CN103201890B - 用于制造电池单元的方法和使用该方法制造的电池单元 - Google Patents
用于制造电池单元的方法和使用该方法制造的电池单元 Download PDFInfo
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Abstract
本发明提供了一种用于制造电池单元的方法,该方法是用于制造具有嵌入在由包括树脂层和金属层的层压片制成的电池壳体内部的电极组件和电解质的电池单元的方法,所述方法包括以下步骤:(a)在将电极组件安装在电池壳体上的同时,通过热熔来密封除了电池壳体的外周表面中的一个的端部之外的区域;(b)经由未密封的所述端部注入电解质,通过热熔来密封所述端部;(c)通过充电和放电来激活电池单元;(d)在端部的内部的未密封部分上冲出与电池壳体的内部连通的通孔;和(e)通过在未密封部分处在相反的方向上拉开电池壳体的上表面和下表面来施加真空并且移除激活期间产生的气体以及过量电解质。
Description
技术领域
本发明涉及一种制作电池单元的方法,更具体地涉及一种制造包括设置在由具有树脂层和金属层的层压片组成的电池壳体中的电极组件和电解质的电池单元的方法,该方法包括:(a)在电极组件被安装在电池壳体中的同时,热熔和密封电池壳体除了一端部部分之外的外周;(b)通过未密封的端部部分引入电解质,然后通过热熔来密封该端部部分;(c)对电池单元充电和放电,以激活该电池单元;(d)刺穿端部部分内部的未密封部分,以形成与电池壳体的内部连通的通孔;和(e)在施加真空压力的同时,在未密封部分处在彼此相反的方向上拉动电池壳体的顶面和底面,因此移除激活期间产生的气体以及过量电解质。
背景技术
随着移动装置的技术发展和其需求的增大,对作为电源的电池的需求也增大。因此,已经进行了对满足许多要求的电池的广泛研究。
作为电池形态方面的代表性实例,非常需要有角的二次电池和袋型二次电池,其具有相对小的厚度并因此可应用于诸如移动电话(也称为蜂窝电话)的物品。在其原材料方面,广泛需要锂二次电池,即锂离子电池、锂离子聚合物电池等,其具有诸如高能量密度、放电电压和/或输出稳定性的优点。
作为替换方式,可根据电极组件的阴极/隔板/阳极结构对二次电池分类,作为代表性实例,二次电池包括:凝胶卷(卷绕型)电极组件,其具有将隔板介于阴极和阳极之间的同时卷绕阴极和阳极的构造;堆叠(层压型)电极组件,其中在隔板介于阴极和阳极之间的同时,被切割为预定单元尺寸的多个阴极和阳极依次堆叠;堆叠/折叠电极组件,其具有在隔板介于具有预定单元尺寸的阴极和阳极之间的同时卷绕二分电池或全电池的构造,等。
近年来,具有在铝层压片中安装堆叠型或堆叠/折叠电极组件的构造的袋型电池吸引了相当多的注意力,这是因为其制造成本低、重量轻并且形状易于变化等,并且因此其用途逐渐增加。
图1是示意性示出常规的典型袋型电池的大致结构的分解透视图。
参考图1,袋型电池10可以具有:电极组件30;从电极组件30延伸的电极接头40和50;被焊接至电极接头40和50的电极引线60和70;以及容纳电极组件30的电池壳体20。
电极组件30是一种电力产生装置,其中在隔板介于阴极和阳极之间的同时,该阴极和阳极被依次堆叠,并且电极组件30可具有堆叠型或堆叠/折叠型结构。电极接头40和50可从电极组件30的每个极片延伸,而例如可通过焊接,将电极引线60、70分别电连接至从极片延伸的多个电极接头40、50。电极引线60、70中的每个可具有附接至每个顶面或底面的一部分的绝缘膜80,以便提高对电池壳体20的密封同时确保其电绝缘性。
电池壳体20可提供容纳电极组件30的空间,并且可能在形态方面为袋型。对于图1中所示的层压型电极组件30,为了将阴极接头40和阳极接头50与电极引线60、70组合,将电池壳体20的内顶端与电极组件30间隔开。
由于包括上述袋型电池的二次电池在制造电池单元的过程中大多经历通过充电-放电进行的电池激活,所以应移除激活期间产生的气体,以便制造最终电池单元,可将该操作称为“脱气”操作。
然而,制造上述袋型电池的常规过程伴随的一些问题在于:在其中切割密封端部和对气体脱气的脱气操作中,移除气体需要相当长的时间,继而增加生产成本;以及不完全消除气体和过量电解质,继而在通过热熔进行的密封操作中导致相当多的故障。
因此,仍存在对解决上述常规问题的技术的高需求。
发明内容
技术问题
因此,本发明涉及解决上述常规问题和克服现有技术中的技术限制。
更具体地,本发明的目的是提供一种制造具有提高的质量和生产率的电池单元的方法,该方法包括:在通过充电-放电激活电池单元后,刺穿在端部内部的未密封部分,以形成与电池壳体的内部连通的通孔;和在对电池壳体施加真空压力的同时,在未密封部分处拉动电池壳体的顶面和底面以打开电池壳体,从而完全移除过量电解质以及激活期间产生的气体。
本发明的另一目的是提供一种通过简单过程制造同时确保上述生产率和质量的电池单元。
技术解决方案
为了实现上述目的,根据本发明的一种用于制造包括设置在由包括树脂层和金属层的层压片制成的电池壳体中的电极组件和电解质的电池单元的方法可包括:(a)将电极组件安装在电池壳体中,并且通过热熔来密封电池壳体的除了外周侧中一个端部部分之外的其他部分;(b)通过未密封的端部部分引入电解质,并且通过热熔来密封该端部;(c)进行充电-放电;(d)刺穿在端部部分内部的未密封部分,以形成和电池壳体的内部连通的通孔;和(e)在施加真空压力的同时,在未密封部分处彼此相反地拉动电池壳体的顶面和底面以打开该电池壳体,从而移除过量电解质以及激活期间产生的气体。
因此,根据本发明的制造电池单元的方法包括:刺穿在端部部分内部的未密封部分,以形成和电池壳体的内部连通的通孔的操作;和在施加真空压力的同时,在彼此相反的方向上拉动电池壳体的顶面和底面,以打开电池壳体,从而与制造电池单元的任何常规方法相比,容易并快速移除过量电解质以及激活期间产生的气体的操作。
由于在真空下完全移除气体和过量电解质,所以可通过密封部分经热熔的高粘接能力提高电池单元的质量,即电池单元的安全性和寿命特征。
作为参考,例如,一种锂二次电池可包括:阴极活性材料,其包括锂过渡金属氧化物,诸如LiCoO2;以及阳极活性材料,其包括碳材料,并且可通过如下方式制作电池,即在阳极和阴极之间介入聚烯烃基多孔隔板并且在阳极、阴极之间引入含有锂盐的非水电解质诸如LiPF6。当对电池充电时,阴极活性材料中的锂离子放电,进入阳极中的碳层。另一方面,在放电期间,阳极碳层中的锂离子放电,进入阴极活性材料。在这点上,非水电解质可用作用于使锂离子在阳极和阴极之间移动的介质。该锂二次电池必须首先在电池的工作电压范围内稳定,并且具有以足够高的速度传送离子的性能。
然而,在连续充电和放电期间,电解质在阳极活性材料的表面上分解,由此产生气体,而在早期充电和放电时在阳极活性材料的表面上形成SEI膜,以抑制进一步产生气体。因此,需要用于激活电池单元的操作以形成SEI膜,并且有必要在完成电池单元的最终阶段之前执行该操作。
根据本发明的层压片可具有包括外部树脂层、用于屏蔽空气和水分的金属层和可热熔的内部树脂层的层结构。
外部树脂层必须具有对外部环境的良好耐受性,因此需要期望的抗张强度和防风雨性。在该方面,用于外部涂层的聚合物树脂可包括具有良好抗张强度和防风雨性的聚邻苯二甲酸酯(PEN)、聚对苯二甲酸乙二酯(PET)或弹力尼龙。
外部涂层可包含聚邻苯二甲酸酯(PEN)和/或可设有在其外部面的聚对苯二甲酸乙二酯(PET)层。
与聚对苯二甲酸乙二酯(PET)相比,聚邻苯二甲酸酯(PEN)表现出优良的抗张强度和防风雨性,同时具有小厚度,因此优选作为外部涂层使用。
内部树脂层的聚合物树脂可能为如下树脂,其具有热熔性(热粘合性)和低电解质吸收性以抑制其渗透,并且经受电解质导致的最小膨胀或腐蚀。更优选地,聚合物树脂可包括非拉伸(通常称为“注塑”)聚丙烯膜(CPP)。
根据优选实施例,本发明的层压片可具有如下结构,其包括:具有5至40μm厚度的外部涂层;具有20至150μm厚度的阻障层;和具有10至50μm厚度的内部密封剂层。如果层压片中的这些层每一层都太薄,就难以提高材料的屏蔽功能和层压片的强度。相反,如果该层太厚,其加工可能变得较难,同时增加片的厚度,因而不优选。
只要电极组件具有连接多个电极接头以构造阴极和阳极的结构,就不特别限制电极组件。优选地,可使用卷绕型、堆叠型和/或堆叠/折叠型结构。例如,已经在公开文献中,例如在韩国专利公开No.2001-0082058、2001-0082059和2001-0082060中详细描述了具有上述堆叠/折叠型结构的电极组件,其公开内容在此通过引用以其整体并入。
该电池壳体可具有不同形状,并且优选在平面图中为矩形。在该情况下,其端部部分可为边缘部。
在该结构中,上述边缘的宽度可能比其他边缘的宽度大20-300%,并且在通过热熔进行的激活期间,可密封上述边缘的端部。
例如,如果上述边缘的宽度小于每个其他边缘宽度的20%,就不能在上述边缘的空间中捕捉期望的空气量。另一方面,当上述边缘的宽度超过每个其他边缘宽度的300%时,可能增大边缘范围,继而增加生产成本。因此,在经济性方面不优选上述情况。
根据优选实施例,在通过吸气装置朝彼此、即在相反方向上拉动电池壳体的顶面和底面的同时,施加真空压力,以通过由于真空压力而具有增加的吸力的吸气装置容易地排出在电池单元内部产生的气体。
更具体地,在吸气装置在真空下吸附电池壳体的顶面和底面,然后打开顶面和底面之间的空间以确保输出路径(“排空”)后,可通过真空抽吸排出气体和电解质。
例如,吸气装置可包括:第一吸气垫,其与电池壳体的顶面接触;和第二吸气垫,其与电池壳体的底面接触。
在该结构中,第一吸气垫和第二吸气垫中的每个都可具有如下结构,其包括:粘附部分,其与电池壳体的外侧接触;和中空部分,其与粘附部分连接,该中空部分与在电池壳体的未密封部分形成的通孔连通并施加真空压力。
本发明也可包括用于加速电池单元的激活的装置,以快速捕捉在未密封部分中的气体。
例如,该加速可包括加热电池单元,以便在操作(c)至(e)中的至少一项操作期间提高电解质的温度,因而提高流动性。
换句话说,向电池单元施加热能可在降低电解质粘性的同时激活气体的运动,因此加速气体和电解质的顺利输出。
如果将上述向电池单元施加热包括在操作(c)中,则热可影响电池单元的充电-放电。因此,优选向操作(d)和(e)中的任一项操作添加向电池单元施加热。
在该构造中,例如,施加热的温度范围可为约40至80℃。如果温度低于40℃,就不能通过期望的充电-放电执行电池单元的激活。当温度超过80℃时,电池单元的激活为过度活化(超活化),并且可导致电池单元爆炸的问题,因而不优选。
根据另一实施例,可将向电池单元施加超声波振动包括在操作(c)至(e)中的至少一项操作中。
然而,在其中将向电池单元施加超声波振动包括在用于激活电池单元的操作(c)中的情况下,可影响电池单元的充电-放电。因此,优选将向电池单元施加超声波振动包括在操作(d)和(e)中的任一项操作中。
在该构造中,超声波的频率范围可以为约15kHz至100kHz。
同时,根据本发明的制造电池单元的方法还可包括在上述操作(e)之后通过热熔来密封未密封部分的内部并且切除其他(外部)部分。
同样地,本发明可提供一种通过上述方法制造的电池单元。
该电池单元可以是锂二次电池。锂二次电池可包括阴极、阳极、隔板和含有锂的非水电解质。
例如,可通过下列方式制作阴极:在诸如NMP的溶剂中混合阴极混合物,以制备浆料;然后将该浆料施加至阴极集电器,然后是干燥和卷起该阴极集电器。
除了阴极活性材料之外,阴极混合物还可任选地包括导电材料、粘合剂、填料等。
阴极活性材料可为能够经受电化学反应的材料,并且包括:锂过渡金属氧化物,例如其包含两种或更多种过渡金属;层状化合物,诸如锂钴氧化物(LiCoO2)、锂镍氧化物(LiNiO2)等,其被一种或更多种过渡金属取代;锂锰氧化物,其被一种或更多种过渡金属取代;锂镍氧化物,其由LiNi1-yMyO2(其中M=Co、Mn、Al、Cu、Fe、Mg、B、Cr、Zn或Ga,氧化物含有这些元素中的至少一种,y满足:0.01≤y≤0.7)表示;锂镍钴锰复合氧化物,其由Li1+zNibMncCo1-(b+c+d)MdO(2-e)Ae(其中:-0.5≤z≤0.5,0.1≤b≤0.8,0.1≤c≤0.8,0≤d≤0.2,0≤e≤0.2,b+c+d<1,M=Al、Mg、Cr、Ti、Si或Y,并且A=F、P或Cl)表示,诸如Li1+zNi1/3Co1/3Mn1/3O2、Li1+zNi0.4Mn0.4Co0.2O2;烯烃基锂金属磷酸盐,其由Li1+xM1-yM’yPO4-zXz(其中M为过渡金属,优选Fe、Mn、Co或Ni,M’=Al、Mg或Ti,X=F、S或N,并且-0.5≤x≤+0.5,0≤y≤0.5,0≤z≤0.1)表示,等,不特别限于此。
通常以相对包括阴极活性材料的混合液总重量的1-30wt.%的量添加导电材料。只要导电材料具有导电性而不导致电池化学改性,就不特别限制该导电材料。例如,导电材料可包括:石墨,诸如天然石墨或人造石墨;碳黑,诸如碳黑、乙炔黑、科琴黑、槽黑、炉黑、灯黑、夏黑等;导电纤维,诸如碳纤维或金属纤维;金属粉末,诸如氟化碳粉末、铝粉或镍粉;导电晶须,诸如氧化锌或钛酸钾等;导电金属氧化物,诸如氧化钛;导电物质,诸如聚苯衍生物等。
上述粘合剂协助活性材料和导电材料的结合以及粘结至集电器,并且通常以相对于包含阴极活性材料的混合物总重量的1至30wt.%的量添加粘合剂。该粘合剂的实例可包括:聚偏二氟乙烯、聚乙烯醇、羧甲基纤维素(CMC)、淀粉、羟丙基纤维素、再生纤维素、聚乙烯吡咯烷酮、四氟乙烯、聚乙烯、聚丙烯、三元乙丙橡胶(EPDM)、磺化EPDM、丁苯橡胶、氟化橡胶、各种共聚物等。
填料为抑制阴极膨胀的补充成分,只要填料包含不导致电池化学改性的多孔材料,就任选使用且不特别限制填料。例如,填料可包括:烯烃聚合物,诸如聚乙烯、聚丙烯等;多孔材料,诸如玻璃纤维或碳纤维等等。
通常,上述阴极集电器被制作成具有在3至500μm的范围内的厚度。只要阴极集电器具有导电性而不导致电池化学改性,就不特别限制该阴极集电器。例如,可使用下列材料制成阴极集电器:不锈钢、铝、镍、钛、煅烧碳或者经碳、镍、钛或银表面处理的铝或不锈钢等。集电器可被处理为在其表面上具有精细不规则性,以便提高对电极活性材料的粘附。另外,集电器可具有各种形式,包括膜、片、箔、网、多孔结构、泡沫、无纺布等。
例如,可通过下列方式制作本文使用的阳极,即向阳极集电器施加含有阳极活性材料的阳极混合物,然后干燥涂有涂层的集电器,并且阳极混合物可任选地包括上述部件,也就是说导电材料、粘合剂、填料等。
阳极活性材料的实例可包括:碳和石墨材料,诸如天然石墨、人造石墨、膨胀石墨、碳纤维、非石墨化碳(通常称为“硬碳”)、碳黑、碳纳米管、富勒烯、活性碳等;可与锂形成合金的金属,诸如Al、Si、Sn、Ag、Bi、Mg、Zn、In、Ge、Pb、Pd、Pt、Ti等,以及含有这些金属的化合物;碳和石墨材料与金属及其化合物的组合;含氮化物的锂等。在这些材料中,优选使用碳活性材料、硅活性材料、锡活性材料或硅-碳活性材料,并且可单独或者以这些材料中的两种或更多种的组合的方式使用这些材料。
通常,阳极集电器被制作成具有在3至500μm的范围内的厚度。只要阳极集电器具有高导电性而不导致电池化学改性,就不特别限制该阳极集电器。例如,可使用下列材料制成阳极集电器,即铜、不锈钢、铝、镍、钛煅烧碳、铜或者经碳、镍、钛或银表面处理的不锈钢、铝镉合金等。与阴极集电器类似,阳极集电器可被处理为在其表面上具有精细不规则性,以便提高对电极活性材料的粘附。另外,阳极集电器可具有各种形式,包括膜、片、箔、网、多孔结构、泡沫、无纺布等。
本文使用的隔板介于阴极和阳极之间,并且可使用具有高离子渗透性和良好机械强度的薄绝缘膜形成隔板。该隔板通常具有0.01至10μm的孔径和5至300μm的厚度。使用由具有耐化学性和疏水性的烯烃聚合物,诸如聚丙烯和/或玻璃纤维或聚乙烯制成的片或无纺布作为隔板。当使用包含聚合物的固态电解质作为电解质时,该固态电解质也可用作隔板。
本文使用的含有锂盐的非水电解质包括锂盐和非水电解质。该非水电解质可能为非水有机溶剂、有机固态电解质、无机固态电解质等。
非水有机溶剂可能为非质子有机溶剂,例如包括:N-甲基-2-吡咯烷酮、碳酸丙二酯、碳酸乙烯酯、碳酸丁二醇酯、碳酸二甲酯、碳酸二乙酯、γ-丁内酯、1,2-二甲氧基乙烷、四氢呋喃、2-甲基四氢呋喃、二甲亚砜、1,3-二恶茂烷、甲酰胺、二甲基甲酰胺、二恶茂烷、乙腈、硝基甲烷、甲酸甲酯、乙酸甲酯、磷酸三酯、三甲氧基甲烷、二恶茂烷衍生物、环丁砜、甲基环丁砜、1,3-二甲基-2-咪唑烷酮、碳酸丙二酯衍生物、四氢呋喃衍生物、乙醚、丙酸甲酯、丙酸乙酯等。
有机固态电解质的实例可包括: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(agitation)赖氨酸、聚脂硫化物、聚乙烯醇、聚偏二氟乙烯和含离子离解组的聚合物等。
无机固态电解质的实例可包括Li的氮化物、卤化物和/或硫酸盐,诸如Li3N、LiI、Li5NI2、Li3N-LiI-LiOH、LiSiO4、LiSiO4-LiI-LiOH、Li2SiS3、Li4SiO4、Li4SiO4-LiI-LiOH、Li3PO4-Li2S-SiS2等。
本文使用的锂盐是易于溶解在非水电解质中的材料,并且例如可包括: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、四苯硼锂、酰亚胺等。
另外,为了提高充电-放电特性和阻燃性,例如,可将吡啶、亚磷酸三乙酯、三乙醇胺、环醚、乙二胺、n-乙二醇二甲醚、六磷酸三酰胺、硝基苯衍生物、硫磺、醌亚胺染料、N-代恶唑烷酮、N,N-代咪唑烷、乙二醇二烯基醚、铵盐、吡咯、2-甲氧基乙醇、三氯化铝等添加至非水电解质。视需要,为了提高不可燃性,非水电解质还可包括含卤素溶剂,诸如四氯化碳和三氟乙烯。此外,为了提高高温贮存性,非水电解质可另外包括二氧化碳气体。
根据本发明制作的二次电池可用于小型装置的电源的电池单元,也可被用作包括多个电池单元的电池组的单元电池,其中该电池组被用作需要高热性、长周期性、高速性等的任何中等和/或大尺寸装置的电源。
本文所述的中等和/或大尺寸装置的优选实例可包括:通过来自电池马达的电力运行的电动工具;电动汽车,包括例如电动车辆(EV)、混合动力车辆(HEV)、插电式混合动力车辆(PHEV)等;电动双轮车辆,包括例如电动自行车、电动踏板车等;电动高尔夫车等,不特别限于此。
本发明也可提供一种设备,其用于移除过量电解质和在制造电池单元的方法中的激活操作中产生的气体的过程。
更具体地,本发明的设备可具有一种结构,其包括:
保持器,其用于安装电池单元,使得具有在电池壳体上形成的通孔的该电池壳体的一端在一个方向上凸出;
挤压块,其从顶侧挤压安装在保持器上的电池单元;
一对密封块,其被设置在保持器的外侧,以通过热熔来密封电池壳体的端部部分;和
一对吸气垫,在施加真空压力的同时,所述一对吸气垫在具有在电池壳体上形成的通孔的该电池壳体的端部,朝着彼此(即在相反方向上)拉动电池壳体的顶面和底面,以打开电池壳体,因此移除过量电解质和激活操作中产生的气体。
因此,由于上述设备包括一对吸气垫,在施加真空压力的同时,所述一对吸气垫在其中形成通孔的电池壳体的端部,在彼此相反的方向上拉动电池壳体的顶面和底面以打开电池壳体,所以可快速并且完全移除过量电解质和激活操作中产生的气体。
本发明的设备可使用挤压块有利地挤压电池单元,因而加速气体和过量电解质的排出。
根据优选实施例,保持器可具有其中配备的加热器,以加热电池单元。
因此,加热器向电池单元施加热,以提高气体的动能,同时,吸气垫可在真空下吸气,因此上述设备可相当大地减少气体移除所需的时间。
根据另一优选实施例,保持器可具有其中配备的超音波振动器,以向电池单元施加超声波振动。
因此,超声波振动器向电池单元施加超声波振动,以提高气体的动能,同时,吸气垫在真空下吸气。因此,本发明的设备相当大地减少气体移除所需的时间。
附图说明
结合附图,通过下文的详细说明,将更清楚地理解本发明的上述和其他目的、特征和其他优点,其中:
图1是示出常规袋型电池的典型结构的分解透视图;
图2至图7每幅都是按顺序示出根据本发明的示例性实施例制造电池单元的方法的示意图;
图8至图10每幅都是示出根据本发明的另一示例性实施例的气体移除设备的横截面图;并且
图11是示出图8中所示的吸气垫的放大示意图。
具体实施方式
下文中,将参考以下实例更详细地描述本发明的示例性实施例。然而,本领域技术人员应明白,仅出于例示性目的提出这些实施例,这些实施例不限制本发明的范围。
图2至图7是示出根据本发明的示例性实施例制造电池单元的方法的示意图。
参考这些图,下面将详细描述制造电池单元的方法。
首先,如图2中所示,在将电极组件110安装在电池壳体130的容纳部分120上之后,将电池壳体130对半折叠。
然后,如图3中所示,随着将电极组件110安装在电池壳体130的容纳部分120上,通过热熔来密封电池壳体130的除了其一个端部部分150之外的外周。
更具体地,将电极端子112、114所连接的电极组件110配备在电池壳体130中,该电池壳体由层压片组成同时具有在一侧的容纳部分120。同样地,在四侧中,通过热压缩使密封部分140形成在包括其中设置电极端子112、114的顶侧的三侧上,而另一侧150保持未密封。通过该未密封部分150引入电解质,然后如图4中所示,作为未密封部分150的边缘侧的端部162经历热熔,然后通过充电-放电激活电池单元100。
在未密封部分150处收集和捕捉过量电解质和该激活操作中产生的气体。
然后,如图5中所示,在刺穿所述端部部分的内部的未密封部分150以形成和电池壳体130的内部连通的通孔163之后,在施加真空压力的同时,在未密封部分150处在彼此相反的方向上拉动电池壳体130的顶面和底面以将该电池壳体打开,因而使得能够移除激活操作中产生的气体和过量电解质。
最后,如图6和图7中所示,在通过热熔来密封未密封部分的邻近电极组件110的内侧164后,切除其他外部部分,以完成电池单元100。
另外,参考图3,电池壳体130可具有在平面图中的矩形结构,其中边缘侧150的宽度“W”比每个其他边缘侧的宽度“w”大200%。
图8至图10示出根据本发明的另一实施例的气体移除设备的示意性横截面图。
首先,参考图8和图5,在移除过量电解质和在激活电池单元的操作中产生的气体的过程中使用气体移除设备200,该气体移除设备200包括:保持器210;一对密封块220;吸气装置230;以及与吸气装置230连接的真空吸气管232。
保持器210可设有电池单元100,使得具有在其中形成的通孔163的电池壳体130的端部部分150在一个方向上凸出,在保持器210的外侧设置密封块220,以便通过热熔来密封电池壳体130的端部部分150。
在施加真空压力的同时,吸气装置230可在具有在其中形成的通孔163的电池壳体130的端部部分150处,在相反的方向上拉动和打开电池壳体的顶面和底面,从而移除过量电解质和激活操作中产生的气体。
除了气体移除装置200a具有位于电池单元100的顶部以向下压电池单元100的顶部的挤压块240,和加热器250被配备在保持器210内部以加热电池单元100并且增加气体的动能之外,图9中所示的气体移除设备200a基本与图8中所示的气体移除设备200相同。因此,将省略其详细说明。然而,当然也可将挤压块240包括在图8中所示的设备200和图10中的设备200b中。
除了在保持器210内部配备用于向电池单元100施加超声波振动以增加气体动能的超声波振动器260之外,图10中的气体移除设备200b基本与图8中所示的移除设备200相同。因此,将省略其详细说明。
图11是示出吸气装置230的放大示意图,该吸气装置230包括与电池壳体130的顶面接触的第一吸气垫230a和与电池壳体130的底面接触的第二吸气垫230b。
在这点上,第一吸气垫230a和第二吸气垫230b中的每个都可具有与电池壳体130的外侧接触的粘附部分234和中空部分236的构造,该中空部分236与粘附部分234连接,并且在施加真空的同时与在电池壳体130的未密封部分150处形成的通孔163连通。
虽然在上文中已经结合附图描述了本发明的优选实施例,但是本领域技术人员应明白,在不偏离本发明的范围和精神的情况下,基于上述说明的各种变型和变化是可能的。
工业实用性
通过上文显而易见的是,根据本发明的用于制造电池单元的方法包括:进行充电-放电,以激活电池单元;刺穿电池壳体端部内部的未密封部分,以形成和电池壳体的内部连通的通孔;以及在施加真空压力的同时在未密封部分处在相反方向上拉动和打开电池壳体的顶面和底面。因此,可快速和完全移除过量电解质以及在激活操作中产生的气体。
Claims (10)
1.一种用于制造电池单元的方法,所述电池单元包括设置在由具有树脂层和金属层的层压片组成的电池壳体中的电极组件和电解质,所述方法包括:
(a)在所述电极组件被安装在所述电池壳体中的同时,热熔和密封所述电池壳体的除了所述电池壳体的一个端部部分之外的外周;
(b)通过未密封的端部部分引入所述电解质,然后通过热熔来密封所述端部部分;
(c)对所述电池单元进行充电和放电,以激活所述电池单元;
(d)刺穿所述端部部分的内部的未密封部分,以形成与所述电池壳体的内部连通的通孔;和
(e)在施加真空压力的同时,在所述未密封部分处在彼此相反的方向上拉动所述电池壳体的顶面和底面以打开所述电池壳体,从而移除过量的电解质以及在激活期间产生的气体,
其中,所述电池壳体具有在平面图中的矩形结构,并且所述端部部分是所述电池壳体的一个边缘侧,并且
在施加真空压力的同时,通过吸气装置在相反方向上拉动所述电池壳体的所述顶面和所述底面,其中:
所述吸气装置包括与所述电池壳体的所述顶面接触的第一吸气垫和与所述电池壳体的所述底面接触的第二吸气垫,并且
所述第一吸气垫和所述第二吸气垫中的每个吸气垫都具有如下结构,所述结构包括:粘附部分,所述粘附部分与所述电池壳体的外侧接触;和中空部分,所述中空部分与所述粘附部分连接,并且所述中空部分与在所述电池壳体的未密封部分处形成的通孔连通并施加真空压力。
2.根据权利要求1所述的方法,其中,所述层压片具有层压结构,所述层压结构包括外部树脂层、用于屏蔽空气和水分的阻障金属层、以及可热熔的内部树脂层。
3.根据权利要求1所述的方法,其中,所述电极组件具有卷绕型、堆叠型或堆叠-折叠型结构。
4.根据权利要求1所述的方法,其中,所述边缘侧的宽度比每个其他边缘侧的宽度都大20%至300%,并且在热熔期间为了激活而密封所述边缘侧的端部。
5.根据权利要求1所述的方法,其中,在操作(c)至(e)中的至少一项操作中加热所述电池单元。
6.根据权利要求1所述的方法,其中,在操作(c)至(e)中的至少一项操作中对所述电池单元施加超声波振动。
7.根据权利要求1所述的方法,还包括如下操作:在操作(e)之后,通过热熔来密封所述未密封部分的内侧并且然后切除其他外部部分。
8.一种在根据权利要求1所述的方法中移除过量电解质和在激活操作中产生的气体的设备,所述设备包括:
保持器,所述保持器用于安装所述电池单元,使得所述电池壳体的形成有通孔的一端在一个方向上凸出;
挤压块,所述挤压块用于挤压安装在所述保持器上的所述电池单元的顶部;
一对密封块,所述密封块被设置在所述保持器的外侧,以通过热熔来密封所述电池壳体的所述端部部分;和
一对吸气垫,在施加真空压力的同时,所述吸气垫在所述电池壳体的形成有所述通孔的端部处,在彼此相反方向上拉动所述电池壳体的顶面和底面以打开所述电池壳体,从而移除过量电解质和在所述激活操作中产生的气体。
9.根据权利要求8所述的设备,其中,在所述保持器中配备有加热器,以加热所述电池单元。
10.根据权利要求8所述的设备,其中,所述保持器具有超声波振动器,以向所述电池单元施加超声波振动。
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