BATTERY CONTROL DEVICE, POWER STORAGE DEVICE, POWER STORAGE METHOD, AND PROGRAM

• US 20150318726A1
• Filed: 11/01/2013
• Published: 11/05/2015
• Est. Priority Date: 11/09/2012
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: TAKAHASHI, Shingo, LUO, Yuan, OHHATA, Shinya, KOGURE, Junji, YOSHIDA, Nobuhide, ITABASHI, Noriyuki
• Granted Patent: US 9,735,596 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 10/482 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H02J 7/0013 acting upon several batteries simultaneously or sequentially H02J7/1423 takes precedence
• CPC Class Codes: H02J 7/0047 with monitoring or indicating devices or circuits
• CPC Class Codes: H02J 7/0048 Detection of remaining charge capacity or state of charge [SOC]
• CPC Class Codes: H02J 7/0049 Detection of fully charged condition
• CPC Class Codes: H02J 7/005 Detection of state of health [SOH]
• CPC Class Codes: H02J 7/007 Regulation of charging or discharging current or voltage
• CPC Class Codes: H02J 7/00714 in response to battery charging or discharging current
• CPC Class Codes: H02J 7/00718 in response to charge current gradient
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A battery control device (100) includes: a measurement unit (110) that individually measures an amount of discharging current of a discharging secondary battery among a plurality of secondary batteries which are independently charged and discharged; a time calculating unit (120) that calculates time required until the secondary battery has a constant battery capacity for each of the discharging secondary batteries on the basis of a discharging current rate for each of the secondary batteries which is calculated on the basis of the amount of discharging current, and an SOC of the secondary battery; a number calculating unit (130) that calculates an expected number of the secondary batteries, which become fully charged in the required time, on the basis of a charging current rate for each of the secondary batteries which is calculated on the basis of an amount of charging current of the charging secondary battery, an SOC of the secondary battery, and the required time, and calculates a total value of the expected number and the existing number of secondary batteries which are already fully charged; and a control unit (140) that determines whether or not to raise the charging current rate on the basis of the total value.

Claims

1. A battery control device, comprising:

a measurement unit that individually measures an amount of discharging current of a discharging secondary battery among a plurality of secondary batteries which are independently charged and discharged;

a time calculating unit that calculates time required until the secondary battery has a constant battery capacity for each of the discharging secondary batteries on the basis of a discharging current rate for each of the secondary batteries which is calculated on the basis of the amount of discharging current, and a state of charge (SOC) of the secondary battery;

a number calculating unit that calculates an expected number of the secondary batteries, which become fully charged in the required time, on the basis of a charging current rate for each of the secondary batteries which is calculated on the basis of an amount of charging current of the charging secondary battery, the SOC of the secondary battery, and the required time, and calculates a total value of the expected number and the existing number of secondary batteries which are already fully charged; and

a control unit that determines whether or not to raise the charging current rate on the basis of the total value.

2. The battery control device according to claim 1,

wherein the control unit raises the charging current rate of the charging secondary batteries which do not become fully charged in the required time in order from a secondary battery that is closest to full charge.

3. The battery control device according to claim 1,

wherein the control unit raises the charging current rate by an increment width of two or more times.

4. The battery control device according to claim 1,

wherein the control unit lowers the charging current rate on the basis of a charging completion time for each of the charging secondary batteries, and the required time.

5. The battery control device according to claim 1,

wherein the control unit raises the charging current rate of the charging secondary batteries which do not become fully charged in the required time in order from a secondary battery that is closest to full charge

6. The battery control device according to claim 5,

wherein the specific group is classified on the basis of a state of health (SOH) of each of the plurality of secondary batteries.

7. The battery control device according to claim 1,

wherein the number calculating unit weights the expected number and the existing number on the basis of the SOH for each of the plurality of secondary batteries.

8. A power storage device, comprising:

a plurality of secondary batteries which are independently charged and discharged;

a measurement unit that individually measures an amount of discharging current of each of the discharging secondary batteries;

a time calculating unit that calculates time required until the secondary battery has a constant battery capacity for each of the discharging secondary batteries on the basis of a discharging current rate for each of the secondary batteries which is calculated on the basis of the amount of discharging current, and a state of charge (SOC) of the secondary battery;

a number calculating unit that calculates an expected number of the secondary batteries, which become fully charged in the required time, on the basis of a charging current rate for each of the secondary batteries which is calculated on the basis of an amount of charging current of the charging secondary battery, the SOC of the secondary battery, and the required time, and calculates a total value of the expected number and the existing number of secondary batteries which are already fully charged; and

a control unit that determines whether or not to raise the charging current rate on the basis of the total value.

9. A power storage method, comprising allowing a computer to:

individually measure an amount of discharging current of a discharging secondary battery among a plurality of secondary batteries which are independently charged and discharged;

calculate time required until the secondary battery has a constant battery capacity for each of the discharging secondary batteries on the basis of a discharging current rate for each of the secondary batteries which is calculated on the basis of the amount of discharging current, and a state of charge (SOC) of the secondary battery;

calculate an expected number of the secondary batteries, which become fully charged in the required time, on the basis of a charging current rate for each of the secondary batteries which is calculated on the basis of an amount of charging current of the charging secondary battery, the SOC of the secondary battery, and the required time, and calculate a total value of the expected number and the existing number of secondary batteries which are already fully charged; and

determine whether or not to raise the charging current rate on the basis of the total value.

10. A non-transitory computer readable medium storing a program, the program that allows a computer to function as:

a measurement unit that individually measures an amount of discharging current of a discharging secondary battery among a plurality of secondary batteries which are independently charged and discharged;

a time calculating unit that calculates time required until the secondary battery has a constant battery capacity for each of the discharging secondary batteries on the basis of a discharging current rate for each of the secondary batteries which is calculated on the basis of the amount of discharging current, and a state of charge (SOC) of the secondary battery;

a number calculating unit that calculates an expected number of the secondary batteries, which become fully charged in the required time, on the basis of a charging current rate for each of the secondary batteries which is calculated on the basis of an amount of charging current of the charging secondary battery, the SOC of the secondary battery, and the required time, and calculates a total value of the expected number and the existing number of secondary batteries which are already fully charged; and

a control unit that determines whether or not to raise the charging current rate on the basis of the total value.