CN102593407B - 堆叠或堆叠/折叠型电极组件及包括其的电化学电池 - Google Patents
堆叠或堆叠/折叠型电极组件及包括其的电化学电池 Download PDFInfo
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Abstract
在此公开一种阴极/分隔板/阳极结构的堆叠或堆叠/折叠型电极组件,其中所述电极组件被构造为如下结构,在该结构中,从构成电极组件的电极板中突出有其中未采用活性材料的接头(电极接头),所述电极接头电连接至电极导片,并且在电极导片-电极接头联结部分处,多个电极接头联结至电极导片的顶部和底部,使得在电极之间在电极导片-电极接头联结部分的阻抗差异被最小化。还公开了一种包括所述电极组件的电化学电池。
Description
本申请是申请日为2007年7月21日、名称为“具有在电极之间存在最小阻抗差异的接头-导片联结部分的电极组件以及包含该电极组件的电化学电池”的第200780028332.9号发明专利申请的分案申请。
技术领域
本发明涉及一种在电极之间具有最小阻抗差异的接头-导片(lead)联结部分的电极组件,更具体而言,涉及一种阴极/分隔板/阳极的堆叠或堆叠/折叠型电极组件,其中所述电极组件被构造为如下结构,在该结构中,从构成电极组件的电极板突出有其中未采用活性材料的接头(电极接头),所述电极接头电连接至电极导片,并且在电极导片-电极接头联结部分处,多个电极接头联结至电极导片的顶部和底部,使得在电极之间在电极导片-电极接头联结部分处的阻抗差异被最小化。
背景技术
随着移动设备的日益发展以及对此类移动设备的需求不断增加,电池作为用于移动设备的能源,其需求也急剧增大。而且,针对满足各种需求的电池,已经进行了大量研究。
就电池的形状而言,对于方形二次电池或袋形二次电池的需求非常高,所述方形二次电池或袋形二次电池薄得足以应用于诸如移动电话的产品。另一方面,就电池的材料而言,对于锂二次电池的需求非常高,所述锂二次电池例如为锂离子电池和锂离子聚合物电池,具有高能量密度、高放电电压和高输出稳定性。
而且,二次电池可基于具有阴极/分隔板/阳极结构的电极组件的构造进行分类。例如,电极组件可被构造为凝胶卷(卷绕)型结构,在该结构中,在阴极和阳极之间相应设置分隔板的同时,卷绕长板型阴极和长板型阳极;堆叠型结构,在该结构中,在阴极和阳极之间相应设置分隔板的同时,依次堆叠多个具有预定尺寸的阴极和阳极;或者堆叠/折叠型结构,在该结构中,在阴极和阳极之间相应设置分隔板的同时,依次堆叠多个具有预定尺寸的阴极和阳极,以构建双电池或全电池,然后卷绕该双电池或全电池。
图1是典型地示出一种传统的有代表性的堆叠型电极组件的总体结构的侧视图。
参考图1,堆叠型电极组件10被构造为如下结构,在该结构中,在阴极20和阳极30之间相应设置分隔板70的同时,依次堆叠阴极20和阳极30,每个阴极20具有应用于阴极集电器21的相对主表面上的阴极活性材料22,每个阳极30具有应用于阳极集电器31的相对主表面上的阳极活性材料32。
从阴极集电器21和阳极集电器31的一侧末端突出有多个阴极接头41和阳极接头51,所述多个阴极接头41和阳极接头51上未采用活性材料,使得阴极接头41和阳极接头51电连接至构成电池电极终端的阴极导片60和阳极导片(未示出)。阴极接头41和阳极接头51以聚集状态联结,然后各自连接至阴极导片60和阳极导片。在图2和图3中更加清晰地示出这种结构,图2和图3是典型示出在阴极接头和阴极导片之间的联结部分的局部放大图。为便于描述,图2和图3仅示出在阴极接头和阴极导片之间的联结部分,尽管该结构还应用于在阳极接头和阳极导片之间的联结部分。
参考这些附图,将阴极接头40沿箭头所指方向拉近彼此紧密接触,并连接至阴极导片60。阴极导片60通过熔焊被正常联结至阴极接头。如图2中所示,在阴极导片60位于最上方阴极接头41顶部的同时,阴极导片60可联结到阴极接头。替代性地,如图3中所示,在阴极导片60位于最下方阴极接头42底部的同时,阴极导片60可联结到阴极接头。
然而,由于这种联结结构,在电极组件中会出现相对于每个电极导片在电极之间的阻抗差异。具体而言,与电极导片距离最短的电极接头的电极阻抗不同于与电极导片距离最长的电极接头的电极阻抗。在包括带有如上所述构造的电极组件的中型或大型电池组中,大容量的电极被充电和放电。因此,由于在所述电极之间的阻抗差异,所述电极可能不一致地运行或变差,这会降低电池的寿命。
而且,当在上述结构中将电极接头联结到电极导片时,仅沿着一个方向执行用于联结电极接头和电极导片的熔焊过程,导致在电极接头和电极导片之间的联结力可能降低。
因此,对于电极组件而言非常需要具有如下改进结构,在该结构中,在使电极之间的阻抗差异最小化的同时,增大在电极接头和电极导片之间的联结力。
发明内容
因此,本发明致力于解决上述问题以及亟待解决的其他技术问题。
具体而言,本发明的一个目的在于,提供一种具有如下结构的电极组件,在该结构中电极之间的阻抗差异被最小化。
本发明的另一目的在于,提供一种具有如下结构的电极组件,在该结构中在电极接头和每个电极导片之间的联结力被增大,从而确保高度可靠性。
本发明的再一目的在于,提供一种包括所述电极组件的电化学电池。
附图说明
从下文结合附图的详细说明,可更加清晰地理解本发明的上述和其他目的、特征以及其他优点,其中:
图1是图示一种传统的堆叠型电极组件的总体结构的概况图;
图2和图3是图示在图1中示出的电极组件的阴极接头和阴极导片之间的连接的局部放大图,所述阴极接头以聚集状态彼此联结;以及
图4是图示根据本发明一优选实施方案的电极组件的阴极接头和阴极导片之间的连接的局部放大图,所述阴极接头以聚集状态彼此联结。
具体实施方式
根据本发明的一方面,可通过提供一种阴极/分隔板/阳极结构的堆叠或堆叠/折叠型电极组件实现上述和其他目的,其中所述电极组件被构造为如下结构,在该结构中,从构成电极组件的电极板突出有其上未采用活性材料的接头(电极接头),该电极接头被电连接至电极导片,并且在电极导片-电极接头联结部分,多个电极接头联结至电极导片(electrodelead)的顶部和底部,使得在电极之间在电极导片-电极接头联结部分处的阻抗差异被最小化。
在一优选实施方案中,联结到电极导片顶部的电极接头的数目约等于联结到电极导片底部的电极接头的数目,使得电极接头以近似对称的方式联结到电极导片。具体而言,当总计A个电极接头联结到电极导片的顶部时,相同数目的电极接头(即,总计A个电极接头)或者相似数目的电极接头(即,总计A’个电极接头)可被联结到电极导片的底部。
将参考图4更加详细地描述该结构。参考图4,电极接头200被联结至电极导片100,同时在电极导片100的顶部110布置三个电极接头210,并且在电极导片100的底部120布置三个电极接头220。因此,在联结区域A,电极接头200以对称结构设置在电极导片100上,在该对称结构中,电极接头200被对称设置在电极导片100的顶部110和底部120。
沿着箭头所指方向,电极接头200被拉近彼此紧密接触,同时在电极接头200之间设置电极导片100,然后通过熔焊将电极导片100联结到电极接头200。视情况而定,可将电极导片100插入到电极接头200之间,同时所述电极接头彼此紧密接触,然后可通过熔焊将电极导片100联结至电极接头200。
根据本发明,并不具体限制所述电极导片,只要所述电极导片由可电连接至电极接头的材料制成。优选的是,电极导片由金属板制成。所述金属板可选自如下组,该组包括铝板、铜板、镍板、涂覆以镍的铜板以及SUS板。
而且,并不具体限制所述电极导片,只要所述电极导片被构造为如下结构,在该结构中电极导片易于连接至电极接头。例如,电极导片可形成为在垂直截面中呈直线的形状。所述电极导片可以多种方式连接至电极接头。优选的是,通过熔焊将所述电极导片更加稳定地连接至电极接头。所述熔焊可包括超声波焊、激光焊和阻焊。
根据本发明的另一方面,提供了一种包含带有上述构造的电极组件的电化学电池。
所述电化学电池是一种通过电化学反应来供电的电池。例如,所述电化学电池可以是一种电化学二次电池或者电化学电容器。具体而言,所述电化学电池优选应用于锂二次电池。
所述二次电池包括可被充电和放电的电极组件。优选的是,所述二次电池被构造为如下结构,在该结构中电极组件以密封状态安装在电池壳中,所述电池壳由包括金属层和树脂层的层压片制成。具有上述结构的二次电池可被称为袋形二次电池。
而且,所述二次电池优选用作用于高输出大容量电池组的单元电池。
在下文中,将更加详细地描述本发明的实施例。然而,应注意的是,本发明的范围并不限于所示出的实施例。
[实施例1]
包含锂的阴极活性材料和包含石墨的阳极活性材料被各自应用于铝箔和铜箔的相对主表面,然后所述铝箔和铜箔被切割以制造具有未采用活性材料的电极接头的阴极板和阳极板。然后,在所述阴极板和所述阳极板之间相应设置分隔板的同时,依次堆叠所述阴极板和阳极板。在此之后,如图4中所示,在所述阴极接头之间设置阴极导片的同时,将阴极导片熔焊至阴极接头,并且在所述阳极接头之间设置阳极导片的同时,将阳极导片熔焊至阳极接头,从而制造电极组件。
[比较实施例1]
如图3中所示,以与实施例1相同的方法制造电极组件,不同之处在于,所述阴极导片熔焊至阴极接头,同时所述阴极导片位于最下方阴极接头的底部之处,并且阳极导片熔焊至阳极接头,同时所述阳极导片位于最下方阳极接头的底部之处。
[实验例1]
针对分别根据实施例1和比较实施例1所制造的20个电极组件,执行阻抗测量试验。在下表1中示出试验结果。在相应的20个电极组件上重复执行所述试验。使用安捷伦毫欧表测量在阴极接头和阴极导片之间联结部分之处的阻抗。在下表1中,测量得到的试验值表示为平均阻抗值。
下表1的组A表示位于电极组件上部的阴极接头。对于实施例1,组A表示位于阴极导片顶部的阴极接头。对于比较例1,组A表示与阴极导片相距长距离的阴极接头。下表1的组B表示位于电极组件下部的阴极接头。对于实施例1,组B表示位于电极导片底部的阴极接头。对于比较实施例1,组B表示与阴极导片相距短距离的阴极接头。
<表1>
如上表1可见,在根据实施例1制造的电极组件中,位于阴极导片顶部的阴极接头的阻抗约等于位于阴极导片底部的阴极接头的阻抗。具体而言,并非在所有阴极处均发生阻抗差异。另一方面,在根据比较例1制造的电极组件中,在与阴极导片相距短距离的阴极接头和与阴极导片相距长距离的阴极接头之间出现阻抗差异。即使所述阻抗差异非常微小,在电极组件的重复充电和放电期间或者在具有大量电流的高输出大容量电池组中,所述阻抗差异仍会导致电极之间的运行不一致。特别地,在电极组件的长期使用期间,所述阻抗差异导致具体电极组件的迅速损坏,从而导致电池寿命降低。
工业应用
从上文描述显见,根据本发明的电极组件具有如下效果。所述电极组件被构造为如下结构,在该结构中在电极之间的阻抗差异被最小化。而且,所述电极组件被构造为如下结构,在该结构中在电极接头和每个电极导片之间的联结力增大,从而确保高度可靠性。
尽管已经出于示例性目的公开了本发明的优选实施方案,但本领域的普通技术人员将意识到,在不偏离在所附权利要求中所公开的本发明的范围和主旨的情况下,可以进行各种修改、添加和替换。
Claims (9)
1.一种阴极/分隔板/阳极结构的堆叠或堆叠/折叠型电极组件,其中所述电极组件被构造为如下结构,在该结构中,从构成电极组件的电极板中突出有其中未采用活性材料的电极接头,所述电极接头电连接至电极导片,并且在电极导片-电极接头联结部分处,多个电极接头联结至电极导片的顶部和底部,
其中所述电极导片在所述电极导片-电极接头联结部分处在没有任何其他构件支撑的情况下通过熔焊被直接联结至所述电极接头;以及
其中所述堆叠/折叠型是被构造成如下的一种结构,在该结构中,在阴极和阳极之间相应设置分隔板的同时,依次堆叠多个阴极和阳极,以构建双电池或全电池,然后卷绕该双电池或全电池;
其中连接至所述电极导片的顶部的电极接头在电极导片-电极接头联结部分处的平均阻抗为5.32毫欧,连接至所述电极导片的底部的电极接头在电极导片-电极接头联结部分处的平均阻抗为5.31毫欧。
2.根据权利要求1所述的电极组件,其中联结到电极导片的顶部的电极接头的数目等于联结到所述电极导片的底部的电极接头的数目。
3.根据权利要求1所述的电极组件,其中所述电极导片由金属板制成。
4.根据权利要求3所述的电极组件,其中所述金属板选自如下组,该组包括铝板、铜板、镍板、涂覆有镍的铜板和不锈钢板。
5.根据权利要求1所述的电极组件,其中所述电极导片被形成为在竖直截面中呈直线的形状。
6.一种包括根据权利要求1到5中任一权利要求所述的电极组件的电化学电池。
7.根据权利要求6所述的电化学电池,其中所述电化学电池是二次电池。
8.根据权利要求7所述的电化学电池,其中所述二次电池被构造为如下结构,在该结构中电极组件以密封状态安装在电池壳中,所述电池壳由包括金属层和树脂层的层压片制成。
9.一种包括根据权利要求1到5中任一权利要求所述的电极组件的电容器。
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JP4890795B2 (ja) * | 2005-06-16 | 2012-03-07 | 日本電気株式会社 | フィルム外装電池及びそれが集合した組電池 |
US8088516B2 (en) * | 2005-11-18 | 2012-01-03 | Acme Aerospace, Inc. | Storage battery electrodes with integral conductors |
JP5086566B2 (ja) * | 2006-06-13 | 2012-11-28 | 本田技研工業株式会社 | 蓄電素子 |
KR100888284B1 (ko) | 2006-07-24 | 2009-03-10 | 주식회사 엘지화학 | 탭-리드 결합부의 전극간 저항차를 최소화한 전극조립체 및이를 포함하고 있는 전기화학 셀 |
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2006
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- 2007-07-21 WO PCT/KR2007/003530 patent/WO2008013381A1/en active Application Filing
- 2007-07-21 CN CNA2007800283329A patent/CN101496217A/zh active Pending
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CN1532961A (zh) * | 2003-03-21 | 2004-09-29 | �����ǵ��ӹɷ�����˾ | 锂离子二次电池 |
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CN101496217A (zh) | 2009-07-29 |
US20090317717A1 (en) | 2009-12-24 |
KR20080009353A (ko) | 2008-01-29 |
JP5782642B2 (ja) | 2015-09-24 |
JP2008027894A (ja) | 2008-02-07 |
KR100888284B1 (ko) | 2009-03-10 |
JP2011165672A (ja) | 2011-08-25 |
JP2011155015A (ja) | 2011-08-11 |
CN102593407A (zh) | 2012-07-18 |
US10026944B2 (en) | 2018-07-17 |
US20150380717A1 (en) | 2015-12-31 |
US9246154B2 (en) | 2016-01-26 |
WO2008013381A1 (en) | 2008-01-31 |
US20100248030A1 (en) | 2010-09-30 |
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