Connecting member, battery cell, battery, and power-consuming device

Abstract

The embodiment of the invention provides a connecting component, a battery monomer, a battery and a power utilization device. A connection member for a battery cell, the connection member comprising: a connection portion; the connecting part is connected with the bending part; wherein the connecting part is provided with a reinforcing structure, and the reinforcing structure is used for enabling the bending strength of the connecting part to be larger than that of the bending part. According to the connecting member provided by the embodiment of the invention, the bending strength of the connecting part of the connecting member is greater than that of the bending part of the connecting member, so that the bending part is easier to bend compared with the connecting part, and the offset of the bending axis of the bending part in the bending process is reduced; therefore, the connecting component can be smoothly mounted in the shell of the battery monomer, and the structural stability of the connecting component is improved.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of battery technology, and in particular, to a connecting component, a battery cell, a battery, and an electrical device. Background Art

[0002] Due to the advantages of high energy density, high power density, many cycles and long storage time, rechargeable batteries have been widely used in electric vehicles, mobile devices or various power tools.

[0003] At present, for batteries, when using connecting components to connect the battery's tabs and electrode terminals, the connecting components usually need to be bent, so there are certain restrictions on the thickness and hardness of the connecting components. During the bending process of the connecting components, the crease offset problem is prone to occur, making it difficult to install the electrode assembly into the battery housing. If forced installation is performed, the connecting components, tabs and electrode terminals will be damaged, thereby affecting the performance of the battery. Summary of the invention

[0004] The embodiments of the present application provide a connecting member, a battery cell, a battery and an electrical device, which can reduce the deviation of the bending axis of the bending portion of the connecting member during the bending process and improve the service life of the battery.

[0005] In a first aspect, a connecting member is provided for a battery cell, comprising: a connecting portion; a bending portion, the connecting portion being connected to the bending portion; wherein the connecting portion has a reinforcing structure, the reinforcing structure being used to make the bending strength of the connecting portion greater than the bending strength of the bending portion.

[0006] In an embodiment of the present application, the connecting member includes a connecting portion and a bending portion, the connecting portion is connected to the bending portion, and the connecting portion has a reinforcing structure, so that the bending strength of the connecting portion is greater than the bending strength of the bending portion, so that the bending portion is easier to bend than the connecting portion, so as to reduce the offset of the bending axis of the bending portion during the bending process, so that the connecting member can be smoothly installed into the shell of the battery cell, thereby improving the structural stability of the connecting member and improving the service life of the battery.

[0007] In some implementations, the connection portion includes at least one first structure stacked along the first direction, and the first structure includes the reinforcement structure. Thus, in the embodiment of the present application, the connection portion includes at least one first structure stacked along the first direction, and by including the reinforcement structure on the at least one first structure, the bending strength of the connection portion can be improved to reduce the offset of the bending axis of the bending portion during the bending process, so that the connection member can be smoothly installed in the shell of the battery cell, improve the structural stability of the connection member, and further improve the service life of the battery.

[0008] In some implementations, 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. Thus, in the embodiment of the present application, by providing a protruding structure on the surface of the first structure perpendicular to the first direction, for example, the protruding structure can be formed after local pressing, so that the distance between adjacent first structures is reduced, and the bending strength of the connecting portion can be improved. Secondly, compared with the case where no protruding structure is provided, the connecting portion is difficult to bend in the area where the protruding structure is provided, and the offset of the bending axis of the bending portion during the bending process can be reduced, so that the connecting member can be smoothly installed in the shell of the battery cell, and the structural stability of the connecting member is improved, thereby improving the service life of the battery.

[0009] In some implementations, the connection portion includes multiple layers of the first structure, and the protruding structures of the multiple layers of the first structure protrude in the same direction. Therefore, in the embodiment of the present application, by making the protruding structures of the multiple layers of the first structure protrude in the same direction, for example, the multiple layers of the first structure can be pressed in the same direction by a pressing process, so as to further improve the bending strength of the connection portion, reduce the offset of the bending axis of the bending portion during the bending process, so that the connection member can be smoothly installed in the shell of the battery cell, improve the structural stability of the connection member, and further improve the service life of the battery.

[0010] In some implementations, the positions of the convex structures of the multiple layers of the first structure overlap each other. Therefore, in the embodiment of the present application, by overlapping the positions of the convex structures of the multiple layers of the first structure, for example, the same area of ​​at least two adjacent layers of the multiple layers of the first structure can be pressed in the same direction by a pressing process, so as to further improve the bending strength of the connecting portion, so as to reduce the offset of the bending axis of the bending portion during the bending process.

[0011] In some implementations, at least two adjacent layers of the multi-layer first structure are connected to each other, and the reinforcement structure includes at least two layers of the first structure connected to each other. Therefore, in the embodiment of the present application, by connecting at least two adjacent layers of the multi-layer first structure to each other, such as welding or bonding, the multi-layer first structure is tightly connected, thereby improving the bending strength of the connection part, so as to reduce the offset of the bending axis of the bending part during the bending process.

[0012] In some implementations, the connection portion includes at least one first structure stacked along a first direction, and the reinforcement structure is disposed on at least one side of the first structure perpendicular to the first direction. Thus, in the embodiment of the present application, by disposing the reinforcement structure on at least one side of the first structure perpendicular to the first direction, the bending strength of the first structure can be improved, thereby improving the bending strength of the connection portion, so as to reduce the offset of the bending axis of the bending portion during the bending process.

[0013] In some implementations, the reinforcing structure is disposed on both sides of the first structure perpendicular to the first direction, so as to further improve the bending strength of the first structure and the bending strength of the connecting portion, thereby reducing the offset of the bending axis of the bending portion during the bending process.

[0014] In some implementations, the same reinforcement structure is provided on both sides of the first structure perpendicular to the first direction, and the same reinforcement structure covers the first structure. Therefore, in the embodiment of the present application, by providing the same reinforcement structure on both sides of the first structure perpendicular to the first direction, and the same reinforcement structure covers the first structure, the bending strength of the connecting portion can be significantly improved to reduce the offset of the bending axis of the bending portion during the bending process.

[0015] In some implementations, the material of the 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.

[0016] In some embodiments, the connecting portion includes at least one layer of a first structure stacked along a first direction, the bending portion includes at least one layer of a second structure stacked along the first direction, and the number of layers of the first structure included in the connecting portion is equal to the number of layers of the second structure included in the bending portion, thereby facilitating the processing and manufacturing of the connecting component and improving the processing efficiency of the battery.

[0017] In some implementations, the connection member further includes a tab connection end and an electrode terminal connection end, and the tab connection end and the connection portion are connected via the bending portion, as well as the electrode terminal connection end and the connection portion.

[0018] In some implementations, the tab connection end and the electrode terminal connection end are arranged at two ends of the connection portion along the second direction. Thus, in the embodiment of the present application, by arranging the tab connection end and the electrode terminal connection end at two ends of the connection portion along the second direction, a certain distance exists between the tab connection end and the electrode terminal connection end, thereby reducing the mutual influence between the electrode terminal and the electrode assembly.

[0019] In some implementations, the bending direction of the bent portion between the tab connection end and the connection portion is opposite to the bending direction of the bent portion between the electrode terminal connection end and the connection portion. Thus, in the embodiment of the present application, by setting the bending direction of the bent portion between the tab connection end and the connection portion opposite to the bending direction of the bent portion between the electrode terminal connection end and the connection portion, the bent connection member occupies less space inside the battery, thereby saving space inside the battery.

[0020] In a second aspect, a battery cell is provided, comprising: a connecting component as described in any one of the above embodiments.

[0021] In a third aspect, a battery is provided, comprising the battery cell according to the second aspect or any implementation manner of the second aspect.

[0022] In a fourth aspect, an electrical device is provided, comprising a battery according to the third aspect or any implementation of the third aspect, wherein the battery is used to provide electrical energy to the electrical device.

[0023] In some implementations, the electrical device may be a vehicle, a ship, or a spacecraft. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0025] Figure 1 It is a structural schematic diagram of a vehicle provided in one embodiment of the present application.

[0026] Figure 2 It is a schematic diagram of the structure of a battery provided in one embodiment of the present application.

[0027] Figure 3 It is a structural schematic diagram of a battery cell provided in one embodiment of the present application.

[0028] Figure 4 It is an exploded view of an end cover assembly provided in one embodiment of the present application.

[0029] Figure 5 It is a structural schematic diagram of a connecting component provided in one embodiment of the present application.

[0030] Figure 6 It is a structural schematic diagram of another connecting component provided in one embodiment of the present application.

[0031] Figure 7 It is a cross-sectional schematic diagram of a partial structure of a connecting component provided in one embodiment of the present application.

[0032] Figure 8 It is a cross-sectional schematic diagram of a partial structure of another connecting component provided in one embodiment of the present application.

[0033] Fig. 9 It is a cross-sectional schematic diagram of a partial structure of another connecting component provided in one embodiment of the present application.

[0034] Fig.10 It is a cross-sectional schematic diagram of a partial structure of another connecting component provided in one embodiment of the present application.

[0035] Fig.11 It is a cross-sectional schematic diagram of a partial structure of another connecting component provided in one embodiment of the present application.

[0036] Fig.12 It is a cross-sectional schematic diagram of a partial structure of another connecting component provided in one embodiment of the present application.

[0037] Fig.13 It is a cross-sectional schematic diagram of a partial structure of another connecting component provided in one embodiment of the present application.

[0038] Fig.14 It is a cross-sectional schematic diagram of a partial structure of another connecting component provided in one embodiment of the present application.

[0039] Fig.15 It is a cross-sectional schematic diagram of a partial structure of another connecting component provided in one embodiment of the present application.

[0040] Fig.16 It is a structural schematic diagram of another connecting component provided in one embodiment of the present application.

[0041] Fig.17 It is a structural schematic diagram of another connecting component provided in one embodiment of the present application.

[0042] Fig.18 It is a structural schematic diagram of another connecting component provided in one embodiment of the present application.

[0043] Explanation of reference numerals: 1-electric device; 10-battery; 20-battery cell; 30-controller; 40-motor; 11-housing; 111-first housing portion; 112-second housing portion; 210-housing; 220-electrode assembly; 230-end cap assembly; 2301-negative end cap assembly; 2302-positive end cap assembly; 231-rivet block; 232-second insulating member; 233-end cap; 234-first insulating member; 235-sealing ring; 236-connecting member; 237-electrode Terminal; 2361-electrode terminal connection end; 2362-ear connection end; 2363-connecting portion; 2364-bending portion; 2365-bending axis; 51-first structure; 52-second structure; 53-first gap; 54-second gap; 55-welding portion; 56-third gap; 57-adhesive portion; 2366-third structure; 2367-fourth structure; 2368-fifth structure; 60-reinforcement structure; 61-protruding structure; 62-first reinforcement structure; 63-second reinforcement structure. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the embodiments of the present application.

[0045] Unless otherwise defined, all technical and scientific terms used in the embodiments of the present application have the same meaning as those generally understood by technicians in the technical field of the embodiments of the present application; the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" in the specification and claims of the present application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present application or the above-mentioned figures are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship. "Vertical" is not strictly perpendicular, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0046] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0047] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0048] In the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the embodiments of the present application, the character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0049] In the embodiments of the present 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 thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation on the embodiments of the present application.

[0050] A battery generally refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery may include a battery module or a battery pack. Typically, a battery also includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0051] In some embodiments, the battery cell may include a lithium-ion battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc., which is not limited in the embodiments of the present application. Generally, a battery cell may also be referred to as a battery cell. The battery cell may be cylindrical, flat, rectangular, or other regular or irregular shapes. The technical solution of the embodiments of the present application can be applied to battery cells of any shape, especially cylindrical battery cells.

[0052] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector. The current collector not coated with the positive electrode active material layer protrudes from the current collector coated with the positive electrode active material layer. The current collector not coated with the positive electrode active material layer serves as the positive electrode tab. Taking lithium-ion batteries 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 sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The current collector not coated with the negative electrode active material layer protrudes from the current collector coated with the negative electrode active material layer. The current collector not coated with the negative electrode active material layer serves as the negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon, etc. In order to ensure that a large current can pass without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the isolation film can be polypropylene (PP) or polyethylene (PE). In addition, the electrode assembly can be a winding structure or a laminated structure, and the embodiments of the present application are not limited thereto.

[0053] At present, during the installation of the battery, a connecting member is usually used to connect the battery's tabs and electrode terminals. Since the connecting member usually needs to be bent during use, and in order to facilitate the bending of the connecting member, the bending portion usually cannot be made too thick. At the same time, in order to ensure the flow area of ​​the connecting member, the bending portion cannot be set too thin. Therefore, the connecting member is usually set as a multi-layer sheet structure. When the bending strength of the connecting member is low, the fold offset problem is prone to occur during the bending of the connecting member, making it difficult to install the electrode assembly into the battery housing. If it is forcibly installed, it will cause damage to the connecting member, tabs and electrode terminals, affecting their service life, and further affecting the performance of the battery.

[0054] In view of this, the embodiment of the present application provides a connecting member for a battery cell, comprising: a connecting portion; a bending portion, the connecting portion being connected to the bending portion; wherein the connecting portion has a reinforcing structure, the reinforcing structure being used to make the bending strength of the connecting portion greater than the bending strength of the bending portion. Thus, the bending portion is easier to bend than the connecting portion, so as to reduce the offset of the bending axis of the bending portion during the bending process, thereby enabling the connecting member to be smoothly installed in the housing of the battery cell, thereby improving the structural stability of the connecting member.

[0055] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using batteries.

[0056] It should be understood that the electrical devices in the embodiments of the present application include but are not limited to vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and electric tools, etc. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc.; the spacecraft includes airplanes, rockets, space shuttles, and spacecrafts, etc.; the electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; the electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0057] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0058] For example, Figure 1 As shown, it is a structural schematic diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 40, a controller 30 and a battery 10 may be arranged inside the vehicle 1. The controller 30 is used to control the battery 10 to supply power to the motor 40. For example, a battery 10 may be arranged at the bottom, front or rear of the vehicle 1. The battery 10 may be used to supply power to the vehicle 1. For example, the battery 10 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1. In another embodiment of the present application, the battery 10 may not only be used as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0059] For example, Figure 2 , which is a schematic diagram of the structure of a battery 10 according to an embodiment of the present application. The battery 10 may include a plurality of battery cells 20. In addition to the battery cells 20, the battery 10 may also include a housing 11, the interior of the housing 11 is a hollow structure, and the plurality of battery cells 20 may be accommodated in the housing 11. Figure 2 As shown, the box body 11 may include two parts, which are respectively referred to as a first box body part 111 and a second box body part 112, and the first box body part 111 and the second box body part 112 are buckled together. The shapes of the first box body part 111 and the second box body part 112 may be determined according to the shapes of the combination of multiple battery cells 20, and at least one of the first box body part 111 and the second box body part 112 has an opening. For example, Figure 2As shown, only one of the first box body 111 and the second box body 112 is a hollow cuboid with an opening, and the other is a plate-shaped to cover the opening. Here, taking the second box body 112 as a hollow cuboid with only one face as an opening face, and the first box body 111 as a plate-shaped example, the first box body 111 covers the opening of the second box body 112 to form a box body 11 with a closed chamber, which can be used to accommodate multiple battery cells 20. After the multiple battery cells 20 are connected in parallel, in series or in mixed series, they are placed in the box body 11 formed by the first box body 111 and the second box body 112 being buckled together.

[0060] For example, unlike Figure 2 As shown, the first box body 111 and the second box body 112 can both be hollow cuboids and each have only one open face, the opening of the first box body 111 and the opening of the second box body 112 are arranged opposite to each other, and the first box body 111 and the second box body 112 are buckled together to form a box with a closed chamber. A plurality of battery cells 20 are connected in parallel, in series or in mixed series and are placed in the box 11 formed by the first box body 111 and the second box body 112 being buckled together.

[0061] In some implementations, the battery 10 may also include other structures, which are not described one by one here. For example, the battery 10 may also include a busbar component (not shown in the figure), which is used to realize electrical connection between multiple battery cells 20, such as parallel, series or mixed connection. Specifically, the busbar component can realize electrical connection between the battery cells 20 by connecting the electrode terminals of the battery cells 20. In some embodiments, the busbar component can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of multiple battery cells 20 can be further led out through the conductive mechanism through the box. In some embodiments, the conductive mechanism may also belong to the busbar component.

[0062] In order to meet different power requirements, the number of battery cells 20 can be multiple, and multiple battery cells 20 can be connected in series, in parallel, or in mixed connection, where mixed connection refers to a mixture of series and parallel connection. The battery 10 can also be called a battery pack. In some embodiments, multiple battery cells 20 can first be connected in series, in parallel, or in mixed connection to form a battery module, and multiple battery modules can then be connected in series, in parallel, or in mixed connection to form a battery 10. In other words, multiple battery cells 20 can directly form a battery 10, or they can first form a battery module, and then the battery module can form a battery 10.

[0063] For the sake of explanation, the following Figure 2 The cylindrical battery cell 20 is taken as an example to illustrate the technical solution of the embodiment of the present application. However, it should be understood that the battery cell 20 of the embodiment of the present application can be a cylindrical battery cell, including but not limited to a square shell battery cell or a blade battery cell.

[0064] Figure 3 FIG. 2 is a schematic diagram of the structure of a battery cell 20 according to an embodiment of the present application. Figure 3 As shown, the battery cell 20 includes a housing 210, an electrode assembly 220, and an end cap assembly 230. The housing 210 and the end cap assembly 230 form a housing or a battery box. The housing 210 is formed of metal, such as aluminum. The housing 210 is determined according to the shape of one or more electrode assemblies 220. For example, the housing 210 can be Figure 3 The hollow cylinder shown.

[0065] like Figure 3 As shown, the shell 210 has an opening, the electrode assembly 220 is accommodated in the shell 210, and the end cap assembly 230 is used to cover the opening to cover the electrode assembly 220 in the shell 210. The shell 210 and the end cap assembly 230 are used to accommodate and protect the electrode assembly 220 and other components. The shell 210 is filled with an electrolyte, such as an electrolyte. The end cap assembly 230 includes a negative end cap assembly 2301 and a positive end cap assembly 2302, and the negative end cap assembly 2301 and the positive end cap assembly 2302 cover the opening of the shell 210 from both ends of the shell 210 respectively to cover the electrode assembly 220 in the shell 210. The negative electrode terminal is used to set the negative electrode terminal, and the positive electrode terminal is used to set the positive electrode terminal. The positive electrode terminal is connected to the positive electrode ear of the electrode assembly 220, and the negative electrode terminal is connected to the negative electrode ear of the electrode assembly 220. The positive electrode terminal and the negative electrode terminal may have any number, for example, the battery cell 20 may have two positive electrode terminals and two negative electrode terminals, the two positive electrode terminals are arranged on the positive end cap assembly 2302, and the two negative electrode terminals are arranged on the negative end cap assembly 2301. The positive end cap assembly 2302 has the same structure as the negative end cap assembly 2301. In the following, the end cap assembly 230 in the embodiment of the present application may be the positive end cap assembly 2302 or the negative end cap assembly 2301.

[0066] In the battery cell 20, the electrode assembly 220 can be provided as a single electrode or multiple electrodes according to actual use requirements, for example, Figure 3 As shown, an electrode assembly 220 is disposed in the battery cell 20 .

[0067] In some implementations, such as Figure 3As shown, when the battery cell 20 is a cylinder, the diameter of the cylinder may be in the range of [10 mm, 100 mm]. For example, the diameter of the battery cell 20 may be set to 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, or a value within the range obtained by combining any two of the above values. It should be understood that in some implementations, the diameter of the cylinder may also be in the range of [30 mm, 60 mm].

[0068] In some implementations, such as Figure 3 As shown, the length of the battery cell 20 may range from [20 mm, 1000 mm]. For example, the length of the battery cell 20 may be set to 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 200 mm, 300 mm, 400 mm, 500 mm, 600 mm, 700 mm, 800 mm, 900 mm, 1000 mm, or a value within the range obtained by combining any two of the above values. In some implementations, the length of the battery cell 20 may also range from [50 mm, 500 mm].

[0069] Figure 4 FIG. 2 shows an exploded view of an end cap assembly 230 provided in an embodiment of the present application. Figure 4 As shown, the end cap assembly 230 includes an end cap 233, an electrode terminal 237 and a connecting member 236. The electrode terminal 237 is arranged on the end cap 233, and the connecting member 236 is used to connect the electrode terminal 237 and the electrode ear of the electrode assembly 220 (not shown in the figure).

[0070] In some implementations, such as Figure 4 As shown, a first insulating member 234 is provided between the end cover 233 and the electrode terminal 237 . The first insulating member 234 may also be referred to as lower plastic, and is used to achieve insulation isolation between the electrode terminal 237 and the end cover 233 .

[0071] In some implementations, such as Figure 4 As shown, the end cover assembly 230 in the battery cell 20 further includes a rivet block 231 , and the rivet block 231 is used to fix the electrode terminal 237 protruding from the end cover 233 .

[0072] In some implementations, such as Figure 4 As shown, the end cap assembly 230 in the battery cell 20 further includes a second insulating member 232 , which may also be referred to as an upper plastic, and is used to achieve insulation isolation between the end cap 233 and the riveting block 231 .

[0073] In some implementations, such as Figure 4 As shown, the end cap assembly 230 in the battery cell 20 further includes a sealing ring 235 for forming a seal between the electrode terminal 237 and the end cap 233. Exemplarily, the sealing ring 235 may be provided in a ring shape and cover the outer side of the electrode terminal 237.

[0074] Figure 5 A schematic structural diagram of a connecting member 236 provided in an embodiment of the present application is shown. Figure 6 A schematic structural diagram of another connecting member 236 provided in an embodiment of the present application is shown.

[0075] It should be understood that in the embodiments of the present application, for the convenience of description, three directions are defined here, such as Figure 5 and Figure 6 As shown, the first direction Z may be the thickness direction of the connecting member 236, and the first direction Z is perpendicular to the second direction X and the third direction Y; the second direction X may be the length direction of the connecting member 236, and the 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 member 236, and the third direction Y is perpendicular to the first direction Z and the second direction X.

[0076] In the embodiments of the present application, Figure 5 and Figure 6 As shown, the connecting member 236 includes: a connecting portion 2363; a bending portion 2364, wherein the connecting portion 2363 is connected to the bending portion 2364; wherein the connecting portion 2363 has a reinforcing structure 60, and the reinforcing structure is used to make the bending strength of the connecting portion 2363 greater than the bending strength of the bending portion 2364.

[0077] For example, in some implementations, Figure 5 As shown, the connecting member 236 includes a bending portion 2364 and two connecting portions 2363; Figure 6 As shown, the connecting member 236 may include two bending portions 2364 and one connecting portion 2363. It should be understood that in the embodiment of the present application, the number of the bending portions 2364 and the connecting portion 2363 can be set according to actual needs. Figure 6 The connecting member 236 shown in FIG. 2 is described in detail as an example.

[0078] In the embodiment of the present application, the connecting member 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, so that the bending strength of the connecting portion 2363 is greater than the bending strength of the bending portion 2364, so that the bending portion 2364 is easier to bend than the connecting portion 2363, so as to reduce the displacement of the bending axis 2365 of the bending portion 2364 during the bending process, so that the connecting member 236 can be smoothly installed in the shell 210 of the battery cell 20, thereby improving the structural stability of the connecting member 236 and improving the service life of the battery 10.

[0079] It should be understood that in the embodiment of the present application, the connection portion 2363 of the connection member 236 may include at least one layer of the first structure 51 stacked along the first direction Z. In some implementations, when the connection portion 2363 is a single-layer structure, that is, the connection portion 2363 includes a layer of the first structure 51, the first structure 51 can be prepared by an integrated molding process. In other implementations, when the connection portion 2363 includes multiple layers of the first structure 51, the multiple layers of the first structure 51 can be stacked along the first direction Z. In other implementations, when the connection portion 2363 includes multiple layers of the first structure 51, the multiple layers of the first structure 51 can also be fixed by welding or bonding.

[0080] It should also be understood that in the embodiment of the present application, the bending portion 2364 of the connecting member 236 may include at least one layer of the second structure 52 stacked along the first direction Z. In some implementations, when the bending portion 2364 is a single-layer structure, that is, the bending portion 2364 includes a layer of the second structure 52, the second structure 52 can be prepared by an integrated molding process. In other implementations, when the bending portion 2364 includes multiple layers of the second structure 52, the multiple layers of the second structure 52 can be stacked along the first direction Z. In other implementations, when the bending portion 2364 includes multiple layers of the second structure 52, without affecting the bending of the bending portion 2364, that is, when the bending strength of the connecting portion 2363 is guaranteed to be greater than the bending portion of the bending portion 2364, the multiple layers of the second structure 52 can be locally welded or bonded, so as to facilitate the fixed connection between the bending portion 2364 and the connecting portion 2363, and appropriately improve the bending strength of the bending portion 2364. Exemplarily, the multi-layer second structure 52 in the bending portion 2364 can be locally welded, that is, the portion of the second structure 52 at one end or both ends of the bending portion 2364 close to the connecting portion 2363 along the second direction X is welded, and the middle portion along the second direction X is not welded or is locally welded, so that the bending portion 2364 maintains a multi-layer structure in the middle portion along the second direction X, and the bending strength of the bending portion 2364 is less than the bending strength of the connecting portion 2363.

[0081] It should also be understood that in the embodiment of the present 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 bending portion 2364 can be set to be the same or different.

[0082] In some implementations, when the number of layers of the connecting portion 2363 and the bending portion 2364 in the embodiment of the present application is the same, illustratively, as Figure 7 As shown, Figure 7 A cross-sectional schematic diagram of a partial structure of a connecting member 236 provided in an embodiment of the present application is shown. The connecting member 236 is an integrated structure formed by stacking, that is, the first structure 51 of the connecting portion 2363 of the connecting member 236 and the second structure 52 of the corresponding bending portion 2364 are an integrally formed structure. Figure 7The dotted line in is the boundary line between the connecting portion 2363 and the bending portion 2364 of the connecting member 236. 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 bending portion 2364, and the distance between the first gap 53 and the second gap 54 along the first direction Z is equal. In other implementations, the two adjacent layers of the first structure 51 in the connecting member 236 can be further partially welded or partially bonded. For example, the multi-layer second structure 52 in the connecting portion 2363 of the connecting member 236 can be welded to further improve the bending strength of the connecting portion 2363. It should be understood that in the embodiment of the present application, Figure 7 The number of layers of the connection members 236 shown in FIG. 2 is merely an example.

[0083] It should be understood that the connection portion 2363 and the bending portion 2364 in the embodiment of the present application may be a split structure. In some implementations, the connection portion 2363 and the bending portion 2364 in the embodiment of the present application may be fixed by welding or bonding. Specifically, in the embodiment of the present application, according to actual needs, a connection portion 2363 including at least one layer of the first structure 51 and a bending portion 2364 including at least one layer of the second structure 52 may be prepared respectively, and then the bending portion 2364 and the connection portion 2363 are fixedly connected by welding or bonding. Exemplarily, the connection portion 2363 and the bending portion 2364 may be fixed by ultrasonic welding, laser welding or fusion welding, so that, in the embodiment of the present application, the connection portion 2363 and the bending portion 2364 are connected by welding or bonding, and the connection method is simple and reliable, which is conducive to reducing the processing and manufacturing cost of the battery 10.

[0084] Figure 8 FIG. 2 is a cross-sectional schematic diagram showing a partial structure of a connecting member 236 in an embodiment of the present application. Figure 8 As shown, the connection portion 2363 in the connection member 236 can be an integrally formed single-layer structure, that is, the connection portion 2363 includes a layer of first structure 51, and the bending portion 2364 of the connection member 236 is a six-layer second structure 52 stacked along the first direction Z. When preparing the connection member 236, the six-layer second structure 52 can be subjected to a melting welding process at one or both ends close to the connection portion 2363 along the second direction X, so that a melting structure is formed at one or both ends of the multi-layer second structure 52 along the second direction X, and the connection portion 2363 and the bending portion 2364 are subjected to a melting welding process to form a welding portion 55 at the connection between the connection portion 2363 and the bending portion 2364, thereby achieving a fixed connection between the connection portion 2363 and the bending portion 2364. It should be understood that in the embodiment of the present application, the Figure 8The number of layers of the second structure 52 shown in FIG. 5 is only an example.

[0085] In some implementations, such as Fig. 9 As shown, Fig. 9 A cross-sectional schematic diagram of a partial structure of another connecting member 236 in an embodiment of the present application is shown. The connecting portion 2363 in the connecting member 236 may include a three-layer first structure 51, and the bending portion 2364 may include a six-layer second structure 52. When preparing the connecting member 236, the three-layer first structure 51 at one or both ends of the connecting portion 2363 along the second direction X may be subjected to a melting welding treatment, so that a melting structure is formed at one or both ends of the connecting portion 2363 close to the bending portion 2364. Similarly, the six-layer second structure 52 at one or both ends of the bending portion 2364 along the second direction X may be subjected to a melting welding treatment, so that a melting structure is formed at one or both ends of the bending portion 2364 close to the connecting portion 2363. Subsequently, the connecting portion 2363 and the bending portion 2364 are subjected to a melting welding treatment to form a welding portion 55 at the connection between the connecting portion 2363 and the bending portion 2364, thereby achieving a fixed connection between the connecting portion 2363 and the bending portion 2364. It should be understood that in the embodiments of the present application, Fig. 9 The number of layers of the first structure 51 and the second structure 52 shown in FIG. 5 is only an example. It should also be understood that in the embodiment of the present application, Fig. 9 As shown, the first structure 51 in the connecting portion 2363 and the second structure 52 in the bending portion 2364 can be arranged in an aligned manner or in a staggered manner.

[0086] In some implementations, such as Fig.10 As shown, Fig.10 A cross-sectional schematic diagram of a partial structure of another connecting member 236 in an embodiment of the present application is shown. The connecting member 236 can be formed by stacking three third structures 2366, and a third gap 56 is provided between two adjacent third structures 2366. Specifically, when preparing the third structure 2366, two layers of second structures 52 along the second direction X and close to one or both ends of the connecting portion 2363 can be subjected to a melt welding process, so that one or both ends of the two layers of second structures 52 close to the connecting portion 2363 form a melt structure, and then the two layers of second structures 52 formed after melt welding and a layer of first structure 51 of the connecting portion 2363 are melt welded to form a welding portion 55 at the connection between the two layers of second structures 52 and the layer of first structure 51, thereby obtaining the third structure 2366. The connecting portion 2363 in the connecting member 236 thus obtained has three layers of first structures 51 and the bending portion 2364 has six layers of second structures 52. It should be understood that in the embodiment of the present application, Fig.10 The number of layers of the first structure 51 and the second structure 52 shown in FIG. 5 is only an example.

[0087] In some implementations, such as Fig.11 As shown, Fig.11 A cross-sectional schematic diagram of a partial structure of another connecting member 236 in an embodiment of the present application is shown. The connecting portion 2363 in the connecting member 236 can be an integrally formed single-layer structure, that is, the connecting portion 2363 includes a layer of first structure 51, and the bending portion 2364 of the connecting member 236 is a five-layer second structure 52 stacked along the first direction Z. When preparing the connecting member 236, the two adjacent second structures 52 of the bending portion 2364 can be bonded, that is, the second gap 54 between the adjacent second structures 52 is filled with an adhesive so that the multi-layer second structure 52 forms an integrated structure, and then the connecting portion 2363 and the bending portion 2364 are further bonded to form a bonding portion 57 at the connection between the connecting portion 2363 and the bending portion 2364, thereby achieving a fixed connection between the connecting portion 2363 and the bending portion 2364. It should be understood that in the embodiment of the present application, Fig.11 The number of layers of the second structure 52 shown in FIG. 5 is only an example.

[0088] In some implementations, such as Fig.12 As shown, Fig.12 A cross-sectional schematic diagram of a partial structure of another connecting member 236 in an embodiment of the present application is shown. The connecting portion 2363 in the connecting member 236 may include three layers of first structures 51, and the bending portion 2364 may include six layers of second structures 52. When preparing the connecting member 236, the two adjacent layers of the first structure 51 of the connecting portion 2363 may be bonded, that is, the first gap 53 between the adjacent first structures 51 is filled with an adhesive, so that the multi-layer first structure 51 forms an integrated structure. Similarly, the two adjacent layers of the second structure 52 of the bending portion 2364 may be bonded, that is, the second gap 54 between the adjacent second structures 52 is filled with an adhesive, so that the multi-layer second structure 52 forms an integrated structure, and then the connecting portion 2363 and the bending portion 2364 are bonded to form a bonding portion 57 at the connection between the connecting portion 2363 and the bending portion 2364, thereby achieving a fixed connection between the connecting portion 2363 and the bending portion 2364. It should be understood that in the embodiment of the present application, Fig.12 The number of layers of the second structure 52 shown in FIG. 5 is only an example. It should also be understood that in the embodiment of the present application, Fig.12 As shown, the first structure 51 in the connecting portion 2363 and the second structure 52 in the bending portion 2364 can be arranged in an aligned manner or in a staggered manner.

[0089] In some implementations, such as Fig.13 As shown, Fig.13A cross-sectional schematic diagram of a partial structure of another connecting member 236 in an embodiment of the present application is shown. The connecting member 236 can be formed by stacking three fourth structures 2367, and a third gap 56 is provided between adjacent fourth structures 2367. Specifically, when preparing the fourth structure 2367, the two layers of the second structure 52 of the bending portion 2364 can be bonded, that is, the second gap 54 between adjacent second structures 52 is filled with an adhesive so that the two layers of the second structure 52 form an integrated structure, and then the two layers of the second structure 52 and a layer of the first structure 51 of the connecting portion 2363 are bonded to form a bonding portion 57 at the connection between the second structure 52 and the layer of the first structure 51, thereby obtaining the fourth structure 2367. The connecting portion 2363 in the connecting member 236 thus obtained has three layers of the first structure 51 and the bending portion 2364 has six layers of the second structure 52. It should be understood that in the embodiment of the present application, Fig.13 The number of layers of the first structure 51 and the second structure 52 shown in FIG. 5 is only an example.

[0090] In some implementations, such as Fig.14 As shown, Fig.14 A cross-sectional schematic diagram showing a partial structure of another connecting member 236 in an embodiment of the present application is shown. Fig.14 When the connecting member 236 is shown, an integrated structure having a single-layer structure can be obtained first. Fig.14 The dotted line in is the boundary line between the connecting portion 2363 and the bending portion 2364 of the connecting member 236. The first structure 51 and the second structure 52 in the connecting member 236 are an integrated structure, and the connecting portion 2363 and the bending portion 2364 in the connecting member 236 are both single-layer structures. Subsequently, the single-layer second structure 52 is layered to obtain a bending portion 2364 having five layers of second structures 52, and there is a second gap 54 between two adjacent second structures 52. It should be understood that in the embodiment of the present application, Fig.14 The number of layers of the second structure 52 shown in FIG. 5 is only an example.

[0091] In some implementations, such as Fig.15 As shown, Fig.15 A cross-sectional schematic diagram showing a partial structure of another connecting member 236 in an embodiment of the present application is shown. Fig.15When the connecting member 236 shown in the figure is formed, the connecting member 236 having three layers of fifth structures 2368 can be first formed by stacking, and there is a third gap 56 between adjacent fifth structures 2368. The dotted line on each fifth structure 2368 is the boundary between the first structure 51 of the connecting portion 2363 and the second structure 52 of the bending portion 2364. Then, the second structure 52 in each fifth structure 2368 is layered to obtain a fifth structure 2368 having two layers of second structures 52, and there is a fourth gap 54 between two adjacent second structures 52, so that the connecting portion 2363 in the connecting member 236 has three layers of first structures 51 and the bending portion 2364 has six layers of second structures 52. It should be understood that in the embodiment of the present application, Fig.15 The number of layers of the first structure 51 and the second structure 52 shown in FIG. 5 is only an example.

[0092] It should be understood that in some implementations, the length of the bending portion 2364 in the embodiment of the present application along the first direction Z may range from [0.1mm, 5mm]. For example, the length of the bending portion 2364 in the embodiment of the present application along the first direction Z may be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 2mm, 3mm, 4mm, 5mm, or its value is within the range obtained by combining any two of the above values. In other implementations, the length of the bending portion 2364 in the embodiment of the present application along the first direction Z may also range from [0.5mm, 3mm].

[0093] It should be understood that in some implementations, the length of the connection portion 2363 in the embodiment of the present application along the first direction Z may range from [0.1mm, 5mm]. For example, the length of the connection portion 2363 in the embodiment of the present application along the first direction Z may be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 2mm, 3mm, 4mm, 5mm, or its value is within the range obtained by combining any two of the above values. In other implementations, the length of the connection portion 2363 in the embodiment of the present application along the first direction Z may also range from [0.5mm, 3mm].

[0094] In some implementations, the length of the connecting portion 2363 in the embodiment of the present application along the first direction Z may be greater than, equal to, or less than the length of the bending portion 2364 along the first direction Z. As an example, the embodiment of the present application is not limited to this.

[0095] It should be understood that in some implementations, the length of the bending portion 2364 in the embodiment of the present application along the second direction X may range from [1mm, 10mm]. For example, the length of the bending portion 2364 in the embodiment of the present application along the second direction X may be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, or its value is within the range obtained by combining any two of the above values. In other implementations, the length of the bending portion 2364 in the embodiment of the present application along the second direction X may also range from [3mm, 7mm].

[0096] It should be understood that in some implementations, the length of the connection portion 2363 in the embodiment of the present application along the second direction X may range from [2mm, 50mm]. For example, the length of the connection portion 2363 in the embodiment of the present application along the second direction X may be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 20mm, 30mm, 40mm, 50mm, or the value thereof is within the range obtained by combining any two of the above values. In other implementations, the length of the connection portion 2363 in the embodiment of the present application along the second direction X may also range from [5mm, 20mm].

[0097] It should also be understood that, in some implementations, the length of the connection portion 2363 and / or the bending portion 2364 in the embodiment of the present application along the third direction Y may range from [1mm, 50mm]. Exemplarily, the length of the connection portion 2363 and / or the bending portion 2364 in the embodiment of the present application along the third direction Y may be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 20mm, 30mm, 40mm, 50mm, or the value thereof is within the range obtained by combining any two of the above values. In other implementations, the length of the connection portion 2363 and / or the bending portion 2364 in the embodiment of the present application along the third direction Y may also range from [5mm, 20mm].

[0098] 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, as an example, and this embodiment of the present application is not limited to this.

[0099] It should also be understood that in some implementations, the number of layers of the first structure 51 and / or the second structure 52 in the embodiment of the present application may range from [1, 100]. For example, the number of layers of the first structure 51 and / or the second structure 52 in the embodiment of the present 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 thereof is within the range obtained by combining any two of the above values. In other implementations, the number of layers of the first structure 51 and / or the second structure 52 in the embodiment of the present application may also range from [5, 50].

[0100] In some implementations, such as Figure 5 or Figure 6 As shown, the connection portion 2363 includes at least one first structure 51 stacked along the first direction Z, and the first structure 51 includes the reinforcement structure 60. Therefore, in the embodiment of the present application, the connection portion 2363 includes a plurality of first structures 51 stacked along the first direction Z. By arranging the reinforcement structure 60 on the plurality of first structures 51, the bending strength of the connection portion 2363 can be improved to reduce the offset of the bending axis 2365 of the bending portion 2364 during the bending process, so that the connection member 236 can be smoothly installed in the housing 210 of the battery cell 20, thereby improving the structural stability of the connection member 236 and further improving the service life of the battery 10.

[0101] Fig.16 A schematic structural diagram of another connecting member 236 provided in an embodiment of the present application is shown.

[0102] In some implementations, such as Fig.16 As shown, a surface of the first structure 51 perpendicular to the first direction Z is provided with a protruding structure 61 , and the reinforcing structure 60 includes the protruding structure 61 .

[0103] It should be understood that in the embodiment of the present application, the protruding structure 61 can be obtained by embossing the multi-layer first structure 51. The embossed shape of the protruding structure 61 formed after embossing perpendicular to the first direction Z can be set to a circle, a square, a diamond, a polygon, etc. Specifically, the embossing shape can be set according to actual needs, as an example, the embodiment of the present application does not limit this. It should also be understood that the number of the protruding structure 61 can be set to one or more, as an example, the embodiment of the present application does not limit this.

[0104] In some implementations, the length of the protruding structure 61 along the first direction Z may range from [0.01 mm, 1 mm]. For example, the length of the protruding structure 61 along the first direction Z in the embodiment of the present application may be set to 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 its value is within the range obtained by combining any two of the above values. In other implementations, the length of the protruding structure 61 along the first direction Z may also range from [0.05 mm, 0.5 mm].

[0105] In some implementations, the length of the protruding structure 61 along the second direction X may range from [1 mm to 70 mm]. For example, the length of the protruding structure 61 along the second direction X in the embodiment of the present application may be set to 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 thereof is within the range obtained by combining any two of the above values. In other implementations, the length of the protruding structure 61 along the second direction X may also range from [5 mm to 50 mm].

[0106] In some implementations, the length of the protruding structure 61 along the third direction Y may range from [1 mm, 50 mm]. For example, the length of the protruding structure 61 along the third direction Y in the embodiment of the present application may be set to 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 its value is within the range obtained by combining any two of the above values. In other implementations, the length of the protruding structure 61 along the third direction Y may also range from [5 mm, 20 mm].

[0107] Thus, in the embodiment of the present application, a protruding structure 61 is provided on the surface of the first structure 51 perpendicular to the first direction Z. For example, the protruding structure 61 can be formed after local pressing, and the distance between adjacent first structures 51 in the first direction Z is reduced, so that the multi-layer first structures 51 are in close contact with each other, thereby improving the bending strength of the connecting portion 2363. Secondly, the protruding structure 61 formed after the local pressing process protrudes from the surface of the first structure 51 perpendicular to the first direction Z, so that the connecting portion 2363 is difficult to bend at the protruding structure 61, so as to reduce the displacement of the bending axis 2365 of the bending portion 2364 during the bending process, so that the connecting member 236 can be smoothly installed in the shell 210 of the battery cell 20, thereby improving the structural stability of the connecting member 236, and further improving the service life of the battery 10.

[0108] It should also be understood that in the embodiment of the present application, the number of layers of the first structure 51 provided with the protruding structure 61 may range from [2, 100]. For example, the number of layers of the first structure 51 provided with the protruding structure 61 in the embodiment of the present application may be 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, or the value thereof is within the range obtained by combining any two of the above values. In some implementations, the number of layers of the first structure 51 provided with the protruding structure 61 may also range from [5, 50].

[0109] In some implementations, the connection portion 2363 includes multiple layers of the first structure 51, and the protruding structures 61 of the multiple layers of the first structure 51 protrude in the same direction. It should be understood that in the embodiment of the present application, the protruding structures 61 of the multiple layers of the first structure 51 protrude in the same direction may refer to protruding along one end of the first direction Z. Therefore, in the embodiment of the present application, by making the protruding structures 61 of the multiple layers of the first structure 51 protrude in the same direction, for example, the multiple layers of the first structure 51 can be pressed in the same direction through a pressing process, so as to further improve the bending strength of the connection portion 2363, reduce the offset of the bending axis 2365 of the bending portion 2364 during the bending process, so that the connection member 236 can be smoothly installed in the shell 210 of the battery cell 20, improve the structural stability of the connection member 236, and thereby improve the service life of the battery 10.

[0110] In some implementations, the positions of the protruding structures 61 of the multiple layers of the first structure 51 overlap each other. Therefore, in the embodiment of the present application, by overlapping the positions of the protruding structures 61 of the multiple layers of the first structure 51, for example, the same area of ​​the multiple layers of the first structure 51 arranged continuously can be pressed in the same direction through a pressing process, so that the distance between the multiple layers of the first structure 51 along the first direction Z is reduced, and the bending strength of the multiple layers of the first structure 51 can be improved by improving the bending strength of at least a part of the area of ​​the connecting portion 2363, so as to reduce the offset of the bending axis 2365 of the bending portion 2364 during the bending process, so that the connecting member 236 can be smoothly installed in the shell 210 of the battery cell 20, and the structural stability of the connecting member 236 is improved, thereby improving the service life of the battery 10.

[0111] In some implementations, at least two adjacent layers of the first structure 51 in the multi-layer structure 51 are interconnected, and the reinforcing structure 60 includes at least two layers of the first structure 51 that are interconnected. It should be understood that the connection method of the at least two adjacent layers of the first structure 51 in the multi-layer structure 51 in the embodiment of the present application includes but is not limited to ultrasonic welding, laser welding or bonding. Specifically, when the connection method of the two adjacent layers of the first structure 51 in the multi-layer structure 51 is welding connection or bonding, the connection area in the embodiment of the present application refers to the welding area or bonding area between the two adjacent layers of the first structure 51 in the at least two layers of the first structure 51. It should be understood that the connection area refers to at least a portion of the surface of one side or both sides of the first structure 51 perpendicular to the first direction Z.

[0112] It should be understood that in the embodiment of the present application, the length of the connection area along the second direction X may range from [1mm, 70mm]. For example, the length of the connection area along the second direction X in the embodiment of the present application may be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, or its value is within the range obtained by combining any two of the above values. In some implementations, the length of the connection area along the second direction X may also range from [5mm, 50mm].

[0113] It should also be understood that in the embodiment of the present application, the length of the above-mentioned connection area along the third direction Y may range from [1mm, 50mm]. For example, the length of the connection area along the third direction Y in the embodiment of the present application may be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 20mm, 30mm, 40mm, 50mm, or its value is within the range obtained by combining any two of the above values. In some implementations, the length of the connection area along the third direction Y may also range from [5mm, 20mm].

[0114] Therefore, in the embodiment of the present application, by connecting at least two adjacent layers of the multi-layer first structure 51 to each other, the multi-layer first structure 51 is tightly connected, thereby improving the bending strength of the connecting portion 2363 and reducing the offset of the bending axis 2365 of the bending portion 2364 during the bending process.

[0115] In some implementations, in the embodiment of the present application, when the bending portion 2364 includes multiple layers of the second structure 52, at least two adjacent layers of the multiple layers of the second structure 51 of the bending portion 2364 may also be connected to each other. When the bending strength of the connecting portion 2363 is greater than the bending strength of the bending portion 2364, the bending strength of the bending portion 2364 can be appropriately improved, which is beneficial to reduce excessive deformation of the bending portion 2364 during the bending process and improve the fatigue strength of the bending portion 2364.

[0116] Fig.17 A schematic structural diagram of another connecting member 236 provided in an embodiment of the present application is shown.

[0117] In some implementations, the connection portion 2363 includes at least one first structure 51 stacked along a first direction Z, and the reinforcing structure 60 is disposed on at least one side of the first structure 51 perpendicular to the first direction Z. Exemplarily, the reinforcing structure may include a first reinforcing structure 62, and the first reinforcing structure 62 may be disposed on one side or both sides of the at least one first structure 51 perpendicular to the first direction Z. Exemplarily, as Fig.17 As shown, the first reinforcement structures 62 may be respectively disposed at two ends of the connection portion 2363 close to the bending portion 2364 along the second direction X. Specifically, the number of the first reinforcement structures 62 may be set according to actual needs.

[0118] It should be understood that in the embodiment of the present application, the length of the first reinforcing structure 62 along the first direction Z may range from [0.01mm, 5mm]. For example, the length of the first reinforcing structure 62 along the first direction Z in the embodiment of the present application may be 0.01mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 2mm, 3mm, 4mm, 5mm, or its value is within the range obtained by combining any two of the above values. In some implementations, the length of the first reinforcing structure 62 along the first direction Z may also range from [0.05mm, 3mm].

[0119] It should also be understood that in the embodiment of the present application, the length of the first reinforcing structure 62 along the second direction X may range from [1mm, 70mm]. For example, the length of the first reinforcing structure 62 along the second direction X in the embodiment of the present application may be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, or its value is within the range obtained by combining any two of the above values. In some implementations, the length of the first reinforcing structure 62 along the second direction X may also range from [5mm, 50mm].

[0120] It should also be understood that in the embodiment of the present application, the length of the first reinforcing structure 62 along the third direction Y may range from [1mm, 60mm]. For example, the length of the first reinforcing structure 62 along the third direction Y in the embodiment of the present application may be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, or the value thereof is within the range obtained by combining any two of the above values. In some implementations, the length of the first reinforcing structure 62 along the third direction Y may also range from [5mm, 30mm].

[0121] Therefore, by providing 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, thereby improving the bending strength of the connecting portion 2363 and reducing the offset of the bending axis 2365 of the bending portion 2364 during the bending process.

[0122] In some implementations, the reinforcing structure 60 is respectively provided on both sides of the first structure 51 perpendicular to the first direction Z, so that the bending strength of the first structure 51 can be further improved, thereby improving the bending strength of the connecting portion 2363 and reducing the offset of the bending axis 2365 of the bending portion 2364 during the bending process.

[0123] Fig.18 A schematic structural diagram of another connecting member 236 provided in an embodiment of the present application is shown.

[0124] In some implementations, the same reinforcement structure 60 is disposed on both sides of the first structure 51 perpendicular to the first direction Z, and the same reinforcement structure 60 covers the first structure 51. For example, Fig.18 As shown, the reinforcement structure 60 for covering the first structure 51 may be a second reinforcement structure 63 .

[0125] In some implementations, the second reinforcement structure 63 may be a thin film structure.

[0126] It should be understood that in the embodiment of the present application, the thickness of the thin film structure may range from [0.01mm, 5mm]. For example, the thickness of the thin film structure in the embodiment of the present application may be 0.01mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 2mm, 3mm, 4mm, 5mm, or its value is within the range obtained by combining any two of the above values. In some implementations, the thickness of the thin film structure may also range from [0.05mm, 2mm].

[0127] It should also be understood that the length of the thin film structure in the embodiment of the present application along the second direction X may range from [1mm, 100mm]. For example, the length of the thin film structure in the embodiment of the present application along the second direction X may be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, or its value is within the range obtained by combining any two of the above values. In some implementations, the length of the thin film structure in the embodiment of the present application along the second direction X may also range from [5mm, 50mm].

[0128] It should also be understood that the length of the thin film structure in the embodiment of the present application along the third direction Y may range from [1mm, 70mm]. For example, the length of the thin film structure in the embodiment of the present application along the third direction Y may be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, or its value is within the range obtained by combining any two of the above values. In some implementations, the length of the thin film structure in the embodiment of the present application along the third direction Y may also range from [5mm, 30mm].

[0129] In some implementations, the second reinforcement structure 63 may be a heat shrink tube. Specifically, the heat shrink tube may cover at least one first structure 51 of the connecting portion 2363, and then the heat shrink tube is heated to shrink, thereby effectively improving the bending strength of the at least one first structure 51, and then improving the bending strength of the connecting portion 2363.

[0130] It should be understood that in the embodiment of the present application, the value range of the tube thickness of the heat shrink tube may be [0.01mm, 5mm]. For example, the tube thickness of the heat shrink tube in the embodiment of the present application may be 0.01mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 2mm, 3mm, 4mm, 5mm, or its value is within the range obtained by combining any two of the above values. In some implementations, the value range of the tube thickness of the heat shrink tube may also be [0.05mm, 2mm].

[0131] It should also be understood that in the embodiment of the present application, the length of the heat shrink tube along the second direction X may range from [1mm, 150mm]. For example, the length of the heat shrink tube along the second direction X in the embodiment of the present application may be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, or its value is within the range obtained by combining any two of the above values. In some implementations, the length of the heat shrink tube along the second direction X may also range from [5mm, 100mm].

[0132] It should also be understood that in the embodiment of the present application, the length of the heat shrink tube along the third direction Y may range from [1mm, 100mm]. For example, the length of the heat shrink tube along the third direction Y in the embodiment of the present application may be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, or its value is within the range obtained by combining any two of the above values. In some implementations, the length of the heat shrink tube along the third direction Y may also range from [5mm, 50mm].

[0133] Therefore, in the embodiment of the present application, the same reinforcement structure 60 can be provided on both sides of the first structure 51 perpendicular to the first direction Z, and the same reinforcement structure 60 covers the first structure 51, which can significantly improve the bending strength of the connecting portion 2363 and reduce the offset of the bending axis 2365 of the bending portion 2364 during the bending process.

[0134] In some other embodiments, in the embodiments of the present application, the first structure 51 is provided with reinforcing structures 60 on both sides perpendicular to the first direction Z, and the first structure 51 is provided with reinforcing structures 60 on both sides perpendicular to the third direction Y. In this way, the bending strength of the connecting portion 2363 can be significantly improved, and the offset of the bending axis 2365 of the bending portion 2364 during the bending process can be reduced, so that the connecting member 236 can be smoothly installed into the shell 210 of the battery cell 20, thereby improving the structural stability of the connecting member 236 and thus improving the service life of the battery 10.

[0135] In some implementations, in the embodiment of the present application, the material of the reinforcing structure 60 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.

[0136] In some embodiments, the connecting portion 2363 includes at least one layer of the first structure 51 stacked along the first direction Z, the bending portion 2364 includes at least one layer of the second structure 52 stacked along the first direction Z, and 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 bending portion 2364, thereby facilitating the processing and manufacturing of the connecting member 236 and improving the processing efficiency of the battery 10.

[0137] In the embodiment of the present application, the bending strength of the connecting portion 2363 and the bending portion 2364 in the embodiment of the present application can be tested by a three-point or four-point bending test, which is described below by taking a three-point bending test as an example. Specifically, during the test, the test sample is first prepared, that is, the sample to be tested is processed into 5 test samples with a size of 2mm×3mm×15mm, and a three-point bending test is performed on the test sample using a universal material testing machine, wherein the span is 30mm, the loading rate is 0.5mm / min, and the measurement values ​​at 3 positions on each sample are measured, and the average value of the 3 measurement values ​​is calculated, and the average value calculated for the 5 test samples is further averaged to obtain the bending strength of the test sample.

[0138] It should be understood that the bending strength of the connection portion 2363 in the embodiment of the present application can be set according to actual needs. In some implementations, the bending strength of the connection portion 2363 in the embodiment of the present application may be 0.04MPa to 1MPa. If the bending strength of the connection portion 2363 is less than 0.04MPa, that is, the bending strength of the connection portion 2363 is small, the connection portion 2363 will be bent during the bending process of the connecting member 236, thereby causing the position of the bending axis 2365 of the bending portion 2364 to shift, making it difficult for the connecting member 236 to be smoothly loaded into the housing 210 of the battery cell 20. If the bending strength of the connection portion 2363 is greater than 1MPa, that is, the bending strength of the connection portion 2363 is large, it is easy to make the material processing cost high. Therefore, the bending strength of the connection portion 2363 in the embodiment of the present application is 0.04MPa to 1MPa.

[0139] For example, the bending strength of the connection portion 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, 1 MPa, or a value within the range obtained by combining any two of the above values.

[0140] It should also be understood that the bending strength of the bending portion 2364 in the embodiment of the present application can be set according to actual needs. In some implementations, the bending strength of the bending portion 2364 in the embodiment of the present application may be 0.02MPa to 0.45MPa. If the bending strength of the bending portion 2364 is less than 0.02MPa, that is, the bending strength of the bending portion 2364 is too small, the position of the bending axis 2365 of the bending portion 2364 will be offset during the bending process of the connecting member 236, making it difficult for the connecting member 236 to be smoothly loaded into the housing 210 of the battery cell 20. If the bending strength of the bending portion 2364 is greater than 0.45MPa, that is, the bending strength of the bending portion 2364 is large, the bending portion 2364 is difficult to bend, affecting the use of the connecting member 236. Therefore, the bending strength of the bending portion 2364 in the embodiment of the present application is 0.02MPa to 0.45MPa.

[0141] For example, the bending strength of the bending portion 2364 may be 0.02MPa, 0.03MPa, 0.04MPa, 0.05MPa, 0.06MPa, 0.07MPa, 0.08MPa, 0.09MPa, 0.1MPa, 0.15MPa, 0.2MPa, 0.25MPa, 0.3MPa, 0.35MPa, 0.4MPa, 0.45MPa, or any value within the range obtained by combining any two of the above values.

[0142] In some implementations, such as Figures 5 to 11 As shown, the connection member 236 further includes an electrode terminal connection end 2361 and a tab connection end 2362 , and the tab connection end 2362 and the connection portion 2363 are connected as well as the electrode terminal connection end 2361 and the connection portion 2363 are connected respectively via the bending portion 2364 .

[0143] In some implementations, the tab connection end 2362 and the electrode terminal connection end 2361 are disposed at two ends of the connection portion 2363 along the second direction X. Thus, in the embodiment of the present application, by disposing the tab connection end 2362 and the electrode terminal connection end 2361 at two ends of the connection portion 2363 along the second direction X, a certain distance exists between the tab connection end 2362 and the electrode terminal connection end 2361, so as to reduce the mutual influence between the electrode terminal 237 and the electrode assembly 220.

[0144] 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. Exemplarily, when the bending direction of the bent portion 2364 between the tab connection end 2362 and the connection portion 2363 is set to be clockwise, the bending direction of the bent portion 2364 between the electrode terminal connection end 2361 and the connection portion 2363 is set to be counterclockwise. When the bending direction of the bent portion 2364 between the tab connection end 2362 and the connection portion 2363 is set to be counterclockwise, the bending direction of the bent portion 2364 between the electrode terminal connection end 2361 and the connection portion 2363 is set to be clockwise.

[0145] Therefore, in the embodiment of the present application, by setting the bending direction of the bending portion 2364 between the pole ear connection end 2362 and the connection portion 2363 to be opposite to the bending direction of the bending portion 2364 between the electrode terminal connection end 2361 and the connection portion 2363, the bent connecting member 236 occupies less space inside the battery, thereby saving space inside the battery 10.

[0146] In some implementations, when the connection member 236 is a negative electrode connection member, the material of the connection member 236 may be copper. When the connection member 236 is a positive electrode connection member, the material of the connection member 236 may be aluminum.

[0147] In some implementations, see Fig.16 , the embodiment of the present application provides a connecting member 236, in which the first structure 51 of the connecting portion 2363 and the second structure 52 of the bending portion 2364 in the connecting member 236 are both 4 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 0.15mm, the length of the first structure 51 and the second structure 52 along the third direction Y is 8mm, and the length of the connecting member 236 along the second direction X is 18mm. Among them, the outer surface of the first structure 51 at both ends of the connecting portion 2363 along the first direction Z is embossed, and the outer surface of the first structure 51 can be understood as the surface of the first structure 51 away from the center of the connecting portion 2363. The length of the embossed area along the second direction X is 6mm, and the length of the embossed area along the third direction Y is 8mm. Exemplarily, the connecting member 236 can be applied to a battery cell 20 with a diameter of 32mm and a length of 150mm.

[0148] In some implementations, see Fig.17, the embodiment of the present application provides another connecting member 236, in which the first structure 51 of the connecting portion 2363 and the second structure 52 of the bending portion 2364 in the connecting member 236 are both 6 layers, and the length of each layer of the first structure 51 and each layer of the second structure 52 along the first direction Z is 0.1mm, and the length of the connecting member 236 along the third direction Y is 18mm. Along the bending direction of the bending portion 2364, from the second structure 52 close to the bending axis 2365 of the bending portion 2364 to the second structure 52 away from the bending axis 2365, the length of the second structure 52 along the second direction X is 26mm, 28mm, 29mm, 30mm, 31mm, and 32mm respectively. Among them, the first structure 51 of the connecting portion 2363 can be welded, and the length of the welding area along the second direction X is 10mm, and the length of the welding area along the third direction Y is 18mm. Exemplarily, the connection member 236 may be applied to a battery cell 20 having a diameter of 46 mm and a length of 180 mm.

[0149] In some implementations, see Fig.17 , the embodiment of the present application provides another connecting member 236, in which the first structure 51 of the connecting portion 2363 and the second structure 52 of the bending portion 2364 in the connecting member 236 are both 5 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 0.1mm, the length of the first structure 51 and the second structure 52 along the third direction Y are both 10mm, and the length of the connecting member 236 along the second direction X is 20mm. Among them, a patch structure is respectively arranged on the outer surface of the first structure 51 at both ends of the connecting portion 2363 along the first direction Z, and the outer surface of the first structure 51 can 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 8mm, and the length of the patch structure along the third direction Y is 12mm. Along the third direction Y, the patch structure beyond the connecting member 236 can be melt-processed to make it attached to the connecting member 236. Exemplarily, the connection member 236 may be applied to a battery cell 20 having a diameter of 34 mm and a length of 200 mm.

[0150] In some implementations, see Fig.18, the embodiment of the present application provides another connecting member 236, in which the first structure 51 of the connecting portion 2363 and the second structure 52 of the bending portion 2364 in the connecting member 236 are both 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 0.15mm, the length of the first structure 51 and the second structure 52 along the third direction Y is 30mm, and the length of the connecting member 236 along the second direction X is 46mm. Among them, a patch structure is respectively arranged on the outer surface of the first structure 51 at both ends of the connecting portion 2363 along the first direction Z, and the outer surface of the first structure 51 can 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 36mm, and the length of the patch structure along the third direction Y is 28mm. Subsequently, the connection portion 2363 and the bent portion 2364 of the connection member 236 are wrapped with an annular film, and the thickness of the wrapping film formed after wrapping is 0.06 mm, the length of the wrapping film along the second direction X is 60 mm, and the length of the wrapping film along the third direction Y is 32 mm. Exemplarily, the connection member 236 can be applied to a battery cell 20 with a diameter of 50 mm and a length of 190 mm.

[0151] In some implementations, see Fig.18 , the embodiment of the present application provides another connecting member 236, in which the first structure 51 of the connecting portion 2363 and the second structure 52 of the bending portion 2364 in the connecting member 236 are both 7 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 0.1mm, the length of the first structure 51 and the second structure 52 along the third direction Y is 8mm, and the length of the connecting member 236 along the second direction X is 24mm. Among them, a heat shrink tube is nested in the connecting portion 2363 of the connecting member 236, the length of the heat shrink tube along the second direction X is 15mm, and the length of the heat shrink tube along the third direction Y is 12mm. Specifically, after the heat shrink tube is nested in the connecting portion 2363, it is heated to shrink it to strengthen the bending strength of the connecting portion 2363. Exemplarily, the connecting member 236 can be applied to a battery cell 20 with a diameter of 34mm and a length of 184mm.

[0152] It should be noted that, under the premise of no conflict, the various embodiments described in this application and / or the technical features in each embodiment can be arbitrarily combined with each other, and the technical solution obtained after the combination should also fall within the protection scope of this application.

[0153] Although the present application has been described with reference to the above embodiments, various modifications may be made thereto and components thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A connecting member for a battery cell, the connecting member include: Connecting part; a bending portion, the connecting portion being connected to the bending portion; Wherein, the connecting portion has a reinforcement structure, and the reinforcement structure is used to make the bending strength of the connecting portion greater than the bending strength of the bending portion.

2. The connecting member according to claim 1, in, The connecting portion includes at least one first structure layered along a first direction, and the first structure includes the reinforcing structure.

3. The connecting member according to claim 2, in, A surface of the first structure perpendicular to the first direction is provided with a protruding structure, and the reinforcing structure includes the protruding structure.

4. The connecting member according to claim 3, in, The connecting portion 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 member according to claim 4, in, The positions of the protruding structures of the multiple layers of the first structure overlap with each other.

6. The connecting member according to any one of claims 2 to 5, in, At least two adjacent layers of the first structures in the multiple layers are connected to each other, and the reinforcement structure includes at least two layers of the first structures connected to each other.

7. The connecting member according to any one of claims 1 to 6, in, The connecting portion includes at least one layer of first structures stacked along a first direction, and the reinforcing structure is disposed on at least one side of the first structure perpendicular to the first direction.

8. The connecting member according to claim 7, in, The reinforcement structures are respectively arranged on two sides of the first structure that are perpendicular to the first direction.

9. The connecting member according to claim 8, in, The same reinforcement structure is disposed on two sides of the first structure that are perpendicular to the first direction, and the same reinforcement structure covers the first structure.

10. The connecting member according to any one of claims 7 to 9, in, The material of the reinforcement 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.

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

12. The connecting member according to any one of claims 1 to 11, in, The connecting member further includes a tab connection end and an electrode terminal connection end, and the tab connection end and the connection portion are connected via the bending portion, respectively.

13. The connecting member according to claim 12, in, The tab connection end and the electrode terminal connection end are arranged at two ends of the connection portion along the second direction.

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

15. A battery cell, in, Comprising a connecting member according to any one of claims 1 to 14.

16. A battery, in, Comprising the battery cell according to claim 15 .

17. An electrical device, in, Comprising a battery according to claim 16.

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