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KR-102962161-B1 - TERMINAL COATING RESIN FILM AND METHOD FOR SELECTING THE SAME, POWER STORAGE DEVICE, AND POWER STORAGE DEVICE TERMINAL COATING FILM

KR102962161B1KR 102962161 B1KR102962161 B1KR 102962161B1KR-102962161-B1

Abstract

A resin film for a terminal related to one aspect of the present disclosure is disposed to cover the outer surface of a portion of a terminal in a capacitor having a capacitor body and a terminal electrically connected to the capacitor body, and has a single-layer or multi-layer structure and has a resin layer having at least one partial peak γ in the range of -130°C to -50°C of a profile of loss loss tangent tanδ obtained by measuring dynamic viscoelasticity under conditions of 1.0 Hz. A terminal film for a capacitor device related to one aspect of the present disclosure is disposed to cover the outer surface of a portion of a metal terminal electrically connected to a capacitor body constituting the capacitor device, and said terminal film is composed of a resin composition comprising a polyolefin as a first resin and at least one resin selected from polyester, polyamide, polycarbonate, and polyphenylene ether as a second resin.

Inventors

  • 이마모토 준야

Assignees

  • 도판 홀딩스 가부시키가이샤

Dates

Publication Date
20260508
Application Date
20201223
Priority Date
20191227

Claims (17)

  1. A resin film for a terminal disposed to cover the outer surface of a part of the terminal in a capacitor having a capacitor body and a terminal electrically connected to the capacitor body, The resin film for the terminal in question has a single-layer structure or a multi-layer structure, A resin film for a terminal having a resin layer having at least one partial peak γ in the range of -130 ℃ to -50 ℃ of the profile of the loss tangent tangent tanδ obtained by dynamic viscoelasticity measurement at 1.0 Hz.
  2. In Article 1, A resin film for a terminal, wherein the resin layer has at least one principal dispersion peak α in the range of 30°C to 130°C of the tanδ profile.
  3. In Article 1, A resin film for terminals in which the above resin layer contains a plasticizer.
  4. In Article 1, A resin film for terminals containing a hydrogen sulfide adsorbent.
  5. A method for selecting a resin film for a terminal arranged to cover the outer surface of a part of a terminal in a capacitor having a capacitor body and a terminal electrically connected to the capacitor body, wherein (A) A process for performing dynamic viscoelasticity measurements on a resin film for terminals subject to evaluation under conditions of 1.0 Hz, and (B) A method for selecting a resin film for a terminal, comprising a process for determining whether at least one partial peak γ exists in the range of -130 ℃ to -50 ℃ of the tanδ profile obtained by the dynamic viscoelasticity measurement above.
  6. The main body of the capacitor device, and A terminal extending from the main body of the above-mentioned capacitor, and An outer material that clamps the above terminal and also accommodates the main body of the capacitor, and A capacitor having a resin film for a terminal described in any one of claims 1 to 4, disposed between the above terminal and the above outer material.
  7. In Article 6, The above exterior material has a laminated structure comprising at least a substrate layer, a barrier layer, and a sealant layer in this order, and A capacitor device having at least one partial peak γ in the range of -130 ℃ to -50 ℃ of the profile of loss tangent tangent tanδ obtained by dynamic viscoelasticity measurement at 1.0 Hz.
  8. In Article 7, A capacitor device having the sealant layer having at least one principal dispersion peak α in the range of 30°C to 130°C of the tanδ profile.
  9. In Article 7, A capacitor device in which the sealant layer contains a plasticizer.
  10. In Article 7, A capacitor device in which the above sealant layer contains a hydrogen sulfide adsorbent.
  11. In Article 7, The adhesive layer formed between the barrier layer and the sealant layer is further provided. A capacitor device in which the adhesive layer contains a hydrogen sulfide adsorbent.
  12. In Article 7, A capacitor device further comprising a corrosion-resistant treatment layer formed on at least one surface of the barrier layer.
  13. A terminal film for a capacitor device that is arranged to cover the outer surface of a portion of a metal terminal electrically connected to a capacitor device body constituting the capacitor device, Unmodified polyolefin resin and, A second resin which is at least one resin selected from polyester, polyamide, polycarbonate, and polyphenylene ether, and A terminal film for a capacitor device characterized by having a first resin layer comprising a resin composition including a modified polyolefin resin modified to a polar group capable of reacting with the second resin.
  14. In Article 13, A terminal film for a capacitor device, characterized in that the total amount of the unmodified polyolefin resin and the modified polyolefin resin in the resin composition is 10 mass% to 80 mass% based on the total mass of the resin composition.
  15. In Article 14, A terminal film for a capacitor device characterized in that the above-mentioned modified polyolefin resin is a maleic anhydride-modified polyolefin resin.
  16. In any one of paragraphs 13 to 15, A terminal film for a capacitor device, characterized in that the degree of crystallization of the polyester or polyamide is 10% or more and less than 70% when cooled at room temperature after heat sealing under conditions of 260°C, 0.5 MPa, and 3 seconds.
  17. In any one of paragraphs 13 to 15, A terminal film for a capacitor device characterized by containing a hydrogen sulfide adsorption material.

Description

Terminal coating resin film and method for selecting the same, power storage device, and terminal film for power storage device The present disclosure relates to a resin film for a terminal disposed to cover the outer surface of a portion of a terminal in a capacitor having a capacitor body and a terminal electrically connected to the capacitor body, and a method for selecting the same. Furthermore, the present disclosure relates to a capacitor using a resin film for a terminal. Additionally, the present disclosure relates to a terminal film for a capacitor that is disposed to cover the outer surface of a portion of a metal terminal electrically connected to a capacitor body constituting the capacitor device. 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, there is a demand for further miniaturization of energy storage devices, and lithium-ion batteries, which have 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 because 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 (for example, see Patent Document 1). A laminated lithium-ion battery is provided with a current extraction terminal (sometimes called a "tab lead"). For purposes such as improving the adhesion between the current extraction terminal and the outer casing, a resin film for the terminal (sometimes called a "tab sealant") may be disposed to cover a portion of the outer periphery of the current extraction terminal (see, for example, Patent Documents 2 to 4). Figure 1 is a perspective view showing an example of an all-solid-state battery. FIG. 2 is a cross-sectional view schematically showing an example of an exterior material for a battery storage device. FIGS. 3(a) to FIGS. 3(c) are cross-sectional views schematically showing the composition of a sealant layer provided by an exterior material for a capacitor. FIG. 4 is a cross-sectional view along line IV-IV shown in FIG. 1, schematically illustrating the configuration of the tab (resin film for terminals and metal terminals) of an all-solid-state battery. FIGS. 5(a) to FIGS. 5(c) are cross-sectional views schematically illustrating examples of the composition of a resin film for terminals. FIG. 6 is a schematic plan view showing evaluation samples prepared in the examples and comparative examples. Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In addition, identical or substantial parts in the drawings are given the same reference numerals, and redundant descriptions are omitted. Also, the dimensional ratios in the drawings are not limited to the ratios depicted. <Electric storage device> FIG. 1 is a perspective view showing the schematic configuration of a storage device related to the present embodiment. In FIG. 1, an all-solid-state battery is illustrated as an example of a storage device (100), and the following description is provided. Additionally, the storage device with the configuration shown in FIG. 1 may be referred to as a battery pack or a battery cell. The storage device (100) is a solid-state battery and comprises a storage device body (50), an exterior material (10), a pair of metal terminals (30), and a resin film for terminals (also referred to as tab sealant or terminal film) (40). The storage device body (50) is a battery body that performs charging and discharging. The exterior material (10) is arranged to cover the surface of the storage device body (50) and to come into contact with a portion of the resin film for terminals (40). [Exterior materials] FIG. 2 is a cross-sectional view showing an example of a cross-sectional view of an exterior material (10). The exterior material (10) has a multilayer structure having a substrate layer (11), a first adhesive layer (12), a barrier layer (13), an anti-corrosion treatment layer (14), a second adhesive layer (17), and a sealant layer (16) in this order, extending from the outside toward the inside (side of the capacitor body (50)). (Sealant layer) The sealant layer