Energy storage cabinet

Abstract

According to the energy storage cabinet provided by the utility model, the advantage of small outdoor occupied volume can be fully utilized to integrate a battery energy system, a grid-connected and off-grid PCS system, a transformation system, a photovoltaic interface, a generator interface, a commercial power interface and the like into a whole to form the energy storage cabinet, and the energy storage cabinet can meet the outdoor application environment and meet the problem of regional diversity of product layout. And on-site arrangement is flexible, and multiple sets of systems can be combined for use. According to the utility model, the battery energy system, the grid-connected and off-grid PCS system and the voltage transformation system are respectively isolated from independent heat dissipation channels to form three independent heat dissipation systems, so that the problem of thermal cascade among the systems is avoided, and the protection level can be improved by IP55 to meet various outdoor application environments. Therefore, the energy storage cabinet provided by the utility model can be used as a stand-by power supply to supplement electricity loads for enterprises, sufficient stand-by power supply guarantee is provided, and shutdown time cost and shutdown loss caused by sudden power failure accidents are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electrochemical energy storage, in particular to an off-grid energy storage cabinet for industrial and commercial use. Background Art

[0002] At present, industrial and commercial energy storage power stations are the main application of energy storage technology on the user side. In terms of investment and construction, they have the advantages of small single-unit scale, low voltage level, and settlement based on electricity prices. The current income mainly comes from the electricity bill savings brought about by the peak-valley price difference.

[0003] In recent years, with the increasing trend of peak-valley price difference, more and more high-power-consuming industrial and commercial users have installed industrial and commercial energy storage cabinets for energy efficiency management. Therefore, how to provide enterprises with sufficient backup power supply guarantee and reduce the downtime cost and downtime loss caused by sudden power outages is an urgent problem to be solved. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide an energy storage cabinet to solve the technical problems existing in the prior art.

[0005] To achieve the above-mentioned purpose and other related purposes, the utility model provides an energy storage cabinet, comprising: an energy storage cabinet body, the energy storage cabinet body is provided with a plurality of independent areas, wherein a battery energy system for storing and releasing electric energy and a charging and discharging system for charging and discharging the battery energy system are respectively located in different independent areas;

[0006] The energy storage cabinet body is also provided with a heat dissipation channel for cooling the battery energy system and the charging and discharging system.

[0007] Optionally, the charging and discharging system includes: a DC bus, a DC-DC conversion module, an on-grid and off-grid PCS system, a transformer system, a photovoltaic access terminal, a generator and a mains access terminal;

[0008] The photovoltaic access terminal is connected to the battery energy system through a DC-DC conversion module, so that the electric energy generated by photovoltaic power generation is transmitted to the DC-DC conversion module through the photovoltaic access terminal, and then transmitted to the battery energy system through the DC bus after DC-DC conversion by the DC-DC conversion module;

[0009] The generator and the mains access end are connected to the battery energy system through the transformer system and the grid-connected and off-grid PCS system respectively, so that the electric energy generated by the generator and the mains is converted and boosted by the transformer system and then transmitted to the grid-connected and off-grid PCS system for grid connection, and then transmitted to the battery energy system by the grid-connected and off-grid PCS system and the DC bus.

[0010] Optionally, the charging and discharging system further comprises a load output terminal, and the load output terminal is connected to the transformer system;

[0011] The load output end is used to release electric energy to the outside after the voltage conversion system and the grid-connected and off-grid PCS system cooperate with each other to convert the direct current of the battery energy system into alternating current.

[0012] Optionally, the battery energy system comprises: a high voltage box, a battery module connected to the high voltage box and used for storing and releasing electric energy;

[0013] The high voltage box is respectively connected to the DC-DC conversion module and the off-grid PCS system.

[0014] Optionally, the battery module is located in an independent area, the high-voltage box, the DC-DC conversion module, and the grid-connected and off-grid PCS system are located in the same independent area, and the transformer system is located in an independent area.

[0015] Optionally, the battery energy system, the on-grid and off-grid PCS system and the transformer system each have an independent heat dissipation channel.

[0016] Optionally, an air conditioner arranged near the battery module delivers cold air to the rear end of the battery module through the air conditioner cold air outlet, and an exhaust extension arranged at the front end of the battery module draws the cold air at the rear end of the battery module to the front end of the battery module, and discharges it through the air conditioner hot air outlet, thereby forming a heat dissipation channel for the battery energy system.

[0017] Optionally, a first centrifugal fan arranged near the transformer system extracts cold air entering from the bottom of the energy storage cabinet body, so that the extracted cold air flows through the transformer system and is discharged from the energy storage cabinet body by the first centrifugal fan, forming a heat dissipation channel for the transformer system.

[0018] Optionally, an axial flow fan arranged near the on-grid and off-grid PCS system blows the hot air inside the on-grid and off-grid PCS system to the rear end of the energy storage cabinet body, and discharges the hot air out of the energy storage cabinet body through a second centrifugal fan arranged at the rear end of the energy storage cabinet body, thereby forming a heat dissipation channel for the on-grid and off-grid PCS system; wherein an air inlet for external air to flow into the on-grid and off-grid PCS system is arranged on the side of the energy storage cabinet body.

[0019] Optionally, the battery module is composed of a plurality of single battery packs connected in series.

[0020] As described above, the utility model provides an energy storage cabinet, which has the following beneficial effects: the utility model fully utilizes the advantage of small outdoor occupation volume to integrate the battery energy system, grid-connected and off-grid PCS system, transformer system, photovoltaic interface, generator interface, mains interface, etc. into an energy storage cabinet, which can meet the outdoor application environment and the regional diversity of product layout. The flexible on-site layout can realize the use of multiple systems in cabinets. Moreover, the utility model isolates the battery energy system, grid-connected and off-grid PCS system, and transformer system into separate heat dissipation channels to form three independent heat dissipation systems, avoiding the problem of thermal cascade between the systems, and can increase the protection level to IP55 to meet various outdoor application environments. Therefore, the energy storage cabinet provided by the utility model can be used as a backup power supply to supply enterprises to supplement power loads, provide sufficient backup power supply guarantee, and reduce the downtime cost and downtime loss caused by sudden power outages. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The electrical connection diagram for the battery energy system, on-grid and off-grid PCS system and pressure system;

[0022] Figure 2 Main view of the partition isolation of the battery energy system, the on-grid and off-grid PCS system and the pressure system;

[0023] Figure 3 for Figure 2 Rear view of

[0024] Figure 4 It is a schematic diagram of the heat dissipation channel of the battery energy system;

[0025] Figure 5 It is a schematic diagram of the heat dissipation channel of the transformer system;

[0026] Figure 6 It is a schematic diagram of the heat dissipation channel of the grid-connected and off-grid PCS system.

[0027] In the figure, 1 is a battery pack, 2 is a high-voltage box, 3 is a DC bus, 4 is a DC-DC conversion module, 5 is a grid-connected and off-grid PCS system, 6 is a transformer system, 7 is a photovoltaic access terminal, 8 is a generator and a mains access terminal, 9 is an air conditioner, 10 is an air conditioner cold air outlet, 11 is an air conditioner hot air input port, 12 is an exhaust fan, 13 is a first centrifugal fan, 14 is an axial flow fan, 15 is a second centrifugal fan, and 16 is a load output terminal. DETAILED DESCRIPTION

[0028] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0029] It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the present invention. Therefore, the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0030] In an exemplary embodiment, the embodiment provides an energy storage cabinet, including: an energy storage cabinet body, the energy storage cabinet body is provided with a plurality of independent areas, wherein a battery energy system for storing and releasing electric energy and a charging and discharging system for charging and discharging the battery energy system are respectively located in different independent areas; the energy storage cabinet body is also provided with a heat dissipation channel for cooling the battery energy system and the charging and discharging system. In this embodiment, if the energy storage cabinet is applied to the industrial and commercial fields, the energy storage cabinet can also be referred to as an off-grid photovoltaic storage integrated outdoor cabinet suitable for industrial and commercial use.

[0031] According to the above records, the charging and discharging system in this embodiment includes: a DC-DC conversion module 4, an off-grid PCS system 5, a transformer system 6, a photovoltaic access terminal 7, a generator and a mains access terminal 8. Among them, the photovoltaic access terminal 7 is connected to the battery energy system through the DC-DC conversion module 4, so that the electric energy generated by photovoltaic power generation is transmitted to the DC-DC conversion module 4 through the photovoltaic access terminal 7, and is transmitted to the battery energy system after DC-DC conversion by the DC-DC conversion module 4, so as to charge the battery energy system with the electric energy generated by photovoltaic power generation. The generator and the mains access terminal 8 are connected to the battery energy system through the transformer system 6 and the off-grid PCS system 5, respectively, so that the electric energy generated by the generator and the mains is converted and boosted by the transformer system 6 and transmitted to the off-grid PCS system 5 for grid connection, and is transmitted to the battery energy system by the off-grid PCS system 5, so as to charge the battery energy system with the electric energy generated by the generator and the mains. In addition, in this embodiment, the charging and discharging system also includes a load output terminal 16, which is connected to the transformer system 6; the load output terminal 16 is used to release electrical energy to the outside after the transformer system 6 and the grid-connected PCS system 5 cooperate with each other to convert the DC of the battery energy system into AC.

[0032] According to the above records, the battery energy system in this embodiment includes: a high-voltage box 2, a battery module connected to the high-voltage box 2 for storing and releasing electric energy; the high-voltage box 2 is respectively connected to the DC-DC conversion module 4 and the grid-connected and off-grid PCS system 5. Specifically, in this embodiment, the battery module is composed of a plurality of single battery packs 1 connected in series. As an example, the battery module in this embodiment is composed of 9 single battery packs 1 connected in series. Among them, the electrical connection relationship diagram of the battery energy system, the grid-connected and off-grid PCS system and the high-voltage system is shown in the figure Figure 1 As shown in the figure, the partition isolation diagram of the battery energy system, the grid-connected and off-grid PCS system and the pressure system is as follows Figure 2 and Figure 3 In this embodiment, the voltage range of the high voltage box can be determined according to the application scenario and design requirements. For example, in this embodiment, the voltage range of the high voltage box can be 3kV and above.

[0033] According to the above records, in an exemplary embodiment, the battery module is located in an independent area, the high voltage box 2, the DC-DC conversion module 4, and the on-grid and off-grid PCS system 5 are located in the same independent area, and the transformer system 6 is located in an independent area.

[0034] According to the above records, in an exemplary embodiment, the battery energy system, the on-grid and off-grid PCS system 5 and the transformer system 6 each have an independent heat dissipation channel. Specifically, Figure 4 As shown, the air conditioner 9 arranged near the battery module delivers cold air to the rear end of the battery module through the air conditioner cold air outlet 10, and the exhaust extension arranged at the front end of the battery module extracts the cold air at the rear end of the battery module to the front end of the battery module and discharges it through the air conditioner hot air inlet 11, forming a heat dissipation channel for the battery energy system. Figure 5 As shown, the first centrifugal fan 13 disposed near the transformer system 6 extracts the cold air entering from the bottom of the energy storage cabinet body, so that the extracted cold air flows through the transformer system 6 and then is discharged from the energy storage cabinet body by the first centrifugal fan 13, forming a heat dissipation channel for the transformer system 6. Figure 6 As shown, the axial flow fan 14 arranged near the on-grid and off-grid PCS system 5 blows the hot air inside the on-grid and off-grid PCS system 5 to the rear end of the energy storage cabinet body, and discharges the hot air out of the energy storage cabinet body through the second centrifugal fan 15 arranged at the rear end of the energy storage cabinet body, thereby forming a heat dissipation channel for the on-grid and off-grid PCS system 5; wherein, an air inlet for external air to flow into the on-grid and off-grid PCS system 5 is arranged on the side of the energy storage cabinet body.

[0035] In another exemplary embodiment, see Figures 1 to 6 As shown in FIG. 1 , this embodiment provides an off-grid photovoltaic and storage integrated outdoor cabinet suitable for industrial and commercial use. The electrical connection relationship diagram of the battery energy system, off-grid PCS system and transformer system of the outdoor cabinet is shown in FIG. Figure 1As shown in the figure, the partition isolation diagram of the battery energy system, the grid-connected and off-grid PCS system and the transformer system is as follows Figure 2 and Figure 3 As shown in the figure, the heat dissipation channel of the battery energy system is as follows Figure 4 As shown in the figure, the heat dissipation channel of the transformer system is as follows Figure 5 As shown in the figure, the heat dissipation channel diagram of the grid-connected and off-grid PCS system is as follows Figure 6 The outdoor cabinet is provided with: battery pack 1, high voltage box 2, DC bus 3, DC-DC conversion module 4, off-grid PCS system 5, transformer system 6, photovoltaic access terminal 7, generator and mains access terminal 8, air conditioner 9, air conditioner cold air outlet 10, air conditioner hot air inlet 11, exhaust fan 12, first centrifugal fan 13, axial flow fan 14, second centrifugal fan 15 and load output terminal 16.

[0036] The 9 battery packs 1 are connected in series and form a battery energy system with the high-voltage box 2. The electric energy generated by photovoltaic power generation is transmitted to the DC-DC conversion module 4 through the photovoltaic access terminal 7, and is converted from DC to DC by the DC-DC conversion module 4 and then transmitted to the high-voltage box 2 through the DC bus 3, so as to charge the battery energy system with the electric energy generated by photovoltaic power generation. The generator and the mains access terminal 8 are connected to the battery energy system through the transformer system 6 and the off-grid PCS system 5 respectively, so that the electric energy generated by the generator and the mains is converted and boosted by the transformer system 6 and then transmitted to the off-grid PCS system 5 for grid connection, and is transmitted to the high-voltage box 2 by the off-grid PCS system 5 and the DC bus 3, so as to charge the battery energy system with the electric energy generated by the generator and the mains. When the battery energy system needs to be discharged, the DC of the battery energy system is converted into AC through the high-voltage box 2, the off-grid PCS system 5 and the transformer system 6, and then discharged through the load output terminal 16 to complete the electric energy release process.

[0037] like Figure 2 and Figure 3 As shown, the battery energy system in the outdoor cabinet is an independent area, the high-voltage box 2, the DC-DC conversion module 4 and the grid-connected PCS system 5 are an independent area, and the transformer system 6 is an independent area. In this embodiment, each independent system is isolated separately, and there is only electrical connection between the systems, and there is no structural mixed space.

[0038] like Figure 4 As shown, the air conditioner 9 arranged near the battery module delivers cold air to the rear end of the battery module through the air conditioner cold air outlet 10, and the exhaust extension arranged at the front end of the battery module draws the cold air at the rear end of the battery module to the front end of the battery module, and discharges it through the air conditioner hot air inlet 11, forming a heat dissipation channel for the battery energy system.

[0039] like Figure 5As shown, the first centrifugal fan 13 arranged near the transformer system 6 extracts the cold air entering from the bottom of the outdoor cabinet body, so that the extracted cold air flows through the transformer system 6 and is discharged from the outdoor cabinet body by the first centrifugal fan 13, forming a heat dissipation channel for the transformer system 6.

[0040] like Figure 6 As shown, the axial flow fan 14 arranged near the on-grid and off-grid PCS system 5 blows the hot air inside the on-grid and off-grid PCS system 5 to the rear end of the outdoor cabinet body, and discharges it out of the outdoor cabinet body through the second centrifugal fan 15 arranged at the rear end of the outdoor cabinet body, forming a heat dissipation channel for the on-grid and off-grid PCS system 5; wherein, an air inlet for external air to flow into the on-grid and off-grid PCS system 5 is arranged on the side of the outdoor cabinet body.

[0041] In summary, the utility model provides an energy storage cabinet. First, the battery energy system is responsible for the storage and release of electric energy, and the on-grid and off-grid PCS system is responsible for charging the battery through photovoltaic, generator and city power. At the same time, the on-grid and off-grid PCS system can discharge the electric energy in AC to meet the load operation requirements. The electrical connection relationship diagram of the battery energy system, the on-grid and off-grid PCS system and the transformer system is shown in the figure. Figure 1 Then the battery energy system, the grid-connected and off-grid PCS system, and the transformer system are designed to be partitioned and isolated, as shown in the figure. Figure 2 and Figure 3 As shown, it ensures that each system can operate independently when the energy storage cabinet is working without interfering with each other. Secondly, the heat dissipation ducts of the battery energy system, the grid-connected and off-grid PCS system, and the transformer system are designed with independent duct structures to meet the different operating temperatures and heat dissipation requirements of each system, such as Figures 4 to 6 As shown in the figure, the battery energy system has high requirements for the working temperature, so an air conditioning temperature control system is used to ensure it; the off-grid PCS system and transformer system use independent fans for forced air cooling to ensure stable operation of the system while reducing the cost of the cooling system.

[0042] Therefore, the utility model makes full use of the advantage of small outdoor occupation volume to integrate the battery energy system, grid-connected and off-grid PCS system, transformer system, photovoltaic interface, generator interface, mains interface, etc. into an energy storage cabinet. The energy storage cabinet can meet the outdoor application environment and the regional diversity of product layout. The flexible on-site layout can realize the use of multiple systems in cabinets. Moreover, the utility model isolates the battery energy system, grid-connected and off-grid PCS system, and transformer system into separate heat dissipation channels to form three independent heat dissipation systems, avoiding the problem of thermal cascade between the systems, and can increase the protection level to IP55 to meet various outdoor application environments. Therefore, the energy storage cabinet provided by the utility model can be used as a backup power supply to supplement the power load of the enterprise, provide sufficient backup power supply guarantee, and reduce the downtime cost and downtime loss caused by sudden power outages.

[0043] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

[0044] The structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect and purpose that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantial change of the technical content.

[0045] It should be understood that, although the terms first, second, third, etc. may be used to describe centrifugal fans, etc. in the embodiments of the present invention, these centrifugal fans should not be limited to these terms. These terms are only used to distinguish centrifugal fans from each other. For example, without departing from the scope of the embodiments of the present invention, the first centrifugal fan may also be referred to as the second centrifugal fan, and similarly, the second centrifugal fan may also be referred to as the first centrifugal fan.

Claims

1. An energy storage cabinet, characterized in that: The energy storage cabinet comprises: an energy storage cabinet body, wherein the energy storage cabinet body is provided with a plurality of independent areas, wherein a battery energy system for storing and releasing electric energy and a charging and discharging system for charging and discharging the battery energy system are respectively located in different independent areas; The energy storage cabinet body is also provided with a heat dissipation channel for cooling the battery energy system and the charging and discharging system; The charging and discharging system comprises: a DC bus (3), a DC-DC conversion module (4), an on-grid and off-grid PCS system (5), a voltage conversion system (6), a photovoltaic access terminal (7), a generator and a mains access terminal (8); The photovoltaic access terminal (7) is connected to the battery energy system via a DC-DC conversion module (4) and a DC bus (3), so that the electric energy generated by photovoltaic power generation is transmitted to the DC-DC conversion module (4) via the photovoltaic access terminal (7), and is then transmitted to the battery energy system via the DC bus (3) after DC-DC conversion by the DC-DC conversion module (4); The generator and the mains access terminal (8) are connected to the battery energy system through the transformer system (6), the grid-connected and off-grid PCS system (5), and the DC bus (3), respectively, so that the electric energy generated by the generator and the mains is converted and boosted by the transformer system (6) and then transmitted to the grid-connected and off-grid PCS system (5) for grid connection, and is then transmitted to the battery energy system by the grid-connected and off-grid PCS system (5) and the DC bus (3).

2. The energy storage cabinet according to claim 1, characterized in that: The charging and discharging system also includes a load output end (16), and the load output end (16) is connected to the voltage transformation system (6); The load output terminal (16) is used to release electric energy to the outside after the voltage conversion system (6) and the grid-connected PCS system (5) cooperate with each other to convert the direct current of the battery energy system into alternating current.

3. The energy storage cabinet according to claim 2, characterized in that: The battery energy system comprises: a high-voltage box (2), and a battery module connected to the high-voltage box (2) and used for storing and releasing electric energy; The high voltage box (2) is respectively connected to a DC-DC conversion module (4) and an on-grid and off-grid PCS system (5).

4. The energy storage cabinet according to claim 3, characterized in that: The battery module is located in an independent area, the high voltage box (2), the DC-DC conversion module (4), and the on-grid and off-grid PCS system (5) are located in the same independent area, and the transformer system (6) is located in an independent area.

5. The energy storage cabinet according to any one of claims 1 to 4, characterized in that: The battery energy system, the on-grid and off-grid PCS system (5) and the voltage transformation system (6) each have an independent heat dissipation channel.

6. The energy storage cabinet according to claim 5, characterized in that: The air conditioner (9) arranged near the battery module delivers cold air to the rear end of the battery module through the air conditioner cold air outlet (10), and the exhaust extension arranged at the front end of the battery module draws the cold air at the rear end of the battery module to the front end of the battery module and discharges it through the air conditioner hot air inlet (11), thereby forming a heat dissipation channel for the battery energy system.

7. The energy storage cabinet according to claim 5, characterized in that: A first centrifugal fan (13) disposed near the transformer system (6) extracts cold air entering from the bottom of the energy storage cabinet body, so that the extracted cold air flows through the transformer system (6) and is then discharged from the energy storage cabinet body by the first centrifugal fan (13), thereby forming a heat dissipation channel for the transformer system (6).

8. The energy storage cabinet according to claim 5, characterized in that: An axial flow fan (14) arranged near the on-grid and off-grid PCS system (5) blows the hot air inside the on-grid and off-grid PCS system (5) toward the rear end of the energy storage cabinet body, and discharges the hot air out of the energy storage cabinet body through a second centrifugal fan (15) arranged at the rear end of the energy storage cabinet body, thereby forming a heat dissipation channel for the on-grid and off-grid PCS system (5); wherein an air inlet for external air to flow into the on-grid and off-grid PCS system (5) is arranged on the side of the energy storage cabinet body.

9. The energy storage cabinet according to claim 3 or 4, characterized in that: The battery module is composed of a plurality of single battery packs (1) connected in series.

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