A cable and a car

Abstract

This application provides a cable and an automobile. The cable includes a metal core, a functional layer, and an insulating jacket. The metal core conducts current. The functional layer is disposed outside the metal core and is made of a ferrite core. The insulating jacket covers the functional layer and provides insulation. Because the functional layer has electromagnetic response characteristics in the terahertz frequency band, the cable provided by this application has excellent noise suppression capabilities. When current is conducted using this cable, the current exhibits excellent smoothness and stability.

Description

Technical Field

[0001] This application relates to the field of cable technology, and more particularly to a cable and an automobile. Background Technology

[0002] Modern cars are becoming increasingly computerized, integrating various electronic devices to achieve automation and intelligence. Therefore, in order for these electronic devices to perform at their intended level, the current flowing through them must be kept stable.

[0003] A car's battery delivers power from its positive terminal, passing through the car's electronic devices before returning to the negative terminal. The International Electrotechnical Commission (IEC) and national standards generally consider DC voltages below 48V to be safe for humans in dry environments. Automotive systems typically use 12V or 24V DC power systems (like those used in large trucks). The car's frame, body panels, engine, transmission, and other metal components are tightly connected by bolts, welds, etc., forming a large, continuous metal conductor. This is called the "ground reference point" or "ground." Therefore, after flowing from the battery's positive terminal, the current first passes through the car's electronic devices, then through the frame, and finally returns to the negative terminal via the return conductor. In other words, the return conductor connects the frame and the battery's negative terminal, forming a common return path.

[0004] Because the chassis and return wires both have resistance, the current in the entire circuit is relatively low, resulting in low and unstable current in the various electronic devices. This makes it difficult for these devices to perform at their intended level. For example, unstable current can lead to a lower engine ignition success rate, insufficient horn volume, and insufficient headlight brightness. Utility Model Content

[0005] To address the aforementioned problems, embodiments of this application provide a cable and a vehicle that at least partially solve the problems described above.

[0006] According to an embodiment of this application, a cable is provided, which includes a metal core, a functional layer, and an insulating jacket. The metal core is used to conduct current. The functional layer is sleeved on the metal core, and the material of the functional layer includes a ferrite core. The insulating jacket covers the functional layer and serves as insulation.

[0007] Optionally, the material of the functional layer may also include silicon dioxide, iron oxide, manganese, and zinc.

[0008] Optionally, the metal cable core includes multiple tin-plated copper wires.

[0009] Optionally, the cross-section of the metal cable core is circular, and the cross-section of the functional layer is an annular ring, with the functional layer sleeved outside the metal cable core; wherein, the cross-sectional area of ​​the metal cable core is 6-10 square millimeters, or, the diameter of the metal cable core is 8 mm, and the outer diameter of the cross-section of the functional layer is 11 mm.

[0010] Optionally, the functional layer is directly sleeved over the outer surface of the metal cable core; or, the cable further includes a rubber layer and a copper foil layer located between the metal cable core and the functional layer, the rubber layer being directly sleeved over the outer surface of the metal cable core, the functional layer and the copper foil layer having the same length and their ends aligned to form a raised ring, the length of the raised ring being less than half the length of the metal cable core, and the raised ring being located in the center of the metal cable core or near one end of the metal cable core.

[0011] Optionally, the cable further includes two metal adapters, which are respectively connected to the two ends of the metal cable core. The functional layer is located between the two metal adapters along the length of the cable. The metal adapter includes an interconnected ring portion and a connecting lug. The ring portion is fitted onto the end of the metal cable core in an interference fit. The insulating jacket is fitted onto the outside of the functional layer and the ring portion. The connecting lug extends out of the insulating jacket along the length of the cable.

[0012] Optionally, the end face of the ring portion facing the functional layer abuts against the functional layer, and the outer surface of the ring portion is flush with the outer surface of the functional layer.

[0013] Optionally, the dimension of the area of ​​the metal cable core for interference fit with the ring portion along the cable length direction is equal to or greater than the dimension of the ring portion along the cable length direction.

[0014] Secondly, this application also provides an automobile, the automobile including a battery, electrical equipment, a frame and the aforementioned cable, wherein the positive terminal of the battery, the electrical equipment, the frame, the cable and the negative terminal of the battery are electrically connected in sequence.

[0015] Optionally, the vehicle also includes a ground cable, one end of which is connected to the vehicle frame, the other end of which is connected to one end of the cable, and the other end of the cable is connected to the negative terminal of the battery.

[0016] The cable provided in this application utilizes a ferrite core, a material with high permeability, which exhibits excellent electromagnetic response characteristics in the terahertz frequency band. When electromagnetic noise exists in the current, the ferrite core can dissipate the energy of the electromagnetic noise by converting it into heat energy through hysteresis loss and eddy current loss, thereby effectively suppressing or eliminating electromagnetic noise in the current and making the current smooth and stable. Simultaneously, the ferrite core also possesses good temperature and chemical stability, maintaining its performance under various harsh environments, thus ensuring the long-term reliable operation of the cable. Therefore, when electromagnetic noise appears in the current within the metal core, the functional layer can quickly respond to suppress or eliminate this electromagnetic noise, thereby minimizing or suppressing electromagnetic noise in the current, making the current smoother and the voltage more stable. Thus, because the cable includes a functional layer, the cable provided in this application has excellent noise suppression capabilities, and when current is conducted using this cable, the current will exhibit excellent smoothness and stability. Attached Figure Description

[0017] The accompanying drawings are intended only to illustrate and explain this application and do not limit the scope of this application.

[0018] Figure 1 This is a schematic diagram of the structure of a cable provided in an embodiment of this application.

[0019] Figure 2 for Figure 1 A schematic diagram of the cross-section at point AA.

[0020] Figure 3 for Figure 1 A schematic diagram of the cross-section at point BB.

[0021] Figure 4 This is a schematic diagram of a cable provided in an embodiment of this application after the insulating jacket has been omitted.

[0022] Figure 5 For based on Figure 4 A top view of the cable schematic is provided, omitting the insulation jacket and functional layers.

[0023] Figure 6 This is a schematic diagram of a cable adapter provided in an embodiment of this application.

[0024] Figure 7 For based on Figure 6 A top view of the provided metal adapter.

[0025] Figure 8 This is a schematic diagram of another cable structure provided in an embodiment of this application.

[0026] Explanation of reference numerals in the attached figures:

[0027] 10 - Metallic cable core, 20 - Functional layer, 30 - Insulating jacket,

[0028] 40 - Metal adapter; 41 - Ring body; 42 - Connecting lug; 421 - Connecting hole;

[0029] 51-Rubber layer, 52-Copper foil layer. Detailed Implementation

[0030] To provide a clearer understanding of the technical features, objectives, and effects of the embodiments of this application, the specific implementation methods of the embodiments of this application will now be described with reference to the accompanying drawings.

[0031] In this document, “illustrative” means “serving as an example, illustration or description”, and any illustration or implementation described herein as “illustrative” should not be construed as a more preferred or advantageous technical solution.

[0032] To keep the drawings concise, only the parts relevant to the invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, some figures show only one or more components with the same structure or function, or only one or more are labeled.

[0033] Firstly, this application provides a cable, with reference to Figure 1 and Figure 2 The cable includes a metal core 10, a functional layer 20, and an insulating jacket 30. The metal core 10 is used to conduct current. The functional layer 20 is sleeved on the outside of the metal core 10. The material of the functional layer 20 includes a ferrite core. The insulating jacket 30 covers the functional layer 20 and is used for insulation.

[0034] Based on the above technical solution, ferrite cores, being a material with high permeability, exhibit excellent electromagnetic response characteristics in the terahertz frequency band. When electromagnetic noise exists in the current, the ferrite core can dissipate it by converting the energy of the electromagnetic noise into heat energy through hysteresis loss and eddy current loss, thereby effectively suppressing or eliminating electromagnetic noise in the current and making the current smooth and stable. Simultaneously, ferrite cores also possess good temperature and chemical stability, maintaining their performance unchanged under various harsh environments, thus ensuring the long-term reliable operation of the cable. Therefore, when electromagnetic noise appears in the current of the metal cable core 10, the functional layer 20 can quickly respond to suppress or eliminate the electromagnetic noise, thereby minimizing or suppressing electromagnetic noise in the current, making the current smoother and the voltage more stable. Thus, because the cable includes the functional layer 20, the cable provided in this application has excellent noise suppression capabilities, and when current is conducted using this cable, the current will have excellent smoothness and stability.

[0035] Furthermore, when the cable provided in this application is connected to electronic devices, the excellent smoothness and stability of the current conducted by the cable facilitates a more stable and sufficient current supply to the electronic devices, which helps improve their performance. For example, connecting the cable to an engine ignition system can improve the success rate of engine ignition; simultaneously, due to the enhanced current stability, the spark from the spark plugs will be strengthened, and the electrostatic charging phenomenon in the engine block will be suppressed, thereby improving combustion efficiency, increasing torque, and improving fuel consumption. In addition, the cleanliness of exhaust gases is also expected to be improved. For example, connecting the cable to a horn can make the horn volume more powerful. For example, connecting the cable to a light fixture can make the light brighter. For example, using the cable in an audio system can enhance the volume of the bass and improve sound quality.

[0036] The cable provided in this application will be described in more detail below.

[0037] In one possible embodiment, the material of functional layer 20 also includes silicon dioxide, iron oxide, manganese, and zinc. The essence of noise suppression is energy dissipation, that is, converting harmful electromagnetic energy into heat and dissipating it. This process requires not only that the material can "keep up" with the rhythm of noise changes, but also that it can absorb noise over a wide frequency range. Functional layer 20 is made of a composite of ferrite core, silicon dioxide, iron oxide, manganese, and zinc. Thus, the electromagnetic loss mechanisms of functional layer 20 itself (such as dielectric loss and resistive loss) are effective over a very wide frequency range (from MHz, GHz to THz), thereby absorbing noise over a wide frequency range. This gives functional layer 20 a highly efficient broadband noise suppression capability, effectively suppressing or eliminating electromagnetic noise from the current in the metal cable core 10.

[0038] Among them, silicon dioxide has good insulation and chemical stability, and can be stably mixed with other materials to maintain a certain mechanical strength and chemical stability of the functional layer 20. This helps the functional layer 20 maintain its performance in different environments and ensures the long-term reliable operation of the cable. Iron oxide has unique electromagnetic properties and can generate specific electromagnetic responses in the terahertz frequency band, which helps to suppress electromagnetic noise. The addition of manganese and zinc elements can adjust the electromagnetic characteristics of the functional layer 20, enhance its ability to absorb and attenuate electromagnetic noise at specific frequencies, and help to achieve efficient broadband noise suppression. These materials work together to enable the functional layer 20 to quickly respond to and suppress electromagnetic noise in the current of the metal cable core 10, thereby ensuring the smoothness and stability of the current and improving the performance of electronic equipment connected to the cable.

[0039] In one possible embodiment, the metal cable core 10 includes multiple tin-plated copper wires. Tin plating prevents copper wire oxidation, extending the cable's lifespan; furthermore, the tin layer reduces the surface resistance of the copper wires, decreasing energy loss during current transmission and allowing current to pass through the metal cable core 10 more efficiently, further improving current stability and smoothness.

[0040] In one example, multiple tinned copper wires can be twisted together to form a cable core structure. This structure enhances the cable's flexibility and tensile strength; moreover, during current transmission, the tinned copper wires work together to better distribute the current, reducing heat generated by excessive local current, further improving the cable's safety and stability.

[0041] In one example, the metal core 10 may include 50 tin-plated copper wires with a diameter of 0.45 mm. This specification of the metal core 10 ensures current transmission capacity while also possessing good flexibility and maneuverability, facilitating wiring and installation in practical applications.

[0042] In one possible embodiment, reference Figure 2 The cross-section of the metal cable core 10 is circular, and the cross-section of the functional layer 20 is a ring. The functional layer 20 is sleeved on the outside of the metal cable core 10.

[0043] In one example, the cross-sectional area of ​​the metal cable core 10 can be 6-10 square millimeters. For example, it can be 6, 7, 8, 9, or 10 square millimeters. By designing a cross-sectional area of ​​6-10 square millimeters, it is possible to ensure that the metal cable core 10 has sufficient current-carrying capacity when transmitting current, avoiding cable overheating or even damage due to excessive current carrying capacity, and meeting the current requirements of most electronic devices. On the other hand, it also keeps the metal cable core 10 within a suitable thickness range, allowing the cable to maintain appropriate flexibility and good mechanical strength, facilitating installation and use.

[0044] Alternatively, in another example, the cross-section of the metal cable core 10 is a circle with a diameter of 8 mm, and the cross-section of the functional layer 20 has an outer diameter of 11 mm. That is, the cross-section of the functional layer 20 is a ring with a thickness of 3 mm, an inner diameter of 8 mm, and an outer diameter of 11 mm.

[0045] Regarding the insulating jacket 30, it can be made of high-strength, wear-resistant polyvinyl chloride (PVC) material. This material not only has excellent insulation properties, effectively preventing current leakage and ensuring safe use, but also possesses excellent anti-aging and UV resistance, allowing for long-term use in various harsh environments without easily being damaged, thus extending the overall service life of the cable. At the same time, PVC material is soft, facilitating cable laying and installation, and meeting the needs of different application scenarios.

[0046] In one possible implementation, refer to Figure 1 and Figure 2 The functional layer 20 can be directly fitted and covered on the outer surface of the metal cable core 10. That is, the cable can be formed by sequentially fitting the functional layer 20 and the insulating jacket 30 around the metal cable core 10. This structure is simple and direct. During manufacturing, the metal cable core can be prepared first, then the functional layer material can be evenly wrapped around the metal cable core, and finally the insulating jacket can be fitted on. The functional layer 20, directly fitted over the metal cable core 10, can make closer contact with it. During current transmission, it can respond more quickly to electromagnetic noise generated by the current in the metal cable core 10, promptly suppressing or eliminating noise and ensuring the smoothness and stability of the current. Simultaneously, the insulating jacket 30, tightly wrapped around the functional layer 20, provides reliable insulation protection for both the functional layer 20 and the metal cable core 10, preventing external factors from damaging the internal structure of the cable and ensuring safe and stable operation of the cable in various environments.

[0047] Alternatively, in another possible implementation, refer to Figure 8 The cable also includes a rubber layer 51 and a copper foil layer 52 located between the metal core 10 and the functional layer 20. The rubber layer 51 is directly sleeved and covered on the outer surface of the metal core 10. The functional layer 20 and the copper foil layer 52 are of the same length and their ends are aligned to form a raised ring. The length of the raised ring is less than half the length of the metal core 10, and the raised ring is located in the center of the metal core 10 or near one end of the metal core 10. Based on this technical solution, the rubber layer 51 can play an insulating protection role, preventing the metal core 10 and the copper foil layer 52 from making conductive contact; while the copper foil layer 52 and the functional layer 20 are stacked together to form a raised ring sleeved on the metal core 10, which can enhance the suppression effect of electromagnetic noise. Specifically, the copper foil layer 52 has good conductivity and can reflect and absorb some electromagnetic waves, reducing the interference of external electromagnetic noise on the current in the metal core 10; the functional layer 20 further absorbs and attenuates the remaining electromagnetic noise through its own electromagnetic loss mechanism. The two work together to form a highly efficient electromagnetic noise suppression system. Meanwhile, placing the convex ring in the center or near one end of the metal cable core 10 allows for flexible adjustment according to actual usage requirements, better adapting to electromagnetic environments in different scenarios. Furthermore, the presence of the rubber layer increases the cable's flexibility and tensile strength, improving its overall durability.

[0048] In one example, the length of the rubber layer can be close to the length of the metal cable core 10 to provide insulation protection. The insulating jacket 30 can cover the outside of the convex ring and the rubber layer. Through the covering effect of the insulating jacket 30, the convex ring can also be limited and fixed to the metal cable core 10.

[0049] In one possible embodiment, reference Figure 1 ,as well as Figures 3 to 7 The cable also includes two metal adapters 40, which are respectively connected to the two ends of the metal cable core 10. A functional layer 20 is located between the two metal adapters 40 along the length of the cable. Each metal adapter 40 includes an interconnected ring portion 41 and a connecting lug 42. The ring portion 41 is fitted onto the end of the metal cable core 10 with an interference fit. An insulating jacket 30 is fitted over the functional layer 20 and the ring portion 41. The connecting lug 42 extends beyond the insulating jacket 30 along the length of the cable. Based on this technical solution, the interference fit of the ring portion 41 onto the end of the metal cable core 10 ensures a stable connection between the metal adapter 40 and the metal cable core 10, allowing current to flow effectively between them. The connecting lug 42 extends beyond the insulating jacket 30 along the length of the cable, facilitating connection to interfaces of electronic devices or other cable connection components. Therefore, by setting the metal adapter 40, it is possible to easily connect the cable to electronic equipment or other cables in a detachable manner, and to ensure stable current transmission at the connection point, reduce resistance and electromagnetic noise caused by poor connection, and further improve the performance and reliability of the entire cable system.

[0050] In one example, reference Figure 4 The connecting ear plate 42 is provided with a connecting hole 421. The connecting hole 421 can be used to fix the connecting ear plate 42 to other components. For example, after fasteners such as bolts pass through the connecting hole 421, the connecting ear plate 42 can be fixed together with the interface of electronic equipment or other cable connection components, thereby realizing a reliable connection between the cable and the external equipment.

[0051] In this process, the ring portion 41 of the metal adapter 40 can be first fitted onto the metal cable core 10, and then the ring portion 41 can be compressed and deformed by pressing to press against the metal cable core 10, thereby achieving an interference fit between the metal cable core 10 and the ring portion 41.

[0052] In one possible embodiment, reference Figure 4The end face of the ring portion 41 facing the functional layer 20 abuts against the functional layer 20, and the outer surface of the ring portion 41 is flush with the outer surface of the functional layer 20. That is, the outer diameter of the ring portion 41 is equal to the outer diameter of the functional layer 20. This design, with the end face of the ring portion 41 facing the functional layer 20 abutting against the functional layer 20, achieves several advantages. First, it allows the length of the functional layer 20 to be close to the length of the metal cable core 10, resulting in a larger contact area. This ensures a more comprehensive and continuous suppression of electromagnetic noise from the current in the metal cable core 10. Second, it avoids gaps between the ring portion 41 and the functional layer 20 along the cable length, providing sufficient inner support for the insulating jacket 30 during wrapping. This prevents external depressions in the insulating jacket 30, avoiding potential stress concentrations or weak points due to uneven surfaces and improving the cable's appearance. Furthermore, since the outer surface of the ring portion 41 is flush with the outer surface of the functional layer 20, the insulating jacket 30 can be wrapped more smoothly and tightly, further enhancing the overall structural strength and insulation performance of the cable. This flush design also improves the cable's appearance, making it more aesthetically pleasing for industrial products.

[0053] In one possible embodiment, reference Figure 4 The dimension of the area of ​​the metal cable core 10 used for interference fit with the ring portion 41 along the cable length direction is equal to or greater than the dimension of the ring portion 41 along the cable length direction. This design maximizes the contact area between the ring portion 41 and the metal cable core 10, ensuring stable electrical connection between the metal cable core 10 and the metal adapter 40, reducing contact resistance, and allowing for smoother current transmission. This effectively avoids potential localized overheating or electromagnetic interference problems caused by poor contact.

[0054] Of course, the difference between the dimension of the metal cable core 10 used for interference fit with the ring body 41 along the cable length direction and the dimension of the ring body 41 along the cable length direction should be controlled within a suitable range. If it is too large, the metal cable core 10 will extend too far out of the ring body 41, which may easily cause leakage risk. For example, it can be controlled within 1mm.

[0055] Based on the aforementioned cable, this application also provides a vehicle comprising a battery, electrical equipment, a frame, and the aforementioned cable, wherein the positive terminal of the battery, the electrical equipment, the frame, the cable, and the negative terminal of the battery are sequentially electrically connected. Thus, when the vehicle is in operation, the current output from the positive terminal of the battery flows sequentially through the electrical equipment and the frame, and then returns to the negative terminal of the battery via the cable provided in this application.

[0056] Based on the beneficial effects of the aforementioned cable, the excellent electromagnetic noise suppression capability of the functional layer 20 in the cable results in a smoother and more stable return current. Therefore, when the cable is connected between the battery negative terminal and the vehicle frame, the vehicle's electrical equipment, such as the engine ignition system, horn, and headlights, will exhibit their inherent superior performance and will not suffer from poor performance due to unstable current. For example, with a more stable current, the engine ignition system will have a higher ignition success rate, increased spark intensity from the spark plugs, and reduced electrostatic charging in the engine block, thereby improving combustion efficiency, increasing torque, and improving fuel consumption. The cleanliness of exhaust gases is also expected to improve. Furthermore, with a stable current, the horn will have a more powerful volume, enhanced bass response in the in-vehicle audio system, and improved sound quality, providing a superior listening experience for occupants. Finally, the headlights will be brighter, providing the driver with better visibility. Moreover, a stable current will ensure that the signals from various sensors in the car are stable and accurate, which in turn will help the Electronic Control Unit (ECU) make correct decisions and control the engine more precisely and reliably.

[0057] Furthermore, the vehicle also includes a grounding cable, one end of which is connected to the vehicle frame, and the other end of which is connected to one end of the cable. The other end of the cable is connected to the negative terminal of the battery. In practical applications, the connection point between the grounding cable and the vehicle frame is usually selected on a metal component of the vehicle frame. These metal components have good conductivity and mechanical strength, ensuring stable current transmission. By setting a grounding cable, the sum of the lengths of the grounding cable and the cable provided in this application only needs to meet the distance requirement between the connection point of the battery negative terminal and the vehicle frame. This reduces the length of the cable provided in this application, which is beneficial for cost reduction. At the same time, connecting the other end of the grounding cable to one end of the cable, and then connecting the other end of the cable to the negative terminal of the battery, forms a complete current loop.

[0058] Users can use the cable provided in this application to improve automobiles. For example, the negative circuit cable (equivalent to the ground cable in this application) that was originally connected between the negative terminal of the battery and the vehicle frame can be removed. Specifically, only the connection between the negative circuit cable and the negative terminal of the battery can be removed. Then, one end of the cable provided in this application can be connected to the negative terminal of the battery, and the other end can be connected to the negative circuit cable, thereby forming the following current path: positive terminal of battery → positive circuit cable → electronic equipment → vehicle frame → negative circuit cable → cable provided in this application → negative terminal of battery.

[0059] Of course, a car may also include components such as an engine and fuel tank. As the core of a car's power, the stable performance of the engine is crucial to the overall operation of the vehicle. The cable provided in this application, with its functional layer 20's excellent suppression of electromagnetic noise, allows for a smoother and more stable current flow back to the engine. When a stable current acts on the engine, the various components inside the engine can work together more precisely. For example, the fuel injection system can more accurately control the amount of fuel injected, and the ignition system can ignite more stably, thereby improving the engine's power output efficiency, reducing engine wear, and extending the engine's service life.

[0060] The fuel tank is primarily used to store the fuel required for vehicle operation. A stable current transmitted through cables to the fuel tank's control system ensures the stable operation of equipment such as the fuel pump. This allows the fuel pump to deliver fuel more reliably from the tank to the engine, preventing uneven fuel supply caused by unstable current. This ensures a continuous and stable fuel supply to the engine, improving fuel efficiency and reducing fuel consumption.

[0061] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0062] The above descriptions are merely illustrative embodiments of this application and are not intended to limit the scope of the embodiments of this application. Any equivalent changes, modifications, and combinations made by those skilled in the art without departing from the concept and principles of the embodiments of this application should fall within the protection scope of the embodiments of this application.

Claims

1. A cable, characterized by The cable includes: Metal cable core (10), the metal cable core (10) is used to conduct current; Functional layer (20), which covers the metal cable core (10), the material of which includes a ferrite core; An insulating jacket (30) covers the functional layer (20) and serves as an insulating layer.

2. The cable of claim 1, wherein, The metal cable core (10) comprises multiple tin-plated copper wires.

3. The cable of claim 1, wherein, The cross-section of the metal cable core (10) is circular, and the cross-section of the functional layer (20) is a ring. The functional layer (20) is sleeved on the outside of the metal cable core (10).

4. The cable according to any one of claims 1-3, characterized in that, The functional layer (20) is directly sleeved and covered on the outer surface of the metal cable core (10); or, The cable also includes a rubber layer (51) and a copper foil layer (52) located between the metal core (10) and the functional layer (20). The rubber layer (51) is directly sleeved and covered on the outer surface of the metal core (10). The functional layer (20) and the copper foil layer (52) are of the same length and their ends are aligned to form a convex ring. The length of the convex ring is less than half the length of the metal core (10). The convex ring is located in the center of the metal core (10) or near one end of the metal core (10).

5. The cable according to claim 4, characterized in that, The cable also includes two metal adapters (40), which are respectively connected to the two ends of the metal cable core (10). The functional layer (20) is located between the two metal adapters (40) along the length of the cable. The metal adapter (40) includes an interconnected ring portion (41) and a connecting lug (42). The ring portion (41) is fitted onto the end of the metal cable core (10) in an interference fit manner. The insulating jacket (30) is fitted onto the outside of the functional layer (20) and the ring portion (41). The connecting lug (42) extends out of the insulating jacket (30) along the length of the cable.

6. The cable according to claim 5, characterized in that, The end face of the ring portion (41) facing the functional layer (20) abuts against the functional layer (20), and the outer surface of the ring portion (41) is flush with the outer surface of the functional layer (20).

7. The cable according to claim 5, characterized in that, The dimension of the area of ​​the metal cable core (10) used for interference fit with the ring portion (41) along the cable length direction is equal to or greater than the dimension of the ring portion (41) along the cable length direction.

8. A car, characterized in that, The vehicle includes a battery, electrical equipment, a frame, and a cable according to any one of claims 1-7, wherein the positive terminal of the battery, the electrical equipment, the frame, the cable, and the negative terminal of the battery are electrically connected in sequence.

9. The automobile according to claim 8, characterized in that, The vehicle also includes a grounding cable, one end of which is connected to the vehicle frame, the other end of which is connected to one end of the cable, and the other end of the cable is connected to the negative terminal of the battery.

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