CN102427909B - 电池的制造方法 - Google Patents
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Abstract
本发明的课题在于提供能够对表面上的激光反射率较大的构件实现均匀的焊接的激光焊接方法。激光焊接工序S1包含:粗糙化处理工序S11,其中通过第一激光加工装置对负极端子(20)(第一构件)与负极导线(21)(第二构件)的焊接区(30、30、30、30)的表面(各焊接部位(31))照射激光而实施粗加工,在该表面形成激光标记(32);和焊接工序S12,其中通过第二激光加工装置对通过粗糙化处理工序S11而表面粗糙化的各焊接部位(31)照射激光而将各焊接部位(31)熔融,将负极端子(20)与负极导线(21)激光焊接。
Description
技术领域
本发明涉及激光焊接方法以及包含该激光焊接方法的电池的制造方法,特别涉及对于铜构件等表面上的激光反射率较大的构件的激光焊接技术。
背景技术
以往,将两个金属构件通过激光焊接接合的技术在制造领域广泛使用。
特别,使用YAG激光的激光焊接在大气气氛下也能够使用,所以与在真空气氛下进行的电子束焊接(EBW)等其他的焊接技术相比,在设备成本方面、控制方面等非常有利,具有在大量生产工序中积极引入的倾向。
但是,在对于表面上的激光反射率较大的金属构件(铜构件等)的激光焊接中,激光在构件表面反射而不能给予充分的热量输入(线能量),在焊接部位不能得到预期的熔深,所以现状是不能满足地进行实用化。
另外,存在与铜构件相对的吸收率较高的绿色激光的激光加工装置。另一方面,使用一般流通的绿色激光的激光加工装置不但仅为输出较低的装置,而且应用范围仅限于与较薄构件相对的焊接、加工等,所以实用化不现实。
在制造锂离子二次电池等二次电池的工序中,考虑组装工序的效率,具有通过焊接将由铜构件构成的两个构件接合的部位(例如,负极导线与负极端子的接合部位)。
但是,如上所述,在使用一般的激光加工装置的情况下,由于来自铜构件的反射较大,另外由于输出较低,不能给予充分的热量输入,所以具有不能得到预期的熔深的课题。
作为解决该课题的方法之一,具有使用高输出的激光加工装置的方法。但是,容易引起产生溅射、煤烟等或者焊接部位贯通等不良,具有焊接性不稳定的另外的问题。
进而,在使用高输出的激光加工装置的情况下,向焊接部位以外的热量输入增大到必要以上,具有导致配置在焊接部位周围的其他的构件的热破损的危险。
另外,在专利文献1中,公开了使用砂纸、研磨剂、喷丸处理或者化学蚀刻事先将焊接面粗糙化、降低表面上的反射率的技术。
但是,在专利文献1所记载的粗糙化方法中,与大部分相对的粗糙化精度良好,但向具有台阶、凹凸面等形状变化的微小部位的均匀的粗糙化比较困难,容易在表面状态产生不均。另外,在上述的粗糙化方法中,需要粗加工时的掩模、加工后的清洗,具有工序变得复杂的问题,难以在大量生产工序中使用。
特别,在焊接时使用高输出激光的情况下,容易受到焊接部位的表面状态、产品状态(例如形状、组装精度)等的不均的影响,所以激光焊接时的热量输入变得不稳定,容易产生焊接缺陷。
如上所述,在以往的激光焊接方法中,难以对表面上的激光反射率较大的构件实现均匀的焊接。
专利文献1:特开2003-263977号公报
发明内容
发明所要解决的课题
本发明的课题在于提供能够对表面上的激光反射率较大的构件实现均匀的焊接的激光焊接方法以及包含该激光焊接方法的电池的制造方法。
用于解决课题的技术方案
作为本发明的第一技术方案的电池的制造方法,该方法制造包含铜制的外部端子和铜制的集电端子作为构成要素的电池,其中:包含通过激光焊接将所述外部端子与集电端子接合的激光焊接工序;在所述激光焊接工 序中,对所述外部端子与集电端子的焊接区的表面,通过波长为532nm的绿色激光器照射激光而实施粗加工,将该表面粗糙化;对所述表面粗糙化了的焊接区,通过波长为1064nm的YAG激光器照射激光而将所述焊接区熔融,将所述外部端子与集电端子激光焊接;并且,所述焊接区具有通过铆接铆钉而形成的铆钉部,在由所述YAG激光器进行的加工时,对形成于所述铆钉部的端部的角焊缝区,从外侧向内侧以30°~45°的角度进行激光照射。
发明的效果
根据本发明,能够对表面上的激光反射率较大的构件实现均匀的焊接。
附图说明
图1是表示电池的示意图。
图2是表示作为激光焊接的对象的电池的焊接区的剖面图。
图3是表示焊接区的俯视图。
图4是表示激光焊接工序的流程图。
图5是表示激光焊接工序的图。
图6是表示焊接区的放大图。
标号说明
10:电池
20:负极端子(第一构件)
21:负极导线(第二构件)
22:铆钉部
30:焊接区
31:焊接部位
32:激光标记
具体实施方式
下面,参照附图,对作为与本发明有关的激光焊接方法的一个实施方式的激光焊接工序S1进行说明。在激光焊接工序S1中,对构成电池10的负极的负极端子20与负极导线21进行激光焊接。
在下面,对作为激光焊接工序S1中的焊接对象的电池10的概略结构进行说明。
电池10是锂离子二次电池,如图1所示,在外壳11的内部收纳有发电元件12。外壳11具有由箱体构成的容器部13和将容器部13的开口面封闭的盖部14。盖部14具有两个开口14a、14a,从这些开口14a、14a使正极端子15、负极端子20分别向外侧突出。
负极端子20是铜制的外部端子,经由作为集电端子的负极导线21与发电元件电连接。
更详细地说,如图2以及图3所示,负极端子20与负极导线21,在将设置于负极导线21的顶端的铆钉部22经由密封构件23、绝缘构件24等铆接于盖部14的开口14a的状态下进行激光焊接,在负极端子20与负极导线21的连接部形成有四处焊接区30、30、30、30。
另外,从品质管理等观点设置四处焊接区30,但并不限定于此。
负极导线21是由与负极端子20相同的材料构成的铜制的集电端子,连接于发电元件12的负极侧。
铆钉部22是成形于负极导线21的端部的铆钉状的部位,其顶部具有比盖部14的开口14a的内径大的外径。如图2所示,在焊接区30,铆钉部22比负极端子20的顶部(最高的部位)向上方突出。
密封构件23是树脂制的构件,将负极导线21与盖部14密封,将外壳11内密闭。
绝缘构件24是树脂制的构件,将负极导线21与盖部14绝缘,防止从 负极导线21向盖部14的电传导。
如上所述,本实施方式的激光焊接工序S1将电池10中的铜制的负极端子20与铜制的负极导线21的铆钉部22激光焊接。
另外,如图2所示,在负极端子20与负极导线21的铆钉部22的焊接区30形成有凹凸形状,形成有台阶,不但焊接形状变得复杂,而且在对铆钉部22的顶端部进行铆接时会施加变形,所以其表面状态变得不均匀,所以从需要使激光焊接时的热量输入稳定的方面以及需要确保充分的熔深的方面等,在激光焊接时需要较高的精度。
进而,如上所述,在负极端子20与铆钉部22的焊接区30的附近,配置有耐热性比金属构件差的树脂制的构件,所以需要考虑在激光焊接时降低激光输出等对焊接区30的周围的各构件的热影响。
即,激光焊接工序S1提供满足上述那样的高精度的激光焊接以及对于热影响的考虑的要求的激光焊接方法。
下面,对激光焊接工序S1进行说明。
如图4以及图5所示,激光焊接工序S1包含(表面)粗糙化处理工序S11、焊接工序S12。
粗糙化处理工序S11是对在激光焊接后形成有焊接区30的部分的表面通过第一激光加工装置照射激光、将照射部位的表面粗糙化的工序。在粗糙化处理工序S11中,所述第一激光加工装置照射具有向表面的激光反射率较高的构件(铜构件等高反射率构件)的吸收率较好的波长的激光(例如绿色激光)。
焊接工序S12是对通过粗糙化处理工序S11粗糙化的成为焊接区30的部分的表面通过第二激光加工装置照射激光、将照射部位熔融而进行激光焊接的工序。所述第二激光加工装置是在一般的激光焊接中使用的装置,照射YAG激光。
粗糙化处理工序S11是对形成有各焊接区30的部分(在本实施方式中,如图5(a)所示,四处焊接部位31、31、31、31)的表面照射波长532nm的绿色激光,在照射部位设置激光标记32、32、32、32,将焊接部位31、 31、31、31粗糙化的工序。
焊接部位31是为了实现形成预期的焊接区30而设定的焊接部位,如图5所示,设定于负极导线21的铆钉部22外周的一部分以及与铆钉部22的外周接触的负极端子20的一部分。
另外,通过激光焊接工序S1设定的焊接部位31并不限定于与焊接区30相同的设定部位、大小等。即,焊接部位31只要能够实现预期的焊接区30的形成即可。
更详细地说,如图5(b)所示,在粗糙化处理工序S11中,向设定于形成为俯视圆形状的铆钉部22的外周部分以及负极端子20上的与所述铆钉部22的外周部分接触的部分的焊接部位31、31、31、31,通过所述第一激光加工装置照射绿色激光,设置俯视矩形状的激光标记32、32、32、32,向激光照射部分的表面施加均匀的粗加工。各激光标记32形成为具有微小的凹凸的槽形状,所述槽形状具有预定的深度(例如0.3~0.4μm左右的深度)。
这样,在设有激光标记32、32、32、32的部位,铜构件的表面的光泽消失,所以在激光焊接时,能够使用照射铜构件等表面上的反射率较大的YAG激光的第二激光加工装置。
即,如果对处于没有特别实施表面处理的状态的铜构件等高反射率构件照射YAG激光,则照射的激光的大部分通过构件表面反射从而向构件内的吸收率降低,所以难以实现良好的焊接,但通过在焊接部位31、31、31、31设置激光标记32、32、32、32而将表面的光泽除去,能够提高来自照射YAG激光的第二激光加工装置的激光的向焊接部位31、31、31、31处的构件内的吸收率,实现良好的焊接。
另外,所谓“高反射率构件”,指的是如果向没有实施表面处理的状态的表面照射YAG激光则照射的激光的大部分反射从而向构件内的吸收率降低,所以难以实现良好的焊接的构件。
另外,在粗糙化处理工序S11中使用的第一激光加工装置,通过适当的控制装置控制激光的照射部位、照射时间等,能够对预先设定的焊接部 位31、31、31、31形成具有预期的面积(例如,如图5(b)所示比焊接部位31大的区域)以及预期的深度的激光标记32、32、32、32。
这样,使用能够高精度控制的绿色激光在各焊接部位31设置激光标记32,所以能够容易地组装进电池10的制造工序等大量生产工序。
焊接工序S12是相对于通过粗糙化处理工序S11设有激光标记32的各焊接部位31照射波长1064nm的YAG激光,将负极端子20与负极导线21的铆钉部22的表面熔融,将负极端子20与负极导线21激光焊接,形成焊接区30、30、30、30的工序。
更详细地说,如图5(c)所示,在焊接工序S12中,对跨及铆钉部22以及负极端子20地设置的激光标记32、32、32、32,通过所述第二激光加工装置照射YAG激光,将焊接部位31、31、31、31熔融,将负极端子20与铆钉部22激光焊接。
如上所述,设有激光标记32的各焊接部位31失去铜构件特有的表面的光泽,并且通过形成于激光标记32的微小的凹凸形状,表面积增加。因此,在各焊接部位31,通过第二激光加工装置照射的YAG激光的吸收率提高。即,在通过铜构件构成的各焊接部位31,也能够加深激光热量输入时的熔深,能够确保充分的熔深与焊接面积。
此外,在各焊接部位31的表面,通过激光标记32均匀实施有粗加工,在表面状态没有不均,所以能够使向各焊接部位31的激光热量输入稳定。
如上所述根据激光焊接工序S1,能够对由表面上的激光反射率较大(特别,相对于第二激光加工装置的反射率较大)的铜构件构成的负极端子20、与同样由铜构件构成的负极导线21的铆钉部22的各焊接部位31实现均匀的焊接,能够防止气孔、裂纹等焊接缺陷。
此外,通过与上述同样的原因,能够提高相对于铆钉部22的铆接部分的制造不均(表面形状、铆接间隙等)以及表面状态的不均的可靠性。
进而,能够将在焊接工序S12中使用的第二激光加工装置的输出抑制得较低,所以能够抑制对焊接部位31的周围的构件的影响。
另外,在焊接工序S12中,照射YAG激光的第二激光加工装置作为 辅助气体喷雾氧气,在氧气气氛下进行激光焊接。
由此,在焊接时产生剧烈的氧化反应,能够通过发热反应促进熔深。
因此,能够提高焊接工序S12中的焊接性。
进而,在粗糙化处理工序S11中设置各激光标记32时,在激光标记32的表面以及该槽的内部,残留有微小的粉尘。
如上所述,通过在焊接工序S12中在氧气氛下实施激光焊接,残留于激光标记32的微粉尘燃烧(产生所谓的粉尘爆炸),将激光焊接时的燃烧活性化而促进焊接。因此,能够得到各焊接部位31上的良好的熔深以及充分的焊接面积。
如上所述,成为激光焊接工序S1的焊接对象的一侧的负极导线21的铆钉部22是由高反射率构件构成并且在铆接时对其顶端部施加变形的微小部位。因此,在以往的激光焊接方法中,如上所述构件表面上的反射较大,表面状态由于变形变得不稳定,进而不可能实现与作为微小部位而形成的焊接部位相对的焊接。
然而,通过激光焊接工序S1包含通过粗糙化处理工序S11将表面粗糙化的第一焊接工序与通过焊接工序S12对粗糙化了的表面进行焊接的第二焊接工序这两阶段的焊接工序,能够实现在以往的激光焊接方法中不能实现的焊接。另外,能够良好地应用于需要将如上所述那样形成的焊接部位焊接的、制造包含负极端子20以及负极导线21等结构元件的电池10的工序。
另外,如图6所示,在焊接工序S12中,优选:对焊接部位31上的作为薄壁部的、形成于铆钉部22的端部的角缝焊区25,从外侧向内侧以30~45°的角度照射激光。
由此,在激光焊接时,角缝焊区25有效地吸收激光,所以能够抑制激光输出,并且提高焊接稳定性。
另外,在粗糙化处理工序S11将激光标记32形成为俯视矩形状,将其形成面积设置得比焊接部位31的面积大,但并不限定于此。例如,也可以将激光标记32的形成面积设置得比焊接部位31小,在该情况下,也能够 在设有激光标记32的区域内充分地熔融焊接,对于其附近部位也能够通过热传导实现充分的热量输入。
另外,在本实施方式中,对于作为锂离子二次电池的电池10的负极侧的激光焊接进行了说明,但也能够使用于与同样表面上的激光反射率较高的构件相对的焊接。例如,在将利用于电子部件等中的铜线接合时能够应用激光焊接工序S1,在该情况下,能够作为钎焊接合的代替而使用。
产业上的利用可能性
本发明能够利用于向在表面具有形状变化的构件的激光焊接工序,特别适用于对构件表面上的激光的反射率较大的构件进行激光焊接的技术。
Claims (2)
1.一种电池的制造方法,该方法制造包含铜制的外部端子和铜制的集电端子作为构成要素的电池,其中:
包含通过激光焊接将所述外部端子与集电端子接合的激光焊接工序;
在所述激光焊接工序中,
对所述外部端子与集电端子的焊接区的表面,通过波长为532nm的绿色激光器照射激光而实施粗加工,将该表面粗糙化;
对所述表面粗糙化了的焊接区,通过波长为1064nm的YAG激光器照射激光而将所述焊接区熔融,将所述外部端子与集电端子激光焊接;并且,
所述焊接区具有通过铆接铆钉而形成的铆钉部,在由所述YAG激光器进行的加工时,对形成于所述铆钉部的端部的角焊缝区,从外侧向内侧以30°~45°的角度进行激光照射。
2.如权利要求1所述的电池的制造方法,其中:由所述YAG激光器进行的激光焊接在氧气气氛下进行。
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- 2009-05-15 CN CN200980159288.4A patent/CN102427909B/zh active Active
- 2009-05-15 KR KR1020117029881A patent/KR101250093B1/ko active IP Right Grant
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US20120055909A1 (en) | 2012-03-08 |
KR20120009510A (ko) | 2012-02-01 |
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