CN104170154A - 电池的制造方法 - Google Patents
电池的制造方法 Download PDFInfo
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- H—ELECTRICITY
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- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
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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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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
本发明的实施方式提供一种电池的制造方法,其包括注液工序、第1密封工序、至少包括充电的工序、气体放出工序和第2密封工序。在注液工序中,通过在外装构件上开口形成的注液口向包含电极的外装构件内注入电解液。在第1密封工序中,密封注液口。在气体放出工序中,在外装构件上开口形成排气孔,使外装构件内的气体从排气孔放出。在第2密封工序中,密封排气孔。
Description
技术领域
本发明的实施方式涉及电池的制造方法。
背景技术
近年来,正在快速普及的混合动力电动汽车、插入式电动汽车等电动汽车的电源主要使用了能够充放电的长方体形的非水电解质电池,例如锂离子电池。锂离子电池是将电极群和非水电解质收纳于铝或铝合金制的呈长方体形的壳体中而构成的,所述电极群是隔着隔膜将正极和负极卷绕或叠层而成的。
就锂离子电池这样的非水电解质电池而言,无法避免水分在制造工序中混入电池内,从而存在电池壳体的内压会因水被电解所产生的气体而上升的问题。
现有技术文献
专利文献
专利文献1:日本特开2006-331828号公报
专利文献2:日本特开2007-59145号公报
发明内容
发明所要解决的课题
本发明所要解决的课题在于:提供能够抑制外装构件膨胀的电池的制造方法。
用于解决课题的手段
实施方式提供一种电池的制造方法,其包括注液工序、第1密封工序、至少包括充电的工序、气体放出工序和第2密封工序。在注液工序中,通过在外装构件上开口形成的注液口向包含电极的外装构件内注入电解液。在第1密封工序中,密封注液口。在气体放出工序中,在外装构件上开口形成排气孔,使外装构件内的气体从排气孔放出。在第2密封工序中,密封排气孔。
附图说明
图1是实施方式的电池的立体展开图。
图2是从下方观察图1所示的电池时的局部立体展开图。
图3是用于图1所示的电池的电极群的局部立体展开图。
图4是图1所示的电池的俯视图。
图5是表示与图1所示的电池有关的气体放出工序的剖视图。
图6是表示与图1所示的电池有关的第2密封工序的剖视图。
图7是由实施方式的方法制得的电池的立体图。
图8是实施方式的电池的俯视图。
具体实施方式
下面,参照附图对实施方式进行说明。
(实施方式)
实施方式的电池的制造方法包括注液工序、第1密封工序、至少包括充电的工序、气体放出工序和第2密封工序。
将经过注液工序和第1密封工序的电池的一个例子示于图1~图4。图1~图4所示的电池是经过包括充电的工序、气体放出工序和第2密封工序而成为密闭型的方形非水电解质电池的。电池包含外装构件1、收纳于外装构件1内的扁平形电极群2和含浸在扁平形电极群2中的非水电解液(未图示)。外装构件1具有有底方筒形容器3和例如通过焊接而固定在容器3的开口部的封口板4。
如图3所示,扁平形电极群2是通过将正极5和负极6在它们之间隔着隔膜7卷绕成扁平状而得到的。正极5包含例如由金属箔形成的带状的正极集电体、由正极集电体的与长边平行的一端部形成的正极集电极耳5a和至少形成于除去正极集电极耳5a部分的正极集电体上的正极活性物质层5b。另一方面,负极6包含例如由金属箔形成的带状的负极集电体、由负极集电体的与长边平行的一端部形成的负极集电极耳6a和至少形成于除去负极集电极耳6a部分的负极集电体上的负极活性物质层6b。
对于这样的正极5、隔膜7和负极6,错开正极5和负极6的位置而进行卷绕,以使得正极集电极耳5a沿电极群的卷绕轴方向从隔膜7突出,并且负极集电极耳6a沿其相反方向从隔膜7突出。通过这样卷绕,电极群2如图3所示,以漩涡状卷绕而成的正极集电极耳5a从一个端面突出,并且以漩涡状卷绕而成的负极集电极耳6a从另一个端面突出。
如图1和图2所示,正极引线8具有用于与正极端子9电连接的连接板8a、在连接板8a上开口形成的贯通孔8b和由连接板8a分叉成两股并向下方延伸出来的条状的集电部8c。正极引线8的集电部8c在它们之间夹持电极群2的正极集电极耳5a,通过焊接而与正极集电极耳5a电连接。另一方面,负极引线10具有用于与负极端子11电连接的连接板10a、在连接板10a上开口形成的贯通孔10b和由连接板10a分叉成两股并向下方延伸出来的条状的集电部10c。负极引线10的集电部10c在它们之间夹持电极群2的负极集电极耳6a,通过焊接而与负极集电极耳6a电连接。将正负极引线8、10与正负极集电极耳5a、6a电连接的方法没有特别限定,例如可以列举出超声波焊接、激光焊接等焊接。
电极防护罩(electrode guard)12具有覆盖正负极集电极耳5a、6a的端面的侧板12a和为了覆盖正负极集电极耳5a、6a的最外周而以U字形弯曲而成的侧板12b。对于电极防护罩12的上端而言,由于从此处插入电极群2,因此是开放的。电极群2的正极集电极耳5a以焊接有正极引线8的集电部8c的状态被电极防护罩12所被覆。正极引线8的连接板8a位于电极防护罩12的上方。另一方面,电极群2的负极集电极耳6a以焊接有负极引线10的集电部10c的状态被电极防护罩12所被覆。负极引线10的连接板10a位于电极防护罩12的上方。两个电极防护罩12通过绝缘胶带13而与电极群2固定。
如图1和图2所示,封口板4为矩形板状。封口板4具有用于安装正负极端子9、11的贯通孔4a、4b。另外,封口板4具有注液口和板厚薄的薄壁部15。注液口在通过其注入电解液后被第1密封盖14所密封。第1密封盖14为圆板状。第1密封盖14例如通过焊接而与封口板4的表面固定。图4示出安装有第1密封盖14的封口板4的俯视图。图4中用15表示的构件为薄壁部。薄壁部15由在比封口板4的板厚更薄的圆形区域形成有十字形的槽的材料形成。另外,也可以没有十字形的槽。此外,比封口板4的板厚更薄的区域的形状不限于圆形,例如可以为三角形、四边形等多边形、椭圆等。第1密封盖14例如由铝、铝合金等金属形成。另外,第1密封盖14的形状不限于圆板状,可以根据注液口的形状而变更。
如图1和图2所示,绝缘板16在一个端部具有收纳正极引线8的连接板8a的凹部16a,并且在另一个端部具有收纳负极引线10的连接板10a的凹部16b。在凹部16a与凹部16b之间开口,使封口板4的背面露出。另外,绝缘板16的凹部16a和凹部16b分别具有与封口板4的贯通孔4a、4b连通的贯通孔。绝缘板16配置于封口板4的背面上。
正负极端子9、11分别具有矩形板状的突起部9a、11a和从突起部9a、11a延伸出来的轴部9b、11b。另外,绝缘垫圈17具有插入正负极端子9、11的轴部9b、11b的贯通孔17a。正极端子9的轴部9b插入绝缘垫圈17的贯通孔17a、封口板4的贯通孔4a、绝缘板16的贯通孔、正极引线8的连接板8a的贯通孔8b中,从而被这些构件铆接固定。由此,正极端子9经由正极引线8而与正极集电极耳5a电连接。另一方面,负极端子11的轴部11b插入绝缘垫圈17的贯通孔17a、封口板4的贯通孔4b、绝缘板16的贯通孔、负极引线10的连接板10a的贯通孔10b中,从而被这些构件铆接固定。由此,负极端子11经由负极引线10而与负极集电极耳6a电连接。
图1~图4所示的电池例如通过以下方法进行制作。制作电极群2,将所得到的电极群2干燥,然后在电极群2的正负极集电极耳5a、6a上焊接正负极引线8、10。接着,在电极群2的正负极集电极耳5a、6a上安装电极防护罩12,以绝缘胶带13将电极防护罩12与电极群2固定。接着,通过铆接固定将正负极端子9、11、封口板4、正负极引线8、10一体化,然后通过焊接将封口板4与容器1的开口部固定。接着,将残存于容器1内的水分从封口板4的注液口除去,之后从注液口注入电解液。接着,以第1密封盖14密封注液口,由此进行第1密封。
对于进行了第1密封的电池,进行至少实施充电的工序。在该工序中,充电后可以根据需要实施放电或老化。另外,也可以进行多次充放电。在电池的外装构件内存在干燥工序中未被完全除去的水分。该水分在首次充电、其以后的充电或者老化中被电解,因此产生气体。该气体在以下说明的气体放出工序中被除去。
参照图5对气体放出工序进行说明。如图5所示,在薄壁部15内的凹部插入并压接波纹管18,对波纹管18内进行抽吸,从而使其为负压。接着,将前端锐利的形状的工作销19作为断裂构件而插入波纹管18内,若用工作销19刺破薄壁部15,则外装构件1内的气体放出。由此,能够减小使用中的电池膨胀。放出的气体中含有非水电解液等。因此,优选使放出气体的气氛为负压,从而防止气体向宽范围扩散。另外,代替使用波纹管,在手套箱等密闭空间内用工作销19刺破薄壁部15,使气体放出到密闭空间内,之后回收密闭空间内的气体,从而能够防止气体向宽范围扩散。
接着,进行第2密封工序。参照图6对第2密封工序进行说明。在封口板4上存在由薄壁部15开口而形成的开口部20。通过在封口板4的表面上配置圆形的第2密封盖21,用第2密封盖21覆盖开口部20,并通过焊接将第2密封盖21与封口板4固定,从而进行第2密封。将进行了第2密封的电池的立体图示于图7。第2密封盖21例如由铝、铝合金等金属形成。
在第2密封工序后且发货前可以实施充放电循环。
另外,图4中设置了一个排气用薄壁部15,但可以使排气用薄壁部15的数量为多个。将其一个例子示于图8。由此,也可以使排气的次数为多次,例如在首次充电时在制造工序中混入电池内的水分未充分气化的情况下,也可以在第2次充电、第3次充电时使其气化而实施排气。
这里,对正负极的活性物质、隔膜、非水电解液、容器、封口板和电极防护罩进行说明。
正极活性物质没有特别限定,可以列举出各种氧化物,例如含锂的钴氧化物(例如LiCoO2)、二氧化锰、锂锰复合氧化物(例如LiMn2O4、LiMnO2)、含锂的镍氧化物(例如LiNiO2)、含锂的镍钴氧化物(例如LiNi0.8Co0.2O2)、含锂的铁氧化物、含锂的钒氧化物、二硫化钛、二硫化钼等硫属化合物等。
负极活性物质没有特别限定,例如可以列举出石墨质材料或碳质材料(例如石墨、焦炭、碳纤维、球状碳、热分解气相碳质物、树脂煅烧体等)、硫属化合物(例如二硫化钛、二硫化钼、硒化铌等)、轻金属(例如铝、铝合金、镁合金、锂、锂合金等)、锂钛氧化物(例如尖晶石型的钛酸锂)等。
隔膜没有特别限定,例如可以使用微多孔性的膜、织布、无纺布、它们中相同材料或不同材料的叠层物等。作为形成隔膜的材料,可以列举出聚乙烯、聚丙烯、乙烯-丙烯共聚物、乙烯-丁烯共聚物、纤维素等。
非水电解液通过使电解质(例如锂盐)溶解于非水溶剂中来制备。非水溶剂例如可以列举出碳酸亚乙酯(EC)、碳酸亚丙酯(PC)、碳酸亚丁酯(BC)、碳酸二甲酯(DMC)、碳酸二乙酯(DEC)、碳酸乙甲酯(EMC)、γ-丁内酯(γ-BL)、环丁砜、乙腈、1,2-二甲氧基乙烷、1,3-二甲氧基丙烷、二甲醚、四氢呋喃(THF)、2-甲基四氢呋喃等。非水溶剂可以单独使用,也可以将两种以上混合使用。电解质例如可以列举出高氯酸锂(LiClO4)、六氟磷酸锂(LiPF6)、四氟硼酸锂(LiBF4)、六氟砷酸锂(LiAsF6)、三氟甲烷磺酸锂(LiCF3SO3)等锂盐。电解质可以单独使用,也可以将两种以上混合使用。电解质相对于非水溶剂的溶解量优选为0.2mol/L~3mol/L。若电解质的浓度过低,则有时无法得到充分的离子导电性。而若过高,则有时无法完全溶解于溶剂中。
容器和封口板的材料例如可以使用铝、铝合金、铁(Fe)、镀了镍(Ni)的铁、不锈钢(SUS)等。在由铝或铝合金形成正负极端子9、11的情况下,正负极引线8、10可以使用铝或铝合金。
作为用于电极防护罩的树脂,只要是难以被电解液侵蚀的树脂就可以使用任何树脂,例如可以使用聚乙烯、聚丙烯、乙烯-乙酸乙烯酯共聚物、乙烯-乙酸乙烯醇共聚物、乙烯-丙烯酸共聚物、乙烯-丙烯酸乙酯共聚物、乙烯-丙烯酸甲酯共聚物、乙烯-甲基丙烯酰基丙烯酸酯共聚物、乙烯-甲基丙烯酸甲酯共聚物、离聚物、聚丙烯腈、聚偏氯乙烯、聚四氟乙烯、聚三氟氯乙烯、聚苯醚、聚对苯二甲酸乙二醇酯、聚四氟乙烯等,上述树脂可以单独使用一种,而且也可以将两种以上混合使用。其中,优选使用聚丙烯或聚乙烯。
以上进行了说明的实施方式的电池的制造方法在包括充电的工序后包括使外装构件内的气体从排气孔放出并密封排气孔的工序。因此,即使在外装构件内存在干燥工序中未被完全除去的水分而在首次充电、其以后的充电或者老化中产生气体,也能够减小使用中的电池膨胀。为了减少包括充电的工序中的气体产生量,需要尽可能地减少电极群中的水分量。因此,需要提高干燥工序中的温度,或者延长干燥时间,但若提高干燥温度或长时间进行干燥,则电极因热而劣化的可能性提高。根据实施方式,即使电极群中的水分量多而包括充电的工序中的气体产生量多,也能够使其在气体放出工序中放出,因此能够减少使用中的电池膨胀。由此,不需要在苛刻的条件下干燥电极群,所以能够防止电极的热劣化,得到长寿命。
对本发明的几个实施方式进行了说明,但这些实施方式是作为例子所列举的,并不意味着对发明的范围进行限定。这些新实施方式也可以用其他各种方式来实施,可以在不超出发明主旨的范围内进行各种省略、置换、变更。这些实施方式以及其变形均包含在发明的范围和主旨中,并且包含在权利要求书所述的发明及其等同的范围内。
符号说明
1外装构件、2电极群、3容器、4封口板、5正极、5a正极集电极耳、5b含正极活性物质层、6负极、6a负极集电极耳、6b含负极活性物质层、7隔膜、9正极端子、11负极端子、12电极防护罩、13绝缘胶带、14第1密封盖、15薄壁部、16绝缘板、17绝缘垫圈、18波纹管、19工作销、21第2密封盖。
Claims (4)
1.一种电池的制造方法,其特征在于,其包括下述工序:
通过在所述外装构件上开口形成的注液口向包含电极的外装构件内注入电解液的工序;
密封所述注液口的第1密封工序;
至少包括充电的工序;
在所述外装构件上开口形成排气孔而使所述外装构件内的气体从所述排气孔放出的工序;和
密封所述排气孔的第2密封工序。
2.如权利要求1所述的电池的制造方法,其特征在于,所述外装构件具有板厚薄的薄壁部,通过断裂构件使所述薄壁部断裂,从而在所述外装构件上开口形成所述排气孔。
3.如权利要求2所述的电池的制造方法,其特征在于,以负压气氛进行所述排气孔的开口形成。
4.如权利要求2所述的电池的制造方法,其特征在于,所述断裂构件具有针状的前端部。
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US20140373342A1 (en) | 2014-12-25 |
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WO2013136445A1 (ja) | 2013-09-19 |
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