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As we all know, the core of the development of new energy vehicles is the problem of charging piles, and the "new infrastructure" charging pile trillion market is riding the wind and waves. Now, for the first time, charging piles have been included in a government work report. We will strengthen the development of new types of infrastructure (" new infrastructure "), develop next-generation information networks, expand 5G applications, build charging piles, promote new-energy vehicles, stimulate new consumer demand and boost industrial upgrading. The following is the standard for material properties of new infrastructure: Oil resistance, when gasoline 23℃, 20h, the maximum outside diameter change rate is less than 15%; When it is diesel oil at 23℃ for 20h, the maximum outer diameter change rate is less than 15%. When the oil is 23℃, 20h, the maximum outer diameter change rate is less than 15%. In terms of oil resistance, affected by temperature and time, the change rate of outer diameter is between 15% and 40%. Tear resistance and cracking resistance, according to the test report, the value is greater than 15N/ mm-40N /MM. Bending resistance, tens of thousands of times back and forth, 2.5kV core wire pressure resistance. Wait, Resistant to water and acid and alkali After soaking water at 80°C for 168H and 23°C for 186H, the change rate of mechanical properties is less than 30% Wear and roll resistance Wire application: no more than 6mm2 scraping experiment larger than 6mm2 drag grinding experiment. Scraping: use a steel needle to apply a vertical force to make a circular motion, and record the number of cycles that expose the conductor. Drag and grind: with sandpaper, record the length of sand tape that exposes the conductor. soft Below 80A, even 65-70A. High and low temperature resistance Temperature change: temperature -40℃ to 100℃ for an alternating, humidity control in 80%-100%. Judgment conditions: no cracking, withstand voltage 1KV (immersed in salt water for 10 minutes). Low temperature performance: winding: generally -40℃, thick wall wire can be negotiated by both parties -25℃ Impact: GB/T25085 Thermal aging: (1) 3000h long-term aging: 125℃,3000h, after taking out 16h Judgment basis: no cracking, withstand voltage 1KV (immersed in brine for 10 minutes); 240h short-term aging: 150℃,240h, take out directly to do -25℃ winding experiment for 4h Judgment basis: no cracking, withstand voltage 1KV (immersed in salt water for 10 minutes). Environmental protection flame retardant Halogen-free: chlorine, bromine content less than 1500ppm Low smoke: Ph>4.3, conductivity 60% Flame retardant: IEC60332-1 IEC60332-3C VW-1 inclined 45° combustion. To learn more about EV cable and charging pile cables, please visit OMG's official website: https://www.omgevcable.com/ |
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The high-voltage components are mainly three electric parts, including power battery, driving motor and high-voltage distribution box (PDU) of electric control system. For batteries, there are DC contactors, high-voltage relays, precharge resistors, etc. for motors, there are stators, rotors, current sensors, AC contactors, etc. for electric control systems, there are on-board chargers, PTC, electric compressors, high-voltage line contacts, OBC / DC, DC two in one controllers, etc. Among them, the high-voltage suitable distribution box used in new energy vehicles (pure electric) includes copper plate, circuit breaker, air switch, internal contactor, soft start, frequency conversion container, transformer, contactor, relay, knife fuse switch, surge protector, transformer, ammeter, voltmeter, transfer switch, etc. New energy vehicles usually operate under high-power power power, with voltage up to 700V (DC) and current up to 400A, which poses a great challenge to the design of high-voltage distribution system and the selection of high-voltage parts. Considering the complexity and cost of vehicle space, vehicle architecture, the centralized high-voltage electrical system architecture is widely used in the industry. After the high-voltage power supply directly enters the high-voltage distribution box, it is distributed to the high-voltage electrical products of the system according to the needs of the system. It has high requirements on how to ensure the safety of the whole high-voltage system and its electrical equipment, system insulation, electromagnetic interference, shielding, sealing and vibration resistance. However, at present, most of the high-voltage distribution boxes on the market follow the design concept of industrial high-voltage distribution box, and its safety, reliability and durability can not meet the requirements of automobile working conditions. For example, for high-power loads, such as motor inverter and voltage converter (DC / DC), precharge processing and condition monitoring are required. The traditional electrical circuit is difficult to achieve effective monitoring, which is very easy to cause the damage of high-voltage switch parts, such as terminal adhesion and so on. The industry often adopts products with relatively high electrical parameters to solve this problem, but the volume and cost are not satisfactory. As for the internal parts of new energy vehicles (pure electric), the drive motor controller (commonly known as "MCU") converts high-voltage DC into AC, and interacts with other modules on the whole vehicle to realize the effective control of the drive motor. Motor energy recovery function, inverter, interlock, communication, etc. drive the motor to drive the car. Compared with the engine of traditional fuel vehicles, the chemical energy of fuel combustion is different from that of mechanical energy, and its working efficiency will be higher, which can reach more than 80%. Therefore, compared with traditional vehicles, its energy utilization rate is higher, which can reduce the waste of resources. High voltage distribution box (commonly known as "PDU"), which is a power distribution device for high-voltage power of the whole vehicle, and then transmitted to the distribution device through high-voltage cable. It is mainly used to distribute high-voltage power to each actuator drive, which is similar to the electrical fuse box in low-voltage circuit system. High voltage fuse box PDU (power distribution unit) is composed of many high voltage relays and high voltage fuses. Coordinate the function conversion and energy distribution of high-voltage accessories such as drive motor control system, battery management system, charging management system, DC / DC, electric air conditioning, electric power steering, braking system, etc. The high-voltage distribution unit can also realize the safety protection functions of short-circuit overload, fast power-off protection, anti leakage protection and so on. DC / DC converter. In new energy vehicles, DC / DC is a device that converts high-voltage DC into low-voltage DC. There is no engine on new energy vehicles, and the source of power for the whole vehicle is no longer generators and batteries, but power batteries and batteries. Since the rated voltage of electrical appliances for the whole vehicle is low voltage, DC / DC device is required to convert high-voltage DC power into low-voltage DC power, so as to maintain the power balance of the whole vehicle. On board charger (commonly known as "OBC") is a device that converts alternating current into direct current. Because the power battery is a high-voltage DC power supply, when the AC is used for charging, the AC cannot be directly stored by the battery pack. Therefore, the power conversion device OBC is required to convert the high-voltage AC to high-voltage DC, so as to charge and store the power battery. However, as the high-voltage cable connecting the internal parts of the car, it plays an important role in transmitting power. The automobile high-voltage cable is a kind of "conductor" with "insulation" device, which transmits electric energy through the ignition coil for the ignition of the spark plug, so as to make the engine work. Its structure is not complex. A layer of high-strength insulator is wrapped outside the internal metal conductor through the production process. It can have good insulation, internal transmission and conductivity at high and low temperature. Cables with the following characteristics in Omega cable products. Omega automobile high voltage cable adopts thermosetting material, high temperature resistance, softness, shielding structure and tear resistance. To learn more about EV cable and EV Charging cable, please visit OMG's official website: https://www.omgevcable.com/ |
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With the rapid development of new energy vehicles, high-voltage harness is like the aorta of vehicles. According to the shielding type, the high-voltage harness can be divided into shielding type and non shielding type. The shielding type harness avoids the interference of the interference signal entering the inner conductor and reduces the loss of the transmission signal. Therefore, the shielding wire is widely used by new energy vehicles. The so-called "shielding" in cable structure is essentially a measure to improve the distribution of electric field. The cable conductor is twisted by multiple conductors. It is easy to form an air gap between it and the insulating layer. The surface of the conductor is not smooth, which will cause the concentration of electric field. Add a shielding layer of semiconductor electrical material on the surface of the conductor. When the high-voltage shielding wire is connected with metal, plastic connectors and copper terminals, the shielding net needs to be cut. At present, when many new energy vehicle high-voltage harness manufacturers cut the shielding net, most manufacturers often cut it manually by traditional methods, which is not only inefficient, but also difficult to ensure the quality. In order to improve the efficiency and quality assurance, an automatic integrated equipment integrating the three processes of peeling the outer insulating skin, cutting the shielding net and peeling the inner insulating skin is not considered as the inner insulating skin, with fast efficiency and high precision, so as to ensure the efficiency and quality of the product. The high-voltage connector and high-voltage harness play the role of transmitting electric energy in the new energy vehicle. The high-voltage harness is the main artery connecting the three major electricity (battery, electronic control and motor) of the whole vehicle, and the high-voltage connector is the interface at both ends of the main artery, which is used to realize the rapid conduction and shutdown of the whole connecting circuit. For more EV HV Cable and electric vehicle High-Voltage cable, please visit OMG official website: https://www.omgevcable.com/ |
