DC+ and DC- parallel-cooling soft wire of liquid-cooling cable for large-power charging pile

Abstract

A DC+ and DC- parallel-cooling soft wire of a liquid-cooling cable for a large-power charging pile comprises a cooling liquid inner pipe and a conductor part, wherein the cooling liquid inner pipe isembedded to a center of the conductor part in a penetrating way and is of a hollow structure, a hollow part is a cooling liquid inner passage, and a cooling liquid external passage with an annular cross section is arranged between an insulation electrode sleeve and the conductor part. The cooling liquid inner pipe is arranged in the soft conductor of the DC+ and DC- parallel-cooling liquid-coolingcable for the large-power charging pile and is a cooling medium inlet passage, a cooling medium directly enters a terminal of a charging gun through the passage and is sent to a cooling system outside the cable through the cooling external passage formed between an outer wall of a protection copper net and an inner wall of the insulation sleeve, and during the circulation process, heat generatedby working of the cable and the charging terminal can be dissipated out of the cable by the cooling medium.

Description

technical field [0001] The invention belongs to the technical field of cables, and mainly relates to a liquid-cooled cable, in particular to a soft conductor of a special water-cooled cable for high-power charging piles. Background technique [0002] With the rapid development of new energy electric vehicles, fuel vehicles will gradually withdraw from the stage of history, and the accompanying gas stations will also complete their historical mission, and will be replaced by electric vehicle charging stations all over the place. The core facility is the charging pile. The existing electric vehicle charging piles mainly include high-power charging piles and medium-power charging piles according to their power. The technical parameters of high-power charging piles are: DC charging voltage 1000-1500 volts, output current 500-600 amperes; medium-power charging piles The technical parameters of the pile are: the DC voltage is 750 volts, and the output current is 180 amperes. [...

AI Technical Summary

Problems solved by technology

However, the output current of the high-power charging pile reaches 600 amperes, that is, its two DC charging power lines DC+ and DC- must carry a current of 600 amperes. If a dry-type integrated cable is used, the cross section of each power line conductor must be determined by The original 70 square millimeters must be increased to at least 200 square millimeters, and the outer diameter also needs to be increased from 40 millimeters to 100 millimeters, in order to solve the heat dissipation problem of the cable, that is, to work safely and reliably within the allowable temperature range, and so bulky and heavy Not only is it difficult to connect with the charging cable, but it is also impossible to operate

Therefore, the existing dry-type integrated cables can only be used on medium-power charging piles, and cannot be used on high-power charging piles at all. It can be said that the heat dissipation problem of cables has become the main bottleneck restricting the development of high-power charging piles.

[0004] For this reason, the DC+ and DC- parallel-cooled liquid-cooled cables for high-power charging piles invented by the inventor have already applied for a patent in another case, which better solves the heat dissipation problem of the cables, and satisfies the requirements of fast charging of high-power charging piles, small size, light weight, Requirements for convenient operation, but since the DC+ and DC- parallel cooling liquid-cooled cables for high-power charging piles are respectively provided with cooling inner tubes at the center of the two DC wires DC+ and DC- to form a liquid-cooled entry channel, and between the outer wall of the wire and the insulating sleeve A liquid-cooled outflow channel is formed between the inner walls of the tube. Since the wire needs to be installed in the insulating sleeve, if the wire is made of a conventional single solid metal material, it will inevitably affect its flexibility and cannot be bent at will. The larger the cross-section, the more difficult it is to bend. This will inevitably bring great inconvenience to the later installation, and will increase the difficulty of manufacturing. It is necessary to drill a hole in the center of the wire to install the cooling inner tube

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