Battery pack, battery charger and charging method having multiple charging modes

• US 8,264,198 B2
• Filed: 02/29/2008
• Issued: 09/11/2012
• Est. Priority Date: 03/09/2007
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Sato, Masanao, Umetsu, Koji, Nagashima, Osamu
• Primary Examiner(s): WILLIAMS, ARUN C
• Application Number:
  US12/040,745
• Publication Number:
  US 20080315846A1
• Time in Patent Office: 1,656 Days
• Field of Search: 320/106, 320/112, 320/155
• US Class Current: 320/112
• CPC Class Codes: H01M 10/44 Methods for charging or discharging circuits for charging H02J7/00
• CPC Class Codes: H02J 7/0071 with a programmable schedule
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A battery pack, a battery charger, a method for charging a battery pack are provided. The battery pack includes a secondary battery, a switch element for controlling charging and discharging the secondary battery, a controller for controlling the switch element, and a communication unit for performing with a battery charger. During charging, an initial charging is switched to a quick charging when a voltage of the secondary battery reaches a predetermined voltage, and the battery charger judges the battery pack as abnormal when the voltage does not reach the predetermined voltage within a timeout period after the initial charging is started. At least one of the timeout period and the predetermined is stored. At least one of the timeout period and the predetermined voltage to be read out is transmitted through the communication unit to the battery charger.

Claims

1. A battery pack comprising:

a secondary battery;

a switch element configured to control charging and discharging of the secondary battery;

a controller configured to control the switch element;

a communication unit configured to perform communication with a battery charger; and

a memory configured to store timeout period data including a timeout period,

wherein, during charging,

an initial charging is switched to a quick charging if a voltage of the secondary battery reaches a predetermined voltage within the timeout period after the initial charging is started, and

the battery charger stops charging and judges the battery pack as abnormal if the voltage does not reach the predetermined voltage within the timeout period after the initial charging is started, and

at least one of the timeout period and the predetermined voltage, which is read out from the memory, is transmitted through the communication unit to the battery charger.

16. The battery pack according to claim 1,

wherein the timeout period is set according to the type of battery pack, and

wherein the timeout period is transmitted through the communication unit to the battery charger.

17. The battery pack according to claim 1,

wherein the memory stores the predetermined voltage and a full charge capacity value of the battery pack, and

wherein the predetermined voltage and the full charge capacity value are transmitted through the communication unit to the battery charger, and wherein the timeout period is based on the full charge capacity value of the battery pack.

19. The battery pack according to claim 1, wherein the timeout period begins at a start of the initial charging.

20. The battery pack according to claim 1, wherein the initial charging is switched to the quick charging before an end of the timeout period if the voltage of the secondary battery reaches the predetermined voltage before the end of the timeout period.

2. A battery charger for a battery pack, comprising:

a communication unit configured to perform communication with the battery pack and receive timeout period data from the battery pack, wherein the timeout period data includes a timeout period;

a memory configured to store the timeout period data received from the battery pack; and

a charging controller configured to perform an initial charge during charging, perform a quick charging if a voltage of the battery pack reaches a predetermined voltage within the timeout period after the initial charging is started, and stop charging and judge the battery pack as abnormal if the voltage does not reach the predetermined voltage within the timeout period after the initial charging is started.

4. The battery charger according to claim 2 or 3, wherein the charging controller uses an initial value preset as the timeout period when starting charging.

5. The battery charger according to claim 2 or 3, wherein

the charging controller:

uses an initial value preset as the timeout period when starting charging,

judges whether a battery voltage of the secondary battery is increased, based on a previously obtained battery voltage and a currently obtained battery voltage, and

sets the timeout period as a new value instead of the initial value when the secondary battery is a high capacity battery and the battery voltage is judged as being increased, and stores the timeout period as the new value in the memory.

3. A battery charger for a battery pack, the battery charger including a secondary battery, the battery charger comprising:

a communication unit configured to perform communication with the battery pack and receive information on a full charge capacity value of the secondary battery from the battery pack;

a charging controller configured to calculate a timeout period based on the full charge capacity value; and

a memory configured to store timeout period data including the timeout period,

wherein the charging controller is further configured to, during charging,

perform an initial charging of the battery pack,

perform a quick charging if a voltage of the battery pack reaches a predetermined voltage within the timeout period after the initial charging is started, and

stop charging and judge the battery pack as abnormal if the voltage does not reach the predetermined voltage within the timeout period after the initial charging is started.

6. A battery charger for a battery pack, comprising:

a communication unit configured to perform communication with the battery pack and receiving information on a predetermined voltage from the battery pack;

a memory configured to store timeout period data including a timeout period; and

a charging controller configured to, during charging, perform an initial charging of the battery pack and perform a quick charging if a voltage of the battery pack reaches the predetermined voltage within the timeout period after the initial charging is started, and stop charging and judge the battery pack as abnormal if the voltage does not reach the predetermined voltage within the timeout period after the initial charging is started.

7. The battery charger according to claim 6, wherein:

the communication unit further receives timeout period data including the timeout period from the battery pack, and

the charging controller judges the battery pack as abnormal by using the timeout period.

8. The battery charger according to claim 6, wherein:

the communication unit further receives information on a full charge capacity value of the secondary battery from the battery pack, and

the timeout period is calculated based on the full charge capacity value, and

the charging controller judges the battery pack as abnormal by using the calculated timeout period.

18. The battery charger for the battery pack according to claim 6, wherein the predetermined voltage received from the battery pack indicates a voltage to switch from the initial charging of the battery pack to the quick charging of the battery pack.

9. A method for charging a battery pack, the method comprising:

communicating with the battery pack and receiving timeout period data from the battery pack, wherein the timeout period data includes a timeout period;

storing the timeout period data; and

performing an initial charging of the battery pack and performing a quick charging if the voltage of the battery pack reaches a predetermined voltage within the timeout period after the initial charging is started, and judging the battery pack as abnormal if the voltage does not reach the predetermined voltage within the timeout period after the initial charging is started.

10. A method for charging a battery pack which includes a secondary battery, the method comprising:

communicating with the battery pack and receiving information on a full charge capacity value of the secondary battery from the battery pack; and

calculating a timeout period based on the full charge capacity value;

storing timeout period data including the timeout period;

during charging,

performing an initial charging of the battery pack,

performing a quick charging if the voltage of the battery pack reaches a predetermined voltage within the timeout period after the initial charging is started, and

stopping charging and judging the battery pack as abnormal if the voltage does not reach the predetermined voltage within the timeout period after the initial charging is started.

11. The method according to claim 9 or 10, wherein a preset initial value is used as the timeout period when charging is started.

12. The method according to claim 9 or 10, wherein:

an initial value preset is used as the timeout period when charging is started, and judging whether the battery voltage of the secondary battery is increased, based on a previously obtained battery voltage and a currently obtained battery voltage, and setting the timeout period instead of the initial value when the secondary battery is a high capacity battery and the battery voltage is judged as being increased.

13. A method for charging a battery pack, the method comprising:

a communication step of performing communication with the battery pack and receiving information on a predetermined voltage and timeout period data including a timeout period from the battery pack; and

a charge control step of, during charging,

(a) performing initial charging of the battery pack,

(b) performing quick charging if the voltage of the battery pack reaches the predetermined voltage within a timeout period after the initial charging is started, and

(c) stopping charging and judging the battery pack as abnormal if the voltage does not reach the predetermined voltage within a timeout period after the initial charging is started.

14. The method according to claim 13, wherein:

in the charge control step, the battery pack is judged as abnormal by using the timeout period.

15. The method according to claim 13, wherein:

in the communication step, information on a full charge capacity value is received from the battery pack, and a timeout period is calculated based on the full charge capacity value, and in the charge control step, the battery pack is judged as abnormal by using the timeout period.