Battery pack for driving electric motor of compact engine starting device, engine starting device driven by the battery pack, and manual working machine having the engine starting device
First Claim
1. A battery pack for driving a compact electric motor of a compact engine starting device mounted on a working machine comprising a compact electric motor, a power accumulating portion in which power of the compact electric motor is transmitted in a power accumulating direction through a highly speed reducer mechanism, and a power transmitting portion for transmitting accumulated force of the power accumulating portion to a crankshaft of an engine, whereinthe battery pack is provided therein with a lithium-based secondary battery comprising at least two cells, a normal protection circuit comprising a self-discharge preventing circuit and an overcurrent preventing circuit, and further provided with a protection circuit comprising an electronic circuit comprising at least an overcharge preventing circuit (B), an overdischarge inhibit circuit (A) and a start switch relay circuit, which are connected to the lithium-based secondary battery, whereina total discharging amount of the lithium-based secondary battery in the battery pack is 500 to 2000 mAh, and charging voltage per one cell is 3.0 to 4.2 V, and whereina maximum discharge current of the lithium-based secondary battery in the battery pack is set to 10 to 60 A, and discharge is automatically stopped when a predetermined continuous discharge time set in accordance with set maximum discharge current elapsed.
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Accused Products
Abstract
This invention provides a battery pack for driving a compact electric motor of a compact engine starting device mounted on a working machine, comprising lithium-based secondary battery comprising two cells, the entire discharge capacity of the cells being 500 to 2000 mAh, charging voltage per one cell being 3.0 to 4.2 V, various electronic circuits like driving and battery protection circuits of an electric motor, maximum discharge current of the battery having high rate of 10 to 60 A, the protection circuit including an overdischarge inhibit circuit (A) interposed in the electric motor driving circuit and automatically stopping the driving operation of the electric motor after time required for starting the engine elapsed, the volume of the battery pack being as extremely low as 2.5×104 to 1.0×105 mm3, the tire required until the engine is started from the actuation of the electric motor being set to an interval as short as 5 to 15 seconds, since high current can flow.
83 Citations
12 Claims
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1. A battery pack for driving a compact electric motor of a compact engine starting device mounted on a working machine comprising a compact electric motor, a power accumulating portion in which power of the compact electric motor is transmitted in a power accumulating direction through a highly speed reducer mechanism, and a power transmitting portion for transmitting accumulated force of the power accumulating portion to a crankshaft of an engine, wherein
the battery pack is provided therein with a lithium-based secondary battery comprising at least two cells, a normal protection circuit comprising a self-discharge preventing circuit and an overcurrent preventing circuit, and further provided with a protection circuit comprising an electronic circuit comprising at least an overcharge preventing circuit (B), an overdischarge inhibit circuit (A) and a start switch relay circuit, which are connected to the lithium-based secondary battery, wherein a total discharging amount of the lithium-based secondary battery in the battery pack is 500 to 2000 mAh, and charging voltage per one cell is 3.0 to 4.2 V, and wherein a maximum discharge current of the lithium-based secondary battery in the battery pack is set to 10 to 60 A, and discharge is automatically stopped when a predetermined continuous discharge time set in accordance with set maximum discharge current elapsed.
Specification