Direct-current charging pile energy-saving simulation load

Abstract

The utility model relates to the technical field of charging pile testing, and specifically relates to a DC charging pile energy-saving simulation load. Comprising a charging pile simulation load host and a battery box. The charging pile simulation load host comprises a power distribution unit and a power resistance control unit. The power distribution unit is used for distributing electric energy output by a charging pile to the power resistance control unit and the charging control unit in proportion; the power resistance control unit is used for controlling the current and power of the analog load; the charging control unit is used for converting the high-voltage direct current into a constant-current and constant-voltage power supply for charging the battery box; the battery box comprises a high-capacity battery pack, an inversion unit and an alternating current output interface; the inversion unit is connected with the large-capacity battery pack and used for converting direct current output by the battery into alternating current, and the alternating current output interface is used for providing alternating current power for the outside. According to the technical scheme, the energy utilization efficiency can be improved, and energy waste is reduced.

Description

Technical Field

[0001] This utility model relates to the field of charging pile testing technology, specifically to an energy-saving simulated load for DC charging piles. Background Technology

[0002] With the rapid development of the electric vehicle industry, charging piles, as a key infrastructure for electric vehicle energy replenishment, are receiving increasing attention for their performance and safety. Therefore, charging piles require rigorous charge and discharge testing during development and testing. Traditional charging pile testing methods typically require actual connection to an electric vehicle for charging tests to verify key indicators such as output power and stability. However, this method not only increases testing costs but is also limited by the availability of electric vehicles and the testing environment, resulting in low testing efficiency.

[0003] In actual testing, the electric vehicle, acting as the load for the charging station under test, incurs energy loss during its charging process. This not only affects the accuracy of the test but also wastes energy. Furthermore, due to the varying models and battery capacities of electric vehicles, frequent replacements or adjustments are required during testing, further increasing the cost and complexity of the test.

[0004] To overcome the shortcomings of traditional testing methods, some charging pile simulated loads have emerged on the market, mainly of two types: resistive loads and energy feedback loads. Resistive loads convert all electrical energy into heat energy, resulting in a huge waste of energy; while energy feedback loads can feed electrical energy back to the grid, in practical applications, they are technically complex, expensive to manufacture, and may have adverse effects on the grid, such as harmonic pollution. These problems limit their widespread application. Utility Model Content

[0005] The purpose of this invention is to propose an energy-saving simulated load for DC charging piles. This technical solution can improve energy utilization efficiency and reduce energy waste.

[0006] To achieve the above objectives, this disclosure provides an energy-saving simulated load for a DC charging pile, including a charging pile simulated load host and a battery box;

[0007] The charging pile simulated load host includes a charging gun holder, a power distribution unit, and a power resistor control unit; the charging gun holder is used to connect the charging gun of the charging pile; the power distribution unit is used to distribute the electrical energy output by the charging pile to the power resistor control unit and the charging control unit in a proportional manner; the power resistor control unit is used to control the current and power of the simulated load; the charging control unit is used to convert high-voltage DC power into a constant current and constant voltage power supply for charging the battery box.

[0008] The battery box includes a high-capacity battery pack, an inverter unit, and an AC output interface; the inverter unit is connected to the high-capacity battery pack and is used to convert the DC power output from the battery into AC power, and the AC output interface is used to provide AC power to the outside.

[0009] The beneficial effects of the basic solution are as follows: Through the power distribution unit, the simulated load can flexibly distribute the electrical energy output from the charging pile to the power resistor control unit and the charging control unit. While simulating load testing, a portion of the electrical energy is effectively converted into charging energy for the battery pack, thereby reducing unnecessary energy loss and improving the overall system's energy utilization efficiency.

[0010] The power resistor control unit can precisely control the current and power of the simulated load, facilitating the testing of the charging pile's performance under different load conditions. Simultaneously, the charging control unit can convert high-voltage DC power into a constant current and constant voltage power supply, providing a stable and safe charging environment for the battery box and enhancing the system's versatility and adaptability.

[0011] The battery box not only serves as an energy storage device but also converts the stored DC power into AC power through an inverter unit, providing power to external devices. This achieves energy recovery and reuse, reducing dependence on the power grid and improving energy economy and environmental friendliness. While charging the battery or after it is fully charged, the battery box functions as a high-capacity power bank capable of outputting 220V / 380V 50Hz AC power, supplying power to other electrical devices. Even after disconnecting the battery box, the charging pile's simulated load host can still be used independently as a purely resistive load. Upon reconnecting the battery box, the power distribution unit allocates most or all of the current and power to the charging control unit for charging the battery box, achieving maximum energy utilization.

[0012] As a feasible preferred embodiment, the charging pile simulation load host includes a BMS simulation unit located inside the charging pile simulation load host, which is used to simulate the functions of the battery management system, including battery voltage, current, power, communication protocol, and various anomaly simulations.

[0013] As a feasible preferred embodiment, the power distribution unit includes a current sensor and a voltage sensor for real-time monitoring of the current and voltage values ​​output by the charging pile.

[0014] As a preferred feasible option, the power resistor control unit includes multiple power resistor arrays, each power resistor array consisting of multiple power resistors connected in parallel.

[0015] As a feasible preferred embodiment, the power distribution unit is also used to generate control signals to control the power resistor control unit to turn on or off some power resistors; the power resistor control unit is used to control the number of power resistors turned on according to the control signals from the power distribution unit, so as to adjust the current and power of the analog load.

[0016] As a feasible preferred embodiment, the charging pile simulated load host also includes a human-machine interface, which includes a keyboard, a display, and indicator lights; the keyboard is used to input configuration parameters and working modes; the display or the indicator lights are used to view the current working status, power information, and alarm information.

[0017] As a feasible preferred solution, the front end of the battery box is provided with a charging interface for receiving electrical energy output from the charging pile's simulated load host and storing it in the battery pack.

[0018] As a feasible preferred solution, the high-capacity battery pack includes several individual cells, and the capacity and number of individual cells are configured according to actual needs.

[0019] As a feasible preferred embodiment, the battery box also includes a battery pack protection unit located around or inside the high-capacity battery pack for monitoring the voltage, current, and temperature of the battery pack, and cutting off the circuit and generating an alarm signal in case of abnormality; the battery pack protection unit includes an over-temperature protection circuit, an over-current protection circuit, an over-voltage protection circuit, an over-charge protection circuit, an over-discharge protection circuit, and a leakage protection circuit.

[0020] As a preferred feasible solution, the battery box also includes a power display unit located inside the battery box, which is used to monitor and display the power of the battery pack in real time, and provide prompts through a display or indicator light. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of an energy-saving simulated load for a DC charging pile. Detailed Implementation

[0022] To make the technical solution and advantages of this application clearer, the technical solution of this utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of this utility model, and are only used to explain this application, not to limit it. It should be noted that the technical features or combinations of technical features described in the following embodiments should not be considered isolated; they can be combined with each other to achieve better technical effects. The same reference numerals appearing in the accompanying drawings of the following embodiments represent the same features or components, and can be applied to different embodiments.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection (including various forms of mechanical connection, such as couplings or gear pairs), or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Furthermore, unless otherwise defined, the technical or scientific terms used in this description shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0025] The present invention will now be described in further detail with reference to the accompanying drawings:

[0026] Reference Figure 1 A DC charging pile energy-saving simulated load includes a charging pile simulated load host and a battery box. The charging pile simulated load host is used for signal interface with the charging gun and protocol communication with the charging pile, and simulates the charging load of the charging pile. The battery box is used to store the electrical energy output by the charging pile, and can invert the battery pack's electrical energy into 220V / 380V 50Hz AC power for use by other electrical devices.

[0027] The charging pile simulated load host includes a charging gun holder, a BMS simulation unit, a power distribution unit, a power resistor control unit, a charging control unit, a human-machine interface, and an output interface.

[0028] The charging gun socket is the connection between the charging pile's simulated load host and the charging gun. Located at the front end of the charging pile's simulated load host, it receives the electrical energy and signals output by the charging gun. The charging gun socket is designed to conform to the charging interface standards of charging piles to ensure compatibility with charging piles of different brands and models.

[0029] The BMS simulation unit is located inside the charging pile's simulated load host. It uses existing simulation units to simulate the functions of the battery management system (BMS), including battery voltage, current, capacity, communication protocols, and various anomaly simulations. It supports constant current, constant power, and battery curve load simulations and accepts configuration management through a human-machine interface.

[0030] In one embodiment, the BMS simulation unit, through its built-in microprocessor, dynamically adjusts the simulated load current and power based on a preset load curve or configuration parameters input by the user through a human-machine interface. Simultaneously, it can monitor parameters such as battery pack voltage, current, and charge level in real time, and transmit and interact with the charging pile via a communication protocol.

[0031] The power distribution unit is used to distribute the electrical energy output by the charging pile to the charging control unit and the power resistor control unit in a certain proportion.

[0032] The power distribution unit includes current and voltage sensors to monitor the current and voltage values ​​output by the charging pile in real time. Then, based on the load current or power that the BMS simulation unit needs to simulate, and the actual charging situation of the charging control unit to the battery box, the current and power allocated to the charging control unit and the power resistor control unit are dynamically adjusted.

[0033] For example, when the current and power consumed by the charging control unit to charge the battery box cannot meet the needs of the BMS simulation unit, the power distribution unit will automatically generate a control signal to control the power resistor control unit to open part of the power resistor, thereby increasing the current and power of the simulated load. Conversely, when the current and power consumed by the charging control unit to charge the battery box increases, the power distribution unit will generate a control signal to control the power resistor control unit to close part of the power resistor or not open the power resistor control unit at all, thereby reducing the current and power of the power resistor control unit to maintain the stability of the total current and / or total power.

[0034] The power resistor control unit is used to control the number of power resistors turned on according to the control signal from the power distribution unit, so as to control the current and power of the analog load.

[0035] The power resistor control unit includes multiple power resistor arrays, each consisting of multiple power resistors connected in parallel. By controlling the switching state of the power resistor arrays, the power resistor control unit can flexibly adjust the load current and power.

[0036] The power resistor control unit also includes safety protection measures such as a cooling fan, a cooling fan drive circuit, an overheat protection circuit, and an overcurrent protection circuit to ensure that the circuit can be cut off in time under abnormal conditions, protecting the safety of equipment and personnel. The cooling fan speed is adjusted by the power resistor control unit through PWM control according to the temperature of the power resistor to achieve energy saving. When the power resistor temperature is high, the speed is increased; when the power resistor temperature is low, the speed is reduced or the cooling fan is turned off.

[0037] The charging control unit is used to convert the high-voltage DC power from the power distribution unit into a constant current and constant voltage power supply to charge the battery box, and charges the battery box through the output interface, including a DC / DC converter.

[0038] The charging control unit first steps down the high-voltage DC power to a low-voltage DC power suitable for charging the battery pack using a built-in DC / DC converter. Then, based on the charging requirements of the battery pack and the configuration parameters of the BMS simulation unit, it adjusts the magnitude and trend of the charging current and voltage.

[0039] The human-machine interface includes a keyboard, a display, and indicator lights, used for setting operating modes, displaying status, and triggering fault alarms. Users can input configuration parameters and operating modes via the keyboard, and view the current operating status, battery level, and alarm information via the display or indicator lights.

[0040] Specifically, users can input the parameters of the simulated load of the charging pile via the keyboard, such as the simulated load type (constant current, constant power, or battery curve load), simulated load current and power, etc.; select the charging mode and inverter output mode of the battery box, etc.; save the configuration parameters and start the charging pile simulated load host and battery box.

[0041] The battery box includes a charging interface, a high-capacity battery pack, a battery pack protection unit, an inverter unit, a power display unit, and an AC output interface.

[0042] The charging interface, located at the front of the battery box, is used to receive electrical energy output from the charging pile's simulated load host and store it in the battery pack.

[0043] The large-capacity battery pack, located inside the battery box, uses high-performance lithium-ion batteries or lead-acid batteries as energy storage components. During charging, electrical energy is converted into chemical energy, and during discharging, chemical energy is converted back into electrical energy. The charging control unit stores the electrical energy output from the charging station into the battery pack, and when needed, the inverter unit converts the DC power from the battery pack into AC power for use by other electrical devices. The large-capacity battery pack adopts a modular design, including several individual cells, allowing for flexible configuration of the capacity and number of individual cells according to actual needs.

[0044] The battery pack protection unit, located around or inside a large-capacity battery pack, monitors parameters such as voltage, current, and temperature. In abnormal situations, it promptly disconnects the circuit to protect the battery pack. The battery pack protection unit includes over-temperature protection, over-current protection, over-voltage protection, over-charge protection, over-discharge protection, and leakage protection circuits. When the battery pack's voltage, current, or temperature exceeds a preset threshold, the battery pack protection unit automatically disconnects the circuit and generates an alarm signal to alert the user to address the abnormal situation promptly.

[0045] The inverter unit, located inside the battery box and connected to the high-capacity battery pack, converts the DC power from the battery pack into 220V / 380V 50Hz AC power for use by other electrical devices. The inverter unit employs PWM modulation technology to achieve a highly efficient and stable inverter process.

[0046] The power display unit, located inside the battery compartment and connected to the battery pack protection unit, is used to monitor and display the battery pack's power level in real time, providing alerts via a display or indicator light.

[0047] The AC output interface, located on the top, side, or rear of the battery box, is used to connect the cable between the battery box and other electrical equipment, providing 220V / 380V 50Hz AC power to external electrical equipment. It adopts a standardized interface design to ensure compatibility with electrical equipment of different brands and models.

[0048] The working principle is as follows:

[0049] During charging pile testing, the charging pile simulated load host is connected to the charging gun of the charging pile via the charging gun socket. The BMS simulation unit dynamically adjusts the simulated load current and power according to a preset load curve or configuration parameters input by the user through the human-machine interface, simulating the functions of the battery management system, including monitoring and simulating anomalies in battery voltage, current, and capacity. The power distribution module monitors the current and voltage values ​​output by the charging pile in real time and dynamically adjusts the current and power allocated to both based on the needs of the BMS simulation unit and the actual charging situation of the charging control unit to the battery box. The power resistor control unit controls the number of power resistors to open or close according to the control signals from the power distribution unit to control the load current and power. The charging control unit converts the high-voltage DC power from the power distribution unit into low-voltage DC power suitable for charging the battery box and adjusts the charging current and voltage according to the charging requirements of the battery box and the configuration parameters of the BMS simulation unit. The electrical energy output from the charging pile is stored in the large-capacity battery pack in the battery box; the inverter unit inverts the DC power from the battery pack into 220V / 380V 50Hz AC power for use by other electrical devices.

[0050] The above content is merely an embodiment of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can improve and implement this solution based on the guidance provided in this application and their own capabilities. Typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A charging pile energy-saving simulated load, characterized in that: Includes the charging pile simulation load host and battery box; The charging pile simulated load host includes a charging gun holder, a power distribution unit, and a power resistor control unit; the charging gun holder is used to connect the charging gun of the charging pile; the power distribution unit is used to distribute the electrical energy output by the charging pile to the power resistor control unit and the charging control unit in a proportional manner; the power resistor control unit is used to control the current and power of the simulated load; the charging control unit is used to convert high-voltage DC power into a constant current and constant voltage power supply for charging the battery box. The battery box includes a high-capacity battery pack, an inverter unit, and an AC output interface; the inverter unit is connected to the high-capacity battery pack and is used to convert the DC power output from the battery into AC power, and the AC output interface is used to provide AC power to the outside.

2. The energy-saving simulated load for a charging pile according to claim 1, characterized in that: The charging pile simulation load host includes a BMS simulation unit located inside the charging pile simulation load host. It is used to simulate the functions of the battery management system, including battery voltage, current, power, communication protocol, and various anomaly simulations.

3. The energy-saving simulated load for a charging pile according to claim 1, characterized in that: The power distribution unit includes a current sensor and a voltage sensor, used to monitor the current and voltage values ​​output by the charging pile in real time.

4. The energy-saving simulated load for a charging pile according to claim 3, characterized in that: The power resistor control unit includes multiple power resistor arrays, each of which consists of multiple power resistors connected in parallel; the power resistor control unit also includes a cooling fan, a cooling fan drive circuit, an overheat protection circuit, and an overcurrent protection circuit.

5. The energy-saving simulated load for a charging pile according to claim 4, characterized in that: The power distribution unit is also used to generate control signals to control the power resistor control unit to open or close some power resistors; the power resistor control unit is used to control the number of power resistors opened according to the control signals from the power distribution unit, so as to adjust the current and power of the analog load.

6. The energy-saving simulated load for a charging pile according to claim 1, characterized in that: The charging pile simulated load host also includes a human-machine interface, which includes a keyboard, a display, and indicator lights. The keyboard is used to input configuration parameters and working modes. The display or indicator lights are used to view the current working status, power information, and alarm information.

7. The energy-saving simulated load for a charging pile according to claim 1, characterized in that: The front end of the battery box is equipped with a charging interface for receiving electrical energy output from the charging pile's simulated load host and storing it in the battery pack.

8. The energy-saving simulated load for a charging pile according to claim 1, characterized in that: The high-capacity battery pack includes several individual cells, and the capacity and number of individual cells are configured according to actual needs.

9. The energy-saving simulated load for a charging pile according to claim 1, characterized in that: The battery box also includes a battery pack protection unit, located around or inside the large-capacity battery pack, for monitoring the voltage, current and temperature of the battery pack, and cutting off the circuit and generating an alarm signal in case of abnormality; the battery pack protection unit includes an over-temperature protection circuit, an over-current protection circuit, an over-voltage protection circuit, an over-charge protection circuit, an over-discharge protection circuit and a leakage protection circuit.

10. The energy-saving simulated load for a charging pile according to claim 1, characterized in that: The battery box also includes a power display unit located inside the battery box, which is used to monitor and display the power of the battery pack in real time and provide prompts through a display or indicator light.

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