CN1275340C - 具有针型负极接头的二次电池 - Google Patents

具有针型负极接头的二次电池 Download PDF

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CN1275340C
CN1275340C CNB2004100597254A CN200410059725A CN1275340C CN 1275340 C CN1275340 C CN 1275340C CN B2004100597254 A CNB2004100597254 A CN B2004100597254A CN 200410059725 A CN200410059725 A CN 200410059725A CN 1275340 C CN1275340 C CN 1275340C
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申政淳
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Abstract

本发明公开了一种二次电池，包括：电极组件，其通过在正极板和负极板之间插入隔板的方式设置负极板和正极板；和内部安装有电极组件的壳体。将盖组件安装到壳体上以紧密地密封壳体，并使之与正极板电连接。将针插入电极组件中，并使之与负极板和壳体接触，以与负极板和壳体电互连。本发明的二次电池，在电极组件的中心设置了吸收外部挤压力的针，从而可防止电极组件变形。由于通过针可构成通畅的气体通路，内部产生的气体能够顺利地通过安全排气口放出，因此可防止电池爆裂。还可以防止在将电极组件插入壳体的过程中负极接头卡在壳体上，故而能顺利地进行装配。

Description

具有针型负极接头的二次电池
技术领域
本发明涉及一种二次电池，尤其涉及一种用于电极组的负极板的负极接头。
本发明要求享有2003年6月19日向韩国知识产权局提交的申请号为2003-39960的韩国专利申请的优先权，该申请所公开的内容在此作为参考。
背景技术
总体而言，电池大致分为可反复进行充、放电的二次电池和不可再充电在耗尽之后废弃的一次电池。根据目标装置的外形，电池可形成为各种形状，例如筒形、棱柱形和袋形(pouch shape)。
在这些电池中，筒形二次电池具有在把隔板插在正极板和负极板之间的同时以胶卷(jelly-roll)形式卷绕正、负极板的电极组件；内部安装有电极组件的筒形壳体；和固定在壳体顶部的盖组件。
在电极组件和盖组件之间以及在电极组件和壳体之间设置有绝缘板。
电极组件的正极板通过正极接头电连接到盖组件，电极组件的负极板经过负极接头电连接到壳体。
负极接头主要以0.05-0.1mm厚的镍条形成，它焊接到位于电极组件最外区域的负极板和壳体的内部底表面上，以使负极板和壳体电互连。
然而，用作负极接头的镍条是刚性的，当把与负极接头焊接的电极组件插入壳体中时，负极接头易于卡在壳体的开口部分，由此造成电极组件设置异常。
在这种连接中，把电极组件的外部直径设计成：当电极组件插入壳体中时，在它们之间留有一定距离(例如，0.2-0.4mm)。然而，这使电极组件的尺寸受到限制，因此，不能使壳体内的电极组件增大到足以达到最高电池容量。
发明内容
根据本发明一实施方式，该二次电池包括：通过在正极板和负极板之间插入隔板的方式设置负极板和正极板的电极组件；和内部安装有电极组件的壳体。将盖组件安装到壳体上以紧密地密封壳体，并使之与正极板电连接。将针插入电极组件中，并使之与负极板和壳体接触，以使它们电互连。
在一实施方式中，所述针为中空形状，在针的一侧端部形成突出部分，将这些突出部分焊接到壳体上。在此实施方式中，所述突出部分朝针的中心倾斜。
在本发明的另一实施方式中，设置多个突出部分，在突出部分之间设置连通孔，以使针的内部与其外部相通。
在一实施方式中，所述针由镍或镍合金形成。
在另一实施方式中，电极组件基本呈胶卷形状，所述针插入电极组件的中心。
附图说明
通过参照附图对本发明优选实施方式的详细描述，本发明的上述和其它优点将更为明显。附图中：
图1是本发明一实施方式的二次电池的截面图；
图2示出了本发明该实施方式的针结构；
图3是用于本发明该实施方式的二次电池的电极组件的示意性透视图；
图4示出了本发明的针的另一实施方式；
图5示出了本发明的针的又一实施方式。
具体实施方式
下面，参照附图更全面地描述本发明，这些附图示例性地示出了本发明的实施方式。
如图1至3所示，本二次电池具有：在将隔板13插在负极板12和正极板14之间的同时以胶卷形式卷绕负极板12和正极板14而得到的电极组件10；内部安装有电极组件10并使之与电极组件10的负极板12电连接的筒形壳体20；安装到壳体20的顶部并使之与电极组件10的正极板14电连接的盖组件30；以及在接触负极板12的同时插入到电极组件10的中心并且局部焊接到壳体20的底表面上以使电极组件10的负极板12和壳体20电互连的针50。
针50可为中空形状，以便获得气体通路。作为选择，如图4所示，针50也可为实心棒状。
在针50的底端部分形成多个连通孔53，以使针50的内部与其外部相通，并获得用于气体和电解液的通路，当然不是必须形成连通孔(如图5所示)。
在限定所述孔的同时在针50的底端部分、在相邻的连通孔53之间形成多个突出部分52。
突出部分52在与壳体20的底表面接触的同时被焊接到壳体20上，并且所述突出部分朝向针50的中心倾斜。这种结构可以很方便地将突出部分52在一点上焊接到壳体20的底表面。作为选择，如图5所示，可仅在针50的底端部分形成一个突出部分而不形成孔53。
同时，针50可由镍或镍合金构成，和壳体20相比，针50具有优异的导电性和优异的焊接性。
如图3所示，对于电极组件10，从组件的内部到它的外部依次层叠(are tired)负极板12、隔板13、正极板14和隔板13，并卷绕成胶卷形式。
随后，在电极组件10的内部露出负极板12，并使其牢固地与安装在电极组件10中的针50粘合，从而构成对其的电连接。
盖组件30具有盖32和盖罩34，通过将衬垫38插入盖组件和壳体之间而将盖组件安装到壳体20上。在盖32和盖罩34之间设置橡胶排气口36。
将与电极组件10的正极14相连的正极引线15连接到盖组件30的盖罩34上。
在盖组件30和电极组件10之间安装有上部绝缘板40，在壳20的底表面和电极组件10之间安装有下部绝缘板42。
盖组件30、电极组件10和壳体20均采用常规锂离子电池的结构构成，因此，省略对它们的详细说明。
利用上述结构的二次电池，负极接头不安装在电极组件的外部，因此，可以形成具有与壳体内部直径相应的外部直径的电极组件。
因此，利用本发明的二次电池，当电极组件的外部直径是17.10-17.20mm时，和传统的这类电池相比，可以使电极组件的外部直径增加0.5-1.0％，从而使电池容量增加2-5％。
此外，当负极接头不安装在电极组件外部时，可以防止在将电极组件插入壳体的过程中负极接头卡在壳体上，因而能非常顺利地进行装配。
对于传统的这类电池而言，由于电极组件的中心部分是空的，具有很低的强度，因此在外部的挤压下易于变形。相比之下，本发明的二次电池在电极组件的中心设置了针，它能吸收外部挤压力，从而可防止电极组件变形。
此外，对于传统的这类电池而言，当在150℃或温度更高的热炉中对电极组件进行测试时，它的内部结构可能变形，致使内部产生的气体难以通过设置在壳体底部的安全排气口放出，电池容易爆裂。相比之下，本发明的二次电池由于通过针构成了通畅的气体通路，内部产生的气体能够顺利地通过安全排气口放出，因此可防止电池爆裂，符合安全标准。
根据本发明此实施方式的二次电池可以形成为筒形、棱柱形或其它形状。
虽然上面详细描述了本发明的示例性实施方式，但是应当清楚理解，本领域技术人员很容易在此描述的基本发明构思的基础上进行多种改变和/或改型，正如在所附的权利要求书中所限定的那样，这些改变和/或改型均落入本发明的构思和保护范围内。

Claims (8)

1.一种二次电池，包括：
一电极组件，其通过在正极板和负极板之间插入一隔板的方式设置一负极板和一正极板；
一内部安装有所述电极组件的壳体；
一安装到所述壳体上以紧密密封所述壳体并电连接所述正极板的盖组件；以及
一插入所述电极组件中并与所述负极板和所述壳体接触以与所述负极板和所述壳体电互连的针。
2.根据权利要求1所述的二次电池，其中，所述针是中空的。
3.根据权利要求2所述的二次电池，其中，还包括位于所述针的一端并被焊接到所述壳体上的突出部分。
4.根据权利要求3所述的二次电池，其中，所述突出部分朝向所述针的中心倾斜。
5.根据权利要求4所述的二次电池，其中，还包括设置在所述突出部分之间的连通孔，以使针的内部与其外部相通。
6.根据权利要求1所述的二次电池，其中，所述针包括镍或镍合金的至少一种。
7.根据权利要求1所述的二次电池，其中，所述电极组件呈胶卷形状，所述针位于所述电极组件的中心。
8.根据权利要求1所述的二次电池，其中，所述壳体为筒形。
CNB2004100597254A 2003-06-19 2004-06-21 具有针型负极接头的二次电池 Expired - Lifetime CN1275340C (zh)

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