Battery monomer, battery and electric device

Abstract

The utility model is applicable to the technical field of batteries, and provides a battery monomer, a battery and a power utilization device, the power utilization device comprises the battery, the battery comprises the battery monomer, and the battery monomer comprises an electrode assembly, a shell and an electrode terminal; the electrode assembly is arranged in the shell; the shell comprises a first wall, and the first wall is provided with a lead-out hole and a first limiting part; the electrode terminal comprises a main body structure connected to the electrode assembly and a second limiting part arranged on the main body structure; the main body structure is connected to the first wall and covers the lead-out hole; and the first limiting part and the second limiting part are matched in a concave-convex manner, so that the electrode terminal and the first wall are limited in the circumferential direction of the lead-out hole. Through the concave-convex matching of the first limiting part on the first wall of the shell and the second limiting part on the electrode terminal, the limiting of the electrode terminal on the first wall can be improved, so that the bonding strength between the electrode terminal and the first wall can be improved, and the risk that the electrode terminal is separated from the first wall is reduced; therefore, the connection effect between the electrode terminal and the electrode assembly can be improved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and more specifically, relates to a battery cell, a battery, and an electrical device. Background Art

[0002] In the related art, a battery cell includes an electrode assembly, a housing, and electrode terminals. The electrode assembly is disposed within the housing. The electrode terminals are disposed on the housing and connected to the electrode assembly.

[0003] Among them, the bonding strength between the electrode terminal and the shell is low, and there is a risk that the electrode terminal will fall out of the shell, resulting in failure of the connection relationship between the electrode assembly and the electrode terminal. Utility Model Content

[0004] In view of the above problems, embodiments of the present application provide a battery cell, a battery, and an electrical device, which can improve the technical problem of low bonding strength between electrode terminals and the housing.

[0005] In a first aspect, an embodiment of the present application provides a battery cell, comprising:

[0006] electrode assembly;

[0007] The electrode assembly is disposed in the outer shell; the outer shell includes a first wall, the first wall is provided with an outlet hole and a first limiting portion;

[0008] The electrode terminal includes a main structure connected to the electrode assembly and a second limiting portion provided on the main structure; the main structure is connected to the first wall and covers the lead-out hole; the first limiting portion and the second limiting portion are matched in a concave-convex manner so that the electrode terminal and the first wall form a limit in the circumferential direction of the lead-out hole.

[0009] In the battery cell provided in the embodiments of the present application, a first limiting portion on the first wall of the housing and a second limiting portion on the electrode terminal cooperate in a concave-convex manner to limit the electrode terminal and the first wall in the circumferential direction of the lead-out hole, thereby restricting the rotation of the electrode terminal on the first wall and improving the position of the electrode terminal on the first wall. This can improve the bonding strength between the electrode terminal and the first wall, thereby reducing the risk of the electrode terminal breaking free from the connection between the electrode terminal and the first wall and becoming detached from the first wall, thereby improving the connection between the electrode terminal and the electrode assembly.

[0010] In some embodiments, one of the first limiting portion and the second limiting portion includes a limiting groove, and the other includes a protrusion; in the circumferential direction of the lead-out hole, the protrusion is limited in the limiting groove.

[0011] By positioning the convex portion within the limiting groove at the circumferential upper limit of the lead-out hole, a concave-convex fit between the first and second limiting portions can be achieved, thereby achieving the effect of positioning the electrode terminal at the circumferential upper limit of the lead-out hole on the first wall, thereby improving the bonding strength between the electrode terminal and the first wall. Furthermore, there are numerous options for the concave-convex fit between the first and second limiting portions, providing great flexibility.

[0012] In some embodiments, a mounting groove is provided on one side of the first wall in the axial direction of the outlet hole; the mounting groove is arranged around the outer periphery of the outlet hole, and the first limiting portion is provided on the inner wall of the mounting groove; in the radial direction of the outlet hole, the main structure is limited within the mounting groove.

[0013] This allows the electrode terminal to be pre-positioned on the first wall, ensuring that it is stably secured there. This facilitates a stable connection between the main structure and the first wall, facilitating installation of the electrode terminal on the first wall. Furthermore, the connection quality between the electrode terminal and the first wall is improved, thereby enhancing the bonding strength between the electrode terminal and the first wall, reducing the risk of the electrode terminal detaching from the first wall and the risk of connection failure between the electrode terminal and the motor assembly.

[0014] In some embodiments, in the axial direction of the lead-out hole, the mounting groove is provided on a side of the first wall away from the electrode assembly.

[0015] This arrangement, on the one hand, allows the main structure to be confined within the mounting groove so that the electrode terminals are mounted on the first wall, while the main structure can be exposed to the outside of the battery cell through the mounting groove, thereby facilitating connection between the main structure and external conductive components. On the other hand, it also facilitates mounting the electrode terminals on the first wall.

[0016] In some embodiments, the first limiting portion includes a limiting groove; in the radial direction of the lead-out hole, the limiting groove of the first limiting portion is arranged on the inner side wall of the mounting groove; in the axial direction of the lead-out hole, the limiting groove of the first limiting portion passes through the side of the first wall having the mounting groove.

[0017] In this way, it is convenient to perform welding at the mating position between the protrusion and the limiting groove to realize the connection between the first limiting portion and the second limiting portion, thereby improving the bonding strength between the electrode terminal and the first wall, reducing the risk of the electrode terminal detaching from the first wall, and reducing the risk of connection failure between the electrode terminal and the motor assembly.

[0018] In some embodiments, the second limiting portion includes a limiting groove provided on the main structure; in the axial direction of the lead-out hole, the limiting groove of the second limiting portion passes through the portion of the main structure having the limiting groove.

[0019] In this way, it is convenient to perform welding at the mating position between the protrusion and the limiting groove to realize the connection between the first limiting portion and the second limiting portion, thereby improving the bonding strength between the electrode terminal and the first wall, reducing the risk of the electrode terminal detaching from the first wall, and reducing the risk of connection failure between the electrode terminal and the motor assembly.

[0020] In some embodiments, in the radial direction of the lead-out hole, the size of the protrusion ranges from 1 mm to 10 mm;

[0021] And / or, in the circumferential direction of the lead-out hole, the size of the protrusion ranges from 1 mm to 10 mm.

[0022] By adopting the above technical solution, the protrusion has a relatively suitable size. On the one hand, when the protrusion and the retaining groove are matched, the protrusion can be reliably and stably restrained within the retaining groove along the circumference of the lead-out hole, thereby allowing the electrode terminal to be reliably and stably restrained on the first wall along the circumference of the lead-out hole. This improves the bonding strength between the electrode terminal and the first wall, reduces the risk of the electrode terminal detaching from the first wall, and reduces the risk of connection failure between the electrode terminal and the motor assembly. On the other hand, the weight and volume of the electrode terminal and the first wall can be avoided from being excessively increased, thereby helping to ensure the energy density of the battery cell to a certain extent.

[0023] In some embodiments, in the radial direction of the lead-out hole, the size of the protrusion ranges from 3 mm to 5 mm;

[0024] And / or, in the circumferential direction of the lead-out hole, the size of the protrusion ranges from 3 mm to 5 mm.

[0025] By adopting this technical solution, the protrusion has a relatively suitable size. On the one hand, it allows the protrusion to be reliably and stably restrained within the retaining groove along the circumference of the lead-out hole, thereby reliably and stably restraining the electrode terminal on the first wall along the circumference of the lead-out hole. This improves the bonding strength between the electrode terminal and the first wall, reduces the risk of the electrode terminal detaching from the first wall, and reduces the risk of connection failure between the electrode terminal and the motor assembly. On the other hand, it helps to ensure the energy density of the battery cell to a certain extent.

[0026] In some embodiments, in the radial direction of the lead-out hole, the size of the limit groove is larger than the size of the protrusion, and the difference in size between the limit groove and the protrusion is 0.02 to 0.1 mm; and / or, in the circumferential direction of the lead-out hole, the size of the limit groove is larger than the size of the protrusion, and the difference in size between the limit groove and the protrusion is 0.02 to 0.1 mm.

[0027] By adopting the above technical solution, a relatively suitable size difference is achieved between the limiting groove and the protrusion. On the one hand, this facilitates the concave-convex fit between the protrusion and the limiting groove, and on the other hand, it enables the protrusion to be stably and reliably restrained in the limiting groove, thereby facilitating the pre-positioning and connection between the electrode terminal and the first wall.

[0028] In some embodiments, in the axial direction of the lead-out hole, an avoidance groove is provided on the side of the first wall having the mounting groove, and the inner wall of the avoidance groove is located between the side of the first wall having the mounting groove and the inner wall of the mounting groove; the avoidance groove is arranged around the outer periphery of the mounting groove, and forms a step structure between the avoidance groove and the mounting groove.

[0029] By setting up an avoidance groove, during the process of injecting electrolyte, the electrolyte can spread on the inner bottom wall of the avoidance groove when it splashes, thereby improving the weld mark formed by the welding at the matching position between the main structure and the installation groove when the electrolyte splashes, and further improving the problem of failure of the welding position between the main structure and the first wall, thereby effectively maintaining the bonding strength between the first wall and the electrode terminal.

[0030] In some embodiments, the main structure includes:

[0031] A conductive member connected to the electrode assembly and covering the lead-out hole;

[0032] The connecting member surrounds the outer periphery of the conductive member, is limited in the installation groove, and is connected to the first wall; the second limiting portion is provided on the connecting member;

[0033] Insulating parts fix and separate the connecting parts and conductive parts.

[0034] By adopting the above technical solution, the second limiting portion is provided on the connecting member of the main structure, which facilitates the concave-convex fit between the second limiting portion and the first limiting portion to achieve the circumferential upper limit of the electrode terminal in the lead-out hole being located on the first wall.

[0035] In some embodiments, a connecting portion is provided on the outer circumference of the connecting member, and the connecting portion is limitedly engaged with the radial inner wall of the mounting groove in the lead-out hole; the connecting portion is connected to the first wall, and the second limiting portion is provided on the connecting portion;

[0036] In the axial direction of the lead-out hole, the size of the inner side wall of the mounting groove in the radial direction of the lead-out hole is greater than or equal to the size of the connecting portion.

[0037] By adopting this technical solution, the inner sidewall of the mounting groove protrudes from or is flush with the connecting portion in the axial direction of the lead-out hole. This, on the one hand, allows the mounting groove to stably and reliably retain the connecting portion, thereby ensuring that the electrode terminal is stably and reliably retained within the mounting groove, helping to improve the bonding strength between the electrode terminal and the first wall. On the other hand, this facilitates welding at the mating position between the connecting portion and the inner sidewall of the mounting groove, facilitating the electronic mounting of the electrode on the first wall.

[0038] In some embodiments, in the axial direction of the lead-out hole, a difference between a size of an inner sidewall of the mounting groove in the radial direction of the lead-out hole and a size of the connecting portion is ≤0.3 mm.

[0039] This arrangement allows the inner sidewall of the mounting groove to extend beyond or be flush with the connecting portion in the axial direction of the lead-out hole. This, on the one hand, helps to improve the bonding strength between the electrode terminal and the first wall. On the other hand, it facilitates welding at the mating position between the connecting portion and the inner sidewall of the mounting groove, thereby facilitating the electronic mounting of the electrode on the first wall.

[0040] In some embodiments, the main structure is disposed through the outlet hole, and a first limiting portion is disposed on an inner peripheral wall of the outlet hole.

[0041] By adopting the above technical solution, the first limiting portion and the second limiting portion can form a concave-convex fit at the inner peripheral wall of the lead-out hole.

[0042] In some embodiments, the main structure and the first wall are fixed by welding; and / or the first limiting portion and the second limiting portion are fixed by welding.

[0043] In this way, the electrode terminal and the first wall are easily combined, and the combination strength between the electrode terminal and the first wall is improved.

[0044] In some embodiments, there are multiple first limiting portions, and the multiple first limiting portions are spaced circumferentially around the outer circumference of the lead-out hole; there are multiple second limiting portions, and the multiple second limiting portions and the multiple first limiting portions are matched in a concave-convex manner.

[0045] Such a setting can improve the stability and reliability of the electrode terminal being limited to the first wall along the circumference of the lead-out hole, thereby helping to improve the bonding strength between the electrode terminal and the first wall, reduce the risk of the electrode terminal escaping from the first wall, and reduce the risk of connection failure between the electrode terminal and the motor assembly, thereby improving the reliability of the battery cell.

[0046] In some embodiments, the number of electrode terminals is two, and the two electrode terminals are respectively a positive electrode terminal and a negative electrode terminal; at least one of the number and structure of the second limiting parts of the positive electrode terminal is different from that of the negative electrode terminal.

[0047] By adopting the above technical solution, the second limiting part can achieve the anti-mistake effect of the electrode terminal, which can improve the problem of reverse installation of the positive electrode terminal and the negative electrode terminal, and can help reduce the scrap rate of battery cells and improve the yield rate of battery cells.

[0048] In a second aspect, an embodiment of the present application provides a battery comprising a battery cell.

[0049] The battery provided in the embodiments of the present application, by employing the battery cells described above, can improve the bonding strength between the electrode terminals and the first wall, thereby reducing the risk of the electrode terminals breaking free from their connection with the first wall and detaching from the first wall. Thus, the problem of the electrode terminals detaching from the first wall during battery cell charging, discharging, and testing can be alleviated, thereby improving the connection between the electrode terminals and the electrode assembly, thereby enhancing the stability and reliability of the battery cells, and thus, the stability and reliability of the battery.

[0050] In a third aspect, an embodiment of the present application provides an electrical device including a battery.

[0051] The electrical device provided in the embodiment of the present application, by adopting the above-mentioned battery, can improve the stability and reliability of the battery, thereby helping to improve the reliability of the electrical device.

[0052] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. 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 these drawings without any creative work.

[0054] Figure 1 A schematic diagram of a vehicle provided for some embodiments of the present application;

[0055] Figure 2 An exploded view of a battery provided for some embodiments of the present application;

[0056] Figure 3 A three-dimensional structural diagram of a battery cell provided in some embodiments of the present application;

[0057] Figure 4 An exploded view of a battery cell provided for some embodiments of the present application;

[0058] Figure 5 A three-dimensional structural diagram of the end cap and electrode terminal of a battery cell provided in some embodiments of the present application;

[0059] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0060] Figure 7 A three-dimensional structural diagram of an end cover of a battery cell provided in some embodiments of the present application;

[0061] Figure 8 for Figure 7 Enlarged view of point B in the middle;

[0062] Figure 9 A three-dimensional structural diagram of an electrode terminal of a battery cell provided in some embodiments of the present application;

[0063] Figure 10 Schematic diagrams of end caps and electrode terminals of battery cells provided in other embodiments of the present application;

[0064] Figure 11 for Figure 10 Enlarged view of point C in the middle;

[0065] Figure 12 for Figure 9 A top view of the provided electrode terminal;

[0066] Figure 13 for Figure 8 A partial top view of the end cap is provided;

[0067] Figure 14 An exploded view of an electrode terminal of a battery cell provided in some embodiments of the present application;

[0068] Figure 15 for Figure 14 A schematic diagram of a connector for an electrode terminal is provided;

[0069] Figure 16 for Figure 7 Cross-sectional view along DD;

[0070] Figure 17 for Figure 16 A partial enlarged view of .

[0071] Among them, the reference numerals in the figures are:

[0072] 1000 - vehicle; 100 - battery; 200 - controller; 300 - motor; 10 - battery cell; 20 - housing; 21 - first part; 22 - second part; 1 - electrode assembly; 2 - housing; 201 - lead-out hole; 202 - mounting slot; 203 - avoidance slot; 21 - housing; 22 - end cap; 221 - first wall; 2211 - first limiting portion; 22111 - first limiting slot; 22112 - second protrusion; 2212 - step structure; 3-electrode terminal; 31-main structure; 311-conductive part; 312-insulating part; 313-connecting part; 3131-connecting portion; 3132-main body; 32-second limiting portion; 321-first protrusion; 322-second limiting groove; 4-transfer structure; 5-patch; L1-first dimension; L2-second dimension; L3-third dimension; L4-fourth dimension; H1-fifth dimension; H2-sixth dimension; Z-axial direction; Y-circumferential direction; X-radial direction. DETAILED DESCRIPTION

[0073] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0074] In the description of this application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0075] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0076] In the description of this application, "a plurality of" means more than two, and unless otherwise specifically defined, "more than two" includes two. Accordingly, "a plurality of groups" means more than two groups, including two groups.

[0077] In the description of this application, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0078] In the description of this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist at the same time, and B exists. In addition, in this application, the character " / " generally indicates that the related objects are in an "or" relationship.

[0079] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

[0080] In the related art, a battery cell includes an electrode assembly, a housing, and electrode terminals. The electrode assembly is disposed within the housing. The electrode terminals are disposed on the housing and connected to the electrode assembly.

[0081] The bonding strength between the electrode terminals and the outer casing is weak, posing a risk of the electrode terminals detaching from the outer casing, leading to a failure in the connection between the electrode assembly and the electrode terminals. Specifically, during battery cell charge and discharge cycles and crash testing, the electrode terminals are subject to compression caused by the expansion of the electrode assembly. This can easily lead to the electrode terminals breaking free from their connection and detaching from the outer casing.

[0082] For example, when the electrode terminal is subjected to compression or the like, the electrode terminal tends to rotate relative to the housing, which makes the welding relationship between the electrode terminal and the housing susceptible to failure.

[0083] Based on the above considerations, embodiments of the present application provide a battery cell, a battery, and an electrical device. By means of a concave-convex fit between a first limiting portion on the first wall of the housing and a second limiting portion on the electrode terminal, the electrode terminal and the first wall are constrained in the circumferential direction of the lead-out hole, thereby limiting the rotation of the electrode terminal on the first wall and improving the position of the electrode terminal on the first wall. This can improve the bonding strength between the electrode terminal and the first wall, thereby reducing the risk of the electrode terminal breaking free from the connection between the electrode terminal and the first wall and detaching from the first wall, thereby improving the connection between the electrode terminal and the electrode assembly.

[0084] In some embodiments, the battery cells involved in the embodiments of the present application can be used in electrical devices that use battery cells or batteries as power sources.

[0085] The electrical devices involved in the embodiments of the present application may be, but are not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, vehicles, ships, spacecraft, and the like. Among them, electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, and the like. According to the power source, vehicles may be fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles may be pure electric vehicles, hybrid vehicles, or extended-range vehicles, and the like. According to the drive mode, vehicles may be front-wheel drive vehicles, rear-wheel drive vehicles, or four-wheel drive vehicles.

[0086] In other embodiments, the battery cells involved in the embodiments of the present application can also be used in energy storage systems that use battery cells or batteries as energy storage elements. The energy storage system may include energy storage containers, energy storage cabinets, etc.

[0087] The battery involved in the embodiments of the present application can be a single physical module comprising one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or in hybrid mode through a busbar. Hybrid mode refers to the multiple battery cells being connected in both series and parallel mode.

[0088] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0089] In some embodiments, the battery may be a battery pack, which may include a housing and battery cells. As an example, the battery cells may be directly housed in the housing. As an example, the battery cells may also be formed into a battery module first and then housed in the housing.

[0090] As an example, a plurality of battery cells may be fixed by cable ties or the like to form a battery module.

[0091] As an example, multiple battery cells may be fixed together by end plates, side plates, etc. to form a battery module.

[0092] The battery cells referred to in the embodiments of this application are the smallest units that store and output electrical energy. These cells can be secondary batteries or primary batteries. They can be, but are not limited to, metal batteries, lithium-sulfur batteries, sodium-ion batteries, or magnesium-ion batteries. They can be cylindrical, flat, rectangular, or other shapes.

[0093] For ease of description, the embodiments of the present application are described using a vehicle as an example of an electrical device.

[0094] In some embodiments, see Figure 1 , Figure 1 Schematic diagram of a vehicle 1000 provided in some embodiments of the present application. The aforementioned battery 100 is disposed within the vehicle 1000, and the battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 can also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, to meet the power requirements of the vehicle 1000 during startup, navigation, and driving.

[0095] In some embodiments, the battery 100 can serve not only as an operating power source for the vehicle 1000 , but also as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0096] In some embodiments, see Figure 2 , Figure 2 This is an exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 may include a housing 20 and a battery cell 10. The housing 20 is a structure having an internal space, and the internal space of the housing 20 is used to accommodate the battery cell 10.

[0097] The box body 20 can adopt a variety of structures. In some embodiments, the box body 20 can include a first part 21 and a second part 22, which cover each other and together define the interior space of the box body 20. The first part 21 can be a hollow structure with an opening at one end, and the second part 22 can be a plate-like structure, which covers the open side of the first part 21, so that the first part 21 and the second part 22 together define the interior space of the box body 20. Alternatively, please refer to Figure 2The first portion 21 and the second portion 22 may each be a hollow structure with an opening at one end, with the opening of the first portion 21 covering the opening of the second portion 22, so that the first portion 21 and the second portion 22 together define the interior space of the box body 20. The box body 20 composed of the first portion 21 and the second portion 22 may have various shapes, such as a cylinder, a cuboid, etc.

[0098] In some embodiments, see Figure 2 , multiple battery cells 10 can be connected in series, in parallel, or in a mixed connection to form a whole, and then the whole formed by the multiple battery cells 10 can be directly accommodated in the internal space of the box 20. In other embodiments, multiple battery cells 10 can also be connected in series, in parallel, or in a mixed connection first, and then arranged and fixed to form a battery module, and the battery module can be accommodated in the internal space of the box 20. In still other embodiments, multiple battery cells 10 can also be connected in series, in parallel, or in a mixed connection first, and then arranged and fixed to form multiple battery modules, and then the multiple battery modules can be connected in series, in parallel, or in a mixed connection to form a whole, and then accommodated in the internal space of the box 20.

[0099] In some embodiments, the housing 20 of the battery 100 may serve as part of the chassis structure of the vehicle 1000. For example, a portion of the housing 20 may form at least a portion of the chassis of the vehicle 1000, or a portion of the housing 20 may form at least a portion of a cross member or a longitudinal member of the vehicle 1000.

[0100] In some embodiments, please refer to Figure 3 and Figure 4 , Figure 3 This is a three-dimensional structural diagram of a battery cell 10 provided in some embodiments of the present application. Figure 4 for Figure 3 The battery cell 10 may include an electrode assembly 1, a housing 2, and an electrode terminal 3.

[0101] The electrode assembly 1 is the component in the battery cell 10 where the electrochemical reaction occurs. The electrode assembly 1 is primarily formed by winding or stacking a positive electrode sheet and a negative electrode sheet, with a separator provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active materials constitute the main body of the electrode assembly 1, while the portions of the positive and negative electrode sheets without active materials each constitute a tab. The tab of the positive electrode sheet is the positive tab, and the tab of the negative electrode sheet is the negative tab. The positive and negative tabs can be located together at one end of the main body or at opposite ends of the main body.

[0102] In the battery cell 10 , the number of electrode assemblies 1 may be one or more.

[0103] In some cases, the electrode assembly 1 may also be referred to as a bare cell, a wound body, a laminated body, etc.

[0104] In some embodiments, the battery cell 10 may further include an electrolyte, which functions to conduct ions between the positive electrode and the negative electrode. The electrolyte in the embodiments of the present application may be in liquid, gel, or solid form.

[0105] The housing 2 is a structure for defining the internal environment of the battery cell 10. The housing 2 is used to accommodate the electrode assembly 1 and the electrolyte.

[0106] In some embodiments, please refer to Figure 3 and Figure 4 The housing 2 may include a shell 21 and an end cap 22. The shell 21 and the end cap 22 are components for jointly defining the internal environment of the battery cell 10. The internal environment defined by the shell 21 and the end cap 22 is used to accommodate the electrode assembly 1 and the electrolyte. The shell 21 and the end cap 22 may be independent components. Specifically, Figure 3 and Figure 4 As shown, the housing 21 has an opening, and the end cap 22 is disposed over the opening of the housing 21 to define the internal environment of the battery cell 10 together with the housing 21 and isolate the internal environment of the battery cell 10 from the external environment. Alternatively, the housing 21 and the end cap 22 may be an integrated structure. Specifically, the end cap 22 and the housing 21 may form a common connection surface before the electrode assembly 1 is inserted into the housing. After the electrode assembly 1 is inserted into the housing, the end cap 22 is then placed over the housing 21 to seal the electrode assembly 1.

[0107] The number of the end cap 22 can be one, such as Figure 3 and Figure 4 Alternatively, the number of the end caps 22 may be two, and the two end caps 22 are respectively provided at opposite ends of the housing 21 .

[0108] The shell 21 may be cylindrical, square, or other shapes, depending on the shape and size of the electrode assembly 1. Furthermore, the shell 21 and the end cap 22 may be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic.

[0109] The electrode terminal 3 is a structure having conductive properties. The electrode terminal 3 is provided on the housing 2 and connected to the electrode assembly 1. The electrode terminal 3 serves as a current transmission end of the battery cell 10 for transmitting current.

[0110] The electrode terminal 3 is connected to the electrode assembly 1, specifically to the tab of the electrode assembly 1. The electrode terminal 3 and the tab can be directly connected by welding, bonding, etc.; or, Figure 4As shown, a transfer structure 4 can also be provided between the electrode terminal 3 and the tab. The transfer structure 4 is connected to the electrode terminal 3 and the tab to realize the transfer between the electrode terminal 3 and the tab so as to enable current flow, thereby indirectly realizing the connection between the electrode terminal 3 and the tab.

[0111] The transfer structure 4 refers to a metal structure with conductive properties, such as but not limited to a copper busbar.

[0112] In some embodiments, see Figure 4 There are two electrode terminals 3, the two electrode terminals 3 are respectively a positive electrode terminal and a negative electrode terminal, the positive electrode terminal is conductively connected to the positive electrode tab of the electrode assembly 1, and the negative electrode terminal is conductively connected to the negative electrode tab of the electrode assembly 1.

[0113] The electrode terminal 3 can be provided on the shell 21 of the housing 2 or on the end cover 22 of the housing 2. The positive electrode terminal and the negative electrode terminal can be provided on the shell 21 at the same time; or Figure 4 As shown, the positive electrode terminal and the negative electrode terminal are both provided on the end cover 22 ; alternatively, one of the positive electrode terminal and the negative electrode terminal is provided on the shell 21 , and the other is provided on the end cover 22 .

[0114] Among them, Figure 4 As shown, the positive electrode terminal and the negative electrode terminal can be provided at the same end of the housing 2. Alternatively, the positive electrode terminal and the negative electrode terminal can also be provided at opposite ends of the housing 2.

[0115] Please also refer to Figures 3 to 9 , Figure 5 The three-dimensional structure diagram of the end cover 22 and the electrode terminal 3 of the battery cell 10 provided in some embodiments of the present application, Figure 6 for Figure 5 The enlarged view of point A in the middle. Figure 5 and Figure 6 In the embodiment, the first wall 221 is provided on the end cover 22 , and the electrode terminal 3 is mounted on the end cover 22 . Figure 7 This is a three-dimensional structural diagram of the end cover 22 of the battery cell 10 provided in some embodiments of the present application. Figure 8 for Figure 7 The enlarged view of point B in the middle. Figure 9A three-dimensional structural diagram of the electrode terminal 3 of the battery cell 10 provided in some embodiments of the present application. The battery cell 10 provided in the embodiment of the present application includes an electrode assembly 1, a shell 2 and an electrode terminal 3. The electrode assembly 1 is arranged in the shell 2. The shell 2 includes a first wall 221, and the first wall 221 is provided with a lead-out hole 201 and a first limiting portion 2211. The electrode terminal 3 includes a main structure 31 and a second limiting portion 32, the main structure 31 is connected to the electrode assembly 1, and the second limiting portion 32 is provided on the main structure 31. The main structure 31 is connected to the first wall 221 and covers the lead-out hole 201. The first limiting portion 2211 and the second limiting portion 32 are matched in a concave and convex manner so that the electrode terminal 3 and the first wall 221 form a limit in the circumferential direction Y of the lead-out hole 201.

[0116] The first wall 221 is a solid wall on the housing 2 for mounting the electrode terminal 3 .

[0117] The shell 21 of the housing 2 may be provided with a first wall 221. Figures 5 to 7 As shown, the end cover 22 of the housing 2 may also be provided with a first wall 221 .

[0118] Among them, Figures 5 to 7 As shown, a first wall 221 is provided at one end of the housing 2, and the positive electrode terminal and the negative electrode terminal are installed on the first wall 221 at intervals, that is, the positive electrode terminal and the negative electrode terminal are provided at the same end of the housing 2. Alternatively, first walls 221 are provided at opposite ends of the housing 2, and the positive terminal and the negative terminal are respectively provided on the first walls 221 at opposite ends of the housing 2, that is, the positive electrode terminal and the negative electrode terminal are respectively provided at opposite ends of the housing 2.

[0119] The lead-out hole 201 is a through hole that passes through the first wall 221, and is used to connect the electrode terminal 3 to the electrode assembly 1 through the lead-out hole 201. The penetration direction of the lead-out hole 201 on the first wall 221 is the axial direction Z of the lead-out hole 201. Hereinafter, unless otherwise specified, the axial direction Z refers to the axial direction Z of the lead-out hole 201. It can be understood that in the axial direction Z of the lead-out hole 201, at least one end of the shell 2 is provided with a first wall 221. In the axial direction Z of the lead-out hole 201, the first wall 221 and the electrode assembly 1 are arranged relative to each other. In some cases, the axial direction Z of the lead-out hole 201 is the height direction of the battery cell 10.

[0120] The first limiting portion 2211 is a portion on the first wall 221 that is used for concave-convex cooperation with the second limiting portion 32 of the electrode terminal 3 .

[0121] The main structure 31 is the main body of the electrode terminal 3 , and the second limiting portion 32 is a portion provided on the main structure 31 for concave-convex cooperation with the first limiting portion 2211 .

[0122] The main structure 31 is connected to the first wall 221 and covers the lead-out hole 201, so that the electrode terminal 3 is mounted on the first wall 221. The main structure 31 covers the lead-out hole 201, so that the main structure 31 can be connected to the electrode assembly 1 through the lead-out hole 201.

[0123] The main structure 31 can be connected to the first wall 221 by, but not limited to, welding. For example, the main structure 31 can also be connected to the first wall 221 by riveting, bolting, or the like.

[0124] The main structure 31 may be directly connected to the electrode assembly 1 or indirectly connected to the electrode assembly 1 through the transition structure 4 to achieve connection between the electrode terminal 3 and the electrode assembly 1 .

[0125] The first limiting portion 2211 and the second limiting portion 32 cooperate with each other in a concave-convex manner to form a limit in the circumferential direction Y of the lead-out hole 201, thereby limiting the electrode terminal 3 and the first wall 221 in the circumferential direction Y of the lead-out hole 201. In other words, the first limiting portion 2211 and the second limiting portion 32 cooperate with each other in a concave-convex manner to limit the electrode terminal 3 on the first wall 221 along the circumferential direction Y of the lead-out hole 201.

[0126] The circumferential direction Y of the outlet hole 201 refers to the circumferential direction of the circle defined by the inner circumferential wall of the outlet hole 201 , and is perpendicular to the axial direction Z of the outlet hole 201 . Hereinafter, unless otherwise specified, the circumferential direction Y refers to the circumferential direction Y of the outlet hole 201 .

[0127] In the battery cell 10 provided in the embodiment of the present application, the first retaining portion 2211 on the first wall 221 of the housing 2 and the second retaining portion 32 on the electrode terminal 3 form a retaining position in the circumferential direction Y of the lead-out hole 201, thereby restricting the rotation of the electrode terminal 3 on the first wall 221 and improving the retaining position of the electrode terminal 3 on the first wall 221. This improves the bonding strength between the electrode terminal 3 and the first wall 221, reducing the risk of the electrode terminal 3 breaking free from the connection between the electrode terminal 3 and the first wall 221 and causing the electrode terminal 3 to detach from the first wall 221. It also reduces the risk of the connection between the electrode terminal 3 and the motor 300 assembly failing. Consequently, the problem of the electrode terminal 3 being dislodged from the first wall 221 during charging, discharging, and testing of the battery cell 10 can be alleviated. This improves the connection between the electrode terminal 3 and the electrode assembly 1, thereby enhancing the stability and reliability of the battery cell 10.

[0128] Furthermore, by providing the first stopper 2211 and the second stopper 32, the concave-convex fit of the first stopper 2211 and the second stopper 32 allows the electrode terminal 3 to be pre-positioned on the first wall 221 during installation of the electrode terminal 3 on the first wall 221, thereby ensuring that the electrode terminal 3 is stably retained on the first wall 221. This can alleviate the problem of positional fluctuation during connection of the main structure 31 to the first wall 221, facilitate the connection of the main structure 31 to the first wall 221, and improve the connection quality between the main structure 31 and the first wall 221. For example, the concave-convex fit of the first stopper 2211 and the second stopper 32 allows the electrode terminal 3 to be pre-positioned on the first wall 221, thereby ensuring a certain degree of positional stability of the electrode terminal 3 on the first wall 221, facilitating welding between the main structure 31 and the first wall 221, and improving the reliability of the battery cell 10.

[0129] In some embodiments, please refer to Figures 3 to 11 , and combined with other drawings. Among them, Figure 10 Schematic diagrams of the end cap 22 and the electrode terminal 3 of the battery cell 10 provided in some other embodiments of the present application, specifically schematic diagrams of the end cap 22 and the electrode terminal 3 in the axial direction Z of the lead-out hole 201, that is, Figure 10 In the figure, the electrode terminal 3 and the end cover 22 are perpendicular to the axial direction Z of the lead-out hole 201. Figure 11 for Figure 10 Enlarged view of point C in the middle. Figure 10 and Figure 11 In the embodiment, the first wall 221 is provided on the end cap 22, and the electrode terminal 3 is mounted on the end cap 22. One of the first limiting portion 2211 and the second limiting portion 32 comprises a limiting groove, and the other comprises a protrusion. In the circumferential direction Y of the lead-out hole 201, the protrusion is retained within the limiting groove.

[0130] Understandably, in some possible designs, such as Figures 5 to 9 As shown in the figures, and in conjunction with other figures, the first limiting portion 2211 includes a limiting groove, which is a first limiting groove 22111, and is provided on the first wall 221. The second limiting portion 32 includes a protrusion, which is a first protrusion 321, and is connected to the main structure 31. In the circumferential direction Y of the outlet hole 201, the first protrusion 321 is confined within the first limiting groove 22111.

[0131] The first limiting groove 22111 can be spaced apart from the lead-out hole 201, such as Figure 7 and Figure 8The first limiting groove 22111 may also be connected to the outlet hole 201 , for example, the first limiting groove 22111 is provided on the inner peripheral wall of the outlet hole 201 .

[0132] Among some possible designs, such as Figure 10 and Figure 11 As shown in the figure, and in conjunction with other figures, the first limiting portion 2211 includes a protrusion, which is the second protrusion 22112. The second limiting portion 32 includes a limiting groove, which is the second limiting groove 322. The second limiting groove 322 is provided on the main structure 31. In the circumferential direction Y of the lead-out hole 201, the second protrusion 22112 is retained within the second limiting groove 322.

[0133] The second protrusion 22112 may be spaced apart from the outlet hole 201 , or may be disposed on the inner peripheral wall of the outlet hole 201 .

[0134] The main structure 31 is connected to the first wall 221 , and may be connected to at least one of the first protrusion 321 of the first wall 221 and other portions of the first wall 221 except the first protrusion 321 .

[0135] By positioning the protrusion within the limiting groove at the upper circumferential Y-axis limit of the lead-out hole 201, a concave-convex fit between the first limiting portion 2211 and the second limiting portion 32 can be achieved, thereby achieving the effect of positioning the electrode terminal 3 at the upper circumferential Y-axis limit of the lead-out hole 201 on the first wall 221, thereby improving the bonding strength between the electrode terminal 3 and the first wall 221. Furthermore, there are many options for the concave-convex fit between the first limiting portion 2211 and the second limiting portion 32, providing great flexibility.

[0136] In some embodiments, please refer to Figures 5 to 11 , and in conjunction with other figures. In the axial direction Z of the outlet hole 201, a mounting groove 202 is provided on one side of the first wall 221. The mounting groove 202 is disposed around the outer periphery of the outlet hole 201, and the first stopper 2211 is disposed on the inner wall of the mounting groove 202. In the radial direction X of the outlet hole 201, the main structure 31 is confined within the mounting groove 202.

[0137] The mounting groove 202 refers to a groove provided on one side of the first wall 221 for limiting and mounting the main structure 31 .

[0138] The inner wall of the mounting groove 202 may include the inner wall of the mounting groove 202 in the axial direction Z of the outlet hole 201 (which may be referred to as the inner bottom wall of the outlet hole 201), or may include the inner side wall of the mounting groove 202 in the radial direction X of the outlet hole 201 (which may be referred to as the inner side wall of the outlet hole 201). It is understandable that the first limiting portion 2211 may be provided on the inner wall of the mounting groove 202 in the axial direction Z of the outlet hole 201; or may be provided on the inner side wall of the mounting groove 202 in the radial direction X of the outlet hole 201, as shown in FIG. Figures 5 to 7 shown.

[0139] The radial direction X of the outlet hole 201 is the radius direction of the circle defined by the inner peripheral wall of the outlet hole 201. Hereinafter, unless otherwise specified, the radial direction X refers to the radial direction X of the outlet hole 201.

[0140] The main structure 31 is located in the mounting groove 202 along the radial direction X of the lead-out hole 201 and is connected to the first wall 221 , so that the electrode terminal 3 is mounted on the first wall 221 .

[0141] By providing the mounting groove 202 on one side of the first wall 221 in the axial direction Z of the lead-out hole 201, and the first limiting portion 2211 being provided on the inner wall of the mounting groove 202, and the main body structure 31 being limited within the mounting groove 202 along the radial direction X of the lead-out hole 201, the main body structure 31 can be limited within the mounting groove 202 during the process of installing the electrode terminal 3 on the first wall 221, thereby achieving pre-positioning of the main body structure 31 within the mounting groove 202, that is, achieving pre-positioning of the electrode terminal 3 on the first wall 221. Furthermore, when limiting the main body structure 31 within the mounting groove 202, the first limiting portion 2211 and the second limiting portion 32 can also be used to achieve the concave-convex fit, thereby also achieving pre-positioning of the electrode terminal 3 on the first wall 221. In this manner, by constraining the main structure 31 within the mounting groove 202, the first limiting portion 2211 and the second limiting portion 32 cooperate in a concave-convex manner to achieve pre-positioning of the electrode terminal 3 on the first wall 221, thereby stably constraining the electrode terminal 3 on the first wall 221. This facilitates a stable connection between the main structure 31 and the first wall 221, facilitating the installation of the electrode terminal 3 on the first wall 221. Furthermore, the connection quality between the electrode terminal 3 and the first wall 221 is improved, thereby enhancing the bonding strength between the electrode terminal 3 and the first wall 221, reducing the risk of the electrode terminal 3 detaching from the first wall 221, and reducing the risk of connection failure between the electrode terminal 3 and the motor 300 assembly.

[0142] Furthermore, a mounting groove 202 is provided on one side of the first wall 221 in the axial direction Z of the lead-out hole 201, so that one end of the mounting groove 202 is open in the axial direction Z of the lead-out hole 201. This facilitates the main structure 31 to be confined within the mounting groove 202, thereby facilitating the installation of the electrode terminal 3 on the first wall 221.

[0143] In some embodiments, please refer to Figures 5 to 11 In the axial direction Z of the lead-out hole 201 , the mounting groove 202 is provided on a side of the first wall 221 away from the electrode assembly 1 .

[0144] It can be understood that in the axial direction Z of the lead-out hole 201 , the mounting groove 202 is open at one end away from the electrode assembly 1 .

[0145] This arrangement, on the one hand, allows the main structure 31 to be confined within the mounting groove 202, allowing the electrode terminal 3 to be mounted on the first wall 221. The main structure 31 can be exposed to the outside of the battery cell 10 through the mounting groove 202, thereby facilitating connection between the main structure 31 and external conductive components. On the other hand, it facilitates the mounting of the electrode terminal 3 on the first wall 221.

[0146] In some embodiments, please refer to Figures 5 to 9 , and in conjunction with other figures. The first limiting portion 2211 includes a limiting groove, which is the first limiting groove 22111. In the radial direction X of the outlet hole 201, the limiting groove of the first limiting portion 2211 is provided on the inner sidewall of the mounting groove 202. In the axial direction Z of the outlet hole 201, the limiting groove of the first limiting portion 2211 extends through the side of the first wall 221 having the mounting groove 202.

[0147] As an example, Figures 5 to 9 As shown, in the axial direction Z of the lead-out hole 201, the limiting groove of the first limiting portion 2211 passes through the side of the first wall 221 away from the electrode assembly 1. That is, in the axial direction Z of the lead-out hole 201, the limiting groove of the first limiting portion 2211 is open on the side away from the electrode assembly 1.

[0148] Correspondingly, the second limiting portion 32 includes a convex portion, and the convex portion of the second limiting portion 32 is a first convex portion 321. In the circumferential direction Y of the outlet hole 201, the first convex portion 321 is limited in the first limiting groove 22111.

[0149] Because the limiting groove of the first limiting portion 2211 extends through the side of the first wall 221 having the mounting groove 202 in the axial direction Z of the lead-out hole 201, when the main structure 31 is limited within the mounting groove 202, the protrusion on the second limiting portion 32 engages with the limiting groove of the first limiting portion 2211 in a concave-convex manner, and the protrusion is exposed outside the limiting groove, thereby allowing the mating position between the protrusion and the limiting groove to be exposed to the outside of the electrode terminal 3. This facilitates welding at the mating position between the protrusion and the limiting groove to achieve a connection between the first limiting portion 2211 and the second limiting portion 32, thereby improving the bonding strength between the electrode terminal 3 and the first wall 221, reducing the risk of the electrode terminal 3 detaching from the first wall 221, and reducing the risk of connection failure between the electrode terminal 3 and the motor 300 assembly.

[0150] Furthermore, in some cases, the main structure 31 is restrained within the mounting groove 202, and the mating locations between the main structure 31 and the mounting groove 202 are welded to achieve the connection between the main structure 31 and the first wall 221. Specifically, the main structure 31 is welded within the mounting groove 202, and the first retaining portion 2211 is welded to the second retaining portion 32 of the main structure 31. In this way, the weld mark formed by the mating location between the protrusion and the retaining groove increases the length of the weld mark between the electrode terminal 3 and the first wall 221, thereby increasing the bonding strength between the electrode terminal 3 and the first wall 221, reducing the risk of the electrode terminal 3 detaching from the first wall 221, and improving the reliability of the battery cell 10.

[0151] In some embodiments, the limiting groove of the first limiting portion 2211 may also be set on the bottom wall of the installation groove 202.

[0152] In some embodiments, please refer to Figure 10 and Figure 11 , and in conjunction with other figures. The second limiting portion 32 includes a limiting groove, which is provided on the main structure 31 and is a second limiting groove 322. In the axial direction Z of the lead-out hole 201, the limiting groove of the second limiting portion 32 passes through the portion of the main structure 31 having the limiting groove.

[0153] Correspondingly, the first limiting portion 2211 includes a convex portion, and the convex portion of the first limiting portion 2211 is the second convex portion 22112. In the circumferential direction Y of the outlet hole 201, the second convex portion 22112 is limited in the second limiting groove 322.

[0154] The protrusion of the first limiting portion 2211 may be disposed on the inner bottom wall of the installation groove 202 , or may be disposed on the inner side wall of the installation groove 202 .

[0155] The portion of the main structure 31 having the limiting groove may be, but is not limited to, the connection portion 3131 mentioned below. It is understood that the limiting groove of the second limiting portion 32 is provided on the connection portion 3131 and passes through the connection portion 3131 along the axial direction Z of the lead-out hole 201 .

[0156] The limiting groove of the second limiting portion 32 may or may not pass through the outer wall of the connecting portion 3131. As an example, Figure 10 and Figure 11 As shown, the limiting groove of the second limiting portion 32 passes through the connecting portion 3131 along the axial direction Z of the lead-out hole 201 , and passes through the outer wall of the connecting portion 3131 along the radial direction X of the lead-out hole 201 .

[0157] Because the limiting groove of the second limiting portion 32 extends through the portion of the main structure 31 having the limiting groove in the axial direction Z of the lead-out hole 201, when the main body is limited within the mounting groove 202, the protrusion on the first limiting portion 2211 engages with the limiting groove of the second limiting portion 32 in a concave-convex manner, and the protrusion is exposed outside the limiting groove, thereby allowing the mating position between the protrusion and the limiting groove to be exposed to the outside of the electrode terminal 3. This facilitates welding at the mating position between the protrusion and the limiting groove to achieve a connection between the first limiting portion 2211 and the second limiting portion 32, thereby improving the bonding strength between the electrode terminal 3 and the first wall 221, reducing the risk of the electrode terminal 3 detaching from the first wall 221, and reducing the risk of connection failure between the electrode terminal 3 and the motor 300 assembly.

[0158] Furthermore, in some cases, the main structure 31 is restrained within the mounting groove 202, and the mating locations between the main structure 31 and the mounting groove 202 are welded to achieve the connection between the main structure 31 and the first wall 221. Specifically, the main structure 31 is welded within the mounting groove 202, and the first retaining portion 2211 is welded to the second retaining portion 32 of the main structure 31. In this way, the weld mark formed by the mating location between the protrusion and the retaining groove increases the length of the weld mark between the electrode terminal 3 and the first wall 221, thereby increasing the bonding strength between the electrode terminal 3 and the first wall 221, reducing the risk of the electrode terminal 3 detaching from the first wall 221, and improving the reliability of the battery cell 10.

[0159] In some embodiments, see Figure 12 , and combined with other drawings. Among them, Figure 12 for Figure 9 The top view of the electrode terminal 3 provided is specifically a schematic diagram of the electrode terminal 3 in the axial direction Z of the lead-out hole 201. Figure 9 In the embodiment, the electrode terminal 3 is perpendicular to the axial direction Z of the lead-out hole 201. In the radial direction X of the lead-out hole 201, the size of the protrusion ranges from 1 mm to 10 mm.

[0160] It can be understood that the size of the protrusion in the radial direction X of the lead-out hole 201 is a first size L1. The first size L1 ranges from 1 mm to 10 mm, and can specifically be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, etc.

[0161] When the second limiting portion 32 includes the first protrusion 321, the dimension of the first protrusion 321 in the radial direction X of the outlet hole 201 is the first dimension L1. When the first limiting portion 2211 includes the second protrusion 22112, the dimension of the second protrusion 22112 in the radial direction X of the outlet hole 201 is the first dimension L1.

[0162] In some embodiments, please participate Figure 12 In conjunction with other drawings, in the circumferential direction Y of the lead-out hole 201 , the size of the protrusion ranges from 1 mm to 10 mm.

[0163] It is understandable that the size of the protrusion in the circumferential direction Y of the outlet hole 201 is a second size L2. The second size L2 ranges from 1 mm to 10 mm, and can specifically be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, etc.

[0164] When the second limiting portion 32 includes the first protrusion 321, the dimension of the first protrusion 321 in the circumferential direction Y of the outlet hole 201 is the second dimension L2. When the first limiting portion 2211 includes the second protrusion 22112, the dimension of the second protrusion 22112 in the circumferential direction Y of the outlet hole 201 is the second dimension L2.

[0165] By adopting the above technical solution, the protrusion has a relatively suitable size. On the one hand, when the protrusion and the retaining groove are matched, the protrusion can be reliably and stably located within the retaining groove along the circumferential Y direction of the lead-out hole 201. As a result, the electrode terminal 3 can be reliably and stably located on the first wall 221 along the circumferential Y direction of the lead-out hole 201. This improves the bonding strength between the electrode terminal 3 and the first wall 221, reduces the risk of the electrode terminal 3 detaching from the first wall 221, and reduces the risk of connection failure between the electrode terminal 3 and the motor 300 assembly. On the other hand, the weight and volume of the electrode terminal 3 and the first wall 221 are not excessively increased, thereby helping to ensure the energy density of the battery cell 10 to a certain extent.

[0166] In some embodiments, see Figure 12 In conjunction with other drawings, in the radial direction X of the lead-out hole 201 , the size of the convex portion ranges from 3 mm to 5 mm.

[0167] It can be understood that the first size L1 ranges from 3 mm to 5 mm, and can specifically be 3 mm, 3.2 mm, 3.5 mm, 3.8 mm, 4 mm, 4.3 mm, 4.5 mm, 4.7 mm, 5 mm, etc.

[0168] In some embodiments, see Figure 12 In conjunction with other drawings, in the circumferential direction Y of the lead-out hole 201 , the size of the protrusion ranges from 3 mm to 5 mm.

[0169] It can be understood that the second size L2 ranges from 3 mm to 5 mm, and can specifically be 3 mm, 3.2 mm, 3.5 mm, 3.8 mm, 4 mm, 4.3 mm, 4.5 mm, 4.7 mm, 5 mm, etc.

[0170] By adopting the above technical solution, the protrusion has a relatively suitable size. On the one hand, it allows the protrusion to be reliably and stably located within the retaining groove along the circumferential Y direction of the lead-out hole 201, thereby allowing the electrode terminal 3 to be reliably and stably located on the first wall 221 along the circumferential Y direction of the lead-out hole 201. This improves the bonding strength between the electrode terminal 3 and the first wall 221, reduces the risk of the electrode terminal 3 detaching from the first wall 221, and reduces the risk of connection failure between the electrode terminal 3 and the motor 300 assembly. On the other hand, it helps to ensure the energy density of the battery cell 10 to a certain extent.

[0171] In some embodiments, please refer to Figure 12 and Figure 13 , and combined with other drawings. Among them, Figure 13 for Figure 8 The partial top view of the end cover 22 provided is specifically a partial schematic view of the end cover 22 in the axial direction Z of the outlet hole 201. Figure 9 In the embodiment, the end cap 22 is perpendicular to the axial direction Z of the outlet hole 201. In the radial direction X of the outlet hole 201, the size of the limiting groove is larger than the size of the protrusion, and the size difference between the limiting groove and the protrusion is 0.02-0.1 mm.

[0172] It can be understood that in the radial direction X of the lead-out hole 201, the dimension of the limiting groove is a third dimension L3. The third dimension L3 is greater than the first dimension L1, and the difference between the third dimension L3 and the first dimension L1 is in the range of 0.02 to 0.1 mm, specifically 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, etc.

[0173] When the first limiting portion 2211 includes a first limiting groove 22111, the dimension of the first limiting groove 22111 in the radial direction X of the outlet hole 201 is a third dimension L3. The third dimension L3 of the first limiting groove 22111 is greater than the first dimension L1 of the first protrusion 321, and the difference between the third dimension L3 of the first limiting groove 22111 and the first dimension L1 of the first protrusion 321 is in the range of 0.02 to 0.1 mm. When the second limiting portion 32 includes a second limiting groove 322, the dimension of the second limiting groove 322 in the radial direction X of the outlet hole 201 is a third dimension L3. The third dimension L3 of the second limiting groove 322 is greater than the first dimension L1 of the second protrusion 22112, and the difference between the third dimension L3 of the second limiting groove 322 and the first dimension L1 of the second protrusion 22112 is in the range of 0.02 to 0.1 mm.

[0174] In some embodiments, please refer to Figure 12 and Figure 13 In the circumferential direction Y of the lead-out hole 201 , the size of the limiting groove is larger than the size of the convex portion, and the size difference between the limiting groove and the convex portion is 0.02-0.1 mm.

[0175] It can be understood that the dimension of the limiting groove in the circumferential direction Y of the lead-out hole 201 is a fourth dimension L4. The fourth dimension L4 is greater than the second dimension L2, and the difference between the fourth dimension L4 and the second dimension L2 is in the range of 0.02 to 0.1 mm, and can specifically be 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, etc.

[0176] When the first limiting portion 2211 includes a first limiting groove 22111, the dimension of the first limiting groove 22111 in the circumferential direction Y of the outlet hole 201 is a fourth dimension L4. The fourth dimension L4 of the first limiting groove 22111 is greater than the second dimension L2 of the first protrusion 321, and the difference between the fourth dimension L4 of the first limiting groove 22111 and the second dimension L2 of the first protrusion 321 is in the range of 0.02 to 0.1 mm. When the second limiting portion 32 includes a second limiting groove 322, the dimension of the second limiting groove 322 in the circumferential direction Y of the outlet hole 201 is a fourth dimension L4. The fourth dimension L4 of the second limiting groove 322 is greater than the second dimension L2 of the second protrusion 22112, and the difference between the fourth dimension L4 of the second limiting groove 322 and the second dimension L2 of the second protrusion 22112 is in the range of 0.02 to 0.1 mm.

[0177] By adopting the above technical solution, a relatively suitable size difference is achieved between the limiting groove and the protrusion. On the one hand, this facilitates the concave-convex fit between the protrusion and the limiting groove, and on the other hand, it enables the protrusion to be stably and reliably restrained in the limiting groove, thereby facilitating the pre-positioning and connection between the electrode terminal 3 and the first wall 221.

[0178] In some embodiments, please refer to Figure 6 、 Figure 8 and Figure 13 , and in conjunction with other figures. In the axial direction Z of the outlet hole 201, a relief groove 203 is provided on the side of the first wall 221 with the mounting groove 202. The inner wall of the relief groove 203 is located between the side of the first wall 221 with the mounting groove 202 and the inner wall of the mounting groove 202. The relief groove 203 is provided around the outer periphery of the mounting groove 202, and a step structure 2212 is formed between the relief groove 203 and the mounting groove 202.

[0179] Specifically, if Figure 6 、 Figure 8 and Figure 13 As shown, in the axial direction Z of the outlet hole 201, one side of the first wall 221 is provided with a mounting groove 202 and an escape groove 203. In the axial direction Z of the outlet hole 201, the inner wall of the escape groove 203 (referred to as the inner bottom wall of the escape groove 203) is located between the side of the first wall 221 having the mounting groove 202 and the inner wall of the mounting groove 202 (referred to as the inner bottom wall of the mounting groove 202).

[0180] As an example, Figure 6 、 Figure 8 and Figure 13 As shown, and in combination with other figures, in the axial direction Z of the lead-out hole 201, the side of the first wall 221 away from the electrode assembly 1 is provided with a mounting groove 202 and an avoidance groove 203. In the axial direction Z of the lead-out hole 201, the inner bottom wall of the avoidance groove 203 is located between the inner bottom wall of the mounting groove 202 and the side of the first wall 221 away from the electrode assembly 1. Based on this, in the axial direction Z of the lead-out hole 201, the inner bottom wall of the mounting groove 202 is located between the electrode assembly 1 and the inner bottom wall of the avoidance groove 203.

[0181] By setting up the avoidance groove 203, during the process of injecting the electrolyte, the electrolyte can spread on the inner bottom wall of the avoidance groove 203 when it splashes, thereby improving the problem of contamination of the weld mark formed by the welding at the matching position between the main structure 31 and the installation groove 202 when the electrolyte splashes, and further improving the problem of failure of the welding position between the main structure 31 and the first wall 221, thereby effectively maintaining the bonding strength between the first wall 221 and the electrode terminal 3.

[0182] In some cases, the battery cell 10 may further include a patch 5, which is attached to the side of the first wall 221 away from the electrode assembly 1 to cover the mounting groove 202 and the avoidance groove 203. Thus, by providing the avoidance groove 203, the problem of weld marks formed by welding at the mating position between the main structure 31 and the mounting groove 202 interfering with the patch 5 can be improved, thereby improving the adhesion of the patch 5 to the first wall 221.

[0183] In some embodiments, as Figure 7 and Figure 8 As shown, the first limiting groove 22111 is provided on the inner side wall of the installation groove 202 , and along the radial direction X of the lead-out hole 201 , the first limiting groove 22111 passes through the step structure 2212 .

[0184] In some embodiments, the avoidance groove 203 may not be provided on the first wall 221 .

[0185] In some embodiments, please refer to Figure 6 、 Figure 9 and Figure 14 , and combined with other drawings. Among them, Figure 14 Exploded view of the electrode terminal 3 of the battery cell 10 provided in some embodiments of the present application. The main structure 31 includes a conductive member 311, a connector 313, and an insulating member 312. The conductive member 311 is connected to the electrode assembly 1 and covers the lead-out hole 201. The connector 313 surrounds the outer periphery of the conductive member 311 and is confined within the mounting groove 202. The connector 313 is connected to the first wall 221. The second limiting portion 32 is provided on the connector 313. The insulating member 312 fixes and separates the connector 313 and the conductive member 311.

[0186] The conductive member 311 is a component of the main structure 31 used to connect to the electrode terminal 3. The conductive member 311 covers the lead-out hole 201, so that the conductive member 311 can be connected to the electrode assembly 1 through the lead-out hole 201.

[0187] When the electrode terminal 3 is a positive electrode terminal, the conductive member 311 of the electrode terminal 3 may be an aluminum structure. When the electrode terminal 3 is a negative electrode terminal, the conductive member 311 of the electrode terminal 3 may be a copper-aluminum composite structure.

[0188] The connecting member 313 is a component of the main structure 31 used to connect to the first wall 221. The connecting member 313 can be a metal member, and the connecting member 313 is connected to the first wall 221 by welding.

[0189] The insulating member 312 is a component of the main structure 31 used to secure and separate the conductive member 311 and the connector 313. Specifically, the insulating member 312 surrounds the outer periphery of the conductive member 311 and is connected between the connector 313 and the conductive member 311. Thus, by connecting the insulating member 312 to the connector 313 and the conductive member 311, the connector 313 and the conductive member 311 are secured. By placing the insulating member 312 between the connector 313 and the conductive member 311, the connector 313 and the conductive member 311 are separated, thereby achieving an insulation effect between the connector 313 and the conductive member 311.

[0190] The insulating member 312 may be, but is not limited to, a plastic member, and may be, but is not limited to, connected between the conductive member 311 and the connecting member 313 by integral injection molding.

[0191] The connecting member 313 is limited within the mounting groove 202, specifically, the connecting member 313 is limited within the mounting groove 202 along the radial direction of the outlet hole 201. It can be understood that the connecting member 313 and the inner sidewall of the mounting groove 202 are limited and cooperated so that the connecting member 313 is located within the mounting groove 202 along the radial direction of the outlet hole 201, thereby ensuring that the main structure 31 is located within the mounting groove 202 along the radial direction of the outlet hole 201.

[0192] The main structure 31 is positioned within the mounting groove 202 along the radial direction of the outlet hole 201. This means that the main structure 31 is positioned within the mounting groove 202 along the radial direction of the outlet hole 201. Specifically, the main structure 31 is positioned within the mounting groove 202 along the radial direction of the outlet hole 201. This means that the main structure 31 is positioned within the mounting groove 202 via the connector 313.

[0193] The matching position between the main structure 31 and the installation groove 202 includes the matching position between the connecting piece 313 and the inner side wall of the installation groove 202 .

[0194] By adopting the above technical solution, the second limiting portion 32 is arranged on the connecting piece 313 of the main structure 31, which facilitates the concave-convex matching of the second limiting portion 32 and the first limiting portion 2211, so as to realize that the electrode terminal 3 is positioned on the first wall 221 at the circumferential Y upper limit of the lead-out hole 201.

[0195] In some embodiments, please refer to Figure 6 、 Figure 8 、 Figures 14 to 17 , and combined with other drawings. Among them, Figure 15 for Figure 14 A schematic diagram of the connector 313 of the electrode terminal 3 is provided, Figure 14 The electrode terminal 3 is parallel to the axial direction Z of the lead-out hole 201. Figure 16 for Figure 7Cross-sectional view along DD, Figure 17 for Figure 16 A partial enlarged view. A connecting portion 3131 is provided on the outer circumference of the connector 313. This portion 3131 engages with the inner sidewall of the mounting groove 202 in the radial direction X of the outlet hole 201 to limit position. The connecting portion 3131 is connected to the first wall 221, and the second limiting portion 32 is provided on the connecting portion 3131. In the axial direction Z of the outlet hole 201, the dimension of the inner sidewall of the mounting groove 202 in the radial direction X of the outlet hole 201 is greater than or equal to the dimension of the connecting portion 3131.

[0196] It can be understood that the connection portion 3131 is engaged with the inner sidewall of the mounting groove 202 so that the connection member 313 is located within the mounting groove 202 along the radial X limit of the lead-out hole 201, thereby allowing the main structure 31 to be located within the mounting groove 202 along the radial X limit of the lead-out hole 201. In other words, the connection portion 3131 is the portion of the connection member 313 that is used to engage with the inner sidewall of the mounting groove 202.

[0197] Specifically, the connecting portion 3131 is also a portion of the connecting member 313 used to connect with the first wall 221 .

[0198] In the axial direction Z of the outlet hole 201, the dimension of the inner sidewall of the mounting groove 202 in the radial direction X of the outlet hole 201 is the dimension of the inner sidewall of the mounting groove 202 in the axial direction Z of the outlet hole 201, which is a fifth dimension H1. In the axial direction Z of the outlet hole 201, the dimension of the connecting portion 3131 is a sixth dimension H2. The fifth dimension H1 ≥ the sixth dimension H2.

[0199] By adopting the above technical solution, the inner sidewall of the mounting groove 202 protrudes from or is flush with the connecting portion 3131 in the axial direction Z of the lead-out hole 201. This, on the one hand, allows the mounting groove 202 to stably and reliably limit the connecting portion 3131, thereby stably and reliably retaining the electrode terminal 3 within the mounting groove 202, thereby improving the bonding strength between the electrode terminal 3 and the first wall 221. On the other hand, welding is facilitated at the mating position between the connecting portion 3131 and the inner sidewall of the mounting groove 202, thereby facilitating the mounting of the electrode terminal 3 on the first wall 221.

[0200] Understandably, if Figure 6 、 Figure 8 and Figures 14 to 17 As shown in the figure, and in conjunction with other figures, the connector 313 also includes a body portion 3132, which is the main part of the connector 313. The body portion 3132 surrounds the outer periphery of the conductive member 311, and the insulating member 312 is connected between the body portion 3132 and the conductive member 311. The connector 3131 is connected to the outer periphery of the body portion 3132.

[0201] In some embodiments, please refer to Figures 14 to 17 In the axial direction Z of the outlet hole 201 , the difference between the size of the inner side wall of the mounting groove 202 in the radial direction X of the outlet hole 201 and the size of the connecting portion 3131 is ≤0.3 mm.

[0202] It can be understood that the fifth dimension H1 is greater than or equal to the sixth dimension H2, and less than or equal to 0.3 mm. That is, the difference between the fifth dimension H1 and the sixth dimension H2 is in the range of 0 to 0.3 mm, and can specifically be 0, 0.02 mm, 0.04 mm, 0.05 mm, 0.07 mm, 0.09 mm, 0.1 mm, 0.12 mm, 0.15 mm, 0.17 mm, 0.18 mm, 0.2 mm, 0.22 mm, 0.25 mm, 0.28 mm, 0.3 mm, etc.

[0203] This arrangement allows the inner sidewall of the mounting groove 202 to extend beyond or be flush with the connecting portion 3131 in the axial direction Z of the lead-out hole 201. This, on the one hand, helps to improve the bonding strength between the electrode terminal 3 and the first wall 221. On the other hand, it facilitates welding at the mating position between the connecting portion 3131 and the inner sidewall of the mounting groove 202, thereby facilitating the mounting of the electrode terminal on the first wall 221.

[0204] In some embodiments, the main structure 31 passes through the outlet hole 201 , and a first limiting portion 2211 is provided on the inner peripheral wall of the outlet hole 201 .

[0205] Correspondingly, the second limiting portion 32 is arranged on the outer peripheral wall of the main structure 31, so that when the main structure 31 is passed through the lead-out hole 201, the first limiting portion 2211 and the second limiting portion 32 are matched in a concave-convex manner, so that the electrode terminal 3 is limited on the first wall 221 along the circumferential direction Y of the lead-out hole 201.

[0206] When the first limiting portion 2211 includes a limiting groove, the limiting groove of the first limiting portion 2211 is the first limiting groove 22111. The first limiting groove 22111 is provided on the inner circumferential wall of the outlet hole 201. Accordingly, the second limiting portion 32 includes a protrusion, which is the first protrusion 321. The first protrusion 321 is provided on the portion of the main structure 31 located within the outlet hole 201. In the circumferential direction Y of the outlet hole 201, the first protrusion 321 is confined within the first limiting groove 22111.

[0207] When the second limiting portion 32 includes a limiting groove, the limiting groove of the second limiting portion 32 is a second limiting groove 322, which is disposed in the portion of the main structure 31 located within the outlet hole 201. Accordingly, the first limiting portion 2211 includes a protrusion, which is a second protrusion 22112, disposed on the inner circumferential wall of the outlet hole 201. In the circumferential direction Y of the outlet hole 201, the second protrusion 22112 is constrained within the second limiting groove 322.

[0208] By adopting the above technical solution, the first limiting portion 2211 and the second limiting portion 32 can form a concave-convex fit on the inner peripheral wall of the outlet hole 201.

[0209] In some embodiments, the main structure 31 and the first wall 221 are fixed by welding.

[0210] In this way, the main structure 31 and the first wall 221 are connected more easily and the bonding strength between the main structure 31 and the first wall 221 is improved, that is, the bonding strength between the electrode terminal 3 and the first wall 221 is improved.

[0211] In some embodiments, the first limiting portion 2211 and the second limiting portion 32 are fixed by welding.

[0212] In this way, the bonding strength between the electrode terminal 3 and the first wall 221 can be improved, the risk of the electrode terminal 3 being separated from the first wall 221 can be reduced, and the reliability of the battery cell 10 can be improved.

[0213] The above configuration facilitates the combination of the electrode terminal 3 and the first wall 221 and helps to improve the combination strength between the electrode terminal 3 and the first wall 221 .

[0214] In some embodiments, please refer to Figure 6 、 Figure 8 and Figure 9 , and in conjunction with other drawings. There are multiple first limiting portions 2211, each of which surrounds the outer circumference of the outlet hole 201 at intervals along the circumferential direction Y of the outlet hole 201. There are multiple second limiting portions 32, each of which has a corresponding concave-convex fit with the multiple first limiting portions 2211.

[0215] It can be understood that there are multiple second limiting parts 32, and the multiple second limiting parts 32 and the multiple first limiting parts 2211 are arranged in a one-to-one correspondence, and the multiple second limiting parts 32 and the multiple first limiting parts 2211 are matched in a one-to-one concave-convex manner.

[0216] Such a setting can improve the stability and reliability of the electrode terminal 3 being limited on the first wall 221 along the circumferential Y direction of the lead-out hole 201, thereby helping to improve the bonding strength between the electrode terminal 3 and the first wall 221, reduce the risk of the electrode terminal 3 escaping from the first wall 221, and reduce the risk of connection failure between the electrode terminal 3 and the motor 300 assembly, thereby improving the reliability of the battery cell 10.

[0217] In some embodiments, there are two electrode terminals 3 , one is a positive electrode terminal and the other is a negative electrode terminal. The number and structure of the second limiting portions 32 of the positive electrode terminal are different from those of the negative electrode terminal.

[0218] It is understandable that in some possible designs, the number of the second limiting portions 32 of the positive electrode terminal is different from the number of the second limiting portions 32 of the negative electrode terminal.

[0219] In some possible designs, the structure of the second limiting portion 32 of the positive electrode terminal is different from the structure of the second limiting portion 32 of the negative electrode terminal. The difference in structure between the second limiting portion 32 of the positive electrode terminal and the second limiting portion 32 of the negative electrode terminal may include, but is not limited to, a difference in shape between the second limiting portion 32 of the positive electrode terminal and the second limiting portion 32 of the negative electrode terminal.

[0220] By adopting the above technical solution, the second limiting portion 32 can achieve an anti-mistake effect on the electrode terminal 3, which can improve the problem of reverse installation of the positive electrode terminal and the negative electrode terminal, and can help reduce the scrap rate of the battery cell 10 and improve the yield rate of the battery cell 10.

[0221] See also Figure 2 , and in conjunction with other drawings. The battery 100 provided in the embodiment of the present application includes a battery cell 10. The battery cell 10 in this embodiment is the same as the battery cell 10 in the above embodiments. For details, please refer to the relevant description of the battery cell 10 in the above embodiments, which will not be repeated here.

[0222] The battery 100 provided in the embodiment of the present application, by employing the battery cell 10 described in the above embodiments, can improve the bonding strength between the electrode terminal 3 and the first wall 221, thereby reducing the risk of the electrode terminal 3 breaking free from the connection between the electrode terminal 3 and the first wall 221, thereby reducing the risk of the electrode terminal 3 detaching from the first wall 221, and reducing the risk of connection failure between the electrode terminal 3 and the motor 300 assembly. Thus, the problem of the electrode terminal 3 detaching from the first wall 221 during the charging, discharging, and testing of the battery cell 10 can be improved, thereby improving the connection between the electrode terminal 3 and the electrode assembly 1, thereby improving the stability and reliability of the battery cell 10, and further improving the stability and reliability of the battery 100.

[0223] See also Figure 1 The power-consuming device provided in the embodiment of the present application includes a battery 100. The battery 100 in this embodiment is the same as the battery 100 in the above embodiments. For details, please refer to the relevant description of the battery 100 in the above embodiments, which will not be repeated here.

[0224] The electrical device provided in the embodiment of the present application, by adopting the battery 100 involved in the above embodiments, can improve the stability and reliability of the battery 100, thereby helping to improve the reliability of the electrical device.

[0225] As one of the embodiments of this application, Figures 3 to 9As shown, the battery cell 10 includes an electrode assembly 1, a housing 2, and an electrode terminal 3. The housing 2 includes a housing 21 and an end cap 22 provided on the housing 21. The electrode assembly 1 is provided in the space enclosed by the housing 21 and the end cap 22. Along the distribution direction of the end cap 22 and the electrode assembly 1, the end cap 22 is formed with an extraction hole 201. Along the distribution direction of the end cap 22 and the electrode assembly 1, the side of the end cap 22 away from the electrode assembly 1 is provided with a mounting groove 202, an avoidance groove 203, and a plurality of first limiting grooves 22111. The mounting groove 202 is provided around the periphery of the extraction hole 201, and the avoidance groove 203 is provided around the periphery of the mounting groove 202. Along the distribution direction of the end cap 22 and the electrode assembly 1, the inner bottom wall of the avoidance groove 203 is located between the inner bottom wall of the mounting groove 202 and the side of the end cap 22 away from the electrode assembly 1, so that a step structure 2212 is formed between the avoidance groove 203 and the mounting groove 202. Along the radial direction X of the lead-out hole 201, a first limiting groove 22111 is provided on the inner sidewall of the mounting groove 202 and extends through the step structure 2212. A plurality of first limiting grooves 22111 are spaced apart along the circumferential direction Y of the lead-out hole 201 and surround the outer circumference of the lead-out hole 201. The electrode terminal 3 includes a main structure 31 and a plurality of first protrusions 321. The main structure 31 includes a conductive member 311, a connector 313, and an insulating member 312. The connector 313 includes a main body 3132 and a connecting portion 3131. The conductive member 311 covers the lead-out hole 201 and is connected to the electrode assembly 1. The main body 3132 is provided around the outer circumference of the conductive member 311. The insulating member 312 is provided around the outer circumference of the conductive member 311 and is connected between the conductive member 311 and the main body 3132 to secure and separate the conductive member 311 and the main body 3132. The connecting portion 3131 is connected to the outer periphery of the main body 3132 and engages with the inner sidewall of the mounting groove 202, ensuring that the main structure 31 is confined within the mounting groove 202 along the radial direction X of the lead-out hole 201. The mating position between the connecting portion 3131 and the inner sidewall of the mounting groove 202 is welded and fixed. A plurality of first protrusions 321 are connected to the connecting portion 3131 at intervals along the circumferential direction Y of the lead-out hole 201. The plurality of first protrusions 321 and the plurality of first limiting grooves 22111 have a one-to-one concave-convex matching relationship, ensuring that the first protrusions 321 are confined within the first limiting grooves 22111 along the circumferential direction Y of the lead-out hole 201, thereby confining the electrode terminal 3 on the first wall 221 along the circumferential direction Y of the lead-out hole 201. Furthermore, the mating position between the first protrusions 321 and the inner sidewall of the first limiting groove 22111 is welded and fixed.

[0226] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A battery cell, characterized in that: include: electrode assembly; A housing in which the electrode assembly is disposed; the housing includes a first wall, wherein the first wall is provided with an outlet hole and a first limiting portion; The electrode terminal includes a main structure connected to the electrode assembly and a second limiting portion provided on the main structure; the main structure is connected to the first wall and covers the lead-out hole; the first limiting portion and the second limiting portion are matched in a concave-convex manner so that the electrode terminal and the first wall form a limit in the circumferential direction of the lead-out hole.

2. The battery cell according to claim 1, wherein: One of the first limiting portion and the second limiting portion includes a limiting groove, and the other includes a convex portion; in the circumferential direction of the lead-out hole, the convex portion is limited in the limiting groove.

3. The battery cell according to claim 2, characterized in that: In the axial direction of the outlet hole, a mounting groove is provided on one side of the first wall; the mounting groove is arranged around the outer periphery of the outlet hole, and the first limiting portion is arranged on the inner wall of the mounting groove; in the radial direction of the outlet hole, the main body structure is limited in the mounting groove.

4. The battery cell according to claim 3, characterized in that In the axial direction of the lead-out hole, the mounting groove is provided on a side of the first wall away from the electrode assembly.

5. The battery cell according to claim 3, characterized in that: The first limiting portion includes the limiting groove; in the radial direction of the lead-out hole, the limiting groove of the first limiting portion is arranged on the inner side wall of the installation groove; in the axial direction of the lead-out hole, the limiting groove of the first limiting portion passes through the side of the first wall having the installation groove.

6. The battery cell according to any one of claims 2 to 5, characterized in that: The second limiting portion includes the limiting groove provided on the main structure; in the axial direction of the lead-out hole, the limiting groove of the second limiting portion passes through the portion of the main structure having the limiting groove.

7. The battery cell according to any one of claims 2 to 5, characterized in that: In the radial direction of the outlet hole, the size of the protrusion ranges from 1 mm to 10 mm; And / or, in the circumferential direction of the lead-out hole, the size of the protrusion ranges from 1 mm to 10 mm.

8. The battery cell according to claim 7, characterized in that In the radial direction of the outlet hole, the size of the protrusion ranges from 3 mm to 5 mm; And / or, in the circumferential direction of the lead-out hole, the size of the protrusion ranges from 3 mm to 5 mm.

9. The battery cell according to any one of claims 2 to 5, characterized in that: In the radial direction of the lead-out hole, the size of the limiting groove is larger than the size of the protrusion, and the difference between the sizes of the limiting groove and the protrusion is 0.02 to 0.1 mm; and / or, in the circumferential direction of the lead-out hole, the size of the limiting groove is larger than the size of the protrusion, and the difference between the sizes of the limiting groove and the protrusion is 0.02 to 0.1 mm.

10. The battery cell according to any one of claims 3 to 5, characterized in that: In the axial direction of the outlet hole, an avoidance groove is provided on the side of the first wall having the mounting groove, and the inner wall of the avoidance groove is located between the side of the first wall having the mounting groove and the inner wall of the mounting groove; the avoidance groove is arranged around the outer periphery of the mounting groove and forms a step structure with the mounting groove.

11. The battery cell according to any one of claims 3 to 5, characterized in that: The main structure includes: a conductive member connected to the electrode assembly and covering the lead-out hole; a connecting member surrounding the outer periphery of the conductive member, being limited in the mounting groove, and connected to the first wall; the second limiting portion is provided on the connecting member; The insulating member fixes and separates the connecting member and the conductive member.

12. The battery cell according to claim 11, characterized in that A connecting portion is provided on the outer circumference of the connecting member, and the connecting portion is limitedly engaged with the radial inner wall of the mounting groove in the outlet hole; the connecting portion is connected to the first wall, and the second limiting portion is provided on the connecting portion; In the axial direction of the outlet hole, the size of the inner side wall of the mounting groove in the radial direction of the outlet hole is greater than or equal to the size of the connecting portion.

13. The battery cell according to claim 12, characterized in that: In the axial direction of the lead-out hole, a difference between a size of an inner side wall of the mounting groove in the radial direction of the lead-out hole and a size of the connecting portion is ≤0.3 mm.

14. The battery cell according to any one of claims 1 to 5, characterized in that: The main structure is passed through the outlet hole, and the first limiting portion is provided on the inner peripheral wall of the outlet hole.

15. The battery cell according to any one of claims 1 to 5, characterized in that: The main structure and the first wall are fixed by welding; and / or the first limiting portion and the second limiting portion are fixed by welding.

16. The battery cell according to any one of claims 1 to 5, characterized in that: There are multiple first limiting parts, and the multiple first limiting parts are spaced around the outer circumference of the lead-out hole along the circumference of the lead-out hole; there are multiple second limiting parts, and the multiple second limiting parts and the multiple first limiting parts are matched with each other in a concave and convex manner.

17. The battery cell according to any one of claims 1 to 5, characterized in that: There are two electrode terminals, which are a positive electrode terminal and a negative electrode terminal respectively; at least one of the number and structure of the second limiting parts of the positive electrode terminal is different from that of the negative electrode terminal.

18. A battery, characterized in that: The invention comprises a battery cell according to any one of claims 1 to 17.

19. An electrical device, characterized in that: Comprising a battery according to claim 18.

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