CN104969377A - 防止水渗透的袋型二次电池 - Google Patents
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Abstract
本发明公开了袋型二次电池。根据本发明的袋型二次电池包含:电极组件,所述电极组件具有通过将隔膜安置在其间而得到的正极板和负极板;和袋型壳,所述袋型壳具有容纳并封装在内部的所述电极组件和电解液,所述袋型壳具有沿其边缘形成的密封部,其中通过焊接能够将水渗透防止构件附着至在袋型壳的边缘处形成的整个密封部。
Description
技术领域
本发明涉及二次电池,更特别地,涉及防止水渗透的袋型二次电池。
本申请要求2013年11月1日在韩国提交的韩国专利申请号10-2013-0132440和2014年10月31日在韩国提交的韩国专利申请号10-2014-0150287的优先权,其公开内容通过参考并入本文中。
背景技术
通常,与一次性原电池截然不同,二次电池是可充电的并且具有广泛的应用,例如包括移动电话、笔记本电脑和便携式摄像机的电子装置,或者电动车辆。特别地,锂二次电池具有高于或等于3.6V的工作电压,并且具有比被广泛用作电子装置电源的镍镉电池或镍氢电池大大约三倍的容量,以及每单位重量的高能量密度,因此其使用呈快速上升的趋势。
锂二次电池分别主要使用锂系氧化物和碳材料作为正极活性材料和负极活性材料。锂二次电池包含:电极组件,所述电极组件包含分别涂布有正极活性材料和负极活性材料的正极板和负极板,隔膜置于所述正极板与负极板之间;和外壳,其在下文中被称为电池壳,所述电池壳被设计为一起密封地接收电极组件和电解液。
基于电池壳的形状,可以将锂二次电池分类为其中将电极组件包埋在金属罐中的罐型二次电池和其中将电极组件包埋在铝层压片的袋中的袋型二次电池。
图1为说明根据现有技术的袋型二次电池的构造的示意图。
参照图1,该袋型二次电池包含壳、电极组件、电极极耳、电极引线和密封部。
壳11包含上袋壳和下袋壳,且可以以足够容纳电极组件12、电极极耳13和电极引线14的尺寸形成,在外侧上,壳11包含通过上壳和下壳的热熔合形成的密封部16。
电极组件12包含正极板、负极板和隔膜。电极组件12可以具有按相继顺序堆叠的正极板和负极板且隔膜置于所述正极板与所述负极板之间。电极组件12代表性地包括例如如下的电极组件:果冻卷(jelly-roll,卷绕状)电极组件,其具有其中将长片型正极和负极在隔膜置于其间的情况下进行卷绕的结构;堆叠型电极组件,其具有其中将切成预定尺寸的多个正极和负极在隔膜置于其间的情况下按相继顺序进行堆叠的结构;和堆叠/折叠型电极组件,其具有其中将包含预定单元的正极和负极的双电池(bicell)或全电池进行折叠的结构,所述正极和负极在隔膜置于其间的情况下进行堆叠。
电极极耳13从电极组件12延伸。例如,正极极耳从正极板延伸,且负极极耳从负极板延伸。在此,当电极组件12包含在彼此的上部堆叠的多个正极板和多个负极板时,电极极耳13从各个正极板和各个负极板延伸。在这种情况下,电极极耳13可以连接至其它部件如电极引线14,同时不直接暴露于壳11的外部。
将电极引线14部分地电连接至分别从正极板或负极板延伸的电极极耳13。即,将正极引线结合且电连接至正极极耳,和将负极引线结合且电连接至负极极耳。另外,可以将绝缘膜15附着至电极引线14的上/下表面的一部分从而增加与电池壳11的密封,并且同时确保电绝缘。
为了制造根据如上所述的现有技术的袋型二次电池,将电极组件放入袋型壳中且然后注入电解液,随后进行诸如密封工序、老化工序和化学转化涂层工序的后处理工序,从而提供完整的二次电池。
通过经由袋型壳的密封工序中的热熔合使上壳与下壳结合或粘合可以沿壳的外周长形成密封部16,优选地,密封部16表示通过热熔合在上壳与下壳的接触区域处形成的一条热熔合层。
图2为说明以横截面观察时的、形成图1的袋型壳的密封部的过程的图。
参照图2,层压片20包含外部树脂层20a、防止材料渗透的屏蔽金属层20b和用于密封的内部树脂层20c,所述外部树脂层20a包含最外部分。
外部树脂层20a用来保护电池免受外部影响,因此需要优异的对厚度的抗张强度和耐候性,且通常广泛使用ONy(弹力尼龙)。屏蔽金属层20b起到防止空气和湿气进入电池的作用,且通常广泛使用铝(Al)。内部树脂层20c用于提供与另一个内部树脂层的密封,且通常广泛使用流延聚丙烯(CPP),通过在包埋电极组件的状态下施加的热和压力而对所述另一个内部树脂层进行热熔合。
多层结构的层压片20具有如下结构,其中内部树脂层20c在密封部中彼此相对,且内部树脂层20c通过热熔合彼此结合。因此,在层压片20结合的端部,内部树脂层20c暴露于外部,且主要由聚合物树脂制成的内部树脂层20c易受水渗透影响,并且存在电解液泄露的可能性,这是长期使用的电池的寿命和稳定性的劣化因素。
发明内容
技术问题
设计了本公开内容以解决以上问题,因此,本公开内容要提供如下的锂二次电池,在所述锂二次电池中将水渗透防止构件附着至在袋壳中形成的密封部从而防止水从外部渗透。
技术方案
为了实现以上目的,根据本公开内容的一方面的袋型二次电池包含:电极组件,所述电极组件包含正极板和负极板以及置于所述正极板与所述负极板之间的隔膜;和袋型壳,所述袋型壳通过将所述电极组件和电解液接收并封装在内部而形成,所述袋型壳具有沿其外周形成的密封部,其中通过焊接将水渗透防止构件附着至沿袋型壳的外周形成的整个密封部。
水渗透防止构件可以形成为在其中水渗透防止构件附着至密封部的端部的宽度方向上比在其中水渗透防止构件附着至密封部的上下部的高度方向上更厚,且所述水渗透防止构件可以通过焊接进行附着。
通过使用具有多个突出部的成型夹具对密封部进行压制可以形成孔,所述水渗透防止构件可以通过焊接填充所述孔并且附着至整个密封部。
所述孔可以沿其中形成电极引线的长度方向形成为四边形形状。
水渗透防止构件可以包含聚对苯二甲酸乙二醇酯(PET)。
水渗透防止构件可以包含选自如下的任一种:硅系、环氧系、氰基丙烯酸系、聚丙烯酸乙烯酯系、乙烯-乙酸乙烯酯系、丙烯酸酯系、聚氯丁二烯系、聚氨酯树脂和聚酯树脂的混合体系、多元醇和聚氨酯树脂的混合体系、丙烯酸类聚合物和聚氨酯树脂的混合体系、聚酰亚胺系、以及氰基丙烯酸酯和氨基甲酸乙酯的混合体系,或其混合物。
水渗透防止构件可以包含环氧系树脂和硅系树脂中的任一种,或其混合物。
有益效果
根据本公开内容的一方面,将水渗透防止构件附着至锂二次电池的袋型壳的密封部,从而防止水从外部渗透并且阻止电池的劣化,引起电池的寿命增加。
另外,使水渗透防止构件形成为在其中水渗透防止构件附着至密封部的端部的宽度方向上比在其中水渗透防止构件附着至密封部的上下部的高度方向上更厚,从而更有效地防止水渗透。
根据本公开内容的另一方面,通过使用具有多个突出部的成型夹具对密封部进行压制而形成孔且通过将膜焊接而对所述孔进行填充,将所述膜附着至密封部,从而更有效地防止水渗透。
另外,将水渗透防止构件如膜附着至锂二次电池的袋型壳的密封部,从而确保密封部的可靠结合。
附图说明
附图说明本公开内容的优选实施方式,并且与上述公开内容一起,用来提供对本公开内容的技术主旨的进一步理解,因此不应将本公开内容解释为限于所述附图。
图1为根据现有技术的袋型二次电池的分解透视图。
图2为说明以横截面观察时的、形成图1的袋型壳的密封部的过程的图。
图3为说明根据本公开内容的示例性实施方式的袋型二次电池的构造的图,所述袋型二次电池具有附着至其的水渗透防止构件。
图4为根据本公开内容的示例性实施方式的密封部的局部横截面图,所述密封部具有附着至其的水渗透防止构件。
图5为根据本公开内容的另一个示例性实施方式的密封部的局部横截面图,所述密封部具有附着至其的水渗透防止构件。
图6为说明用于制造根据本公开内容的示例性实施方式的袋型二次电池的方法的流程图。
具体实施方式
下文中,将参照附图对本公开内容的优选实施方式进行详细描述。描述之前,应该理解的是,在说明书和所附权利要求书中使用的术语不应被解释为限于普通的和字典的意思,而应在允许发明人为了最佳解释而适当地定义术语的原则的基础上,基于对应于本公开内容的技术方面的意思和概念进行解释。因此,在此提出的说明只是仅用于说明目的的优选实施例,不旨在限制公开内容的范围,因此应该理解的是,在不背离公开内容的主旨和范围的情况下可以对其做出其它等价物和修改。
图3为说明根据本公开内容的示例性实施方式的袋型二次电池的构造的图,所述袋型二次电池具有附着至其的水渗透防止构件,且图4为根据本公开内容的示例性实施方式的密封部的局部横截面图,所述密封部具有附着至其的水渗透防止构件。
参照图3和4,根据本公开内容的二次电池包含壳110a和110b、电极组件120、电极极耳130、电极引线140、密封部160和附着至密封部的水渗透防止构件170。
所述壳包含通过热熔合工序而沿外围区域密封的上袋壳110a和下袋壳110b,从而在内部接收电极组件。在这种情况下,所述袋壳可以为铝层压片。在将电极组件120安装在对应于上袋壳110a与下袋壳110b之间的接收部分的位置处后,通过经由热熔合工序使袋壳的外围区域热熔合而进行密封工序。
电极组件120包含正极板、负极板和隔膜。即,电极组件120具有在隔膜插入其间的情况下按相继顺序堆叠的正极板和负极板,且所述正极板与所述负极板彼此电绝缘。根据实施方式,可以以多种结构例如卷绕型、堆叠型或堆叠/折叠型形成电极组件120。
正极板包含由具有高导电性的金属薄板例如铝(Al)箔制成的正极集电器,以及涂布在正极集电器的两个表面上的正极活性材料层。正极板可以具有其中在两侧上没有形成正极活性材料层的正极集电器区域,即无正极涂层的部分。在无正极涂层的部分的一个端部,正极板可以与由金属例如铝(Al)制成的正极极耳结合。
负极板包含由导电金属薄板例如铜(Cu)箔制成的负极集电器,以及涂布在负极集电器的两个表面上的负极活性材料层。负极板可以具有其中在两侧上没有形成负极活性材料层的负极集电器区域,即无负极涂层的部分。在一个端部,负极板可以与由金属例如镍(Ni)制成的负极极耳结合。与正极板类似,基于电极组件120的类型,可以至少包含两个负极板,特别地,在堆叠型电极组件的情况下,可以包含多个负极板。
将隔膜设置在正极板与负极板之间从而使正极板与负极板电绝缘,且所述隔膜可以由正极板与负极板之间的多孔膜形成从而允许锂离子经由其穿过。隔膜可以由使用例如聚乙烯(PE)或聚丙烯(PP)的多孔膜或其复合膜制成。
电极极耳130从电极组件120延伸。电极极耳130不直接暴露于壳110a和110b的外部,且可以连接至其它部件如电极引线140。
电极引线140电连接至电极极耳130。电极引线140的一个端部连接至电极极耳130,且另一个端部暴露于壳110a和110b的外部,并且暴露于外部的另一个端部可以起到电极端子的作用。因此,可以将电极引线140的另一个端部连接至充电器或负载从而对二次电池进行充/放电。另外,可以将绝缘膜150附着至电极引线140的上/下表面的一部分从而增加与电池壳的密封,同时确保电绝缘。
通过经由例如在袋型壳的密封工序中的热熔合使上袋壳110a与下袋壳110b结合或附着,可以沿袋的外周形成密封部160。然而,当通过密封工序形成密封部160但未很好地实现结合时,水可能会经密封部160从外部进入,且即使当少量的水渗入电池时,也会加速电池的劣化,存在爆炸的风险且电池的寿命降低。
因此,如在图4中所示,本公开内容使水渗透防止构件170沿袋壳的整个外周与密封部160附着从而防止水渗透。在这种情况下,通过焊接方法(例如超声波焊接、激光焊接等)可以将水渗透防止构件170附着至密封部160的端部和沿袋壳的外周形成密封部160的上下表面。
具体地,因为水渗透是通过在其中上袋壳110a和下袋壳110b于形成密封部160的热融合工序期间彼此结合的内部树脂层中的裂缝而发生,所以附着至沿袋壳的外周形成的密封部160的水渗透防止构件170在其中水渗透防止构件170附着至密封部160的端部的宽度方向W上比在其中水渗透防止构件170附着至密封部160的上下部的高度方向H上更厚,且优选在远远超出水能够从外部渗透的距离处形成。
在这种情况下,水渗透防止构件170可以为例如聚对苯二甲酸乙二醇酯(PET)的膜,聚对苯二甲酸乙二醇酯(PET)为可通过对苯二甲酸和乙二醇的缩聚获得的饱和聚酯,并且受温度和湿度的影响较小且具有差的吸水特性。水渗透防止构件170不限于此,且可以包括能够防止水渗透的任何材料。具体地,水渗透防止构件170可以包括用于粘合剂、密封剂和防水剂的材料,例如为选自如下的任一种:硅系、环氧系、氰基丙烯酸系、聚丙烯酸乙烯酯系、乙烯-乙酸乙烯酯系、丙烯酸酯系、聚氯丁二烯系、聚氨酯树脂和聚酯树脂的混合体系、多元醇和聚氨酯树脂的混合体系、丙烯酸类聚合物和聚氨酯树脂的混合体系、聚酰亚胺系、以及氰基丙烯酸酯和氨基甲酸乙酯的混合体系,或其混合物。优选地,水渗透防止构件170可以单独或以组合方式包含环氧系树脂和硅系树脂。另外,通过图5的实施方式说明了用于逐步防止水渗透的结构。
图5为根据另一个示例性实施方式的密封部的局部横截面图,所述密封部具有附着至其的水渗透防止构件,且在密封部160中形成了孔510,并且所述孔510填充有水渗透防止构件170。这种结构用于防止通过裂缝发生的水渗透,所述裂缝是由附着至密封部160的端部的水渗透防止构件170中的破裂而生成。
通过使用具有多个突出部的成型夹具对沿袋壳的外周形成的密封部160进行压制而形成孔510。在这种情况下,孔510优选在其中形成电极引线的长度方向上伸长。在这种情况下,尽管本公开内容的示例性实施方式描述孔510以四边形形状形成从而用作屏蔽膜,但本公开内容不限于此,且可以采用能够防止水从外部渗透的任何形状。
随后,通过焊接使水渗透防止构件170填充在孔510中,且通过焊接使水渗透防止构件170附着至沿袋壳的外周形成的整个密封部160,因此,即使水通过由附着至密封部160的端部的水渗透防止构件170中的破裂而生成的裂缝进行渗透,也通过填充在孔510中的水渗透防止构件而逐步将水切断,从而更有效地防止水从外部渗透。
另外,通过将水渗透防止构件如膜附着至锂二次电池的袋型壳的密封部,可以确保密封部的可靠的结合。
图6为说明用于制造根据本公开内容的示例性实施方式的袋型二次电池的方法的流程图。参照图6,为了制造根据本公开内容的示例性实施方式的袋型二次电池,首先,准备了如下:袋壳,所述袋壳包含上袋壳110a和下袋壳110b;和电极组件120,所述电极组件120包含正极板和负极板,隔膜置于所述正极板与负极板之间。
随后,将电极组件120接收在袋壳中,且在上袋壳110a和下袋壳110b上进行热熔合从而形成密封部160(S610)(S630)。
将水渗透防止构件170附着至密封部160的端部和沿袋壳的外周形成的密封部160的上下表面。在这种情况下,通过焊接方法(例如超声波焊接、激光焊接等)可以将水渗透防止构件170附着至密封部160(S650)。
具体地,因为水渗透是通过在其中上袋壳110a和下袋壳110b于形成密封部160的热融合工序期间彼此结合的内部树脂层中的裂缝而发生,所以附着至沿袋壳的外周形成的密封部160的水渗透防止构件170在其中水渗透防止构件170附着至密封部160的端部的宽度方向W上比在其中水渗透防止构件170附着至密封部160的上下部的高度方向H上更厚,且优选以比水能够从外部渗透的距离更大的厚度形成。
在这种情况下,水渗透防止构件170可以为例如聚对苯二甲酸乙二醇酯(PET)的膜,聚对苯二甲酸乙二醇酯(PET)为可通过对苯二甲酸和乙二醇的缩聚获得的饱和聚酯,并且受温度和湿度的影响较小且具有差的吸水特性。水渗透防止构件170不限于此,且可以包括能够防止水渗透的任何材料。具体地,水渗透防止构件170可以包括用于粘合剂、密封剂和防水剂的材料,例如为选自如下的任一种:硅系、环氧系、氰基丙烯酸系、聚丙烯酸乙烯酯系、乙烯-乙酸乙烯酯系、丙烯酸酯系、聚氯丁二烯系、聚氨酯树脂和聚酯树脂的混合体系、多元醇和聚氨酯树脂的混合体系、丙烯酸类聚合物和聚氨酯树脂的混合体系、聚酰亚胺系、以及氰基丙烯酸酯和氨基甲酸乙酯的混合体系,或其混合物。优选地,水渗透防止构件170可以单独或以组合方式包含环氧系树脂和硅系树脂。
另外,即使水渗透,为了逐步切断水,也可以在将水渗透防止构件170附着至密封部160之前形成孔。
即,在通过热融合形成密封部160和在密封部160中形成孔510之后,利用水渗透防止构件170对在密封部160中形成的孔510进行填充从而更有效地防止水从外部渗透。
例如,通过使用具有多个突出部的成型夹具对沿袋壳的外周形成的密封部160进行压制而形成孔510,且孔510优选在其中形成电极引线的长度方向上伸长。在这种情况下,尽管本公开内容的示例性实施方式描述孔510以四边形形状形成从而用作屏蔽膜,但本公开内容不限于此,且可以采用能够防止水从外部渗透的任何形状。
随后,通过焊接使水渗透防止构件170填充在孔510中,且通过焊接使水渗透防止构件170附着至沿袋壳的外周形成的整个密封部160,由此,即使水通过由附着至密封部160的端部的水渗透防止构件170中的破裂而生成的裂缝进行渗透,也通过填充在孔510中的水渗透防止构件逐步将水切断,从而更有效地防止水从外部渗透。
尽管已经结合有限数量的实施方式和附图对本公开内容进行了说明,但本公开内容不限于此,且应该理解,在本公开内容和与所附权利要求的等价物的主旨和范围内,本领域技术人员可以做出多种变化和修改。
Claims (7)
1.一种袋型二次电池,其包含:
电极组件,所述电极组件包含正极板和负极板以及置于所述正极板与所述负极板之间的隔膜;和
袋型壳,所述袋型壳通过将所述电极组件和电解液接收并封装在内部而形成,所述袋型壳具有沿其外周形成的密封部,
其中水渗透防止构件通过焊接而附着至沿所述袋型壳的外周形成的整个密封部。
2.根据权利要求1所述的袋型二次电池,其中所述水渗透防止构件形成为在其中所述水渗透防止构件附着至所述密封部的端部的宽度方向上比在其中所述水渗透防止构件附着至所述密封部的上下部的高度方向上更厚,且所述水渗透防止构件通过焊接而附着。
3.根据权利要求1所述的袋型二次电池,其中通过使用具有多个突出部的成型夹具对密封部进行压制而形成了孔,且所述水渗透防止构件通过焊接填充所述孔并且附着至所述整个密封部。
4.根据权利要求3所述的袋型二次电池,其中所述孔沿形成电极引线的长度方向以四边形形状形成。
5.根据权利要求1所述的袋型二次电池,其中所述水渗透防止构件包含聚对苯二甲酸乙二醇酯(PET)。
6.根据权利要求1所述的袋型二次电池,其中所述水渗透防止构件包含选自如下的任一种:硅系、环氧系、氰基丙烯酸系、聚丙烯酸乙烯酯系、乙烯-乙酸乙烯酯系、丙烯酸酯系、聚氯丁二烯系、聚氨酯树脂和聚酯树脂的混合体系、多元醇和聚氨酯树脂的混合体系、丙烯酸类聚合物和聚氨酯树脂的混合体系、聚酰亚胺系、以及氰基丙烯酸酯和氨基甲酸乙酯的混合体系,或其混合物。
7.根据权利要求1所述的袋型二次电池,其中所述水渗透防止构件包含环氧系树脂和硅系树脂中的任一种、或其混合物。
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KR20130132440 | 2013-11-01 | ||
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KR1020140150287A KR20150051178A (ko) | 2013-11-01 | 2014-10-31 | 수분 침투를 방지할 수 있는 파우치형 이차전지 |
PCT/KR2014/010395 WO2015065124A1 (ko) | 2013-11-01 | 2014-10-31 | 수분 침투를 방지할 수 있는 파우치형 이차전지 |
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US9564616B2 (en) * | 2014-03-28 | 2017-02-07 | Intel Corporation | Shielding layer of battery cell structure |
KR101858314B1 (ko) * | 2015-03-27 | 2018-06-28 | 주식회사 엘지화학 | 이차 전지용 파우치 외장재 및 이를 포함하는 파우치형 이차 전지 |
KR102114242B1 (ko) * | 2016-03-29 | 2020-05-25 | 주식회사 엘지화학 | 파우치형 이차전지 및 파우치형 이차전지의 제조방법 |
KR102663216B1 (ko) * | 2016-12-13 | 2024-05-02 | 현대자동차주식회사 | 배터리 구조 |
KR102391311B1 (ko) | 2017-07-07 | 2022-04-26 | 엘지디스플레이 주식회사 | 필름 스피커 및 이를 포함하는 표시 장치 |
US10511059B1 (en) * | 2018-11-15 | 2019-12-17 | ZAF Energy Systems, Incorporated | Alkaline pouch cell with coated terminals |
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CN1702885A (zh) * | 2001-06-20 | 2005-11-30 | 大日本印刷株式会社 | 电池用包装材料 |
KR20070091877A (ko) * | 2006-03-08 | 2007-09-12 | 주식회사 엘지화학 | 밀봉성이 향상된 이차전지 |
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KR20100071814A (ko) * | 2008-12-19 | 2010-06-29 | 주식회사 엘지화학 | 이차전지용 파우치 및 파우치형 이차전지 |
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CN1702885A (zh) * | 2001-06-20 | 2005-11-30 | 大日本印刷株式会社 | 电池用包装材料 |
KR20070091877A (ko) * | 2006-03-08 | 2007-09-12 | 주식회사 엘지화학 | 밀봉성이 향상된 이차전지 |
JP2007265879A (ja) * | 2006-03-29 | 2007-10-11 | Nec Lamilion Energy Ltd | フィルム外装電気デバイスおよび電気デバイス集合体 |
KR20100071814A (ko) * | 2008-12-19 | 2010-06-29 | 주식회사 엘지화학 | 이차전지용 파우치 및 파우치형 이차전지 |
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