# US 10,312,555 B2 · Deformation detecting sensor for sealed secondary battery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,312,555 B2 - Document ID: US10312555B2 - Status: Granted - Kind: B2 - Application number: 15/123,817 - Filed: 2014-11-27 - Published: 2017-01-19 - Granted: 2019-06-04 - Earliest claimed: 2014-03-31 - Assignees: Toyo Tire Corporation - Applicants: Toyo Tire & Rubber Co., Ltd. - Inventors: Takeshi Fukuda; Junichi Shigeto - Web page: https://patentgrep.com/patent/US10312555B2 ## CPC - H01M 10/48: Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569) - G01R 31/382: Arrangements for monitoring battery or accumulator variables, e.g. SoC - H01F 10/08: characterised by magnetic layers ({H01F10/32 takes precedence } ; applying thin magnetic films to substrates H01F41/14) - H01M 10/482: {for several batteries or cells simultaneously or sequentially} - H01M 50/569: Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals (battery terminal connectors with integrated measuring arrangements G01R31/364) - H01M 50/578: in response to pressure - H01M 2220/30: Batteries in portable systems, e.g. mobile phone, laptop - Y02E 60/10: Energy storage using batteries - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract A deformation detecting sensor for a sealed secondary battery of the present invention is used with a unit cell, battery module, or battery pack of the sealed secondary battery and includes: a magnetic resin layer stuck to the unit cell and/or battery module, the resin layer comprising a matrix composed of a resin component and a magnetic filler dispersed in the matrix; and a magnetic sensor attached to the inside or outside wall of a package case so as to be capable to detect a change of a magnetic field caused by the magnetic layer. The present invention can provide a deformation detecting sensor capable to detect bulging of a sealed secondary battery with higher sensitivity and to exhibit stable detection characteristics. ## Claims ### Claim 1 A deformation detecting sensor for a sealed secondary battery used with a unit cell, battery module and battery pack of the sealed secondary battery, comprising: a magnetic resin layer; and a magnetic sensor; wherein the magnetic resin layer is stuck to the unit cell, the battery module or both; wherein the magnetic resin layer comprises a matrix composed of a resin component and a magnetic filler that is dispersed in the matrix; wherein the magnetic sensor is attached to an inside wall or an outside wall of a package case; wherein the magnetic sensor is capable of detecting a change in magnetic field that is caused by the magnetic resin layer, and wherein the magnetic filler is unevenly distributed in the thickness direction of the magnetic resin layer and the concentration of the magnetic filler is made higher on the magnetic sensor side than on the unit cell side. ### Claim 2 (depends on 1) The deformation detecting sensor for the sealed secondary battery according to claim 1, wherein the resin component is a polyurethane resin or a silicone resin. ### Claim 3 (depends on 2) The deformation detecting sensor for the sealed secondary battery according to claim 2, wherein the resin has a residual hydroxyl group concentration of 0.2-0.9 meq/g. ### Claim 4 (depends on 3) A deformation detecting sensor system for sealed secondary battery comprising: the deformation detecting sensor according to claim 3; and a detection part for detecting a change of a magnetic field caused by a magnetic resin layer. ### Claim 5 (depends on 3) A battery module comprising a plurality of unit cells for sealed secondary battery electrically connected one another, each unit cell comprising a battery body housed in a package case, the battery body comprising a positive electrode, a negative electrode and a separator, wherein the battery module comprises the deformation detecting sensor according to claim 3 attached on the outside surface of at least one unit cell or on the inside or outside surface of the package case of the battery module. ### Claim 6 (depends on 3) The battery module comprises the deformation detecting sensor according to claim 3 attached on the inside or outside surface of the package case of the battery module. ### Claim 7 (depends on 3) The unit cell comprises the deformation detecting sensor according to claim 3 attached on an outer surface of the unit cell. ### Claim 8 (depends on 2) A deformation detecting sensor system for sealed secondary battery comprising: the deformation detecting sensor according to claim 2; and a detection part for detecting a change of a magnetic field caused by a magnetic resin layer. ### Claim 9 (depends on 2) A battery module comprising a plurality of unit cells for sealed secondary battery electrically connected one another, each unit cell comprising a battery body housed in a package case, the battery body comprising a positive electrode, a negative electrode and a separator, wherein the battery module comprises the deformation detecting sensor according to claim 2 attached on the outside surface of at least one unit cell or on the inside or outside surface of the package case of the battery module. ### Claim 10 (depends on 2) The battery module comprises the deformation detecting sensor according to claim 2 attached on the inside or outside surface of the package case of the battery module. ### Claim 11 (depends on 2) The unit cell comprises the deformation detecting sensor according to claim 2 attached on an outer surface of the unit cell. ### Claim 12 (depends on 1) The deformation detecting sensor for the sealed secondary battery according to claim 1, wherein a part to be measured is an outside surface of the unit cell. ### Claim 13 (depends on 12) A deformation detecting sensor system for sealed secondary battery comprising: the deformation detecting sensor according to claim 12; and a detection part for detecting a change of a magnetic field caused by a magnetic resin layer. ### Claim 14 (depends on 12) A battery module comprising a plurality of unit cells for sealed secondary battery electrically connected one another, each unit cell comprising a battery body housed in a package case, the battery body comprising a positive electrode, a negative electrode and a separator, wherein the battery module comprises the deformation detecting sensor according to claim 12 attached on the outside surface of at least one unit cell or on the inside or outside surface of the package case of the battery module. ### Claim 15 (depends on 12) The battery module comprises the deformation detecting sensor according to claim 12 attached on the inside or outside surface of the package case of the battery module. ### Claim 16 (depends on 12) The unit cell comprises the deformation detecting sensor according to claim 12 attached on an outer surface of the unit cell. ### Claim 17 (depends on 1) A deformation detecting sensor system for sealed secondary battery comprising: the deformation detecting sensor according to claim 1; and a detection part for detecting a change of a magnetic field caused by a magnetic resin layer. ### Claim 18 (depends on 1) A battery module comprising a plurality of unit cells for sealed secondary battery electrically connected one another, each unit cell comprising a battery body housed in a package case, the battery body comprising a positive electrode, a negative electrode and a separator, wherein the battery module comprises the deformation detecting sensor according to claim 1 attached on the outside surface of at least one unit cell or on the inside or outside surface of the package case of the battery module. ### Claim 19 (depends on 1) The deformation detecting sensor for the sealed secondary battery according to claim 1, wherein the magnetic filler is selected from the group consisting of a rare earth based filler, an iron based filler, a cobalt based filler, a nickel based filler, an oxide based filler or a combination thereof. ### Claim 20 (depends on 1) The deformation detecting sensor for the sealed secondary battery according to claim 1, wherein the magnetic resin layer has a thickness of 100 μm to 3000 μm. ### Claim 21 (depends on 1) The deformation detecting sensor for the sealed secondary battery according to claim 1, wherein the amount of the magnetic filler resin layer is 1 to 450 parts by weight relative to 100 parts by weight of the resin component. ### Claim 22 (depends on 1) The battery module comprises the deformation detecting sensor according to claim 1 attached on the inside or outside surface of the package case of the battery module. ### Claim 23 (depends on 1) The unit cell comprises the deformation detecting sensor according to claim 1 attached on an outer surface of the unit cell.