# US 11,909,074 B2 · Flexible battery manufacturing method

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- Number: US 11,909,074 B2
- Document ID: US11909074B2
- Status: Granted
- Kind: B2
- Application number: 17/044,072
- Filed: 2019-06-11
- Published: 2021-05-13
- Granted: 2024-02-20
- Earliest claimed: 2018-06-11
- Assignees: Amogreentech Co., Ltd.
- Applicants: Amogreentech Co., Ltd.
- Inventors: Hyeon Woo Cho; Ju Hee Jang
- Web page: https://patentgrep.com/patent/US11909074B2

## CPC

- H01M 10/0436: {Small-sized flat cells or batteries for portable equipment}
- H01M 50/618: Pressure control
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/058: Construction or manufacture
- H01M 50/105: Pouches or flexible bags
- H01M 50/128: with two or more layers of only inorganic material
- H01M 50/136: Flexibility or foldability
- H01M 10/052: Li-accumulators
- 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 manufacturing method for a flexible battery including injecting an electrolyte into an opening of an exterior material accommodating an electrode assembly contained therein and impregnating the electrode assembly with the electrolyte through a pressure difference inside the exterior material; and a sealing step of sealing the opening. Because the electrode assembly provided in the battery can be completely impregnated with an electrolyte, no spot occurs on the surface of a negative electrode filled with the electrolyte. In addition, the flexible battery can prevent or minimize deterioration of physical characteristics that the battery is required to exhibit, even if repeated bending occurs.

## Claims

### Claim 1

A method for manufacturing a flexible battery, comprising:
an injection step of injecting an electrolyte into an opening of an exterior material accommodating an electrode assembly contained therein;
an impregnation step of impregnating the electrode assembly with the electrolyte through a pressure difference inside the exterior material; and
a sealing step of sealing the opening,
wherein a pressure increasing/decreasing process is performed in the impregnation step and one cycle thereof comprises the steps of:
(1) decreasing the pressure inside the exterior material through the injected electrolyte;
(2) maintaining the decreased pressure for a predetermined period of time; and
(3) restoring the pressure inside the exterior material to 700 torr to 780 torr,
wherein the pressure increasing/decreasing process is performed four to eight times with a gradient in the decreased pressure, and
wherein the decreased pressure of the pressure increasing/decreasing process performed in the next turn is performed at a pressure of 40% to 80% of the decreased pressure of the pressure increasing/decreasing process performed in the previous turn.

### Claim 2 (depends on 1)

The method of claim 1, wherein in each of the pressure increasing/decreasing process, the one cycle of steps (1) to (3) is performed two to four times.

### Claim 3 (depends on 2)

The method of claim 2, wherein after performing step (3), the restored pressure is maintained for 0.3 to 2 minutes when step (1) of the next cycle is performed.

### Claim 4 (depends on 1)

The method of claim 1, wherein the exterior material of step (1) is sealed in an area excluding the opening for injecting the electrolyte.

### Claim 5 (depends on 1)

The method of claim 1, wherein step (2) is performed for 0.3 to 2 minutes.

### Claim 6 (depends on 1)

The method of claim 1, wherein the decreased pressure of the pressure increasing/decreasing process finally performed is 3.5 to 9.5% of the initial pressure.

### Claim 7 (depends on 1)

The method of claim 1, further comprising a process of forming a pattern for contraction and relaxation in a longitudinal direction when bending part or all of the surface of the exterior material.

### Claim 8 (depends on 1)

The method of claim 1, wherein a spot area due to an impregnation error of the electrolyte is 1% or less based on a total area of an upper area of a negative electrode in contact with a positive electrode in the flexible battery manufactured through the manufacturing method.