CN105745782A - 电池模块 - Google Patents
电池模块 Download PDFInfo
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- CN105745782A CN105745782A CN201580000408.1A CN201580000408A CN105745782A CN 105745782 A CN105745782 A CN 105745782A CN 201580000408 A CN201580000408 A CN 201580000408A CN 105745782 A CN105745782 A CN 105745782A
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- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
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Abstract
本发明涉及一种电池模块,该电池模块包括一个或者多个电池单体单元,并且该电池单体单元包括电池单体、位于电池单体的外周表面周围的固定部件和位于电池单体和固定部件之间的热吸收材料,并且结果,抑制电池模块内的发热,并且可以抑制在串联连接的电池单体单元之间的着火。相应地,电池可以呈现优良的充电和放电效率、优良的循环性质和寿命性质而不用担心电池模块爆炸或者着火。
Description
技术领域
本公开涉及一种能够通过抑制电池模块内的发热而增强电池的寿命性质、循环性质以及充电和放电效率的电池模块。
背景技术
作为无线移动装置的能源,近来已经广泛地使用了能够充电和放电的二次电池。另外,作为电动车辆、混合动力电动车辆等的能源,二次电池也已经受到关注,电动车辆、混合动力电动车辆等是作为用于解决使用化石燃料的现有汽油车辆或者柴油车辆的空气污染问题的装置而提供的。由于二次电池的很多其它优点,使用二次电池的应用的类型已经广泛地多样化,并且预期将来会在更加多样的领域中的产品中使用二次电池。
二次电池根据在使用这种二次电池的领域和产品中要求的输出和容量具有不同的构造。例如,小型移动装置诸如移动电话、PDA、数字照相机和膝上型计算机每一个装置使用包括一个或者两个、三个或者四个电池单体的小型电池组,从而响应于对应产品的小型化和轻薄化的趋势。同时,由于高输出和高容量的必要性,中型和大型装置诸如电动自行车、电动车辆或者混合动力电动车辆使用电连接到多个电池单体的中型和大型电池组。电池组的尺寸和重量直接地与对应的中型和大型装置等的储存空间、输出等有关,因此,制造公司作出努力以制备尽可能小的并且轻的电池组。镍氢二次电池已经最广泛地被用作电池组的电池单体,然而,近来,考虑到容量地提供高输出的锂二次电池已经得到广泛研究,并且某些锂二次电池已经得到商业化。
然而,锂二次电池存在具有低稳定性的根本问题。具体地,当锂二次电池充电和放电时,在电池组内产生大量的热。其中,在电池单体,特别地,电区域诸如电极端子或者连接器中产生了大量的热。而且,在电连接的构造中主要地对于电极端子、连接器等要求绝缘性质,并且在很多情形中,电极端子或者连接器被支撑在绝缘部件上,或者在一种特殊结构中插入绝缘部件。相应地,在电极端子或者连接器中产生的热不能被有效地释放,并且趋向于积聚。结果,在电极端子、连接器等中发生变形,并且最终引起电池组的电阻的改变。
这种电阻的改变使得电池组的操作状况和稳定性变差,因此,需要加以抑制。特别地,在使用多个电池单体的中型和大型电池组中,和在使用锂二次电池作为电池单体的电池组中,在稳定性方面,热积聚可以成为一个严重的问题。相应地,对于能够根本上解决这种问题的技术的需求已经增加。
发明内容
技术问题
鉴于上述,已经作出了本发明,并且本发明的目的在于提供一种电池模块,该电池模块能够通过吸收在电池模块内产生的热来抑制电池模块内的温度增加而增强电池的寿命性质、循环性质和充电和放电效率,并且还防止在串联连接的电池单体单元之间的着火。
技术方案
本发明的一个实施例提供一种电池模块,其包括一个或者多个电池单体单元,其中该电池单体单元包括电池单体、位于电池单体的外周表面周围的固定部件以及位于电池单体和固定部件之间的热吸收材料。
本发明的另一个实施例提供一种包括作为单元模块的电池模块的电池组。
本发明的再一个实施例提供一种包括该电池组的装置。
有利的效果
在根据本发明的电池模块中,包括电池单体和位于电池单体的外周表面周围的固定部件的电池单体单元包括在电池单体和固定部件之间的热吸收材料,并且因此,通过吸收在电池模块内产生的热能够抑制电池模块内的温度增加,并且还能够防止在串联连接的电池单体单元之间的着火。结果,电池能够呈现优良的充电和放电效率、优良的循环性质和优良的寿命性质而不用担心电池模块爆炸或者着火。
附图说明
附于本说明书的以下附图示意本发明的优选实施例,并且与上述说明一起地执行进一步阐明本发明的技术构思的作用,并且因此,本发明不被解释为仅仅限制于在附图中描述的细节。
图1是根据本发明的实施例的电池模块的透视图。
图2是在图1的电池模块中包括的一个电池单体单元的透视图。
图3是在根据本发明的实施例的电池模块中包括的电池单体的透视图。
图4是图3的分解透视图。
图5是示出对照实例的穿刺测试结果的曲线图。
图6是示出实例1的穿刺测试结果的曲线图。
[附图标记的说明]
100:电池单体
110:袋型电池外壳
112:储存单元
114:上壳
116:下壳
120:电极组件
122:正极接线片
124:负极接线片
132,134:电极端子
140:绝缘膜
200:电池模块
210:固定部件
220:热吸收材料
300:电池单体单元
301:第一电池单体单元
302:第二电池单体单元
具体实施方式
在下文中,将参考附图详细描述本发明的实施例以使得本领域技术人员易于实施本发明。然而,本发明可以以各种不同的形式实施,并且不限于在这里描述的实施例。
根据本发明的一个实施例的电池模块包括一个或者多个电池单体单元,并且该电池单体单元包括电池单体、位于电池单体的外周表面周围的固定部件以及位于电池单体和固定部件之间的热吸收材料。
通常通过在电池单体的外周表面和固定部件之间的微隙释放在电池单体单元内产生的热。关于这点,在本发明中,通过在电池单体的外周表面和固定部件之间放置热吸收材料,通过有效地吸收在电池单体单元中产生的热,电池模块内的温度增加可以受到抑制。另外,通过在诸如以上的位置处形成热吸收材料,与在电池单体单元的整个表面上或者在与相邻电池单体的单元单体的交界层处放置热吸收材料的情形相比较,可以在最小化所使用的热吸收材料的量的同时获得优良的热吸收效率。另外,通过诸如以上的热吸收材料吸收在电池模块内产生的热,由于在电池模块内产生的高温热而导致正极(positiveelectrode)或者负极(negativeelectrode)材料经历化学反应,并且结果,可以防止电池着火或者爆炸,并且可以防止在串联连接的电池单体单元之间的着火。
图1是根据本发明的实施例的电池模块的透视图,并且图2是在该电池模块中包括的一个电池单体单元的透视图。图1和图2仅仅用于示意性的意图,并且本发明不限于此。另外,为了描述方便起见,未在图1中示出通常在电池模块中包括的外罩、电缆、安全电路等。
当参考图1和图2时,根据本发明的实施例的电池模块200包括一个或者多个或者两个或者更多个电池单体单元300诸如第一电池单体单元301和第二电池单体单元302。另外,当电池模块200包括两个或者更多个电池单体单元时,可以包括形成层叠结构的每一个电池单体单元,在该层叠结构中,每一个电池单体单元被相继地层叠。
同时,在电池模块200中,电池单体单元300包括电池单体100、位于电池单体的外周表面周围的固定部件210以及位于电池单体和固定部件之间的热吸收材料220。
在电池单体单元300中,电池单体100不被特别地限制,只要当构造电池模块或者电池组时它能够提供高电压和高电流即可,并且其实例可以包括具有大的单位体积能量储存量的锂二次电池。
另外,电池单体100可以是在有限的空间中提供高层叠因子的板型电池单体,并且当电池模块200包括两个或者更多个电池单体单元时,板型电池单体的一个表面或两个表面可以被层叠以布置成面对相邻电池单体单元中的电池单体。
另外,板型电池单体包括:层叠片外壳,该层叠片外壳包括树脂层和金属层;和电极组件,该电极组件内置于该外壳中,并且板型电池单体可以是其中外壳的外周表面通过热结合等而被密封的袋型电池单体。
更加具体地,电池单体100是其中将具有正极/分隔物/负极结构的电极组件与电解质一起地密封在电池外壳内的袋型电池单体,并且可以形成为板型,该板型是通常具有与宽度相比而言的小的厚度的近似长方体结构。这种袋型电池单体通常形成有袋型电池外壳,并且电池外壳可以以层叠片结构形成,在该层叠片结构中,相继地层叠如下各层:外涂层,该外涂层由具有优良的耐久性的聚合树脂形成;阻挡层,该阻挡层由针对湿气、空气等呈现屏障性质的金属材料形成;和内密封剂层,该内密封剂层由可热结合的聚合树脂形成。
另外,当电池单体100是袋型电池单体时,电池单体100可以被固定部件210固定,该固定部件210被一体地组合从而包围通过热结合而密封的袋型电池单体的外周表面。
图3是在根据本发明的实施例的电池模块上安装的电池单体的透视图,并且图4是图3的分解透视图。图3和图4仅仅用于示意性的意图,并且本发明不限于在图3和图4中提供的结构。
当参考图3和图4时,电池单体100特别地具有如下结构,其中,在袋型电池外壳110内密封以正极、负极和在其间布置的分隔物形成的电极组件120,使得它的正极接线片和负极接线片122、124和两个电连接的电极端子132、134被暴露于外部。
在电池单体100中,电池外壳110由上壳114和下壳116形成,该上壳114和下壳116包括用于安全地安置电极组件120的凹形储存单元112。
另外,在电池单体100中,电极组件120可以具有折叠型、堆叠型或者堆叠和折叠型结构,该折叠型、堆叠型或者堆叠和折叠型结构折叠、堆叠或者堆叠和折叠包括正极、负极和在其间布置的分隔物的层叠结构。
另外,在电极组件120中,多个正极接线片122和多个负极接线片124每一个均与电极端子132、134结合并组合在一起。进而,可以进一步在电极端子132、134的上和下表面上包括绝缘膜140,从而当利用热结合机将电池外壳110的上壳114和下壳116的外周表面热结合时,防止了在这种热结合机和电极端子132、134之间发生短路,并且确保了在电极端子132、134和电池外壳110之间的密封性质。
另外,电池单体100可以具有如下结构,其中正极端子和负极端子在外周表面的一侧上突出;或者正极端子在外周表面的一侧上突出,负极端子在相反侧上突出。在这里,电池单体100可以具有如下结构,其中固定部件210被一体地组合到除了正极端子和负极端子的整个外周表面。
同时,在电池单体单元200中,如在图1和图2中所示,固定部件210位于电池单体100的外周表面上。
固定部件210一体地组合到电池单体100的外周表面的一部分或全部,并且执行固定电池单体100的作用。固定部件210的材料不被特别地限制,并且其实例可以包括橡胶或者塑料。更加具体地,固定部件可以由作为弹性材料的热塑性聚安酯(TPU)、硅基树脂(silicone-basedresin)等形成。即使当施加了外部力和振动时,由具有弹性的这种材料形成的固定部件210仍然固定电池单体100,在不添加过度的压力时准确地固定电池单体100,并且吸收冲击,并且结果,能够增强电池单体100的稳定性。
另外,电池单体100的外周表面的一部分或全部和固定部件210的组合可以使用各种方法诸如组装、附着和模制来实现,并且更加具体地,可以获得一种通过嵌件注射成型而一体地组合的结构。换言之,电池单体100的外周表面通过嵌件注射成型而组合到固定部件210,并且结果,电池单体100可以稳定地附接到固定部件210。
另外,在电池单体单元200中,热吸收材料220位于电池单体100的外周表面与固定部件210之间。
具体地,热吸收材料220可以形成在电池单体100的外周表面和固定部件210彼此接触的表面的至少一部分上,并且更加具体地,可以在电池单体100的外周表面和固定部件210彼此接触的整个表面上形成。
另外,当电池模块包括两个或者更多个电池单体单元时,热吸收材料220可以被进一步选择性地包括在电池单体单元之间,即,在电池单体单元的层叠结构中在一个电池单体单元的表面与相邻电池单体单元的面对表面之间,以及在电池单体100的外周表面和固定部件210彼此接触的表面上。特别地,可以在第一电池单体单元301和第二电池单体单元302之间包括热吸收材料220。
进而,电池模块可以包括两个或者更多个电池单体单元,并且电池单体单元的表面和相邻电池单体单元的面对表面可以在具有在其间设置的热吸收材料的同时彼此接触。换言之,电池单体单元的表面和相邻电池单体单元的面对表面可以在在其间设置了热吸收材料的同时彼此接触。
如上所述,通过使电池单体单元300在电池单体100的外周表面和固定部件210彼此接触的表面的至少一部分上,并且在第一电池单体单元301和电池单体单元302的面对表面之间包括热吸收材料220,可以抑制在串联连接的电池单体单元301、302之间的另外的着火,并且通过吸收在电池模块200内产生的热,可以抑制电池模块200中的温度增加。结果,可以防止电池模块200的爆炸和着火,并且可以进一步增强电池的充电和放电效率、电池的循环性质和寿命性质。
特别地,热吸收材料220包括水(H2O)和二氧化硅。
关于水,不包括杂质的纯净水是优选的而不用担心副反应。
另外,基于热吸收材料的总重量,可以包括按照重量75%到95%的水。当在热吸收材料中水含量按照重量小于75%时,二氧化硅的含量相对地增加,从而引起热吸收性质下降。当水含量按照重量大于95%时,二氧化硅的含量相对地降低,从而引起热吸收性质下降。当考虑通过在热吸收材料中包括水而实现的改进效果的重要性时,基于热吸收材料的总重量,优选地包括按照重量80%到90%的纯净水。
同时,在热吸收材料中,二氧化硅(SiO2)是在各种热吸收无机材料中不仅自身呈现高的热稳定性而且还呈现更加优良的热吸收性质的材料。二氧化硅可以是结晶或者无定形的,或者结晶和无定形二氧化硅的混合物。另外,作为结晶二氧化硅,可以特别地包括具有较高热稳定性的多态性诸如石英、鳞石英或者方石英,并且可以使用其中的任何一个,或者其中的两个或者更多个的混合物。
基于热吸收材料的总重量,可以包括按照重量5%到25%的二氧化硅。当二氧化硅含量按照重量小于5%时,二氧化硅含量太小,从而引起热吸收性质下降,并且不能恰当地执行热吸收材料的作用。当二氧化硅含量按照重量大于25%时,热吸收性质可以下降。当考虑通过在热吸收材料中包括二氧化硅而实现的改进效果的重要性时,基于热吸收材料的总重量,更加特别地包括按照重量10%到20%的二氧化硅。
本发明的另一个实施例提供一种包括作为单元模块的电池模块200的电池组。
可以通过根据目标输出和容量组装作为单元模块的上述电池模块而制造该电池组。考虑到安装效率、结构稳定性等,该电池组可以用作电动车辆、混合动力电动车辆、插电式混合动力电动车辆、电力储存装置等的电源,然而,应用范围不限于此。
本发明的再一个实施例提供了一种使用该电池组作为电源的装置。
特别地,该装置可以是电动车辆、混合动力电动车辆、插电式混合动力电动车辆或者电力储存装置。这种装置的结构和制造方法在本技术领域中是已知的,因此,将不在本说明书中包括关于它的详细说明。
在下文中,将参考实例更加具体地描述本发明。然而,以下实例仅仅用于示意性的意图,并且本发明的范围不限于此。
[实例1:电池模块的制造]
制造了具有如在图1到图4中所示结构的电池模块。
具体地,通过向水和乙醇的混合溶剂(水和乙醇的混合体积比率=90:10)添加作为负极活性材料的按照重量97%的人造石墨、按照重量1.5%的羧甲基纤维素(CMC)和按照重量1.5%的丁苯橡胶(SBR)粘结剂而制备水性负极浆液,并且然后在铜(Cu)箔上涂覆水性负极浆液、将其干燥并且卷起以制备负极。
另外,通过向水和乙醇的混合溶剂(水和乙醇的混合体积比率=90:10)添加作为正极活性材料的按照重量95%的LiCoO2、按照重量3%的Super-P(导体)和按照重量2%的SBR粘结剂来制备正极浆液,并且然后在铝箔上涂覆正极浆液、将其干燥并且卷起以制备正极。
在通过在所制备的负极和正极之间设置聚烯烃分隔物而制备电极组件之后,通过将电极组件放置在袋中而密封电极组件,并且通过将电解质注射到袋中而制备电池单体100。在这里,使用包含1MLiPF6的碳酸亚乙酯(EC)/碳酸甲乙酯(EMC)基溶液(混合重量比率EC/EMC=2:8)作为电解质。
涂覆以80:20的混合重量比率包括水和二氧化硅的热吸收材料220从而包围所制备的电池单体100的外周表面,并且然后通过将塑料固定部件组合于此而制备电池单体单元300。将6个这种电池单体单元300层叠(单体#1、2、3、4、5、6)以制造电池模块200。
[实例2:电池模块的制造]
除了将3个电池单体单元层叠之外,以与在实例1中相同的方式制造电池模块。
[实例3:电池模块的制造]
除了通过当层叠电池单体单元(单体#1、2、3、4、5、6)时在每一个层叠的电池单体之间涂覆热吸收材料而进一步在电池单体单元的表面和相邻电池单体单元的面对表面之间形成热吸收材料之外,以与在实例1中相同的方式制造电池模块。
[对照实例:电池模块的制造]
除了不在电池单体的外周表面上形成热吸收材料,并且将5个电池单体单元层叠之外,以与在实例1中相同的方式制造电池模块。
[测试实例:关于电池模块的穿刺测试]
在于实例1和对照实例中制造的电池模块上,实施其中钉子穿过3个电池单体单元的穿刺测试。结果在图5和图6中示出。
图5是示出关于对照实例的电池模块的穿刺测试结果的曲线图,并且图6是示出关于实例1的电池模块的穿刺测试结果的曲线图。
如在图5中所示,在其中不涂覆热吸收材料的对照实例的电池模块中,不仅在穿刺测试中被钉子穿透的该3个电池单体单元(单体#1、2、3),而且与被钉子穿透的该3个电池单体单元相邻的其余的电池单体单元由于在内部产生的热的传递而爆炸并且着火,并且结果,不能实现作为电池的性能。
然而,如在图6中所示,在其中涂覆热吸收材料的实例1的电池模块中,被钉子穿透的该3个电池单体单元丧失了作为电池的功能,然而,在不被钉子穿透的电池单体单元中,所涂覆的热吸收材料吸收在电池模块内产生的热并且阻挡热向周围的相邻电池传递,并且呈现出电池功能,而不发生爆炸和着火。
根据如上的测试结果,能够看到,根据本发明的实施例的电池模块包括在电池单体的外周表面和固定部件彼此接触的表面的至少一部分上的热吸收材料,并且因此,热吸收材料吸收在电池模块内产生的热并且抑制发热,并且抑制在串联连接的电池单体单元之间的另外的着火,并且结果,能够防止电池模块的爆炸和着火。
Claims (17)
1.一种电池模块,所述电池模块包括一个或者多个电池单体单元,
其中,所述电池单体单元包括电池单体、位于所述电池单体的外周表面周围的固定部件以及位于所述电池单体和所述固定部件之间的热吸收材料。
2.根据权利要求1所述的电池模块,其中,所述电池模块包括两个或者更多个电池单体单元,并且所述电池模块进一步包括在所述电池单体单元的表面和相邻的电池单体单元的面对表面之间的热吸收材料。
3.根据权利要求1所述的电池模块,其中,所述电池模块包括两个或者更多个电池单体单元,并且所述电池单体单元的表面和相邻的电池单体单元的面对表面在其间设置有热吸收材料的同时彼此接触。
4.根据权利要求1所述的电池模块,其中,所述电池单体是板型电池单体,并且所述电池模块包括两个或者更多个电池单体单元,并且所述板型电池单体的一个表面或两个表面被层叠以布置成面对相邻电池单体单元中的电池单体。
5.根据权利要求4所述的电池模块,其中,所述板型电池单体是袋型电池单体,所述袋型电池单体包括:层叠片外壳,在所述层叠片外壳中顺序地层叠树脂层和金属层;和电极组件,所述电极组件内置于所述外壳中,并且所述外壳的外周表面被密封。
6.根据权利要求5所述的电池模块,其中,固定部件被一体地组合从而包围被密封的所述袋型电池单体的外周表面。
7.根据权利要求1所述的电池模块,其中,正极端子和负极端子在所述电池单体的所述外周表面的一侧上突出;或者正极端子在所述外周表面的一侧上突出,负极端子在相反侧上突出。
8.根据权利要求7所述的电池模块,其中,固定部件被一体地组合到除了所述正极端子和所述负极端子之外的整个所述外周表面。
9.根据权利要求1所述的电池模块,其中,所述固定部件包括橡胶或者塑料。
10.根据权利要求1所述的电池模块,其中,所述固定部件包括硅基树脂或者热塑性聚安酯。
11.根据权利要求1所述的电池模块,其中,所述热吸收材料包括水和二氧化硅。
12.根据权利要求11所述的电池模块,其中,所述热吸收材料包括按照重量75%到95%的水和按照重量5%到25%的二氧化硅。
13.根据权利要求11所述的电池模块,其中,所述二氧化硅包括选自石英、鳞石英和方石英中的至少一种。
14.根据权利要求1所述的电池模块,其中,所述电池单体是锂二次电池。
15.一种电池组,所述电池组包括作为电池模块的根据权利要求1到14中的任一项所述的电池模块。
16.一种装置,包括根据权利要求15所述的电池组。
17.根据权利要求16所述的装置,所述装置选自电动车辆、混合动力电动车辆、插电式混合动力电动车辆和电力储存装置。
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