Patent · US Expired

Battery pack for hand-held electric machine tools

US7498774B2 · kind B2 · utility

8Cited by

5References

6Claims

0Family size

Assignee

Hilti Aktiengesellschaft · LI

Inventors

Bernd Ziegler · Ludwigshafen, DE
Bernd Heigl · Augsburg, DE
Stephan Krebs · Eschborn, DE

Key dates

Filing date	Jun 29, 2005
Grant date	Mar 3, 2009
Priority date	—
Expiry date	Mar 3, 2026

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02E60/10
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A battery pack (2) for an associated hand-held electric machine tool (1) and for an associated charging device (13) including an analog temperature sensor (3) with a negative temperature coefficient and a temperature measuring interface (4) accessible from the outside. Battery protection electronics (5) arranged in the hand-held electric machine tool (1) and in the charging device (13), which have a battery protection logic (6) and a power switch (8) that is arranged in the circuit path (7) of the battery pack (2) can be influenced. The battery pack (2) is provided with an emergency protection circuit (10), which is connected in parallel with the analog temperature sensor (3) and which, in emergency situations, can actively reduce the total resistance (R) measurable from the outside via the temperature measuring interface (4).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.