POWER STORAGE SYSTEM AND POWER SOURCE SYSTEM

• US 20140117756A1
• Filed: 10/24/2013
• Published: 05/01/2014
• Est. Priority Date: 10/30/2012
• Status: Active Grant

• Current Assignee: Hitachi Information & Telecommunication Engineering, Ltd. (Hitachi, Ltd.)
• Original Assignee: Hitachi Information & Telecommunication Engineering, Ltd. (Hitachi, Ltd.)
• Inventors: TAKAHASHI, Fumikazu, TAKAHASHI, Yoshihide, KATSUYAMA, Yusuke, TANIGUCHI, Kimiaki, UCHIDA, Akinori, HAMAOGI, Masahiro, NAGAFUCHI, Susumu
• Granted Patent: US 9,680,303 B2
• Time in Patent Office: Days
• US Class Current: 307/23
• CPC Class Codes: H02J 2300/24 of photovoltaic origin
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: H02J 7/0019 using switched or multiplexed charge circuits
• CPC Class Codes: H02J 7/35 with light sensitive cells
• CPC Class Codes: Y02E 10/56 Power conversion systems, e.g. maximum power point trackers

Abstract

A power storage system is provided with charge switches, discharge switches, a bidirectional DC/DC converter and a power storage system controller connecting all the battery packs to an external circuit to achieve parallel charge and discharge, and the power storage system starts the charge by setting a rated charge current value per one battery pack to Iset and setting the rated charge current value Iset as an initial value of a charge current command value Iref(1), thereafter monitor the charge current of each of the battery packs after elapse of a predetermined time so as to subtract its maximum value Ibmax(1) from the charge current command value Iref(1), and add the rated charge current value Iset to result of subtraction Ierr (Iref(1)−Ibmax(1)) so as to set as a new charge current command value Iref(2) and carry out pre-charge in such a manner as to carry on the charge.

Claims

1. A power storage system comprising a control means for controlling to charge and discharge all the battery packs in parallel while connecting all the battery packs of a plurality of battery packs connected in parallel to an external circuit,

wherein said control means is structured such as to charge so that differences of voltages of all the battery packs are within a predetermined range, by making said all the battery packs in a chargeable state and carrying out pre-charge on the basis of application of electric power supply from said external circuit, and thereafter control to make all the battery packs in a chargeable and dischargeable state in relation to said external circuit.

2. The power storage system according to claim 1, wherein said control means is structured such as to start the charge by setting a rated charge current value per one battery pack to Iset and setting said rated charge current value Iset as an initial value of a charge current command value Iref(1), thereafter monitor the charge current of all the battery packs after elapse of a predetermined time so as to subtract its maximum value Ibmax(1) from said charge current command value Iref(1), and add said rated charge current value Iset to result of subtraction Ierr (Iref(1)−

Ibmax(1)) so as to set as a new charge current command value Iref(2) and carry out control of said pre-charge in such a manner as to carry on the charge.

3. The power storage system according to claim 1, said control means is structured such as to start the charge by setting a rated charge current value per one battery pack to Iset and setting said rated charge current value Iset as an initial value of a charge current command value Iref(1), thereafter monitor the charge current of all the battery packs after elapse of a predetermined time so as to subtract its maximum value Ibmax(1) from said charge current command value Iref(1), and add said rated charge current value Iset to result of subtraction Ierr (Iref(1)−

Ibmax(1)) so as to set as a new charge current command value Iref(2) and carry out control of said pre-charge in such a manner as to carry on the charge,

wherein each of said battery packs is provided with a storage battery, and a charge switch and a discharge switch which are connected in series to said storage battery, and said control means is provided with a bidirectional DC/DC converter which controls the charge and discharge of said battery pack, and a power storage system controller which controls said DC/DC converter, the charge switch and the discharge switch.

4. The power storage system according to claim 1, said control means is structured such as to start the charge by setting a rated charge current value per one battery pack to Iset and setting said rated charge current value Iset as an initial value of a charge current command value Iref(1), thereafter monitor the charge current of all the battery packs after elapse of a predetermined time so as to subtract its maximum value Ibmax(1) from said charge current command value Iref(1), and add said rated charge current value Iset to result of subtraction Ierr (Iref(1)−

Ibmax(1)) so as to set as a new charge current command value Iref(2) and carry out control of said pre-charge in such a manner as to carry on the charge,

each of said battery packs is provided with a storage battery, and a charge switch and a discharge switch which are connected in series to said storage battery, and said control means is provided with a bidirectional DC/DC converter which controls the charge and discharge of said battery pack, and a power storage system controller which controls said DC/DC converter, the charge switch and the discharge switch,

wherein said battery pack is provided with an assembled battery which is formed by connecting a plurality of lithium ion secondary battery cells in series or in parallel.

5. A power storage system comprising a control means for controlling to charge and discharge all the battery packs in parallel while connecting all the battery packs of a plurality of battery packs connected in parallel to an external circuit,

said control means is structured such as to make said all the battery packs in a chargeable state and carrying out pre-charge on the basis of application of electric power supply from said external circuit, and thereafter control to make all the battery packs in a chargeable and dischargeable state in relation to said external circuit.

wherein said pre-charge is structured such as to start the charge by setting a rated charge current value per one battery pack to Iset and setting said rated charge current value Iset as an initial value of a charge current command value Iref(1), thereafter monitor the charge current of all the battery packs after elapse of a predetermined time so as to subtract its maximum value Ibmax(1) from said charge current command value Iref(1), and add said rated charge current value Iset to result of subtraction Ierr (Iref(1)−

Ibmax(1)) so as to set as a new charge current command value Iref(2) and carry out a constant current charge for carrying on the charge, and the pre-charge is finished in the case that the charge current becomes equal to or less than a charge end current value by thereafter carrying out a constant voltage charge.

10. A power source system comprising:

a commercial power source circuit which connects a commercial power source and a load;

a solar light power generation panel;

a series circuit of a DC/DC converter and an inverter for supplying an output of said solar light power generation panel to the commercial power source circuit;

a power source switching circuit which connects said inverter to the commercial power source circuit; and

a power source system controller which controls these elements,

wherein the power storage system according to claim 5 is connected while using a connection portion which connects in series said DC/DC converter and the inverter as an external circuit,

15. A power source system comprising:

a series circuit of an AC/DC converter and a DC/DC converter for supplying an electric power to an information device from a commercial power source, and a power source system controller which controls these elements,

wherein the power storage system according to claim 5 is connected while using a connection portion which connects in series said AC/DC converter and the DC/DC converter as an external circuit.

6. A power source system comprising:

a commercial power source circuit which connects a commercial power source and a load;

a solar light power generation panel;

a series circuit of a DC/DC converter and an inverter for supplying an output of said solar light power generation panel to the commercial power source circuit;

a power source switching circuit which connects said inverter to the commercial power source circuit; and

a power source system controller which controls these elements,

wherein the power storage system is connected while using a connection portion which connects in series said DC/DC converter and the inverter as an external circuit,

a power storage system comprising a control means for controlling to charge and discharge all the battery packs in parallel while connecting all the battery packs of a plurality of battery packs connected in parallel to an external circuit,

said control means is structured such as to charge so that differences of voltages of all the battery packs are within a predetermined range, by making said all the battery packs in a chargeable state and carrying out pre-charge on the basis of application of electric power supply from said external circuit, and thereafter control to make all the battery packs in a chargeable and dischargeable state in relation to said external circuit.

7. The power source system according to claim 6, said control means of the power storage system is structured such as to start the charge by setting a rated charge current value per one battery pack to Iset and setting said rated charge current value Iset as an initial value of a charge current command value Iref(1), thereafter monitor the charge current of all the battery packs after elapse of a predetermined time so as to subtract its maximum value Ibmax(1) from said charge current command value Iref(1), and add said rated charge current value Iset to result of subtraction Ierr (Iref(1)−

Ibmax(1)) so as to set as a new charge current command value Iref(2) and carry out control of said pre-charge in such a manner as to carry on the charge.

8. The power source system according to claim 6, said control means of the power storage system is structured such as to start the charge by setting a rated charge current value per one battery pack to Iset and setting said rated charge current value Iset as an initial value of a charge current command value Iref(1), thereafter monitor the charge current of all the battery packs after elapse of a predetermined time so as to subtract its maximum value Ibmax(1) from said charge current command value Iref(1), and add said rated charge current value Iset to result of subtraction Ierr (Iref(1)−

Ibmax(1)) so as to set as a new charge current command value Iref(2) and carry out control of said pre-charge in such a manner as to carry on the charge,

wherein each of said battery packs according to the power storage system is provided with a storage battery, and a charge switch and a discharge switch which are connected in series to said storage battery, and said control means is provided with a bidirectional DC/DC converter which controls the charge and discharge of said battery pack, and a power storage system controller which controls said DC/DC converter, the charge switch and the discharge switch.

9. The power source system according to claim 6, said control means of the power storage system is structured such as to start the charge by setting a rated charge current value per one battery pack to Iset and setting said rated charge current value Iset as an initial value of a charge current command value Iref(1), thereafter monitor the charge current of all the battery packs after elapse of a predetermined time so as to subtract its maximum value Ibmax(1) from said charge current command value Iref(1), and add said rated charge current value Iset to result of subtraction Ierr (Iref(1)−

Ibmax(1)) so as to set as a new charge current command value Iref(2) and carry out control of said pre-charge in such a manner as to carry on the charge,

wherein each of said battery packs according to the power storage system is provided with a storage battery, and a charge switch and a discharge switch which are connected in series to said storage battery, and said control means is provided with a bidirectional DC/DC converter which controls the charge and discharge of said battery pack, and a power storage system controller which controls said DC/DC converter, the charge switch and the discharge switch,

wherein said battery pack is provided with an assembled battery which is formed by connecting a plurality of lithium ion secondary battery cells in series or in parallel.

11. A power source system comprising:

a series circuit of an AC/DC converter and a DC/DC converter for supplying an electric power to an information device from a commercial power source,

wherein the power storage system is connected while using a connection portion which connects in series said AC/DC converter and the DC/DC converter as an external circuit,

a power storage system comprising a control means for controlling to charge and discharge all the battery packs in parallel while connecting all the battery packs of a plurality of battery packs connected in parallel to an external circuit,

said control means is structured such as to charge so that differences of voltages of all the battery packs are within a predetermined range, by making said all the battery packs in a chargeable state and carrying out pre-charge on the basis of application of electric power supply from said external circuit, and thereafter control to make all the battery packs in a chargeable and dischargeable state in relation to said external circuit.

12. The power source system according to claim 11, wherein said control means of the power storage system is structured such as to start the charge by setting a rated charge current value per one battery pack to Iset and setting said rated charge current value Iset as an initial value of a charge current command value Iref(1), thereafter monitor the charge current of all the battery packs after elapse of a predetermined time so as to subtract its maximum value Ibmax(1) from said charge current command value Iref(1), and add said rated charge current value Iset to result of subtraction Ierr (Iref(1)−

Ibmax(1)) so as to set as a new charge current command value Iref(2) and carry out control of said pre-charge in such a manner as to carry on the charge.

13. The power source system according to claim 11, said control means of the power storage system is structured such as to start the charge by setting a rated charge current value per one battery pack to Iset and setting said rated charge current value Iset as an initial value of a charge current command value Iref(1), thereafter monitor the charge current of all the battery packs after elapse of a predetermined time so as to subtract its maximum value Ibmax(1) from said charge current command value Iref(1), and add said rated charge current value Iset to result of subtraction Ierr (Iref(1)−

Ibmax(1)) so as to set as a new charge current command value Iref(2) and carry out control of said pre-charge in such a manner as to carry on the charge,

wherein each of said battery packs according to the power storage system is provided with a storage battery, and a charge switch and a discharge switch which are connected in series to said storage battery, and said control means is provided with a bidirectional DC/DC converter which controls the charge and discharge of said battery pack, and a power storage system controller which controls said DC/DC converter, the charge switch and the discharge switch.

14. The power source system according to claim 11, said control means of the power storage system is structured such as to start the charge by setting a rated charge current value per one battery pack to Iset and setting said rated charge current value Iset as an initial value of a charge current command value Iref(1), thereafter monitor the charge current of all the battery packs after elapse of a predetermined time so as to subtract its maximum value Ibmax(1) from said charge current command value Iref(1), and add said rated charge current value Iset to result of subtraction Ierr (Iref(1)−

Ibmax(1)) so as to set as a new charge current command value Iref(2) and carry out control of said pre-charge in such a manner as to carry on the charge,

each of said battery packs of the power storage system is provided with a storage battery, and a charge switch and a discharge switch which are connected in series to said storage battery, and said control means is provided with a bidirectional DC/DC converter which controls the charge and discharge of said battery pack, and a power storage system controller which controls said DC/DC converter, the charge switch and the discharge switch,

wherein said battery pack is provided with an assembled battery which is formed by connecting a plurality of lithium ion secondary battery cells in series or in parallel