KR20240039240A - Fluid cooling type charging cable for fast charging of electric vehicles - Google Patents

Abstract

A liquid-cooled cable for fast charging electric vehicles is disclosed. The liquid cable for rapid charging of electric vehicles according to the present invention includes an internal flow path formed along the center of the cable to allow coolant to flow, a spiral baffle installed to form the internal flow path into a spiral flow path, and a spiral baffle. The point is to include a conductor section made up of several wires wound on the outside and an insulating tube covering the conductor section. In a liquid-cooled cable for rapid charging of electric vehicles of this configuration, improved cooling performance can be expected because the cooling liquid flowing along the internal passage is spread uniformly in the direction of the conductor located on the outside without stagnation due to the spiral baffle installed in the internal passage. , the internal flow path is divided into a spiral shape by the spiral baffle, so that the flow path of the coolant can be secured as long as possible in a limited space, and heat exchange with the conductor part can be performed more reliably, greatly improving cooling efficiency. In addition, from the cable's perspective, the internal spiral baffle functions as a core, preventing fatigue destruction of the conductor due to repeated bending of the cable, which has an advantageous effect in terms of durability. When bending the cable, the surface of the conductor and the inner peripheral surface of the insulating tube are damaged. The problem of the prior art, which created an uncoolable area where the coolant could not flow due to direct contact, can also be definitely improved.

Description

Liquid cooling type charging cable for fast charging of electric vehicles}

The present invention relates to a charging cable for fast charging of electric vehicles that connects the main body of an electric vehicle fast charger and a charging connector. In particular, the present invention relates to a charging cable for fast charging of electric vehicles that flows coolant inside the cable and directly cools the high-temperature heat generated from the conductors during high-voltage fast charging with the coolant. This relates to a liquid-cooled charging cable for charging.

Recently, with the popularization of electric vehicles, electric vehicle charging facilities are expanding, and in particular, fast chargers capable of rapid charging to enable charging in a short period of time are rapidly becoming popular. Moreover, with the standardization of domestic electric vehicle technology, the fast chargers (400 kW or more) that will be distributed in the future are expected to have a charging speed more than twice as fast as existing fast chargers (50 kW to 250 kW).

The charging speed of an electric vehicle is closely related to the voltage of the charging current. Naturally, the higher the voltage, the faster the charging speed. However, the more rapid charging uses high-voltage current, the more problematic the high-temperature heat generated from the cable during charging (more precisely, the high-temperature heat generated from the current-carrying conductor) becomes a problem. This is because high temperatures damage the cable, shortening its lifespan, and have a significant impact on charging performance.

In addition, the high temperature heat generated during the fast charging process can not only increase the risk of fire, but also the charging temperature is increased by the high temperature heat during the process of attaching the charging connector to the electric vehicle connector or separating it from the electric vehicle connector and placing it on the charger. If the cable touches the user's body, it may cause discomfort or anxiety, and in severe cases, it may cause burns, so technology to suppress temperature rise is essential.

Reducing the internal resistance by increasing the conductor diameter of the charging cable has some effect in suppressing temperature rise because the amount of heat generated is reduced to the extent that the internal resistance is reduced. However, it is difficult to sufficiently reduce heat to the desired level by increasing the conductor diameter, and in particular, there is a problem in that the electric vehicle charging cable becomes bulky and heavy as the conductor diameter increases, making it difficult to handle.

One of the technologies proposed as an alternative to solve the problem of temperature rise of the charging cable due to rapid charging is liquid cooling technology. This technology suppresses the temperature rise of the conductor by forming a passage (cooling passage) through which the coolant can flow inside the charging cable and circulating the coolant here to directly cool the conductor. Here, insulating oil with electrical insulating properties is mainly used as the coolant.

Figure 1 is a cross-sectional schematic diagram of a charging cable to show a representative example of a conventional liquid-cooled charging cable that suppresses the temperature rise of the conductor by allowing cooling liquid to flow inside the charging cable.

In the liquid-cooled charging cable according to the prior art, as shown in FIG. 1, a conductor 100 is disposed at the center of the cable through which electricity flows, and an insulating tube 200 is spaced concentrically with the conductor 100. It is coated to surround the conductor 100. At this time, a spacer 300 is interposed between the insulating tube 200 and the conductor 100 to maintain the gap, and the passage 400 formed between the conductor 100 and the insulating tube 200 by the spacer 300 is It becomes a cooling channel through which the coolant flows.

However, the conventional liquid-cooled charging cable as shown in Figure 1, in which the conductor is located at the center of the cable and the cooling passage is formed on the outside, has a problem in that heat is accumulated because the cooling liquid cannot directly reach the inner center of the conductor 100, and the cable When bending (bending), there is a problem that the cooling passage located outside the bending direction is partially compressed as shown in Figure 2, resulting in a blind spot for cooling.

For example, if the charging cable is bent (bent) to the other side of the area where the spacer 300 does not pass, the surface of the internal conductor 100 directly touches or is close to the insulating tube 200 in the area where the spacer 300 does not pass. As a result, a channel compression area (A) in which the channel 400 is narrowed or partially closed occurs, and the coolant cannot flow into the area (A) where the channel compression occurs, or the flow rate is extremely reduced, causing the temperature of the conductor 100 to increase. The effect of suppressing the rise decreases.

If the conductor is not sufficiently cooled due to compression of the flow path due to charging cable bending and the resulting blind spot in cooling, the charger lowers the power supplied to the charging cable as a follow-up measure for safety to reduce heat generation in the charging cable. , reducing the power will increase the charging time of electric vehicles, which will inevitably lead to customer dissatisfaction.

Korean Patent Publication No. 10-2022-0112722 (publication date 2022. 08.11.) US Patent US 11,348,705 (registration date 2022.05.31.)

The technical problem that the present invention aims to solve is a method in which the coolant spreads from the inner center of the charging cable to the outside. Even if the charging cable is bent, the problem of compression of the internal flow path (channel through which the coolant flows) and the resulting blind spot in cooling is solved. The goal is to provide a liquid-cooled charging cable for rapid charging of electric vehicles that can be improved.

Another technical problem that the present invention aims to solve is to arrange a spiral baffle in the flow path (channel through which the coolant flows) formed in the inner center of the charging cable to promote uniform diffusion of the coolant, thereby improving cooling performance. Alternatively, the goal is to provide a liquid-cooled charging cable for fast charging electric vehicles that can further improve cooling efficiency.

According to one embodiment of the present invention as a means of solving the problem,

In the electric vehicle fast charging cable connecting the electric vehicle fast charger body and the connector for electric vehicle fast charging,

an internal flow path formed along the center of the cable to allow coolant to flow;

A spiral baffle installed to form the internal flow path into a spiral flow path;

a conductor section consisting of several wires wound around the outside of the spiral baffle; and

Provided is a liquid-cooled charging cable for rapid charging of electric vehicles, including an insulating tube covering the conductor portion.

One embodiment of the present invention may further include a metal braided wire installed between the conducting wire portion and the spiral baffle to surround the spiral baffle.

The spiral baffle applied in one embodiment of the present invention may be made of a flexible material. For example, the spiral baffle may be made of natural rubber or synthetic rubber.

In one embodiment of the present invention, a concavo-convex surface is formed on the inner circumferential surface of the insulating tube in which concave portions and convex portions are alternately continuous in an arc direction. It may be configured to have a plurality of external flow paths divided between the conductive wire portion and the insulating tube by recesses formed between adjacent iron portions.

According to another embodiment of the present invention as a means of solving the problem,

In the electric vehicle fast charging cable connecting the electric vehicle fast charger body and the connector for electric vehicle fast charging,

an internal flow path formed along the center of the cable to allow coolant to flow;

A support spring installed to partition the internal flow path;

a conductor section made up of several wires wound around the outside of the support spring; and

Provided is a liquid-cooled charging cable for rapid charging of electric vehicles, including an insulating tube covering the conductor portion.

Another embodiment of the present invention may further include a metal braided wire installed between the conducting wire portion and the support spring to surround the support spring.

Here, the support spring is a shape memory alloy (Shape) that increases the freedom of cable shape deformation due to a low elastic modulus when not charged, and restores the original shape by heat applied from the conductor portion when charging to partition the internal flow path in a designed shape. Memory Alloy).

In another embodiment of the present invention, a concave-convex surface composed of concave portions and convex portions alternately formed in an arc direction is formed on the inner peripheral surface of the insulating tube, and the concave portions formed between adjacent convex portions form a concave-convex surface between the conductor portion and the insulating tube. It may be configured to have multiple external flow paths.

Another embodiment of the present invention may further include a spiral baffle installed inside the support spring to form the internal flow path in a spiral shape.

According to an embodiment of the present invention, an internal flow path is formed in the inner center of the charging cable, and a conductor portion composed of several wires wound is disposed outside the inner flow path, so that the cooling liquid flowing along the inner flow path spreads outward and directly cools the conductor portion. Since this is a method, more reliable cooling of the conductors can be implemented compared to the conventional configuration in which the conductors are placed in the center of the cable and the cooling liquid flows outside them.

In addition, the spiral baffle allows the coolant to flow in a spiral manner along the internal flow path and spread toward the conductor located on the outside, so the coolant flows smoothly without concentrating or stagnating in a specific area, resulting in good cooling performance. It can be maintained, and improved cooling performance can be expected because the cooling liquid is delivered uniformly and evenly throughout the conductor part according to the spiral flow of the cooling liquid.

In addition, as the internal flow path is divided into a spiral shape by the spiral baffle placed at the center of the cable, the cooling efficiency can be greatly improved by securing the path for the coolant to flow as long as possible in a limited space, and from the cable's perspective, it can be placed inside. Since the spiral baffle made of elastic material functions as a core, the cable shape can be maintained intact even after repeated bending, and flexibility can be secured during bending.

In addition, since the present invention is a method in which a flow path is formed in the center of the inside to spread the cooling liquid from the inside to the outside, a problem occurs in the prior art in which a conductor is placed in the center of the cable and a cooling flow path is formed through a spacer on the outside of the cable. (During cable bending, the surface of the conductor directly touches the insulating tube in the area where the spacer does not pass, compressing the cooling passage, thereby creating a blind spot in cooling).

1 is a cross-sectional schematic diagram of a liquid-cooled charging cable according to the prior art.
FIG. 2 is a diagram illustrating problems with the conventional liquid-cooled charging cable shown in FIG. 1.
Figure 3 is a partially cut away perspective view showing the internal configuration of a liquid-cooled charging cable for rapid charging of electric vehicles according to an embodiment of the present invention.
Figure 4 is a longitudinal cross-sectional view of the liquid-cooled charging cable shown in Figure 3.
Figure 5 is a perspective view of an operating state according to an embodiment of the present invention showing coolant moving along a movement path (coolant movement path) formed in a spiral shape in the internal flow path by a spiral baffle.
Figure 6 is a longitudinal cross-sectional view of an operating state according to an embodiment of the present invention to explain the process of absorbing heat from the conductor portion while the coolant flows in a spiral shape within the cable.
Figure 7 is a longitudinal cross-sectional view showing a preferred modified example of a liquid-cooled charging cable for rapid charging of electric vehicles according to an embodiment of the present invention.
Figure 8 is a partially cut-away perspective view showing the internal configuration of a liquid-cooled charging cable for rapid charging of electric vehicles according to another embodiment of the present invention.
Figure 9 is a longitudinal cross-sectional view of the liquid-cooled charging cable shown in Figure 8.
Figure 10 is a perspective view of an operating state according to another embodiment of the present invention.
Figure 11 is a longitudinal cross-sectional view in an operating state according to another embodiment of the present invention.
Figure 12 is a longitudinal cross-sectional view showing a preferred modified example of a liquid-cooled charging cable for rapid charging of electric vehicles according to another embodiment of the present invention.
Figure 13 is a vertical cross-sectional view showing another preferred modification of a liquid-cooled charging cable for rapid charging of electric vehicles according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

In describing the present invention, terms used in the following specification are only used to describe specific embodiments and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise.

In addition, in this specification, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are intended to indicate the presence of one or more other It should be understood that this does not exclude in advance the presence or addition of features, numbers, steps, operations, components, parts, or combinations thereof.

In the description with reference to the accompanying drawings, identical drawing reference numerals will be assigned to identical components, and duplicate descriptions of identical components will be omitted. Also, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

The configuration of the present invention will be examined in detail by dividing it into embodiments.

One embodiment

FIG. 3 is a partially cut-away perspective view showing the internal structure of a liquid-cooled charging cable for rapid charging of electric vehicles according to an embodiment of the present invention, and FIG. 4 is a longitudinal cross-sectional view of the liquid-cooled charging cable shown in FIG. 3.

Referring to Figures 3 and 4, the present invention is a cable for fast charging an electric vehicle that connects the main body of an electric vehicle fast charger and a connector (charging cable side connector) for fast charging an electric vehicle, and has a charging cable (1, hereinafter) along the center inside. , for convenience of explanation, it is referred to as a 'cable') and includes an internal passage 10 having a circular longitudinal cross-sectional shape, which is continuous in the longitudinal direction and is divided into a certain cross-sectional area.

By driving a circulation pump (not shown) provided in the rapid charger body, coolant, which is a working fluid, is supplied to the internal passage 10 through the inlet (not shown) of the internal passage 10 at one end of the cable, and the supplied coolant is supplied to the inside of the cable. While moving along the internal flow path 10, heat generated from the conductor portion 40, which will be described later during high-voltage fast charging, is absorbed and then returned to the circulation pump through a separate recovery pipe.

For reference, the coolant, which takes heat away from the conductor portion 40 while moving through the internal passage 10 formed along the center of the cable, has electrically insulating properties, has high electrical resistance, low viscosity, and is resistant to oxidation. Insulating oil that is stable can be used. As an example, diphenyl chloride, a non-flammable synthetic insulating oil, may be used as the coolant.

As shown in the drawing (FIG. 3), a spiral baffle (20) in the form of a screw that continues in a spiral shape is installed in the internal passage 10 through which the cooling liquid for cooling the conductor 40 moves. As a result, the path of the internal flow path 10 (the path through which the coolant actually moves) is formed in a spiral shape, and therefore, the coolant within the internal flow path 10 can move from one side of the cable 1 to the other side while flowing in a spiral manner. there is.

The spiral baffle 20 applied to the liquid-cooled charging cable 1 for rapid charging of electric vehicles according to an embodiment of the present invention is bent so that the cable can be flexibly bent in all directions without being limited to a specific direction. It can be made of a flexible material that ensures flexibility and maintains its shape when bending the cable. Preferably, the spiral baffle 20 may be made of natural rubber or synthetic rubber.

On the outside of the spiral baffle 20, a conductive wire portion 40 is disposed in a structure surrounding the spiral baffle 20. The conductor portion 40 is composed of several wires 42 wound in a specific direction on the outside of the spiral baffle 20 (the wires are shown as wound counterclockwise in the drawing, but may also be wound clockwise). This can be done, and high-voltage current for rapid charging can be supplied to the electric vehicle through these conductors.

A metal braided line 30 may be interposed between the conductive wire portion 40 and the spiral baffle 20 in a structure surrounding the outer edge of the spiral baffle 20. In addition to reinforcing the overall rigidity of the cable, the metal braided wire 30 serves to hold the wires on the inside so that they do not become entangled or deviate from the designated position when bending several cables constituting the conductor portion 40, and improves the heat resistance of the cable. It also plays a role in increasing .

Reference numeral 50 covers the conductor portion 40 from the outside to protect the conductor portion 40 from the external environment and at the same time insulates it from the outside to prevent high-voltage current flowing along the conductor portion 40 from leaking to the outside. It refers to the insulating tube 50 that protects users from electric shock. This insulating tube 50 may be made of an insulating material commonly used in electric vehicle charging cables, such as heat-resistant vinyl chloride or fluoropolymer.

The cooling effect on the conductor portion performed as the cooling liquid flows along the internal passage formed inside the liquid-cooled charging cable for rapid charging of electric vehicles according to an embodiment of the present invention configured as described above will be examined with reference to the accompanying drawings.

Figure 5 is a perspective view of an operating state according to an embodiment of the present invention showing the coolant moving along a movement path (coolant movement path) formed in a spiral shape in the internal flow path by the spiral baffle, and Figure 6 is a perspective view of the coolant flowing through the cable. This is a vertical cross-sectional view of the operating state of the present invention to explain the process of absorbing heat of the conductor portion 40 while flowing in a spiral shape within.

Referring to FIGS. 5 and 6, the cooling fluid enters the internal passage 10 through the inlet (not shown) of the internal passage 10 at one end of the cable by driving a circulation pump (not shown) provided in the rapid charger main body, As the supplied coolant moves from one side to the other along the internal flow path (10) inside the cable, it absorbs the high-temperature heat generated in the conductor portion (40) during high-voltage fast charging and then returns to the circulation pump through a separate recovery pipe. I will go.

A spiral baffle (20) in the form of a spirally continuous screw is installed in the internal passage 10 through which the coolant for cooling the conductor 40 moves, so that the path of the internal passage 10 (substantially the coolant This moving path) is formed in a spiral shape, and therefore, the cooling liquid within the internal passage 10 can move from one side of the cable to the other side while flowing in a spiral manner.

According to the spiral flow, the coolant is subjected to centrifugal force in the radial direction of the cable while moving. Accordingly, a portion of the cooling liquid can pass through the metal braided wire 30 and spread evenly to the outer conductor portion 40, and thus, the coolant generated by direct contact with each wire 42 constituting the conductor portion 40 absorbs heat. That is, the temperature of the conductor portion 40 decreases due to the cooling effect of the coolant spreading from the inner center of the cable.

According to one embodiment of the present invention, an internal flow path is formed in the inner center of the charging cable, and a conductor portion composed of several wires wound is disposed outside the inner flow path, so that the cooling liquid flowing along the inner flow path spreads outward and flows into the conductor. Since it is a method of directly cooling the part, more reliable cooling of the conductor can be implemented compared to the conventional configuration in which the conductor is placed in the center of the cable and the cooling liquid flows outside it.

In addition, the spiral baffle allows the coolant to flow in a spiral manner along the internal flow path and spread toward the conductor located on the outside, so the coolant flows smoothly without concentrating or stagnating in a specific area, resulting in good cooling performance. It can be maintained, and the cooling liquid is delivered evenly and evenly throughout the conductor part according to the spiral flow of the cooling liquid, so even cooling performance can be expected.

In addition, as the internal flow path is divided into a spiral shape by the spiral baffle placed at the center of the cable, the cooling efficiency can be greatly improved by ensuring the path through which the coolant flows as long as possible in a limited space, and from the cable's perspective, it is placed inside. Since the spiral baffle made of elastic material functions as a core, the cable shape can be maintained intact even after repeated bending, and flexibility can be secured during bending.

In addition, since the present invention is a method in which a flow path is formed in the center of the inside to spread the cooling liquid from the inside to the outside, the problem occurring in the conventional technology in which a conductor is placed in the center of the cable and a cooling flow path is formed through a spacer on the outside of the cable ( When bending a cable, the problem of blind spots in cooling occurring due to the surface of the conductor directly touching the insulating tube in the area where the spacer does not pass and the cooling passage being compressed can be definitely improved.

Variations of one embodiment

Figure 7 is a longitudinal cross-sectional view showing a preferred modified example of a liquid-cooled charging cable for rapid charging of electric vehicles according to an embodiment of the present invention, in which recessed portions and convex portions are alternately formed in an arc direction on the inner peripheral surface of the insulating tube 50. An uneven surface 62 of a continuous configuration is formed. It is also possible to modify the external flow path 60 into a plurality of partitions between the conductive wire portion 40 and the insulating tube 50 by recesses formed between adjacent iron portions.

According to this modified example, the cooling liquid flows through the external passage 60 outside the conductor portion 40, which is defined by forming the inner peripheral surface of the insulating tube 50 in a concavo-convex shape, and inside the conductor portion 40. Coolant flows simultaneously from the inside and outside of the conductor 40 along the above-mentioned internal passage 10 and the external passage 60, which are formed by 40) cooling performance can be further improved.

Another embodiment

Figure 8 is a partially cut-away perspective view showing the internal structure of a liquid-cooled charging cable for rapid charging of electric vehicles according to another embodiment of the present invention, and Figure 9 is a longitudinal cross-sectional view of the liquid-cooled charging cable shown in Fig. 8, which is similar to the previous work. The same drawing reference numerals will be assigned to the same components that perform the same functions as those in the embodiment.

Referring to Figures 8 and 9, another embodiment of the present invention is a longitudinal cross-section that is continuous in the longitudinal direction of the charging cable (hereinafter referred to as 'cable' for convenience of explanation) along the center of the interior and is divided into a constant cross-sectional area. It includes an internal passage 10 that is circular in shape and a spiral support spring 25 installed at the center of the cable to partition the internal passage 10.

By driving a circulation pump (not shown) provided in the rapid charger body, coolant, which is a working fluid, is supplied to the internal passage 10 through the inlet (not shown) of the internal passage 10 at one end of the cable, and the supplied coolant is supplied to the inside of the cable. While moving along the internal flow path 10, heat generated from the conductor portion 40, which will be described later during high-voltage fast charging, is absorbed and then returned to the circulation pump through a separate recovery pipe.

For reference, the coolant, which takes heat away from the conductor portion 40 while moving through the internal passage 10 formed along the center of the cable, has electrically insulating properties, has high electrical resistance, low viscosity, and is resistant to oxidation. Insulating oil that is stable can be used. As an example, diphenyl chloride, a non-flammable synthetic insulating oil, can be used as the coolant.

The support spring 25, which continues in a spiral shape, is installed in the internal passage 10 through which the cooling liquid for cooling the conductor 40 moves. This support spring 25 ensures bending flexibility when bending the cable. and the shape of the cable can be maintained intact. In particular, the coolant can be uniformly spread outward (toward the conductor portion 40) due to the spiral flow that occurs while the coolant moves along the internal flow path 10 by the support spring 25.

On the outside of the support spring 25, a conducting wire portion 40 is disposed in a structure surrounding the support spring 25. The conductor portion 40 is composed of several wires 42 wound in a specific direction on the outside of the spiral baffle 20 (the wires are shown as wound counterclockwise in the drawing, but may also be wound clockwise). This can be done, and high-voltage current for rapid charging can be supplied to the electric vehicle through these conductors.

A metal braided wire 30 may be interposed between the conductive wire portion 40 and the support spring 25 in a structure surrounding the outer edge of the support spring 25. In addition to reinforcing the overall rigidity of the cable, the metal braided wire 30 serves to hold the wires on the inside so that they do not become entangled or deviate from the designated position when bending several cables constituting the conductor portion 40, and improves the heat resistance of the cable. It also plays a role in increasing .

Reference numeral 50 covers the conductor portion 40 from the outside to protect the conductor portion 40 from the external environment and at the same time insulates it from the outside to prevent high-voltage current flowing along the conductor portion 40 from leaking to the outside. It refers to the insulating tube 50 that protects users from electric shock. This insulating tube 50 may be made of an insulating material commonly used in electric vehicle charging cables, such as heat-resistant vinyl chloride or fluoropolymer.

The cooling effect on the conductor portion performed as the cooling liquid flows along the internal passage formed inside the liquid-cooled charging cable for rapid charging of electric vehicles according to another embodiment of the present invention configured as described above will be examined with reference to the accompanying drawings.

Figure 10 is a perspective view of an operating state according to another embodiment of the present invention showing the movement of coolant along an internal flow path in which a support spring is installed, and Figure 11 is a rapid operation of an electric vehicle according to another embodiment of the present invention shown in Figure 10. This is a vertical cross-sectional view of the operating state of the liquid-cooled charging cable.

Referring to FIGS. 10 and 11 , the cooling liquid enters the internal passage 10 through the inlet (not shown) of the internal passage 10 at one end of the cable by driving a circulation pump (not shown) provided in the rapid charger main body, As the supplied coolant moves from one side to the other along the internal flow path (10) inside the cable, it absorbs the high-temperature heat generated in the conductor portion (40) during high-voltage fast charging and then returns to the circulation pump through a separate recovery pipe. I will go.

Here, a continuous support spring 25 in a spiral shape is disposed in the internal passage 10 through which the cooling liquid for cooling the conductor 40 moves, so that the cooling liquid flows in a spiral manner within the internal passage 10 and moves along the cable. It moves from one side to the other, and is subjected to centrifugal force in the radial direction of the cable while moving.

Accordingly, a portion of the cooling liquid can pass through the metal braided wire 30 and spread evenly to the outer conductor portion 40, thereby absorbing heat generated by direct contact with each wire constituting the conductor portion 40. I do it. That is, the temperature of the conductor portion 40 decreases due to the cooling effect of the coolant spreading from the inner center of the cable.

According to another embodiment of the present invention, an internal flow path is formed in the inner center of the charging cable, and a conductor portion composed of several wires wound is disposed on the outside of the inner flow path, so that the cooling liquid flowing along the inner flow path spreads outward to the conductor. Since it is a method of directly cooling the part, more reliable cooling of the conductor can be implemented compared to the conventional configuration in which the conductor is placed in the center of the cable and cooling liquid flows outside it.

In addition, the support spring causes the coolant to flow in a spiral shape along the internal flow path and spread toward the conductor located on the outside, so the coolant flows smoothly without concentrating or stagnating in a specific area, resulting in good cooling performance. It can be maintained, and improved cooling performance can be expected because the cooling liquid is delivered uniformly and evenly throughout the conductor part according to the spiral flow of the cooling liquid.

In addition, since the support spring placed at the center of the cable functions as a core, the cable shape can be maintained intact even after repeated bending, and flexibility can be ensured during bending. A conductor is placed in the center of the cable and outside it. It is possible to reliably improve the problems that occur in the conventional technology in which cooling passages are formed through spacers (problems that cause blind spots in cooling).

Variants of other embodiments

Figure 12 is a longitudinal cross-sectional view showing a preferred modified example of a liquid-cooled charging cable for rapid charging of electric vehicles according to another embodiment of the present invention. Like the above-described example, the inner peripheral surface of the insulating tube 50 has a main portion in the arc direction. An uneven surface 62 is formed in which the iron parts are alternately continuous. The external passage 60 may be deformed into a plurality of partitions between the conductive wire portion 40 and the insulating tube 50 by the recesses formed between adjacent iron portions.

According to this modified example, the cooling liquid flows through the external passage 60 outside the conductor portion 40, which is defined by forming the inner peripheral surface of the insulating tube 50 in a concavo-convex shape, and inside the conductor portion 40. The cooling liquid flows simultaneously from the inside and the outside of the conductor portion 40 along the above-mentioned internal passage 10 and the external passage 60 formed by the conductor portion 40, which exposes the conductor portion 40 to a larger amount of coolant, thereby improving cooling performance. It can be improved further.

Other variations of other embodiments

FIG. 13 is a vertical cross-sectional view showing another preferred modified example of a liquid-cooled charging cable for rapid charging of electric vehicles according to another embodiment of the present invention. As shown in FIG. 13, the charging cable has the same longitudinal cross-sectional configuration as that of FIG. 9. It is also possible to modify the form by additionally applying the spiral baffle 20 applied to the above-described embodiment. That is, the above-described spiral baffle 20 may be further installed inside the support spring 25.

In the above detailed description of the present invention, only special embodiments thereof have been described. However, it should be understood that the present invention is not limited to the particular form mentioned in the detailed description, but rather is understood to include all modifications, equivalents and substitutes within the spirit and scope of the present invention as defined by the appended claims. It has to be.

1: Liquid cooling charging cable
10: Internal flow path
20: Spiral Baffle
25: Support Spring
30: metal braided wire
40: conductor section
50: Insulating tube
60: External flow path
62: uneven surface

Claims (12)

In the electric vehicle fast charging cable connecting the electric vehicle fast charger body and the connector for electric vehicle fast charging,
an internal flow path formed along the center of the cable to allow coolant to flow;
A spiral baffle installed to form the internal flow path into a spiral flow path;
a conductor section consisting of several wires wound around the outside of the spiral baffle; and
A liquid-cooled charging cable for rapid charging of electric vehicles, including an insulating tube covering the conductor portion.
According to claim 1,
A liquid-cooled charging cable for rapid charging of electric vehicles, further comprising a metal braided wire installed between the conductor portion and the spiral baffle to surround the spiral baffle.
The method of claim 1 or 2,
The spiral baffle is a liquid-cooled charging cable for rapid charging of electric vehicles made of a material with flexibility.
According to claim 3,
A liquid-cooled charging cable for rapid charging of electric vehicles in which the spiral baffle is made of natural rubber or synthetic rubber.
According to claim 1,
On the inner peripheral surface of the insulating tube, a concavo-convex surface is formed in which concave portions and convex portions are alternately continuous in an arc direction.
A liquid-cooled charging cable for rapid charging of electric vehicles in which a plurality of external passages are divided between the conductor portion and the insulating tube by recesses formed between adjacent iron portions.
In the electric vehicle fast charging cable connecting the electric vehicle fast charger body and the connector for electric vehicle fast charging,
an internal flow path formed along the center of the cable to allow coolant to flow;
A support spring installed to partition the internal flow path;
a conductor section made up of several wires wound around the outside of the support spring; and
A liquid-cooled charging cable for rapid charging of electric vehicles, including an insulating tube covering the conductor portion.
According to claim 6,
A liquid-cooled charging cable for rapid charging of electric vehicles, further comprising a metal braided wire installed between the conductor portion and the support spring to surround the support spring.
According to claim 6 or 7,
The support spring is a shape memory alloy (Shape Memory Alloy) that increases the freedom of cable shape deformation due to a low elastic modulus when not charged, and restores the original shape by heat applied from the conductor portion when charging to partition the internal flow path of the designed shape. ) Liquid-cooled charging cable for fast charging of electric vehicles.
According to claim 6,
On the inner peripheral surface of the insulating tube, a concavo-convex surface is formed in which concave portions and convex portions are alternately continuous in an arc direction.
A liquid-cooled charging cable for rapid charging of electric vehicles in which a plurality of external passages are divided between the conductor portion and the insulating tube by recesses formed between adjacent iron portions.
According to claim 6,
A liquid-cooled charging cable for rapid charging of electric vehicles, further comprising a spiral baffle installed inside the support spring to form the internal flow path in a spiral shape.
According to claim 10,
The spiral baffle is a liquid-cooled charging cable for rapid charging of electric vehicles made of a material with flexibility.
According to claim 11,
A liquid-cooled charging cable for rapid charging of electric vehicles in which the spiral baffle is made of natural rubber or synthetic rubber.

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