CN201436692U - 一种圆柱形锂二次电池盖帽组件及使用该盖帽组件的电池 - Google Patents
一种圆柱形锂二次电池盖帽组件及使用该盖帽组件的电池 Download PDFInfo
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Abstract
本实用新型提供了一种圆柱形锂二次电池盖帽组件及使用该盖帽组件的电池,所述的盖帽组件包括所述上帽、热敏电阻片、金属底板、具有凹槽的密封圈,所述上帽、热敏电阻片和金属底板依次层叠置于密封圈凹槽中,所述密封圈用于防止盖帽组件内的部件与电池外壳电接触;所述金属底板边缘向上翻边包裹所述热敏电阻片和上帽,所述上帽与金属底板之间设置有绝缘圈,用于防止上帽与金属底板电接触。采用本实用新型盖帽组件的圆柱形锂二次电池既对电池有高温断开保护,同时又有效防止了盖帽的漏液。
Description
【技术领域】
本实用新型涉及一种二次锂电池领域,特别是涉及一种圆柱形锂二次电池盖帽组件和使用该盖帽组件的圆柱形锂二次电池。
【背景技术】
锂二次电池由于具有重量轻、体积小、无污染、内压小、低成本等优点,成为便携电子设备用的主要电源。而当电池在使用过程中,尤其是大电流充放电或者短路时,电池存在安全隐患,容易发鼓,甚至***、燃烧。解决电池的安全性问题可以从电池的正负极活性材料本身的化学性能着手改进,也可以从电池的结构设计进行改善。
用于锂二次电池的正极活性物质通常为锂过渡金属氧化物,负极活性物质为碳材料,电解液中通常含碳酸乙烯酯(EC)、碳酸丙烯酯(PC)、二乙基碳酸酯(DEC)、碳酸甲乙酯(EMC)、二甲基碳酸酯(DMC)等有机溶剂和六氟磷酸锂、四氟硼酸锂、六氟砷酸锂、高氯酸锂、卤化锂、氯铝酸锂、氟烃基氟氧磷酸锂及氟烃基磺酸锂等电解质盐。当电池在过充过放等条件下工作时,电池内部温度会升高,如果没有控制保护装置,电池很可能***、燃烧。
圆柱形锂二次电池的盖帽组件是其结构安全设计的一个关键环节。说明书附图1显示了现有技术中的一种圆柱形锂二次电池的盖帽组件的结构示意图,其中,包括上帽1、密封圈2、环形导电片3、防爆板4、CID孔板5,所述防爆板4向下弯折与CID孔板5焊接连接,所述环形导电片3设置在上帽1与防爆板4之间并接触连接,密封圈2将上帽1、环形导电片3、防爆板4密封固定,并防止其与电池外壳接触。但是,该使用该盖帽组件的电池,当其在使用过程中,电池内部压力还不到防爆板启动压力值时,防爆板已经向外受力凸起,边缘就会向内拉动变形,此时防爆板接触密封圈位置就会移动直接导致密封失效,造成电池漏液。电解液易腐蚀外部线路以及壳体金属,严重时可能造成起火***,引起安全事故。另外,该现有技术中当电池温度升高、内部气压上升不足以使CID孔板断开时,不能实现高温断开保护的功能,也使电池安全隐患上升。如使用磷酸铁锂作为正极活性材料的电池,会出现电池内压不高,温度很高的安全问题。
【实用新型内容】
本实用新型的解决的技术问题是现有技术中存在的圆柱形锂二次电池盖帽组件密封不好电池漏液和高温断开保护的问题,提供了一种结构简单的新型圆柱形锂二次电池盖帽组件。
本实用新型还提供了一种使用本实用新型的盖帽组件的圆柱形锂二次电池。
本实用新型的技术方案是:
一种圆柱形锂二次电池盖帽组件,包括上帽、热敏电阻片、金属底板、具有凹槽的密封圈,所述上帽、热敏电阻片和金属底板依次层叠置于密封圈凹槽中,所述密封圈用于防止盖帽组件内的部件与电池外壳电接触;所述金属底板边缘向上翻边包裹所述热敏电阻片和上帽,所述上帽与金属底板之间设置有绝缘圈,用于防止上帽与金属底板电接触。
另外,本实用新型提供了一种圆柱形锂二次电池,包括外壳、盖帽组件、电芯,
所述电芯由正极片、隔膜和负极片卷绕形成,并置于电池外壳中,所述电芯通过正极耳、负极耳引出;
所述盖帽组件包括上帽、热敏电阻片、金属底板、具有凹槽的密封圈,所述上帽、热敏电阻片和金属底板依次层叠置于密封圈凹槽中,所述密封圈用于防止盖帽组件内的部件与电池外壳电接触;所述金属底板边缘向上翻边包裹所述热敏电阻片和上帽,所述上帽与金属底板之间设置有绝缘圈,用于防止上帽与金属底板电接触;
所述电芯的正极耳与所述金属底板电连接,所述负极耳与所述外壳电连接;所述盖帽组件安装在电池外壳开口处,用于密封电池。
本实用新型的有益效果是:
本实用新型提供的圆柱形锂二次电池盖帽组件通过在金属底板与上帽之间设置热敏电阻片,达到电池非正常高温断开保护的功能;同时,金属底板边缘采用向上翻边包裹热敏电阻片和上帽,使整个组件与密封圈密封效果更好,实现防止泄露电解液的目的;但是金属底板向上翻边包裹热敏电阻片和上帽,会使上帽与金属底板直接接触,如此则不能实现热敏电阻片高温断开保护的功能,因此,在上帽与金属底板之间设置了绝缘圈,用于防止上帽与金属底板电接触。
【附图说明】
图1为现有技术中的一种圆柱形锂二次电池盖帽组件的结构剖视图。
图2为本实用新型的圆柱形锂二次电池盖帽组件的结构剖视图。
图3为使用本实用新型的圆柱形锂二次电池盖帽组件的电池的结构剖视图。
附图标号说明:1上帽,2密封圈,3环形导电片,4防爆板,5CID孔板,6金属底板,7热敏电阻片,8绝缘圈,9防爆压痕,10释压气孔,11正极耳,12外壳,13电芯。
【具体实施方式】
下面结合说明书附图具体描述本实用新型的具体实施方式。
如说明书附图2所示,本实用新型提供的圆柱形锂二次电池盖帽组件具体实现方式,包括上帽1、热敏电阻片7、金属底板6、密封圈2、以及绝缘圈8,所述热敏电阻片7为环形的片体,形状跟垫片相似。将上帽1边缘与热敏电阻片7的环形边相贴,再将内扣形的绝缘圈8扣在上帽1边缘与热敏电阻片7的边缘端部。将装好的上帽1、热敏电阻片7和绝缘圈8放入金属底板6,金属底板6边缘向上翻边包裹且内扣住绝缘圈8,绝缘圈8位于上帽1与金属底板6之间,防止了上帽1与金属底板6的接触。再将整个组件装入密封圈2的凹槽中,密封圈2用于防止组件与电池外壳的接触。
所述绝缘圈8为环形内扣形绝缘圈,所述绝缘圈8优选的内扣上帽1边缘和热敏电阻片7的边缘,所述金属底板6翻边外包绝缘圈8。
所述的密封圈2、绝缘圈8的材料可以选自聚丙烯材料等具耐电解液材料。所述热敏电阻片7为正温度系数的热敏材料制成。
所述上帽1上设有释压气孔10,所述金属底板6上设有“凹”字形的环形防爆压痕9,当电池内部压力超过预定压力值是金属底板6破裂,释放电池内部压力,防止了电池***。
进而,所述的金属底板6边缘的翻边结构与外侧的密封圈形成紧密配合,从而有效实现防止电解液泄露的目的。
如说明书附图3所示,本实用新型提供的使用本实用新型盖帽组件的圆柱形锂二次电池剖面示意图,其中包括电池外壳12、盖帽组件、电芯13,所述电芯13由正极片、隔膜和负极片卷绕形成,并置于电池外壳12中,所述电芯通过正极耳11、负极耳(图中未画出)引出。
所述盖帽组件包括上帽1、热敏电阻片7、金属底板6、具有凹槽的密封圈2以及绝缘圈8,所述上帽1上设有释压气孔10,所述上帽1、热敏电阻片7和金属底板6依次层叠置于密封圈2凹槽中,所述密封圈2用于防止盖帽组件内的部件与电池外壳12电接触;所述金属底板6边缘向上翻边包裹所述热敏电阻片7和上帽1,所述热敏电阻片7、上帽1边缘与金属底板6翻边之间设置有绝缘圈8,用于防止上帽1与金属底板6电接触。所述电芯的正极耳11与所述金属底板6焊接连接,所述负极耳与所述外壳电连接;所述盖帽组件安装在电池外壳开口处,用于密封电池。
当所述电池使用中发生异常现象,电池内部温度升高,超过热敏电阻片的临界温度,热敏电阻片断开保护。同时,由于采用了金属底板边缘向上翻边包裹热敏电阻片和上帽,翻边的金属底板与密封圈紧密配合防止了电池使用中的漏液现象的发生。而绝缘圈的使用也没有导致热敏电阻片在上帽与金属底板之间的断开保护功能不能实现。
Claims (8)
1.一种圆柱形锂二次电池盖帽组件,其特征在于:包括上帽、热敏电阻片、金属底板、具有凹槽的密封圈,所述上帽、热敏电阻片和金属底板依次层叠置于密封圈凹槽中,所述密封圈用于防止盖帽组件内的部件与电池外壳电接触;所述金属底板边缘向上翻边包裹所述热敏电阻片和上帽,所述上帽与金属底板之间还设置有绝缘圈,用于防止上帽与金属底板电接触。
2.根据权利要求1所述的圆柱形锂二次电池盖帽组件,其特征在于,所述绝缘圈为环形内扣形绝缘圈,所述绝缘圈内扣上帽和热敏电阻片的边缘,所述金属底板翻边外包绝缘圈。
3.根据权利要求1所述的圆柱形锂二次电池盖帽组件,其特征在于,所述上帽上设有释压气孔,所述金属底板上设有防爆压痕,用于当电池内部压力超过预定值时所述防爆压痕破裂释放电池内部压力。
4.根据权利要求1所述的圆柱形锂二次电池盖帽组件,其特征在于,所述热敏电阻片为环形的热敏电阻片。
5.一种圆柱形锂二次电池,其特征在于:包括外壳、盖帽组件、电芯,
所述电芯由正极片、隔膜和负极片卷绕形成,并置于电池外壳中,所述电芯通过正极耳、负极耳引出;
所述盖帽组件包括上帽、热敏电阻片、金属底板、具有凹槽的密封圈,所述上帽、热敏电阻片和金属底板依次层叠置于密封圈凹槽中,所述密封圈用于防止盖帽组件内的部件与电池外壳电接触;所述金属底板边缘向上翻边包裹所述热敏电阻片和上帽,所述上帽与金属底板之间设置有绝缘圈,用于防止上帽与金属底板电接触;
所述电芯的正极耳与所述金属底板电连接,所述负极耳与所述外壳电连接;所述盖帽组件安装在电池外壳开口处,用于密封电池。
6.根据权利要求5所述的圆柱形锂二次电池,其特征在于,所述绝缘圈为环形内扣形绝缘圈,所述绝缘圈内扣上帽和热敏电阻片的边缘,所述金属底板翻边外包绝缘圈。
7.根据权利要求5所述的圆柱形锂二次电池,其特征在于,所述上帽上设有释压气孔,所述金属底板上设有防爆压痕,用于当电池内部压力超过预定值时所述防爆压痕破裂释放电池内部压力。
8.根据权利要求5所述的圆柱形锂二次电池,其特征在于,所述热敏电阻片为环形的热敏电阻片。
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CN2009200677257U CN201436692U (zh) | 2009-02-12 | 2009-02-12 | 一种圆柱形锂二次电池盖帽组件及使用该盖帽组件的电池 |
KR1020117020571A KR101236452B1 (ko) | 2009-02-12 | 2010-02-09 | 엔드 커버 어셈블리 및 이를 구비한 리튬 2차 전지 |
US12/702,941 US20100203367A1 (en) | 2009-02-12 | 2010-02-09 | End cover assembly for battery and battery containing the same |
JP2011549424A JP2012517676A (ja) | 2009-02-12 | 2010-02-09 | エンドカバー部材および該エンドカバー部材を備えるリチウム二次電池 |
PCT/CN2010/070576 WO2010091628A1 (en) | 2009-02-12 | 2010-02-09 | End cover assembly and lithium secondary battery having the same |
EP10740917.9A EP2377183A4 (en) | 2009-02-12 | 2010-02-09 | END CAP ASSEMBLY AND LITHIUM SECONDARY BATTERY COMPRISING SAME |
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US20100203367A1 (en) | 2010-08-12 |
EP2377183A4 (en) | 2013-05-01 |
WO2010091628A1 (en) | 2010-08-19 |
EP2377183A1 (en) | 2011-10-19 |
KR20110125230A (ko) | 2011-11-18 |
US20130143078A1 (en) | 2013-06-06 |
JP2012517676A (ja) | 2012-08-02 |
KR101236452B1 (ko) | 2013-02-22 |
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