Packing material for lithium ion secondary battery pack, lithium ion secondary battery pack packed material, and manufacturing method of lithium ion secondary battery pack packed material

Abstract

To provide a packing material for a lithium ion secondary battery pack, which is a sewn product of a heat-resistant cloth, is less likely to cause a seam opening, can be manufactured under excellent workability, and can exhibit high fire resistance.SOLUTION: A packing material for a lithium ion secondary battery pack is comprised by a sewn product of a heat-resistant cloth having a surface coated with a resin composition of 25 g / m2 to 115 g / m2. The resin composition preferably contains one or more resins selected from a fluorine resin, an acrylic resin, a polyethylene resin, a polyethylene oxide (PEO) resin, a polypropylene (PP) resin, an ethylene vinyl acetate (EVA) resin, a various rubber resin, a silicone resin, a polyvinyl chloride (PVC) resin, and a urethane resin, and the heat-resistant cloth is preferably a glass cloth, a silica cloth, or an alumina cloth.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a packaging material for a lithium ion secondary battery pack, a packaged lithium ion secondary battery pack, and a method for manufacturing the packaged lithium ion secondary battery pack. [Background technology]

[0002] BACKGROUND ART Conventionally, electric vehicles that run using an electric motor and hybrid vehicles that run using both an engine and an electric motor are equipped with a power storage module (battery assembly) as a drive source for the electric motor. In the energy storage module, a plurality of energy storage elements (secondary battery cells) having positive and negative electrode terminals are arranged, and the electrode terminals of adjacent secondary battery cells are connected by a bus bar to form a secondary battery cell string in which a plurality of secondary battery cells are connected in series. Multiple secondary battery cell strings are arranged as needed depending on output, etc.

[0003] Furthermore, a busbar module (connection module) that holds the busbars is typically attached to the top of the row of secondary battery cells that make up the energy storage module, and a typical busbar module is fitted with a connection module cover to insulate and protect the connection between the busbar and the electrode terminal (see, for example, Patent Document 1).

[0004] In an automotive battery system, one or more of the above-mentioned storage modules are placed and connected in a case, and the system is operated in the form of a battery pack, which is equipped with a protection circuit to prevent overcharging, over-discharging, or overheating of the storage module, a BMS (battery management system) to monitor voltage and temperature, a charge / discharge circuit, a cooling mechanism, etc.

[0005] If the battery pack is a lithium-ion secondary battery pack, it contains an organic electrolyte that falls under the category of Class 4, Category 2 petroleum, hazardous materials under the Fire Service Act. Therefore, when storing (stocking) the battery pack, it is required to use a designated hazardous materials warehouse or a general warehouse after taking the required fire-resistant measures. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2019-125474 Summary of the Invention [Problem to be solved by the invention]

[0007] When storing lithium-ion secondary battery packs in a general warehouse, it is possible to store multiple battery packs in a metal box. However, this not only becomes bulky when there are only a small number of lithium-ion secondary battery packs to be stored, but also increases the storage costs because the metal box must be fire-resistant, and it is difficult to dispose of the battery packs after a certain period of use.

[0008] For this reason, when storing the lithium ion secondary battery packs in a general warehouse, a method of covering the lithium ion secondary battery packs with a fire-resistant cloth is being considered.

[0009] However, after investigations by the present inventors, it was found that when a heat-resistant cloth such as silica cloth was used as a fabric material with fire resistance and this heat-resistant cloth was sewn to produce packaging material for lithium-ion secondary battery packs, the heat-resistant cloth would easily unravel, causing the inorganic fibers to come loose and powder to fall off, making the seams (joints) of the resulting packaging material prone to opening, and the heat-resistant cloth was inherently hard and inflexible, resulting in poor processability.

[0010] In order to solve the above technical problems, a method has been devised in which a heat-resistant cloth having a surface coated with a resin composition is used and then sewn. However, the fire-resistant cloth material used to package lithium-ion secondary battery packs must have enough fire resistance to prevent flames from breaking out on the opposite side (unheated side) when heated to 945°C for one hour. However, no resin composition has been found that exhibits fire resistance under these conditions, making it difficult to use heat-resistant cloth coated with a resin composition on the surface as the cloth material for packaging the battery packs.

[0011] In light of these circumstances, the present invention aims to provide a packaging material for lithium-ion secondary battery packs that, despite being a sewn product of heat-resistant cloth, is less likely to have openings at the seams, can be manufactured with excellent processability, and exhibits high fire resistance, as well as to provide a lithium-ion secondary battery pack package and a method for manufacturing the lithium-ion secondary battery pack package. [Means for solving the problem]

[0012] In order to achieve the above object, the present inventors have conducted extensive research and have found that 25~115g / m 2 The present inventors have found that the above technical problems can be solved by a packaging material for lithium ion secondary battery packs, which is made of a sewn heat-resistant cloth coated with the above resin composition, and have completed the present invention based on this finding.

[0013] That is, the present invention is (1) Surface: 25 to 115 g / m 2 a packaging material for a lithium ion secondary battery pack, comprising a sewn product of a heat-resistant cloth coated with the resin composition of the above-mentioned formula (1); (2) The packaging material for a lithium-ion secondary battery pack according to (1) above, wherein the resin composition contains one or more resins selected from fluorine-based resins, acrylic-based resins, polyethylene-based resins, polyethylene oxide (PEO) resins, polypropylene (PP) resins, ethylene vinyl acetate (EVA) resins, rubber-based resins, silicone-based resins, polyvinyl chloride (PVC) resins, and urethane-based resins. (3) The packaging material for a lithium ion secondary battery pack according to (1) or (2) above, wherein the heat-resistant cloth is a glass cloth, a silica cloth, or an alumina cloth. (4) When the heat-resistant cloth is heat-treated at a temperature of 1000°C for 1 hour, (Dimensions before heating - dimensions after heating) ÷ (Dimensions before heating) × 100 The packaging material for a lithium ion secondary battery pack according to any one of (1) to (3) above, wherein the shrinkage rate represented by the formula (1) is 0 to 10%. (5) A lithium ion secondary battery pack package, characterized in that the lithium ion secondary battery pack is packaged in the packaging material for lithium ion secondary battery packs according to any one of (1) to (4) above. (6) The lithium ion secondary battery pack package according to (5) above, in which a load of lithium ion secondary battery packs placed on a pallet is packaged in the packaging material for lithium ion secondary battery packs according to any one of (1) to (4) above. (7) A method for manufacturing the lithium ion secondary battery pack package described in (6) above, With the lithium ion secondary battery pack placed on the pallet, the pallet is lifted, and then The packaging material for a lithium ion secondary battery pack according to any one of (1) to (4) above is pulled under the pallet, and then, The load on the pallet with the lithium ion secondary batteries placed thereon is packed in the packaging material for lithium ion secondary battery packs. A method for manufacturing a lithium ion secondary battery pack package (hereinafter, appropriately referred to as method 1 for manufacturing a lithium ion secondary battery pack package according to the present invention), (8) A method for manufacturing the lithium ion secondary battery pack package described in (6) above, A load in which lithium ion secondary batteries are placed on a pallet is placed on the packaging material for lithium ion secondary battery packs described in any one of (1) to (4) above, and then The lithium ion secondary battery pack packaging material is used to pack a load of lithium ion secondary batteries placed on the pallet. A method for manufacturing a lithium ion secondary battery pack package characterized by the above (hereinafter referred to as "method 2 for manufacturing a lithium ion secondary battery pack package according to the present invention") This provides: [Effects of the Invention]

[0014] According to the present invention, by using a heat-resistant cloth whose surface is coated with a resin composition as a constituent material of packaging material for lithium-ion secondary battery packs, it is possible to suppress the shedding of inorganic fibers and powder falling off from the heat-resistant cloth, thereby suppressing the opening of seams, and also to impart flexibility to the heat-resistant cloth, thereby providing excellent processability. Furthermore, according to the present invention, by controlling the amount of resin composition coated on the surface of the heat-resistant cloth within a predetermined range, the coated resin composition is carbonized and then decomposed under high-temperature heating, thereby making it possible to suitably suppress the occurrence of flames on the surface of the heat-resistant cloth. Therefore, according to the present invention, it is possible to provide a packaging material for lithium-ion secondary battery packs that is sewn from heat-resistant cloth but is less likely to have gaps at the seams, can be manufactured with excellent processability, and exhibits high fire resistance, and it is also possible to provide a lithium-ion secondary battery pack package and a method for manufacturing a lithium-ion secondary battery pack package. [Brief explanation of the drawings]

[0015] [Figure 1] 1A to 1C are diagrams illustrating an example of a usage form of the packaging material for lithium-ion secondary battery packs according to the present invention. [Figure 2]This is a diagram illustrating another example of use of the lithium ion secondary battery pack packaging material of the present invention, and shows a schematic cross-sectional view of an example of use in which a lithium ion secondary battery pack 2 is packaged using the lithium ion secondary battery pack packaging material 1 of the present invention. [Figure 3] FIG. 1 is a diagram for explaining a method for manufacturing a lithium ion secondary battery pack package according to the present invention, and shows a cross-sectional schematic diagram of the products obtained in each manufacturing process for manufacturing a lithium ion secondary battery pack package according to the present invention. [Figure 4] FIG. 1 is a diagram for explaining a method for manufacturing a lithium ion secondary battery pack package according to the present invention, and shows a cross-sectional schematic diagram of the products obtained in each manufacturing process for manufacturing a lithium ion secondary battery pack package according to the present invention. [Figure 5] FIG. 10 is a diagram presenting photographs showing various states in a fire resistance test in an example of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0016] First, the packaging material for a lithium ion secondary battery pack according to the present invention will be described. The packaging material for a lithium-ion secondary battery pack according to the present invention has a surface area of ​​25 to 115 g / m 2 The present invention is characterized in that the garment is made of a heat-resistant cloth sewn product coated with the resin composition of the above.

[0017] In the packaging material for a lithium ion secondary battery pack according to the present invention, the heat-resistant cloth refers to a sheet-like material formed by weaving various inorganic fibers. Examples of heat-resistant cloth include glass cloth (a sheet-like material formed by weaving glass fibers), silica cloth (a sheet-like material formed by weaving silica fibers), and alumina cloth (a sheet-like material formed by weaving alumina fibers).

[0018] The heat-resistant cloth is preferably a silica cloth, and the silica cloth is preferably a high-purity silica cloth. In the present application, the high-purity silica cloth is preferably one made of silica fibers having a silica (SiO2) content of 60 to 100% by mass, more preferably one made of silica fibers having a silica (SiO2) content of 90 to 100% by mass, and even more preferably one made of silica fibers having a silica (SiO2) content of 96 to 100% by mass. When the heat-resistant cloth is a high-purity silica cloth, the heat resistance can be easily improved.

[0019] The high purity silica cloth can be produced, for example, by immersing glass cloth in a highly concentrated acid, then rinsing with water, drying, and, if necessary, calcining. For example, the glass cloth can be immersed in hydrochloric acid of pH 1.5 to 2.0, then washed with water, and then heated at 95° C. for about 3 hours for drying treatment to produce the glass cloth. When a firing treatment is further carried out after the drying treatment, a high purity silica cloth having a low shrinkage rate (heat shrinkage suppressed) as shown below can be obtained.

[0020] In the packaging material for a lithium ion secondary battery pack according to the present invention, when the heat-resistant cloth is heat-treated at a temperature of 1000°C for 1 hour, (Dimensions before heating - dimensions after heating) ÷ (Dimensions before heating) × 100 The shrinkage rate represented by the formula is preferably 0 to 10%, more preferably 0 to 7%, and even more preferably 0 to 5%.

[0021] In the packaging material for a lithium ion secondary battery pack according to the present invention, the heat-resistant cloth having the above shrinkage rate can be produced, for example, by baking an unbaked cloth material at 400 to 800°C for 10 minutes or more. For example, a high-purity silica cloth with a low shrinkage rate (suppressed thermal shrinkage) can be produced by immersing a glass cloth in hydrochloric acid of pH 1.5 to 2.0, rinsing it with water, heating it at 95°C for about 3 hours to dry it, and then baking it at 700°C for about 10 minutes.

[0022] In the packaging material for lithium-ion secondary battery packs according to the present invention, the shrinkage rate of the heat-resistant cloth is within the above range, so that even if a flame occurs during use, the expansion of gaps at the seams of the heat-resistant cloth can be easily suppressed, and the spread of the fire during use can be easily suppressed.

[0023] In the packaging material for a lithium-ion secondary battery pack according to the present invention, the heat-resistant cloth is preferably a high-purity silica cloth obtained by acid-treating a glass cloth under the above-mentioned conditions, and then subjected to the above-mentioned heat treatment to impart a desired shrinkage rate.

[0024] In the packaging material for a lithium ion secondary battery pack according to the present invention, the heat-resistant cloth may have aluminum vapor-deposited on its surface to improve its fire resistance.

[0025] In the packaging material for lithium-ion secondary battery packs according to the present invention, the resin constituting the resin composition coated on the surface of the heat-resistant cloth can be one or more selected from fluorine-based resins, acrylic-based resins, polyethylene-based resins, polyethylene oxide (PEO) resins, polypropylene (PP) resins, ethylene vinyl acetate (EVA) resins, rubber-based resins, silicone-based resins, polyvinyl chloride (PVC) resins, and urethane-based resins. In the present application, the rubber-based resin means a polymeric substance having rubber elasticity at room temperature, and examples of the rubber-based resin include one or more selected from acrylic rubber and other elastomers.

[0026] In the packaging material for a lithium ion secondary battery pack according to the present invention, the content of the resin in the resin composition is preferably 20% by mass or less, and more preferably 15% by mass or less, calculated as solid content. Furthermore, in the packaging material for a lithium-ion secondary battery pack according to the present invention, the resin content in the resin composition is, in terms of solid content, more than 0 mass%, preferably 3 mass% or more, more preferably 5 mass% or more, and even more preferably 7 mass% or more.

[0027] In the packaging material for a lithium ion secondary battery pack according to the present invention, the resin composition coated on the surface of the heat-resistant cloth may contain a flame retardant.

[0028] The flame retardant may be at least one selected from organic flame retardants and inorganic flame retardants. The organic flame retardant may be at least one selected from the group consisting of halogen-based flame retardants, phosphorus-based flame retardants, and nitrogen-based flame retardants.

[0029] The halogen-based flame retardant can capture hydroxyl radicals that promote the combustion of thermoplastic resins, thereby suppressing the combustion of the resin composition. Examples of the halogen-based flame retardant include one or more selected from a fluorine-based flame retardant, a chlorine-based flame retardant, a bromine-based flame retardant, and an iodine-based flame retardant. A bromine-based flame retardant or a chlorine-based flame retardant is preferred, and a bromine-based flame retardant is more preferred.

[0030] Examples of the chlorine-based flame retardant include one or more selected from chlorinated polyethylene, chlorinated paraffin, perchlorocyclopentadecane, and the like. Examples of bromine-based flame retardants include one or more selected from 1,2-bis(bromophenyl)ethane, 1,2-bis(pentabromophenyl)ethane, hexabromobenzene, ethylene bis-dibromonorbornanedicarboximide, ethylene bis-tetrabromophthalimide, ethylene bis(pentabromophenyl), tetrabromobisphenol S, and tris(2,3-dibromopropyl-1)isocyanurate.

[0031] Examples of phosphorus-based flame retardants include at least one selected from phosphate esters, condensed phosphate esters, cyclic phosphorus compounds, and red phosphorus.

[0032] Examples of the nitrogen-based flame retardant include one or more selected from guanylurea-based flame retardants such as guanylurea phosphate and melamine-based compounds such as melamine cyanurate.

[0033] When the resin composition contains a flame retardant, the resin composition preferably contains 80 parts by mass or less of the flame retardant per 100 parts by mass of the resin, more preferably 50 parts by mass or less, and even more preferably 40 parts by mass or less. By containing 80 parts by mass or less of the flame retardant per 100 parts by mass of the resin composition, the flexibility of the coated article obtained by coating the resin composition on a heat-resistant cloth can be easily improved. When the resin composition contains a flame retardant, the resin composition preferably contains 20 parts by mass or more of the flame retardant per 100 parts by mass of the resin, more preferably 25 parts by mass or more, and even more preferably 30 parts by mass or more. By containing 20 parts by mass or more of the flame retardant per 100 parts by mass of the resin composition, flame retardancy can be suitably imparted when the resin composition is coated.

[0034] In the packaging material for lithium-ion secondary battery packs according to the present invention, the resin composition coated on the surface of the heat-resistant cloth may contain, in addition to the above-mentioned resin and flame retardant, one or more selected from a crosslinking agent, a crosslinking aid, an antioxidant, a processing aid, a plasticizer, a metal deactivator, a filler, a reinforcing agent, an ultraviolet absorber, a stabilizer, a pigment, a dye, a colorant, an antistatic agent, a foaming agent, and the like.

[0035] The packaging material for a lithium-ion secondary battery pack according to the present invention has a surface area of ​​25 to 115 g / m 2 The resin composition is coated on the surface of the sewn heat-resistant cloth, and the surface is coated with 35 to 100 g / m 2 The resin composition is preferably a sewn product of heat-resistant cloth coated with the above resin composition, and the surface of the product is preferably 40 to 83 g / m 2 More preferably, the material is a sewn product of a heat-resistant cloth coated with the resin composition.

[0036] In this application, the coating amount (g / m) of the resin composition coated on the surface of the heat-resistant cloth is 2 The weight of the heat-resistant cloth when the surface of which is coated with the resin composition is heated at 100°C for 1 hour and dried is referred to as the weight of the heat-resistant cloth when coated with the resin composition and dried (g / m 2 The weight of the heat-resistant cloth after further baking at 1000°C for 30 minutes is referred to as the "weight of the heat-resistant cloth after coating with the resin composition, drying and further heating treatment (g / m)." 2 )" means the value calculated by the following formula. The amount of resin composition coated on the surface of the heat-resistant cloth (g / m 2 )= "Weight (g / m) of heat-resistant cloth when coated with resin composition and dried 2 )- The weight (g / m) of the heat-resistant cloth after coating with the resin composition, drying, and further heat treatment 2 )"

[0037] According to the present invention, by controlling the amount of resin composition coated on the surface of the heat-resistant cloth within the above range, it is possible to suppress the shedding and powder fall-off of inorganic fibers from the heat-resistant cloth, thereby suitably suppressing the opening of seams, and also to impart flexibility to the heat-resistant cloth, thereby easily imparting excellent processability. Furthermore, according to the present invention, by controlling the amount of resin composition coated on the surface of the heat-resistant cloth within the above range, the coated resin composition is carbonized and then decomposed even under high-temperature heating conditions, thereby making it possible to suitably suppress the occurrence of flames on the surface of the heat-resistant cloth.

[0038] Next, a description will be given of how the packaging material for a lithium ion secondary battery pack according to the present invention is used.

[0039] FIG. 1 is a diagram illustrating an example of a usage form of the lithium ion secondary battery pack packaging material according to the present invention, and shows an example of a usage form in which a lithium ion secondary battery pack 2 is packaged using the lithium ion secondary battery pack packaging material 1 according to the present invention.

[0040] The lithium ion secondary battery pack packaging material 1 shown in FIG. 1 is made of a sewn heat-resistant cloth with a predetermined amount of resin composition coated on the surface, and has a shape that encases a lithium ion secondary battery pack 2 in a bag-like manner.

[0041] The heat-resistant cloth coated with a predetermined amount of resin composition on its surface is highly flexible and easy to process, and therefore can be easily sewn into any shape corresponding to the outer shape of the lithium-ion secondary battery pack 2 to be packaged, as shown in FIG. 1, to form a packaging material made of a sewn product having the desired shape.

[0042] Furthermore, as described above, the heat-resistant cloth whose surface is coated with a predetermined amount of resin composition can suppress the loss of inorganic fibers and powder falling off during sewing processing, thereby suppressing opening of seams. Therefore, even when made into a sewn product as exemplified in Figure 1, the shape as a packaging material can be maintained for a long period of time.

[0043] Furthermore, as described above, the heat-resistant cloth coated with a predetermined amount of resin composition on its surface has the desired fire resistance that makes it difficult for flames to erupt even under high-temperature conditions. Therefore, when used as a packaging material 1 made of sewn material as exemplified in FIG. 1, the spread of fire can be easily suppressed even in the event of a fire or the like occurring from a lithium-ion secondary battery pack 2.

[0044] The packaging material for a lithium ion secondary battery pack according to the present invention may have a packaging belt (belt 11 in the example shown in FIG. 1) or string. The packing belt or string is preferably made of the same material as or of the same type as the packing material itself. As described above, the lithium-ion secondary battery pack packaging material 1 illustrated in FIG. 1 has a form in which the lithium-ion secondary battery pack 2 is wrapped up in a bag-like shape, and the lithium-ion secondary battery pack 2 is further secured with a belt 11 while wrapped up in the bag-like shape. By storing the lithium-ion secondary battery pack 2 in this state, the spread of fire can be more effectively suppressed even in the event of a fire or the like occurring in the lithium-ion secondary battery pack 2.

[0045] FIG. 2 is a diagram for explaining another example of use of the lithium ion secondary battery pack packaging material according to the present invention, and shows a schematic cross-sectional view of an example of use in which a lithium ion secondary battery pack 2 is packaged using the lithium ion secondary battery pack packaging material 1 according to the present invention.

[0046] In the example of use shown in FIG. 2, a load O in which lithium ion secondary battery packs 2 are placed on a pallet P is packed with the packaging material for lithium ion secondary battery packs 1 according to the present invention.

[0047] In the example of use shown in Figure 2, the lithium ion secondary battery pack 2 is placed on a pallet P (as a placed object O) and packaged together with the pallet P in the packaging material for lithium ion secondary battery packs 1 of the present invention.

[0048] In the example of use shown in Figure 2, the lithium ion secondary battery pack 2 may be placed on a pallet P with sleepers S interposed therebetween, as illustrated in Figure 2, and packaged together with the pallet P and the sleepers S in the packaging material for lithium ion secondary battery packs 1 according to the present invention.

[0049] In the example of use shown in Figure 2, the packaging material 1 for lithium-ion secondary battery packs has a roughly rectangular shape (a wrapping cloth shape) when unfolded, and is made by folding back and sewing at least some of the sides of, for example, a rectangular heat-resistant cloth coated with a resin composition, thereby preventing inorganic fibers from coming off the heat-resistant cloth and providing sufficient reinforcement.

[0050] In the packaging material for lithium-ion secondary battery packs according to the present invention, the lithium-ion secondary battery packs to be packed can be heavy, weighing several hundred kg in some cases. Therefore, if the packaging material for lithium-ion secondary battery packs according to the present invention has a roughly bag-like shape as shown in FIG. 1, it becomes difficult to accommodate the lithium-ion secondary battery packs inside the packaging material, and workability decreases. For this reason, as will be described later, it is easy to use a loading vehicle such as a forklift to place the lithium ion secondary battery pack 2 to be packaged on a pallet P, as illustrated in Figure 2, and then package the lithium ion secondary battery pack 2 together with the pallet P using the packaging material for lithium ion secondary battery packs 1 of the present invention to create a packaged item.

[0051] In the example of use shown in Figure 2, it is preferable to wrap a load O, which is a pallet P on which lithium-ion secondary battery packs 2 are placed, in the packaging material 1 for lithium-ion secondary battery packs according to the present invention, and then seal the end of the packaging material 1 by appropriately fastening it with packing string or the like. In this way, by wrapping the lithium ion secondary battery pack 2 in the packaging material 1 for lithium ion secondary battery packs according to the present invention and further tying it up with string or the like, and storing it in this state, the spread of fire can be more effectively suppressed even in the event of a fire or the like occurring in the lithium ion secondary battery pack 2.

[0052] According to the present invention, it is possible to provide a packaging material for lithium-ion secondary battery packs that is sewn from heat-resistant cloth but is less likely to open at the seams, can be manufactured with excellent processability, and exhibits high fire resistance.

[0053] Next, the lithium ion secondary battery pack package according to the present invention will be described. A lithium ion secondary battery pack package according to the present invention is characterized in that a lithium ion secondary battery pack is packaged in the packaging material for lithium ion secondary battery packs according to the present invention.

[0054] The details of the packaging material for a lithium ion secondary battery pack according to the present invention, which constitutes the lithium ion secondary battery pack package according to the present invention, are as described above.

[0055] Furthermore, in the lithium ion secondary battery pack package according to the present invention, the lithium ion secondary battery pack to be packaged is not particularly limited, and can be appropriately selected from known ones.

[0056] The details of the exemplary forms of the lithium ion secondary battery pack packaging according to the present invention are as described in the exemplary use forms of the packaging material for lithium ion secondary battery packs according to the present invention, and specific forms thereof can include exemplary forms shown in Figures 1 and 2. The lithium ion secondary battery pack package 3 illustrated in Figures 1 and 2 is a lithium ion secondary battery pack 2 packaged in the lithium ion secondary battery pack packaging material 1 of the present invention, and the details of which are as described above.

[0057] The lithium ion secondary battery pack package according to the present invention is formed by packaging a lithium ion secondary battery pack using the packaging material for lithium ion secondary battery packs according to the present invention. Therefore, the packaging material, which is made of a sewn product, is prevented from opening at the seams, and the packaged state of the lithium ion secondary battery pack can be maintained for a long period of time. In addition, the packaging material is highly flexible and easy to process, so it can easily take any shape that corresponds to the external shape of the lithium ion secondary battery pack. Furthermore, it exhibits excellent fire resistance, so that the spread of fire can be effectively suppressed even if the lithium ion secondary battery pack catches fire or the like.

[0058] Next, a method for manufacturing a lithium ion secondary battery pack package according to the present invention will be described. The method for manufacturing a lithium ion secondary battery pack package according to the present invention comprises a method 1 for manufacturing a lithium ion secondary battery pack package according to the present invention and a method 2 for manufacturing a lithium ion secondary battery pack package according to the present invention.

[0059] A manufacturing method 1 for a lithium ion secondary battery pack package according to the present invention is a method for manufacturing a lithium ion secondary battery pack package in which a load of lithium ion secondary battery packs placed on a pallet is packaged in the packaging material for lithium ion secondary battery packs according to the present invention, With the lithium ion secondary battery pack placed on the pallet, the pallet is lifted, and then The packaging material for a lithium ion secondary battery pack according to the present invention is pulled under the pallet, and then The load on the pallet with the lithium ion secondary batteries placed thereon is packed in the packaging material for lithium ion secondary battery packs. It is characterized by the following.

[0060] First, a manufacturing method 1 for a lithium ion secondary battery pack package according to the present invention will be described with reference to FIG. FIG. 3 is a diagram for explaining the manufacturing method 1 for a lithium ion secondary battery pack package according to the present invention, and shows a cross-sectional schematic diagram of a product in each manufacturing step of the lithium ion secondary battery pack package according to the present invention in the manufacturing method 1 for a lithium ion secondary battery pack package according to the present invention.

[0061] In the manufacturing method 1 for a lithium ion secondary battery pack package according to the present invention, first, a load O is prepared in which lithium ion secondary battery packs 2 are placed on a pallet P, as shown in the schematic cross-sectional view of FIG. 3(a). As shown in FIG. 3(a), the object O may be a pallet P on which a lithium ion secondary battery pack 2 is placed with sleepers S interposed therebetween.

[0062] In the manufacturing method 1 for a lithium ion secondary battery pack package according to the present invention, next, as shown in the schematic cross-sectional view of FIG. 3(b), the pallet P is lifted up with the lithium ion secondary battery pack 2 placed on it. The pallet P can be easily lifted by using a loading vehicle such as a forklift.

[0063] In the manufacturing method 1 for a lithium ion secondary battery pack package according to the present invention, next, as shown in the schematic cross-sectional view of Figure 3(c), with the load O lifted, the packaging material 1 for a lithium ion secondary battery pack according to the present invention is pulled below the pallet P that constitutes the load O, and then the load O is placed on this packaging material 1 for a lithium ion secondary battery pack. The load O can be easily placed on the packaging material 1 for lithium ion secondary battery packs by using a cargo handling vehicle such as a forklift.

[0064] In the manufacturing method 1 for a lithium-ion secondary battery pack package according to the present invention, next, as shown in the cross-sectional schematic diagram of Figure 3(d), a load O having lithium-ion secondary batteries 2 placed on a pallet P is packed in the packaging material 1 for lithium-ion secondary battery packs (pulled under the pallet P), thereby forming a lithium-ion secondary battery pack package 3 in which the lithium-ion secondary battery packs 2 are packed in the packaging material 1 for lithium-ion secondary battery packs according to the present invention.

[0065] In Figure 3, an example has been given in which the packing work of the cargo O using the packaging material 1 for the lithium-ion secondary battery pack is carried out on the ground E, but it is also possible to place a separate temporary pallet on the ground E and carry out the packing work of the cargo O using the packaging material 1 for the lithium-ion secondary battery pack on this temporary pallet.

[0066] In the method for manufacturing a lithium-ion secondary battery pack package according to the present invention, the lithium-ion secondary battery pack to be packaged may be heavy, weighing several hundred kg in some cases, as described above. For this reason, it is conceivable that the lithium-ion secondary battery pack may be difficult to package in packaging material. However, according to method 1 for manufacturing a lithium-ion secondary battery pack package according to the present invention, the lithium-ion secondary battery pack is placed on a pallet and packaged using a loading vehicle such as a forklift, where appropriate, thereby enabling the lithium-ion secondary battery pack package according to the present invention to be easily manufactured.

[0067] Furthermore, a method 2 for manufacturing a lithium ion secondary battery pack package according to the present invention is a method for manufacturing a lithium ion secondary battery pack package in which a load of lithium ion secondary battery packs placed on a pallet is packaged in the packaging material for lithium ion secondary battery packs according to the present invention, A load in which lithium ion secondary batteries are placed on a pallet is placed on the packaging material for lithium ion secondary battery packs according to the present invention, and then The lithium ion secondary battery pack packaging material is used to pack a load of lithium ion secondary batteries placed on the pallet. It is characterized by the following.

[0068] First, a second manufacturing method for a lithium ion secondary battery pack package according to the present invention will be described with reference to FIG. FIG. 4 is a diagram for explaining the manufacturing method 2 for a lithium ion secondary battery pack package according to the present invention, and shows a cross-sectional schematic diagram of a product at each manufacturing step of the lithium ion secondary battery pack package according to the present invention in the manufacturing method 2 for a lithium ion secondary battery pack package according to the present invention.

[0069] In the manufacturing method 2 of the lithium ion secondary battery pack packaging material of the present invention, first, as shown in the schematic cross-sectional view of FIG. 4(a), the packaging material 1 for the lithium ion secondary battery pack of the present invention is placed in the desired position where the packaging material is to be formed.

[0070] In the manufacturing method 2 for a lithium ion secondary battery pack package according to the present invention, next, as shown in the schematic cross-sectional view of FIG. 4(b), a load O on which lithium ion secondary batteries 2 are placed is lifted up on a pallet P, and then, as shown in the schematic cross-sectional view of FIG. 4(c), the load O is placed on the packaging material for lithium ion secondary battery packs 1 according to the present invention.

[0071] As shown in FIG. 4(b), the object O may be a pallet P on which a lithium ion secondary battery pack 2 is placed via sleepers S.

[0072] The cargo O, which is a pallet P on which lithium-ion secondary batteries 2 are placed, can be easily lifted and placed on the packaging material 1 for lithium-ion secondary battery packs by using a loading vehicle such as a forklift to raise and lower the pallet P that constitutes the cargo O.

[0073] In the manufacturing method 2 for a lithium-ion secondary battery pack package according to the present invention, next, as shown in FIG. 4(d), a load O having lithium-ion secondary batteries 2 placed on a pallet P is packed in the packaging material 1 for lithium-ion secondary battery packs, thereby forming a lithium-ion secondary battery pack package 3 in which the lithium-ion secondary battery packs 2 are packed in the packaging material 1 for lithium-ion secondary battery packs.

[0074] In Figure 4, an example has been described in which the packaging work of the load O using the packaging material 1 for the lithium-ion secondary battery pack is carried out on the ground E, but it is also possible to place a separate temporary placement pallet on the ground E and carry out the packaging work of the load O using the packaging material 1 for the lithium-ion secondary battery pack on this temporary placement pallet.

[0075] In the method for manufacturing a lithium-ion secondary battery pack package according to the present invention, the lithium-ion secondary battery pack to be packaged may be heavy, weighing several hundred kg in some cases, as described above. For this reason, it is conceivable that the lithium-ion secondary battery pack may be difficult to package in packaging material. However, according to method 2 for manufacturing a lithium-ion secondary battery pack package according to the present invention, the lithium-ion secondary battery pack is placed on a pallet and packaged using a loading vehicle such as a forklift, whereby the lithium-ion secondary battery pack package according to the present invention can be easily manufactured.

[0076] According to the present invention, a method for easily manufacturing lithium ion secondary battery pack packages can be provided using packaging material for lithium ion secondary battery packs that is sewn from heat-resistant cloth but is less likely to open at the seams, can be manufactured with excellent processability, and exhibits high fire resistance.

[0077] Next, the present invention will be described in more detail with reference to examples and comparative examples, but these are merely illustrative and do not limit the present invention.

[0078] Example 1 1. Production of heat-resistant cloth coated with a resin composition (1) Resin composition An acrylic-modified silicone resin composition was prepared as the resin composition. (2) Heat-resistant cloth The woven E-glass cloth was immersed in hydrochloric acid, washed with water, dried at 95°C for 3 hours, and then calcined at 700°C for 10 minutes to obtain a high-purity silica cloth (made of silica fibers with a silica (SiO2) content of 96% by mass) as a heat-resistant cloth. The obtained high purity silica cloth was cut into a measurement sample of 120 cm length and 120 cm width, and heat treated at a temperature of 1000°C for 1 hour. When the dimensions of the measurement sample in the length direction after heating were measured, (Dimensions before heating - dimensions after heating) ÷ (Dimensions before heating) × 100 The shrinkage rate was 5%. (3) Coating treatment The heat-resistant cloth obtained in (2) above was coated with the acrylic-modified silicone resin composition prepared in (1) above, to form a surface of 45 g / m 2 A heat-resistant cloth coated with the resin composition was obtained.

[0079] 2. Manufacture of packaging materials for lithium-ion secondary battery packs 45g / m2 on the surface obtained in step 1 above 2 The heat-resistant cloth coated with the resin composition was sewn together to produce a packaging material 1 for a lithium-ion secondary battery pack in the shape of a bag having a belt 11 as shown in FIG. The heat-resistant cloth was coated with a resin composition, and therefore was flexible and could be easily processed. Furthermore, when the obtained bag-shaped packaging material for lithium ion secondary battery packs was used to pack lithium ion secondary battery packs, the packing was successful.

[0080] <Fire resistance test> The heat-resistant cloth coated with the resin composition obtained in 1 above and the sewn portion of the packaging material for lithium-ion secondary battery packs obtained in 2 above were each cut into a rectangular shape measuring 60 cm in length and 60 cm in width to prepare test pieces. One side of the obtained test pieces was placed in a formwork so that the size of the opening to be heated was 50 cm in length and 50 cm in width, and a fire resistance test was performed by heating from room temperature to 945°C in one hour, following the standard heating curve specified in ISO834. For comparison, a test piece was also obtained when heating was stopped midway (1 minute after the start of heating) from room temperature to 945°C over 1 hour under the above conditions. At this time, photographic images of test piece 1 (heat-resistant cloth coated with a resin composition) and test piece 2 (sewn part of packaging material for a lithium-ion secondary battery pack) in the states "before heating," "1 minute after heating started," and "after heating" are shown in Figure 5.

[0081] For both test specimen 1 and test specimen 2, no flames were emitted on the side opposite the heated side (non-heated side) shown in Figure 5 during the heat treatment, and no damage such as cracks or gaps were observed "after heating" as shown in Figure 5. In this regard, as shown in Figure 5, for both test specimen 1 and test specimen 2, the surface opposite the heated surface (the non-heated surface) was white "before heating," but by heat treatment, the resin on the surface was carbonized to a black color "one minute after heating began," and by further heat treatment, the carbonized resin decomposed and turned white "after heating," demonstrating that the occurrence of flames on the surface can be suitably suppressed.

[0082] Furthermore, as shown in Figure 5, test piece 2 is made of a sewn heat-resistant cloth coated on its surface with a resin composition, and therefore, on the side opposite the heated side (the non-heated side), there is no loss of inorganic fibers or powder falling off from the heat-resistant cloth either "before heating" or "after heating," and it can be seen that opening of the seams can be suppressed. [Industrial Applicability]

[0083] According to the present invention, it is possible to provide a packaging material for lithium-ion secondary battery packs that is sewn from heat-resistant cloth but is less likely to have gaps at the seams, can be manufactured with excellent processability, and exhibits high fire resistance, and it is also possible to provide a lithium-ion secondary battery pack package and a method for manufacturing a lithium-ion secondary battery pack package. [Explanation of symbols]

[0084] 1. Packaging materials for lithium-ion secondary battery packs 2 Lithium-ion secondary battery pack 3 Lithium-ion secondary battery pack packaging 11 Belt S sleeper P Palette O Load E Ground

Claims

1. Surface: 25 to 115 g / m ２ A packaging material for a lithium ion secondary battery pack, comprising a sewn heat-resistant cloth coated with the resin composition of claim 1.

2. 2. The packaging material for a lithium ion secondary battery pack according to claim 1, wherein the resin composition contains one or more resins selected from the group consisting of fluorine-based resins, acrylic-based resins, polyethylene-based resins, polyethylene oxide (PEO) resins, polypropylene (PP) resins, ethylene vinyl acetate (EVA) resins, rubber-based resins, silicone-based resins, polyvinyl chloride (PVC) resins, and urethane-based resins.

3. 2. The packaging material for a lithium ion secondary battery pack according to claim 1, wherein the heat-resistant cloth is a glass cloth, a silica cloth, or an alumina cloth.

4. When the heat-resistant cloth is heat-treated at a temperature of 1000°C for 1 hour, (Dimensions before heating - dimensions after heating) ÷ (Dimensions before heating) x 100 2. The packaging material for a lithium ion secondary battery pack according to claim 1, wherein the shrinkage rate represented by the formula (1) is 0 to 10%.

5. 2. A lithium ion secondary battery pack package, comprising a lithium ion secondary battery pack packaged in the packaging material for lithium ion secondary battery packs according to claim 1.

6. 6. The lithium ion secondary battery pack package according to claim 5, wherein a load of lithium ion secondary battery packs placed on a pallet is packaged in the packaging material for lithium ion secondary battery packs according to claim 1.

7. A method for manufacturing the lithium ion secondary battery pack package according to claim 6, comprising: With the lithium ion secondary battery pack placed on the pallet, the pallet is lifted, and then The packaging material for a lithium ion secondary battery pack according to claim 1 is pulled under the pallet, and then The load on the pallet with the lithium ion secondary batteries placed thereon is packed in the packaging material for lithium ion secondary battery packs.

1. A method for manufacturing a lithium ion secondary battery pack package, comprising:

8. A method for manufacturing the lithium ion secondary battery pack package according to claim 6, comprising: A load comprising a pallet on which lithium ion secondary batteries are placed is placed on the packaging material for lithium ion secondary battery packs according to claim 1, and then The lithium ion secondary battery pack packaging material is used to pack a load of lithium ion secondary batteries placed on the pallet.

1. A method for manufacturing a lithium ion secondary battery pack package, comprising:

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