技术领域Technical Field
本申请涉及电化学技术领域，特别是涉及一种电化学装置及用电设备。The present application relates to the field of electrochemical technology, and in particular to an electrochemical device and electrical equipment.
背景技术Background technique
以锂离子电池为例的电化学装置因其具有高循环稳定性、高安全性以及低维护等特性，被广泛地应用于笔记本电脑、智能手机和平板电脑等消费类电子产品中。但随着消费类电子产品朝着智能化、轻薄化、便携化、多功能化、高性能等方向发展，对为消费类电子产品供能的锂离子电池也提出了更为严苛地要求，例如，要求锂离子电池必须具有更高的能量密度和更大的容量。Electrochemical devices such as lithium-ion batteries are widely used in consumer electronic products such as laptops, smartphones and tablets due to their high cycle stability, high safety and low maintenance. However, as consumer electronic products develop towards intelligence, lightness, portability, multi-functions and high performance, more stringent requirements are also put forward for lithium-ion batteries that power consumer electronic products, for example, lithium-ion batteries must have higher energy density and larger capacity.
现在，消费类电子产品大多具有便携性，在日常使用过程中难免会出现跌落的情形，而前述情形掉落地面时对锂离子电池施加的外部撞击导致收容于壳体内的电极组件产生相对移动，造成因电极组件的隔离膜缩进正负极片之间的间隙而正负极片直接接触的问题。特别地，电极组件的顶部和底部较易地发生破损变形，因而正负极片直接接触的问题通常发生在电极组件的顶部或底部。Nowadays, most consumer electronic products are portable and inevitably fall during daily use. When the lithium-ion battery falls to the ground, the external impact on the lithium-ion battery causes the electrode assembly contained in the housing to move relative to each other, resulting in the problem of direct contact between the positive and negative electrodes due to the indentation of the separator of the electrode assembly into the gap between the positive and negative electrodes. In particular, the top and bottom of the electrode assembly are more likely to be damaged and deformed, so the problem of direct contact between the positive and negative electrodes usually occurs at the top or bottom of the electrode assembly.
发明人在实现本申请的过程中，发现：为改善隔离膜收缩的问题，通常会在电极组件的顶部或底部进行绕胶处理，但由于隔离膜的宽度大于正负极片的宽度，即使电极组件绕胶处理过，仍然对隔离膜伸出电极组件的部分束缚效果不佳，跌落时仍存在隔离膜收缩的情况。In the process of realizing the present application, the inventors found that in order to improve the problem of isolation membrane shrinkage, glue wrapping is usually performed on the top or bottom of the electrode assembly. However, since the width of the isolation membrane is greater than the width of the positive and negative electrode sheets, even if the electrode assembly is wrapped with glue, the restraint effect on the part of the isolation membrane extending out of the electrode assembly is still poor, and the isolation membrane still shrinks when it falls.
发明内容Summary of the invention
本申请实施例的目的在于提供一种电化学装置及用电设备，旨在改善锂离子电池掉落地面上时对隔离膜施加的外部撞击而产生的隔离膜收缩的问题。The purpose of the embodiments of the present application is to provide an electrochemical device and an electrical equipment, aiming to improve the problem of shrinkage of the isolation membrane caused by external impact on the isolation membrane when a lithium-ion battery falls to the ground.
为解决上述技术问题，本申请实施方式采用的一个技术方案是：提供一种电化学装置，包括电极组件。所述电极组件包括沿第一方向堆叠的第一极片、隔离膜以及第二极片。所述电极组件在第二方向上具有第一端部与第二端部。所述第二方向垂直于所述第一方向。所述隔离膜包括第一延长部。所述第一延长部从所述第一端部伸出所述电极组件外，并且所述第一延长部连接于所述电极组件的外表面。通过第一延长部伸出电极组件外并连接于电极组件的外表面，第一极片和/或第二极片与隔离膜共同组成用于抵消因锂离子电池掉落地面上时电池外壳对隔离膜施加的作用力的电极组件，改善了隔离膜受到外部撞击时而产生隔离膜收缩的问题。In order to solve the above technical problems, a technical solution adopted in the embodiment of the present application is: to provide an electrochemical device, including an electrode assembly. The electrode assembly includes a first pole piece, a separator and a second pole piece stacked along a first direction. The electrode assembly has a first end and a second end in a second direction. The second direction is perpendicular to the first direction. The separator includes a first extension. The first extension extends out of the electrode assembly from the first end, and the first extension is connected to the outer surface of the electrode assembly. With the first extension extending out of the electrode assembly and connected to the outer surface of the electrode assembly, the first pole piece and/or the second pole piece and the separator together constitute an electrode assembly for offsetting the force exerted on the separator by the battery casing when the lithium-ion battery falls on the ground, thereby improving the problem of shrinkage of the separator when the separator is subjected to external impact.
在可能的实施例中，所述第一延长部围绕所述电极组件的外表面至少一圈。如此设置，提高了电极组件的结构整体性，有利于提升电极组件的抗冲击性能。In a possible embodiment, the first extension portion surrounds the outer surface of the electrode assembly for at least one circle. This arrangement improves the structural integrity of the electrode assembly and is conducive to improving the impact resistance of the electrode assembly.
在可能的实施例中，所述电化学装置还包括连接件。所述连接件被配置为将所述第一延长部固定于所述电极组件的外表面。如此设置，减少了第一延长部脱离电极组件的外表面的情况发生。In a possible embodiment, the electrochemical device further comprises a connector. The connector is configured to fix the first extension portion to the outer surface of the electrode assembly. Such a configuration reduces the occurrence of the first extension portion being separated from the outer surface of the electrode assembly.
在可能的实施例中，所述连接件为双面胶纸或单面胶纸中的至少一个。采用双面胶纸或单面胶纸可方便地将第一延长部固定于电极组件的外表面。In a possible embodiment, the connecting member is at least one of double-sided adhesive tape or single-sided adhesive tape. The first extension portion can be conveniently fixed to the outer surface of the electrode assembly by using double-sided adhesive tape or single-sided adhesive tape.
在可能的实施例中，所述隔离膜还包括第二延长部。所述第二延长部自所述电极组件伸出所述电极组件外，并且所述第二延长部固定于所述电极组件的外表面。第二延长部与第一延长部可分别固定于电极组件的外表面，提高了电极组件的结构整体性，有利于提升电极组件的抗冲击性能。In a possible embodiment, the isolation film further includes a second extension portion. The second extension portion extends from the electrode assembly outside the electrode assembly, and the second extension portion is fixed to the outer surface of the electrode assembly. The second extension portion and the first extension portion can be fixed to the outer surface of the electrode assembly respectively, which improves the structural integrity of the electrode assembly and is conducive to improving the impact resistance of the electrode assembly.
在可能的实施例方式中，所述第一延长部和所述第二延长部沿所述第一方向间隔设置。即第一延长部与第二延长部从隔离膜的同一端伸出固定于电极组件的外表面。相较于第一延长部的固定来说，隔离膜受到冲击后，可进一步地降低隔离膜受到冲击后的收缩程度。In a possible embodiment, the first extension portion and the second extension portion are spaced apart along the first direction. That is, the first extension portion and the second extension portion extend from the same end of the isolation membrane and are fixed to the outer surface of the electrode assembly. Compared with the fixation of the first extension portion, the shrinkage degree of the isolation membrane after the impact can be further reduced after the impact.
在可能的实施例中，所述第一延长部和所述第二延长部沿所述第二方向间隔设置。即第一延长部与第二延长部从隔离膜的两端伸出固定于电极组件的外表面。相较于第一延长部的固定来说，隔离膜受到冲击后，可进一步地的降低隔离膜受到冲击后的收缩程度。In a possible embodiment, the first extension portion and the second extension portion are spaced apart along the second direction. That is, the first extension portion and the second extension portion extend from both ends of the isolation membrane and are fixed to the outer surface of the electrode assembly. Compared with the fixation of the first extension portion, the shrinkage degree of the isolation membrane after the impact can be further reduced after the impact.
在可能的实施例中，所述第一延长部和所述第二延长部各自独立的设置在所述电极组件的第一端部或者第二端部。即第一延长部与第二延长部间隔设置于隔离膜的一端。相较于第一延长部的固定来说，在保证电极组件具有较好地的抗冲击性同时，也减少了电极组件的厚度。In a possible embodiment, the first extension portion and the second extension portion are independently arranged at the first end portion or the second end portion of the electrode assembly. That is, the first extension portion and the second extension portion are arranged at one end of the isolation membrane. Compared with the fixing of the first extension portion, while ensuring that the electrode assembly has better impact resistance, the thickness of the electrode assembly is also reduced.
在可能的实施例中，所述第一延长部和所述第二延长部设置在所述电极组件的第一端部。且所述第一延长部沿所述第一方向弯折，所述第二延长部沿与所述第一方向相反的方向弯折。In a possible embodiment, the first extension portion and the second extension portion are disposed at the first end portion of the electrode assembly, and the first extension portion is bent along the first direction, and the second extension portion is bent along a direction opposite to the first direction.
在可能的实施例中，沿所述第一方向，所述第一延长部和所述第二延长部各自独立地设置为与所述电极组件的最外圈相邻。In a possible embodiment, along the first direction, the first extension portion and the second extension portion are each independently arranged to be adjacent to the outermost circle of the electrode assembly.
在可能的实施例中，所述电极组件还包括第一极耳与第二极耳。所述第一极耳与所述电化学装置的正极连接。所述第二极耳与电化学装置的负极连接。所述第一极耳与所述第二极耳沿第三方向间隔设置。其中，所述第一延长部处于所述第一极耳与所述第二极耳之间。In a possible embodiment, the electrode assembly further includes a first pole tab and a second pole tab. The first pole tab is connected to the positive electrode of the electrochemical device. The second pole tab is connected to the negative electrode of the electrochemical device. The first pole tab and the second pole tab are arranged at intervals along the third direction. The first extension portion is located between the first pole tab and the second pole tab.
在可能的实施例中，所述隔离膜还包括隔离膜主体。所述第一延长部与所述隔离膜主体一体成型。减少了第一延长部从第一延长部与隔离膜主体的连接处脱离的情况发生。In a possible embodiment, the isolation membrane further comprises an isolation membrane body, and the first extension portion is integrally formed with the isolation membrane body, thereby reducing the possibility of the first extension portion being detached from the connection between the first extension portion and the isolation membrane body.
本申请实施例采用的另一个技术方案是：提供一种用电设备，包括负载和如上述的任意一种电化学装置，所述负载与所述电化学装置电连接。Another technical solution adopted in the embodiment of the present application is: to provide an electrical equipment, including a load and any one of the electrochemical devices as described above, wherein the load is electrically connected to the electrochemical device.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
为了更清楚地说明本申请实施例的技术方案，下面将对本申请实施例中所需要使用的附图作简单地介绍，显而易见地，下面所描述的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据附图获得其他的附图。In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.
图1为本申请其中一实施例提供的一种电化学装置的结构示意图；FIG1 is a schematic structural diagram of an electrochemical device provided in one embodiment of the present application;
图2为图1所示的电化学装置的电极组件收容于壳体的结构示意图；FIG2 is a schematic diagram of the structure of the electrode assembly of the electrochemical device shown in FIG1 being accommodated in a housing;
图3为图2所示的电极组件中的第一端部的截面示意图；FIG3 is a cross-sectional schematic diagram of a first end portion of the electrode assembly shown in FIG2 ;
图4为图2所示的电极组件中的第二端部的截面示意图；FIG4 is a schematic cross-sectional view of a second end portion of the electrode assembly shown in FIG2 ;
图5为本申请另一实施例提供的一种电化学装置的电极组件的结构示意图；FIG5 is a schematic structural diagram of an electrode assembly of an electrochemical device provided in another embodiment of the present application;
图6为图2所示的电极组件、第一延长部与第二延长部三者之间的连接方式的示意图；FIG6 is a schematic diagram of a connection method among the electrode assembly, the first extension portion and the second extension portion shown in FIG2 ;
图7为图2所示的另一电极组件中的隔离膜具有多个第一延长部的结构示意图；FIG7 is a schematic structural diagram of a separator in another electrode assembly shown in FIG2 having a plurality of first extension portions;
图8为图6所示的电极组件、第一延长部与第二延长部三者之间另一连接方式的示意图；FIG8 is a schematic diagram of another connection method between the electrode assembly, the first extension portion and the second extension portion shown in FIG6;
图9为图3所示的第一延长部与隔离膜主体之间的连接方式的示意图；FIG9 is a schematic diagram of a connection method between the first extension portion and the isolation membrane body shown in FIG3 ;
图10为图3所示的另一种第一延长部与隔离膜主体之间的连接方式的示意图。FIG. 10 is a schematic diagram of another connection method between the first extension portion and the isolation membrane body shown in FIG. 3 .
具体实施方式Detailed ways
为了便于理解本申请，下面结合附图和具体实施例，对本申请进行更详细的说明。需要说明的是，当元件被表述“固定于”/“固接于”另一个元件，它可以直接在另一个元件上、或者其间可以存在一个或多个居中的元件。当一个元件被表述“连接”另一个元件，它可以是直接连接到另一个元件、或者其间可以存在一个或多个居中的元件。本说明书所使用的术语“垂直的”、“水平的”、“左”、“右”、“内”、“外”以及类似的表述只是为了说明的目的。In order to facilitate the understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to"/"fixed to" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween. The terms "vertical", "horizontal", "left", "right", "inside", "outside" and similar expressions used in this specification are for illustrative purposes only.
除非另有定义，本说明书所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同。在本申请的说明书中所使用的术语只是为了描述具体的实施例的目的，不是用于限制本申请。本说明书所使用的术语“和/或”包括一个或多个相关的所列项目的任意的和所有的组合。Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and/or" used in this specification includes any and all combinations of one or more of the related listed items.
此外，下面所描述的本申请不同实施例中所涉及的技术特征只要彼此之间未构成冲突就可以相互结合。In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.
请参阅图1与图2，为本申请实施例提供的一种电化学装置，包括壳体10、电极组件20以及电解液(图未示)，电解液收容于壳体10内，电极组件20浸润于电解液中。其中，电极组件20包括第一极片21、隔离膜22以及第二极片23，隔离膜22设置于第一极片21与第二极片23之间，以使第一极片21与第二极片23相间隔。接下来，依次对上述壳体10与电极组件20的具体结构作出说明。Please refer to FIG. 1 and FIG. 2, which are an electrochemical device provided in an embodiment of the present application, including a housing 10, an electrode assembly 20 and an electrolyte (not shown), wherein the electrolyte is contained in the housing 10, and the electrode assembly 20 is immersed in the electrolyte. The electrode assembly 20 includes a first pole piece 21, a separator 22 and a second pole piece 23, wherein the separator 22 is disposed between the first pole piece 21 and the second pole piece 23 to separate the first pole piece 21 and the second pole piece 23. Next, the specific structures of the housing 10 and the electrode assembly 20 are described in turn.
对于上述的壳体10，请继续参阅图1，壳体10大致呈扁平地六面体状，其内部设有收容腔(图未示)，该收容腔用于收容上述电极组件20以及电解液。在此需要指出的是，壳体10是由金属材料制成的。一方面，金属能够隔绝湿气渗入壳体10内，从而防止电解液中电解质沿Li PF6水解呈氢氟酸(HF)。另一方面，金属也阻断了溶剂从壳体10内通过扩散泄露到壳体10外。例如，壳体10为硬质壳体10，其通常是由铝合金、不锈钢、钛合金镁合金材料中的一种或几种制成的。又例如，壳体10为软包壳体10，其通常是由多层高抛光铝塑膜层叠而成的。For the above-mentioned shell 10, please continue to refer to Figure 1. The shell 10 is roughly in the shape of a flat hexahedron, and a receiving cavity (not shown) is provided inside it, which is used to receive the above-mentioned electrode assembly 20 and the electrolyte. It should be pointed out here that the shell 10 is made of metal material. On the one hand, the metal can isolate moisture from penetrating into the shell 10, thereby preventing the electrolyte in the electrolyte from being hydrolyzed alongLiPF6 to hydrofluoric acid (HF). On the other hand, the metal also blocks the solvent from leaking from the shell 10 to the outside of the shell 10 through diffusion. For example, the shell 10 is a hard shell 10, which is usually made of one or more of aluminum alloy, stainless steel, titanium alloy and magnesium alloy materials. For another example, the shell 10 is a soft package shell 10, which is usually stacked by multiple layers of high-polished aluminum-plastic film.
应当理解的是，在本申请实施例中，壳体10的形状不限于此。由于壳体10的具体形状取决于电极组件20卷绕或层叠后所形成的形状，因而电极组件20以圆柱形卷绕时，壳体10的形状亦为圆柱形，或者，电极组件20以方形叠片时，壳体10的形状亦为方形。It should be understood that in the embodiment of the present application, the shape of the housing 10 is not limited thereto. Since the specific shape of the housing 10 depends on the shape formed after the electrode assembly 20 is wound or stacked, when the electrode assembly 20 is wound in a cylindrical shape, the shape of the housing 10 is also cylindrical, or when the electrode assembly 20 is stacked in a square shape, the shape of the housing 10 is also square.
对于上述的电极组件20，请一并结合图3与图4，继续参阅图2，该电极组件20收容于上述收容腔，其包括间隔设置的第一极片21、第二极片23以及设置于两者之间并用于分隔两者的隔离膜22。该第一极片21与第二极片23的极性相反，两者中的一个为正极片，另一个为负极片。该第一极片21、第二极片23以及隔离膜22堆叠设置并卷绕成截面呈腰圆形的柱状结构，以便收容于上述收容腔。应当理解的是，即使本申请实施例中以电极组件20为截面呈腰圆形的柱状结构为例作出说明，但考虑到电极组件20卷绕形式的多样性，以及电极组件20在电化学装置的使用过程中容易发生形变，故本申请实施例并不对电极组件20的形状作出具体限定。For the above-mentioned electrode assembly 20, please refer to Figure 2 in conjunction with Figures 3 and 4. The electrode assembly 20 is accommodated in the above-mentioned accommodation cavity, and includes a first pole piece 21, a second pole piece 23 arranged at intervals, and a separator 22 arranged between the two and used to separate the two. The polarity of the first pole piece 21 and the second pole piece 23 is opposite, one of the two is a positive pole piece, and the other is a negative pole piece. The first pole piece 21, the second pole piece 23 and the separator 22 are stacked and wound into a columnar structure with a round cross section so as to be accommodated in the above-mentioned accommodation cavity. It should be understood that even if the electrode assembly 20 is an example of a columnar structure with a round cross section in the present application, considering the diversity of the winding form of the electrode assembly 20 and the fact that the electrode assembly 20 is easily deformed during the use of the electrochemical device, the present application embodiment does not specifically limit the shape of the electrode assembly 20.
还应当理解的是，本申请实施例中的电极组件20类型不限于此。例如如图5所示的采用方形叠片的叠置方式形成的叠片式电极组件20，或者以圆柱卷绕的卷绕方式形成的卷绕式电极组件20等。针对不同类型的电极组件20，极耳可由电极组件20的任意位置延伸而出，例如，极耳从卷绕式电极组件20一端部或者从叠片式电极组件20任意一个或多个侧边伸出。也就是说，本申请实施例仅以方形平卷式电极组件20为例说明，并不对本申请构成任何限定。It should also be understood that the type of electrode assembly 20 in the embodiment of the present application is not limited thereto. For example, a laminated electrode assembly 20 formed by stacking square laminates as shown in FIG. 5 , or a wound electrode assembly 20 formed by winding a cylindrical winding, etc. For different types of electrode assemblies 20 , the pole ear may extend from any position of the electrode assembly 20 , for example, the pole ear extends from one end of the wound electrode assembly 20 or from any one or more sides of the laminated electrode assembly 20 . In other words, the embodiment of the present application is only illustrated by taking the square flat-rolled electrode assembly 20 as an example, and does not constitute any limitation to the present application.
接下来对上述的第一极片21、第二极片23以及隔离膜22的具体结构作出说明。Next, the specific structures of the first pole piece 21 , the second pole piece 23 and the isolation film 22 are described.
对于前述的第一极片21，第一极片21整体呈长条带状结构，其包括第一集流体和形成在第一集流体表面的第一活性物质基层。其中，第一集流体是由具有良导电率的薄金属板材制成的，例如铝箔。第一活性物质基层是由第一活性物质被涂覆在第一集流体的涂覆区而形成的，第一活性物质可以包括正极活性物质、导电剂和粘合剂。硫族化合物可用作正极活性物质。例如，复合金属氧化物，例如LiCoO2、LiMn2O4、Li Ni2O4、Li Ni1-XCoxO2(0＜x＜1)或LiMn2O4可以用作正极活性物质。当然了，正极活性物质不限于这些物质。For the aforementioned first pole piece 21, the first pole piece 21 is in a long strip-shaped structure as a whole, which includes a first current collector and a first active material base layer formed on the surface of the first current collector. Among them, the first current collector is made of a thin metal plate with good conductivity, such as aluminum foil. The first active material base layer is formed by coating the first active material on the coating area of the first current collector, and the first active material may include a positive electrode active material, a conductive agent and a binder. Sulfide compounds can be used as positive electrode active materials. For example, composite metal oxides, such as LiCoO2 , LiMn2 O4 , Li Ni2 O4 , Li Ni1-X Cox O2 (0＜x＜1) or LiMn2 O4 can be used as positive electrode active materials. Of course, the positive electrode active material is not limited to these substances.
对于前述的第二极片23，与第一极片21相似，第二极片23整体呈长条带状结构，其包括第二集流体和形成在第二集流体表面的第二活性物质基层。其中，第二集流体是由导电金属板材制成的，例如铜箔或镍箔，第二活性物质基层可以包括负极活性物质、导电剂和粘合剂。负极活性物质可以选用自由碳物质、Si、Sn、氧化锡、复合锡合金、过渡金属氧化物、锂金属氮化物和锂金属氧化物组成的组。当然了，负极活性物质不限于这些物质。For the aforementioned second pole piece 23, similar to the first pole piece 21, the second pole piece 23 is an overall long strip structure, which includes a second current collector and a second active material base layer formed on the surface of the second current collector. Among them, the second current collector is made of a conductive metal sheet, such as copper foil or nickel foil, and the second active material base layer may include a negative electrode active material, a conductive agent and an adhesive. The negative electrode active material can be selected from a group consisting of free carbon materials, Si, Sn, tin oxide, composite tin alloys, transition metal oxides, lithium metal nitrides and lithium metal oxides. Of course, the negative electrode active material is not limited to these substances.
对于前述的隔离膜22，请继续参阅图3或图4，隔离膜22包括隔离膜主体221与第一延长部222。隔离膜主体221整体呈长条带状结构，第一延长部222自隔离膜主体221伸出电极组件20外，并且第一延长部222连接于电极组件20的外表面。隔离膜主体221用于防止第一极片21和第二极片23之间发生短路，同时仅允许电化学装置的锂离子通过。其中，隔离膜22可以选自由聚乙烯、聚丙烯、以及聚乙烯与聚丙烯的共聚物组成的组。当然了，隔离膜22不限于这些物质。应当理解的是，在本申请实施例中对第一延长部222的形状不做限制，例如，如图9或图10所示的第一延长部222的形状为矩形，或者，第一延长部222的形状为三角形，又或者，第一延长部222的形状亦为规则地多面体形状。For the aforementioned isolation membrane 22, please continue to refer to Figure 3 or Figure 4. The isolation membrane 22 includes an isolation membrane body 221 and a first extension 222. The isolation membrane body 221 is an overall long strip structure, the first extension 222 extends from the isolation membrane body 221 outside the electrode assembly 20, and the first extension 222 is connected to the outer surface of the electrode assembly 20. The isolation membrane body 221 is used to prevent a short circuit between the first pole piece 21 and the second pole piece 23, while only allowing lithium ions of the electrochemical device to pass through. Among them, the isolation membrane 22 can be selected from a group consisting of polyethylene, polypropylene, and a copolymer of polyethylene and polypropylene. Of course, the isolation membrane 22 is not limited to these materials. It should be understood that in the embodiment of the present application, the shape of the first extension 222 is not limited. For example, the shape of the first extension 222 shown in Figure 9 or Figure 10 is a rectangle, or the shape of the first extension 222 is a triangle, or the shape of the first extension 222 is also a regular polyhedron.
通过第一延长部222从第一端部20a伸出电极组件20外并且第一延长部222连接于电极组件20的外表面，以使得第一极片21和/或第二极片23与隔离膜主体221共同组成用于抵消锂离子电池掉落地面上时对隔离膜主体221施加的作用力的电极组件20，改善了隔离膜主体221受到外部撞击时而产生隔离膜22收缩的问题。The first extension portion 222 extends out of the electrode assembly 20 from the first end portion 20a and is connected to the outer surface of the electrode assembly 20, so that the first pole piece 21 and/or the second pole piece 23 and the isolation membrane main body 221 together constitute the electrode assembly 20 for offsetting the force exerted on the isolation membrane main body 221 when the lithium-ion battery falls to the ground, thereby improving the problem of shrinkage of the isolation membrane 22 when the isolation membrane main body 221 is subjected to external impact.
在一些实施例中，隔离膜22是由隔离膜主体221与第一延长部222采用一体成型工艺制成的。例如，在制造前述隔离膜22的过程中，可以选用整块隔离膜22以隔离膜主体221上伸出有第一延长部222的预设形状进行切割，相对于隔离膜22是由隔离膜主体221与第一延长部222通过粘接得到的来说，如此得到的隔离膜22可保证电极组件20沿第一方向X堆叠厚度不变的同时，亦具备较稳定地结构强度，能够在电极组件20受到外部撞击时扯住隔离膜主体221，以防止隔离膜主体221收缩。在此需要指出的是，隔离膜主体221沿其第二方向Y两端之间的距离大于第一极片21或第二极片23沿其第二方向Y两端之间的距离。当隔离膜主体221与第一极片21、第二极片23一起卷绕时，隔离膜主体221在第一极片21和第二极片23沿其第二方向Y的两端均突出，从而防止第一极片21与第二极片23的边缘部分直接接触发生短路。In some embodiments, the isolation film 22 is made of an isolation film body 221 and a first extension 222 by an integrated molding process. For example, in the process of manufacturing the aforementioned isolation film 22, the entire isolation film 22 can be selected to be cut into a preset shape with the first extension 222 extending from the isolation film body 221. Compared with the isolation film 22 obtained by bonding the isolation film body 221 and the first extension 222, the isolation film 22 obtained in this way can ensure that the stacking thickness of the electrode assembly 20 along the first direction X remains unchanged, and also has a relatively stable structural strength, and can pull the isolation film body 221 when the electrode assembly 20 is subjected to external impact to prevent the isolation film body 221 from shrinking. It should be pointed out here that the distance between the two ends of the isolation film body 221 along the second direction Y is greater than the distance between the two ends of the first pole piece 21 or the second pole piece 23 along the second direction Y. When the isolation membrane body 221 is wound together with the first pole piece 21 and the second pole piece 23, the isolation membrane body 221 protrudes at both ends of the first pole piece 21 and the second pole piece 23 along the second direction Y, thereby preventing the edge portions of the first pole piece 21 and the second pole piece 23 from directly contacting each other and causing a short circuit.
另外，请结合图2一并参阅图6，电极组件20还包括第一极耳24与第二极耳25。第一极耳24是由第一极片21的涂覆区延伸出的未涂覆区形成的，进一步地，第一极耳24自第一极片21沿其第二方向Y上的端表面伸出电极组件20外与电化学装置的正极连接。第二极耳25是由第二极片23的涂覆区延伸出的未涂覆区形成的，第二极耳25自第二极片23沿其第二方向Y上的端表面伸出电极组件20外与电化学装置的负极连接。在一些实施例中，第一极耳24与第二极耳25均是自电极组件20的同一端部表面伸出电极组件20外，并且第一极耳24与第二极耳25沿第三方向Z间隔设置，其中，第一延长部222处于第一极耳24与第二极耳25之间。In addition, please refer to FIG. 6 in conjunction with FIG. 2 . The electrode assembly 20 further includes a first pole tab 24 and a second pole tab 25. The first pole tab 24 is formed by an uncoated area extending from the coated area of the first pole piece 21. Further, the first pole tab 24 extends from the end surface of the first pole piece 21 along the second direction Y to the outside of the electrode assembly 20 and is connected to the positive electrode of the electrochemical device. The second pole tab 25 is formed by an uncoated area extending from the coated area of the second pole piece 23. The second pole tab 25 extends from the end surface of the second pole piece 23 along the second direction Y to the outside of the electrode assembly 20 and is connected to the negative electrode of the electrochemical device. In some embodiments, the first pole tab 24 and the second pole tab 25 both extend from the same end surface of the electrode assembly 20 to the outside of the electrode assembly 20, and the first pole tab 24 and the second pole tab 25 are arranged at intervals along the third direction Z, wherein the first extension portion 222 is located between the first pole tab 24 and the second pole tab 25.
为便于读者更好地理解本申请实施例，下面继续结合图3与图4，对第一延长部222如何连接于电极组件20的外表面进行说明。To help readers better understand the embodiments of the present application, the following continues to describe how the first extension portion 222 is connected to the outer surface of the electrode assembly 20 in conjunction with FIG. 3 and FIG. 4 .
首先，以第二极片23、隔离膜221、第一极片21以及隔离膜222的顺序沿第一方向X依次堆叠得到整体呈长条状的电极组件20。First, the second electrode sheet 23 , the isolation film 221 , the first electrode sheet 21 and the isolation film 222 are stacked in sequence along the first direction X to obtain an electrode assembly 20 that is in a long strip shape as a whole.
之后，层叠好第二极片23、隔离膜221、第一极片21以及隔离膜222绕第二方向Y延伸的卷针的外表面进行逆时针卷绕，卷绕过程结束后拔出卷针，待拔出卷针后再对卷绕式电极组件20进行热压整形，进而得到截面呈腰圆形的卷绕式电极组件20。隔离膜221将第二极片23朝向第一极片21的表面与第一极片21朝向第二极片23的表面分隔开，隔离膜222将第二极片23朝向第一极片21的另一表面与第一极片21朝向电极组件20外的另一表面分隔开，隔离膜221与隔离膜222均用于防止第一极片21与第二极片23出现面接触或点接触而短路。After that, the stacked second pole piece 23, the isolation film 221, the first pole piece 21 and the isolation film 222 are counterclockwise wound around the outer surface of the winding needle extending in the second direction Y. After the winding process is completed, the winding needle is pulled out. After the winding needle is pulled out, the wound electrode assembly 20 is hot pressed and shaped to obtain a wound electrode assembly 20 with an oval cross-section. The isolation film 221 separates the surface of the second pole piece 23 facing the first pole piece 21 from the surface of the first pole piece 21 facing the second pole piece 23, and the isolation film 222 separates the other surface of the second pole piece 23 facing the first pole piece 21 from the other surface of the first pole piece 21 facing the outside of the electrode assembly 20. The isolation film 221 and the isolation film 222 are used to prevent the first pole piece 21 and the second pole piece 23 from short-circuiting due to surface contact or point contact.
其中，卷绕式电极组件20在第二方向Y上具有朝上的第一端部20a与朝下的第二端部20b，第一延长部222自第一端部20a沿第二方向Y伸出电极组件20外连接于电极组件20的外表面。具体地，第一延长部222通过连接件30连接于电极组件20的外表面。如此设置，减少了第一延长部脱离电极组件的外表面的情况发生。采用双面胶可方便地将第一延长部固定于电极组件的外表面。在一些实施例中，连接件30为双面胶纸，即第一延长部222的一表面贴合于双面胶纸其中一粘接面，双面胶纸另一粘接面贴合于电极组件20的外表面。在一些实施例中，连接件30为单面胶纸。应当理解的是，在本申请另一实施例中，连接件30还可被替换为其他具有粘性的胶体，胶体用于涂覆在第一延长部222与电极组件20的外表面的重叠区域内，以将第一延长部222连接于电极组件20的外表面。例如收尾胶，可选但不是必需地，该胶体的成分与电解液中的组分较难地产生反应。Among them, the wound electrode assembly 20 has an upward first end 20a and a downward second end 20b in the second direction Y, and the first extension 222 extends from the first end 20a along the second direction Y to the outside of the electrode assembly 20 and is connected to the outer surface of the electrode assembly 20. Specifically, the first extension 222 is connected to the outer surface of the electrode assembly 20 through the connector 30. In this way, the first extension is reduced from the outer surface of the electrode assembly. The first extension can be conveniently fixed to the outer surface of the electrode assembly by using double-sided tape. In some embodiments, the connector 30 is double-sided tape, that is, one surface of the first extension 222 is attached to one of the adhesive surfaces of the double-sided tape, and the other adhesive surface of the double-sided tape is attached to the outer surface of the electrode assembly 20. In some embodiments, the connector 30 is single-sided tape. It should be understood that in another embodiment of the present application, the connector 30 can also be replaced by other viscous colloids, which are used to be coated in the overlapping area between the first extension 222 and the outer surface of the electrode assembly 20 to connect the first extension 222 to the outer surface of the electrode assembly 20. For example, the finishing glue, optionally but not necessarily, has a component that is difficult to react with the components in the electrolyte.
值得说明的是，在本申请实施例中，电极组件20的外表面是由电极组件20沿第二方向Y具有朝上的端表面与朝下的端表面，以及第一极片21朝向电极组件20外的另一表面所共同形成的。特别地，电极组件20沿第二方向Y上具有朝上的端表面是指除隔离膜主体221朝上的端表面之外的第二极片23朝上的端表面与第一极片21朝上的端表面所共同组成的。与之相似地，电极组件20沿第二方向Y具有朝下的端表面是指除隔离膜主体221朝下的端表面之外的第二极片23朝上的端表面与第一极片21朝上的端表面所共同组成的。换而言之，第一延长部222通过连接件30连接于电极组件20沿第二方向Y具有朝上的端表面与朝下的端表面，以及一极片朝向电极组件20外的另一表面的任意一位置。此外，第一延长部222是自与第二极片23相邻的隔离膜主体221的第一端部20a伸出的。之所以将第一延长部222设置于此，是因为第一延长部222仅需要较短地长度便可连接于电极组件20的外表面，进而可有效地降低生产成本。It is worth noting that, in the embodiment of the present application, the outer surface of the electrode assembly 20 is formed by the electrode assembly 20 having an upward end surface and a downward end surface along the second direction Y, and the other surface of the first pole piece 21 facing the outside of the electrode assembly 20. In particular, the electrode assembly 20 having an upward end surface along the second direction Y refers to the upward end surface of the second pole piece 23 and the upward end surface of the first pole piece 21, except for the upward end surface of the isolation membrane body 221. Similarly, the electrode assembly 20 having a downward end surface along the second direction Y refers to the upward end surface of the second pole piece 23 and the upward end surface of the first pole piece 21, except for the downward end surface of the isolation membrane body 221. In other words, the first extension portion 222 is connected to the electrode assembly 20 having an upward end surface and a downward end surface along the second direction Y, and any position of the other surface of a pole piece facing the outside of the electrode assembly 20 through the connector 30. In addition, the first extension portion 222 extends from the first end portion 20a of the isolation membrane body 221 adjacent to the second electrode sheet 23. The first extension portion 222 is disposed here because the first extension portion 222 only needs a short length to be connected to the outer surface of the electrode assembly 20, thereby effectively reducing production costs.
进一步地，第一延长部222围绕电极组件20的外表面至少一圈。即第一延长部222自电极组件20的第一端部20a沿第二方向Y伸出电极组件20外，再以垂直于第二方向Y的第三方向Z为中心轴线环绕电极组件20的外表面至少一圈，并连接于电极组件20的外表面。如此设置，第一延长部222可将隔离膜主体221靠近电极组件20的第一端部20a的一端与隔离膜主体221靠近电极组件20的第二端部20b的一端均固定住，进一步地增强了电极组件20的结构稳定性，进而增强了电化学装置的抗跌落性能。应当理解的是，在本申请另一实施例中，第一延长部222围绕电极组件20的外表面也可少于一圈，例如，第一延长部222仅伸出电极组件20的第一端部20a一部分，以与电极组件20沿第二方向Y朝上的端表面连接。或者，第一延长部222伸出电极组件20的第一端部20a一部分，以与第二极片23朝电极组件20外的另一表面连接。又或者，第一延长部222伸出电极组件20的第一端部20a一部分，以与电极组件20沿第二方向Y的第二端部20b连接。Further, the first extension portion 222 surrounds the outer surface of the electrode assembly 20 at least once. That is, the first extension portion 222 extends from the first end 20a of the electrode assembly 20 outside the electrode assembly 20 along the second direction Y, and then surrounds the outer surface of the electrode assembly 20 at least once with the third direction Z perpendicular to the second direction Y as the central axis, and is connected to the outer surface of the electrode assembly 20. In this way, the first extension portion 222 can fix both the end of the isolation membrane body 221 close to the first end 20a of the electrode assembly 20 and the end of the isolation membrane body 221 close to the second end 20b of the electrode assembly 20, further enhancing the structural stability of the electrode assembly 20, and thus enhancing the anti-drop performance of the electrochemical device. It should be understood that in another embodiment of the present application, the first extension portion 222 may surround the outer surface of the electrode assembly 20 less than once, for example, the first extension portion 222 only extends out of a portion of the first end 20a of the electrode assembly 20 to connect with the end surface of the electrode assembly 20 facing upward along the second direction Y. Alternatively, the first extension portion 222 extends out of a portion of the first end portion 20a of the electrode assembly 20 to connect with the other surface of the second electrode sheet 23 facing the outside of the electrode assembly 20. Alternatively, the first extension portion 222 extends out of a portion of the first end portion 20a of the electrode assembly 20 to connect with the second end portion 20b of the electrode assembly 20 along the second direction Y.
为进一步改善电化学装置的跌落性能，请参阅图7，可选地，第一延长部222的数量为至少一个，至少一个第一延长部222沿未卷绕时的隔离膜主体221的长度方向间隔设置于隔离膜主体221朝上的一端部，即至少第一延长部222在隔离膜主体221卷绕后是呈错落的布置的。其中，各第一延长部222伸出电极组件20外的长度不一。To further improve the drop performance of the electrochemical device, please refer to FIG. 7 . Optionally, the number of the first extension portion 222 is at least one, and at least one first extension portion 222 is arranged at an upward end of the isolation membrane body 221 along the length direction of the isolation membrane body 221 when it is not wound, that is, at least the first extension portion 222 is arranged in a staggered manner after the isolation membrane body 221 is wound. The lengths of the first extension portions 222 extending out of the electrode assembly 20 are different.
为进一步改善电化学装置的跌落性能，请参阅图8，可选地，隔离膜22还包括与隔离膜主体221一体成型的第二延长部223。第二延长部223自隔离膜主体221伸出电极组件20外，并且第二延长部223连接于电极组件20的外表面。第二延长部固定于电极组件的外表面，提高了电极组件的结构整体性，有利于提升电极组件的抗冲击性能。值得说明的是，第二延长部223是自与第二极片23相邻的隔离膜主体221的第一端部20a的另一侧伸出的，换句话说，第一延长部222与第二延长部223各自独立地设置为与电极组件20的最外圈相邻。之所以将第二延长部223设置于此，是因为第二延长部223仅需要较短地长度便可连接于电极组件20的外表面，进而可有效地降低生产成本。当然了，第二延长部223还可通过粘接与隔离膜主体221相连接。应当理解的是，在本申请实施例中对第二延长部223的形状不做限制，例如，如图X所示的第二延长部223的形状为矩形，或者，第二延长部223的形状为三角形，又或者，第二延长部223的形状亦为规则地多面体形状。To further improve the drop performance of the electrochemical device, please refer to FIG. 8. Optionally, the isolation membrane 22 also includes a second extension portion 223 integrally formed with the isolation membrane body 221. The second extension portion 223 extends from the isolation membrane body 221 outside the electrode assembly 20, and the second extension portion 223 is connected to the outer surface of the electrode assembly 20. The second extension portion is fixed to the outer surface of the electrode assembly, which improves the structural integrity of the electrode assembly and is conducive to improving the impact resistance of the electrode assembly. It is worth noting that the second extension portion 223 extends from the other side of the first end 20a of the isolation membrane body 221 adjacent to the second pole piece 23. In other words, the first extension portion 222 and the second extension portion 223 are each independently arranged to be adjacent to the outermost circle of the electrode assembly 20. The reason why the second extension portion 223 is arranged here is that the second extension portion 223 only needs a shorter length to be connected to the outer surface of the electrode assembly 20, thereby effectively reducing the production cost. Of course, the second extension portion 223 can also be connected to the isolation membrane body 221 by bonding. It should be understood that in the embodiment of the present application, there is no limitation on the shape of the second extension portion 223. For example, as shown in FIG. X, the shape of the second extension portion 223 is a rectangle, or the shape of the second extension portion 223 is a triangle, or the shape of the second extension portion 223 is also a regular polyhedron.
具体地，第二延长部223与第一延长部222沿第一方向X间隔设置于电极组件20的第一端部20a。第二延长部223与第一延长部222自第二方向Y伸出电极组件20外，其中，第二延长部223沿第一方向X弯折并以第三方向Z为中心轴线逆时针环绕，第一延长部222沿第一方向X相反的方向弯折并以第三方向Z为中心轴线顺时针环绕，第二延长部223与第一延长部222可通过连接件30连接于电极组件20的外表面，或者第二延长部223与第一延长部222亦可通过胶体粘接于电极组件20的外表面。即第一延长部与第二延长部从隔离膜的同一端伸出固定于电极组件的外表面。相较于第一延长部的固定来说，隔离膜受到冲击后，可进一步地降低隔离膜受到冲击后的收缩程度。在一些实施例中，连接件30为双面胶纸。Specifically, the second extension portion 223 and the first extension portion 222 are arranged at intervals along the first direction X at the first end portion 20a of the electrode assembly 20. The second extension portion 223 and the first extension portion 222 extend out of the electrode assembly 20 from the second direction Y, wherein the second extension portion 223 is bent along the first direction X and surrounds counterclockwise with the third direction Z as the central axis, and the first extension portion 222 is bent in the opposite direction of the first direction X and surrounds clockwise with the third direction Z as the central axis, and the second extension portion 223 and the first extension portion 222 can be connected to the outer surface of the electrode assembly 20 through the connecting member 30, or the second extension portion 223 and the first extension portion 222 can also be bonded to the outer surface of the electrode assembly 20 through a colloid. That is, the first extension portion and the second extension portion extend from the same end of the isolation membrane and are fixed to the outer surface of the electrode assembly. Compared with the fixation of the first extension portion, after the isolation membrane is impacted, the degree of shrinkage of the isolation membrane after the impact can be further reduced. In some embodiments, the connecting member 30 is double-sided adhesive tape.
为进一步改善电化学装置的跌落性能，可选地，隔离膜22还包括与隔离膜主体221一体成型的第二延长部223。第二延长部223自隔离膜主体221伸出电极组件20外，并且第二延长部223连接于电极组件20的外表面。与前述隔离膜22不同的是，第二延长部223与第一延长部222沿第二方向Y间隔设置于电极组件20的第一端部20a与第二端部20b。值得说明的是，第二延长部223是自与第二极片23相邻的隔离膜主体221的第二端部20b的另一侧伸出的，换句话说，第一延长部222与第二延长部223各自独立地设置为与电极组件20的最外圈相邻。之所以将第二延长部223设置于此，是因为第二延长部223仅需要较短地长度便可连接于电极组件20的外表面，进而可有效地降低生产成本。当然了，第二延长部223还可通过粘接与隔离膜主体221相连接。应当理解的是，在本申请实施例中对第二延长部223的形状不做限制，例如，第二延长部223的形状可为矩形，或者，第二延长部223的形状为三角形，又或者，第二延长部223的形状亦为规则地多面体形状。To further improve the drop performance of the electrochemical device, the isolation membrane 22 may further include a second extension 223 integrally formed with the isolation membrane body 221. The second extension 223 extends from the isolation membrane body 221 outside the electrode assembly 20, and the second extension 223 is connected to the outer surface of the electrode assembly 20. Unlike the aforementioned isolation membrane 22, the second extension 223 and the first extension 222 are arranged at intervals along the second direction Y at the first end 20a and the second end 20b of the electrode assembly 20. It is worth noting that the second extension 223 extends from the other side of the second end 20b of the isolation membrane body 221 adjacent to the second pole piece 23. In other words, the first extension 222 and the second extension 223 are independently arranged adjacent to the outermost circle of the electrode assembly 20. The second extension 223 is arranged here because the second extension 223 only needs a shorter length to be connected to the outer surface of the electrode assembly 20, thereby effectively reducing the production cost. Of course, the second extension portion 223 can also be connected to the isolation membrane body 221 by bonding. It should be understood that in the embodiment of the present application, there is no limitation on the shape of the second extension portion 223. For example, the shape of the second extension portion 223 can be a rectangle, or the shape of the second extension portion 223 can be a triangle, or the shape of the second extension portion 223 can also be a regular polyhedron.
具体地，第一延长部222设置于电极组件20的第一端部20a，第二延长部223则设置于电极组件20的第二端部20b，其中，第一延长部222自第二方向Y伸出电极组件20外，第一延长部222可沿第一方向X或与第一方向X相反的方向弯折，并以第三方向Z为中心轴线做顺时针或逆时针转动，第一延长部222可通过连接件30或者收尾胶连接于电极组件20的外表面。第二延长部223自与第二方向Y相反的方向伸出电极组件20外，第二延长部223可沿第一方向X或与第一方向X相反的方向弯折，并以第三方向Z为中心轴线做顺时针或逆时针转动，第二延长部223可通过连接件30或者收尾胶连接于电极组件20的外表面。在一些实施例中，第一延长部222与第二延长部223通过连接件30相连接。其中，连接件30为双面胶纸。Specifically, the first extension portion 222 is disposed at the first end portion 20a of the electrode assembly 20, and the second extension portion 223 is disposed at the second end portion 20b of the electrode assembly 20, wherein the first extension portion 222 extends out of the electrode assembly 20 from the second direction Y, and the first extension portion 222 can be bent along the first direction X or the direction opposite to the first direction X, and rotate clockwise or counterclockwise with the third direction Z as the central axis, and the first extension portion 222 can be connected to the outer surface of the electrode assembly 20 through a connector 30 or a tailing adhesive. The second extension portion 223 extends out of the electrode assembly 20 from the direction opposite to the second direction Y, and the second extension portion 223 can be bent along the first direction X or the direction opposite to the first direction X, and rotate clockwise or counterclockwise with the third direction Z as the central axis, and the second extension portion 223 can be connected to the outer surface of the electrode assembly 20 through a connector 30 or a tailing adhesive. In some embodiments, the first extension portion 222 and the second extension portion 223 are connected through a connector 30. Wherein, the connector 30 is a double-sided adhesive tape.
值得说明的是，本申请实施例中的“朝上”、“朝下”是指电极组件20收容于壳体10内所具有的取向。例如，卷绕式电极组件20或层叠式电极组件20收容于壳体10内，朝上是指该电极组件20的第一极耳24与第二极耳25伸出方向相同的朝向，朝下是指与朝上相反的朝向，即指向远离电极组件20的第一极耳24与第二极耳25所在侧。另外，本申请实施例中，第一方向X、第二方向Y、第三方向Z中的任意两者均相互垂直。其中，第一方向X是指第二极片23、隔离膜22、第一极片21以及隔离膜22顺序堆叠的方向，也可以理解为电极组件20的厚度方向，第二方向Y是第一延长部222或第二延长部223的环绕方向，也可以理解为电极组件20的长度方向，第三方向Z是指指电极组件20的卷绕方向，也可以理解为电极组件20的宽度方向。It is worth noting that "upward" and "downward" in the embodiment of the present application refer to the orientation of the electrode assembly 20 when it is accommodated in the housing 10. For example, the wound electrode assembly 20 or the stacked electrode assembly 20 is accommodated in the housing 10, and upward refers to the orientation in which the first pole ear 24 and the second pole ear 25 of the electrode assembly 20 extend in the same direction, and downward refers to the opposite direction to upward, that is, pointing to the side where the first pole ear 24 and the second pole ear 25 are located away from the electrode assembly 20. In addition, in the embodiment of the present application, any two of the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. Among them, the first direction X refers to the direction in which the second pole piece 23, the isolation film 22, the first pole piece 21, and the isolation film 22 are stacked in sequence, which can also be understood as the thickness direction of the electrode assembly 20, the second direction Y is the winding direction of the first extension portion 222 or the second extension portion 223, which can also be understood as the length direction of the electrode assembly 20, and the third direction Z refers to the winding direction of the electrode assembly 20, which can also be understood as the width direction of the electrode assembly 20.
在本申请实施例中，通过第一延长部222从第一端部20a伸出电极组件20外并且第一延长部222连接于电极组件20的外表面，以使得第一极片21和/或第二极片23与隔离膜主体221共同组成用于抵消锂离子电池掉落地面上时对隔离膜主体221施加的作用力的电极组件20，改善了隔离膜主体221受到外部撞击时而产生隔离膜22收缩的问题。In the embodiment of the present application, the first extension portion 222 extends from the first end portion 20a outside the electrode assembly 20 and is connected to the outer surface of the electrode assembly 20, so that the first pole piece 21 and/or the second pole piece 23 and the isolation membrane body 221 together constitute the electrode assembly 20 for offsetting the force exerted on the isolation membrane body 221 when the lithium-ion battery falls to the ground, thereby improving the problem of shrinkage of the isolation membrane 22 when the isolation membrane body 221 is subjected to external impact.
基于同一发明构思，本申请另一实施例还提供了一种用电设备。该用电设备包括上述实施例中所述的电化学装置以及负载。本实施例中，该用电设备为手机；可以理解的是，在本申请的其他实施例中，该用电设备还可以是平板电脑、电脑、无人机等其他需要由电驱动的用电设备。Based on the same inventive concept, another embodiment of the present application further provides an electric device. The electric device includes the electrochemical device and the load described in the above embodiment. In this embodiment, the electric device is a mobile phone; it is understandable that in other embodiments of the present application, the electric device can also be a tablet computer, a computer, a drone, or other electric devices that need to be driven by electricity.
以上所述仅为本申请的实施方式，并非因此限制本申请的专利范围，凡是利用本申请说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本申请的专利保护范围内。The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110680719.4ACN115498366B (en) | 2021-06-18 | 2021-06-18 | Electrochemical device and electric equipment |
| Application Number | Priority Date | Filing Date | Title |
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| CN202110680719.4ACN115498366B (en) | 2021-06-18 | 2021-06-18 | Electrochemical device and electric equipment |
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| CN115498366A CN115498366A (en) | 2022-12-20 |
| CN115498366Btrue CN115498366B (en) | 2024-07-05 |
| Application Number | Title | Priority Date | Filing Date |
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| CN202110680719.4AActiveCN115498366B (en) | 2021-06-18 | 2021-06-18 | Electrochemical device and electric equipment |
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