Energy storage battery cluster and cascade type energy storage battery cluster

Abstract

The utility model relates to an energy storage battery cluster and a cascade type energy storage battery cluster, the energy storage battery cluster comprises a cluster frame, a battery pack, an energy storage converter and a high-voltage box, and the connecting surface of the cluster frame is provided with an accommodating space; the battery pack is arranged in the cluster frame corresponding to the long side direction of the accommodating space; the energy storage converter and the high-voltage box are arranged in the cluster frame corresponding to the thickness direction of the accommodating space, and the energy storage converter and the high-voltage box are sequentially connected with the battery pack. The battery cluster is arranged through the L-shaped cluster frame layout, the size of the battery pack is large, the battery pack is arranged in the long side of the cluster frame, the size of the energy storage converter and the size of the high-voltage box are small, and the energy storage converter and the high-voltage box are arranged in the short side, so that the space utilization efficiency is effectively optimized, the power transmission path can be simplified, electrical connection is facilitated, and the use of connecting wires can be reduced; the cost is saved.

Description

Technical Field

[0001] This utility model relates to the field of energy storage technology, and in particular to an energy storage battery cluster and a cascaded energy storage battery cluster. Background Technology

[0002] In recent years, with the development of wind power and photovoltaics, the demand for power auxiliary services such as peak shaving, frequency regulation, and output smoothing in power systems has increased significantly, leading to the rapid development of energy storage technology. Electrochemical energy storage, due to its fast response, short construction period, flexible application, and high conversion efficiency, has become the mainstream energy storage method. The energy storage battery compartment is a key unit in an electrochemical energy storage system, consisting of multiple battery clusters integrated according to certain rules.

[0003] Currently, based on power transmission technology, electrochemical energy storage systems can be divided into two types: low-voltage boost type and medium-high voltage cascade type. As an emerging technology, the medium-high voltage cascade type energy storage system uses battery packs to achieve voltage boost through inversion and series connection. It has fast response and high efficiency, making it suitable for large-capacity energy storage applications and has broad market prospects.

[0004] However, current cascaded batteries, which assemble battery clusters vertically, result in excessively tall cabins, making them inconvenient for transportation and cascaded copper busbar layout. Utility Model Content

[0005] This utility model provides an energy storage battery cluster and a cascaded energy storage battery cluster to solve the technical problems of excessive height of the cascaded battery compartment and large amount of copper busbars used in the cascaded layout.

[0006] This utility model provides an energy storage battery cluster, comprising:

[0007] A cluster frame, wherein the connecting surface of the cluster frame is provided with a receiving space;

[0008] The battery pack is disposed in the cluster frame corresponding to the long side of the accommodating space;

[0009] An energy storage converter and a high-voltage box are arranged in the cluster frame corresponding to the thickness direction of the accommodating space, and the energy storage converter and the high-voltage box are connected to the battery pack in sequence.

[0010] In one embodiment, the interfaces of the energy storage converter, the high-voltage box, and the battery pack are oriented in the same direction, and the interfaces of the energy storage converter and the high-voltage box are both located on the outer surface of the cluster frame in the width direction.

[0011] In one embodiment, the battery pack includes a plurality of battery packs connected in series.

[0012] A cascaded energy storage battery cluster includes the battery cluster described in any one of the above technical solutions, wherein there are at least two battery clusters, the battery clusters are stacked, and adjacent battery clusters are arranged in a centrally symmetrical manner.

[0013] In one embodiment, an insulating pad is provided at the connection position of adjacent cluster frames. The adjacent cluster frames are fixedly connected by an insulating sleeve and a bolt. The insulating sleeve is embedded in the insulating pad. The bolt passes through the insulating sleeve and the two cluster frames. One end of the bolt is pressed onto the cluster frame through the insulating sleeve, and the other end of the bolt is pressed directly onto the cluster frame.

[0014] In one embodiment, a retaining ring is integrally formed on the outer side of the insulating sleeve, and the retaining ring contacts the connecting surface of the cluster frame.

[0015] In one embodiment, the housing spaces of adjacent battery clusters are correspondingly arranged, and the energy storage converters and high-voltage boxes of adjacent battery clusters are respectively arranged in the housing spaces of each other.

[0016] In one embodiment, the gaps of adjacent battery clusters are provided correspondingly, and the energy storage converters and high-voltage boxes of adjacent battery clusters are respectively arranged in the receiving space of each other.

[0017] In one embodiment, copper busbars connecting the two energy storage converters are disposed in the housing space.

[0018] In one embodiment, an insulating component is fixedly disposed below the lowest cluster frame.

[0019] In one embodiment, the insulation assembly includes multiple insulating king beams arranged in an H-shape below the cluster frame.

[0020] Compared with the prior art, the advantages of this utility model are:

[0021] The battery clusters are arranged in an L-shaped rack layout. Since the battery packs are relatively large, they are placed on the long side of the rack. Since the energy storage converter and high-voltage box are relatively small, they are placed on the short side. This effectively optimizes space utilization efficiency, simplifies power transmission paths, facilitates electrical connections, reduces the use of connecting wires, and saves costs.

[0022] By arranging at least two battery clusters in a stacked and centrally symmetrical manner, the modular expansion of cascaded energy storage battery clusters is achieved. The energy storage capacity can be flexibly increased or decreased according to actual needs. The gaps between adjacent battery clusters can also be used to correspondingly arrange the battery clusters, reducing the space occupied by the battery cluster combination. At the same time, the energy storage converters and high-voltage boxes in the two battery clusters with corresponding gaps are arranged in the same height space, reducing the space occupied by one layer of energy storage converters and high-voltage boxes, and reducing the waste of cables for connecting adjacent energy storage converters. The energy storage converters and high-voltage boxes can be arranged in the middle layer of the cascaded battery clusters, ensuring sufficient creepage distance, reducing the possibility of leakage, and ensuring the safety of the entire cascaded battery cluster. Attached Figure Description

[0023] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0024] Figure 1 This utility model provides an overall structural schematic diagram of an energy storage battery cluster;

[0025] Figure 2 This utility model provides a side view of the structure of an energy storage battery cluster.

[0026] Figure 3 This utility model provides a schematic diagram of the cluster frame structure in an energy storage battery cluster;

[0027] Figure 4 This is one of the schematic diagrams of the cluster frame connection structure of this utility model;

[0028] Figure 5 This is the second schematic diagram of the cluster frame connection structure of this utility model.

[0029] Figure label:

[0030] 1-Cluster frame; 2-Battery pack; 21-Battery bundle; 3-Energy storage converter; 4-High voltage box; 5-Insulating pad; 6-Insulating king beam; 7-Accommodation space; 8-Insulating sleeve; 9-Bolt; 10-Retaining ring. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings.

[0032] like Figure 3 As shown, the length direction of the cluster frame 1 is the long side direction of the accommodating space 7, i.e., direction A, and the width direction of the cluster frame 1 is the thickness direction of the accommodating space 7, i.e., direction B.

[0033] like Figures 1-3As shown, this utility model provides an energy storage battery cluster, including a cluster frame 1. A receiving space 7 is provided on the connecting surface of the cluster frame 1. In this embodiment, the cluster frame is L-shaped. A battery pack 2 is arranged in the cluster frame 1 corresponding to the long side direction of the receiving space 7. An energy storage converter 3 and a high-voltage box 4 are arranged in the cluster frame 1 corresponding to the thickness direction of the receiving space 7. The energy storage converter 3 and the high-voltage box 4 are connected to the battery pack 2 in sequence.

[0034] The battery clusters are arranged in an L-shaped frame 1. The battery pack 2 is relatively large, so it is placed in the frame 1 corresponding to the long side of the accommodating space 7. The energy storage converter 3 and the high-voltage box 4 are relatively small, so they are placed in the frame 1 corresponding to the thickness of the accommodating space 7. This effectively optimizes space utilization efficiency, simplifies the power transmission path, facilitates electrical connection, reduces the use of connecting wires, and saves costs.

[0035] Preferably, the interfaces of the energy storage converter 3, the high-voltage box 4, and the battery pack 2 are all oriented in the same direction, and the interfaces of the energy storage converter 3 and the high-voltage box 4 are all located on the outer side of the L-shaped frame 1 in the width direction. This unifies the interface orientation, simplifies the installation and maintenance process, and reduces the risk of misoperation.

[0036] Preferably, the battery pack 2 includes multiple battery packs 21 connected in series. In this embodiment, each battery pack 2 is composed of three 104-cell battery packs 21 connected in series, making the entire battery pack 2 more compact and improving space utilization.

[0037] A cascaded energy storage battery cluster includes a battery cluster according to any one of the above technical solutions, wherein there are at least two battery clusters, the battery clusters are stacked and arranged in a centrally symmetrical manner with adjacent battery clusters.

[0038] Specifically, the cascaded energy storage battery cluster can be set up with two sets of battery clusters. The housing space 7 of the two adjacent battery clusters is set up accordingly. The energy storage converter 3 and high voltage box 4 of the adjacent battery clusters are respectively set in the housing space 7 of each other. This can make the outer surface of the cascaded energy storage battery clusters on the same plane, reduce the space occupation in the horizontal direction, and make the overall structure more neat. In addition, the copper busbar connecting the two energy storage converters 3 is set in the housing space 7, which can make the wiring simpler and more orderly.

[0039] By correspondingly setting the accommodating spaces 7 of adjacent battery clusters, the vertical space occupied by the battery cluster combination is reduced. At the same time, the energy storage converter 3 and high voltage box 4 in the two battery clusters corresponding to the accommodating spaces 7 are arranged in the same height space, reducing the space occupied by one layer of energy storage converter 3 and high voltage box 4, and reducing the waste of cables for connecting adjacent energy storage converter 3. The energy storage converter 3 and high voltage box 4 can be arranged in the middle layer of the cascaded battery cluster, ensuring sufficient creepage distance, reducing the possibility of leakage, and ensuring the safety of the entire cascaded battery cluster.

[0040] The cascaded energy storage battery cluster can also be set up with multiple battery clusters. The long sides of the two bottom battery clusters are respectively set in the gaps of the L-shaped cluster frame 1 of each other. The third battery cluster is set up in line with the long side of the second battery cluster. Then, the stacking is repeated to realize the modular expansion of the cascaded energy storage battery cluster. The energy storage capacity can be flexibly increased or decreased according to actual needs.

[0041] In a medium- and high-voltage cascaded energy storage system, battery pack 2 is inverted and connected in series through energy storage converter 3, and the voltage of the battery cluster increases step by step. In this battery cluster, the voltage of a single cluster can reach 1100V.

[0042] Preferred, such as Figure 3 , Figure 4 As shown, an insulating pad 5 is provided at the connection position of adjacent cluster frames 1, and adjacent cluster frames 1 are fixedly connected by an insulating sleeve 8 and a bolt 9. The insulating sleeve 8 is made of SMC material and is embedded in the insulating pad 5. The bolt 9 passes through the insulating sleeve 8 and the two cluster frames 1. One end of the bolt 9 is pressed onto the cluster frame 1 through the insulating sleeve 8, and the other end of the bolt 9 is directly pressed onto the cluster frame 1. The bolt direction is vertical, and the bolt is at the same potential as the upper cluster frame 1 and has a potential difference with the lower cluster frame 1. This ensures the stability of the connection structure between the upper and lower cluster frames 1 while providing sufficient electrical clearance and creepage distance for the upper and lower cluster frames 1.

[0043] Furthermore, such as Figure 5 As shown, a retaining ring 10 is integrally formed on the outer side of the insulating sleeve 8. The retaining ring 10 contacts the connecting surface of the cluster frame. The retaining ring provides support for the insulating sleeve 8. At the same time, the retaining ring 10 is integrally formed with the insulating sleeve 8, which increases the creepage distance of the bolt 9.

[0044] An insulating assembly is fixedly installed below the lowest cluster frame 1. The insulating assembly includes multiple insulating king beams 6, which are arranged in an H-shape below the cluster frame 1. The insulating king beams 6 are made of SMC material. At the four corners along the length direction below the cluster frame 1, an insulating king beam 6 is set, and at the middle position of the cluster frame 1 along the width direction, so that the insulating king beams 6 are arranged in an H-shape to ensure the stability of the structure. The height of the insulating king beams 6 is not less than 300mm, which meets the electrical clearance requirements and ensures sufficient creepage distance to prevent high voltage from causing damage to maintenance personnel and equipment inside the cabin.

[0045] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An energy storage battery cluster, characterized in that, include: A cluster frame, wherein the connecting surface of the cluster frame is provided with a receiving space; The battery pack is disposed in the cluster frame corresponding to the long side of the accommodating space; An energy storage converter and a high-voltage box are arranged in the cluster frame corresponding to the thickness direction of the accommodating space, and the energy storage converter and the high-voltage box are connected to the battery pack in sequence.

2. The energy storage battery cluster according to claim 1, characterized in that, The interfaces of the energy storage converter, the high-voltage box, and the battery pack are oriented in the same direction, and the interfaces of the energy storage converter and the high-voltage box are both located on the outer side of the cluster frame in the width direction.

3. The energy storage battery cluster according to claim 1, characterized in that, The battery pack comprises multiple battery packs connected in series.

4. A cascaded energy storage battery cluster, characterized in that, The battery clusters include any one of claims 1-3, wherein there are at least two groups of battery clusters, the battery clusters are stacked, and adjacent battery clusters are arranged in a centrally symmetrical manner.

5. The cascaded energy storage battery cluster according to claim 4, characterized in that, An insulating pad is provided at the connection position of the adjacent clusters. The adjacent clusters are fixedly connected by an insulating sleeve and bolts. The insulating sleeve is embedded in the insulating pad. The bolt passes through the insulating sleeve and the two clusters. One end of the bolt is pressed on the cluster through the insulating sleeve, and the other end of the bolt is pressed directly on the cluster.

6. The cascaded energy storage battery cluster according to claim 5, characterized in that, The outer side of the insulating sleeve is integrally formed with a retaining ring, which is in contact with the connecting surface of the cluster frame.

7. The cascaded energy storage battery cluster according to claim 4, characterized in that, The accommodating spaces of adjacent battery clusters are respectively arranged in the accommodating spaces of each other.

8. The cascaded energy storage battery cluster according to claim 7, characterized in that, The copper busbars connecting the two energy storage converters are arranged in the housing space.

9. The energy storage battery cluster according to claim 4, characterized in that, An insulating component is fixedly installed below the lowest cluster frame.

10. The energy storage battery cluster according to claim 9, characterized in that, The insulation assembly includes multiple insulating king beams arranged in an H-shape below the cluster frame.

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