CN114424381A - 二次电池和包括该二次电池的装置 - Google Patents
二次电池和包括该二次电池的装置 Download PDFInfo
- Publication number
- CN114424381A CN114424381A CN202080064221.9A CN202080064221A CN114424381A CN 114424381 A CN114424381 A CN 114424381A CN 202080064221 A CN202080064221 A CN 202080064221A CN 114424381 A CN114424381 A CN 114424381A
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- Prior art keywords
- secondary battery
- poly
- electrode assembly
- battery according
- insulator
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Classifications
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- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
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Abstract
根据本发明的实施方式的二次电池包括:卷芯型电极组件;设置在所述电极组件顶部的顶部绝缘体;以及设置在所述电极组件底部的底部绝缘体,其中,所述顶部绝缘体和所述底部绝缘体中的至少一者包括热敏聚合物,所述热敏聚合物随着温度升高而膨胀。
Description
技术领域
相关申请的交叉引用
本申请要求于2019年11月20日向韩国知识产权局提交的韩国专利申请10-2019-0149721的权益,其公开内容通过引用整体并入本文。
本公开涉及二次电池和包括该二次电池的装置,更具体地涉及具有改善的抗外部冲击和振动的安全性的二次电池和包括该二次电池的装置。
背景技术
随着当今对便携式电子产品如笔记本、摄像机和蜂窝电话的需求迅速增加,并且电动车辆、蓄电电池、机器人、卫星等的机器人的研发处于积极进展,正在对用作驱动电源的二次电池进行大量研究。
安装在电池壳体中的电极组件是具有阴极/隔膜/阳极堆叠结构的发电元件,其可以被充电和放电,并且电极组件被分为卷芯型、堆叠型和堆叠/折叠型。卷芯型电极组件被构造为具有这样的结构,其中在将隔膜插入阴极和阳极之间的状态下卷绕施加有活性材料的长片型阴极和长片型阳极,堆叠型电极组件被构造为具有这样的结构,其中在将隔膜插入阴极和阳极之间的状态下依次堆叠具有预定尺寸的大量阴极和具有预定尺寸的大量阳极,并且堆叠/折叠型电极组件是卷芯型电极组件和堆叠型电极组件的组合。其中,卷芯型电极组件具有制造容易和单位重量能量密度高的优点。
这种二次电池包括例如镍镉电池、镍氢电池、镍锌电池、锂二次电池等。其中,由于锂二次电池与镍基二次电池相比具有几乎没有记忆效应的优点,因此可以自由充电和放电,并且具有非常低的自放电率、高工作电压和每单位重量的高能量密度,因此广泛用于先进电子器件领域。
根据电池壳体的形状,二次电池可分为:圆柱形电池,其中电极组件安装在圆柱形金属罐中;棱柱形电池,其中电极组件安装在棱柱形金属罐中;或袋形电池,其中电极组件安装在由铝层压板形成的袋形壳体中。其中,圆柱形电池的优点在于其具有相对较大的容量并且结构稳定。然而,圆柱形电池就其结构而言可能受到垂直方向而不是左右方向上的振动和冲击的极大影响。当这种电极组件在没有任何特殊措施的情况下暴露于垂直方向上的振动和冲击时,电极组件或内部部件可能发生损坏,这导致性能劣化。
因此,需要开发一种即使在暴露于强振动或冲击时也能够保持其性能的二次电池。
发明内容
技术问题
本公开的实施方式被设计为解决先前提出的方法的上述问题,并且本公开的目的是提供一种通过固定内部电极组件即使在暴露于外部振动或冲击时也具有改善的安全性的二次电池以及包括该二次电池的装置。
然而,本公开的实施方式所要解决的问题不限于上述问题,并且可以在本公开所包括的技术思想的范围内进行各种扩展。
技术方案
根据本公开实施方式的二次电池包括:卷芯型电极组件;位于所述电极组件的顶部的顶部绝缘体;以及位于所述电极组件的底部的底部绝缘体,其中,所述顶部绝缘体和所述底部绝缘体中的至少一者包括根据温度升高而膨胀的温敏聚合物。
所述温敏聚合物可以包括pNIPAAm(聚(N-异丙基丙烯酰胺))、pDEAM(聚(N,N-二乙基丙烯酰胺))、pNEMAM(聚(N-乙基甲基丙烯酰胺))、pMVE(聚(甲基乙烯基醚))、pEOVE(聚(2-乙氧基乙基乙烯基醚))、pNVCa(聚(N-乙烯基己内酰胺))、pNVIBAM(聚(N-乙烯基异丁酰胺))和pNVBAM(聚(N-乙烯基-正丁酰胺))中的至少一种。
所述顶部绝缘体和所述底部绝缘体中的至少一者可以包括绝缘纤维和涂覆在所述绝缘纤维的表面上的涂层,并且所述涂层可以包括所述温敏聚合物。
所述绝缘纤维可以包括聚乙烯、聚丁烯、聚苯乙烯、聚对苯二甲酸乙二醇酯、聚丙烯、玻璃纤维、天然橡胶和合成橡胶中的至少一种。
所述二次电池可以进一步包括从所述电极组件向上延伸的阴极接头,其中,在所述顶部绝缘体中形成有供所述阴极接头穿过的开口部。
凝胶型构件可以位于所述开口部的内壁和所述阴极接头之间。
所述凝胶型构件可以包括所述温敏聚合物。
在所述开口部的内壁上可以形成含有自愈粘结剂的内壁涂层。
所述自愈粘结剂可以包括CMC材料(陶瓷基质复合材料)、精氨酸酯材料和壳聚糖材料中的至少一种。
所述二次电池可以进一步包括用于存储所述电极组件的圆柱形壳体。
所述电极组件可以被固定在所述顶部绝缘体和所述底部绝缘体之间。
有利效果
根据本公开的实施方式,可以提供一种二次电池,借助含有温敏聚合物的绝缘体即使在暴露于外部振动或冲击时也能够固定电极组件的二次电池。因此,可以提高二次电池和包括该二次电池的装置的安全性和耐久性。
附图说明
图1是根据本公开的一个实施方式的二次电池的截面立体图;
图2是示出包含在图1的二次电池中的顶部绝缘体的平面图;
图3是示出沿图2的线A-A'截取的截面的一部分的视图;以及
图4和图5是示出图1的部分“A”的放大局部视图。
具体实施方式
在下文中,将参照附图详细描述本公开的各种实施方式,使得本领域技术人员可以容易地实现它们。本公开可以以各种不同方式进行修改,并且不限于在此阐述的实施方式。
为了清楚地描述本公开,将省略与描述无关的部分,并且在整个说明书中,相同的附图标记表示相同的元件。
此外,在附图中,为了便于描述,任意示出了每个元件的尺寸和厚度,并且本公开不必限于附图中示出的那些。在附图中,为了清楚起见,夸大了层、区域等的厚度。在附图中,为了便于描述,一些层和区域的厚度被夸大示出。
此外,应当理解,当诸如层、膜、区域或板的元件被称为在另一元件“上”或“上方”时,它可以直接在另一元件上,或者也可以存在中间元件。相反,当一个元件被称为“直接在另一个元件上”时,这意味着不存在其它中间元件。此外,词语“在……上”或“在……之上”意味着设置在参考部分之上或之下,并且不一定意味着设置在参考部分朝向重力的相反方向的上端。
此外,在整个说明书中,当一部分被称为“包括”某一部件时,这意味着该部分可以进一步包括其它部件,而不排除其它部件,除非另有说明。
此外,在整个说明书中,当被称为“平面”时,是指当从上侧观察目标部分时,并且当被称为“横截面”时,是指当从垂直切割的截面侧观察目标部分时。
图1是根据本公开的一个实施方式的二次电池100的截面立体图。
参照图1,根据本实施方式的二次电池100包括卷芯型电极组件120、位于电极组件120顶部的顶部绝缘体160和位于电极组件120底部的底部绝缘体170。
电极组件120具有卷芯型结构,其中大量的阴极121和大量的阴极122夹着隔膜123缠绕,并且中心销150可以插入其中心部分。
顶部绝缘体160和底部绝缘体170中的至少一者可以包括根据温度升高而膨胀的温敏聚合物。然而,优选的是,顶部绝缘体160和底部绝缘体170都包括温敏聚合物,用于防止振动等而确保安全。
温敏聚合物是指在各种刺激中对温度敏感地反应并且即使通过小的温度刺激也引起快速的物理或化学变化的聚合物。
根据温度引起体积变化的温敏聚合物可包括pNIPAAm(聚(N-异丙基丙烯酰胺))、pDEAM(聚(N,N-二乙基丙烯酰胺))、pNEMAM(聚(N-乙基甲基丙烯酰胺))、pMVE(聚(甲基乙烯基醚))、pEOVE(聚(2-乙氧基乙基乙烯基醚))、pNVCa(聚(N-乙烯基己内酰胺))、pNVIBAM(聚(N-乙烯基异丁酰胺))和pNVBAM(聚(N-乙烯基-正丁酰胺))中的至少一种。
温敏聚合物是其性质根据外部温度而变化的聚合物,并且可以在特定温度下引起可逆的体积相变。即,包括温敏聚合物的本公开的顶部绝缘体160和底部绝缘体170随着温度升高而膨胀,然后可以在温度恢复时再次返回到其初始状态。
因此,当二次电池100的温度随着外部振动或冲击而升高时,包含温敏聚合物的顶部绝缘体160和底部绝缘体170可膨胀以固定位于其间的电极组件120。特别地,其可用于产生抵抗垂直方向上的振动的缓冲作用并保持二次电池100的性能。
同时,当温度为约45℃或更高时,包含温敏聚合物的顶部绝缘体160和底部绝缘体170膨胀,从而保护电极组件120免受振动。
图2是示出包含在图1的二次电池中的顶部绝缘体的平面图。在下文中,描述顶部绝缘体160以避免重复描述,其中与稍后描述的顶部绝缘体160的特征相同或类似的特征甚至也可应用于底部绝缘体170。图3是示出沿图2的线A-A'截取的截面的一部分的视图。
参考图2和图3,顶部绝缘体160可以包括绝缘纤维180,并且这种绝缘纤维180可以不具有方向性地缠绕以形成非织造织物状形状。绝缘纤维180可以包括聚乙烯、聚丁烯、聚苯乙烯、聚对苯二甲酸乙二醇酯、聚丙烯、玻璃纤维、天然橡胶和合成橡胶中的至少一种。
由于绝缘纤维180,顶部绝缘体160表现出电绝缘性质,并且在图1中,可以通过使电极组件120与电池壳体130的底部131接触来防止短路的发生。
同时,虽然没有具体示出,但是底部绝缘体170也可以包括绝缘纤维,并且表现出电绝缘性质,从而可以通过使电极组件120与电池壳体130的底部131接触来防止发生短路。
可以在绝缘纤维180之间形成大量的空的空间,并且将该顶部绝缘体160浸渍到包含温敏聚合物的溶液中,然后洗涤并干燥,从而可以在绝缘纤维180上形成包含温敏聚合物的涂层190。即,顶部绝缘体160可以包括不具有方向性地缠绕的绝缘纤维180和涂覆在绝缘纤维180的表面上的涂层190,并且涂层190可以包括温敏聚合物。
然而,由于绝缘纤维180之间的大量空的空间,开口孔300可以形成在顶部绝缘体160中。本实施方式中的孔300是指通道状结构,其中绝缘纤维180之间的一些空的空间互连并形成为贯通顶部绝缘体160的上表面和下表面。
如图3所示,即使涂层190形成在绝缘纤维180的表面上,其也不会阻塞形成在顶部绝缘体160中的开口孔300,并且不会干扰气体的流动,使得顶部绝缘体160的透气性不会劣化。
同时,返回参考图1,二次电池100可以通过将电极组件120存储在电池壳体130中,将电解质溶液注入电池壳体130中,然后将盖组件140连接到电池壳体130的顶部来制造。
此时,电池壳体130可包括压接部分132和卷边部分133。
压接部分132是指其中电池壳体130的一部分在电极组件120的中心方向上凹入的部分,其用于盖组件140的稳定联接并防止电极组件120的游动。
卷边部分133位于压接部分132的上方,并且指的是围绕盖组件140的部分,其用于盖组件140的稳定连接。
盖组件140可包括:形成阴极端子的顶盖141;盖板142,从电极组件120向上延伸的阴极接头144连接到其上;以及气密垫圈143。
垫圈143安装在卷边部分133和压接部分132的上内表面上,从而增加盖组件140和电池壳体130之间的密封力。
电池壳体130可以是圆柱形壳体或棱柱形壳体,但优选是如图1所示的圆柱形壳体。
如上所述,阴极接头144可以从电极组件120向上延伸。具体地,阴极接头144可以从电极组件120的阴极121延伸。
阴极接头144连接到盖板142,使得顶盖141可用作阴极端子。开口部161形成在顶部绝缘体160中,并且阴极接头144可以穿过开口部161连接到盖板142。
图4和图5分别是用于解释本发明的修改实施方式的视图,并且是示出图1的部分“A”的放大局部视图。
首先,参照图4,凝胶型构件210可位于开口部161的内壁和阴极接头144之间。
如上所述,阴极接头144穿过开口部161连接到盖板142。如果阴极接头144没有单独的固定装置,则阴极接头144可能会由于外部振动或冲击而被短路。
因此,在该实施方式中,可设置位于开口部161的内壁和阴极接头144之间的凝胶型构件210以填充开口部161的内部空间。因此,由于阴极接头144可以牢固地固定,所以可以防止阴极接头144由于外部振动或冲击而短路。
凝胶型构件210可包括温敏聚合物,并且温敏聚合物可包括pNIPAAm(聚(N-异丙基丙烯酰胺))、pDEAM(聚(N,N-二乙基丙烯酰胺)),pNEMAM(聚(N-乙基甲基丙烯酰胺)),pMVE(聚(甲基乙烯基醚)),pEOVE(聚(2-乙氧基乙基乙烯基醚)),pNVCa(聚(N-乙烯基己内酰胺)),pNVIBAM(聚(N-乙烯基异丁酰胺))和pNVBAM(聚(N-乙烯基-正丁酰胺))中的至少一种。
因此,当二次电池100的温度随着外部振动或冲击而升高时,凝胶型构件210可膨胀并填充由开口部161形成的所有空间,从而可更牢固地固定阴极接头144。
接着,参考图5,在开口部161的内壁上形成包含自愈粘结剂的内壁涂层220。
自愈粘结剂可包括CMC材料(陶瓷基质复合材料)、精氨酸酯材料和壳聚糖材料中的至少一种。因此,内壁涂层220可使用可逆共价键赋予自恢复特性,使得内壁涂层220可展现温敏特性。
在可逆共价键的一个实施例中,当亲水性聚环氧乙烷(PEO)聚合物在约15摄氏度或更高温度下变为疏水性聚苯醚(PPO)时,其可展现温敏特性。
当温度升高时,内壁涂层220可以根据温敏特性而膨胀以牢固地固定阴极接头144,并且可以防止阴极接头144由于外部振动或冲击而短路。
同时,再参考图1,中心销150通常包括金属材料以赋予预定强度,并形成为圆柱形结构,其中板材被弯曲成圆形。除了后面描述的自加热之外,中心销150还可用作通道,用于固定和支撑电极组件120并释放在充电/放电和操作期间由内部反应产生的气体。
同时,注入到电池壳体130中的电解质溶液可以是含锂盐的非水电解质溶液,并且该含锂盐的非水电解质溶液由非水电解质溶液和锂盐组成。本文所用的非水电解质包括非水有机溶剂、有机固体电解质、无机固体电解质等,但不限于此。
作为非水电解质的实例,可以提及非质子有机溶剂,如N-甲基-2-吡咯烷酮、碳酸亚丙酯、碳酸亚乙酯、碳酸亚丁酯、碳酸二甲酯、碳酸二乙酯、γ-丁内酯,1,2-二甲氧基乙烷、四羟基呋喃、2-甲基四氢呋喃、二甲亚砜、1,3-二氧戊环、甲酰胺、二甲基甲酰胺、二氧戊环、乙腈、硝基甲烷、甲酸甲酯、乙酸甲酯、磷酸三酯、三甲氧基甲烷、二氧戊环衍生物、环丁砜、甲基环丁砜、1,3-二甲基-2-咪唑烷酮、碳酸丙烯酯衍生物、四氢呋喃衍生物、醚、丙酸甲酯和丙酸乙酯。
有机固体电解质的实例包括聚乙烯衍生物、聚环氧乙烷衍生物、聚环氧丙烷衍生物、磷酸酯聚合物、聚搅拌赖氨酸、聚酯硫化物、聚乙烯醇、聚偏二氟乙烯和含有离子解离基团的聚合物。
无机固体电解质的实例包括锂(Li)的氮化物、卤化物和硫酸盐,例如Li3N、LiI、Li5NI2、Li3N-LiI-LiOH、LiSiO4、LiSiO4-LiI-LiOH、Li2SiS3、Li4SiO4、Li4SiO4-LiI-LiOH、Li3PO4-Li2S-SiS2。
锂盐是易溶于上述非水电解质的材料。锂盐可包括例如LiCl、LiBr、LiI、LiClO4、LiBF4、LiB10Cl10、LiPF6、LiCF3SO3、LiCF3CO2、LiAsF6、LiSbF6、LiAlCl4、CH3SO3Li、CF3SO3Li、(CF3SO2)2NLi、氯硼烷锂、低级脂族羧酸锂、四苯基硼酸锂和酰亚胺。
此外,为了改善充电/放电特性和阻燃性,非水电解质可进一步包括例如吡啶、亚磷酸三乙酯、三乙醇胺、环醚、乙二胺、正甘醇二甲醚、六磷酰三胺、硝基苯衍生物、硫、醌亚胺染料、N-取代的恶唑烷酮、N,N-取代的咪唑烷、乙二醇二烷基醚、铵盐、吡咯、2-甲氧基乙醇、三氯化铝等。在一些情况下,为了赋予不可燃性,电解质可以进一步包括含卤素的溶剂,例如四氯化碳和三氟化乙烯。此外,为了改善高温保持特性,电解质可以进一步包括二氧化碳气体。此外,还可以包括氟代碳酸乙烯酯(FEC)、丙烯磺内酯(PRS)等。
在一个具体实例中,将锂盐如LiPF6、LiClO4、LiBF4和LiN(SO2CF3)2加入到作为高介电溶剂的EC或PC的环状碳酸酯和作为低粘度溶剂的DEC、DMC或EMC的直链碳酸酯的混合溶剂中,以制备含锂盐的非水电解质。
上述二次电池可应用于各种装置。这些装置可以应用于诸如电动自行车、电动车辆、混合动力车辆的车辆装置,但是本公开不限于此,并且可以应用于可以使用电池模块或包括电池模块的电池组的各种装置。
尽管上面已经详细描述了本公开的优选实施方式,但是本公开的范围不限于此,并且在不脱离权利要求的范围的情况下,本领域技术人员也可以使用所附权利要求中限定的本公开的基本概念来进行各种修改和改进。
附图标记说明
100:二次电池
120:电极组件
130:电池壳体
131:底部部件
132:压接部分
133:卷边部分
140:盖组件
150:中心销
160:顶部绝缘体
161:开口部
170:底部绝缘体
Claims (12)
1.一种二次电池,所述二次电池包括:
卷芯型电极组件;
位于所述电极组件的顶部的顶部绝缘体;以及
位于所述电极组件的底部的底部绝缘体,
其中,所述顶部绝缘体和所述底部绝缘体中的至少一者包括根据温度升高而膨胀的温敏聚合物。
2.根据权利要求1所述的二次电池,其中:
所述温敏聚合物包括pNIPAAm(聚(N-异丙基丙烯酰胺))、pDEAM(聚(N,N-二乙基丙烯酰胺))、pNEMAM(聚(N-乙基甲基丙烯酰胺))、pMVE(聚(甲基乙烯基醚))、pEOVE(聚(2-乙氧基乙基乙烯基醚))、pNVCa(聚(N-乙烯基己内酰胺))、pNVIBAM(聚(N-乙烯基异丁酰胺))和pNVBAM(聚(N-乙烯基-正丁酰胺))中的至少一种。
3.根据权利要求1所述的二次电池,其中:
所述顶部绝缘体和所述底部绝缘体中的至少一者包括绝缘纤维和涂覆在所述绝缘纤维的表面上的涂层,并且
所述涂层包括所述温敏聚合物。
4.根据权利要求3所述的二次电池,其中:
所述绝缘纤维包括聚乙烯、聚丁烯、聚苯乙烯、聚对苯二甲酸乙二醇酯、聚丙烯、玻璃纤维、天然橡胶和合成橡胶中的至少一种。
5.根据权利要求1所述的二次电池,
所述二次电池进一步包括从所述电极组件向上延伸的阴极接头,
其中,在所述顶部绝缘体中形成有供所述阴极接头穿过的开口部。
6.根据权利要求5所述的二次电池,其中:
凝胶型构件位于所述开口部的内壁和所述阴极接头之间。
7.根据权利要求6所述的二次电池,其中:
所述凝胶型构件包括所述温敏聚合物。
8.根据权利要求5所述的二次电池,其中:
在所述开口部的内壁上形成含有自愈粘结剂的内壁涂层。
9.根据权利要求8所述的二次电池,其中:
所述自愈粘结剂包括CMC材料(陶瓷基质复合材料)、精氨酸酯材料和壳聚糖材料中的至少一种。
10.根据权利要求1所述的二次电池,
所述二次电池进一步包括用于存储所述电极组件的圆柱形壳体。
11.根据权利要求1所述的二次电池,其中:
所述电极组件被固定在所述顶部绝缘体和所述底部绝缘体之间。
12.一种包括至少一个根据权利要求1所述的二次电池的装置。
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