Battery cell, battery, and electric device

Abstract

The present application is applicable to the technical field of batteries (100), and provides a battery cell (10), a battery (100), and an electric device. The electric device comprises the battery (100), the battery (100) comprises the battery cell (10), and the battery cell (10) comprises a casing (2), an electrode assembly (1), and electrode terminals (3). The casing (2) is provided with lead-out holes (201); the electrode assembly (1) is provided in the casing (2); each electrode terminal (3) comprises a terminal body (31) and a first boss (32), and the terminal body (31) covers the corresponding lead-out hole (201); in the axial direction (Z) of the lead-out holes (201), each first boss (32) is provided at the end of the terminal body (31) close to the electrode assembly (1); and the first bosses (32) pass through the lead-out holes (201) and are connected to the electrode assembly (1). The electrode terminals (3) each comprise the first boss (32) provided in the corresponding lead-out hole (201), so that when the size of the casing (2) is fixed, the electrode terminals (3) can extend into the casing (2). In this way, the height of the portions of the electrode terminals (3) located outside the casing (2) can be reduced, thereby reducing the size of the battery cell (10), thus reducing the space occupied by the battery cell (10) in a case (20), improving the space utilization rate of the case (20), and improving the energy density of the battery (100).

Description

Battery cell, battery and electric device

[0001] Cross-reference to related applications

[0002] This application claims priority to the Chinese patent application No. 202422170291.0, filed on September 4, 2024, and entitled "Battery cell, battery and electric device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of battery, in particular to a battery cell, a battery and an electric device. BACKGROUND

[0004] In the related art, a battery can include a box body and a battery cell arranged in the box body. However, the volume of the battery cell is usually large, thereby occupying a large space inside the box body, resulting in a small space utilization rate of the box body, which is not conducive to the improvement of the energy density of the battery. SUMMARY

[0005] In view of the above problems, the purpose of the embodiments of the present application is to provide a battery cell, a battery and an electric device, which can improve the energy density of the battery.

[0006] The technical scheme adopted by the embodiments of the present application is:

[0007] In a first aspect, the embodiments of the present application provide a battery cell, comprising:

[0008] a shell provided with a lead-out hole;

[0009] an electrode assembly arranged in the shell;

[0010] an electrode terminal comprising a terminal body and a first boss, the terminal body covering 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 arranged in the lead-out hole and connected to the electrode assembly.

[0011] The battery cell provided by the embodiments of the present application, by the electrode terminal comprising the first boss arranged in the lead-out hole, makes the electrode terminal extend into the shell under the condition that the volume of the shell is predetermined, so as to reduce the height of the part of the electrode terminal located outside the shell, thereby reducing the volume of the battery cell, so as to reduce the occupied space of the battery cell in the box body, which helps to improve the space utilization rate of the box body, so as to improve the energy density of the battery.

[0012] In some embodiments, the battery monomer further comprises an adapter, the adapter comprising a body portion and a second boss connected to the body portion; the body portion is arranged in the shell and connected to the electrode assembly; the second boss is arranged protruding towards the first boss in the axial direction and abuts against the first boss.

[0013] In this way, in the case of welding the adapter and the electrode terminal, by abutting and welding the first boss and the second boss, the problem of the adapter being raised relative to the electrode terminal, resulting in welding defects such as explosion points and virtual welds between the electrode terminal and the adapter, can be improved, thereby the problem of the connection between the electrode terminal and the electrode assembly being invalid due to insufficient welding strength between the adapter and the electrode terminal can be improved, and thus the reliability of the battery monomer can be improved.

[0014] In some embodiments, in the axial direction, a groove is arranged on the side of the second boss away from the first boss.

[0015] In this way, the abutting firmness between the second boss and the first boss can be improved, thereby the connection strength between the adapter and the electrode terminal can be improved, and thus the problem of the connection between the electrode terminal and the electrode assembly being invalid can be reduced, and thus the reliability of the battery monomer can be improved.

[0016] In some embodiments, the battery monomer further comprises an insulating member arranged between the electrode assembly and the shell; in the axial direction, the insulating member is provided with a relief hole, the first boss is arranged in the relief hole or is arranged opposite to the relief hole; the relief hole is used for connecting the first boss to the electrode assembly.

[0017] By arranging the insulating member between the electrode assembly and the shell, the insulation between the shell and the electrode assembly can be achieved. Moreover, the relief hole on the insulating member can enable the first boss to be connected to the electrode assembly.

[0018] In some embodiments, in the axial direction, the end of the relief hole close to the electrode assembly protrudes towards the electrode assembly beyond the end of the first boss away from the terminal body.

[0019] In this way, in the case of connecting the first boss and the electrode assembly through the adapter, 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, so as to facilitate the adapter to abut against the end of the first boss away from the terminal body through the second boss. Thus, the connection strength between the adapter and the electrode terminal can be improved, and thus the problem of the connection between the electrode terminal and the electrode assembly being invalid can be reduced, and thus the reliability of the battery monomer can be improved.

[0020] In some embodiments, in the axial direction, the distance between the end of the relief hole close to the electrode assembly and the end of the first boss away from the terminal body is a first distance, and 0.5mm≤the first distance≤1.5mm.

[0021] In this way, on the one hand, the boss can be arranged in the lead-out hole to reduce the size of the battery monomer in the axial direction. On the other hand, the space between the end of the avoidance hole close to the electrode assembly and the end of the first boss away from the terminal body can be used to accommodate sufficient second bosses, so as to improve the connection strength between the adapter and the electrode terminal, thereby reducing the failure of the connection relationship between the electrode terminal and the electrode assembly, and thus improving the reliability of the battery monomer.

[0022] In some embodiments, 0.8mm≤ the first distance ≤1.2mm.

[0023] In this way, on the one hand, the boss can be arranged in the lead-out hole to reduce the size of the battery monomer in the axial direction. On the other hand, the space between the end of the avoidance hole close to the electrode assembly and the end of the first boss away from the terminal body can be used to accommodate sufficient second bosses, so as to improve the connection strength between the adapter and the electrode terminal, thereby reducing the failure of the connection relationship between the electrode terminal and the electrode assembly, and thus improving the reliability of the battery monomer.

[0024] In some embodiments, the size of the first boss in the axial direction is 0.3mm-1.3mm.

[0025] In this way, the first boss has a suitable axial size, which, on the one hand, can reduce the axial size of the part of the electrode terminal outside the shell to reduce the axial size of the battery monomer. On the other hand, it is convenient to improve the connection reliability between the first boss and the electrode assembly.

[0026] In some embodiments, the size of the first boss in the axial direction is 0.8mm-1mm.

[0027] In this way, the first boss has a suitable axial size, which, on the one hand, can reduce the axial size of the part of the electrode terminal outside the shell to reduce the axial size of the battery monomer. On the other hand, it is convenient to improve the connection reliability between the first boss and the electrode assembly.

[0028] In some embodiments, the battery monomer further comprises a sealing ring, which is arranged around the outer periphery of the first boss and abuts between the shell and the terminal body in the axial direction.

[0029] By adopting the above technical scheme, the sealing ring can realize the sealing between the electrode terminal and the shell, and the reliability of the battery monomer can be improved.

[0030] In some embodiments, the electrode terminal comprises a negative electrode terminal, the terminal body of the negative electrode terminal comprises an outer terminal and a composite part; the material of the composite part is different from that of the outer terminal and is the same as that of the first boss; the outer terminal, the composite part and the first boss are sequentially distributed along the axial direction, and 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.

[0031] By covering the lead-out hole with the composite part and abutting the sealing ring between the outer shell and the composite part along the axial direction, the composite interface between the outer terminal and the composite part is distributed along the axial direction of the sealing ring, and the composite interface between the outer terminal and the composite part is separated from the sealing ring by the composite part. In this way, the problem that the electrolyte in the outer shell penetrates from the sealing ring to the composite interface between the outer terminal and the composite part and causes the composite interface between the outer terminal and the composite part to be damaged can be improved, thereby helping to ensure and maintain the bonding strength between the composite part and the outer terminal to some extent, improving the structural strength of the electrode terminal, and improving the problem of the electrode terminal being pulled out of the outer shell.

[0032] In some embodiments, the axial dimension of the composite part ranges from 0.1mm to 0.5mm.

[0033] In this way, the composite part has a relatively appropriate axial dimension. In this way, on the one hand, the bonding strength between the composite part and the outer terminal can be improved to improve the bonding strength between the outer terminal and the first boss, thereby helping to improve the problem of the electrode terminal being pulled out of the outer shell.

[0034] In some embodiments, the axial dimension of the composite part ranges from 0.2mm to 0.4mm.

[0035] In this way, the composite part has a relatively appropriate axial dimension. In this way, on the one hand, the bonding strength between the composite part and the outer terminal can be improved to improve the bonding strength between the outer terminal and the first boss, thereby helping to improve the problem of the electrode terminal being pulled out of the outer shell.

[0036] In some embodiments, the electrode terminal comprises a negative electrode terminal, the terminal body of the negative electrode terminal comprises an outer terminal and a composite part; the material of the composite part is different from that of the outer terminal and is the same as that of the first boss; the outer terminal, the composite part and the first boss are sequentially distributed along the axial direction, and the composite part covers the lead-out hole; and the axial dimension of the composite part and the first boss ranges from 1.0mm to 1.5mm.

[0037] In this way, the composite part and the first boss have a relatively appropriate sum of axial dimensions. In this way, when the first boss is used for welding, such as welding the tab or adapter of the electrode assembly, the welding mark formed by the welding of the first boss does not extend to the outer terminal, which can improve the reliability of the battery cell.

[0038] In some embodiments, the sum of the axial dimensions of the composite portion and the first protrusion ranges from 1.2 mm to 1.4 mm.

[0039] In this way, the sum of the axial dimensions of the composite portion and the first protrusion is appropriate. In this way, on the one hand, when the first protrusion is used for welding, such as welding the tab or adapter of the electrode assembly, the welding mark formed by welding the first protrusion does not extend to the outer terminal, which can improve the reliability of the battery monomer. On the other hand, when the axial dimension of the electrode terminal is predetermined, the outer terminal can have an appropriate axial dimension, which facilitates the connection of the outer terminal and the external conductive component.

[0040] In some embodiments, the electrode terminal includes a negative electrode terminal, the terminal body of the negative electrode terminal includes an outer terminal and a composite portion; the material of the composite portion is different from that of the outer terminal, and the same as that of the first protrusion; the outer terminal, the composite portion and the first protrusion are sequentially arranged along the axial direction, and the composite portion covers the lead-out hole; the axial dimension of the outer terminal ranges from 1.5 mm to 2.5 mm.

[0041] In this way, the outer terminal has an appropriate axial dimension. In this way, on the one hand, the outer terminal has a large structural strength, which facilitates the composite of the outer terminal and the composite portion. On the other hand, when the outer terminal and the external conductive component are welded, the welding mark formed by welding is located on the outer terminal and does not extend to the composite portion and the first protrusion, which can improve the reliability of the battery monomer.

[0042] In some embodiments, the axial dimension of the outer terminal ranges from 1.8 mm to 2.2 mm.

[0043] In this way, the outer terminal has an appropriate axial dimension. In this way, on the one hand, the outer terminal has a large structural strength, which facilitates the composite of the outer terminal and the composite portion. On the other hand, when the outer terminal and the external conductive component are welded, the welding mark formed by welding is located on the outer terminal and does not extend to the composite portion and the first protrusion, which can improve the reliability of the battery monomer.

[0044] 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.

[0045] In this way, the positive electrode terminal has an appropriate axial dimension. In this way, on the one hand, the positive electrode terminal can be welded with the external conductive component and the adapter without interference as much as possible. On the other hand, the axial dimension of the positive electrode terminal can be effectively reduced, thereby ensuring the energy density of the battery monomer to a certain extent.

[0046] In some embodiments, the axial dimension of the positive electrode terminal ranges from 3mm to 3.5mm.

[0047] In this way, the positive electrode terminal has a proper axial dimension. In this way, on the one hand, the positive electrode terminal can be welded with the external conductive component and the adapter respectively without interference as much as possible. On the other hand, the axial dimension of the positive electrode terminal can be effectively reduced, so that the energy density of the battery cell can be ensured to a certain extent.

[0048] In a second aspect, the embodiments of the present application provide a battery, comprising the battery cell.

[0049] The battery provided by the embodiments of the present application can reduce the occupied space of the battery cell in the box by using the above-mentioned battery cell, which helps to improve the space utilization of the box and improve the energy density of the battery.

[0050] In a third aspect, the embodiments of the present application provide a power device, comprising the battery.

[0051] The power device provided by the embodiments of the present application can improve the space utilization of the box by using the above-mentioned battery, so as to improve the energy density of the battery and improve the reliability of the power device.

[0052] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following will specifically describe the embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0053] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or exemplary technical description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creating any creative labor.

[0054] Fig. 1 is a schematic view of a vehicle provided by some embodiments of the present application;

[0055] Fig. 2 is an exploded view of a battery provided by some embodiments of the present application;

[0056] Fig. 3 is a perspective view of a battery cell provided by some embodiments of the present application;

[0057] Fig. 4 is an exploded view of a battery cell provided by some embodiments of the present application;

[0058] Fig. 5 is a partial structure view of Fig. 4;

[0059] Fig. 6 is a sectional view of Fig. 3 along A-A;

[0060] Fig. 7 is an enlarged view of B in Fig. 6;

[0061] Fig. 8 is an enlarged view of C in Fig. 7;

[0062] Fig. 9 is a structural view of an electrode terminal of a battery cell according to some embodiments of the present application;

[0063] Fig. 10 is a sectional view of Fig. 9 along D-D;

[0064] Fig. 11 is an enlarged view of E in Fig. 6.

[0065] In the drawings, reference numerals: 1000-vehicle; 100-battery; 200-controller; 300-motor; 10-battery cell; 20-box; 210-first part; 220-second part; 1-electrode assembly; 2-outer shell; 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-combination part; 32-first boss; 4-adapter; 401-groove; 41-body part; 42-second boss; 5-insulating member; 501-avoidance hole; 502-first end; 51-insulating body; 52-third boss; 6-sealing ring; 7-upper plastic; 8-fixing member; H1-first distance; L1-first dimension; L2-second dimension; L3-third dimension; L4-fourth dimension; Z-axial direction; X-radial direction. DETAILED DESCRIPTION

[0066] Embodiments of the present application are described in detail below with reference to the accompanying drawings, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.

[0067] All embodiments and optional embodiments of the present application can be combined with each other to form new technical solutions, if not specifically stated.

[0068] All technical features and optional technical features of the embodiments of the present application can be combined with each other to form new technical solutions, if not specifically stated.

[0069] In the description of the embodiments of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0070] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and should not be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features.

[0071] In the description of the embodiments of the present application, "a plurality of" means two or more, unless otherwise explicitly specified and limited, and "two or more" includes two. Accordingly, the meaning of "a plurality of groups" is two or more groups, including two groups.

[0072] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0073] In the description of the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which can represent: A exists, A and B exist, and B exists. In addition, in the present application, the character " / ", generally represents that the front and rear associated objects are in an "or" relationship.

[0074] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to it and equivalent parts can be substituted for the parts thereof without departing from the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any way as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0075] In the related art, a battery can include a box body and a battery cell arranged in the box body. However, the volume of the battery cell is usually large, thereby occupying a large space inside the box body, resulting in a small space utilization rate of the box body, which is not conducive to the improvement of the energy density of the battery.

[0076] Specifically, the battery cell includes an electrode assembly, a housing, and an electrode terminal, the electrode assembly is arranged in the housing, and the electrode terminal is arranged on the housing and connected to the electrode assembly.

[0077] In some cases, the electrode terminal is located outside the housing and has a large height, so that the height of the battery cell is large. In this way, in the case that the volume of the housing is predetermined, the battery cell has a large volume, thereby occupying a large space inside the box body, resulting in a small space utilization rate of the box body.

[0078] Based on the above considerations, the embodiments of the present application provide a battery cell, a battery, and a power consumption device. The electrode terminal includes a first boss arranged in the lead-out hole, so that in the case that the volume of the housing is predetermined, the electrode terminal can extend into the housing. In this way, the height of the part of the electrode terminal located outside the housing can be reduced, so as to reduce the volume of the battery cell. In this way, the occupied space of the battery cell in the box body can be reduced, which is helpful to improve the space utilization rate of the box body, so as to improve the energy density of the battery.

[0079] In some embodiments, the battery cell related to the embodiments of the present application can be used in a power consumption device using the battery cell or the battery as a power source.

[0080] The power consumption device related to the embodiments of the present application can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, a vehicle, a ship, a spacecraft, and the like. The electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, and an electric plane toy, and the like. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, and the like. According to the power source, the vehicle can be a fuel car, a gas car, or a new energy car. The new energy car can be a pure electric car, a hybrid electric car, or a range extended car, and the like. According to the driving mode, the vehicle can be a front-wheel drive car, a rear-wheel drive car, or an all-wheel drive car.

[0081] In other embodiments, the battery cell related to the embodiments of the present application can also be used in an energy storage system using the battery cell or the battery as an energy storage element. The energy storage system can include an energy storage container, an energy storage cabinet, and the like.

[0082] The battery according to embodiments of the present application can be a single physical module including 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, in parallel, or in a mixed connection, where the mixed connection means that there are both series and parallel connections among the multiple battery cells.

[0083] In some embodiments, the battery can be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0084] In some embodiments, the battery can be a battery pack, which can include a box and battery cells. As an example, the battery cells can be directly accommodated in the box. As an example, the battery cells can also be first arranged to form a battery module, and then accommodated in the box.

[0085] As an example, the multiple battery cells can be fixed to form a battery module by a cable tie or the like.

[0086] As an example, the multiple battery cells can also be fixed to form a battery module by an end plate, a side plate, or the like.

[0087] The battery cell according to embodiments of the present application refers to the smallest unit that stores and outputs electric energy. The battery cell can be a secondary battery or a primary battery. The battery cell can be, but is not limited to, a metal battery, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery. The battery cell can be in the shape of a cylinder, a flat body, a cuboid, or other shapes.

[0088] For ease of description, embodiments of the present application take a vehicle as an example for description.

[0089] In some embodiments, referring to FIG. 1, FIG. 1 is a schematic diagram of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 is internally provided with the battery 100 described above, which can be arranged at the bottom, the head, or the tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as an operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, where the controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation, and driving.

[0090] In some embodiments, the battery 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0091] In some embodiments, referring to FIG. 2, an exploded view of the battery 100 is shown. The battery 100 can include a case 20 and a battery cell 10. The case 20 is a structure having an internal space for accommodating the battery cell 10.

[0092] The case 20 can have various structures. In some embodiments, the case 20 can include a first part 210 and a second part 220, which are coupled to each other and together define an internal space of the case 20. The first part 210 can be a hollow structure having an opening at one end, and the second part 220 can be a plate structure coupled to the opening side of the first part 210 to define the internal space of the case 20 together with the first part 210. Alternatively, referring to FIG. 2, the first part 210 and the second part 220 can each be a hollow structure having an opening at one end, and the opening side of the first part 210 can be coupled to the opening side of the second part 220 to define the internal space of the case 20 together with the first part 210 and the second part 220. The case 20 formed by the first part 210 and the second part 220 can have various shapes, such as a cylinder, a cuboid, etc.

[0093] In some embodiments, referring to FIG. 2, a plurality of 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 plurality of battery cells 10 can be directly accommodated in the internal space of the case 20. In other embodiments, the plurality of battery cells 10 can be connected in series, in parallel, or in a mixed connection and then arranged and fixed to form a battery module, and the battery module can be accommodated in the internal space of the case 20. In yet other embodiments, the plurality of battery cells 10 can be connected in series, in parallel, or in a mixed connection and then arranged and fixed to form a plurality of battery modules, and the plurality of battery modules can be connected in series, in parallel, or in a mixed connection to form a whole, which can be accommodated in the internal space of the case 20.

[0094] In some embodiments, the case 20 of the battery 100 can be a part of a chassis structure of a vehicle 1000. For example, a part of the case 20 can be at least a part of the chassis of the vehicle 1000, or a part of the case 20 can be at least a part of a cross beam and a longitudinal beam of the vehicle 1000.

[0095] In some embodiments, referring to FIGS. 3 and 4, a perspective view of the battery cell 10 is shown. The battery cell 10 can include an electrode assembly 1, a case 2, and an electrode terminal 3.

[0096] The electrode assembly 1 is a component in which electrochemical reactions occur in the battery cell 10. Among them, the electrode assembly 1 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a diaphragm is arranged between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have a part with active material, which constitutes the main body of the electrode assembly 1, and a part without active material, which respectively constitutes the tab of the positive electrode sheet and the negative electrode sheet. The tab of the positive electrode sheet is the positive electrode tab, and the tab of the negative electrode sheet is the negative electrode tab, and the positive electrode tab and the negative electrode tab can be located at one end of the main body or at opposite ends of the main body.

[0097] The number of electrode assemblies 1 in the battery cell 10 can be one or multiple.

[0098] In some cases, the electrode assembly 1 can also be referred to as a bare cell, a winding body, a stacking body, etc.

[0099] In some embodiments, the battery cell 10 can also include an electrolyte, which plays a role in conducting ions between the positive electrode sheet and the negative electrode sheet. Among them, the electrolyte involved in the embodiments of the present application can be liquid, gel or solid.

[0100] The shell 2 is a structure for defining the internal environment of the battery cell 10. Among them, the shell 2 is used to accommodate the electrode assembly 1 and the electrolyte.

[0101] In some embodiments, please continue to refer to FIG. 3 and FIG. 4, the shell 2 can include a shell body 21 and an end cover 22, which are components for jointly defining the internal environment of the battery cell 10, and the internal environment defined by the shell body 21 and the end cover 22 is used to accommodate the electrode assembly 1 and the electrolyte. Among them, the shell body 21 and the end cover 22 can be independent components. Specifically, as shown in FIG. 3 and FIG. 4, the shell body 21 has an opening, and the end cover 22 is arranged at the opening of the shell body 21 to jointly define the internal environment of the battery cell 10 with the shell body 21, and to isolate the internal environment of the battery cell 10 from the external environment. Alternatively, the shell body 21 and the end cover 22 can also be an integrated structure. Specifically, the end cover 22 and the shell body 21 can form a common connecting surface before the electrode assembly 1 is put into the shell, and when the electrode assembly 1 needs to be packaged after being put into the shell, the end cover 22 is then closed to the shell body 21.

[0102] Among them, the number of end covers 22 can be one, as shown in FIG. 3 and FIG. 4. Alternatively, the number of end covers 22 can also be two, and the two end covers 22 are respectively arranged at opposite ends of the shell body 21.

[0103] Among them, the shell body 21 can be cylindrical, square, etc., which can be determined according to the specific shape and size of the electrode assembly 1. Moreover, the materials of the shell body 21 and the end cover 22 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0104] The electrode terminal 3 refers to a structure with electrically conductive performance. The electrode terminal 3 is arranged on the shell 2 and connected to the electrode assembly 1. The electrode terminal 3 serves as a current transmission end of the battery monomer 10 for transmitting current.

[0105] 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 through welding, bonding or the like. Alternatively, as shown in FIG. 4, an adapter 4 can be arranged between the electrode terminal 3 and the tab. The adapter 4 is connected to the electrode terminal 3 and the tab to realize the adapter between the electrode terminal 3 and the tab to enable current flow, thereby indirectly realizing the connection between the electrode terminal 3 and the tab.

[0106] The adapter 4 refers to a metal structure with electrically conductive performance, for example, but not limited to, a copper bar.

[0107] In some embodiments, referring to FIG. 4, the electrode terminal 3 is provided as two, which are a positive electrode terminal 3a and a negative electrode terminal 3b. The positive electrode terminal 3a is in conductive connection with the positive tab of the electrode assembly 1, and the negative electrode terminal 3b is in conductive connection with the negative tab of the electrode assembly 1.

[0108] The electrode terminal 3 can be arranged on the shell body 21 of the shell 2 or on the end cover 22 of the shell 2. The positive electrode terminal 3a and the negative electrode terminal 3b can be arranged on the shell body 21 at the same time. Alternatively, as shown in FIG. 4, the positive electrode terminal 3a and the negative electrode terminal 3b can be arranged on the end cover 22 at the same time. Alternatively, one of the positive electrode terminal 3a and the negative electrode terminal 3b is arranged on the shell body 21, and the other is arranged on the end cover 22.

[0109] As shown in FIG. 4, the positive electrode terminal 3a and the negative electrode terminal 3b can be arranged at the same end of the shell 2. Alternatively, the positive electrode terminal 3a and the negative electrode terminal 3b can be arranged at opposite ends of the shell 2.

[0110] The electrode terminal 3 can be made of metal material, for example, but not limited to, a pole. As an example, the positive electrode terminal 3a is an aluminum pole made of aluminum material, and the negative electrode terminal 3b is a composite pole made of aluminum and copper material. The copper material of the negative electrode terminal 3b is used to connect with the tab.

[0111] Please refer to FIGS. 4-10 in combination with other drawings. FIG. 5 is a partial structural view of FIG. 4, FIG. 6 is a sectional view of FIG. 3 along A-A, FIG. 7 is an enlarged view of B in FIG. 6, FIG. 8 is an enlarged view of C in FIG. 7, FIG. 9 is a structural view of an electrode terminal 3 of a battery cell 10 provided by some embodiments of the present application, and FIG. 10 is a sectional view of FIG. 9 along D-D. The electrode terminal 3 shown in FIGS. 7-10 is a negative electrode terminal 3b. The battery cell 10 provided by embodiments of the present application includes a housing 2, an electrode assembly 1, and an electrode terminal 3. The housing 2 is provided with a lead-out hole 201. The electrode assembly 1 is arranged in the housing 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 arranged at one end of the terminal body 31 close to the electrode assembly 1 along an axial direction Z of the lead-out hole 201. The first boss 32 is arranged in the lead-out hole 201 and connected to the electrode assembly 1.

[0112] The lead-out hole 201 is a through hole penetrating a wall of the housing 2, and is used for connecting 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.

[0113] Hereinafter, the axial direction Z refers to the axial direction Z of the lead-out hole 201 unless otherwise specified. In some cases, the axial direction Z of the lead-out hole 201 can be the height direction of the battery cell 10, i.e., the height direction of the electrode terminal 3.

[0114] The terminal body 31 and the first boss 32 are two parts of the electrode terminal 3, and both have electric conductivity. The electrode terminal 3 can include a positive electrode terminal 3a and a negative electrode terminal 3b. As an example, in the positive electrode terminal 3a, the material of the terminal body 31 and the first boss 32 can both be aluminum. As an example, in the negative electrode terminal 3b, the material of the terminal body 31 is aluminum, and the material of the first boss 32 is copper.

[0115] The terminal body 31 covers the lead-out hole 201, the first boss 32 is arranged at one end of the terminal body 31 close to the electrode assembly 1 along the axial direction Z, and is arranged in the lead-out hole 201, so that the terminal body 31 is arranged at one end of the housing 2 away from the electrode assembly 1 along the axial direction Z. That is, at least part of the terminal body 31 is located outside the housing 2. It can be understood that the terminal body 31 is the part of the electrode terminal 3 located outside the housing 2, and is used to connect with the external conductive component.

[0116] The first boss 32 is arranged in the lead-out hole 201, which means that at least part 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 part of the electrode terminal 3 located in the housing 2.

[0117] The first boss 32 is connected to the electrode assembly 1 to realize 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, welded to the electrode assembly 1. The first boss 32 can also be connected to the electrode assembly 1 through the adapter 4. Specifically, the adapter 4 is connected to the first boss 32 and the electrode assembly 1 to realize conduction between the electrode assembly 1 and the first boss 32. For example, the first boss 32 and the adapter 4 are welded.

[0118] 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 be arranged in the lead-out hole 201. The radial dimension refers to the dimension in the radial direction X.

[0119] The inner circumferential wall of the lead-out hole 201 can be arranged to extend in the circumferential direction to substantially define a circle. The radius direction of the circle defined by the inner circumferential wall of the lead-out hole 201 is the radial direction X of the lead-out hole 201. In the embodiments of the present application, unless otherwise specified, the radial direction X refers to the radial direction X of the lead-out hole 201.

[0120] It should be noted that the terminal body 31 is insulatedly connected to the shell 2, and is arranged on the shell 2. Specifically, an insulating structure can be arranged between the terminal body 31 and the shell 2, so that the terminal body 31 and the shell 2 are insulatedly connected through the insulating structure. The insulating structure can be, but is not limited to, the upper plastic 7 described below.

[0121] The battery monomer 10 provided by the embodiments of the present application includes the first boss 32 arranged in the lead-out hole 201 through the electrode terminal 3, so that the electrode terminal 3 can extend into the shell 2 under the condition that the volume of the shell 2 is predetermined. In this way, the height of the part of the electrode terminal 3 located outside the shell 2 can be reduced, so as to reduce the volume of the battery monomer 10. In this way, the occupied space of the battery monomer 10 in the box 20 can be reduced, which helps to improve the space utilization of the box 20, so as to improve the energy density of the battery 100.

[0122] Moreover, the first boss 32 of the electrode terminal 3 is arranged in the lead-out hole 201, which can reduce the height of the part of the electrode terminal 3 located outside the shell 2. In this way, the volume of the battery monomer 10 can be reduced under the condition that the volumes of the shell 2 and the electrode assembly 1 are predetermined, so as to help to improve the energy density of the battery monomer 10.

[0123] In some embodiments, please refer to FIGS. 7-10, and in combination with other drawings. The battery monomer 10 further comprises a adapter 4, the adapter 4 comprises a body part 41 and a second boss 42 connected to the body part 41. The body part 41 is arranged in the shell 2 and connected to the electrode assembly 1. The second boss 42 is arranged protruding along the axial direction Z towards the first boss 32 and abuts against the first boss 32.

[0124] The adapter 4 refers to a component for connecting the first boss 32 and the electrode assembly 1 to realize the conduction between the electrode terminal 3 and the electrode assembly 1. Wherein, the adapter 4 can be but not limited to a copper bar, a tab.

[0125] The body part 41 and the second boss 42 are two parts of the adapter 4. Wherein, the body part 41 is connected to the electrode assembly 1 to realize the connection between the adapter 4 and the electrode assembly 1.

[0126] The second boss 42 is arranged protruding along the axial direction Z towards the first boss 32, which means that in the axial direction Z, the second boss 42 protrudes from the body part 41 towards the first boss 32.

[0127] 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 realize the connection between the first boss 32 and the adapter 4. Wherein, the second boss 42 can be but not limited to welded with the first boss 32.

[0128] By arranging the second boss 42 of the adapter 4 protruding along the axial direction Z towards the first boss 32 and abutting against the first boss 32, the second boss 42 can be stably and firmly connected to the first boss 32. In this way, in the case of welding the adapter 4 and the electrode terminal 3, by abutting and welding the first boss 32 and the second boss 42 with each other, the problem of electrode terminal 3 and adapter 4 rising relative to each other, resulting in the problems of welding defects such as explosion points and virtual welding between the electrode terminal 3 and the adapter 4, can be improved, so that the problem of the connection relationship between the electrode terminal 3 and the electrode assembly 1 being invalid due to the insufficient welding strength between the adapter 4 and the electrode terminal 3 can be improved, and thus the reliability of the battery monomer 10 can be improved.

[0129] In some embodiments, please refer to FIGS. 7 and 8, and in combination with other drawings. In the axial direction Z, the side of the second boss 42 away from the first boss 32 is provided with a groove 401.

[0130] Wherein, the adapter 4 can adopt but is not limited to a stamping method to form the second boss 42 and the groove 401. Specifically, the side of the adapter 4 away from the first boss 32 can be stamped, so that the side of the adapter 4 away from the first boss 32 is recessed to form the groove 401, and the side of the adapter 4 close to the first boss 32 is protruding to form the second boss 42.

[0131] By setting the groove 401, the second boss 42 can be elastically deformed relative to the body portion 41. In this way, under the action of the body portion 41, the second boss 42 can elastically abut against and be connected to the first boss 32. By being so arranged, the abutting firmness between the second boss 42 and the first boss 32 can be improved, so that the connection strength of the adapter 4 and the electrode terminal 3 can be improved, and thus the problem of failure of the connection relationship between the electrode terminal 3 and the electrode assembly 1 can be reduced, and thus the reliability of the battery monomer 10 can be improved.

[0132] In some embodiments, please refer to FIG. 4, FIG. 5, FIG. 7 to FIG. 10, and combine with other drawings. The battery monomer 10 further comprises an insulating piece 5, which is arranged between the electrode assembly 1 and the shell 2. In the axial direction Z, the insulating piece 5 is provided with a relief hole 501. In the axial direction Z, the first boss 32 is arranged in the relief hole 501 or is arranged opposite to the relief hole 501. The relief hole 501 is used for connecting the first boss 32 to the electrode assembly 1.

[0133] The insulating piece 5 refers to a component with insulating performance, which is mainly arranged between the shell 2 and the electrode assembly 1, and is used for realizing the insulation effect between the shell 2 and the electrode assembly 1. The insulating piece 5 can be a plastic, for example.

[0134] The relief hole 501 refers to a through hole formed through the insulating piece 5 along the axial direction Z, which is used for connecting the first boss 32 to the electrode assembly 1.

[0135] In some possible designs, as shown in FIG. 7 and FIG. 8, part of the insulating piece 5 is located in the lead-out hole 201, so that at least part of the relief hole 501 is located in the lead-out hole 201 and communicates with the lead-out hole 201. Alternatively, in other possible designs, the lead-out hole 201 and the relief hole 501 are arranged in sequence along the axial direction Z and communicate with each other.

[0136] In some possible designs, as shown in FIG. 7 and FIG. 8, the first boss 32 is arranged in the relief hole 501, i.e., at least part of the first boss 32 is located in the relief hole 501. Alternatively, in other possible designs, the first boss 32 and the relief hole 501 are arranged opposite to each other along the axial direction Z.

[0137] By arranging the insulating piece 5 between the electrode assembly 1 and the shell 2, the insulation between the shell 2 and the electrode assembly 1 can be realized. Moreover, the relief hole 501 on the insulating piece 5 can make the first boss 32 connected to the electrode assembly 1.

[0138] In some embodiments, please refer to FIG. 7 and FIG. 8, and combine with other drawings. In the axial direction Z, the end of the relief hole 501 close to the electrode assembly 1 extends towards the electrode assembly 1 beyond the end of the first boss 32 away from the terminal body 31.

[0139] For ease of description, the end of the avoiding hole 501 close to the electrode assembly 1 along the axial direction Z is defined as the first end 502.

[0140] It can be understood that, along the axial direction Z, the first end 502 is located beyond the end of the first boss 32 away from the terminal body 31 towards the electrode assembly 1, so that there is a certain distance between the end of the first boss 32 away from the terminal body 31 and the first end 502 along the axial direction Z, and the distance is the first distance H1 referred to below.

[0141] In this way, in the case of connecting the first boss 32 and the electrode assembly 1 through 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 abuts against the end of the first boss 32 away from the terminal body 31 through the second boss 42. Thus, it is helpful to improve the connection strength between the adapter 4 and the electrode terminal 3, and in turn can reduce the problem of invalidation of the connection relationship between the electrode terminal 3 and the electrode assembly 1, so that the reliability of the battery monomer 10 can be improved.

[0142] It needs to be added here that the insulating piece 5 can include an insulating body 51 and a third boss 52. The insulating body 51 is arranged between the shell 2 and the electrode assembly 1 to achieve the insulation effect between the shell 2 and the electrode assembly 1. Along the axial direction Z, the third boss 52 is arranged at the end of the insulating body 51 close to the electrode assembly 1 and is used to press against the electrode assembly 1, so that the installation firmness of the electrode assembly 1 in the shell 2 can be improved.

[0143] Among them, along the axial direction Z, the end of the avoiding hole 501 close to the electrode assembly 1 beyond the end of the first boss 32 away from the terminal body 31 towards the electrode assembly 1 means that along the axial direction Z, the side of the insulating body 51 close to the electrode assembly 1 beyond the end of the first boss 32 away from the terminal body 31 towards the electrode assembly 1. That is, the first end 502 is arranged on the side of the insulating body 51 close to the electrode assembly 1 along the axial direction Z.

[0144] In some embodiments, please refer to FIG. 7 and FIG. 8, and combine with other drawings. Along the axial direction Z, the distance between the end of the avoiding hole 501 close to the electrode assembly 1 and the end of the first boss 32 away from the terminal body 31 is the first distance H1, 0.5mm≤the first distance H1≤1.5mm.

[0145] The range of the first distance H1 is [0.5mm, 1.5mm], and specifically can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, etc.

[0146] It can be understood that the first distance H1 refers to the distance between the side of the insulating body 51 close to the electrode assembly 1 and the end of the first boss 32 close to the terminal body 31 in the axial direction Z.

[0147] In this way, the avoidance hole 501 has a proper distance between the end close to the electrode assembly 1 and the end of the first boss 32 away from the terminal body 31, on the one hand, so that the boss can be arranged in the lead-out hole 201 to reduce the size of the battery monomer 10 in the axial direction Z. On the other hand, the space between the end close to the electrode assembly 1 of the avoidance hole 501 and the end of the first boss 32 away from the terminal body 31 can be used to accommodate sufficient second bosses 42, so as to improve the connection strength between the adapter 4 and the electrode terminal 3, thereby reducing the problem of invalid connection between the electrode terminal 3 and the electrode assembly 1, so as to improve the reliability of the battery monomer 10.

[0148] In some embodiments, please refer to FIGS. 7 and 8, and combine with other drawings. 0.8mm≤first distance H1≤1.2mm.

[0149] The first distance H1 is in the range of [0.8mm, 1.2mm], and can be specifically 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1.0mm, 1.05m, 1.1mm, 1.15mm, 1.2mm, etc.

[0150] In this way, on the one hand, the boss can be arranged in the lead-out hole 201 to reduce the size of the battery monomer 10 in the axial direction Z. On the other hand, the space between the end close to the electrode assembly 1 of the avoidance hole 501 and the end of the first boss 32 away from the terminal body 31 can be used to accommodate sufficient second bosses 42, so as to improve the connection strength between the adapter 4 and the electrode terminal 3, thereby reducing the problem of invalid connection between the electrode terminal 3 and the electrode assembly 1, so as to improve the reliability of the battery monomer 10.

[0151] In some embodiments, please refer to FIGS. 7 to 10, and combine with other drawings. The size of the first boss 32 in the axial direction Z is in the range of 0.3mm~1.3mm.

[0152] For the convenience of description, the axial size of the first boss 32 is set as the first size L1, and the first size L1 is in the range of [0.3mm, 1.3mm], and can be specifically 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, etc.

[0153] In this way, the first boss 32 has a proper axial dimension, so that on the one hand, the axial dimension of the part of the electrode terminal 3 outside the shell 2 can be reduced to some extent, so as to reduce the axial dimension of the battery monomer 10. On the other hand, it is convenient to improve the connection reliability between the first boss 32 and the electrode assembly 1.

[0154] In some embodiments, please refer to FIGS. 7-10, and combine with other drawings. The first boss 32 has a dimension in the axial direction Z ranging from 0.8mm to 1mm.

[0155] It can be understood that the first dimension L1 ranges from 0.8mm to 1mm, and can be specifically 0.8mm, 0.82mm, 0.85mm, 0.87mm, 0.9mm, 0.83mm, 0.95mm, 0.97mm, 1.0mm, etc.

[0156] In this way, the first boss 32 has a proper axial dimension, so that on the one hand, the axial dimension of the part of the electrode terminal 3 outside the shell 2 can be reduced to some extent, so as to reduce the axial dimension of the battery monomer 10. On the other hand, it is convenient to improve the connection reliability between the first boss 32 and the electrode assembly 1.

[0157] In some embodiments, please refer to FIGS. 7 and 8, and combine with other drawings. The battery monomer 10 further comprises a sealing ring 6, which is arranged around the outer periphery of the first boss 32 and abuts between the shell 2 and the terminal body 31 in the axial direction Z.

[0158] The sealing ring 6 refers to a component with sealing performance, which can be but is not limited to a rubber ring or a silica gel ring.

[0159] By adopting the above technical solution, the sealing ring 6 can realize the sealing between the electrode terminal 3 and the shell 2, and can improve the reliability of the battery monomer 10.

[0160] In some embodiments, as shown in FIGS. 7 and 8, the sealing ring 6 is arranged around the outer periphery of the first boss 32 and is partially sealed between the outer periphery of the first boss 32 and the inner peripheral wall of the lead-out hole 201.

[0161] In this way, the sealing ring 6 can isolate the first boss 32 and the inner peripheral wall of the lead-out hole 201, so as to realize the isolation between the electrode terminal 3 and the shell 2.

[0162] In addition, the sealing ring 6 is arranged around the outer periphery of the first boss 32, and the first boss 32 is arranged at the end of the terminal body 31 away from the electrode assembly 1 in the axial direction Z, so that when the end of the first boss 32 away from the terminal body 31 in the axial direction Z is welded, the arrangement of the first boss 32 can prolong the distance between the end of the first boss 32 away from the terminal body 31 in the axial direction Z and the sealing ring 6, so that the heat generated during welding of the first boss 32 can be quickly transferred to the sealing ring 6, thereby improving the problem that the sealing ring 6 is burned out. When the end of the first boss 32 away from the terminal body 31 in the axial direction Z is welded, the first boss 32 can be used for welding the adapter 4, or can be used for directly welding the tab of the electrode assembly 1.

[0163] In some embodiments, please refer to FIGS. 7-10, 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 outer terminal 311 and a composite part 312. The material of the composite part 312 is different from that of the outer terminal 311, and is the same as that of the first boss 32. The outer terminal 311, the composite part 312 and the first boss 32 are sequentially arranged in the axial direction Z, and the composite part 312 covers the lead-out hole 201.

[0164] The outer terminal 311 and the composite part 312 are two parts of the terminal body 31, and the composite part 312 is used to connect the outer terminal 311, so that the outer terminal 311, the composite part 312 and the first boss 32 form a composite pole.

[0165] The material of the composite part 312 is different from that of the outer terminal 311, and the material of the composite part 312 is the same as that of the first boss 32. As an example, the material of the outer terminal 311 is aluminum, and the materials of the composite part 312 and the first boss 32 are both copper.

[0166] As shown in FIGS. 7-10, the composite part 312 is connected to the end of the outer terminal 311 close to the electrode assembly 1 in the axial direction Z, and the first boss 32 is arranged at the end of the composite part 312 close to the electrode assembly 1 in the axial direction Z. The outer terminal 311 and the composite part 312 can be combined by welding, cold pressing or the like, and the composite part 312 and the first boss 32 can be connected by welding or integrated molding.

[0167] The outer terminal 311 is used to connect with an external conductive part, which can be in the form of welding but is not limited thereto.

[0168] The radial dimension of the composite part 312 is greater than the radial dimension of the first boss 32, so that the composite part 312 can cover the lead-out hole 201, and the first boss 32 is arranged in the lead-out hole 201.

[0169] In some embodiments, please refer to FIG. 7 to FIG. 10, and combine with other drawings. The sealing ring 6 is arranged between the shell 2 and the composite part 312 along the axial direction Z.

[0170] By covering the lead-out hole 201 through the composite part 312, the sealing ring 6 is arranged between the shell 2 and the composite part 312 along the axial direction Z, so that the composite interface between the outer terminal 311 and the composite part 312 is distributed along the axial direction Z of the sealing ring 6, and the composite interface between the outer terminal 311 and the composite part 312 is separated from the sealing ring 6 by the composite part 312. In this way, the problem that the electrolyte in the shell 2 penetrates from the sealing ring 6 to the composite interface between the outer terminal 311 and the composite part 312, causing the composite interface between the outer terminal 311 and the composite part 312 to be damaged, can be improved, thereby helping to ensure and maintain the bonding strength between the composite part 312 and the outer terminal 311 to some extent, to improve the structural strength of the electrode terminal 3 and improve the problem of the electrode terminal 3 being pulled out of the shell 2.

[0171] In addition, by making the radial dimension of the composite part 312 greater than the radial dimension of the first boss 32, the bonding strength between the composite part 312 and the outer terminal 311 can be improved, and in turn the bonding strength between the outer terminal 311 and the first boss 32 can be improved, which also helps to improve the problem of the electrode terminal 3 being pulled out of the shell 2.

[0172] In some embodiments, please refer to FIG. 7 to FIG. 10, and combine with other drawings. The axial dimension of the composite part 312 ranges from 0.1 mm to 0.5 mm.

[0173] For ease of description, the axial dimension of the composite part 312 is set as a second dimension L2.

[0174] The second dimension L2 ranges from 0.1 mm to 0.5 mm, and can be 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, etc.

[0175] In this way, the composite part 312 has a relatively appropriate dimension in the axial direction Z. In this way, on the one hand, the bonding strength between the composite part 312 and the outer terminal 311 can be improved, and in turn the bonding strength between the outer terminal 311 and the first boss 32 can be improved, which helps to improve the problem of the electrode terminal 3 being pulled out of the shell 2.

[0176] In some embodiments, please refer to FIG. 7 to FIG. 10, and combine with other drawings. The axial dimension of the composite part 312 ranges from 0.2 mm to 0.4 mm.

[0177] It can be understood that the second size L2 ranges from [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.

[0178] In this way, the composite part 312 has a suitable size in the axial direction Z. In this way, on the one hand, the bonding strength between the composite part 312 and the outer terminal 311 can be improved, so as to improve the bonding strength between the outer terminal 311 and the first boss 32, which helps to improve the problem of the electrode terminal 3 being pulled out from the shell 2.

[0179] In some embodiments, please refer to FIGS. 7-10, and combine 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 outer terminal 311 and a composite part 312. The material of the composite part 312 is different from that of the outer terminal 311, and is the same as that of the first boss 32. The outer terminal 311, the composite part 312 and the first boss 32 are sequentially distributed along the axial direction Z, and the composite part 312 covers the lead-out hole 201. The sum of the axial sizes of the composite part 312 and the first boss 32 ranges from 1.0mm to 1.5mm.

[0180] It can be understood that the sum of the first size L1 and the second size L2 ranges from [1.0mm, 1.5mm], and specifically can be 1.0mm, 1.05mm, 1.1mm, 1.15mm, 1.2mm, 1.25mm, 1.3mm, 1.35mm, 1.4mm, 1.45mm, 1.5mm, etc.

[0181] In this way, the composite part 312 and the first boss 32 have a suitable sum of sizes in the axial direction Z. In this way, when the first boss 32 is used for welding, such as welding the tab or the adapter 4 of the electrode assembly 1, the welding mark formed by welding the first boss 32 does not extend to the outer terminal 311, which can improve the reliability of the battery monomer 10. When the first boss 32 is welded to the tab or the adapter 4, the welding mark formed by welding can be located on the first boss 32, or on the first boss 32 and the composite part 312.

[0182] In some embodiments, please refer to FIGS. 7-10, and combine with other drawings. The sum of the axial sizes of the composite part 312 and the first boss 32 ranges from 1.2mm to 1.4mm.

[0183] It can be understood that the sum of the first dimension L1 and the second dimension L2 ranges from [1.2mm, 1.4mm], and can be 1.2mm, 1.22mm, 1.25mm, 1.28mm, 1.3mm, 1.33mm, 1.35mm, 1.37mm, 1.4mm, etc.

[0184] In this way, the composite part 312 and the first boss 32 have a relatively appropriate sum of dimensions in the axial direction Z. In this way, on the one hand, when the first boss 32 is used for welding, such as welding the tab or the adapter 4 of the electrode assembly 1, the welding mark formed by welding the first boss 32 does not extend to the outer terminal 311, so that the reliability of the battery monomer 10 can be improved. On the other hand, in the case where the axial dimension of the electrode terminal 3 is predetermined, the outer terminal 311 can have a relatively appropriate axial dimension, so that the outer terminal 311 and the external conductive part are connected.

[0185] In some embodiments, please refer to FIGS. 7-10, and combine 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 outer terminal 311 and a composite part 312. The material of the composite part 312 is different from that of the outer terminal 311, and is the same as that of the first boss 32. The outer terminal 311, the composite part 312 and the first boss 32 are sequentially distributed along the axial direction Z, and the composite part 312 covers the lead-out hole 201. The axial dimension of the outer terminal 311 ranges from 1.5mm to 2.5mm.

[0186] For ease of description, the axial dimension of the outer terminal 311 is set as a third dimension L3, and the third dimension L3 ranges from [1.5mm, 2.5mm], and 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.

[0187] In this way, the outer terminal 311 has a relatively appropriate axial dimension. In this way, on the one hand, the outer terminal 311 has a relatively large structural strength, so that the composite part 312 and the outer terminal 311 are easily combined. On the other hand, in the case where the outer terminal 311 and the external conductive part are welded, the welding mark formed by welding is located on the outer terminal 311, and does not extend to the composite part 312 and the first boss 32, so that the reliability of the battery monomer 10 can be improved.

[0188] In some embodiments, please refer to FIGS. 7-10, and combine with other drawings. The axial dimension of the outer terminal 311 ranges from 1.8mm to 2.2mm.

[0189] It can be understood that the third size L3 is in the range of [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.

[0190] In this way, the outer terminal 311 has a suitable axial size. In this way, on the one hand, the outer terminal 311 has a large structural strength, facilitating the bonding of the outer terminal 311 and the composite portion 312. On the other hand, in the case of welding the outer terminal 311 and the external conductive component, the welding formed on the outer terminal 311 will not extend to the composite portion 312 and the first boss 32, so that the reliability of the battery monomer 10 can be improved.

[0191] In some embodiments, please refer to FIGS. 4-6 and 11, and combine with other drawings. FIG. 11 is an enlarged view of E in FIG. 6. The electrode terminal 3 includes a positive electrode terminal 3a, and the axial size of the positive electrode terminal 3a is in the range of 2.5mm-4mm.

[0192] For ease of description, the axial size of the positive electrode terminal 3a is set as a fourth size L4.

[0193] The fourth size L4 is in the range of [2.5mm, 4mm], and specifically 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.

[0194] In this way, the positive electrode terminal 3a has a suitable size in the axial direction Z. In this way, on the one hand, the positive electrode terminal 3a can be welded with the external conductive component and the adapter 4 as much as possible without interference. On the other hand, the axial size of the positive electrode terminal 3a can be effectively reduced, so that the energy density of the battery monomer 10 can be ensured to a certain extent.

[0195] In some embodiments, please refer to FIG. 11, and combine with other drawings. The axial size of the positive electrode terminal 3a is in the range of 3mm-3.5mm.

[0196] It can be understood that the fourth size L4 is in the range of [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.

[0197] In this way, the positive electrode terminal 3a has a proper size in the axial direction Z. In this way, on the one hand, the positive electrode terminal 3a can be welded to the external conductive part and the adapter 4 respectively without interference as much as possible. On the other hand, the axial size of the positive electrode terminal 3a can be effectively reduced, so that the energy density of the battery monomer 10 can be ensured to a certain extent.

[0198] In some embodiments, referring to Fig. 7, and in combination with other figures. The battery monomer 10 can further include an upper plastic 7 and a fixing part 8. The upper plastic 7 is sleeved on the outer periphery of the terminal body 31, the fixing part 8 is sleeved on the outer periphery of the terminal body 31, and the upper plastic 7 is connected between the terminal body 31 and the fixing part 8 to isolate the fixing part 8 and the terminal body 31 from each other. The fixing part 8 is fixed on the shell 2 to arrange the electrode terminal 3 on the shell 2.

[0199] The fixing part 8 can be a metal part, which is fixed on the shell 2 by welding.

[0200] Referring to Fig. 2, and in combination with other figures. The battery 100 provided by the embodiments of the present application includes a battery monomer 10. In the embodiments, the battery monomer 10 is the same as the battery monomer 10 in the above embodiments, and the related description of the battery monomer 10 in the above embodiments is referred to.

[0201] The battery 100 provided by the embodiments of the present application can reduce the occupied space of the battery monomer 10 in the box 20 by using the battery monomer 10 related in the above embodiments, which helps to improve the space utilization of the box 20 and improve the energy density of the battery 100.

[0202] Referring to Fig. 1, the power consuming device provided by the embodiments of the present application includes a battery 100. In the embodiments, the battery 100 is the same as the battery 100 in the above embodiments, and the related description of the battery 100 in the above embodiments is referred to.

[0203] The power consuming device provided by the embodiments of the present application can improve the space utilization of the box 20 by using the battery 100 related in the above embodiments, which helps to improve the energy density of the battery 100 and thus improve the reliability of the device.

[0204] As one of the embodiments of the present application, as shown in FIGS. 3-11, 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 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. The first boss 32 is arranged at one end of the terminal body 31 close to the electrode assembly 1 in the axial direction Z and penetrates the lead-out hole 201. The insulating member 5 is arranged between the shell 2 and the electrode assembly 1 and is provided with an avoiding hole 501, which is communicated with the lead-out hole 201. In the axial direction Z, one end of the avoiding hole 501 close to the electrode assembly 1 is beyond the other end of the first boss 32 away from the terminal body 31 towards the electrode assembly 1. 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 arranged protruding towards the first boss 32 and abutting against the first boss 32. In the axial direction Z, one side of the second boss 42 close to the electrode assembly 1 is provided with a groove 401.

[0205] The above merely provides optional embodiments of the present application, but should not be used to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall fall within the scope of claims of the present application.

Claims

1. A battery cell, wherein, The battery cell comprises: a housing provided with a lead-out hole; an electrode assembly arranged in the housing; an electrode terminal comprising a terminal body and a first boss, 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 arranged in the lead-out hole and connected to the electrode assembly.

2. The battery cell of claim 1, wherein, The battery cell further comprises an adapter, the adapter comprises a body part and a second boss connected to the body part; the body part is arranged in the housing and connected to the electrode assembly; the second boss is arranged protruding towards the first boss along the axial direction and abuts against the first boss.

3. The battery cell of claim 2, wherein, Along the axial direction, the side of the second boss away from the first boss is provided with a groove.

4. The battery cell of any one of claims 1-3, wherein, The battery cell further comprises an insulating member arranged between the electrode assembly and the housing; along the axial direction, the insulating member is provided with a relief hole, the first boss is arranged in the relief hole or opposite to the relief hole; the relief hole is used for connecting the first boss to the electrode assembly.

5. The battery cell of claim 4, wherein, Along the axial direction, the end of the relief hole close to the electrode assembly protrudes towards the electrode assembly beyond the end of the first boss away from the terminal body.

6. The battery cell of claim 5, wherein, Along the axial direction, the distance between the end of the relief hole close to the electrode assembly and the end of the first boss away from the terminal body is a first distance, 0.5mm≤the first distance≤1.5mm.

7. The battery cell of claim 6, wherein, 0.8mm≤the first distance≤1.2mm.

8. The battery cell of any one of claims 1-7, wherein, The size of the first boss along the axial direction ranges from 0.3mm to 1.3mm.

9. The battery cell of claim 8, wherein, The size of the first boss along the axial direction ranges from 0.8mm to 1mm.

10. The battery cell of any one of claims 1-9, wherein, The battery cell further comprises a sealing ring, the sealing ring is arranged around the outer periphery of the first boss and abuts between the housing and the terminal body along the axial direction.

11. The battery cell of claim 10, wherein, The electrode terminal comprises a negative electrode terminal, the terminal body of the negative electrode terminal comprises an outer terminal and a composite part; the material of the composite part is different from that of the outer terminal and the same as that of the first boss; the outer terminal, the composite part and the first boss are sequentially arranged along the axial direction, the composite part covers the lead-out hole, and the sealing ring abuts between the housing and the composite part along the axial direction.

12. The battery cell of claim 11, wherein, The axial size of the composite part ranges from 0.1mm to 0.5mm.

13. The battery cell of claim 12, wherein, The axial size of the composite part ranges from 0.2mm to 0.4mm.

14. The battery cell of any one of claims 1-13, wherein, The electrode terminal comprises a negative electrode terminal, the terminal body of the negative electrode terminal comprises an outer terminal and a composite part; the material of the composite part is different from that of the outer terminal and the same as that of the first boss; the outer terminal, the composite part and the first boss are sequentially arranged along the axial direction, the composite part covers the lead-out hole; the sum of the axial sizes of the composite part and the first boss ranges from 1.0mm to 1.5mm.

15. The battery cell of claim 14, wherein, The sum of the axial sizes of the composite part and the first boss ranges from 1.2mm to 1.4mm.

16. The battery cell of any one of claims 1-15, wherein, The electrode terminal comprises a negative electrode terminal, the terminal body of the negative electrode terminal comprises an outer terminal and a composite part; the material of the composite part is different from that of the outer terminal and is the same as that of the first boss; the outer terminal, the composite part and the first boss are sequentially distributed along the axial direction, and the composite part covers the lead-out hole; the axial dimension of the outer terminal ranges from 1.5 mm to 2.5 mm.

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

18. The battery cell of any one of claims 1-17, wherein, The electrode terminal comprises 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 of claim 18, wherein, The axial dimension of the positive electrode terminal ranges from 3 mm to 3.5 mm.

20. A battery, wherein, The battery cell comprises the battery cell according to any one of claims 1-19.

21. An electrical device, comprising: The battery comprises the battery according to claim 20.

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