Connection, battery device and electric device

Abstract

Embodiments of the present application provide a connecting piece, a battery device and a power utilization device, and belong to the technical field of batteries. The connecting piece comprises a first conductive piece and two second conductive pieces. The two second conductive pieces are connected through the first conductive piece. One of the two second conductive pieces is used for electrical connection with a circuit board of a sampling assembly, and the other is used for electrical connection with a battery monomer. The material of the first conductive piece is different from that of the second conductive piece. The yield strength of the first conductive piece is less than that of the second conductive piece. The first conductive piece and the second conductive piece are welded. The connecting piece of the structure can improve the reliability of the battery device.

Description

Technical Field

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

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

[0003] Improving the reliability of battery devices is a pressing issue in battery technology. Utility Model Content

[0004] This application provides a connector, a battery device, and an electrical device that can improve the reliability of the battery device.

[0005] In a first aspect, embodiments of this application provide a connector, including a first conductive element and two second conductive elements. The two second conductive elements are connected through the first conductive element. One of the two second conductive elements is used for electrical connection with the circuit board of a sampling component, and the other is used for electrical connection with a battery cell. The materials of the first conductive element and the second conductive elements are different, and the yield strength of the first conductive element is less than the yield strength of the second conductive element. The first conductive element and the second conductive element are welded together.

[0006] In the above technical solution, on the one hand, the yield strength of the first conductive component is lower than that of the second conductive component. When the battery cell expands to apply tension to the connector, the first conductive component can undergo plastic deformation, thereby reducing the risk of the connector breaking in the early stage of battery cell expansion. On the other hand, the yield strength of the second conductive component is higher than that of the first conductive component. In the connection and assembly process between the connector and the battery cell or sampling component circuit board, the risk of plastic deformation of the second conductive component can be reduced. When the battery cell expands to apply tension to the connector, the second conductive component is less prone to plastic deformation than the first conductive component, thereby improving the structural stability of the connection between the connector and the circuit board of the battery cell or sampling component, and improving the reliability of the battery device with this connector. At the same time, the first and second conductive components are connected by welding. On the one hand, this helps to reduce the resistance between the first and second conductive components, thereby improving the conductivity between them. On the other hand, it facilitates the prefabrication of the connector at the factory and makes it easier to replace and install the connector in the market.

[0007] In some embodiments, the first conductive element is a wire, the second conductive element is a conductive sheet, and the two ends of the first conductive element are respectively connected to two second conductive elements.

[0008] In the above technical solution, by setting the first conductive element as a wire and connecting both ends of the first conductive element to two second conductive elements respectively, the connector has a bendable and deformable part (i.e., the first conductive element) between the two second conductive elements. This allows the first conductive element to adapt to the increase in distance between the two second conductive elements caused by the expansion of the battery cell to a certain extent, thereby further reducing the risk of the connector breaking in the early stage of battery cell expansion. At the same time, by setting the second conductive element as a conductive sheet, it is beneficial to increase the connection area at the connection between the connector and the battery cell or circuit board, thereby improving the reliability of the connection between the connector and the battery cell or circuit board.

[0009] In some embodiments, the second conductive element has a first side and a second side disposed opposite to each other in its thickness direction, one end of the first conductive element is connected to the first side, and the second side is used for electrical connection with a battery cell or a circuit board.

[0010] In the above technical solution, the connection between the first conductive element and the second conductive element and the connection between the second conductive element and the battery cell or circuit board are respectively set on opposite sides of the second conductive element. This reduces the risk of the first conductive element protruding from the second side interfering with the electrical connection between the second side and the battery cell or circuit board compared to the case where the two connections are set on the same side, and further improves the reliability of the connection between the connector and the battery cell or circuit board.

[0011] In some embodiments, the area of ​​the first side is 30 mm². 2 -240mm 2 .

[0012] In the above technical solution, the area of ​​the first side is set to be greater than or equal to 30mm². 2 This helps to further increase the connection area at the connection between the connector and the battery cell or circuit board, thereby further improving the reliability of the connection between the connector and the battery cell or circuit board; by setting the area of ​​the first side to be less than or equal to 240mm² 2 This reduces the manufacturing cost of the connectors; therefore, the area of ​​the first side surface is 30mm². 2 -240mm 2 This approach can improve the reliability of the connection between the connector and the battery cell or circuit board while reducing the manufacturing cost of the connector.

[0013] In some embodiments, the dimension of the first side surface in the first direction is 3mm-8mm, the dimension of the first side surface in the second direction is 10mm-30mm, and the first direction, the second direction, and the thickness direction of the second conductive element are perpendicular to each other.

[0014] In the above technical solution, on the one hand, by setting the size of the first side in the first direction to be greater than or equal to 3mm, it is beneficial to further increase the connection area at the connection between the connector and the battery cell or circuit board, thereby further improving the reliability of the connection between the connector and the battery cell or circuit board; on the other hand, by setting the size of the first side in the first direction to be less than or equal to 8mm, the risk of interference between the second conductive element and other structures on the circuit board (such as the second conductive element of the connector adjacent in the first direction) is reduced. Therefore, when the size of the first side in the first direction is 3mm-8mm, it is possible to improve the reliability of the connection between the connector and the battery cell or circuit board while reducing the risk of interference between the second conductive element and other structures on the circuit board. On the other hand, by setting the dimension of the first side in the second direction to be greater than or equal to 10 mm, it is beneficial to further increase the connection area at the connection between the connector and the battery cell or circuit board, thereby further improving the reliability of the connection between the connector and the battery cell or circuit board. By setting the dimension of the first side in the second direction to be less than or equal to 30 mm, the risk of interference between the second conductive element and other structures on the circuit board (such as the second conductive element of the connector adjacent in the second direction) is reduced. Therefore, when the dimension of the first side in the second direction is 10 mm to 30 mm, the reliability of the connection between the connector and the battery cell or circuit board can be improved while the risk of interference between the second conductive element and other structures on the circuit board can be reduced.

[0015] In some embodiments, the thickness of the second conductive element is 0.1 mm to 0.3 mm.

[0016] In the above technical solution, by setting the thickness of the second conductive component to be greater than or equal to 0.1 mm, the structural strength of the second conductive component can be improved, thereby further reducing the risk of plastic deformation of the second conductive component in the connection and assembly process of the connector with the battery cell and the sampling component circuit board; by setting the thickness of the second conductive component to be less than or equal to 0.3 mm, it is beneficial to reduce the space occupied by the connector in its thickness direction, leaving more installation space for other components inside the battery device; therefore, when the thickness of the second conductive component is 0.1 mm to 0.3 mm, the risk of plastic deformation of the second conductive component can be further reduced, and more installation space can be left for other components inside the battery device.

[0017] In some embodiments, the cross-sectional area of ​​the first conductive element is 7500 μm. 2 -20000μm 2 The cross-section is perpendicular to the extension direction of the first conductive element.

[0018] In the above technical solution, the cross-sectional area of ​​the first conductive element is set to be greater than or equal to 7500 μm. 2This allows the first conductive element to have a larger current-carrying cross-sectional area, which helps to reduce the resistance of the first conductive element, reduces the risk of excessive temperature rise during operation, and also gives the first conductive element a certain mechanical strength, reducing the risk of breakage under vibration conditions and improving the reliability of the first conductive element; by setting the cross-sectional area of ​​the first conductive element to be less than or equal to 20000μm 2 This gives the first conductive element a certain degree of flexibility, allowing it to adapt to the increased distance between the two second conductive elements caused by the expansion of the battery cell, thus improving the reliability of the first conductive element; therefore, the cross-sectional area of ​​the first conductive element is 7500 μm. 2 -20000μm 2 This can improve the reliability of the first conductive component.

[0019] In some embodiments, the yield strength of the first conductive element is 30MPa-80MPa, and the yield strength of the second conductive element is 100MPa-250MPa.

[0020] In the above technical solution, on the one hand, by setting the yield strength of the first conductive component to be greater than or equal to 30MPa, the first conductive component has a certain structural strength, thereby reducing the risk of false alarms caused by the middle of the first conductive component overlapping the battery cell under vibration conditions; on the other hand, by setting the yield strength of the first conductive component to be less than or equal to 80MPa, when the battery cell expands to apply tension to the connector, the first conductive component can undergo plastic deformation, thereby reducing the risk of the connector breaking in the early stage of battery cell expansion; therefore, when the yield strength of the first conductive component is 30MPa-80MPa, the risk of false alarms of the battery device can be reduced, while the risk of the connector breaking in the early stage of battery cell expansion can also be reduced. On the other hand, by setting the yield strength of the second conductive element to be greater than or equal to 100 MPa, the second conductive element is less prone to plastic deformation relative to the first conductive element, thereby improving the structural stability of the connection between the connector and the circuit board of the battery cell or sampling assembly; by setting the yield strength of the second conductive element to be less than or equal to 250 MPa, the risk of brittle fracture of the second conductive element due to excessively hard material can be reduced; therefore, when the yield strength of the second conductive element is 100 MPa-250 MPa, the structural stability of the connection between the connector and the circuit board of the battery cell or sampling assembly can be improved.

[0021] In some embodiments, the elongation at break of the first conductive element is 5%-10%.

[0022] In the above technical solution, by setting the elongation at break of the first conductive component to be greater than or equal to 5%, the first conductive component has sufficient plastic deformation before fracture, reducing the risk of connector fracture in the early stage of battery cell expansion; by setting the elongation at break of the first conductive component to be less than or equal to 10%, the connector can fracture when the battery cell expansion is large to generate an early warning, improving the reliability of the battery device with the connector; therefore, when the elongation at break of the first conductive component is 5%-10%, the risk of connector fracture in the early stage of battery cell expansion can be reduced, and the reliability of the battery device with the connector can be improved.

[0023] In some embodiments, along the extension direction of the first conductive element, the first conductive element is configured to plastically deform when subjected to a tensile force greater than a first preset value, and is configured to break when subjected to a tensile force greater than a second preset value, wherein the first preset value is F1, the second preset value is F2, and 5N≤F1<F2≤10N.

[0024] In the above technical solution, setting F1 to greater than or equal to 5N can reduce the risk of plastic deformation of the first conductive component under vibration conditions; setting F1 to less than or equal to F2 allows the first conductive component to undergo plastic deformation when the battery cell expands to apply tension to the connector, and it will break after the battery cell expands to a certain extent; by setting F2 to less than or equal to 10N, the connector can break when the battery cell expands to a large extent to generate an early warning, thereby improving the reliability of the battery device equipped with the connector.

[0025] In some embodiments, the first conductive element is made of aluminum, tin, or lead, and the second conductive element is made of nickel, iron, or copper.

[0026] In the above technical solution, aluminum, tin or lead have low yield strength and good ductility, so the first conductive component made of aluminum, tin or lead has low yield strength and good ductility; nickel, iron or copper have high yield strength and good weldability, so the second conductive component made of nickel, iron or copper has high yield strength and good weldability, which is beneficial to connecting the second conductive component with the first conductive component by welding, and also beneficial to electrically connecting the second conductive component with the circuit board or battery cell by welding.

[0027] Secondly, embodiments of this application provide a battery device, including a battery cell, a sampling assembly, and the aforementioned connector. The sampling assembly includes a circuit board. One of two second conductive members is electrically connected to the circuit board of the sampling assembly, and the other is electrically connected to the battery cell.

[0028] In some embodiments, the first conductive element is a wire, and its two ends are respectively connected to two second conductive elements. The minimum distance between the connection points of the first conductive element and the two second conductive elements is D, and the length of the first conductive element in its extension direction is L, where L > D.

[0029] In the above technical solution, since L>D, the length of the first conductive element in its extension direction is greater than the straight-line distance between the two ends of the first conductive element. That is, the first conductive element is arranged in a bent or relaxed state. In this way, when the battery cell expands, the first conductive element can be gradually straightened to consume the deformation margin, and then it can withstand the tensile force to undergo plastic deformation, thereby further reducing the risk of the connector breaking in the early stage of battery cell expansion.

[0030] In some embodiments, 1.1 ≤ L / D ≤ ​​2.

[0031] In the above technical solution, by setting L / D to be greater than or equal to 1.1, it is possible to ensure that the first conductive component has sufficient deformation margin, thereby further reducing the risk of connector breakage in the early stage of battery cell expansion; by setting L / D to be less than or equal to 2, it is possible to reduce the risk of false alarms caused by the middle part of the first conductive component drooping and overlapping with the battery cell due to excessive L; therefore, when 1.1≤L / D≤2, it is possible to further reduce the risk of connector breakage in the early stage of battery cell expansion and reduce the risk of false alarms from the battery device.

[0032] In some embodiments, the sampling component is located on one side of the battery cell in a first direction. Along the first direction, the first conductive element is bent in a direction away from the second conductive element, and the maximum size of the first conductive element is 3mm-7mm.

[0033] In the above technical solution, the first conductive element arches and bends away from the second conductive element, forming an elastic buffer arc. When the expansion of the battery cell causes the distance between the two second conductive elements to increase, the bent first conductive element can be gradually flattened to absorb the displacement, thus playing an elastic buffering role. Simultaneously, setting the maximum size of the first conductive element to be greater than or equal to 3mm ensures that the first conductive element has sufficient deformation margin, further reducing the risk of connector breakage in the early stages of battery cell expansion. Setting the maximum bending size to be less than or equal to 7mm reduces the risk of interference between adjacent structural components (such as the battery housing). Therefore, when the maximum size of the first conductive element is 3mm-7mm, the risk of connector breakage in the early stages of battery cell expansion can be further reduced, as can the risk of interference between adjacent structural components.

[0034] In some embodiments, the second conductive element is a conductive sheet, and the second conductive element has a first side and a second side disposed opposite to each other in its thickness direction. The first conductive element is connected to the first side and the second side is electrically connected to a battery cell or a circuit board.

[0035] In the above technical solution, the connection between the first conductive element and the second conductive element, and the connection between the second conductive element and the battery cell or circuit board are respectively located on opposite sides of the second conductive element. This reduces the risk of the first conductive element protruding from the second side interfering with the electrical connection between the second side and the battery cell or circuit board compared to the case where the two connections are located on the same side, and further improves the reliability of the connection between the connector and the battery cell or circuit board.

[0036] Thirdly, embodiments of this application provide an electrical device, characterized in that it includes the aforementioned battery device, which is used to provide electrical energy. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments; Figure 2 Exploded views of battery devices provided in some embodiments of this application; Figure 3 Exploded views of battery cells and sampling components provided in some embodiments of this application; Figure 4 This is a schematic diagram of the structure of a battery cell and a sampling assembly provided in some embodiments of this application; Figure 5 This application provides a schematic diagram of the structure of a connector according to some embodiments; Figure 6 This is a schematic diagram of another connector structure provided in some embodiments of this application; Figure 7 for Figure 6 Sectional view of CC; Figure 8 for Figure 4 Sectional view of AA.

[0039] Icons: 1000 - Vehicle; 100 - Battery unit; 10 - Housing; 11 - First housing body; 12 - Second housing body; 20 - Battery cell; 21 - Busbar component; 30 - Sampling assembly; 31 - Circuit board; 32 - First connector; 40 - Connector; 41 - First conductive component; 42 - Second conductive component; 42A - Third side; 42B - First side; 42C - Second side; 200 - Controller; 300 - Motor; X - First direction; Y - Second direction; Z - Thickness direction. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0042] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0043] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0044] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0045] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0046] In this application, "multiple" means two or more (including two).

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

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

[0049] In related technologies, a battery cell generally includes a casing and an electrode assembly. The casing may include a housing and an end cap. The housing has an opening. After the electrode assembly is installed inside the housing, the opening of the housing can be closed by the end cap to form a sealed space inside the housing to accommodate the electrode assembly.

[0050] The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, placed between the positive and negative electrodes, reduces the risk of short circuits while allowing active ions to pass through.

[0051] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0052] In some implementations, the electrode assembly is a stacked structure.

[0053] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0054] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0055] The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing can be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0056] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells.

[0057] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0058] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0059] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0060] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0061] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0062] 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.

[0063] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0064] The following discussion will primarily focus on rectangular battery cells. It should be understood that the embodiments described below are also applicable in some respects to cylindrical battery cells, pouch cell cells, or blade cell cells.

[0065] The development of battery technology must consider multiple design factors simultaneously, such as energy density, cycle life, discharge capacity, and charge / discharge rate. Additionally, battery reliability must be considered. To improve the reliability of battery devices, voltage and temperature data need to be collected from each individual cell using sampling components. During the manufacturing and use of battery devices, electrical connections between the individual cells and the sampling components are established using bonding aluminum wires to collect the voltage and temperature signals of the individual cells.

[0066] The repair method after the bonding aluminum wire fails is as follows: remove the broken bonding aluminum wire, replace the bonding aluminum wire with a nickel sheet, connect one end of the nickel sheet to the battery cell, and connect the other end to the circuit board of the sampling component; however, the nickel sheet is a rigid connection and cannot adapt to the displacement changes caused by the expansion of the battery cell, resulting in unstable sampling signals and reduced reliability of the battery device.

[0067] Based on the above considerations, in order to improve the reliability of both unrepaired and repaired battery devices, embodiments of this application provide a connector, including a first conductive element and two second conductive elements. The two second conductive elements are connected through the first conductive element. One of the two second conductive elements is used for electrical connection to the circuit board of a sampling component, and the other is used for electrical connection to a single battery cell. The materials of the first and second conductive elements are different, and the yield strength of the first conductive element is lower than that of the second conductive element. The first and second conductive elements are welded together.

[0068] In this connector structure, on the one hand, the yield strength of the first conductive element is lower than that of the second conductive element. When the battery cell expands to exert tension on the connector, the first conductive element can undergo plastic deformation, reducing the risk of connector breakage in the early stage of battery cell expansion. On the other hand, the yield strength of the second conductive element is higher than that of the first conductive element. During the connection and assembly process between the connector and the battery cell or sampling component circuit board (such as factory assembly or field maintenance), the risk of plastic deformation of the second conductive element can be reduced. Furthermore, when the battery cell expands to exert tension on the connector, the second conductive element is less prone to plastic deformation than the first conductive element, thereby improving the structural stability of the connection between the connector and the battery cell or sampling component circuit board, and enhancing the reliability of the battery device with this connector. Simultaneously, the first and second conductive elements are connected by welding. On the one hand, this helps reduce the resistance between the first and second conductive elements, thereby improving their conductivity. On the other hand, it facilitates prefabrication of the connector at the factory and makes it easier to replace and install the connector in the market.

[0069] The battery cells disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system comprising the battery cells and battery devices disclosed in this application can be used to construct such an electrical device. This reduces the risk of connectors breaking during the early stages of battery cell expansion, thereby improving the lifespan and reliability of the battery cells.

[0070] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is 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.

[0071] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0072] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000; for example, the battery device 100 can serve as the operating power source or general power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0073] In some embodiments of this application, the battery device 100 can not only serve as the operating power or power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0074] Please refer to Figure 2 and Figure 3 , Figure 2 This is an exploded view of a battery device 100 provided in some embodiments of this application. Figure 3 This is an exploded view of a battery cell 20 and a sampling assembly 30 provided in some embodiments of this application. The battery device 100 includes a housing 10 and battery cells 20, which are housed within the housing 10.

[0075] The housing 10 provides assembly space for the battery cell 20, and can adopt various structures. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, which overlap each other, and together define an assembly space for accommodating the battery cell 20. The second housing body 12 may be a hollow structure open at one end, and the first housing body 11 may be a plate-like structure, with the first housing body 11 covering the open side of the second housing body 12 so that the first housing body 11 and the second housing body 12 together define the assembly space; alternatively, the first housing body 11 and the second housing body 12 may both be hollow structures open on one side, with the open side of the first housing body 11 covering the open side of the second housing body 12.

[0076] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder, a cuboid, or a cube. For example, in... Figure 2 In the middle, the shape of box 10 is a cuboid.

[0077] In the battery device 100, there can be one or more battery cells 20 disposed within the housing 10. When there are multiple battery cells 20 disposed within the housing 10, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, in parallel, or in a mixed configuration to form a battery module, and then multiple battery modules are connected in series, in parallel, or in a mixed configuration to form a whole, which is then housed within the housing 10.

[0078] In some embodiments, the battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar 21 for connecting multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20. The busbar 21 may also be called a busbar, a strip, or a busbar strip, and is generally a thin metal sheet that can be welded to the electrode terminals of the battery cells 20 to connect multiple battery cells 20 in series or in parallel.

[0079] Each battery cell 20 can be a secondary battery cell 20 or a primary battery cell 20; it can also be a lithium-sulfur battery cell 20, a sodium-ion battery cell 20, or a magnesium-ion battery cell 20, but is not limited to these. The battery cell 20 can be in the form of a cuboid, cylinder, prism, or other shapes. For example, in... Figure 3 In the middle, the battery cell 20 has a cuboid structure.

[0080] Please refer to Figure 3 In some embodiments, the sampling component 30 includes a circuit board 31 and a first connector 32. The first connector 32 is mounted on the circuit board 31 and has a sampling end and a connection end. The sampling end is connected to the busbar component 21 or the battery cell 20 via a connector 40, and the connection end is connected to the controller 200 via the first connector 32.

[0081] Circuit board 31 is a component used to acquire electrical data of the sampled part. Circuit board 31 can be used to acquire the voltage and / or temperature of the battery cell 20.

[0082] In some implementations, circuit board 31 includes sampling wires and an insulating layer, with the insulating layer covering the outside of the sampling wires. The sampling wires can be copper wires, aluminum wires, silver wires, or alloy wires, etc. The insulating layer is made of a material with insulating properties, such as plastic or rubber. Optionally, the insulating layer can be a PI film (Polyimide Film) or a PET film (Polyester Film).

[0083] "Insulation layer covering the outside of the sampling conductor" includes two options: complete insulation coverage and partial insulation coverage. The insulation layer provides insulation, isolating the sampling conductor from other components and reducing the risk of short circuits due to contact. Furthermore, covering the sampling conductor with insulation also protects it, reducing the risk of damage.

[0084] Please refer to Figure 4 , Figure 4 This is a schematic diagram illustrating the structure of a battery cell 20 and a sampling assembly 30 provided in some embodiments of this application. Embodiments of this application provide a connector 40, including a first conductive element 41 and two second conductive elements 42. The two second conductive elements 42 are connected through the first conductive element 41. One of the two second conductive elements 42 is used for electrical connection to the circuit board 31 of the sampling assembly 30, and the other is used for electrical connection to the battery cell 20. The materials of the first conductive element 41 and the second conductive elements 42 are different, and the yield strength of the first conductive element 41 is less than the yield strength of the second conductive element 42. The first conductive element 41 and the second conductive element 42 are welded together.

[0085] The first conductive element 41 is an intermediate conductive member in the connector 40 used to conduct current between the two second conductive elements 42; the second conductive element 42 is a terminal member in the connector 40 used to be soldered to the circuit board 31 of the battery cell 20 or the sampling assembly 30.

[0086] Understandably, the first conductive element 41 and the second conductive element 42 can be made of conductive metals (such as copper, iron, and aluminum).

[0087] It should be noted that yield strength is the stress value at which the material begins to undergo plastic deformation. The yield strength of the first conductive element 41 is less than that of the second conductive element 42. That is, when the battery cell 20 expands to apply tension to the connector 40, the first conductive element 41 is more prone to plastic deformation than the second conductive element 42, allowing the connector 40 to undergo plastic deformation, with the deformation occurring between the two second conductive elements 42. Furthermore, the connector 40 adopts an integrated structure where the first conductive element 41 and the two second conductive elements 42 are pre-connected, which can be prefabricated in the factory. The two second conductive elements 42 can be limited by tooling to limit the connector 40, thereby reducing the risk of deformation and breakage of the first conductive element 41 during transportation, thus facilitating the transport of the connector 40.

[0088] In this embodiment, on the one hand, the yield strength of the first conductive element 41 is lower than that of the second conductive element 42. When the battery cell 20 expands to apply tension to the connector 40, the first conductive element 41 can undergo plastic deformation, thereby reducing the risk of the connector 40 breaking in the early stage of the battery cell 20 expansion. On the other hand, the yield strength of the second conductive element 42 is higher than that of the first conductive element 41. In the connection and assembly process of the connector 40 with the battery cell 20 and the circuit board 31 of the sampling component 30, the risk of plastic deformation of the second conductive element 42 can be reduced. When the battery cell 20 expands to apply tension to the connector 40, the second conductive element 42 is less likely to undergo plastic deformation than the first conductive element 41. This improves the structural stability of the connection between the connector 40 and the circuit board 31 of the battery cell 20 or the sampling component 30, and improves the reliability of the battery device 100 with the connector 40.

[0089] Please refer to Figure 5 and Figure 6 , Figure 5 This is a schematic diagram of the structure of a connector 40 provided in some embodiments of this application. Figure 6 This is a schematic diagram of another connector 40 provided in some embodiments of this application. According to some embodiments of this application, the first conductive element 41 is a wire, the second conductive element 42 is a conductive sheet, and the two ends of the first conductive element 41 are respectively connected to the two second conductive elements 42.

[0090] The conductor is a linear conductive member with flexible and bendable properties in the connector 40. The conductive sheet is a sheet-like terminal member in the connector 40 that provides a connection surface. Exemplarily, the conductive sheet may be circular or polygonal.

[0091] In some embodiments, the first conductive element 41 is made of aluminum, and the second conductive element 42 is made of nickel. The first conductive element 41 and the second conductive element 42 are bonded together at the factory using ultrasonic welding. The second conductive element 42 is connected to the busbar 21 or the circuit board 31 by laser welding or pressure welding to facilitate on-site maintenance.

[0092] In this embodiment, by setting the first conductive element 41 as a wire and connecting both ends of the first conductive element 41 to two second conductive elements 42 respectively, the connector 40 has a bendable and deformable portion (i.e., the first conductive element 41) between the two second conductive elements 42. This allows the first conductive element 41 to adapt to the increase in distance between the two second conductive elements 42 caused by the expansion of the battery cell 20 to a certain extent, thereby further reducing the risk of connector 40 breaking in the early stage of battery cell 20 expansion. At the same time, by setting the second conductive element 42 as a conductive sheet, it is beneficial to increase the connection area at the connection between connector 40 and battery cell 20 or circuit board 31, thereby improving the reliability of the connection between connector 40 and battery cell 20 or circuit board 31. The first conductive element 41 and the second conductive element 42 are connected by welding. On the one hand, this helps to reduce the resistance between the first conductive element 41 and the second conductive element 42, thereby improving the conductivity between the first conductive element 41 and the second conductive element 42. On the other hand, it is beneficial to prefabricate connector 40 at the factory and facilitate the overall replacement and installation of connector 40 in the market.

[0093] In some embodiments, please refer to Figure 5 Two second conductive elements 42 are spaced apart along a first direction X. Each second conductive element 42 has a third side surface 42A facing the other second conductive element 42 in the first direction X. Both ends of the first conductive element 41 are electrically connected to the third side surfaces 42A of the two second conductive elements 42, respectively. The first direction X is perpendicular to the thickness direction Z of the second conductive elements 42. This helps to reduce the length of the first conductive element 41 and lower the cost of the connector 40.

[0094] Please refer to Figure 6 and Figure 7 , Figure 7 for Figure 6 A cross-sectional view of the C-axis. According to some embodiments of this application, the second conductive member 42 has a first side surface 42B and a second side surface 42C disposed opposite to each other in its thickness direction Z. One end of the first conductive member 41 is connected to the first side surface 42B, and the second side surface 42C is used for electrical connection with the battery cell 20 or the circuit board 31.

[0095] The first side surface 42B is the surface of the second conductive element 42 facing the first conductive element 41; the second side surface 42C is the surface of the second conductive element 42 facing away from the first conductive element 41. For example, the first side surface 42B and the second side surface 42C have equal areas and are arranged in parallel.

[0096] In this embodiment, the connection between the first conductive element 41 and the second conductive element 42 and the connection between the second conductive element 42 and the battery cell 20 or the circuit board 31 are respectively located on opposite sides of the second conductive element 42. This reduces the risk of the first conductive element 41 protruding from the second side 42C interfering with the electrical connection between the second side 42C and the battery cell 20 or the circuit board 31, and further improves the reliability of the connection between the connector 40 and the battery cell 20 or the circuit board 31.

[0097] According to some embodiments of this application, the area of ​​the first side 42B is 30 mm². 2 -240mm 2 .

[0098] For example, the area of ​​the first side 42B can be 30 mm². 2 40mm 2 50mm 2 60mm 2 70mm 2 80mm 2 90mm 2 100mm 2 110mm 2 120mm 2 130mm 2 140mm 2 150mm 2 160mm 2 170mm 2 180mm 2 190mm 2 200mm 2 210mm 2 220mm 2 Or 230mm 2 wait.

[0099] In this embodiment, the area of ​​the first side surface 42B is set to be greater than or equal to 30 mm². 2 This helps to further increase the connection area at the connection between the connector 40 and the battery cell 20 or the circuit board 31, thereby further improving the reliability of the connection between the connector 40 and the battery cell 20 or the circuit board 31; by setting the area of ​​the first side 42B to be less than or equal to 240mm² 2This reduces the manufacturing cost of the connector 40; therefore, the area of ​​the first side surface 42B is 30 mm². 2 -240mm 2 At the same time, it can improve the reliability of the connection between the connector 40 and the battery cell 20 or the circuit board 31, while reducing the manufacturing cost of the connector 40.

[0100] According to some embodiments of this application, the first side surface 42B has a dimension of 3mm-8mm in the first direction X, and a dimension of 10mm-30mm in the second direction Y. The first direction X, the second direction Y, and the thickness direction Z of the second conductive element 42 are perpendicular to each other.

[0101] For example, the dimension of the first side 42B in the first direction X is B, which can be 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm or 8mm, etc.

[0102] For example, the dimension of the first side 42B in the second direction Y is L1, and L1 can be 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm or 30mm, etc.

[0103] Understandably, the first direction X can be the arrangement direction of the two second conductive elements 42, and the first direction X can be the extension direction of the circuit board 31.

[0104] The dimension of the first side surface 42B in the first direction X refers to the distance between the two points of the first side surface 42B that are farthest apart in the first direction X; the dimension of the first side surface 42B in the second direction Y refers to the distance between the two points of the first side surface 42B that are farthest apart in the second direction Y. In some embodiments, on a projection plane perpendicular to the thickness direction Z, the orthographic projection of the second conductive element 42 is rectangular, and the width direction of the orthographic projection of the second conductive element 42 on the projection plane perpendicular to the thickness direction Z is the first direction X, and the length direction of the orthographic projection of the second conductive element 42 on the projection plane perpendicular to the thickness direction Z is the second direction Y.

[0105] In this embodiment, on the one hand, by setting the size of the first side surface 42B in the first direction X to be greater than or equal to 3mm, it is beneficial to further increase the connection area at the connection between the connector 40 and the battery cell 20 or the circuit board 31, thereby further improving the reliability of the connection between the connector 40 and the battery cell 20 or the circuit board 31; on the other hand, by setting the size of the first side surface 42B in the first direction X to be less than or equal to 8mm, the risk of interference between the second conductive element 42 and other structures on the circuit board 31 (such as the second conductive element 42 of the connector 40 adjacent in the first direction X) is reduced. Therefore, when the size of the first side surface 42B in the first direction X is 3mm-8mm, it is possible to improve the reliability of the connection between the connector 40 and the battery cell 20 or the circuit board 31 while reducing the risk of interference between the second conductive element 42 and other structures on the circuit board 31. On the other hand, by setting the size of the first side 42B in the second direction Y to be greater than or equal to 10mm, it is beneficial to further increase the connection area at the connection between the connector 40 and the battery cell 20 or the circuit board 31, thereby further improving the reliability of the connection between the connector 40 and the battery cell 20 or the circuit board 31. By setting the size of the first side 42B in the second direction Y to be less than or equal to 30mm, the risk of interference between the second conductive element 42 and other structures on the circuit board 31 (such as the second conductive element 42 of the connector 40 adjacent in the second direction Y) is reduced. Therefore, when the size of the first side 42B in the second direction Y is 10mm-30mm, the reliability of the connection between the connector 40 and the battery cell 20 or the circuit board 31 can be improved while the risk of interference between the second conductive element 42 and other structures on the circuit board 31 can be reduced.

[0106] According to some embodiments of this application, the thickness of the second conductive element 42 is 0.1mm-0.3mm.

[0107] For example, the thickness of the second conductive element 42 is D1, which can be 0.1mm, 0.12mm, 0.14mm, 0.16mm, 0.18mm, 0.2mm, 0.22mm, 0.24mm, 0.26mm, 0.28mm or 0.3mm, etc.

[0108] In this embodiment, by setting the thickness of the second conductive element 42 to be greater than or equal to 0.1 mm, the structural strength of the second conductive element 42 can be improved, thereby further reducing the risk of plastic deformation of the second conductive element 42 during the connection and assembly process of the connector 40 with the battery cell 20 and the circuit board 31 of the sampling component 30. By setting the thickness of the second conductive element 42 to be less than or equal to 0.3 mm, it is beneficial to reduce the space occupied by the connector 40 in its thickness direction Z, leaving more installation space for other components inside the battery device 100. Therefore, when the thickness of the second conductive element 42 is 0.1 mm to 0.3 mm, the risk of plastic deformation of the second conductive element 42 can be further reduced, and more installation space can be left for other components inside the battery device 100.

[0109] In some embodiments, the second conductive element 42 is connected to the bus component 21 or the circuit board 31 by welding. By setting the thickness of the second conductive element 42 to be less than or equal to 0.3 mm, the risk of the second conductive element 42 being melted through during the welding process can be reduced.

[0110] According to some embodiments of this application, the cross-sectional area of ​​the first conductive element 41 is 7500 μm. 2 -20000μm 2 The cross-section is perpendicular to the extension direction of the first conductive element 41.

[0111] For example, the cross-sectional area of ​​the first conductive element 41 can be 7500 μm. 2 8000μm 2 9000μm 2 10000μm 2 11000μm 2 12000μm 2 13000μm 2 14000μm 2 15000μm 2 16000μm 2 17000μm 2 18000μm 2 19000μm 2 Or 20000μm 2 wait.

[0112] Understandably, the cross-section of the first conductive element 41 can be circular or polygonal. In some embodiments, the cross-section of the first conductive element 41 is circular, and the diameter of the first conductive element 41 is 100μm-500μm.

[0113] In this embodiment, the cross-sectional area of ​​the first conductive element 41 is set to be greater than or equal to 7500 μm. 2This design allows the first conductive element 41 to have a larger current-carrying cross-sectional area, which helps to reduce the resistance of the first conductive element 41, reduces the risk of excessive temperature rise during operation, and also gives the first conductive element 41 a certain mechanical strength, reducing the risk of breakage under vibration conditions and improving the reliability of the first conductive element 41; by setting the cross-sectional area of ​​the first conductive element 41 to be less than or equal to 20000μm 2 This gives the first conductive element 41 a certain degree of flexibility, allowing it to adapt to the increased distance between the two second conductive elements 42 caused by the expansion of the battery cell 20, thus improving the reliability of the first conductive element 41; therefore, the cross-sectional area of ​​the first conductive element 41 is 7500 μm. 2 -20000μm 2 This can improve the reliability of the first conductive element 41.

[0114] According to some embodiments of this application, the yield strength of the first conductive element 41 is 30MPa-80MPa, and the yield strength of the second conductive element 42 is 100MPa-250MPa.

[0115] It should be noted that the above-mentioned yield strength test method is the test method mentioned in GB / T 228.1-2021 "Metallic materials, tensile testing - Part 1: Test method at room temperature".

[0116] For example, the yield strength of the first conductive element 41 can be 30MPa, 35MPa, 40MPa, 45MPa, 50MPa, 55MPa, 60MPa, 65MPa, 70MPa, 75MPa or 80MPa, etc.

[0117] For example, the yield strength of the second conductive element 42 can be 100MPa, 110MPa, 120MPa, 130MPa, 140MPa, 150MPa, 160MPa, 170MPa, 180MPa, 190MPa, 200MPa, 210MPa, 220MPa, 230MPa, 240MPa or 250MPa, etc.

[0118] In this embodiment, on the one hand, by setting the yield strength of the first conductive element 41 to be greater than or equal to 30 MPa, the first conductive element 41 has a certain structural strength, thereby reducing the risk of false alarms caused by the middle part of the first conductive element 41 overlapping with the battery cell 20 under vibration conditions; on the other hand, by setting the yield strength of the first conductive element 41 to be less than or equal to 80 MPa, when the battery cell 20 expands to apply tension to the connector 40, the first conductive element 41 can undergo plastic deformation, thereby reducing the risk of the connector 40 breaking in the early stage of the expansion of the battery cell 20; therefore, when the yield strength of the first conductive element 41 is 30 MPa-80 MPa, the risk of false alarms of the battery device 100 can be reduced, while the risk of the connector 40 breaking in the early stage of the expansion of the battery cell 20 can also be reduced. On the other hand, by setting the yield strength of the second conductive element 42 to be greater than or equal to 100 MPa, the second conductive element 42 is less prone to plastic deformation relative to the first conductive element 41, thereby improving the structural stability of the connection between the connector 40 and the circuit board 31 of the battery cell 20 or the sampling assembly 30; by setting the yield strength of the second conductive element 42 to be less than or equal to 250 MPa, the risk of the second conductive element 42 breaking due to excessively hard material can be reduced; therefore, when the yield strength of the second conductive element 42 is between 100 MPa and 250 MPa, the structural stability of the connection between the connector 40 and the circuit board 31 of the battery cell 20 or the sampling assembly 30 can be improved.

[0119] According to some embodiments of this application, the elongation at break of the first conductive element 41 is 5%-10%.

[0120] Elongation at break reflects the degree of plastic deformation a material can withstand before fracture; the greater the elongation at break, the greater the deformation before fracture. It should be noted that the above-mentioned method for testing elongation at break is the test method mentioned in GB / T 228.1-2021 "Metallic materials, tensile testing—Part 1: Test at room temperature".

[0121] For example, the elongation at break of the first conductive element 41 can be 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5% or 10%.

[0122] In this embodiment, by setting the elongation at break of the first conductive element 41 to be greater than or equal to 5%, the first conductive element 41 has sufficient plastic deformation before fracture, reducing the risk of the connector 40 breaking in the early stage of the expansion of the battery cell 20. By setting the elongation at break of the first conductive element 41 to be less than or equal to 10%, the connector 40 can break when the battery cell 20 expands significantly to generate an early warning, thereby improving the reliability of the battery device 100 equipped with the connector 40. Therefore, when the elongation at break of the first conductive element 41 is 5%-10%, the risk of the connector 40 breaking in the early stage of the expansion of the battery cell 20 can be reduced, and the reliability of the battery device 100 equipped with the connector 40 can be improved.

[0123] According to some embodiments of this application, along the extending direction of the first conductive element 41, the first conductive element 41 is configured to plastically deform when subjected to a tensile force greater than a first preset value, and is configured to break when subjected to a tensile force greater than a second preset value, wherein the first preset value is F1, the second preset value is F2, and 5N≤F1<F2≤10N.

[0124] For example, F1 and F2 can be 5N, 5.5N, 6N, 6.5N, 7N, 7.5N, 8N, 8.5N, 9N, 9.5N or 10N, etc.

[0125] In this embodiment, setting F1 to greater than or equal to 5N can reduce the risk of plastic deformation of the first conductive element 41 under vibration conditions; setting F1 to less than or equal to F2 allows the first conductive element 41 to undergo plastic deformation when the battery cell 20 expands to apply tension to the connector 40, and to break after the battery cell 20 expands to a certain extent; by setting F2 to less than or equal to 10N, the connector 40 can break when the battery cell 20 expands to a large extent to generate an early warning, thereby improving the reliability of the battery device 100 equipped with the connector 40.

[0126] According to some embodiments of this application, the material of the first conductive element 41 includes aluminum, tin or lead, and the material of the second conductive element 42 includes nickel, iron or copper.

[0127] For example, the material of the first conductive element 41 may include aluminum, tin, lead, or an alloy including one or more of aluminum, tin, and lead. The material of the second conductive element 42 may include nickel, iron, copper, or an alloy including one or more of nickel, iron, and copper.

[0128] In this embodiment, aluminum, tin, or lead have low yield strength and good ductility, so the first conductive element 41 made of aluminum, tin, or lead has low yield strength and good ductility; nickel, iron, or copper have high yield strength and good weldability, so the second conductive element 42 made of nickel, iron, or copper has high yield strength and good weldability, which is beneficial for connecting the second conductive element 42 to the first conductive element 41 by welding, and also beneficial for electrically connecting the second conductive element 42 to the circuit board 31 or the battery cell 20 by welding.

[0129] Please refer to Figure 3 , Figure 4 and Figure 8 , Figure 8 for Figure 4 A cross-sectional view of AA. This application provides a battery device 100, including a battery cell 20, a sampling assembly 30, and the aforementioned connector 40. The sampling assembly 30 includes a circuit board 31. One of two second conductive members 42 is electrically connected to the circuit board 31 of the sampling assembly 30, and the other is electrically connected to the battery cell 20.

[0130] For example, one of the two second conductive elements 42 is soldered to the sampling wire in the circuit board 31 of the sampling assembly 30, and the other is soldered to the busbar 21.

[0131] Please refer to Figure 8 According to some embodiments of this application, the first conductive element 41 is a wire, and the two ends of the first conductive element 41 are respectively connected to two second conductive elements 42. The minimum distance between the connection positions of the first conductive element 41 and the two second conductive elements 42 is D, and the length of the first conductive element 41 in its extension direction is L, where L > D.

[0132] In this embodiment, since L > D, the length of the first conductive element 41 in its extension direction is greater than the straight-line distance between the two ends of the first conductive element 41. That is, the first conductive element 41 is arranged in a bent or relaxed state. In this way, when the battery cell 20 expands, the first conductive element 41 can be gradually straightened to consume the deformation margin, and then it can withstand the tensile force to undergo plastic deformation, thereby further reducing the risk of the connector 40 breaking in the early stage of the expansion of the battery cell 20.

[0133] Please refer to Figure 8 According to some embodiments of this application, 1.1 ≤ L / D ≤ ​​2.

[0134] For example, L / D can be 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9 or 2, etc.

[0135] In this embodiment, by setting L / D to be greater than or equal to 1.1, the first conductive element 41 can be guaranteed to have sufficient deformation margin, further reducing the risk of the connector 40 breaking during the early expansion phase of the battery cell 20. By setting L / D to be less than or equal to 2, the risk of the middle part of the first conductive element 41 drooping and overlapping the battery cell 20 due to excessive L can be reduced, resulting in overcurrent abnormalities and false alarms. Therefore, when 1.1≤L / D≤2, the risk of the connector 40 breaking during the early expansion phase of the battery cell 20 can be further reduced, and the risk of false alarms from the battery device 100 can be reduced.

[0136] Please refer to Figure 8 According to some embodiments of this application, the sampling component 30 is located on one side of the battery cell 20 in the first direction X. Along the first direction X, the first conductive element 41 is bent in a direction away from the second conductive element 42, and the maximum size of the first conductive element 41 is 3mm-7mm.

[0137] The first conductive element 41 bends away from the second conductive element 42, that is, the first conductive element 41 bends away from the battery cell 20. "The maximum dimension of the first conductive element 41 along the first direction X" refers to the largest distance between the point of the first conductive element 41 furthest from the battery cell 20 in the first direction X and the two ends of the first conductive element 41 in the first direction X, that is, the maximum height of the first conductive element 41 when it is bent and arched.

[0138] For example, the maximum dimension of the first conductive element 41 in the first direction X is C1, and C1 can be 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm or 7mm, etc.

[0139] In this embodiment, the first conductive element 41 arches and bends away from the second conductive element 42, forming an elastic buffer arc. When the expansion of the battery cell 20 causes the distance between the two second conductive elements 42 to increase, the bent first conductive element 41 can be gradually flattened to absorb the displacement, thus playing an elastic buffering role. At the same time, setting the maximum size of the first conductive element 41 to be greater than or equal to 3mm ensures that the first conductive element 41 has sufficient deformation margin, further reducing the risk of the connector 40 breaking during the early stage of the battery cell 20 expansion; setting the maximum bending size to be less than or equal to 7mm reduces the risk of interference between adjacent structural components of the first conductive element 41 (such as the housing 10 of the battery device 100); therefore, when the maximum size of the first conductive element 41 is 3mm-7mm, the risk of the connector 40 breaking during the early stage of the battery cell 20 expansion can be further reduced, and the risk of interference between adjacent structural components of the first conductive element 41 can be reduced.

[0140] Please refer to Figure 8According to some embodiments of this application, the second conductive element 42 is a conductive sheet. The second conductive element 42 has a first side surface 42B and a second side surface 42C that are disposed opposite to each other in the thickness direction Z. The first conductive element 41 is connected to the first side surface 42B, and the second side surface 42C is electrically connected to the battery cell 20 or the circuit board 31.

[0141] In this embodiment, the connection between the first conductive element 41 and the second conductive element 42, and the connection between the second conductive element 42 and the battery cell 20 or the circuit board 31, are respectively located on opposite sides of the second conductive element 42. This reduces the risk of the first conductive element 41 protruding from the second side 42C interfering with the electrical connection between the second side 42C and the battery cell 20 or the circuit board 31, compared to the case where the two connections are located on the same side. This further improves the reliability of the connection between the connector 40 and the battery cell 20 or the circuit board 31.

[0142] This application provides an electrical device, characterized in that it includes the battery device 100 described above, which is used to provide electrical energy.

[0143] According to some embodiments of this application, please refer to Figures 3-7 This application provides a connector 40, including a first conductive element 41 and two second conductive elements 42 connected by the first conductive element 41. One of the two second conductive elements 42 is electrically connected to the circuit board 31 of the sampling assembly 30, and the other is electrically connected to the battery cell 20. The first conductive element 41 is made of aluminum, tin, or lead, and the second conductive elements 42 are made of nickel, iron, or copper. The yield strength of the first conductive element 41 is 30 MPa-80 MPa, and the yield strength of the second conductive element 42 is 100 MPa-250 MPa. The elongation at break of the first conductive element 41 is 5%-10%. Along the extension direction of the first conductive element 41, the first conductive element 41 is configured to plastically deform when subjected to a tensile force greater than a first preset value, and is configured to fracture when subjected to a tensile force greater than a second preset value, where the first preset value is F1, the second preset value is F2, and 5N ≤ F1 < F2 ≤ 10N. The first conductive element 41 is a wire, and the second conductive element 42 is a conductive sheet. Both ends of the first conductive element 41 are connected to the two second conductive elements 42 respectively. The second conductive element 42 has a first side surface 42B and a second side surface 42C arranged opposite each other in its thickness direction Z. One end of the first conductive element 41 is connected to the first side surface 42B, and the second side surface 42C is used for electrical connection with the battery cell 20 or the circuit board 31. The area of ​​the first side surface 42B is 30 mm². 2 -240mm 2The first side surface 42B has a dimension of 3mm-8mm in the first direction X, and a dimension of 10mm-30mm in the second direction Y. The first direction X, the second direction Y, and the thickness direction Z of the second conductive element 42 are all perpendicular to each other. The thickness of the second conductive element 42 is 0.1mm-0.3mm. The cross-sectional area of ​​the first conductive element 41 is 7500μm. 2 -20000μm 2 The cross-section is perpendicular to the extension direction of the first conductive element 41.

[0144] According to some embodiments of this application, please refer to Figure 4 and Figure 8 This application provides a battery device 100, including a battery cell 20, a sampling component 30, and the aforementioned connector 40. The sampling component 30 includes a circuit board 31. One of two second conductive members 42 is electrically connected to the circuit board 31 of the sampling component 30, and the other is electrically connected to the battery cell 20. In some embodiments, the first conductive member 41 is a wire, and its two ends are respectively connected to the two second conductive members 42. The minimum distance between the connection points of the first conductive member 41 and the two second conductive members 42 is D, and the length of the first conductive member 41 in its extension direction is L, where 1.1 ≤ L / D ≤ ​​2. The sampling component 30 is located on one side of the battery cell 20 in the first direction X. Along the first direction X, the first conductive member 41 is bent away from the second conductive member 42, and the maximum size of the first conductive member 41 is 3mm-7mm. The second conductive element 42 is a conductive sheet. The second conductive element 42 has a first side 42B and a second side 42C that are arranged opposite to each other in the thickness direction Z. The first conductive element 41 is connected to the first side 42B, and the second side 42C is electrically connected to the battery cell 20 or the circuit board 31.

[0145] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0146] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit this application. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A connector, characterized in that, include: First conductive element; Two second conductive elements are connected through the first conductive element. One of the two second conductive elements is used to be electrically connected to the circuit board of the sampling component, and the other is used to be electrically connected to the battery cell. The first conductive component is made of a different material than the second conductive component, the yield strength of the first conductive component is less than the yield strength of the second conductive component, and the first conductive component and the second conductive component are welded together.

2. The connector as described in claim 1, characterized in that, The first conductive element is a wire, and the second conductive element is a conductive sheet. The two ends of the first conductive element are respectively connected to the two second conductive elements.

3. The connector as described in claim 2, characterized in that, The second conductive element has a first side and a second side disposed opposite to each other in its thickness direction. One end of the first conductive element is connected to the first side, and the second side is used for electrical connection with the battery cell or the circuit board.

4. The connector as described in claim 3, characterized in that, The area of ​​the first side is 30mm². 2 -240mm 2 .

5. The connector as described in claim 3, characterized in that, The first side has a dimension of 3mm-8mm in the first direction and a dimension of 10mm-30mm in the second direction. The first direction, the second direction, and the thickness direction of the second conductive element are perpendicular to each other.

6. The connector as described in claim 3, characterized in that, The thickness of the second conductive element is 0.1mm-0.3mm.

7. The connector as described in claim 2, characterized in that, The cross-sectional area of ​​the first conductive element is 7500 μm. 2 -20000μm 2 The cross-section is perpendicular to the extending direction of the first conductive element.

8. The connector as described in any one of claims 1-7, characterized in that, The yield strength of the first conductive element is 30MPa-80MPa, and the yield strength of the second conductive element is 100MPa-250MPa.

9. The connector as described in any one of claims 1-7, characterized in that, The elongation at break of the first conductive element is 5%-10%.

10. The connector as claimed in any one of claims 1-7, characterized in that, Along the extension direction of the first conductive element, the first conductive element is configured to plastically deform when subjected to a tensile force greater than a first preset value, and is configured to break when subjected to a tensile force greater than a second preset value, wherein the first preset value is F1, the second preset value is F2, and 5N≤F1<F2≤10N.

11. The connector as claimed in any one of claims 1-7, characterized in that, The first conductive element is made of aluminum, tin, or lead, and the second conductive element is made of nickel, iron, or copper.

12. A battery device, characterized in that, include: Battery cell; Sampling components, including a circuit board; According to any one of claims 1-11, one of the two second conductive elements is electrically connected to the circuit board of the sampling assembly, and the other is electrically connected to the battery cell.

13. The battery device as claimed in claim 12, characterized in that, The first conductive element is a wire, and its two ends are respectively connected to two second conductive elements. The minimum distance between the connection points of the first conductive element and the two second conductive elements is D, and the length of the first conductive element in its extension direction is L, where L > D.

14. The battery device as claimed in claim 13, characterized in that, 1.1≤L / D≤2.

15. The battery device as claimed in claim 13, characterized in that, The sampling component is located on one side of the battery cell in a first direction. Along the first direction, the first conductive element is bent away from the second conductive element, and the maximum size of the first conductive element is 3mm-7mm.

16. The battery device as claimed in claim 12, characterized in that, The second conductive element is a conductive sheet. The second conductive element has a first side and a second side that are disposed opposite to each other in its thickness direction. The first conductive element is connected to the first side, and the second side is electrically connected to the battery cell or the circuit board.

17. An electrical device, characterized in that, Includes the battery device according to any one of claims 12-16.

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