Energy storage device, energy storage system and charging network

Abstract

The utility model discloses an energy storage device, an energy storage system and a charging network, the energy storage device comprises at least one first device, the first device comprises a box body with a sealed space, the box body comprises a first wall body, a first part and a connecting assembly, and the first wall body is provided with a mounting hole communicating the sealed space with the outside of the box body; the first part is connected to the first wall body through the connecting assembly and seals the mounting hole, the pore diameter of the first part is larger than 0 and smaller than or equal to 0.28 nm, the first part comprises an elastic part, and the elastic modulus of the elastic part is larger than or equal to 0.5 MPa and smaller than or equal to 50 MPa. The energy storage device, the energy storage system and the charging network provided by the utility model are high in electrical reliability.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to energy storage devices, energy storage systems and charging networks. Background Technology

[0002] Energy storage devices are devices used to store electrical energy. They contain battery devices and are characterized by convenient installation and transportation, high integration, small footprint, and good scalability. They are an important part of the development of distributed energy, smart grids, and the energy internet in the field of energy storage.

[0003] Improving the electrical reliability of energy storage devices is one of the topics that the industry needs to study. Utility Model Content

[0004] To address the aforementioned technical problems, this application provides an energy storage device, energy storage system, and charging network with high electrical reliability.

[0005] This application is achieved through the following technical solution.

[0006] The first aspect of this application provides an energy storage device, including at least one first device. The first device includes a housing with a sealed space. The housing includes a first wall, a first component, and a connecting assembly. The first wall has a mounting hole that communicates with the sealed space and the outside of the housing. The first component is connected to the first wall and seals the mounting hole through the connecting assembly. The pore diameter of the first component is greater than 0 and less than or equal to 0.28 nm. The first component includes an elastic portion with an elastic modulus greater than or equal to 0.5 MPa and less than or equal to 50 MPa.

[0007] In the energy storage device provided in this application embodiment, the first component includes an elastic part, and the elastic modulus of the elastic part is greater than or equal to 0.5 MPa and less than or equal to 50 MPa. Therefore, when the air pressure in the enclosed space of the housing changes, the first component can balance the internal and external air pressure by undergoing appropriate deformation towards the outside or inside of the housing, reducing the impact on the structural reliability of the housing caused by excessive internal and external pressure difference. Furthermore, since the pore diameter of the first component is greater than 0 and less than or equal to 0.28 nm, the pore diameter within this range is smaller than the diameter of water vapor and air, preventing water vapor and air from passing through. That is, the first component isolates the interaction between internal and external gases and water vapor, reducing the probability of internal condensation, reducing the risk of insulation failure, and thus improving the electrical reliability of the energy storage device. In addition, by installing the first component on the first wall of the housing, compared to the case where the housing is connected to an independently installed pressure regulating device via pipelines, the first component for pressure regulation in this application embodiment has a simpler structure, occupies less space, and is conducive to the miniaturization of the first device, thereby facilitating the miniaturization of the energy storage device.

[0008] In some embodiments, the first component includes an elastic membrane that covers the mounting hole and whose outer peripheral edge is fixed to the first wall.

[0009] Thus, using an elastic membrane to seal the mounting hole not only balances the air pressure through the elastic deformation of the membrane, but also, due to its simple structure and small footprint, facilitates the miniaturization of the first device. Furthermore, by fixing the outer periphery of the elastic membrane to the first wall, the mounting hole is sealed in the middle area of ​​the elastic membrane, making it difficult for gas to enter or exit the enclosed space from the outer periphery of the elastic membrane, thus ensuring a tight seal between the elastic membrane and the first wall.

[0010] In some embodiments, the mounting hole is a circular hole; and / or, the elastic membrane is a circular membrane.

[0011] Circular holes can evenly distribute stress under load, reducing localized stress concentration caused by sharp corners or edges, thus making them more resistant to fatigue and deformation during long-term use. Furthermore, the processing technology for circular holes is mature (such as drilling and stamping), resulting in high production efficiency and low cost. The circular shape of the elastic membrane further enhances the uniformity of stress distribution during deformation, reducing the probability of localized tearing due to stress concentration.

[0012] In some embodiments, the elastic membrane is made of rubber.

[0013] Rubber not only meets the requirements for elasticity and pore size, but also has high wear resistance and high temperature adaptability, which allows the elastic membrane to maintain stable performance at high temperatures, thereby better performing its functions of regulating air pressure and blocking gas and water vapor.

[0014] In some embodiments, the elastic membrane is made of EPDM rubber.

[0015] Ethylene propylene diene monomer (EPDM) rubber is a high-performance synthetic rubber with high aging resistance, high chemical stability, and good elasticity. Using EPDM rubber in elastic membranes can better achieve the effects of regulating gas pressure and blocking gases and moisture.

[0016] In some embodiments, a heating element is also provided inside the housing.

[0017] Thus, with a heating element inside the enclosure, the temperature inside the enclosure is more prone to change, which in turn makes the air pressure inside the enclosure more prone to change. Therefore, this first device needs to be equipped with a first component that can regulate pressure and block air and water vapor. In other words, when a heating element is installed inside the enclosure of the first device, the first component can better play the role of regulating pressure and blocking air and water vapor, thereby improving the electrical reliability of the first device.

[0018] In some embodiments, the thickness of the elastic membrane is greater than or equal to 0.005 mm and less than or equal to 10 mm.

[0019] In this way, the thickness of the elastic membrane is appropriate, which allows the elastic membrane to deform appropriately to balance the internal and external pressure when the air pressure inside the box changes, without causing the overall volume of the box to be too large due to the elastic membrane being too thick.

[0020] In some embodiments, the connecting assembly includes a pressing member and at least one connecting member, the pressing member being connected to the side of the first wall facing the sealed space and / or the side away from the sealed space via the connecting member, and the first component being clamped between the pressing member and the first wall.

[0021] The connection component is configured in such a way that the first component can be stably connected to the first wall. Moreover, the connection component has a simple structure, occupies little space, and has low cost.

[0022] In some embodiments, the pressing member is a ring structure; and / or, at least three connecting members are provided, and they are evenly distributed around the mounting hole.

[0023] By setting the pressure-retaining component as a circular structure, the uniformity of stress distribution during elastic membrane deformation can be improved, reducing the probability of localized tearing due to stress concentration. Furthermore, by setting at least three connectors evenly distributed around the mounting hole, the uniformity and reliability of the pressure-retaining component can be improved, which is beneficial to improving the sealing performance at the connection between the elastic membrane and the mounting hole.

[0024] In some embodiments, the connector includes a connected rod and a first abutting portion. The rod passes through the pressing member and the first component in sequence and is threadedly connected to the first wall. The first abutting portion abuts against the surface of the pressing member facing away from the first component.

[0025] In this way, the connecting piece achieves its function of connecting the pressing piece to the first wall. The connecting piece has a simple structure, low cost, and convenient connection operation.

[0026] In some embodiments, the connection assembly includes: a connector detachably connected to a first wall, the connector having a through hole, a first component blocking the through hole, the through hole communicating with a mounting hole; and a seal disposed on the connector and sealing the gap between the connector and the first wall.

[0027] The first component is mounted on the connector, which is detachably connected to the first wall. This allows for convenient replacement of the faulty first component by disassembling and reassembling the connector to the first wall. Furthermore, the sealing element improves the sealing performance at the mounting hole, meeting the operational requirements of the first device.

[0028] In some embodiments, at least a portion of the outer peripheral surface of the connector is formed with an external thread, the wall of the mounting hole is formed with an internal thread, and the connector is threadedly connected to the mounting hole.

[0029] In the event of failure of the first component, it can be easily replaced by disassembling and assembling the connector. Furthermore, the connector is threaded into the mounting hole, improving the ease of disassembly and assembly of the connector from the first wall.

[0030] In some embodiments, the connector includes a connecting portion and a second abutting portion connected together, a through hole passing through the connecting portion and the second abutting portion, the connecting portion extending into the mounting hole and being detachably connected to the mounting hole, the size of the second abutting portion being larger than the size of the mounting hole along the radial direction of the through hole, an abutting surface facing the first wall being formed between the second abutting portion and the connecting portion, and a seal being sandwiched between the abutting surface and the first wall.

[0031] In this way, not only can the connector be easily disassembled and assembled with the first wall, but the sealing element also improves the sealing performance of the connection between the connector and the first wall, meeting the sealing requirements of the first device.

[0032] In some embodiments, at least one of the first devices is a battery device, and the sealed space of the battery device contains at least one battery cell.

[0033] During operation, the individual cells of the battery device generate heat, and the air pressure inside the battery box increases. The first component balances the pressure through elastic deformation. In addition, the first component prevents external moisture from entering the box, reducing the probability of condensation and the risk of insulation failure, thereby improving the electrical reliability of the battery device.

[0034] In some embodiments, at least one of the first devices is an electrical control box, the sealed space of which contains a plurality of electronic devices.

[0035] The electronic components in the electrical control box are the heat-generating components. During operation, these components generate heat, which increases the air pressure inside the control box. The pressure is balanced by the elastic deformation of the first component. Furthermore, the first component prevents external moisture from entering the box, reducing the likelihood of condensation and the risk of insulation failure, thereby improving the electrical reliability of the control box.

[0036] In some embodiments, at least one of the first devices is an electric heater, and the sealed space of the electric heater contains a heating element.

[0037] The heating element in the electric heater is the heating component. During operation, the heating component generates heat, which increases the air pressure inside the electric heater housing. The pressure is balanced by the elastic deformation of the first component. Furthermore, the first component prevents external moisture from entering the housing, reducing the probability of condensation and the risk of insulation failure, thereby improving the electrical reliability of the electric heater.

[0038] A second aspect of this application provides an energy storage system, including a power conversion device and an energy storage device provided in the first aspect, wherein the power conversion device is used to electrically connect a power generation device and an energy storage device.

[0039] Since the energy storage system includes the aforementioned energy storage device, and has all the beneficial effects of the energy storage device, the energy storage system has high electrical reliability.

[0040] A third aspect of this application provides a charging network, including a charging pile and an energy storage device provided in the first aspect or an energy storage system provided in the second aspect, wherein the energy storage device or energy storage system is used to provide electrical energy to the charging pile.

[0041] Since the charging network includes the aforementioned energy storage device or energy storage system, and has all the beneficial effects of the energy storage device or energy storage system, the charging network has high electrical reliability.

[0042] The beneficial effects of the embodiments disclosed herein include: providing an energy storage device, energy storage system, and charging network with high electrical reliability. Attached Figure Description

[0043] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0044] Figure 1 This is a three-dimensional structural schematic diagram of an energy storage device according to one or more embodiments;

[0045] Figure 2 This is an exploded perspective view of a battery device according to one or more embodiments;

[0046] Figure 3 A three-dimensional structural schematic diagram of a battery cell according to one or more embodiments;

[0047] Figure 4 This is a three-dimensional exploded view of a battery cell according to one or more embodiments;

[0048] Figure 5 This is a schematic diagram of the structure of an energy storage device according to one or more embodiments;

[0049] Figure 6 A cross-sectional view of a first device according to one or more embodiments;

[0050] Figure 7 This is a schematic diagram of a structure in which a first component is connected to a connection assembly of a first structure according to one or more embodiments;

[0051] Figure 8 for Figure 7 Exploded view of the middle structure;

[0052] Figure 9 A cross-sectional view showing the connection between a first component and a second-structure connection assembly according to one or more embodiments;

[0053] Figure 10 This is a schematic diagram of the structure of an energy storage system according to one of several embodiments;

[0054] Figure 11 This is a schematic diagram of the structure of a charging network according to one of several embodiments.

[0055] Explanation of reference numerals in the attached figures

[0056] 1000, Energy storage device; 100, Battery device; 10, Battery box; 101, Box cover; 102, Box body; 20, Battery cell; 201, Battery casing; 2011, End cap; 2012, Battery housing; 202, Electrode assembly; 2021, Electrode tab; 203, Adapter component; 204, Pressure relief mechanism; 205, Electrode terminal; 200, Energy storage box; 300, Electric heater; 400, Electrical control box; 210, Communication interface; 220, Power transmission interface; 1, First device; 11, Box body; 111, First wall; 1111, Mounting hole; 12, First component; 12a, Elastic membrane; 13, Connecting assembly; 131, Pressing member; 132, Connecting member; 1321, First abutting part; 1322, Rod body; 133, Connector; 1330, Through hole; 1331, Connecting part; 1332, Second abutting part; 13321, Abutting surface; 134, Sealing element; 14, Heating element; 2000, Energy storage system; 3000, Power conversion device; 4000, Power generation device; 5000, Charging pile; 6000, Charging network; 7000, Connector. Detailed Implementation

[0057] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0059] In the description of the embodiments of this application, technical terms such as "first," "second," and "third" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0060] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0061] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0062] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", 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 the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0063] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0064] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0065] The following is a detailed description of this application.

[0066] Energy storage devices are used to store electrical energy. They contain internal battery units and are characterized by convenient installation and transportation, high integration, small footprint, and good scalability. They are an important component of distributed energy, smart grids, and the energy internet in the energy storage field. With the rapid development of new energy technologies, energy storage devices have become one of the most important research directions in the new energy sector.

[0067] In related technologies, energy storage devices include, but are not limited to, battery devices for storing electrical energy, electric heaters for thermal management of battery devices, and electrical control boxes mainly used for the control, protection, and monitoring of power systems. These devices all have sealed enclosures equipped with waterproof and breathable valves. The function of these valves is primarily to balance the internal and external pressures of the device through ventilation, while preventing water, dust, or other contaminants from entering the device, thus protecting its normal operation. However, waterproof and breathable valves cannot effectively prevent water vapor (gaseous water) from entering. Water vapor entering the device will condense upon encountering walls with temperatures lower than the dew point temperature of water vapor. The condensate generated inside the device reduces the electrical clearances of internal electrical components, leading to insulation failure and causing problems such as poor electrical reliability in the energy storage device.

[0068] Based on this design concept, the inventors of this application have designed an energy storage device. The energy storage device includes at least one first device. The first device includes a box with a sealed space. The box includes a first wall, a first component, and a connecting assembly. The first wall has a mounting hole that communicates with the sealed space and the outside of the box. The first component is connected to the first wall and seals the mounting hole through the connecting assembly. The pore diameter of the first component is greater than 0 and less than or equal to 0.28 nm. The first component includes an elastic part with an elastic modulus greater than or equal to 0.5 MPa and less than or equal to 50 MPa.

[0069] In this energy storage device design, at least a portion of the first component is elastic. Therefore, when the air pressure within the enclosed space of the housing changes, the first component can balance the internal and external air pressures by deforming towards the outside or inside of the housing, reducing the impact on the structural reliability of the housing caused by excessive internal and external pressure differences. Furthermore, since the pore diameter of the first component is greater than 0 and less than or equal to 0.28 nm, the pore diameter within this range is smaller than the diameter of water vapor and air, preventing water vapor and air from passing through. That is, the first component isolates the interaction between internal and external gases and water vapor, reducing the probability of internal condensation and the risk of insulation failure, thereby improving the electrical reliability of the energy storage device. In addition, by installing the first component on the first wall of the housing, compared to the case where the housing is connected to a separately installed pressure regulating device via pipelines, the first component used for pressure regulation in this design has a simpler structure, occupies less space, and facilitates the miniaturization of the first device, thus contributing to the miniaturization of the energy storage device.

[0070] The energy storage device provided in this application can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. The energy storage device can store electrical energy as needed and output it at appropriate times. For example, the energy storage device can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. The energy storage system provided in this application can be any power system that requires the use of an energy storage device.

[0071] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0072] In some embodiments, the energy storage device may include an energy storage housing and one or more battery clusters housed within the energy storage housing. Each battery cluster may include multiple battery devices connected in series via a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the clusters are connected in parallel to increase the capacity of the energy storage device.

[0073] 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.

[0074] As an example, the thermal management module may include a heat exchanger that supplies coolant to each battery unit via piping to regulate the temperature of the individual battery cells.

[0075] 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.

[0076] As an example, the central control module can serve as the battery management unit for an energy storage device, used to monitor and manage the device. The central control module can monitor information such as the energy storage device's current, voltage, power, state of charge, or temperature. For instance, it can control the charging and discharging current and voltage of the energy storage device. As an example, the central control module includes modules such as an Insulation Monitoring Module (IMM), a Master Battery Management Unit (MBMU), an Ethernet (ETH) module, and a fiber optic conversion module.

[0077] As an example, the fire protection module includes a control panel, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in energy storage devices.

[0078] As an example, the power distribution unit can be used to distribute power to the power modules of the energy storage device.

[0079] In the embodiments of this application, "multiple" means two or more.

[0080] Figure 1 This is a three-dimensional structural schematic diagram of an energy storage device according to one or more embodiments;

[0081] Reference Figure 1 The energy storage device 1000 may include an energy storage housing 200 and at least one battery device 100 housed within the energy storage housing 200. The energy storage device 1000 may also include a communication interface 210 and a power transmission interface 220 disposed within the energy storage housing 200. In some embodiments, the energy storage housing 200 may be internally divided into a battery compartment and an electrical compartment. The battery device 100 is typically placed in the battery compartment, while the main control module, master control module, etc., are typically located in the electrical compartment. The communication interface 210 and the power transmission interface 220 can be electrically connected to the main control module, master control module, etc., within the electrical compartment.

[0082] Figure 2 This is a three-dimensional structural schematic diagram of a battery device 100 according to one or more embodiments.

[0083] In some embodiments of this application, such as Figure 2As shown, the battery device 100 includes a battery case 10 and at least one battery cell 20. The battery case 10 has a receiving space, in which at least one battery cell 20 is received.

[0084] In some embodiments of this application, the battery box 10 includes a box body 102 and a box cover 101, with the box cover 101 covering the box body 102, thereby forming the receiving space between the box body 102 and the box cover 101.

[0085] The main body 102 can be a hollow structure with one open end, and the cover 101 can be a plate-like structure. The cover 101 closes onto the open side of the main body 102 so that the cover 101 and the main body 102 together define the receiving space. Alternatively, both the cover 101 and the main body 102 can be hollow structures with one open side, with the open side of the cover 101 closing onto the open side of the main body 102. Of course, the battery box 10 formed by the cover 101 and the main body 102 can be of various shapes, such as a cylinder, a cuboid, etc.

[0086] In the battery device 100, there can be multiple battery cells 20. These multiple battery cells 20 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is placed in the receiving space formed by the main body 102 and the cover 101. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed configuration to form a battery module, and then multiple battery modules connected in series, parallel, or in a mixed configuration to form a whole, which is then housed in the receiving space formed by the main body 102 and the cover 101. The battery device 100 may also include other structures; for example, the battery device 100 may also include a busbar component for realizing the electrical connection between the multiple battery cells 20.

[0087] The battery cell 20 can be a secondary battery. A secondary battery is a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0088] The battery cell 20 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0089] Figure 3 A three-dimensional structural schematic diagram of a battery cell 20 according to one or more embodiments; Figure 4 This is an exploded perspective view of a battery cell 20 according to one or more embodiments.

[0090] like Figure 3 and Figure 4As shown, the battery cell 20 includes an electrode assembly 202. The electrode assembly 202 includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator is disposed between the positive and negative electrodes to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0091] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0092] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0093] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0094] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium manganese iron phosphate, and lithium manganese iron phosphate and carbon composites.

[0095] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal may also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0096] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0097] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. Composite current collectors can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.). In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0098] In some embodiments, the electrode assembly 202 further includes an isolator disposed between the positive and negative electrodes.

[0099] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0100] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic.

[0101] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0102] In some embodiments, the battery cell 20 further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte, which can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0103] In some embodiments, the electrode assembly 202 is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0104] In some embodiments, the electrode assembly 202 has a stacked structure.

[0105] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0106] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0107] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0108] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0109] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0110] In some embodiments, the electrode assembly 202 may be cylindrical, flat, or polygonal, etc.

[0111] In some embodiments, the electrode assembly 202 is provided with tabs 2021, which can conduct current from the electrode assembly 202. The tabs 2021 include a positive tab and a negative tab.

[0112] In some embodiments, the battery cell 20 may include a battery casing 201. The battery casing 201 may be a steel casing, an aluminum casing, a plastic casing (such as polypropylene), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the battery casing 201 may be a sealed structure or a non-sealed structure. As an example, when the battery casing 201 is a non-sealed structure, the battery casing 201 serves to protect the electrode assembly, and a sealing bag is included between the battery casing 201 and the electrode assembly. The sealing bag is used to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the battery casing 201 is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0113] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0114] In some embodiments, the battery housing 201 includes an end cap 2011 and a battery casing 2012. The battery casing 2012 has an opening, and the end cap 2011 closes the opening to form a sealed space for accommodating the electrode assembly 202 and substances such as electrolyte. The battery casing 2012 may have one or more openings. The end cap 2011 may also be provided in one or more ways.

[0115] In some embodiments, at least one electrode terminal 205 is provided on the battery casing 201, and the electrode terminal 205 is electrically connected to the tab 2021. The electrode terminal 205 can be directly connected to the tab 2021, or it can be indirectly connected to the tab 2021 through an adapter 203. The electrode terminal 205 can be provided on the end cap 2011 or on the battery casing 2012.

[0116] In some embodiments, a pressure relief mechanism 204 is provided on the battery casing 201. The pressure relief mechanism 204 is used to release the internal pressure of the battery cell.

[0117] Below, refer to Figures 5 to 11 Some embodiments of this application will be described in detail.

[0118] Figure 5 This is a schematic diagram of the structure of an energy storage device according to one or more embodiments; Figure 6 A cross-sectional view of a first device according to one or more embodiments; Figure 7 This is a schematic diagram of a structure in which a first component is connected to a connection assembly of a first structure according to one or more embodiments; Figure 8 for Figure 7 Exploded view of the middle structure; Figure 9 A cross-sectional view showing the connection between a first component and a second-structure connection assembly according to one or more embodiments; Figure 10 This is a schematic diagram of the structure of an energy storage system according to one of several embodiments; Figure 11 This is a schematic diagram of the structure of a charging network according to one of several embodiments.

[0119] The first aspect of this application provides an energy storage device 1000, such as... Figure 5 and Figure 6 As shown, the energy storage device 1000 includes at least one first device 1. The first device 1 includes a housing 11 with a sealed space. The housing 11 includes a first wall 111, a first component 12, and a connecting assembly 13. The first wall 111 has a mounting hole that communicates with the sealed space and the outside of the housing 11. The first component 12 is connected to the first wall 111 through the connecting assembly 13 and seals the mounting hole 1111. The pore diameter of the first component 12 is greater than 0 and less than or equal to 0.28 nm. The first component 12 includes an elastic part with an elastic modulus greater than or equal to 0.5 MPa and less than or equal to 50 MPa.

[0120] Specifically, the enclosure 11 includes multiple interconnected enclosure walls that enclose a sealed space. At least one of the enclosure walls includes a first wall 111 and a first component 12.

[0121] For example, the energy storage device 1000 includes an energy storage box 200 and a battery device 100, an electric heater 300 and an electrical control box 400 housed within the energy storage box 200.

[0122] It should be noted that the first device 1 can be at least one of the battery device 100, electric heater 300 and electrical control box 400 of the energy storage device 1000.

[0123] For example, the entire first component 12 is elastic.

[0124] For example, the pore diameter of the first component 12 can be, but is not limited to, 0.1nm, 0.11nm, 0.12nm, 0.13nm, 0.14nm, 0.15nm, 0.16nm, 0.17nm, 0.18nm, 0.19nm, 0.2nm, 0.21nm, 0.22nm, 0.23nm, 0.24nm, 0.25nm, 0.26nm, 0.27nm, and 0.28nm.

[0125] For example, the elastic modulus of the elastic part can be, but is not limited to, 0.5MPa, 1MPa, 2MPa, 3MPa, 4MPa, 5MPa, 6MPa, 7MPa, 8MPa, 9MPa, 10MPa, 15MPa, 20MPa, 21MPa, 22MPa, 23MPa, 24MPa, 25MPa, 30MPa, 45MPa, and 50MPa.

[0126] In the energy storage device 1000 provided in this application embodiment, the first component 12 includes an elastic component, and the elastic modulus of the elastic component is greater than or equal to 0.5 MPa and less than or equal to 50 MPa. Therefore, when the air pressure in the enclosed space of the housing 11 changes, the first component 12 can balance the internal and external air pressure by undergoing appropriate deformation towards the outside or inside of the housing 11, reducing the impact on the structural reliability of the housing 11 caused by excessive internal and external pressure difference. Furthermore, since the pore diameter of the first component 12 is greater than 0 and less than or equal to 0.28 nm, the pore diameter within this range is smaller than the diameter of water vapor and air, preventing water vapor and air from passing through. That is, the first component 12 isolates the interaction of internal and external gases and water vapor, reducing the probability of internal condensation, reducing the risk of insulation failure, and thus improving the electrical reliability of the energy storage device 1000. Furthermore, in this embodiment, by installing the first component 12 onto the first wall 111 of the housing 11, compared to the case where the housing 11 is connected to a separately installed pressure regulating device via pipelines, the first component 12 for pressure regulation in this embodiment has a simpler structure, occupies less space, and facilitates the miniaturization of the first device 1, thereby facilitating the miniaturization of the energy storage device 1000. Moreover, the provision of the connecting component 13 enables the installation of the first component 12 onto the first wall 111, which helps improve the stability and sealing of the installation of the first component 12.

[0127] In some embodiments of this application, such as Figure 6 As shown, the first component 12 includes an elastic membrane 12a, which covers the mounting hole 1111 and its outer peripheral edge is fixed to the first wall 111.

[0128] It is understood that the elastic membrane 12a is an elastic membrane material, and the pore diameter of the elastic membrane 12a is in the range of 0~0.28nm. When the air pressure inside the sealed space is greater than the external air pressure, the elastic membrane 12a bulges outward to reduce the internal air pressure and maintain balance with the external air pressure; when the air pressure inside the sealed space is less than the external air pressure, the elastic membrane 12a concaves inward to increase the internal air pressure and maintain balance with the external air pressure.

[0129] Thus, by using the elastic membrane 12a to cover the mounting hole 1111, the air pressure can be balanced through the elastic deformation of the elastic membrane 12a. Moreover, the elastic membrane 12a has a simple structure and occupies little space, which is more conducive to the miniaturization of the first device 1. Furthermore, by fixing the outer peripheral edge of the elastic membrane 12a to the first wall 111, the middle area of ​​the elastic membrane 12a is covered by the mounting hole 1111, making it difficult for gas to enter or leave the enclosed space from the outer peripheral edge of the elastic membrane 12a, which is beneficial to the sealing connection between the elastic membrane 12a and the first wall 111.

[0130] Of course, it is understood that the first component 12 is not limited to using an elastic membrane 12a, but can also use other structures. For example, the first component 12 includes a sleeve, a sealing plate disposed movably in the sleeve, and an elastic element (e.g., a spring) connected to the sealing plate. When the air pressure in the sealed space is greater than the external air pressure, the pressure difference drives the sealing plate to slide in the sleeve and causes the elastic element to be stretched or compressed, thereby changing the size of the area of ​​the sleeve connected to the sealed space, thereby adjusting the air pressure in the sealed space to balance the internal and external air pressure.

[0131] In some embodiments of this application, such as Figure 6 and Figure 7 As shown, mounting hole 1111 is a circular hole; and / or, elastic membrane 12a is a circular membrane.

[0132] Circular holes can evenly distribute stress under load, reducing localized stress concentration caused by sharp corners or edges, thus making them more resistant to fatigue and deformation during long-term use. Furthermore, the processing technology for circular holes is mature (such as drilling and stamping), resulting in high production efficiency and low cost. The circular shape of the elastic membrane 12a further enhances the uniformity of stress distribution during deformation, reducing the probability of localized tearing due to stress concentration.

[0133] Of course, it is understood that the shapes of the mounting hole 1111 and the elastic membrane 12a are not limited to circles, but can also be other shapes. For example, the mounting hole 1111 can be, but is not limited to, regular or irregular shapes such as polygonal holes and elliptical holes. Polygonal holes can be, but are not limited to, triangular holes, quadrilateral holes, pentagonal holes, hexagonal holes, etc. The elastic membrane 12a can be, but is not limited to, regular or irregular shapes such as polygonal membranes and elliptical membranes. Polygonal membranes can be, but are not limited to, triangular membranes, quadrilateral membranes, pentagonal membranes, hexagonal membranes, etc.

[0134] In some embodiments of this application, the material of the elastic membrane 12a includes rubber, and the rubber includes EPDM rubber.

[0135] It is understandable that the material of the elastic membrane 12a can be EPDM rubber, or other rubber materials that meet the pore size requirements.

[0136] Rubber not only meets the requirements for elasticity and pore size, but also possesses high wear resistance and temperature adaptability, allowing the elastic membrane 12a to maintain stable performance even at high temperatures, thus better fulfilling its functions of regulating gas pressure and blocking gases and moisture. Furthermore, ethylene propylene diene monomer (EPDM) rubber is a high-performance synthetic rubber with high aging resistance, high chemical stability, and good elasticity. Using EPDM rubber in the elastic membrane 12a allows for even better performance in regulating gas pressure and blocking gases and moisture.

[0137] Of course, it is understandable that the material of the elastic membrane 12a is not limited to rubber, but can also be other materials, such as thermoplastic polyurethane (TPU).

[0138] In some embodiments of this application, the housing 11 is further provided with a heating element 14, which is configured to generate heat.

[0139] It is understandable that the heating element 14 refers to a component that generates heat during operation. For example, the battery cell 20 of the battery device 100 generates heat during charging and discharging. Another example is the electronic components of the electrical control box 400, which generate heat during operation. Yet another example is the heating element of the electric heater 300, which generates heat during operation. Therefore, when the first device 1 is the battery device 100, the battery cell 20 is the heating element 14; when the first device 1 is the electrical control box 400, the electronic components are the heating element 14; and when the first device 1 is the electric heater 300, the heating element is the heating element 14.

[0140] Thus, with the heating element 14 inside the housing 11, the temperature inside the housing 11 is more prone to change, which in turn makes the air pressure inside the housing 11 more prone to change. Therefore, the first device 1 needs to be equipped with a first component 12 that can regulate pressure and block air and water vapor. In other words, when the heating element 14 is provided inside the housing 11 of the first device 1, the first component 12 can better play the role of regulating pressure and blocking air and water vapor, thereby improving the electrical reliability of the first device 1.

[0141] In some embodiments of this application, the thickness of the elastic membrane 12a is greater than or equal to 0.005 mm and less than or equal to 10 mm.

[0142] For example, the thickness of the elastic membrane 12a can be, but is not limited to, 0.005mm, 0.006mm, 0.007mm, 0.008mm, 0.009mm, 0.01mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, and 10mm.

[0143] In some embodiments of this application, the thickness of the elastic membrane 12a is greater than or equal to 0.025 mm and less than or equal to 10 mm.

[0144] For example, the thickness of the elastic membrane 12a can be, but is not limited to, 0.025mm, 0.035mm, 0.045mm, 0.055mm, 0.065mm, 0.075mm, 0.085mm, 0.095mm, 0.11mm, 0.21mm, 0.31mm, 0.41mm, 0.51mm, 0.61mm, 0.62mm, 0.71mm, 0.81mm, 0.91mm, 1.1mm, 2.5mm, 3.5mm, 4.5mm, 5.5mm, 6.5mm, 7.5mm, 8.5mm, and 9.5mm.

[0145] Thus, the thickness of the elastic membrane 12a is appropriate, which allows the elastic membrane 12a to deform appropriately to balance the internal and external pressure when the air pressure inside the box 11 changes, without causing the overall volume of the box 11 to be too large due to the elastic membrane 12a being too thick.

[0146] In some embodiments of this application, such as Figure 7 and Figure 8As shown, the connecting assembly 13 includes a pressing member 131 and at least one connecting member 132. The pressing member 131 is connected to the side of the first wall 111 facing the sealed space and / or the side away from the sealed space via the connecting member 132. The first component 12 is clamped between the pressing member 131 and the first wall 111.

[0147] The connection component 13 is configured in such a way that the first component 12 can be stably connected to the first wall 111. Moreover, the connection component 13 has a simple structure, occupies little space, and has low cost.

[0148] In some embodiments of this application, such as Figure 7 and Figure 8 As shown, the pressing member 131 has a circular ring structure; and / or, the connecting member 132 has at least three parts, which are evenly distributed around the mounting hole 1111.

[0149] For example, the mounting hole 1111 is a circular hole, the elastic membrane 12a is a circular membrane, and the pressing member 131 is a ring structure, and the three share a common central axis. In this way, the stress can be evenly distributed when the three are subjected to force, reducing the probability of local damage due to stress concentration.

[0150] For example, connector 132 may be provided in three, four, five, six or other numbers.

[0151] By setting the pressure member 131 as a circular structure, the uniformity of stress distribution when the elastic membrane 12a deforms can be improved, reducing the probability of local tearing due to stress concentration. Furthermore, by setting at least three connectors 132 and distributing them evenly around the mounting hole 1111, the uniformity and reliability of fixing the pressure member 131 can be improved, which is beneficial to improving the sealing performance at the connection between the elastic membrane 12a and the mounting hole 1111.

[0152] Of course, it is understood that the number of connectors 132 is not limited to at least three; in some other embodiments, one or two connectors 132 may also be provided.

[0153] In some embodiments of this application, such as Figure 8 As shown, the connector 132 includes a connected rod 1322 and a first abutting part 1321. The rod 1322 passes through the pressing member 131 and the first component 12 in sequence and is threadedly connected to the first wall 111. The first abutting part 1321 abuts against the surface of the pressing member 131 facing away from the first component 12.

[0154] Specifically, the first abutting part 1321 is connected to one end of the rod body 1322, the outer peripheral surface of the rod body 1322 is formed with an external thread, the first wall body 111 is formed with a threaded connection hole spaced apart from the mounting hole 1111, and the part of the rod body 1322 with the external thread is threadedly connected to the threaded connection hole of the first wall body 111.

[0155] For example, the rod 1322 and the first abutment 1321 are integrally formed.

[0156] In this way, the connector 132 connects the pressing member 131 to the first wall 111. The connector 132 has a simple structure, low cost, and convenient connection operation.

[0157] In some embodiments of this application, such as Figure 8 As shown, the pressing member 131 has a ring structure, and the first component 12 is an elastic membrane 12a.

[0158] In this way, the outer peripheral edge of the elastic membrane 12a is pressed against the first wall 111 by the pressing member 131. While achieving the sealing of the mounting hole 1111, the elastic membrane 12a itself is elastic, and the part of the elastic membrane 12a in contact with the first wall 111 can be tightly pressed together. Therefore, sealing rings and other components used to improve sealing can be omitted, thereby reducing the number of components and saving costs.

[0159] In some embodiments of this application, such as Figure 9 As shown, the connecting assembly 13 includes a connector 133 and a seal 134. The connector 133 is detachably connected to the first wall 111. The connector 133 has a through hole 1330. The first component 12 blocks the through hole 1330. The through hole 1330 communicates with the mounting hole 1111. The seal 134 is provided on the connector 133 and seals the gap between the connector 133 and the first wall 111.

[0160] The first component 12 is mounted on the connector 133, which is detachably connected to the first wall 111. This allows for easy replacement of the faulty first component 12 by detaching and reassembling the connector 133 from the first wall 111. Furthermore, the seal 134 improves the sealing performance at the mounting hole 1111, meeting the operational requirements of the first device 1.

[0161] In some embodiments of this application, such as Figure 9 As shown, at least a portion of the outer peripheral surface of the connector 133 is formed with an external thread, and the wall of the mounting hole 1111 is formed with an internal thread. The connector 133 and the mounting hole 1111 are connected by the threaded connection of the external thread and the internal thread.

[0162] In the event of failure of the first component 12, it can be easily replaced by disassembling and assembling the connector 133. Furthermore, the connector 133 is connected to the mounting hole 1111 by a thread, which improves the ease of disassembling and assembling the connector 133 from the first wall 111.

[0163] In some embodiments of this application, such as Figure 9 As shown, the connector 133 includes a connecting portion 1331 and a second abutting portion 1332 connected together. The through hole 1330 passes through the connecting portion 1331 and the second abutting portion 1332. The connecting portion 1331 extends into the mounting hole 1111 and is detachably connected to the mounting hole 1111. Along the radial direction of the through hole 1330, the size of the second abutting portion 1332 is larger than the size of the mounting hole 1111. The connection between the second abutting portion 1332 and the connecting portion 1331 forms an abutting surface 13321 facing the first wall 111. A sealing element 134 is sandwiched between the abutting surface 13321 and the first wall 111.

[0164] For example, the outer peripheral surface of the connecting part 1331 is formed with an external thread, and the connecting part 1331 is threadedly connected to the internal thread of the mounting hole 1111 through its external thread.

[0165] For example, the abutment surface 13321 forms a receiving groove, and at least a portion of the seal 134 is disposed within the receiving groove.

[0166] For example, the first component 12 is connected to one end of the second abutment portion 1332 facing away from the connecting portion 1331, and the first component 12 and the second abutment portion 1332 are sealed and bonded together.

[0167] For example, seal 134 may employ, but is not limited to, a sealing ring.

[0168] In this way, not only can the connector 133 be easily disassembled and assembled with the first wall 111, but the setting of the seal 134 also improves the sealing performance of the connection between the connector 133 and the first wall 111, thus meeting the sealing requirements of the first device 1.

[0169] In some embodiments of this application, such as Figure 2 and Figure 5 As shown, at least one of the first devices 1 is a battery device 100, and the sealed space of the battery device 100 contains at least one battery cell 20.

[0170] It is understood that the battery box 10 of the battery device 100 is the box 11, the battery cell 20 in the battery device 100 is the heating element 14, and the energy storage box 200 of the energy storage device 1000 contains multiple battery devices 100. The battery cell 20 of the battery device 100 will generate heat during operation. When the air pressure inside the box 11 (battery box 10) of the battery device 100 increases, the first component 12 balances the pressure through elastic deformation. Moreover, the first component 12 prevents external moisture from entering the box 11, reducing the probability of condensation inside, reducing the risk of insulation failure, and thus improving the electrical reliability inside the battery device 100.

[0171] In some embodiments of this application, such as Figure 5 As shown, at least one of the first devices 1 is an electrical control box 400, and the sealed space of the electrical control box 400 contains a plurality of electronic devices.

[0172] For example, the sealed space of the electrical control box 400 contains electronic devices such as circuit breakers, contactors, fuses, relays, transformers, control units, and switching power supplies. These electronic devices generate heat during operation, and these electronic devices are the heat-generating components 14.

[0173] It is understandable that the electronic components in the electrical control box 400 are the heating elements 14. The electronic components generate heat during operation, which increases the air pressure inside the box 11 of the electrical control box 400. The pressure is balanced by the elastic deformation of the first component 12. Moreover, the first component 12 prevents external moisture from entering the box 11, reducing the probability of condensation inside and the risk of insulation failure, thereby improving the electrical reliability of the electrical control box 400.

[0174] In some embodiments of this application, such as Figure 5 As shown, at least one of the first devices 1 is an electric heater 300, and the sealed space of the electric heater 300 contains a heating element.

[0175] Heating elements are components that convert electrical energy into heat energy according to Joule's law, including resistance wires, PTC (Positive Temperature Coefficient) thermistors, etc.

[0176] It should be noted that the electric heater 300 is a thermal management module of the energy storage device. The heating element of the electric heater 300 generates heat when energized, which is used to heat the heat exchange pipelines nearby, thereby managing the temperature inside the energy storage device.

[0177] It is understandable that the heating element in the electric heater 300 is the heating element 14. The heating element 14 will generate heat during operation, and the air pressure inside the housing 11 of the electric heater 300 will increase. Thus, the pressure is balanced by the elastic deformation of the first component 12. Moreover, the first component 12 prevents external moisture from entering the housing 11, reducing the probability of condensation inside, reducing the risk of insulation failure, and thus improving the electrical reliability of the electric heater 300.

[0178] A second aspect of this application provides an energy storage system 2000, such as Figure 10 As shown, the energy storage system 2000 includes a power conversion device 3000 and an energy storage device 1000 provided in the first aspect. The power conversion device 3000 is used to electrically connect the power generation device 4000 and the energy storage device 1000.

[0179] The power generation device 4000 is used to generate electrical energy, which can be stored in the energy storage device 1000 through the power conversion device 3000. As an example, the power generation device 4000 can specifically be a solar panel, hydroelectric power generation equipment, thermal power generation equipment, wind power generation equipment, etc. This application does not limit the specific type of the power generation device 4000.

[0180] Since the energy storage system 2000 includes the aforementioned energy storage device 1000, and has all the beneficial effects of the energy storage device 1000, the energy storage system 2000 has high electrical reliability.

[0181] A third aspect of this application provides a charging network, such as Figure 11 As shown, the charging network 6000 includes a charging pile 5000 and an energy storage device 1000 provided in the first aspect or an energy storage system 2000 provided in the second aspect, the energy storage device 1000 or the energy storage system 2000 being used to provide electrical energy to the charging pile 5000.

[0182] The charging pile 5000 is electrically connected to the battery device 100 in the energy storage device 100 via a cable. The battery device 100 can provide the charging pile 5000 with its stored electrical energy. The charging pile 5000 has one or more connectors 7000 for connecting to electrical equipment (such as vehicles) to replenish the power of the electrical equipment.

[0183] The energy storage device 1000 can be located inside the charging pile 5000 (e.g., an integrated energy storage and charging unit) or outside the charging pile 5000.

[0184] Since the charging network 6000 includes the energy storage device 1000 or the energy storage system 2000 described above, the charging network 6000 has all the beneficial effects of the energy storage device 1000 or the energy storage system 2000. Therefore, the charging network 6000 has high electrical reliability.

[0185] The following describes specific examples of some embodiments of this application with reference to the accompanying drawings.

[0186] As a specific example, a device for balancing pressure with an elastic diaphragm (first device 1) is provided. When the temperature and pressure of the gas inside the device rise, the elastic diaphragm (first component 12) expands outward to reduce the internal pressure of the device. At the same time, it isolates the interaction between the gas and water vapor inside and outside the device, reducing the generation of condensate inside the device and thus reducing the problem of insulation failure.

[0187] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and all should be covered within the scope of the specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way.

Claims

1. An energy storage device, characterized in that, Includes at least one first device, the first device comprising a housing having a sealed space, The enclosure includes a first wall, a first component, and a connecting assembly. The first wall has a mounting hole that connects the sealed space to the outside of the enclosure. The first component is connected to the first wall and seals the mounting hole through the connecting assembly. The pore diameter of the first component is greater than 0 and less than or equal to 0.28 nm. The first component includes an elastic part with an elastic modulus greater than or equal to 0.5 MPa and less than or equal to 50 MPa.

2. The energy storage device according to claim 1, characterized in that, The first component includes an elastic membrane that covers the mounting hole and whose outer peripheral edge is fixed to the first wall.

3. The energy storage device according to claim 2, characterized in that, The mounting hole is a circular hole; and / or, the elastic membrane is a circular membrane.

4. The energy storage device according to claim 2, characterized in that, The elastic membrane is made of rubber.

5. The energy storage device according to claim 4, characterized in that, The elastic membrane is made of EPDM rubber.

6. The energy storage device according to any one of claims 2 to 5, characterized in that, The thickness of the elastic membrane is greater than or equal to 0.005 mm and less than or equal to 10 mm.

7. The energy storage device according to any one of claims 1 to 5, characterized in that, The box is also equipped with a heating element.

8. The energy storage device according to any one of claims 1 to 5, characterized in that, The connecting assembly includes a pressing member and at least one connecting member. The pressing member is connected to the side of the first wall facing the sealed space and / or the side away from the sealed space via the connecting member. The first component is clamped between the pressing member and the first wall.

9. The energy storage device according to claim 8, characterized in that, The pressing element is a ring structure; and / or The connector is provided in at least three parts and is evenly distributed around the mounting hole.

10. The energy storage device according to claim 8, characterized in that, The connector includes a connected rod and a first abutting part. The rod passes through the pressing member and the first component in sequence and is threadedly connected to the first wall. The first abutting part abuts against the surface of the pressing member facing away from the first component.

11. The energy storage device according to any one of claims 1 to 5, characterized in that, The connection component includes: A connector is detachably connected to the first wall body. The connector has a through hole, and the first component blocks the through hole. The through hole is connected to the mounting hole. A seal is provided at the connector and seals the gap between the connector and the first wall.

12. The energy storage device according to claim 11, characterized in that, The connector includes a connecting portion and a second abutting portion connected together. The through hole passes through the connecting portion and the second abutting portion. The connecting portion extends into the mounting hole and is detachably connected to the mounting hole. Along the radial direction of the through hole, the size of the second abutting portion is larger than the size of the mounting hole. An abutting surface facing the first wall is formed between the second abutting portion and the connecting portion. The sealing element is sandwiched between the abutting surface and the first wall.

13. The energy storage device according to claim 12, characterized in that, At least a portion of the outer peripheral surface of the connector is formed with an external thread, the wall of the mounting hole is formed with an internal thread, and the connector is threadedly connected to the mounting hole.

14. The energy storage device according to any one of claims 1 to 5, 9, 10, 12, and 13, characterized in that, At least one of the first devices is a battery device, and the sealed space of the battery device contains at least one battery cell.

15. The energy storage device according to any one of claims 1 to 5, 9, 10, 12, and 13, characterized in that, At least one of the first devices is an electrical control box, and the sealed space of the electrical control box contains a plurality of electronic devices.

16. The energy storage device according to any one of claims 1 to 5, 9, 10, 12, and 13, characterized in that, At least one of the first devices is an electric heater, and the sealed space of the electric heater contains a heating element.

17. An energy storage system, characterized in that, It includes a power conversion device and an energy storage device as described in any one of claims 1 to 16, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

18. 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 16 or an energy storage system as described in claim 17, wherein the energy storage device or the energy storage system is used to provide electrical energy to the charging pile.

Images