Active and passive combined energy storage noise reduction system, noise reduction method and energy storage system

Abstract

The invention relates to the technical field of energy storage and noise reduction, and discloses an active and passive combined energy storage and noise reduction system which comprises a passive noise reduction subsystem and an active noise reduction subsystem which are arranged on a cabinet body, the passive noise reduction subsystem is used for prolonging an exhaust path of air at an air outlet in the cabinet body and reducing noise of the air at the air outlet, and the active noise reduction subsystem is used for reducing noise of the air at the air outlet. The active noise reduction subsystem is used for actively outputting a reverse sound wave signal for active noise reduction; according to the standard requirements of environmental noise, the exhaust noise of the cabinet body can be reduced through the passive noise reduction subsystem, or the exhaust noise of the cabinet body can be reduced through the combination of the passive noise reduction subsystem and the active noise reduction subsystem. According to the invention, passive and active combined noise reduction or passive noise reduction can be carried out on the energy storage cabinet according to the environmental noise standard, so that the energy storage cabinet can be allowed to be used in different scenes, the occupied space is saved, and the response speed is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage noise reduction, in particular to an active and passive combined energy storage noise reduction system, a noise reduction method and an energy storage system. BACKGROUND

[0002] The energy storage system refers to a device or a collection of technologies that stores energy (such as chemical energy) through specific technologies and releases it for use when needed. The energy storage cabinet is a specific implementation form of the energy storage system.

[0003] The noise of the energy storage cabinet mainly comes from the energy storage inverter and the liquid cooling unit. Currently, in order to reduce the noise generated during the operation of the energy storage cabinet, a soundproof wall is usually installed around the energy storage cabinet. However, the cost of the soundproof wall is high and the construction period is long. Moreover, if a movable energy storage cabinet is required according to the demand, the energy storage cabinet is temporarily placed at a designated location. If a soundproof wall is installed, it needs to be removed after use, which is costly. Alternatively, the air cooling heat dissipation in the energy storage inverter, electrical box and liquid cooling unit can be adjusted to liquid cooling heat dissipation to achieve noise reduction. However, this will increase the manufacturing cost of the energy storage cabinet. Moreover, the noise standard in residential areas is more stringent than that in industrial areas. Therefore, the current energy storage cabinet needs to be equipped with additional noise reduction equipment for active noise reduction (further enhancing the noise reduction effect) if it is placed in an environment with strict noise standards (such as residential areas). The noise reduction equipment is located outside the energy storage cabinet, which increases the occupied space and slows down the response speed. Therefore, there is an urgent need for an energy storage noise reduction system that can passively and actively combine noise reduction, or passively reduce noise, can be used in different scenarios, saves space, has fast response speed, and can be used for noise reduction of the energy storage cabinet at any time without site restrictions, has a short installation period and low cost. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, one of the purposes of the present application is to provide an active and passive combined energy storage noise reduction system, which can passively and actively combine noise reduction or passively reduce noise according to the environmental noise standard, allowing the energy storage cabinet to be used in different scenarios, saving space and having fast response speed.

[0005] The technical scheme adopted by the present application is as follows: an active and passive combined energy storage noise reduction system, comprising a passive noise reduction subsystem and an active noise reduction subsystem arranged on the cabinet body. The passive noise reduction subsystem is used to prolong the discharge path of the air at the air outlet in the cabinet body and reduce the noise of the air at the air outlet. The active noise reduction subsystem is used to actively output reverse sound wave signals for active noise reduction. According to the environmental noise standard, the exhaust noise of the cabinet can be reduced by the passive noise reduction subsystem, or the exhaust noise of the cabinet can be reduced by the combination of the passive noise reduction subsystem and the active noise reduction subsystem.

[0006] Compared with the prior art, the present application has the following advantages: The passive noise reduction subsystem and the active noise reduction subsystem cooperate to reduce the noise generated by the energy storage cabinet according to the environmental noise standard, so that the energy storage cabinet can be allowed to be used in different scenes, for example, when the energy storage cabinet needs to be arranged in a residential area, the passive noise reduction subsystem and the active noise reduction subsystem can reduce the noise decibels to the required range to meet the noise standard of the residential area, and when the energy storage cabinet needs to be arranged in an industrial area, the noise reduction demand is lower than that when the energy storage cabinet is arranged in the residential area, and the passive noise reduction subsystem can be used for noise reduction. The passive noise reduction subsystem and the active noise reduction subsystem are self-provided for the cabinet body, so that no additional space is occupied, the occupied space is saved, and each cabinet body is provided with the corresponding passive noise reduction subsystem and active noise reduction subsystem, the distance is shortened, the noise can be reduced immediately, and the response speed is fast.

[0007] As a preferred embodiment of the present application, the passive noise reduction subsystem comprises a second cover body arranged at the rear end face of the cabinet body, the second cover body is in communication with the inside of the cabinet body, a third partition plate is arranged in the second cover body to divide the second cover body into an upper cavity and a lower cavity, opposite end faces of the second cover body are respectively provided with a first air outlet and a second air outlet, the first air outlet and the second air outlet are arranged on the upper cavity and the lower cavity respectively, and sound-absorbing cotton is arranged on the inner wall of the second cover body. The active noise reduction subsystem comprises a control module, a microphone array group arranged on the second cover body and located at the communication position between the second cover body and the inside of the cabinet body, and two distributed speaker groups arranged on the second cover body and close to the first air outlet and the second air outlet respectively, the control module is used for receiving noise decibel information transmitted by the microphone array group, and is also used for controlling the distributed speaker groups to output reverse sound wave signals. When the environmental noise standard is loose, the passive noise reduction subsystem reduces the noise, the air enters from the air inlet at the front end of the cabinet body, enters the inside of the cabinet body, and is discharged through the upper cavity of the second cover body, the first air outlet, the lower cavity and the second air outlet respectively, the air is discharged through the second cover body to prolong the discharge path, and the sound-absorbing cotton reduces the noise. When the environmental noise standard is strict, the active noise reduction subsystem and the passive noise reduction subsystem cooperate to reduce the noise, the air enters from the air inlet at the front end of the cabinet body, enters the inside of the cabinet body, and is discharged through the upper cavity of the second cover body, the first air outlet, the lower cavity and the second air outlet respectively, the air is discharged through the second cover body to prolong the discharge path, and the sound-absorbing cotton reduces the noise, at the same time, the microphone array group collects the environmental noise in real time, calculates the noise decibels, and transmits the calculated noise decibels to the control module, when the noise decibel value received by the control module is greater than a preset threshold value, the control module generates a reverse sound wave signal, and the distributed speaker groups output the reverse sound wave signal.

[0008] Explanation: The energy storage cabinet comprises a cabinet body and an energy storage inverter and a liquid cooling unit arranged in the cabinet body.

[0009] Beneficial effects: the second cover and sound-absorbing cotton are arranged on the rear end face of the cabinet body, so that the energy storage cabinet can be noise-reduced at any time and any place without site limitation, and the installation period is short and the cost is low, and specific analysis is as follows: 1) the third partition plate on the second cover divides the hot air discharged from the inside of the energy storage cabinet, increases the path of the hot air discharge, and the second cover and the sound-absorbing cotton arranged in the second cover are divided, so that the hot air fully contacts the sound-absorbing cotton, fully utilizes the second cover to absorb noise, and improves the noise reduction capacity; 2) the first air outlet and the second air outlet on the second cover are located on opposite sides of the second cover, so that the hot air discharged by the previous division is discharged staggered, and because the second cover itself has a width, the distance between the staggered hot air is increased, the hot air backflow is prevented, the influence on the heat dissipation efficiency is reduced, the temperature superposition is reduced, the local high temperature is prevented, and the failure rate of the equipment caused by local overheating is reduced; 3) the second cover is installed on the cabinet body, only needs to be produced in batches, when noise reduction is needed, the second cover is directly installed on the cabinet body, only the space occupied by the cabinet body before and after is increased, the total space occupied is small, and the energy storage inverter in the cabinet body generates electromagnetic radiation, if there are communication base stations or precision instruments around, the communication base stations or precision instruments are easy to be affected, the second cover behind the cabinet body can further improve the electromagnetic shielding performance, forms a Faraday cage through grounding, attenuates electromagnetic radiation, and avoids interference with surrounding equipment. The microphone array group is located at the second cover and the internal communication place of the cabinet, because the second cover and the internal communication place of the cabinet are the places with the largest air volume, the noise decibel collected by the microphone array group is more accurate, and the noise decibel at the place with the largest flow rate and flow volume can be collected in real time, so that the response speed of the active noise reduction subsystem is further improved.

[0010] As a preferred embodiment of the present application, the microphone array group includes a first microphone array arranged in rows and columns on the second cover and located at the upper cavity and the internal communication place of the cabinet, and a second microphone array arranged in rows and columns on the second cover and located at the lower cavity and the internal communication place of the cabinet. When the active noise reduction subsystem is started, the first microphone array and the second microphone array collect environmental noise in real time, calculate the corresponding noise decibel respectively, and transmit the calculated noise decibel to the control module respectively. When the control module receives the noise decibel value of the first microphone array greater than the preset threshold value, the control module generates an inverted sound wave signal opposite in phase and equal in amplitude to the noise through an adaptive filtering algorithm, and outputs the inverted sound wave signal through the distributed loudspeaker group close to the first air outlet. When the control module receives the noise decibel value of the second microphone array greater than the preset threshold value, the control module generates an inverted sound wave signal opposite in phase and equal in amplitude to the noise through an adaptive filtering algorithm, and outputs the inverted sound wave signal through the distributed loudspeaker group close to the second air outlet.

[0011] Beneficial effects: the first microphone array and the second microphone array are respectively located at the upper cavity and the cabinet communication place, the lower cavity and the cabinet communication place, and the first microphone array and the second microphone array cooperate to realize comprehensive monitoring of the noise generated at the exhaust place of the cabinet, specifically, the first microphone array is located at the upper cavity and the cabinet communication place, that is, the maximum air inlet place of the upper cavity, which can collect the exhaust noise decibel of the upper cavity in the first time, accurately obtain the maximum noise decibel, and the second microphone array is located at the lower cavity and the cabinet communication place, that is, the maximum air inlet place of the lower cavity, which can collect the exhaust noise decibel of the lower cavity in the first time, accurately obtain the maximum noise decibel, so that the control module receives and processes the noise signal in time, and controls the distributed loudspeaker group to respond in time, reduces noise in time, and improves response efficiency. According to the noise conditions collected by the first microphone array and the second microphone array, the control module takes different control measures, when the noise decibel value of the first microphone array exceeds the standard, the distributed loudspeaker group close to the first air outlet outputs the reverse sound wave signal, when the noise decibel value of the second microphone array exceeds the standard, the distributed loudspeaker group close to the second air outlet outputs the reverse sound wave signal, and this partition control mode can more accurately eliminate the noise in different areas, improve the noise elimination effect, and reduce the interference on the normal life and rest of residents.

[0012] As a preferred embodiment of the application, the first microphone array and the second microphone array each include four microphones arranged in two rows and two columns, and the four microphones in the first microphone array are respectively located at four corners of the upper cavity and the cabinet communication place, and the four microphones in the second microphone array are respectively located at four corners of the lower cavity and the cabinet communication place.

[0013] Beneficial effects: the four microphones are arranged in two rows and two columns at four corners of the cavity and the cabinet communication place, which can cover a larger space area, compared with single microphone or a small number of microphone arrangement, the application can more comprehensively capture noise signals from different directions and positions, reduce the monitoring blind area, and ensure omnidirectional monitoring of the noise generated by the upper and lower cavities; Multiple microphones simultaneously collect noise signals, which is equivalent to increasing the signal collection channel, in the noise propagation process, the signal may be attenuated or distorted due to various factors, through the cooperative work of multiple microphones, the collected signals can be comprehensively processed, such as averaging, so as to enhance the strength of the effective signal and improve the stability of the signal, so that the monitoring result is more accurate and reliable; Arranging the microphones at the four corners of the cavity and the cabinet communication place does not require complex mechanical structures and additional installation space, only needs to fix the microphones at the corresponding corner positions, reduces the installation difficulty and workload.

[0014] As a preferred embodiment of the present application, the distributed loudspeaker group comprises two loudspeakers, the two loudspeakers in the upper cavity are respectively located near the upper end of the first air outlet and the lower end of the first air outlet, and the two loudspeakers in the lower cavity are respectively located near the upper end of the second air outlet and the lower end of the second air outlet.

[0015] Beneficial effects: The loudspeakers are arranged near the upper and lower ends of the air outlet, which can make the generated reverse sound waves directly act on the noise sound waves propagating from the air outlet, and the reverse sound waves can more quickly and accurately meet and interfere with the original noise sound waves, thereby more effectively canceling the noise and improving the efficiency of noise elimination. The two loudspeakers are respectively located at the upper and lower ends of the air outlet, forming a three-dimensional layout method, which can make the reverse sound waves more uniformly propagate in the space around the air outlet and cover a larger area, compared with a single loudspeaker or a centrally arranged loudspeaker group, which can avoid the situation of uneven sound field coverage, and ensure that the noise level can be effectively reduced in the entire space near the air outlet. Compared with installing loudspeakers on the key air flow path, the loudspeakers are arranged near the air outlet, which does not change the air flow direction and does not increase the resistance of the air flow during the discharge process, and does not hinder the cooling air flow.

[0016] As a preferred embodiment of the present application, the passive noise reduction subsystem further comprises a first cover body arranged on the front end face of the cabinet body, the first cover body is in communication with the interior of the cabinet body, the lower end face of the first cover body is provided with an air inlet, and the inner wall of the first cover body is provided with sound-absorbing cotton; the air enters from the air inlet, enters the cabinet body, and is discharged from the first air outlet and the second air outlet respectively; the air extends the air inlet path through the first cover body and reduces noise through the sound-absorbing cotton; and the air extends the air outlet path through the second cover body and reduces noise through the sound-absorbing cotton.

[0017] Beneficial effects: due to the installation of the second cover, the hot air in the cabinet is no longer directly discharged, and the heat dissipation efficiency of the cabinet is affected. The present application can reduce the influence on the heat dissipation efficiency by arranging the first air outlet and the second air outlet on both sides of the second cover. The present application can further reduce the influence on the heat dissipation efficiency by arranging the first cover. Specifically, 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 directly blowing vertically into the cabinet, the high-speed airflow passing through the air inlet is prone to produce a whistling sound (turbulent flow noise and aerodynamic noise). The first cover cooperates with the sound-absorbing cotton to prolong the gas flow path and increase the contact area between the sound wave and the sound-absorbing cotton, so that the high-frequency component in the airflow noise is preferentially absorbed due to the friction and diffusion effect of the porous structure of the sound-absorbing cotton, improving the noise absorption of the sound-absorbing cotton. It can prevent airflow from concentrating in a local area and other areas from being insufficiently cooled. The first cover can guide the airflow to diffuse in the cover first, and then blow into the cabinet, so that the energy storage inverter and the liquid cooling unit in the cabinet can effectively obtain air volume, improve the heat dissipation efficiency, and evenly distribute the airflow, reduce airflow turbulence, and reduce noise. It can also be equivalent to a louver, which can prevent rainwater from falling into the cabinet.

[0018] As a preferred embodiment of the present application, the passive noise reduction subsystem further comprises a first partition plate for separating the energy storage cabinet battery compartment and the electrical compartment, a second partition plate for separating the energy storage inverter and the liquid cooling unit, and a cabinet bottom plate; The first cover, the first partition plate, the second partition plate, and the upper cavity form a first air duct for noise reduction and heat dissipation. The air enters from the air inlet, passes through the first air duct, and is discharged from the first air outlet. The first cover, the second partition plate, the cabinet bottom plate, and the lower cavity form a second air duct for noise reduction and heat dissipation. The air enters from the air inlet, passes through the second air duct, and is discharged from the second air outlet.

[0019] In this scheme, the air enters the first cover through the air inlet, passes through the second partition plate, and is discharged from the first air outlet through the second cover upper cavity and the first air outlet, and is discharged from the second air outlet through the second cover lower cavity and the second air outlet.

[0020] Beneficial effects: The cooperation of the first cover body, the first partition plate, the second partition plate, the upper cavity can make the wind entering the cabinet flow directionally, and the directional flow is respectively for the heat dissipation of the components in the first air duct and the second air duct, thereby improving the heat dissipation efficiency, making the wind evenly flow to the first air duct and the second air duct from the beginning of entering the cabinet, and then directionally flowing to the upper cavity through the enclosed first air duct and directionally flowing to the lower cavity through the enclosed second air duct, so that the hot air flows directionally, the discharged air flows directionally to prevent cross-flow and backflow, thereby improving the heat dissipation efficiency while reducing noise, thereby offsetting the influence of the second cover body installation on the cabinet heat dissipation efficiency and further improving the heat dissipation efficiency.

[0021] As a preferred embodiment of the present application, the second cover body is in the shape of an isosceles trapezoid in cross section, and the second cover body is located between the left and right sides of the cabinet.

[0022] Beneficial effects: The cross section is in the shape of an isosceles trapezoid, which can increase the noise reduction path, guide the hot air, make the hot air turn, prevent hot backflow, improve the heat dissipation efficiency, and if multiple cabinets are arranged in rows, the adjacent cabinets can be staggered to reduce the influence of the exhaust air of the adjacent cabinets on each other, that is, to reduce the influence of heat dissipation. The specific analysis is as follows: the upper cavity increases the hot air flow path and the noise propagation path, and at this time, the sound-absorbing cotton in the upper cavity and the inner wall of the upper cavity cooperates to reduce the noise of the discharged air and suppress the propagation of the equipment noise in the cabinet. The left side (or the right side, that is, the corresponding side of the waist of the isosceles trapezoid) of the second cover body is inclined to guide the discharged air and make the air flow out of the second cover body quickly. The right side (or the right side, that is, the corresponding side of the waist of the isosceles trapezoid) of the second cover body is inclined, which can reduce the path of the air exhaust compared with the vertical arrangement. If multiple cabinets are arranged in rows, the space between the adjacent cabinets can be increased to reduce the influence of the exhaust air of the cabinets on the adjacent cabinets. In addition, the first air outlet and the second air outlet are respectively located on the left and right sides of the second cover body, and the exhaust air of the adjacent cabinets is also staggered, thereby reducing the influence of heat dissipation. Moreover, because the first air outlet and the second air outlet are respectively arranged on the left and right sides of the second cover body, the discharged air is straightly blown into the second cover body and is adjusted to turn left (or right), thereby preventing hot backflow and improving heat dissipation efficiency.

[0023] The second purpose of the present application is to provide a passive energy storage noise reduction method combined with an active energy storage noise reduction method, which is applied to the passive energy storage noise reduction system combined with an active energy storage noise reduction method described above, and further includes the following steps: S1: When the environmental noise standard is loose, the air enters the first cover body through the air inlet, and the first cover body and the sound-absorbing cotton in the first cover body cooperate to reduce the noise, and the discharged air passes through the upper cavity and the lower cavity in the second cover body. The upper cavity and the sound-absorbing cotton in the upper cavity cooperate, and the lower cavity and the sound-absorbing cotton in the lower cavity cooperate to reduce the noise. The passive noise reduction subsystem automatically reduces the noise for the energy storage system. S2: when the environment noise standard is strict, the active noise reduction subsystem is started to reduce noise for the energy storage system, the microphone array group collects the environment 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 value, the control module generates a reverse sound wave signal, and outputs the reverse sound wave signal through the distributed loudspeaker group, the wind enters the first cover body through the air inlet, and the first cover body and the sound absorbing cotton in the first cover body cooperate to reduce noise, the discharged wind passes through the upper cavity and the lower cavity in the second cover body, and the sound absorbing cotton in the upper cavity and the lower cavity in the upper cavity and the sound absorbing cotton in the lower cavity cooperate to reduce noise, and the active noise reduction subsystem and the passive noise reduction subsystem cooperate to reduce noise for the energy storage system.

[0024] The third object of the present application is to provide an energy storage system comprising the active and passive combined energy storage noise reduction system described above. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a schematic view of the structure of the passive noise reduction subsystem in the active and passive combined energy storage noise reduction system of the present application; Figure 2 is a schematic view of a part of the structure of the passive noise reduction subsystem in the active and passive combined energy storage noise reduction system of the present application; Figure 3 is a schematic view of another part of the structure of the passive noise reduction subsystem in the active and passive combined energy storage noise reduction system of the present application; Figure 4 is a schematic view of the structure at position A of the passive noise reduction subsystem in the active and passive combined energy storage noise reduction system of the present application; Figure 5 is a schematic view of another part of the structure of the passive noise reduction subsystem in the active and passive combined energy storage noise reduction system of the present application; Figure 6 is a schematic view of the structure of the first cover body in the passive noise reduction subsystem in the active and passive combined energy storage noise reduction system of the present application; Figure 7 is a schematic view of the structure of the second cover body in the passive noise reduction subsystem in the active and passive combined energy storage noise reduction system of the present application; Figure 8 is a schematic view of another angle of the structure of the second cover body in the passive noise reduction subsystem in the active and passive combined energy storage noise reduction system of the present application; Figure 9 is a schematic view of another angle of the structure of the second cover body in the passive noise reduction subsystem in the active and passive combined energy storage noise reduction system of the present application; Figure 10 is a schematic view of the structure of the blade in the passive noise reduction subsystem in the active and passive combined energy storage noise reduction system of the present application; Figure 11It is another angle structure diagram of the blade in the passive noise reduction sub-system of the active and passive combined energy storage noise reduction system. DETAILED DESCRIPTION

[0026] The typical embodiments embodying the features and advantages of the present application will be described in detail in the following description. It should be understood that the present application can be varied in a wide range of embodiments, none of which depart from the scope of the present application, and the description and drawings are intended to be illustrative in nature, not restrictive.

[0027] In the description of the present application, the terms "first", "second", "one side" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the structure referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0028] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0029] The reference signs include: a first partition plate 1, a second partition plate 2, a first cover body 3, an air inlet 301, a second cover body 4, a third partition plate 401, a first air outlet 402, a second air outlet 403, a mounting frame 404, a blade 405, an upper cavity 406, a lower cavity 407, a flow guide 5, a cabinet 6, an energy storage inverter 7, an electrical box 8, a liquid cooling unit 9, and an air outlet plate 10.

[0030] The active and passive combined energy storage noise reduction system includes a passive noise reduction sub-system and an active noise reduction sub-system arranged on the cabinet. The passive noise reduction sub-system is used to prolong the discharge path of the air at the air outlet in the cabinet and reduce the noise of the air at the air outlet. The active noise reduction sub-system is used to actively output reverse sound wave signals for active noise reduction. According to the environmental noise standard requirements, the cabinet exhaust noise can be reduced by the passive noise reduction sub-system, or the cabinet exhaust noise can be reduced by the combination of the passive noise reduction sub-system and the active noise reduction sub-system.

[0031] The passive noise reduction sub-system includes a first partition plate 1 for separating the battery compartment of the energy storage cabinet and the electrical compartment, a second partition plate 2 for separating the energy storage inverter and the liquid cooling unit, a cabinet 6 bottom plate, as shown in Figure 1 The first cover body 3 and the second cover body 4 are respectively provided on the front end face and the rear end face of the cabinet 6, and the flow guide 5 is provided on the rear end face of the energy storage inverter 7. The first cover body 3 and the second cover body 4 are respectively communicated with the inside of the cabinet 6, and the first cover body 3 and the second cover body 4 are respectively bolted to the cabinet 6.

[0032] As shown in Figure 2 , 5As shown, the lower end surface of the first cover body 3 is provided with an air inlet 301, and the upper end of the longitudinal section of the first cover body 3 is in the shape of a right-angled trapezoid.

[0033] In this embodiment, a dust screen is arranged at the air inlet 301. The upper end of the longitudinal section of the first cover body 3 is in the shape of a right-angled trapezoid, that is, the outer surface of the upper end of the first cover body 3 is arranged to be inclined, which can guide the air entering the first cover body 3 and make the air flowing to the inner wall of the first cover body 3 be guided through the inclined part, so as to quickly flow to the inside of the cabinet body 6, and at the same time, there is a large enough space in the first cover body 3 to accommodate a large amount of air, so that the air in the first cover body 3 is evenly distributed to the cabinet body 6, so that the corresponding components are subjected to consistent air volume, and the overall heat dissipation efficiency is improved.

[0034] As shown in the drawings, Figure 7 As shown, the second cover body 4 is provided with a third partition plate 401 for dividing the second cover body 4 into an upper cavity 406 and a lower cavity 407. In this embodiment, the third partition plate 401 uniformly divides the internal space of the second cover body 4, that is, the internal space of the upper cavity 406 and the lower cavity 407 is the same.

[0035] The opposite end surface of the second cover body 4 is respectively provided with a first air outlet 402 and a second air outlet 403, and the first air outlet 402 and the second air outlet 403 are arranged on the upper cavity and the lower cavity respectively. The inner wall of the first cover body 3 and the inner wall of the second cover body 4 are both provided with sound-absorbing cotton. As shown in the drawings, Figure 9 As shown, the cross-sectional shape of the second cover body 4 is isosceles trapezoidal, and the second cover body 4 is located between the left and right side surfaces of the cabinet body 6.

[0036] As shown in the drawings, Figures 8-11 As shown, in this embodiment, the first air outlet 402 and the second air outlet 403 are both provided with a mounting frame 404, and the outer end surface of the mounting frame 404 is provided with a plurality of blades 405 arranged in the height direction of the cabinet body 6 at intervals. The blades 405 include a first baffle arranged vertically, a second baffle and a third baffle arranged obliquely on both sides of the first baffle and connected to the lower end of the first baffle respectively, and a fourth baffle arranged vertically on the outer side and connected to the second baffle. The outer end surface of the mounting frame 404 is parallel to the outer end surface of the first cover body 3 connected thereto, and the two safety frames are located between the left and right side surfaces of the cabinet body 6.

[0037] The design of the mounting frame 404 and the plurality of blades 405 first facilitates the installation of the blades 405, which only need to be installed on the mounting frame 404 and then directly installed on the second cover body 4 through the mounting frame 404. In addition, the design facilitates quick air exhaust. If the blades 405 are directly installed on the second cover body 4, a mounting plate vertically placed inside the second cover body 4 is needed, which will block the airflow and prevent rainwater and dust from entering the second cover body 4, thereby avoiding the absorption cotton from being contaminated by rainwater and dust and affecting the sound absorption function of the absorption cotton. Compared with directly installing the blades 405 at the air outlet, the probability of the absorption cotton near the air outlet being contaminated by rainwater and dust increases. Since the mounting frame 404 has a width and the blades 405 are installed on the outer end surface of the mounting frame 404, the absorption cotton can be effectively prevented from being contaminated by rainwater and dust, the second cover body 4 can effectively reduce noise, and the service life of the absorption cotton is improved.

[0038] As shown in Figure 5 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, the energy storage inverter 7 is located above the electrical box 8, and the electrical box 8 is provided with a battery management system.

[0039] In this embodiment, as shown in Figure 4 The first cover body 3 and the second cover body 4 are directly installed on the outside of the cabinet air inlet plate and the air outlet plate 10. Only the bolts originally used to install the air outlet plate 10 and the cabinet and the bolts used to install the air inlet plate and the cabinet need to be removed. Then, one end of the first cover body is attached to the air inlet plate and connected to the cabinet through bolts, and one end of the second cover body is attached to the air outlet plate and connected to the cabinet through bolts. No additional space is needed to place the air outlet plate and the air inlet plate.

[0040] In this embodiment, the flow guide 5 can be a trumpet-shaped sleeve. The cross-sectional area of one end connected to the energy storage inverter 7 is smaller than the cross-sectional area of the other end connected to the upper cavity 406. The end of the flow guide 5 close to the upper cavity 406 is located in front of the rear end surface of the electrical box 8. The end of the flow guide 5 that penetrates through is close to and opposite to the communication part of the upper cavity 406 and the cabinet 6. The air outlet plate 10 abuts against the second partition plate 2, and the flow guide 5 is close to the air outlet plate 10. A gap is provided between the flow 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 exhausted by the energy storage inverter 7 and the electrical box 8 from the air exhausted by the liquid cooling unit 9. The third partition plate 401 is opposite to the attachment part of the energy storage inverter 7 and the electrical box 8.

[0041] Since the heat dissipation demand of the liquid cooling unit 9 is much larger than that of the electrical box 8, the third partition plate 401 evenly divides the internal space of the first cover body 3, which can ensure that the lower heat dissipation space is large enough to ensure effective heat dissipation of the liquid cooling unit 9.

[0042] In the embodiment, the position of the second cover body 4 relative to the cabinet body 6 is the position of the air outlet plate, in order not to change the structure of the cabinet body 6, the connecting hole of the air outlet plate 10 of the cabinet body 6 is directly used, and the upper cavity 406 and the lower cavity 407 are also required to ensure the maximum heat dissipation space as much as possible. The third partition plate 401 is opposite to the position where the energy storage inverter 7 and the electrical box 8 are attached.

[0043] Compared with directly discharging hot air, the second cover body 4 affects heat dissipation, but in the embodiment, one end of the flow guide 5 is opposite to the upper cavity 406, and the end of the flow guide 5 close to the upper cavity 406 is located in front of the rear end surface of the electrical box 8, so that the air discharged from the energy storage inverter 7 directly blows into the upper cavity 406, avoiding the air discharged from the electrical box 8 blowing to the energy storage inverter 7, causing heat backflow, improving the heat dissipation efficiency of the energy storage inverter 7, and the heat dissipation demand of the electrical box 8 is less than that of the energy storage inverter 7. Due to the characteristics of upward flow of hot air, the air discharged from the electrical box 8 flows to the upper cavity 406 through the gap between the flow guide 5 and the upper cavity 406.

[0044] The setting of the flow guide 5 can make the third partition plate 401 be arranged on the extension line of the position where the energy storage inverter 7 and the electrical box 8 are attached, that is, the third partition plate 401 uniformly divides the internal space of the first cover body 3, so that the heat dissipation space of the lower cavity 407 is large enough, and the influence on the heat dissipation of the liquid cooling unit 9 is reduced. If there is no flow guide 5, the air outlet plate 10 and the second partition plate 2 abut, and the third partition plate 401 is opposite to the position where the energy storage inverter 7 and the electrical box 8 are attached, the air discharged from the electrical box 8 will be guided by the air outlet plate 10 to blow to 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 discharged from the energy storage inverter 7 will also accumulate in the space enclosed by the rear end surface of the energy storage inverter 7, the rear end surface of the electrical box 8, the air outlet plate 10 and the second partition plate 2, affecting the heat dissipation. The third partition plate 401 needs to be moved downward, but this will reduce the heat dissipation space of the lower cavity 407.

[0045] The setting of the flow guide 5 can make the third partition plate 401 be arranged on the extension line of the position where the energy storage inverter 7 and the electrical box 8 are attached, that is, the third partition plate 401 uniformly divides the internal space of the first cover body 3, so that the heat dissipation space of the lower cavity 407 is large enough, and the influence on the heat dissipation of the liquid cooling unit 9 is reduced. If there is no flow guide 5, the air outlet plate 10 and the second partition plate 2 abut, and the third partition plate 401 is opposite to the position where the energy storage inverter 7 and the electrical box 8 are attached, the air discharged from the electrical box 8 will be guided by the air outlet plate 10 to blow to 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 discharged from the energy storage inverter 7 will also accumulate in the space enclosed by the rear end surface of the energy storage inverter 7, the rear end surface of the electrical box 8, the air outlet plate 10 and the second partition plate 2, affecting the heat dissipation. The third partition plate 401 needs to be moved downward, but this will reduce the heat dissipation space of the lower cavity 407.

[0046] The first cover body 3, the first partition plate 1, the second partition plate 2 and the upper cavity 406 enclose the first air duct for noise reduction and heat dissipation, air enters from the air inlet 301, passes through the first air duct, and then is discharged from the first air outlet 402; The first cover body 3, the second partition plate 2, the bottom plate of the cabinet body 6 and the lower cavity 407 enclose the second air duct for noise reduction and heat dissipation, air enters from the air inlet 301, passes through the second air duct, and then is discharged from the second air outlet 403.

[0047] In this embodiment, the air is extended through the first cover body 3, and the noise is reduced through the sound-absorbing cotton. The air is extended through the second cover body 4, and the noise is reduced through the sound-absorbing cotton. The first cover body 3, the second cover body 4, the first air duct, and the second air duct cooperate with each other and are indispensable. The noise reduction and the heat dissipation efficiency of the cabinet body are improved, and the problem of the heat dissipation efficiency affected by the noise reduction is reduced.

[0048] The active noise reduction subsystem includes a control module, a microphone array group arranged on the second cover body 4 and located at the internal communication position of the second cover body 4 and the cabinet body 6, and two distributed loudspeaker groups arranged on the second cover body 4 and close to the first air outlet 402 and the second air outlet 403. The control module is used for receiving the noise decibel information transmitted by the microphone array group, and is also used for controlling the distributed loudspeaker group to output the reverse sound wave signal.

[0049] The microphone array group includes a first microphone array arranged on the second cover body 4 and located at the internal communication position of the upper cavity 406 and the cabinet body 6, and a second microphone array arranged on the second cover body 4 and located at the internal communication position of the lower cavity 407 and the cabinet body 6.

[0050] The first microphone array and the second microphone array each include four microphones arranged in two rows and two columns. The four microphones in the first microphone array are respectively located at four corners of the internal communication position of the upper cavity 406 and the cabinet body 6. The four microphones in the second microphone array are respectively located at four corners of the internal communication position of the lower cavity 407 and the cabinet body 6.

[0051] The distributed loudspeaker group includes two loudspeakers. The two loudspeakers in the upper cavity 406 are respectively located close to the upper end of the first air outlet 402 and close to the lower end of the first air outlet 402. The two loudspeakers in the lower cavity 407 are respectively located close to the upper end of the second air outlet 403 and close to the lower end of the second air outlet 403.

[0052] When the environmental noise standard is loose, such as when the energy storage system is arranged in an industrial area (that is, for medium and high frequency noise reduction), or the environmental noise standard is between 55-70 dB (A), the passive noise reduction subsystem reduces the noise. The air enters the cabinet body 6 from the first cover body 3 air inlet 301 of the front end face of the cabinet body 6, enters the inside of the cabinet body 6, and is respectively discharged through the upper cavity 406 of the second cover body 4, the first air outlet 402, the lower cavity 407, and the second air outlet 403. When the environmental noise standard is strict, such as when the energy storage system is arranged in a residential area (i.e., for low-frequency noise reduction), or the environmental noise standard is less than or equal to 55 dB (A), the active noise reduction subsystem and the passive noise reduction subsystem cooperate to reduce noise. The wind enters from the first cover body 3 air inlet 301 of the front end face of the cabinet body 6, enters the inside of the cabinet body 6, and then respectively passes through the upper cavity 406 of the second cover body 4, the first air outlet 402, the lower cavity 407, and the second air outlet 403. At the same time, the microphone array group collects 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 value, the control module generates a reverse sound wave signal and outputs the reverse sound wave signal through the distributed loudspeaker group.

[0053] Specifically, when the energy storage system is arranged in a residential area, the first microphone array and the second microphone array collect environmental noise in real time, calculate the corresponding noise decibel, and transmit the calculated noise decibel to the control module, respectively. When the control module receives the noise decibel value of the first microphone array that is greater than the preset threshold value, the control module generates a reverse sound wave signal that is opposite in phase and equal in amplitude to the noise through an adaptive filtering algorithm, and outputs the reverse sound wave signal through the distributed loudspeaker group close to the first air outlet 402. When the control module receives the noise decibel value of the second microphone array that is greater than the preset threshold value, the control module generates a reverse sound wave signal that is opposite in phase and equal in amplitude to the noise through an adaptive filtering algorithm, and outputs the reverse sound wave signal through the distributed loudspeaker group close to the second air outlet 403.

[0054] In this embodiment, the determination of the threshold value can be achieved by measuring the noise reduction effect after installing the passive noise reduction subsystem during operation, and then determining the threshold value of the active noise reduction subsystem according to the environmental noise requirements, that is, the threshold value set in the control module is the sum of the noise reduction amount of the passive noise reduction subsystem and the minimum amount of environmental noise requirement. For example, the noise reduction amount of the passive noise reduction subsystem is 10 dBA, and the environmental requirement noise at one meter outside the cabinet is 60 dBA. When the control module receives the noise decibel value of the microphone array that is greater than the preset threshold value of 70 dBA, the control module automatically generates a reverse sound wave signal and outputs the reverse sound wave signal through the distributed loudspeaker group, thereby performing active noise reduction.

[0055] The active and passive combined energy storage noise reduction method uses the active and passive combined energy storage noise reduction system described above, and includes the following steps: S1: When the environmental noise standard is loose, the wind enters the first cover body 3 through the air inlet 301, and the first cover body 3 and the sound-absorbing cotton in the first cover body 3 cooperate to reduce noise, and the discharged wind passes through the upper cavity 406 and the lower cavity 407 in the second cover body 4 respectively, and the upper cavity 406 and the sound-absorbing cotton in the upper cavity 406 cooperate, and the lower cavity 407 and the sound-absorbing cotton in the lower cavity 407 cooperate to reduce noise, and the passive noise reduction subsystem automatically reduces noise for the energy storage system; S2: When the environmental noise standard is strict, the active noise reduction subsystem starts to reduce noise for the energy storage system, the microphone array group collects 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 value, the control module generates a reverse sound wave signal, and outputs the reverse sound wave signal through the distributed loudspeaker group, the wind enters the first cover body 3 through the air inlet 301, and the first cover body 3 and the sound-absorbing cotton in the first cover body 3 cooperate to reduce noise, and the discharged wind passes through the upper cavity 406 and the lower cavity 407 in the second cover body 4 respectively, and the upper cavity 406 and the sound-absorbing cotton in the upper cavity 406 cooperate, and the lower cavity 407 and the sound-absorbing cotton in the lower cavity 407 cooperate to reduce noise, and the active noise reduction subsystem and the passive noise reduction subsystem cooperate to reduce noise for the energy storage system.

[0056] The energy storage system includes the active and passive combined energy storage noise reduction system described above.

[0057] The above embodiments are only preferred embodiments of the present application, and cannot be used to limit the scope of protection of the present application, and any non-essential changes and substitutions made by those skilled in the art on the basis of the present application are within the scope of protection of the present application.

Claims

1. A combined active and passive energy storage and noise reduction system, characterized in that: It includes a passive noise reduction subsystem and an active noise reduction subsystem installed on the cabinet. The passive noise reduction subsystem is used to extend the exhaust path of the air at the air outlet inside the cabinet and reduce the noise of the air at the air outlet. The active noise reduction subsystem is used to actively output reverse sound wave signals for active noise reduction. According to environmental noise standards, noise reduction of cabinet exhaust can be achieved through a passive noise reduction subsystem, or by combining a passive noise reduction subsystem with an active noise reduction subsystem.

2. The active-passive combined energy storage and noise reduction system according to claim 1, characterized in that: The passive noise reduction subsystem includes a second cover set on the rear end face of the cabinet. The second cover is connected to the inside of the cabinet. 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 set on the upper cavity and the lower cavity. The inner wall of the second cover is provided with sound-absorbing cotton. The active noise cancellation subsystem includes a control module, a microphone array group installed on the second enclosure and located at the connection between the second enclosure and the cabinet interior, and two sets of distributed speaker groups installed inside the second enclosure and near the first and second air outlets, respectively. The control module is used to receive noise decibel information transmitted by the microphone array group and to control the distributed speaker groups to output reverse sound wave signals. When environmental noise standards are lenient, the passive noise reduction subsystem reduces noise. The air enters from the air inlet at the front of the cabinet, enters the cabinet, and then exits through the upper cavity of the second cover, the first air outlet, the lower cavity, and the second air outlet. The air extends its exhaust path through the second cover and is reduced by sound-absorbing cotton. When environmental noise standards are strict, the active noise reduction subsystem and the passive noise reduction subsystem work together to reduce noise. The air enters from the air inlet on the front side of the cabinet, enters the cabinet, and then exits through the upper cavity of the second cover, the first air outlet, the lower cavity, and the second air outlet. The air extends its exhaust path through the second cover and is reduced by sound-absorbing cotton. 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.

3. The active-passive combined energy storage and noise reduction system according to claim 2, characterized in that: The microphone array group includes a first microphone array arranged in rows and columns on the second cover and located at the connection between the upper cavity and the interior of the cabinet, and a second microphone array arranged in rows and columns on the second cover and located at the connection between the lower cavity and the interior of the cabinet. When the active noise cancellation subsystem is activated, the first microphone array and the second microphone array collect ambient noise in real time, calculate the corresponding noise decibels, and transmit the calculated noise decibels to the control module respectively. 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. 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.

4. The active-passive combined energy storage and noise reduction system according to claim 3, characterized in that: 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 connects to the cabinet, and in the second microphone array, the four microphones are located at the four corners where the lower cavity connects to the cabinet.

5. The active-passive combined energy storage and noise reduction system according to claim 2, characterized in that: The distributed loudspeaker group includes two loudspeakers. The two loudspeakers located in the upper cavity are respectively located near the upper end of the first air outlet and near the lower end of the first air outlet. The two loudspeakers located in the lower cavity are respectively located near the upper end of the second air outlet and near the lower end of the second air outlet.

6. The active-passive combined energy storage and noise reduction system according to claim 2, characterized in that: The passive noise reduction subsystem also includes a first cover set on the front face of the cabinet. The first cover is connected to the inside of the cabinet. The lower end face of the first cover is provided with an air inlet. The inner wall of the first cover is provided with sound-absorbing cotton. The air enters from the air inlet, enters the cabinet, and is then discharged from the first air outlet and the second air outlet respectively. The air extends the air intake path through the first cover and is reduced by the sound-absorbing cotton. The air extends the air exhaust path through the second cover and is reduced by the sound-absorbing cotton.

7. The active-passive combined energy storage and noise reduction system according to claim 6, characterized in that: The passive noise reduction subsystem also includes 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 the cabinet bottom plate; 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.

8. The active-passive combined energy storage and noise reduction system according to claim 2, characterized in that: The second cover has an isosceles trapezoidal cross-sectional shape and is located between the left and right sides of the cabinet.

9. A combined active and passive energy storage noise reduction method, characterized in that: The active-passive combined energy storage and noise reduction system according to any one of claims 1-7 includes the following steps: S1: When the environmental noise standard is relaxed, the wind enters the first enclosure through the air inlet. The first enclosure and the sound-absorbing cotton inside the first enclosure work together to reduce noise. The exhaust wind passes through the upper cavity and the lower cavity of the second enclosure respectively. The upper cavity and the sound-absorbing cotton inside the upper cavity work together, and the lower cavity and the sound-absorbing cotton inside the lower cavity work together to reduce noise. The passive noise reduction subsystem automatically reduces noise for the energy storage system. S2: When environmental noise standards are strict, the active noise reduction subsystem is activated to reduce noise for the energy storage system. The microphone array group collects environmental noise in real time, calculates the noise decibels, and transmits the calculated noise decibels 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. The air enters the first enclosure through the air inlet. The first enclosure and the sound-absorbing cotton inside the first enclosure work together to reduce noise. The exhaust air passes through the upper cavity and lower cavity of the second enclosure respectively. The sound-absorbing cotton in the upper cavity and the lower cavity work together to reduce noise. The active noise reduction subsystem and the passive noise reduction subsystem work together to reduce noise for the energy storage system.

10. An energy storage system, characterized in that: The active-passive combined energy storage and noise reduction system includes any one of claims 1-7.

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