Charging equipment for charging an electric vehicle and the use of a charging equipment

Abstract

The invention relates to a charging device for charging an electric vehicle according to the preamble of claim 1. The invention further relates to the use of such a charging device. The use of a charging device is also proposed.

Description

[0001] The invention relates to a charging device for charging an electric vehicle according to the preamble of claim 1. Furthermore, the invention relates to the use of such a charging device.

[0002] Common charging stations for electric vehicles are designed to be grid-dependent and use, for example, a 400-volt three-phase connection to charge smaller electric vehicles. High-performance charging points are also known, but these also require a high-performance grid connection to be able to provide corresponding charging power of, for example, up to 240 kW directly and continuously.

[0003] The object of the invention is to improve the state of the art.

[0004] The object is achieved by a charging device for charging an electric vehicle according to claim 1. Advantageous embodiments of the invention are described in the dependent claims 2 to 7.

[0005] A key concept of the invention is that the charging connection for charging an electric vehicle is designed as a direct current charging connection and is fed directly from a direct current energy storage device, for example a battery. This avoids the need for a corresponding mains power supply to be sufficiently powerful to provide the corresponding charging power. According to a further key concept of the invention, the charging power can thus be fed from the direct current energy storage device, whereby the corresponding direct current energy storage device can be charged from the available mains power, for example, over a longer period of time. In this way, for example, a charging device according to the invention can also be connected to and operated on poorly developed mains power supplies and / or, for example, low-performance mains power supplies.This avoids high expansion costs and complex electrical connections.

[0006] Using an inverter, for example, energy available from the DC energy storage system can be fed back into the grid, thus cushioning grid peaks. It is also possible to use another AC power source, such as a solar array and / or a wind turbine, to charge the DC energy storage system. In this case, the inverter can be a hybrid inverter and / or a rectifier already installed for the DC energy storage system.

[0007] In particular, the mains power output with the charging device according to the invention can be, for example, a maximum of 10 kW, a maximum of 6 kW, a maximum of 3.6 kW and / or a maximum of 1 kW.

[0008] Likewise, the available charging power can be a maximum of 40 kW, a maximum of 60 kW, a maximum of 120 kW, or a maximum of 240 kW. In particular, the charging power can be five times, ten times, or several times higher than the grid power.

[0009] The charging port can be designed as a charging station or, for example, as a so-called wall box, i.e., a local charging device mounted on a wall, with a dedicated connector for electric vehicles. The DC energy storage device can comprise a lithium-ion battery or, for example, a lithium iron phosphate battery.

[0010] In a further aspect, the object is achieved by the use of a charging device according to one of the embodiments described above and also in claims 1 to 7 for the decentralized charging of electric vehicles by means of a mains power supply, in particular by means of a comparatively weak mains power supply.

[0011] The invention is explained below using exemplary embodiments. Fig. 1 a schematic representation of a charging device as a principle sketch and Fig. 2 a portable power supply with an analogue functional principle of the charging device of the Fig. 1.

[0012] A charging device 101, which is arranged as part of a building, for example a residential building or a commercial or industrial property (not shown), has a mains connection 103. The mains connection 103 is designed, for example, as a 400 volt three-phase house supply. The mains connection 103 is routed through a house wall (not shown) by means of a house connection 105. From the house connection 105, the correspondingly provided alternating voltage is routed via a connecting cable 107 and a subsequent charging cable 109 to a hybrid converter 131. The hybrid converter 131 can rectify the mains voltage provided by the house connection 105 and feed it into a battery 141, wherein the battery 141 is connected to the hybrid converter 131 by a battery cable 143.Likewise, the hybrid converter 131 can be used to feed the electrical power stored in the battery 141, present as direct current, back to the house connection 105 and, for example, also into the grid connection 103. For this purpose, the house connection 105 can also have a controller (not shown) that communicates with the hybrid converter 131 via a network (not shown).

[0013] A solar system 121 can be used to generate additional electrical power from sunlight. The solar system 121 is, for example, located on the roof of a house (not shown). By means of a PV converter 123, which can also communicate with the hybrid converter 131 and the house connection 105 via the network, additional AC power can be provided in the direction of the connection line 107, so that the electrical power generated by the solar system 121 can be used to both charge the battery 141 and feed electrical power back into the grid connection 103. The battery 141 is designed as a lithium-ion storage device and, in the example shown, has a storage capacity of 250 kWh.

[0014] By means of a charging cable 157, direct current electrical power can be fed directly from the battery 141 to a charging point 151. The charging point 151 is located, for example, on an exterior wall of the house (not shown) and is used to charge an electric vehicle. For this purpose, the charging point 151 has a connecting cable 153 and a charging plug 155. The charging plug 155 can be connected to the electric vehicle (not shown), for example, in the form of a standard charging plug for direct current charging.

[0015] It should be noted here that the charging point 151 is connected directly to the charging point 151 via a direct DC voltage connection. As a result, despite a grid connection line 103 providing only 20 kW, a charging power of, for example, 60 kW can still be provided at the charging point 151 by means of the interposed battery 141, by charging the battery 151 with the available charging power at the time and still being able to deliver a correspondingly high power when charging an electric vehicle.

[0016] A power supply 201 is constructed analogously to the previously described charging device 101, with the power supply 201 forming a self-sufficient power supply for charging electric vehicles. The power supply 201 has a housing 202 with pallet feet 204, so that the power supply 201 can be transported, for example, on a pallet fork using a forklift or a front loader. For example, the power supply 201 serves to provide a charging point for an electric vehicle in a disaster area or as part of a temporary facility such as a trade fair or exhibition, despite weak available electrical grid power.

[0017] Within the housing 201, the mains voltage provided from a connecting line 203 is converted into a direct voltage in a rectifier 205 and provided as charging power for a battery 241 via a battery line 207. The battery 241 is constructed analogously to the battery 141 described above. It should be noted here that the rectifier 205 can also be designed as a hybrid converter, so that, for example, electrical power stored in the battery 241 can be fed back into the connecting line 203 and thus into the mains voltage supply by means of an inverter.

[0018] By means of a charging line 257, the DC voltage from the battery 241 can be conducted to a charging box 251, wherein the charging box 251 is arranged on one side of the housing 202 and is accessible from the outside. Analogous to the previous example, the charging box 251 has a connecting cable 253 and a charging plug 255 for connecting an electric vehicle (not shown). List of reference symbols 101 Charging device 103 Mains connection 105 house connection 107 connecting cable 109 Charging cable 121 solar system 123 PV inverters 131 hybrid inverters 141 battery 143 Battery cable 151 charging points 153 connection cables 155 charging plugs 157 Charging cable 201 Power supply 202 housings 203 connecting cable 204 pallet foot 205 rectifiers 207 Battery cable 241 battery 251 Charging box 253 connection cables 255 charging plugs 257 charging cable

Claims

[1] Charging device (101, 201) for charging an electric vehicle, wherein the charging device has a mains power supply (103, 203) with an available mains power, an electrical energy storage device (141, 241) and a charging connection (151, 251) with an available charging power, wherein the mains power supply (103, 203) is arranged on the mains side, the electrical energy storage device (141, 241) is designed as a direct current energy storage device and can be charged by rectifying an alternating voltage of the mains power supply (103, 203), and the charging connection (151, 251) is arranged on the charging side and can be electrically connected to the electric vehicle for charging the electric vehicle with the available charging power, characterized byin that the charging connection (151, 251) is a direct current charging connection, is connected to a direct voltage taken from the direct current energy storage device (141, 241) and is electrically fed from the direct current energy storage device (141, 241), wherein the charging of the electric vehicle with the available charging power from an energy reserve of the direct current energy storage device (141, 241) takes place independently of the available mains power of the mains power supply (103, 203). [2] Charging device according to claim 1, characterized byin that the direct current energy storage device (141, 241) has an inverter (131) and an alternating current supply device, wherein an electrical alternating current consumer can be fed by means of the inverter (131) and the alternating current supply device using electrical energy taken from the direct current energy storage device (141, 241) and / or feeding electrical energy back into the mains power supply (103, 203) is possible by means of the inverter (131) and the alternating current supply device. [3] Charging device according to claim 1 or 2, characterized by that the electrical direct current energy storage device (141, 241) can be charged by means of a further alternating current source electrically connected to the inverter (131), for example its solar system (121) and / or a wind power plant. [4] Charging device according to one of the preceding claims, characterized bythat the mains power output is maximum 10kW, maximum 6kW, maximum 3.6kW and / or maximum 1kW. [5] Charging device according to one of the preceding claims, characterized by that the available charging power is a maximum of 40kW, a maximum of 60kW, a maximum of 120kW or a maximum of 240kW, whereby in particular the charging power is 5 times, 10 times and / or 20 times the grid power. [6] Charging device according to one of the preceding claims, characterized by that the charging connection (151, 251) has a charging station (151) with a connection plug (155) for electric vehicles. [7] Charging device according to one of the preceding claims, characterized by that the direct current energy storage device (141, 241) comprises a lithium-ion battery and / or a lithium iron phosphate battery. [8] Use of a charging device (101, 201) according to one of the preceding claims 1 to 7 for decentralized charging of electric vehicles by means of a mains power supply (103, 203).

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