SECONDARY BATTERY SYSTEM WITH PLURAL BATTERIES AND METHOD OF DISTRIBUTING CHARGE/DISCHARGE POWER, ETC.

• US 20160013670A1
• Filed: 03/03/2014
• Published: 01/14/2016
• Est. Priority Date: 03/04/2013
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: TOHARA, Masahiro, SAMEDA, Yoshito, MIZUTANI, Mami, ENDO, Tamotsu
• Granted Patent: US 9,825,474 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01M 10/441 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: 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
• CPC Class Codes: H02J 5/00 Circuit arrangements for transfer of electric power between ac networks and dc networks H02J3/36 takes precedence
• CPC Class Codes: H02J 7/0013 acting upon several batteries simultaneously or sequentially H02J7/1423 takes precedence
• CPC Class Codes: H02J 7/0019 using switched or multiplexed charge circuits
• CPC Class Codes: H02J 7/0048 Detection of remaining charge capacity or state of charge [SOC]
• CPC Class Codes: H02J 7/005 Detection of state of health [SOH]
• CPC Class Codes: H02J 7/00714 in response to battery charging or discharging current
• CPC Class Codes: H02J 7/02 for charging batteries from ac mains by converters
• CPC Class Codes: Y02B 40/00 Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors

Abstract

A secondary battery system including plural batteries, extends the lifetime of each battery, and improves the charge/discharge (energy) efficiency of a whole system is provided. A secondary battery system includes plural batteries individually controllable for charging/discharging, plural PCSs each connected to the corresponding battery and performing charging/discharging to the connected battery, and a battery controller distributing a charge/discharge power value as a whole system to each of the PCSs at a fixed cycle or an arbitrary timing. The battery controller includes a preference order calculator setting a preference order to the plural batteries at each time point based on a deterioration characteristic of each battery related to each SOC thereof, and a distribution rate determining unit distributing the charge/discharge power value to the PCSs in accordance with the preference order.

Claims

1. A secondary battery system comprising:

a plurality of batteries individually controllable for charging/discharging;

a plurality of charging/discharging devices each connected with the corresponding battery, and performing charging/discharging to the connected battery; and

a battery controller distributing, to each of the charging/discharging devices, a charge/discharge power value or a current value as a whole system at a fixed cycle or at an arbitrary timing,

the battery controller comprising;

a preference order calculator setting a preference order to the plurality of batteries at each time point based on a deterioration characteristic of each battery related to an SOC thereof; and

a distribution rate determiner distributing the charge/discharge power value or the current value to the charging/discharging devices in accordance with the preference order.

2. The secondary battery system including the plurality of batteries according to claim 1, wherein the battery controller further comprises a charge-necessity-value calculator calculating a charge necessity value based on a charge necessity characteristic, the charge necessity characteristic being on a basis of a deterioration speed of the battery relative to the SOC thereof at the time point, and the deterioration speed being the deterioration characteristic of each battery.

3. A method of distributing charge/discharge power, etc., comprises:

a plurality of batteries individually controllable for charging/discharging;

a plurality of charging/discharging devices each connected with the corresponding battery, and performing charging/discharging to the connected battery; and

a battery controller distributing, to each of the charging/discharging devices, a charge/discharge power value or a current value as a whole system at a fixed cycle or at an arbitrary timing,

wherein the battery controller sets a preference order to the plurality of batteries at each time point based on a deterioration characteristic of each battery related to an SOC thereof, and to distribute the charge/discharge power value or the current value to the charging/discharging devices in accordance with the preference order.

4. The charge/discharge power, etc., distribution method according to claim 3 wherein a charge necessity characteristic based on a deterioration speed of the battery relative to the SOC thereof at the time point is applied as the deterioration characteristic of each battery.

5. The charge/discharge power, etc., distribution method according to claim 3, wherein a charge necessity characteristic based on a deterioration speed relative to the SOC of each battery and a temperature thereof at the time point is applied as the deterioration characteristic of each battery.

6. The charge/discharge power, etc., distribution method according to claim 4, wherein a characteristic value proportional to a derivative value of a deterioration speed characteristic of the battery relative to the SOC thereof is applied as the charge necessity characteristic of each battery.

7. The charge/discharge power, etc., distribution method according to claim 3, wherein in the distribution of the charge/discharge power value to the respective charging/discharging devices in accordance with the preference order, the charge/discharge power value is distributed to the respective charging/discharging devices based on an efficiency characteristic to charge/discharge power of the battery and the charging/discharging device.

8. The charge/discharge power, etc., distribution method according to claim 7, wherein in the distribution of the charge/discharge power value to the respective charging/discharging devices in accordance with the preference order, when a total value of maximum chargeable/dischargeable power values (MPP) of all batteries is equal to or smaller than a charge/discharge instruction value of a whole system at the time point, the respective maximum chargeable/dischargeable power values (MPP) are distributed to all batteries.

9. The charge/discharge power, etc., distribution method according to claim 7, wherein in the distribution of the charge/discharge power value to the respective charging/discharging devices in accordance with the preference order, when a charge/discharge instruction value of a whole system at the time point is smaller than a total value of maximum chargeable/dischargeable power values (MPP) of all batteries, and is equal to or larger than a total value of maximum efficiency point power values (MEP) of all batteries, the respective MEPs are once distributed to all chargeable/dischargeable batteries, and a remaining not distributed yet is additionally distributed to each battery having already undergone the distribution at a rate of remaining amount (MPP−

MEP).

10. The charge/discharge power, etc., distribution method according to claim 7, wherein in the distribution of the charge/discharge power value to the respective charging/discharging devices in accordance with the preference order, when a charge/discharge instruction value of a whole system at the time point is smaller than a total value of maximum efficiency point power values (MEP) of all batteries, the distribution is performed to the chargeable/dischargeable batteries in an order of the higher preference at a rate of MEP, the number of the chargeable/dischargeable batteries making a ratio between distributed power and the MEP closest to 1,

11. The charge/discharge power, etc., distribution method according to claim 3, wherein, as a result of the charge/discharge power distribution, the battery that has zero distribution amount is transitioned to a power saving mode that has a smaller power consumption than at a time of performing charging/discharging.

12. The charge/discharge power, etc., distribution method according to claim 5, wherein a characteristic value proportional to a derivative value of a deterioration speed characteristic of the battery relative to the SOC thereof is applied as the charge necessity characteristic of each battery.

13. The charge/discharge power, etc., distribution method according to claim 8, wherein in the distribution of the charge/discharge power value to the respective charging/discharging devices in accordance with the preference order, when a charge/discharge instruction value of a whole system at the time point is smaller than a total value of maximum chargeable/dischargeable power values (MPP) of all batteries, and is equal to or larger than a total value of maximum efficiency point power values (MEP) of all batteries, the respective MEPs are once distributed to all chargeable/dischargeable batteries, and a remaining not distributed yet is additionally distributed to each battery having already undergone the distribution at a rate of remaining amount (MPP−

MEP).