Battery cell, battery and electric device

Abstract

The utility model discloses a battery monomer, a battery and a power utilization device. The battery monomer comprises a shell, and the shell comprises a first wall; the electrode assembly is provided with a tab; the electrode terminal is arranged on the first wall and is used for being connected with a busbar of the battery; the adapter is used for connecting the tab and the electrode terminal; a first molten pool area and a second molten pool area are formed on the electrode terminal, the first molten pool area is used for being connected with the busbar, the second molten pool area is connected with the adapter, and the first molten pool area and the second molten pool area are staggered in the direction perpendicular to the thickness direction of the first wall. Therefore, the first molten pool area and the second molten pool area are staggered along the direction perpendicular to the thickness direction of the first wall, so that the thickness of the electrode terminal can be reduced on the basis of not influencing the connection quality of the electrode terminal, the adapter and the busbar, and the production cost of the battery monomer is reduced; the installation space required by the electrode terminal can be reduced by reducing the thickness of the electrode terminal, so that the capacitance of the single battery is improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0002] 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, and 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. Utility Model Content

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present application is to provide a battery cell having a small thickness of an electrode terminal, which is conducive to reducing the production cost of the battery cell and increasing the capacity of the battery cell.

[0004] The present application further proposes a battery.

[0005] The present application further proposes an electrical device.

[0006] In a first aspect, an embodiment of the present application provides a battery cell, including:

[0007] A housing is provided with a receiving cavity, and the housing comprises a first wall;

[0008] An electrode assembly is disposed in the accommodating cavity and is provided with a pole ear;

[0009] An electrode terminal is disposed on the first wall, and the electrode terminal is used to connect to a busbar of the battery;

[0010] An adapter, which is used to connect the tab and the electrode terminal;

[0011] 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, the second molten pool area is connected with 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.

[0012] 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 helpful to increase the capacity of the battery cell.

[0013] In some embodiments, along the thickness direction of the first wall, the orthographic projection of the first molten pool region and the orthographic projection of the second molten pool region are completely offset.

[0014] In the above technical solution, by completely staggering the orthographic projection of the first molten pool area and the orthographic projection of the second molten pool area, the thickness of the electrode terminal can be further reduced without affecting the connection quality between the electrode terminal and the adapter and bus bar, which is beneficial to further reduce the production cost of the battery cell.

[0015] In some embodiments, 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;

[0016] The first terminal body has a first body section and a second body section that are connected. The first body section and the second body section are arranged in a direction perpendicular to the thickness direction of the first wall. A first welding zone is formed on the surface of the first body section. Along the thickness direction of the first wall, the thickness of the first body section is greater than the thickness of the second body section.

[0017] In the above technical solution, by making the electrode terminal include the first terminal body and the second terminal body stacked along the thickness direction of the first wall, the electrode terminal can be made of the same material or different materials according to the needs, which can adapt to the materials of the adapter and the bus bar, which is conducive to improving the connection stability between the electrode terminal and the adapter and the bus bar. And the surface of the first terminal body and the surface of the second terminal body are respectively provided with the first welding area and the second welding area, which can facilitate the connection of the electrode terminal with the adapter and the bus bar.

[0018] By making the first terminal body have a first body section and a second body section that are connected and have different thicknesses, and forming a first welding zone in the first body section with a relatively large thickness, sufficient melting depth can be provided for the connection between the first body section and the bus, and the connection reliability between the first body section and the bus can be improved. In addition, by forming the first welding zone in the first body section with a relatively large thickness, the influence of the connection process of the first body section and the bus on the connection between the second terminal body and the adapter can be reduced, which is beneficial to ensuring the connection reliability between the second terminal body and the adapter.

[0019] In some embodiments, the second terminal body has a third body segment and a fourth body segment connected to each other, the third body segment and the fourth body segment are arranged in a direction perpendicular to the thickness direction of the first wall, a 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.

[0020] In the above technical solution, by making the second terminal body have a third body segment and a fourth body segment that are connected and have different thicknesses, and by forming a second welding zone in the third body segment with relatively larger thickness, sufficient welding depth can be provided for the connection between the third body segment and the adapter, thereby improving the connection reliability between the third body segment and the adapter.

[0021] In some embodiments, the thickness of the fourth body segment is greater than or equal to 0.1 mm.

[0022] In the above technical solution, by making the thickness of the fourth body segment greater than or equal to 0.1 mm, the probability of the surface of the first terminal body close to the second terminal body being exposed can be reduced. It should be explained that if the surface of the first terminal body close to the second terminal body is exposed, the exposed part will be corroded after contacting the electrolyte of the battery cell. Therefore, by making the thickness of the fourth body segment greater than or equal to 0.1 mm, it is beneficial to improve the reliability of the electrode terminal.

[0023] In some embodiments, 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.

[0024] In the above technical solution, by locating the second welding zone in the middle of the second terminal body and the first welding zone on the outside of the second welding zone, the second welding zone and the first welding zone can be reasonably positioned, and the first welding zone and the second welding zone can be staggered in a direction perpendicular to the thickness direction of the first wall, thereby reducing the thickness of the electrode terminal, which is beneficial to reducing the production cost of the battery cell and increasing the capacity of the battery cell.

[0025] In some embodiments, along the first wall thickness direction, an orthographic projection of the first weld zone is disposed around an orthographic projection of the second weld zone.

[0026] In the above technical solution, by making the orthographic projection of the first welding zone surround the orthographic projection of the second welding zone, the second welding zone and the first welding zone can be reasonably positioned, and the first welding zone and the second welding zone can be staggered in a direction perpendicular to the thickness direction of the first wall, thereby reducing the thickness of the electrode terminal, which is beneficial to reducing the production cost of the battery cell and increasing the capacity of the battery cell. Moreover, such a setting can facilitate the connection of the electrode terminal with the adapter and the bus, which is beneficial to reducing the difficulty of manufacturing the battery cell and reducing the difficulty of connecting the battery cell to the bus.

[0027] In some embodiments, the second weld zone is linear, there are two first weld zones, and along a direction perpendicular to the thickness direction of the first wall, the two first weld zones are located at opposite sides of the second weld zone.

[0028] In the above technical solution, by constructing the second welding zone into a straight line and locating the two first welding zones on opposite sides of the second welding zone, the shape of the second welding zone can be made reasonable, and the setting positions of the second welding zone and the first welding zone can be made reasonable, so as to effectively reduce the influence of welding one of the electrode terminal and the adapter or the bus on the connection between the electrode terminal and the other of the adapter or the bus, and such a setting can reduce the thickness of the electrode terminal, which is beneficial to reducing the production cost of the battery cell and improving the capacity of the battery cell.

[0029] In some embodiments, along a direction perpendicular to a thickness direction of the first wall, the first welding zone is located in a middle position of the first terminal body, and the second welding zone is located outside the first welding zone.

[0030] In the above technical solution, by locating the first welding zone in the middle of the first terminal body and the second welding zone on the outside of the first welding zone, the second welding zone and the first welding zone can be reasonably positioned, and the first welding zone and the second welding zone can be staggered in a direction perpendicular to the thickness direction of the first wall, thereby reducing the thickness of the electrode terminal, which is beneficial to reducing the production cost of the battery cell and increasing the capacity of the battery cell.

[0031] In some embodiments, along the first wall thickness direction, an orthographic projection of the second weld zone is disposed around an orthographic projection of the first weld zone.

[0032] In the above technical solution, by making the orthographic projection of the second welding zone surround the orthographic projection of the first welding zone, the second welding zone and the first welding zone can be reasonably positioned, and the first welding zone and the second welding zone can be staggered in a direction perpendicular to the thickness direction of the first wall, thereby reducing the thickness of the electrode terminal, which is beneficial to reducing the production cost of the battery cell and increasing the capacity of the battery cell. Moreover, such a setting can facilitate the connection of the electrode terminal with the adapter and the bus, which is beneficial to reducing the difficulty of manufacturing the battery cell and reducing the difficulty of connecting the battery cell to the bus.

[0033] In some embodiments, a surface of the first terminal body facing away from the second terminal body has a first welding zone, and a surface of the second terminal body facing away from the first terminal body has a second welding zone.

[0034] In the above technical solution, by making the surface of the first terminal body facing away from the second terminal body have a first welding zone, and making the surface of the second terminal body facing away from the first terminal body have a second welding zone, the first welding zone and the second welding zone can be reasonably set, which can facilitate the connection between the electrode terminal and the adapter and the bus, which is beneficial to reducing the manufacturing difficulty of the battery cell, and improving the connection efficiency between the battery cell and the bus, thereby helping to improve the production cycle.

[0035] In some embodiments, the surface of the first terminal body facing the second terminal body has one of a recessed structure and a boss structure, 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.

[0036] In the above technical solution, by making the first terminal body and the second terminal body have a boss structure and a recessed structure respectively, the boss structure and the recessed structure can play a positioning role, so as to facilitate the first terminal body and the second terminal body to be assembled together, and the boss structure and the recessed structure can also play a limiting role, so as to reduce the first terminal body and the second terminal body in the direction perpendicular to the first wall thickness direction (i.e. Figure 7 Moreover, such an arrangement can also thicken the local positions of the first terminal body and the second terminal body, which is beneficial to improving the connection quality between the electrode terminal and the adapter and the bus bar.

[0037] In some embodiments, the first terminal body has a through hole structure penetrating the first terminal body along a thickness direction of the first wall.

[0038] In the above technical solution, by making the first terminal body have a through hole structure that penetrates the first terminal body along the first wall thickness direction, material can be saved, which is beneficial to reducing the production cost of the electrode terminal. Moreover, by making part of the structure of the third body segment of the second terminal body located in the through hole structure, the first terminal body and the second terminal body can be easily assembled together.

[0039] In some embodiments, the first terminal body and the second terminal body are made of different materials.

[0040] In the above technical solution, by making the first terminal body and the second terminal body of different materials, it can adapt to the materials of the adapter and the bus, which is beneficial to improve the connection stability between the electrode terminal and the adapter and the bus.

[0041] In some embodiments, the first terminal body is configured as an aluminum member, and the second terminal body is configured as a copper member.

[0042] In the above technical solution, by constructing the first terminal body as an aluminum part and the second terminal body as a copper part, it is helpful to improve the reliability of the electrode terminal and reduce the production cost.

[0043] 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.

[0044] 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.

[0045] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0047] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0048] Figure 2 An exploded view of the structure of a battery provided in some embodiments of the present application;

[0049] Figure 3 A schematic diagram of the connection between a battery cell and a bus bar provided in some embodiments of the present application;

[0050] Figure 4 An exploded schematic diagram of a battery cell and a bus bar provided in some embodiments of the present application;

[0051] Figure 5 A schematic diagram of the connection between a battery cell and a busbar from another angle provided in some embodiments of the present application;

[0052] Figure 6 yes Figure 5 Sectional view at CC;

[0053] Figure 7 yes Figure 6 The enlarged schematic diagram of D in the figure (as an embodiment of the present application);

[0054] Figure 8 yes Figure 6 An enlarged schematic diagram of point D in the middle (as another embodiment of the present application);

[0055] Fig. 9 yes Figure 6 An enlarged schematic diagram of point D in the middle (as another embodiment of the present application);

[0056] Fig.10 A schematic diagram of an electrode terminal provided in some embodiments of the present application;

[0057] Fig.11 An exploded schematic diagram of an electrode terminal provided in some embodiments of the present application.

[0058] Reference numerals:

[0059] Vehicle 1000; battery 100; controller 200; motor 300;

[0060] Box body 10; first box body 11; second box body 12; battery cell 20;

[0061] First wall 21; electrode assembly 22; housing 23; adapter 24; electrode terminal 25; accommodating cavity 26;

[0062] First terminal body 251; first body section 2511; second body section 2512; first welding area 2513; boss structure 2514; through hole structure 2515;

[0063] The second terminal body 252; the third body section 2521; the fourth body section 2522; the second welding area 2523; the recessed structure 2524;

[0064] Negative electrode terminal 253; positive electrode terminal 254;

[0065] Busbar 30 ; first molten pool area 40 ; second molten pool area 41 . DETAILED DESCRIPTION

[0066] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0067] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. 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 and secondary relationship.

[0068] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0069] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0070] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0071] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0072] The term "plurality" used in the present application refers to two or more (including two).

[0073] In the present 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., which are not limited in the embodiments of the present application. Battery cells may be flat, rectangular or in other shapes, etc., which are not limited in the embodiments of the present application. Battery cells are generally divided into square battery cells and soft-pack battery cells according to the packaging method, which are not limited in the embodiments of the present application.

[0074] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells or multiple battery modules. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0075] The battery cell includes a shell, an electrode assembly and an electrolyte, and the shell is used to contain the electrode assembly and the electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode collector, the positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer, and the positive electrode collector not coated with the positive electrode active material layer serves as the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode collector, the negative electrode collector not coated with the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer, and the negative electrode collector not coated with the negative electrode active material layer serves as the negative electrode tab. The negative electrode current collector may be made of copper, and the negative electrode active material may be carbon or silicon, etc. In order to ensure that a large current can be passed without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.

[0076] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a winding structure or a stacked structure, but the embodiments of the present application are not limited thereto.

[0077] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. The battery consists of a box and multiple battery cells contained in the box. Among them, batteries, as core components of new energy vehicles, have high requirements in terms of reliability and cycle life.

[0078] The battery includes a plurality of battery cells, each of which includes an electrode terminal. One end of the electrode terminal is connected to an adapter plate, and the other end of the electrode terminal is connected to a connecting plate. Furthermore, the connection between the electrode terminal and the adapter plate and the connection between the electrode terminal and the connecting plate are directly opposite to each other 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, thick electrode terminals are required. However, thick electrode terminals not only have high production costs, but also occupy installation space, thereby affecting the capacity of the battery cell.

[0079] Based on the above considerations, in order to solve the technical problem that the thick electrode terminal leads to high cost of battery cells and affects the capacity of battery cells. The present application proposes a battery cell, comprising: a shell, provided with a receiving cavity, the shell comprising a first wall; an electrode assembly, the electrode assembly is arranged in the receiving cavity and is provided with a pole ear; an electrode terminal, arranged on the first wall, the electrode terminal is used to connect with the busbar of the battery; an adapter, the adapter is used to connect the pole ear 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 with the busbar, the second molten pool area is connected with 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.

[0080] 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.

[0081] The battery disclosed in the embodiment of the present application can be used in, but not limited to, electrical devices such as vehicles, ships or aircraft. The battery disclosed in the present application can be used to form a power supply system of the electrical device.

[0082] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, 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., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0083] 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.

[0084] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may 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 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and 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.

[0085] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve 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.

[0086] Please refer to Figure 2 , Figure 2The structural exploded diagram of the battery 100 provided for some embodiments of the present application. The battery 100 includes a box body 10 and a plurality of battery cells 20, and the battery cells 20 are used to be accommodated in the box body 10. Among them, the box body 10 is used to provide an assembly space for the battery cells 20, and the box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first box body 11 and a second box body 12, and the first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cells 20. The second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define the assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box 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.

[0087] In the battery 100, multiple battery cells 20 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection means that multiple battery cells 20 are connected in series and in parallel. Multiple battery cells 20 can be directly connected in series, in parallel, or in a hybrid connection, and then the whole formed by multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 can also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a hybrid connection, and then multiple battery modules are connected in series, in parallel, or in a hybrid connection to form a whole, and accommodated in the box 10. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between multiple battery cells 20.

[0088] Each battery cell 20 may be a secondary battery or a primary battery, or 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.

[0089] Refer to the following Figure 3-Figure 11 A battery cell 20 according to an embodiment of the present application is described.

[0090] Reference Figure 3-Figure 11 As shown, the battery cell 20 according to the embodiment of the present application includes:

[0091] The housing 23 is provided with a receiving cavity 26, and the housing 23 includes a first wall 21;

[0092] The electrode assembly 22 is disposed in the accommodating cavity 26 and is provided with a pole ear;

[0093] The electrode terminal 25 is disposed on the first wall 21 , and the electrode terminal 25 is used to connect with the bus bar 30 of the battery 100 ;

[0094] The adapter 24 is used to connect the electrode tab and the electrode terminal 25;

[0095] 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 in a direction perpendicular to the thickness direction of the first wall 21 .

[0096] Among them, refer to Figure 3 and Figure 4 As shown, 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 is 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.

[0097] As some embodiments of the present application, the bus 30 can be connected between two battery cells 20, for example, the bus 30 can be connected between the electrode terminals 25 of the two battery cells 20, or the bus 30 can be connected between the electrode terminals 25 of the battery cell 20 and other components, for example, the bus 30 can be connected between the electrode terminals 25 of the battery cell 20 and a distributor.

[0098] 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 with the busbar 30, and the second molten pool area 41 is used to connect with 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 a welding process. According to different processes, 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 a welding process. According to different processes, the second molten pool area 41 may include some fillers (such as but not limited to welding rods).

[0099] Along the thickness direction of the first wall 21 (i.e. Figure 7 In the direction perpendicular to the Z direction shown in FIG. 1 , the first molten pool area 40 and the second molten pool area 41 are staggered. Figure 7The direction perpendicular to the Z direction shown in FIG. 1 can be understood as setting a plane that is perpendicular to the thickness direction of the first wall 21 (i.e. Figure 7 In other words, the thickness direction of the first wall 21 (ie, the Z direction) is perpendicular to the Figure 7 The Z direction (as shown) is parallel to the normal of the plane. Along the direction parallel to the plane, the first molten pool area 40 and the second molten pool area 41 are staggered.

[0100] Along the thickness direction of the first wall 21 (i.e. Figure 7 The first welding area 2513 and the second welding area 2523 are staggered in a direction perpendicular to the Z direction shown in FIG. 2 . It can be understood that a plane is set, and the plane is parallel to the thickness direction of the first wall 21 (i.e. Figure 7 The Z direction shown in FIG. 2 is perpendicular to the thickness direction of the first wall 21 (ie, Figure 7 In the Z direction shown in the figure), the orthographic projection of the first molten pool area 40 on the plane partially overlaps with the orthographic projection of the second molten pool area 41 on the plane, that is, a part of the orthographic projection of the first molten pool area 40 on the plane overlaps with the orthographic projection of the second molten pool area 41 on the plane, and another part of 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, or, along the thickness direction of the first wall 21 (i.e. Figure 7 In the Z direction shown in the figure, 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 does not have any overlapping part with the orthographic projection of the second molten pool area 41 on the plane.

[0101] It should be explained that if the first molten pool area 40 and the second molten pool area 41 are perpendicular to the thickness direction of the first wall 21 (i.e. Figure 7 In order not to affect the connection quality between the electrode terminal 25 and the adapter 24 and the bus bar 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.

[0102] By making the first molten pool area 40 and the second molten pool area 41 perpendicular to the thickness direction of the first wall 21 (i.e. Figure 7 The electrode terminals 25 and the busbar 30 are staggered in the Z direction as shown in the figure. Compared with the prior art, the influence of the heat generated when the electrode terminal 25 and the busbar 30 are welded on the connection between the electrode terminal 25 and the adapter 24 can be reduced. Or the influence of the heat generated when the electrode terminal 25 and the adapter 24 are welded on the connection between the electrode terminal 25 and the busbar 30 can be reduced. This can be understood as follows: since the first molten pool area 40 and the second molten pool area 41 are perpendicular to the thickness direction of the first wall 21 (i.e. Figure 7In other words, the heat transfer path between the first molten pool area 40 and the second molten pool area 41 can be 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 bus bar 30.

[0103] For example, assuming that the first molten pool region 40 and the second molten pool region 41 are perpendicular to the thickness direction of the first wall 21 (i.e. Figure 7 In order to ensure the connection quality, the thickness of one 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, and by making the first molten pool area 40 and the second molten pool area 41 perpendicular to the thickness direction of the first wall 21 (i.e. Figure 7 The electrode terminals 25 are staggered in the Z direction (as shown in the figure), and the thickness of the electrode terminals 25 can be set to be 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.

[0104] Therefore, by making the first molten pool area 40 and the second molten pool area 41 perpendicular to the thickness direction of the first wall 21 (i.e. Figure 7 By staggering the electrode terminals 25 in the direction of (Z direction shown in the figure), the thickness of the electrode terminals 25 can be reduced without affecting the connection quality between the electrode terminals 25 and the adapter 24 and the bus bar 30. Reducing the thickness of the electrode terminals 25 can reduce the production cost of the battery cell 20. In addition, reducing the thickness of the electrode terminals 25 can reduce the space occupied by the electrode terminals 25 (that is, reducing the thickness of the electrode terminals 25 can reduce the installation space required for the electrode terminals 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.

[0105] 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 bus bar 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 increase the capacity of the battery cell 20.

[0106] 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.

[0107] It can be understood that a plane is set, which is parallel to the thickness direction of the first wall 21 (i.e. Figure 7The Z direction shown in FIG. 2 is perpendicular to the thickness direction of the first wall 21 (ie, Figure 7 In the Z direction shown in the figure, 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 does not have any overlapping part with the orthographic projection of the second molten pool area 41 on the plane.

[0108] 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 bus bar 30, which is beneficial to further reduce the production cost of the battery cell 20.

[0109] 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.

[0110] According to some embodiments of the present application, referring to Figure 7-Figure 11 As shown, 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 the 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, the surface of the second terminal body 252 has a second welding area 2523 corresponding to the second molten pool area 41, and 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;

[0111] The first terminal body 251 has a first body section 2511 and a second body section 2512 connected to each other. 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.

[0112] The electrode terminal 25 includes a first terminal body 251 and a second terminal body 252, which are arranged along the thickness direction of the first wall 21 (i.e. Figure 7 In the Z direction shown in the figure, the first terminal body 251 and the second terminal body 252 are stacked.

[0113] 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.

[0114] 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 is possible to 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.

[0115] As some embodiments of the present application, the first terminal body 251 and the second terminal body 252 are stacked, and the material of the first terminal body 251 and the second terminal body 252 can be the same. For example, the material of the first terminal body 251 and the second terminal body 252 can both be sodium, which is helpful to reduce the difficulty of producing the electrode terminal 25.

[0116] 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 zone 40. As some embodiments of the present application, the first welding zone 2513 is connected to the first molten pool zone 40. The surface of the second terminal body 252 has a second welding zone 2523, which corresponds to the second molten pool zone 41. As some embodiments of the present application, the second welding zone 2523 can be connected to the second molten pool zone 41.

[0117] The first welding zone 2513 and the second welding zone 2523 are staggered in a direction perpendicular to the thickness direction of the first wall 21, which can be understood as setting a plane that is perpendicular to the thickness direction of the first wall 21 (i.e. Figure 7 The Z direction shown in FIG. 2 is perpendicular to the thickness direction of the first wall 21 (ie, Figure 7 In the Z direction shown in the figure), 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, 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. Figure 7In the Z direction shown in the figure, 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 overlap with the orthographic projection of the second welding zone 2523 on the plane.

[0118] It should be explained that after the electrode terminal 25 is welded to the busbar 30, the electrode terminal 25 forms a first molten pool area 40, the first molten pool area 40 is connected between the first terminal body 251 and the busbar 30, and the first fusion zone 2513 can be understood as the area where the first terminal body 251 is connected to the first molten pool area 40. After the electrode terminal 25 is welded to the adapter 24, the electrode terminal 25 forms a second molten pool area 41, the second molten pool area 41 is connected between the second terminal body 252 and the adapter 24, and the second fusion zone 2523 can be understood as the area where the second terminal body 252 is connected to the second molten pool area 41.

[0119] Reference Figure 7-Figure 11 As shown, the first terminal body 251 has a first body section 2511 and a second body section 2512, and the first body section 2511 and the second body section 2512 are connected. As some embodiments of the present application, the first body section 2511 and the second body section 2512 can be integrally formed, that is, the first body section 2511 and the second body section 2512 can be constructed as an integral piece. Figure 7 In the Z direction shown in FIG. 1 , the first body segment 2511 and the second body segment 2512 are arranged. As some embodiments of the present application, refer to Figure 8 As shown, the first body section 2511 can be sleeved on the outside of the second body section 2512, or refer to Figure 7 As shown, the second body section 2512 can be sleeved on the outside of the first body section 2511. The surface of the first body section 2511 can be formed with a first welding zone 2513, along the thickness direction of the first wall 21 (i.e. Figure 7 In the Z direction shown in the figure, the thickness of the first body segment 2511 is greater than the thickness of the second body segment 2512.

[0120] In the above technical solution, by making the electrode terminal 25 include the first terminal body 251 and the second terminal body 252 stacked along the thickness direction of the first wall 21, the electrode terminal 25 can be made of the same material or different materials according to needs, which can adapt to the materials of the adapter 24 and the busbar 30, which is conducive to improving the connection stability between the electrode terminal 25 and the adapter 24 and the busbar 30. And the surface of the first terminal body 251 and the surface of the second terminal body 252 are respectively provided with the first welding area 2513 and the second welding area 2523, which can facilitate the connection of the electrode terminal 25 with the adapter 24 and the busbar 30.

[0121] 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 30, and the connection reliability between the first body section 2511 and the bus 30 can be improved. In addition, by forming the first welding zone 2513 in the first body section 2511 with a relatively large thickness, the influence of the connection process between the first body section 2511 and the bus 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 between the second terminal body 252 and the adapter 24.

[0122] According to some embodiments of the present application, referring to Figure 7-Figure 11 As shown, the second terminal body 252 has 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 are arranged in a direction perpendicular to the thickness direction. A second welding area 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.

[0123] The third body segment 2521 and the fourth body segment 2522 are connected and arranged. As 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 an integral piece. Figure 7 In the Z direction shown in FIG. 1 , the third body segment 2521 and the fourth body segment 2522 are arranged, as some of the present application, refer to Figure 7 As shown, the third body segment 2521 can be sleeved on the outside of the fourth body segment 2522, or refer to Figure 8 As shown, the fourth body segment 2522 can be sleeved on the outside of the third body segment 2521.

[0124] The surface of the third body segment 2521 may be formed with a second welding zone 2523 along the thickness direction (i.e. Figure 7 In the Z direction shown in the figure, the thickness of the third body segment 2521 is greater than the thickness of the fourth body segment 2522.

[0125] 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 by making the third body segment 2521 with a relatively large 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, and the connection reliability of the third body segment 2521 and the adapter 24 can be improved.

[0126] According to some embodiments of the present application, referring to Figure 7 As shown, the thickness of the fourth body segment 2522 is greater than or equal to 0.1 mm.

[0127] Among them, as some embodiments of the present application, refer to Figure 7 As shown, along the thickness direction of the first wall 21 (i.e. Figure 7 The thickness of the fourth body segment 2522 may be H, and 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. As some optional embodiments of the present application, along the thickness direction of the first wall 21 (i.e. Figure 7 In the Z direction shown in the figure, the maximum thickness of the fourth body segment 2522 is 3 mm, that is, the thickness H of the fourth body segment 2522 can satisfy the relationship: 0.1 mm ≤ H ≤ 3 mm. For example, the thickness of the fourth body segment 2522 can 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.

[0128] 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.

[0129] According to some embodiments of the present application, referring to Figure 8 and Fig. 9 As shown, 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 outside the second welding zone 2523 .

[0130] A plane is set, which is parallel to the thickness direction of the first wall 21 (i.e. Figure 7 The Z direction shown in FIG. 2 is perpendicular to the thickness direction of the first wall 21 (ie, Figure 7 The second welding area 2523, the second terminal body 252, and the first welding area 2513 all have positive projections on the plane, along the thickness direction of the first wall 21 (ie Figure 7In a direction perpendicular to the Z direction shown in the plane, the orthographic projection of the second welding zone 2523 on the plane is located in the middle 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.

[0131] As some embodiments of this application, refer to Figure 8 As shown, the second terminal body 252 may have a third body section 2521 and a fourth body section 2522, the fourth body section 2522 may be sleeved on the outside of the third body section 2521, the thickness of the third body section 2521 may be greater than the thickness of the fourth body section 2522, and the third body section 2521 may be formed with a second welding zone 2523. The first terminal body 251 may have a first body section 2511 and a second body section 2512, the first body section 2511 may be sleeved on the outside of the second body section 2512, the thickness of the first body section 2511 may be greater than the thickness of the second body section 2512, and the first body section 2511 may be formed with a first welding zone 2513. In addition, along the thickness direction of the first wall 21 (i.e. Figure 7 In a direction perpendicular to the Z direction shown in the figure, 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.

[0132] In the above technical solution, by locating the second welding zone 2523 in the middle of the second terminal body 252 and locating 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.

[0133] 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 .

[0134] A plane is set, which is parallel to the thickness direction of the first wall 21 (i.e. Figure 7 The Z direction shown in FIG. 2 is perpendicular to the thickness direction of the first wall 21 (ie, Figure 7 In the Z direction shown in the figure, the second welding zone 2523 and the first welding zone 2513 both have orthographic projections on the plane, and the orthographic projection of the first welding zone 2513 can surround the orthographic projection of the second welding zone 2523.

[0135] As some embodiments of the present application, the number of the first welding zone 2513 may be multiple, for example, the number of the first welding zone 2513 may be but not limited to two, three, four, etc., and the orthographic projections of the multiple first welding zones 2513 on the plane may surround the orthographic projection of the second welding zone 2523 on the plane. As some embodiments of the present application, the number of the first welding zone 2513 may also be one, and the orthographic projection of the first welding zone 2513 on the plane may be annular, and the annular shape may be understood as but not limited to a circular ring, a polygon, etc., and the annular shape may be a closed ring or a ring with a gap, and the annular orthographic projection of the first welding zone 2513 on the plane may surround the orthographic projection of the second welding zone 2523 on the plane. As some embodiments of the present application, the number of the second welding zone 2523 may be one or more, for example, the number of the second welding zone 2523 may be but not limited to one, two, three, four, etc.

[0136] In the above technical scheme, by making the orthographic projection of the first welding zone 2513 surround the orthographic projection of the second welding zone 2523, 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 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.

[0137] 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 .

[0138] A plane is set, which is parallel to the thickness direction of the first wall 21 (i.e. Figure 7 The Z direction shown in FIG. 2 is perpendicular to the thickness direction of the first wall 21 (ie, Figure 7 In the Z direction shown in the figure, the second welding zone 2523 and the two first welding zones 2513 have orthographic projections on the plane, and the orthographic projections of the two first welding zones 2513 on the plane are located on opposite sides of the orthographic projection of the second welding zone 2523 on the plane. For example, the orthographic projections of the two first welding zones 2513 on the plane are respectively located on the upper and lower sides of the orthographic projection of the second welding zone 2523 on the plane, or the orthographic projections of the two first welding zones 2513 on the plane are respectively located on the left and right sides of the orthographic projection of the second welding zone 2523 on the plane.

[0139] As some embodiments of the present application, the orthographic projection of the second welding zone 2523 on the plane may be a straight line, which may be understood as but not limited to a rectangle with a large length-to-width ratio extending in a certain direction, an ellipse with a large ratio of a long axis to a short axis extending in a certain direction, etc. As some embodiments of the present application, the orthographic projection of at least one of the two first welding zones 2513 on the plane may be but not limited to an arc shape, a semicircle shape, etc.

[0140] In the above technical solution, by constructing the second welding zone 2523 as 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, so as to effectively reduce the influence of the connection between the electrode terminal 25 and one of the adapter 24 and the bus 30 when the electrode terminal 25 is welded with the other of the adapter 24 and the bus 30. 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.

[0141] According to some embodiments of the present application, referring to Figure 7 As shown, 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 .

[0142] A plane is set, which is parallel to the thickness direction of the first wall 21 (i.e. Figure 7 The Z direction shown in FIG. 2 is perpendicular to the thickness direction of the first wall 21 (ie, Figure 7 The second welding area 2523, the first terminal body 251, and the first welding area 2513 all have positive projections on this plane, along the thickness direction of the first wall 21 (ie Figure 7 In a direction perpendicular to the Z direction shown in the plane, the orthographic projection of the first welding zone 2513 on the plane is located in the middle of the orthographic projection of the first terminal body 251 on the plane, and the orthographic projection of the second welding zone 2523 on the plane is located outside the orthographic projection of the first welding zone 2513 on the plane.

[0143] As some embodiments of this application, refer to Figure 7As shown, the 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 on the outside of the first body section 2511, the thickness of the first body section 2511 may be greater than the thickness of the second body section 2512, and the first body section 2511 may be formed with a first welding 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 on the outside of the fourth body section 2522, the thickness of the third body section 2521 may be greater than the thickness of the fourth body section 2522, and the third body section 2521 may be formed with a second welding zone 2523. In addition, along the thickness direction of the first wall 21 (i.e. Figure 7 In a direction perpendicular to the Z direction shown in the figure, the first welding zone 2513 is located in the middle of the first terminal body 251, and the second welding zone 2523 is located on the outside of the first welding zone 2513.

[0144] 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.

[0145] 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 .

[0146] A plane is set, which is parallel to the thickness direction of the first wall 21 (i.e. Figure 7 The Z direction shown in FIG. 2 is perpendicular to the thickness direction of the first wall 21 (ie, Figure 7In the Z direction shown in the figure), the second welding zone 2523 and the first welding zone 2513 both have orthographic projections on the plane, and the orthographic projection of the second welding zone 2523 can surround the orthographic projection of the first welding zone 2513. As some embodiments of the present application, the number of the second welding zone 2523 can be multiple, for example, the number of the second welding zone 2523 can be but not limited to two, three, four, etc., and the orthographic projections of the multiple second welding zones 2523 on the plane can surround the orthographic projection of the first welding zone 2513 on the plane. As some embodiments of the present application, the number of the second welding zone 2523 can also be one, and the orthographic projection of the second welding zone 2523 on the plane can be annular, which can be understood as but not limited to a circular ring, a polygon, etc., and the ring can be a closed ring or a ring with a gap, and the annular orthographic projection of the second welding zone 2523 on the plane can surround the orthographic projection of the first welding zone 2513 on the plane. As some embodiments of the present application, the number of the first welding zones 2513 may be one or more. For example, the number of the first welding zones 2513 may be but is not limited to one, two, three, four, etc.

[0147] 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 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, 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 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.

[0148] According to some embodiments of the present application, referring to Figure 7-Figure 9 As shown, 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 .

[0149] As some embodiments of the present application, along the thickness direction of the first wall 21 (i.e. Figure 7The busbar 30, the electrode terminal 25, and the adapter 24 may be arranged in sequence, specifically, the busbar 30, the first terminal body 251, the second terminal body 252, and the adapter 24 may be arranged in sequence. The surface of the first terminal body 251 away from the second terminal body 252 may have a first welding zone 2513 (i.e., the upper surface of the first terminal body 251 may have a first welding zone 2513, i.e., the surface of the first terminal body 251 facing the busbar 30 may have a first welding zone 2513), and the first welding zone 2513 corresponds to the first molten pool zone 40. The surface of the second terminal body 252 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.

[0150] As 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, and the first terminal body 251 may be connected to the first terminal body 251 along a direction perpendicular to the thickness direction of the first wall 21 (ie, Figure 7 In the direction of the Z direction shown in FIG. 1 , the first body segment 2511 and the second body segment 2512 can be arranged to be arranged along the thickness direction of the first wall 21 (ie, 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 area 2513 .

[0151] The second terminal body 252 may include a third body segment 2521 and a fourth body segment 2522 connected to each other, and the third body segment 2521 and the fourth body segment 2522 are connected to each other along a direction perpendicular to the thickness direction of the first wall 21 (ie Figure 7 In the direction of the Z direction shown in FIG. 1 , the third body segment 2521 and the fourth body segment 2522 can be arranged to be arranged along the thickness direction of the first wall 21 (ie, Figure 7 The thickness of the third body segment 2521 may be greater than the thickness of the fourth body segment 2522, and the surface of the third body segment 2521 away from the first terminal body 251 may have a second welding zone 2523, and the first welding zone 2513 and the second welding zone 2523 are perpendicular to the thickness direction of the first wall 21 (i.e., Figure 7 The Z direction (shown) is offset.

[0152] In the above technical scheme, 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 cycle.

[0153] 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.

[0154] 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.

[0155] 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 improving the production cycle.

[0156] 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.

[0157] As some embodiments of the present application, the side 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 .

[0158] 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 facilitating improving the production cycle.

[0159] According to some embodiments of the present application, referring to Figure 7-Figure 9 As shown, the surface of the first terminal body 251 facing the second terminal body 252 has one of the recess 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 recess structure 2524 and the boss structure 2514, and the boss structure 2514 is assembled in the recess structure 2524.

[0160] As some embodiments of this application, refer to Figure 7 As shown, 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.

[0161] As a specific embodiment, refer to Figure 7 As shown, the first terminal body 251 may include a first body segment 2511 and a second body segment 2512 connected to each other, and ... body segment 2512 may include a first body segment 251 Figure 7 The first body segment 2511 and the second body segment 2512 may be arranged in a direction perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction), and the surface of the first body segment 2511 facing the second terminal body 252 may 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, and the first body segment 2511 and the second body segment 2512 may be arranged in a direction perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction). Figure 7 In the direction of the Z direction shown in the figure, the third body segment 2521 and the fourth body segment 2522 can be arranged, and the surface of the fourth body segment 2522 facing the first terminal body 251 can 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, and 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.

[0162] As some embodiments of this application, refer to Figure 8 As shown, 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.

[0163] As a specific embodiment, refer to Figure 8 As shown, the first terminal body 251 may include a first body segment 2511 and a second body segment 2512 connected to each other, and ... body segment 2512 may include a first body segment 251 Figure 7 The first body segment 2511 and the second body segment 2512 may be arranged in a direction perpendicular to the thickness direction of the first wall 21 (i.e., the Z direction), and the surface of the second body segment 2512 facing the second terminal body 252 may 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, and the first wall 21 may be provided with a plurality of body segments 2521 and a plurality of body segments 2522, each of which is ...2 and a plurality of body segments 2524. Figure 7 In the direction of the Z direction shown in the figure, the third body segment 2521 and the fourth body segment 2522 can be arranged, and the surface of the third body segment 2521 facing the first terminal body 251 can 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, and 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.

[0164] In the above technical solution, by making the first terminal body 251 and the second terminal body 252 have a boss structure 2514 and a recessed structure 2524 respectively, the boss structure 2514 and the recessed structure 2524 can play a positioning role, so as to facilitate the first terminal body 251 and the second terminal body 252 to be assembled together, and the boss structure 2514 and the recessed structure 2524 can also play a limiting role, so as to reduce the first terminal body 251 and the second terminal body 252 in the direction perpendicular to the thickness of the first wall 21 (i.e. 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.

[0165] According to some embodiments of the present application, referring to Fig. 9 As shown, the first terminal body 251 has a through hole structure 2515 penetrating the first terminal body 251 along the thickness direction of the first wall 21 .

[0166] Reference Fig. 9 As shown, along the thickness direction of the first wall 21 (ie Figure 7 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 have a first body segment 2511 and a second body segment 2512 connected to each other, and the through hole structure 2515 may penetrate the first terminal body 251. Figure 7 In the Z direction shown in the figure, the second body segment 2512 can be sleeved on the outside of the first body segment 2511, and the first body segment 2511 can have a through hole structure 2515.

[0167] As some embodiments of this application, refer to Fig. 9 As shown, the second terminal body 252 may have a third body segment 2521 and a fourth body segment 2522 connected to each other, and the third body segment 2521 and the fourth body segment 2522 are connected to each other along a direction perpendicular to the thickness direction of the first wall 21 (ie Figure 7 In the Z direction (as shown in the figure), the third body segment 2521 and the fourth body segment 2522 can be arranged, and a part of the structure of the third body segment 2521 can be located in the through hole structure 2515.

[0168] In the above technical solution, by making the first terminal body 251 have 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, which is beneficial to reducing the production cost of the electrode terminal 25. Moreover, by making part of the structure of the third body segment 2521 of the second terminal body 252 located in the through hole structure 2515, it is convenient to assemble the first terminal body 251 and the second terminal body 252 together.

[0169] According to some embodiments of the present application, the electrode terminal 25 is a negative electrode terminal 253 .

[0170] Among them, as some embodiments of the present application, refer to Figure 3 and Figure 4 As shown, the battery cell 20 may include a positive electrode terminal 254 and a negative electrode terminal 253 , both of which may be disposed on the first wall 21 of the battery cell 20 , and the electrode terminal 25 described herein may be the negative electrode terminal 253 of the battery cell 20 .

[0171] 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 bus 30, thereby helping to reduce the production cost of the battery cell 20 and improve the capacity of the battery cell 20.

[0172] As some embodiments of the present application, the electrode terminal 25 described herein may also be a positive electrode terminal 254 .

[0173] According to some embodiments of the present application, the first terminal body 251 and the second terminal body 252 are made of different materials.

[0174] For example, the material of the first terminal body 251 may be aluminum (i.e., the first terminal body 251 may be constructed as an aluminum part), and the material of the second terminal body 252 may be copper (i.e., the second terminal body 252 may be constructed as a copper part), or the material of the first terminal body 251 may be aluminum (i.e., the first terminal body 251 may be constructed as an aluminum part), and the material of the second terminal body 252 may be nickel (i.e., the second terminal body 252 may be constructed as a nickel part).

[0175] In the above technical solution, by making the first terminal body 251 and the second terminal body 252 of different materials, it can adapt to the materials of the adapter 24 and the bus 30, which is beneficial to improve the connection stability between the electrode terminal 25 and the adapter 24 and the bus 30.

[0176] According to some embodiments of the present application, the first terminal body 251 is configured as an aluminum member, and the second terminal body 252 is configured as a copper member.

[0177] 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.

[0178] In the above technical solution, by constructing the first terminal body 251 as an aluminum part and the second terminal body 252 as a copper part, it is helpful to improve the reliability of the electrode terminal 25 and reduce the production cost.

[0179] According to some embodiments of the present application, the present application further provides a battery 100 , which includes a plurality of battery cells 20 in the above embodiments and a bus bar 30 , wherein the bus bar 30 is used to connect the first molten pool area 40 of the plurality of battery cells 20 .

[0180] 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 to the electrical device.

[0181] The power-consuming device may be any of the aforementioned devices or systems using the battery 100 .

[0182] According to some embodiments of the present application, see Figure 8As shown, the present application provides a battery cell 20, which includes: a housing 23, an electrode assembly 22, a connecting piece 24 and an electrode terminal 25.

[0183] Among them, 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.

[0184] 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 with the busbar 30, and the second molten pool area 41 is used to connect with the adapter 24. The electrode terminal 25 includes a first wall 21 along the thickness direction (i.e., Figure 7 The first terminal body 251 and the second terminal body 252 are stacked (in the Z direction shown in the figure), the first terminal body 251 is configured as an aluminum piece, and the second terminal body 252 is configured as a copper piece.

[0185] See also Figure 8 As shown, the first terminal body 251 has a first body section 2511 and a second body section 2512 connected to each other, and is perpendicular to the thickness direction of the first wall 21 (ie Figure 7 In the direction of the Z direction shown in the figure, the first body section 2511 and the second body section 2512 are arranged, and the surface of the first body section 2511 away from the second terminal body 252 has a first welding area 2513, and the first welding area 2513 corresponds to the first molten pool area 40, along the thickness direction of the first wall 21 (i.e. Figure 7 In the Z direction shown in the figure, 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 .

[0186] See also Figure 8 As shown, the second terminal body 252 has a third body section 2521 and a fourth body section 2522 connected to each other, and is perpendicular to the thickness direction of the first wall 21 (ie Figure 7 The third body segment 2521 and the fourth body segment 2522 are arranged in the direction of the Z direction shown in the figure. The surface of the third body segment 2521 away from the first terminal body 251 has a second welding area 2523, and the second welding area 2523 corresponds to the second molten pool area 41. Figure 7The 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 recess structure 2524. The thickness of the third body segment 2521 is greater than the thickness of the fourth body segment 2522.

[0187] A plane is set, which is parallel to the thickness direction of the first wall 21 (i.e. Figure 7 The Z direction shown in FIG. 2 is perpendicular to the thickness direction of the first wall 21 (ie, Figure 7 In the Z direction shown in the figure, the first molten pool area 40 and the second molten pool area 41 both have orthographic projections on this plane, and the orthographic projection of the first molten pool area 40 surrounds the orthographic projection of the second molten pool area 41, that is, the orthographic projection of the first molten pool area 40 is located outside the orthographic projection of the second molten pool area 41, that is, 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 staggered.

[0188] 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 bus bar 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 increase the capacity of the battery cell 20.

[0189] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0190] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: A housing is provided with a receiving cavity, wherein the housing comprises a first wall; An electrode assembly, the electrode assembly is disposed in the accommodating cavity and is provided with a pole ear; An electrode terminal, disposed on the first wall, the electrode terminal being used to connect to a busbar of the battery; A transfer piece, the transfer piece is used to connect the electrode 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, 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 first wall thickness direction.

2. The battery cell according to claim 1, characterized in that: 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 offset.

3. The battery cell according to claim 1, characterized in that: The electrode terminal comprises a first terminal body and a second terminal body stacked along the thickness direction of the first wall, the first terminal body is located at a side of the second terminal body away from the accommodating cavity, the surface of the first terminal body has a first fusion zone corresponding to the first molten pool zone, the surface of the second terminal body has a second fusion zone corresponding to the second molten pool zone, and the first fusion zone and the second fusion zone are staggered along a direction perpendicular to the thickness direction of the first wall; The first terminal body has a first body section and a second body section that are connected, the first body section and the second body section 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 section, and along the thickness direction of the first wall, the thickness of the first body section is greater than the thickness of the second body section.

4. The battery cell according to claim 3, characterized in that: 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, characterized in that: The thickness of the fourth body segment is greater than or equal to 0.1 mm.

6. The battery cell according to claim 3, characterized in that: 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, characterized in that: 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, characterized in that: The second welding zone is constructed in a straight line, and there are two first welding zones, which are located at two opposite sides of the second welding zone.

9. The battery cell according to claim 3, characterized in that: 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, characterized in that: 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, characterized in that: The surface of the first terminal body facing away from the second terminal body comprises the first welding area, and the surface of the second terminal body facing away from the first terminal body comprises the second welding area.

12. The battery cell according to any one of claims 3 to 10, characterized in that: 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 10, characterized in that: 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 10, characterized in that: The first terminal body and the second terminal body are made of different materials.

15. The battery cell according to claim 14, characterized in that: The first terminal body is configured as an aluminum member, and the second terminal body is configured as a copper member.

16. A battery, characterized in that: It comprises a plurality of battery cells as described in 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, characterized in that: The method comprises the battery cell according to any one of claims 1 to 15 or the battery according to claim 14.

Images