Multi-source mobile energy storage device and control method thereof

Abstract

The invention discloses a multi-source mobile energy storage device and a control method thereof. The energy storage device comprises a vehicle body; the multi-source power supply system is arranged on the vehicle body, the multi-source power supply system comprises a photovoltaic power generation unit, an energy storage unit and a mains supply input unit, and the photovoltaic power generation unit and the mains supply input unit are electrically connected with the energy storage unit. According to the multi-source mobile energy storage device, three power supply units of photovoltaic power generation, energy storage and commercial power input are integrated on the vehicle body, and the energy management system is adopted to control switching of power supply modes in real time based on photovoltaic output power, commercial power access state and energy storage residual electric quantity, so that stable and continuous power supply of mobile charging equipment is realized. The device preferentially utilizes photovoltaic power supply and can be automatically switched to a commercial power supply mode or an energy storage power supply mode according to actual conditions, the technical problem that power supply is unstable due to the fact that an existing mobile charging vehicle excessively depends on an energy storage battery is effectively solved, and meanwhile the limitation that fixed charging facilities are not evenly distributed is overcome through the mobile characteristic of the mobile charging vehicle.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage systems, and in particular to a multi-source mobile energy storage device and a control method thereof. Background Art

[0002] With the rapid development of new energy technologies, the market demand for electric vehicles continues to grow. However, the current uneven distribution of charging infrastructure and insufficient charging equipment have restricted the popularization of electric vehicles. To solve this problem, mobile charging vehicles have emerged on the market. However, existing mobile charging vehicles still have technical limitations: current mobile charging vehicles mainly rely on energy storage batteries for power supply, making it difficult to provide stable and continuous charging services. Summary of the invention

[0003] The main purpose of the present invention is to provide a multi-source mobile energy storage device and a control method thereof to solve the above technical problems.

[0004] In a first aspect, the present invention provides a multi-source mobile energy storage device, comprising:

[0005] Vehicle body;

[0006] A multi-source power supply system is arranged on the vehicle body, the multi-source power supply system comprises a photovoltaic power generation unit, an energy storage unit and a mains power input unit, the photovoltaic power generation unit and the mains power input unit are electrically connected to the energy storage unit respectively;

[0007] An energy conversion system, electrically connected to the multi-source power supply system, for converting the output electric energy of the photovoltaic power generation unit, the energy storage unit and the mains input unit into electric energy of preset specifications;

[0008] a charging output interface, electrically connected to the energy conversion system; and

[0009] An energy management system is electrically connected to the photovoltaic power generation unit, the energy storage unit, the mains input unit and the energy conversion system, respectively, and is used for:

[0010] Based on the output power of the photovoltaic power generation unit, the access status of the mains input unit and the remaining power of the energy storage unit, control is performed to switch between the photovoltaic power supply mode, the mains power supply mode and the energy storage power supply mode.

[0011] Wherein, the energy storage unit includes: an energy storage inverter, a battery pack and a battery management system.

[0012] Among them, it also includes: a cooling system, which includes at least one of a liquid cooling circuit and an air cooling device, for adjusting the operating temperature of the battery pack.

[0013] The energy conversion system includes: a DC-DC converter for the photovoltaic power generation unit, an AC-DC converter for the mains input unit, and an inverter for the charging output interface.

[0014] Wherein, the photovoltaic power generation unit is a photovoltaic panel arranged on the top of the vehicle body; the charging output interface includes a plurality of charging output ports.

[0015] In a second aspect, the present invention further provides a control method for a multi-source mobile energy storage device, comprising:

[0016] Collecting energy status parameters, wherein the energy status parameters include the output power of the photovoltaic power generation unit, the access status of the mains input unit, and the remaining power of the energy storage unit;

[0017] According to the target power supply and the energy state parameters, the following are executed in sequence according to the preset priorities:

[0018] When the output power of the photovoltaic power generation unit is greater than or equal to the target power supply power, controlling the photovoltaic power generation unit to supply power to the charging output interface;

[0019] When the output power of the photovoltaic power generation unit is less than the target power supply power and the mains input unit is in a connected state, controlling the mains input unit to supply power to the charging output interface;

[0020] When the output power of the photovoltaic power generation unit is less than the target power supply power and the mains input unit is in a disconnected state, controlling the energy storage unit to supply power to the charging output interface;

[0021] During the process of the energy storage unit supplying power to the charging output interface, the remaining power of the energy storage unit is monitored, and when the remaining power is lower than a preset threshold, an alarm signal is output.

[0022] Wherein, before the control method is performed according to the target power supply power and the energy state parameter, the control method further includes:

[0023] Setting a reference power PB according to specification parameters of the charging output interface;

[0024] According to the preset margin coefficient α and the reference power PB, the target power supply power PT is calculated:

[0025] PT = PB × (1 + α);

[0026] The margin coefficient α is used to compensate for the loss during the power supply process.

[0027] Wherein, after controlling the photovoltaic power generation unit to supply power to the charging output interface, the control method further includes:

[0028] Detecting the real-time output power P1 of the photovoltaic power generation unit and the real-time load power P2 of the charging output interface;

[0029] When P1 is greater than P2, calculate the surplus power ΔP:

[0030] ΔP=P1-P2×(1+β), where β is the loss coefficient;

[0031] Determining whether the remaining capacity of the energy storage unit is less than a preset charging cut-off threshold;

[0032] When the remaining capacity of the energy storage unit is less than the charging cut-off threshold, the electric energy corresponding to the surplus power is stored in the energy storage unit.

[0033] The starting method of the control method includes:

[0034] Receive a mode selection instruction input by the user to start; or

[0035] Receive the preset power supply strategy and start automatically.

[0036] Beneficial technical effects of the present invention: The multi-source mobile energy storage device integrates three power supply units, namely photovoltaic power generation, energy storage and mains input, on the vehicle body, and uses an energy management system to control the switching of power supply modes in real time based on photovoltaic output power, mains access status and remaining energy storage capacity, thereby achieving stable and continuous power supply for mobile charging equipment. The device gives priority to photovoltaic power supply and can automatically switch to mains power supply or energy storage power supply mode according to actual conditions, effectively solving the technical problem of unstable power supply caused by excessive reliance on energy storage batteries in existing mobile charging vehicles. At the same time, its mobile characteristics also overcome the limitation of uneven distribution of fixed charging facilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0038] Figure 1 A schematic diagram of the architecture of a multi-source mobile energy storage device provided by an embodiment of the present invention;

[0039] Figure 2 A schematic diagram of a multi-source power supply system architecture of a multi-source mobile energy storage device provided in an embodiment of the present invention;

[0040] Figure 3 A three-dimensional schematic diagram of a multi-source mobile energy storage device provided in an embodiment of the present invention;

[0041] Figure 4 A three-dimensional schematic diagram of a multi-source mobile energy storage device provided in an embodiment of the present invention;

[0042] Figure 5 A schematic flow chart of a control method for a multi-source mobile energy storage device provided by an embodiment of the present invention;

[0043] Figure 6 A schematic diagram of a target power supply flow chart of a control method for a multi-source mobile energy storage device provided in an embodiment of the present invention;

[0044] Figure 7 A schematic diagram of a photovoltaic surplus power generation process flow of a control method for a multi-source mobile energy storage device provided in an embodiment of the present invention.

[0045] Description of reference numerals:

[0046] In the figure: 10 - vehicle body, 11 - wheeled walking mechanism, 20 - multi-source power supply system, 21 - photovoltaic power generation unit, 22 - energy storage unit, 23 - mains power input unit, 30 - energy conversion system, 40 - charging output interface, 50 - energy management system. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0049] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0050] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0051] Please also refer to Figure 1-Figure 4 ,in Figure 1 A schematic diagram of the architecture of a multi-source mobile energy storage device provided by an embodiment of the present invention; Figure 2 A schematic diagram of a multi-source power supply system architecture of a multi-source mobile energy storage device provided in an embodiment of the present invention; Figure 3 A three-dimensional schematic diagram of a multi-source mobile energy storage device provided in an embodiment of the present invention;

[0052] Figure 4 A three-dimensional schematic diagram of a multi-source mobile energy storage device provided in an embodiment of the present invention. The multi-source mobile energy storage device provided in an embodiment of the present invention includes: a vehicle body 10; a multi-source power supply system 20, which is arranged on the vehicle body 10, and the multi-source power supply system 20 includes a photovoltaic power generation unit 21, an energy storage unit 22 and a mains input unit 23, and the photovoltaic power generation unit 21 and the mains input unit 23 are electrically connected to the energy storage unit 22 respectively; an energy conversion system 30, which is electrically connected to the multi-source power supply system 20, and is used to convert the output electric energy of the photovoltaic power generation unit 21, the energy storage unit 22 and the mains input unit 23 into electric energy of preset specifications; a charging output interface 40, which is electrically connected to the energy conversion system 30; and an energy management system 50, which is electrically connected to the photovoltaic power generation unit 21, the energy storage unit 22, the mains input unit 23 and the energy conversion system 30 respectively, and the energy management system 50 is used to: based on the output power of the photovoltaic power generation unit 21, the access status of the mains input unit 23 and the remaining power of the energy storage unit 22, control the switching of the photovoltaic power supply mode, the mains power supply mode and the energy storage power supply mode.

[0053] In this embodiment, the multi-source power supply system 20 realizes power supply by integrating a photovoltaic power generation unit 21, an energy storage unit 22 and a mains input unit 23. The photovoltaic power generation unit 21 is installed on the roof of the vehicle to collect solar energy and convert it into electrical energy. The energy storage unit 22 is used to store electrical energy from photovoltaic power and mains power; the mains input unit 23 is used to charge the electric vehicle or battery pack through the mains power when the photovoltaic power generation is insufficient or the on-board battery power is low.

[0054] The energy conversion system 30 is used to convert the direct current generated by the photovoltaic power generation unit 21 into the direct current required by the energy storage unit 22 or the electric vehicle. It can also convert the mains power (alternating current) into direct current to charge the energy storage unit 22 or the electric vehicle. At the same time, it can convert the direct current of the energy storage unit 22 into alternating current or direct current suitable for charging the electric vehicle.

[0055] The energy management system 50 dynamically adjusts the energy distribution strategy, gives priority to the use of photovoltaic energy, and automatically switches the power supply unit according to the access status of the mains input unit 23 and the remaining power of the energy storage unit 22.

[0056] In this embodiment, the photovoltaic power generation unit 21 generates direct current under sunlight conditions, and the photovoltaic power is converted and stored in the energy storage unit 22 through a DC-DC converter, or directly used to charge the electric vehicle. When the power generation of the photovoltaic power generation unit 21 is not enough to meet the demand, the mains power is connected through the mains input unit 23, and the mains power is converted into direct current through an AC-DC converter, and then stored in the photovoltaic power generation unit 21, or directly used to charge the electric vehicle. The energy storage unit 22 stores electrical energy from the photovoltaic power generation unit 21 and the mains input unit 23. Through this multi-source power supply method, flexible and continuous power supply capabilities can be achieved in different environments, while improving the utilization rate of photovoltaic energy and ensuring that the charging needs of electric vehicles are met.

[0057] In a specific embodiment, the multi-source power supply system 20 includes a photovoltaic power generation unit 21, an energy storage unit 22 and a mains input unit 23. Among them: the photovoltaic power generation unit 21 adopts a high-efficiency monocrystalline silicon photovoltaic module with a peak power of not less than 5kW, is installed on the roof, and is electrically connected to the energy storage unit 22. The installation inclination angle of the photovoltaic module can be adjusted within the range of 0 to 15° to adapt to the solar incidence angle in different regions. The energy storage unit 22 adopts a lithium iron phosphate battery pack, and the battery pack adopts a modular design for easy maintenance and replacement. The mains input unit 23 is arranged on the side of the vehicle body 10, including a three-phase AC input interface and a single-phase AC input interface. The mains input unit 23 is electrically connected to the energy storage unit 22 through a dedicated cable.

[0058] In a specific embodiment, the vehicle body 10 adopts a movable box-type structure and is equipped with a wheeled walking mechanism 11. The top area of ​​the vehicle body 10 is divided into two functional areas as a whole: the energy storage area is located at the rear of the vehicle body 10, mainly used to install the energy storage unit 22; the electrical equipment area is located at the front of the vehicle body 10, used to arrange the energy conversion system 30 and the energy management system 50 and the mains input unit 23. The photovoltaic power generation unit 21 is arranged above the energy storage area and the electrical equipment area.

[0059] In a specific embodiment, the energy management system 50 is a control system for the energy storage device, using an industrial-grade programmable logic controller (PLC) as the main controller and equipped with a 7-inch color touch screen as a human-computer interaction interface. The energy management system 50 monitors the following parameters in real time: the real-time output power of the photovoltaic power generation unit 21, the access status and input power of the mains input unit 23, the remaining power (State of Charge, SOC) of the energy storage unit 22, the temperature and other state parameters.

[0060] Based on the above parameters, the energy management system 50 can realize switching between three power supply modes: photovoltaic power supply mode: photovoltaic power generation output is used first, and the remaining electric energy is stored in the energy storage unit 22; AC power supply mode: it is enabled when photovoltaic power generation is insufficient and there is AC power access, and it can charge the user and the energy storage unit 22 at the same time; Energy storage power supply mode: it is enabled when there is no photovoltaic power generation and AC power input, and the energy storage unit 22 is used to provide charging services for users.

[0061] In a more specific embodiment, the energy management system 50 sets the following switching strategy: when the photovoltaic power generation power>1kW, the photovoltaic power supply mode is entered first; when the energy storage unit 22SOC<20% and there is a mains connection, it is forced to switch to the mains power supply mode; when there is no mains connection and the photovoltaic power generation power<1kW, it automatically switches to the energy storage power supply mode. Through this design, the multi-source mobile energy storage device can flexibly switch between different power supply modes according to environmental conditions, which can maximize the use of clean energy and ensure continuous and stable power supply.

[0062] In one embodiment, the energy storage unit 22 includes: an energy storage inverter, a plurality of battery packs, and a battery management system (not shown in the drawings).

[0063] In this embodiment, the energy storage converter has a bidirectional energy flow capability, which can realize the charging and discharging process of the energy storage unit 22. The battery pack adopts a modular design, and a total of 8 independent battery pack units are arranged. The battery management system (Battery Management System, BMS) monitors the status of the battery pack unit, prevents overcharging and over-discharging, and ensures the safe and efficient operation of the battery pack unit. Through the above design, the energy storage unit 22 can realize safe and reliable energy storage and conversion functions, and provide stable power support for external loads such as vehicles.

[0064] In one embodiment, it further includes: a cooling system, the cooling system includes at least one of a liquid cooling circuit and an air cooling device, which is used to adjust the operating temperature of the battery pack.

[0065] In this embodiment, in order to maintain the optimal operating temperature of the battery pack, a dual cooling solution combining liquid cooling and air cooling is adopted: the liquid cooling circuit includes a water pump, a radiator, a circulation pipeline and a temperature control valve (not shown in the drawings). The circulation pipeline adopts an aluminum alloy pipe with an inner diameter of 12 mm, which runs through each battery pack unit. The rated flow rate of the water pump is 20L / min, which can realize the forced circulation of the coolant. The radiator is installed at the rear of the vehicle body 10. The temperature control valve can automatically adjust the coolant flow rate according to the temperature of the battery pack unit, so that the temperature of the battery pack unit is maintained within the optimal working range of 15 to 35°C.

[0066] The air cooling device consists of multiple groups of axial flow fans and is powered by 24V DC. The fans are evenly arranged around the battery pack unit to form forced convection heat dissipation. The temperature of the battery pack unit is monitored in real time through the temperature sensor near the battery pack. When the temperature exceeds 40℃, the air cooling device is automatically started.

[0067] In one embodiment, the energy conversion system 30 is electrically connected to the photovoltaic power generation unit 21, the energy storage unit 22 and the mains input unit 23, respectively, and the energy conversion system 30 includes a DC-DC converter for the photovoltaic power generation unit 21, an AC-DC converter for the mains input unit 23, and an inverter for charging output.

[0068] In this embodiment, the energy conversion system 30 is electrically connected to the multi-source power supply system 20 for converting the form of electric energy. The energy conversion system 30 includes power conversion equipment such as a DC-DC converter, an AC-DC converter, and an inverter, which can convert the output electric energy of different power sources into a voltage level suitable for charging. For example, the inverter converts the DC power in the battery pack into AC or DC power suitable for charging an electric vehicle.

[0069] In one embodiment, the photovoltaic power generation unit 21 is a photovoltaic panel disposed on the top of the vehicle body 10; the charging output interface 40 includes a plurality of charging output ports.

[0070] In this embodiment, the photovoltaic power generation unit 21 adopts a high-efficiency monocrystalline silicon photovoltaic panel assembly, the overall weight of which is controlled within 180kg and is installed on a bracket on the roof. The specific configuration of the charging output interface 40 is as follows: two 200A DC fast charging ports, supporting a maximum charging power of 120kW. Four 32A AC slow charging ports, with a single port power of 7kW. An industrial-grade three-phase AC output port with a rated current of 63A can power industrial equipment. Two household single-phase AC output ports with a rated current of 16A are used for emergency power supply.

[0071] Please also see Figure 5-Figure 7 , Figure 5 A schematic flow chart of a control method for a multi-source mobile energy storage device provided by an embodiment of the present invention; Figure 6 A schematic diagram of a target power supply flow chart of a control method for a multi-source mobile energy storage device provided in an embodiment of the present invention; Figure 7 A schematic diagram of the photovoltaic surplus power generation process of the control method of the multi-source mobile energy storage device provided in an embodiment of the present invention. Corresponding to the above multi-source mobile energy storage device, an embodiment of the present invention also provides a control method of the multi-source mobile energy storage device, which realizes automatic switching of the power supply mode through parameter collection and analysis to ensure continuous and efficient operation of the energy storage device. The control method includes the following steps S100-S204.

[0072] S100 , collecting energy status parameters, where the energy status parameters include the output power of the photovoltaic power generation unit 21 , the access status of the mains input unit 23 , and the remaining power of the energy storage unit 22 .

[0073] In this embodiment, the energy management system 50 (hereinafter referred to as the system) continuously collects energy state parameters, including: the real-time output power of the photovoltaic power generation unit 21 (collected by the photovoltaic controller), which reflects the current photovoltaic power generation capacity; the access status of the mains input unit 23 (determined by the input detection circuit), which is used to determine whether the mains power supply conditions are met; the remaining power of the energy storage unit 22 (obtained through the BMS system), which is used to evaluate the power supply capacity of the energy storage system. The collection frequency of these parameters is once per second to ensure that the system can respond to changes in energy status in a timely manner.

[0074] S200. Execute in sequence according to the preset priority according to the target power supply power and energy status parameters.

[0075] In this embodiment, after acquiring the energy state parameters, the energy management system 50 executes corresponding power supply strategies in order of priority according to the preset target power supply power.

[0076] S201 : When the output power of the photovoltaic power generation unit 21 is greater than or equal to the target power supply power, control the photovoltaic power generation unit 21 to supply power to the charging output interface 40 .

[0077] In this embodiment, the photovoltaic power supply mode is used. When the output power of the photovoltaic power generation unit 21 is greater than or equal to the target power supply power, the photovoltaic power generation unit 21 is preferentially controlled to supply power to the charging output interface 40. For example, if the target power supply power is 30kW, and the current photovoltaic output reaches 35kW, the photovoltaic power supply will be directly used for power supply, and the excess 5kW can be used to charge the energy storage unit 22.

[0078] S202 , when the output power of the photovoltaic power generation unit 21 is less than the target power supply power and the mains power input unit 23 is in the connected state, control the mains power input unit 23 to supply power to the charging output interface 40 .

[0079] In this embodiment, the mains supplementary power supply mode. When the output power of the photovoltaic power generation unit 21 is less than the target power supply power and the mains input unit 23 is in the connected state, the mains input unit 23 will be controlled to supply power to the charging output interface 40. For example, when the photovoltaic power can only provide 20kW and the target power is 30kW, if the mains connection is detected, it will automatically switch to the mains supplementary power supply.

[0080] S203 , when the output power of the photovoltaic power generation unit 21 is less than the target power supply power and the mains input unit 23 is in a disconnected state, controlling the energy storage unit 22 to supply power to the charging output interface 40 .

[0081] In this embodiment, the energy storage emergency power supply mode. When the photovoltaic power generation is insufficient and the city power is not connected, the energy storage unit 22 will be controlled to supply power to the charging output interface 40. This situation usually occurs at night or on rainy days, and the external power grid is unavailable. At this time, the energy storage unit 22 is completely relied on to provide energy.

[0082] S204 , when the energy storage unit 22 supplies power to the charging output interface 40 , monitor the remaining power of the energy storage unit 22 , and output an alarm signal when the remaining power is lower than a preset threshold.

[0083] In this embodiment, when executing the energy storage power supply mode, special attention will be paid to the remaining power of the energy storage unit 22. When the remaining power of the energy storage unit 22 is monitored to be lower than the preset threshold (usually set to 20%), an alarm signal will be output immediately. This alarm signal is divided into two levels: when the remaining power is lower than 20%, a first-level warning is issued to remind the operator to pay attention; when the remaining power is lower than 10%, a second-level alarm is issued, suggesting timely switching of the power supply mode or replenishment of energy storage.

[0084] In the above embodiments, the control method can dynamically adjust the power supply strategy according to environmental conditions and load requirements by real-time collection of parameters such as photovoltaic power generation power, city power access status, and energy storage capacity, combined with a preset priority strategy, thereby realizing the automation of energy scheduling and improving the operating efficiency of the energy storage device. Secondly, the three-level power supply control strategy proposed by the control method forms a complete power supply guarantee system. Even if a certain energy supply is insufficient, it can automatically switch to other power supply modes to ensure the continuity of power supply services. At the same time, the control method maximizes the proportion of clean energy use by setting photovoltaic power generation as the highest priority and combining it with the caching function of the energy storage unit 22.

[0085] In addition, through real-time monitoring of the remaining power of the energy storage unit 22 and a graded early warning mechanism, the control method can enable the system to promptly detect and prevent possible power supply risks, thereby avoiding unexpected service interruptions due to energy storage depletion.

[0086] In one embodiment, before the target power supply power and energy state parameters, the control method also includes: S101, setting the reference power PB according to the specification parameters of the charging output interface 40; calculating the target power supply power PT according to the preset margin coefficient α and the reference power PB: PT=PB×(1+α); wherein the margin coefficient α is used to compensate for the loss during the power supply process.

[0087] In this embodiment, by setting the reference power and combining the margin coefficient, the power supply process can be controlled more accurately to ensure the stability and reliability of the charging service.

[0088] Before executing power supply control, you first need to determine the appropriate target power supply power. This process is divided into two key steps: first, the setting of the reference power, and then the calculation of the target power. For the setting of the reference power PB, the system will automatically complete it according to the specification parameters of the charging output interface 40. For example, when using a 120kW DC fast charging interface, the system will set the reference power PB to 120kW; when using a 7kW AC slow charging interface, PB will be set to 7kW. This method of setting the reference power based on the actual interface specifications ensures the matching of the power supply parameters with the charging equipment.

[0089] After obtaining the reference power PB, the margin coefficient α is introduced for correction calculation to obtain the final target power supply power PT. The calculation formula is: PT = PB × (1 + α). The margin coefficient α is mainly used to compensate for various losses in the power supply process, including line loss, transformer loss and conversion loss. Under different working conditions, the value range of α is usually between 0.05-0.15. For example, when α is 0.1, if the reference power PB is 100kW, the calculated target power supply power PT is 110kW. The extra 10kW is used to compensate for various losses in the entire power supply process.

[0090] The specific value of the margin coefficient α will be adjusted dynamically according to the actual operating environment. When the ambient temperature is high (such as in summer), the α value will be appropriately increased. At the same time, the α value will also be adjusted as the power supply distance changes: the longer the distance, the greater the line loss, and the α value needs to be increased accordingly. This dynamic adjustment mechanism ensures that the actual output power can be maintained stable under different working conditions.

[0091] The entire target power calculation process is completed automatically. Before each charging service is started, the PT calculation is completed quickly according to the selected charging interface and the current operating environment. The calculation results are displayed on the touch screen in real time, and the operator can also make fine adjustments according to actual needs.

[0092] This power calculation method with margin compensation solves the energy loss problem in the actual power supply process and ensures that the charging equipment can obtain a stable and sufficient energy supply. At the same time, the dynamically adjusted margin coefficient also improves the adaptability of the energy storage device, enabling it to maintain a good power supply effect under various working conditions.

[0093] In one embodiment, after controlling the photovoltaic power generation unit 21 to supply power to the charging output interface 40, the control method further includes: S2011, detecting the real-time output power P1 of the photovoltaic power generation unit 21 and the real-time load power P2 of the charging output interface 40; when P1 is greater than P2, calculating the surplus power ΔP: ΔP = P1-P2×(1+β), where β is the loss coefficient; judging whether the remaining capacity of the energy storage unit 22 is less than a preset charging cut-off threshold; when the remaining capacity of the energy storage unit 22 is less than the charging cut-off threshold, storing the electric energy corresponding to the surplus power in the energy storage unit 22.

[0094] In this embodiment, during the process of the photovoltaic power generation unit 21 supplying power to the charging output interface 40, the following monitoring and control process is continuously executed. First, two parameters are monitored in real time through the power detection module: the real-time output power P1 of the photovoltaic power generation unit 21, in kilowatts (kW); the real-time load power P2 of the charging output interface 40, in kilowatts (kW). P1 is collected through the data interface of the photovoltaic controller with a sampling frequency of 1Hz; P2 is measured and calculated by the voltage and current sensors of the charging interface, and is also updated at a frequency of 1Hz.

[0095] When it is detected that P1 is greater than P2, it indicates that the current photovoltaic power generation exceeds the demand of the charging load, and the calculation process of the surplus power will be triggered. The calculation formula of the surplus power ΔP is: ΔP = (P1-P2) × (1 + β), where β is the loss coefficient. The loss coefficient β here is similar to the function of the margin coefficient mentioned earlier, but the specific value will be set separately according to the characteristics of the energy storage circuit, usually between 0.08-0.12. For example, when P1 is 50kW, P2 is 30kW, and β is 0.1, the calculated surplus power ΔP is 22kW.

[0096] After obtaining the surplus power ΔP, it is further determined whether the state of the energy storage unit 22 is suitable for charging. This determination process is mainly based on the comparison between the remaining capacity of the energy storage unit 22 and the preset charging cut-off threshold. The charging cut-off threshold is usually set to 95% of the rated capacity of the battery, which takes into account the optimization of the charging characteristics and service life of the lithium battery. When the remaining capacity of the energy storage unit 22 is less than this threshold, the surplus electric energy will be stored in the energy storage unit 22.

[0097] For example, assume that the energy storage device is equipped with a 200kWh energy storage unit 22, and the charging cutoff threshold is set to 95% (i.e. 190kWh). When it is detected that the photovoltaic power has 22kW of surplus power and the remaining capacity of the current energy storage unit 22 is 150kWh, the energy storage charging process will be started to store this surplus power in the energy storage unit 22. The energy storage process is controlled by the energy storage inverter, and the charging power will be dynamically adjusted according to the real-time status of the battery to ensure the safety and efficiency of the charging process.

[0098] The advantages of this surplus energy management solution are: first, it ensures the maximum utilization of photovoltaic power generation and avoids energy waste through real-time monitoring and precise calculation; second, by considering losses and introducing appropriate compensation coefficients, it ensures the reliability of the energy conversion and storage process; third, by setting a reasonable energy storage threshold, it ensures that the energy storage unit 22 always remains in the best working state and extends the battery life.

[0099] In one embodiment, the start-up method of the control method includes: starting by receiving a mode selection instruction input by a user; or automatically starting by receiving a preset power supply strategy.

[0100] In this embodiment, two different starting modes can satisfy the personalized needs of users and ensure the automatic operation of the energy storage device.

[0101] The first startup method is to start it through the mode selection command input by the user. A human-computer interaction interface is provided on the 7-inch touch screen, and users can choose different operating modes according to actual needs. Specifically, the following optional modes are set on the interface: economic charging mode, clean energy priority mode and intelligent balancing mode. The economic charging mode mainly relies on photovoltaic power generation and city power supply during off-peak hours; the clean energy priority mode maximizes the use ratio of photovoltaic power generation; the intelligent balancing mode is automatically switched between various modes by the energy storage device to achieve the best operating effect. The user only needs to select the required mode through the touch screen, and the energy storage device will automatically start and run according to the corresponding strategy.

[0102] The second startup method is to automatically start by receiving a preset power supply strategy. The energy storage device has a built-in automatic startup strategy that can automatically select the appropriate time to start according to environmental conditions, load requirements and energy status. For example, when it is detected that the light intensity reaches the set threshold (such as the output voltage of the photovoltaic panel exceeds 200V), the photovoltaic power generation mode is automatically started; when the power of the energy storage unit 22 is less than 30% and is in the low period of the power grid electricity price, the mains charging mode is automatically started; when it is detected that the electric vehicle is connected to the charging port, the optimal power supply method is automatically selected and started according to the current energy status.

[0103] In actual applications, these two startup modes can be switched flexibly. For example, during the day, users can manually select the required operating mode, and at night they can switch to the automatic startup mode and manage themselves according to the preset strategy.

[0104] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A multi-source mobile energy storage device, characterized in that: include: Vehicle body; A multi-source power supply system is arranged on the vehicle body, the multi-source power supply system comprises a photovoltaic power generation unit, an energy storage unit and a mains power input unit, the photovoltaic power generation unit and the mains power input unit are electrically connected to the energy storage unit respectively; An energy conversion system, electrically connected to the multi-source power supply system, for converting the output electric energy of the photovoltaic power generation unit, the energy storage unit and the mains input unit into electric energy of preset specifications; a charging output interface, electrically connected to the energy conversion system; and An energy management system is electrically connected to the photovoltaic power generation unit, the energy storage unit, the mains input unit and the energy conversion system, respectively, and is used for: Based on the output power of the photovoltaic power generation unit, the access status of the mains input unit and the remaining power of the energy storage unit, control is performed to switch between the photovoltaic power supply mode, the mains power supply mode and the energy storage power supply mode.

2. The multi-source mobile energy storage device according to claim 1, characterized in that: The energy storage unit includes: an energy storage converter, a battery pack and a battery management system.

3. The multi-source mobile energy storage device according to claim 2, characterized in that: Also includes: A cooling system, the cooling system comprising at least one of a liquid cooling circuit and an air cooling device, for adjusting the operating temperature of the battery pack.

4. The multi-source mobile energy storage device according to claim 1, characterized in that: The energy conversion system includes: a DC-DC converter for the photovoltaic power generation unit, an AC-DC converter for the mains input unit, and an inverter for the charging output interface.

5. The multi-source mobile energy storage device according to any one of claims 1 to 4, characterized in that: The photovoltaic power generation unit is a photovoltaic panel arranged on the top of the vehicle body; the charging output interface includes a plurality of charging output ports.

6. A control method for a multi-source mobile energy storage device, characterized in that: include: Collecting energy status parameters, wherein the energy status parameters include the output power of the photovoltaic power generation unit, the access status of the mains input unit, and the remaining power of the energy storage unit; According to the target power supply and the energy state parameters, the following are executed in sequence according to the preset priorities: When the output power of the photovoltaic power generation unit is greater than or equal to the target power supply power, controlling the photovoltaic power generation unit to supply power to the charging output interface; When the output power of the photovoltaic power generation unit is less than the target power supply power and the mains input unit is in a connected state, controlling the mains input unit to supply power to the charging output interface; When the output power of the photovoltaic power generation unit is less than the target power supply power and the mains input unit is in a disconnected state, controlling the energy storage unit to supply power to the charging output interface; During the process of the energy storage unit supplying power to the charging output interface, the remaining power of the energy storage unit is monitored, and when the remaining power of the energy storage unit is lower than a preset threshold, an alarm signal is output.

7. The control method according to claim 6, characterized in that: Before the control method is performed based on the target power supply power and the energy state parameter, the control method further includes: Setting a reference power PB according to specification parameters of the charging output interface; According to the preset margin coefficient α and the reference power PB, the target power supply power PT is calculated: PT = PB × (1 + α); The margin coefficient α is used to compensate for the loss during the power supply process.

8. The control method according to claim 6 or 7, characterized in that: After controlling the photovoltaic power generation unit to supply power to the charging output interface, the control method further includes: Detecting the real-time output power P1 of the photovoltaic power generation unit and the real-time load power P2 of the charging output interface; When P1 is greater than P2, calculate the surplus power ΔP: ΔP=P1-P2×(1+β), where β is the loss coefficient; Determining whether the remaining capacity of the energy storage unit is less than a preset charging cut-off threshold; When the remaining capacity of the energy storage unit is less than the charging cut-off threshold, the electric energy corresponding to the surplus power is stored in the energy storage unit.

9. The control method according to claim 6, characterized in that: The starting method of the control method includes: Receive a mode selection instruction input by the user to start; or Receive the preset power supply strategy and start automatically.

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