CN211789103U - 用于二次电池的袋及袋型二次电池 - Google Patents

用于二次电池的袋及袋型二次电池 Download PDF

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Publication number
CN211789103U
CN211789103U CN202020255269.5U CN202020255269U CN211789103U CN 211789103 U CN211789103 U CN 211789103U CN 202020255269 U CN202020255269 U CN 202020255269U CN 211789103 U CN211789103 U CN 211789103U
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China
Prior art keywords
layer
pouch
secondary battery
stacked
sealant
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CN202020255269.5U
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English (en)
Inventor
李汉荣
金宣圭
郑凡永
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LG Energy Solution Ltd
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LG Chem Ltd
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Abstract

本实用新型的用于二次电池的袋包括：表面保护层，所述表面保护层由第一聚合物制成且形成在最外层；密封剂层，所述密封剂层由第二聚合物制成且形成在最内层；气体阻挡层，所述气体阻挡层由金属制成且堆叠在所述表面保护层与所述密封剂层之间；和散热层，所述散热层由陶瓷制成，堆叠在所述表面保护层与所述密封剂层之间，并且当所述散热层被施加特定压力时向外释放将热量。

Description

用于二次电池的袋及袋型二次电池
相关申请的交叉引用
本申请要求享有于2019年3月4日提交的韩国专利申请第10-2019-0024846号的优先权权益，通过引用将该申请整体并入本申请。
技术领域
本实用新型涉及一种用于二次电池的袋及一种袋型二次电池，且更具体而言，涉及一种即使在低温下发生过电压(Over Voltage)也能够防止发生析锂(Lithium Plating)的用于二次电池的袋及一种袋型二次电池。
背景技术
通常，二次电池包括镍镉电池、镍氢电池、锂离子电池和锂离子聚合物电池。这种二次电池正被应用及使用于诸如数码相机、P-DVD、MP3P、移动电话、PDA、便携式游戏装置、电动工具、电动自行车及类似物之类的小型产品中以及诸如电动车辆和混合动力车辆、用于储存剩余电力或可再生能源的电力储存装置和备用电力储存装置之类的需要高功率的大型产品中。
为了制造电极组件，阴极、隔膜和阳极被制造且堆叠。具体地，将阴极活性材料浆料施加于阴极集电器并将阳极活性材料浆料施加于阳极集电器，以制造阴极和阳极。此外，当将隔膜插入且堆叠在所制造的阴极和阳极之间时，形成单元电池(Unit Cell)。将单元电池彼此堆叠以形成电极组件。此外，当将电极组件容纳于特定壳体中并注入电解质时，制造了二次电池。
传统上，当在低温下发生过电压时，在阳极上发生析锂，从而增加电极组件的厚度。因此，存在袋型二次电池的总厚度增大、二次电池的组件质量劣化并且相对于体积的能量效率降低的问题。
实用新型内容
技术问题
本实用新型的目的是提供一种即使在低温下发生过电压也能够防止发生析锂的用于二次电池的袋及一种袋型二次电池。
本实用新型的目的不限于前述目的，而是本文未描述的其他目的将由本领域技术人员从以下描述清楚地了解。
技术方案
用于解决上述问题的根据本实用新型的实施方式的一种用于二次电池的袋包括：表面保护层，所述表面保护层由第一聚合物制成且形成在所述袋的最外层；密封剂层，所述密封剂层由第二聚合物制成且形成在所述袋的最内层；气体阻挡层，所述气体阻挡层由金属制成且堆叠在所述表面保护层与所述密封剂层之间；和散热层，所述散热层由陶瓷制成，堆叠在所述表面保护层与所述密封剂层之间，并且当所述散热层被施加特定压力时向外释放热量。
此外，所述陶瓷可包括λ-五氧化三钛(λ-trititanium pentoxide)。
此外，当被施加大于60MPa的压力时所述陶瓷可转化成β-五氧化三钛。(β-trititaniumpentoxide)
此外，可设置有多个气体阻挡层。
此外，所述散热层可堆叠在所述多个气体阻挡层之间。
此外，所述散热层可堆叠在所述气体阻挡层内侧。
此外，可设置有多个表面保护层。
此外，所述多个表面保护层可包括：由聚对苯二甲酸乙二醇酯制成且形成在最外层的第一表面保护层；和由尼龙制成且堆叠在所述第一表面保护层内侧的第二表面保护层。
此外，可设置有多个密封剂层。
此外，所述多个密封剂层可包括：由酸改性的聚丙烯制成且形成在所述最内层的第一密封剂层；和由流延聚丙烯制成且堆叠在所述第一密封剂层外侧的第二密封剂层。
用于解决上述问题的根据本实用新型的实施方式的一种袋型二次电池包括：电极组件，所述电极组件中电极和隔膜交替堆叠；和被配置为容纳所述电极组件的袋型二次电池壳体，其中所述袋型二次电池壳体包括：表面保护层，所述表面保护层由第一聚合物制成且形成在所述袋型二次电池壳体的最外层；密封剂层，所述密封剂层由第二聚合物制成且形成在所述袋型二次电池壳体的最内层；气体阻挡层，所述气体阻挡层由金属制成且堆叠在所述表面保护层与所述密封剂层之间；和散热层，所述散热层由陶瓷制成、堆叠在所述表面保护层与所述密封剂层之间、并且当将特定压力施加到所述散热层时将热释放到外部。
此外，所述陶瓷可包括λ-五氧化三钛(λ-trititanium pentoxide)。
此外，可设置有多个气体阻挡层。
此外，所述散热层可堆叠在所述多个气体阻挡层之间。
其他实施方式的特性被包括在详细描述和图中。
有益效果
本实用新型的实施方式可至少具有以下效果。
用于二次电池的袋可包括由包含λ-五氧化三钛(λ-trititaniumpentoxide)的陶瓷制成的散热层，当施加压力时，可将热量释放到外部以升高温度，由此即使在低温下发生过电压也会防止发生析锂。
本实用新型的效果不限于前述描述，因此本说明书中包含更多不同的效果。
附图说明
图1是根据本实用新型的实施方式的袋型二次电池的组装图。
图2是根据本实用新型的实施方式的袋型二次电池的放大截面图。
图3是示出根据本实用新型的实施方式，袋型二次电池的厚度增加的状态的放大截面图。
图4是根据本实用新型的实施方式的袋膜的截面图。
图5是λ-五氧化三钛(λ-trititanium pentoxide)和β-五氧化三钛(β-trititanium pentoxide)的概念图。
图6是根据本实用新型的另一实施方式的袋膜的截面图。
图7是示出根据本实用新型的另一实施方式的具有复合膜结构的袋膜的表面保护层和密封剂层的截面图。
具体实施方式
本实用新型的优点和特征及其实现方法将经由以下参照附图描述的实施方式而清楚。然而，本实用新型可以不同形式实施而不应被解释为限制于本文阐述的实施方式。而是，这些实施方式被提供以使得本公开内容将是全面且完整的，并且将向本领域技术人员充分地传达本实用新型的范围。此外，本实用新型仅由权利要求书的范围限定。相同参考数字通篇表示相同元件。
除非本实用新型中使用的术语被不同地定义，否则本文使用的全部术语(包括技术和科技术语)具有与本领域技术人员通常所理解的相同含义。此外，除非在描述中明确地且清楚地定义，否则在常用词典中定义的术语不被理想地或过分地解释为具有正式含义。
在以下描述中，技术术语仅用于解释特定示例性实施方式而不限制本实用新型。在本说明书中，除非具体提到，否则单数形式的术语可包括复数形式。“包括”和/或“包含”的含义不排除所提及的部件以外的其他部件。
以下，将参考随附的附图详细描述优选实施方式。
图1是根据本实用新型的实施方式的袋型二次电池1的组装图。
如图1中所示，根据本实用新型的实施方式的袋型二次电池1包括袋型电池壳体13和容纳在电池壳体13中的电极组件10。
电极组件10可以是堆叠结构，包括诸如阴极和阳极之类的两个电极、和插入在电极之间以将电极彼此绝缘或设置在一个电极的左侧或右侧处的隔膜。所述堆叠结构可具有各种形状，因而其形状不受限制。例如，各自具有预定标准的阴极和阳极可在其间具有隔膜的情况下进行堆叠，或者堆叠结构可以以包卷(Jelly Roll)的形式进行卷绕。两个电极中的每个电极具有其中活性材料浆料被施加到包括铝和铜的金属箔或网状集电器的结构。通常可在加入溶剂的情况下搅拌颗粒状活性材料、辅助性导体、粘合剂和增塑剂来形成浆料。可在后续工序中去除溶剂。
如图1中所示，电极组件10包括电极接片(Electrode Tab)11。电极接片11连接到电极组件10的阴极和阳极中的每一个，以伸出到电极组件10的外部，从而在电极组件10的内部与外部之间提供电子移动路径。电极组件10的集电器由涂覆有电极活性材料的部分和其上未施加有电极活性材料的末端，即未涂覆部分，构成。此外，可通过切割未涂覆部分或通过经由超声波焊接将单独的导电构件连接至未涂覆部分来形成电极接片11的每一个。如图1中所示，电极接片11可沿相同方向从电极组件10的一侧伸出，但本实用新型不限于此。例如，电极接片11可沿彼此不同的方向伸出。
在电极组件10中，电极引线(Electrode Lead)12通过点焊连接至电极接片11。此外，电极引线12的一部分被绝缘部14围绕。绝缘部14可设置成被限制在密封部内，从而粘合至电池壳体13，上袋131和下袋132在所述密封部处热熔合。此外，可防止从电极组件10产生的电力经由电极引线12流到电池壳体13，并且可保持电池壳体13的密封。因此，绝缘部14可由不导电的具有非导电性的非导体制成。通常，尽管主要使用容易贴附到电极引线12并且具有相对薄厚度的绝缘胶带作为绝缘部14，但本实用新型不限于此。例如，各种构件可用作为绝缘部14，只要这些构件能够将电极引线12绝缘即可。
根据阴极接片111和阳极接片112的形成位置，电极引线12可沿相同方向延伸或沿彼此不同的方向延伸。阴极引线121和阳极引线122可由彼此不同的材料制成。也就是说，阴极引线121可由与阴极板相同的材料，即铝(Al)材料制成，阳极引线122可由与阳极板相同的材料，即铜(Cu)材料或涂覆有镍(Ni)的铜材料制成。此外，伸出到电池壳体13的外部的电极引线12的一部分可被设为端子部并电连接至外部端子。
电池壳体13是由柔性材料制成的袋。此外，电池壳体13容纳电极组件10，使得电极引线12的一部分(即端子部)被暴露，然后被密封。如图1中所示，电池壳体13包括上袋131和下袋132。可在下袋132中设置其中形成有杯部133以容纳电极组件10的容纳空间1331，上袋131可覆盖容纳空间1331的上侧，使得电极组件10不被分离到电池壳体13的外部。尽管在图1中杯部133仅形成在下袋132中，但本实用新型不限于此。例如，杯部133可被不同地形成，例如，形成在上袋中。如图1中所示，上袋131的一侧和下袋132的一侧可彼此连接。然而，本实用新型不限于此，上袋和下袋可被单独地制造以彼此分离。
当电极引线12连接至电极组件10的电极接片11，并且绝缘部14设在电极引线12的一部分上时，可将电极组件10容纳在设于下袋132的杯部133中的容纳空间中，并且上袋131可覆盖容纳空间的上部。此外，注入电解质，并将设在上袋131和下袋132的每一者的边缘的密封部密封。在二次电池1的充电和放电期间，电解质可移动通过电极的电化学反应产生的锂离子。电解质可包括非水性有机电解质或使用聚合物电解质的聚合物，所述非水性有机电解质是锂盐和高纯度有机溶剂的混合物。
图2是根据本实用新型的实施方式的袋型二次电池1的放大截面图，图3是示出根据本实用新型的实施方式，袋型二次电池1的厚度增大的状态的放大截面图。
如上所述，当在低温下发生过电压时，充电电流密度增大，因此阴极的锂离子没有快速地容纳在阳极活性材料涂覆层中。结果，锂离子累积在阳极的表面上而析出为金属锂。这被称为析锂。
当在阳极上发生析锂时，电极组件10的厚度增大，如图3所示。因此，袋型二次电池1的总厚度可能增大，从而劣化二次电池1的组件质量并减小相对于体积的能量效率。
图4是根据本实用新型的实施方式的袋膜134的截面图。
根据本实用新型的实施方式，用于二次电池的袋可包括由包含λ-五氧化三钛的陶瓷制成的散热层1344，当被施加压力时，可向外释放热量，以升高温度，由此即使在低温下发生过电压，也会防止发生析锂。
为此，根据本实用新型的实施方式的用于二次电池的袋包括：表面保护层1342，所述表面保护层1342由第一聚合物制成且形成在最外层；密封剂层1343，所述密封剂层1343由第二聚合物制成且形成在最内层；气体阻挡层1341，所述气体阻挡层1341由金属制成且堆叠在表面保护层1342与密封剂层1343之间；和散热层1344，所述散热层1344由陶瓷制成，堆叠在表面保护层1342与密封剂层1343之间，并且当散热层1344被施加特定压力时向外释放热量。此外，所述陶瓷可以是λ-五氧化三钛，并且当被施加大于60MPa的压力时所述陶瓷可转化成β-五氧化三钛。
作为根据本实用新型的实施方式的袋型二次电池1的电池壳体13的袋可通过拉延(Drawing)袋膜134来制造。就是说，通过使用冲模或类似物来拉伸袋膜134以形成杯部133，从而制造袋13。根据本实用新型的实施方式，如图4中所示，袋膜134包括气体阻挡层1341、表面保护层1342和密封剂层1343。
气体阻挡层1341可确保袋13的机械强度，阻挡二次电池1外部的气体或湿气的进入和排放以及防止电解质泄露。通常，气体阻挡层1341由金属制成，所述金属可包括铝。铝可确保具有预定水平以上的机械强度但重量轻。因此，铝可确保针对因电极组件10和电解质所致的电化学性质的补充及散热。然而，本实用新型不限于此。例如，气体阻挡层1341可由各种材料制成。例如，气体阻挡层1341可由选自由铁(Fe)、铬(Cr)、锰(Mn)、镍(Ni)和铝(Al)组成的群组的一种材料，或者两种或更多种材料的混合物制成。这里，当气体阻挡层1341由包含铁的材料制成时，可改善机械强度。当气体阻挡层1341由包含铝的材料制成时，可改善柔性。因此，可考虑气体阻挡层1341的特性来使用形成气体阻挡层1341的材料。
若气体阻挡层1341由铝制成，则气体阻挡层1341可具有约30μm至约80μm的厚度。若气体阻挡层1341的厚度小于30μm，则气体阻挡层1341过薄而导致成型性劣化并产生大量的针孔(Pinhole)，从而使电池质量劣化。相反，若气体阻挡层的厚度大于80μm，则袋的总厚度较厚而增大二次电池的体积并使能量密度劣化。更优选地，气体阻挡层1341可具有30μm至50μm的厚度。
表面保护层1342由第一聚合物制成且设置在最外层以保护二次电池1免受外部摩擦和碰撞并且还将电极组件10与外部电绝缘。这里，最外层表示当以气体阻挡层1341为基准，沿与电极组件10的设置方向相反的方向取向时设置在最后的层。形成表面保护层1342的第一聚合物可包括选自由以下材料组成的群组的至少一种或多种材料：聚乙烯、聚丙烯、聚碳酸酯、聚对苯二甲酸乙二醇酯(PET)、聚氯乙烯、丙烯酸聚合物、聚丙烯腈、聚酰亚胺、聚酰胺、纤维素、芳族聚酰胺、尼龙、聚酯、聚对苯撑苯并双恶唑(polyparaphenylenebenzobisoxazole)、聚芳酯、特氟龙(teflon)和玻璃纤维。特别地，使用诸如主要具有耐磨性和耐热性的尼龙(Nylon)树脂或聚对苯二甲酸乙二醇酯(PET)之类的聚合物。
表面保护层1342若由PET制成则可具有12μm至25μm的厚度。若表面保护层1342具有小于12μm的厚度，则外部绝缘可劣化，并且与气体阻挡层1341的粘合力可劣化。相反，若表面保护层1342具有大于25μm的厚度，则袋的总厚度较厚而增大二次电池的体积并使能量密度劣化。更优选地，表面保护层1342可具有20μm至25μm的厚度。
表面保护层1342可具有由任何一种材料制成的单层结构或者可设成多层。即，表面保护层1342可具有复合层结构，所述复合层结构由分别由两种或更多种材料制成的层构成。在这种情况中，多个表面保护层1342可包括由聚对苯二甲酸乙二醇酯(PET)制成且形成在最外层的第一表面保护层和由尼龙制成且堆叠在第一表面保护层内侧的第二表面保护层。
密封剂层1343由第二聚合物制成且设置在最内层以直接接触电极组件10。这里，最内层表示当以气体阻挡层1341为基准，沿与电极组件10的设置方向取向时设置在最后的层。在袋中，当使用冲模拉延具有如上所述的堆叠结构的袋膜134时，袋膜134的一部分被拉伸，以形成包括具有袋子形状的容纳空间1331的杯部133。此外，当将电极组件10容纳于容纳空间1331中时，注入电解质。之后，当上袋131和下袋132可彼此接触并向密封部施加热压缩时，密封剂层1343可彼此粘合以密封袋。这里，由于密封剂层1343直接接触电极组件10，因此密封剂层1343必须具有绝缘性质。此外，由于密封剂层1343还接触电解质，因此密封剂层1343必须具有耐腐蚀性。此外，由于电池壳体13的内部被完全被密封以防止材料在电池壳体13的内外之间移动，因此必须实现高密封性。就是说，密封剂层1343在密封部彼此粘合，所述密封部必须具有优异的热粘合强度。通常，形成密封剂层1343的第二聚合物可包括选自由以下材料组成的组的至少一种或多种材料：聚乙烯、聚丙烯、聚碳酸酯、聚对苯二甲酸乙二醇酯、聚氯乙烯、丙烯酸聚合物、聚丙烯腈、聚酰亚胺、聚酰胺、纤维素、芳族聚酰胺、尼龙、聚酯、聚对苯撑苯并双恶唑、聚芳酯、特氟龙和玻璃纤维。特别地，诸如聚丙烯(PP)或聚乙烯(PE)之类的聚烯烃类树脂可用于密封剂层1343。聚丙烯(PP)在诸如抗张强度、刚性、表面硬度、耐磨性和耐热性之类的机械性质上以及诸如耐腐蚀性之类的化学性质上是优良的，因此主要使用聚丙烯(PP)来制造密封剂层1343。另外，密封剂层1343可由流延聚丙烯(Casted Polypropylene)、酸改性聚丙烯(Acid Modified Polypropylene)或聚丙烯-丁烯-乙烯三元聚合物制成。这里，酸改性的聚丙烯可以是马来酸酐聚丙烯(maleicanhydride polypropylene；MAH PP)。
若密封剂层1343由聚丙烯(PP)制成，则密封剂层1343可具有30μm至100μm的厚度。若密封剂层1343的厚度小于30μm，则密封剂层的耐久性可劣化，诸如在密封期间出现内部破裂。相反地，若密封剂层1343的厚度大于100μm，则袋的总厚度较厚而增大二次电池的体积并使能量密度劣化。更优选地，密封剂层1343可具有50μm至80μm的厚度。
密封剂层1343可具有由任何一种材料制成的单层结构或者可设成多层。即，密封剂层可具有复合层结构，所述复合层结构由分别由两种或更多种材料制成的层构成。在这种情况中，多个密封剂层1343可包括由酸改性的聚丙烯(PPa)制成且形成在最内层的第一密封剂层和由流延聚丙烯(Casted Polypropylene,CPP)制成且堆叠在第一密封剂层外侧的第二密封剂层。
根据本实用新型的一个实施方式，袋膜134进一步包括散热层1344，所述散热层1344由陶瓷制成，堆叠在表面保护层1342与密封剂层1343之间，并且当被施加特定压力时释放热量。
散热层1344由吸收热量，然后当被施加特定压力时转化成另一材料以将所吸收的热量释放到外部的陶瓷制成。这里，所述陶瓷可以是λ-五氧化三钛(λ-Ti3O5)。
散热层1344可堆叠在气体阻挡层1341内侧，如图4所示。特别地，优选的是，散热层1344的一个表面被堆叠成与气体阻挡层1342直接接触。结果，散热层1344设置在电极组件10与气体阻挡层1341之间。因此，当电极组件10的厚度增大时，可通过由金属制成的气体阻挡层1341将压力有效地施加到散热层1344。
图5是λ-五氧化三钛和β-五氧化三钛的概念图。
如图5中所示，λ-五氧化三钛(λ-Ti3O5)可仅由钛原子(Ti)和氧原子(O)构成且可吸收约230kJ/L的热量。此外，在其中λ-五氧化三钛吸收并储存热量的状态下，当施加大于约60MPa的压力时，λ-五氧化三钛转化成β-五氧化三钛(β-Ti3O5)。这里，λ-五氧化三钛和β-五氧化三钛仅在原子的物理键合结构上彼此不同，但其构成材料彼此没有化学差异。
λ-五氧化三钛被加压而转化成β-五氧化三钛以将所储存的具有约230kJ/L的热量释放到外部。结果，环境温度可升高。
如上所述，当在低温下发生过电压时，充电电流密度可能增大，并且在阳极上发生析锂而增大电极组件的厚度。因此，存在以下问题：袋型二次电池的总厚度增大，二次电池的组件质量劣化，以及相对于体积的能量效率减小。
然而，根据本实用新型的实施方式，用于二次电池的袋可包括由包含λ-五氧化三钛的陶瓷制成的散热层1344，当被施加压力时，可向外释放热量以升高温度，从而即使在低温下发生过电压，也能够防止发生析锂。
释放热量的β-五氧化三钛通过吸收周围的热量再次转化成λ-五氧化三钛。因此，散热层1344可不断地重复上述过程。
图6是根据本实用新型的另一实施方式的袋膜134a的截面图。
在根据本实用新型的实施方式的袋膜134中，气体阻挡层1341具有单层结构，散热层1344被堆叠在气体阻挡层1341内侧。
然而，在根据本实用新型的另一实施方式的袋膜134a中，如图6所示，可设置多个气体阻挡层1341a和1341b。即，袋膜134a可具有复合层结构，所述复合层结构由分别由两种或更多种材料制成的层构成。即使在这种情况下，多个气体阻挡层1341a和1341b可由同种金属制成。即，气体阻挡层1341可由选自由以下材料组成的群组的一种材料，或者两种或更多种材料的混合物制成：铁(Fe)、铬(Cr)、锰(Mn)、镍(Ni)和铝(Al)。
散热层1344可堆叠在多个气体阻挡层1341a和1341b之间，如图6所示。特别地，优选的是，散热层1344的两个表面均被堆叠成与气体阻挡层1341a和1341b直接接触。结果，当电极组件10的厚度增大时，可通过由金属制成的气体阻挡层1341a和1341b将压力更有效地施加到散热层1344。
图7是示出根据本实用新型的另一实施方式的袋膜134a的表面保护层1342和密封剂层1343具有复合膜结构的状态的截面图。
另外根据本实用新型的另一实施方式，表面保护层1342可具有由任何一种材料制成的单层结构或者可设为多层。即，袋膜134a可具有复合层结构，所述复合层结构由分别由两种或更多种材料制成的层构成。在该情况中，多个表面保护层1342可包括由聚对苯二甲酸乙二醇酯(PET)制成且形成在最外层的第一表面保护层1342a和由尼龙制成且堆叠在第一表面保护层内侧的第二表面保护层1342b。
密封剂层1343可具有由任何一种材料制成的单层结构或者可设为多层。即，袋膜134a可具有复合层结构，所述复合层结构由分别由两种或更多种材料制成的层构成。在该情况中，多个密封剂层1343可包括由酸改性的聚丙烯(PPa)制成且形成在最内层的第一密封剂层1343a和由流延聚丙烯(Casted Polypropylene,CPP)制成且堆叠在第一密封剂层外侧的第二密封剂层1343b。
本实用新型所属技术领域的普通技术人员将理解，在不改变技术思想或基本特征的情况下，本实用新型可以其他具体形式实施。因此，以上揭示的实施方式应被看作是说明性的而非限制性的。因此，本实用新型的范围由所附权利要求书限定而不由前述描述和其中描述的示例性实施方式限定。在本实用新型的权利要求书的等同物的含义内以及权利要求书内做出的各种修改应被视为在本实用新型的范围内。

Claims (14)

1.一种用于二次电池的袋，包括：
表面保护层，所述表面保护层由第一聚合物制成且形成在所述袋的最外层；
密封剂层，所述密封剂层由第二聚合物制成且形成在所述袋的最内层；
气体阻挡层，所述气体阻挡层由金属制成且堆叠在所述表面保护层与所述密封剂层之间；和
散热层，所述散热层由陶瓷制成，堆叠在所述表面保护层与所述密封剂层之间，并且当所述散热层被施加特定压力时向外释放热量。
2.如权利要求1所述的袋，其中所述陶瓷包括λ-五氧化三钛。
3.如权利要求2所述的袋，其中当被施加大于60MPa的压力时所述陶瓷转化成β-五氧化三钛。
4.如权利要求1所述的袋，其中设置有多个气体阻挡层。
5.如权利要求4所述的袋，其中所述散热层堆叠在所述多个气体阻挡层之间。
6.如权利要求1所述的袋，其中所述散热层堆叠在所述气体阻挡层内侧。
7.如权利要求1所述的袋，其中设置有多个表面保护层。
8.如权利要求7所述的袋，其中所述多个表面保护层包括：
由聚对苯二甲酸乙二醇酯制成且形成在最外层的第一表面保护层；和
由尼龙制成且堆叠在所述第一表面保护层内侧的第二表面保护层。
9.如权利要求1所述的袋，其中设置有多个密封剂层。
10.如权利要求9所述的袋，其中所述多个密封剂层包括：
由酸改性的聚丙烯制成且形成在最内层的第一密封剂层；和
由流延聚丙烯制成且堆叠在所述第一密封剂层外侧的第二密封剂层。
11.一种袋型二次电池，包括：
其中交替堆叠有电极和隔膜的电极组件；和
被配置为容纳所述电极组件的袋型二次电池壳体，
其中所述袋型二次电池壳体包括：
表面保护层，所述表面保护层由第一聚合物制成且形成在所述袋型二次电池壳体的最外层；
密封剂层，所述密封剂层由第二聚合物制成且形成在所述袋型二次电池壳体的最内层；
气体阻挡层，所述气体阻挡层由金属制成且堆叠在所述表面保护层与所述密封剂层之间；和
散热层，所述散热层由陶瓷制成，堆叠在所述表面保护层与所述密封剂层之间，并且当所述散热层被施加特定压力时向外释放热量。
12.如权利要求11所述的袋型二次电池，其中所述陶瓷包括λ-五氧化三钛。
13.如权利要求11所述的袋型二次电池，其中设置有多个气体阻挡层。
14.如权利要求13所述的袋型二次电池，其中所述散热层堆叠在所述多个气体阻挡层之间。
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EP3758133A4 (en) 2021-06-02
JP2021517710A (ja) 2021-07-26
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