A containerized electric energy storage system

Abstract

The present invention relates to a container power energy storage system. The container power energy storage system includes a PCS layer, which includes multiple PCSs, a step-up transformer, a communication cabinet, a power distribution cabinet, a switch cabinet, and a control cabinet. The communication cabinet is used for power distribution of the PCS layer and communication between various devices. The power distribution cabinet is used for low-voltage switches of the PCS layer. The switch cabinet is used for medium-voltage switches of the PCS layer. The control cabinet is used to control each PCS; a first battery layer and a second battery layer, which have the same structure and each include multiple battery clusters and busbar cabinets. Multiple battery clusters are connected to the busbar cabinet in groups, and the busbar cabinet is connected to the DC side of the PCS layer through power cables; the PCS layer, the first battery layer, and the second battery layer are each accommodated in a container and stacked vertically from bottom to top in sequence. The present invention provides a container power energy storage system with a simple overall design, which can improve the usability of the container energy storage system.

Description

Technical Field

[0001] The present invention relates to the technical field of electric energy storage, and particularly to a container electric energy storage system. Background Art

[0002] In recent years, energy storage technologies at home and abroad have developed rapidly. Containerized energy storage systems have the advantages of mature technology, large capacity, mobility, high reliability, no pollution, strong adaptability, scalability, and easy installation. Container energy storage systems are of great significance for the standardization and low-cost of energy storage systems, can greatly improve the usability and stability of energy storage systems, are beneficial to the development of distributed microgrid energy storage systems, and are the future development direction of energy storage.

[0003] At present, the power generation side container energy storage system mainly consists of energy storage battery clusters, battery management systems (BMS), energy storage converters (PCS), energy storage energy management systems (EMS), etc. Containerized battery energy storage systems generally use lithium iron phosphate batteries as the energy carrier, and charge and discharge through PCS to achieve various energy exchanges with the power system and can be connected to various power supply modes.

[0004] At present, energy storage projects generally mainly adopt the arrangement method of single-layer distribution and arrangement of containers. The disadvantages of this arrangement method are:

[0005] (1) It occupies a large amount of land area and has low land use efficiency. The single-layer arrangement method of containers in conventional energy storage projects and the safety distance between containers occupy a large amount of land area, which will have a certain impact on those enterprises with tight land resources, and may have to reduce the configuration scale of energy storage projects in the preliminary planning.

[0006] (2) Due to the single-layer distribution and arrangement of energy storage containers, the cost of connection cables between container modules increases, increasing the cost of energy storage projects. Summary of the Invention

[0007] In view of the above problems of the prior art, the present invention proposes a container electric energy storage system with a simple overall design, which can improve the usability of the container energy storage system.

[0008] Specifically, the present invention proposes a container electric energy storage system, including a PCS layer, which includes multiple PCSs, step-up transformers, communication cabinets, distribution cabinets, switch cabinets, and control cabinets. The communication cabinet is used for power distribution of the PCS layer and communication between devices. The distribution cabinet is used for low-voltage switches of the PCS layer. The switch cabinet is used for medium-voltage switches of the PCS layer. The control cabinet is used to control each PCS;

[0009] The first battery layer and the second battery layer, having the same structure, each include multiple sets of battery clusters and busbar cabinets. Multiple sets of the battery clusters are connected to the busbar cabinets in groups, and the busbar cabinets are connected to the DC side of the PCS layer through power cables.

[0010] The PCS layer, the first battery layer, and the second battery layer are each accommodated in a container and are stacked vertically from bottom to top in sequence.

[0011] According to an embodiment of the present invention, it further includes a HVAC terminal. An air-conditioning air inlet and return outlet are provided on one long side of the container of the PCS layer, and the HVAC terminal is communicated with the air-conditioning air inlet and return outlet for controlling the internal temperature of the PCS layer.

[0012] According to an embodiment of the present invention, the cross-sectional area of the air-conditioning air inlet and return outlet is determined according to the heat generation amount when the PCS layer is working.

[0013] According to an embodiment of the present invention, the first battery layer and the second battery layer further include fire-fighting equipment, and the fire-fighting equipment is connected to smoke sensors and temperature sensors arranged in the first battery layer and the second battery layer.

[0014] According to an embodiment of the present invention, a cooling device is provided in the first battery layer and the second battery layer, including multiple finned tube heat exchangers and a chilled water supply circuit connected to the finned tube heat exchangers.

[0015] According to an embodiment of the present invention, multiple battery clusters in the first battery layer are divided into two groups and are attached to one long side of the container where they are located. There are 2 busbar cabinets, which are respectively attached to one long side of the container where they are located, and the battery clusters on the same side are connected to the busbar cabinet on the same side.

[0016] According to an embodiment of the present invention, it further includes a first connecting plate, which is arranged at the bottom of the container where the PCS layer is located and is fixedly connected to the external foundation.

[0017] According to an embodiment of the present invention, it further includes a second connecting plate, which is used to connect the bottom of the container where the first battery layer is located and the top of the container where the PCS layer is located.

[0018] According to an embodiment of the present invention, it further includes corner fitting pads, which are used to connect and fix the short side joints of the containers where the first battery layer, the second battery layer, and the PCS layer are located.

[0019] According to an embodiment of the present invention, it further includes a staircase and staircase connectors. The staircase connectors are arranged on one short side of the first battery layer and the second battery layer, and the staircase is fixed on both sides of the container power energy storage system through the staircase connectors.

[0020] A container power energy storage system provided by the present invention stacks the PCS layer and the battery layer, saving floor space and reducing the cost of cable use, and improving the utilization efficiency of the container power energy storage system.

[0021] It should be understood that the above general description and the following detailed description of the present invention are both exemplary and explanatory, and are intended to provide further explanation of the present invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings are included to provide a further understanding of the present invention, and they are incorporated into and constitute a part of this application. The drawings illustrate embodiments of the present invention and, together with this specification, serve to explain the principles of the present invention. In the drawings:

[0023] Figure 1 Shows the structural schematic diagram of the container power energy storage system according to an embodiment of the present invention.

[0024] Figure 2 Shows the structural schematic diagram of the PCS layer.

[0025] Figure 3 Shows the structural schematic diagram of the first battery layer.

[0026] Figure 4 Shows an enlarged schematic diagram of the connection structure and connection components of each container in an embodiment of the present invention.

[0027] Among them, the above-mentioned drawings include the following reference numerals:

[0028] Container power energy storage system 100, PCS layer 101

[0029] First battery layer 102, Second battery layer 103

[0030] PCS 104, Step-up transformer 105

[0031] Communication cabinet 106, Power distribution cabinet 107

[0032] Switch cabinet 108, Control cabinet 109

[0033] Battery cluster 110, Busbar cabinet 111

[0034] HVAC terminal 112, Air conditioner supply and return air vents 113

[0035] Fire protection equipment 114, Surface cooler 115

[0036] Chilled water supply loop 116, First connecting plate 117

[0037] Second connecting plate 118, angle piece backing plate 119

[0038] Staircase 120, staircase connecting piece 121 Specific implementation manners

[0039] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other.

[0040] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restricts the present application and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

[0041] It should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless otherwise clearly specified in the context, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations.

[0042] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationship. Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0043] In the description of the present application, it should be understood that the orientation or positional relationship indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present application and simplifying the description. Without contrary description, these orientation terms do not indicate and imply that the device or component referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present application; the orientation terms "inner, outer" refer to the inside and outside relative to the contour of each component itself.

[0044] For the sake of convenience in description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "upper...", etc. can be used here to describe the spatial positional relationship between a device or feature shown in the drawings and other devices or features. It should be understood that the spatial relative terms are intended to cover different orientations in use or operation in addition to the orientation described in the drawings for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0045] In addition, it should be noted that the use of terms such as "first", "second", etc. to limit components is only for the convenience of differentiating the corresponding components. Without additional statement, the above terms have no special meaning. Therefore, it should not be construed as a limitation on the protection scope of the present application. In addition, although the terms used in the present application are selected from well-known and commonly used terms, some of the terms mentioned in the specification of the present application may be selected by the applicant according to his or her judgment, and their detailed meanings are described in the relevant parts of the description herein. In addition, it is required to understand the present application not only through the actual terms used, but also through the meaning implied by each term.

[0046] Figure 1 The structural schematic diagram of the container power energy storage system according to an embodiment of the present invention is shown. Figure 2 The structural schematic diagram of the PCS layer is shown. As shown in the figure, a container power energy storage system 100 mainly includes a PCS layer 101, a first battery layer 102 and a second battery layer 103.

[0047] Reference Figure 2, the PCS layer 101 includes multiple PCSs 104, a step-up transformer 105, a communication cabinet 106, a power distribution cabinet 107, a switch cabinet 108, and a control cabinet 109. Among them, the communication cabinet 106 is used for power distribution of the PCS layer 101 and communication among various devices. The power distribution cabinet 107 is used for low-voltage switches of the PCS layer 101, the switch cabinet 108 is used for medium-voltage switches of the PCS layer 101, and the control cabinet 109 is used to control each PCS 104. In the PCS layer 101, the step-up transformer 105, the switch cabinet 108, etc. are integrated together to form a primary step-up cabin.

[0048] Reference Figure 3 , the structures of the first battery layer 102 and the second battery layer 103 are the same. Taking the first battery layer 102 as an example, the first battery layer 102 includes multiple sets of battery clusters 110 and a busbar cabinet 111. Multiple sets of battery clusters 110 are connected to the busbar cabinet 111 by groups, and the busbar cabinet 111 is connected to the DC side of the PCS layer 101 through power cables.

[0049] The PCS layer 101, the first battery layer 102, and the second battery layer 103 are each accommodated in a container and stacked vertically one above the other in sequence.

[0050] The containerized power energy storage system 100 provided by the present invention adopts a stacking method, which saves the floor space of the system and reasonably shortens the distance of cable connection between each other, thereby reducing the cost and improving the utilization efficiency of the containerized power energy storage system 100.

[0051] The container size can be selected according to the actual operating project. For example, the standard container size of 40 to 50 feet can be selected. Selecting the same container size for the PCS layer 101, the first battery layer 102, and the second battery layer 103 can facilitate operations such as stacking and connection implementation.

[0052] Preferably, the containerized power energy storage system 100 further includes a HVAC terminal 112. An air-conditioning air inlet and return outlet 113 is provided on one long side of the container of the PCS layer 101. The HVAC terminal 112 is communicated with the air-conditioning air inlet and return outlet 113 to form an air path circulation between the container and the outside, which is used to control the internal temperature of the PCS layer 101. More preferably, the cross-sectional area of the air-conditioning air inlet and return outlet 113 is determined according to the heat generation amount during the operation of the PCS layer 101. This structure strictly controls the operating temperature of the containerized power energy storage system 100 within the optimal operating temperature range, ensuring the stable operation of the containerized power energy storage system 100.

[0053] Preferably, reference Figure 3, taking the first battery layer 102 as an example, the first battery layer 102 includes a fire-fighting device 114, and the fire-fighting device 114 is connected to a smoke sensor and a temperature sensor disposed in the first battery layer 102. The fire-fighting device 114 can determine whether to perform automatic fire extinguishing or trigger an audible and visual or remote alarm according to the feedback signals of the smoke sensor and the temperature sensor, and the staff can start the fire-fighting equipment to work.

[0054] Preferably, a cooling device is provided in the first battery layer 102 and the second battery layer 103. Taking the first battery layer 102 as an example, it includes a plurality of surface coolers 115 and a chilled water supply circuit 116 connected to the surface coolers 115 to cool the interior of the container where the first battery layer 102 is located.

[0055] It should be noted that, in the embodiments of the present invention, 5MW / MWh is taken as an example of an energy storage unit module, and according to the actual situation, the number of PCS 104 in the PCS layer 101 and the number of battery clusters 110 in the first battery layer 102 and the second battery layer 103 can be adjusted to meet the engineering requirements. In this embodiment, 8 sets of PCS104 are provided in the PCS layer 101, and 12 sets of battery clusters 110 are provided in each of the first battery layer 102 and the second battery layer 103. It is easy to understand that the conventional configuration requirement is that every three sets of battery clusters 110 are correspondingly connected to 1 set of PCS 104.

[0056] Preferably, referring to Figure 3 , the 12 sets of battery clusters 110 in the first battery layer 102 are divided into two groups, with 6 sets in each group, and they are attached to one long side of the container where they are located. There are 2 bus coupler cabinets 111, which are respectively attached to one long side of the container where they are located. The 6 sets of battery clusters 110 on the same side are connected into the bus coupler cabinet 111 on the same side. Such a setting facilitates the wiring of the cables, shortens the connection distance, can reduce the number of output cables, and thus reduces the cost of cable use as a whole.

[0057] Figure 4 shows an enlarged schematic diagram of the connection structure and connection components of each container in an embodiment of the present invention. As shown in the figure, the container power energy storage system 100 further includes a first connecting plate 117. The first connecting plate 117 is disposed at the bottom of the container where the PCS layer 101 is located and is fixedly connected to the external foundation.

[0058] Preferably, the container power energy storage system 100 further includes a second connecting plate 118. The second connecting plate 118 is used to connect the bottom of the container where the first battery layer 102 is located to the top of the container where the PCS layer 101 is located, so that the first battery layer 102 and the PCS layer 101 are fixedly connected.

[0059] Preferably, the container power energy storage system 100 further includes corner fitting pads 119. The corner fitting pads 119 are used to connect and fix the short-side joints of the containers where the first battery layer 102, the second battery layer 103, and the PCS layer 101 are located, so that the three containers including the PCS layer 101, the first battery layer 102, and the second battery layer 103 can be stacked neatly up and down. More preferably, columns can be installed at the four corners of the stacked containers for reinforcement to enhance wind resistance.

[0060] Combined Figure 1 As shown, preferably, the container power energy storage system 100 further includes a staircase 120 and staircase connectors 121. The staircase connectors 121 are arranged on the short-side of the first battery layer 102 and the second battery layer 103, and the staircase 120 is fixed to both sides of the container power energy storage system 100 through the staircase connectors 121. Doors are opened on the short sides of the containers where the first battery layer 102 and the second battery layer 103 are located, so that staff can conveniently enter the interior of the containers for regular inspections.

[0061] The container power energy storage system provided by the present invention can meet the strength requirements of static load and earthquake resistance of magnitude 8.

[0062] Currently, domestic container energy storage projects generally mainly adopt a single-layer distribution arrangement of containers. The disadvantage of this arrangement is that it occupies a large amount of land area, cannot make efficient use of land, and the cost of connecting cables between containers is relatively high. The container power energy storage system provided by the present invention adopts a three-layer stacked arrangement method, integrating structure, electrical, HVAC, and fire protection designs. Through integrated design, it has the advantages of saving floor area, meeting relatively small installation sites and construction restrictions, and saving the cost of connecting cables between modules.

[0063] It will be apparent to those skilled in the art that various modifications and variations can be made to the above exemplary embodiments of the present invention without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention cover modifications and variations of the present invention falling within the scope of the appended claims and their equivalent technical solutions.

Claims

1. A container power energy storage system, comprising: The PCS layer, including multiple PCSs, step-up transformers, communication cabinets, power distribution cabinets, switch cabinets and control cabinets. The communication cabinet is used for power distribution of the PCS layer and communication between devices. The power distribution cabinet is used for low-voltage switches of the PCS layer. The switch cabinet is used for medium-voltage switches of the PCS layer. The control cabinet is used to control each PCS; The first battery layer and the second battery layer, with the same structure, each including multiple battery clusters and busbar connection cabinets. Multiple sets of the battery clusters are connected to the busbar connection cabinet in groups. The busbar connection cabinet is connected to the DC side of the PCS layer through power cables; The PCS layer, the first battery layer and the second battery layer are each accommodated in a container and stacked vertically from bottom to top in sequence.

2. The container power energy storage system according to claim 1, characterized in that, It further includes a HVAC terminal. An air-conditioning air inlet and return air opening is provided on one long side of the container of the PCS layer. The HVAC terminal is communicated with the air-conditioning air inlet and return air opening and is used to control the internal temperature of the PCS layer.

3. The container power energy storage system according to claim 2, wherein The cross-sectional area of the air-conditioning air inlet and return air opening is determined according to the heat generation amount when the PCS layer is working.

4. The container power energy storage system according to claim 1, wherein, The first battery layer and the second battery layer further include fire-fighting equipment, which is connected to smoke sensors and temperature sensors arranged in the first battery layer and the second battery layer.

5. The container power energy storage system according to claim 1, wherein Cooling equipment is provided in the first battery layer and the second battery layer, including multiple finned tube heat exchangers and a chilled water supply circuit connected to the finned tube heat exchangers.

6. The container power energy storage system according to claim 1, wherein The multiple battery clusters in the first battery layer are divided into two groups and are attached to one long side of the container where they are located. There are 2 busbar connection cabinets, which are respectively attached to one long side of the container where they are located. The battery clusters on the same side are connected to the busbar connection cabinet on the same side.

7. The container power energy storage system according to claim 1, wherein It further includes a first connecting plate, which is arranged at the bottom of the container where the PCS layer is located and is fixedly connected to the external foundation.

8. The container power energy storage system according to claim 1, wherein It further includes a second connecting plate, which is used to connect the bottom of the container where the first battery layer is located to the top of the container where the PCS layer is located.

9. The container power energy storage system according to claim 1, wherein, It further includes corner fitting pads, which are used to connect and fix the short-side joints of the containers where the first battery layer, the second battery layer and the PCS layer are located.

10. The container power energy storage system according to claim 1, characterized in that, It further includes a staircase and staircase connectors. The staircase connectors are arranged on one short side of the first battery layer and the second battery layer. The staircase is fixed to both sides of the container power energy storage system through the staircase connectors.

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