A battery replacement station with energy storage function

Abstract

The present invention proposes a battery swap station with energy storage function, which includes at least several energy storage inverters; the voltage level of the AC side of the energy storage inverter is equivalent to the voltage level of the low-voltage side of the main transformer of the battery swap station; a single energy storage inverter includes several branch DC / DC converters; each battery pack is connected to a DC / DC converter, which is converted into a constant voltage and then connected in parallel, and finally merged into the energy storage inverter for inversion. The present invention replaces the charger with the bidirectional energy storage inverter commonly used in energy storage power stations to charge the batteries of the battery swap station, and cooperates with the intelligent energy management system and the scheduling and appointment battery swap system to realize the use of backup batteries to feed power to the power grid in the battery swap station and to the outside at the appropriate time. It can greatly improve the power consumption stability and reliability of the battery swap station while ensuring the efficiency of power swapping, and at the same time has the ability to provide auxiliary value-added services to the power supply power plant.

Description

Technical Field

[0001] The present invention relates to the technical field of battery swap station construction, and in particular to a battery swap station with an energy storage function. Background Art

[0002] Lithium-ion batteries and new energy electric vehicles have gradually matured in the past decade and have developed rapidly in my country. Electricity is the main alternative energy source for future automobile transportation, because it can be converted from a variety of clean and renewable energy sources such as solar energy, hydropower, wind energy and nuclear energy, and can also reduce the country's dependence on non-renewable energy such as oil. As people pay more attention to the concepts of environmental protection, low-carbon economy and reducing energy consumption, the automobile industry faces increasingly severe challenges due to its exhaust emissions, high energy consumption and other negative effects. Compared with traditional fuel vehicles, new energy vehicles can effectively reduce automobile exhaust pollution. From an environmental perspective, the exhaust emissions of new energy vehicles can be reduced by 92%-98% compared with traditional vehicles, thereby realizing the diversification of transportation energy and protecting the environment; from an energy perspective, the global oil crisis is becoming increasingly serious, and the automobile industry is the largest component of energy consumption. The development and use of new energy vehicles effectively solves the problem of heavy transportation energy consumption and achieves sustainable development of a low-carbon economy.

[0003] In recent years, both the national and local levels have clearly encouraged and supported the promotion and use of new energy vehicles. The 2014 Government Work Report once again clearly proposed "promoting new energy vehicles", insisting on the national strategy of developing new energy vehicles, the main strategic orientation of pure electric drive for the development of new energy vehicles and the transformation of the automobile industry, the development goals determined by the plan, and the policy orientation of government support. In order to accelerate the promotion of new energy vehicles, many local governments have issued relevant regulations on vehicle purchase subsidies, charging pile construction, and new car registration.

[0004] Energy replenishment for new energy electric vehicles can be divided into two modes: plug-in charging and battery replacement. In the plug-in charging mode, there are three main problems: high initial cost of purchasing batteries, long charging time, and low charging safety. In addition, in the plug-in charging mode, the charging load of new energy electric vehicles has significant temporal and spatial randomness, which will have an adverse impact on the operation and planning of the power grid. The battery replacement mode combined with large-scale centralized charging has become another competitive business technology model for the current development of electric vehicles. First, this mode can effectively reduce the energy replenishment time of electric vehicles. Second, this mode can centrally manage charging safety and ensure the safety and reliability of the battery system. Third, through a reasonable business operation model and the use of battery leasing, it is possible to effectively control business costs and centrally and effectively control the traceability of the battery system.

[0005] Compared with battery swapping for passenger cars, battery swapping stations for heavy-duty transportation and mining machinery are often built far away from cities, in rural areas or even in the wild. The stability of rural power grids or temporary power grids in construction areas is poor, resulting in the risk of unstable voltage or power outages at battery swapping stations; once such a situation occurs, the batteries in the battery swapping station cannot be charged and the battery swapping mechanism cannot operate, which greatly affects the normal use of battery swapping vehicles or construction machinery. On the other hand, some large battery swapping stations are sometimes built specifically around power plants. For example, they can be built next to thermal power plants to utilize the low-cost direct power supply from thermal power plants; or they can be built near renewable energy power stations such as wind power and photovoltaic power plants, to a certain extent, they can use the zero-cost abandoned power that cannot be connected to the Internet to reduce the cost of use. In this case, the battery swapping station needs to stabilize the fluctuation of input power on the one hand, and on the other hand, it also has the possibility of providing auxiliary services such as peak load regulation and frequency regulation to the power plant, and further obtain additional benefits. For large battery swapping stations, the backup battery in the station is also a potential battery energy storage system with a capacity that cannot be ignored. If it is used flexibly, it can improve the power supply stability of the battery swapping station and even obtain additional benefits.

[0006] Existing large-scale battery swap stations generally use fixed chargers to charge batteries. Even if some of them use intelligent chargers, they can achieve a reasonable distribution of input power, improve the vehicle's battery swap efficiency and reduce the average waiting time while ensuring that the power load is basically stable. However, the charger is a one-way energy supply device that can only realize the energy flow from the power grid to the battery and cannot be used in the reverse direction.

[0007] Therefore, how to provide a new type of battery swap station with energy storage function that can significantly improve the power consumption stability and reliability of the battery swap station while ensuring the battery swap efficiency, and at the same time have the ability to provide auxiliary value-added services to power supply plants is a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0008] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. It proposes a battery swap station with energy storage function, in which the bidirectional energy storage inverter (PCS) generally used in the energy storage station is used to replace the charger for charging the battery of the battery swap station, and cooperates with the intelligent energy management system and the scheduling and appointment battery swap system to realize the use of backup batteries to feed power to the power grid in the battery swap station and to the outside at the appropriate time. Under the premise of ensuring the battery swap efficiency, the power consumption stability and reliability of the battery swap station can be greatly improved, and at the same time, the station has the ability to provide auxiliary value-added services to the power supply plant.

[0009] In view of this, the present invention proposes a battery swap station with energy storage function, which includes at least several energy storage inverters; the voltage level of the AC side of the energy storage inverter is equivalent to the voltage level of the low-voltage side of the main transformer of the battery swap station; a single energy storage inverter includes several branch DC / DC converters; each battery pack is connected to a DC / DC converter, converted into a constant voltage and then connected in parallel, and finally merged into the energy storage inverter for inversion.

[0010] The battery swap station of the present invention draws electricity from a nearby power grid through a main transformer. The voltage level on the low-voltage side of the main transformer is equivalent to the AC side of the energy storage inverter (PCS). The energy storage inverter adopts a multi-branch modular DC / DC access design. Each battery pack is connected to a DC / DC converter. Different and dynamically changeable charging / discharging powers can be allocated to different battery pack branches according to instructions, and charging and discharging strategies can be independently formulated.

[0011] In the aforementioned battery swap station with energy storage function, each energy storage inverter is independently in a charging or discharging state.

[0012] The aforementioned battery swap station with energy storage function also includes an in-station power consumption system, and the in-station power consumption system is connected to the low-voltage side of the main transformer.

[0013] In the aforementioned battery swap station with energy storage function, the power consumption system within the station is connected to the low-voltage side of the main transformer through the station transformer.

[0014] In the present invention, the power consumption system in the station is connected to the low-voltage side of the main transformer through the station transformer. When the battery system is discharged through the energy storage converter, the power consumption system in the station can be used for replenishment first.

[0015] The aforementioned battery swap station with energy storage function also includes a wind power system and a photovoltaic system; the photovoltaic system directly connects direct current to the DC bus after the DC / DC parallel connection inside the energy storage inverter; the wind power system connects to the AC bus on the low-voltage side of the main transformer after AC boosting.

[0016] In the present invention, the battery swap station also includes a wind power system and a photovoltaic system. This mode is suitable for directly building a photovoltaic and wind power distributed power station around the battery swap station, and the output control of the photovoltaic system and the wind power system is uniformly controlled by the system of the battery swap station. At this time, the photovoltaic system adopts a DC convergence and voltage stabilization architecture, and directly integrates DC power into the DC bus after the DC / DC parallel connection inside the PCS, which can eliminate the two DC / AC conversion processes. In the battery pack charging mode, the power of the photovoltaic system is preferentially supplied to the battery pack charging; in the discharge mode, the photovoltaic system and the battery pack together preferentially supply power to other energy storage inverters and power consumption systems within the station, and the remaining power is connected to the grid. The wind power system preferentially supplies energy storage inverters and power consumption systems within the station, and the remaining power is connected to the grid.

[0017] The aforementioned battery swap station with energy storage function also includes an external power supply; the external power supply includes power supply for thermal power plants, wind power systems and photovoltaic systems, among which the wind power systems and photovoltaic systems are connected to the high-voltage side of the main transformer of the battery swap station through renewable energy transformers as supplementary power sources; the power supply for thermal power plants is directly connected to the high-voltage side of the main transformer of the battery swap station.

[0018] When the battery swap station cannot draw power from a nearby power grid through the main transformer and needs to draw power from a distant power grid or from a power grid that is not affiliated with the battery swap station, the battery swap station draws power from external power sources. These power sources are known but uncontrollable external variables, and the energy flow will be regulated according to the status and needs of these external power sources.

[0019] The aforementioned battery swap station with energy storage function, the power consumption system in the station includes an energy management system, a lighting and heating system, and a battery swap mechanism, wherein the energy management system includes:

[0020] The vehicle intelligent monitoring platform collects vehicle status data and analyzes and predicts the vehicle battery replacement time interval information; and transmits the battery replacement time interval information;

[0021] Station control system: collects power data of energy storage converters and status information of battery packs in the station, predicts battery pack power change curves, and transmits battery pack power change curves;

[0022] Renewable energy electric control system, which collects power forecast curves of wind power system and photovoltaic system and transmits this information;

[0023] The dispatching system of thermal power plants collects peak load and frequency regulation requirements and transmits this information;

[0024] The energy storage management system receives the battery replacement time interval information, battery pack power change curve, wind power system and photovoltaic system power forecast curve, and peak and frequency regulation requirements transmitted by the vehicle intelligent monitoring platform, and determines and transmits charging or discharging instructions.

[0025] The vehicle intelligent monitoring platform in the present invention collects data such as the location, speed, and battery level of the battery-swapping vehicle, and predicts the timetable (interval) for the next battery swap for each vehicle based on the data analysis of the vehicle's historical operation. The station control system collects power data of the energy storage inverter, the status of the battery packs in the station, such as the power, temperature, and health status of each battery pack, and simulates and predicts the change curve of the battery power in the short term in the future. The energy storage management system determines which battery packs should be charged, which can wait, and which need to provide discharge services, and transmits the charge and discharge instructions to each energy storage inverter to realize charging and discharging.

[0026] For the aforementioned battery swap stations with energy storage functions, the vehicle intelligent monitoring platform needs to combine the vehicle's historical operation data when analyzing and predicting the vehicle's battery swap time interval information.

[0027] For the aforementioned battery swap stations with energy storage functions, the station control system needs to combine the historical data of the battery pack to predict the battery pack charge change curve.

[0028] Through the above technical solution, the present invention proposes a battery swap station with energy storage function, which has the following technical effects:

[0029] 1. The present invention uses the bidirectional energy storage inverter (PCS) commonly used in battery swap stations to replace the charger for battery charging in the battery swap station, and cooperates with the intelligent energy management system and the scheduling and appointment battery swap system to realize the use of backup batteries to feed power to the power grid in the battery swap station and to the outside at the appropriate time. Under the premise of ensuring the battery swap efficiency, the power consumption stability and reliability of the battery swap station can be greatly improved, and at the same time, it has the ability to provide auxiliary value-added services to the power supply power plant.

[0030] 2. After being discarded, the battery swap station and battery pack can continue to be used as an energy storage station, which greatly reduces the construction cost and equipment cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0032] Figure 1 This is the electrical system diagram of the battery swap station provided in Example 1.

[0033] Figure 2 This is the electrical system diagram of the battery swap station provided in Example 2.

[0034] Figure 3 This is the electrical system diagram of the battery swap station provided in Example 3.

[0035] Figure 4 Schematic diagram of the battery swap station energy management system provided in Example 3.

[0036] Among them, 1 is the main transformer, 2 is the external power grid, 3 is the thermal power plant, 4 is the energy storage inverter, 5 is the battery pack, 6 is the station transformer, 7 is the energy management system, 8 is the lighting and heating system, 9 is the battery replacement mechanism, 10 is the photovoltaic system, 11 is the wind power system, 12 is the renewable energy transformer, 13 is the vehicle intelligent monitoring platform, 14 is the station control system, 15 is the renewable energy electric control system, 16 is the thermal power plant dispatching system, and 17 is the energy storage management system. DETAILED DESCRIPTION

[0037] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0039] Example 1

[0040] like Figure 1 This embodiment proposes a battery swap station with energy storage function. The battery swap station takes power from the external power grid 2 that is close to it through the main transformer 1, and at least includes several energy storage converters 4 and power consumption systems in the station; the voltage level of the AC side of the energy storage converter 4 is equivalent to the voltage level of the low-voltage side of the main transformer 1 of the battery swap station; a single energy storage converter 4 includes several branch DC / DC converters; each battery pack 5 is connected to a DC / DC converter, which is converted into a constant voltage and then connected in parallel, and finally merged into the energy storage converter 4 for inversion. Each energy storage converter 4 in this embodiment is independently in a charging or discharging state. For example, if there is a short power outage, some PCSs can call the battery pack 5 branch with idle power connected to it for discharge, and supply power to the power consumption system in the battery swap station and the battery pack 5 that is eager to charge, and then charge and supplement after the power grid resumes power supply. Similarly, when the battery swap station is in a relatively idle period, the battery pack 5 with idle capacity (charging or discharging margin) can also be used to perform peak-shaving and valley-filling services for the power grid, and to perform peak-valley difference arbitrage.

[0041] The voltage level of the low-voltage side of the main transformer 1 is equivalent to the AC side of the energy storage converter 4 (PCS). The energy storage converter 4 adopts a multi-branch modular DC / DC access design. Each battery pack 5 is connected to a DC / DC converter. Different and dynamically changeable charging / discharging powers can be allocated to different battery pack 5 branches according to instructions, and charging and discharging policies can be independently formulated. For example, for battery packs 5 that are in a hurry to replace the vehicle, full power charging can be allocated; for battery packs 5 with high power but not in a hurry to replace, a part of the power share can be used to support emergency power use of other parts of the battery swap station or provide grid auxiliary services.

[0042] In this embodiment, the power consumption system in the station is connected from the low voltage side of the main transformer 1. If the voltage level does not match the energy storage converter 4, the power consumption system in the station can be connected to the low voltage side of the main transformer 1 through the station transformer 6. When the battery pack 5 is discharged through the energy storage converter 4, the power consumption system in the station can be used first.

[0043] The power consumption system in the station in this embodiment includes an energy management system 7, a lighting and heating system 8, and a power exchange mechanism 9, wherein the energy management system 7 includes:

[0044] The vehicle intelligent monitoring platform 13 collects vehicle status data and analyzes and predicts the vehicle battery replacement time interval information; and transmits the battery replacement time interval information;

[0045] The station control system 14 collects the power data of the energy storage converter 4 and the status information of the battery pack 5 in the station, predicts the power change curve of the battery pack 5, and transmits the power change curve of the battery pack 5;

[0046] The energy storage management system 17 receives the battery replacement time interval information and the battery pack 5 power change curve transmitted by the vehicle intelligent monitoring platform 13, determines and transmits the charging or discharging instructions.

[0047] In this embodiment, the vehicle intelligent monitoring platform 13 collects data such as the location, speed, battery level, etc. of electric vehicles or mechanical equipment such as battery-swapping heavy trucks and mining trucks, and predicts the timetable (interval) for the next battery swap for each vehicle based on the data analysis of the vehicle's historical operation. Among them, the station control system 14 collects the power data of the energy storage inverter 4, the status of the battery packs 5 in the station, such as the power, temperature, health status and other parameters of each battery pack 5, and combines historical data to simulate and predict the change curve of the battery power in the short term in the future. The energy storage management system 17 determines which of the current battery packs 5 should be charged, which can wait, and which need to provide discharge services through the vehicle's battery swap time interval information and the battery pack 5 power change curve, and transmits the charge and discharge instructions to each energy storage inverter 4 to achieve charging and discharging.

[0048] Example 2

[0049] like Figure 2 , this embodiment proposes to directly build a battery swap station with energy storage function around the photovoltaic and wind power distributed power stations. The output control of the photovoltaic system 10 and the wind power system 11 is uniformly controlled by the system of the battery swap station. The battery swap station in this embodiment includes at least several energy storage converters 4, power consumption systems in the station, wind power systems 11 and photovoltaic systems 10; the voltage level of the AC side of the energy storage converter 4 is equivalent to the voltage level of the low-voltage side of the main transformer 1 of the battery swap station; a single energy storage converter 4 includes several branch DC / DC converters; each battery pack 5 is connected to a DC / DC converter, converted into a constant voltage and then connected in parallel, and finally merged into the energy storage converter 4 for inversion. Each energy storage converter 4 in this embodiment is independently in a charging or discharging state. For example, if there is a short power outage, some PCSs can call the battery pack 5 branch with idle power connected to them for discharge, supply power to the power consumption system in the battery swap station and the battery pack 5 that is eager to charge, and then charge and supplement after the power grid resumes power supply. Similarly, when the battery swap station is in a relatively idle period, the battery pack 5 with idle capacity (charging or discharging margin) can also be used to provide peak-shaving and valley-filling services for the power grid and perform peak-valley arbitrage.

[0050] In this embodiment, the battery swap station draws power from the nearby external power grid 2 through the main transformer 1. The voltage level of the low-voltage side of the main transformer 1 is equivalent to the AC side of the energy storage converter 4 (PCS). The energy storage converter 4 adopts a multi-branch modular DC / DC access design. Each battery pack 5 is connected to a DC / DC converter. Different and dynamically changeable charging / discharging powers can be allocated to different battery pack 5 branches according to instructions, and charging and discharging policies can be independently formulated. For example, for battery packs 5 that are in a hurry to replace the vehicle, full power charging can be allocated; for battery packs 5 with high power but not in a hurry to replace, a portion of the power share can be used to support emergency power use of other parts of the battery swap station or provide grid auxiliary services.

[0051] In this embodiment, the power consumption system in the station is connected from the low voltage side of the main transformer 1. If the voltage level does not match the energy storage converter 4, the power consumption system in the station can be connected to the low voltage side of the main transformer 1 through the station transformer 6. When the battery pack 5 is discharged through the energy storage converter 4, the power consumption system in the station can be used first.

[0052] The photovoltaic system 10 in this embodiment is directly connected to the DC bus of the DC / DC parallel connection inside the energy storage inverter 4 with direct current. At this time, the photovoltaic system 10 adopts a DC convergence and voltage stabilization architecture, and directly connects direct current to the DC bus of the DC / DC parallel connection inside the PCS, so that the two DC / AC conversion processes can be eliminated. In the charging mode of the battery pack 5, the power of the photovoltaic system 10 is preferentially supplied to the battery pack 5 for charging; in the discharge mode, the photovoltaic system 10 and the battery pack 5 are preferentially supplied to other energy storage inverters 4 and power consumption systems in the station, and the remaining power is connected to the grid for power supply. This embodiment can be further understood as adjusting the photovoltaic maximum power point tracking to reduce the output power of the photovoltaic when the battery pack 5 is full and there is no discharge demand from the grid (that is, the power generated by the photovoltaic system 10 at this time cannot be connected to the grid and cannot be used for charging).

[0053] The wind power system 11 in this embodiment is connected to the AC busbar on the low voltage side of the main transformer 1 after AC boosting. The wind power system 11 supplies the energy storage converter 4 and the power consumption system in the station first, and the remaining power is connected to the grid for power supply.

[0054] The power consumption system in the station in this embodiment includes an energy management system 7, a lighting and heating system 8, and a power exchange mechanism 9, wherein the energy management system 7 includes:

[0055] The vehicle intelligent monitoring platform 13 collects vehicle status data and analyzes and predicts the vehicle battery replacement time interval information; and transmits the battery replacement time interval information;

[0056] The station control system 14 collects the power data of the energy storage converter 4 and the status information of the battery pack 5 in the station, predicts the power change curve of the battery pack 5, and transmits the power change curve of the battery pack 5;

[0057] The renewable energy electric control system 15 collects the power prediction curves of the wind power system 11 and the photovoltaic system 10 and transmits the information;

[0058] The energy storage management system 17 receives the battery replacement time interval information, the battery pack 5 power change curve, and the wind power system 11 and photovoltaic system 10 power prediction curves transmitted by the vehicle intelligent monitoring platform 13, determines and transmits charging or discharging instructions.

[0059] In this embodiment, the vehicle intelligent monitoring platform 13 collects data such as the location, speed, battery level, etc. of electric vehicles or mechanical equipment such as battery-swapping heavy trucks and mining trucks, and predicts the timetable (interval) for the next battery swap for each vehicle based on the data analysis of the vehicle's historical operation. Among them, the station control system 14 collects the power data of the energy storage inverter 4, the status of the battery pack 5 in the station, such as the power, temperature, health status and other parameters of each battery pack 5, and combines historical data to simulate and predict the change curve of the battery power in the short term in the future. The energy storage management system 17 uses the vehicle battery swap time interval information, the battery pack 5 power change curve, and the power prediction curves of the wind power system 11 and the photovoltaic system 10 to determine which of the current battery packs 5 should be charged, which can wait, and which need to provide discharge services, and transmits the charge and discharge instructions to each energy storage inverter 4 to achieve charging and discharging.

[0060] Example 3

[0061] like Figure 3 , when the battery swap station cannot draw power from the external power grid 2 that is closer to it through the main transformer 1, and needs to draw power from a distant power grid or from a power grid that is not affiliated with the battery swap station, this embodiment proposes a battery swap station with energy storage function that draws power from an external power source, including at least a number of energy storage converters 4, a power consumption system in the station, and an external power source; the voltage level on the AC side of the energy storage converter 4 is equivalent to the voltage level on the low-voltage side of the main transformer 1 of the battery swap station; a single energy storage converter 4 includes a number of branch DC / DC converters; each battery pack 5 is connected to a DC / DC converter, which is converted into a constant voltage and then connected in parallel, and finally merged into the energy storage converter 4 for inversion. In this embodiment, each energy storage converter 4 is independently in a charging or discharging state. For example, if a short power outage occurs, some PCSs can call the battery pack 5 branch with idle power connected to them for discharge, supply power to the power consumption system in the battery swap station and the battery pack 5 that is eager to charge, and then charge and supplement after the power grid resumes power supply. Similarly, when the battery swap station is in a relatively idle period, the battery pack 5 with idle capacity (charging or discharging margin) can also be used to provide peak-shaving and valley-filling services for the power grid and perform peak-valley arbitrage.

[0062] The voltage level of the low-voltage side of the main transformer 1 is equivalent to the AC side of the energy storage converter 4 (PCS). The energy storage converter 4 adopts a multi-branch modular DC / DC access design. Each battery pack 5 is connected to a DC / DC converter. Different and dynamically changeable charging / discharging powers can be allocated to different battery pack 5 branches according to instructions, and charging and discharging policies can be independently formulated. For example, for battery packs 5 that are in a hurry to replace the vehicle, full power charging can be allocated; for battery packs 5 with high power but not in a hurry to replace, a part of the power share can be used to support emergency power use of other parts of the battery swap station or provide grid auxiliary services.

[0063] In this embodiment, the power consumption system in the station is connected from the low voltage side of the main transformer 1. If the voltage level does not match the energy storage converter 4, the power consumption system in the station can be connected to the low voltage side of the main transformer 1 through the station transformer 6. When the battery pack 5 is discharged through the energy storage converter 4, the power consumption system in the station can be used first.

[0064] The external power supply in this embodiment is a known but uncontrollable external variable, and the energy flow will be regulated according to the status and demand of these external power supplies. The external power supply in this embodiment can be understood as including the power supply of the thermal power station, the wind power system 11 and the photovoltaic system 10, wherein the wind power system 11 and the photovoltaic system 10 are connected to the high-voltage side of the main transformer 1 of the battery swap station through the renewable energy transformer 12 as a supplementary power source; the power supply of the thermal power station is directly connected to the high-voltage side of the main transformer 1 of the battery swap station. In addition, the power prediction curves of the photovoltaic system 10 and the wind power system 11, and the peak load and dispatch requirements obtained by the thermal power plant 3 after receiving the grid dispatch will be transmitted to the power consumption system in the station for unified energy management.

[0065] like Figure 4 The power consumption system in the station in this embodiment includes an energy management system 7, a lighting and heating system 8, and a power exchange mechanism 9, wherein the energy management system 7 includes:

[0066] The vehicle intelligent monitoring platform 13 collects vehicle status data and analyzes and predicts the vehicle battery replacement time interval information; and transmits the battery replacement time interval information;

[0067] The station control system 14 collects the power data of the energy storage converter 4 and the status information of the battery pack 5 in the station, predicts the power change curve of the battery pack 5, and transmits the power change curve of the battery pack 5;

[0068] The renewable energy electric control system 15 collects the power prediction curves of the wind power system 11 and the photovoltaic system 10 and transmits the information;

[0069] The thermal power plant dispatching system 16 collects peak load and frequency regulation requirements and transmits the information;

[0070] The energy storage management system 17 receives the battery replacement time interval information, the battery pack 5 power change curve, the wind power system 11 and the photovoltaic system 10 power prediction curve, and the peak and frequency regulation requirements transmitted by the vehicle intelligent monitoring platform 13, and determines and transmits the charging or discharging instructions.

[0071] In this embodiment, the vehicle intelligent monitoring platform 13 collects data such as the location, speed, battery level, etc. of electric vehicles or mechanical equipment such as battery-swapping heavy trucks and mining trucks, and predicts the timetable (interval) for the next battery swap for each vehicle based on the data analysis of the vehicle's historical operation. Among them, the station control system 14 collects the power data of the energy storage inverter 4, the status of the battery pack 5 in the station, such as the power, temperature, health status and other parameters of each battery pack 5, and combines historical data to simulate and predict the change curve of the battery power in the short term in the future. The energy storage management system 17 uses the vehicle battery swap time interval information, the battery pack 5 power change curve, the power prediction curve of the wind power system 11 and the photovoltaic system 10, and the peak-shaving and frequency modulation requirements collected by the thermal power plant dispatching system 16 to determine which of the current battery packs 5 should be charged, which can wait, and which need to provide discharge services, and transmits the charging and discharging instructions to each energy storage inverter 4 to achieve charging and discharging.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery swap station with energy storage function, characterized in that: At least several energy storage converters are included, each of which is independently in a charging or discharging state; the voltage level of the AC side of the energy storage converter is equivalent to the voltage level of the low-voltage side of the main transformer of the power exchange station; a single energy storage converter includes several branch DC / DC converters; each battery pack is connected to one of the DC / DC converters, converted into a constant voltage and then connected in parallel, and finally merged into the energy storage converter for inversion; The power consumption system in the station is connected to the low voltage side of the main transformer through the transformer in the station; It includes energy management system, lighting and heating system, and power exchange mechanism; The energy management system comprises: A vehicle intelligent monitoring platform collects vehicle status data and combines it with historical vehicle operation data to analyze and predict vehicle battery replacement time interval information, and transmits the battery replacement time interval information; A station control system; collecting power data of the energy storage converter and status information of the battery pack in the station, predicting a power change curve of the battery pack in combination with historical data of the battery pack, and transmitting the power change curve of the battery pack; Renewable energy electric control system, which collects power forecast curves of wind power system and photovoltaic system and transmits this information; The dispatching system of thermal power plants collects peak load and frequency regulation requirements and transmits this information; The energy storage management system receives the battery replacement time interval information, the battery pack power change curve, the wind power system and the photovoltaic system power forecast curve, and the peak load and frequency regulation requirements transmitted by the vehicle intelligent monitoring platform, determines and transmits the charging or discharging instructions, and A wind power system and a photovoltaic system; wherein the photovoltaic system is directly connected to the DC bus of the DC / DC parallel connection inside the energy storage converter with direct current; and the wind power system is connected to the AC bus on the low-voltage side of the main transformer after AC boosting.

2. The battery swap station according to claim 1, characterized in that: The battery swap station also includes an external power supply; the external power supply includes power from a thermal power station, a wind power system and a photovoltaic system, wherein the wind power system and the photovoltaic system are connected to the high-voltage side of the main transformer of the battery swap station through a renewable energy transformer as a supplementary power source; the power from the thermal power station is directly connected to the high-voltage side of the main transformer of the battery swap station.

3. A battery swap station with energy storage function, characterized in that: At least several energy storage converters are included, each of which is independently in a charging or discharging state; the voltage level of the AC side of the energy storage converter is equivalent to the voltage level of the low-voltage side of the main transformer of the power exchange station; a single energy storage converter includes several branch DC / DC converters; each battery pack is connected to one of the DC / DC converters, converted into a constant voltage and then connected in parallel, and finally merged into the energy storage converter for inversion; The power consumption system in the station is connected to the low voltage side of the main transformer through the transformer in the station; It includes energy management system, lighting and heating system, and power exchange mechanism; The energy management system comprises: A vehicle intelligent monitoring platform collects vehicle status data and combines it with historical vehicle operation data to analyze and predict vehicle battery replacement time interval information, and transmits the battery replacement time interval information; A station control system; collecting power data of the energy storage converter and status information of the battery pack in the station, predicting a power change curve of the battery pack in combination with historical data of the battery pack, and transmitting the power change curve of the battery pack; Renewable energy electric control system, which collects power forecast curves of wind power system and photovoltaic system and transmits this information; The dispatching system of thermal power plants collects peak load and frequency regulation requirements and transmits this information; The energy storage management system receives the battery replacement time interval information, the battery pack power change curve, the wind power system and the photovoltaic system power forecast curve, and the peak load and frequency regulation requirements transmitted by the vehicle intelligent monitoring platform, and determines and transmits charging or discharging instructions; and External power supply; the external power supply includes power from a thermal power plant, a wind power system and a photovoltaic system, wherein the wind power system and the photovoltaic system are connected to the high-voltage side of the main transformer of the battery swap station through a renewable energy transformer as a supplementary power supply; the power from the thermal power plant is directly connected to the high-voltage side of the main transformer of the battery swap station.

4. The battery swap station according to claim 3, characterized in that: The battery swap station also includes a wind power system and a photovoltaic system; wherein the photovoltaic system is directly connected to the DC bus after the DC / DC parallel connection inside the energy storage inverter with direct current; and the wind power system is connected to the AC bus on the low-voltage side of the main transformer after AC boosting.

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