# US 2013/0154572 A1 · 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 2013/0154572 A1 - Document ID: US20130154572A1 - Status: Published application - Kind: A1 - Application number: 13/818,336 - Filed: 2011-07-19 - Published: 2013-06-20 - Earliest claimed: 2010-08-24 - Assignees: Suzuki Motor Corporation - Inventors: Satoshi Ito - Web page: https://patentgrep.com/patent/US20130154572A1 ## CPC - B60L 3/0046: {relating to electric energy storage systems, e.g. batteries or capacitors} - B60L 3/04: Cutting off the power supply under fault conditions (protective devices and circuit arrangements in general H01H; H02H) - B60L 7/12: for vehicles propelled by DC motors - B60L 50/52: characterised by DC-motors - B60L 58/13: Maintaining the SoC within a determined range - B60L 58/18: of two or more battery modules - B60L 58/19: Switching between serial connection and parallel connection of battery modules - B60L 58/21: having the same nominal voltage - B60L 58/25: by controlling the electric load - B60L 58/26: by cooling - H01M 10/441: {for several batteries or cells simultaneously or sequentially} - H02J 7/855: {with circuits adapted for supplying loads from the battery} - H02J 7/947: {in response to integrated charge or discharge current} - H02J 7/96: in response to battery voltage - B60L 2200/26: Rail vehicles - B60L 2210/10: DC to DC converters - B60L 2210/30: AC to DC converters - B60L 2240/421: Speed - B60L 2240/423: Torque - B60L 2240/545: Temperature - B60L 2240/547: Voltage - B60L 2240/549: Current - H02J 7/52: for charge balancing, e.g. equalisation of charge between batteries - Y02E 60/10: Energy storage using batteries - Y02T 10/64: Electric machine technologies in electromobility - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - Y02T 10/72: Electric energy management in electromobility - 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 - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract An integration control device of a power storage system obtains pieces of status information of power storage devices from control devices of unit modules, compares the obtained pieces of status information with one another, and performs driving control of an electrical load based on a worst value of the pieces of status information. ## Claims ### Claim 1 A power storage system comprising: a plurality of unit modules connected in parallel, the unit modules each composed of a power storage device and a control device capable of managing a status of the power storage device; an electrical load whose driving is controlled by using powers of the power storage devices; and an integration control device connected to the electrical load and the control devices of the unit modules, wherein the integration control device obtains status information of each of the power storage devices from the control device of each of the unit modules, and compares the obtained pieces of status information with one another to control the driving of the electrical load based on a worst value of the pieces of status information. ### Claim 2 (depends on 1) The power storage system according to claim 1, wherein: the control device of each of the unit modules obtains a current, a voltage, a temperature as the status information of the power storage device, calculates a current limit value and a SOC from the obtained status information, and outputs the obtained status information and the calculated current limit value and SOC to the integration control device; and the integration control device compares the pieces of status information, the current limit values, and the SOCs regarding the unit modules with one another, and based on a worst value thereof, performs limitation control of the driving of the electrical load. ### Claim 3 (depends on 1) The power storage system according to claim 1, wherein: the current limit value calculated by the control device of each of the unit modules includes a discharge current limit value and a charge current limit value of each of the unit modules; and the integration control device performs the control so that an average current equal to a sum of the currents of all the unit modules divided by the number of the unit modules falls between a maximum value among the discharge current limit values in current limitation and a minimum value among the charge current limit values in the current limitation. ### Claim 4 (depends on 1) The power storage system according to claim 1, wherein: the SOC calculated by the control device of each of the unit modules includes a highest SOC and a lowest SOC of each of the unit modules; and the integration control device sets a highest SOC limit value and a lowest SOC limit value of the unit modules in advance, and performs the control so that a maximum value among the highest SOCs of the respective unit modules becomes smaller than the highest SOC limit value and a minimum value among the lowest SOCs of the respective unit modules becomes larger than the lowest SOC limit value.