Battery apparatus and electric device

Abstract

Provided in the embodiments of the present application are a battery apparatus and an electric device. The battery apparatus comprises a plurality of battery cells (1), a busbar (2) and a sampling assembly (3), wherein the plurality of battery cells (1) are used for providing electric energy; the busbar (2) is used for implementing electrical connection between the plurality of battery cells (1); the sampling assembly (3) is arranged between the battery cells (1) and the busbar (2); and the battery cells (1), the busbar (2) and the sampling assembly (3) are configured to be connected by means of a single welding process. The electric device comprises the battery apparatus. The present application can effectively improve the manufacturing efficiency of a battery apparatus and reduce investment costs.

Description

Battery devices and electrical equipment Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery device and an electrical appliance. 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] The manufacturing process of batteries involves multiple connections between various components, making the operation very complex.

[0004] The above statements are for the purpose of providing background information in relation to this application only and do not necessarily constitute prior art. Summary of the Invention

[0005] This application provides a battery device and an electrical appliance that can effectively simplify the operation steps in the battery device manufacturing process.

[0006] In a first aspect, this application provides a battery device, comprising:

[0007] Multiple battery cells are used to provide electrical energy;

[0008] Busbars are used to electrically connect multiple battery cells; and

[0009] The sampling component is positioned between the battery cell and the busbar, and the battery cell, busbar and sampling component are configured to be connected by a single soldering.

[0010] By constructing the battery cells, busbars, and sampling components to be connected through a single weld, the welding connection between the battery cells, busbars, and sampling components can be achieved in one weld. Compared to related technologies that require two welds to complete the connection, the embodiments of this application can reduce the number of welds, simplify the operation steps in the manufacturing process, thereby effectively improving the manufacturing efficiency of the battery device; it can also reduce the number of welding equipment required, lower investment costs, and reduce the footprint of manufacturing equipment, which is conducive to incremental production expansion.

[0011] In some embodiments, the battery cell includes a terminal post, and the terminal post, busbar, and sampling assembly are configured to be connected by a single soldering.

[0012] In this embodiment, the terminal serves as the current output or input terminal of a battery cell. By connecting both the busbar and the sampling component to the terminal of the battery cell, the purpose of electrically connecting multiple battery cells through the busbar can be effectively achieved.

[0013] In some embodiments, the sampling component has a first through hole, the battery cell has a first protrusion, and the sampling component is fitted onto the first protrusion through the first through hole.

[0014] By setting a first through hole on the sampling component and a first protrusion on the battery cell, the sampling component can be fitted onto the first protrusion through the first through hole, thereby achieving the positioning and connection of the sampling component and the battery cell, and effectively ensuring the relative fixation between the sampling component and the battery cell.

[0015] The combination of the first through hole and the first protrusion can not only achieve relative fixation between the sampling component and the battery cell, but also facilitate positioning and alignment during the assembly process of the sampling component and the battery cell.

[0016] In some embodiments, the battery device further includes a bracket mounted on the battery cell, and the sampling component mounted on the bracket.

[0017] By setting up a bracket, the sampling component can be mounted on the bracket, thereby effectively protecting the individual battery cells and preventing damage to them.

[0018] In some embodiments, the sampling component has a second through hole, the bracket has a second protrusion, and the sampling component is fitted onto the second protrusion through the second through hole.

[0019] By setting a second through hole on the sampling component and a second protrusion on the bracket, the sampling component can be fitted onto the second protrusion through the second through hole, thereby achieving the positioning and connection of the sampling component and the bracket, and effectively ensuring the relative fixation between the sampling component and the bracket.

[0020] The combination of the second through hole and the second protrusion can not only achieve relative fixation between the sampling component and the bracket, but also facilitate positioning and alignment during the assembly process of the sampling component and the bracket.

[0021] In some embodiments, the bracket has a third through hole, the battery cell has a third protrusion, and the bracket is fitted onto the third protrusion through the third through hole.

[0022] By setting a third through hole on the bracket and a third protrusion on the battery cell, the bracket can be fitted onto the third protrusion through the third through hole, thereby achieving the positioning and connection of the bracket and the battery cell, and effectively ensuring the relative fixation between the bracket and the battery cell.

[0023] The combination of the third through hole and the third protrusion can not only achieve relative fixation between the bracket and the battery cell, but also facilitate positioning and alignment during the assembly process of the bracket and the battery cell.

[0024] In some embodiments, the sampling assembly includes a carrier, a connecting piece, and a sampling line. The connecting piece is mounted on the carrier, and the sampling line and the battery cell are electrically connected through the connecting piece.

[0025] By setting up a carrier, it can be used to support the connecting pieces and sampling lines. Especially when there are multiple connecting pieces and sampling lines, the carrier can achieve relative fixation of multiple connecting pieces and sampling lines.

[0026] In some embodiments, the support element is made of plastic material. Plastic material has good hardness and can achieve good support under the same thickness conditions.

[0027] In some embodiments, the sampling line includes a main body segment and a folded-back segment that bends relative to the extension direction of the main body segment.

[0028] By incorporating a bent fold section, the length of the sampling line can be increased, thereby enhancing its resistance to the tensile forces exerted on the sampling line by the thermal expansion of individual battery cells. This effectively prevents the sampling line from breaking due to thermal expansion of individual battery cells, thus protecting the safety of the sampling line, ensuring the effectiveness of sampling, and also contributing to improving the service life of the battery device.

[0029] In some embodiments, the length of the folded section is 2mm to 10mm.

[0030] Setting the length of the foldback section to 2mm to 10mm, such as 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm, can not only give the foldback section a better ability to resist the pulling force formed on the sampling line by the thermal expansion of the battery cell, but also facilitate the arrangement and fixation of the foldback section.

[0031] In some embodiments, the thickness of the connecting piece is 0.2 mm to 1 mm.

[0032] Setting the thickness of the connecting piece to 0.2mm to 1mm, such as 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm, can not only give the connecting piece good electrical connection performance, but also allow the welding laser to penetrate the connecting piece to reach the battery cell, so as to realize the one-time welding connection of the bus, sampling component and battery cell.

[0033] In some embodiments, the thickness of the busbar is 0.8 mm to 3 mm.

[0034] Setting the bus thickness to 0.8mm to 3mm, such as 0.8mm, 0.9mm, 1mm, 1.5mm, 2mm, 2.5mm or 3mm, can give the bus both good strength and good electrical connection performance.

[0035] Secondly, this application provides an electrical device including the aforementioned battery device, which is used to supply electrical energy to the electrical device.

[0036] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0038] Figure 1 is a schematic diagram of the structure of some embodiments of the electrical equipment disclosed in this application.

[0039] Figure 2 is a schematic diagram of the structure of some embodiments of the battery device disclosed in this application.

[0040] Figure 3 is a partial structural schematic diagram of some embodiments of the battery device disclosed in this application.

[0041] Figure 4 is an exploded view of some embodiments of the battery device disclosed in this application.

[0042] Figure 5 is an exploded view of the sampling component in some embodiments of the battery device disclosed in this application.

[0043] Figure 6 is a schematic diagram of the structure of some embodiments of the battery device disclosed in this application and a partial enlarged view thereof.

[0044] Figure 7 is a schematic diagram of the support structure in some embodiments of the battery device disclosed in this application.

[0045] Figure 8 is a top view and a partial enlarged view of some embodiments of the battery device disclosed in this application.

[0046] The accompanying drawings are not drawn to scale.

[0047] Marker explanation:

[0048] 1000, Vehicle; 100, Battery unit; 200, Controller; 300, Motor; 10, Housing; 101, First cover; 102, Second cover;

[0049] 1. Battery cell; 11. Terminal post; 12. First protrusion; 13. Third protrusion; 2. Busbar; 3. Sampling assembly; 31. Support member; 311. First through hole; 312. Second through hole; 32. Connecting piece; 33. Sampling line; 331. Main body section; 332. Fold-back section; 4. Bracket; 41. Second protrusion; 42. Third through hole. Detailed Implementation

[0050] 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.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein 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 specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0052] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. Furthermore, the term "vertical" is not strictly vertical, but within the allowable range of error. Similarly, "parallel" is not strictly parallel, but within the allowable range of error.

[0053] In this document, the term "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 throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0054] In the description of the embodiments 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, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0055] In the description of the embodiments of this application, the term "multiple" refers to two or more, unless otherwise expressly and specifically defined. Similarly, "multiple sets" refers to two or more sets, and "multiple pieces" refers to two or more pieces, unless otherwise expressly and specifically defined.

[0056] 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," and "circumferential" 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 are not intended to 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.

[0057] 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 connection; 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.

[0058] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used 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 power battery applications, market demand is also constantly increasing.

[0059] As market demand continues to expand, increasingly higher demands are being placed on battery manufacturing efficiency. The battery manufacturing process involves multiple connections between various components, and the complexity of these connections directly reduces manufacturing efficiency.

[0060] For example, when multiple battery cells need to be sampled and tested, the connection between the busbar, sampling assembly, and multiple battery cells typically involves two steps: first, welding the busbar to the sampling assembly, and second, welding the sampling assembly to the battery cells. Therefore, the connection of the sampling assembly requires two welding operations, necessitating two sets of laser welding equipment for the manufacturing plant. This represents a significant investment, occupies a large area, increases costs, and hinders production expansion.

[0061] Therefore, this application modifies the structure of the battery device so that the busbar, sampling component and battery cell can be connected by a single welding process.

[0062] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, features in the following embodiments can be combined with each other.

[0063] The battery devices disclosed in this application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft. The power system of such electrical equipment can be composed using the battery devices disclosed in this application. This effectively simplifies the operation steps in the battery device manufacturing process, thereby effectively improving the manufacturing efficiency of the battery device, meeting increasing demand, reducing costs, and decreasing the footprint of manufacturing equipment.

[0064] This application provides an electrical device that uses a battery as a power source, the battery being configured to provide electrical energy to the device. The electrical device can be, but is not limited to, mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys, and power tools, etc. For example, 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.

[0065] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0066] Please refer to Figure 1, which is a structural schematic diagram 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, and 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 power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The battery device 100 provides electrical energy for the operation of the motor 300 and other components in the vehicle, and the controller 200 controls the operation of the motor 300, for example, to meet the power requirements of the vehicle 1000 during startup, navigation, and driving.

[0067] In some embodiments of this application, the battery device 100 can not only serve as the operating 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.

[0068] Please refer to Figure 2, which is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 10 and a battery cell 1, with the battery cell 1 housed within the housing 10. The housing 10 provides a space for the battery cell 1, and can employ various structures. In some embodiments, the housing 10 may include a first cover 101 and a second cover 102, which overlap each other, collectively defining a space for accommodating the battery cell 1. The second cover 102 may be a hollow structure with one open end, while the first cover 101 may be a plate-like structure, fitting over the open side of the second cover 102 to jointly define the accommodating space. Alternatively, both the first cover 101 and the second cover 102 may be hollow structures with one open side, with the open side of the first cover 101 fitting over the open side of the second cover 102. Of course, the box 10 formed by the first cover 101 and the second cover 102 can be of various shapes, such as a cylinder, a cuboid, etc.

[0069] In the battery device 100, there can be multiple battery cells 1, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 1 are connected in both series and parallel configurations. Multiple battery cells 1 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 1 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 1 first connected in series, parallel, or in a mixed manner to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 10. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 1.

[0070] The battery cell 1 includes lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and this application embodiment is not limited to these. The battery cell can be cylindrical, flat, cuboid, or other shapes, etc., and this application embodiment is not limited to these. Battery cells are generally divided into three types according to their packaging method: cylindrical battery cells, cuboid / square battery cells, and pouch battery cells, and this application embodiment is not limited to these.

[0071] In some embodiments, the battery device 100 may include a housing and a battery module. The housing provides a space for the battery module, which is mounted within the housing. The housing may be made of metal. The battery module may include multiple battery cells connected in series, parallel, or a combination thereof. A battery cell is the smallest unit that makes up a battery. A battery cell includes electrode components capable of undergoing electrochemical reactions.

[0072] In some embodiments, the battery may include a housing and individual battery cells, with the individual battery cells housed within the housing.

[0073] 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.

[0074] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0075] The individual battery cells 1 are electrically connected, such as in series, parallel, or mixed connection, to achieve the required electrical performance parameters of the battery device 100. Mixed connection refers to multiple battery cells 1 being connected in both series and parallel. Adjacent battery cells 1 can be electrically connected through busbars 2. Multiple battery cells 1 are arranged in rows, and one or more rows of battery cells 1 can be arranged in the housing as needed.

[0076] In some embodiments, the individual battery cells 1 of the battery device 100 can be arranged along at least one of the length and width directions of the housing. At least one row or column of battery cells 1 can be provided as needed. Alternatively, one or more layers of battery cells 1 can be provided along the height direction of the battery device 100 as required.

[0077] In some embodiments, multiple battery cells 1 may first be connected in series, parallel, or in a mixed manner to form a battery module, and then the multiple battery modules may be connected in series, parallel, or in a mixed manner to form a whole, which is then housed in a housing. In other embodiments, all battery cells 1 are directly connected in series, parallel, or in a mixed manner, and then the whole composed of all battery cells 1 is housed in a housing.

[0078] In some embodiments, the battery cell 1 includes: an electrode assembly, a housing, an end cap, and a current collector assembly. The housing has a receiving cavity for accommodating the electrode assembly and an open end communicating with the receiving cavity. The end cap closes to the open end. The current collector assembly is electrically connected to the electrode assembly and the housing.

[0079] The electrode assembly may include a first electrode and a second electrode with opposite polarities, and a separator disposed between the first electrode and the second electrode. In some embodiments, the first electrode is a positive electrode and the second electrode is a negative electrode. In other embodiments, the first electrode is a negative electrode and the second electrode is a positive electrode. During the charging and discharging process of a single battery cell, active ions repeatedly insert and extract between the positive and negative electrode. The separator, disposed between the positive and negative electrode, serves to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0080] In some embodiments, the positive electrode may include a positive current collector substrate and a positive active material layer disposed on at least one surface of the positive current collector substrate.

[0081] As an example, the positive current collector substrate has two surfaces opposite each other in its own thickness direction, and the positive active material layer is disposed on either or both of the two opposite surfaces of the positive current collector substrate.

[0082] As an example, the positive electrode current collector substrate can be a metal foil or a composite current collector. For example, as a metal foil, silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium, etc., can be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by depositing a metal material on a polymer material base layer.

[0083] In some embodiments, the negative electrode sheet may include a negative current collector substrate.

[0084] As an example, the negative electrode current collector substrate can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by depositing a metal material on a polymer material base layer.

[0085] In some embodiments, the negative electrode sheet may include a negative electrode current collector substrate and a negative electrode active material layer disposed on at least one surface of the negative electrode current collector substrate.

[0086] As an example, the negative electrode current collector substrate has two surfaces opposite each other in its own thickness direction, and the negative electrode active material layer is disposed on either or both of the two opposite surfaces of the negative electrode current collector substrate.

[0087] In some embodiments, the positive electrode current collector substrate can be made of aluminum, and the negative electrode current collector substrate can be made of copper.

[0088] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0089] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component located between the positive and negative electrode plates, or it can be located between the positive and negative electrode plates while being attached to the surface of the positive electrode plate and / or the surface of the negative electrode plate.

[0090] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrode plates, serving both to transport ions and to isolate the positive and negative electrodes.

[0091] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0092] As an example, liquid electrolytes include electrolyte salts and solvents.

[0093] In some embodiments, the electrode assembly includes a main body. The main body can be a wound structure formed by winding a positive electrode, a negative electrode, and a separator, or a stacked structure formed by overlapping positive electrode, negative electrode, and a separator. One or more positive and negative electrode sheets can be provided respectively. As an example, multiple positive electrode sheets and multiple negative electrode sheets are alternately arranged along the electrode thickness direction.

[0094] In some embodiments, the main body may be cylindrical, flat, or polygonal. The ends of the main body may be provided with a first tab and a second tab. The first tab can be formed by cutting or trimming the current collector substrate of the first electrode, or it can be welded to the side of the current collector substrate of the first electrode. The second tab can be formed by cutting or trimming the current collector substrate of the second electrode, or it can be welded to the side of the current collector substrate of the second electrode.

[0095] In an embodiment where the first electrode is a positive electrode and the second electrode is a negative electrode, the first electrode includes a positive electrode tab serving as a first electrode tab, and the second electrode includes a negative electrode tab serving as a second electrode tab. In an embodiment where the first electrode is a negative electrode and the second electrode is a positive electrode, the first electrode includes a negative electrode tab serving as a first electrode tab, and the second electrode includes a positive electrode tab serving as a second electrode tab.

[0096] The housing is used to encapsulate electrode components and electrolytes. The housing can be made of steel, aluminum, or composite metals.

[0097] 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 batteries, such as hexagonal prismatic batteries.

[0098] The housing has a cavity for accommodating electrode assemblies and electrolytes, and an open end communicating with the cavity for inserting the electrode assemblies. An end cap is provided at the open end to close it, thereby sealing the open end with the end cap.

[0099] 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.

[0100] 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 the embodiments of this application are not limited to this.

[0101] The battery cells in this application embodiment are applicable to various types of batteries. The battery referred to herein is a single physical module comprising one or more battery cells to provide higher voltage and capacity.

[0102] The structure of some embodiments of the battery device provided in this application is described below with reference to Figures 3 to 8.

[0103] As shown in Figure 3, in some embodiments, the battery device includes multiple battery cells 1, a busbar 2, and a sampling component 3. The multiple battery cells 1 are used to provide electrical energy, the busbar 2 is used to realize the electrical connection of the multiple battery cells 1, and the sampling component 3 is disposed between the battery cells 1 and the busbar 2. The battery cells 1, the busbar 2, and the sampling component 3 are configured to be connected by a single welding.

[0104] In this embodiment, the battery device includes multiple battery cells 1 for providing electrical energy. The multiple battery cells 1 can be electrically connected via a busbar 2, such as in series, parallel, or mixed connections. A sampling component 3 can be used to collect current, voltage, or other parameter signals from the multiple battery cells 1, so that the control system within the battery device can control the current, voltage, or other parameters of the battery cells 1, or take corresponding measures.

[0105] In this embodiment, the sampling component 3 is disposed between the battery cell 1 and the busbar 2, and the battery cell 1, busbar 2, and sampling component 3 are configured to be connected by a single welding operation. By configuring the battery cell 1, busbar 2, and sampling component 3 to be connected by a single welding operation, the welding connection between the battery cell 1, busbar 2, and sampling component 3 can be achieved in one welding operation. Compared with related technologies that require two welding operations, this embodiment can reduce the number of welding operations, simplify the operation steps in the manufacturing process, thereby effectively improving the manufacturing efficiency of the battery device; it can also reduce the number of welding equipment required, reduce investment costs, reduce the footprint of manufacturing equipment, and facilitate incremental production expansion.

[0106] In this embodiment, the battery cell 1, busbar 2, and sampling component 3 are configured to be connected by a single welding operation. This means that the connection between the battery cell 1, busbar 2, and sampling component 3 can be completed in one welding operation at a single connection point, and is not limited to multiple connection points or the connection of multiple battery cells 1. Of course, in embodiments where each connection point is equipped with a welding head, it can also be understood that multiple battery cells 1 and multiple connection points of the busbar 2 and sampling component 3 can be connected by a single synchronous welding operation.

[0107] When welding the battery cell 1, busbar 2 and sampling component 3, the energy of the welding laser can penetrate the busbar 2 and sampling component 3 to reach the battery cell 1. The three-layer structure of battery cell 1, busbar 2 and sampling component 3 are welded at the same time, which realizes both the electrical connection between multiple battery cells 1 and the sampling.

[0108] In some embodiments, the battery cell 1 includes a terminal post 11, and the terminal post 11, bus 2, and sampling assembly 3 are configured to be connected by a single welding process.

[0109] In this embodiment, the terminal 11 serves as the current output or input terminal of the battery cell 1. By connecting both the busbar 2 and the sampling component 3 to the terminal 11 of the battery cell 1, the purpose of electrically connecting multiple battery cells 1 through the busbar 2 can be effectively achieved.

[0110] As shown in Figures 4 and 5, in some embodiments, the sampling component 3 is provided with a first through hole 311, the battery cell 1 is provided with a first protrusion 12, and the sampling component 3 is fitted onto the first protrusion 12 through the first through hole 311.

[0111] By providing a first through hole 311 on the sampling component 3 and a first protrusion 12 on the battery cell 1, the sampling component 3 can be fitted onto the first protrusion 12 through the first through hole 311, thereby achieving the positioning and connection of the sampling component 3 and the battery cell 1, and effectively ensuring the relative fixation between the sampling component 3 and the battery cell 1.

[0112] The combination of the first through hole 311 and the first protrusion 12 can not only achieve relative fixation between the sampling component 3 and the battery cell 1, but also facilitate positioning and alignment during the assembly process of the sampling component 3 and the battery cell 1.

[0113] The first protrusion 12 can be a protrusion specifically designed for connecting the sampling component 3 on the battery cell 1, or it can be an existing protrusion on the battery cell 1 that can be used, or the terminal post 11 on the battery cell 1 can be used as the first protrusion 12, as shown in Figure 4.

[0114] The shapes of the first through hole 311 and the first protrusion 12 are matched to ensure that the sampling component 3 can be fitted onto the first protrusion 12 through the first through hole 311. For example, the cross-sections of the first through hole 311 and the first protrusion 12 can both be circular, triangular, quadrilateral or other shapes.

[0115] In other embodiments, a protrusion may be provided on the sampling component 3, and a concave hole may be provided on the battery cell 1 to achieve a hole-post fit between the sampling component 3 and the battery cell 1.

[0116] As shown in Figure 6, in some embodiments, the battery device further includes a bracket 4, which is mounted on the battery cell 1, and the sampling component 3 is mounted on the bracket 4.

[0117] By setting the bracket 4, the sampling component 3 can be installed on the bracket 4, thereby effectively protecting the battery cell 1 and preventing damage to the battery cell 1.

[0118] As shown in Figure 7, in some embodiments, the sampling component 3 is provided with a second through hole 312, and the bracket 4 is provided with a second protrusion 41. The sampling component 3 is fitted onto the second protrusion 41 through the second through hole 312.

[0119] By providing a second through hole 312 on the sampling component 3 and a second protrusion 41 on the bracket 4, the sampling component 3 can be fitted onto the second protrusion 41 through the second through hole 312, thereby achieving the positioning and connection of the sampling component 3 and the bracket 4, and effectively ensuring the relative fixation between the sampling component 3 and the bracket 4.

[0120] The combination of the second through hole 312 and the second protrusion 41 can not only achieve relative fixation between the sampling component 3 and the bracket 4, but also facilitate positioning and alignment during the assembly process of the sampling component 3 and the bracket 4.

[0121] The shapes of the second through hole 312 and the second protrusion 41 are matched to ensure that the sampling component 3 can be fitted onto the second protrusion 41 through the second through hole 312. For example, the cross-sections of the second through hole 312 and the second protrusion 41 can both be circular, triangular, quadrilateral or other shapes.

[0122] In other embodiments, a protrusion may be provided on the sampling component 3, and a concave hole may be provided on the bracket 4 to achieve a hole-post fit between the sampling component 3 and the bracket 4.

[0123] In some embodiments, the bracket 4 is provided with a third through hole 42, the battery cell 1 is provided with a third protrusion 13, and the bracket 4 is fitted onto the third protrusion 13 through the third through hole 42.

[0124] By providing a third through hole 42 on the bracket 4 and a third protrusion 13 on the battery cell 1, the bracket 4 can be fitted onto the third protrusion 13 through the third through hole 42, thereby achieving the positioning and connection of the bracket 4 and the battery cell 1, and effectively ensuring the relative fixation between the bracket 4 and the battery cell 1.

[0125] The combination of the third through hole 42 and the third protrusion 13 can not only achieve relative fixation between the bracket 4 and the battery cell 1, but also facilitate positioning and alignment during the assembly process of the bracket 4 and the battery cell 1.

[0126] The third protrusion 13 can be a protrusion specifically designed for connecting the bracket 4 on the battery cell 1, or it can be an existing protrusion on the battery cell 1 that can be used. Alternatively, the two terminals 11 and the explosion-proof valve on the battery cell 1 can be used as the third protrusion 13, as shown in Figure 6.

[0127] The shapes of the third through hole 42 and the third protrusion 13 are matched to ensure that the bracket 4 can be fitted onto the third protrusion 13 through the third through hole 42. For example, the cross-sections of the third through hole 42 and the third protrusion 13 can both be circular, triangular, quadrilateral or other shapes.

[0128] In other embodiments, a protrusion may be provided on the bracket 4, and a recess may be provided on the battery cell 1 to achieve a hole-post fit between the bracket 4 and the battery cell 1.

[0129] In some embodiments, the sampling component 3 includes a carrier 31, a connecting piece 32, and a sampling line 33. The connecting piece 32 is mounted on the carrier 31, and the sampling line 33 and the battery cell 1 are electrically connected through the connecting piece 32.

[0130] By setting the carrier 31, it can be used to support the connecting piece 32 and the sampling line 33. Especially when there are multiple connecting pieces 32 and sampling lines 33, the carrier 31 can achieve relative fixation of multiple connecting pieces 32 and sampling lines 33.

[0131] In some embodiments, the support member 31 is made of plastic material. Plastic material has good hardness and can achieve good support under the same thickness conditions.

[0132] In some embodiments, the carrier 31 may be made of PET (Polyethylene terephthalate), PI (Polyimide), PP (Polypropylene), or PC (Polycarbonate). These materials are all polymers with good thermoplasticity.

[0133] As shown in Figure 8, in some embodiments, the sampling line 33 includes a main body segment 331 and a folded-back segment 332 that bends relative to the extension direction of the main body segment 331.

[0134] By setting the bent fold section 332, the length of the sampling line 33 can be increased, thereby increasing the resistance to the tensile force caused by the thermal expansion of the battery cell 1 on the sampling line 33. This effectively prevents the sampling line 33 from being pulled and broken when the battery cell 1 undergoes thermal expansion, effectively protecting the safety of the sampling line 33, thus ensuring the effectiveness of sampling and also helping to improve the service life of the battery device.

[0135] In some embodiments, the fold-back section 332 is integrally formed with the main body section 331, and the fold-back section 332 is the tail extension of the main body section 331.

[0136] The fold-back section 332 connects with the main body section 331 to form a U-shaped structure. The bend is an arc, which can prevent the sampling line 33 from breaking.

[0137] In some embodiments, the length of the fold-back segment 332 is 2mm to 10mm.

[0138] Setting the length of the fold-back section 332 to 2mm to 10mm, such as 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm, can make the fold-back section 332 have a better ability to resist the pulling force formed by the thermal expansion of the battery cell 1 on the sampling line 33, and can also facilitate the arrangement and fixation of the fold-back section 332.

[0139] In some embodiments, the thickness of the connecting piece 32 is 0.2 mm to 1 mm.

[0140] Setting the thickness of the connecting piece 32 to 0.2mm to 1mm, such as 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm, can not only give the connecting piece 32 good electrical connection performance, but also allow the welding laser to penetrate the connecting piece 32 to reach the battery cell 1, so as to realize the one-time welding connection of the busbar 2, the sampling component 3 and the battery cell 1.

[0141] In this embodiment, the shape and number of connecting pieces 32 can be flexibly set according to requirements.

[0142] In some embodiments, the thickness of bus 2 is 0.8 mm to 3 mm.

[0143] Setting the thickness of busbar 2 to 0.8mm to 3mm, such as 0.8mm, 0.9mm, 1mm, 1.5mm, 2mm, 2.5mm or 3mm, can give busbar 2 both good strength and good electrical connection performance.

[0144] In some embodiments, the first through hole 311, the second through hole 312 and the third through hole 42 can be circular, square or other shapes that match the shape of the corresponding protrusion.

[0145] In some embodiments, the first through hole 311, the second through hole 312 and the third through hole 42 are all circular with a diameter of 3mm to 6mm, such as 3mm, 4mm, 5mm or 6mm.

[0146] The structure of one embodiment of the battery device provided in this application will be described below.

[0147] As shown in Figure 3, the battery device includes a battery cell 1, a busbar 2, and a sampling component 3.

[0148] There are multiple battery cells 1, and one busbar 2 and one sampling component 3.

[0149] Multiple battery cells 1 are arranged side by side, and the sampling component 3 is set between the multiple battery cells 1 and the busbar 2.

[0150] As shown in Figures 4 and 5, busbar 2 has multiple electrical connections.

[0151] The sampling component 3 includes a carrier 31, connecting pieces 32, and sampling lines 33. The shape of the carrier 31 is the same as that of the module formed by arranging multiple battery cells 1 side by side. Multiple connecting pieces 32 are provided on the carrier 31, and each connecting piece 32 extends a sampling line 33. The ends of the multiple sampling lines 33 converge at one point. The connecting pieces 32 are used to realize the electrical connection between the busbar 2 and the battery cells 1. Multiple battery cells 1 can be connected in series through the busbar 2.

[0152] The sampling line 33 has a fold-back section at its tail end, which can better release the tensile stress on the sampling line 33 caused by the thermal expansion of the battery cell 1, protect the sampling line 33 from tensile damage, and thus improve the service life of the battery device.

[0153] The battery cell 1 has a terminal post 11, and the connecting piece 32 is electrically connected to the terminal post 11.

[0154] As shown in Figures 6 and 7, the battery device also includes a bracket 4, which is mounted on the battery cell 1, and the sampling component 3 is mounted on the bracket 4.

[0155] The sampling component 3 is provided with a second through hole 312, and the bracket 4 is provided with a second protrusion 41. The sampling component 3 is fitted onto the second protrusion 41 through the second through hole 312.

[0156] The bracket 4 is provided with a third through hole 42, and the battery cell 1 is provided with a third protrusion 13. The bracket 4 is fitted onto the third protrusion 13 through the third through hole 42.

[0157] As shown in Figure 8, the sampling line 33 includes a main body section 331 and a foldback section 332. By setting the foldback section 332, the length of the sampling line 33 can be increased, which can overcome the pulling of the sampling line 33 when the battery cell 1 undergoes thermal expansion, effectively protect the sampling line 33, and improve the life of the sampling line 33.

[0158] The sampling line connection method used in the battery device provided in this application can be applied to fields such as power batteries, energy storage batteries, electronic appliances, and mechanical devices.

[0159] In the battery device provided in this application, the connecting piece 32 and the sampling line 33 are first fixed to the carrier 31 to form a sampling assembly 3. Then, the sampling assembly 3 is installed on the bracket 4, and the bracket 4 is installed on the battery cell 1. Finally, the busbar 2 is placed on the sampling assembly 3. After assembly, the stacked structure composed of the busbar 2, the sampling assembly 3, and the battery cell 1 is simultaneously laser-welded. The laser energy penetrates the busbar 2 and the sampling assembly 3 and reaches the terminal post 11 of the battery cell 1, thereby realizing the simultaneous welding of the busbar 2, the sampling assembly 3, and the battery cell 1, completing the series connection and sampling of multiple battery cells 1.

[0160] This application embodiment, through structural modification of the sampling component 3 and the battery cell 1, enables the busbar 2, the sampling component 3 and the battery cell 1 to be connected through a single welding process, effectively improving manufacturing efficiency, reducing equipment investment costs and minimizing floor space.

[0161] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0162] Those skilled in the art will understand that, in the methods described in the specific embodiments, the order in which the steps are written does not imply a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of each step should be determined by its function and possible internal logic.

[0163] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. 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 device, comprising: Multiple battery cells (1) are used to provide electrical energy; Busbar (2) is used to realize the electrical connection of multiple battery cells (1); and A sampling component (3) is disposed between the battery cell (1) and the busbar (2), and the battery cell (1), the busbar (2) and the sampling component (3) are configured to be connected by a single welding.

2. The battery device according to claim 1, wherein, The battery cell (1) includes a terminal post (11), and the terminal post (11), the busbar (2) and the sampling assembly (3) are configured to be connected by a single welding process.

3. The battery device according to claim 1 or 2, wherein, The sampling component (3) is provided with a first through hole (311), and the battery cell (1) is provided with a first protrusion (12). The sampling component (3) is fitted onto the first protrusion (12) through the first through hole (311).

4. The battery device according to any one of claims 1 to 3, wherein, The battery device also includes a bracket (4), which is mounted on the battery cell (1), and the sampling component (3) is mounted on the bracket (4).

5. The battery device according to claim 4, wherein, The sampling component (3) is provided with a second through hole (312), and the bracket (4) is provided with a second protrusion (41). The sampling component (3) is fitted onto the second protrusion (41) through the second through hole (312).

6. The battery device according to claim 4 or 5, wherein, The bracket (4) is provided with a third through hole (42), and the battery cell (1) is provided with a third protrusion (13). The bracket (4) is fitted onto the third protrusion (13) through the third through hole (42).

7. The battery device according to any one of claims 1 to 6, wherein, The sampling component (3) includes a carrier (31), a connecting piece (32) and a sampling line (33). The connecting piece (32) is mounted on the carrier (31), and the sampling line (33) and the battery cell (1) are electrically connected through the connecting piece (32).

8. The battery device according to claim 7, wherein, The support component (31) is made of plastic material.

9. The battery device according to claim 7 or 8, wherein, The sampling line (33) includes a main body segment (331) and a folded-back segment (332) that bends relative to the extension direction of the main body segment (331).

10. The battery device according to claim 9, wherein, The length of the folded section (332) is 2mm to 10mm.

11. The battery device according to any one of claims 7 to 10, wherein, The thickness of the connecting piece (32) is 0.2 mm to 1 mm.

12. The battery device according to any one of claims 7 to 11, wherein, The thickness of the busbar (2) is 0.8 mm to 3 mm.

13. An electrical appliance comprising a battery device as described in any one of claims 1 to 12, the battery device being configured to supply electrical energy to the electrical appliance.

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