WO2018110702A1 - 金属端子用接着性フィルム及び電池 - Google Patents
金属端子用接着性フィルム及び電池 Download PDFInfo
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- WO2018110702A1 WO2018110702A1 PCT/JP2017/045160 JP2017045160W WO2018110702A1 WO 2018110702 A1 WO2018110702 A1 WO 2018110702A1 JP 2017045160 W JP2017045160 W JP 2017045160W WO 2018110702 A1 WO2018110702 A1 WO 2018110702A1
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- Prior art keywords
- adhesive film
- layer
- polypropylene layer
- metal
- metal terminals
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- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/105—Pouches or flexible bags
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- H—ELECTRICITY
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- B32B15/09—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyesters
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- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
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- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
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- H—ELECTRICITY
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- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/78—Cases; Housings; Encapsulations; Mountings
- H01G11/80—Gaskets; Sealings
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
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- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
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- H—ELECTRICITY
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/172—Arrangements of electric connectors penetrating the casing
- H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
- H01M50/178—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for pouch or flexible bag cells
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/552—Terminals characterised by their shape
- H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
- H01M50/557—Plate-shaped terminals
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B2457/00—Electrical equipment
- B32B2457/10—Batteries
-
- 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
- the present invention relates to an adhesive film for metal terminals and a battery.
- packaging materials are indispensable members for sealing battery elements such as electrodes and electrolytes in all batteries.
- metal packaging materials have been widely used as battery packaging, but in recent years, with the increasing performance of electric vehicles, hybrid electric vehicles, personal computers, cameras, mobile phones, etc., batteries are required to have various shapes. At the same time, there is a demand for reduction in thickness and weight.
- conventionally used metal packaging materials have the disadvantages that it is difficult to follow the diversification of shapes and that there is a limit to weight reduction.
- the metal terminal protrudes from the heat seal portion of the packaging material, and the battery element sealed by the packaging material is electrically connected to the outside by the metal terminal electrically connected to the electrode of the battery element. That is, of the portion where the packaging material is heat-sealed, the portion where the metal terminal is present is heat-sealed in a state where the metal terminal is sandwiched between the heat-fusible resin layers. Since the metal terminal and the heat-fusible resin layer are made of different materials from each other, the adhesiveness tends to decrease at the interface between the metal terminal and the heat-fusible resin layer.
- an adhesive film may be disposed between the metal terminal and the heat-fusible resin layer for the purpose of improving the adhesion between them.
- Such an adhesive film is required to have excellent resistance to the electrolyte solution sealed with the packaging material in addition to the high adhesion to the packaging material and the metal terminal.
- the main object of the present invention is to provide an adhesive film for a metal terminal that has high adhesion to the packaging material and the metal terminal, and also has excellent resistance to electrolyte.
- Another object of the present invention is to provide a battery using the metal terminal adhesive film.
- an adhesive film for metal terminals interposed between a metal terminal electrically connected to the electrode of the battery element and a packaging material for sealing the battery element the adhesive film for metal terminal Is composed of a laminate comprising at least one polypropylene layer and at least one acid-modified polypropylene layer, and the acid-modified polypropylene layer is a surface layer on at least one side of the adhesive film for metal terminals.
- the polypropylene layer has a sea-island structure when the cross section is observed with an electron micrograph, and when the total thickness of the acid-modified polypropylene layer is 1, the total thickness of the polypropylene layer is 0.
- the adhesive film for metal terminals in the range of 0.7 to 3.5 has high adhesion to the packaging material and the metal terminals, and also has excellent resistance to electrolyte. It was. The present invention has been completed by further studies based on such knowledge.
- An adhesive film for metal terminals interposed between a metal terminal electrically connected to the electrode of the battery element and a packaging material for sealing the battery element,
- the adhesive film for metal terminals is composed of a laminate comprising at least one polypropylene layer and at least one acid-modified polypropylene layer,
- the acid-modified polypropylene layer constitutes a surface layer on at least one side of the adhesive film for metal terminals,
- the polypropylene layer has a sea-island structure observed when the cross section is observed with an electron micrograph,
- the adhesive film for metal terminals wherein the total thickness of the polypropylene layer is in the range of 0.7 to 3.5, where the total thickness of the acid-modified polypropylene layer is 1.
- Item 2. The metal terminal adhesive film according to Item 1, wherein the polypropylene layer contains block polypropylene.
- Item 3. Item 3. The metal terminal adhesive film according to Item 1 or 2, wherein the polypropylene layer is composed of unstretched polypropylene.
- Item 4. The item (1) to (3), wherein the polypropylene layer has a laminated structure in which a layer made of random polypropylene, a layer made of block polypropylene, and a layer made of random polypropylene are laminated in this order.
- Item 5. Item 5.
- Item 6 The adhesive film for metal terminals according to any one of Items 1 to 5, wherein the residual thickness ratio of the adhesive film for metal terminals is 50% or more as measured by the following measurement method.
- An aluminum plate having a thickness of 100 ⁇ m and the adhesive film for metal terminals are prepared.
- the thickness A ( ⁇ m) of the adhesive film for metal terminals is measured.
- the adhesive film for metal terminals is overlapped on a central portion of the aluminum plate so that the length direction and the width direction of the aluminum plate and the adhesive film for metal terminals coincide with each other.
- Two metal plates with a width of 7 mm longer than the length of the aluminum plate are prepared, and the temperature is measured from above and below the aluminum plate and the metal terminal adhesive film so as to cover the entire surface of the metal terminal adhesive film.
- the metal plate is heated and pressurized under the conditions of 190 ° C., surface pressure of 1.27 MPa, and time of 3 seconds to obtain a laminate of the aluminum plate and the metal terminal adhesive film.
- the thickness B ( ⁇ m) of the portion where the laminate is heated and pressed is measured.
- the packaging material is composed of a laminate including at least a base material layer, a barrier layer, and a heat-fusible resin layer in this order, Item 8.
- a battery element including at least a positive electrode, a negative electrode, and an electrolyte, a packaging material that seals the battery element, and a metal terminal that is electrically connected to each of the positive electrode and the negative electrode and protrudes outside the packaging material
- a battery comprising: Item 9.
- a laminate comprising at least one polypropylene layer and at least one acid-modified polypropylene layer
- the acid-modified polypropylene layer constitutes a surface layer on at least one side of the adhesive film for metal terminals
- the polypropylene layer has a sea-island structure observed when the cross section is observed with an electron micrograph, When the total thickness of the acid-modified polypropylene layer is 1, the total thickness of the polypropylene layer is in the range of 0.7 to 3.5,
- Use of the laminate as an adhesive film for a metal terminal interposed between a metal terminal electrically connected to an electrode of a battery element and a packaging material for sealing the battery element.
- an adhesive film for a metal terminal that has high adhesion to a packaging material and a metal terminal, and is also excellent in resistance to an electrolytic solution. Furthermore, according to this invention, the battery using the said adhesive film for metal terminals can also be provided.
- FIG. 2 is a schematic cross-sectional view taken along line A-A ′ of FIG. 1.
- FIG. 2 is a schematic cross-sectional view taken along line B-B ′ of FIG. 1.
- It is a schematic sectional drawing of the adhesive film for metal terminals of this invention.
- It is a schematic sectional drawing of the adhesive film for metal terminals of this invention.
- It is a schematic sectional drawing of the packaging material used for the battery of this invention.
- It is a schematic diagram for demonstrating the measuring method of the seal strength in an Example.
- It is a schematic diagram for demonstrating the measuring method of the seal strength in an Example.
- It is a schematic diagram for demonstrating the measuring method of the seal strength in an Example.
- the adhesive film for metal terminals of the present invention is an adhesive film for metal terminals interposed between a metal terminal electrically connected to an electrode of a battery element and a packaging material for sealing the battery element.
- the metal terminal adhesive film is composed of a laminate including at least one polypropylene layer and at least one acid-modified polypropylene layer, and the acid-modified polypropylene layer has the metal terminal adhesive property.
- a surface layer on at least one side of the film is formed, and the polypropylene layer has a sea-island structure when the cross-section is observed with an electron micrograph, and the total thickness of the acid-modified polypropylene layer is 1.
- the total thickness of the layers is in the range of 0.7 to 3.5.
- the numerical range indicated by “to” means “above” or “below”.
- the notation of 2 to 15 mm means 2 mm or more and 15 mm or less.
- the metal terminal adhesive film of the present invention is interposed between a metal terminal electrically connected to an electrode of a battery element and a packaging material for sealing the battery element. .
- the adhesive film 1 for metal terminals of the present invention includes a metal terminal 2 electrically connected to an electrode of the battery element 4 and a battery element 4. It is interposed between the packaging material 3 to be sealed.
- the metal terminal 2 protrudes outside the packaging material 3, and is sandwiched between the packaging material 3 via the metal terminal adhesive film 1 at the peripheral edge 3 a of the heat-sealed packaging material 3.
- the heat when heat-sealing the packaging material is usually in the range of about 160 to 220 ° C.
- the pressure is usually in the range of about 0.5 to 2.0 MPa.
- the adhesive film 1 for metal terminals of the present invention is provided in order to improve the adhesion between the metal terminals 2 and the packaging material 3.
- the sealing performance of the battery element 4 is improved.
- the battery element 4 is heat sealed, the battery element is sealed such that the metal terminal 2 electrically connected to the electrode of the battery element 4 protrudes outside the packaging material 3. .
- the metal terminal 2 formed of metal and the heat-fusible resin layer 34 (layer formed of a heat-fusible resin such as polyolefin) located in the innermost layer of the packaging material 3 are formed of different materials.
- the sealing performance of the battery element tends to be low at the interface between the metal terminal 2 and the heat-fusible resin layer 34. Even when an adhesive film is used, if the adhesive film has low electrolytic solution resistance, the sealing performance of the battery element tends to be low.
- the metal terminal adhesive film 1 of the present invention is composed of a laminate including at least one polypropylene layer 11 and at least one acid-modified polypropylene layer 12.
- the acid-modified polypropylene layer 12 constitutes a surface layer on at least one side of the metal terminal adhesive film 1, and the polypropylene layer 11 has a sea-island structure when the cross section is observed with an electron micrograph.
- the total thickness of the acid-modified polypropylene layer 12 is 1, the total thickness of the polypropylene layer 11 is set in the range of 0.7 to 3.5.
- the acid-modified polypropylene layer 12 constitutes a surface layer on at least one side of the metal terminal adhesive film.
- the acid-modified polypropylene layer 12 made of acid-modified polypropylene has excellent adhesion to a metal material as compared with the polypropylene layer 11 made of polypropylene. For this reason, by disposing the adhesive film 1 for metal terminals of the present invention between the metal terminal 2 and the packaging material 3 so that the acid-modified polypropylene layer 12 is positioned on the metal terminal 2 side, The sealing performance can be effectively increased.
- the metal terminal adhesive film 1 of the present invention only needs to have at least one polypropylene layer 11 and at least one acid-modified polypropylene layer 12 respectively.
- a structure in which a polypropylene layer 11 and an acid-modified polypropylene layer 12 are laminated one by one for example, in FIG.
- a structure in which acid-modified polypropylene layers 12 are laminated one on each side of the polypropylene layer 11 is exemplified.
- a single polypropylene layer 11 may be formed by continuously laminating a plurality of layers made of the same or different polypropylene, and the plurality of layers may constitute a single polypropylene layer 11. Good.
- a plurality of layers made of the same or different acid-modified polypropylene are continuously laminated, and the plurality of layers constitute one acid-modified polypropylene layer 12. It may be.
- a preferable laminated structure of the metal terminal adhesive film 1 of the present invention include a two-layer structure of acid-modified polypropylene layer 12 / polypropylene layer 11; acid-modified polypropylene layer 12 / polypropylene layer 11 / acid-modified polypropylene layer 12. A three-layer structure laminated in this order; a five-layer structure in which acid-modified polypropylene layer 12 / polypropylene layer 11 / acid-modified polypropylene layer 12 / polypropylene layer 11 / acid-modified polypropylene layer 12 are laminated in this order, etc.
- a two-layer structure of acid-modified polypropylene layer 12 / polypropylene layer 11; a three-layer structure in which acid-modified polypropylene layer 12 / polypropylene layer 11 / acid-modified polypropylene layer 12 are laminated in this order is more preferable.
- the adhesive film 1 for metal terminals of the present invention it is preferable that all layers are made of polyolefin. More specifically, the adhesive film 1 for a metal terminal of the present invention is also preferably configured by only the acid-modified polypropylene layer 12 and the polypropylene layer 11, and further includes another polyolefin layer composed of polyolefin. The embodiment is also preferable. Specific examples of the polyolefin constituting the polyolefin layer include polyethylene and acid-modified polyethylene. In the acid-modified polyethylene, the acid-modifying component of ethylene is not particularly limited, and examples thereof include unsaturated carboxylic acids used in acid modification exemplified in the acid-modified polypropylene layer 12 described later or anhydrides thereof.
- the adhesive film 1 for metal terminals of this invention is 40.
- it is 40.
- a melting peak is observed in the range of 150 to 165 ° C.
- the metal terminal adhesive film 1 having a residual rate of 50% or more By using the metal terminal adhesive film 1 having a residual rate of 50% or more, a short circuit between the barrier layer and the metal terminal contained in the packaging material can be effectively suppressed, and the packaging material and the metal It becomes possible to further improve the adhesiveness with the adhesive film for terminals. Moreover, by using the adhesive film 1 for a metal terminal having a residual rate of 90% or less, the shape of the step of the metal terminal can be suitably followed, and the end of the metal terminal can be suitably covered. Can do.
- An aluminum plate having a thickness of 100 ⁇ m (pure aluminum, JIS H4160-1994 A1N30H-O) and an adhesive film for metal terminals are prepared.
- the thickness A ( ⁇ m) of the adhesive film for metal terminals is measured with a micro gauge.
- the adhesive film for metal terminals is stacked on the center portion of the aluminum plate so that the length direction and the width direction of the aluminum plate and the adhesive film for metal terminals coincide with each other. At this time, it arrange
- the thickness B ( ⁇ m) of the heated and pressurized portion of the laminate is measured with a micro gauge.
- the length direction is a longitudinal direction corresponding to the long side of the object in plan view
- the width direction is a short direction corresponding to the short side of the object in plan view. When the size in the length direction and the width direction match (square), either may be used as the length direction or the width direction.
- the pressurization load (N) by a metal plate can be adjusted with the diameter and air pressure of the cylinder which adjust the pressure of a metal plate.
- the length of the adhesive film for metal terminals and the length of the aluminum plate can be determined by measuring at a temperature of 190 ° C., a surface pressure of 1.27 MPa, and a time of 3 seconds.
- the width and the width are not limited.
- this size of the metal terminal adhesiveness is used.
- the film and an aluminum plate having a length of 60 mm and a width of 25 mm the thickness residual ratio of the adhesive film for metal terminals can be suitably measured.
- Area to pressurize the metal terminal adhesive film (mm 2 )] is an area of the portion where the aluminum plate and the metal terminal adhesive film overlap, for example, the metal terminal adhesive for these sizes.
- the area is 60 mm ⁇ 5 mm.
- the thickness of the said aluminum plate does not change substantially by the heating and pressurization at the time of obtaining the laminated body of an aluminum plate and the adhesive film for metal terminals. Even if the size of the metal terminal adhesive film to be measured is different, the size of the aluminum plate may not be changed as long as the above measurement can be performed.
- the melt mass flow rate (MFR) of the entire adhesive film for metal terminal 1 of the present invention is not particularly limited, but the viewpoint of further improving the electrolytic solution resistance while further improving the adhesion between the packaging material and the metal terminal. Is preferably about 1 to 15, more preferably about 2 to 12, and still more preferably about 3 to 10.
- the melt mass flow rate (MFR) of the metal terminal adhesive film 1 as a whole is a value measured using a melt indexer by applying a measurement temperature of 230 ° C. and a load of 2.16 kg according to a method in accordance with JIS K7210: 2014. It is.
- a heat shrinkage rate (%) of the flow direction (MD) of the adhesive film 1 for metal terminals of this invention a minimum becomes like this.
- it is about 70% or more, More preferably, it is about 75% or more, More preferably, about The upper limit is preferably about 95% or less, more preferably about 92% or less, and still more preferably about 90% or less.
- the range of the heat shrinkage rate (%) is preferably about 70 to 95%, about 70 to 92%, about 70 to 90%, about 75 to 95%, about 75 to 92%, or about 75 to 90%. %, 80 to 95%, 80 to 92%, and 80 to 90%.
- the measurement method of the thermal shrinkage rate (%) is as follows.
- the metal terminal adhesive film is cut into a size of 50 mm in length (MD) ⁇ 4 mm in width (TD) to obtain a test piece.
- the length M (mm) of the test piece is measured with a metal scale.
- the end in the length direction of the test piece is fixed to the wire mesh with tape, and the test piece is suspended from the wire mesh. In this state, after placing it in an oven heated to 190 ° C. for 120 seconds, the test piece is taken out together with the wire mesh and naturally cooled in a room temperature (25 ° C.) environment.
- the length N (mm) of the test piece naturally cooled to room temperature is measured with a metal ruler.
- the metal terminal adhesive film When sealing the battery element, when the metal terminal adhesive film is heat-sealed while being sandwiched between the metal terminal and the packaging material, the pressure from the metal plate used for heat sealing In addition, there are a portion where the dimension of the adhesive film for metal terminal does not change, and a portion where the pressure is not applied because the distance from the metal plate is large, and the portion contracts. At this time, even in a portion where no pressure is applied, the thickness of the portion where the pressure is applied can be effectively suppressed by being appropriately thermally contracted toward the portion where the pressure is applied. On the other hand, when the thermal shrinkage of the metal terminal adhesive film is too large, the metal terminal adhesive film 1 is placed on the metal terminal and bonded to the metal terminal in a preheating stage before being subjected to heat sealing.
- the adhesive film 1 for metal terminals of the present invention has an appropriate heat shrinkage rate.
- the lower limit of the thermal contraction rate (%) of the above-mentioned flow direction (MD) is 70% or more, for example. It is done.
- the polypropylene layer 11 is a layer made of polypropylene.
- the polypropylene layer 11 has a sea-island structure when the cross section is observed with an electron micrograph.
- the observation of the sea-island structure in the cross-section of the polypropylene layer 11 means that the sea part and the island part are observed as in, for example, an electron micrograph shown in FIG. Fig. 11 shows “Polymer microphotographs: Macromolecules as seen in the eye 1.
- the ratio of the area of the island part is not particularly limited, but from the viewpoint of further improving the electrolytic solution resistance while further improving the adhesion with the packaging material and the metal terminal, Preferably about 10 to 50%, more preferably about 20 to 40%.
- the measuring method of the ratio of the area of the island part in the sea island structure of the polypropylene layer 11 is as follows. In addition, when the ratio of the area of an island part is 2% or less, it is evaluated that it does not have a sea island structure substantially.
- An adhesive film for metal terminals is embedded in a thermosetting epoxy resin and cured.
- a commercially available rotary microtome (UC6 manufactured by LEICA) and a cross section in the target direction (cross section along TD) were prepared using a diamond knife, and at that time, a cryomicrotome using liquid nitrogen was ⁇ 70 Cross section is prepared at ° C.
- the embedding resin is stained overnight with ruthenium tetroxide. Since the polypropylene expands when dyed, the expanded portion is trimmed with a microtome, and a portion further cut by about 1 to 2 ⁇ m with a thickness of about 100 nm is observed as follows.
- the stained cross section is observed with a field emission scanning electron microscope (for example, S-4800 TYPE1, manufactured by Hitachi High-Technologies Corporation, measurement condition: 3 kV 20 mA High WD 6 mm detector (Upper)), and an image (magnification is 10,000 times) is observed. get.
- image processing software that can binarize the image for example, image analysis software WinROOF (Ver 7.4) manufactured by Mitani Corporation) is used to binarize the island portion and the ocean portion of the sea-island structure for the image.
- the ratio of the area occupied by the island portion (the total area of the island portion / the area of the measurement range of the image) is obtained, for example, the conditions described in the embodiment are adopted as specific image processing conditions.
- the cold resistance strength is enhanced while maintaining the excellent heat resistance of the adhesive film for metal terminals. Moreover, adhesiveness with a packaging material and a metal terminal is improved, and also electrolyte solution resistance improves.
- the polypropylene layer 11 is preferably made of unstretched polypropylene. It can be confirmed that the polypropylene layer 11 is composed of unstretched polypropylene and is not composed of stretched polypropylene by analyzing the polypropylene layer 11 by the X-ray diffraction method. Specifically, when the wide-angle X-ray diffraction of the polypropylene layer 11 made of unstretched polypropylene is measured, it corresponds to the 110 plane of the polypropylene crystal with respect to the peak intensity corresponding to the 040 plane calculated from the diffraction pattern of the polypropylene crystal.
- the ratio of peak intensities (040-plane peak intensity / 110-plane peak intensity) is in the range of 0.5 to 1.5, and the polypropylene layer composed of stretched polypropylene is outside this range. That is, in the present invention, when the wide-angle X-ray diffraction is measured, the polypropylene layer 11 has a ratio of the peak intensity corresponding to the 110 plane of the polypropylene crystal to the peak intensity corresponding to the 040 plane calculated from the diffraction pattern of the polypropylene crystal ( (Peak intensity of 040 plane / peak intensity of 110 plane) is made of polypropylene having a range of 0.5 to 1.5.
- the measurement conditions by wide-angle X-ray diffraction are: Soller / PCS (opening angle of incident parallel slit): 5.0 deg, IS length (length of length limiting slit): 10.0 mm, PSA open (opening angle of light receiving PSA is open) ), Soller (opening angle of the light receiving parallel slit): 5.0 deg, 2 ⁇ / ⁇ : 2 to 40 deg, and the step is 0.04 deg.
- the polypropylene layer 11 is comprised with the unstretched polypropylene and is not comprised with the stretched polypropylene by analyzing the polypropylene layer 11 by a Raman spectroscopy. Specifically, when analyzed polypropylene layer by Raman spectroscopy, approximately the height of crystalline peak intensity appearing 809cm -1 "A", the amorphous peak intensity appearing at about 842cm -1 high When the ratio (A / B) of the length “B” is 1.6 or less, it can be confirmed that the polypropylene layer 11 is composed of unstretched polypropylene.
- the measurement conditions were a laser wavelength of 633 nm, a grating of 600 gr / mm, a confocal hole of 100 ⁇ m, a microscope lens of 10 times, an exposure time of 15 sec, an integration count of 1 time, and a cross section parallel to the MD (Machine Direction) of the polypropylene layer 11.
- the Raman spectrum was measured so that the MD and the incident laser polarization plane were parallel.
- a straight line connecting 710 cm ⁇ 1 and 925 cm ⁇ 1 was used as a baseline. Analysis conditions, the time of the baseline correction, the peak height at 809cm -1 and 842cm -1, was calculated as the peak intensity.
- the above-described “A” peak intensity of crystallinity appearing at about 809 cm ⁇ 1 is a peak attributed to a combination mode of main chain CC expansion and contraction and CH3 bending vibration. Further, the height “B” of the amorphous peak intensity appearing at about 842 cm ⁇ 1 is a peak attributed to the CH3 bending vibration mode.
- the method for confirming the MD of the polypropylene layer 11 is as follows. About each cross section (total of 10 cross sections) up to the direction perpendicular to the cross section in the length direction by changing the angle by 10 degrees from the cross section in the length direction of the polypropylene layer 11 and the direction parallel to the cross section in the length direction. In each case, the sea-island structure is confirmed by observation with an electron micrograph. Next, the shape of each island is observed in each cross section. With respect to the shape of each island, a straight line distance connecting the leftmost end in the direction perpendicular to the thickness direction of the polypropylene layer 11 and the rightmost end in the vertical direction is defined as a diameter y. In each cross section, the average of the top 20 diameters y is calculated in descending order of the diameter y of the island shape. The direction parallel to the cross section where the average of the diameter y of the island shape is the largest is determined as MD.
- the polypropylene contained in the polypropylene layer 11 is preferably crystalline such as homopolypropylene, block copolymer of polypropylene (for example, block copolymer of propylene and ethylene), random copolymer of polypropylene (for example, random copolymer of propylene and ethylene) or the like.
- Amorphous polypropylene is mentioned.
- compositions in which the polypropylene layer 11 has the above-described sea-island structure include, for example, a composition in which the polypropylene layer 11 contains a polypropylene block copolymer, a composition containing a polypropylene block copolymer and a polypropylene random copolymer, and homopolypropylene and random polypropylene.
- examples include a composition containing a polyethylene component.
- the proportion of propylene contained in the block polypropylene is preferably about 10 to 90% by mass, more preferably about 30 to 80% by mass.
- the polypropylene layer 11 may be a single layer or two or more layers.
- one polypropylene layer 11 may be formed by successively laminating a plurality of layers made of the same or different polypropylene, and the plurality of layers may constitute one polypropylene layer 11.
- the polypropylene layer 11 preferably includes a layer made of block polypropylene.
- a preferred embodiment of the single polypropylene layer 11 is preferably a laminate of a layer composed of random polypropylene and a layer composed of block polypropylene, and in particular, a layer composed of random polypropylene and block polypropylene. It is preferable to have a laminated structure (three-layer structure) in which a layer constituted by the above and a layer constituted by random polypropylene are laminated in this order.
- the thickness of one polypropylene layer 11 is not particularly limited as long as the total thickness of the polypropylene layer 11 is within a range of 0.7 to 3.5 when the total thickness of the acid-modified polypropylene layer 12 is 1.
- it is preferably about 15 to 80 ⁇ m, more preferably about 20 to 70 ⁇ m.
- the details of the mechanism are not clear, but if the thickness of the acid-modified polypropylene layer is too large, the acid-modified polypropylene layer tends to cause cohesive failure and the adhesiveness of the adhesive film for metal terminals tends to decrease. It is in.
- the polypropylene layer 11 has the thickness of the metal terminal adhesive film 1 in the metal terminal adhesive film 1. Preferably, it occupies about 40% or more, more preferably occupies about 45% or more. As an upper limit, the polypropylene layer 11 preferably occupies about 85% or less of the thickness of the metal terminal adhesive film 1, More preferably, it occupies 80% or less. Preferable ranges of the thickness of the polypropylene layer 11 in the thickness of the metal terminal adhesive film 1 include about 40 to 85% and about 45 to 80%.
- the melting peak temperature of the polypropylene layer 11 is not particularly limited, but is preferably about 140 to 165 ° C. from the viewpoint of further improving the electrolytic solution resistance while further improving the adhesion with the packaging material and the metal terminal. More preferably, the temperature is about 150 to 160 ° C.
- the melting peak temperature of the polypropylene layer 11 is a value measured using a differential scanning calorimeter (DSC), the heating rate is 10 ° C./min, and the temperature measurement range is ⁇ 50 to 200 ° C. Measured using an aluminum pan as the sample pan.
- DSC differential scanning calorimeter
- the acid-modified polypropylene layer 12 is a layer made of acid-modified polypropylene.
- the acid-modified polypropylene layer 12 also preferably has a sea-island structure when the cross section is observed with an electron micrograph.
- the confirmation method of the sea-island structure in the acid-modified polypropylene layer 12 is the same as the confirmation method in the polypropylene layer 11 described above.
- the ratio of the area of the island portion is not particularly limited, but from the viewpoint of further improving the electrolytic solution resistance while further improving the adhesion with the packaging material and the metal terminal. Is preferably about 10 to 50%, more preferably about 20 to 40%.
- the method for measuring the ratio of the area of the island portion in the sea-island structure of the acid-modified polypropylene layer 12 is the same as the measurement method for the polypropylene layer 11 described above, except that the measurement target is the acid-modified polypropylene layer 12.
- the ratio of the area of an island part is 2% or less, it is evaluated that it does not have a sea island structure substantially.
- the acid-modified polypropylene is not particularly limited as long as it is an acid-modified polypropylene, and preferably a polypropylene graft-modified with an unsaturated carboxylic acid or an anhydride thereof.
- unsaturated carboxylic acid or anhydride thereof used for acid modification include maleic acid, acrylic acid, itaconic acid, crotonic acid, maleic anhydride, itaconic anhydride and the like.
- the acid-modified polypropylene is preferably crystalline or amorphous, such as homopolypropylene, polypropylene block copolymer (eg, propylene and ethylene block copolymer), and polypropylene random copolymer (eg, propylene and ethylene random copolymer). May be mentioned. Among these, it is preferable to contain a polypropylene block copolymer (block polypropylene) or a random copolymer of polypropylene (random polypropylene).
- the acid-modified polypropylene layer 12 can be analyzed by infrared spectroscopy, gas chromatography mass spectrometry, or the like, and the analysis method is not particularly limited.
- a peak derived from maleic acid is detected in the vicinity of the wave number of 1760 cm -1 and near the wave number 1780 cm -1.
- the peak may be small and may not be detected. In that case, it can be analyzed by nuclear magnetic resonance spectroscopy.
- the acid-modified polypropylene layer 12 may be only one layer or two or more layers.
- one acid-modified polypropylene layer 12 is formed by continuously laminating a plurality of layers made of the same or different acid-modified polypropylene, and the plurality of layers constitute one acid-modified polypropylene layer 12. May be.
- a preferred embodiment of the single acid-modified polypropylene layer 12 is a layer composed of maleic anhydride-modified polypropylene.
- the thickness of one acid-modified polypropylene layer 12 is particularly limited if the total thickness of the polypropylene layer 11 is within the range of 0.7 to 3.5 when the total thickness of the acid-modified polypropylene layer 12 is 1.
- the upper limit is, Preferably it is about 40 micrometers or less, More preferably, it is about 35 micrometers or less, More preferably, it is about 30 micrometers or less.
- the melting peak temperature of the acid-modified polypropylene layer 12 is not particularly limited, but is preferably 130 to 165 ° C. from the viewpoint of further improving the electrolytic solution resistance while further improving the adhesion between the packaging material and the metal terminal. About 140 ° C. to 160 ° C. is preferable.
- the melting peak temperature of the acid-modified polypropylene layer 12 is a value measured in the same manner as the method for measuring the melting peak temperature of the polypropylene layer 11.
- the softening point of the polypropylene layer 11 and the acid-modified polypropylene layer 12 The absolute value of the difference between the softening points is preferably about 40 ° C. or lower, more preferably about 30 ° C. or lower, more preferably about 20 ° C. or lower, and the lower limit is preferably about 0 ° C. or higher. Preferably about 5 degreeC or more, More preferably, about 10 degreeC or more is mentioned.
- the softening points of the polypropylene layer 11 and the acid-modified polypropylene layer 12 are values measured as follows.
- the cantilever model of the thermal probe is a value measured under conditions of EX-AN2-200 and a heating rate of 5 ° C./s.
- the softening point was the peak top temperature.
- the adhesive film 1 for metal terminals of the present invention may contain various additives such as a lubricant, an antioxidant, an ultraviolet absorber, and a light stabilizer, as necessary.
- a lubricant such as a lubricant, an antioxidant, an ultraviolet absorber, and a light stabilizer, as necessary.
- the adhesive film 1 for metal terminals may discolor.
- the content of the lubricant contained in the entire metal terminal adhesive film 1 is preferably about 0 to 2000 ppm.
- the content of the lubricant contained in the entire metal terminal adhesive film 1 is a value measured using a gas chromatograph mass spectrometer (GC-MS). Specifically, the additive in the adhesive film for metal terminals is extracted into methanol in boiling refluxed methanol, and the resulting methanol extract is analyzed by GC-MS to be used for metal terminals. The amount of lubricant contained in the entire adhesive film is measured.
- GC-MS gas chromatograph mass spectrometer
- the lubricant is not particularly limited, but preferably an amide lubricant.
- Specific examples of the amide-based lubricant include saturated fatty acid amide, unsaturated fatty acid amide, substituted amide, methylolamide, saturated fatty acid bisamide, unsaturated fatty acid bisamide, and the like.
- Specific examples of the saturated fatty acid amide include lauric acid amide, palmitic acid amide, stearic acid amide, behenic acid amide, hydroxy stearic acid amide and the like.
- Specific examples of the unsaturated fatty acid amide include oleic acid amide and erucic acid amide.
- substituted amide examples include N-oleyl palmitic acid amide, N-stearyl stearic acid amide, N-stearyl oleic acid amide, N-oleyl stearic acid amide, N-stearyl erucic acid amide and the like.
- methylolamide examples include methylol stearamide.
- saturated fatty acid bisamides include methylene bis stearamide, ethylene biscapric amide, ethylene bis lauric acid amide, ethylene bis stearic acid amide, ethylene bishydroxy stearic acid amide, ethylene bisbehenic acid amide, hexamethylene bis stearic acid amide.
- acid amide hexamethylene bisbehenic acid amide, hexamethylene hydroxystearic acid amide, N, N′-distearyl adipic acid amide, N, N′-distearyl sebacic acid amide, and the like.
- unsaturated fatty acid bisamides include ethylene bisoleic acid amide, ethylene biserucic acid amide, hexamethylene bisoleic acid amide, N, N′-dioleyl adipic acid amide, N, N′-dioleyl sebacic acid amide Etc.
- Specific examples of the fatty acid ester amide include stearoamidoethyl stearate.
- aromatic bisamide examples include m-xylylene bis stearic acid amide, m-xylylene bishydroxy stearic acid amide, N, N′-distearyl isophthalic acid amide and the like.
- One type of lubricant may be used alone, or two or more types may be used in combination.
- the metal terminal adhesive film 1 of the present invention may contain a filler as required.
- the filler functions as a spacer, so that a short circuit between the metal terminal 2 and the barrier layer 33 of the packaging material 3 can be more effectively performed. It becomes possible to suppress.
- the particle size of the filler is in the range of about 0.1 to 35 ⁇ m, preferably about 5.0 to 30 ⁇ m, more preferably about 10 to 25 ⁇ m.
- the polypropylene layer 11 and / or the acid-modified polypropylene layer 12 are included in the polypropylene layer 11 and / or the acid-modified polypropylene layer 12, and as content of a filler, the polypropylene layer 11 and an acid-modified polypropylene are included.
- inorganic fillers include carbon (carbon, graphite), silica, aluminum oxide, barium titanate, iron oxide, silicon carbide, zirconium oxide, zirconium silicate, magnesium oxide, titanium oxide, calcium aluminate, and calcium hydroxide.
- organic fillers include fluorine resin, phenol resin, urea resin, epoxy resin, acrylic resin, benzoguanamine / formaldehyde condensate, melamine / formaldehyde condensate, polymethyl methacrylate cross-linked product, polyethylene cross-linked product, etc. Can be mentioned.
- Aluminum oxide, silica, fluororesin, acrylic resin, and benzoguanamine / formaldehyde condensate are preferable from the viewpoint of shape stability, rigidity, and content resistance, and spherical aluminum oxide and silica are more preferable among them.
- a method of mixing the filler into the resin component that forms the polypropylene layer 11 and / or the acid-modified polypropylene layer 12 a method of melt-blending both in advance with a Banbury mixer or the like to obtain a master batch with a predetermined mixing ratio
- a direct mixing method with a resin component can be employed.
- the metal terminal adhesive film 1 may each contain a pigment as required.
- the pigment various inorganic pigments can be used.
- carbon (carbon, graphite) exemplified for the filler can be preferably exemplified.
- Carbon (carbon, graphite) is a material generally used in the battery, and there is no risk of elution from the electrolyte.
- a sufficient coloring effect can be obtained with an addition amount that has a large coloring effect and does not impair adhesiveness, and the apparent melt viscosity of the added resin can be increased without melting by heat.
- a pigment When a pigment is added to the metal terminal adhesive film 1, it is preferably contained in the polypropylene layer 11 and / or the acid-modified polypropylene layer 12, and the amount added is, for example, carbon black having a particle size of about 0.03 ⁇ m. Is used, about 0.05 to 0.3 parts by mass, preferably 0.1 to 0.2 parts by mass, respectively, with respect to 100 parts by mass of the resin component forming the polypropylene layer 11 and the acid-modified polypropylene layer 12. Degree.
- the presence or absence of the metal terminal adhesive film 1 can be detected by a sensor, or can be visually inspected.
- the filler and the pigment when the filler and the pigment are added to the polypropylene layer 11 and / or the acid-modified polypropylene layer 12, the filler and the pigment may be added to the same polypropylene layer 11 and / or the acid-modified polypropylene layer 12, From the viewpoint of not inhibiting the heat-fusibility of the metal terminal adhesive film 1, the filler and the pigment are preferably added separately to the polypropylene layer 11 and the acid-modified polypropylene layer 12.
- the metal terminal adhesive film 1 of the present invention can be produced by laminating at least one polypropylene layer and at least one acid-modified polypropylene layer.
- a method for laminating at least one polypropylene layer and at least one acid-modified polypropylene layer is not particularly limited, and for example, a thermal lamination method, a sandwich lamination method, an extrusion lamination method, or the like can be used.
- the method for interposing the metal terminal adhesive film 1 between the metal terminal 2 and the packaging material 3 is not particularly limited.
- the metal terminal 2 is sandwiched between the packaging materials 3 as shown in FIGS.
- the metal terminal adhesive film 1 may be wound around the metal terminal 2 in the portion to be formed.
- the metal terminal adhesive film 1 is disposed on both sides of the metal terminal 2 so that the metal terminal adhesive film 1 crosses the two metal terminals 2 at the portion where the metal terminal 2 is sandwiched by the packaging material 3. May be.
- the metal terminal adhesive film 1 of the present invention is used by being interposed between the metal terminal 2 and the packaging material 3.
- the metal terminal 2 (tab) is a member that is electrically connected to the electrode (positive electrode or negative electrode) of the battery element 4 and is made of a metal material.
- the metal material constituting the metal terminal 2 is not particularly limited, and examples thereof include aluminum, nickel, and copper.
- 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 connected to the negative electrode of a lithium ion battery is normally comprised with copper, nickel, etc.
- the surface of the metal terminal 2 is preferably subjected to chemical conversion treatment from the viewpoint of improving the resistance to electrolytic solution.
- specific examples of the chemical conversion treatment include known methods for forming an acid-resistant film such as phosphate, chromate, fluoride, and triazine thiol compound. .
- a phosphoric acid chromate treatment using a phenol resin, a chromium (III) fluoride compound, and phosphoric acid is preferably used.
- the size of the metal terminal 2 may be appropriately set according to the size of the battery used.
- the thickness of the metal terminal 2 is preferably about 50 to 1000 ⁇ m, more preferably about 70 to 800 ⁇ m.
- the length of the metal terminal 2 is preferably about 1 to 200 mm, more preferably about 3 to 150 mm.
- the width of the metal terminal 2 is preferably about 1 to 200 mm, more preferably about 3 to 150 mm.
- Examples of the packaging material 3 include those having a laminated structure including at least a base material layer 31, a barrier layer 33, and a heat-fusible resin layer 34 in this order.
- FIG. 6 shows an example in which a base material layer 31, an adhesive layer 32, a barrier layer 33, an adhesive layer 35, and a heat-fusible resin layer 34 are laminated in this order as an example of a cross-sectional structure of the packaging material 3. .
- the adhesive layer 32 is a layer provided as necessary for the purpose of improving the adhesion between the base material layer 31 and the barrier layer 33.
- the adhesive layer 35 is a layer provided as necessary for the purpose of improving the adhesion between the barrier layer 33 and the heat-fusible resin layer 34.
- the base material layer 31 is the outermost layer side, and the heat-fusible resin layer 34 is the innermost layer.
- the battery element 4 is hermetically sealed by bringing the heat-fusible resin layers 34 positioned at the periphery of the battery element 4 into contact with each other and heat-welding them, thereby sealing the battery element 4.
- 1 to 3 show a battery 10 using an embossed type packaging material 3 formed by embossing or the like
- the packaging material 3 may be a pouch type that is not molded. Good.
- the pouch type includes a three-side seal, a four-side seal, and a pillow type, but any type may be used.
- 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 material layer 31 is not particularly limited as long as it has insulating properties.
- Examples of the material for forming the base material layer 31 include polyester, polyamide, polyolefin, epoxy resin, acrylic resin, fluorine resin, polyurethane, silicon resin, phenol resin, polyetherimide, polyimide, and mixtures and copolymers thereof. Etc.
- the thickness of the base material layer 31 is, for example, about 10 to 50 ⁇ m, 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 as necessary.
- the adhesive layer 32 is formed of an adhesive capable of bonding the base material layer 31 and the barrier layer 33.
- the adhesive used for forming the adhesive layer 32 may be a two-component curable adhesive or a one-component curable adhesive. Further, the adhesive used for forming the adhesive layer 32 is not particularly limited, and may be any of a chemical reaction type, a solvent volatilization type, a heat melting type, a hot pressure type, and the like.
- the thickness of the adhesive layer 32 is, for example, about 2 to 50 ⁇ m, preferably about 3 to 25 ⁇ m.
- the barrier layer 33 is a layer having a function of preventing water vapor, oxygen, light, and the like from entering the battery, in addition to improving the strength of the battery packaging material.
- the metal constituting the barrier layer 33 include aluminum, stainless steel, and titanium, and preferably aluminum.
- the barrier layer 33 can be formed by, for example, a metal foil, a metal vapor-deposited film, an inorganic oxide vapor-deposited film, a carbon-containing inorganic oxide vapor-deposited film, a film provided with these vapor-deposited films, etc. Is preferable, and it is more preferable to form with an aluminum alloy foil.
- the barrier layer is made of, for example, annealed aluminum (JIS H4160: 1994 A8021H-O, JIS H4160: 1994 A8079H-O, JIS H4000: 2014 A8021P-O, JIS H4000: 2014 A8079P-O) and the like are more preferable.
- the thickness of the barrier layer 33 is not particularly limited as long as it functions as a barrier layer such as water vapor, but can be, for example, about 10 to 50 ⁇ m, preferably about 10 to 40 ⁇ m.
- the adhesive layer 35 is a layer provided as necessary between the barrier layer 33 and the heat-fusible resin layer 34 in order to firmly bond the heat-fusible resin layer 34.
- the adhesive layer 35 is formed of an adhesive capable of bonding the barrier layer 33 and the heat-fusible resin layer 34.
- an adhesive capable of bonding the barrier layer 33 and the heat-fusible resin layer 34.
- the resin composition containing acid-modified polyolefin is mentioned.
- the acid-modified polyolefin include the same as those described in the acid-modified polypropylene layer 12.
- polyethylene such as low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, and the like were acid-modified with unsaturated carboxylic acid or an anhydride thereof (for example, those exemplified in the acid-modified polypropylene layer 12). A thing can also be illustrated.
- the thickness of the adhesive layer 35 is, for example, about 1 to 40 ⁇ m, preferably about 2 to 30 ⁇ m.
- the heat-fusible resin layer 34 corresponds to the innermost layer, and is a layer that heat-welds the heat-fusible resin layers to each other to seal the battery element when the battery is assembled.
- the resin component used for the heat-fusible resin layer 34 is not particularly limited as long as it can be heat-welded, and examples thereof include polyolefin and acid-modified polyolefin.
- polystyrene resin examples include the same ones exemplified in the polypropylene layer 11 and polyethylenes such as low density polyethylene, medium density polyethylene, high density polyethylene, and linear low density polyethylene.
- polyethylenes such as low density polyethylene, medium density polyethylene, high density polyethylene, and linear low density polyethylene.
- acid-modified polyolefin examples include the same as those described for the adhesive layer 35.
- the thickness of the heat-fusible resin layer 34 is not particularly limited, but is preferably about 2 to 2000 ⁇ m, more preferably about 5 to 1000 ⁇ m, and further preferably about 10 to 500 ⁇ m.
- the battery 10 of the present invention includes a battery element 4 including at least a positive electrode, a negative electrode, and an electrolyte; a packaging material 3 that seals the battery element 4; 3 and a metal terminal 2 projecting to the outside.
- the battery 10 of the present invention is characterized in that the metal terminal adhesive film 1 of the present invention is interposed between the metal terminal 2 and the packaging material 3.
- the metal element of the present invention is formed by packaging the battery element 4 including at least the positive electrode, the negative electrode, and the electrolyte with the packaging material 3 and the metal terminals 2 connected to each of the positive electrode and the negative electrode protruding outward.
- the terminal adhesive film 1 is interposed between the metal terminal 2 and the heat-fusible resin layer 34, and the flange portion of the packaging material (in the region where the heat-fusible resin layers 34 are in contact with each other at the periphery of the battery element 4.
- the battery 10 using the packaging material 3 is provided by covering the peripheral edge portion 3a) of the packaging material so as to be formed and heat-sealing and sealing the heat-fusible resin layers 34 of the flange portion.
- the packaging material 3 is used so that the heat-fusible resin layer 34 of the packaging material 3 is on the inner side (surface in contact with the battery element 4).
- the battery of the present invention may be either a primary battery or a secondary battery, but is preferably a secondary battery.
- the type of secondary battery is not particularly limited.
- lithium ion battery, lithium ion polymer battery, lead battery, nickel / hydrogen battery, nickel / cadmium battery, nickel / iron battery, nickel / zinc battery Examples include batteries, silver oxide / zinc livestock batteries, metal-air batteries, multivalent cation batteries, capacitors, capacitors, and the like.
- a lithium ion battery and a lithium ion polymer battery are preferable.
- the packaging material is about 10 to 65 ⁇ m
- the thickness of the metal terminal is about 50 to 1000 ⁇ m
- the preferred thickness of the metal terminal adhesive film is about 30 to 80 ⁇ m
- the total of the preferable thickness of the packaging material and the preferable thickness of the metal terminal adhesive film is about 40 to 145 ⁇ m.
- the adhesive film for metal terminals was measured using a differential scanning calorimeter (DSC).
- DSC differential scanning calorimeter
- the measurement conditions were a heating rate of 10 ° C./min, a temperature measurement range of ⁇ 50 to 200 ° C., and an aluminum pan was used as a sample pan.
- the adhesive film for metal terminals was cut into a size of 50 mm (MD) ⁇ 4 mm (TD) in width and used as a test piece.
- the length M (mm) of the test piece was measured with a metal scale.
- the end in the length direction of the test piece was fixed to the wire mesh with tape, and the test piece was suspended from the wire mesh. In this state, after placing in an oven heated to 190 ° C. for 120 seconds, the test piece was taken out together with the wire mesh, and naturally cooled in a room temperature (25 ° C.) environment.
- the length N (mm) of the test piece naturally cooled to room temperature was measured with a metal ruler.
- the packaging material 3 was cut into a size of length 150 mm (MD) ⁇ width 60 mm (TD). Moreover, the adhesive film 1 for metal terminals was cut out to the size of length 75mm (MD) x width 60mm (TD). Moreover, the metal terminal 2 (Aluminum plate, length 60mm, width 25mm, thickness 0.1mm) was prepared. Next, as shown in the schematic diagram of FIG. 8, the packaging material 3 was folded in the longitudinal direction at the position of the center P of the MD so that the heat-fusible resin layer was inside.
- the metal terminal adhesive film 1 and the metal terminal 2 are overlapped and folded into two as shown in the schematic diagram of FIG. Inserted between Material 3.
- the acid-modified polypropylene layer of the metal terminal adhesive film 1 was disposed so as to be in contact with the metal terminal 2.
- a cross-sectional view from the side is shown in FIG. 8b.
- heat sealing is performed from both sides of the packaging material 3 under conditions of a seal width of 7.0 mm, a seal temperature of 190 ° C., a surface pressure of 1.0 MPa, and a seal time of 3 seconds.
- a laminate was obtained.
- the direction of the seal width corresponds to the MD of the packaging material.
- the sample was cut out from the laminated body at the position of the two-dot chain line in the schematic diagram of FIG. 9B so that the width of the heat-sealed portion S (TD of the packaging material) was 15 mm.
- the sample packaging material 3 and the metal terminal adhesive film 1 thus obtained were separated in the direction of 180 ° to the position of the heat-sealed portion S.
- a cross-sectional view of the sample in this state as viewed from the side is shown in FIG. 9c.
- the seal strength (N / 15 mm) was measured under the conditions of a speed of 300 mm / min, a distance between chucks of 50 mm, and a peeling method being a T-shaped peeling method. .
- a tensile tester AG-Xplus manufactured by Shimadzu Corporation
- the adhesive film for metal terminals was cut into a size of 15 mm (MD) ⁇ 100 mm (TD) to obtain a test piece.
- the test piece was taken out and washed with water, and the test piece was visually observed.
- the case where the test piece was not peeled off was designated as “A”, and the case where the test piece was peeled off was designated as “C”.
- An aluminum plate (pure aluminum type, JIS H4160-1994 A1N30H-O) having a length of 60 mm, a width of 25 mm, and a thickness of 100 ⁇ m and an adhesive film for a metal terminal having a length of 70 mm and a width of 5 mm were prepared.
- the thickness A ( ⁇ m) of the adhesive film for metal terminals was measured with a micro gauge.
- the adhesive film for metal terminals was overlapped on the center portion of the aluminum plate so that the length direction and the width direction of the aluminum plate and the adhesive film for metal terminals coincided.
- two metal plates longer than the length of the aluminum plate and having a width of 7 mm are prepared.
- the temperature is measured from above and below the metal terminal adhesive film so as to cover the entire surface of the metal terminal adhesive film. Heating and pressing were performed under the conditions of 190 ° C., surface pressure of 1.27 MPa, and time of 3 seconds to obtain a laminate of an aluminum plate and an adhesive film for metal terminals.
- the thickness B ( ⁇ m) of the portion where the laminate was heated and pressed was measured with a micro gauge.
- the stained section is observed with a field emission scanning electron microscope (for example, S-4800 TYPE1, manufactured by Hitachi High-Technologies Corporation, measurement condition: 3 kV 20 mA High WD 6 mm detector (Upper)), and an image (magnification is 10,000 times). I got it.
- image processing software that can binarize the image for example, image analysis software WinROOF (Ver 7.4) manufactured by Mitani Corporation) is used to binarize the island portion and the ocean portion of the sea-island structure for the image. The ratio of the area occupied by the island portion (the total area of the island portion / the area of the image measurement range) was determined.
- the specific image processing conditions are as follows.
- Example 1 As a polypropylene layer, an unstretched polypropylene film (CPP, total thickness 50 ⁇ m, melting peak temperature 155) of a three-layer structure in which a random polypropylene layer (6 ⁇ m) / block polypropylene layer (38 ⁇ m) / random polypropylene layer (6 ⁇ m) are sequentially laminated. ° C) was prepared.
- CPP unstretched polypropylene film
- maleic anhydride-modified polypropylene is laminated on both sides of the unstretched polypropylene film by extrusion lamination, and the acid-modified polypropylene layer (25 ⁇ m) / polypropylene layer (50 ⁇ m) / acid-modified polypropylene layer (25 ⁇ m) are sequentially formed.
- a laminated adhesive film for metal terminals was produced. About the obtained adhesive film for metal terminals, when the heat shrinkage rate was measured, it showed a high value of 83.0%.
- Example 2 As a polypropylene layer, a three-layer unstretched polypropylene film (CPP, total thickness 60 ⁇ m, melting peak temperature 155) in which a random polypropylene layer (8 ⁇ m) / block polypropylene layer (44 ⁇ m) / random polypropylene layer (8 ⁇ m) are sequentially laminated. ° C) was prepared. Next, maleic anhydride-modified polypropylene is laminated on both sides of the unstretched polypropylene film by extrusion lamination, and the acid-modified polypropylene layer (20 ⁇ m) / polypropylene layer (60 ⁇ m) / acid-modified polypropylene layer (20 ⁇ m) are sequentially formed. A laminated adhesive film for metal terminals was produced. About the obtained adhesive film for metal terminals, when the heat shrinkage rate was measured, it showed a high value of 81.3%.
- Example 3 As a polypropylene layer, an unstretched polypropylene film (CPP, total thickness 50 ⁇ m, melting peak temperature 155) of a three-layer structure in which a random polypropylene layer (6 ⁇ m) / block polypropylene layer (38 ⁇ m) / random polypropylene layer (6 ⁇ m) are sequentially laminated. ° C) was prepared. Next, maleic anhydride-modified polypropylene is laminated on one side of the unstretched polypropylene film by extrusion lamination to produce an adhesive film for metal terminals in which an acid-modified polypropylene layer (16 ⁇ m) / polypropylene layer (50 ⁇ m) is laminated. did. About the obtained adhesive film for metal terminals, when the thermal contraction rate was measured, it showed a high value of 80.1%.
- Example 4 As a polypropylene layer, a three-layer unstretched polypropylene film (CPP, total thickness 30 ⁇ m, melting peak temperature 155) in which a random polypropylene layer (4 ⁇ m) / block polypropylene layer (22 ⁇ m) / random polypropylene layer (4 ⁇ m) are sequentially laminated. ° C) was prepared. Next, maleic anhydride-modified polypropylene is laminated on one side of the unstretched polypropylene film by extrusion lamination to produce an adhesive film for metal terminals in which an acid-modified polypropylene layer (36 ⁇ m) / polypropylene layer (30 ⁇ m) is laminated. did. When the thermal contraction rate was measured about the obtained adhesive film for metal terminals, it showed a high value of 88.1%.
- Example 5 As a polypropylene layer, a three-layer unstretched polypropylene film (CPP, total thickness 30 ⁇ m, melting peak temperature 155) in which a random polypropylene layer (4 ⁇ m) / block polypropylene layer (22 ⁇ m) / random polypropylene layer (4 ⁇ m) are sequentially laminated. ° C) was prepared. Next, maleic anhydride-modified polypropylene is laminated on both sides of the unstretched polypropylene film by extrusion lamination, and the acid-modified polypropylene layer (18 ⁇ m) / polypropylene layer (30 ⁇ m) / acid-modified polypropylene layer (18 ⁇ m) are sequentially formed. A laminated adhesive film for metal terminals was produced. When the thermal contraction rate was measured about the obtained adhesive film for metal terminals, it showed a high value of 88.1%.
- Example 6 As the polypropylene layer, an unstretched polypropylene film (CPP, total thickness 60 ⁇ m, melting peak temperature 159 ° C.) of a block polypropylene layer (60 ⁇ m) was prepared. Next, maleic anhydride-modified polypropylene is laminated on both sides of the unstretched polypropylene film by extrusion lamination, and the acid-modified polypropylene layer (20 ⁇ m) / polypropylene layer (60 ⁇ m) / acid-modified polypropylene layer (20 ⁇ m) are sequentially formed. A laminated adhesive film for metal terminals was produced. About the obtained adhesive film for metal terminals, when the heat shrinkage rate was measured, it showed a high value of 81.7%.
- Example 7 As a polypropylene layer, a three-layer unstretched polypropylene film (CPP, total thickness 30 ⁇ m, melting peak temperature 155) in which a random polypropylene layer (4 ⁇ m) / block polypropylene layer (22 ⁇ m) / random polypropylene layer (4 ⁇ m) are sequentially laminated. ° C) was prepared. Next, a metal in which maleic anhydride-modified polypropylene is laminated on both surfaces of an unstretched polypropylene film by extrusion lamination, and an acid-modified polypropylene layer (16 ⁇ m) / polypropylene layer (30 ⁇ m) / acid-modified polypropylene (16 ⁇ m) is laminated. An adhesive film for terminals was produced. When the thermal contraction rate was measured about the obtained adhesive film for metal terminals, it showed a high value of 88.7%.
- a polypropylene layer As a polypropylene layer, a three-layer unstretched polypropylene film (CPP, total thickness 30 ⁇ m, melting peak temperature 155) in which a random polypropylene layer (4 ⁇ m) / block polypropylene layer (22 ⁇ m) / random polypropylene layer (4 ⁇ m) are sequentially laminated. ° C) was prepared. Next, maleic anhydride-modified polypropylene is laminated on both sides of the unstretched polypropylene film by extrusion lamination, and the acid-modified polypropylene layer (35 ⁇ m) / polypropylene layer (30 ⁇ m) / acid-modified polypropylene layer (35 ⁇ m) are sequentially formed. A laminated adhesive film for metal terminals was produced.
- CPP three-layer unstretched polypropylene film
- an unstretched polypropylene film (CPP, total thickness 25 ⁇ m, melting peak temperature 155) having a three-layer structure in which a random polypropylene layer (3 ⁇ m) / block polypropylene layer (3 ⁇ m) / random polypropylene layer (19 ⁇ m) are sequentially laminated. ° C) was prepared.
- maleic anhydride-modified polypropylene is laminated on one side of the unstretched polypropylene film by extrusion lamination to produce an adhesive film for metal terminals in which an acid-modified polypropylene layer (41 ⁇ m) / polypropylene layer (25 ⁇ m) is laminated. did.
- an oriented polypropylene film (OPP, homopolypropylene, thickness 50 ⁇ m, melting peak temperature 165 ° C.) was prepared.
- maleic anhydride-modified polypropylene is laminated on both sides of the stretched polypropylene film by extrusion lamination, and an acid-modified polypropylene layer (25 ⁇ m) / polypropylene layer (50 ⁇ m) / acid-modified polypropylene layer (25 ⁇ m) are sequentially laminated.
- An adhesive film for a metal terminal was manufactured.
- An aluminum foil (thickness 40 ⁇ m) was prepared by chemical conversion treatment (phosphoric acid chromate treatment) on both sides with a chemical conversion treatment solution composed of a phenol resin, a chromium fluoride (trivalent) compound, and phosphoric acid. Next, one surface of this aluminum foil and a biaxially stretched nylon film (thickness 25 ⁇ m) were laminated via a urethane adhesive.
- the other surface of the aluminum foil and an unstretched polypropylene film are sandwich-laminated with an acid-modified polypropylene resin (thickness 15 ⁇ m, polypropylene graft-modified with unsaturated carboxylic acid), and the acid-modified polypropylene is heated with hot air.
- Packaging in which biaxially stretched nylon film (25 ⁇ m) / aluminum foil (thickness 40 ⁇ m) / acid-modified polypropylene resin (thickness 15 ⁇ m) / unstretched polypropylene film (15 ⁇ m) are laminated in order by heating to a temperature above the softening point of the resin The material was manufactured. Using the obtained packaging material, the above-described seal strength was measured.
- PP means polypropylene and PPa means acid-modified polypropylene.
- the acid-modified polypropylene layer is at least one surface of the adhesive film for metal terminals.
- the cross section of the polypropylene layer is observed with a scanning electron micrograph, the sea-island structure is observed.
- the polypropylene layer has a sealing strength (that is, adhesion) between the packaging material and the metal terminals. It can be seen that it is high and also excellent in resistance to electrolyte.
- the polypropylene layer has the above-mentioned sea-island structure, but the total thickness of the polypropylene layer is outside the range of 0.7 to 3.5 when the total thickness of the acid-modified polypropylene layer is 1.
- the adhesive films for metal terminals of Examples 1 and 2 were inferior in adhesion to the packaging material and the metal terminals.
- the adhesive film for metal terminals of Comparative Example 3 that satisfies the above range but does not have the above-mentioned sea-island structure in the polypropylene layer, the adhesiveness to the packaging material and the metal terminals and the electrolytic solution resistance It was inferior to.
- the sea-island structure of the polypropylene layer has a large value of 28.0% or more when the island part area is measured by binarization, and the acid-modified polypropylene layer also had a large value of 24.5% or more.
- Comparative Example 3 when the island area was measured by binarization for the sea-island structure of the polypropylene layer, the ratio of the area was a very low value of 1.57%, substantially having a sea-island structure. It was confirmed that they did not.
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Abstract
Description
項1. 電池素子の電極に電気的に接続された金属端子と、前記電池素子を封止する包装材料との間に介在される、金属端子用接着性フィルムであって、
前記金属端子用接着性フィルムは、少なくとも1層のポリプロピレン層と、少なくとも1層の酸変性ポリプロピレン層とを備える積層体から構成されており、
前記酸変性ポリプロピレン層が、前記金属端子用接着性フィルムの少なくとも片面側の表層を構成しており、
前記ポリプロピレン層は、断面を電子顕微鏡写真で観察した際に海島構造が観察され、
前記酸変性ポリプロピレン層の合計厚さを1とした場合に、前記ポリプロピレン層の合計厚さが、0.7以上3.5以下の範囲内にある、金属端子用接着性フィルム。
項2. 前記ポリプロピレン層は、ブロックポリプロピレンを含んでいる、項1に記載の金属端子用接着性フィルム。
項3. 前記ポリプロピレン層は、未延伸ポリプロピレンにより構成されている、項1または2に記載の金属端子用接着性フィルム。
項4. 前記ポリプロピレン層は、ランダムポリプロピレンにより構成された層と、ブロックポリプロピレンにより構成された層と、ランダムポリプロピレンにより構成された層とがこの順に積層された積層構成を有している、項1~3のいずれかに記載の金属端子用接着性フィルム。
項5. 前記金属端子用接着性フィルムを示差走査熱量計で測定した場合に、150℃以上165℃以下の範囲に融解ピークが観察される、項1~4のいずれかに記載の金属端子用接着性フィルム。
項6. 以下の測定方法で測定される、前記金属端子用接着性フィルムの厚さ残存率が、50%以上である、項1~5のいずれかに記載の金属端子用接着性フィルム。
厚さ100μmのアルミニウム板と、前記金属端子用接着性フィルムを用意する。
前記金属端子用接着性フィルムの厚さA(μm)を測定する。
前記アルミニウム板及び前記金属端子用接着性フィルムの長さ方向及び幅方向が一致するようにして、前記アルミニウム板の中心部分に前記金属端子用接着性フィルムを重ねる。
前記アルミニウム板の長さより長く、幅7mmの金属板を2枚用意し、前記金属端子用接着性フィルムの全面を覆うようにして、前記アルミニウム板と前記金属端子用接着性フィルムの上下から、温度190℃、面圧1.27MPa、時間3秒間の条件で、前記金属板で加熱及び加圧を行い、前記アルミニウム板と前記金属端子用接着性フィルムの積層体を得る。
当該積層体の加熱及び加圧が行われた部分の厚さB(μm)を測定する。
以下の式によって、前記金属端子用接着性フィルムの厚さ残存率を算出する。
金属端子用接着性フィルムの厚さ残存率(%)=(厚さB-100)/厚さA×100
項7. 前記金属端子用接着性フィルムの流れ方向の熱収縮率が、70~90%である、項1~6のいずれかに記載の金属端子用接着性フィルム。
項8. 前記包装材料が、少なくとも、基材層、バリア層、及び熱融着性樹脂層をこの順に備える積層体から構成されており、
前記熱融着性樹脂層と前記金属端子との間に前記金属端子用接着性フィルムが介在される、項1~7のいずれかに記載の金属端子用接着性フィルム。
項9. 少なくとも、正極、負極、及び電解質を備えた電池素子と、当該電池素子を封止する包装材料と、前記正極及び前記負極のそれぞれに電気的に接続され、前記包装材料の外側に突出した金属端子とを備える電池であって、
前記金属端子と前記包装材料との間に、項1~8のいずれかに記載の金属端子用接着性フィルムが介在されてなる、電池。
項10. 少なくとも1層のポリプロピレン層と、少なくとも1層の酸変性ポリプロピレン層とを備える積層体の使用であって、
前記酸変性ポリプロピレン層が、前記金属端子用接着性フィルムの少なくとも片面側の表層を構成しており、
前記ポリプロピレン層は、断面を電子顕微鏡写真で観察した際に海島構造が観察され、
前記酸変性ポリプロピレン層の合計厚さを1とした場合に、前記ポリプロピレン層の合計厚さが、0.7以上3.5以下の範囲内にあり、
電池素子の電極に電気的に接続された金属端子と、前記電池素子を封止する包装材料との間に介在される、金属端子用接着性フィルムとしての前記積層体の使用。
本発明の金属端子用接着性フィルムは、電池素子の電極に電気的に接続された金属端子と、電池素子を封止する包装材料との間に介在されるものである。具体的には、例えば図1~3に示されるように、本発明の金属端子用接着性フィルム1は、電池素子4の電極に電気的に接続されている金属端子2と、電池素子4を封止する包装材料3との間に介在されている。また、金属端子2は、包装材料3の外側に突出しており、ヒートシールされた包装材料3の周縁部3aにおいて、金属端子用接着性フィルム1を介して、包装材料3に挟持されている。なお、本発明において、包装材料をヒートシールする際の熱としては、通常160~220℃程度の範囲、圧力としては、通常0.5~2.0MPa程度の範囲である。
厚さ100μmのアルミニウム板(純アルミニウム系、JIS H4160-1994 A1N30H-O)と、金属端子用接着性フィルムを用意する。金属端子用接着性フィルムの厚さA(μm)をマイクロゲージで測定する。アルミニウム板及び金属端子用接着性フィルムの長さ方向及び幅方向が一致するようにして、アルミニウム板の中心部分に金属端子用接着性フィルムを重ねる。このとき、金属端子用接着性フィルムの酸変性ポリプロピレン層とアルミニウム板とが接するように配置する。アルミニウム板の長さより長く、幅7mmの金属板を2枚用意し、金属端子用接着性フィルムの全面を覆うようにして、アルミニウム板と金属端子用接着性フィルムの上下から、温度190℃、面圧1.27MPa、時間3秒間の条件で、加熱及び加圧を行い、アルミニウム板と金属端子用接着性フィルムの積層体を得る。当該積層体の加熱及び加圧が行われた部分の厚さB(μm)をマイクロゲージで測定する。以下の式によって、前記金属端子用接着性フィルムの厚さ残存率を算出する。
金属端子用接着性フィルムの厚さ残存率(%)=(厚さB-100)/厚さA×100
なお、長さ方向とは対象物の平面視の長辺に対応する長手方向であり、幅方向とは対象物の平面視の短辺に対応する短手方向である。長さ方向と幅方向の大きさが一致する場合(正方形)はどちらを長さ方向、幅方向としてもよい。
金属端子用接着性フィルムを長さ50mm(MD)×幅4mm(TD)のサイズに切り出して試験片とする。次に、金尺にて試験片の長さM(mm)を計測する。次に、試験片の長さ方向の端部を金網にテープで固定し、試験片を金網から吊るした状態にする。この状態で、190℃に加熱されたオーブン内に120秒置いた後、試験片を金網ごと取出して、室温(25℃)環境で自然冷却する。次に、室温まで自然冷却した試験片の長さN(mm)を金尺にて測定する。下の式により、金属端子用接着性フィルムの熱収縮率を算出する。
熱収縮率(%)=(長さN/長さM)×100
本発明において、ポリプロピレン層11は、ポリプロピレンにより構成された層である。また、ポリプロピレン層11は、断面を電子顕微鏡写真で観察した際に海島構造が観察される。ポリプロピレン層11の断面に海島構造が観察されるとは、例えば図11に示される電子顕微鏡写真のように、海の部分と島の部分とが観察されることをいう。図11は、「高分子ミクロ写真集 目で見る高分子 1.分子集合の形と働き」(編者:社団法人高分子学会、発行者:山本格、発行所:株式会社培風館、昭和61年5月30日初版発行)の第29頁に「C」として示されている透過電子顕微鏡写真(スケールバーは5μm)である。ポリプロピレン層11の断面に海島構造は、図11のように、ポリプロピレン層の断面を四酸化オスミウム(OsO4)染色して電子顕微鏡写真を観察することによって確認することができる。なお、図11では海部分が島部分よりも明るくなっているが測定方法、条件によっては、海部分が島部分よりも暗く観える場合もある。何れにせよ、海部分と島部分が判別できれば海島構造における島の部分の面積の割合は測定可能である。
熱硬化性のエポキシ樹脂内に金属端子用接着性フィルムを包埋し硬化させる。市販品の回転式ミクロトーム(LEICA製 UC6)と、ダイヤモンドナイフを用いて目的とする方向の断面(TDに沿った断面)を作製し、その際、液体窒素を用いたクライオミクロトームにて、-70℃にて断面作製を行う。包埋樹脂ごと四酸化ルテニウムにて一晩染色する。染色すると、ポリプロピレンが膨張するため、膨張部分をミクロトームでトリミングし、100nmほどの厚みでさらに1から2μmほど切断した部分について次のように観察する。染色した断面は、電界放出形走査型電子顕微鏡(例えば、日立ハイテクノロジーズ社製 S-4800 TYPE1,測定条件:3kV 20mA High WD6mm 検出器(Upper))で観測して画像(倍率は10000倍)を取得する。次に、画像を二値化できる画像処理ソフト(例えば、三谷商事製画像解析ソフトWinROOF(Ver7.4)を用い、当該画像について、海島構造の島の部分と海の部分とを二値化して、島の部分の占める面積の割合(島の部分の合計面積/画像の測定範囲の面積)を求める。具体的な画像処理の条件については、例えば実施例に記載の条件を採用する。
本発明において、酸変性ポリプロピレン層12は、酸変性ポリプロピレンにより構成された層である。酸変性ポリプロピレン層12についても、断面を電子顕微鏡写真で観察した際に海島構造が観察されることが好ましい。なお、酸変性ポリプロピレン層12における海島構造の確認方法は、前述のポリプロピレン層11における確認方法と同様である。
走査型熱顕微鏡(Anasys社製のNanoTA)を用い、サーマルプローブのカンチレバーのモデルはEX-AN2-200、昇温速度5℃/sの条件で測定された値である。また、軟化点は、ピークトップ温度とした。
金属端子用接着性フィルム1全体に含まれている滑剤の含有量は、ガスクロマトグラフ質量分析計(GC-MS)を用いて測定した値である。具体的には、沸騰環流させたメタノール中にて、金属端子用接着性フィルム内の添加剤をメタノール中に抽出し、得られたメタノール抽出液を、GC-MSで分析して、金属端子用接着性フィルム全体に含まれる滑剤量を測定する。
本発明の金属端子用接着性フィルム1は、金属端子2と包装材料3との間に介在させて使用される。金属端子2(タブ)は、電池素子4の電極(正極または負極)に電気的に接続される部材であり、金属材料により構成されている。金属端子2を構成する金属材料としては、特に制限されず、例えば、アルミニウム、ニッケル、銅などが挙げられる。例えば、リチウムイオン電池の正極に接続される金属端子2は、通常、アルミニウムなどにより構成されている。また、リチウムイオン電池の負極に接続される金属端子は、通常、銅、ニッケルなどにより構成されている。
包装材料3としては、少なくとも、基材層31、バリア層33、及び熱融着性樹脂層34をこの順に有する積層体からなる積層構造を有するものが挙げられる。図6に、包装材料3の断面構造の一例として、基材層31、接着剤層32、バリア層33、接着層35、及び熱融着性樹脂層34がこの順に積層されている態様について示す。接着剤層32は、基材層31とバリア層33との密着性を高めることなどを目的として、必要に応じて設けられる層である。また、接着層35は、バリア層33と熱融着性樹脂層34の密着性を高めることなどを目的として、必要に応じて設けられる層である。
包装材料3において、基材層31は、包装材料の基材として機能する層であり、最外層を形成する層である。
包装材料3において、接着剤層32は、基材層31に密着性を付与させるために、基材層31上に必要に応じて配置される層である。即ち、接着剤層32は、基材層31とバリア層33の間に必要に応じて設けられる。
包装材料において、バリア層33は、電池用包装材料の強度向上の他、電池内部に水蒸気、酸素、光などが侵入することを防止する機能を有する層である。バリア層33を構成する金属としては、具体的には、アルミニウム、ステンレス、チタンなどが挙げられ、好ましくはアルミニウムが挙げられる。バリア層33は、例えば、金属箔や金属蒸着膜、無機酸化物蒸着膜、炭素含有無機酸化物蒸着膜、これらの蒸着膜を設けたフィルムなどにより形成することができ、金属箔により形成することが好ましく、アルミニウム合金箔により形成することがさらに好ましい。電池用包装材料の製造時に、バリア層33にしわやピンホールが発生することを防止する観点からは、バリア層は、例えば、焼きなまし処理済みのアルミニウム(JIS H4160:1994 A8021H-O、JIS H4160:1994 A8079H-O、JIS H4000:2014 A8021P-O、JIS H4000:2014 A8079P-O)など軟質アルミニウム合金箔により形成することがより好ましい。
包装材料3において、接着層35は、熱融着性樹脂層34を強固に接着させるために、バリア層33と熱融着性樹脂層34の間に、必要に応じて設けられる層である。
包装材料3において、熱融着性樹脂層34は、最内層に該当し、電池の組み立て時に熱融着性樹脂層同士が熱溶着して電池素子を密封する層である。
本発明の電池10は、少なくとも、正極、負極、及び電解質を備えた電池素子4と、当該電池素子4を封止する包装材料3と、正極及び負極のそれぞれに電気的に接続され、包装材料3の外側に突出した金属端子2とを備えている。本発明の電池10においては、金属端子2と包装材料3との間に、本発明の金属端子用接着性フィルム1が介在されてなることを特徴とする。
示差走査熱量計(DSC)を用いて金属端子用接着性フィルムを測定した。装置としては、島津製作所の「DSC-60 Plus」を用いた。また、測定条件は、昇温速度を10℃/min、温度測定範囲を-50~200℃とし、サンプルパンとしてアルミニウムパンを使用した。
金属端子用接着性フィルムを長さ50mm(MD)×幅4mm(TD)のサイズに切り出して試験片とした。次に、金尺にて試験片の長さM(mm)を計測した。次に、試験片の長さ方向の端部を金網にテープで固定し、試験片を金網から吊るした状態にした。この状態で、190℃に加熱されたオーブン内に120秒置いた後、試験片を金網ごと取出して、室温(25℃)環境で自然冷却した。次に、室温まで自然冷却した試験片の長さN(mm)を金尺にて測定した。以下の式により、金属端子用接着性フィルムの熱収縮率を算出した。
熱収縮率(%)=(長さN/長さM)×100
図7の模式図に示すように、包装材料3を長さ150mm(MD)×幅60mm(TD)のサイズに切り出した。また、金属端子用接着性フィルム1を長さ75mm(MD)×幅60mm(TD)のサイズに切り出した。また、金属端子2(アルミニウム板、長さ60mm、幅25mm、厚み0.1mm)を用意した。次に、図8の模式図に示すように、熱融着性樹脂層が内側になるようにして、MDの中心Pの位置で、包装材料3を長さ方向に2つ折りにした。次に、金属端子用接着性フィルム1と金属端子2(アルミニウム板、長さ60mm、幅25mm、厚み0.1mm)とを重ね、図8の模式図に示すようにして、2つ折りにした包装材料3の間に挿入した。このとき、金属端子用接着性フィルム1の酸変性ポリプロピレン層が、金属端子2に接するように配置した。横から見た断面図を図8bに示す。この状態で、図9aの模式図に示すように、シール幅7.0mm、シール温度190℃、面圧1.0MPa、シール時間3秒間の条件で、包装材料3の両側からヒートシールを行い、積層体を得た。図9のヒートシールされた部分Sにおいて、シール幅の方向が包装材料のMDに対応する。次に、ヒートシールされた部分Sの幅(包装材料のTD)が15mmとなるようにして、図9bの模式図の二点鎖線の位置で、積層体からサンプルを切り出した。得られたサンプルの包装材料3と金属端子用接着性フィルム1とを、ヒートシールされた部分Sの位置まで、180°方向に離間させた。この状態のサンプルを横から見た断面図を図9cに示す。次に、引張試験機(島津製作所社製のAG-Xplus)を用い、速度300mm/min、チャック間距離50mm、剥離方法はT字剥離方法の条件で、シール強度(N/15mm)を測定した。このとき、図10に示すように、包装材料3/金属端子用接着性フィルム1/金属端子2/包装材料3が順に積層されている積層体において、「金属端子用接着性フィルム1/金属端子2/包装材料3」の部分を下のチャックで挟み、180°方向に離間させた包装材料3を上のチャックで挟んだ状態で、包装材料3と金属端子用接着性フィルム1とを剥離させてシール強度を測定した。
金属端子用接着性フィルムを15mm(MD)×100mm(TD)のサイズに切り出して試験片とした。次に、試験片を電解液(1M LiPF6の溶液(エチレンカーボネート:ジメチルカーボネート:ジエチルカーボネート=1:1:1、体積比)に浸漬し、85℃のオーブン内で24時間保管した。次に、試験片を取り出し、水で洗浄した後、試験片を目視で観察した。試験片の層間が剥離していなかった場合を「A」とし、試験片の層間が剥離していた場合を「C」とした。
長さ60mm、幅25mm、厚さ100μmのアルミニウム板(純アルミニウム系、JIS H4160-1994 A1N30H-O)と、長さ70mm、幅5mmの前記金属端子用接着性フィルムを用意した。次に、金属端子用接着性フィルムの厚さA(μm)をマイクロゲージで測定した。次に、アルミニウム板及び金属端子用接着性フィルムの長さ方向及び幅方向が一致するようにして、アルミニウム板の中心部分に金属端子用接着性フィルムを重ねた。次に、アルミニウム板の長さよりも長く、幅7mmの金属板を2枚用意し、次に、金属端子用接着性フィルムの全面を覆うようにして、金属端子用接着性フィルムの上下から、温度190℃、面圧1.27MPa、時間3秒間の条件で、加熱及び加圧を行い、アルミニウム板と金属端子用接着性フィルムの積層体を得た。次に、当該積層体の加熱及び加圧が行われた部分の厚さB(μm)をマイクロゲージで測定した。以下の式によって、金属端子用接着性フィルムの厚さ残存率を算出した。このとき、厚さBは、積層体の中心部1箇所と、積層体の長さ方向の両端部(アルミニウム板と金属端子用接着性フィルムとが積層されている部分の両端部)から前記中心部に向かって10mmの2箇所の合計3箇所の平均値とした。
金属端子用接着性フィルムの厚さ残存率(%)=(厚さB-100)/厚さA×100
熱硬化性のエポキシ樹脂内に金属端子用接着性フィルムを包埋し硬化させた。市販品の回転式ミクロトーム(LEICA製 UC6)と、ダイヤモンドナイフを用いて目的とする方向の断面(TDに沿った断面)を作製し、その際、液体窒素を用いたクライオミクロトームにて、-70℃にて断面作製を行った。包埋樹脂ごと四酸化ルテニウムにて一晩染色した。染色すると、ポリプロピレンが膨張するため、膨張部分をミクロトームでトリミングし、100nmほどの厚みでさらに1から2μmほど切断した部分を次のようにして観察した。染色した断面について、電界放出形走査型電子顕微鏡(例えば、日立ハイテクノロジーズ社製 S-4800 TYPE1,測定条件:3kV 20mA High WD6mm 検出器(Upper))で観測して画像(倍率は10000倍)を取得した。次に、画像を二値化できる画像処理ソフト(例えば、三谷商事製画像解析ソフトWinROOF(Ver7.4)を用い、当該画像について、海島構造の島の部分と海の部分とを二値化して、島の部分の占める面積の割合(島の部分の合計面積/画像の測定範囲の面積)を求めた。具体的な画像処理の条件は、以下の通りである。なお、本測定では、島部分が海部分よりも染色されたため、島部分が海部分よりも明るく観察された。
[画像処理条件]
3x3pix 平均化
二値化:自動二値化
孤立点除去:1画素から成り立っている物体または背景を除去する。
削除:形状特徴値、または、濃度特徴値を求めて粒子を削除(0.005μm2の面積をノイズとして認識)
(実施例1)
ポリプロピレン層として、ランダムポリプロピレン層(6μm)/ブロックポリプロピレン層(38μm)/ランダムポリプロピレン層(6μm)が順に積層されている3層構成の未延伸ポリプロピレンフィルム(CPP,合計厚さ50μm、融解ピーク温度155℃)を用意した。次に、未延伸ポリプロピレンフィルムの両面に、それぞれ、無水マレイン酸変性ポリプロピレンを押出しラミネート法により積層して、酸変性ポリプロピレン層(25μm)/ポリプロピレン層(50μm)/酸変性ポリプロピレン層(25μm)が順に積層された金属端子用接着性フィルムを製造した。得られた金属端子用接着性フィルムについて、熱収縮率を測定したところ、83.0%と高い値を示した。
ポリプロピレン層として、ランダムポリプロピレン層(8μm)/ブロックポリプロピレン層(44μm)/ランダムポリプロピレン層(8μm)が順に積層されている3層構成の未延伸ポリプロピレンフィルム(CPP,合計厚さ60μm、融解ピーク温度155℃)を用意した。次に、未延伸ポリプロピレンフィルムの両面に、それぞれ、無水マレイン酸変性ポリプロピレンを押出しラミネート法により積層して、酸変性ポリプロピレン層(20μm)/ポリプロピレン層(60μm)/酸変性ポリプロピレン層(20μm)が順に積層された金属端子用接着性フィルムを製造した。得られた金属端子用接着性フィルムについて、熱収縮率を測定したところ、81.3%と高い値を示した。
ポリプロピレン層として、ランダムポリプロピレン層(6μm)/ブロックポリプロピレン層(38μm)/ランダムポリプロピレン層(6μm)が順に積層されている3層構成の未延伸ポリプロピレンフィルム(CPP,合計厚さ50μm、融解ピーク温度155℃)を用意した。次に、未延伸ポリプロピレンフィルムの片面に、無水マレイン酸変性ポリプロピレンを押出しラミネート法により積層して、酸変性ポリプロピレン層(16μm)/ポリプロピレン層(50μm)が積層された金属端子用接着性フィルムを製造した。得られた金属端子用接着性フィルムについて、熱収縮率を測定したところ、80.1%と高い値を示した。
ポリプロピレン層として、ランダムポリプロピレン層(4μm)/ブロックポリプロピレン層(22μm)/ランダムポリプロピレン層(4μm)が順に積層されている3層構成の未延伸ポリプロピレンフィルム(CPP,合計厚さ30μm、融解ピーク温度155℃)を用意した。次に、未延伸ポリプロピレンフィルムの片面に、無水マレイン酸変性ポリプロピレンを押出しラミネート法により積層して、酸変性ポリプロピレン層(36μm)/ポリプロピレン層(30μm)が積層された金属端子用接着性フィルムを製造した。得られた金属端子用接着性フィルムについて、熱収縮率を測定したところ、88.1%と高い値を示した。
ポリプロピレン層として、ランダムポリプロピレン層(4μm)/ブロックポリプロピレン層(22μm)/ランダムポリプロピレン層(4μm)が順に積層されている3層構成の未延伸ポリプロピレンフィルム(CPP,合計厚さ30μm、融解ピーク温度155℃)を用意した。次に、未延伸ポリプロピレンフィルムの両面に、それぞれ、無水マレイン酸変性ポリプロピレンを押出しラミネート法により積層して、酸変性ポリプロピレン層(18μm)/ポリプロピレン層(30μm)/酸変性ポリプロピレン層(18μm)が順に積層された金属端子用接着性フィルムを製造した。得られた金属端子用接着性フィルムについて、熱収縮率を測定したところ、88.1%と高い値を示した。
ポリプロピレン層として、ブロックポリプロピレン層(60μm)の未延伸ポリプロピレンフィルム(CPP,合計厚さ60μm、融解ピーク温度159℃)を用意した。次に、未延伸ポリプロピレンフィルムの両面に、それぞれ、無水マレイン酸変性ポリプロピレンを押出しラミネート法により積層して、酸変性ポリプロピレン層(20μm)/ポリプロピレン層(60μm)/酸変性ポリプロピレン層(20μm)が順に積層された金属端子用接着性フィルムを製造した。得られた金属端子用接着性フィルムについて、熱収縮率を測定したところ、81.7%と高い値を示した。
ポリプロピレン層として、ランダムポリプロピレン層(4μm)/ブロックポリプロピレン層(22μm)/ランダムポリプロピレン層(4μm)が順に積層されている3層構成の未延伸ポリプロピレンフィルム(CPP,合計厚さ30μm、融解ピーク温度155℃)を用意した。次に、未延伸ポリプロピレンフィルムの両面に、無水マレイン酸変性ポリプロピレンを押出しラミネート法により積層して、酸変性ポリプロピレン層(16μm)/ポリプロピレン層(30μm)/酸変性ポリプロピレン(16μm)が積層された金属端子用接着性フィルムを製造した。得られた金属端子用接着性フィルムについて、熱収縮率を測定したところ、88.7%と高い値を示した。
ポリプロピレン層として、ランダムポリプロピレン層(4μm)/ブロックポリプロピレン層(22μm)/ランダムポリプロピレン層(4μm)が順に積層されている3層構成の未延伸ポリプロピレンフィルム(CPP,合計厚さ30μm、融解ピーク温度155℃)を用意した。次に、未延伸ポリプロピレンフィルムの両面に、それぞれ、無水マレイン酸変性ポリプロピレンを押出しラミネート法により積層して、酸変性ポリプロピレン層(35μm)/ポリプロピレン層(30μm)/酸変性ポリプロピレン層(35μm)が順に積層された金属端子用接着性フィルムを製造した。
ポリプロピレン層として、ランダムポリプロピレン層(3μm)/ブロックポリプロピレン層(3μm)/ランダムポリプロピレン層(19μm)が順に積層されている3層構成の未延伸ポリプロピレンフィルム(CPP,合計厚さ25μm、融解ピーク温度155℃)を用意した。次に、未延伸ポリプロピレンフィルムの片面に、無水マレイン酸変性ポリプロピレンを押出しラミネート法により積層して、酸変性ポリプロピレン層(41μm)/ポリプロピレン層(25μm)が積層された金属端子用接着性フィルムを製造した。
ポリプロピレン層として、延伸ポリプロピレンフィルム(OPP,ホモポリプロピレン、厚さ50μm、融解ピーク温度165℃)を用意した。次に、延伸ポリプロピレンフィルムの両面に、それぞれ、無水マレイン酸変性ポリプロピレンを押出しラミネート法により積層して、酸変性ポリプロピレン層(25μm)/ポリプロピレン層(50μm)/酸変性ポリプロピレン層(25μm)が順に積層された金属端子用接着性フィルムを製造した。
フェノール樹脂、フッ化クロム(三価)化合物、リン酸の3成分からなる化成処理液で両面を化成処理(リン酸クロメート処理)したアルミニウム箔(厚み40μm)を用意した。次に、このアルミニウム箔の一方の面と、二軸延伸ナイロンフィルム(厚み25μm)とをウレタン系接着剤を介して積層した。次に、アルミニウム箔の他方の面と、未延伸ポリプロピレンフィルム(厚み30μm)とを酸変性ポリプロピレン樹脂(厚み15μm、不飽和カルボン酸でグラフト変性したポリプロピレン)でサンドイッチラミネートすると共に、熱風により酸変性ポリプロピレン樹脂の軟化点以上の温度に加熱して、二軸延伸ナイロンフィルム(25μm)/アルミニウム箔(厚み40μm)/酸変性ポリプロピレン樹脂(厚み15μm)/未延伸ポリプロピレンフィルム(15μm)が順に積層された包装材料を製造した。得られた包装材料を用いて、前述のシール強度の測定を行った。
2 金属端子
3 包装材料
3a 包装材料の周縁部
4 電池素子
10 電池
11 ポリプロピレン層
12 酸変性ポリプロピレン層
31 基材層
32 接着剤層
33 バリア層
34 熱融着性樹脂層
35 接着層
P 中心
S ヒートシールされた部分
Claims (10)
- 電池素子の電極に電気的に接続された金属端子と、前記電池素子を封止する包装材料との間に介在される、金属端子用接着性フィルムであって、
前記金属端子用接着性フィルムは、少なくとも1層のポリプロピレン層と、少なくとも1層の酸変性ポリプロピレン層とを備える積層体から構成されており、
前記酸変性ポリプロピレン層が、前記金属端子用接着性フィルムの少なくとも片面側の表層を構成しており、
前記ポリプロピレン層は、断面を電子顕微鏡写真で観察した際に海島構造が観察され、
前記酸変性ポリプロピレン層の合計厚さを1とした場合に、前記ポリプロピレン層の合計厚さが、0.7以上3.5以下の範囲内にある、金属端子用接着性フィルム。 - 前記ポリプロピレン層は、ブロックポリプロピレンを含んでいる、請求項1に記載の金属端子用接着性フィルム。
- 前記ポリプロピレン層は、未延伸ポリプロピレンにより構成されている、請求項1または2に記載の金属端子用接着性フィルム。
- 前記ポリプロピレン層は、ランダムポリプロピレンにより構成された層と、ブロックポリプロピレンにより構成された層と、ランダムポリプロピレンにより構成された層とがこの順に積層された積層構成を有している、請求項1~3のいずれかに記載の金属端子用接着性フィルム。
- 前記金属端子用接着性フィルムを示差走査熱量計で測定した場合に、150℃以上165℃以下の範囲に融解ピークが観察される、請求項1~4のいずれかに記載の金属端子用接着性フィルム。
- 以下の測定方法で測定される、前記金属端子用接着性フィルムの厚さ残存率が、50%以上である、請求項1~5のいずれかに記載の金属端子用接着性フィルム。
厚さ100μmのアルミニウム板と、前記金属端子用接着性フィルムを用意する。
前記金属端子用接着性フィルムの厚さA(μm)を測定する。
前記アルミニウム板及び前記金属端子用接着性フィルムの長さ方向及び幅方向が一致するようにして、前記アルミニウム板の中心部分に前記金属端子用接着性フィルムを重ねる。
前記アルミニウム板の長さより長く、幅7mmの金属板を2枚用意し、前記金属端子用接着性フィルムの全面を覆うようにして、前記アルミニウム板と前記金属端子用接着性フィルムの上下から、温度190℃、面圧1.27MPa、時間3秒間の条件で、前記金属板で加熱及び加圧を行い、前記アルミニウム板と前記金属端子用接着性フィルムの積層体を得る。
当該積層体の加熱及び加圧が行われた部分の厚さB(μm)を測定する。
以下の式によって、前記金属端子用接着性フィルムの厚さ残存率を算出する。
金属端子用接着性フィルムの厚さ残存率(%)=(厚さB-100)/厚さA×100 - 前記金属端子用接着性フィルムの流れ方向の熱収縮率が、70~90%である、請求項1~6のいずれかに記載の金属端子用接着性フィルム。
- 前記包装材料が、少なくとも、基材層、バリア層、及び熱融着性樹脂層をこの順に備える積層体から構成されており、
前記熱融着性樹脂層と前記金属端子との間に前記金属端子用接着性フィルムが介在される、請求項1~7のいずれかに記載の金属端子用接着性フィルム。 - 少なくとも、正極、負極、及び電解質を備えた電池素子と、当該電池素子を封止する包装材料と、前記正極及び前記負極のそれぞれに電気的に接続され、前記包装材料の外側に突出した金属端子とを備える電池であって、
前記金属端子と前記包装材料との間に、請求項1~8のいずれかに記載の金属端子用接着性フィルムが介在されてなる、電池。 - 少なくとも1層のポリプロピレン層と、少なくとも1層の酸変性ポリプロピレン層とを備える積層体の使用であって、
前記酸変性ポリプロピレン層が、前記金属端子用接着性フィルムの少なくとも片面側の表層を構成しており、
前記ポリプロピレン層は、断面を電子顕微鏡写真で観察した際に海島構造が観察され、
前記酸変性ポリプロピレン層の合計厚さを1とした場合に、前記ポリプロピレン層の合計厚さが、0.7以上3.5以下の範囲内にあり、
電池素子の電極に電気的に接続された金属端子と、前記電池素子を封止する包装材料との間に介在される、金属端子用接着性フィルムとしての前記積層体の使用。
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JP2019003950A (ja) | 2019-01-10 |
JP2022095833A (ja) | 2022-06-28 |
CN110808342B (zh) | 2022-09-30 |
CN108886117A (zh) | 2018-11-23 |
JPWO2018110702A1 (ja) | 2018-12-20 |
CN108886117B (zh) | 2019-11-26 |
KR102631758B1 (ko) | 2024-02-01 |
JP6402844B1 (ja) | 2018-10-10 |
CN110808342A (zh) | 2020-02-18 |
KR20190089930A (ko) | 2019-07-31 |
JP7056483B2 (ja) | 2022-04-19 |
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