KR-102964604-B1 - Exterior material for a storage device, method of manufacturing the same, and storage device

KR102964604B1KR 102964604 B1KR102964604 B1KR 102964604B1KR-102964604-B1

Abstract

A technology is provided for suppressing curling caused by molding of an exterior material for a capacitor device. The exterior material for a capacitor device is composed of a laminate having at least a substrate layer, a barrier layer, and a heat-fusible resin layer in this order, wherein the slope of the stress-strain curve corresponding to two strain points of tensile strain of 1% and 5% in the MD direction is 700 MPa or less.

Inventors

나카무라 신이치로
야마시타 다카노리

Assignees

다이니폰 인사츠 가부시키가이샤

Dates

Publication Date: 20260512
Application Date: 20190926
Priority Date: 20181001

Claims (20)

At least, it is composed of a laminate having a substrate layer, a barrier layer, and a heat-fusible resin layer in this order, and The above laminate has a slope of the stress-strain curve corresponding to two strain points of 1% tensile strain and 5% tensile strain in the MD direction of 700 MPa or less, and An outer casing for a capacitor, wherein the absolute value of the difference between the slope of the stress-strain curve corresponding to two deformation points with tensile strain of 1% and 5% in the MD direction of the laminate and the slope of the stress-strain curve corresponding to two deformation points with tensile strain of 1% and 5% in the TD direction of the laminate is 118 MPa or less.
In paragraph 1, The above laminate is an outer material for a capacitor device, wherein the slope of the stress-strain curve corresponding to two strain points of tensile strain of 1% and 5% in the TD direction is 630 MPa or less.
In paragraph 1 or 2, The above substrate layer is an outer layer for a capacitor device comprising at least one of polyester and polyamide.
In paragraph 1 or 2, An outer casing for a capacitor, wherein at least two types of lubricants are present on at least one of the surface and interior of the above-mentioned substrate layer.
In paragraph 1 or 2, An outer casing for a capacitor device, wherein at least two types selected from the group consisting of saturated fatty acid amide, unsaturated fatty acid amide, substituted amide, methylolamide, saturated fatty acid bisamide, unsaturated fatty acid bisamide, fatty acid esteramide, and aromatic bisamide are present on at least one of the surface and interior of the above-mentioned substrate layer.
In paragraph 1 or 2, A lubricant is present on the surface of the above substrate layer, and An outer casing for a capacitor device, wherein the amount of the above lubricant is 3 mg/ m² or more.
In paragraph 1 or 2, The thickness of the above substrate layer is 50 μm or less, The thickness of the above substrate layer is 35 μm or less, or Or, an outer casing for a storage device having a thickness of the substrate layer greater than 35 μm and less than or equal to 50 μm.
In paragraph 1 or 2, The above barrier layer comprises at least one of an aluminum alloy foil and a stainless steel foil, an outer material for a capacitor device.
In paragraph 1 or 2, The thickness of the above barrier layer is 200 μm or less, The thickness of the above barrier layer is 50 μm or less, or Or, an outer casing for a storage device having a barrier layer thickness of more than 50 μm and less than or equal to 200 μm.
In paragraph 1 or 2, The above-mentioned heat-fusible resin layer is an outer casing for a capacitor device, composed of a resin containing a polyolefin framework.
In paragraph 1 or 2, The above-mentioned heat-fusible resin layer comprises at least one selected from the group consisting of polyolefin, cyclic polyolefin, acid-modified polyolefin, and acid-modified cyclic polyolefin, an outer casing for a storage device.
In paragraph 1 or 2, The above-mentioned heat-fusible resin layer is formed by a blending polymer comprising two or more types of resins, and is an outer material for a capacitor device.
In paragraph 1 or 2, The above-mentioned heat-fusible resin layer is formed in two or more layers by the same or different resins, an outer material for a capacitor device.
In paragraph 1 or 2, An outer casing for a capacitor device, wherein at least two types of lubricants are present on at least one of the surface and the interior of the heat-fusible resin layer.
In paragraph 1 or 2, An outer casing for a capacitor device, wherein at least two types selected from the group consisting of saturated fatty acid amide, unsaturated fatty acid amide, substituted amide, methylolamide, saturated fatty acid bisamide, unsaturated fatty acid bisamide, fatty acid esteramide, and aromatic bisamide are present on at least one of the surface and interior of the heat-fusible resin layer.
In paragraph 1 or 2, An adhesive layer is provided between the above barrier layer and the above heat-fusible resin layer, and An outer casing for a capacitor device, wherein the thickness of the adhesive layer is 10 μm or less.
In paragraph 1 or 2, The above substrate layer is an outer layer for a capacitor device, composed of a single layer of polyamide film.
In paragraph 1 or 2, An outer casing for a capacitor device, further comprising a surface coating layer on the side opposite to the heat-fusible resin layer of the above-mentioned substrate layer.
In Paragraph 18, An outer material for a capacitor device, wherein a lubricant is present on at least one of the surface and the interior of the above-mentioned surface coating layer.
In Paragraph 18, An outer material for a capacitor device, wherein at least two types selected from the group consisting of saturated fatty acid amide, unsaturated fatty acid amide, substituted amide, methylolamide, saturated fatty acid bisamide, unsaturated fatty acid bisamide, fatty acid esteramide, and aromatic bisamide are present on at least one of the surface and interior of the above-mentioned surface coating layer.

Description

Exterior material for a storage device, method of manufacturing the same, and storage device The present disclosure relates to an outer casing for a storage device, a method for manufacturing the same, and a storage device. Conventionally, although various types of capacitor devices have been developed, packaging materials (outer casings) are indispensable components for encapsulating capacitor device elements such as electrodes and electrolytes in all capacitor devices. Conventionally, metal outer casings have been widely used as outer casings for capacitor devices. Meanwhile, with the recent increase in performance of electric vehicles, hybrid electric vehicles, PCs, cameras, and mobile phones, various shapes are required for energy storage devices, as well as thinning and weight reduction. However, conventional metal casings for energy storage devices have the drawback of being difficult to keep up with the diversification of shapes and having limitations in terms of weight reduction. Accordingly, a film-type exterior material has recently been proposed as an exterior material for a capacitor device that is easy to process into various shapes and can achieve thinning or weight reduction, wherein the substrate, aluminum alloy thin layer, and heat-fusible resin layer are sequentially laminated (for example, see Patent Document 1). In such a film-type exterior material, a concave portion is generally formed by cold forming, an energy storage device element such as an electrode or an electrolyte is placed in the space formed by the concave portion, and by heat-fusing the heat-fusible resin layers together, an energy storage device having an energy storage device element housed inside the exterior material is obtained. FIG. 1 is a schematic diagram showing an example of a cross-sectional structure of an outer casing for a capacitor device according to the present disclosure. FIG. 2 is a schematic diagram showing an example of a cross-sectional structure of an outer casing for a capacitor device according to the present disclosure. FIG. 3 is a schematic diagram showing an example of a cross-sectional structure of an outer casing for a capacitor device according to the present disclosure. FIG. 4 is a schematic diagram showing an example of a cross-sectional structure of an outer casing for a capacitor device according to the present disclosure. Figure 5 is a schematic diagram illustrating a method for evaluating curl by molding an outer material for a capacitor device. Figure 6 is a schematic diagram illustrating a method for evaluating curl by molding an outer casing for a capacitor device. FIG. 7 is a schematic plan view of a packaging formed by an outer casing for a capacitor device of the present disclosure. Figure 8 is a schematic cross-sectional view along line A-A' of Figure 7. FIG. 9 is a schematic plan view of a packaging formed by an outer casing for a capacitor device of the present disclosure. The outer casing for a capacitor device of the present disclosure is composed of a laminate having at least a substrate layer, a barrier layer, and a heat-fusible resin layer in that order, and the laminate is characterized in that the slope of the stress-strain curve corresponding to two strain points of tensile strain of 1% and tensile strain of 5% in the MD direction is 700 MPa or less. According to the outer casing for a capacitor device of the present disclosure, by having the above configuration, curling caused by molding of the outer casing for a capacitor device can be preferably suppressed. Hereinafter, the outer casing for a capacitor device of the present disclosure is described in detail. In addition, in this specification, numerical ranges indicated by “∼” mean “greater than or equal to” or “less than or equal to”. For example, the notation 2 to 15 mm means 2 mm or more and 15 mm or less. 1. Laminated Structure and Material Properties of Exterior Materials for Energy Storage Devices The outer casing (10) for a capacitor device of the present disclosure is composed of a laminate having, for example, a substrate layer (1), a barrier layer (3), and a heat-fusible resin layer (4) in this order, as shown in FIGS. 1 to 4. In the outer casing (10) for a capacitor device, the substrate layer (1) is the outermost layer, and the heat-fusible resin layer (4) is the innermost layer. When assembling a capacitor device using the outer casing (10) for a capacitor device and a capacitor device element, the capacitor device element is accommodated in a space formed by heat-fusing the periphery portions with the heat-fusible resin layers (4) of the outer casing (10) for a capacitor device facing each other. The outer casing (10) for the capacitor device may, for example, have an adhesive layer (2) between the base layer (1) and the barrier layer (3) as needed for the purpose of increasing the adhesion between these layers, as shown in FIGS. 2 to 4. In addition, as shown in FIGS. 3 and 4, it may, for example, have a