CN103733411B - 具有提高的生产率的果冻卷芯和包括该果冻卷芯的电池单元 - Google Patents
具有提高的生产率的果冻卷芯和包括该果冻卷芯的电池单元 Download PDFInfo
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Abstract
本发明涉及一种用于二次电池的果冻卷芯,该果冻卷芯通过卷绕阴极片/分隔物/阳极片来构造,其中,利用焊接方法,电极接片在电极片上附接到未施加有电极活性材料的未涂覆部分,并且在电极接片上沿着面对未涂覆部分的方向形成突出的浮凸结构从而改善可焊接性。
Description
技术领域
本发明涉及一种呈现提高的生产率的果冻卷芯和一种包括该果冻卷芯的电池单元,并且更具体地,涉及一种用于通过卷绕阴极片、分隔物和阳极片构造的二次电池的果冻卷芯,其中,电极接片通过焊接而连接到电极片的未施加有电极活性材料的未涂覆部分,并且电极接片中的每一个被构造为具有朝向未涂覆部分突出的浮凸结构以改善可焊接性。
背景技术
随着移动装置得到日益发展,并且对于这种移动装置的需求已经增加,所以对于二次电池的需求也已经急剧地增加。在这种二次电池中,锂二次电池呈现高的能量密度和操作电压以及优良的环境保护和使用寿命特性,该锂二次电池已经广泛用作用于各种电子产品以及移动装置的能量源。
基于电池壳体的形状,二次电池可以被分类成具有安装在圆柱形金属容器中的电极组件的圆柱形电池、具有安装在棱柱形金属容器中的电极组件的棱柱形电池或者具有安装在由铝层压片形成的袋形壳体中的电极组件的袋形电池。圆柱形电池具有如下优点,即,圆柱形电池具有较大的容量并且是结构稳定的。
安装在电池壳体中的电极组件用作发电元件,该发电元件具有能够充电和放电的阴极/分隔物/阳极堆叠结构。该电极组件可以分类成果冻卷式电极组件、堆叠式电极组件和堆叠/折叠式电极组件,该果冻卷式电极组件构造为具有在分隔物布置在阴极和阳极之间的状态下将施加有活性材料的长片式阴极和长片式阳极进行卷绕的结构,该堆叠式电极组件构造为具有在分隔物分别地布置在阴极和阳极之间的状态下具有预定尺寸的多个阴极和具有预定尺寸的多个阳极顺序地堆叠的结构,该堆叠/折叠式电极组件是果冻卷式电极组件和堆叠式电极组件的组合。
在这方面,在图1中示出常规圆柱形二次电池的结构。
参考图1,通过在电池壳体130中安装果冻卷式(卷绕式)电极组件120、将电解质注入到电池壳体130中和将具有电极端子(例如,未示出的阴极端子)的帽组件140联接到电池壳体130的敞开的上端而制造圆柱形二次电池100。
电极组件120被构造为具有如下结构,其中在分隔物123布置在阴极片121和阳极片122之间的状态下,阴极片121和阳极片122卷绕成圆形。圆柱形中央销150装配在电极组件120的芯部(果冻卷芯的中央)中。中央销150通常由金属材料制成以呈现预定强度。中央销150被构造为具有通过卷绕片式材料形成的中空圆柱形结构。中央销150用于固定并且支撑电极组件。而且,中央销150用作通道以排出当二次电池充电和放电时和当操作二次电池时由二次电池的内部反应产生的气体。
被构造为具有片式结构的绝缘部件160安装在电极组件120的上端处。绝缘部件160在其中央处设有与中央销150的通孔151连通的开口,能够通过该开口排出气体并且能够通过该开口将电极组件120的阴极接片142连接到帽组件140的帽板145。
此外,绝缘部件170布置在圆柱形二次电池100的下端处。绝缘部件170位于电极组件120的下端和电池壳体130之间。绝缘部件170在其中央处设有开口,通过该开口,附接到阳极片122的阳极接片(未示出)连接到电池壳体130的下端。
阴极接片和阳极接片通常通过超声波焊接而连接到阴极片和阳极片的未涂覆部分(电极片的未施加有电极活性材料的部分,即金属集电器)。
具体地,在图2的截面图中典型地示出在阴极片和阴极接片之间的超声波焊接。
参考图2,阴极接片142布置在阴极片的未涂覆部分121a上与阴极片的未涂覆部分121a接触,并且阴极接片142被包括多个焊头(horn tip)310的超声波焊接装置300挤压。此时,超声波振动传递到阴极接片142,并且利用由于超声波振动产生的摩擦热,阴极接片142被焊接到阴极片的未涂覆部分121a。
然而,阴极接片和阴极片是扁平的,结果当在焊头与阴极接片接触的状态下执行超声波焊接时,阴极接片可被磨损。而且,要求在阴极接片和阴极片之间的高度联接,并且因此,在焊接期间基于高能超声波(high ultrasonic wave)的施加,电极活性材料可能从阴极片分离。
因此,根本上解决以上问题的技术是非常必要的。
发明内容
技术问题
因此,已经实现本发明用于解决以上问题和尚待解决的其它技术问题。
本发明的一个目的在于提供一种在每一个电极接片处形成浮凸结构的果冻卷芯,从而在超声波焊接期间防止电极接片的磨损并且改善可焊接性。
本发明的另一个目的在于提供一种使用带有提高的生产率和安全性的果冻卷芯的二次电池。
技术方案
根据本发明的一个方面,能够通过提供一种通过卷绕阴极片、分隔物和阳极片构造的二次电池而实现以上和其它目的,其中,电极接片通过焊接而连接到电极片的未施加有电极活性材料的未涂覆部分,并且电极接片中的每一个被构造为具有朝向未涂覆部分突出的浮凸结构以改善可焊接性。
即,在根据本发明的果冻卷芯处形成如上所述的浮凸结构。因此,当与对于扁平电极接片执行焊接的常规结构比较时,尽管在焊接期间振动能级降低,但是在电极接片(具体地,具有浮凸结构的部分)和电极片的未涂覆部分之间实现了高摩擦,由此改善在电极接片和未涂覆部分之间的可焊接性。
电极接片可以由铝或者镍制成。例如,阴极接片可以由铝制成,并且阳极接片可以由镍制成;然而,本发明不限于此。
在优选实例中,该浮凸结构可以包括构造为具有如下结构的多个微突起,该结构具有在其面对未涂覆部分的一侧处形成的突出部和在其另一侧处形成从而对应于该突起的凹入部。
突出部和凹入部的形状不受特别限制。优选地,突出部和凹入部以半球的形状形成。
优选地,微突起中的每一个具有50到500微米的突出高度。如果突出高度太高,则在电极接片和未涂覆部分之间的焊接不易实现,这不是优选的。在另一方面,如果突出高度太高,则浮凸结构难以发挥作用,这也不是优选的。更优选地,微突起中的每一个具有100到150微米的突出高度。
同时,电极接片优选地通过超声波焊接而连接到未涂覆部分,以使焊接部分的变形最小化并且对于薄的未涂覆部分实现容易的施加。
具体地,超声波焊接可以由如下焊接装置执行,该焊接装置包括以与浮凸结构的微突起对应间隔布置的焊头。
因此,焊接由与微突起对应的焊头执行,由此使在电极接片和未涂覆部分之间的可焊接性最大化。
此外,可以通过在焊头位于各个微突起的凹入部中的状态下施加超声波来执行超声波焊接。
在常规的超声波焊接中,有必要使得与电极接片接触的焊头中的每一个的高度为约350微米,从而从焊头产生的振动能量能够有效地传递到电极片的与电极接片接触的相应的表面。然而,其高度较高的焊头可容易地受到损坏。另外,电极接片可以被焊头磨损。
根据本发明,在另一方面,突出部形成在电极接片的与电极接片的焊头位于其中的凹入部对应的区域处,即在电极接片的面对未涂覆部分的区域处,并且因此,仅通过减小焊头中的每一个的高度便提供高可焊接性是可能的。因此,解决问题诸如电极接片磨损是可能的。
具体地,焊头中的每一个优选地具有50到300微米的高度,更优选地约100微米的高度。
同时,焊头320中的每一个可以具有60到120度的角度。优选地,焊头中的每一个以具有90度的角度的角锥体的形状形成。
根据本发明的另一个方面,提供一种制造果冻卷芯的方法。具体地,制造果冻卷芯的方法包括:(a)在分隔物布置在阴极片和阳极片之间的状态下卷绕阴极片和阳极片,(b)在阴极片和阳极片的未涂覆部分上定位均具有在其表面处形成的浮凸结构的电极接片,从而浮凸结构的突出部面对未涂覆部分中的对应的未涂覆部分,和(c)在电极接片中的每一个的浮凸结构的凹入部中定位焊接装置的焊头,并且向凹入部施加超声波。
即,使用对应于浮凸结构的焊头执行超声波焊接,由此使电极接片的磨损最小化并且改善在电极接片和未涂覆部分之间的可焊接性。
根据本发明的另一个方面,提供一种包括该果冻卷芯的电池单元,其中,该果冻卷芯安装在电池壳体中。
该电池单元是能够连续地充电和放电的二次电池。电池单元可以被以各种形式诸如棱柱形电池和圆柱形电池单元构造。优选地,该电池单元是圆柱形电池单元。
此外,优选地,利用优良的可焊接性该电池单元应用于如下具有高功率和大容量的中型或者大型电池模块,该电池模块的包括多个电池单元作为单元电池。
中型或者大型电池模块的结构及其制造方法在本发明所属的技术领域中是众所周知的,并且将省略其详细说明。
有益效果
如根据以上说明清楚地,根据本发明的果冻卷芯具有朝向未涂覆部分突出的浮凸结构。因此,使电极接片的磨损最小化并且改善可焊接性是可能的,由此改善电池单元的安全性。
附图说明
与附图相结合,将根据以下详细说明更清楚地理解本发明的以上和其它目的、特征和其它优点,在附图中:
图1是示出常规圆柱形二次电池的竖直截面透视图;
图2是示出在图1的阴极片和阴极接片之间的焊接的局部截面图;
图3是示出根据本发明的一个实施例在阴极片和阴极接片之间的焊接的局部截面图;
图4是以焊接装置的局部侧视图地示出根据本发明的焊接装置的前视图;并且
图5是示出图3的电极接片的一部分的照片。
具体实施方式
现在,将参考附图详细描述本发明的优选实施例。然而,应该指出,本发明的范围不受示意的实施例限制。
图3是示出根据本发明的一个实施例的在阴极片和阴极接片之间的焊接的局部截面图,图4是以焊接装置的局部侧视图示出图3的焊接装置的前视图,并且图5是示出图3的电极接片的一部分的照片。
与图1一起地参考这些图,通过卷绕阴极片121、分隔物123和阳极片122来构造用于二次电池的果冻卷芯120。由镍材料制成的阴极接片200通过超声波焊接而连接到阴极片121的未施加有电极活性材料的未涂覆部分121a。阴极接片200被构造为具有朝向未涂覆部分121a突出的浮凸结构以改善可焊接性。
该浮凸结构包括构造为具有如下结构的多个微突起210,即,该结构具有在其面对未涂覆部分121a的一侧处形成的突出部212和在其另一侧处形成从而对应于突起212的凹入部214。
微突起210中的每一个具有约120微米的突出高度H。
同时,超声波焊接由焊接装置300执行,该焊接装置300包括以与浮凸结构的微突起210对应的间隔布置的焊头320。
焊接装置300包括以3×9矩阵布置的焊头320。焊头320中的每一个具有约100微米的高度L。而且,焊头320中的每一个被以具有90度的角度R的角锥体的形状形成。
通过在焊头位于各个微突起210的凹入部214中的状态下施加超声波来执行超声波焊接。因此,即使在使用每一个具有低的高度的焊头320的情形中仍然使电极接片的磨损最小化是可能的。
可以以相同的方式关于由铝材料制成的阳极接片执行这种超声波焊接。
虽然已经为了示意性的意图公开了本发明的优选实施例,但是本领域技术人员可以理解,在不脱离如在本发明的所附权利要求中公开的范围和精神的情况下,各种变型、添加和替代都是可能的。
Claims (5)
1.一种制造果冻卷芯的方法,所述方法包括:
(a)在分隔物布置在阴极片和阳极片之间的状态下卷绕所述阴极片和所述阳极片;
(b)将每一个均在其表面处形成有浮凸结构的电极接片定位在所述阴极片和所述阳极片的未涂覆部分上,使得所述浮凸结构的突出部面对所述未涂覆部分中的对应的未涂覆部分;和
(c)将焊接装置的焊头定位在所述电极接片中的每一个的所述浮凸结构的凹入部中,并且向所述凹入部施加超声波。
2.根据权利要求1所述的方法,其中,所述电极接片由铝或者镍制成。
3.根据权利要求1所述的方法,其中,所述浮凸结构包括多个微突起,所述微突起被构造为具有如下结构,所述结构具有在其面对所述未涂覆部分的一侧处形成的所述突出部和在其另一侧处形成从而对应于所述突起的所述凹入部。
4.根据权利要求3所述的方法,其中,所述微突起中的每一个具有50到500微米的突出高度。
5.根据权利要求3所述的方法,其中,所述微突起中的每一个具有100到150微米的突出高度。
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KR1020110080477A KR101381674B1 (ko) | 2011-08-12 | 2011-08-12 | 제조공정성이 향상된 젤리-롤 및 이를 포함하는 전지셀 |
PCT/KR2012/006076 WO2013024984A2 (ko) | 2011-08-12 | 2012-07-31 | 제조공정성이 향상된 젤리-롤 및 이를 포함하는 전지셀 |
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WO2013024984A2 (ko) | 2013-02-21 |
TW201320437A (zh) | 2013-05-16 |
US20160301060A1 (en) | 2016-10-13 |
WO2013024984A3 (ko) | 2013-05-30 |
KR20130017817A (ko) | 2013-02-20 |
JP5952402B2 (ja) | 2016-07-13 |
CN103733411A (zh) | 2014-04-16 |
TWI459609B (zh) | 2014-11-01 |
US10079380B2 (en) | 2018-09-18 |
EP2733778B1 (en) | 2016-08-10 |
MY174934A (en) | 2020-05-24 |
US20140147716A1 (en) | 2014-05-29 |
EP2733778A2 (en) | 2014-05-21 |
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JP2014529165A (ja) | 2014-10-30 |
EP2733778A4 (en) | 2014-07-09 |
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