# US 11,444,469 B2 · Management device and power storage system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,444,469 B2 - Document ID: US11444469B2 - Status: Granted - Kind: B2 - Application number: 17/053,103 - Filed: 2019-04-05 - Published: 2021-07-29 - Granted: 2022-09-13 - Earliest claimed: 2018-05-14 - Assignees: Sanyo Electric Co., Ltd. - Applicants: SANYO Electric Co., Ltd. - Inventors: Masato Nakayama; Hidetsugu Mukae; Yousuke Nakagawa; Masanori Ito - Web page: https://patentgrep.com/patent/US11444469B2 ## CPC - H02J 7/54: Passive balancing, e.g. using resistors or parallel MOSFETs - B60L 58/22: Balancing the charge of battery modules - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01M 10/425: {Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00)} - H01M 10/441: {for several batteries or cells simultaneously or sequentially} - 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 10/482: {for several batteries or cells simultaneously or sequentially} - H02J 7/64: against overvoltage - H02J 7/80: including monitoring or indicating arrangements - B60L 2240/547: Voltage - B60L 2240/80: Time limits - H01M 2010/4271: {Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing} - H01M 2010/4278: {Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller} - Y02E 60/10: Energy storage using batteries - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES - 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 In order to improve safety while suppressing a decrease in efficiency of an equalizing process between a plurality of cells, controller executes an equalizing process between a plurality of cells by controlling a plurality of discharge circuits based on voltages of the plurality of cells measured by voltage measurement unit. Anomaly determination circuit determines whether or not the voltage of each of cells measured by voltage measurement unit is within a normal range. Controller includes, for each first cycle, a first discharge suspension period during which the voltages of the plurality of cells are measured without an influence of the equalizing process during execution of the equalizing process between the plurality of cells and includes, for each second cycle longer than the first cycle, a second discharge suspension period during which a determination result according to anomaly determination circuit is fixed. ## Claims ### Claim 1 A management device comprising: a voltage measurement unit that measures voltages of a plurality of cells connected in series; a plurality of discharge circuits each connected in parallel to a respective one of the plurality of cells; an anomaly determination circuit that determines whether or not each of the voltages of the plurality of cells measured by the voltage measurement unit is within a normal range; and a controller that executes an equalizing process between the plurality of cells by controlling the plurality of discharge circuits based on the voltages of the plurality of cells measured by the voltage measurement unit, wherein the controller sets, for each first cycle, a first discharge suspension period during which the voltages of the plurality of cells are measured without an influence of the equalizing process during the execution of the equalizing process between the plurality of cells and sets, for each second cycle longer than the first cycle, a second discharge suspension period during which a determination result according to the anomaly determination circuit is fixed. ### Claim 2 (depends on 1) The management device according to claim 1, wherein the second discharge suspension period is set to be longer than the first discharge suspension period. ### Claim 3 (depends on 1) The management device according to claim 1, wherein the voltage measurement unit includes a first voltage measurement circuit and a second voltage measurement circuit, the first voltage measurement circuit supplies the voltages of the plurality of cells measured by the voltage measurement unit to the controller and the anomaly determination circuit, the discharge circuit is connected to the second voltage measurement circuit, and the second voltage measurement circuit supplies the voltages of the plurality of cells measured by the voltage measurement unit to the controller. ### Claim 4 (depends on 1) The management device according to claim 1, wherein the controller includes a microcomputer, the microcomputer issues an anomaly detection signal to a higher-level control device when at least one of the voltages of the plurality of cells acquired by communication from the voltage measurement unit is out of the normal range, and when at least one of the voltages of the plurality of cells is out of the normal range, after a delay time longer than or equal to a time required for a stop processing by the microcomputer has passed, the anomaly determination circuit executes a hardware stop processing. ### Claim 5 (depends on 1) A power storage system comprising: a plurality of cells connected in series; and the management device according to claim 1, the management device managing the plurality of cells.