CN104620407A - 袋型二次电池及其制备方法 - Google Patents
袋型二次电池及其制备方法 Download PDFInfo
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Classifications
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- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
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- H—ELECTRICITY
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- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
- H01M50/186—Sealing members characterised by the disposition of the sealing members
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- H—ELECTRICITY
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- H01M10/04—Construction or manufacture in general
- H01M10/0436—Small-sized flat cells or batteries for portable equipment
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- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/105—Pouches or flexible bags
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/14—Primary casings; Jackets or wrappings for protecting against damage caused by external factors
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
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- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
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- H01M50/172—Arrangements of electric connectors penetrating the casing
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
本发明涉及袋型二次电池及其制备方法,具体地,上述袋型二次电池包括:袋型外壳,由上部片与下部片接合而成;以及电极组件,收纳于上述袋型外壳的内部;其特征在于,在上述袋型外壳的上部片与下部片接合而成的袋型外壳的外周面上还包含用于提高密封性的聚合物涂敷层。
Description
技术领域
本发明涉及袋型二次电池及其制备方法。
背景技术
随着对移动设备的技术研发和需求的日益增加,作为能源的二次电池的需求急剧增加,因而对能够满足各种需求的电池的多项研究也正进行中。尤其,能够进行充放电的二次电池作为电动汽车、混合动力电动汽车等的动力源备受瞩目。
这种二次电池能够以电池的多种形态制备,在代表性的形状方面,对因厚度薄而能够适用于手机等产品的方形电池和袋型电池的需求高,而在材料方面,对能量密度、放电电压及安全性优秀的锂钴聚合物电池等锂二次电池的需求高。
其中,袋型二次电池能够因重量轻而有利于便携式电子设备的小型化及轻量化。
上述袋型二次电池以如下方法制备:将包含正极、负极、隔膜的电极组件收纳于作为外置材料的袋型外壳,并对电池进行第一次形成之后,实施利用剩余部的脱气(degassing)工序,并以切割的方式去除剩余部,之后对电池进行第二次形成。
此时,由于上述切割工序,所露出的袋型外壳的金属层部分不仅因通电而导致安全性降低,而且因腐蚀而丧失作为包装材料的性能,从而发生水分渗透及电解液损失。尤其,所渗透的水分使电池的内部发生副反应,导致电池性能降低及安全性降低。
因此,正急需能够改善这种缺点的袋型二次电池的制备方法。
发明内容
发明要解决的技术问题
本发明提供袋型二次电池,上述袋型二次电池在袋型外壳的外周面上包括用于提高密封性的聚合物涂敷层。
并且,本发明提供上述袋型二次电池的制备方法。
解决技术问题的手段
本发明提供袋型二次电池,上述二次电池在袋型外壳的外周面上包括用于提高密封性的聚合物涂敷层。
具体地,本发明提供的袋型二次电池,包括:袋型外壳,由上部片与下部片接合而成,以及电极组件,收纳于上述袋型外壳的内部;在上述袋型外壳的上部片与下部片接合而成的袋型外壳的外周面上还包括用于提高密封性的聚合物涂敷层。
本发明的特征在于,上述聚合物以紫外线(UV)固化性聚合物或热固化性聚合物。
并且,本发明提供袋型二次电池的制备方法,上述袋型二次电池的制备方法包括:准备包括收纳部和气体捕集部的袋型外壳的步骤,上述收纳部用于收纳电极组件,上述气体捕集部与收纳部相连接,用于捕集在上述收纳部的内部产生的气体;在上述袋型外壳的内部收纳电极组件的步骤;通过热熔合对上述袋型外壳的周边部进行密封的步骤;向上述袋型外壳的内部注入电解液的步骤;使二次电池活性化,并通过气体捕集部捕集在上述活性化过程中发生的气体的步骤;对上述收纳部与气体捕集部的边界部进行热熔合的步骤;以切割的方式去除上述气体捕集部的步骤;以及在已收纳上述电极组件的袋型外壳的外周面上形成聚合物涂敷层的步骤。
此时,上述聚合物涂敷层能够利用接触式涂敷方法来执行。
发明的效果
本发明在袋型外壳的外周面上形成有用于提高密封性的聚合物涂敷层,从而能够制备出可提高防止水分渗透及电解液泄露的可靠性的袋型二次电池。
附图说明
图1a及图1b为表示本发明一实施例的包括聚合物涂敷层的袋型二次电池的示意图。
图2为表示本发明一实施例的袋型二次电池的制备方法的接触式涂敷方式的示意图。
图3a及图3b为在本发明一实施例的袋型二次电池的制备方法中具体表示涂布头形态的示意图。
附图标记的说明
100:袋型二次电池的上部片或下部片
101:内部层
102:粘合剂层
103:金属层
104:防腐蚀层
105:外部层
106:聚合物涂敷层
201、202:袋型二次电池的电极端子
203:聚合物涂敷层
204:涂布头
204a:海棉涂布头
204b:辊涂布头
205:涂敷物质储存容器
具体实施方式
以下,参照附图对本发明的优选实施例进行详细说明。在此之前,本说明书及发明要求保护范围所使用的术语不应局限于常规或词典上的含义来解释,而是要立足于发明人为了以最佳的方法说明自己的发明而能够对术语的概念进行适当的定义的原则,应以符合本发明技术思想的意义和概念来解释。
因此,本说明书所记载的实施例与附图所示的结构仅为本发明的最优选的一实施例,并不代表本发明的所有技术思想,因词,需要理解的是,在本申请中,有可能存在能够代替这些的多种等同技术方案和变形例。
首先,本发明提供袋型二次电池,包括袋型外壳,由上部片与下部片接合而成;以及电极组件,收纳于上述袋型外壳的内部;在所述袋型外壳的上部片与下部片接合而成的袋型外壳的外周面上还包括用于提高密封性的聚合物涂敷层。
具体地,图1a及图1b为表示本发明一实施例的包括聚合物涂敷层的袋型二次电池的示意图。
参照图1a及图1b,袋型二次电池包括上部片和下部片,上述上部片及下部片分别由内部层101/粘合剂层102/金属层103/防腐蚀层104/外部层105构成,且相互热熔合。
上述内部层101具有热粘结性,因而起到密封材料的作用,并能包含选自由无延伸聚丙烯、聚丙烯-丁烯-乙烯三元共聚物、氯化聚丙烯、聚乙烯、乙烯-丙烯共聚物、聚乙烯与丙烯酸共聚物及聚丙烯与丙烯酸共聚物组成的组中的一种以上。
上述粘合剂层102为了易于与金属层103粘结,以在金属层103涂敷易于粘结的粘结性树脂来形成,并以与内部层101类似的物质形成,而为了提高与金属层103的粘结性,能够包含选自由聚对苯二甲酸乙二醇酯、酸改性(acid modified)聚丙烯及酸改性聚乙烯组成的组中的一种以上。
上述金属层103能够维持机械强度,起到水分与氧的阻隔层作用,并能包含选自由铁(Fe)、碳(C)、铬(Cr)、锰(Mn)、镍(Ni)及铝(Al)组成的组中的一种或两种以上的混合物,更具体地,能够包含选自铝;铁、碳、铬及锰的合金;以及铁、碳、铬及镍的合金组成的组中的一种以上。
上述外部层105起到基材及保护层作用,并能包含选自由聚乙烯、聚苯醚、聚酰亚胺、聚丙烯、流延聚丙烯、聚对苯二甲酸醚酯、聚苯硫醚组成的组中的一种以上。
上述外部层105和金属层103之间还能包括防腐蚀层104。
上述防腐蚀层104为对电解液引发的腐蚀具有耐性的层,并能包含锆、铬或它们的混合物。
并且,上述电极组件作为在设置隔膜的状态下由正极(cathode)和负极(anode)依次层叠的发电元件,由堆叠型或堆叠/折叠型结构构成。电极极耳从电极组件的各极板延伸、电极端子通过如焊接等与从各极板延伸的多个电极极耳分别电连接,且为了电池本体与外部的电连接而由一部分向袋型二次电池的外部露出。
另一方面,在上述袋型二次电池的情况下,在对电池进行第一次形成之后,为了去除最初充放电时发生的气体而实施脱气工序,之后以切割方式去除气体捕集部,并实施对电池进行第二次形成的工序。此时,当实施上述切割工序时,构成袋型外壳的金属层露出并被腐蚀而丧失作为包装材料的功能,由此发生水分渗透及电解液的损失,导致电池性能及安全性降低。
对此,为了改善这些问题,本发明为了提高上述上部片及下部片相粘结的袋型外壳外周面上的密封性,在进行上述第二次形成工序之前或之后,在袋型外壳的外周面上还形成有聚合物涂敷层106,从而不仅能够防止构成袋型外壳的金属层与其他金属物质通电,还能在进行后续工序时保护袋型外壳的外侧面,可防止由后续工序引起的不良影响。
此时,上述聚合物涂敷层的形成位置无特殊限制,如图1b所示,能够单独形成于与电极端子所突出的面垂直的外周面,或者能够选择性地形成于与电极组件的电极端子所突出的面水平的外侧面,但最优选地,如图1a所示,形成于袋型外壳的整个外周面。此时,上述电极端子可包含正极端子及负极端子,能够配置于电极组件的相同的侧边,也能分别配置于相向的两侧边上。例如,上述电极端子能够配置于电池单元的一边、相向的两边,用于防止相互电接触。
并且,在本发明的袋型二次电池中,上述聚合物可包含涂敷后固化来产生绝缘特性的所有聚合物种类,其种类无特殊限制,但具体地,可以为紫外线固化性聚合物或热固化性聚合物。
具体地,上述紫外线固化性聚合物可包含选自由具有两个以上的异氰酸酯基的有机异氰酸酯化合物及由聚内酯类化合物改性的羟烷基(甲基)丙烯酸酯树脂组成的组中的单一物或两种以上的混合物。
并且,上述热固化性聚合物可包含选自由环氧烷基(甲基)丙烯酸酯、烯丙基缩水甘油醚、烯丙基缩水甘油酯、芳基缩水甘油醚、芳基缩水甘油酯、缩水甘油基5-降冰片烯-2-甲基2-羧酸酯(内型、外型混合物)、1,2-环氧-5-己烯、1,2-环氧-9-癸烯(、缩水甘油基(甲基)丙烯酸酯、缩水甘油基α-乙基(甲基)丙烯酸酯、缩水甘油基α-正丙基(甲基)丙烯酸酯、缩水甘油基α-正丁基(甲基)丙烯酸酯、甲基缩水甘油基(甲基)丙烯酸酯、3,4-环氧丁基(甲基)丙烯酸酯、4,5-环氧戊烷基(甲基)丙烯酸酯、5,6-环氧庚基(甲基)丙烯酸酯及6,7-环氧庚基a-乙基丙烯酸酯组成的组中的单一物或它们中的两种以上的混合物。
并且,上述聚合物涂敷层106的厚度无特殊限制,能够根据形成涂敷层的聚合物的种类,将限制水分渗透的厚度作为最小厚度,并且在不超过袋型二次电池的外观规格的范围内,上述厚度越厚越有利。
并且,本发明提供袋型二次电池的制备方法,上述袋型二次电池的制备方法包括:准备包括收纳部和气体捕集部的袋型外壳的步骤,上述收纳部用于收纳电极组件,上述气体捕集部与收纳部相连接,用于捕集在上述收纳部内部产生的气体;在上述袋型外壳的内部收纳电极组件的步骤;通过热熔合对上述袋型外壳的周边部进行密封的步骤;向上述袋型外壳的内部注入电解液的步骤;使二次电池活性化,并通过气体捕集部捕集在上述活性化过程中发生的气体的步骤;对上述收纳部与气体捕集部的边界部进行热熔合的步骤;以切割的方式去除上述气体捕集部的步骤;以及在已收纳上述电极组件的袋型外壳的外周面上形成聚合物涂敷层的步骤。
在本发明的方法中,形成上述聚合物涂敷层的步骤可以在第二次电池形成工序之前或之后实施,但优选地,在第二次电池形成工序之后实施。
并且,上述聚合物涂敷层能够利用接触式涂敷方法来执行。
上述接触式涂敷方法能够利用海棉涂布头或辊涂布头来进行。尤其,由于本发明的聚合物涂敷层在水或有机溶剂等物质中溶解聚合物的状态下进行涂敷,因而对涂敷方法无特殊限制,可以适当地利用并实施。
并且,本发明的方法能够在形成上述聚合物涂敷层之后,为了对此进行干燥而还能执行通常的热干燥工序。
图2为表示本发明一实施例的袋型二次电池的制备方法的接触式涂敷方式的示意图。
参照图2,在经过脱气工序之后,去除气体捕集部,并实施第二次电池形成,之后在露出的袋型外壳的外周面的整个面形成有聚合物涂敷层203。
此时,对上述聚合物涂敷层的形成位置无特殊限制,能够单独形成于与电极端子201、202所突出的面垂直的外周面,或者选择性地形成于与电极组件的电极端子所突出的面水平的外侧面,但最优选地,形成于袋型外壳的整个外周面。
上述聚合物涂敷层能够利用接触式涂敷方法来形成。
即,可将具有涂布头204和储存有聚合物物质的容器205的涂敷装置与袋型外壳的外周面相接触后,沿着外周面进行涂敷来形成。
上述接触式涂布头204能够利用如图3a所示的海棉涂布头204a或如图3b所示的纤维类材料的辊涂布头204b。
Claims (11)
1.一种袋型二次电池,包括:
袋型外壳,由上部片与下部片接合而成;以及
电极组件,收纳于所述袋型外壳的内部;其特征在于,
在所述上部片与下部片接合而成的袋型外壳的外周面上还包括用于提高密封性的聚合物涂敷层。
2.根据权利要求1所述的袋型二次电池,其特征在于,所述上部片及下部片分别包括内部层、金属层及外部层。
3.根据权利要求1所述的袋型二次电池,其特征在于,所述聚合物为紫外线固化性聚合物或热固化性聚合物。
4.根据权利要求3所述的袋型二次电池,其特征在于,所述紫外线固化性聚合物包含选自由具有两个以上的异氰酸酯基的有机异氰酸酯化合物及聚内酯类化合物改性的羟烷基(甲基)丙烯酸酯树脂组成的组中的一种以上。
5.根据权利要求3所述的袋型二次电池,其特征在于,所述热固化性聚合物包含选自由环氧烷基(甲基)丙烯酸酯、烯丙基缩水甘油醚、烯丙基缩水甘油酯、芳基缩水甘油醚、芳基缩水甘油酯、缩水甘油基5-降冰片烯-2-甲基2-羧酸酯(内型混合物、外型混合物)、1,2-环氧-5-己烯、1,2-环氧-9-癸烯、缩水甘油基(甲基)丙烯酸酯、缩水甘油基α-乙基(甲基)丙烯酸酯、缩水甘油基α-正丙基(甲基)丙烯酸酯、缩水甘油基α-正丁基(甲基)丙烯酸酯、甲基缩水甘油基(甲基)丙烯酸酯、3,4-环氧丁基(甲基)丙烯酸酯、4,5-环氧戊烷基(甲基)丙烯酸酯、5,6-环氧庚基(甲基)丙烯酸酯及6,7-环氧庚基α-乙基丙烯酸酯组成的组中的一种以上。
6.根据权利要求1所述的袋型二次电池,其特征在于,所述聚合物涂敷层形成于与所述电极组件的电极端子所突出的面垂直的外周面。
7.根据权利要求1所述的袋型二次电池,其特征在于,所述聚合物涂敷层形成于与所述电极组件的电极端子所突出的面水平的外周面。
8.根据权利要求1所述的袋型二次电池,其特征在于,所述聚合物涂敷层形成于上部片与下部片相接合而成的袋型外壳的整个外周面。
9.一种如权利要求1所述的袋型二次电池的制备方法,其特征在于,包括:
准备包括收纳部和气体捕集部的袋型外壳的步骤,所述收纳部用于收纳电极组件,所述气体捕集部与所述收纳部相连接,用于捕集在所述收纳部的内部产生的气体;
在所述袋型外壳的内部收纳电极组件的步骤;
通过热熔合对所述袋型外壳的周边部进行密封的步骤;
向所述袋型外壳的内部注入电解液的步骤;
使二次电池活性化,并通过气体捕集部捕集在所述活性化过程中发生的气体的步骤;
对所述收纳部与气体捕集部的边界部进行热熔合的步骤;
以切割的方式去除所述气体捕集部的步骤;以及
在收纳有所述电极组件的袋型外壳的外周面上形成聚合物涂敷层的步骤。
10.根据权利要求9所述的袋型二次电池的制备方法,其特征在于,所述聚合物涂敷层利用接触式涂敷方法来执行。
11.根据权利要求10所述的袋型二次电池的制备方法,其特征在于,所述接触式涂敷方法利用海棉涂布头或辊涂布头来执行。
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KR20130013220A (ko) * | 2011-07-27 | 2013-02-06 | 주식회사 엘지화학 | 절연물질이 코팅된 파우치형 2차전지 |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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CN109689365A (zh) * | 2017-03-20 | 2019-04-26 | 株式会社Lg化学 | 用于防止袋型二次电池卷曲的平整设备 |
US10777779B2 (en) | 2017-03-20 | 2020-09-15 | Lg Chem, Ltd. | Leveling apparatus for preventing curling of pouch-type secondary battery |
CN109689365B (zh) * | 2017-03-20 | 2021-04-09 | 株式会社Lg化学 | 用于防止袋型二次电池卷曲的平整设备 |
Also Published As
Publication number | Publication date |
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CN104620407B (zh) | 2017-12-08 |
KR20140136831A (ko) | 2014-12-01 |
WO2014189255A1 (ko) | 2014-11-27 |
US10586956B2 (en) | 2020-03-10 |
US10079373B2 (en) | 2018-09-18 |
JP2015536032A (ja) | 2015-12-17 |
TW201523976A (zh) | 2015-06-16 |
US20140377641A1 (en) | 2014-12-25 |
EP2866275A4 (en) | 2015-11-18 |
EP2866275A1 (en) | 2015-04-29 |
US20180190953A1 (en) | 2018-07-05 |
EP2866275B1 (en) | 2018-01-03 |
TWI548135B (zh) | 2016-09-01 |
JP6179039B2 (ja) | 2017-08-16 |
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