Energy storage device, energy storage system and charging network

Abstract

The application belongs to the technical field of energy storage devices, and provides an energy storage device, an energy storage system and a charging network, comprising a box body and a battery device arranged in the box body, the box body comprising a top protection piece, side plates, a bottom protection piece and columns, the top of the columns is connected with the top protection piece, the bottom of the columns is connected with the bottom protection piece, and the side plates are arranged between adjacent columns in the circumferential direction perpendicular to the height direction of the box body; the outer surface of the columns is provided with a protection film, and the protection film comprises a protection layer, a shielding layer and a polyurea coating arranged in sequence from inside to outside. The surface of the columns is provided with the protection film, the protection film adopts a three-layer laminated structure, forms triple protection, gradually delays the rhythm of corrosion reaching the columns, and prolongs the service life of the box body. The outermost layer selects a polyurea coating with high toughness and wear resistance, can directly resist external physical impact and scratching, protects the protection layer and the shielding layer, and reduces the risk of damage of the protection film caused by external physical impact and scratching.

Description

Technical Field

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

[0002] As the capacity and weight of energy storage devices continue to increase, the outer surface of these devices is prone to mechanical damage during manufacturing, transportation, installation, and use, involving various working conditions and scenarios such as hoisting, stacking, and transport.

[0003] Energy storage devices typically use steel structures. Conventional coatings have high hardness but poor toughness, making them prone to brittle cracking or peeling when subjected to hoisting scrapes or forklift impacts. Once the coating is damaged, the steel structure surface is exposed and susceptible to corrosion, which is detrimental to the long-term use of the energy storage device. Utility Model Content

[0004] The purpose of this application is to provide an energy storage device, an energy storage system, and a charging network to solve the technical problem that the coating on the surface of the energy storage device's casing is easily damaged, affecting its service life.

[0005] In a first aspect, this application provides an energy storage device, including a housing and a battery device disposed within the housing. The housing includes a top protective member, side panels, a bottom protective member, and columns. The top of the columns is connected to the top protective member, and the bottom of the columns is connected to the bottom protective member. In the circumferential direction perpendicular to the height of the housing, the side panels are disposed between adjacent columns. The outer surface of the column is provided with a protective film, which includes a protective layer, a shielding layer and a polyurea coating arranged sequentially from the inside to the outside.

[0006] The energy storage device provided in this application embodiment has a protective film on the surface of the column. The protective film adopts a three-layer stacked structure to form triple protection, which gradually slows down the rate at which corrosion reaches the column and extends the life of the energy storage device. At the same time, the outermost layer is made of polyurea coating with high toughness and wear resistance, which can directly resist external physical impacts and scratches, protect the protective layer and shielding layer, and reduce the risk of damage to the protective layer and shielding layer caused by external physical impacts and scratches.

[0007] Optionally, the protective layer is an epoxy zinc-rich layer; and / or, the shielding layer is an epoxy micaceous iron oxide layer.

[0008] By setting an epoxy zinc-rich layer as a protective layer, electrochemical protection can be formed at the point of damage to the protective film, reducing the spread of corrosion. The epoxy micaceous iron oxide layer acts as a shielding layer, forming an isolation barrier and reducing corrosion. When external moisture, oxygen, etc., attempt to penetrate through the damaged polyurea coating, they need to bypass the epoxy micaceous iron oxide layer, extending the penetration path and thus prolonging the protective life.

[0009] Optionally, the dry film thickness of the protective layer is greater than 60 μm and not more than 80 μm, and / or the dry film thickness of the shielding layer is greater than 210 μm and not more than 300 μm, and / or the dry film thickness of the polyurea coating is 1.5 mm to 3.0 mm.

[0010] By controlling the thickness of the dry film in each layer, the outer surface of the column can resist external impacts, reducing the risk of damage and improving the protective effect.

[0011] Optionally, the column is divided into multiple protective zones along its length, and the dry film thickness of the polyurea coating is different in different protective zones.

[0012] The energy storage device provided in this application embodiment divides the column into multiple protection zones, and can flexibly configure the dry film thickness of the polyurea coating according to the risk of each protection zone, thereby achieving optimized allocation of protection resources.

[0013] Optionally, the column is divided into a first protective zone, a second protective zone, and a third protective zone from top to bottom along its length; wherein the dry film thickness of the polyurea coating on the surface of the first protective zone and the third protective zone is greater than the dry film thickness of the polyurea coating on the surface of the second protective zone.

[0014] The polyurea coating has a gradient protective structure on the outer surface of the column, which is thin in the middle and thick at both ends. On the one hand, the thicker polyurea coating can provide stronger impact resistance and wear resistance to the top and bottom of the column, reducing the risk of damage to the box when it is scratched by lifting equipment or hit by forklifts. On the other hand, it can reduce the spraying area of ​​the thick protective film, improve spraying efficiency, and reduce spraying costs.

[0015] Optionally, the dry film thickness of the polyurea coating on the surface of the third protective area is greater than the dry film thickness of the polyurea coating on the surface of the first protective area.

[0016] The dry film thickness of the polyurea coating in the third protection zone is greater than that in the first protection zone, which provides stronger protection for the bottom of the column and extends the maintenance cycle and lifespan of the energy storage device.

[0017] Optionally, the protective film is provided on the surface of the side plate, wherein the dry film thickness of the polyurea coating on the surface of the column is greater than the dry film thickness of the polyurea coating on the surface of the side plate.

[0018] By thickening the polyurea coating on the outer surface of the column, its energy absorption and penetration resistance are enhanced upon impact, thus more effectively protecting the column's base material. Furthermore, the side plate area is much larger than the column; if the polyurea coating on the side plate were thickened to the same thickness as the column, the amount of polyurea material used would increase significantly. In this embodiment, the dry film thickness of the polyurea coating on the column surface is greater than that on the side plate surface. Using a thicker polyurea coating on the column and a thinner coating on the side plate reduces costs and optimizes the allocation of protective resources.

[0019] Optionally, a removable protective cover is provided on the outside of the column. By providing a protective cover on the outside of the column, a physical protective layer is formed on the outside of the protective film, so that the polyurea coating is protected from direct impact and friction, and the wear rate of the protective film is slowed down.

[0020] Optionally, the protective cover is a wooden cover or an elastic cover.

[0021] Optionally, a buffer gap is provided between the protective cover and the column to absorb collision energy and reduce the peak impact force transmitted to the column.

[0022] Optionally, a corner piece is connected between the top of the column and the corner of the top protective member, and a protective film is provided on the surface of the corner piece to improve the durability of the corner piece.

[0023] Optionally, the top of the enclosure is provided with at least six corner pieces, and the top protective member is provided with at least one reinforcing beam, wherein four corner pieces are located at the four top corners of the enclosure, and the other at least two corner pieces are located on the reinforcing beam.

[0024] Compared to the traditional four-point lifting method, this method increases the number of connection points between the lifting rope and the energy storage device from four to at least six, thereby making the force on each connection point more even. This reduces the lateral swaying of the energy storage device during lifting, lowers the probability of collisions with adjacent containers or obstacles, and reduces the chance of the protective membrane being damaged.

[0025] Optionally, the enclosure further includes a bottom crossbeam connected to the bottom protective component, the two ends of the bottom crossbeam being connected to the uprights, and the thickness of the bottom crossbeam being 5mm to 12mm.

[0026] Increasing the thickness of the bottom crossbeam increases the structural mass of the bottom of the enclosure, shifting the overall mass distribution of the energy storage device downwards. This reduces swaying during transportation and hoisting, lowering the probability of collisions and the risk of damage to the protective membrane. Furthermore, the increased thickness of the bottom crossbeam enhances the load-bearing capacity of the energy storage device, providing better support for the battery assembly.

[0027] Optionally, the housing further includes a support beam for supporting the battery device. The support beam is fixedly connected to the column or the side plate, and the distance between the support beam and the bottom protective component is H, where 200mm≤H≤500mm.

[0028] By lowering the installation height of the support beam, the installation position of the battery device is lowered accordingly, ultimately reducing the overall center of gravity of the energy storage device and reducing the swaying amplitude of the energy storage device during hoisting and transportation.

[0029] Secondly, embodiments of this application also provide an energy storage system, including an energy conversion system and an energy storage device as described in the first aspect, wherein the energy conversion system is connected to the energy storage device to convert the current input to the energy storage device or output from the energy storage device into energy.

[0030] Thirdly, embodiments of this application also provide a charging network, including a charging pile and an energy storage device as described in the first aspect or an energy storage system as described in the second aspect, wherein the energy storage device is used to provide electrical energy to the charging pile. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a three-dimensional structural diagram of the energy storage device provided in the embodiments of this application.

[0033] Figure 2 This is a partial enlarged cross-sectional view of the column provided in an embodiment of this application.

[0034] Figure 3 A partial sectional view of the column provided in an embodiment of this application.

[0035] Figure 4 A partial internal structure diagram of the energy storage device provided in the application embodiment.

[0036] Figure 5 This is a schematic diagram of the energy storage system provided in an embodiment of this application.

[0037] Figure 6 This is a schematic diagram of the charging network provided in an embodiment of this application.

[0038] The following are the labeling elements in the figure: 1000. Energy storage devices; 100. Box body; 11. Top protective component; 12. Side panel; 13. Bottom protective component; 14. Column; 15. Protective membrane; 151. Protective layer; 152. Shielding layer; 153. Polyurea coating; 161. First protective zone; 162. Second protective zone; 163. Third protective zone; 17. Corner fitting; 18. Reinforcing beam; 19. Supporting beam; 200. Battery device; 2000, Energy conversion system; 3000, Power generation equipment; 4000, Charging pile; 5000, Connector. Detailed Implementation

[0039] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0040] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0041] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., 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 this application and simplifying the description, and do not 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 this application.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0043] With the iterative updates of large-cell technology in the energy storage industry, the weight of a single energy storage unit's container is constantly increasing; for example, the weight of some energy storage units' containers has exceeded 35 tons. Energy storage units involve various operating conditions and scenarios during hoisting, stacking, and transportation. Under these various scenarios and combined effects, the surface of the energy storage unit's container may suffer severe impacts or scratches.

[0044] For example, when ports and docks use single-point lifting equipment to lift energy storage devices, the container of the energy storage device is prone to swaying from side to side during lifting and movement. When the container collides with adjacent energy storage devices or lifting equipment, the surface of the container is prone to dents, scratches and coating damage.

[0045] For example, during road, rail, and sea transportation, if there are turns, bumps, or ship rocking, repeated friction and impacts can easily occur between energy storage devices and between energy storage devices and fixed devices, resulting in dents or damage to the coating on the surface of the energy storage device's casing.

[0046] Therefore, this application provides an energy storage device 1000, which reduces the risk of dents and coating damage on the surface of the housing 100 during hoisting and transportation by providing a protective film 15 on the surface of the column 14.

[0047] like Figure 1 As shown, this application embodiment provides an energy storage device 1000, including a housing 100 and a battery device 200 disposed within the housing 100. For example... Figure 1 As shown, the enclosure 100 includes a top protective member 11, side panels 12, a bottom protective member 13, and uprights 14. The top of the uprights 14 is connected to the top protective member 11, and the bottom of the uprights 14 is connected to the bottom protective member 13. In the circumferential direction perpendicular to the height of the enclosure 100, the side panels 12 are arranged between adjacent uprights 14.

[0048] Energy storage device 1000 includes one or more battery clusters to increase the voltage and capacity of energy storage device 1000. A battery cluster may include multiple battery devices 200, which are connected in series via a busbar to increase the voltage of energy storage device 1000. When energy storage device 1000 includes multiple battery clusters, the battery clusters are connected in parallel to increase the capacity of energy storage device 1000.

[0049] The energy storage device 1000 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. The energy storage device 1000 can store electrical energy as needed and output it when appropriate. For example, the energy storage device 1000 can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours.

[0050] The enclosure 100 uses columns 14 as its vertical load-bearing frame. Bottom protective members 13 are connected to the bottom of the columns 14, top protective members 11 are connected to the top of the columns 14, and side panels 12 are connected to the columns 14. The side panels 12 are located around the perimeter of the enclosure 100 and are connected to the bottom protective members 13 and top protective members 11 to form an accommodating space. The columns 14 are fixedly connected between the top protective members 11 and the bottom protective members 13 to transfer the lifting load borne by the top protective members 11 to the bottom protective members 13. The side panels 12 are connected between two adjacent columns 14. The wall thickness of the bottom crossbeam of the bottom protective member 13 is greater than the wall thickness of the top crossbeam of the top protective member 11, and the connection strength between the bottom end of the column 14 and the bottom crossbeam is greater than the connection strength between the top end of the column 14 and the top crossbeam, so that the structural center of gravity of the enclosure 100 is biased downwards.

[0051] For example, four uprights 14 are vertically welded to the four corners of the bottom protective member 13 to form the main support frame of the box 100. The top protective member 11 is welded to the top of the uprights 14, and the side plates 12 are welded between two adjacent uprights 14.

[0052] For example, the top protective member 11 can be a panel that encloses the internal space of the box, or it can be an open frame structure located at the top of the box. The bottom protective member 13 can be a panel that encloses the internal space of the box, or it can be an open frame structure located at the bottom of the box.

[0053] For example, the bottom protective member 13 includes a base plate and a bottom crossbeam disposed on the base plate, the bottom crossbeam being welded and fixed to the bottom end of the column 14. The top protective member 11 includes a top plate and a top crossbeam disposed on the top plate, the top crossbeam being welded and fixed to the top end of the column 14. Optionally, the top of the side plate 12 is connected to the top protective member 11, and the bottom is connected to the bottom protective member 13. For example, the four edges of the side plate 12 are welded or riveted to the adjacent column 14, top crossbeam, and bottom crossbeam, respectively.

[0054] like Figure 2 As shown, the outer surface of the column 14 is provided with a protective film 15, which includes a protective layer 151, a shielding layer 152 and a polyurea coating 153 arranged sequentially from the inside to the outside.

[0055] The protective film 15 can be applied to the entire outer surface of the column 14, or it can be applied only to the area of ​​the column 14 exposed outside the housing 100. For example, after the column 14 is connected to the side panel 12, applying the protective film 15 to the exposed area of ​​the column 14 can reduce the coating area of ​​the protective film 15, thereby reducing costs while ensuring the protective effect.

[0056] The protective layer 151, the shielding layer 152, and the polyurea coating 153 are stacked sequentially from the inside out. The protective layer 151 provides primary protection, preventing the column 14 from rusting. The shielding layer 152, as an intermediate layer, increases the thickness of the protective film 15, extending the path for corrosive media such as water vapor, oxygen, and salt ions to penetrate the column 14, thereby improving the overall impermeability and durability of the protective film 15. The polyurea coating 153 has high toughness and wear resistance, directly resisting external physical impacts and scratches, protecting the protective layer 151 and the shielding layer 152.

[0057] The column 14 protrudes outward relative to the side plate 12 or is flush with the side plate 12. When the column 14 protrudes outward relative to the side plate 12, the impact force during hoisting or stacking is preferentially applied to the column 14. In this case, spraying a protective film 15 onto the surface of the column 14 can achieve effective protection. When the column 14 is flush with the side plate 12, the protective film 15 can cover not only the outer surface of the column 14 but also the outer surface of the side plate 12.

[0058] The battery device 200 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 in a mixed configuration via a busbar.

[0059] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells. 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 a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0060] In some embodiments, the battery device 200 may be a battery pack, which includes a housing and one or more battery cell assemblies housed within the housing. As an example, the battery cell assembly may be a battery module, which can be housed within the housing by securing the battery module to the housing. Alternatively, the battery cell assembly may be housed within the housing by directly securing multiple battery cells to the housing.

[0061] The energy storage device 1000 provided in this application embodiment has a protective film 15 on the surface of the column 14. The protective film 15 adopts a three-layer stacked structure to form triple protection, which gradually slows down the rate at which corrosion reaches the column 14 and extends the life of the housing 100. At the same time, the outermost layer is a polyurea coating 153 with high toughness and wear resistance, which can directly resist external physical impacts and scratches, protect the protective layer 151 and the shielding layer 152, and reduce the risk of damage to the protective layer 151 and the shielding layer 152 caused by external physical impacts and scratches.

[0062] In some embodiments of this application, the protective layer 151 is an epoxy zinc-rich layer. And / or, the shielding layer 152 is an epoxy micaceous iron oxide layer.

[0063] For example, the protective layer 151 is an epoxy zinc-rich layer, which can provide cathodic electrochemical protection. Because the electrode potential of zinc powder is much lower than that of steel, in the presence of electrolytes such as humid air and rainwater, the zinc powder preferentially loses electrons and is corroded, while the steel substrate gains electrons and is protected. Even if the protective layer 151 is partially damaged, exposing the substrate of the column 14, the surrounding zinc powder can still provide electrochemical protection to the exposed area, reducing the spread of corrosion.

[0064] Without an epoxy zinc-rich layer, corrosion is likely to occur at the damaged areas of the protective film 15 and spread beneath it, leading to large-area peeling of the protective film 15. By setting an epoxy zinc-rich layer as the protective layer 151, electrochemical protection can be formed at the damaged areas of the protective film 15, reducing the spread of corrosion and improving the protective effect of the protective film 15.

[0065] For example, the shielding layer 152 is an epoxy micaceous iron oxide layer, which can form an isolation barrier and reduce corrosion. When external moisture, oxygen, etc. attempt to penetrate through the damaged part of the polyurea coating 153, they need to bypass the epoxy micaceous iron oxide layer, the penetration path is extended, thereby extending the protection life.

[0066] For example, the protective film 15 includes an epoxy zinc-rich layer, an epoxy micaceous iron oxide layer and a polyurea coating 153 arranged sequentially from the inside to the outside.

[0067] Both the epoxy zinc-rich layer and the epoxy micaceous iron oxide layer belong to the epoxy resin system, and a strong chemical bond can be formed between the two interfaces. At the same time, the rough physical surface of the epoxy micaceous iron oxide layer can provide a good adhesion base for the polyurea coating 153, thus making the protective film 15 an integrated and dense protective structure.

[0068] In addition, the protective layer 151 can also be an inorganic zinc-rich layer or a water-based epoxy zinc-rich layer. The shielding layer 152 can also be an epoxy glass flake coating layer. In some embodiments of this application, the dry film thickness of the protective layer 151 is greater than 60 μm, and / or the dry film thickness of the shielding layer 152 is greater than 210 μm, and / or the dry film thickness of the polyurea coating 153 is 1.5 mm to 3.0 mm.

[0069] Dry film thickness refers to the actual thickness of the coating formed after the coating has completely dried and cured on the substrate surface.

[0070] The dry film thickness of the protective layer 151 does not exceed 80 μm. For example, the dry film thickness of the protective layer 151 is any value greater than 60 μm but not exceeding 80 μm, such as 61 μm, 65 μm, 70 μm, or 80 μm. Taking the protective layer 151 as an epoxy zinc-rich layer as an example, if the epoxy zinc-rich layer is too thin, it cannot provide sufficient zinc powder to maintain continuous electrochemical protection.

[0071] The dry film thickness of the shielding layer 152 does not exceed 300 μm. For example, the dry film thickness of the shielding layer 152 is any value greater than 210 μm but not exceeding 300 μm, such as 211 μm, 220 μm, 240 μm, 270 μm, or 300 μm. Taking the shielding layer 152 as an epoxy micaceous iron oxide layer as an example, its dry film thickness determines the barrier isolation effect. If the epoxy micaceous iron oxide layer thickness is insufficient, the barrier effect will not meet expectations. Therefore, an epoxy micaceous iron oxide layer thicker than 210 μm is required to ensure that the protective film 15 has a good barrier isolation effect.

[0072] Optionally, the dry film thickness of the polyurea coating 153 is 1.8 mm to 2.3 mm. For example, the dry film thickness of the polyurea coating 153 is any value between 1.5 mm and 3 mm, such as 1.5 mm, 3 mm, or 1.6 mm, 2 mm, 2.4 mm, 2.7 mm.

[0073] For example, the dry film thickness of the protective layer 151 is 62 μm, the dry film thickness of the intermediate paint is 230 μm, and the dry film thickness of the polyurea coating 153 is 2.0 mm. Alternatively, the dry film thickness of the protective layer 151 may be 68 μm, the dry film thickness of the intermediate paint may be 210 μm, and the dry film thickness of the polyurea coating 153 may be 2.5 mm.

[0074] The energy storage device 1000 provided in this application embodiment controls the dry film thickness of each layer, enabling the column 14 to resist external impacts, reducing the risk of damage and improving the protective effect.

[0075] In some embodiments of this application, such as Figure 3 As shown, the column 14 is divided into multiple protective zones along its length, and the dry film thickness of the polyurea coating 153 is different in different protective zones.

[0076] The risks vary at different locations along the length of the column 14. Specifically, the top area of ​​the column 14 is prone to collision with the lifting equipment during hoisting, the middle area is prone to friction with the straps during transportation, and the bottom area is susceptible to impact from forklift handling and stacking compression. The column 14 is divided into multiple protective zones along its length, each with a polyurea coating 153 of varying thicknesses according to its pre-set operating conditions.

[0077] For example, the column 14 is divided into two, three, four, or five protective zones along its length. For instance, the column 14 is divided into five protective zones along its length, with the middle protective zone having the smallest dry film thickness of the polyurea coating 153; the dry film thickness of the polyurea coating 153 gradually decreases from the top protective zone to the middle protective zone, and also from the bottom protective zone to the middle protective zone.

[0078] It should be noted that the dry film thickness of the polyurea coating 153 in each protected area is 1.5mm to 3.0mm. The dry film thicknesses of the protective layer 151 and the shielding layer 152 in each protected area can be the same or different.

[0079] The energy storage device 1000 provided in this application embodiment can divide the column 14 into multiple protection zones, and can flexibly configure the dry film thickness of the polyurea coating 153 according to the risk of each protection zone, thereby achieving optimized allocation of protection resources.

[0080] In some embodiments of this application, such as Figure 3 As shown, the column 14 is divided into a first protective zone 161, a second protective zone 162, and a third protective zone 163 along its length from top to bottom. The dry film thickness of the polyurea coating 153 on the surface of the first protective zone 161 and the third protective zone 163 is greater than that on the surface of the second protective zone 162.

[0081] The first protective zone 161 is located at the top of the column 14, and the third protective zone 163 is located at the bottom of the column 14. Optionally, the first protective zone 161, the second protective zone 162, and the third protective zone 163 have the same length, that is, the column 14 is divided into three equal parts along its length: the first protective zone 161, the second protective zone 162, and the third protective zone 163. Alternatively, the lengths of the first protective zone 161, the second protective zone 162, and the third protective zone 163 may differ in at least two ways. For example, the first protective zone 161 and the third protective zone 163 may have the same length, and both may be shorter than the second protective zone 162. Or, the lengths of the first protective zone 161, the second protective zone 162, and the third protective zone 163 may increase sequentially.

[0082] For example, the first protection zone 161 corresponds to the stress height of the corner fitting 17 during hoisting operations, and the third protection zone 163 corresponds to the impact height during forklift handling and stacking. The frequency and intensity of mechanical impacts that the two zones experience throughout the entire life cycle of the housing 100 are higher than those of the second protection zone 162. By providing a thicker polyurea coating 153 in the first protection zone 161 and the third protection zone 163, and a thinner polyurea coating 153 in the second protection zone 162, reliable protection capabilities are ensured in high-risk areas while reducing material waste caused by the amount of polyurea coating 153 used in low-risk areas.

[0083] During the spraying process, the thickness of different protective zones can be differentiated by controlling the number of sprays. For example, two or three overlapping sprays are applied to the first protective zone 161 and the third protective zone 163 to achieve a dry film thickness of 2.5mm to 3.0mm for the polyurea coating 153; a single spray is applied to the second protective zone 162 of the column 14 to control the dry film thickness of the polyurea coating 153 to 1.5mm to 2.0mm.

[0084] The energy storage device 1000 provided in this application embodiment has a polyurea coating 153 on the outer surface of the column 14 with a gradient protective structure that is thinner in the middle and thicker at both ends. On the one hand, the thicker polyurea coating 153 can provide stronger impact resistance and wear resistance to the top and bottom of the column 14, reducing the risk of damage to the housing 100 when it is scratched by the lifting equipment or hit by the forklift. On the other hand, it can reduce the spraying area of ​​the thicker polyurea coating 153, improve spraying efficiency, and reduce spraying cost.

[0085] In some embodiments of this application, the dry film thickness of the polyurea coating 153 on the surface of the third protective area 163 is greater than the dry film thickness of the polyurea coating 153 on the surface of the first protective area 161.

[0086] For example, in the first protective area 161, the dry film thickness of the polyurea coating 153 is 2.2 mm to 2.5 mm; in the third protective area 163, the dry film thickness of the polyurea coating 153 is 1.8 mm to 2.1 mm; and in the second protection, the dry film thickness of the polyurea coating 153 is 1.5 mm to 1.7 mm.

[0087] The bottom of the column 14 needs to withstand the rigid impact of forklift handling, the continuous pressure of multi-layer stacking, and the corrosion from harsh environments such as ground water, salt spray, and mud. If the protective film 15 fails and causes the column 14 to corrode, it will threaten the structural safety of the energy storage device 1000. Therefore, in this application, the dry film thickness of the polyurea coating 153 in the third protective zone 163 is greater than the dry film thickness of the polyurea coating 153 in the first protective zone 161, giving the bottom of the column 14 stronger protection and extending the maintenance cycle and life of the housing 100.

[0088] In some embodiments of this application, a protective film 15 is provided on the surface of the side plate 12. The dry film thickness of the polyurea coating 153 on the surface of the column 14 is greater than the dry film thickness of the polyurea coating 153 on the surface of the side plate 12.

[0089] The protective film 15 can be applied to the entire outer surface or a portion of the outer surface of the side panel 12. It should be noted that when the column 14 has multiple protective areas, the dry film thickness of the polyurea coating 153 on the surface of the column 14 being greater than the dry film thickness of the polyurea coating 153 on the surface of the side panel 12 means that the thinnest dry film thickness of the polyurea coating 153 on the surface of the column 14 is greater than the dry film thickness of the polyurea coating 153 on the surface of the side panel 12.

[0090] The dry film thickness of the protective layer 151 on the surface of the column 14 can be the same as or different from the dry film thickness of the protective layer 151 on the surface of the side plate 12. For example, the dry film thickness of the protective layer 151 on the surface of the column 14 can be less than the dry film thickness of the protective layer 151 on the surface of the side plate 12.

[0091] The dry film thickness of the shielding layer 152 on the surface of the column 14 can be the same as or different from the dry film thickness of the shielding layer 152 on the surface of the side plate 12. For example, the dry film thickness of the shielding layer 152 on the surface of the column 14 can be less than the dry film thickness of the shielding layer 152 on the surface of the side plate 12.

[0092] For example, the protective film 15 continuously covers the outer surface of the column 14 and the outer surface of the side panel 12. At the overlap junction of the column 14 and the side panel 12, the protective film 15 covers the weld at the overlap junction, thereby forming a seamless integrated protective structure and improving the ability of the enclosure 100 to resist physical impacts and environmental erosion.

[0093] For example, the protective film 15 is disposed in the edge area susceptible to lateral compression, such as at the junction of the side plate 12 and the upright 14, and within a range of 100mm to 200mm from the edge of the upright 14. Alternatively, the protective film 15 is disposed within a range of 300mm to 1200mm above the bottom of the side plate 12 to reduce impacts on the side plate 12 caused by fork collisions, bottom compression during stacking, etc.

[0094] The column 14 protrudes outward from the side plate 12, while the side plate 12 is recessed relative to the column 14. During hoisting and transportation, the column 14 is the first to come into contact with the external impact object and is protected by it. The side plate 12 is only touched when the impact object penetrates deeply. Therefore, the frequency and intensity of mechanical impacts experienced by the column 14 are much higher than those of the side plate 12, thus requiring a thicker protective film 15 to provide stronger impact resistance and wear resistance. In the energy storage device 1000 provided in this application embodiment, the dry film thickness of the polyurea coating 153 on the surface of the column 14 is greater than that on the surface of the side plate 12. By thickening the polyurea coating 153 on the outer surface of the column 14, its energy absorption capacity and penetration resistance are stronger when subjected to impact, thus more effectively protecting the substrate of the column 14.

[0095] Furthermore, the area of ​​the side panel 12 is much larger than that of the column 14. If the polyurea coating 153 of the side panel 12 is thickened to the same thickness as that of the column 14, the amount of polyurea material used will increase significantly. In this embodiment, the dry film thickness of the polyurea coating 153 on the surface of the column 14 is greater than that on the surface of the side panel 12. Using a thicker polyurea coating 153 on the column 14 and a thinner polyurea coating 153 on the side panel 12 can reduce costs and achieve optimized allocation of protective resources.

[0096] In some embodiments of this application, microcapsules are dispersed within the polyurea coating 153, and a repair agent is encapsulated within each microcapsule. The microcapsules are designed to rupture and release the repair agent when cracks develop in the polyurea coating 153.

[0097] During use, the polyurea coating 153 may develop microcracks with widths on the micrometer scale due to repeated thermal expansion and contraction or minor impacts. Without intervention, these microcracks will gradually propagate under the influence of moisture and salt spray, eventually causing the protective film 15 to peel off. To address this, microcapsules are added to the polyurea coating 153. When microcracks appear in the protective film 15, the stress concentration at the crack tip causes the passing microcapsules to rupture, releasing the encapsulated repair agent. This repair agent automatically fills the crack gaps through capillary action and reacts chemically with residual isocyanate or amine groups in the polyurea coating 153 to form new chemical bonds, reconnecting the polyurea molecules on both sides of the crack.

[0098] For example, the repair agent is a mixture of oligomer and curing agent that can chemically react with isocyanate groups or amine groups in the polyurea coating 153.

[0099] The energy storage device 1000 provided in this application embodiment disperses microcapsules within the polyurea coating 153. The repair agent encapsulated within the microcapsules can resist the cumulative effect of multiple micro-damages, slow down the rate at which micro-cracks expand into breakage, reduce the rate at which the performance of the protective film 15 degrades over time, and thus extend the effective lifespan of the protective film 15.

[0100] In some embodiments of this application, a self-healing nanomaterial is added to the polyurea coating 153. Optionally, the self-healing nanomaterial is graphene oxide or self-healing nanoparticles.

[0101] In some embodiments of this application, a removable protective cover is provided on the outer side of the column 14.

[0102] The protective shield is a component independent of the column 14 and withstands the impact before the polyurea coating 153. When an impact occurs, the protective shield itself deforms or breaks to absorb the impact energy, rather than directly transmitting the impact force to the surface of the column 14.

[0103] For example, the protective cover is disposed close to the column 14 to act as a sacrificial shield to absorb the energy of the initial impact during hoisting or handling. When impacted, the protective cover remains in place close to the column 14, without displacement or collapse, and remains in the protective position.

[0104] For example, a buffer gap is provided between the protective cover and the column 14. Optionally, an elastic buffer is provided in the buffer gap between the protective cover and the outer surface of the column 14. Upon impact, the elastic buffer is compressed to absorb energy, further reducing the peak impact force transmitted to the column 14.

[0105] The protective cover is a disposable structure, for example, a wooden cover. Alternatively, the protective cover can be reused. For example, a metal cover can withstand external impacts and reduce the risk of deformation of column 14.

[0106] For example, the column 14 is divided into a first protective area 161, a second protective area 162, and a third protective area 163 along its length from top to bottom. The first protective area 161 and the third protective area 163 are provided with a polyurea coating 153. The dry film thickness of the polyurea coating 153 in the second protective area 162 is less than that in the first and third protective areas 161 and 163. A protective cover is provided in the third protective area 163. Thus, the first and third protective areas 161 and 163 are protected by the thicker polyurea coating 153, while the second protective area 162 is protected by both the thinner polyurea coating 153 and the protective cover. Alternatively, a polyurea coating 153 can be applied to the first protective zone 161 and the third protective zone 163. The dry film thickness of the polyurea coating 153 applied to the second protective zone 162 is less than the dry film thickness of the polyurea coating 153 in the first protective zone 161 and the third protective zone 163. The protective cover then covers the first protective zone 161, the second protective zone 162, and the third protective zone 163. Thus, the protection level of each protective zone is improved through the dual protection of the protective cover and the protective film 15.

[0107] The energy storage device 1000 provided in this application embodiment forms a physical protection layer on the outside of the protective film 15 by setting a protective cover on the outside of the column 14, so that the polyurea coating 153 is protected from direct impact and friction, and the wear rate of the protective film 15 is slowed down.

[0108] In some embodiments of this application, the protective cover is a wooden cover or an elastic cover.

[0109] For example, the protective cover is a wooden cover, which is fixed to the outside of the box 100 by bolts.

[0110] For example, the protective cover is a rubber or polyurethane structural component, which is fixed to the outer surface of the column 14 by straps or cable ties. The protective cover is an elastic cover that can directly contact the protective film 15, reducing wear on the polyurea coating 153 during transportation and external impact, and extending the service life of the protective film 15.

[0111] In some embodiments of this application, the outer surface of the side plate 12 is also provided with a protective cover. The protective cover provided on the side plate 12 and the protective cover provided on the outside of the column 14 can be made of the same material or different materials. Optionally, the thickness of the protective cover provided on the side plate 12 is less than the thickness of the protective cover provided on the outside of the column 14.

[0112] In some embodiments of this application, a corner piece 17 is connected between the corner of the top protective member 11 and the top of the column 14, and a protective film 15 is provided on the surface of the corner piece 17.

[0113] Corner fitting 17 is made of cast steel and is used to connect lifting equipment, facilitating the handling and stacking of the energy storage device 1000.

[0114] For example, each of the four corners of the top protective member 11 is provided with a corner piece 17 connected to the column 14. A protective film 15 is provided on the surface of each corner piece 17.

[0115] The durability of the corner piece 17 is improved by providing a protective film 15 on the surface of the corner piece 17.

[0116] In some embodiments of this application, the top of the box 100 is provided with at least six corner pieces 17, and the top protective member 11 is provided with at least one reinforcing beam 18, wherein four corner pieces 17 are located at the four top corners of the box 100, and the other at least two corner pieces 17 are located on the reinforcing beam 18.

[0117] The number of corner pieces 17 can be six, seven, or eight, etc. Optionally, each corner piece 17 has a protective film 15 on its surface. For example, as shown... Figure 1 As shown, the top of the box 100 is provided with six corner pieces 17, and a reinforcing beam 18 is provided in the middle of the top protective member 11. Four corner pieces 17 are located at the four corners of the top of the box 100, and the other two corner pieces 17 are arranged at both ends of the reinforcing beam 18. Thus, the six corner pieces 17 cooperate with the hoisting equipment to form a six-point lifting mechanism. Exemplarily, the top of the box 100 is provided with seven corner pieces 17, and a reinforcing beam 18 is provided in the middle of the top protective member 11. Four corner pieces 17 are located at the four corners of the top of the box 100, and the other three corner pieces 17 are arranged on the reinforcing beam 18 at equal intervals.

[0118] The device includes one or more reinforcing beams 18. For example, two reinforcing beams 18 are provided, spaced equally from the sides of the box body 100 extending along the direction of the reinforcing beams 18. A corner piece 17 is provided in the middle of each reinforcing beam 18; alternatively, a corner piece 17 is provided at each end of each reinforcing beam 18. By providing reinforcing beams 18, the number of lifting connection points of the box body 100 is increased, reducing the swaying amplitude of the box body 100 during lifting.

[0119] The energy storage device 1000 provided in this application embodiment is provided with at least six corner pieces 17. Compared with the traditional four-point lifting method, the connection points between the lifting rope and the box 100 are increased from four to at least six, so that the force on each connection point is more uniform, the left and right swaying amplitude of the box 100 during the lifting process is smaller, the probability of collision with adjacent boxes or obstacles is reduced, and the chance of the protective film 15 being bumped is reduced.

[0120] In some embodiments, a cushioning pad is installed at the corner fitting 17. Optionally, the cushioning pad is a wooden pad or a flexible pad, etc. For example, the cushioning pad is a rubber pad, which is glued and fixed at the corner fitting 17. The thickness of the cushioning pad is 4-6mm, for example, the thickness of the cushioning pad is 4mm, 6mm, or any value between 4mm and 6mm such as 4.2mm, 4.5mm, 4.7mm, 5mm, etc.

[0121] In some embodiments of this application, the housing 100 further includes a bottom crossbeam connected to the bottom protective member 13, with both ends of the bottom crossbeam connected to the uprights 14. The thickness of the bottom crossbeam is 5mm to 12mm.

[0122] The thickness of the bottom crossbeam refers to the dimension of the bottom crossbeam along the length of the column 14. The thickness of the bottom crossbeam is any value between 5mm and 12mm, such as 5mm, 12mm, 6mm, 7mm, 10mm, or 11mm.

[0123] In some embodiments, the thickness of the bottom crossbeam is 8 mm to 10 mm. For example, the thickness of the bottom crossbeam is any value between 8 mm and 10 mm, such as 8 mm, 10 mm, 8.4 mm, 9 mm, or 9.6 mm.

[0124] Typically, the thickness of the bottom crossbeam is 3mm. In the energy storage device 1000 provided in this application, the thickness of the bottom crossbeam is 5mm to 12mm. Increasing the thickness of the bottom crossbeam increases the structural mass of the bottom of the housing 100, causing the overall mass distribution of the housing 100 to shift downwards. This reduces the swaying amplitude during transportation and hoisting, lowering the probability of collisions and the risk of damage to the protective membrane 15. Furthermore, increasing the thickness of the bottom crossbeam also enhances the load-bearing capacity of the housing 100, better supporting the battery device 200. When multiple layers of the housing 100 are stacked, the bottom crossbeam needs to withstand the pressure of the upper layers of housing 100; the increased thickness improves its bending resistance, reducing deformation.

[0125] In some embodiments of this application, the housing 100 further includes a support beam 19 for supporting the battery device 200. The support beam 19 is fixedly connected to the column 14 or the side plate 12, and the distance between the support beam 19 and the bottom protective member 13 is H, where 200mm≤H≤500mm.

[0126] The support beam 19 is located inside the housing 100 and is fixedly connected to the column 14 or the side plate 12 for installing and supporting the battery device 200. For example, the support beam 19 is provided with a positioning groove or guide, etc., which provides an accurate position for the battery device 200 within the housing 100, reducing displacement and impact to the battery device 200 during transportation.

[0127] Multiple support beams 19 can be provided along the length of the column 14. The distance H between the support beam 19 and the bottom protective member 13 refers to the minimum distance between the multiple support beams 19 and the bottom protective member 13. That is, the distance between the bottommost support beam 19 and the bottom protective member 13.

[0128] Typically, the distance between the support beam and the bottom protective component is 500mm to 800mm. The energy storage device 1000 provided in this application reduces the installation height of the support beam 19, thereby lowering the installation position of the battery device 200 and ultimately reducing the overall center of gravity of the housing 100, thus reducing the swaying amplitude of the housing 100 during hoisting and transportation.

[0129] 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.

[0130] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device 200 via piping to regulate the temperature of the individual battery cells.

[0131] 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.

[0132] As an example, the master control module can serve as the battery management unit for an energy storage device, used to monitor and manage the device. The master control module can monitor information such as the 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 master 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.

[0133] 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.

[0134] As an example, the power distribution unit can be used to distribute power to the power modules of the energy storage device.

[0135] like Figure 5As shown in the figure, this application embodiment also provides an energy storage system, including an energy conversion system 2000 and an energy storage device 1000 as described above. The energy conversion system 2000 is connected to the energy storage device 1000 to perform energy conversion on the current input to the energy storage device 1000 or output from the energy storage device.

[0136] The energy storage system provided in this application embodiment can be any power system that requires the use of energy storage device 1000.

[0137] In some embodiments, the energy storage system may include one or more energy storage devices 1000 and a power conversion system 2000 (PCS). The power conversion system 2000 is used to connect the power generation device 3000, the power grid, or a load to the energy storage device 1000. The power generation device 3000 generates electrical energy, the energy storage device 1000 stores electrical energy, and the power conversion system 2000 converts the current input to the energy storage device 1000 or the current output from the energy storage device. The electrical energy generated by the power generation device 3000 can be stored in the energy storage device 1000 through the power conversion system 2000, and the electrical energy stored in the energy storage device 1000 can also be output to the load or the power grid through the power conversion system 2000. As an example, the power generation device 3000 may specifically be a solar panel, a hydroelectric power generation device, a thermal power generation device, a wind power generation device, etc. The specific type of power generation device is not limited in this application.

[0138] like Figure 6 As shown, this application embodiment also provides a charging network, including a charging pile 4000 and an energy storage device 1000 as described above. The charging pile 4000 is electrically connected to the energy storage device 1000, and the energy storage device 1000 is used to provide power to the charging pile 4000.

[0139] The charging pile 4000 is electrically connected to the battery device 200 in the energy storage device 1000 via a cable. The battery device 200 can provide the charging pile 4000 with its stored electrical energy. The charging pile 4000 has one or more connectors 5000 for connecting to electrical equipment (such as vehicles) to replenish the power of the electrical equipment.

[0140] The energy storage device 1000 can be located inside the charging pile 4000 (e.g., an integrated energy storage and charging unit) or outside the charging pile 4000.

[0141] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An energy storage device, characterized in that, The device includes a housing and a battery assembly disposed within the housing. The housing includes a top protective member, side panels, a bottom protective member, and uprights. The top of the uprights is connected to the top protective member, and the bottom of the uprights is connected to the bottom protective member. In the circumferential direction perpendicular to the height of the housing, the side panels are disposed between adjacent uprights. The outer surface of the column is provided with a protective film, which includes a protective layer, a shielding layer and a polyurea coating arranged sequentially from the inside to the outside.

2. The energy storage device as described in claim 1, characterized in that, The protective layer is an epoxy zinc-rich layer; and / or, the shielding layer is an epoxy micaceous iron oxide layer.

3. The energy storage device as described in claim 1, characterized in that, The dry film thickness of the protective layer is greater than 60 μm and not more than 80 μm, and / or the dry film thickness of the shielding layer is greater than 210 μm and not more than 300 μm, and / or the dry film thickness of the polyurea coating is 1.5 mm to 3.0 mm.

4. The energy storage device as described in claim 1, characterized in that, The column is divided into multiple protective zones along its length, and the dry film thickness of the polyurea coating varies in different protective zones.

5. The energy storage device as described in claim 4, characterized in that, The column is divided into a first protective zone, a second protective zone, and a third protective zone from top to bottom along its length; wherein the dry film thickness of the polyurea coating on the surface of the first protective zone and the third protective zone is greater than the dry film thickness of the polyurea coating on the surface of the second protective zone.

6. The energy storage device as described in claim 5, characterized in that, The dry film thickness of the polyurea coating on the surface of the third protective zone is greater than the dry film thickness of the polyurea coating on the surface of the first protective zone.

7. The energy storage device as described in claim 1, characterized in that, The protective film is provided on the surface of the side plate, wherein the dry film thickness of the polyurea coating on the surface of the column is greater than the dry film thickness of the polyurea coating on the surface of the side plate.

8. The energy storage device as described in claim 1, characterized in that, The outer side of the column is equipped with a removable protective cover.

9. The energy storage device as described in claim 8, characterized in that, The protective cover is a wooden cover or an elastic cover.

10. The energy storage device as described in claim 8, characterized in that, There is a buffer gap between the protective cover and the column.

11. The energy storage device as claimed in claim 1, characterized in that, A corner piece is connected between the top of the column and the corner of the top protective member, and the surface of the corner piece is provided with a protective film.

12. The energy storage device as described in claim 1 or 11, characterized in that, The top of the box is provided with at least six corner pieces, and the top protective member is provided with at least one reinforcing beam, wherein four of the corner pieces are located at the four top corners of the box, and the other at least two corner pieces are located on the reinforcing beam.

13. The energy storage device as claimed in claim 1, characterized in that, The enclosure also includes a bottom crossbeam connected to the bottom protective component. Both ends of the bottom crossbeam are connected to the uprights. The thickness of the bottom crossbeam is 5mm to 12mm.

14. The energy storage device as claimed in claim 1, characterized in that, The housing also includes a support beam for supporting the battery device. The support beam is fixedly connected to the column or the side plate. The distance between the support beam and the bottom protective component is H, where 200mm≤H≤500mm.

15. An energy storage system, characterized in that, It includes an energy conversion system and an energy storage device as described in any one of claims 1 to 14, wherein the energy conversion system is connected to the energy storage device to convert the current input to or output from the energy storage device into energy.

16. 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 14 or an energy storage system as described in claim 15, wherein the energy storage device is used to provide electrical energy to the charging pile.

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