JP6503847B2 - Method of manufacturing battery - Google Patents

Description

  The present invention relates to a method of manufacturing a battery, a battery holder, a battery manufacturing system, and a method of inspecting a battery.

  A lithium ion battery is one in which an electrolyte such as an organic electrolytic solution is sealed, but if a pinhole occurs or the degree of sealing is low, the electrolyte may leak. In order to prevent such a leak, for example, an inspection apparatus as disclosed in Patent Document 1 has been proposed. This inspection apparatus inspects for leakage as follows. First, the battery is placed in the sealed inspection space of the inspection apparatus. Subsequently, the test space is depressurized, the electrolyte component is leaked from the battery, and the leaked electrolyte component is measured. Thereby, when the electrolyte component has leaked from the battery, this can be detected.

Patent No. 5050139

  However, in the above-described inspection method, it may take time for the electrolyte component to leak from the battery into the inspection space. For example, depending on the degree of sealing of the battery, despite the failure, it may take a long time for the electrolyte component to leak until it can be detected. Such a problem of inspection is not limited to lithium ion batteries, and may be a general problem of batteries formed by housing a battery element containing an electrolyte in a packaging material.

  The present invention has been made to solve the above-mentioned problems, and a method of manufacturing a battery, a battery holder, and a battery manufacturing method capable of inspecting the leakage of the electrolyte component from the battery as described above in a short time. An object of the present invention is to provide a system and a method of inspecting a battery.

  The first method for producing a battery according to the present invention comprises the steps of preparing a container at least a part of which is configured to be openable, and at least one battery in which a battery element containing an electrolyte is contained and sealed. A step of forming a battery container by storing and sealing the container in the container, a step of storing the battery container for a predetermined time, disposing the battery container in the inspection space and opening the container Checking the leak of the electrolyte component from the container by depressurizing the pressure sensor.

  According to this configuration, after the battery is accommodated in the battery container and stored for a predetermined time, leakage of the electrolyte component is detected in the inspection space. On the other hand, for example, when the battery is disposed directly in the inspection space and the leakage of the electrolyte component is inspected, if it takes time for the electrolyte component to leak out of the battery, the inspection may take a long time. Therefore, in the present invention, since the battery container containing the battery in the container is formed and stored for a predetermined time, if there is leakage of the electrolyte component, the electrolyte component is accumulated in the container during storage. Therefore, if the battery container after storage is placed in the inspection space and opened, the electrolyte component accumulated in the container can be detected in a short time. Therefore, the time required for the inspection for the leakage of the electrolyte component can be significantly reduced.

  In addition, in the manufacture of a battery, in order to impregnate the electrolyte into the electronic device, a process of storing the battery for a predetermined time, that is, a so-called aging process may be performed after the battery is formed. Therefore, in the present invention, since the step of storing the battery case can be performed using this aging step, it is not necessary to separately provide a storage step. Therefore, the manufacturing time can be shortened also from this viewpoint.

  A second method for manufacturing a battery according to the present invention comprises at least the steps of preparing a container having an opening part to be opened by a pressure difference between an internal space and the outside, and sealing a battery element containing an electrolyte in a packaging material. A step of forming a battery container by accommodating and sealing one battery in a container, a step of storing the battery container for a predetermined time, disposing the battery container in an inspection space, and the inspection Decompressing the inside of the space to unseal the unsealing part and checking for leakage of the electrolyte component from the container.

  In the first method of manufacturing the battery, the container is opened when the battery container is disposed in the inspection space. However, in the second method of manufacturing the battery, the container is opened due to the pressure difference between the internal space and the outside. Use a container having an opening part. Thus, when the battery container is disposed in the inspection space and the pressure in the inspection space is reduced, the unsealing portion of the container is automatically opened by the pressure difference. Therefore, compared with the first method for manufacturing a battery, the step of opening the container is not necessary, and the leakage inspection can be performed more easily.

  In the manufacturing method of each said battery, the storage temperature can be 20-85 degreeC, for example at the step of storing the said battery container for predetermined time.

  As described above, when the storage temperature of the battery is higher than that at normal temperature, the internal pressure of the packaging material is increased, and the electrolyte component is likely to leak out. Thereby, the electrolyte component is easily accumulated in the container, and as a result, the inspection time can be further shortened.

  In the manufacturing method of each said battery, several said batteries can be accommodated in the said container.

  As described above, when a plurality of batteries are accommodated in the container, the inspection on the plurality of batteries can be performed at one time, and therefore the time required for the inspection can be further shortened.

  In the method of manufacturing a battery according to the present invention, the packaging material of the battery is not particularly limited, and various materials such as a metal material and a hard resin material can be used. A battery can also be formed by forming a sheet-like material formed of at least one layer of material, and accommodating and sealing the battery element in the sheet-like material. Thereby, in addition to the leakage from the pinhole etc. of the packaging material, for example, the leakage of the electrolyte component due to the failure of the seal can also be detected.

  A battery container according to the present invention comprises at least one battery in which a battery element containing an electrolyte is housed and sealed in a packaging material, and a container configured to be openable at least in part and housing the battery in a sealed state; Is equipped.

  In the above-mentioned battery container, the container can have an unsealing portion which is opened by a pressure difference between an internal space and the outside.

  A battery manufacturing system according to the present invention comprises at least one battery including a battery forming portion forming a battery in which a battery element containing an electrolyte is enclosed in a packaging material and sealed, and a container at least a part of which is configured to be openable. A battery storage unit forming a battery storage unit by storing and sealing the battery storage unit, a storage unit for storing the battery storage unit for a predetermined time, and an inspection space for storing the battery storage unit taken out from the storage unit. And an inspection unit for inspecting leakage of the electrolyte component from the container of the battery container.

  In the first method of inspecting a battery according to the present invention, at least one battery in which a battery element containing an electrolyte is housed and sealed in a packaging material is housed and sealed in a container at least a part of which is configured to be openable. Providing the battery container, storing the battery container for a predetermined time, and disposing the battery container in the examination space and opening the container for leakage of the electrolyte component from the container. And testing.

  The inspection method of the 2nd battery concerning the present invention is a container which has an opening part which unseals at least one battery which stored and sealed a battery element containing an electrolyte in a packing material according to a pressure difference between internal space and the outside. A step of preparing a battery container formed by housing and sealing, a step of storing the battery container for a predetermined time, disposing the battery container in an inspection space, and reducing the pressure in the inspection space And unsealing the unsealing portion to check for leakage of the electrolyte component from the container.

  According to the present invention, it is possible to check the leakage of the electrolyte component from the battery in a short time.

It is a top view showing one embodiment of a battery concerning the present invention. It is the sectional view on the AA line of FIG. It is sectional drawing of the sheet material which comprises the packaging material of FIG. It is the top view (a) and sectional drawing (b) of a battery container. It is a flowchart which shows the manufacturing method of the battery which concerns on one Embodiment of this invention. 1 is a block diagram of a battery manufacturing system according to an embodiment of the present invention. It is sectional drawing which shows the sealing state in the peripheral part of a packaging material. It is a schematic block diagram of the inspection device concerning one embodiment of the present invention.

  Hereinafter, an embodiment of a method of manufacturing a battery according to the present invention will be described with reference to the drawings. Below, after demonstrating the battery used as object, and the battery container which accommodates this, the manufacturing method of the battery including a manufacturing system is demonstrated.

<1. Battery Overview>
FIG. 1 is a plan view of a battery according to the present embodiment, and FIG. 2 is a cross-sectional view taken along line AA of FIG. As shown in FIGS. 1 and 2, the battery 1 according to the present embodiment includes a battery element 4 having a positive electrode, a negative electrode, and an electrolyte, and the battery element 4 is accommodated in the packaging material 3. The packaging material 3 is composed of a pair of rectangular sheet materials, and the packaging material 3 having an internal space is formed by heat-sealing the peripheral portions 30 of these sheet materials. The battery element 4 described above is disposed in the internal space of the packaging material 3. Then, a pair of metal terminals 2 electrically connected to the battery element 4 project to the outside from the peripheral portion of the packaging material. Specifically, each metal terminal 2 protrudes to the outside in a state of being sandwiched by the peripheral portions 30 of the heat-sealed pair of sheet members.

<1-1. Battery element>
The battery element 4 according to the present embodiment is not particularly limited, and the battery element 4 for a battery described below can be used. For example, although any of a primary battery and a secondary battery may be used, a secondary battery is preferable. The type of secondary battery is not particularly limited. For example, lithium ion battery, lithium ion polymer battery, lead storage battery, nickel hydrogen storage battery, nickel cadmium storage battery, nickel iron storage battery, nickel zinc storage battery Examples include batteries, silver oxide / zinc storage batteries, metal air batteries, multivalent cation batteries, capacitors, capacitors and the like. Among these secondary batteries, preferably, lithium ion batteries and lithium ion polymer batteries are mentioned.

<1-2. Metal terminal>
Although the metal terminal 2 can be made into various aspects, if it shows an example, it is as follows, for example. For example, the metal terminal 2 has a metal member 21 and a metal terminal adhesive film 22. The metal terminal adhesive film layer 22 is formed on at least a part of a portion on the surface of the metal member 21 where the metal terminal 2 is sandwiched by the packaging material 3. The metal terminal adhesive film layer 22 is on the surface of the metal member, and the metal terminal 2 is used as a packaging material, from the viewpoint of providing the metal terminal 2 with further excellent electrolytic solution resistance and short circuit preventing performance. It is more preferable to form in the whole surface of the part clamped.

<1-2-1. Metal member>
The metal member 21 is formed of a metal material, and secures the conductivity of the battery metal terminal 2. It does not restrict | limit especially as a metal material which comprises the metal terminal 2, For example, aluminum, nickel, copper etc. are mentioned. For example, the metal terminal 2 connected to the positive electrode of a lithium ion battery is usually made of aluminum or the like. The metal terminal 2 connected to the negative electrode of the lithium ion battery is usually made of copper, nickel or the like. When the metal member 21 is formed of the above-described metal material, the metal member 21 may be an alloy containing another metal.

  The size of the metal member 21 may be appropriately set according to the size of the battery to be used. The thickness of the metal member 21 is preferably about 50 to 1000 μm, more preferably about 70 to 800 μm. The length of the metal member 21 is preferably about 1 to 200 mm, more preferably about 3 to 150 mm. The width of the metal member 21 is preferably about 1 to 200 mm, more preferably about 3 to 150 mm.

<1-2-2. Metal terminal adhesive film layer>
The metal terminal adhesive film layer 22 is interposed between the metal terminal 2 and the packaging material 3 and heat-seals the peripheral portion 30 so that the adhesion between the metal terminal 2 and the packaging material 3 and the packaging material at the time of heat sealing It is for preventing that the 3 metal foil layer 33 and the metal terminal 2 short-circuit. As the metal terminal adhesive film layer 22, a laminate of a single layer or a multilayer of an acid-modified polyolefin resin, or a laminate in which an acid-modified polyolefin resin is laminated on both sides of a heat resistant substrate can be used.

<1-3. Packaging material>
Hereinafter, an example of the packaging material 3 will be described with reference to FIG. FIG. 3 is a cross-sectional view of a sheet material constituting the packaging material. As shown in the figure, as the packaging material 3, one having a laminated structure of a laminate having at least a base layer 31, an adhesive layer 32, a metal foil layer 33, and a sealant layer 34 in this order can be mentioned. As an example of the cross-sectional structure of the packaging material 3 in FIG. 3, it shows about the aspect by which the base material layer 31, the contact bonding layer 32, the metal foil layer 33, and the sealant layer 34 are laminated | stacked in this order. In the packaging material 3, the base material layer 31 is the outermost layer, and the sealant layer 34 is the innermost layer. At the time of assembly of the battery, the sealant layers 34 located on the periphery of the battery element 4 are brought into contact with each other and heat-welded, whereby the battery element 4 is sealed and the battery element 4 is sealed. Although FIGS. 1 to 3 illustrate the battery 1 in the case of using the embossed type packaging material 3 formed by embossing or the like, even if the packaging material 3 is a pouch type that is not formed. Good. In addition, although a three-way seal, a four-way seal, a pillow type etc. exist in a pouch type, any type may be sufficient.

<1-3-1. Base layer>
In the packaging material 3, the base material layer 31 is a layer that functions as a base material of the packaging material, and is a layer that forms the outermost layer.

  The material for forming the base layer 31 is not particularly limited as long as it has insulation. As a raw material which forms the base material layer 31, polyester, a polyamide, an epoxy, an acryl, a fluorine resin, polyurethane, a silicone resin, a phenol, a polyether imide, a polyimide, and these mixtures, a copolymer, etc. are mentioned, for example.

  Specific examples of the polyester include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene isophthalate, polycarbonate, copolymer polyester having ethylene terephthalate as a main unit of repeating unit, and butylene terephthalate as a repeating unit And copolyesters based on the above. Further, as a copolymerized polyester having ethylene terephthalate as the main component of the repeating unit, specifically, a copolymer polyester in which ethylene terephthalate is polymerized as the main component of the repeating unit with ethylene isophthalate (hereinafter, polyethylene (terephthalate / isophthalate) Polyethylene (terephthalate / isophthalate), polyethylene (terephthalate / adipate), polyethylene (terephthalate / sodium sulfoisophthalate), polyethylene (terephthalate / sodium isophthalate), polyethylene (terephthalate / phenyl-dicarboxylate) , Polyethylene (terephthalate / decane dicarboxylate) and the like. Further, as a copolymerized polyester having butylene terephthalate as the main component of the repeating unit, specifically, a copolymer polyester in which butylene terephthalate is polymerized with butylene isophthalate as the main component of the repeating unit (hereinafter, polybutylene (terephthalate / isophthalate) And polybutylene (terephthalate / adipate), polybutylene (terephthalate / sebacate), polybutylene (terephthalate / decanedicarboxylate), polybutylene naphthalate and the like. These polyesters may be used alone or in combination of two or more. Polyester has an advantage that it is excellent in electrolytic solution resistance and is less likely to cause whitening or the like due to adhesion of the electrolytic solution, and is suitably used as a forming material of the base material layer 31.

  In addition, as the polyamide, specifically, aliphatic polyamides such as nylon 6, nylon 66, nylon 610, nylon 12, nylon 46, copolymers of nylon 6 and nylon 6, 6; terephthalic acid and / or Or hexamethylenediamine-isophthalic acid-terephthalic acid copolymerized polyamide such as nylon 6I, nylon 6T, nylon 6IT, nylon 6 I 6T (I is isophthalic acid, T represents terephthalic acid) containing constitutional units derived from isophthalic acid Aromatic-containing polyamides such as taxylylene adipamide (MXD6); alicyclic polyamides such as polyaminomethyl cyclohexyl adipamide (PACM 6); and lactam components and isocyanate components such as 4,4'-diphenylmethane-diisocyanate Copolymerized polyamide, Polyester amide copolymer and polyether ester amide copolymer is a copolymer of polymerized polyamide and polyester and polyalkylene ether glycol; copolymers thereof, and the like. These polyamides may be used alone or in combination of two or more. The stretched polyamide film is excellent in stretchability, can prevent the occurrence of whitening due to resin cracking of the base material layer 31 at the time of molding, and is suitably used as a forming material of the base material layer 31.

  The base material layer 31 may be formed of a uniaxially or biaxially stretched resin film, or may be formed of an unstretched resin film. Among them, a uniaxially or biaxially stretched resin film, in particular a biaxially stretched resin film, is suitably used as the base layer 31 because its heat resistance is improved by orientation crystallization.

  Among these, as a resin film which forms the base material layer 31, Preferably nylon, polyester, More preferably, biaxially stretched nylon, biaxially stretched polyester, Most preferably, biaxially stretched polyester is mentioned.

  The base material layer 31 can also be formed by laminating resin films of different materials in order to improve the pinhole resistance and the insulation when forming a battery package. Specifically, a multilayer structure in which a polyester film and a nylon film are laminated, a multilayer structure in which a biaxially oriented polyester and a biaxially oriented nylon are laminated, and the like can be mentioned. When the base layer 31 has a multilayer structure, each resin film may be bonded via an adhesive, or may be directly laminated without using an adhesive. In the case of bonding without using an adhesive, for example, a method of bonding in a hot-melted state such as a coextrusion method, a sand lamination method, a thermal lamination method and the like can be mentioned.

  In addition, the base material layer 31 may have low friction in order to improve formability. In the case of reducing the friction of the base layer 31, the friction coefficient of the surface thereof is not particularly limited, and may be, for example, 1.0 or less. In order to reduce the friction of the base layer 31, for example, matting, formation of a thin film layer of a slip agent, a combination thereof, and the like can be mentioned.

  The thickness of the base layer 31 is, for example, about 10 to 50 μm, preferably about 15 to 30 μm.

1-3-2. Adhesive layer>
In the packaging material 3, the adhesive layer 32 is a layer disposed on the base material layer 31 in order to impart adhesion to the base material layer 31. That is, the adhesive layer 32 is provided between the base layer 31 and the metal foil layer 33.

  The adhesive layer 32 is formed of an adhesive capable of adhering the base layer 31 and the metal foil layer 33. The adhesive used to form the adhesive layer 32 may be a two-part curable adhesive or a one-part curable adhesive. The adhesion mechanism of the adhesive used to form the adhesion layer 32 is not particularly limited, and any of a chemical reaction type, a solvent volatilization type, a heat melting type, a heat pressure type, etc. may be used.

  Specific examples of the resin component of the adhesive that can be used to form the adhesive layer 32 include polyesters such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene isophthalate, polycarbonate, copolyester, etc. Resins; Polyether adhesives; Polyurethane adhesives; Epoxy resins; Phenolic resins; Polyamide resins such as nylon 6, nylon 66, nylon 12, copolymerized polyamides, etc. Polyolefins, acid-modified polyolefins, metal-modified polyolefins, etc. Polyolefin resins; Polyvinyl acetate resins; Cellulose adhesives; (Meth) acrylic resins; Polyimide resins; Amino resins such as urea resins and melamine resins; Chloroprene rubber, Nitrile rubber, Sty Silicone resin; - down rubber such as butadiene rubber fluorinated ethylene propylene copolymer, and the like. These adhesive components may be used alone or in combination of two or more. The combination mode of two or more adhesive components is not particularly limited, but, for example, as the adhesive component, a mixed resin of a polyamide and an acid-modified polyolefin, a mixed resin of a polyamide and a metal-modified polyolefin, a polyamide and a polyester, A mixed resin of polyester and acid-modified polyolefin, a mixed resin of polyester and metal-modified polyolefin, and the like can be mentioned. Among them, the ductility, durability under high humidity conditions, a response suppressing action, a heat degradation suppressing action and the like are excellent, and a decrease in the lamination strength between the base material layer 31 and the metal foil layer 33 is suppressed. From the viewpoint of effectively suppressing the occurrence of delamination, preferably a polyurethane-based two-component curing adhesive; polyamide, polyester, or a blend resin of these with modified polyolefin is mentioned.

  Also, the adhesive layer 32 may be multilayered with different adhesive components. When forming the adhesive layer 32 in multiple layers with different adhesive components, from the viewpoint of improving the lamination strength of the substrate layer 31 and the metal foil layer 33, the adhesive component disposed on the substrate layer 31 side is used as a substrate layer It is preferable to select a resin that is excellent in adhesion to 31 and to select an adhesive component that is excellent in adhesiveness to the metal foil layer 33 as the adhesive component disposed on the metal foil layer 33 side. When the adhesive layer 32 is multilayered with different adhesive components, specifically, as an adhesive component disposed on the metal foil layer 33 side, acid-modified polyolefin, metal-modified polyolefin, polyester and acid-modified polyolefin are preferably used. And resins containing copolyester, and the like.

  The thickness of the adhesive layer 32 is, for example, about 2 to 50 μm, preferably about 3 to 40 μm.

1-3-3. Metal foil layer>
In the packaging material 3, the metal foil layer 33 is a layer that functions as a barrier layer for preventing water vapor, oxygen, light and the like from invading the inside of the battery, in addition to the strength improvement of the packaging material. Specifically as a metal which forms the metal foil layer 33, metal foils, such as aluminum, stainless steel, and titanium, are mentioned. Among these, aluminum is preferably used. In the present invention, soft aluminum such as annealed aluminum (JIS A8021P-O) or (JIS A8079P-O) is used as the metal foil layer 33 in the present invention in order to prevent wrinkles and pin holes during the production of the packaging material. Is preferred.

  The thickness of the metal foil layer 33 is preferably about 10 to 200 μm, more preferably about 20 to 100 μm, from the viewpoint of making it difficult to generate pinholes even when the packaging material is thinned.

  From the viewpoint of further improving the electrolytic solution resistance of the packaging material 3, it is preferable to use the metal foil layer 33 subjected to chromate treatment.

  As the chromate treatment, for example, chromate chromate using a chromate compound such as chromium nitrate, chromium fluoride, chromium sulfate, chromium acetate, chromium oxalate, chromium biphosphate, chromium acetate, acetyl acetate, chromium chloride, potassium chromium sulfate and the like Treatment: Phosphoric acid chromate treatment using phosphoric acid compounds such as sodium phosphate, potassium phosphate, ammonium phosphate, polyphosphoric acid and the like; Aminated phenol having repeating units represented by the following general formulas (1) to (4) The chromate process etc. which used the polymer are mentioned. In the aminated phenol polymer, repeating units represented by the following general formulas (1) to (4) may be contained singly or in any combination of two or more. It is also good.

In the general formulas (1) to (4), X represents a hydrogen atom, a hydroxyl group, an alkyl group, a hydroxyalkyl group, an allyl group or a benzyl group. In addition, R ¹ and R ² are the same or different and each independently represent a hydroxyl group, an alkyl group or a hydroxyalkyl group. In the general formulas (1) to (4), examples of the alkyl group represented by X, R ¹ and R ² include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group and an isobutyl group, C1-C4 linear or branched alkyl groups, such as a tert- butyl group, are mentioned. Also, examples of the hydroxyalkyl group represented by X, R ¹ and R ² include, for example, hydroxymethyl group, 1-hydroxyethyl group, 2-hydroxyethyl group, 1-hydroxypropyl group, 2-hydroxypropyl group, 3- C1-C4 linear or branched one substituted with one hydroxy group such as hydroxypropyl, 1-hydroxybutyl, 2-hydroxybutyl, 3-hydroxybutyl, 4-hydroxybutyl and the like An alkyl group is mentioned. In the general formulas (1) to (4), the alkyl group and the hydroxyalkyl group represented by X, R ¹ and R ² may be identical to or different from each other. In the general formulas (1) to (4), X is preferably a hydrogen atom, a hydroxyl group or a hydroxyalkyl group. The number average molecular weight of the aminated phenol polymer having repeating units represented by the general formulas (1) to (4) is, for example, preferably 500 to 1,000,000, and more preferably about 1 to 20,000. preferable.

The amount of the acid resistant coating formed on the surface of the metal foil layer 33 in the chromate treatment is not particularly limited, but, for example, about 0.5 mg to about 0.5 mg of the chromic acid compound is converted to chromium per 1 m ² of the surface of the metal foil layer 33 50 mg, preferably about 1.0 mg to about 40 mg, about 0.5 mg to about 50 mg, preferably about 1.0 mg to about 40 mg, of the phosphorus compound, and about 1 mg to about 200 mg of the aminated phenolic polymer, preferably Is preferably contained in a proportion of about 5.0 mg to 150 mg.

  The chromate treatment is performed by applying a solution containing a compound used to form an acid-resistant film on the surface of the metal foil layer 33 by a bar coating method, a roll coating method, a gravure coating method, an immersion method, etc. The heating temperature is about 70.degree. C. to about 200.degree. In addition, before the metal foil layer 33 is subjected to chromate treatment, the metal foil layer 33 may be subjected in advance to degreasing treatment by an alkaline immersion method, an electrolytic cleaning method, an acid cleaning method, an electrolytic acid cleaning method or the like. By performing the degreasing treatment as described above, the chromate treatment of the surface of the metal foil layer 33 can be performed more efficiently.

  Furthermore, the metal foil layer 33 may be subjected to a chemical conversion treatment that imparts corrosion resistance as needed. Specifically, as a chemical conversion treatment method for imparting corrosion resistance to the metal foil layer 33, specifically, fine particles of metal oxide such as aluminum oxide, titanium oxide, cerium oxide, tin oxide or barium sulfate are dispersed in phosphoric acid And a baking treatment at 150 ° C. or higher to form a corrosion-resistant layer on the surface of the metal foil layer 33. In addition, a resin layer obtained by crosslinking the cationic polymer with a crosslinking agent may be further formed on the corrosion-resistant layer. Here, as the cationic polymer, for example, polyethylene imine, an ionic polymer complex composed of polyethylene imine and a polymer having a carboxylic acid, primary amine graft acrylic resin obtained by graft polymerizing a primary amine on an acrylic main skeleton, polyallylamine Or derivatives thereof, aminophenol and the like. As these cationic polymers, only 1 type may be used and you may use combining 2 or more types. Moreover, as a crosslinking agent, the compound which has an at least 1 sort (s) of functional group chosen from the group which consists of an isocyanate group, a glycidyl group, a carboxyl group, and an oxazoline group, a silane coupling agent etc. are mentioned, for example. As these crosslinking agents, only one type may be used, or two or more types may be used in combination.

1-3-4. Sealant layer>
In the packaging material 3, the sealant layer 34 corresponds to the innermost layer, and is a layer that thermally welds the sealant layers at the time of assembly of the battery to seal the battery element.

  The resin component used for the sealant layer 34 is not particularly limited as long as it can be heat-welded, and examples thereof include polyolefins, cyclic polyolefins, carboxylic acid modified polyolefins, and carboxylic acid modified cyclic polyolefins.

  Specific examples of the polyolefin include polyethylenes such as low density polyethylene, medium density polyethylene, high density polyethylene and linear low density polyethylene; homopolypropylene, block copolymers of polypropylene (for example, block copolymers of propylene and ethylene), polypropylene Crystalline or amorphous polypropylene such as a random copolymer of (e.g., a random copolymer of propylene and ethylene); a terpolymer of ethylene-butene-propylene; and the like. Among these polyolefins, preferably polyethylene and polypropylene are mentioned.

  The cyclic polyolefin is a copolymer of an olefin and a cyclic monomer, and as the olefin which is a constituent monomer of the cyclic polyolefin, for example, ethylene, propylene, 4-methyl-1-pentene, styrene, butadiene, isoprene, etc. Can be mentioned. Moreover, as a cyclic monomer which is a constituent monomer of the cyclic polyolefin, for example, cyclic alkenes such as norbornene; specifically, cyclic dienes such as cyclopentadiene, dicyclopentadiene, cyclohexadiene, norbornadiene, etc. may be mentioned. Among these polyolefins, preferred are cyclic alkenes, more preferably norbornene.

  The carboxylic acid-modified polyolefin is a polymer obtained by modifying the polyolefin with a carboxylic acid. Examples of the carboxylic acid used for modification include maleic acid, acrylic acid, itaconic acid, crotonic acid, maleic anhydride, itaconic anhydride and the like.

  The carboxylic acid-modified cyclic polyolefin is obtained by copolymerizing part of the monomers constituting the cyclic polyolefin with an α, β-unsaturated carboxylic acid or its anhydride, or by copolymerizing α, β to the cyclic polyolefin -A polymer obtained by block polymerization or graft polymerization of unsaturated carboxylic acid or its anhydride. The cyclic polyolefin to be carboxylic acid modified is the same as described above. Moreover, as a carboxylic acid used for modification | denaturation, it is the same as that used for modification | denaturation of the said acid-modified cycloolefin copolymer.

  Among these resin components, preferably crystalline or amorphous polyolefins, cyclic polyolefins, and blend polymers thereof; more preferably polyethylene, polypropylene, copolymers of ethylene and norbornene, and two or more of them And blend polymers of

  The sealant layer 34 may be formed of one type of resin component alone, or may be formed of a blend polymer in which two or more types of resin components are combined. Furthermore, the sealant layer 34 may be formed of only one layer, but may be formed of two or more layers of the same or different resin components.

  The thickness of the sealant layer 34 is not particularly limited, but may be about 2 to 2000 μm, preferably about 5 to 1000 μm, and more preferably about 10 to 500 μm.

  In the packaging material 3, an adhesive layer may be additionally provided as needed between the metal foil layer 33 and the sealant layer 34 in order to bond the sealant layer 34 firmly.

  This additional adhesive layer is formed by an adhesive capable of adhering the metal foil layer 33 and the sealant layer 34. Although it does not restrict | limit in particular about the composition of the adhesive agent used for formation of this adhesive layer, For example, the resin composition containing a thermosetting resin is mentioned. About the specific example of the thermosetting resin used for this contact bonding layer, it is the same as that of what was illustrated with the contact bonding layer 32 mentioned above.

  The thickness of the adhesive layer is, for example, about 1 to 40 μm, preferably about 2 to 30 μm.

<2. Battery holder>
Next, the battery holder will be described with reference to FIG. FIG. 4 is a plan view (a) and a cross-sectional view (b) of the battery holder. As shown to the same figure, the battery container 10 accommodates the battery 1 mentioned above, and is provided with the container 5 and the some battery 1 (this example four pieces) accommodated in this. ing. However, the number of batteries 1 to be accommodated is not particularly limited, and may be one or more.

  The container 5 may have various modes as long as it can seal the battery 1 and can be partially opened afterward. For example, as shown in FIG. 4, the same material as the packaging material 3 of the battery 1 described above can be used as the container 5 by sealing the peripheral portion 50 by heat sealing. In addition, when the container 5 is made of such a material, it is possible to cut a part later or open the heat-sealed peripheral portion 50 for opening.

<3. Battery manufacturing method>
Next, a method of manufacturing the battery configured as described above will be described. The manufacturing process of the battery mainly includes, as shown in FIG. 5, (1) accommodation of the battery element in the packaging material, (2) conditioning to perform charge and discharge, (3) accommodation of the battery in the container, (4) Aging including storage of the battery case, and (5) an inspection step of inspecting a sealing failure of the packaging material and the like. Therefore, in the battery manufacturing system according to the present embodiment, as shown in FIG. 6, at least a battery forming unit performing the process of (1), a conditioning unit performing the process of (2), and a process of (3) The battery container formation part, the storage part which performs the process of (4), and the test | inspection part which performs the process of (5) are provided. Below, the manufacturing process and aging process ((1)-(4)) of a battery container are demonstrated first, and a test process (5) is demonstrated after that.

<3-1. Manufacturing process of battery holder and aging process>
First, the battery element 4 is accommodated in the packaging material 3 described above. There are various methods, for example, first, a recess is formed by cold forming in a rectangular sheet material for a pair of packaging materials. Next, by welding three sides of the peripheral portion of the sheet material by heat sealing, the bag-like packaging material 3 in which one side is opened and the internal space is formed is formed. Subsequently, the battery element 4 is inserted into the internal space from one side of the opening of the packaging material 3. At this time, as described above, the metal terminal 2 is made to project from the opening of the packaging material 3. Finally, the opened side of the packaging material 3 is heat sealed and sealed. At this time, since the sheet material is heat-sealed in a state in which the metal terminal 2 is sandwiched, the metal terminal 2 is fixed to the sheet material. Thus, the battery 1 in which the battery element 4 is accommodated is formed.

  In addition, the accommodation method of the battery element 4 is not specifically limited, For example, the sheet material for packaging materials of 1 sheet is folded in two, and heat sealing is given to two peripheral parts which oppose among four peripheral parts. Thereby, the packaging material 3 which one side opened among four peripheral parts is formed. The method of housing the battery element 4 thereafter is the same as that described above.

  Next, the battery 1 formed as described above is subjected to one or more times of charging, that is, so-called conditioning processing. The charging may be performed only once or, for example, may be repeated twice or more while the discharge is interposed.

  Subsequently, the battery 1 is accommodated in the container 5 to form the battery container 10. Since the method of accommodation is the same as the method of accommodation of the battery element 4 in the packaging material 3, the detailed description is omitted here.

  Subsequently, the battery container 10 is stored in the storage space for a predetermined time while maintaining the charge state. This is a so-called aging process, which is a process for sufficiently impregnating the electrode with the electrolyte in the battery element 4. Although the storage time varies depending on the mode of the battery, for example, it is preferably 2 to 48 hours, and more preferably 5 to 24 hours. The temperature of the storage space may be normal temperature or may be higher than normal temperature. When the temperature is higher than normal temperature, the storage time can be shortened. For example, the storage temperature is preferably 20 to 85 ° C, and more preferably 20 to 60 ° C. When the storage temperature is 20 to 60 ° C., the storage time can be shortened by 20 to 50% as compared to the storage time at normal temperature.

  In this process, when pinholes are generated in the packaging material 3, the electrolyte component leaks out as gas from the pinholes, and the electrolyte component is accumulated in the container 5. In addition, even when no pinholes occur, the electrolyte component may leak from the peripheral portion 30 of the packaging material 3. That is, the electrolyte component may leak from the heat sealed peripheral portion 30 through the welded portion. In particular, if the welding of the peripheral portion 30 is insufficient due to the poor heat seal, the amount of leakage of the electrolyte component may increase. For example, as shown in FIG. 7 (a), as compared with the case where the heat seal is properly applied, as shown in FIG. 7 (b), the unsealed portion not sealed in the peripheral portion 30 due to the defective heat seal. In the case of having a region, the electrolyte component tends to leak out, resulting in a large amount of leakage.

  Thus, in this step, the electrolyte component of the battery element 4 leaks from the packaging material 3 and is accumulated in the container 5 by storing the battery container 10 for a predetermined time. Here, when the storage temperature is increased during storage, the internal pressure of the packaging material 3 is increased, so that the electrolyte component is more likely to leak.

<3-2. Inspection process>
Next, the inspection process will be described. In this inspection step, it is inspected whether or not the packaging material 3 of the battery 1 is properly sealed, or whether or not a pinhole has occurred. Specifically, an electrolyte component leaked from the packaging material 3 is detected, and if the detected amount exceeds a predetermined value, it is determined that the sealing material of the packaging material 3 is defective or a pinhole is generated. In the following, first, an inspection apparatus will be described, and then an inspection method will be specifically described.

<3-2-1. Inspection device>
An inspection apparatus according to the present embodiment will be described with reference to FIG. The inspection apparatus 8 according to the present embodiment has an inspection chamber (inspection space) 81 for housing the battery container 10 to be inspected. The inspection chamber 81 is sealed by closing a door (not shown). Be done. A suction pipe 82 extending to the outside is connected to the inspection chamber 81, and the suction pipe 82 is connected to a vacuum pump 83 installed outside the inspection chamber 81. Therefore, when the vacuum pump 83 is driven, the inside of the inspection chamber 81 is decompressed. Further, the inspection chamber 81 is provided with a detection unit 84 for detecting an electrolyte component. The detection unit 84 can be constituted by, for example, a gas inlet and a well-known gas sensor installed inside the inlet, and when the electrolyte component as the inspection object adheres to the gas sensor, electricity is detected. By measuring the change in conductivity, the amount of the inspection object can be detected.

  Further, the vacuum pump 83 and the gas sensors of the detection unit 84 are connected to a control device (not shown) configured by a computer or the like, and controls driving of the vacuum pump 83 and measurement of the inspection object by the detection unit 84 .

3-2-2. Inspection method>
Then, the inspection method of the leak of the electrolyte component using the said test | inspection apparatus 8 is demonstrated. First, the battery housing 10 is stored in the inspection chamber 81 after the battery housing 10 that has undergone the storage process is partially opened. At this time, a part of the container 5 may be cut or the heat sealed peripheral portion 50 may be opened. However, in order to conduct the inspection correctly, immediately after the container 5 is opened, the battery container 10 is accommodated in the inspection chamber 81, and the door is closed and sealed. In this state, the opened battery container 10 is accommodated in the inspection chamber 81, and when it is opened, when the electrolyte component leaks from the battery, it is accumulated in the container 5 The electrolyte component is ready to flow into the inspection chamber 81.

  Next, the vacuum pump 83 is driven to decompress the inspection chamber 81. The depressurization can be performed by various methods. For example, the depressurization to leak the electrolyte component necessary for the inspection from the battery container 10 to the inspection chamber 81 is performed first. As a result, a pressure difference is generated between the inner space of the container 5 and the inspection chamber 81, so the electrolyte component accumulated in the container 5 leaks out through the unsealing part and flows out into the inspection chamber 81. Then, after the inside of the inspection chamber 81 reaches a predetermined pressure, the degree of pressure reduction is switched to perform pressure reduction for inspection. That is, the pressure reduction for sucking the electrolyte component is performed in the detection unit 84, whereby the detection of the electrolyte component is performed in the detection unit 84. In this method, the first predetermined time after the start of the test is performed to reduce the pressure for flowing the electrolyte component into the test chamber 81 in order to satisfy the conditions of the test, and thereafter detecting the detection of the leaked electrolyte component Apply a vacuum to lead to 84.

  Then, if the detected amount of the electrolyte component detected by the detection unit 84 exceeds the predetermined amount, there is a possibility that a pinhole or a seal failure occurs in the packaging material 3 of the battery 1. In the present embodiment, since the plurality of batteries 1 are accommodated in the container 5, there is a possibility that any one of the batteries 1 is defective if the detected amount of the electrolyte component exceeds the predetermined amount. There is. Therefore, in order to identify the battery 1 in which the failure has occurred, the batteries 1 may be re-inspected individually by the inspection device. Alternatively, the battery holder 10 can be disposed of together. The reference value for determining the defect can be appropriately set according to the type of the battery element 4, the type of the packaging material 3, the number of the batteries 1 in the container 5, and the like. For example, a plurality of reference values can be set, such as a reference value for a pinhole and a reference value for a seal failure. In addition, when the pinhole has arisen, it is thought that the leakage amount of an electrolyte component is larger than seal | sticker defect.

  If no defect is found in the inspection, the battery 1 may be taken out of the container 5 and shipped, or may be shipped without being taken out of the container 5 as it is. Thus, the manufacture of the battery is completed.

<3. Feature>
As described above, according to the present embodiment, after the battery 1 is accommodated in the container 5 and stored for a predetermined time, leakage of the electrolyte component is detected in the inspection chamber 81. On the other hand, for example, when the battery 1 is directly disposed in the inspection device 8 and the leakage of the electrolyte component is inspected, the inspection may take time. That is, as described above, in the inspection apparatus 8, the time required for the pressure reduction for causing the electrolyte component to leak from the packaging material 3 to the inspection chamber 81 becomes long.

  Therefore, in the present embodiment, the battery container 10 in which the battery 1 is housed in the container 5 is formed and stored for a predetermined time. Therefore, if there is leakage of the electrolyte component from the battery 1, the container is stored during storage. Electrolyte components accumulate in 5. Therefore, when the battery container 10 after storage is placed in the inspection device 8 and opened, the electrolyte component accumulated in the container 5 flows into the inspection chamber 81, so that the electrolyte component can be detected in a short time. . Therefore, it is possible to shorten the pressure reduction time for satisfying the inspection condition described above. As a result, the time required to check for leakage of the electrolyte component can be significantly reduced.

  In particular, when the storage temperature is kept higher than the normal temperature in the process of storing the battery container 10, the internal pressure of the packaging material 3 is increased, and the leakage amount of the electrolyte component is increased. Therefore, if the storage temperature is increased, the amount of leakage of the electrolyte component in the case where a defect occurs is increased, and the inspection time can be further shortened.

  Further, in the above embodiment, since the plurality of batteries 1 are accommodated in the container 5, defects in the plurality of batteries 1 can be determined at one time. Therefore, the inspection time can be shortened.

  Furthermore, in the manufacture of the battery 1, the above-described aging step is generally performed, so the aging step can be used as a storage time for storing the electrolyte component in the battery container 10. Therefore, it is not necessary to separately provide a storage process, and also from this viewpoint, the manufacturing time can be shortened.

<4. Modified example>
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible unless it deviates from the meaning.

<4-1>
In the said embodiment, although the packaging material 3 is formed with the flexible material formed with the sheet material, it is not limited to this. For example, the manufacturing method according to the present invention can be applied to a packaging material formed of a rigid material having no flexibility, such as metal or rigid resin material. That is, even if it is a hard packaging material, if there is a sealing failure, the electrolyte component may leak from the packaging material, and in particular if the defective portion is small, it may take time for the leakage. In such a case, it is particularly advantageous to apply the manufacturing method according to the present invention.

<4-2>
In the said embodiment, although the container 5 is formed with the same material as a packaging material, it is not limited to this. That is, the container can also be formed of a hard material having no flexibility, such as metal or hard resin material. Various materials can be used as long as the battery can be sealed at least and can be opened afterward. Further, the metal terminal 2 protruding from the battery 1 can be extended and can be protruded from the container 5 so that the battery container 10 can be used as it is.

<4-3>
In the above embodiment, when the battery container 10 is accommodated in the inspection device 8, the container 5 is opened, but the container 5 can be configured as follows. That is, the container 5 is provided with an unsealing portion which is opened by a pressure difference such as a valve. As a result, if the pressure in the inspection chamber 81 is reduced after housing the battery container 10 in the inspection chamber 81, a pressure difference occurs between the inside and the outside of the container 5, and the unsealing unit is automatically opened. Therefore, if such a container 5 is used, the manual opening operation of the container 5 becomes unnecessary. The configuration of the unsealing part is not particularly limited, and in addition to using a well-known valve, a through hole is formed in the container 5, and the through hole is covered with a lid by heat sealing so as to open when a pressure difference occurs. It can be closed.

<4-4>
In the above-mentioned inspection process, after disposing the battery container 10 in the inspection chamber 81, the inside of the inspection chamber 81 is depressurized. That is, if the electrolyte component leaks sufficiently into the container 5 at the time of storage of the battery container 10, the electrolyte component flows into the inspection chamber 81 when the container 5 is opened, even if the pressure is reduced. Therefore, the electrolyte component can be detected immediately. However, as described above, in the case where the container 5 is provided with the opening unit that automatically opens the container 5 due to the pressure difference, the inside of the inspection chamber 81 needs to be decompressed.

<4-5>
The inspection apparatus 8 which concerns on the said embodiment is an example, and if it can detect the quantity of the electrolyte component which flows into a test chamber and can be pressure-reduced as needed, it will not be specifically limited.

  Examples according to the present invention will be described below. However, the present invention is not limited to the following examples.

In order to examine the inspection method of the battery according to the present invention, a test was conducted as follows.
1. The battery 1 and the battery 2 were produced for the structural test of a battery. Specifically, a dummy cell containing an electrolytic solution was accommodated in a packaging material having the following specifications, and the peripheral portion was sealed. In the battery 1, it is assumed that the seal of the peripheral portion of the packaging material is not defective. On the other hand, the battery 2 is judged to be defective because the seal of the peripheral portion of the packaging material is insufficient and air bubbles are generated inside the peripheral portion.
(1) Battery 1
· Dimensions of packaging material: 55 mm × 33 mm
・ Sealing width of peripheral part: 5 mm
・ Molding depth: 3 mm
Sealing conditions: temperature 170 ° C., pressure 0.5 MPa, sealing time 5 seconds (2) Battery 2
· Dimensions of packaging material: 55 mm × 33 mm
・ Sealing width of peripheral part: 5 mm
・ Molding depth: 3 mm
Sealing conditions: Temperature 150 ° C, pressure 0.2MPa, sealing time 3 seconds

・ Packaging material:
On the base material layer which consists of a nylon film (15 micrometers in thickness), the metal layer which consists of aluminum foil (30 micrometers in thickness) which performed the chemical conversion treatment on both surfaces was laminated by the dry lamination method. Specifically, a two-component urethane adhesive (polyol compound and aromatic isocyanate compound) was applied to one surface of an aluminum foil to form an adhesive layer (3 μm in thickness) on the metal layer. Then, the adhesive layer on the metal layer and the base material layer are bonded by pressure heating (sand lamination), and then aging treatment is performed at 40 ° C. for 24 hours, thereby laminating the base material layer / adhesion layer / metal layer I created a body. In addition, the chemical conversion treatment of the aluminum foil used as the metal layer is carried out by roll coating such that the coating amount of chromium is 10 mg / m ² (dry weight) of a treatment liquid comprising a phenol resin, a chromium fluoride compound and phosphoric acid. It apply | coated on both surfaces of the aluminum foil by the method, and carried out by baking for 20 seconds on the conditions which become the film | membrane temperature 180 degreeC or more. Next, the adhesive layer / sealant layer is laminated on the metal layer by coextrusion of 20 μm of carboxylic acid-modified polypropylene (arranged on the metal layer side) and 20 μm of random polypropylene (innermost layer) on the metal layer of the laminate. , Produced a packaging material.

Electrolyte solution: 3 g of a mixed solution of ethylene carbonate, diethyl carbonate and dimethyl carbonate (1: 1: 1) adjusted to 1 M LiPF ₆

2. Structure of Containment Tool In order to accommodate each of the five batteries described above, a plastic container having dimensions of 100 mm × 70 mm × 60 mm and an open top was prepared. And the plastic container which accommodated the battery was accommodated in the container which concerns on this invention. As a container, an aluminum laminate film formed in a bag shape was used, and after a plastic container was housed, it was sealed by heat sealing. This film has a four-layer structure, ie, a film in which polyethylene terephthalate, thickness 9 μm / aluminum foil, thickness 13 μm / acid-modified polypropylene, thickness 14 μm / polypropylene, and thickness 10 μm are laminated in this order. The plastic container is used to keep the volume in the container constant.

3. Inspection device manufactured by oneA Co., Ltd. Electrolyte leakage test device LC-B1

4. The following four were prepared as inspection targets.
Sample 1: Five batteries 1 were housed in a plastic container, which was then housed in a container and sealed (battery container)
Sample 2: Five batteries 2 were housed in a plastic container, then housed in a container and sealed (battery container)
Sample 3: only battery 1 Sample 4: only battery 2

5. Inspection Method (1) Method of Example Samples 1 and 2 are stored in a storage space as an aging process. The temperature of the storage space was 60 ° C., and the storage time was 24 hours. Thereafter, the samples 1 and 2 were taken out of the storage space, and after making holes in the container with a needle, the samples were put into the inspection device. Then, the amount of leaked electrolyte was measured, and determination of leak detection was made, and the time required for the determination was recorded.
(2) Method of Comparative Example The samples 3 and 4 are stored in a storage space as an aging process. The temperature of the storage space was 60 ° C., and the storage time was 24 hours. Thereafter, the samples 3 and 4 were taken out of the storage space, respectively, and put into the inspection device. Then, the amount of leaked electrolyte was measured, and determination of leak detection was made, and the time required for the determination was recorded.

6. The test results are as follows.
Sample 1: No detection of leak, time to detection (time to judge no leak) 120 seconds Sample 2: Detection of leak, time to detection 10 seconds Sample 3: No detection of leak, Time to detection (time to judge that there is no leak) 120 seconds Sample 4: Detection of leak, time to detection 30 seconds

  For the samples 2 and 4 with seal defects, the method of the example for the sample 2 was able to detect leakage in a shorter time than the method of the comparative example for the sample 4. On the other hand, the time to detection was the same for samples 1 and 3 without a seal failure, because there was no electrolyte leakage from samples 1 and 3. That is, since it is time until it judges that there is no leak, all are the same time. As mentioned above, it turned out that leak of electrolyte can be detected in a short time, if a method concerning an example is used.

1: Battery 3: Packaging material 4: Battery element 5: Containment tool 10: Battery containing body

Claims (8)

Providing a container at least partially configured to be openable;
Forming at least one battery formed by accommodating and sealing a battery element containing an electrolyte in a packaging material in the container and forming a battery container;
Storing the battery container for a predetermined time;
Placing and unsealing the battery container in a test space and checking for leakage of electrolyte component from the container;
A method of manufacturing a battery, comprising: Preparing a container having an opening part which is opened by a pressure difference between the internal space and the outside;
Forming at least one battery formed by accommodating and sealing a battery element containing an electrolyte in a packaging material in the container and forming a battery container;
Storing the battery container for a predetermined time;
Placing the battery container in an examination space and decompressing the examination space, thereby opening the unsealing part and examining leakage of the electrolyte component from the container;
A method of manufacturing a battery, comprising:   The method for manufacturing a battery according to claim 1, wherein the storage temperature is set to 20 to 85 ° C. in the step of storing the battery housing for a predetermined time.   The method for manufacturing a battery according to any one of claims 1 to 3, wherein a plurality of the batteries are accommodated in the container.   The packaging material of the battery is formed of a sheet-like material formed of at least one layer of material, and the battery is formed by sealing the battery element in the sheet-like material, thereby forming the battery. The manufacturing method of the battery in any one of 4. A battery forming portion for forming a battery in which a battery element containing an electrolyte is contained in a packaging material and sealed;
A battery container forming portion that forms a battery container by accommodating and sealing at least one of the batteries in a container at least a part of which is configured to be openable;
A storage unit for storing the battery container for a predetermined time;
An inspection unit having an inspection space for accommodating the battery container taken out from the storage unit, and inspecting a leak of an electrolyte component from a container of the battery container;
The battery manufacturing system is equipped with. Preparing a battery container formed by housing and sealing at least one battery in which a battery element containing an electrolyte is housed and sealed in a packaging material at least a part of which is configured to be openable; ,
Storing the battery container for a predetermined time;
Placing and unsealing the battery container in a test space and checking for leakage of electrolyte component from the container;
How to inspect the battery. A battery container formed by storing and sealing at least one battery in which a battery element containing an electrolyte is contained in a packaging material and sealed, in a container having an opening portion for opening by a pressure difference between an internal space and the outside Step of preparing
Storing the battery container for a predetermined time;
Placing the battery container in an examination space and decompressing the examination space, thereby opening the unsealing part and examining leakage of the electrolyte component from the container;
How to inspect the battery.

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