Energy storage noise reduction structure, design method and energy storage system

Abstract

This invention relates to the field of energy storage noise reduction technology, and discloses an energy storage noise reduction structure, including a first partition plate, a second partition plate, and a cabinet bottom plate, as well as a first cover and a second cover. The first cover and the second cover are respectively connected to the interior of the cabinet. The lower end face of the first cover is provided with an air inlet, and the interior of the second cover is provided with a third partition plate. One end face of the second cover is respectively provided with a first air outlet and a second air outlet, which are respectively located on the upper cavity and the lower cavity. The inner walls of the first cover and the second cover are both provided with sound-absorbing cotton. The first cover, the first partition plate, the second partition plate, and the upper cavity enclose to form a first air duct, through which air enters from the air inlet, passes through the first air duct, and is then discharged from the first air outlet. The first cover, the second partition plate, the cabinet bottom plate, and the lower cavity enclose to form a second air duct, through which air enters from the air inlet, passes through the second air duct, and is then discharged from the second air outlet. This invention can reduce noise in energy storage cabinets at any time, regardless of the location.

Description

Technical Field

[0001] This invention relates to the field of energy storage and noise reduction technology, specifically to an energy storage and noise reduction structure, design method, and energy storage system. Background Technology

[0002] The noise from energy storage cabinets mainly comes from the energy storage inverters and liquid cooling units. Currently, to reduce the noise generated during the operation of energy storage cabinets, soundproof walls are usually installed around the cabinets. However, soundproof walls are expensive and have a long construction period. Moreover, if mobile energy storage cabinets are deployed as needed, they are temporarily placed in a designated location. If soundproof walls are installed, they need to be removed after use, which is also costly. Alternatively, the air cooling in the energy storage inverters, electrical boxes, and liquid cooling units can be changed to liquid cooling to reduce noise. However, this would increase the manufacturing cost of the energy storage cabinets. There is an urgent need for an energy storage noise reduction structure that can reduce noise from energy storage cabinets at any time without being restricted by the location, and has a short installation period and low cost. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, one of the objectives of this invention is to provide an energy storage noise reduction structure that can reduce noise for energy storage cabinets at any time without being restricted by the site, and has a short installation cycle and low cost.

[0004] The technical solution adopted in this invention is as follows: an energy storage noise reduction structure, including a first partition plate for separating the battery compartment and electrical compartment of the energy storage cabinet, a second partition plate for separating the energy storage inverter and liquid cooling unit, and a cabinet bottom plate, and also including a first cover and a second cover respectively disposed on the front end face and the rear end face of the cabinet, the first cover and the second cover respectively communicating with the interior of the cabinet, the lower end face of the first cover is provided with an air inlet, the second cover is provided with a third partition plate that divides the second cover into an upper cavity and a lower cavity, the opposite end faces of the second cover are respectively provided with a first air outlet and a second air outlet, the first air outlet and the second air outlet are respectively disposed on the upper cavity and the lower cavity, and the inner wall of the first cover and the inner wall of the second cover are both provided with sound-absorbing cotton;

[0005] The first cover, the first partition plate, the second partition plate, and the upper cavity together form a first air duct for noise reduction and heat dissipation. Air enters from the air inlet, passes through the first air duct, and is then discharged from the first air outlet.

[0006] The first cover, the second partition, the cabinet bottom plate, and the lower cavity together form a second air duct for noise reduction and heat dissipation. Air enters from the air inlet, passes through the second air duct, and is then discharged from the second air outlet.

[0007] Explanation: The energy storage cabinet includes a cabinet body and a first and second partition plate located inside the cabinet body. The electrical compartment includes an energy storage inverter and a liquid cooling unit, with the energy storage inverter located above the liquid cooling unit.

[0008] The principle of the technical solution:

[0009] Air enters the first enclosure through the air inlet, passes through the second partition, and then passes through the space enclosed by the first and second partitions to dissipate heat for the energy storage inverter. The space enclosed by the second partition and the bottom plate of the cabinet dissipates heat for the liquid cooling unit. The air then passes through the upper cavity of the second enclosure and is discharged through the first air outlet, and through the lower cavity of the second enclosure and is discharged through the second air outlet.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0011] 1. This invention, by setting a first cover, a second cover, sound-absorbing cotton, and a third partition plate inside the second cover on the front and rear faces of the cabinet respectively, can reduce noise of the energy storage cabinet anytime and anywhere, without being limited by the site, and can also reduce the impact on heat dissipation while reducing noise. The specific analysis is as follows: 1) The air inlet is located on the lower end face of the first cover, that is, the cold air enters from the lower end face of the first cover. Compared with blowing directly vertically into the cabinet, when blowing directly into the cabinet, the high-speed airflow passing through the air inlet is prone to generating whistling noise (turbulence noise and aerodynamic noise). The first cover and the sound-absorbing cotton work together to reduce noise. By extending the gas flow path, the contact area between the sound waves and the sound-absorbing cotton is increased, allowing the high-frequency components in the airflow noise to be preferentially absorbed due to the friction and diffusion effect of the porous structure of the sound-absorbing cotton, thus improving the sound absorption of the cotton. It can prevent the airflow from concentrating in a local area due to the shape or position of the air inlet, while other areas suffer from insufficient heat dissipation. The first enclosure can guide the airflow to diffuse within the enclosure before blowing it into the cabinet, allowing the energy storage inverter and liquid cooling unit to effectively obtain airflow and dissipate heat. It can evenly distribute the airflow, reduce airflow turbulence, and lower noise. It can also act as a louver, preventing rainwater from falling into the cabinet.

[0012] 2) The air discharged from the energy storage inverter and the liquid cooler flows out through the first and second air ducts respectively. First, the hot air discharged from the energy storage inverter and the liquid cooler is separated to prevent the hot air from the liquid cooler from being sucked into the energy storage inverter, thus preventing heat backflow and reducing the impact of hot air crossflow on the heat dissipation efficiency of the energy storage inverter. Then, the hot air passes through the upper and lower chambers respectively, so that the discharged hot air continues to be discharged separately and the exhaust path is increased. At this time, the second enclosure is equipped with sound-absorbing cotton. In addition, the second enclosure is divided into upper and lower chambers, which can make full use of the second enclosure to absorb noise and improve the noise reduction capability. In addition, the first and second air outlets are located on opposite sides of the second enclosure, so that the hot air discharged from the energy storage inverter and the liquid cooler are staggered. Moreover, due to the design of the second enclosure, the distance between them is increased, which can prevent heat backflow, reduce the impact on heat dissipation efficiency, reduce temperature superposition, prevent the formation of local high temperature, and reduce the failure rate of equipment due to local overheating.

[0013] 2. Since the first and second enclosures are installed on the cabinet, they only need to be produced centrally. When noise reduction is required, the first and second enclosures can be directly installed on the cabinet without long-term construction. The installation cycle is short and the cost is low. Moreover, if multiple energy storage cabinets are set up in rows, adjacent cabinets can be placed close together, with only an increase in the space occupied at the front and back of the cabinets. The overall space occupied is small. In addition, the energy storage inverters inside the cabinets will generate electromagnetic radiation. If there are communication base stations or precision instruments operating nearby, it may affect the operation of the communication base stations or precision instruments. The first and second enclosures at the front and back of the cabinets can further improve the electromagnetic shielding performance. By forming a Faraday cage through grounding, electromagnetic radiation is attenuated, avoiding interference with surrounding equipment.

[0014] In a preferred embodiment of the present invention, the upper part of the longitudinal section of the first cover is a right trapezoid.

[0015] Beneficial effects: The upper part of the longitudinal section of the first cover is a right trapezoid, that is, the outer surface of the upper part of the first cover is inclined. This can guide the airflow entering the first cover, so that the air flowing towards the inner wall of the first cover is guided by the inclined part, thus quickly flowing into the cabinet. At the same time, it can also provide enough space inside the first cover to accommodate a large amount of air, so that the air inside the first cover is evenly distributed into the cabinet, ensuring that the corresponding components receive the same amount of airflow, thus improving the overall heat dissipation efficiency.

[0016] In a preferred embodiment of the present invention, the cross-sectional shape of the second cover is an isosceles trapezoid, and the second cover is located between the left and right sides of the cabinet.

[0017] Beneficial effects: The isosceles trapezoidal cross-section increases the noise reduction path, guides hot air flow, and allows hot air to bend, preventing heat backflow and improving heat dissipation efficiency. Furthermore, if multiple cabinets are arranged in rows, adjacent cabinets can have staggered exhaust, reducing mutual interference between exhausts and thus reducing heat dissipation impact. Specifically, the upper cavity increases the hot air flow path and noise propagation path. The upper cavity and its inner wall's sound-absorbing cotton work together to reduce exhaust noise and suppress noise propagation from equipment within the cabinet. The inclined left side (or right side, corresponding to the isosceles trapezoid's waist) of the second enclosure guides the exhaust air, allowing it to flow quickly out of the second enclosure. The second enclosure has a slanted right side (or the right side of the isosceles trapezoid) compared to a vertical arrangement, which reduces the path of exhaust air. If multiple cabinets are arranged in rows, the space between adjacent cabinets can be increased, reducing the impact of hot air from one cabinet on the other. In addition, the first and second air outlets are located on the left and right sides of the second enclosure, respectively, so the exhaust air from adjacent cabinets is staggered, reducing the impact on heat dissipation. Moreover, because the first and second air outlets are located on the left and right sides of the second enclosure, the exhaust air is redirected from a straight direction into the second enclosure to a left (or right) turn, preventing heat backflow and improving heat dissipation efficiency.

[0018] In a preferred embodiment of the present invention, both the first air outlet and the second air outlet are provided with mounting frames. The outer end face of the mounting frame is provided with a plurality of blades arranged at intervals along the height direction of the cabinet. The blades include a vertically arranged first baffle, a second baffle and a third baffle that are both connected to the lower end of the first baffle and are respectively inclined on both sides of the first baffle, and a fourth baffle that is located on the outer side, vertically arranged and connected to the second baffle. The outer end face of the mounting frame is parallel to the outer end face of the connected first cover, and the two mounting frames are located between the left and right sides of the cabinet.

[0019] Beneficial effects: The design of the mounting frame and multiple blades facilitates blade installation. Simply install the blades on the mounting frame, and then directly onto the second enclosure via the mounting frame. It also facilitates rapid airflow. If the blades were directly installed on the second enclosure, a vertically placed mounting plate would be required inside the enclosure. This mounting plate would obstruct airflow and prevent rainwater and dust from entering the second enclosure, thus avoiding the sound-absorbing cotton becoming contaminated with rainwater and dust, which would affect its sound absorption function. Compared to installing the blades directly at the air outlet, the probability of the sound-absorbing cotton near the outlet becoming contaminated with rainwater and dust increases. Because the mounting frame has width, and the blades are mounted on the outer end face of the mounting frame, it effectively prevents the sound-absorbing cotton from becoming contaminated with rainwater and dust, allowing the second enclosure to effectively reduce noise and extending the lifespan of the sound-absorbing cotton.

[0020] In a preferred embodiment of the present invention, the first cover and the second cover are respectively bolted to the cabinet.

[0021] Explanation: The first cover and the second cover correspond to the air inlet panel at the air inlet and the air outlet panel at the air outlet of the cabinet, respectively.

[0022] Beneficial effects: quick disassembly and installation with a short cycle.

[0023] The second objective of this invention is to provide a design method for an energy storage noise reduction structure, used to design the aforementioned energy storage noise reduction structure, comprising the following steps:

[0024] S1: Determine the noise reduction solution, adopting bottom air intake and layered side air outlet;

[0025] S2: Design multiple noise reduction structures based on the noise reduction scheme;

[0026] S3: Using Actran acoustic simulation software, simulate the sound source distribution within the cabinet, establish a noise reduction structure model with sound-absorbing cotton, conduct noise insulation simulation, and obtain the noise level at one meter in front and behind the cabinet. If the obtained noise is less than the preset threshold, the noise reduction design requirements are met. At the same time, using Flotherm software simulation, under the same impedance model conditions, compare the airflow inside the cabinet and the airflow at the outlet of the corresponding noise reduction structure. If the obtained airflow at the outlet is higher than the preset threshold, the heat dissipation requirements are met.

[0027] S4: The heat dissipation performance is evaluated by the causal matrix. The noise reduction structure with the higher weighted score is the final noise reduction structure, as shown in formula (1).

[0028]

[0029] In formula (1), Y is the weighted score of the noise reduction structure, i is the influencing factor, and w i As the corresponding weights of the influencing factors, x i The scores are for each influencing factor of the noise reduction structure.

[0030] S5: The noise reduction structure includes a first cover and a second cover respectively installed on the front and rear faces of the cabinet. The first cover and the second cover are respectively connected to the interior of the cabinet. The lower end face of the first cover is provided with an air inlet. The second cover is provided with a third partition plate that divides the second cover into an upper cavity and a lower cavity. The opposite end faces of the second cover are respectively provided with a first air outlet and a second air outlet. The first air outlet and the second air outlet are respectively installed on the upper cavity and the lower cavity.

[0031] Based on the determined noise reduction structure, a physical noise reduction structure is fabricated and installed on the cabinet.

[0032] S6: The energy storage cabinet operates continuously at maximum output / input power. The noise level at one meter around the cabinet before and after the installation of the physical noise reduction structure is measured. If the difference between the maximum noise before and after the installation of the physical noise reduction structure is greater than the preset threshold, and the difference remains greater than the preset threshold as the energy storage cabinet continues to operate, then the noise reduction structure design is completed through actual verification.

[0033] The third objective of this invention is to provide an energy storage system, including the energy storage and noise reduction structure described above. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the energy storage and noise reduction structure of the present invention;

[0035] Figure 2 This is a partial structural schematic diagram of the energy storage and noise reduction structure of the present invention;

[0036] Figure 3 This is a partial structural schematic diagram of the energy storage and noise reduction structure of the present invention from another angle;

[0037] Figure 4 This is a structural schematic diagram of position A in the present invention;

[0038] Figure 5 This is a partial structural diagram of the energy storage and noise reduction structure of the present invention from another angle;

[0039] Figure 6 This is a schematic diagram of the structure of the first cover of the present invention;

[0040] Figure 7 This is a schematic diagram of the structure of the second cover of the present invention;

[0041] Figure 8 This is a structural schematic diagram of the second cover of the present invention from another angle;

[0042] Figure 9 This is a structural schematic diagram of the second cover of the present invention from another angle;

[0043] Figure 10 This is a schematic diagram of the blade structure of the present invention;

[0044] Figure 11 This is a schematic diagram of the blade of the present invention from another angle. Detailed Implementation

[0045] Typical embodiments embodying the features and advantages of the present invention will be specifically described in the following description. It should be understood that the present invention can have various variations in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations herein are for illustrative purposes only and not intended to limit the present invention.

[0046] In the description of this application, the terms "first," "second," "side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the structure referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0047] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0048] The reference numerals in the attached drawings include: first partition plate 1, second partition plate 2, first cover 3, air inlet 301, second cover 4, third partition plate 401, first air outlet 402, second air outlet 403, mounting frame 404, blade 405, upper cavity 406, lower cavity 407, air guide 5, cabinet 6, energy storage inverter 7, electrical box 8, liquid cooling unit 9, and air outlet plate 10.

[0049] Energy storage and noise reduction structures, such as Figure 3 , 4 As shown, it includes a first partition 1 for separating the battery compartment and electrical compartment of the energy storage cabinet, a second partition 2 for separating the energy storage inverter and liquid cooling unit, and a bottom plate of the cabinet body 6, as shown. Figure 1As shown, the cabinet 6 has a first cover 3 and a second cover 4 respectively installed on the front and rear faces, and a flow guide 5 with both ends connected on the rear face of the energy storage inverter 7. The first cover 3 and the second cover 4 are respectively connected to the interior of the cabinet 6 and are respectively bolted to the cabinet 6.

[0050] like Figure 2 , 5 As shown, the lower end face of the first cover 3 is provided with an air inlet 301, and the upper part of the longitudinal section of the first cover 3 is a right trapezoid.

[0051] In this embodiment, a dustproof net is provided at the air inlet 301.

[0052] like Figure 7 As shown, the second cover 4 is provided with a third partition plate 401 that divides the second cover 4 into an upper cavity 406 and a lower cavity 407. In this embodiment, the third partition plate 401 evenly divides the internal space of the second cover 4, that is, the internal space of the upper cavity 406 and the lower cavity 407 is the same.

[0053] The second cover 4 is provided with a first air outlet 402 and a second air outlet 403 on opposite end faces. The first air outlet 402 and the second air outlet 403 are respectively provided on the upper cavity and the lower cavity. The inner wall of the first cover 3 and the inner wall of the second cover 4 are both provided with sound-absorbing cotton.

[0054] like Figure 9 As shown, the cross-sectional shape of the second cover 4 is an isosceles trapezoid, and the second cover 4 is located between the left and right sides of the cabinet 6.

[0055] like Figure 8-11 As shown, in this embodiment, both the first air outlet 402 and the second air outlet 403 are provided with mounting frames 404. The outer end face of the mounting frame 404 is provided with a plurality of blades 405 arranged at intervals along the height direction of the cabinet 6. The blades 405 include a vertically arranged first baffle, a second baffle and a third baffle that are both connected to the lower end of the first baffle and are respectively inclined on both sides of the first baffle, and a fourth baffle that is located on the outer side, vertically arranged and connected to the second baffle. The outer end face of the mounting frame 404 is parallel to the outer end face of the connected first cover 3, and the two mounting frames are located between the left and right sides of the cabinet 6.

[0056] like Figure 5 As shown, in this embodiment, the electrical box 8 and the energy storage inverter 7 are located between the first partition plate 1 and the second partition plate 2, with the energy storage inverter 7 located above the electrical box 8. The electrical box 8 is equipped with a battery management system.

[0057] In this embodiment, as Figure 4As shown, the first cover 3 and the second cover 4 are directly installed on the outside of the air inlet plate and air outlet plate 10 of the cabinet. It is only necessary to remove the original bolts that were used to install the air outlet plate 10 and the cabinet, and the bolts that were used to install the air inlet plate and the cabinet. Then, one end of the first cover is attached to the air inlet plate and connected to the cabinet with bolts, and one end of the second cover is attached to the air outlet plate and connected to the cabinet with bolts. There is no need to occupy extra space to place the air outlet plate and the air inlet plate.

[0058] In this embodiment, the guide 5 can be a horn-shaped sleeve. The cross-sectional area of ​​the end connected to the energy storage inverter 7 is smaller than the cross-sectional area of ​​the end connected to the upper cavity 406. The end of the guide 5 near the upper cavity 406 is located in front of the rear end of the electrical box 8. The through end of the guide 5 is close to and directly opposite the connection between the upper cavity 406 and the cabinet 6. The air outlet plate 10 abuts against the second partition plate 2. The guide 5 is close to the air outlet plate 10. There is a gap between the guide 5 and the air outlet plate 10. The second partition plate 2 and the air outlet plate 10 cooperate to completely separate the air discharged from the energy storage inverter 7 and the electrical box 8 from the air discharged from the liquid cooling unit 9. The third partition plate 401 is opposite to the contact point between the energy storage inverter 7 and the electrical box 8.

[0059] Since the heat dissipation requirements of the liquid cooling unit 9 are much greater than those of the electrical box 8, the third partition plate 401 evenly divides the internal space of the first cover 3, which can ensure that the heat dissipation space below is large enough to ensure that the liquid cooling unit 9 can effectively dissipate heat.

[0060] In this embodiment, since the second cover 4 is located at the position of the air outlet plate relative to the cabinet 6, in order not to change the structure of the cabinet 6, the connection hole connecting the air outlet plate 10 of the cabinet 6 to the cabinet 6 is directly used. At the same time, the upper cavity 406 and the lower cavity 407 should be guaranteed to have the maximum heat dissipation space as much as possible. Therefore, the third partition plate 401 is opposite to the contact point between the energy storage inverter 7 and the electrical box 8.

[0061] Compared to directly exhausting hot air, adding a second enclosure 4 would affect heat dissipation. However, in this embodiment, one end of the guide 5 is opposite to the upper cavity 406, and the end of the guide 5 near the upper cavity 406 is located in front of the front end of the electrical box 8. This allows the air exhausted from the energy storage inverter 7 to blow directly into the upper cavity 406, preventing the air exhausted from the electrical box 8 from blowing towards the energy storage inverter 7 and causing heat backflow. This improves the heat dissipation efficiency of the energy storage inverter 7. The heat dissipation requirement of the electrical box 8 is less than that of the energy storage inverter 7. Due to the upward flow of hot air, the air exhausted from the electrical box 8 flows into the upper cavity 406 through the gap between the guide 5 and the upper cavity 406.

[0062] The placement of the guide element 5 allows the third partition plate 401 to be positioned on the extension line of the contact point between the energy storage inverter 7 and the electrical box 8. This means that the third partition plate 401 evenly divides the internal space of the first enclosure 3, ensuring that the heat dissipation space of the lower cavity 407 is large enough to reduce the impact on the heat dissipation of the liquid-cooled unit 9. Without the guide element 5, the exhaust plate 10 and the second partition plate 2 would be in contact, while the third partition plate 401 would be opposite the contact point between the energy storage inverter 7 and the electrical box 8. The air exhausted from the electrical box 8 would be guided by the exhaust plate 10 and blown towards the energy storage inverter 7, affecting the heat dissipation of the energy storage inverter 7. In order to reduce the heat dissipation of the energy storage inverter 7, the air exhausted from the energy storage inverter 7 would also accumulate in the space enclosed by the rear end face of the energy storage inverter 7, the rear end face of the electrical box 8, the exhaust plate 10, and the second partition plate 2, affecting heat dissipation. Therefore, the third partition plate 401 would need to be moved down, but this would reduce the heat dissipation space of the lower cavity 407.

[0063] The air guide 5 allows the energy storage inverter 7 to dissipate heat quickly, directing the air directly into the upper cavity 406, reducing the impact of the air discharged from the electrical box 8 on the heat dissipation of the energy storage inverter 7, and allowing the electrical box 8 to dissipate heat normally.

[0064] The first cover 3, the first partition plate 1, the second partition plate 2, and the upper cavity 406 enclose each other to form a first air duct for noise reduction and heat dissipation. Air enters from the air inlet 301, passes through the first air duct, and is then discharged from the first air outlet 402.

[0065] The first cover 3, the second partition plate 2, the bottom plate of the cabinet 6, and the lower cavity 407 enclose each other to form a second air duct for noise reduction and heat dissipation. The air enters from the air inlet 301, passes through the second air duct, and is then discharged from the second air outlet 403.

[0066] The energy storage noise reduction structure design method, used to design the energy storage noise reduction structure mentioned above, includes the following steps:

[0067] S1: Determine the noise reduction solution, adopting bottom air intake and layered side air outlet;

[0068] S2: Design multiple noise reduction structures based on the noise reduction scheme;

[0069] In this embodiment, noise reduction structures with different shapes are designed while satisfying the noise reduction scheme.

[0070] S3: Using Actran acoustic simulation software, simulate the sound source distribution of cabinet 6, establish a noise reduction structure model with sound-absorbing cotton, conduct noise isolation simulation, and obtain the noise level at one meter in front and behind cabinet 6. If the obtained noise is less than the preset threshold, the noise reduction design requirements are met. At the same time, using Flotherm software simulation, under the same impedance model conditions, compare the air flow inside cabinet 6 and the air outlet flow rate of the corresponding noise reduction structure. If the obtained air outlet air volume is higher than the preset threshold, the heat dissipation requirements are met.

[0071] S4: The heat dissipation performance is evaluated by the causal matrix. The noise reduction structure with the higher weighted score is the final noise reduction structure, as shown in formula (1).

[0072]

[0073] In formula (1), Y is the weighted score of the noise reduction structure, i is the influencing factor, and w i As the corresponding weights of the influencing factors, x i The scores are for each influencing factor of the noise reduction structure.

[0074] In this embodiment, Table 1 shows the comparison of heat dissipation performance. The noise reduction structure B has the highest weighted score, indicating that the noise reduction structure B has good heat dissipation performance. In other words, while meeting the noise reduction requirements, it ensures that the noise reduction structure has the least impact on heat dissipation.

[0075]

[0076] Table 1

[0077] S5: The noise reduction structure includes a first cover and a second cover respectively installed on the front and rear faces of the cabinet. The first cover and the second cover are respectively connected to the interior of the cabinet. The lower end face of the first cover is provided with an air inlet. The second cover is provided with a third partition plate that divides the second cover into an upper cavity and a lower cavity. The opposite end faces of the second cover are respectively provided with a first air outlet and a second air outlet. The first air outlet and the second air outlet are respectively installed on the upper cavity and the lower cavity.

[0078] Based on the determined noise reduction structure, a physical noise reduction structure is fabricated and installed on cabinet 6.

[0079] S6: The energy storage cabinet operates continuously at maximum output / input power. The noise level at one meter around the cabinet 6 before and after the installation of the physical noise reduction structure is measured. If the difference between the maximum noise before and after the installation of the physical noise reduction structure is greater than the preset threshold, and the difference remains greater than the preset threshold as the energy storage cabinet continues to operate, then the noise reduction structure design is completed through actual verification.

[0080] The energy storage system, including the energy storage noise reduction structure and the active noise reduction subsystem mentioned above, can reduce the noise of the cabinet exhaust by means of the energy storage noise reduction structure, or reduce the noise of the cabinet exhaust by means of the combination of the energy storage noise reduction structure and the active noise reduction subsystem, according to the requirements of environmental noise standards.

[0081] The active noise cancellation subsystem includes a control module, a microphone array group installed on the second cover 4 and located at the connection between the second cover 4 and the cabinet 6, and two sets of distributed speaker groups respectively installed inside the second cover 4 and near the first air outlet 402 and the second air outlet 403. The control module is used to receive the noise decibel information transmitted by the microphone array group and to control the distributed speaker group to output the reverse sound wave signal.

[0082] The microphone array group includes a first microphone array arranged in rows and columns on the second cover 4 and located at the connection between the upper cavity 406 and the cabinet 6, and a second microphone array arranged in rows and columns on the second cover 4 and located at the connection between the lower cavity 407 and the cabinet 6.

[0083] Both the first microphone array and the second microphone array include four microphones arranged in two rows and two columns. In the first microphone array, the four microphones are located at the four corners where the upper cavity 406 connects to the cabinet 6, and in the second microphone array, the four microphones are located at the four corners where the lower cavity 407 connects to the cabinet 6.

[0084] The distributed loudspeaker group includes two loudspeakers. The two loudspeakers located in the upper cavity 406 are respectively located near the upper end of the first air outlet 402 and near the lower end of the first air outlet 402. The two loudspeakers located in the lower cavity 407 are respectively located near the upper end of the second air outlet 403 and near the lower end of the second air outlet 403.

[0085] When environmental noise standards are lenient, such as when the energy storage system is deployed in an industrial area (that is, when it is used for mid-to-high frequency noise reduction), or when the environmental noise standard is between 55-70 dB(A), the energy storage noise reduction structure reduces noise. The air enters from the air inlet 301 of the first cover 3 on the front face of the cabinet 6, enters the interior of the cabinet 6, and then exits through the upper cavity 406, the first air outlet 402, the lower cavity 407, and the second air outlet 403 of the second cover 4 respectively.

[0086] When environmental noise standards are strict, such as when the energy storage system is deployed in a residential area (i.e., for low-frequency noise reduction), or when the environmental noise standard is less than or equal to 55 dB(A), the active noise reduction subsystem and the energy storage noise reduction structure work together to reduce noise. The air enters from the air inlet 301 of the first cover 3 on the front face of the cabinet 6, enters the interior of the cabinet 6, and then exits through the upper cavity 406, the first air outlet 402, the lower cavity 407, and the second air outlet 403 of the second cover 4. At the same time, the microphone array group collects the environmental noise in real time, calculates the noise decibel, and transmits the calculated noise decibel to the control module. When the noise decibel value received by the control module is greater than the preset threshold, the control module generates a reverse sound wave signal and outputs the reverse sound wave signal through the distributed speaker group.

[0087] Specifically, when the energy storage system is deployed in a residential area, the first microphone array and the second microphone array collect environmental noise in real time, calculate the corresponding noise decibels, and transmit the calculated noise decibels to the control module respectively;

[0088] When the control module receives a noise decibel value from the first microphone array that is greater than a preset threshold, the control module generates an inverse sound wave signal with the opposite phase and equal amplitude to the noise through an adaptive filtering algorithm, and outputs the inverse sound wave signal through a distributed speaker group near the first air outlet 402.

[0089] When the control module receives a noise decibel value from the second microphone array that is greater than a preset threshold, the control module generates an inverse sound wave signal with the opposite phase and equal amplitude to the noise through an adaptive filtering algorithm, and outputs the inverse sound wave signal through a distributed speaker group near the second air outlet 403.

[0090] In this embodiment, the threshold is determined by measuring the noise reduction effect after installing the energy storage noise reduction structure during operation, and then determining the threshold of the active noise reduction subsystem according to the environmental noise requirements. That is, the threshold set in the control module is the sum of the noise reduction amount of the energy storage noise reduction structure and the minimum noise required by the environment. For example, the noise reduction amount of the energy storage noise reduction structure is 10 dBA, and the environmental requirement is that the noise at one meter outside the cabinet is 60 dBA. When the control module receives the noise decibel value of the microphone array which is greater than the preset threshold of 70 dBA, the control module automatically generates a reverse sound wave signal and outputs the reverse sound wave signal through the distributed speaker group to perform active noise reduction.

[0091] In this embodiment, the first microphone array and the second microphone array are located at the connection between the upper cavity and the cabinet and the lower cavity and the cabinet, respectively. The first microphone array and the second microphone array work together to achieve comprehensive monitoring of noise generated at the exhaust vent inside the cabinet. Specifically, the first microphone array is located at the connection between the upper cavity and the cabinet, which is the point where the air intake of the upper cavity is the largest. It can collect the decibel level of the exhaust noise passing through the upper cavity in real time and accurately obtain the maximum decibel level of the noise. The second microphone array is located at the connection between the lower cavity and the cabinet, which is the point where the air intake of the lower cavity is the largest. It can collect the decibel level of the exhaust noise passing through the lower cavity in real time and accurately obtain the maximum decibel level of the noise. This allows the control module to receive and process the noise signal in real time, control the distributed speaker group to respond in real time, reduce noise in real time, and improve response efficiency.

[0092] In this embodiment, the energy storage noise reduction structure and the active noise reduction subsystem work together to reduce the noise generated by the energy storage cabinet according to the environmental noise standard, so that the energy storage cabinet can be used in different scenarios. For example, when the energy storage cabinet needs to be deployed in a residential area, the present invention can reduce the noise decibel to the required range through the energy storage noise reduction structure and the active noise reduction subsystem to meet the noise standard of the residential area. When the energy storage cabinet needs to be deployed in an industrial area, the noise reduction requirement is lower than when the energy storage cabinet is deployed in a residential area, and noise reduction can be achieved solely through the energy storage noise reduction structure.

[0093] The energy storage and noise reduction structure and active noise reduction subsystem are integrated into the cabinet, requiring no additional equipment and thus saving space. Moreover, each cabinet is equipped with a corresponding energy storage and noise reduction structure and active noise reduction subsystem, shortening the distance and enabling instant noise reduction with a fast response speed.

[0094] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. An energy storage noise reduction structure, comprising a first partition plate for separating the battery compartment and the electrical compartment of the energy storage cabinet, a second partition plate for separating the energy storage inverter and the liquid cooling unit, and a cabinet bottom plate, characterized in that: It also includes a first cover and a second cover respectively set on the front and rear faces of the cabinet, and a flow guide that runs through both ends on the rear face of the energy storage inverter. The upper part of the longitudinal section of the first cover is a right trapezoid, and the cross-sectional shape of the second cover is an isosceles trapezoid. The second cover is located between the left and right sides of the cabinet. The first cover and the second cover are respectively connected to the interior of the cabinet. The lower end face of the first cover is provided with an air inlet. The second cover is provided with a third partition plate that divides the second cover into an upper cavity and a lower cavity. The third partition plate evenly divides the internal space of the second cover. The second cover has a first air outlet and a second air outlet on opposite sides, respectively. The first air outlet and the second air outlet are respectively located on the upper cavity and the lower cavity. The inner walls of the first cover and the second cover are both provided with sound-absorbing cotton. The first and second covers are installed on the outside of the air inlet and air outlet plates of the cabinet. The end of the guide near the upper cavity is located in front of the rear end of the electrical box. The end of the guide that passes through is close to and directly faces the connection between the upper cavity and the cabinet. The air outlet plate abuts against the second partition plate. The guide is close to the air outlet plate. There is a gap between the guide and the air outlet plate. The third partition plate is opposite to the contact point between the energy storage inverter and the electrical box. The first cover, the first partition plate, the second partition plate, and the upper cavity together form a first air duct for noise reduction and heat dissipation. Air enters from the air inlet, passes through the first air duct, and is then discharged from the first air outlet. The first cover, the second partition, the cabinet bottom plate, and the lower cavity together form a second air duct for noise reduction and heat dissipation. Air enters from the air inlet, passes through the second air duct, and is then discharged from the second air outlet.

2. The energy storage and noise reduction structure according to claim 1, characterized in that: Both the first and second air outlets are equipped with mounting frames. The outer end face of the mounting frame is provided with multiple blades spaced apart along the height direction of the cabinet. Each blade includes a vertically arranged first baffle, a second baffle and a third baffle that are connected to the lower end of the first baffle and are respectively inclined on both sides of the first baffle, and a fourth baffle that is located on the outer side, vertically arranged and connected to the second baffle. The outer end face of the mounting frame is parallel to the outer end face of the connected first cover, and the two mounting frames are located between the left and right sides of the cabinet.

3. The energy storage and noise reduction structure according to claim 1, characterized in that: The first cover and the second cover are respectively bolted to the cabinet.

4. A method for designing an energy storage and noise reduction structure, characterized in that: The design of the energy storage noise reduction structure according to any one of claims 1-3 includes the following steps: S1: Determine the noise reduction solution, adopting bottom air intake and layered side air outlet; S2: Design multiple noise reduction structures based on the noise reduction scheme; S3: Using Actran acoustic simulation software, simulate the sound source distribution within the cabinet, establish a noise reduction structure model with sound-absorbing cotton, conduct noise insulation simulation, and obtain the noise level at one meter in front and behind the cabinet. If the obtained noise is less than the preset threshold, the noise reduction design requirements are met. At the same time, using Flotherm software simulation, under the same impedance model conditions, compare the airflow inside the cabinet and the airflow at the outlet of the corresponding noise reduction structure. If the obtained airflow at the outlet is higher than the preset threshold, the heat dissipation requirements are met. S4: The heat dissipation performance is evaluated by the causal matrix. The structure with the higher weighted score for noise reduction is the final noise reduction structure, as shown in formula (1). （1）， In formula (1), Y is the weighted score of the noise reduction structure, i is the influencing factor, and w i As the corresponding weights of the influencing factors, x i The scores are for each influencing factor of the noise reduction structure. S5: The noise reduction structure includes a first cover and a second cover respectively installed on the front and rear faces of the cabinet. The first cover and the second cover are respectively connected to the interior of the cabinet. The lower end face of the first cover is provided with an air inlet. The second cover is provided with a third partition plate that divides the second cover into an upper cavity and a lower cavity. The opposite end faces of the second cover are respectively provided with a first air outlet and a second air outlet. The first air outlet and the second air outlet are respectively installed on the upper cavity and the lower cavity. Based on the determined noise reduction structure, a physical noise reduction structure is fabricated and installed on the cabinet. S6: The energy storage cabinet operates continuously at maximum output / input power. The noise level at one meter around the cabinet before and after the installation of the physical noise reduction structure is measured. If the difference between the maximum noise before and after the installation of the physical noise reduction structure is greater than the preset threshold, and the difference remains greater than the preset threshold as the energy storage cabinet continues to operate, then the noise reduction structure design is completed through actual verification.

5. An energy storage system, characterized in that: Includes the energy storage and noise reduction structure as described in any one of claims 1-3.

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