Vehicle-mounted electrical connection device

Abstract

The utility model discloses a kind of vehicle-mounted electrical connection devices, the device includes substrate, at least one surface mount connector, patch fuse, at least two groups of terminals;The substrate is provided with bending area;The surface mount connector and patch fuse are arranged on the substrate surface;The terminal is arranged on the edge of the substrate, the substrate is bent by the bending area to make each group of the terminal be perpendicular to the substrate and mutually parallel, and the space occupation is compressed by bending area, and integrated patch fuse realizes overcurrent protection.

Description

Technical Field

[0001] This utility model relates to the field of electrical connection technology for new energy vehicle battery packs, specifically a vehicle-mounted electrical connection device integrating overcurrent protection and impact resistance structure. Background Technology

[0002] Currently, electrical connections between modules in new energy battery packs mainly rely on wiring harnesses or FPCA (Fuel-Plug-in Communication Assembly) solutions with connectors. Wiring harnesses occupy a large space and have low automation; traditional FPCAs mostly use surface-mount or plug-in connectors, requiring reflow / wave soldering assembly, resulting in low space utilization, lack of overcurrent protection, and weak resistance to mechanical shock. Abnormal currents or external impacts can easily cause terminal loosening or connection failure, affecting the overall reliability and safety of the pack. The industry urgently needs an on-board electrical connection device that can achieve highly integrated connections within limited installation space, has overcurrent protection, and also has resistance to mechanical shock. Utility Model Content

[0003] In view of this, in order to solve the above problems, this utility model discloses an electrical connection device for vehicles, which provides a highly integrated electrical connection device that simultaneously achieves: reducing space occupation through bending areas; and integrating a patch fuse to achieve overcurrent protection.

[0004] An automotive electrical connection device includes: a substrate, at least one surface-mount connector, a surface-mount fuse, and at least two sets of terminals; the substrate has a bending region for compressing spatial layout through three-dimensional bending; the surface-mount connector and the surface-mount fuse are disposed on the surface of the substrate for highly integrated arrangement; the terminals are disposed on the edge of the substrate, and the substrate is bent in the bending region so that each set of terminals is perpendicular to the substrate and parallel to each other, thereby achieving a compact arrangement and facilitating docking with an external connector housing.

[0005] In some embodiments, the connector housing is further included, the connector housing having a plug-in portion that mates with the terminals; the bending area includes multiple independent bending portions, each bending portion being held in a fixed shape by a fixing member, so that multiple sets of terminals are kept in a fixed spatial arrangement within the connector housing.

[0006] Furthermore, the bending area includes at least three independent bending sections; each bending section is fixed by a fastener and is configured to maintain horizontal equidistant spacing and vertical alignment of the multilayer terminals after insertion into the connector housing.

[0007] Furthermore, the bending portion includes a first bending portion, a second bending portion, and a third bending portion; The first bend is configured to adjust the multilayer terminals to be in the same vertical plane; The second bend is configured to adjust the horizontal spacing between the terminals; The third bend is configured to adjust the alignment of the multiple sets of terminals in the vertical direction.

[0008] In some embodiments, a protective cover is also included, comprising an upper cover and a lower cover that can be docked to each other. The lower cover is provided with a positioning structure for positioning and connecting with a substrate, which cooperates with the positioning structure on the substrate to achieve precise positioning. The upper cover and the lower cover form a closed space through a detachable structure, which effectively improves the overall impact resistance.

[0009] Furthermore, the positioning structure includes a positioning post disposed on the lower cover, which cooperates with a positioning hole disposed on the substrate to achieve alignment.

[0010] Furthermore, the diameter of the positioning hole is 1-2 mm, and the positioning pin is clearance-fitted with the positioning hole.

[0011] In some embodiments, the substrate has a pad area, and the terminal is fixed to the pad area by ultrasonic welding.

[0012] In some embodiments, the surface mount connector and the surface mount fuse are soldered to the substrate surface using surface mount technology (SMT).

[0013] In some embodiments, the pad area consists of multiple electrically isolated independent pads, with slotted isolation provided between adjacent pads.

[0014] In some embodiments, the pads are configured to be larger than the soldering surface of the terminals to ensure soldering reliability.

[0015] Furthermore, the pad dimensions are 6-7mm in length and 3-4mm in width, and the pad area is larger than the terminal soldering surface.

[0016] In some embodiments, the substrate is a flexible circuit substrate, which is a multilayer structure disposed vertically, and the multilayer structure includes at least a conductive layer and an insulating layer.

[0017] Furthermore, the substrate is a single-sided perforated plate, and its multi-layer structure includes: an aluminum foil layer, an adhesive layer covering the upper and lower surfaces of the aluminum foil layer 12, and a polyimide layer covering the adhesive layer, wherein the thickness of the aluminum foil layer is more than 100 μm.

[0018] In some embodiments, the patch fuse has fusing characteristics that match the overcurrent protection requirements of the battery pack, and can blow in the event of an abnormal current to protect the battery pack.

[0019] Furthermore, the number and arrangement density of the terminals are configured according to the circuit layout requirements of the substrate. More specifically, the number of terminals is multiple sets, and the arrangement density of each set of terminals is adjusted according to the circuit integration requirements of the substrate.

[0020] The number and density of terminals can be flexibly configured according to the circuit layout requirements of the substrate, adapting to different electrical connection scenarios.

[0021] A method for manufacturing an on-board electrical connection device, characterized by comprising the following steps: S1: Substrate processing: A single-sided hollow board is prepared by cutting, applying a cover film, forming circuits and punching, wherein the surface of the substrate is subjected to immersion gold treatment, and the thickness of the immersion gold layer is 0.05-0.2μm; S2: SMT assembly: printing solder paste, mounting surface mount connectors and surface mount fuses, and fixing them by reflow soldering; S3: Ultrasonic welding of terminal to pad area; S4: Fit the fastener into the bending area and bend it in three-dimensional space to align the terminal group. The three-dimensional spatial bending includes a first bending portion, a second bending portion, and a third bending portion; The first bend is configured to adjust the multilayer terminals to be in the same vertical plane; The second bend is configured to adjust the horizontal spacing between the terminals; The third bend is configured to adjust the alignment of the multiple sets of terminals in the vertical direction.

[0022] S5: Insert the terminal into the connector housing interface; S6: Install the lower cover of the protective cover by matching the positioning pin with the positioning hole, and fasten the upper cover and lock it in place.

[0023] The beneficial effects of this utility model are as follows: This utility model discloses an electrical connection device for vehicles, the device including a substrate, at least one surface-mount connector, a surface-mount fuse, and at least two sets of terminals; the substrate has a bending area; the surface-mount connector and the surface-mount fuse are disposed on the surface of the substrate; the terminals are disposed on the edge of the substrate, and the substrate is bent so that each set of terminals is perpendicular to the substrate and parallel to each other, thereby reducing space occupation through the bending area; the integrated surface-mount fuse provides overcurrent protection, and the three-dimensional bending structure reduces space occupation; the integrated surface-mount fuse provides overcurrent protection; the protective cover can withstand 50 joules of mechanical impact; the ultrasonic welding process reduces equipment costs. This utility model solves the technical defects of traditional connection solutions, such as large size, lack of active protection, and weak impact resistance. Attached Figure Description

[0024] Figure 1 : This is a layout diagram of the FPC pads of this utility model; Figure 2 : This is a connection structure diagram of the terminals and pads of this utility model; Figure 3: This is a cross-sectional view of the multilayer FPC structure of this utility model; Figure 4 : This is a cross-sectional view of the pad area of ​​this utility model; Figure 5 This is a structural diagram of the FPC pads and terminals after welding according to this utility model; Figure 6 : This is a layout diagram of the positioning holes of the FPC of this utility model; Figure 7 : This is a layout diagram of the bending area of ​​the FPC of this utility model; Figure 8 : This is a layout diagram of the fastener of the FPC of this utility model; Figure 9 This is an assembly diagram of the connector of this utility model; Figure 10 : This is an installation diagram of the protective cover of this utility model; Explanation of symbols for key components.

[0025] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model.

[0026] Substrate 10, pad area 20, pad 21, slot 22, first bend 31, second bend 32, third bend 33, positioning hole 11, aluminum foil layer 12, adhesive layer 13, polyimide layer 14, fastener 15, surface mount connector 40, surface mount fuse 50, terminal 60, connector housing 70, positioning structure 80, upper cover 81, lower cover 82. Detailed Implementation

[0027] The following embodiments are described to aid in understanding this application. These embodiments are not, and should not be, construed in any way as limiting the scope of protection of this application.

[0028] In the following description, those skilled in the art will recognize that throughout this discussion, components may be described as individual functional units (which may include subunits), but those skilled in the art will recognize that various components or portions thereof may be divided into individual components or may be integrated together (including integrated within a single system or component).

[0029] Furthermore, the connection between components or systems is not intended to be limited to a direct connection; on the contrary, data between these components may be modified, reformatted, or otherwise altered by intermediate components. Additionally, other or fewer connections may be used. It should also be noted that the terms "connection," "link," or "input" should be understood to include direct connections, indirect connections via one or more intermediate devices, and wireless connections.

[0030] like Figure 1 , Figure 5As shown, this application proposes an automotive electrical connection device, including: a substrate 10, at least one surface-mount connector 40, a surface-mount fuse 50, and at least two sets of terminals 60; the substrate 10 has a bending area for compressing spatial layout through three-dimensional bending; the surface-mount connector 40 and the surface-mount fuse 50 are disposed on the surface of the substrate 10 to achieve a highly integrated arrangement; the terminals 60 are disposed on the edge of the substrate 10, and the substrate 10 is bent in the bending area so that each set of terminals 60 is perpendicular to the substrate 10 and parallel to each other, thereby achieving a compact arrangement and facilitating docking with external connectors.

[0031] Compared with existing technologies, existing technologies have bulky wiring harness layouts that occupy a lot of space; traditional FPCA uses multi-layer connector stacking, resulting in a large overall structure that is difficult to meet the needs of compact installation of vehicle equipment; and the electrical connection system does not integrate a fuse device, so abnormal current can easily directly impact the battery pack, posing a safety hazard.

[0032] Through the above technical solution, this application significantly reduces space occupation through innovative three-dimensional bending structure, and the integrated patch fuse 50 provides reliable overcurrent protection function. At the same time, its overall structural design enhances the resistance to mechanical shock, effectively solving the technical problems of traditional vehicle electrical connection solutions such as large size, lack of safety protection and poor environmental adaptability. It has significant technical progress and practical value.

[0033] This application further proposes, such as Figure 6 , 9 As shown in Figure 10, the vehicle-mounted electrical connection device also includes a connector housing 70, which has a plug portion that mates with the terminal 60.

[0034] like Figure 7-8 As shown, the bending region includes multiple independent bending sections, each bent section being held in a fixed shape by a fixing member 15, so that multiple sets of terminals 60 are kept in a fixed spatial arrangement within the connector housing 70. The bending region includes at least three independent bending sections, such as a first bending section 31, a second bending section 32, and a third bending section 33. Each bending section is fixed by the fixing member 15 and configured to ensure that the multi-layer terminals 60 are equidistant in the horizontal direction and aligned in the vertical direction after being inserted into the connector housing 70. More specifically, the first bending section 31 is configured to adjust the multi-layer terminals 60 to be in the same vertical plane; the second bending section 32 is configured to adjust the horizontal spacing between the terminals 60; and the third bending section 33 is configured to achieve vertical alignment of multiple sets of terminals 60 through a wavy bend.

[0035] Compared with existing technologies, in traditional vehicle electrical connection solutions, the connector housing 70 usually adopts a combination of rigid PCB board and single bending structure, which has the following limitations: the spatial position accuracy of the terminals 60 is low after bending, and misalignment is prone to occur; there is a lack of effective shape fixing mechanism, which makes it easy to deform under vibration environment, leading to connection failure; and it is impossible to achieve high-precision three-dimensional arrangement of multi-layer terminals 60, which limits the connection density and reliability.

[0036] Through the above technical solution, this application solves the problem of insufficient spatial arrangement accuracy of multi-layer terminals 60. By the synergistic effect of multiple bending sections and fixing parts 15, the stability and positional accuracy of terminals 60 in three-dimensional space are ensured. The defect of easy deformation of connection structure under vibration environment is overcome, and the bending shape is permanently maintained by fixing parts 15. The precise alignment of high-density terminals 60 is achieved, which significantly improves the reliability and efficiency of connector shell 70 insertion. At the same time, the horizontally equidistant and vertically aligned terminal 60 arrangement design makes connector shell 70 insertion more convenient and reliable, reducing the risk of misalignment during installation. This structural design provides an innovative solution for high-density vehicle electrical connection, and is particularly suitable for space-constrained new energy vehicle battery pack application scenarios.

[0037] This application further proposes, such as Figure 6 , 9 As shown in Figure -10, a protective cover is also included. The protective cover includes an upper cover 81 and a lower cover 82 that can be mated together. The lower cover 82 is provided with a positioning structure 80 for positioning and connecting with the substrate 10. The upper cover 81 and the lower cover 82 form a closed space through a detachable structure. The positioning structure 80 includes a positioning post disposed on the lower cover 82. The positioning post cooperates with a positioning hole 11 disposed on the substrate 10 to achieve alignment. The diameter of the positioning hole 11 is 1-2 mm, and the positioning pin is clearance-fitted with the positioning hole 11.

[0038] Compared with existing technologies, traditional automotive connector protection solutions mostly adopt integrated packaging or simple cover structures, which have the following shortcomings: lack of precise positioning mechanism, misalignment is easy to occur during installation, affecting assembly accuracy; the protective structure is not removable or difficult to disassemble, which is not conducive to maintenance and repair; insufficient sealing performance, making it difficult to effectively resist dust, moisture and mechanical impact in the automotive environment; and the lack of consideration for coordinated positioning with the substrate 10, resulting in poor overall structural stability.

[0039] Through the above technical solutions, this application solves the problem of precise positioning between the protective cover and the substrate 10. Micron-level assembly accuracy is achieved by using a 1-2mm clearance fit between the positioning pin and the positioning hole 11. The enclosed structure design effectively resists external dust, moisture and mechanical impact. It overcomes the defect of traditional protective structures that cannot be disassembled, and adopts a detachable cover design to facilitate inspection and maintenance. It eliminates the fit deviation between the protective cover and the connector shell, and improves the stability and reliability of the overall structure. It effectively prevents the protective cover from shifting or falling off due to vibration.

[0040] This application further proposes, such as Figure 2 , Figure 5 As shown, the substrate 10 has a pad area 20, and the terminal 60 is fixed to the pad area 20 by ultrasonic welding.

[0041] Compared with existing technologies, in traditional vehicle electrical connection devices, the connection between terminal 60 and the circuit board is usually achieved by reflow soldering or wave soldering, which has the following significant drawbacks: the high-temperature soldering process can easily damage heat-sensitive components; it is difficult to achieve high-precision soldering of micro-pitch terminals 60; solder joints are prone to defects such as cold solder joints and poor solder joints; multiple processes such as solder paste printing, preheating, and reflow are required; and expensive special equipment such as reflow ovens are required.

[0042] Through the above technical solutions, this application solves the problem of large heat damage in traditional welding methods. Ultrasonic welding, a low-temperature connection process, overcomes the problem of insufficient welding precision in high-density terminals 60, achieves micron-level welding precision, eliminates quality hazards such as incomplete welding and cold welding, improves connection reliability, simplifies the production process, reduces equipment investment and energy consumption, and improves welding consistency and yield.

[0043] This application further proposes that the surface-mount connector 40 and the surface-mount fuse 50 are soldered to the surface of the substrate 10 by SMT process.

[0044] Compared with existing technologies, the installation of surface-mount connectors 40 and surface-mount fuses 50 in traditional vehicle electrical connection devices usually adopts one of the following methods, all of which have obvious shortcomings: drilling is required, which occupies a large space and has a low degree of automation; surface-mount connectors 40 and surface-mount fuses 50 adopt different processes, which makes the process complicated; surface-mount fuses 50 are installed as independent components in the later stage, which increases the number of connection points and reduces reliability; poor consistency, low efficiency, and difficulty in guaranteeing quality.

[0045] Through the above technical solutions, this application solves the problem of inconsistent mounting processes for various components, realizes a standardized SMT process, overcomes the shortcomings of low space utilization in traditional mounting methods, and completes the installation of surface-mount connectors 40 and surface-mount fuses 50 in the same SMT process, achieving high integration and improving assembly density; the SMT process provides consistent and reliable soldering quality, eliminates the quality risks caused by multi-point soldering, and improves overall reliability; it avoids the additional connection points and potential failure points caused by retrofitting surface-mount fuses 50; and it solves the problems of low efficiency and poor consistency of manual soldering.

[0046] This application further proposes that the pad area 20 is composed of multiple electrically isolated independent pads 21, and a slot 22 is provided between adjacent pads 21 for isolation. The size of the pads 21 is configured to be larger than the welding surface of the terminal 60. The size of the pads 21 is 6-7mm in length and 3-4mm in width, and the area of ​​the pads 21 is larger than the welding surface of the terminal 60.

[0047] Compared with existing technologies, the design of the solder pad 21 in traditional vehicle electrical connection devices has the following technical defects: the use of ordinary green oil or solder resist layer for isolation has limited voltage resistance and is prone to arc discharge and short circuit; the size of the solder pad 21 is similar to that of the terminal 60, requiring extremely high alignment accuracy, which easily leads to poor welding; the heat is concentrated during welding, which easily causes thermal damage to the substrate 10 material; the area of ​​the solder pad 21 is limited, the connection strength is insufficient, and the vibration resistance is poor; electrochemical migration is prone to occur in humid environments, leading to short circuits.

[0048] Through the above technical solutions, this application has completely solved the problems of arc discharge and short circuit between pads under high voltage environment; overcome the technical difficulty of excessively high welding alignment accuracy requirements and eliminate the risk of thermal damage to substrate 10 during welding process; significantly improved the welding strength and connection reliability of terminal 60; and effectively prevented electrochemical migration in humid environment.

[0049] More specifically, the slot 22 design provides physical isolation, effectively preventing high-voltage arcs and short circuits; the area of ​​the pad 21 is 20-30% larger than the welding surface of the terminal 60, significantly reducing the alignment accuracy requirements and improving the welding yield; increasing the area of ​​the pad 21 improves heat distribution and avoids heat damage; expanding the welding area increases tensile strength and significantly enhances vibration resistance; the slot 22 blocks electrochemical migration paths, improving the reliability of the product in humid environments; increasing the area of ​​the pad 21 reduces current density, lowers temperature rise, and improves current carrying capacity.

[0050] This application further proposes, such as Figure 3-4 As shown, the substrate 10 is a flexible circuit substrate with a multi-layer structure arranged vertically, and its multi-layer structure includes at least a conductive layer and an insulating layer.

[0051] FPC structure: Single-sided perforated board, multi-layer structure consisting of an aluminum foil layer 12, an adhesive layer 13 covering the upper and lower surfaces of the aluminum foil layer 12, and a polyimide layer 14 covering the adhesive layer 13. The thickness of the aluminum foil layer 12 is more than 100μm.

[0052] Compared with existing technologies, traditional vehicle electrical connection devices typically use the following substrate solutions, all of which have obvious limitations: rigid substrates have no bending capability at all, making it impossible to achieve three-dimensional spatial layout and severely limiting the design; poor temperature resistance, usually <120℃, and weak interlayer bonding; poor flexibility, making it difficult to achieve complex bending and springback; and cannot simultaneously satisfy conductivity, insulation and flexibility.

[0053] Through the above technical solutions, this application achieves three-dimensional bending through a flexible substrate, perfectly adapting to the confined space of an automotive environment and solving the problem that traditional rigid substrates cannot achieve three-dimensional spatial bending layouts; the polyimide layer 14 overcomes the problem of insufficient temperature resistance of ordinary FPCs; the adhesive layer 13 provides strong interlayer bonding force, and the aluminum foil layer 12 with a thickness of over 100μm provides excellent current carrying capacity while maintaining good flexibility; the multi-layer structure provides uniform heat distribution and reduces thermal resistance; mature materials and processes are used, resulting in lower costs compared to special substrates; it is resistant to moisture, vibration, and chemical corrosion, fully meeting automotive-grade requirements.

[0054] This application further proposes that the patch fuse 50 is connected in series in the electrical circuit, and its fusing threshold matches the overcurrent protection requirements of the battery pack; the number and arrangement density of the terminals 60 are configured according to the circuit layout requirements of the substrate 10. More specifically, the number of terminals 60 is multiple groups, and the arrangement density of each group of terminals 60 is adjusted according to the circuit integration requirements of the substrate 10.

[0055] Compared with existing technologies, existing vehicle electrical connection solutions have the following significant drawbacks in terms of circuit protection and terminal 60 configuration: most adopt external surface mount fuses 50 or have no overcurrent protection at all, resulting in slow response speed and inaccurate protection; the surface mount fuses 50 have a single specification and cannot match the specific protection of different battery packs; the number of terminals 60 is fixed and the arrangement density is uniform; existing designs are difficult to adjust and expand according to system upgrade requirements.

[0056] Through the above technical solution, this application precisely matches the fusing threshold of the patch fuse 50 with the characteristics of the battery pack to protect against errors; and the number and arrangement density of the terminals 60 are adjustable to meet the needs of battery packs with different capacities.

[0057] This application further proposes that, A method for manufacturing an on-board electrical connection device includes the following steps: Processing flexible printed circuit board (FPC) substrate 10: A single-sided hollow board is prepared by cutting, applying cover film, circuit forming and punching, wherein the surface of the flexible printed circuit board (FPC) 10 is subjected to immersion gold treatment, and the thickness of the immersion gold layer is 0.05-0.2μm. SMT assembly: Print solder paste, mount surface mount connectors 40 and surface mount fuses 50, and fix them by reflow soldering; Ultrasonic welding terminal 60 to pad 21; Adhesive paper 15 is applied to the bending area and bent in three-dimensional space to align the positioning of the 60 terminal groups; The three-dimensional spatial bending includes: a first bending portion 31, which places the multi-layer terminals 60 in the same vertical plane; a second bending portion 32, which adjusts the horizontal spacing of the terminals 60; and a third bending portion 33, which achieves vertical alignment through a wavy bending.

[0058] Insert terminal 60 into connector housing 70 socket; Install the lower cover 82 of the protective cover by engaging the positioning pin with the positioning hole 11, and then fasten the upper cover 81 and snap it in place.

[0059] The beneficial effects of this utility model are as follows: This utility model discloses an electrical connection device for vehicles, the device including a substrate 10, at least one surface-mount connector 40, a surface-mount fuse 50, and at least two sets of terminals 60; the substrate 10 has a bending area; the surface-mount connector 40 and the surface-mount fuse 50 are disposed on the surface of the substrate 10; the terminals 60 are disposed on the edge of the substrate 10, and the substrate 10 is bent so that each set of terminals 60 is perpendicular to the substrate 10 and parallel to each other, thereby reducing space occupation through the bending area; the integrated surface-mount fuse 50 realizes overcurrent protection, and the three-dimensional bending structure reduces space occupation; the integrated surface-mount fuse 50 realizes overcurrent protection; the protective cover can withstand 50 joules of mechanical impact; the ultrasonic welding process reduces equipment costs. This utility model solves the technical defects of traditional connection solutions, such as large size, lack of active protection, and weak impact resistance.

[0060] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A vehicle-mounted electrical connection device, characterized in that, include: The substrate (10), at least one surface-mount connector (40), a surface-mount fuse (50), and at least two sets of terminals (60) are provided; the substrate (10) has a bending area; the surface-mount connector (40) and the surface-mount fuse (50) are disposed on the surface of the substrate (10); the terminals (60) are disposed on the edge of the substrate (10); the substrate (10) is bent in the bending area so that each set of terminals (60) is perpendicular to the substrate (10) and parallel to each other.

2. The vehicle-mounted electrical connection device according to claim 1, characterized in that, It also includes a connector housing (70), which has a plug-in portion that mates with the terminal (60); the bending area includes multiple independent bending portions, each bending portion is kept in a fixed shape by a fastener (15), so that multiple sets of the terminal (60) are kept in a fixed spatial arrangement within the connector housing (70).

3. The in-vehicle electrical connection device according to claim 2, characterized by The bending area includes a first bending portion (31), a second bending portion (32), and a third bending portion (33); the first bending portion (31) is configured to adjust the multiple layers of terminals (60) to be in the same vertical plane; the second bending portion (32) is configured to adjust the horizontal spacing between the terminals (60); and the third bending portion (33) is configured to adjust the alignment of multiple sets of terminals (60) in the vertical direction.

4. The in-vehicle electrical connection device according to any one of claims 1 to 3, characterized by It also includes a protective cover, which is assembled and positioned with the substrate (10) through a positioning structure (80).

5. The in-vehicle electrical connection device according to claim 4, characterized by The protective cover includes an upper cover (81) and a lower cover (82) that can be docked to each other. The lower cover (82) is provided with a positioning structure (80) for positioning and connecting with the substrate (10). The upper cover (81) and the lower cover (82) form a closed space through a detachable structure.

6. The in-vehicle electrical connection device according to claim 5, characterized by The positioning structure (80) includes a positioning post disposed on the lower cover (82), which cooperates with a positioning hole (11) disposed on the substrate (10) to achieve alignment.

7. The in-vehicle electrical connection device according to claim 1, characterized by The substrate (10) has a pad area (20) which includes a plurality of electrically isolated independent pads (21).

8. The in-vehicle electrical connection device according to claim 7, characterized by The size of the pad (21) is configured to be larger than the soldering surface of the terminal (60).

9. The vehicle-mounted electrical connection device according to claim 1, characterized in that, The substrate (10) is a flexible circuit substrate with a multi-layer structure arranged vertically, and its multi-layer structure includes at least a conductive layer and an insulating layer.

10. The in-vehicle electrical connection device according to claim 1, characterized by The number and arrangement density of the terminals (60) are configured according to the circuit layout requirements of the substrate (10).

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