JP2005096810A - Manufacturing method of electrode plate tape roll - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of an electrode plate tape roll with which a packing member can be disposed of without recovering the member including a wind-up core after the use of the tape roll is finished when a package of the electrode plate tape roll is transported or carried, and an electrode plate does not absorb moisture nor get damaged to prevent degradation in performance of an electrode. <P>SOLUTION: The manufacturing method of the electrode plate tape roll includes steps of: slitting a material roll of the electrode plate tape roll into a constant width, winding up around a wind-up core, attaching flanges to both side faces of the electrode plate tape roll via a cushioning member, fitting a cylindrical part of a core cap from a hole on the flange side, packaging the electrode plate tape roll under gas-filled conditions, and in addition causing the pair of flanges to suspend the electrode plate tape roll in contact with the ground, to prepare the supported package. The core for winding up the electrode plate tape and the wind-up core of the tape roll supported by the package are the same, and after the tape roll is used, the packing member including the wind-up core is disposed of without recovery. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for producing an electrode plate tape roll, and in particular, a positive electrode or negative electrode active material layer is applied to a current collector, and the rolled electrode plate roll is slit into a certain width, Winding on a winding core to make an electrode plate tape roll, storing the tape roll, making a package for storage, transporting and transporting it to the necessary place, winding up after using the tape roll Electrode plate tape that can be discarded without collecting the packing member including the core, and that electrode performance is prevented from deteriorating without absorbing or damaging the electrode plate The present invention relates to a roll manufacturing method.

  In recent years, electronic devices and communication devices have been rapidly reduced in size and weight, and secondary batteries used as driving power sources are also required to be reduced in size and weight. For this reason, non-aqueous electrolyte secondary batteries represented by lithium ion secondary batteries having high energy density and high voltage have been developed in place of conventional alkaline storage batteries.

  For positive and negative electrode plates that greatly affect the performance of the secondary battery, in order to extend the charge / discharge cycle life and to increase the energy density, the electrodes are wound into the battery by thinning the electrode plate. It is important to increase the area of the plate.

  For example, as shown in FIG. 1, the electrode plate includes an active material layer (positive electrode) that releases lithium ions on a current collector such as an aluminum foil or a copper foil, or an active material layer (negative electrode) that adsorbs the ions. ) And a portion where the active material layer is not formed is provided in a pattern as a terminal attachment portion. And this electrode plate is cut | judged in the tape shape of the width | variety according to the size of the battery finally assembled as shown in FIG. 2 along the dotted line of FIG. The interval between the plurality of terminal attachment portions in the electrode plate tape is also determined according to the size of the battery to be finally formed. For example, the flow direction of about 200 to 500 m is required until the battery assembly process. It is a long long tape, wound in a roll shape, and handled in a disk-like state with an outer diameter in the form of a roll of about 20 to 40 cm, for example.

  The electrode plate tape roll is cut into a certain length for both the positive electrode and the negative electrode, and used in the battery assembly process in which the positive electrode and the negative electrode are wound together via a separator and housed in a battery container. However, if the electrode plate absorbs moisture between the production of the electrode plate tape and the completion of the battery assembly, the electrode performance deteriorates or the thickness of the active material layer increases, and the electrode plate is stored inside a battery of a certain size. There is a strict condition that it must not absorb moisture because it cannot be done. In addition to moisture absorption, when the electrode plate is externally collided or stored and transported in the form of a roll, if it is damaged by its own weight near the grounding point of the electrode plate, it will electrically short-circuit and generate heat. Problems are likely to occur. In order to clear the conditions of moisture absorption and damage, the electrode plate tape that has been manufactured in the past is cut to a certain width, and the tape is wound in a roll to be vacuum-dried, leading to an assembly process. The space was stored and transported in a plastic bag or the like with good sealing properties, and the battery was assembled in a dry room.

  In addition to the above-described electrode plate for lithium ion batteries, in an electrode plate for electric double layer capacitors, an electrode plate for fuel cells, etc., as shown in FIG. 3, a long current collector (electrode base) It is an electrode plate provided with an active material layer on one side of the material, and is handled in a state of being continuously wound around a winding core. This electrode plate is cut into a tape shape having a width corresponding to the size of the battery to be finally assembled, as shown in FIG. 4, along the dotted line in FIG. 3, and the active material layer of the current collector is provided. A terminal is attached to the opposite side of the surface.

In the above method, when the electrode plate tape roll is stored and transported, for example, as shown in Patent Document 1, the electrode plate tape roll is fixed and stored in a sealed container provided with a tape outlet. It was. The tape outlet of the sealed container is sealed with a hermetic seal, and the core of the electrode plate tape roll and the side plate of the sealed container are screwed with the side plate stopper of the bolt so that both the inner diameter part of the core and the bolt mesh with each other. Is described as fixing.
JP, 10-69899, A However, when using the above-mentioned airtight container, there is a problem that it takes time to wind up the bolt stopper with respect to the winding core.

  In addition, in the above-mentioned Patent Document 1, it is described that the bolt stopper may be pushed into the inner surface of the winding core without rotating, but in the packing form using the above-described sealed container, it is used once. However, it is an expensive packaging material that is premised on the collection and reuse of packaging materials such as metal cores after being used once. When transporting in the form of rolls, there are many problems that the cost of collecting the packaging members is particularly high. Moreover, the electrode plate accommodated in the airtight container shown in Patent Document 1 is used by being connected to an electrode entraining device by rotating the electrode plate roll while being in the airtight container. .

  An object of the present invention is to apply a positive electrode or negative electrode active material layer to a current collector in a method for producing an electrode plate tape roll, slit the wound electrode plate roll into a certain width, and use it as a winding core. Winding up to produce an electrode plate tape roll, storing the tape roll, making a package for storage, transporting and transporting it to the required place, including the winding core after the tape roll is used The electrode plate tape roll manufacturing method that prevents the electrode performance from deteriorating without collecting the packaging member without being collected and without causing the electrode plate to absorb moisture or damage it. Is to provide.

  The invention described in claim 1 solves the above-described problem, and applies a positive or negative electrode active material layer to a current collector, slits the wound electrode plate tape roll into a certain width, The electrode plate tape roll is manufactured by winding it around the core, and then the cushions are arranged so that the inner peripheral hole of the winding core, the hole of the cushion material, and the hole of the flange are aligned on both sides of the electrode plate tape roll. Attach the flange through the material, fit the cylindrical part from the hole on the flange side with the cylindrical part that fits into each hole and the cylindrical part, and wrap at least the electrode plate tape roll under gas sealing conditions, And, to prevent the electrode plate tape roll from being grounded, by making both of the outer shapes of the pair of flanges larger than the outer shape of the electrode plate tape roll, the pair of flanges are grounded and the electrode plate tape roll is suspended. In the manufacturing method of the electrode plate tape roll for producing the supported packaging body, the core for winding up the slit electrode plate tape and the winding core of the electrode plate tape roll supported by the packaging body are the same, and the tape roll The gist of the manufacturing method of the electrode plate tape roll is that the packaging member including the winding core is not collected after use and is discarded.

  In the method of manufacturing the electrode plate tape roll of the present invention, when fixing the winding core and the flange of the tape roll, there is no need to screw up and use the core cap formed of the cylindrical portion and the flange portion, The portion is fitted into each hole of the flange, cushion material, and winding core, and the cushion material, flange, and winding core are in close contact with each other on both sides of the electrode tape roll. Therefore, the electrode tape roll side surface is protected by the cushion material and the flange on both the left and right side surfaces. Also, both of the outer shapes of the pair of flanges are larger than the outer shape of the electrode plate tape roll. When the pair of flanges are grounded, the electrode plate tape roll is suspended and the electrode plate tape roll is grounded. Not supported. Furthermore, since the electrode plate tape roll is packaged by enclosing gas, it is possible to prevent the electrode performance from deteriorating without absorbing or damaging the electrode plate. Further, in the present invention, the core for winding the slit electrode plate tape and the winding core for the electrode plate tape roll supported by the packing body are the same, and the winding core, cushion material, flange, and core cap are: It is not necessary to use once and collect from the transportation destination, and those packing members can be discarded at the transportation destination, and the total cost including the manufacturing cost and the distribution cost can be reduced.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 5 is a perspective view showing an exploded state of the package of the electrode plate tape roll according to the present invention.

  As each member constituting the package of the electrode plate tape roll, an electrode plate tape roll 1 in which a long electrode plate tape 2 is wound around a winding core 3, a pair of cushion materials 4 and 7, and a pair of flanges 5 and 8. There is a pair of core caps 6 and 9. The flange 5 is attached to the side surface of the electrode plate tape roll 1 via the cushion material 4 so that the inner peripheral hole 14 of the winding core 3, the hole 15 of the cushion material 4, and the hole 16 of the flange 5 are aligned. The core portion 6 including the cylindrical portion 10 and the flange portion 11 fitted in each hole is fitted into the cylindrical portion 10 from the hole 16 on the flange 5 side. Further, the inner side hole 14 of the winding core 3, the hole 17 of the cushion material 7, and the hole 18 of the flange 8 are aligned with the other side surface of the electrode plate tape roll 1 via the cushion material 7. The flange 8 is attached, and the cylindrical portion 12 and the core cap 9 including the flange portion 13 fitted in each hole are fitted into the cylindrical portion 12 from the hole 18 on the flange 8 side.

  Moreover, FIG. 6 is a side view which shows the assembly state of the package body of the electrode plate tape roll based on this invention. FIG. 5 shows a state in which each member constituting an electrode plate tape roll package as shown in FIG. 5 is assembled, and the core cap 6 attaches the flange 5 and the cushion material 4 to the side surface of the electrode plate tape roll 1. Therefore, the cylindrical portion 10 of the core cap 6 has the holes 14, 15, 16 so that the holes 16 of the flange 5, the holes 15 of the cushion material 4, and the inner peripheral holes 14 of the winding core 3 are aligned. Fitted. Similarly, a core cap 9 is used to attach the flange 8 and the cushion material 7 to the other side surface of the electrode plate tape roll 1, and the hole 18 of the flange 8, the hole 17 of the cushion material 7, and the winding core. The cylindrical portion 12 of the core cap 9 is fitted into the holes 14, 17, 18 so that the positions of the three inner peripheral holes 14 are aligned. The outer peripheral surface of the cylindrical portion of the core cap is tapered or partially protruded, and the fitting between the core caps 6 and 9 and each hole increases the adhesion, and is once mounted. After that, make sure that it does not come off easily.

  Further, as shown in FIG. 6, since the outer shapes of the pair of flanges 5 and 8 are both larger than the outer shape of the electrode plate tape roll 1, the pair of flanges 5 and 8 are grounded, and the electrode plate tape roll 1 Is suspended and supported. In addition, it is preferable to increase the outer shape of the pair of cushion materials 4 and 7 with respect to the outer shape of the electrode plate tape roll 1 in order to protect the electrode plate tape roll. Furthermore, the relationship between the size of the pair of flanges and the pair of cushion materials is larger than the outer shape of the electrode plate tape roll, but the outer shape of the flange is made larger than the outer shape of the cushion material or the same size. It is preferable to improve the workability when packaging with a bag. In addition, the flange, cushion material, and core cap used in the present invention are each used as a pair, and the pair is the same in size and material. It is possible to freely combine members without distinguishing left and right by positioning when composing a package by combining each member, and reduce the number of member types and reduce the cost of supplying members Because.

  FIG. 7 is a side view showing a state where the electrode plate tape roll package according to the present invention is packaged in a bag. The electrode plate tape roll has cushions on both sides, and the flange passes the cylindrical portion of the core cap through the hole in the center of each member. In the state where it is grounded and the electrode plate tape roll is suspended and supported, it is wrapped in a bag 19 so as to cover the whole. The bag 19, including the electrode plate tape roll and other members, is housed in the bag. For example, the dry air is dried into the bag and fed, and the bag opening is heat sealed. Adhere and seal. In FIG. 7, the heat seal bonding portion is indicated by 20.

Hereinafter, it explains in full detail for every member which comprises the electrode plate tape roll and the package of the tape roll.
[Electrode plate]
The electrode plate of the present invention is applied to an electrode plate for a lithium ion battery, an electrode plate for an electric double layer capacitor, an electrode plate for a fuel cell, etc. In any case, a long electrode plate tape is wound around a winding core. Have different forms. The electrode for a lithium ion battery will be described in detail below. However, in the case of an electric double layer capacitor, an electrode plate in which the capacitor is provided with an active material layer on a current collector is laminated under a plurality of conditions. The structure is applicable to the electrode plate. Furthermore, in the case of a fuel cell, it is a structure constituted by using an electrode plate in which a current collector is provided with an electrode catalyst layer containing a catalyst necessary for electrode reaction, an electrode active material, etc., and can be applied to the electrode plate. As described above, the electrode plate in which the active material layer is provided on the long (continuous) current collector (electrode base material), and is particularly limited as long as it is continuously wound around the winding core. Not.

  The electrode plate forms an active material layer (positive electrode) that releases ions on the current collector or an active material layer (negative electrode) that adsorbs the ions, and a portion where the active material layer is not formed is patterned. Are provided as terminal mounting portions. As the current collector as the substrate, a metal foil is usually used, an aluminum foil is preferably used as the positive electrode plate, and a copper foil is preferably used as the negative electrode plate. The thickness of these metal foils is usually about 10 to 50 μm.

  An active material coating solution containing at least an active material and a binder is applied to one side or both sides of the current collector, and the coated film is dried to form an active material layer. In order to improve the adhesion between the body and the active material layer, a coupling agent layer may be formed on the surface of the current collector. As the coupling agent, for example, coupling agents such as silane, titanate, and aluminum can be used, and among these, excellent adhesion between the metal foil current collector and the active material layer Select and use.

The active material includes a positive electrode active material and a negative electrode active material. Examples of the positive electrode active material include lithium oxides such as LiCoO ₂ , LiNiO ₂ or LiMn ₂ O ₄ , or TiS ₂ , MnO ₂ , MoO ₃ or V _2. Examples include chalcogen compounds such as O ₅ . These positive electrode active materials may be used alone or in combination of two or more. As the negative electrode active material, for example, a lithium-containing metal such as metallic lithium or a lithium alloy, or a carbonaceous material such as graphite, carbon black, or acetylene black is preferably used. In particular, by using LiCoO ₂ or LiMn ₂ O ₄ as a positive electrode active material and a carbonaceous material as a negative electrode active material, a lithium secondary battery having a high discharge voltage of about 4 volts can be obtained. The positive electrode active material and the negative electrode active material are powders having a particle size in the range of 1 to 100 μm and an average particle size of 5 to 40 μm in order to uniformly disperse these active materials in the active material layer. Preferably there is.

  The binder (binder) is electrochemically stable to the non-aqueous electrolyte, does not elute in the electrolyte, and is a solvent that allows the coating solution to be applied thinly on a current collector made of metal foil. It is necessary to be soluble in water. Examples of the binder include thermoplastic resins, more specifically polyester resins, polyamide resins, polyacrylate resins, polycarbonate resins, polyurethane resins, cellulose resins, polyolefin resins, polyvinyl resins, fluorine resins, or polyimide resins. Etc. can be used. At this time, an acrylate monomer or oligomer into which a reactive functional group has been introduced can be mixed in the binder. In addition, rubber resins, thermosetting resins such as acrylic resins and urethane resins, ionizing radiation curable resins made of acrylate monomers, acrylate oligomers or mixtures thereof, and mixtures of the above various resins may be used. it can.

  The coating liquid contains an appropriately selected active material and binder in a dispersion medium or solvent made of an organic solvent or water such as N-methyl-2-pyrrolidone, toluene, methyl ethyl ketone, or a mixture thereof. It can be prepared by mixing conductive materials as necessary, and mixing and dispersing them with a disperser such as a homogenizer, ball mill, sand mill, roll mill or planetary mixer. When the total coating liquid is 100 parts by mass, the total amount of the active material and the binder is preferably about 40 to 90 parts by mass. In addition, the mixing ratio of the active material and the binder may be the same as the conventional one. For example, in the case of the positive electrode active material, the binder: active material = 0.5: 0.5 to 0.01: 0.99 (mass Ratio) is preferable, and in the case of the negative electrode active material, the binder: active material = 0.5: 0.5 to 0.01: 0.99 (mass ratio) is preferable. As the conductive material, for example, a carbonaceous material such as graphite, carbon black or acetylene black is used as necessary.

  The adjusted coating solutions are gravure coat, gravure reverse coat, roll coat, Mayer bar coat, blade coat, knife coat, air knife coat, slot die coat, slide die coat, dip coat, die coat, comma roll coat, comma reverse coat The active material layer is formed by applying onto a current collector as a substrate and drying by a method such as the above.

Moreover, as the winding core 3 for winding up the electrode plate tape roll, in terms of toughness, light weight, etc., a metallic core such as aluminum, or processed with a molding resin such as polyethylene or polypropylene, or paper It is possible to use a paper tube or the like in which generation of powder or the like is small and moisture content is controlled to be small. However, as a member of the electrode plate tape roll package of the present invention, it is intended to be disposable one-way, and general-purpose synthetic resins and paper tubes are preferably used.
[Cushion material]
As the cushion material 4, generally used are sponge, foamed urethane, glass wool, foamed rubber and the like. The cushion material protects the side surface of the electrode plate tape roll from being damaged by friction, impact, or the like without the electrode plate tape roll and the flange being in direct contact with each other. In addition, it is preferable to select a material from which the powder or the like does not fall from the cushion material in the state of being handled and packed together with the electrode plate tape roll. This is because when foreign matter such as powder adheres to the electrode plate, the performance of the electrode plate is deteriorated.

The size of the cushion material is preferably the same for each pair, and is equal to or larger than the size of the outer shape of the side surface of the electrode plate tape roll 1 so as to cover the entire side surface of the electrode plate tape roll. The shape of the cushion material is not limited to the circular shape as shown in FIG. 5, and the shape of the cushion material is not limited as long as it covers the entire side surface of the electrode plate tape roll.
[Flange]
As the flange 5, those processed by a molding resin such as polyethylene or polypropylene can be used in terms of toughness, light weight and the like. In particular, a lightweight, high-rigidity polypropylene resin such as Sumpli Plastic's trade name Sunply, in which a plurality of ribs are interposed between a pair of thin thermoplastic resin plates arranged in parallel. It is preferred to use some material. As described above, it is preferable that the resin itself has toughness, and a space (gap) is provided through the rib, and the thermoplastic resin to be used is preferably foamed, thereby further reducing the weight of the flange. it can.

It is preferable that the pair of flanges have the same size. Both the outer shapes of the pair of flanges cover the entire side surface of the electrode plate tape roll through a cushioning material and prevent the electrode plate tape roll from grounding. In both cases, by making it larger than the outer shape of the side surface of the electrode plate tape roll, the pair of flanges are grounded to suspend and support the electrode plate tape roll. Further, the shape of the flange is not limited to a square as shown in FIG. 5, and the shape of the flange is not limited as long as the above function can be exhibited.
[Core cap]
As the core cap 6, a core cap processed with a molding resin such as polyethylene or polypropylene can be used in terms of toughness and lightness.

  The core cap is composed of the main part of the cylindrical part and the collar part, and the outer peripheral surface of the cylindrical part is given a taper shape or a partial protrusion shape, so that the core cap, the flange, the cushion material, and the winding It is necessary to increase the close contact of each core hole. For example, FIG. 8 is a schematic view schematically illustrating that the core cap 9 is fitted into the circumferential hole 14 of the winding core 3 around which the electrode plate tape 2 is wound, and will be described based on this. . However, the cushion material and the flange are actually interposed between the core cap and the electrode plate tape roll in order to make the explanation easy to understand and not to complicate the drawing, but are not shown.

  On the outer peripheral surface of the cylindrical portion 12 of the core cap 9, illustrated horizontal ribs 21 are formed at equal intervals on the cylindrical portion 12, and two ring-shaped ribs 22 are formed on the cylindrical portion 12. . When the diameter a of the circumferential hole 14 of the winding core 3 is compared with the diameter b of the distal end portion of the cylindrical portion 12 of the core cap 9, the relation of a> b is established, and the diameter of the circumferential hole of the winding core 3 is It is preferable that the distance (outer diameter) between a and the rib 24 facing the rib 21 in the circumferential direction is the same or about 0.05 mm to 0.1 mm and the diameter a is larger. Thereby, it is easy to attach the cylindrical portion 12 to the winding core 3, and the adhesion between them is good.

  Further, a taper shape is provided at a position where the cylindrical portion 12 and the flange portion 13 of the core cap 9 are in contact with each other, and the diameter c of the root portion of the cylindrical portion 12 is larger than the diameter a of the circumferential hole 14 of the winding core 3. If it enlarges about 0.05-0.5 mm, the fitting with the core cap 9 and the winding core 3 will become strong, and once it fits, it will not come off easily.

  This is because the shape of the taper 23 extends from the tip of the cylindrical portion 12 of the core cap 9 to the tip of the horizontal rib 21 so that the cylindrical portion 12 can easily enter the circumferential hole 14 of the winding core 3. .

Further, the tip of the rib 21 can be tapered so that the resistance force when the rib 21 is inserted into the circumferential hole 14 of the winding core 3 can be slightly reduced. The rib 21 can be formed with a height of about 0.05 mm to 1 mm. Further, the ring-shaped rib 22 prevents the core cap 9 from being easily detached from the cylindrical hole 14 of the winding core 3 during handling and transportation after the core cap 9 is attached to the cylindrical hole 14 of the winding core 3. The function of the stopper can be demonstrated. However, the height of the ring-shaped rib 22 should be lower than the height of the rib 21 in order to facilitate the work when the core 3 for winding the core cap 9 is fitted into the cylindrical hole 14. Is desirable.
[Packaging bag]
In the electrode plate tape roll package of the present invention, at least the electrode plate tape roll is packaged by enclosing gas. The material used for the packaging is in the form of a bag. When used, it is desirable to use a bag having a predetermined size and one side opened and the remaining three sides sealed. However, the packaging bag is not limited to the three-side seal method, and a pillow method, a gusset method, a tetrapack method, a stand pouch method, or the like can also be adopted.

  What constitutes the packaging bag 19 is preferably a laminate in which a metal or metal foil such as aluminum is deposited on a base material and a heat sealable resin layer is further provided thereon. . Thereby, the thing excellent in the gas-barrier property with respect to the humid outside air etc. is obtained.

  As a base material constituting the laminated material of the packaging bag, for example, it has excellent properties in mechanical, physical, chemical, etc., in particular, it is strong and strong, and has heat resistance. Resin films or sheets can be used. Specifically, stretching of strong resin such as polyester resin, polyamide resin, polyaramid resin, polyolefin resin, polycarbonate resin, polystyrene resin, polyacetal resin, fluorine resin (uniaxial or biaxial) Or an unstretched film thru | or sheet | seat can be mentioned. The thickness of the substrate is 5 to 100 μm, preferably about 10 to 50 μm.

  In addition, the metal foil and metal vapor deposition layer constituting the laminated material are laminated with a base metal foil such as aluminum, iron, copper, nickel, etc., or a metal such as aluminum, titanium, silicon, or a metal oxide thereof is used. And a vapor deposition layer can also be provided on a base material. The thickness of the said metal foil or metal vapor deposition layer is about 0.05 micrometer-15 micrometers.

  In the laminated material of the packaging bag, a heat-sealable resin layer is provided on the metal foil or metal vapor deposition layer provided on the base material. Examples of the heat-sealable resin used for the heat-sealable resin layer include resins that can be melted by heat and fused to each other. Specifically, low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear) low density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene -Methacrylic acid copolymer, ethylene-methyl methacrylate copolymer, ethylene-propylene copolymer, methylpentene polymer, polybutene polymer, polyolefin resin such as polyethylene or polypropylene, acrylic acid, methacrylic acid, maleic acid, maleic anhydride An acid-modified polyolefin resin modified with an unsaturated carboxylic acid such as acid, fumaric acid, itaconic acid, polyvinyl acetate resin, poly (meth) acrylic resin, polyvinyl chloride resin, or the like can be used. The heat sealable resin layer may be formed by applying the heat sealable resin as described above, or may be formed by laminating a film or sheet made of the heat sealable resin as described above. The thickness of such a heat-sealable resin layer can be set within a range of 5 to 300 μm, preferably 10 to 100 μm.

  The thickness of the packaging bag which consists of the above laminated materials is about 20-500 micrometers.

  This packaging bag, including the electrode plate tape roll and other members, is stored, for example, in a reduced pressure environment, dry air (dry air) or inert gas such as nitrogen is put in the bag. The inside of the bag is replaced with gas by the supplied gas, and the opening of the bag is brought into contact with the heat-sealable resin layers, combined, heated and bonded, and sealed. The electrode plate tape roll stored in the packaging bag is sealed with a gas containing no moisture or a very small amount of moisture containing a negligible amount of moisture in the packaging bag. And other changes over time can be prevented.

  However, it is not assumed that the above gas replacement in the bag is performed in an environment under reduced pressure conditions. The original air that was present in the bag is filled with the gas to be replaced under normal atmospheric pressure conditions. Can also be discharged. If gas replacement is performed under reduced pressure conditions or vacuum conditions, the replacement rate of gas replacement increases, and changes with time due to moisture absorption or the like can be prevented with higher accuracy.

  Separately from the above bag replacement by gas replacement, store desiccant such as quick lime and silica gel with hygroscopicity in a packaging bag, or use the bag replacement by gas replacement and the method of using the above desiccant together can do. This combined method is preferable because the moisture in the bag can be further reduced.

  As mentioned above, the electrode plate tape roll is sealed with gas in the packaging bag, and it is possible to transport the packaged form as it is. It is preferable to store two or more pieces in a corrugated cardboard or tape them on the corrugated cardboard so that the quality of the electrode plate tape roll does not deteriorate due to vibration or impact during transportation. However, even if the electrode plate tape roll package in the present invention is externally packaged such as cardboard, the electrode plate tape roll is not grounded during storage or transportation, and the suspended state can always be maintained. This is important, and it is possible to prevent the electrode performance from being lowered without causing damage.

Further, in the above, a pair of cushioning material, a pair of flanges, and a pair of core caps are used for one of the electrode plate tape rolls made of a long electrode plate tape wound around the winding core, Although it has been described that the packaging body is configured, for example, two or more electrode plate tape rolls are adjacent to each other through a cushioning material, and a plurality of flanges and a pair of core caps are used at both ends. The electrode plate tape roll can be supported and suspended. However, the cylindrical portion of the core cap to be used needs to be long so that a plurality of electrode plate tape rolls can be supported. A plurality of electrode plate tape rolls including a pair of flanges at both ends can be stored in a single packaging bag.
(Method for producing electrode plate tape roll)
The manufacturing method of the electrode plate tape roll of this invention consists of the following processes.
1. A positive electrode or negative electrode active material layer is applied to the current collector, a wide electrode plate tape is formed into a long shape, and wound up to obtain an electrode plate tape roll original.
2. The above wound electrode plate tape roll is slit into a certain width with a slitter and wound on a winding core to produce an electrode plate tape roll.
3. Next, on both sides of the electrode plate tape roll, a flange is attached via a cushion material so that the inner peripheral hole of the winding core, the hole of the cushion material, and the hole of the flange are aligned, and fitted in each hole. A core cap consisting of a cylindrical portion and a flange portion to be fitted is fitted into the cylindrical portion through the hole on the flange side, and at least a pair of electrode plate tape rolls are packaged under gas-filled conditions and the electrode plate tape rolls are not grounded. By making both the outer shapes of the flanges larger than the outer shape of the electrode plate tape roll, the pair of flanges are grounded, and the electrode plate tape roll is suspended to produce a supported package.

  In the electrode plate tape roll manufactured by the above process, the core for winding the slit electrode plate tape is the same as the core for winding the electrode plate tape roll supported by the package, and the non-aqueous electrolyte is used for transportation and transportation. In the production of the secondary battery, after the use of the tape roll, the packaging member including the winding core is discarded at the transportation destination without being collected at the transportation source.

  Conventionally, the winding core is made of metal or the like, and an expensive packaging member that is supposed to be collected and reused is used. However, in the present invention, a slit electrode plate tape is wound. The core to be raised and the core for winding the electrode plate tape roll supported by the packing body are the same, and there is no rewinding process of the electrode plate tape roll between the slit process and the assembly process of the packing body. As it is, it is sent to the assembly process of the package. The packing member including the winding core is relatively cheaper than the conventional packaging member and is disposable at the transportation destination without being collected at the transportation source.

  In addition, since packing members such as metal winding cores are expensive in the past, they are collected at the transportation source, and the collected members are not used as they are. , Wasted and reused. However, in the present invention, the winding core is the same as the core for winding the slit electrode plate tape and the winding core for the electrode plate tape roll supported by the packing body, and the core is collected at the transportation source. Without being done, it can be disposable at the transportation destination, and the total cost can be reduced including the manufacturing cost and the distribution cost of the electrode plate tape roll and its package.

  Next, an Example and a comparative example are given and this invention is further explained in full detail.

An electrode plate tape roll (packaging body) as shown in FIGS. 5 and 6 was produced by the following manufacturing method.
(Production of electrode plate tape)
As materials for the electrode plate coating liquid, 85 parts by mass of activated carbon powder, 7 parts by mass of conductive material, 5 parts by mass of SBR (styrene-butadiene rubber) resin, 3 parts by mass of CMC (carboxymethylcellulose), water as a dispersion medium Was mixed at a mixing ratio of 300 parts by mass and stirred and mixed with a planetary mixer (manufactured by Kodaira Seisakusho Co., Ltd.) for 30 minutes to obtain a coating liquid containing a slurry-like active material.

  Using the coating solution obtained above, a coating solution was applied as shown in FIG. 3 using a die coater on an etching aluminum foil current collector having a thickness of 20 μm and a width of 300 mm. Then, it dried at 140 degreeC for 10 minute (s), formed the coating film on the etching aluminum foil, and slitted with the slitter machine. The coating film containing the active material thus obtained was aged in a vacuum oven at 80 ° C. for 48 hours to remove moisture, thereby producing an electrode plate for a capacitor. However, this electrode plate is 56 mm wide and long and continuous, and is wound up on a polypropylene core.

  As a cushion material, prepare a pair of foamed urethane foams with a thickness of 3 mm as shown in FIG. 5 (with a hole in the center), and flanges as a product of Sumika Plastics's product name Sunply HP50120 polypropylene. A hollow sheet made of resin was cut into a square as shown in FIG. 5 and a hole was formed in the center to prepare a pair of sheets. Further, a pair of core caps were prepared by injection molding with polypropylene resin in the shape as shown in FIG.

  The inner peripheral hole of the winding core, the hole of the cushion material, and the hole of the flange are aligned with both side surfaces of the electrode plate tape roll obtained by winding the long electrode plate tape on the winding core obtained above. As described above, the flange is attached through the cushion material, and the core portion including the cylindrical portion and the flange portion fitted in each hole is fitted into the cylindrical portion from the hole on the flange side, and the pair of cushion material, flange, and core cap The whole electrode plate tape roll is housed in a three-sided sealing type packaging bag made of a polypropylene resin layer (50 μm) / aluminum layer (5 μm) / polyethylene resin layer (50 μm), under an environment of reduced pressure, The dry air is sufficiently fed into the bag, and the gas inside the bag is replaced by the fed gas, so that the opening of the bag is the same as the polypropylene resin layer of the heat-sealable resin layer. Contact, together, heated and allowed to adhere and seal the packaging bag. Then, the pair of flanges were grounded, and the electrode plate tape roll was suspended and supported.

  5 units of the above electrode plate tape roll package are manufactured under the same conditions, the 5 units are arranged so that the flanges are adjacent to each other, and stored in one cardboard case, and finally a vinyl chloride tape on the outside of the cardboard case. And taped. However, the electrode plate tape rolls were stored and transported so that the electrode plate tape rolls housed in the cardboard cases were not grounded and kept suspended. When the above packing body was opened at the transportation destination and the electrode plate tape roll was observed, there was no damage or winding, and there was no deterioration in electrode performance. Further, in the above manufacturing method, the core for winding the slit electrode plate tape and the winding core for the electrode plate tape roll supported by the packing body are the same, and the winding core, cushion material, flange, core cap Since there is no need to use them once and collect them from the transportation destination, the packaging members can be discarded at the transportation destination, and the total cost including manufacturing cost and distribution cost can be reduced.

(Preparation of positive electrode plate tape)
As materials for the positive electrode coating liquid, 90 parts by mass of LiCoO ₂ powder having an average particle diameter of 10 μm having a particle diameter of 1 to 100 μm, 5.0 parts by mass of graphite powder as a conductive material, and polyvinylidene fluoride resin as a binder (Neofluon VDF, manufactured by VP-850 Daikin Industries, Ltd.) was used at a blending ratio of 5 parts by mass and 50 parts by mass of N-methylpyrrolidone. Among these materials, polyvinylidene fluoride was dissolved in N-methylpyrrolidone to prepare a varnish in advance, and after putting other powder materials into the obtained varnish, a planetary mixer (manufactured by Kodaira Seisakusho) ) For 30 minutes to obtain a positive electrode coating liquid containing a slurry-like positive electrode active material.

  Using the positive electrode coating solution obtained above, a positive electrode active material coating was applied on a current collector made of an aluminum foil having a thickness of 15 μm and a width of 300 mm with a die coater so as to form a pattern as shown in FIG. The liquid was applied. Then, after drying at 140 ° C. for 10 minutes, a coating film is formed on the aluminum foil, and further pressed with a roll press machine at a linear pressure of 1 t / cm, then slit with a slitter machine, and made of polypropylene. It was wound up on a winding core. Further, the coating film containing the positive electrode active material obtained above was aged in a vacuum oven at 80 ° C. for 48 hours to remove moisture, and a positive electrode plate tape roll was produced. However, this electrode plate tape roll is 56 mm wide and long continuous winding.

  As a cushion material, prepare a pair of foamed urethane foams with a thickness of 3 mm as shown in FIG. 5 (with a hole in the center), and flanges as a product of Sumika Plastics's product name Sunply HP50120 polypropylene. A hollow sheet made of resin was cut into a square as shown in FIG. 5 and a hole was formed in the center to prepare a pair of sheets. Further, a pair of core caps were prepared by injection molding with polypropylene resin in the shape as shown in FIG.

  Positions of the inner peripheral hole of the winding core, the hole of the cushion material, and the hole of the flange on the both side surfaces of the electrode plate tape roll obtained by winding the long electrode plate tape on the winding core obtained above A flange is attached via a cushioning material so that the two parts fit together, and the cylindrical part is fitted into the hole from the flange side with the cylindrical cap and the flange part fitted into each hole, and a pair of cushioning material, flange, core The entire cap and electrode plate tape roll are housed in a three-sided sealing type packaging bag consisting of a polypropylene resin layer (50 μm) / aluminum layer (5 μm) / polyethylene resin layer (50 μm), under an environment under reduced pressure conditions. Then, the dry air is sufficiently fed into the bag, the inside of the bag is replaced with gas by the fed gas, and the opening of the bag is made of polypropylene of the heat-sealable resin layer. Contacting the emissions resin layers, combined, heated to adhere and seal the packaging bag. Then, the pair of flanges were grounded, and the electrode plate tape roll was suspended and supported.

  5 units of the above electrode plate tape roll package are manufactured under the same conditions, the 5 units are arranged so that the flanges are adjacent to each other, and stored in one cardboard case, and finally a vinyl chloride tape on the outside of the cardboard case. And taped. However, the electrode plate tape rolls were stored and transported so that the electrode plate tape rolls housed in the cardboard cases were not grounded and kept suspended. When the above packing body was opened at the transportation destination and the electrode plate tape roll was observed, there was no damage or winding, and there was no deterioration in electrode performance. Further, in the above manufacturing method, the core for winding the slit electrode plate tape and the winding core for the electrode plate tape roll supported by the packing body are the same, and the winding core, cushion material, flange, core cap Since there is no need to use them once and collect them from the transportation destination, the packaging members can be discarded at the transportation destination, and the total cost including manufacturing cost and distribution cost can be reduced.

An electrode plate tape roll (packaging body) as shown in FIGS. 5 and 6 was produced by the following manufacturing method.
(Preparation of negative electrode plate tape)
As a material for the negative electrode coating liquid, 90 parts by mass of graphite powder, 10 parts by mass of polyvinylidene fluoride resin (neoflon VDF, VP-850 manufactured by Daikin Industries, Ltd.), and 80 parts by mass of N-methylpyrrolidone as a dispersion medium Using the mixing ratio, the powder was dispersed using the same disperser and dispersion method as in the case of producing the positive electrode coating liquid, to obtain a slurry-like negative electrode coating liquid.

  Using the negative electrode coating liquid obtained above and using a die coater on a rolled copper foil current collector having a thickness of 12 μm and a width of 300 mm, a negative electrode coating liquid is formed so as to have a pattern as shown in FIG. Coating was performed. After that, it is dried at 140 ° C. for 10 minutes to form a coating film on the copper foil, and then roll-pressed with a roll press machine at a linear pressure of 0.5 t / m and then slit with a slitter machine. And wound on a polypropylene winding core. Further, moisture was removed by the same method as in the formation of the positive electrode plate to prepare an electrode plate tape roll for negative electrode. However, this electrode plate tape roll is a continuous winding which is 57.5 mm in width and long.

  Prepare the above electrode plate tape roll and a pair of cushioning material, flange, and core cap under the same conditions as in Example 2, and the same packaging bag used in Example 2, with the same gas replacement and sealing Thus, a packaged package was produced. Then, the pair of flanges were grounded, and the electrode plate tape roll was suspended and supported.

  5 units of the above-mentioned electrode plate tape roll package are produced under the same conditions, and the 5 units are arranged so that the flanges are adjacent to each other and stored in one cardboard case as in Example 2, and finally the cardboard The outside of the case was taped with a vinyl chloride tape. However, the electrode plate tape rolls were stored and transported so that the electrode plate tape rolls housed in the cardboard cases were not grounded and kept suspended.

  When the above packing body was opened at the transportation destination and the electrode plate tape roll was observed, there was no damage or winding, and there was no deterioration in electrode performance. Further, in the above manufacturing method, the core for winding the slit electrode plate tape and the winding core for the electrode plate tape roll supported by the packing body are the same, and the winding core, cushion material, flange, core cap Since there is no need to use them once and collect them from the transportation destination, the packaging members can be discarded at the transportation destination, and the total cost including manufacturing cost and distribution cost can be reduced.

It is the schematic explaining the electrode plate illustratively. It is the schematic explaining the electrode plate cut | judged in the tape shape schematically. It is the schematic explaining the electrode plate illustratively. It is the schematic explaining the electrode plate cut | judged in the tape shape schematically. It is a perspective view which shows the decomposition | disassembly state of the package of the electrode plate tape roll which concerns on this invention. It is a side view which shows the assembly state of the package of the electrode plate tape roll which concerns on this invention. It is a side view which shows the state by which the electrode plate tape roll package which concerns on this invention was packaged with the bag. It is the schematic which illustrates that a core cap is fitted by the circumferential hole of the winding core which wound up the electrode plate tape.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electrode plate tape roll 2 Electrode plate tape 3 Winding core 4 Cushioning material 5 Flange 6 Core cap 7 Cushioning material 8 Flange 9 Core cap 10 Cylindrical part 11 Girder part 12 Cylindrical part 13 Girder part 14 Circumferential hole (core for hoisting)
15 Cushion Material Hole 16 Flange Hole 17 Cushion Material Hole 18 Flange Hole 19 Packaging Bag 20 Adhesive Portion 21 Rib 22 Rib 23 Taper 24 Rib

Claims (1)

A positive electrode or negative electrode active material layer is applied to the current collector, the wound electrode plate tape roll original is slit to a certain width, and wound on a winding core to produce an electrode plate tape roll, and then the electrode plate At the both sides of the tape roll, a flange is attached through the cushion material so that the inner peripheral hole of the winding core, the hole of the cushion material, and the hole of the flange are aligned, Fit the cylindrical cap through the hole on the flange side of the core cap consisting of the flange, and package at least the electrode plate tape roll under gas-filled conditions, and prevent the electrode plate tape roll from grounding. Both of the electrode plate tape rolls are made larger than the outer shape of the electrode plate tape roll, so that the pair of flanges are grounded and the electrode plate tape roll is suspended to produce a supported package. In the method, the core for winding the slit electrode plate tape and the winding core for the electrode plate tape roll supported by the packing body are the same, and after using the tape roll, the packing member including the winding core is recovered. Without manufacturing, it is disposable, The manufacturing method of the electrode plate tape roll characterized by the above-mentioned.

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