CN105845846A - 用于电动工具的电池组 - Google Patents

用于电动工具的电池组 Download PDF

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CN105845846A
CN105845846A CN201610092044.0A CN201610092044A CN105845846A CN 105845846 A CN105845846 A CN 105845846A CN 201610092044 A CN201610092044 A CN 201610092044A CN 105845846 A CN105845846 A CN 105845846A
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battery case
cells
shell
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relief valve
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池田昌树
河合启
鹤田直规
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    • H01M50/233Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
    • H01M50/24Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries from their environment, e.g. from corrosion
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    • H01M50/296Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by terminals of battery packs
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Abstract

用于电动工具(10)的电池组(12)适于以可移除的方式附连到电动工具(10)的工具主体(11)。电池组(12)包括外壳(21)和容纳在外壳(21)中的可充电电池单元(22)。可充电电池单元(22)包括至少一个可充电电池(26)、容纳所述至少一个可充电电池(26)的密封的电池盒(25)以及布置在电池盒(25)上的减压阀(29)。减压阀(29)被配置为当所述至少一个可充电电池(26)产生气体并且在电池盒(25)中积累压力至预定值或更高时打开。

Description

用于电动工具的电池组
技术领域
本发明涉及用于电动工具的电池组。
背景技术
日本专利公开No.2013-191289描述了一种手持式电动工具。该电动工具包括工具主体和电池组,所述工具主体包含电机和控制电路,所述电池组附连到工具主体上以向工具主体供电。
发明内容
电动工具可以在各种气候条件下使用。本发明的发明人进行研究以开发具有改进的防水防尘性能的电池组。通过研究,发明人认识到需要处理从电池组的可充电电池产生的气体。
本公开的目的是提供一种电池组,该电池组包括防水防尘结构,该结构可以处理从可充电电池产生的气体。
本发明的一个方面是用于电动工具的电池组。该电池组适于以可移除的方式附连到电动工具的工具主体上。该电池组包括外壳和容纳在该外壳中的可充电电池单元。该可充电电池单元包括至少一个可充电电池、容纳所述至少一个可充电电池的密封的电池盒、以及布置在电池盒上的减压阀。减压阀被配置为当所述至少一个可充电电池产生气体并且在电池盒内积累压力到达或者超过预定值时打开。
本发明的以上方面改进了防水防尘并防止或减少了从可充电电池产生的气体对电池盒造成的损害。本发明的其他方面和优点由以下结合附图且通过例子来说明本发明的原理的描述将变得明显。
附图说明
通过参考本优选实施例的以下描述和附图可以最好地理解本发明及其目标和优点,其中:
图1为示出了电动工具的一个实施例的示意图;
图2为示出了电池组的结构的分解透视图;以及
图3为示出了所述电池组的结构的分解透视图。
具体实施方式
现将描述用于电动工具的电池组的一个实施例。
图1示出了电动工具10,其为手持式且可充电。电动工具10包括工具主体11和电池组12,电池组12适于以可移除的方式附连到工具主体11上。电池组12为电机和控制电路(未示出)供电,上述二者位于工具主体11内。在非限制的例子中,电动工具10可以是旋转冲击工具。
如图2所示,电池组12包括外壳21、可充电电池单元22、以及电路板23。可充电电池单元22和电路板23容纳在外壳21中。上壳21a和下壳21b彼此一体形成以形成外壳21。端子连接件21x布置在上壳21a的上表面上以将电池组12电连接至工具主体11。端子连接件21x与位于外壳21中的可充电电池单元22和电路板23电连接。外壳21不是气密的。
如图3所示,可充电电池单元22包括电池盒25和可充电电池26。电池盒25包括盒体25a和盖25b。盒体25a包括至少一个入口以允许可充电电池26的插入。盒体25a被形成以容纳可充电电池26。例如,盒体25a可以包括分别对应于可充电电池26的平行布置的线性圆柱孔。盖25b关闭盒体25a的入口。盖25b例如通过螺钉27被牢固地附连到盒体25a。盖25b可以包括粘附在盒体25a的整个入口周围的密封28。盒体25a和盖25b以气密的方式密封电池盒25。盒体25a和盖25b起到防水防尘结构的功能。外壳21和电池盒25配合形成双壁结构。外壳21与电池盒25相比具有较低水平的防水防尘性能。
减压阀29被布置在电池盒25的盒体25a的外表面上,优选为上表面。减压阀29在可充电电池26产生气体时从电池盒25释放气体。减压阀29的释放压力可以通过实验预先确定。
本发明的发明人制造了比较的例子的电池盒以检查减压阀29的有效性。比较的例子的电池盒与所示实施例的电池盒25完全相同,只是省略了减压阀29。在比较的例子中,当可充电电池26产生气体时,压力在电池盒中积累。这可能导致电池盒的损坏,例如破裂。
在本实施例中,气体优先从电池盒25通过减压阀29释放。这避免了电池盒25的损坏,减压阀29除外。优选地,确定减压阀29的释放压力,以便在电池盒25中积累的压力损坏电池盒25之前打开减压阀29。
减压阀29将气体释放到电池盒25与外壳21之间的空间。然后,气体从非气密的外壳21释放到电池组12之外。
减压阀29可以包括阀孔,其位于电池盒25(盒体25a)的外表面中,优选为上表面;以及薄膜,其起到阀构件的功能。该薄膜围绕阀孔被热熔合到电池盒25。该薄膜被配置为压力在电池盒25中积累并达到释放压力时裂开。该薄膜可被称为可撕裂的薄膜。为了方便减压阀29的制造,该薄膜优选地由可热熔合到电池盒25的材料形成。薄膜可以用粘合剂而不是热熔化附连到电池盒25。必要时,该薄膜可以具有局部薄弱结构以精细地调整薄膜的撕裂开始位置和/或撕裂压力(释放压力)。
连接端子30从电池盒25的盒体25a的外表面突出,优选地从上表面突出。连接端子30局部集中并形成连接端子阵列。在非限制的例子中,连接端子阵列是线性的。连接端子30与盒体25a中的可充电电池26电连接。优选地,相邻两个连接端子30之间的间距被设置成当水到达电池盒25时允许水通过的尺寸。优选地,对每个连接端子30进行防水处理,例如施加密封树脂,例如围绕连接端子30的基端。每个连接端子30可为由抗锈的金属或合金形成的端子,例如铝制端子。每个连接端子30的远端部分与电路板23电连接。
电路板23可以包括检测电路,其检测电池状况例如电池组12(可充电电池26)的电压;以及显示电路,其显示检测到的状况。电路板23包括分别对应于可充电电池单元22的连接端子30的插口23a。每个连接端子30电连接到相应的插口23a。每个插口23a可以为通孔。连接端子30插入并焊接至插口23a。电路板23的两个相反的表面分别覆盖有防水片31a和31b。防水片31a和31b封闭整个电路板23以使电路板23免受水和灰尘。这还使连接端子30与插口连接的部分免受水和灰尘。防水片31a和31b起用于电路板23的防水防尘结构的功能。
电路板23和可充电电池单元22容纳在外壳21中。进一步地,电路板23和可充电电池单元22相连接的部分同样受防水防尘结构的保护。因此,即使水或者湿气进入外壳21,在外壳21中例如电路板23或可充电电池单元22的短路的故障被预防或者减少。可充电电池单元22包括提供防水防尘性能的密封的结构以及从可充电电池单元22释放气体的减压阀29。当可充电电池26产生气体并且积累在电池盒25中的压力变得过高时,减压阀29起到防止电池盒25损坏的作用。
现将描述本实施例的优点。
(1)电池组12包括外壳21和容纳在外壳21之内的可充电电池单元22。可充电电池单元22包括至少一个可充电电池26、容纳所述至少一个可充电电池26的密封的电池盒25、以及布置在电池盒25上的减压阀29。减压阀29被配置为当所述至少一个可充电电池26产生气体且在电池盒25中积累压力到预定值(释放压力)或更大时打开。
电池组12改善了防水防尘性能。进一步地,当可充电电池26产生气体时,该气体从电池盒25中释放,同时预防或减少对电池盒25的损害,减压阀29除外。例如,减压阀29可以被修理或者替换以便电池盒25可以重复使用。
(2)电池组12包括容纳在外壳21中的电路板23。可充电电池单元22包括与电路板23电连接的连接端子30,并且连接端子30局部集中并形成连接端子阵列。电池组12容易地实现了用于电连接可充电电池单元22和电路板23的部分的防水防尘结构。
(3)可充电电池26以气密的方式被封装在电池盒25中。电池盒25以非气密的方式被封装在外壳21中。电池组12通过电池盒25的减压阀29和非气密的外壳21将电池盒25中产生的气体释放到电池盒25之外。
(4)在优选的例子中,减压阀包括可撕裂的薄膜,该薄膜起阀构件的功能。该薄膜围绕阀孔被固定到电池盒。减压阀可以通过执行相对简单的热熔化过程来形成。进一步地,可目测该薄膜的撕裂。例如,检查电池组12的人可以目测气体从可充电电池26的产生事件或者产生历史。进一步地,例如,撕裂的薄膜可以被替换以便电池盒25可重复使用。
对于本领域中技术人员应该是明显的,即可以以许多其他具体形式体现本发明而不背离本发明的精神或范围。特别地,应该理解的是本发明可以以下形式体现。
电池盒25可以由具有高散热效果的材料形成。进一步地,电池盒25可以包括散热结构。
可以改变电池盒25的减压阀29的结构。进一步地,可以改变可充电电池单元22(电池盒25)的防水防尘结构以及电路板23的防水防尘结构。
电路板23可以从电池组12中省略。
本发明不限于前述实施例,并且可能对它的部件作出各种变化和改变而不背离本发明的范围。同样地,本实施例中公开的部件可以以任意组合组装以用来体现本发明。例如,一些部件可以从所述实施例中公开的所有部件中省略。进一步地,不同实施例中的部件可以适当地组合。将参考所附权利要求来理解本发明的范围和本发明的等价物。

Claims (7)

1.用于电动工具的电池组,其中所述电池组适于以可移除的方式附连到所述电动工具的工具主体上,所述电池组包括:
外壳;以及
容纳在所述外壳中的可充电电池单元,其中所述可充电电池单元包括:
至少一个可充电电池,
容纳所述至少一个可充电电池的密封的电池盒,以及
布置在所述电池盒上的减压阀,
其中所述减压阀被配置为当所述至少一个可充电电池产生气体并在所述电池盒中积累压力至预定值或者更高时打开。
2.如权利要求1所述的电池组,其进一步包括容纳在所述外壳中的电路板,
其中所述可充电电池单元包括与所述电路板电连接的连接端子,并且所述连接端子局部集中并形成连接端子阵列。
3.如权利要求1所述的电池组,其中所述外壳和所述电池盒形成双壁结构。
4.如权利要求1所述的电池组,其中所述外壳和所述电池盒中的每个具有防水防尘性能,并且所述外壳与所述电池盒相比具有较低水平的防水防尘性能。
5.如权利要求1所述的电池组,其中所述至少一个可充电电池以气密的方式被封装在所述电池盒中,且所述电池盒以非气密的方式被封装在所述外壳中。
6.如权利要求1-5中任一项所述的电池组,其中
所述减压阀包括位于所述电池盒的外表面中的阀孔和围绕所述阀孔固定到所述电池盒的外表面上的可撕裂的薄膜,所述可撕裂的薄膜起阀构件的功能。
7.如权利要求6所述的电池组,其中所述减压阀的所述可撕裂的薄膜围绕所述阀孔被热熔合至所述电池盒的上表面。
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