# US 12,183,875 B2 · Sealed battery and assembled battery

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,183,875 B2
- Document ID: US12183875B2
- Status: Granted
- Kind: B2
- Application number: 18/398,445
- Filed: 2023-12-28
- Published: 2024-04-18
- Granted: 2024-12-31
- Earliest claimed: 2019-02-28
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Tsuyoshi Ehara; Yoshinori Shibata
- Web page: https://patentgrep.com/patent/US12183875B2

## CPC

- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 50/209: adapted for prismatic or rectangular cells (H01M50/216 takes precedence)
- H01M 50/503: characterised by the shape of the interconnectors
- H01M 50/522: Inorganic material
- H01M 50/534: characterised by the material of the leads or tabs
- H01M 50/536: characterised by the method of fixing the leads to the electrodes, e.g. by welding
- H01M 50/55: on the same side of the cell
- H01M 50/553: Terminals adapted for prismatic, pouch or rectangular cells
- H01M 50/562: characterised by the material
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- Y02E 60/10: Energy storage using batteries
- 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

## Abstract

The present disclosure provides a joining technique capable of improving strength and reducing electrical resistance of a connecting portion that performs heterometal interjunction in a sealed battery. A mode of the sealed battery disclosed herein includes an electrode body, a battery case, a positive electrode internal terminal, a positive electrode external terminal, a negative electrode internal terminal, and a negative electrode external terminal. In the sealed battery, in a connecting portion between the negative electrode internal terminal and the negative electrode external terminal, an upper end of the negative electrode internal terminal and the negative electrode external terminal are stacked with a plated layer interposed therebetween and, at the same time, the negative electrode internal terminal and the negative electrode external terminal are joined to each other via the plated layer. In addition, a rough surface having a plurality of recessed portions is formed on the upper surface of the negative electrode external terminal having been stacked with the plated layer interposed therebetween, and a part of the plated layer penetrates into the recessed portions. Accordingly, a connecting portion having high strength and low resistance can be formed between the negative electrode internal terminal and the negative electrode external terminal.

## Claims

### Claim 1

A method of manufacturing an assembled battery including a plurality of unit cells having an external terminal arranged outside of a battery case and a busbar which connects the external terminal of one unit cell and the external terminal of another unit cell to each other,
each of the plurality of unit cells further including
an electrode body housed inside the battery case, and
an internal terminal which is connected inside the battery case to the electrode body and of which a part is connected outside the battery case to the external terminal,
the method comprising a step of connecting two metal members which are present on a conductive path from the internal terminal of one unit cell to the internal terminal of another unit cell and which are constituted by metal materials that differ from one another, wherein
the step of connecting two metal members includes:
a rough surface forming step of forming a rough surface having a plurality of recessed portions on at least one of a surface of the one metal member and a surface of the other metal member;
a plating-joining step of arranging the two metal members so that the rough surface faces another connection object with a gap between the rough surface and the connection object, forming a plated layer between the two metal members, and joining the two metal members to each other by causing a part of the plated layer to penetrate into the recessed portions, and
the one metal member is an external terminal constituted by a metal material of which a main component is Cu and, at the same time, the other metal member is a busbar constituted by a metal material of which a main component is Al, and
in the rough surface forming step, an alumite layer having a plurality of micropores is formed on a surface of the busbar by performing anodization on the surface of the busbar.