Battery cell, battery device, and electric device

Abstract

The application discloses a battery monomer, a battery device and a power utilization device, and belongs to the technical field of batteries. The battery monomer comprises a shell, an electrode terminal, an electrode assembly and an adapter. The shell comprises a first wall; the electrode terminal is arranged on the first wall; the electrode assembly is accommodated in the shell; the adapter is used for electrically connecting a tab of the electrode assembly and the electrode terminal; wherein the electrode terminal is provided with a limiting groove, and one end of the adapter is inserted into the limiting groove. The technical scheme provided by the application can improve the reliability of the battery monomer.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery cell, a battery device, and an electrical device. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In the development of battery technology, in addition to improving battery performance, battery reliability is also an issue that needs to be considered.

[0004] Therefore, improving battery reliability is an urgent problem to be solved in battery technology. Utility Model Content

[0005] This application provides a battery cell, a battery device, and an electrical device, which can effectively improve the reliability of the battery cell.

[0006] In a first aspect, embodiments of this application provide a battery cell, including a housing, electrode terminals, an electrode assembly, and an adapter. The housing includes a first wall; the electrode terminals are disposed on the first wall; the electrode assembly is housed within the housing; the adapter is used to electrically connect the tabs of the electrode assembly and the electrode terminals; wherein the electrode terminals are provided with limiting grooves, and one end of the adapter is inserted into the limiting grooves.

[0007] In the above technical solution, by setting a limiting groove on the electrode terminal and inserting one end of the adapter into the limiting groove, the adapter is limited by the limiting groove during the welding process of the adapter and the electrode terminal, thereby reducing the excessive rotation of the adapter relative to the electrode terminal. This reduces the risk of extrusion interference between the electrode assembly connected to the adapter and the shell, and also reduces the risk of internal short circuit of the battery cell caused by the overlap of the adapter and the shell, which is beneficial to improving the reliability of the battery cell.

[0008] In some embodiments, the opening of the limiting groove is oriented in a first direction, which is perpendicular to the thickness direction of the first wall.

[0009] In the above technical solution, by setting the opening of the limiting groove to a first direction perpendicular to the thickness direction of the first wall, the adapter can be inserted into the limiting groove in a direction parallel to the first wall, reducing the risk of interference between the adapter and structural components (such as insulating components) installed on the inner surface of the first wall. This further reduces the risk of interference between the electrode assembly connected to the adapter and the outer shell due to compression, and further reduces the risk of short circuit inside the battery cell caused by the overlap of the adapter and the outer shell, which is beneficial to further improve the reliability of the battery cell.

[0010] In some embodiments, along the second direction, the limiting groove has a first groove wall and a second groove wall disposed opposite to each other, the first groove wall and the second groove wall respectively abutting against the two sides of the adapter in the second direction, and the first direction, the second direction and the thickness direction of the first wall are perpendicular to each other.

[0011] In the above technical solution, the first and second groove walls abut against the two sides of the adapter in the second direction, respectively. On the one hand, when the adapter and the electrode terminals are welded, the first and second groove walls restrict the adapter, thereby further reducing the risk of the adapter rotating around an axis parallel to the thickness direction of the first wall. This further reduces the risk of interference between the electrode assembly connected to the adapter and the outer casing due to compression, and also further reduces the risk of short circuit inside the battery cell caused by the overlap between the adapter and the outer casing, which is beneficial to further improve the reliability of the battery cell. On the other hand, the connection area between the adapter and the electrode terminals is increased, thereby increasing the current-carrying area between the adapter and the electrode terminals, and thus improving the current-carrying capacity of the battery cell.

[0012] In some embodiments, the electrode terminal has a first side and a second side disposed opposite to each other in the first direction, and the limiting groove extends from the first side to the second side.

[0013] In the above technical solution, the limiting groove extends from the first side to the second side, which facilitates increasing the connection area between the adapter and the electrode terminal by increasing the length of the adapter inserted into the limiting hole, thereby increasing the current flow area between the adapter and the electrode terminal and thus improving the current flow capacity of the battery cell.

[0014] In some embodiments, along the first direction, the limiting groove has a bottom wall, and one end of the adapter abuts against the bottom wall.

[0015] In the above technical solution, by abutting one end of the adapter against the bottom wall of the tank, on the one hand, when the adapter and the electrode terminals are welded, the bottom wall of the tank further restricts the adapter, thereby further reducing the risk of the adapter rotating around an axis parallel to the thickness direction of the first wall. This further reduces the risk of interference between the electrode assembly connected to the adapter and the outer casing due to compression, and also further reduces the risk of short circuits inside the battery cell caused by the overlap of the adapter and the outer casing, which is beneficial to further improving the reliability of the battery cell. On the other hand, it increases the connection area between the adapter and the electrode terminals, thereby increasing the current-carrying area between the adapter and the electrode terminals, and thus improving the current-carrying capacity of the battery cell.

[0016] In some embodiments, the limiting groove has a third groove wall along the thickness direction of the first wall, and one end of the adapter has a first surface facing the first wall, the first surface abutting against the third groove wall.

[0017] In the above technical solution, along the thickness direction of the first wall, the third groove wall abuts against the first surface of the adapter, thereby increasing the connection area between the adapter and the electrode terminal, thereby increasing the current flow area between the adapter and the electrode terminal, and thus improving the current flow capacity of the battery cell.

[0018] In some embodiments, along the thickness direction of the first wall, the limiting groove has a fourth groove wall disposed opposite to the third groove wall, and one end of the adapter has a second surface facing away from the first wall, the second surface abutting against the fourth groove wall.

[0019] In the above technical solution, along the thickness direction of the first wall, the third groove wall abuts against the first surface of the adapter and the fourth groove wall abuts against the second surface of the adapter. On the one hand, when the adapter and the electrode terminal are welded, the third and fourth groove walls restrict the adapter, thereby further reducing the risk of the adapter rotating around an axis perpendicular to the thickness direction of the first wall, thereby further reducing the risk of interference between the electrode assembly connected to the adapter and the housing, and further reducing the risk of internal short circuits in the battery cell caused by the overlap of the adapter and the housing, which is conducive to further improving the reliability of the battery cell. On the other hand, the connection area between the adapter and the electrode terminal is further increased, thereby further increasing the current-carrying area between the adapter and the electrode terminal, and further improving the current-carrying capacity of the battery cell.

[0020] In some embodiments, along the thickness direction of the first wall, the electrode terminal has a first end face facing the electrode assembly and a second end face away from the electrode assembly, and the limiting groove is recessed from the first end face to the second end face.

[0021] In the above technical solution, the limiting groove is recessed from the first end face to the second end face, so that the adapter can be inserted into the limiting groove from the thickness direction of the first wall. On the one hand, it increases the installation methods of the adapter and the limiting groove, which makes it easier to reduce the installation difficulty of the adapter and the electrode terminal. On the other hand, the presence of a fourth groove wall relative to the limiting groove helps to simplify the structure of the electrode terminal, facilitates the manufacturing of the electrode terminal, and also makes it easier to reduce the size of the electrode terminal in the thickness direction of the first wall. This reduces the space occupied by the electrode terminal and the adapter in the shell in the thickness direction of the first wall, which helps to increase the volume of the electrode assembly and thus helps to increase the volumetric energy density of the battery cell.

[0022] In some embodiments, the electrode terminal includes a body and a protrusion. Along the thickness direction of the first wall, the body has a third end face facing the adapter, and the adapter abuts against the third end face. The protrusion protrudes from the third end face and has a first side face along a first direction. A portion of the first side face is recessed to form the limiting groove.

[0023] In the above technical solution, by abutting the adapter with the third end face, the connection area between the adapter and the electrode terminal is further increased, thereby further increasing the current-passing area between the adapter and the electrode terminal, and further improving the current-passing capacity of the battery cell.

[0024] In some embodiments, the adapter includes a first segment and a second segment arranged along the first direction, and the second segment protrudes from the first segment along the second direction to form a stepped surface on the adapter. The first direction, the second direction, and the thickness direction of the first wall are perpendicular to each other. The first segment is accommodated in the limiting groove, and the stepped surface abuts against the first side along the first direction.

[0025] In the above technical solution, by abutting the stepped surface with the first side surface, on the one hand, when the adapter and the electrode terminal are welded, the first side surface restricts the adapter, thereby further reducing the risk of the adapter rotating around an axis parallel to the thickness direction of the first wall, thereby further reducing the risk of interference between the electrode assembly connected to the adapter and the shell due to compression, and further reducing the risk of internal short circuits in the battery cell caused by the overlap of the adapter and the shell, which is conducive to further improving the reliability of the battery cell; on the other hand, it further increases the connection area between the adapter and the electrode terminal, thereby further increasing the current-carrying area between the adapter and the electrode terminal, and further improving the current-carrying capacity of the battery cell.

[0026] In some embodiments, the third end face includes a first region and a second region arranged along the first direction, the protrusion protruding from the first region; along the thickness direction of the first wall, the second region is flush with the third groove wall, and the side of the second segment facing the first wall abuts against the second region.

[0027] In the above technical solution, along the thickness direction of the first wall, the second region is flush with the third groove wall, and the side of the second segment facing the first wall abuts against the second region. That is, along the thickness direction of the first wall, the surface of the second segment facing the first wall is flush with the surface of the first segment facing the first wall. On the one hand, when the adapter and the electrode terminal are welded, the electrode terminal provides more uniform support to the adapter, reducing the risk of the adapter rotating. On the other hand, it reduces the processing difficulty of the adapter, which is conducive to reducing the production cost of the battery cell.

[0028] In some embodiments, the orthographic projection of the second segment onto the body covers the second region along the thickness direction of the first wall.

[0029] In the above technical solution, along the thickness direction of the first wall, the orthogonal projection of the second segment on the body covers the second region, that is, the surface of the second segment facing the first wall can cover the second region, thereby further increasing the connection area between the adapter and the electrode terminal, thereby further increasing the current-carrying area between the adapter and the electrode terminal, and further improving the current-carrying capacity of the battery cell.

[0030] In some embodiments, the battery cell further includes an insulating member, and at least a portion of the insulating member is located between the first wall and the adapter along the thickness direction of the first wall; the electrode terminal includes a conductive member and a terminal post, the conductive member is disposed on the outer surface of the first wall, one end of the terminal post is electrically connected to the conductive member, and the terminal post is provided with the limiting groove; along the thickness direction of the first wall, the other end of the terminal post protrudes from the side of the insulating member facing the adapter.

[0031] In the above technical solution, the other end of the pole protrudes from the side of the insulating component facing the adapter. On the one hand, this provides a setting position for the limiting groove, which facilitates the welding of the adapter and the pole. On the other hand, it gives the pole and the insulating component a larger connection area, which helps to improve the connection strength between the pole and the insulating component, reduces the risk of the pole falling off the first wall, and improves the reliability of the battery cell.

[0032] In some embodiments, the housing includes a shell and a cover plate, the shell having an opening and the cover plate sealing the opening; the first wall is the cover plate, or the first wall is a wall portion of the shell opposite to the cover plate.

[0033] In the above technical solution, the opening design facilitates the placement of the electrode assembly inside the housing, and the cover plate seals the opening to form a sealed space, thereby providing a stable working environment for the electrode assembly and improving the reliability of the battery cell.

[0034] Secondly, embodiments of this application also provide a battery device, including a battery cell as described in any embodiment of the first aspect.

[0035] Thirdly, embodiments of this application also provide an electrical device, which includes a battery cell as described in any embodiment of the first aspect, the battery cell being used to provide electrical energy; or, the electrical device includes a battery device as described in the second aspect, the battery device being used to provide electrical energy. Attached Figure Description

[0036] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments; Figure 2 Exploded views of the structure of the battery device provided in some embodiments of this application; Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application; Figure 4 Exploded view of the structure of a first type of electrode terminal and adapter provided in some embodiments of this application; Figure 5 A schematic diagram of the structure of a first type of electrode terminal and adapter provided in some embodiments of this application; Figure 6 for Figure 5 Sectional view of BB; Figure 7 for Figure 4 A magnified view of a section at point A in the middle; Figure 8 A partial enlarged view of a second type of electrode terminal provided in some embodiments of this application; Figure 9 A cross-sectional view of a third type of electrode terminal and adapter provided for some embodiments of this application; Figure 10 for Figure 5 A magnified view of a section at point C.

[0038] Icons: 1000 - Vehicle; 100 - Battery Unit; 200 - Controller; 300 - Motor; 10 - Housing; 11 - First Housing Body; 12 - Second Housing Body; 20 - Battery Cell; 21 - Housing; 211 - First Wall; 21A - Cover Plate; 21B - Housing; 22 - Electrode Assembly; 221 - First Tab; 222 - Second Tab; 223 - Body; 23 - Electrode Terminal; 23A - First Electrode Terminal; 23B - Second Electrode Terminal; 231 - Body; 2311 - Third End Face; 2311A - First Region; 2311B - Second Region; 232 - Protrusion; 2321 - First Side; 2322-Second side; 233-Conductive component; 234-Pole post; 2301-Limiting groove; 23011-Gutter opening; 23012-First groove wall; 23013-Second groove wall; 23014-Gutter bottom wall; 23015-Third groove wall; 23016-Fourth groove wall; 2302-First end face; 2303-Second end face; 24-Adapter; 24A-First adapter; 24B-Second adapter; 241-First segment; 241A-Step surface; 242-Second segment; 243-Third segment; 25-Insulating component; X-Thickness direction of the first wall; Y-First direction; Z-Second direction. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0041] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0042] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0044] In the embodiments of this application, the same reference numerals denote 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 this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0045] In this application, "multiple" means two or more (including two).

[0046] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0047] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0048] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0049] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, reduces the risk of short circuits while allowing active ions to pass through.

[0050] In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0051] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0052] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0053] As an example, the negative electrode sheet may include a negative current collector and a negative active material disposed on at least one surface of the negative current collector.

[0054] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0055] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0056] In some embodiments, the separator is a separator membrane. The separator membrane can be any known porous structure separator membrane with good chemical and mechanical stability.

[0057] As an example, the material of the separator may include at least one of glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or it may be attached to the surfaces of the positive and negative electrodes.

[0058] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0059] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Liquid electrolytes include electrolyte salts and solvents.

[0060] In some embodiments, the electrode assembly is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0061] In some implementations, the electrode assembly is a stacked structure.

[0062] As an example, multiple positive and negative electrode plates can be set, and multiple positive and multiple negative electrode plates can be stacked alternately.

[0063] As an example, multiple positive electrode sheets can be set, and negative electrode sheets are folded to form multiple stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0064] As an example, both the positive and negative electrode sheets are folded to form multiple stacked folded segments.

[0065] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0066] As an example, the separator can be continuously arranged between any adjacent positive or negative electrode plates by folding or rolling.

[0067] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0068] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0069] The electrode assembly may also include tabs, which are components for conducting current from the electrode assembly. Tabs include a positive tab and a negative tab. Understandably, the positive electrode terminal is used for electrical connection to the positive tab, and the negative electrode terminal is used for electrical connection to the negative tab.

[0070] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0071] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells.

[0072] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity.

[0073] In related technologies, a battery cell generally includes a casing and an electrode assembly. The casing may include a housing and an end cap. The housing has an opening. After the electrode assembly is installed inside the housing, the opening of the housing can be closed by the end cap to form a sealed space inside the housing to accommodate the electrode assembly.

[0074] The housing may have a first wall for mounting electrode terminals, which are used to electrically connect with electrode assemblies to output electrical energy from the battery cells. The electrode terminals may include positive electrode terminals and negative electrode terminals.

[0075] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0076] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0077] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0078] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0079] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0080] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0081] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0082] The following discussion will primarily focus on rectangular battery cells. It should be understood that the embodiments described below are also applicable in some respects to cylindrical battery cells, pouch cell cells, or blade cell cells.

[0083] The development of battery technology must take into account multiple design factors, such as energy density, cycle life, discharge capacity, charge / discharge rate and other performance parameters. In addition, the reliability of the battery device also needs to be considered.

[0084] The adapter is usually connected to the electrode terminal by welding. During the welding process, welding stress and external forces (such as protective gas blowing) can cause the adapter to rotate excessively relative to the electrode terminal. Excessive rotation of the adapter can cause the connected electrode assembly and the shell to be squeezed and interfered. In addition, the excessively rotated adapter may overlap with the shell, resulting in a short circuit and affecting the safety performance of the battery cell.

[0085] In view of this, embodiments of this application provide a battery cell, including a housing, electrode terminals, an electrode assembly, and an adapter. The housing includes a first wall; the electrode terminals are disposed on the first wall; the electrode assembly is housed within the housing; the adapter is used to electrically connect the tabs of the electrode assembly and the electrode terminals; wherein, the electrode terminals are provided with limiting grooves, and one end of the adapter is inserted into the limiting grooves.

[0086] In this type of battery cell, by setting a limiting groove on the electrode terminal and inserting one end of the adapter into the limiting groove, the adapter is limited by the limiting groove during the welding process between the adapter and the electrode terminal. This reduces the excessive rotation of the adapter relative to the electrode terminal, thereby reducing the risk of interference between the electrode assembly connected to the adapter and the outer casing. It also reduces the risk of short circuit inside the battery cell caused by the overlap between the adapter and the outer casing, which helps to improve the reliability of the battery cell.

[0087] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0088] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000; for example, the battery device 100 can serve as the operating power source or general power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0089] In some embodiments of this application, the battery device 100 can not only serve as the operating power or power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0090] Please refer to Figure 2 and Figure 3 , Figure 2 This is an exploded view of the structure of the battery device 100 provided in some embodiments of this application. Figure 3 This is a schematic diagram of the structure of a battery cell 20 provided in some embodiments of this application. The battery device 100 includes a housing 10 and battery cells 20, which are housed within the housing 10.

[0091] The housing 10 provides assembly space for the battery cell 20, and can adopt various structures. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, which overlap each other, and together define an assembly space for accommodating the battery cell 20. The second housing body 12 may be a hollow structure open at one end, and the first housing body 11 may be a plate-like structure, with the first housing body 11 covering the open side of the second housing body 12 so that the first housing body 11 and the second housing body 12 together define the assembly space; alternatively, the first housing body 11 and the second housing body 12 may both be hollow structures open on one side, with the open side of the first housing body 11 covering the open side of the second housing body 12.

[0092] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder, a cuboid, or a cube. For example, in... Figure 2 In the middle, the shape of box 10 is a cuboid.

[0093] In the battery device 100, there can be one or more battery cells 20 disposed within the housing 10. When there are multiple battery cells 20 disposed within the housing 10, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, in parallel, or in a mixed configuration to form a battery module, and then multiple battery modules are connected in series, in parallel, or in a mixed configuration to form a whole, which is then housed within the housing 10.

[0094] In some embodiments, the battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar for connecting multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0095] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be in the form of a cuboid, cylinder, prism, or other shapes. For example, in... Figure 3 In the middle, the battery cell 20 has a cuboid structure.

[0096] According to some embodiments of this application, please refer to Figures 3-6 , Figure 4 This is an exploded view of the structure of the first type of electrode terminal 23 and adapter 24 provided in some embodiments of this application. Figure 5 A schematic diagram of the structure of the first type of electrode terminal 23 and adapter 24 provided in some embodiments of this application. Figure 6 for Figure 5 A cross-sectional view of AA. This application provides a battery cell 20, including a housing 21, electrode terminals 23, an electrode assembly 22, and an adapter 24. The housing 21 includes a first wall 211; the electrode terminals 23 are disposed on the first wall 211; the electrode assembly 22 is housed within the housing 21; the adapter 24 is used to electrically connect the tabs of the electrode assembly 22 and the electrode terminals 23; wherein, the electrode terminals 23 are provided with a limiting groove 2301, and one end of the adapter 24 is inserted into the limiting groove 2301.

[0097] The housing 21 is a component for accommodating the electrode assembly 22. The housing 21 can also be used to accommodate an electrolyte, such as an electrolyte solution. In some embodiments, a receiving cavity is formed inside the housing 21 for accommodating the electrode assembly 22.

[0098] In some embodiments, the material of the housing 21 can be metal or a combination of metal and non-metal. For example, the housing 21 can be made of metal, such as aluminum, copper, iron, steel, or aluminum alloy; or, for example, parts of the housing 21 can be made of metal, while the rest can be made of non-metal, such as the cover plate 21A of the housing 21 being made of metal, while other parts of the housing 21 can be made of non-metallic materials. The housing 21 can be adapted to the shape of the electrode assembly 22. For example, in... Figure 3 In the case of electrode assembly 22 having a cuboid structure, a cuboid shell 21 can be selected.

[0099] In some embodiments, the housing 21 includes a housing 21B and a cover plate 21A. One end of the housing 21B has an opening, allowing the electrode assembly 22 to be placed inside the housing 21B through the opening. The housing 21B may be made of a metallic material, such as aluminum, aluminum alloy, or nickel-plated steel. Two electrode terminals 23 are provided on the cover plate 21A. One of the two electrode terminals 23 is a positive electrode terminal 23, and the other is a negative electrode terminal 23. The housing 21B may be cuboid, cylindrical, or elliptical. Both electrode terminals 23 may be located on the cover plate 21A, both on the housing 21B, or one on the cover plate 21A and the other on the housing 21B.

[0100] The first wall 211 is part of the structure of the outer shell 21. The first wall 211 can be insulated to install the first electrode terminal 23A and the second electrode terminal 23B.

[0101] Both the first electrode terminal 23A and the second electrode terminal 23B are insulated components mounted on the first wall 211. The first electrode terminal 23A and the second electrode terminal 23B are used for electrical connection with the positive and negative terminals of the electrode assembly 22, respectively. This allows current to flow into the electrode assembly 22 through the first electrode terminal 23A and out of the electrode assembly 22 through the second electrode terminal 23B; or, allows current to flow into the electrode assembly 22 through the second electrode terminal 23B and out of the electrode assembly 22 through the first electrode terminal 23A.

[0102] The first wall 211 can be made of conductive materials, such as metals, for example, the first wall 211 can be made of materials such as aluminum, copper, iron, aluminum, steel or aluminum alloy.

[0103] In some embodiments, the first wall 211 may be a cover plate 21A of the outer casing 21, and the housing 21B of the outer casing 21 surrounds the edge of the first wall 211.

[0104] In some embodiments, the first wall 211 may be connected to the housing 21B by welding, bonding, snap-fitting, or other connection methods. In some embodiments, the first wall 211 and the housing 21B may be integrally formed.

[0105] Electrode terminal 23 is used to electrically connect to electrode assembly 22 to output electrical energy from battery cell 20.

[0106] In some embodiments, the electrode terminals 23 may be two terminals spaced apart along a first direction Y on the first wall 211. Each electrode terminal 23 includes a first electrode terminal 23A and a second electrode terminal 23B. Both the first electrode terminal 23A and the second electrode terminal 23B are insulated components mounted on the first wall 211. The first electrode terminal 23A and the second electrode terminal 23B are respectively used for electrical connection to the positive and negative electrodes of the electrode assembly 22. This allows current to flow into the electrode assembly 22 through the first electrode terminal 23A and out of the electrode assembly 22 through the second electrode terminal 23B; or, allows current to flow into the electrode assembly 22 through the second electrode terminal 23B and out of the electrode assembly 22 through the first electrode terminal 23A.

[0107] In some embodiments, the electrode terminal 23 may be a cylindrical structure or a polygonal prism structure.

[0108] In some embodiments, the electrode terminal 23 is made of a metallic material, such as aluminum, copper, iron, steel, alloy or composite metal.

[0109] In some embodiments, the electrode terminal 23 can be mounted on the first wall 211 via an insulating structure.

[0110] Electrode assembly 22 is a component in the battery cell 20 where electrochemical reactions occur. The structure of electrode assembly 22 can be varied; exemplarily, electrode assembly 22 can be a wound structure formed by winding a positive electrode, a separator, and a negative electrode. Exemplarily, the separator is a separator membrane, and the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride.

[0111] In an embodiment where the electrode assembly 22 has a wound structure.

[0112] For example, refer to Figure 3 The outer casing 21 can accommodate one electrode assembly 22 or multiple electrode assemblies 22, with the multiple electrode assemblies 22 stacked together.

[0113] In some embodiments, refer to Figure 3 The electrode assembly 22 includes a body 223, a first electrode tab 221, and a second electrode tab 222. Exemplarily, both the first electrode tab 221 and the second electrode tab 222 are disposed on the surface of the body 223 facing the first wall 211.

[0114] The main body 223 is the area where the electrode assembly 22 undergoes a chemical reaction within the battery cell 20. The main body 223 is a structure formed by winding together the area of ​​the positive electrode sheet coated with a positive active material layer, the separator, and the area of ​​the negative electrode sheet coated with a negative active material layer. It mainly relies on the movement of metal ions between the positive and negative electrode sheets with opposite polarities to work.

[0115] The first tab 221 and the second tab 222 are portions of the electrode assembly 22 used to guide current into the body 223 and out of the body 223, respectively. For example, the first tab 221 is used to guide current into the body 223, and the second tab 222 is used to guide current out of the body 223; or, the second tab 222 is used to guide current into the body 223, and the first tab 221 is used to guide current out of the body 223.

[0116] If the first tab 221 is used as the positive electrode of the input or output electrode assembly 22, then the first tab 221 is a component formed by stacking and connecting the regions on the positive electrode sheet that are not coated with a positive active material layer. Correspondingly, if the second tab 222 is used as the negative electrode of the output or input electrode assembly 22, then the second tab 222 is a component formed by stacking and connecting the regions on the negative electrode sheet that are not coated with a negative active material layer. If the first tab 221 is used as the negative electrode of the output or input electrode assembly 22, then the first tab 221 is a component formed by stacking and connecting the regions on the negative electrode sheet that are not coated with a negative active material layer. Correspondingly, if the second tab 222 is used as the positive electrode of the input or output electrode assembly 22, then the second tab 222 is a component formed by stacking and connecting the regions on the positive electrode sheet that are not coated with a positive active material layer. For example, in the embodiments of this application, the first tab 221 is used as the negative electrode of the output or input electrode assembly 22, and the second tab 222 is used as the positive electrode of the output or input electrode assembly 22.

[0117] The adapter 24 is a component disposed between the electrode tab and the first wall 211, enabling electrical connection between the electrode tab and the electrode terminal 23. The adapter 24 is made of a conductive material, such as copper, iron, aluminum, steel, stainless steel, nickel steel, or aluminum alloy. The connection between the adapter 24 and the electrode tab includes, but is not limited to, welding, bonding, snap-fitting, or other connection methods. The connection between the adapter 24 and the electrode terminal 23 includes, but is not limited to, welding, bonding, snap-fitting, or other connection methods.

[0118] In an embodiment where there are two electrode terminals 23, there are two adapters 24 corresponding to the electrode terminals 23. The two adapters 24 include a first adapter 24A and a second adapter 24B. The first adapter 24A is electrically connected to the first tab 221 and the first electrode terminal 23A, and the second adapter 24B is electrically connected to the second tab 222 and the second electrode terminal 23B.

[0119] The limiting groove 2301 is a groove-shaped structure provided on the electrode terminal 23. It can be understood that the limiting groove 2301 is located inside the housing 21 to facilitate the insertion of the adapter 24.

[0120] For example, the limiting groove 2301 can be formed by machining processes such as milling and drilling, or it can be made simultaneously with the electrode terminal 23 by integral forming processes such as stamping.

[0121] In some embodiments, the limiting groove 2301 is disposed at one end of the electrode terminal 23 in the thickness direction X of the first wall, and the adapter 24 is a bent structure, with one end of the bent member inserted into the limiting groove 2301 along the thickness direction X of the first wall.

[0122] Understandably, one end of the adapter 24 is inserted into the limiting groove 2301, which can initially fix the adapter 24 and the electrode terminal 23, thereby reducing the risk of the adapter 24 and the electrode terminal 23 separating before the adapter 24 is welded to the electrode terminal 23, and helping to simplify the connection process between the adapter 24 and the electrode terminal 23.

[0123] In this embodiment, by providing a limiting groove 2301 on the electrode terminal 23 and inserting one end of the adapter 24 into the limiting groove 2301, the adapter 24 is limited by the limiting groove 2301 during the welding process of the adapter 24 and the electrode terminal 23. This reduces the excessive rotation of the adapter 24 relative to the electrode terminal 23, thereby reducing the risk of extrusion interference between the electrode assembly 22 and the housing 21 connected to the adapter 24. At the same time, it reduces the risk of short circuit inside the battery cell 20 caused by the overlap of the adapter 24 and the housing 23, which is beneficial to improving the reliability of the battery cell 20.

[0124] Please refer to Figure 4 and Figure 7 , Figure 7 for Figure 4 A partial enlarged view of point A. According to some embodiments of this application, the groove 23011 of the limiting groove 2301 is oriented in a first direction Y, which is perpendicular to the thickness direction X of the first wall.

[0125] The slot 23011 of the limiting groove 2301 refers to the opening of the limiting groove 2301 for one end of the adapter 24 to be inserted.

[0126] The first direction Y is a direction perpendicular to the thickness direction of the first wall 211.

[0127] In some embodiments, the opening 23011 of the limiting groove 2301 is oriented in the first direction Y, which is parallel to the width direction of the first wall 211, and the adapter 24 is inserted into the limiting groove 2301 along the thickness direction X of the first wall.

[0128] In some embodiments, the opening 23011 of the limiting groove 2301 is oriented in the first direction Y, which is parallel to the length direction of the first wall 211, and the adapter 24 is inserted into the limiting groove 2301 along the length direction of the first wall 211.

[0129] In this embodiment, by oriented the opening 23011 of the limiting groove 2301 toward the first direction Y, which is perpendicular to the thickness direction X of the first wall, the adapter 24 can be inserted into the limiting groove 2301 in a direction parallel to the first wall 211. This reduces the risk of interference between the adapter 24 and structural components (such as the insulating component 25) mounted on the inner surface of the first wall 211. This further reduces the risk of extrusion interference between the electrode assembly 22 and the housing 21 connected to the adapter 24. At the same time, it further reduces the risk of short circuit inside the battery cell 20 caused by the overlap of the adapter 24 and the housing 21, which is beneficial to further improve the reliability of the battery cell 20.

[0130] Please refer to Figure 4 , Figure 5 and Figure 7 According to some embodiments of this application, along the second direction Z, the limiting groove 2301 has a first groove wall 23012 and a second groove wall 23013 disposed opposite to each other. The first groove wall 23012 and the second groove wall 23013 respectively abut against the two sides of the adapter 24 in the second direction Z. The first direction Y, the second direction Z and the thickness direction X of the first wall are perpendicular to each other.

[0131] The second direction Z is a direction perpendicular to the thickness direction of the first wall 211 and perpendicular to the first direction Y. For example, the first direction Y is parallel to the length direction of the first wall 211, and the second direction Z is parallel to the width direction of the first wall 211; or, the first direction Y is parallel to the width direction of the first wall 211, and the second direction Z is parallel to the length direction of the first wall 211.

[0132] The first groove wall 23012 and the second groove wall 23013 are two groove walls that are arranged opposite to each other in the second direction Z of the limiting groove 2301.

[0133] Understandably, the first groove wall 23012 is a surface adapted to the side of the adapter 24 facing the first groove wall 23012 in the second direction Z, and the second groove wall 23013 is a surface adapted to the side of the adapter 24 facing the second groove wall 23013 in the second direction Z.

[0134] In some embodiments, the sides of the first groove wall 23012 and the adapter 24 facing the first groove wall 23012 in the second direction Z are both planes perpendicular to the second direction Z, and the sides of the second groove wall 23013 and the adapter 24 facing the second groove wall 23013 in the second direction Z are both planes perpendicular to the second direction Z. The length direction of the first groove wall 23012 and the length direction of the second groove wall 23013 are both parallel to the first direction Y, and the width direction of the first groove wall 23012 and the width direction of the second groove wall 23013 are both parallel to the thickness direction X of the first wall.

[0135] In some embodiments, the side of the first groove wall 23012 and the adapter 24 facing the first groove wall 23012 in the second direction Z is an adapted curved surface, and the side of the second groove wall 23013 and the adapter 24 facing the second groove wall 23013 in the second direction Z is an adapted curved surface.

[0136] In this embodiment, the first groove wall 23012 and the second groove wall 23013 abut against the two sides of the adapter 24 in the second direction Z, respectively. On the one hand, when the adapter 24 and the electrode terminal 23 are welded, the first groove wall 23012 and the second groove wall 23013 restrict the adapter 24, thereby further reducing the risk of the adapter 24 rotating around the axis parallel to the thickness direction X of the first wall, thereby further reducing the risk of the electrode assembly 22 and the housing 21 connected to the adapter 24 being squeezed and interfered with, and at the same time further reducing the risk of the adapter 24 and the housing 21 overlapping and causing a short circuit inside the battery cell 20, which is conducive to further improving the reliability of the battery cell 20. On the other hand, the connection area between the adapter 24 and the electrode terminal 23 is increased, thereby increasing the current flow area between the adapter 24 and the electrode terminal 23, and thus improving the current flow capacity of the battery cell 20.

[0137] Please refer to Figure 8 , Figure 8 This is a partial enlarged view of a second type of electrode terminal 23 provided in some embodiments of this application. According to some embodiments of this application, the electrode terminal 23 has a first side surface 2321 and a second side surface 2322 disposed opposite to each other in a first direction Y, and a limiting groove 2301 extends from the first side surface 2321 to the second side surface 2322.

[0138] The first side 2321 and the second side 2322 are two sides of the electrode terminal 23 that are arranged opposite to each other in the first direction Y.

[0139] "The limiting groove 2301 extends from the first side 2321 to the second side 2322", that is, the limiting groove 2301 passes through the electrode terminal 23 along the first direction Y.

[0140] In this embodiment, the limiting groove 2301 extends from the first side 2321 to the second side 2322, thereby facilitating the increase of the connection area between the adapter 24 and the electrode terminal 23 by increasing the length of the adapter 24 inserted into the limiting hole, thereby increasing the current flow area between the adapter 24 and the electrode terminal 23, and thus improving the current flow capacity of the battery cell 20.

[0141] Please refer to Figures 4-7 According to some embodiments of this application, along the first direction Y, the limiting groove 2301 has a groove bottom wall 23014, and one end of the adapter 24 abuts against the groove bottom wall 23014.

[0142] The bottom wall 23014 is the groove wall in the limiting groove 2301 that is opposite to the groove opening 23011 along the first direction Y.

[0143] Understandably, the bottom wall 23014 is a surface adapted to the side of the adapter 24 facing the bottom wall 23014 in the first direction Y.

[0144] In some embodiments, the sides of the bottom wall 23014 and the adapter 24 facing the bottom wall 23014 in the first direction Y are both planes perpendicular to the first direction Y. The length direction of the bottom wall 23014 is parallel to the second direction Z, and the width direction of the bottom wall 23014 is parallel to the thickness direction X of the first wall.

[0145] In some embodiments, the side of the groove bottom wall 23014 and the adapter 24 facing the groove bottom wall 23014 in the first direction Y is an adapted curved surface.

[0146] In this embodiment, by abutting one end of the adapter 24 against the bottom wall 23014 of the tank, on the one hand, when the adapter 24 and the electrode terminal 23 are welded, the bottom wall 23014 further restricts the adapter 24, thereby further reducing the risk of the adapter 24 rotating about an axis parallel to the thickness direction X of the first wall, thereby further reducing the risk of the electrode assembly 22 and the housing 21 connected to the adapter 24 being squeezed and interfered with, and at the same time further reducing the risk of the adapter 24 and the housing 21 overlapping and causing a short circuit inside the battery cell 20, which is beneficial to further improve the reliability of the battery cell 20; on the other hand, the connection area between the adapter 24 and the electrode terminal 23 is increased, thereby increasing the current flow area between the adapter 24 and the electrode terminal 23, and thus improving the current flow capacity of the battery cell 20.

[0147] Please refer to Figures 4-7 According to some embodiments of this application, along the thickness direction X of the first wall, the limiting groove 2301 has a third groove wall 23015, and one end of the adapter 24 has a first surface facing the first wall 211, the first surface abutting against the third groove wall 23015.

[0148] The third groove wall 23015 is a groove wall in the limiting groove 2301 along the thickness direction X of the first wall.

[0149] The first surface is the surface of the adapter 24 facing the first wall 211 in the thickness direction X of the first wall.

[0150] Understandably, the third groove wall 23015 is a surface that is adapted to the first surface.

[0151] In some embodiments, the third groove wall 23015 and the first surface are both planes perpendicular to the thickness direction X of the first wall. The length direction of the third groove wall 23015 is parallel to the first direction Y, and the width direction of the third groove wall 23015 is parallel to the second direction Z.

[0152] In some embodiments, the third groove wall 23015 and the first surface are adapted curved surfaces.

[0153] In this embodiment, along the thickness direction X of the first wall, the third groove wall 23015 abuts against the first surface of the adapter 24, thereby increasing the connection area between the adapter 24 and the electrode terminal 23, thereby increasing the current flow area between the adapter 24 and the electrode terminal 23, and thus improving the current flow capacity of the battery cell 20.

[0154] Please refer to Figure 9 , Figure 9 This is a cross-sectional view of a third electrode terminal 23 and an adapter 24 provided in some embodiments of this application. According to some embodiments of this application, along the thickness direction X of the first wall, the limiting groove 2301 has a fourth groove wall 23016 disposed opposite to the third groove wall 23015, and one end of the adapter 24 has a second surface facing away from the first wall 211, the second surface abutting against the fourth groove wall 23016.

[0155] The fourth groove wall 23016 is a groove wall in the limiting groove 2301 that is disposed opposite to the third groove wall 23015 in the thickness direction X of the first wall. For example, along the thickness direction X of the first wall, the third groove wall 23015 is closer to the first wall 211 than the fourth groove wall 23016.

[0156] The second surface is the surface of the adapter 24 that is away from the first wall 211 in the thickness direction X of the first wall.

[0157] Understandably, the fourth groove wall 23016 is a surface that adapts to the second surface.

[0158] In some embodiments, the fourth groove wall 23016 and the second surface are both planes perpendicular to the thickness direction X of the first wall. The length direction of the fourth groove wall 23016 is parallel to the first direction Y, and the width direction of the fourth groove wall 23016 is parallel to the second direction Z.

[0159] In some embodiments, the fourth groove wall 23016 and the second surface are adapted curved surfaces.

[0160] In this embodiment, along the thickness direction X of the first wall, the third groove wall 23015 abuts against the first surface of the adapter 24 and the fourth groove wall 23016 abuts against the second surface of the adapter 24. On the one hand, when the adapter 24 and the electrode terminal 23 are welded, the third groove wall 23015 and the fourth groove wall 23016 restrict the adapter 24, thereby further reducing the risk of the adapter 24 rotating around the axis perpendicular to the thickness direction X of the first wall, thereby further reducing the risk of the electrode assembly 22 and the housing 21 connected to the adapter 24 being squeezed and interfered with, and at the same time further reducing the risk of the adapter 24 and the housing 21 overlapping and causing a short circuit inside the battery cell 20, which is beneficial to further improve the reliability of the battery cell 20. On the other hand, the connection area between the adapter 24 and the electrode terminal 23 is further increased, thereby further increasing the current-carrying area between the adapter 24 and the electrode terminal 23, and further improving the current-carrying capacity of the battery cell 20.

[0161] Please refer to Figure 5 and Figure 6 According to some embodiments of this application, along the thickness direction X of the first wall, the electrode terminal 23 has a first end face 2302 facing the electrode assembly 22 and a second end face 2303 facing away from the electrode assembly 22, and the limiting groove 2301 is recessed from the first end face 2302 to the second end face 2303.

[0162] The first end face 2302 and the second end face 2303 are two sides of the electrode terminal 23 that are arranged opposite each other in the thickness direction X of the first wall.

[0163] The recessed groove 2301 from the first end face 2302 to the second end face 2303 means that a part of the side of the first end face 2302 is recessed along the direction from the first end face 2302 to the second end face 2303 to form the recessed groove 2301.

[0164] In this embodiment, the limiting groove 2301 is recessed from the first end face 2302 to the second end face 2303, so that the adapter 24 can be inserted into the limiting groove 2301 from the thickness direction X of the first wall. On the one hand, it increases the installation method of the adapter 24 and the limiting groove 2301, which makes it easier to reduce the installation difficulty of the adapter 24 and the electrode terminal 23. On the other hand, the presence of a fourth groove wall 23016 relative to the limiting groove 2301 helps to simplify the structure of the electrode terminal 23, facilitates the manufacturing of the electrode terminal 23, and also makes it easier to reduce the size of the electrode terminal 23 in the thickness direction X of the first wall. This reduces the space occupied by the electrode terminal 23 and the adapter 24 in the thickness direction X of the first wall, thereby helping to increase the volume of the electrode assembly 22, and thus helping to increase the volumetric energy density of the battery cell 20.

[0165] Please refer to Figure 4 and Figure 7According to some embodiments of this application, the electrode terminal 23 includes a body 231 and a protrusion 232. Along the thickness direction X of the first wall, the body 231 has a third end face 2311 facing the adapter 24, and the adapter 24 abuts against the third end face 2311. The protrusion 232 protrudes from the third end face 2311. Along the first direction Y, the protrusion 232 has a first side face 2321, and a portion of the first side face 2321 is recessed to form a limiting groove 2301.

[0166] The body 231 is the part of the main body 223 that connects the electrode terminal 23 to the first wall 211, and the third end face 2311 is the part of the body 231 located inside the outer shell 21.

[0167] The protrusion 232 is the part of the electrode terminal 23 that protrudes from the third end face 2311.

[0168] Understandably, compared to the case where the limiting groove 2301 is set on the body 231, setting the limiting groove 2301 on the protrusion 232 can reduce the risk of the limiting groove 2301 interfering with the connection between the body 231 and the first wall 211, and improve the connection strength between the body 231 and the first wall 211.

[0169] In this embodiment, by abutting the adapter 24 against the third end face 2311, the connection area between the adapter 24 and the electrode terminal 23 is further increased, thereby further increasing the current-carrying area between the adapter 24 and the electrode terminal 23, and further improving the current-carrying capacity of the battery cell 20.

[0170] Please refer to Figure 4 and Figure 5 Please refer to Figure 7 and Figure 10 , Figure 10 for Figure 5 A partial enlarged view at point C. According to some embodiments of this application, the adapter 24 includes a first segment 241 and a second segment 242 arranged along a first direction Y. Along a second direction Z, the second segment 242 protrudes from the first segment 241 to form a stepped surface 241A on the adapter 24. The first direction Y, the second direction Z, and the thickness direction X of the first wall are perpendicular to each other. The first segment 241 is accommodated in a limiting groove 2301. Along the first direction Y, the stepped surface 241A abuts against the first side surface 2321.

[0171] The first segment 241 and the second segment 242 are two parts of the adapter 24 arranged sequentially along the first direction Y.

[0172] In some embodiments, the adapter 24 includes a first segment 241, a second segment 242, and a third segment 243 arranged sequentially along a first direction Y. The first segment 241 is inserted into the limiting groove 2301, the second segment 242 abuts against the third end face 2311, and the third segment 243 is used for electrical connection with the tab of the electrode assembly 22.

[0173] In some embodiments, along the second direction Z, one side of the second segment 242 protrudes beyond one side of the first segment 241, and the other side of the second segment 242 is flush with the other side of the first segment 241.

[0174] In some embodiments, along the second direction Z, the opposite sides of the second segment 242 protrude from the opposite sides of the first segment 241.

[0175] In this embodiment, by abutting the stepped surface 241A against the first side surface 2321, on the one hand, when the adapter 24 and the electrode terminal 23 are welded, the first side surface 2321 restricts the adapter 24, thereby further reducing the risk of the adapter 24 rotating around an axis parallel to the thickness direction X of the first wall, thereby further reducing the risk of the electrode assembly 22 and the housing 21 connected to the adapter 24 being squeezed and interfered with, and at the same time further reducing the risk of the adapter 24 and the housing 21 overlapping and causing a short circuit inside the battery cell 20, which is beneficial to further improve the reliability of the battery cell 20; on the other hand, it further increases the connection area between the adapter 24 and the electrode terminal 23, thereby further increasing the current-carrying area between the adapter 24 and the electrode terminal 23, and further improving the current-carrying capacity of the battery cell 20.

[0176] Please refer to Figure 7 According to some embodiments of this application, the third end face 2311 includes a first region 2311A and a second region 2311B arranged along the first direction Y, and a protrusion 232 protrudes from the first region 2311A; along the thickness direction X of the first wall, the second region 2311B is flush with the third groove wall 23015, and the side of the second segment 242 facing the first wall 211 abuts against the second region 2311B.

[0177] The first region 2311A is the region where the third end face 2311 is provided with the protrusion 232, and the second region 2311B is the region where the third end face 2311 is not provided with the protrusion 232.

[0178] In this embodiment, along the thickness direction X of the first wall, the second region 2311B is flush with the third trench wall 23015, and the side of the second segment 242 facing the first wall 211 abuts against the second region 2311B. That is, along the thickness direction X of the first wall, the surface of the second segment 242 facing the first wall 211 is flush with the surface of the first segment 241 facing the first wall 211. On the one hand, when the adapter 24 and the electrode terminal 23 are welded, the electrode terminal 23 provides more uniform support to the adapter 24, reducing the risk of the adapter 24 rotating. On the other hand, it reduces the processing difficulty of the adapter 24, which is beneficial to reducing the production cost of the battery cell 20.

[0179] Please refer to Figure 7 and Figure 10 According to some embodiments of this application, along the thickness direction X of the first wall, the orthographic projection of the second segment 242 on the body 231 covers the second region 2311B.

[0180] In this embodiment, along the thickness direction X of the first wall, the orthogonal projection of the second segment 242 on the body 231 covers the second region 2311B, that is, the surface of the second segment 242 facing the first wall 211 can cover the second region 2311B, thereby further increasing the connection area between the adapter 24 and the electrode terminal 23, thereby further increasing the current-carrying area between the adapter 24 and the electrode terminal 23, and further improving the current-carrying capacity of the battery cell 20.

[0181] According to some embodiments of this application, the battery cell 20 further includes an insulating member 25, and at least a portion of the insulating member 25 is located between the first wall 211 and the adapter 24 along the thickness direction X of the first wall; the electrode terminal 23 includes a conductive member 233 and a terminal post 234, the conductive member 233 is disposed on the outer surface of the first wall 211, one end of the terminal post 234 is electrically connected to the conductive member 233, and the terminal post 234 is provided with a limiting groove 2301; along the thickness direction X of the first wall, the other end of the terminal post 234 protrudes from the side of the insulating member 25 facing the adapter 24.

[0182] An insulating member 25 is disposed between the electrode assembly 22 and the first wall 211. The insulating member 25 has insulating properties and is capable of insulating and isolating the first wall 211 and the electrode assembly 22. For example, the insulating member 25 may be the lower plastic of the battery cell 20.

[0183] In some embodiments, the insulating element 25 may be in the form of a sheet, plate, or ring.

[0184] In some embodiments, the insulating element 25 may be a rubber element, a silicone element, or a plastic element, etc.

[0185] In some embodiments, the insulating element 25 is made of an insulating material, such as polypropylene, polyethylene, or other materials with insulating properties.

[0186] The connection between the insulating component 25 and the first wall 211 includes, but is not limited to, injection molding, bonding, snap-fitting, or other connection methods such as other connecting components.

[0187] In some embodiments, the adapter 24 abuts against the insulator 25 along the thickness direction X of the first wall.

[0188] The conductive element 233 is a component mounted on the first wall 211. The conductive element 233 is used to electrically connect to the electrode assembly 22 via the pole post 234, so that current flows into or out of the electrode assembly 22 through the conductive element 233 and the pole post 234.

[0189] In some embodiments, the conductive element 233 may be a cylindrical structure or a polygonal prism structure. In some embodiments, the conductive element 233 may be made of a metallic material, such as aluminum, copper, iron, steel, alloy, or composite metal.

[0190] In this embodiment, the other end of the pole post 234 protrudes from the side of the insulating member 25 facing the adapter 24. On the one hand, this provides a setting position for the limiting groove 2301, which facilitates the welding of the adapter 24 and the pole post 234. On the other hand, it gives the pole post 234 and the insulating member 25 a larger connection area, which helps to improve the connection strength between the pole post 234 and the insulating member 25, reduces the risk of the pole post 234 falling off the first wall 211, and improves the reliability of the battery cell 20.

[0191] Please refer to Figure 3 According to some embodiments of this application, the outer casing 21 includes a housing 21B and a cover plate 21A. The housing 21B has an opening, and the cover plate 21A seals the opening. The first wall 211 is the cover plate 21A, or the first wall 211 is the wall portion of the housing 21B opposite to the cover plate 21A.

[0192] The housing 21B is a component used to house the electrode assembly 22.

[0193] The cover plate 21A is a component that covers the opening of the housing 21B to isolate the internal environment of the battery cell 20 from the external environment.

[0194] Understandably, the shape of the cover plate 21A can be adapted to the shape of the shell 21B. For example, if the shell 21B is a cuboid structure, the cover plate 21A can be a rectangular plate structure adapted to the shell 21B. The material of the cover plate 21A can also be various, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the cover plate 21A and the shell 21B can be the same or different.

[0195] In this embodiment, the opening design facilitates the placement of the electrode assembly 22 within the housing 21B, with the cover plate 21A sealing the opening to form a sealed space, thereby providing a stable working environment for the electrode assembly 22 and improving the reliability of the battery cell 20.

[0196] According to some embodiments of this application, a battery device 100 is also provided, which includes the battery cell 20 provided above.

[0197] Among them, reference Figure 2 As shown, the battery device 100 may also include a housing 10, in which the battery cells 20 are housed.

[0198] According to some embodiments of this application, the housing 10 may include a first housing body 11 and a second housing body 12, the first housing body 11 and the second housing body 12 covering each other, and the first housing body 11 and the second housing body 12 together defining an assembly space for accommodating the battery cell 20.

[0199] Optionally, 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 together 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.

[0200] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder or a cuboid. For example, see [reference]. Figure 2 Box 10 has a rectangular structure.

[0201] Optionally, the battery cell 20 disposed within the housing 10 can be one or more. For example, see [reference]. Figure 2 The battery device 100 has multiple battery cells 20 installed inside its housing 10. These battery cells 20 can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that some of the battery cells 20 are connected in series and others in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed inside the housing 10.

[0202] The battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar component that connects multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0203] It should be noted that, according to some embodiments of this application, the battery device 100 may not have a housing 10. The battery device 100 includes multiple battery cells 20, and the battery device 100 composed of multiple battery cells 20 can be directly mounted onto an electrical device to provide electrical energy to the electrical device through the multiple battery cells 20. That is, the housing 10 can be part of the electrical device. Taking a vehicle 1000 as an example, the housing 10 can be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 can be at least a part of the floor of the vehicle 1000, or a portion of the housing 10 can be at least a part of the crossbeams and longitudinal beams of the vehicle 1000.

[0204] According to some embodiments of this application, some embodiments of this application also provide an electrical device, which includes a battery cell 20 as described above, the battery cell 20 being used to provide electrical energy.

[0205] According to some embodiments of this application, please refer to Figures 3-10 A battery cell 20 is provided, comprising a housing 21, electrode terminals 23, electrode assemblies 22, and an adapter 24. The housing 21 includes a first wall 211; the electrode terminals 23 are disposed on the first wall 211; the electrode assembly 22 is housed within the housing 21; the adapter 24 is used to electrically connect the tabs of the electrode assembly 22 and the electrode terminals 23; wherein the electrode terminals 23 are provided with limiting grooves 2301, and one end of the adapter 24 is inserted into the limiting grooves 2301. The opening 23011 of the limiting grooves 2301 is oriented in a first direction Y, which is perpendicular to the thickness direction X of the first wall. Along a second direction Z, the limiting grooves 2301 have opposing first groove walls 23012 and second groove walls 23013, which respectively abut against both sides of the adapter 24 in the second direction Z. The first direction Y, the second direction Z, and the thickness direction X of the first wall are all perpendicular to each other.

[0206] In some embodiments, the electrode terminal 23 has a first side 2321 and a second side 2322 disposed opposite to each other in the first direction Y, and the limiting groove 2301 extends from the first side 2321 to the second side 2322.

[0207] In other embodiments, along the first direction Y, the limiting groove 2301 has a groove bottom wall 23014, and one end of the adapter 24 abuts against the groove bottom wall 23014.

[0208] Along the thickness direction X of the first wall, the limiting groove 2301 has a third groove wall 23015, and one end of the adapter 24 has a first surface facing the first wall 211, the first surface abutting against the third groove wall 23015.

[0209] In some embodiments, along the thickness direction X of the first wall, the limiting groove 2301 has a fourth groove wall 23016 disposed opposite to the third groove wall 23015, and one end of the adapter 24 has a second surface away from the first wall 211, the second surface abutting against the fourth groove wall 23016.

[0210] In other embodiments, along the thickness direction X of the first wall, the electrode terminal 23 has a first end face 2302 facing the electrode assembly 22 and a second end face 2303 facing away from the electrode assembly 22, and the limiting groove 2301 is recessed from the first end face 2302 to the second end face 2303.

[0211] The electrode terminal 23 includes a body 231 and a protrusion 232. Along the thickness direction X of the first wall, the body 231 has a third end face 2311 facing the adapter 24, and the adapter 24 abuts against the third end face 2311. The protrusion 232 protrudes from the third end face 2311. Along the first direction Y, the protrusion 232 has a first side face 2321, and a portion of the first side face 2321 is recessed to form a limiting groove 2301. The adapter 24 includes a first segment 241 and a second segment 242 arranged along the first direction Y. Along the second direction Z, the second segment 242 protrudes from the first segment 241 to form a stepped surface 241A on the adapter 24. The first direction Y, the second direction Z, and the thickness direction X of the first wall are perpendicular to each other. The first segment 241 is accommodated in the limiting groove 2301, and along the first direction Y, the stepped surface 241A abuts against the first side face 2321. The third end face 2311 includes a first region 2311A and a second region 2311B arranged along the first direction Y. A protrusion 232 protrudes from the first region 2311A. Along the thickness direction X of the first wall, the second region 2311B is flush with the third groove wall 23015, and the side of the second segment 242 facing the first wall 211 abuts against the second region 2311B. Along the thickness direction X of the first wall, the orthographic projection of the second segment 242 onto the body 231 covers the second region 2311B.

[0212] The battery cell 20 also includes an insulating member 25. Along the thickness direction X of the first wall, at least a portion of the insulating member 25 is located between the first wall 211 and the adapter 24. The electrode terminal 23 includes a conductive member 233 and a terminal post 234. The conductive member 233 is disposed on the outer surface of the first wall 211. One end of the terminal post 234 is electrically connected to the conductive member 233. The terminal post 234 is provided with a limiting groove 2301. Along the thickness direction X of the first wall, the other end of the terminal post 234 protrudes from the side of the insulating member 25 facing the adapter 24.

[0213] The outer casing 21 includes a housing 21B and a cover plate 21A. The housing 21B has an opening, and the cover plate 21A seals the opening. The first wall 211 is the cover plate 21A, or the first wall 211 is the wall portion of the housing 21B opposite to the cover plate 21A.

[0214] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0215] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit this application. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: The outer shell, including the first wall; Electrode terminals are disposed on the first wall; Electrode assembly, housed within the housing; An adapter for electrically connecting the tabs of the electrode assembly and the electrode terminals; The electrode terminal is provided with a limiting groove, and one end of the adapter is inserted into the limiting groove.

2. The battery cell as described in claim 1, characterized in that, The opening of the limiting groove is oriented in a first direction, which is perpendicular to the thickness direction of the first wall.

3. The battery cell as described in claim 2, characterized in that, Along the second direction, the limiting groove has a first groove wall and a second groove wall arranged opposite to each other. The first groove wall and the second groove wall respectively abut against the two sides of the adapter in the second direction. The first direction, the second direction and the thickness direction of the first wall are perpendicular to each other.

4. The battery cell as described in claim 3, characterized in that, The electrode terminal has a first side and a second side that are disposed opposite to each other in the first direction, and the limiting groove extends from the first side to the second side.

5. The battery cell as described in claim 3, characterized in that, Along the first direction, the limiting groove has a bottom wall, and one end of the adapter abuts against the bottom wall of the groove.

6. The battery cell as described in claim 2, characterized in that, Along the thickness direction of the first wall, the limiting groove has a third groove wall, and one end of the adapter has a first surface facing the first wall, the first surface abutting against the third groove wall.

7. The battery cell as described in claim 6, characterized in that, Along the thickness direction of the first wall, the limiting groove has a fourth groove wall disposed opposite to the third groove wall, and one end of the adapter has a second surface facing away from the first wall, the second surface abutting against the fourth groove wall.

8. The battery cell as described in claim 6, characterized in that, Along the thickness direction of the first wall, the electrode terminal has a first end face facing the electrode assembly and a second end face away from the electrode assembly, and the limiting groove is recessed from the first end face to the second end face.

9. The battery cell as described in claim 6, characterized in that, The electrode terminal includes a body and a protrusion. Along the thickness direction of the first wall, the body has a third end face facing the adapter, and the adapter abuts against the third end face. The protrusion protrudes from the third end face, and along the first direction, the protrusion has a first side surface, a portion of which is recessed to form the limiting groove.

10. The battery cell as described in claim 9, characterized in that, The adapter includes a first segment and a second segment arranged along the first direction. Along the second direction, the second segment protrudes from the first segment to form a stepped surface on the adapter. The first direction, the second direction, and the thickness direction of the first wall are perpendicular to each other. The first segment is accommodated in the limiting groove, and along the first direction, the stepped surface abuts against the first side surface.

11. The battery cell as described in claim 10, characterized in that, The third end face includes a first region and a second region arranged along the first direction, and the protrusion protrudes from the first region; Along the thickness direction of the first wall, the second region is flush with the third groove wall, and the side of the second segment facing the first wall abuts against the second region.

12. The battery cell as described in claim 11, characterized in that, Along the thickness direction of the first wall, the orthographic projection of the second segment onto the body covers the second region.

13. The battery cell as described in claim 1, characterized in that, The battery cell also includes an insulating component, and at least a portion of the insulating component is located between the first wall and the adapter along the thickness direction of the first wall. The electrode terminal includes a conductive element and a pole post. The conductive element is disposed on the outer surface of the first wall, one end of the pole post is electrically connected to the conductive element, and the pole post is provided with the limiting groove. Along the thickness direction of the first wall, the other end of the pole protrudes from the side of the insulating member facing the adapter.

14. The battery cell as described in claim 1, characterized in that, The outer casing includes a housing and a cover plate, the housing having an opening and the cover plate sealing the opening; The first wall is the cover plate, or the first wall is the wall portion of the housing opposite to the cover plate.

15. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-14.

16. An electrical appliance, characterized in that, Includes a battery cell according to any one of claims 1-14, the battery cell being used to provide electrical energy.

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