Electrical energy storage device

• US 6,373,152 B1
• Filed: 02/09/2000
• Issued: 04/16/2002
• Est. Priority Date: 12/17/1999
• Status: Expired due to Term

• Current Assignee: SYNergy ScienTech Corp.
• Original Assignee: SYNergy ScienTech Corp.
• Inventors: Huang, Shun-Ming, Wu, Wei-Chen, Wang, Pei-Jen
• Primary Examiner(s): Ballato, Josie
• Assistant Examiner(s): DeBeradinis, Robert L
• Application Number:
  US09/501,508
• Time in Patent Office: 797 Days
• Field of Search: 307/150, 307/125, 307/109, 320/103, 320/167, 320/112
• US Class Current: 307/150
• CPC Class Codes: H02J 7/00302 Overcharge protection
• CPC Class Codes: H02J 7/00304 Overcurrent protection
• CPC Class Codes: H02J 7/00306 Overdischarge protection
• CPC Class Codes: H02J 7/00308 Overvoltage protection
• CPC Class Codes: H02J 7/345 using capacitors as storage or buffering devices

Abstract

An electricity storage device and a portable electric-powered tool. The device comprises at least a battery; at least a super capacitor, which has lower internal impedance, when fully charged, than that of the battery and connects the battery in parallel; and an output end for supplying the electricity. The super capacitor is the major power supply for the pulse current output; the battery is used for generating electricity to the super capacitor and is the secondary power supply for the pulse current output. The connection of the battery and the super capacitor does not need any converters or current-limiting resistors.

Claims

1. An electricity storage device, comprising:

at least one battery;

at least a super capacitor, which has lower internal impedance when fully charged than that of the battery and connects the battery in parallel; and

an output end for supplying the electricity;

whereby, the super capacitor is the major power supply for pulse current output, and the battery is used for providing electricity to the super capacitor and is the secondary power supply for pulse current output.

2. The electricity storage device of claim 1, further comprising a battery protection and control device and a bi-directional switch which is connected in series with the battery;

wherein the battery protection and control device is used for controlling the bi-directional switch.

3. The electricity storage device of claim 1, wherein the battery is a secondary battery.

4. The electricity storage device of claim 1, wherein the battery is a lithium secondary battery.

5. A portable electric-powered tool, comprising:

a tool body; and

a battery pack for supplying electricity to the tool body;

the battery pack comprises at least a battery and at least a super capacitor which connects the battery in parallel;

wherein the super capacitor has less internal impedance when fully charged than that of the battery;

whereby, the super capacitor is the major power supply for pulse current output, and the battery is used for providing electricity to the super capacitor and is the secondary power supply for pulse current output.

6. The portable electric-powered tool of claim 5, wherein the battery pack further comprises a battery protection and control device and a bi-directional switch which is connected in series with the battery;

the battery protection and control device is used for controlling the bi-directional switch.

7. The portable electric-powered tool of claim 5, wherein the battery is a secondary battery.

8. The portable electric-powered tool of claim 5, wherein the battery is a lithium secondary battery.