A multi-source energy storage device

Abstract

The utility model discloses a kind of multi-source energy storage devices, comprising: cabinet body;Cabinet door, rotatable connection in the cabinet body;Heat dissipation component, installed in the cabinet door inside, including at least one heat dissipation fan, the cabinet door on corresponding to the heat dissipation fan place is provided with air port, the cabinet body in corresponding to the heat dissipation fan place is provided with accommodating space, to accommodate the heat dissipation fan when cabinet door is closed;Multi-source power supply component, set on cabinet body, including mains side access interface, clean energy power generation unit, the battery cluster for storing and releasing electric energy, for conveying and distributing direct current electric energy direct current bus, charging output interface and energy management unit, energy management unit according to the output power of clean energy power generation unit, battery cluster's state of charge SOC and mains side ac power supply's access state control mains side control unit, clean energy control unit, high-voltage distribution box and off-grid control unit's work, to switch power supply.

Description

Technical Field

[0001] This utility model relates to the field of energy storage technology, and more specifically to a multi-source energy storage device. Background Technology

[0002] Energy storage devices are a key component of power systems. They typically contain energy storage batteries and electronic control components, and their primary function is to store electricity generated from renewable energy sources (such as wind and solar power) and to supply power to external loads. Since both the energy storage batteries and electronic control components are heat-generating devices, they produce a certain amount of heat during operation. Therefore, to ensure the normal and efficient operation of the energy storage device, internal heat dissipation is necessary to maintain its internal temperature within a normal range during operation. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a multi-source energy storage device that can ensure that the internal temperature can be maintained within a normal range during operation.

[0004] To solve the above-mentioned technical problems, this utility model provides a multi-source energy storage device, comprising:

[0005] Cabinet;

[0006] The cabinet door is rotatably connected to the cabinet body;

[0007] A heat dissipation component is installed on the inside of the cabinet door and includes at least one heat dissipation fan. An air vent is provided on the cabinet door corresponding to the heat dissipation fan, and an accommodating space is provided inside the cabinet corresponding to the heat dissipation fan to accommodate the heat dissipation fan when the cabinet door is closed.

[0008] The multi-source power supply assembly, mounted on the cabinet, includes a mains power input interface, a clean energy generation unit, battery clusters for storing and releasing electrical energy, a DC bus for transmitting and distributing DC power, a charging output interface, and an energy management unit.

[0009] The mains power access interface is connected to the DC bus via a mains power control unit for converting AC power from the mains power supply to DC power.

[0010] The clean energy power generation unit is connected to the DC bus via a clean energy control unit for controlling the output of the clean energy power generation unit;

[0011] The battery cluster is connected to the DC bus via a high-voltage distribution box;

[0012] The charging output interface is connected to the DC bus via an off-grid control unit, which is used to convert the DC power of the DC bus into AC power to supply power to external loads.

[0013] The energy management unit controls the operation of the mains-side control unit, the clean energy control unit, the high-voltage distribution box, and the off-grid control unit based on the output power of the clean energy power generation unit, the state of charge (SOC) of the battery cluster, and the access status of the mains-side AC power supply, so as to switch the power supply of the clean energy power generation unit, the battery cluster, and / or the mains-side AC power supply.

[0014] The further technical solution is as follows: the heat dissipation component also includes a heat dissipation mesh, the heat dissipation mesh is installed on the inside of the cabinet door, and the heat dissipation fan is installed on the heat dissipation mesh.

[0015] A further technical solution is that the cooling fan is installed on the inside of the cabinet door, corresponding to the position of the battery cluster inside the cabinet.

[0016] The further technical solution is as follows: the heat dissipation component also includes a heat dissipation frame, the heat dissipation frame is installed on the inside of the cabinet door, and the heat dissipation fan is housed in the heat dissipation frame.

[0017] The further technical solution is as follows: the heat dissipation component includes multiple cooling fans, and the multiple cooling fans are fixed to the inside of the cabinet door in a double-row installation manner.

[0018] The further technical solution is as follows: the multi-source power supply component also includes a switching switch, and the AC power supply on the mains side includes mains power and backup AC power; wherein,

[0019] The input side of the switching switch is connected to the mains power and the backup AC power supply through the mains power access interface, and the output side of the switching switch is connected to the mains power control unit for selecting the mains power or the backup AC power supply to be connected to the mains power control unit.

[0020] The energy management unit is also electrically connected to the switching switch and is used to control the backup AC power supply or mains power supply according to the output power of the clean energy power generation unit, the state of charge (SOC) of the battery cluster and the state of the switching switch.

[0021] The further technical solution is as follows: the mains power control unit is connected to the output side of the switching switch via an AC bus, and a surge protector is also connected to the AC bus.

[0022] The further technical solution is as follows: the clean energy power generation unit includes at least one photovoltaic power generation unit, which is disposed on the top of the cabinet; the clean energy control unit includes at least one photovoltaic power generation control unit; wherein, the output end of the photovoltaic power generation unit is connected to the DC bus through the photovoltaic power generation control unit to supply power.

[0023] The further technical solution is as follows: the clean energy power generation unit also includes a wind power generation access interface, which is used to connect to an external wind power generation unit and to the DC bus for power supply.

[0024] The further technical solution is as follows: both the mains-side control unit and the off-grid control unit are energy storage converters.

[0025] Compared with existing technologies, the heat dissipation component in this multi-source energy storage device is installed separately inside the cabinet door. When the cabinet door is closed, it can be directly embedded into the cabinet body to effectively dissipate heat from the electrical components inside the cabinet, ensuring that the internal temperature of the energy storage device remains within a normal range during operation. When the cabinet door is open, the heat dissipation component can be detached from the cabinet body, which reduces the space occupied inside the cabinet and facilitates installation, commissioning, and subsequent maintenance. Furthermore, this energy storage device uses a multi-source power supply mode, which can switch and control the power supply according to the output power of the clean energy power generation unit, the state of charge (SOC) of the battery cluster, and the access status of the AC power supply on the mains side. This allows for switching of power supply based on the status of each power source, effectively meeting the actual power demand of the load and avoiding power supply problems caused by the failure or abnormality of a single power source, thus maintaining the stability and reliability of the power supply. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a specific embodiment of the multi-source energy storage device provided in this utility model.

[0027] Figure 2 This is a schematic diagram of the heat dissipation components and cabinet door in the multi-source energy storage device provided in this embodiment of the utility model.

[0028] Figure 3 This is a schematic diagram of the structure of the multi-source power supply component in the multi-source energy storage device provided in this embodiment of the utility model.

[0029] Explanation of reference numerals in the attached figures:

[0030] In the diagram: 10-Cabinet; 101-Accommodation space; 20-Cabinet door; 30-Heat dissipation component; 31-Heat dissipation fan; 32-Heat dissipation mesh; 33-Heat dissipation frame; 40-Refrigeration component; 711-Mainland power supply control unit; 72-Clean energy power generation unit; 721-Photovoltaic power generation unit; 722-Photovoltaic power generation control unit; 73-Battery cluster; 731-High voltage distribution box; 74-DC bus; 75-Charging output interface; 76-Off-grid control unit; 77-Surge protector. Detailed Implementation

[0031] To enable those skilled in the art to more clearly understand the purpose, technical solution and advantages of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0032] Reference Figures 1 to 3 , Figures 1 to 3 A schematic diagram of a specific embodiment of the multi-source energy storage device of this utility model is shown in the accompanying drawings. In the embodiment shown, the multi-source energy storage device includes a cabinet 10, a cabinet door 20, a heat dissipation assembly 30, and a multi-source power supply assembly. The cabinet door 20 is rotatably connected to the cabinet 10. The heat dissipation assembly 30 is installed inside the cabinet door 20 and includes at least one cooling fan 31. An air vent is provided on the cabinet door 20 corresponding to the cooling fan 31. An accommodating space 101 is provided inside the cabinet 10 corresponding to the cooling fan 31 to accommodate the cooling fan 31 when the cabinet door 20 is closed. The multi-source power supply assembly is disposed on the cabinet 10 and includes a mains power access interface, a clean energy generation unit 72, a battery cluster 73 for storing and releasing electrical energy, a DC bus 74 for transmitting and distributing DC power, a charging output interface 75, and an energy management unit. The mains power access interface is connected to a mains power control unit for converting AC power from the mains power supply to DC power. Unit 711 is connected to the DC bus 74; the clean energy power generation unit 72 is connected to the DC bus 74 through a clean energy control unit for controlling the output of the clean energy power generation unit 72; the battery cluster 73 is connected to the DC bus 74 through a high-voltage distribution box 731; the charging output interface 75 is used for load connection, and the charging output interface 75 is connected to the DC bus 74 through an off-grid control unit 76 for converting the DC power of the DC bus 74 into AC power for power supply; the energy management unit controls the operation of the mains-side control unit 711, the clean energy control unit, the high-voltage distribution box 731, and the off-grid control unit 76 according to the output power of the clean energy power generation unit 72, the state of charge (SOC) of the battery cluster 73, and the access status of the AC power supply on the mains side, so as to switch the power supply of the clean energy power generation unit 72, the battery cluster 73, and / or the AC power supply on the mains side. Preferably, in this embodiment, the cabinet door 20, which is equipped with the heat dissipation component 30, is rotatably connected to the back of the cabinet 10. Both the mains-side control unit 711 and the off-grid control unit 76 are energy storage converters. The mains-side control unit 711 is connected to the mains-side access interface and mainly converts the AC power output from the mains-side AC power supply of the multi-source energy storage device into DC power through the mains-side access interface. It also supplies power to the load through the DC bus 74 and charges the battery cluster 73. The off-grid control unit 76 is dedicated to the off-grid inverter function, maintaining the AC grid on the load side and supplying power.

[0033] As described above, the multi-source energy storage device of this utility model operates in a multi-source power supply mode. Power supply can be switched and controlled according to the output power of the clean energy power generation unit 72, the state of charge (SOC) of the battery cluster 73, and the connection status of the AC power supply on the mains side. This allows for switching power supply based on the status of each power source, effectively meeting the actual power demand of the load and avoiding power supply problems caused by a single power source failure or abnormality, thus maintaining the stability and reliability of the power supply. Furthermore, the heat dissipation component 30 can be installed separately inside the cabinet door 20. When the cabinet door 20 is closed, it can be directly embedded inside the cabinet 10, effectively dissipating heat from the electrical components inside the cabinet 10, ensuring that the internal temperature of the energy storage device remains within a normal range during operation. When the cabinet door 20 is open, the heat dissipation component 30 is detached from the space inside the cabinet 10, reducing the space occupied by the cabinet 10 and facilitating installation, commissioning, and subsequent maintenance.

[0034] In some embodiments, the heat dissipation assembly 30 further includes a heat dissipation mesh 32, which is installed inside the cabinet door 20, and the heat dissipation fan 31 is installed inside the cabinet door 20 corresponding to the position of the battery cluster 73 inside the cabinet 10.

[0035] like Figure 2 As shown, in this embodiment, there are six cooling fans 31, which are fixed to the inside of the cabinet door 20 in a double-row installation. Furthermore, the heat dissipation assembly 30 also includes a heat dissipation frame 33, which is installed inside the cabinet door 20. All six cooling fans 31 are housed within the heat dissipation frame 33, and a protective net can also be provided on the heat dissipation frame 33. In this invention, both the heat dissipation frame 33 and the protective net serve a protective function, preventing damage to the cooling fans 31. Because there is a gap between the cabinet door 20 and the cabinet body 10, when the cabinet door 20 is closed, external rainwater or other debris may fall onto the heat dissipation frame 33 through the gap. Rainwater, in particular, can fall downwards along the path provided by the heat dissipation frame without wetting the cooling fans 31. The heat dissipation frame 33 also serves a waterproof function.

[0036] Continue to refer to Figure 1 Preferably, the energy storage device may further include a cooling component 40, which is located on the outside of the cabinet 10 and is used to deliver cooling gas into the cabinet 10 to further accelerate heat dissipation.

[0037] In some embodiments, the multi-source power supply assembly further includes a switching switch S1, and the AC power supply on the mains side includes mains power and a backup AC power supply. The input side of the switching switch S1 is connected to the mains power and the backup AC power supply via a mains power access interface, and the output side of the switching switch S1 is connected to the mains power control unit 711 via an AC bus, for selecting the mains power or the backup AC power supply to connect to the mains power control unit 711. The energy management unit is also electrically connected to the switching switch S1, for controlling the backup AC power supply or the mains power supply based on the output power of the clean energy power generation unit 72, the state of charge (SOC) of the battery cluster 73, and the state of the switching switch S1. Preferably, the switching switch S1 is an ATS (Automatic Transfer Switch), the backup AC power supply can be a diesel generator set, and the AC bus is also connected to a surge protector 77 to protect the system equipment from overvoltage surges. In this embodiment, under normal circumstances, the clean energy power generation unit 72 and the battery cluster 73 are given priority in power supply. When the clean energy power generation unit 72 generates power and the battery cluster 73 has insufficient energy storage, the mains power and diesel generator set are started as backup power sources to charge the battery cluster 73 and ensure power supply to the load. Based on the above design, the switching switch S1 is used to automatically switch between mains power and diesel generator set and connect them to the AC bus.

[0038] In some embodiments, the clean energy power generation unit 72 includes two photovoltaic power generation units 721, and the clean energy control unit includes two photovoltaic power generation control units 722. The photovoltaic power generation units 721 can be disposed on the top of the cabinet 10, and the photovoltaic power generation control units 722 can operate in MPPT mode. The output terminal of the photovoltaic power generation unit 721 is connected to the DC bus 74 through the photovoltaic power generation control units 722 to supply power to the load through the DC bus 74 and / or charge the battery cluster 73.

[0039] Furthermore, in some other embodiments, the clean energy power generation unit 72 may also include a wind power generation access interface, which is used to connect to an external wind power generation unit and is connected to the DC bus 74 for power supply.

[0040] Understandably, in this utility model, the energy management unit is the control unit of the multi-source energy storage device, and a programmable logic controller (PLC) can be used as the main controller. The energy management unit can monitor in real time the load power, the real-time output power of the clean energy power generation unit 72 (photovoltaic power generation unit 721 and / or wind power generation unit), the access status of the AC power supply on the mains side, and the state of charge (SOC) of the battery cluster 73, and other status parameters.

[0041] The multi-source power supply component of this utility model initially operates in off-grid mode by default, operating independently of the public power grid. It is powered primarily by the clean energy power generation unit 72 and / or the battery cluster 73. When the energy storage capacity of the clean energy power generation unit 72 and the battery cluster 73 is insufficient, it exits the off-grid mode, and the AC power supply on the mains side is activated as a backup power source to charge the battery cluster 73 and ensure the power supply to the load.

[0042] The specific control of the multi-source power supply component in the multi-source energy storage device of this utility model is described below. The specific control process is as follows:

[0043] S1. Determine the output power of the clean energy power generation unit and the load power of the multi-source energy storage device.

[0044] S2. Determine whether the output power of the clean energy power generation unit is greater than or equal to the load power; if yes, proceed to steps S3-S4; if no, proceed to step S5.

[0045] S3. Control the clean energy power generation unit to supply power to the load and store the remaining electrical energy in the battery cluster, and detect the state of charge (SOC) of the battery cluster.

[0046] In this step, the photovoltaic power generation unit discharges to supply the load, and the excess electrical energy is also absorbed and stored by the battery cluster.

[0047] S4. Control the output of the clean energy power generation unit according to the state of charge (SOC) of the battery cluster.

[0048] Step S4 specifically includes the following steps:

[0049] S4A. Determine whether the state of charge (SOC) of the battery cluster is greater than or equal to the first upper limit threshold; if yes, proceed to steps S4B-S4C; if no, proceed to step S4D.

[0050] In this step, the first upper limit threshold is 90% of the battery capacity, that is, 90% of the battery cluster's full charge state. When the state of charge (SOC) of the battery cluster reaches 90% of the battery capacity, the output of the photovoltaic power generation unit is limited, and the load is mainly supplied by the discharge of the battery cluster. When the SOC of the battery cluster does not reach 90% of the battery capacity, the maximum output of the photovoltaic power generation unit is maintained.

[0051] S4B: Control the clean energy power generation unit to limit the output of the clean energy power generation unit, control the power supply of the battery cluster, and enter the main battery power supply mode.

[0052] In this step, the output of the photovoltaic power generation unit is limited by controlling the photovoltaic power generation control unit, while the battery cluster discharges to the DC bus through the high-voltage distribution box, entering the main power supply mode of the battery.

[0053] S4C: After entering the main battery power supply mode, it checks whether the state of charge (SOC) of the battery cluster is less than the second upper limit threshold. If so, the output restriction on the clean energy power generation unit is lifted; otherwise, the current state is maintained.

[0054] In this step, the second upper limit threshold is 80% of the battery capacity, that is, 80% of the battery cluster's full charge state. When entering the main battery power supply mode, if the state of charge (SOC) of the battery cluster drops below 80% of the battery capacity, the output restriction on the photovoltaic power generation unit is lifted, and the load is mainly supplied by the discharge of the photovoltaic power generation unit.

[0055] S4D: Maintain the maximum output of the clean energy power generation unit.

[0056] S5. Control the power supply of the clean energy generation unit, battery cluster and / or AC power supply according to the state of charge (SOC) of the battery cluster and the access status of the AC power supply on the mains side.

[0057] This step S5 specifically includes the following steps S5A-S5J:

[0058] S5A controls the joint power supply of clean energy generation units and battery clusters.

[0059] In this step, when the output power of the photovoltaic power generation unit is less than the load power, the output power of the photovoltaic power generation unit is limited, and it enters the photovoltaic and battery joint power supply mode. When applied to the multi-source energy storage device in the above embodiment, the energy management unit controls the photovoltaic power generation control unit and the high-voltage distribution box so that the battery cluster discharges to the DC bus through the high-voltage distribution box, and together with the photovoltaic power generation unit, supplies power to the load, and enters the photovoltaic and battery joint power supply mode.

[0060] S5B: Detect whether the state of charge (SOC) of the battery cluster is less than or equal to the first lower threshold. If not, maintain joint power supply between the clean energy power generation unit and the battery cluster. If yes, execute steps S5C-S5J.

[0061] In this step, the first lower limit threshold is 30% of the battery capacity, that is, 30% of the battery cluster's full charge state. After entering the photovoltaic and battery combined power supply mode, when the state of charge (SOC) of the battery cluster drops to 30% as detected in real time, it indicates that the energy storage capacity of the clean energy power generation unit and the battery cluster is insufficient. The multi-source energy storage device exits the off-grid mode, and the AC power supply on the grid side will be started as a backup power supply.

[0062] S5C: Detect the connection status of AC power supply on the mains side; if the mains power is connected normally, proceed to steps S5D-S5E; if the mains power is not connected or the connection is abnormal, proceed to steps S5F-S5H.

[0063] In this embodiment, the connection status of the AC power supply on the mains side can be obtained by detecting the status of the ATS automatic transfer switch. When the ATS automatic transfer switch is offline, it means that the mains power is not connected. At this time, the backup AC power supply (such as a diesel generator set) is started. When the ATS automatic transfer switch is online, it is detected whether the mains power is connected normally.

[0064] In this step, if the mains power is normally connected, the system enters mains power supply mode to supply power to the load and charge the battery pack simultaneously. The state of charge (SOC) of the battery pack is monitored in real time. When the SOC of the battery pack is greater than or equal to the grid-connected SOC limit, the system returns to off-grid mode and repeats step S2. Understandably, the grid-connected SOC limit is the maximum allowable charging state of the battery when connected to the grid.

[0065] S5D: Enable AC power supply mode so that AC power supplies the load and charges the battery pack.

[0066] S5E: Detect whether the state of charge (SOC) of the battery cluster is greater than or equal to the grid-connected SOC limit. If yes, repeat step S2. If no, maintain the mains power supply mode.

[0067] In this step, when the state of charge (SOC) of the battery cluster reaches the grid-connected SOC limit, the energy management unit controls the grid-side control unit to shut down, stops drawing power from the grid-side AC power source, and the system returns to off-grid mode, with priority given to power supply from the photovoltaic power generation unit and the battery cluster.

[0068] S5F: Start the backup AC power supply on the mains side; if the backup AC power supply starts successfully, proceed to steps S5G-S5H; if the backup AC power supply fails to start, proceed to steps S5I-S5J.

[0069] In this invention, when the mains power is not connected or the connection is abnormal, the diesel generator set is started. If the start is successful, the diesel generator set power supply mode is entered to supply power to the load and charge the battery cluster at the same time. If the start fails, the photovoltaic and battery combined power supply mode is maintained, and the state of charge (SOC) of the battery cluster is monitored in real time to see if it is less than or equal to the second lower threshold. When it drops to the second lower threshold, the power supply to the load is cut off, and the photovoltaic power generation unit prioritizes charging the battery cluster so that the battery cluster is not damaged due to low charge. When the SOC of the battery cluster rises to the preset recovery threshold, the off-grid control unit is restarted to restore power supply to the load.

[0070] S5G enters the backup AC power supply mode so that the backup AC power supply can supply power to the load and charge the battery cluster.

[0071] S5H: Detect whether the state of charge (SOC) of the battery cluster is greater than or equal to the grid-connected SOC limit. If yes, repeat step S2. If no, maintain the backup AC power supply mode.

[0072] S5I maintains the joint power supply of the clean energy power generation unit and the battery cluster, and detects whether the state of charge (SOC) of the battery cluster is less than or equal to the second lower threshold.

[0073] In this step, the second lower limit threshold is 10% of the battery capacity, that is, 10% of the battery cluster's full charge state. When there is no mains power supply, the backup AC power supply fails to start, and the state of charge (SOC) of the battery cluster drops to 10% of the battery capacity, the energy management unit controls the off-grid control unit to shut down and disconnect the DC bus from the load to prevent the battery cluster from being damaged due to low charge.

[0074] S5J, If so, disconnect the power supply to the load, and the clean energy power generation unit charges the battery cluster until the state of charge (SOC) of the battery cluster is greater than or equal to the preset recovery threshold, then restore the power supply to the load.

[0075] In this step, the preset threshold is restored to 20% of the battery capacity, that is, 20% of the battery cluster's full charge state. When the state of charge (SOC) of the battery cluster rises to 20% of the battery capacity, the off-grid control unit is restarted to restore power supply to the load.

[0076] In summary, this utility model's multi-source energy storage device operates in a multi-source power supply mode. Power supply can be switched and controlled according to the output power of the clean energy power generation unit, the state of charge (SOC) of the battery cluster, and the connection status of the AC power source on the mains side. This allows for switching power supply based on the status of each power source, effectively meeting the actual power demand of the load and avoiding power supply problems caused by the failure or abnormality of a single power source, thus maintaining the stability and reliability of the power supply. Furthermore, the heat dissipation component can be installed separately inside the cabinet door. When the door is closed, it can be directly embedded in the cabinet, effectively dissipating heat from the electrical components inside the cabinet and ensuring that the internal temperature of the energy storage device remains within a normal range during operation. When the cabinet door is open, the heat dissipation component is detached from the cabinet space, reducing the space occupied and facilitating installation, commissioning, and subsequent maintenance.

[0077] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Those skilled in the art can make various equivalent changes and improvements based on the above embodiments. All equivalent changes or modifications made within the scope of the claims should fall within the protection scope of the present utility model.

Claims

1. A multi-source energy storage device, characterized in that, The multi-source energy storage device includes: Cabinet; The cabinet door is rotatably connected to the cabinet body; A heat dissipation component is installed on the inside of the cabinet door and includes at least one heat dissipation fan. An air vent is provided on the cabinet door corresponding to the heat dissipation fan, and an accommodating space is provided inside the cabinet corresponding to the heat dissipation fan to accommodate the heat dissipation fan when the cabinet door is closed. The multi-source power supply assembly, mounted on the cabinet, includes a mains power input interface, a clean energy generation unit, battery clusters for storing and releasing electrical energy, a DC bus for transmitting and distributing DC power, a charging output interface, and an energy management unit. The mains power access interface is connected to the DC bus via a mains power control unit for converting AC power from the mains power supply to DC power. The clean energy power generation unit is connected to the DC bus via a clean energy control unit for controlling the output of the clean energy power generation unit; The battery cluster is connected to the DC bus via a high-voltage distribution box; The charging output interface is connected to the DC bus via an off-grid control unit, which is used to convert the DC power of the DC bus into AC power to supply power to external loads. The energy management unit controls the operation of the mains-side control unit, the clean energy control unit, the high-voltage distribution box, and the off-grid control unit based on the output power of the clean energy power generation unit, the state of charge (SOC) of the battery cluster, and the access status of the mains-side AC power supply, so as to switch the power supply of the clean energy power generation unit, the battery cluster, and / or the mains-side AC power supply.

2. The multi-source energy storage device as described in claim 1, characterized in that, The heat dissipation assembly also includes a heat dissipation mesh, which is installed on the inside of the cabinet door, and the cooling fan is installed on the heat dissipation mesh.

3. The multi-source energy storage device as described in claim 1 or 2, characterized in that, The cooling fan is installed on the inside of the cabinet door, corresponding to the location of the battery cluster inside the cabinet.

4. The multi-source energy storage device as described in claim 1, characterized in that, The heat dissipation assembly also includes a heat dissipation frame, which is installed on the inside of the cabinet door, and the cooling fan is housed within the heat dissipation frame.

5. The multi-source energy storage device as described in claim 1, characterized in that, The heat dissipation assembly includes multiple cooling fans, which are fixed to the inside of the cabinet door in a double-row installation manner.

6. The multi-source energy storage device as described in claim 1, characterized in that, The multi-source power supply component also includes a switching switch, and the AC power supply on the mains side includes mains power and a backup AC power supply; wherein... The input side of the switching switch is connected to the mains power and the backup AC power supply through the mains power access interface, and the output side of the switching switch is connected to the mains power control unit for selecting the mains power or the backup AC power supply to be connected to the mains power control unit. The energy management unit is also electrically connected to the switching switch and is used to control the backup AC power supply or mains power supply according to the output power of the clean energy power generation unit, the state of charge (SOC) of the battery cluster and the state of the switching switch.

7. The multi-source energy storage device as described in claim 6, characterized in that, The mains power control unit is connected to the output side of the switching switch via an AC bus, and a surge protector is also connected to the AC bus.

8. The multi-source energy storage device as described in claim 1, characterized in that, The clean energy power generation unit includes at least one photovoltaic power generation unit, which is located on the top of the cabinet. The clean energy control unit includes at least one photovoltaic power generation control unit. The output of the photovoltaic power generation unit is connected to the DC bus through the photovoltaic power generation control unit to supply power.

9. The multi-source energy storage device as described in claim 8, characterized in that, The clean energy power generation unit also includes a wind power generation access interface, which is used to connect to an external wind power generation unit and is connected to the DC bus to supply power.

10. The multi-source energy storage device as described in claim 1, characterized in that, Both the mains-side control unit and the off-grid control unit are energy storage converters.

Images