Battery device and electric device

Abstract

The utility model relates to a battery device and a power utilization device. The battery device comprises a box body and a battery monomer, the box body comprises a wall body, and the wall body is enclosed to form a containing cavity; the battery monomers are accommodated in the accommodating cavities; wherein at least part of the wall body is internally provided with a filling cavity, and the filling cavity is filled with a heat preservation structure. The heat preservation structure arranged in the wall body of the box body provided by the embodiment of the utility model can prevent external cold air from entering the box body and carrying out heat exchange, so that heat in the box body is not lost as much as possible, heat preservation is carried out on the box body, and an environment with a proper temperature is provided for the battery monomers.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery device and a power utilization device. BACKGROUND

[0002] During use, a battery pack is easily affected by the external environment. The temperature of the external environment affects the chemical reaction speed inside the battery pack. In order to reduce the influence of the external environment on the battery pack, a heat preservation structure is generally arranged in the battery pack to perform heat insulation and heat preservation treatment.

[0003] At present, the heat preservation effect of the heat preservation structure arranged in the battery pack in a low temperature environment is poor, which affects the use performance of the battery pack box. CONTENT OF THE INVENTION

[0004] In view of the above problems, the present application provides a battery device and a power utilization device, which can improve the problem that the heat preservation effect of the box of the battery device is poor when used in a low temperature environment.

[0005] In a first aspect, the present application provides a battery pack device, which comprises a box and a battery monomer. The box comprises a wall body, and the wall body encloses a containing cavity. The battery monomer is contained in the containing cavity. At least part of the wall body is internally provided with a filling cavity, and the filling cavity is filled with a heat preservation structure.

[0006] The heat preservation structure arranged in the wall body of the box can block the cold air of the external environment from entering the box of the battery device and performing heat exchange, so as to make the heat in the box as little as possible to be lost, to heat preserve the box, and to provide a temperature suitable environment for the battery monomer.

[0007] In some embodiments, the heat preservation structure is internally provided with a vacuum cavity.

[0008] In this way, the structure of the heat preservation structure is simplified, and the processing difficulty of the heat preservation structure is reduced.

[0009] In some embodiments, the heat preservation structure comprises a plurality of heat preservation units, all the heat preservation units are embedded in the filling cavity, and the internal part of each heat preservation unit is provided with a vacuum cavity.

[0010] The above arrangement can flexibly arrange the heat preservation units without affecting the supporting effect of the wall body, and improve the heat insulation and heat preservation effect of the wall body.

[0011] In some embodiments, the structure of the heat preservation unit is configured as a spherical structure.

[0012] In this way, the volume of the vacuum cavity in the heat preservation unit can be increased while the volume of the heat preservation unit is as small as possible, thereby improving the heat insulation capacity of the heat preservation structure. In addition, the spherical structure is easy to install, and the probability of interference and wear with other components during assembly is reduced.

[0013] In some embodiments, the heat preservation unit comprises a spherical core and a spherical shell, the spherical shell is wrapped outside the spherical core, the spherical core is made of foaming material, and the inside is enclosed to form a vacuum cavity.

[0014] In this way, the heat preservation unit is provided with a spherical core and a spherical shell, and the materials of the spherical core and the spherical shell are limited respectively, so that the shape of the heat preservation unit is limited while the spherical core is vacuumized, and the vacuum cavity is prevented from collapsing.

[0015] In some embodiments, the spherical shell is configured as a multi-layer structure.

[0016] In this way, the functions of each layer are enriched, thereby widening the applicable environment of the spherical shell.

[0017] In some embodiments, along the thickness direction of the spherical shell, the spherical shell comprises a puncture-resistant layer, an aluminum layer and a sealing layer arranged in layers.

[0018] In this way, the functions of the spherical shell are enriched, and the service life of the spherical shell is prolonged.

[0019] In some embodiments, the puncture-resistant layer is configured as a nylon piece.

[0020] In this way, the difficulty of obtaining the puncture-resistant piece is reduced, and the puncture-resistant layer is easy to prepare.

[0021] In some embodiments, the spherical shell is configured by heat sealing or welding.

[0022] In this way, the connection stability of the sealing of the membrane layer inside the spherical shell can be improved, and the probability of cracking at the sealing of the membrane layer is reduced.

[0023] In some embodiments, the heat preservation structure comprises a mounting piece, and the mounting piece is wrapped outside all the heat preservation units.

[0024] In this way, the mounting piece can block the external components from directly contacting the heat preservation unit, reduce the probability of the external components directly piercing the heat preservation unit, and protect the heat preservation unit. In addition, even if the heat preservation unit is damaged, the space in the mounting piece for assembling the heat preservation unit is still in a vacuum state, which does not affect the use of the heat preservation structure. Furthermore, after wrapping all the heat preservation units with the mounting piece, they can be installed in the wall body together. Compared with installing single heat preservation units in the wall body one by one, the steps of installing the heat preservation structure in the wall body are simplified, and the time of installing the heat preservation structure in the wall body is shortened.

[0025] In some embodiments, the structure of the mount is configured as a thin film.

[0026] Due to the film's thinness and good flexibility, it can be deformed to the shape of the insulation structure, thus completely fitting the outer wall of the insulation structure. Furthermore, it does not significantly increase the thickness of the insulation structure, making it easier to install the insulation structure within a thinner wall and reducing the weight of the insulation structure, achieving lightweight design.

[0027] In some embodiments, the mounting member includes a first portion and a second portion, the first portion and the second portion are sealingly connected and together wrap the thermal insulation unit.

[0028] When installing the heat preservation unit, all the heat preservation units are placed on the first part, and then the second part and the first part are covered together to wrap all the heat preservation units, which reduces the difficulty of installing the heat preservation unit.

[0029] In some embodiments, along the thickness direction of the film, both the first portion and the second portion are constructed as a multi-layer structure.

[0030] Such an arrangement can enrich the functions of the first part and the second part, thereby broadening the applicable environments of the mounting member.

[0031] In some embodiments, a plurality of thermal insulation structures are stacked inside the wall along the wall thickness direction.

[0032] In this way, multiple thermal insulation structures are stacked in the wall body to further improve the thermal insulation effect of the battery pack box.

[0033] In some embodiments, in a direction perpendicular to the wall, the orthographic projection of the thermal insulation structure on the wall coincides with the area where the battery cells are located.

[0034] In this way, the thermal insulation structure can be evenly distributed in various parts of the wall, so that the thermal insulation capacity of various parts of the wall is relatively consistent.

[0035] In a second aspect, the present application provides an electrical device, which includes the battery device in the above embodiment.

[0036] When the battery device is used in a low-temperature environment, the insulation structure set in the wall of the box can prevent the outside cold air from entering the battery pack box and perform heat exchange, so that the heat in the box is not lost as much as possible, the box is insulated, and thus a temperature-suitable environment is provided for the battery cells.

[0037] The above description is merely a general description of the technical solutions of the present application. In order to enable one of ordinary skill in the art to better implement the technical solutions of the present application, the contents of the specification can be implemented, and in order to enable the above and other purposes, features and advantages of the present application to be more apparent and understandable, the specific embodiments of the present application are described below. BRIEF DESCRIPTION OF DRAWINGS

[0038] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a better understanding of the preferred embodiments, and are not to be considered as limiting of the present application. Moreover, in the drawings, like reference numerals denote same or similar components. In the drawings:

[0039] Figure 1 is a structural schematic view of a vehicle according to one or more embodiments.

[0040] Figure 2 is an exploded view of a battery device according to one or more embodiments.

[0041] Figure 3 is an exploded structural schematic view of a battery cell according to one or more embodiments.

[0042] Figure 4 is a structural schematic view of a battery pack case hidden part structure according to one or more embodiments.

[0043] Figure 5 is a cross-sectional view of a battery pack case hidden part structure according to one or more embodiments.

[0044] Figure 6 is Figure 5 is an enlarged view of A in FIG.

[0045] Figure 7 is a structural schematic view of a thermal insulation structure of a battery pack case according to one or more embodiments.

[0046] Figure 8 is a structural schematic view of a thermal insulation structure of a battery pack case according to one or more embodiments.

[0047] Reference numerals in the detailed description are as follows:

[0048] 1000, vehicle;

[0049] 100, battery device; 200, controller; 300, motor; 10, case; 11, wall; 12, thermal insulation structure; 121, thermal insulation unit; 122, mounting; 20, battery cell; 21, end cover; 21a, electrode terminal; 22, housing; 23, cell assembly; X, first direction. DETAILED DESCRIPTION

[0050] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0052] In the description of the embodiments of this application, the use of technical terms such as "first" and "second" is solely for distinguishing different objects and should not be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order, or primary and secondary relationship of the technical features indicated. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise specifically defined.

[0053] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0054] In the description of the embodiments of this application, the term "and / or" is used to describe the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document, if it appears, generally indicates that the related objects are in an "or" relationship.

[0055] In the description of the embodiments of the present application, if it appears, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0056] In the description of the embodiments of the present application, if any, technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present 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 and operated in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0057] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0058] Currently, market developments indicate that battery applications are becoming increasingly widespread. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As battery applications continue to expand, market demand is also growing.

[0059] When a battery device is used in high latitudes or high altitudes, excessively low temperatures may affect the chemical reaction rate of the battery cells within the battery device, thereby affecting the service life and capacity of the battery cells.

[0060] To enable a battery device to adapt to low-temperature environments, some embodiments of the present application provide a battery device with a thermal insulation structure within the walls of the housing. This thermal insulation structure can prevent cold air from entering the housing and facilitate heat exchange. The walls of the housing enclose a space with a suitable temperature, thereby providing a temperature-appropriate environment for the battery cells.

[0061] The present invention provides an electrical device that uses a battery device as a power source. The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0062] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0063] Please refer to Figure 1 , Figure 1 A schematic structural diagram of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000. The battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000. For example, the battery device 100 may serve as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and operating power requirements of the vehicle 1000 during driving.

[0064] In some embodiments of the present application, the battery device 100 can serve not only as an operating power source for the vehicle 1000 , but also as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0065] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery device 100 provided in some embodiments of the present application. The battery device 100 includes a housing 10 and battery cells 20, with the battery cells 20 housed within the housing 10. The housing 10 provides space for the battery cells 20 and can have various structures. The shape of the housing 10 can be, but is not limited to, a cylinder, a rectangular parallelepiped, or the like.

[0066] In the battery device 100, there may be multiple battery cells 20, which may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery unit 20 may be housed within the housing 10. Alternatively, the battery device 100 may comprise multiple battery cells 20 connected in series, in parallel, or in a hybrid connection to form a battery module, which is then further connected in series, in parallel, or in a hybrid connection to form a single unit and housed within the housing 10. The battery device 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0067] Each battery cell 20 may be a secondary battery or a primary battery, and may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0068] Please refer to Figure 3 , Figure 3 The following is a schematic diagram of the decomposition structure of a battery cell 20 provided in some embodiments of the present application. A battery cell 20 is the smallest unit that makes up a battery. Figure 3 The battery cell 20 includes an end cover 21, a shell 22, a battery cell assembly 23 and other functional components.

[0069] The end cap 21 is a component that covers the opening of the housing 22 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end cap 21 can be adapted to the shape of the housing 22 to fit the housing 22. The end cap 21 can be made of a material with a certain degree of hardness and strength (such as an aluminum alloy). This prevents deformation of the end cap 21 during compression and collision, providing the battery cell 20 with greater structural strength and improved safety. The end cap 21 can be provided with functional components such as electrode terminals 21a. The electrode terminals 21a can be used to electrically connect to the battery cell assembly 23 to transmit or receive electrical energy from the battery cell 20. In some embodiments, the end cap 21 can also be provided with a pressure relief mechanism to release internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The end cap 21 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic, and this is not particularly limited in the present embodiments. In some embodiments, an insulating member may be provided inside the end cap 21 to isolate the electrical connection components in the housing 22 from the end cap 21 to reduce the risk of short circuit. For example, the insulating member may be made of plastic, rubber, or the like.

[0070] The housing 22 is a component that cooperates with the end cap 21 to form the internal environment of the battery cell 20. This internal environment can be used to accommodate the battery cell assembly 23, electrolyte, and other components. The housing 22 and end cap 21 can be separate components. An opening can be provided in the housing 22, and the end cap 21 is placed over the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 21 and housing 22 can be integrated. Specifically, the end cap 21 and housing 22 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 22 needs to be enclosed, the end cap 21 is placed over the housing 22. The housing 22 can have a variety of shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the housing 22 can be determined based on the specific shape and size of the battery cell assembly 23. The housing 22 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any specific limitations on this.

[0071] The battery cell assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. One or more battery cell assemblies 23 may be contained in the shell 22. The battery cell assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active substances constitute the main body of the battery cell assembly, and the parts of the positive and negative electrode sheets without active substances each constitute a tab. The positive and negative electrode tabs may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive electrode active substance and the negative electrode active substance react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0072] like Figure 4 and Figure 5 As shown, some embodiments of the present application provide a battery device 100, which includes a box body 10 and a battery cell 200. The box body 10 includes a wall body 11, and the wall body 11 together encloses a accommodating cavity, and the battery cell 20 is accommodated in the accommodating cavity; wherein, at least a portion of the wall body 11 is provided with a filling cavity (not shown in the figure), and the filling cavity is filled with an insulation structure 12.

[0073] For example, the box body 10 is a hexahedron, and the filling cavity can be provided within each of the six walls 11 corresponding to the six faces, or only within the bottom wall 11. It is understood that the filling cavity can also be provided within other parts of the wall 11, and the wall 11 where the filling cavity is provided can be determined based on actual conditions. The shape of the filling cavity can be, but is not limited to, spherical or elongated.

[0074] The insulation structure 12 can completely fill the filling cavity or only partially fill the filling cavity. The insulation structure 12 can be installed in the filling cavity by plugging, mortising, or other methods. If either the insulation structure 12 or the wall 11 of the box 10 is damaged, the insulation structure 12 can be removed and used with the wall 11 of the other box 10 to reduce the maintenance cost of the battery device 100.

[0075] When the battery device 100 is used at high altitudes or high latitudes, cold air from the outside enters the housing 10 and performs heat exchange, thereby lowering the temperature within the housing 10. However, if the ambient temperature of the battery cells 20 is too low, the chemical reaction rate within the battery cells 20 will slow down, resulting in a decrease in the capacity of the battery cells 20 and shortening the service life of the battery cells 20.

[0076] Assume that battery cells 20 are installed within the aforementioned housing 10, and the battery pack serves as the driving energy source for vehicle 1000. When vehicle 1000 equipped with this housing 10 is driven at high altitude, the heat generated by the battery cells 20 will permeate the housing 10. Because the insulation structure 12 is provided within the wall 11 of the housing 10, it forms a barrier layer. This barrier layer minimizes the entry of cold air from the outside into the housing 10 and facilitates heat exchange.

[0077] Compared to a method without a vacuum chamber in the wall 11, the above solution can increase the internal temperature of the box 10 by 5°C to 10°C. Therefore, this solution can minimize the loss of heat within the box 10, keep the box 10 warm, and thus provide a temperature-appropriate environment for the battery cells 20.

[0078] Similarly, when the box 10 is used in a higher temperature environment, the thermal insulation structure 12 provided in the wall 11 of the box 10 can also prevent external heat from entering the box 10 to provide insulation, thereby providing a temperature-suitable environment for the battery cells 20.

[0079] In summary, the insulation structure 12 provided in the wall 11 of the box body 10 can prevent the cold air from the outside from entering the box body 10 and perform heat exchange, so that the heat in the box body 10 is not lost as much as possible, and the box body 10 is insulated, thereby providing a temperature-suitable environment for the battery cell 20.

[0080] like Figure 6 As shown, in some embodiments, a vacuum chamber is provided inside the thermal insulation structure 12 .

[0081] During actual use, the vacuum cavity in the thermal insulation structure 12 can form a barrier layer to prevent external hot air or cold air from entering the box body 10 for heat exchange, so as to maintain the internal temperature of the box body 10.

[0082] Such an arrangement simplifies the structure of the thermal insulation structure 12 and reduces the difficulty of processing the thermal insulation structure 12 .

[0083] See also Figure 7 In some embodiments, the thermal insulation structure 12 includes a plurality of thermal insulation units 121 , all of which are embedded in the filling cavity, and a vacuum cavity is provided inside each thermal insulation unit 121 .

[0084] It can be understood that a plurality of heat preservation units 121 can be arranged at intervals in the filling cavity, and the spacing between two adjacent heat preservation units 121 can be equal or unequal. The spacing between two adjacent heat preservation units 121 can be flexibly adjusted according to actual conditions.

[0085] The above arrangement can flexibly arrange the heat preservation unit 121 without affecting the supporting effect of the wall body 11 itself, thereby improving the heat insulation effect of the wall body 11.

[0086] Please continue reading Figure 7 Specifically, in some embodiments, the structure of the heat preservation unit 121 is constructed as a spherical structure.

[0087] This arrangement can increase the volume of the vacuum chamber within the insulation unit 121 while minimizing the volume of the insulation unit 121, thereby improving the thermal insulation capacity of the insulation structure 12. Furthermore, the spherical structure facilitates installation, reducing the probability of interference and wear with other components during assembly.

[0088] More specifically, the heat preservation unit 121 includes a spherical core and a spherical shell. The spherical shell is wrapped around the spherical core. The spherical core is made of foam material, and the interior is enclosed to form a vacuum cavity.

[0089] For example, the core can be made of basalt fiber or metal material, and the shell can be made of rubber, gas silicon, glass fiber or metal material.

[0090] During core processing, open-cell foaming technology can be used to create a microporous foam structure on the core surface. This microporous foam structure allows air and moisture to pass through easily, providing good breathability and reducing the possibility of significant collapse inside the core due to vacuuming.

[0091] When preparing the spherical shell, four-fifths of the shell is pre-sealed with acrylic, epoxy, or polyurethane. The entire insulation unit 121 is then placed in a vacuum chamber. After evacuation, the remaining one-fifth is sealed, and the shell is finally cured at high temperature. The shell seals the core, reducing the chance of vacuum leaking from the core and maintaining the vacuum level within the core.

[0092] In this way, the heat preservation unit 121 is provided as a core and a shell, and the materials of the core and the shell are respectively limited, so that the shape of the heat preservation unit 121 is limited while the inside of the core is vacuumized, and the vacuum cavity of the heat preservation unit 121 is ensured not to collapse.

[0093] Further, the shell is configured as a multi-layer structure.

[0094] For example, the shell can be a two-layer structure, a three-layer structure, or a structure of more than three layers along the thickness direction of the shell. The materials required for preparing each layer can be different, the functions of each layer are enriched, and the environment applicable to the shell is widened.

[0095] In some embodiments, the shell includes a puncture-resistant layer, an aluminum layer, and a sealing layer arranged in layers along the thickness direction of the shell.

[0096] The puncture-resistant layer can be prepared from a material with good wear resistance and the like. The sealing layer can be prepared from a material such as polyethylene.

[0097] For example, the thickness of the puncture-resistant layer is 25 μm, and the puncture-resistant layer functions to resist friction and puncture. The aluminum layer includes a 12 μm thick aluminum-coated PET layer and a 7 μm thick aluminum foil layer. The aluminum-coated PET layer mainly functions to insulate water vapor. The aluminum foil layer mainly functions to insulate water vapor and maintain the degree of vacuum. The sealing layer is prepared from polyethylene and has a thickness of 50 μm. The sealing layer can be fused at high temperatures to function as a seal.

[0098] In this way, the functions of the shell are enriched, and the service life of the shell is prolonged.

[0099] Specifically, in some embodiments, the puncture-resistant layer is configured as a nylon member. In this way, the difficulty of obtaining the puncture-resistant member is reduced, and the puncture-resistant layer is easy to prepare.

[0100] It should be noted that the layer structure in the shell can be adjusted according to actual conditions.

[0101] In some examples, the shell can only include a puncture-resistant layer prepared from nylon, a 7 μm thick aluminum foil layer, and a sealing layer prepared from polyethylene.

[0102] In other examples, the shell can include a puncture-resistant layer prepared from nylon, an aluminum-coated PET layer, a high-barrier layer, and a sealing layer prepared from polyethylene. The high-barrier layer is prepared from a high-barrier material such as ethylene-vinyl alcohol copolymer.

[0103] In yet other examples, the shell can include a puncture-resistant layer prepared from nylon, a 12 μm thick aluminum-coated PET layer, a 7 μm thick aluminum foil layer, a sealing layer prepared from polyethylene, a puncture-resistant layer prepared from nylon, an aluminum-coated PET layer, a high-barrier layer, and a sealing layer prepared from polyethylene. In yet other examples, the shell can include a puncture-resistant layer prepared from nylon, a 12 μm thick aluminum-coated PET layer, a 7 μm thick aluminum foil layer, a sealing layer prepared from polyethylene, a puncture-resistant layer prepared from nylon, an aluminum-coated PET layer, a high-barrier layer, and a sealing layer prepared from polyethylene.

[0104] The above arrangement improves the flexibility of the number of layers constructed in the spherical shell, enriches the functions of the spherical shell, and broadens the range of materials for preparing the spherical shell.

[0105] In some embodiments, the spherical shells are heat sealed or welded together.

[0106] Such an arrangement can improve the connection stability of the membrane seal inside the spherical shell and reduce the probability of cracking at the seal of the membrane layer.

[0107] like Figure 7 As shown, in some embodiments, the thermal insulation structure 12 includes a mounting member 122 , and the mounting member 122 is wrapped around the outside of all the thermal insulation units 121 .

[0108] For example, the insulation structure 12 may include five insulation units 121 , and all insulation units 121 are arranged along the first direction X. When the mounting member 122 is wrapped around the insulation unit 121 , a sealed vacuum state may be formed between the mounting member 122 and the insulation unit 121 .

[0109] In this way, the mounting member 122 can prevent external components from directly contacting the insulation unit 121, reduce the risk of external components directly piercing the insulation unit 121, and protect the insulation unit 121. Secondly, even if the insulation unit 121 is damaged, the space within the mounting member 122 for assembling the insulation unit 121 is still in a vacuum state, which does not affect the use of the insulation structure 12. In addition, after all the insulation units 121 are wrapped with the mounting member 122, they can be installed together in the wall 11. Compared with installing individual insulation units 121 in the wall 11 one by one, the steps of installing the insulation structure 12 in the wall 11 are simplified, modular installation is achieved, and the time required to install the insulation structure 12 in the wall 11 is shortened.

[0110] In some embodiments, the structure of the mounting member 122 is configured as a thin film.

[0111] For example, the film can be made of aluminum composite film, nylon, etc., so as to have certain puncture resistance and wear resistance, and high and low temperature tolerance.

[0112] Because the film itself is thin and flexible, it can be deformed according to the shape of the insulation structure 12, thereby completely fitting the outer wall of the insulation structure 12. Furthermore, the thickness of the insulation structure 12 will not be significantly increased, so that the insulation structure 12 can be installed in the thinner wall 11, and the weight of the insulation structure 12 can be reduced, thereby achieving lightweighting.

[0113] Furthermore, in some embodiments, the mounting member 122 includes a first portion and a second portion, and the first portion and the second portion are sealed and connected to each other and together wrap the thermal insulation unit 121 .

[0114] It is understood that in some examples, the structure of the first portion and the structure of the second portion are the same. In some examples, the structure of the first portion and the structure of the second portion are different. When installing the thermal insulation unit 121, all thermal insulation units 121 are placed on the first portion, and then the second portion and the first portion are covered together to cover all thermal insulation units 121, which reduces the difficulty of installing the thermal insulation unit 121.

[0115] Furthermore, along the thickness direction of the mounting member 122 , both the first portion and the second portion are constructed as a multi-layer structure.

[0116] For example, the first part and the second part can be three-layered or four-layered. The materials used to make the first part and the second part can be different, which can enrich the functions of the first part and the second part, thereby broadening the applicable environment of the mounting member 122.

[0117] It should be noted that, in some examples, the spherical shell of the battery device 100 and the mounting member 122 are both constructed into a multi-layer structure. In other examples, the spherical shell is constructed into a multi-layer structure, but the mounting member 122 is a single-layer structure.

[0118] See Figure 6 and Figure 8 In some embodiments, a plurality of heat-insulating structures 12 are stacked inside the wall body 11 along the wall thickness direction of the wall body 11 .

[0119] In other words, a single thermal insulation structure 12 is regarded as a thermal insulation layer. Along the thickness direction of the wall body 11, two, three or more thermal insulation layers can be stacked in the wall body 11.

[0120] In this way, by stacking a plurality of thermal insulation structures 12 in the wall 11 , the thermal insulation effect of the box body 10 can be further improved.

[0121] In some embodiments, in a direction perpendicular to the wall 11 , the orthographic projection of the thermal insulation structure 12 on the wall 11 coincides with the area where the battery cell 20 is located.

[0122] For example, the orthographic projection of the insulation structure 12 on the wall 11 is a rectangle, which coincides with the area where the battery cell 20 is located. In this way, the insulation structure 12 can be evenly distributed in various parts of the wall 11, so that the thermal insulation capacity of each part of the wall 11 is relatively consistent.

[0123] Some embodiments of the present application further provide an electrical device, which includes the battery device 100 in the above embodiment.

[0124] When the battery device 100 is used in a low-temperature environment, the insulation structure 12 provided in the wall 11 of the box 10 can prevent the outside cold air from entering the box 10 and perform heat exchange, so that the heat in the box 10 is not lost as much as possible, and the box 10 is insulated, thereby providing a temperature-suitable environment for the battery cells 20.

[0125] In one embodiment, a thermal insulation structure 12 is provided within the wall 11 of the housing 10 of the battery device 100. The thermal insulation structure 12 includes a mounting member 122 and multiple thermal insulation units 121. All thermal insulation units 121 are distributed along a first direction X. The mounting member 122 includes a first layer and a second layer, which together cover all thermal insulation units 121. The thermal insulation units 121 include a spherical core and a spherical shell. The spherical shell wraps around the spherical core, and the interior of the spherical core encloses a vacuum chamber.

[0126] When the battery device 100 is used in a low-temperature environment, the insulation structure 12 provided in the wall 11 of the box 10 can prevent the outside cold air from entering the box 10 and perform heat exchange, so that the heat in the box 10 is not lost as much as possible, and the box 10 is insulated, thereby providing a temperature-suitable environment for the battery cells 20.

[0127] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0128] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A battery device, characterized in that: include The box body includes a wall body, and the wall body encloses and forms a receiving cavity; A battery cell is accommodated in the accommodation cavity; Wherein, at least a portion of the wall body is provided with a filling cavity, and the filling cavity is filled with a heat-insulating structure.

2. The battery device according to claim 1, wherein: A vacuum cavity is provided inside the heat-insulating structure.

3. The battery device according to claim 2, characterized in that The heat preservation structure includes a plurality of heat preservation units, all of which are embedded in the filling cavity, and the vacuum cavity is provided inside each of the heat preservation units.

4. The battery device according to claim 3, characterized in that The structure of the heat preservation unit is constructed as a spherical structure.

5. The battery device according to claim 4, characterized in that The heat preservation unit includes a spherical core and a spherical shell. The spherical shell is wrapped around the spherical core. The spherical core is made of foam material and the interior is enclosed to form the vacuum cavity.

6. The battery device according to claim 5, characterized in that The spherical shell is constructed into a multi-layer structure.

7. The battery device according to claim 6, characterized in that Along the thickness direction of the spherical shell, the spherical shell includes a stacked anti-puncture layer, an aluminum layer and a sealing layer.

8. The battery device according to claim 7, characterized in that The puncture-resistant layer is constructed as a nylon piece.

9. The battery device according to claim 7, wherein: The spherical shell is formed by heat sealing or welding.

10. The battery device according to claim 3, wherein: The heat-insulating structure includes a mounting member, and the mounting member is wrapped around the outside of all the heat-insulating units.

11. The battery device according to claim 10, characterized in that The structure of the mounting element is constructed as a thin film.

12. The battery device according to claim 11, wherein: The film includes a first portion and a second portion, wherein the first portion and the second portion are sealed and connected to each other and together wrap the heat preservation unit.

13. The battery device according to claim 12, characterized in that Along the thickness direction of the film, the first portion and the second portion are both constructed as a multi-layer structure.

14. The battery device according to any one of claims 2 to 13, characterized in that Along the wall thickness direction of the wall body, a plurality of the heat insulation structures are stacked in the wall body.

15. The battery device according to any one of claims 2 to 13, characterized in that In a direction perpendicular to the wall, the orthographic projection of the thermal insulation structure on the wall coincides with the area where the battery cells are located.

16. An electrical device, characterized in that: The battery device includes the battery device according to any one of claims 1 to 15.

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