# US 12,603,401 B2 · Terminal resin film and power storage device using same

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- Number: US 12,603,401 B2
- Document ID: US12603401B2
- Status: Granted
- Kind: B2
- Application number: 18/196,302
- Filed: 2023-05-11
- Published: 2023-10-05
- Granted: 2026-04-14
- Earliest claimed: 2020-11-13
- Assignees: Toppan Inc.
- Applicants: Toppan Inc.
- Inventors: Junya Imamoto
- Web page: https://patentgrep.com/patent/US12603401B2

## CPC

- H01M 50/562: characterised by the material
- B32B 7/02: Physical, chemical or physicochemical properties
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 15/095: comprising polyurethanes
- B32B 15/18: comprising iron or steel {(B32B15/011, B32B15/012 and B32B15/013 take precedence)}
- B32B 15/20: comprising aluminium or copper {(B32B15/016 and B32B15/017 take precedence)}
- B32B 27/08: of synthetic resin
- B32B 27/18: characterised by the use of special additives
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 27/34: comprising polyamides
- B32B 27/36: comprising polyesters
- B32B 27/40: comprising polyurethanes
- C09J 151/06: grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
- B32B 2250/05: 5 or more layers
- B32B 2250/242: All polymers belonging to those covered by group B32B27/32
- B32B 2250/40: Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
- B32B 2307/31: Heat sealable
- B32B 2307/54: Yield strength; Tensile strength
- B32B 2307/7376: Thickness
- B32B 2451/00: Decorative or ornamental articles
- B32B 2457/10: Batteries
- H01M 10/052: Li-accumulators
- H01M 50/105: Pouches or flexible bags
- H01M 50/178: for pouch or flexible bag cells
- H01M 50/183: Sealing members
- H01M 50/186: characterised by the disposition of the sealing members
- H01M 50/193: Organic material
- H01M 50/197: having a layered structure
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A terminal resin film of at least seven layers, with at least a layer A, a layer B, a layer C, and a layer D, and a structure being layer A, the layer B, the layer A, and the layer C or the layer D; or, the structure being layer A, the layer B, and the layer A, and Layer A: A layer formed from a resin composition including an acid-modified polyolefin resin and having an MFR of 2.0 to 50 g/10 mins; Layer B: A layer formed from a resin composition including a polyolefin resin and having an MFR of 0.05 g/10 mins or more and less than 2.0 g/10 mins; Layer C: A layer formed from a resin composition including an unmodified polyolefin resin and having an MFR of 0.05 to 50 g/10 mins; and, Layer D: An adhesive layer including a resin having a cross-linked structure.

## Claims

### Claim 1

A terminal resin film that is disposed to cover an outer peripheral surface of a portion of a metal terminal electrically connected to a power storage device body constituting a power storage device, the terminal resin film, comprising:
at least seven layers, wherein
the at least seven layers among layers constituting the terminal resin film each of which corresponds to at least one layer selected from a group consisting of a layer A, a layer B, a layer C, and a layer D indicated below, and wherein
at least a portion of the terminal resin film has a structure in which the layer A, the layer B, the layer A, and the layer C are stacked in this order or the layer D, the layer A, the layer B, and the layer A are stacked in this order,
where,
the layer A is formed from a resin composition including an acid-modified polyolefin resin and having a melt flow rate of 2.0 to 50 g/10 mins at 230° C.,
the layer B is formed from a resin composition including a polyolefin resin and having a melt flow rate of 0.05 g/10 mins or more and less than 2.0 g/10 mins at 230° C.,
the layer C is formed from a resin composition including an unmodified polyolefin resin and having a melt flow rate of 0.05 to 50 g/10 mins at 230° C., and
the layer D is an adhesive layer including a resin having a cross-linked structure.

### Claim 2 (depends on 1)

The terminal resin film of claim 1, wherein
the acid-modified polyolefin resin used in the layer A has a melting point of 100° C. or more and less than 160° C., the polyolefin resin used in the layer B has a melting point of 130 to 175° C., and the unmodified polyolefin resin used in the layer C has a melting point of 160 to 175° C.

### Claim 3 (depends on 1)

The terminal resin film of claim 1, wherein
the unmodified polyolefin resin used in the layer C has a melting point higher than or equal to a melting point of the polyolefin resin used in the layer B.

### Claim 4 (depends on 1)

The terminal resin film of claim 1, wherein
all of the layers constituting the terminal resin film correspond to at least one layer selected from a group consisting of the layer A, the layer B, and the layer C.

### Claim 5 (depends on 1)

The terminal resin film of claim 1, wherein
all of the layers constituting the terminal resin film correspond to at least one layer selected from a group consisting of the layer A, the layer B, and the layer D.

### Claim 6 (depends on 1)

The terminal resin film of claim 1, wherein
the layer D is formed from an adhesive composition including an acid-modified polyolefin resin and at least one curing agent selected from a group consisting of a polyfunctional isocyanate compound, a glycidyl compound, a compound having a carboxy group, and a compound having an oxazoline group.

### Claim 7 (depends on 1)

The terminal resin film of claim 1, wherein
among the layers constituting the terminal resin film, a total thickness of layers corresponding to the layer A is greater than or equal to a total thickness of layers corresponding to the layer B.

### Claim 8 (depends on 1)

The terminal resin film of claim 1, wherein
a total thickness is 160 μm or more.

### Claim 9 (depends on 1)

A power storage device, comprising:
a power storage device body;
a metal terminal electrically connected to the power storage device body;
an exterior material holding the metal terminal therebetween and accommodating the power storage device body; and
the terminal resin film of claim 1 that covers an outer peripheral surface of a portion of the metal terminal and is disposed between the metal terminal and the exterior material.