B. A total of four protective tapes 13 are affixed, one on each side of one side of the electrode fabric 1 and one on each side of the other side.
　保護テープ１３は、例えば、１０ｍｍ前後、好ましくは７ｍｍの幅寸法を有し、例えば、２０μｍ～８０μｍ、好ましくは３０μｍの厚さ寸法を有する。保護テープ１３の材料は、ポリイミド、ポリエステル、ポリフッ化ビニリデン、等、絶縁性に優れる材料であれば良い。 The protective tape 13 has a width dimension of, for example, about 10 mm, preferably 7 mm, and has a thickness dimension of, for example, 20 μm to 80 μm, preferably 30 μm. The material of the protective tape 13 may be any material that has excellent insulating properties, such as polyimide, polyester, polyvinylidene fluoride, and the like.
　また、貼付け部７は、電極原反１の幅方向のずれに追従させて、保護テープ１３を追従させて、安定的に貼付ける。貼付け部７の追従装置として、例えば、ＥＰＣ装置（エッジ・ポジション・コントロール、Ｅｄｇｅ・Ｐｏｓｉｔｉｏｎ・Ｃｏｎｔｒｏｌの略称。ニレコの登録商標である）が使用される。また、貼付けローラ３０として、図９に示すように、樽状のクラウンロールが使用される。クラウン状（樽形）の貼付けロール３０は、その形状から、常にロール３０の中央部にテンションを集中する。従って、保護テープ１３の走行が安定し、保護テープ１３の位置ずれの防止を図ることができ、常に狙いの位置に保護テープ１３を貼ることができる。 Also, the affixing portion 7 follows the displacement in the width direction of the electrode fabric 1 and follows the protective tape 13 to stably affix. For example, an EPC device (edge position control, abbreviation for Edge Position Control), which is a registered trademark of Nireco) is used as the follow-up device of the pasting unit 7. Moreover, as shown in FIG. 9, a barrel-shaped crown roll is used as the sticking roller 30. The crown-shaped (barrel-shaped) sticking roll 30 always concentrates tension on the center of the roll 30 from its shape. Accordingly, the traveling of the protective tape 13 is stabilized, the positional deviation of the protective tape 13 can be prevented, and the protective tape 13 can be always stuck at the target position.
　図１０は、貼付け部７で保護テープ１３が貼付けられた状態を示す。保護テープ１３の厚さは、薄肉で、例えば、３０μｍであり、活物質層１２の薄肉部１２Ｂと厚肉部１２Ａの段差の寸法と比較して小さい。例えば、薄肉部１２Ｂの厚さ寸法が３０～５０μｍであり、厚肉部１２Ａの厚さ寸法が１２０μｍである場合には、厚肉部１２Ａと薄肉部１２Ｂとの段差の寸法は、７０～９０μｍとなり、３０μｍの厚みの保護テープ１３は、段差の寸法内に充分収まる。このため、保護テープ１３の表面が厚肉部１２Ａを構成する活物質層１２の表面より盛り上がることなく、保護テープ１３が貼付けられる。また、下流のプレス部８により厚肉部１２Ａが、例えば、４０μｍだけ圧縮されて段差の寸法が３０～５０μｍに縮まったとしても、保護テープ１３の表面が厚肉部１２Ａを構成する活物質層１２の表面より盛り上がることを防止できる。 FIG. 10 shows a state in which the protective tape 13 is pasted at the pasting unit 7. The thickness of the protective tape 13 is thin, for example, 30 μm, and is smaller than the dimension of the step between the thin portion 12B and the thick portion 12A of the active material layer 12. For example, when the thickness of the thin portion 12B is 30 to 50 μm and the thickness of the thick portion 12A is 120 μm, the step size between the thick portion 12A and the thin portion 12B is 70 to 90 μm. Thus, the protective tape 13 having a thickness of 30 μm is sufficiently accommodated within the step size. For this reason, the protective tape 13 is affixed, without the surface of the protective tape 13 rising from the surface of the active material layer 12 which comprises the thick part 12A. Further, even if the thick portion 12A is compressed by 40 μm by the downstream press portion 8 and the step size is reduced to 30 to 50 μm, for example, the active material layer whose surface of the protective tape 13 constitutes the thick portion 12A It is possible to prevent swelling from the 12 surfaces.
　また、段差の寸法が大きくなく、プレス部８での圧縮により、厚肉部１２Ａが圧縮されることにより、保護テープ１３と薄肉部１２Ｂとが圧延ロールによりプレスされる場合も考えられる。この場合には、薄肉部１２Ｂが薄くなることにより、保護テープ１３の表面と厚肉部１２Ａの表面とが同一面に形成される。従って、保護テープ１３の表面が厚肉部１２Ａを構成する活物質層１２の表面より盛り上がることを防止できる。 In addition, there may be a case where the dimension of the step is not large and the protective tape 13 and the thin portion 12B are pressed by the rolling roll by compressing the thick portion 12A by compression at the press portion 8. In this case, the surface of the protective tape 13 and the surface of the thick portion 12A are formed on the same surface by thinning the thin portion 12B. Therefore, the surface of the protective tape 13 can be prevented from rising from the surface of the active material layer 12 constituting the thick portion 12A.
　保護テープ１３が貼付けられた電極原反１は、プレス部８に搬送され、プレス部８の圧延ロール間を通過する。これにより、活物質層１２の充填密度が高められるとともに均一化されて、電極原反１は帯状電極となる。次いで、スリット部９を通過することにより、帯状電極は、幅方向の中央部で分割される。分割された帯状電極は、次工程により所定長さに切断されることにより、それ自体で電極板を形成することができる。スリット部９で分割された帯状電極は、図１１に示すように、左右の部分の一対（若しくは左右の部分それぞれ）が、巻取り部１０の巻取りローラ３１に巻取られる。 The electrode fabric 1 with the protective tape 13 attached is conveyed to the press unit 8 and passes between the rolling rolls of the press unit 8. Thereby, the packing density of the active material layer 12 is increased and uniformized, and the electrode raw fabric 1 becomes a strip electrode. Next, by passing through the slit portion 9, the strip electrode is divided at the central portion in the width direction. The divided strip-shaped electrode is cut into a predetermined length in the next step, so that an electrode plate can be formed by itself. As shown in FIG. 11, the pair of left and right portions (or the left and right portions) of the strip electrode divided by the slit portion 9 is wound around the winding roller 31 of the winding portion 10.
　図１２は、第２例の電極の製造装置では、プレス部８の下流に貼付け部７が配列される。その他の構成は第１例と同様である。 FIG. 12 shows that in the electrode manufacturing apparatus of the second example, the affixing part 7 is arranged downstream of the pressing part 8. Other configurations are the same as those in the first example.
　塗工部３，５で活物質層１２が塗布され乾燥部４，６で乾燥された電極原反１は、プレス部８の圧延ロール間を通過し、厚肉部１２Ａを構成する活物質層１２が圧縮され充填密度が高められるとともに均一化される。 The electrode material 1 coated with the active material layer 12 in the coating parts 3 and 5 and dried in the drying parts 4 and 6 passes between the rolling rolls of the press part 8 and forms the thick part 12A. 12 is compressed and the packing density is increased and uniformized.
　貼付け部７は、スペーサとして機能する保護テープ１３を連続的に貼付ける。保護テープ１３は、プレスされた活物質層１２を備える電極原反１のプレスされない薄肉部１２Ｂの少なくとも一部と、薄肉部１２Ｂの幅方向外側に連なる未塗工領域１１の一部とを覆う。保護テープ１３を貼付ける薄肉部１２Ｂは、プレス部８での圧縮を受けていないので、プレス部８により圧縮を受けた厚肉部１２Ａに対する段差の寸法が小さくなる。このため、プレス部８での圧縮後の段差の寸法が、貼付ける保護テープ１３の厚さ寸法より、大きくなるように設定される。例えば、保護テープ１３の厚さ寸法が３０μｍであり、プレス部８で厚肉部１２Ａの活物質層１２が、１２３μｍから８０μｍへと、圧縮される場合には、塗工部３，５で形成する薄肉部１２Ｂの厚さ寸法を５０μｍ以下とすることにより、保護テープ１３の表面が厚肉部１２Ａの表面より盛り上がることを防止できる。 The affixing unit 7 continuously affixes the protective tape 13 that functions as a spacer. The protective tape 13 covers at least a part of the unpressed thin part 12B of the electrode raw fabric 1 including the pressed active material layer 12 and a part of the uncoated region 11 connected to the outer side in the width direction of the thin part 12B. . Since the thin-walled portion 12B to which the protective tape 13 is applied has not been compressed by the press portion 8, the size of the step with respect to the thick-walled portion 12A compressed by the press portion 8 is reduced. For this reason, the dimension of the level | step difference after compression in the press part 8 is set so that it may become larger than the thickness dimension of the protective tape 13 to paste. For example, when the thickness of the protective tape 13 is 30 μm and the active material layer 12 of the thick portion 12A is compressed from 123 μm to 80 μm by the press portion 8, it is formed by the coating portions 3 and 5. By making the thickness dimension of the thin part 12B to be 50 μm or less, the surface of the protective tape 13 can be prevented from rising from the surface of the thick part 12A.
　なお、上記実施形態において、長手方向に延びる活物質を塗布しない未塗工領域１１は、帯状の電極原反１の幅方向の両端部に設けられる。しかし、長手方向に延びる活物質を塗布しない未塗工領域１１は、帯状の電極原反１の幅方向の一端部に設けられてもよい。また、幅方向の端部に加えて、幅方向中央部に未塗工領域１１を備えるように電極原反１が形成されてもよい。 In the above embodiment, the uncoated regions 11 where the active material extending in the longitudinal direction is not applied are provided at both ends in the width direction of the strip-shaped electrode raw fabric 1. However, the uncoated region 11 where the active material extending in the longitudinal direction is not applied may be provided at one end portion in the width direction of the strip-shaped electrode raw fabric 1. Moreover, in addition to the edge part of the width direction, the electrode raw fabric 1 may be formed so that the uncoated area | region 11 may be provided in the width direction center part.
　本実施形態においては、以下に記載する効果を奏することができる。 In the present embodiment, the following effects can be achieved.
　（ａ）電極は、帯状の電極原反１の幅方向の少なくとも一端部に長手方向に延びて活物質を塗工しない未塗工領域１１と、幅方向の残部（即ち未塗工領域１１以外の部分）に活物質が長手方向に連続的に塗布された活物質層１２と、を備える。そして、電極には、未塗工領域１１と活物質層１２との境界部分を跨いで両者のそれぞれの一部を覆った、絶縁材よりなるスペーサ部材としての保護テープ１３が長手方向に配置される。このような電極の製造装置及び製造方法が提供される。そして、製造装置の塗工部３，５は、塗工工程を実施し、活物質層１２の未塗工領域１１に隣接するスペーサ部材が配置される領域の活物質層１２の厚みを、その他の領域の活物質層１２の厚みに対して段差をもって薄肉となるように、電極原反１に活物質を塗布する。また、製造装置の貼付け部７は、スペーサ配置部としてスペーサ配置工程を実施し、塗布された活物質層１２の薄肉部１２Ｂの少なくとも一部と未塗工領域１１の一部とを覆ってスペーサ部材を配置する。 (A) The electrode extends in the longitudinal direction at least at one end in the width direction of the strip-shaped electrode raw fabric 1 and is not coated with an active material, and the remainder in the width direction (that is, other than the uncoated area 11) Active material layer 12 in which the active material is continuously applied in the longitudinal direction. And the protective tape 13 as a spacer member which consists of an insulating material which straddled the boundary part of the uncoated area | region 11 and the active material layer 12, and covered each part of both was arrange | positioned at the longitudinal direction at the electrode. The An apparatus and method for manufacturing such an electrode are provided. And the coating parts 3 and 5 of a manufacturing apparatus implement a coating process, the thickness of the active material layer 12 of the area | region where the spacer member adjacent to the uncoated area | region 11 of the active material layer 12 is arrange | positioned, and others The active material is applied to the electrode fabric 1 so that the thickness of the active material layer 12 in this region becomes thin with a level difference. Further, the affixing unit 7 of the manufacturing apparatus performs a spacer arrangement process as a spacer arrangement unit and covers at least a part of the thin part 12B of the applied active material layer 12 and a part of the uncoated region 11 to form a spacer. Arrange the members.
　即ち、活物質層１２の未塗工領域１１に隣接するスペーサ部材が配置される領域の活物質層１２の厚みは、その他の領域の活物質層１２の厚みに対して段差をもって薄肉部１２Ｂとなる。このため、スペーサとしての保護テープ１３を貼り付けても、電極の幅方向の両端の厚みを中央部に比較して同等以下にすることができるため、幅方向の両端が盛り上がることがなく、電極を連続して巻き取ることができる。結果として、保護テープ１３をインラインで貼り付けることができ、電極の製造工程を簡略化できる。 That is, the thickness of the active material layer 12 in the region where the spacer member adjacent to the uncoated region 11 of the active material layer 12 is arranged is different from the thickness of the thin portion 12B with respect to the thickness of the active material layer 12 in other regions. Become. For this reason, even if the protective tape 13 as a spacer is affixed, the thickness of both ends in the width direction of the electrode can be made equal to or less than that of the central portion, so that both ends in the width direction do not rise, Can be continuously wound. As a result, the protective tape 13 can be attached in-line, and the electrode manufacturing process can be simplified.
　（ｂ）塗工部３，５は、スリットを有するダイコータ２０により、活物質を含む電極スラリーを電極原反１に塗布する。スリットは、スリットの幅方向の両端部で、中央部よりもスリットの開口寸法が薄くなる。このため、電極原反１に薄肉部１２Ｂと厚肉部１２Ａとを備える活物質層１２を連続して形成することができる。 (B) The coating units 3 and 5 apply the electrode slurry containing the active material to the electrode raw fabric 1 by the die coater 20 having a slit. The slit has an opening dimension thinner at both ends in the width direction of the slit than at the center. For this reason, the active material layer 12 provided with the thin part 12B and the thick part 12A in the electrode raw fabric 1 can be formed continuously.
　（ｃ）ダイコータ２０のスリットの形状は、ダイヘッド２０Ａ，２０Ｂに挟んだシム２７の開口に臨む形状により構成した。シム２７を交換するのみで、薄肉部１２Ｂと厚肉部１２Ａとの幅及び厚さを任意に変更することができる。電極の品種毎にダイヘッド２０Ａ，２０Ｂを交換する必要がなく、設備費を低減できる。 (C) The shape of the slit of the die coater 20 was configured to face the opening of the shim 27 sandwiched between the die heads 20A and 20B. Only by replacing the shim 27, the width and thickness of the thin portion 12B and the thick portion 12A can be arbitrarily changed. There is no need to replace the die heads 20A and 20B for each type of electrode, and the equipment cost can be reduced.
　（ｄ）シムは、活物質層１２の薄肉部１２Ｂの未塗工領域１１との境界領域を設定する第１シム２５と、第１シム２５に重ねられて薄肉部１２Ｂの上面及びその他の領域の活物質層１２の幅を設定する第２シム２６とを備える。このため、第１と第２シム２５，２６の組合せを変更することにより薄肉部１２Ｂと厚肉部１２Ａとの幅及び厚さを任意に変更できる。従って、電極の品種毎に専用のシムと交換する必要がなく、設備費を低減できる。また、シムは、単純な平板状のシム２５，２６を重ねて形成されているため、形状を高精度に形成でき、ダイヘッド２０Ａ，２０Ｂでの使用時における塗工精度を向上できる。 (D) The shim is a first shim 25 that sets a boundary region with the uncoated region 11 of the thin portion 12B of the active material layer 12, and the upper surface of the thin portion 12B and other regions that overlap the first shim 25 And a second shim 26 for setting the width of the active material layer 12. For this reason, by changing the combination of the first and second shims 25 and 26, the width and thickness of the thin portion 12B and the thick portion 12A can be arbitrarily changed. Therefore, it is not necessary to replace a dedicated shim for each type of electrode, and the equipment cost can be reduced. Further, since the shim is formed by overlapping simple flat shims 25 and 26, the shape can be formed with high accuracy, and the coating accuracy when used in the die heads 20A and 20B can be improved.
　また、段差塗工される活物質層１２の厚肉部１２Ａ及び薄肉部１２Ｂの角部の垂れを防止するために、第１と第２シム２５，２６の端面が斜面２５Ａ，２６Ａにより形成されて、塗布された活物質層１２の厚肉部１２Ａ及び薄肉部１２Ｂの角部が鋭角になり得る。また、同様の目的のために、塗布された直後の活物質層１２の厚肉部１２Ａ及び薄肉部１２Ｂの角部に近接させて加熱装置を配置して、当該角部が、乾燥炉による乾燥硬化に先行して硬化されてもよい。 Further, in order to prevent sagging of the corners of the thick portion 12A and the thin portion 12B of the active material layer 12 to be step-coated, the end surfaces of the first and second shims 25, 26 are formed by the slopes 25A, 26A. Thus, the corners of the thick part 12A and the thin part 12B of the applied active material layer 12 may be acute. For the same purpose, a heating device is disposed in the vicinity of the corners of the thick part 12A and the thin part 12B of the active material layer 12 immediately after being applied, and the corners are dried by a drying furnace. It may be cured prior to curing.
　（ｅ）スペーサ配置部７は、乾燥された活物質層１２若しくは乾燥され且つプレスされた活物質層１２の薄肉部１２Ｂの少なくとも一部と未塗工領域１１の一部とを覆って、スペーサ部材としての保護テープ１３を貼付ける。このため、スペーサ部材としての保護テープ１３を搬送されている電極原反１の活物質層１２の薄肉部１２Ｂの少なくとも一部と未塗工領域１１の一部とにインラインで連続して貼付けることができる。 (E) The spacer arrangement portion 7 covers at least a part of the dried active material layer 12 or the thin part 12B of the dried and pressed active material layer 12 and a part of the uncoated region 11 to form a spacer. The protective tape 13 as a member is affixed. For this reason, the protective tape 13 as a spacer member is continuously pasted in-line continuously to at least a part of the thin portion 12B of the active material layer 12 of the electrode fabric 1 being conveyed and a part of the uncoated region 11. be able to.
　（ｆ）スペーサ配置部７は、保護テープ１３を活物質層１２の薄肉部１２Ｂの少なくとも一部と未塗工領域１１の一部とに押付けるガイドローラ３０を備え、当該ガイドローラ３０はクラウン状の表面を備える。このため、クラウン形状によって常にロール３０の中央部に保護テープ１３のテンションを集中させることができ、保護テープ１３の走行を安定できる。従って、スペーサとしての保護テープ１３の位置ずれを防止することができ、狙い位置に高精度に保護テープ１３を貼付けることができる。 (F) The spacer arrangement portion 7 includes a guide roller 30 that presses the protective tape 13 against at least a part of the thin portion 12B of the active material layer 12 and a part of the uncoated region 11, and the guide roller 30 is a crown. Provided with a shaped surface. For this reason, the tension of the protective tape 13 can always be concentrated on the central portion of the roll 30 by the crown shape, and the traveling of the protective tape 13 can be stabilized. Therefore, the position shift of the protective tape 13 as a spacer can be prevented, and the protective tape 13 can be adhered to the target position with high accuracy.
　＜第２実施形態＞
　図１３－図１６は、本発明を適用した電極及びその製造方法並びに製造装置の第２実施形態を示す。図１３は、電極の製造装置の概略構成図である。本実施形態においては、スペーサとして機能する絶縁材を活物質層の薄肉部の上面に塗布する構成を第１実施形態に追加したものである。なお、第１実施形態と同一装置には同一符号を付してその説明を省略ないし簡略化する。 <Second Embodiment>
13 to 16 show a second embodiment of an electrode to which the present invention is applied, a method for manufacturing the electrode, and a manufacturing apparatus. FIG. 13 is a schematic configuration diagram of an electrode manufacturing apparatus. In this embodiment, the structure which apply | coats the insulating material which functions as a spacer to the upper surface of the thin part of an active material layer is added to 1st Embodiment. The same devices as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted or simplified.
　図１３において、本実施形態の電極の製造装置は、保護テープ１３の貼り付け部を備えることに代えて、塗工部３Ａ，５Ａに、活物質を塗布するダイコータ２０の下流に隣接させて絶縁材１４を塗布するダイコータ２８を備える。その他の構成は第１実施形態と同様である。 In FIG. 13, the electrode manufacturing apparatus according to the present embodiment is insulated by providing the coating portions 3 </ b> A and 5 </ b> A adjacent to the downstream of the die coater 20 to which the active material is applied, instead of being provided with the attaching portion of the protective tape 13. A die coater 28 for applying the material 14 is provided. Other configurations are the same as those of the first embodiment.
　塗工部３Ａ，５Ａに設ける絶縁材１４を塗布するダイコータ２８は、そのノズル２８Ａのスリット２８Ｂが電極原反１の幅方向の両側に２カ所設けられる。それぞれのスリット２８Ｂは、図１４に示すように、先行するダイコータ２０により電極原反１に塗布されている活物質層１２の薄肉部１２Ｂと薄肉部１２Ｂの幅方向外側に連なる未塗工領域１１の一部とに対面する幅領域に開口させて形成する。そして、絶縁材１４は、デイスペンサ（液体定量吐出装置）等によりダイコータ２８に精度良く定量供給されて、活物質層１２の薄肉部１２Ｂと薄肉部１２Ｂの幅方向外側領域の一部（図１５）とに、ウェット・オン・ウェットで塗布されて、規定の厚みとなる。 In the die coater 28 for applying the insulating material 14 provided in the coating parts 3A and 5A, two slits 28B of the nozzle 28A are provided on both sides in the width direction of the electrode fabric 1. As shown in FIG. 14, each slit 28 </ b> B has a thin portion 12 </ b> B of the active material layer 12 applied to the electrode fabric 1 by the preceding die coater 20 and an uncoated region 11 that continues to the outside in the width direction of the thin portion 12 </ b> B. An opening is formed in a width region facing a part of the substrate. The insulating material 14 is quantitatively supplied to the die coater 28 with high accuracy by a dispenser (liquid quantitative discharge device) or the like, and the thin portion 12B of the active material layer 12 and a part of the outer region in the width direction of the thin portion 12B (FIG. 15). In addition, it is applied wet-on-wet to a specified thickness.
　絶縁材１４は、ポリイミド、ポリエステル、ポリフッ化ビニリデン等であり、また、絶縁効果を増加させるために、アルミナやタルク等の充填材を混ぜ合わせた樹脂材でもよい。絶縁材１４は、活物質からなる電極スラリーとは組成が異なるため、ウェット・オン・ウェットで塗布しても、活物質と交じり合うことはなく、活物質層１２と絶縁材１４からなる保護層に分離して存在する。図１６は、活物質層１２と絶縁材１４からなる保護層とが塗布された状態を示す。 The insulating material 14 is polyimide, polyester, polyvinylidene fluoride, or the like, and may be a resin material mixed with a filler such as alumina or talc in order to increase the insulating effect. Since the insulating material 14 has a composition different from that of the electrode slurry made of the active material, it does not mix with the active material even when applied wet-on-wet, and the protective layer made of the active material layer 12 and the insulating material 14. It exists separately. FIG. 16 shows a state where the active material layer 12 and the protective layer made of the insulating material 14 are applied.
　活物質層１２と絶縁材１４とが塗布された電極原反１は、乾燥部４により乾燥され、次いで、裏面塗工部５により、同様に、活物質層１２と、絶縁材１４よりなる保護層とが塗布される。そして、活物質層１２と絶縁材１４とが塗布された電極原反１は、裏面乾燥部６により乾燥されて、プレス部８により密度調整され、スリット部９により分離されて巻取り部１０により巻取られる。 The electrode fabric 1 coated with the active material layer 12 and the insulating material 14 is dried by the drying unit 4 and then protected by the back surface coating unit 5 in the same manner as the active material layer 12 and the insulating material 14. A layer is applied. Then, the electrode raw material 1 coated with the active material layer 12 and the insulating material 14 is dried by the back surface drying unit 6, density-adjusted by the press unit 8, separated by the slit unit 9, and separated by the winding unit 10. It is wound up.
　このように、段差により形成した薄肉部１２Ｂと未塗工領域１１の一部とにスペーサとなる絶縁材１４からなる保護層の塗布を行なうことで、更に、簡便に保護層を形成できる。 Thus, the protective layer can be more easily formed by applying the protective layer made of the insulating material 14 serving as a spacer to the thin portion 12B formed by the step and a part of the uncoated region 11.
　本実施形態においては、第１実施形態における効果（ａ）～（ｆ）に加えて以下に記載した効果を奏することができる。 In this embodiment, in addition to the effects (a) to (f) in the first embodiment, the following effects can be achieved.
　（ｇ）第２のダイコータ２８は、電極原反１に塗布された活物質層１２の薄肉部１２Ｂの少なくとも一部と未塗工領域１１の一部とを覆うように、スペーサ部材となる絶縁材１４を塗布する。このため、第２のダイコータ２８を追加するのみで、スペーサ部材となる絶縁材１４を連続して配置することができ、設備をより安価に形成することができる。また、絶縁材１４は、活物質からなる電極スラリーとは組成が異なるため、ウェット・オン・ウェットで塗布しても、活物質と交じり合うことはなく、活物質層１２と保護層に分離して存在することができる。 (G) The second die coater 28 is an insulation serving as a spacer member so as to cover at least a part of the thin part 12B of the active material layer 12 applied to the electrode fabric 1 and a part of the uncoated region 11. The material 14 is applied. For this reason, only by adding the 2nd die coater 28, insulating material 14 used as a spacer member can be arranged continuously, and equipment can be formed more inexpensively. Further, since the insulating material 14 has a composition different from that of the electrode slurry made of the active material, it does not mix with the active material even when applied wet-on-wet, and is separated into the active material layer 12 and the protective layer. Can exist.
　本発明は、以上説明した実施形態に限定されることなく、その技術的思想の範囲内において種々の変形や変更が可能であり、それらも本発明の技術的範囲に含まれることが明白である。 The present invention is not limited to the embodiments described above, and various modifications and changes can be made within the scope of the technical idea, and it is obvious that these are also included in the technical scope of the present invention. .
　２０１２年３月１４日に出願された日本国特許出願２０１２－５７７１５の全内容は引用により本明細書に組み込まれる。 The entire contents of Japanese Patent Application 2012-57715 filed on March 14, 2012 are incorporated herein by reference.

Claims (12)

  1. 　帯状の電極原反の幅方向の少なくとも一端部に長手方向に延びて活物質を塗布しない未塗工領域と、幅方向の残部に前記活物質が長手方向に連続的に塗布された活物質層と、前記未塗工領域と前記活物質層との境界部分を跨いで両者のそれぞれの一部を覆った、絶縁材よりなるスペーサ部材とを長手方向に配置した電極の製造装置において、
    　前記活物質層の前記未塗工領域に隣接する前記スペーサ部材が配置される領域の厚みを、その他の領域の前記活物質層の厚みに対して段差をもって薄肉となるように、前記電極原反に前記活物質を塗布する塗工部と、
    　塗布された前記活物質層の薄肉部の少なくとも一部と前記未塗工領域の一部とを覆って前記スペーサ部材を配置するスペーサ配置部と、を備える電極の製造装置。     An uncoated region extending in the longitudinal direction to at least one end portion in the width direction of the strip-shaped electrode raw material and not coated with the active material, and an active material layer in which the active material is continuously coated in the longitudinal direction on the remaining portion in the width direction And an electrode manufacturing apparatus in which a spacer member made of an insulating material is disposed in the longitudinal direction, covering a part of both of the uncoated region and the active material layer, and covering each part of both.
    The thickness of the region where the spacer member adjacent to the uncoated region of the active material layer is thin with a step with respect to the thickness of the active material layer in the other region. A coating part for applying the active material to
    An apparatus for manufacturing an electrode, comprising: a spacer placement portion that covers at least a part of a thin part of the applied active material layer and a part of the uncoated region, and places the spacer member.
  2. 　前記塗工部は、スリットを有するダイコータにより、前記活物質を含む電極スラリーを前記電極原反に塗布し、
    　前記スリットは、前記スリットの幅方向の両端部で、中央部よりも前記スリットの開口寸法が薄くなる請求項１に記載の電極の製造装置。     The coating portion is coated with the electrode slurry containing the active material on the electrode raw material by a die coater having a slit,
    The electrode manufacturing apparatus according to claim 1, wherein the slit has an opening dimension of the slit that is thinner at both ends in the width direction of the slit than at the center.
  3. 　前記ダイコータの前記スリットの形状は、前記ダイヘッドに挟んだシムの前記開口に臨む形状により構成した請求項２に記載の電極の製造装置。 3. The electrode manufacturing apparatus according to claim 2, wherein the shape of the slit of the die coater is configured to face the opening of the shim sandwiched between the die heads.
  4. 　前記シムは、前記活物質層の薄肉部と前記未塗工領域との境界領域を設定する第１シムと、第１シムに重ねられて前記薄肉部の上面及び前記その他の領域の前記活物質層の幅を設定する第２シムと、を備える請求項３に記載の電極の製造装置。 The shim includes a first shim that sets a boundary region between the thin portion of the active material layer and the uncoated region, and the active material on the upper surface of the thin portion and the other regions that overlaps the first shim. The electrode manufacturing apparatus according to claim 3, further comprising: a second shim that sets the width of the layer.
  5. 　前記スペーサ配置部は、乾燥された前記活物質層若しくは乾燥され且つプレスされた前記活物質層の薄肉部の少なくとも一部と前記未塗工領域の一部とを覆って、前記スペーサ部材としての保護テープを貼付ける請求項１から請求項４のいずれか一つに記載の電極の製造装置。 The spacer arrangement portion covers at least a part of the dried active material layer or a thin part of the dried and pressed active material layer and a part of the uncoated region, and serves as the spacer member. The electrode manufacturing apparatus according to claim 1, wherein a protective tape is attached.
  6. 　前記スペーサ配置部は、前記保護テープを前記活物質層の薄肉部の少なくとも一部と未塗工領域の一部とに押付けるガイドローラを備え、当該ガイドローラはクラウン状の表面を備える請求項５に記載の電極の製造装置。 The spacer arrangement part includes a guide roller that presses the protective tape against at least a part of a thin part of the active material layer and a part of an uncoated region, and the guide roller has a crown-shaped surface. 5. The electrode manufacturing apparatus according to 5.
  7. 　前記電極原反に塗布された前記活物質層の薄肉部の少なくとも一部と前記未塗工領域の一部とを覆うように、前記スペーサ部材となる前記絶縁材を塗布する第２のダイコータを備える請求項２から請求項４のいずれか一つに記載の電極の製造装置。 A second die coater for applying the insulating material to be the spacer member so as to cover at least a part of the thin portion of the active material layer applied to the electrode material and a part of the uncoated region; The electrode manufacturing apparatus according to any one of claims 2 to 4, further comprising:
  8. 　帯状の電極原反の幅方向の少なくとも一端部に長手方向に延びる活物質を塗布しない未塗工領域と、幅方向の残部に前記活物質が長手方向に連続的に塗布された活物質層と、前記未塗工領域と前記活物質層との境界部分を跨いで両者のそれぞれの一部を覆った、絶縁材よりなるスペーサ部材とを長手方向に配置した電極の製造方法において、
    　前記活物質層の前記未塗工領域に隣接する前記スペーサ部材が配置される領域の厚みを、その他の領域の前記活物質層の厚みに対して段差をもって薄肉となるように、前記電極原反に前記活物質を塗布する塗工工程と、
    　塗布された前記活物質層の薄肉部の少なくとも一部と前記未塗工領域の一部とを覆って前記スペーサ部材を配置するスペーサ配置工程と、を備える電極の製造方法。     An uncoated region in which the active material extending in the longitudinal direction is not applied to at least one end in the width direction of the strip-shaped electrode raw material, and an active material layer in which the active material is continuously applied in the longitudinal direction to the remaining portion in the width direction In the method of manufacturing an electrode in which a spacer member made of an insulating material is disposed in the longitudinal direction, covering a part of both of the uncoated region and the active material layer and covering each part of both,
    The thickness of the region where the spacer member adjacent to the uncoated region of the active material layer is thin with a step with respect to the thickness of the active material layer in the other region. A coating step of applying the active material to
    And a spacer arrangement step of arranging the spacer member so as to cover at least a part of the thin part of the applied active material layer and a part of the uncoated region.
  9. 　前記塗工工程は、スリットを有するダイコータにより、前記活物質を含む電極スラリーを前記電極原反に塗布することを含み、
    　前記スリットは、前記スリットの幅方向の両端部で、中央部よりも前記スリットの開口寸法が薄くなる請求項８に記載の電極の製造方法。     The coating step includes applying an electrode slurry containing the active material to the electrode raw fabric by a die coater having a slit,
    The method of manufacturing an electrode according to claim 8, wherein the slit has an opening dimension that is thinner at both ends in the width direction of the slit than at the center.
  10. 　前記スペーサ配置工程は、乾燥された前記活物質層若しくは乾燥され且つプレスされた前記活物質層の薄肉部の少なくとも一部と前記未塗工領域の一部とを覆って、前記スペーサとしての保護テープを貼付けることを含む請求項８または請求項９に記載の電極の製造方法。 The spacer disposing step covers at least a part of the thin portion of the dried active material layer or the dried and pressed active material layer and a part of the uncoated region, and protects the spacer. The manufacturing method of the electrode of Claim 8 or Claim 9 including sticking a tape.
  11. 　前記スペーサ配置工程は、前記電極原反に塗布された前記活物質層の薄肉部の少なくとも一部と前記未塗工領域の一部とを覆うように、第２のダイコータによって前記絶縁材を塗布することを含む請求項８または請求項９に記載の電極の製造方法。 In the spacer arrangement step, the insulating material is applied by a second die coater so as to cover at least a part of the thin part of the active material layer applied to the electrode material and a part of the uncoated region. The manufacturing method of the electrode of Claim 8 or Claim 9 including doing.
  12. 　帯状の電極原反の幅方向の少なくとも一端部に長手方向に延びる活物質を塗布しない未塗工領域と、幅方向の残部に前記活物質が長手方向に連続的に塗布された活物質層と、前記未塗工領域と前記活物質層との境界部分を跨いで両者のそれぞれの一部を覆った、絶縁材よりなるスペーサ部材とを長手方向に配置した電極であって、
    　前記活物質層の前記未塗工領域に隣接する前記スペーサ部材が配置される領域の厚みを、その他の領域の前記活物質層の厚みに対して段差をもって薄肉となるように、前記電極原反に前記活物質を塗布し、
    　塗布された前記活物質層の薄肉部の少なくとも一部と前記未塗工領域の一部とを覆って前記スペーサ部材を配置した電極。     An uncoated region in which the active material extending in the longitudinal direction is not applied to at least one end portion in the width direction of the strip-shaped electrode raw material, and an active material layer in which the active material is continuously applied in the longitudinal direction to the remaining portion in the width direction An electrode in which a spacer member made of an insulating material is disposed in the longitudinal direction and covers a part of each of the uncoated region and the active material layer across a boundary portion;
    The thickness of the region where the spacer member adjacent to the uncoated region of the active material layer is thin with a step with respect to the thickness of the active material layer in the other region. The active material is applied to
    An electrode in which the spacer member is disposed so as to cover at least part of the thin part of the applied active material layer and part of the uncoated region.
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