# US 11,909,055 B2 · Secondary battery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,909,055 B2 - Document ID: US11909055B2 - Status: Granted - Kind: B2 - Application number: 17/277,364 - Filed: 2019-07-22 - Published: 2021-11-18 - Granted: 2024-02-20 - Earliest claimed: 2018-09-25 - Assignees: Panasonic Holdings Corporation - Applicants: Panasonic Corporation - Inventors: Ichiro Murata; Hiroaki Imanishi - Web page: https://patentgrep.com/patent/US11909055B2 ## CPC - H01M 50/186: characterised by the disposition of the sealing members - H01M 50/176: for prismatic or rectangular cells (H01M50/181 takes precedence) - H01M 50/534: characterised by the material of the leads or tabs - 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 50/567: by fixing means, e.g. screws, rivets or bolts - H01M 50/571: Methods or arrangements for affording protection against corrosion; Selection of materials therefor - H01M 50/586: inside the batteries, e.g. incorrect connections of electrodes - H01M 50/593: Spacers; Insulating plates - 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 A secondary battery includes an electrode body that includes a positive and a negative electrode plate, a battery case that has an opening in which the electrode body is accommodated, a sealing body that seals the opening, an internal terminal that is disposed on an inner side of the sealing body and connected to the positive or the negative electrode plate, and an external terminal that is disposed on an outer side of the sealing body and connected to the internal terminal. The external terminal includes a rivet that is formed in such a manner as to extend through the sealing body, and the internal terminal includes a first portion made of a first metal and a second portion made of a second metal. The external terminal is made of the second metal, and the rivet of the external terminal is joined to the second portion of the internal terminal. ## Claims ### Claim 1 A secondary battery comprising: an electrode body that includes a positive electrode plate and a negative electrode plate; a battery case that has an opening and in which the electrode body is accommodated; a sealing body that seals the opening; an internal terminal that is disposed on an inner side of the sealing body and connected to the positive electrode plate or the negative electrode plate; and an external terminal that is disposed on an outer side of the sealing body and connected to the internal terminal, wherein the external terminal includes a rivet that is formed in such a manner as to extend through the sealing body, wherein the internal ter final includes a first portion made of a first metal and a second portion made of a second metal, and wherein the external terminal is made of the second metal, and the rivet of the external terminal is joined to the second portion of the internal terminal. ### Claim 2 (depends on 1) The secondary battery according to claim 1, wherein a portion in which the rivet and the first portion are exposed on the inner side of the sealing body is covered with an insulating member that is resistant to an electrolyte solution. ### Claim 3 (depends on 1) The secondary battery according to claim 1, wherein the internal terminal is connected to the positive electrode plate or the negative electrode plate via a tab that is included in the positive electrode plate or the negative electrode plate and that is made of the first metal. ### Claim 4 (depends on 1) The secondary battery according to claim 1, wherein the external terminal further includes a busbar connection terminal that is connected to the rivet and that is disposed on an outer portion of the sealing body. ### Claim 5 (depends on 1) The secondary battery according to claim 1, wherein one of the internal terminals that is connected to one of the positive electrode plate and the negative electrode plate includes the first portion made of the first metal and the second portion made of the second metal, wherein one of the external terminals that is connected to the one of the internal terminals is made of the second metal and joined to the second portion of the one of the internal terminals at the rivet, wherein another one of the internal terminals that is connected to another one of the positive electrode plate and the negative electrode plate is made of the second metal, and wherein another one of the external terminals that is connected to the other one of the internal terminals is made of the second metal and joined to the other one of the internal terminals at the rivet. ### Claim 6 (depends on 5) The secondary battery according to claim 5, wherein the one of the positive electrode plate and the negative electrode plate is a positive electrode plate, wherein the first metal is made of aluminum or an aluminum alloy, and wherein the second metal is made of copper or a copper alloy. ### Claim 7 (depends on 5) The secondary battery according to claim 5, wherein the other one of the positive electrode plate and the negative electrode plate is a negative electrode plate, wherein the first metal is made of copper or a copper alloy, and wherein the second metal is made of aluminum or an aluminum alloy.