CN102034942A - 蓄电池盖件 - Google Patents
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Abstract
本发明公开了一种蓄电池盖件(10),包括:金属电极端子(40);金属盖件(30),其具有通孔(32)和绝缘树脂件(50),借助于绝缘件使插进通孔的电极端子与盖件整体结合,其中,与绝缘件粘合的电极端子的至少密封区域(70)形成为圆柱形状或椭圆柱形状。
Description
技术领域
本发明涉及一种蓄电池盖件,蓄电池盖件具有盖件,电极端子穿过该盖件,以及,蓄电池盖件密封蓄电池箱的开口。
背景技术
作为用于便携电子装置的电源和用于纯电动车的电源,锂离子蓄电池(secondary battery)近来受到较多关注,锂离子蓄电池具有较高容量、产生较高能量或动力、并且也呈现较高能量密度。
通过将作为发电件的卷绕电极件与无水电解液一起密封在蓄电池箱中构成锂离子蓄电池。顺便提及,如果湿气进入蓄电池箱,湿气将与无水电解液反应,从而生成氟化酸(fluorinated acid)。这样生成的氟化酸侵蚀电极,有时导致蓄电池性能诸如蓄电池容量和蓄电池寿命的劣化。
为此,锂离子蓄电池的蓄电池箱用金属制成,以防止湿气进入蓄电池箱。金属蓄电池箱必须在蓄电池箱的内外之间保持密封性能。这样构造蓄电池箱,利用O形环密封盖件与电极端子(其穿过盖件,以从蓄电池内部伸到外部)之间的间隙。
然而,使用O形环的密封结构需要大量部件,并因此带来有关生产率和成本的问题。为了解决该问题,专利文献1提供了一种蓄电池盖件的建议,利用树脂密封绝缘件使上蓄电池盖与电极端子相结合,从而使上蓄电池盖与电极端子合为一体,从而保证蓄电池内外之间的密封特性。如图8所示,蓄电池盖件110包括盖件130和一对电极端子140,并将插进盖件130所形成的通孔中的这对电极端子140装进模具。用熔融树脂绝缘密封件150填充盖件130与电极端子140之间的间隙,从而,通过嵌件成型使盖件与电极端子成为一体。由于经由树脂绝缘密封件150使盖件130与电极端子140牢固地结合成单件,蓄电池盖件110具有较高的密封特性。
然而,就热胀系数而言,金属与树脂彼此并不相同。所以,在高温或低温环境下,在金属与树脂之间的粘合界面中产生应力,这又削弱了电极端子140与树脂绝缘密封件150的粘合,在树脂绝缘密封件150中引起裂缝,并且不能保证蓄电池盖件110的密封特性。如图8所示,由于蓄电池盖件110的电极端子140呈现矩形截面轮廓,因应力集中所致,拐角特别容易成为裂缝的起点。此外,在为了增强粘合而对电极端子进行表面处理的情况下,当电极端子具有矩形截面时,利用表面处理生成的涂层膜从线状部到角状部有所变化,这使得难以对电极端子与绝缘密封件之间的整个粘合面在整个周面上进行均匀的表面处理。此外,由于粘合区域包括线状部和角状部二者,还引起另一问题,即检查装置的操作比较困难。
专利文献1:JP-A-2008-27823
考虑到上述情况提出本发明,以及,本发明所要迎接的挑战是,提供一种蓄电池盖件,利用相应的绝缘树脂件,使电极端子与盖件整体结合成一体,并在电极件与绝缘树脂件之间呈现良好的粘合。
发明内容
为了解决此问题,本发明提供一种蓄电池盖件,其包括:金属电极端子;金属盖件,具有通孔和绝缘树脂件,借助于绝缘件使插进通孔的电极端子与盖件整体结合,其中与绝缘件粘接的电极端子的至少密封区域形成为圆柱形状或椭圆柱形状。
在本发明的蓄电池盖件中,电极端子优选由一个圆柱杆件通过塑性加工整体成型。电极端子可以具有与电极件相连接的平板状集电极端子、与连接件相连接的平板状外端子、以及连接部,连接部形成为三维屈曲线状,并连接集电极端子与外端子。
在本发明的蓄电池盖件中,与绝缘树脂件相结合的电极端子的粘合区域,形成为在粘合区域的整个外周上具有圆柱或椭圆柱截面轮廓的无角形状。所以,在高温或低温环境下,即使在粘合界面中产生了由于金属的热胀与树脂的热胀之间差异所导致的应力,在本粘合区域的整个外周上也可以均匀地承受此应力。据此,在绝缘件中不会出现裂缝,并呈现优良的密封特性。
此外,电极端子的密封面的整个外周可以经受均匀的表面处理,因此,可以使绝缘件与电极端子或盖件之间的粘合界面更为稳定。
由于检查这种柱形粘合面的粘合状态比较容易,可以提高检查判断的准确性。
本发明的蓄电池盖件的电极端子可以由单个圆柱杆件通过塑性加工整体成型。据此,除了在每个外端子中开设冲压孔之外,不会导致材料废弃。所以,与用平板通过冲压形成现有技术的电极端子相比,本发明的电极端子在材料收益方面可以带来显著改进。
附图说明
图1是说明具有本实施例的蓄电池盖件的蓄电池结构的剖视示意图;
图2是本实施例的蓄电池盖件的轴测图;
图3是沿图2中所示A-A线的剖视图;
图4是沿图3中所示B-B线的剖视图;
图5A和图5B是电极端子的轴测图,而图5C是电极端子的材料的轴测图;
图6是电极端子的变化的轴测图;
图7是具有变化的电极端子的蓄电池盖件的正视图;以及
图8是现有技术的蓄电池盖件的轴测图。
具体实施方式
下面,参照附图,具体说明本发明的实施例。图1是总示意图,图示具有本发明实施例的蓄电池盖件10的锂离子蓄电池1的结构。图2是本实施例的蓄电池盖件10的轴测图,以及,沿A-A线的剖面示于图3中。此外,沿图3中B-B线的剖面示于图4中。
如图1所示,锂离子蓄电池1具有:大致矩形平行六面体的金属箱体2;电极件4,容纳在箱体2中同时平卷;一对电极端子40,与电极件4的两个轴端(图1中所示的左端和右端)相连接;以及,连接件60,在箱体2外部与电极端子40电连接。未示出的电解液保持在箱体2中,并且用电解液浸泡电极件4。
箱体2具有箱型容器本体20和盖件30,容器本体20在其上端具有开口,盖件30安装于开口以密封容器本体20。在盖件30中开设一对端子安装孔32,成对的电极端子40穿过端子安装孔32。
如图3和图4所示,在电极端子40与盖件30之间形成绝缘件50,以便密封端子安装孔32,并紧密接触电极端子40与盖件30,从而使电极端子40与盖件30结合成一体,并形成蓄电池盖件10。
图5(即图5A,5B和5C)示出电极端子40的轴测图。图5A示出作为负极的电极端子40a,而图5B示出作为正极的电极端子40b。电极端子40a和电极端子40b呈现大致相同的状态。电极端子40包括:扁平集电极端子42,使其形成在电极端子的一端、并与电极件4的一端相结合;大致碟状的外端子44,使其形成在电极端子的另一端、并与连接件60相结合;以及,连接部43,其连接集电极端子42与外端子44,并呈现三维屈曲线状。
连接部43包括:第一弯曲43a,自集电极端子42的上端沿盖件30的短边方向大致水平延伸;第二弯曲43b,自第一弯曲43a的端部在大致竖向向上延伸;第三弯曲43c,自第二弯曲43b的端部沿盖件30的长边方向水平延伸;以及,上升部43d,从第三弯曲43c的端部向上延伸,并与外端子44接续。连接部43的各部分之中,第一弯曲43a、第二弯曲43b、以及第三弯曲43c各自具有圆形截面轮廓的柱形形状。第二弯曲43b穿过盖件30的端子安装孔32的中央,以使第二弯曲43b以直角与盖件30相交。
在电极端子40的外端子44的中央开设允许插入连接件60的插入孔44a。连接件60包括柱部60a和头部60b,并且连接件60与外端子44相结合,使得柱部60a向上伸出插入孔44a。此外,在连接件60的头部60b上设置圆筒部64,绝缘件50的凸部50a插入圆筒部64。
如图4所示,绝缘件50整体形成以便密封端子安装孔32,并填充电极端子40的第一弯曲43a和第三弯曲43c与盖件30之间的间隙、以及连接件60与盖件30之间的间隙。具体地,绝缘件50与至少电极端子40的第二弯曲43b的表面、盖件30的上表面30a和下表面30b、以及连接件60的头部60b的表面保持紧密接触。
在如上所述构造的蓄电池盖件10中,电极端子40的至少第二弯曲43b制成圆柱形状。所以,电极端子40与绝缘件50沿着具有圆形截面轮廓的圆柱粘合界面结合在一起,此圆柱粘合界面作为密封区域70。在这种密封结构中,金属与树脂牢固地互相粘合。即使在高温或低温环境下,因为金属的热缩与树脂的热缩之间的差异而产生应力,但密封区域70的整个周围可以均匀地承受应力。据此,就密封特性而言,与易受到因压迫等形成的应力集中影响的有角的电极端子、以及具有矩形截面的电极端子相比,本电极端子更为优越。
通过对如图5C所示作为材料的圆柱金属杆件40’进行塑性加工,可以制造如上所述的本实施例的电极端子40。例如,对加工集电极端子42、外端子44、连接部43的上升部43d的基本要求是辗平杆件40’上的对应区域。此外,除上升部43d之外的连接部43可以通过弯曲连接部43上的对应区域形成。所以,除了在外端子44中开设插入孔44a之外,制造本实施例的电极端子40不会造成材料的废弃。据此,与用平板通过冲压来制造现有技术的电极端子相比时,本电极端子在材料收益方面可以带来显著改进。
除了电极端子40的形式之外,本实施例的蓄电池盖件10可以与现有技术蓄电池盖件相似制成。例如,电极端子40和盖件30可以采用这样的金属,该金属选自由铝、铝合金、铜以及铜合金组成的组。电极端子40和盖件30都可以由一种金属制成,也可以由不同金属制成。对于由这种金属制成的电极端子40的表面和盖件30的表面,进行预定的表面处理,藉此,可以在电极端子和盖件与绝缘件50之间构成优良的粘附界面。
例如,工程塑料,诸如聚苯硫醚(PPS)、聚酰胺(PA)、以及聚对苯二甲酸丁二醇酯(PBT)等,可以用作绝缘件50。工程塑料中可以包含粘合改良剂,如马来酐改性乙烯共聚物(a maleic anhydridemodified ethylene copolymer)。相对于利用三嗪二硫酚复合物或硅烷偶联剂(a triazine dithiol compound or a silane coupling agent.)进行表面处理的电极端子40和盖件30,由于包含粘合改良剂,绝缘件50可以呈现较高的粘附性和较高的密封特性。
例如,这种蓄电池盖件10可以这样制造。首先,利用预定的表面处理剂,对金属制成的电极端子40和盖件30进行表面处理。然后,将经过表面处理的电极端子40置于模具中,同时使其保持插进盖件30的端子安装孔32。接着,将处于熔融状态的树脂成分注射进模具,以进行嵌件成型。
本发明的蓄电池盖件并不局限于以上所述的实施例,而是可以进行变更而不脱离本发明的精神。
例如,在本实施例中,电极端子40的连接部43构造成包括第一弯曲43a、第二弯曲43b、第三弯曲43c、以及上升部43d。然而,连接部也可以构造成图6所示变化的电极端子40c和40d。具体地,电极端子40c和40d以这种方式形成,使得电极端子40a的第二弯曲43b按对应于上升部43d的上升量向上延伸,从而作为第二弯曲43e,并使得水平连接部43f在盖件30的纵向自第二弯曲43e的端部水平延伸,从而连接外端子44。这样制成电极端子,藉此,易于将电极端子40c和40d插进盖件30的端子安装孔32。因此,图7所示的蓄电池盖件12的装配更为容易。
本发明的蓄电池盖适合用做有角密封蓄电池的蓄电池盖件,这种有角密封蓄电池作为便携电子装置的电源和纯电动车的电源。
Claims (6)
1.一种蓄电池盖件,包括:
金属电极端子;
金属盖件,其具有通孔和绝缘树脂件,借助于所述绝缘件使插进所述通孔的所述电极端子与所述盖件整体结合,其中:与所述绝缘件粘接的所述电极端子的至少密封区域形成为圆柱形状或椭圆柱形状。
2.根据权利要求1所述的蓄电池盖件,其中:所述电极端子由一个圆柱杆件通过塑性加工整体成型。
3.根据权利要求2所述的蓄电池盖件,其中:所述电极端子具有与电极件相连接的平板状集电极端子、与连接件相连接的平板状外端子、以及连接部,所述连接部形成为三维屈曲线状,并连接所述集电极端子与所述外端子。
4.根据权利要求1所述的蓄电池盖件,其中:所述绝缘件包括粘合改良剂,以及,所述电极端子和所述盖件用三嗪二硫酚复合物或硅烷偶联剂进行表面处理。
5.根据权利要求1所述的蓄电池盖件,其中:所述蓄电池盖件用于电动车电源的有角密封蓄电池。
6.根据权利要求3所述的蓄电池盖件,其中:在所述连接件上设置圆筒部,所述绝缘件的凸部插进所述圆筒部中。
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