CN106663749A - 具有改进的冷却性能的电池单元 - Google Patents
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Abstract
本发明公开了一种电池单元,其特点是电极堆栈以密封的状态安装在电池壳体中,所述电极堆栈具有这样的结构,所述结构为在隔膜布置在正电极与负电极之间的状态下在以接地为基础的高度方向上堆叠,所述电池壳体形成为具有中空部分的管道形状,并且所述电极堆栈形成为与所述电池壳体的形状相对应的形状。
Description
技术领域
本发明涉及一种具有改进的冷却性能的电池单元(battery cell)。
背景技术
随着移动设备的日益发展以及对于此类移动设备的需求的增长,对于作为移动设备能源的二次电池的需求也在急剧增长。在此类二次电池中,锂二次电池具有高的能量密度和放电电压,针对该电池业已进行了大量的研究,并且该电池现在已经在商业上被广泛使用。
根据电池壳体的形状,二次电池可被分类成具有安装于圆柱形金属罐中的电极堆栈(electrode stack)的圆柱形电池、具有安装于棱柱形金属罐中的电极堆栈的棱柱形电池、或者具有安装于由铝层压板制成的袋状电池壳体中的电极堆栈的袋状电池。由于它们的形状相关特性,圆柱形电池被用在了各种类型的设备中。
通常,安装在圆柱形电池中的电极堆栈充当具有可被充电和放电的正电极/隔膜/负电极堆栈结构的发电元件。安装在圆柱形电池中的电极堆栈被配置成包卷型(jelly-roll type)电极堆栈,所述包卷型电极堆栈被配置成具有这样的结构,在所述结构中,施加有活性材料的长片型正电极和长片型负电极在正电极与负电极之间布置了隔膜的状态下绕着电芯(core)缠绕。
包卷型电极堆栈的优点在于,可以很容易地制造包卷型电极堆栈,并且包卷型电极堆栈的每单位重量的能量密度很高。
然而,如果使用圆柱形电池来制造中型或大型电池,那么很难向外排放在圆柱形电池的中间部分产生的热量。因此,在圆柱形电池被反复充电和放电的时候,圆柱形电池的中间部分会反复升温,其结果是有可能缩短二次电池的寿命。此外,二次电池可能容易着火或爆炸。
由此非常需要具有改进的冷却性能的圆柱形电池。
发明内容
【技术问题】
本发明旨在解决上述问题以及其他尚未解决的技术问题。
本发明的一个目的是提供一种二次电池,其被配置成包括:具有中空结构的电极堆栈,在所述中空结构中从其上端到下端形成有中空部分;以及具有与该电极堆栈的结构相对应的结构的电池壳体,由此顺畅地执行电池单元中的热循环,并且由此极大地提升了冷却效率。
此外,本发明的另一个目的是提供一种二次电池,其被配置成包括:电极堆栈,所述电极堆栈在以接地为基础的竖直方向上延伸,从而使得与每一个电极的区域相比,该电极堆栈在竖直方向上相对较长,以均匀地抑制电极堆栈中的每个电极在每个电极的整个区域上的膨胀;以及电池壳体,所述电池壳体具有与该电极堆栈的结构相对应的结构,由此有效地抑制电极的膨胀,并且由此极大地提升了电池的性能。
【技术方案】
根据本发明的一个方面,上述及其它目标可以通过提供一种具有改进的冷却性能的电池单元来实现,其中该电池单元被配置成具有这样的结构,在该结构中,电极堆栈以密封的状态安装在电池壳体中,所述电极堆栈的结构被配置成正电极和负电极在隔膜分别布置在正电极与负电极之间的状态下在以接地为基础的高度方向上堆叠,所述电池壳体形成为具有中空部分的管道形状,并且电极堆栈被形成为与电池壳体的形状相对应的形状。
由此,冷却剂可以沿电池单元的外部流动并通过电池单元的中空部分,其结果是热循环被顺畅地执行,由此可以有效地从电池移除热量。
在一个具体示例中,电极堆栈可被配置为具有这样的结构,在该结构中,电极堆栈在以接地为基础的高度方向(即长轴)上的长度大于该电极堆栈在与该高度方向垂直的宽度方向(即短轴)上的长度,所述高度方向是电极堆栈的堆叠方向。
也就是说,根据本发明的具有改进的冷却性能的电池单元可被配置成包括:电极堆栈,所述电极堆栈在以接地为基础的竖直方向上延伸,使得与每个电极的区域相比所述电极堆栈在竖直方向上相对较长,从而均匀地抑制了电极堆栈中的每个电极在每个电极的整个区域上的膨胀;以及电池壳体,所述电池壳体具有与电极堆栈的结构相对应的结构。由此,有效抑制了电极的膨胀。
电池单元中的中空部分的大小可以是在考虑了电池单元的体积以及在该电池单元中产生的热量的情况下设定的。举例来说,电池单元的中空部分大小可以是电池壳体的上部截面面积的5%到80%。
电池壳体的材料并没有特别限制,只要电池壳体的材料具有高的导热性和导电性即可。特别地,电池壳体可以使用从选自由不锈钢(SUS)、镍,铜(Cu)以及铝(Al)组成的群组中的任一种制成。
在一个具体示例中,电池单元可被配置成具有这样的结构,在所述结构中,电池壳体在其一个端部处或相对的端部处配备了外部输入/输出端子,所述端子从电池壳体的一个端部或相对的端部处伸出。
在以上的结构中,电池单元可以包括用于将电极堆栈的正电极连接到正电极输入/输出端子的正电极连接构件、以及用于将电极堆栈的负电极连接到负电极输入/输出端子的负电极连接构件。此外,正电极连接构件和负电极连接构件可被布置在电池壳体中。
在这种情况下,正电极连接构件和负电极连接构件被布置在限定在电极堆栈的外部与电池壳体的内部之间的空间中。
在一个具体示例中,正电极连接构件和负电极连接构件可以分别由金属片制成,并且该金属片可被布置在朝着电极堆栈外部的方向上。
此外,电池壳体可以由包括树脂层和金属层的层压片制成。例如,电池壳体可以是由具有高强度和高导电性的金属材料制成的金属壳体。然而,本发明并不局限于此。
也就是说,根据本发明,负电极连接构件根据环境由金属片制成。因此,电池壳体可以用诸如塑料之类的聚合物材料制成。由此,与使用电池壳体作为负电极的常规结构相比,电池壳体可以用诸如聚合物材料之类的绝缘材料制成。其结果是可以形成各种形状的电池壳体,以便降低材料成本以及提高电池壳体的绝缘性。
根据本发明的电极堆栈可以被配置为具有包卷型结构、堆叠型结构、堆叠/折叠型结构或层压/堆叠型结构。
在下文中将会详细描述包卷型结构、堆叠型结构、堆叠/折叠型结构以及层压/堆叠型结构。
首先,包卷型结构的电极堆栈可以通过以下方式制造:对用作集电器(currentcollector)的金属箔涂覆电极材料混合物;干燥和压制金属箔;将金属箔切割成具有预定宽度和长度的带的形式,以形成正电极板和负电极板;在正电极板与负电极板之间布置了隔膜的状态下堆叠正电极板和负电极板;以及以螺旋的方式来缠绕堆叠后的正电极板、隔膜以及负电极板。
层叠型电极堆栈可以通过以下方式制造:对每个金属集电器涂覆电极材料混合物;干燥和压制金属集电器;将金属集电器切割成预定大小,以形成正电极板和负电极板;以及在隔膜布置在正电极板与负电极板之间的状态下堆叠正电极板和负电极板,其中所述隔膜被切割成与正电极板和负电极板相对应的预定大小。
堆叠/折叠型电极堆栈可以通过如下方式制造:折叠两个或更多个单位单元(unitcell),每个单位单元被配置成具有这样的结构,在所述结构中两个或更多个电极板被堆叠成使得正电极和负电极彼此相对;在单位单元没有重叠的状态下或者通过将隔膜弯曲到每个单位单元的大小并将弯曲的隔膜布置在单位单元之间来使用一个或多个隔膜。
层压/堆叠型电极堆栈可以通过如下方式制造:对每个金属集电器涂覆电极材料混合物;干燥和压制金属集电器;将金属集电器切割成预定大小;以及从下方开始按顺序堆叠负电极、隔膜、正电极以及隔膜。
电极堆栈可被配置为具有各种不同形状中的任何一种。举例来说,电极堆栈可被配置成在水平截面中具有圆形、椭圆形或多边形形状。
根据环境,电极堆栈可被配置为在水平截面中具有矩形或正方形形状。
此外,根据本发明的电池单元的类型并没有特别限制,只要将如上所述的电极堆栈安装在电池壳体中即可。在一个具体示例中,电池单元可以是具有很高的能量密度、放电电压以及输出稳定性的锂二次电池。
对于本发明所属领域的普通技术人员来说,包括锂二次电池在内的电池单元的组成、结构和制造方法都是显而易见的,由此,与之相关的详细描述将被省略。
根据本发明的其他方面,所提供了一种包括了一个或多个电池单元的电池组以及一种使用该电池组作为电源的设备。特别地,该设备可以选自由以下各项组成的群组:膝上型计算机、移动电话、便携式显示播放器(PDP)、便携式多媒体播放器(PMP)、MP3播放器、数字静态相机(DSC)、数字视频录像机(DVR)、智能电话、全球定位系统(GPS)、摄录像机、电动车辆、混合动力电动车辆、插入式混合动力电动车辆以及电能存储装置。
上述装置和设备在本发明所属领域中是众所周知的,因此,与之相关的详细描述将被省略。
附图说明
从以下结合附图的详细描述中将会更清楚地理解本发明的上述及其它目标、特征和其它优点,其中:
图1是显示了根据本发明实施例的电池单元的透视图;
图2是沿着图1中的A-B线得到的竖直剖面图;
图3是显示了根据本发明实施例的构成电极堆栈的单位单元的透视图;
图4是显示了根据本发明另一个实施例的电池单元的竖直剖视图;以及
图5是显示了构成图4所示的电极堆栈的单位单元的透视图。
具体实施方式
现在将参考附图来详细描述本发明的例示实施例。然而应该指出的是,本发明的范围不受所示出的实施例的限制。
图1是示意性地显示了根据本发明的实施例的电池单元的透视图,图2是沿图1中的A-B线得到的竖直剖面图,以及图3是示意性地显示了根据本发明的实施例的构成电极堆栈的单位单元的透视图。
参考这些附图,电池单元包括:电极堆栈100,所述电极堆栈100包括多个堆叠的单位单元170;以及电池壳体110,电极堆栈100以密封的状态安装在所述电池壳体110中。
电池壳体110形成为管道的形状,所述管道具有限定在其中间区域的中空部分300。电极堆栈100形成为与电池壳体110的形状相对应的形状。
电极堆栈100形成为具有中空部分300的环状物的截面形状,从而使得电极堆栈100能够容易地插入到电池壳体110中。特别地,电极堆栈100被配置为具有这样的结构,在所述结构中,单位单元170以接地为基础按顺序向上堆叠,每个所述单位单元170包括环状物形状的正电极121、环状物形状的负电极131以及环状物形状的隔膜190。电池壳体110的相对的端部处配备了外部输入/输出端子150和160,所述外部输入/输出端子从电池壳体110的该相对的端部伸出。
用于将电极堆栈100的正电极121连接到正电极输入/输出端子150的正电极引线120以及用于将电极堆栈100的负电极131连接到负电极输入/输出端子160的负电极引线130被提供在限定在电极堆栈100的外部与电池壳体100的内部之间的空间中。特别地,正电极输入/输出端子150提供在中空部分300中。结果是,与不具有中空部分300的电池单元的情况相比,正电极输入/输出端子150与负电极输入/输出端子160之间的形成在电极堆栈100的外部的距离将会减小或是减至最小,由此提升了电池效率。
电极堆栈100的在电极堆栈竖直堆叠的方向上的长度要大于电极堆栈100在以接地为基础的水平方向上的长度。同样地,电池壳体110形成为与电极堆栈100相对应的管道形状,从而使得电极堆栈100能够容易地安装在电池壳体110中。特别地,电池壳体110被配置成具有这样的结构,在所述结构中,高度方向H上的长度为宽度方向W上的长度的大约两倍。中空部分300的大小是电池壳体110的上部截面面积的大约50%。
由于在电极堆栈中形成了中空部分,并且在电池壳体的中间区域也形成了中空部分,因此将会顺畅地执行内部热循环,从而提高冷却效率。因此,即使电池中的电极膨胀,电极的膨胀表面也会相互接触和挤压。此外,电极被限制在大小与电极堆栈的外部相对应的电池壳体中。由此,电极膨胀现象可以得到有效抑制。
图4是显示了根据本发明的另一个实施例的电池单元的竖直剖面图,图5是示意性地显示了构成图4所示的电极堆栈的单位单元的透视图。
除了包括有正电极221、负电极231以及隔膜260的单位单元270被顺序堆叠并且被卷绕以构成安装在电池壳体210中的包卷型电极堆栈之外,图4和5中显示的电池单元在结构上与图1和2中显示的电池单元相同,因此与之相关的详细描述将被省略。
虽然出于示出的目的公开了本发明的示例性实施例,但是本领域技术人员将会了解,在不脱离附加的权利要求书中公开的本发明的范围和精神的情况下,各种修改、补充和替换都是可能的。
【工业实用性】
从以上描述中可以清楚了解,根据本发明的具有改进的冷却性能的电池单元被配置成包括:电极堆栈,所述电极堆栈具有中空结构,在所述中空结构中从其上端到下端形成有中空部分;以及电池壳体,所述电池壳体具有与电极堆栈的结构相对应的结构。由此,电池单元中的热循环将会顺畅地进行,从而极大地提高了冷却效率。
此外,根据本发明的具有改进的冷却性能的电池单元被配置成包括:电极堆栈,所述电极堆栈在以接地为基础的竖直方向上延伸,使得与每个电极的面积相比电极堆栈在竖直方向上相对较长,以便均匀地抑制电极堆栈中的每个电极在每个电极的整个区域上的膨胀;以及电池壳体,所述电池壳体具有与电极堆栈的结构相对应的结构。由此,电极的膨胀会得到有效抑制,从而极大地提高了电池的性能。
Claims (18)
1.一种电池单元,配置成具有如下结构,其中
电极堆栈以密封的状态安装在电池壳体中,所述电极堆栈被配置成具有这样的结构,在所述结构中正电极和负电极在隔膜分别布置在所述正电极与所述负电极之间的状态下在以接地为基础的高度方向上堆叠,
所述电池壳体形成为具有中空部分的管道形状,以及
所述电极堆栈形成为与所述电池壳体的形状相对应的形状。
2.根据权利要求1所述的电池单元,其中所述电极堆栈被配置为具有这样的结构,在所述结构中所述电极堆栈在以接地为基础的高度方向(即长轴)上的长度大于所述电极堆栈在与所述高度方向垂直的宽度方向(即短轴)上的长度,所述高度方向即为所述电极堆栈的堆叠方向。
3.根据权利要求1所述的电池单元,其中所述中空部分的大小是所述电池壳体的上部截面面积的5%到80%。
4.根据权利要求1所述的电池单元,其中电池壳体由选自由不锈钢(SUS)、镍、铜(Cu)以及铝(Al)组成的群组中的任一种制成。
5.根据权利要求1所述的电池单元,其中电池单元被配置成具有这样的结构,在所述结构中所述电池壳体在其一个端部处或相对的端部处配备了外部输入/输出端子,所述外部输入/输出端子从所述电池壳体的一个端部或相对的端部伸出。
6.根据权利要求5所述的电池单元,其中所述电池单元包括用于将所述电极堆栈的所述正电极连接到正电极输入/输出端子的正电极连接构件、以及用于将所述电极堆栈的所述负电极连接到负电极输入/输出端子的负电极连接构件。
7.根据权利要求6所述的电池单元,其中所述正电极连接构件和所述负电极连接构件被布置在所述电池壳体中。
8.根据权利要求7所述的电池单元,其中所述正电极连接构件和所述负电极连接构件被布置在限定在所述电极堆栈的外部与所述电池壳体的内部之间的空间中。
9.根据权利要求8所述的电池单元,其中所述正电极连接构件和所述负电极连接构件分别由金属片制成,并且所述金属片被布置在朝向所述电极堆栈的所述外部的方向上。
10.根据权利要求1所述的电池单元,其中所述电池壳体是用包括树脂层和金属层的层压片制成的。
11.根据权利要求1所述的电池单元,其中所述电池壳体是用金属或塑料制成的。
12.根据权利要求1所述的电池单元,其中所述电极堆栈被配置成具有包卷型结构、堆叠型结构、堆叠/折叠型结构或层压/堆叠型结构。
13.根据权利要求1所述的电池单元,其中所述电极堆栈被配置成在水平截面中具有圆形、椭圆形或多边形形状。
14.根据权利要求1所述的电池单元,其中护套膜附接于所述电池壳体的外部。
15.根据权利要求1所述的电池单元,其中所述电池单元是锂二次电池。
16.一种电池组,包括一个或多个根据权利要求1所述的电池单元。
17.一种设备,所述设备使用根据权利要求16所述的电池组作为电源。
18.根据权利要求17所述的设备,其中该设备选自由以下各项组成的群组:膝上型计算机、移动电话、便携式显示播放器(PDP)、便携式多媒体播放器(PMP)、MP3播放器、数字静态相机(DSC)、数字视频录像机(DVR)、智能电话、全球定位系统(GPS)、摄录像机、电动车辆、混合动力电动车辆、插入式混合动力电动车辆以及电能存储装置。
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US20170229745A1 (en) | 2017-08-10 |
KR20160023038A (ko) | 2016-03-03 |
JP6562565B2 (ja) | 2019-08-21 |
KR102046056B1 (ko) | 2019-11-18 |
US10249919B2 (en) | 2019-04-02 |
JP2017527950A (ja) | 2017-09-21 |
WO2016027991A1 (ko) | 2016-02-25 |
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