Energy storage device, energy storage system and charging network

Abstract

The utility model provides an energy storage device, an energy storage system and a charging network, and belongs to the field of batteries. The energy storage device comprises a box body and a noise reducer. The noise reducer is connected with the box body which is provided with an air outlet. The noise reducer is provided with a noise reduction channel, a plurality of noise reduction holes and a plurality of noise reduction chambers. The noise reduction device is provided with a noise reduction channel extending in the first direction, the noise reduction device is further provided with a plurality of noise reduction chambers, the noise reduction chambers are mutually independent and are at least located on one side, in the second direction, of the noise reduction channel, the first direction intersects with the second direction, the noise reduction chambers are communicated with the noise reduction channel through noise reduction holes, and one noise reduction chamber is at least communicated with one noise reduction hole. The noise reduction channel communicates with the air outlet. Through combination of noise absorption of the noise reduction channels, diversion of the noise reduction holes and resonance dissipation of the noise reduction chambers, the noise reduction effect can be improved, compared with a traditional single sound absorption structure, the noise reduction efficiency is improved, and noise pollution generated during operation of the energy storage device is reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to an energy storage device, energy storage system and charging network. Background Technology

[0002] Energy conservation and emission reduction are key to sustainable social development. Rechargeable batteries, with their ability to store and release energy as needed, are widely used in various electrical devices and energy storage systems, and are an important component in promoting energy transition and sustainable development. For the new energy industry, battery technology is a crucial factor in its development.

[0003] Energy storage devices integrate various electronic components and operate at high power, often generating significant noise during operation. Current technologies fail to effectively reduce the noise of energy storage devices. Utility Model Content

[0004] This application aims to at least address one of the technical problems existing in the background art. Therefore, one object of this application is to provide an energy storage device, energy storage system, and charging network that can reduce the noise of the energy storage device.

[0005] An embodiment of the first aspect of this application provides an energy storage device, including: a housing having an air outlet; a noise reducer connected to the housing, the noise reducer having a noise reduction channel, a plurality of noise reduction holes and a plurality of noise reduction chambers, the plurality of noise reduction chambers being independent of each other, the noise reduction channel extending along a first direction, the plurality of noise reduction chambers being located at least on one side of the noise reduction channel along a second direction, the first direction intersecting the second direction, the plurality of noise reduction chambers being connected to the noise reduction channel through noise reduction holes, each noise reduction chamber being connected to at least one noise reduction hole, and the noise reduction channel being connected to the air outlet.

[0006] In the technical solution of this application embodiment, the noise reduction effect can be improved by combining sound absorption of the noise reduction channel, diversion of the noise reduction hole and resonance dissipation of the noise reduction chamber. Compared with the traditional single sound absorption structure, the noise reduction efficiency is improved and the noise pollution generated during the operation of the energy storage device is reduced.

[0007] In some embodiments, at least two of the multiple noise reduction chambers have different volumes. The composite noise generated by the operation of the energy storage device includes noise of multiple frequencies, and different frequency bands of noise require resonant cavities of different volumes for absorption. Noise reduction chambers of different volumes can form resonant spaces of multiple specifications. Small-volume noise reduction chambers can match the resonant absorption conditions of high-frequency noise, while large-volume noise reduction chambers can specifically capture mid- and low-frequency noise, thereby overcoming the limitation of a single-specification noise reduction chamber that can only absorb noise of a specific frequency band, and achieving coverage of composite noise sources.

[0008] In some embodiments, at least two of the multiple noise reduction holes have different cross-sectional areas. Noise reduction holes with different cross-sectional areas can reasonably divert airflow within the noise reduction channel, allowing noise of different intensities and frequencies to enter the corresponding noise reduction chambers as needed, thus avoiding mutual interference and energy superposition of noise of different frequencies within the channel.

[0009] In some embodiments, at least two of the multiple noise reduction holes have different depths. The depth of the noise reduction hole affects the propagation path and resonant frequency of sound waves within the hole. Noise reduction holes of different depths have differentiated filtering and conduction characteristics for noise in different frequency bands. Deeper noise reduction holes can extend the propagation path of mid-to-low frequency long-wavelength noise, utilizing the sound wave reflection interference effect within the hole to achieve initial attenuation of mid-to-low frequency noise. Combined with the resonant absorption of a large-volume noise reduction chamber, this improves the attenuation efficiency of mid-to-low frequency noise. Shallower noise reduction holes are more suitable for the conduction and initial attenuation of high-frequency short-wavelength noise, working synergistically with a small-volume noise reduction chamber to capture high-frequency electromagnetic noise and slight noise from the battery device. The combined design of noise reduction holes of different depths overcomes the limitation of a single-depth noise reduction hole only being able to adapt to a fixed frequency band of noise, achieving coverage of complex noise sources in energy storage devices.

[0010] In some embodiments, the multiple noise reduction chambers include a first noise reduction chamber, the multiple noise reduction holes include a first noise reduction hole, and the noise reducer includes: a first noise reduction pipe connected to the housing, with a noise reduction channel located in the first noise reduction pipe; a second noise reduction pipe connected to the housing, with the first noise reduction pipe located inside the second noise reduction pipe; and multiple first partitions, all located between the first and second noise reduction pipes, with each partition connected to both the first and second noise reduction pipes. The first partitions, the first noise reduction pipe, and the second noise reduction pipe form a first noise reduction chamber, and the first noise reduction hole is located in the first noise reduction pipe. The first and second noise reduction pipes are arranged in a nested layout, with the noise reduction channel located within the inner cavity of the inner first noise reduction pipe. The gap between the inner and outer pipes is used to form the first noise reduction chamber through the first partitions. This eliminates the need for additional external space to accommodate the noise reduction chamber, and facilitates the compact integration of the noise reducer with the housing without increasing the overall volume of the noise reducer.

[0011] In some embodiments, the noise reducer further includes: a first regulating tube connected to a first noise reduction pipe, a portion of which is located within a first noise reduction hole, and the other portion of which is located within a first noise reduction chamber. The length of the first regulating tube determines the propagation path and resonant frequency of the sound wave within the pipe, and its inner diameter can match the sound wave conduction requirements of different wavelengths. By adjusting the length and inner diameter of the first regulating tube, the conduction and attenuation characteristics of different frequency bands of noise, such as low-frequency fan noise and high-frequency electromagnetic noise, can be adapted: for low-frequency long-wavelength noise, a longer first regulating tube with a larger inner diameter can be configured to extend the sound wave propagation path and reduce the conduction resistance, thereby increasing the sound wave energy density entering the large-volume first noise reduction chamber and enhancing the resonance noise reduction effect; for high-frequency short-wavelength noise, a shorter first regulating tube with a smaller inner diameter can be selected to optimize the sound wave conduction efficiency, achieving efficient absorption in conjunction with a small-volume first noise reduction chamber, thus broadening the effective noise reduction frequency band of the noise reducer.

[0012] In some embodiments, the noise reducer includes a plurality of first regulating tubes, each first regulating tube corresponding to at most one first noise reduction hole, and at least two of the plurality of first regulating tubes having different lengths. The combination of multiple first regulating tubes of different lengths enables noise reduction across the entire frequency range from high frequency to mid-low frequency, improving the noise reduction effect and making it easier for the noise emissions of the energy storage device to meet the environmental protection standards of densely populated areas such as residential communities and commercial parks.

[0013] In some embodiments, the plurality of noise reduction chambers further include a second noise reduction chamber, and the plurality of noise reduction holes further include a second noise reduction hole. The noise reducer further includes: a noise reduction element located in the noise reduction channel, the noise reduction element being connected to the first noise reduction pipe, and multiple parts of the noise reduction channel divided by the noise reduction element being connected to the air outlet. The second noise reduction chamber and the second noise reduction hole are both located in the noise reduction element, and the second noise reduction chamber is connected to the noise reduction channel through the second noise reduction hole. Each second noise reduction chamber is connected to at least one second noise reduction hole. When the energy storage device is running, the noisy hot airflow enters the noise reduction channel through the air outlet of the housing and is first divided into multiple airflows by the noise reduction element, which flow through each sub-channel. During this process, the sound waves in the airflow will achieve noise reduction through two paths: one is that some sound waves pass through the first noise reduction hole and enter the first noise reduction chamber, where they are attenuated through resonance; the other is that some sound waves pass through the second noise reduction hole in the inner wall of the sub-channel and enter the second noise reduction chamber, where they are attenuated through the combined effect of cavity resonance and material adsorption. Finally, the airflow that has undergone dual noise reduction treatment merges along each sub-channel and is discharged, achieving a synergy between heat dissipation and noise reduction.

[0014] In some embodiments, the noise reduction element includes: a first noise reduction plate connected to a first noise reduction pipe; a second noise reduction plate opposite to the first noise reduction plate; and a plurality of second partitions located between the first and second noise reduction plates. The second partitions are connected to both the first and second noise reduction plates, and the second partitions, the first noise reduction plate, and the second noise reduction plate form a second noise reduction chamber. A second noise reduction hole is located in one of the first and second noise reduction plates. The second noise reduction chamber is rigidly enclosed by the first noise reduction plate, the second noise reduction plate, and the second partitions. It has a simple structure, high structural strength, and good stability, effectively resisting airflow impact and vibration during the operation of the energy storage device, avoiding resonant frequency shift due to cavity deformation, and ensuring long-term stable noise reduction performance.

[0015] In some embodiments, the noise reduction device further includes a second regulating tube connected to one of the first and second noise reduction plates. A portion of the second regulating tube is located within the second noise reduction hole, and the other portion is located within the second noise reduction chamber. The length and inner diameter of the second regulating tube directly affect the propagation path, resonant frequency, and energy attenuation efficiency of sound waves within the tube. Targeted design allows for precise adaptation to different frequency bands of noise. For small-volume second noise reduction chambers adapted to high-frequency noise, a shorter second regulating tube with a smaller inner diameter can be configured to reduce energy loss during high-frequency sound wave transmission, ensuring efficient entry into the cavity for resonant absorption. For large-volume second noise reduction chambers adapted to mid-to-low-frequency noise, a longer second regulating tube with a larger inner diameter can be used to extend the propagation path of mid-to-low-frequency sound waves. Reflection interference within the tube pre-consumes some energy, and this, combined with cavity resonance, enhances the attenuation effect. This design overcomes the limitations of the fixed conduction characteristics of a single second noise reduction hole, further broadening the effective noise reduction frequency band of each second noise reduction chamber and better adapting to the complex characteristics of composite noise in energy storage devices.

[0016] In some embodiments, the noise reducer includes a plurality of second regulating tubes, each second regulating tube corresponding to at most one second noise reduction hole, and at least two of the plurality of second regulating tubes having different lengths. The combination of multiple second regulating tubes of different lengths achieves noise reduction across the entire frequency range from high frequency to mid-low frequency, improves the noise reduction effect, and makes it easier for the noise emissions of the energy storage device to meet the environmental protection standards of densely populated areas such as residential communities and commercial parks.

[0017] In some embodiments, the noise reduction device includes multiple noise reduction elements spaced apart from each other. By deploying multiple noise reduction elements, the number of second noise reduction chambers can be expanded, thereby configuring more second noise reduction chambers of different sizes to effectively reduce multi-frequency noise and improve overall noise reduction performance.

[0018] In some embodiments, the noise reducer further includes a sound-absorbing layer, located at least in one of the noise reduction channel and the noise reduction chamber.

[0019] An embodiment of the second aspect of this application provides an energy storage system, including a power conversion device and an energy storage device according to any of the above embodiments. The power conversion device is used to electrically connect a power generation device and an energy storage device. By utilizing the porous and loose structural characteristics of the sound-absorbing layer, noise waves entering the noise reduction chamber or noise reduction channel undergo multiple reflections and refractions within the pores, inducing fiber vibration and converting the mechanical energy of the sound waves into heat energy for dissipation, thereby attenuating noise energy and improving the noise reduction effect.

[0020] An embodiment of the third aspect of this application provides a charging network including a charging pile and an energy storage device or energy storage system as described in any of the above embodiments, the energy storage device or energy storage system being used to provide electrical energy to the charging pile.

[0021] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0022] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0023] Figure 1 This application provides schematic diagrams of the structure of an energy storage system according to some embodiments.

[0024] Figure 2 This is a schematic diagram of the structure of a charging network provided in some embodiments of this application;

[0025] Figure 3 This is a schematic diagram of the structure of an energy storage device provided in an embodiment of this application;

[0026] Figure 4 This is a schematic diagram of the structure of a noise reduction device provided in an embodiment of this application;

[0027] Figure 5 This is a structural schematic diagram of a noise reducer provided in an embodiment of this application from another perspective;

[0028] Figure 6 A simplified cross-sectional view of a noise reduction device provided in another embodiment of this application;

[0029] Figure 7 A simplified cross-sectional view of a noise reduction device provided in another embodiment of this application;

[0030] Figure 8A simplified layout diagram of noise reduction holes provided for an embodiment of this application;

[0031] Figure 9 A simplified cross-sectional schematic diagram of a first noise reduction hole provided in an embodiment of this application;

[0032] Figure 10 A top view of a noise reduction element provided in an embodiment of this application;

[0033] Figure 11 for Figure 10 A schematic diagram of the cross-section of surface AA;

[0034] Figure 12 This is a partial structural schematic diagram of a noise reduction element provided in an embodiment of this application;

[0035] Figure 13 for Figure 12 Enlarged view of point B in the middle;

[0036] Figure 14 This is a simplified cross-sectional schematic diagram of a second noise reduction hole provided in an embodiment of this application.

[0037] Explanation of reference numerals in the attached figures:

[0038] 200, Energy storage device; 300, Power conversion equipment; 400, Power generation equipment; 500, Charging pile; 600, Connector; 10, Housing; 20, Noise reducer; 21, Noise reduction channel; 22, Noise reduction hole; 221, First noise reduction hole; 222, Second noise reduction hole; 23, Noise reduction chamber; 231, First noise reduction chamber; 232, Second noise reduction chamber; 201, First noise reduction pipe; 202, Second noise reduction pipe; 203, First partition; 204, First regulating pipe; 205, Noise reduction element; 251, First noise reduction plate; 252, Second noise reduction plate; 253, Second partition; 206, Second regulating pipe. Detailed Implementation

[0039] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0041] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0042] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0043] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0044] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0045] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element 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 the embodiments of this application.

[0046] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0047] Currently, the application of rechargeable batteries is becoming increasingly widespread, judging from market trends. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in various electronic devices, such as electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As the application areas of rechargeable batteries continue to expand, the market demand is also constantly increasing.

[0048] Against the backdrop of the rapid development of the new energy industry, energy storage devices, as core equipment for energy storage and peak shaving, are widely used in various scenarios such as industrial parks, residential communities, and new energy power plants. During continuous operation, the numerous batteries inside the energy storage device generate significant heat during charge and discharge cycles. At the same time, the supporting electronic components such as the BMS battery management system and PCS energy storage converter also generate continuous heat when operating at high frequencies, causing the internal temperature of the device to rise rapidly.

[0049] Temperature is a key factor affecting the operational stability, safety, and lifespan of energy storage devices. When the internal temperature exceeds the rated operating range, it not only reduces the charging and discharging efficiency of the battery device and accelerates the capacity decay rate, but may also trigger the risk of thermal runaway, and in severe cases, even lead to safety accidents such as battery fires and explosions. At the same time, high-temperature environments also affect the signal transmission accuracy and operational reliability of electronic components, increase the probability of equipment failure, and thus affect the overall operating efficiency of the energy storage system.

[0050] To effectively dissipate the accumulated heat and maintain the normal operating temperature of the equipment, existing energy storage devices are generally equipped with air-cooling systems. These systems use multiple sets of fans running at high speed to create airflow circulation, quickly expelling the internal heat to the outside. However, during the high-speed rotation of the fans, the intense friction between the fan blades and the air, as well as the mechanical vibration of the motor, generate significant noise. This noise is mostly low-to-medium frequency, travels long distances, has strong penetrating power, and can easily cause continuous interference in the surrounding environment.

[0051] During charging and discharging, the internal battery device generates slight noise due to ion migration and electrode reactions. High-frequency oscillations of electronic components and changes in circuit current also produce electromagnetic noise. This noise, combined with the fan noise, creates a complex noise source. Especially when energy storage devices are deployed in densely populated areas such as residential communities and commercial parks, continuous noise pollution can severely impact the daily lives and rest of nearby residents, and may even lead to neighborhood disputes, failing to meet environmental noise reduction policy requirements and the needs of the people.

[0052] The embodiments of this application provide an energy storage device that, through optimized structural design and noise reduction mechanism, can achieve efficient noise reduction while ensuring normal heat dissipation and stable operation of the device, significantly reducing noise pollution generated during the operation of the energy storage device, and balancing device performance and the comfort of the surrounding environment.

[0053] This application also provides an energy storage device, which may be, but is not limited to, an energy storage container, an energy storage cabinet, an energy storage power station, an energy storage battery pack, or a portable energy storage system.

[0054] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of an energy storage system provided in some embodiments of this application. Embodiments of this application provide an energy storage device 200, including one or more battery clusters to increase the voltage and capacity of the energy storage device 200. A battery cluster may include multiple battery devices, which are connected in series via a busbar to increase the voltage of the energy storage device 200. When the energy storage device 200 includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device 200. The energy storage device 200 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. The energy storage device 200 can store electrical energy as needed and output electrical energy when appropriate. For example, the energy storage device 200 can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. The energy storage system provided in this application can be any power system that requires the energy storage device 200. In some embodiments, the energy storage device 200 is an energy storage container or an energy storage cabinet.

[0055] In some embodiments, the energy storage device 200 may include a cabinet and one or more battery clusters housed in the cabinet.

[0056] In some embodiments, the energy storage device 200 may include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module.

[0057] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device via piping to regulate the temperature of the individual battery cells.

[0058] As an example, the main control module can serve as the battery management unit for the battery cluster, used to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For instance, it can control the charging and discharging current and voltage of the battery cluster. The main control module includes modules such as an auxiliary battery management unit (SBMU) and a fusion switch.

[0059] As an example, the central control module can serve as the battery management unit of the energy storage device 200, used to monitor and manage the energy storage device 200. The central control module can monitor information such as the current, voltage, power, state of charge, or temperature of the energy storage device 200. For example, it can control the charging and discharging current and voltage of the energy storage device 200. As an example, the central control module includes modules such as an insulation monitoring module (IMM), a master battery management unit (MBMU), an Ethernet (ETH) module, and a fiber optic conversion module.

[0060] As an example, a fire protection system includes control panels, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in energy storage systems.

[0061] As an example, the power distribution unit can be used to distribute power to the power modules of the energy storage device 200.

[0062] In some embodiments, the energy storage system may include one or more energy storage devices 200 and a power converter system (PCS), wherein the power converter system 300 is connected between the power generation device 400 and the energy storage device 200. The power generation device 400 generates electrical energy, which can be stored in the energy storage device 200 through the power converter system 300, and the electrical energy stored in the energy storage device 200 can be released back to the power generation device 400 through the power converter system 300. As an example, the power generation device 400 may specifically be a power grid, a solar panel, a hydroelectric power generation device 400, a thermal power generation device 400, a wind power generation device 400, etc. The specific type of the power generation device 400 is not limited in this application.

[0063] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the structure of a charging network provided in some embodiments of this application. Embodiments of this application provide a charging network including a charging pile 500 and an energy storage device 200. The charging pile 500 is electrically connected to the energy storage device 200, which provides electrical energy to the charging pile 500. The charging pile 500 is electrically connected to a battery device in the energy storage device 200 via a cable, and the battery device can provide its stored electrical energy to the charging pile 500. The charging pile 500 has one or more connectors 600 for connecting to electrical equipment (such as a vehicle), thereby enabling the charging equipment to receive additional power.

[0064] The energy storage device 200 can be located inside the charging pile 500 (e.g., an integrated energy storage and charging unit) or outside the charging pile 500.

[0065] This application provides an energy storage device 200. Figure 3 This is a schematic diagram of an energy storage device provided in an embodiment of this application. See also... Figure 3 The energy storage device 200 includes a housing 10 and a noise reducer 20. The noise reducer 20 is connected to the housing 10, and the housing 10 has an air outlet.

[0066] Figure 4 This is a schematic diagram of a noise reduction device provided in an embodiment of this application. Figure 5 This is a schematic diagram of the structure of a noise reduction device provided in an embodiment of this application, viewed from another perspective. See also... Figure 4 and Figure 5 The noise reduction device 20 has a noise reduction channel 21 and a plurality of noise reduction holes 22, and the noise reduction channel 21 extends along the first direction X.

[0067] Figure 6 A simplified cross-sectional view of a noise reduction device provided for another embodiment of this application. Figure 7 A simplified cross-sectional view of a noise reduction device according to another embodiment of this application. See also Figure 6 and Figure 7 The noise reduction device 20 also has multiple noise reduction chambers 23, which are independent of each other. The multiple noise reduction chambers 23 are located at least on one side of the noise reduction channel 21 along the second direction. The first direction X intersects with the second direction. The multiple noise reduction chambers 23 are all connected to the noise reduction channel 21 through noise reduction holes 22. Each noise reduction chamber 23 is connected to at least one noise reduction hole 22. The noise reduction channel 21 is connected to the air outlet.

[0068] The housing 10 has a receiving cavity, in which the battery device is located. An air outlet is connected to the receiving cavity, and a fan discharges hot gas from the receiving cavity through the air outlet. Since the noise reduction channel 21 is connected to the air outlet, it can absorb noise generated during fan operation. This forms a gas flow path from the receiving cavity to the noise reduction channel 21 and then to the external environment, which neither obstructs the discharge of cooling airflow nor hinders the reduction of noise carried during the flow process.

[0069] In the embodiments of this application, the noise reduction device 20 is located outside the receiving cavity of the housing 10, and the noise reduction device 20 can be connected to the top wall or side wall of the housing 10; the noise reduction device 20 is detachably connected to the housing 10, for example, the noise reduction device 20 is fixed to the housing 10 with bolts or snap-fit ​​connection; or the noise reduction device 20 is non-detachably connected to the housing 10, for example, the noise reduction device 20 is welded to the housing 10 or integrally formed.

[0070] The noise reduction channel 21 extends along a first direction X, which can be a straight line or a curve. The cross-sectional shape of the noise reduction channel 21 matches the air outlet of the housing 10 (it can be circular, rectangular, etc.), and the inner wall of the noise reduction channel 21 can be coated with a sound-absorbing material, such as porous ceramic or fiber cotton.

[0071] Multiple noise reduction chambers 23 are independent of each other and not connected to each other, avoiding noise interference between different chambers. All noise reduction chambers 23 are distributed at least on one side of the noise reduction channel 21 along the second direction, or they can be symmetrically distributed on both sides of the noise reduction channel 21, or all noise reduction chambers 23 can be arranged around the noise reduction channel 21 to form a surround noise reduction structure.

[0072] It should be noted that the multiple noise reduction chambers 23 are independent of each other, meaning that the multiple noise reduction chambers 23 are not directly connected to each other. Since the multiple noise reduction chambers 23 are all connected to the noise reduction channel 21 through the noise reduction hole 22, that is, the multiple noise reduction chambers 23 are indirectly connected to each other.

[0073] In the embodiments of this application, the second direction is perpendicular to the first direction X or forms a preset angle with it, such as 90°, 80°, 70°, 60°, 50°, or 40°. The second direction is not fixed, as long as it intersects with the first direction X.

[0074] The noise reduction hole 22 serves as a connecting bridge between the noise reduction channel 21 and the noise reduction chamber 23. Each noise reduction chamber 23 corresponds to at least one noise reduction hole 22. Some large noise reduction chambers may correspond to two or even more evenly distributed noise reduction holes 22, ensuring that the noise in the noise reduction channel 21 can be introduced into the noise reduction chamber 23 through the noise reduction hole 22.

[0075] The shape of the noise reduction hole 22 is not limited. For example, the noise reduction hole 22 can be a round hole, a rectangular hole, a triangular hole, or other polygonal holes or other irregularly shaped holes.

[0076] The shape of the noise reduction chamber 23 is not limited. For example, the noise reduction chamber 23 can be a rectangular chamber, a cylindrical chamber, a spherical chamber, or other irregularly shaped chambers.

[0077] The composite noise generated during the operation of the energy storage device 200 (formed by the superposition of mechanical noise from the fan, battery device, and electromagnetic noise from electronic components) enters the noise reduction channel 21 of the noise reducer 20 from the air outlet of the housing 10 along with the hot gas. After the composite noise enters the noise reduction channel 21 with the airflow, it comes into contact with the sound-absorbing material on the inner wall of the noise reduction channel 21, and some of the noise energy is absorbed by the material and converted into heat energy for dissipation. On the other hand, due to the presence of the noise reduction holes 22, the noise waves are guided through the noise reduction holes 22 to multiple noise reduction chambers 23, realizing the diversion and diffusion of noise and avoiding the concentrated propagation of noise in a single channel. When the noise enters the noise reduction chamber 23 through the noise reduction holes 22, it will undergo multiple reflections and refractions within the noise reduction chamber 23, and the sound waves interfere with each other to cancel each other out, thus achieving noise attenuation. Throughout the noise reduction process, the hot gas still flows smoothly out along the first direction X of the noise reduction channel 21. The design of the noise reduction holes 22 does not significantly increase airflow resistance, and the independent structure of the noise reduction chambers 23 does not interfere with the mainstream gas flow, ensuring that the heat dissipation efficiency is not affected.

[0078] The energy storage device 200 provided in this application embodiment can improve the noise reduction effect by combining the sound absorption of the noise reduction channel 21, the diversion of the noise reduction hole 22 and the resonance dissipation of the noise reduction chamber 23. Compared with the traditional single sound absorption structure, the noise reduction efficiency is improved and the noise pollution generated by the energy storage device 200 during operation is reduced.

[0079] The noise reduction device 20 consists of a noise reduction channel 21, noise reduction holes 22, and a noise reduction chamber 23. It has a small number of components, a compact structure, and low manufacturing cost. The independent noise reduction chamber 23 design avoids noise crosstalk, and the cooperation of multiple noise reduction holes 22 with the noise reduction chamber 23 expands the noise treatment range. The noise reduction channel 21 is designed along the main direction of hot gas exhaust, ensuring that internal hot gas can be quickly discharged, maintaining the rated operating temperature of the battery and electronic components. The distribution and number of noise reduction chambers 23 can be flexibly adjusted according to the size and noise intensity of the energy storage device 200, making it suitable for small energy storage devices in residential communities as well as meeting the noise reduction needs of large energy storage systems in industrial parks and new energy power plants, demonstrating strong versatility. It effectively reduces the operating noise of the energy storage device, meets environmental noise reduction policy requirements, solves the noise pollution problem of energy storage devices in densely populated areas, and improves the living comfort of surrounding residents.

[0080] The presence of the noise reducer 20 reduces the vibration interference of noise on the internal electronic components of the energy storage device 200, and reduces the probability of failure of precision equipment such as the BMS battery management system and the PCS energy storage converter. At the same time, the combination of a stable heat dissipation environment and noise reduction effect avoids the impact of high temperature and noise on the performance of the battery device, slows down the capacity decay of the battery device, and extends the overall service life of the energy storage device 200.

[0081] According to some embodiments of this application, at least two of the multiple noise reduction chambers 23 have different volumes.

[0082] For example, a portion of the noise reduction chamber 23 has a volume greater than or equal to 1 × 10⁻⁶. -4 cubic meters (m 3 Less than or equal to 1×10 -2 m 3 The volume of the other noise reduction chamber 23 is greater than or equal to 5 × 10⁻⁶. -4 cubic meters (m 3 Less than or equal to 2 × 10 -3 m 3 .

[0083] For example, the volume of the multiple noise reduction chambers 23 can be divided into two specifications: some noise reduction chambers 23 have the same volume, while the rest have a uniform volume; or, depending on the requirements, the noise reduction chambers 23 can be set to 3, 5, 10, 50, 100 or even more specifications. Alternatively, any two noise reduction chambers 23 among the multiple noise reduction chambers 23 may have different volumes.

[0084] In the embodiments of this application, the shapes of the multiple noise reduction chambers 23 can be the same or different, or the shapes of the multiple noise reduction chambers 23 can be divided into two specifications, that is, some noise reduction chambers 23 have the same shape, and the remaining noise reduction chambers 23 have a uniform shape; or the noise reduction chambers 23 can be set to 3, 5, 10, 50, 100 or even more specifications and shapes as needed. Alternatively, any two noise reduction chambers 23 may have different shapes.

[0085] The noise reduction chamber 23 forms a resonant space. When the noisy airflow passes through the noise reduction channel 21, noise of different frequency bands will enter the noise reduction chamber 23, which matches its resonant frequency, through the noise reduction hole 22. Resonant attenuation will be formed in the noise reduction chamber 23, reducing the noise energy.

[0086] The complex noise generated by the energy storage device 200 includes noise of multiple frequencies, and different frequency bands of noise require resonant cavities of different volumes for absorption. Noise reduction chambers 23 of different volumes can form resonant spaces of various sizes. Small-volume noise reduction chambers 23 can match the resonant absorption conditions of high-frequency noise, while large-volume noise reduction chambers 23 can specifically capture mid- and low-frequency noise, thereby overcoming the limitation of a single-size noise reduction chamber 23 that can only absorb noise of a specific frequency band, and achieving coverage of complex noise sources.

[0087] The combination of noise reduction chambers 23 of different volumes can avoid the reflection and superposition of noise in a single space, further improve the noise reduction effect, effectively reduce the noise intensity radiated outward by the energy storage device 200, and meet the noise emission standards of densely populated areas such as residential communities and commercial parks.

[0088] The differentiated volume design of the noise reduction chamber 23 can flexibly adapt to the overall layout of the noise reducer 20 without requiring additional space for the noise reducer 20. Within the limited structural space, by rationally combining noise reduction chambers 23 of different volumes, it is possible to absorb noise across multiple frequency bands while avoiding space waste caused by noise reduction chambers 23 of uniform volume, thus achieving a balance between noise reduction performance and space utilization efficiency, and facilitating the integrated installation of the noise reducer 20 and the enclosure 10.

[0089] According to some embodiments of this application, at least two of the plurality of noise reduction holes 22 have different cross-sectional areas.

[0090] For example, the cross-sectional area of ​​the noise reduction aperture 22 is greater than or equal to 1 square millimeter (mm²). 2 ), less than or equal to 5000 square millimeters (mm) 2 The cross-sectional area of ​​the noise reduction aperture 22 is greater than or equal to 50 square millimeters (mm). 2 ), less than or equal to 2000 square millimeters (mm) 2 );

[0091] For example, the cross-sectional areas of the multiple noise reduction holes 22 can be divided into two specifications: some noise reduction holes 22 have the same cross-sectional area, while the cross-sectional areas of the remaining noise reduction holes 22 are uniform; or they can be set to 3, 5, 10, 50, 100 or even more specifications of cross-sectional area as needed. Alternatively, the cross-sectional areas of any two noise reduction holes 22 can be different.

[0092] Figure 8 This is a simplified layout diagram of noise reduction holes provided in an embodiment of this application. See also... Figure 8 The multiple noise reduction holes 22 can have the same or different shapes, or the shapes of the multiple noise reduction holes 22 can be divided into two specifications, that is, some noise reduction holes 22 have the same shape, and the rest of the noise reduction holes 22 have a uniform shape; or they can be set to 3, 5, 10, 50, 100 or even more specifications of noise reduction holes 22 according to the requirements. Alternatively, any two noise reduction holes 22 can have different shapes.

[0093] Each noise reduction aperture 22 is connected to the noise reduction channel 21 at one end and to each noise reduction chamber 23 at the other end, with each noise reduction chamber 23 corresponding to at least one noise reduction aperture 22. Depending on the size of the noise reduction chambers 23, noise reduction apertures 22 with different cross-sectional areas can be matched: for example, a larger noise reduction chamber 23 can be connected to a noise reduction aperture 22 with a larger cross-sectional area, and a smaller noise reduction chamber 23 can be connected to a noise reduction aperture 22 with a smaller cross-sectional area; or a larger noise reduction chamber 23 can be connected to a noise reduction aperture 22 with a smaller cross-sectional area, and a smaller noise reduction chamber 23 can be connected to a noise reduction aperture 22 with a larger cross-sectional area; or, depending on the target noise reduction frequency band requirements, noise reduction apertures 22 with different cross-sectional areas can be connected to noise reduction chambers 23 of the same size.

[0094] The frequency characteristics of noise are related to the wavelength of sound waves. Noise reduction holes 22 with different cross-sectional areas have different transmission efficiencies for sound waves of different wavelengths. Noise reduction holes 22 with larger cross-sectional areas are more conducive to the entry of long-wavelength noise in the mid-low frequency range, allowing such noise to be smoothly conducted into the noise reduction chamber 23 to complete resonance attenuation. Noise reduction holes 22 with smaller cross-sectional areas are more suitable for the passage of short-wavelength noise in the high frequency range, and can guide high-frequency noise into the noise reduction chamber 23 to achieve noise absorption.

[0095] The noise reduction holes 22 with different cross-sectional areas can reasonably divert the airflow in the noise reduction channel, so that noise of different intensities and frequencies can enter the corresponding noise reduction chambers 23 as needed, avoiding mutual interference and energy superposition of noise of different frequencies in the channel.

[0096] During the structural design phase of the noise reducer, the cross-sectional area of ​​the noise reduction holes 22 can be adjusted to flexibly adapt to combination schemes of noise reduction chambers 23 of different volumes without requiring significant modifications to the overall frame of the noise reducer 20. For different application scenarios, the noise reduction effect can be controlled simply by adjusting the ratio of the number of noise reduction holes 22 of different areas, significantly reducing the cost of customized design and improving the product's adaptability to different scenarios.

[0097] For example, the noise reduction hole 22 can be a circular hole with a radius greater than or equal to 1 mm and less than or equal to 50 mm; or a radius greater than or equal to 4 mm and less than or equal to 25 mm.

[0098] For example, the noise reduction aperture 22 can be a rectangular aperture with a side length greater than or equal to 1 mm and less than or equal to 50 mm; and a radius greater than or equal to 4 mm and less than or equal to 25 mm.

[0099] According to some embodiments of this application, at least two of the plurality of noise reduction holes 22 have different depths.

[0100] In the embodiments of this application, noise reduction holes 22 of different depths can be designed according to the volume specifications of the noise reduction chamber 23 and the differences in the target noise reduction frequency band: for noise reduction holes 22 that match a large volume noise reduction chamber 23 and are used to reduce low- and mid-frequency noise, a larger depth can be set; for noise reduction holes 22 that match a small volume noise reduction chamber 23 and are used to absorb high-frequency noise, a smaller depth can be configured; noise reduction holes 22 of different depths can also be connected on the same noise reduction chamber 23 to broaden the effective noise reduction frequency band range of the noise reduction chamber.

[0101] When the noisy airflow passes through the noise reduction channel 21, the sound waves will penetrate the noise reduction holes 22 at different depths and enter the corresponding noise reduction chamber 23. During the propagation process in the channel of the noise reduction hole 22, the sound wave energy will be initially attenuated due to the friction of the hole wall and reflection interference. Finally, the noise will be further reduced in the noise reduction chamber 23 through the resonance effect.

[0102] For example, the depth of the noise reduction hole 22 can be adjusted by changing the wall thickness of the noise reduction channel 21; or the depth of the noise reduction hole 22 can be adjusted by attaching tubular components of different lengths inside the noise reduction hole 22, in which case the depth of the noise reduction hole 22 is the length of the tubular component.

[0103] It should be noted that the depth of the noise reduction hole 22 mentioned in the embodiments of this application specifically refers to its effective depth, that is, the path length that the airflow travels from leaving the noise reduction channel 21 to fully entering the noise reduction chamber 23.

[0104] The depth of the noise reduction aperture 22 affects the propagation path and resonant frequency of sound waves within the aperture. Different depths of the noise reduction aperture 22 exhibit differentiated filtering and conduction characteristics for noise in different frequency bands. Deeper apertures 22 can extend the propagation path of mid-to-low frequency long-wavelength noise, utilizing the sound wave reflection interference effect within the aperture to achieve initial attenuation of mid-to-low frequency noise. Combined with the resonant absorption of the large-volume noise reduction chamber 23, this enhances the attenuation efficiency of mid-to-low frequency noise. Shallower apertures 22 are better suited for the conduction and initial attenuation of high-frequency short-wavelength noise, working synergistically with the small-volume noise reduction chamber 23 to capture high-frequency electromagnetic noise and slight noise from the battery device. This combined design of apertures 22 at different depths overcomes the limitation of a single-depth aperture 22 only being suitable for fixed-frequency noise, achieving coverage of the composite noise sources of the energy storage device 200.

[0105] A noise reduction aperture 22 of a single depth can only achieve noise attenuation during the resonance stage of the noise reduction chamber 23. However, noise reduction apertures of varying depths can construct a dual-layer noise reduction structure, combining initial attenuation through the aperture 22 channels with resonant attenuation through the noise reduction chamber 23. Before entering the noise reduction chamber 23, sound waves undergo frictional loss and sound wave reflection cancellation within the aperture 22 channels of different depths, thus consuming some noise energy in advance. After entering the noise reduction chamber 23, the remaining noise energy is further reduced through the resonance effect. This dual-layer attenuation mechanism, compared to the noise reduction mode that relies solely on the resonance of the noise reduction chamber 23, can improve the overall noise reduction amplitude and further reduce the noise intensity radiated outward by the energy storage device 200.

[0106] During the structural design and subsequent optimization of the noise reducer 20, the depth of the noise reduction holes 22 can be adjusted to flexibly adapt to combination schemes of noise reduction chambers 23 of different volumes, without requiring significant changes to the overall layout of the noise reduction channel 21 and the noise reduction chamber 23. To address the noise control needs of different scenarios such as residential communities, industrial parks, and new energy power plants, the number ratio of noise reduction holes 22 at different depths can be adjusted to control the noise reduction effect. This design reduces the cost of structural modifications and improves the product's adaptability to various scenarios and the ease of subsequent upgrades.

[0107] After entering the noise reduction chamber 23, the noise interacts elastically with the air inside the chamber, resonating at a specific frequency (resonance frequency). f The calculation formula is .in, f is the resonant frequency, measured in Hertz (Hz); c is the speed of sound in a medium, which is approximately 343 m / s in normal air temperature. S The cross-sectional area of ​​the noise reduction hole is expressed in square meters (m²). V The volume of the noise reduction room is expressed in cubic meters (m³). L eff The effective length of the noise reduction aperture is expressed in meters (m). The effective length of the noise reduction aperture is positively correlated with the depth of the noise reduction aperture 22.

[0108] Based on the above formula, adjusting any parameter such as the volume of the noise reduction chamber 23, the cross-sectional area of ​​the noise reduction hole 22, or the depth of the noise reduction hole 22 can change the resonant frequency, thereby achieving targeted noise reduction for different frequencies.

[0109] According to some embodiments of this application, see Figure 6 and Figure 7The system includes multiple noise reduction chambers 23, including a first noise reduction chamber 231, and multiple noise reduction holes 22, including a first noise reduction hole 221. The noise reducer 20 includes a first noise reduction pipe 201, a second noise reduction pipe 202, and multiple first partitions 203. Both the first noise reduction pipe 201 and the second noise reduction pipe 202 are connected to the housing 10. A noise reduction channel 21 is located within the first noise reduction pipe 201, and the first noise reduction pipe 201 is located within the second noise reduction pipe 202. Multiple first partitions 203 are located between the first noise reduction pipe 201 and the second noise reduction pipe 202, and are connected to both the first noise reduction pipe 201 and the second noise reduction pipe 202. The first partitions 203, the first noise reduction pipe 201, and the second noise reduction pipe 202 form the first noise reduction chamber 231, and the first noise reduction hole 221 is located within the first noise reduction pipe 201.

[0110] For example, the wall thickness of the first noise reduction pipe 201 is greater than or equal to 1 mm and less than or equal to 10 mm; or the wall thickness of the first noise reduction pipe 201 is greater than or equal to 1 mm and less than or equal to 5 mm; or the wall thickness of the first noise reduction pipe 201 is greater than or equal to 1 mm and less than or equal to 2 mm.

[0111] For example, the thickness of the first partition 203 is greater than or equal to 1 mm and less than or equal to 10 mm; or the thickness of the first partition 203 is greater than or equal to 1 mm and less than or equal to 5 mm; or the thickness of the first partition 203 is greater than or equal to 1 mm and less than or equal to 2 mm.

[0112] In the embodiments of this application, the cross-sectional shapes of the first noise reduction pipe 201 and the second noise reduction pipe 202 can be circular or rectangular, or any other irregular cross-sectional shape; and the cross-sectional shapes of the first noise reduction pipe 201 and the second noise reduction pipe 202 can be the same or different.

[0113] In the embodiments of this application, the first noise reduction pipe 201 and the second noise reduction pipe 202 can be directly or indirectly connected to the housing 10. For example, the first noise reduction pipe 201 is directly connected to the housing 10, and the second noise reduction pipe 202 is connected to the first noise reduction pipe 201, thus achieving an indirect connection between the second noise reduction pipe 202 and the housing 10; or the second noise reduction pipe 202 is directly connected to the housing 10, and the second noise reduction pipe 202 is connected to the first noise reduction pipe 201, thus achieving an indirect connection between the first noise reduction pipe 201 and the housing 10; or both the first noise reduction pipe 201 and the second noise reduction pipe 202 are directly connected to the housing 10.

[0114] In the embodiments of this application, the first noise reduction pipe 201 can be coaxially or non-coaxially disposed inside the second noise reduction pipe 202. Both are connected to the housing 10 of the energy storage device, and the inner cavity of the first noise reduction pipe 201 forms a noise reduction channel 21. The noisy hot airflow discharged from the air outlet of the housing 10 can directly enter the noise reduction channel 21.

[0115] Multiple first partitions 203 are evenly distributed in the annular gap between the first noise reduction pipe 201 and the second noise reduction pipe 202. The two ends of each first partition 203 are respectively sealed to the outer wall of the first noise reduction pipe 201 and the inner wall of the second noise reduction pipe 202. Thus, the adjacent first partitions 203, the outer wall of the first noise reduction pipe 201 and the inner wall of the second noise reduction pipe 202 together enclose and form independent first noise reduction chambers 231. The first noise reduction chambers 231 are arranged in a ring array.

[0116] The first noise reduction hole 221 is opened on the pipe wall of the first noise reduction pipe 201. One end of it is connected to the noise reduction channel 21, and the other end is connected to the corresponding first noise reduction chamber 231, thus realizing the sound wave transmission path between the noise reduction channel 21 and the first noise reduction chamber 231.

[0117] When the energy storage device is running, the noisy hot airflow enters the noise reduction channel 21 through the air outlet of the housing 10. The sound wave signal in the airflow can be transmitted into the first noise reduction chamber 231 through the first noise reduction hole 221, and the noise is attenuated by the resonance effect. The airflow after noise reduction is discharged along the noise reduction channel 21, realizing the simultaneous heat dissipation and noise reduction.

[0118] In the embodiments of this application, the first noise reduction pipe 201, the second noise reduction pipe 202 and the first partition 203 can be independent of each other, and the three can be connected by bolts, clips or welding, or the first noise reduction pipe 201, the second noise reduction pipe 202 and the first partition 203 can be integrally formed.

[0119] The first noise reduction duct 201 and the second noise reduction duct 202 adopt a nested layout. The noise reduction channel 21 is set in the inner cavity of the inner first noise reduction duct 201. At the same time, the gap between the inner and outer ducts is used to form the first noise reduction chamber 231 by the first partition 203. There is no need to occupy external space to set up the noise reduction chamber. Without increasing the overall volume of the noise reducer 20, it is more conducive to the compact integration of the noise reducer 20 and the housing 10.

[0120] Each first noise reduction chamber 231 is sealed and separated by a first partition 203, and is independent of each other, which can effectively avoid sound wave crosstalk between different noise reduction chambers and prevent attenuated noise from being superimposed again. At the same time, each first noise reduction chamber 231 is connected to the noise reduction channel 21 through a dedicated first noise reduction hole 221, which can selectively absorb noise in a specific frequency band and improve the targeted noise reduction effect on composite noise sources.

[0121] The sealed connection between the first partition 203 and the first noise reduction pipe 201 and the second noise reduction pipe 202 ensures that the first noise reduction chamber 231 forms a stable resonance space, providing a stable resonance noise reduction effect.

[0122] The first noise reduction chamber 231 is a modular structure formed by the first partition 203. In practical applications, the volume and number of the first noise reduction chamber 231 can be flexibly changed by adjusting the number, length, and arrangement angle of the first partition 203 to adapt to the noise reduction needs of different scenarios. During subsequent maintenance, only damaged partitions or local pipes need to be replaced, without disassembling the entire noise reduction unit, reducing maintenance difficulty and cost.

[0123] In some other embodiments of this application, the noise reduction device 20 may include a third noise reduction plate and a fourth noise reduction plate disposed opposite to each other, and a fifth noise reduction plate and a sixth noise reduction plate disposed opposite to each other. The fifth and sixth noise reduction plates are located between the third and fourth noise reduction plates, and the fifth noise reduction plate is connected to both the third and fourth noise reduction plates. The sixth noise reduction plate is also connected to both the third and fourth noise reduction plates. The third, fourth, fifth, and sixth noise reduction plates form a noise reduction channel 21. The noise reduction device 20 may also include a seventh and an eighth noise reduction plate disposed opposite to each other, and a third partition. The seventh noise reduction plate is located on the side of the fifth noise reduction plate away from the sixth noise reduction plate, and the eighth noise reduction plate is located on the side of the sixth noise reduction plate away from the fifth noise reduction plate. The seventh noise reduction plate is connected to both the third and fourth noise reduction plates, and the eighth noise reduction plate is also connected to both the third and fourth noise reduction plates. The third partition is located between the third and fourth noise-reducing plates, and is connected to both of them. A portion of the third partition is located between the seventh and fifth noise-reducing plates, and this portion is connected to both of them. The third partition, along with the third, fourth, seventh, and fifth noise-reducing plates, forms a partial first noise-reducing chamber 231. Another portion is located between the eighth and sixth noise-reducing plates, and this portion is connected to both of them. The third partition, along with the third, fourth, eighth, and sixth noise-reducing plates, forms a partial first noise-reducing chamber 231. The first noise-reducing hole 221 is located on either the fifth or sixth noise-reducing plate.

[0124] According to some embodiments of this application, Figure 9 A simplified cross-sectional schematic diagram of a first noise reduction hole provided in an embodiment of this application is shown below. Figure 9 The noise reduction device 20 also includes a first regulating tube 204, which is connected to the first noise reduction pipe 201. A part of the first regulating tube 204 is located inside the first noise reduction hole 221, and the other part of the first regulating tube 204 is located inside the first noise reduction chamber 231.

[0125] The first regulating tube 204 is a hollow tubular structure, and its material can be adapted to the first noise reduction tube 201. For example, the material of the first regulating tube 204 can be metal or plastic.

[0126] The length of the path that the airflow travels from leaving the noise reduction channel 21 until it fully enters the noise reduction chamber 23 is the length of the first regulating pipe 204, which can be understood as the length of the first regulating pipe 204 being the effective depth of the noise reduction hole 22.

[0127] The first regulating pipe 204 and the first noise reduction pipe 201 can be fixedly connected or detachably sealed, for example, the first regulating pipe 204 and the first noise reduction pipe 201 can be threaded, snap-fit ​​sealed, or bonded. The axial direction of the first regulating pipe 204 is collinear with the axis of the first noise reduction hole 221. A part of it is embedded in the hole along the extension direction of the first noise reduction hole 221 and fits tightly against the hole wall of the first noise reduction hole 221; the other part extends into the first noise reduction chamber 231, and the extension length can be preset or adjusted according to the actual noise reduction requirements.

[0128] The length of the first regulating tube 204 can be flexibly designed according to the target noise reduction frequency band and the volume of the first noise reduction chamber 231. When the noisy airflow flows through the noise reduction channel 21, the sound wave passes through the first noise reduction hole 221 and the first regulating tube 204 in sequence and enters the first noise reduction chamber 231. During the conduction process in the first regulating tube 204, the initial sound wave shaping and energy attenuation are completed, and then the sound wave enters the first noise reduction chamber 231 to achieve deep noise reduction through the resonance effect.

[0129] For the matching scenarios of multiple first noise reduction holes 221 and first noise reduction chambers 231, first adjustment tubes 204 of different lengths and inner diameters can be configured for the corresponding first noise reduction holes 221 according to the volume specifications and target noise reduction frequency band of each first noise reduction chamber 231, forming a differentiated sound wave transmission path design, and further optimizing the noise reduction effect across the entire frequency band.

[0130] The length of the first regulating tube 204 determines the propagation path and resonant frequency of the sound wave within the tube, and its inner diameter can be matched to the sound wave conduction requirements of different wavelengths. By adjusting the length and inner diameter of the first regulating tube 204, the conduction and attenuation characteristics of different frequency bands of noise, such as low-frequency fan noise and high-frequency electromagnetic noise, can be adapted: for low-frequency long-wavelength noise, a longer first regulating tube 204 with a larger inner diameter can be configured to extend the sound wave propagation path and reduce the conduction resistance, thereby increasing the sound wave energy density entering the large-volume first noise reduction chamber 231 and enhancing the resonance noise reduction effect; for high-frequency short-wavelength noise, a shorter first regulating tube 204 with a smaller inner diameter can be selected to optimize the sound wave conduction efficiency, and in conjunction with the small-volume first noise reduction chamber 231, achieve efficient absorption, thus broadening the effective noise reduction frequency band of the noise reducer.

[0131] The first regulating pipe 204 can be detachably connected to the first noise reduction pipe 201. This allows for adjustments to the noise reduction effect without modifying the core structures such as the first noise reduction pipe 201 and the first noise reduction chamber 231, simply by replacing the first regulating pipe 204 with different specifications (length, inner diameter). For example, to meet the stringent requirements of residential communities for low- and mid-frequency noise, a longer first regulating pipe 204 can be used to enhance low-frequency noise reduction; to meet the requirements of industrial parks for controlling high-frequency electromagnetic noise, a shorter regulating pipe can be used to optimize high-frequency absorption, thus improving the product's adaptability to different scenarios and its market competitiveness.

[0132] According to some embodiments of this application, the noise reduction device 20 includes a plurality of first adjustment tubes 204, each first adjustment tube 204 corresponding to at most one first noise reduction hole 221, and at least two of the plurality of first adjustment tubes 204 have different lengths.

[0133] At least two of the multiple first regulating tubes 204 have different lengths, and the length difference can be set according to the volume specifications and target noise reduction frequency band of each first noise reduction chamber 231. For example, the first regulating tube 204 corresponding to the large volume first noise reduction chamber 231 can be set to a longer specification, and the first regulating tube 204 corresponding to the small volume first noise reduction chamber 231 can be set to a shorter specification; the first noise reduction chamber 231 of the same specification and volume can also be equipped with first regulating tubes 204 of different lengths to broaden the effective noise reduction frequency band of the noise reduction chamber.

[0134] For example, the lengths of the multiple first regulating tubes 204 can be divided into two specifications: some of the first regulating tubes 204 have the same length, while the rest have a uniform length; or, depending on the requirements, the lengths of the first regulating tubes 204 can be set to 3, 5, 10, 50, 100, or even more specifications. Alternatively, any two of the multiple first regulating tubes 204 may have different lengths.

[0135] The resonant frequency of a sound wave is related to the length of its propagation path. Different lengths of the first regulating tube 204 can form differentiated sound wave conduction and attenuation paths, matching the multi-band characteristics of the composite noise source in the energy storage device 200. A longer first regulating tube 204 can extend the propagation path of mid-to-low frequency long-wavelength noise, utilizing the sound wave reflection interference effect within the tube to consume a large amount of energy. Combined with the resonant absorption of the large-volume first noise reduction chamber 231, this improves the attenuation efficiency of mid-to-low frequency noise. A shorter first regulating tube 204, on the other hand, is adapted to the conduction requirements of high-frequency short-wavelength noise, reducing sound wave energy loss and ensuring that high-frequency noise is absorbed when it enters the small-volume first noise reduction chamber 231.

[0136] The combination of multiple first regulating tubes 204 of different lengths achieves noise reduction across the entire frequency range from high frequency to mid-low frequency, improving the noise reduction effect and making it easier for the noise emission of the energy storage device 200 to meet the environmental protection standards of densely populated areas such as residential communities and commercial parks.

[0137] According to some embodiments of this application, see Figure 6 and Figure 7 The multiple noise reduction chambers 23 also include a second noise reduction chamber 232, and the multiple noise reduction holes 22 also include a second noise reduction hole 222, combined with Figures 4 to 7 The noise reduction device 20 also includes a noise reduction element 205, which is located in the noise reduction channel 21 and is connected to the first noise reduction pipe 201. The multiple parts of the noise reduction channel 21 divided by the noise reduction element 205 are all connected to the air outlet.

[0138] Figure 10 This is a top view of a noise reduction element provided in an embodiment of this application. Figure 11 for Figure 10 A schematic diagram of the cross-section of plane AA. See also Figure 10 and Figure 11 The second noise reduction chamber 232 and the second noise reduction hole 222 are both located on the noise reduction element 205, combined with Figures 4 to 7 ,as well as Figure 10 and Figure 11 Each of the second noise reduction chambers 232 is connected to the noise reduction channel 21 through the second noise reduction hole 222, and each second noise reduction chamber 232 is connected to at least one second noise reduction hole 222.

[0139] See Figure 4 and Figure 5 The noise reduction element 205 is arranged along the extension direction (first direction X) of the noise reduction channel 21, dividing the originally continuous noise reduction channel 21 into multiple parallel sub-channels. One end of each sub-channel is connected to the air outlet of the energy storage device box 10, and the other end of each sub-channel is connected to the outside, ensuring that the noisy hot air can be smoothly discharged through any sub-channel without affecting the overall heat dissipation efficiency of the energy storage device. The cross-sectional shape of each sub-channel after division is not limited.

[0140] The second noise reduction chamber 232 and the second noise reduction hole 222 are both integrated into the main body structure of the noise reduction element 205, forming the core noise reduction unit of the noise reduction element. The second noise reduction chamber 232 is an independent cavity opened inside the noise reduction element 205, which can be arranged in an array, honeycomb or distributed manner. Each second noise reduction chamber 232 is isolated from each other to avoid sound wave crosstalk in different cavities. The second noise reduction hole 222 is a through hole opened on the surface of the noise reduction element 205 facing the noise reduction channel 21, and its diameter is set according to the target noise reduction frequency band.

[0141] Each second noise reduction chamber 232 is connected to at least one second noise reduction hole 222. One end of the second noise reduction hole 222 is connected to the noise reduction channel 21, and the other end is connected to the internal cavity of the corresponding second noise reduction chamber 232. The volume specifications of the second noise reduction chamber 232 can be flexibly designed according to the overall size of the noise reduction element 205, and can be set to uniform specifications or differentiated specifications. The distribution density and aperture size of the second noise reduction holes 222 can be adapted to the layout of the second noise reduction chamber 232, so that the sound waves in each sub-channel can enter the second noise reduction chamber 232 through the corresponding second noise reduction hole 222.

[0142] When the energy storage device 200 is running, the noisy hot airflow enters the noise reduction channel 21 through the air outlet of the housing 10. It is first divided into multiple airflows by the noise reduction element 205, which then flow through various sub-channels. During this process, the sound waves in the airflow achieve noise reduction through two paths: firstly, some sound waves pass through the first noise reduction hole 221 and enter the first noise reduction chamber 231, where they are attenuated through resonance; secondly, another portion of the sound waves pass through the second noise reduction hole 222 on the inner wall of the sub-channel and enter the second noise reduction chamber 232, where they are attenuated through both cavity resonance and material adsorption. Finally, the airflow, after undergoing dual noise reduction treatment, merges along the sub-channels and is discharged, achieving a synergistic effect of heat dissipation and noise reduction.

[0143] The noise reduction element 205 integrates the second noise reduction chamber 232 and the second noise reduction hole 222 within the noise reduction channel 21, making full use of the unused space within the channel. This allows for the addition of a noise reduction unit without requiring additional external volume, improving the space utilization of the noise reducer 20 compared to a separate noise reduction module design. Simultaneously, the segmented design of the noise reduction channel 21 by the noise reduction element 205 shortens the contact distance between the sound wave and the second noise reduction hole 222 without affecting airflow, thus improving the efficiency of sound waves entering the second noise reduction chamber 232.

[0144] According to some embodiments of this application, see Figure 11 The noise reduction element 205 includes a first noise reduction plate 251 and a second noise reduction plate 252. Figure 12 This is a partial structural schematic diagram of a noise reduction element provided in an embodiment of this application. Figure 13 for Figure 12 A magnified view of point B in the middle. (Combined with...) Figures 11 to 13 The noise reduction element 205 also includes multiple second partitions 253. Combined with... Figures 4 to 7 ,as well as Figures 11 to 13The first noise reduction plate 251 is connected to the first noise reduction pipe 201, the second noise reduction plate 252 is opposite to the first noise reduction plate 251, and multiple second partitions 253 are located between the first noise reduction plate 251 and the second noise reduction plate 252. The second partitions 253 are connected to both the first noise reduction plate 251 and the second noise reduction plate 252. The second partitions 253, the first noise reduction plate 251 and the second noise reduction plate 252 form a second noise reduction chamber 232, and the second noise reduction hole 222 is located in one of the first noise reduction plate 251 and the second noise reduction plate 252.

[0145] For example, the thickness of the first noise reduction board 251 is greater than or equal to 1 mm and less than or equal to 10 mm; or the thickness of the first noise reduction board 251 is greater than or equal to 1 mm and less than or equal to 5 mm; or the thickness of the first noise reduction board 251 is greater than or equal to 1 mm and less than or equal to 2 mm.

[0146] For example, the thickness of the second noise reduction board 252 is greater than or equal to 1 mm and less than or equal to 10 mm; or the thickness of the second noise reduction board 252 is greater than or equal to 1 mm and less than or equal to 5 mm; or the thickness of the second noise reduction board 252 is greater than or equal to 1 mm and less than or equal to 2 mm.

[0147] For example, the thickness of the second partition 253 is greater than or equal to 1 mm and less than or equal to 10 mm; or the thickness of the second partition 253 is greater than or equal to 1 mm and less than or equal to 5 mm; or the thickness of the second partition 253 is greater than or equal to 1 mm and less than or equal to 2 mm.

[0148] Multiple second partitions 253 are strip-shaped or plate-shaped structures, made of the same material as the first noise reduction plate 251 and the second noise reduction plate 252. Their length is adapted to the spacing between the first noise reduction plate 251 and the second noise reduction plate 252, and their width is set according to the number and layout requirements of the second noise reduction chambers 232. The first noise reduction plate 251 and the second noise reduction plate 252 can be arranged in parallel, and the second partitions 253 can be arranged vertically between the first noise reduction plate 251 and the second noise reduction plate 252. The two ends of each second partition 253 are fixedly connected to the surface of the first noise reduction plate 251 and the surface of the second noise reduction plate 252 respectively (such as by welding, gluing, bolting, or slot splicing). The connection parts are ensured to be sealed without gaps to avoid sound wave crosstalk and airflow leakage.

[0149] Through the orderly arrangement of multiple second partitions 253 (such as parallel arrangement, cross arrangement, or array arrangement), the inner surfaces of the second partitions 253, the first noise reduction plate 251, and the second noise reduction plate 252 together enclose multiple independent second noise reduction chambers 232. The shape of each second noise reduction chamber 232 can be flexibly adjusted according to the arrangement method. For example, when arranged in parallel, it forms a cuboid cavity; when arranged in cross, it forms a rhomboid or polygonal cavity; and when arranged in an array, it forms a honeycomb cavity. Its volume specifications can be uniformly set or differentiated to adapt to the resonance absorption requirements of noise in different frequency bands.

[0150] The second noise reduction hole 222 is a through hole formed on the plate body, and its number, diameter and distribution position are matched with the layout of the second noise reduction chamber 232. Specifically, the second noise reduction hole 222 is formed only in one of the first noise reduction plate 251 and the second noise reduction plate 252: if it is formed in the first noise reduction plate 251, then the first noise reduction plate 251 serves as the "sound wave receiving surface" facing the sub-channel of the noise reduction channel 21, and the second noise reduction hole 222 penetrates through the thickness direction of the first noise reduction plate 251, with one end connected to the sub-channel and the other end connected to the corresponding second noise reduction chamber 232; if it is formed in the second noise reduction plate 252, then the second noise reduction plate 252 serves as the "sound wave receiving surface", and the second noise reduction hole 222 penetrates through the second noise reduction plate 252 and connects the sub-channel and the second noise reduction chamber 232.

[0151] The aperture of the second noise reduction hole 222 is set according to the target noise reduction frequency band, and the distribution density is such that each second noise reduction chamber 232 corresponds to at least one second noise reduction hole 222, and the hole position avoids the connection area of ​​the second partition 253 to avoid affecting the structural strength and sealing performance.

[0152] First, the first noise reduction plate 251 and the second noise reduction plate 252 are connected and fixed by the second partition 253 to form a modular unit with the second noise reduction hole 222; then, the unit is embedded into the noise reduction channel 21 and sealed to the inner wall of the first noise reduction pipe 201 by the outer edge of the first noise reduction plate 251 or the second noise reduction plate 252 to complete the installation.

[0153] During operation, the noisy hot airflow enters the noise reduction channel 21 and is divided into multiple sub-airflows by the noise reduction element 205. The sound waves in the sub-airflows pass through the second noise reduction holes 222 on the first noise reduction plate 251 or the second noise reduction plate 252 and are transmitted to the corresponding second noise reduction chamber 232. The noise is attenuated by utilizing the cavity resonance effect and the sound absorption characteristics of the plate and partition. At the same time, another part of the sound waves enters the first noise reduction chamber 231 through the first noise reduction hole 221 to achieve resonance noise reduction.

[0154] The second noise reduction chamber 232 is rigidly connected and enclosed by the first noise reduction plate 251, the second noise reduction plate 252 and the second partition 253. It has a simple structure, high structural strength and good stability. It can effectively resist the airflow impact and vibration during the operation of the energy storage device 200, avoid the resonant frequency shift caused by cavity deformation, and ensure the long-term stability of the noise reduction effect.

[0155] By adjusting the number, arrangement, and spacing of the second partitions 253, the volume, shape, and number of the second noise reduction chamber 232 can be flexibly changed: increasing the number of partitions and reducing the spacing can form a small-volume noise reduction chamber suitable for high-frequency noise; reducing the number of partitions and increasing the spacing can form a large-volume noise reduction chamber suitable for mid- and low-frequency noise; cross-arrangement or array arrangement can form a multi-specification hybrid cavity to achieve full-band coverage. At the same time, the aperture and distribution density of the second noise reduction holes 222 can be adjusted synchronously with the specifications of the noise reduction chamber, and in conjunction with the synergistic effect of the first noise reduction chamber 231, further broaden the effective noise reduction frequency band of the noise reducer and adapt to the complex characteristics of the composite noise source of the energy storage device.

[0156] It should be noted that, for ease of explanation, the first noise reduction plate 251, the second noise reduction plate 252, and the second partition plate 253 in the accompanying drawings of this application are all flat plate structures; in other embodiments, the first noise reduction plate 251, the second noise reduction plate 252, and the second partition plate 253 may also be configured as curved plate or folded plate structures. Furthermore, the structures of the first noise reduction plate 251, the second noise reduction plate 252, and the second partition plate 253 may be the same or different.

[0157] In other embodiments of this application, the noise reduction element 205 may include a third noise reduction conduit, a fourth noise reduction conduit, and a plurality of fourth partitions. Both the third and fourth noise reduction conduits are located within the noise reduction channel 21, with the third noise reduction conduit located within the fourth noise reduction conduit, and the fourth noise reduction conduit connected to the first noise reduction conduit 201. The plurality of fourth partitions are located between the third and fourth noise reduction conduits, and are connected to both the third and fourth noise reduction conduits. The fourth partitions, the third noise reduction conduit, and the fourth noise reduction conduit form a second noise reduction chamber, and the second noise reduction hole 222 is located in one of the third and fourth noise reduction conduits.

[0158] The cross-sectional shape of the third noise reduction pipe and the fourth noise reduction pipe can be circular, rectangular, other polygonal, or any irregular shape; and the cross-sectional shape of the third noise reduction pipe and the fourth noise reduction pipe can be the same or different.

[0159] Figure 14 A simplified cross-sectional schematic diagram of a second noise reduction hole provided in an embodiment of this application is shown below. Figure 14The noise reduction device 20 also includes a second adjustment tube 206, which is connected to one of the first noise reduction plate 251 and the second noise reduction plate 252. A part of the second adjustment tube 206 is located in the second noise reduction hole 222, and the other part of the second adjustment tube 206 is located in the second noise reduction chamber 232.

[0160] The connection point of the second regulating pipe 206 corresponds exactly to the location of the second noise reduction hole 222. That is, if the second noise reduction hole 222 is located on the first noise reduction plate 251, the second regulating pipe 206 and the first noise reduction plate 251 form a fixed connection or a detachable sealed connection; if the second noise reduction hole 222 is located on the second noise reduction plate 252, the second regulating pipe 206 and the second noise reduction plate 252 form a sealed connection. The connection method can be threaded connection, snap seal, adhesive fixation, or flange connection, etc. The connection part is reinforced with sealing rings, sealing gaskets and other components to ensure no airflow leakage and sound wave escape, while ensuring structural stability.

[0161] Part of the second regulating tube 206 is embedded inside the channel along the extension direction of the second noise reduction hole 222, and fits tightly against the hole wall of the second noise reduction hole 222 to ensure the sealing of the sound wave transmission path; the other part extends into the second noise reduction chamber 232. The extension length is precisely designed according to the volume specifications of the second noise reduction chamber 232 and the target noise reduction frequency band, and the extension end does not contact other inner walls of the second noise reduction chamber 232 to avoid affecting the sound wave resonance effect.

[0162] After the noisy hot airflow is diverted to the sub-channel through the noise reduction channel 21, the propagation and noise reduction path of the sound wave is further optimized: the sound wave first contacts the first noise reduction plate 251 or the second noise reduction plate 252 with the second noise reduction hole 222, and enters the corresponding second regulating pipe 206 through the second noise reduction hole 222; during the propagation in the pipe, the sound wave completes the initial energy attenuation and waveform shaping through the friction of the hole wall and reflection interference; subsequently, the sound wave enters the second noise reduction chamber 232 from the extension end of the second regulating pipe 206, and completes the deep noise reduction by utilizing the cavity resonance effect and the sound absorption characteristics of the plate and partition.

[0163] The length and inner diameter of the second regulating tube 206 directly affect the propagation path, resonant frequency, and energy attenuation efficiency of sound waves within the tube. Targeted design allows for precise adaptation to different noise bands. For a small-volume second noise reduction chamber 232 adapted to high-frequency noise, a shorter second regulating tube 206 with a smaller inner diameter can be configured to reduce energy loss during high-frequency sound wave transmission, ensuring efficient entry into the cavity for resonant absorption. For a large-volume second noise reduction chamber 232 adapted to mid-to-low-frequency noise, a longer second regulating tube 206 with a larger inner diameter can be used to extend the propagation path of mid-to-low-frequency sound waves. Reflection interference within the tube pre-consumes some energy, which, combined with cavity resonance, enhances the attenuation effect. This design overcomes the limitations of the fixed conduction characteristics of a single second noise reduction hole 222, further broadening the effective noise reduction frequency band of each second noise reduction chamber 232, making it more suitable for the complex characteristics of composite noise in energy storage devices.

[0164] The second regulating tube 206 adopts a modular design, which supports flexible adaptation with the noise reduction element 205: for the noise control needs of different application scenarios, there is no need to change the core structure of the noise reduction element. Only by replacing the second regulating tube 206 with different specifications (length, inner diameter) can the noise reduction frequency band of the second noise reduction chamber 232 be controlled.

[0165] According to some embodiments of this application, the noise reduction device 20 includes a plurality of second adjustment tubes 206, each second adjustment tube 206 corresponding to at most one second noise reduction hole 222, and at least two of the plurality of second adjustment tubes 206 have different lengths.

[0166] At least two of the multiple second regulating tubes 206 have different lengths, and the length difference can be set according to the volume specifications and target noise reduction frequency band of each second noise reduction chamber 232. For example, the second regulating tube 206 corresponding to the large volume second noise reduction chamber 232 can be set to a longer specification, and the second regulating tube 206 corresponding to the small volume second noise reduction chamber 232 can be set to a shorter specification; second noise reduction chambers 232 of the same specification and volume can also be equipped with second regulating tubes 206 of different lengths to broaden the effective noise reduction frequency band of the noise reduction chamber.

[0167] For example, the lengths of the multiple second regulating tubes 206 can be divided into two specifications: some of the second regulating tubes 206 have the same length, while the rest have a uniform length; or, depending on the requirements, the lengths of the second regulating tubes 206 can be set to 3, 5, 10, 50, 100, or even more specifications. Alternatively, any two of the multiple second regulating tubes 206 may have different lengths.

[0168] The combination of multiple second regulating tubes 206 of different lengths enables noise reduction across the entire frequency range from high frequency to mid-low frequency, improving the noise reduction effect and making it easier for the noise emission of the energy storage device 200 to meet the environmental protection standards of densely populated areas such as residential communities and commercial parks.

[0169] According to some embodiments of this application, see Figure 4 and Figure 5 The noise reduction device 20 includes multiple noise reduction elements 205, which are spaced apart from each other.

[0170] For example, multiple noise reduction elements 205 may be arranged at intervals along the second direction.

[0171] By deploying multiple noise reduction elements 205, the number of second noise reduction chambers 232 can be expanded, thereby configuring more second noise reduction chambers 232 with different volume specifications to effectively reduce multi-frequency noise and improve overall noise reduction performance.

[0172] According to some embodiments of this application, the noise reducer 20 further includes a sound-absorbing layer located at least in one of the noise reduction channel 21 and the noise reduction chamber 23.

[0173] For example, the sound-absorbing layer is located on the inner wall of the noise reduction channel 21, but avoids the noise reduction hole 22 to prevent the sound waves from entering the noise reduction chamber; or the sound-absorbing layer is located on the inner wall of the noise reduction chamber 23, but avoids the noise reduction hole 22; or both the inner wall of the noise reduction channel 21 and the inner wall of the noise reduction chamber 23 have sound-absorbing layers, but avoid the noise reduction hole 22.

[0174] The sound-absorbing layer can be made of porous ceramics, fiber cotton, etc.

[0175] By utilizing the porous and loose structural characteristics of the sound-absorbing layer, noise waves entering the noise reduction chamber 23 or noise reduction channel 21 can undergo multiple reflections and refractions within the pores, triggering fiber vibration. This converts the mechanical energy of the sound waves into heat energy for dissipation, thereby attenuating noise energy and improving the noise reduction effect.

[0176] This application provides an energy storage system, which includes a power conversion device and an energy storage device according to any of the above embodiments. The power conversion device is used to electrically connect the power generation device and the energy storage device.

[0177] The energy storage system provided in this application embodiment has improved noise reduction efficiency and reduced noise pollution generated during the operation of the energy storage system.

[0178] This application provides a charging network, which includes charging piles and the energy storage device or energy storage system described in the above embodiments. The energy storage device or energy storage system is used to provide power to the charging piles.

[0179] The charging network provided in this application embodiment has improved noise reduction efficiency and reduced noise pollution generated during the operation of the charging network.

[0180] An embodiment of this application provides an energy storage device 200, which includes a housing 10 and a noise reducer 20. The noise reducer 20 is connected to the housing 10, and the housing 10 has an air outlet. The noise reducer 20 has a noise reduction channel 21, a plurality of noise reduction holes 22, and a plurality of noise reduction chambers 23. The plurality of noise reduction chambers 23 are independent of each other. The noise reduction channel 21 extends along a first direction X. The plurality of noise reduction chambers 23 are located at least on one side of the noise reduction channel 21 along a second direction. The first direction X intersects with the second direction. The plurality of noise reduction chambers 23 are all connected to the noise reduction channel 21 through the noise reduction holes 22. Each noise reduction chamber 23 is connected to at least one noise reduction hole 22. The noise reduction channel 21 is connected to the air outlet.

[0181] At least two of the multiple noise reduction chambers 23 have different volumes. At least two of the multiple noise reduction holes 22 have different cross-sectional areas. At least two of the multiple noise reduction holes 22 have different depths.

[0182] Multiple noise reduction chambers 23 include a first noise reduction chamber 231, multiple noise reduction holes 22 include a first noise reduction hole 221, and a noise reduction device 20 includes a first noise reduction pipe 201, a second noise reduction pipe 202, and multiple first partitions 203. Both the first noise reduction pipe 201 and the second noise reduction pipe 202 are connected to the housing 10. A noise reduction channel 21 is located within the first noise reduction pipe 201, and the first noise reduction pipe 201 is located within the second noise reduction pipe 202. Multiple first partitions 203 are located between the first noise reduction pipe 201 and the second noise reduction pipe 202, and are connected to both the first noise reduction pipe 201 and the second noise reduction pipe 202. The first partitions 203, the first noise reduction pipe 201, and the second noise reduction pipe 202 form a first noise reduction chamber 231, and a first noise reduction hole 221 is located within the first noise reduction pipe 201. The noise reduction device 20 also includes a first regulating tube 204, which is connected to the first noise reduction conduit 201. A portion of the first regulating tube 204 is located inside the first noise reduction hole 221, and another portion of the first regulating tube 204 is located inside the first noise reduction chamber 231. The noise reduction device 20 includes a plurality of first regulating tubes 204, each first regulating tube 204 corresponding to at most one first noise reduction hole 221, and at least two of the plurality of first regulating tubes 204 have different lengths.

[0183] The multiple noise reduction chambers 23 also include a second noise reduction chamber 232, the multiple noise reduction holes 22 also include a second noise reduction hole 222, the noise reducer 20 also includes a noise reduction element 205, the noise reduction element 205 is located in the noise reduction channel 21, the noise reduction element 205 is connected to the first noise reduction pipe 201, the multiple parts of the noise reduction channel 21 divided by the noise reduction element 205 are all connected to the air outlet, the second noise reduction chamber 232 and the second noise reduction hole 222 are both located in the noise reduction element 205, the second noise reduction chamber 232 is connected to the noise reduction channel 21 through the second noise reduction hole 222, and one second noise reduction chamber 232 is connected to at least one second noise reduction hole 222. The noise reduction element 205 includes a first noise reduction plate 251, a second noise reduction plate 252, and a plurality of second partitions 253. The first noise reduction plate 251 is connected to a first noise reduction conduit 201. The second noise reduction plate 252 is opposite to the first noise reduction plate 251. The plurality of second partitions 253 are all located between the first noise reduction plate 251 and the second noise reduction plate 252, and are connected to both the first noise reduction plate 251 and the second noise reduction plate 252. The second partitions 253, the first noise reduction plate 251, and the second noise reduction plate 252 form a second noise reduction chamber 232. A second noise reduction hole 222 is located in one of the first noise reduction plate 251 and the second noise reduction plate 252. The noise reducer 20 also includes a second adjusting tube 206, which is connected to one of the first noise reduction plate 251 and the second noise reduction plate 252. A portion of the second adjusting tube 206 is located inside the second noise reduction hole 222, and another portion of the second adjusting tube 206 is located inside the second noise reduction chamber 232. The noise reduction device 20 includes a plurality of second adjustment tubes 206, each second adjustment tube 206 corresponding to at most one second noise reduction hole 222, and at least two of the plurality of second adjustment tubes 206 have different lengths. The noise reduction device 20 includes a plurality of noise reduction elements 205, which are spaced apart from each other.

[0184] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An energy storage device, characterized by, The energy storage device includes: The enclosure has an air outlet; A noise reduction device is connected to the housing. The noise reduction device has a noise reduction channel, multiple noise reduction holes, and multiple noise reduction chambers. The multiple noise reduction chambers are independent of each other. The noise reduction channel extends along a first direction. The multiple noise reduction chambers are located at least on one side of the noise reduction channel along a second direction. The first direction intersects the second direction. The multiple noise reduction chambers are all connected to the noise reduction channel through the noise reduction holes. Each noise reduction chamber is connected to at least one noise reduction hole. The noise reduction channel is connected to the air outlet.

2. The energy storage device of claim 1, wherein, At least two of the noise reduction chambers have different volumes.

3. The energy storage device of claim 1, wherein, At least two of the noise reduction holes have different cross-sectional areas.

4. The energy storage device of claim 1, wherein, At least two of the noise reduction holes have different depths.

5. The energy storage device of any one of claims 1-4, wherein, The plurality of noise reduction chambers include a first noise reduction chamber, the plurality of noise reduction holes include a first noise reduction hole, and the noise reduction device includes: A first noise reduction conduit is connected to the housing, and the noise reduction channel is located in the first noise reduction conduit; The second noise reduction duct is connected to the housing, and the first noise reduction duct is located inside the second noise reduction duct; Multiple first partitions are located between the first noise reduction pipe and the second noise reduction pipe. The first partitions are connected to both the first noise reduction pipe and the second noise reduction pipe. The first partitions, the first noise reduction pipe, and the second noise reduction pipe form the first noise reduction chamber. The first noise reduction hole is located in the first noise reduction pipe.

6. The energy storage device of claim 5, wherein, The noise reduction device also includes: A first regulating pipe is connected to the first noise reduction pipe. A portion of the first regulating pipe is located inside the first noise reduction hole, and the other portion of the first regulating pipe is located inside the first noise reduction chamber.

7. The energy storage device of claim 6, wherein, The noise reduction device includes a plurality of first adjustment tubes, each first adjustment tube corresponding to at most one first noise reduction hole, and at least two of the plurality of first adjustment tubes have different lengths.

8. The energy storage device of claim 5, wherein, The plurality of noise reduction chambers further include a second noise reduction chamber, the plurality of noise reduction holes further include a second noise reduction hole, and the noise reduction device further includes: A noise reduction element is located in the noise reduction channel. The noise reduction element is connected to the first noise reduction pipe. The multiple parts of the noise reduction channel divided by the noise reduction element are all connected to the air outlet. The second noise reduction chamber and the second noise reduction hole are both located in the noise reduction element. The second noise reduction chamber is connected to the noise reduction channel through the second noise reduction hole. Each second noise reduction chamber is connected to at least one second noise reduction hole.

9. The energy storage device of claim 8, wherein, The noise reduction element includes: The first noise reduction board is connected to the first noise reduction pipe; The second noise reduction plate is opposite to the first noise reduction plate; Multiple second partitions are located between the first noise reduction plate and the second noise reduction plate. The second partitions are connected to both the first and second noise reduction plates. The second partitions, the first noise reduction plate, and the second noise reduction plate form the second noise reduction chamber. The second noise reduction hole is located in one of the first and second noise reduction plates.

10. The energy storage device of claim 9, wherein, The noise reduction device also includes: The second regulating tube is connected to one of the first noise reduction plate and the second noise reduction plate. A portion of the second regulating tube is located inside the second noise reduction hole, and the other portion of the second regulating tube is located inside the second noise reduction chamber.

11. The energy storage device of claim 10, wherein, The noise reduction device includes a plurality of second adjustment tubes, each second adjustment tube corresponding to at most one second noise reduction hole, and at least two of the plurality of second adjustment tubes have different lengths.

12. The energy storage device of any one of claims 8-11, wherein, The noise reduction device includes a plurality of noise reduction elements, which are spaced apart from each other.

13. The energy storage device of any one of claims 1-4, wherein, The noise reduction device also includes: A sound-absorbing layer is located in at least one of the noise reduction channel and the noise reduction chamber.

14. An energy storage system, characterized in that, It includes a power conversion device and an energy storage device as described in any one of claims 1 to 13, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

15. A charging network characterized in that, It includes a charging pile and an energy storage device as described in any one of claims 1 to 13 or an energy storage system as described in claim 14, wherein the energy storage device or the energy storage system is used to provide electrical energy to the charging pile.

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