Energy-saving simulation load of charging pile

Abstract

The utility model relates to the technical field of charging piles, in particular to an energy-saving simulation load of a charging pile. Comprising a charging pile simulation load host and a battery pack. The charging pile simulation load host comprises a power distribution unit, a power resistance control unit, an inversion unit, a charging control unit, a charging interface and an output interface. The power distribution unit is used for distributing electric energy to the inversion unit, the charging control unit and the power resistance control unit; 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 pack; the charging interface is used for connecting a battery pack to charge and discharge the battery pack; and the inversion unit is used for converting the high-voltage direct current from the power distribution unit or the battery pack into alternating current and supplying power to the outside through the output interface. According to the technical scheme, the energy utilization efficiency can be improved, and energy waste is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to charging pile technical field, concretely relates to a charging pile energy -conserving simulation load. BACKGROUND

[0002] With the rapid development of electric vehicle industry, as the key infrastructure of electric vehicle energy supply, the performance and safety of charging pile are increasingly valued. In order to ensure the reliability and safety of charging pile, it needs to pass strict charge and discharge test in the development and test process. However, the traditional charging pile test method has many deficiencies.

[0003] The traditional test method usually requires the actual connection electric vehicle to carry out the charge test to verify the output power, stability and other key indicators of charging pile. This method not only has high test cost, but also is limited by the availability of electric vehicle and test environment, leading to low test efficiency. In the actual test process, the electric vehicle as the load of the measured charging pile, its charging process will produce certain electric energy loss, which not only affects the accuracy of the test, but also causes great waste of energy.

[0004] In addition, due to the different models and battery capacities of electric vehicles, electric vehicles need to be frequently replaced or adjusted in the test process to adapt to different test requirements. This not only further increases the test cost, but also improves the complexity of the test and reduces the test efficiency.

[0005] In order to overcome the deficiencies of the traditional test method, some charging pile simulation load products appear in the market, such as resistance load and energy feedback type load. However, the resistance load consumes all the electric energy as heat energy, leading to great waste of energy. Although the energy feedback type load can feedback the electric energy to the power grid, the technical complexity of the energy feedback type load is high in actual application, the manufacturing cost is expensive, and the energy feedback type load may have adverse effects on the power grid in actual application, such as harmonic pollution. UTILITY MODEL CONTENTS

[0006] The utility model aims at: propose a kind of charging pile energy -conserving simulation load, this technical scheme can improve energy utilization efficiency, reduce energy waste.

[0007] To achieve the above-mentioned purpose, the charging pile energy-saving simulation load provided by the embodiment of the present disclosure comprises a charging pile simulation load host and a battery pack; the charging pile simulation load host comprises a power distribution unit, a power resistor control unit, an inverter unit, a charging control unit, a charging interface and an output interface; the power distribution unit is used to distribute electric energy to the inverter unit, the charging control unit and the power resistor control unit; the power resistor control unit is used to control the current and power of the simulation load; the charging control unit is used to convert high-voltage direct current into a constant-current constant-voltage power supply for charging the battery pack; the charging interface is used to connect the battery pack, so as to realize the charging and discharging of the battery pack; and the inverter unit is used to convert high-voltage direct current from the power distribution unit or the battery pack into alternating current and supply power to the outside through the output interface.

[0008] The beneficial effects of the basic scheme: through the power distribution unit, electric energy can be flexibly distributed to the inverter unit, the charging control unit and the power resistor control unit, so as to realize efficient management and distribution of energy. If the total current and total power of the inverter unit and the charging control unit meet the demand, the power resistor control unit is not started; if not, the power resistor control unit is controlled to open part of the power resistor according to the current or power difference. When the battery pack or the external user is not connected, the charging pile simulation load host can still work as a pure resistive load.

[0009] The electric energy distributed to the charging control unit is converted into direct current and then stored in the battery pack, so as to realize energy reuse, reduce energy consumption and achieve the purpose of energy saving. The charging pile simulation load host and the battery pack are two independent modules, so that the battery pack can be replaced and the capacity of energy storage can be flexibly adjusted.

[0010] The inverter unit can directly switch the electric energy from the power distribution unit or the battery pack to supply power to the external device without interruption. When the test charging pile is stopped or the charging pile is pulled out, the inverter unit is automatically powered by the battery pack, so that the external device will not be powered off. At the same time, the inverter unit has a leakage protection function, which is closed when leakage is detected.

[0011] As an implementable preferred scheme, the power distribution unit comprises a current sensor and a voltage sensor to monitor the current and voltage output to the power resistor control unit, the inverter unit and the charging control unit.

[0012] As an implementable preferred scheme, the charging pile simulation load host comprises a BMS simulation unit; the BMS simulation unit is located in the interior of the charging pile simulation load host and is used to simulate the functions of the battery management system, including battery voltage, current, capacity, communication protocol and various abnormality simulation.

[0013] As an implementable preferred solution, the power distribution unit generates a control signal to turn on or turn off the power resistor control unit according to the requirement of the BMS simulation unit.

[0014] As an implementable preferred solution, the power resistor control unit comprises a plurality of power resistor arrays, each of which is formed by a plurality of power resistors in parallel.

[0015] As an implementable preferred solution, the power resistor control unit is used to control the number of power resistors to be turned on according to the control signal of the power distribution unit, so as to adjust the current and power of the simulation load.

[0016] As an implementable preferred solution, the charging pile simulation load host further comprises a human-computer interface, which comprises a keyboard, a display and an indicator light; the keyboard is used to input configuration parameters and working modes; the display or the indicator light is used to view the current working state, power information and alarm information.

[0017] As an implementable preferred solution, the battery pack comprises a plurality of single batteries, and the capacity and number of the single batteries are configured according to actual requirements.

[0018] As an implementable preferred solution, the battery pack further comprises a battery pack protection unit, which is used to monitor the voltage, current and temperature of the battery pack, and cut off the circuit and generate an alarm signal in an abnormal condition; the battery pack protection unit comprises 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.

[0019] As an implementable preferred solution, the battery pack further comprises a power display unit, which is used to monitor and display the power of the battery pack in real time, and the display or the indicator light is used to prompt. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the energy-saving simulation load of the charging pile. DETAILED DESCRIPTION

[0021] In order to make the technical solutions of the present application and its advantages clearer, the technical solutions of the present application will be described in further detail below in combination with the drawings. It can be understood that the specific embodiments described herein are only part of the embodiments of the present application, and are only used to explain the present application, but not to limit the present application. It should be noted that the technical features or combinations of technical features described in the following embodiments should not be considered in isolation, and they can be combined with each other to achieve better technical effects. The same reference numerals in the drawings of the following embodiments represent the same features or components, which can be applied to different embodiments.

[0022] 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.

[0023] 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.

[0024] The present invention will now be described in further detail with reference to the accompanying drawings:

[0025] Reference Figure 1 A charging pile energy-saving simulated load includes a charging pile simulated load host and a battery pack. The charging pile simulated load host is used for signal interface with the charging gun and protocol communication with the charging pile, and to simulate the charging load of the charging pile. The battery pack is used to store the electrical energy output by the charging pile and to supply power to the charging pile simulated load host or other devices as needed.

[0026] The charging pile simulated load host includes a charging gun holder, a BMS simulation unit, a power distribution unit, a power resistor control unit, an inverter unit, a charging control unit, a human-machine interface, a charging interface, and an output interface.

[0027] 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 is used for signal interface and power transmission with the charging pile. The charging gun socket conforms to the charging pile's charging interface standard to ensure compatibility with charging piles of different brands and models.

[0028] The BMS simulation unit, located inside the charging pile's simulated load host and connected to the charging gun socket, utilizes existing simulation units to simulate the functions of a 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 via a human-machine interface. The BMS simulation unit can simulate different types of battery loads to meet the testing requirements of charging piles.

[0029] In an embodiment, the BMS simulation unit dynamically adjusts the simulated load current and power according to the preset load curve or the configuration parameters input by the user through the human-computer interface, through the built-in microprocessor. At the same time, it can also monitor the voltage, current and power of the battery pack in real time, and transmit data and interact with the charging pile through the communication protocol.

[0030] The power distribution unit is used to distribute the power output by the charging pile to the inverter unit, the charging control unit and the power resistor control unit according to a certain proportion. If the total current and total power of the inverter unit and the charging control unit meet the demand of the BMS simulation unit, the power resistor control unit will not be turned on; if not, the power resistor control unit will be turned on to meet the demand of the BMS simulation unit according to the difference in current or power. At the same time, the power distribution unit includes current sensors and voltage sensors to monitor the current and voltage output to the power resistor control unit, the inverter unit and the charging control unit, so as to monitor the total current and total power.

[0031] The power resistor control unit is used to control the number of power resistors to be turned on according to the control signal of the power distribution unit, so as to control the current and power of the simulated load.

[0032] The power resistor control unit includes a plurality of power resistor arrays, each of which is composed of a plurality of power resistors in parallel. By controlling the switching state of the power resistor array, the power resistor control unit can flexibly adjust the size of the load current and power.

[0033] The power resistor control unit also contains safety protection measures such as over-temperature protection circuit and over-current protection circuit to ensure that the circuit can be cut off in time in abnormal conditions to protect the safety of equipment and personnel.

[0034] The charging control unit is used to convert the high-voltage direct current from the power distribution unit into a constant-current constant-voltage power supply for charging the battery pack, and charges the battery pack through the output interface, including a DC / DC converter.

[0035] The charging control unit first converts the high-voltage direct current into low-voltage direct current suitable for charging the battery pack through the built-in DC / DC converter. Then, according to the charging demand of the battery pack and the configuration parameters of the BMS simulation unit, the size and trend of the charging current and voltage are adjusted.

[0036] The inverter unit is used to convert high-voltage direct current into 220V / 380V 50Hz alternating current. The inverter unit is powered by the power control unit or the battery pack, and the power is preferentially obtained through the power control unit. When the power control unit has no output, the battery pack is switched to power without interruption. When the power control unit resumes power supply, it is immediately switched back to power supply by the power control unit to ensure uninterrupted output of 220V / 380V alternating current. The inverter unit has a leakage protection function, which is turned off when leakage is detected.

[0037] The human-machine interface includes a keyboard, a display, and indicator lights for work mode setting, status display, and fault alarm. Users can input configuration parameters and work mode information through the keyboard, and view the current working state, power information, and alarm information through the display or indicator lights.

[0038] Specifically, the parameter information of the charging pile simulation load is input through the keyboard, such as the simulation load type (constant current, constant power, or battery curve load), simulation load current and power, etc. The charging mode of the battery pack and the inverter output mode are selected as parameters. Save the configuration parameters and start the charging pile simulation load host and the battery pack.

[0039] The charging interface is used to connect the battery pack to realize the charging and discharging functions of the battery pack.

[0040] The output interface is used to output the 220V / 380V 50Hz alternating current generated by the inverter unit for external power equipment.

[0041] The battery pack uses high-performance lithium-ion batteries or lead-acid batteries as energy storage elements. When charging, electrical energy is converted into chemical energy, and when discharging, chemical energy is converted into electrical energy. The charging control unit stores the electrical energy output by the charging pile into the battery pack, and when needed, the inverter unit converts the direct current of the battery pack into alternating current for other power equipment. Large-capacity battery packs use modular design, including several single batteries, which can be flexibly configured in terms of capacity and number of single batteries according to actual needs.

[0042] The battery pack includes a battery pack protection unit and a battery capacity display unit.

[0043] The battery pack protection unit is used to monitor the voltage, current, and temperature of the battery pack and to cut off the circuit in time to protect the safety of the battery pack in abnormal situations. The battery pack protection unit includes over-temperature protection circuit, over-current protection circuit, over-voltage protection circuit, over-charge protection circuit, over-discharge protection circuit, and leakage protection circuit. When the voltage, current, or temperature of the battery pack exceeds the preset threshold, the battery pack protection unit will automatically cut off the circuit and generate an alarm signal to remind the user to handle the abnormal situation in time.

[0044] The power display unit is located inside the battery pack and connected to the battery pack protection unit. It is used to monitor and display the power of the battery pack in real time, and provides prompts through the display or indicator light.

[0045] The AC output interface is located on the side or rear end of the battery pack, providing 220V / 380V 50Hz AC power for external electrical equipment. It adopts a standardized interface design to ensure compatibility with electrical equipment of different brands and models.

[0046] The working principle is as follows:

[0047] During the charging pile test, when the charging gun is connected to the charging gun seat, the charging pile simulation load host establishes a communication connection with the charging pile and receives the output power of the charging pile. The BMS simulation unit sends instructions to the power distribution unit according to the preset load simulation parameters, requiring the distribution of corresponding current or power. The power distribution unit prioritizes the distribution of power to the inverter unit and the charging control unit according to the requirements of the BMS simulation unit. If the total current and total power of the inverter unit and the charging control unit meet the requirements of the BMS simulation unit, the power resistor control unit will not be turned on; if not, the power resistor control unit will be turned on to meet the requirements of the BMS simulation unit.

[0048] The inverter unit converts the received DC power into 220V / 380V 50Hz AC power and outputs it to external electrical equipment through the 220V / 380V output interface. The charging controller unit converts the received DC power into a constant current and constant voltage power supply and charges the battery pack through the charging interface. When the charging pile test is not performed or the charging gun is not connected, the battery pack supplies power to the charging pile simulation load host in reverse through the charging interface, and outputs 220V / 380V AC power to external electrical equipment through the inverter unit.

[0049] The above is only an embodiment of the present application, and common knowledge such as specific structures and properties in the scheme is not described in detail, all ordinary technical knowledge in the technical field of the present application before the application date or the priority date is known to the person skilled in the art, all prior art in the field can be known, and the person skilled in the art has the ability to apply conventional experimental means before the date, and the person skilled in the art can perfect and implement the present scheme under the inspiration given in the present application, and some typical known structures or known methods should not be an obstacle for the person skilled in the art to implement the present application. It should be pointed out that, for the person skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, and these will not affect the effect and practicality of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like in the specification can be used to explain the content of the claims.

Claims

1. An energy-saving simulation load for a charging pile, characterized in that: The charging pile simulation load host includes a power distribution unit, a power resistor control unit, an inverter unit, a charging control unit, a charging interface and an output interface; the power distribution unit is used to distribute electric energy to the inverter unit, the charging control unit and the power resistor control unit; the power resistor control unit is used to control the current and power of the simulation load; the charging control unit is used to convert high-voltage direct current into a constant-current constant-voltage power supply for charging the battery pack; the charging interface is used to connect the battery pack to realize charging and discharging of the battery pack; the inverter unit is used to convert high-voltage direct current from the power distribution unit or the battery pack into alternating current and supply power to the outside through the output interface.

2. The energy-saving simulation load of a charging pile according to claim 1, characterized in that: The power distribution unit includes a current sensor and a voltage sensor to monitor the current and voltage output to the power resistor control unit, the inverter unit and the charging control unit.

3. The energy-saving simulation load of 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, used to simulate the functions of the battery management system, including battery voltage, current, capacity, communication protocol and various abnormal simulation.

4. The energy-saving simulation load of a charging pile according to claim 1, characterized in that: The power distribution unit generates a control signal to turn on or off the power resistor control unit according to the requirements of the BMS simulation unit.

5. The energy-saving simulation load of a charging pile according to claim 3, characterized in that: The power resistor control unit includes a plurality of power resistor arrays, each power resistor array being formed by a plurality of power resistors in parallel.

6. The energy-saving simulation load of a charging pile according to claim 4, characterized in that: The power resistor control unit is used to control the number of power resistors turned on to adjust the current and power of the simulation load according to the control signal of the power distribution unit.

7. The energy-saving simulation load of a charging pile according to claim 1, characterized in that: The charging pile simulation load host further includes a human-computer interface, which includes a keyboard, a display and an indicator light; the keyboard is used to input configuration parameters and working modes; the display or the indicator light is used to view the current working state, capacity information and alarm information.

8. The energy-saving simulation load of a charging pile according to claim 1, characterized in that: The battery pack includes a plurality of single batteries, and the capacity and number of single batteries are configured according to actual requirements.

9. The energy-saving simulation load of a charging pile according to claim 1, characterized in that: The battery pack further includes a battery pack protection unit for monitoring the voltage, current and temperature of the battery pack and cutting off the circuit and generating an alarm signal in abnormal conditions; 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 simulation load of a charging pile according to claim 1, characterized in that: The battery pack further includes a capacity display unit for real-time monitoring and displaying the capacity of the battery pack, which is prompted by the display or the indicator light.

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