| 摘要 |
A portable self-contained electric power tool unit, includes at least three distinct sub-assemblies. The tool is characterised in that the second sub-assembly ( 3 ) may be carried by the user and includes a lithium-ion or lithium-polymer electrochemical battery ( 5 ) formed by combination of more than four cells ( 6 ) in series, each cell being made of one or several elements in parallel and a control and operating module ( 7 ) for the battery ( 5 ), guaranteeing a maximum battery capacity over time in a controlled manner and an optimal use of the tool. The first sub-assembly ( 2 ), during operation thereof, is subject to control by a current-limiting system ( 8 ), for preserving the lithium-ion or lithium-polymer battery ( 5 ) from which the above draws energy and the third sub-assembly ( 4 ) has at least one source of electrical supply, the voltage and current of which are suitable for the recharging of the lithium-ion or lithium-polymer battery ( 5 ).
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