A charging cable with cooling channels and an electric vehicle charging station

Abstract

This utility model discloses a charging cable with a cooling channel and an electric vehicle charging pile. The charging cable includes a cable sheath and a cable core. The cable core is wrapped with the cable sheath, and the cable sheath has several interconnected spiral holes forming a spiral cooling channel. A circulating cooling medium is provided within the spiral cooling channel. The surface of the spiral cooling channel has an oleophilic texture. The electric vehicle charging pile includes the aforementioned charging cable with a cooling channel. One end of the charging cable is connected to a charging gun. The contact angle formed by the oleophilic surface on the inner surface of the spiral cooling channel of the charging cable at the charging gun end is smaller than the contact angle formed by the oleophilic surfaces on other surfaces within the spiral cooling channel. This utility model can reduce the temperature of the charging cable during long-term charging and ensure that the cable temperature at the manually operated charging gun end is lower than the temperature of other areas of the cable.

Description

Technical Field

[0001] This utility model relates to the field of electric vehicle charging technology, and in particular to a charging cable with a cooling channel and an electric vehicle charging pile. Background Technology

[0002] Currently, with social development, the electric vehicle industry has also made significant progress. However, the problem of excessively long charging times greatly restricts the development of the electric vehicle industry. Existing electric vehicles shorten charging time by increasing the charging current. However, increasing the charging current will cause severe overheating of charging cables and other connecting facilities, making the charging cables prone to damage, or increasing additional energy consumption during transmission due to the increased temperature.

[0003] To deliver higher charging currents, charging cables need to be thicker. However, if the charging cable becomes too thick, it becomes too heavy to handle manually. Charging cables with a rated continuous charging current exceeding 300A are too heavy to handle and therefore require active cooling during charging. Existing charging cables, however, have low heat exchange efficiency, often resulting in overheating. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a charging cable and electric vehicle charging pile with a cooling channel, which can reduce the temperature of the charging cable during long-term charging and ensure that the temperature of the cable at the manually operated charging gun end is lower than the temperature of other areas of the cable.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows: A charging cable with a cooling channel, comprising a cable sheath and a cable core; The cable core is wrapped with a cable sheath, and the cable sheath has several interconnected spiral holes, which form a spiral cooling channel. The spiral cooling channel is equipped with a circulating cooling medium; The surface of the spiral cooling channel is provided with an oleophilic texture.

[0006] Furthermore, the spiral cooling channel is either a non-equidistant spiral cooling channel or an equidistant spiral cooling channel.

[0007] Furthermore, when the spiral cooling channel is a non-equidistant spiral cooling channel, the pitch of the spiral cooling channel gradually decreases according to the direction of the charging current.

[0008] Furthermore, the texture of the oleophilic surface consists of several arrayed micro-pits, with the spacing between adjacent micro-pits between 60 μm and 90 μm and the depth of the micro-pits between 30 μm and 40 μm, which is used to ensure that the contact angle between the cooling medium and the inner surface of the spiral cooling channel is greater than 40° and less than 90°.

[0009] Furthermore, the micro-pit is a hemisphere, and the diameter of the hemisphere is between 50 μm and 60 μm.

[0010] Furthermore, it also includes a metal sheath. When the cable core is a multi-core cable, the metal sheath is wrapped around the outer layer of the multi-core cable, and the outer layer of the metal sheath is wrapped around the cable sheath.

[0011] Furthermore, the cable sheath has two symmetrical spiral holes, one end of which is connected by an arc-shaped groove, and the two interconnected spiral holes form a spiral cooling channel.

[0012] Furthermore, the spiral cooling channel is provided with at least one inlet and one outlet, both of which are located on the outside of the cable sheath.

[0013] Furthermore, it also includes a heat exchange system, which comprises a circulating pump, a heat exchanger, and a liquid storage tank; The outlet is sequentially connected to the heat exchanger, liquid storage tank, circulating pump, and inlet in a closed loop.

[0014] This utility model also provides an electric vehicle charging pile, which includes the above-mentioned charging cable with cooling channel; one end of the charging cable is connected to a charging gun, and the contact angle formed by the oleophilic surface in the inner surface of the spiral cooling channel of the charging cable connected to the charging gun is smaller than the contact angle formed by the oleophilic surface in other surfaces in the spiral cooling channel.

[0015] By adopting the above technical solution, this utility model has the following beneficial effects: 1. This utility model uses a spiral cooling channel to cool the charging cable, which can meet the long-term charging needs of electric vehicles, prevent the charging cable from overheating, ensure safety and reliability, reduce power loss during transmission, and improve charging efficiency.

[0016] 2. The present invention improves heat exchange efficiency by forming an oil-loving surface texture on the surface of the spiral cooling channel. At the same time, the pitch of the spiral cooling channel gradually decreases according to the direction of the charging current, which can ensure that the cable temperature at one end of the manually operated charging gun is lower than the temperature of other areas of the cable.

[0017] 3. This utility model has wider applicability and can be adapted to multi-core cables or single-core cables. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the internal structure of an embodiment of the present utility model; Figure 2 This is a cross-sectional schematic diagram of an embodiment of the present utility model; Figure 3 This is a schematic diagram of the heat exchange system according to an embodiment of the present invention; Figure 4 This is a cross-sectional view of the texture of the oleophilic surface in an embodiment of the present invention; Among them, 1. Cable sheath; 2. Cable core; 3. Spiral cooling channel; 31. Micro-dimples; 4. Arc-shaped annular groove; 5. Metal sleeve; 6. Circulating pump; 7. Heat exchanger; 8. Inlet; 9. Outlet; 10. Liquid storage tank. Detailed Implementation

[0019] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0020] like Figure 1-4 As shown, in this embodiment, a charging cable with cooling channels is provided. It mainly includes a cable sheath 1 and a cable core 2. The cable core 2 is wrapped around the cable sheath 1. The cable sheath 1 has several interconnected spiral holes forming a spiral cooling channel 3. A circulating cooling medium is provided within the spiral cooling channel 3. The cooling medium is generally cooling oil, which is suitable for the interior of charging cables due to its poor conductivity. The spiral cooling channel 3 can be a non-equidistant spiral cooling channel or an equidistant spiral cooling channel. The cable core 2 mentioned here refers to a cable without the cable sheath 1. Generally, the cable core 2 includes a conductor, an insulator, and a braided wrapping layer. Some cable cores 2 also include a shielding signal layer. The focus of this invention is on the cable sheath 1; therefore, the cable core 2 can be considered a cable conforming to existing technology, only with the external cable sheath 1 changed. The multi-spiral cooling channel 3 has at least one inlet 8 and one outlet 9; both inlet 8 and outlet 9 are located outside the cable sheath 1.

[0021] To improve heat exchange efficiency, a textured surface with an oil-loving surface is formed on the surface of the spiral cooling channel 3, which can increase the residence time of the cooling oil on the surface of the spiral cooling channel 3 and improve heat exchange efficiency.

[0022] When the spiral cooling channel 3 is a non-uniform pitch spiral cooling channel, the pitch of the spiral cooling channel 3 gradually decreases according to the direction of the charging current. This ensures that the temperature of the cable at one end of the manually operated charging gun is lower than the temperature of other areas of the cable. This ensures that the driver will not be injured by the high temperature when he touches the cable at one end of the charging gun after charging is completed.

[0023] refer to Figure 2As shown, when cable 2 is a multi-core cable, the outer layer of the multi-core cable is wrapped with a metal sheath 5, and the outer layer of the metal sheath 5 is wrapped with a cable sheath 1. In this way, the multi-core cable can first exchange heat with the metal sheath 5, and then the metal sheath 5 exchanges heat with the multi-spiral cooling channels 3. In order to improve the heat exchange efficiency of the multi-core cable, the spiral cooling channels 3 inside the cable sheath 1 are in contact with the metal sheath 5.

[0024] refer to Figure 4 As shown, the texture of the oleophilic surface consists of several arrayed micro-pits 31, with the spacing between adjacent micro-pits 31 ranging from 60 μm to 90 μm and the depth of the micro-pits 31 ranging from 30 μm to 40 μm. This ensures that the contact angle between the cooling medium and the inner surface of the cooling channel 3 is greater than 40° and less than 90°. Specifically, the micro-pits 31 are hemispherical, with a diameter between 50 μm and 60 μm.

[0025] by Figure 1 Taking one embodiment of this utility model as an example, the cable sheath 1 has two symmetrical spiral holes, which are connected by an arc-shaped annular groove 4, forming a double spiral cooling channel 3. Each spiral cooling channel 3 has an inlet 8 and an outlet 9; both inlet 8 and outlet 9 are located on the outside of the cable sheath 1. Figure 3 As shown, the heat exchange system includes a circulating pump 6, a heat exchanger 7, and a liquid storage tank 10; the outlet 9 is connected in a closed loop to the heat exchanger 7, the liquid storage tank 10, the circulating pump 6, and the inlet 8. The texture of the oleophilic surface consists of several arrayed micro-pits 31, with an adjacent micro-pit spacing of 80 μm and a depth of 35 μm, used to ensure a contact angle of 50°-60° between the cooling medium and the inner surface of the cooling channel 3. The micro-pits 31 are hemispherical, with a diameter of 55 μm.

[0026] Of course, the utilization rate of the cooling and charging cable of this utility model is best when the number of spiral cooling channels 3 is 2-4, but it is necessary to consider whether the pump pressure will damage the cable sheath 1.

[0027] In addition, this embodiment also provides an electric vehicle charging pile, which includes the aforementioned charging cable, specifically a charging cable with a cooling channel. One end of the charging cable is connected to a charging gun, and the contact angle formed by the oleophilic surface of the inner surface of the spiral cooling channel 3 of the charging cable connected to the charging gun is smaller than the contact angle formed by the oleophilic surface of other surfaces within the spiral cooling channel 3. Furthermore, considering the manufacturing issues of long charging cables, the long charging cable can be divided into several short cooling charging cables, which can then be connected by a vulcanization bonding process. In this way, several segments of cooling charging cables can be connected to the heat exchange system individually, or several short cooling charging cables can be connected in series to the heat exchange system.

[0028] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0029] The above specific embodiments further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A charging cable with a cooling channel, characterized in that: Includes cable sheath (1) and cable core (2); The cable core (2) is wrapped with a cable sheath (1), and the cable sheath (1) has several interconnected spiral holes, which form a spiral cooling channel (3). The spiral cooling channel (3) is equipped with a circulating cooling medium; The surface of the spiral cooling channel (3) is provided with an oil-loving surface texture.

2. The charging cable with cooling channel according to claim 1, characterized in that: The spiral cooling channel (3) is either a non-equidistant spiral cooling channel or an equidistant spiral cooling channel.

3. A charging cable with a cooling channel according to claim 2, characterized in that: When the spiral cooling channel (3) is a non-equal pitch spiral cooling channel, the pitch of the spiral cooling channel (3) gradually decreases according to the direction of the charging current.

4. A charging cable with a cooling channel according to claim 1, characterized in that: The texture of the oleophilic surface is a plurality of arrayed micro-pits (31), the spacing between adjacent micro-pits (31) is between 60 μm and 90 μm, and the depth of the micro-pits (31) is between 30 μm and 40 μm, so that the contact angle between the cooling medium and the inner surface of the spiral cooling channel (3) is greater than 40° and less than 90°.

5. A charging cable with a cooling channel according to claim 4, characterized in that: The micro-pit (31) is a hemisphere with a diameter between 50 μm and 60 μm.

6. A charging cable with a cooling channel according to claim 1, characterized in that: It also includes a metal sheath (5). When the cable core (2) is a multi-core cable, the outer layer of the multi-core cable is wrapped with the metal sheath (5), and the outer layer of the metal sheath (5) is wrapped with the cable sheath (1).

7. A charging cable with a cooling channel according to claim 1, characterized in that: The cable sheath (1) has two symmetrical spiral holes. One end of the two spiral holes is connected by an arc-shaped groove (4), and the two interconnected spiral holes form a spiral cooling channel (3).

8. A charging cable with a cooling channel according to claim 7, characterized in that: The spiral cooling channel (3) is provided with at least one inlet (8) and one outlet (9), both of which are located outside the cable sheath (1).

9. A charging cable with a cooling channel according to claim 8, characterized in that: It also includes a heat exchange system, which includes a circulating pump (6), a heat exchanger (7) and a liquid storage tank (10). The outlet (9) is connected in a closed loop to the heat exchanger (7), the liquid storage tank (10), the circulating pump (6), and the inlet (8).

10. An electric vehicle charging station, characterized in that: Including the charging cable with cooling channel as described in any one of claims 1-9; One end of the charging cable is connected to the charging gun, and the contact angle formed by the oleophilic surface in the inner surface of the spiral cooling channel (3) of the charging cable connected to the charging gun is smaller than the contact angle formed by the oleophilic surface in other surfaces in the spiral cooling channel (3).

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