Charging pile with underground heat removal function

Abstract

The invention relates to a charging post (2) for charging an electric vehicle, having a charging interface (21) for coupling the electric vehicle and power electronics for providing a charging current and a charging voltage for the electric vehicle, the power electronics and / or other heat-generating components present in the charging post (2) being liquid-cooled, according to the invention, the heat of the power electronics and / or other heat-generating components is conducted away via a cooling line (7) into a region below the charging post (2), and said heat is dissipated in a heat exchanger (9) in this region to a liquid reservoir (10) having a liquid. The invention is characterized in that the liquid reservoir (10) is equipped with connecting means for connecting a further heat-generating device (19, 2), a further liquid reservoir (10) or a heat-absorbing device (19).

Description

Technical Field

[0001] The present invention relates to a charging station or charging pile for charging an electric vehicle The charging post has a charging interface for coupling (Ankoppeln) an electric vehicle and power electronics for providing a charging current and a charging voltage for the electric vehicle, wherein the power electronics and / or other heat-generating components present in the charging post are cooled by liquid, wherein the heat of the power electronics and / or other heat-generating components is conducted via cooling lines to an area below the charging post and dissipated in a heat exchanger in this area to a liquid reservoir containing liquid. Background Art

[0002] Such a charging post for charging electric vehicles is known from the publication DE 10 2018 103 706 A1. The publication proposes a charging post in which a cooling circuit for dissipating heat is connected to an underground coolant reservoir below the charging post, in which a coolant for cooling the power electronics of the charging post is stored. The coolant reservoir should have a minimum volume of the order of 200 liters or more. Water is preferably used as the refrigerant for cooling the power electronics. This arrangement in the soil has the advantage that, on the one hand, the coolant reservoir is protected from the influence of sunlight and therefore does not absorb heat from the outside, and on the other hand, the coolant reservoir can dissipate heat to the land around it. The cooling (or temperature control) effect of the soil can thus be utilized. Here, water is pumped from the coolant reservoir in the soil through the cooling circuit of the charging post by means of a pump. Summary of the invention

[0003] The object of the present invention is to provide a charging post for charging electric vehicles, which allows other devices to use the heat dissipated during the cooling process of the charging post.

[0004] According to the invention, this object is achieved by a charging post according to claim 1 and a combination comprising a charging post according to claim 7. Advantageous embodiments of the invention can be derived from the dependent claims, the description and the drawings.

[0005] In the charging post according to the invention, it is provided that the liquid reservoir is equipped with a drive device for connecting (anschluss) other heat-generating devices, other liquid reservoirs or heat-absorbing devices. In this way, the heat generated when the charging post is cooled can be conducted from the liquid reservoir to other devices via the liquid line and used there. Similarly, heat-absorbing components can also be connected via the connecting device, which thus contribute to cooling the liquid reservoir.

[0006] In a first embodiment of the invention, it is provided that the further heat generating devices are further charging posts. In this way, these charging posts can be connected to one another via a cooling liquid line network and heat can thus be conducted from the more heavily loaded charging posts to the less heavily loaded charging posts, and conversely, the liquid thus cooled can be conducted back to the more heavily loaded charging posts, thereby cooling the more heavily loaded charging posts more effectively than cooling can be done only with the help of the liquid reservoir of the relevant charging post. In this way, a cooling combination can be created when there are a plurality of charging posts on the site of a charging park.

[0007] In another embodiment of the present invention, the other heat generating components include a heat pump for heating a building. In this way, buildings near a charging park including a plurality of charging piles can be heated using the waste heat generated by these charging piles during the charging process. In particular, for charging parks arranged close to buildings, the waste heat of the charging piles can be reasonably used to heat nearby buildings.

[0008] In another embodiment of the present invention, the charging pile is connected to the heating network via a liquid pipeline and a heat exchanger. In this embodiment of the present invention, the charging pile can transfer its heat to the heating network (e.g., a remote heating network or a local heating network) via a liquid pipeline and a heat exchanger, so that buildings that are far away can also be heated with the waste heat of the charging pile. In particular, for larger charging parks with multiple charging piles, the large amount of waste heat generated can be reasonably fed into the heating network and used to heat buildings connected to the heating network.

[0009] It is preferably provided that the charging post has a housing and that an air / water heat exchanger is provided inside the housing, which collects heat from the ambient air and is connected to the cooling line of the charging post. In this way, hot air in and around the housing can be fed into the cooling circuit of the charging post via the air / water heat exchanger, and the air in or around the housing of the charging post can thereby also be cooled. Thus, not only can components that are liquid-cooled be connected to the cooling circuit, but also components that emit hot air can be cooled accordingly.

[0010] Furthermore, it is also possible to create a combined assembly with liquid cooling from a plurality of charging posts, wherein the liquid reservoirs of a plurality of charging posts are connected to one another in a star shape or a ring shape. In this way, heat exchange between the liquid cooling circuits of a plurality of charging posts can be created, which is particularly advantageous when a plurality of charging posts are used in a charging park.

[0011] Furthermore, it is provided that in the combined assembly of charging posts, the liquid used for cooling is distributed via liquid lines between the charging posts by means of pumps. The pumps ensure that the liquid circulates between the charging posts and thus efficiently and quickly transfers heat from the charging posts with higher loads to the charging posts with lower loads, and vice versa, cooler liquid is pumped back to the charging posts with higher loads in order to effectively cool them.

[0012] It is also preferably provided that in each liquid reservoir of the respective charging pile, the temperature of the liquid is detected by means of a sensor and taken into account when distributing the liquid via the liquid line by means of a pump. In this way, the heat distribution in the charging pile assembly can be intelligently controlled, since the liquid can be pumped in a targeted manner from the charging pile with a higher load to the charging pile with a lower load, wherein the temperature of the liquid reservoir of the respective charging pile is taken into account in each case. By means of such temperature detection, the thermal load of the respective charging pile can be effectively detected and can be adjusted accordingly by controlling the cooling circuit (via the liquid line and the correspondingly actuated pump).

[0013] It is also provided that, when the temperature in the liquid reservoir of a certain charging pile is too high, the liquid for cooling is pumped in greater quantities from other charging piles via liquid pipelines from other liquid reservoirs to the overheated charging pile. When the preset temperature is exceeded, the charging pile is considered to be overheated, and accordingly, the cooling liquid is pumped in greater quantities from other liquid reservoirs of other charging piles to the overheated charging pile, so that the overheated charging pile is cooled down to an allowable temperature, so that the charging power of the charging pile can be fully utilized again. For an overheated charging pile, the charging power must be reduced to avoid damage to the charging pile and the charging electronics contained inside the charging pile. Thus, by means of targeted cooling of such an overheated charging pile, the availability of a high-load charging pile can be increased and a reduction in power can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The invention is described and explained in more detail below with reference to two drawings. The drawings show:

[0015] Figure 1 : The structure of the charging pile according to the invention, which is attached to a heat pump for heating a building via a liquid line, and

[0016] Figure 2 : A plurality of charging piles according to the present invention are connected to each other via liquid pipelines to form a charging pile joint assembly and are additionally connected to a heat pump for heating a building. DETAILED DESCRIPTION

[0017] In accordance with Figure 1In a DC charging system of a charging post 2 with a housing 3 for charging electric vehicles connected via a plug 21, a plurality of power electronic components are implemented. In addition to magnetic components, losses occur in particular in power semiconductors, which must be conducted away to prevent overheating of sensitive components. For this purpose, the power semiconductors are mounted on cooling bodies 5, in which cooling coils 7 through which liquid flows are processed. These cooling coils 7 can either be guided sequentially through all heat sources in a series manner, or each heat source can be connected to a separate cooling coil 7.

[0018] One or more cooling water circuits in the cooling circuit are driven by a pump 8, so that water flows in the cooling coils 7. The heated water is finally cooled in a water / water heat exchanger 9. The heat exchanger 9 is placed in a closed liquid container 10. The liquid container 10 can be filled with water 11, a water-glycol mixture or another suitable liquid.

[0019] The liquid container 10 can simultaneously serve as a base for the charging post 2. This makes it possible to dispense with a concrete base. The charging post 2 is securely connected to the liquid container 10 or to the base via a suitable screw 12. Furthermore, the water circuit 7 of the charging post 2 is connected to the heat exchanger 9 in the water container 10 by means of a liquid adapter 13. The water container 10 can also be placed separately in the ground or outside the ground.

[0020] In another configuration, multiple charging piles 2 can share a water container. Inside the charging pile 2, the water circuit 7 can be connected or disconnected when necessary with the help of a controllable valve 14, and the cooling can be controlled as needed. This control of the valve 14 as needed is carried out by the intelligent control electronics 15 inside the charging pile 2. The control electronics 15 for thermal management calculates the optimal control of the valve 14 and the liquid flow required for the appropriate speed of the water pump 8 from measured values ​​(such as the temperature of the cooling body, the temperature of the liquid in the water container 10 and the temperature inside the charging pile 2). As a result, thermal management is optimized in terms of cooling effect and the energy consumption of the cooling device is minimized.

[0021] In addition to the losses of power electronics, other heat generating systems (such as control computers 15, current-carrying high-current lines, fuses, display elements, etc.) are installed in the charging pile 2, and the heat input of these heat generating systems cannot be directed away in a targeted manner. The heat input from sunlight and the above-mentioned loss sources may also heat the interior space of the housing 3 and cause the electronic components to shut down. Therefore, an air / water heat exchanger 16 can be arranged inside the housing 3, which collects heat from the ambient air and introduces the heat into the connected cooling circuit 7. The water container 10 is designed so that the lost heat energy generated during multiple charging processes does not cause the liquid to become overheated and lose its cooling effect. The water container 10 can have an insulation part 18 to minimize the heat dissipation to the ground. If the waste heat of the water container is to be used for other equipment (such as a heat pump 19), it makes sense to use an insulation part.

[0022] The thermal storage capacity of water or other liquid used is used to absorb, disperse or mix short-term energy.

[0023] An example calculation is as follows:

[0024] 200kW charging station - about 98% efficiency

[0025] Power consumption: 4000W

[0026] 1000 liter water tank

[0027] Initial temperature 20℃, final temperature 80℃

[0028] Energy required: 70kWh

[0029] The electric vehicle can be charged for 17.5 hours in continuous operation at a charging power of 200 kW before the maximum fluid temperature is reached.

[0030] However, in the long run, the thermal energy must be released again, since after each charging process the temperature of the liquid rises further, see the calculation example above. The energy release or cooling of the water reservoir can be carried out in the following way. The surface of the water container 10 is designed so that heat can be released to the surrounding land. To this end, the liquid container 10 is designed so that the contact area between the container surface and the surrounding land is as large as possible. To this end, the water container 10 can be implemented in a rib-like (gerippt), in a cylindrical shape, wherein the diameter preferably corresponds to the height, or the water container 10 can have a metal flange for increasing the surface. In order to make full use of the stored thermal energy, in another configuration, the liquid container 10 is thermally insulated. The advantage of this solution is the rational use of the generated heat and the improvement of the overall efficiency thereby.

[0031] like Figure 2As shown, the stored waste heat can be extracted by an additional heat exchanger (such as a heat pump 19) in order to heat domestic water or heating water for heating. In this way, in a charging park with multiple charging piles 2, hot water and heating can be provided to, for example, toilet cabins without further infrastructure. In charging parks with infrastructure (such as rest stops), the stored thermal energy is integrated into the entire system, which can be used to heat restaurants, kiosks, etc. Via the liquid pipeline 20, multiple charging piles 2 can be connected to each other in a ring or star shape. Similarly, the heat pump 19 can also be attached via the liquid pipeline 20.

[0032] Reference numerals list

[0033] 1 Buildings

[0034] 2 Charging stations

[0035] 3 Housing

[0036] 5Cooling bodies for power electronics

[0037] 7 Cooling coil

[0038] 8 Pumps

[0039] 9 Water / Water-Heat Exchanger

[0040] 10 Liquid Container

[0041] 11 Liquid

[0042] 12 Screw-on parts of housing

[0043] 13 Liquid Adapter

[0044] 14 valve

[0045] 15 Control electronics

[0046] 16 Air / water heat exchanger

[0047] 18 Isolation Department

[0048] 19 Heat Pump

[0049] 20 Liquid pipeline

[0050] 21 Plug

Claims

1. A charging pile (2) for charging an electric vehicle, the charging pile comprising: a charging interface (21), the charging interface being used to couple to the electric vehicle; and a power electronic device, the power electronic device providing a charging current and a charging voltage for the electric vehicle, in, The power electronic device and / or other heat generating components in the charging pile (2) are cooled by liquid. The heat of the power electronic device and / or other heat-generating components is conducted to the area below the charging post (2) via a cooling line (7), and the heat is dissipated in this area in a heat exchanger (9) to a liquid reservoir (10) containing a liquid. It is characterized in that The liquid storage device (10) is equipped with a connection device for connecting other heat-generating devices (19, 2), other liquid storage devices (10) or heat-absorbing devices (19).

2. The charging pile (2) according to claim 1, It is characterized in that The other heating devices are other charging piles (2).

3. The charging pile (2) according to claim 1 or 2, It is characterized in that The other heat absorbing equipment comprises a heat pump (19) for heating the building (1).

4. The charging post (2) according to any one of claims 1 to 3, It is characterized in that The charging post (2) is connected to the heating network via a liquid pipeline (20) and a heat exchanger.

5. The charging post (2) according to any one of the preceding claims, It is characterized in that The liquid container (10) is filled with water or a water-glycol mixture.

6. The charging post (2) according to any one of the preceding claims, It is characterized in that The charging pile (2) has a housing (3), and An air / water heat exchanger (16) is arranged inside the housing (3), the air / water heat exchanger collects heat from the surrounding air, and the air / water heat exchanger is connected to a cooling pipeline (7) of the charging pile (2).

7. A combined assembly comprising a charging post (2) according to any one of the preceding claims, It is characterized in that The combined assembly comprises a plurality of charging posts (2) which are connected to one another via liquid lines (20) which are designed in a ring or star shape.

8. The combined assembly according to claim 7, It is characterized in that Liquid used for cooling is distributed via a liquid pipeline (20) between the charging posts (2) by means of a pump (8).

9. A combined assembly according to claim 7 or 8, It is characterized in that In each liquid reservoir (10) of the corresponding charging post (2), the temperature of the liquid is detected by a sensor and taken into account when dispensing the liquid via the liquid line (20) by means of the pump (8).

10. A combined assembly according to any one of claims 7 to 9, It is characterized in that When the temperature in the liquid storage tank (10) of a charging pile (2) is too high, liquid for cooling is pumped from other charging piles (2) via the liquid pipeline (20) from other liquid storage tanks (10) to the overheated charging pile (2).

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