Connecting components, battery cells, batteries and power consumption devices

Abstract

Embodiments of this application provide a connecting component, a battery cell, a battery, and a power consumption device. The connecting component is used in a battery cell and includes a bent portion and a connecting portion connected to the bent portion, wherein the connecting portion has a reinforcing structure to make the flexural strength of the connecting portion greater than the flexural strength of the bent portion. By making the flexural strength of the connecting portion greater than the flexural strength of the bent portion of the connecting component, the bent portion is more easily bent than the connecting portion, the amount of offset generated during the bending process of the bending axis of the bent portion is reduced, the connecting component can be smoothly incorporated into the case of the battery cell, and the structural stability of the connecting component can be improved.

Description

Technical Field

[0001] [Cross - Reference to Related Applications] This application claims the priority of Chinese Patent Application No. 202310732611.4, titled "Connection Component, Battery Cell, Battery and Power - Consumption Device", proposed on June 20, 2023, and all the contents of this application are incorporated herein by reference.

[0002] The embodiments of this application relate to the field of battery technology, and in particular, to connection components, battery cells, batteries and power - consumption devices.

Background Art

[0003] Rechargeable batteries have advantages such as high energy density, high power density, a large number of cycle - usage times, and long storage time, so they are widely applied in electric vehicles, mobile installations or various electric tools.

[0004] Currently, when using a connection component to connect the tab of a battery to an electrode terminal, generally, the connection component needs to be bent. Therefore, there are certain limitations on the thickness and hardness of the connection component. During the bending of the connection component, the problem of the fold line shifting easily occurs, making it difficult to attach the electrode assembly to the housing of the battery. If forced to attach, it will damage the connection component, tab and electrode terminal, and further affect the usage performance of the battery.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The embodiments of this application provide a connection component, a battery cell, a battery and a power - consumption device that can reduce the deviation of the bending axis of the bending part of the connection component during the bending process and improve the service life of the battery.

Means for Solving the Problems

[0006] According to a first embodiment, a connecting component for use in a battery cell is provided, the connecting component including a bent portion and a connecting portion connected to the bent portion, wherein the connecting portion has a reinforcing structure to make the flexural strength of the connecting portion greater than the flexural strength of the bent portion.

[0007] In the embodiments of this application, the connecting component includes a connecting portion and a bent portion, the connecting portion being connected to the bent portion, and the connecting portion having a reinforcing structure, and by making the flexural strength of the connecting portion greater than the flexural strength of the bent portion, the bent portion is more easily bent than the connecting portion, the amount of offset generated during the bending process of the bending axis of the bent portion is reduced, and furthermore the connecting component can be smoothly incorporated into the case of the battery cell, the structural stability of the connecting component is improved, and the service life of the battery can be improved.

[0008] In some implementations, the connection includes at least one first structure stacked along a first direction, and this first structure includes this reinforcing structure. Thus, in the embodiments of this application, the connection includes at least one first structure stacked along a first direction, and includes a reinforcing structure on this at least one first structure, thereby improving the flexural strength of the connection and reducing the amount of offset that occurs when the bending axis of the bend of the bend, thereby allowing the connection component to be smoothly incorporated into the case of the battery cell, improving the structural stability of the connection component, and further improving the service life of the battery.

[0009] In some implementations, a projection structure is provided on the surface of the first structure perpendicular to this first direction, and the reinforcing structure includes this projection structure. Thus, in the embodiments of this application, by providing a projection structure on the surface of the first structure perpendicular to this first direction, for example, the projection structure is formed after local pressing, thereby reducing the distance between adjacent first structures, thereby improving the flexural strength of the connection. Furthermore, compared to cases where the projection structure is not provided, the connection is less likely to bend in the region where the projection structure is provided, thereby reducing the amount of offset that occurs during the bending process of the bending axis of the bent portion, allowing the connection component to be smoothly incorporated into the battery cell case, improving the structural stability of the connection component, and further improving the battery's lifespan.

[0010] In some implementations, the connection portion includes multiple layers of this first structure, and the protruding structures of the multiple layers of this first structure protrude in the same direction. Thus, in the embodiments of this application, by making the protruding structures of the multiple layers of this first structure protrude in the same direction, for example by press working the multiple layers of this first structure in the same direction, the bending strength of the connection portion can be further improved, the amount of offset that occurs during the bending process of the bending axis of the bent portion can be reduced, thereby allowing the connection component to be smoothly incorporated into the battery cell case, improving the structural stability of the connection component, and further improving the battery's lifespan.

[0011] In some implementations, the positions of the protruding structures of the multiple layers of this first structure overlap each other. Thus, in the embodiments of this application, by overlapping the positions of the protruding structures of the multiple layers of this first structure, it is possible to press, for example, at least two adjacent regions of the first structure in the multiple layers of the first structure in the same direction by press working, thereby further improving the bending strength of the connection and reducing the amount of offset that occurs during the bending process of the bending axis of the bent portion.

[0012] In some implementations, at least two adjacent layers of this first structure among the multiple layers are connected to each other, and the reinforcing structure includes at least two layers of this first structure that are connected to each other. Thus, in the embodiments of this application, by connecting at least two adjacent layers of this first structure among the multiple layers and bringing the multiple layers of this first structure into close contact with each other by techniques such as welding or bonding, the bending strength of the connection can be improved and the amount of offset that occurs during the bending process of the bending axis of the bent portion can be reduced.

[0013] In some implementations, the connection includes at least one first structure stacked and installed along a first direction, the reinforcing structure being installed on at least one side of the first structure perpendicular to this first direction. Thus, in the embodiments of this application, by installing the reinforcing structure on at least one side of the first structure perpendicular to this first direction, the flexural strength of the first structure is improved, the flexural strength of the connection is further improved, and the amount of offset that occurs during the bending process of the bending axis of the bent portion can be reduced.

[0014] In some implementations, the reinforcing structures are installed on both sides of the first structure perpendicular to this first direction. In this way, the bending strength of the first structure is further improved, the bending strength of the connection is further improved, and the amount of offset that occurs during the bending process of the bending axis of the bent section can be reduced.

[0015] In some implementations, the same reinforcing structure is installed on both sides of the first structure perpendicular to the first direction, and the same reinforcing structure covers the first structure. Thus, in the embodiments of this application, by installing the same reinforcing structure on both sides of the first structure perpendicular to the first direction, and by having the same reinforcing structure cover the first structure, the bending strength of the connection can be greatly improved, and the amount of offset that occurs during the bending process of the bending axis of the bent portion can be reduced.

[0016] In some implementations, the material of this reinforcing structure includes at least one of the following: polypropylene (PP), polyethylene terephthalate (PET), polyethylene (PE), polyvinyl chloride (PVC), polytetrafluoroethylene (PTFE), ethylene-vinyl acetate copolymer (EVA), and rubber.

[0017] In some implementations, the connection portion includes at least one first structure stacked and installed along a first direction, and the bent portion includes at least one second structure stacked and installed along the first direction, wherein the number of layers of the first structure included in the connection portion is equal to the number of layers of the second structure included in the bent portion, thereby facilitating the processing and manufacturing of the connection component and improving the processing efficiency of the battery.

[0018] In some implementations, the connecting component further includes a tab connection end and an electrode terminal connection end, which are connected between the tab connection end and the connecting portion, and between the electrode terminal connection end and the connecting portion, respectively, by the bent portion.

[0019] In some implementations, the tab connection end and the electrode terminal connection end are located at both ends along the second direction of the connection. Thus, in the embodiments of this application, by locating the tab connection end and the electrode terminal connection end at both ends along the second direction of the connection, a certain distance is maintained between the tab connection end and the electrode terminal connection end, reducing the mutual influence between the electrode terminal and the electrode assembly.

[0020] In some implementation manners, the bending direction of this bending portion between this tab connection end and this connection portion is opposite to the bending direction of this bending portion between this electrode terminal connection end and this connection portion. Thus, in the embodiments of the present application, by arranging the bending directions of the bending portions between this tab connection end and this connection portion and between this electrode terminal connection end and this connection portion to be opposite, the space occupied by the connected component after bending in the battery is relatively reduced, and the space inside the battery is saved.

[0021] According to a second aspect, a battery cell is provided, and the battery cell includes the connection component described in any one of the above embodiments.

[0022] According to a third aspect, a battery is provided, and the battery includes the battery cell described in the second aspect or any one of the implementation manners of the second aspect.

[0023] According to a fourth aspect, a power consumption device is provided, and the power consumption device includes the battery described in the third aspect or any one of the implementation manners of the third aspect, and this battery is used to provide electrical energy to this power consumption device.

[0024] In some implementation manners, this power consumption device may be a vehicle, a ship, an aircraft, or the like.

Brief Description of the Drawings

[0025] To more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings that need to be used in the embodiments of the present application. It is self-evident that the drawings described below are only some embodiments of the present application. On the premise that no creative effort is required for those skilled in the art, other drawings can also be obtained based on these drawings. [Figure 1] It is a schematic structural diagram of a vehicle according to an embodiment of the present application. [Figure 2] It is a schematic structural diagram of a battery according to an embodiment of the present application. [Figure 3]It is a schematic diagram of the structure of a battery cell according to an embodiment of the present application. [Figure 4] It is an exploded view of an end cap assembly according to an embodiment of the present application. [Figure 5] It is a schematic diagram of the structure of a connection component according to an embodiment of the present application. [Figure 6] It is a schematic diagram of the structure of another connection component according to an embodiment of the present application. [Figure 7] It is a schematic cross-sectional view of a part of the structure of a connection component according to an embodiment of the present application. [Figure 8] It is a schematic cross-sectional view of a part of the structure of another connection component according to an embodiment of the present application. [Figure 9] It is a schematic cross-sectional view of a part of the structure of another connection component according to an embodiment of the present application. [Figure 10] It is a schematic cross-sectional view of a part of the structure of another connection component according to an embodiment of the present application. [Figure 11] It is a schematic cross-sectional view of a part of the structure of another connection component according to an embodiment of the present application. [Figure 12] It is a schematic cross-sectional view of a part of the structure of another connection component according to an embodiment of the present application. [Figure 13] It is a schematic cross-sectional view of a part of the structure of another connection component according to an embodiment of the present application. [Figure 14] It is a schematic cross-sectional view of a part of the structure of another connection component according to an embodiment of the present application. [Figure 15] It is a schematic cross-sectional view of a part of the structure of another connection component according to an embodiment of the present application. [Figure 16] It is a schematic diagram of the structure of another connection component according to an embodiment of the present application. [Figure 17] It is a schematic diagram of the structure of another connection component according to an embodiment of the present application. [Figure 18] It is a schematic diagram of the structure of another connection component according to an embodiment of the present application.

Mode for Carrying Out the Invention

[0026] To clarify the purpose, technical proposal, and advantages of the embodiments of this application, the following clearly describes the technical proposal in the embodiments of this application, linking it with the drawings of the embodiments. Clearly, the embodiments described are only some, not all, embodiments of this application. All other embodiments obtained based on the embodiments of this application without the creative effort of a person skilled in the art are all within the scope of protection of the embodiments of this application.

[0027] Unless otherwise defined, all technical and scientific terms used in the embodiments of this application have the same meaning as that generally understood by those skilled in the art. The terms used in the specification of this application are solely for the purpose of describing specific embodiments and are not intended to limit this application. The terms “includes” and “has” and any variations thereof in the description of the specification, claims, and drawings of this application are intended to intentionally cover non-exclusive “includes.” Terms such as “first,” “second,” etc., in the specification, claims, or drawings of this application are not intended to describe a particular order or hierarchical relationship, but to distinguish different subjects. “Perpendicular” does not mean strictly perpendicular, but within an error tolerance. “Parallel” does not mean strictly parallel, but within an error tolerance.

[0028] The “Examples” as used in this application mean that certain features, structures, or characteristics described in conjunction with the Examples may be included in at least one Example of this application. The appearance of this phrase at each location in the specification does not necessarily refer to the same Example, nor does it mean that each Example is mutually exclusive or alternative to the others. Those skilled in the art will understand, both explicitly and implicitly, that the Examples described in this application may be combined with other Examples.

[0029] In describing the embodiments of this application, unless otherwise specifically defined or limited, the terms “attachment,” “connection,” “connection,” and “installation” should be understood in a broad sense. For example, these may be fixed connections, detachable connections, or integral connections; direct connections; indirect connections via an intermediate medium; or internal communication between two elements. Those skilled in the art will be able to understand the specific meaning of these terms in the embodiments of this application depending on the specific circumstances.

[0030] The term "and / or" in the embodiments of this application merely describes the relationship between related objects and indicates that three relationships may exist. For example, A and / or B may represent three cases: A alone, a combination of A and B, and B alone. In addition, the character " / " in the embodiments of this application generally indicates that the preceding and succeeding related objects are in an "or" relationship.

[0031] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the dimensions such as thickness, length, and width of various components in the embodiments of this application shown in the drawings, as well as the dimensions such as thickness, length, and width of the overall integrator, are illustrative and should not constitute any limitation to the embodiments of this application.

[0032] A battery is generally a single physical module containing one or more battery cells to provide higher voltage and capacity. For example, this battery may include a battery module or a battery pack. Generally, a battery further includes a housing for packaging one or more battery cells. The housing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0033] In some embodiments, the battery cell may include lithium-ion batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, and the embodiments of this application are not limited thereto. Generally, a battery cell may also be called a battery core. A battery cell may have a cylindrical, flattened, rectangular parallelepiped, or other regular or irregular shape. The technical solutions of the embodiments of this application can be applied to battery cells of any shape, particularly cylindrical battery cells.

[0034] A battery cell comprises an electrode assembly and an electrolyte, the electrode assembly consisting of a positive electrode plate, a negative electrode plate, and a separator. The battery cell operates primarily through the movement of metal ions between the positive and negative electrode plates. The positive electrode plate includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer being coated on the surface of the positive electrode current collector, the current collector without the positive electrode active material layer protruding from the current collector with the positive electrode active material layer, and the current collector without the positive electrode active material layer being called a positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode plate 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. Current collectors without the negative electrode active material layer protrude from current collectors coated with the negative electrode active material layer, and current collectors without the negative electrode active material layer are designated as negative electrode tabs. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon, etc. To ensure that it does not melt even when a large current is passed through it, there are multiple positive electrode tabs and they are stacked, and there are multiple negative electrode tabs and they are stacked. The material of the separator may be polypropylene (PP) or polyethylene (PE), etc. The electrode assembly may have a wound structure or a stacked structure, and the embodiments of this application are not limited to these.

[0035] Currently, during battery installation, connecting components are generally used to connect the battery tabs to the electrode terminals. During use, these connecting components generally need to be bent. However, to facilitate bending, the bent portion of the connecting component cannot be made too thick, and to ensure sufficient current passage area, the bent portion cannot be made too thin. Therefore, these connecting components are generally constructed in a multi-layer sheet structure. If the bending strength of these connecting components is relatively low, problems such as misalignment of the folds during the bending process are likely to occur, making it difficult to attach the electrode assembly to the battery housing. Forcing the attachment can damage the connecting components, tabs, and electrode terminals, affecting their lifespan and, further, impacting the battery's performance.

[0036] Therefore, the embodiment of this application provides a connecting component for use in a battery cell, which includes a bent portion and a connecting portion connected to the bent portion, wherein the connecting portion has a reinforcing structure that makes the bending strength of the connecting portion greater than the bending strength of the bent portion. As a result, the bent portion is made easier to bend than the connecting portion, the amount of offset generated during the bending process of the bending axis of the bent portion is reduced, the connecting component can be smoothly incorporated into the case of the battery cell, and the structural stability of the connecting component can be improved.

[0037] The technical solutions described in the embodiments of this application are applicable to various power consumption devices that use batteries.

[0038] It should be understood that the power consumption devices in the embodiments of this application include, but are not limited to, vehicles, mobile phones, portable devices, laptop computers, steamships, aerospace vehicles, electric toys, and power tools. Vehicles may be fuel-oil vehicles, gas vehicles, or new energy vehicles, and new energy vehicles may be pure electric vehicles, hybrid vehicles, or range-extender vehicles. Aerospace vehicles include airplanes, rockets, space shuttles, and spacecraft. Electric toys include stationary or mobile electric toys, such as game consoles, electric vehicle toys, electric steamship toys, and electric airplane toys. Power tools include metal cutting power tools, polishing power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, hammer drills, concrete vibrators, and electric planers.

[0039] For the sake of explanation, the following embodiments will be described using a vehicle as the power consumption device.

[0040] For example, as shown in Figure 1, this is a schematic diagram of the structure of a vehicle 1 according to one embodiment of this application, where the vehicle 1 may be a fuel oil vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a range extender vehicle. A motor 40, a controller 30, and a battery 10 may be installed inside the vehicle 1, and the controller 30 is for controlling the battery 10 to supply power to the motor 40. For example, the battery 10 may be installed at the bottom, front, or rear of the vehicle 1. The battery 10 may be used to power the vehicle 1, for example, as an operating power source for the vehicle 1, used in the circuit system of the vehicle 1, for example, for starting the vehicle 1, navigation, and operating power consumption requirements during operation. In another embodiment of this application, the battery 10 can provide driving power to the vehicle 1 not only as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, in place of or in place of fuel oil or natural gas.

[0041] For example, Figure 2 is a schematic diagram of the structure of a battery 10 according to an embodiment of this application. The battery 10 may include a plurality of battery cells 20. In addition to the battery cells 20, the battery 10 may further include a housing 11, the interior of which is a hollow structure, and the plurality of battery cells 20 can be housed inside the housing 11. As shown in Figure 2, the housing 11 may include two parts, which are referred to as a first housing portion 111 and a second housing portion 112, respectively, and the first housing portion 111 and the second housing portion 112 are engaged. The shapes of the first housing portion 111 and the second housing portion 112 can be determined according to the shape of the plurality of battery cells 20 combined, and at least one of the first housing portion 111 and the second housing portion 112 has an opening. For example, as shown in Figure 2, one of the first housing portion 111 and the second housing portion 112 is a hollow rectangular parallelepiped with an opening, while the other is a plate-like structure that covers the opening. Here, taking as an example the case where the second housing portion 112 is a hollow rectangular parallelepiped and only one side is an open surface, and the first housing portion 111 is plate-shaped, the first housing portion 111 is placed over the opening of the second housing portion 112 to form a housing 11 having a sealed chamber, and this chamber may be used to house a plurality of battery cells 20. The plurality of battery cells 20 are connected in parallel, in series, or in series-parallel and then placed in the housing 11 formed after the first housing portion 111 and the second housing portion 112 are engaged.

[0042] Furthermore, unlike in Figure 2, for example, the first housing portion 111 and the second housing portion 112 may both be hollow rectangular parallelepipeds, and each may have only one open surface, with the openings of the first housing portion 111 and the second housing portion 112 facing each other, and the first housing portion 111 and the second housing portion 112 engaging with each other to form a housing with a sealed chamber. Multiple battery cells 20 are connected in parallel, in series, or in series-parallel and then placed inside the housing 11 formed after the first housing portion 111 and the second housing portion 112 engage.

[0043] In some implementations, the battery 10 may further include other structures, which are not described here. For example, the battery 10 may further include a busbar member (not shown), which is used to realize electrical connections between multiple battery cells 20, such as parallel, series, or series-parallel connections. Specifically, the busbar member can realize electrical connections between the battery cells 20 by connecting to the electrode terminals of the battery cells 20. In some embodiments, the busbar member can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of the multiple battery cells 20 can further be extracted by passing through a conductive mechanism to the housing. In some embodiments, the conductive mechanism may belong to the busbar member.

[0044] To meet different power consumption demands, the number of battery cells 20 may be multiple, and the multiple battery cells 20 may be connected in series, in parallel, or in series-parallel, where series-parallel connection is a combination of series and parallel connection. The battery 10 may also be called a battery pack. In some embodiments, the multiple battery cells 20 may first be connected in series, in parallel, or in series-parallel to form a battery module, and then the multiple battery modules may be connected in series, in parallel, or in series-parallel to form the battery 10. In other words, the multiple battery cells 20 may directly form the battery 10, or they may first form a battery module, and the battery module may then form the battery 10.

[0045] To facilitate the explanation, the technical proposal of the embodiment of this application will be described below using the cylindrical battery cell 20 shown in Figure 2 as an example. However, it should be understood that the battery cell 20 of the embodiment of this application may be a cylindrical battery cell, or it may include, but is not limited to, a rectangular housing-type battery cell or a blade-type battery cell.

[0046] Figure 3 is a schematic diagram of the structure of a battery cell 20 according to an embodiment of this application. As shown in Figure 3, the battery cell 20 includes a case 210, an electrode assembly 220, and an end cap assembly 230. The case 210 and the end cap assembly 230 form a housing or battery case. The case 210 is made of a metal, for example, aluminum. The shape of the case 210 is determined according to the shape after one or more electrode assemblies 220 are combined. For example, the case 210 may be a hollow cylinder as shown in Figure 3.

[0047] As shown in Figure 3, the case 210 has an opening, the electrode assembly 220 is housed inside the case 210, and the end cap assembly 230 is used to cover this opening and secure the electrode assembly 220 inside the case 210. The case 210 and the end cap assembly 230 provide housing and protection for the electrode assembly 220 and other components. The case 210 is filled with an electrolyte, such as electrolyte solution. The end cap assembly 230 includes a negative electrode end cap assembly 2301 and a positive electrode end cap assembly 2302, which respectively cover the opening of the case 210 from both ends and secure the electrode assembly 220 inside the case 210. The negative electrode end cap assembly 2301 is used to install the negative electrode terminal, and the positive electrode end cap assembly 2302 is used to install the positive electrode terminal. The positive electrode terminal is connected to the positive tab of the electrode assembly 220, and the negative electrode terminal is connected to the negative tab of the electrode assembly 220. The number of positive and negative electrode terminals may be arbitrary. For example, the battery cell 20 may have two positive electrode terminals and two negative electrode terminals, with the two positive electrode terminals mounted on the positive electrode end cap assembly 2302 and the two negative electrode terminals mounted on the negative electrode end cap assembly 2301. The structures of the positive electrode end cap assembly 2302 and the negative electrode end cap assembly 2301 are the same. Hereinafter, the end cap assembly 230 in the embodiments of this application may be either the positive electrode end cap assembly 2302 or the negative electrode end cap assembly 2301.

[0048] Depending on the actual usage requirements, the battery cell 20 may be provided with one or more electrode assemblies 220. For example, as shown in Figure 3, one electrode assembly 220 is installed inside the battery cell 20.

[0049] In some implementations, as shown in Figure 3, if the battery cell 20 is cylindrical, the range of values ​​for the diameter of this cylinder may be [10mm, 100mm]. For example, the diameter of the battery cell 20 may be 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, or its value may be within the range of any two of the above values ​​combined. It should be understood that in some implementations, the range of values ​​for the diameter of this cylinder may be [30mm, 60mm].

[0050] In some implementations, as shown in Figure 3, the range of values ​​for the length of this battery cell 20 may be [20mm, 1000mm]. For example, the length of this battery cell 20 may be 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 200mm, 300mm, 400mm, 500mm, 600mm, 700mm, 800mm, 900mm, 1000mm, or its value may be within the range of any two of the above values ​​combined. In some implementations, the range of values ​​for the length of this battery cell 20 may be [50mm, 500mm].

[0051] Figure 4 shows an exploded view of an end cap assembly 230 according to an embodiment of the present application. As shown in Figure 4, the end cap assembly 230 includes an end cap 233, an electrode terminal 237, and a connecting component 236, the electrode terminal 237 being mounted on the end cap 233, and the connecting component 236 being used to connect the electrode terminal 237 to a tab (not shown) of an electrode assembly 220.

[0052] In some implementations, as shown in Figure 4, a first insulating member 234 is installed between the end cap 233 and the electrode terminal 237, and this first insulating member 234 may be called an underplastic to achieve insulating isolation between the electrode terminal 237 and the end cap 233.

[0053] In some implementations, as shown in Figure 4, the end cap assembly 230 in the battery cell 20 further includes a crimping block 231 for securing electrode terminals 237 that protrude from the end cap 233.

[0054] In some implementations, as shown in Figure 4, the end cap assembly 230 in the battery cell 20 further includes a second insulating member 232, which may also be called an upper plastic, and is used to achieve insulating isolation between the end cap 233 and the crimping block 231.

[0055] In some implementations, as shown in Figure 4, the end cap assembly 230 in the battery cell 20 further includes a seal ring 235 for forming a seal between the electrode terminals 237 and the end cap 233. Exemplarily, the seal ring 235 may be annular in shape and cover the outside of the electrode terminals 237.

[0056] Figure 5 shows a schematic diagram of the structure of a connecting component 236 according to an embodiment of this application. Figure 6 shows a schematic diagram of the structure of another connecting component 236 according to an embodiment of this application.

[0057] It should be understood that, for the sake of convenience, in the embodiments of this application, three directions are defined here, as shown in Figures 5 and 6. The first direction Z may be the thickness direction of the connecting part 236, and this first direction Z is perpendicular to the second direction X and the third direction Y. The second direction X may be the longitudinal direction of the connecting part 236, and this second direction X is perpendicular to the first direction Z and the third direction Y. The third direction Y may be the width direction of the connecting part 236, and this third direction Y is perpendicular to the first direction Z and the second direction X.

[0058] In the embodiments of this application, as shown in Figures 5 and 6, the connecting component 236 includes a connecting portion 2363 and a bent portion 2364 connected to the connecting portion 2363, wherein the connecting portion 2363 has a reinforcing structure 60 to make the flexural strength of the connecting portion 2363 greater than the flexural strength of the bent portion 2364.

[0059] For illustrative purposes, in some implementations, as shown in Figure 5, the connecting component 236 may include one bent portion 2364 and two connecting portions 2363, and as shown in Figure 6, the connecting component 236 may include two bent portions 2364 and one connecting portion 2363. It should be understood that in the embodiments of this application, the number of bent portions 2364 and connecting portions 2363 can be set according to the actual requirements. For the sake of explanation, the embodiments of this application will be described in detail using the connecting component 236 shown in Figure 6 as an example.

[0060] In the embodiment of this application, the connecting component 236 includes a connecting portion 2363 and a bending portion 2364. The connecting portion 2363 is connected to the bending portion 2364, and the connecting portion 2363 has a reinforcing structure 60. By making the bending strength of the connecting portion 2363 greater than that of the bending portion 2364, the bending portion 2364 is more easily bent than the connecting portion 2363. This reduces the amount of offset that occurs when the bending axis 2365 of the bending portion 2364 is bent. Furthermore, the connecting component 236 can be smoothly incorporated into the case 210 of the battery cell 20, improving the structural stability of the connecting component 236 and extending the service life of the battery 10.

[0061] It should be understood that, in embodiments of this application, the connection portion 2363 of the connecting component 236 may include at least one first structure 51 that is stacked along a first direction Z. In some realizations, the connection portion 2363 is a single-layer structure, i.e., the connection portion 2363 includes one first structure 51, which can be manufactured by an integral molding process. In some other realizations, the connection portion 2363 includes multiple first structures 51, which can be stacked along the first direction Z. In some other realizations, the connection portion 2363 includes multiple first structures 51, which can be fixed together by welding or adhesive.

[0062] Furthermore, it should be understood that in the embodiments of this application, the bent portion 2364 of the connecting component 236 may include at least one second structure 52 which is installed in a stack along a first direction Z. In some realizations, the bent portion 2364 is a single-layer structure, i.e., the bent portion 2364 includes one second structure 52, which can be manufactured by an integral molding process. In some other realizations, the bent portion 2364 includes multiple layers of the second structure 52, which can be formed in a stack along the first direction Z. In some other implementations, if the bent portion 2364 includes a multi-layered second structure 52, and does not affect the bending of the bent portion 2364, i.e., if it is ensured that the flexural strength of the connecting portion 2363 is greater than that of the bent portion 2364, then the multi-layered second structure 52 can be locally welded or bonded to facilitate a fixed connection between the bent portion 2364 and the connecting portion 2363, thereby appropriately improving the flexural strength of the bent portion 2364. For example, by welding a portion of the multi-layered second structure 52 in the bent portion 2364, that is, by welding a portion of the second structure 52 at one end or both ends of the bent portion 2364 near the connecting portion 2363 along the second direction X, and leaving the intermediate portion along the second direction X unwelded or unwelded, the bending strength of the bent portion 2364 can be made lower than that of the connecting portion 2363 by allowing the bent portion 2364 to maintain the multi-layered structure in the intermediate portion along the second direction X.

[0063] Furthermore, it should be understood that in the embodiments of this application, the number of layers of the first structure 51 in the connecting portion 2363 and the number of layers of the second structure 52 in the folding portion 2364 may be set to be the same or different.

[0064] In some implementations, when the number of layers of the connecting portion 2363 and the folded portion 2364 are the same as in the embodiment of this application, as shown in Figure 7, for example, Figure 7 shows a schematic cross-sectional view of a part of the structure of a connecting component 236 according to one embodiment of this application, and this connecting component 236 is an integrated structure formed by lamination, that is, the first structure 51 of the connecting portion 2363 and the corresponding second structure 52 of the folded portion 2364 in this connecting component 236 are integrally molded structures, the dotted line in Figure 7 is the boundary line between the connecting portion 2363 and the folded portion 2364 of this connecting component 2366, there is a first gap 53 between two adjacent first structures 51 in the connecting portion 2363, and there is a second gap 54 between two adjacent second structures 52 in the folded portion 2364, and the distance along the first direction Z of the first gap 53 and the second gap 54 is equal. In some other implementations, local welding or local bonding can be performed on two adjacent layers of the first structure 51 in the connecting component 236. For example, the multiple layers of the second structure 52 in the connecting portion 2363 of the connecting component 236 can be welded to further improve the bending strength of the connecting portion 2363. It should be understood that in the embodiments of this application, the number of layers of the connecting component 236 shown in Figure 7 is illustrative only.

[0065] It should be understood that the connecting portion 2363 and the bent portion 2364 in the embodiments of this application may be separate structures. In some implementations, the connecting portion 2363 and the bent portion 2364 in the embodiments of this application may be fixed by welding or adhesive. Specifically, in the embodiments of this application, depending on the actual demand, the connecting portion 2363, which includes at least one layer of a first structure 51, and the bent portion 2364, which includes at least one layer of a second structure 52, may be manufactured, and then the bent portion 2364 and the connecting portion 2363 may be fixedly connected by welding or adhesive. Exemplarily, the connection between the connecting portion 2363 and the bent portion 2364 may be fixed by ultrasonic welding, laser welding, or fusion welding, thereby connecting the connecting portion 2363 and the bent portion 2364 by welding or adhesive in the embodiments of this application, and this connection method is simple and reliable and advantageous in reducing the processing and manufacturing costs of the battery 10.

[0066] Figure 8 shows a schematic cross-sectional view of a part of the structure of a connecting part 236 in an embodiment of the present application. As shown in Figure 8, the connecting portion 2363 in this connecting part 2366 may be a single-layer structure integrally molded, that is, the connecting portion 2363 includes a first structure 51 of one layer, and the bent portion 2364 of this connecting part 2366 is a second structure 52 of six layers stacked along a first direction Z. When manufacturing the connecting part 236, by melt welding one or both ends of this six-layer second structure 52 that are close to the connecting portion 2363 along a second direction X, a molten structure is formed at one or both ends of this multi-layer second structure 52 along the second direction X, and by melt welding the connecting portion 2363 and the bent portion 2364 to form a welded portion 55 at the connection point between the connecting portion 2363 and the bent portion 2364, a fixed connection between the connecting portion 2363 and the bent portion 2364 can be achieved. It should be understood that, in the embodiments of this application, the number of layers in the second structure 52 shown in Figure 8 is illustrative only.

[0067] In some implementations, as shown in Figure 9, Figure 9 shows a schematic cross-sectional view of a part of the structure of another connecting part 236 in an embodiment of the present application, wherein the connecting portion 2363 in this connecting part 2366 may include a three-layer first structure 51, and the bent portion 2364 may include a six-layer second structure 52, and when manufacturing the connecting part 236, the three-layer first structure 51 at one or both ends of the connecting portion 2363 along the second direction X is melt-welded, thereby allowing the one or both ends of the connecting portion 2363 closest to the bent portion 2364 to be welded. A molten structure can be formed, and similarly, by melt-welding the six layers of the second structure 52 at one or both ends of the bent portion 2364 along the second direction X, a molten structure can be formed at one or both ends of the bent portion 2364 near the connection portion 2363, and then by melt-welding the connection portion 2363 and the bent portion 2364 to form a welded portion 55 at the connection point between the connection portion 2363 and the bent portion 2364, a fixed connection between the connection portion 2363 and the bent portion 2364 can be achieved. It should be understood that in the embodiments of this application, the number of layers of the first structure 51 and the second structure 52 shown in Figure 9 are illustrative only. Furthermore, it should be understood that in the embodiments of this application, as shown in Figure 9, the first structure 51 in the connection portion 2363 and the second structure 52 in the bent portion 2364 may be installed in an aligned manner or in a staggered manner.

[0068] In some implementations, as shown in Figure 10, Figure 10 shows a schematic cross-sectional view of a part of the structure of another connecting component 236 in an embodiment of the present application, and this connecting component 236 may be formed by laminating three third structures 2366, with a third gap 56 between two adjacent third structures 2366. Specifically, when manufacturing this third structure 2366, two layers of second structures 52 are melt-welded along a second direction X and at one or both ends near the connecting portion 2363 to form a molten structure at one or both ends near the connecting portion 2363 of these two layers of second structures 52, and then the two layers of second structures 52 formed after melt-welding and the one layer of first structure 51 of the connecting portion 2363 are melt-welded to form a welded portion 55 at the connection point between these two layers of second structures 52 and this one layer of first structure 51, thereby obtaining this third structure 2366. Therefore, the connecting portion 2363 of the resulting connecting part 236 has a three-layer first structure 51, and the folding portion 2364 has a six-layer second structure 52. It should be understood that in the embodiments of this application, the number of layers of the first structure 51 and the second structure 52 shown in Figure 10 are illustrative only.

[0069] In some implementations, as shown in Figure 11, Figure 11 shows a schematic cross-sectional view of a part of the structure of another connecting part 236 in an embodiment of the present application, where the connecting portion 2363 in this connecting part 2366 may be a single-layer structure integrally molded, that is, the connecting portion 2363 includes a first structure 51 of one layer, and the bent portion 2364 of this connecting part 2366 is a second structure 52 of five layers laminated along a first direction Z, and when manufacturing the connecting part 2366, the two adjacent second structures 52 of the bent portion 2364 are bonded together, that is, adhesive is filled into the second gap 54 between adjacent second structures 52, thereby forming an integrated structure of these multiple layers of second structures 52, and then the connecting portion 2363 and the bent portion 2364 are bonded together to form an adhesive portion 57 at the connection point between the connecting portion 2363 and the bent portion 2364, thereby achieving a fixed connection between the connecting portion 2363 and the bent portion 2364. It should be understood that, in the embodiments of this application, the number of layers in the second structure 52 shown in Figure 11 is illustrative only.

[0070] In some implementations, as shown in Figure 12, Figure 12 shows a schematic cross-sectional view of a part of the structure of another connecting component 236 in an embodiment of the present application, wherein the connecting portion 2363 in this connecting component 236 may include a first structure 51 with three layers, and the bent portion 2364 may include a second structure 52 with six layers, and when manufacturing the connecting component 236, the two adjacent layers of the first structure 51 of the connecting portion 2363 are bonded together, that is, adhesive is filled into the first gap 53 between adjacent first structures 51, thereby forming an integrated structure of these multiple layers of first structures 51. Similarly, by bonding the two adjacent layers of the second structure 52 of the bent portion 2364, that is, by filling the second gap 54 between adjacent second structures 52 with adhesive, thereby forming an integrated structure of these multiple layers of second structure 52, and then bonding the connecting portion 2363 and the bent portion 2364, an adhesive portion 57 can be formed at the connection point between the connecting portion 2363 and the bent portion 2364, thereby achieving a fixed connection between the connecting portion 2363 and the bent portion 2364. It should be understood that in the embodiments of this application, the number of layers of the second structure 52 shown in Figure 12 is illustrative only. Furthermore, it should be understood that in the embodiments of this application, as shown in Figure 12, the first structure 51 in the connecting portion 2363 and the second structure 52 in the bent portion 2364 may be installed in an aligned manner or in a staggered manner.

[0071] In some implementations, as shown in Figure 13, Figure 13 shows a schematic cross-sectional view of a part of the structure of another connecting part 236 in an embodiment of the present application, and this connecting part 236 may be formed by laminating three fourth structures 2367, with a third gap 56 between adjacent fourth structures 2367. Specifically, when manufacturing this fourth structure 2367, the two layers of second structures 52 of the bent portion 2364 are bonded together, that is, adhesive is filled into the second gap 54 between adjacent second structures 52, thereby forming an integrated structure of the two layers of second structures 52. Then, the two layers of second structures 52 and the one layer of first structure 51 of the connecting portion 2363 are bonded together, forming an adhesive portion 57 at the connection point between the second structure 52 and the one layer of first structure 51, thereby obtaining the fourth structure 2367. Therefore, the connecting portion 2363 of the resulting connecting part 236 has a three-layer first structure 51, and the folding portion 2364 has a six-layer second structure 52. It should be understood that in the embodiments of this application, the number of layers of the first structure 51 and the second structure 52 shown in Figure 13 are illustrative only.

[0072] In some implementations, as shown in Figure 14, Figure 14 shows a schematic cross-sectional view of a part of the structure of another connecting part 236 in an embodiment of the present application. When manufacturing the connecting part 236 shown in Figure 14, first an integrated structure having a single-layer structure can be obtained. The dotted line in Figure 14 is the boundary line between the connecting part 2363 and the folded part 2364 of this connecting part 236. The first structure 51 and the second structure 52 in this connecting part 236 are an integrated structure, and both the connecting part 2363 and the folded part 2364 in this connecting part 236 are single-layer structures. Subsequently, the single-layer second structure 52 is processed hierarchically to obtain a folded part 2364 having five layers of the second structure 52, with a second gap 54 between two adjacent second structures 52. It should be understood that in the embodiment of the present application, the number of layers of the second structure 52 shown in Figure 14 is illustrative only.

[0073] In some implementations, as shown in Figure 15, Figure 15 shows a schematic cross-sectional view of a part of the structure of another connecting part 236 in an embodiment of the present application, and when manufacturing the connecting part 236 shown in Figure 15, first, a connecting part 236 having three layers of fifth structure 2368 can be formed by lamination, with a third gap 56 between adjacent fifth structures 2368, and the dotted line on each of these fifth structures 2368 is the boundary line between the first structure 51 of the connecting part 2363 and the second structure 52 of the folded part 2364, and then the second structure 52 in each of these fifth structures 2368 is processed hierarchically to obtain a fifth structure 2368 having two layers of second structure 52, with a second gap 54 between two adjacent second structures 52, so that the connecting part 2363 in the obtained connecting part 2366 has three layers of first structure 51 and the folded part 2364 has six layers of second structure 52. It should be understood that, in the embodiments of this application, the number of layers in the first structure 51 and the second structure 52 shown in Figure 15 are illustrative only.

[0074] It should be understood that in some implementations, the range of values ​​for the length of the bent portion 2364 along the first direction Z in the embodiments of this application may be [0.1 mm, 5 mm]. Exemplaryly, the length of the bent portion 2364 along the first direction Z in the embodiments of this application may be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, or the value may be within the range of any two of the above values ​​combined. In some other implementations, the range of values ​​for the length of the bent portion 2364 along the first direction Z in the embodiments of this application may be [0.5 mm, 3 mm].

[0075] It should be understood that in some implementations, the range of values ​​for the length of the connector 2363 along the first direction Z in the embodiments of this application may be [0.1 mm, 5 mm]. Exemplaryly, the length of the connector 2363 along the first direction Z in the embodiments of this application may be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, or the value may be within the range of any two of the above values ​​combined. In some other implementations, the range of values ​​for the length of the connector 2363 along the first direction Z in the embodiments of this application may be [0.5 mm, 3 mm].

[0076] In some implementations, the length of the connecting portion 2363 along the first direction Z in the embodiments of this application may be greater than, equal to, or less than the length of the bending portion 2364 along the first direction Z, and the embodiments of this application are not limited thereto, for example.

[0077] It should be understood that in some implementations, the range of values ​​for the length of the bent portion 2364 along the second direction X in the embodiments of this application may be [1 mm, 10 mm]. Exemplaryly, the length of the bent portion 2364 along the second direction X in the embodiments of this application may be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, or the value may be within the range of any two of the above values ​​combined. In some other implementations, the range of values ​​for the length of the bent portion 2364 along the second direction X in the embodiments of this application may be [3 mm, 7 mm].

[0078] It should be understood that in some implementations, the range of values ​​for the length of the connector 2363 along the second direction X in the embodiments of this application may be [2 mm, 50 mm]. Exemplaryly, the length of the connector 2363 along the second direction X in the embodiments of this application may be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, or the value may be within the range of any two of the above values ​​combined. In some other implementations, the range of values ​​for the length of the connector 2363 along the second direction X in the embodiments of this application may be [5 mm, 20 mm].

[0079] Furthermore, it should be understood that in some implementations, the range of values ​​for the length of the connecting portion 2363 and / or the folded portion 2364 along the third direction Y in the embodiments of this application may be [1 mm, 50 mm]. Exemplaryly, the length of the connecting portion 2363 and / or the folded portion 2364 along the third direction Y in the embodiments of this application may be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, or the value may be within the range of any two of the above values ​​combined. In some other implementations, the range of values ​​for the length of the connecting portion 2363 and / or the folded portion 2364 along the third direction Y in the embodiments of this application may be [5 mm, 20 mm].

[0080] In some implementations, the length of the connecting portion 2363 along the third direction Y may be greater than, equal to, or less than the length of the bending portion 2364 along the third direction Y, and the embodiments of this application are not limited thereto.

[0081] Furthermore, it should be understood that in some implementations, the range of values ​​for the number of layers of the first structure 51 and / or the second structure 52 in the embodiments of this application may be [1,100]. Exemplaryly, the number of layers of the first structure 51 and / or the second structure 52 in the embodiments of this application may be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, or the value may be within the range of any two of the above values ​​combined. In some other implementations, the range of values ​​for the number of layers of the first structure 51 and / or the second structure 52 in the embodiments of this application may be [5,50].

[0082] In some implementations, as shown in Figure 5 or Figure 6, the connection portion 2363 includes at least one first structure 51 stacked along a first direction Z, and this first structure 51 includes the reinforcing structure 60. Thus, in the embodiments of this application, the connection portion 2363 includes multiple first structures 51 stacked along a first direction Z, and by installing the reinforcing structure 60 on these multiple first structures 51, the flexural strength of the connection portion 2363 can be improved, reducing the amount of offset that occurs when the bending axis 2365 of the bent portion 2364 is bent, thereby allowing the connection component 236 to be smoothly incorporated into the case 210 of the battery cell 20, improving the structural stability of the connection component 236, and further improving the service life of the battery 10.

[0083] Figure 16 shows a schematic diagram of the structure of another connecting component 236 according to an embodiment of this application.

[0084] In some implementations, as shown in Figure 16, a projection structure 61 is provided on the surface of the first structure 51 perpendicular to this first direction Z, and the reinforcing structure 60 includes this projection structure 61.

[0085] It should be understood that, in the embodiments of this application, the protruding structure 61 can be obtained by embossing the first multi-layer structure 51. The embossed shape of the protruding structure 61 formed after embossing, perpendicular to the first direction Z, may be circular, square, rhombus, polygonal, etc. Specifically, this embossed shape can be set according to actual needs, and for example, the embodiments of this application are not limited thereto. It should also be understood that the number of protruding structures 61 may be one or more, and for example, the embodiments of this application are not limited thereto.

[0086] In some implementations, the range of values ​​for the length of the projection structure 61 along the first direction Z may be [0.01 mm, 1 mm]. For example, in the embodiments of this application, the length of the projection structure 61 along the first direction Z may be 0.01 mm, 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, or the value may be within the range of any two of the above values ​​combined. In some other implementations, the range of values ​​for the length of the projection structure 61 along the first direction Z may be [0.05 mm, 0.5 mm].

[0087] In some implementations, the range of values ​​for the length of the projection structure 61 along the second direction X may be [1 mm, 70 mm]. For example, in the embodiments of this application, the length of the projection structure 61 along the second direction X may be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, or the value may be within the range of any two of the above values ​​combined. In some other implementations, the range of values ​​for the length of the projection structure 61 along the second direction X may be [5 mm, 50 mm].

[0088] In some implementations, the range of values ​​for the length of the projection structure 61 along the third direction Y may be [1 mm, 50 mm]. For example, in the embodiments of this application, the length of the projection structure 61 along the third direction Y may be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, or the value may be within the range of any two of the above values ​​combined. In some other implementations, the range of values ​​for the length of the projection structure 61 along the third direction Y may be [5 mm, 20 mm].

[0089] As a result, in the embodiments of this application, by installing a projection structure 61 on the surface of the first structure 51 perpendicular to the first direction Z, for example, the projection structure 61 can be formed after local pressing, and by reducing the distance between adjacent first structures 51 in the first direction Z, the bending strength of the connection portion 2363 can be improved by bringing the multiple layers of first structures 51 into close contact. Furthermore, since the projection structure 61 formed by local pressing protrudes from the surface of the first structure 51 perpendicular to the first direction Z, the connection portion 2363 becomes less likely to be bent by the projection structure 61, the amount of offset generated during the bending process of the bending axis 2365 of the bending portion 2364 can be reduced, the connection component 236 can be smoothly incorporated into the case 210 of the battery cell 20, the structural stability of the connection component 236 can be improved, and the service life of the battery 10 can be further improved.

[0090] Furthermore, it should be understood that in the embodiments of this application, the range of the number of layers of the first structure 51 on which the protruding structure 61 is installed may be [2,100]. Exemplaryly, the number of layers of the first structure 51 on which the protruding structure 61 is installed in the embodiments of this application may be 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, or the number may be within the range of any two of the above numbers combined. In some implementations, the range of the number of layers of the first structure 51 on which the protruding structure 61 is installed may be [5,50].

[0091] In some implementations, the connection portion 2363 includes multiple layers of this first structure 51, and the projection structures 61 of the multiple layers of this first structure 51 protrude in the same direction. It should be understood that, in the embodiments of this application, the projection structures 61 of the multiple layers of this first structure 51 protruding in the same direction may mean protruding along one end of the first direction Z. By making the projection structures 61 of the multiple layers of this first structure 51 protrude in the same direction, the bending strength of the connection portion 2363 can be further improved by pressing the multiple layers of this first structure 51 in the same direction, for example by press working, and the amount of offset that occurs during the bending process of the bending axis 2365 of the bent portion 2364 can be reduced, the connection component 236 can be smoothly incorporated into the case 210 of the battery cell 20, the structural stability of the connection component 236 can be improved, and the service life of the battery 10 can be further improved.

[0092] In some implementations, the positions of the protruding structures 61 of the multiple layers of this first structure 51 overlap each other. Thus, in the embodiments of this application, by overlapping the positions of the protruding structures 61 of the multiple layers of this first structure 51, the distance between the multiple layers of this first structure 51 along the first direction Z can be reduced by pressing the same region of the multiple layers of this first structure 51 which are arranged in a continuous line by press working in the same direction, for example, thereby improving the flexural strength of at least a portion of the connecting portion 2363 and improving the flexural strength of the multiple layers of this first structure 51, reducing the amount of offset that occurs during the bending process of the bending axis 2365 of the bent portion 2364, allowing the connecting component 236 to be smoothly incorporated into the case 210 of the battery cell 20, improving the structural stability of the connecting component 236, and further improving the service life of the battery 10.

[0093] In some implementations, at least two adjacent layers of the multi-layered first structure 51 are connected to each other, and the reinforcing structure 60 includes at least two connected layers of the first structure 51. It should be understood that the connection method of interconnecting at least two adjacent layers of the multi-layered first structure 51 in embodiments of this application includes, but is not limited to, ultrasonic welding, laser welding, or bonding. Specifically, when the connection method of interconnecting two adjacent layers of the multi-layered first structure 51 is a welded connection or bonding, the connection area in embodiments of this application is the welded or bonded area between the two adjacent layers of the at least two layers of the first structure 51. It should be understood that the connection area is at least a portion of one or both sides of the surface of the first structure 51 perpendicular to the first direction Z.

[0094] It should be understood that, in the embodiments of this application, the range of values ​​for the length of the connection region along the second direction X may be [1 mm, 70 mm]. Exemplaryly, the length of this connection region along the second direction X in the embodiments of this application may be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, or the value may be within the range of any two of the above values ​​combined. In some realizations, the range of values ​​for the length of the connection region along the second direction X may be [5 mm, 50 mm].

[0095] Furthermore, it should be understood that in the embodiments of this application, the range of values ​​for the length of the connection region along the third direction Y may be [1 mm, 50 mm]. Exemplaryly, the length of this connection region along the third direction Y in the embodiments of this application may be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, or the value may be within the range of any two of the above values ​​combined. In some realizations, the range of values ​​for the length of this connection region along the third direction Y may be [5 mm, 20 mm].

[0096] In this embodiment of the present application, by connecting at least two adjacent layers of the multiple layers of the first structure 51 to each other, the multiple layers of the first structure 51 are brought into close contact, thereby improving the bending strength of the connection portion 2363 and reducing the amount of offset that occurs during the bending process of the bending axis 2365 of the bent portion 2364.

[0097] In some implementations, in the embodiments of this application, if the bent portion 2364 includes multiple layers of this second structure 52, at least two adjacent layers of this second structure 52 among the multiple layers of this second structure 51 of the bent portion 2364 may be connected to each other, and if the flexural strength of the connection 2363 is greater than the flexural strength of the bent portion 2364, the flexural strength of the bent portion 2364 can be appropriately improved, which is advantageous in reducing excessive deformation of the bent portion 2364 during bending, and improves the fatigue resistance of the bent portion 2364.

[0098] Figure 17 shows a schematic diagram of the structure of another connecting component 236 according to an embodiment of this application.

[0099] In some implementations, the connection 2363 includes at least one layer of first structure 51, which is stacked and installed along a first direction Z, and the reinforcing structure 60 is installed on at least one side of the first structure 51 perpendicular to this first direction Z. Exemplarily, the reinforcing structure may include a first reinforcing structure 62, which may be installed on one or both sides of the at least one layer of first structure 51 perpendicular to this first direction Z. Exemplarily, as shown in Figure 17, the connection 2363 may have first reinforcing structures 62 installed at both ends near the bent portion 2364 along a second direction X. Specifically, the number of these first reinforcing structures 62 can be set according to actual requirements.

[0100] It should be understood that, in the embodiments of this application, the range of values ​​for the length of the first reinforcing structure 62 along the first direction Z may be [0.01 mm, 5 mm]. Exemplaryly, the length of the first reinforcing structure 62 along the first direction Z in the embodiments of this application may be 0.01 mm, 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, or the value may be within the range of any two of the above values ​​combined. In some realizations, the range of values ​​for the length of the first reinforcing structure 62 along the first direction Z may be [0.05 mm, 3 mm].

[0101] Furthermore, it should be understood that in the embodiments of this application, the range of values ​​for the length of the first reinforcing structure 62 along the second direction X may be [1 mm, 70 mm]. Exemplaryly, the length of the first reinforcing structure 62 along the second direction X in the embodiments of this application may be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, or the value may be within the range of any two of the above values ​​combined. In some realizations, the range of values ​​for the length of the first reinforcing structure 62 along the second direction X may be [5 mm, 50 mm].

[0102] Furthermore, it should be understood that in the embodiments of this application, the range of values ​​for the length of the first reinforcing structure 62 along the third direction Y may be [1 mm, 60 mm]. Exemplaryly, the length of the first reinforcing structure 62 along the third direction Y in the embodiments of this application may be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, or the value may be within the range of any two of the above values ​​combined. In some realizations, the value of the length of the first reinforcing structure 62 along the third direction Y may be [5 mm, 30 mm].

[0103] As a result, by installing the reinforcing structure 60 on at least one side of the first structure 51 perpendicular to the first direction Z, the bending strength of the first structure 51 can be effectively improved, further improving the bending strength of the connection portion 2363 and reducing the amount of offset that occurs during the bending process of the bending axis 2365 of the bent portion 2364.

[0104] In some implementations, the reinforcing structures 60 are installed on both sides of the first structure 51 perpendicular to the first direction Z, thereby further improving the bending strength of the first structure 51, further improving the bending strength of the connection 2363, and reducing the amount of offset that occurs during the bending process of the bending axis 2365 of the bent portion 2364.

[0105] Figure 18 shows a schematic diagram of the structure of another connecting component 236 according to an embodiment of this application.

[0106] In some implementations, the same reinforcing structures 60 are installed on both sides of the first structure 51 perpendicular to the first direction Z, and these reinforcing structures 60 cover the first structure 51. Exemplarily, as shown in Figure 18, the reinforcing structure 60 for covering the first structure 51 may be a second reinforcing structure 63.

[0107] In some implementations, this second reinforcing structure 63 may be a film structure.

[0108] It should be understood that in the embodiments of this application, the range of values ​​for the thickness of this film structure may be [0.01 mm, 5 mm]. Exemplary examples, the thickness of the film structure in the embodiments of this application may be 0.01 mm, 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, or the value may be within the range of any two of the above values ​​combined. In some realizations, the range of values ​​for the thickness of this film structure may be [0.05 mm, 2 mm].

[0109] Furthermore, it should be understood that the range of values ​​for the length of the film structure along the second direction X in the embodiments of this application may be [1 mm, 100 mm]. Exemplaryly, the length of the film structure along the second direction X in the embodiments of this application may be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, or the value may be within the range of any two of the above values ​​combined. In some realizations, the range of values ​​for the length of the film structure along the second direction X in the embodiments of this application may be [5 mm, 50 mm].

[0110] Furthermore, it should be understood that the range of values ​​for the length of the film structure along the third direction Y in the embodiments of this application may be [1 mm, 70 mm]. Exemplaryly, the length of the film structure along the third direction Y in the embodiments of this application may be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, or the value may be within the range of any two of the above values ​​combined. In some realizations, the range of values ​​for the length of the film structure along the third direction Y in the embodiments of this application may be [5 mm, 30 mm].

[0111] In some implementations, the second reinforcing structure 63 may be a heat-shrinkable tube. Specifically, the heat-shrinkable tube covers at least one of the first structures 51 of the connection portion 2363, and then shrinks by heat treatment, thereby effectively improving the flexural strength of the at least one of the first structures 51 and further improving the flexural strength of the connection portion 2363.

[0112] It should be understood that, in the embodiments of this application, the range of values ​​for the tube thickness of this heat shrink tubing may be [0.01 mm, 5 mm]. Exemplary examples, the tube thickness of the heat shrink tubing in the embodiments of this application may be 0.01 mm, 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, or the value may be within the range of any two of the above values ​​combined. In some implementations, the range of values ​​for the tube thickness of this heat shrink tubing may be [0.05 mm, 2 mm].

[0113] Furthermore, it should be understood that in the embodiments of this application, the range of values ​​for the length of the heat shrink tubing along the second direction X may be [1 mm, 150 mm]. Exemplaryly, the length of the heat shrink tubing along the second direction X in the embodiments of this application may be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, 150 mm, or the value may be within the range of any two of the above values ​​combined. In some realizations, the range of values ​​for the length of the heat shrink tubing along the second direction X may be [5 mm, 100 mm].

[0114] Furthermore, it should be understood that in the embodiments of this application, the range of values ​​for the length of the heat shrink tubing along the third direction Y may be [1 mm, 100 mm]. Exemplaryly, the length of the heat shrink tubing along the third direction Y in the embodiments of this application may be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, or the value may be within the range of any two of the above values ​​combined. In some realizations, the range of values ​​for the length of the heat shrink tubing along the third direction Y may be [5 mm, 50 mm].

[0115] In this embodiment of the present application, by installing the same reinforcing structure 60 on both sides of the first structure 51 perpendicular to the first direction Z, and by having the same reinforcing structure 60 cover the first structure 51, the bending strength of the connection portion 2363 can be greatly improved, and the amount of offset that occurs during the bending process of the bending axis 2365 of the bent portion 2364 can be reduced.

[0116] In some other embodiments, in the embodiments of this application, reinforcing structures 60 are provided on both sides of the first structure 51 perpendicular to the first direction Z, and on both sides of the first structure 51 perpendicular to the third direction Y, thereby significantly improving the bending strength of the connection portion 2363, reducing the amount of offset that occurs when the bending axis 2365 of the bent portion 2364 is bent, further allowing the connection component 236 to be smoothly incorporated into the case 210 of the battery cell 20, improving the structural stability of the connection component 236, and further improving the service life of the battery 10.

[0117] In some implementations, in the embodiments of this application, the material of the reinforcing structure 60 includes at least one of polypropylene (PP), polyethylene terephthalate (PET), polyethylene (PE), polyvinyl chloride (PVC), polytetrafluoroethylene (PTFE), ethylene-vinyl acetate copolymer (EVA), and rubber.

[0118] In some implementations, the connecting portion 2363 includes at least one first structure 51 stacked along a first direction Z, and the folded portion 2364 includes at least one second structure 52 stacked along the first direction Z, wherein the number of layers of the first structure 51 included in the connecting portion 2363 is equal to the number of layers of the second structure 52 included in the folded portion 2364, thereby facilitating the processing and manufacturing of the connecting component 236 and improving the processing efficiency of the battery 10.

[0119] In the embodiments of this application, the flexural strength of the connecting portion 2363 and the bent portion 2364 in the embodiments of this application can be tested by a three-point or four-point bending test, and the three-point bending test will be described below as an example. Specifically, during the test, first, test samples are manufactured, that is, the sample to be measured is processed into five test samples of size 2 mm × 3 mm × 15 mm, and a three-point bending test is performed on these test samples using a universal material testing machine, with a span of 30 mm and a loading rate of 0.5 mm / min, measurements are taken at three positions on each sample, the average value of these three measurements is calculated, and then the average value of the calculated average values ​​for these five test samples is calculated to obtain the flexural strength of the test sample.

[0120] It should be understood that the flexural strength of the connection portion 2363 in the embodiments of this application can be set according to the actual requirements. In some implementations, the flexural strength of the connection portion 2363 in the embodiments of this application may be between 0.04 MPa and 1 MPa. If the flexural strength of the connection portion 2363 is less than 0.04 MPa, i.e., relatively low, bending the connection portion 2363 while bending the connection component 236 causes the position of the bending axis 2365 of the bending portion 2364 to shift, making it difficult to smoothly insert the connection component 236 into the case 210 of the battery cell 20. If the flexural strength of the connection portion 2363 is greater than 1 MPa, i.e., relatively high, it increases the material processing cost. Therefore, the flexural strength of the connection portion 2363 in the embodiments of this application is between 0.04 MPa and 1 MPa.

[0121] For example, the bending strength of this connection 2363 may be 0.04 MPa, 0.05 MPa, 0.06 MPa, 0.07 MPa, 0.08 MPa, 0.09 MPa, 0.1 MPa, 0.2 MPa, 0.3 MPa, 0.4 MPa, 0.5 MPa, 0.6 MPa, 0.7 MPa, 0.8 MPa, 0.9 MPa, or 1 MPa. Alternatively, the value may be within the range of any two of the above values ​​combined.

[0122] Furthermore, it should be understood that the flexural strength of the bent portion 2364 in the embodiments of this application can be set according to the actual requirements. In some implementations, the flexural strength of the bent portion 2364 in the embodiments of this application may be between 0.02 MPa and 0.45 MPa. If the flexural strength of the bent portion 2364 is less than 0.02 MPa, i.e., if the flexural strength of the bent portion 2364 is too low, the position of the bending axis 2365 of the bent portion 2364 will shift during bending of the connecting component 236, making it difficult to smoothly insert the connecting component 236 into the case 210 of the battery cell 20. If the flexural strength of the bent portion 2364 is greater than 0.45 MPa, i.e., if the flexural strength of the bent portion 2364 is relatively high, it will be difficult to bend the bent portion 2364, affecting the use of the connecting component 236. Therefore, the flexural strength of the bent portion 2364 in the embodiment of this application is 0.02 MPa to 0.45 MPa.

[0123] For example, the bending strength of this bent portion 2364 may be 0.02 MPa, 0.03 MPa, 0.04 MPa, 0.05 MPa, 0.06 MPa, 0.07 MPa, 0.08 MPa, 0.09 MPa, 0.1 MPa, 0.15 MPa, 0.2 MPa, 0.25 MPa, 0.3 MPa, 0.35 MPa, 0.4 MPa, or 0.45 MPa. Alternatively, the value may be within the range of any two of the above values ​​combined.

[0124] In some implementations, as shown in Figures 5 to 11, the connecting component 236 further includes an electrode terminal connecting end 2361 and a tab connecting end 2362, which are connected between the tab connecting end 2362 and the connecting portion 2363, and between the electrode terminal connecting end 2361 and the connecting portion 2363, respectively, by the bent portion 2364.

[0125] In some implementations, the tab connector 2362 and the electrode terminal connector 2361 are located at both ends of the connector 2363 along the second direction X. Thus, in the embodiments of this application, by locating the tab connector 2362 and the electrode terminal connector 2361 at both ends of the connector 2363 along the second direction X, a certain distance is maintained between the tab connector 2362 and the electrode terminal connector 2361, reducing the mutual influence between the electrode terminal 237 and the electrode assembly 220.

[0126] In some implementations, the bending direction of the bent portion 2364 between the tab connection end 2362 and the connection portion 2363 is opposite to the bending direction of the bent portion 2364 between the electrode terminal connection end 2361 and the connection portion 2363. For example, if the bending direction of the bent portion 2364 between the tab connection end 2362 and the connection portion 2363 is clockwise, then the bending direction of the bent portion 2364 between the electrode terminal connection end 2361 and the connection portion 2363 is counterclockwise. If the bending direction of the bent portion 2364 between the tab connection end 2362 and the connection portion 2363 is counterclockwise, then the bending direction of the bent portion 2364 between the electrode terminal connection end 2361 and the connection portion 2363 is clockwise.

[0127] As a result, in the embodiment of this application, by setting the bending direction of the bent portion 2364 between the tab connection end 2362 and the connection portion 2363 to be opposite to the bending direction of the bent portion 2364 between the electrode terminal connection end 2361 and the connection portion 2363, the space occupied by the bent connection component 236 inside the battery is relatively small, thereby saving space inside the battery 10.

[0128] In some implementations, if the connector 236 is a negative electrode connector, the material of the connector 236 may be copper. If the connector 236 is a positive electrode connector, the material of the connector 236 may be aluminum.

[0129] In some implementations, one can refer to Figure 16 above, and the embodiment of the present application provides a connecting part 236 in which the number of layers of the first structure 51 of the connecting portion 2363 and the second structure 52 of the folded portion 2364 are both 4 layers, the length of each layer of the first structure 51 and the second structure 52 of each layer along the first direction Z is both 0.15 mm, the length of each layer of the first structure 51 and the second structure 52 along the third direction Y is both 8 mm, and the length of the connecting part 236 along the second direction X is 18 mm. Here, the outer surfaces of the first structure 51 at both ends along the first direction Z of the connecting portion 2363 are embossed, and the outer surface of the first structure 51 may be understood as the surface of the first structure 51 away from the center of the connecting portion 2363. The length of this embossed region along the second direction X is 6 mm, and the length of this embossed region along the third direction Y is 8 mm. For example, this connector 236 can be applied to a battery cell 20 with a diameter of 32 mm and a length of 150 mm.

[0130] In some implementations, one may refer to Figure 17 above, in which an embodiment of the present application provides another connecting part 236, in which the number of layers of the first structure 51 of the connecting part 2363 and the second structure 52 of the bent part 2364 are both 6 layers, the length of each layer of the first structure 51 and the second structure 52 of each layer along the first direction Z is 0.1 mm, and the length of the connecting part 236 along the third direction Y is 18 mm. Along the bending direction of the bent part 2364, the lengths of the second structure 52 along the second direction X, from the second structure 52 closest to the bending axis 2365 of the bent part 2364 to the second structure 52 away from the bending axis 2365, are 26 mm, 28 mm, 29 mm, 30 mm, 31 mm, and 32 mm, respectively. Here, the first structure 51 of this connection part 2363 can be welded, with the length of the welded area along the second direction X being 10 mm and the length of the welded area along the third direction Y being 18 mm. Exemplarily, this connection part 236 can be applied to a battery cell 20 with a diameter of 46 mm and a length of 180 mm.

[0131] In some implementations, one can refer to Figure 17 above, in which an embodiment of the present application provides another connecting component 236, in which the number of layers of the first structure 51 of the connecting portion 2363 and the second structure 52 of the folded portion 2364 in this connecting component 236 is 5 layers, the length of each layer of the first structure 51 and the second structure 52 of each layer along the first direction Z is 0.1 mm, the length of each of the first structure 51 and the second structure 52 along the third direction Y is 10 mm, and the length of the connecting component 236 along the second direction X is 20 mm. Here, patch structures are provided on the outer surfaces of the first structure 51 at both ends along the first direction Z of the connecting portion 2363, and the outer surface of the first structure 51 may be understood as the surface of the first structure 51 away from the center of the connecting portion 2363. The length of the patch structure along the second direction X is 8 mm, and the length of the patch structure along the third direction Y is 12 mm. Along a third direction Y, the patch structure extending beyond the connector 236 can be melted and attached to the connector 236. Exemplarily, this connector 236 can be applied to a battery cell 20 with a diameter of 34 mm and a length of 200 mm.

[0132] In some implementations, referring to Figure 18 above, an embodiment of the present application provides another connecting component 236, in which the number of layers of the first structure 51 of the connecting portion 2363 and the second structure 52 of the folded portion 2364 in this connecting component 236 is 8 layers, the length of each layer of the first structure 51 and each layer of the second structure 52 along the first direction Z is 0.15 mm, the length of the first structure 51 and the second structure 52 along the third direction Y is 30 mm, and the length of this connecting component 236 along the second direction X is 46 mm. Here, patch structures are provided on the outer surfaces of the first structure 51 at both ends along the first direction Z of this connecting portion 2363, and the outer surface of the first structure 51 may be understood as the surface of the first structure 51 away from the center of this connecting portion 2363. The length of this patch structure along the second direction X is 36 mm, and the length of this patch structure along the third direction Y is 28 mm. Subsequently, the connection portion 2363 and the folded portion 2364 of this connecting part 236 are wrapped with an annular wrap film. The thickness of the wrap film formed after wrapping is 0.06 mm, the length of this wrap film along the second direction X is 60 mm, and the length of this wrap film along the third direction Y is 32 mm. Exemplarily, this connecting part 236 can be applied to a battery cell 20 with a diameter of 50 mm and a length of 190 mm.

[0133] In some implementations, referring to Figure 18 above, the embodiment of this application provides another connecting part 236, in which the first structure 51 of the connecting portion 2363 and the second structure 52 of the bent portion 2364 of this connecting part 236 both have 7 layers, the length of each layer of the first structure 51 and the second structure 52 of each layer along the first direction Z is 0.1 mm, the length of each layer of the first structure 51 and the second structure 52 along the third direction Y is 8 mm, and the length of this connecting part 236 along the second direction X is 24 mm. Here, a heat shrink tube is fitted to the connecting portion 2363 of this connecting part 236, the length of this heat shrink tube along the second direction X is 15 mm, and the length of this heat shrink tube along the third direction Y is 12 mm. Specifically, after fitting this heat-shrinkable tube onto the connection part 2363, it is subjected to heat treatment to shrink it and reinforce the bending strength of the connection part 2363. Exemplarily, this connection part 236 can be applied to a battery cell 20 with a diameter of 34 mm and a length of 184 mm.

[0134] It should be noted that, insofar as they do not contradict each other, each embodiment and / or the technical features in each embodiment may be combined with each other as appropriate, and the resulting technical solutions should also be included within the scope of protection of this application.

[0135] This application has been described with reference to the above embodiments, but is subject to various modifications and the replacement of components with equivalents, without departing from the scope of this application. In particular, all technical features mentioned in each embodiment can be combined in any way, provided that there is no structural inconsistency. This application is not limited to the specific embodiments disclosed herein, but includes all technical ideas included in the claims. [Explanation of Symbols]

[0136] 1-Power consumption device, 10-Battery, 20-Battery cell, 30-Controller, 40-Motor, 11-Housing, 111-First housing section, 112-Second housing section, 210-Case, 220-Electrode assembly, 230-End cap assembly, 2301-Negative electrode end cap assembly, 2302-Positive electrode end cap assembly, 231-Crimping block, 232-Second insulating member, 233-End cap, 234-First insulating member, 235-Seal ring, 236-Connecting parts, 237-Electrode terminals, 2361-Electrode terminal connection end, 2362-Tab connection end, 2363-Connection part, 2364-Bending part, 2365-Bending axis, 51-First structure, 52-Second structure, 53-First gap, 54-Second gap, 55-Welded part, 56-Third gap, 57-Adhesive part, 2366-Third structure, 2367-Fourth structure, 2368-Fifth structure, 60-Reinforcement structure, 61-Protrusion structure, 62-First reinforcement structure, 63-Second reinforcement structure.

Claims

1. A connecting component used in a battery cell, wherein the connecting component is The connecting part, Includes a folding portion connected to a connecting portion, The connecting part is characterized in that the connecting part has a reinforcing structure that makes the flexural strength of the connecting part greater than the flexural strength of the bending part.

2. The connecting part according to claim 1, wherein the connecting part includes at least one first structure that is stacked and installed along a first direction, and the first structure includes the reinforcing structure.

3. The connecting component according to claim 2, characterized in that a protruding structure is provided on the surface of the first structure perpendicular to the first direction, and the reinforcing structure includes the protruding structure.

4. The connecting part according to claim 3, wherein the connecting part includes multiple layers of the first structure, and the protruding structures of the multiple layers of the first structure protrude in the same direction.

5. The connecting component according to claim 4, characterized in that the positions of the protruding structures of the multiple layers of the first structure overlap each other.

6. The connecting component according to any one of claims 2 to 5, wherein at least two adjacent layers of the first structure among the multiple layers of the first structure are connected to each other, and the reinforcing structure includes at least two layers of the first structure that are connected to each other.

7. The connecting part according to any one of claims 1 to 6, wherein the connecting part includes at least one first structure that is stacked and installed along a first direction, and the reinforcing structure is installed on at least one side of the first structure perpendicular to the first direction.

8. The connecting component according to claim 7, characterized in that the reinforcing structures are installed on both sides of the first structure perpendicular to the first direction.

9. The connecting component according to claim 8, wherein the same reinforcing structure covering the first structure is installed on both sides of the first structure perpendicular to the first direction.

10. The connecting part according to any one of claims 7 to 9, characterized in that the material of the reinforcing structure includes at least one of polypropylene (PP), polyethylene terephthalate (PET), polyethylene (PE), polyvinyl chloride (PVC), polytetrafluoroethylene (PTFE), ethylene-vinyl acetate copolymer (EVA), and rubber.

11. The connecting part according to any one of claims 1 to 10, characterized in that the connecting part includes at least one first structure stacked and installed along a first direction, the bending part includes at least one second structure stacked and installed along the first direction, and the number of layers of the first structure included in the connecting part is equal to the number of layers of the second structure included in the bending part.

12. The connecting component further includes a tab connection end and an electrode terminal connection end, wherein the tab connection end and the connecting portion, and the electrode terminal connection end and the connecting portion are connected by the bent portion, respectively, as described in any one of claims 1 to 11.

13. The connecting component according to claim 12, characterized in that the tab connecting end and the electrode terminal connecting end are installed at both ends along the second direction of the connecting portion.

14. The connecting component according to claim 13, characterized in that the bending direction of the bent portion between the tab connection end and the connecting portion is opposite to the bending direction of the bent portion between the electrode terminal connection end and the connecting portion.

15. A battery cell characterized by including a connecting component as described in any one of claims 1 to 14.

16. A battery characterized by including the battery cell described in claim 15.

17. A power consumption device characterized by including the battery described in claim 16.

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