# US 8,570,695 B2 · Battery system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,570,695 B2 - Document ID: US8570695B2 - Status: Granted - Kind: B2 - Application number: 12/921,204 - Filed: 2009-03-05 - Published: 2011-06-23 - Granted: 2013-10-29 - Earliest claimed: 2008-03-07 - Assignees: Kabushiki Kaisha Toshiba - Applicants: Nobuo Shibuya; Kazuhide Ashida; Ryuichi Morikawa; Shinichiro Kosugi - Inventors: Nobuo Shibuya; Kazuhide Ashida; Ryuichi Morikawa; Shinichiro Kosugi - Web page: https://patentgrep.com/patent/US8570695B2 ## CPC - H01M 10/425: {Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00)} - 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) - H01M 50/583: in response to current, e.g. fuses - H02J 7/50: acting upon multiple batteries simultaneously or sequentially - H02J 7/64: against overvoltage - H02J 7/80: including monitoring or indicating arrangements - G01R 31/396: Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery - H01M 2200/00: Safety devices for primary or secondary batteries - H01M 2200/103: Fuse - H02J 7/62: against overcurrent - Y02E 60/10: Energy storage using batteries - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract Provided is a battery system capable of preventing the voltage that is applied to the voltage detection circuit from exceeding the withstand voltage of the voltage detection circuit when the connection between the cells in the battery module is disconnected, and preventing an overcurrent from flowing in the cell voltage detection circuit and the module. The modules are internally provided with a battery voltage measurement circuit 2 for measuring the voltage of each cell. A reverse voltage protective diode 3 is disposed in the power supply route of the battery voltage measurement circuit 2, and adapted such that the anode thereof is connected to the negative electrode of a drive power source of the voltage measurement circuit and the cathode thereof is connected to the positive electrode of the drive power source of the voltage measurement circuit. A fuse 4 as an overcurrent protective element is provided to the power supply route of the battery voltage measurement circuit 2. ## Claims ### Claim 1 A battery system in which one or more modules are connected in series, wherein each of the modules comprises: a plurality of batteries connected in series; a voltage measurement circuit for measuring a voltage of each of the batteries; an overcurrent protection unit connected to the voltage measurement circuit; a reverse voltage protective diode in which the cathode thereof is connected to the positive electrode of a drive power source of the voltage measurement circuit and the anode thereof is connected to the negative electrode of the drive power source of the voltage measurement circuit; and a resistor for preventing a short circuit, which is disposed on a voltage detection line between each of the batteries and the voltage measurement circuit. ### Claim 2 A battery system in which one or more modules are connected in series, wherein each of the modules comprises: a plurality of batteries connected in series; a voltage measurement circuit for measuring a voltage of each of the batteries; an overcurrent protection unit connected to the voltage measurement circuit; an overvoltage protective zener diode in which the cathode thereof is connected to the positive electrode of a drive power source of the voltage measurement circuit and the anode thereof is connected to the negative electrode of the drive power source of the voltage measurement circuit; and a resistor for preventing a short circuit, which is disposed on a voltage detection line between each of the batteries and the voltage measurement circuit. ### Claim 3 A battery system in which one or more modules are connected in series, wherein each of the modules comprises: a plurality of batteries connected in series; a voltage measurement circuit for measuring a voltage of each of the batteries; an overcurrent protection unit connected to the voltage measurement circuit; a metal oxide varistor in which the terminations thereof are respectively connected to the positive electrode and the negative electrode of a drive power source of the voltage measurement circuit; and a resistor for preventing a short circuit, which is disposed on a voltage detection line between each of the batteries and the voltage measurement circuit. ### Claim 4 (depends on 1, 2, 3) The battery system according to any one of claims 1 to 3, wherein: the overcurrent protection unit is configured from a fuse. ### Claim 5 (depends on 1, 2, 3) The battery system according to any one of claims 1 to 3, wherein: the overcurrent protection unit is configured from a self-recovering type overcurrent protective element. ### Claim 6 (depends on 1, 2, 3) The battery system according to any one of claims 1 to 3, wherein: the overcurrent protection unit is configured from a diode, and the forward direction of the diode is a direction in which an overcurrent is blocked. ### Claim 7 (depends on 6) The battery system according to claim 6, wherein each of the modules further comprises: a resistor connected in parallel to the diode. ### Claim 8 A battery system in which one or more modules are connected in series, wherein each of the modules comprises: a plurality of batteries connected in series; a voltage measurement circuit for measuring a voltage of each of the batteries; an overcurrent protective element connected to the voltage measurement circuit; a diode connected in series to the overcurrent protective element, the forward direction thereof being a direction in which an overcurrent is blocked; a resistor connected in parallel to the diode; an overvoltage protective zener diode in which the cathode thereof is connected to the positive electrode of a drive power source of the voltage measurement circuit and the anode thereof is connected to the negative electrode of the drive power source of the voltage measurement circuit; and a resistor for preventing a short circuit, which is disposed on a voltage detection line between each of the batteries and the voltage measurement circuit. ### Claim 9 A battery system in which one or more modules are connected in series, wherein each of the modules comprises: a plurality of batteries connected in series; a voltage measurement circuit for measuring a voltage of each of the batteries; an overcurrent protective element connected to the voltage measurement circuit; a diode connected in series to the overcurrent protective element, the forward direction thereof being a direction in which an overcurrent is blocked; a resistor connected in parallel to the diode; a metal oxide varistor in which the terminations thereof are respectively connected to the positive electrode and the negative electrode of a drive power source of the voltage measurement circuit; and a resistor for preventing a short circuit, which is disposed on a voltage detection line between each of the batteries and the voltage measurement circuit. ### Claim 10 (depends on 8, 9) The battery system according to claim 8 or 9, wherein: the overcurrent protective element is configured from a fuse. ### Claim 11 (depends on 8, 9) The battery system according to claim 8 or 9, wherein: the overcurrent protective element is of a self-recovering type.