Rechargeable tool battery, mains-operable hand-held power tool, and tool system

• US 10,461,557 B2
• Filed: 03/10/2016
• Issued: 10/29/2019
• Est. Priority Date: 03/10/2015
• Status: Active Grant

• Current Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Original Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Inventors: Ziegler, Bernd, Cecchin, Holger, Meixner, Ralf
• Primary Examiner(s): Williams, Arun C
• Application Number:
  US15/555,882
• Publication Number:
  US 20180041062A1
• Time in Patent Office: 1,328 Days
• CPC Class Codes: B25F 5/00 Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
• CPC Class Codes: H02J 2207/20 Charging or discharging characterised by the power electronics converter
• CPC Class Codes: H02M 3/04 by static converters
• CPC Class Codes: H02M 7/04 by static converters

Abstract

A rechargeable tool battery (200), in particular for supplying a hand-held power tool (100), including a rechargeable tool battery housing (290), inside which a secondary cell battery (210) having a nominal cell voltage (UN) is situated, the rechargeable tool battery (200) including a rechargeable battery DC-DC converter (220), integrated into the rechargeable tool battery housing (290), which is electrically connected to the secondary cell battery (210), and is designed for raising the nominal cell voltage (UN) to a supply voltage (UV) which is tappable at a rechargeable tool battery terminal (295) of the rechargeable tool battery (200).

Claims

1. A rechargeable tool battery comprising:

a rechargeable tool battery housing, a secondary cell battery being situated inside the battery housing and having a nominal cell voltage; and

a rechargeable battery DC-DC converter integrated into the rechargeable tool battery housing and electrically connected to the secondary cell battery, and designed for raising the nominal cell voltage to a supply voltage tappable at a rechargeable tool battery terminal of the rechargeable tool battery.

2. The rechargeable tool battery as recited in claim 1 wherein the nominal cell voltage is less than 42 volts and the supply voltage is more than 42 volts.

3. The rechargeable tool battery as recited in claim 1 wherein the secondary cell battery is made up of series-connected secondary cells and the nominal cell voltage is the sum of the nominal voltages of the series-connected secondary cells.

4. The rechargeable tool battery as recited in claim 1 wherein the rechargeable tool battery terminal is situated on an outer surface of the rechargeable tool battery housing.

5. The rechargeable tool battery as recited in claim 1 wherein the nominal cell voltage is raised to the supply voltage exclusively by way of the rechargeable battery DC-DC converter, and the rechargeable tool battery or the secondary cell battery is free of an electrical bridge circuit.

6. The rechargeable tool battery as recited in claim 1 wherein the supply voltage is adapted to an intermediate circuit DC voltage of an intermediate circuit of a hand-held power tool.

7. The rechargeable tool battery as recited in claim 1 wherein the rechargeable tool battery is for supplying a hand-held power tool.

8. A mains-operable hand-held power tool comprising:

a tool housing;

an electrical drive motor situated in the tool housing;

a rectifier connectable on an input side to an AC voltage network and designed for converting a mains AC voltage into an intermediate circuit DC voltage of an intermediate circuit of the hand-held power tool;

a motor DC-DC converter connected on a converter input side to the rectifier and on a converter output side to the electrical drive motor and designed for converting the intermediate circuit DC voltage into a motor supply voltage;

a supply terminal electrically connected to the intermediate circuit, the the supply terminal being suppliable, independently of mains, with a supply voltage tappable at a rechargeable tool battery terminal of a rechargeable tool battery, the rechargeable tool battery including a rechargeable tool battery housing, a secondary cell battery being situated inside the battery housing and having a nominal cell voltage; and

a rechargeable battery DC-DC converter integrated into the rechargeable tool battery housing and electrically connected to the secondary cell battery, and designed for raising the nominal cell voltage to the supply voltage.

9. The mains-operable hand-held power tool as recited in claim 8 wherein the rectifier is designed in such a way that the intermediate circuit DC voltage of the intermediate circuit during a 230-volt mains operation is greater than 42 volts.

10. The mains-operable hand-held power tool as recited in claim 8 wherein the tool housing includes a receiving bay designed for exchangeably accommodating the rechargeable tool battery.

11. A hammer drill or a combi-hammer comprising the mains-operable hand-held power tool as recited in claim 8.

12. The mains-operable hand-held power tool as recited in claim 8 wherein the supply voltage tappable at the rechargeable tool battery terminal of the rechargeable tool battery corresponds to the intermediate circuit DC voltage of the intermediate circuit of the hand-held power tool during mains operation.