# US 2026/0088366 A1 · Manufacturing method of battery

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- Number: US 2026/0088366 A1
- Document ID: US20260088366A1
- Status: Published application
- Kind: A1
- Application number: 19/410,182
- Filed: 2025-12-05
- Published: 2026-03-26
- Earliest claimed: 2021-08-10
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Kodai Shintani
- Web page: https://patentgrep.com/patent/US20260088366A1

## CPC

- H01M 10/0585: of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 50/609: Arrangements or processes for filling with liquid, e.g. electrolytes
- 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 of a battery includes: an injection step of injecting the electrolytic solution into the intermediate member via an unsealed portion; and a permeation step of causing the electrolytic solution to permeate the intermediate member. The electrode body includes a power generation element and a first collector terminal and a second collector terminal. The power generation element has a first side and a second side corresponding to long sides in the rectangular shape of the power generation element, and a third side and a fourth side corresponding to short sides in the rectangular shape of the power generation element. The first collector terminal and the second collector terminal are placed on the first side and on the second side, respectively. In the permeation step, the intermediate member is placed such that the first side is placed on a vertically lower side as a first arrangement state.

## Claims

### Claim 1

A manufacturing method of a battery, the manufacturing method comprising:
a preparing step of preparing an intermediate member including an electrode body sealed by an outer packaging body and an unsealed portion via which an electrolytic solution is to be injected;
an injection step of injecting the electrolytic solution into the intermediate member via the unsealed portion;
a permeation step of causing the injected electrolytic solution to permeate the intermediate member; and
an inlet sealing step of sealing the unsealed portion after the permeation step, wherein:
the electrode body includes a power generation element having a rectangular shape in a plan view, and a first collector terminal and a second collector terminal connected to the power generation element;
in the plan view, the power generation element has a first side and a second side corresponding to long sides in the rectangular shape of the power generation element, and a third side and a fourth side corresponding to short sides in the rectangular shape of the power generation element;
the first collector terminal and the second collector terminal are placed on the first side and on the second side, respectively;
in the injection step, the electrolytic solution is injected into the intermediate member in a first arrangement state where the intermediate member is placed such that the first side is placed on a vertically lower side of the intermediate member;
in the permeation step, the electrolytic solution is caused to permeate the intermediate member in the first arrangement state;
in the plan view, the outer packaging body includes a first sealing portion placed outwardly from the first side, a second sealing portion placed outwardly from the second side, a third sealing portion placed outwardly from the third side, and a fourth sealing portion placed outwardly from the fourth side; and
the unsealed portion is provided on the fourth sealing portion of the outer packaging body at a position higher than a middle point of the fourth sealing portion, and the unsealed portion is unsealed in the permeation step.

### Claim 2 (depends on 1)

The manufacturing method according to claim 1, wherein, in the first arrangement state, a position of the unsealed portion is higher than a position of the second side.

### Claim 3 (depends on 1)

The manufacturing method according to claim 1, wherein the intermediate member remains in the first arrangement state for entire duration of the permeation step.

### Claim 4 (depends on 1)

The manufacturing method according to claim 1, wherein the unsealed portion is provided on an extension line extending from a connecting portion where the second side connects to the fourth side.

### Claim 5 (depends on 1)

The manufacturing method according to claim 1, wherein the unsealed portion is placed on a line segment that connects a first intersecting point between the fourth sealing portion and the first sealing portion with a second intersecting point between the fourth sealing portion and the second sealing portion.

### Claim 6

A manufacturing method of a battery, the manufacturing method comprising:
a preparing step of preparing an intermediate member including an electrode body sealed by an outer packaging body and an unsealed portion via which an electrolytic solution is to be injected;
an injection step of injecting the electrolytic solution into the intermediate member via the unsealed portion;
a permeation step of causing the injected electrolytic solution to permeate the intermediate member; and
an inlet sealing step of sealing the unsealed portion after the permeation step, wherein:
the electrode body includes a power generation element having a rectangular shape in a plan view, and a first collector terminal and a second collector terminal connected to the power generation element;
in the plan view, the power generation element has a first side and a second side corresponding to long sides in the rectangular shape of the power generation element, and a third side and a fourth side corresponding to short sides in the rectangular shape of the power generation element;
the first collector terminal and the second collector terminal are placed on the first side and on the second side, respectively;
in the injection step, the electrolytic solution is injected into the intermediate member in a first arrangement state where the intermediate member is placed such that the first side is placed on a vertically lower side of the intermediate member;
in the permeation step, the electrolytic solution is caused to permeate the intermediate member in the first arrangement state; and
the unsealed portion is provided on a sealing portion of the outer packaging body placed outwardly from the fourth side at a position higher than a middle point of the sealing portion, and the unsealed portion is unsealed in the permeation step.