TAILIEUCHUNG - Power Tools: Batteries

The name ‘power tool’ originally describes a tool that is powered by an electrical motor. Thus, the effort needed by an operator is reduced through using this tool. Today the term ‘power tool’ or ‘cordless tool’, as it is also called sometimes, is most commonly used for an electric tool, which is powered by batteries. This makes the user independent of power outlets. Power tools include drills and screwdrivers as well as hammers, saws, grinders, etc. They replace their electric power grid– connected equivalents. The first electrified drill was patented by Arthur James Arnot (1865–1946) on 20 August 1889,. | Power Tools Batteries W Weydanz Siemens AG Erlangen Germany 2009 Elsevier . All rights reserved. Introduction The name power tool originally describes a tool that is powered by an electrical motor. Thus the effort needed by an operator is reduced through using this tool. Today the term power tool or cordless tool as it is also called sometimes is most commonly used for an electric tool which is powered by batteries. This makes the user independent of power outlets. Power tools include drills and screwdrivers as well as hammers saws grinders etc. They replace their electric power grid-connected equivalents. The first electrified drill was patented by Arthur James Arnot 1865-1946 on 20 August 1889 in Melbourne Australia. In 1895 Wilhelm Emil Fein 1842-1898 produced the first power tool in Stuttgart Germany. This is an electric hand drill to be operated on a workbench Figure 1 . On 6 November 1917 the pistol grip and trigger switch on an electric drill were patented by S. D. Black and A. G. Decker of Black Decker Co. Baltimore Maryland USA. In 1925 FEIN GmbH launched the first electrical screwdriver. Today power tools are cordless electric tools powered by a rechargeable battery pack. A modern power tool with a pistol grip and trigger using a nickel-cadmium Ni-Cd battery pack is shown in Figure 2. Power Tool Operation Requirements way into the material. The final rise of current up to a shutoff current marks the tightening of the screw towards the end of the process. Peak currents are around 20-25 A and mean operation current is about 8 A for this application. Average power is about 50-100 W where peak power can be up to 250 W. Resulting from the above current requirement temperature rise of the battery pack is a consideration. This is especially true for continuous use or in fast charging of the battery pack. In use medium currents are about 4 C-5 C rate and peak current can be well over a 10 C rate. Charging currents can be up to 2 C rate allowing charging of the

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