JP2005255225A - Tape roll pack and production method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tape roll pack and a production method thereof for easily packing a tape roll item, for preventing moisture and damage during storage, and for throwing away a packing member away after use. <P>SOLUTION: As to an electrode plate roll 2 having metal core 31 which has a length sufficiently longer than the width of a tape roll item of an electrode plate tape, or the like, a pair of cushioning members are made contact with both side faces of the roll 2 to be covered with a cylindrical packaging material 19 which is a cylindrically formed bag sufficiently bigger than the width of the roll 2 and contains a metal layer or a metal oxide layer. The excess part of the material 19 is made to fit along the side face of the roll 2, or a sleeve part 39 is formed by heat sealing so that the metal core 31 go through. The formed sleeve part 39 seals the excessive metal core part with a sealing tape 41 containing metal for sealing airtight by either one of dry air packaging, vacuum packaging or inert gas flush packaging and/or desiccant enclosing packaging. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a package for tape rolls such as electrode plate rolls for storage and / or distribution, and more specifically, the work process for storing and packing the tape rolls is simple, and the tape rolls can be stored and During logistics work, prevent moisture absorption and damage of tape-like materials, prevent performance degradation, and collect packaging materials that make up the packaging after use of tape rolls is finished. It is related with the packaging body of a tape roll which can be disposable, and its manufacturing method.

In the present specification, “ratio”, “part”, “%” and the like indicating the composition are based on mass unless otherwise specified, and the “/” mark indicates that they are integrally laminated.
“PET” is “polyethylene terephthalate”, “ON” is “biaxially stretched polyamide film”, “LLDPE” is “linear low density polyethylene”, “LDPE” is “low density polyethylene”, and “EVA” Is an abbreviation, functional expression, common name, or industry term for “ethylene-vinyl acetate copolymer”.

(Background Art) In recent years, electronic devices and communication devices are rapidly becoming smaller and lighter, and secondary batteries used as power sources for driving these devices are also required to be smaller and lighter. . 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.
Then, 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. 2, along the dotted line in FIG. In this specification, it is referred to as “electrode plate tape”, and the interval between the plurality of terminal mounting portions in the electrode plate tape is also determined according to the size of the battery finally formed. As described above, since there are a plurality of types of electrode plate tapes and narrow widths, normally, a narrow width electrode plate tape is manufactured in a wide width including a plurality of rows and then cut into a tape shape having a desired width. . The state before the cutting is referred to as an electrode plate roll (a person skilled in the art is referred to as a jumbo roll), including one wound with a wide electrode plate tape. Is cut off. What wound up the cut electrode plate tape is called an electrode plate tape roll. The cut electrode plate tape reaches the battery assembly process.
The electrode plate roll before cutting is, for example, a roll having a length in the flow direction of about 100 to 3000 m, a width of about 100 to 1000 mm, and a wound outer diameter of about 15 to 100 cm. The roll-like material is referred to as an “electrode plate roll” in the present specification, and includes the electrode plate roll and a wide electrode plate tape roll, and unless otherwise specified, both the positive electrode plate and the negative electrode plate roll and the electrode plate. It also includes tape rolls.
The electrode plate roll is cut to a certain length for both the positive electrode and the negative electrode to form a positive electrode plate tape and a negative electrode plate tape. In the battery assembly process, the positive electrode plate tape and the negative electrode plate tape are wound together via a separator. However, when the electrode plate absorbs moisture between the production of the electrode plate tape and the completion of the battery assembly, the electrode performance decreases or the thickness of the active material layer increases. However, since the electrode plate cannot be stored inside a battery of a certain size, there is a strict condition that it must not absorb moisture. Further, in recent years, the electrode plate manufacturing process and the battery assembly process may be performed at different locations for cost reduction. In such a case, not only the moisture absorption of the electrode tape roll or electrode roll, but also when the electrode plate is stored or transported in an external collision or standing in the form of a roll, damage due to its own weight is caused near the grounding point of the electrode plate. If this occurs, problems such as electrical short-circuiting and heat generation are likely to occur.
Therefore, the packaging of the electrode plate roll has a simple work process for storing and packing the electrode plate roll, and the electrode plate tape can absorb moisture and be damaged during the storage and / or distribution work. Therefore, after the use of the electrode plate roll is finished, it is required to be disposable without collecting the packing member constituting the packing body.
In addition, for example, a polarizing film, a retardation film, a light diffusing film, a low reflection film, a lens film, a color filter, or the like such as a polarizing film used for a liquid crystal display panel is wound around a long (continuous) object on a core. For tape rolls, exactly the same packaging is required.

(Prior Art) Conventionally, an electrode plate roll package is used in which an electrode plate roll is housed in a sealed container, and the electrode plate roll is rotated out of the sealed container and directly connected to an electrode entraining device. There is. When storing and / or distributing the electrode plate roll, the electrode plate tape roll is fixed and stored in a sealed container provided with a tape outlet, and the tape outlet of the sealed container is sealed with a hermetic seal, Further, it is known that the winding core of the electrode plate tape roll and the side plate of the sealed container are fixed by a side plate stopper of the bolt, and by screwing in which both the inner diameter portion of the winding core and the bolt are engaged (for example, Patent Documents). 1).
However, the bolting method has a problem in that packing work such as winding a stopper around a winding core and tightening the bolt is complicated, and requires time and effort. In addition, it is described that the bolt stopper may be pushed into the inner surface of the core without rotating, but in the packing form using the above-mentioned sealed container, it is discarded only once. Rather, it is an expensive packaging material that is assumed to be collected and reused after it has been used once, especially when transported overseas in the form of electrode tape roll packaging There is also a problem that the cost of collecting the members increases. In addition, there is a drawback that the tape outlet of the sealed container is not sufficiently sealed, easily absorbs moisture during storage, and battery performance may be deteriorated.
Moreover, it is simply packaged for each electrode plate tape roll, and a pair of electrode plates on the both side surfaces of the electrode plate roll, each of which includes a winding core and an electrode plate tape wound around the winding core. A cushion material and a flange are contacted in this order, and a cylindrical portion of a pair of core caps from the outside of each flange is provided in a hole provided in a substantially central portion of the flange, a hole provided in a substantially central portion of the cushion material, and a core The cylindrical portion and the flange portion constituting the pair of core caps are sequentially fitted into the holes, and are fixed and packed from both sides, and the minimum outer dimension of the pair of flanges is smaller than the maximum outer dimension of the electrode plate roll. A packaging material comprising a metal layer or a metal oxide layer, wherein the electrode plate roll is not grounded and a pair of flanges are grounded to suspend and support the electrode plate tape roll, and the entire packaging includes a metal layer or a metal oxide layer And dry air Instrumentation, vacuum packaging, inert gas exchange packaging, and / or desiccant method of sealing the packaging with either sealed packaging has also been proposed, in terms of individual packaging, poor takes a long time efficiency.
In order to increase efficiency, there has been a method of fixing the opening of the packaged packaging material in a drawstring shape with a squeezing tape or core cap as a packaging method for packaging and packaging in units of electrode plate rolls. When a large-diameter electrode plate roll is used for moisture-proof packaging, there is a problem in that moisture resistance is secured by a gap narrowed in a purse-like shape or a pinhole generated at that time.
Furthermore, if there is a packaging material between the apparatus for suspending the metal core and the electrode plate roll, there is a problem that the packaging material is rubbed by the weight of the electrode plate roll and vibration during transportation, thereby impairing moisture resistance.

Japanese Patent Laid-Open No. 10-69899

  Accordingly, the present invention has been made to solve such problems. The purpose is to form the cuffs so that only the metal core passes through the openings along both side surfaces of the electrode plate roll or using heat seal in the operation of storing and packing the electrode plate roll, Folding and gathering packaging materials in a purse-like shape is minimized, and it is secured with a formed cuff and a metal-containing sealing tape, ensuring moisture resistance easily. Since the sealing tape is wound on the electrode plate roll side from the suspension fulcrum, the weight of the electrode plate roll is not applied to the packaging material, and vibration during transportation is not applied to the packaging material. During storage and / or logistics work of the electrode plate roll, it prevents moisture absorption or damage of the electrode plate roll, prevents the electrode performance from deteriorating, and after the use of the electrode plate roll is finished, packaging Make up body Without recovering the packaging member is to provide packaging body of the electrode plate roll which can be disposable, and a method of manufacturing the same.

In order to solve the above problems, a tape roll package according to the invention of claim 1 is a metal core and a tape roll formed by winding a long tape-like material around the metal core. In a tape roll whose length of the winding core is sufficiently larger than the width of the tape roll, a pair of cushion materials are brought into contact with both side surfaces of the tape roll, and the tape roll and the pair of cushion materials are attached to the tape roll. Cover with a packaging material containing a metal layer or metal oxide layer formed into a cylindrical shape sufficiently larger than the width, and the portion of the packaging material that is longer than the width of the tape roll is the side surface of the tape roll Along with, to the metal core portion that is sufficiently longer than the width of the tape roll, sealed with a sealing tape containing metal, dry air packaging, vacuum packaging, inert gas replacement packaging, And / or desiccant packaging As formed by a sealed package with or deviation, it is obtained by.
The packaging body of the electrode plate roll according to the invention of claim 2 is the packaging body of the tape roll according to claim 1, wherein the tape roll is an electrode plate roll formed by winding up the electrode plate tape. It is.
According to a third aspect of the present invention, there is provided a packaging body for an electrode plate roll, wherein at least one of the cylindrical packaging materials is formed with a cuff portion through which a metal core penetrates by a heat sealing method, and the cuff portion is formed as the electrode. The metal core part that is sufficiently longer than the width of the plate roll is sealed with a sealing tape containing metal.
The electrode roll roll package according to the invention of claim 4 is the electrode roll package according to any one of claims 1 to 3, wherein the suspension fulcrum of the suspension device for suspending the electrode roll package is In order to prevent the weight of the electrode plate roll from being applied to the packaging material and the sealing tape, the extra length of the metal core provided outside the sealing tape is used.
The method for manufacturing a tape roll package according to the invention of claim 5 is the method for manufacturing a tape roll package according to claim 1, wherein: (a) a metal core 31 having a tape sufficiently larger than the width of the tape is used. (B) a pair of cushion materials are brought into contact with both side surfaces of the tape roll, and (c) the tape roll and the pair of cushion materials are sufficiently larger than the width of the tape roll. Cover with a packaging material containing a metal layer or metal oxide layer formed into a large cylindrical shape, and (d) cuffs so that the metal core penetrates at least one of the cylindrical packaging material by a heat seal method And (e) the cuff is sealed with a metal-containing sealing tape to a metal core portion that is sufficiently longer than the width of the tape roll.

According to the first aspect of the present invention, since the tape roll is hermetically sealed during the storage and / or physical distribution operation of the tape roll, it is possible to prevent moisture absorption and performance deterioration, and dry air. Since packaging, decompression packaging, inert gas replacement packaging, and / or desiccant-enclosed packaging desiccant are used, moisture-proofness can be easily secured even with inexpensive packaging materials that do not depend on moisture permeability. There is no need to use and collect from the transportation destination, and those packaging members can be discarded, and a tape roll packaging body is provided that can reduce the total cost including manufacturing cost and distribution cost. .
According to the second aspect of the present invention, since the electrode plate roll is hermetically sealed during the storage and / or distribution work of the electrode plate roll, it is possible to prevent the electrode plate from absorbing moisture or deteriorating the electrode performance. In addition, since dry air packaging, reduced pressure packaging, inert gas replacement packaging, and / or desiccant encapsulated packaging desiccant are used, moisture resistance can be easily secured even with inexpensive packaging materials that do not depend on moisture permeability. In addition, the electrode plate roll that can be used once and does not need to be collected from the transport destination and can discard those packing members, and can reduce the total cost including manufacturing cost and distribution cost. A package is provided.
According to this invention of Claim 3, in the operation | work which accommodates and packs this electrode plate roll, a cuff is formed so that only a metal core may pass through an opening using a heat seal, and it is a packaging material in a purse-like shape Moisture proofing can be easily ensured by eliminating folds and twists caused by gathering together as much as possible, and fixing with cuffs and a sealing tape containing metal. Moreover, the packaging body of the electrode plate roll which can also reduce the effort which carries out individual packaging like an electrode plate tape is provided.
According to the fourth aspect of the present invention, there is no packaging material at the fulcrum between the metal core and the electrode plate roll suspension, preventing vibration during transportation and damage to the packaging material due to the weight of the electrode plate roll. An electrode plate roll package that can be provided is provided.
According to the present invention of claim 5, since a flat packaging material can be easily sealed and packaged, a method for manufacturing a tape roll packaging body that is excellent in moisture resistance and can reduce packaging costs is provided. The

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic diagram schematically illustrating an electrode plate.
FIG. 2 is a schematic view schematically illustrating an electrode plate cut into a tape shape.
FIG. 3 is a perspective view of a cylindrical packaging material used in the present invention.
FIG. 4 is a cross-sectional view illustrating loading and sealing according to the present invention.
FIG. 5 is a cross-sectional view of sealing using a binding band showing a comparative example.

(Invention of product) The package of the electrode plate roll of the present invention is shown in FIG. The electrode plate tape 2 is wound around a metal core 31 that is sufficiently larger than the width of the electrode plate roll 2. The electrode plate tape 2 wound around the electrode plate roll 1 may be in one or a plurality of rows. A pair of cushion materials 4 and 7 are brought into contact with both side surfaces of the electrode plate roll 1, and the electrode plate roll 1 and the pair of cushion materials 4 and 7 are covered with a packaging material 19. As shown in FIGS. 3 (A) and 4 (A), the packaging material 19 is formed into a cylindrical shape that is sufficiently larger than the width of the electrode plate roll 1, and is a metal layer or metal oxide layer. It is set as the packaging material 19 containing.
A portion of the packaging material 19 that is longer than the width of the electrode plate roll 1 along the side surface of the electrode plate roll 1 and has a length that is sufficiently larger than the width of the electrode plate roll 1 The core part is sealed with a sealing tape 41 containing metal. What is necessary is just to carry out hermetic packaging in any of dry air packaging, reduced pressure packaging, inert gas substitution packaging, and / or desiccant enclosure packaging at the time of this sealing.
Preferably, as shown in FIG. 3 (B), at least one of the portions of the packaging material 19 that is longer than the width of the electrode plate roll 1 is provided with a metal core 31 by a heat sealing method. A cuff portion 39 that penetrates is formed, and the cuff portion 39 is sealed with a metal tape portion that is sufficiently longer than the width of the electrode plate roll with a sealing tape containing metal. Preferably, as shown in FIG. 3B, the suspension fulcrum of the suspension device for suspending the package of the electrode roll 1 is an extra length portion of the metal core provided outside the sealing tape.

  In the above description, the electrode plate roll 1 is described as a representative example of the tape roll. However, the present invention is not limited to the electrode plate roll 1 and may be a tape roll wound with a long tape-like material. As the long tape-like material, a relatively thin film or sheet-like material in which a layer affected by a gas such as humidity or oxygen can be applied. For example, a polarizing film used for a liquid crystal display panel, A retardation film, a light diffusion film, a low reflection film, a lens film, a color filter, and the like. Any tape roll in which a long (continuous) material is wound around a core in the form of a film or sheet may be used, and it is preferably used for storage or logistics between processes. In this specification, an electrode plate roll will be described, but a tape roll can be applied in exactly the same manner.

  (Invention of Method) The method for producing an electrode plate roll package of the present invention comprises: (a) winding an electrode plate tape onto a metal core 31 sufficiently larger than the width of the electrode plate tape; ) A pair of cushion materials are brought into contact with both side surfaces of the electrode plate roll, and (c) the electrode plate roll and the pair of cushion materials are formed into a cylindrical shape sufficiently larger than the width of the electrode plate roll. (D) forming a cuff portion so that the metal core penetrates at least one of the cylindrical packaging materials by a heat seal method, and (d) e) The cuff is sealed with a metal-containing sealing tape to a metal core part that is sufficiently longer than the width of the electrode plate roll.

Hereinafter, it explains in full detail for every member which comprises the packing body of an electrode plate roll.
(Electrode plate) The electrode plate used in the present invention has a form in which a long electrode plate tape is wound around a winding core. 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.

  (Current Collector) 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.

(Active material) 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. Examples thereof include chalcogen compounds such as ₃ or V ₂ 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.

  (Binder) The binder (binder) is electrochemically stable with respect to the non-aqueous electrolyte, does not elute in the electrolyte, and can be applied thinly on a current collector made of metal foil. It must be soluble in some solvent. 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.

  (Coating) A coating liquid is prepared by combining an active material and a binder selected appropriately in a dispersion medium or solvent composed of an organic solvent or water such as N-methyl-2-pyrrolidone, toluene, methyl ethyl ketone, or a mixture thereof. In addition, a conductive material can be further mixed if necessary, and mixed and dispersed by 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.

  In addition, as the winding core 3 for winding 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 dust Etc., and a paper tube or the like that is controlled to contain less moisture can be used. However, as a member of the electrode plate tape roll packaging body of the present invention, it is intended to be disposable in one way, and general-purpose synthetic resins and paper tubes are preferable.

(Cushion material) As the cushion material 4, generally, sponge, foamed urethane, glass wool, foamed rubber or the like can be used. 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. 3, 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.

  The materials used for these cores, cushioning materials, and flanges are, for example, workability, heat resistance, weather resistance, mechanical properties, dimensional stability, antioxidant properties, slipperiness, and releasability as required. For the purpose of improving and modifying flame retardancy, antifungal properties, electrical properties, strength, etc., for example, lubricants, plasticizers, fillers, antistatic agents, antiblocking agents, crosslinking agents, antioxidants UV absorbers, light stabilizers, colorants such as dyes and pigments, and the like can be used, and a modifying resin can also be used.

  (Packaging material) In the electrode plate roll package of the present invention, at least the electrode plate roll is hermetically packaged, and the hermetic package is one of dry air packaging, reduced pressure packaging, inert gas replacement packaging, and / or desiccant-encapsulated packaging. Or a combination. The material used in the packaging is preferably a cylindrical bag that has a predetermined size and two opposite sides that are open, and the rest are sealed. Not limited to this, it is also possible to adopt an envelope pasting method, a gusset method, a tetrapack method, a stand pouch method, or the like.

The packaging material 19 constituting the packaging bag uses a laminated material in which a thin film layer or metal foil such as a metal oxide or aluminum is laminated on a base material, and a heat-sealable resin layer is further provided thereon. It is preferable. Thereby, the thing excellent in the 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. A thin film layer can also be provided on the substrate by vacuum deposition, sputtering, CVD, or the like. 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. In this case, the packaging material 19 preferably has a water vapor transmission rate of about 1.0 g / m ² day or less, preferably 0.5 g / m ² day or less, more preferably 0.1 g / m, based on JIS-K7129. ² days or less. When the moisture permeability of the packaging material 19 is high, combined use with a desiccant is preferable.
In this packaging bag, the electrode plate tape roll and other members are also stored. For example, dry air (dry air) or inert gas such as carbon dioxide or nitrogen in an environment under reduced pressure. 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 and an inexpensive packaging material that does not depend on the magnitude of moisture permeability can be used. In this case, a packaging material selected from moisture permeability may be used depending on the storage and distribution period and the environment such as temperature and humidity.

  As described above, the electrode plate roll is sealed with gas in the packaging bag, and it is possible to transport the packaged form as it is. However, what is packaged in the bag is one of the electrode plate rolls, 2 It is preferable to store more than the number in a cardboard or tape the cardboard so that the quality of the electrode plate roll does not deteriorate with respect to vibration or impact during transportation. However, it is important that the electrode plate roll package in the present invention is maintained in a suspended state without the grounding of the electrode plate roll during storage or transportation even when the cardboard is packaged outside. It is possible to prevent the electrode performance from being lowered without causing damage or the like.

  Moreover, the length of the metal core 31 used for the package body of the electrode plate roll of the present invention is made sufficiently long. That is, the extra length part of the metal core is configured so that the suspension fulcrum of the suspension device to be suspended is outside the sealing tape so that the weight of the electrode plate roll is not applied to the packaging material and the sealing tape. That's fine. By doing in this way, there is no packaging material between the device that suspends the metal core and the electrode plate roll, so the wrinkles, twisting of the packaging material due to the weight of the electrode plate roll and the external force and vibration during transportation, There is no rubbing, and the moisture resistance due to pinholes, cracks and breakage is not impaired, and the quality is maintained for a long time.

  (Invention of Method) The method for producing the package of the electrode plate roll of the present invention will be described.

First, (a) an electrode plate tape is wound on a metal core 31 sufficiently larger than the width of the electrode plate tape to form an electrode plate roll.
Next, (b) a pair of cushion materials are brought into contact with both side surfaces of the electrode plate roll.
Next, (c) the electrode plate roll and the pair of cushion materials are covered with a packaging material. The packaging material has a cylindrical shape covering the electrode plate roll and sufficiently larger than its width.

  And (d) A cuff part is formed so that a metal core may penetrate at least one of this cylindrical packing material by the heat seal method. The cuff portion may be formed after covering the electrode plate roll. However, as shown in FIG. 3B, one side may be formed in advance by a heat sealing method in the state of a cylindrical packaging material. The cuff portion may be formed manually or by using a dedicated jig, and a known heat seal method such as a hot plate seal, impulse seal or high frequency seal can be applied. The shape of the cuff portion is such that the metal core 31 can be inserted and is preferably smaller.

(E) The cuff is sealed with a metal-containing sealing tape to a metal core portion that is sufficiently longer than the width of the electrode plate roll. What is necessary is just to seal so that the sealing tape 41 may cover both the cuff part 39 and the metal winding core 31, and you may seal by at least 1 layer or multiple turns.
As the sealing tape 41, a known pressure-sensitive adhesive tape comprising at least a metal such as aluminum or copper and a pressure-sensitive adhesive layer may be used. In addition, the part of the packaging material 19 that is excessively long may be a length that reaches the metal core 31 along the electrode plate roll and the cushion material.
By configuring in this way, the electrode plate roll is hermetically sealed so that the packaging material 19 having excellent moisture permeability and the metal core 31 having substantially zero moisture permeability are not made into a purse-like shape as much as possible. It is difficult to receive, and the storage stability can be remarkably improved.

  Further, in the steps (d) and (e), the packaging material 19 having a large extra length without forming the cuff portion is closely packed on the metal core 31 by chrysanthemum folds along the electrode plate roll and the cushion material. After folding, the packaging material 19 and the metal core 31 may be sealed with the sealing tape 41. However, as compared with the method of forming the cuff portion, defects such as pinholes are likely to occur in the folded portion, and therefore it should be performed carefully.

  FIG. 5 shows a comparative example in which the wrapping material is not formed into a cuff shape by heat sealing as shown in FIG. The excessively long packaging material 19 is folded or twisted into a purse-like shape and opened in a fan shape, so that the sealing is insufficient.

The electrode plate roll used for the packaging body of the present invention includes an electrode plate roll and a wide electrode plate tape roll, and is not limited to the electrode plate roll for lithium ion batteries, and is an electrode for an electric double layer capacitor. An electrode plate with an active material layer provided on one or both sides of a long (continuous) current collector (electrode substrate), such as a plate or a fuel cell electrode plate, and a winding core (core) The present invention can be applied to a device that is handled in a wound state wound continuously.
In addition, even with a narrow electrode plate tape roll, there is no problem in storage stability such as moisture resistance, impact resistance, and discardability, and the packing work requires many work because the number of packing is large, but compared with the conventional method Then, packing efficiency can be remarkably improved.
Further, as a tape roll, for example, a tape roll wound with a long tape-like material such as a polarizing film, a retardation film, a light diffusion film, a low reflection film, a lens film, a color filter, etc. used in a liquid crystal display panel If it is.

Next, an Example and a comparative example are given and this invention is explained in full detail.
(Package of positive electrode plate roll) As a material of 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 and 5.0 parts by mass of graphite powder as a conductive material Polyvinylidene fluoride resin (neoflon VDF, manufactured by VP-850 Daikin Industries, Ltd.) was used as a binder 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 liquid 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 600 mm with a die coater so as to form a pattern as shown in FIG. The solution is applied, dried at 140 ° C. to form a coating film on the aluminum foil, and further pressed with a roll press machine at a linear pressure of 1 t / cm. The length is 800 mm and the wall thickness is 7 mm. It wound up on the aluminum core, and obtained the positive electrode plate roll which consists of a plurality of rows of positive electrode plate tapes.
A pair of cushion materials are brought into contact with both side surfaces of the positive electrode plate roll, and the whole is made up of PET film (thickness 12 μm) / aluminum layer (thickness 9 μm) / ON film (thickness 30 μm) / LLDPE (thickness). 80 μm), which is stored in an envelope seal type cylindrical packaging material, and the cuffs as shown in FIG. 3 (B) are formed by heat sealing the excess length portions on both sides of the cylindrical packaging material. The cuff part was sealed with an aluminum foil (thickness 50 μm) / acrylic adhesive (thickness 50 μm) sealing tape to obtain a package of positive electrode plate rolls. In the sealing, the dry air was sufficiently fed into the packaging bag, and the inside of the bag was replaced with gas by the fed gas.

(Packaging body of negative electrode plate roll) As a material of 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.), as a dispersion medium Using N-methylpyrrolidone at a blending ratio of 80 parts by mass, the powder was dispersed using the same disperser and dispersion method as in the case of preparing the positive electrode coating liquid, to obtain a slurry-like negative electrode coating liquid.
Using the negative electrode coating liquid obtained above, using a die coater on a rolled copper foil current collector having a thickness of 12 μm and a width of 600 mm, a negative electrode coating liquid is formed so as to have a pattern as shown in FIG. And dried at 140 ° C. 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. The film was wound around an aluminum core having a thickness of 7 mm to obtain a negative electrode plate roll comprising a plurality of rows of negative electrode plate tapes.
Other than using the negative electrode plate roll and using PET film (thickness 12 μm) / LDPPE (thickness 15 μm) / aluminum layer (thickness 7 μm) / EVA (vinyl acetate component 5%) (thickness 100 μm) as a packaging material. In the same manner as in Example 1, a negative electrode plate roll package was obtained.

  (Inert gas replacement packaging) An electrode plate roll package was obtained in the same manner as in Example 1 except that nitrogen gas was used instead of dry air.

  (Inert gas replacement packaging) An electrode plate roll package was obtained in the same manner as in Example 2 except that nitrogen gas was used instead of dry air.

  (Metal oxide packaging material + desiccant packaging) PET (thickness 12 μm) / silicon oxide (thickness 500 nm, film formation by CVD method) / ON film (thickness 25 μm) / EVA (vinyl acetate component) 5%, thickness 100 μm), and a desiccant sachet having 250 g of silica gel was enclosed during packaging in the same manner as in Example 1 to obtain an electrode plate roll package.

  (Drying agent-enclosed packaging) PET (thickness 12 μm) / silicon oxide (thickness 200 nm, film formation by CVD method) / ON film (thickness 25 μm) / LLDPE (thickness 80 μm) as a packaging bag, 500 g of silica gel A package of electrode plate rolls was obtained in the same manner as in Example 2 except that the desiccant pouch having the above was enclosed at the time of packaging.

  (Vapor deposition packaging material + desiccant packaging) PET (thickness 12 μm) / aluminum (thickness 0.5 μm, film formation by vacuum deposition) / linear low density polyethylene (thickness 100 μm) as packaging bag In the same manner as in Example 5, an electrode plate roll package was obtained.

  (Vapor deposition packaging material + inert gas replacement packaging) An electrode plate roll package was obtained in the same manner as in Example 7 except that nitrogen gas was used instead of dry air.

  (Comparative Example 1) (Bundling rubber) Heat sealing does not form the opening of the packaging material into a cuff shape as shown in FIG. 3B, but instead of the sealing tape, the binding material is formed in a purse-like shape. Was used in the same manner as in Example 5 except that sealing was performed as shown in FIG.

  (Comparative Example 2) (Supporting portion) A packaging body for the electrode plate roll was obtained in the same manner as in Example 5 except that the packaging material was present in the supporting portion of the suspension of the electrode plate roll.

(Comparative example 3) (Individual packaging of electrode plate tape roll) As a material of 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 and graphite powder as a conductive material As a binder, 5.0 parts by mass of polyvinylidene fluoride resin (neoflon VDF, manufactured by VP-850 Daikin Industries, Ltd.) was used as a binder at a mixing 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 liquid 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 600 mm with a die coater so as to form a pattern as shown in FIG. The solution was applied, dried at 140 ° C. to form a coating film on the aluminum foil, and further pressed with a roll press machine at a linear pressure of 1 t / cm and slitted with a slitter machine. Furthermore, 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, thereby obtaining a positive electrode plate tape roll. However, this electrode plate has a width of 56 mm and is long and continuous, and is wound up on a polypropylene core.
As a cushion material, a pair of 3 mm thick foams made of urethane foam (having a hole in the center) are prepared, and as a flange, a hollow structure made of Sumitomo Plastics' product name Sunply HP50120 made of polypropylene resin is used. The sheet was cut into a square and a hole was made in the center to prepare a pair of sheets. Furthermore, a pair of core caps were prepared by injection molding with polypropylene resin.
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 roll obtained by winding the long electrode plate tape on the winding core obtained above. A flange is attached through a cushion material, and the above-mentioned core cap consisting of a cylindrical portion and a flange portion fitted into each hole is fitted into the cylindrical portion from the hole on the flange side, and a pair of cushion material, flange, core cap and electrode The whole board tape roll is housed in a three-side sealed packaging bag made of a polypropylene resin layer (50 μm) / aluminum layer (7 μm) / polyethylene resin layer (80 μm), and under an environment under reduced pressure, The dry air is sufficiently sent into the bag, the inside of the bag is replaced with gas by the supplied gas, and the opening portion of the bag is brought into contact with and joined to the polypropylene resin layers of the heat-sealable resin layer. Thereby, heated adhered and sealed packaging bag.

(Evaluation) Evaluation was carried out by a transportation test, disposal property, packaging efficiency, and high temperature and humidity test.
In the transport test, in Examples 1 to 7, the electrode plate roll package is supported at both ends of the metal core by a pair of flanges, and this electrode plate roll package is stored in one cardboard case. Tape the outside of the cardboard case with vinyl chloride tape and transport it by truck for 500 km, then open the package, observe the electrode plate roll and the packaging material, there is no damage or winding, A sample that was not damaged and did not deteriorate in electrode performance was regarded as acceptable.
The discardability was determined to be acceptable when the packaging material mainly composed of the core, the cushion material, the flange, and the cardboard used can be discarded without being collected.
In the high temperature and high humidity test, the electrode plate roll package with the thermohygrometer enclosed is left in a constant temperature and humidity chamber at 40 ° C. and 90% RH for 40 days. The one without was considered acceptable.
About packing efficiency, the electrode plate for 80,000 cells was packed in the case of Example 5 and the case of the comparative example 3, and the required time was compared.

(Evaluation results) In Examples 1 to 7, the transportation test, the disposal property, and the high temperature and high humidity test were all passed. In Comparative Example 1, suspension, transportation test, and disposal were acceptable, but in the high-temperature and high-humidity test, the internal humidity of the electrode plate roll package increased to the same level as the external environment. there were. In Comparative Example 2, the packaging material was rubbed by the support portion of the electrode plate roll due to vibration during transportation, which was unacceptable. Comparative Example 3 passed the high-temperature and high-humidity test, but the packaging efficiency required about 20 times as long as Example 5. The packaging efficiency of Example 5 is remarkably good, and other examples are estimated to have similar packaging efficiency.
The moisture permeability is 0.1 g / m ² day or less in Examples 1 to 4, 0.5 g / m ² day in Example 5, 1.0 g / m ² day in Example 6, and Examples 7 and 8 In this case, it was 0.5 g / m ² day.

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 of the cylindrical packaging material used for this invention. It is sectional drawing explaining the loading and sealing of this invention. It is sectional drawing of sealing using the binding band which shows a comparative example.

Explanation of symbols

2: Electrode plate rolls 4, 7: Cushion material 19: Packaging material 20: Seal part 31: Metal core 39: Cuff part 41: Sealing tape 43: Bundling rubber

Claims (5)

A metal roll and a tape roll formed by winding a long tape-like material around the metal roll, wherein the length of the metal roll is sufficiently larger than the width of the tape roll, and both sides of the tape roll A package comprising a metal layer or a metal oxide layer, wherein a pair of cushion materials are brought into contact with a surface, and the tape roll and the pair of cushion materials are formed into a cylindrical shape sufficiently larger than the width of the tape roll. A metal core portion that is covered with a material and that has a portion that is longer than the width of the tape roll of the packaging material along the side of the tape roll and that is longer than the width of the tape roll. The tape roll is sealed with a metal-containing sealing tape and hermetically packaged in any of dry air packaging, reduced pressure packaging, inert gas replacement packaging, and / or desiccant-encapsulated packaging. Packing body. The packaging body of the tape roll of Claim 1 WHEREIN: The said tape roll is an electrode board roll formed by winding up an electrode board tape, The packaging body of the electrode board roll characterized by the above-mentioned. A metal winding in which at least one of the cylindrical packaging materials is formed with a cuff part through which a metal core penetrates by a heat seal method, and the cuff part is sufficiently longer than the width of the electrode plate roll. 3. The electrode plate roll packaging body according to claim 1, wherein the core portion is sealed with a sealing tape containing metal. The package body of the electrode roll according to any one of claims 1 to 3, wherein a suspension fulcrum of a suspension device for suspending the package body of the electrode roll is not loaded on the packaging material and the sealing tape by the weight of the electrode plate roll. Thus, it is set as the extra length part of the metal core provided in the outer side of the said sealing tape, The package body of the electrode roll characterized by the above-mentioned. In the manufacturing method of the tape roll packaging body according to claim 1, (a) the tape is wound on a metal core 31 sufficiently larger than the width of the tape, and (b) on both side surfaces of the tape roll. A metal layer or metal oxide layer formed by making a pair of cushion materials abut, and (c) forming the tape roll and the pair of cushion materials into a cylindrical shape sufficiently larger than the width of the tape roll. (D) forming a cuff portion so that the metal core penetrates at least one of the cylindrical packaging material by a heat seal method, and (e) forming the cuff portion into the width of the tape roll. A method of manufacturing a tape roll package, comprising sealing a metal core portion that is sufficiently larger and longer with a sealing tape containing metal.

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