Energy storage and emergency power supply system for new energy electric vehicle intelligent charging parking garage

Abstract

The present invention discloses an energy storage and emergency power supply system for a new energy electric vehicle intelligent charging parking garage, including: an energy storage module, which uses an energy storage battery pack that can perform charge and discharge cycles, and the energy storage battery pack is electrically connected to a DC bus through a bidirectional DC conversion device to achieve storage and release of electric energy; a charging module, which includes a plurality of independent intelligent charging piles, each of which is connected to the DC bus, and the intelligent charging pile has an interface for communication connection with the electric vehicle, and can automatically adjust the charging power and charging mode according to the battery parameters of the electric vehicle. The energy storage and emergency power supply system of the present invention can effectively alleviate the impact of electric vehicle charging on the power grid, and by storing electric energy during the low power consumption period and releasing electric energy during the peak period, it plays the role of peak shaving and valley filling, and improves the stability and power quality of the power grid.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy electric vehicle charging, and in particular to an energy storage and emergency power supply system for a new energy electric vehicle intelligent charging parking garage. Background Art

[0002] As the world pays more attention to environmental protection and sustainable energy development, new energy electric vehicles have been rapidly promoted and applied. However, the large-scale popularization of electric vehicles has brought many challenges to the charging infrastructure.

[0003] On the one hand, when a large number of electric vehicles are charged together, especially during peak hours of electricity consumption, it will have a huge impact on the power grid, which may cause problems such as grid voltage fluctuations and overloads, affecting the safe and stable operation of the grid.

[0004] On the other hand, existing charging parking garages generally lack effective energy storage methods and cannot fully utilize the difference in peak and valley electricity prices to store and optimize the use of electricity, resulting in energy waste and increased charging costs. In addition, in the event of a sudden power outage, the electric vehicle charging equipment in the garage and key equipment such as lighting, ventilation, and fire protection cannot operate normally, which not only brings great inconvenience to users, but may also cause safety accidents, such as damage to electric vehicle batteries due to charging interruptions and difficulty in evacuating people in the garage. Therefore, it is of great practical significance to develop a new energy electric vehicle intelligent charging parking garage system with energy storage and emergency power supply functions. Summary of the invention

[0005] The purpose of the present invention is to solve the problems in the background technology and to propose an energy storage and emergency power supply system for a new energy electric vehicle intelligent charging parking garage.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention proposes an energy storage and emergency power supply system for a new energy electric vehicle intelligent charging parking garage, comprising:

[0008] The energy storage module uses a storage battery pack that can be charged and discharged. The storage battery pack is electrically connected to the DC bus through a bidirectional DC conversion device to achieve storage and release of electrical energy.

[0009] A charging module, comprising a plurality of independent intelligent charging piles, each of which is connected to the DC bus, and the intelligent charging pile has an interface for communication with the electric vehicle, and can automatically adjust the charging power and charging mode according to the battery parameters of the electric vehicle, and monitor the charging current, voltage and temperature information in real time during the charging process, and transmit the monitoring data to the control system;

[0010] The emergency power supply switching module is used to quickly connect the energy storage module with the key electrical equipment in the garage and the electric vehicles being charged to form an emergency power supply circuit when the power supply of the power grid is interrupted. The module contains a fast switching switch and an intelligent control circuit. The switching time is less than the preset threshold to ensure the continuity of power supply.

[0011] The control system receives various signals from the charging module, energy storage module and power grid, including information such as power, voltage, current, and equipment operating status, and controls the bidirectional DC conversion device based on preset algorithms and strategies to achieve intelligent optimization and allocation of electric energy between the power grid, energy storage module and charging module, while remotely monitoring and functional testing the emergency power supply switching module;

[0012] The intelligent monitoring and management platform establishes a communication link with the control system through a wired or wireless network to achieve remote monitoring and management functions. It allows users to access the platform through mobile terminals or computer terminals to view information such as the status of charging equipment, the power level of the energy storage module, and the power supply status of the power grid. It has the functions of appointment charging, charging fee settlement, and fault alarm prompts, and can generate charging volume statistics reports, electricity expenditure statistics reports, and equipment failure rate statistics reports for garage managers.

[0013] Preferably, the energy storage battery pack is a lithium-ion battery pack or other new energy storage batteries with high energy density, long cycle life and fast charge and discharge performance.

[0014] Preferably, the charging mode of the smart charging pile includes one or more combinations of constant current charging, constant voltage charging and pulse charging modes, and can dynamically adjust the charging power between 82% and 96% of the rated power according to the remaining power, temperature and health status of the electric vehicle battery, where 82 and 96 are power adjustment range values ​​set according to battery characteristics.

[0015] Preferably, the switching time of the emergency power supply switching module is less than 50 milliseconds, and the fast switching switch is a static switch based on power electronic devices or an electromagnetic switch with fast mechanical action and electrical isolation performance.

[0016] Preferably, when the power grid is in a low-power consumption period and the electricity price is lower than a preset threshold, the control system controls the energy storage module to charge at no more than 64% of its rated charging current to balance the energy storage efficiency and battery life, wherein 64 is a current limit ratio value determined based on the battery charging characteristics; when the power grid is in a tight supply period or the power consumption is at a peak and the charging demand is strong, the energy storage module is controlled to discharge to supplement electricity so that the sum of the total power consumption of the garage and the power supply of the power grid is maintained within the tolerable range of the power grid.

[0017] Preferably, the intelligent monitoring and management platform can provide users with personalized charging plan recommendations based on their historical charging behaviors and preferences. If an abnormal situation is detected during the charging process, in addition to sending alarm information to users and managers, it can also automatically adjust charging parameters or suspend charging operations according to preset emergency handling rules to ensure safety.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The energy storage and emergency power supply system of the present invention can effectively alleviate the impact of electric vehicle charging on the power grid by storing electric energy during low-power consumption periods and releasing electric energy during peak periods, thereby playing the role of peak-shaving and valley-filling, and improving the stability of the power grid and the quality of power.

[0020] 2. It has an emergency power supply function. When the power grid is out of power, it can quickly switch to provide power for key equipment and electric vehicles in the garage, ensuring the safety of personnel and the normal operation of equipment, and avoiding losses and inconveniences caused by power outages.

[0021] 3. The intelligent monitoring and management platform provides users and managers with a convenient operation interface and rich functions, improves the quality of charging services and the efficiency of operation management, and promotes the intelligent development of new energy electric vehicle charging facilities.

[0022] 4. The entire system adopts advanced energy storage technology, charging technology and intelligent control technology, has high energy utilization efficiency and reliability, and can adapt to the application scenarios of new energy electric vehicle smart charging parking garages of different scales and needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a system block diagram of the energy storage and emergency power supply system for the new energy electric vehicle intelligent charging parking garage proposed by the present invention. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] Reference Figure 1 , Energy storage and emergency power supply system for new energy electric vehicle intelligent charging parking garage, Energy storage module:

[0026] Using high-performance lithium-ion battery packs or other new energy storage batteries, these batteries have high energy density, long cycle life and fast charging and discharging characteristics, and can effectively store large amounts of electrical energy.

[0027] The energy storage battery pack is connected to the DC bus through a bidirectional DC converter. The bidirectional DC converter can realize the bidirectional flow of electric energy between the battery pack and the DC bus, that is, when the power supply of the grid is sufficient and the electricity price is low, the grid power is converted into DC power suitable for charging the battery pack, and the battery pack is charged and stored; when the power demand is peak or the grid fails, the DC power stored in the battery pack can be converted into DC voltage and current that meet the system requirements, and power is supplied to the electrical equipment and electric vehicles in the garage through the DC bus.

[0028] Charging module:

[0029] It includes multiple independent smart charging piles, each of which is connected to the DC bus to obtain electrical energy to charge electric vehicles.

[0030] The smart charging pile has an interface for communication with electric vehicles, and can use CAN bus communication protocol or wireless communication technology (such as Bluetooth, Wi-Fi, etc.) to interact with the battery management system (BMS) of electric vehicles. Through this communication connection, the smart charging pile can obtain the battery parameters of the electric vehicle in real time, such as battery capacity, remaining power, battery temperature, battery health status (such as internal resistance, etc.). Based on these parameters, the smart charging pile can automatically select the appropriate charging mode, such as constant current charging, constant voltage charging, pulse charging mode or a combination thereof. For example, when the battery power of the electric vehicle is low, the constant current charging mode is used to quickly increase the power; when the power is close to full, it switches to constant voltage charging mode to protect the battery; in certain specific cases, the pulse charging mode can be used to activate the battery plate and improve battery performance. In addition, the smart charging pile can dynamically adjust the charging power according to the battery status, and its adjustment range can vary between 82% and 96% of the rated power. For example, when the battery temperature is high, the charging power is appropriately reduced to prevent overheating; when the battery health status is poor, the charging power will also be reduced accordingly to extend the battery life. During the charging process, the smart charging pile also monitors the charging current, voltage and temperature information in real time, and transmits this monitoring data to the control system so that the control system can comprehensively monitor and manage the entire charging process.

[0031] Emergency power supply switching module:

[0032] This module plays a key role when the power supply of the power grid is interrupted. It can quickly form an emergency power supply circuit between the energy storage module and the key electrical equipment in the garage and the electric vehicles being charged.

[0033] The module includes a fast switching switch and an intelligent control circuit. The fast switching switch can be a static switch based on power electronic devices (such as IGBT, MOSFET, etc.), which has the advantages of fast response speed, no mechanical wear, and smooth switching process; or an electromagnetic switch with fast mechanical action and electrical isolation performance, such as a vacuum circuit breaker, etc. The intelligent control circuit is responsible for monitoring the power supply status of the power grid. Once a power outage is detected (for example, by monitoring the power grid voltage falling below a preset threshold), the fast switching switch is immediately controlled to disconnect from the power grid in a very short time (switching time is less than 50 milliseconds), and the energy storage module is connected to the power supply circuit to provide continuous and stable power supply for the lighting system, ventilation system, fire-fighting equipment and charging electric vehicles in the garage, ensuring the safety of personnel and the normal operation of equipment, and avoiding losses and inconveniences caused by power outages.

[0034] Control system:

[0035] As the core control unit of the entire system, the control system receives various signals from the charging module, energy storage module and power grid, including information such as power, voltage, current, and equipment operating status. For example, it obtains real-time power supply voltage, current and power information from the power grid, obtains information such as battery power, voltage, temperature, and charge and discharge current of the battery pack from the energy storage module, and obtains the working status, charging parameters, and communication data of each smart charging pile from the charging module.

[0036] Based on the preset algorithms and strategies, the control system precisely controls the bidirectional DC converter to achieve intelligent optimization and allocation of electric energy between the power grid, energy storage module and charging module. For example, when the power grid is in a low-power period and the electricity price is lower than the preset threshold, the control system will control the bidirectional DC converter to charge at no more than 64% of the rated charging current of the battery pack according to the remaining power and health status of the battery pack, ensuring energy storage efficiency while taking into account the battery life. When the power supply of the power grid is tight or the power consumption is at a peak and the charging demand is strong, the control system controls the energy storage module to discharge and supplement the power. By real-time monitoring of the total power consumption of the garage and the power supply power of the power grid, the sum of the two is maintained within the acceptable range of the power grid, thereby effectively alleviating the impact of electric vehicle charging on the power grid, playing a role in peak shaving and valley filling, and improving the stability and power quality of the power grid. In addition, the control system also remotely monitors and functionally tests the emergency power supply switching module, regularly checks the status of the fast switching switch and the reliability of the intelligent control circuit, and ensures that the emergency power supply switching module can work normally at critical moments.

[0037] Intelligent monitoring and management platform:

[0038] By establishing a communication link with the control system through a wired or wireless network, remote monitoring and management functions can be realized. Users can access the platform through mobile terminals (such as mobile phone applications) or computer terminals to view information such as the status of charging equipment, the power of energy storage modules, and the power supply status of the power grid. For example, users can know in real time whether each smart charging pile is idle, the charging progress of the electric vehicle being charged (including the amount charged, the remaining charging time, etc.), and the remaining power percentage of the energy storage battery pack in the garage.

[0039] The platform has a reservation charging function. Users can set parameters such as charging time and charging power in advance. The system will make intelligent arrangements based on the user's reservation information and the power resources in the garage. In terms of charging fee settlement, the platform can accurately calculate the charging fee based on the user's charging power, charging time and the current electricity price information, and provide a variety of payment methods, such as online payment, prepayment, etc. At the same time, the platform has a fault alarm prompt function. Once any device in the system fails, such as a smart charging pile failure, an abnormal energy storage module, or a power grid power outage, the platform will immediately send an alarm message to the user and the garage manager, including detailed information such as the fault type and fault location. In addition, the platform can also generate charging quantity statistics, electricity expenditure statistics, and equipment failure rate statistics for garage managers. These reports help managers make operational management decisions, such as reasonably arranging equipment maintenance plans, optimizing power resource allocation, and formulating charging strategies. In addition, the platform can provide users with personalized charging plan recommendations based on their historical charging behavior and preferences. For example, for users who often charge at night, it is recommended that they charge during the period with the lowest electricity price, and provide the most suitable charging mode and power setting recommendations based on the battery characteristics and usage habits of their electric vehicles. If an abnormal situation is detected during the charging process, in addition to sending alarm information to users and managers, the platform can also automatically adjust charging parameters or suspend charging operations according to preset emergency handling rules to ensure safety.

[0040] (II) System working principle

[0041] Normal charging working mode:

[0042] When the power grid is supplying power normally, the control system first determines whether the energy storage battery pack needs to be charged based on the current electricity price information and the power status of the energy storage module. If it is during the off-peak period and the electricity price is low, and the energy storage battery pack is not fully charged, the control system starts the bidirectional DC conversion device to convert the AC power of the grid into DC power, and charges the energy storage battery pack with the appropriate charging current and voltage.

[0043] When an electric car enters the garage and connects to the smart charging pile, the smart charging pile communicates with the electric car's BMS to obtain battery parameter information. Then, the smart charging pile automatically selects the appropriate charging mode and initial charging power based on this information, and sends a charging request to the control system. After the control system approves it, the smart charging pile starts charging the electric car. During the charging process, the smart charging pile monitors parameters such as charging current, voltage, and temperature in real time, and transmits this data to the control system. The control system dynamically adjusts the charging power of the smart charging pile based on this data and the power demand of the entire garage to ensure that the charging process is safe, efficient, and does not cause excessive impact on the power grid.

[0044] At the same time, the energy storage module is in standby mode, and its power and status information are also monitored in real time by the control system. If there is a short-term fluctuation in the power supply of the grid or a sudden increase in power demand, the control system can call on the energy storage module to release power in a timely manner according to the preset strategy to supplement the insufficient power supply of the grid to maintain the stability of the power supply in the garage.

[0045] Emergency power supply working mode:

[0046] The emergency power supply switching module is always in a working state of monitoring the power supply status of the power grid. When the power grid is out of power, the intelligent control circuit of the emergency power supply switching module quickly detects that the grid voltage drops below the preset threshold, and immediately sends a control signal to drive the fast switching switch to operate. The fast switching switch disconnects from the grid in a very short time (less than 50 milliseconds) and connects the energy storage module to the power supply circuit in the garage. At this time, the energy storage module begins to provide power supply for key electrical equipment in the garage (such as lighting systems, ventilation systems, fire-fighting equipment, etc.) and electric vehicles being charged.

[0047] During the emergency power supply period, the control system will closely monitor the power consumption of the energy storage module. When the power is lower than the set threshold, the control system will take corresponding measures, such as limiting the power consumption of non-critical equipment (for example, reducing the brightness of some lighting, reducing ventilation, etc.), giving priority to ensuring the basic power needs of critical equipment and electric vehicles being charged. At the same time, the platform will send low power alarm information to users and garage managers, reminding users to end charging as soon as possible or take other countermeasures to extend the emergency power supply time and ensure the safety of personnel and the basic operation of equipment.

[0048] Intelligent monitoring and management working mode:

[0049] The intelligent monitoring and management platform obtains the operating status and related data information of each device in the system in real time through communication connection with the control system. Users can log in to the platform through mobile terminals or computer terminals and view the information of interest at any time, such as the availability of charging equipment, charging progress, fee details, etc. Users can also make appointments for charging operations on the platform and plan their charging plans in advance.

[0050] For garage managers, the platform can automatically generate various statistical reports, such as daily, weekly, and monthly charging statistics, which can directly reflect the garage's charging business volume; electricity expenditure statistics, which can help managers analyze electricity costs and optimize electricity use strategies; equipment failure rate statistics, which can help managers promptly discover equipment problems, arrange repairs and maintenance work, and improve equipment reliability and service life. In addition, the platform's fault alarm function can ensure that managers are informed of system fault information as soon as possible, take timely countermeasures, and reduce the impact of faults on garage operations.

[0051] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. The energy storage and emergency power supply system of the new energy electric vehicle intelligent charging parking garage is characterized by: include: The energy storage module uses a storage battery pack that can be charged and discharged. The storage battery pack is electrically connected to the DC bus through a bidirectional DC conversion device to achieve storage and release of electrical energy. A charging module, comprising a plurality of independent intelligent charging piles, each of which is connected to the DC bus, and the intelligent charging pile has an interface for communication with the electric vehicle, and can automatically adjust the charging power and charging mode according to the battery parameters of the electric vehicle, and monitor the charging current, voltage and temperature information in real time during the charging process, and transmit the monitoring data to the control system; The emergency power supply switching module is used to quickly connect the energy storage module with the key electrical equipment in the garage and the electric vehicles being charged to form an emergency power supply circuit when the power supply of the power grid is interrupted. The module contains a fast switching switch and an intelligent control circuit. The switching time is less than the preset threshold to ensure the continuity of power supply. The control system receives various signals from the charging module, energy storage module and power grid, including information such as power, voltage, current, and equipment operating status, and controls the bidirectional DC conversion device based on preset algorithms and strategies to achieve intelligent optimization and allocation of electric energy between the power grid, energy storage module and charging module, while remotely monitoring and functional testing the emergency power supply switching module; The intelligent monitoring and management platform establishes a communication link with the control system through a wired or wireless network to achieve remote monitoring and management functions. It allows users to access the platform through mobile terminals or computer terminals to view information such as the status of charging equipment, the power level of the energy storage module, and the power supply status of the power grid. It has the functions of appointment charging, charging fee settlement, and fault alarm prompts, and can generate charging volume statistics reports, electricity expenditure statistics reports, and equipment failure rate statistics reports for garage managers.

2. The energy storage and emergency power supply system for the new energy electric vehicle intelligent charging parking garage according to claim 1 is characterized in that: The energy storage battery pack is a lithium-ion battery pack or other new energy storage batteries with high energy density, long cycle life and fast charge and discharge performance.

3. The energy storage and emergency power supply system for the new energy electric vehicle intelligent charging parking garage according to claim 1 is characterized in that: The charging modes of the smart charging pile include one or more combinations of constant current charging, constant voltage charging and pulse charging modes, and can dynamically adjust the charging power between 82% and 96% of the rated power according to the remaining power, temperature and health status of the electric vehicle battery, where 82 and 96 are power adjustment range values ​​set according to battery characteristics.

4. The energy storage and emergency power supply system for the new energy electric vehicle intelligent charging parking garage according to claim 1 is characterized in that: The switching time of the emergency power supply switching module is less than 50 milliseconds, and the fast switching switch is a static switch based on power electronic devices or an electromagnetic switch with fast mechanical action and electrical isolation performance.

5. The energy storage and emergency power supply system for the new energy electric vehicle intelligent charging parking garage according to claim 2 is characterized in that: The control system controls the energy storage module to charge at no more than 64% of its rated charging current to balance energy storage efficiency and battery life when the power grid is in a low-power consumption period and the electricity price is lower than a preset threshold, wherein 64 is a current limit ratio value determined based on the battery charging characteristics; when the power grid is in a tight supply period or the power consumption is at a peak and the charging demand is strong, the control system controls the energy storage module to discharge to supplement power so that the sum of the total power consumption of the garage and the power supply of the power grid is maintained within the tolerable range of the power grid.

6. The energy storage and emergency power supply system for the new energy electric vehicle intelligent charging parking garage according to claim 1 is characterized in that: The intelligent monitoring and management platform can provide users with personalized charging plan recommendations based on their historical charging behaviors and preferences. If an abnormal situation is detected during the charging process, in addition to sending alarm information to users and managers, it can also automatically adjust charging parameters or suspend charging operations according to preset emergency handling rules to ensure safety.

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