# US 10,312,494 B2 · Tab lead including surface treatment film with polymer having carboxylic acid anhydride groups, and nonaqueous electrolyte secondary battery using the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,312,494 B2 - Document ID: US10312494B2 - Status: Granted - Kind: B2 - Application number: 15/046,737 - Filed: 2016-02-18 - Published: 2016-08-25 - Granted: 2019-06-04 - Earliest claimed: 2015-02-23 - Assignees: Automotive Energy Supply Corporation - Applicants: Automotive Energy Supply Corporation - Inventors: Masahiro Suguro; Hiromoto Taguchi; Yuji Tanjo - Web page: https://patentgrep.com/patent/US10312494B2 ## CPC - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01M 10/0585: of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators - H01M 50/119: Metals - H01M 50/121: Organic material - H01M 50/124: having a layered structure - H01M 50/133: Thickness - H01M 50/178: for pouch or flexible bag cells - H01M 50/186: characterised by the disposition of the sealing members - H01M 50/193: Organic material - H01M 50/534: characterised by the material of the leads or tabs - H01M 50/548: on opposite sides of the cell - H01M 50/553: Terminals adapted for prismatic, pouch or rectangular cells - Y02E 60/10: Energy storage using batteries - Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product - 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 - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract Provided is a tab lead for a secondary battery including tab lead metal that has an adhesion interface with sealing resin. The adhesion interface is provided with a surface treatment film formed of a material including a polymer with carboxylic acid anhydride groups. Further provided is a nonaqueous electrolyte secondary battery including the tab lead for the secondary battery as a leading terminal of at least one of a positive electrode and a negative electrode. ## Claims ### Claim 1 A tab lead for a secondary battery, comprising tab lead metal, the tab lead metal comprising an adhesion interface with a sealing resin, wherein the adhesion interface is provided with a surface treatment film formed of a polymer with carboxylic acid anhydride groups and carboxylic groups, wherein the polymer is formed by: applying to the tab lead metal a solution consisting essentially of water and a polycarboxylic acid; and heating the tab lead metal with the applied solution to form the polymer with carboxylic acid anhydride groups and carboxylic groups. ### Claim 2 (depends on 1) The tab lead for a secondary battery according to claim 1, wherein the tab lead metal comprises at least one metal selected from nickel, copper, and aluminum. ### Claim 3 (depends on 1) The tab lead for a secondary battery according to claim 1, wherein peak intensity of the carboxylic acid anhydride group is greater than peak intensity of the carboxylic group in a Raman spectroscopic analysis of the surface treatment film. ### Claim 4 (depends on 1) The tab lead for a secondary battery according to claim 1, wherein the polycarboxylic acid is polyacrylic acid, polymethacrylic acid, or a salt thereof. ### Claim 5 (depends on 1) The tab lead for a secondary battery according to claim 1, wherein the polymer is a crosslinked polyacrylic acid. ### Claim 6 (depends on 1) The tab lead for a secondary battery according to claim 1, wherein the polymer is a crosslinked polymethacrylic acid. ### Claim 7 (depends on 1) The tab lead for a secondary battery according to claim 1, wherein the surface treatment film comprises carbon in an amount greater than or equal to 10 μg/cm2 when measured by a high-frequency combustion-infrared absorption method. ### Claim 8 (depends on 1) The tab lead for a secondary battery according to claim 1, wherein the tab lead metal with the applied solution is heated on a hot plate. ### Claim 9 (depends on 1) The tab lead for a secondary battery according to claim 1, wherein the number of the carboxylic acid anhydride groups in the polymer is greater than the number of the carboxylic groups. ### Claim 10 (depends on 9) The tab lead for a secondary battery according to claim 9, wherein peak intensity of the carboxylic acid anhydride group is greater than peak intensity of the carboxylic group in a Raman spectroscopic analysis of the surface treatment film. ### Claim 11 (depends on 9) The tab lead for a secondary battery according to claim 9, wherein the tab lead metal comprises at least one metal selected from nickel, copper, and aluminum. ### Claim 12 (depends on 1) A nonaqueous electrolyte secondary battery comprising the tab lead according to claim 1 as a leading terminal of at least one of a positive electrode and a negative electrode. ### Claim 13 (depends on 12) The nonaqueous electrolyte secondary battery according to claim 12, comprising a package for the secondary battery including a laminated film. ### Claim 14 (depends on 9) A nonaqueous electrolyte secondary battery comprising the tab lead according to claim 9 as a leading terminal of at least one of a positive electrode and a negative electrode. ### Claim 15 (depends on 14) The nonaqueous electrolyte secondary battery according to claim 14, comprising a package for the secondary battery including a laminated film.