# US 2026/0100347 A1 · Method for manufacturing battery

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- Number: US 2026/0100347 A1
- Document ID: US20260100347A1
- Status: Published application
- Kind: A1
- Application number: 19/207,835
- Filed: 2025-05-14
- Published: 2026-04-09
- Earliest claimed: 2024-10-04
- Assignees: Toyota Jodosha Kabushiki Kaisha
- Applicants: Toyota Jodosha Kabushiki Kaisha
- Inventors: Masato ONO; Tadashi Teranishi; Yusuke Oishi
- Web page: https://patentgrep.com/patent/US20260100347A1

## CPC

- H01M 4/0435: {Rolling or calendering}
- H01M 4/0471: {involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis}
- H01M 4/139: Processes of manufacture
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- 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

The method of the present disclosure for manufacturing a battery includes roller conveying a heated elongated sheet-like bipolar electrode laminate with a conveyor roller. In the method of the present disclosure, the first electrode active material layer is composed of a plurality of island portions extending in the conveying direction, and there is at least one gap portion extending in the conveying direction between the plurality of island portions, and the temperature drop of the bipolar electrode laminate when the bipolar electrode laminate passes through the conveyor roller is 30° C. or more, and the conveyor roller has a projecting portion or a gas discharge portion at a position overlapping with the gap portion or an opposite side surface thereof, so that a stretching stress in the transverse direction is applied to the gap portion when the bipolar electrode laminate is conveyed by the conveyor roller.

## Claims

### Claim 1

A method for manufacturing a battery, the method comprising conveying a heated elongated sheet-shaped bipolar electrode laminate by a conveyor roller, wherein
the bipolar electrode laminate includes a first electrode active material layer, a current collector layer, and a second electrode active material layer in this order,
the first electrode active material layer includes a plurality of island portions extending in a conveying direction with at least one gap portion extending in the conveying direction between the island portions,
a temperature decrease of the bipolar electrode laminate when the bipolar electrode laminate passes over the conveyor roller is 30° C. or more, and
the conveyor roller includes a projecting portion or a gas discharge portion positioned to overlap the gap portion or a surface opposite to the gap portion such that a transverse stretching stress is applied to the gap portion during roller conveying for the bipolar electrode laminate by the conveyor roller.

### Claim 2 (depends on 1)

The method according to claim 1, wherein a width of each of the projecting portion and the gas discharge portion is equal to or smaller than a width of the gap portion.

### Claim 3 (depends on 1)

The method according to claim 1, wherein a sectional shape of the projecting portion is a rounded quadrangular shape.

### Claim 4 (depends on 1)

The method according to claim 1, further comprising drying the first electrode active material layer and the second electrode active material layer by laser heating prior to the roller conveying.

### Claim 5 (depends on 4)

The method according to claim 4, further comprising pressing the bipolar electrode laminate prior to the drying.