Battery device and electric device

Abstract

The invention is suitable for the technical field of batteries, and provides a battery device and a power utilization device. The battery device comprises a confluence component and a plurality of battery monomers, two adjacent battery monomers are electrically connected through the confluence component, the confluence component comprises a first connecting part and a second connecting part, the first connecting part and the second connecting part are made of different materials, and the first connecting part and the second connecting part are arranged side by side and butted; in the same confluence component, one of the first connecting part and the second connecting part is made of the same material and is connected with the positive electrode output part of one battery monomer, and the other one of the first connecting part and the second connecting part is made of the same material and is connected with the negative electrode output part of the other battery monomer. The connecting face of the first connecting part and the second connecting part is an inclined face, and an included angle is formed between the inclined face and the thickness direction of the confluence component. According to the battery device and the power utilization device provided by the invention, on the premise that the thickness of the confluence component is not changed, the structure of the confluence component is stable, and the process end manufacturing difficulty of the battery device can be reduced.

Description

Technical Field

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

[0002] Multiple battery cells are connected in series, parallel, or in a mixed configuration via a busbar assembly. In related technologies, it is difficult to achieve structural stability in the busbar assembly without altering its thickness, and also to reduce the manufacturing complexity of the battery device. Summary of the Invention

[0003] In view of the above problems, this application provides a battery device and an electrical device, which aims to make the structure of the current collector stable without changing the thickness of the current collector, and to reduce the manufacturing difficulty of the battery device.

[0004] In a first aspect, embodiments of this application provide a battery device, including a busbar and a plurality of battery cells. Adjacent battery cells are electrically connected through the busbar. The busbar includes a first connecting portion and a second connecting portion. The first connecting portion and the second connecting portion are made of different materials. The first connecting portion and the second connecting portion are arranged side by side and connected in a composite manner. In the same busbar, one of the first connecting portion and the second connecting portion is made of the same material as and connected to the positive electrode output portion of one battery cell, and the other of the first connecting portion and the second connecting portion is made of the same material as and connected to the negative electrode output portion of another battery cell. The connecting surface of the first connecting portion and the second connecting portion is an inclined plane, and the inclined plane forms an angle with the thickness direction of the busbar. The battery cell is a pouch cell, and the positive electrode output portion and the negative electrode output portion are flexible components that can fit into the corresponding connecting portion.

[0005] In this scheme, one of the first and second connecting parts in the busbar component is made of the same material as and connected to the positive output part of a battery cell, while the other of the first and second connecting parts is made of the same material as and connected to the negative output part of another battery cell. This allows the first and second connecting parts to be welded to their respective output parts using the same material, making the welding of the busbar component to the output parts easy, producing good welding quality, and reducing welding costs. Although the first and second connecting parts in the busbar component are made of different materials, their connection is mass-produced and can be completed in a closed, clean, and highly controllable dedicated factory, resulting in a clean interface, high bonding strength, and stable performance. Based on these reasons, the battery device provided in this application, with the first and second connecting parts arranged side-by-side and compositely connected, makes the manufacturing process of the battery device easier to implement, more economical, and more reliable, helping to reduce the manufacturing difficulty of the battery device's process.

[0006] In addition, the first and second connecting parts are arranged side by side and connected. Firstly, compared to coating only the first connecting part with a copper layer, the second connecting part can be thicker, resulting in greater mechanical strength. When welding with the negative terminal, the second connecting part is less likely to be soldered through, thus ensuring stable performance of the battery device. Secondly, the thickness of the busbar component can be made comparable to the thickness of a single connecting part, without increasing the thickness of the busbar component. Thirdly, the connection surface between the first and second connecting parts is a slope, resulting in a larger connection area between the first and second connecting parts, thus ensuring a stable connection between the second and first connecting parts.

[0007] In some possible implementations of the first aspect, the first connecting portion includes a first main body and a first protrusion, the first protrusion being disposed on the side of the first main body near the second connecting portion. The second connecting portion includes a second main body and a second protrusion, the second protrusion being disposed on the side of the second main body near the first connecting portion. The second protrusion and the first protrusion are stacked and connected in the thickness direction of the busbar component. In the same busbar component, one of the first main body and the second main body is made of the same material as and connected to the positive electrode output portion of a battery cell, and the other of the first main body and the second main body is made of the same material as and connected to the negative electrode output portion of another battery cell. The connecting surface of the first protrusion and the second protrusion is an inclined plane, the inclined plane forming an angle with the thickness direction of the busbar component. This allows for a larger connecting area between the first connecting portion and the second connecting portion, resulting in a stable connection between them.

[0008] In some possible implementations of the first aspect, the included angle is greater than or equal to ° and less than 9°.

[0009] This allows for a larger area of ​​the connection surface between the first and second connecting parts, resulting in a more stable connection between the second and first connecting parts.

[0010] In some possible implementations of the first aspect, in the first direction, the dimensions of both the first protrusion and the second protrusion are less than or equal to 1 / 3 of the dimension of the busbar component. The first direction is the arrangement direction of the first connecting portion and the second connecting portion.

[0011] This allows the first and second main bodies to be comprised of one or more portions of the busbar component, resulting in larger volumes for both main and second main bodies, facilitating their connection to the positive or negative output portion. In some possible implementations of the first aspect, the first and second main bodies have the same thickness.

[0012] This allows both the first and second main body parts to have a larger thickness, making them less prone to being welded through.

[0013] In some possible implementations of the first aspect, the first connecting part and the second connecting part are arranged side by side along a first direction, which is the width direction or the length direction of the merging component.

[0014] The first and second connecting parts are designed and manufactured in the width or length direction of the busbar component.

[0015] In some possible implementations of the first aspect, the first connecting part has a first surface connected to the output part, and the second connecting part has a second surface connected to the output part. In the first direction, the size of the first surface and the size of the second surface differ from the size of the first surface or the second surface by less than or equal to 1 / 4 of the size of the first surface or the second surface.

[0016] This allows both the first and second surfaces to have larger dimensions, making it easier for them to connect to the output section.

[0017] In some possible implementations of the first aspect, the first and second surfaces have the same dimensions in the first direction.

[0018] The first surface and the second surface have the same dimensions in the first direction, which allows both the first surface and the second surface to have relatively large dimensions, making it easier for them to be connected to the output section.

[0019] In some possible implementations of the first aspect, the first surface and the second surface lie in the same plane.

[0020] This design ensures that at least one side of the busbar component is flat, facilitating installation and storage. Furthermore, it allows the two output sections connected to the same busbar component to be at roughly the same height after the output section is welded to it, which facilitates the arrangement of other structures within the battery device.

[0021] In some possible implementations of the first aspect, the battery device further includes a housing, with at least a portion of the battery cell disposed within the housing. The battery cell includes a main body and an output portion connected to the main body. The main body has a first surface, which is the surface where the main body and the output portion are connected. The battery device also includes a separator plate disposed within the housing and spaced apart from or in contact with the first surface. A current-combining component is fixed to the side of the separator plate opposite to the main body. The separator plate has a through structure for the output portion of the battery cell to pass through, and the output portion is electrically connected to the current-combining component.

[0022] Because the output section is loose and redundant, it is prone to bending towards the electrode assembly, causing intercalation and potentially leading to internal short circuits and battery failure. The isolation plate, however, restricts the position of the output section, providing some restraint and reducing the risk of looseness and bending towards the electrode assembly.

[0023] In some possible implementations of the first aspect, at least one of the first connecting part and the second connecting part is provided with a fixing structure between itself and the isolation plate, and the busbar component is connected to the isolation plate through the fixing structure.

[0024] The fixed structure allows the busbar and the isolation plate to be combined into a whole, facilitating the overall movement and installation of both.

[0025] In some possible implementations of the first aspect, the fixing structure includes a first protruding structure and a through-hole structure that fit together, the through-hole structure being disposed in the first connecting part and / or the second connecting part, and the first protruding structure being disposed in the partition plate.

[0026] The fixing structure includes a first protruding structure and a through-hole structure that fit together, which is simple in structure and easy to assemble. Furthermore, since the separator is generally made of plastic, the manufacturing cost is low. The first protruding structure is located on the separator, and the through-hole structure is located on the first connecting part and / or the second connecting part, which can reduce the manufacturing cost of the battery device.

[0027] In some possible implementations of the first aspect, the isolation plate is provided with a groove, and at least a portion of the busbar is disposed within the groove.

[0028] At least a portion of the busbar is disposed within the recess, which allows for a smaller thickness of the combined structure of the busbar and separator, thus reducing the space occupied by the combined structure and enabling more space in the battery pack to be used for the arrangement of individual battery cells. Furthermore, the recess also allows for the definition of the busbar's position, ensuring that the busbar is installed within a predetermined area, thereby improving production efficiency.

[0029] In some possible implementations of the first aspect, the grooves and through structures are spaced apart along a first direction. The first direction is the arrangement direction of the first connecting portion and the second connecting portion.

[0030] The spacing between the grooves and the through-structure reduces the superposition of two stress concentration sources. Stress can be redistributed and alleviated in the material of the spacer between the grooves and the through-structure, significantly reducing stress peaks. Compared to a direct connection between the grooves and the through-structure, the spacing allows for higher mechanical strength in the partition plate, making it less prone to damage.

[0031] In some possible implementations of the first aspect, the battery device further includes a sampling line, and one of the first and second connecting parts is provided with a third connecting part, which is electrically connected to the sampling line.

[0032] The solution provided in this embodiment helps to make the battery device work safely, stably and efficiently.

[0033] In some possible implementations of the first aspect, the third connecting part is integrally formed with the first connecting part or the second connecting part.

[0034] This ensures a stable connection between the third connecting part and the first or second connecting part, and also facilitates processing.

[0035] Secondly, embodiments of this application provide an electrical device, including the battery device provided by any of the above solutions.

[0036] The effect of the second aspect is the same as that of the first aspect, so it will not be repeated here.

[0037] 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

[0038] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. 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: Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments; Figure 2 This is an exploded view of the battery device provided in some embodiments of this application; Figure 3 This is a side view of a battery device provided in some embodiments of this application; Figure 4 For along Figure 3 Schematic diagram of the cross-sectional structure along line AA; Figure 5 for Figure 4 A magnified schematic diagram of the local structure at point B; Figure 6 This is a schematic diagram of the structure of a busbar component in a battery device provided in some embodiments of this application; Figure 7 For along Figure 6 Schematic diagram of the cross-sectional structure of the middle BB line; Figure 8 An exploded structural diagram of a portion of the battery device provided in some embodiments of this application; Figure 9 for Figure 3 A magnified schematic diagram of the structure at point A in the middle.

[0039] The reference numerals in the detailed embodiments are as follows: 1000, vehicles; 100. Battery assembly; 200. Controller; 300. Motor; 10. Housing; 11. First housing; 12. Second housing; 13. Slide rail; 20. Battery cell; 21. Main body; 21a. First surface; 22. Output part; 22a. Positive output part; 22b. Negative output part; 30. Busbar component; 31. First connecting part; 31a. First surface; 311. First main body; 312. First protrusion; 32. Second connecting part; 32a. Second surface; 321. Second main body; 322. Second protrusion; 33. Connecting surface; 34. Third connecting part; 40. Sampling line; 50. Isolation plate; 51. Through structure; 52. Groove; 53. Second protrusion structure; 60. Fixing structure; 61. First protrusion structure; 62. Through hole structure; 70. Connector; X, first direction; Z, thickness direction. Detailed Implementation

[0040] 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.

[0041] 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.

[0042] 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. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0043] 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.

[0044] 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.

[0045] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0046] 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.

[0047] In the description of the embodiments of this application, unless otherwise expressly specified and limited, 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.

[0048] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0049] The capacity or power of a single battery cell is limited and often cannot meet the needs of some equipment or devices. Therefore, many devices incorporate multiple battery cells, increasing the battery's capacity or power by connecting them in series, parallel, or a combination thereof. Multiple battery cells are connected in series, parallel, or a combination via a busbar. In related technologies, the busbar is made of a single material, such as aluminum or copper. However, for pouch cells, the positive electrode tab is aluminum and the negative electrode tab is copper. When connecting them via a busbar, if the busbar is aluminum, connecting it to the positive electrode tab is easy, but connecting it to the negative electrode tab is difficult, leading to manufacturing challenges.

[0050] If the busbar is made into a structure where copper and aluminum bars are connected, the copper and aluminum bars usually need to be overlapped and welded, which will increase the thickness of the busbar and make it difficult to use in environments with limited space.

[0051] In other words, with existing technology, it is difficult to make the busbar structure stable and reduce the manufacturing difficulty of the battery device without changing the thickness of the busbar.

[0052] To address the aforementioned issues, this application provides a battery device. In this battery device, one of the first and second connecting portions in the busbar component is made of the same material as and connected to the positive electrode output portion of a single battery cell, while the other of the first and second connecting portions is made of the same material as and connected to the negative electrode output portion of another single battery cell. This allows the first and second connecting portions to be welded to their respective output portions using the same material, making the welding of the busbar component to the output portion easier, resulting in better welding quality and lower welding costs. Although the first and second connecting portions in the busbar component are made of different materials, their connection is mass-produced and can be completed in a closed, clean, and highly controllable dedicated factory, resulting in a clean interface, high bonding strength, and stable performance. Based on these reasons, using the battery device provided in this application, with the first and second connecting portions arranged side-by-side and compositely connected, makes the manufacturing process of the battery device easier to implement, more economical, and more reliable, helping to reduce the manufacturing difficulty of the battery device's process.

[0053] The battery cells disclosed in this application can be used in battery devices and electrical devices that use the battery cells as a power source, or in various energy storage devices, energy storage systems, and charging networks that use batteries as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0054] 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.

[0055] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is provided 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 controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0056] 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.

[0057] Please refer to Figure 2 , Figure 2 This is an exploded structural diagram of a battery device 100 provided in some embodiments of this application. The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells 20, which are connected in series, parallel, or mixed connection via a busbar.

[0058] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells 20.

[0059] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 20 together to form an independent module. As an example, a battery module can be formed by bundling multiple battery cells 20 together with cable ties.

[0060] In some embodiments, the battery device 100 may be a battery pack, which includes a housing 10 and one or more battery cell assemblies housed within the housing 10.

[0061] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing 10 by fixing the battery module in the housing 10.

[0062] As an example, the battery cell assembly can also be housed in the housing 10 by directly fixing multiple battery cells 20 to the housing 10.

[0063] As an example, the housing 10 may include a first housing 11 and a second housing 12. The first housing 11 and the second housing 12 are fastened together to form a closed space inside the housing 10 to house the battery cell assembly. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing 11 may be a top cover or a bottom plate.

[0064] As an example, the housing 10 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 10 forms an enclosed space to accommodate the battery cell assembly.

[0065] In some embodiments, the housing 10 may be part of the vehicle's chassis structure. For example, a portion of the housing 10 may be at least a portion of the vehicle's floor, or a portion of the housing 10 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0066] In the battery device 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is placed within the receiving space defined by the first housing 11 and the second housing 12. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed configuration to form a battery module, and then multiple battery modules connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within the receiving space defined by the first housing 11 and the second housing 12. The battery device 100 may also include other structures.

[0067] In this embodiment, the battery cell 20 can be a secondary battery cell, such as a lithium-ion battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and this embodiment is not limited thereto. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes, and this embodiment is not limited thereto.

[0068] Please refer to Figure 2 The battery cell 20 can be a pouch battery cell.

[0069] A pouch battery cell refers to a battery cell that uses a flexible packaging film (such as aluminum-plastic film) as its outer casing. Compared to battery cells with metal casings, pouch battery cells are lighter and have a more versatile external shape.

[0070] The flexible packaging film of the pouch battery cell forms a cavity by encapsulation. The cavity is used to accommodate the electrode assembly and electrolyte. One or both sides of the electrode assembly are provided with electrode leads of opposite polarity. The electrode leads are used to lead out the current generated by the electrode assembly. A part of the electrode lead extends out of the flexible packaging film through the sealing edge formed by the flexible packaging film and is electrically connected to other devices (e.g., the electrode leads of other pouch battery cells).

[0071] Specifically, the aforementioned electrode assembly is the component in the battery where the electrochemical reaction occurs. The electrode assembly is formed by winding or stacking a positive electrode, a negative electrode, and a separator disposed between the positive and negative electrodes. The active material portions of both the positive and negative electrodes constitute the main body 21 of the electrode assembly, while the non-active material portions of both electrodes constitute tabs. These tabs are the electrode leads, serving as the current transmission terminals of the electrode assembly, also called output sections 22, used for transmitting current. The tab on the positive electrode is called the positive tab, and the tab on the negative electrode is called the negative tab. The positive and negative tabs can be located together at one end of the main body 21 or at opposite ends of the main body 21. These tabs are flexible and can be bent as needed.

[0072] Figure 3 This is a side view of the battery device provided in some embodiments of this application. Figure 4 For along Figure 3 Schematic diagram of the cross-sectional structure along line AA. Figure 5 for Figure 4 A magnified structural diagram of section B in the middle. Please refer to... Figures 3 to 5 This application provides a battery device. The battery device includes a busbar 30 and a plurality of battery cells 20. Adjacent battery cells 20 are electrically connected through the busbar 30.

[0073] Figure 6 This is a schematic diagram of the structure of a busbar component in a battery device provided in some embodiments of this application. Figure 7 For along Figure 6 A schematic diagram of the cross-sectional structure along the middle BB line. Please refer to... Figures 5 to 7 The busbar component 30 includes a first connecting portion 31 and a second connecting portion 32. The first connecting portion 31 and the second connecting portion 32 are made of different materials. The first connecting portion 31 and the second connecting portion 32 are arranged side by side and connected together. In the same busbar component 30, one of the first connecting portion 31 and the second connecting portion 32 is made of the same material as and connected to the positive electrode output portion 22a of one battery cell 20, and the other of the first connecting portion 31 and the second connecting portion 32 is made of the same material as and connected to the negative electrode output portion 22b of another battery cell 20.

[0074] The connecting surface 33 of the first connecting part 31 and the second connecting part 32 is an inclined surface. The inclined surface forms an angle with the thickness direction of the current collector 30. The battery cell 20 is a pouch battery cell 20, and the positive electrode output part 22a and the negative electrode output part 22b are flexible parts that can fit into the corresponding connecting parts.

[0075] A busbar 30 is a conductive component used to combine multiple current paths to a common point or to distribute a total current to multiple branches; it is commonly known as a current collector. The core function of the busbar 30 is to collect and distribute current, enabling efficient and stable current transmission. In a battery device, the busbar 30 is responsible for connecting numerous individual battery cells 20 in parallel and series to form a complete battery module, and for drawing out the positive and negative terminals from it.

[0076] "Parallel arrangement" means that the first connecting part 31 and the second connecting part 32 are arranged in the same direction, adjacent to each other, and on the same plane or the same line. They are laterally adjacent, rather than in a front-to-back or top-to-bottom relationship.

[0077] The parallel arrangement of the connecting parts refers to the first connecting part 31 and the second connecting part 32 being arranged side by side, with their sidewalls contacting and connecting. It should be noted that in this embodiment, the two sidewalls of the first connecting part 31 and the second connecting part 32 that are in contact can be planes extending along the thickness direction of the confluence component 30, or non-planar structures with protrusions, recesses, steps, etc., depending on the connection requirements. In this embodiment, the connection method of the first connecting part 31 and the second connecting part 32 is a composite connection, which can be determined according to the usage requirements. Composite connection methods include, but are not limited to: ultrasonic riveting / pressing, brazing, friction welding, casting welding, mechanical pressing, etc. Among them, casting welding is a liquid-solid composite process. Its core principle is: a metal (usually a metal with a higher melting point and greater stability) is pre-made into a solid insert, then placed in a mold, and then another molten metal is poured in. The heat of the liquid metal causes the surface of the solid metal to slightly melt, and the two are metallurgically bonded during the subsequent solidification process. First, one of the first connecting parts 31 and the second connecting part 32 is prepared into a solid state. Then, with the help of a mold, the solidified connecting part is placed into the mold, and liquid material for preparing the other connecting part is poured into the mold. Then, the other connecting part is prepared into a solid state by a curing process. After the forming is completed, the connecting surfaces 33 of the first connecting part 31 and the second connecting part 32 are naturally connected.

[0078] The positive electrode output section 22a is the positive electrode portion of the battery cell 20 located outside the casing of the battery cell 20, and is used to connect to the busbar component 30. The negative electrode output section 22b is the negative electrode portion of the battery cell 20 located outside the casing of the battery cell 20, and is used to connect to the busbar component 30. In this embodiment, the positive electrode output section and the negative electrode output section are made of different materials.

[0079] The battery cell 20 can be a pouch battery cell. The positive output part is the positive electrode tab, and the negative output part is the negative electrode tab. Both are flexible parts that can be bent into different directions as needed.

[0080] The busbar component 30 is directly welded to the positive or negative output portion of the battery cell 20. Since both the positive and negative output portions in this embodiment are flexible components, they can be bent as needed. Therefore, when the positive and negative output portions are connected to the busbar component 30, they can fit tightly against it. Compared to using rigid materials for the positive and negative output portions, this eliminates gaps or minimizes them between the positive and negative output portions and the busbar component 30, facilitating welding and resulting in better welding performance.

[0081] Because aluminum has a high positive electrode potential and is relatively stable at high potentials, the positive electrode output section 22a is generally made of aluminum (Al). Conversely, copper has a low negative electrode potential and is stable and has good conductivity at low potentials; therefore, the negative electrode output section 22b is generally made of copper (Cu). In this embodiment, one of the first connecting part 31 and the second connecting part 32 is made of the same material as the positive electrode output section 22a of one battery cell 20, and the other of the first connecting part 31 and the second connecting part 32 is made of the same material as the negative electrode output section 22b of another battery cell. That is, one of the first connecting part 31 and the second connecting part 32 can be made of aluminum alloy or existing aluminum bars or aluminum busbars, and the other of the first connecting part 31 and the second connecting part 32 can be made of copper alloy or existing copper bars or copper busbars.

[0082] The first connecting portion 31 and the second connecting portion 32 are connected sideways. The connecting surface 33 of the first connecting portion 31 and the second connecting portion 32 is a slope, meaning that the side of the first connecting portion 31 that contacts the second connecting portion 32 is a slope, and the side of the second connecting portion 32 that contacts the first connecting portion 31 is also a slope. The slope can be a straight plane, or it can be a wavy surface microscopically but appear flat to the naked eye.

[0083] Using the solution provided in this embodiment, one of the first connecting portion 31 and the second connecting portion 32 in the busbar component 30 is made of the same material as and connected to the positive electrode output portion 22a of a battery cell 20, while the other of the first connecting portion 31 and the second connecting portion 32 is made of the same material as and connected to the negative electrode output portion 22b of another battery cell. This allows the first connecting portion 31 and the second connecting portion to be welded to their respective output portions using the same material, making the welding of the busbar component 30 to the output portions easy to operate, resulting in good welding quality and low welding cost. Although the first connecting portion 31 and the second connecting portion 32 in the busbar component 30 are made of different materials, the connection between the first connecting portion 31 and the second connecting portion 32 is mass-produced and can be completed in a closed, clean, and highly controllable dedicated factory, resulting in a clean interface, high bonding strength, and stable performance. Based on the above reasons, using the battery device provided in this embodiment, with the first connecting portion 31 and the second connecting portion 32 arranged side-by-side and docked, makes the manufacturing process of the battery device easier to implement, more economical, and more reliable, helping to reduce the manufacturing difficulty of the battery device's process.

[0084] In addition, the first connecting portion 31 and the second connecting portion 32 are arranged side by side and connected. Firstly, compared to coating only the first connecting portion 31 with a copper layer, the second connecting portion 32 can be thicker, resulting in greater mechanical strength. This makes the second connecting portion 32 less prone to burn-through during welding to the negative terminal, thus ensuring stable battery device performance. Secondly, the thickness of the busbar component 30 can be comparable to the thickness of a single connecting portion, without increasing the overall thickness of the busbar component 30. Thirdly, the connection surface 33 of the first connecting portion 31 and the second connecting portion 32 is beveled, resulting in a larger connection area and a more stable connection between the second connecting portion 32 and the first connecting portion 31. In some embodiments, the first connecting portion 31 and the second connecting portion 32 are joined by a casting-welding composite connection. This allows for a relatively large composite interface area between the first connecting portion 31 and the second connecting portion 32. In the battery device, this translates to lower contact resistance and better current carrying capacity, and the connector is less prone to overheating.

[0085] like Figure 7As shown, in some embodiments, the first connecting portion 31 includes a first main body portion 311 and a first protrusion 312. The first protrusion 312 is disposed on the side of the first main body portion 311 near the second connecting portion 32. The second connecting portion 32 includes a second main body portion 321 and a second protrusion 322. The second protrusion 322 is disposed on the side of the second main body portion 321 near the first connecting portion 31. The second protrusion 322 and the first protrusion 312 are stacked and connected in the thickness direction of the busbar component 30. In the same busbar component 30, one of the first main body portion 311 and the second main body portion 321 is made of the same material as and connected to the positive electrode output portion 22a of the output portion of one battery cell 20, and the other of the first main body portion 311 and the second main body portion 321 is made of the same material as and connected to the negative electrode output portion 22b of another battery cell 20.

[0086] The connecting surface 33 of the first protrusion 312 and the second protrusion 322 is an inclined surface. The inclined surface forms an angle θ with the thickness direction Z of the busbar component 30. The angle θ is greater than 0° and less than 90°. For example, the angle θ can be 10°, 20°, 30°, 40°, 45°, 50°, 55°, 60°, 66°, 70°, 76°, 80°, 85°, etc. In this embodiment, the first connecting part 31 may only include the first main body part 311 and the first protrusion 312, or it may include other structures in addition to the first main body part 311 and the first protrusion 312, depending on the usage requirements. The first main body part 311 and the first protrusion 312 can be integrally formed or separately connected, such as by welding, plugging, or other methods. Among them, the first main body part 311 is the main structure of the first connecting part 31, which is used to weld to the positive output part 22a or the negative output part 22b. The first protrusion 312 is a structure in the first connecting part 31 used to connect with the second connecting part 32. It can be a cubic protrusion, a triangular protrusion, a hemispherical protrusion, or a protrusion structure of other shapes, which can be determined according to the needs of use.

[0087] The second connecting portion 32 may consist only of the second main body portion 321 and the second protrusion 322, or it may include other structures in addition to the second main body portion 321 and the second protrusion 322, depending on the application requirements. The second main body portion 321 and the second protrusion 322 may be integrally formed or connected separately, such as by welding, plugging, or other methods. The second main body portion 321 is the main structure of the second connecting portion 32, used for welding to the positive output portion 22a or the negative output portion 22b. The second protrusion 322 is the structure in the second connecting portion 32 used for connecting to the first connecting portion 31, and may be a cubic protrusion, a triangular protrusion, a hemispherical protrusion, or a protrusion structure of other shapes, depending on the application requirements.

[0088] It should be noted that, Figure 7The dashed line L1 is the boundary line between the first main body 311 and the first protrusion 312, and the dashed line L2 is the boundary line between the second main body 321 and the second protrusion 322. It can be understood that the dashed lines L1 and L2 are auxiliary lines drawn for ease of understanding, and are not structural lines of the busbar component 30.

[0089] The second protrusion 322 and the first protrusion 312 are stacked and connected in the thickness direction of the busbar component 30, which means that the first protrusion 312 and the second protrusion 322 are stacked in the thickness direction Z of the busbar component 30 and then connected by a composite process.

[0090] This allows for a larger connection area between the first connecting part 31 and the second connecting part 32, resulting in a stable connection between the two.

[0091] In some embodiments, the included angle θ is greater than or equal to 45° and less than 90°. For example, the included angle can be 45°, 50°, 55°, 60°, 66°, 70°, 76°, 80°, 85°, etc.

[0092] This allows for a larger area of ​​the connecting surfaces of the first connecting part 31 and the second connecting part 32, resulting in a stable connection between the second connecting part 32 and the first connecting part 31.

[0093] like Figure 7 As shown, in some embodiments, in the first direction X, the dimensions of both the first protrusion 312 and the second protrusion 322 are less than or equal to 1 / 3 of the dimension of the busbar component 30. That is... Figure 7 In this context, a3 ≤ (a4) / 3. The first direction X is the arrangement direction of the first connecting part 31 and the second connecting part 32.

[0094] In the first direction X, the dimensions of the first protrusion 312 and the second protrusion 322 are generally the same.

[0095] In the first direction X, the dimensions of the first protrusion 312 and the second protrusion 322 are both less than or equal to 1 / 3 of the dimensions of the busbar 30. This allows the first main body 311 and the second main body 321 to be more than 2 / 3 of the busbar 30, which makes the volume of the first main body 311 and the second main body 321 larger, facilitating their connection with the positive output section 22a or the negative output section 22b.

[0096] like Figure 7 As shown, in some embodiments, the thickness of the first main body portion 311 and the second main body portion 321 is the same. That is, d1=d2 in the figure.

[0097] This allows both the first main body 311 and the second main body 321 to have a relatively large thickness, making them less likely to be welded through.

[0098] like Figure 7As shown, in some embodiments, the first connecting portion 31 and the second connecting portion 32 are arranged side by side along a first direction X. The first direction X is the width direction or the length direction of the busbar component 30.

[0099] The busbar component 30 is generally a three-dimensional structure, specifically in the length, width and thickness directions.

[0100] The first connecting part 31 and the second connecting part 32 are convenient to design and manufacture along the width or length direction of the busbar component 30.

[0101] like Figure 7 As shown, in some embodiments, the first connecting portion 31 has a first surface 31a connected to the positive output portion. The second connecting portion 32 has a second surface 32a connected to the negative output portion. In the first direction X, the size of the first surface 31a and the size of the second surface 32a differ from the size of either the first surface 31a or the second surface 32a by less than or equal to 1 / 4 of the size of either the first surface 31a or the second surface 32a.

[0102] The first surface 31a is the outer surface of the first connecting portion 31 that contacts and is connected to the positive output portion or the negative output portion. The second surface 32a is the outer surface of the second connecting portion 32 that contacts and is connected to the positive output portion or the negative output portion.

[0103] In the first direction X, the size of the first surface 31a and the size of the second surface 32a differ from each other by less than or equal to 1 / 4 of the size of the first surface 31a or the second surface 32a. This allows the sizes of both the first surface 31a and the second surface 32a to be relatively large, facilitating their connection to the output unit.

[0104] like Figure 7 As shown, in some embodiments, the first surface 31a and the second surface 32a have the same dimensions in the first direction X. That is... Figure 7 In this case, a1 = a2.

[0105] The first surface 31a and the second surface 32a have the same size in the first direction X, which makes the size of both the first surface 31a and the second surface 32a relatively large, making it easier for them to be connected to the output part.

[0106] like Figure 7 As shown, in some embodiments, the first surface 31a and the second surface 32a are located in the same plane.

[0107] This allows at least one side of the busbar component 30 to be flat, facilitating installation and storage. On the other hand, it ensures that the heights of the two output sections connected to the same busbar component 30 after welding are similar, which facilitates the arrangement of other structures in the battery device.

[0108] like Figure 7 As shown, in some embodiments, the absolute value of the difference between the thickness of the first connecting portion 31 and the thickness of the second connecting portion 32 is less than or equal to 1 / 3 of the thickness of the first connecting portion 31.

[0109] The thickness d1 of the first connecting portion 31 is the dimension of the first connecting portion 31 in the thickness direction Z. The thickness d2 of the second connecting portion 32 is also the dimension of the second connecting portion 32 in the thickness direction Z.

[0110] The thickness difference between the first connecting part 31 and the second connecting part 32 is less than 1 / 3 of the thickness of the first connecting part 31, which means that |d1-d2| is less than or equal to d1 / 3.

[0111] This allows for a larger thickness in the second connection portion 32, resulting in greater mechanical strength. When welding to the negative terminal, the second connection portion 32 is less likely to be burned through, thus ensuring stable performance of the battery device.

[0112] like Figure 7 As shown, in some embodiments, the maximum thickness of the first connecting portion 31 and the second connecting portion 32 is the same, i.e., d1=d2.

[0113] This ensures that the surface of the busbar component 30 is flat, making it easy to install and store.

[0114] like Figure 5 As shown, in some embodiments, the battery device further includes a housing 10, within which at least a portion of the battery cell 20 is disposed. The battery cell 20 includes a main body 21 and an output portion 22 connected to the main body 21. The main body 21 has a first surface 21a. The first surface 21a is the surface where the main body 21 connects to the output portion 22. The battery device also includes a separator 50. The separator 50 is disposed within the housing 10 and is spaced apart from or in contact with the first surface 21a. A busbar 30 is fixed to the side of the separator 50 facing away from the main body 21. A through structure 51 is provided on the separator 50. The through structure 51 allows the output portion 22 of the battery cell 20 to pass through. The output portion 22 is electrically connected to the busbar 30.

[0115] The main body 21 of the battery cell 20 is the part of the battery cell 20 excluding the output part 22.

[0116] The separator 50 is generally made of insulating material and can isolate the current collector 30 from the main body 21 of the battery cell 20. One or more separators 50 can be provided, depending on the arrangement of the output section 22. If the output section 22 is located at one end of the battery cell 20, then there is one separator 50, which is spaced apart from or in contact with the side of the main body 21 of the battery cell 20 where the output section 22 is located; if both ends of the battery cell 20 have output sections 22, then there are two separators 50, which are spaced apart from or in contact with the two sides of the main body 21 of the battery cell 20 where the output sections 22 are located.

[0117] "Separation" refers to a certain distance between the separator 50 and the first surface 21a of the main body 21 of the battery cell 20. "Contact" refers to at least partial contact between the separator 50 and the first surface 21a of the main body 21 of the battery cell 20.

[0118] The through structure 51 refers to a through hole or notch that penetrates the partition plate 50 along its thickness direction. The position and size of the through structure 51 can be determined according to the position and size of the output part 22.

[0119] Because the output section 22 is loose and redundant, it is prone to bending towards the electrode assembly, causing an insertion phenomenon that could lead to a short circuit inside the battery and battery failure. The isolation plate 50, however, can restrict the position of the output section 22, providing a certain degree of restraint and reducing the risk of looseness and bending towards the electrode assembly.

[0120] like Figure 8 As shown, in some embodiments, at least one of the first connecting portion 31 and the second connecting portion 32 is provided with a fixing structure 60 between itself and the isolation plate 50. The busbar component 30 is connected to the isolation plate 50 through the fixing structure 60.

[0121] At least one of the first connecting portion 31 and the second connecting portion 32 is provided with a fixing structure 60 between itself and the isolation plate 50, including at least the following schemes: First, the first connecting portion 31 is provided with a fixing structure 60 between itself and the isolation plate 50; Second, the second connecting portion 32 is provided with a fixing structure 60 between itself and the isolation plate 50; Third, both the first connecting portion 31 and the second connecting portion 32 are provided with a fixing structure 60 between themselves and the isolation plate 50.

[0122] The fixed structure 60 refers to the structure that can fix the busbar component 30 to the isolation plate 50. It can be a plug-in structure, a snap-fit ​​structure or other structures, depending on the application requirements.

[0123] The fixed structure 60 allows the busbar component 30 and the isolation plate 50 to be combined into a whole, facilitating the overall movement and installation of both.

[0124] like Figure 8 As shown, in some embodiments, the fixing structure 60 includes a first protruding structure 61 and a through-hole structure 62 that fit together. The through-hole structure 62 is provided on the first connecting portion 31 and / or the second connecting portion 32. The first protruding structure 61 is provided on the partition plate 50. The busbar component 30 is fixed to the partition plate 50 through the through-hole structure 62 and the first protruding structure 61 that fit together.

[0125] In this embodiment, the fixing structure 60 may include only the first protruding structure 61 and the through hole structure 62 that fit together, or it may include other structures in addition to the first protruding structure 61 and the through hole structure 62 that fit together, depending on the needs of use.

[0126] The through-hole structure 62 extends through the first connecting portion 31 and / or the second connecting portion 32 along the thickness direction. The shape of the through-hole structure 62 can be determined according to the shape of the first protruding structure 61. The first protruding structure 61 can be a protruding post, a second protruding structure 53, etc., and can be integrally formed with the isolation plate 50, or fixed to the isolation plate 50 by welding, plugging, or other methods. It is understood that the first protruding structure 61, like the isolation plate 50, is generally made of insulating material, so as not to adversely affect the current transmission of the busbar component 30.

[0127] The fixing structure 60 includes a first protrusion structure 61 and a through hole structure 62 that fit together, which is simple in structure and easy to assemble. In addition, since the separator 50 is generally made of plastic, the manufacturing cost is low. The first protrusion structure 61 is provided on the separator 50, and the through hole structure 62 is provided on the first connecting part 31 and / or the second connecting part 32, which can reduce the manufacturing cost of the battery device.

[0128] like Figure 5 and Figure 8 As shown, in some embodiments, the isolation plate 50 is provided with a groove 52. At least a portion of the busbar 30 is disposed within the groove 52.

[0129] The groove 52 is a continuous recessed feature formed on the partition plate 50 by cutting, casting, stamping, injection molding or other processing methods.

[0130] At least a portion of the busbar component 30 is disposed within the recess 52, which allows for a smaller thickness of the combined structure of the busbar component 30 and the separator 50. This helps to reduce the space occupied by the combined structure of the busbar component 30 and the separator 50, allowing as much space as possible in the battery device to be used for the arrangement of the battery cells 20. In addition, the recess 52 can also limit the position of the busbar component 30, allowing the installation position of the busbar component 30 to be located within a predetermined area, which helps to improve production efficiency.

[0131] like Figure 5 and Figure 8 As shown, in some embodiments, the groove 52 and the through structure 51 are spaced apart along a first direction X. The first direction X is the arrangement direction of the first connecting portion 31 and the second connecting portion 32.

[0132] The interval setting refers to maintaining a certain material interval between the groove 52 and the through structure 51, that is, the two are not directly connected, but are separated by a part of the whole material.

[0133] The spacing between the groove 52 and the through structure 51 reduces the superposition of two stress concentration sources. Stress can be redistributed and alleviated in the material of the spacer area between the groove 52 and the through structure 51, significantly reducing stress peaks. Compared to a direct connection between the groove 52 and the through structure 51, the spacing between them results in higher mechanical strength for the partition plate 50, making it less prone to damage.

[0134] In some embodiments, the isolation plate 50 is detachably connected to the housing 10.

[0135] Detachable connection refers to the connection method between the isolation plate 50 and the box 10 without damaging the isolation plate 50 and the box 10 when they are disassembled.

[0136] The isolation plate 50 is detachably connected to the enclosure 10, which facilitates the replacement and maintenance of the isolation plate 50 and the enclosure 10 respectively.

[0137] Figure 9 for Figure 3 A magnified schematic diagram of the structure at point A in the middle. (See diagram below.) Figure 9 As shown, in some embodiments, the inner wall of the housing 10 is provided with a slide rail 13. The partition plate 50 is provided with a second protrusion structure 53. The partition plate 50 is detachably connected to the housing 10 via the sliding engagement of the second protrusion structure 53 and the slide rail 13.

[0138] The slide 13 refers to a structure that provides guidance, constraint and support for the second protrusion structure 53, enabling it to slide along a specific path (usually a straight line or a specific curve).

[0139] The second protruding structure 53 can be a protrusion, a protruding post, etc., which can be determined according to the needs of use.

[0140] A sliding fit is a type of clearance fit structure. In this embodiment, the second protrusion structure 53 and the slide rail 13 have a certain dimensional difference, so that after they are assembled, there is a gap between the outer surface of the second protrusion structure 53 and the inner surface of the slide rail 13, which allows the two to produce smooth relative sliding motion.

[0141] The isolation plate 50 is detachably connected to the housing 10 via the sliding engagement of the second protrusion structure 53 and the slide rail 13, so that the position of the isolation plate 50 can be adjusted as needed, and the adjustment will not affect the relative position of the output section 22 and the through structure 51, which facilitates the connection between the output section 22 and the busbar component 30.

[0142] Figure 8 This is an exploded structural diagram of a portion of the battery device provided in some embodiments of this application. For example... Figure 8 As shown, in some embodiments, the battery device further includes a sampling line 40. One of the first connection portion 31 and the second connection portion 32 is provided with a third connection portion 34, which is electrically connected to the sampling line 40.

[0143] The sampling line 40 is used to monitor the voltage, temperature and other physical information of each battery cell 20 in the battery device in real time, and transmit this data to the battery management system to ensure that the battery device works safely, stably and efficiently.

[0144] The sampling line 40 may include a PCB (Printed Circuit Board), an FPC (Flexible Printed Circuit), or an FFC (Flexible Flat Cable).

[0145] The third connecting part 34 can be integrally formed with the first connecting part 31 or the second connecting part 32, or it can be electrically connected to the first connecting part 31 or the second connecting part 32 by means of welding, plugging, etc. The third connecting part 34 is used to connect with the sampling line 40, and the two can be connected by welding or by electrical connectors.

[0146] The solution provided in this embodiment helps to make the battery device work safely, stably and efficiently.

[0147] In some embodiments, the third connecting portion 34 is integrally formed with the first connecting portion 31 or the second connecting portion 32.

[0148] One-piece molding is a technology that produces multiple parts or complex structures as a whole seamlessly in a single processing or manufacturing process.

[0149] The third connecting part 34 is integrally formed with the first connecting part 31 or the second connecting part 32, which makes the connection between the third connecting part 34 and the first connecting part 31 or the second connecting part 32 stable and easy to process.

[0150] According to some embodiments of this application, this application also provides an electrical device, including a battery device provided by any of the above solutions. The battery device is used to store or provide electrical energy.

[0151] The electrical device can be any of the aforementioned battery-powered devices or systems.

[0152] The electrical device provided in this application embodiment includes the battery device described above and can achieve the same effect, which will not be repeated here.

[0153] like Figures 3 to 9As shown, one embodiment of this application provides a battery device. The battery device includes a housing 10, a current-combining component 30, and a plurality of battery cells 20. Each battery cell 20 is a pouch cell. Adjacent battery cells 20 are electrically connected via the current-combining component 30. The current-combining component 30 includes a first connecting portion 31 and a second connecting portion 32 arranged side-by-side and connected along a first direction X. In the same current-combining component 30, the first connecting portion 31 is made of the same material as and connected to the positive electrode output portion 22a of one battery cell 20, and the second connecting portion 32 is made of the same material as and connected to the negative electrode output portion 22b of another battery cell 20. The connection surface 33 of the first connecting portion 31 and the second connecting portion 32 is an inclined surface. The thickness of the first connecting portion 31 and the second connecting portion 32 is the same. At least a portion of the battery cell 20 is disposed within the housing 10. The battery cell 20 includes a main body portion 21 and an output portion 22 connected to the main body portion 21. The main body portion 21 has a first surface 21a, which is the surface where the main body portion 21 connects to the output portion 22. The battery assembly also includes a separator 50. The separator 50 is disposed within the housing 10 and is spaced apart from or in contact with the first surface 21a. A busbar component 30 is fixed to the side of the separator 50 facing away from the main body 21. A through structure 51 is provided on the separator 50. The through structure 51 is used for the output portion 22 of the battery cell 20 to pass through. The output portion 22 is electrically connected to the busbar component 30. A fixing structure 60 is provided between at least one of the first connecting portion 31 and the second connecting portion 32 and the separator 50. The busbar component 30 is connected to the separator 50 through the fixing structure 60. The fixing structure 60 includes a first protrusion structure 61 and a through hole structure 62 that fit together. The through hole structure 62 is provided in the first connecting portion 31 and / or the second connecting portion 32, and the first protrusion structure 61 is provided in the separator 50. The separator 50 is provided with a groove 52, and at least a portion of the busbar component 30 is disposed in the groove 52. The groove 52 and the through structure 51 are spaced apart along a first direction X. The isolation plate 50 is detachably connected to the housing 10. The inner wall of the housing 10 is provided with a slide rail 13, and the isolation plate 50 is provided with a second protrusion structure 53. The isolation plate 50 is detachably connected to the housing 10 via the sliding engagement of the second protrusion structure 53 and the slide rail 13. The battery device also includes a sampling line 40. One of the first connecting part 31 and the second connecting part 32 is provided with a third connecting part 34. The third connecting part 34 is electrically connected to the sampling line 40. The third connecting part 34 is integrally formed with either the first connecting part 31 or the second connecting part 32. The isolation plate 50 also has a groove for placing the sampling line 40. In addition, the battery device also includes a connector 70 that is electrically connected to the sampling line 40 and the battery cell 20 respectively. The connector 70 is used to connect the battery device to external electrical components.

[0154] The battery device provided in this embodiment offers a CCS with a copper-aluminum composite plate (i.e., the aforementioned busbar 30), which, together with the special output section 22 structure of the high-performance battery device, achieves a new welding structure.

[0155] By utilizing the flexible structure of the output section 22 of the high-performance battery cell 20, after assembling it with the CCS, the positive electrode output section 22a of the battery cell 20 is attached to the first connecting section 31 of the current collector 30 by folding the output section 22, and the negative electrode output section 22b of the battery cell 20 is attached to the second connecting section 32 of the current collector 30. The battery cell 20 is then fixed by welding to achieve electrical connection.

[0156] The aforementioned CCS stands for Cells Contact System, which integrates conductive sheets, sampling components (such as voltage sampling components and temperature acquisition components) in a battery device into a single module. It is used to realize the series and parallel connection between multiple battery cells 20, as well as the functions of temperature sampling, voltage sampling, and overcurrent fuse protection of the battery device.

[0157] Copper-aluminum composite connection technology is mature, with standardized products and processes (such as copper-aluminum transition joints), simple on-site construction, operability by ordinary workers, low manufacturing costs, and high connection reliability. In contrast, copper-aluminum welding (such as fusion welding and brazing) is a specialized welding process with extremely high technical barriers. It requires specialized equipment, special materials, and experienced welders. Process parameter control is extremely strict, equipment is expensive, specialized brazing filler / soldering materials are costly, and reliance on highly skilled technicians increases overall costs. Welding quality is highly dependent on the operator's skill and the on-site environment, easily resulting in brittle intermetallic compound layers and defects such as porosity and cracks. Based on these reasons, the battery device provided in this application, with the first connecting part 31 and the second connecting part 32 arranged side-by-side and compositely connected, makes the battery device manufacturing process easier to implement, more economical, and more reliable, helping to reduce the manufacturing difficulty of the battery device's process side.

[0158] 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 device, characterized in that, The device includes a current-combining component and multiple battery cells. Adjacent battery cells are electrically connected through the current-combining component. The current-combining component includes a first connecting portion and a second connecting portion. The first connecting portion and the second connecting portion are made of different materials. The first connecting portion and the second connecting portion are arranged side by side and connected together. In the same current-combining component, one of the first connecting portion and the second connecting portion is made of the same material as and connected to the positive electrode output portion of one battery cell, and the other of the first connecting portion and the second connecting portion is made of the same material as and connected to the negative electrode output portion of another battery cell. The connecting surfaces of the first connecting part and the second connecting part are inclined surfaces, and the inclined surfaces form an angle with the thickness direction of the busbar component; The battery cell is a pouch cell, and the positive and negative output portions are flexible components that can fit into their respective connecting portions.

2. The battery device according to claim 1, characterized in that, The first connecting portion includes a first main body and a first protrusion. The first protrusion is disposed on the side of the first main body near the second connecting portion. The second connecting portion includes a second main body and a second protrusion. The second protrusion is disposed on the side of the second main body near the first connecting portion. The second protrusion and the first protrusion are stacked and connected in the thickness direction of the busbar component. In the same busbar component, one of the first main body and the second main body is made of the same material as and connected to the positive electrode output portion of one of the battery cells, and the other of the first main body and the second main body is made of the same material as and connected to the negative electrode output portion of another battery cell. The connecting surface between the first protrusion and the second protrusion is an inclined surface, and the inclined surface forms an angle with the thickness direction of the busbar component.

3. The battery device according to claim 1, characterized in that, The included angle is greater than or equal to 45° and less than 90°.

4. The battery device according to claim 2, characterized in that, In a first direction, the dimensions of both the first protrusion and the second protrusion are less than or equal to 1 / 3 of the dimensions of the busbar component, and the first direction is the arrangement direction of the first connecting portion and the second connecting portion.

5. The battery device according to claim 2, characterized in that, The thickness of the first main body and the second main body is the same.

6. The battery device according to claim 1, characterized in that, The first connecting portion and the second connecting portion are arranged side by side along a first direction, which is the width direction or the length direction of the confluence component.

7. The battery device according to claim 6, characterized in that, The first connecting portion has a first surface that connects to the positive output portion, and the second connecting portion has a second surface that connects to the negative output portion; In the first direction, the difference between the size of the first surface and the size of the second surface is less than or equal to 1 / 4 of the size of the first surface or the second surface.

8. The battery device according to claim 7, characterized in that, In the first direction, the first surface and the second surface have the same dimensions.

9. The battery device according to claim 7, characterized in that, The first surface and the second surface are located in the same plane.

10. The battery device according to claim 1, characterized in that, The battery device further includes a housing, and at least a portion of the individual battery cells are disposed within the housing; The battery cell includes a main body and an output portion connected to the main body. The main body has a first surface, which is the surface where the main body and the output portion are connected. The battery device also includes a separator plate, which is disposed inside the housing and is spaced apart from or in contact with the first surface. The busbar is fixed to the side of the separator plate away from the main body. The separator plate has a through structure for the output portion of the battery cell to pass through, and the output portion is electrically connected to the busbar.

11. The battery device according to claim 10, characterized in that, At least one of the first connecting part and the second connecting part is provided with a fixing structure between itself and the isolation plate, and the busbar component is connected to the isolation plate through the fixing structure.

12. The battery device according to claim 11, characterized in that, The fixing structure includes a first protrusion structure and a through hole structure that fit together. The through hole structure is provided in the first connecting part and / or the second connecting part, and the first protrusion structure is provided in the isolation plate.

13. The battery device according to claim 10, characterized in that, The isolation plate has a groove, and at least a portion of the busbar component is disposed within the groove.

14. The battery device according to claim 13, characterized in that, The groove and the through structure are spaced apart along a first direction, which is the arrangement direction of the first connecting part and the second connecting part.

15. The battery device according to any one of claims 1-14, characterized in that, The battery device further includes a sampling line, and one of the first connecting part and the second connecting part is provided with a third connecting part, which is electrically connected to the sampling line.

16. The battery device according to claim 15, characterized in that, The third connecting part is integrally formed with the first connecting part or the second connecting part.

17. An electrical appliance, characterized in that, Includes the battery device according to any one of claims 1-16.

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