Quick-charging external connection cable for large-current soft charging pile and preparation method of quick-charging external connection cable

Abstract

The invention discloses a quick-charging external connection cable for a large-current soft charging pile and a preparation method of the quick-charging external connection cable. According to the invention, outer fluoroplastic of a cooling pipe of a main core wire has temperature resistance and insulation effects, and inner foamed polyethylene with a foaming degree of 65-85% increases the volume of cooling liquid and also has an effective supporting effect; more importantly, when a hollow flexible conductor of the main core wire is prepared, the compression resistance of the cooling pipe is improved, so after all conductor wires are grouped and bundled, the cooling pipe can be used as a support and then stranded to form the cable, the flexibility of the cable can be effectively improved, and compared with a cable of a conventional cooling device, the cable is easier to install, small in bending radius and large in current-carrying capacity; in addition, an temperature-sensitive optical fiber is added when the hollow flexible conductor is formed, and the flow rate of cooling liquid can be controlled according to feedback temperature, so the temperature of the cable is constant; and thus, the charging speed of the cable is greatly improved, the heating problem of the cable is greatly improved, an insulation aging speed is effectively reduced, the service life of the cable is prolonged, and product flexibility is better.

Description

technical field [0001] The invention relates to the technical field of new energy vehicles, in particular to a fast-charging external connection cable of a large-current soft charging pile and a preparation method thereof. Background technique [0002] With the rise of electric vehicles in the general environment, the charging speed of the charging pile has been initially realized from 8 hours to 1 hour fast charging, but it still cannot meet the needs of users, because the charging pile connection line needs to be light and flexible, which limits Problems such as the current of the charging cable and the high temperature and heat generated under the high current state are solved. At present, the charging pile cable mainly adopts the sixth type of circular stranded conductor structure. It is easy to cause heat during use and reduce the current carrying capacity. It not only increases the weight and cost, but also wastes resources, and puts a heavy burden on the charger. At ...

AI Technical Summary

Problems solved by technology

[0002] With the rise of electric vehicles in the general environment, the charging speed of the charging pile has been initially realized from 8 hours to 1 hour fast charging, but it still cannot meet the needs of users, because the charging pile connection line needs to be light and flexible, which limits It solves the current of the charging cable and the high temperature and high heat generated under the high current state.

At present, the charging pile cable mainly adopts the sixth type of circular stranded conductor structure. It is easy to cause heat during use and reduce the current carrying capacity. It not only increases the weight and cost, but also wastes resources, and puts a heavy burden on the charger. At present, the market is in urgent need of a cable with a large carrying capacity that does not increase the wire gauge.

[0003] In the prior art, it has been proposed to design electric vehicle charging cables with cooling pipes, such as the patent No. ZL201720377398. Cables have specific requirements for flexibility, so although the existing technology can achieve cables with a large current carrying capacity without increasing the wire gauge, the prepared cables are not flexible enough, which is not ideal for practical applications.

In addition, although the current cooling scheme can alleviate the heating problem to a certain extent, the drastic change of the cable temperature still has a certain impact on the stability of the cable work.

All in all, the charging speed of the existing electric vehicle charging cable is still not enough, the heating problem of the cable cannot be effectively improved, the aging speed of the insulation cannot be effectively reduced, and the product is not flexible enough

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