CN111725451A - 盒体及其制造方法、层叠体的插入方法以及电池堆 - Google Patents
盒体及其制造方法、层叠体的插入方法以及电池堆 Download PDFInfo
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Abstract
本发明提供了具备与所收容的层叠体的膨胀收缩相对应的伸缩性的盒体及其制造方法、将层叠体插入该盒体中的层叠体的插入方法、以及使用该盒体的电池堆。该盒体是收容层叠体的盒体,具有与所述层叠体接触并相对的两个接触部、以及连接所述两个接触部的两个弹簧结构。
Description
技术领域
本发明涉及壳体及其制造方法、层叠体的插入方法以及电池堆。
背景技术
作为在构成全固态电池的层叠体的层叠方向施加约束压力的约束构件,日本特开2018-14286号公报公开了一种约束构件,其具有:夹持层叠体的两个表面的板状部;连结两个板状部的棒状部;以及与棒状部连结、通过螺纹结构等而调整约束压力的调整部。
日本特开2018-107003号公报公开了将全固态电池层叠体密封收容在外部的罐中的方法。日本特开2018-107003号公报中的方法为,将全固态电池层叠体收纳在外部的罐本体中之后,焊接构成外部的罐的上表面部分的盖部,从而密封收容全固态电池层叠体。
此外,作为改善施加在电池单元上的约束载荷在平面内的均匀性的方法,日本特开2017-212120号公报公开了一种电池,其具有多个电池单元以及配置在各个电池单元之间的衬垫,所述衬垫具有与电池盒接触的低弹簧常数凸部和高弹簧常数凸部。
已知全固态电池会随着使用状况及环境而膨胀收缩。日本特开2018-14286号公报中的约束构件和日本特开2018-107003号公报中的外部罐的形状基本上不发生变化。因此,在全固态电池膨胀的情况下,有可能产生过高的约束压力。由于过高的约束压力会给全固态电池以及约束构件两者都施加负载,因此有可能使至少一个发生劣化,使电池性能降低。此外,在全固态电池收缩的情况下,有可能无法施加充分的约束压力。
发明内容
本发明就是为了解决上述问题而作出的,提供一种具备与所收容的层叠体的膨胀收缩相对应的伸缩性的盒体及其制造方法、将层叠体插入该盒体的层叠体的插入方法、以及使用该盒体的电池堆。
本实施方式涉及的盒体是收容层叠体的盒体,其具有:
与所述层叠体接触并相对的两个接触部;以及
连接所述两个接触部的两个弹簧结构。
根据该结构的盒体,弹簧结构与施加在接触部的力相应而发生变形。例如,当收容的层叠体膨胀时,弹簧结构伸长,从而抑制了施加在层叠体上的压力变得过高。另一方面,当所收容的层叠体收缩时,弹簧结构收缩并维持层叠体与接触部的接触,从而抑制了施加在层叠体上的压力的降低。
上述盒体也可以由纤维增强塑料制造。通过使用纤维增强塑料制造,可以获得更高强度的盒体。
本实施方式涉及的盒体的制造方法具有将浸渍过树脂的碳纤维向模具缠绕的工序以及固化树脂的工序。
根据该盒体的制造方法,能够利用纤维增强塑料制造高强度的盒体。
在上述盒体的制造方法中,所述浸渍过树脂的碳纤维可以为片状。通过使用片状的碳纤维,能够缩短制造时间。
根据上述盒体的制造方法,在所述向模具缠绕的工序中,可以将所述碳纤维以追随模具的形状的方式进行按压的同时缠绕。根据该制造方法,即使在盒体的弹簧结构具有凹部的情况下,也能够容易地制造。
上述盒体的制造方法在所述向模具缠绕的工序之后,还可以具有将所述模具作为芯模并使用外部模具进行压制的工序。根据该制造方法,即使在盒体的弹簧结构具有凹部的情况下,也能够容易地制造。
此外,本实施方式涉及的盒体的制造方法可以具有将含有碳纤维的树脂组合物注塑成型的工序。
本实施方式涉及的层叠体的插入方法是将层叠体插入所述本实施方式的盒体的方法,其中,准备所述盒体以及层叠体,在推压扩展所述盒体的所述弹簧结构的状态下,插入层叠体。通过以该方法插入层叠体,即使在层叠体从初始状态收缩的情况下,也能够维持从盒体向层叠体的按压。
此外,本实施方式涉及的层叠体的插入方法是将层叠体插入所述本实施方式的盒体的方法,其中,准备所述盒体以及层叠体,在所述层叠体沿层叠方向被压缩的状态下,插入到所述盒体中。通过以该方法插入层叠体,即使在层叠体从初始状态收缩的情况下,也能够维持从盒体向层叠体的按压。
本实施方式涉及的电池堆具有:
盒体,其具有相对的两个接触部和连接所述两个接触部的两个弹簧结构;以及
层叠体,其层叠有两个以上的全固态燃料电池单元,
所述层叠体插入所述盒体内,所述层叠体的层叠方向的两端分别与所述两个接触部接触,
所述两个接触部向所述层叠体的层叠方向按压。
根据该结构的电池堆,由于在层叠体中的各个电池单元膨胀收缩的情况下,盒体的弹簧结构会发生伸缩,因此缓和了从盒体向层叠体施加的压力的变化。其结果,将施加在层叠体上的压力维持在适当的范围内。
在上述电池堆中,所述全固态燃料电池单元可以是负极含有硅的硫化物电池单元。根据本实施方式的电池堆,即使是充电时的膨胀系数较大的、负极含有硅的硫化物电池单元,也能够与膨胀收缩相对应地对层叠体施加适当的压力。
根据本发明,能够提供具备与所收容的层叠体的膨胀收缩相对应的伸缩性的盒体及其制造方法、将层叠体插入该盒体中的层叠体的插入方法、以及使用该盒体的电池堆。
通过参照作为并非用于限制本公开的例子而附加的附图,并阅读以下详细说明,能够进一步明确本公开的其他的特征、目的、优点。
附图说明
图1是示出本实施方式涉及的盒体的一个例子的立体图。
图2是示出本实施方式涉及的电池堆的一个例子的立体图。
图3是图2的主视图。
图4是用于说明层叠体膨胀时盒体的变化的主视图。
图5是示出盒体的变形例的主视图。
图6是示出盒体的另一变形例的主视图。
图7是用于说明层叠体的第一种插入方法的主视图。
图8是用于说明层叠体的第二种插入方法的主视图。
具体实施方式
以下,通过发明的实施方式来说明本发明,但权利要求要求保护的范围所涉及的发明不限于以下实施方式。此外,为了使说明明确,以下的记载及附图被适当地简化。
另外,在本发明中,“固化”包括树脂与树脂之间、树脂与交联剂之间经过化学反应而固化的情况、以及树脂不经过化学反应而通过冷却至玻璃化转变温度以下而固化的情况。
首先,对本实施方式的盒体结构进行说明。图1是示意性示出本实施方式的盒体的立体图。另外,在以下说明中,为了使说明明确,使用三维(XYZ)坐标系来进行说明。另外,各个轴方向的比例尺有时彼此不同。
图1所示的盒体10是收容层叠体的盒体,其具有:两个接触部11,在收容层叠体之后,其分别与该层叠体的层叠方向的两端接触;以及两个弹簧结构12,其连接该两个接触部11。两个接触部11配置在彼此相对的位置,两个弹簧结构12配置为彼此相对。该两个接触部11以及两个弹簧结构12整体构成筒状的盒体10。层叠体20配置在筒内(参照图2)。
盒体10的材质可以从能够达到所需强度的材质中选择使用任何材质。由于在后述电池堆等情况下,在施加了较高约束压力的状态下,层叠体反复膨胀收缩,因此要求盒体具有能够承受这种反复膨胀收缩的强度。在该情况下,作为盒体的材质,优选使用金属或纤维增强塑料(CFRP)。此外,从强度的角度出发,优选盒体10的接触部11和弹簧结构12一体成型。另外,制造方法将在后面进行描述。
图2是示出本实施方式涉及的电池堆的一个例子的立体图。此外,图3是图2的主视图。两个接触部11与层叠体20的层叠方向的端部接触。该接触部11由于弹簧结构12的回复力向层叠体20的层叠方向按压。
在本实施方式中,弹簧结构12是根据该弹簧结构12的长度方向(X轴方向)的力而伸缩并产生回复力的结构。在例如为金属或CFRP的情况下,由于材料本身的延伸率小,因此通过形状来实现弹簧结构12。作为弹簧结构12的形状的具体例子,可以是图1的例子所示的弯曲形状,也可以是图5的例子所示的弯折形状,还可以是图6的例子所示的波浪(凹凸)形状。
层叠体20由两个以上的平板状构件层叠而成。平板状构件可以是任何构件。在本实施方式中,由于盒体具备与层叠体的膨胀收缩相对应的伸缩性,因此作为平板状构件,可以适当地使用根据使用环境而膨胀收缩的全固态电池单元21。在本实施方式中,可以适当地应用膨胀系数较高的、负极含有硅的硫化物电池单元。
层叠体20可以是由全固态电池单元21形成的层叠体,也可以是在全固态电池单元21的层叠体的层叠方向的两端还具有端板22的层叠体。作为端板22的材质,可以举出金属和CFRP等,优选在与盒体10接触的接触面的边缘实施倒角加工(R加工)。通过配置该端板,抑制负载集中于盒体10的局部。
在这里,将接触部11之间的距离(以下有时称为长轴)设为a。图1中的a0是盒体10上未施加力时(以下,有时称为初始状态)的接触部11之间的距离。
此外,将层叠体的层叠方向的厚度(以下,有时简称为厚度)设为b。图3中的bm是在层叠体20收缩至最低限的状态下的层叠体20的厚度。
层叠体20收容时的盒体10的长轴a与层叠体20的厚度b一致。如图3所示,优选本实施方式的盒体10在层叠体的厚度为最小値bm时仍然按压层叠体。从该角度来看,优选接触部11之间的初始状态的距离a0比层叠体的厚度的最小値bm小。
本实施方式的盒体10可以考虑预收容的层叠体的厚度bm来设计。
图4是用于说明层叠体膨胀时盒体的变化的主视图。如图4所示,收容在盒体10内的层叠体20有时由于使用环境而膨胀。在如日本特开2018-14286号公报以及日本特开2018-107003号公报所示的约束构件基本不变形的情况下,层叠体20很难向层叠方向膨胀,有时会产生过高的约束压力。
与此相对,本实施方式的盒体10所收容的层叠体20如果膨胀,则弹簧结构12被推压扩展,盒体10的长轴a伸长至膨胀后的层叠体的厚度b。其结果,缓和了压力变化,抑制了被施加过高的压力的情况。
接下来,对将层叠体20插入本实施方式的盒体10的两个方法进行说明。根据下述插入方法,能够将满足(盒体10的初始状态的长轴a0)<(层叠体20的最小厚度bm)的关系的层叠体插入盒体。
参照图7来说明第一种插入方法。图7是用于说明层叠体的第一种插入方法的主视图。图7中的b0表示初始状态的层叠体的厚度。第一种插入方法为:推压扩展盒体10的弹簧结构12,在使盒体10的长轴a为b0以上的状态下,插入层叠体20。根据该方法,能够容易地插入层叠体20。在弹簧结构为图1和图5所示的凸型形状的情况下,特别适合使用本插入方法。另一方面,在图6的例子所示的凹凸形状的情况下,有时无法充分推压扩展。在该情况下,可以采用下述第二种插入方法。
参照图8来说明第二种插入方法。图8是用于说明层叠体的第二种插入方法的主视图。第二种插入方法为:在使用压缩机构23将层叠体20压缩至厚度a0以下的状态下,将层叠体20插入盒体10。插入后移除压缩机构23,完成插入。根据该方法,即使盒体是难以推压扩展的形状,也能够插入层叠体20。
进一步地,可以将上述第一种插入方法和第二种插入方法进行组合。即,通过推压扩展盒体10且压缩层叠体20,以(层叠体的厚度b)<(盒体的长轴a)的状态插入层叠体。根据该方法,无需对层叠体侧施加过量的负载就能够将层叠体插入盒体。
接下来,对本实施方式的盒体的合适的制造方法进行说明。首先,对纤维增强塑料制的盒体的制造方法进行说明,然后对金属制的盒体的制造方法进行说明。
第一种制造方法具有将浸渍过树脂的碳纤维向模具缠绕的工序以及固化树脂的工序。
使碳纤维浸渍的树脂可以是热固性树脂,也可以是热塑性树脂。热固性树脂的情况下,通常与交联剂(热固化剂)组合使用。
在本制造方法中,准备盒体10用的模具(芯棒)。除此之外,将碳纤维浸渍在热固性树脂或者加热后流化的热塑性树脂中,从而使碳纤维浸渍过树脂。接着,一边旋转模具,一边通过纤维缠绕法(FW法)将碳纤维缠绕至规定厚度。然后,通过固化树脂而制造盒体10。根据该第一种制造方法,由于将较长的碳纤维进行缠绕,因此能够获得机械强度优异的盒体10。
第二种制造方法为:准备片状的碳纤维(预浸料)作为浸渍树脂的碳纤维,通过扁平缠绕法(SW法)将该片状的碳纤维缠绕在模具上后,使树脂固化。根据该方法,与所述第一种制造方法相比,提高了生产率。
在弹簧结构为图1、图5所示的凸形形状的情况下,特别适合使用上述第一种制造方法和上述第二种制造方法。另一方面,在图6的例子所示的凹凸形状的情况下,难以形成凹部13。
第三种制造方法为:在向所述模具缠绕的工序中,将所述碳纤维以追随模具的方式进行按压的同时缠绕。根据该方法,能够适当地制造弹簧结构为凹凸形状的盒体10。具体地,在上述FW法或SW法中,在模具与碳纤维接触的位置配置按压机构,通过将碳纤维向模具按压而使其追随模具。在本制造方法中,优选具备局部加热机构,以使碳纤维不从凹部脱落。在树脂为热塑性树脂的情况下,对与模具接触之前的碳纤维进行加热,使热塑性树脂流化。此外,在树脂为热固性树脂的情况下,在碳纤维与模具接触之后对其进行加热,使其固化。作为加热手段,例如可以使用激光或IR灯等。
第四种制造方法为:在通过FW法或SW法将碳纤维缠绕在模具上之后,将所述模具作为芯模,使用外部模具压制。在该方法的情况下,由于压制时碳纤维进入凹部,因此当将碳纤维向模具缠绕时,无需使碳纤维必须追随凹部。
根据该第三种或第四种制造方法,能够适当地制造出凹凸形状的盒体。
此外,作为第五种制造方法,举出对含有碳纤维的树脂组合物进行注塑成型的方法。由于碳纤维较短,因此与上述第一至第四种制造方法相比,虽然强度稍差,但是生产率优异。因此,可以根据盒体的用途而采用本制造方法。
此外,在制造金属制盒体的情况下,准备好具有规定尺寸的金属板之后,通过压制形成盒体的外形,然后将端部焊接形成筒状即可。
接下来,参照图2,对本实施方式涉及的电池堆进行说明。本实施方式涉及的电池堆100具有:盒体10,其具有相对的两个接触部11和连接所述两个接触部11的两个弹簧结构12;以及层叠体20,其层叠有两个以上全固态电池单元21,所述层叠体20插入所述盒体10内,所述层叠体20的层叠方向的两端分别与所述两个接触部11接触,所述两个接触部11在所述层叠体20的层叠方向上进行按压。
根据本实施方式的电池堆100,由于在层叠体20中的各个电池单元21膨胀收缩的情况下,盒体10的弹簧结构12伸缩,因此缓和了从盒体10向层叠体20施加的压力的变化。其结果,将施加在层叠体上的压力维持在适当的范围内(例如,0.8~40MPa左右)。在本实施方式中,可以适当地应用膨胀系数较高的、负极含有硅的硫化物电池单元。
根据以上的本公开的说明,明确了能够对本公开进行各种变形。这样的变形不应被视为脱离了本公开的思想及范围,此外,所有的对本领域技术人员而言显而易见的改良都包括在权利要求书的保护范围中。
Claims (11)
1.一种盒体,其收容层叠体,其具有:
与所述层叠体接触并相对的两个接触部;以及
连接所述两个接触部的两个弹簧结构。
2.根据权利要求1所述的盒体,其中,
所述盒体由纤维增强塑料制造。
3.一种盒体的制造方法,其制造权利要求2所述的盒体,其具有:
将浸渍过树脂的碳纤维向模具缠绕的工序;以及
固化树脂的工序。
4.根据权利要求3所述的盒体的制造方法,其中,
浸渍过所述树脂的碳纤维为片状。
5.根据权利要求3或4所述的盒体的制造方法,其中,
在所述向模具缠绕的工序中,
将所述碳纤维以追随模具的方式进行按压的同时缠绕。
6.根据权利要求3或4所述的盒体的制造方法,其中,
在所述向模具缠绕的工序之后,
具有将所述模具作为芯模并使用外部模具进行压制的工序。
7.一种盒体的制造方法,其制造权利要求2所述的盒体,其具有:
将含有碳纤维的树脂组合物注塑成型的工序。
8.一种层叠体的插入方法,其中,
准备权利要求1或2所述的盒体、以及层叠体,在推压扩展所述盒体的所述弹簧结构的状态下,插入层叠体。
9.一种层叠体的插入方法,其中,
准备权利要求1或2所述的盒体、以及层叠体,所述层叠体沿层叠方向被压缩的状态下,插入到所述盒体中。
10.一种电池堆,其具有:
盒体,其具有相对的两个接触部和连接所述两个接触部的两个弹簧结构;以及
层叠体,其层叠有两个以上的全固态电池单元,
所述层叠体插入所述盒体内,所述层叠体的层叠方向的两端分别与所述两个接触部接触,
所述两个接触部向所述层叠体的层叠方向按压。
11.根据权利要求10所述的电池堆,其中,
所述全固态电池单元是负极含有硅的硫化物电池单元。
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