# US 12,119,440 B2 · Pressure sensitive adhesive sheet for batteries and lithium-ion battery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,119,440 B2 - Document ID: US12119440B2 - Status: Granted - Kind: B2 - Application number: 17/130,694 - Filed: 2020-12-22 - Published: 2021-07-01 - Granted: 2024-10-15 - Earliest claimed: 2019-12-26 - Assignees: Lintec Corporation; Panasonic Holdings Corporation - Applicants: Lintec Corporation; Panasonic Corporation - Inventors: Takeshi Ansai; Yuichi Kurata; Hajime Nishino; Tomoki Shiozaki; Kazuhiro Yoshii - Web page: https://patentgrep.com/patent/US12119440B2 ## CPC - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - C08K 5/0025: {Crosslinking or vulcanising agents; including accelerators} - C08K 5/005: {Stabilisers against oxidation, heat, light, ozone} - C09J 7/20: characterised by their carriers - C09J 7/38: Pressure-sensitive adhesives [PSA] - C09J 133/08: Homopolymers or copolymers of acrylic acid esters - H01M 10/052: Li-accumulators - H01M 50/107: having curved cross-section, e.g. round or elliptic (H01M50/103, H01M50/109, H01M50/11 take precedence) - H01M 50/195: Composite material consisting of a mixture of organic and inorganic materials - H01M 50/198: characterised by physical properties, e.g. adhesiveness or hardness - H01M 50/536: characterised by the method of fixing the leads to the electrodes, e.g. by welding - C08K 2003/3045: {Sulfates} - C08K 2201/003: Additives being defined by their diameter - C08K 2201/005: Additives being defined by their particle size in general - C09J 7/201: {characterised by the release coating composition on the carrier layer} - C09J 2203/33: for batteries or fuel cells - C09J 2301/302: the adhesive being pressure-sensitive, i.e. tacky at temperatures inferior to 30°C - C09J 2301/408: additives as essential feature of the adhesive layer - C09J 2433/00: Presence of (meth)acrylic polymer - 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 - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) - C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H) - 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 A pressure sensitive adhesive sheet for batteries, which includes a base material and a pressure sensitive adhesive layer provided on one surface side of the base material. The pressure sensitive adhesive layer contains inorganic fine particles having a water content of 0.4% or less in a single body. ## Claims ### Claim 1 A lithium-ion battery, comprising: two or more conductors fixed in a state of being in contact with each other inside the battery using a pressure sensitive adhesive sheet that comprises: a base material; and a pressure sensitive adhesive layer provided on one surface side of the base material, the pressure sensitive adhesive layer containing inorganic fine particles having a water content of 0.4% or less in a single body, the inorganic fine particles being sulfate fine particles, the pressure sensitive adhesive layer being formed of a pressure sensitive adhesive composition that consists of: a (meth)acrylic ester polymer (A) that is a polymer obtained by solution polymerization, the (meth)acrylic ester polymer (A) having a weight-average molecular weight of 500,000 or more and 2,500,000 or less, a crosslinker (B), the inorganic fine particles, and at least one additive selected from a tackifier, an antioxidant, a softening agent, and a filler. ### Claim 2 (depends on 1) The lithium-ion battery according to claim 1, wherein the sulfate fine particles are barium sulfate fine particles. ### Claim 3 (depends on 1) The lithium-ion battery according to claim 1, wherein a content of the inorganic fine particles in the pressure sensitive adhesive layer is 5 mass parts or more and 500 mass parts or less with respect to 100 mass parts of a pressure sensitive adhesive component contained in the pressure sensitive adhesive layer. ### Claim 4 (depends on 1) The lithium-ion battery according to claim 1, wherein an average particle diameter of the inorganic fine particles is 0.01 μm or more and 10 μm or less. ### Claim 5 (depends on 1) The lithium-ion battery according to claim 1, wherein the (meth)acrylic ester polymer (A) has a weight-average molecular weight of 750,000 or more and 2,500,000 or less. ### Claim 6 (depends on 1) The lithium-ion battery according to claim 1, wherein an amount of gas generated by heating 1 g of the inorganic fine particles is 0.1 ml/g or more and 30 ml/g or less, the gas being generated from the pressure sensitive adhesive layer of the pressure sensitive adhesive layer, the amount of gas being obtained by heating an aluminum laminated bag containing the pressure sensitive adhesive layer and a prepared liquid, and then dividing the increase in volume of the aluminum laminated bag resulting from such heating by the mass of the inorganic fine particles contained in the pressure sensitive adhesive layer, the prepared liquid being obtained by dissolving lithium hexafluorophosphate (LiPF6) at a concentration of 1 mol/L in a mixed liquid in which ethylene carbonate and diethyl carbonate are mixed at a volume ratio of 1:1.