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 a shell, an electrode assembly and an electrode terminal. The shell is provided with a lead-out hole; the electrode assembly is arranged in the shell; the electrode terminal comprises a terminal body and a first boss, and the terminal body covers the lead-out hole; along the axial direction of the lead-out hole, the first boss is arranged at one end, close to the electrode assembly, of the terminal body; the first boss passes through the lead-out hole and is connected to the electrode assembly. The electrode terminal comprises the first boss arranged in the lead-out hole, so that the electrode terminal can extend into the shell under the condition that the volume of the shell is predetermined, the height of the part, positioned outside the shell, of the electrode terminal can be reduced, the volume of the battery monomer can be reduced, the occupied space of the battery monomer in the box body can be reduced, and the service life of the battery monomer can be prolonged. And the space utilization rate of the box body is improved, so that the energy density of the battery is 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 may include a housing and battery cells disposed within the housing. However, the battery cells are generally large in size, thus occupying a large space within the housing, resulting in low space utilization of the housing, which is not conducive to improving the energy density of the battery. Utility Model Content

[0003] In view of the above problems, the embodiments of the present application provide a battery cell, a battery, and an electrical device, which can improve the energy density of the battery.

[0004] In a first aspect, an embodiment of the present application provides a battery cell, comprising:

[0005] The housing is provided with an outlet hole;

[0006] an electrode assembly disposed in the housing;

[0007] The electrode terminal includes a terminal body and a first boss, wherein the terminal body covers the lead-out hole; along the axial direction of the lead-out hole, the first boss is arranged at one end of the terminal body close to the electrode assembly; the first boss passes through the lead-out hole and is connected to the electrode assembly.

[0008] The battery cell provided in the embodiment of the present application has an electrode terminal including a first boss provided in the lead-out hole, so that when the volume of the shell is predetermined, the electrode terminal can extend into the shell. This can reduce the height of the portion of the electrode terminal located outside the shell to reduce the volume of the battery cell. In this way, the space occupied by the battery cell in the box can be reduced, which helps to improve the space utilization of the box and thus improve the energy density of the battery.

[0009] In some embodiments, the battery cell further includes a transfer member, which includes a main body and a second boss connected to the main body; the main body is disposed in the outer shell and connected to the electrode assembly; the second boss is axially protruding toward the first boss and abuts against the first boss.

[0010] In this way, when the adapter and the electrode terminal are welded, the first boss and the second boss abut against and weld to each other, which can improve the problem of the adapter warping relative to the electrode terminal, resulting in poor welding such as burst points and cold welds between the electrode terminal and the adapter. This can also improve the problem of insufficient welding strength between the adapter and the electrode terminal, resulting in failure of the connection relationship between the electrode terminal and the electrode assembly, thereby improving the reliability of the battery cell.

[0011] In some embodiments, in the axial direction, a groove is provided on a side of the second boss away from the first boss.

[0012] Such a setting can improve the abutment reliability between the second boss and the first boss, thereby improving the connection strength between the adapter and the electrode terminal, and further reducing the problem of failure of the connection relationship between the electrode terminal and the electrode assembly, thereby improving the reliability of the battery cell.

[0013] In some embodiments, the battery cell further includes an insulating member disposed between the electrode assembly and the outer shell; in the axial direction, the insulating member is provided with an avoidance hole, the first boss is passed through the avoidance hole or is disposed opposite to the avoidance hole; the avoidance hole is used for connecting the first boss to the electrode assembly.

[0014] By providing an insulating member between the electrode assembly and the housing, insulation between the housing and the electrode assembly can be achieved. In addition, the avoidance hole on the insulating member allows the first boss to be connected to the electrode assembly.

[0015] In some embodiments, in the axial direction, the avoidance hole is close to one end of the electrode assembly and faces one end of the electrode assembly beyond the first boss and away from the terminal body.

[0016] This arrangement allows the adapter to connect the first boss to the electrode assembly via the adapter, so that the space between the end of the first boss away from the terminal body and the first end can be used to accommodate the second boss of the adapter, allowing the adapter to abut the end of the first boss away from the terminal body via the second boss. This helps to improve the connection strength between the adapter and the electrode terminal, thereby reducing the problem of failure in the connection between the electrode terminal and the electrode assembly, thereby improving the reliability of the battery cell.

[0017] In some embodiments, in the axial direction, a distance between an end of the avoidance hole close to the electrode assembly and an end of the first boss away from the terminal body is a first distance, and 0.5 mm ≤ the first distance ≤ 1.5 mm.

[0018] This allows the boss to be inserted into the lead-out hole, reducing the axial size of the battery cell. Furthermore, the space between the end of the avoidance hole closest to the electrode assembly and the end of the first boss away from the terminal body can be used to accommodate a sufficient amount of the second boss, thereby improving the connection strength between the adapter and the electrode terminal. This, in turn, reduces the risk of connection failure between the electrode terminal and the electrode assembly, thereby improving the reliability of the battery cell.

[0019] In some embodiments, 0.8 mm ≤ the first distance ≤ 1.2 mm.

[0020] This arrangement, on the one hand, allows the boss to be inserted into the lead-out hole, thereby reducing the axial size of the battery cell. On the other hand, the space between the end of the avoidance hole closest to the electrode assembly and the end of the first boss away from the terminal body can be used to accommodate a sufficient amount of the second boss, thereby improving the connection strength between the adapter and the electrode terminal, thereby reducing the risk of failure in the connection between the electrode terminal and the electrode assembly, and thus improving the reliability of the battery cell.

[0021] In some embodiments, the first boss has an axial dimension ranging from 0.3 mm to 1.3 mm.

[0022] This arrangement allows the first boss to have a more appropriate axial dimension. This, on the one hand, can reduce the axial dimension of the portion of the electrode terminal located outside the housing to a certain extent, thereby reducing the axial dimension of the battery cell. On the other hand, it can also improve the connection reliability between the first boss and the electrode assembly.

[0023] In some embodiments, the first boss has an axial dimension ranging from 0.8 mm to 1 mm.

[0024] This arrangement allows the first boss to have a more appropriate axial dimension. This, on the one hand, can reduce the axial dimension of the portion of the electrode terminal located outside the housing to a certain extent, thereby reducing the axial dimension of the battery cell. On the other hand, it can also improve the connection reliability between the first boss and the electrode assembly.

[0025] In some embodiments, the battery cell further includes a sealing ring, which is disposed around the outer circumference of the first boss and axially abuts between the outer shell and the terminal body.

[0026] By adopting the above technical solution, the sealing ring can achieve sealing between the electrode terminal and the shell, thereby improving the reliability of the battery cell.

[0027] In some embodiments, the electrode terminal includes a negative electrode terminal, and the terminal body of the negative electrode terminal includes an outer terminal and a composite part; the material of the composite part is different from the material of the outer terminal and is the same as the material of the first boss; the outer terminal, the composite part and the first boss are distributed in sequence along the axial direction, the composite part covers the lead-out hole, and the sealing ring is axially abutted between the outer shell and the composite part.

[0028] By covering the lead-out hole with the composite portion, and axially abutting the sealing ring between the outer shell and the composite portion, the composite interface between the external terminal and the composite portion and the sealing ring are axially distributed, and the composite interface between the external terminal and the composite portion and the sealing ring are separated by the composite portion. This can alleviate the problem of electrolyte in the outer shell penetrating through the sealing ring to the composite interface between the external terminal and the composite portion, causing damage to the composite interface between the external terminal and the composite portion. This helps to ensure and maintain the bonding strength between the composite portion and the external terminal to a certain extent, thereby improving the structural strength of the electrode terminal and alleviating the problem of the electrode terminal being detached from the outer shell.

[0029] In some embodiments, the axial dimension of the composite portion ranges from 0.1 mm to 0.5 mm.

[0030] This arrangement allows the composite portion to have a more appropriate size in the axial direction. This, on the one hand, can improve the bonding strength between the composite portion and the external terminal, thereby improving the bonding strength between the external terminal and the first boss, which helps to improve the problem of the electrode terminal being detached from the housing.

[0031] In some embodiments, the axial dimension of the composite portion ranges from 0.2 mm to 0.4 mm.

[0032] This arrangement allows the composite portion to have a more appropriate size in the axial direction. This, on the one hand, can improve the bonding strength between the composite portion and the external terminal, thereby improving the bonding strength between the external terminal and the first boss, which helps to improve the problem of the electrode terminal being detached from the housing.

[0033] In some embodiments, the electrode terminal includes a negative electrode terminal, and the terminal body of the negative electrode terminal includes an external terminal and a composite part; the material of the composite part is different from the material of the external terminal and is the same as the material of the first boss; the external terminal, the composite part and the first boss are distributed in sequence along the axial direction, and the composite part covers the lead-out hole; the sum of the axial dimensions of the composite part and the first boss ranges from 1.0 mm to 1.5 mm.

[0034] This arrangement ensures that the combined dimensions of the composite portion and the first boss are relatively suitable in the axial direction. Thus, when the first boss is used for welding, for example, to a tab or adapter of an electrode assembly, the weld mark formed by the first boss will not extend onto the external terminal, thereby improving the reliability of the battery cell.

[0035] In some embodiments, the sum of the axial dimensions of the composite portion and the first boss ranges from 1.2 mm to 1.4 mm.

[0036] This arrangement ensures that the combined dimensions of the composite portion and the first boss are optimally balanced in the axial direction. This prevents weld marks from extending onto the external terminal when the first boss is used for welding, such as welding an electrode assembly tab or adapter, thereby improving the reliability of the battery cell. Furthermore, given a predetermined axial dimension for the electrode terminal, the external terminal can have a more optimal axial dimension, facilitating connection between the external terminal and an external conductive component.

[0037] In some embodiments, the electrode terminal includes a negative electrode terminal, and the terminal body of the negative electrode terminal includes an outer terminal and a composite part; the material of the composite part is different from the material of the outer terminal and is the same as the material of the first boss; the outer terminal, the composite part and the first boss are distributed in sequence along the axial direction, and the composite part covers the lead-out hole; the axial dimension range of the outer terminal is 1.5 mm to 2.5 mm.

[0038] This arrangement provides the outer terminal with a suitable axial dimension. This, on the one hand, provides greater structural strength for the outer terminal, facilitating its assembly with the composite portion. On the other hand, when the outer terminal is welded to an external conductive component, the weld mark remains on the outer terminal and does not extend to the composite portion or the first boss, thereby improving the reliability of the battery cell.

[0039] In some embodiments, the axial dimension of the outer terminal ranges from 1.8 mm to 2.2 mm.

[0040] This arrangement provides the outer terminal with a suitable axial dimension. This, on the one hand, provides greater structural strength for the outer terminal, facilitating its assembly with the composite portion. On the other hand, when the outer terminal is welded to an external conductive component, the weld mark remains on the outer terminal and does not extend to the composite portion or the first boss, thereby improving the reliability of the battery cell.

[0041] In some embodiments, the electrode terminal includes a positive electrode terminal, and the axial dimension of the positive electrode terminal ranges from 2.5 mm to 4 mm.

[0042] This arrangement ensures that the positive electrode terminal has a relatively suitable axial dimension. This, on the one hand, facilitates welding of the positive electrode terminal to external conductive components and adapters with minimal interference. On the other hand, it effectively reduces the axial dimension of the positive electrode terminal, thereby ensuring the energy density of the battery cell to a certain extent.

[0043] In some embodiments, the axial dimension of the positive electrode terminal ranges from 3 mm to 3.5 mm.

[0044] This arrangement ensures that the positive electrode terminal has a relatively suitable axial dimension. This, on the one hand, facilitates welding of the positive electrode terminal to external conductive components and adapters with minimal interference. On the other hand, it effectively reduces the axial dimension of the positive electrode terminal, thereby ensuring the energy density of the battery cell to a certain extent.

[0045] In a second aspect, an embodiment of the present application provides a battery comprising a battery cell.

[0046] The battery provided in the embodiment of the present application, by adopting the battery cells involved above, can reduce the space occupied by the battery cells in the box, help to improve the space utilization of the box, and thus improve the energy density of the battery.

[0047] In a third aspect, an embodiment of the present application provides an electrical device including a battery.

[0048] The electrical device provided in the embodiment of the present application, by adopting the above-mentioned battery, helps to improve the space utilization of the box, thereby increasing the energy density of the battery, and thus improving the reliability of the device.

[0049] 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

[0050] 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.

[0051] Figure 1 A schematic diagram of a vehicle provided for some embodiments of the present application;

[0052] Figure 2 An exploded view of a battery provided for some embodiments of the present application;

[0053] Figure 3 A three-dimensional structural diagram of a battery cell provided in some embodiments of the present application;

[0054] Figure 4 An exploded view of a battery cell provided for some embodiments of the present application;

[0055] Figure 5 for Figure 4 Partial structural diagram;

[0056] Figure 6 for Figure 3 Cross-sectional view along AA;

[0057] Figure 7 for Figure 6 Enlarged view of point B in the middle;

[0058] Figure 8 for Figure 7 Enlarged view of point C in the middle;

[0059] Figure 9 A structural diagram of an electrode terminal of a battery cell provided in some embodiments of the present application;

[0060] Figure 10 for Figure 9 Cross-sectional view along DD;

[0061] Figure 11 for Figure 6 Enlarged view of point E in the middle.

[0062] Among them, the reference numerals in the figures are:

[0063] 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; 21-shell; 22-end cover; 3-electrode terminal; 3a-positive electrode terminal; 3b-negative electrode terminal; 31-terminal body; 311-outer terminal; 312-composite part; 32-first boss; 4-adapter; 401-groove; 41-main body; 42-second boss; 5-insulating part; 501-avoidance hole; 502-first end; 51-insulating body; 52-third boss; 6-sealing ring; 7-upper plastic; 8-fixing part; H1-first distance; L1-first dimension; L2-second dimension; L3-third dimension; L4-fourth dimension; Z-axial direction; X-radial direction. DETAILED DESCRIPTION

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] In the related art, a battery may include a housing and battery cells disposed within the housing. However, the battery cells are generally large in size, thus occupying a large space within the housing, resulting in low space utilization of the housing, which is not conducive to improving the energy density of the battery.

[0072] Specifically, a battery cell includes an electrode assembly, a housing, and electrode terminals. The electrode assembly is disposed in the housing. The electrode terminals are disposed on the housing and connected to the electrode assembly.

[0073] In some cases, the electrode terminals are located outside the outer casing and have a relatively large height, which makes the battery cells taller. Thus, when the volume of the outer casing is predetermined, the battery cells have a relatively large volume, which will occupy a large space inside the casing, resulting in low space utilization of the casing.

[0074] Based on the above considerations, an embodiment of the present application provides a battery cell, a battery and an electrical device, in which the electrode terminal includes a first boss provided in the lead-out hole, so that when the volume of the outer shell is predetermined, the electrode terminal can extend into the outer shell. This can reduce the height of the portion of the electrode terminal located outside the outer shell to reduce the volume of the battery cell, thereby reducing the space occupied by the battery cell in the box body, helping to improve the space utilization of the box body and thereby improve the energy density of the battery.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] As an example, a plurality of battery cells may be fixed by cable ties or the like to form a battery module.

[0082] As an example, multiple battery cells may be fixed together by end plates, side plates, etc. to form a battery module.

[0083] 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.

[0084] For ease of description, the embodiments of the present application are described using a vehicle as an example of an electrical device.

[0085] 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.

[0086] 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 .

[0087] In some embodiments, see Figure 2 , Figure 2This 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.

[0088] 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 2 The 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] In the battery cell 10 , the number of electrode assemblies 1 may be one or more.

[0094] In some cases, the electrode assembly 1 may also be referred to as a bare cell, a wound body, a laminated body, etc.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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 .

[0099] 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.

[0100] 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 the current transmission end of the battery cell 10 for transmitting current.

[0101] 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 4 As shown, an adapter 4 can also be provided between the electrode terminal 3 and the tab. The adapter 4 is connected to the electrode terminal 3 and the tab to achieve the connection between the electrode terminal 3 and the tab so as to enable current to flow, thereby indirectly achieving the connection between the electrode terminal 3 and the tab.

[0102] The adapter 4 refers to a metal structure with conductive properties, such as but not limited to a copper busbar.

[0103] In some embodiments, see Figure 4 There are two electrode terminals 3, namely a positive electrode terminal 3a and a negative electrode terminal 3b. The positive electrode terminal 3a is conductively connected to the positive electrode tab of the electrode assembly 1, and the negative electrode terminal 3b is conductively connected to the negative electrode tab of the electrode assembly 1.

[0104] 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 3a and the negative electrode terminal 3b can be provided on the shell 21 at the same time; or Figure 4 As shown, the positive electrode terminal 3a and the negative electrode terminal 3b are both provided on the end cover 22; or, one of the positive electrode terminal 3a and the negative electrode terminal 3b is provided on the shell 21, and the other is provided on the end cover 22.

[0105] Among them, Figure 4 As shown, the positive electrode terminal 3a and the negative electrode terminal 3b can be provided at the same end of the housing 2. Alternatively, the positive electrode terminal 3a and the negative electrode terminal 3b can also be provided at opposite ends of the housing 2.

[0106] The electrode terminal 3 can be made of a metal material, including, but not limited to, a post. As an example, the positive electrode terminal 3a is an aluminum post, and the negative electrode terminal 3b is a composite post made of aluminum and copper. The copper material of the negative electrode terminal 3b is used for connection to the tab.

[0107] Please also refer to Figures 4 to 10 , and combined with other drawings. Among them, Figure 5 for Figure 4 Partial structural diagram, Figure 6 for Figure 3 Section view along AA, Figure 7 for Figure 6 The enlarged view of point B in the middle. Figure 8 for Figure 7 The enlarged image of point C in the middle, Figure 9 This is a structural diagram of the electrode terminal 3 of the battery cell 10 provided in some embodiments of the present application. Figure 10 for Figure 9 Cross-sectional view along DD. Figures 7 to 10 The electrode terminals 3 shown in the figure are all negative electrode terminals 3b. The battery cell 10 provided in the embodiment of the present application includes a shell 2, an electrode assembly 1 and an electrode terminal 3. The shell 2 is provided with a lead-out hole 201. The electrode assembly 1 is arranged in the shell 2. The electrode terminal 3 includes a terminal body 31 and a first boss 32, and the terminal body 31 covers the lead-out hole 201. Along the axial direction Z of the lead-out hole 201, the first boss 32 is provided at one end of the terminal body 31 close to the electrode assembly 1. The first boss 32 is passed through the lead-out hole 201 and is connected to the electrode assembly 1.

[0108] The lead-out hole 201 is a through hole penetrating the wall of the housing 2, and is used to connect the electrode terminal 3 to the electrode assembly 1 through the lead-out hole 201. The penetrating direction of the lead-out hole 201 on the housing 2 is the axial direction Z of the lead-out hole 201.

[0109] Hereinafter, unless otherwise specified, the axial direction Z refers to the axial direction Z of the lead-out hole 201 . In some cases, the axial direction Z of the lead-out hole 201 may be the height direction of the battery cell 10 , that is, the height direction of the electrode terminal 3 .

[0110] The terminal body 31 and the first boss 32 are two parts of the electrode terminal 3, both of which are conductive. The electrode terminal 3 may include a positive electrode terminal 3a and a negative electrode terminal 3b. For example, in the positive electrode terminal 3a, the terminal body 31 and the first boss 32 may both be made of aluminum. For example, in the negative electrode terminal 3b, the terminal body 31 may be made of aluminum, and the first boss 32 may be made of copper.

[0111] The terminal body 31 covers the lead-out hole 201, and the first boss 32 is provided at the end of the terminal body 31 that is closer to the electrode assembly 1 along the axial direction Z and extends through the lead-out hole 201, so that the terminal body 31 is provided at the end of the housing 2 that is farther away from the electrode assembly 1 along the axial direction Z. In other words, at least a portion of the terminal body 31 is located outside the housing 2. It can be understood that the terminal body 31 is the portion of the electrode terminal 3 that is located outside the housing 2 and is used to connect to external conductive components.

[0112] The first boss 32 is disposed in the lead-out hole 201, which means that at least a portion of the first boss 32 is located in the lead-out hole 201, so that the first boss 32 can be connected to the electrode assembly 1 through the lead-out hole 201. It can be understood that the first boss 32 is the portion of the electrode terminal 3 located in the housing 2.

[0113] The first boss 32 is connected to the electrode assembly 1 to achieve electrical conduction between the electrode terminal 3 and the electrode assembly 1. The first boss 32 can be directly connected to the electrode assembly 1, for example, but not limited to, by welding to the electrode assembly 1. The first boss 32 can also be connected to the electrode assembly 1 via an adapter 4. Specifically, the adapter 4 is connected to the first boss 32 and the electrode assembly 1 to achieve electrical conduction between the electrode assembly 1 and the first boss 32. For example, the first boss 32 and the adapter 4 are welded.

[0114] It should be noted that the radial dimension of the first boss 32 is smaller than the radial dimension of the terminal body 31, so that the terminal body 31 can cover the lead-out hole 201, and the first boss 32 can pass through the lead-out hole 201. The radial dimension refers to the dimension in the radial direction X.

[0115] The inner circumferential wall of the outlet hole 201 may be substantially extended in the circumferential direction to substantially define a circle, and the radius of the circle substantially defined by the inner circumferential wall of the outlet hole 201 is the radial direction X of the outlet hole 201. In the various embodiments of the present application, unless otherwise specified, the radial direction X refers to the radial direction X of the outlet hole 201.

[0116] It should be noted that the terminal body 31 is insulated and connected to the housing 2, and is thus provided on the housing 2. Specifically, an insulating structure may be provided between the terminal body 31 and the housing 2, so that the terminal body 31 and the housing 2 are insulated and connected via the insulating structure. The insulating structure may be, but is not limited to, the upper plastic 7 described below.

[0117] The battery cell 10 provided in the embodiment of the present application includes a first boss 32 provided in the lead-out hole 201 through the electrode terminal 3, so that when the volume of the outer shell 2 is predetermined, the electrode terminal 3 can extend into the outer shell 2. This can reduce the height of the portion of the electrode terminal 3 located outside the outer shell 2 to reduce the volume of the battery cell 10. In this way, the space occupied by the battery cell 10 in the box body 20 can be reduced, which helps to improve the space utilization of the box body 20 and thereby improve the energy density of the battery 100.

[0118] In addition, the first boss 32 of the electrode terminal 3 is passed through the lead-out hole 201, which can reduce the height of the portion of the electrode terminal 3 located outside the outer shell 2. In this way, when the volume of the outer shell 2 and the electrode assembly 1 is predetermined, the volume of the battery cell 10 can be reduced, thereby helping to improve the energy density of the battery cell 10.

[0119] In some embodiments, please refer to Figures 7 to 10 , and in conjunction with other figures. The battery cell 10 also includes an adapter 4, which includes a main body 41 and a second boss 42 connected to the main body 41. The main body 41 is disposed within the housing 2 and connected to the electrode assembly 1. The second boss 42 protrudes toward the first boss 32 along the axial direction Z and abuts against the first boss 32.

[0120] The adapter 4 is a component used to connect the first boss 32 and the electrode assembly 1 to achieve electrical conduction between the electrode terminal 3 and the electrode assembly 1. The adapter 4 can be, but is not limited to, a copper busbar or a bar.

[0121] The main body 41 and the second boss 42 are two parts of the adapter 4. The main body 41 is connected to the electrode assembly 1 to achieve the connection between the adapter 4 and the electrode assembly 1.

[0122] The second boss 42 is provided to protrude toward the first boss 32 along the axial direction Z, which means that in the axial direction Z, the second boss 42 protrudes from the main body 41 toward the first boss 32 .

[0123] The second boss 42 abuts against the first boss 32, which means that the second boss 42 abuts against the first boss 32 and is connected to the first boss 32 to achieve the connection between the first boss 32 and the adapter 4. The second boss 42 can be, but is not limited to, welded to the first boss 32.

[0124] The second boss 42 of the adapter 4 protrudes toward the first boss 32 along the axial direction Z and abuts against the first boss 32, so that the second boss 42 can be stably and securely connected to the first boss 32. In this way, when the adapter 4 and the electrode terminal 3 are welded, the first boss 32 and the second boss 42 abut against each other and welded, which can improve the problem of the adapter 4 warping relative to the electrode terminal 3, resulting in poor welding such as cracking points and cold welding between the electrode terminal 3 and the adapter 4. This can also improve the problem of insufficient welding strength between the adapter 4 and the electrode terminal 3, which leads to failure of the connection between the electrode terminal 3 and the electrode assembly 1, thereby improving the reliability of the battery cell 10.

[0125] In some embodiments, please refer to Figure 7 and Figure 8 In the axial direction Z, a groove 401 is provided on a side of the second boss 42 away from the first boss 32 .

[0126] The second boss 42 and the groove 401 of the adapter 4 can be formed by, but not limited to, stamping. Specifically, the adapter 4 can be stamped on the side away from the first boss 32 along the axial direction Z, so that the side of the adapter 4 away from the first boss 32 along the axial direction Z is recessed to form the groove 401, and the side of the adapter 4 closer to the first boss 32 along the axial direction Z is protruded to form the second boss 42.

[0127] The provision of the groove 401 allows the second boss 42 to undergo a certain degree of elastic deformation relative to the main body 41. Thus, under the action of the main body 41, the second boss 42 can elastically abut against and connect to the first boss 32. This arrangement improves the abutment between the second boss 42 and the first boss 32, thereby increasing the connection strength between the adapter 4 and the electrode terminal 3. This, in turn, reduces the risk of failure in the connection between the electrode terminal 3 and the electrode assembly 1, thereby enhancing the reliability of the battery cell 10.

[0128] In some embodiments, please refer to Figure 4 、 Figure 5 、 Figures 7 to 10 , and in conjunction with other figures. The battery cell 10 also includes an insulating member 5, which is disposed between the electrode assembly 1 and the housing 2. In the axial direction Z, the insulating member 5 is provided with a relief hole 501. In the axial direction Z, the first boss 32 is disposed within or opposite the relief hole 501. The relief hole 501 is used to connect the first boss 32 to the electrode assembly 1.

[0129] The insulating member 5 is a component with insulating properties, and is mainly provided between the housing 2 and the electrode assembly 1 to achieve an insulating effect between the housing 2 and the electrode assembly 1. The insulating member 5 may be a lower plastic.

[0130] The avoidance hole 501 refers to a through hole formed by the insulating member 5 along the axial direction Z. The avoidance hole 501 is used for connecting the first boss 32 to the electrode assembly 1 .

[0131] Among some possible designs, such as Figure 7 and Figure 8 As shown, a portion of the insulating member 5 is located within the outlet hole 201, so that at least a portion of the avoidance hole 501 is located within the outlet hole 201 and is connected to the outlet hole 201. Alternatively, in some other possible designs, the outlet hole 201 and the avoidance hole 501 are sequentially distributed along the axial direction Z and are connected.

[0132] Among some possible designs, such as Figure 7 and Figure 8As shown, the first boss 32 is disposed in the avoidance hole 501, that is, at least a portion of the first boss 32 is located in the avoidance hole 501. Alternatively, in other possible designs, the first boss 32 and the avoidance hole 501 are disposed opposite to each other along the axial direction Z.

[0133] By disposing the insulating member 5 between the electrode assembly 1 and the housing 2 , insulation between the housing 2 and the electrode assembly 1 can be achieved. Furthermore, the avoidance hole 501 on the insulating member 5 allows the first boss 32 to be connected to the electrode assembly 1 .

[0134] In some embodiments, please refer to Figure 7 and Figure 8 In the axial direction Z, the end of the avoidance hole 501 close to the electrode assembly 1 faces the end of the electrode assembly 1 beyond the first boss 32 away from the terminal body 31 .

[0135] For ease of description, an end of the avoidance hole 501 close to the electrode assembly 1 along the axial direction Z is defined as the first end 502 .

[0136] It can be understood that in the axial direction Z, the first end 502 extends beyond the end of the first boss 32 away from the terminal body 31 toward the electrode assembly 1, so that in the axial direction Z, there is a certain distance between the end of the first boss 32 away from the terminal body 31 and the first end 502, which is the first distance H1 involved below.

[0137] This arrangement allows, when the first boss 32 and the electrode assembly 1 are connected via the adapter 4, the space between the end of the first boss 32 away from the terminal body 31 and the first end 502 can be used to accommodate the second boss 42 of the adapter 4, so that the adapter 4 can abut the end of the first boss 32 away from the terminal body 31 via the second boss 42. This helps to improve the connection strength between the adapter 4 and the electrode terminal 3, thereby reducing the problem of failure in the connection between the electrode terminal 3 and the electrode assembly 1, thereby improving the reliability of the battery cell 10.

[0138] It should be noted that the insulating member 5 may include an insulating body 51 and a third boss 52. The insulating body 51 is disposed between the housing 2 and the electrode assembly 1 to provide insulation between the housing 2 and the electrode assembly 1. In the axial direction Z, the third boss 52 is disposed at one end of the insulating body 51 that is close to the electrode assembly 1 and is used to press against the electrode assembly 1, thereby improving the installation reliability of the electrode assembly 1 within the housing 2.

[0139] In the axial direction Z, the end of the avoidance hole 501 close to the electrode assembly 1 faces the end of the electrode assembly 1 that extends beyond the first boss 32 and away from the terminal body 31, which means that in the axial direction Z, the side of the insulating body 51 close to the electrode assembly 1 faces the end of the electrode assembly 1 that extends beyond the first boss 32 and away from the terminal body 31. That is, the first end 502 is provided on the side of the insulating body 51 close to the electrode assembly 1 along the axial direction Z.

[0140] In some embodiments, please refer to Figure 7 and Figure 8 In the axial direction Z, the distance between the end of the avoidance hole 501 close to the electrode assembly 1 and the end of the first boss 32 away from the terminal body 31 is a first distance H1, 0.5mm≤first distance H1≤1.5mm.

[0141] The range of the first distance H1 is [0.5 mm, 1.5 mm], and specifically can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, etc.

[0142] It can be understood that the first distance H1 refers to the distance in the axial direction Z between a side of the insulating body 51 close to the electrode assembly 1 and an end of the first boss 32 close to the electrode assembly 1 .

[0143] This arrangement ensures a relatively suitable distance between the end of the avoidance hole 501 close to the electrode assembly 1 and the end of the first boss 32 away from the terminal body 31. On the one hand, this allows the boss to be inserted into the lead-out hole 201, thereby reducing the size of the battery cell 10 in the axial direction Z. On the other hand, the space between the end of the avoidance hole 501 close to the electrode assembly 1 and the end of the first boss 32 away from the terminal body 31 can be used to accommodate sufficient second bosses 42, thereby improving the connection strength between the adapter 4 and the electrode terminal 3, thereby reducing the problem of failure of the connection between the electrode terminal 3 and the electrode assembly 1, and thus improving the reliability of the battery cell 10.

[0144] In some embodiments, please refer to Figure 7 and Figure 8 , and in combination with other drawings, 0.8 mm ≤ first distance H1 ≤ 1.2 mm.

[0145] The range of the first distance H1 is [0.8 mm, 1.2 mm], and specifically can be 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, 1.0 mm, 1.05 mm, 1.1 mm, 1.15 mm, 1.2 mm, etc.

[0146] This arrangement, on the one hand, allows the boss to be inserted into the lead-out hole 201, thereby reducing the size of the battery cell 10 in the axial direction Z. On the other hand, the space between the end of the avoidance hole 501 close to the electrode assembly 1 and the end of the first boss 32 away from the terminal body 31 can be used to accommodate sufficient second bosses 42, thereby improving the connection strength between the adapter 4 and the electrode terminal 3, thereby reducing the problem of failure of the connection between the electrode terminal 3 and the electrode assembly 1, thereby improving the reliability of the battery cell 10.

[0147] In some embodiments, please refer to Figures 7 to 10 , and in combination with other drawings, the size range of the first boss 32 in the axial direction Z is 0.3 mm to 1.3 mm.

[0148] For ease of description, the axial dimension of the first boss 32 is set to the first dimension L1, and the range of the first dimension L1 is [0.3mm, 1.3mm], which can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, etc.

[0149] This arrangement allows the first boss 32 to have a relatively suitable axial dimension. This, on the one hand, can reduce the axial dimension of the portion of the electrode terminal 3 located outside the housing 2 to a certain extent, thereby reducing the axial dimension of the battery cell 10. On the other hand, it can also improve the connection reliability between the first boss 32 and the electrode assembly 1.

[0150] In some embodiments, please refer to Figures 7 to 10 , and in combination with other drawings, the size range of the first boss 32 in the axial direction Z is 0.8 mm to 1 mm.

[0151] It can be understood that the range of the first dimension L1 is [0.8mm, 1mm], and specifically can be 0.8mm, 0.82mm, 0.85mm, 0.87mm, 0.9mm, 0.83mm, 0.95mm, 0.97mm, 1.0mm, etc.

[0152] This arrangement allows the first boss 32 to have a relatively suitable axial dimension. This, on the one hand, can reduce the axial dimension of the portion of the electrode terminal 3 located outside the housing 2 to a certain extent, thereby reducing the axial dimension of the battery cell 10. On the other hand, it can also improve the connection reliability between the first boss 32 and the electrode assembly 1.

[0153] In some embodiments, please refer to Figure 7 and Figure 8The battery cell 10 further includes a sealing ring 6 , which is disposed around the outer periphery of the first boss 32 and abuts between the housing 2 and the terminal body 31 along the axial direction Z.

[0154] The sealing ring 6 refers to a component with sealing performance, which can be but is not limited to a rubber ring or a silicone ring.

[0155] By adopting the above technical solution, the sealing ring 6 can achieve sealing between the electrode terminal 3 and the housing 2, thereby improving the reliability of the battery cell 10.

[0156] In some embodiments, as Figure 7 and Figure 8 As shown, the sealing ring 6 is disposed around the outer periphery of the first boss 32 and partially seals between the outer periphery of the first boss 32 and the inner peripheral wall of the outlet hole 201 .

[0157] Such an arrangement enables the sealing ring 6 to isolate the first boss 32 from the inner peripheral wall of the lead-out hole 201 , thereby achieving isolation between the electrode terminal 3 and the outer shell 2 .

[0158] In addition, the sealing ring 6 is disposed around the outer periphery of the first boss 32. The end of the first boss 32 that is away from the terminal body 31 in the axial direction Z is used to connect to the electrode assembly 1. When the end of the first boss 32 that is away from the terminal body 31 in the axial direction Z is used for welding, the provision of the first boss 32 can extend the distance between the end of the first boss 32 that is away from the terminal body 31 in the axial direction Z and the sealing ring 6. This can improve the problem of heat generated during welding of the first boss 32 being quickly transferred to the sealing ring 6, which may cause the sealing ring 6 to burn. Specifically, when the end of the first boss 32 that is away from the terminal body 31 in the axial direction Z is welded, it can be used to weld the adapter 4 or directly weld the tab of the electrode assembly 1.

[0159] In some embodiments, please refer to Figures 7 to 10 , and in conjunction with other figures. The electrode terminal 3 includes a negative electrode terminal 3b. The terminal body 31 of the negative electrode terminal 3b includes an external terminal 311 and a composite portion 312. The composite portion 312 is made of a different material than the external terminal 311 and the same material as the first boss 32. The external terminal 311, composite portion 312, and first boss 32 are arranged in sequence along the axial direction Z, with the composite portion 312 covering the lead-out hole 201.

[0160] The outer terminal 311 and the composite portion 312 are two parts of the terminal body 31 . The composite portion 312 is used to connect with the outer terminal 311 , so that the outer terminal 311 , the composite portion 312 and the first boss 32 constitute a composite pole.

[0161] The composite portion 312 is made of a different material than the outer terminal 311, and the composite portion 312 is made of the same material as the first boss 32. For example, the outer terminal 311 is made of aluminum, and the composite portion 312 and the first boss 32 are both made of copper.

[0162] like Figures 7 to 10 As shown, the composite portion 312 is connected to one end of the external terminal 311 close to the electrode assembly 1 along the axial direction Z, and the first boss 32 is provided at one end of the composite portion 312 close to the electrode assembly 1 along the axial direction Z. The external terminal 311 and the composite portion 312 can be composited by welding, cold pressing, or the like, and the composite portion 312 and the first boss 32 can be connected by welding, integral molding, or the like.

[0163] The external terminal 311 is used to connect to an external conductive component, which may be in the form of but not limited to welding.

[0164] The radial dimension of the composite portion 312 is greater than the radial dimension of the first boss 32 , so that the composite portion 312 can cover the lead-out hole 201 , while the first boss 32 is disposed in the lead-out hole 201 .

[0165] In some embodiments, please refer to Figures 7 to 10 , and in conjunction with other drawings, the sealing ring 6 abuts between the housing 2 and the composite portion 312 along the axial direction Z.

[0166] With the composite portion 312 covering the lead-out hole 201, the sealing ring 6 abuts between the outer shell 2 and the composite portion 312 along the axial direction Z, so that the composite interface between the external terminal 311 and the composite portion 312 and the sealing ring 6 are distributed along the axial direction Z, and the composite interface between the external terminal 311 and the composite portion 312 is separated from the sealing ring 6 by the composite portion 312. In this way, the problem of electrolyte in the outer shell 2 penetrating from the sealing ring 6 to the composite interface between the external terminal 311 and the composite portion 312, which would cause the composite interface between the external terminal 311 and the composite portion 312 to be destroyed, can be improved, thereby helping to ensure and maintain the bonding strength between the composite portion 312 and the external terminal 311 to a certain extent, thereby improving the structural strength of the electrode terminal 3 and improving the problem of the electrode terminal 3 being detached from the outer shell 2.

[0167] Moreover, by making the radial dimension of the composite portion 312 larger than the radial dimension of the first boss 32 , the bonding strength between the composite portion 312 and the external terminal 311 can be improved, thereby improving the bonding strength between the external terminal 311 and the first boss 32 , and also helping to improve the problem of the electrode terminal 3 falling off from the outer shell 2 .

[0168] In some embodiments, please refer to Figures 7 to 10 , and in combination with other drawings, the axial dimension of the composite portion 312 ranges from 0.1 mm to 0.5 mm.

[0169] For ease of description, the axial dimension of the composite portion 312 is set as the second dimension L2.

[0170] Among them, the range of the second size L2 is [0.1mm, 0.5mm], and specifically can be 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, etc.

[0171] This configuration allows the composite portion 312 to have a relatively suitable size in the axial direction Z. This, on the one hand, can improve the bonding strength between the composite portion 312 and the external terminal 311 , thereby improving the bonding strength between the external terminal 311 and the first boss 32 , thereby helping to alleviate the problem of the electrode terminal 3 being detached from the housing 2 .

[0172] In some embodiments, please refer to Figures 7 to 10 , and in combination with other drawings, the axial dimension of the composite portion 312 ranges from 0.2 mm to 0.4 mm.

[0173] It can be understood that the range of the second size L2 is [0.2mm, 0.4mm], and specifically can be 0.2mm, 0.22mm, 0.25mm, 0.28mm, 0.3mm, 0.33mm, 0.35mm, 0.37mm, 0.4mm, etc.

[0174] This configuration allows the composite portion 312 to have a relatively suitable size in the axial direction Z. This, on the one hand, can improve the bonding strength between the composite portion 312 and the external terminal 311 , thereby improving the bonding strength between the external terminal 311 and the first boss 32 , thereby helping to alleviate the problem of the electrode terminal 3 being detached from the housing 2 .

[0175] In some embodiments, please refer to Figures 7 to 10 , and in combination with other drawings. The electrode terminal 3 includes a negative electrode terminal 3b, and the terminal body 31 of the negative electrode terminal 3b includes an external terminal 311 and a composite portion 312. The material of the composite portion 312 is different from the material of the external terminal 311, and is the same as the material of the first boss 32. The external terminal 311, the composite portion 312 and the first boss 32 are distributed in sequence along the axial direction Z, and the composite portion 312 covers the lead-out hole 201. The sum of the axial dimensions of the composite portion 312 and the first boss 32 ranges from 1.0 mm to 1.5 mm.

[0176] It can be understood that the sum of the first size L1 and the second size L2 is in the range of [1.0mm, 1.5mm], and can specifically be 1.0mm, 1.05mm, 1.1mm, 1.15mm, 1.2mm, 1.25mm, 1.3mm, 1.35mm, 1.4mm, 1.45mm, 1.5mm, etc.

[0177] This arrangement ensures that the combined dimensions of the composite portion 312 and the first boss 32 are relatively suitable in the axial direction Z. Thus, when the first boss 32 is used for welding, for example, to the tab or adapter 4 of the electrode assembly 1, the weld mark formed by the first boss 32 does not extend onto the external terminal 311, thereby improving the reliability of the battery cell 10. When the first boss 32 is welded to the tab or adapter 4, the weld mark formed can be located on the first boss 32 or on both the first boss 32 and the composite portion 312.

[0178] In some embodiments, please refer to Figures 7 to 10 , and in combination with other drawings, the sum of the axial dimensions of the composite portion 312 and the first boss 32 ranges from 1.2 mm to 1.4 mm.

[0179] It can be understood that the sum of the first dimension L1 and the second dimension L2 is in the range of [1.2mm, 1.4mm], and can specifically be 1.2mm, 1.22mm, 1.25mm, 1.28mm, 1.3mm, 1.33mm, 1.35mm, 1.37mm, 1.4mm, etc.

[0180] This arrangement ensures that the combined dimensions of the composite portion 312 and the first boss 32 have a relatively suitable sum in the axial direction Z. This ensures that, when the first boss 32 is used for welding, for example, to the tab or adapter 4 of the electrode assembly 1, the weld mark formed by the first boss 32 does not extend onto the external terminal 311, thereby improving the reliability of the battery cell 10. Furthermore, given the predetermined axial dimensions of the electrode terminal 3, the external terminal 311 can have a relatively suitable axial dimension, facilitating connection between the external terminal 311 and external conductive components.

[0181] In some embodiments, please refer to Figures 7 to 10 , and in conjunction with other drawings. The electrode terminal 3 includes a negative electrode terminal 3b. The terminal body 31 of the negative electrode terminal 3b includes an external terminal 311 and a composite portion 312. The material of the composite portion 312 is different from that of the external terminal 311 and is the same as that of the first boss 32. The external terminal 311, the composite portion 312, and the first boss 32 are distributed in sequence along the axial direction Z, and the composite portion 312 covers the lead-out hole 201. The axial dimension of the external terminal 311 ranges from 1.5 mm to 2.5 mm.

[0182] For ease of description, the axial dimension of the outer terminal 311 is set to the third dimension L3, and the range of the third dimension L3 is [1.5mm, 2.5mm], which can be 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9m, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, etc.

[0183] This arrangement gives the outer terminal 311 a relatively suitable axial dimension. This, on the one hand, provides greater structural strength for the outer terminal 311, facilitating its assembly with the composite portion 312. On the other hand, when the outer terminal 311 is welded to an external conductive component, the weld mark remains on the outer terminal 311 and does not extend to the composite portion 312 or the first boss 32, thereby improving the reliability of the battery cell 10.

[0184] In some embodiments, please refer to Figures 7 to 10 , and in combination with other drawings, the axial dimension of the outer terminal 311 ranges from 1.8 mm to 2.2 mm.

[0185] It can be understood that the range of the third dimension L3 is [1.8mm, 2.2mm], and specifically can be 1.8mm, 1.85mm, 1.9m, 1.95mm, 2.0mm, 2.05m, 2.1mm, 2.15mm, 2.2mm, etc.

[0186] This arrangement gives the outer terminal 311 a relatively suitable axial dimension. This, on the one hand, provides greater structural strength for the outer terminal 311, facilitating its assembly with the composite portion 312. On the other hand, when the outer terminal 311 is welded to an external conductive component, the weld mark remains on the outer terminal 311 and does not extend to the composite portion 312 or the first boss 32, thereby improving the reliability of the battery cell 10.

[0187] In some embodiments, please refer to Figures 4 to 6 、 Figure 11 , and combined with other drawings. Among them, Figure 11 for Figure 6 The electrode terminal 3 includes a positive electrode terminal 3a, and the axial dimension of the positive electrode terminal 3a ranges from 2.5 mm to 4 mm.

[0188] For convenience of description, the axial dimension of the positive electrode terminal 3 a is set as a fourth dimension L4 .

[0189] Among them, the range of the fourth size L4 is [2.5mm, 4mm], which can be 2.5mm, 2.6m, 2.7mm, 2.8mm, 2.9m, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, etc.

[0190] This arrangement ensures that the positive electrode terminal 3a has a relatively suitable size in the axial direction Z. This, on the one hand, facilitates welding of the positive electrode terminal 3a to the external conductive component and the adapter 4, minimizing interference. On the other hand, it effectively reduces the axial dimension of the positive electrode terminal 3a, thereby ensuring the energy density of the battery cell 10 to a certain extent.

[0191] In some embodiments, see Figure 11 , and in conjunction with other drawings. The axial dimension of the positive electrode terminal 3a ranges from 3 mm to 3.5 mm.

[0192] It can be understood that the range of the fourth dimension L4 is [3mm, 3.5mm], and specifically can be 3mm, 3.1mm, 3.15mm, 3.2mm, 3.25mm, 3.3mm, 3.35mm, 3.4mm, 3.45mm, 3.5mm, etc.

[0193] This arrangement ensures that the positive electrode terminal 3a has a relatively suitable size in the axial direction Z. This, on the one hand, facilitates welding of the positive electrode terminal 3a to the external conductive component and the adapter 4, minimizing interference. On the other hand, it effectively reduces the axial dimension of the positive electrode terminal 3a, thereby ensuring the energy density of the battery cell 10 to a certain extent.

[0194] In some embodiments, see Figure 7 , and in conjunction with other figures. The battery cell 10 may further include an upper plastic 7 and a fixing member 8. The upper plastic 7 is sleeved around the outer periphery of the terminal body 31, and the fixing member 8 is sleeved around the outer periphery of the terminal body 31. The upper plastic 7 is connected between the terminal body 31 and the fixing member 8 to isolate the fixing member 8 from the terminal body 31. The fixing member 8 is fixed to the outer casing 2 to mount the electrode terminal 3 on the outer casing 2.

[0195] The fixing member 8 may be a metal member, and is specifically fixed to the housing 2 by welding.

[0196] 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.

[0197] The battery 100 provided in the embodiment of the present application, by adopting the battery cells 10 involved in the above embodiments, can reduce the space occupied by the battery cells 10 in the box 20, help improve the space utilization of the box 20, and thus improve the energy density of the battery 100.

[0198] 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.

[0199] The electrical device provided in the embodiment of the present application, by adopting the battery 100 involved in the above embodiments, helps to improve the space utilization of the box 20, thereby increasing the energy density of the battery 100, and thus improving the reliability of the device.

[0200] As one of the embodiments of this application, Figures 3 to 11 As shown, the battery cell 10 includes a shell 2, an electrode assembly 1, an electrode terminal 3, an insulating member 5 and an adapter 4. The shell 2 is provided with a lead-out hole 201, and the electrode assembly 1 is provided in the shell 2. The electrode terminal 3 includes a terminal body 31 and a first boss 32, and the terminal body 31 covers the lead-out hole 201. The first boss 32 is provided at one end of the terminal body 31 close to the electrode assembly 1 along the axial direction Z, and is passed through the lead-out hole 201. The insulating member 5 is provided between the shell 2 and the electrode assembly 1, and is provided with an avoidance hole 501, and the avoidance hole 501 is connected to the lead-out hole 201. In the axial direction Z, the avoidance hole 501 is close to the electrode assembly 1 and extends toward the electrode assembly 1 beyond the end of the first boss 32 away from the terminal body 31. The adapter 4 includes an adapter body and a second boss 42, and the adapter body is connected to the electrode assembly 1. In the axial direction Z, the second boss 42 is protruding toward the first boss 32 and abuts against the first boss 32. In the axial direction Z, a groove 401 is provided on a side of the second boss 42 close to the electrode assembly 1 .

[0201] 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: The housing is provided with an outlet hole; an electrode assembly, disposed in the housing; The electrode terminal includes a terminal body and a first boss, wherein the terminal body covers the lead-out hole; along the axial direction of the lead-out hole, the first boss is arranged at one end of the terminal body close to the electrode assembly; the first boss is passed through the lead-out hole and connected to the electrode assembly.

2. The battery cell according to claim 1, wherein: The battery cell also includes a conversion piece, which includes a main body and a second boss connected to the main body; the main body is arranged in the shell and connected to the electrode assembly; the second boss protrudes along the axial direction toward the first boss and abuts against the first boss.

3. The battery cell according to claim 2, characterized in that: In the axial direction, a groove is provided on a side of the second boss away from the first boss.

4. The battery cell according to any one of claims 1 to 3, characterized in that: The battery cell also includes an insulating member, which is arranged between the electrode assembly and the shell; in the axial direction, the insulating member is provided with a avoidance hole, and the first boss is passed through the avoidance hole or is arranged opposite to the avoidance hole; the avoidance hole is used for the first boss to be connected to the electrode assembly.

5. The battery cell according to claim 4, characterized in that In the axial direction, one end of the avoidance hole close to the electrode assembly faces one end of the electrode assembly beyond the first boss and away from the terminal body.

6. The battery cell according to claim 5, characterized in that In the axial direction, a distance between an end of the avoidance hole close to the electrode assembly and an end of the first boss away from the terminal body is a first distance, and 0.5 mm ≤ the first distance ≤ 1.5 mm.

7. The battery cell according to claim 6, characterized in that 0.8mm≤the first distance≤1.2mm.

8. The battery cell according to any one of claims 1 to 7, characterized in that: The size of the first boss in the axial direction ranges from 0.3 mm to 1.3 mm.

9. The battery cell according to claim 8, characterized in that The size of the first boss in the axial direction ranges from 0.8 mm to 1 mm.

10. The battery cell according to any one of claims 1 to 9, characterized in that: The battery cell further includes a sealing ring, which is disposed around the outer periphery of the first boss and abuts between the shell and the terminal body along the axial direction.

11. The battery cell according to claim 10, characterized in that The electrode terminal includes a negative electrode terminal, and the terminal body of the negative electrode terminal includes an external terminal and a composite part; the material of the composite part is different from the material of the external terminal and is the same as the material of the first boss; the external terminal, the composite part and the first boss are distributed in sequence along the axial direction, the composite part covers the lead-out hole, and the sealing ring is abutted between the outer shell and the composite part along the axial direction.

12. The battery cell according to claim 11, characterized in that The axial dimension of the composite portion ranges from 0.1 mm to 0.5 mm.

13. The battery cell according to claim 12, characterized in that: The axial dimension of the composite portion ranges from 0.2 mm to 0.4 mm.

14. The battery cell according to any one of claims 1 to 13, characterized in that: The electrode terminal includes a negative electrode terminal, and the terminal body of the negative electrode terminal includes an external terminal and a composite part; the material of the composite part is different from the material of the external terminal and is the same as the material of the first boss; the external terminal, the composite part and the first boss are distributed in sequence along the axial direction, and the composite part covers the lead-out hole; the sum of the axial dimensions of the composite part and the first boss ranges from 1.0 mm to 1.5 mm.

15. The battery cell according to claim 14, characterized in that The sum of the axial dimensions of the composite portion and the first boss is in the range of 1.2 mm to 1.4 mm.

16. The battery cell according to any one of claims 1 to 15, characterized in that: The electrode terminal includes a negative electrode terminal, and the terminal body of the negative electrode terminal includes an external terminal and a composite part; the material of the composite part is different from the material of the external terminal and is the same as the material of the first boss; the external terminal, the composite part and the first boss are distributed in sequence along the axial direction, and the composite part covers the lead-out hole; the axial dimension range of the external terminal is 1.5mm~2.5mm.

17. The battery cell according to claim 16, characterized in that The axial dimension of the outer terminal ranges from 1.8 mm to 2.2 mm.

18. The battery cell according to any one of claims 1 to 17, characterized in that: The electrode terminal includes a positive electrode terminal, and the axial dimension of the positive electrode terminal ranges from 2.5 mm to 4 mm.

19. The battery cell according to claim 18, characterized in that The axial dimension of the positive electrode terminal ranges from 3 mm to 3.5 mm.

20. A battery, characterized in that: The invention comprises a battery cell according to any one of claims 1 to 19.

21. An electrical device, characterized in that: Comprising a battery according to claim 20.

Images