Energy storage device and energy storage system

Abstract

The embodiment of the utility model discloses an energy storage device and an energy storage system, the energy storage device comprises an outer box body and a battery device, the outer box body comprises a top wall, a bottom wall and a peripheral side wall connecting the top wall and the bottom wall; the battery device is accommodated in the outer box body; an air inlet part is arranged at the lower end of the bottom wall and / or the peripheral side wall of the outer box body in the gravity direction, an air outlet part is arranged at the upper end of the top wall and / or the peripheral side wall of the outer box body in the gravity direction, the air inlet part is used for natural air to enter the energy storage device, the air inlet part comprises a first partition plate, and the first partition plate comprises a plurality of through holes penetrating through the first partition plate. Therefore, the operation and maintenance cost of the energy storage device can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of energy storage, and more particularly, to an energy storage device and an energy storage system. BACKGROUND

[0002] The battery device contained in the energy storage device has a need for heat dissipation. Currently, the energy storage device usually adopts a liquid cooling method to dissipate heat of the battery device. However, the liquid cooling method needs to consume a large amount of energy on the one hand, and the liquid cooling system needs many components and is complex to install, thereby increasing the operation and maintenance cost of the energy storage device.

[0003] Therefore, how to reduce the operation and maintenance cost of the energy storage device becomes a problem to be solved. CONTENT OF THE INVENTION

[0004] The embodiments of the present application provide an energy storage device and an energy storage system, which can reduce the operation and maintenance cost of the energy storage device.

[0005] In a first aspect, an energy storage device is provided, comprising an outer box body and a battery device. The outer box body comprises a top wall, a bottom wall and a circumferential side wall connecting the top wall and the bottom wall. The battery device is contained in the outer box body. The bottom wall and / or the lower end of the circumferential side wall in the direction of gravity of the outer box body is provided with an air inlet part. The top wall and / or the upper end of the circumferential side wall in the direction of gravity of the outer box body is provided with an air outlet part. The air inlet part is used for natural wind to enter the energy storage device. The air inlet part comprises a first partition plate. The first partition plate comprises a plurality of through holes penetrating the first partition plate.

[0006] In the technical scheme provided by the embodiments of the present application, the air inlet part is arranged at the lower part of the energy storage device, and the air outlet part is arranged at the upper part of the energy storage device. The natural wind with low temperature can enter the energy storage device through the air inlet part. Since the gas with low temperature has a large density, the heat generated by the battery device during operation is lifted to the air outlet part by the natural wind with low temperature. Thus, the natural wind cooling of the energy storage device can be realized, and the energy consumption and the installation complexity can be saved. Therefore, the operation and maintenance cost of the energy storage device can be reduced.

[0007] In some embodiments, the air inlet part comprises a first partition plate. The first partition plate comprises a plurality of through holes penetrating the first partition plate.

[0008] In the technical scheme provided by the embodiments of the present application, the plurality of through holes are arranged in the first partition plate. When the water vapor in the natural wind passes through the through holes, a part of the water vapor can be condensed. Thus, the amount of water vapor entering the energy storage device can be reduced, and the risk of condensation of water vapor on the surface of the battery device during the natural wind cooling process can be reduced. Therefore, the reliability of the energy storage device can be improved.

[0009] In some embodiments, the surface of the first partition plate away from the inside of the outer box body is provided with a hydrophobic material.

[0010] In the technical scheme provided by the embodiment of the present application, the surface of the first partition plate away from the inside of the outer box body is provided with a hydrophobic material, so that the water vapor in the cold air passing through the air inlet part can be blocked by the hydrophobic material, thereby reducing the amount of water vapor flowing into the energy storage device through natural wind, and further reducing the influence of natural wind cooling on the battery device in the energy storage device, thereby improving the reliability of the energy storage device.

[0011] In some embodiments, the surface of the first partition plate facing the inside of the outer box body is provided with a hydrophilic material.

[0012] In the technical scheme provided by the embodiment of the present application, the surface of the first partition plate away from the inside of the outer box body is provided with a hydrophobic material, and the surface of the first partition plate facing the inside of the outer box body is provided with a hydrophilic material, on the one hand, external water vapor is difficult to enter the energy storage device due to the hydrophobic material, and on the other hand, the water vapor in the energy storage device is more likely to condense at the air inlet, thereby greatly reducing the water vapor content in the energy storage device, and further improving the reliability of the energy storage device.

[0013] In some embodiments, the air outlet part includes a second partition plate, and the second partition plate includes a plurality of through holes penetrating through the second partition plate.

[0014] In the technical scheme provided by the embodiment of the present application, a plurality of through holes are opened in the second partition plate, so that part of the water vapor carried in the natural wind can condense when passing through the through holes, thereby reducing the amount of water vapor entering the energy storage device, and further reducing the risk of water vapor condensing on the surface of the battery device during the natural wind cooling process, thereby improving the reliability of the energy storage device.

[0015] In some embodiments, the surface of the second partition plate facing the inside of the outer box body is provided with a hydrophilic material.

[0016] In the technical scheme provided by the embodiment of the present application, the surface of the second partition plate facing the inside of the outer box body is provided with a hydrophilic material, so that the water vapor in the energy storage device is more likely to condense at the air outlet, thereby reducing the water vapor content in the energy storage device and reducing the influence of the condensed water on the battery device, thereby improving the reliability of the energy storage device.

[0017] In some embodiments, the surface of the second partition plate away from the inside of the outer box body is provided with a hydrophobic material.

[0018] In the technical scheme provided by the embodiment of the present application, the surface of the second partition plate away from the inside of the outer box body is provided with a hydrophobic material, so that even when the air flow rate at the air outlet part is small, the amount of water vapor entering the energy storage device through the air outlet part is also small, thereby reducing the water vapor content in the energy storage device, and further improving the reliability of the energy storage device.

[0019] In some embodiments, the energy storage device further comprises a collecting portion configured to collect water vapor from a surface of the air inlet portion facing the interior of the outer box and / or a surface of the air outlet portion facing the interior of the outer box; and a draining portion connected to the collecting portion and configured to drain the water vapor collected by the collecting portion out of the energy storage device.

[0020] In some embodiments, the energy storage device further comprises a fan disposed at a side of the air inlet portion close to the interior of the outer box and / or a side of the air outlet portion close to the interior of the outer box.

[0021] In the technical scheme provided by the embodiments of the present application, the fan is disposed at the side of the air inlet portion close to the interior of the outer box and / or the side of the air outlet portion close to the interior of the outer box, so that sufficient flow power can be provided for air circulation in the energy storage device even when the temperature difference between the air outlet portion and the air inlet portion is small, the cooling efficiency of the battery device is maintained, and the stability of the energy storage device is improved.

[0022] In some embodiments, the energy storage device further comprises a plurality of inner side walls accommodated in the outer box and spaced apart from each other; and a bracket disposed on opposite surfaces of the plurality of inner side walls and configured to support the battery device; wherein the battery device is in direct contact with the bracket or connected to the bracket through a heat-conducting medium.

[0023] In the technical scheme provided by the embodiments of the present application, the battery device in the energy storage device is in direct contact with the bracket or connected to the bracket through a heat-conducting medium, so that the heat generated by the battery device can be transmitted to the outside through the structural members of the energy storage device, the cooling efficiency of the battery device is improved, and the reliability of the energy storage device is improved.

[0024] In some embodiments, at least part of the battery device is arranged along the direction of gravity.

[0025] In some embodiments, the battery device comprises a box; and a plurality of battery monomers accommodated in the box; wherein a heat-conducting medium is disposed between the plurality of battery monomers and the bottom surface of the box, and the battery monomers are connected to the bottom surface of the box through the heat-conducting medium.

[0026] In the technical scheme provided by the embodiments of the present application, the heat-conducting medium is disposed between the battery monomers and the bottom surface of the box of the battery device, so that the heat generated by the battery monomers can be more efficiently transmitted to the surface of the battery device, and the heat can be exchanged with the structural members of the energy storage device or the air in the energy storage device through the surface of the battery device, so that the temperature of the battery monomers can be reduced more quickly. Thus, the reliability of the energy storage device is improved.

[0027] In some embodiments, an opening is provided at the top of the box of the battery device.

[0028] In the technical scheme provided in the embodiment of the present application, the top of the box of the battery device is provided with an opening, air can circulate through the top opening of the battery device, so that the heat generated by the battery monomer in the battery device can be taken away faster.

[0029] In a second aspect, there is provided an energy storage system comprising an energy storage device as in any of the first aspects. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 A schematic diagram of an energy storage device provided by an embodiment of the present application is shown;

[0031] Figure 2 A partial structural schematic diagram of a battery device of an embodiment of the present application is shown;

[0032] Figure 3 A schematic diagram of an air inlet or air outlet of an energy storage device provided by an embodiment of the present application is shown;

[0033] Figure 4 A schematic diagram of a first partition in an embodiment of the present application is shown;

[0034] Figure 5 A schematic diagram of a first partition in another embodiment of the present application is shown;

[0035] Figure 6 A schematic diagram of a second partition in an embodiment of the present application is shown;

[0036] Figure 7 A schematic diagram of a second partition in another embodiment of the present application is shown;

[0037] Figure 8 A schematic diagram of an energy storage device provided by another embodiment of the present application is shown;

[0038] Figure 9 A schematic diagram of an energy storage device provided by still another embodiment of the present application is shown;

[0039] Figure 10 A schematic diagram of an energy storage device provided by other embodiments of the present application is shown.

[0040] REFERENCE SIGNS:

[0041] 1 - energy storage device; 10 - battery device; 1001 - inner side wall; 1002 - bracket; 11 - box body; 12 - outer box body; 121 - top wall; 122 - bottom wall; 123 - circumferential side wall; 111 - first box body part; 112 - second box body part; 20 - battery cell; 2000 - through hole; 210 - air inlet part; 2100 - hydrophobic material; 2101 - first partition; 220 - air outlet part; 2200 - hydrophilic material; 2201 - second partition; 240 - collection part; 250 - drainage part; 260 - support structure; 270 - fan. DETAILED DESCRIPTION

[0042] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0043] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, rather than to describe a particular order or primary and secondary relationship.

[0044] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0045] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection", "attach" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] The term "and / or" in the present application is only used to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent the three cases of A existing alone, A and B existing together, and B existing alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0047] In the embodiments of the present application, the same reference signs represent the same components, and for the sake of brevity, the detailed description of the same components is omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length, width and other dimensions of the integrated device are only exemplary and should not constitute any limitation on the present application.

[0048] "Multiple" appearing in the present application means two or more (including two), and similarly, "multiple groups" means two or more groups (including two groups), and "multiple pieces" means two or more pieces (including two pieces).

[0049] If not specifically stated, all embodiments and optional embodiments of the present application can be combined with each other to form new technical solutions.

[0050] In the embodiments of the present application, the battery monomer can be a secondary battery, which refers to a battery monomer that can be activated by charging after discharging to continue to use.

[0051] The battery monomer can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited thereto.

[0052] The battery device mentioned in the embodiments of the present application can include one or more battery monomer assemblies for providing voltage and capacity. The battery monomer assembly can include a plurality of battery monomers connected in series, in parallel or in mixed connection through a busbar component.

[0053] In some embodiments, the battery monomer assembly is usually formed by arranging a plurality of battery monomers.

[0054] As an example, the battery monomer assembly can be a battery module formed by arranging and fixing a plurality of battery monomers into an independent module. As an example, the battery module can be formed by bundling a plurality of battery monomers with a cable tie.

[0055] In some embodiments, the battery device can be a battery pack, which includes a box body and one or more battery monomer assemblies, and the battery monomer assemblies are accommodated in the box body.

[0056] As an example, the battery cell assembly can be a battery module. The battery cell assembly can be housed in the cabinet by fixing the battery module in the cabinet.

[0057] As an example, the battery cell assembly can also be housed in the cabinet by fixing a plurality of battery cells directly in the cabinet.

[0058] As an example, the cabinet can include a first cabinet and a second cabinet. The first cabinet and the second cabinet are buckled so that an enclosed space is formed inside the cabinet to accommodate the battery cell assembly. Here, the enclosed means covered or closed, which can be sealed or unsealed. The first cabinet can be a top cover or a bottom plate.

[0059] As an example, the cabinet can include a top cover, a frame and a bottom plate. The top cover and the bottom plate are connected with the frame respectively, so that an enclosed space is formed inside the cabinet to accommodate the battery cell assembly.

[0060] Embodiments of the present application provide a kind of energy storage device, including one or more battery clusters to improve the voltage and capacity of energy storage device. The battery cluster can include a plurality of battery devices, a plurality of battery devices are connected in series by busbar component to improve the voltage of energy storage device. When the energy storage device includes a plurality of battery clusters, a plurality of battery clusters are connected in parallel to improve the capacity of energy storage device.

[0061] The energy storage device can be used in energy storage power station, wind power system, solar power system, mobile power system or temporary power supply system, etc. The energy storage device can store electrical energy as needed and output electrical energy at appropriate time. For example, the energy storage device can store electrical energy during low electricity consumption, and provide electrical energy for related users or electrical equipment during electricity peak. The energy storage system provided by embodiments of the present application can be any power system that needs to use energy storage device.

[0062] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0063] In some embodiments, the energy storage device can include a cabinet body and one or more battery clusters, and the battery cluster is housed in the cabinet body.

[0064] In some embodiments, the energy storage device can include a master control module, a general control module, a power distribution module and a fire-fighting module.

[0065] As an example, the master control module can be used as a battery management unit of the battery cluster for monitoring and managing the battery cluster. The master control module can monitor the current, voltage, power or temperature information of the battery cluster. For example, the charge and discharge current and voltage of the battery cluster can be controlled. The master control module includes a slave battery management unit (SBMU), a fusion switch and other modules.

[0066] As an example, the master control module can be used as a battery management unit of the energy storage device to monitor and manage the energy storage device. The master control module can monitor information such as current, voltage, power, state of charge, or temperature of the energy storage device. For example, the charging and discharging current, voltage, etc. of the energy storage device can be controlled. As an example, the master control module includes an insulation monitoring module IMM (Insulation Monitoring Module, IMM), a master battery management unit MBMU (Master Battery Management Unit, MBMU), an Ethernet ETH (EtherNet, ETH), and an optical fiber conversion module.

[0067] As an example, the power distribution device can be used to distribute power to the energy storage device power module.

[0068] In some embodiments, the energy storage system can include one or more energy storage devices and a power conversion system (PCS) for connecting between a power generation device and the energy storage device. The power generation device is used to generate electric energy, and the electric energy generated by the power generation device can be stored in the energy storage device through the power conversion system. As an example, the power generation device can 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 the present application.

[0069] At present, from the development of market situation, the application of power battery is more and more widely. Power battery is not only applied to energy storage power supply system such as hydroelectric, thermal, wind and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of power battery, the market demand is also increasing.

[0070] The battery device contained in the energy storage device has the need for heat dissipation. At present, the energy storage device usually adopts liquid cooling method to dissipate heat for the battery device. However, the liquid cooling method needs to consume a large amount of energy on the one hand, and the liquid cooling system needs many components and the installation is complex, thereby increasing the operation and maintenance cost of the energy storage device.

[0071] Therefore, how to reduce the operation and maintenance cost of the energy storage device becomes a problem to be solved.

[0072] The energy storage device provided by the embodiment of the present application includes an outer box body and a battery device. The outer box body includes a top wall, a bottom wall, and a circumferential side wall connecting the top wall and the bottom wall. The battery device is contained in the outer box body. The bottom wall and / or the lower end of the circumferential side wall in the direction of gravity is provided with an air inlet part, and the top wall and / or the upper end of the circumferential side wall in the direction of gravity is provided with an air outlet part.

[0073] In the technical scheme provided by the embodiment of the application, the lower part of the energy storage device is provided with an air inlet part, and the upper part of the energy storage device is provided with an air outlet part. The natural air with a low temperature can enter the energy storage device through the air inlet part. Because the gas with a low temperature has a large density, the heat generated by the battery device in the energy storage device is lifted to the air outlet part by the natural air with a low temperature, so that the natural air cooling the energy storage device can be realized, and then the energy consumption and the installation complexity can be saved. Therefore, the operation and maintenance cost of the energy storage device can be reduced.

[0074] For example, Figure 1 A schematic diagram of an energy storage device 1 provided by an embodiment of the application is shown.

[0075] The energy storage device 1 provided by the embodiment of the application can include a plurality of battery compartments, and the plurality of battery compartments can accommodate a plurality of battery devices 10. For example, the battery compartments can be provided with a plurality of battery device 10 mounting positions along the gravity direction to accommodate a plurality of battery devices 10. The battery devices 10 can be put into or taken out of the battery device 10 mounting positions of the battery compartments from the entrance. After the battery devices 10 are mounted to the battery device 10 mounting positions, the battery devices 10 can be fixed by a locking mechanism. The battery device 10 mounting position can include a bracket 1002 and two oppositely arranged inner side walls 1001. The bracket 1002 is used to carry the battery device 10. Two brackets 1002 are arranged at the same height on the two inner side walls 1001, respectively. Adjacent battery compartments can share the same inner side wall 1001.

[0076] The energy storage device 1 is provided with a plurality of battery compartments. The plurality of battery compartments can be provided with a shared inner side wall 1001, thereby forming a plurality of battery compartments, so that the battery devices 10 can be arranged in the energy storage device 1. In addition to the structure of the box body 11 of the energy storage device 1, no additional cabinet body needs to be arranged.

[0077] For example, the shape of the energy storage device 1 can be a cuboid, but the embodiment of the application is not limited thereto. The energy storage device 1 can also be of other shapes. In addition, in order to facilitate transportation and reduce transportation costs, the energy storage device 1 of the embodiment of the application can be a standard size container, for example, a 20-foot or 40-foot container, but the embodiment of the application is not limited thereto.

[0078] The energy storage device 1 can also include a master control module. For example, the master control module can serve as a battery management unit of a battery cluster, and is used to monitor and manage the battery cluster. The master control module can be used to accommodate a master control box, and the master control box is used to electrically connect the battery devices 10 in the battery compartments. The master control module can monitor the current, voltage, power or temperature of the battery cluster. For example, the charging and discharging current and voltage of the battery cluster can be controlled. The master control module includes an auxiliary battery management unit, a fusion switch and other modules.

[0079] The energy storage device 1 can further include an electrical module, which can include electrical components, such as at least one of the following components: a distribution box, an inverter, a master control box, and a fan.

[0080] The energy storage device 1 can further include a busbar module, which can include busbar components for electrical connection with the master control module. For example, high-voltage lines from the master control module can be connected to the busbar components through wire slots at the bottom of the box 11, such as to achieve parallel connection between multiple master control boxes.

[0081] The above is only exemplary, and the energy storage device 1 can include more components than the above examples or can lack some components of the above examples, which are not limited in the embodiments of the present application.

[0082] For example, Figure 2 A partial structural schematic diagram of the battery device 10 of the embodiments of the present application is shown. As shown in Figure 2 The battery device 10 of the embodiments of the present application can include multiple battery monomers 20 to meet different power requirements. The shape of the battery monomer 20 of the embodiments of the present application can be set according to actual application. For example, the battery monomer 20 can be prismatic as shown in Figure 2 , or can be cylindrical or other shapes as shown in Figure 2 , which are not limited in the embodiments of the present application.

[0083] It should be understood that, as shown in Figure 2 , the battery device 10 of the embodiments of the present application can further include a box 11, which can be used to accommodate multiple battery monomers 20. The box 11 of the embodiments of the present application is hollow inside, and multiple battery monomers 20 are accommodated in the box 11. The box 11 can include two parts, which are referred to as the first box part 111 and the second box part 112, respectively, and the first box part 111 and the second box part 112 are buckled together. The shape of the first box part 111 and the second box part 112 can be determined according to the shape of the components accommodated inside, for example, according to the shape of the combination of multiple battery monomers 20, and at least one of the first box part 111 and the second box part 112 has an opening. For example, as shown in Figure 2 , the first box part 111 and the second box part 112 can both be hollow cuboids and each have an open face, the openings of the first box part 111 and the second box part 112 are oppositely arranged, and the first box part 111 and the second box part 112 are buckled together to form a box 11 with a closed cavity, which can be used to accommodate multiple battery monomers 20. Multiple battery monomers 20 are placed in the box 11 formed by buckling the first box part 111 and the second box part 112 after being combined in parallel or in series or in a hybrid combination.

[0084] For example, unlike Figure 2 As shown, either the first housing portion 111 or the second housing portion 112 may have only one hollow cuboid with an opening, while the other is plate-shaped to cover the opening. Taking the second housing portion 112 as a hollow cuboid with one opening and the first housing portion 111 as a plate-shaped example, then the first housing portion 111 covers the opening of the second housing portion 112 to form a housing 11 with a closed chamber, which can be used to accommodate multiple battery cells 20.

[0085] The housing 11 of the battery device 10 may also have only a first housing portion 111, which has an opening to facilitate the heat dissipation of the battery cells 20 housed therein.

[0086] refer to Figure 1 And further combine Figure 3 This application describes the energy storage device 1 provided in the embodiments.

[0087] Figure 3 A schematic diagram of the air inlet 210 or air outlet 220 of the energy storage device 1 provided in a certain embodiment of this application is shown.

[0088] This application provides an energy storage device 1, including an outer casing 12 and a battery device 10. The outer casing 12 includes a top wall 121, a bottom wall 122, and a peripheral side wall 123 connecting the top wall 121 and the bottom wall 122. The battery device 10 is housed within the outer casing 12. An air inlet 210 is provided at the lower end of the bottom wall 122 and / or the peripheral side wall 123 of the outer casing 12 along the direction of gravity, and an air outlet 220 is provided at the upper end of the top wall 121 and / or the peripheral side wall 123 of the outer casing 12 along the direction of gravity.

[0089] The top wall 121 of the outer casing 12 can be the wall of the energy storage device 1 located above the direction of gravity, and the bottom wall 122 of the outer casing 12 can be the wall of the energy storage device 1 located below the direction of gravity.

[0090] The air inlet 210 can be disposed on the bottom wall 122 of the energy storage device 1. For example, when the energy storage device 1 is lifted by the support structure 260, the air inlet 210 on the bottom wall 122 allows natural wind to enter the energy storage device 1 through the air inlet 210 on the bottom wall 122, thereby lifting the hot air inside the energy storage device 1. The air inlet 210 can also be disposed on the lower part of the peripheral side wall 123, for example... Figure 1 In the middle, the lower part of the peripheral sidewall 123 is provided with an air inlet 210 to allow cold air to enter.

[0091] The air inlet portion 210 can be an opening arranged at the lower part of the bottom wall 122 or the peripheral wall 123. The air inlet portion 210 can also be a porous partition plate arranged at the lower part of the bottom wall 122 or the peripheral wall 123. The partition plate can be integrated with the outer box 12, or the partition plate can be arranged separately. The embodiments of the present application are not limited in this regard.

[0092] The air outlet portion 220 can be arranged at the top wall 121 of the energy storage device 1. The air outlet portion 220 can also be arranged at the upper part of the peripheral wall 123 of the energy storage device 1. For example, Figure 1 In some embodiments, the upper part of the peripheral wall 123 is provided with the air outlet portion 220 for the hot air in the energy storage device 1 to flow out.

[0093] The air outlet portion 220 can be an opening arranged at the upper part of the top wall 121 or the peripheral wall 123. The air inlet portion 210 can also be a porous partition plate arranged at the lower part of the bottom wall 122 or the peripheral wall 123. The partition plate can be integrated with the outer box 12, or the partition plate can be arranged separately. The embodiments of the present application are not limited in this regard.

[0094] Since the cold air has a larger density and the hot air has a smaller density, the cold air usually sinks to the lower part. The air inlet portion 210 arranged at the lower part of the outer box 12 can guide the cold air into the energy storage device 1. Then, the heat generated by the battery device 10 in the energy storage device 1 is lifted by the "chimney effect" of the hot air, and is further discharged through the air outlet portion arranged at the upper part of the outer box 12. Thus, the natural wind circulation can be used to cool the energy storage device 1.

[0095] In the technical solutions provided by the embodiments of the present application, the air inlet portion 210 is arranged at the lower part of the energy storage device 1, and the air outlet portion 220 is arranged at the upper part of the energy storage device 1. The natural wind with a lower temperature can enter the energy storage device 1 through the air inlet portion 210. Since the gas with a lower temperature has a larger density, the heat generated by the battery device 10 in the energy storage device 1 is lifted to the air outlet portion 220 by the natural wind with a lower temperature. Thus, the natural wind can be used to cool the energy storage device 1, and the energy consumption and the installation complexity can be reduced. Therefore, the operation and maintenance cost of the energy storage device 1 can be reduced.

[0096] Further referring to Figure 3 , the air inlet portion 210 or the air outlet portion 220 provided by the embodiments of the present application is described.

[0097] In some possible embodiments, the air inlet portion 210 includes a first partition plate 2101, and the first partition plate 2101 includes a plurality of through holes 2000 penetrating the first partition plate 2101.

[0098] The first partition plate 2101 can be integrated with the outer box 12, or the first partition plate 2101 can be independent of the outer box 12.

[0099] During the process of cooling the energy storage device 1 by natural wind circulation, the external water vapor can be carried into the energy storage device 1 by the natural wind and further condense on the surface of the battery device 10, thereby possibly causing the risk of short circuit of the battery device 10.

[0100] By opening a plurality of through holes 2000 in the first baffle 2101, the airflow of the natural wind is accelerated when passing through the first baffle 2101, so that the water vapor therein condenses at the through holes 2000, thereby being able to reduce the amount of water vapor entering the energy storage device 1.

[0101] In the technical scheme provided by the embodiment of the present application, by opening a plurality of through holes 2000 in the first baffle 2101, a part of the water vapor carried in the natural wind can condense when passing through the through holes 2000, thereby being able to reduce the amount of water vapor entering the energy storage device 1, and further being able to reduce the risk of condensation of water vapor on the surface of the battery device 10 during the natural wind cooling process, thereby being able to improve the reliability of the energy storage device 1.

[0102] The following describes the first baffle 2101 in the energy storage device 1 provided by an embodiment of the present application in combination with Figure 4 and Figure 5

[0103] Figure 4 The schematic diagram of the first baffle 2101 in an embodiment of the present application is shown; Figure 5 The schematic diagram of the first baffle 2101 in another embodiment of the present application is shown.

[0104] In some possible embodiments, the surface of the first baffle 2101 away from the inside of the outer box 12 is provided with a hydrophobic material 2100.

[0105] The hydrophobic material 2100 is also called hydrophobic material, and the hydrophobic material 2100 can make water droplets difficult to wet the material surface. The contact angle between the material surface and water can be greater than 90°.

[0106] The hydrophobic material 2100 can be, for example, fluoride, silicone, fluorosilane, porous fiber membrane, polyurethane, and hexafluoropropylene, etc., and the embodiments of the present application are not limited thereto.

[0107] Since the first baffle 2101 is the air inlet part 210, the cold air enters from the surface away from the inside of the outer box 12, and the hydrophobic material 2100 is arranged on the surface of the first baffle 2101 away from the inside of the outer box 12. When the cold air carrying water vapor passes through the first baffle 2101, the water vapor is repelled by the hydrophobic material 2100 and moves away from the first baffle 2101. Therefore, the amount of water vapor entering the energy storage device 1 can be further reduced.

[0108] ​In the technical scheme provided by the embodiment of the present application, the surface of the first partition plate 2101 away from the inside of the outer box body 12 is provided with the hydrophobic material 2100, so that the water vapor in the cold air passing through the air inlet part 210 can be blocked by the hydrophobic material 2100, thereby reducing the amount of water vapor flowing into the energy storage device 1 through natural wind, and further reducing the influence of natural wind cooling on the battery device 10 in the energy storage device 1, thereby improving the reliability of the energy storage device 1.

[0109] In some possible embodiments, the surface of the first partition plate 2101 facing the inside of the outer box body 12 is provided with a hydrophilic material 2200.

[0110] The hydrophilic material 2200 has a lower solid-liquid interface energy and a smaller water drop wetting angle, and water vapor is easy to condense on the surface of the hydrophilic material 2200.

[0111] The hydrophilic material 2200 can be a material containing polar groups such as hydroxyl (-OH), carboxyl (-COOH), and amino (-NH2) in the molecule, which is easy to form hydrogen bonds with water. The hydrophilic material 2200 can also be a material with a hydrophilic wien structure.

[0112] The hydrophilic material 2200 can be, for example, silicate, polyvinylpyrrolidone (PVP), polyvinyl alcohol (PVA), and titanium dioxide, without being limited thereto in the embodiment of the present application.

[0113] In the technical scheme provided by the embodiment of the present application, the surface of the first partition plate 2101 away from the inside of the outer box body 12 is provided with the hydrophobic material 2100, and the surface of the first partition plate 2101 facing the inside of the outer box body 12 is provided with the hydrophilic material 2200, on the one hand, external water vapor is difficult to enter the energy storage device 1 due to the hydrophobic material 2100, and on the other hand, the water vapor in the energy storage device 1 is more likely to condense in the air inlet, thereby greatly reducing the water vapor content in the energy storage device 1, and thus improving the reliability of the energy storage device 1.

[0114] In combination with Figure 6 and Figure 7 The second partition plate 2201 in the energy storage device 1 provided by an embodiment of the present application is described.

[0115] Figure 6 A schematic diagram of the second partition plate 2201 in an embodiment of the present application is shown; Figure 7 A schematic diagram of the second partition plate 2201 in another embodiment of the present application is shown.

[0116] In some possible embodiments, the air outlet part 220 includes a second partition plate 2201, and the second partition plate 2201 includes a plurality of through holes 2000 penetrating the second partition plate 2201.

[0117] The second partition plate 2201 can be integrated with the outer box body 12, and the second partition plate 2201 can also be independent of the outer box body 12.

[0118] In the process of cooling the energy storage device 1 by natural wind circulation, the internal water vapor can gradually accumulate, thereby gradually exceeding the dew point, and then condensing into water droplets to cause damage to the electrical elements in the energy storage device 1.

[0119] By opening a plurality of through holes 2000 in the second partition plate 2201, the amount of water vapor entering the energy storage device 1 through the second partition plate 2201 can be reduced.

[0120] In the technical scheme provided by the embodiments of the present application, by opening a plurality of through holes 2000 in the second partition plate 2201, the water vapor carried by the natural wind can condense a part when passing through the through holes 2000, thereby reducing the amount of water vapor entering the energy storage device 1, and further reducing the risk of condensation of water vapor on the surface of the battery device 10 during the natural wind cooling process. Therefore, the reliability of the energy storage device 1 can be improved.

[0121] In some possible embodiments, the surface of the second partition plate 2201 facing the inside of the outer box body 12 is provided with a hydrophilic material 2200.

[0122] During use of the energy storage device 1, water vapor will gradually accumulate inside the energy storage device 1. When the humidity inside the energy storage device 1 accumulates to the dew point, the water vapor can condense on the surface of the battery device 10.

[0123] The surface of the second partition plate 2201 facing the inside of the outer box body 12 is provided with a hydrophilic material 2200. The water vapor in the energy storage device 1 is more likely to condense on the surface of the air outlet part 220 during flow, and is more likely to be carried away by the airflow flowing through the air outlet part 220, thereby reducing the water vapor content in the energy storage device 1.

[0124] In the technical scheme provided by the embodiments of the present application, the surface of the second partition plate 2201 facing the inside of the outer box body 12 is provided with a hydrophilic material 2200. The water vapor in the energy storage device 1 is more likely to condense on the surface of the air outlet part 220 during flow, and is more likely to be carried away by the airflow flowing through the air outlet part 220, thereby reducing the water vapor content in the energy storage device 1. The influence of the condensed water on the surface of the battery device 10 on the battery device 10 can be reduced, thereby improving the reliability of the energy storage device 1.

[0125] In some possible embodiments, the surface of the second partition plate 2201 away from the inside of the outer box body 12 is provided with a hydrophobic material 2100.

[0126] When the air flow rate at the air outlet 220 is not large, the outer side of the air outlet 220 can also need to be subjected to certain hydrophobic treatment. For example, when the battery device 10 produces low heat, the temperature difference between the air outlet 220 and the air inlet 210 is small, and the water vapor outside the air outlet 220 can enter the energy storage device 1 through the air outlet 220.

[0127] The surface of the second partition plate 2201 away from the inside of the outer box 12 is provided with the hydrophobic material 2100, so that even when the air flow rate at the air outlet 220 is small, the surface of the second partition plate 2201 away from the inside of the outer box 12 can reduce a part of the water vapor entering the energy storage device 1.

[0128] In the technical scheme provided in the embodiments of the present application, the surface of the second partition plate 2201 away from the inside of the outer box 12 is provided with the hydrophobic material 2100, so that even when the air flow rate at the air outlet 220 is small, the amount of water vapor entering the energy storage device 1 through the air outlet 220 is small, thereby reducing the water vapor content in the energy storage device 1, and further improving the reliability of the energy storage device 1.

[0129] Figure 8 A schematic diagram of the energy storage device 1 provided in another embodiment of the present application is shown.

[0130] In some possible embodiments, the energy storage device 1 further includes a collecting portion 240 and a drainage portion 250. The collecting portion 240 is configured to collect water vapor on the surface of the air inlet 210 facing the inside of the outer box 12 and / or the surface of the air outlet 220 facing the inside of the outer box 12. The drainage portion 250 is connected to the collecting portion 240 and is configured to drain the water vapor collected by the collecting portion 240 out of the energy storage device 1.

[0131] The collecting portion 240 can include a surface with a sharp end, which is arranged opposite to the drainage pipeline to collect the condensed water vapor. The collecting portion 240 can also be a funnel-shaped structure, and the bottom end of the funnel-shaped structure is configured to collect the condensed water through the drainage pipeline.

[0132] The drainage portion 250 can be a floor drain, and the collecting portion 240 can be connected to the drainage portion 250 through the drainage pipeline, so that the condensed water collected by the collecting portion 240 is transported to the drainage portion 250 through the drainage pipeline, and then drained through the drainage portion 250.

[0133] The support structure 260 can support the energy storage device 1, so that the overall height of the energy storage device 1 is higher than the ground surface.

[0134] Since the water vapor content on the ground surface is generally high, the overall height of the energy storage device 1 higher than the ground surface can reduce the amount of water vapor carried by the air flow at the air inlet 210.

[0135] The energy storage device 1 is supported by the support structure 260, and the bottom wall 122 of the energy storage device 1 is also exposed to the air, so that the bottom wall 122 of the energy storage device 1 can also be provided with the air inlet part 210, thereby being capable of improving the air flow and improving the cooling efficiency.

[0136] The support structure 260 supporting the energy storage device 1 is also conducive to the drainage of the condensed water by the drainage part 250.

[0137] Figure 9 A schematic diagram of the energy storage device 1 provided by another embodiment of the present application is shown.

[0138] In some possible embodiments, the energy storage device 1 further comprises a fan 270, which is arranged at one side of the air inlet part 210 close to the inside of the outer box 12 and / or one side of the air outlet part 220 close to the inside of the outer box 12.

[0139] When the ground temperature is relatively high or the temperature difference between the battery device 10 in the energy storage device 1 and the ground is insufficient, the circulation speed of the air can be improved by adding the fan 270 in the energy storage device 1.

[0140] The fan 270 can be arranged at the air inlet part 210 or the air outlet part 220, or both the air inlet part 210 and the air outlet part 220, and the embodiments of the present application do not make any limitation in this regard.

[0141] In the technical scheme provided by the embodiments of the present application, by arranging the fan 270 at one side of the air inlet part 210 close to the inside of the outer box 12 and / or one side of the air outlet part 220 close to the inside of the outer box 12, sufficient circulation power can be provided for the air circulation in the energy storage device 1 even when the temperature difference between the air outlet part 220 and the air inlet part 210 is small, so that the cooling efficiency of the battery device 10 can be maintained, thereby improving the stability of the energy storage device 1.

[0142] Figure 10 A schematic diagram of the energy storage device 1 provided by another embodiment of the present application is shown.

[0143] In some possible embodiments, the energy storage device 1 further comprises a plurality of inner side walls 1001 and a bracket 1002, which are accommodated in the outer box 12, and the plurality of inner side walls 1001 are arranged at intervals. The bracket 1002 is arranged on the opposite surfaces of the plurality of inner side walls 1001, and the bracket 1002 is used to support the battery device 10. The battery device 10 is in direct contact with the bracket 1002 or is connected through a heat-conducting medium.

[0144] The heat-conducting medium can be made of heat-conducting materials, which can include metal materials, non-metal materials, and composite materials, etc. The metal materials are, for example, copper, iron, etc. The non-metal materials are, for example, graphite, diamond, etc. The composite materials are, for example, materials made of carbon nanotubes, boron nitride nanosheets, etc. The above examples are only illustrative, and the embodiments of the present application are not limited thereto.

[0145] Optionally, the inner side wall 1001 and / or the bracket 1002 can be made of heat-conducting materials, so as to better transmit the heat generated by the battery device 10 to the outside through the structural members in the energy storage device 1.

[0146] In the technical solutions provided by the embodiments of the present application, the battery device 10 in the energy storage device 1 is in direct contact with the bracket 1002 or connected through a heat-conducting medium, and the heat generated by the battery device 10 can be transmitted to the outside through the structural members of the energy storage device 1, so as to improve the cooling efficiency of the battery device 10 and further improve the reliability of the energy storage device 1.

[0147] In some possible embodiments, at least part of the battery device 10 is arranged along the direction of gravity.

[0148] The battery device 10 is arranged along the direction of gravity, and the heat generated by the battery device 10 is more easily lifted to form a higher temperature difference, which can generate a circulating power to speed up the air circulation speed between the air inlet portion 210 and the air outlet portion 220, so as to improve the cooling efficiency of the energy storage device 1.

[0149] In some possible embodiments, the battery device 10 includes a box body 11 and a plurality of battery monomers 20, and the plurality of battery monomers 20 are contained in the box body 11; wherein a heat-conducting medium is arranged between the plurality of battery monomers 20 and the bottom surface of the box body 11, and the battery monomers 20 are connected to the bottom surface of the box body 11 through the heat-conducting medium.

[0150] In the technical solutions provided by the embodiments of the present application, the heat-conducting medium is arranged between the battery monomers 20 and the bottom surface of the box body 11 of the battery device 10, the heat generated by the battery monomers 20 can be more efficiently transmitted to the surface of the battery device 10, and the heat is exchanged with the structural members of the energy storage device 1 or the air in the energy storage device 1 through the surface of the battery device 10, so as to more quickly reduce the temperature of the battery monomers 20. Therefore, the reliability of the energy storage device 1 can be improved.

[0151] In some possible embodiments, an opening is arranged at the top of the box body 11 of the battery device 10.

[0152] In the technical solutions provided by the embodiments of the present application, the opening is arranged at the top of the box body 11 of the battery device 10, and the air can circulate through the top opening of the battery device 10, so as to more quickly take away the heat generated by the battery monomers 20 in the battery device 10.

[0153] Further, in the case that the surface of the air inlet portion 210 toward the inside of the outer box 12 is provided with a hydrophobic material 2100 or the surface of the air outlet portion 220 toward the inside of the outer box 12 is provided with a hydrophilic material 2200, the water vapor content in the energy storage device 1 is reduced, even if the top of the battery device 10 is provided with an opening, the influence of water vapor on the battery device 10 is small, and the influence of the unsealed battery device 10 is reduced. Moreover, canceling the top cover of the battery device 10 is conducive to reducing the weight of the battery device 10 and improving the energy density of the battery device 10.

[0154] The embodiments of the present application also provide an energy storage system, which comprises the energy storage device 1 described in any of the above embodiments.

[0155] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. An energy storage device, characterized by, The energy storage device comprises: an outer box (12), which comprises a top wall (121), a bottom wall (122), and a peripheral side wall (123) connecting the top wall (121) and the bottom wall (122); a battery device (10) accommodated in the outer box (12); wherein the bottom wall (122) of the outer box (12) and / or the lower end of the peripheral side wall (123) in the direction of gravity is provided with an air inlet portion (210), and the top wall (121) of the outer box (12) and / or the upper end of the peripheral side wall (123) in the direction of gravity is provided with an air outlet portion (220), the air inlet portion (210) is used for natural wind to enter the energy storage device, and the air inlet portion (210) comprises a first partition plate (2101) comprising a plurality of through holes (2000) penetrating the first partition plate (2101).

2. The energy storage device of claim 1, wherein, The surface of the first partition plate (2101) away from the inside of the outer box (12) is provided with a hydrophobic material (2100).

3. The energy storage device of claim 2, wherein, The surface of the first partition plate (2101) facing the inside of the outer box (12) is provided with a hydrophilic material (2200).

4. The energy storage device of claim 1, wherein, The air outlet portion (220) comprises: a second partition plate (2201) comprising a plurality of through holes (2000) penetrating the second partition plate (2201).

5. The energy storage device of claim 4, wherein, The surface of the second partition plate (2201) facing the inside of the outer box (12) is provided with a hydrophilic material (2200).

6. The energy storage device of claim 5, wherein, The surface of the second partition plate (2201) away from the inside of the outer box (12) is provided with a hydrophobic material (2100).

7. The energy storage device of claim 1, wherein, The energy storage device further comprises: a collection portion (240) for collecting water vapor on the surface of the air inlet portion (210) facing the inside of the outer box (12) and / or the surface of the air outlet portion (220) facing the inside of the outer box (12); a drainage portion (250) connected to the collection portion (240) for draining the water vapor collected by the collection portion (240) out of the energy storage device.

8. The energy storage device of claim 1, wherein, The energy storage device further comprises: a fan (270) arranged on one side of the air inlet portion (210) close to the inside of the outer box (12) and / or one side of the air outlet portion (220) close to the inside of the outer box (12).

9. The energy storage device of claim 1, wherein, The energy storage device further comprises: a plurality of inner side walls (1001) accommodated in the outer box (12), which are arranged at intervals; a bracket (1002) arranged on the opposite surfaces of the plurality of inner side walls (1001), which is used to support the battery device (10); wherein the battery device (10) is in direct contact with the bracket (1002) or connected through a heat-conducting medium.

10. The energy storage device of claim 1, wherein, At least part of the battery device (10) is arranged in the direction of gravity.

11. The energy storage device of claim 1, wherein, The battery device (10) comprises: a box (11); a plurality of battery monomers (20) accommodated in the box (11); Among them, the plurality of battery monomers (20) and the bottom surface of the box (11) are provided with a heat conducting medium, and the battery monomers (20) are connected with the bottom surface of the box (11) through the heat conducting medium.

12. The energy storage device of any one of claims 1-11, wherein, The top of the box (11) of the battery device (10) is provided with an opening.

13. An energy storage system characterized by, Comprising: The energy storage device of any one of claims 1 to 12.

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