WO-2026094520-A1 - PRECOATED METAL PLATE AND METHOD FOR PRODUCING PRECOATED METHAL PLATE

WO2026094520A1WO 2026094520 A1WO2026094520 A1WO 2026094520A1WO-2026094520-A1

Abstract

Provided is a precoated metal plate (1), in which a second exposed part (30B) is disposed directly behind a first exposed part (30A), and a first length (L1) of the first exposed part (30A) from an end surface (15) of a metal substrate (10) to an edge part (21A) of a first coating film part (20A) is equal to or greater than a second length (L2) of a second exposed part (30B) from the end surface (15) of the metal substrate (10) to an edge part (21B) of a second coating film part (20B) disposed directly behind the first exposed part (30A).

Inventors

ENDO YUTA
UCHIDA KENTARO
YOSHIDA RYO
TAKEMURA YOSHINORI

Assignees

日本軽金属株式会社

Dates

Publication Date: 20260507
Application Date: 20250930
Priority Date: 20241028

Claims (11)

A plate-shaped metal substrate, A first coating portion is provided on one of the metal substrate surfaces, which is the first surface, and includes a first resin coating. A second coating portion is provided on the second surface of the metal substrate, which is the surface opposite to the first surface, and includes a second resin coating. Equipped with, A first exposed portion is provided on at least a part of the peripheral edge of the first surface of the metal substrate, extending from the edge of the first coating portion to the end face of the metal substrate. A second exposed portion is provided on at least a part of the peripheral edge of the second surface of the metal substrate, extending from the edge of the second coating portion to the end face of the metal substrate. The second exposed portion is positioned directly behind the first exposed portion. A pre-coated metal sheet, wherein the first length of the first exposed portion from the end face of the metal substrate to the edge of the first coating portion is greater than or equal to the second length of the second exposed portion from the end face of the metal substrate to the edge of the second coating portion located directly behind the first exposed portion.
The pre-coated metal sheet according to claim 1, wherein the first length is greater than the second length.
The pre-coated metal sheet according to claim 1 or 2, wherein the first length and the second length are 1 mm or more and 10 mm or less.
The pre-coated metal sheet according to any one of claims 1 to 3, wherein the second length is 0.5 times or more and 1 time or less than the first length.
The pre-coated metal sheet according to any one of claims 1 to 4, wherein the thickness of the metal substrate is 0.1 mm or more and 10 mm or less.
The pre-coated metal sheet according to any one of claims 1 to 5, wherein the film thickness of the first resin coating and the second resin coating is 5 μm or more and 1000 μm or less.
The first resin coating and the second resin coating are insulating. The pre-coated metal plate is a pre-coated metal plate for a battery container, according to any one of claims 1 to 6.
A plate-shaped metal substrate, A first coating portion is provided on one of the metal substrate surfaces, which is the first surface, and includes a first resin coating. A second coating portion is provided on the second surface of the metal substrate, which is the surface opposite to the first surface, and includes a second resin coating. A method for manufacturing a pre-coated metal sheet, comprising: The method for manufacturing the pre-coated metal sheet is as follows: A first painting step involves applying a first paint to the first surface of the metal substrate to form a first coating portion including a first resin film, and forming a first exposed portion on the peripheral edge of the metal substrate in contact with the first coating portion. A second painting step involves applying a second paint to the second surface of the metal substrate to form a second coating portion including the second resin film, and forming a second exposed portion on the peripheral edge of the metal substrate in contact with the second coating portion. Equipped with, In the first coating step, the first coating portion and the first exposed portion are formed such that the first exposed portion, which is exposed from the edge of the first coating portion to the end face of the metal substrate, is provided on at least a part of the peripheral edge of the first surface of the metal substrate. In the second coating step, a second exposed portion is provided on at least a part of the peripheral edge of the second surface of the metal substrate, extending from the edge of the second coating portion to the end face of the metal substrate, and the second coating portion and the second exposed portion are formed such that the second exposed portion is positioned directly behind the first exposed portion. A method for manufacturing a pre-coated metal sheet, comprising the steps of first and second coating, wherein the first coating is applied such that the first length of the first exposed portion from the end face of the metal substrate to the edge of the first coating portion is equal to or greater than the second length of the second exposed portion from the end face of the metal substrate to the edge of the second coating portion.
The method for manufacturing a pre-coated metal sheet according to claim 8, wherein the first length is greater than the second length.
The method for manufacturing a pre-coated metal sheet according to claim 8 or 9, wherein the first length and the second length are 1 mm or more and 10 mm or less.
The method for manufacturing a pre-coated metal sheet according to any one of claims 8 to 10, wherein the second length is 0.5 times or more and 1 time or less than the first length.

Description

Pre-coated metal sheet and method for manufacturing a pre-coated metal sheet This disclosure relates to a pre-coated metal sheet and a method for manufacturing a pre-coated metal sheet. The container is manufactured by forming a cylindrical body from a metal substrate through molding processes, and then joining the container body to a lid and bottom plate. For battery containers, those with a resin coating on the surface are used. Applying a resin coating to the surface of the container enhances its insulation and corrosion resistance. However, if a resin coating is present on the surface of a metal substrate when attempting to perform a joint, the resin coating at the joint may cause welding defects. Furthermore, welding may cause thermal decomposition of the resin coating, potentially impairing its insulation and corrosion resistance around the joint. Patent Document 1 describes a method for manufacturing an energy storage element. In the method described in Patent Document 1, an insulating coating is applied to the outer surfaces of the molded container body and lid to form an insulating film. Then, the insulating film on the outer surfaces of the container body and lid is removed by irradiating it with laser light. After exposing the metal surfaces of the container body and lid, the metal surfaces of both are joined together. While Patent Document 1 allows for the manufacture of a container by joining the exposed metal surfaces, it requires a step to remove the insulating film at the joint, resulting in reduced production efficiency. Patent Document 2 describes a laminated composite container comprising an aluminum lid material with a synthetic resin layer on its inner surface and an aluminum composite container body with a synthetic resin layer on its inner surface. Patent Document 2 describes the manufacturing of the laminated composite container by joining the aluminum materials together and the synthetic resin layers together. It also describes manufacturing the composite container body by molding after applying a synthetic resin layer to the aluminum material, making the layer smaller than the aluminum joint area. Furthermore, it describes overlapping the composite container body and the lid material so that the aluminum materials are in contact with each other, and joining the aluminum materials at the aluminum joint area. Patent Document 2 describes a method for manufacturing a container with a corrosion-resistant resin coating, in which an aluminum material (pre-coated metal sheet) with exposed metal portions, where the resin coating is not present, is manufactured in advance. By joining a lid material formed from such a pre-coated metal sheet with exposed metal portions to the composite container body, the step of removing the resin coating from the joining area before joining the container is eliminated. In Patent Document 2, a metal exposed portion and a resin coating are formed on the inner surfaces of both the lid material and the composite container body. The lid material is placed on the composite container body so that the aluminum materials of the two aluminum joints overlap, and the joints are then joined. In Patent Document 2, the resin coating on the inner surface of the container provides corrosion resistance to the aluminum material. As containers are used in a variety of applications, there is a growing demand for containers with high functionality, and the production of containers with resin coatings on both the inner and outer surfaces is increasing. This disclosure has been made in view of the problems of the prior art described above. The purpose of this disclosure is to provide a pre-coated metal sheet and a method for manufacturing a pre-coated metal sheet that can protect both sides of a metal substrate and improve the productivity of a bonded assembly formed by joining pre-coated metal sheets. A pre-coated metal sheet according to a first aspect of this disclosure comprises a plate-shaped metal substrate, a first coating portion including a first resin coating provided on a first surface (one side of the metal substrate), and a second coating portion including a second resin coating provided on a second surface (the side of the metal substrate opposite to the first surface). A first exposed portion, where the metal substrate is exposed from the edge of the first coating portion to the end face of the metal substrate, is provided on at least a portion of the peripheral edge of the first surface of the metal substrate. A second exposed portion, where the metal substrate is exposed from the edge of the second coating portion to the end face of the metal substrate, is provided on at least a portion of the peripheral edge of the second surface of the metal substrate. The second exposed portion is located directly behind the first exposed portion. The first length of the first exposed portion, from the end face of the metal substrate to the edge of the first coating portion, is