CN114050346B - 一种自吸热控温的电芯结构 - Google Patents
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Abstract
本发明专利公开了一种自吸热控温的电芯结构及其制作方法,包括电芯外壳、正极材料、负极材料、隔膜、集流片、绝缘垫片、内腔、冷媒、绝缘导热片、正极盖帽;所述正极材料与所述负极材料和所述隔膜以夹层式组装,所述集流片包括正极集流片和负极集流片,所述绝缘垫片设置于所述正极盖帽内侧,所述正极集流片穿过所述绝缘垫片与所述的正极盖帽连接,所述内腔设置于所述电芯外壳内部,且所述内腔包括外延的四个叶片,所述绝缘导热片设置于所述内腔与所述电芯外壳间,所述冷媒填充于所述的内腔内。本发明专利具有结构紧凑、自吸热控温,使得所生产制造的动力电池不易出现过热导致动力电池热失控,从而有效地提升动力电池的安全性。
Description
技术领域
本发明专利涉及动力电池设计及其制造领域,尤其涉及一种自吸热控温的电芯结构。
背景技术
锂离子动力电池具有高能量密度、高电压、长循环寿命的优势,被广泛的应用于新能源纯电动汽车、低速电瓶车和电动工具等作为动力能源的存储和供给系统,尤其是在近些年发展长续航里程、高能量密度的动力电池技术路线上,对动力电池的容量、倍率性能要求越来越高。但,随着动力电池的能量密度越来越大,其热安全性也将面临着更加严峻的挑战,装载高能量密度的纯电动汽车安全事故频发,在行驶、充电和静置过程中的着火爆燃事故给广大消费者造成严重的财产损失,危及人身安全。
虽然当前针对锂离子动力电池的安全性提升已有较多的结构设计与冷却方法,如专利CN201811644243.3公开了一种新能源电池冷却用微通道换热器,通过在电池之间设置导热板,将热量传递至微通道换热器进行转移,然而该结构设计致使电池模组整体的空间体积偏大,管路结构复杂;再如,专利CN201710543308.4公开了一种高安全性锂离子电池极耳结构,通过在极耳片上设置多根熔断壁,在过载极限大电流时先行熔断继而进行保护电池,该专利仅是从电气安全方面进行了保护设计。本发明专利通过内部设置吸热控温部件,从内往外的吸收电池在运行过程中产生的热量,大大降低了电池内核处于高温的时间段。该结构不仅紧凑,无需外部管路和泵力装置,降低电池模组的集成重量,也节省了部分热管理系统设计成本,具有广阔的应用前景。
发明内容
针对上述发明的不足,本发明专利通过一种自吸热控温的电芯结构,解决现有的动力电池模组热管理系统设计结构复杂、系统笨重以及需要消耗额外的能量,实现具有高度集成的、低成本的和自控温的电芯结构设计,提升动力电池的热安全性能。
为实现上述目的,本发明的技术方案为:
一种自吸热控温的电芯结构,其特征在于:包括电芯外壳、正极材料、负极材料、隔膜、集流片、绝缘垫片、内腔、冷媒、绝缘导热片、正极盖帽,所述正极材料、负极材料和隔膜以夹层叠片式组装,按照隔膜、正极材料、隔膜、负极材料、隔膜顺序叠片,所述的集流片包括正极集流片和负极集流片,且分别设置于所述正极材料与所述负极材料上,所述的绝缘垫片设置于所述正极盖帽内侧和所述电芯外壳底端内侧,所述正极集流片穿过所述绝缘垫片与所述正极盖帽连接,所述的内腔设置于所述电芯外壳内部,且所述内腔包括外延的四个叶片,所述内腔的四个叶片与所述电芯外壳构成四个扇形空间,用来堆放由所述隔膜、正极材料、隔膜、负极材料和隔膜组装好的夹层叠片,所述正极材料、负极材料和隔膜上开设有“凹”型凹槽,所述的“凹”型凹槽与所述内腔外延的叶片进行卡位式装配,所述正极材料、负极材料和隔膜上开设的“凹”型凹槽的高度要大于所述内腔上的叶片高度,并且所开设的“凹”型凹槽的高度要小于单层材料的高度,使得所述的正极材料、负极材料和隔膜单层材料在靠近正极盖帽一端分别连接成一个整体,所述的绝缘导热片设置于所述内腔叶片与所述电芯外壳间,所述的冷媒填充于所述的内腔内。
进一步地,所述的正极材料、负极材料和隔膜上开设有“凹”型凹槽,按照隔膜、正极材料、隔膜、负极材料、隔膜顺序夹层叠片,填充于所述内腔与所述电芯外壳构成的空间区域内,所述的“凹”型凹槽与所述内腔外延的叶片进行卡位式装配。
进一步地,所述的正极集流片设置于所述正极材料上,另一端与所述的正极盖帽连接,所述的负极集流片设置于所述负极材料上,另一端与所述电芯外壳内侧底端连接。
进一步地,所述的绝缘垫片设置于所述正极盖帽内侧和所述电芯外壳底端内侧,将所述内腔与所述正极盖帽、所述电芯外壳绝缘隔离开,所述正极集流片与所述负极集流片穿过所述绝缘垫片分别与所述正极盖帽和所述电芯外壳连接,所述绝缘垫片上设置有N个通孔。
进一步地,所述的内腔设置于所述电芯外壳内部,所述内腔包括外延的四个叶片,叶片与所述电芯外壳构成四个扇形空间,叶片内部设置有毛细吸力的芯材,所述内腔叶片与所述电芯外壳之间设置有绝缘导热片,所述内腔的材质为铝或铝合金或铜或铜合金。
进一步地,所述的冷媒填充于所述内腔中,所述冷媒的填充量控制在60%-80%之间,所述的内腔真空度为0至-0.09之间,所述冷媒为纯净水或水和乙醇混合物或乙醇或纳米相变流体。
通过本发明专利的实施可以有效的提升动力电池的热安全性,实现动力电池热管理系统高度集成化,降低系统的整体质量和功耗,有效延长新能源电动汽车的续航里程,提供较好的客服体验。
附图说明
图1为本发明专利一种自吸热控温的电芯结构整体示意图
图2为本发明专利正极材料、负极材料和隔膜与内腔的装配结构示意图
图3为本发明专利自吸热控温内腔结构示意图
图4为本发明专利正极盖帽与绝缘垫片结构示意图
图中:电芯外壳(1);正极材料(2);负极材料(3);隔膜(4);集流片(5);正极集流片(501);负极集流片(502);绝缘垫片(6);集流片通道(601);通孔(602);内腔(7);叶片(701);芯材(702);冷媒(8);绝缘导热片(9);正极盖帽(10);泄压孔(101)。
具体实施方式
下面将结合本发明专利实施案例中的附图,对本发明实施中的技术方案进行清晰、完整地描述,显然,所描述的实施案例仅仅是本发明专利一部分方式,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
实施案例1
参照图1至图4,本实施案例涉及电芯外壳(1)、正极材料(2)、负极材料(3)、隔膜(4)、集流片(5)、绝缘垫片(6)、内腔(7)、冷媒(8)、绝缘导热片(9)和正极盖帽(10):具体的所述正极材料(2)、负极材料(3)、隔膜(4)、集流片(5)、绝缘垫片(6)、内腔(7)、冷媒(8)、绝缘导热片(9)设置于所述电芯外壳(1)内部,所述正极盖帽(10)与所述电芯外壳(1)组装构成一个完整的圆柱型电池;所述的正极材料(2)、负极材料(3)和隔膜(4)按照隔膜(4)、正极材料(2)、隔膜(4)、负极材料(3)的顺序依次夹层叠片,直至填满整个所述电芯外壳(1)与所述内腔(7)所构成的空间;所述的集流片(5)包括正极集流片(501)和负极集流片(502),正极集流片(501)穿过所述的绝缘垫片(6)与所述的正极盖帽(10)进行连接,所述的负极集流片(502)穿过所述的绝缘垫片(6)与所述电芯外壳(1)内侧底端进行连接,从而实现构成动力电池的正负极端;所述的内腔(7)设置于所述电芯外壳(1)内部,所述内腔(7)内填充有所述冷媒(8),当电池在充电与放电时,所述冷媒(8)进行吸热热量从而控制电池的温度在合适的范围内,最终实现自吸热控温的功能。
参照图2所示,所述正极材料(2)、负极材料(3)和隔膜(4)与所述内腔(7)的装配结构如图2所示,在所述的正极材料(2)、负极材料(3)和隔膜(4)上开设有4个“凹”型凹槽,凹槽准确的与所述内腔(7)上设置的叶片(701)进行卡位式装配,所述的正极材料(2)、负极材料(3)和隔膜(4)上开设的“凹”型凹槽的高度要大于所述内腔(7)上的叶片(701)高度,并且所开设的“凹”型凹槽的高度要小于单层材料的高度,使得靠近正极盖帽(10)端的单层材料如正极材料(2)或负极材料(3)或隔膜(4)是连成一个整体的;所述的正极材料(2)每一片上都设置有正极集流片(501),将所有的正极集流片(501)进行汇合焊接,再穿过所述的绝缘垫片(6)上开设的集流片通道(602)与所述的正极盖帽(10)连接;所述的负极材料(3)每一片都设置有负极集流片(502),将所有的负极集流片(502)进行汇合焊接,再穿过所述的绝缘垫片(6)上开设的集流片通道(602)与所述的电芯外壳(1)内侧底端连接;所述的绝缘垫片(6)设置与所述正极盖帽(10)与所述内腔(7),以及所述电芯外壳(1)底端与所述内腔(7)之间,进行绝缘处理。
参照图3所示,所述的自吸热控温的内腔(7)包括外侧的四个叶片(701)以及叶片(701)内部设置的芯材(702),所述的四个叶片(701)外侧设置有一层绝缘导热片(9),使得叶片(701)与电芯外壳(1)之间实现绝缘导热,与所述正极材料(2)和所述负极材料(3)之间也实现绝缘导热;所述芯材(702)设置在叶片(701)的内侧,通过芯材(702)的毛细作用力实现冷媒(8)在内腔(7)与叶片(701)之间往复流动实现传热;所述冷媒(8)填充于所述内腔(7)之间,填充的量控制在60%-80%之间,所述内腔(7)的真空度为0至-0.09之间,通过抽真空使得所填充的冷媒(8)汽化沸点进一步降低,通过叶片(701)将热量传递至芯材(702),负载在芯材(702)上的冷媒(8)吸收电池产热的热量从而相变汽化,冷媒(8)的相变汽化温度设置为30-40℃之间,为纯净水或水与乙醇混合或乙醇或相变纳米流体,从而实现电池在运行过程中内核温度控制在30-40℃之间。
参照图4所示,所述的正极盖帽(10)和绝缘垫片(6)的结构如图4所示,在正极盖帽(10)上开设有4个泄压孔(101),当电池内部产生大量的气体,致使压力增大至设定上限值时,正极盖帽(10)上的泄压孔(101)将会打开进行泄压,所述的正极盖帽(10)与所述电芯外壳(1)的装配间设置有绝缘橡胶圈,进行绝缘处理;所述的绝缘垫片(6)包括通孔(602)和集流片通道(601),所述的通孔(602)是用来实现电池内部产生气体时进行泄压用,所述的集流片通道(601)是用来穿过所述正极集流片(501)和负极集流片(502)所用。
以上所述仅为本发明专利的实施案例之一,并不用以限定本发明专利,凡在本发明专利的精神和原则之内所做的任何修改、等同替换、改进等,均应包含在本发明专利的保护范围之内。
Claims (5)
1.一种自吸热控温的电芯结构,其特征在于:包括电芯外壳、正极材料、负极材料、隔膜、集流片、绝缘垫片、内腔、冷媒、绝缘导热片、正极盖帽,所述正极材料、负极材料和隔膜以夹层叠片式组装,按照隔膜、正极材料、隔膜、负极材料、隔膜顺序叠片,所述的集流片包括正极集流片和负极集流片,且分别设置于所述正极材料与所述负极材料上,所述的绝缘垫片设置于所述正极盖帽内侧和所述电芯外壳底端内侧,所述正极集流片穿过所述绝缘垫片与所述正极盖帽连接,所述的内腔设置于所述电芯外壳内部,且所述内腔包括外延的四个叶片,所述内腔的四个叶片与所述电芯外壳构成四个扇形空间,用来堆放由所述隔膜、正极材料、隔膜、负极材料和隔膜组装好的夹层叠片,所述正极材料、负极材料和隔膜上开设有“凹”型凹槽,所述的“凹”型凹槽与所述内腔外延的叶片进行卡位式装配,所述正极材料、负极材料和隔膜上开设的“凹”型凹槽的高度要大于所述内腔上的叶片高度,并且所开设的“凹”型凹槽的高度要小于单层材料的高度,使得所述的正极材料、负极材料和隔膜单层材料在靠近正极盖帽一端分别连接成一个整体,所述的绝缘导热片设置于所述内腔叶片与所述电芯外壳间,所述的冷媒填充于所述的内腔内。
2.根据权利要求1所述的一种自吸热控温的电芯结构,其特征在于:所述的正极集流片设置于所述正极材料上,另一端与所述的正极盖帽连接,所述的负极集流片设置于所述负极材料上,另一端与所述电芯外壳内侧底端连接。
3.根据权利要求1所述的一种自吸热控温的电芯结构,其特征在于:所述的绝缘垫片设置于所述正极盖帽内侧和所述电芯外壳底端内侧,将所述内腔与所述正极盖帽、所述电芯外壳绝缘隔离开,所述正极集流片与所述负极集流片穿过所述绝缘垫片分别与所述正极盖帽和所述电芯外壳连接,所述绝缘垫片上设置有N个通孔。
4.根据权利要求1所述的一种自吸热控温的电芯结构,其特征在于:所述内腔包括外延的四个叶片,叶片与所述电芯外壳构成四个扇形空间,叶片内部设置有毛细吸力的芯材,所述内腔叶片与所述电芯外壳之间设置有绝缘导热片,所述内腔的材质为铝或铝合金或铜或铜合金。
5.根据权利要求1或4所述的一种自吸热控温的电芯结构,其特征在于:所述冷媒的填充量控制在60%-80%之间,所述的内腔真空度为0至-0.09之间,所述冷媒为纯净水或水和乙醇混合物或乙醇或纳米相变流体。
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