Battery cell, battery, and electrical apparatus

Abstract

A battery cell (20), a battery (100), and an electrical apparatus. The battery cell (20) comprises: a housing (23), the housing (23) comprising a first wall (21); an electrode assembly (22), provided with a tab; an electrode terminal (25), disposed on the first wall (21), the electrode terminal (25) being used to connect to a busbar (30) of the battery (100); and an adapter (24), the adapter (24) being used to connect the tab and the electrode terminal (25). The electrode terminal (25) is formed having a first weld pool area (40) and a second weld pool area (41), the first weld pool area (40) being used to connect to the busbar (30), the second weld pool area (41) being connected to the adapter (24). The first weld pool area (40) and the second weld pool area (41) are staggered along a direction perpendicular to the thickness direction of the first wall (21).

Description

Battery cells, batteries, and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202420283218.1 and application date of February 5, 2024, and claims the priority of the above-mentioned Chinese patent application. The entire content of the above-mentioned Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present application relates to the field of batteries, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0004] In the related art, one end of the electrode terminal is connected to the adapter plate, and the other end of the electrode terminal is connected to the connecting plate. In addition, the connection between the electrode terminal and the adapter plate and the connection between the electrode terminal and the connecting plate are directly opposite along the thickness direction of the electrode terminal. In order to ensure the connection quality between the electrode terminal and the adapter plate and the connecting plate, it is necessary to use a thick electrode terminal. However, the thick electrode terminal not only has a high production cost, but also occupies the installation space, thereby affecting the capacity of the battery cell.

[0005] Application Contents

[0006] The present application aims to solve one of the technical problems in the related art at least to a certain extent.

[0007] Therefore, one object of the present application is to provide a battery cell having an electrode terminal with a small thickness, which is beneficial to reducing the production cost of the battery cell and improving the capacity of the battery cell.

[0008] In a first aspect, an embodiment of the present application provides a battery cell, comprising:

[0009] A housing is provided with a receiving cavity, and the housing includes a first wall;

[0010] An electrode assembly is disposed in the accommodating cavity and is provided with a tab;

[0011] An electrode terminal is provided on the first wall, and the electrode terminal is used to connect to the busbar of the battery;

[0012] Adapter, which is used to connect the tab and the electrode terminal;

[0013] The electrode terminal is formed with a first molten pool area and a second molten pool area. The first molten pool area is used to connect with the bus bar, and the second molten pool area is connected with the adapter. The first molten pool area and the second molten pool area are staggered along a direction perpendicular to the thickness direction of the first wall.

[0014] In the above technical solution, by staggering the first molten pool area and the second molten pool area in a direction perpendicular to the thickness direction of the first wall, the thickness of the electrode terminal can be reduced without affecting the connection quality between the electrode terminal and the adapter and the busbar, thereby helping to reduce the production cost of the battery cell. In addition, reducing the thickness of the electrode terminal can reduce the installation space required for the electrode terminal, which is beneficial to increasing the capacity of the battery cell.

[0015] In a second aspect, an embodiment of the present application further provides a battery comprising a plurality of the above-mentioned battery cells and a bus bar, wherein the bus bar is used to connect the first molten pool areas of the plurality of battery cells.

[0016] In a third aspect, an embodiment of the present application further provides an electrical device comprising the above-mentioned battery cell, or comprising the above-mentioned battery.

[0017] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0019] FIG2 is an exploded view of the structure of a battery provided in some embodiments of the present application;

[0020] FIG3 is a schematic diagram of the connection between a battery cell and a busbar provided in some embodiments of the present application;

[0021] FIG4 is an exploded schematic diagram of a battery cell and a busbar provided in some embodiments of the present application;

[0022] FIG5 is a schematic diagram showing the connection between a battery cell and a busbar from another angle provided in some embodiments of the present application;

[0023] FIG6 is a cross-sectional view of a portion CC in FIG5 ;

[0024] FIG7 is an enlarged schematic diagram of point D in FIG6 (as an embodiment of the present application);

[0025] FIG8 is an enlarged schematic diagram of point D in FIG6 (as another embodiment of the present application);

[0026] FIG9 is an enlarged schematic diagram of point D in FIG6 (as another embodiment of the present application);

[0027] FIG10 is a schematic diagram of electrode terminals provided in some embodiments of the present application;

[0028] FIG11 is an exploded schematic diagram of an electrode terminal provided in some embodiments of the present application.

[0029] The reference numerals in the specification are as follows:

[0030] Vehicle 1000; Battery 100; Controller 200; Motor 300;

[0031] Box body 10; first box body 11; second box body 12; battery cell 20;

[0032] First wall 21; electrode assembly 22; housing 23; adapter 24; electrode terminal 25; accommodating cavity 26;

[0033] First terminal body 251; first body section 2511; second body section 2512; first welding area 2513; boss structure 2514; through-hole structure 2515;

[0034] Second terminal body 252; third body section 2521; fourth body section 2522; second welding area 2523; recessed structure 2524;

[0035] Negative electrode terminal 253; positive electrode terminal 254;

[0036] Busbar 30 ; first molten pool area 40 ; second molten pool area 41 . DETAILED DESCRIPTION

[0037] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0038] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0039] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0040] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0041] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0042] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0043] The term "plurality" used in this application refers to two or more (including two).

[0044] In this application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application do not limit this. Battery cells may be flat, rectangular, or in other shapes, and the embodiments of this application do not limit this. Battery cells are generally divided into square battery cells and soft-pack battery cells based on the packaging method, and the embodiments of this application do not limit this.

[0045] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or battery pack. A battery generally includes a casing that encloses one or more battery cells or multiple battery modules. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0046] A battery cell consists of a casing, an electrode assembly, and an electrolyte. The casing is used to hold the electrode assembly and electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet comprises a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive electrode collector. The uncoated positive electrode collector protrudes from the coated positive electrode collector, and the uncoated positive electrode collector serves as the positive electrode tab. For lithium-ion batteries, for example, the positive electrode current collector can be made of aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet comprises a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative electrode collector. The uncoated negative electrode collector protrudes from the coated negative electrode collector, and the uncoated negative electrode collector serves as the negative electrode tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that a large current can pass without melting, the positive electrode tabs are multiple and stacked together, and the negative electrode tabs are multiple and stacked together.

[0047] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a wound structure or a laminated structure, but the embodiments of the present application are not limited thereto.

[0048] New energy vehicles have experienced rapid growth in recent years. Within the electric vehicle sector, power batteries, as the power source, play an irreplaceable and important role. A battery consists of a housing and multiple cells housed within it. As a core component in new energy vehicles, batteries have high requirements for both reliability and cycle life.

[0049] The battery includes multiple battery cells, each of which includes an electrode terminal. One end of the electrode terminal is connected to the adapter plate, and the other end of the electrode terminal is connected to the connecting plate. In addition, the connection between the electrode terminal and the adapter plate, and the connection between the electrode terminal and the connecting plate are directly opposite along the thickness direction of the electrode terminal. In order to ensure the connection quality between the electrode terminal and the adapter plate and the connecting plate, it is necessary to use thick electrode terminals. However, thick electrode terminals not only have high production costs, but also occupy installation space, thereby affecting the capacity of the battery cell.

[0050] Based on the above considerations, in order to solve the technical problem that thick electrode terminals lead to high cost of battery cells and affect the capacity of battery cells, the present application proposes a battery cell, comprising: a housing, provided with a receiving cavity, the housing comprising a first wall; an electrode assembly, the electrode assembly being disposed in the receiving cavity and provided with a tab; an electrode terminal, disposed on the first wall, the electrode terminal being used to connect to a battery bus; an adapter, the adapter being used to connect the tab and the electrode terminal; the electrode terminal being formed with a first molten pool area and a second molten pool area, the first molten pool area being used to connect to the bus, the second molten pool area being connected to the adapter, the first molten pool area and the second molten pool area being staggered along a direction perpendicular to the thickness direction of the first wall.

[0051] In such a battery cell, by staggering the first molten pool area and the second molten pool area in a direction perpendicular to the thickness direction of the first wall, the thickness of the electrode terminal can be reduced without affecting the connection quality between the electrode terminal and the adapter and the busbar, thereby helping to reduce the production cost of the battery cell. In addition, reducing the thickness of the electrode terminal can reduce the installation space required for the electrode terminal, which is beneficial to increasing the capacity of the battery cell.

[0052] The battery disclosed in the embodiments of the present application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. The battery disclosed in the present application can be used to form a power supply system for the electrical device.

[0053] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0054] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0055] Please refer to Figure 1, which is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail 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 may 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, for starting, navigating and driving the vehicle 1000.

[0056] In some embodiments of the present application, 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.

[0057] Please refer to Figure 2, which is an exploded view of the structure of a battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 10 and a plurality of battery cells 20, which are intended to be accommodated within the housing 10. The housing 10 is used to provide an assembly space for the battery cells 20, and the housing 10 can adopt a variety of structures. In some embodiments, the housing 10 can include a first housing body 11 and a second housing body 12, which cover each other and together define an assembly space for accommodating the battery cells 20. The second housing body 12 can be a hollow structure with one end open, and the first housing body 11 can be a plate-like structure, with the first housing body 11 covering the open side of the second housing body 12, so that the first housing body 11 and the second housing body 12 jointly define an assembly space. The first housing body 11 and the second housing body 12 can also be hollow structures with one end open, with the open side of the first housing body 11 covering the open side of the second housing body 12. Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cube, a rectangular parallelepiped, etc.

[0058] In the battery 100, the multiple battery cells 20 can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire structure of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery 100 can be constructed by first connecting the multiple battery cells 20 in series, in parallel, or in a hybrid configuration to form a battery module, which is then connected in series, in parallel, or in a hybrid configuration to form a single structure and housed within the housing 10. The battery 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0059] Each battery cell 20 may be a secondary battery or a primary battery, and may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be flat, rectangular, or in other shapes.

[0060] The battery cell 20 according to an embodiment of the present application will be described below with reference to FIG. 3 to FIG. 11 .

[0061] 3 to 11 , the battery cell 20 according to an embodiment of the present application includes:

[0062] The housing 23 is provided with a receiving cavity 26 , and the housing 23 includes a first wall 21 ;

[0063] The electrode assembly 22 is disposed in the accommodating cavity 26 and is provided with a tab;

[0064] The electrode terminal 25 is provided on the first wall 21 and is used to connect to the busbar 30 of the battery 100;

[0065] Adapter 24, adapter 24 is used to connect the tab and the electrode terminal 25;

[0066] The electrode terminal 25 is formed with a first molten pool area 40 and a second molten pool area 41 . The first molten pool area 40 is used to connect to the busbar 30 , and the second molten pool area 41 is connected to the adapter 24 . The first molten pool area 40 and the second molten pool area 41 are staggered along a direction perpendicular to the thickness direction of the first wall 21 .

[0067] 3 and 4 , the outer shell 23 is provided with a housing cavity 26 , and the outer shell 23 includes a first wall 21 , the electrode assembly 22 is provided with a tab, the electrode assembly 22 is arranged in the housing cavity 26 , the electrode terminal 25 is arranged on the first wall 21 , and the electrode terminal 25 can be connected to the bus 30 of the battery 100 , and the adapter 24 is used to connect the tab and the electrode terminal 25 , that is, the adapter 24 can be connected to the tab, and the electrode terminal 25 can be connected to the adapter 24 .

[0068] As some embodiments of the present application, the busbar 30 can be connected between two battery cells 20, for example, the busbar 30 can be connected between the electrode terminals 25 of the two battery cells 20, or the busbar 30 can be connected between the electrode terminals 25 of the battery cell 20 and other components, for example, the busbar 30 can be connected between the electrode terminals 25 of the battery cell 20 and the distributor.

[0069] The electrode terminal 25 is formed with a first molten pool area 40 and a second molten pool area 41, wherein the first molten pool area 40 is used to connect to the busbar 30, and the second molten pool area 41 is used to connect to the adapter 24. The first molten pool area 40 can be understood as a physical structure formed by cooling and solidifying the molten pool formed by melting part of the physical structure of the electrode terminal 25 and part of the physical structure of the busbar 30 through the welding process. Depending on the process, the first molten pool area 40 may include some fillers (such as but not limited to welding rods). The second molten pool area 41 can be understood as a physical structure formed by cooling and solidifying the molten pool formed by melting part of the physical structure of the electrode terminal 25 and part of the physical structure of the adapter 24 through the welding process. Depending on the process, the second molten pool area 41 may include some fillers (such as but not limited to welding rods).

[0070] The first molten pool region 40 and the second molten pool region 41 are staggered along a direction perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in FIG7 ). The direction perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in FIG7 ) can be understood as setting a plane perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in FIG7 ). In other words, the thickness direction of the first wall 21 (i.e., the Z direction shown in FIG7 ) is parallel to the normal of this plane, and the first molten pool region 40 and the second molten pool region 41 are staggered along a direction parallel to this plane.

[0071] The first weld zone 2513 and the second weld zone 2523 are staggered along a direction perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in FIG7 ). This can be understood as setting a plane perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in FIG7 ), such that along the thickness direction of the first wall 21 (i.e., the Z direction shown in FIG7 ), the orthographic projection of the first molten pool zone 40 on the plane partially overlaps with the orthographic projection of the second molten pool zone 41 on the plane. In other words, a portion of the orthographic projection of the first molten pool zone 40 on the plane overlaps with the orthographic projection of the second molten pool zone 41 on the plane, while another portion of the orthographic projection of the first molten pool zone 40 on the plane does not overlap with the orthographic projection of the second molten pool zone 41 on the plane. Alternatively, along the thickness direction of the first wall 21 (i.e., the Z direction shown in FIG7 ), the orthographic projection of the first molten pool zone 40 on the plane does not overlap with the orthographic projection of the second molten pool zone 41 on the plane. In other words, the orthographic projection of the first molten pool zone 40 on the plane does not overlap with the orthographic projection of the second molten pool zone 41 on the plane.

[0072] It needs to be explained that if the first molten pool area 40 and the second molten pool area 41 are facing each other in a direction perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in Figure 7), in order not to affect the connection quality between the electrode terminal 25 and the adapter 24 and the bus 30, it is necessary to increase the thickness of the electrode terminal 25 to increase the heat transfer path between the first molten pool area 40 and the second molten pool area 41. The electrode terminal 25 with a large thickness not only has a high production cost, but also occupies the installation space, thereby affecting the capacity of the battery cell 20.

[0073] By staggering the first molten pool region 40 and the second molten pool region 41 in a direction perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in FIG7 ), the effect of heat generated during welding of the electrode terminal 25 and the busbar 30 on the connection between the electrode terminal 25 and the adapter 24 can be reduced compared to the prior art. Alternatively, the effect of heat generated during welding of the electrode terminal 25 and the adapter 24 on the connection between the electrode terminal 25 and the busbar 30 can be reduced. This can be understood as follows: because the first molten pool region 40 and the second molten pool region 41 are staggered in a direction perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in FIG7 ), the distance heat is transferred from one location to the other during welding is increased. In other words, the heat transfer path between the first molten pool region 40 and the second molten pool region 41 is increased. Therefore, this arrangement can reduce the thickness of the electrode terminal 25 without affecting the connection quality between the electrode terminal 25 and the adapter 24 and the busbar 30.

[0074] For example, assuming that the first molten pool area 40 and the second molten pool area 41 are not staggered in a direction perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in Figure 7), in order to ensure the connection quality, the thickness of an electrode terminal 25 needs to be set to 10 mm, that is, the heat transfer path between the first molten pool area 40 and the second molten pool area 41 is 10 mm. By staggering the first molten pool area 40 and the second molten pool area 41 in a direction perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in Figure 7), the thickness of the electrode terminal 25 can be set to less than 10 mm while ensuring that the heat transfer path between the first molten pool area 40 and the second molten pool area 41 is 10 mm.

[0075] Therefore, by staggering the first molten pool area 40 and the second molten pool area 41 in a direction perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in Figure 7), the thickness of the electrode terminal 25 can be reduced without affecting the connection quality between the electrode terminal 25 and the adapter 24 and the busbar 30. Reducing the thickness of the electrode terminal 25 can reduce the production cost of the battery cell 20. In addition, reducing the thickness of the electrode terminal 25 can reduce the space occupied by the electrode terminal 25 (i.e., reducing the thickness of the electrode terminal 25 can reduce the installation space required for the electrode terminal 25), thereby leaving more space for arranging the electrode assembly 22 of the battery cell 20, thereby increasing the capacity of the battery cell 20.

[0076] In the above technical solution, by staggering the first molten pool area 40 and the second molten pool area 41 in a direction perpendicular to the thickness direction of the first wall 21, the thickness of the electrode terminal 25 can be reduced without affecting the connection quality between the electrode terminal 25 and the adapter 24 and the busbar 30, thereby helping to reduce the production cost of the battery cell 20. In addition, reducing the thickness of the electrode terminal 25 can reduce the installation space required for the electrode terminal 25, which is beneficial to increasing the capacity of the battery cell 20.

[0077] According to some embodiments of the present application, along the thickness direction of the first wall 21 , the orthographic projection of the first molten pool area 40 and the orthographic projection of the second molten pool area 41 are completely offset.

[0078] It can be understood that a plane is set, which is perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in Figure 7). Along the thickness direction of the first wall 21 (i.e., the Z direction shown in Figure 7), the orthographic projection of the first molten pool area 40 on the plane does not overlap with the orthographic projection of the second molten pool area 41 on the plane, that is, the orthographic projection of the first molten pool area 40 on the plane and the orthographic projection of the second molten pool area 41 on the plane do not have any overlapping parts.

[0079] In the above technical solution, by completely staggering the orthographic projection of the first molten pool area 40 and the orthographic projection of the second molten pool area 41, the thickness of the electrode terminal 25 can be further reduced without affecting the connection quality between the electrode terminal 25 and the adapter 24 and the busbar 30, which is beneficial to further reduce the production cost of the battery cell 20.

[0080] As some embodiments of the present application, the electrode terminal 25 can be constructed as an integral piece, that is, the electrode terminal 25 is formed in one piece, and the material of the electrode terminal 25 can be sodium, which helps to reduce the difficulty of producing the electrode terminal 25.

[0081] According to some embodiments of the present application, as shown in Figures 7 to 11, the electrode terminal 25 includes a first terminal body 251 and a second terminal body 252 stacked along the thickness direction of the first wall 21. The first terminal body 251 is located on a side of the second terminal body 252 away from the accommodating cavity 26. The surface of the first terminal body 251 has a first welding area 2513 corresponding to the first molten pool area 40, and the surface of the second terminal body 252 has a second welding area 2523 corresponding to the second molten pool area 41. The first welding area 2513 and the second welding area 2523 are staggered along a direction perpendicular to the thickness direction of the first wall 21.

[0082] The first terminal body 251 has a first body section 2511 and a second body section 2512 that are connected. The first body section 2511 and the second body section 2512 are arranged in a direction perpendicular to the thickness direction of the first wall 21. A first welding area 2513 is formed on the surface of the first body section 2511. Along the thickness direction of the first wall 21, the thickness of the first body section 2511 is greater than the thickness of the second body section 2512.

[0083] The electrode terminal 25 includes a first terminal body 251 and a second terminal body 252 , which are stacked along the thickness direction of the first wall 21 (ie, the Z direction shown in FIG. 7 ).

[0084] As some embodiments of the present application, the first terminal body 251 and the second terminal body 252 are an integral piece, that is, the first terminal body 251 and the second terminal body 252 are integrally formed, and the first terminal body 251 and the second terminal body 252 are both sodium.

[0085] As some embodiments of the present application, the first terminal body 251 and the second terminal body 252 are stacked, and the materials of the first terminal body 251 and the second terminal body 252 can be different. For example, the material of the first terminal body 251 can be aluminum (that is, the first terminal body 251 can be constructed as an aluminum part), and the material of the second terminal body 252 can be copper (that is, the second terminal body 252 can be constructed as a copper part), or, the material of the first terminal body 251 can be aluminum (that is, the first terminal body 251 can be constructed as an aluminum part), and the material of the second terminal body 252 can be nickel (that is, the second terminal body 252 can be constructed as a nickel part). By making the materials of the first terminal body 251 and the second terminal body 252 different, it can adapt to the materials of the adapter 24 and the bus 30, which is beneficial to improving the connection stability between the electrode terminal 25 and the adapter 24 and the bus 30.

[0086] As some embodiments of the present application, the first terminal body 251 and the second terminal body 252 are stacked, and the materials of the first terminal body 251 and the second terminal body 252 can be the same. For example, the materials of the first terminal body 251 and the second terminal body 252 can both be sodium, which is conducive to reducing the production difficulty of the electrode terminal 25.

[0087] The first terminal body 251 is located on a side of the second terminal body 252 away from the accommodating cavity 26. The surface of the first terminal body 251 has a first welding zone 2513, which corresponds to the first molten pool area 40. In some embodiments of the present application, the first welding zone 2513 is connected to the first molten pool area 40. The surface of the second terminal body 252 has a second welding zone 2523, which corresponds to the second molten pool area 41. In some embodiments of the present application, the second welding zone 2523 can be connected to the second molten pool area 41.

[0088] Regarding the first welding zone 2513 and the second welding zone 2523 being staggered in a direction perpendicular to the thickness direction of the first wall 21, it can be understood that a plane is set, which is perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in FIG7 ), and along the thickness direction of the first wall 21 (i.e., the Z direction shown in FIG7 ), the orthographic projection of the first welding zone 2513 on the plane partially overlaps with the orthographic projection of the second welding zone 2523 on the plane, that is, a part of the orthographic projection of the first welding zone 2513 on the plane overlaps with the orthographic projection of the second welding zone 2523 on the plane. The orthographic projection of zone 2523 on the plane overlaps, and another part of the orthographic projection of the first welding zone 2513 on the plane does not overlap with the orthographic projection of the second welding zone 2523 on the plane, or, along the thickness direction of the first wall 21 (i.e., the Z direction shown in Figure 7), the orthographic projection of the first welding zone 2513 on the plane does not overlap with the orthographic projection of the second welding zone 2523 on the plane, that is, the orthographic projection of the first welding zone 2513 on the plane does not have any overlapping part with the orthographic projection of the second welding zone 2523 on the plane.

[0089] It should be explained that after the electrode terminal 25 is welded to the busbar 30, a first molten pool region 40 is formed on the electrode terminal 25. The first molten pool region 40 is connected between the first terminal body 251 and the busbar 30. The first weld region 2513 can be understood as the region where the first terminal body 251 and the first molten pool region 40 are connected. After the electrode terminal 25 is welded to the adapter 24, a second molten pool region 41 is formed on the electrode terminal 25. The second molten pool region 41 is connected between the second terminal body 252 and the adapter 24. The second weld region 2523 can be understood as the region where the second terminal body 252 and the second molten pool region 41 are connected.

[0090] As shown in Figures 7-11, the first terminal body 251 includes a first body section 2511 and a second body section 2512. The first and second body sections 2511, 2512 are connected and arranged. In some embodiments of the present application, the first and second body sections 2511, 2512 may be integrally formed, i.e., they may be constructed as a single piece. The first and second body sections 2511, 2512 are arranged perpendicular to the thickness of the first wall 21 (i.e., the Z direction shown in Figure 7). In some embodiments of the present application, as shown in Figure 8, the first body section 2511 may be sleeved around the second body section 2512, or, as shown in Figure 7, the second body section 2512 may be sleeved around the first body section 2511. A first weld zone 2513 may be formed on the surface of the first body section 2511. Along the thickness of the first wall 21 (i.e., the Z direction shown in Figure 7), the first body section 2511 is thicker than the second body section 2512.

[0091] In the above technical solution, by having the electrode terminal 25 include a first terminal body 251 and a second terminal body 252 stacked along the thickness direction of the first wall 21, the electrode terminal 25 can be manufactured from the same material or different materials as needed, adapting to the materials of the adapter 24 and the busbar 30, thereby improving the connection stability between the electrode terminal 25 and the adapter 24 and the busbar 30. In addition, the surfaces of the first terminal body 251 and the second terminal body 252 are provided with a first weld zone 2513 and a second weld zone 2523, respectively, which facilitates the connection of the electrode terminal 25 to the adapter 24 and the busbar 30.

[0092] By making the first terminal body 251 have a first body section 2511 and a second body section 2512 that are connected and have different thicknesses, and forming a first welding zone 2513 in the first body section 2511 with a relatively large thickness, sufficient melting depth can be provided for the connection between the first body section 2511 and the bus bar 30, and the connection reliability of the first body section 2511 and the bus bar 30 can be improved. Moreover, by forming the first welding zone 2513 in the first body section 2511 with a relatively large thickness, the influence of the connection process of the first body section 2511 and the bus bar 30 on the connection between the second terminal body 252 and the adapter 24 can be reduced, which is beneficial to ensuring the connection reliability of the second terminal body 252 and the adapter 24.

[0093] According to some embodiments of the present application, as shown in Figures 7 to 11, the second terminal body 252 has a third body segment 2521 and a fourth body segment 2522 that are connected. The third body segment 2521 and the fourth body segment 2522 are arranged in a direction perpendicular to the thickness direction. A second welding zone 2523 is formed on the surface of the third body segment 2521. Along the thickness direction of the first wall 21, the thickness of the third body segment 2521 is greater than the thickness of the fourth body segment 2522.

[0094] The third body segment 2521 and the fourth body segment 2522 are connected. In some embodiments of the present application, the third body segment 2521 and the fourth body segment 2522 can be integrally formed, that is, the third body segment 2521 and the fourth body segment 2522 can be constructed as a single piece. The third body segment 2521 and the fourth body segment 2522 are arranged in a direction perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in FIG. 7 ). In some embodiments of the present application, as shown in FIG. 7 , the third body segment 2521 can be sleeved on the outside of the fourth body segment 2522, or as shown in FIG. 8 , the fourth body segment 2522 can be sleeved on the outside of the third body segment 2521.

[0095] A second welding zone 2523 may be formed on the surface of the third body segment 2521 . Along the thickness direction of the first wall 21 (ie, the Z direction shown in FIG. 7 ), the thickness of the third body segment 2521 is greater than that of the fourth body segment 2522 .

[0096] In the above technical solution, by making the second terminal body 252 have a third body segment 2521 and a fourth body segment 2522 that are connected and have different thicknesses, and making the third body segment 2521 with a relatively larger thickness form a second welding zone 2523, sufficient welding depth can be provided for the connection between the third body segment 2521 and the adapter 24, which can improve the connection reliability of the third body segment 2521 and the adapter 24.

[0097] According to some embodiments of the present application, as shown in FIG. 7 , the thickness of the fourth body segment 2522 is greater than or equal to 0.1 mm.

[0098] In some embodiments of the present application, as shown in FIG7 , the thickness of the fourth body segment 2522 along the thickness direction of the first wall 21 (i.e., the Z direction shown in FIG7 ) may be H, where H may be any value greater than or equal to 0.1 mm. For example, the thickness of the fourth body segment 2522 may be, but is not limited to, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, etc. In some optional embodiments of the present application, the thickness of the fourth body segment 2522 along the thickness direction of the first wall 21 (i.e., the Z direction shown in FIG7 ) may be a maximum of 3 mm. In other words, the thickness H of the fourth body segment 2522 may satisfy the relationship: 0.1 mm ≤ H ≤ 3 mm. For example, the thickness of the fourth body segment 2522 may be, but is not limited to, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, etc.

[0099] In the above technical solution, by making the thickness of the fourth body segment 2522 greater than or equal to 0.1 mm, the probability of the surface of the first terminal body 251 close to the second terminal body 252 being exposed can be reduced. It should be explained that if the surface of the first terminal body 251 close to the second terminal body 252 is exposed, the exposed part will be corroded after contacting the electrolyte of the battery cell 20. Therefore, by making the thickness of the fourth body segment 2522 greater than or equal to 0.1 mm, it is beneficial to improve the reliability of the electrode terminal 25.

[0100] According to some embodiments of the present application, as shown in Figures 8 and 9, along a direction perpendicular to the thickness direction of the first wall 21, the second welding zone 2523 is located in the middle of the second terminal body 252, and the first welding zone 2513 is located on the outside of the second welding zone 2523.

[0101] In which, a plane is set, which is perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in Figure 7). Along the thickness direction of the first wall 21 (i.e., the Z direction shown in Figure 7), the second welding zone 2523, the second terminal body 252, and the first welding zone 2513 all have orthographic projections on the plane. Along the direction perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in Figure 7), the orthographic projection of the second welding zone 2523 on the plane is located in the middle position of the orthographic projection of the second terminal body 252 on the plane, and the orthographic projection of the first welding zone 2513 on the plane is located outside the orthographic projection of the second welding zone 2523 on the plane.

[0102] As shown in FIG8 , in some embodiments of the present application, the second terminal body 252 may include a third body segment 2521 and a fourth body segment 2522. The fourth body segment 2522 may be sleeved around the third body segment 2521. The third body segment 2521 may be thicker than the fourth body segment 2522. The third body segment 2521 may be formed with a second weld zone 2523. The first terminal body 251 may include a first body segment 2511 and a second body segment 2512. The first body segment 2511 may be sleeved around the second body segment 2512. The first body segment 2511 may be thicker than the second body segment 2512. The first body segment 2511 may be formed with a first weld zone 2513. Furthermore, along a direction perpendicular to the thickness of the first wall 21 (i.e., the Z direction shown in FIG7 ), the second weld zone 2523 is located in the middle of the second terminal body 252, and the first weld zone 2513 is located outside the second weld zone 2523.

[0103] In the above technical solution, by locating the second welding zone 2523 in the middle of the second terminal body 252 and the first welding zone 2513 on the outside of the second welding zone 2523, the second welding zone 2523 and the first welding zone 2513 can be reasonably positioned, and the first welding zone 2513 and the second welding zone 2523 can be staggered in a direction perpendicular to the thickness direction of the first wall 21, thereby reducing the thickness of the electrode terminal 25, which is beneficial to reducing the production cost of the battery cell 20 and increasing the capacity of the battery cell 20.

[0104] According to some embodiments of the present application, along the thickness direction of the first wall 21 , the orthographic projection of the first welding zone 2513 is arranged around the orthographic projection of the second welding zone 2523 .

[0105] A plane is set, which is perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in Figure 7). Along the thickness direction of the first wall 21 (i.e., the Z direction shown in Figure 7), the second welding zone 2523 and the first welding zone 2513 both have positive projections on the plane, and the positive projection of the first welding zone 2513 can surround the positive projection of the second welding zone 2523.

[0106] In some embodiments of the present application, the number of first weld zones 2513 may be multiple. For example, the number of first weld zones 2513 may be, but is not limited to, two, three, or four. The orthographic projections of the multiple first weld zones 2513 on the plane may surround the orthographic projection of the second weld zone 2523 on the plane. In some embodiments of the present application, the number of first weld zones 2513 may be one. The orthographic projection of the first weld zone 2513 on the plane may be annular. The annular shape may be understood as, but is not limited to, a circular ring, a polygon, etc. The annular shape may be a closed ring or a ring with a gap. The annular orthographic projection of the first weld zone 2513 on the plane may surround the orthographic projection of the second weld zone 2523 on the plane. In some embodiments of the present application, the number of second weld zones 2523 may be one or more. For example, the number of second weld zones 2523 may be, but is not limited to, one, two, three, or four.

[0107] In the above technical solution, by making the orthographic projection of the first welding zone 2513 surround the orthographic projection of the second welding zone 2523, the setting positions of the second welding zone 2523 and the first welding zone 2513 can be reasonably set, and the first welding zone 2513 and the second welding zone 2523 can be staggered in a direction perpendicular to the thickness direction of the first wall 21, so that the thickness of the electrode terminal 25 can be reduced, which is beneficial to reducing the production cost of the battery cell 20 and is beneficial to increasing the capacity of the battery cell 20. Moreover, such a setting can facilitate the connection of the electrode terminal 25 with the adapter 24 and the bus 30, which is beneficial to reducing the manufacturing difficulty of the battery cell 20 and reducing the difficulty of connecting the battery cell 20 with the bus 30.

[0108] According to some embodiments of the present application, the second welding zone 2523 is constructed in a straight line, and there are two first welding zones 2513 . The two first welding zones 2513 are located on opposite sides of the second welding zone 2523 along a direction perpendicular to the thickness direction of the first wall 21 .

[0109] A plane is set, which is perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in Figure 7). Along the thickness direction of the first wall 21 (i.e., the Z direction shown in Figure 7), the second welding zone 2523 and the two first welding zones 2513 have positive projections on the plane, and the positive projections of the two first welding zones 2513 on the plane are located on opposite sides of the positive projection of the second welding zone 2523 on the plane. For example, the positive projections of the two first welding zones 2513 on the plane are respectively located on the upper and lower sides of the positive projection of the second welding zone 2523 on the plane, or, the positive projections of the two first welding zones 2513 on the plane are respectively located on the left and right sides of the positive projection of the second welding zone 2523 on the plane.

[0110] In some embodiments of the present application, the orthographic projection of the second weld zone 2523 on the plane can be a straight line. A straight line can be understood as, but not limited to, a rectangle extending in a certain direction with a large aspect ratio, an ellipse extending in a certain direction with a large ratio of the major axis to the minor axis, etc. In some embodiments of the present application, the orthographic projection of at least one of the two first weld zones 2513 on the plane can be, but not limited to, an arc, a semicircle, etc.

[0111] In the above technical solution, by constructing the second welding zone 2523 into a straight line and locating the two first welding zones 2513 on opposite sides of the second welding zone 2523, the shape of the second welding zone 2523 can be made reasonable, and the setting positions of the second welding zone 2523 and the first welding zone 2513 can be made reasonable, thereby effectively reducing the impact of the connection between the electrode terminal 25 and one of the adapter 24 and the bus 30 when welding. In addition, such a setting can reduce the thickness of the electrode terminal 25, which is beneficial to reducing the production cost of the battery cell 20 and improving the capacity of the battery cell 20.

[0112] According to some embodiments of the present application, as shown in FIG. 7 , along a direction perpendicular to the thickness direction of the first wall 21 , the first welding zone 2513 is located in the middle of the first terminal body 251 , and the second welding zone 2523 is located outside the first welding zone 2513 .

[0113] In which, a plane is set, which is perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in Figure 7). Along the thickness direction of the first wall 21 (i.e., the Z direction shown in Figure 7), the second welding zone 2523, the first terminal body 251, and the first welding zone 2513 all have positive projections on the plane. Along the direction perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in Figure 7), the positive projection of the first welding zone 2513 on the plane is located in the middle position of the positive projection of the first terminal body 251 on the plane, and the positive projection of the second welding zone 2523 on the plane is located outside the positive projection of the first welding zone 2513 on the plane.

[0114] As shown in FIG7 , in some embodiments of the present application, a first terminal body 251 may include a first body section 2511 and a second body section 2512. The second body section 2512 may be sleeved around the first body section 2511. The first body section 2511 may be thicker than the second body section 2512, and the first body section 2511 may be formed with a first weld zone 2513. The second terminal body 252 may include a third body section 2521 and a fourth body section 2522. The third body section 2521 may be sleeved around the fourth body section 2522. The third body section 2521 may be thicker than the fourth body section 2522, and the third body section 2521 may be formed with a second weld zone 2523. Furthermore, in a direction perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in FIG7 ), the first weld zone 2513 is located in the middle of the first terminal body 251, and the second weld zone 2523 is located outside the first weld zone 2513.

[0115] In the above technical solution, by locating the first welding zone 2513 in the middle of the first terminal body 251 and the second welding zone 2523 on the outside of the first welding zone 2513, the second welding zone 2523 and the first welding zone 2513 can be reasonably positioned, and the first welding zone 2513 and the second welding zone 2523 can be staggered in a direction perpendicular to the thickness direction of the first wall 21, thereby reducing the thickness of the electrode terminal 25, which is beneficial to reducing the production cost of the battery cell 20 and increasing the capacity of the battery cell 20.

[0116] According to some embodiments of the present application, along the thickness direction of the first wall 21 , the orthographic projection of the second welding zone 2523 is arranged around the orthographic projection of the first welding zone 2513 .

[0117] A plane is defined, which is perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in FIG7 ). Along the thickness direction of the first wall 21 (i.e., the Z direction shown in FIG7 ), the second weld zone 2523 and the first weld zone 2513 both have orthographic projections on the plane, and the orthographic projection of the second weld zone 2523 can surround the orthographic projection of the first weld zone 2513. In some embodiments of the present application, the number of second weld zones 2523 can be multiple, for example, the number of second weld zones 2523 can be, but is not limited to, two, three, four, etc., and the orthographic projections of the multiple second weld zones 2523 on the plane can surround the orthographic projection of the first weld zone 2513 on the plane. In some embodiments of the present application, the number of second weld zones 2523 may be one, and the orthographic projection of the second weld zone 2523 on the plane may be annular. The annular shape may be understood as, but not limited to, a circular ring, a polygon, etc., and may be a closed ring or a ring with a gap. The annular orthographic projection of the second weld zone 2523 on the plane may surround the orthographic projection of the first weld zone 2513 on the plane. In some embodiments of the present application, the number of first weld zones 2513 may be one or more, for example, the number of first weld zones 2513 may be, but not limited to, one, two, three, four, etc.

[0118] In the above technical solution, by making the orthographic projection of the second welding zone 2523 surround the orthographic projection of the first welding zone 2513, the setting positions of the second welding zone 2523 and the first welding zone 2513 can be reasonably set, and the first welding zone 2513 and the second welding zone 2523 can be staggered in a direction perpendicular to the thickness direction of the first wall 21, so that the thickness of the electrode terminal 25 can be reduced, which is beneficial to reducing the production cost of the battery cell 20 and is beneficial to increasing the capacity of the battery cell 20. Moreover, such a setting can facilitate the connection of the electrode terminal 25 with the adapter 24 and the bus 30, which is beneficial to reducing the manufacturing difficulty of the battery cell 20 and reducing the difficulty of connecting the battery cell 20 with the bus 30.

[0119] According to some embodiments of the present application, as shown in Figures 7 to 9, the surface of the first terminal body 251 facing away from the second terminal body 252 has a first welding area 2513, and the surface of the second terminal body 252 facing away from the first terminal body 251 has a second welding area 2523.

[0120] In some embodiments of the present application, along the thickness direction of the first wall 21 (i.e., the Z direction shown in FIG7 ), the busbar 30, the electrode terminal 25, and the adapter 24 can be arranged in sequence. Specifically, the busbar 30, the first terminal body 251, the second terminal body 252, and the adapter 24 can be arranged in sequence. The surface of the first terminal body 251 facing away from the second terminal body 252 can have a first weld zone 2513 (i.e., the upper surface of the first terminal body 251 can have the first weld zone 2513, i.e., the surface of the first terminal body 251 facing the busbar 30 can have the first weld zone 2513). The first weld zone 2513 corresponds to the first molten pool area 40. The surface of the second terminal body 252 facing away from the first terminal body 251 may have a second welding zone 2523 (i.e., the lower surface of the second terminal body 252 may have a second welding zone 2523, i.e., the surface of the second terminal body 252 facing the adapter 24 may have a second welding zone 2523), and the second welding zone 2523 corresponds to the second molten pool zone 41.

[0121] As some embodiments of the present application, the first terminal body 251 may have a connected first body segment 2511 and a second body segment 2512. The first body segment 2511 and the second body segment 2512 may be arranged along a direction perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in Figure 7). Along the thickness direction of the first wall 21 (i.e., the Z direction shown in Figure 7), the thickness of the first body segment 2511 may be greater than the thickness of the second body segment 2512, and the surface of the first body segment 2511 facing away from the second terminal body 252 may have a first welding zone 2513.

[0122] The second terminal body 252 may have a third body segment 2521 and a fourth body segment 2522 connected to each other. The third body segment 2521 and the fourth body segment 2522 may be arranged along a direction perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in FIG7 ). Along the thickness direction of the first wall 21 (i.e., the Z direction shown in FIG7 ), the thickness of the third body segment 2521 may be greater than the thickness of the fourth body segment 2522. In addition, the surface of the third body segment 2521 facing away from the first terminal body 251 may have a second welding zone 2523. In addition, the first welding zone 2513 and the second welding zone 2523 are staggered along a direction perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in FIG7 ).

[0123] In the above technical solution, by making the surface of the first terminal body 251 facing away from the second terminal body 252 have a first welding zone 2513, and making the surface of the second terminal body 252 facing away from the first terminal body 251 have a second welding zone 2523, the setting positions of the first welding zone 2513 and the second welding zone 2523 can be reasonably arranged, which can facilitate the connection between the electrode terminal 25 and the adapter 24 and the bus 30, which is beneficial to reducing the manufacturing difficulty of the battery cell 20 and improving the connection efficiency between the battery cell 20 and the bus 30, thereby helping to improve the production rhythm.

[0124] As some embodiments of the present application, the side of the first terminal body 251 may have a first welding zone 2513, the first welding zone 2513 corresponds to the first molten pool zone 40, and there is an angle between the side of the first terminal body 251 and the surface of the first terminal body 251 facing away from the second terminal body 252. As some embodiments of the present application, the side of the first terminal body 251 is perpendicular to the surface of the first terminal body 251 facing away from the second terminal body 252.

[0125] As some embodiments of the present application, the side of the first terminal body 251 may have a portion of the first welding zone 2513, and the surface of the first terminal body 251 facing away from the second terminal body 252 may have another portion of the first welding zone 2513, and the first welding zone 2513 corresponds to the first molten pool zone 40.

[0126] Such an arrangement can facilitate the connection of the electrode terminal 25 to the busbar 30 through the first molten pool area 40 , which is beneficial to improving the connection efficiency between the battery cell 20 and the busbar 30 , thereby facilitating an improvement in production cycle time.

[0127] As some embodiments of the present application, the side of the second terminal body 252 may have a second welding zone 2523, the second welding zone 2523 corresponds to the second molten pool zone 41, and there is an angle between the side of the second terminal body 252 and the surface of the second terminal body 252 facing away from the first terminal body 251. As some embodiments of the present application, the side of the second terminal body 252 is perpendicular to the surface of the second terminal body 252 facing away from the first terminal body 251.

[0128] As some embodiments of the present application, the side surface of the second terminal body 252 may have a portion of the second welding zone 2523, and the surface of the second terminal body 252 facing away from the first terminal body 251 may have another portion of the second welding zone 2523, and the second welding zone 2523 corresponds to the second molten pool zone 41.

[0129] Such an arrangement can facilitate the connection of the electrode terminal 25 to the adapter 24 through the second molten pool area 41 , which is beneficial to improving the connection efficiency between the electrode terminal 25 and the adapter 24 , thereby helping to improve the production cycle.

[0130] According to some embodiments of the present application, as shown in Figures 7 to 9, the surface of the first terminal body 251 facing the second terminal body 252 has one of the recessed structure 2524 and the boss structure 2514, and the surface of the second terminal body 252 facing the first terminal body 251 has the other of the recessed structure 2524 and the boss structure 2514, and the boss structure 2514 is assembled in the recessed structure 2524.

[0131] As some embodiments of the present application, as shown in Figure 7, the surface of the first terminal body 251 facing the second terminal body 252 may have a boss structure 2514, and the surface of the second terminal body 252 facing the first terminal body 251 may have a recessed structure 2524. The boss structure 2514 may be arranged corresponding to the recessed structure 2524, and the boss structure 2514 may be assembled in the recessed structure 2524.

[0132] As a specific embodiment, as shown in Figure 7, the first terminal body 251 can have a connected first body segment 2511 and a second body segment 2512. The first body segment 2511 and the second body segment 2512 can be arranged along a direction perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in Figure 7). The surface of the first body segment 2511 facing the second terminal body 252 can have a boss structure 2514 so that the thickness of the first body segment 2511 is greater than the thickness of the second body segment 2512. The second terminal body 252 may have a third body segment 2521 and a fourth body segment 2522 connected to each other. The third body segment 2521 and the fourth body segment 2522 may be arranged along a direction perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in Figure 7). The surface of the fourth body segment 2522 facing the first terminal body 251 may have a recessed structure 2524 so that the thickness of the third body segment 2521 is greater than the thickness of the fourth body segment 2522. The surface of the first body segment 2511 facing away from the second terminal body 252 has a first welding zone 2513, and the surface of the third body segment 2521 facing away from the first terminal body 251 has a second welding zone 2523.

[0133] As some embodiments of the present application, as shown in Figure 8, the surface of the first terminal body 251 facing the second terminal body 252 may have a recessed structure 2524, and the surface of the second terminal body 252 facing the first terminal body 251 may have a boss structure 2514, the boss structure 2514 may be arranged corresponding to the recessed structure 2524, and the boss structure 2514 may be assembled in the recessed structure 2524.

[0134] As a specific embodiment, as shown in Figure 8, the first terminal body 251 can have a connected first body segment 2511 and a second body segment 2512. The first body segment 2511 and the second body segment 2512 can be arranged along a direction perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in Figure 7), and the surface of the second body segment 2512 facing the second terminal body 252 can have a recessed structure 2524 so that the thickness of the first body segment 2511 is greater than the thickness of the second body segment 2512. The second terminal body 252 may have a third body segment 2521 and a fourth body segment 2522 connected to each other. The third body segment 2521 and the fourth body segment 2522 may be arranged along a direction perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in Figure 7). The surface of the third body segment 2521 facing the first terminal body 251 may have a boss structure 2514 so that the thickness of the third body segment 2521 is greater than the thickness of the fourth body segment 2522. The surface of the first body segment 2511 facing away from the second terminal body 252 has a first welding zone 2513, and the surface of the third body segment 2521 facing away from the first terminal body 251 has a second welding zone 2523.

[0135] In the above technical solution, the first terminal body 251 and the second terminal body 252 are respectively provided with a boss structure 2514 and a recessed structure 2524, so that the boss structure 2514 and the recessed structure 2524 can play a positioning role, so as to facilitate the assembly of the first terminal body 251 and the second terminal body 252 together, and the boss structure 2514 and the recessed structure 2524 can also play a limiting role, so as to reduce the probability of the first terminal body 251 and the second terminal body 252 being displaced in a direction perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in Figure 7). Moreover, such an arrangement can also thicken the local positions of the first terminal body 251 and the second terminal body 252, which is beneficial to improving the connection quality between the electrode terminal 25 and the adapter 24 and the bus 30.

[0136] According to some embodiments of the present application, as shown in FIG. 9 , the first terminal body 251 has a through-hole structure 2515 that penetrates the first terminal body 251 along the thickness direction of the first wall 21 .

[0137] 9 , along the thickness direction of the first wall 21 (i.e., the Z direction shown in FIG7 ), the through-hole structure 2515 may penetrate the first terminal body 251. In some embodiments of the present application, the first terminal body 251 may include a first body segment 2511 and a second body segment 2512 connected to each other. Along a direction perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in FIG7 ), the second body segment 2512 may be sleeved on the outside of the first body segment 2511, and the first body segment 2511 may have the through-hole structure 2515.

[0138] As some embodiments of the present application, as shown in Figure 9, the second terminal body 252 may have a connected third body segment 2521 and a fourth body segment 2522. The third body segment 2521 and the fourth body segment 2522 may be arranged along a direction perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in Figure 7), and part of the structure of the third body segment 2521 may be located within the through-hole structure 2515.

[0139] In the above technical solution, by providing the first terminal body 251 with a through-hole structure 2515 that penetrates the first terminal body 251 along the thickness direction of the first wall 21, material can be saved, thereby facilitating reducing the production cost of the electrode terminal 25. Moreover, by providing a partial structure of the third body segment 2521 of the second terminal body 252 within the through-hole structure 2515, it is possible to facilitate the assembly of the first terminal body 251 and the second terminal body 252 together.

[0140] According to some embodiments of the present application, the electrode terminal 25 is a negative electrode terminal 253 .

[0141] Among them, as some embodiments of the present application, referring to Figures 3 and 4, the battery cell 20 may include a positive electrode terminal 254 and a negative electrode terminal 253, and the positive electrode terminal 254 and the negative electrode terminal 253 may both be arranged on the first wall 21 of the battery cell 20. The electrode terminal 25 described herein may be the negative electrode terminal 253 of the battery cell 20.

[0142] In the above technical solution, by making the electrode terminal 25 a negative electrode terminal 253, the thickness of the negative electrode terminal 253 can be reduced without affecting the connection quality between the negative electrode terminal 253 and the adapter 24 and the busbar 30, thereby helping to reduce the production cost of the battery cell 20 and improving the capacity of the battery cell 20.

[0143] As some embodiments of the present application, the electrode terminal 25 described herein may also be a positive electrode terminal 254 .

[0144] According to some embodiments of the present application, the first terminal body 251 and the second terminal body 252 are made of different materials.

[0145] For example, the material of the first terminal body 251 can be aluminum (that is, the first terminal body 251 can be constructed as an aluminum part), and the material of the second terminal body 252 can be copper (that is, the second terminal body 252 can be constructed as a copper part). Alternatively, the material of the first terminal body 251 can be aluminum (that is, the first terminal body 251 can be constructed as an aluminum part), and the material of the second terminal body 252 can be nickel (that is, the second terminal body 252 can be constructed as a nickel part).

[0146] In the above technical solution, by making the materials of the first terminal body 251 and the second terminal body 252 different, it can adapt to the materials of the adapter 24 and the busbar 30, which is beneficial to improving the connection stability between the electrode terminal 25 and the adapter 24 and the busbar 30.

[0147] According to some embodiments of the present application, the first terminal body 251 is constructed as an aluminum member, and the second terminal body 252 is constructed as a copper member.

[0148] That is to say, the material of the first terminal body 251 can be aluminum, and the material of the second terminal body 252 can be copper. The chemical properties of copper and aluminum are stable and not prone to corrosion. In addition, copper and aluminum have good conductivity and can effectively transmit current, reduce resistance and energy loss. Moreover, the cost of copper and aluminum is relatively low, which is conducive to reducing production costs and is suitable for large-scale production. In addition, copper and aluminum have good processing performance and are relatively easy to make electrode terminals 25 of various shapes and sizes, which can meet the needs of different types of battery cells 20.

[0149] In the above technical solution, by constructing the first terminal body 251 as an aluminum part and constructing the second terminal body 252 as a copper part, it is beneficial to improve the reliability of the electrode terminal 25 and reduce the production cost.

[0150] According to some embodiments of the present application, the present application further provides a battery 100 , which includes multiple battery cells 20 in the above embodiments and a bus bar 30 , which is used to connect the first molten pool areas 40 of the multiple battery cells 20 .

[0151] According to some embodiments of the present application, the present application further provides an electrical device, which includes the battery cell 20 in the above embodiment, or the electrical device includes the battery 100 in the above embodiment, and the battery 100 is used to provide electrical energy for the electrical device.

[0152] The power-consuming device may be any of the aforementioned devices or systems using the battery 100 .

[0153] According to some embodiments of the present application, as shown in FIG8 , the present application provides a battery cell 20 , which includes: a housing 23 , an electrode assembly 22 , an adapter 24 , and an electrode terminal 25 .

[0154] In which, the outer shell 23 is provided with a accommodating cavity 26, and the outer shell 23 includes a first wall 21, the electrode assembly 22 is provided with a pole ear, the electrode assembly 22 can be arranged in the accommodating cavity 26, the electrode terminal 25 is arranged on the first wall 21, and the electrode terminal 25 can be connected to the bus 30 of the battery 100, and the adapter 24 is used to connect the pole ear and the electrode terminal 25, that is, the adapter 24 can be connected to the pole ear, and the electrode terminal 25 can be connected to the adapter 24.

[0155] The electrode terminal 25 is formed with a first molten pool area 40 and a second molten pool area 41, wherein the first molten pool area 40 is used to connect to the busbar 30, and the second molten pool area 41 is used to connect to the adapter 24. The electrode terminal 25 includes a first terminal body 251 and a second terminal body 252 stacked along the thickness direction of the first wall 21 (i.e., the Z direction shown in Figure 7). The first terminal body 251 is constructed of aluminum, and the second terminal body 252 is constructed of copper.

[0156] As shown in Figure 8, the first terminal body 251 has a first body segment 2511 and a second body segment 2512 that are connected. The first body segment 2511 and the second body segment 2512 are arranged in a direction perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in Figure 7). The surface of the first body segment 2511 facing away from the second terminal body 252 has a first welding zone 2513, and the first welding zone 2513 corresponds to the first molten pool zone 40. Along the thickness direction of the first wall 21 (i.e., the Z direction shown in Figure 7), the surface of the second body segment 2512 facing the second terminal body 252 may have a recessed structure 2524, and the thickness of the first body segment 2511 is greater than the thickness of the second body segment 2512.

[0157] As shown in Figure 8, the second terminal body 252 has a connected third body segment 2521 and a fourth body segment 2522. The third body segment 2521 and the fourth body segment 2522 are arranged in a direction perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in Figure 7). The surface of the third body segment 2521 facing away from the first terminal body 251 has a second welding zone 2523, and the second welding zone 2523 corresponds to the second molten pool zone 41. Along the thickness direction of the first wall 21 (i.e., the Z direction shown in Figure 7), the surface of the third body segment 2521 facing the first terminal body 251 may have a boss structure 2514, and the boss structure 2514 may be assembled in the recessed structure 2524. The thickness of the third body segment 2521 is greater than the thickness of the fourth body segment 2522.

[0158] A plane is set, which is perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction shown in Figure 7). Along the thickness direction of the first wall 21 (i.e., the Z direction shown in Figure 7), the first melt pool area 40 and the second melt pool area 41 both have orthographic projections on the plane, and the orthographic projection of the first melt pool area 40 surrounds the orthographic projection of the second melt pool area 41, that is, the orthographic projection of the first melt pool area 40 is located outside the orthographic projection of the second melt pool area 41, that is, along the thickness direction of the first wall 21, the orthographic projection of the first melt pool area 40 and the orthographic projection of the second melt pool area 41 are completely staggered.

[0159] By staggering the first molten pool area 40 and the second molten pool area 41 in a direction perpendicular to the thickness direction of the first wall 21, the thickness of the electrode terminal 25 can be reduced without affecting the connection quality between the electrode terminal 25 and the adapter 24 and the busbar 30, thereby helping to reduce the production cost of the battery cell 20. In addition, reducing the thickness of the electrode terminal 25 can reduce the installation space required for the electrode terminal 25, which is beneficial to increasing the capacity of the battery cell 20.

[0160] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0161] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell, wherein: include: A housing is provided with a receiving cavity, wherein the housing includes a first wall; an electrode assembly, the electrode assembly being disposed in the accommodating cavity and provided with an electrode tab; an electrode terminal, disposed on the first wall, the electrode terminal being used to connect to a busbar of the battery; An adapter, the adapter being used to connect the tab and the electrode terminal; The electrode terminal is formed with a first molten pool area and a second molten pool area, the first molten pool area is used to connect to the bus bar, and the second molten pool area is connected to the adapter, and the first molten pool area and the second molten pool area are staggered along a direction perpendicular to the thickness direction of the first wall.

2. The battery cell according to claim 1, wherein: Along the thickness direction of the first wall, the orthographic projection of the first molten pool area and the orthographic projection of the second molten pool area are completely staggered.

3. The battery cell according to claim 1, wherein: The electrode terminal includes a first terminal body and a second terminal body stacked along the thickness direction of the first wall, the first terminal body is located on a side of the second terminal body away from the accommodating cavity, the surface of the first terminal body has a first welding area corresponding to the first molten pool area, the surface of the second terminal body has a second welding area corresponding to the second molten pool area, and the first welding area and the second welding area are staggered along a direction perpendicular to the thickness direction of the first wall; The first terminal body has a first body segment and a second body segment connected to each other, the first body segment and the second body segment are arranged in a direction perpendicular to the thickness direction of the first wall, the first welding zone is formed on the surface of the first body segment, and along the thickness direction of the first wall, the thickness of the first body segment is greater than the thickness of the second body segment.

4. The battery cell according to claim 3, wherein: The second terminal body has a third body segment and a fourth body segment connected to each other, and the third body segment and the fourth body segment are arranged in a direction perpendicular to the thickness direction of the first wall. The second welding zone is formed on the surface of the third body segment, and along the thickness direction of the first wall, the thickness of the third body segment is greater than the thickness of the fourth body segment.

5. The battery cell according to claim 4, wherein: The thickness of the fourth body segment is greater than or equal to 0.1 mm.

6. The battery cell according to any one of claims 3 to 5, wherein: Along a direction perpendicular to the thickness direction of the first wall, the second welding zone is located in the middle of the second terminal body, and the first welding zone is located outside the second welding zone.

7. The battery cell according to claim 6, wherein: Along the first wall thickness direction, the orthographic projection of the first weld zone is arranged around the orthographic projection of the second weld zone.

8. The battery cell according to claim 6 or 7, wherein: The second welding zone is linear in structure. There are two first welding zones. Along a direction perpendicular to the thickness direction of the first wall, the two first welding zones are located on opposite sides of the second welding zone.

9. The battery cell according to any one of claims 3 to 8, wherein: Along a direction perpendicular to the thickness direction of the first wall, the first welding zone is located in the middle of the first terminal body, and the second welding zone is located outside the first welding zone.

10. The battery cell according to claim 9, wherein: Along the first wall thickness direction, the orthographic projection of the second weld zone is arranged around the orthographic projection of the first weld zone.

11. The battery cell according to any one of claims 3 to 10, wherein: The surface of the first terminal body facing away from the second terminal body has the first welding area, and the surface of the second terminal body facing away from the first terminal body has the second welding area.

12. The battery cell according to any one of claims 3 to 11, wherein: The surface of the first terminal body facing the second terminal body has one of a recessed structure and a boss structure, and the surface of the second terminal body facing the first terminal body has the other of the recessed structure and the boss structure, and the boss structure is assembled in the recessed structure.

13. The battery cell according to any one of claims 3 to 12, wherein: The first terminal body has a through-hole structure penetrating the first terminal body along the thickness direction of the first wall.

14. The battery cell according to any one of claims 3 to 13, wherein: The first terminal body and the second terminal body are made of different materials.

15. The battery cell according to claim 14, wherein: The first terminal body is constructed as an aluminum piece, and the second terminal body is constructed as a copper piece.

16. A battery, wherein: The method comprises a plurality of battery cells according to any one of claims 1 to 15 and a bus bar, wherein the bus bar is used to connect the first molten pool areas of the plurality of battery cells.

17. An electrical device, wherein: The method comprises the battery cell according to any one of claims 1 to 15 or the battery according to claim 14.

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