Energy storage device and energy storage system

Abstract

Some embodiments of the present application provide an energy storage device and an energy storage system, the energy storage device comprises a box body and a battery device, the box body comprises a top wall and a side wall connected to the top wall and forms a cavity, the battery device is arranged in the cavity, the surface of the top wall away from the cavity is provided with a first protective coating comprising a first radiation refrigeration coating, and the surface of the top wall away from the cavity is provided with a second protective coating comprising a second radiation refrigeration coating. And a second protective coating comprising a second radiation refrigeration coating is arranged on the surface, deviating from the cavity, of the side wall. According to the structure, the first protective coating comprising the first radiation refrigeration coating is arranged on the top wall of the box body, and the second protective coating comprising the second radiation refrigeration coating is arranged on the side wall of the box body, so that when sunlight outside the box body irradiates the top wall and the side wall of the box body, the radiation refrigeration coating can be prevented from being damaged. When the energy storage device is cooled, heat can be reflected out by the first radiation refrigeration coating and the second radiation refrigeration coating, the temperature of the energy storage device is not prone to rising, energy loss generated by cooling of the energy storage device can be reduced, and energy consumption of the energy storage device can be reduced.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to an energy storage device and energy storage system. Background Technology

[0002] Battery devices have advantages such as high specific energy and high power density, and are widely used in energy storage devices such as energy storage containers or energy storage cabinets. Energy storage devices 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.

[0003] Due to their advantages such as large capacity and high degree of integration, energy storage devices are being used in an increasingly wide range of applications. How to reduce the energy consumption of these devices themselves is receiving increasing attention from those skilled in the art. Utility Model Content

[0004] In view of the above problems, this application provides an energy storage device and an energy storage system, wherein the energy storage device has low energy consumption.

[0005] In a first aspect, some embodiments of this application provide an energy storage device, which includes a housing and a battery device. The housing forms a cavity and includes a top wall and a side wall connected to the top wall. The battery device is disposed in the cavity. A first protective coating is provided on the surface of the top wall away from the cavity, and a second protective coating is provided on the surface of the side wall away from the cavity. The first protective coating includes a first radiation cooling coating, and the second protective coating includes a second radiation cooling coating.

[0006] In the above structure, since the top wall of the box is provided with a first protective coating including a first radiative cooling coating and the side wall is provided with a second protective coating including a second radiative cooling coating, when sunlight shines on the top wall and side wall of the box, the heat can be effectively reflected away by the first and second radiative cooling coatings, which is less likely to cause the temperature of the energy storage device to rise. This reduces the energy loss of the energy storage device for cooling and helps to reduce the energy consumption of the energy storage device.

[0007] According to some embodiments of the present application, the energy storage device has a first radiative cooling coating disposed on the surface of the top wall. The first protective coating also includes a first anti-corrosion coating. The first anti-corrosion coating is disposed on the outside of the first radiative cooling coating away from the cavity, so that the first anti-corrosion coating can isolate the first radiative cooling coating from the external environment, reducing the possibility of corrosion of the first radiative cooling coating due to factors such as rainwater and oxygen in the external environment, and helping to extend the service life of the first radiative cooling coating.

[0008] According to some embodiments of the energy storage device provided in this application, the first protective coating further includes a first anti-corrosion coating, which is disposed on the surface of the top wall, and a first radiative cooling coating is disposed on the outer side of the first anti-corrosion coating away from the cavity. Since the first anti-corrosion coating directly covers the outer surface of the top wall away from the cavity, the possibility of the outer surface of the top wall away from the cavity coming into contact with other substances is reduced, which is beneficial to improving the anti-corrosion effect of the first protective coating on the top wall.

[0009] According to some embodiments of the present application, the energy storage device provides a second radiative cooling coating on the surface of the side wall. The second protective coating also includes a second anti-corrosion coating. The second anti-corrosion coating is disposed on the outside of the second radiative cooling coating away from the cavity, so that the second anti-corrosion coating can isolate the first radiative cooling coating from the external environment, reducing the possibility of corrosion of the second radiative cooling coating due to factors such as rainwater and oxygen in the external environment, and helping to extend the service life of the second radiative cooling coating.

[0010] According to some embodiments of the energy storage device provided in this application, the second protective coating further includes a second anti-corrosion coating, which is disposed on the surface of the sidewall, and the second radiative cooling coating is disposed on the outer side of the second anti-corrosion coating away from the cavity. Since the second anti-corrosion coating directly covers the outer surface of the top wall away from the cavity, the possibility of the outer surface of the top wall away from the cavity coming into contact with other substances is reduced, which is beneficial to improving the anti-corrosion effect of the second protective coating on the top wall.

[0011] According to some embodiments of the energy storage device provided in this application, the second protective coating includes an upper region and a lower region connected to each other, wherein the thickness of the second anti-corrosion coating in the lower region is greater than the thickness of the second anti-corrosion coating in the upper region. By setting the thickness of the second anti-corrosion coating in the lower region to be greater than the thickness of the second anti-corrosion coating in the upper region, the corrosion resistance of the lower region is stronger than that of the upper region.

[0012] According to some embodiments of the present application, the thickness of the second radiation cooling coating in the lower region is less than the thickness of the second radiation cooling coating in the upper region. This is beneficial because the thickness of the second radiation cooling coating in the lower region plus the thickness of the second anti-corrosion coating is equal to the thickness of the second radiation cooling coating in the upper region plus the thickness of the second anti-corrosion coating. This is also beneficial because the thickness of the upper region is equal to the thickness of the lower region. This ensures that the overall thickness of the second protective coating on the sidewall remains consistent and that the surface of the energy storage device is smooth.

[0013] According to some embodiments of the present application, the energy storage device has a height of G in the lower region along the vertical direction, where 0.3m≤G≤0.7m. This not only ensures that the lower region has sufficient height to protect the lower part of the sidewall, but also prevents the lower region from having too high a height, which could affect the heat reflection capability of the second protective coating.

[0014] According to some embodiments of the energy storage device provided in this application, the thickness of the second radiation cooling coating in the upper region is set to H3, 200μm≤H3≤600μm; the thickness of the second anti-corrosion coating in the upper region is set to H4, 100μm≤H4≤400μm; the thickness of the second radiation cooling coating in the lower region is set to H5, 50μm≤H5≤350μm; and the thickness of the second anti-corrosion coating in the lower region is set to H6, 300μm≤H6≤600μm.

[0015] According to some embodiments of the energy storage device provided in this application, the thickness of the first radiative cooling coating is greater than that of the second radiative cooling coating. By setting the thickness of the first radiative cooling coating to be greater than that of the second radiative cooling coating, the heat reflection capability of the first protective coating is greater than that of the second protective coating. Since the first protective coating is disposed on the outer surface of the top wall located at the top of the housing, the first protective coating can better reflect the heat of the top wall that receives more sunlight, which is beneficial for better reflecting the heat received by the energy storage device away.

[0016] According to some embodiments of the energy storage device provided in this application, the thickness of the first radiative cooling coating is set to H1, 400μm≤H1≤900μm. This not only ensures that the first radiative cooling coating has sufficient thickness to reflect the heat received by the top wall from the first protective coating, but also prevents the first radiative cooling coating from wasting material due to excessive thickness. The thickness of the first anti-corrosion coating is set to H2, 300μm≤H2≤600μm. This not only ensures that the first anti-corrosion coating has sufficient thickness to provide the first protective coating with good anti-corrosion ability, but also prevents the first anti-corrosion coating from wasting material due to excessive thickness.

[0017] According to some embodiments of the present application, the energy storage device has 500μm≤H1≤800μm and 400μm≤H2≤500μm.

[0018] Secondly, some embodiments of this application provide an energy storage system, which includes a power conversion device and at least one energy storage device as provided by any of the above technical solutions, wherein the power conversion device is used to electrically connect a power generation device and at least one energy storage device.

[0019] The technical solutions provided by the embodiments of this disclosure have at least the following beneficial effects:

[0020] Some embodiments of this application provide an energy storage device, which includes a housing and a battery device. The housing includes a top wall and a side wall connected to the top wall, forming a cavity. The battery device is disposed in the cavity. The surface of the top wall facing away from the cavity is provided with a first protective coating including a first radiation cooling coating, and the surface of the side wall facing away from the cavity is provided with a second protective coating including a second radiation cooling coating. In the above structure, because the top wall of the housing is provided with a first protective coating including a first radiation cooling coating, and the side wall is provided with a second protective coating including a second radiation cooling coating, when sunlight shines on the top wall and side wall of the housing from outside, the heat is reflected away by the first and second radiation cooling coatings, making it less likely for the temperature of the energy storage device to rise. This reduces the energy loss generated by the energy storage device for cooling, which is beneficial for reducing the energy consumption of the energy storage device.

[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, the following are specific embodiments of this application. Attached Figure Description

[0022] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings.

[0023] Figure 1 This is a schematic diagram of the internal structure of an energy storage device provided in some embodiments of this application;

[0024] Figure 2 This is an external schematic diagram of an energy storage device provided in some embodiments of this application;

[0025] Figure 3 For some embodiments of this application Figure 1 Schematic diagram of the structure at point A;

[0026] Figure 4 For other embodiments of this application Figure 1 Schematic diagram of the structure at point A;

[0027] Figure 5 In some embodiments of this application Figure 1 Schematic diagram of the structure at point A;

[0028] Figure 6 For some embodiments of this application Figure 1 A schematic diagram of the structure at point B.

[0029] In the attached image:

[0030] 1. Enclosure; 11. Top wall; 111. First protective coating; 1111. First anti-corrosion coating; 1112. First radiative cooling coating; 12. Side wall; 121. Second protective coating; 1211. Second anti-corrosion coating; 1212. Second radiative cooling coating; 1213. Upper area; 1214. Lower area;

[0031] 10. Cavity; 2. Battery device; Z, Vertical direction. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application 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 description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0034] In this application, the reference to "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 in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0036] 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, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0037] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0038] In the embodiments of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. For example, if the angle between two directions is 85°-9°, the two directions can be considered perpendicular; if the angle between two directions is 5°-5°, the two directions can be considered parallel.

[0039] In this application, "multiple" means two or more (including two).

[0040] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in energy storage devices such as energy storage containers or energy storage cabinets. As the application fields of battery devices continue to expand, the demand for lower energy consumption from these devices is constantly increasing.

[0041] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0042] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0043] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0044] In some embodiments, the battery device may include one or more battery packs, which may include one or more individual battery cells. As an example, a battery pack includes a housing and one or more individual battery cells, which are housed within the housing, for example, by a fixed arrangement. As yet another example, the battery device may include multiple battery packs, which may be connected in series, parallel, or in a mixed configuration.

[0045] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0046] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0047] In some embodiments, the battery device includes multiple battery packs that can constitute one or more battery clusters. Therefore, the energy storage device provided in this application includes one or more battery clusters to improve the voltage and capacity of the energy storage device. A battery cluster may include multiple battery packs, which are connected in series via a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters can be connected in series, parallel, or in a mixed configuration.

[0048] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, an energy storage device 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 embodiment can be any power system that requires energy storage devices.

[0049] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0050] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters housed within the cabinet.

[0051] In some embodiments, the energy storage device 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.

[0052] 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.

[0053] 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.

[0054] As an example, the central control module can serve as the battery management unit for an energy storage device, used to monitor and manage the device. The central control module can monitor information such as the energy storage device's current, voltage, power, state of charge, or temperature. For instance, it can control the charging and discharging current and voltage of the energy storage device. 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.

[0055] 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.

[0056] As an example, the power distribution unit can be used to distribute power to the power modules of the energy storage device.

[0057] Currently, energy storage devices used for storing electrical energy are typically installed outdoors, where they are affected by external environmental factors such as sunlight, high temperatures, and low temperatures during operation. In extreme regions such as deserts and offshore, the impact of the external environment on the temperature of energy storage devices is particularly significant. Since the normal operation of energy storage devices requires a suitable temperature, when the internal temperature of the energy storage device rises due to sunlight exposure, the thermal management module in the energy storage device needs to increase energy consumption to maintain the internal temperature, resulting in a relatively high energy consumption for the energy storage device itself.

[0058] To reduce the energy consumption of energy storage devices, some embodiments of this application provide an energy storage device including a housing and a battery unit. The housing includes a top wall and a side wall connected to the top wall, forming a cavity. The battery unit is disposed in the cavity. The surface of the top wall facing away from the cavity is provided with a first protective coating including a first radiation cooling coating, and the surface of the side wall facing away from the cavity is provided with a second protective coating including a second radiation cooling coating. In the above structure, because the top wall of the housing is provided with a first protective coating including a first radiation cooling coating, and the side wall is provided with a second protective coating including a second radiation cooling coating, when sunlight shines on the top wall and side wall of the housing from outside, the heat is reflected away by the first and second radiation cooling coatings, making it less likely for the temperature of the energy storage device to rise. This reduces the energy loss generated by the energy storage device for cooling, which is beneficial to reducing the energy consumption of the energy storage device.

[0059] The energy storage device described in this application can be an energy storage container or an energy storage cabinet, and it can be applied to an energy storage system. The energy storage system can include one or more energy storage devices and a power conversion system (PCS). The power conversion system is used to connect the power generation equipment and the energy storage device. The power generation equipment generates electrical energy, which can be stored in the energy storage device through the power conversion system. For example, the power generation equipment can specifically be a solar panel, hydroelectric power generation equipment, thermal power generation equipment, wind power generation equipment, etc.

[0060] Some embodiments of this application provide an energy storage device, such as... Figure 1 and Figure 2 As shown, the energy storage device includes a housing 1 and a battery device 2. The housing 1 forms a cavity 10 and includes a top wall 11 and a side wall 12 connected to the top wall 11. The battery device 2 is disposed in the cavity 10. The surface of the top wall 11 facing away from the cavity 10 is provided with a first protective coating 111, and the surface of the side wall 12 facing away from the cavity 10 is provided with a second protective coating 121. The first protective coating 111 includes a first radiation cooling coating 1112, and the second protective coating 121 includes a second radiation cooling coating 1212.

[0061] The housing 1 can be a housing structure that can form a hollow structure in the energy storage device. The hollow structure can serve as a cavity 10 to accommodate the battery device 2 in the energy storage device. The battery device 2 is disposed in the cavity 10 and can be protected by the housing 1.

[0062] Both the top wall 11 and the side walls 12 are wall structures within the housing 1, used to enclose the cavity 10 within the housing 1. The top wall 11 can be the wall structure located at the highest point in the vertical direction Z within the housing 1. The side walls 12 can be wall structures on the periphery of the housing 1, connected to the top wall 11. Multiple side walls 12 are provided, each connected to and sequentially surrounding the top wall 11.

[0063] Battery device 2 is a module in the energy storage device used to store or provide energy.

[0064] The first protective coating 111 can be a coating applied to the top wall 11, used to protect the top wall 11 and give it specific functions to improve its performance. By applying the first protective coating 111 to the surface of the top wall 11 facing away from the cavity 10, the first protective coating 111 protects the top wall 11 from the outside. The first radiative cooling coating 1112 can be a partial coating structure of the first protective coating 111. As a passive radiative cooling coating, it enables the surface of the top wall 11 to reflect most of the sunlight, while effectively radiating heat into outer space in the mid-infrared direction, reducing the temperature rise of the energy storage device caused by sunlight exposure.

[0065] The second protective coating 121 can be a coating applied to the sidewall 12, used to protect the sidewall 12 and give it specific functions to improve its performance. By applying the second protective coating 121 to the surface of the sidewall 12 facing away from the cavity 10, the second protective coating 121 protects the sidewall 12 from the outside. The second radiative cooling coating 1212 can be a partial coating structure of the second protective coating 121. As a passive radiative cooling coating, it can reflect most of the sunlight on the surface of the sidewall 12, while effectively radiating heat into outer space in the mid-infrared direction, reducing the temperature rise of the energy storage device caused by sunlight exposure.

[0066] For example, the first protective coating 111 and the second protective coating 121 can be the same coating structure with the same structure and function, which is applied to the wall of the box 1 so that the box 1 is not easily heated by sunlight.

[0067] In the above structure, since the top wall 11 of the housing 1 is provided with a first protective coating 111 including a first radiative cooling coating 1112, and the side wall 12 is provided with a second protective coating 121 including a second radiative cooling coating 1212, when sunlight shines on the top wall 11 and side wall 12 of the housing 1, the heat can be effectively reflected away by the first radiative cooling coating 1112 and the second radiative cooling coating 1212, which is less likely to cause the temperature of the energy storage device to rise, thereby reducing the energy loss generated by the energy storage device for cooling and helping to reduce the energy consumption of the energy storage device.

[0068] In some embodiments, reference Figure 3 The first radiation cooling coating 1112 is disposed on the surface of the top wall 11, and the first protective coating 111 also includes a first anti-corrosion coating 1111, which is disposed on the outside of the first radiation cooling coating 1112 away from the cavity 10.

[0069] The first anti-corrosion coating 1111 can be a coating structure used to protect the top wall 11 from corrosion. By including the first anti-corrosion coating 1111 in the first protective coating 111, the first protective coating 111 can protect the top wall 11 from corrosion. By disposing the first radiative cooling coating 1112 on the surface of the top wall 11 and disposing the first anti-corrosion coating 1111 on the outer side of the first radiative cooling coating 1112 away from the cavity 10, the first anti-corrosion coating 1111 can isolate the first radiative cooling coating 1112 from the external environment, reducing the possibility of corrosion of the first radiative cooling coating 1112 due to factors such as rainwater and oxygen in the external environment, and thus helping to extend the service life of the first radiative cooling coating 1112.

[0070] For example, the first radiation-cooling coating 1112 may include at least one of a transparent insulating heat-dissipating coating, a super-double light-repellent radiation-resistant cooling coating, and a novel super-double light-repellent radiation-resistant cooling coating. Specifically, the first radiation-cooling coating 1112 may be made of a transparent insulating heat-dissipating coating, a super-double light-repellent radiation-resistant cooling coating, or a novel super-double light-repellent radiation-resistant cooling coating; or, the first radiation-cooling coating 1112 may be made by mixing a transparent insulating heat-dissipating coating and a super-double light-repellent radiation-resistant cooling coating, or a mixture of both; or, the first radiation-cooling coating 1112 may be made by mixing a transparent insulating heat-dissipating coating, a super-double light-repellent radiation-resistant cooling coating, and a novel super-double light-repellent radiation-resistant cooling coating.

[0071] For example, the first anti-corrosion coating 1111 may include at least one of coal tar enamel, petroleum asphalt, polyethylene adhesive tape, epoxy resin, and polyolefin. Alternatively, the first anti-corrosion coating 1111 may be made from coal tar enamel, petroleum asphalt, polyethylene adhesive tape, epoxy resin, or polyolefin; or it may be made by mixing at least two of coal tar enamel, petroleum asphalt, polyethylene adhesive tape, epoxy resin, or polyolefin.

[0072] In some embodiments, reference Figure 4The first protective coating 111 also includes a first anti-corrosion coating 1111, which is disposed on the surface of the top wall 11, and a first radiation cooling coating 1112 is disposed on the outside of the first anti-corrosion coating 1111 away from the cavity 10.

[0073] As described above, the first anti-corrosion coating 1111 can be a coating structure used to protect the top wall 11 from corrosion.

[0074] By applying a first anti-corrosion coating 1111 to the surface of the top wall 11 and a first radiation cooling coating 1112 to the outer surface of the first anti-corrosion coating 1111 away from the cavity 10, the first anti-corrosion coating 1111 is positioned between the surface of the top wall 11 and the first radiation cooling coating 1112. Since the first anti-corrosion coating 1111 directly covers the outer surface of the top wall 11 away from the cavity 10, the possibility of contact between the outer surface of the top wall 11 away from the cavity 10 and other substances is reduced, which helps to improve the anti-corrosion effect of the first protective coating 111 on the top wall 11.

[0075] In some embodiments, reference Figure 5 The second radiation cooling coating 1212 is disposed on the surface of the side wall 12, and the second protective coating 121 also includes a second anti-corrosion coating 1211, which is disposed on the outside of the second radiation cooling coating 1212 away from the cavity 10.

[0076] The second anti-corrosion coating 1211 can be a coating structure used to protect the sidewall 12 from corrosion. By including the second anti-corrosion coating 1211 in the second protective coating 121, the second protective coating 121 can protect the sidewall 12 from corrosion. By disposing the second radiation cooling coating 1212 on the surface of the sidewall 12 and disposing the second anti-corrosion coating 1211 on the outer side away from the cavity 10, the second anti-corrosion coating 1211 can isolate the first radiation cooling coating 1212 from the external environment, reducing the possibility of corrosion of the second radiation cooling coating 1212 due to factors such as rainwater and oxygen in the external environment, and thus helping to extend the service life of the second radiation cooling coating 1212.

[0077] For example, the second radiation-cooling coating 1212 may include at least one of a transparent insulating heat-dissipating coating, a super-double light-repellent radiation-resistant cooling coating, and a novel super-double light-repellent radiation-resistant cooling coating. Alternatively, the second radiation-cooling coating 1212 may be made of a transparent insulating heat-dissipating coating, a super-double light-repellent radiation-resistant cooling coating, or a novel super-double light-repellent radiation-resistant cooling coating; or, the second radiation-cooling coating 1212 may be made by mixing a transparent insulating heat-dissipating coating and a super-double light-repellent radiation-resistant cooling coating, or a mixture of both; or, the second radiation-cooling coating 1212 may be made by mixing a transparent insulating heat-dissipating coating, a super-double light-repellent radiation-resistant cooling coating, and a novel super-double light-repellent radiation-resistant cooling coating.

[0078] For example, the second anti-corrosion coating 1211 may include at least one of coal tar enamel, petroleum asphalt, polyethylene adhesive tape, epoxy resin, and polyolefin. Alternatively, the second anti-corrosion coating 1211 may be made from coal tar enamel, petroleum asphalt, polyethylene adhesive tape, epoxy resin, or polyolefin; or it may be made by mixing at least two of coal tar enamel, petroleum asphalt, polyethylene adhesive tape, epoxy resin, or polyolefin.

[0079] In some embodiments, the first radiation cooling coating 1112 and the second radiation cooling coating 1212 may be made of the same material or different materials, and those skilled in the art can make the settings according to the actual situation; the first anti-corrosion coating 1111 and the second anti-corrosion coating 1211 may be made of the same material or different materials, and those skilled in the art can make the settings according to the actual situation.

[0080] In some embodiments, reference Figure 6 The second protective coating 121 also includes a second anti-corrosion coating 1211, which is disposed on the surface of the side wall 12, and the second radiation cooling coating 1212 is disposed on the outside of the second anti-corrosion coating 1211 away from the cavity 10.

[0081] As described above, the second anti-corrosion coating 1211 can be a coating structure used to protect the sidewall 12 from corrosion.

[0082] By applying the second anti-corrosion coating 1211 to the surface of the sidewall 12 and the second radiation cooling coating 1212 to the outer side of the second anti-corrosion coating 1211 away from the cavity 10, the second anti-corrosion coating 1211 is positioned between the surface of the top wall 11 and the second radiation cooling coating 1212. Since the second anti-corrosion coating 1211 directly covers the outer surface of the top wall 11 away from the cavity 10, the possibility of contact between the outer surface of the top wall 11 away from the cavity 10 and other substances is reduced, which is beneficial to improving the anti-corrosion effect of the second protective coating 121 on the top wall 11.

[0083] In some embodiments, the second protective coating 121 includes an upper region 1213 and a lower region 1214 that are connected to each other, wherein the thickness of the second anti-corrosion coating 1211 in the lower region 1214 is greater than the thickness of the second anti-corrosion coating 1211 in the upper region 1213.

[0084] The upper region 1213 and the lower region 1214 are two different regions connected to each other in the second protective coating 121, wherein, in the vertical direction Z, the upper region 1213 is located above the lower region 1214.

[0085] By setting the thickness of the second anti-corrosion coating 1211 in the lower region 1214 to be greater than the thickness of the second anti-corrosion coating 1211 in the upper region 1213, the corrosion resistance of the lower region 1214 is stronger than that of the upper region 1213. Since rainwater and condensate on the outer wall of the enclosure 1 will slide down to the lower region 1214 under gravity, the lower part of the side wall 12 is more susceptible to corrosion. Setting the thickness of the second anti-corrosion coating 1211 in the lower region 1214 to be greater than the thickness of the second anti-corrosion coating 1211 in the upper region 1213 helps reduce the likelihood of corrosion on the lower part of the side wall 12, thus extending the service life of the enclosure 1.

[0086] In some embodiments, the thickness of the second radiation cooling coating 1212 in the lower region 1214 is less than the thickness of the second radiation cooling coating 1212 in the upper region 1213.

[0087] Since the thickness of the second anti-corrosion coating 1211 in the lower region 1214 is greater than the thickness of the second anti-corrosion coating 1211 in the upper region 1213, by setting the thickness of the second radiative cooling coating 1212 in the lower region 1214 to be less than the thickness of the second radiative cooling coating 1212 in the upper region 1213, it is beneficial to make the thickness of the second radiative cooling coating 1212 in the lower region 1214 plus the thickness of the second anti-corrosion coating 1211 equal to the thickness of the second radiative cooling coating 1212 in the upper region 1213 plus the thickness of the second anti-corrosion coating 1211. This is beneficial to make the thickness of the upper region 1213 equal to the thickness of the lower region 1214, so that the overall thickness of the second protective coating 121 on the sidewall 12 remains consistent, which is beneficial to make the surface of the energy storage device smooth.

[0088] In some embodiments, in the second protective coating 121, the thickness of the upper region 1213 is equal to the thickness of the lower region 1214, and the overall thickness of the second protective coating 121 on the sidewall 12 remains consistent, which helps to make the surface of the energy storage device smooth. In other embodiments, the thickness of the upper region 1213 and the lower region 1214 in the second protective coating 121 are not equal. Those skilled in the art can set the thickness of the upper region 1213 and the lower region 1214 according to the actual situation so that the second protective coating 121 meets the functional requirements.

[0089] In some embodiments, the height of the lower region 1214 along the vertical direction Z is set to G, where 0.3m ≤ G ≤ 0.7m.

[0090] By setting the height G of the lower region 1214 in the vertical direction Z to a range of 0.3m≤G≤0.7m, not only is the lower region 1214 high enough to protect the lower part of the side wall 12, but the lower region 1214 is also less likely to have an excessively high height that would affect the heat reflection capability of the second protective coating 121.

[0091] In some embodiments, the height G of the lower region 1214 in the vertical direction Z is set to a range of 0.4m ≤ G ≤ 0.6m. For example, the height G of the lower region 1214 in the vertical direction Z can be set to 0.4m, 0.5m, or 0.6m, which not only ensures that the lower region 1214 has sufficient height to protect the lower part of the sidewall 12, but also prevents the lower region 1214 from having an excessively high height that would affect the heat reflection capability of the second protective coating 121.

[0092] In some embodiments, the thickness of the first radiation cooling coating 1112 is greater than that of the second radiation cooling coating 1212.

[0093] By setting the thickness of the first radiative cooling coating 1112 to be greater than the thickness of the second radiative cooling coating 1212, the heat reflection capability of the first protective coating 111 is greater than that of the second protective coating 121. Since the first protective coating 111 is disposed on the outer surface of the top wall 11 located at the top of the housing 1, the first protective coating 111 can better reflect the heat of the top wall 11 that is exposed to more sunlight, which is beneficial for better reflecting away the heat received by the energy storage device.

[0094] In some embodiments, the thickness of the first radiation cooling coating 1112 is set to H1, 400μm≤H1≤900μm; the thickness of the first anti-corrosion coating 1111 is set to H2, 300μm≤H2≤600μm.

[0095] By setting the thickness H1 of the first radiation cooling coating 1112 to a range of 400μm≤H1≤900μm, not only is the first radiation cooling coating 1112 thick enough to allow the first protective coating 111 to reflect the heat received by the top wall 11, but the first radiation cooling coating 1112 is also less likely to cause material waste due to excessive thickness.

[0096] In some embodiments, the thickness H1 of the first radiation cooling coating 1112 is set to a range of 500 μm ≤ H1 ≤ 800 μm. For example, the thickness H1 of the first radiation cooling coating 1112 can be set to 500 μm, 600 μm, 700 μm or 800 μm, which not only ensures that the first radiation cooling coating 1112 has sufficient thickness to reflect the heat received by the top wall 11 from the first protective coating 111, but also prevents the first radiation cooling coating 1112 from wasting material due to excessive thickness.

[0097] By setting the thickness H2 of the first anti-corrosion coating 1111 to a range of 300μm≤H2≤600μm, not only is the first anti-corrosion coating 1111 thick enough to give the first protective coating 111 good anti-corrosion ability, but the first anti-corrosion coating 1111 is also less likely to cause material waste due to excessive thickness.

[0098] In some embodiments, the thickness H2 of the first anti-corrosion coating 1111 is set to a range of 400μm≤H2≤500μm. For example, the thickness H2 of the first anti-corrosion coating 1111 can be set to 400μm, 450μm, or 500μm, which not only ensures that the first anti-corrosion coating 1111 has sufficient thickness to provide good corrosion resistance, but also prevents material waste due to excessive thickness.

[0099] The thickness H3 of the second radiation cooling coating 1212 in the upper region 1213 is set to be 200μm≤H3≤600μm. This not only ensures that the second radiation cooling coating 1212 in the upper region 1213 has sufficient thickness to allow the second protective coating 121 to reflect the heat received by the top wall 11, but also prevents the second radiation cooling coating 1212 in the upper region 1213 from wasting material due to excessive thickness.

[0100] In some embodiments, the thickness H3 of the second radiation cooling coating 1212 in the upper region 1213 is set to a range of 300 μm ≤ H3 ≤ 500 μm. Exemplarily, the thickness H3 of the second radiation cooling coating 1212 in the upper region 1213 can be set to 300 μm, 400 μm, or 500 μm. This not only ensures that the second radiation cooling coating 1212 in the upper region 1213 has sufficient thickness to allow the second protective coating 121 to reflect the heat received by the top wall 11, but also prevents material waste due to excessive thickness of the second radiation cooling coating 1212 in the upper region 1213.

[0101] The thickness H4 of the second anti-corrosion coating 1211 in the upper region 1213 is set to be 100μm≤H4≤400μm. This not only ensures that the second anti-corrosion coating 1211 in the upper region 1213 has sufficient thickness to give the second protective coating 121 good anti-corrosion performance, but also prevents the second anti-corrosion coating 1211 in the upper region 1213 from wasting material due to excessive thickness.

[0102] In some embodiments, the thickness H4 of the second anti-corrosion coating 1211 in the upper region 1213 is set to a range of 200μm≤H4≤300μm. Exemplarily, the thickness H4 of the second anti-corrosion coating 1211 in the upper region 1213 can be set to 200μm, 250μm, or 300μm. This not only ensures that the second anti-corrosion coating 1211 in the upper region 1213 has sufficient thickness to provide good anti-corrosion performance, but also prevents material waste due to excessive thickness.

[0103] The thickness H5 of the second radiation cooling coating 1212 in the lower region 1214 is set to be 50μm≤H5≤350μm. This not only ensures that the second radiation cooling coating 1212 in the lower region 1214 has sufficient thickness to allow the second protective coating 121 to reflect the heat received by the top wall 11, but also prevents the second radiation cooling coating 1212 in the lower region 1214 from wasting material due to excessive thickness.

[0104] In some embodiments, the thickness H5 of the second radiation cooling coating 1212 in the lower region 1214 is set to be in the range of 100 μm ≤ H5 ≤ 300 μm. For example, the thickness H5 of the second radiation cooling coating 1212 in the lower region 1214 can be set to 100 μm, 200 μm, or 300 μm. This not only ensures that the second radiation cooling coating 1212 in the lower region 1214 has sufficient thickness to allow the second protective coating 121 to reflect the heat received by the top wall 11, but also prevents the second radiation cooling coating 1212 in the lower region 1214 from wasting material due to excessive thickness.

[0105] The thickness H6 of the second anti-corrosion coating 1211 in the lower region 1214 is set to be 300μm≤H6≤600μm. This not only ensures that the second anti-corrosion coating 1211 in the lower region 1214 has sufficient thickness to give the second protective coating 121 good anti-corrosion performance, but also prevents the second anti-corrosion coating 1211 in the lower region 1214 from wasting material due to excessive thickness.

[0106] In some embodiments, the thickness H6 of the second anti-corrosion coating 1211 in the lower region 1214 is set to a range of 400μm≤H6≤500μm. For example, the thickness H6 of the second anti-corrosion coating 1211 in the lower region 1214 can be set to 400μm, 450μm, or 500μm. This not only ensures that the second anti-corrosion coating 1211 in the lower region 1214 has sufficient thickness to provide good anti-corrosion performance, but also prevents material waste due to excessive thickness.

[0107] Some embodiments of this application also provide an energy storage system, which includes a power conversion device and at least one energy storage device provided by the above-described technical solutions. The power conversion device is used to electrically connect a power generation device and at least one energy storage device.

[0108] Some embodiments of this application provide an energy storage device, which includes a housing 1 and a battery device 2. The battery device 2 is disposed in a cavity 10 of the housing 1. The housing 1 includes a top wall 11 and a side wall 12 connected to the top wall 11. The surface of the top wall 11 facing away from the cavity 10 is provided with a first protective coating 111, which includes a first anti-corrosion coating 1111 and a first radiation cooling coating 1112. The first anti-corrosion coating 1111 is disposed on the surface of the top wall 11, and the first radiation cooling coating 1112 is disposed on the surface of the first anti-corrosion coating. The outer side of layer 1111 is away from the cavity 10. The side wall 12 is provided with a second protective coating 121 on the surface away from the cavity 10, including a second anti-corrosion coating 1211 and a second radiation cooling coating 1212. The second anti-corrosion coating 1211 is disposed on the surface of the side wall 12, and the second radiation cooling coating 1212 is disposed on the outer side of the second anti-corrosion coating 1211 away from the cavity 10. The thickness of the second anti-corrosion coating 1211 in the lower region 1214 is greater than the thickness of the second anti-corrosion coating 1211 in the upper region 1213.

[0109] In the above structure, since the top wall 11 of the housing 1 is provided with a first protective coating 111 including a first radiative cooling coating 1112, and the side wall 12 is provided with a second protective coating 121 including a second radiative cooling coating 1212, when sunlight shines on the top wall 11 and side wall 12 of the housing 1, the heat will be reflected away by the first radiative cooling coating 1112 and the second radiative cooling coating 1212, which will not easily cause the temperature of the energy storage device to rise. This can reduce the energy loss generated by the energy storage device for cooling, and is conducive to reducing the energy consumption of the energy storage device.

[0110] 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 in that, include: A housing having a cavity, the housing including a top wall and side walls connected to the top wall; A battery device is disposed in the cavity. The surface of the top wall facing away from the cavity is provided with a first protective coating, and the surface of the side wall facing away from the cavity is provided with a second protective coating. The first protective coating includes a first radiation cooling coating, and the second protective coating includes a second radiation cooling coating. The second protective coating further includes a second anti-corrosion coating, which comprises an upper region and a lower region connected to each other, wherein the thickness of the second anti-corrosion coating in the lower region is greater than the thickness of the second anti-corrosion coating in the upper region.

2. The energy storage device according to claim 1, characterized in that, The first radiation cooling coating is disposed on the surface of the top wall, and the first protective coating further includes a first anti-corrosion coating, which is disposed on the outside of the first radiation cooling coating away from the cavity.

3. The energy storage device according to claim 1, characterized in that, The first protective coating further includes a first anti-corrosion coating, which is disposed on the surface of the top wall, and the first radiative cooling coating is disposed on the outer side of the first anti-corrosion coating away from the cavity.

4. The energy storage device according to any one of claims 1-3, characterized in that, The second radiation cooling coating is disposed on the surface of the sidewall, and the second anti-corrosion coating is disposed on the outer side of the second radiation cooling coating away from the cavity.

5. The energy storage device according to any one of claims 1-3, characterized in that, The second anti-corrosion coating is disposed on the surface of the sidewall, and the second radiation cooling coating is disposed on the outer side of the second anti-corrosion coating away from the cavity.

6. The energy storage device according to claim 1, characterized in that, The thickness of the second radiation-cooling coating in the lower region is less than the thickness of the second radiation-cooling coating in the upper region.

7. The energy storage device according to claim 6, characterized in that, In the vertical direction, the height of the lower area is set to G, where 0.3m ≤ G ≤ 0.7m.

8. The energy storage device according to any one of claims 6-7, characterized in that, The thickness of the second radiation cooling coating in the upper region is set to H3, 200μm≤H3≤600μm; the thickness of the second anti-corrosion coating in the upper region is set to H4, 100μm≤H4≤400μm. The thickness of the second radiation-cooling coating in the lower region is set to H5, where 50μm≤H5≤350μm; The thickness of the second anti-corrosion coating in the lower region is set to H6, where 300μm≤H6≤600μm.

9. The energy storage device according to any one of claims 1-8, characterized in that, The thickness of the first radiation-cooling coating is greater than that of the second radiation-cooling coating.

10. The energy storage device according to any one of claims 2 or 3, characterized in that, The thickness of the first radiation cooling coating is set to H1, 400μm≤H1≤900μm; the thickness of the first anti-corrosion coating is set to H2, 300μm≤H2≤600μm.

11. The energy storage device according to claim 10, characterized in that, 500μm≤H1≤800μm, 400μm≤H2≤500μm.

12. An energy storage system, characterized in that, include: Power conversion device; At least one energy storage device as described in any one of claims 1-11, wherein the power conversion device is used to electrically connect a power generation device and at least one of the energy storage devices.

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