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KR-20260062997-A - POWER STORAGE DEVICE PACKAGING MATERIAL AND POWER STORAGE DEVICE INCLUDING THE SAME

KR20260062997AKR 20260062997 AKR20260062997 AKR 20260062997AKR-20260062997-A

Abstract

An exterior material for a storage device related to one aspect of the present disclosure comprises at least a substrate layer, an outer adhesive layer, a barrier layer, and a sealant layer in this order, wherein the difference between the coefficient of linear expansion of the substrate layer at 20 to 150°C and the coefficient of linear expansion of the barrier layer at 20 to 150°C is 20 × 10⁻⁶ /°C or less in both the MD direction and the TD direction.

Inventors

  • 무라키 다쿠야

Assignees

  • 도판 홀딩스 가부시키가이샤

Dates

Publication Date
20260507
Application Date
20210129
Priority Date
20200207

Claims (14)

  1. An exterior material for a capacitor having at least a substrate layer, an outer adhesive layer, a barrier layer, and a sealant layer in this order, An outer material for a capacitor, wherein the above-mentioned substrate layer has a single-layer structure, a sample with a length of 20 mm and a width of 10 mm is manufactured from the above-mentioned substrate layer, and when a creep test is performed in which a constant weight of 5 N is continuously applied to the sample for 3 hours under an environment of 150 ℃, both the elongation in the MD direction and the elongation in the TD direction are 3 mm or less.
  2. In Article 1, An exterior material for a capacitor, wherein the difference between the elongation amount in the MD direction and the elongation amount in the TD direction is 2 mm or less.
  3. An exterior material for a capacitor having a structure in which at least a substrate layer, an outer adhesive layer, a barrier layer, and a sealant layer are laminated in this order, An outer material for a capacitor, wherein the ratio of the volume resistivity in a 23°C environment to the volume resistivity in a 150°C environment (volume resistivity in a 23°C environment / volume resistivity in a 150°C environment) of the above substrate layer is 1 × 10⁰ to 1 × 10³ .
  4. In Paragraph 3, An outer casing for a capacitor, wherein the volume resistivity of the above-mentioned substrate layer under a 23°C environment is 1 × 10¹³ Ω·m or higher.
  5. In Paragraph 3, An outer material for a capacitor, wherein the volume resistivity of the above-mentioned substrate layer under a 150°C environment is 1 × 10¹² Ω·m or higher.
  6. In Paragraph 3, The thickness of the above substrate layer is 35 μm or less, and An outer casing for a capacitor, wherein the value obtained by multiplying the volume resistivity of the substrate layer in a 150°C environment by the thickness of the substrate layer is 5 × 10¹³ (Ω·m × μm) or greater.
  7. In Article 1, An exterior material for a capacitor, wherein the above barrier layer is aluminum foil.
  8. In Article 1, An exterior material for a capacitor, wherein the above-mentioned substrate layer is a biaxially stretched film.
  9. In Article 1, An outer casing for a capacitor, wherein the above-mentioned substrate layer is a semi-aromatic polyamide film.
  10. In Article 1, An outer layer for a capacitor, wherein the outer layer adhesive layer is a layer formed using a polyester-urethane-based adhesive.
  11. In Article 1, An outer casing for a capacitor, wherein the thickness of the outer adhesive layer is 1 to 10 μm.
  12. In Article 1, Exterior material for a storage device, for all-solid-state batteries.
  13. The main body of the capacitor device, and A current extraction terminal extending from the main body of the above-mentioned capacitor, and, An exterior material for a capacitor described in any one of claims 1 to 12, which clamps the current extraction terminal and also accommodates the main body of the capacitor. A capacitor device equipped with
  14. In Article 13, A storage device that is an all-solid-state battery.

Description

Packing material for a power storage device and a power storage device using the same The present disclosure relates to an exterior material for a battery storage device and a battery storage device using the same. As energy storage devices, secondary batteries such as lithium-ion batteries, nickel-hydrogen batteries, and lead-acid batteries, as well as electrochemical capacitors such as electric double-layer capacitors, are known. Due to the miniaturization of portable devices and limitations on installation space, further miniaturization of energy storage devices is required, and lithium-ion batteries with high energy density are attracting attention. Conventionally, metal cans were used as casing materials for lithium-ion batteries, but multilayer films have come into use as they are lightweight, have high heat dissipation, and can be manufactured at low cost. A lithium-ion battery using the above-mentioned multilayer film as an outer casing is referred to as a laminated lithium-ion battery. The outer casing covers the battery contents (positive electrode, separator, negative electrode, electrolyte, etc.) and prevents moisture from entering the interior. A laminated lithium-ion battery is manufactured, for example, by forming a concave portion in a part of the outer casing by cold forming, accommodating the battery contents within the concave portion, folding back the remaining part of the outer casing, and sealing the edge portion with a heat seal (see, for example, Patent Document 1). FIG. 1 is a schematic cross-sectional view of an outer casing for a capacitor device related to one embodiment of the present disclosure. FIG. 2 is a schematic cross-sectional view of an outer casing for a capacitor device related to one embodiment of the present disclosure. FIG. 3 is a perspective view of a capacitor device related to one embodiment of the present disclosure. Suitable embodiments of the present disclosure will be described in detail below with appropriate reference to the drawings. In addition, identical or substantial parts in the drawings are denoted by the same reference numerals, and redundant descriptions are omitted. Furthermore, the dimensional ratios in the drawings are not limited to the ratios depicted. [Exterior material for capacitors] FIG. 1 is a cross-sectional view schematically illustrating one embodiment of an exterior material for a capacitor device according to the present disclosure. As shown in FIG. 1, the exterior material (exterior material for a capacitor device) (10) of the present embodiment is a laminate in which a substrate layer (11), an outer layer adhesive layer (12a) formed on one side of the substrate layer (11), a barrier layer (13) formed on the opposite side of the substrate layer (11) of the outer layer adhesive layer (12a) having first and second corrosion-prevention treatment layers (14a, 14b) on both sides, an inner layer adhesive layer (12b) formed on the opposite side of the outer layer adhesive layer (12a) of the barrier layer (13), and a sealant layer (16) formed on the opposite side of the barrier layer (13) of the inner layer adhesive layer (12b) are laminated. Here, the first corrosion-prevention treatment layer (14a) is formed on the surface of the base layer (11) of the barrier layer (13), and the second corrosion-prevention treatment layer (14b) is formed on the surface of the sealant layer (16) of the barrier layer (13). In the exterior material (10), the base layer (11) is the outermost layer and the sealant layer (16) is the innermost layer. That is, the exterior material (10) is used with the base layer (11) facing the outside of the capacitor and the sealant layer (16) facing the inside of the capacitor. In the exterior material (10) related to the first aspect of the present embodiment, the difference between the linear expansion coefficient of the base layer (11) at 20 to 150°C and the linear expansion coefficient of the barrier layer (13) at 20 to 150°C is 20 × 10⁻⁶ /°C or less in both the MD direction and the TD direction. Additionally, in the present specification, the linear expansion coefficient of the barrier layer (13) may be measured for the barrier layer (13) in a state where the first and second corrosion-prevention treatment layers (14a, 14b) are not formed, or may be measured for the barrier layer (13) in a state where the first and second corrosion-prevention treatment layers (14a, 14b) are formed. Since the thickness of the first and second corrosion-resistant treatment layers (14a, 14b) is very thin compared to the thickness of the barrier layer (13), the influence of their presence on the measured value of the coefficient of linear expansion of the barrier layer (13) can be almost ignored. In the present disclosure, the coefficient of linear expansion can be measured using a thermomechanical analyzer (TMA). Specific measurement conditions are as shown in the examples. In the exterior material (10) related to the first aspect of the