Charging-discharging module of energy storage unit and charging-discharging method thereof

Patent metadata

Field	Value
Publication number	US-10630101-B2
Application number	US-201715684985-A
Country	US
Kind code	B2
Filing date	Aug 24, 2017
Priority date	Sep 7, 2016
Publication date	Apr 21, 2020
Grant date	Apr 21, 2020

Abstract

A charging-discharging module of the energy storage unit is provided. The charging-discharging module of the energy storage unit includes a first energy storage unit; a second energy storage unit; a first switching unit electrically connected to a first terminal of the second energy storage unit; a selecting circuit electrically connected to a first terminal of the first energy storage unit and the first switching unit to selectively conduct the first energy storage unit or the second energy storage unit to a system circuit; and a processing unit electrically connected to the first switching unit. A charging and discharging method is also provided.

First claim

What is claimed is:

1. A charging-discharging module of the energy storage unit, comprising:
a first energy storage unit;
a second energy storage unit;
a first switching unit electrically connected to a first terminal of the second energy storage unit;
a selecting circuit electrically connected to a first terminal of the first energy storage unit and the first switching unit to selectively conduct the first energy storage unit or the second energy storage unit to a system circuit;
an input terminal configured to receive an input voltage; and
a charging circuit electrically connected to the selecting circuit and the system circuit to convert the input voltage to a charging voltage; and
a processing unit electrically connected to the first switching unit;
a second switching unit electrically connected between the input terminal and the first terminal of the second energy storage unit;
a third switching unit electrically connected between a second terminal of the second energy storage unit and the first terminal of the first energy storage unit; and
a fourth switching unit electrically connected between the input terminal and the first terminal of the first energy storage unit,
wherein in a normal charge mode, the processing unit is configured to turn on or off the first switching unit to selectively make the first energy storage unit or the second energy storage unit charged with the charging voltage via the selecting circuit,
wherein in a discharge mode, when an across voltage of the first energy storage unit is larger than the across voltage of the second energy storage unit, the processing unit is configured to turn off the first switching unit to allow the first energy storage unit to supply power to the system circuit when the across voltage of the second energy storage unit is larger than the across voltage of the first energy storage unit, the processing unit is configured to turn on the first switching unit to allow the second energy storage unit to supply power to the system circuit,
wherein in a first charge mode, the third switching unit is turned on to make the first energy storage unit and the second energy storage unit in series connection, the second switching unit is turned on to make the first energy storage unit and the second energy storage unit charged with the input voltage via the second switching unit,
wherein in a second charge mode, the processing unit is configured to turn off the third switching unit and turn on the fourth switching unit to make the first energy storage unit charged with the input voltage via the fourth switching unit,
wherein in the second charge mode, the processing unit is configured to turn on the first switching unit to allow the second energy storage unit to supply power to the system circuit via the selecting circuit.

2. The charging-discharging module of the energy storage unit according to claim 1 , wherein the selecting circuit includes:
a sixth switching unit electrically connected between the first energy storage unit and the system circuit;
a seventh switching unit electrically connected between the second energy storage unit and the system circuit; and
a controller electrically connected to the sixth switching unit and the seventh switching unit, in the discharge mode, when the across voltage of the first energy storage unit is larger than the across voltage of the second energy storage unit, the controller is configured to turn on the sixth switching unit and turn off the seventh switching unit; when the across voltage of the second energy storage unit is larger than the across voltage of the first energy storage unit, the controller is configured to turn on the seventh switching unit and turn off the sixth switching unit.

3. The charging-discharging module of the energy storage unit according to claim 1 , wherein in the first charge mode, the selecting circuit is configured to conduct the first energy storage unit to the system circuit to allow the first energy storage unit to supply power to the system circuit.

4. A charging and discharging method, adapted to a charging-discharging module of an energy storage unit, the method comprising:
receiving an input voltage from a charger when the charging-discharging module of the energy storage unit is in a normal charge mode;
converting the input voltage to a charging voltage via a charging circuit;
when the charging-discharging module of the energy storage unit is in the normal charge mode, turning on or turning off a first switching unit via a processing unit to selectively charge a first energy storage unit and a second energy storage unit with the charging voltage via a selecting circuit;
comparing an across voltage of the first energy storage unit with an across voltage of the second energy storage unit in a discharge mode of the charging-discharging module of the energy storage unit;
turning off the first switching unit via the processing unit to allow the first energy storage unit to supply power to a system circuit via the selecting circuit, when the across voltage of the first energy storage unit is larger than the across voltage of the second energy storage unit;
turning on the first switching unit via the processing unit to allow the second energy storage unit to supply power to the system circuit via the selecting circuit, when the across voltage of the second energy storage unit is larger than the across voltage of the first energy storage unit;
detecting whether the charger supports a direct-charge mode;
receiving the input voltage when the charger supports the direct-charge mode;
turning on a second switching unit to make the first energy storage unit and the second energy storage unit charged with the input voltage via the second switching unit in a first charge mode of the direct-charge modes, and turning on a third switching unit to make the first energy storage unit and the second energy storage unit in series connection;
switching the charging-discharging module of the energy storage unit from the first charge mode to a second charge mode via the processing unit when the across voltage of the second energy storage unit minus the across voltage of the first energy storage unit is larger than a first preset value;
turning off the third switching unit and turning on a fourth switching unit via the processing unit to make the first energy storage unit charged with the input voltage via the fourth switching unit in the second charge mode; and
turning on the first switching unit via the processing unit to allow the second energy storage unit to supply power to the system circuit via the selecting circuit in the second charge mode.

5. The charging-discharging module of the energy storage unit according to claim 1 , further including:
a fifth switching unit electrically connected between the second terminal of the second energy storage unit and a ground terminal;
wherein in a third charge mode, the processing unit is configured to turn off the third switching unit and turn on the second switching unit and the fifth switching unit to make the second energy storage unit charged with the input voltage via the second switching unit and the fifth switching unit.

6. The charging-discharging module of the energy storage unit according to claim 5 , wherein in the third charge mode, the processing unit is configured to turn off the first switching unit to allow the first energy storage unit to supply power to the system circuit via the selecting circuit.

7. The charging-discharging module of the energy storage unit according to claim 5 , wherein when the first or the second energy storage unit is charged and the across voltage of the second energy storage unit minus the across voltage of the first energy storage unit is larger than a first p

Assignees

• Asustek Comp Inc

Inventors

• Hsieh Chang-Lin
• Huang Yi-Ming
• Lo Chien-Chung
• Tu Wei-Chen

Classifications

• H02J7/0063

  Electricity · mapped topic

• H02J7/0019

  Electricity · mapped topic

• H02J7/36 Primary

  Arrangements using end-cell switching · CPC title

• H02J7/0073

  Electricity · mapped topic

• H02J7/0068

  Electricity · mapped topic