CN103907220B - 具有提高的生产率的帽组件和包括该帽组件的圆筒形电池 - Google Patents
具有提高的生产率的帽组件和包括该帽组件的圆筒形电池 Download PDFInfo
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Abstract
提供了一种安装在电池罐体的上端开口上的帽组件,该电池具有在圆筒形罐体中内置有电极组件(凝胶卷)的结构,其中该电极组件由正电极、分离膜和负电极构成。根据本发明的帽组件包括:为了安全而连接到电流抑制装置(CID)的安全通气件;沿着安全通气件的外周面而连接到安全通气件的外周面的、突出的上端帽;以及安装在上端帽的外周面上的垫圈。正电极突片焊接到正电极中的未涂覆有正电极活性材料的未涂覆部分。还形成有从垫圈的下端外周面沿向上方向凹进的至少一个凹槽部,从而能够在该电池的制造过程中便于所述CID和正电极突片的焊接。
Description
技术领域
本发明涉及一种具有提高的生产率的帽组件和包括该帽组件的圆筒形电池单体,更具体地,涉及一种安置在电池的圆筒形容器的敞口上端上的帽组件,该电池被构造为具有以下结构:阴极/分离膜/阳极结构的电极组件(凝胶卷)安装在所述圆筒形容器中;所述帽组件包括:为了安全而连接到电流中断装置(CID)的安全通气件;突出的顶帽,该顶帽沿着安全通气件的外周连接到安全通气件;以及垫圈,该垫圈安装在顶帽的外周处,其中,阴极突片通过焊接而附接到阴极的未涂覆有阴极活性材料的未涂覆部分,并且,所述垫圈设置有从垫圈的下端外周向上凹陷的至少一个凹槽,以在制造电池时便于所述CID和阴极突片之间的焊接。
背景技术
随着移动设备的日益发展以及对这种移动设备的需求增加,对二次电池的需求也急剧增加了。在这种二次电池中,锂二次电池具有高的能量密度和工作电压、以及良好的保存和寿命特性,锂二次电池已广泛用作各种电子产品和各种移动设备的能量源。
基于电池外壳的形状,二次电池可以分为:圆筒形电池,其具有安装在圆筒形金属容器中的电极组件;棱形电池,其具有安装在棱形金属容器中的电极组件;或者袋状电池,其具有安装在由铝制层压板形成的袋状外壳中的电极组件。圆筒形电池的优点在于:圆筒形电池具有较大容量并且结构稳定。
安装在电池外壳中的电极组件用作发电元件,具有能够充电和放电的阴极/分离膜/阳极堆叠结构。电极组件可以分为:凝胶卷式电极组件,它被构造为具有以下结构:其中,长片材状的阴极和长片材状的阳极在分离膜布置在阴极和阳极之间的状态下被缠绕,该阴极和阳极上涂布有活性材料;堆叠式电极组件,它被构造为具有以下结构:其中,具有预定尺寸的多个阴极和具有预定尺寸的多个阳极在分离膜分别布置在这些阴极和阳极之间的状态下依次堆叠;或者堆叠/折叠式电极组件,它是凝胶卷式电极组件和堆叠式电极组件的组合。凝胶卷式电极组件的优点在于:凝胶卷式电极组件易于制造并具有高的单位重量能量密度。
与上文相结合,图1中示出了常规圆筒形二次电池的结构。
参考图1,圆筒形二次电池10通常包括:圆筒形容器20;凝胶卷式电极组件30,凝胶卷式电极组件30安装在容器20中;帽组件40,帽组件40联接到容器20的上端;以及压接区域50,帽组件40安装在该压接区域50处。
电极组件30被构造为具有以下结构:其中,阴极31和阳极32在分离膜33布置在阴极31和阳极32之间的状态下被缠绕成凝胶卷形状。连接到帽组件40的阴极突片34附接到阴极31。连接到容器20下端的阳极突片(未示出)附接到阳极32。
同时,锂二次电池的缺点在于:锂二次电池的安全性低。例如,当电池被过度充电到约4.5V或更高时,阴极活性材料将分解,在阳极处出现锂金属的树枝状生长(dendriticgrowth),并且电解质将分解。此时,电池产生热量,导致上述分解反应和若干个副分解反应快速进行,最终,电池可能着火并爆炸。
因此,为了解决上述问题,通常的圆筒形二次电池包括在电极组件和顶帽之间限定的空间内安装的电流中断装置(CID)和安全通气件,以在二次电池发生故障时中断电流并释放内部压力。
具体地,帽组件40包括:构成阴极端子的顶帽41;正温度系数(PTC)元件42,用于在电池的内部温度升高时通过大幅增加电池的电阻来中断电流;安全通气件43,用于在电池的内部压力升高时中断电流和/或排出气体;绝缘构件44,绝缘构件44将安全通气件43除了特定部分之外均与帽板45电气隔离;以及连接到阴极突片34的帽板45,该阴极突片34附接到阴极31。帽组件40构造成具有以下结构:其中,顶帽41、PTC元件42、安全通气件43、绝缘构件44和帽板45被依次堆叠。
压接区域50形成在容器20的上端处,以便帽组件40能够安装到容器20的敞口上端。更具体地,通过如下步骤来形成该压接区域50:对容器20的上端进行卷边以便在容器20的内侧处形成卷边部21;将帽板45的外周、绝缘构件44的外周、安全通气件43的外周和顶帽41的外周依次插入到垫圈60中;然后,弯曲该容器20的上端。结果,压接区域50以包围位于该压接区域50内侧处的垫圈60的形状而形成。通过压接和挤压而将帽组件40安装在压接区域50处。
然而,因为阴极突片34和帽板45之间的焊接在垫圈60的内侧下端处执行,所以,由于该垫圈的下端外周的结构,可能会引起干涉。结果,阴极突片和所述帽板之间的接触可能变差。
另外,当电池跌落或外部冲击施加到电池时,上述凝胶卷可能在特定方向上转动或者上下移动,结果,在阴极突片接触区域处可能发生短路。
因此,非常需要一种技术来根本上解决上述问题。
发明内容
技术问题
因此,为了解决上述问题以及其他尚未解决的技术问题,已经做出了本发明。
具体地,本发明的一个目的是提供一种帽组件,该帽组件能够在确保电池安全性的同时、防止焊接电池的阴极突片时的干涉,由此提高阴极突片的可焊接性。
本发明的另一个目的是提供一种二次电池,该二次电池具有提高的生产率和安全性,且能够用所述帽组件来制造该二次电池。
技术方案
根据本发明的一个方面,能够通过提供如下一种帽组件来实现上述及其它目的,该帽组件安置在电池的圆筒形容器的敞口上端上,该电池被构造为具有以下结构:即,阴极/分离膜/阳极结构的电极组件(凝胶卷)安装在圆筒形容器中;该帽组件包括:为了安全而连接到电流中断装置(CID)的安全通气件;突出的顶帽,该顶帽沿着安全通气件的外周连接到安全通气件;和垫圈,该垫圈安装在顶帽的外周处,其中,阴极突片通过焊接而附接到阴极的未涂覆有阴极活性材料的未涂覆部分,并且,所述垫圈设置有从垫圈的下端外周向上凹陷的至少一个凹槽,以在制造电池时便于所述CID和阴极突片之间的焊接。
如上所述,根据本发明的帽组件包括具有特定结构的凹槽。因此,能够使所述CID和阴极突片之间的焊接期间的、由于垫圈的下端外周而引起的干涉最小化,由此提高了可焊接性。
所述CID和阴极突片之间的连接能够以各种方式实现。在一个优选实例中,阴极突片可通过焊接连接到所述CID的底部。
该阴极突片需要具有预定的柔性,从而,即使在外部冲击(例如,振动)被施加到电池时,也能稳定地维持所述CID和阴极突片之间的连接。可以在阴极突片的至少一部分弯曲的状态下焊接阴极突片,以实现这种柔性。
考虑到这一点,所述凹槽的长度未受到大幅限制,只要在焊接阴极突片时该凹槽不造成干涉即可。例如,该凹槽可以具有0.5mm到1.5mm的长度,优选为0.7mm到1.2mm。
另外,考虑到阴极突片的焊接,该凹槽可以具有1mm的宽度。
同时,所述至少一个凹槽可以包括关于上述垫圈的中心轴线对称的两个或更多凹槽。因此,当阴极突片被焊接时,传感器等可以容易地插入穿过所述凹槽,由此提高焊接效率。
在另一个实例中,所述垫圈还可以包括延伸部,该延伸部从垫圈的下端外周向下延伸,以防止所述凝胶卷的移动。
即,由于所述延伸部和凹槽形成在垫圈的下端外周处,所以,所述凝胶卷的上端被下压,因此能够在振动期间防止所述凝胶卷的转动和上下移动。
在上述结构中,该延伸部可以具有3mm或更小的长度。如果该延伸部的长度太大,则不易于安装帽组件,这不是优选的。另一方面,如果该延伸部的长度太小,则该延伸部难以发挥作用,这也不是优选的。优选地,该延伸部可以具有2mm或更小的长度。
另一方面,可以将向下延伸的该延伸部理解为一种与所述向上凹陷的凹槽相对应的概念。即,所述向上凹陷的凹槽之间的部分可以形成一种向下延伸的延伸部。然而,优选地,考虑到传统垫圈的尺寸,该延伸部和凹槽被构造为具有比传统垫圈更大程度地向下延伸和/或向上凹陷的结构。
该垫圈的材料不受特别限制,只要该垫圈由绝缘材料形成即可。例如,该垫圈可以由电绝缘聚合物树脂或电绝缘聚合化合物形成。具体地,该垫圈可以从由以下项组成的组中选出的至少一种材料形成:聚丙烯(PP)、聚乙烯(PE)、聚对苯二甲酸乙二醇酯(PET)、聚四氟乙烯(PTFE)、热塑性聚酯弹性体(TPEE)和橡胶。
根据本发明的另一个方面,提供了一种圆筒形电池,其包括具有上述结构的帽组件。
该电池可以是能够连续充电和放电的二次电池。例如,该电池可以是锂二次电池。
上文已经参考图1描述了圆筒形电池的基本结构,并且,在本发明所属的领域中,制造该圆筒形电池的方法是众所周知的。因此,将省略该圆筒形电池的详细描述。当然,根据本发明的圆筒形电池也可适用于图1所示的圆筒形电池的任何变体或变型。
附图说明
图1是示出了传统圆筒形二次电池的结构的竖直截面图;
图2是示出了根据本发明的圆筒形二次电池的结构的竖直截面图;
图3是作为一个实例示出了图2的垫圈的截面图;并且
图4是作为另一个实例示出了图2的垫圈的截面图。
具体实施方式
现在,将参考附图来详细描述本发明的优选实施例。然而,应该指出,本发明的范围不限于所图示的实施例。
图2是示出了根据本发明一个实施例的圆筒形二次电池的结构的竖直截面图,而图3是典型地示出了图2的垫圈的截面图。
参考这两幅图,电池100构造为具有以下结构:其中,阴极131/分离膜133/阳极132结构的凝胶卷130安装在圆筒形容器120中,并且帽组件140安置在容器120的敞口上端上。帽组件140包括:安全通气件143,该安全通气件143连接到电流中断装置(CID)145;突出的顶帽141,该顶帽141沿着安全通气件143的外周连接到安全通气件143;和垫圈200,该垫圈200安装在顶帽141的外周处。
阴极突片134通过焊接而附接到阴极131的未涂覆有阴极活性材料的未涂覆部分(未示出)。阴极突片134在阴极突片134弯曲的状态下焊接到CID145的底部。
为了便于CID145和阴极突片134之间的焊接,由聚丙烯(PP)形成的垫圈200设置有凹槽210,该凹槽210具有大约0.8mm的长度,凹槽210从垫圈200的下端外周向上凹陷。
图4是作为本发明的另一个实施例典型地示出了图2的垫圈的截面图。
与图3一起参考图4,除了所述垫圈还包括延伸部之外,图4的垫圈与图3的垫圈相同,因此将省略其详细说明,该延伸部具有大约1.5mm的长度并从垫圈200的下端外周向下延伸,以防止所述凝胶卷的移动。
虽然已出于说明性目的而公开了本发明的优选实施例,但本领域技术人员将会理解,在不偏离权利要求书中限定的本发明的范围和精神的情况下,可以进行各种变型、添加和替换。
工业实用性
从上文的描述中清楚可见,根据本发明的帽组件具有从垫圈的下端外周向上凹陷的凹槽,由此,使电流中断装置(CID)和阴极突片之间的焊接期间的、由于垫圈的下端外周引起的干涉最小化。在优选实例中,还设置有从垫圈的下端外周向下延伸的延伸部以防止所述凝胶卷的移动,由此提高了电池单体的安全性。
Claims (9)
1.一种帽组件,所述帽组件安置在电池的圆筒形容器的敞口上端上,所述电池被构造为具有以下结构:阴极/分离膜/阳极结构的凝胶卷安装在所述圆筒形容器中,所述帽组件包括:
为了安全而连接到电流中断装置的安全通气件;
突出的顶帽,所述顶帽沿着所述安全通气件的外周连接到所述安全通气件;以及
垫圈,所述垫圈安装在所述顶帽的外周处,其中,
阴极突片通过焊接而附接到所述阴极的未涂覆有阴极活性材料的未涂覆部分,并且,所述垫圈设置有从所述垫圈的下端外周向上凹陷的至少一个凹槽,以在制造所述电池时便于所述电流中断装置和所述阴极突片之间的焊接,
其中,所述至少一个凹槽包括关于所述垫圈的中心轴线对称的两个或更多个凹槽。
2.根据权利要求1所述的帽组件,其中,所述阴极突片通过焊接而连接到所述电流中断装置的底部。
3.根据权利要求2所述的帽组件,其中,所述阴极突片在所述阴极突片的至少一部分弯曲的状态下被焊接。
4.根据权利要求1所述的帽组件,其中,所述至少一个凹槽具有0.5mm到1.5mm的长度。
5.根据权利要求1所述的帽组件,其中,所述垫圈还包括延伸部,所述延伸部从所述垫圈的下端外周向下延伸以防止所述凝胶卷的移动。
6.根据权利要求5所述的帽组件,其中,所述延伸部具有3mm或更小的长度。
7.根据权利要求1所述的帽组件,其中,所述垫圈从由以下项组成的组中选出的至少一种材料形成:聚丙烯(PP)、聚乙烯(PE)、聚对苯二甲酸乙二醇酯(PET)、聚四氟乙烯(PTFE)、热塑性聚酯弹性体(TPEE)和橡胶。
8.一种圆筒形电池,其包括根据权利要求1到4、6和7中的任一项所述的帽组件。
9.根据权利要求8所述的圆筒形电池,其中,所述电池是锂二次电池。
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