Battery cell, battery device, and electric device

Abstract

The application provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, an electrode assembly and an electrode terminal. The shell comprises a first wall. The electrode assembly is accommodated in the shell. The electrode terminal is arranged on the first wall. The electrode terminal comprises a conductive part, an insulating part and a first positioning mechanism. The conductive part is electrically connected with the electrode assembly, so that the electrode terminal can form conduction with external devices. The insulating part is arranged around the conductive part and connected with the first wall, so that the electrode terminal and the shell are stably connected, and the conductive part and the first wall are insulated. The first positioning mechanism is arranged on the outer surface of the insulating part, so that the positioning mechanism does not need to be arranged on the conductive part during the welding and positioning of the busbar and the conductive part. The problem that the contact area between the conductive part and the busbar is reduced and the overcurrent capacity is insufficient when the positioning mechanism is arranged on the conductive part is solved, and the reliability of the battery monomer is improved.

Description

Technical Field

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

[0002] Battery devices are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0003] Battery devices typically contain multiple battery cells, which are usually connected in series or parallel by welding with plates. The plates are connected to the terminals of the battery cells. How to improve the current-carrying capacity between the plates and the terminals, and enhance the current-carrying performance of the battery cells, is a technical problem that urgently needs to be solved. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device that can improve the current flow capacity between the battery cell and the terminal post, thereby enhancing the current flow performance of the battery cell.

[0005] In a first aspect, this application provides a battery cell, comprising: a housing including a first wall; an electrode assembly housed within the housing; and an electrode terminal disposed on the first wall, the electrode terminal including a conductive portion, an insulating portion, and a first positioning mechanism, the conductive portion being electrically connected to the electrode assembly, the insulating portion being disposed around the conductive portion and connected to the first wall, and the first positioning mechanism being disposed on the outer surface of the insulating portion.

[0006] In the embodiments of this application, the battery cell includes a housing, an electrode assembly, and electrode terminals. The housing includes a first wall, the electrode assembly is housed within the housing, and the electrode terminals are disposed on the first wall. Each electrode terminal includes a conductive portion, an insulating portion, and a first positioning mechanism. The conductive portion and the electrode assembly are electrically connected so that the electrode terminals can conduct to external devices. The insulating portion is disposed around the conductive portion and connected to the first wall, which can both ensure a stable connection between the electrode terminals and the housing and insulate the conductive portion from the first wall. By disposing the first positioning mechanism on the outer surface of the insulating portion, it is not necessary to place the positioning mechanism on the conductive portion during the welding and positioning process of the busbar and the conductive portion. This improves the problem of reduced contact area and insufficient overcurrent capacity when the positioning mechanism is placed on the conductive portion, thereby enhancing the reliability of the battery cell.

[0007] In some embodiments, the electrode terminals include at least two first positioning mechanisms spaced apart, or the first positioning mechanisms are arranged around the conductive portion.

[0008] In the embodiments of this application, at least two first positioning mechanisms are arranged at intervals, which helps to reduce the risk of relative deflection between the bus and the conductive part. Alternatively, the first positioning mechanisms are arranged around the conductive part, increasing the area of ​​the first positioning mechanisms and helping to improve the reliability of the first positioning mechanisms.

[0009] In some embodiments, the first positioning mechanism is disposed on the side of the insulating portion away from the first wall.

[0010] In the embodiment of this application, the operable area on the side of the insulating part away from the first wall is large, which reduces the difficulty of setting up the first positioning mechanism.

[0011] In some embodiments, the first positioning mechanism includes a first color, and the insulating part includes a second color, wherein the first color and the second color are different.

[0012] In the solution of this application embodiment, by setting the first positioning mechanism and the insulating part to different colors, the recognizability of the first positioning mechanism is improved, so as to facilitate the busbar to complete the positioning through the first positioning mechanism, and the problem of the insulation part structural strength being reduced due to setting the first positioning mechanism is also improved.

[0013] In some embodiments, the first positioning mechanism includes a positioning protrusion disposed on the insulating portion.

[0014] In the embodiment of this application, the first positioning mechanism includes a positioning protrusion disposed on the outer surface of the insulating part to improve the recognizability of the first positioning mechanism, facilitate the busbar to complete the positioning through the first positioning mechanism, improve the problem of reduced structural strength of the insulating part caused by the setting of the first positioning mechanism, and help to enhance the connection reliability between the first positioning mechanism and the insulating part.

[0015] In some embodiments, the first positioning mechanism includes a positioning groove disposed on the insulating portion.

[0016] In the embodiment of this application, the first positioning mechanism includes a positioning groove disposed on the outer surface of the insulating part, so as to improve the recognizability of the first positioning mechanism, facilitate the busbar to complete the positioning through the first positioning mechanism, and reduce the difficulty of setting the first positioning mechanism.

[0017] In some embodiments, the positioning groove and the edge of the insulating portion are spaced apart.

[0018] In the embodiments of this application, the positioning groove and the edge of the insulating part are spaced apart to improve the problem that the positioning groove reduces the structural strength of the insulating part.

[0019] In some embodiments, the minimum distance L between the positioning groove and the edge of the insulating part satisfies L≥0.5mm.

[0020] In the embodiments of this application, when the minimum distance between the positioning groove and the edge of the insulating part meets the above requirements, the risk of the insulating part having too low structural strength due to the setting of the positioning groove is reduced.

[0021] Secondly, embodiments of this application provide a battery device, including a busbar and a battery cell according to any of the embodiments of the first aspect above. The busbar includes a body and a second positioning mechanism. The body and a conductive part are connected. At least a portion of the second positioning mechanism is in contact with the first positioning mechanism in the orthographic projection of the insulating part.

[0022] In the embodiment of this application, the busbar includes a body and a second positioning mechanism. The body and the conductive part are connected so that adjacent battery cells can be electrically connected through the busbar. At least part of the second positioning mechanism is in contact with the first positioning mechanism on the orthographic projection of the insulating part to achieve the positioning of the busbar and the electrode terminals. By setting the first positioning mechanism on the outer surface of the insulating part, it is not necessary to set the positioning mechanism on the conductive part during the welding and positioning process of the busbar and the conductive part. This improves the problem of reduced contact area between the conductive part and the busbar and insufficient current carrying capacity when the positioning mechanism is set on the conductive part, thereby improving the reliability of the battery cells.

[0023] In some embodiments, the first positioning mechanism is disposed on the side of the insulating portion away from the first wall, the body is disposed on the end of the conductive portion away from the electrode assembly, and the first positioning mechanism is disposed between the body and the first wall.

[0024] In the embodiment of this application, the first positioning mechanism is disposed between the body and the first wall to facilitate the positioning of the busbar and the electrode terminal, which helps to improve the connection reliability of the busbar and the electrode terminal.

[0025] In some embodiments, the busbar includes at least two second positioning mechanisms, which are spaced apart on the body.

[0026] In the embodiments of this application, at least two second positioning mechanisms are spaced apart on the body, which helps to reduce the risk of relative deflection between the bus and the conductive part, and helps to improve the connection reliability between the bus and the electrode terminal.

[0027] In some embodiments, the second positioning mechanism includes a positioning hole that extends through the body.

[0028] In the embodiment of this application, the second positioning mechanism includes a positioning hole that penetrates the body. The first positioning mechanism can be easily observed through the positioning hole, which not only helps to reduce the difficulty of setting the second positioning mechanism, but also improves the alignment reliability of the electrode terminals and the bus.

[0029] In some embodiments, the diameter D1 of the positioning hole and the dimension D2 of the first positioning mechanism in the radial direction of the conductive part satisfy D2 < D1.

[0030] In the embodiment of this application, when the diameter D1 of the positioning hole and the dimension D2 of the first positioning mechanism in the radial direction of the pole post meet the above conditions, it is convenient to observe the two sides of the first positioning mechanism through the positioning hole, thereby improving the positioning accuracy of the first positioning mechanism and the second positioning mechanism.

[0031] Thirdly, embodiments of this application provide an electrical device, including the battery device of any of the embodiments of the second aspect described above. Attached Figure Description

[0032] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0033] Figure 1 This is a schematic diagram of the structure of a vehicle provided in one embodiment of this application;

[0034] Figure 2 This is a schematic diagram of the structure of a battery device provided in an embodiment of this application;

[0035] Figure 3 This is a schematic diagram of the structure of a battery module provided in one embodiment of the application;

[0036] Figure 4 This is an exploded view of a single battery cell provided in an embodiment of this application;

[0037] Figure 5 This is a schematic diagram of the electrode terminal structure of a battery cell provided in an embodiment of this application;

[0038] Figure 6 yes Figure 5 Sectional view at point AA;

[0039] Figure 7 This is a schematic diagram of the structure of the electrode terminals of a battery device provided in an embodiment of this application;

[0040] Figure 8 This is a schematic diagram of the structure of the electrode terminals of a battery device provided in another embodiment of this application;

[0041] Figure 9 This is a schematic diagram of the structure of the electrode terminals of a battery device provided in another embodiment of this application;

[0042] Figure 10 This is a partial structural schematic diagram of the electrode terminals of a battery device provided in an embodiment of this application;

[0043] Figure 11This is a schematic diagram of the structure of a battery device provided in an embodiment of this application;

[0044] Figure 12 This is a partial structural schematic diagram of a battery device provided in one embodiment of this application;

[0045] Figure 13 This is a schematic diagram of the structure of a battery device provided in an embodiment of this application;

[0046] Figure 14 yes Figure 13 A magnified structural diagram at point B in the middle.

[0047] Figure label:

[0048] 1. Vehicle; 101. Motor; 102. Controller; 2. Battery Unit; 201. Battery Module; 202. Housing; 2021. First Housing; 2022. Second Housing;

[0049] 3. Battery cells;

[0050] 4. Shell; 41. First wall;

[0051] 5. Electrode assembly; 51. Electrode tab; 52. Electrode body;

[0052] 61. Electrode terminal; 611. Insulating part; 612. Conductive part; 613. Welding part;

[0053] 71. First positioning mechanism; 711. Positioning protrusion; 712. Positioning groove;

[0054] 8. Busbar; 81. Body; 82. Second positioning mechanism; 821. Positioning hole. Detailed Implementation

[0055] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0056] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0057] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0058] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0059] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0060] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0061] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0062] Battery devices typically contain multiple battery cells, which are usually connected in series or parallel by welding with plates. The plates are welded to the conductive parts of the battery cells, and the current-carrying capacity between the plates and the conductive parts still needs to be improved.

[0063] The reason for the above problem is that, in order to improve the welding accuracy between the electrode and the conductive part during the welding process, a positioning mechanism must be set on both the conductive part and the electrode. However, the positioning mechanism set on the conductive part will reduce the weldable area between the conductive part and the electrode, reduce the current flow area between the conductive part and the electrode, and reduce the current flow capacity.

[0064] To address the aforementioned issues, this application provides a battery cell comprising a housing, an electrode assembly, and electrode terminals. The housing includes a first wall, the electrode assembly is housed within the housing, and the electrode terminals are disposed on the first wall. Each electrode terminal includes a conductive portion, an insulating portion, and a first positioning mechanism. The conductive portion is electrically connected to the electrode assembly, enabling the electrode terminals to conduct electricity with external devices. The insulating portion is disposed around the conductive portion and connected to the first wall, thus ensuring a stable connection between the electrode terminals and the housing while also insulating the conductive portion from the first wall. By placing the first positioning mechanism on the outer surface of the insulating portion, it is unnecessary to place the positioning mechanism on the conductive portion during the welding and positioning process of the busbar and the conductive portion. This improves the problem of reduced contact area and insufficient current carrying capacity when the positioning mechanism is placed on the conductive portion, thereby enhancing the reliability of the battery cell.

[0065] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0066] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0067] 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.

[0068] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this application embodiment is not limited to this. The battery cell can be cylindrical, flat, cuboid, or other shapes, and this application embodiment is not limited to this either.

[0069] The battery device 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. For example, the battery device mentioned in this application may include a battery module or a battery pack. A battery pack generally includes a housing for encapsulating one or more battery cells. The housing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0070] A single battery cell includes electrode components and an electrolyte. The electrode components include a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode components. The positive electrode includes a positive current collector and a positive active material layer, the latter coated on the surface of the current collector. The current collector includes a positive current-collecting section and a positive electrode tab connected to it. The current-collecting section is coated with the positive active material layer, while the tab is not. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material layer includes the positive active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet includes a negative current collector and a negative active material layer, the negative active material layer being coated on the surface of the negative current collector. The negative current collector includes a negative current collection section and a negative electrode tab connected to the negative current collection section. The negative current collection section is coated with the negative active material layer, while the negative electrode tab is not coated with the negative active material layer. The material of the negative current collector can be copper, and the negative active material layer includes negative active material, which can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0071] It should be understood that the technical solutions described in the embodiments of this application are not limited to the battery devices and electrical equipment described above, but can also be applied to all battery devices including housings and electrical equipment using battery devices. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0072] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle 1 provided in some embodiments of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery device 2 is installed inside vehicle 1, and the battery device 2 can be located at the bottom, front, or rear of vehicle 1. The battery device 2 can be used to power vehicle 1; for example, the battery device 2 can serve as the operating power source for vehicle 1. Vehicle 1 may also include a controller 102 and a motor 101. The controller 102 is used to control the battery to supply power to the motor 101, for example, to meet the power needs of vehicle 1 during starting, navigation, and driving.

[0073] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0074] Figure 2 A schematic diagram of the structure of a battery device according to an embodiment of this application is shown.

[0075] The battery device 2 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 3, which are connected in series, parallel, or mixed connections via a busbar.

[0076] In some embodiments, the battery cell assembly is typically formed by arranging a plurality of battery cells 3.

[0077] As an example, the battery cell assembly can be a battery module 201, which is formed by arranging and fixing multiple battery cells 3 to form an independent module. As an example, the battery module 201 can be formed by binding multiple battery cells 3 together with cable ties.

[0078] In some embodiments, the battery device may be a battery pack, which includes a housing 202 and one or more battery cell assemblies housed in the housing 202.

[0079] As an example, the battery cell assembly can be a battery module 201, which can be housed in a housing 202 by fixing the battery module 201 in the housing.

[0080] As an example, the battery cell assembly can also be housed in the housing 202 by directly fixing multiple battery cells 3 to the housing 202.

[0081] As an example, the housing 202 may include a first housing 2021 and a second housing 2022. The first housing 2021 and the second housing 2022 are fastened together, forming a closed space inside the housing 202 to house the battery cell assembly. Here, "closed" refers to covering or closing, which can be sealed or unsealed. The first housing 2021 may be an end cap or a bottom plate.

[0082] As an example, the housing 202 may include an end cap, a frame, and a base plate. The end cap and the base plate are respectively connected to the frame, so that the interior of the housing 202 forms an enclosed space to accommodate the battery cell assembly.

[0083] In some embodiments, the housing 202 may be part of the vehicle's chassis structure. For example, a portion of the housing 202 may be at least a portion of the vehicle's floor, or a portion of the housing 202 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0084] Figure 3 A schematic diagram of the structure of a battery module 201 according to an embodiment of this application is shown.

[0085] In some embodiments, such as Figure 2 and Figure 3 As shown, there are multiple battery cells 3. These multiple battery cells 3 are first connected in series, parallel, or in a mixed manner to form a battery module 201. The multiple battery modules 201 are then connected in series, parallel, or in a mixed manner to form a whole, which is housed in the casing 202.

[0086] Multiple battery cells 3 in the battery module 201 can be electrically connected through a busbar component to achieve parallel, series, or mixed connection of multiple battery cells 3 in the battery module 201.

[0087] Figure 4 This is an exploded view of a battery cell according to an embodiment of this application. Battery cell 3 refers to the smallest unit that makes up a battery device. Figure 4 The battery cell 3 includes an end cap assembly, a housing 4, and an electrode assembly 5.

[0088] Electrode assembly 5 is the component in the battery cell 3 where the electrochemical reaction occurs. The casing 4 may contain one or more electrode assemblies 5. Electrode assembly 5 is mainly formed by winding or stacking electrode sheets, which are divided into positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the electrode body 52, while the portions of the positive and negative electrode sheets without active material each constitute a tab 51. The positive and negative tabs can be located together at one end of the electrode body 52 or separately at both ends of the electrode body 52. ​​During the charging and discharging process of the battery cell 3, the positive and negative active materials react with the electrolyte, and the tabs 51 connect to the electrode terminals to form a current loop.

[0089] The electrode assembly 5 can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0090] In some embodiments, the electrode assembly 5 is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0091] In some embodiments, the electrode assembly 5 is a stacked structure. As an example, multiple positive and negative electrodes can be provided, with multiple positive and multiple negative electrodes stacked alternately. Multiple spacers can be provided and respectively provided between any adjacent positive or negative electrodes. Alternatively, the spacers can be provided continuously and provided between any adjacent positive or negative electrodes by folding.

[0092] In some embodiments, the electrode assembly 5 may be cylindrical, flat, or polygonal in shape.

[0093] In some embodiments, the electrode assembly 5 is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0094] The battery cell 3 may include a housing. The housing 4 is an assembly used to cooperate with the end cap assembly to form the internal environment of the battery cell 3, wherein the formed internal environment can accommodate the electrode assembly 5, electrolyte (not shown in the figure), and other components. The housing 4 can be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film, etc. In some embodiments, the housing 4 can be a sealed structure or a non-sealed structure. As an example, when the housing 4 is a non-sealed structure, the housing 4 serves to protect the electrode assembly 5, and a sealing bag is also included between the housing 4 and the electrode assembly 5. The sealing bag is used to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film. When the housing 4 is a sealed structure, it is used to encapsulate the electrode assembly 5 and electrolyte, etc.

[0095] As an example, the battery cell 3 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 batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0096] The housing 4 and the end cap assembly can be independent components. One or more openings can be provided on the housing 4, and one or more end cap assemblies can close the openings to form the internal environment of the battery cell 3. Optionally, the end cap assembly and the housing 4 can also be integrated. Optionally, the end cap assembly and the housing 4 can form a common connection surface before other components are inserted into the housing, and the end cap assembly closes the housing 4 when it is necessary to encapsulate the interior of the housing 4.

[0097] In some embodiments, the electrode terminals can be disposed on the end cap assembly or on the housing 4, and the electrode terminals are electrically connected to the tabs 51. The electrode terminals can be directly connected to the tabs 51 or indirectly connected to the tabs 51 through an adapter mechanism.

[0098] Please see Figure 5 and Figure 6 , Figure 5 This is a schematic diagram of the electrode terminal structure of a battery cell provided in an embodiment of this application; Figure 6 yes Figure 5 Sectional view at point AA.

[0099] Firstly, such as Figures 4 to 6 As shown, this application provides a battery cell 3, which includes a housing 4, an electrode assembly 5, and an electrode terminal 61. The housing 4 includes a first wall 41; the electrode assembly 5 is housed within the housing 4; the electrode terminal 61 is disposed on the first wall 41, and the electrode terminal 61 includes a conductive part 612, an insulating part 611, and a first positioning mechanism 71. The conductive part 612 is electrically connected to the electrode assembly 5, the insulating part 611 is disposed around the conductive part 612 and connected to the first wall 41, and the first positioning mechanism 71 is disposed on the outer surface of the insulating part 611.

[0100] In the embodiment of this application, the battery cell 3 includes a housing 4, an electrode assembly 5, and an electrode terminal 61. The housing 4 includes a first wall 41, the electrode assembly 5 is housed within the housing 4, and the electrode terminal 61 is disposed on the first wall 41. The electrode terminal 61 includes a conductive part 612, an insulating part 611, and a first positioning mechanism 71. The conductive part 612 is electrically connected to the electrode assembly 5 so that the electrode terminal 61 can form a conductive connection with external devices. The insulating part 611 is disposed around the conductive part 612 and connected to the first wall 41, which can both stably connect the electrode terminal 61 and the housing 4 and insulate the conductive part 612 from the first wall 41. By disposing the first positioning mechanism 71 on the outer surface of the insulating part 611, it is not necessary to set a positioning mechanism on the conductive part 612 during the welding and positioning process of the busbar 8 and the conductive part 612. This improves the problem of reduced contact area and insufficient current carrying capacity between the conductive part 612 and the busbar 8 when the positioning mechanism is placed on the conductive part 612, thereby improving the reliability of the battery cell 3.

[0101] Optionally, the first wall 41 can be an end cover plate of the battery cell 3, with the electrode terminal 61 disposed on the end cover plate and connected to the electrode assembly 5; or the first wall 41 can be a wall plate of the housing 4, with the electrode terminal 61 disposed on the wall plate and connected to the electrode assembly 5.

[0102] For example, two electrode terminals 61 are disposed on the first wall 41, and the two electrode terminals 61 are a positive terminal and a negative terminal, respectively.

[0103] The electrode terminal 61 includes a conductive part 612 and an insulating part 611, which are bonded or snapped together. The conductive part 612 can be the terminal post of the battery cell 3. One end of the conductive part 612 is connected to the electrode assembly 5, and the other end of the conductive part 612 is connected to the busbar 8 to electrically connect adjacent battery cells 3.

[0104] An insulating portion 611 is disposed around the conductive portion 612 and connected to the first wall 41 to insulate the conductive portion 612 from the first wall 41. The insulating portion 611 and the first wall 41 are bonded or snap-fitted together. For example, the insulating portion 611 may be made of polyimide, polyphenylene sulfide, polyetheretherketone, etc.

[0105] Optionally, the electrode terminal 61 further includes a welding portion 613, which is connected to the insulating portion 611. The welding portion 613 surrounds the outside of the insulating portion 611 and is welded to the first wall 41. Exemplarily, the welding portion 613 and the insulating portion 611 are snap-fitted or bonded together.

[0106] Busbar 8 and conductive part 612 are welded together. Before welding busbar 8, it is necessary to check whether it is misaligned. Therefore, a positioning mechanism is provided between busbar 8 and electrode terminal 61. In related technologies, a blind groove is usually provided on the outer surface of conductive part 612 to align busbar 8. However, when conductive part 612 is small, the current flow area between conductive part 612 and busbar 8 is too small because the blind groove needs to be avoided. Also, because conductive part 612 is small, it is easy to weld into the blind groove when welding busbar 8, and the risk of soldering through conductive part 612 is relatively high.

[0107] For example, the case of a smaller conductive part 612 refers to the case where the diameter of the conductive part 612 is less than or equal to 14 mm.

[0108] For example, when the first positioning mechanism 71 is provided on the insulating part 611, the first positioning mechanism 71 is no longer provided on the conductive part 612, so that the conductive part 612 has sufficient area for welding the bus 8.

[0109] The electrode terminal 61 also includes a first positioning mechanism 71 disposed on the outer surface of the insulating part 611. During the welding process of the busbar 8 and the electrode terminal 61, the relative position of the busbar 8 and the electrode terminal 61 can be positioned by the first positioning mechanism 71 to reduce the risk of welding deviation of the busbar 8.

[0110] Optionally, the insulating part 611 includes an end face, a bottom face, and a side face that are connected to each other. The bottom face is the surface of the insulating part 611 facing the first wall 41, the end face is the surface of the insulating part 611 away from the first wall 41, and the side face is connected between the end face and the bottom face. The first positioning mechanism 71 is disposed on the end face and / or the side face.

[0111] Optionally, the first positioning mechanism 71 refers to a structure that can be distinguished from the outer surface of the insulating portion 611, so that the first positioning mechanism 71 and the insulating portion 611 can be differentiated during the welding process of the busbar 8. For example, the first positioning mechanism 71 can be a groove, a protrusion, a color block, or an edge of the insulating portion 611 itself. For example, the specific size, shape, and color of the first positioning mechanism 71 can be designed independently. For example, the first positioning mechanism 71 can be a protrusion provided on the side, or a color block provided on the end face, etc.

[0112] Optionally, the first positioning mechanism 71 and the insulating part 611 are integrally formed to enhance the connection reliability of the first positioning mechanism 71 and the insulating part 611. For example, the first positioning mechanism 71 and the insulating part 611 are injection molded. Alternatively, the first positioning mechanism 71 and the insulating part 611 can be detachably connected to facilitate the setting of first positioning mechanisms 71 of different sizes or shapes in different positions to adapt to battery devices 2 of different specifications and models. For example, the first positioning mechanism 71 and the insulating part 611 are plugged in or bonded together.

[0113] Please see Figure 7 and Figure 8 , Figure 7 This is a schematic diagram of the structure of the electrode terminals of a battery device provided in an embodiment of this application; Figure 8 This is a schematic diagram of the structure of the electrode terminals of a battery device provided in another embodiment of this application.

[0114] In some embodiments, such as Figure 7 and Figure 8 As shown, the electrode terminal 61 includes at least two first positioning mechanisms 71 spaced apart, or the first positioning mechanisms 71 are arranged around the conductive portion 612.

[0115] In these embodiments, at least two first positioning mechanisms 71 are spaced apart, which helps to reduce the risk of relative deflection between the busbar 8 and the conductive part 612. Alternatively, the first positioning mechanism 71 is arranged around the conductive part 612, increasing the area of ​​the first positioning mechanism 71 and helping to improve the reliability of the first positioning mechanism 71.

[0116] Optionally, the electrode terminal 61 includes at least two first positioning mechanisms 71 spaced apart. The busbar 8 and the at least two first positioning mechanisms 71 cooperate to position the busbar 8 and the conductive portion 612 to reduce the risk of deflection. For example, the at least two first positioning mechanisms 71 are spaced apart along the circumferential and / or radial direction of the conductive portion 612.

[0117] Optionally, the two first positioning mechanisms 71 may be the same or different. For example, both first positioning mechanisms 71 may be grooves, or one may be a groove and the other may be a protrusion.

[0118] For example, two, three, five, ten, etc., first positioning mechanisms 71 are provided on the insulating part 611.

[0119] Optionally, at least two first positioning mechanisms 71 are distributed symmetrically along the center of the pole post, which helps to balance the force on the insulating part 611 while improving the accuracy of the fit between the conductive part 612 and the busbar 8.

[0120] For example, the first positioning mechanism 71 is positioned around the center line of the pole post.

[0121] For example, at least two first positioning mechanisms 71 are coaxially arranged, and each first positioning mechanism 71 has a different radial dimension.

[0122] In some embodiments, such as Figure 5 and Figure 6 As shown, the first positioning mechanism 71 is disposed on the side of the insulating part 611 away from the first wall 41.

[0123] In these embodiments, the operable area of ​​the insulating part 611 on the side opposite to the first wall 41 is large, which reduces the difficulty of setting up the first positioning mechanism 71.

[0124] Specifically, the first positioning mechanism 71 is disposed on the side of the insulating part 611 away from the first wall 41 along the extension direction of the conductive part 612.

[0125] For example, the busbar 8 is welded to the conductive portion 612 along the extension direction of the conductive portion 612, and the busbar 8 is positioned with the first positioning mechanism 71 along the extension direction of the conductive portion 612.

[0126] In some embodiments, such as Figure 5 and Figure 6 As shown, the first positioning mechanism 71 includes a first color, and the insulating part 611 includes a second color. The first color and the second color are different.

[0127] In these embodiments, by setting the first positioning mechanism 71 and the insulating part 611 to be different colors, the recognizability of the first positioning mechanism 71 is improved, so that the busbar 8 can be positioned by the first positioning mechanism 71, and the problem of reduced structural strength of the insulating part 611 caused by setting the first positioning mechanism 71 is improved.

[0128] Optionally, a color block of the first color can be formed on the surface of the insulating part 611 by spraying or pad printing, which is simple to operate and has little impact on the structural strength of the insulating part 611; or a structural block of the first color can be embedded in the surface of the insulating part 611 to reduce the risk of the first positioning mechanism 71 falling off.

[0129] For example, the first color is white and the second color is black; or the first color is red and the second color is green; or the first color is blue and the second color is yellow.

[0130] Please see Figure 9 , Figure 9 This is a schematic diagram of the structure of the electrode terminals of a battery device provided in another embodiment of this application.

[0131] In some embodiments, such as Figure 5 and Figure 9 As shown, the first positioning mechanism 71 includes a positioning protrusion 711 disposed on the insulating part 611.

[0132] In these embodiments, the first positioning mechanism 71 includes a positioning protrusion 711 disposed on the outer surface of the insulating part 611 to improve the recognizability of the first positioning mechanism 71, facilitate the busbar 8 to complete the positioning through the first positioning mechanism 71, improve the problem of reduced structural strength of the insulating part 611 caused by the setting of the first positioning mechanism 71, and help to enhance the connection reliability between the first positioning mechanism 71 and the insulating part 611.

[0133] Optionally, the positioning protrusion 711 and the insulating part 611 are integrally formed to improve the connection reliability of the positioning protrusion 711 and the insulating part 611; or the positioning protrusion 711 and the insulating part 611 are separately formed, and the positioning protrusion 711 is bonded or snapped onto the insulating part 611 to facilitate the replacement and maintenance of the positioning protrusion 711.

[0134] Optionally, the positioning protrusion 711 can be cubic, cylindrical, or annular, etc.

[0135] Optionally, the size of the positioning protrusion 711 can be designed by the user, and the positioning protrusion 711 will not interfere with the busbar 8.

[0136] Optionally, the positioning protrusion 711 and the insulating part 611 can be set to different colors to enhance the recognizability of the positioning protrusion 711.

[0137] Please see Figure 10 , Figure 10 This is a partial structural schematic diagram of the electrode terminals of a battery device provided in an embodiment of this application.

[0138] In some embodiments, such as Figure 5 and Figure 10 As shown, the first positioning mechanism 71 includes a positioning groove 712 disposed on the insulating part 611.

[0139] In these embodiments, the first positioning mechanism 71 includes a positioning groove 712 disposed on the outer surface of the insulating part 611 to improve the recognizability of the first positioning mechanism 71, facilitate the positioning of the busbar 8 through the first positioning mechanism 71, and reduce the difficulty of setting the first positioning mechanism 71.

[0140] Optionally, the depth of the positioning groove 712 can be designed by the user. For example, the depth of the positioning groove 712 can be 0.1mm, 0.15mm, 0.2mm, etc.

[0141] Optionally, the positioning groove 712 can be a strip groove or a dot groove, etc.

[0142] Optionally, the positioning groove 712 and the insulating part 611 can be set to different colors to enhance the recognizability of the positioning groove 712.

[0143] Optionally, when the insulating part 611 is provided with multiple first positioning mechanisms 71 at intervals, the first positioning mechanism 71 can be any one of a color block, a positioning groove 712, or a positioning protrusion. That is, one or more of the color block, positioning groove 712, and positioning protrusion can be provided on the same insulating part 611.

[0144] In some embodiments, such as Figure 10 As shown, the positioning groove 712 and the edge of the insulating part 611 are spaced apart.

[0145] In these embodiments, the edges of the positioning groove 712 and the insulating portion 611 are spaced apart to improve the problem that the positioning groove 712 reduces the structural strength of the insulating portion 611.

[0146] Optionally, a positioning groove 712 is provided in the middle of the insulation part 611 along the radial direction of the pole post, so as to reduce the impact of the positioning groove 712 on the structural strength of the insulation part 611 and reduce the risk of the insulation part 611 breaking and the pole post being exposed.

[0147] In some embodiments, such as Figure 10 As shown, the minimum distance L between the positioning groove 712 and the edge of the insulating part 611 satisfies L≥0.5mm.

[0148] In these embodiments, when the minimum distance between the positioning groove 712 and the edge of the insulating portion 611 meets the above requirements, the risk of the insulating portion 611 having insufficient structural strength due to the setting of the positioning groove 712 is reduced.

[0149] For example, the minimum distance between the positioning groove 712 and the edge of the insulating part 611 is 0.5mm, 0.6mm, 0.8mm, 1.0mm, etc.

[0150] Please see Figure 11 and Figure 12 , Figure 11 This is a schematic diagram of the structure of a battery device provided in an embodiment of this application; Figure 12 This is a partial structural schematic diagram of a battery device provided in one embodiment of this application.

[0151] Secondly, such as Figure 11 and Figure 12 As shown, this application provides a battery device 2, which includes a busbar 8 and a battery cell 3 of any of the first aspects described above. The busbar 8 includes a body 81 and a second positioning mechanism 82. The body 81 is connected to a conductive part 612. At least a portion of the second positioning mechanism 82 is in contact with the first positioning mechanism 71 in the orthographic projection of the insulating part 611.

[0152] In the embodiment of this application, the busbar 8 includes a body 81 and a second positioning mechanism 82. The body 81 and the conductive part 612 are connected so that adjacent battery cells 3 can be electrically connected through the busbar 8. At least part of the second positioning mechanism 82 is in contact with the first positioning mechanism 71 on the orthographic projection of the insulating part 611 to achieve the positioning of the busbar 8 and the electrode terminal 61. By setting the first positioning mechanism 71 on the outer surface of the insulating part 611, it is not necessary to set the positioning mechanism on the conductive part 612 during the welding and positioning process of the busbar 8 and the conductive part 612. This improves the problem of reduced contact area between the conductive part 612 and the busbar 8 and insufficient current carrying capacity when the positioning mechanism is set on the conductive part 612, thereby improving the reliability of the battery cell 3.

[0153] Optionally, the battery device 2 includes at least two battery cells 3, and the busbar 8 connects the at least two battery cells 3 so that the at least two battery cells 3 are connected in series or in parallel.

[0154] For example, the busbar 8 is made of copper or aluminum. For example, the busbar 8 is in the shape of a rectangular sheet, and the busbar 8 and the conductive part 612 are welded together.

[0155] The fact that at least a portion of the second positioning mechanism 82 is in contact with the first positioning mechanism 71 in the orthographic projection of the insulating portion 611 means that at least a portion of the second positioning mechanism 82 is either coincident with or tangent to the first positioning mechanism 71 in the orthographic projection of the insulating portion 611.

[0156] The busbar 8 includes a body 81 and a second positioning mechanism 82. The body 81 is made of conductive material and is electrically connected to the conductive part 612. The second positioning mechanism 82 can be a through hole provided in the body 81, or the second positioning mechanism 82 can be an edge of the body 81, etc.

[0157] For example, the busbar 8 includes a welding area and a connection area, the welding area and the conductive part 612 are welded together, the second positioning mechanism 82 is disposed in the connection area, and at least part of the connection area coincides with the orthographic projection of the first wall 41 and the insulating part 611.

[0158] In some embodiments, such as Figure 11 and Figure 12As shown, the first positioning mechanism 71 is disposed on the side of the insulating part 611 away from the first wall 41, and the body 81 is disposed on the end of the conductive part 612 away from the electrode assembly 5. The first positioning mechanism 71 is disposed between the body 81 and the first wall 41.

[0159] In these embodiments, the first positioning mechanism 71 is disposed between the body 81 and the first wall 41 to facilitate the positioning of the busbar 8 and the electrode terminal 61, thereby helping to improve the connection reliability of the busbar 8 and the electrode terminal 61.

[0160] Optionally, in the extending direction of the conductive part 612, the first positioning mechanism 71 is disposed between the body 81 and the first wall 41, and at least a portion of the second positioning mechanism 82 is in contact with the first positioning mechanism 71 in the orthographic projection of the conductive part 612 in the extending direction.

[0161] Optionally, the first positioning mechanism 71 is disposed on the side of the insulating part 611 away from the first wall 41, the body 81 is disposed on the end of the conductive part 612 away from the first wall 41, and the first positioning mechanism 71 is disposed between the body 81 and the first wall 41, so as to facilitate the positioning of the first positioning mechanism 71 and the second positioning mechanism 82 in the extending direction of the conductive part 612.

[0162] In some embodiments, such as Figure 11 and Figure 12 As shown, the busbar 8 includes at least two second positioning mechanisms 82, which are spaced apart on the body 81.

[0163] In these embodiments, at least two second positioning mechanisms 82 are spaced apart on the body 81, which helps to reduce the risk of relative deflection between the busbar 8 and the conductive part 612 and helps to improve the connection reliability between the busbar 8 and the electrode terminal 61.

[0164] Optionally, the electrode terminal 61 includes at least two first positioning mechanisms 71 spaced apart, and at least two second positioning mechanisms 82 are arranged in a one-to-one correspondence with the at least two first positioning mechanisms 71 spaced apart; or the first positioning mechanisms 71 are arranged around the conductive part 612, and at least two second positioning mechanisms 82 are arranged in a corresponding manner with the first positioning mechanisms 71.

[0165] Optionally, the manifold 8 may include at least two second positioning mechanisms 82 that are the same or different.

[0166] For example, the manifold 8 includes 2, 3, or 5 second positioning mechanisms 82.

[0167] Please see Figure 13 , Figure 13 This is a schematic diagram of the structure of a battery device provided in an embodiment of this application.

[0168] In some embodiments, such as Figures 11 to 13 As shown, the second positioning mechanism 82 includes a positioning hole 821 that penetrates the body 81.

[0169] In these embodiments, the second positioning mechanism 82 includes a positioning hole 821 that penetrates the body 81. The first positioning mechanism 71 can be easily observed through the positioning hole 821, which helps to reduce the difficulty of setting the second positioning mechanism 82 and improves the alignment reliability of the electrode terminal 61 and the bus 8.

[0170] Optionally, the positioning hole 821 serves to release welding stress and reduce the risk of cracking during the welding process of the busbar 8 and the conductive part 612.

[0171] The shape and size of the positioning hole 821 can be designed by the user. For example, the positioning hole 821 can be a circular hole, an elliptical hole, or an oblong hole, etc.

[0172] Optionally, if the manifold 8 is provided with at least two second positioning mechanisms 82, the two positioning holes 821 may be the same or different in size and shape.

[0173] Optionally, if the busbar 8 is welded to the conductive part 612, the distance between the busbar 8 and the insulating part 611 can be measured through the positioning hole 821 to obtain the welding gap value between the conductive part 612 and the busbar 8.

[0174] Optionally, when the busbar 8 is welded to the conductive part 612, the center of the positioning hole 821 coincides with the midpoint or centerline of the first positioning mechanism 71 in the first direction, so as to reduce the positioning difficulty of the first positioning mechanism 71 and the second positioning mechanism 82. Specifically, the center of the positioning hole 821 is more obvious than other parts, and the same applies to the first positioning mechanism 71.

[0175] Optionally, the positioning hole 821 may be covered with a transparent material layer to reinforce the busbar 8 and reduce the impact of the opening on the structure of the busbar 8. For example, the transparent material layer may mark the center point of the positioning hole 821 to facilitate the positioning of the busbar 8.

[0176] Optionally, the size of the positioning hole 821 can be designed by the user. For example, the diameter of the positioning hole 821 is 2mm, 2.5mm, 3mm, etc.

[0177] Please see Figure 14 , Figure 14 yes Figure 13 A magnified structural diagram at point B in the middle.

[0178] In some embodiments, such as Figure 13 and Figure 14 As shown, the diameter D1 of the positioning hole 821 and the dimension D2 of the first positioning mechanism 71 in the radial direction of the conductive part 612 satisfy D2 < D1.

[0179] In these embodiments, when the diameter D1 of the positioning hole 821 and the dimension D2 of the first positioning mechanism 71 in the radial direction of the pole post meet the above conditions, it is convenient to observe the two side edges of the first positioning mechanism 71 through the positioning hole 821, thereby improving the positioning accuracy of the first positioning mechanism 71 and the second positioning mechanism 82.

[0180] Optionally, when the diameter D1 of the positioning hole 821 and the radial dimension D2 of the first positioning mechanism 71 in the conductive part 612 meet the above conditions, the two sides of the first positioning mechanism 71 can be observed through the observation hole, so as to facilitate finding the midpoint or centerline of the first positioning mechanism 71 through the edge, and to facilitate the positioning of the first positioning mechanism 71 and the positioning hole 821.

[0181] For example, the conductive part 612 is cylindrical.

[0182] For example, the first positioning mechanism 71 is arranged around the pole post, the first positioning mechanism 71 is annular, and the ring width of the first positioning mechanism 71 is D2.

[0183] For example, a plurality of first positioning mechanisms 71 are spaced apart from each other, and the distance between the edge of the first positioning mechanism 71 away from the conductive part 612 and the edge of the first positioning mechanism 71 near the conductive part 612 is D2.

[0184] Thirdly, embodiments of this application provide an electrical device, including the battery device of any of the embodiments of the second aspect described above.

[0185] In some embodiments, such as Figures 1 to 14As shown, this application provides a battery device 2, which includes a busbar 8 and a battery cell 3. The battery cell 3 includes a housing 4, an electrode assembly 5, and an electrode terminal 61. The housing 4 includes a first wall 41. The electrode assembly 5 is housed within the housing 4. The electrode terminal 61 is disposed on the first wall 41 and includes a conductive part 612, an insulating part 611, and a first positioning mechanism 71. The conductive part 612 is electrically connected to the electrode assembly 5. The insulating part 611 is disposed around the conductive part 612 and connected to the first wall 41. The first positioning mechanism 71 is disposed on the side of the insulating part 611 away from the first wall 41. The electrode terminal 61 includes at least two first positioning mechanisms 71 spaced apart, or the first positioning mechanism 71 is disposed around the conductive part 612. The first positioning mechanism 71 includes a first color, and the insulating part 611 includes a second color. The first color and the second color are different. Alternatively, the first positioning mechanism 71 includes a first positioning mechanism disposed on the insulating part 612. The positioning protrusion 711 of part 611, or the first positioning mechanism 71 includes a positioning groove 712 disposed in the insulating part 611, the minimum distance L from the positioning groove 712 to the edge of the insulating part 611 satisfies L≥0.5mm, the busbar 8 includes a body 81 and a second positioning mechanism 82, the body 81 and the conductive part 612 are connected, at least part of the second positioning mechanism 82 is in contact with the first positioning mechanism 71 in the orthographic projection of the insulating part 611, the body 81 is disposed at one end of the conductive part 612 away from the first wall 41, the first positioning mechanism 71 is disposed between the body 81 and the first wall 41, the busbar 8 includes at least two second positioning mechanisms 82, the at least two second positioning mechanisms 82 are spaced apart on the body 81, the second positioning mechanism 82 includes a positioning hole 821 penetrating the body 81, the diameter D1 of the positioning hole 821, the dimension D2 of the first positioning mechanism 71 in the radial direction of the conductive part 612 satisfies D2<D1.

[0186] In these embodiments, the battery cell 3 includes a housing 4, an electrode assembly 5, and an electrode terminal 61. The housing 4 includes a first wall 41. The electrode assembly 5 is housed within the housing 4. The electrode terminal 61 is disposed on the first wall 41. The electrode terminal 61 includes a conductive portion 612, an insulating portion 611, and a first positioning mechanism 71. The conductive portion 612 is electrically connected to the electrode assembly 5 so that the electrode terminal 61 can conduct to external devices. The insulating portion 611 is disposed around the conductive portion 612 and connected to the first wall 41, which can stably connect the electrode terminal 61 to the housing 4 and insulate the conductive portion 612 from the first wall 41. The busbar 8 includes a body 81 and a second positioning mechanism. 82. The main body 81 and the conductive part 612 are connected so that adjacent battery cells 3 can be electrically connected through the busbar 8. At least part of the second positioning mechanism 82 is in contact with the first positioning mechanism 71 on the orthographic projection of the insulating part 611 to realize the positioning of the busbar 8 and the electrode terminal 61. By setting the first positioning mechanism 71 on the outer surface of the insulating part 611, it is not necessary to set the positioning mechanism on the conductive part 612 during the welding positioning process of the busbar 8 and the conductive part 612. This improves the problem of insufficient current carrying capacity caused by the reduced contact area between the conductive part 612 and the busbar 8 when the positioning mechanism is set on the conductive part 612, and improves the reliability of the battery cell 3.

[0187] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The shell includes the first wall; Electrode assembly, housed within the housing; An electrode terminal is disposed on the first wall and electrically connected to the electrode assembly. The electrode terminal includes a conductive part, an insulating part, and a first positioning mechanism. The conductive part is electrically connected to the electrode assembly. The insulating part is disposed around the conductive part and connected to the first wall. The first positioning mechanism is disposed on the outer surface of the insulating part.

2. The battery cell according to claim 1, characterized in that, The electrode terminal includes at least two of the first positioning mechanisms spaced apart, or the first positioning mechanisms are arranged around the conductive portion.

3. The battery cell according to claim 1, characterized in that, The first positioning mechanism is located on the side of the insulating part away from the first wall.

4. The battery cell according to any one of claims 1 to 3, characterized in that, The first positioning mechanism includes a first color, and the insulating part includes a second color, wherein the first color and the second color are different.

5. The battery cell according to any one of claims 1 to 3, characterized in that, The first positioning mechanism includes a positioning protrusion disposed on the insulating portion.

6. The battery cell according to any one of claims 1 to 3, characterized in that, The first positioning mechanism includes a positioning groove disposed on the insulating part.

7. The battery cell according to claim 6, characterized in that, The positioning groove and the edge of the insulating part are spaced apart.

8. The battery cell according to claim 7, characterized in that, The minimum distance L between the positioning groove and the edge of the insulating part satisfies L≥0.5mm.

9. A battery device, characterized in that, The device includes a busbar and a battery cell as described in any one of claims 1-8. The busbar includes a body and a second positioning mechanism. The body and the conductive portion are connected. At least a portion of the second positioning mechanism is in contact with the first positioning mechanism through its orthographic projection onto the insulating portion.

10. The battery device according to claim 9, characterized in that, The first positioning mechanism is disposed on the side of the insulating part away from the first wall, the body is disposed on the end of the conductive part away from the electrode assembly, and the first positioning mechanism is disposed between the body and the first wall.

11. The battery device according to claim 9, characterized in that, The manifold includes at least two second positioning mechanisms, which are spaced apart on the body.

12. The battery device according to claim 9, characterized in that, The second positioning mechanism includes a positioning hole that penetrates the body.

13. The battery device according to claim 12, characterized in that, The diameter D1 of the positioning hole and the dimension D2 of the first positioning mechanism in the radial direction of the conductive part satisfy D2 < D1.

14. An electrical appliance, characterized in that, The battery device includes any one of claims 9-13 above.

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