CN102299271A - 一种圆柱型锂离子动力电池 - Google Patents

一种圆柱型锂离子动力电池 Download PDF

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CN102299271A
CN102299271A CN2011102104961A CN201110210496A CN102299271A CN 102299271 A CN102299271 A CN 102299271A CN 2011102104961 A CN2011102104961 A CN 2011102104961A CN 201110210496 A CN201110210496 A CN 201110210496A CN 102299271 A CN102299271 A CN 102299271A
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徐德雷
国海超
魏银仓
张兵
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Zhuhai Silver Dragon New Energy Ltd By Share Ltd
Yinlong New Energy Co Ltd
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Abstract

本发明公开了一种圆柱型锂离子动力电池，其包括圆柱形外壳、正极盖板、负极盖板、正极极柱、负极极柱、中心管及电芯，正极盖板和负极盖板分别固定安装在外壳的两端，正极极柱和负极极柱分别设于该正极盖板和该负极盖板上，中心管位于外壳内，其两端分别与正极极柱和负极极柱连接，电芯包括负极片、隔离膜和正极片，该负极片、该隔离膜和该正极片依次卷绕在中心管上；在负极盖板上设有通孔，并在该通孔内密封焊接有负极陶瓷环，负极极柱穿设于该负极陶瓷环的中心孔内并与负极陶瓷环密封焊接。本发明利用陶瓷环隔离负极盖板和负极柱，陶瓷环焊接后可达到真空密封性，大大提高了电池密封的可靠性，保证了电池长时间使用的安全性；而且其使用寿命长。

Description

一种圆柱型锂离子动力电池
技术领域
本发明涉及锂离子电池，尤其是一种圆柱型锂离子动力电池。
背景技术
圆柱形锂离子动力电池由于具有能量密度高、比功率大、循环性能好、无记忆效应、无污染等特点，被广泛应用于笔记本电池、电动工具、电动自行车和电动车等。现有圆柱型锂离子动力电池主要由圆柱形外壳、正极盖板、负极盖板、正极极柱、负极极柱、中心管及电芯组成，正极盖板和负极盖板分别固定安装在外壳的两端，在正极盖板和负极盖板上均设有通孔，正极极柱和负极极柱分别穿设于该正极盖板和该负极盖板上的通孔内，中心管位于外壳内，其两端分别与正极极柱和负极极柱连接，电芯包括负极片、隔离膜和正极片，该负极片、该隔离膜和该正极片依次卷绕在所述中心管上，且该正极片和该负极片分别经正极极耳和负极极耳与正极极柱和负极极柱电连接。为了隔开正、负极，防止短路，在负极极柱与负极盖板之间装配有塑胶等密封材料制成的密封件，其存在如下缺陷：（1）塑胶密封件在装配时易造成隐性损坏，而且在长时间高温状态下易发生变形失效，致使电池在长时间使用中出现漏液问题；（2）塑料密封件不耐高温，易老化，使用时间短。
发明内容
本发明的目的在于克服现有圆柱型锂离子动力电池存在的上述缺陷，提供一种安全性高、使用寿命长的圆柱型锂离子动力电池。
为了实现上述目的，本发明提供的一种圆柱型锂离子动力电池，其包括圆柱形外壳、正极盖板、负极盖板、正极极柱、负极极柱、中心管及电芯，所述正极盖板和所述负极盖板分别固定安装在所述外壳的两端，所述正极极柱和所述负极极柱分别设于该正极盖板和该负极盖板上，所述中心管位于外壳内，其两端分别与所述正极极柱和所述负极极柱连接，所述电芯包括负极片、隔离膜和正极片，该负极片、该隔离膜和该正极片依次卷绕在所述中心管上，且该正极片和该负极片分别经正极极耳和负极极耳与所述正极极柱和所述负极极柱电连接；在所述负极盖板上设有通孔，并在该通孔内密封焊接有负极陶瓷环，所述负极极柱穿设于该负极陶瓷环的中心孔内并与负极陶瓷环密封焊接。
作为上述技术方案的优选实施例，所述负极陶瓷环与所述负极极柱和所述负极盖板的焊接方式为钎焊。
作为上述技术方案的优选实施例，在所述正极盖板上设有通孔，并在该通孔内密封焊接有正极陶瓷环，所述正极极柱穿设于该正极陶瓷环的中心孔内并与正极陶瓷环密封焊接。
作为上述技术方案的优选实施例，所述正极陶瓷环与所述正极极柱和所述正极盖板的焊接方式也为钎焊。
作为上述技术方案的优选实施例，所述正极盖板与所述正极极柱一体成型。
作为上述技术方案的优选实施例，在所述正极极柱和所述负极极柱的外端面上设有螺孔。
作为上述技术方案的优选实施例，所述正极盖板及所述负极盖板与所述外壳分别通过焊接固定连接。
作为上述技术方案的优选实施例，所述中心管包括金属上中心管、金属下中心管及连接在该上中心管与该下中心管之间的耐高温绝缘套管。
作为上述技术方案的优选实施例，在所述外壳内的所述负极极柱和所述正极极柱的外部分别套装有负极抱箍和正极抱箍，所述负极极耳和所述正极极耳的一端分别焊接在所述负极极柱与所述负极抱箍之间和所述正极极柱与所述正极抱箍之间。
作为上述技术方案的优选实施例，所述负极极耳与所述负极极柱和所述负极抱箍的焊接方式为激光焊，所述正极极耳与所述正极极柱和所述正极抱箍的焊接方式为激光焊。
与现有技术相比，本发明具有以下有益效果：
（1）本发明的圆柱型锂离子动力电池，其利用陶瓷环隔开正、负极，陶瓷环与负极（正极）盖板和负极（正极）极柱密封焊接，焊缝致密，焊接后可达到真空密封性，可以有效隔开电芯内的电解液，从而避免了电池在长时间使用中漏液问题，因此安全性高；而且，陶瓷环具有良好的耐高温性，电池长时间工作在高温状态下也不会导致其变形失效，使用寿命长，有效避免了塑胶等密封材料不耐高温、易老化的问题。
（2）本发明的圆柱型锂离子动力电池，在正极极柱和负极极柱的外端面上设有螺孔，便于电池之间的串并联装配。
（3）本发明的圆柱型锂离子动力电池，其中心管采用分段结构，中段为耐高温绝缘套管。由于中心管中心位置的热量一般较大，本发明利用套管把热量隔开，使得电池内部的热量可以均匀的向正、负电极柱传导，大大降低了电池内部发热不均衡的问题，可满足电池长时间、高倍率充放电状态下稳定工作。
附图说明
图1是本发明实施例1的结构示意图；
图2是沿图1中A-A线的剖视图；
图3是本发明实施例2的结构示意图。
附图标记说明：1、外壳；2、负极盖板；3、正极盖板；4、负极陶瓷环；5、正极陶瓷环；6、负极极柱；6a、螺孔；7、正极极柱；7a、螺孔；8、负极抱箍；9、正极抱箍；10、负极极耳； 11、正极极耳；12、上中心管；13、套管；14、下中心管；15、电芯。
具体实施方式
下面结合附图对本发明的实施例进行详细说明：
本发明的其中一个实施例如图1、2所示，圆柱型锂离子动力电池主要由外壳1、正极盖板3、负极盖板2、负极陶瓷环4、正极陶瓷环5、正极极柱7、负极极柱6、中心管及电芯15组成，其中，外壳1呈圆柱形，其材质为铝或铝合金。正极盖板3和负极盖板2的材质也为铝或铝合金，其分别焊接在外壳1的两端，在该正极盖板3和该负极盖板2的中部设有通孔。负极陶瓷环4和正极陶瓷环5分别采用钎焊密封焊接在负极盖板2和正极盖板3的通孔内。负极极柱6和正极极柱7分别穿设于负极陶瓷环4和正极陶瓷环5的中心孔内，并与负极陶瓷环4和正极陶瓷环5采用钎焊密封焊接在一起。这样，由外壳1、负极盖板2、正极盖板3、负极陶瓷环4、正极陶瓷环5、负极极柱6及正极极柱7形成一个真空密封腔室，电芯15封装于该腔室内，避免了电池长时间使用中出现电解液渗漏的问题；而且，由于陶瓷具有良好的耐高温性，可以使电池长时间工作在高温状态下也不会导致其变形失效，有效避免了塑胶等密封材料不耐高温、易老化的问题。
在负极极柱6和正极极柱7的外端面上设有螺孔6a、7a，便于电池之间的串并联装配。
中心管设于外壳1内，其由上中心管12、套管13及下中心管14组成，上中心管12和下中心管14的材质为铝或铝合金，上中心管12和下中心管14的一端分别套装在负极极柱6和正极极柱7的内端，上中心管12和下中心管14的另一端分别套装在套管13的两端。套管13采用耐高温绝缘材质制成。由于中心管中心位置的热量一般较大，本实施例利用套管13把热量隔开，使得电池内部的热量可以均匀的向正、负电极柱传导，大大降低了电池内部发热不均衡的问题，可满足电池长时间、高倍率充放电状态下稳定工作。
电芯15包括负极片、隔离膜、正极片和电解液，该负极片、该隔离膜和该正极片依次卷绕在中心管上。负极片一端延伸出的负极集流体卷绕形成负极极耳10，该负极极耳10与负极极柱6电连接。一并参见图2，在外壳1内的负极极柱6的外部套装有负极抱箍8，负极极耳10的一端采用激光焊方式焊接于负极极柱6与负极抱箍8之间。同样，正极片一端延伸出的正极集流体卷绕形成正极极耳11，该正极极耳11的一端采用激光焊方式焊接于正极极柱7与正极抱箍9之间。
本发明的另一个实施例见图3，与上述实施例不同的是，正极极柱7与正极盖板3为一体成型。
以上仅为本发明的具体实施例，并不以此限定本发明的保护范围；在不违反本发明构思的基础上所作的任何替换与改进，均属本发明的保护范围。

Claims (10)

1.一种圆柱型锂离子动力电池，其包括圆柱形外壳、正极盖板、负极盖板、正极极柱、负极极柱、中心管及电芯，所述正极盖板和所述负极盖板分别固定安装在所述外壳的两端，所述正极极柱和所述负极极柱分别设于该正极盖板和该负极盖板上，所述中心管位于外壳内，其两端分别与所述正极极柱和所述负极极柱连接，所述电芯包括负极片、隔离膜和正极片，该负极片、该隔离膜和该正极片依次卷绕在所述中心管上，且该正极片和该负极片分别经正极极耳和负极极耳与所述正极极柱和所述负极极柱电连接；其特征在于：在所述负极盖板上设有通孔，并在该通孔内密封焊接有负极陶瓷环，所述负极极柱穿设于该负极陶瓷环的中心孔内并与负极陶瓷环密封焊接。
2.根据权利要求1所述的圆柱型锂离子动力电池，其特征在于：所述负极陶瓷环与所述负极极柱和所述负极盖板的焊接方式为钎焊。
3.根据权利要求1所述的圆柱型锂离子动力电池，其特征在于：在所述正极盖板上设有通孔，并在该通孔内密封焊接有正极陶瓷环，所述正极极柱穿设于该正极陶瓷环的中心孔内并与正极陶瓷环密封焊接。
4.根据权利要求3所述的圆柱型锂离子动力电池，其特征在于：所述正极陶瓷环与所述正极极柱和所述正极盖板的焊接方式为钎焊。
5.根据权利要求1所述的圆柱型锂离子动力电池，其特征在于：所述正极盖板与所述正极极柱一体成型。
6.根据权利要求1所述的圆柱型锂离子动力电池，其特征在于：在所述正极极柱和所述负极极柱的外端面上设有螺孔。
7.根据权利要求1所述的圆柱型锂离子动力电池，其特征在于：所述正极盖板及所述负极盖板与所述外壳分别通过焊接固定连接。
8.根据权利要求1至7任一项所述的圆柱型锂离子动力电池，其特征在于：所述中心管包括金属上中心管、金属下中心管及连接在该上中心管与该下中心管之间的耐高温绝缘套管。
9.根据权利要求8所述的圆柱型锂离子动力电池，其特征在于：在所述外壳内的所述负极极柱和所述正极极柱的外部分别套装有负极抱箍和正极抱箍，所述负极极耳和所述正极极耳的一端分别焊接在所述负极极柱与所述负极抱箍之间和所述正极极柱与所述正极抱箍之间。
10.根据权利要求9所述的圆柱型锂离子动力电池，其特征在于：所述负极极耳与所述负极极柱和所述负极抱箍的焊接方式为激光焊，所述正极极耳与所述正极极柱和所述正极抱箍的焊接方式为激光焊。
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