Harging and discharging device for electric vehicle

Abstract

The electric vehicle charging and discharging device of the present invention is characterized by comprising: a charging and discharging connector electrically connected to an electric vehicle and supplying power for charging and discharging the electric vehicle; and a charging and discharging device that converts commercial power to supply to the charging and discharging connector to charge the electric vehicle, or transmits power discharged from the electric vehicle through the charging and discharging connector to a load.

Description

Technology Field

[0001] The present invention relates to an electric vehicle charging and discharging device. Background Technology

[0003] Electric vehicles utilize batteries as a power source and employ motors powered by battery electricity to generate the vehicle's driving force. In electric vehicles, the motor for propulsion operates when power is supplied from the battery. Furthermore, since the motor is connected to the wheels to transmit power, it can receive rotational force from the wheels during braking or coasting and function as a generator. While operating as a generator, it can convert the vehicle's kinetic energy into regenerative electrical energy and store it in the battery.

[0004] Generally, electric vehicles (EVs) utilize battery packs in the form of packages, and the EV battery system includes auxiliary devices in addition to the aforementioned battery packs. These auxiliary devices may include charging and discharging equipment for EV charging and discharging. Charging and discharging devices are provided separately according to their respective functions. For example, a slow charger is a device used to charge EVs in locations where commercial power can be easily supplied, such as residential or commercial buildings. The slow charger performs charging current setting and various protection functions through communication between the vehicle and an ICCB (In Cable Control Box). An outdoor V2L (Vehicle to Load) system is a device that allows the battery power within the EV to be used externally. As such, in order to support EV charging and discharging functions, separate devices suitable for each function are currently required.

[0005] The background technology of the present invention is disclosed in the ‘charging system for a vehicle and method for controlling the same’ of Korean Published Patent Application No. 10-2023-0101256 (July 6, 2023). The problem to be solved

[0007] The present invention was devised to improve upon the aforementioned problems, and an objective according to one aspect of the present invention is to provide an electric vehicle charging and discharging device that integrates charging and discharging functions to charge the battery of an electric vehicle and simultaneously discharge the power charged in the battery of an electric vehicle to various loads. means of solving the problem

[0009] An electric vehicle charging and discharging device according to one aspect of the present invention is characterized by comprising: a charging and discharging connector electrically connected to an electric vehicle and supplying power for charging and discharging the electric vehicle; and a charging and discharging device that converts commercial power to supply to the charging and discharging connector for charging the electric vehicle, or transmits power discharged from the electric vehicle through the charging and discharging connector to a load.

[0010] The charge / discharge connector of the present invention is characterized by comprising: a charge / discharge mode switch for selecting a charge / discharge mode; and a latch switching unit for transmitting a charge / discharge control signal to the electric vehicle according to the switching state of the charge / discharge mode switch.

[0011] The latch switching unit of the present invention is characterized by generating a voltage difference between the PE terminal and the PP terminal of the electric vehicle so that the electric vehicle recognizes the discharge mode.

[0012] The charge / discharge mode switch of the present invention is characterized in that a common contact is connected to the CP terminal of the electric vehicle, a first branch contact is connected to the PP terminal of the electric vehicle and the latch switching unit, and a second branch contact is connected to the CP terminal of the charge / discharger.

[0013] The charging and discharging device of the present invention is characterized by comprising: a relay unit installed between the charging and discharging connector and the power plug to interrupt the charging and discharging power; a power supply unit that generates the operating power of the charging and discharging device; and a processor that controls the relay unit using the power supplied from the power supply unit.

[0014] The power supply unit of the present invention is characterized by comprising: a charging rectifier unit that rectifies power charged through a power plug connected to a commercial power source; a discharging rectifier unit that rectifies power discharged through the charging / discharging connector; and a power converter unit that converts the power rectified by the charging rectifier unit or the discharging rectifier unit into operating power required for the operation of the processor.

[0015] The charging and discharging device of the present invention is characterized by further including a charging and discharging status monitoring unit that monitors the charging and discharging status of the electric vehicle.

[0016] The charge / discharge state monitoring unit of the present invention is characterized by including at least one of a leakage current sensor that detects current leaking through the charge / discharger, a power plug temperature sensor that detects the temperature of a power plug connected to a commercial power source, a voltage monitoring unit that monitors the voltage being charged / discharged of the electric vehicle, and a relay fusion monitoring unit that monitors the mechanical fusion of the relay unit.

[0017] The charging and discharging device of the present invention is characterized by including a display unit that outputs the charging and discharging status of the electric vehicle.

[0018] The present invention is characterized by further comprising: an outlet electrically connected to a load; and a connection connector electrically connecting the outlet and the charger / discharger. Effects of the invention

[0020] An electric vehicle charging and discharging device according to one aspect of the present invention integrates charging and discharging functions to charge the battery of an electric vehicle and, in addition, discharge the power charged in the battery of the electric vehicle to various loads.

[0021] An electric vehicle charging and discharging device according to another aspect of the present invention integrates charging and discharging functions, thereby eliminating the need to carry separate discharging equipment and reducing the cost of using the discharging function. Brief explanation of the drawing

[0023] FIG. 1 is a configuration diagram of an electric vehicle charging and discharging device according to one embodiment of the present invention. FIG. 2 is a block diagram of a charge / discharge connector according to one embodiment of the present invention. FIG. 3 is a configuration diagram of a charge / discharge mode switch according to one embodiment of the present invention. FIG. 4 is a block diagram of a charge / discharger according to one embodiment of the present invention. FIG. 5 is a configuration diagram of a display unit according to one embodiment of the present invention. FIG. 6 is an example diagram of a power outlet connection according to one embodiment of the present invention. Specific details for implementing the invention

[0024] Hereinafter, an exemplary embodiment of an electric vehicle charging and discharging device according to an embodiment of the present invention is described. In this process, the thickness of lines or the size of components shown in the drawings may be exaggerated for clarity and convenience of explanation. Furthermore, the terms described below are defined considering their functions in the present invention, and these may vary depending on the intention or convention of the user or operator. Therefore, the definitions of these terms should be based on the content throughout this specification.

[0025] The present invention may be implemented in various different forms and is not limited to the embodiments described herein. Furthermore, in order to clearly explain the invention in the drawings, parts unrelated to the description have been omitted, and similar parts throughout the specification have been given similar reference numerals.

[0026] Throughout the specification, when a part is described as "including" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0027] The implementations described herein may be implemented, for example, as methods or processes, devices, software programs, data streams, or signals. Even if discussed only in the context of a single form of implementation (e.g., discussed only as a method), the implementation of the discussed features may also be implemented in other forms (e.g., devices or programs). Devices may be implemented in appropriate hardware, software, and firmware, etc. Methods may be implemented in devices such as processors, which generally refer to processing devices including, for example, computers, microprocessors, integrated circuits, or programmable logic devices.

[0028] FIG. 1 is a configuration diagram of an electric vehicle charging and discharging device according to one embodiment of the present invention.

[0029] Referring to FIG. 1, an electric vehicle charging and discharging device according to one embodiment of the present invention may include a charging and discharging connector (100) and a charging and discharging device (200).

[0030] The charge / discharge connector (100) and the charge / discharger (200) are connected via a cable (400) to transmit power according to the charge / discharge mode.

[0031] One side of the charge / discharge connector (100) is connected to the charge / discharger (200) via a cable (400), and the other side can be electrically connected to the electric vehicle.

[0032] In the charging mode, the charging / discharging connector (100) can supply power supplied from the charging / discharging device (200) to the electric vehicle. At this time, the electric vehicle can charge the battery with the power supplied through the charging / discharging connector (100).

[0033] In the discharge mode, the charge / discharge connector (100) can supply power charged in the battery of the electric vehicle to the charge / discharger (200). At this time, the charge / discharger (200) can supply power supplied from the charge / discharge connector (100) to a load.

[0034] The load can be various devices or equipment that can operate using the electric vehicle's power.

[0035] FIG. 2 is a block diagram of a charge / discharge connector according to one embodiment of the present invention, and FIG. 3 is a configuration diagram of a charge / discharge mode switch according to one embodiment of the present invention.

[0036] Referring to FIGS. 2 and 3, the charge / discharge connector (100) may include a charge / discharge mode switch (120) and a latch switching unit (110).

[0037] A charge / discharge mode switch (120) is placed in the housing of the charge / discharge connector (100) so that a user can select a charge / discharge mode.

[0038] The charging / discharging mode switch (120) has a common contact connected to the CP terminal of the electric vehicle, a first branch contact connected to the PP terminal of the electric vehicle and the latch switching unit (110), and a second branch contact connected to the CP terminal of the charging / discharging device (200). Through this, the charging / discharging mode switch (120) can transmit a charging / discharging control signal to the electric vehicle according to the switching state.

[0039] The latch switching unit (110) can check whether the charge / discharge connector (100) is connected to the electric vehicle.

[0040] The latch switching unit (110) may include a first resistor (R1), a second resistor (R2), and a latch switch (S).

[0041] The first resistor (R1) and the second resistor (R2) can be connected in series.

[0042] One side of the first resistor (R1) can be connected to the second resistor (R2) and the other side can be connected to the PE terminal of the electric vehicle.

[0043] One side of the second resistor (R2) is connected to the first resistor (R1), and the other side can be connected to the PP terminal and the charge / discharge mode switch (120) of the electric vehicle.

[0044] A latch switch (S) can be placed in parallel with a first resistor (R1). The latch switch (S) can be grasped by a user depending on whether the charging / discharging connector (100) is connected to the electric vehicle. The latch switch (S) can be turned on or turned off depending on whether it is grasped by a user. When the latch switch (S) is turned on by being grasped by a user, the electric vehicle can recognize the voltage difference between the PE terminal and the PP terminal generated by the second resistor (R2). When the latch switch (S) is turned off by not being grasped by a user, the electric vehicle can recognize the voltage difference between the PE terminal and the PP terminal generated by the first resistor (R1) and the second resistor (R2).

[0045] Generally, electric vehicles do not separately transmit or receive a CP signal for the discharge mode. Electric vehicles can recognize the discharge mode through the voltage difference between the two terminals recognized via the PE terminal and the PP terminal. Accordingly, the latch switch (S) can generate a voltage difference between the PE terminal and the PP terminal so that the electric vehicle can recognize the discharge mode.

[0046] To explain in more detail, in charging mode, the common contact of the charge / discharge mode switch (120) can be connected to the second branch contact (②). Accordingly, a CP signal is transmitted and received through the CP line, and based on this, the charging mode can be executed. Since this is obvious to a person skilled in the art, a detailed explanation thereof is omitted here.

[0047] In discharge mode, the common contact of the charge / discharge mode switch (120) can be connected to the first branch contact (①). Accordingly, the CP signal is input to the PP terminal of the electric vehicle through the common contact and the first branch contact (①). At this time, a voltage difference may occur between the PE terminal and the PP terminal of the electric vehicle due to the second resistor (R2) of the latch switching unit (110).

[0048] The electric vehicle can recognize the discharge mode through the voltage difference generated between the PE terminal and the PP terminal of the electric vehicle.

[0049] The charging / discharging device (200) can convert commercial power to supply to the charging / discharging connector (100) to charge the electric vehicle, or can transfer power discharged from the electric vehicle through the charging / discharging connector (100) to the load.

[0050] FIG. 4 is a block diagram of a charge / discharger according to one embodiment of the present invention, and FIG. 5 is a diagram of a display unit according to one embodiment of the present invention.

[0051] Referring to FIG. 4, the charging / discharging device (200) may include a relay unit (210), a power supply unit (220), a current sensor (230), a charging / discharging status monitoring unit (240), and a processor (260).

[0052] The relay unit (210) is installed in the power line (L line and P line) between the charge / discharge connector (100) and the power plug (300), and can interrupt the power being charged or discharged through the power line. The relay unit (210) may include a first relay (211) and a second relay (212).

[0053] The first relay (211) is installed on the L line between the charge / discharge connector (100) and the power plug (300) to control the power being charged and discharged. The second relay (212) is installed on the N line between the charge / discharge connector (100) and the power plug (300) to control the power being charged and discharged.

[0054] The power supply unit (220) can generate operating power for the charge / discharger (200). The power supply unit (220) may include a charge rectifier (221), a discharge rectifier (223), and a power conversion unit (222).

[0055] One side of the charging rectifier (221) may be connected to the power line between the power plug (300) and the relay unit (210), and the other side may be connected to the power converter (222). The charging rectifier (221) can rectify the power supplied from the power plug (300) to the charge / discharge connector (100) during charging mode and transmit it to the power converter (222).

[0056] One side of the discharge rectifier (223) may be connected to the power line between the charge / discharge connector (100) and the relay unit (210), and the other side may be connected to the power converter (222). The discharge rectifier (223) can rectify the power supplied from the charge / discharge connector (100) to the power plug (300) during discharge mode and transmit it to the power converter (222).

[0057] The power conversion unit (222) can convert the power rectified in the charging rectifier (221) or the discharging rectifier (223) into operating power required for the operation of the processor (260). The power conversion unit (222) may be a switching mode power supply (SMPS), but is not specifically limited to it.

[0058] The current sensor (230) can detect the amount of current flowing through the power line and transmit it to the processor (260).

[0059] The monitoring unit (240) can monitor the state of the power being charged and discharged through the relay unit (210). The monitoring unit (240) may include a leakage current sensor (242), a power plug temperature sensor (241), a voltage monitoring unit (243), and a relay unit fusion monitoring unit (240). The leakage current sensor (242) can detect current leaking through the charger / discharger (200). The power plug temperature sensor (241) can detect the temperature of the power plug (300) connected to the commercial power supply. The voltage monitoring unit (243) can monitor the voltage being charged and discharged. The relay fusion monitoring unit (244) can monitor the mechanical fusion of the relay unit (210), that is, the first relay (211) and the second relay (212).

[0060] The display unit (250) can display the charging and discharging status of the electric vehicle. For example, the display unit (250) can display the current operating mode of the charging and discharging device (200) and the monitoring results of the monitoring unit (240).

[0061] The processor (260) may be connected to memory (not shown) and may execute instructions stored in memory. By executing instructions stored in memory, the processor (260) may control at least one other component (e.g., hardware or software component) connected to the processor (260) and may perform various data processing or operations.

[0062] The memory can store various data used by the processor (260). The data may include instructions for performing operations or steps according to an embodiment of the present invention. That is, the memory can store instructions that integrate charging and discharging functions to charge the battery of an electric vehicle and discharge the power charged in the battery of an electric vehicle to various loads.

[0063] The memory may include at least one storage medium among Flash memory type, Hard disk type, Multimedia card micro type, card type memory, RAM (Random Access Memory), SRAM (Static Random Access Memory), ROM (Read-Only Memory), PROM (Programmable Read-Only Memory), EPROM (Erasable Programmable Read-Only Memory), and EEPROM (Electrically Erasable Programmable Read-Only Memory).

[0064] Additionally, the processor (260) may be configured to perform each function separately at the hardware, software, or logic level. In this case, dedicated hardware may be used to perform each function. To this end, the processor (260) may be implemented as or include at least one of an ASIC (Application Specific Integrated Circuit), DSP (Digital Signal Processor), PLD (Programmable Logic Devices), FPGAs (Field Programmable Gate Arrays), CPU (Central Processing Unit), microcontrollers, and / or microprocessors.

[0065] The processor (260) may be implemented as a Central Processing Unit (CPU) or a System on Chip (SoC), and may control multiple hardware or software components connected to the processor (260) by running an operating system or application, and may perform various data processing and operations. The processor (260) may be configured to execute at least one instruction stored in memory and store the execution result data in memory.

[0066] The processor (260) can control the relay unit (210) using power supplied from the power supply unit (220).

[0067] In charging mode, the processor (260) can operate by receiving operating power through the charging rectifier (221) and the power converter (222). The processor (260) can turn on the relay unit (210) to supply power supplied from the power plug (300) to the charging / discharging connector (100). At this time, the charging / discharging connector (100) can supply power received from the charging / discharging device (200) to the electric vehicle to charge the electric vehicle.

[0068] In discharge mode, the processor (260) can operate by receiving operating power through the discharge rectifier (223) and the power converter (222). The processor (260) can turn on the relay unit (210) to supply power supplied from the charge / discharge connector (100) to the power plug (300). At this time, the power plug (300) can operate the load by supplying the power received from the charge / discharge connector (100) to various loads.

[0069] In charging mode or discharging mode, the processor (260) can control the power being charged or discharged by receiving the amount of current from the current sensor (230).

[0070] In charging mode or discharging mode, the processor (260) can receive monitoring results from the monitoring unit (240) and transmit the charging / discharging device (200). The processor (260) can display the monitoring results of the aforementioned monitoring unit (240) through the display unit (250). The processor (260) can display the current operating mode through the display unit (250).

[0071] Meanwhile, in the above-described embodiment, the charging / discharging device (200) is described as being connected to a power plug (300), but it can also be connected to various other loads.

[0072] FIG. 6 is an example diagram of a power outlet connection according to one embodiment of the present invention.

[0073] Referring to FIG. 6, an electric vehicle charging and discharging device according to one embodiment of the present invention may further include a socket connector (600) and a socket (500).

[0074] The outlet (500) can be electrically connected to various loads.

[0075] The outlet connector (600) can electrically connect the outlet (500) and the charger / discharger (200).

[0076] Accordingly, the charging / discharging device (200) can be connected to various loads through the outlet connector (600) and outlet (500) to supply power to the electric vehicle.

[0077] In this way, an electric vehicle charging and discharging device according to one embodiment of the present invention integrates charging and discharging functions to charge the battery of an electric vehicle and, at the same time, discharge the power charged in the battery of the electric vehicle to various loads.

[0078] In addition, the electric vehicle charging and discharging device according to one embodiment of the present invention integrates charging and discharging functions, thereby eliminating the need to carry separate discharging equipment and reducing the cost of using the discharging function.

[0079] As used herein, the term “part” may include a unit implemented in hardware, software, or firmware, and may be used interchangeably with terms such as logic, logic block, component, or circuit. The “part” may be a component formed integrally, or a minimum unit of said component or a part thereof that performs one or more functions. For example, according to one embodiment, the “part” may be implemented in the form of an Application-Specific Integrated Circuit (ASIC).

[0080] Although the present invention has been described with reference to the embodiments illustrated in the drawings, this is merely illustrative and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible therefrom. Accordingly, the true technical scope of protection of the present invention should be determined by the claims below. Explanation of the symbols

[0082] 100: Charge / Discharge Connector 110: Latch switching unit 120: Charge / Discharge Mode Switch 200: Charge / Discharger 210: Relay Section 220: Power supply 230: Charging rectifier 222: Power converter 223: Discharge rectifier 230: Current sensor 240: Monitoring Department 250: Display section 230: Processor 300: Power plug

Claims

Claim 1 A charging / discharging connector electrically connected to an electric vehicle to supply power for charging and discharging the electric vehicle; and a charging / discharging unit that converts commercial power to supply to the charging / discharging connector for charging the electric vehicle or transmits power discharged from the electric vehicle through the charging / discharging connector to a load, wherein the charging / discharging connector includes a charging / discharging mode switch for selecting a charging / discharging mode; and a latch switching unit that transmits a charging / discharging control signal to the electric vehicle according to the switching state of the charging / discharging mode switch, wherein the charging / discharging mode switch has a common contact connected to the CP terminal of the electric vehicle, a first branch contact connected to the PP terminal of the electric vehicle and the latch switching unit, and a second branch contact connected to the CP terminal of the charging / discharging unit, and the charging / discharging unit includes a relay unit installed between the charging / discharging connector and a power plug to interrupt the charging / discharging power; and a power supply unit that generates the operating power of the charging / discharging unit. An electric vehicle charging and discharging device comprising a processor that controls the relay unit using power supplied from the power supply unit, wherein the charging and discharging unit further comprises a charging and discharging state monitoring unit that monitors the charging and discharging state of the electric vehicle, and wherein the charging and discharging state monitoring unit comprises a leakage current sensor that detects current leaking through the charging and discharging unit, a power plug temperature sensor that detects the temperature of a power plug connected to a commercial power source, a voltage monitoring unit that monitors the charging and discharging voltage of the electric vehicle, and a relay fusion monitoring unit that monitors the mechanical fusion of the relay unit. Claim 2 delete Claim 3 In claim 1, the electric vehicle charging and discharging device wherein the latch switching unit generates a voltage difference between the PE terminal and the PP terminal of the electric vehicle so that the electric vehicle recognizes the electric vehicle in a discharge mode. Claim 4 delete Claim 5 delete Claim 6 The electric vehicle charging and discharging device according to claim 1, wherein the power supply unit comprises: a charging rectifier unit that rectifies power charged through a power plug connected to a commercial power supply; a discharging rectifier unit that rectifies power discharged through the charging and discharging connector; and a power converter unit that converts power rectified by the charging rectifier unit or the discharging rectifier unit into operating power required for the operation of the processor. Claim 7 delete Claim 8 delete Claim 9 In claim 1, the electric vehicle charging and discharging device comprises a display unit that outputs the charging and discharging status of the electric vehicle. Claim 10 An electric vehicle charging and discharging device according to claim 1, further comprising: an outlet electrically connected to a load; and a connection connector electrically connecting the outlet and the charging and discharging device.

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