Method for manufacturing electrode and electrode paste coating device

Patent metadata

Field	Value
Publication number	US-12418015-B2
Application number	US-202117521158-A
Country	US
Kind code	B2
Filing date	Nov 8, 2021
Priority date	Nov 18, 2020
Publication date	Sep 16, 2025
Grant date	Sep 16, 2025

Abstract

A method for manufacturing an electrode is provided, the method including coating and drying of an electrode paste and being able to highly suppress variations in the weight per unit area of the active material layer. The method for manufacturing an electrode disclosed herein includes the steps of: coating an electrode paste onto a current collecting foil from a die; and drying the coated electrode paste. Here, the current collecting foil is conveyed by a backup roll. A variation in at least one of thickness and width of the coated electrode paste is measured. The peripheral speed of the backup roll is changed according to a measurement result of the variation so that the variation becomes small.

First claim

What is claimed is:

1. A method for manufacturing an electrode, the method comprising the steps of:
continuously coating an electrode paste onto a current collecting foil from a die; and
drying the coated electrode paste,
wherein the continuously coating the electrode paste onto the current collecting foil comprises
discharging the electrode paste onto the current collecting foil from the die;
conveying the current collecting foil by a backup roll;
measuring a variation of a width of the coated electrode paste caused by an axial runout of the backup roll; and
changing, according to the measured variation of width, a peripheral speed of the backup roll so that the variation caused by the backup roll is reduced;
wherein the peripheral speed of the backup roll is changed based on Equation (2) below:
V BR =V BR_const ×{1−( W ( x )/ W ave −1)}  (2)

V BR : Peripheral speed of the backup roll,
V BR_coast : Set value of the peripheral speed of the backup roll,
W(x): Coating width at coating distance x, or coating width at time x,
W ave : Average value of coating width.

2. A method for manufacturing an electrode, the method comprising the steps of:
continuously coating an electrode paste onto a current collecting foil from a die; and
drying the coated electrode paste,
wherein the continuously coating the electrode paste onto the current collecting foil comprises
discharging the electrode paste onto the current collecting foil from the die;
conveying the current collecting foil by a backup roll;
measuring a variation in thickness of the coated electrode paste, wherein the variation is caused by an axial runout of the backup roll; and
changing, according to the measured variation of thickness, a peripheral speed of the backup roll so that the variation caused by the backup roll is reduced;
wherein the peripheral speed of the backup roll is changed based on Equation (3) below:
V BR =V BR_const ×{( D ( x ′)/ D ave )}  (3)

V BR : Peripheral speed of backup roll,
V BR_coast : Set value of the peripheral speed of the backup roll,
D(x′): Coating thickness at coating distance x′, or coating thickness at time x′,
D ave : Average value of coating thickness.

Assignees

• Prime Planet Energy & Solutions Inc
• Toyota Motor Co Ltd

Inventors

• Mimura Tetsuya
• ENOKIHARA Katsushi

Classifications

• H01M4/0404 Primary

  by coating on electrode collectors · CPC title

• B05C5/0245

  for applying liquid or other fluent material to a moving work of indefinite length, e.g. to a moving web (B05C5/0241, B05C5/0254, B05C5/027, B05C5/0283 take precedence) · CPC title

• B05C5/0254 Primary

  Coating heads with slot-shaped outlet (B05C5/0283 takes precedence) · CPC title

• B05C11/1023

  responsive to velocity of target, e.g. to web advancement rate · CPC title

• B05C11/1005

  responsive to condition of liquid or other fluent material already applied to the surface, e.g. coating thickness, weight or pattern · CPC title