Apparatus and method for maintaining charge amount of secondary battery

Patent metadata

Field	Value
Publication number	US-2015288198-A1
Application number	US-201414439495-A
Country	US
Kind code	A1
Filing date	Jan 24, 2014
Priority date	Oct 14, 2013
Publication date	Oct 8, 2015
Grant date	—

Abstract

The present disclosure discloses an apparatus and method for maintaining a charge amount of a secondary battery. The present disclosure reduces a charge amount or increases a discharge amount when a larger charge amount than a required proper charge amount is charged in the secondary battery. Also, the present disclosure reduces a discharge amount or increases a charge amount when a smaller charge amount than a required proper charge amount is charged in the secondary battery. Through this, a proper charge amount may be maintained.

First claim

1 . An apparatus for maintaining a charge amount of a secondary battery, the apparatus comprising:
a sensing unit to measure an electrical characteristic value of the secondary battery; a memory unit to store a charged power amount decrease section and a charged power amount increase section based on the electrical characteristic value of the secondary battery; and a control unit to output a control signal for reducing an amount of power charged in the secondary battery when a state of the secondary battery corresponds to the charged power amount decrease section based on the electrical characteristic value measured by the sensing unit, and to output a control signal for increasing an amount of power charged in the secondary battery when the state of the secondary battery corresponds to the charged power amount increase section based on the electrical characteristic value measured by the sensing unit.

2 . The apparatus for maintaining the charge amount of the secondary battery according to claim 1 , wherein the charged power amount decrease section is a section where the amount of power charged in the secondary battery is beyond a required charge amount maintenance section, and
the charged power amount increase section is a section where the amount of power charged in the secondary battery is below the required charge amount maintenance section.

3 . The apparatus for maintaining the charge amount of the secondary battery according to claim 1 , wherein the sensing unit corresponds to a voltage measurement sensor.

4 . The apparatus for maintaining the charge amount of the secondary battery according to claim 3 , wherein the charged power amount decrease section and the charged power amount increase section are set based on a voltage value of the secondary battery.

5 . The apparatus for maintaining the charge amount of the secondary battery according to claim 3 , wherein the sensing unit further includes a current measurement sensor.

6 . The apparatus for maintaining the charge amount of the secondary battery according to claim 5 , wherein the charged power amount decrease section and the charged power amount increase section are set based on a state of charge (SOC) of the secondary battery.

7 . The apparatus for maintaining the charge amount of the secondary battery according to claim 1 , wherein the control signal for reducing the amount of power charged in the secondary battery is a signal for reducing an amount of charging power supplied to the secondary battery.

8 . The apparatus for maintaining the charge amount of the secondary battery according to claim 1 , wherein the control signal for reducing the amount of power charged in the secondary battery is a signal for increasing an amount of discharging power outputted from the secondary battery.

9 . The apparatus for maintaining the charge amount of the secondary battery according to claim 1 , wherein the control signal for reducing the amount of power charged in the secondary battery is a signal for reducing an amount of charging power supplied to the secondary battery and increasing an amount of discharging power outputted from the secondary battery.

10 . The apparatus for maintaining the charge amount of the secondary battery according to claim 1 , wherein the control signal for increasing the amount of power charged in the secondary battery is a signal for reducing an amount of discharging power outputted from the secondary battery.

11 . The apparatus for maintaining the charge amount of the secondary battery according to claim 1 , wherein the control signal for increasing the amount of power charged in the secondary battery is a signal for increasing an amount of charging power supplied to the secondary battery.

12 . The apparatus for maintaining the charge amount of the secondary battery according to claim 1 , wherein the control signal for increasing the amount of power charged in the secondary battery is a signal for reducing an amount of discharging power outputted from the secondary battery and increasing an amount of charging power supplied to the secondary battery.

13 . The apparatus for maintaining the charge amount of the secondary battery according to claim 2 , wherein the memory unit further stores a charging stop section where the amount of power charged in the secondary battery represents a larger amount of power than the charged power amount decrease section, and
the control unit outputs a control signal for stopping the charge of the secondary battery when the state of the secondary battery corresponds to the charging stop section based on the electrical characteristic value measured by the sensing unit.

14 . The apparatus for maintaining the charge amount of the secondary battery according to claim 2 , wherein the memory unit further stores a discharging stop section where the amount of power charged in the secondary battery represents a smaller amount of power than the charged power amount increase section, and
the control unit outputs a control signal for stopping the discharge of the secondary battery when the state of the secondary battery corresponds to the discharging stop section based on the electrical characteristic value measured by the sensing unit.

15 . The apparatus for maintaining the charge amount of the secondary battery according to claim 2 , wherein when the state of the secondary battery corresponds to the required charge amount maintenance section based on the electrical characteristic value measured by the sensing unit, the control unit calculates an amount of discharging power of the secondary battery using the electrical characteristic value of the secondary battery measured by the sensing unit during discharging of the secondary battery, and outputs a control signal for charging the secondary battery by an amount of charging power obtained as a result of adding an amount of power compensation to the calculated amount of discharging power when charging the secondary battery.

16 - 39 . (canceled)

40 . An energy storage system comprising:
a plurality of secondary batteries; an apparatus for maintaining a charge amount of a secondary battery according to claim 1 ; and a power inverter unit to provide a charging power to the secondary battery or provide a discharging power from the secondary battery to an external, in response to a control signal outputted from the control unit included in the apparatus for maintaining the charge amount of the secondary battery.

41 . A method for maintaining a charge amount of a secondary battery through an apparatus for maintaining the charge amount of the secondary battery including a sensing unit to measure an electrical characteristic value of the secondary battery, a memory unit to store a charged power amount decrease section and a charged power amount increase section based on the electrical characteristic value of the secondary battery, and a control unit to output a control signal for reducing or increasing an amount of power charged in the secondary battery, the method comprising:
(a) receiving, by the control unit, a signal for the electrical characteristic value of the secondary battery from the sensing unit; (b) determining, by the control unit, whether a state of the secondary battery corresponds to the charged power amount decrease section or the charged power amount increase section based on the electrical characteristic value of the secondary battery; and (c) outputting, by the control unit, a control signal for reducing the amount of power charged in the secondary battery when the state of the sec

Assignees

• Lg Chemical Ltd

Inventors

• Cho Young-Bo
• Cho Tae-Shin
• Baek Seoung-Mun
• Chung Dae-Sik

Classifications

• H02J7/875

  Charging or discharging for charge maintenance, battery initiation or rejuvenation · CPC title

• H02J7/92 Primary

  with prioritisation of loads or sources · CPC title

• H02J7/90 Primary

  Regulation of charging or discharging current or voltage · CPC title

• H02J7/0063

  Electricity · mapped topic

• H02J7/0057

  Electricity · mapped topic