Manufacturing method of compressed strip-shaped electrode plate

Patent metadata

Field	Value
Publication number	US-11469406-B2
Application number	US-202117192080-A
Country	US
Kind code	B2
Filing date	Mar 4, 2021
Priority date	Apr 24, 2020
Publication date	Oct 11, 2022
Grant date	Oct 11, 2022

Abstract

This manufacturing method is a method of manufacturing a compressed strip-shaped electrode plate. The method includes: a preliminary compression step of forming a pre-compressed strip-shaped electrode plate by roll-pressing an uncompressed strip-shaped electrode plate in which an uncompressed active material layer that is not yet compressed is formed on a current collector foil; an attraction and removal step of attracting and removing fine particles of active material particles from near a surface of a pre-compressed active material layer by an attracting magnet that is disposed so as to be separated from the pre-compressed active material layer in a thickness direction; and a main compression step of obtaining the compressed strip-shaped electrode plate by roll-pressing a particle-removed strip-shaped electrode plate from which the fine particles have been removed.

First claim

What is claimed is:

1. A manufacturing method of a compressed strip-shaped electrode plate including:
a strip-shaped current collector foil; and
a compressed active material layer that contains active material particles that are attracted to a magnet, and a binding agent, and is formed on the current collector foil and compressed in a thickness direction of the current collector foil,
the manufacturing method comprising:
a drying step of drying an active material layer onto the current collector foil before a preliminary compression step;
the preliminary compression step of forming a pre-compressed strip-shaped electrode plate by roll-pressing, using first press rolls, an uncompressed strip-shaped electrode plate in which an uncompressed active material layer that is not yet compressed is formed on the current collector foil;
an attraction and removal step of attracting and removing fine particles of the active material particles from near a surface of a pre-compressed active material layer of the pre-compressed strip-shaped electrode plate by an attracting magnet that is disposed so as to be separated from the pre-compressed active material layer in the thickness direction; and
a main compression step of obtaining the compressed strip-shaped electrode plate by roll-pressing, using second press rolls, a particle-removed strip-shaped electrode plate from which the fine particles have been removed in the attraction and removal step.

2. The manufacturing method of a compressed strip-shaped electrode plate according to claim 1 , wherein the preliminary compression step uses, as the first press rolls, magnet rolls with magnetic fields generated in surfaces of the magnet rolls.

3. The manufacturing method of a compressed strip-shaped electrode plate according to claim 1 , wherein the preliminary compression step uses the first press rolls that have a smaller diameter than the second press rolls.

4. The manufacturing method of a compressed strip-shaped electrode plate according to claim 1 , wherein a preliminary load that is applied to the uncompressed active material layer using the first press rolls in the preliminary compression step is set to be smaller than a main load that is applied to the particle-removed active material layer using the second press rolls in the main compression step.

Assignees

• Toyota Motor Co Ltd

Inventors

• Kishimoto Tetsuro

Classifications

• B30B3/00

  Presses characterised by the use of rotary pressing members, e.g. rollers, rings, discs · CPC title

• B05D3/12

  by mechanical means · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/8896

  Pressing, rolling, calendering (membrane electrode assemblies H01M8/1004) · CPC title

• H01M4/1391

  of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title