Classifications

• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
  • Y02E60/10—Energy storage using batteries

Definitions

• This disclosure relates to an inner bag film for a semi-solid battery and a semi-solid battery.
• exterior materials are essential components for sealing the electricity storage device elements, such as the electrodes and electrolyte.
• metal exterior materials have been widely used as exterior materials for electricity storage devices.
• a film-like laminate in which a base layer, a barrier layer, an adhesive layer, and a heat-sealable resin layer are laminated in this order has been proposed as an exterior material for an electricity storage device that can be easily processed into a variety of shapes and can be made thin and lightweight (see, for example, Patent Document 1).
• recesses are generally formed by cold forming, electricity storage device elements such as electrodes and electrolyte are placed in the space formed by the recesses, and the heat-sealable resin layer is heat-sealed to obtain an electricity storage device in which the electricity storage device elements are housed inside the exterior material for electricity storage devices.
• Semi-solid batteries that use semi-solid electrodes are known as power storage devices (see Patent Document 2).
• Semi-solid batteries use semi-solid electrodes that have fluidity, and the electrodes tend to lose their shape when dried. For this reason, in semi-solid batteries, the battery element is kept in its shape by an exterior material (packaging).
• Patent Document 2 discloses a semi-solid battery (electrochemical cell) that includes a power generating element that includes a semi-solid positive electrode, a semi-solid negative electrode, a separator located between the positive electrode and the negative electrode, a positive electrode current collector electrically connected to the positive electrode, and a negative electrode current collector electrically connected to the negative electrode, and a packaging body that contains the power generating element, the packaging body having holes that open to the inside and outside.
• each cell can have its battery element housed in an inner bag, and these cells can be further housed in a package.
• the cells may move in the package when the semi-solid battery is in use, and the cells and the package may be damaged. Therefore, it is desirable to fix the cells together in the package.
• the inventors of the present invention thought that in order to fix multiple cells together, it would be effective to use an inner bag film to form the inner bag, impart heat fusion properties to the base material that constitutes the outside of the inner bag film, and heat fusion the outsides of the inner bags together, and set a new problem of imparting heat fusion properties to the base material of the inner bag film.
• recesses are generally formed by cold forming, electricity storage device elements such as electrodes and electrolyte are placed in the space formed by the recesses, and the heat-sealable resin layer is heat-sealed to obtain an electricity storage device in which the electricity storage device elements are housed inside the exterior material for electricity storage devices.
• the inner bag film is also required to have excellent formability.
• the main objective of the present disclosure is to provide a novel inner bag film that is placed between the exterior material and the battery element of a semi-solid battery, in which the base materials of the inner bag film can be easily heat-sealed together and which has excellent formability.
• the inventors of the present disclosure conducted intensive research to solve the above problems. As a result, they discovered that in an inner bag film for a semi-solid battery, which is placed between the exterior material of the semi-solid battery and the battery element, the inner bag film is composed of a laminate including at least a base material and an adhesive layer, and the base material contains polyolefin, so that the base materials of the inner bag film can be easily heat-sealed to each other and that the moldability is excellent.
• the base materials of the inner bag film can be easily heat-sealed to each other, they discovered that, for example, by preparing multiple cells containing battery elements of a semi-solid battery in an inner bag formed by the inner bag film and heat-sealing the base materials of the inner bag located on the outside of each cell to each other, the multiple cells can be fixed by heat sealing in the package.
• An inner bag film for a semi-solid battery which is disposed between an exterior material of the semi-solid battery and a battery element
• the inner bag film for a semi-solid battery is composed of a laminate including at least a substrate and an adhesive layer,
• the present disclosure it is possible to provide a novel inner bag film that is disposed between the exterior material and the battery element of a semi-solid battery, and that allows the base materials of the inner bag film to be easily heat-sealed together and has excellent formability. Furthermore, according to the present disclosure, it is also possible to provide a semi-solid battery that utilizes the inner bag film.
• FIG. 2 is a schematic diagram showing an example of a cross-sectional structure of a packaging film for a semi-solid battery according to the present disclosure.
• FIG. 2 is a schematic diagram showing an example of a cross-sectional structure of an exterior material used in the semi-solid battery of the present disclosure.
• FIG. 1 is a schematic diagram showing an example of a cross-sectional structure of a semi-solid battery according to the present disclosure.
• the inner bag film for semi-solid batteries disclosed herein is an inner bag film for semi-solid batteries that is disposed between the exterior material of the semi-solid battery and the battery element, and is composed of a laminate including at least a base material and an adhesive layer, and is characterized in that the base material contains polyolefin.
• the inner bag film for semi-solid batteries disclosed herein can easily heat-seal the base materials of the inner bag film together, and has excellent formability.
• the numerical range indicated by “ ⁇ ” means “greater than or equal to” or “less than or equal to.”
• the expression 2 to 15 mm means 2 mm or more and 15 mm or less.
• the upper limit or lower limit described in a certain numerical range may be replaced with the upper limit or lower limit of another numerical range described in stages.
• the upper limit and upper limit, the upper limit and lower limit, or the lower limit and lower limit described separately may be combined to form a numerical range.
• the upper limit or lower limit described in a certain numerical range may be replaced with a value shown in the examples.
• semi-solid refers to a material that is a mixture of a liquid phase and a solid phase, such as a particle suspension, a colloidal suspension, an emulsion, a gel, or a micelle, and a semi-solid battery uses semi-solid electrodes.
• Inner bag film for semi-solid battery The inner bag film for semi-solid battery of the present disclosure is composed of a laminate including at least a substrate and an adhesive layer. Furthermore, the substrate includes polyolefin. That is, the inner bag film for semi-solid battery of the present disclosure is a laminate film including at least a substrate including polyolefin and an adhesive layer. As shown in the schematic diagram of FIG. 3, the inner bag film for semi-solid battery 1 of the present disclosure is disposed between the exterior material 3 and the battery element 4 of the semi-solid battery 10.
• multiple cells can be connected to form a module (battery assembly), which can then be housed in a package to create a single large semi-solid battery.
• a module battery assembly
• multiple cells are housed in the package, so it is desirable to fix the multiple cells together.
• recesses are generally formed by cold forming, and electricity storage device elements such as electrodes and electrolyte are placed in the space formed by the recesses, and the heat-sealable resin layer is heat-sealed to obtain an electricity storage device in which the electricity storage device elements are housed inside the exterior material for electricity storage devices.
• the inner bag film is also required to have excellent formability.
• the inner bag film disclosed herein uses a polyolefin substrate, which has heat-sealing properties and excellent formability, allowing the substrates to be fixed together by heat fusion, and also has excellent formability.
• the battery element 4 is housed in an inner bag formed by an inner bag film 1, and the inner bag housing the battery element 4 is housed in a package formed by an exterior material 3. It is preferable that the battery element 4 has a structure in which it is sealed (hermetically sealed) by the inner bag film 1. It is also preferable that the battery element 4 and the packaging film 1 have a structure in which they are sealed (hermetically sealed) by the exterior material 3. That is, in the semi-solid battery 10, it is preferable that the battery element 4 has a structure in which it is doubly sealed by the inner bag film 1 and the exterior material 3.
• the battery element 4 can be covered with the inner bag film 1, and the flange portion of the inner bag film 1 can be heat-sealed to hermetically seal the battery element 4 within the inner bag. Furthermore, the inner bag with the battery element 4 sealed therein can be covered with the exterior material 3, and the flange portion of the exterior material 3 can be heat-sealed to hermetically seal the inner bag within the package.
• the semi-solid battery 10 may be a package in which multiple inner bags containing the battery elements 4 are housed.
• at least some of the multiple inner bags containing the battery elements 4 can be fixed together by heat sealing.
• at least two inner bags can be fixed together by heat sealing the base materials 11 of the inner bag film 1 that constitutes the inner bag.
• the position at which the packages are heat sealed together and examples include the peripheral edge 30a of the inner bag, the upper surface of the inner bag, and the lower surface of the inner bag.
• the battery element 4 is covered with the inner bag film 1 to form each cell 30. Furthermore, a plurality of cells 30 are covered with the exterior material 3.
• the inner bag (cell 30) containing the battery element 4 is covered with the exterior material 3 so that a flange portion (peripheral portion 3a of the exterior material 3) of the exterior material 3 is formed near the periphery of the inner bag (cell 30) containing the battery element 4, and the flange portion of the exterior material 3 is heat-sealed to form a package containing the inner bag (cell 30).
• the inner bag containing the battery element 4 can be the cell 30.
• the use of the inner bag film 1 of the present disclosure is not limited to the inner bag of the cell (single cell), and there is no particular limit to the use of the inner bag film 1 as long as it is placed between the exterior material 3 and the battery element 4 of the semi-solid battery 10.
• the semi-solid battery 10 shown in the schematic diagram of FIG. 3 two cells 30 are housed in a package formed by an exterior material 3, and in each cell 30, the battery element 4 is housed in an inner bag formed by an inner bag film 1.
• the number of cells in the package may be two or more, and for example, 2 to 20 cells are housed in the package.
• each inner bag is composed of two inner bag films 1.
• the adhesive layers 12 of the two inner bag films 1 are bonded together at the flange portion 30a, thereby sealing the battery element 4 in the inner bag.
• the inner bag may be composed of one inner bag film, or two or more inner bag films.
• the cells 30 are fixed together by heat sealing the base material 11 of the inner bag film 1 that constitutes the outer surface of the inner bag at the flange portion of the inner bag (the peripheral portion 30a of the inner bag).
• the inner bag film 1 is used with the adhesive layer 12 (described later) facing inward (the surface in contact with the battery element 4).
• the exterior material 3 is used with the heat-sealable resin layer 35 (described later) facing inward (the surface in contact with the inner bag film 1).
• FIG. 3 shows a schematic diagram of an electrode 40 connected from the battery element 4 to the metal terminal 2.
• An adhesive film 21 for the metal terminal can be disposed between the metal terminal 2 and the exterior material 3. By disposing the adhesive film 21 for the metal terminal, the adhesion between the metal terminal 2 and the heat-sealable resin layer 35 of the exterior material 3 can be improved.
• the inner bag film 1 (the adhesive layer 12) can be adhered to the electrode 40, and at the position where the electrode 40 is not present, the inner bag films 1 (the adhesive layers 12) can be adhered to each other.
• the adhesive layer 12 has adhesive properties to metal.
• the exterior material 3 (the heat-sealable resin layer 35) can be adhered to the metal terminal 2 via the adhesive film 21 for metal terminal, and at the position where the metal terminal 2 is not present, the exterior material 3 (the heat-sealable resin layer 35) can be adhered to each other.
• the end of the inner bag film 1 (at least a part of the peripheral portion 30a (flange portion) of the inner bag) may be located at the flange portion of the exterior material 3 (peripheral portion 3a of the exterior material 3).
• the inner bag may be arranged so that the end of the inner bag film 1 is present at least a part of the position where the heat-sealable resin layers 35 of the exterior material 3 are heat-sealed to each other and/or at least a part of the position where the heat-sealable resin layer 35 of the exterior material 3 is adhered to the metal terminal 2. With such an arrangement, it is possible to heat-seal the base material 11 of the inner bag film 1 and the heat-sealable resin layer 35 of the exterior material 3 to further firmly fix the inner bag.
• the adhesive layer 12 of the inner bag film 1 has heat fusion properties. It is also preferable that the adhesive layers 12 of the inner bag film 1 have heat fusion properties with each other. Also, as mentioned above, it is preferable that the adhesive layer 12 of the inner bag film 1 has adhesion to metal.
• the inner bag film 1 for a semi-solid battery of the present disclosure is composed of two or more layers, for example as shown in Figure 1.
• Figure 1 shows a schematic cross-sectional view of the inner bag film 1 for a semi-solid battery composed of a laminate in which a base material 11 arranged on the exterior material 3 side and an adhesive layer 12 arranged on the battery element 4 are laminated.
• the inner bag film 1 When the inner bag film 1 is composed of two or more layers, at least one of the two or more layers is a substrate 11 and at least one is an adhesive layer 12.
• the substrate 11 constitutes one side of the surface of the inner bag film 1
• the adhesive layer 12 constitutes the other side of the surface of the inner bag film 1.
• the inner bag film 1 is preferably composed of two to four layers, more preferably two to three layers, and even more preferably two layers.
• gases such as CO2 are generated from the battery element during the initial charge/discharge process, aging process, etc.
• a semi-solid electrode having fluidity is used, and the electrode is easily deformed when dried.
• the battery element is housed in an exterior material (packaging body), and the initial charge/discharge process, aging process, etc. are performed while the battery element is in a shape-retaining state.
• the initial charge/discharge process and aging process are performed while the battery element is housed in an exterior material (packaging body), it is necessary to take measures such as providing a hole in the packaging body to release the generated gas.
• the polyolefin contained in the base material of the inner bag film of the present disclosure has excellent CO2 permeability, which makes it possible to suitably release CO2 gas generated from the battery element housed in the inner bag film (more specifically, the battery element housed in the inner bag formed by the inner bag film) to the outside.
• the inner bag film for a semi-solid battery 1 of the present disclosure has a CO2 permeability at a temperature of 23°C and a relative humidity of 0% RH for 24 hours of preferably about 6,000 cc/ m2 or more, more preferably about 8,000 cc/m2 or more , and even more preferably about 10,000 cc/m2 or more .
• the upper limit of the CO2 permeability is, for example, about 30,000 cc/ m2 or about 20,000 cc/ m2 .
• Preferred ranges of the CO2 permeability are about 6,000 to 30,000 cc/ m2 , about 6,000 to 20,000 cc/ m2 , about 8,000 to 30,000 cc/ m2 , about 8,000 to 20,000 cc/m2, and about 10,000 to 30,000 cc/m2. 2 , and 10,000 to 20,000 cc/ m2 .
• the thickness (total thickness) of the inner bag film 1 for semi-solid batteries of the present disclosure is preferably 7 ⁇ m or more, more preferably 10 ⁇ m or more, and even more preferably 15 ⁇ m or more, and is preferably 30 ⁇ m or less, more preferably 25 ⁇ m or less, and even more preferably 20 ⁇ m or less, and preferred ranges include about 7 to 30 ⁇ m, about 7 to 25 ⁇ m, about 7 to 20 ⁇ m, about 10 to 30 ⁇ m, about 10 to 25 ⁇ m, about 10 to 20 ⁇ m, about 15 to 30 ⁇ m, about 15 to 25 ⁇ m, and about 15 to 20 ⁇ m.
• the inner bag film 1 for a semi-solid battery of the present disclosure is preferably not provided with holes for gas permeation. This is because the inner bag film 1 of the present disclosure has excellent CO2 permeability, so there is no need to provide such holes, and if the inner bag in the semi-solid battery 10 has holes, water vapor will easily penetrate from the outside.
• the inner bag film 1 does not have a metal layer. This is because the presence of a metal layer even in a part of the inner bag film 1 inhibits CO2 permeability.
• the metal layer means a layer formed of a metal, and examples thereof include a metal foil and a metal plate, and the thickness of the metal foil is, for example, about 10 to 200 ⁇ m, and the thickness of the metal plate is, for example, about 200 ⁇ m to several mm.
• the inner bag film 1 for semi-solid batteries can contain various plastic compounding agents and additives, for example, for the purpose of improving or modifying processability, heat resistance, weather resistance, mechanical properties, dimensional stability, oxidation resistance, slipperiness, release properties, flame retardancy, mold resistance, electrical properties, strength, etc.
• the content can be any amount depending on the purpose, ranging from extremely small amounts to several tens of percent.
• typical additives that can be contained include, for example, antiblocking agents, lubricants, crosslinking agents, antioxidants, UV absorbers, light stabilizers, fillers, reinforcing agents, antistatic agents, pigments, modifying resins, etc.
• the base material 11 contained in the inner bag film 1 contains a polyolefin.
• the base material 11 may contain only one type of polyolefin, or may contain two or more types of polyolefin.
• polyolefins include polyethylenes such as low-density polyethylene, medium-density polyethylene, high-density polyethylene, and linear low-density polyethylene; ethylene- ⁇ -olefin copolymers; polypropylenes such as homopolypropylene, block copolymers of polypropylene (e.g., block copolymers of propylene and ethylene), and random copolymers of polypropylene (e.g., random copolymers of propylene and ethylene); propylene- ⁇ -olefin copolymers; and ethylene-butene-propylene terpolymers.
• polyethylenes such as low-density polyethylene, medium-density polyethylene, high-density polyethylene, and linear low-density polyethylene
• ethylene- ⁇ -olefin copolymers polypropylenes such as homopolypropylene, block copolymers of polypropylene (e.g., block copoly
• the polyolefin resin when it is a copolymer, it may be a block copolymer or a random copolymer. These polyolefin resins may be used alone or in combination of two or more kinds. Among these, polypropylene is particularly preferred because of its excellent heat fusion properties, CO2 permeability, and heat resistance.
• the base material 11 is preferably formed from a polyolefin film such as a polyethylene film or a polypropylene film, more preferably from a stretched polyolefin film such as a stretched polyethylene film or a stretched polypropylene film, and particularly preferably from a stretched polypropylene film.
• the substrate 11 preferably constitutes one surface of the inner bag film 1 (the surface opposite to the adhesive layer 12).
• the substrate 11 preferably contains polyolefin, and furthermore, the heat-sealable resin layer 35 of the exterior material 3 preferably contains polyolefin.
• the heat-sealable resin layer 35 and the substrate 11 can be suitably heat-sealed to each other.
• the heat-sealable resin layer 35 of the exterior material 3 and the substrate 11 of the inner bag film 1 are in contact with each other, the heat-sealable resin layer 35 of the exterior material 3 and the substrate 11 of the inner bag film 1 can be heat-sealed to each other, and the inner bag film 1 can be fixed in the exterior material 3.
• the substrate 11 has a CO2 permeability at a temperature of 23°C and a relative humidity of 0% RH for 24 hours of preferably about 6,000 cc/m2 or more , more preferably about 8,000 cc/ m2 or more, and even more preferably about 10,000 cc/m2 or more.
• the upper limit of the CO2 permeability is, for example, about 30,000 cc/ m2 or about 20,000 cc/ m2 .
• Preferred ranges of the CO2 permeability are about 6,000 to 30,000 cc/ m2 , about 6,000 to 20,000 cc/ m2 , about 8,000 to 30,000 cc/ m2 , about 8,000 to 20,000 cc/m2, and about 10,000 to 30,000 cc/m2. 2 and 10,000 to 20,000 cc/ m2 .
• polyester film, polyvinylidene chloride, etc. have a CO2 permeability of 2,000 cc/ m2 or less.
• the thickness of the substrate 11 is preferably 5 ⁇ m or more, more preferably 10 ⁇ m or more, even more preferably 15 ⁇ m or more, and is preferably 30 ⁇ m or less, more preferably 25 ⁇ m or less, even more preferably 20 ⁇ m or less, and preferred ranges include about 5 to 30 ⁇ m, about 5 to 25 ⁇ m, about 5 to 20 ⁇ m, about 10 to 30 ⁇ m, about 10 to 25 ⁇ m, about 10 to 20 ⁇ m, about 15 to 30 ⁇ m, about 15 to 25 ⁇ m, and about 15 to 20 ⁇ m.
• the inner bag film 1 includes an adhesive layer 12.
• the adhesive layer 12 constitutes one surface of the inner bag film 1, and is a layer disposed on the battery element 4 side.
• the adhesive layer 12 has adhesive properties. As described above, it is preferable that the adhesive layer 12 of the inner bag film 1 has heat-sealing properties. It is also preferable that the adhesive layers 12 have heat-sealing properties with each other. It is also preferable that the adhesive layer 12 of the inner bag film 1 has adhesive properties to metal, as described above.
• the resin contained in the adhesive layer 12 is not particularly limited, as long as it has adhesive properties.
• the resin contained in the adhesive layer 12 include resins such as polyolefin, polyamide, epoxy resin, acrylic resin, fluororesin, polyurethane, silicone resin, and phenolic resin, as well as thermoplastic resins such as modified versions of these resins.
• polypropylene, ethylene-methacrylic acid copolymer (EMAA), ethylene-methyl methacrylate copolymer (EMMA), and ethylene-methyl acrylate copolymer (EMA) are preferred.
• Specific examples of polyolefins include those exemplified for the substrate 11.
• the resin contained in the adhesive layer 12 may be of only one type, or of two or more types.
• the resin contained in the adhesive layer 12 preferably has excellent CO2 permeability.
• the adhesive layer 12 has a CO2 permeability at a temperature of 23°C and a relative humidity of 0% RH for 24 hours of preferably about 100,000 cc/ m2 or more, more preferably about 120,000 cc/ m2 or more, and even more preferably about 150,000 cc/m2 or more .
• the upper limit of the CO2 permeability is, for example, about 400,000 cc/ m2 , more preferably about 300,000 cc/ m2 .
• the preferred range of the CO2 permeability is about 100,000 to 400,000 cc/ m2 , about 100,000 to 300,000 cc/ m2 , about 120,000 to 400,000 cc/ m2 , or about 120,000 to 300,000 cc/m2. 2 , about 150,0000 to 400,000 cc/ m2 , and about 150,000 to 300,000 cc/ m2 .
• the thickness of the adhesive layer 12 is preferably 2 ⁇ m or more, more preferably 3 ⁇ m or more, and even more preferably 4 ⁇ m or more, and is preferably 20 ⁇ m or less, more preferably 10 ⁇ m or less, and even more preferably 8 ⁇ m or less, with preferred ranges including about 2 to 20 ⁇ m, about 2 to 10 ⁇ m, about 2 to 8 ⁇ m, about 3 to 20 ⁇ m, about 3 to 10 ⁇ m, about 3 to 8 ⁇ m, about 4 to 20 ⁇ m, about 4 to 10 ⁇ m, and about 4 to 8 ⁇ m.
• the manufacturing method of the inner bag film 1 is not particularly limited as long as an inner bag film for a semi-solid battery can be obtained, and known or conventional film-forming methods and lamination methods can be applied.
• the inner bag film 1 can be manufactured by known film-forming methods and/or lamination methods such as extrusion or co-extrusion, cast molding, T-die method, cutting method, inflation method, etc.
• the films constituting each layer prepared in advance may be laminated via an adhesive, a molten resin composition may be laminated on a layer prepared in advance by extrusion or co-extrusion, a plurality of layers may be simultaneously prepared and laminated by melt pressure bonding, or one or more resins may be applied and dried to coat another layer.
• each layer constituting the inner bag film 1 may be subjected to a desired surface treatment in advance, if necessary.
• a corona discharge treatment, ozone treatment, low-temperature plasma treatment using oxygen gas or nitrogen gas, glow discharge treatment, oxidation treatment using chemicals, etc. may be optionally performed as a pretreatment to form a corona treatment layer, an ozone treatment layer, a plasma treatment layer, an oxidation treatment layer, etc.
• various coating layers such as a primer coating layer, an undercoat layer, an anchor coating layer, an adhesive layer, and a vapor deposition anchor coating layer may be optionally formed on the surface to form a surface treatment layer.
• resin compositions containing isocyanate-based resins, polyester-based resins, polyamide-based resins, polyurethane-based resins, epoxy-based resins, phenol-based resins, (meth)acrylic resins, polyvinyl acetate-based resins, polyolefin-based resins such as polyethylene or polypropylene, or copolymers or modified resins thereof, cellulose-based resins, etc. as the main components of the vehicle may be used.
• Each layer constituting the inner bag film for semi-solid batteries can be further uniaxially or biaxially stretched by a conventionally known method using a tenter method, a tubular method, or the like, as necessary.
• a battery element 4 including at least a semi-solid positive electrode, a semi-solid negative electrode, and an electrolyte is housed in an inner bag formed by an inner bag film 1 for a semi-solid battery, and the inner bag is further housed in a package formed by an exterior material 3.
• the inner bag film 1 is composed of a laminate including at least a substrate 11 and an adhesive layer 12, and the substrate 11 contains polyolefin.
• the battery element 4 is covered by the inner bag film 1, which is further covered by the exterior material 3. More specifically, in the semi-solid battery 10 of the present disclosure, the battery element 4 is housed in an inner bag formed by the inner bag film 1, and further, a plurality of inner bags housing the battery element 4 are housed in a package formed by the exterior material 3. It is preferable that the battery element 4 has a structure in which it is sealed (hermetically sealed) by the inner bag film 1. It is also preferable that the battery element 4 and the inner bag film 1 have a structure in which they are sealed (hermetically sealed) by the exterior material 3. It is preferable that the battery element 4 has a structure in which it is doubly sealed by the inner bag film 1 and the exterior material 3.
• the battery element 4 can be covered with the inner bag film 1, and the flange portion of the inner bag film 1 can be heat sealed to seal the battery element 4 inside the inner bag. Furthermore, the inner bag with the battery element 4 sealed inside can be covered with the exterior material 3, and the flange portion of the inner bag film 1 can be heat sealed to seal the battery element inside the inner bag.
• the inner bag film 1 is used with the adhesive layer 12 facing inside (the surface in contact with the battery element 4).
• the semi-solid battery 10 may be such that multiple inner bags each containing a battery element 4 are housed in a package.
• at least some of the multiple inner bags each containing a battery element 4 can be fixed together by heat sealing.
• at least two inner bags can be fixed together by heat sealing the base materials 11 of the inner bag film 1 that constitutes the inner bag.
• the peripheral portion 30a of the inner bag is preferred.
• the battery element 4 is covered with the inner bag film 1 to form each cell 30. Furthermore, a plurality of cells 30 are covered with the exterior material 3.
• the inner bag (cell 30) containing the battery element 4 is covered with the exterior material 3 so that a flange portion (peripheral portion 3a of the exterior material 3) of the exterior material 3 is formed near the periphery of the inner bag (cell 30) containing the battery element 4, and the flange portion of the exterior material 3 is heat-sealed to form a package containing the inner bag (cell 30).
• the inner bag containing the battery element 4 can be the cell 30.
• the use of the inner bag film 1 of the present disclosure is not limited to the inner bag of the cell (single cell), and there is no particular limit to the use of the inner bag film 1 as long as it is placed between the exterior material 3 and the battery element 4 of the semi-solid battery 10.
• the semi-solid battery 10 shown in the schematic diagram of FIG. 3 two cells 30 are housed in a package formed by an exterior material 3, and in each cell 30, the battery element 4 is housed in an inner bag formed by an inner bag film 1.
• the number of cells in the package may be two or more, and for example, 2 to 20 cells are housed in the package.
• each inner bag is composed of two inner bag films 1.
• the adhesive layers 12 of the two inner bag films 1 are bonded together at the flange portion 30a, thereby sealing the battery element 4 inside the inner bag.
• the inner bag may be composed of one inner bag film, or two or more inner bag films.
• the cells 30 are fixed together by heat sealing the base material 11 of the inner bag film 1 that constitutes the outer surface of the inner bag at the flange portion of the inner bag (the peripheral portion 30a of the inner bag).
• the inner bag film 1 is used with the aforementioned adhesive layer 12 facing inward (the surface in contact with the battery element 4).
• the exterior material 3 is used with the heat-sealable resin layer 35, which will be described later, facing inward (the surface in contact with the inner bag film 1).
• FIG. 3 shows a schematic diagram of an electrode 40 connected from the battery element 4 to the metal terminal 2.
• An adhesive film 21 for the metal terminal can be disposed between the metal terminal 2 and the exterior material 3. By disposing the adhesive film 21 for the metal terminal, the adhesion between the metal terminal 2 and the heat-sealable resin layer 35 of the exterior material 3 can be improved.
• the inner bag film 1 (the adhesive layer 12) can be adhered to the electrode 40, and at the position where the electrode 40 is not present, the inner bag films 1 (the adhesive layers 12) can be adhered to each other.
• the adhesive layer 12 has adhesive properties to metal.
• the exterior material 3 (the heat-sealable resin layer 35) can be adhered to the metal terminal 2 via the adhesive film 21 for metal terminal, and at the position where the metal terminal 2 is not present, the exterior material 3 (the heat-sealable resin layer 35) can be adhered to each other.
• the end of the inner bag film 1 (at least a part of the peripheral portion 30a (flange portion) of the inner bag) may be located at the flange portion (peripheral portion 3a of the outer bag 3) of the outer bag 3.
• the inner bag may be arranged so that the end of the inner bag film 1 is present at least a part of the position where the heat-sealable resin layers 35 of the outer bag 3 are heat-sealed to each other, and/or at least a part of the position where the heat-sealable resin layer 35 of the outer bag 3 is adhered to the metal terminal 2.
• the inner bag By arranging in this way, it is possible to heat-seal the base material 11 of the inner bag film 1 and the heat-sealable resin layer 35 of the outer bag 3 to further firmly fix the inner bag.
• the upper surface, lower surface, etc. of the inner bag may be heat-sealed to the thermoplastic resin 35 of the outer bag 3. This allows the inner bag and the outer packaging material to be fixed together, and also eliminates the need to form a flange on the inner bag, which also contributes to the miniaturization (space saving) of the semi-solid battery 10.
• the semi-solid battery to which the inner bag film 1 of the present disclosure is applied is not particularly limited.
• the positive electrode and the negative electrode are electrochemically active semi-solids.
• the positive electrode and the negative electrode may have, for example, an active material and an electrolyte.
• the electrolyte may be, for example, a solvent or a solvent mixture to which a salt has been added.
• the positive electrode and the negative electrode may contain an additive.
• the positive and negative electrodes may include, for example, the active materials, compositions, and semi-solid suspensions described in U.S. Provisional Patent Application No. 61/787,382, entitled “Semi-Solid Electrodes Having High Rate Capability," and U.S. Provisional Patent Application No. 61/787,372, entitled "Asymmetric Battery Having a Semi-Solid Cathode and High Energy Density Anode.”
• the thickness of the positive electrode and negative electrode can each be, for example, about 250 to 2000 ⁇ m.
• a separator is located between the positive and negative electrodes and separates the positive and negative sides of the battery element.
• the separator reduces the possibility of short circuits within the battery element.
• the separator comprises an insulator.
• the separator may comprise, for example, a ductile and elastic polymer.
• the separator may comprise, for example, a polyolefin, polyvinyl chloride, nylon, fluorocarbon, or polystyrene.
• a metal can be used as the exterior material 3.
• an exterior material having a laminated structure consisting of at least a base material layer 31, a barrier layer 33, and a heat-sealable resin layer 35 in this order is also suitable.
• FIG. 2 shows an example of a cross-sectional structure of such an exterior material 3, in which a base material layer 31, an adhesive layer 32 provided as needed, a barrier layer 33, an adhesive layer 34 provided as needed, and a heat-sealable resin layer 35 are laminated in this order.
• the base material layer 31 is the outer layer side, and the heat-sealable resin layer 35 is the innermost layer.
• the heat-sealable resin layers 35 located on the periphery of the battery element 4 are brought into contact with each other and heat-sealed to seal the battery element 4, thereby sealing the battery element 4.
• 3 illustrates the semi-solid battery 10 using an embossed exterior material 3 formed by embossing or the like, but the exterior material 3 may be an unformed pouch type.
• the pouch type includes three-sided seal, four-sided seal, pillow type, and the like, and any type may be used.
• the thickness of the laminate constituting the exterior material 3 is not particularly limited, but from the viewpoint of cost reduction, energy density improvement, etc., examples of the thickness include about 210 ⁇ m or less, preferably about 190 ⁇ m or less, about 180 ⁇ m or less, about 155 ⁇ m or less, and about 120 ⁇ m or less.
• the thickness of the laminate constituting the semi-solid battery exterior material 3 is preferably about 35 ⁇ m or more, about 45 ⁇ m or more, and about 60 ⁇ m or more.
• preferred ranges for the laminate constituting the semi-solid battery exterior material 3 include, for example, about 35 to 210 ⁇ m, about 35 to 190 ⁇ m, about 35 to 180 ⁇ m, about 35 to 155 ⁇ m, about 35 to 120 ⁇ m, about 45 to 210 ⁇ m, about 45 to 190 ⁇ m, about 45 to 180 ⁇ m, about 45 to 155 ⁇ m, about 45 to 120 ⁇ m, about 60 to 210 ⁇ m, about 60 to 190 ⁇ m, about 60 to 180 ⁇ m, about 60 to 155 ⁇ m, and about 60 to 120 ⁇ m.
• about 60 to 155 ⁇ m is preferred, and when improving moldability, about 155 to 190 ⁇ m is preferred.
• the base material layer 31 is a layer that functions as a base material of the exterior packaging material, and is a layer that forms the outermost layer side.
• the material forming the base layer 31 is not particularly limited, as long as it has insulating properties.
• materials forming the base layer 31 include polyester, polyamide, epoxy, acrylic resin, fluororesin, polyurethane, silicone resin, phenol, polyetherimide, polyimide, and mixtures and copolymers thereof.
• Polyesters such as polyethylene terephthalate and polybutylene terephthalate have the advantage of being highly resistant to electrolyte and being less susceptible to whitening due to adhesion of electrolyte, and are therefore preferably used as materials for forming the base layer 31.
• polyamide film has excellent stretchability and can prevent whitening due to resin cracking of the base layer 31 during molding, and is therefore preferably used as materials for forming the base layer 31.
• the substrate layer 31 may be formed of a uniaxially or biaxially stretched resin film, or may be formed of an unstretched resin film. Among them, uniaxially or biaxially stretched resin films, especially biaxially stretched resin films, are preferably used as the substrate layer 31 because their heat resistance is improved by oriented crystallization.
• the resin film forming the base layer 31 is preferably nylon or polyester, and more preferably biaxially oriented nylon or biaxially oriented polyester.
• the base layer 31 can be made by laminating resin films of different materials in order to improve pinhole resistance and insulation when used as a package for a semi-solid battery.
• resin films of different materials include a multi-layer structure in which a polyester film is laminated with a nylon film, or a multi-layer structure in which biaxially oriented polyester is laminated with a biaxially oriented nylon.
• the resin films may be bonded via an adhesive, or may be directly laminated without an adhesive.
• bonding without an adhesive examples include a method of bonding in a hot melt state, such as co-extrusion, sand lamination, or thermal lamination.
• the base layer 31 may be made low-friction to improve formability.
• the base layer 31 low-friction there are no particular limitations on the coefficient of friction of its surface, but an example of this is 1.0 or less.
• Examples of ways to make the base layer 31 low-friction include matte treatment, forming a thin layer of a slip agent, and combinations of these.
• the thickness of the base layer 31 is, for example, about 10 to 50 ⁇ m, and preferably about 15 to 30 ⁇ m.
• the adhesive layer 32 is a layer that is disposed on the base material layer 31 as necessary in order to impart adhesion to the base material layer 31. That is, the adhesive layer 32 is provided between the base material layer 31 and the barrier layer 33.
• the adhesive layer 32 is formed from an adhesive capable of bonding the base layer 31 and the barrier layer 33.
• the adhesive used to form the adhesive layer 32 may be a two-component curing adhesive or a one-component curing adhesive.
• the resin components of the adhesive that can be used to form the adhesive layer 32 are preferably polyurethane-based two-component curing adhesives; polyamide, polyester, or blends of these with modified polyolefins, from the viewpoint of excellent ductility, durability under high humidity conditions, yellowing prevention, and thermal degradation prevention during heat sealing, and of effectively suppressing the decrease in laminate strength between the base layer 31 and the barrier layer 33 and preventing delamination.
• the adhesive layer 32 may be multi-layered with different adhesive components.
• the adhesive layer 32 is multi-layered with different adhesive components, it is preferable to select a resin with excellent adhesion to the base layer 31 as the adhesive component arranged on the base layer 31 side, and an adhesive component with excellent adhesion to the barrier layer 33 as the adhesive component arranged on the barrier layer 33 side, from the viewpoint of improving the laminate strength between the base layer 31 and the barrier layer 33.
• the adhesive component arranged on the barrier layer 33 side is preferably an acid-modified polyolefin, a metal-modified polyolefin, a mixed resin of polyester and acid-modified polyolefin, a resin containing a copolymerized polyester, etc.
• the thickness of the adhesive layer 32 is, for example, about 2 to 50 ⁇ m, and preferably about 3 to 25 ⁇ m.
• the barrier layer 33 is a layer that has the function of preventing water vapor, oxygen, light, and the like from penetrating into the inside of the semi-solid battery in addition to improving the strength of the exterior material.
• the barrier layer 33 is preferably a metal layer, that is, a layer formed of a metal. Specific examples of the metal constituting the barrier layer 33 include aluminum, stainless steel, and titanium, and aluminum is preferred.
• the barrier layer 33 can be formed, for example, of a metal foil, a metal vapor deposition film, an inorganic oxide vapor deposition film, a carbon-containing inorganic oxide vapor deposition film, or a film provided with these vapor deposition films, and is preferably formed of a metal foil, and more preferably formed of an aluminum foil.
• the barrier layer is more preferably formed from a soft aluminum foil such as annealed aluminum (JIS H4160:1994 A8021H-O, JIS H4160:1994 A8079H-O, JIS H4000:2014 A8021P-O, JIS H4000:2014 A8079P-O).
• a soft aluminum foil such as annealed aluminum
• the thickness of the barrier layer 33 is preferably about 10 to 200 ⁇ m, more preferably about 20 to 100 ⁇ m, about 20 to 45 ⁇ m, about 45 to 65 ⁇ m, or about 65 to 85 ⁇ m, from the viewpoint of making the exterior material thin while making it difficult for pinholes to occur during molding.
• barrier layer 33 it is preferable that at least one surface, and preferably both surfaces, of the barrier layer 33 are chemically treated to stabilize adhesion and prevent dissolution and corrosion.
• chemical treatment refers to a process for forming a corrosion-resistant film on the surface of the barrier layer.
• the adhesive layer 34 is a layer that is provided, if necessary, between the barrier layer 33 and the heat-sealable resin layer 35 in order to firmly bond the heat-sealable resin layer 35.
• the adhesive layer 34 is formed by an adhesive capable of bonding the barrier layer 33 and the heat-sealable resin layer 35.
• the composition of the adhesive used to form the adhesive layer is not particularly limited, but examples thereof include a resin composition containing an acid-modified polyolefin.
• the acid-modified polyolefin is a polymer modified by block polymerization or graft polymerization of a polyolefin with an acid component.
• the polyolefin to be acid-modified may be the above-mentioned polyolefin, a copolymer obtained by copolymerizing the above-mentioned polyolefin with a polar molecule such as acrylic acid or methacrylic acid, or a polymer such as a cross-linked polyolefin.
• the acid component used for the acid modification may be, for example, a carboxylic acid or anhydride such as maleic acid, acrylic acid, itaconic acid, crotonic acid, maleic anhydride, or itaconic anhydride.
• the acid-modified polyolefin may be an acid-modified cyclic polyolefin.
• the acid-modified cyclic polyolefin is a polymer obtained by copolymerizing a part of the monomers constituting the cyclic polyolefin with an acid component, or by block polymerization or graft polymerization of an acid component to the cyclic polyolefin.
• the acid-modified cyclic polyolefin is the same as described above.
• the acid component used for the acid modification is the same as the acid component used for the modification of the polyolefin described above.
• Preferred acid-modified polyolefins include polyolefins modified with carboxylic acids or their anhydrides, polypropylenes modified with carboxylic acids or their anhydrides, maleic anhydride-modified polyolefins, and maleic anhydride-modified polypropylenes.
• the thickness of the adhesive layer 34 is, for example, about 1 to 40 ⁇ m, and preferably about 2 to 30 ⁇ m.
• the heat-sealable resin layer 35 corresponds to the innermost layer, and is a layer that seals the battery element by heat-sealing the heat-sealable resin layers together when assembling the semi-solid battery.
• the resin components used in the heat-sealable resin layer 35 are not particularly limited, as long as they are heat-sealable, but examples include polyolefins and cyclic polyolefins. By forming the heat-sealable resin layer 35 from polyolefins, good adhesion is achieved when the inner bag film 1 and the exterior material 3 are heat-sealed.
• polystyrene resin examples include polyethylenes such as low-density polyethylene, medium-density polyethylene, high-density polyethylene, and linear low-density polyethylene; crystalline or amorphous polypropylenes such as homopolypropylene, block copolymers of polypropylene (e.g., block copolymers of propylene and ethylene), and random copolymers of polypropylene (e.g., random copolymers of propylene and ethylene); and ethylene-butene-propylene terpolymers.
• polyethylene and polypropylene are preferred.
• the cyclic polyolefin is a copolymer of an olefin and a cyclic monomer
• examples of the olefins constituting the cyclic polyolefin include ethylene, propylene, 4-methyl-1-pentene, butadiene, and isoprene.
• examples of the cyclic monomers constituting the cyclic polyolefin include cyclic alkenes such as norbornene; specifically, cyclic dienes such as cyclopentadiene, dicyclopentadiene, cyclohexadiene, and norbornadiene.
• cyclic alkenes are preferred, and norbornene is more preferred.
• Styrene is also an example of a constituting monomer.
• crystalline or amorphous polyolefins preferred are crystalline or amorphous polyolefins, cyclic polyolefins, and blended polymers thereof; more preferred are polyethylene, polypropylene, copolymers of ethylene and norbornene, and blended polymers of two or more of these.
• the heat-sealable resin layer 35 may be formed from one type of resin component alone, or may be formed from a blend polymer of two or more types of resin components. Furthermore, the heat-sealable resin layer 35 may be formed from only one layer, or may be formed from two or more layers of the same or different resin components. It is particularly preferable that the adhesive layer 12 of the inner bag film 1 and the heat-sealable resin layer 35 are made of the same resin, as this improves the adhesion between these layers.
• the thickness of the heat-sealable resin layer 35 is not particularly limited, but may be about 2 to 2000 ⁇ m, preferably about 5 to 1000 ⁇ m, and more preferably about 10 to 500 ⁇ m.
• the thickness of the heat-sealable resin layer 35 may be, for example, about 100 ⁇ m or less, preferably about 85 ⁇ m or less, and more preferably about 15 to 85 ⁇ m.
• the thickness of the adhesive layer 34 is 10 ⁇ m or more
• the thickness of the heat-sealable resin layer 35 is preferably about 85 ⁇ m or less, and more preferably about 15 to 45 ⁇ m.
• the thickness of the adhesive layer 34 is less than 10 ⁇ m or when the adhesive layer 34 is not provided, the thickness of the heat-sealable resin layer 35 is preferably about 20 ⁇ m or more, and more preferably about 35 to 85 ⁇ m.
• Example 1 A two-layered inner bag film for semi-solid batteries (total thickness 20 ⁇ m) was manufactured by extruding polypropylene (PP) or ethylene-methacrylic acid copolymer (EMAA) as an adhesive layer (thickness 4 ⁇ m) on one side of an oriented polypropylene film (OPP) as a substrate (thickness 16 ⁇ m) so as to obtain the laminated structure shown in Table 1.
• the CO 2 permeability of the substrate shown in Table 1 is the CO 2 permeability at a temperature of 25° C. and a relative humidity of 65% RH for 24 hours, and is the value described in “For Functional Food Packaging Materials, Kosuke Ishikawa, CMC Publishing Co., Ltd., Publication Date: April 2005, p. 73”.
• Example 1 A two-layered inner bag film for semi-solid batteries (total thickness 20 ⁇ m) was produced by extruding ethylene-methacrylic acid copolymer (EMAA) as an adhesive layer (thickness 8 ⁇ m) on a polyethylene terephthalate film as a substrate (thickness 12 ⁇ m) so as to obtain the laminated structure shown in Table 1.
• the CO2 permeability of the substrate shown in Table 1 is the CO2 permeability at a temperature of 25°C and a relative humidity of 65% RH for 24 hours, and is the value described in "For Functional Food Packaging Materials, Kosuke Ishikawa, CMC Publishing Co., Ltd., Publication Date: April 2005, p. 73".
• the heat fusion property between the substrates of the inner bag film for semi-solid batteries was evaluated by the following method. The results are shown in Table 1.
• the substrates of the inner bag film for semi-solid batteries were heat fused together, and the peel strength in a 25°C environment was measured as follows. A sample was cut out from the inner bag film for semi-solid batteries into a strip shape with a length of 80 mm in the MD direction and a width of 15 mm in the TD direction. The sample was folded in the MD direction with the substrate surface facing inward, and heated and pressed with a heat sealer (width of heat seal bar: 7 mm) to prepare a measurement sample (length in the MD direction: 40 mm).
• the measurement sample was attached to a tensile tester, and the peel strength between the substrates was measured under conditions of a tensile speed of 50 mm/min and a gauge length of 50 mm, and the maximum strength (N/15 mm) at the time of peeling was adopted.
• the average value of three measurements was used.
• the heat seal conditions were fixed at a temperature of 170°C, a surface pressure of 0.4 MPa, and a press time of 0.3 seconds, and the measurement was performed.
• the sealability evaluation criteria are as follows. A+: The peel strength between the substrates exceeded 1.0 N/15 mm.
• A The peel strength between the substrates was 0.1 N/15 mm or more and 1.0 N/15 mm or less.
• C The peel strength between the substrates was less than 0.1 N/15 mm, or the substrates were not thermally fused to each other.
• the moldability of the inner bag film for a semi-solid battery was evaluated by the following method. The results are shown in Table 1.
• the inner bag film for a semi-solid battery was cut into a rectangle with a length (MD direction) of 90 mm and a width (TD direction) of 150 mm to prepare a test sample.
• the maximum height roughness (nominal value of Rz) specified in Table 2 of the comparative surface roughness standard piece is 3.2 ⁇ m.
• the molding depth was changed in 0.5 mm increments from a molding depth of 0.5 mm at a pressing pressure (surface pressure) of 0.25 MPa, and cold molding (one-stage drawing molding) was performed on 10 samples each.
• the above test sample was placed on a female mold so that the heat-sealable resin layer side was located on the male mold side, and molding was performed.
• the clearance between the male mold and the female mold was 0.3 mm.
• the sample after cold molding was irradiated with light from a penlight in a dark room to confirm whether pinholes or cracks were generated in the inner bag film for semi-solid batteries due to light transmission.
• the deepest molding depth at which no pinholes or cracks occurred in the inner bag film for a semi-solid battery in any of the 10 samples was defined as A mm
• the number of samples at which pinholes or the like occurred in the inner bag film for a semi-solid battery at the shallowest molding depth was defined as B.
• the value calculated by the following formula was rounded off to two decimal places to determine the limit molding depth of the inner bag film for a semi-solid battery.
• Limit forming depth A mm + (0.5 mm/10 pieces) x (10 pieces - B pieces)
• the heat resistance of the inner bag film for semi-solid batteries was evaluated by the following method. The results are shown in Table 1.
• the peel strength in an 80°C environment was measured as follows. A sample was cut out from the inner bag film for semi-solid batteries in a strip shape with a width of 15 mm in the TD direction, folded with the adhesive layer surface on the inside, and bonded with a heat sealer (heat seal bar width of 7 mm) to prepare a measurement sample.
• peel strength the adhesive layer-adhesive layer adhesive strength
• N/15 mm the maximum strength at the time of peeling
• the average value of three measurements was used.
• the heat seal conditions were fixed at a temperature of 150°C, a surface pressure of 0.4 MPa, and a press time of 0.3 seconds, and the measurement was performed.
• the heat resistance evaluation criteria are as follows. A: Peel strength is 1.0 (N/15 mm) or more. B: Peel strength is less than 1.0 (N/15 mm).
• An inner bag film for a semi-solid battery which is disposed between an exterior material of the semi-solid battery and a battery element,
• the inner bag film for a semi-solid battery is composed of a laminate including at least a substrate and an adhesive layer,
• the inner bag film for a semi-solid battery, wherein the substrate comprises a polyolefin.
• the inner bag film for a semi-solid battery according to Item 1 wherein the substrate is made of a stretched polypropylene film.
• Item 5. The inner bag film for a semi-solid battery according to any one of Items 1 to 4, wherein the adhesive layer has a thickness of 2 ⁇ m or more and 20 ⁇ m or less.
• Item 6. The inner bag film for a semisolid battery according to any one of Items 1 to 5, wherein the inner bag film for a semisolid battery does not have a metal layer formed of a metal.
• Item 7 The inner bag film for a semi-solid battery according to any one of Items 1 to 6, wherein the substrate has a CO 2 permeability of 6000 cc/m 2 or more at a temperature of 23° C.
• Item 8 The inner bag film for a semi-solid battery according to any one of Items 1 to 7, wherein the exterior material is composed of a laminate in which at least a base material layer, a barrier layer, and a heat-sealable resin layer are laminated in this order.
• Item 9 The inner bag film for a semisolid battery according to any one of Items 1 to 8, wherein the inner bag film has no holes for allowing gas to pass therethrough.
• a semi-solid battery in which a battery element including at least a semi-solid positive electrode, a semi-solid negative electrode, and an electrolyte is housed in an inner bag formed of an inner bag film for a semi-solid battery, and the inner bag is housed in a package formed of an exterior material
• the inner bag film for a semi-solid battery is composed of a laminate including at least a substrate and an adhesive layer,
• the substrate comprises a polyolefin.

Landscapes

• Sealing Battery Cases Or Jackets (AREA)
• Battery Mounting, Suspending (AREA)
• Laminated Bodies (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=93059198

Family Applications (1)

Country Status (2)

Citations (2)

Family Cites Families (5)

• 2024
  • 2024-04-04 JP JP2024559698A patent/JP7635900B1/ja active Active
  • 2024-04-04 WO PCT/JP2024/013991 patent/WO2024214636A1/ja not_active Ceased
  • 2024-12-24 JP JP2024227015A patent/JP2025041814A/ja active Pending

Patent Citations (2)

Also Published As

Similar Documents

Legal Events