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Power tool and battery pack for use in the power tool

A technology for electric tools and battery packs, which is applied to battery pack parts, non-aqueous electrolyte storage batteries, batteries, etc., and can solve problems such as reduced cycle life

Inactive Publication Date: 2013-03-06
KOKI HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, there is a risk that the cycle life will be significantly reduced when the lithium ion secondary battery is overcharged or overdischarged, or when an overcurrent is allowed to flow into the lithium ion secondary battery

Method used

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  • Power tool and battery pack for use in the power tool
  • Power tool and battery pack for use in the power tool
  • Power tool and battery pack for use in the power tool

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0121] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, a vertical direction, a horizontal direction, and a front-rear direction represent directions shown in the drawings referred to.

[0122] figure 1 An example of an electric tool mounted with a battery pack according to the present invention is shown. figure 1 An example of using a cordless drill as the electric tool 1 is shown. The electric tool 1 includes a main body portion 2 as a device main body, and a battery pack 10 detachably attached to the main body portion 2 . The battery pack 10 is detachably attached to one end (lower end) of the handle portion 3 in an extending direction along the front-rear direction of the main body portion 2 . The operation portion 23 is arranged on the battery pack 10 , and the operation portion 23 functions as a locking mechanism when the battery pack is installed and also functions as a re...

no. 2 example

[0164] Subsequently, will refer to Figure 10 and Figure 11 An overcurrent protection circuit according to a second embodiment of the present invention is described. Similar to the first embodiment, in the second embodiment, the overcurrent state is detected in the battery pack 10 by using the microcomputer 60 mounted on the board 40 of the battery pack 10 . However, the program executed by the microcomputer 60 is different from that in the first embodiment, and compared with that in the first embodiment, advanced overcurrent protection is performed.

[0165] Figure 10 is a current waveform diagram during operation of the overcurrent protection circuit according to the second embodiment. The horizontal axis is the elapsed time period (seconds), and the vertical axis is the discharge current value (unit A) from the battery pack 10 . The discharge current value is represented by discharge curve 450 . Figure 10 A discharge curve 450 showing a discharge is divided into six...

no. 3 example

[0185] Subsequently, will refer to Figure 12 and Figure 13 An overcurrent protection circuit according to a third embodiment of the present invention is described. In the first embodiment, the microcomputer 60 is mounted on the board 40 of the battery pack 10 , and an overcurrent state within the battery pack 10 is detected using the microcomputer 60 . The third embodiment is the same as the first embodiment in that an overcurrent protection circuit is mounted on the board 240 of the battery pack 210, but is realized by using a dedicated battery protection IC 253 instead of using a circuit of a microcomputer. Furthermore, a FET for interrupting overcurrent is arranged not in the battery pack 210 but on the electric tool 101 side, and the FET can be controlled from the outside while the on and off operations of the FET are controlled from the battery pack 210 side. The same components as those in the second embodiment are denoted by the same reference numerals.

[0186] ...

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PUM

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Abstract

A power tool includes: a battery cell group including a plurality of secondary battery cells; a motor to which an electric power is supplied from the battery cell group through a switching element and a trigger switch; a current detector detecting a current value flowing in a current path; and a controller configured to receive a detection signal from the current detector and controls on / off operation of the switching element. If the current detector detects that the current value flowing in the battery cell group continuously exceeds a given value for a first time period, the controller conducts one of alarm display and alarm control for allowing an operator to recognize that a high load operation continues.; If the current value continuously exceeds the given value for a second time period longer than the first time period, the controller turns off the switching element to interrupt the current path.

Description

technical field [0001] The present invention relates to a cordless power tool using a lithium ion battery, and more particularly, to a cordless power tool having a protection circuit that prevents a relatively large current from continuing for several seconds to overcurrent condition for several minutes. Background technique [0002] An electric tool such as an electric screwdriver, electric drill, or impact tool generally transmits the power of the motor to a tip tool after a speed reduction mechanism decelerates the rotational power from the electric motor. As a power source for the motor, a commercial AC power source has been used so far. However, in recent years, cordless power tools each using a secondary battery represented by a nickel-metal hydride battery or a lithium-ion battery as a power source have come into frequent use. In particular, a lithium ion secondary battery represented by a lithium ion battery and a lithium ion polymer battery can reduce the number o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H01M10/42
CPCY02E60/12H01M10/4207H01M2/1055B25F5/00H02J7/0063B23Q17/007H01M10/052H01M10/425H02J2007/0039H01M10/42H02J7/0031H01M2220/30H01M10/441H02J7/00304Y02E60/10H01M50/213H02J7/00302H02J7/00714H02J7/00711H02J7/00306
Inventor 船桥一彦高野信宏岛敏洋
Owner KOKI HLDG CO LTD
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