# US 12,218,313 B2 · Nonaqueous electrolyte secondary battery

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- Number: US 12,218,313 B2
- Document ID: US12218313B2
- Status: Granted
- Kind: B2
- Application number: 17/727,813
- Filed: 2022-04-25
- Published: 2022-10-27
- Granted: 2025-02-04
- Earliest claimed: 2021-04-26
- Assignees: Prime Planet Energy & Solutions, Inc.
- Applicants: Prime Planet Energy & Solutions, Inc.
- Inventors: Masashi Muraoka; Kazuki Takeno
- Web page: https://patentgrep.com/patent/US12218313B2

## CPC

- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/0587: of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
- H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M 10/056: characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M 10/0569: characterised by the solvents
- H01M 50/103: prismatic or rectangular (H01M50/109, H01M50/11 take precedence)
- H01M 50/105: Pouches or flexible bags
- H01M 50/417: Polyolefins
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- H01M 2004/027: {Negative electrodes}
- H01M 2300/0028: characterised by the solvent
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A nonaqueous electrolyte secondary battery includes an exterior package, an electrode assembly, and an electrolyte solution. In a cross section orthogonal to a winding axis of the laminated assembly, the electrode assembly has a contour line having a corner-rounded rectangular shape. The contour line consists of a first arc-shaped portion, a straight line portion, and a second arc-shaped portion. The contour line has a height ratio (R1=H0/H1) of 1.20 to 1.35. H0 represents a distance between two points most distant from each other on the contour line. H1 represents an average length of the two line segments. The separator includes a first main surface and a second main surface. The first main surface is in contact with the negative electrode plate. A first dynamic coefficient of friction between the first main surface and the negative electrode plate is 0.52 to 0.66.

## Claims

### Claim 1

A nonaqueous electrolyte secondary battery comprising:
an exterior package;
an electrode assembly; and
an electrolyte solution, wherein
the exterior package accommodates the electrode assembly and the electrolyte solution,
the electrode assembly includes a laminated assembly,
the laminated assembly includes a positive electrode plate, a separator, and a negative electrode plate,
the separator separates the positive electrode plate and the negative electrode plate from each other,
the laminated assembly is spirally wound,
in a cross section orthogonal to a winding axis of the laminated assembly, the electrode assembly has a contour line having a corner-rounded rectangular shape,
the contour line consists of a first arc-shaped portion, a straight line portion, and a second arc-shaped portion,
the straight line portion consists of two line segments,
the straight line portion connects the first arc-shaped portion and the second arc-shaped portion to each other,
the contour line has a height ratio of 1.20 to 1.35,
the height ratio is calculated by the following formula (α):
R1=H0/H1 (α), where
R1 represents the height ratio,
H0 represents a distance between two points most distant from each other on the contour line, and
H1 represents an average length of the two line segments,
the separator includes a first main surface and a second main surface,
the first main surface is in contact with the negative electrode plate, and
a first dynamic coefficient of friction between the first main surface and the negative electrode plate is 0.52 to 0.66.

### Claim 2 (depends on 1)

The nonaqueous electrolyte secondary battery according to claim 1, wherein
the negative electrode plate includes a negative electrode active material layer,
the negative electrode active material layer is in contact with the first main surface,
the negative electrode active material layer includes negative electrode active material particles, and
the negative electrode active material particles have a median value of circularities of 0.60 to 0.85.

### Claim 3 (depends on 2)

The nonaqueous electrolyte secondary battery according to claim 2, wherein
the negative electrode active material layer has a strip-like planar shape,
the electrode assembly has an aspect ratio of 2.0 to 2.5, and
the aspect ratio is calculated by the following formula (β):
R2=W/H1 (β), where
R2 represents the aspect ratio,
W represents a length of the negative electrode active material layer in a width direction, and
H1 represents the average length of the two line segments.

### Claim 4 (depends on 1)

The nonaqueous electrolyte secondary battery according to claim 1, wherein
the second main surface is in contact with the positive electrode plate, and
a second dynamic coefficient of friction between the second main surface and the positive electrode plate is 0.70 to 0.85.

### Claim 5 (depends on 1)

The nonaqueous electrolyte secondary battery according to claim 1, wherein the electrolyte solution includes methyl propionate.