# US 2025/0096375 A1 · Packaging material for power storage device and power storage device including packaging material

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- Number: US 2025/0096375 A1
- Document ID: US20250096375A1
- Status: Published application
- Kind: A1
- Application number: 18/962,813
- Filed: 2024-11-27
- Published: 2025-03-20
- Earliest claimed: 2022-05-30
- Assignees: Toppan Holdings Inc.
- Applicants: Toppan Holdings Inc.
- Inventors: Taketo NUMAZAWA; Koji MURATA
- Web page: https://patentgrep.com/patent/US20250096375A1

## CPC

- H01M 50/129: with two or more layers of only organic material
- H01G 11/78: Cases; Housings; Encapsulations; Mountings
- H01G 11/80: Gaskets; Sealings
- H01M 50/105: Pouches or flexible bags
- H01M 50/119: Metals
- H01M 50/121: Organic material
- H01M 50/124: having a layered structure
- H01M 50/126: comprising three or more layers
- H01M 50/131: characterised by physical properties, e.g. gas permeability, size or heat resistance
- H01M 50/172: Arrangements of electric connectors penetrating the casing
- H01M 50/193: Organic material
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A packing material for a power storage device includes a laminated structure including a substrate layer, a first adhesive layer, a metal foil layer, a second adhesive layer, and a sealant layer in this order, the second adhesive layer including a reaction product of at least acid-modified polyolefin and a multifunctional isocyanate compound, and the second adhesive layer satisfies a condition expressed by an inequality of the following Formula (1): 0.01≤{(C+D)−B}/A≤0.60 . . . (1) [where A to D represent intensities in infrared absorption spectra of the second adhesive layer measured by infrared spectroscopy, A represents a maximum intensity between wavenumbers 3040 and 2760 cm-1, B represents a maximum intensity between wavenumbers 1850 and 1780 cm-1, C represents a maximum intensity between wavenumbers 1760 and 1600 cm-1, and D represents a maximum intensity between wavenumbers 2150 and 2090 cm-1.]

## Claims

### Claim 1

A packaging material for a power storage device, comprising
a laminated structure including a substrate layer, a first adhesive layer, a metal foil layer, a second adhesive layer, and a sealant layer in this order, wherein
the second adhesive layer includes a reaction product of at least an acid-modified polyolefin and a multifunctional isocyanate compound, and
the second adhesive layer satisfies a condition expressed by an inequality of the following Formula (1):
0.01
≤
{
(
C
+
D
)
-
B
}
/
A
≤
0
.60
(
1
)
[where A to D represent intensities in infrared absorption spectra of the second adhesive layer measured by infrared spectroscopy, A represents a maximum intensity between wavenumbers 3040 and 2760 cm-1, B represents a maximum intensity between wavenumbers 1850 and 1780 cm-1, C represents a maximum intensity between wavenumbers 1760 and 1600 cm-1, and D represents a maximum intensity between wavenumbers 2150 and 2090 cm-1.]

### Claim 2 (depends on 1)

The packaging material of claim 1, wherein the multifunctional isocyanate compound includes at least one selected from a group of a multimer of an aliphatic multifunctional isocyanate compound and a multimer of a multifunctional isocyanate compound including an aromatic ring.

### Claim 3 (depends on 1)

The packaging material of claim 1, comprising an anticorrosion treatment layer between the first adhesive layer and the metal foil layer or between the second adhesive layer and the metal foil layer, or anticorrosion treatment layers between the first adhesive layer and the metal foil layer and between the second adhesive layer and the metal foil layer.

### Claim 4 (depends on 1)

The packaging material of claim 1, wherein the sealant layer includes at least one of a polyolefin-based resin and a polyester-based resin.

### Claim 5 (depends on 1)

The packaging material of claim 1, wherein at least one of the first adhesive layer and the second adhesive layer includes a hydrogen sulfide adsorbent.

### Claim 6 (depends on 1)

The packaging material of claim 1, wherein the second adhesive layer further includes a carbodiimide compound.

### Claim 7 (depends on 1)

The packaging material of claim 1, wherein the packaging material is for a solid-state battery.

### Claim 8 (depends on 1)

A power storage device, comprising:
a power storage device body;
a current output terminal that extends from the power storage device body; and
the packaging material of claim 1, the packaging material pinching the current output terminal and accommodating the power storage device body.

### Claim 9 (depends on 8)

The power storage device of claim 8, wherein the power storage device is a solid-state battery.