CN107949928B - 二次电池 - Google Patents
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Abstract
本发明涉及一种二次电池,包括:电极组件;和容纳电极组件于其中的壳体,其中壳体包括藉由热量而收缩的可热收缩保护层。
Description
技术领域
相关申请的交叉引用
本申请要求于2016年6月9日提交的韩国专利申请第10-2016-0071640号的优先权的权益,通过引用将上述专利申请作为整体结合在此。
技术领域
本发明涉及一种二次电池,且更具体地,涉及一种有效地抑制电极组件膨胀的二次电池。
背景技术
通常,二次电池是指可充电和可放电的电池,不同于不可充电的原电池。这种二次电池正广泛地用于诸如手机、笔记本电脑、和摄像机之类的高科技电子领域。
这种二次电池包括电极组件和容纳电极组件于其中的壳体。电极组件具有其中多个电极和多个隔板彼此交替地堆叠的结构。
为了改善上述二次电池的性能,执行充电/放电工艺。在此,电极组件会膨胀而导致电极组件变形。此外,由于电极组件的膨胀,二次电池在外观上扩展而导致产品缺陷。
发明内容
技术问题
已做出本发明来解决上述问题,并且本发明的目的在于提供一种二次电池,所述二次电池经由壳体有效地抑制电极组件的膨胀并防止二次电池的外观扩展,并且由此防止出现产品缺陷。
技术方案
为了实现上述目的,根据本发明的二次电池包括:电极组件;和容纳电极组件于其中的壳体,其中壳体包括藉由热量而收缩的可热收缩保护层。
壳体具有其中金属层、外粘合层、和可热收缩保护层顺序地堆叠的结构。
可热收缩保护层可置于壳体的最外侧上。
可热收缩保护层可附着至壳体的最外侧。
可热收缩保护层可堆叠在壳体的最外侧上。
可热收缩保护层可置于壳体的最内侧上。
可热收缩保护层可由绝缘材料制成。
可热收缩保护层可设置为双轴取向膜。
可热收缩保护层可由尼龙、聚丙烯、聚酯、聚酰胺、和聚苯乙烯中的一种制成。
可热收缩保护层可由不具有热固性的材料制成。
密封层和内粘合层可进一步堆叠在壳体的内表面上。
壳体可具有其中密封层、内粘合层、金属层、外粘合层、和可热收缩保护层由内向外顺序地堆叠的结构。
可热收缩保护层可置于壳体的整个圆周上。
有益效果
本发明具有如下效果。
第一:根据本发明的二次电池可设置有包括可热收缩保护层的壳体,以便有效地抑制电极组件的膨胀,由此防止电极组件和二次电池变形。
第二:在根据本发明的二次电池中,壳体可设置有金属层、外粘合层和可热收缩保护层,以便在维持壳体的绝缘性的同时有效地抑制电极组件的膨胀。
第三:在根据本发明的二次电池中,可热收缩保护层可设置为双轴取向膜,以便显著地防止电极组件变形。
第四:在根据本发明的二次电池中,可热收缩保护层可由绝缘材料制成,以便防止由于可热收缩保护层而引起的与外部的短路。
第五:在根据本发明的二次电池中,可热收缩保护层可由不具有热固性的材料制成。因此,当可热收缩保护层降低温度降低时,壳体可恢复到其初始状态以实现使用的连续性。
第六:在根据本发明的二次电池中,壳体还可包括密封层和内粘合层,以便改善壳体的密封性。
附图说明
图1是根据本发明实施方式的二次电池的截面图。
图2是图1中所示的部分‘A’的放大图。
图3是示出根据本发明实施方式的二次电池的按压状态的截面图。
具体实施方式
在下文中,将参照附图以本发明的技术思想可由本发明所属领域的普通技术人员容易地实施的方式而详细地描述本发明的各实施方式。然而,本发明可以不同的形式来体现且不应解释为受限于在此阐述的各实施方式。在附图中,为清楚起见,将省略任何对于描述本发明不必要的内容,并且附图中相同的附图标记表示相同的元件。
如图1所示,根据本发明实施方式的二次电池包括电极组件110和容纳电极组件110于其中的壳体120。
电极组件110是通过在垂直方向上交替堆叠多个电极和多个隔板来制造。多个电极可设置有第一电极和第二电极,多个隔板可设置有第一隔板和第二隔板。
也就是说,电极组件可设置为其中第一电极、第一隔板、第二电极和第二隔板在垂直方向上顺序地堆叠的基本单元或者其中堆叠有两个以上的基本单元的单元堆叠件。
壳体120具有袋形以将电极组件110容纳于其中。
为了改善二次电池的性能,执行充电/放电工艺。在此,当电极组件110进行充电和放电时,由于电池电阻而产生热量,同时,由于锂嵌入到负极中、锂的脱嵌、以及电极组件的界面的增加之故,二次电池110膨胀(swelling)并因此变形。特别是,通过由于反复充电和放电而导致的锂的脱嵌或增加界面,发生在二次电池的外观上的膨胀和电池性能方面的劣化,从而导致产品缺陷。
为了解决上述问题,根据本发明实施方式的二次电池包括含可热收缩保护层125的壳体120,所述可热收缩保护层125在充电和放电时有效地抑制电极组件110的膨胀。
也就是说,壳体120包括可热收缩保护层125,可热收缩保护层125在充电和放电时藉由在电极组件110中产生的热量而收缩的同时可有效地按压电极组件110,以有效地抑制电极组件110的膨胀并且还防止电极组件110和二次电池变形。特别是,可热收缩保护层可吸收在充电和放电时产生的热量以改善电池的膨胀并降低电池的温度,由此防止电池由于温度升高而导致降低电池寿命并且提高稳定性。在此,壳体120具有其中金属层123、外粘合层124和可热收缩保护层125顺序地堆叠的结构。
在此,壳体120可经由金属层123来改善壳体120的强度,经由可热收缩保护层125来抑制电极组件110的膨胀,并经由外粘合层124来改善金属层123与可热收缩保护层125之间的耦合。
可热收缩保护层125可置于壳体120的最外侧上。例如,壳体120具有其中金属层123、外粘合层124、和可热收缩保护层125由内向外顺序地堆叠的结构。因此,由于容纳在壳体120中的电极组件110和可热收缩保护层125之间的接触而发生的问题可得以预先防止,以更稳定地使壳体120收缩。
在此,可热收缩保护层125可在壳体120制造之后附着至壳体120的最外侧。当制造壳体120时,可热收缩保护层125可被堆叠为置于壳体120的外部处。因此,在制造上的方便性和简易性可得以改善。
可热收缩保护层125可置于壳体120的内部。例如,壳体120具有其中可热收缩保护层125、外粘合层124和金属层123由内向外顺序地堆叠的结构。
可热收缩保护层125可由具有绝缘性的材料制成。也就是说,如果可热收缩保护层由导电材料制成,设置在电极组件110中的其他电极可经由该可热收缩保护层125彼此连接而导致短路。为了防止这种现象发生,可热收缩保护层125可由绝缘材料制成,以防止其他电极彼此间短路并且也预先防止短路发生。
可热收缩保护层125可设置为双轴取向膜。也就是说,双轴取向膜在强度、热收缩性、和透明性方面都是优异的。由于可热收缩保护层设置为双轴取向膜,所以在充电和放电时,经由按压在电极组件110的体积上的扩展可被稳定地抑制,以防止电极组件110变形。
可热收缩保护层125可由尼龙(Nylon)、聚丙烯(Polypropylene)、聚酯(Polyester)、聚酰胺(Polyamide)、和聚苯乙烯(Polystyrene)中的一种材料制成。该材料通常不按压电极组件110,但该材料在充电或放电时藉由在电极组件110中产生的热量而收缩的同时有效地按压电极组件110。
可热收缩保护层125可以由不具有热固性的材料制成。也就是说,可热收缩保护层125可由对其施加热量时难以硬化的材料制成。因此,即便可热收缩保护层125通过在电极组件110中产生的热量而收缩,可热收缩保护层125可具有柔性以有效地按压电极组件。特别是,在材料不具有热固性的情况下,当可热收缩保护层125降低温度时,可热收缩保护层125可恢复到其初始形状。在这种情况下,使用的连续性可得以实现。
可热收缩保护层125置于壳体120的整个圆周之上。也就是说,当可热收缩保护层125收缩时,壳体120的整体可同时收缩以均匀地按压电极组件110的整体。
密封层121和内粘合层122可进一步堆叠在壳体120的内表面上。也就是说,壳体120可具有其中密封层121、内粘合层122、金属层123、外粘合层124、和可热收缩保护层125由内向外顺序地堆叠的结构。壳体120的密封性可经由添加的密封层121得以改善,且密封层121和金属层123之间的耦合力可经由内粘合层122得以改善。
如上所述,根据本发明实施方式的二次电池可包括含可热收缩保护层125的壳体120,以在充电和放电时有效地抑制电极组件110的膨胀的,特别是,防止电极组件110和二次电池变形,由此改善安全性和适销性。
因此,本发明的范围是由所附的权利要求,而不是由前述的说明以及其中描述的示例性实施方式所限定的。在与本发明的权利要求等同的含义内以及在权利要求内进行的各种修改被认为是在本发明的范围内。
Claims (6)
1.一种二次电池,包括:
电极组件;和
容纳所述电极组件于其中的壳体,
其中所述壳体包括在充电和放电时藉由在所述电极组件中产生的热量而收缩的同时按压所述电极组件的可热收缩保护层,
其中所述可热收缩保护层是由不具有热固性的材料制成,并且当所述可热收缩保护层降低温度时,所述可热收缩保护层恢复到其初始形状,
其中所述可热收缩保护层是在所述壳体制造之后附着至所述壳体的最外侧,
其中所述可热收缩保护层是置于所述壳体的整个圆周上,使得当所述可热收缩保护层收缩时,所述壳体的整体同时收缩以均匀地按压所述电极组件的整体,并且
其中所述可热收缩保护层是设置为双轴取向膜,使得经由所述按压在电极组件的体积上的扩展被稳定地抑制,以防止所述电极组件变形。
2.根据权利要求1所述的二次电池,其中所述壳体具有其中金属层、外粘合层、和所述可热收缩保护层顺序地堆叠的结构。
3.根据权利要求1所述的二次电池,其中所述可热收缩保护层是由绝缘材料制成。
4.根据权利要求1所述的二次电池,其中所述可热收缩保护层是由尼龙、聚丙烯、聚酯、聚酰胺、和聚苯乙烯中的一种制成。
5.根据权利要求2所述的二次电池,其中密封层和内粘合层是进一步堆叠在所述壳体的内表面上。
6.根据权利要求5所述的二次电池,其中所述壳体具有其中所述密封层、所述内粘合层、所述金属层、所述外粘合层、和所述可热收缩保护层由内向外顺序地堆叠的结构。
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KR1020160071640A KR20170139303A (ko) | 2016-06-09 | 2016-06-09 | 이차전지 |
PCT/KR2017/005285 WO2017213363A1 (ko) | 2016-06-09 | 2017-05-22 | 이차전지 |
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