CN115836427A - 具有软包电芯的可充电电池组以及方法 - Google Patents
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Abstract
本发明涉及一种具有堆叠在彼此顶部上的至少两个软包电芯的可充电电池组,其中软包电芯中的每个软包电芯被包封在金属箔中,其中金属箔彼此电绝缘,并且为了测量由金属箔形成的电容器电容,使金属箔中的每个金属箔电接触。
Description
技术领域
本发明涉及一种具有堆叠在彼此顶部上的至少两个软包电芯的可充电电池组。可充电电池组和软包电芯原则上从现有技术中是已知的。所谓的溶胀(也称为膨胀)的现象同样从现有技术中是已知的。这是有问题的,因为其可能导致软包电芯的外壳爆裂开。因此,可充电电池组自身或其电子器件可能进而损坏,这可能导致给用户带来风险。
背景技术
欧洲专利申请EP 3 591 739 A1描述了一种具有软包电芯的可充电电池组,其中该可充电电池组具有至少一个电流中断器,该电流中断器被设计成至少暂时中断从软包电芯汲取电流,其中该电流中断器由软包电芯的膨胀触发。
欧洲专利申请EP 3 588 607 A1披露了一种具有至少一个软包电芯的可充电电池组,其中该可充电电池组具有至少一根导电细丝,该导电细丝至少部分地围绕或界定该软包电芯,其方式使得该软包电芯的膨胀导致该细丝断开。
发明内容
本发明的目的是提供一种替代性配置的可充电电池组,该可充电电池组为提高操作安全性提供了基础。
该目的藉由以下而实现:金属箔彼此电绝缘,并且为了测量由金属箔形成的电容器电容,使金属箔中的每个金属箔电接触。
本发明包括以下知识:包封软包电芯的金属箔、或至少具有金属组分的箔可以用作电容器的电极。因此,电容器、并联电路或串联电路的电容器可以由堆叠在彼此顶部上的两个或更多个软包电芯构造。由一个或多个电容器形成的电容器电容可以有利地使用合适的电容测量电路来测量。电芯的变形改变了电极之间的距离,从而改变了电容器电容。电容的变化可以评估作为可充电电池组的一个或多个软包电芯的溶胀量度。软包电芯的溶胀可以具有不同的特征。由此可以设想到在溶胀过程中电极之间的平均距离增加。或者也可以设想到在溶胀过程中电极之间的平均距离减小。然而,在两种情况中,电容器电容都有变化,这可以用作电容检测的基础。
在特别优选的配置中,金属箔在堆叠方向上通过空气间隙彼此间隔开。已经发现,将电介质引入到空气间隙中是有利的。电介质例如可以是陶瓷电介质。已经发现,电介质是塑料、尤其是耐热塑料是有利的。在特别优选的配置中,塑料选自下组,该组包括:聚对苯二甲酸乙二醇酯(PET)、聚萘二甲酸乙二醇酯(PEN)、聚苯硫醚(PPS)、聚丙烯(PP)、聚四氟乙烯(PTFE)、聚苯乙烯(PS)、聚碳酸酯(PC)。已经发现,将电介质夹在和/或平坦地位于堆叠在彼此顶部上的至少两个软包电芯之间是有利的。通过这种方式,除了所期望的介电性质之外,软包电芯还可以保持稳定、或者例如在使用可充电电池组的过程中免受影响。电介质可以是金属塑料复合箔的一部分。
在进一步优选的配置中,金属箔各自被提供为金属复合箔、尤其提供为铝复合箔。已经发现,金属箔的相互面对的侧部各自限定电极是有利的。在进一步优选的配置中,电极彼此间隔开并且彼此电绝缘。
在特别优选的配置中,可充电电池组具有电连接至金属箔的电容测量电路。电容测量电路可以以集成电路的形式提供、和/或可以是可充电电池组或电动手持式动力工具的电池管理系统的一部分。对于后一种情况,电容测量电路可以完全或部分地是电动手持式动力工具自身的一部分。电容测量电路可以有利地用于测量电极之间的电容器电容。已经发现,连续监测电容器电容是有利的。可替代地,可以不连续监测电容器电容,例如当开始使用可充电电池时或在某些负载情况下定期地监测电容器电容。在特别优选的配置中,可充电电池组和/或可充电电池组的电池管理系统被设计成:当电容器电容的值变化了预定阈值时,中断或减小从可充电电池组汲取电流。
在进一步优选的配置中,可充电电池组具有滤波电路,该滤波电路被配置成滤除由碰撞和/或振动引起的电容器电容的变化。换言之,可以将电容器电容的变化(其本身仅仅是暂时的并且由电容测量电路确定)提供为不被可能提供的电池管理系统考虑。已经发现,滤波器被配置成滤除由热膨胀引起的电容器电容的仅仅暂时的变化是有利的。
在进一步优选的配置中,可充电电池组具有堆叠在彼此顶部上的多个软包电芯,其中两个相邻软包电芯的金属箔限定相应的电容器电容。以这种方式形成的电容器电容可以串联或并联耦合,并且连接至电容测量电路。可替代地,可以为每对相应相邻的软包电芯提供电容测量电路。
已经发现,可充电电池组被设计用于连接至电动手持式动力工具是有利的。可充电电池组有利地是具有电动手持式动力工具的系统的一部分。
本发明还提出一种用于测量上述类型的可充电电池组的软包电芯的溶胀的方法,其中将在金属箔之间形成的电容器电容的变化评估作为软包电芯溶胀的量度。已经发现,作为该方法的一部分,当电容器电容的值变化预定阈值时,中断或减小从可充电电池组汲取电流是有利的。
进一步的优点将从以下对附图的描述中变得明显。在附图中展示了本发明的各种示例性实施例。附图、说明书以及权利要求包含许多组合的特征。本领域技术人员还将方便地单独考虑这些特征并将它们进行组合以形成有用的进一步组合。
附图说明
在附图中,相同和相似的部件由相同的附图标记表示。
图1A示出了在软包电芯的正常状态下根据本发明的可充电电池组的第一优选示例性实施例。
图1B示出了在软包电芯的膨胀或溶胀状态下根据本发明的可充电电池组的第一优选示例性实施例。
具体实施方式
图1展示了根据本发明的可充电电池组100的优选示例性实施例。
可充电电池组例如配备有在堆叠方向SR上堆叠在彼此顶部上的两个软包电芯10、10'。软包电芯10、10'中的每个软包电芯被包封在金属箔11、11'中。金属箔11、11'被提供为铝复合箔并且彼此电绝缘。金属箔11、11'在堆叠方向上通过空气间隙15彼此间隔开。
金属箔11、11'的相互面对的侧部各自限定电极12、12',其中在彼此间隔开且彼此电绝缘的电极12、12'之间存在电容器电容。
电容器电容的值取决于电极12、12'之间的距离。这将参考子图更详细地说明,其中图1A示出了在正常(期望)状态ZN下的可充电电池组100,也就是说,软包电芯10、10'没有膨胀。
图1B示出了在溶胀(老化)状态ZA下的可充电电池组100,其中软包电芯10、10'在堆叠方向SR上明显地溶胀。在图1B中的溶胀(老化)状态ZA下,电极12、12'例如比图1A中的电极12、12'彼此更远地间隔开(至少平均而言彼此更远地间隔开)。由此存在于图1A中的可充电电池组100的电极12、12'之间的电容器电容CN大于存在于图1B中的可充电电池组100的电极12、12'之间的电容器电容CA。
电容器电容的这种变化可以用来检测软包电芯10、10'的溶胀。为此,经由电接触点13、13'使金属箔11、11'中的每个金属箔电接触,由此还使电极12、12'电接触。电接触点13、13'进而电连接至电容测量电路20,该电容测量电路可以用来测量随着电芯老化而变化的电容器电容。
如从图1A和图1B中可以获悉的,附加电介质17被引入到软包电芯10、10'之间的空气间隙15中。
应当提及的是,对于在此提出的测量原理,存在于软包电芯10、10'之间的空气自身已经足以作为电介质。由于引入的电介质17(在此,例如呈塑料条的形式),电容器电容原则上有利地增加,并且软包电芯10、10'同时彼此支撑抵靠。
附图标记列表
10,10'软包电芯
11,11'金属箔
12,12'电极
13,13'电接触点
15 空气间隙
17 电介质
20 电容测量电路
100 可充电电池组
SR堆叠方向
CA膨胀的软包电芯的电容器电容
CN正常软包电芯的电容器电容
ZA溶胀状态
ZN正常状态
Claims (11)
1.一种具有堆叠在彼此顶部上的至少两个软包电芯(10,10')的可充电电池组(100),其中这些软包电芯(10,10')中的每个软包电芯被包封在金属箔(11,11')中,
其特征在于,这些金属箔(11,11')彼此电绝缘,并且为了测量由这些金属箔(11,11')形成的电容器电容(CA,CN),使这些金属箔(11,11')中的每个金属箔电接触。
2.如权利要求1所述的可充电电池组(100),
其特征在于,该可充电电池组(100)具有电连接至这些金属箔(11,11')的电容测量电路(20)。
3.如权利要求2所述的可充电电池组(100),
其特征在于,该可充电电池组(100)具有电池管理系统,该电池管理系统被设计成:当该电容器电容的值变化了预定阈值时,中断或减小从该可充电电池组汲取电流。
4.如权利要求2或3所述的可充电电池组(100),
其特征在于,该可充电电池组(100)具有滤波电路,该滤波电路被配置成滤除由碰撞和/或振动引起的该电容器电容(CA,CN)的变化。
5.如前述权利要求之一所述的可充电电池组(100),
其特征在于,这些金属箔(11,11')在堆叠方向(SR)上通过空气间隙(15)彼此间隔开。
6.如前述权利要求之一所述的可充电电池组(100),
其特征在于,电介质(17)被引入到该空气间隙(15)中。
7.如权利要求6所述的可充电电池组(100),
其特征在于,该电介质(17)是塑料。
8.如前述权利要求之一所述的可充电电池组(100),
其特征在于,这些金属箔(11,11')各自被提供为金属复合箔、尤其被提供为铝复合箔。
9.如权利要求7所述的可充电电池组(100),
其特征在于,该电介质(17)是金属复合箔的一部分。
10.一种用于测量如前述权利要求之一所述的可充电电池组(100)的软包电芯的溶胀的方法,其中,在这些金属箔(11,11')之间形成的该电容器电容(CA,CN)的变化被评估作为这些软包电芯(10,10')的溶胀量度。
11.如权利要求9所述的方法,
其特征在于,当该电容器电容(CA,CN)的值变化了预定阈值时,中断或减小从该可充电电池组(100)汲取电流。
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EP20186137.4A EP3940858A1 (de) | 2020-07-16 | 2020-07-16 | Akkupack mit pouchzelle und verfahren |
EP20186137.4 | 2020-07-16 | ||
PCT/EP2021/068509 WO2022012992A1 (de) | 2020-07-16 | 2021-07-05 | Akkupack mit pouchzelle und verfahren |
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CN115836427A true CN115836427A (zh) | 2023-03-21 |
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EP (2) | EP3940858A1 (zh) |
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WO (1) | WO2022012992A1 (zh) |
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DE102021212386A1 (de) | 2021-11-03 | 2023-05-04 | Robert Bosch Gesellschaft mit beschränkter Haftung | Energiespeichervorrichtung und Verfahren zu einem Überwachen einer Energiespeichervorrichtung |
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KR101121757B1 (ko) * | 2007-11-07 | 2012-03-23 | 에스케이이노베이션 주식회사 | 스위치를 이용한 전기자동차용 2차 전지의 안전장치및 보호방법 |
US10003053B2 (en) * | 2015-02-04 | 2018-06-19 | Global Web Horizons, Llc | Systems, structures and materials for electrochemical device thermal management |
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EP3377363A4 (en) * | 2015-11-19 | 2019-08-07 | The Regents Of The University Of Michigan | BATTERY STATUS HEALTH ESTIMATION BASED ON SOURCE CHARACTERISTICS |
EP3588607A1 (de) | 2018-06-26 | 2020-01-01 | Hilti Aktiengesellschaft | Akkupack mit wenigstens einer pouchzelle |
EP3591739A1 (de) | 2018-07-03 | 2020-01-08 | Hilti Aktiengesellschaft | Sicherheitseinrichtung für batteriepacks mit pouchzellen durch mechanische stromunterbrecher |
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2021
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- 2021-07-05 EP EP21739667.0A patent/EP4182991B1/de active Active
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EP3940858A1 (de) | 2022-01-19 |
EP4182991B1 (de) | 2024-04-17 |
US20230253635A1 (en) | 2023-08-10 |
EP4182991A1 (de) | 2023-05-24 |
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