CN109560219A - 蓄电组件 - Google Patents

蓄电组件 Download PDF

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CN109560219A
CN109560219A CN201811130730.8A CN201811130730A CN109560219A CN 109560219 A CN109560219 A CN 109560219A CN 201811130730 A CN201811130730 A CN 201811130730A CN 109560219 A CN109560219 A CN 109560219A
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土屋孝之
石井信治
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Taiyo Yuden Co Ltd
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Abstract

本发明提供即使发生异常情况也能够安全地拆解的蓄电组件。本发明的蓄电组件具有蓄电部件单体和壳体。上述蓄电部件单体具有蓄电元件和封入上述蓄电元件的外装体。上述壳体具有收纳上述蓄电部件单体的收纳空间。上述壳体具有与上述收纳空间和外部空间连通的贯通孔。上述贯通孔形成在与上述蓄电部件单体的不存在上述蓄电元件的部分对应的位置。

Description

蓄电组件
技术领域
本发明涉及内置有蓄电部件单体的蓄电组件。
背景技术
锂离子电容器等蓄电部件单体通常收纳于壳体而用作蓄电组件。此处，蓄电部件单体可能由于外部短路、过放电而在内部产生气体，导致蓄电部件单体的内压上升。
因此，在大部分的蓄电部件单体设置有安全阀，在内压变成一定值以上时从安全阀释放内压(例如参照专利文献1)。蓄电部件单体的壳体通常设计成即使蓄电部件单体由于内压而膨胀，也不会在到达安全阀的工作压力之前破损。
现有技术文献
专利文献
专利文献1：日本特开2005-203262号公报
发明内容
发明要解决的课题
此处，在将发生了异常情况的蓄电组件拆解时，只要安全阀工作则不会发生问题。但是，在蓄电部件单体的内压没有达到安全阀的工作压力时，在由蓄电部件单体的膨胀产生的应力施加于壳体的状态下进行拆解。
此时，担心在壳体产生变形而难以拆解、或构成壳体的部件飞散。此外，担心如果被施加长时间的应力则螺纹件等发生疲劳破坏，可能导致蓄电部件单体、壳体的破损。
鉴于以上情况，本发明的目的在于提供即使发生异常情况也能够在拆解前释放内压，由此能够安全地拆解的蓄电组件。
用于解决课题的技术方案
为了达成上述目的，本发明的一个方式的蓄电组件具有蓄电部件单体和壳体。
上述蓄电部件单体具有蓄电元件和封入上述蓄电元件的外装体。
上述壳体具有收纳上述蓄电部件单体的收纳空间。
上述壳体具有与上述收纳空间和外部空间连通的贯通孔。
上述贯通孔形成在与上述蓄电部件单体的不存在上述蓄电元件的部分对应的位置。
根据该结构，即使在蓄电部件单体的内压上升，对壳体施加了应力的状态下，通过将针插通在贯通孔中能够在外装体开孔，使内压释放。由此能够在分解壳体之前除去应力，安全地拆解蓄电组件。
可以是，上述外装体为层压膜，上述层压膜具有在上述蓄电元件的周围被熔接了的密封区域、和上述密封区域与上述蓄电元件之间的非密封区域，上述贯通孔形成在与上述非密封区域对应的位置。
可以是，上述蓄电部件单体具有：与上述蓄电元件的正极连接的、经由上述非密封区域和上述密封区域从上述层压膜引出的正极极耳；和与上述蓄电元件的负极连接的、经由上述非密封区域和上述密封区域从上述层压膜引出的负极极耳，上述贯通孔形成在对应于上述正极极耳与上述负极极耳之间的上述非密封区域的位置。
可以是，上述壳体能够在上述收纳空间中收纳多个上述蓄电部件单体，上述蓄电组件具有多个贯通孔，所述多个贯通孔形成在与上述多个蓄电部件单体的不存在上述蓄电元件的部分对应的位置。
可以是，上述收纳空间能够收纳重叠着的上述多个蓄电元件。
发明效果
根据以上所述的本发明，能够提供即使发生异常情况也能够在拆解前将内压释放，由此能够安全拆解的蓄电组件。
附图说明
图1是本发明的实施方式的蓄电组件的立体图。
图2是该蓄电组件的分解立体图。
图3是该蓄电组件所具有的蓄电部件单体的立体图。
图4是该蓄电组件所具有的蓄电部件单体的截面图。
图5是该蓄电组件所具有的蓄电部件单体的平面图。
图6是表示该蓄电组件所具有的蓄电部件单体的配置的示意图。
图7是该蓄电组件的立体图。
图8是表示该蓄电组件所具有的壳体的贯通孔的配置的示意图。
具体实施方式
对本发明的实施方式的蓄电组件进行说明。
[蓄电组件的结构]
图1是本实施方式的蓄电组件100的立体图，图2是蓄电组件100的分解立体图。如这些图所示，蓄电组件100具有壳体110和蓄电部件单体120。另外，以下的各图中将彼此正交的3个方向分别称为X方向、Y方向和Z方向。
壳体110如图2所示由框部件111、第一板部件112和第二板部件113构成。
框部件111是由合成树脂等构成的框状的部件。在框部件111安装有搭载有与蓄电部件单体120的正极端子和负极端子分别电连接的母线、蓄电部件单体120的控制电路的基板等。
第一板部件112和第二板部件113是由铝等金属形成的板状的部件。第一板部件112和第二板部件113夹着框部件111，由此形成由框部件111、第一板部件112和第二板部件113包围的收纳空间R。第一板部件112和第二板部件113通过螺纹固定等固定于框部件111。
壳体110的结构并不限于此处所示的方式，只要形成能够收纳蓄电部件单体120的收纳空间即可。
蓄电部件单体120是能够充电和放电的部件单体。图3是蓄电部件单体120的立体图。图4是蓄电部件单体120的截面图，是图3的A-A线处的截面图。如这些图所示，蓄电部件单体120具有蓄电元件121、外装部件122、正极极耳123和负极极耳124。
蓄电元件121如图4所示，通过层叠正极125、负极126和隔膜127而构成。
正极125是包括正极材料的片状的部件，例如能够在集电箔层叠正极材料而形成。集电箔例如是多孔性的铝箔，正极材料例如是混合有活性炭等正极活性物质和粘合树脂等的材料。
负极126是包括负极材料的片状的部件，例如能够在集电箔层叠负极材料而形成。集电箔例如是多孔性的铜箔，负极材料例如是混合有石墨等负极活性物质和粘合树脂等的材料。
隔膜127是包括纺织布、无纺布或合成树脂微多孔膜等的片状的部件，使正极125与负极126绝缘。
正极125和负极126隔着隔膜127层叠，而构成蓄电元件121。正极125和负极126的层数没有特别限定。蓄电元件121与任意的电解液一起收纳在外装部件122中。
外装部件122密封蓄电元件121。外装部件122能够是用合成树脂覆盖金属箔的正面背面这两面而得的层压膜，在蓄电元件121的周缘，该合成树脂被热熔接。图5是蓄电部件单体120的平面图。
如图5所示，将外装部件122被熔接了的区域作为密封区域122a(图中斜线区域)，将密封区域122a与蓄电元件121之间没有被熔接的区域作为非密封区域122b。
另外，外装部件122并非必须为层压膜，只要是能够密封蓄电元件121的部件即可。
正极极耳123与正极125电连接，经由非密封区域122b和密封区域122a被引出到外装部件122的外部。正极极耳123能够是由铝等形成的金属箔或金属板。
负极极耳124与负极126电连接，经由非密封区域122b和密封区域122a被引出到外装部件122的外部。负极极耳124能够是由铜等形成的金属箔或金属板。
蓄电部件单体120具有以上的结构。蓄电部件单体120的结构并不限于此处所示的结构，只要是锂离子电容器、锂离子二次电池或双电层电容器等能够进行充电和放电的结构即可。
蓄电部件单体120被收纳在壳体110的收纳空间R中。图6是表示在收纳空间R中收纳的蓄电部件单体120的配置的示意图。如该图所示在收纳空间R中，能够收纳两组重叠了2个蓄电部件单体120而成的蓄电部件单体120组。此外，在收纳空间R中收纳的蓄电部件单体120的数量没有限定，也可以仅收纳1个蓄电部件单体120。
[关于贯通孔]
在第一板部件112和第二板部件113设置有贯通孔。图7是表示贯通孔130的配置的示意图。贯通孔130是在第一板部件112和第二板部件113中贯通它们各自的正面背面的孔。其大小没有特别限定，直径为数mm左右。
贯通孔130形成在与蓄电部件单体120中不存在蓄电元件121的部分对应的位置，即形成在与不存在蓄电元件121的部分相对的位置。图8是表示贯通孔130的位置的示意图。如该图所示，将从垂直于第一板部件112或第二板部件113的方向通过贯通孔130的直线作为直线L时，贯通孔130设置在直线L到达非密封区域122b(参照图5)的位置。
特别优选的是，贯通孔130的位置处于到达正极极耳123与负极极耳124之间的非密封区域122b的位置(图5中的P)。
贯通孔130与各个蓄电部件单体120对应地各设置有1个。如图6所示在收纳空间R中收纳有两组重叠了2个蓄电部件单体120而成的蓄电部件单体120组时，第一板部件112和第二板部件113各自面向两个蓄电部件单体120。
因此，在第一板部件112和第二板部件113分别各设置有2个贯通孔130。这些贯通孔130分别设置在上述直线L到达各蓄电部件单体120的非密封区域122b的位置。
贯通孔130可以就保持这样，也可以用遮盖用的密封材等塞住。
[关于贯通孔的效果]
在发生异常情况时在蓄电部件单体120中产生气体，内压上升时，蓄电部件单体120膨胀，对壳体110施加应力。在将这样的蓄电部件单体120拆解时，向贯通孔130插入针，在外装部件122开孔。由此，气体从该孔排出，施加于壳体110的应力消失，能够安全地将蓄电部件单体120拆解。
如上所述贯通孔130设置于避开蓄电元件121的位置，因此能够防止由于向贯通孔130插入的针而导致发生内部短路。另外，插入贯通孔130的针优选是像注射针那样在内部形成有流路的结构，但只要是锐利的针即可。
附图标记说明
100……蓄电组件
110……壳体
120……蓄电部件单体
121……蓄电元件
122……外装部件
122a……密封区域
122b……非密封区域
123……正极极耳
124……负极极耳
125……正极
126……负极
127……隔膜
130……贯通孔。

Claims (5)

1.一种蓄电组件，其特征在于，包括：
具有蓄电元件和封入所述蓄电元件的外装体的蓄电部件单体；和
具有收纳所述蓄电部件单体的收纳空间的壳体，
所述壳体具有与所述收纳空间和外部空间连通的贯通孔，
所述贯通孔形成在与所述蓄电部件单体的不存在所述蓄电元件的部分对应的位置。
2.如权利要求1所述的蓄电组件，其特征在于：
所述外装体是层压膜，
所述层压膜具有在所述蓄电元件的周围被熔接了的密封区域，和所述密封区域与所述蓄电元件之间的非密封区域，
所述贯通孔形成在与所述非密封区域对应的位置。
3.如权利要求2所述的蓄电组件，其特征在于：
所述蓄电部件单体具有：与所述蓄电元件的正极连接的、经由所述非密封区域和所述密封区域从所述层压膜引出的正极极耳；和与所述蓄电元件的负极连接的、经由所述非密封区域和所述密封区域从所述层压膜引出的负极极耳，
所述贯通孔形成在对应于所述正极极耳与所述负极极耳之间的所述非密封区域的位置。
4.如权利要求1～3中任一项所述的蓄电组件，其特征在于：
所述壳体能够在所述收纳空间中收纳多个所述蓄电部件单体，
所述蓄电组件具有多个贯通孔，所述多个贯通孔形成在与所述多个蓄电部件单体的不存在所述蓄电元件的部分对应的位置。
5.如权利要求4所述的蓄电组件，其特征在于：
所述收纳空间能够收纳重叠着的所述多个蓄电元件。
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