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JP-2026075548-A - Energy storage device, lid, method for manufacturing the lid, method for manufacturing the energy storage device

JP2026075548AJP 2026075548 AJP2026075548 AJP 2026075548AJP-2026075548-A

Abstract

[Problem] To provide an energy storage device comprising an outer film and a lid, which maintains high sealing performance even when an electrolyte containing hydrofluoric acid comes into contact with the lid. [Solution] Electrode body and The outer film enclosing the electrode body, The system comprises a lid that seals the electrode body together with the outer film, The aforementioned cover is A lid body made of a conductive material, A covering body comprising a resin material and covering the lid body, It has a bonding layer that joins the lid body and the covering, The bonding layer is formed of a cured product of a resin composition containing a resin and a curing agent, in an energy storage device.

Inventors

  • 金澤 早陽子
  • 住田 裕代
  • 佐々木 美帆

Assignees

  • 大日本印刷株式会社

Dates

Publication Date
20260508
Application Date
20241022

Claims (20)

  1. Electrode body and The outer film enclosing the electrode body, The system comprises a lid that seals the electrode body together with the outer film, The aforementioned cover is A lid body made of a conductive material, A covering body comprising a resin material and covering the lid body, It has a bonding layer that joins the lid body and the covering, The bonding layer is formed of a cured product of a resin composition containing a resin and a curing agent, in an energy storage device.
  2. The energy storage device according to claim 1, wherein the resin of the bonding layer has functional groups that can react with the curing agent.
  3. The energy storage device according to claim 1, wherein the resin of the bonding layer comprises at least one of an acid-modified polyolefin and a polyolefin.
  4. The energy storage device according to claim 1 or 2, wherein the basic framework of the resin material constituting the coating and the basic framework of the resin constituting the bonding layer are common.
  5. The energy storage device according to claim 1 or 2, wherein the thickness of the bonding layer is thinner than the thickness of the coating.
  6. The energy storage device according to claim 1 or 2, wherein the bonding layer is a coating or film.
  7. The energy storage device according to claim 1 or 2, wherein the thickness of the bonding layer is within the range of 0.5 μm to 20 μm.
  8. The energy storage device according to claim 1 or 2, wherein the thickness of the bonding layer is within the range of 5 μm to 500 μm.
  9. The energy storage device according to claim 1 or 2, wherein the lid body further comprises a surface treatment layer on at least a portion of the surface to be joined with the bonding layer.
  10. The energy storage device according to claim 1 or 2, wherein at least a portion of the surface of the lid body that is bonded to the bonding layer shows a peak originating from the chromium compound Cr2p3/2 in the range of 576 eV to 581 eV, as detected by X-ray photoelectron spectroscopy.
  11. The energy storage device according to claim 1 or 2, wherein at least a portion of the surface of the lid body that is joined to the bonding layer is a rough surface.
  12. The energy storage device according to claim 1 or 2, wherein the curing agent comprises at least one selected from the group consisting of compounds having an isocyanate group, carbodiimide compounds, compounds having an oxazoline group, compounds having an epoxy group, glycidyl compounds, compounds having a carboxyl group, melamine compounds, phenolic resins, acid anhydrides, thiol compounds, compounds having an amine group, and urea compounds.
  13. A lid used as an outer casing for an energy storage device, A lid body made of a conductive material, A covering body comprising a resin material and covering a part of the lid body, It has a bonding layer that joins the lid body and the covering, The aforementioned bonding layer is formed of a cured product of a resin composition containing a resin and a curing agent, and is a lid.
  14. The lid according to claim 13, wherein the resin in the bonding layer has functional groups that can react with the curing agent.
  15. The lid according to claim 13 or 14, wherein the resin comprises at least one of an acid-modified polyolefin and a polyolefin.
  16. The lid according to claim 13 or 14, wherein the resin in the bonding layer has functional groups that can react with the curing agent.
  17. The lid according to claim 13 or 14, wherein the thickness of the bonding layer is thinner than the thickness of the covering.
  18. The lid according to claim 13 or 14, wherein the bonding layer is a coating or film.
  19. The lid according to claim 13 or 14, wherein the thickness of the bonding layer is within the range of 0.5 μm to 20 μm.
  20. The lid according to claim 13 or 14, wherein the thickness of the bonding layer is within the range of 5 μm to 500 μm.

Description

This disclosure relates to an energy storage device, a cover, a method for manufacturing the cover, and a method for manufacturing the energy storage device. Patent Document 1 discloses an example of an energy storage device. This energy storage device comprises an electrode body including a current collector, an outer casing that seals the electrode body, and electrode terminals connected to the current collector. The outer casing comprises an outer film that encloses the electrode body and a lid that is joined to the outer film. The electrode terminals are inserted into through holes formed in the lid. Japanese Patent Publication No. 2022-123686 A perspective view of the energy storage device according to the embodiment.Figure 1A shows a diagram illustrating the method for measuring the seal strength of the second sealing portion of the energy storage device.A cross-sectional view showing the layer structure of the outer film of the energy storage device shown in Figure 1A.Figure 1A shows the outer film of the energy storage device in its unfolded state.Figure 1A is a perspective view of the rear side of the cover of the energy storage device.Figure 4 is a perspective view of the front side of the lid.A cross-sectional view along the line D6-D6 in Figure 1A.A cross-sectional view along the line D7-D7 in Figure 1A.A flowchart showing an example of a manufacturing method for the energy storage device in Figure 1A.An enlarged view of the flange portion of the cover of the first modified energy storage device.An enlarged view of the flange portion of the cover of the second modified energy storage device. The following describes an energy storage device according to one embodiment of this disclosure, with reference to the drawings. 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. [Embodiment] <1-1. Configuration of the energy storage device> Figure 1A is a schematic plan view showing an embodiment of the energy storage device 10. Figure 1B is a diagram showing a method for measuring the seal strength of the second sealing portion 120 of the energy storage device 10 in Figure 1A. Figure 2 is a cross-sectional view showing the layer structure of the outer film 50 provided on the energy storage device 10 in Figure 1A. Figure 3 is a view of the outer film 50 provided on the energy storage device 10 in Figure 1A in an unfolded state. Figure 4 is a perspective view of the back side of the lid 60 provided on the energy storage device 10 in Figure 1A. Figure 5 is a perspective view of the front side of the lid 60 in Figure 4. Figure 6 is a cross-sectional view along the line D6-D6 in Figure 1A. Figure 7 is a cross-sectional view along the line D7-D7 in Figure 1A. In Figure 1A, the direction of arrow UD indicates the thickness direction of the energy storage device 10, the direction of arrow LR indicates the width direction of the energy storage device 10, and the direction of arrow FB indicates the depth direction of the energy storage device 10. The directions indicated by each of the arrows UDLRFB are the same in all subsequent diagrams. The energy storage device 10 comprises an electrode body 20 including a current collector 30 and an outer casing 40. The electrode body 20 includes electrodes (positive and negative electrodes) and separators that constitute energy storage components such as lithium-ion batteries, capacitors, all-solid-state batteries, semi-solid-state batteries, pseudo-solid-state batteries, polymer batteries, all-resin batteries, lead-acid batteries, nickel-metal hydride batteries, nickel-cadmium batteries, nickel-iron batteries, nickel-zinc batteries, silver oxide-zinc batteries, metal-air batteries, polyvalent cation batteries, or capacitors. In this embodiment, the shape of the electrode body 20 is substantially rectangular. "Substantially rectangular" includes not only a perfect rectangular prism but also a solid that can be considered a rectangular prism by modifying, for example, the shape of a part of its outer surface. The shape of the electrode body 20 may be, for example, a cylinder or a polygonal prism. One end 31 of the current collector 30 (see Figure 7) is connected to the cover 60. The outer casing 40 seals the electrode body 20. The outer casing 40 comprises an outer film 50 and a lid 60. The outer film 50 wraps around the electrode body 20. In this embodiment, the outer film 50 is wrapped around the electrode body 20. The lid 60 is positioned to the side of the electrode body 20 in the FB direction. In another example, the electrode body 20 may be housed inside a cylindrical outer film 50 with openings at both ends in the FB direction, and the openings may be closed by the lid 60. In yet another example, the electrode body 20 may be housed inside a cylindrical outer film 50 with openings, connected to the lid 60, and the openings may be closed