CN111630677B - 袋型二次电池及其制造方法 - Google Patents

袋型二次电池及其制造方法 Download PDF

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CN111630677B
CN111630677B CN201980009129.XA CN201980009129A CN111630677B CN 111630677 B CN111630677 B CN 111630677B CN 201980009129 A CN201980009129 A CN 201980009129A CN 111630677 B CN111630677 B CN 111630677B
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coating layer
case
sealing
conformal
lower case
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CN111630677A (zh
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任相旭
成準烨
朴俊圭
郑起宅
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LG Energy Solution Ltd
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    • H01—ELECTRIC ELEMENTS
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    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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    • 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
    • H01M50/126—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers
    • H01M50/129—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers with two or more layers of only organic material
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    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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Abstract

公开了一种袋型二次电池及其制造方法。更具体地，公开了一种通过在暴露于电池壳体的切割表面的金属层上形成包括保形(Conformal)涂层的绝缘涂层而能够完全保护该金属层免于水分或空气的袋型二次电池及其制造方法，所述方法包括：第一步骤，通过切割包括外部涂层、金属层和内部涂层的层压片制备包括上壳体和下壳体的电池壳体；第二步骤，将电极组件容纳在上壳体与下壳体之间；第三步骤，使设置在上壳体和下壳体的外周的密封部分紧密接触；第四步骤，在密封部分的侧表面上形成保形涂层，从而防止金属层暴露；和第五步骤，通过将上壳体和下壳体的密封部分热密封来将上壳体和下壳体密封。

Description

袋型二次电池及其制造方法
技术领域
本申请要求于2018年12月18日提交的韩国专利申请第2018-0163948号的优先权的权益，通过引用将上述专利申请的整个公开内容结合在此。
本发明涉及一种袋型二次电池及其制造方法，更具体地，涉及一种通过在暴露于电池壳体的切割表面的金属层上形成包括保形涂层的绝缘涂层而能够完全保护该金属层免于水分或空气的袋型二次电池及其制造方法。
背景技术
随着移动装置不断发展以及对移动装置的需求增加，能够充电和放电的二次电池被用作各种移动装置的能源。此外，作为对使用化石燃料的现有汽油和柴油车辆的替代而提出的电动车辆和混合动力车辆的能源，二次电池也引起相当大的关注。
基于电池壳体的形状，二次电池分为具有安装在圆柱形金属罐中的电极组件的圆柱形电池、具有安装在棱柱形金属罐中的电极组件的棱柱形电池、以及具有安装在由铝层压片制成的袋形壳体中的电极组件的袋形电池。
安装在电池壳体中的电极组件是配置成具有包括正极、负极和插置在正极与负极之间的隔膜的结构并且可进行充电和放电的电力产生元件。电极组件分为：果冻卷型电极组件，果冻卷型电极组件配置成具有其中被施加活性材料的长片型正极和长片型负极在其中隔膜插置在正极与负极之间的状态下卷绕的结构；或堆叠型电极组件，堆叠型电极组件配置成具有其中具有预定尺寸的多个正极和具有预定尺寸的多个负极在其中隔膜分别设置在正极与负极之间的状态下顺序地堆叠的结构。果冻卷型电极组件的优点在于，容易制造果冻卷型电极组件并且果冻卷型电极组件具有较高的每单位重量的能量密度。
如图1中所示，这种二次电池配置成具有其中电极组件100安装在电池壳体200中并且正极接片和负极接片分别焊接至暴露于电池壳体200之外的两个引线构件110的结构。
另外，配置成容纳电极组件100的电池壳体200具有其中下壳体220和覆盖下壳体220的上壳体210一体形成，并且其中下壳体220和上壳体210彼此接触的表面被弯曲和折叠的结构。下壳体220和上壳体210具有由内部涂层、金属层和外部涂层构成的层压结构。在一般袋型二次电池制造方法的情况下，涉及切割下壳体220和上壳体210的工序，并且在该工序中，金属层暴露于外部，这是显著降低电池性能、例如加速电池劣化的原因。
作为解决上述问题的常规技术的示例，韩国专利申请公开第2016-131706号公开了一种制造袋型二次电池的方法，包括：将电极组件容纳在袋的上外壳构件与下外壳构件之间的步骤；初次密封袋的上外壳构件和下外壳构件的外部区域的步骤；切割被密封的袋的上外壳构件和下外壳构件的边缘的步骤；以及按压被切割的袋的上外壳构件和下外壳构件的末端，从而在上外壳构件和下外壳构件的切割部分的表面上形成额外密封部分的步骤。
根据上述现有文献，优点在于通过在外壳构件的切割部分的表面上形成额外密封部分，可防止其中金属层的暴露部分与组单元的金属材料接触的缺陷。然而，由于内部树脂层的材料的一部分通过按压而泄漏到切割表面的外部以形成额外密封部分，因此内部树脂层应当形成得较厚，因而存在其中电池壳体的整个体积增加的问题。此外，因为额外密封部分仅依赖于按压来形成，所以存在金属层的暴露表面的一部分可能不会形成密封部分的问题。
(现有技术文献)
韩国专利申请公开第2016-131706号
发明内容
技术问题
鉴于上述问题做出了本发明，本发明的目的在于，提供一种通过在配置成将上壳体和下壳体结合的密封部分的侧表面上形成覆盖金属层的涂层而制造具有简单工序和低缺陷率的袋型二次电池的方法和由此制造的袋型二次电池。
技术方案
根据本发明，可通过提供一种袋型二次电池来实现上述和其他目的，所述袋型二次电池包括：由层压片制成的电池壳体；和容纳在所述电池壳体中的电极组件，其中所述电池壳体由上壳体和下壳体构成，所述上壳体和所述下壳体由包括外部涂层、金属层和内部涂层的层压片制成，在所述上壳体和所述下壳体的外周设置配置成将所述上壳体和所述下壳体彼此结合的密封部分，并且在所述密封部分的侧表面形成配置成防止所述金属层暴露的保形(Conformal)涂层。
在此，在所述保形(Conformal)涂层的外表面的预定区域上进一步形成树脂涂层，所述树脂涂层可通过将所述外部涂层的一部分熔融而形成。
此外，在所述保形(Conformal)涂层的内表面的预定区域上进一步形成树脂涂层，所述树脂涂层可通过将所述外部涂层和/或所述内部涂层的一部分熔融而形成。
此外，根据本发明的优选第一实施方式的制造袋型二次电池的方法可包括：第一步骤，通过切割包括外部涂层、金属层和内部涂层的层压片制备包括上壳体和下壳体的电池壳体；第二步骤，将电极组件容纳在所述上壳体与所述下壳体之间；第三步骤，使设置在所述上壳体和所述下壳体的外周的密封部分紧密接触；和第四步骤，在所述密封部分的侧表面上形成保形(Conformal)涂层，从而防止所述金属层暴露。
此外，在根据本发明的制造袋型二次电池的方法中，优选进一步包括第五步骤，通过将所述上壳体和所述下壳体的所述密封部分热密封来将所述上壳体和所述下壳体密封。
此外，在所述第五步骤中，在所述保形(Conformal)涂层的外表面的预定区域上形成树脂涂层，其中所述树脂涂层是由在所述密封部分的热密封期间熔融的所述外部涂层的一部分形成的。
此外，根据本发明的优选第二实施方式的制造袋型二次电池的方法可包括：第一步骤，通过切割包括外部涂层、金属层和内部涂层的层压片制备包括上壳体和下壳体的电池壳体；第二步骤，将电极组件容纳在所述上壳体与所述下壳体之间；第三步骤，使设置在所述上壳体和所述下壳体的外周的密封部分紧密接触；第四步骤，通过将所述上壳体和所述下壳体的外周的所述密封部分热密封来将所述上壳体和所述下壳体密封；和第五步骤，在所述密封部分的侧表面上形成保形(Conformal)涂层，从而防止所述金属层暴露。
此外，在所述第四步骤中，可在所述密封部分的侧表面的预定区域上部分地形成树脂涂层，所述树脂涂层是由在所述密封部分的热密封期间熔融的所述外部涂层和/或所述内部涂层的一部分形成的。
此外，根据本发明的电池模块可以是包括所述袋型二次电池的电池模块。
此外，根据本发明的电池组可以包括所述电池模块的电池组。
附图说明
图1是示出常规袋型二次电池的透视图。
图2是图解根据本发明的优选第一实施方式的制造袋型二次电池的方法的流程图。
图3是图解根据第一实施方式的上壳体和下壳体的组装工序的工序图；
图4是图解根据本发明的优选第二实施方式的制造袋型二次电池的方法的流程图。
图5是图解根据第二实施方式的上壳体和下壳体的组装工序的工序图；
图6是示出根据本发明制造的袋型二次电池的透视图。
具体实施方式
在本申请中，应当理解术语“包括”、“具有”或包含等指明存在本申请中描述的特征、整体、步骤、操作、部件、部分或它们的组合，但是不排除存在或添加一个或多个其他特征、整体、步骤、操作、部件、部分或它们的组合。
此外，在整个附图中将使用相同的参考标记指代执行相似功能或操作的部分。在本申请中说明一个部分连接至另一个部分的情况下，该一个部分不仅可直接连接至该另一个部分，而且该一个部分还可经由另外的部分间接连接至该另一个部分。此外，包括某一元件不意味着排除其他元件，而是指可进一步包括这种元件，除非另有提及。
下文中，将参照附图描述根据本发明的袋型二次电池及其制造方法。
图2是图解根据本发明的优选第一实施方式的制造袋型二次电池的方法的流程图，图3是图解根据第一实施方式的上壳体和下壳体的组装工序的工序图。
根据本发明第一实施方式的制造袋型二次电池的方法包括：第一步骤，制备包括上壳体210和下壳体220的电池壳体200；第二步骤，将电极组件100容纳在上壳体210与下壳体220之间；第三步骤，使设置在上壳体210和下壳体220的外周的密封部分230紧密接触；第四步骤，在密封部分230的侧表面上形成保形(Conformal)涂层241；和第五步骤，通过将上壳体210和下壳体220的外周的密封部分230热密封来将上壳体210和下壳体220密封。
首先，将更详细地描述制备包括上壳体210和下壳体220的电池壳体200的第一步骤和将电极组件100容纳在上壳体210与下壳体220之间的第二步骤。电池壳体200是容纳电极组件100的壳体，并且电池壳体200使用由外部涂层211和221、金属层212和222以及内部涂层213和223制成的层压片形成可容纳电极组件100的空间部。
内部涂层213和223直接接触电极组件100。因此，内部涂层必须表现出绝缘特性和耐电解质性。此外，为了气密地密封袋型二次电池的内部和外部，内部涂层必须表现出较高的密封性。因而，通过热粘附上壳体和下壳体的内部涂层形成的密封部分必须表现出优异的热粘合强度。
内部涂层213和223的材料可选自表现出优异耐化学性和良好密封性的聚烯烃基树脂，诸如聚丙烯、聚乙烯、聚丙烯酸乙酯或聚丁烯；聚氨酯树脂；和聚酰亚胺树脂。然而，本发明不限于此。例如，表现出诸如抗拉强度、刚性、表面硬度和耐冲击性之类的优异机械特性以及优异耐化学性的聚丙烯是最优选的。
邻接内部涂层213和223的金属层212和222对应于配置成防止水分或各种气体从外部渗透到电池中的阻挡层。重量轻且表现出优异成形性的铝薄膜可用作金属层的优选材料。
外部涂层211和221设置在金属层212和222的另一表面。外部涂层211和221可由表现出优异抗拉强度、水分渗透防止能力和空气渗透防止能力的耐热聚合物制成，使得外部涂层在保护电极组件100的同时表现出优异耐热性和耐化学性。在一示例中，外部涂层可由尼龙或聚对苯二甲酸乙二醇酯制成。然而，本发明不限于此。
容纳在电池壳体200中的电极组件100可以是：果冻卷型电极组件，果冻卷型电极组件配置成具有其中长片型正极和长片型负极在隔膜插置在正极与负极之间的状态下卷绕的结构；包括单位电池的堆叠型电极组件，每个单位电池配置成具有其中矩形正极和矩形负极在隔膜插置在正极与负极之间的状态下堆叠的结构；堆叠/折叠型电极组件，堆叠/折叠型电极组件配置成具有其中在单位电池设置在长的隔离膜上的状态下单位电池进行卷绕的结构；或层压/堆叠型电极组件，层压/堆叠型电极组件配置成具有其中在隔膜插置在单位电池之间的状态下单位电池进行堆叠从而彼此附接的结构。然而，本发明不限于此。
通常包括正极引线和负极引线的引线构件110配置成具有以下结构：附接至电极组件110的上端的正极接片(未示出)和负极接片(未示出)通过焊接分别电连接至正极引线和负极引线并且引线构件110暴露于电池壳体200之外。此时，为了提供绝缘性和密封性，彼此面对的一对绝缘膜(未示出)设置在密封部分230的其中正极引线和负极引线所处的区域中，并且引线构件110设置成在该对绝缘膜(未示出)之间延伸。
在使设置在上壳体210和下壳体220的外周的密封部分230紧密接触的第三步骤中，在容纳电极组件100的状态下，使上壳体210的密封部分230和下壳体220的密封部分230简单地彼此紧密接触。具体地说，利用位于上壳体210和下壳体220的密封部分230的顶部和底部上的一对密封条300，上壳体210和下壳体220的密封部分230被以预定力按压，从而彼此紧密接触。此时，密封部分230未被加热，因此未发生内部涂层213和223以及外部涂层211和221的熔融。
在此，该对密封条300优选进一步设置有以预定角度弯折的弯折部310、和从弯折部分310延伸的翼部320。
更具体地，密封条300中的与上壳体210的外部涂层211的上表面接触的一个密封条包括：沿与上壳体210的切割表面的方向垂直的方向延伸预定长度之后向下弯折的弯折部310、和从弯折部310向上延伸并且以预定角度倾斜的翼部320。
此外，与下壳体220的外部涂层221的下表面接触的另一个密封条300包括：沿与下壳体220的切割表面的方向垂直的方向延伸预定长度之后向上弯折的弯折部310、和从弯折部310向下延伸并且以预定角度倾斜的翼部320。
当在第四步骤中执行形成保形(Conformal)涂层241时，所设置的翼部320用来保护密封条300免于被喷涂保形(Conformal)涂层树脂，并且使保形(Conformal)涂层241集中位于期望的位置。当在第五步骤中执行热密封部分230时，所设置的弯折部310用来诱导熔融的外部涂层211和221的树脂的一部分移动至期望的位置。
第四步骤是用来在密封部分230附近，更具体地，在作为层压片的切割表面的密封部分230的侧表面上形成保形(Conformal)涂层241。
通过将包括外部涂层211和221、金属层212和222以及内部涂层213和223的层压片切割并成型来获得构成电池壳体200的上壳体210和下壳体220。因此，即使密封部分230被热密封，金属层212和222的一部分或全部通常仍暴露于外部，因而处于电脆弱状态。
在本发明的第四步骤中，形成保形(Conformal)涂层241，使得金属层212和222的切割表面不暴露于外部。
在此，保形(Conformal)涂层241可形成在金属层212和222以及外部涂层211和221和/或内部涂层213和223上。
另外，保形(Conformal)涂覆是在PCB组件的表面上以预定树脂形成保护膜的工序，PCB组件通常通过在印刷电路板(Printed Circuit Board，PCB)上安装电子部件而完成。换句话说，当制备了PCB组件时，通过各种涂覆方法以用于保形(Conformal)涂覆的树脂涂覆PCB组件的表面来形成保护膜。可通过各种方法来形成保护膜，诸如排出用于保形(Conformal)涂覆的树脂的喷涂(spray coating)方法、流涂(flow coating)方法、将PCB组件的一部分浸入用于保形(Conformal)涂覆的液体树脂溶液中的浸涂(dip coating)方法、或化学气相沉积(chemical vapor deposition)方法。
在上述各种方法之中，在本发明中优选喷涂(spray coating)方法，因为可选择性地涂覆暴露于外部的金属层212和222、或者与金属层212和222相邻的外部涂层211和221和/或内部涂层213和223。
用于保形(Conformal)涂覆的树脂没有特别限制，只要其能够在金属层212和222上形成膜，并且可在喷涂之后经过预定时间的冷却工序用以固化即可。
由于通过上述工序形成的密封部分230的侧表面上的保形(Conformal)涂层241完全涂覆了金属层212和222，因此可从根本上阻断电池性能劣化的成因，诸如由于与金属层接触的水分或空气导致的腐蚀和绝缘电阻。
随后，通过将上壳体210和下壳体220的外周的密封部分230热密封来执行第五步骤，以密封上壳体210和下壳体220。
在第五步骤中，为了保持袋型二次电池的密封状态，通过加热沿上壳体210和下壳体220的外周设置的密封部分230，使得内部涂层213和223彼此结合来密封电池壳体200。
此时，外部涂层211和221的树脂的一部分也一起熔融，从而在保形(Conformal)涂层241的表面的预定区域上形成树脂涂层242。由于树脂涂层242在与外部涂层211和221连接的状态下延伸至保形(Conformal)涂层241，因此树脂涂层242可防止保形(Conformal)涂层241脱落，并且可更可靠地保护金属层212和222免于水分或空气。
而且，由于不必在金属层212和222的所有表面上形成膜，因此为了制造具有保形涂层的袋型二次电池，外部涂层211和221的厚度可与常规技术相同，并且可应用常规的热密封温度和时间。
接下来，将描述本发明的第二实施方式。图4是图解根据本发明的优选第二实施方式的制造袋型二次电池的方法的流程图，图5是图解根据第二实施方式的上壳体和下壳体的组装工序的工序图。
根据本发明第二实施方式的制造袋型二次电池的方法包括：第一步骤，制备包括上壳体210和下壳体220的电池壳体200；第二步骤，将电极组件100容纳在上壳体210与下壳体220之间；第三步骤，使设置在上壳体210和下壳体220的外周的密封部分230紧密接触；第四步骤，通过将上壳体210和下壳体220的外周的密封部分230热密封来将上壳体210和下壳体220密封；和第五步骤，在密封部分230的侧表面上形成保形(Conformal)涂层241。
在根据本发明第二实施方式的制造袋型二次电池的方法中，第一步骤至第三步骤的配置与上述第一实施方式的第一步骤至第三步骤的配置相同，因此将省略其详细描述，将仅描述与第一实施方式不同的第四步骤和第五步骤。
在通过将上壳体210和下壳体220的外周的密封部分230热密封来将上壳体210和下壳体220密封的第四步骤中，为了保持袋型二次电池的密封状态，通过加热沿上壳体210和下壳体220的外周设置的密封部分230，使得内部涂层213和223彼此结合来密封电池壳体200。
此时，外部涂层211和221和/或内部涂层213和223的熔融树脂的一部分流动至密封部分230的侧表面，从而在金属层212和222的一些暴露部分上形成树脂涂层242。
第五步骤是在密封部分230的侧表面上形成保形(Conformal)涂层241的步骤，使得金属层212和222的切割表面不暴露于外部。
当执行第四步骤时，即使外部涂层211和221和/或内部涂层213和223的树脂没有覆盖金属层212和222的全部暴露表面，由于通过保形(Conformal)涂层241在全部金属层212和222上形成膜，因此仍可保护金属层212和222免于水分或空气。
在第一实施方式中已详细描述了保形(Conformal)涂层241，因此将省略其描述。
图6是示出根据本发明制造的袋型二次电池的透视图。具体地，根据本发明第一或第二实施方式制造的袋型二次电池包括容纳在由上壳体210和下壳体220构成的电池壳体200中的电极组件100，上壳体210和下壳体220由包括外部涂层211和221、金属层212和222以及内部涂层213和223的层压片制成。
此外，在用于将上壳体210和下壳体220结合的密封部分230的侧表面上额外形成有用于防止金属层暴露的涂层240。
具体地，如图3中所述，根据第一实施方式制造的袋型二次电池设置有涂层240，涂层240以这样的形状形成，即其中在保形(Conformal)涂层241的外表面的预定区域上额外形成通过将外部涂层211和221的一部分熔融而形成的树脂涂层242。
另一方面，如图5中所述，根据第二实施方式制造的袋型二次电池设置有涂层240，涂层240以这样的形状形成，即其中在保形(Conformal)涂层241的内表面的预定区域上额外形成通过将外部涂层211和221和/或内部涂层213和223的一部分熔融而形成的树脂涂层242。
尽管已详细描述了本发明的具体细节，但本领域技术人员将理解到，本发明的详细描述仅公开了其优选实施方式，因而不限制本发明的范围。因此，本领域技术人员将理解到，在不背离本发明的范畴和技术构思的情况下，各种变化和修改是可能的，并且很显然这种变化和修改落入所附权利要求的范围内。
(参考标记的描述)
100：电极组件
110：引线构件
200：电池壳体
210：上壳体
211：外部涂层 212：金属层
213：内部涂层
220：下壳体
221：外部涂层 222：金属层
223：内部涂层
230：密封部分
240：涂层
241：保形涂层 242：树脂涂层
300：密封条
310：弯折部
320：翼部
工业实用性
根据本发明的制造袋型二次电池的方法和袋型二次电池，由于使用具有简单工序的保形涂覆方法在金属层上形成额外涂层，因此可完全阻挡金属层免于水分或空气，而无需使用具有较厚的内部涂层或外部涂层的层压片。

Claims (6)

1.一种袋型二次电池，包括：
由层压片制成的电池壳体；和
容纳在所述电池壳体中的电极组件，
其中
所述电池壳体由上壳体和下壳体构成，所述上壳体和所述下壳体由包括外部涂层、金属层和内部涂层的层压片制成，
在所述上壳体和所述下壳体的外周设置配置成将所述上壳体和所述下壳体彼此结合的密封部分，并且
在所述密封部分的侧表面形成配置成防止所述金属层暴露的保形涂层，
其中在所述保形涂层的外表面的预定区域上进一步形成树脂涂层，
其中所述树脂涂层是通过将所述外部涂层的一部分熔融而形成的，并且
其中所述保形涂层由在喷涂之后经过预定时间的冷却工序用以固化的用于保形涂覆的树脂形成。
2.一种袋型二次电池，包括：
由层压片制成的电池壳体；和
容纳在所述电池壳体中的电极组件，
其中
所述电池壳体由上壳体和下壳体构成，所述上壳体和所述下壳体由包括外部涂层、金属层和内部涂层的层压片制成，
在所述上壳体和所述下壳体的外周设置配置成将所述上壳体和所述下壳体彼此结合的密封部分，并且
在所述密封部分的侧表面形成配置成防止所述金属层暴露的保形涂层，
其中在所述保形涂层的内表面的预定区域上进一步形成树脂涂层，所述树脂涂层是通过将所述外部涂层和/或所述内部涂层的一部分熔融而形成的，并且
其中所述保形涂层由在喷涂之后经过预定时间的冷却工序用以固化的用于保形涂覆的树脂形成。
3.一种制造袋型二次电池的方法，所述方法包括：
第一步骤，通过切割包括外部涂层、金属层和内部涂层的层压片制备包括上壳体和下壳体的电池壳体；
第二步骤，将电极组件容纳在所述上壳体与所述下壳体之间；
第三步骤，使设置在所述上壳体和所述下壳体的外周的密封部分紧密接触；
第四步骤，在所述密封部分的侧表面上形成保形涂层，从而防止所述金属层暴露；和
第五步骤，通过将所述上壳体和所述下壳体的所述密封部分热密封来将所述上壳体和所述下壳体密封，
其中，在所述第五步骤中，在所述保形涂层的外表面的预定区域上形成树脂涂层，所述树脂涂层是由在所述密封部分的热密封期间熔融的所述外部涂层的一部分形成的，并且
其中所述保形涂层由在喷涂之后经过预定时间的冷却工序用以固化的用于保形涂覆的树脂形成。
4.一种制造袋型二次电池的方法，所述方法包括：
第一步骤，通过切割包括外部涂层、金属层和内部涂层的层压片制备包括上壳体和下壳体的电池壳体；
第二步骤，将电极组件容纳在所述上壳体与所述下壳体之间；
第三步骤，使设置在所述上壳体和所述下壳体的外周的密封部分紧密接触；
第四步骤，通过将所述上壳体和所述下壳体的外周的所述密封部分热密封来将所述上壳体和所述下壳体密封；和
第五步骤，在所述密封部分的侧表面上形成保形涂层，从而防止所述金属层暴露，
其中，在所述第四步骤中，在所述密封部分的侧表面的预定区域上部分地形成树脂涂层，所述树脂涂层是由在所述密封部分的热密封期间熔融的所述外部涂层和/或所述内部涂层的一部分形成的，并且
其中所述保形涂层由在喷涂之后经过预定时间的冷却工序用以固化的用于保形涂覆的树脂形成。
5.一种电池模块，包括根据权利要求1或2所述的袋型二次电池。
6.一种电池组，包括根据权利要求5所述的电池模块。
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