CN114641881A - 可再充电电池 - Google Patents
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- CN114641881A CN114641881A CN202180006283.9A CN202180006283A CN114641881A CN 114641881 A CN114641881 A CN 114641881A CN 202180006283 A CN202180006283 A CN 202180006283A CN 114641881 A CN114641881 A CN 114641881A
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Abstract
根据本发明的示例性实施例的可再充电电池包括:电极组件,包括第一电极、第二电极以及位于所述第一电极与所述第二电极之间的隔板;壳体,具有容纳所述电极组件的内部空间以及带有一个敞开侧的开口;盖板,联接到所述壳体的所述开口,并且具有暴露所述内部空间的端子孔;和电极端子,穿过所述端子孔电连接到所述电极组件,并且与所述盖板重叠,其中,所述隔板具有比所述第一电极和所述第二电极大的宽度,并且所述隔板与所述壳体的内底表面接触。
Description
技术领域
本发明涉及一种可再充电电池。更具体地,本发明涉及一种超小型可再充电电池
背景技术
与不能再充电的一次电池不同,可再充电电池可重复充电和放电。低容量可再充电电池已经用于小型电子设备,诸如移动电话、膝上型电脑和摄像机,并且大容量电池已经广泛用作用于驱动混合动力车辆的电机的电源。
典型的可再充电电池包括镍镉(Ni-Cd)电池、镍氢(Ni-MH)电池、锂(Li)电池和锂离子(Li-ion)可再充电电池。特别地,锂离子二次电池的工作电压比主要用作便携式电设备的电源的镍镉电池或镍氢电池的工作电压高出约三倍。此外,锂离子二次电池广泛用在单位重量能量密度高的方面中。
特别地,随着对可穿戴设备(诸如头戴式耳机、耳机、智能手表和使用蓝牙的装在身体上的医疗设备)的需求增加,对能量密度高且超小的可再充电电池的需要也在增加。
这种超小型可再充电电池的尺寸小,因此取决于壳体内部的结构,可再充电电池的容量差异大。
发明内容
因此,本公开旨在提供一种可再充电电池,其通过使可再充电电池的壳体内部结构最小化来提高可再充电电池的容量。
根据本发明的示例性实施例的可再充电电池包括:电极组件,包括第一电极、第二电极以及位于所述第一电极与所述第二电极之间的隔板;壳体,具有容纳所述电极组件的内部空间以及带有一个敞开侧的开口;盖板,联接到所述壳体的所述开口,并且具有暴露所述内部空间的端子孔;和电极端子,穿过所述端子孔电连接到所述电极组件,并且与所述盖板重叠,其中,所述隔板具有比所述第一电极和所述第二电极大的宽度,并且所述隔板与所述壳体的内底表面接触。
可进一步包括第一电极接线片,将所述第一电极和所述壳体的所述内底表面电连接;和第二电极接线片,将所述第二电极和所述电极端子电连接。
可进一步包括第一带,以比所述第二电极接线片大的面积附接到所述第二电极接线片的下表面,以在所述第二电极接线片与所述电极组件之间绝缘;和第二带,沿所述电极组件的直径方向外周表面附接,并且围绕所述电极组件的外侧包裹,以在所述电极组件的外侧与所述壳体的内侧之间绝缘。
可进一步包括绝缘盘,位于所述第二电极接线片与所述电极组件的顶表面之间,并且在所述电极端子与所述电极组件之间绝缘。
可进一步包括绝缘垫圈,位于所述第二电极接线片与所述盖板之间,并且在所述第二电极接线片与所述盖板之间绝缘,并且所述绝缘垫圈可具有对应于所述电极端子移除的部分。
所述盖板可被焊接到所述壳体,并且所述盖板和所述壳体可由相同的金属制成。
所述电极端子可包括凸缘部,覆盖所述端子孔并且与所述盖板重叠;和突出部,与所述凸缘部整体形成,并且从所述凸缘部朝向所述端子孔突出。
所述突出部的外侧可具有曲面和斜面,从所述曲面到所述盖板的暴露于所述端子孔的端部的距离比从所述斜面到所述盖板的暴露于所述端子孔的端部的距离短,并且从所述盖板的暴露于所述端子孔的端部朝向所述斜面的端部的距离可变长。
可进一步包括热熔层,位于所述盖板与所述凸缘部之间,并且绝缘结合在所述盖板与所述凸缘部之间。
所述热熔层可在预定温度下熔化。
在本发明中,在没有在电极组件的下表面与壳体之间安装绝缘构件的情况下,可提供一种可再充电电池,在该可再充电电池中电极组件的下表面与壳体之间的短路被防止并且可再充电电池的容量被最大化。
附图说明
图1是示出根据本发明的示例性实施例的可再充电电池的透视图。
图2是沿图1的Ⅱ-Ⅱ线截取的截面图。
图3是用于说明根据本发明的示例性实施例的第一带的附接状态的视图。
图4是图2的部分A的截面图。
图5是示出根据本发明的另一示例性实施例的可再充电电池的截面图。
图6是图5的部分B的截面图。
具体实施方式
下文将参考附图更全面地描述本发明,在附图中示出本发明的示例性实施例。如本领域技术人员将意识到的,可以以各种不同的方式修改所描述的实施例,所有这些方式都不脱离本发明的范围。
此外,除非被明确相反描述,否则词语“包括”以及诸如“包含”或“含有”的变型将被理解为暗指包括所述元件,但不排除任何其它元件。
下文中,参考附图描述根据示例性实施例的可再充电电池。
根据本发明的示例性实施例的作为超小型可再充电电池的可再充电电池可以是硬币型电池(硬币电池)或纽扣型电池(纽扣电池),但不限于此,并且它可以是圆柱形或针型电池。
这里,硬币型电池或纽扣型电池是薄的硬币或按钮形状的电池,并且可以指高度与直径之比(高度/直径)为1或更小的电池,但不限于此。
由于硬币电池或纽扣电池主要呈圆柱形,所以水平截面呈圆形,但本发明不限于此,并且水平截面可以是椭圆形或多边形。在这种情况下,直径被确定为基于电池的水平方向的外壳(或壳体)外周的最大距离,并且高度被确定为基于电池的竖直方向的最大距离(从平底截面到平顶截面的距离)。
图1是示出根据本发明的示例性实施例的可再充电电池的透视图,图2是沿图1的Ⅱ-Ⅱ线截取的截面图,并且图3是用于说明根据本发明的示例性实施例的第一带的附接状态的视图。
参考图1和图2,根据本发明的示例性实施例的可再充电电池1000包括电极组件100、具有用于容纳电极组件100的内部空间的壳体200、联接到壳体200并密封内部空间的盖板300,以及穿过盖板并电连接到电极组件100的电极端子400。
电极组件100的下表面面向壳体200的内底表面,并且电极组件100的上表面面向覆盖壳体200的开口21的盖板300的下表面。
电极组件100包括第一电极11、第二电极12和隔板13,并且第一电极11和第二电极12分别位于为电绝缘材料的隔板13的两侧。
第一电极11包括电极活性区域和电极未涂覆区域,电极活性区域是将活性物质涂敷在长条带形状的金属箔形成的薄板上的区域,电极未涂覆区域是未涂敷活性物质的区域,并且第一电极接线片14可连接到电极未涂覆区域。
电极未涂覆区域可形成在相对于电极活性部分的相反端处,即,第一电极11的长度方向上的两端处,但不限于此,并且电极未涂覆区域可形成在一端处。第一电极11可以是负电极,并且可将诸如石墨或碳的活性物质涂敷到用于电极活性区域的诸如铜或镍的金属箔上。
第一电极接线片14电连接到电极组件100的第一电极11的电极未涂覆区域,从电极组件100突出,并且焊接到壳体200的底表面,以电连接第一电极11和壳体200。相应地,连接到第一电极接线片14的壳体200具有与第一电极11相同的极性。
第二电极12包括电极活性区域和未涂敷活性物质的电极未涂覆区域,在电极活性区域处活性物质被涂敷在长条带形状的金属箔形成的薄板上,并且第二电极接线片15可连接到电极未涂覆区域。
电极未涂覆区域可形成在相对于电极活性部分的相反端处,即,第二电极12的长度方向上的两端处,但不限于此,并且可形成在一端处。
第二电极接线片15可连接到第二电极12的电极未涂覆区域,并且第二电极接线片15可从第二电极12突出,以电连接到电极端子400。第二电极接线片15由诸如镍或铜的导电材料制成,并且可通过焊接连接到电极未涂覆区域。在这种情况下,焊接可以是激光焊接。
第二电极12可以是正电极,并且在电极活性区域中,诸如过渡金属氧化物的活性物质可被涂覆在诸如铝的金属箔上。
第二电极接线片15电连接到电极组件100的第二电极12的电极未涂覆区域,从电极组件100突出,并且焊接到电极端子400的下表面,以电连接第二电极12和电极端子400。通过第二电极接线片15,电极端子400具有与第二电极12相同的极性。
隔板13位于第一电极11与第二电极12之间,并且用于防止它们之间的短路并使锂离子能够移动。隔板13可由例如聚乙烯、聚丙烯、聚乙烯和聚丙烯的复合膜制成。
隔板13的宽度可等于或大于第一电极11和第二电极12的宽度,并且第一电极11的宽度可大于第二电极12的宽度。在这种情况下,宽度是在电极组件插入壳体中所沿的方向上的长度。
由于隔板13的长度相对地大于第一电极11和第二电极12的长度,因此隔板13可与壳体200的内底表面直接接触。
以这种方式,隔板13的宽度被形成为大于第一电极11或第二电极12的宽度,从而即使单独的绝缘构件或绝缘板没有位于电极组件100与壳体200的内底表面之间,也可防止具有不同极性的壳体200的电连接到第一电极11的内底表面和第二电极的端部彼此接触而短路。
此外,当发生隔板13的未对准时,具有相对大的宽度的第一电极11可从隔板13突出。第一电极11通过第一电极接线片14电连接到壳体200,即使第一电极11从隔板13突出并与壳体200接触,由于它们具有相同的极性,也不会发生短路现象。
电极组件100可通过在第一电极11、隔板13和第二电极12重叠的状态下围绕旋转轴线卷绕而具有果冻卷形状,但不限于此,并且电极组件100可具有片型的第一电极、隔板和第二电极反复地堆叠的结构(未示出)。
电极组件100可通过绝缘带600绝缘,而不接触壳体200的内表面。
绝缘带600包括附接到第二电极接线片15的第一带61和围绕电极组件100的第二带62。
第一带61可从第二电极接线片15附接到第二电极的电极未涂覆区域处的一端延伸到第二电极接线片15附接到电极端子400处的另一端(参考图3),并且可以以比第二电极接线片15宽阔的面积附接到第二电极接线片15的下表面。
第一带61防止第二电极接线片15的下表面与第一电极的可能暴露于电极组件100的上部的端部接触和短路。
第二带62沿电极组件100的直径方向外周表面附接,以覆盖电极组件100的外侧。第二带62在保护电极组件100的外侧的同时在电极组件100的外周表面与壳体200的内表面之间电绝缘。
绝缘垫圈63可进一步安装在第二引线接线片15的上表面与盖板300之间,以防止第二引线接线片15或第二电极12与盖板300的下表面彼此接触和短路。
绝缘垫圈63与电极组件100的边缘重叠,并位于第二电极接线片15的朝向盖板300暴露的上表面上。由于电极端子400连接到第二引线接线片15,因此可移除绝缘垫圈63的与电极端子400对应的中心部分,以暴露电极组件的中心(或中心销)。
此外,在电极组件100的邻近盖板300的一侧上,可进一步安装绝缘盘64,以防止第一电极11的端部与电极端子400通过彼此接触而短路。绝缘盘64可与电极组件100的大部分顶表面重叠。
沿竖直方向穿过电极组件100的中心的中心销50可定位在电极组件100的中心,并且中心销可支撑第一电极接线片14和第二电极接线片15。
壳体200具有容纳电极组件100和电解质溶液的空间,具有一侧敞开的开口21,并且电极组件100通过开口21插入以被容纳在壳体200的内部空间中。壳体200可呈具有低的高度的圆柱形状,但不限于此,并且可具有各种众所周知的形状。壳体200可容纳多种已知的电解质溶液以及电极组件100,并且壳体200可由不锈钢制成。
壳体200的内底表面通过第一电极接线片14连接到电极组件100的第一电极11,并且壳体200具有与第一电极11相同的极性。
壳体200的外表面可以是可再充电电池1000的第一电极端子,并且电极端子400的外表面可以是可再充电电池1000的第二电极端子。
封闭和密封壳体200的内部空间的盖板300和电极端子400可联接到壳体200的开口21,并且盖板300可通过焊接联接到开口21。
盖板300被以与开口21对应的形状形成,并且台阶部30可形成在开口21中,使得盖板300可以容易地坐落。
端子孔31形成在盖板300的中心,并且端子孔31与电极组件100的中心对应并暴露电极组件100的上部。由于形成在中心的端子孔31,所以盖板300呈环形。
盖板300与壳体200结合,并具有与第一电极11相同的极性,并且盖板300的外表面可以是可再充电电池1000的第一电极端子。盖板300包含不锈钢,但不限于此,并且可包含诸如铝、镍和铜的金属。
电极端子400可在其与不同极性的盖板300绝缘的状态下被结合,并且穿过盖板300的端子孔31电连接到电极组件的第二电极12。因此,电极端子400可以是可再充电电池1000的第二电极端子。
电极端子400可包含不锈钢,但不限于此,并且电极端子400可包含诸如铝、镍和铜的金属。
壳体200和盖板300可连接到为负电极的第一电极11,使得第一电极端子是负极端子,并且电极端子400电连接到为正电极的第二电极12,使得第二电极端子可以是正极端子。
同时,电极端子400包括凸缘部41和突出部42,凸缘部41可具有比突出部42大的面积(或直径),并且凸缘部41具有比突出部42小的厚度。突出部42和凸缘部41可整体形成。
电极端子400的突出部42插入端子孔31中,并与凸缘部41一起覆盖盖板300的端子孔31,以密封壳体200的内部。电极端子400的突出部42电连接到电极组件100的第二电极接线片15,于是电极端子400具有与第二电极12相同的极性。凸缘部41的外表面可以是可再充电电池1000的第二电极端子。
图4是示出图2的部分A的截面图。
参考图4,突出部42的外表面包括曲面CS和斜面IS。突出部42包括从凸缘部41的下表面延伸的曲面CS以及从曲面CS延伸并穿过端子孔31的斜面IS。
曲面CS可具有预定的曲率半径,并且斜面IS可具有预定的倾斜度。相应地,突出部42的表面从曲面CS朝向斜面IS的端部远离盖板300的通过端子孔31暴露的端部。以此方式,如果形成倾面IS,则突出部42的沿水平方向位于盖板300与电极端子400之间的距离增加,并且即使发生对准误差,也能抑制不同极性的盖板300与突出部42之间的短路的发生。
再次参考图1和图2,电极端子400的凸缘部41的下表面可通过热熔层500附接到盖板300的一个表面。通过在盖板300与电极端子400之间结合热熔层500,容纳电极组件100的壳体200的开口21被盖板300、电极端子400和热熔层500完全密封。
热熔层500可通过使用热或激光束热熔合在盖板300与电极端子400的凸缘部41之间。
热熔层500由绝缘材料制成,以在电极端子400与盖板300之间绝缘。热熔层500可包含用于在盖板300与电极端子400之间绝缘和结合的各种已知材料。
热熔层500通过热量固化,并且可在预定温度下熔化。这里,热熔层500熔化的预定温度可以是超过热熔层500的热固化温度的温度,但不限于此。
例如,热熔层500可包括热固性树脂和热塑性树脂。热熔层500的热固性树脂和热塑性树脂可以以多个层堆叠,但本发明不限于此。热熔层500的热固性树脂通过热量固化,并且可包括各种已知的热固性树脂,诸如酚树脂、尿素树脂、三聚氰胺树脂、环氧树脂和聚酯树脂。热熔层500的热塑性树脂包括在预定温度下熔化的聚丙烯树脂,但不限于此,并且可包括各种已知的热塑性树脂,诸如聚苯乙烯、聚乙烯和聚氯乙烯树脂。
如此,热熔层500在预定温度下熔化,并且移除热熔层500的部分变成排出气体的通风通道。
当在可再充电电池1000的内部空间中发生意外事件(两个电极的短路等)时,温度升高,热熔层500由于升高的温度而熔化,并且体积减小,并且形成可再充电电池内部产生的气体GA排出到外部的通风通道。内部气体从可再充电电池1000的内部空间沿着电极端子400的曲面CS被引导到凸缘部41与盖板300之间的作为通风通道的空间,并被迅速地排出到外部,由此可抑制可再充电电池1000的爆炸风险。
图5是示出根据本发明的另一示例性实施例的可再充电电池的截面图,并且图6是图5的部分B的截面图。
图5和图6中示出的根据本发明的另一示例性实施例的可再充电电池1002与图1至图3的可再充电电池大部分相同,因此仅详细描述其它部分。
参考图5,根据本发明的另一示例性实施例的可再充电电池1002包括电极组件100、壳体200、盖板300、电极端子400和热熔层500。
电极端子400电连接到第二电极12,并通过热熔层500绝缘并结合到盖板300。电极端子400覆盖盖板300的端子孔31。电极端子400位于盖板300与电极组件100之间。
电极端子400覆盖壳体200的开口21的中心区域,盖板300的端子孔31通过该中心区域暴露。由于电极端子400覆盖开口21的中心区域并且盖板300覆盖开口21的外部区域,因此壳体200的开口21被电极端子400和盖板300完全密封。电极端子400连接到电极组件100的第二电极接线片15,并且电连接到电极组件100的第二电极12。
电极端子400包括凸缘部41和突出部42。凸缘部41位于盖板300与壳体200中的电极组件100之间,并且与盖板300重叠,以覆盖端子孔31。
凸缘部41的上表面与热熔层500接触,并且凸缘部41通过热熔层500绝缘并接合到盖板300。凸缘部41的下表面电连接到第二电极接线片15。由于凸缘部41连接到第二电极接线片15,因此电极端子400的突出部42和凸缘部41具有与第二电极12相同的极性。
突出部42穿过端子孔31并暴露在壳体200的外部。突出部42的外表面可以是可再充电电池1002的第二电极端子。
突出部42的外表面可位于与盖板300的外表面相同的平面上或与盖板300的外表面不同的平面上。例如,突出部42的外表面的高度可与盖板300的外表面的高度相同,但不限于此,并且突出部42的外表面的高度可高于或低于盖板300的外表面的高度。
突出部42的外侧包括曲面CS和斜面IS。
突出部42包括从凸缘部41的下表面延伸的曲面CS以及从曲面CS延伸并穿过端子孔31的斜面IS。
曲面CS可具有预定的曲率半径,并且斜面IS可具有预定的倾斜度。因此,突出部42的表面从曲面CS朝向斜面IS的端部远离为端子孔31的边缘的盖板300。以此方式,如果形成斜面IS,则突出部42的沿水平方向位于盖板300与电极端子400之间的距离增加,并且即使发生对准误差,也能抑制不同极性的盖板300与突出部42之间的短路的发生。
以此方式,当凸缘部41通过壳体200内的热熔部500连接时,如果壳体200内的温度由于事件的发生而升高并且热熔部500熔化,则凸缘部41与盖板300分离并沿重力方向移动,使得端子孔31可打开。因此,可通过将内部气体比图1中更快地排出到外部来防止爆炸。
虽然已经结合目前被认为是实践示例性实施例的实施例描述了本发明,但是应当理解,本发明不限于所公开的实施例。相反,本发明旨在涵盖包括在所附权利要求的范围内的各种修改和等同布置。
标号说明:
11:第一电极 12:第二电极
13:隔板 30:台阶部
41:凸缘部 42:突出部
100:电极组件 200:壳体
300:盖板 400:电极端子
500:热熔层
Claims (10)
1.一种可再充电电池,包括:
电极组件,包括第一电极、第二电极以及位于所述第一电极与所述第二电极之间的隔板;
壳体,具有容纳所述电极组件的内部空间以及带有一个敞开侧的开口;
盖板,联接到所述壳体的所述开口,并且具有暴露所述内部空间的端子孔;和
电极端子,穿过所述端子孔电连接到所述电极组件,并且与所述盖板重叠,
其中,所述隔板具有比所述第一电极和所述第二电极大的宽度,并且所述隔板与所述壳体的内底表面接触。
2.根据权利要求1所述的可再充电电池,进一步包括:
第一电极接线片,将所述第一电极和所述壳体的所述内底表面电连接;和
第二电极接线片,将所述第二电极和所述电极端子电连接。
3.根据权利要求2所述的可再充电电池,进一步包括:
第一带,以比所述第二电极接线片大的面积附接到所述第二电极接线片的下表面,以在所述第二电极接线片与所述电极组件之间绝缘;和
第二带,沿所述电极组件的直径方向外周表面附接,并且围绕所述电极组件的外侧包裹,以在所述电极组件的外侧与所述壳体的内侧之间绝缘。
4.根据权利要求2所述的可再充电电池,进一步包括:
绝缘盘,位于所述第二电极接线片与所述电极组件的顶表面之间,并且在所述电极端子与所述电极组件之间绝缘。
5.根据权利要求2所述的可再充电电池,进一步包括:
绝缘垫圈,位于所述第二电极接线片与所述盖板之间,并且在所述第二电极接线片与所述盖板之间绝缘,
其中,所述绝缘垫圈具有对应于所述电极端子移除的部分。
6.根据权利要求1所述的可再充电电池,其中:
所述盖板被焊接到所述壳体,并且
所述盖板和所述壳体由相同的金属制成。
7.根据权利要求1所述的可再充电电池,其中:
所述电极端子包括:
凸缘部,覆盖所述端子孔并且与所述盖板重叠;和
突出部,与所述凸缘部整体形成,并且从所述凸缘部朝向所述端子孔突出。
8.根据权利要求7所述的可再充电电池,其中:
所述突出部的外侧具有曲面和斜面,从所述曲面到所述盖板的暴露于所述端子孔的端部的距离比从所述斜面到所述盖板的暴露于所述端子孔的端部的距离短,并且
从所述盖板的暴露于所述端子孔的端部朝向所述斜面的端部的距离变长。
9.根据权利要求1所述的可再充电电池,进一步包括:
热熔层,位于所述盖板与所述凸缘部之间,并且绝缘结合在所述盖板与所述凸缘部之间。
10.根据权利要求9所述的可再充电电池,其中,所述热熔层在预定温度下熔化。
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KR1020200081159A KR20220003396A (ko) | 2020-07-01 | 2020-07-01 | 이차 전지 |
PCT/KR2021/002867 WO2022004987A1 (ko) | 2020-07-01 | 2021-03-09 | 이차 전지 |
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EP (1) | EP4177994A1 (zh) |
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WO2024065458A1 (zh) * | 2022-09-29 | 2024-04-04 | 宁德新能源科技有限公司 | 电化学装置及用电设备 |
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KR20060118955A (ko) * | 2005-05-18 | 2006-11-24 | 삼성에스디아이 주식회사 | 권취형 전극 조립체 및 이를 구비하는 리튬 이차 전지 |
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- 2020-07-01 KR KR1020200081159A patent/KR20220003396A/ko unknown
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2021
- 2021-03-09 EP EP21831707.1A patent/EP4177994A1/en active Pending
- 2021-03-09 CN CN202180006283.9A patent/CN114641881A/zh active Pending
- 2021-03-09 WO PCT/KR2021/002867 patent/WO2022004987A1/ko unknown
- 2021-03-09 US US17/922,952 patent/US20230170593A1/en active Pending
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KR19980062215U (ko) * | 1997-03-31 | 1998-11-16 | 손욱 | 각형 이차 전지 |
US20040038126A1 (en) * | 2002-08-20 | 2004-02-26 | Samsung Sdi Co., Ltd | Pouch type secondary battery with safety vent |
KR100686859B1 (ko) * | 2005-09-28 | 2007-02-26 | 삼성에스디아이 주식회사 | 이차 전지 |
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WO2024065458A1 (zh) * | 2022-09-29 | 2024-04-04 | 宁德新能源科技有限公司 | 电化学装置及用电设备 |
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WO2022004987A1 (ko) | 2022-01-06 |
US20230170593A1 (en) | 2023-06-01 |
KR20220003396A (ko) | 2022-01-10 |
EP4177994A1 (en) | 2023-05-10 |
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