Battery device and electric device

Abstract

The utility model relates to the technical field of batteries, and discloses a battery device and a power utilization device. The battery device comprises a relay and a battery module, the relay is electrically connected with the battery module, the relay comprises a shell, a connecting terminal and a conductive piece, the connecting terminal comprises a first flow guide part and a second flow guide part which are connected in a preset direction, and one part of the first flow guide part protrudes out of the shell and is used for being electrically connected with the battery module; the second flow guide part is made of copper, and the first flow guide part is made of aluminum; the conductive piece moves in the preset direction to be in contact with or separated from the second flow guide part; and the maximum cross sectional area of the first flow guide part is larger than that of the second flow guide part. According to the application, the use amount of copper materials of the connecting terminal can be reduced, the self weight is reduced, the cost of the relay and the battery device is reduced while the diversion function of the connecting terminal is realized, the lightweight design of the battery device is facilitated, and the energy density of the battery device is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery device and a power utilization device. BACKGROUND

[0002] New energy batteries are increasingly widely used in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also increasingly used in the field of energy storage and the like.

[0003] In new energy vehicles equipped with batteries, the batteries can be used to provide power in whole or in part. In the field of energy storage, the batteries can be installed in an energy storage box or directly installed at a user side. With the increasing demand for battery applications, the industry continues to improve the requirements for reducing costs and reducing weight. Therefore, how to realize the lightweight and low-cost of the battery device has become one of the current industry research topics. UTILITY MODEL CONTENT

[0004] To solve the above technical problems, the present application provides a battery device and a power utilization device.

[0005] The present application is implemented by the following technical solutions.

[0006] A first aspect of the embodiments of the present application provides a battery device. The relay is electrically connected with the battery module. The relay includes a housing, a connection terminal and a conductive piece. The housing defines an accommodation space. The conductive piece is received in the accommodation space. The housing is provided with a through hole. The connection terminal is arranged in the through hole along a preset direction. The connection terminal includes a first flow guide part and a second flow guide part connected along the preset direction. A part of the first flow guide part protrudes outside the housing and is used for electrically connecting the battery module. The second flow guide part is made of copper. The first flow guide part is made of aluminum. The conductive piece is configured to move in contact with or separate from the second flow guide part along the preset direction. The maximum cross-sectional area of the first flow guide part is greater than that of the second flow guide part.

[0007] In the technical solution of the embodiments of the present application, the connection terminal is a copper-aluminum composite terminal. The cost and density of aluminum material are lower than those of copper material. Compared with a pure copper terminal, the connection terminal reduces its own cost and weight while meeting the overcurrent requirement, which is conducive to the lightweight design of the battery device and indirectly improves the energy density of the battery device.

[0008] In some embodiments, the connection terminal includes a third flow guide part. The third flow guide part is arranged between the first flow guide part and the second flow guide part along the preset direction. The two ends of the third flow guide part are connected with the first flow guide part and the second flow guide part, respectively.

[0009] In the technical scheme of the embodiment of the present application, since the connecting terminal comprises the first flow guide part, the third flow guide part and the second flow guide part, the materials of the first flow guide part and the third flow guide part are aluminum, therefore, only the inner second flow guide part retains copper material as a contact area, the amount of copper material can be maximally reduced, the cost of the relay and the battery device is significantly reduced while realizing the flow guide function of the connecting terminal, the weight of the connecting terminal is further reduced, which is beneficial to the lightweight design of the battery device and indirectly improves the energy density of the battery device.

[0010] In some embodiments, the relay comprises an insulating cover arranged in the accommodating space, and another part of the first flow guide part is arranged in the shell and is welded with the insulating cover.

[0011] In the technical scheme of the embodiment of the present application, since the first flow guide part is welded with the insulating cover, the connecting terminal is fixed after welding connection, can withstand the stress caused by vibration and on-off impact, improves the stability of the relay, and the welding sealing can block dust and water vapor from entering the inside of the insulating cover, protects the conductive parts and the like, and prolongs the service life of the relay. In addition, the internally arranged insulating cover can form continuous insulation isolation for the terminal and the conductive part, and improve the insulation protection grade of the relay.

[0012] In some embodiments, along the preset direction, the ratio of the length of the third flow guide part to the length of the first flow guide part is in the range of 2.5 to 5, and / or the ratio of the length of the second flow guide part to the length of the third flow guide part is in the range of 0.05 to 0.5.

[0013] In the technical scheme of the embodiment of the present application, thus, the length ratio of the first flow guide part, the third flow guide part and the second flow guide part is in a reasonable range, further reducing the cost and weight. While maximizing the use of aluminum material to reduce cost and weight, the increase in resistance and heat accumulation caused by too long flow path is avoided, realizing the balance of lightweight, low cost and conductivity efficiency.

[0014] In some embodiments, along the preset direction, the length of the third flow guide part is in the range of 10mm-20mm, and / or the length of the second flow guide part is in the range of 1mm-5mm.

[0015] In the technical scheme of the embodiment of the present application, thus, the length of the third flow guide part and the second flow guide part is in a suitable range, which can reasonably allocate the amount of aluminum material and copper material, fully realize the lightweight and low cost targets, and can also adapt to the accommodating space inside the relay shell, provide sufficient stroke for the movement of the conductive part, facilitate assembly, and take into account the structural adaptability and performance optimization.

[0016] In some embodiments, the first flow guide part comprises a welding part, the welding part is welded to the insulating cover, and the welding part is arranged along the circumference of the first flow guide part.

[0017] In the technical scheme of the embodiments of the present application, since the welding part is arranged along the circumference of the first flow guide part, the welding area is increased, the welding connection strength of the connecting terminal and the insulating cover is higher, and the stress is more uniform. Furthermore, the circumferential welding forms a ring-shaped sealing structure, fully covers the fitting gap between the connecting terminal and the insulating cover, blocks dust, water vapor and the like from entering the inside of the insulating cover, and adapts to various use environments.

[0018] In some embodiments, the material of the welding part is copper or aluminum.

[0019] In the technical scheme of the embodiments of the present application, since the material of the welding part is copper or aluminum, the welding part can be welded to the insulating cover by a brazing method, and the adaptability to the filler metal is good, which is convenient for forming.

[0020] In some embodiments, the first flow guide part, the third flow guide part and the second flow guide part are cylindrical or circular truncated conical, and the axes of the first flow guide part, the third flow guide part and the second flow guide part are consistent.

[0021] In the technical scheme of the embodiments of the present application, thus, the shapes of the first flow guide part, the third flow guide part and the second flow guide part are convenient for processing and convenient for integrated forming. Furthermore, since the coaxiality is high, the current can be uniformly distributed when flowing through the entire terminal, and the resistance is reduced.

[0022] In some embodiments, in a direction perpendicular to the preset direction, the size of the first flow guide part is greater than the size of the third flow guide part, and the size of the third flow guide part is equal to the size of the second flow guide part.

[0023] In the technical scheme of the embodiments of the present application, since the size of the first flow guide part is greater than the size of the third flow guide part, the first flow guide part has a larger cross-sectional area and surface area as an external connecting terminal, which provides a larger connection area and higher connection strength for welding or other connection methods, reduces the skin effect and resistance when the current flows in. In addition, the cross-sectional sizes of the third flow guide part and the second flow guide part are the same, so that the current flow between different materials is more stable, and additional resistance and heating points caused by cross-sectional changes are avoided.

[0024] In some embodiments, the battery device comprises a busbar, the first flow guide part is connected to the battery module through the busbar, and the material of the busbar is the same as that of the first flow guide part.

[0025] In the technical scheme of the embodiment of the present application, since the current collector is made of aluminum material, the material cost of the current collector can be reduced while maintaining good electrical conductivity, the weight of the current collector is reduced, the overall cost and weight of the battery device are further reduced, and the energy density is improved; and the material of the current collector is the same as that of the first flow guide part, which are the same metal of aluminum material, have the same melting point, reduce the welding difficulty of the two, improve the strength and reliability of the welded connection, and further improve the electrical stability.

[0026] In some embodiments, along the preset direction, the size of the part of the first flow guide part protruding from the shell is 1mm-3mm, and the thickness of the current collector is 1mm-5mm.

[0027] In the technical scheme of the embodiment of the present application, since the size of the part of the first flow guide part protruding from the shell is in a suitable range, the size neither occupies too much external space nor provides sufficient contact depth for welding with the current collector, improves the firmness of the welded joint, and avoids false welding. In addition, since the thickness of the current collector is in a suitable range, the thickness and cross-sectional area of the current collector can be flexibly adjusted according to the power demand and space limitation of the battery device, and various overcurrent requirements can be adapted.

[0028] The second aspect of the embodiment of the present application provides a power consumption device, which comprises the battery device of the first aspect of the embodiment of the present application, and the battery device is used for storing or providing electric energy.

[0029] The beneficial effects of the embodiment of the present application include that the amount of copper material of the connecting terminal can be reduced, the weight of the connecting terminal is reduced, the cost of the relay and the battery device is reduced while realizing the flow guiding function of the connecting terminal, which is conducive to the lightweight design of the battery device and improves the energy density of the battery device.

[0030] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, which can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0031] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are intended to only illustrate preferred embodiments and are not considered limiting of the present application. Moreover, like reference numerals denote like parts throughout the several views in the drawings. In the drawings:

[0032] Figure 1 The structural schematic diagram of a vehicle is provided for some embodiments of the present application;

[0033] Figure 2A perspective exploded schematic view of a battery device provided for some embodiments of the present application;

[0034] Figure 3 A perspective exploded schematic view of a battery device provided for some embodiments of the present application;

[0035] Figure 4 An assembly schematic view of a busbar and a relay provided for some embodiments of the present application;

[0036] Figure 5 A cross-sectional view of a busbar and a relay provided for some embodiments of the present application;

[0037] Figure 6 A cross-sectional view of a relay provided for some embodiments of the present application;

[0038] Figure 7 A structural schematic view of a connection terminal provided for some embodiments of the present application;

[0039] Figure 8 A front view of a connection terminal provided for some embodiments of the present application.

[0040] BRIEF DESCRIPTION OF DRAWINGS

[0041] 1000, vehicle; 100, battery device; 200, controller; 300, motor; 101, box body; 102, cover body; 103, bottom plate; 10, relay; 20, busbar; 30, battery module; 11, connection terminal; 12, housing; 13, insulating cover; 14, conductive member; 14A, movable contact; 1, first flow guide portion; 2, third flow guide portion; 3, second flow guide portion; 3A, stationary contact; 4, welding portion. DETAILED DESCRIPTION

[0042] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0043] 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 the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the present document and the above description of drawings are intended to cover non-exclusive inclusion.

[0044] In the description of the embodiments of the present application, the technical terms "first", "second", "third" and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0045] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The occurrence of the phrase in various places in the specification is not necessarily all referring to the same embodiment, nor is it necessarily referring to a separate or alternative embodiment to the other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0046] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0047] In the description of the embodiments of the present application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed in a particular orientation, be operated or used, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0048] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0049] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical term "contact" should be understood in a broad sense, which can be direct contact or contact through an intermediate medium layer, which can be contact between two objects in contact without interaction force, or contact between two objects in contact with interaction force.

[0050] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "parallel" and "perpendicular" allow a certain degree of tolerance and / or error, including approximately parallel, approximately perpendicular.

[0051] Hereinafter, the present application will be described in detail.

[0052] At present, new energy batteries are more and more widely used in life and industry. New energy batteries are not only used in energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also increasing.

[0053] In new energy vehicles equipped with batteries, the battery can be used to provide power in whole or in part. In the energy storage field, the battery can be installed in the energy storage box or directly installed on the user side. With the increasing demand for battery applications, the industry continues to improve the requirements for reducing costs and reducing weight. Therefore, how to realize the lightweight and low-cost of the battery device has become one of the current industry research topics.

[0054] After research and design, the relay connection terminal of the battery device is improved, and the material of part of the structure in the connection terminal is replaced from copper to aluminum. The density of aluminum material is lower, which significantly reduces the weight of the terminal, which is beneficial to the lightweight design of the battery device. And the copper material is reserved at the contact position of the connection terminal and the internal conductive part, which improves the conductivity and mechanical strength of the key parts, and meets the requirements of high conductivity and high reliability.

[0055] Based on such design concept, the present application designs a battery device, the relay is electrically connected with the battery module, the relay includes a shell, a connection terminal and a conductive part, the shell defines an accommodation space, the conductive part is received in the accommodation space, the shell is provided with a through hole, and the connection terminal is arranged in the through hole along a preset direction; the connection terminal includes a first flow guide part and a second flow guide part connected along the preset direction, a part of the first flow guide part protrudes outside the shell and is used for electrically connecting the battery module, the material of the second flow guide part is copper, and the material of the first flow guide part is aluminum; the conductive part is configured to move in contact with or separate from the second flow guide part along the preset direction; and the maximum cross-sectional area of the first flow guide part is greater than that of the second flow guide part.

[0056] Therefore, the connection terminal is a copper-aluminum composite terminal, and the cost and density of aluminum material are lower than those of copper material. Compared with the pure copper terminal, the connection terminal reduces its own cost and weight while meeting the overcurrent requirement, which is beneficial to the lightweight design of the battery device and indirectly improves the energy density of the battery device.

[0057] In the following embodiments, for the convenience of illustration, the power utilization device in an embodiment of the present application is taken as a vehicle 1000 for illustration. The following is described in conjunction with the drawings.

[0058] Figure 1 A structural schematic diagram of the vehicle 1000 is provided for some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, which can be a pure electric automobile, a hybrid automobile, or a range extended automobile, etc. As shown in the figure, Figure 1 The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, head, or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, the controller 200 being used to control the battery device 100 to supply power to the motor 300, for example, for the working power demand of the vehicle 1000 during starting, navigation, and driving.

[0059] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0060] Figure 2 A perspective exploded schematic diagram of the battery device 100 is provided for an embodiment of the present application. As shown in the figure, Figure 2 The battery device 100 includes a bottom plate 103, a cover 102, and a battery module 30, the cover 102 being arranged above the bottom plate 103, thereby forming a space for accommodating the battery module 30.

[0061] In an embodiment of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging of the battery cell.

[0062] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc., which are not limited in the present application.

[0063] Although not shown, the battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are embedded and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short circuiting, and at the same time allow the active ions to pass through.

[0064] In some embodiments, the electrode assembly is provided with a tab (not shown) that can conduct current out of the electrode assembly. The tab includes a positive tab and a negative tab.

[0065] In some embodiments, the electrode assembly can be in a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0066] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film, etc.

[0067] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes, including a square battery cell, a blade battery cell, a multi-prismatic battery cell (e.g., a hexagonal battery cell), etc., without particular limitation.

[0068] A battery apparatus according to embodiments of the present disclosure can include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a hybrid connection through a busbar component.

[0069] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0070] In some embodiments, the battery apparatus can be a battery pack including a case and one or more battery cell assemblies housed in the case.

[0071] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the case by fixing the battery module in the case.

[0072] As an example, the battery cell assembly can also be housed in the case by directly fixing a plurality of battery cells in the case.

[0073] As an example, the box can include a first box and a second box. The first box and the second box are buckled so that the inside of the box forms a closed space to accommodate the battery monomer assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0074] As an example, the box can include a top cover, a frame and a bottom plate. The top cover and the bottom plate are connected with the frame respectively, so that the inside of the box forms a closed space to accommodate the battery monomer assembly.

[0075] As an example, the box can be part of the chassis structure of the vehicle. For example, the top cover of the box can be at least part of the floor of the vehicle, or the frame of the box can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0076] In some embodiments, the battery device refers to an energy storage device, and the energy storage device includes a box, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet and the like.

[0077] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery monomers and battery devices, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, such as spacecraft including airplanes, rockets, space shuttles and spaceships.

[0078] In the following, the technical solutions of the present application are described in detail with reference to the accompanying drawings. Figures 1 to 8 The embodiments of the present application are described in detail.

[0079] Figure 1 The structural schematic diagram of the vehicle is provided for some embodiments of the present application; Figure 2 The perspective exploded schematic diagram of the battery device is provided for some embodiments of the present application; Figure 3 The perspective exploded schematic diagram of the battery device is provided for some embodiments of the present application; Figure 4 The assembly schematic diagram of the busbar and the relay is provided for some embodiments of the present application; Figure 5 The cross-sectional view of the busbar and the relay is provided for some embodiments of the present application; Figure 6 The cross-sectional view of the relay is provided for some embodiments of the present application; Figure 7 The structural schematic diagram of the connection terminal is provided for some embodiments of the present application; Figure 8 The front view of the connection terminal is provided for some embodiments of the present application. Among them Figure 3 The battery module is omitted, Figure 5 The internal part structure of the relay is omitted.

[0080] In some embodiments of this application, for ease of explanation, a preset direction is set, as shown by the arrows in Figures 6 to 8, with the direction of arrow Z being the preset direction. Sometimes, this third direction is also referred to as "above" or "below".

[0081] A first aspect of this application provides a battery device 100, in which a relay 10 is electrically connected to a battery module 30. The relay 10 includes a housing 12, a connecting terminal 11, and a conductive element 14. The housing 12 defines an accommodating space, and the conductive element 14 is housed in the accommodating space. The housing 12 has a through hole, and the connecting terminal 11 passes through the through hole along a preset direction (Z). The connecting terminal 11 includes a first guide portion 1 and a second guide portion 3 connected along the preset direction (Z). A portion of the first guide portion 1 protrudes from the outside of the housing 12 and is used for electrically connecting to the battery module 30. The second guide portion 3 is made of copper, and the first guide portion 1 is made of aluminum. The conductive element 14 is configured to move along the preset direction (Z) to contact or separate from the second guide portion 3. The maximum cross-sectional area of ​​the first guide portion 1 is greater than the maximum cross-sectional area of ​​the second guide portion 3.

[0082] It is understood that the battery device 100 includes a control component for controlling the on / off state of the battery device 100 circuit, voltage / current monitoring, fault protection, etc. The control component may include a relay 10, a fuse, a current sensor, a pre-charge resistor, etc., and the above components may be integrated into a high-voltage distribution box (not shown in the figure).

[0083] It is understood that relay 10 is a switch that controls the on / off state of a circuit by electromagnetically driving its internal contacts to connect or disconnect. In this embodiment, relay 10 refers to a DC relay 10 used in the high-voltage main circuit of battery device 100.

[0084] For example, the relay 10 can be a main positive relay 10, connected in series between the positive terminal of the battery pack and the load. The main positive relay 10 connects the positive terminal of the battery module 30 to the external load / charger and controls the on / off state of the positive circuit.

[0085] As another example, relay 10 can be a main negative relay 10, which connects the negative terminal of battery module 30 to an external load / charger to control the on / off state of the negative circuit.

[0086] As another example, relay 10 can be a pre-charged relay 10, which is used in series with a pre-charged resistor to prevent a large current from impacting the contacts of relay 10 at the moment of power-on, thus protecting the circuit.

[0087] For example, such as Figure 3 As shown, multiple relays 10 can be used in series.

[0088] Optionally, the relay 10 can also be a fast charging relay 10, a slow charging relay 10, etc., and the present application does not limit the same.

[0089] Optionally, the relay 10 has normally open contacts (open when power off, closed when power on) or normally closed contacts (closed when power off, open when power on), which can accurately control the connection / disconnection of the battery module 30 and the external circuit.

[0090] It can be understood that the shell 12 is an external protective structure of the relay 10, which is used to accommodate the conductive part 14, the insulating cover 13 and the like, and provides insulation and sealing protection.

[0091] Optionally, the shell 12 can be integral or composed of multiple parts, for example, the shell 12 includes an upper shell and a lower shell, which can be detachably connected by connecting bolts, buckles or the like, so that the subsequent maintenance of the relay 10 is convenient.

[0092] Optionally, the shell 12 can be made of engineering plastic or aluminum alloy. The shape of the shell 12 is not limited in the present application.

[0093] Exemplarily, as shown in Figure 5 , Figure 6 , the shell 12 is provided with two through holes, and the two connecting terminals 11 pass through the through holes.

[0094] Optionally, in some embodiments not shown, along the direction perpendicular to the preset direction (Z), an insulating partition plate, an insulating partition block or the like can be arranged between the two connecting terminals 11 to increase the creepage distance.

[0095] Exemplarily, the insulating partition plate can be fixed or integrally formed with the shell 12, and both are made of engineering plastic.

[0096] It should be noted that the connecting terminal 11 is in contact with the conductive part 14 to connect the circuit.

[0097] It can be understood that the connecting terminal 11 serves as a static contact and has a static contact point 3A. The conductive part 14 serves as a moving contact and has a moving contact point 14A. The conductive part 14 can move to drive the moving contact point 14A to contact the static contact point 3A of the connecting terminal 11 and connect the circuit.

[0098] Exemplarily, as shown in Figure 6 , the conductive part 14 is accommodated in the accommodating space of the shell 12. The material of the conductive part 14 is a material with conductivity (such as copper or the like).

[0099] Exemplarily, as shown in Figure 6As shown, the side of the conductive member 14 close to the connecting terminal 11 is plate-shaped, for example, the conductive member 14 includes a plate-shaped movable contact. The relay 10 has two connecting terminals 11, and the conductive member 14 has two movable contacts 14A corresponding to the fixed contacts 3A, both of which are two in number.

[0100] It can be understood that the fixed contact 3A is located at the bottom of the connecting terminal 11, that is, on the side provided in the shell 12, and can be in contact with the conductive member 14. The movable contact 14A of the conductive member 14 cooperates with the fixed contact 3A of the two connecting terminals 11 respectively. When the movable contacts 14A at both ends of the conductive member 14 are in contact with the fixed contacts 3A at the bottom of the two connecting terminals 11, the current flows in from one of the connecting terminals 11, and then flows out from the other connecting terminal 11 through the conductive member 14.

[0101] Optionally, the fixed contact 3A and the movable contact 14A can protrude from the surface of the respective terminal, or can not protrude. In this embodiment, the contact is taken as an example for illustration.

[0102] It can be understood that in this embodiment, the fixed contact 3A is a normally open contact and is not in contact with the movable contact 14A in the normal state.

[0103] It should be noted that in this embodiment, the shell 12 further has a coil, a spring, an armature and the like. The coil generates a magnetic field after being energized, the armature drives the conductive member 14 to move, so that the movable contact 14A is in contact with the fixed contact 3A to be closed. After the coil is de-energized, the magnetic field disappears, and the spring drives the conductive member 14 to reset.

[0104] Optionally, the shell 12 further has a yoke and a permanent magnet, which are used to realize magnetic blowout arc.

[0105] It can be understood that in this embodiment, the connecting terminal 11 is made of a conductive material and has conductivity.

[0106] It can be understood that the connecting terminal 11 includes the first flow guide part 1 and the third flow guide part 2, which can be directly connected or indirectly connected.

[0107] Exemplarily, the first flow guide part 1 and the third flow guide part 2 are indirectly connected by a conductive material.

[0108] It can be understood that in this embodiment, the cross section refers to a plan view formed by the intersection of the cutting plane and the flow guide part after the flow guide part is cut perpendicular to the axis of the flow guide part (the axis is the preset direction). The cross-sectional area refers to the area of the cross section.

[0109] It can be understood that if the flow guide part is in a cylindrical shape, the maximum cross-sectional area refers to the area of the bottom surface of the cylinder.

[0110] It can be understood that the first flow guide part 1 protrudes from the outside of the shell 12, and the first flow guide part 1 is electrically connected to the outside. Therefore, the required flow cross section is larger.

[0111] Exemplarily, the first flow guide part 1 is connected to the busbar 20, and the second flow guide part 3 can be electrically connected to the conductive part 14. The maximum cross-sectional area of the first flow guide part 1 is greater than that of the second flow guide part 3.

[0112] Optionally, the first flow guide part 1 and the second flow guide part 3 have similar cross-sectional shapes.

[0113] Exemplarily, the cross-sectional shapes of the first flow guide part 1 and the second flow guide part 3 are both circular. The diameter of the cross section of the first flow guide part 1 is greater than that of the second flow guide part 3.

[0114] In the technical scheme of the embodiment of the present application, the connection terminal 11 is a copper-aluminum composite terminal. The cost and density of aluminum material are lower than those of copper material. Compared with a pure copper terminal, the connection terminal 11 reduces the cost and weight of itself while meeting the overcurrent requirement, which is conducive to the lightweight design of the battery device 100 and indirectly improves the energy density of the battery device 100.

[0115] In the embodiment of the present application, the connection terminal 11 includes a third flow guide part 2. The third flow guide part 2 is arranged between the first flow guide part 1 and the second flow guide part 3 along a preset direction (Z). The two ends of the third flow guide part 2 are connected to the first flow guide part 1 and the second flow guide part 3, respectively.

[0116] It can be understood that the first flow guide part 1, the third flow guide part 2, and the second flow guide part 3 are connected in sequence. The first flow guide part 1 contacts the third flow guide part 2, and the third flow guide part 2 contacts the second flow guide part 3. The current can flow from the first flow guide part 1 to the second flow guide part 3 through the third flow guide part 2, and vice versa.

[0117] Exemplarily, the first flow guide part 1 and the third flow guide part 2 are in surface contact, and the third flow guide part 2 and the second flow guide part 3 are also in surface contact, thereby increasing the flow area.

[0118] Optionally, the contact area between the first flow guide part 1 and the third flow guide part 2 is a first area, and the contact area between the second flow guide part 3 and the third flow guide part 2 is a second area. The first area can be greater than or equal to the second area.

[0119] It can be understood that the first flow guide part 1 at least partially protrudes from the outside of the shell 12 and can be electrically connected to the battery module 30 outside the relay 10. The second flow guide part 3 is located at the bottom of the connection terminal 11 and has a stationary contact 3A, which can contact a movable contact 14A of the conductive part 14.

[0120] Optionally, the first flow guide part 1, the third flow guide part 2 and the second flow guide part 3 can be any one of a cylinder, a prism, a circular truncated cone and a prismatic truncated cone.

[0121] Optionally, the first flow guide part 1, the third flow guide part 2 and the second flow guide part 3 can be a cylinder or a prism.

[0122] Optionally, the first flow guide part 1, the third flow guide part 2 and the second flow guide part 3 can have the same size along the preset direction (Z), or different sizes, or the sizes of any two of them are the same.

[0123] Optionally, the material of the second flow guide part 3 can be oxygen-free copper (red copper), brass, phosphorus deoxidized copper, such as copper alloy TU1, TU2, H68, etc.

[0124] Optionally, the material of the first flow guide part 1 and the third flow guide part 2 can be aluminum alloy, such as 1-series aluminum, for example, 1050, 1060, 1070, 1350, etc., or 6-series aluminum, for example, 6101, etc.

[0125] Optionally, the first flow guide part 1, the third flow guide part 2 and the second flow guide part 3 can be provided with a plating layer on the flow surface, such as gold plating, silver plating, etc. The embodiments of the present application do not limit this.

[0126] Optionally, the first flow guide part 1 and the third flow guide part 2 can be connected by one-piece stamping forming, welding forming, etc.

[0127] Optionally, the first flow guide part 1 and the third flow guide part 2 can be connected by stamping forming.

[0128] Optionally, the third flow guide part 2 and the second flow guide part 3 can be connected by ultrasonic welding, electromagnetic pulse welding, etc.

[0129] It can be understood that the first flow guide part 1, the third flow guide part 2 and the second flow guide part 3 are connected in a state of opposing flow surfaces.

[0130] It can be understood that the battery module 30 can include a plurality of battery monomers or battery monomer assemblies, battery modules, etc. The battery monomers, the battery monomer assemblies and the battery modules can be connected in series and in parallel to form the battery module 30. The battery module 30 can have a positive electrode lead-out end and a negative electrode lead-out end, which can be connected to the relay 10 through the busbar 20.

[0131] It can be understood that the battery device 100 includes a box body 101, which can include a cover body 102 and a bottom plate 103, which are connected to form an internal space for accommodating the battery module 30, the relay 10 and other components.

[0132] Optionally, the bottom plate 103 can be formed as a substantially flat plate, or as a tray shape with a side wall and a bottom wall. Figure 2 The present embodiment is not particularly limited in this regard.

[0133] Exemplarily, as shown in Figure 3 The bottom plate 103 can also include a frame, which is made of a material with sufficient strength, rigidity and corrosion resistance, and plays a supporting and protective role in the battery device while minimizing weight to improve energy efficiency. Commonly used materials include aluminum alloy, high-strength steel or composite materials, etc.

[0134] In the technical solution of the present embodiment, since the connecting terminal 11 includes the first flow guide part 1, the third flow guide part 2 and the second flow guide part 3, the materials of the first flow guide part 1 and the third flow guide part 2 are aluminum, therefore, only the contact area of the inner second flow guide part 3 retains copper material, which can maximize the reduction of copper material usage, while realizing the flow guide function of the connecting terminal 11, significantly reducing the cost of the relay 10 and the battery device 100. Moreover, the density of aluminum is lower than that of copper, and the copper-aluminum composite connecting terminal 11 can greatly reduce its own weight, which is conducive to the lightweight design of the battery device 100, and indirectly improves the energy density of the battery device 100.

[0135] In the embodiment of the present application, the relay 10 includes an insulating cover 13, which is arranged in the accommodation space, and another part of the first flow guide part 1 is arranged in the housing 12 and is welded with the insulating cover 13.

[0136] It should be noted that the relay 10 generally includes a low-voltage driving end and a high-voltage load end, the low-voltage driving end mainly includes the above-mentioned coil and low-voltage connector, which is used to drive the relay 10 to act. Specifically, the coil is the control part of the relay 10, which controls the on-off of the relay 10 by applying a low-voltage current, and the low-voltage connector is used to connect the low-voltage power supply to the coil to trigger the operation of the relay 10. The high-voltage load end can adopt the structure of the insulating cover 13, specifically, the insulating cover 13 is made of ceramic material, which is used to separate the internal components of the high-voltage load end from other components to prevent arc and gas leakage in the high-voltage circuit.

[0137] It can be understood that the connecting terminal 11 and the conductive part 14 are partially located in the insulating cover 13, and the bottom of the insulating cover 13 is open and covers the housing 12.

[0138] Exemplarily, as shown in Figure 7 , Figure 8 The welding part 4 is arranged on the inner side of the first flow guide part 1, protrudes along a predetermined direction (Z), and is welded with the top of the outer side of the insulating cover 13.

[0139] Optionally, the material of the welding part 4 can be metal, which is connected and fixed with the ceramic insulating cover 13 by brazing.

[0140] Exemplarily, the material of the welding portion 4 can be copper material, which is the same as the material of the second flow guide portion 3.

[0141] The embodiment of the present application does not limit the cross-sectional shape of the welding portion 4, and the welding portion 4 can be fixed with the first flow guide portion 1 and the insulating cover 13.

[0142] Exemplarily, the size of the welding portion 4 along the preset direction (Z) is 2 mm.

[0143] In the technical scheme of the embodiment of the present application, since the first flow guide portion 1 and the insulating cover 13 are welded, the connection terminal 11 is fixed after welding connection, can bear the stress caused by vibration and on-off impact, improves the stability of the relay 10, and the welding sealing can block dust and water vapor from entering the inside of the insulating cover 13, protects the conductive part 14 and other components, and prolongs the service life of the relay 10. In addition, the insulating cover 13 arranged inside can form continuous insulation isolation for the terminal and the conductive part 14, and improve the insulation protection grade of the relay 10.

[0144] In the embodiment of the present application, the ratio of the length of the third flow guide portion 2 to the length of the first flow guide portion 1 along the preset direction (Z) is in the range of 2.5 to 5, and / or the ratio of the length of the second flow guide portion 3 to the length of the third flow guide portion 2 is in the range of 0.05 to 0.5.

[0145] Alternatively, the ratio of the length of the third flow guide portion 2 to the length of the first flow guide portion 1 can be any one of the following values, or a value between any two of the values: 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5.0.

[0146] Alternatively, the ratio of the length of the second flow guide portion 3 to the length of the third flow guide portion 2 can be any one of the following values, or a value between any two of the values: 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5.

[0147] In the technical scheme of the embodiment of the present application, thus, the length ratio of the first flow guide portion 1, the third flow guide portion 2 and the second flow guide portion 3 is in a reasonable range, further reducing the cost and weight. While maximizing the use of aluminum material to reduce cost and weight, the increase in resistance and the accumulation of heat caused by too long flow guide path are avoided, and the balance of light weight, low cost and conductivity efficiency is achieved.

[0148] In the embodiments of the present application, along the preset direction (Z), the length of the third flow guide part 2 is in the range of 10mm-20mm, and / or, the length of the second flow guide part 3 is in the range of 1mm-5mm.

[0149] Optionally, the length of the third flow guide part 2 can be any one of the following values, or a value between any two of the following values: 10mm, 10.5mm, 11mm, 11.5mm, 12mm, 12.5mm, 13mm, 13.5mm, 14mm, 14.5mm, 15mm, 15.5mm, 16mm, 16.5mm, 17mm, 17.5mm, 18mm, 18.5mm, 19mm, 19.5mm, 20mm.

[0150] Optionally, the length of the second flow guide part 3 can be any one of the following values, or a value between any two of the following values: 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5mm.

[0151] Optionally, the length of the first flow guide part 1 can be any one of the following values, or a value between any two of the following values: 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5mm.

[0152] Optionally, the total length of the connection terminal 11 along the preset direction (Z) can be any one of the following values, or a value between any two of the following values: 15mm, 15.5mm, 16mm, 16.5mm, 17mm, 17.5mm, 18mm, 18.5mm, 19mm, 19.5mm, 20mm, 20.5mm, 21mm, 21.5mm, 22mm, 22.5mm, 23mm, 23.5mm, 24mm, 24.5mm, 25mm.

[0153] Exemplarily, the length of the first flow guide part 1 is 4 mm, the length of the third flow guide part 2 is 10 mm, the length of the second flow guide part 3 is 1 mm, and the total length of the connection terminal 11 is 15 mm.

[0154] In the technical scheme of the embodiment of the present application, thus, the lengths of the third flow guide part 2 and the second flow guide part 3 are in a suitable range, which can reasonably allocate the use amount of aluminum material and copper material, fully realize the lightweight and low-cost targets, and adapt to the accommodation space inside the relay 10 housing 12 to provide sufficient stroke for the movement of the conductive part 14, facilitate assembly, and balance structural adaptability and performance optimization.

[0155] In the embodiment of the present application, the first flow guide part 1 includes a welding part 4, which is welded and connected with the insulating cover 13; and the welding part 4 is arranged along the circumference of the first flow guide part 1.

[0156] It can be understood that the welding part 4 can be connected with other parts (the part protruding from the housing 12) of the first flow guide part 1, and the insulating cover 13 is connected with the connection terminal 11 by welding.

[0157] Optionally, the material of the welding part 4 is the same as or different from that of other parts (the part protruding from the housing 12) of the first flow guide part 1.

[0158] Exemplarily, the material of the welding part 4 can be copper material, which is different from the aluminum material of the part protruding from the housing 12 of the first flow guide part 1, and can be fixed by electromagnetic welding.

[0159] Exemplarily, the welding part 4 can be continuously arranged along the circumference of the first flow guide part 1, for example, the welding part 4 is annular and arranged along the circumference of the cylindrical first flow guide part 1.

[0160] Exemplarily, a plurality of welding parts 4 can be arranged at intervals along the circumference of the first flow guide part 1, for example, the welding part 4 is block-shaped and arranged at intervals along the circumference of the cylindrical first flow guide part 1.

[0161] In the technical scheme of the embodiment of the present application, since the welding part 4 is arranged along the circumference of the first flow guide part 1, the welding seam area is increased, so that the welding connection strength of the connection terminal 11 and the insulating cover 13 is higher and the stress is more uniform. And the annular sealing structure formed by circumferential welding fully covers the cooperation gap between the connection terminal 11 and the insulating cover 13, blocks dust, water vapor and the like from entering the inside of the insulating cover 13, and adapts to various use environments.

[0162] In the embodiment of the present application, the material of the welding part 4 is copper or aluminum.

[0163] It can be understood that the specific material of the welding part 4 can be copper or copper alloy, such as red copper, CuW, CuCr, etc. Copper has high adaptability to the filler material (such as AgCuTi), and the thermal expansion coefficient is suitable for the insulating cover 13 of ceramic material.

[0164] It can be understood that the material of the welding portion 4 can be aluminum or aluminum alloy. The aluminum material can be removed by a chemical method before welding to remove the oxide film and then brazed with an aluminum-based active filler material.

[0165] In the technical solution of the embodiment of the present application, since the material of the welding portion 4 is copper or aluminum, the welding portion 4 can be welded with the insulating cover by a brazing method, and has good compatibility with the filler material, facilitating molding.

[0166] In the embodiment of the present application, the first flow guide portion 1, the third flow guide portion 2, and the second flow guide portion 3 are cylindrical or circular truncated conical, and the axes of the first flow guide portion 1, the third flow guide portion 2, and the second flow guide portion 3 are consistent.

[0167] It can be understood that the cross section / flow area of the first flow guide portion 1, the third flow guide portion 2, and the second flow guide portion 3 is circular, which reduces the edge current density to a certain extent.

[0168] It can be understood that the axis line refers to a straight line connecting the centers of the two bottom circles of the cylindrical shape. For example, for a cylindrical shape, the axis line refers to a straight line connecting the centers of the two bottom circles of the cylindrical shape.

[0169] It can be understood that the first flow guide portion 1, the third flow guide portion 2, and the second flow guide portion 3 are coaxially connected, making it more convenient to weld and fix.

[0170] As shown in FIGS. 1, 2, and 3, the first flow guide portion 1, the third flow guide portion 2, and the second flow guide portion 3 are coaxially connected. Figure 7 , Figure 8 As shown in FIGS. 1, 2, and 3, the first flow guide portion 1, the third flow guide portion 2, and the second flow guide portion 3 are coaxially connected.

[0171] In the technical solution of the embodiment of the present application, thus, the shapes of the first flow guide portion 1, the third flow guide portion 2, and the second flow guide portion 3 facilitate processing and integration molding. Moreover, due to the high coaxiality, the current can be uniformly distributed when flowing through the entire terminal, reducing the resistance.

[0172] In the embodiment of the present application, in a direction perpendicular to the preset direction (Z), the size of the first flow guide portion 1 is greater than the size of the third flow guide portion 2, and the size of the third flow guide portion 2 is equal to the size of the second flow guide portion 3.

[0173] For example, for a cylindrical flow guide portion, the direction perpendicular to the preset direction (Z) is the radial direction of the flow guide portion.

[0174] It can be understood that the first flow guide portion 1 protrudes from the housing 12, increasing the welding contact area with the busbar 20.

[0175] For example, the first guide section 1, the third guide section 2 and the second guide section 3 are all cylinders, the diameter of the first guide section 1 is 20mm, and the diameters of the third guide section 2 and the second guide section 3 are 16mm.

[0176] For example, the welding part 4 is connected to the first guide part 1, and its shape is annular, with an outer diameter of 18 mm and an inner diameter of 17 mm. The welding part 4 does not contact the third guide part 2, and there is a certain air gap between them.

[0177] In the technical solution of this application embodiment, since the size of the first current guiding part 1 is larger than that of the third current guiding part 2, the first current guiding part 1, as an external connection end, has a larger cross-sectional area and surface area, providing a larger connection area and higher connection strength for welding or other connection methods, and reducing the skin effect and resistance when current flows in. In addition, the third current guiding part 2 has the same cross-sectional size as the second current guiding part 3, making the current flow between dissimilar materials more stable and avoiding additional resistance and heat points caused by cross-sectional changes.

[0178] In the embodiments of this application, such as Figure 4 , Figure 5 As shown, the battery device 100 includes a busbar 20, and the first guide section 1 is connected to the battery module 30 through the busbar 20. The material of the busbar 20 is the same as that of the first guide section 1.

[0179] It is understood that the busbar 20 is a conductive busbar connecting the battery module 30 and the relay 10 to the connection terminal 11, also known as a switch. Besides the battery module 30, the busbar 20 can also connect to other structures, such as a pre-charge resistor, which will not be listed in this embodiment.

[0180] It is understandable that the material of the manifold 20 is the same as that of the first guide part 1, both being made of aluminum.

[0181] It is understandable that the busbar 20 and the connection terminal 11 are connected and fixed in a one-to-one correspondence.

[0182] Optionally, the busbar 20 can be fixed to the protruding portion of the connecting terminal 11 using various welding methods, such as brazing, laser welding, argon arc welding, and electromagnetic pulse welding. Welding secures the busbar 20 to the protruding portion of the connecting terminal 11. This connection method not only avoids the loosening risk associated with traditional bolt fixing but also improves the reliability and strength of the connection, especially under conditions of frequent switching and vibration. The optimization of various welding methods ensures the mechanical strength of the joint, enabling it to withstand complex operating conditions such as vibration and frequent switching environments.

[0183] In the technical scheme of the embodiment of the present application, since the current collector 20 is made of aluminum material, the material cost is reduced while maintaining good electrical conductivity. At the same time, the overall weight of the connecting terminal 11 and the current collector 20 is reduced, which is beneficial to the lightweight design of the battery, improves the energy density and the endurance capability. Moreover, the material of the current collector 20 is the same as that of the first flow guide part 1, which is aluminum material of the same metal, has the same melting point, reduces the welding difficulty, improves the strength and reliability of the welding connection, and further improves the electrical stability.

[0184] In the embodiment of the present application, along the preset direction (Z), the size of the part of the first flow guide part 1 protruding from the shell 12 is 1mm-3mm, and the thickness of the current collector 20 is 1mm-5mm.

[0185] Exemplarily, the thickness of the current collector 20 is designed to be 1-5mm, which can be flexibly adjusted according to actual needs to meet the requirements of electrical conductivity and mechanical strength.

[0186] It can be understood that the size of the first flow guide part 1 is greater than 3mm.

[0187] Exemplarily, along the preset direction (Z), the size of the first flow guide part 1 is 4mm, and the part protrudes from the shell 121 by 3mm. It can meet the welding requirement with the current collector 20, and will not affect the overall design and assembly of the battery device 100.

[0188] Optionally, the size of the part of the first flow guide part 1 protruding from the shell 12 along the preset direction (Z) can be any one of the following values, or a value between any two of the values: 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm.

[0189] Optionally, the thickness of the current collector 20 can be any one of the following values, or a value between any two of the values: 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5mm.

[0190] In the technical solution of this application embodiment, since the size of the portion of the first guide portion 1 protruding from the housing 12 is within a suitable range, this size will not occupy too much external space, and can provide sufficient contact depth for welding with the busbar 20, thereby improving the strength of the weld joint and avoiding incomplete welding. In addition, since the thickness of the busbar 20 is within a suitable range, the thickness and cross-sectional area of ​​the busbar 20 can be flexibly adjusted according to the power requirements and space constraints of the battery device 100 to adapt to various overcurrent requirements.

[0191] The second aspect of this application provides an electrical device, which includes a battery device 100 from the first aspect of this application. The battery device 100 is used to store or provide electrical energy.

[0192] For example, the electrical device could be a vehicle 1000. (e.g.) Figure 1 As shown, a battery device 100 is installed inside 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.

[0193] The specific solutions of the embodiments of this application are described below with reference to the accompanying drawings.

[0194] In a specific embodiment, the battery device 100 includes a relay 10 and a battery module 30. The relay 10 is electrically connected to the battery module 30. The relay 10 includes a housing 12, a connecting terminal 11, and a conductive element 14. The housing 12 defines an accommodating space, and the conductive element 14 is housed in the accommodating space. The housing 12 has a through hole, and the connecting terminal 11 passes through the through hole along a preset direction (Z). The connecting terminal 11 includes a first guide portion 1, a third guide portion 2, and a second guide portion 3 connected sequentially along the preset direction (Z). The first guide portion 1 protrudes from the outside of the housing 12 and is used to electrically connect to the battery module 30. The second guide portion 3 is made of copper, and the first guide portion 1 and the third guide portion 2 are made of aluminum. The conductive element 14 is configured to move along the preset direction (Z) to contact or separate from the second guide portion 3.

[0195] By using aluminum materials in non-critical parts, the use of copper materials is significantly reduced, thereby reducing the overall material cost. Aluminum materials have lower density, significantly reducing the weight of the terminal, and facilitating the lightweight design of the battery device 100. Copper materials are retained at the fixing position of the relay 10 and the connection position of the internal conductive part 14, meeting the requirements of electrical conductivity and mechanical strength in critical parts, and meeting the requirements of high electrical conductivity and high reliability. The price of aluminum materials is much lower than that of copper materials. By changing the external busbar 20 to aluminum material, the material cost is significantly reduced, and the density of aluminum material is lower, further reducing the overall weight of the battery device 100, which is beneficial to improve the energy density and endurance. By selecting aluminum materials with high electrical conductivity (such as 1-series aluminum or 6-series aluminum), the requirements of the battery device 100 for current transmission are met.

[0196] In specific embodiments, by adopting multiple welding methods (soldering, laser welding, argon arc welding, electromagnetic pulse welding, etc.) to connect the busbar 20 and the connecting terminal 11, the risk of loosening of the traditional bolt fixing method is avoided, the stability and long-term reliability of the connection are improved, and the mechanical strength of the joint is significantly improved, which can withstand the stress in the frequent on-off and vibration environment. By optimizing the welding process, the flexibility and applicability of the connection method are ensured, which is suitable for different production needs and application scenarios.

[0197] In specific embodiments, by selecting T2 copper, TU-2 copper, phosphorus deoxidized copper or high-purity copper, the electrical conductivity and durability of the second flow guide part 3 are improved, meeting the requirements of high current transmission. Because the first flow guide part 1 and the third flow guide part 2 are selected to be 1-series aluminum or 6-series aluminum, the electrical conductivity and processing performance are considered, and the reliability and economy of the busbar 20 are improved.

[0198] In specific embodiments, the thickness of the busbar 20 is designed to be 1-5 mm, which can be flexibly adjusted according to actual needs, meeting the requirements of electrical conductivity and mechanical strength. Considering factors such as overcurrent and heating, because the electrical conductivity of copper and aluminum is different, if the top copper layer is replaced with an aluminum layer and the overcurrent demand cannot be met, the terminal diameter can be increased according to the specific overcurrent demand. The cross-sectional area of aluminum is expanded by 1.56 times to achieve the same overcurrent level as copper. The protruding height of the connecting terminal 11 is designed to be 1-3 mm, which can meet the welding requirements of the busbar 20, and will not affect the overall design and assembly of the battery device 100.

[0199] If not specifically stated, all embodiments and optional embodiments of the present application can be combined with each other to form new technical solutions.

[0200] If not specifically stated, all technical features and optional technical features of the present application can be combined with each other to form new technical solutions.

[0201] The above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered in the scope of protection requested by the present application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of protection.

Claims

1. A battery device, characterized by, The relay includes a relay and a battery module, the relay is electrically connected with the battery module, the relay includes a housing, a connecting terminal and a conductive piece, the housing defines a receiving space, the conductive piece is received in the receiving space, the housing is provided with a through hole, the connecting terminal is arranged in the through hole along a preset direction; the connecting terminal includes a first flow guide part and a second flow guide part connected along the preset direction, a part of the first flow guide part protrudes outside the housing and is used for electrically connecting the battery module, the second flow guide part is made of copper, and the first flow guide part is made of aluminum; the conductive piece is configured to be in contact with or separated from the second flow guide part along the preset direction; the maximum cross-sectional area of the first flow guide part is greater than the maximum cross-sectional area of the second flow guide part.

2. The battery device of claim 1, wherein The connecting terminal includes a third flow guide part, which is arranged between the first flow guide part and the second flow guide part along the preset direction, and the two ends of the third flow guide part are connected with the first flow guide part and the second flow guide part respectively.

3. The battery device of claim 2, wherein, The relay includes an insulating cover arranged in the receiving space, and another part of the first flow guide part is arranged in the housing and is welded with the insulating cover.

4. The battery device of claim 2, wherein The ratio of the length of the third flow guide part to the length of the first flow guide part along the preset direction is in the range of 2.5 to 5, and / or the ratio of the length of the second flow guide part to the length of the third flow guide part is in the range of 0.05 to 0.

5.

5. The battery device of claim 2, wherein The length of the third flow guide part along the preset direction is in the range of 10mm-20mm, and / or the length of the second flow guide part is in the range of 1mm-5mm.

6. The battery device of claim 3, wherein The first flow guide part includes a welding part welded with the insulating cover, and the welding part is arranged along the circumference of the first flow guide part.

7. The battery device of claim 6, wherein, The welding part is made of copper or aluminum.

8. The battery device according to any one of claims 2 to 7, characterized by, The first flow guide part, the third flow guide part and the second flow guide part are cylindrical or circular truncated cone-shaped, and the axes of the first flow guide part, the third flow guide part and the second flow guide part are consistent.

9. The battery device of claim 8, wherein, Along a direction perpendicular to the preset direction, the size of the first flow guide part is greater than the size of the third flow guide part, and the size of the third flow guide part is equal to the size of the second flow guide part.

10. The battery device according to any one of claims 1 to 7, characterized by, The battery device includes a busbar, the first flow guide part is connected with the battery module through the busbar, and the material of the busbar is the same as that of the first flow guide part.

11. The battery device of claim 10, wherein, Along the preset direction, the size of the part of the first flow guide part protruding from the housing is 1mm-3mm, and the thickness of the busbar is 1mm-5mm.

12. An electrical device, characterized by The battery device includes the battery device according to any one of claims 1 to 11, and is used for storing or providing electric energy.

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