Power tool, battery pack, and combination, and method of controlling the same

Patent metadata

Field	Value
Publication number	US-10148111-B2
Application number	US-201615509462-A
Country	US
Kind code	B2
Filing date	Sep 2, 2016
Priority date	Sep 2, 2015
Publication date	Dec 4, 2018
Grant date	Dec 4, 2018

Abstract

A battery pack, power tool, and power tool combination. The battery pack includes one or more battery cells, a first terminal electrically connected to the one or more battery cells, a high current power supply terminal, a power switch electrically connected between the one or more battery cells and the high current power supply terminal, and a low current power supply terminal electrically connected to the one or more battery cells. The first terminal and low current power supply terminal are operable to provide a substantially continuous low current to the power tool during a normal operating state of the battery pack. The battery pack also includes a controller operable to control the power switch to provide high current power through the high current power supply terminal in response to a call for power from the power tool.

First claim

What is claimed is:

1. A battery pack for a power tool, the battery pack comprising:
one or more battery cells;
a first terminal electrically connected to the one or more battery cells;
a high current power supply terminal;
a power switch electrically connected between the one or more battery cells and the high current power supply terminal;
a low current power supply terminal electrically connected to the one or more battery cells, the first terminal and low current power supply terminal operable to provide a substantially continuous low current to the power tool during a normal operating state of the battery pack;
a pinch-off circuit electrically connected between the low current power supply terminal and the one or more battery cells, and
a controller operable to control the power switch to provide high current power through the high current power supply terminal in response to a call for power from the power tool,
wherein the pinch-off circuit includes a switch operable to open the electrical connection between the low current power supply terminal and the one or more battery cells when a battery pack voltage of the one or more battery cells reaches a low voltage threshold.

2. The battery pack of claim 1 , wherein the one or more battery cells have a battery pack voltage, and wherein the first terminal has a voltage substantially corresponding to the battery pack voltage.

3. The battery pack of claim 2 , wherein the first terminal substantially continuously provides the battery pack voltage to the first terminal.

4. The battery pack of claim 1 , wherein the controller is operable to monitor the battery pack voltage and provide a control signal to open the switch when the battery pack voltage reaches the low voltage threshold.

5. The battery pack of claim 1 , wherein the pinch-off circuit includes a fuse operable to open the electrical connection between the low current power supply terminal and the one or more battery cells when current provided through the low current power supply terminal exceeds a high current threshold.

6. The battery pack of claim 1 , further comprising a data terminal, and wherein the call for high current power is received at the data terminal.

7. A power tool connectable to a battery pack, the battery pack including a first terminal, a first high current power supply terminal, a first low current power supply terminal, and a first control terminal, the power tool comprising:
a second terminal electrically connectable to the first terminal of the battery pack;
a second high current power supply terminal electrically connectable to the first high current power supply terminal of the battery pack;
a second low current power supply terminal electrically connectable to the first low current power supply terminal of the battery pack;
a second control terminal electrically connectable to the first control terminal of the battery pack;
a motor, the operation of the motor being based on a high current provided through the second high current power supply terminal;
a power circuit electrically connected to the second terminal and the second low current power supply terminal, the power circuit operable to provide a power based on a substantially continuous low current provided through the second low current power supply terminal;
a user interface;
a controller connected to the power circuit, the user interface, and the second control terminal, the controller operable to be powered by the power from the power circuit, and to provide a call for power to the battery pack over the second control terminal based on a signal received from the user interface.

8. The power tool of claim 7 , wherein the second terminal receives a battery pack voltage when the second terminal is electrically connected to the first terminal of the battery pack.

9. The power tool of claim 7 , wherein the second high current power supply terminal receives a high current when the second high current power supply terminal is electrically connected to the first high current power supply terminal of the battery pack and based on the controller providing a call for high current power to the battery pack.

10. The power tool of claim 9 , wherein a peak high current is greater than 8 amps.

11. The power tool of claim 7 , wherein the second low current power supply terminal receives a low current when the second low current power supply terminal is electrically connected to the first low current power supply terminal of the battery pack and based on the battery pack being in a normal operating state.

12. The power tool of claim 11 , wherein a peak low current is less than 200 milliamps.

13. The power tool of claim 7 , wherein the second control terminal includes a serial communication data line.

14. The power tool of claim 7 , wherein the power tool is a suction force cleaning device that includes an air mover or an agitator.

Assignees

• Tti Macao Commercial Offshore Ltd

Inventors

• Reed Brett

Classifications

• H02J7/585

  Sequential battery discharge in systems with a plurality of batteries · CPC title

• H02J7/63

  against overdischarge · CPC title

• H02J7/82

  Control of state of charge [SOC] · CPC title

• H02J7/70

  characterised by the mechanical construction · CPC title

• H02J7/52 Primary

  for charge balancing, e.g. equalisation of charge between batteries · CPC title