CN100492753C - 电池组以及用该电池组作为电源的无绳电动工具 - Google Patents
电池组以及用该电池组作为电源的无绳电动工具 Download PDFInfo
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Abstract
为了避免电池过放电并改善电池循环寿命,当电池电压等于或低于第一预定值时,一微型计算机电中断电池和无绳电动工具之间的连接,强迫停止驱动电动工具。为了确保操作者知道电池接近过放电状态,当电池电压高于第一预定电压但是等于或低于第二预定电压时,微型计算机对负荷电流进行开关控制。结果,电动工具的电动机的转动突然变慢或电动机以不规则方式进行转动,因此使操作者意识到电池处于需要充电状态。
Description
技术领域
本发明涉及一种包括蓄电池的电池组,所述蓄电池被用作无绳电动工具的电源。
背景技术
最近,诸如镍镉电池、镍氢电池和锂离子电池的蓄电池的容量增加,并极大改善了它们在用大电流进行充/放电时的充/放电性能。这些高性能蓄电池被用作诸如无绳电动工具(在下文简称为电动工具)的高负荷机器的电源。在电动工具中所使用的蓄电池通常是电池组形式,它包括蓄电池组单元电池所组成的电池,所述蓄电池单元电池由诸如连接板串连。所述电池组被安装在电动工具上,用于驱动电动机拧紧螺钉或执行其它操作。
然而,当使用电池组作为电源驱动电动工具时,直到蓄电池几乎放电完毕之前,电动机的旋转速度不会发生明显的下降。而一旦蓄电池放电完毕,电动机就突然停止转动。因此,操作者通常连续使用电动工具一直到电动机停转。这样就可能缩短电池组的循环寿命。
由于组成电池的电池单元的容量变化,电池组的循环寿命缩短。也就是当包含在同一电池组内的正常容量电池单元被适当充电和放电时,低容量电池趋向于过充电和过放电,与其它电池单元相比,将缩短低容量电池单元的寿命。
图1显示了电池的放电性能和电池中两种类型电池单元的放电性能。曲线A代表在电池放电期间所观察到的电池输出电压随时间的变化。曲线B和C代表所观察到的电池的不同电池单元的输出电压随时间的变化。曲线B表示的电池单元所具有的容量等于电池中其它所有电池单元的平均容量。曲线C表示的电池单元所具有的容量小于所述平均容量。由于经判断电池电压不足以驱动电动工具的电动机,假设操作者在时间S时关闭电动工具。
随着电池放电,电池电压逐渐下降直到电池几乎耗尽。因此电压迅速下降。从曲线C可以看到,在具有平均容量的电池单元的电压下降之前,低容量电池单元开始迅速下降,如圆圈D所示,在停止放电时间S之前,其电压低于0V。在此情况下,低容量电池单元处于过放电状态,被称作“换极状态”。当电池单元处于换极状态时,在电池单元的正极产生氢气,所述氢气积聚在电池单元内部。当重复进行充电和放电时,电解液可能从电池单元泄漏,可能降低电池的循环寿命。
具体地说,当电池组被用在电动工具中,用于驱动处于重负荷下的电动机时,例如用于拧紧螺钉时,蓄电池的循环寿命可能被降低。这是由于一直使用电池直到电动机停止转动为止。通常,电动工具不具有阻止电池过放电的功能。
发明内容
综上所述,本发明的一个目的是克服现有技术所存在的问题,通过确保操作者知道电池几乎完全放电,从而可以阻止过放电,改善电池组的循环寿命。
根据本发明的一个方面,提供一种电池组,它包括一电池、一电池电压检测器、检测装置和报警装置。所述电池包括包括多个串联可充电的蓄电池电池单元。该电池具有与电池组正极端相连的第一端以及和所述电池组负极端相连的第二端。所述电池电压检测器用于检测电池第一端和第二端之间电池电压。根据电池电压检测器所检测的电池电压,所述检测装置检测电池已经达到需要充电的状态,所述需要充电状态表示电池需要被充电,当检测到需要充电状态时,该检测装置输出一检测信号。响应于所述检测信号,所述报警装置提醒用户在使用电池作为一连接在所述正极端和负极端之间的负荷的电源期间给该电池充电,该报警装置给用户一物理上可察觉印象,从而用户可以意识到电池的需要充电状态。
最好,所述报警装置可以通知负荷产生物理上可察觉印象。可以进一步设置一显示装置,用于显示一种报警信号,即电池已经到达需要充电状态,报警装置通知用户对电池进行充电。
最好,所述报警装置包括设置在第一端和正极端之间或第二端和负极端之间的电流通路内的开关装置。所述开关装置执行开关动作,当开关装置开启时,允许电流流过负荷,当开关装置关闭时,中断电流流向负荷。通过所述开关装置所执行的开关操作,降低了平均电流值。因此被降低后的电流将连续流向负荷。因此将电池组用于电动工具时,电动工具电动机的转动将放慢,操作者可以通过电动机速度变化知道电池接近放电状态并采取行动,阻止电池过放电。
通过将电流设定为一低水平电流,可以降低负载电流。在此情况下,电动工具的电动机将以固定的低速转动。另一种情况是,通过周期性地将负载电流在一比普通负载电流还低的范围内改变,可以降低负载电流。在此情况下,电动机的转速将周期性改变,在任何一种情况下,操作者将接收到一可察觉的警告,该警告引起他或她注意到电池的放电情况。
用于确定电池处于需要充电状态的电池电压可以是这样一种电压,即对应于电池接近过放电状态时的一电压或可以是刚刚达到过放电状态之后所对应的一电压。当对应于需要充电状态的电压与一过放电状态之后的电压对应时,当检测到电池电压已经下降到或低于一预定电压时,希望停止电流流向电动工具。
当电池电压检测器所检测到的电池电压已经等于或低于第一预定电压时,希望所述检测装置检测到电池已经达到一临界状态,当电池电压检测器检测到电池电压已经等于或低于第二预定电压但是高于第一预定电压时,希望所述检测装置检测到电池已经达到一接近过放电状态。需要充电状态包括接近放电状态和临界状态。
在此情况下,当检测到接近过放电状态时,开关装置执行开关操作,以降低电流平均电平。当检测装置检测到临界状态时,希望所述开关装置关闭,以停止驱动负荷。最好设置一显示装置,当检测到临界状态时,显示电池已经达到临界状态的第一报警,并显示电池已经接近过放电状态的第二报警。由于第一显示器显示出电池已经到达临界状态的第一报警,该报警可能意味着一放电状态,所以操作者可以知道电动工具的电动机停止转动的原因是电池中的电能几乎耗尽。当第一预定电压被设定为一对应于恰好在达到过放电状态之后的电压的电压时,显示装置可以被设定用于读出电池过放电。当第二预定电压是对应于电池接近过放电时的电池电压的电压时,显示器可以显示电池接近过放电。
可以进一步设置一用于检测电池温度的电池温度检测器,当所述电池温度检测器检测到的电池温度超过一预定温度时,使所述开关装置关闭。当电池连续放电时,与放电持续时间成比例地产生焦耳热,从而电池温度增加。如果电池温度变得太高,电池中的电解液将沸腾。即使电池温度没有高到足以使电解液沸腾,连续在高温下使用电池也将降低电池的寿命。因此需要控制电池的温度。使用电池温度检测器,判断电池温度是否处于高过预定温度的不正常高温下。当电池温度被判断为高得不正常时,禁止电池继续放电,禁止继续使用电动工具。
附图说明
通过下文结合附图对优选实施例所进行的介绍,本发明的上述和其它目的、特征和优点将变得更加清楚。
图1是一个显示了传统电池放电性能的图表;
图2是一个电路图,显示了符合本发明一实施例的与电动工具相连的电池组;
图3是一个流程图,表示了图2所示电池组的控制装置所执行的操作。
具体实施方式
下文将结合图2和3介绍本发明电池组1的一个实施例。图2是一个显示与电动工具200相连的电池组1的电路图。电池组1具有正极2和负极3。正极2与电动工具200的正极201相连,负极3与电动工具200的负极202相连。一直流电动机210和开关220被串连在电动工具200的正极201和负极202之间。
电池组1包括一电池10,一开关部分20、一恒定电压电源30、一电池电压检测器40、一电池温度检测器50、一微型计算机60、一电流检测器70、一触发检测器80和一显示器90。
电池10包括利用连接板而串联的电池单元11—18。假定电池10的电池单元具有相同的容量。然而现实中,电池单元11—18的容量出现某种变动。
在电池组1与电动工具200相连期间,当电动工具200的开关220被开启时,放电电流从电池10的正极流经电动工具200到电池10的负极。电池电压检测器40、恒定电压电源30、一触发检测器80和开关部分20与放电电流路径相连,微型计算机60与包含在电池组1内的这些和其它元件相连。
微型计算机60包括一中央处理单元(CPU)61、一只读存储器(ROM)62、一随机存取存储器(RAM)63、一计时器64、一模拟—数字(A/D)转换器65、一输出端口66和一复位输入端口67。微型计算机60的元件通过一内部总线彼此相连。
开关部分20被连接在电池10的正极和电池组1的负极之间,它包括一场效应晶体管(FET)和电阻23、24。来自微型计算机60的输出端口66的控制信号通过电阻24提供到FET21的栅极,以执行对流经电动工具200的负载电流的开关控制。连接在FET21的源极和漏极之间的二极管22被用作充电电流通路,在电池10利用在电动工具200所在位置与电池组1相连的充电器(未示)进行充电时,所述充电电流流过二极管22。
电流检测器70被用于判断是否电池10正在被充电、放电或在其它状态下,例如电池是否处于负载下。电流检测器70的输入端与二极管22的阴极和FET21的漏极相连。电流检测器70的输出端与微型计算机60的A/D转换器65相连。
虽然没有示出,电流检测器70包括彼此平行相连的一反向放大电路和一非反向放大电路,所述放大电路有选择地放大施加在电流检测器70上的电压。根据电流方向,也就是是否充电电流正在流经二极管22或放电电流正在流经FET21,确定施加在电流检测器70上的电压极性。根据FET21的ON电阻和二极管22的ON电压,确定施加在电流检测器70上的电压大小。因此,根据电池10是被充电还是被放电,利用反向放大电路或非反向放大电路生成输出。利用微型计算机60的A/D转换器65,对电流检测器70的输出进行A/D转换。如果希望准确地检测充电和放电期间的电流值,可以将低阻电流检测电阻设置在电流回路中。在此情况下,符合流经所述电阻的电流值的电压可以被可运算放大器放大。A/D转换器65对上述运算放大器的输出进行A/D转换,根据所获得数字式输出,计算电流值。
恒定电压电源30包括一个三端调节器(REG)31、平滑电容器32、33和一复位IC34。来自恒定电压电源30的恒定电压输出VCC被用作电池温度检测器50、微型计算机60、电流检测器70和显示器90的电源。复位IC34与微型计算机60的复位输入端67相连,并向复位输入端67输出一复位信号,以便在微型计算机60内进行初始设置。
设置电池电压检测器40,用于检测电池10的电压,所述电池电压检测器40包括电阻41~43。电阻41、42在电池10的正极和地之间串联。通过电阻43,将微型计算机60的A/D转换器65与电阻41、42连接在一起的连接点相连,并输出对应于检测到的电池电压的数字值。微型计算机60的CPU61将来自A/D转换器65的数字值与将在下文介绍的第一和第二预定电压值进行比较。所述第一和第二预定电压值被存储在微型计算机60的ROM62内。
电池温度检测器50被设置在电池10的附近,用于检测电池10的温度。在严格意义上说,电池温度检测器50所检测到的温度值并不是电池10的温度,但是它基本上等于电池10的温度。所述电池温度检测器50包括热敏电阻51和电阻52~54。通过电阻53,热敏电阻51与微型计算机60的A/D转换器65相连。因此,A/D转换器65输出对应于电池温度检测器50所检测到的电池温度的一数字值。微型计算机60的CPU61将该数字值与预定值进行比较,用以判断是否电池温度不正常地高。
触发检测器80包括电阻81、82,并检测电动工具200的开关220何时被开启。当开关220被关闭时,电池10的电压没有被施加到FET21的漏极。因此与触发检测器80相连的A/D转换器65的输入端保持在地电位。另一方面,由于直流电动机210的直流电阻极小,例如仅仅几欧姆,因此在开关220开启时,FET21的漏极和源极之间产生几乎与电池电压相等的电压。这个电压被电阻81、82所分担,施加在电阻82上产生的电压被施加到A/D转换器65上,从而可以检测到开关220的开启状态。
显示器90包括一发光二极管(LED)91和一电阻92。根据微型计算机60的输出端66的输出,控制LED91的发光或关闭。控制显示器90的显示,例如当电池温度检测器50检测到电池温度比预定温度高时,发出电池10的温度过高的警告。
下文将结合图2的电路和图3的流程图介绍电池组1的操作过程。
首先在步骤S301,微型计算机60对输出端66进行初始设置,使它的过放电标志、启动脉冲控制标志以及不正常电池温度标志为0。所述过放电标志表示电池10过放电。启动脉冲控制标志表示电池10接近过放电。不正常电池温度标志表示电池温度不正常地高。
在步骤S302,微型计算机60判断是否不正常电池温度标志被设定为1,将在下文介绍,如果电池温度已经达到例如80℃,然后微型计算机60判断电池10已经达到不正常高的电池温度。电池10生成与放电时间成比例的焦耳热。根据电池10何时被使用以及已经使用了多长时间,在开始新的使用时,电池10可能就处于不正常的高温下。如果在不正成高温下使用电池10,电池10的寿命将被缩短。因此应该停止使用电池直到它的温度降低为止。
如果判断不正常电池温度标志被设定为1(步骤S302:是),这意味着电池10温度不正常地高。因此在步骤S303,控制显示器90,使其显示电池10温度过高。然后在步骤S304,根据电池温度检测器50的输出,判断电池10的温度是否已经冷却到预定温度。如果电池10没有冷却(步骤S304:否),则流程返回到步骤S302,直到电池温度充分下降为止。一旦电池温度下降到预定温度(步骤S304:否),则在步骤S305,不正常电池温度标志被设定为0。然后在步骤S306,控制显示器90使它停止显示电池温度过高,然后流程返回步骤S302。
当在步骤S302判断不正常电池温度标志没有被设定为1(步骤S302:否),这意味着,在电池10温度不太高时,则在步骤S307判断是否过放电标志被设定为1。所述过放电标志表示电池10是否过放电,当过放电标志被设置为1时,意味着电池10过放电,当过放电标志被设定为0时,意味着电池10没有过放电。当判断过放电标志被设置为1(步骤S307:是)时,然后在步骤S308,根据输出端口66的输出,显示器90显示电池10过放电。敦促用户对电池10进行充电。
随后在步骤S309,判断是否电池10被充电。由于在步骤S307判断过放电标志被设置为1,电池10不能被使用直到电池10被充电为止。根据流过电池10的电流方向,判断是否电池被充电。也就是充电电流从负极通过二极管22到达电池10的正极。因此,根据电流检测器70所检测到的电流方向,判断电池是否正在被充电。一旦在步骤S309判断充电已经持续了一固定时间(步骤S309:是),流程就进入步骤S310。应该指出的是,通过将电池组1从电动工具2000上拆卸下,并将电池组1与单独的电池充电器(未示)相连,对电池10进行充电。
如果判断电池10还没有被充分充电(步骤S309:否),流程返回步骤S302,直到充电完毕为止。一旦判断电池10已经被充分充电(步骤S309:是),然后在步骤S310,过放电标志被重新设置为0,在步骤S311,控制显示器90,停止显示电池10过放电,然后返回步骤S302。
当过放电标志没有被设置为1(步骤S307:否)时,在步骤S312,根据电池温度检测器50的输出,判断是否电池温度不正常地高。如果电池温度超过例如80℃,温度太高了,在步骤S313,将过不正常电池温度标志设置为1,根据输出端口66的输出,在步骤S314,显示器90显示电池10的温度太高了。在此情况下,在步骤S327,根据输出端口66的输出,开关部分20的FET21被关闭,流程返回步骤S302。
如果判断电池10并不过热(步骤S312:否),在步骤S315,检测开关部分20的FET21的漏极和源极之间电压VDS。然后在步骤S316,根据触发检测器80的输出,判断电动工具200的开关220是否开启。当开关220开启时,在FET21的漏极和源极之间产生近似等于电池电压的电压。因此根据在步骤S315所检测到的电压VDS,可以判断开关220是否开启。
当开关220没有开启时(步骤S316:否),流程返回步骤S302。如果开关220开启(步骤S316:是),在步骤S317,根据输出端口66的输出,开关部分20的FET21被开启。然后,在步骤S318,根据电流检测器70的输出,判断电池10是否正在放电。如果电池10没有正在放电(步骤S318:否),在步骤S327,根据输出端口66的输出,开关部分20的FET21被关闭,流程返回步骤S302。
如果电池10正在放电(步骤S318:是),在步骤S319,判断是否启动脉冲控制标志被设定为1。如果启动脉冲控制标志被设定为1(步骤S319:是),流程跳跃到步骤S324。
如果启动脉冲控制标志没有被设定为1(步骤S319:否),那么在步骤S320,根据电池电压检测器40的输出,判断电池10的电压是否到达第二预定值或更低。在本实施例中,电池电压是否为等于或低于第二预定值是电池10是否接近过放电的状态。根据放电电流的大小,表示电池10接近过放电状态的电池电压不同。在用于电动工具的电池中,当镍镉或镍氢电池单元的电压降到的0.9~1.0V时,可以说接近过放电状态。当3.6V的锂离子电池单元的电池电压减少到2.5~2.7V时,可以说接近过放电状态。在本实施例中,电池10是采用具有10个单元的镍镉或镍氢电池,所以表示接近过放电状态的电池电压是9~10V。
将在下文结合步骤S324介绍的第一预定电压被用作基准电压,用于判断电池10实际是否已经达到过放电状态。因此,第一预定电压比第二预定电压低。用于表示电池10已经达到过放电状态的基准同样也取决于放电电流大小而不同。对于用于电动工具的电池来说,当镍镉或镍氢电池单元的电压约0.8~0.9V时,可以说达到过放电状态。当3.6V的锂离子电池单元的电池电压减少到2.3~2.5V时,可以说达到过放电状态。根据这些值确定所述第一预定值。
当电池10的电压不是第二预定值或更低时(步骤S320:否),这意味着可以连续电池放电而不会伤害电池10。因此在步骤S328,根据电池温度检测器50的输出,判断电池10是否过热。采用与步骤S312相同的方式执行步骤S328的判断。当电池10过热时(步骤S328:是),在步骤S329,根据输出端口66的输出,将不正常电池温度标志设定为1,在步骤S330,显示器90显示电池温度过高。然后在步骤S327,根据输出端口66的输出,开关部分20的FET21被关闭,流程返回步骤S302。如果电池温度不正常地高(步骤S328:否),流程返回步骤S318。
如果判断电池10的电压等于或低于第二预定电压(步骤S320:是),这意味着电池10接近过放电状态。因此在步骤S321,根据输出端口66的输出,开启脉冲控制,按照预定频率,执行对开关部分20的FET21开关操作。当启动脉冲控制时,施加到直流电动机210上的平均电压下降,从而直流电动机210以更低的速度转动。电动工具200的操作者可以察觉到直流电动机210速度的变化,并且明白这意味着电池10已经接近过放电状态。
在步骤S321开启脉冲控制后,在步骤S322,将开启脉冲控制标志设定为1。然后在步骤S323,利用输出端口66的输出控制显示器90,显示电池接近过放电。电动工具200的操作者可观看显示器来确认直流电动机210转动放慢的原因是由于电池即将耗尽。然后在步骤S324,根据电池电压检测器40的输出,判断电池10的电压是否已经到达第一预定电压或更小。如果电池10的电压没有到达第一预定电压或更小(步骤S324:否),然后流程跳跃到步骤S328。
如果电池10的电压到达第一预定电压或更小(步骤S324:是),从而断定电池10已经进入过放电状态。因此在步骤S325,将电池过放电标志设定为1,在步骤S326,根据输出端口66的输出,显示器90显示表示电池过放电状态。随后在步骤S327,开关部分20的FET21关闭,流程返回步骤S302。
虽然本发明是结合具体实施例进行详细描述的,但是对于本领域普通技术人员来说,很显然可以对本发明作出各种改变和修改,而不脱离本发明权利要求书所限定的精神范围。
例如,实施例介绍在使用电动工具期间,当电池电压为第二预定电压或更小时,开关部分20被控制强迫降低直流电动机210的速度(第一控制)。此外,当电池电压小于第二预定电压同时等于或小于第一预定电压时,控制开关部分20以切断供应给直流电动机210的负载电流(第二控制)。
然而可以用下述方式修改上述实施例,例如免除第一控制,仅仅执行第二控制(第一修改)。也可以用下述方式修改上述实施例,免除第二控制,仅仅执行第一控制(第二修改)。当进行第二修改时,当电池电压已经到达第一预定电压或更小之后,直流电动机210的速度应该被降低到这样一种程度,即操作者无法再使用电动工具200。这迫使操作者对电池10进行充电,阻止由于连续使用电动工具造成电池10过放电。当进行第二修改时,第一预定电压可以被设定为一电压,该电压对应于接近电池10过放电状态,而不将预定电压设定为对应于过放电状态。
当直流电动机启动时出现很大的瞬时电流,导致电池电压瞬时下降。因此虽然在图3的流程图中没有显示,在步骤S320和S324作出的用于在使用期间确定电池电压的判断需要费时间考虑。
步骤S314和S330的显示操作表示电池10过热,步骤S323的显示操作表示电池接近过放电,以及步骤S326的显示操作表示电池10处于过放电状态,这些操作可以这样执行,即以对应于上述要显示的不同状态的频率,开启和关闭LED91。另一种方案是,多个LED(图2的电路中未示)可以被设置在一用于显示对应于这些不同状态的信息等的阵列中。
上述实施例中,开关部分20被连接在电池10的负极和电池组1的负极之间。然而开关部分20也可以被连接在电池10的正极和电池组1的正极2之间。
Claims (10)
1.一种具有一正极和一负极的电池组,包括:
一包括多个串联连接的可充电蓄电池组电池单元的电池,该电池具有与所述正极相目连的第一端以及和所述负极相连的第二端;
一用于检测所述电池第一端和第二端之间的电池电压的电池电压检测器;
检测装置,用于根据所述电池电压检测器所检测的电池电压来检测所述电池是否已经达到表示所述电池需要充电的需要充电状态,当检测到所述需要充电状态时,该检测装置输出一检测信号;
报警装置,响应于所述检测信号,该报警装置提醒用户在使用所述电池作为一连接在所述正极和负极之间的负荷的电源期间给该电池充电,该报警装置给所述用户一物理上可察觉的印象,从而使所述用户可以意识到所述电池的需要充电状态,
其中,当所述电池电压检测器检测到的电池电压已经等于或低于第一预定电压时,所述检测装置检测到所述电池已经达到一临界状态,当所述电池电压检测器检测到的电池电压已经等于或低于第二预定电压但是高于所述第一预定电压时,所述检测装置检测到所述电池已经达到接近过放电状态,所述充电需要状态包括所述接近充电状态和所述临界状态,
其中,所述报警装置包括设置在所述第一端和所述正极之间或所述第二端和所述负极之间的电流通路中的用于执行开关操作的开关装置,当所述开关装置开启时,允许电流流向所述负荷,当所述开关装置关闭时,中断流向所述负荷的电流,当所述检测装置检测到所述接近过放电状态时,所述开关装置执行所述开关操作以便降低所述电流的平均大小,当所述检测装置检测到所述临界状态时,所述开关装置关闭,以停止驱动所述负荷。
2.根据权利要求1所述的电池组,其中所述报警装置指示所述负荷产生所述物理上可察觉印象。
3.根据权利要求2所述的电池组,其中还包括一显示装置,当所述报警装置提醒所述用户给所述电池充电时,该显示装置显示所述电池已经达到所述需要充电状态的警报。
4.根据权利要求1所述的电池组,其中还包括一显示装置,用于在所述检测装置检测到所述临界状态时显示所述电池已经到达所述临界状态的第一报警信号,以及在所述检测装置检测到所述接近过放电状态时显示所述电池已经到达所述接近过放电状态的第二报警信号。
5.根据权利要求1所述的电池组,其中还包括一用于检测所述电池温度的电池温度检测器,当所述电池温度检测器检测到的所述电池温度超过一预定温度时,使所述开关装置关闭。
6.一种电动工具,包括:
一具有第一正极和第一负极的电动机;
一包括多个串联连接的可充电的蓄电池组电池单元的电池,该电池具有与所述第一正极相连的第二正极以及和所述第一负极相连的第二负极,该电池被用作所述电动机的电源;
一用于检测所述第二正极和所述第二负极之间电池电压的电池电压检测器;
检测装置,用于根据所述电池电压检测器所检测的电池电压来检测所述电池是否已经达到表示所述电池需要充电的需要充电状态,当检测到所述需要充电状态时,该检测装置输出一检测信号;
报警装置,用于响应于所述检测信号而提醒用户给所述电池充电,该报警装置给所述用户一物理上可察觉的印象,从而所述用户可以意识到所述电池的需要充电状态,
其中,当所述电池电压检测器检测到的电池电压已经等于或低于第一预定电压时,所述检测装置检测到所述电池已经达到一临界状态,当所述电池电压检测器检测到的电池电压等于或低于第二预定电压但是高于所述第一预定电压时,所述检测装置检测到所述电池已经达到接近过放电状态,所述充电需要状态包括所述接近放电状态和所述临界状态,
其中,所述报警装置包括设置在所述第一正极和所述第二正极之间或所述第一负极端和所述第二负极之间的电流通路中的用于执行开关操作的开关装置,当所述开关装置开启时,允许电流流向所述电动机,当所述开关装置关闭时,中断流向所述电动机的电流,当所述检测装置检测到所述接近过放电状态时,所述开关装置执行所述开关操作以便降低所述电流的平均大小,当所述检测装置检测到所述临界状态时,所述开关装置关闭,以停止所述电动机的转动。
7.根据权利要求6所述的电动工具,其中所述报警装置指示所述电动机产生所述物理上可察觉的印象。
8.根据权利要求7所述的电动工具,其中还包括一显示装置,当所述报警装置提醒所述用户给所述电池充电时,该显示装置显示所述电池已经达到所述需要充电状态的警报。
9.根据权利要求6所述的电动工具,其中还包括一显示装置,用于在所述检测装置检测到所述临界状态时显示所述电池已经到达所述临界状态的第一报警信号,以及在所述检测装置检测到所述接近过放电状态时显示所述电池已经到达所述接近过放电状态的第二报警信号。
10.根据权利要求6所述的电动工具,其中还包括一用于检测所述电池温度的电池温度检测器,当所述电池温度检测器检测到的所述电池温度超过一预定温度时,使所述开关装置关闭。
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JP2001356576A JP2003164066A (ja) | 2001-11-21 | 2001-11-21 | 電池パック |
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-
2001
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2002
- 2002-11-20 DE DE10254223A patent/DE10254223A1/de not_active Ceased
- 2002-11-21 US US10/300,911 patent/US20030096158A1/en not_active Abandoned
- 2002-11-21 CN CNB021515867A patent/CN100492753C/zh not_active Expired - Fee Related
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JP2003164066A (ja) | 2003-06-06 |
US20030096158A1 (en) | 2003-05-22 |
CN1424786A (zh) | 2003-06-18 |
DE10254223A1 (de) | 2003-07-17 |
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