CN116345027A - Outer packaging material for power storage device and power storage device - Google Patents
Outer packaging material for power storage device and power storage device Download PDFInfo
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- CN116345027A CN116345027A CN202310433594.4A CN202310433594A CN116345027A CN 116345027 A CN116345027 A CN 116345027A CN 202310433594 A CN202310433594 A CN 202310433594A CN 116345027 A CN116345027 A CN 116345027A
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Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
- H01M50/126—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers
- H01M50/129—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers with two or more layers of only organic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- 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
- B32B15/043—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 metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- 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
- B32B15/08—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
- B32B15/088—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 polyamides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- 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
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/117—Inorganic material
- H01M50/119—Metals
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/121—Organic material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01M50/14—Primary casings; Jackets or wrappings for protecting against damage caused by external factors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Laminated Bodies (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
- Battery Mounting, Suspending (AREA)
- Secondary Cells (AREA)
Abstract
The present invention relates to an exterior material for an electric storage device and an electric storage device. The structure is as follows: the outer packaging material comprises a polyamide resin layer (2) as an outer layer, a heat-weldable resin layer (3) as an inner layer and a metal foil layer (4) arranged between the two layers, wherein in a melting heat distribution curve obtained by differential scanning calorimetric measurement of the polyamide resin, when the whole peak area surrounded by a peak curve and a base line is defined as X, and the peak area in the range of 210-220 ℃ is defined as Y, the relation of 0-Y/X-0.30 is satisfied. With this configuration, the polyamide resin of the outer layer of the outer package can be prevented from adhering to the seal bar during heat sealing, and the outer package for the power storage device can be provided with improved productivity.
Description
The present application is a divisional application of chinese patent application No.201811045725.7, entitled "outer packaging material for electric storage device and electric storage device", having a filing date of 2018, 9, 7.
Technical Field
The present invention relates to an exterior material for a battery or a capacitor (capacitor) used in a portable device such as a smart phone or a tablet pc, a battery or a capacitor used in a hybrid car, an electric car, wind power generation, solar power generation, or night power storage, and a power storage device exterior-packed with the exterior material.
In the present specification and claims, the term "heat of fusion profile" refers to a heat of fusion profile measured by a heat flux type DSC (differential scanning calorimeter) with a first run temperature (first run), and with a heat flow temperature (heat flow) as an ordinate.
Background
Lithium ion secondary batteries are widely used as power sources for, for example, notebook computers, video cameras, mobile phones, and the like. As this lithium ion secondary battery, a battery having a structure in which the periphery of a battery main body (main body including a positive electrode, a negative electrode, and an electrolyte) is surrounded by an outer coating material is used. As such an outer packaging material, for example, an outer packaging material having a structure in which an outermost layer formed of a stretched polyamide resin, a barrier layer formed of aluminum foil or the like, and an innermost layer formed of a heat-fusible resin are laminated in this order is known (see patent document 1).
The battery is constituted as follows: the battery body is sandwiched between a pair of outer packaging materials, and the peripheral edge portions of the inner layers of the pair of outer packaging materials are heat-sealed (heat-sealed) to each other, thereby sealing the battery body. By sufficiently sealing with such heat seal bonding, leakage of the electrolyte can be prevented.
Patent document 1: japanese patent laid-open No. 2001-93482 ( claims 1, 3, etc.)
Disclosure of Invention
Problems to be solved by the invention
However, the polyamide resin constituting the outermost layer of the outer packaging material having the above-described structure has an advantage that the molding depth can be made deeper and the puncture resistance is excellent when deep drawing molding is performed, but on the other hand, there is a problem as follows: since the melting point is low and the melting point is high, when heat sealing is performed at a high temperature of 200 ℃ or higher, poor sealing such as adhesion of the polyamide resin layer (outermost layer) to the sealing rod occurs, and productivity is deteriorated.
In order to prevent such a defective sealing, a structure in which a polyester resin layer is further laminated on the outer surface of a polyamide resin layer has been studied, but there are problems in that the cost increases and the moldability decreases.
In addition, although the surface of the seal bar is coated with a fluororesin to prevent adhesion to the seal bar, the following problems are caused by the fluororesin coating: the thermal conductivity decreases, the cycle time of the heat sealing process increases, and it becomes necessary to set the heat sealing temperature to a higher temperature.
The present invention has been made in view of the above-described technical background, and an object of the present invention is to provide an exterior material for an electrical storage device, which can prevent a polyamide resin of an outer layer of the exterior material from adhering to a seal rod during heat sealing and can improve productivity, and an electrical storage device exterior-packed with the exterior material.
Means for solving the problems
In order to achieve the above object, the present invention provides the following means.
[1] An exterior material for an electric storage device, comprising a polyamide resin layer as an outer layer, a heat-fusible resin layer as an inner layer, and a metal foil layer disposed between the two layers,
in the polyamide resin, in the melting heat distribution curve obtained by differential scanning calorimetry, when the entire area surrounded by the melting heat distribution curve and the base line is "X", and the area between the melting heat distribution curve and the base line in the range of 210 ℃ to 220 ℃ is "Y", the relational expression of 0.ltoreq.Y/X.ltoreq.0.30 is satisfied.
[2] The exterior material for a power storage device according to item 1, wherein, in the polyamide resin, when the area of the entire area surrounded by the melting heat distribution curve and the base line is "X" and the area between the melting heat distribution curve and the base line in the range of 210 to 215 ℃ is "W", the relationship of 0.ltoreq.W/X.ltoreq.0.10 is satisfied.
[3] An electricity storage device is characterized by comprising:
a power storage device main body portion; and
an outer packaging member comprising the outer packaging material for an electrical storage device according to any one of the preceding items 1 or 2,
wherein the power storage device main body is externally covered with the outer cover member.
ADVANTAGEOUS EFFECTS OF INVENTION
In the invention of [1], since the polyamide resin satisfying the relational expression of 0.ltoreq.Y/X.ltoreq.0.30 is used as the outer layer, the polyamide resin of the outer layer of the outer package can be suppressed from adhering to the seal bar at the time of heat-sealing the outer package, and productivity can be improved.
In the invention of [2], since the polyamide resin satisfying the relational expression of 0.ltoreq.W/X.ltoreq.0.10 is used as the outer layer, the polyamide resin of the outer layer of the outer material can be further suppressed from adhering to the seal bar at the time of heat-sealing the outer material, and productivity can be further improved.
In the invention of item [3], since the exterior is covered with the exterior material containing the exterior material for the power storage device having the above-described structure, the power storage device having excellent productivity is provided.
Drawings
Fig. 1 is a cross-sectional view showing an embodiment of an exterior material for an electric storage device according to the present invention.
Fig. 2 is a cross-sectional view showing an embodiment of the power storage device according to the present invention.
Fig. 3 is a perspective view showing an outer package material (planar shape), a power storage device main body portion, and an outer package case (molded body molded into a three-dimensional shape) constituting the power storage device of fig. 2 in a separated state before heat sealing.
Fig. 4 is a graph showing a melting heat distribution curve measured by first heating nylon B used in example 2 using a heat flux type DSC. From this heat of fusion profile, nylon B had a (Y/X) value of 0.19.
Fig. 5 is a graph showing a melting heat distribution curve measured by first heating nylon D used in comparative example 1 using a heat flux type DSC. From this heat of fusion profile, nylon D had a (Y/X) value of 0.43.
Description of the reference numerals
1 … outer packing material for electric storage device
2 … Polyamide resin layer (outer layer)
3 … Heat-fusible resin layer (inner layer)
4 … Metal foil layer
10 … outer packing shell
15 … outer packing member
30 … electric storage device
31 … Main body of Power storage device
Detailed Description
Fig. 1 shows an embodiment of an outer casing 1 for an electric storage device according to the present invention. The exterior material 1 for power storage devices is used as a lithium ion secondary battery case.
The outer packaging material 1 for the power storage device comprises the following components: a polyamide resin layer (outer layer) 2 is laminated and integrated on one surface of a metal foil layer 4 via a first adhesive layer 5, and a heat-fusible resin layer (inner layer) 3 is laminated and integrated on the other surface of the metal foil layer 4 via a second adhesive layer 6.
In the outer packaging material 1 for an electric storage device according to the present invention, the polyamide resin layer (outer layer) 2 is made of the following polyamide resin: in the polyamide resin, in a melting heat distribution curve obtained by differential scanning calorimetry, when an entire area surrounded by the melting heat distribution curve and a base line is defined as "X", and an area between the melting heat distribution curve and the base line in a range of 210 ℃ to 220 ℃ is defined as "Y", a relational expression of 0.ltoreq.Y/X.ltoreq.0.30 is satisfied. As described above, by using the polyamide resin satisfying the relational expression of 0.ltoreq.y/x.ltoreq.0.30 as the outer layer 2, the polyamide resin of the outer layer 2 of the outer package material can be suppressed from adhering to the seal bar at the time of heat-sealing the outer package material 1, and productivity can be improved.
The polyamide resin layer (outer layer) 2 is preferably composed of the following polyamide resin: in the polyamide resin, in a melting heat distribution curve obtained by differential scanning calorimetry, when an entire area surrounded by the melting heat distribution curve and a base line is defined as "X", and an area between the melting heat distribution curve and the base line in a range of 210 ℃ to 215 ℃ is defined as "W", a relational expression of 0.ltoreq.W/X.ltoreq.0.10 is satisfied. In this case, the polyamide resin of the outer layer 2 of the outer material can be further prevented from adhering to the seal bar at the time of heat sealing of the outer material, and productivity can be further improved.
The polyamide resin constituting the polyamide resin layer 2 may be any polyamide resin that satisfies the relational expression of "0.ltoreq.Y/X.ltoreq.0.30", and examples thereof include nylon 6 films, nylon 6,6 films, nylon MXD films, and the like that satisfy the relational expression. The polyamide resin layer 2 may be formed as a single layer or as a plurality of layers.
The thickness of the polyamide resin layer 2 is preferably 8 μm to 50 μm. By setting the lower limit value to be equal to or higher than the above-described preferable lower limit value, sufficient strength as an outer package material can be ensured, and by setting the upper limit value to be equal to or lower than the above-described preferable upper limit value, stress at the time of molding such as bulge molding, drawing molding, and the like can be reduced, and moldability can be improved. Among them, the thickness of the polyamide resin layer 2 is particularly preferably 12 μm to 25 μm.
The heat-fusible resin layer (inner layer) 3 has excellent chemical resistance against an electrolyte solution or the like having high corrosiveness used in a lithium ion secondary battery or the like, and also has a function of imparting heat sealability to an outer packaging material.
The heat-fusible resin layer 3 is not particularly limited, but is preferably a heat-fusible resin unstretched film layer. The heat-fusible resin layer unstretched film layer 3 is not particularly limited, and is preferably formed of an unstretched film formed of at least one heat-fusible resin selected from the group consisting of polyethylene, polypropylene, olefin copolymer, acid-modified products thereof, and ionomer. The heat-fusible resin layer 3 may be a single layer or a plurality of layers.
The thickness of the heat-fusible resin layer 3 is preferably 10 μm to 80 μm. By setting the thickness to 10 μm or more, pinholes can be sufficiently prevented, and by setting the thickness to 80 μm or less, the resin usage amount can be reduced, and cost reduction can be achieved. Among them, the thickness of the heat-fusible resin layer 3 is particularly preferably set to 25 μm to 50 μm.
The heat-fusible resin layer 3 may contain a lubricant. The lubricant is not particularly limited, and a fatty acid amide may be preferably used. The fatty acid amide is not particularly limited, and examples thereof include saturated fatty acid amides, unsaturated fatty acid amides, substituted amides, methylolamides, saturated fatty acid bisamides, unsaturated fatty acid bisamides, fatty acid ester amides, and aromatic bisamides.
The metal foil layer 4 plays a role of imparting gas barrier properties (preventing invasion of oxygen and moisture) to the outer packaging material 1. The metal foil layer 4 is not particularly limited, and examples thereof include aluminum foil, SUS foil (stainless steel foil), copper foil, and the like, and aluminum foil is generally used. The thickness of the metal foil layer 4 is preferably 5 μm to 50 μm. By having a thickness of 5 μm or more, pinholes can be prevented from being formed during rolling in the production of a metal foil, and by having a thickness of 50 μm or less, stress during molding such as bulge molding and drawing molding can be reduced, and moldability can be improved. Among them, the thickness of the metal foil layer 4 is particularly preferably 10 μm to 40 μm.
In the metal foil layer 4, it is preferable that at least the inner surface (the surface on the second adhesive layer 6 side) is subjected to a chemical conversion treatment. By performing such chemical conversion treatment, corrosion of the metal foil surface due to the content (electrolyte of the battery or the like) can be sufficiently prevented. For example, the metal foil is subjected to a chemical conversion treatment by performing the following treatment. That is, for example, the surface of the metal foil after degreasing is coated with an aqueous solution of any one of the following 1) to 3), and then dried, whereby the chemical conversion treatment is performed.
1) Containing phosphoric acid,
Chromic acid, and
an aqueous solution of a mixture of at least one compound selected from the group consisting of a metal salt of a fluoride and a non-metal salt of a fluoride;
2) Containing phosphoric acid,
At least one resin selected from the group consisting of acrylic resin, chitosan (chitosan) derivative resin, and phenolic resin, and
aqueous solutions of mixtures of at least one compound selected from the group consisting of chromic acid and chromium (III) salts
3) Containing phosphoric acid,
At least one resin selected from the group consisting of acrylic resins, chitosan derivative resins, and phenolic resins,
At least one compound selected from the group consisting of chromic acid and chromium (III) salts, and
an aqueous solution of a mixture of at least one compound selected from the group consisting of metal salts of fluorides and nonmetallic salts of fluorides.
The amount of chromium attached to the chemical conversion coating (on each surface) is preferably 0.1mg/m 2 ～50mg/m 2 Particularly preferably 2mg/m 2 ～20mg/m 2 。
The first adhesive layer 5 is not particularly limited, and examples thereof include a polyurethane adhesive layer, a polyester polyurethane adhesive layer, a polyether polyurethane adhesive layer, and the like. The thickness of the first adhesive layer 5 is preferably set to 1 μm to 5 μm. Among them, the thickness of the first adhesive layer 5 is particularly preferably set to 1 μm to 3 μm from the viewpoint of reduction in thickness and weight of the outer package.
The second adhesive layer 6 is not particularly limited, and for example, a layer exemplified as the first adhesive layer 5 may be used, and a polyolefin adhesive having little swelling due to an electrolyte solution is preferably used. The thickness of the second adhesive layer 6 is preferably set to 1 μm to 5 μm. Among them, the thickness of the second adhesive layer 6 is particularly preferably set to 1 μm to 3 μm from the viewpoint of reduction in thickness and weight of the outer package.
By molding (deep drawing, bulging, etc.) the exterior material 1 for an electric storage device according to the present invention, an exterior case (battery case, etc.) 10 (see fig. 3) can be obtained. The outer package 1 of the present invention may be used as it is without being molded (see fig. 3).
Fig. 2 shows an embodiment of an electric storage device 30 configured using the outer package material 1 for an electric storage device according to the present invention. The power storage device 30 is a lithium ion secondary battery. As shown in fig. 2 and 3, in the present embodiment, the outer package member 15 is constituted by the outer package case 10 obtained by molding the outer package material 1 and the planar outer package material 1. Then, in the storage recess of the exterior case 10 obtained by molding the exterior material 1 of the present invention, a storage device main body portion (electrochemical element or the like) 31 having a substantially rectangular parallelepiped shape is stored, and when the exterior material 1 of the present invention is not molded, the storage device main body portion 31 is arranged so that the heat-fusible resin layer 3 side thereof is the inner side (lower side), and the peripheral edge portion of the heat-fusible resin layer 3 of the planar exterior material 1 and the heat-fusible resin layer 3 of the flange portion (sealing peripheral edge portion) 29 of the exterior case 10 are sealed by heat sealing, whereby the storage device 30 of the present invention is constituted (see fig. 2 and 3). The inner surface of the receiving recess of the exterior case 10 is a heat-fusible resin layer 3, and the outer surface of the receiving recess is a base material layer (outer layer) 2 (see fig. 3).
In fig. 2, 39 is a heat-sealed portion formed by joining (welding) a peripheral edge portion of the outer package 1 and a flange portion (sealing peripheral edge portion) 29 of the outer package case 10. In the above-described power storage device 30, the distal end portion of the tab connected to the power storage device main body 31 is led out of the outer cover member 15, but is omitted from the drawings.
The power storage device main body 31 is not particularly limited, and examples thereof include a battery main body, a capacitor main body, and a capacitor main body.
The width of the heat seal portion 39 is preferably set to 0.5mm or more. By setting the diameter to 0.5mm or more, sealing can be reliably performed. The width of the heat seal portion 39 is preferably set to 3mm to 15mm.
In the above embodiment, the outer package member 15 has a structure including the outer package case 10 obtained by molding the outer package 1 and the planar outer package 1 (see fig. 2 and 3), but is not particularly limited to such a combination, and for example, the outer package member 15 may have a structure including a pair of planar outer packages 1 or may have a structure including a pair of outer package cases 10.
Examples
Specific examples of the present invention will be described below, but the present invention is not limited to these examples.
< raw Material >
[ Nylon A ] … Nylon 6 having "Y/X" of 0.17 and "W/X" of 0.03 calculated from the melting heat distribution curve (which was obtained by DSC measurement)
Nylon 6 having "Y/X" of 0.19 and "W/X" of 0.05 calculated from the melting heat distribution curve (which was obtained by DSC) (see fig. 4) of nylon B …
[ Nylon C ] … Nylon 6 having "Y/X" of 0.28 and "W/X" of 0.11 calculated from the melting heat distribution curve (which was obtained by DSC measurement)
[ Nylon D ] … Nylon 6 having "Y/X" of 0.43 and "W/X" of 0.11 calculated from the melting heat distribution curve (which was obtained by DSC measurement) (see FIG. 5)
[ Nylon E ] … Nylon 6 having "Y/X" of 0.47 and "W/X" of 0.12 calculated from the melting heat distribution curve (which was obtained by DSC measurement)
Nylon 6 having "Y/X" of 0.47 and "W/X" of 0.15, which was calculated from the melting heat distribution curve (which was obtained by DSC measurement), was [ nylon F ] ….
Method for measuring melting Heat distribution Curve Using differential scanning calorimetric measurement (DSC)
The heat of fusion profile of the nylons A to F was measured by a heat flux DSC (differential scanning calorimeter) under a nitrogen atmosphere (nitrogen flow: 50 mL/min) with a sample amount of 1.0g to 1.5g and a heating rate of 10 ℃/min, and the heat of fusion profile at the time of the first heating (30 ℃ C. To 280 ℃ C.). Then, from the obtained heat distribution curve, the total peak area X surrounded by the peak curve and the base line is obtained, the area Y between the heat distribution curve and the base line in the range of 210 ℃ to 220 ℃ is obtained, the area W between the heat distribution curve and the base line in the range of 210 ℃ to 215 ℃ is obtained, and the values of "Y/X" and "W/X" are obtained. As the heat flux type DSC, a "Discovery DSC2500 type differential scanning calorimeter" manufactured by TA Instruments Co., ltd was used.
Example 1 >
A chemical conversion treatment solution containing phosphoric acid, polyacrylic acid (acrylic resin), a chromium (III) salt compound, water, and alcohol was applied to both sides of an aluminum foil 4 having a thickness of 35 μm, and then dried at 180 ℃. The chromium adhesion amount of the chemical conversion coating was 10mg/m per one surface 2 。
Next, a biaxially stretched nylon a film 2 having a thickness of 15 μm was dry laminated (bonded) on one surface of the aluminum foil 4 after the chemical conversion treatment via a 2-liquid curable urethane adhesive 5. Next, an unstretched polypropylene film (heat-fusible resin layer) 3 having a thickness of 30 μm was bonded to the other surface of the aluminum foil 4 via a maleic anhydride-modified polypropylene adhesive 6, and then left to stand at 40 ℃ for 5 days, whereby an outer package material 1 for an electric storage device shown in fig. 1 was obtained.
Example 2 >
An outer package 1 for an electric storage device having the structure shown in fig. 1 was obtained in the same manner as in example 1, except that nylon B was used as the polyamide resin of the outer layer instead of nylon a.
Example 3 >
An outer package 1 for an electric storage device having the structure shown in fig. 1 was obtained in the same manner as in example 1, except that nylon C was used as the polyamide resin of the outer layer instead of nylon a.
Comparative example 1 >
An outer package for a power storage device was obtained in the same manner as in example 1, except that nylon D was used as the polyamide resin of the outer layer instead of nylon a.
Comparative example 2 >
An outer package for a power storage device was obtained in the same manner as in example 1, except that nylon E was used as the polyamide resin of the outer layer instead of nylon a.
Comparative example 3 >
An outer package for a power storage device was obtained in the same manner as in example 1, except that nylon F was used as the polyamide resin of the outer layer instead of nylon a.
TABLE 1
X: the area of the whole enclosed by the melting heat distribution curve and the base line
Y: area between the heat of fusion profile and the baseline in the range of 210 ℃ to 220 DEG C
W: area between the heat of fusion profile and baseline in the range of 210 ℃ to 215 DEG C
The outer packaging material for each power storage device obtained in the above manner was evaluated by the following evaluation method. The results are shown in Table 1.
< method for evaluating adhesion prevention to sealing rod >
5 samples obtained by cutting a rectangular shape of 100mm long by 50mm wide from the obtained exterior material for the power storage device were prepared, folded inward at 2 equally divided positions in the longitudinal direction, and the peripheral edge portions of the inner layers were overlapped with each other, and heat-sealed by sandwiching them under sealing conditions of the following temperatures×0.2mpa×3 seconds by a pair of heat-sealing bars. The above temperatures are 198 deg.C, 200 deg.C, 203 deg.C, 205 deg.C and 210 deg.C. Whether or not the outer layer of the outer package material was adhered to the seal bar when the seal bar was separated was checked, and the adhesion prevention was evaluated based on the following determination criteria.
(determination criterion)
The outer layer of the "good" … … outer package was not attached at all to the sealing rod;
the outer layer of the outer package material temporarily adheres to the "Δ … …, but is separated from the seal rod by the self weight of the outer package material;
an outer layer of the "×" … … overwrap was attached to the seal bar.
As is clear from table 1, in the outer packaging materials for electric storage devices according to examples 1 to 3 of the present invention, even when heat-sealing is performed at a temperature of 205 ℃, the outer layer of the outer packaging material is not attached to the sealing rod at all, and thus, sealing failure does not occur, and the productivity of the heat-sealing process can be improved.
In contrast, in the outer packaging materials for the power storage devices of comparative examples 1 to 3, when heat sealing was performed at a temperature of 205 ℃, the outer layer of the outer packaging material adhered to the sealing rod, resulting in poor sealing (poor productivity).
Industrial applicability
The exterior material for an electric storage device according to the present invention can be used as exterior materials for various electric storage devices, and as a specific example, for example:
power storage devices such as lithium secondary batteries (lithium ion batteries, lithium polymer batteries, etc.);
lithium ion capacitor;
an electric double layer capacitance; etc.
In addition, the power storage device according to the present invention includes an all-solid-state battery in addition to the power storage device of the above example.
The present application claims priority from japanese patent application publication No. 2017-200064, filed on even date 16 at 10 in 2017, the disclosure of which forms a part of this application directly.
The terminology and description used herein is for the purpose of describing the embodiments of the invention and is not intended to be limiting. The invention is susceptible to any design modification within the scope of the claims without exceeding the gist thereof.
Claims (3)
1. An exterior material for an electric storage device, comprising a polyamide resin layer as an outer layer, a heat-fusible resin layer as an inner layer, and a metal foil layer disposed between the two layers,
wherein, in the melting heat distribution curve obtained by differential scanning calorimetric measurement, when the whole area surrounded by the melting heat distribution curve and the base line is defined as "X", and the area between the melting heat distribution curve and the base line in the range of 210 ℃ to 220 ℃ is defined as "Y", the relational expression of 0.ltoreq.Y/X.ltoreq.0.30 is satisfied.
2. The exterior material for a power storage device according to claim 1, wherein, in the polyamide resin, a relationship of 0.ltoreq.W/X.ltoreq.0.10 is satisfied when an area of an entire body surrounded by the melt heat distribution curve and a base line is defined as "X" and an area between the melt heat distribution curve and the base line in a range of 210 ℃ to 215 ℃ is defined as "W" in the melt heat distribution curve obtained by differential scanning calorimetry.
3. An electricity storage device is characterized by comprising:
a power storage device main body portion; and
an outer packaging member comprising the outer packaging material for an electrical storage device according to claim 1 or 2,
wherein the power storage device main body is externally packed with the outer packing member.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017200064A JP6979847B2 (en) | 2017-10-16 | 2017-10-16 | Exterior materials for power storage devices and power storage devices |
| JP2017-200064 | 2017-10-16 | ||
| CN201811045725.7A CN109671875B (en) | 2017-10-16 | 2018-09-07 | Outer packaging material for power storage device and power storage device |
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| CN201811045725.7A Active CN109671875B (en) | 2017-10-16 | 2018-09-07 | Outer packaging material for power storage device and power storage device |
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| KR (1) | KR102567577B1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO1999046334A1 (en) * | 1998-03-10 | 1999-09-16 | Alliedsignal Inc. | Multi-component miscible blends of nylons with improved properties |
| JP5089833B2 (en) | 1999-09-20 | 2012-12-05 | 大日本印刷株式会社 | Polymer battery packaging materials |
| JP4910229B2 (en) * | 2000-09-13 | 2012-04-04 | 株式会社Ｇｓユアサ | Film package battery |
| JP2004047246A (en) * | 2002-07-11 | 2004-02-12 | Dainippon Printing Co Ltd | Packaging material for battery |
| JP5803147B2 (en) | 2010-03-04 | 2015-11-04 | 東レ株式会社 | Battery exterior polyester film and battery exterior structure |
| JP2014069383A (en) * | 2012-09-28 | 2014-04-21 | Toray Ind Inc | Laminate |
| KR20160003694A (en) * | 2013-05-01 | 2016-01-11 | 오꾸라 고교 가부시키가이샤 | Battery packaging material |
| JP6426895B2 (en) * | 2013-05-31 | 2018-11-21 | 昭和電工パッケージング株式会社 | Battery exterior material and battery |
| JP6412388B2 (en) * | 2014-09-30 | 2018-10-24 | 昭和電工パッケージング株式会社 | Molding packaging material |
| JP6487669B2 (en) * | 2014-11-05 | 2019-03-20 | 昭和電工パッケージング株式会社 | Power storage device |
| JP6738164B2 (en) * | 2016-03-02 | 2020-08-12 | 昭和電工パッケージング株式会社 | Exterior material for power storage device and power storage device |
| JP6738171B2 (en) * | 2016-03-17 | 2020-08-12 | 昭和電工パッケージング株式会社 | Exterior material for power storage device and power storage device |
| CN106553425B (en) * | 2016-11-02 | 2018-04-13 | 广东安德力新材料有限公司 | A kind of aluminum-plastic composite membrane with good heat sealability and tearing-resistant performance |
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| TW201917927A (en) | 2019-05-01 |
| KR102567577B1 (en) | 2023-08-17 |
| KR20190042435A (en) | 2019-04-24 |
| JP2019075260A (en) | 2019-05-16 |
| JP6979847B2 (en) | 2021-12-15 |
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