Electrochemical energy storage system for energy conservation of public institutions

Abstract

The utility model belongs to the technical field of electrochemical energy storage, and provides an electrochemical energy storage system for energy conservation of public institutions, which comprises a converter cabinet electrically connected with an external power grid, an isolation transformer is arranged between the converter cabinet and the external power grid, a plurality of DC / AC converters are arranged in the converter cabinet, and the DC / AC converters are electrically connected with the external power grid. Each DC / AC converter is connected with a battery pack, a switch is arranged between each DC / AC converter and the isolation transformer, a rectangular shielding cover is arranged outside each DC / AC converter, and positioning structure pairs are arranged on the upper surface, the lower surface, the left surface and the right surface of each shielding cover. And the positioning structure pair is used for being matched with an adjacent shielding case. By adopting the shielding cover DC / AC converter, the independence of the adjacent DC / AC converters can be improved, the electromagnetic interference is reduced, the shielding performance of each converter is improved, the improvement of the system stability is facilitated, and the shielding cover DC / AC converter is suitable for large-scale popularization.

Description

Technical Field

[0001] This utility model belongs to the field of electrochemical energy storage technology, and in particular relates to an electrochemical energy storage system for energy conservation in public institutions. Background Technology

[0002] New energy storage technologies can improve energy efficiency, ensure energy supply security, promote the development of renewable and clean energy, optimize the energy structure, and support the construction of smart grids. Electrochemical energy storage, as a novel energy storage technology, can generate its own electricity during peak grid demand periods and store electrical energy during off-peak periods, achieving the goals of reducing electricity costs and saving energy for industrial and commercial applications.

[0003] Existing patent CN201920114145.2 discloses a string electrochemical energy storage system, including an isolation transformer connected to an external power grid. The isolation transformer is also connected to multiple DC / AC converters, each of which is connected to a battery pack. Each DC / AC converter is installed within the same converter cabinet. This method of connecting multiple branches of the battery pack to the DC / AC converters eliminates the circulating current problem caused by parallel connection of multiple battery branches, improving the energy conversion efficiency of the energy storage system. However, the lack of shielding and the absence of shielding for sensitive components make these components and circuits more susceptible to electromagnetic interference. Furthermore, the electromagnetic interference generated by the system itself is difficult to suppress, and external electromagnetic interference may also enter the converter through the grounding system, leading to control signal distortion and system instability. Utility Model Content

[0004] This invention addresses the technical problems existing in the aforementioned electrochemical energy storage systems by proposing a rationally designed electrochemical energy storage system for energy conservation in public institutions. This system improves the shielding performance of each converter and enhances system stability.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides an electrochemical energy storage system for energy conservation in public institutions, including a converter cabinet electrically connected to an external power grid. An isolation transformer is installed between the converter cabinet and the external power grid. Multiple DC / AC converters are installed inside the converter cabinet. Each DC / AC converter is connected to a battery pack. A switch is installed between each DC / AC converter and the isolation transformer. A rectangular shield is installed outside each DC / AC converter. Positioning structures are provided on the upper, lower, left, and right surfaces of the shield, and these positioning structures are used to cooperate with adjacent shields.

[0006] Preferably, the shielding cover is provided with multiple heat dissipation holes distributed around the upper, left, lower and rear sides of the shielding cover, and the length direction of the heat dissipation holes is consistent with the length direction of the shielding cover.

[0007] Preferably, the positioning structure includes a rectangular positioning opening and a positioning protrusion that mates with the positioning opening.

[0008] Preferably, the depth direction of the positioning port is connected to the heat dissipation hole.

[0009] Preferably, the shielding cover has a device cavity and an air duct cavity arranged at vertical intervals inside, and the end of the shielding cover is provided with a grille and a fan that communicate with the air duct cavity.

[0010] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0011] This utility model provides an electrochemical energy storage system for energy conservation in public institutions. By using shielded DC / AC converters, the independence of adjacent DC / AC converters can be improved, electromagnetic interference can be reduced, the shielding performance of each converter can be improved, the system stability can be improved, and the space utilization rate inside the converter cabinet can be guaranteed, making it suitable for large-scale promotion. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 A schematic diagram of an electrochemical energy storage system for energy conservation in public institutions is provided as an example.

[0014] Figure 2 A front view of the shielding cover provided for an embodiment;

[0015] Figure 3 A schematic diagram showing the distribution of the positioning structure pairs on the shielding cover as provided in the embodiment;

[0016] Figure 4 A bottom view of the shielding cover provided for an embodiment;

[0017] In the above figures, 1. Converter cabinet; 2. Isolation transformer; 3. DC / AC converter; 4. Battery pack; 5. Shielding cover; 51. Positioning structure pair; 511. Positioning port; 512. Positioning protrusion; 52. Heat dissipation hole; 53. Component cavity; 54. Air duct cavity; 55. Fan. Detailed Implementation

[0018] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" appearing below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0019] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0020] Examples, such as Figures 1-4 As shown, this utility model provides an electrochemical energy storage system for energy conservation in public institutions, including a converter cabinet 1 electrically connected to an external power grid, an isolation transformer 2 between the converter cabinet 1 and the external power grid, multiple DC / AC converters 3 inside the converter cabinet 1, each DC / AC converter 3 connected to a battery pack 4, a switch between each DC / AC converter 3 and the isolation transformer 2, and a switch between the isolation transformer 2 and the external power grid. Furthermore, each DC / AC converter 3 is provided with a rectangular shield 5 on its exterior. The shield 5 has six sides, and positioning structures 51 are provided on the upper and lower surfaces and the left and right surfaces of the shield 5. The positioning structures 51 are used to cooperate with adjacent shields 5. This system, on the one hand, connects all four branches of the battery packs to the converter cabinet 1, eliminating the circulating current problem caused by the parallel connection of multiple branches of the battery packs; on the other hand, by using shielded covers 5 for the DC / AC converters 3, the independence of adjacent DC / AC converters 3 can be improved, electromagnetic interference can be reduced, the shielding performance of each converter can be improved, and the system stability can be improved; furthermore, the positioning structure pair 51 can make adjacent shielded covers 5 form a stable and correct assembly relationship inside the converter cabinet 1, which is conducive to ensuring the space utilization rate inside the converter cabinet 1.

[0021] Considering that the airflow for heat dissipation in a typical converter cabinet 1 blows from the front to the back, in order to improve the heat dissipation performance between adjacent DC / AC converters 3, the shielding cover 5 provided in this utility model is provided with multiple heat dissipation holes 52 distributed around the upper, left, lower, and rear sides of the shielding cover 5, and the length direction of the heat dissipation holes 52 is consistent with the length direction of the shielding cover 5. In this way, a certain gap is left between adjacent shielding covers 5 to allow airflow to pass through, which is beneficial to improving the heat dissipation effect between adjacent DC / AC converters 3.

[0022] To improve the positioning and assembly effect of the shielding cover 5, the positioning structure pair 51 provided by this utility model includes a rectangular positioning port 511 and a positioning protrusion 512 that cooperates with the positioning port 511. The positioning protrusions 512 on the same side are arranged in pairs, and the positioning ports 511 on the same side are also arranged in pairs. Moreover, the area of ​​the positioning protrusion 512 on the top surface is larger than the area of ​​the positioning protrusion 512 on the side surface. The position of adjacent shielding covers 5 is effectively determined by the cooperation of the positioning port 511 and the positioning protrusion 512, so that all DC / AC converters 3 are arranged in an array distribution of n x m after installation. Furthermore, the depth direction of the positioning port 511 is connected to the heat dissipation hole 52, and the thickness of the positioning protrusion 512 is less than 3 mm, which also helps to improve the heat dissipation performance between adjacent shielding covers 5.

[0023] Furthermore, the internal structure of the shielding cover 5 of this utility model adopts a split upper and lower structure, such as providing device cavities 53 and air duct cavities 54 distributed vertically at intervals. Panels are provided at the front and rear ends of both device cavities 53 and air duct cavities 54. A grille and a fan communicating with the air duct cavity 54 are provided at the end of the shielding cover 5. The opening of the grille is less than 1.5mm to ensure the shielding performance of the shielding cover 5. By adopting a split upper and lower design, the DC / AC converter 3 can improve the protection performance of the shielding cover 5 for electrical components and enhance the heat dissipation performance inside the shielding cover 5.

[0024] 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 other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. An electrochemical energy storage system for public institution energy saving, comprising a converter cabinet electrically connected with an external power grid, an isolation transformer is arranged between the converter cabinet and the external power grid, a plurality of DC / AC converters are arranged in the interior of the converter cabinet, each of the DC / AC converters is connected with a battery pack, and a switch is arranged between each of the DC / AC converters and the isolation transformer, characterized in that, The DC / AC converter is externally provided with a rectangular shielding cover, and positioning structure pairs are arranged on the upper and lower surfaces and the left and right surfaces of the shielding cover to cooperate with adjacent shielding covers.

2. An electrochemical energy storage system for energy conservation in public facilities according to claim 1, wherein, The shielding cover is provided with a plurality of heat dissipation holes, and the length direction of the heat dissipation holes is consistent with the length direction of the shielding cover.

3. An electrochemical energy storage system for energy conservation in public facilities according to claim 2, wherein, The positioning structure pairs comprise rectangular positioning openings and positioning protrusions matched with the positioning openings.

4. An electrochemical energy storage system for public institutions energy saving according to claim 3, characterized in that, The depth direction of the positioning openings is communicated with the heat dissipation holes.

5. The electrochemical energy storage system for public institutions energy saving according to claim 1 or 4, characterized in that, The inner part of the shielding cover is provided with device cavities and air duct cavities which are spaced apart in an up-down direction, and the end part of the shielding cover is provided with a grille and a fan which are communicated with the air duct cavities.

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