CN207209599U - 隔膜卷芯以及隔膜卷绕体 - Google Patents

隔膜卷芯以及隔膜卷绕体 Download PDF

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CN207209599U
CN207209599U CN201720776856.7U CN201720776856U CN207209599U CN 207209599 U CN207209599 U CN 207209599U CN 201720776856 U CN201720776856 U CN 201720776856U CN 207209599 U CN207209599 U CN 207209599U
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barrier film
cylindrical component
film core
core
resin
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佃阳介
屋铺大三郎
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Sumitomo Chemical Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
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    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
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    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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  • Engineering & Computer Science (AREA)
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  • Exhaust Gas After Treatment (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Processes For Solid Components From Exhaust (AREA)
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Abstract

本实用新型的目的在于实现高效地去除端部的形变从而确保了强度的隔膜卷芯，实现如下隔膜卷芯(100)以及在该隔膜卷芯上卷绕非水电解液二次电池用隔膜而成的隔膜卷绕体，提供该隔膜卷绕体的制造方法，隔膜卷芯(100)的特征在于，外侧圆筒构件(101)的外周面的端部的角部被直线状地倒角。

Description

隔膜卷芯以及隔膜卷绕体
技术领域
本实用新型涉及卷绕非水电解液二次电池用隔膜时使用的隔膜卷芯、以及非水电解液二次电池用隔膜卷绕于隔膜卷芯而成的隔膜卷绕体。
背景技术
在专利文献1中，对于一边由辊等搬运系统搬运一边连续地制造的隔膜，列举了关于将所制造的隔膜作为产品而供给时所卷绕的隔膜卷芯(以下，也称作“芯”)的形状的一例。
专利文献1中公开的芯具有供隔膜卷绕的外侧圆筒构件、作为嵌入轴的轴承而发挥功能的内侧圆筒构件、以及与外侧圆筒构件和内侧圆筒构件相连的支承构件(以下，也称作“肋”)，所制造的隔膜作为卷绕于外侧圆筒构件的卷绕体而供给。
在先技术文献
专利文献
专利文献1：日本公开专利公报特开2013-139340号公报(2013年7月18日公开)
然而，上述那样的芯多通过基于向模具注射成为原料的树脂的注射成型的树脂加工来制造。在注射成型中，在相当于芯的角部的模具的端部，所注射的树脂的流动淤积，树脂的分子取向歪斜，因此制造出的芯上产生有残留应力。
如上述那样，存在有残留应力的芯的强度下降，因此在卷绕隔膜时芯的变形变大。若隔膜长时间卷绕于变形的芯的状态持续，则会引起隔膜的变形，从而导致品质的降低。
实用新型内容
实用新型所要解决的课题
本实用新型是鉴于上述的问题点而完成的，其目的在于实现去除端部的形变而从而确保了强度的隔膜卷芯。
用于解决课题的方案
为了解决上述的课题，本实用新型所涉及的隔膜卷芯是供非水电解液二次电池用隔膜卷绕的隔膜卷芯，其特征在于，所述隔膜卷芯具备外侧圆筒构件、设置于所述外侧圆筒构件的内侧的内侧圆筒构件、以及在所述外侧圆筒构件与所述内侧圆筒构件之间沿径向延伸且与所述外侧圆筒构件和所述内侧圆筒构件连接的多个支承构件，所述外侧圆筒构件的外周面的端部的角部被直线状地倒角。
根据上述结构，能够有效地去除在外侧圆筒构件的端部产生的形变。因此，能够提供在充分确保供隔膜卷绕的面的情况下强度强而形变少的隔膜卷芯。
需要说明的是，在对外侧圆筒构件的外周面的端部进行倒角的情况下，考虑到隔膜卷绕体的工序中的作业者的安全、芯掉落时的冲击缓和等情况，可以考虑对端部进行弧形倒角(以下，也称作R倒角)。然而，为了通过对端部进行R倒角而充分地去除残留有形变的端部，与呈直线状地进行倒角的情况相比，需要将倒角的尺寸设定得更大。其结果是，需要预先将芯的宽度设计得较大。相对于此，通过对端部呈直线状地进行倒角，不会过度增大芯的宽度，能够有效地去除在端部产生的形变。
所述的外侧圆筒构件的外周面的端部的角部也可以被实施C倒角。根据上述的结构，不会过度增大芯的宽度，能够更加有效地去除在端部产生的形变。
另外，所述C倒角的尺寸也可以为0.3mm以上。根据上述结构，可确保能够尽量充分去除存在有形变的树脂的倒角部分。
另外，所述C倒角的尺寸也可以为2.5mm以下。根据上述结构，能够有效地防止隔膜卷绕于实施了倒角的位置。
另外，所述C倒角的尺寸也可以为所述外侧圆筒构件的厚度的三分之一以下。根据上述结构，能够充分减少产生破损、缺口的可能性。
另外，所述内侧圆筒构件的内周面的端部的角部也可以被直线状地倒角。根据上述结构，能够容易向内侧圆筒构件插入用于使隔膜卷芯旋转的轴。
另外，本实用新型所涉及的隔膜卷芯的材质也可以包含ABS树脂、聚乙烯树脂、聚丙烯树脂、聚苯乙烯树脂、聚酯树脂、以及氯乙烯树脂的任一方。根据上述结构，能够通过利用了模具的树脂成型来制造芯。
另外，本实用新型所涉及的隔膜卷绕体的特征在于，所述隔膜卷绕体通过在所述隔膜卷芯的外侧圆筒构件的外周面上卷绕隔膜而成。根据上述结构，能够提供隔膜的变形少的高品质的隔膜的隔膜卷绕体。
实用新型效果
本实用新型能够提供端部的树脂的形变少因此强度强且隔膜的变形少的隔膜卷芯、以及供给卷绕于该隔膜卷芯的非水电解液二次电池用隔膜的隔膜卷绕体。
附图说明
图1是示出锂离子二次电池的剖面结构的示意图。
图2是示出图1所示的锂离子二次电池的各状态下的情形的示意图。
图3是示出另一结构的锂离子二次电池的各状态下的情形的示意图。
图4是表示对隔膜进行分切的分切装置的结构的示意图。
图5是本实用新型的实施方式所涉及的隔膜卷芯以及在隔膜卷芯卷绕有隔膜而成的隔膜卷绕体的主视图。
图6是本实用新型的实施方式所涉及的隔膜卷芯的剖视图。
图7是本实用新型的实施方式所涉及的隔膜卷绕体的隔膜卷芯的外侧圆筒构件外周面的放大图。
附图标记说明：
1 锂离子二次电池；2 外部设备；3 锂离子；4 耐热层；11 阴极；12 隔膜；12a 耐热隔膜；13 阳极；100 芯；101 外侧圆筒构件；101A 端部；101B 端部；102 内侧圆筒构件；102A 端部；102B 端部；103 肋；110 隔膜卷绕体。
具体实施方式
以下，根据图1～图7对本实用新型的实施方式进行详细说明。以下，作为卷绕于本实用新型所涉及的隔膜卷芯(芯)的非水电解液二次电池用隔膜的一例，对锂离子二次电池等电池用的耐热隔膜进行说明。
<锂离子二次电池的结构>
首先，根据图1至图3对锂离子二次电池进行说明。
以锂离子二次电池为代表的非水电解液二次电池的能量密度高，因此，目前作为用于个人计算机、便携电话、便携信息终端等设备、机动车、飞机等移动体的电池、以及作为有助于电力的稳定供给的定置用电池而广泛地使用。
图1是示出锂离子二次电池1的剖面结构的示意图。
如图1所示，锂离子二次电池1具备：阴极11、隔膜12以及阳极13。在锂离子二次电池1的外部，在阴极11与阳极13之间连接有外部设备2。而且，电子在锂离子二次电池1的充电时向方向A移动，在放电时向方向B移动。
<隔膜>
隔膜12配置在锂离子二次电池1的正极即阴极11与其负极即阳极13之间，且配置为被阴极11与阳极13夹持。隔膜12将阴极11与阳极13之间分离，同时能够使锂离子在阴极11与阳极13之间移动。作为隔膜12的材料，例如使用聚乙烯、聚丙烯等聚烯烃等。
图2是示出图1所示的锂离子二次电池1的各状态下的情形的示意图。图2的(a)示出通常的情形，图2的(b)示出锂离子二次电池1升温时的情形，图2的(c)示出锂离子二次电池1急剧升温时的情形。
如图2的(a)所示，在隔膜12上设置有多个孔P。通常，锂离子二次电池1的锂离子3能够经由孔P而往返。
在此，例如，有时由于锂离子二次电池1的过充电或者外部设备的短路所引起的大电流等而导致锂离子二次电池1升温。在该情况下，如图2的(b)所示，隔膜12熔化或变得柔软而堵塞孔P。而且隔膜12收缩。由此，锂离子3的往返停止，因此上述的升温也停止。
但是，在锂离子二次电池1急剧地升温的情况下，隔膜12急剧地收缩。在该情况下，如图2的(c)所示，隔膜12有时破裂。然后，锂离子3从破裂的隔膜12漏出，因此锂离子3的往返不停止。因此，温度继续上升。
<耐热隔膜>
图3是示出另一结构的锂离子二次电池1的各状态下的情形的示意图。图3的(a)示出通常的情形，(b)示出锂离子二次电池1急剧升温时的情形。
如图3的(a)所示，锂离子二次电池1还可以具备耐热层4。该耐热层4能够设置于隔膜12。图3的(a)示出在隔膜12上设置有作为功能层的耐热层4的结构。以下，将在隔膜12上设置有耐热层4的膜作为带有功能层的隔膜的一例而设为耐热隔膜12a。另外，将带有功能层的隔膜的隔膜12相对于功能层设为基材。
在图3的(a)所示的结构中，耐热层4层叠于隔膜12的阴极11侧的一面。需要说明的是，耐热层4也可以层叠于隔膜12的阳极13侧的一面，还可以层叠于隔膜12的两面。而且，在耐热层4上也设有与孔P同样的孔。通常，锂离子3经由孔P和耐热层4的孔往返。作为耐热层4的材料，例如包括全芳香族聚酰胺(芳族聚酰胺树脂)。
如图3的(b)所示，即使锂离子二次电池1急剧地升温而隔膜12熔化或变柔软，由于耐热层4辅助隔膜12，因此隔膜12的形状得以维持。因此，停留在隔膜12熔化或变柔软而堵塞孔P的状态。由此，由于锂离子3的往返停止，从而上述的过放电或过充电也停止。这样，隔膜12的破裂得以抑制。
<隔膜、耐热隔膜的制造工序>
锂离子二次电池1的隔膜以及耐热隔膜的制造并没有特别限定，可以利用公知的方法来进行。以下，假设隔膜(耐热隔膜)的原料即多孔质膜主要包含聚乙烯作为其材料的情况来进行说明。但是，即便在多孔质膜包含其他材料的情况下，也能够通过同样的制造工序来制造隔膜(耐热隔膜)。
例如，能够举出在向热塑性树脂添加无机填充剂或增塑剂而进行膜成形之后，利用适当的溶剂将该无机填充剂以及该增塑剂清洗去除的方法。例如，在多孔质膜为由包含超高分子量聚乙烯的聚乙烯树脂形成的聚烯烃隔膜的情况下，能够通过以下所示的方法进行制造。
该方法包括如下工序：(1)将超高分子量聚乙烯与无机填充剂(例如碳酸钙、二氧化硅)或增塑剂(例如低分子量聚烯烃、液体石蜡)混制而获得聚乙烯树脂组合物的混制工序；(2)使用聚乙烯树脂组合物来成形膜的压延工序；(3)从通过工序(2)获得的膜中去除无机填充剂或增塑剂的去除工序；以及(4)将通过工序(3)获得的膜拉伸而获得多孔质膜的拉伸工序。需要说明的是，也可以在所述工序(2)与(3)之间进行所述工序(4)。
通过去除工序而在膜中设置许多细微孔。通过拉伸工序拉伸后的膜的细微孔成为上述的孔P。由此，获得具有规定厚度和透气度的聚乙烯微多孔膜，即多孔质膜(隔膜12)。
需要说明的是，在混制工序中，也可以将超高分子量聚乙烯100重量份、重量平均分子量为1万以下的低分子量聚烯烃5～200重量份、以及无机填充剂100～400重量份混制。
然后，在涂敷工序中，在多孔质膜的表面形成耐热层4。例如，在多孔质膜上涂布芳族聚酰胺/NMP(N-甲基-吡咯烷酮)溶液(涂敷液)而形成作为芳族聚酰胺耐热层的耐热层4。耐热层4可以仅设置于多孔质膜的一面，也可以设置于两面。另外，作为耐热层4，也可以涂敷包含氧化铝/羧甲基纤维素等填充物的混合液。
另外，在涂敷工序中，也可以在多孔质膜的表面涂布聚偏氟乙烯/二甲基乙酰胺溶液(涂敷液)(涂布工序)，并使其析出(析出工序)，从而在多孔质膜的表面形成粘接层。粘接层可以仅设置在多孔质膜的一面，也可以设置在多孔质膜的两面。
将涂敷液涂敷于多孔质膜的方法不受特别限定，只要是能够均匀地进行湿涂的方法即可，能够采用以往公知的方法。例如，能够采用毛细管涂布法、旋涂法、挤出式涂布法、喷涂法、浸涂法、辊式涂布法、丝网印刷法、柔性印刷法、棒涂法、凹版涂布法、模涂布法等。耐热层4的厚度能够由涂敷湿膜的厚度、涂敷液中的固体成分浓度来控制。
需要说明的是，作为在涂敷时固定或搬运聚烯烃基材多孔质膜的支承体，能够使用树脂制的膜、金属制的带、滚筒等。
如以上那样，能够制造在多孔质膜上层叠有耐热层4的隔膜12(耐热隔膜)。制造出的隔膜被卷绕于圆筒形状的芯。需要说明的是，通过以上的制造方法制造的对象并不局限于耐热隔膜。该制造方法也可以不包括涂敷工序。在该情况下，所制造的对象为不具有耐热层的隔膜。
<分切装置>
耐热隔膜或不具有耐热层的隔膜(以下称为“隔膜”)优选采用适于锂离子二次电池1等应用产品的宽度(以下称为“产品宽度”)。但是，为了提高生产性，隔膜的宽度要制造为产品宽度以上。而且，制造后，隔膜还要被切断(分切)为产品宽度。
需要说明的是，“隔膜的宽度”是指，相对于隔膜延伸的平面平行且相对于隔膜的长度方向垂直的方向的、隔膜的长度。以下将分切前的宽度宽的隔膜称为“卷料”，将分切后的隔膜特别称为“分切隔膜”。另外，分切是指将隔膜沿着长度方向(隔膜在制造中的流动方向，MD：Machine direction)切断，切割是指将隔膜沿着横切方向(TD：transversedirection)切断。横切方向(TD)是指相对于隔膜延伸的平面平行且相对于隔膜的长度方向(MD)大致垂直的方向。
图4是示出对隔膜进行分切的分切装置6的结构的示意图，(a)示出整体结构，(b)示出对卷料进行分切前后的结构。
如图4的(a)所示，分切装置6具备被支承为能够旋转的圆柱形状的卷出辊61、辊62～69以及多个卷绕辊70U、70L。
<分切前>
在分切装置6中，卷绕有卷料的圆筒形状的芯c嵌于卷出辊61。如图4的(b)所示，卷料从芯c向路径U或L卷出。卷出的卷料经由辊63～67向辊68搬运。在搬运的工序中，卷料被分切成多个隔膜。需要说明的是，为了以希望的轨道来搬运卷料，也可以变更辊62～69的个数以及配置。
<分切后>
如图4的(b)所示，多个分切隔膜的一部分分别向嵌于卷绕辊70U的圆筒形状的各芯u(隔膜卷芯)卷绕。另外，多个分切隔膜的另一部分分别向嵌于卷绕辊70L的圆筒形状的各芯1(隔膜卷芯)卷绕。需要说明的是，将卷绕成辊状的分切隔膜及芯u、1的一体物称为“卷绕体(隔膜卷绕体)”。
本实用新型涉及供上述分切隔膜等非水电解液二次电池用隔膜卷绕的芯(隔膜卷芯)、以及非水电解液二次电池用隔膜卷绕于该芯而成的隔膜卷绕体。
<隔膜卷芯以及隔膜卷绕体>
以下，根据图5～7对本实用新型的隔膜卷芯进行说明。
图5是芯以及芯上卷绕有隔膜而成的隔膜卷绕体的主视图。
卷绕辊等的轴嵌入图5的(a)所示的芯100的内侧圆筒构件102，通过一边使芯100旋转一边以恒定的张力将隔膜12卷绕于外侧圆筒构件101，能够制造图5的(b)所示的隔膜卷绕体110。
上述的芯100例如能够应用于图4所示的分切装置4的芯u、1。即，使用芯100的隔膜12的卷绕能够与上述的方法同样地进行。
<芯的构造>
图5的(a)所示的芯100具备外侧圆筒构件101、内侧圆筒构件102、以及多个肋103。外侧圆筒构件101形成供隔膜卷绕的芯100的外周面。内侧圆筒构件102设置于外侧圆筒构件101的内侧，作为供使芯旋转的卷绕辊等的轴嵌入的轴承而发挥功能。肋103是在外侧圆筒构件101与内侧圆筒构件102之间沿径向延伸且与外侧圆筒构件101和内侧圆筒构件102连接的支承构件。
在本实施方式中，肋103相互均匀地隔开间隔，以与外侧圆筒构件101和内侧圆筒构件102垂直的方式分别配置在将圆周8等分的位置。但是，肋的个数、配置的间隔不限定于此。
另外，优选外侧圆筒构件101与内侧圆筒构件102的圆周中心大致一致，但不限定于此。并且，外侧圆筒构件101以及内侧圆筒构件102的厚度、外周面的宽度、以及半径等尺寸能够根据所制造的非水电解液二次电池用隔膜的种类等而适当设计。
芯100的材质能够适当地采用包括ABS树脂、聚乙烯树脂、聚丙烯树脂、聚苯乙烯树脂、聚酯树脂、以及氯乙烯树脂的任一方的树脂。由此，能够通过利用了模具的树脂成型来制造芯100。
<45°倒角>
图6是图5的(a)所示的芯100的A-A’线向视剖视图。
如图6所示，对外侧圆筒构件101的外周面的端部101A、101B的角部实施了45°倒角。另外，与外侧圆筒构件101的外周面的端部101A、101B同样地，对内侧圆筒构件102的内周面的端部102A、102B的角部也实施了45°倒角。
在本说明书中，将45°±5°倒角称作C倒角。换句话说，上述45°倒角为C倒角的一个方式。基于更加有效地去除在端部产生的形变的观点，C倒角优选为45°±2°，更优选为45°±1°。
C倒角是指，将距构件端部的角的前端规定的尺寸的构件沿构件表面的倾斜45°±5°方向去除的倒角。如外侧圆筒构件101等所列举那样，在端部101A、101B的角部呈大致直角的情况下，使从角部到一个面的规定位置的尺寸与从角部到另一个面的规定位置的尺寸相等，若利用连接上述两点的规定位置的面来去除构件，则能够实现C倒角。
这样，通过对芯100的端部101A、101B、102A、102B进行倒角加工，能够消除由注射成形产生的残留形变部分。
另外，通过对内侧圆筒构件102的端部102A、102B进行倒角加工，从而容易将卷绕辊等的轴插入内侧圆筒构件102。
作为形成倒角的方法，可以列举在成型(注射成型)出具有角部的构件后将该角部切除的方法、以及使用预先带有倒角形状的模具来成型(注射成型)构件的方法。在前者的情况下，在将注射成型用的树脂流入口(浇口)设置在倒角的部分时，能够将该浇口痕迹与倒角同时去除。在后者的情况下，在模具内树脂不会淤积而进行流动，因此成形体(构件)中难以残留有形变。
<外侧圆筒构件的C倒角>
图7是隔膜卷绕体的隔膜卷芯的外侧圆筒构件的放大剖视图。需要说明的是，为了方便，对于隔膜卷绕体110的其他构件省略侧图示。
图7是隔膜卷绕体110的外侧圆筒构件101的放大剖视图。
隔膜12卷绕于芯100的外侧圆筒构件101的外周面。此时，在外侧圆筒构件101的外周面的施加有C倒角的位置不卷绕隔膜12。如上所述，通过以不与倒角位置接触的方式卷绕隔膜12，能够防止隔膜12的破损、变形。
因此，在供隔膜12卷绕的外侧圆筒构件101的外周面，未施加C倒角的面的宽度需要比隔膜12的宽度大。若采用该结构，则通过以隔膜12与外侧圆筒构件101的外周面的宽度的中心大致一致的方式进行卷绕，能够以隔膜12不与外侧圆筒构件101的外周面中的C倒角位置接触的方式进行卷绕。
为了制造这种芯100，在注射成形芯100时，考虑隔膜12的宽度与C倒角的尺寸而设计外侧圆筒构件101的宽度尺寸。
在通过上述的C倒角去除残留有形变的树脂的情况下，C倒角的尺寸优选至少为0.3mm。若比该尺寸大地去除树脂，则能够充分消除残留有形变的树脂。
另外，上述C倒角的尺寸优选为2.5mm以下，更优选为1mm以下，上述C倒角的尺寸表示从假设无倒角的情况下的角部的位置到开始进行倒角的位置的距离。若采用该尺寸，则能够在供隔膜12卷绕的外侧圆筒构件101的外周面充分确保未实施倒角的位置。因此，能够有效地防止隔膜12卷绕在外侧圆筒构件101的倒角位置上。
此时，在以使角部带有圆角的方式进行R倒角而去除端部的树脂的情况下，为了去除与C倒角相同程度的体积的树脂，需要将R倒角的尺寸设为C倒角的尺寸的约1.5倍。
因此，与采用R倒角相比，在采用C倒角的情况下，能够减小为了以隔膜12不与外侧圆筒构件101的外周面的倒角位置接触的方式进行卷绕而必须确保的外侧圆筒构件101的宽度。
由于能够减小外侧圆筒构件101的宽度，因此有助于芯100、隔膜卷绕体110的轻型化、成本降低。
并且，对于内侧圆筒构件102的内周面，与R倒角相比也优选实施C倒角。这是由于端部具有曲面，从而在采用具有45°±5°的倾斜的面的情况下，轴容易插入。
除上述以外，也可以对外侧圆筒构件101的内周面、内侧圆筒构件102的外周面、以及肋103适当地进行倒角加工。与上述同样，可以实施C倒角，但也可以实施R倒角、轻倒角等各种各样的倒角加工。
另外，在对外侧圆筒构件101、内侧圆筒构件102、或者肋103实施上述C倒角的情况下，上述C倒角的尺寸优选为上述构件的厚度的三分之一以下。若采用该尺寸，则能够充分减少产生破损、缺口的可能性。
需要说明的是，在上述的说明中，列举对端部101A、101B、102A、102B实施了C倒角的芯100为例来进行说明，但倒角的角度不限定于45°，对于本实施方式的芯100，只要对端部101A、101B、102A、102B实施直线状的倒角加工即可。
<总结>
如上述那样，实施了C倒角的芯100去除了残留有形变的树脂，因此维持高强度而不易变形。因此，隔膜12卷绕于芯100而成的隔膜卷绕体110能够提供变形少的高品质的隔膜12。
本实用新型并不限定于上述的实施方式，在技术方案所示的范围内可以进行各种变更。

Claims (9)

1.一种隔膜卷芯，其供非水电解液二次电池用隔膜卷绕，其特征在于，
所述隔膜卷芯具备外侧圆筒构件、设置于所述外侧圆筒构件的内侧的内侧圆筒构件、以及在所述外侧圆筒构件与所述内侧圆筒构件之间沿径向延伸且与所述外侧圆筒构件和所述内侧圆筒构件连接的多个支承构件，
所述外侧圆筒构件的外周面的端部的角部被直线状地倒角。
2.根据权利要求1所述的隔膜卷芯，其特征在于，
所述外侧圆筒构件的外周面的端部的角部被实施C倒角。
3.根据权利要求2所述的隔膜卷芯，其特征在于，
所述C倒角的尺寸为0.3mm以上。
4.根据权利要求3所述的隔膜卷芯，其特征在于，
所述C倒角的尺寸为2.5mm以下。
5.根据权利要求3所述的隔膜卷芯，其特征在于，
所述C倒角的尺寸为所述外侧圆筒构件的厚度的三分之一以下。
6.根据权利要求1至5中任一项所述的隔膜卷芯，其特征在于，
所述内侧圆筒构件的内周面的端部的角部被直线状地倒角。
7.根据权利要求1至5中任一项所述的隔膜卷芯，其特征在于，
所述隔膜卷芯的材质包含ABS树脂、聚乙烯树脂、聚丙烯树脂、聚苯乙烯树脂、聚酯树脂、以及氯乙烯树脂的任一方。
8.根据权利要求6所述的隔膜卷芯，其特征在于，
所述隔膜卷芯的材质包含ABS树脂、聚乙烯树脂、聚丙烯树脂、聚苯乙烯树脂、聚酯树脂、以及氯乙烯树脂的任一方。
9.一种隔膜卷绕体，其特征在于，
所述隔膜卷绕体通过在权利要求1至8中任一项所述的隔膜卷芯的外侧圆筒构件的外周面上卷绕非水电解液二次电池用隔膜而成。
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