KR-20260063533-A - ELECTRIC VEHICLE CHARGING SYSTEM FOR MEGAWATT-LEVEL AND FAST CHARGING

KR20260063533AKR 20260063533 AKR20260063533 AKR 20260063533AKR-20260063533-A

Abstract

An electric vehicle charging system according to one embodiment of the present invention comprises a plurality of electric vehicle charging devices and a control unit for controlling each electric vehicle charging device, wherein each electric vehicle charging device comprises: a charging connection unit connected to an electric vehicle; an output terminal for outputting power to the charging connection unit; a plurality of power modules electrically connected to the output terminal and supplying power to the output terminal; an energy storage device having a DC/DC converter electrically connected to the output terminal and supplying power to the output terminal using stored energy; a power switching unit for electrically connecting or disconnecting a grid to each of the plurality of power modules; and an output switching unit for electrically connecting or disconnecting the output terminal to each of the plurality of power modules and the energy storage device. The electric vehicle charging system includes a driving switching unit that electrically connects or disconnects the output terminal and the charging connection unit to supply or cut off power to the charging connection unit, and the electric vehicle charging system further includes an MCS switching unit that electrically connects or disconnects the output terminals of each electric vehicle charging device to each other, and the control unit is characterized by performing charging of the electric vehicle using at least one of the first electric vehicle charging device and the second electric vehicle charging device according to the required output capacity and required charging amount of the electric vehicle when the electric vehicle is connected to the first charging connection unit of the first electric vehicle charging device among the plurality of electric vehicle charging devices.

Inventors

조태석
이근택
김성진
김태원

Assignees

채비(주)

Dates

Publication Date: 20260507
Application Date: 20241030

Claims (10)

In an electric vehicle charging system comprising a plurality of electric vehicle charging devices and a control unit for controlling each electric vehicle charging device, Each of the above electric vehicle charging devices is, Charging connection part connected to an electric vehicle; An output terminal that outputs power to the above-mentioned charging connection; A plurality of power modules electrically connected to the output terminal and supplying power to the output terminal; An energy storage device equipped with a DC/DC converter electrically connected to the output terminal and supplying power to the output terminal using stored energy; A power switching unit that electrically connects or disconnects the system and each of the plurality of power modules; An output switching unit that electrically connects or disconnects the above output terminal, each of a plurality of power modules, and an energy storage device; and It includes a driving switching unit that electrically connects or disconnects the output terminal and the charging connection unit to supply or cut off power to the charging connection unit, and The above electric vehicle charging system is, It further includes an MCS switching unit that electrically connects or disconnects between the output terminals of each electric vehicle charging device, The above control unit is, An electric vehicle charging system characterized by, when an electric vehicle is connected to a first charging connection part of a first electric vehicle charging device among the plurality of electric vehicle charging devices, charging of the electric vehicle is performed using at least one of the first electric vehicle charging device and the second electric vehicle charging device according to the required output capacity and required charging amount of the electric vehicle.
In paragraph 1, The above-mentioned second electric vehicle charging device is an electric vehicle charging system characterized by selecting at least one electric vehicle charging device among a plurality of electric vehicle charging devices in which an electric vehicle is not connected to the charging connection part.
In paragraph 2, An electric vehicle charging system characterized in that the second electric vehicle charging device is selected in an order adjacent to the first electric vehicle charging device among a plurality of electric vehicle charging devices in which an electric vehicle is not connected to the charging connection part.
In paragraph 1, The above control unit is, An electric vehicle charging system characterized by, when the above-mentioned required output capacity is smaller than the sum of the output capacities of a plurality of first power modules of the first electric vehicle charging device, selecting a number of first power modules corresponding to the above-mentioned required output capacity among the plurality of first power modules as driving power modules, and operating a first power switching unit, a first output switching unit, and a first driving switching unit of the first electric vehicle charging device to electrically connect each driving power module to a grid and a first charging connection unit.
In paragraph 1, The above control unit is, If the above-mentioned required output capacity exceeds the sum of the output capacities of a plurality of first power modules of the first electric vehicle charging device, determine whether the first excess output capacity, which is the sum of the output capacities of the plurality of first power modules subtracted from the above-mentioned required output capacity, exceeds the output capacity of the first energy storage device of the first electric vehicle charging device, and If the above first excess output capacity does not exceed the output capacity of the above first energy storage device, each of the plurality of first power modules is selected as a driving power module, and the above first energy storage device is selected as a driving energy storage device. The first power switching unit of the first electric vehicle charging device is operated to electrically connect each driving power module to the grid, and An electric vehicle charging system characterized by operating the first output switching unit and the first driving switching unit of the first electric vehicle charging device to electrically connect the driving power module and the driving energy storage device, respectively, to the first charging connection unit.
In paragraph 5, The above control unit is, An electric vehicle charging system characterized by selecting, as driving power modules, a number of second power modules of the second electric vehicle charging device corresponding to the second excess output capacity (excluding the output capacity of the first electric vehicle charging device from the first excess output capacity) when the first excess output capacity exceeds the output capacity of the first energy storage device.
In paragraph 6, The above control unit is, An electric vehicle charging system characterized by operating the MCS switching unit to electrically connect the first output terminal of the first electric vehicle charging device and the second output terminal of the second electric vehicle charging device, and operating the second power switching unit and the second output switching unit of the second electric vehicle charging device to output the power of each driving power module to the first output terminal.
In paragraph 6, The above second excess output capacity is, If the charge amount of the first energy storage device is smaller than the shared charge amount obtained by dividing the required charge amount by the number of driving power modules and driving energy storage devices, it is equal to the first excess output capacity, and An electric vehicle charging system characterized in that, when the charging amount of the first energy storage device is greater than the shared charging amount, the value is the sum of the output capacities of the plurality of first power modules and the output capacity of the first energy storage device from the required output capacity.
In paragraph 1, Each of the above electric vehicle charging devices is, An electric vehicle charging system characterized by further including a solar module positioned at the top to produce energy and transfer the produced energy to the energy storage device.
In paragraph 1, The above control unit is, Select the first energy storage device of the first electric vehicle charging device and the second energy storage device of the second electric vehicle charging device according to the above required output capacity, and if the charging amount of each of the selected first energy storage device and the second energy storage device is greater than the shared charging amount obtained by dividing the above required charging amount by the number of first energy storage devices and the second energy storage devices, select the selected first energy storage device and the second energy storage device as driving energy storage devices. An electric vehicle charging system characterized by operating the MCS switching unit to electrically connect the first output terminal of the first electric vehicle charging device and the second output terminal of the second electric vehicle charging device, and operating the first output switching unit and the first driving switching of the first electric vehicle charging device and the second output switching unit of the second electric vehicle charging device to supply power from the driving energy storage devices to the first charging connection unit.

Description

Electric Vehicle Charging System for Megawatt-Level and Fast Charging The present invention relates to an electric vehicle charging system for megawatt-class charging and rapid charging. Recently, as air pollution caused by the depletion and overuse of fossil fuels has emerged as a serious problem, research and development on the use of renewable energy and eco-friendly transportation methods are actively underway. Among these eco-friendly modes of transportation, electric vehicles, in particular, are launching into the market by automakers worldwide in rapid succession because they produce no noise pollution during operation and do not emit air pollutants. In line with this trend, significant efforts are being made to develop and install electric vehicle charging systems to facilitate the widespread adoption and use of eco-friendly electric vehicles. In particular, large commercial electric vehicles (electric trucks, electric buses, etc.) use high-capacity batteries, so a Megawatt Charging System (MCS) that provides megawatt (MW) power is required to enable charging within a short period of time. Conventionally, electric vehicle charging devices could not provide megawatt-scale power due to the output capacity limitations of the power modules that convert grid power. Accordingly, electric vehicle charging devices with maximized power module output capacity have been proposed. However, such charging devices suffered from poor compatibility, as they could not be used with commercial vehicles using standard batteries, unlike electric vehicles using large-capacity batteries. Furthermore, providing high-output power from individual modules resulted in excessive power conversion losses and caused defects due to excessive load on the modules. FIG. 1 is a drawing showing an electric vehicle charging system according to one embodiment of the present invention. FIG. 2 is a drawing showing the configuration of an electric vehicle charging device according to one embodiment of the present invention. Figure 3 is a diagram schematically showing the configuration of each of the multiple power modules. FIG. 4 is a drawing showing a first electric vehicle charging device in which an electric vehicle is connected to a first charging connection part according to an embodiment of the present invention, and a second electric vehicle charging device in which an electric vehicle is not connected to a second charging connection part. Figure 5 is an example showing the control unit selecting a second electric vehicle charging device. It should be noted that in assigning reference numbers to the components of each drawing in this specification, identical components are given the same number as much as possible, even if they are shown in different drawings. Meanwhile, the meaning of the terms described in this specification should be understood as follows. Singular expressions should be understood to include plural expressions unless the context clearly defines otherwise, and terms such as "first," "second," etc. are intended to distinguish one component from another, and the scope of rights should not be limited by these terms. Terms such as "include" or "have" should be understood as not excluding in advance the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. The term “at least one” should be understood to include all combinations that can be presented from one or more related items. For example, the meaning of “at least one of the first item, the second item and the third item” is not only the first item, the second item, or the third item individually, but also all combinations of items that can be presented from two or more of the first item, the second item, and the third item. Hereinafter, the present invention will be described in more detail with reference to the drawings. The electric vehicle charging system according to the present invention enables the implementation of a MegaWatt Charging System (MCS) and ultra-fast charging. FIG. 1 is a drawing showing an electric vehicle charging system according to an embodiment of the present invention. As shown in FIG. 1, the electric vehicle charging system according to the present invention includes a plurality of electric vehicle charging devices (100) and a control unit (500) that controls each electric vehicle charging device (100). A plurality of electric vehicle charging devices (100) can perform fast charging and slow charging according to the request of the electric vehicle. In addition, the electric vehicle charging device (100) according to the present invention can charge the electric vehicle with a megawatt-class output capacity according to the request of the electric vehicle. FIG. 2 is a diagram showing the configuration of an electric vehicle charging device (100) according to an embodiment of the present invention. As shown in FIG. 2, the electric vehicle charging device (100) according to th