Charging System and Charging Device

Abstract

The present invention relates to a charging system and a charging device. A charging system includes three charging seats, a heat exhaust pipe disposed underground, and a heat utilization device that utilizes the exhausted heat. The charging seat has an opening and a heat exhaust port. The heat exhaust port is connected to the heat exhaust pipe. The cooling air inhaled through the opening exchanges heat with the power circuit of the charging seat and then is discharged from the heat exhaust port into the heat exhaust pipe. The temperature of the cooling air discharged into the heat exhaust pipe rises through heat exchange with the power circuit. The cooling air flows through the heat exhaust pipe and is supplied to the heat utilization device.

Description

Technical Field

[0001] The present disclosure relates to a charging system and a charging device. Background Art

[0002] Charging equipment for charging a power storage device mounted on a vehicle or the like is installed, for example, in a parking lot or on a sidewalk. However, the charging equipment occupies installation space and may interfere with walking and vehicle travel. Therefore, techniques for storing the charging equipment below the ground have been developed, such as the charging pole disclosed in Japanese Patent No. 5475407. Summary of the Invention

[0003] The charging equipment stored below the ground rises from the ground during use and is stored below the ground when use is completed. Since the charging equipment is stored below the ground, the heat generated during charging of the power storage device is likely to be trapped in the charging equipment, and its heat dissipation may become a problem. In addition, in terms of effective utilization of energy, it is desirable to use the heat generated by charging of the power storage device for certain purposes.

[0004] The present disclosure provides a charging system that effectively utilizes dissipated heat (exhaust heat) while enhancing heat dissipation of the charging device.

[0005] A charging system according to an aspect of the present disclosure is a charging system for charging a power storage device mounted on a vehicle. The charging system includes: a charging device that is movable and configured to be switchable between a state in which the charging device is stored underground and a state in which the charging device is exposed above the ground; an exhaust heat pipe provided underground; and a heat utilization device connected to the exhaust heat pipe and configured to utilize the exhaust heat supplied from the exhaust heat pipe. The charging device includes a connection device that can be electrically connected to the power storage device, a power supply circuit configured to supply power to the connection device, and an exhaust heat port connected to the exhaust heat pipe.

[0006] With the above configuration, the exhaust heat port of the charging device is connected to the exhaust heat pipe. Therefore, the heat generated by the power supply circuit can be discharged from the exhaust heat port into the exhaust heat pipe. As a result, heat dissipation of the charging device can be enhanced. In addition, the heat utilization device that utilizes the exhaust heat is connected to the exhaust heat pipe. Since the exhaust heat can be utilized by the heat utilization device, the exhaust heat discharged from the exhaust heat port into the exhaust heat pipe can be effectively utilized.

[0007] In the above charging system, the charging device may further include an air inlet and a cooling fan configured to suck cooling air through the air inlet and feed the cooling air to the exhaust heat port.

[0008] In this case, the power supply circuit may be located on a path through which the cooling air flows from the air inlet to the exhaust heat port.

[0009] With the above configuration, the cooling air inhaled through the air inlet flows toward the heat exhaust port, so that the power circuit can be appropriately cooled by the cooling air.

[0010] In the above charging system, the heat exhaust pipe may include a blower device configured to cause the cooling air to flow in a direction from the connection point of the heat exhaust pipe and the heat exhaust port toward the heat utilization device. The charging device may further include a heat sink attached to the power circuit, and at least a part of the heat sink may be exposed to the heat exhaust pipe through the heat exhaust port.

[0011] With the above configuration, at least a part of the heat sink attached to the power circuit is exposed to the heat exhaust pipe through the heat exhaust port, so that the heat sink can be cooled by the cooling air flowing through the heat exhaust pipe. Therefore, the power circuit can be appropriately cooled.

[0012] A charging device according to another aspect of the present disclosure is the following charging device: It is movable and configured to be switchable between a state where the charging device is stored underground and a state where the charging device is exposed above the ground. The charging device includes a connection device that can be electrically connected to a power storage device mounted on a vehicle, a power circuit configured to supply power to the connection device, and a heat exhaust port. The heat exhaust port is connected to a heat exhaust pipe provided underground. A heat utilization device that utilizes the heat exhausted from the heat exhaust pipe is connected to the heat exhaust pipe.

[0013] According to the present disclosure, the dissipated heat (heat exhaust) can be effectively utilized while enhancing the heat dissipation of the charging device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which the same reference numerals represent the same elements, where:

[0015] Figure 1 is a view showing an example of the layout of a charging system according to a first embodiment;

[0016] Figure 2 is a cross-sectional perspective view of a charging system according to a first embodiment; and

[0017] Figure 3 is a cross-sectional perspective view of a charging system according to a second embodiment. DETAILED DESCRIPTION

[0018] Some embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are assigned to the same or corresponding parts, and repeated descriptions thereof will be omitted.

[0019] First Embodiment

[0020] Figure 1Shows an example of the layout of the charging system 1 according to the first embodiment. As Figure 1 shown, a plurality of parking spaces 400 are provided in the parking lot, and the electric vehicle 200 is parked in one of the parking spaces 400.

[0021] In Figure 1 , the parking spaces 400 are provided in the direction of parallel parking by dividing lines 402. In the space 100 adjacent to the parking spaces 400, there are three charging seats 300, and each charging seat 300 is configured to allow plug-in charging of the electric vehicle 200. The charging system 1 of the first embodiment includes three charging seats 300. A charging seat 300 is provided for each parking space 400. In this regard, the number of charging seats 300 included in the charging system 1 is not limited to three. The number of charging seats 300 included in the charging system 1 may be one, two, four or more. The charging seat 300 corresponds to the "charging device" according to the present disclosure.

[0022] The charging seat 300 is configured to be able to be raised and lowered (moved in the vertical direction) between a "stored state" and an "exposed state". In the "stored state", the charging seat 300 is stored underground, and in the "exposed state", the charging seat 300 is exposed above the ground. In the stored state, the charging seat 300 is lowered so that its upper end is at substantially the same level as the ground. In the exposed state, the charging seat 300 is raised so that its upper end is at a predetermined level above the ground.

[0023] The charging system 1 further includes an exhaust heat pipe 500 ( Figure 2 ) and a heat utilization device 600. The exhaust heat pipe 500 is provided below the ground. The exhaust heat pipe 500 is positioned along the line of the charging seats 300. That is, the charging seats 300 are installed above the exhaust heat pipe 500 provided below the ground. Like the charging seats 300, the heat utilization device 600 is also installed above the exhaust heat pipe 500. The exhaust heat pipe 500 and the heat utilization device 600 will be described in detail later.

[0024] Figure 2 is a cross-sectional perspective view of the charging system 1 according to the first embodiment. In Figure 2 , as Figure 1 shown, three charging seats 300 are provided. In Figure 2 , the charging seat 300 located on the left among the three charging seats 300 is in the exposed state. In Figure 2 , the charging seats 300 located in the middle and on the right among the three charging seats 300 are in the stored state.

[0025] For example, each charging stand 300 has a cylindrical housing. A recess is formed in the ground, and each charging stand 300 is fixed to a heat exhaust pipe 500 disposed underground at the bottom of the corresponding recess. Each of the recesses is formed to have a predetermined gap between the recess and the outer peripheral surface of the housing of the corresponding charging stand 300. The depth of the recess is substantially equal to the length of the charging stand 300 measured in the vertical direction in the stored state.

[0026] The charging stand 300 includes a movable part 301 and a fixed part 302. A storage space 305 for storing the connector 303 is formed in the upper part of the movable part 301. One end of a cable 304 is connected to the connector 303. The other end of the cable 304 is connected to a power supply circuit 307. The power supply circuit 307 includes a power conversion circuit (not shown) and is configured to supply power to the movable part 301 (more specifically, the connector 303 and the cable 304) when alternating current (AC) power is supplied to it from a power supply (not shown). The power supplied from the power supply circuit 307 to the movable part 301 may be AC power or direct current (DC) power. The power supply is, for example, an alternating current (AC) power supply composed of a commercial power supply or the like.

[0027] The cable 304 has an extensible part formed with a coiled part or a structurally extensible part having a tightening structure. The cable 304 is configured to be able to extend to an entrance (not shown) of an electric vehicle 200 parked in a parking space 400 ( Figure 1 ) when the connector 303 is taken out.

[0028] An opening 320 is provided in the upper surface of the movable part 301. The opening 320 is provided with a filter 321 for suppressing or preventing foreign matter from entering the charging stand 300. With this arrangement, foreign matter can be prevented from entering the interior of the charging stand 300.

[0029] The fixed part 302 includes a lifting device (not shown) for raising and lowering the movable part 301 in the vertical direction, the power supply circuit 307 as described above, a controller 308 for controlling the operation of the lifting device, a movement amount sensor (not shown), and a cooling fan 310. Similar to the movable part 301, an opening 325 is provided in the upper surface of the fixed part 302. In the first embodiment, no filter for preventing foreign matter from entering is provided in the opening 325. However, similar to the opening 320, a filter may also be provided in the opening 325. Therefore, foreign matter can be further prevented from entering the interior of the fixed part 302. The opening 320 and the opening 325 correspond to an example of the "air inlet" according to the present disclosure.

[0030] The lifting device includes an actuator (not shown) that raises and lowers the movable part 301. The lifting device raises and lowers the movable part 301 between a storage state and an exposed state. The lifting device can adopt various mechanisms. More specifically, the lifting device can have a rack and pinion type mechanism, a mechanism using a hydraulic cylinder, or a magnetic mechanism. The rack and pinion type mechanism raises and lowers the movable part 301 by rotating a pinion that meshes with a rack fixed to the movable part 301 using an electric actuator. The mechanism using a hydraulic cylinder raises and lowers the movable part 301 by fixing a rod connected to a piston to the movable part 301 and increasing and decreasing the hydraulic pressure supplied to a cylinder body fixed to the fixed part 302. The magnetic mechanism raises and lowers the movable part 301 by generating a repulsive force between the movable part 301 and the fixed part 302 using magnetic force.

[0031] The lifting device is configured to prevent the movable part 301 from descending beyond a position corresponding to the storage state by means of a stopper mechanism or the like. The lifting device is also configured to prevent the movable part 301 from being raised beyond a position corresponding to the exposed state.

[0032] The movement amount sensor detects the movement amount of the movable part 301. For example, the movement amount sensor detects the amount of lifting and lowering of the movable part 301 by the lifting device as the movement amount of the movable part 301. The movement amount sensor sends a signal indicating the detected movement amount of the movable part 301 to the controller 308. The movement amount sensor can detect a state amount equivalent to the lifting amount, such as the operation amount of the actuator, and the controller 308 can obtain the lifting amount from the detected state amount.

[0033] The controller 308 includes a central processing unit (CPU) (not shown), a memory (not shown) composed of a read only memory (ROM) and a random access memory (RAM), etc., and a communication unit (not shown) that can communicate with external devices. The communication unit is configured to be able to transmit various types of information, etc., to the external devices of the charging dock 300. The communication unit is configured to be able to communicate with, for example, a communication device (not shown) of an electric vehicle 200 that charges a battery using the charging dock 300, a communication terminal (not shown) owned by the user of the electric vehicle 200, a management server (not shown) that manages the charging dock 300, and / or another charging dock or multiple charging docks 300. The controller 308 controls electrical devices (e.g., the lifting device, the power supply circuit 307, and the cooling fan 310) provided in the charging dock 300 based on information stored in the memory, information received via the communication unit, and / or information obtained from sensors (not shown). The configuration for performing these controls is not limited to a configuration in which software processing is executed by the CPU, but can be a configuration composed of dedicated hardware (electronic circuits).

[0034] The heat discharge port 330 is provided at the bottom of the fixed part 302. In addition, the openings 510 are provided in the heat discharge pipe 500 at a given interval. In the first embodiment, three openings 510 are provided in the heat discharge pipe 500. The heat discharge port 330 provided at the bottom of the fixed part 302 is connected to a corresponding one of the openings 510 provided in the heat discharge pipe 500.

[0035] The cooling fan 310 receives power, for example, from the power supply circuit 307 and is driven according to a control signal from the controller 308. The cooling fan 310 is an intake type fan. More specifically, the cooling fan 310 is configured to feed external air (cooling air) in the direction from the opening 320 to the heat discharge port 330. When the cooling fan 310 is driven, the external air (cooling air) is sucked into the charging stand 300 through the opening 320, as Figure 2 shown by the arrow AR1 in. The cooling air sucked into the charging stand 300 flows toward the heat discharge port 330. Various devices including the power supply circuit 307 and the controller 308 are located on the path from the opening 320 to the heat discharge port 330. The cooling air cools the power supply circuit 307, the controller 308, etc. by exchanging heat with various devices including the power supply circuit 307 and the controller 308 located on the above path. The cooling air whose temperature has been raised through heat exchange is discharged into the heat discharge pipe 500 via the heat discharge port 330 and the corresponding opening 510. In the following description, the cooling air discharged from the heat discharge port 330 will also be referred to as "heat discharge air".

[0036] When a predetermined condition is satisfied, the controller 308 causes the cooling fan 310 to be driven. As the predetermined condition, (1) the condition that "the charging stand 300 is in use", (2) the condition that "a predetermined time has not elapsed since the charging stand 300 was used", or (3) the condition that "the charging stand 300 is in use, or a predetermined time has not elapsed since the charging stand 300 was used" can be adopted. For example, when the connector 303 is connected to the inlet of the electric vehicle 200 and power is supplied from the charging stand 3 to the electric vehicle 200, the charging stand 300 is in use. The predetermined time is set to the time length required to lower the temperature of the power supply circuit 307 to a level lower than a given temperature. The predetermined time is set based on, for example, the charging power supplied from the charging stand 300 to the electric vehicle 200, the power supply time, the cooling capacity of the cooling fan 310, the external air temperature, etc. The predetermined time can be set in advance based on the results of experiments or simulations. In addition, the condition that "the temperature of the power supply circuit 307 is equal to or higher than the threshold temperature" can be adopted as the predetermined condition. In this case, the fixed part 302 further includes a temperature sensor that detects the temperature of the power supply circuit 307 and outputs the detection result to the controller 308.

[0037] The heat discharge air discharged into the heat discharge pipe 500 through the opening 510 is fromFigure 2 flows from the left (upstream) side to the right (downstream) side in [reference] as shown by arrow AR2. The flow of the exhaust heat air from upstream to downstream can be achieved by the opening 510 and the structure around the opening 510. More specifically, for example, a shielding plate (baffle plate) having a check valve structure may be provided in the upstream section of the exhaust heat pipe 500 so that the exhaust heat air can flow from upstream to downstream while suppressing the flow of the exhaust heat air from downstream to upstream. In addition, the flow of the exhaust heat air from upstream to downstream can be achieved by providing a fan or a blower inside the exhaust heat pipe 500. In [reference] Figure 2 the arrow AR3 indicates the total flow rate of the exhaust heat air.

[0038] The opening 520 is provided in the downstream section of the exhaust heat pipe 500. In the exhaust heat pipe 500, the opening 520 is located downstream of the opening 510 to which the exhaust heat port 330 of the charging stand 300 is connected. The heat utilization device 600 is connected to the opening 520. The heat utilization device 600 according to this embodiment is a temperature raising device for raising the temperature of the battery 220 of the electric vehicle 200 by using the exhaust heat air discharged from each charging stand 300. The heat utilization device 600 includes an inlet 610 and an outlet 620. As shown by arrow AR4, the heat utilization device 600 sucks the exhaust heat air flowing in the exhaust heat pipe 500 from the inlet 610. Then, the heat utilization device 600 discharges the sucked exhaust heat air from the outlet 620. The heat utilization device 600 may include a device for further raising the temperature of the exhaust heat air sucked from the inlet 610.

[0039] The battery 220 of the electric vehicle 200 is located on the lower surface of a floor panel (not shown). For example, the electric vehicle 200 is parked above the heat utilization device 600 so that the temperature of the battery 220 can be raised by the exhaust heat air discharged from the outlet 620 of the heat utilization device 600. For example, when the battery 220 is at a low temperature level when starting to use the electric vehicle 200, it is effective to use the heat utilization device 600.

[0040] As described above, each of the charging bases 300 included in the charging system 1 of the first embodiment has an opening 320 and a heat exhaust port 330. The heat exhaust pipe 500 is disposed below the ground, and the heat exhaust port 330 of the charging base 300 is connected to the corresponding opening 510 of the heat exhaust pipe 500. When the cooling fan 310 is driven under the control of the controller 308 of the charging base 300, cooling air is sucked into the charging base 300 through the opening 320. The cooling air exchanges heat with various devices including the power circuit 307 and the controller 308 of the charging base 300. As a result, the devices including the power circuit 307 and the controller 308 are cooled. The cooling air (heat exhaust air) that has exchanged heat with various devices including the power circuit 307 and the controller 308 is discharged into the heat exhaust pipe 500 through the heat exhaust port 330. The charging base 300 is stored below the ground after being used to charge the battery 220 of the electric vehicle 200; therefore, heat generated during charging is likely to be trapped. In particular, the amount of heat generated by the power circuit 307 is large, so it is important to appropriately cool the power circuit 307. As described above, the heat exhaust pipe 500 is disposed below the ground, and the cooling air sucked in through the opening 320 of the charging base 300 is discharged into the heat exhaust pipe 500 through the heat exhaust port 330, so that the power circuit 307 included in the charging base 300 can be appropriately cooled. With the configuration of the charging system 1 according to the first embodiment, the power circuit 307 can be appropriately cooled even when the charging base 300 is in the storage state. For example, even if the charging base 300 is placed in the storage state immediately after being used to charge the battery 220 of the electric vehicle 200, the power circuit 307 can be cooled, and heat is less likely or impossible to be trapped inside the charging base 300. That is, the heat dissipation of the charging base 300 can be enhanced.

[0041] In addition, the charging system 1 is provided with a heat utilization device 600. The heat utilization device 600 is connected to an opening 520 disposed downstream of the opening 510 to which the heat exhaust port 330 of the charging base 300 is connected. The heat utilization device 600 sucks the heat exhaust air discharged from the heat exhaust port 330 of the charging base 300 into the heat exhaust pipe 500 and raises the temperature of the battery 220 of the electric vehicle 200 parked above the heat utilization device 600. Therefore, in the charging system 1, the heat exhaust generated by cooling the charging base 300 can be effectively utilized.

[0042] Second Embodiment

[0043] Figure 3 is a cross-sectional perspective view of a charging system 1A according to the second embodiment. The charging system 1A of the second embodiment includes three charging bases 300A, a heat exhaust pipe 500, and a heat utilization device 600.

[0044] The charging stand 300A is different from the charging stand 300 of the first embodiment in that a heat sink 315 is provided to replace the cooling fan 310. In addition, the charging stand 300A is different from the charging stand 300 in that the opening 320, the filter 321, and the opening 325 are deleted. Other configurations of the charging stand 300A are similar to those of the charging stand 300 of the first embodiment; thus, the description of other configurations will not be repeated.

[0045] The heat sink 315 is attached to the power circuit 307. The heat sink 315 is configured to transfer the heat of the power circuit 307. The power circuit 307 and the heat sink 315 are positioned such that a part of the heat sink 315 is exposed to the inside of the exhaust heat pipe 500 through the exhaust heat port 330 and the opening 510.

[0046] The fan 550 is provided in the upstream section of the exhaust heat pipe 500. The fan 550 is an intake type fan. When the fan 550 is driven, outside air (cooling air) is sucked into the exhaust heat pipe 500 from the outside of the exhaust heat pipe 500. The cooling air sucked into the exhaust heat pipe 500 flows from the upstream to the downstream as shown by the arrow AR10. The cooling air flowing inside the exhaust heat pipe 500 exchanges heat with the heat sink 315 that is partially exposed to the inside of the exhaust heat pipe 500 through the opening 510. As a result, the heat sink 315 is cooled, and the power circuit 307 that transfers heat to the heat sink 315 is also cooled.

[0047] In the same manner as in the first embodiment, the cooling air (exhaust heat air) whose temperature is raised by heat exchange with the heat sink 315 is utilized by the heat utilization device 600. At the same time, a blower can be used instead of the fan 550. The fan 550 corresponds to an example of the "blowing device" according to the present disclosure.

[0048] As described above, in the charging system 1A of the second embodiment, the heat sink 315 is attached to the power circuit 307. Then, the heat sink 315 is partially exposed to the inside of the exhaust heat pipe 500. In the exhaust heat pipe 500, the cooling air sucked into the exhaust heat pipe 500 by means of the fan 550 provided inside the exhaust heat pipe 500 flows from the upstream to the downstream. The cooling air sucked into the exhaust heat pipe 500 exchanges heat with the heat sink 315. As a result, the heat sink 315 can be cooled, and the power circuit 307 included in the charging stand 300A can be appropriately cooled. By using the configuration of the charging system 1A according to the second embodiment, it is also possible to make it less likely or impossible for heat to be trapped inside the charging stand 300A. That is, the heat dissipation of the charging stand 300A can be enhanced.

[0049] In addition, similar to the first embodiment, the heat utilization device 600 raises the temperature of the battery 220 of the electric vehicle 200 parked above the heat utilization device 600. That is, in the charging system 1A, the exhaust heat generated by the cooling of the charging stand 300A can also be effectively utilized.

[0050] Modification example

[0051] In the first and second embodiments, the heat utilization device 600 is a temperature raising device that raises the temperature of the battery 220 of the electric vehicle 200. However, the heat utilization device 600 is not limited to a temperature raising device for raising the temperature of the battery 220. For example, the heat utilization device 600 can be a warm air supply device that supplies warm air to a building. In this case, the outlet 620 of the heat utilization device 600 is connected to a duct through which air circulates in the building. In the same manner as in the first and second embodiments, the heat utilization device 600 inhales the exhaust heat air flowing in the exhaust heat pipe 500 and discharges it from the outlet 620. In this way, warm air can be supplied to the building.

[0052] The heat utilization device 600 can also be a snow melting device that melts the snow accumulated on the road. In this case, the outlet 620 of the heat utilization device 600 is connected to a duct provided under the road. In the same manner as in the first and second embodiments, the heat utilization device 600 inhales the exhaust heat air flowing in the exhaust heat pipe 500 and discharges it from the outlet 620. In this way, the exhaust heat air (warm air) is supplied to the duct provided under the road, and the warm air can melt the snow accumulated on the road.

[0053] The heat utilization device 600 can also be a conversion device that converts exhaust heat into electricity. For example, the conversion device generates a heat flow and converts heat into electricity. For example, the heat utilization device 600 can store the converted electricity in a power storage device or the like.

[0054] In the above three examples, the exhaust heat generated by the cooling in the charging stands 300 and 300A can also be effectively utilized.

[0055] The embodiments and modification examples disclosed herein should be considered illustrative in all respects and not restrictive. The scope of the present invention is indicated by the appended claims rather than the above description, and is intended to include all variations within the meaning and scope of the claims and their equivalents.

Claims

1. A charging system for charging a power storage device mounted on a vehicle, the charging system comprising: A charging device that is movable and configured to be switchable between a state where the charging device is stored underground and a state where the charging device is exposed above the ground; A discharge heat pipe disposed underground; And A heat utilization device connected to the discharge heat pipe and configured to utilize the discharged heat supplied from the discharge heat pipe, Wherein the charging device includes a connection device capable of being electrically connected to the power storage device, a power supply circuit configured to supply power to the connection device, and a discharge heat port connected to the discharge heat pipe, Wherein the heat utilization device includes an outlet, and the heat utilization device inhales the discharged heat air flowing in the discharge heat pipe and discharges the inhaled discharged heat air from the outlet, so as to raise the temperature of the battery of the electric vehicle by using the discharged heat air discharged from each charging device.

2. The charging system according to claim 1, wherein, The charging device further includes an air inlet and a cooling fan configured to inhale cooling air through the air inlet and feed the cooling air to the discharge heat port.

3. The charging system according to claim 2, wherein, The power supply circuit is located on a path where the cooling air flows from the air inlet to the discharge heat port.

4. The charging system according to claim 1, wherein: The discharge heat pipe includes a blowing device configured to cause the cooling air to flow in a direction from a connection point of the discharge heat pipe and the discharge heat port toward the heat utilization device; and The charging device further includes a heat sink attached to the power supply circuit, and at least a part of the heat sink is exposed to the discharge heat pipe through the discharge heat port.

5. A charging device that is movable and configured to be switchable between a state where the charging device is stored underground and a state where the charging device is exposed above the ground, the charging device comprising: A connection device capable of being electrically connected to a power storage device mounted on a vehicle; A power supply circuit configured to supply power to the connection device; And A discharge heat port, Wherein the discharge heat port is connected to a discharge heat pipe disposed underground, and a heat utilization device that utilizes the discharged heat supplied from the discharge heat pipe is connected to the discharge heat pipe, Wherein the heat utilization device includes an outlet, and the heat utilization device inhales the discharged heat air flowing in the discharge heat pipe and discharges the inhaled discharged heat air from the outlet, so as to raise the temperature of the battery of the electric vehicle by using the discharged heat air discharged from each charging device.

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