Battery pack, apparatus having the same and method of controlling battery

• US 9,923,397 B2
• Filed: 03/18/2014
• Issued: 03/20/2018
• Est. Priority Date: 08/27/2013
• Status: Active Grant

• Current Assignee: Samsung SDI Company Limited
• Original Assignee: Samsung SDI Company Limited
• Inventors: Ju, Ria, Song, Eui-Hwan
• Primary Examiner(s): Do, Thuan
• Application Number:
  US14/217,761
• Publication Number:
  US 20150061572A1
• Time in Patent Office: 1,463 Days
• Field of Search: 320107
• CPC Class Codes: B60L 2240/547 Voltage
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 58/13 Maintaining the SoC within a determined range
• CPC Class Codes: B60L 58/16 responding to battery ageing, e.g. to the number of charging cycles or the state of health [SoH]
• CPC Class Codes: H02J 2310/40 The network being an on-board power network, i.e. within a vehicle
• CPC Class Codes: H02J 7/0063 with circuits adapted for supplying loads from the battery
• CPC Class Codes: H02J 7/007182 in response to battery voltage
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

A battery pack includes a battery coupled between a first terminal and a second terminal and a battery manager configured to sense a state of charge of the battery; a load circuit coupled between the first terminal and the second terminal and configured to receive discharge power from the battery; a power generator coupled between the first terminal and the second terminal and configured to supply charge power to the battery; and a controller configured to control the battery pack and the power generator and to force discharging of the battery to make the state of charge of the battery equal to a reference value when a signal to initiate self-discharging is received from a user.

Claims

1. A battery pack-equipped apparatus comprising:

a battery pack comprising a battery coupled between a first terminal and a second terminal, and a battery manager configured to sense a state of charge of the battery;

a load circuit connected between the first terminal and the second terminal, and configured to receive discharge power from the battery;

a power generator coupled between the first terminal and the second terminal, and configured to supply charge power to the battery; and

a controller configured to control the battery pack via a third terminal, to control the load circuit by turning on a function of the load circuit, to control the power generator to charge the battery, and to force discharging from the battery to the load circuit to make the state of charge of the battery equal to a reference value when a signal to initiate self-discharging is received from a user.

2. The apparatus of claim 1, wherein the battery pack-equipped apparatus is a vehicle, and

wherein the signal to initiate self-discharging is a long-term parking signal of the vehicle.

3. The apparatus of claim 1, wherein the controller is configured to contol the battery pack to make the battery output discharge power to the load circuit.

4. The apparatus of claim 1, wherein the battery further comprises a discharge circuit coupled between the first terminal and the second terminal, and

wherein the controller is configured to control the battery pack to make the battery output discharge power to the discharge circuit.

5. The apparatus of claim 1, wherein the controller is configured to charge the battery by controlling the power generator to make the state of charge of the battery equal to the reference value upon receipt of the signal to initiate self-discharging.

6. The apparatus of claim 1, wherein the reference value is in a range between a first state of charge and a second state of charge, and

wherein the controller is configured to change the first state of charge or the second state of charge according to a state of health (SOH) of the battery.

7. The apparatus of claim 1, wherein the controller is configured to control each of various power-consuming parts of the load circuit.

8. The apparatus of claim 2, wherein the power generator is configured to convert rotation power corresponding to motion of the vehicle into electric energy.

9. A method of controlling a battery using a controller, the method comprising:

receiving a signal to initiate self-discharging from an external device;

sensing a state of charge of the battery indicating a degree to which the battery is charged;

comparing the sensed state of charge with a reference value; and

performing forced discharging from the battery to a load circuit when the sensed state of charge is greater than the reference value by turning on a function of the load circuit and outputting discharge power of the battery to the load circuit.

10. The method of claim 9, further comprising charging the battery when the state of charge is less than the reference value.

11. The method of claim 10, wherein the charging of the battery comprises supplying charge power to the battery from a power generator coupled to the battery.

12. The method of claim 9, wherein the reference value is in a range between a first state of charge and a second state of charge, and

wherein the first state of charge or the second state of charge varies according to a state of health (SOH) of the battery.

13. A battery pack comprising:

a battery coupled between a first terminal and a second terminal, and configured to receive charge power and to output discharge power;

a discharge circuit; and

a battery manager configured to receive a signal to initiate self-discharging from an external device, and to control forced discharging from the battery to a load circuit by turning on a function of the load circuit to make a state of charge (SOC) of the battery, which indicates a degree to which the battery is charged, equal to a reference value by controlling the discharge circuit to discharge the battery and outputting discharge power of the battery to the load circuit or to the discharge circuit.

14. The battery pack of claim 13, wherein the battery manager is configured to transmit a signal to initiate charging to the external device when the state of charge of the battery is less than the reference value.

15. The battery pack of claim 13, wherein the battery manager is configured to transmit a signal to initiate discharging to the external device when the state of charge of the battery is greater than the reference value.

16. The battery pack of claim 13, wherein the discharge circuit is coupled between the first terminal and the second terminal.

17. The battery pack of claim 13, wherein the reference value is in a range between a first state of charge and a second state of charge, and

wherein the battery manager is configured to change the first state of charge or the second state of charge according to a state of health (SOH) of the battery.