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JP-7856118-B2 - Energy storage device and method for manufacturing an energy storage device

JP7856118B2JP 7856118 B2JP7856118 B2JP 7856118B2JP-7856118-B2

Inventors

  • 高萩 敦子
  • 林 慎二
  • 平木 健太
  • 佐々木 美帆
  • 山崎 昌保

Assignees

  • 大日本印刷株式会社

Dates

Publication Date
20260511
Application Date
20240220
Priority Date
20210629

Claims (7)

  1. An exterior component for an energy storage device, The aforementioned energy storage device is Electrode body and The electrode body is enclosed by an outer casing, The exterior body is composed of the film-like exterior member, The outer casing includes a first sealing portion, a first surface, and a second surface, which are sealed by joining together surfaces that face each other when the outer casing member is wrapped around the electrode body. The area of the first surface is larger than the area of the second surface. The first sealing portion does not overlap with the first surface in a plan view. The exterior component is composed of a laminate comprising, at least, a base layer, a barrier layer, and a heat-fusible resin layer in this order. The barrier layer comprises an aluminum alloy foil satisfying the composition of Fe: 0.2% by mass or more and 2.0% by mass or less, and Mg: 0.1% by mass or more and 5.0% by mass or less. The aluminum alloy foil is an exterior component in which the orientation density of the Copper orientation and R orientation of the texture is 15 or less .
  2. The exterior component according to claim 1, wherein the aluminum alloy foil contains Mn: 0.10% by mass or less as an unavoidable impurity.
  3. The exterior component according to claim 1 or 2, wherein the aluminum alloy foil contains Cu: 0.10% by mass or less as an unavoidable impurity.
  4. The exterior component according to claim 1 or 2, wherein the composition of the aluminum alloy foil satisfies the condition that Mg: greater than 1.5% by mass and less than or equal to 5.0% by mass.
  5. The exterior component according to claim 1 or 2, wherein the aluminum alloy foil contains aluminum and unavoidable impurities with respect to Fe and Mg, and the content of unavoidable impurities other than Fe, Mg, and Al in the aluminum alloy foil is 0.10% by mass or less individually and 0.40% by mass or less in total.
  6. The remainder further contains Si, in addition to the unavoidable impurities . The exterior member according to claim 5, wherein the composition of the aluminum alloy foil satisfies a composition of Si: 0.5% by mass or less.
  7. The exterior member according to claim 1 or 2, wherein the aluminum alloy foil has an average crystal grain size of 25 μm or less.

Description

This invention relates to an energy storage device and a method for manufacturing an energy storage device. Japanese Patent No. 4509242 (Patent Document 1) discloses a secondary battery. In this secondary battery, the electrode body is sealed within a bag made of an outer casing material (laminated film) (see Patent Document 1). Patent No. 4509242 This is a schematic perspective view showing an energy storage device according to Embodiment 1.This is a schematic plan view illustrating an energy storage device.This is a schematic side view illustrating an energy storage device.A cross-sectional view showing an example of the layer structure of exterior components.A cross-sectional view showing an example of the layer structure of exterior components.A cross-sectional view showing an example of the layer structure of exterior components.A cross-sectional view showing an example of the layer structure of exterior components.This is a micrograph showing the surface of an aluminum alloy foil used for evaluating corrosion resistance, specifically a micrograph showing a surface without corrosion.This is a micrograph showing the surface of an aluminum alloy foil used for evaluating corrosion resistance, specifically a micrograph showing a corroded surface.This diagram shows a side view of the electrode body with the outer casing wrapped around it during the manufacturing process of an energy storage device according to Embodiment 1.This diagram shows, from below, the state in which the outer casing material is wrapped around the electrode body during the manufacturing process of the energy storage device according to Embodiment 1.This figure schematically shows a portion of the VI-VI cross-section in Figure 2.This is a diagram illustrating the method for forming the second sealing portion.This is a flowchart showing the manufacturing procedure for an energy storage device according to Embodiment 1.This is a schematic plan view showing an energy storage device according to Embodiment 2.This is a schematic side view illustrating an energy storage device.This is a schematic perspective view of the lid.This figure shows a first example in which the cover and electrode terminals are integrally formed.This figure shows a second example in which the cover and electrode terminals are integrally formed.This is a flowchart showing the manufacturing procedure for an energy storage device according to Embodiment 2.This is a flowchart showing another manufacturing procedure for an energy storage device according to Embodiment 2.This diagram shows the electrode body with the outer covering wrapped around it, as viewed from the side, in Embodiment 3.This figure shows, from below, the state in which the outer casing member is wrapped around the electrode body and the lid is attached to the outer casing member in Embodiment 3.This is a flowchart showing the manufacturing procedure for an energy storage device according to Embodiment 3.This is a schematic plan view showing an energy storage device according to Embodiment 4.This is a schematic side view showing an energy storage device according to Embodiment 4.This diagram shows a modified example, with the outer covering wrapped around the electrode body, viewed from the side.This is a schematic perspective view showing a modified energy storage device.This is a schematic perspective view showing a modified cover and electrode terminals attached to the cover.Figure 23 is a schematic perspective view showing the energy storage device with the cover attached.This is a schematic front view showing the lid of another modified example.This is a schematic front view showing the lid of yet another modified example.This is a schematic plan view showing another modified example of an energy storage device. The embodiments of the present invention will be described in detail below with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and their descriptions will not be repeated. In this specification, numerical ranges indicated by "～" mean "greater than or equal to" and "less than or equal to." For example, the notation 2～15mm means 2mm or more and 15mm or less. [1. Embodiment 1] <1-1. Configuration of the energy storage device> Figure 1 is a schematic perspective view showing an energy storage device 10 according to this embodiment 1. Figure 2 is a schematic plan view showing the energy storage device 10. Figure 3A is a schematic side view showing the energy storage device 10. Figures 3B to 3E are cross-sectional views showing the layer structure of the exterior member 101 of the energy storage device 10. In Figures 2 and 3A, the direction of arrow UD indicates the thickness direction of the energy storage device 10, and the direction of arrow LR indicates the width direction of the energy storage device 10. Also, the direction of arrow FB indicates the depth direction of the energy storage device 10. The directions indica