Ceramic fireproof liquid-cooled high-voltage cable for electric automobile

Abstract

The utility model belongs to the technical field of new energy automobiles, and particularly relates to a ceramic fireproof liquid-cooled high-voltage cable for an electric automobile, which comprises a sheath layer, a shielding layer, an insulating layer, a conductor and a hollow pipe are arranged in the sheath layer, the shielding layer adopts an oxygen-free metal copper wire, the surface of the shielding layer is tinned, the purity of the copper material is required to be more than 99.99%, and the insulating layer is made of an insulating material. A braided layer is arranged inside the shielding layer, a layer of aluminum-plastic composite belt is wrapped outside the braided layer, the shielding layer is composed of the braided layer and braided copper wires, the braiding process is adopted for shielding, braided wires are 0.21 mm, and the braiding density is 85%. According to the ceramic fireproof liquid-cooled high-voltage cable for the electric vehicle, the cooling pipe made of the polyurethane material is added to the center of the conductor, so that the temperature of the conductor can be effectively reduced while the flexibility of the original conductor is ensured, the cross section of the conductor is smaller, the cost of the cable is lower, and the size is smaller; the fireproof performance of the cable is increased, and the current-carrying capacity of the cable can be increased through combined use.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy vehicles, in particular to a ceramic fireproof liquid-cooled high-voltage cable for electric vehicles. Background Art

[0002] In recent years, with the rapid development of the domestic new energy industry, especially in the field of new energy vehicles, people have become more concerned about the safety of new energy vehicles. The industry's safety requirements have become more stringent. The high-voltage wires in the car, as the connecting blood vessels of new energy vehicles, play a vital role. As a bridge and link for the work of vehicle electrical components, it is the nervous system of vehicle power transmission. It is mainly used to provide power and charging for the vehicle, and to realize the transmission and distribution of automotive electricity. It is an important part connecting battery packs, motors, electronic control systems and charging equipment.

[0003] The high-voltage cables currently used in new energy vehicles are in a state of high voltage, high temperature, and high current as the vehicle is charged and discharged and the power changes during operation. In this state, the insulation material of the cable is always subjected to extremely high temperatures. With long-term high-temperature operation, the insulation of the cable will gradually age, resulting in a reduction in insulation performance, causing the current carrying capacity of the cable to decrease, reducing the kinetic energy of the vehicle's operation, and there is a risk of failure, breakdown, and ignition of the vehicle. If in a continuous flame state, the flame will burn slowly along the direction of the cable, accompanied by a large amount of smoke generated by the combustion.

[0004] As disclosed in Chinese patent CN112331400A, a high-voltage cable for new energy vehicles is provided. The high-voltage cable for new energy vehicles is provided with a silicone rubber insulation layer on the outer surface of the tinned copper stranded conductor, and a tinned copper wire shielding layer is provided on the silicone rubber insulation layer, and a sheath is provided on the tinned copper wire shielding layer, so as to obtain a high-voltage cable body, and the high-voltage cable body is introduced into the cleaning chamber through the left guide frame on the workbench, and the cleaned high-voltage cable body is introduced into the winding frame through the right guide frame, and the high-voltage cable body is wound up by the winding roller on the winding frame to obtain a finished product. In the winding process of the high-voltage cable body, the winding of the cleaned high-voltage cable body is realized by the winding roller 1 on the winding frame. After the winding of the winding roller 1 is completed, the high-voltage cable body is introduced into the winding roller 2 for the high-voltage cable body to be wound again, and the winding roller 1, the winding roller 2 and the winding roller 3 are sequentially wound up on the high-voltage cable body without stopping, so that the winding efficiency of the high-voltage cable body is higher.

[0005] However, the conductor used in the high-voltage cable for new energy vehicles is a single pure copper or tin-plated copper structure. Under high temperature environment, the DC resistance increases and the current carrying capacity decreases. Its insulation layer and sheath layer are a single plastic structure. When the flame is burning, it will continue to burn and produce a large amount of black gas.

[0006] To this end, we proposed a ceramic fireproof liquid-cooled high-voltage cable for electric vehicles to solve the above problems. Utility Model Content

[0007] The purpose of the utility model is to provide a ceramic fireproof liquid-cooled high-voltage cable for electric vehicles to solve the problems raised in the above-mentioned background technology.

[0008] To achieve the above object, the utility model provides the following technical solution: A ceramic fireproof liquid-cooled high-voltage cable for electric vehicles, comprising a sheath layer, wherein a shielding layer, an insulating layer, a conductor and a hollow tube are arranged inside the sheath layer;

[0009] The shielding layer is made of oxygen-free metal copper wire with tin-plated surface. The purity of copper material is required to be above 99.99%. A braided layer is arranged inside the shielding layer and a layer of aluminum-plastic composite tape is wrapped around the outside of the braided layer. The shielding layer is composed of the braided layer and the braided copper wire. The shielding adopts a weaving process, the braided wire is 0.21 mm, and the weaving density is 85%.

[0010] Preferably, the insulating layer is made of ceramic polyolefin material or ceramic silicone rubber material of corresponding temperature grade, and adopts extrusion process to ensure the roundness of the sheath, with an outer diameter between 14.5 and 15.5 mm, the thinnest point is 1.04 mm, and the insulation concentricity requirement is ≥70%.

[0011] Preferably, the central structure of the conductor is a cooling tube, and the copper wires are twisted in the outer layer of the cooling tube and twisted together with the copper wires to form a liquid-cooled conductor.

[0012] Preferably, the hollow tube is fixedly installed inside the conductor.

[0013] Preferably, the cooling tube of the conductor center structure is made of polyurethane material.

[0014] Preferably, the sheath layer is made of ceramic polyolefin material or ceramic silicone rubber material of corresponding temperature grade, and adopts extrusion process, with concentricity ≥70%, and is extruded through special heterogeneous die. The outer diameter of the expanded sheath layer is between 18.5 and 19.5 mm, and its thickness is between 1.0 mm and 1.5 mm.

[0015] Preferably, the oxygen-free metal copper material of the conductor is generally bare copper, and the purity is required to be above 99.99%. The conductor adopts a regular twisted structure in which the number of copper wires is between 45 and 500, and the single wire diameter is.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. The ceramic fireproof liquid-cooled high-voltage cable for electric vehicles can effectively reduce the temperature of the conductor while ensuring the flexibility of the original conductor by adding a cooling tube made of polyurethane material in the center of the conductor, thereby achieving a smaller conductor cross-section, lower cable cost and smaller size.

[0018] 2. The ceramic fireproof liquid-cooled high-voltage cable for electric vehicles uses ceramic materials for the insulation layer and the sheath layer to increase the fire resistance of the cable. The combined use can increase the current carrying capacity of the cable. When the cable is under a 600°C flame, a hard ceramic hard protective layer will be formed. The insulation electrical performance is further improved, and the erosion of the flame can be further isolated, thereby ensuring that the car can transmit electrical energy in the event of a fire, thereby ensuring the normal operation of the new energy vehicle functions and the personal safety of the people in the car. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0020] Figure 2 It is a schematic diagram of the oblique structure of the utility model;

[0021] Figure 3 It is a front cross-sectional structural schematic diagram of the utility model;

[0022] Figure 4 It is a schematic diagram of the oblique cross-sectional structure of the utility model.

[0023] In the figure: 1. Sheath layer; 2. Shielding layer; 3. Insulation layer; 4. Conductor; 5. Hollow tube. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1-Figure 4 , the utility model provides a technical solution: a ceramic fireproof liquid-cooled high-voltage cable for electric vehicles, comprising a sheath layer 1, wherein a shielding layer 2, an insulating layer 3, a conductor 4 and a hollow tube 5 are arranged inside the sheath layer 1;

[0026] The shielding layer 2 is made of oxygen-free metal copper wire, the surface is tinned, and the purity of the copper material is required to be above 99.99%. A braided layer is arranged inside the shielding layer 2, and a layer of aluminum-plastic composite tape is wrapped around the outside of the braided layer. The shielding layer 2 is composed of the braided layer and the braided copper wire.

[0027] The insulating layer 3 is made of ceramic polyolefin material or ceramic silicone rubber material of the corresponding temperature grade, and the extrusion process is adopted to ensure that the sheath is round and easy to peel. The insulation concentricity requirement is ≥70%. The central structure of the conductor 4 is a cooling tube. The copper wire is twisted in the outer layer of the cooling tube and twisted together with the copper wire to form a liquid-cooled conductor 4. The cooling tube of the central structure of the conductor 4 is made of polyurethane material. By adding the cooling tube made of polyurethane material in the center of the conductor 4, the temperature of the conductor 4 can be effectively reduced while ensuring the flexibility of the original conductor 4, so as to achieve a smaller cross-section of the conductor 4, a lower cable cost, and a smaller size. The hollow tube 5 is fixedly installed inside the conductor 4.

[0028] The sheath layer 1 adopts ceramic polyolefin material or ceramic silicone rubber material of corresponding temperature grade, and adopts extrusion process, and its concentricity is ≥70%. By using ceramic materials for the insulation layer 2 and the sheath layer 1, the fire resistance of the cable is increased, and the combined use can increase the current carrying capacity of the cable. The conductor 4 is oxygen-free metal copper material, generally bare copper, and the purity is required to be above 99.99%. The conductor 4 adopts a regular twisted structure in which the number of copper wires is between 45-500, and the single wire diameter.

[0029] Working principle: The cooling tube is made of polyurethane material with high tensile strength, excellent physical properties, resistance to liquid erosion, and little change in physical and mechanical properties under long-term liquid immersion. Conductor 4 is made of oxygen-free metal copper, generally bare copper, with a purity requirement of more than 99.99%, and excellent copper resistivity. Conductor 4 adopts a regular twisted structure, with the number of copper wires in conductor 4 between 45-500 and a single wire diameter between 0.08-0.50mm.

[0030] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

Claims

1. A ceramic fireproof liquid-cooled high-voltage cable for electric vehicles, comprising a sheath layer (1), characterized in that: The sheath layer (1) is provided with a shielding layer (2), an insulating layer (3), a conductor (4) and a hollow tube (5); The shielding layer (2) is made of oxygen-free metal copper wire, the surface of which is tinned, and the copper material purity is required to be above 99.99%. A braided layer is arranged inside the shielding layer (2) and a layer of aluminum-plastic composite tape is wrapped around the outside of the braided layer. The shielding layer (2) is composed of the braided layer and the braided copper wire.

2. A ceramic fireproof liquid-cooled high-voltage cable for electric vehicles according to claim 1, characterized in that: The insulating layer (3) is made of ceramic polyolefin material or ceramic silicone rubber material of corresponding temperature grade, and adopts extrusion technology to ensure that the sheath is round and easy to peel off, and the insulation concentricity requirement is ≥70%.

3. A ceramic fireproof liquid-cooled high-voltage cable for electric vehicles according to claim 1, characterized in that: The central structure of the conductor (4) is a cooling tube, and the copper wires are twisted in the outer layer of the cooling tube and twisted together with the copper wires to form a liquid-cooled conductor (4).

4. A ceramic fireproof liquid-cooled high-voltage cable for electric vehicles according to claim 1, characterized in that: The hollow tube (5) is fixedly installed inside the conductor (4).

5. The ceramic fireproof liquid-cooled high-voltage cable for electric vehicles according to claim 1, characterized in that: The cooling tube of the central structure of the conductor (4) is made of polyurethane material.

6. A ceramic fireproof liquid-cooled high-voltage cable for electric vehicles according to claim 1, characterized in that: The sheath layer (1) is made of ceramic polyolefin material or ceramic silicone rubber material of corresponding temperature grade, using an extrusion process, and has a concentricity of ≥70%.

7. A ceramic fireproof liquid-cooled high-voltage cable for electric vehicles according to claim 1, characterized in that: The oxygen-free metal copper material of the conductor (4) is generally bare copper, and the purity is required to be above 99.99%. The conductor (4) adopts a regular twisted structure in which the number of copper wires is between 45 and 500, and the single wire diameter is.

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