CN113286773A - 绝热片的制造方法 - Google Patents
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Abstract
准备在内部具有空间且具有彼此相反侧的第1面和第2面的纤维片。使包含水玻璃和碳酸亚乙酯的硅溶胶溶液浸渗于纤维片的空间中。在纤维片的第1面和第2面带有50℃以上的温度差的状态下,使硅溶胶溶液凝胶化而形成硅胶。使硅胶疏水化。由此得到绝热片。如上那样得到的绝热片能够使相对于规定的压力的压缩率在第1面和第2面不同。在将该绝热片配置于2个电池单元间的情况下,即使一个电池单元膨胀,也能够防止对另一个电池单元造成影响。
Description
技术领域
本发明涉及作为绝热对策使用的绝热片的制造方法。
背景技术
近年来,节能化的要求不断增加,但作为其实现方法,有通过设备的保温来提高能量效率的方法。另外,在将多个电池单元组合而成的二次电池等中,为了在一个电池单元成为高温的情况下不会对相邻的电池单元造成影响,还存在希望对电池单元之间进行绝热的要求。作为这些对策,有时在电池单元之间使用绝热效果优异的绝热片。
例如在专利文献1中公开了这样的绝热片。
现有技术文献
专利文献
专利文献1:日本特开2011-136859号公报
发明内容
准备在内部具有空间且具有彼此相反侧的第1面和第2面的纤维片。使包含水玻璃和碳酸亚乙酯的硅溶胶溶液浸渗于纤维片的空间中。在纤维片的第1面与第2面带有50℃以上的温度差的状态下,使硅溶胶溶液凝胶化而形成硅胶。使硅胶疏水化。由此得到绝热片。
如上那样得到的绝热片能够使相对于规定的压力的压缩率在第1面和第2面不同。在将该绝热片配置在2个电池单元之间的情况下,即使一个电池单元膨胀,也能够防止对另一个电池单元造成影响。
附图说明
图1是实施方式中的绝热片的截面图。
图2是表示实施方式中的绝热片的制造方法的截面图。
图3是使用了实施方式中的绝热片的二次电池的截面图。
具体实施方式
图1是实施方式中的绝热片101的截面图。绝热片101具备在内部具有空间21q的纤维片21和浸渗于纤维片21的空间21q中的硅胶31。
以下,对绝热片101的制造方法进行说明。图2是表示绝热片101的制造方法的截面图。首先,准备在内部具有空间21q的纤维片21。纤维片21具有约1mm的厚度,具有大小约为80mm×150mm的矩形形状。纤维片21由纤维21p形成,该纤维21p由平均纤维粗度约为2μn的玻璃纤维形成。纤维21p以形成空间21q的方式相互缠绕。在实施方式中,纤维片21的每1mm厚度的单位面积重量约为130g/m2。纤维片21具有彼此相反侧的面111、211。
接下来,进行用于使作为二氧化硅干凝胶的硅胶31浸渗于纤维片21的内部的空间21q中的准备。作为硅胶31的材料,在约20%的水玻璃中添加约6%的碳酸亚乙酯作为催化剂,制备硅溶胶溶液41。通过将纤维片21浸渍于硅溶胶溶液41中而使硅溶胶溶液41浸渗于纤维片21的空间21q中,从而得到材料片201。
接下来,对浸渗有硅溶胶溶液41的材料片201进行压制而使厚度均匀。厚度的调整方法可以使用辊压等方法。为了在将调整了厚度的材料片201夹于膜202的状态下进行养护而强化凝胶骨架,将硅溶胶溶液41凝胶化而形成作为二氧化硅干凝胶的硅胶31。通过该养护,材料片201在保持一定温度的状态下被放置,在纤维片21的空间21q内保持有硅溶胶溶液41的状态下,硅溶胶溶液41被凝胶化,进而凝胶生长。另外,通过用膜夹持材料片201,能够防止硅溶胶溶液41蒸发。在凝胶化时,使纤维片21的面111朝向垂直方向的上方,使面211朝向垂直方向的下方即朝向重力的方向,并且将面111保持为约90℃、将面211保持为约20℃的同时将材料片201放置约10分钟。由于在水玻璃原料中添加有碳酸亚乙酯作为催化剂,因此如果温度超过85℃,则水解反应急剧进行,二氧化硅的一部分溶出的同时进行硅溶胶溶液41的凝胶化。因此,在硅溶胶溶液41的高温的部分,与低温的部分相比,硅胶的含量减少,硅胶31相对于所施加的压力的压缩率变大。相反,在硅溶胶溶液41的温度低的部分,与温度高的部分相比,进行脱水缩合,硅溶胶溶液41直接被凝胶化,硅胶31的压缩率变低。
接着,通过以下的方法将硅胶31疏水化。将浸渗有硅胶31的纤维片21在6N的盐酸中浸渍约30分钟,使硅胶31与盐酸反应。之后,使浸渗有硅胶31的纤维片21浸渍于包含甲硅烷基化剂与醇的混合溶液的甲硅烷基化液之后,在约55℃的恒温槽中保存约2小时。此时,甲硅烷基化剂与醇的混合溶液渗透至硅胶31中。如果反应进行而开始形成三甲基硅氧烷键,则盐酸水从含有硅胶31的纤维片21向外部排出。甲硅烷基化处理结束之后,在约150℃的恒温槽中将硅胶31干燥约2小时,得到绝热片101。
为了在纤维片21即材料片201的面111、211使温度互不相同,例如,使面211朝向下方即重力的方向,将浸渗有硅溶胶溶液41的材料片201的面211配置在保持为低温的冷却板上,使保持为高温的加热板与面111抵接并维持规定时间。或者,也可以对面111照射红外线而对面111进行加热。
如上所述,通过在面111和面211带有50℃以上的温度差的状态下将硅溶胶溶液41凝胶化而强化凝胶骨架,能够使压缩率在面111附近与面211附近明显不同。
另外,优选使面111朝向垂直方向的上侧,使面111的温度高于面211的温度来养护材料片201。通过使面111的温度高于面211,从而与面211相比,在面111附近水解反应进一步进行,二氧化硅的一部分溶出,因重力而朝向面211移动。因此,能够在绝热片101的面111附近和面211附近使压缩率更明显地相互不同。
另外,优选在凝胶化时将面111的温度设为85℃以上且135℃以下。如果面111的温度低于85℃,则水解反应难以进行,如果超过135℃,则反应速度过高,偏差容易变大。
在如上得到的绝热片101中,维持为高温的面111附近的部分具有高压缩率,维持为低温的面211附近的部分具有低压缩率。
图3是实施方式中的二次电池301的截面图。二次电池301具备多个电池单元302和设置于多个电池单元302之间的2个绝热片101。2个绝热片101以面211相互对置的方式配置在电池单元302之间。绝热片101的面111分别与电池单元302相对。由于绝热片101的面111具有高压缩率,所以在一个电池单元302发热而膨胀的情况下,在绝热片101的具有高压缩率的面111附近的区域吸收膨胀,在具有低压缩率的面211附近的区域保持绝热性,因此能够防止对相邻的另一个电池单元302带来的热的影响而防止热失控。需要说明的是,在实施方式中的二次电池301中,2个绝热片101配置于电池单元302之间,但也可以代替2个绝热片101而配置以面211相互对置的方式折弯的1个绝热片101。
在二次电池的寿命末期,电池单元的中央部分因在电池单元内部产生的气体等而膨胀。将二氧化硅干凝胶以均匀的密度担载于纤维片的以往的绝热片如果过于硬,则无法充分吸收电池单元的膨胀。相反,如果该绝热片过于柔软,则由于被压缩而导致绝热性劣化,在一个电池单元成为高温的情况下,有可能对相邻的电池单元造成影响。
与此相对,通过将实施方式中的绝热片101用于二次电池301,在一个电池单元302发热而膨胀的情况下,能够防止对相邻的另一个电池单元302带来的热的影响而防止热失控。
附图标记说明
21:纤维片
31:硅胶
41:硅溶胶溶液
101:绝热片。
Claims (3)
1.一种绝热片的制造方法,包括以下步骤:
准备在内部具有空间且具有彼此相反侧的第1面和第2面的纤维片的步骤;
使包含水玻璃和碳酸亚乙酯的硅溶胶溶液浸渗于所述纤维片的所述空间中的步骤;
在所述纤维片的所述第1面和所述第2面带有50℃以上的温度差的状态下,使所述浸渗的硅溶胶溶液凝胶化而形成硅胶的步骤;以及
使所述硅胶疏水化的步骤。
2.根据权利要求1所述的绝热片的制造方法,其中,形成所述硅胶的所述步骤包括:在使所述第2面朝向重力的方向且使所述第1面的温度高于所述第2面的温度的状态下,使所述浸渗的硅溶胶溶液凝胶化而形成所述硅胶的步骤。
3.根据权利要求2所述的绝热片的制造方法,其中,形成所述硅胶的所述步骤包括:在使所述第2面朝向重力的方向且使所述第1面的温度高于所述第2面的温度、并且使所述第1面的温度为85℃以上且135℃以下的状态下,使所述浸渗的硅溶胶溶液凝胶化而形成所述硅胶的步骤。
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JP2019050576 | 2019-03-19 | ||
JP2019-050576 | 2019-03-19 | ||
PCT/JP2019/039947 WO2020188867A1 (ja) | 2019-03-19 | 2019-10-10 | 断熱シートの製造方法 |
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- 2019-10-10 JP JP2021506141A patent/JP7369914B2/ja active Active
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JPWO2020188867A1 (zh) | 2020-09-24 |
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