# US 11,909,027 B2 · Method for manufacturing electrode and apparatus for manufacturing electrode

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- Number: US 11,909,027 B2
- Document ID: US11909027B2
- Status: Granted
- Kind: B2
- Application number: 17/511,989
- Filed: 2021-10-27
- Published: 2022-05-19
- Granted: 2024-02-20
- Earliest claimed: 2020-11-18
- Assignees: Prime Planet Energy & Solutions, Inc.; Toyota Jidosha Kabushiki Kaisha
- Applicants: Prime Planet Energy & Solutions, Inc.; Toyota Jidosha Kabushiki Kaisha
- Inventors: Tetsuya Mimura; Katsushi Enokihara
- Web page: https://patentgrep.com/patent/US11909027B2

## CPC

- H01M 4/0404: {by coating on electrode collectors}
- B29C 43/24: Calendering
- B29C 43/28: incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
- B29C 43/46: Rollers
- B32B 5/16: characterised by features of a layer formed of particles, e.g. chips, powder {or granules (layer formed of natural mineral particles B32B19/00; layer being formed of wood fibres, chips or particles B32B21/02)}
- B32B 15/16: next to a particulate layer
- B32B 15/20: comprising aluminium or copper {(B32B15/016 and B32B15/017 take precedence)}
- H01M 4/0435: {Rolling or calendering}
- H01M 4/139: Processes of manufacture
- B29C 2043/5825: {dimensions or shape, e.g. size, thickness}
- B29C 2043/5875: {the material feed to the moulds or mould parts, e.g. controlling feed flow, velocity, weight, doses}
- B32B 2037/243: {Coating}
- B32B 2457/10: Batteries
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- 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
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- 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 method for manufacturing an electrode disclosed herein includes: steps of forming a coating film composed of an electrode material by passing the electrode material through a gap between a rotating first roll and a rotating second roll; adhering the coating film to the second roll and conveying the coating film; and transferring the conveyed coating film onto an electrode current collector conveyed by a conveying device to form an electrode mixture layer composed of the coating film. The speed ratio between a peripheral speed of the second roll and a conveying speed of the electrode current collector is changed by changing the peripheral speed of the second roll on the basis of the thickness of the coating film or the width of the gap. The timing of the change in the speed ratio is allowed to be based on the Equation (1) described in the description.

## Claims

### Claim 1

A method for manufacturing an electrode, the method comprising:
forming a coating film composed of an electrode material by passing the electrode material through a gap between a rotating first roll and a rotating second roll, the gap having a width defined by a distance between an outer circumference of the first roll and an outer circumference of the second roll;
adhering the coating film composed of the electrode material to the second roll and conveying the coating film;
measuring the thickness of the coating film adhered to the second roll or measuring the width of the gap;
transferring the conveyed coating film onto an electrode current collector conveyed by a conveying device to form an electrode mixture layer composed of the coating film; and
changing a speed ratio between a peripheral speed of the second roll and a conveying speed of the electrode current collector by changing the peripheral speed of the second roll on the basis of the measured thickness of the coating film or the measured width of the gap; and
calculating a timing of the change in the speed ratio using Equation (1):
t=t_const×(Bx/Bave) (1), wherein
(a) when the peripheral speed of the second roll is changed based on the measured thickness of the coating film, the variables in Equation (1) are defined as follows:
t: a waiting time from the measurement of the thickness of the coating film adhered to the second roll to an execution of the peripheral speed change of the second roll;
t_const: a set value of a waiting time from the measurement of the thickness of the coating film adhered to the second roll to the execution of the peripheral speed change of the second roll;
Bx: the measured value of the thickness of the coating film adhered to the second roll;
Bave: an average of measured values of the thickness of the coating film adhered to the second roll;
(b) when the peripheral speed of the second roll is changed based on the measured width of the gap, the variables in Equation (1) are defined as follows:
t: a waiting time from coating film formation in the gap to an execution of peripheral speed change of the second roll;
t_const: a set value of a waiting time from coating film formation in the gap to the execution of peripheral speed change of the second roll;
Bx: the measured value of the gap width;
Bave: an average of measured values of the gap width;
wherein the speed ratio is changed at the calculated timing.

### Claim 2 (depends on 1)

The method for manufacturing an electrode according to claim 1, wherein the electrode material is a wet granulated material.