Power storage system

• US 9,461,494 B2
• Filed: 07/19/2011
• Issued: 10/04/2016
• Est. Priority Date: 08/24/2010
• Status: Active Grant

• Current Assignee: Suzuki Motor Corporation
• Original Assignee: Suzuki Motor Corporation
• Inventors: Ito, Satoshi
• Primary Examiner(s): LEE, ERIC D
• Application Number:
  US13/818,336
• Publication Number:
  US 20130154572A1
• Time in Patent Office: 1,904 Days
• Field of Search: 320/126
• US Class Current: 1/1
• CPC Class Codes: B60L 2200/26 Rail vehicles
• CPC Class Codes: B60L 2210/10 DC to DC converters
• CPC Class Codes: B60L 2210/30 AC to DC converters
• CPC Class Codes: B60L 2240/421 Speed
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/545 Temperature
• CPC Class Codes: B60L 2240/547 Voltage
• CPC Class Codes: B60L 2240/549 Current
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 3/04 Cutting off the power supply under fault conditions protective devices and circuit arrangements in general H01H; H02H
• CPC Class Codes: B60L 50/52 characterised by DC-motors
• CPC Class Codes: B60L 58/13 Maintaining the SoC within a determined range
• CPC Class Codes: B60L 58/18 of two or more battery modules
• CPC Class Codes: B60L 58/19 Switching between serial connection and parallel connection of battery modules
• CPC Class Codes: B60L 58/21 having the same nominal voltage
• CPC Class Codes: B60L 58/25 by controlling the electric load
• CPC Class Codes: B60L 58/26 by cooling
• CPC Class Codes: B60L 7/12 for vehicles propelled by dc motors
• CPC Class Codes: H01M 10/441 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H02J 7/0014 Circuits for equalisation of charge between batteries
• CPC Class Codes: H02J 7/0063 : with circuits adapted for supplying loads from the battery
• CPC Class Codes: H02J 7/00716 : in response to integrated charge or discharge current
• CPC Class Codes: H02J 7/007182 : in response to battery voltage
• CPC Class Codes: Y02E 60/10 : Energy storage using batteries
• CPC Class Codes: Y02T 10/64 : Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 : Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/72 : Electric energy management in electromobility

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

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 control device of each of the unit modules obtains a current, a voltage, and a temperature as the status information of the power storage device;

wherein a current limit value calculated by the control device of each of the unit modules is based on the status information and includes a discharge current limit value and a charge current limit value of each of the unit modules; and

wherein the integration control device;

compares the obtained pieces of status information with one another and defines a worst value to control the driving of the electrical load,

wherein the worst value is one of the pieces of status information that has the largest deviation degree from a regular range of the pieces of status information, and

wherein the pieces of status information are the current, the voltage, and the temperature, and

further 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.