Battery device, energy storage device, energy storage system, charging network and power utilization device

Abstract

The utility model relates to a battery device, an energy storage device, an energy storage system, a charging network and a power utilization device. The battery device comprises single batteries and a box body and is provided with an inner cavity for accommodating the single batteries, a pressure relief hole is formed in the box body, and the inner cavity is communicated with the outside of the box body through the pressure relief hole; the flexible isolation piece covers the pressure relief hole; the drying device is arranged on the side, away from the inner cavity, of the flexible isolation piece and communicates with the flexible isolation piece. When the internal pressure and the external pressure of the box body are different, the space volume in the box body can be adjusted through deformation of the flexible isolation piece, so that the internal pressure and the external pressure of the box body are kept the same. And the flexible isolation piece can keep the inside and the outside of the box body isolated, so that moist air is prevented from entering the box body. The drying device can prevent liquid water from appearing on the flexible separator, so that the flexible separator is kept dry, the influence of humid air on the deformation and service life of the flexible separator is reduced, the reliability of the flexible separator for preventing the humid air from entering the box body is further improved, and the insulating property of the battery device is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery device, an energy storage device, an energy storage system, a charging network and a power utilization device. BACKGROUND

[0002] The statements herein merely provide background information related to the present application and do not necessarily constitute the prior art.

[0003] The battery device often uses an explosion-proof valve to balance the air pressure inside and outside the battery device. However, when the external air is humid, the humid air can easily enter the battery device through the explosion-proof valve and form liquid water in the interior of the battery device. The existence of liquid water can easily reduce the insulation performance of the battery device, resulting in insulation failure of the battery device. SUMMARY

[0004] In view of the problems, the present application provides a battery device, an energy storage device, an energy storage system, a charging network and a power utilization device, which can alleviate the problem of reduced or even failed insulation performance of the battery device.

[0005] In a first aspect, the present application provides a battery device, comprising:

[0006] a battery cell, configured to store or release electric quantity;

[0007] a box body having an inner cavity; the inner cavity is configured to accommodate a plurality of battery cells; the box body is provided with a pressure relief hole, which communicates the inner cavity with the outside of the box body;

[0008] a flexible isolation member, covering the pressure relief hole; and

[0009] a drying device, disposed on the side of the flexible isolation member away from the inner cavity and in communication with the flexible isolation member.

[0010] Since the flexible isolation member covers the pressure relief hole which communicates the inner cavity of the box body with the outside of the box body, when the pressure inside and outside the box body is different, the volume of the space inside the box body can be adjusted through the deformation of the flexible isolation member, so that the pressure inside and outside the box body remains the same. Therefore, the flexible isolation member not only replaces the function of the explosion-proof valve, but also can keep the inner cavity of the box body isolated from the outside of the box body when the pressure inside and outside the box body is different, thereby preventing the humid air from entering the inner cavity of the box body. In addition, by disposing the drying device on the side of the flexible isolation member away from the inner cavity of the box body, liquid water can be prevented from appearing on the flexible isolation member, so that the flexible isolation member remains dry, reducing the influence of humid air on the deformation and service life of the flexible isolation member, and further improving the reliability of the flexible isolation member in blocking the humid air from entering the inner cavity of the box body, thereby improving the insulation performance of the battery device.

[0011] In some embodiments, the flexible isolation member comprises a flexible isolation film, and the flexible isolation film covers the pressure relief hole.

[0012] Flexible isolation membranes have excellent extensibility and stronger deformation capacity, thus enabling them to better maintain the same pressure inside and outside the enclosure.

[0013] In some embodiments, the flexible separator is made of one of the following materials: high-density polyethylene, polyurethane, silicone, and EPDM rubber.

[0014] High-density polyethylene, polyurethane, silicone, and EPDM rubber all have good elasticity and are impermeable to air and water, thus better achieving deformation and isolation functions.

[0015] In some embodiments, the drying device includes a housing and a drying element. The housing covers the side of the flexible partition facing away from the inner cavity and communicates with the flexible partition. The drying element is disposed inside the housing.

[0016] By placing the drying element inside the housing and covering it with the flexible insulating element, the contact between the drying element and the outside air can be reduced, allowing the drying element to dry the flexible insulating element within the space limited by the housing, thus improving the drying effect.

[0017] In some embodiments, the drying element and the flexible insulating element are spaced apart to form a first chamber within the housing.

[0018] The first chamber formed by the spacing between the drying component and the flexible isolation component provides space for the flexible isolation component to deform when the internal and external pressures of the chamber are different, thereby improving the reliability of keeping the internal and external pressures of the chamber the same.

[0019] In some embodiments, the outer peripheral wall of the drying element is fitted to the inner peripheral wall of the outer casing, and the drying element is provided with a connecting hole that connects the first chamber to the outside of the outer casing.

[0020] Thus, when the flexible isolator deforms, specifically during the process of the flexible isolator bulging outward or inward, the outer shell will draw in or expel gas. At this time, due to the close fit between the drying component and the outer shell, the gas that is drawn in or expelled needs to pass through the connecting hole of the drying component. Therefore, the gas that is drawn in or expelled can be dried, keeping the flexible isolator in a dry environment.

[0021] In some embodiments, a second chamber is formed between the side of the drying element away from the flexible insulating element and the housing, and the drying device further includes a two-way valve that can connect the second chamber to the outside of the housing.

[0022] The two-way valve is located on the side of the dryer away from the flexible isolation element. This not only protects the dryer and the flexible isolation element from external damage, but also prevents the dryer from drying moisture from the external environment when closed, thus extending the service life of the dryer.

[0023] In some embodiments, the battery device further includes a heating device for heating the drying device.

[0024] When the drying device absorbs moisture due to the flexible insulating parts, its drying effect will be weakened. Therefore, by setting up a heating device to heat the drying device, the absorbed moisture can be evaporated, thereby enabling the drying device to be reused, reducing the need for replacement, and lowering the risk of damage to the housing and electric shock during operation when replacing the drying device.

[0025] In some embodiments, the drying apparatus includes a desiccant, and a heating device is disposed within the desiccant.

[0026] In this way, the heat generated by the heating device can directly reach the desiccant, thereby improving the heating effect of the desiccant and increasing the reliability of its continued use.

[0027] In some embodiments, the heating device includes at least one of a heating plate or a heating film.

[0028] Whether in the form of a heating plate or a heating film, both have a large heating area, thus enabling rapid and more comprehensive heating of the drying device and improving heating efficiency.

[0029] In some embodiments, the battery device further includes a controller, which is communicatively connected to the heating device and is used to control the heating device to start at preset intervals.

[0030] By using a controller to start the heating device at preset intervals, the reliability of the heating and drying device can be improved, ensuring that the drying effect of the device remains effective for a long time.

[0031] In some embodiments, the drying apparatus includes a desiccant, which may include color-changing silica gel desiccant.

[0032] Color-changing silica gel desiccant changes color after absorbing moisture, allowing personnel to replace the desiccant promptly based on the color change.

[0033] In some embodiments, the battery device includes a seal and a clamping member, the seal being disposed around a pressure relief hole and located between the clamping member and a flexible separator.

[0034] Because the seal is arranged around the pressure relief hole and located between the clamping member and the flexible isolator, it can effectively seal the joint between the flexible isolator and the housing after the clamping member is tightened, reducing the entry of humid air into the housing cavity through this joint. Furthermore, the drying device also reduces the erosion of this joint by humid air, preventing damage to the clamping member and the fixing member, thus improving the reliability of the clamping process.

[0035] In some embodiments, the inner cavity includes a receiving cavity and a gas collecting cavity. The battery device also includes multiple battery cells, all of which are disposed in the receiving cavity. The gas collecting cavity is connected to the receiving cavity, and a pressure relief hole is disposed on the cavity wall of the gas collecting cavity.

[0036] The gas collection chamber is a chamber located outside the housing chamber. Since the housing chamber is used to accommodate multiple battery cells, there is relatively little free space for gas inside. By setting up the gas collection chamber, sufficient free space for gas can be provided inside the housing. When the pressure inside and outside the housing is different, enough gas in the gas collection chamber can cause the flexible separator to respond quickly to pressure changes, thereby improving the reliability of the flexible separator in adjusting the volume of space inside the housing.

[0037] Secondly, an energy storage device is provided, including the battery device in any of the above embodiments.

[0038] Thirdly, an energy storage system is provided, including a power conversion device and an energy storage device as described in any of the above embodiments, wherein the power conversion device is used to electrically connect a power generation device and an energy storage device.

[0039] Fourthly, a charging network is provided, including charging piles and energy storage devices or energy storage systems as described in any of the above embodiments, wherein the energy storage devices are used to provide electrical energy to the charging piles.

[0040] Fifthly, an electrical device is provided, including the battery device in any of the above embodiments.

[0041] The aforementioned energy storage devices, energy storage systems, charging networks, and power-consuming devices utilize a flexible insulating element that covers the pressure relief vent connecting the inner cavity of the enclosure to the outside. When the internal and external pressures of the enclosure differ, the deformation of the flexible insulating element adjusts the internal volume, maintaining equal pressure throughout. Therefore, the flexible insulating element not only replaces the function of an explosion-proof valve but also isolates the inner cavity from the outside when pressures differ, preventing humid air from entering the inner cavity. Furthermore, by installing a drying device on the side of the flexible insulating element away from the inner cavity, liquid water can be prevented from forming on the element, keeping it dry and reducing the impact of humid air on its deformation and lifespan. This further improves the reliability of the flexible insulating element in preventing humid air from entering the inner cavity, thereby enhancing the insulation performance of the battery device.

[0042] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[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 schematic diagram of an energy storage device according to one or more embodiments.

[0045] Figure 2 This is a schematic diagram of an energy storage system according to one or more embodiments.

[0046] Figure 3 This is a schematic diagram of a charging network according to one or more embodiments.

[0047] Figure 4 This is an exploded structural diagram of a battery device according to one or more embodiments.

[0048] Figure 5 This is an exploded structural diagram of a battery cell according to one or more embodiments.

[0049] Figure 6 This is a schematic diagram of a battery device according to one or more embodiments.

[0050] Figure 7 for Figure 6 The diagram shows a flexible separator bulging outwards in the battery device.

[0051] Figure 8 for Figure 6 The diagram shows a flexible separator in the battery device that bulges inward.

[0052] Figure 9 This is a schematic diagram of a portion of the structure of a battery device according to one or more embodiments.

[0053] Figure 10 This is a schematic diagram of the structure of a clamping member in a battery device according to one or more embodiments.

[0054] The reference numerals in the detailed embodiments are as follows:

[0055] Energy storage device 1000, battery device 100, housing 10, first part 11, second part 12, inner cavity 13, receiving cavity 131, gas collecting cavity 132, pressure relief hole 14, battery cell 20, end cap 21, electrode terminal 211, shell 22, cell assembly 23, flexible separator 30, drying device 40, outer shell 41, drying component 42, desiccant 421, drying box 422, connecting hole 4221, two-way valve 43, sealing component 50, clamping component 55, heating device 60, heating plate 61, cabinet 200, power conversion equipment 2000, power generation equipment 3000, charging pile 4000, connector 5000. Detailed Implementation

[0056] 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.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0058] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0059] 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.

[0060] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, 1 and / or 2 can represent: 1 existing alone, 1 and 2 existing simultaneously, and 2 existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following associated objects have an "or" relationship.

[0061] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0062] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0064] New energy batteries are being used more and more widely in daily life and industry. For example, new energy vehicles equipped with battery devices are already widely used. In addition, battery devices are being increasingly used in the field of energy storage.

[0065] The battery pack includes a housing and multiple battery cells housed within it. Typically, an explosion-proof valve is installed on the housing to balance the pressure inside and outside the housing. These explosion-proof valves in related technologies are designed to open when there is a pressure difference between the inside and outside of the housing, thus maintaining equal pressure.

[0066] However, when the ambient humidity outside the battery device is high, humid air will enter the box, and water molecules will diffuse into the inside of the box. The battery device box is usually equipped with a cooling device to dissipate heat and cool the individual battery cells. When water molecules encounter cold air or the cooling device, they will condense inside the box to form liquid water, thus reducing the insulation performance of the battery device.

[0067] To alleviate the problem of reduced insulation performance of battery devices due to the installation of explosion-proof valves, this application provides a battery device including a housing, a flexible separator, and a drying device. The housing has an inner cavity and a pressure relief hole that connects the inner cavity to the outside of the housing. The flexible separator covers the pressure relief hole. The drying device is disposed on the side of the flexible separator opposite to the inner cavity, and the two are interconnected.

[0068] Thus, because the flexible separator covers the pressure relief vent connecting the inner cavity of the enclosure to the outside, when the internal and external pressures of the enclosure differ, the deformation of the flexible separator can adjust the internal volume of the enclosure, thereby maintaining the same internal and external pressures. Therefore, the flexible separator not only replaces the function of an explosion-proof valve but also isolates the inner cavity from the outside when the internal and external pressures differ, preventing humid air from entering the inner cavity. Furthermore, by installing a drying device on the side of the flexible separator away from the inner cavity, liquid water can be prevented from forming on the flexible separator, keeping it dry and reducing the impact of humid air on its deformation and lifespan. This further improves the reliability of the flexible separator in preventing humid air from entering the inner cavity, thereby enhancing the insulation performance of the battery device.

[0069] The battery device provided in this application embodiment can be used in energy storage devices, energy storage systems, and charging networks, and can also be used in electrical devices such as mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, and spacecraft. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0070] The following is a description of the energy storage device, energy storage system, and charging network in the embodiments of this application.

[0071] See Figure 1 This application provides an energy storage device 1000, including one or more battery clusters to improve the voltage and capacity of the energy storage device 1000. The battery cluster may include multiple battery devices 100, which are connected in series via a busbar to increase the voltage of the energy storage device 1000. When the energy storage device 1000 includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device 1000. Details of the battery devices 100 are provided below.

[0072] The energy storage device 1000 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. The energy storage device 1000 can store electrical energy as needed and output it when appropriate. For example, the energy storage device 1000 can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. The energy storage system provided in this application embodiment can be any power system that requires the energy storage device 1000.

[0073] In some embodiments, the energy storage device 1000 is an energy storage container or an energy storage cabinet.

[0074] In some embodiments, the energy storage device 1000 may include a cabinet 200 and one or more battery clusters, the battery clusters being housed in the cabinet 200.

[0075] In some embodiments, the energy storage device 1000 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.

[0076] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device 100 via piping to regulate the temperature of the individual battery cells 20.

[0077] 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.

[0078] 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.

[0079] As an example, a fire protection system includes control panels, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in energy storage systems.

[0080] As an example, the power distribution unit can be used to distribute power to the power modules of the energy storage device.

[0081] See Figure 2 In some embodiments, the energy storage system may include one or more energy storage devices 1000 and a power conversion system (PCS) 2000, which is connected between the power generation device 3000 and the energy storage device 1000. The power generation device 3000 generates electrical energy, which can be stored in the energy storage device 1000 via the power conversion system 2000, and the electrical energy stored in the energy storage device 1000 can be released back to the power generation device 3000 via the power conversion system 2000. As an example, the power generation device 3000 may specifically be a power grid, solar panels, hydroelectric power generation equipment, thermal power generation equipment, wind power generation equipment, etc. The specific type of the power generation device 3000 is not limited in this application.

[0082] See Figure 3 This application provides a charging network including a charging pile 4000 and an energy storage device 1000. The charging pile 4000 is electrically connected to the energy storage device 1000, which provides electrical energy to the charging pile 4000. The charging pile 4000 is electrically connected to a battery device 100 in the energy storage device 1000 via a cable, and the battery device 100 can provide its stored electrical energy to the charging pile 4000. The charging pile 4000 has one or more connectors 5000 for connecting to an electrical device (such as a vehicle) to replenish its power. The definition of the battery device 100 is detailed below.

[0083] The energy storage device 1000 can be located inside the charging pile (e.g., an integrated energy storage and charging unit) or outside the charging pile.

[0084] Please refer to Figure 4 , Figure 4This is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 provides a space for accommodating the battery cell 20, and the housing 10 can adopt various structures. In some embodiments, the housing 10 may include a first portion 11 and a second portion 12, which overlap each other, jointly defining a space for accommodating the battery cell 20. The second portion 12 may be a hollow structure with one open end, and the first portion 11 may be a plate-like structure, covering the open side of the second portion 12 so that the first portion 11 and the second portion 12 jointly define the space; alternatively, the first portion 11 and the second portion 12 may both be hollow structures with one open side, with the open side of the first portion 11 covering the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can be of various shapes, such as a cylinder, a cuboid, etc.

[0085] In the battery device 100, there can be multiple battery cells 20, which 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 connections. 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 housed within the housing 10. 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 battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within the housing 10. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0086] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0087] Please refer to Figure 5 , Figure 5 This is an exploded structural diagram of a battery cell 20 provided in some embodiments of this application. The battery cell 20 refers to the smallest unit that makes up a battery. Figure 5 The battery cell 20 includes an end cap 21, a housing 22, a cell assembly 23, and other functional components.

[0088] End cap 21 refers to a component that covers the opening of housing 22 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 21 can be adapted to the shape of housing 22 to fit it. Optionally, end cap 21 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 21 is not easily deformed under pressure and impact, allowing battery cell 20 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 211 can be provided on end cap 21. Electrode terminals 211 can be used for electrical connection with cell assembly 23 to output or input electrical energy to battery cell 20. In some embodiments, end cap 21 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 20 reaches a threshold. The material of end cap 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the end cap 21. The insulating element can be used to isolate the electrical connection components within the housing 22 from the end cap 21 to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.

[0089] The housing 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20. This internal environment can accommodate the cell assembly 23, electrolyte, and other components. The housing 22 and the end cap 21 can be independent components. An opening can be provided on the housing 22, and the end cap 21 can be used to close the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 21 and the housing 22 can be integrated. Specifically, the end cap 21 and the housing 22 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 22, the end cap 21 closes the housing 22. The housing 22 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the cell assembly 23. The material of the housing 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special limitations on this.

[0090] The cell assembly 23 is the component in the battery cell 20 where the electrochemical reaction occurs. The casing 22 may contain one or more cell assemblies 23. The cell assembly 23 mainly consists of positive and negative electrode materials, a separator, and a current collector. Specifically, positive electrode material is coated onto the battery output terminal connector to form a positive electrode sheet, and negative electrode material is coated onto the battery output terminal connector to form a negative electrode sheet. The positive and negative electrode sheets are wound or stacked, and the separator is disposed between the positive and negative electrode sheets, thus forming the cell assembly 23. The portions of the positive and negative electrode sheets containing active material constitute the main body of the cell assembly, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs can be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current loop.

[0091] Figure 6 This is a schematic diagram of a battery device according to one or more embodiments. Referring to the accompanying drawings, an embodiment of this application provides a battery device 100, including a battery cell 20, a housing 10, a flexible separator 30, and a drying device 40. The housing 10 has an inner cavity 13 for accommodating multiple battery cells 20. A pressure relief hole 14 is provided on the housing 10, which connects the inner cavity 13 to the outside of the housing 10. The flexible separator 30 covers the pressure relief hole 14. The drying device 40 is disposed on the side of the flexible separator 30 opposite to the inner cavity 13 and the two are in communication.

[0092] Flexible spacer 30 refers to a spacer component that is flexible. Flexibility here means having good elastic deformation capability. (Refer to...) Figure 7 and Figure 8 For example, when the pressure inside the cavity 13 of the housing 10 is greater than the external pressure of the housing 10, the flexible insulating member 30 can expand outwards to increase the internal space of the housing 10 and reduce the pressure inside the housing 10, thus keeping the internal and external pressures the same. When the pressure inside the cavity 13 of the housing 10 is less than the external pressure of the housing 10, the flexible insulating member 30 can expand inwards to decrease the internal space of the housing 10 and increase the pressure inside the housing 10, thus keeping the internal and external pressures the same.

[0093] The isolation function of the flexible isolation element 30 is to seal the pressure relief hole 14 to isolate the inside and outside of the housing 10. In this way, air can hardly enter or exit the inner cavity 13 through the pressure relief hole 14 due to the blocking effect of the flexible isolation element 30.

[0094] The flexible isolation element 30 can be fixed to the housing 10 by connecting it to the housing wall, thereby covering the pressure relief hole 14. For example, the flexible isolation element 30 can be fixed to the housing 10 by adhesive bonding. Of course, the flexible isolation element 30 can also be fixed to the housing 10 by other installation methods, as detailed in the following embodiments.

[0095] Since the drying device 40 connects to the side of the flexible isolation member 30 that faces away from the inner cavity 13 of the housing 10, it can dry the side of the flexible isolation member 30 that faces the external environment. The drying range of the drying device 40 is not limited to drying only the flexible isolation member 30; depending on the specific arrangement of the drying device 40, other components around the flexible isolation member 30 can also be dried.

[0096] Thus, since the flexible insulating member 30 covers the pressure relief hole 14 connecting the inner cavity 13 of the housing 10 and the outside of the housing 10, when the internal and external pressures of the housing 10 are different, the deformation of the flexible insulating member 30 can adjust the volume of the space inside the housing 10, thereby keeping the internal and external pressures of the housing 10 the same. Therefore, the flexible insulating member 30 not only replaces the function of the explosion-proof valve, but also isolates the inner cavity 13 of the housing 10 from the outside of the housing 10 when the internal and external pressures of the housing 10 are different, thus preventing humid air from entering the inner cavity 13 of the housing 10. In addition, by setting a drying device 40 on the side of the flexible insulating member 30 away from the inner cavity 13 of the housing 10, liquid water can be prevented from appearing on the flexible insulating member 30, keeping the flexible insulating member 30 dry, reducing the impact of humid air on the deformation and lifespan of the flexible insulating member 30, further improving the reliability of the flexible insulating member 30 in preventing humid air from entering the inner cavity 13 of the housing 10, thereby improving the insulation performance of the battery device 100.

[0097] According to some embodiments of this application, the flexible isolation member 30 includes a flexible isolation membrane that covers the pressure relief hole 14.

[0098] The flexible isolation membrane has excellent extensibility and stronger deformation capability, thus it can better maintain the same internal and external pressure in the housing 10.

[0099] Specifically, the flexible barrier membrane can be in the form of a smooth sheet. In other embodiments, it can also be configured as a folded form, so that when deformation occurs, the flexible barrier membrane can open or bulge along the folds, thus providing a larger deformation space.

[0100] According to some embodiments of this application, the material of the flexible separator can be one of high-density polyethylene, polyurethane, silicone, or EPDM rubber.

[0101] High-density polyethylene, polyurethane, silicone, and EPDM rubber all have good elasticity and are impermeable to air and water, thus better achieving deformation and isolation functions.

[0102] Reference Figure 9 According to some embodiments of this application, the battery device 100 further includes a seal 50 and a clamping member 55, the seal 50 being disposed around the pressure relief hole 14 and located between the clamping member 55 and the flexible separator 30.

[0103] The clamping member 55 is capable of pressing the seal 50 and the flexible spacer 30 against the wall of the housing 10. Figure 10 The clamping element 55 can be ring-shaped, specifically a steel ring, which is fixed to the box wall of the box body 10 by bolts or other fasteners.

[0104] Since the sealing element 50 is arranged around the pressure relief hole 14 and located between the clamping element 55 and the flexible isolation element 30, it can effectively seal the joint between the flexible isolation element 30 and the housing 10 after the clamping element 55 is tightened, reducing the entry of humid air into the inner cavity 13 of the housing 10 from this joint. In addition, the installation of the drying device 40 can also reduce the erosion of the joint by humid air, thereby reducing the damage to the clamping element 55 and the fastener, and improving the reliability of the clamping.

[0105] It should be noted that, compared to the method of fixing the flexible isolation element 30 to the box body 10 by bonding it, the method of using the sealing element 50 and the clamping element 55 can better seal the joint between the flexible isolation element 30 and the box body 10, and the fixation of the flexible isolation element 30 relative to the box body 10 is not easily affected by the external environment and has a long service life.

[0106] According to some embodiments of this application, the drying device 40 includes a housing 41 and a drying element 42, the drying element 42 being disposed inside the housing 41, and the housing 41 covering the side of the flexible isolation element 30 opposite to the inner cavity 13.

[0107] Drying component 42 refers to a component capable of drying the flexible insulating component 30.

[0108] By placing the drying element 42 inside the housing 41 and covering the flexible isolation element 30 with the housing 41, the contact between the drying element 42 and the outside air can be reduced, allowing the drying element 42 to dry the flexible isolation element 30 within the space limited by the housing 41, thereby improving the drying effect.

[0109] Specifically, the outer shell 41 can be a cylindrical shape with an opening at one end, which corresponds to the flexible isolation member 30, and the outer shell can be connected to the outer wall of the housing 10.

[0110] According to some embodiments of this application, the drying element 42 and the flexible insulating element 30 are spaced apart to form a first chamber a within the housing 41.

[0111] The first chamber a formed by the spacing between the drying component 42 and the flexible isolation component 30 provides space for the flexible isolation component 30 to deform when the internal and external pressures of the housing 10 are different, thereby improving the reliability of keeping the internal and external pressures of the housing 10 the same.

[0112] Specifically, the outer peripheral wall of the drying component 42 is in contact with the inner peripheral wall of the outer shell 41, and the drying component 42 is provided with a connecting hole 4221, which connects the first chamber a with the outside of the outer shell 41.

[0113] Thus, when the flexible isolator 30 deforms, specifically during the process of the flexible isolator 30 bulging outward or inward, the outer shell 41 will draw in or expel gas. At this time, due to the close fit between the drying element 42 and the outer shell 41, the gas that is drawn in or expelled needs to pass through the connecting hole 4221 of the drying element 42. Therefore, the gas that is drawn in or expelled can be dried, keeping the flexible isolator 30 in a dry environment.

[0114] In the embodiments of this application, the drying component 42 includes a desiccant 421 and a drying box 422. The desiccant 421 is placed inside the drying box 422, and the drying box 422 has a plurality of connecting holes 4221. Each connecting hole 4221 connects the first chamber a, the desiccant 421, and the outside of the outer shell 41. The portion where the outer peripheral wall of the drying component 42 fits against the inner peripheral wall of the outer shell 41 can be achieved by fitting the outer peripheral wall of the drying box 422 against the inner peripheral wall of the outer shell 41.

[0115] In other embodiments, the drying device may also dry the product by means other than the desiccant 421, such as heating, air drying, etc.

[0116] According to some embodiments of this application, a second chamber b is formed between the side of the drying member 42 away from the flexible isolation member 30 and the outer casing 41. The drying device 40 also includes a two-way valve 43, which is capable of connecting the second chamber b to the outside of the outer casing 41.

[0117] It should be noted that the first chamber a is connected to the second chamber b through the connecting hole 4221.

[0118] The two-way valve 43 refers to a valve body capable of controlling fluid flow in two directions. Specifically, when the flexible isolator 30 bulges outward, the two-way valve 43 opens to balance the air pressure inside and outside the housing 41, thereby leveling the air pressure on both sides of the flexible isolator 30. When the flexible isolator 30 bulges inward, the two-way valve 43 also opens to balance the air pressure inside and outside the housing 41, thereby leveling the air pressure on both sides of the flexible isolator 30. When the flexible isolator 30 is not deformed and does not move, the two-way valve 43 closes, preventing moisture outside the housing 41 from contacting the drying element 42.

[0119] Therefore, the two-way valve 43 is located on the side of the dryer 42 away from the flexible isolation member 30, which not only protects the dryer 42 and the flexible isolation member 30 from damage by external forces, but also prevents the dryer 42 from drying the moisture in the external environment when closed, thus delaying the service life of the dryer 42.

[0120] In the specific implementation of this application, the two-way valve 43 is a low-threshold two-way valve with a pressure threshold range of 0.01MPa-0.03MPa.

[0121] According to some embodiments of this application, the battery device 100 further includes a heating device 60 for heating the drying device 40.

[0122] Heating device 60 refers to a device that can generate heat to heat an object.

[0123] When the drying device 40 absorbs moisture due to the drying flexible isolation element 30, the drying effect of the drying device 40 will be weakened. Therefore, by setting the heating device 60 to heat the drying device 40, the moisture absorbed in the drying device 40 can be evaporated, thereby realizing the recycling of the drying device 40, reducing the replacement of the drying device 40, and reducing the risk of damage to the housing 10 and electric shock during operation when replacing the drying device 40.

[0124] Furthermore, the drying device 40 includes a desiccant 421, and a heating device 60 is disposed in the desiccant 421.

[0125] The heating device 60 is disposed in the desiccant 421, which means that the desiccant 421 covers the outer periphery of the heating device 60. This covering method can cover the entire outer surface of the heating device 60 or cover part of the outer surface of the heating device 60.

[0126] In this way, the heat generated by the heating device 60 can directly reach the desiccant 421, thereby improving the heating effect of the desiccant 421 and increasing the reliability of the desiccant 421 for continued use.

[0127] According to some embodiments of this application, the heating device 60 includes at least one of a heating plate 61 or a heating film.

[0128] Heating plate 61 refers to a heating element with a plate-like structure. Typically, the material of heating plate 61 can be any of ceramic, metal, semiconductor, silicone, or carbon fiber. During operation, heating plate 61 converts electrical energy into heat energy, thereby rapidly increasing the temperature.

[0129] A heating film is formed by creating a conductive thin film on the surface of an insulating material. When electricity is applied, the conductive particles on the film generate heat, thus achieving the heating function. The heating film can be made of any of the following materials: graphene, metal wire, or carbon fiber.

[0130] Whether it is a heating plate 61 or a heating film, it has a large heating area, thus enabling rapid and more comprehensive heating of the drying device 40 and improving heating efficiency.

[0131] According to some embodiments of this application, the battery device 100 also includes a controller, which is communicatively connected to the heating device 60 and is used to control the heating device 60 to start at a preset interval.

[0132] The preset interval time can be pre-set, or different interval times can be set according to the ambient humidity of the battery device 100. For example, when the ambient humidity of the battery device 100 is high, T1 can be set as the preset interval time, and when the ambient humidity of the battery device 100 is low, T2 can be set as the preset interval time, where T1 is less than T2.

[0133] By activating the heating device 60 at preset intervals using a controller, the reliability of the heating and drying device 40 can be improved, ensuring the long-term effectiveness of the drying effect.

[0134] According to some embodiments of this application, the drying device 40 includes a desiccant 421, which includes a color-changing silica gel desiccant.

[0135] The main component of color-changing silica gel is cobalt chloride, which has a strong adsorption effect on water vapor. At the same time, it can display different colors by changing the amount of cobalt chloride crystal water it contains. That is, it gradually changes from blue before moisture absorption to light red as the amount of moisture absorbed increases. After the color-changing silica gel absorbs moisture, the moisture can be removed by heating and desorption, so it can be reused.

[0136] In this way, the color-changing silica gel desiccant can change color after absorbing moisture, allowing personnel to replace the desiccant 421 in a timely manner based on the color change.

[0137] Furthermore, a viewing window area can be provided on the outer casing 41 or the drying box 422 to clearly observe the color change of the desiccant 421. For example, a portion of the outer casing 41 or the drying box 422 can be made of a transparent material to form the viewing window area. Of course, the outer casing 41 or the drying box 422 can also be made directly of a transparent material so that the color change of the desiccant 421 can be observed from multiple angles.

[0138] According to some embodiments of this application, the inner cavity 13 of the housing 10 includes a receiving cavity 131 and a gas collecting cavity 132. The battery device 100 also includes a plurality of battery cells 20. All battery cells 20 are disposed in the receiving cavity 131. The gas collecting cavity 132 is connected to the receiving cavity 131. The pressure relief hole 14 is disposed on the cavity wall of the gas collecting cavity 132.

[0139] The gas collecting chamber 132 is a chamber located outside the receiving chamber 131. Since the receiving chamber 131 is used to accommodate multiple battery cells 20, the free space for gas inside is relatively small. By setting up the gas collecting chamber 132, sufficient free space for gas can be provided inside the housing 10. When the internal and external pressures of the housing 10 are different, the sufficient amount of gas in the gas collecting chamber 132 can cause the flexible separator 30 to respond quickly to pressure changes, thereby improving the reliability of the flexible separator 30 in adjusting the volume of space inside the housing 10.

[0140] According to some embodiments of this application, refer to Figures 6-10 A battery device 100 is provided, including a housing 10, a flexible separator 30, a drying device 40, and a heating device 60. The housing 10 has a receiving cavity 131 and a gas collecting cavity 132. The receiving cavity 131 is used to accommodate all battery cells 20. The gas collecting cavity 132 communicates with the receiving cavity 131. A pressure relief hole 14 is formed on the cavity wall of the gas collecting cavity 132, and the pressure relief hole 14 communicates with the outside of the housing 10. The flexible separator 30 covers the pressure relief hole 14 and is fixed to the housing 10 by a sealing ring and a clamping ring. The drying device 40 includes a housing 41 and a drying element 42. The drying element 42 is disposed inside the housing 41, and the housing 41 covers the side of the flexible separator 30 opposite to the inner cavity 13, and the two are in communication. The drying element 42 includes a desiccant 421 and a drying box 422, with the desiccant 421 placed inside the drying box 422. The drying component 42 has a first chamber a and a second chamber b formed on its two sides. The first chamber a provides space for the flexible isolation component 30 to deform. The second chamber b is connected to the outside of the outer shell 41 through a two-way valve 43 provided on the outer shell 41. The drying component 42 has a connecting hole 4221 that connects the first chamber a and the second chamber b. In addition, the heating device 60 includes a heating plate 61, which is disposed in the desiccant 421 and can be activated at preset intervals.

[0141] In addition, this application also provides an electrical device, including the battery device 100 in any of the above embodiments.

[0142] Because the flexible insulating element 30 covers the pressure relief hole 14 connecting the inner cavity 13 of the housing 10 and the outside of the housing 10, when the internal and external pressures of the housing 10 are different, the deformation of the flexible insulating element 30 can adjust the volume of the space inside the housing 10, thus keeping the internal and external pressures of the housing 10 the same. Therefore, the flexible insulating element 30 not only replaces the function of the explosion-proof valve, but also isolates the inner cavity 13 of the housing 10 from the outside of the housing 10 when the internal and external pressures are different, thus preventing humid air from entering the inner cavity 13 of the housing 10. In addition, by setting a drying device 40 on the side of the flexible insulating element 30 away from the inner cavity 13 of the housing 10, liquid water can be prevented from appearing on the flexible insulating element 30, keeping the flexible insulating element 30 dry, reducing the impact of humid air on the deformation and lifespan of the flexible insulating element 30, further improving the reliability of the flexible insulating element 30 in preventing humid air from entering the inner cavity 13 of the housing 10, thereby improving the insulation performance of the battery device 100.

[0143] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized by, The battery device comprises: a battery cell for storing or releasing electric energy; a box having an inner cavity for accommodating a plurality of battery cells; a relief hole is arranged on the box and communicates the inner cavity with the outside of the box; a flexible isolation member covers the relief hole; and a drying device is arranged on the side of the flexible isolation member away from the inner cavity and communicates with the flexible isolation member. The flexible isolation member comprises a flexible isolation film covering the relief hole.

2. The battery device according to claim 1, characterized by The flexible isolation film is made of one of high-density polyethylene, polyurethane, silica gel and ethylene-propylene-diene rubber.

3. The battery device of claim 2, wherein The drying device comprises a shell and a drying member, the shell is arranged on the side of the flexible isolation member away from the inner cavity and communicates with the flexible isolation member, and the drying member is arranged in the shell.

4. The battery device of claim 1, wherein The drying member is arranged apart from the flexible isolation member to form a first cavity in the shell.

5. The battery device of claim 4, wherein, The outer peripheral wall of the drying member is attached to the inner peripheral wall of the shell, and the drying member is provided with a communication hole communicating the first cavity with the outside of the shell.

6. The battery device of claim 5, wherein A second cavity is formed between the side of the drying member away from the flexible isolation member and the shell, and the drying device further comprises a bidirectional valve capable of communicating the second cavity with the outside of the shell.

7. The battery device of claim 6, wherein The battery device further comprises a heating device for heating the drying device.

8. The battery device according to any one of claims 1 to 7, characterized by The drying device comprises a drying agent, and the heating device is arranged in the drying agent.

9. The battery device of claim 8, wherein, The heating device comprises at least one of a heating plate and a heating film.

10. The battery device of claim 8, wherein, The battery device further comprises a controller in communication with the heating device for controlling the heating device to start at a preset interval.

11. The battery device of claim 8, wherein, The drying device comprises a drying agent, and the drying agent comprises a color-changing silica gel drying agent.

12. The battery device according to any one of claims 1 to 7, wherein The battery device comprises a sealing member and a pressing member, the sealing member is arranged around the relief hole and is located between the pressing member and the flexible isolation member.

13. The battery device according to any one of claims 1 to 7, wherein The inner cavity comprises an accommodating cavity and a gas collecting cavity, the battery device further comprises a plurality of battery cells, all the battery cells are arranged in the accommodating cavity, the gas collecting cavity communicates with the accommodating cavity, and the relief hole is arranged on the cavity wall of the gas collecting cavity.

14. The battery device according to any one of claims 1 to 7, wherein The battery device comprises any one of claims 1-14.

15. An energy storage device, characterized by, The power conversion device is used for electrically connecting a power generation device and the energy storage device.

16. An energy storage system characterized by, The charging pile is provided with the energy storage device or the energy storage system.

17. A charging network characterized in that, The battery device comprises any one of claims 1-14.

18. An electrical device, comprising: ​

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