WO2023193256A1

WO2023193256A1 - Connecting member, battery cell, battery, and electrical device

Info

Publication number: WO2023193256A1
Application number: PCT/CN2022/085908
Authority: WO
Inventors: 王利钦; 李全坤; 谢勇锋; 杨剑雄; 黄发军
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2022-04-08
Filing date: 2022-04-08
Publication date: 2023-10-12
Also published as: CN117256074A

Abstract

Disclosed in embodiments of the present application are a connecting member, a battery cell, a battery, and an electrical device. The connecting member is used for realizing electrical connection between an electrode terminal and a tab of the battery cell; the connecting member comprises: an electrode terminal soldering part, a connecting part, and a body part; the connecting part is used for connecting the electrode terminal soldering part and the body part; the electrode terminal soldering part is soldered with the electrode terminal; the roughness of the surface of the electrode terminal soldering part farthest from the electrode terminal is greater than the toughness of the surface of the body part farthest from the electrode terminal; and the thickness of the electrode terminal soldering part is smaller than the thickness of the body part. According to the connecting member, the battery cell, the battery, and the electrical device of the embodiments of the present application, the soldering efficiency between the connecting member and the electrode terminal can be improved, thereby improving the performance of the battery.

Description

连接构件、电池单体、电池和用电设备Connecting components, battery cells, batteries and electrical equipment

技术领域Technical field

本申请涉及电池领域，更为具体地，涉及一种连接构件、电池单体、电池和用电设备。The present application relates to the field of batteries, and more specifically, to a connecting member, a battery cell, a battery and electrical equipment.

背景技术Background technique

节能减排是汽车产业可持续发展的关键。在这种情况下，电动车辆由于其节能环保的优势成为汽车产业可持续发展的重要组成部分。而对于电动车辆而言，电池技术又是关乎其发展的一项重要因素。Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. In this case, electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy-saving and environmentally friendly advantages. For electric vehicles, battery technology is an important factor related to their development.

随着电池技术的发展，如何提高电池的生产加工效率已经成为电池技术发展中尤为重要的问题。With the development of battery technology, how to improve the production and processing efficiency of batteries has become a particularly important issue in the development of battery technology.

发明内容Contents of the invention

本申请实施例提供了一种连接构件、电池单体、电池和用电设备，能够提高连接构件与电极端子之间的焊接效率，进而提高电池的性能。Embodiments of the present application provide a connecting member, a battery cell, a battery and electrical equipment, which can improve the welding efficiency between the connecting member and the electrode terminal, thereby improving the performance of the battery.

第一方面，提供了一种连接构件，所述连接构件用于实现电池单体的电极端子与极耳之间的电连接，所述连接构件包括：电极端子焊接部、连接部和主体部，其中，所述连接部用于连接所述电极端子焊接部和所述主体部，所述电极端子焊接部用于与所述电极端子焊接，所述电极端子焊接部的远离所述电极端子的表面的粗糙度大于所述主体部的远离所述电极端子的表面的粗糙度，所述电极端子焊接部的厚度小于所述主体部的厚度。In a first aspect, a connection member is provided, the connection member is used to realize the electrical connection between the electrode terminal and the tab of the battery cell, the connection member includes: an electrode terminal welding part, a connection part and a main body part, Wherein, the connecting part is used to connect the electrode terminal welding part and the main body part, the electrode terminal welding part is used to weld with the electrode terminal, and the surface of the electrode terminal welding part away from the electrode terminal The roughness is greater than the roughness of the surface of the main body part away from the electrode terminal, and the thickness of the electrode terminal welding part is smaller than the thickness of the main body part.

因此，本申请实施例的连接构件，该电极端子焊接部的远离电极端子的表面的粗糙度，大于主体部的远离电极端子的表面的粗糙度，这样有利于提高焊接效果。尤其是对于激光焊接，可以通过电极端子焊接部粗糙表面吸收焊接时的激光能量，减小激光焊接功率，降低生产成本；同时还可避免焊渣出现，提升焊接效果，防止电池单体内部短路，进而提高电池的安全性能和品质。并且，该电极端子焊接部的厚度小于该主体部的厚度，相比于电极端子焊接部的厚度较大的情况，厚度较小可以使得该焊接部位熔融穿透性更好，在该连接构件的电极组件焊接部与电极端子之间不出现虚焊的情况下，可以适当降低焊接功率，同时也可以保证焊接效果以及该连接构件与电极端子之间的可靠性，也可以保证连接构件与电极端子所在的盖板之间的稳定性和可靠性，进而提高了电池单体的稳定性和安全性。Therefore, in the connecting member of the embodiment of the present application, the roughness of the surface of the electrode terminal welding part away from the electrode terminal is greater than the roughness of the surface of the main body part away from the electrode terminal, which is beneficial to improving the welding effect. Especially for laser welding, the rough surface of the welding part of the electrode terminal can absorb the laser energy during welding, reduce the laser welding power, and reduce production costs. At the same time, it can also avoid the appearance of welding slag, improve the welding effect, and prevent internal short circuits of battery cells. Thereby improving the safety performance and quality of the battery. Moreover, the thickness of the electrode terminal welding part is smaller than the thickness of the main body part. Compared with the case where the thickness of the electrode terminal welding part is larger, the smaller thickness can make the melt penetration of the welding part better. When there is no virtual welding between the welding part of the electrode assembly and the electrode terminal, the welding power can be appropriately reduced, and the welding effect and the reliability between the connecting member and the electrode terminal can also be ensured. The stability and reliability between the cover plates are improved, thereby improving the stability and safety of the battery cells.

在一些实施例中，所述电极端子焊接部的朝向所述电极端子的表面凸出于或者凹陷于所述主体部的朝向所述电极端子的表面。In some embodiments, a surface of the electrode terminal welding portion facing the electrode terminal protrudes from or is recessed from a surface of the main body portion facing the electrode terminal.

电极端子焊接部的朝向该电极端子的表面凸出于该主体部的朝向该电极端子的表面，使得电极端子焊接部更加靠近电极端子，便于实现二者之间的连接；电极端子焊接部的朝向该电极端子的表面凹陷于该主体部的朝向该电极端子的表面，可以充分利用电池单体内部的空间，尤其在电极端子的朝向主体部分的表面凸出于所在的盖板的朝向主体部分的表面的情况下，可以减少连接构件占用空间。The surface of the electrode terminal welding portion facing the electrode terminal protrudes from the surface of the main body portion facing the electrode terminal, so that the electrode terminal welding portion is closer to the electrode terminal and facilitates the connection between the two; the orientation of the electrode terminal welding portion The surface of the electrode terminal is recessed in the surface of the main body facing the electrode terminal, which can fully utilize the space inside the battery cell, especially when the surface of the electrode terminal facing the main body protrudes from the surface of the cover plate facing the main body. In the case of surface, the space occupied by connecting components can be reduced.

在一些实施例中，所述电极端子焊接部的厚度H31与所述主体部的厚度H33满足：5％≤(H33-H31)/H33≤65％。若该电极端子焊接部的厚度过小，则可能会导致焊接时熔穿该电极端子焊接部；相反，若该电极端子焊接部的厚度过大，则无法有效降低焊接功率。In some embodiments, the thickness H31 of the electrode terminal welding portion and the thickness H33 of the main body portion satisfy: 5%≤(H33-H31)/H33≤65%. If the thickness of the electrode terminal welding part is too small, the welding part of the electrode terminal may be penetrated during welding; conversely, if the thickness of the electrode terminal welding part is too large, the welding power cannot be effectively reduced.

在一些实施例中，所述电极端子焊接部的朝向所述电极端子的表面的面积与所述连接构件的朝向所述电极端子的表面的面积的比值的取值范围为[1/50,3/5]。若电极端子焊接部的朝向电极端子的表面的面积过小，即电极端子焊接部的减薄区域过小，则不利于焊接，例如，若实际焊接面积超过了减薄区域，则减薄区域并不能有效降低焊接功率，若实际焊接面积等于减薄区域，那么会导致焊接面积过小，进而会导致焊接不稳定。相反的，若电极端子焊接部的朝向所述电极端子的表面的面积过大，即减薄面积过大，由于实际焊接面积有限，过大的减薄面积并不会使得焊接功率显著增加，反而会增加该连接构件的加工难度，降低生产效率。In some embodiments, the ratio of the area of the surface of the electrode terminal welding portion facing the electrode terminal to the area of the surface of the connecting member facing the electrode terminal ranges from [1/50,3 /5]. If the area of the surface of the electrode terminal welding part facing the electrode terminal is too small, that is, the thinned area of the electrode terminal welding part is too small, it is not conducive to welding. For example, if the actual welding area exceeds the thinned area, the thinned area will not The welding power cannot be effectively reduced. If the actual welding area is equal to the thinning area, the welding area will be too small, which will lead to unstable welding. On the contrary, if the area of the surface of the electrode terminal welding portion facing the electrode terminal is too large, that is, the thinning area is too large, since the actual welding area is limited, the excessive thinning area will not significantly increase the welding power, but will instead significantly increase the welding power. This will increase the processing difficulty of the connecting component and reduce production efficiency.

在一些实施例中，所述连接部的厚度小于所述主体部的厚度，以便于加工，同时还可以减轻该连接构件的整体重量，也就减轻了电池单体的重量。In some embodiments, the thickness of the connecting portion is smaller than the thickness of the main body portion to facilitate processing and to reduce the overall weight of the connecting member, thereby reducing the weight of the battery cells.

在一些实施例中，所述连接部的厚度大于所述电极端子焊接部的厚度，既便于加工实现，也可以保证连接部的可靠性。In some embodiments, the thickness of the connection part is greater than the thickness of the electrode terminal welding part, which facilitates processing and ensures the reliability of the connection part.

在一些实施例中，所述连接部的厚度与所述主体部的厚度的比值大于或者等于4/5，以避免该连接部的厚度过小时，该连接构件结构不稳定。In some embodiments, the ratio of the thickness of the connecting portion to the thickness of the main body portion is greater than or equal to 4/5 to avoid structural instability of the connecting member if the thickness of the connecting portion is too small.

在一些实施例中，所述连接部与所述主体部之间的夹角的取值范围为(90°,135°]。连接部与主体部之间的夹角也就是加工时的拔模角度。该拔模角度通常大于90°，以便于脱模；相反的，该拔模角度通常也不会设置过大，以免增加加工难度。In some embodiments, the angle between the connection part and the main body part ranges from (90°, 135°]. The angle between the connection part and the main body part is also the draft during processing. Angle. The draft angle is usually greater than 90° to facilitate demoulding; on the contrary, the draft angle is usually not set too large to avoid increasing processing difficulty.

在一些实施例中，所述主体部包括极耳焊接区，所述极耳焊接区用于与所述极耳焊接，以实现该连接构件与极耳之间的连接。In some embodiments, the main body part includes a tab welding area, and the tab welding area is used for welding with the tab to achieve connection between the connecting member and the tab.

在一些实施例中，所述极耳焊接区位于所述主体部的远离所述电极端子焊接部的一端，以避免极耳焊接区和电极端子焊接部之间相互影响，同时也便于加工。In some embodiments, the tab welding area is located at an end of the main body part away from the electrode terminal welding part to avoid mutual influence between the tab welding area and the electrode terminal welding part and to facilitate processing.

在一些实施例中，所述主体部的不同区域的厚度相等，以便于加工。In some embodiments, different areas of the body portion are of equal thickness to facilitate processing.

在一些实施例中，所述连接部环绕所述电极端子焊接部，所述主体部环绕所述连接部，以保证该连接构件的强度，进而保证电池单体的可靠性。In some embodiments, the connecting portion surrounds the electrode terminal welding portion, and the main body portion surrounds the connecting portion to ensure the strength of the connecting member, thereby ensuring the reliability of the battery cell.

第二方面，提供了一种电池单体，包括：电极端子；电极组件，所述电极组件包括极耳；第一方面或者第一方面中任意一个实施例所述的连接构件，所述连接构件用于实现所述电极端子与所述极耳之间的电连接。In a second aspect, a battery cell is provided, including: an electrode terminal; an electrode assembly including a tab; the first aspect or the connecting member described in any embodiment of the first aspect, the connecting member Used to achieve electrical connection between the electrode terminal and the tab.

第三方面，提供了一种电池，包括：多个电池单体，所述电池单体包括第一方面或者第一方面中任意一个实施例所述的连接构件。In a third aspect, a battery is provided, including: a plurality of battery cells, wherein the battery cells include the first aspect or the connecting member described in any embodiment of the first aspect.

第四方面，提供了一种用电设备，包括：电池，所述电池用于为所述用电设备提供电能，所述电池包括第一方面或者第一方面中任意一个实施例所述的连接构件。In a fourth aspect, an electrical device is provided, including: a battery, the battery being used to provide electrical energy to the electrical device, the battery including the connection described in the first aspect or any one of the embodiments of the first aspect. member.

在一些实施例中，所述用电设备为车辆、船舶或航天器。In some embodiments, the electrical equipment is a vehicle, ship or spacecraft.

附图说明Description of drawings

图1为本申请一个实施例的车辆的示意图；Figure 1 is a schematic diagram of a vehicle according to an embodiment of the present application;

图2为本申请一个实施例的电池的结构示意图；Figure 2 is a schematic structural diagram of a battery according to an embodiment of the present application;

图3为本申请一个实施例的电池单体的分解结构示意图；Figure 3 is a schematic diagram of the exploded structure of a battery cell according to one embodiment of the present application;

图4为本申请一个实施例的连接构件的结构示意图；Figure 4 is a schematic structural diagram of a connecting member according to an embodiment of the present application;

图5为本申请一个实施例的连接构件的俯视示意图；Figure 5 is a schematic top view of a connecting member according to an embodiment of the present application;

图6为本申请一个实施例的连接构件的截面示意图；Figure 6 is a schematic cross-sectional view of a connecting member according to an embodiment of the present application;

图7为本申请一个实施例的连接构件的侧视示意图；Figure 7 is a schematic side view of a connecting member according to an embodiment of the present application;

图8为本申请另一个实施例的电池单体的分解结构示意图；Figure 8 is a schematic diagram of the exploded structure of a battery cell according to another embodiment of the present application;

图9为本申请另一个实施例的连接构件的结构示意图；Figure 9 is a schematic structural diagram of a connecting member according to another embodiment of the present application;

图10为本申请另一个实施例的连接构件的俯视示意图；Figure 10 is a schematic top view of a connecting member according to another embodiment of the present application;

图11为本申请另一个实施例的连接构件的侧视示意图；Figure 11 is a schematic side view of a connecting member according to another embodiment of the present application;

图12为本申请再一个实施例的电池单体的分解结构示意图；Figure 12 is a schematic diagram of the exploded structure of a battery cell according to yet another embodiment of the present application;

图13为本申请再一个实施例的连接构件的结构示意图；Figure 13 is a schematic structural diagram of a connecting member according to yet another embodiment of the present application;

图14为本申请再一个实施例的连接构件的结构示意图；Figure 14 is a schematic structural diagram of a connecting member according to yet another embodiment of the present application;

图15为本申请再一个实施例的连接构件的俯视示意图；Figure 15 is a schematic top view of a connecting member according to yet another embodiment of the present application;

图16为本申请再一个实施例的连接构件的截面示意图。Figure 16 is a schematic cross-sectional view of a connecting member according to yet another embodiment of the present application.

在附图中，附图并未按照实际的比例绘制。In the drawings, the drawings are not drawn to actual scale.

具体实施方式Detailed ways

下面将结合附图，对本申请实施例中的技术方案进行描述。The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are Apply for some of the embodiments, not all of them. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application.

除非另有定义，本申请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；本申请中在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，不是旨在于限制本申请；本申请的说明书和权利要求书及上述附图说明中的术语“包括”和“具有”以及它们的任何变形，意图在于覆盖不排他的包含。本申请的说明书和权利要求书或上述附图中的术语“第一”、“第二”等是用于区别不同对象，而不是用于描述特定顺序或主次关系。Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the technical field of this application; the terms used in the specification of this application are only for describing specific implementations. The purpose of the examples is not intended to limit the application; the terms "including" and "having" and any variations thereof in the description and claims of the application and the above description of the drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the description and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or priority relationship.

在本申请中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本申请所描述的实施例可以与其它实施例相结合。Reference in this application to "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

在本申请的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”、“附接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本申请中的具体含义。In the description of this application, it should be noted that, unless otherwise clearly stated and limited, the terms "installation", "connection", "connection" and "attachment" should be understood in a broad sense. For example, it can be a fixed connection, It can also be detachably connected or integrally connected; it can be directly connected or indirectly connected through an intermediate medium; it can be internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

本申请中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本申请中字符“/”，一般表示前后关联对象是一种“或”的关系。The term "and/or" in this application is just an association relationship describing related objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, alone There are three situations B. In addition, the character "/" in this application generally indicates that the related objects are an "or" relationship.

在本申请的实施例中，相同的附图标记表示相同的部件，并且为了简洁，在不同实施例中，省略对相同部件的详细说明。应理解，附图示出的本申请实施例中的各种部件的厚度、长宽等尺寸，以及集成装置的整体厚度、长宽等尺寸仅为示例性说明，而不应对本申请构成任何限定。In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of simplicity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length and width of the integrated device, are only illustrative illustrations and should not constitute any limitation to the present application. .

本申请中出现的“多个”指的是两个以上(包括两个)，同理，“多组”指的是两组以上(包括两组)，“多片”指的是两片以上(包括两片)。"Multiple" appearing in this application refers to more than two (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple tablets" refers to two or more tablets. (Includes two pieces).

本申请中，电池单体可以包括锂离子二次电池、锂离子一次电池、锂硫电池、钠锂离子电池、钠离子电池或镁离子电池等，本申请实施例对此并不限定。电池单体可呈圆柱体、扁平体、长方体或其它形状等，本申请实施例对此也不限定。电池单体一般按封装的方式分成三种：柱形电池单体、方形电池单体和软包电池单体，本申请实施例对此也不限定。In this application, the battery cells may include lithium ion secondary batteries, lithium ion primary batteries, lithium-sulfur batteries, sodium lithium ion batteries, sodium ion batteries or magnesium ion batteries, etc., which are not limited in the embodiments of this application. The battery cell may be in the shape of a cylinder, a flat body, a rectangular parallelepiped or other shapes, and the embodiments of the present application are not limited to this. Battery cells are generally divided into three types according to packaging methods: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application are not limited to this.

本申请的实施例所提到的电池是指包括一个或多个电池单体以提供更高的电压和容量的单一的物理模块。例如，本申请中所提到的电池可以包括电池模块或电池包等。电池一般包括用于封装一个或多个电池单体的箱体。箱体可以避免液体或其他异物影响电池单体的充电或放电。The battery mentioned in the embodiments of this application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack. Batteries generally include a box for packaging one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

电池单体包括电极组件和电解液，电极组件由正极极片、负极极片和隔离膜组成。电池单体主要依靠金属离子在正极极片和负极极片之间移动来工作。正极极片包括正极集流体和正极活性物质层，正极活性物质层涂覆于正极集流体的表面，未涂敷正极活性物质层的正极集流体凸出于已涂覆正极活性物质层的正极集流体，未涂敷正极活性物质层的正极集流体作为正极极耳。以锂离子电池为例，正极集流体的材料可以为铝，正极活性物质可以为钴酸锂、磷酸铁锂、三元锂或锰酸锂等。负极极片包括负极集流体和负极活性物质层，负极活性物质层涂覆于负极集流体的表面，未涂敷负极活性物质层的负极集流体凸出于已涂覆负极活性物质层的负极集流体，未涂敷负极活性物质层的负极集流体作为负极极耳。负极集流体的材料可以为铜，负极活性物质可以为碳或硅等。为了保证通过大电流而不发生熔断，正极极耳的数量为多个且层叠在一起，负极极耳的数量为多个且层叠在一起。隔离膜的材质可以为聚丙烯 (polypropylene，PP)或聚乙烯(polyethylene，PE)等。此外，电极组件可以是卷绕式结构，也可以是叠片式结构，本申请实施例并不限于此。The battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode plate, a negative electrode plate and a separator. Battery cells mainly rely on the movement of metal ions between the positive and negative electrodes to work. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector. The positive electrode current collector that is not coated with the positive electrode active material layer protrudes from the positive electrode collector that is coated with the positive electrode active material layer. Fluid, the positive electrode current collector without the positive electrode active material layer is used as the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganate, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector that is not coated with the negative electrode active material layer protrudes from the negative electrode collector that is coated with the negative electrode active material layer. Fluid, the negative electrode current collector that is not coated with the negative electrode active material layer serves as the negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon. In order to ensure that large currents can pass through without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the isolation film can be polypropylene (PP) or polyethylene (polyethylene, PE), etc. In addition, the electrode assembly may have a rolled structure or a laminated structure, and the embodiments of the present application are not limited thereto.

电池技术的发展要同时考虑多方面的设计因素，例如，能量密度、循环寿命、放电容量、充放电倍率等性能参数，另外，还需要考虑电池的安全性。例如，对于电池单体，其一般包括电极组件、电解液、容纳电极组件和电解液的壳体及装配在壳体上的盖板，盖板上通常装配有用于输入或输出电能的电极端子。电池单体在进行组装时，电极组件和盖板上电极端子的连接一般是通过连接构件来间接连接，即通过焊接将连接构件分别与电极组件和电极端子电连接。通常电极端子和连接构件之间采用激光焊接的方式，激光焊接具有功率高，焊接牢固和结构稳定的特点。但是，若焊接功率较大，易融化周边的塑胶等材质的部件；相反的，若焊接功率较小，又会出现虚焊现象，影响焊接效果，进而影响连接构件与盖板之间的稳定性，进而影响电池单体的性能。The development of battery technology must consider multiple design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, battery safety also needs to be considered. For example, a battery cell generally includes an electrode assembly, an electrolyte, a housing that accommodates the electrode assembly and the electrolyte, and a cover plate assembled on the housing. The cover plate is usually equipped with electrode terminals for inputting or outputting electrical energy. When the battery cells are assembled, the electrode assembly and the electrode terminal on the cover are generally connected indirectly through connecting members, that is, the connecting members are electrically connected to the electrode assembly and the electrode terminals respectively through welding. Usually laser welding is used between electrode terminals and connecting components. Laser welding has the characteristics of high power, firm welding and stable structure. However, if the welding power is high, it is easy to melt the surrounding plastic and other material parts; conversely, if the welding power is low, virtual welding will occur, affecting the welding effect, and thus affecting the stability between the connecting components and the cover. , thereby affecting the performance of the battery cells.

因此，本申请实施例提供了一种连接构件，该连接构件包括：电极端子焊接部、连接部和主体部。其中，该连接部用于连接该电极端子焊接部和该主体部，该电极端子焊接部用于与该电极端子焊接。该电极端子焊接部的远离电极端子的表面的粗糙度大于主体部的远离电极端子的表面的粗糙度，这样有利于提高焊接效果。尤其是对于激光焊接，可以通过电极端子焊接部粗糙表面吸收焊接时的激光能量，减小激光焊接功率，降低生产成本；同时还可避免焊渣出现，提升焊接效果，防止电池单体内部短路，进而提高电池的安全性能和品质。另外，该电极端子焊接部的厚度小于该主体部的厚度。这样，相比于电极端子焊接部的厚度较大的情况，电极端子焊接部的厚度较小可以使得该焊接部位熔融穿透性更好，在该连接构件的电极组件焊接部与电极端子之间不出现虚焊的情况下，可以适当降低焊接功率，同时保证了焊接效果以及该连接构件与电极端子之间的可靠性。Therefore, embodiments of the present application provide a connecting member, which includes: an electrode terminal welding part, a connecting part and a main body part. Wherein, the connecting part is used to connect the electrode terminal welding part and the main body part, and the electrode terminal welding part is used to weld with the electrode terminal. The roughness of the surface of the electrode terminal welding portion away from the electrode terminal is greater than the roughness of the surface of the main body portion away from the electrode terminal, which is beneficial to improving the welding effect. Especially for laser welding, the rough surface of the welding part of the electrode terminal can absorb the laser energy during welding, reduce the laser welding power, and reduce production costs. At the same time, it can also avoid the appearance of welding slag, improve the welding effect, and prevent internal short circuits of battery cells. Thereby improving the safety performance and quality of the battery. In addition, the thickness of the electrode terminal welding portion is smaller than the thickness of the main body portion. In this way, compared with the case where the thickness of the electrode terminal welding part is larger, the smaller thickness of the electrode terminal welding part can make the welding part have better melt penetration, between the electrode assembly welding part of the connecting member and the electrode terminal Without virtual welding, the welding power can be appropriately reduced while ensuring the welding effect and the reliability between the connecting component and the electrode terminal.

本申请实施例描述的技术方案均适用于各种使用电池的用电设备。该用电设备可以是车辆、手机、便携式设备、笔记本电脑、轮船、航天器、电动玩具和电动工具等。车辆可以是燃油汽车、燃气汽车或新能源汽车，新能源汽车可以是纯电动汽车、混合动力汽车或增程式汽车等；航天器包括飞机、火箭、航天飞机和宇宙飞船等；电动玩具包括固定式或移动式的电动玩具，例如，游戏机、电动汽车玩具、电动轮船玩具和电动飞机玩具等；电动工具包括金属切削电动工具、研磨电动工具、装配电动工具和铁道用电动工具，例如，电钻、电动砂轮机、电动扳手、电动螺丝刀、电锤、冲击电钻、混凝土振动器和电刨等。本申请实施例对上述用电设备不做特殊限制。The technical solutions described in the embodiments of this application are applicable to various electrical equipment using batteries. The electrical equipment can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and power tools, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc.; spacecraft include aircraft, rockets, space shuttles and spaceships; electric toys include stationary Or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, Electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc. The embodiments of this application impose no special restrictions on the above electrical equipment.

以下实施例为了方便说明，以用电设备为车辆为例进行说明。For convenience of explanation, the following embodiments take the electrical equipment as a vehicle as an example.

例如，如图1所示，为本申请一个实施例的一种车辆1的结构示意图，车辆1可以为燃油汽车、燃气汽车或新能源汽车，新能源汽车可以是纯电动汽车、混合动力汽车或增程式汽车等。车辆1的内部可以设置马达40，控制器50以及电池10，控制器50用来控制电池10为马达40的供电。例如，在车辆1的底部或车头或车尾可以设置电池10。电池10可以用于车辆1的供电，例如，电池10可以作为车辆1的操作电源，用于车辆1的电路***，例如，用于车辆1的启动、导航和运行时的工作用电需求。在本申请的另一实施例中，电池10不仅仅可以作为车辆1的操作电源，还可以作为车辆1的驱动电源，替代或部分地替代燃油或天然气为车辆1提供驱动动力。For example, as shown in Figure 1, it is a schematic structural diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or a new energy vehicle. Extended range vehicles, etc. A motor 40 , a controller 50 and a battery 10 may be disposed inside the vehicle 1 . The controller 50 is used to control the battery 10 to provide power to the motor 40 . For example, the battery 10 may be disposed at the bottom, front or rear of the vehicle 1 . The battery 10 can be used to supply power to the vehicle 1 . For example, the battery 10 can be used as an operating power source of the vehicle 1 and used in the circuit system of the vehicle 1 , for example, to meet the power requirements for starting, navigation, and operation of the vehicle 1 . In another embodiment of the present application, the battery 10 can not only be used as an operating power source of the vehicle 1 , but also can be used as a driving power source of the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

为了满足不同的使用电力需求，电池可以包括多个电池单体，其中，多个电池单体之间可以串联或并联或混联，混联是指串联和并联的混合。电池也可以称为电池包。在一些实施例中，多个电池单体可以先串联或并联或混联组成电池模块，多个电池模块再串联或并联或混联组成电池。也就是说，多个电池单体可以直接组成电池，也可以先组成电池模块，电池模块再组成电池。In order to meet different power requirements, the battery may include multiple battery cells, wherein the multiple battery cells may be connected in series, in parallel, or in mixed connection. Hybrid connection refers to a mixture of series and parallel connection. Batteries may also be called battery packs. In some embodiments, multiple battery cells may be first connected in series, parallel, or mixed to form a battery module, and then multiple battery modules may be connected in series, parallel, or mixed to form a battery. In other words, multiple battery cells can directly form a battery, or they can first form a battery module, and then the battery module can form a battery.

例如，图2示出了本申请一个实施例的一种电池10的结构示意图，电池10可以包括至少一个电池模块200。电池模块200包括多个电池单体20。电池10还可以包括箱体11，箱体11内部为中空结构，多个电池单体20容纳于箱体11内。图2示出了本申请实施例的箱体11的一种可能的实现方式，如图2所示，箱体11可以包括两部分，这里分别称为第一箱体部111和第二箱体部112，第一箱体部111和第二箱体部112扣合在一起。第一箱体部111和第二箱体部112的形状可以根据电池模块200组合的形状而定，第一箱体部111和第二箱体部112中至少一个具有一个开口。例如，如图2所示，该第一箱体部111和第二箱体部112均可以为中空长方体且各自只有一个面为开口面，第一箱体部111的开口和第二箱体部112的开口相对设置，并且第一箱体部111和第二箱体部112相互扣合形成具有封闭腔室的箱体11。For example, FIG. 2 shows a schematic structural diagram of a battery 10 according to an embodiment of the present application. The battery 10 may include at least one battery module 200 . The battery module 200 includes a plurality of battery cells 20 . The battery 10 may also include a box 11. The inside of the box 11 is a hollow structure, and a plurality of battery cells 20 are accommodated in the box 11. Figure 2 shows a possible implementation of the box 11 in the embodiment of the present application. As shown in Figure 2, the box 11 may include two parts, here respectively referred to as the first box part 111 and the second box part. part 112, the first box part 111 and the second box part 112 are buckled together. The shapes of the first box part 111 and the second box part 112 may be determined according to the combined shape of the battery module 200 , and at least one of the first box part 111 and the second box part 112 has an opening. For example, as shown in FIG. 2 , the first box part 111 and the second box part 112 can each be a hollow rectangular parallelepiped and each has only one open surface. The opening of the first box part 111 and the second box part The openings of 112 are arranged oppositely, and the first box part 111 and the second box part 112 are interlocked to form the box 11 with a closed chamber.

再例如，不同于图2所示，第一箱体部111和第二箱体部112中可以仅有一个为具有开口的中空长方体，而另一个为板状，以盖合开口。例如，这里以第二箱体部112为中空长方体且只有一个面为开口面，第一箱体部111为板状为例，那么第一箱体部111盖合在第二箱体部112的开口处以形成具有封闭腔室的箱体11，该腔室可以用于容纳多个电池单体20。多个电池单体20相互并联或串联或混联组合后置于第一箱体部111和第二箱体部112扣合后形成的箱体11内。For another example, unlike what is shown in FIG. 2 , only one of the first box part 111 and the second box part 112 may be a hollow rectangular parallelepiped with an opening, and the other may be plate-shaped to cover the opening. For example, here the second box part 112 is a hollow rectangular parallelepiped with only one side open, and the first box part 111 is plate-shaped. Then the first box part 111 is covered with the second box part 112 The opening forms a box 11 with a closed cavity, which can be used to accommodate a plurality of battery cells 20 . A plurality of battery cells 20 are connected in parallel or in series or in a mixed combination and then placed in the box 11 formed by the first box part 111 and the second box part 112 being fastened together.

在一些实施例中，电池10还可以包括其他结构，在此不再一一赘述。例如，该电池10还可以包括汇流部件，汇流部件用于实现多个电池单体20之间的电连接，例如并联或串联或混联。具体地，汇流部件可通过连接电池单体20的电极端子实现电池单体20之间的电连接。进一步地，汇流部件可通过焊接固定于电池单体20的电极端子。多个电池单体20的电能可进一步通过导电机构穿过箱体11而引出。In some embodiments, the battery 10 may also include other structures, which will not be described in detail here. For example, the battery 10 may further include a bus component, which is used to realize electrical connection between multiple battery cells 20 , such as parallel connection, series connection, or mixed connection. Specifically, the bus component can realize electrical connection between the battery cells 20 by connecting the electrode terminals of the battery cells 20 . Furthermore, the bus part may be fixed to the electrode terminal of the battery cell 20 by welding. The electric energy of the plurality of battery cells 20 can be further drawn out through the box 11 through the conductive mechanism.

根据不同的电力需求，电池模块200中的电池单体20的数量可以设置为任意数值。多个电池单体20可通过串联、并联或混联的方式连接以实现较大的容量或功率。由于每个电池10中包括的电池单体20的数量可能较多，为了便于安装，将电池单体20分组设置，每组电池单体20组成电池模块200。电池模块200中包括的电池单体20的数量不限，可以根据需求设置。电池可以包括多个电池模块200，这些电池模块200可通过串联、并联或混联的方式进行连接。According to different power requirements, the number of battery cells 20 in the battery module 200 can be set to any value. Multiple battery cells 20 can be connected in series, parallel or mixed connection to achieve larger capacity or power. Since the number of battery cells 20 included in each battery 10 may be large, in order to facilitate installation, the battery cells 20 are arranged in groups, and each group of battery cells 20 forms a battery module 200 . The number of battery cells 20 included in the battery module 200 is not limited and can be set according to requirements. The battery may include multiple battery modules 200, and the battery modules 200 may be connected in series, parallel or mixed connection.

图3为本申请一个实施例的一种电池单体20的结构示意图，如图3所示，本申请实施例的电池单体20可以包括一个或多个电极组件22以及用于容纳该电极组件22的外壳21。FIG. 3 is a schematic structural diagram of a battery cell 20 according to an embodiment of the present application. As shown in FIG. 3 , the battery cell 20 according to the embodiment of the present application may include one or more electrode assemblies 22 and a device for accommodating the electrode assemblies. 22 for casing 21.

应理解，如图3所示，本申请实施例的外壳21可以为多面体结构。具体地，该外壳21可以包括壳体211和盖板212，其中，该壳体211可以是至少一端形成开口的空心结构，而盖板212的形状可以与壳体211的形状相适配，盖板212用于盖合于壳体211的开口，以使外壳21将电池单体20的内部环境与外部环境隔绝。若壳体211为一端形成开口的空心结构，盖板212则可以设置为一个；若壳体211为相对的两端形成开口的空心结构，盖板212则可以设置为两个，两个盖板212分别盖合于壳体211两端的开口。It should be understood that, as shown in FIG. 3 , the housing 21 of the embodiment of the present application may have a polyhedral structure. Specifically, the housing 21 may include a housing 211 and a cover 212, wherein the housing 211 may be a hollow structure with an opening formed at at least one end, and the shape of the cover 212 may be adapted to the shape of the housing 211. The plate 212 is used to cover the opening of the housing 211 so that the housing 21 isolates the internal environment of the battery cell 20 from the external environment. If the housing 211 is a hollow structure with an opening formed at one end, the number of cover plates 212 may be one; if the housing 211 is a hollow structure with openings formed at opposite ends, the number of the cover plates 212 may be two, and two cover plates may be provided. 212 respectively cover the openings at both ends of the housing 211.

本申请实施例的壳体211的材质可以是多种，比如，铜、铁、铝、钢、铝合金等。盖板212的材质也可以是多种，比如，铜、铁、铝、钢、铝合金等，盖板212的材质与壳体211的材质可以相同，也可以不同。The housing 211 in the embodiment of the present application may be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The cover plate 212 can also be made of a variety of materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The cover plate 212 and the housing 211 can be made of the same material or different.

本申请实施例的外壳21可以是多种形状，比如，圆柱体、长方体等。壳体211和盖板212的形状相互配合，例如，如图3所示，壳体211可以为长方体结构，盖板212为与壳体211相适配的矩形板状结构。The housing 21 in the embodiment of the present application can be in various shapes, such as cylinder, rectangular parallelepiped, etc. The shapes of the housing 211 and the cover 212 match each other. For example, as shown in FIG. 3 , the housing 211 may have a rectangular parallelepiped structure, and the cover 212 may have a rectangular plate structure matching the housing 211 .

为了便于说明，本申请以外壳21为长方体为例。具体地，如图3所示，外壳21包括：壳体211，壳体211为一端开口的中空结构；盖板212，该盖板212用于盖合壳体211的开口，以形成放置电极组件22的封闭的腔体。For ease of explanation, this application takes the housing 21 as a rectangular parallelepiped as an example. Specifically, as shown in FIG. 3 , the housing 21 includes: a housing 211 , which is a hollow structure with one end open; and a cover 212 , which is used to cover the opening of the housing 211 to form a place for placing the electrode assembly. 22 enclosed cavity.

可选地，本申请实施例的外壳21可以设置有多个部件。例如，如图3所示，该电池单体20还可以包括泄压机构213，该泄压机构213可以设置在外壳21的任意一个壁，例如，图3以该泄压机构213位于盖板212上为例。具体地，泄压机构213用于电池单体20的内部压力或温度达到阈值时致动以泄放内部压力或温度。Optionally, the housing 21 of the embodiment of the present application may be provided with multiple components. For example, as shown in FIG. 3 , the battery cell 20 may further include a pressure relief mechanism 213 , which may be disposed on any wall of the housing 21 . For example, in FIG. 3 , the pressure relief mechanism 213 is located on the cover 212 The above is an example. Specifically, the pressure relief mechanism 213 is used to be activated to relieve the internal pressure or temperature when the internal pressure or temperature of the battery cell 20 reaches a threshold.

对于电池10来说，主要的安全危险来自于充电和放电过程，为了提高电池10的安全性能，对电池单体20一般会设置泄压机构213。泄压机构213是指电池单体20的内部压力或温度达到预定阈值时致动以泄放内部压力或温度的元件或部件。该预定阈值可以根据设计需求不同而进行调整。所述预定阈值可取决于电池单体20中的正极极片、负极极片、电解液和隔离膜中一种或几种的材料。泄压机构213可以通过盖板212上的刻痕实现，或者也可以采用诸如对压力敏感或温度敏感的元件或部件，即，当电池单体20的内部压力或温度达到预定阈值时，泄压机构213致动，从而形成可供内部压力或温度泄放的通道。For the battery 10 , the main safety risks come from the charging and discharging processes. In order to improve the safety performance of the battery 10 , a pressure relief mechanism 213 is generally provided on the battery cell 20 . The pressure relief mechanism 213 refers to an element or component that is activated to relieve the internal pressure or temperature when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold. The predetermined threshold can be adjusted according to different design requirements. The predetermined threshold may depend on one or more materials of the positive electrode plate, the negative electrode plate, the electrolyte and the separator in the battery cell 20 . The pressure relief mechanism 213 can be implemented by notches on the cover plate 212 , or it can also use elements or components that are pressure-sensitive or temperature-sensitive, that is, when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold, the pressure relief mechanism 213 can be used. Mechanism 213 is actuated to form a channel through which internal pressure or temperature can be relieved.

本申请中所提到的“致动”是指泄压机构213产生动作，从而使得电池单体20的内部压力及温度得以被泄放。泄压机构213产生的动作可以包括但不限于：泄压机构213中的至少一部分破裂、被撕裂或者熔化，等等。泄压机构213在致动后，电池单体20内部的高温高压物质作为排放物会从泄压机构213向外排出。以此方式能够在可控压力或温度的情况下使电池单体20发生泄压，从而避免潜在的更严重的事故发生。The “actuation” mentioned in this application means that the pressure relief mechanism 213 operates, so that the internal pressure and temperature of the battery cell 20 can be released. The actions generated by the pressure relief mechanism 213 may include, but are not limited to: at least a part of the pressure relief mechanism 213 ruptures, is torn, or melts, and so on. After the pressure relief mechanism 213 is activated, the high-temperature and high-pressure substances inside the battery cells 20 will be discharged outward from the pressure relief mechanism 213 as emissions. In this way, the battery cell 20 can be depressurized under controllable pressure or temperature, thereby avoiding potentially more serious accidents.

本申请中所提到的来自电池单体20的排放物包括但不限于：电解液、被溶解或***的正负极极片、隔离膜的碎片、反应产生的高温高压气体、火焰，等等。The emissions from the battery cells 20 mentioned in this application include but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of the isolation film, high-temperature and high-pressure gases generated by reactions, flames, etc. .

电池单体20上的泄压机构213对电池的安全性有着重要影响。例如，当电池单体20发生短路、过充等现象时，可能会导致电池单体20内部发生热失控从而压力或温度骤升。这种情况下通过泄压机构213致动可以将内部压力及温度向外释放，以防止电池单体20***、起火。The pressure relief mechanism 213 on the battery cell 20 has an important impact on the safety of the battery. For example, when the battery cell 20 is short-circuited or overcharged, thermal runaway may occur inside the battery cell 20 and the pressure or temperature may rise suddenly. In this case, the internal pressure and temperature can be released outward by actuating the pressure relief mechanism 213 to prevent the battery cell 20 from exploding or catching fire.

另外，如图3所示，电池单体20的外壳21的任意一个壁上还可以设置有注液孔215，例如，图3以注液孔215位于盖板212上为例。该注液孔215用于通过该注液孔215向外壳21内部注入电解液。In addition, as shown in FIG. 3 , a liquid injection hole 215 may also be provided on any wall of the housing 21 of the battery cell 20 . For example, in FIG. 3 , the liquid injection hole 215 is located on the cover 212 as an example. The liquid injection hole 215 is used to inject electrolyte into the interior of the housing 21 through the liquid injection hole 215 .

可选地，如图3所示，该外壳21的外表面还可以设置有蓝膜2111，例如，可以设置在壳体211的外表面，以达到绝缘以及保护电池单体20的作用，但本申请实施例并不限于此。Optionally, as shown in FIG. 3 , a blue film 2111 can also be provided on the outer surface of the casing 21 . For example, it can be disposed on the outer surface of the casing 211 to insulate and protect the battery cells 20 . However, this The application embodiment is not limited to this.

在该电池单体20中，壳体211内部用于容纳电极组件22，并且，根据实际使用需求，壳体211内的电极组件22可设置为一个或多个。例如，图3以电池单体20包括沿第一方向X排列的两个电极组件22为例，但本申请实施例并不限于此。其中，第一方向X、第二方向Y和第三方向Z相互垂直。In the battery cell 20 , the interior of the case 211 is used to accommodate the electrode assembly 22 , and according to actual usage requirements, one or more electrode assemblies 22 can be provided in the case 211 . For example, FIG. 3 takes as an example that the battery cell 20 includes two electrode assemblies 22 arranged along the first direction X, but the embodiment of the present application is not limited thereto. Wherein, the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

本申请实施例的电极组件22是电池单体20中发生电化学反应的部件。电极组件22可以是圆柱体、长方体等，若电极组件22为圆柱体结构，壳体211也可以为圆柱体结构，若电极组件22为长方体结构，壳体211也可以为长方体结构。The electrode assembly 22 in the embodiment of the present application is a component in the battery cell 20 that undergoes electrochemical reactions. The electrode assembly 22 can be a cylinder, a rectangular parallelepiped, etc. If the electrode assembly 22 has a cylindrical structure, the housing 211 can also have a cylindrical structure. If the electrode assembly 22 has a rectangular parallelepiped structure, the housing 211 can also have a rectangular parallelepiped structure.

对于任意一个电极组件22，电极组件22可以包括极耳222和主体部分221。具体地，如图3所示，电极组件22可以包括至少两个极耳222，该两个极耳222可以包括正极极耳222a和负极极耳222b，正极极耳222a可以由正极极片上未涂覆正极活性物质层的部分层叠形成，负极极耳222b可以由负极极片上未涂覆负极活性物质层的部分层叠形成。该电极组件22的主体部分221可以由正极极片上涂覆有正极活性物质层的部分和负极极片上涂覆有负极活性物质层的部分层叠形成或者卷绕形成。For any electrode assembly 22 , the electrode assembly 22 may include a tab 222 and a body portion 221 . Specifically, as shown in FIG. 3 , the electrode assembly 22 may include at least two tabs 222 . The two tabs 222 may include a positive tab 222 a and a negative tab 222 b . The positive tab 222 a may be made of an uncoated positive electrode tab. The negative electrode tab 222b may be formed by stacking the portion of the negative electrode plate that is not coated with the negative active material layer. The main body portion 221 of the electrode assembly 22 may be formed by laminating or winding the portion of the positive electrode sheet coated with the positive active material layer and the portion of the negative electrode sheet coated with the negative active material layer.

本申请实施例的外壳21上还设置有电极端子214，电极端子214用于与电极组件22电连接，以输出电池单体20的电能。例如，如图3所示，该电池单体20还可以包括至少两个电极端子214，该两个电极端子214可以设置在盖板212上。盖板212通常是平板形状，两个电极端子214固定在盖板212的平板面上，两个电极端子214分别为正电极端子214a和负电极端子214b。每个电极端子214各对应设置一个连接构件30，连接构件30位于盖板212与电极组件22之间，用于将电极组件22和电极端子214实现电连接。具体地，如图3所示，电极组件22的正极极耳222a可以通过一个连接构件30与正极电极端子214a连接，电极组件22的负极极耳222b通过另一个连接构件30与负极电极端子214b连接。The housing 21 of the embodiment of the present application is also provided with electrode terminals 214 , and the electrode terminals 214 are used to electrically connect with the electrode assembly 22 to output the electric energy of the battery cell 20 . For example, as shown in FIG. 3 , the battery cell 20 may further include at least two electrode terminals 214 , and the two electrode terminals 214 may be disposed on the cover plate 212 . The cover plate 212 is generally in the shape of a flat plate, and two electrode terminals 214 are fixed on the flat surface of the cover plate 212. The two electrode terminals 214 are respectively a positive electrode terminal 214a and a negative electrode terminal 214b. Each electrode terminal 214 is provided with a connecting member 30 corresponding to it. The connecting member 30 is located between the cover plate 212 and the electrode assembly 22 and is used to electrically connect the electrode assembly 22 and the electrode terminal 214 . Specifically, as shown in FIG. 3 , the positive electrode tab 222a of the electrode assembly 22 can be connected to the positive electrode terminal 214a through one connecting member 30, and the negative electrode tab 222b of the electrode assembly 22 can be connected to the negative electrode terminal 214b through another connecting member 30. .

下面将结合附图，对本申请实施例的连接构件30进行详细描述。图4示出了本申请实施例的连接构件30的立体结构示意图，例如，该图4所示的连接构件30可以为电池单体20内的任意连接构件30，这里以该图4所示的连接构件30为图3所示的右侧连接构件30为例；图5示出了本申请实施例的连接构件30的俯视示意图，即图5示出了连接构件30的朝向电极组件22的表面；图6示出了本申请实施例的连接构件30的截面示意图，该截面示意图为图5所示的A-A’方向的截面示意图；图7示出了本申请实施例的连接构件30的侧视示意图，例如，该图7可以为图5所示的连接构件30的左侧的侧视图。The connection member 30 of the embodiment of the present application will be described in detail below with reference to the accompanying drawings. FIG. 4 shows a schematic three-dimensional structural diagram of the connecting member 30 according to the embodiment of the present application. For example, the connecting member 30 shown in FIG. 4 can be any connecting member 30 in the battery cell 20 . Here, the connecting member 30 shown in FIG. 4 is used. The connecting member 30 is the right connecting member 30 shown in FIG. 3 as an example; FIG. 5 shows a top view of the connecting member 30 according to the embodiment of the present application, that is, FIG. 5 shows the surface of the connecting member 30 facing the electrode assembly 22 ; Figure 6 shows a schematic cross-sectional view of the connecting member 30 of the embodiment of the present application, which is a schematic cross-sectional view in the AA' direction shown in Figure 5; Figure 7 shows a schematic cross-sectional view of the connecting member 30 of the embodiment of the present application. Schematic side view, for example, FIG. 7 may be a side view of the left side of the connecting member 30 shown in FIG. 5 .

如图4至图7所示，本申请实施例的该连接构件30用于实现电池单体20的电极端子214与极耳222之间的电连接，该连接构件30包括：电极端子焊接部31、连接部32和主体部33。其中，该连接部32用于连接该电极端子焊接部31和该主体部33，该电极端子焊接部31用于与该电极端子214焊接；该电极端子焊接部31的远离该电极端子214的表面的粗糙度大于该主体部33的远离该电极端子214的表面的粗糙度，该电极端子焊接部31的厚度H31小于该主体部33的厚度H33。As shown in FIGS. 4 to 7 , the connection member 30 in the embodiment of the present application is used to realize the electrical connection between the electrode terminal 214 and the tab 222 of the battery cell 20 . The connection member 30 includes: an electrode terminal welding portion 31 , the connecting part 32 and the main body part 33. The connecting portion 32 is used to connect the electrode terminal welding portion 31 and the main body portion 33 , and the electrode terminal welding portion 31 is used to weld with the electrode terminal 214 ; the surface of the electrode terminal welding portion 31 away from the electrode terminal 214 The roughness is greater than the roughness of the surface of the main body part 33 away from the electrode terminal 214 , and the thickness H31 of the electrode terminal welding part 31 is smaller than the thickness H33 of the main body part 33 .

应理解，本申请实施例的电极端子焊接部31与电极端子214之间可以通过焊接的方式连接。具体地，该焊接方式可以为激光焊接，以保证连接构件30与电极端子214所在的盖板212之间的稳定性和可靠性。It should be understood that the electrode terminal welding portion 31 and the electrode terminal 214 in the embodiment of the present application can be connected by welding. Specifically, the welding method may be laser welding to ensure the stability and reliability between the connecting member 30 and the cover plate 212 where the electrode terminal 214 is located.

因此，本申请实施例的连接构件30，电极端子焊接部31的远离电极端子214的表面的粗糙度大于主体部33的远离电极端子214的表面的粗糙度，这样有利于提高焊接效果。尤其是对于激光焊接，可以通过电极端子焊接部31粗糙表面吸收焊接时的激光能量，减小激光焊接功率，降低生产成本；同时还可避免焊渣出现，提升焊接效果，防止电池单体20内部短路，进而提高电池10的安全性能和品质。Therefore, in the connection member 30 of the embodiment of the present application, the roughness of the surface of the electrode terminal welding portion 31 away from the electrode terminal 214 is greater than the roughness of the surface of the main body 33 away from the electrode terminal 214 , which is beneficial to improving the welding effect. Especially for laser welding, the rough surface of the electrode terminal welding part 31 can absorb the laser energy during welding, reduce the laser welding power, and reduce the production cost; at the same time, it can also avoid the occurrence of welding slag, improve the welding effect, and prevent internal damage of the battery cell 20 short circuit, thereby improving the safety performance and quality of the battery 10.

并且，本申请实施例的电极端子焊接部31的厚度H31小于该主体部33的厚度H33，相比于电极端子焊接部31的厚度H31较大的情况，厚度较小可以使得该焊接部位31熔融穿透性更好，在该连接构件30的电极组件焊接部31与电极端子214之间不出现虚焊的情况下，可以适当降低焊接功率，同时也可以保证焊接效果以及该连接构件30与电极端子214之间的可靠性，也可以保证连接构件30与电极端子214所在的盖板212之间的稳定性和可靠性，进而提高了电池单体20的稳定性和安全性。Moreover, the thickness H31 of the electrode terminal welding part 31 in the embodiment of the present application is smaller than the thickness H33 of the main body part 33. Compared with the case where the thickness H31 of the electrode terminal welding part 31 is larger, the smaller thickness can cause the welding part 31 to melt. The penetrability is better. When no virtual welding occurs between the electrode assembly welding part 31 of the connecting member 30 and the electrode terminal 214, the welding power can be appropriately reduced. At the same time, the welding effect and the connection between the connecting member 30 and the electrode can be ensured. The reliability between the terminals 214 can also ensure the stability and reliability between the connecting member 30 and the cover 212 where the electrode terminals 214 are located, thereby improving the stability and safety of the battery cells 20 .

应理解，本申请实施例的电极端子焊接部31的远离电极端子214的表面的不同区域的粗糙度可以相同或者不同。若电极端子焊接部31的远离电极端子214的表面的不同区域的粗糙度不同，那么本申请实施例的电极端子焊接部31的远离电极端子214的表面的粗糙度可以表示该表面上不同区域的粗糙度的最大值或者平均值或者最小值。类似的，主体部33的远离电极端子214的表面的不同的粗糙度也可以相同或者不同。若主体部33的远离电极端子214的表面的不同区域的粗糙度不同，则本申请实施例的主体部33的远离电极端子214的表面的粗糙度的计算方式与电极端子焊接部31的远离电极端子214的表面的粗糙度的计算方式一致，可以表示该表面上不同区域的粗糙度的最大值或者平均值或者最小值，以使该电极端子焊接部31的远离该电极端子214的表面至少存在部分区域相比于该主体部33的远离该电极端子214的表面更加粗糙。例如，该电极端子焊接部31的远离该电极端子214的表面的粗糙度的平均值，大于该主体部33的远离该电极端子214的表面的粗糙度的平均值，但本申请实施例并不限于此。It should be understood that the roughness of different areas of the surface of the electrode terminal welding portion 31 away from the electrode terminal 214 in the embodiment of the present application may be the same or different. If the roughness of different areas of the surface of the electrode terminal welding portion 31 away from the electrode terminal 214 is different, then the roughness of the surface of the electrode terminal welding portion 31 away from the electrode terminal 214 in the embodiment of the present application can represent different areas on the surface. The maximum, average or minimum value of roughness. Similarly, the different roughnesses of the surface of the main body part 33 away from the electrode terminal 214 may also be the same or different. If the roughness of different areas of the surface of the main body 33 away from the electrode terminal 214 is different, the calculation method of the roughness of the surface of the main body 33 away from the electrode terminal 214 in the embodiment of the present application is the same as that of the electrode terminal welding part 31 away from the electrode. The calculation method of the surface roughness of the terminal 214 is consistent, and can represent the maximum value, average value or minimum value of the roughness in different areas on the surface, so that at least the surface of the electrode terminal welding part 31 away from the electrode terminal 214 has Some areas are rougher than the surface of the main body 33 away from the electrode terminal 214 . For example, the average roughness of the surface of the electrode terminal welding portion 31 away from the electrode terminal 214 is greater than the average roughness of the surface of the main body portion 33 away from the electrode terminal 214 , but the embodiment of the present application does not Limited to this.

应理解，可以通过多种方式增加电极端子焊接部31的远离电极端子214的表面的至少部分区域的粗糙度。例如，可以通过磨砂处理、喷砂处理或溶剂腐蚀的方式，在电极端子焊接部31的远离电极端子214的表面的至少部分区域形成粗糙表面，例如可以如图4至图5所示的电极端子焊接部31表面的矩形颗粒，但本申请实施例并不限于此。It should be understood that the roughness of at least a portion of the surface of the electrode terminal welding portion 31 away from the electrode terminal 214 can be increased in various ways. For example, a rough surface can be formed on at least part of the surface of the electrode terminal welding portion 31 away from the electrode terminal 214 by sanding, sand blasting or solvent etching. For example, the electrode terminal can be as shown in FIGS. 4 to 5 Rectangular particles on the surface of the welding part 31, but the embodiment of the present application is not limited to this.

应理解，本申请实施例的电极端子焊接部31的厚度H31可以为电极端子焊接部31的沿第三方向Z的厚度，该第三方向Z垂直于该电极端子焊接部31的朝向电极端子214的表面，或者说垂直于该电极端子焊接部31的远离电极端子214的表面。类似的，本申请实施例的主体部33的厚度H33也可以为该主体部33的沿第三方向Z的厚度。It should be understood that the thickness H31 of the electrode terminal welding portion 31 in the embodiment of the present application can be the thickness of the electrode terminal welding portion 31 along the third direction Z, and the third direction Z is perpendicular to the direction of the electrode terminal welding portion 31 toward the electrode terminal 214 The surface of the electrode terminal welding portion 31 is perpendicular to the surface of the electrode terminal welding portion 31 and is away from the electrode terminal 214 . Similarly, the thickness H33 of the main body part 33 in the embodiment of the present application may also be the thickness of the main body part 33 along the third direction Z.

本申请实施例的电极端子焊接部31可以设置为不同区域厚度均匀相等，或者也可以设置为厚度不相等。具体地，电极端子焊接部31的不同区域的厚度通常设置为相等，以便于加工。若电极端子焊接部31的不同区域的厚度不相等，例如，仅对该电极端子焊接部31的局部进行减薄处理，则本申请实施例中电极端子焊接部31的厚度H31可以表示电极端子焊接部31的厚度的最大值或者平均值或者最小值，本申请实施例并不限于此。The electrode terminal welding portion 31 in the embodiment of the present application can be set to have uniform and equal thicknesses in different areas, or can also be set to have unequal thicknesses. Specifically, the thicknesses of different areas of the electrode terminal welding portion 31 are generally set to be equal to facilitate processing. If the thickness of different areas of the electrode terminal welding part 31 is not equal, for example, only a part of the electrode terminal welding part 31 is thinned, then the thickness H31 of the electrode terminal welding part 31 in the embodiment of the present application may represent the electrode terminal welding part. The maximum value, the average value, or the minimum value of the thickness of the portion 31 is not limited to this.

类似的，本申请实施例的主体部33的不同区域的厚度也可以设置为相等或者不相等。具体地，主体部33的不同区域的厚度通常设置为相等，以便于加工。若主体部33的不同区域的厚度不相等，则本申请实施例中的主体部33的厚度H33的计算方式应与电极端子焊接部31的一致，该主体部33的厚度H33也可以表示该主体部33的厚度的最大值或者平均值或者最小值。例如，若电极端子焊接部31的不同区域的厚度不同，且主体部33的不同区域的厚度也不同，则电极端子焊接部31的厚度H31可以为该电极端子焊接部31的厚度的最大值，对应的，该主体部33的厚度H33也可以为该主体部33的厚度的最大值，但本申请实施例并不限于此。Similarly, the thickness of different areas of the main body part 33 in the embodiment of the present application can also be set to be equal or unequal. Specifically, the thickness of different areas of the main body portion 33 is usually set to be equal to facilitate processing. If the thickness of different areas of the main body part 33 is not equal, the calculation method of the thickness H33 of the main body part 33 in the embodiment of the present application should be consistent with that of the electrode terminal welding part 31. The thickness H33 of the main body part 33 can also represent the main body. The maximum value, the average value, or the minimum value of the thickness of the portion 33. For example, if the thickness of different areas of the electrode terminal welding portion 31 is different, and the thickness of different areas of the main body portion 33 is also different, the thickness H31 of the electrode terminal welding portion 31 can be the maximum value of the thickness of the electrode terminal welding portion 31, Correspondingly, the thickness H33 of the main body part 33 may also be the maximum value of the thickness of the main body part 33, but the embodiment of the present application is not limited thereto.

在本申请实施例中，该电极端子焊接部31的厚度H31小于该主体部33的厚度H33，二者之间的厚度差值可以根据实际应用进行设置。例如，可以设置电极端子焊接部31的厚度H31与主体部33的厚度H33满足：5％≤(H33-H31)/H33≤65％。再例如，电极端子焊接部31的厚度H31与主体部33的厚度H33的比值的取值范围可以设置为[1/3,11/12]。若该电极端子焊接部31的厚度H31过小，则可能会导致焊接时熔穿该电极端子焊接部31；相反，若该电极端子焊接部31的厚度H31过大，则无法有效降低焊接功率。例如，该电极端子焊接部31的厚度H31与主体部33的厚度H33的比值可以设置为大于或者等于1/2；再例如，该电极端子焊接部31的厚度H31与主体部33的厚度H33的比值可以设置为大于或者等于2/3。In the embodiment of the present application, the thickness H31 of the electrode terminal welding portion 31 is smaller than the thickness H33 of the main body portion 33 , and the thickness difference between the two can be set according to actual applications. For example, the thickness H31 of the electrode terminal welding part 31 and the thickness H33 of the main body part 33 may be set to satisfy: 5%≤(H33-H31)/H33≤65%. For another example, the value range of the ratio of the thickness H31 of the electrode terminal welding part 31 to the thickness H33 of the main body part 33 may be set to [1/3, 11/12]. If the thickness H31 of the electrode terminal welding portion 31 is too small, the electrode terminal welding portion 31 may melt through during welding; conversely, if the thickness H31 of the electrode terminal welding portion 31 is too large, the welding power cannot be effectively reduced. For example, the ratio of the thickness H31 of the electrode terminal welding portion 31 to the thickness H33 of the main body portion 33 can be set to be greater than or equal to 1/2; for another example, the ratio of the thickness H31 of the electrode terminal welding portion 31 to the thickness H33 of the main body portion 33 The ratio can be set to greater than or equal to 2/3.

例如，主体部33的厚度H33为1mm，电极端子焊接部31的厚度H31为0.9mm；或者，主体部33的厚度H33为1.2mm，电极端子焊接部31的厚度H31为1mm；或者，主体部33的厚度H33为1.5mm，电极端子焊接部31的厚度H31为1.2mm或1mm。For example, the thickness H33 of the main body part 33 is 1 mm, and the thickness H31 of the electrode terminal welding part 31 is 0.9 mm. Alternatively, the thickness H33 of the main body part 33 is 1.2 mm, and the thickness H31 of the electrode terminal welding part 31 is 1 mm. Alternatively, the thickness H33 of the main body part 33 is 1 mm. The thickness H33 of the electrode terminal welding part 31 is 1.5 mm, and the thickness H31 of the electrode terminal welding part 31 is 1.2 mm or 1 mm.

在本申请实施例中，电极端子焊接部31的面积也可以根据实际应用进行设置。。具体地，电极端子焊接部31的朝向电极端子的表面的面积与连接构件30的朝向电极端子的表面的面积的比值的取值范围为[1/50,3/5]。可选地，考虑到本申请实施例的电极端子焊接部31可能是局部减薄，因此，可以设置电极端子焊接部31的减薄区域的朝向电极端子的表面的面积与连接构件30的朝向电极端子的表面的面积的比值的取值范围为[1/50,3/5]。若电极端子焊接部31的朝向电极端子214的表面的面积过小，即电极端子焊接部31的减薄区域过小，则不利于焊接，例如，若实际焊接面积超过了减薄区域，则减薄区域并不能有效降低焊接功率，若实际焊接面积等于减薄区域，那么会导致焊接面积过小，进而会导致焊接不稳定。相反的，若电极端子焊接部31的朝向电极端子214的表面的面积过大，即减薄面积过大，由于实际焊接面积有限，过大的减薄面积并不会使得焊接功率显著增加，反而会增加该连接构件30的加工难度，降低生产效率。In the embodiment of the present application, the area of the electrode terminal welding portion 31 can also be set according to actual applications. . Specifically, the ratio of the area of the surface of the electrode terminal welding portion 31 facing the electrode terminal to the area of the surface of the connecting member 30 facing the electrode terminal ranges from [1/50, 3/5]. Optionally, considering that the electrode terminal welding portion 31 of the embodiment of the present application may be partially thinned, the area of the surface of the thinned area of the electrode terminal welding portion 31 facing the electrode terminal and the area of the connecting member 30 facing the electrode may be set The value range of the ratio of the surface area of the terminal is [1/50, 3/5]. If the area of the surface of the electrode terminal welding portion 31 facing the electrode terminal 214 is too small, that is, the thinned area of the electrode terminal welding portion 31 is too small, it is not conducive to welding. For example, if the actual welding area exceeds the thinned area, the thinning area will be reduced. The thin area cannot effectively reduce the welding power. If the actual welding area is equal to the thinned area, the welding area will be too small, which will lead to unstable welding. On the contrary, if the area of the surface of the electrode terminal welding portion 31 facing the electrode terminal 214 is too large, that is, the thinned area is too large, since the actual welding area is limited, the excessively large thinned area will not significantly increase the welding power, but will instead significantly increase the welding power. This will increase the processing difficulty of the connecting member 30 and reduce production efficiency.

可选地，本申请实施例的连接部32位于电极端子焊接部31和主体部33之间，该连接部32也可以进行减薄处理。具体地，如图4至图7所示，连接部32的厚度H32小于主体部33的厚度H33，以便于加工，同时还可以减轻该连接构件30的整体重量，也就减轻了电池单体20的重量。Optionally, the connection part 32 in the embodiment of the present application is located between the electrode terminal welding part 31 and the main body part 33, and the connection part 32 may also be thinned. Specifically, as shown in FIGS. 4 to 7 , the thickness H32 of the connection part 32 is smaller than the thickness H33 of the main body part 33 to facilitate processing and at the same time reduce the overall weight of the connection member 30 , thereby reducing the weight of the battery cell 20 the weight of.

在本申请实施例中，连接部32的厚度H32可以根据实际应用进行设置。例如，连接部32的厚度H32大于电极端子焊接部31的厚度H31，既便于加工实现，也可以保证连接部32的可靠性。In the embodiment of the present application, the thickness H32 of the connecting portion 32 can be set according to actual applications. For example, the thickness H32 of the connecting portion 32 is greater than the thickness H31 of the electrode terminal welding portion 31 , which facilitates processing and ensures the reliability of the connecting portion 32 .

再例如，连接部32的厚度H32与主体部33的厚度H33的比值大于或者等于4/5，以避免该连接部32的厚度H32过小时，该连接构件30结构不稳定。For another example, the ratio of the thickness H32 of the connecting portion 32 to the thickness H33 of the main body portion 33 is greater than or equal to 4/5 to prevent the connecting member 30 from being structurally unstable if the thickness H32 of the connecting portion 32 is too small.

应理解，本申请实施例的电极端子焊接部31和/或连接部32的减薄可以通过多种方式实现，并且，电极端子焊接部31和连接部32的减薄可以通过相同或者不同的方式实现。例如，可以通过相同方式，同时实现电极端子焊接部31和连接部32的减薄，以提高加工效率。例如，可以通过冲压拉伸的方式实现电极端子焊接部31和连接部32的减薄，或者，也可以通过车铣或者墩薄等方式加工实现，本申请实施例并不限于此。It should be understood that the thinning of the electrode terminal welding portion 31 and/or the connecting portion 32 in the embodiment of the present application can be achieved in a variety of ways, and the thinning of the electrode terminal welding portion 31 and the connecting portion 32 can be achieved in the same or different ways. accomplish. For example, the electrode terminal welding portion 31 and the connecting portion 32 can be thinned simultaneously in the same manner to improve processing efficiency. For example, the electrode terminal welding portion 31 and the connecting portion 32 can be thinned by punching and stretching, or can be processed by turning and milling or piercing. The embodiments of the present application are not limited thereto.

应理解，本申请实施例的电极端子焊接部31的朝向电极端子214的表面凸出于或者凹陷于或者齐平于主体部33的朝向电极端子214的表面。可选地，作为一个实施例，如图4至图7所示，电极端子焊接部31的朝向该电极端子214的表面凸出于该主体部33的朝向该电极端子214的表面，使得电极端子焊接部31更加靠近电极端子214，便于实现二者之间的连接。It should be understood that the surface of the electrode terminal welding portion 31 facing the electrode terminal 214 in the embodiment of the present application protrudes, is recessed, or is flush with the surface of the main body portion 33 facing the electrode terminal 214 . Optionally, as an embodiment, as shown in FIGS. 4 to 7 , the surface of the electrode terminal welding portion 31 facing the electrode terminal 214 protrudes from the surface of the main body portion 33 facing the electrode terminal 214 , so that the electrode terminal The welding part 31 is closer to the electrode terminal 214 to facilitate connection between the two.

可选地，本申请实施例的连接部32用于连接主体部33和电极端子焊接部31，本申请实施例的连接部32与主体部33之间的夹角θ可以根据实际加工需要进行设置。具体地，如图4至图7所示，考虑到连接部32与主体部33之间通常设置有圆角，连接部32与电极端子焊接部31之间通常也设置有圆角，以便于加工。因此，本申请实施例的连接部32与主体部33之间的夹角θ是指该连接部32的除去圆角的区域与主体部33的除去圆角的区域之间的夹角。Optionally, the connecting portion 32 in the embodiment of the present application is used to connect the main body portion 33 and the electrode terminal welding portion 31. The angle θ between the connecting portion 32 and the main body portion 33 in the embodiment of the present application can be set according to actual processing needs. . Specifically, as shown in FIGS. 4 to 7 , considering that the connection part 32 and the main body part 33 are usually provided with rounded corners, the connection part 32 and the electrode terminal welding part 31 are also usually provided with rounded corners to facilitate processing. . Therefore, the included angle θ between the connecting portion 32 and the main body portion 33 in the embodiment of the present application refers to the included angle between the area of the connecting portion 32 excluding the rounded corners and the area of the main body portion 33 excluding the rounded corners.

可选地，连接部32与主体部33之间的夹角θ的取值范围为(90°,135°]。具体地，连接部32与主体部33之间的夹角θ也就是加工时的拔模角度θ。该拔模角度θ通常大于90°，以便于脱模；相反的，该拔模角度θ通常也不会设置过大，以免增加加工难度。例如，该连接部32与主体部33之间的夹角θ的取值范围也可以设置为[91°,130°]，但本申请实施例并不限于此。Optionally, the value range of the angle θ between the connection part 32 and the main body part 33 is (90°, 135°]. Specifically, the angle θ between the connection part 32 and the main body part 33 is the angle θ during processing. The draft angle θ. The draft angle θ is usually greater than 90° to facilitate demoulding; on the contrary, the draft angle θ is usually not set too large to avoid increasing the difficulty of processing. For example, the connection part 32 and the main body The value range of the angle θ between the parts 33 can also be set to [91°, 130°], but the embodiment of the present application is not limited thereto.

应理解，如图4至图7所示，主体部33包括极耳焊接区331，极耳焊接区331用于与极耳222焊接，以实现该连接构件30与极耳222之间的连接。具体地，该极耳焊接区331可以为该主体部33的至少部分区域；并且，主体部33可以包括一个连通的极耳焊接区331，或者也可以包括多个相互不连通的极耳焊接区331。例如，图5示出了极耳焊接区331可能的位置，但本申请实施例并不限于此。It should be understood that, as shown in FIGS. 4 to 7 , the main body portion 33 includes a tab welding area 331 , and the tab welding area 331 is used for welding with the tab 222 to realize the connection between the connecting member 30 and the tab 222 . Specifically, the tab welding area 331 may be at least a part of the main body part 33; and the main body part 33 may include one connected tab welding area 331, or may include a plurality of mutually disconnected tab welding areas. 331. For example, FIG. 5 shows possible positions of the tab welding area 331, but the embodiment of the present application is not limited thereto.

可选地，如图4至图7所示，本申请实施例的极耳焊接区331和电极端子焊接部31的相对位置可以根据实际应用设置。例如，极耳焊接区331位于主体部33的远离电极端子焊接部31的一端，以避免极耳焊接区331和电极端子焊接部31之间相互影响，同时也便于加工。Optionally, as shown in FIGS. 4 to 7 , the relative positions of the tab welding area 331 and the electrode terminal welding part 31 in the embodiment of the present application can be set according to actual applications. For example, the tab welding area 331 is located at an end of the main body 33 away from the electrode terminal welding part 31 to avoid mutual influence between the tab welding area 331 and the electrode terminal welding part 31 and to facilitate processing.

可选地，本申请实施例的极耳焊接区331与极耳222之间可以通过焊接实现电连接，例如，可以采用超声波焊接的方式。Optionally, the electrical connection between the tab welding area 331 and the tab 222 in the embodiment of the present application can be achieved by welding, for example, ultrasonic welding can be used.

可选地，如图4至图7所示，该连接构件30的主体部33还可以具有缺口332。例如，可以在主体部333的远离电极端子焊接部31的区域设置缺口332，以去除主体部33的多余材料，进而使连接构件30减重，也就使得电池单体20可以减重，以及电池10减重。Optionally, as shown in FIGS. 4 to 7 , the main body portion 33 of the connecting member 30 may also have a notch 332 . For example, a notch 332 can be provided in the area of the main body 333 away from the electrode terminal welding portion 31 to remove excess material of the main body 33 and thereby reduce the weight of the connecting member 30 , thereby allowing the battery cell 20 to lose weight, as well as the battery. 10. Lose weight.

可选地，如图4至图7所示，该主体部33的缺口332的形状可以为U型，以便于加工。另外，该连接构件30还可以设置有倒角结构333，该倒角结构333可以用于防呆，以便于安装该连接构件30。可选地，该倒角结构333可以设置在该连接构件30的任意一个拐角处，例如，在该U型缺口332的边缘拐角处设置该倒角结构333，或者也可以在其他拐角位置设置该倒角结构333，本申请实施例并不限于此。Optionally, as shown in FIGS. 4 to 7 , the shape of the notch 332 of the main body 33 may be U-shaped to facilitate processing. In addition, the connecting member 30 can also be provided with a chamfered structure 333 , which can be used to prevent fooling and facilitate the installation of the connecting member 30 . Optionally, the chamfer structure 333 can be provided at any corner of the connecting member 30 , for example, the chamfer structure 333 can be provided at the edge corner of the U-shaped notch 332 , or the chamfer structure 333 can also be provided at other corner positions. The chamfer structure 333 is not limited to this embodiment of the present application.

应理解，本申请实施例的电极端子焊接部31的形状和位置可以根据实际应用进行设置。例如，该电极端子焊接部31的形状可以为圆形、矩形或者三角形，以便于加工。再例如，该如图4至图7所示，连接部32环绕电极端子焊接部31，主体部33环绕连接部32，由于主体部33的厚度H33大于电极端子焊接部31的厚度H31，这样环绕设置可以保证该连接构件30的强度，进而保证电池单体20的可靠性。It should be understood that the shape and position of the electrode terminal welding portion 31 in the embodiment of the present application can be set according to actual applications. For example, the shape of the electrode terminal welding portion 31 may be circular, rectangular or triangular to facilitate processing. For another example, as shown in FIGS. 4 to 7 , the connecting portion 32 surrounds the electrode terminal welding portion 31 , and the main body portion 33 surrounds the connecting portion 32 . Since the thickness H33 of the main body portion 33 is greater than the thickness H31 of the electrode terminal welding portion 31 , the surrounding portion 32 surrounds the electrode terminal welding portion 31 . The setting can ensure the strength of the connecting member 30 and thus the reliability of the battery cell 20 .

可选地，不同于如图4至图7所示的连接构件40，本申请实施例的电极端子焊接部31还可以具有其他设置方式。例如，图8示出了本申请另一实施例的电池单体20的分解结构示意图；图9示出了本申请另一实施例的连接构件30的结构示意图，例如，该图9所示的连接构件30可以为电池单体20内的任意连接构件30，这里以该图9所示的连接构件30为图8所示的右侧连接构件30为例；图10示出了本申请另一实施例的连接构件30的俯视示意图，即图10示出了连接构件30的朝向电极组件22的表面；图11示出了本申请另一实施例的连接构件30的侧视示意图，例如，该图11可以为图10所示的连接构件30的下边缘的侧视图。Optionally, different from the connecting member 40 shown in FIGS. 4 to 7 , the electrode terminal welding portion 31 of the embodiment of the present application may also have other arrangements. For example, FIG. 8 shows a schematic exploded structural view of a battery cell 20 according to another embodiment of the present application; FIG. 9 shows a schematic structural view of a connecting member 30 according to another embodiment of the present application. For example, as shown in FIG. 9 The connection member 30 can be any connection member 30 in the battery cell 20. Here, the connection member 30 shown in FIG. 9 is the right connection member 30 shown in FIG. 8 as an example; FIG. 10 shows another example of the present application. A schematic top view of the connecting member 30 of the embodiment, that is, FIG. 10 shows the surface of the connecting member 30 facing the electrode assembly 22; FIG. 11 shows a schematic side view of the connecting member 30 of another embodiment of the present application, for example, this FIG. 11 may be a side view of the lower edge of the connecting member 30 shown in FIG. 10 .

应理解，本申请实施例的图8与图4的区别仅在于连接构件30不同，图8所示的其他部件均适用于图4的相关描述，为了简洁，在此不再赘述。It should be understood that the difference between FIG. 8 and FIG. 4 in the embodiment of the present application is only that the connecting member 30 is different. The other components shown in FIG. 8 are applicable to the relevant description of FIG. 4 and will not be described again for the sake of brevity.

另外，图8至图11所示的连接构件30与图3至图7所示的连接构件30的区别仅在于电极端子焊接部31的形状和位置不同，其余描述均适用于图3至图7所示的连接构件30的相关描述，为了简洁，在此不再赘述。例如，与图3至图7所示的连接构件30类似，图8至图11所示的连接构件30的电极端子焊接部31的朝向该电极端子214的表面也凸出于该主体部33的朝向该电极端子214的表面。In addition, the connection member 30 shown in FIGS. 8 to 11 is different from the connection member 30 shown in FIGS. 3 to 7 only in the shape and position of the electrode terminal welding portion 31. The rest of the description is applicable to FIGS. 3 to 7 The relevant description of the connecting member 30 shown is not repeated here for the sake of brevity. For example, similar to the connecting member 30 shown in FIGS. 3 to 7 , the surface of the electrode terminal welding portion 31 of the connecting member 30 shown in FIGS. 8 to 11 that faces the electrode terminal 214 also protrudes from the main body portion 33 toward the surface of the electrode terminal 214 .

但不同于图3至图7所示的连接构件30，如图8至图11所示的连接构件30的电极端子焊接部31与主体部33分别位于连接部32的相对的两端，这样，更加易于加工，也可以避免电极端子焊接部31与主体部33之间的相互影响。However, unlike the connecting member 30 shown in FIGS. 3 to 7 , the electrode terminal welding portion 31 and the main body portion 33 of the connecting member 30 shown in FIGS. 8 to 11 are located at opposite ends of the connecting portion 32 respectively. In this way, It is easier to process and the mutual influence between the electrode terminal welding part 31 and the main body part 33 can be avoided.

应理解，本申请实施例的电极端子焊接部31的朝向该电极端子214的表面凸出于该主体部33的朝向该电极端子214的表面的情况下，如图3至图11所示，该电极端子焊接部31的远离该电极端子214的表面也可以凸出于该主体部33的朝向该电极端子214的表面；或者，与之不同地，该电极端子焊接部31的远离该电极端子214的表面也可以齐平于该主体部33的远离该电极端子214的表面，本申请实施例并不限于此。It should be understood that when the surface of the electrode terminal welding portion 31 facing the electrode terminal 214 in the embodiment of the present application protrudes from the surface of the main body portion 33 facing the electrode terminal 214, as shown in Figures 3 to 11, the The surface of the electrode terminal welding part 31 away from the electrode terminal 214 may also protrude from the surface of the main body part 33 facing the electrode terminal 214; or, differently, the surface of the electrode terminal welding part 31 away from the electrode terminal 214 The surface of the main body part 33 may also be flush with the surface of the main body part 33 away from the electrode terminal 214 , and the embodiment of the present application is not limited thereto.

可选地，作为另一个实施例，本申请实施例的电极端子焊接部31的朝向该电极端子214的表面也可以凹陷于该主体部33的朝向该电极端子214的表面。具体地，图12示出了本申请再一实施例的电池单体20的分解结构示意图；图13示出了本申请再一实施例的连接构件30的结构示意图，例如，该图13所示的连接构件30可以为电池单体20内的任意连接构件30，这里以该图13所示的连接构件30为图12所示的右侧连接构件30为例。Optionally, as another embodiment, the surface of the electrode terminal welding portion 31 facing the electrode terminal 214 in the embodiment of the present application can also be recessed in the surface of the main body portion 33 facing the electrode terminal 214 . Specifically, FIG. 12 shows a schematic exploded structural view of the battery cell 20 according to yet another embodiment of the present application; FIG. 13 shows a schematic structural view of the connecting member 30 according to yet another embodiment of the present application. For example, as shown in FIG. 13 The connecting member 30 may be any connecting member 30 in the battery cell 20 . Here, the connecting member 30 shown in FIG. 13 is the right connecting member 30 shown in FIG. 12 as an example.

应理解，本申请实施例的图12与图4或者与图8的区别仅在于连接构件30不同，图12所示的其他部件均适用于图4或者图8的相关描述，为了简洁，在此不再赘述。It should be understood that the difference between Fig. 12 in the embodiment of the present application and Fig. 4 or Fig. 8 is only that the connecting member 30 is different. The other components shown in Fig. 12 are applicable to the relevant descriptions in Fig. 4 or Fig. 8. For the sake of simplicity, here No longer.

另外，图12至图13所示的连接构件30与图8至图11所示的连接构件30的区别仅在于：图8至图11中连接构件30的电极端子焊接部31的朝向该电极端子214的表面凸出于该主体部33的朝向该电极端子214的表面，而图12和图13所示的连接构件30的电极端子焊接部31的朝向该电极端子214的表面凹陷于该主体部33的朝向该电极端子214的表面，即电极端子焊接部31与主体部33的相对位置不同。将连接构件30的电极端子焊接部31的朝向该电极端子214的表面设置为凹陷于该主体部33的朝向该电极端子214的表面，可以更加充分的利用电极组件22的主体部分221与电极端子214的朝向主体部分221的表面之间的空间，尤其在电极端子214的朝向主体部分221的表面凸出于所在的盖板212的朝向主体部分221的表面的情况下，电极端子焊接部31的朝向该电极端子214的表面设置为凹陷于该主体部33的朝向该电极端子214的表面，可以提高电池单体20内部的空间利用率。In addition, the connection member 30 shown in FIGS. 12 to 13 is different from the connection member 30 shown in FIGS. 8 to 11 only in that the electrode terminal welding portion 31 of the connection member 30 in FIGS. 8 to 11 is oriented toward the electrode terminal. 214 protrudes from the surface of the main body 33 facing the electrode terminal 214 , while the surface of the electrode terminal welding portion 31 of the connecting member 30 shown in FIGS. 12 and 13 faces the electrode terminal 214 and is recessed in the main body. The surface of 33 facing the electrode terminal 214 , that is, the relative position of the electrode terminal welding portion 31 and the main body portion 33 is different. By arranging the surface of the electrode terminal welding portion 31 of the connecting member 30 facing the electrode terminal 214 to be recessed in the surface of the main body portion 33 facing the electrode terminal 214 , the main body portion 221 and the electrode terminal of the electrode assembly 22 can be more fully utilized. The space between the surfaces of the electrode terminal 214 facing the main body portion 221 , especially when the surface of the electrode terminal 214 facing the main body portion 221 protrudes from the surface of the cover plate 212 facing the main body portion 221 , the electrode terminal welding portion 31 The surface facing the electrode terminal 214 is set to be recessed in the surface of the main body 33 facing the electrode terminal 214 , which can improve the space utilization inside the battery cell 20 .

图12至图13所示的连接构件30的其余描述均适用于图8至图11所示的连接构件30的相关描述，例如，图12至图13中连接构件30的各个区域的厚度设置、粗糙度的设置以及角度的设置等均与图8至图11所示的连接构件30的相同，为了简洁，在此不再赘述。The remaining descriptions of the connecting member 30 shown in FIGS. 12 to 13 are applicable to the related description of the connecting member 30 shown in FIGS. 8 to 11 , for example, the thickness setting of each area of the connecting member 30 in FIGS. 12 to 13 , The settings of roughness and angle are the same as those of the connecting member 30 shown in FIGS. 8 to 11 , and will not be described again for the sake of simplicity.

可选地，在连接构件30的电极端子焊接部31的朝向该电极端子214的表面凹陷于该主体部33的朝向该电极端子214的表面的情况下，如图12和图13所示，电极端子焊接部31的远离该电极端子214的表面也可以凹陷于该主体部33的远离该电极端子214的表面；或者，与之不同地，电极端子焊接部31的远离该电极端子214的表面也可以齐平于该主体部33的远离该电极端子214的表面。Optionally, in the case where the surface of the electrode terminal welding portion 31 of the connecting member 30 facing the electrode terminal 214 is recessed from the surface of the main body portion 33 facing the electrode terminal 214 , as shown in FIGS. 12 and 13 , the electrode The surface of the terminal welding part 31 away from the electrode terminal 214 may also be recessed in the surface of the main body part 33 away from the electrode terminal 214; or, differently, the surface of the electrode terminal welding part 31 away from the electrode terminal 214 may also be recessed. It may be flush with the surface of the main body 33 away from the electrode terminal 214 .

图14示出了本申请再一实施例的连接构件30的结构示意图；图15示出了本申请再一实施例的连接构件30的俯视示意图；图16示出了本申请再一实施例的连接构件30的截面示意图，例如，图16可以为沿图15所示的B-B’方向的截面示意图。若不考虑连接构件30的电极端子焊接部31的厚度减薄，可以设置电极端子焊接部31、连接部32和主体部33为齐平的，即连接构件30可以为均匀平板状结构。这样，在设置连接构件30的电极端子焊接部31的厚度小于主体部33时，可以通过减薄电极端子焊接部31的远离电极端子214的一侧和/或减薄电极端子焊接部31的朝向电极端子214的一侧实现。Figure 14 shows a schematic structural view of the connecting member 30 of yet another embodiment of the present application; Figure 15 shows a schematic top view of the connecting member 30 of yet another embodiment of the present application; Figure 16 shows a schematic view of the connecting member 30 of yet another embodiment of the present application. A schematic cross-sectional view of the connecting member 30 , for example, FIG. 16 may be a schematic cross-sectional view along the BB′ direction shown in FIG. 15 . If the thickness reduction of the electrode terminal welding portion 31 of the connecting member 30 is not considered, the electrode terminal welding portion 31 , the connecting portion 32 and the main body portion 33 can be set flush, that is, the connecting member 30 can have a uniform flat plate structure. In this way, when the thickness of the electrode terminal welding portion 31 of the connecting member 30 is smaller than that of the main body portion 33 , the side of the electrode terminal welding portion 31 away from the electrode terminal 214 and/or the direction of the electrode terminal welding portion 31 can be thinned. One side of the electrode terminal 214 is implemented.

例如，如图14至图16所示，可以对电极端子焊接部31的靠近电极端子214的一侧进行减薄处理，以使电极端子焊接部31的厚度H31小于主体部33的厚度H33，并且减薄过程不会影响位于电极端子焊接部31的远离电极端子214的粗糙表面。其中，如图16所示，连接部32的厚度可以自靠近电极端子焊接部31的一侧向靠近主体部33的一侧逐渐增加，以使电极端子焊接部31至主体部33均匀过渡，便于加工。For example, as shown in FIGS. 14 to 16 , the side of the electrode terminal welding portion 31 close to the electrode terminal 214 can be thinned so that the thickness H31 of the electrode terminal welding portion 31 is smaller than the thickness H33 of the main body portion 33 , and The thinning process will not affect the rough surface located at the electrode terminal welding portion 31 away from the electrode terminal 214 . As shown in FIG. 16 , the thickness of the connecting portion 32 can gradually increase from the side close to the electrode terminal welding portion 31 to the side close to the main body portion 33 , so as to make the transition from the electrode terminal welding portion 31 to the main body portion 33 even and convenient. processing.

可选地，本申请实施例的电极端子焊接部31的面积可以大于或者等于电极端子214与该连接构件30之间实际的焊接区域的面积。例如，如图14至图16所示，可以根据粗糙度划分连接构件30的远离电极端子214的表面上的电极端子焊接部31的区域，但电极端子214与该连接构件30之间实际的焊接区域可以为该电极端子焊接部31的一部分。Alternatively, the area of the electrode terminal welding portion 31 in the embodiment of the present application may be greater than or equal to the area of the actual welding area between the electrode terminal 214 and the connection member 30 . For example, as shown in FIGS. 14 to 16 , the area of the electrode terminal welding portion 31 on the surface of the connecting member 30 away from the electrode terminal 214 may be divided according to roughness, but the actual welding between the electrode terminal 214 and the connecting member 30 The area may be a part of the electrode terminal welding portion 31 .

虽然已经参考优选实施例对本申请进行了描述，但在不脱离本申请的范围的情况下，可以对其进行各种改进并且可以用等效物替换其中的部件。尤其是，只要不存在结构冲突，各个实施例中所提到的各项技术特征均可以任意方式组合起来。本申请并不局限于文中公开的特定实施例，而是包括落入权利要求的范围内的所有技术方案。While the present application has been described with reference to preferred embodiments, various modifications may be made and equivalents may be substituted for components thereof without departing from the scope of the application. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any way. The application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

一种连接构件，其特征在于，所述连接构件用于实现电池单体的电极端子与极耳之间的电连接，所述连接构件包括：电极端子焊接部、连接部和主体部，A connecting member, characterized in that the connecting member is used to realize the electrical connection between the electrode terminal and the tab of the battery cell, and the connecting member includes: an electrode terminal welding part, a connecting part and a main body part,

其中，所述连接部用于连接所述电极端子焊接部和所述主体部，所述电极端子焊接部用于与所述电极端子焊接，所述电极端子焊接部的远离所述电极端子的表面的粗糙度大于所述主体部的远离所述电极端子的表面的粗糙度，所述电极端子焊接部的厚度小于所述主体部的厚度。Wherein, the connecting part is used to connect the electrode terminal welding part and the main body part, the electrode terminal welding part is used to weld with the electrode terminal, and the surface of the electrode terminal welding part away from the electrode terminal The roughness is greater than the roughness of the surface of the main body part away from the electrode terminal, and the thickness of the electrode terminal welding part is smaller than the thickness of the main body part.
根据权利要求1所述的连接构件，其特征在于，所述电极端子焊接部的朝向所述电极端子的表面凸出于或者凹陷于所述主体部的朝向所述电极端子的表面。The connection member according to claim 1, wherein a surface of the electrode terminal welding portion facing the electrode terminal protrudes or is recessed from a surface of the main body portion facing the electrode terminal.
根据权利要求1或2所述的连接构件，其特征在于，所述电极端子焊接部的厚度H31与所述主体部的厚度H33满足：5％≤(H33-H31)/H33≤65％。The connecting member according to claim 1 or 2, wherein the thickness H31 of the electrode terminal welding portion and the thickness H33 of the main body portion satisfy: 5%≤(H33-H31)/H33≤65%.
根据权利要求1至3中任一项所述的连接构件，其特征在于，所述电极端子焊接部的朝向所述电极端子的表面的面积与所述连接构件的朝向所述电极端子的表面的面积的比值的取值范围为[1/50,3/5]。The connecting member according to any one of claims 1 to 3, wherein an area of a surface of the electrode terminal welding portion facing the electrode terminal is equal to an area of a surface of the connecting member facing the electrode terminal. The value range of the area ratio is [1/50,3/5].
根据权利要求1至4中任一项所述的连接构件，其特征在于，所述连接部的厚度小于所述主体部的厚度。The connection member according to any one of claims 1 to 4, characterized in that the thickness of the connection part is smaller than the thickness of the main body part.
根据权利要求5所述的连接构件，其特征在于，所述连接部的厚度大于所述电极端子焊接部的厚度。The connecting member according to claim 5, wherein the thickness of the connecting portion is greater than the thickness of the electrode terminal welding portion.
根据权利要求5或6所述的连接构件，其特征在于，所述连接部的厚度与所述主体部的厚度的比值大于或者等于4/5。The connecting member according to claim 5 or 6, characterized in that the ratio of the thickness of the connecting part to the thickness of the main body part is greater than or equal to 4/5.
根据权利要求1至7中任一项所述的连接构件，其特征在于，所述连接部与所述主体部之间的夹角的取值范围为(90°,135°]。The connecting member according to any one of claims 1 to 7, characterized in that the angle between the connecting part and the main body part ranges from (90°, 135°].
根据权利要求1至8中任一项所述的连接构件，其特征在于，所述主体部包括极耳焊接区，所述极耳焊接区用于与所述极耳焊接。The connection member according to any one of claims 1 to 8, characterized in that the main body part includes a tab welding area, and the tab welding area is used for welding with the tab.
根据权利要求9所述的连接构件，其特征在于，所述极耳焊接区位于所述主体部的远离所述电极端子焊接部的一端。The connecting member according to claim 9, wherein the tab welding area is located at an end of the main body part away from the electrode terminal welding part.
根据权利要求1至10中任一项所述的连接构件，其特征在于，所述主体部的不同区域的厚度相等。The connecting member according to any one of claims 1 to 10, wherein the thickness of different regions of the main body part is equal.
根据权利要求1至11中任一项所述的连接构件，其特征在于，所述连接部环绕所述电极端子焊接部，所述主体部环绕所述连接部。The connecting member according to any one of claims 1 to 11, wherein the connecting portion surrounds the electrode terminal welding portion, and the main body portion surrounds the connecting portion.
一种电池单体，包括：A battery cell including:

电极端子；electrode terminal;

电极组件，所述电极组件包括极耳；An electrode assembly, the electrode assembly includes a tab;

如权利要求1至12中任一项所述连接构件，所述连接构件用于实现所述电极端子与所述极耳之间的电连接。The connecting member according to any one of claims 1 to 12, which is used to realize electrical connection between the electrode terminal and the tab.
一种电池，包括：A battery including:

多个电池单体，所述电池单体包括如权利要求1至12中任一项所述连接构件。A plurality of battery cells, the battery cells including the connecting member according to any one of claims 1 to 12.
一种用电设备，包括：An electrical equipment including:

电池，所述电池用于为所述用电设备提供电能，所述电池包括如权利要求1至12中任一项所述连接构件。A battery, the battery is used to provide electric energy for the electrical equipment, and the battery includes the connecting member according to any one of claims 1 to 12.