CN110998905A - 蓄电模块及蓄电元件 - Google Patents
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- CN110998905A CN110998905A CN201880051703.3A CN201880051703A CN110998905A CN 110998905 A CN110998905 A CN 110998905A CN 201880051703 A CN201880051703 A CN 201880051703A CN 110998905 A CN110998905 A CN 110998905A
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- power storage
- cellophane
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Abstract
本发明的一方案的蓄电模块具备:多个蓄电元件,它们分别具有外壳;玻璃纸片,其设置于所述蓄电元件之间且与所述外壳接触,并以玻璃纤维为主体;以及保持构件,其对多个所述蓄电元件以及所述玻璃纸片进行保持,所述玻璃纸片被压迫在所述蓄电元件之间。
Description
技术领域
本发明涉及蓄电模块及蓄电元件。
背景技术
在手机、机动车等各种各样的设备中使用了能够充放电的蓄电元件。电动机动车(EV)、插电式混合动力电动机动车(PHEV)等将电能作为动力源的车辆需要较大的能量,因此搭载有具备多个蓄电元件的大容量的蓄电模块。
在这样的蓄电模块中,在非通常的使用状态下由于某种原因而导致某一个蓄电元件的温度过度地上升的情况下,由于该蓄电元件的热量传导而使相邻的蓄电元件被加热。由此,当相邻的蓄电元件的电极的活性物质被加热到自身发热温度以上时,则有可能该相邻的蓄电元件也发热而进一步对其相邻的蓄电元件加热,从而多个蓄电元件连锁地发热。
在使用以树脂膜覆盖金属制的外壳的蓄电元件的情况下,在蓄电元件发热时,树脂膜熔融而使相邻的金属制的外壳彼此接触,从而易于产生发热的连锁。
在日本特开2015-195149号公报中,公开了抑制蓄电元件的热量向相邻的蓄电元件传导的技术。在该技术中,利用由云母集成材料形成的分隔构件来抑制蓄电元件间的热量的传导。
现有技术文献
专利文献
专利文献1:日本特开2015-195149号公报
发明内容
发明要解决的课题
从能量密度的观点出发,所述公报所记载的蓄电模块存在改善的余地。
本发明的课题在于提供能量密度大、且能够防止蓄电元件间的发热的连锁的蓄电模块及作为该蓄电模块的主要构成要素的蓄电元件。
用于解决课题的方案
以往的蓄电模块通过在多个蓄电元件之间设置10mm左右的空气层、数mm左右厚度的分隔构件(例如云母集成材料)来进行隔热。最近,期望蓄电元件以及蓄电模块的容量的进一步增大、以及能量密度(例如每单位体积的蓄电量)的进一步增大。
在各个蓄电元件中,若使容量以及能量密度增大,则在某个蓄电元件发热时从该蓄电元件释放的能量以及热量也大。若使蓄电元件间的空气层、分隔构件的厚度增加,则能够提高隔热性,但在这些方法中,作为蓄电模块的能量密度降低。因此,谋求能够防止发热的连锁而不使能量密度降低的新对策。
本发明的一方案的蓄电模块具备:多个蓄电元件,它们分别具有外壳;玻璃纸片,其设置于所述蓄电元件之间且与所述外壳接触,并以玻璃纤维为主体;以及保持构件,其对多个所述蓄电元件以及所述玻璃纸片进行保持,所述玻璃纸片被压迫在所述蓄电元件之间。
发明效果
本发明的一方案所涉及的蓄电模块具备所述玻璃纸片,由此能够防止发热的连锁。
附图说明
图1是示出本发明的一实施方式的蓄电元件的示意性的立体图。
图2是沿图1的蓄电元件的长侧面平行地剖切而得到的示意性的剖视图。
图3是沿图1的蓄电元件的短侧面平行地剖切而得到的示意性的剖视图。
图4是具备图1的蓄电元件的蓄电模块的示意图。
具体实施方式
本发明的一方案所涉及的蓄电模块具备:多个蓄电元件,它们分别具有外壳;玻璃纸片,其设置于所述蓄电元件之间且与所述外壳接触,并以玻璃纤维为主体;以及保持构件,其对所述多个蓄电元件以及所述玻璃纸片进行保持,所述玻璃纸片被压迫在所述蓄电元件之间。
本发明的一方案所涉及的蓄电模块具备以玻璃纤维为主体的玻璃纸片,因此在蓄电元件由于某种原因而发热的情况下,所述玻璃纸片发挥隔热效果。因此,能够抑制向相邻的蓄电元件的热传导从而防止发热的连锁。为抑制各个蓄电元件的外壳随着使用而发生膨胀,有时以压迫多个蓄电元件的状态组装蓄电模块。在这样的情况下,玻璃纸片也能够借助其规定的刚性,确保蓄电元件间的空隙,保持热传导抑制效果。
所述外壳具有短侧面、以及与所述短侧面正交且比所述短侧面面积大的长侧面,所述玻璃纸片优选为至少与所述长侧面接触。长侧面是指例如方形外壳(prismatic case)的壁面中的面积最大的壁面。由于所述玻璃纸片至少与所述长侧面接触,从而能够有效地抑制向相邻的蓄电元件的热传导。
所述玻璃纸片优选为在所述短侧面和所述长侧面的整体范围内覆盖所述外壳。由于所述玻璃纸片在所述短侧面和所述长侧面的整体范围内覆盖所述外壳,从而能够提高热传导抑制效果。
所述玻璃纸片的平均厚度优选为0.2mm以上且1.0mm以下。由于所述玻璃纸片的平均厚度在上述范围内,蓄电模块能够缩窄蓄电元件间的间隔而增大能量密度,并且能够得到充分的热传导抑制效果。
所述玻璃纸片的空隙率优选为70%以上且97%以下。由于所述玻璃纸片的空隙率在上述范围内,所述玻璃纸片能够确保充分的强度和隔热性。
在对所述蓄电元件施加20N/cm2的压力的状态下,所述玻璃纸片的空隙率优选为45%以上且80%以下。通常,在将蓄电元件组装于蓄电模块时,通过模块的端板等而向蓄电元件、夹在蓄电元件间的玻璃纸片施加压迫力。在施加20N/cm2的压力的状态下,通过使所述玻璃纸片的空隙率在上述范围内,能够确保所述玻璃纸片在组装于蓄电模块的状态下的充分的强度和隔热性。
优选的是,进一步具备与所述玻璃纸片接触的树脂膜。通过进一步具备与所述玻璃纸片接触的树脂膜,能够确保玻璃纸片的强度,并且能够使外壳间的绝缘可靠。
本发明的其他方案的蓄电元件具备外壳、以及与所述外壳接触的以玻璃纤维为主体的玻璃纸片,所述玻璃纸片的空隙率为70%以上且97%以下。
本发明的其他方案的蓄电元件在组装于蓄电模块时,能够通过玻璃纸片抑制对相邻的蓄电元件的热传导,从而防止发热的连锁。由于所述玻璃纸片的空隙率在上述范围内,从而能够确保充分的强度和隔热性。
以下,适当参照附图对本发明的实施方式进行详细说明。
在图1至图3中示出了本发明的一实施方式所涉及的蓄电元件1。蓄电元件1具备电极体2、收容该电极体2的外壳3、设置于该外壳3的外表面的以玻璃纤维为主体的玻璃纸片4、层叠于玻璃纸片4的外表面的树脂膜5。在外壳3中封入有电极体2和电解液。
所述外壳3也可以是长方体形状(prismatic shape),该长方体形状具有方形的底面、与该底面对置的方形的顶面、方形的一对短侧面、以及与所述一对短侧面正交且比所述短侧面面积大的方形的一对长侧面。所述玻璃纸片4优选为以覆盖所述一对长侧面的方式设置。所述玻璃纸片4也可以以覆盖一个短侧面和一个长侧面的方式设置,也可以以覆盖一对短侧面和一个长侧面的方式设置。所述玻璃纸片4更优选为在所述一对短侧面和所述一对长侧面的整体范围内设置于外壳3,换句话说,更优选为以覆盖外壳3的四个侧面整体的方式(以覆盖整周的方式)设置。
蓄电元件1为了将电极体2与外部电路电连接而具有一对外部端子(正外部端子6以及负外部端子7)。外部端子6、7以贯通外壳3的顶面的方式设置。
也可以在蓄电元件1的电极体2与外壳3之间适当配置绝缘膜、垫片、间隔件等构件。
蓄电元件1在收容电极体2的外壳3的外表面具备以玻璃纤维为主体的玻璃纸片4。因此,在将多个蓄电元件1并排配置而使用时,在非通常的使用状态下由于某种原因而导致发热的情况下,所述玻璃纸片4也发挥隔热效果,因此能够抑制向相邻的蓄电元件1的热传导。这样,能够防止发热的连锁。
玻璃纸片4在玻璃纤维之间包含空气,从而热传导率小,因此能够发挥较高的隔热效果,而不会使蓄电元件1的外形尺寸较大地增大。因此,能够提高蓄电元件1、以及包含多个蓄电元件1的蓄电模块(后述)的能量密度。
以下,对蓄电元件1的各构成要素进行详细叙述。
作为电极体2,可以使用卷绕型电极体,也可以使用如图示那样能够使能量密度更大的层叠型电极体。
层叠型电极体2具有层叠的方形板状的多个正极板8、负极板9、分隔件10、以及从正极板8和负极板9朝向外壳3的顶面延伸出的正极突片11和负极突片12。
更详细而言,电极体2具有多个正极板8以及负极板9隔着分隔件10交替地层叠而形成为大致长方体形状的主体、以及从该主体延伸的正极突片11和负极突片12。为了使蓄电元件1高容量化,层叠的正极板8的片数例如可以是40至60片。负极板9的片数也可以设为相同。
电极体2的正极突片11与正外部端子6电连接,负极突片12与负外部端子7电连接。具体而言,正极突片11与在外壳3的内侧从正外部端子6沿着外壳3的顶面而延伸的板状的正极集电构件13连接。负极突片12与在外壳3的内侧从负外部端子7沿着外壳3的顶面而延伸的板状的负极集电构件14连接。
正极板8具有:箔状至片状的正极基材,其具有导电性;以及正极活性物质层,其层叠于该正极基材的两面。
作为正极板8的正极基材的材质,使用铝、铜、铁、镍等金属或者它们的合金。在这些材质中,从导电性的高度与成本的平衡出发优选铝、铝合金、铜以及铜合金,更优选铝以及铝合金。作为正极基材的例子,可举出箔、蒸镀膜等,从成本方面出发优选箔。换句话说,作为正极基材,优选铝箔。作为铝或者铝合金,可以例示出JIS-H4000(2014)中规定的A1085P、A3003P等。
正极板8的正极活性物质层是由包含正极活性物质的所谓的复合材料形成的多孔性的层。形成正极活性物质层的复合材料根据需要而包含导电剂、粘结剂(粘合剂)、增粘剂、填料等任意成分。
作为所述正极活性物质,例如可举出以LixMOy(M表示至少一种过渡金属)表示的复合氧化物(LixCoO2、LixNiO2、LixMn2O4、LixMnO3、LixNiαCo(1-α)O2、LixNiαMnβCo(1-α-β)O2、LixNiαMn(2-α)O4等)、以LiwMex(XOy)z(Me表示至少一种过渡金属,X表示例如P、Si、B、V等)表示的聚阴离子化合物(LiFePO4、LiMnPO4、LiNiPO4、LiCoPO4、Li3V2(PO4)3、Li2MnSiO4、Li2CoPO4F等)。这些化合物中的元素或者聚阴离子也可以用其他元素或者阴离子种类来置换一部分。在正极活性物质层中,可以单独使用这些化合物的一种,也可以将两种以上混合而使用。正极活性物质的结晶结构优选为层状结构或者尖晶石结构。
负极板9具有:箔状至片状的负极基材,其具有导电性;以及多孔性的负极活性物质层,其层叠于该负极基材的两面。
作为负极板9的负极基材的材质,优选铜或者铜合金。作为负极基材的例子,优选为箔。换句话说,作为负极板9的负极基材优选铜箔。作为用作负极基材的铜箔,可例示出压延铜箔、电解铜箔等。
负极活性物质层是由包含负极活性物质的所谓的复合材料形成的多孔性的层。形成负极活性物质层的复合材料根据需要而包含导电剂、粘结剂(粘合剂)、增粘剂、填料等任意成分。
作为负极活性物质,适当使用能够吸纳以及释放锂离子的材质。作为具体的负极活性物质,例如可举出锂、锂合金等金属、金属氧化物、聚磷酸化合物、以及例如石墨、非晶质碳(易石墨化碳或者难石墨化性碳)等炭材料等。
在所述负极活性物质中,从将正极板8与负极板9的每单位对置面积的放电容量设为适当的范围的观点出发,优选使用Si、Si氧化物、Sn、Sn氧化物或者它们的组合,特别优选使用Si氧化物。Si和Sn在成为氧化物时,能够具有石墨的3倍左右的放电容量。
分隔件10由电解液浸润的片状至膜状的材料形成。作为形成分隔件10的材料,例如可以使用纺布、无纺布等,但典型地使用具有多孔性的片状至膜状的树脂。该分隔件10将正极板8与负极板9隔离,并且在正极板8与负极板9之间保持电解液。
作为分隔件10的主成分,例如可以采用聚乙烯(PE)、聚丙烯(PP)、乙烯-乙酸乙烯酯共聚物、乙烯-丙烯酸甲酯共聚物、乙烯-丙烯酸乙酯共聚物、氯化聚乙烯等聚烯烃衍生物、乙烯-丙烯共聚物等聚烯烃、聚对苯二甲酸乙二酯、共聚聚酯等聚酯等。其中,作为分隔件10的主成分,优选使用耐电解液性、耐久性以及熔敷性优异的聚乙烯以及聚丙烯。
分隔件10优选为在两面或者单面(优选为与正极板8对置的面)具有耐热层或者耐氧化层。耐热层是指防止分隔件10因热而破损,从而更可靠地防止正极板8与负极板9短路的层。另一方面,耐氧化层是指在高电压环境下保护分隔件但不会对分隔件赋予足够的耐热性的层。
分隔件10的耐热层或者耐氧化层可以是包含许多无机粒子和将该无机粒子间连接的粘合剂的结构。
作为无机粒子的主成分,例如可举出氧化铝、二氧化硅、氧化锆、二氧化钛、氧化镁、二氧化铈、氧化钇、氧化锌、氧化铁等氧化物、氮化硅、氮化钛、氮化硼等氮化物、碳化硅、碳酸钙、硫酸铝、氢氧化铝、钛酸钾、滑石、高岭土、高岭石、埃洛石、叶腊石、蒙脱石、绢云母、云母、镁绿泥石、膨润土、石棉、沸石、硅酸钙、硅酸镁等。其中,作为耐热层或者耐氧化层的无机粒子的主成分,特别优选氧化铝、二氧化硅以及二氧化钛。
正极突片11以及负极突片12可以通过使正极板8以及负极板9的正极基材以及负极基材以从层叠有活性物质层的方形状的区域分别呈带状地突出的方式延长而形成。
在层叠的方向上观察正极板8和负极板9时(参照图2),正极突片11和负极突片12从电极体2的主体的一边以彼此不重叠的方式突出。从各正极板8以及负极板9延伸的正极突片11以及负极突片12分别层叠并被捆束,且与正极集电构件13以及负极集电构件14连接。
正极突片11以及负极突片12也可以避开正极集电构件13以及负极集电构件14的与正外部端子6以及负外部端子7连接的连接结构,而与正极集电构件13以及负极集电构件14的与外壳3的顶面大致平行地延伸的部分连接。
通过使用与外壳3的顶面平行地延伸的板状的正极集电构件13以及负极集电构件14,容易增大与正极突片11以及负极突片12连接的连接面积,并能够减小正外部端子6以及负外部端子7与正极突片11以及负极突片12之间的电阻。
正极集电构件13以及负极集电构件14向正外部端子6以及负外部端子7的连接例如能够通过将贯通正极集电构件13以及负极集电构件14的正外部端子6以及负外部端子7的端部扩展铆接等而与正外部端子6以及负外部端子7向外壳3的顶面的固定一并进行。
正极突片11以及负极突片12相对于正极集电构件13以及负极集电构件14的连接例如可以通过超声波焊接、激光焊接、铆接等来进行。
正极集电构件13优选为由与正极基材同种类的金属形成,负极集电构件14优选为由与负极基材同种类的金属形成。
作为与电极体2一起封入外壳3的电解液,可以使用通常用于蓄电元件的公知的电解液,例如可以使用在含有碳酸乙烯酯(EC)、碳酸丙烯酯(PC)、碳酸丁烯酯(BC)等环状碳酸酯、或者碳酸二乙酯(DEC)、碳酸二甲酯(DMC)、碳酸甲乙酯(EMC)等链状碳酸酯的溶剂中溶解六氟磷酸锂(LiPF6)等而成的溶液。
外壳3将电极体2在浸渍于电解液的状态下保持,并且保护电极体2。
外壳3优选为具有形成底面、一对短侧面以及一对长侧面的有底筒状的外壳主体、以及形成外壳3的顶面并将外壳主体的开口密封的盖板的结构。这样,由有底筒状的外壳主体而将底面、一对短侧面以及一对长侧面一体地形成,由此能够提高外壳3的强度。将配设有外部端子6、7的顶面由与外壳主体分立的盖体来形成,由此能够使蓄电元件1的组装容易。
在外壳3的顶面,在正外部端子6以及负外部端子7之间设置有破裂阀(RuptureValve)15。在非通常的使用状态下,在外壳3的内压上升到一定的压力以上的情况下,该破裂阀15开放从而形成开口,使外壳3内的气体向外部释放而降低压力。
作为外壳3的材质,例如可以使用铝、铝合金、不锈钢等金属、以及树脂等。外壳的材质优选为金属。
对于外壳3的顶面(盖板)的厚度,取决于材质、大小,但例如也可以为0.5mm以上且2.0mm以下。相对于此,作为外壳3的底面的厚度,例如也可以为0.5mm以上且1.8mm以下。作为外壳3的一对短侧面以及一对长侧面的厚度,例如也可以为0.5mm以上且1.5mm以下。外壳3优选为使外壳3的底面以及顶面的厚度比一体地形成为四角筒状的一对短侧面以及一对长侧面的厚度大。更优选为使最后接合的顶面的厚度比能够与一对短侧面以及一对长侧面一体地形成的底面的厚度大。
玻璃纸片4是抄制玻璃纤维而成的片材,通过在玻璃纤维之间包含空气而使热传导率变得比较小。通过使该玻璃纸片4覆盖外壳3的外周,从外壳3经由玻璃纸片4而向与蓄电元件1相邻的物体(例如并列配置的蓄电元件1)传导的热量得到抑制。
抄制玻璃纤维而得到的玻璃纸片4能够弯折,因此能够以卷绕于外壳3的外周的方式来覆盖外壳3。因此,蓄电元件1的制造比较容易。
作为玻璃纸片4的平均厚度的下限,优选为0.2mm,更优选为0.3mm。另一方面,作为玻璃纸片4的平均厚度的上限,优选为1.0mm,更优选为0.8mm。通过将玻璃纸片4的平均厚度设为上述下限以上,玻璃纸片4具有充分的隔热性。通过将玻璃纸片4的平均厚度设为上述上限以下,能够减小蓄电元件1的玻璃纸片4的占有体积,提高能量密度。
作为玻璃纸片4的空隙率(常压时)的下限,优选为70%,更优选为80%。另一方面,作为玻璃纸片4的空隙率的上限,优选为97%,更优选为95%。虽然当增大玻璃纸片4的空隙率时隔热性提高,但是作为片材的拉伸强度降低而使制造性降低。另一方面,虽然当减小玻璃纸片4的空隙率时作为片材的拉伸强度提高,但是隔热性降低。通过设为上述下限以上,玻璃纸片4具有充分的隔热性和强度。通过将玻璃纸片4的空隙率设为上述上限以下,玻璃纸片4具有充分的强度。“空隙率”是如下计算出的值:使用由塞尺测定的厚度来计算玻璃纸片的每单位面积的体积,根据玻璃纤维的比重和玻璃纸片的每单位面积所使用的玻璃纤维的重量来计算玻璃纸片的每单位面积的玻璃纤维的体积,并计算出上述体积的差量相对于玻璃纸片的每单位面积的体积的比率。
作为在对蓄电元件1施加20N/cm2的压力的状态下的玻璃纸片4的空隙率的下限,优选为45%,更优选为50%。另一方面,作为在对蓄电元件1施加20N/cm2的压力的状态下的玻璃纸片4的空隙率的上限,优选为80%,更优选为75%。通常,在将蓄电元件1组装于蓄电模块时,相邻的蓄电元件1以彼此相互压迫的方式被施加例如20N/cm2左右的压力。因此,通过将在对蓄电元件1施加20N/cm2的压力的状态下的玻璃纸片4的空隙率设为上述下限以上,玻璃纸片4具有充分的隔热性。通过将在对蓄电元件1施加20N/cm2的压力的状态下的玻璃纸片4的空隙率设为上述上限以下,能够确保玻璃纸片4的强度。
作为形成玻璃纸片4的玻璃纤维的平均直径的下限,优选为0.2μm,更优选为0.3μm。另一方面,作为形成玻璃纸片4的玻璃纤维的平均直径的上限,优选为1.5μm,更优选为1.0μm。通过将形成玻璃纸片4的玻璃纤维的平均直径设为上述下限以上,能够使玻璃纸片4具有充分的强度。通过将形成玻璃纸片4的玻璃纤维的平均直径设为上述上限以下,能够使玻璃纸片4具有充分的隔热性。
玻璃纸片4可以包含粘合剂。作为玻璃纸片4所包含的粘合剂,可以使用例如丙烯酸、聚酯、聚丙烯、氟树脂等的高分子粘合剂、例如硅酸钠等的无机粘合剂等。
玻璃纸片4可以使用粘接剂而粘接于外壳3的外表面。以在粘接时以及蓄电元件1发热时不会浸入到玻璃纸片4的深部的方式来选择粘接剂的材质以及厚度。为了使玻璃纸片4向外壳3的粘接容易,也可以在玻璃纸片4的背面(与外壳3对置的面)使用内侧树脂膜层叠而成的多层片。作为该内侧树脂膜的材质,在内侧树脂膜充分薄的情况下,也可以是例如聚丙烯、聚苯硫醚等的在蓄电元件1的发热时熔融的材质。作为代替,通过将内侧树脂膜设为例如聚酰亚胺等具有充分的耐热性的材质,能够防止在蓄电元件1发热时树脂浸入玻璃纸片4而使热传导率增大的情况。
树脂膜5覆盖玻璃纸片4的表面,并防止在蓄电元件1中玻璃纸片4因刮蹭等而损伤,提高蓄电元件1的操作性。通过使用预先将树脂膜5与玻璃纸片4一体化而成的层叠片,能够在制造蓄电元件1时使玻璃纸片4的直到粘接于外壳3为止的操作容易。
作为树脂膜5的材质,例如可以举出聚丙烯、聚苯硫醚、聚对苯二甲酸乙二酯等。
作为树脂膜5的平均厚度的下限,优选为10μm,更优选为15μm。另一方面,作为树脂膜5的平均厚度的上限,优选为100μm,更优选为50μm。通过将树脂膜5的平均厚度设为上述下限以上,树脂膜5的强度变得充分从而确保对玻璃纸片4的保护。通过将树脂膜5的平均厚度设为上述上限以下,能够防止蓄电元件1不必要地增大。
正外部端子6以及负外部端子7具有配置于外壳3的顶面的外侧并供母线、配线连接的板状的端子部、以及从该端子部延伸并贯通外壳3的顶面的轴部。正外部端子6以及负外部端子7以不与外壳3电接触、且不使电解液漏出的方式隔着绝缘性的衬垫而气密地固定于外壳3。
在非通常预见的使用方式的特异的状况下,例如在由于外力而破损从而发生电极体2的内部短路,并且由于短路电流而在外壳3的内部产生气体时等,当外壳3的内压达到一定的压力时,破裂阀15形成开口而释放外壳3内的气体从而使内压降低。
破裂阀15具有局部地减小板厚而形成的槽。在蓄电元件1的内压上升时,破裂阀15沿着该槽断裂而形成瓣状(舌片状)的部分,该瓣状的部分因内压而向外侧跳起,由此在外壳形成开口。
如以上那样,即使例如在搭载蓄电元件1的车辆发生碰撞时等蓄电元件1发热,也能由玻璃纸片4抑制热量向相邻的构件传导,并且由破裂阀15降低内压。因此,能够防止在相邻地配设的其他蓄电元件1中连锁发热。
接着,在图4中示出了本发明的其他实施方式的蓄电模块。
蓄电模块具备多个上述的蓄电元件1、以及将多个蓄电元件1以与所述玻璃纸片4所相邻的蓄电元件1对置的方式并排保持的保持构件21。更详细而言,在蓄电模块中,多个蓄电元件1以外壳3的长侧面彼此对置、且树脂膜5彼此紧贴的方式被并排保持。
保持构件21由坚固的构件形成,例如形成为框形状、箱形状等,以便能够保持多个蓄电元件1。
蓄电模块还具备安装于正外部端子6以及负外部端子7的多个母线22,以便将多个蓄电元件1串联地电连接。
蓄电模块还具备保持于保持构件21、并与多个蓄电元件1的底面紧密接触的板状的冷却构件23。换句话说,在蓄电模块中,在水平配置的冷却构件23的上表面并排配置有多个蓄电元件1。蓄电元件1在外壳3的底面没有层叠玻璃纸片4,因此能够使外壳3、进而外壳3中的电极体2以及电解液的热量向冷却构件23高效地释放。
冷却构件23可以是水冷却型,也可以是空气冷却型。从提高冷却效果的观点出发,优选为水冷却型(液体制冷剂在内部通过的类型)。
并且,为了防止在蓄电元件1的外壳3与冷却构件23之间产生间隙而使热传导率变小的情况,蓄电模块也可以在蓄电元件1与冷却构件23之间具备例如由树脂片、凝胶片等形成的传热构件。
在蓄电模块中,即使例如在搭载蓄电元件1的车辆发生碰撞时等,某一个蓄电元件1发热,也能够通过玻璃纸片4来抑制蓄电元件1的热向相邻的蓄电元件1传导。因此,能够防止相邻的蓄电元件连锁地发热。
[其他实施方式]
所述实施方式并不对本发明进行限定。所述实施方式应解释为能够基于本说明书的记载以及技术常识来进行所述实施方式各部分的构成要素的省略、置换或者追加,且这些全部属于本发明的范围。
在蓄电元件中,玻璃纸片只要与外壳的一个以上的外表面接触即可,例如可以仅配置于一对长侧面,也可以配置于一对长侧面以及一方短侧面这三个面。
蓄电元件也可以在外壳的短侧面配设有外部电极。在该情况下,也可以在外壳的一对长侧面以及顶面配设玻璃纸片。
蓄电元件也可以不具有树脂膜。
蓄电模块也可以不具有冷却构件,也可以使冷却构件抵接于蓄电元件的侧面。
蓄电模块也可以具备分别具有玻璃纸片4的多个蓄电元件1,也可以在不具有玻璃纸片的多个蓄电元件之间配设玻璃纸片。玻璃纸片与相邻的蓄电元件的外壳接触。玻璃纸片也可以具备前述的树脂膜。
工业实用性
本发明的蓄电模块及蓄电元件能够特别适于作为车辆用的动力源来利用。
附图标记说明:
1 蓄电元件
2 电极体
3 外壳
4 玻璃纸片
5 树脂膜
6 正外部端子
7 负外部端子
8 正极板
9 负极板
10 分隔件
11 正极突片
12 负极突片
13 正极集电构件
14 负极集电构件
15 破裂阀
21 保持构件
22 母线
23 冷却构件。
Claims (8)
1.一种蓄电模块,具备:
多个蓄电元件,它们分别具有外壳;
玻璃纸片,其设置于所述蓄电元件之间且与所述外壳接触,并以玻璃纤维为主体;以及
保持构件,其对多个所述蓄电元件以及所述玻璃纸片进行保持,
所述玻璃纸片被压迫在所述蓄电元件之间。
2.根据权利要求1所述的蓄电模块,其中,
所述外壳具有短侧面、以及与所述短侧面正交且比所述短侧面面积大的长侧面,
所述玻璃纸片至少与所述长侧面接触。
3.根据权利要求2所述的蓄电模块,其中,
所述玻璃纸片在所述短侧面和所述长侧面的整体范围内覆盖所述外壳。
4.根据权利要求1至3中任一项所述的蓄电模块,其中,
所述玻璃纸片的平均厚度为0.2mm以上且1.0mm以下。
5.根据权利要求1至4中任一项所述的蓄电模块,其中,
所述玻璃纸片的空隙率为70%以上且97%以下。
6.根据权利要求1至5中任一项所述的蓄电模块,其中,
在对所述蓄电元件施加20N/cm2的压力的状态下,所述玻璃纸片的空隙率为45%以上且80%以下。
7.根据权利要求1至6中任一项所述的蓄电模块,其中,
所述蓄电模块进一步具备与所述玻璃纸片接触的树脂膜。
8.一种蓄电元件,具备:
外壳;以及
玻璃纸片,其与所述外壳接触,并以玻璃纤维为主体,
所述玻璃纸片的空隙率为70%以上且97%以下。
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PCT/JP2018/029455 WO2019031457A1 (ja) | 2017-08-08 | 2018-08-06 | 蓄電モジュール及び蓄電素子 |
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EP4152480A1 (en) * | 2021-09-21 | 2023-03-22 | Samsung SDI Co., Ltd. | Method of manufacturing an electrically insulated conductor |
DE102022205658A1 (de) | 2022-06-02 | 2023-12-07 | Volkswagen Aktiengesellschaft | Batteriezelle mit Batteriezellgehäuse und Wärmeisolationsschicht sowie Verfahren zur Herstellung einer solchen Batteriezelle |
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US11509015B2 (en) | 2022-11-22 |
US20200235358A1 (en) | 2020-07-23 |
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