BATTERY CHARGING SYSTEM HAVING MULTIPLE CHARGING MODES

• US 20120098495A1
• Filed: 08/10/2011
• Published: 04/26/2012
• Est. Priority Date: 10/21/2010
• Status: Active Grant

• Current Assignee: Chervon (HK) Limited (Chervon Holdings Limited)
• Original Assignee: Chervon (HK) Limited (Chervon Holdings Limited)
• Inventors: Yang, Dezhong, Wu, Nanfei, Duan, Junya
• Granted Patent: US 9,252,463 B2
• Time in Patent Office: Days
• US Class Current: 320/115
• CPC Class Codes: H01M 10/44 Methods for charging or discharging circuits for charging H02J7/00
• CPC Class Codes: H02J 7/007 Regulation of charging or discharging current or voltage
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

The present application provides a charging system having a charger and a battery. The charging system provides a quick-charging mode and a normal-charging mode. The quick-charging mode may be activated to charge the battery if certain conditions are met and the charging system may also have an indicating device for indicating when the quick-charging mode is finished. More specifically, the charger of the present application provides selective charging modes and provides an ultra-quick charging solution which may be controlled by the changes in the temperature of the battery and which can increase the charging power to quickly provide enough energy to finish a work task.

Claims

1. A charging system for a power tool, comprising:

a charger;

a lithium ion battery, wherein the lithium ion battery is provided with at least one single lithium ion battery cell with a diameter of approximately 18 mm and a length of approximately 65 mm; and

,

the charging system at least comprising a quick-charging mode, wherein the single lithium ion battery cell can be charged in the quick-charging mode with a charging current equal to or greater than 4.5 A.

2. The charging system according to claim 1, wherein the charging system further comprises:

a normal-charging mode where the charging current is less than that of the quick-charging mode, and the charging system further comprises a control circuit to control the switching of the two charging modes via a mode selection circuit, wherein the mode selection circuit selectively enters into at least one of the quick-charging mode and the normal-charging mode in response to a control signal sent from the control circuit.

3. The charging system according to claim 1, wherein the quick-charging current is at least 6 A.

4. The charging system according to claim 3, wherein the quick charging mode is preset with a first charging time of approximately 3 minutes within which the lithium ion battery can be charged to approximately 25% capacity.

5. The charging system according to claim 2, wherein a charging condition set by the quick-charging mode is that the allowable highest temperature of the battery is 40°

C. and the highest voltage of the battery is 12V.

6. The charging system according to claim 2, wherein the charging system further comprises an indicating device for indicating whether the battery is in the quick-charging mode.

7. The charging system according to claim 6, wherein the indicating device is a control switch with backlight.

8. The charging system according to claim 2, wherein the charging modes can be controlled to switch automatically by the charging system according to the temperature and voltage value detected by a temperature-detecting circuit and a voltage-detecting circuit.

9. The charging system according to claim 2, wherein the control circuit receives a trigger signal to switch the charging modes.

10. The charging system according to claim 9, wherein the trigger signal is caused by the control switch.

11. The charging system according to claim 10, wherein the control switch is a key-press type.

12. The charging system according to claim 10, wherein the charging system further comprises a display device for displaying the state of the normal-charging mode.

13. The charging system according to claim 1, wherein the lithium ion battery has a nominal voltage of 12V and the single battery cell has a nominal voltage of 4V.

14. A charging system for a power tool, comprising:

a lithium ion battery;

a charger having a charging circuit, wherein the charging circuit has a quick-charging mode in which the battery is charged with a first current I1, the charging circuit further comprising a normal-charging mode in which the battery is charged with a second current I2, and the charging circuit further comprises a control circuit to control the switching of the two charging modes via a mode selection circuit, wherein the mode selection circuit selectively enters into the quick-charging mode or the normal-charging mode according to a control signal sent from the control circuit.

15. The charging system according to claim 14, wherein the first current I1 is greater than the second current I2.

16. The charging system according to claim 14, wherein the quick-charging mode is preset with a first charging time t1 and the normal charging mode is preset with a second charging time t2.

17. The charging system according to claim 16, wherein the first charging time t1 is less than the second charging time t2.

18. The charging system according to claim 14, wherein the charging circuit further comprises an indicating circuit for indicating a charging state, a charging mode state, an abnormal state.

19. The charging system according to claim 14, wherein the charging circuit further comprises a temperature-detecting circuit and a voltage-detecting circuit for detecting a temperature and voltage of the battery and transmitting the detected values to the control circuit, the control circuit receives and processes information from the temperature-detecting circuit and the voltage-detecting circuit and other information received from the operation panel to control the charging mode of the charging circuit and transmit the current state information to the indicating circuit.

20. The charging system according to claim 14, wherein the charging circuit further comprises a charging conversion circuit connected to the battery for converting the AC electrical source to a DC electrical source according to the charging mode sent by the mode selection circuit to charge the battery.

21. The charging system according to claim 19, wherein the charging system detects the current temperature and voltage value of the battery via the temperature-detecting circuit and the voltage-detecting circuit to control an automatic switching charging mode.

22. The charging system according to claim 14, wherein the control circuit receives a trigger signal to switch the charging modes.

23. The charging system according to claim 22, wherein the trigger signal is generated by a control switch on an operation panel.

24. The charging system according to claim 23, wherein the control switch is a key-press type.

25. The charging system according to claim 20, wherein the charging conversion circuit comprises an AC-DC input circuit, a DC-DC power supply circuit connected with the AC-DC input circuit, and a DC voltage output circuit connected with the DC-DC power supply circuit.

26. The charging system according to claim 14, wherein the first current I1 is at least 4.5 A.

27. The charging system according to claim 26, wherein the quick-charging mode is preset with a first charging time t1 close to 3 minutes within which the battery can be charged to approximately 25% capacity.

28. The charging system according to claim 14, wherein charging system further comprises an indicating device to indicate when the quick-charging mode is finished.