Battery apparatus, electric apparatus and vehicle

Abstract

Disclosed in the present disclosure are a battery apparatus, an electric apparatus and a vehicle. The battery apparatus comprises a case, a heat exchange plate and battery cells, wherein the case is annularly arranged; the heat exchange plate is arranged below the case, and encloses an accommodating space together with the case; the battery cells are supported on the heat exchange plate and located in the accommodating space; the case comprises a case main body portion and mounting portions, the case main body portion being arranged adjacent to the battery cells and the heat exchange plate and configured to cooperate with the heat exchange plate to enclose the accommodating space, and the mounting portions being arranged on the outer side of the case main body portion and configured to fit with a vehicle body; and a heat insulation layer is provided at least at the position where the case main body portion engages with the heat exchange plate, the thermal conductivity of the heat insulation layer being lower than that of the case main body portion.

Description

Battery devices, electrical devices and vehicles

[0001] Cross-reference to related applications

[0002] This disclosure is based on and claims priority to Chinese Patent Application No. 202510181204.8, filed on February 18, 2025, entitled “Battery Device, Electrical Device and Vehicle”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of battery technology, and in particular to battery devices, electrical devices, and vehicles. Background Technology

[0004] The application of new energy batteries in daily life and industry is becoming increasingly widespread. For example, new energy vehicles equipped with batteries are already widely used, and batteries are also increasingly being applied in energy storage. In new energy vehicles equipped with batteries, the batteries can provide all or part of the power.

[0005] Existing battery packs exchange heat with individual battery cells through a liquid-cooled structure with circulating coolant to control and manage the temperature of the battery pack. The thermal management capability of the battery pack is related to its lifespan and charge / discharge capacity. Therefore, improving the thermal management capability of battery packs is one of the research topics that the industry needs to study. Summary of the Invention

[0006] To address the aforementioned technical problems, this disclosure provides a battery device, electrical device, and vehicle with better thermal management capabilities.

[0007] This disclosure is achieved through the following technical solution.

[0008] The first aspect of this disclosure provides a battery device, including a housing, a heat exchange plate, and battery cells. The housing is arranged in a ring shape. The heat exchange plate is disposed below the housing, forming an accommodating space together with the housing. The battery cells are supported on the heat exchange plate and located within the accommodating space. The housing includes a main body and a mounting portion. The main body is disposed adjacent to the battery cells and the heat exchange plate, and is used to cooperate with the heat exchange plate to form the accommodating space. The mounting portion is disposed on the outside of the main body and is used to cooperate with the vehicle body. A heat insulation layer is provided between the main body and the heat exchange plate, and the thermal conductivity of the heat insulation layer is lower than that of the main body.

[0009] In this embodiment, the heat exchange plate and the main body of the battery pack are arranged adjacent to each other, and the mounting part is arranged on the outside of the main body of the battery pack. The heat or cold energy transfer path of the heat exchange plate includes passing from the heat exchange plate through the main body of the battery pack and the mounting part toward the vehicle body. In this embodiment, a heat insulation layer is provided between the main body of the battery pack and at least the position where it cooperates with the heat exchange plate. The thermal conductivity of the heat insulation layer is lower than that of the main body of the battery pack. Therefore, the heat insulation layer is located in the path of energy transfer from the heat exchange plate to the vehicle body, which hinders the energy transfer and reduces the probability of cold or hot energy from the heat exchange plate being transferred to the main body of the battery pack. This reduces energy dissipation, improves energy utilization, improves temperature control efficiency, and further improves the thermal management capability of the battery device.

[0010] In addition, the heat exchange plate is located at the bottom of the housing, that is, the heat exchange plate is located below the main body of the housing, and the main body of the housing and the heat exchange plate work together to form an accommodating space. Therefore, the heat exchange plate also serves as the bottom plate of the accommodating space, reducing the space occupied by the heat exchange plate, thereby increasing the space for accommodating individual battery cells. Furthermore, it also compresses the overall height of the battery device, saving space in the height direction of the battery device and improving the volumetric energy density of the battery device.

[0011] In some embodiments, the main body of the box mates with the mounting part, and a heat insulation layer is provided between the mating positions of the main body of the box and the mounting part.

[0012] A heat insulation layer is provided between the main body of the battery box and the mounting part. This heat insulation layer is also located in the path of energy transfer from the heat exchange plate to the vehicle body, which hinders the energy transfer and reduces the probability of energy transfer from the main body of the battery box to the mounting part. This further reduces energy dissipation, improves energy utilization, improves temperature control efficiency, and thus improves the thermal management capability of the battery device.

[0013] In some embodiments, a heat insulation layer is provided on the outer surface of the main body of the box facing away from the mounting portion; and / or, a heat insulation layer is provided on the outer surface of the main body of the box facing away from the heat exchange plate.

[0014] This configuration further reduces the probability of energy transfer from the heat exchange plate to the outside of the housing, improves energy utilization, thereby improving temperature control efficiency and ultimately enhancing the thermal management capabilities of the battery device.

[0015] In some embodiments, the main body of the container includes aluminum profiles and / or steel profiles; and / or, the mounting portion includes aluminum profiles and / or steel profiles.

[0016] The main body of the enclosure is constructed from aluminum and / or steel profiles to meet structural strength requirements. The mounting section is also constructed from aluminum and / or steel profiles to meet structural strength requirements, thereby improving the installation strength of the battery pack and enhancing the fracture resistance of the side beams under impact, thus extending the battery pack's lifespan. Furthermore, the use of these materials in both the main body and mounting section results in high thermal conductivity, facilitating the conduction of heat or cold energy. Therefore, it is essential to cover the outer surface of the main body with a thermal insulation layer to reduce the likelihood of heat or cold energy transfer through the enclosure, improving energy utilization and temperature control efficiency, ultimately enhancing the battery pack's thermal management capabilities.

[0017] In some embodiments, the insulation layer includes a first resin matrix and a first fiber, the first resin matrix and the first fiber being connected together.

[0018] The composite material, comprising a first resin matrix and a first fiber, has a low thermal conductivity, thus providing insulation. Therefore, by placing an insulation layer on the outer surface of the main body of the enclosure, the probability of cold or heat energy being transferred outwards through the main body is reduced. Furthermore, the inclusion of the first fiber gives the insulation layer high strength and modulus, thereby reducing the likelihood of insulation layer damage and improving its insulation performance.

[0019] In some embodiments, the first fiber is a first continuous fiber, and the insulation layer includes multiple continuous fiber braided layers arranged sequentially from the inside to the outside. The continuous fiber braided layers are woven from multiple first continuous fibers, and at least a portion of the multiple first continuous fibers are spirally arranged around the circumferential direction of the main body of the box.

[0020] The insulation layer uses continuous fibers, that is, it uses continuous fiber composite materials, which improves the strength of the insulation layer. In addition, at least a portion of the multiple first continuous fibers are spirally wound, thus making the insulation layer continuous in the circumferential direction, improving the circumferential strength of the insulation layer, thereby reducing the probability of insulation layer damage and improving the insulation effect of the insulation layer.

[0021] In some embodiments, the main body of the box includes a plurality of side beams connected end to end in sequence, and the insulation layer is woven and pultruded around the outer periphery of the side beams using the side beams as core rods.

[0022] In this way, the insulation layer made by the woven pultrusion process can be firmly fixed to the outer periphery of the side beam, improving the overall strength of the main body of the box. This not only better performs the insulation effect, but also reduces the probability of damage to the main body of the box and the probability of damage to individual battery cells.

[0023] In some embodiments, the material of the first resin matrix is ​​a thermosetting resin or a thermoplastic resin.

[0024] In some embodiments, the first fiber is a discontinuous fiber, and the first resin matrix is ​​impregnated in the discontinuous fiber.

[0025] The insulation layer is made of fiber-reinforced plastic, which has high strength, reducing the chance of insulation damage and thus improving its insulation effect. Furthermore, the material design of the insulation layer reduces the likelihood of cold or heat energy being transferred outwards through the side beams, thereby improving the thermal management capability of the battery device.

[0026] In some embodiments, the main body of the box includes a plurality of side beams connected end to end in sequence, and the insulation layer and the side beams are integrally extruded; or, the insulation layer is injection molded on the outer periphery of the side beams.

[0027] Thus, the above molding method ensures a high connection strength between the insulation layer and the side beam, thereby better utilizing the insulation effect of the insulation layer. In addition, it also improves the overall strength of the main body of the box, thereby reducing the probability of damage to the main body of the box and consequently reducing the probability of damage to individual battery cells.

[0028] In some embodiments, the material of the first resin matrix is ​​a thermoplastic resin.

[0029] This allows the insulation layer to be extruded or injection molded, which helps improve the insulation effect of the insulation layer and reduce the chance of damage to the edge beam.

[0030] In some embodiments, the first fiber includes one or more combinations of organic fibers and inorganic fibers.

[0031] In some embodiments, the mounting portion is connected to the main body of the box by a first fastener.

[0032] In this way, the connection between the mounting part and the main body of the box is achieved by the first fastener, so that part of the heat insulation layer is blocked between the main body of the box and the mounting part, thereby reducing the probability of cold or hot energy in the battery device being transferred to the mounting part through the main body of the box, improving the energy utilization rate, thereby improving the efficiency of temperature control, and thus improving the thermal management capability of the battery device.

[0033] In some embodiments, the heat exchange plate includes a first plate and a second plate, at least a portion of the first plate and the second plate are stacked together and form a flow channel for the flow of heat exchange medium between them, the first plate and the battery cell are disposed close to each other, and a portion of the second plate is located on the side of the first plate opposite to the receiving space, wherein the thermal conductivity of the first plate is higher than that of the second plate.

[0034] Because the first plate is close to the battery cell and has a high thermal conductivity, it can efficiently exchange heat with the battery cell, effectively managing the temperature of the battery cell. On the other hand, because the second plate has a low thermal conductivity, its heat exchange performance with components on the side away from the first plate is poor, reducing the waste of thermal or cold energy in the heat exchange medium. This improves the utilization rate of thermal or cold energy in the heat exchange medium, thereby improving the efficiency of temperature control of the battery cell and ultimately enhancing the thermal management capability of the battery device.

[0035] In some embodiments, the periphery of the second plate is formed with a flange that bends toward the side where the first plate is located, and the flange covers the outer peripheral surface of the first plate.

[0036] This design reduces the transfer of heat or cold energy of the heat exchange medium along the first plate to the surrounding area, thus reducing the waste of heat or cold energy of the heat exchange medium and improving the utilization rate of heat or cold energy of the heat exchange medium. This, in turn, improves the efficiency of temperature control of individual battery cells and enhances the thermal management capability of the battery device.

[0037] In some embodiments, the flange abuts against the insulation layer.

[0038] In this way, the edges of the first plate are covered by flanges and heat insulation layers, which block the heat or cold energy transmitted to the first plate, reducing the probability of heat or cold energy being transferred outward through the first plate. This increases the probability of heat or cold energy being transferred towards the battery cells through the first plate, thereby improving energy utilization.

[0039] In some embodiments, the second plate is a one-piece molded structure.

[0040] Thus, the second plate has high structural strength, the bottom plate has strong resistance to cracking, and the protection performance of the battery cells is improved.

[0041] In some embodiments, the second plate comprises a continuous fiber composite material.

[0042] This results in a lower thermal conductivity coefficient for the second plate, reducing energy loss. Furthermore, the second plate has high structural strength, making the base plate less prone to damage and improving the protection of the battery cells. In addition, the second plate is lightweight, which is beneficial for the weight reduction of the battery device.

[0043] In some embodiments, the second plate includes multiple layers of continuous fiber composite material, each layer of which includes a second continuous fiber and a second resin matrix, the second resin matrix being connected to the second continuous fiber.

[0044] The composite material formed by utilizing the second continuous fiber and the second resin matrix has the characteristics of high strength, high rigidity and high toughness, which helps to improve the structural strength and structural stiffness of the second plate.

[0045] In some embodiments, the second resin matrix is ​​a thermoplastic resin, and multiple layers of continuous fiber composite material are laminated to form a continuous fiber composite board, which is then molded to form a second board.

[0046] The second resin matrix is ​​made of thermoplastic resin; that is, the second board is made of a continuous fiber-reinforced thermoplastic composite material. Multiple layers of continuous fiber composite material are first laminated to form a continuous fiber composite board, which is then molded to form the second board. Using a molding process can more accurately ensure the shape and dimensional precision of the second board, thereby maximizing its mechanical properties and structural integrity.

[0047] In some embodiments, the second resin matrix is ​​a thermosetting resin, and multiple layers of continuous fiber composite material are laminated to form a prepreg sheet, and at least one layer of the prepreg sheet is molded to form a second plate.

[0048] The second resin matrix is ​​a thermosetting resin; that is, the second board is made of a continuous fiber-reinforced thermosetting composite material. Thus, the second board can be manufactured using a prepreg molding process. In this process, a prepreg sheet is first formed using multiple layers of continuous fiber composite material, and then at least one layer of the prepreg sheet is molded to form the second board. Using the prepreg molding process can more accurately ensure the shape and dimensional precision of the second board, thereby maximizing its mechanical properties and structural integrity.

[0049] In some embodiments, the second continuous fiber includes one or more combinations of organic fibers and inorganic fibers.

[0050] Organic fibers possess high strength, good elasticity, and flexibility. Inorganic fibers possess high strength and modulus. The use of one or more combinations of organic and inorganic fibers with resins can help improve the strength of single-layer continuous fiber composite layers.

[0051] In some embodiments, inorganic fibers include any one or any combination of glass fibers, carbon fibers, basalt fibers, aramid fibers, or boron fibers; and / or, organic fibers include any one or any combination of aromatic polyamide fibers and ultra-high molecular weight polyethylene fibers.

[0052] In some embodiments, the thermosetting resin includes epoxy resin, polyurethane; and / or, the thermoplastic resin includes polypropylene resin and / or polyamide resin.

[0053] In some embodiments, the second plate comprises thermoplastic.

[0054] Thermoplastic plastics can be gradually softened by heating, becoming malleable. They can be processed into second sheets through various molding methods such as injection molding, extrusion, and blow molding. The shape and dimensional accuracy of the second sheets can be accurately guaranteed, and they are also easy to recycle and reuse.

[0055] In some embodiments, the second plate is formed by injection molding or compression molding.

[0056] In some embodiments, the main body of the box includes a plurality of side beams connected end to end in sequence. Each side beam includes a beam body and two connecting portions respectively connected to the two ends of the beam body along its extension direction. At least a portion of the outer peripheral surface of each beam body is covered with a heat insulation layer. The connecting portions of two adjacent side beams are connected to form a corner. At least a portion of the outer surface of the corner is covered with a heat insulation layer. The heat insulation layer covering the same corner is an integrally formed structure.

[0057] The connecting part connects adjacent side beams. The outer surface of the corner formed by the connection of two connecting parts is covered with a heat insulation layer. The outer periphery of the main beam is also covered with a heat insulation layer, so that the area of ​​the outer periphery of the side beam covered by the heat insulation layer is large, which improves the heat insulation effect of the heat insulation layer, thereby improving the energy utilization rate, improving the temperature control efficiency, and thus improving the thermal management capability of the battery device.

[0058] In some embodiments, the close-to-each connection portions of two adjacent edge beams are welded together to form a weld, and the heat insulation layer covers the weld.

[0059] Since the weld formed by welding the connected parts is covered by the heat insulation layer covering the outer periphery of the connection, the sealing requirements of the weld are not high, and the overall sealing robustness can be improved.

[0060] In some embodiments, the main body of the box further includes a side beam connector, which includes a first part and a second part connected together, the first part and the second part being respectively inserted into the close connecting parts of two adjacent side beams.

[0061] In this way, the connection between adjacent side beams is achieved through the side beam connector. Moreover, the first and second parts of the side beam connector are respectively inserted into the close connection parts of two adjacent main beams, hiding the side beam connector in the two connected connection parts, reducing the space occupied by the side beam connector on the outside of the connection part, and facilitating the subsequent covering of the connection part with a heat insulation layer.

[0062] In some embodiments, the end faces of the connecting portions of two adjacent side beams that are close to each other are inclined end faces, and the inclined end faces form an acute angle with the extension direction of the side beams, and the inclined end faces of the connecting portions of two adjacent side beams that are close to each other fit together.

[0063] By fitting the inclined end faces of the two connecting parts together, the extending directions of the two adjacent body beams intersect, thereby forming a receiving groove for accommodating the battery cell by multiple connected side beams surrounding the outer periphery of the base plate. Furthermore, the fitting of the inclined end faces increases the contact area at the joint of the two adjacent body beams, improving the connection strength at the joint.

[0064] In some embodiments, the first part is bonded to the connecting part; and / or, the first part is connected to the connecting part by a second fastener; and / or, the second part is bonded to the connecting part; and / or, the second part is connected to the connecting part by a third fastener.

[0065] Thus, by adding adhesive or fastening connections on top of the insertion of the first or second part with the connecting part, the connection strength between the first or second part and the connecting part is increased, as is the connection strength between adjacent side beams, reducing the probability of frame damage and thus extending the service life of the battery device. Furthermore, the high connection strength between adjacent body beams helps reduce the probability of the insulation layer being damaged due to breakage at the connection points between the body beams, thereby further improving thermal management performance.

[0066] A second aspect of this disclosure provides an electrical device that includes a plurality of battery devices provided in the first aspect, the battery devices being used to store or provide electrical energy.

[0067] Since the power supply device includes the battery device provided in the first aspect, and the power supply device includes all the beneficial effects of the battery device, the battery device has high thermal management capability.

[0068] A third aspect of this disclosure provides a vehicle comprising: a body and a chassis, the body being located above the chassis; and a plurality of battery devices provided in the first aspect, the battery devices being used to provide electrical energy.

[0069] Because the vehicle includes the battery device provided in the first aspect, and the vehicle includes all the beneficial effects of the battery device, the vehicle has high battery thermal management capabilities.

[0070] In some embodiments, the vehicle body and chassis are detachably connected.

[0071] This design allows for the separation and decoupling of the body and chassis, enabling the body to be replaced as needed, shortening the development cycle and reducing costs. In other words, it also improves the integration of the chassis, making it compatible with a variety of vehicle models.

[0072] In some embodiments, the vehicle body and chassis together enclose the passenger compartment of the vehicle, and the battery box of the battery unit forms the floor of the passenger compartment.

[0073] By integrating the battery pack into the passenger compartment floor, additional supports and connectors can be reduced, helping to reduce vehicle weight and making more efficient use of the vehicle's interior space.

[0074] Invention Effects

[0075] This disclosure provides a battery device, an electrical device, and a vehicle with good thermal management capabilities. Attached Figure Description

[0076] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this disclosure. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0077] Figure 1 is a structural schematic diagram of a vehicle according to one or more embodiments;

[0078] Figure 2 is an exploded perspective view of a battery device according to one or more embodiments;

[0079] Figure 3 is a three-dimensional structural diagram of a battery cell according to one or more embodiments;

[0080] Figure 4 is a three-dimensional exploded view of a battery cell according to one or more embodiments;

[0081] Figure 5 is a three-dimensional structural diagram of the box according to one or more embodiments;

[0082] Figure 6 is a cross-sectional view of the housing according to one or more embodiments;

[0083] Figure 7 is an enlarged view of point A in Figure 6;

[0084] Figure 8 is an enlarged view of point B in Figure 6;

[0085] Figure 9 is a structural schematic diagram of the first state of two side beams during the assembly process according to one or more embodiments;

[0086] Figure 10 is a structural schematic diagram of the second state of the two side beams during the assembly process according to one or more embodiments;

[0087] Figure 11 is a structural schematic diagram of the third state of the two side beams during the assembly process according to one or more embodiments;

[0088] Figure 12 is a structural schematic diagram of the fourth state of the two side beams during the assembly process according to one or more embodiments;

[0089] Figure 13 is a structural schematic diagram of the fifth state of the two side beams during the assembly process according to one or more embodiments;

[0090] Figure 14 is a three-dimensional exploded view of a vehicle according to one or more embodiments.

[0091] Explanation of reference numerals in the attached drawings: 1000 Vehicle; 100 Battery unit; 200 Controller; 300 Motor; 1 Battery cell; 11 Housing; 111 End cap; 112 Housing; 12 Electrode assembly; 120 Tab; 13 Electrode terminal; 14 Pressure relief mechanism; 2 Battery box; 220 Flow channel; 21 Box cover; 22 Main box; 221 Heat exchange plate; 2211 First plate; 2212 Second plate; 2213 Flanged edge; 222 Box body; 2220 Body section; 2221 Side beam; 222a First side beam; 222b Second side beam; 2223 Insulation layer; 223 Mounting part; 224 First fastener; 225 Connecting part; 2251 Insertion groove; 226 Corner part; 228 Side beam connector; 2281 First part; 2282 Second part; 229 Inclined end face; 231 Second fastener; 232 Third fastener; 400 Body; 500 Chassis. Detailed Implementation

[0092] The embodiments of the technical solutions disclosed herein will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solutions disclosed herein and are therefore intended to limit the scope of protection of this disclosure.

[0093] 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 disclosure belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure; the terms “comprising” and “having”, and any variations thereof, in the specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0094] In the description of the embodiments of this disclosure, technical terms such as "first," "second," and "third" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary or secondary relationship of the indicated technical features. In the description of the embodiments of this disclosure, "a plurality of" means two or more, unless otherwise explicitly defined.

[0095] 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 disclosure. 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.

[0096] In the description of the embodiments of this disclosure, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0097] In the description of the embodiments of this disclosure, the technical terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated, or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this disclosure.

[0098] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0099] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0100] The following is a detailed description of this disclosure.

[0101] Currently, new energy batteries are being used more and more widely in daily life and industry. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.

[0102] During use, battery packs experience temperature increases, which can negatively impact both the pack itself and the surrounding environment. For example, excessively high temperatures accelerate the rate of chemical reactions within individual battery cells, leading to faster capacity decay, damage to the chemical structure and performance of individual cells, and ultimately shortening the battery pack's lifespan. Furthermore, excessively high temperatures limit the charge and discharge capabilities of individual battery cells, resulting in decreased battery pack performance. Moreover, excessively high temperatures can cause increased internal pressure, potentially triggering thermal runaway and explosions, posing serious safety threats to users and the surrounding environment. Therefore, it is crucial to incorporate heat exchange structures to control the battery pack's temperature within a suitable range.

[0103] The inventors of this disclosure have noted that some battery packs utilize liquid cooling plates located at the bottom of individual battery cells for temperature control. The liquid cooling plates are connected to the side beams of the battery pack that surround the individual battery cells. The outer side of the side beams is connected to a mounting part for connecting to the vehicle body. The side beams and mounting parts are usually made of aluminum, which has a high thermal conductivity. Therefore, the cold energy of the liquid cooling plates can easily be transferred to the vehicle body through the side beams and mounting parts, resulting in energy waste and reducing the efficiency of temperature control, which in turn affects the thermal management capability of the battery pack.

[0104] The inventors of this disclosure have discovered through research that by setting a heat insulation layer between the liquid cooling plate and the side beam at the joint position, the probability of energy transfer from the liquid cooling plate to the side beam can be reduced, thereby reducing the probability of energy transfer to the vehicle body through the side beam and the mounting part, reducing energy dissipation, thereby improving energy utilization efficiency, thereby improving temperature control efficiency, and thus improving the thermal management capability of the battery pack.

[0105] Based on this design concept, the inventors of this disclosure have designed a battery device, including a housing, a heat exchange plate, and battery cells. The housing is arranged in a ring shape. The heat exchange plate is located below the housing, forming an accommodating space together with the housing. The battery cells are supported by the heat exchange plate and located within the accommodating space. The housing includes a main body and a mounting part. The main body is located adjacent to the battery cells and the heat exchange plate, and is used to cooperate with the heat exchange plate to form the accommodating space. The mounting part is located on the outside of the main body and is used to cooperate with the vehicle body. A heat insulation layer is provided between the main body and the heat exchange plate, and the thermal conductivity of the heat insulation layer is lower than that of the main body.

[0106] In this design, the heat exchange plate and the main body of the battery pack are arranged adjacent to each other, and the mounting part is located on the outside of the main body of the battery pack. The energy transfer path of the heat exchange plate includes passing through the main body of the battery pack and the mounting part in sequence towards the vehicle body. In this design, a heat insulation layer is provided between the main body of the battery pack and the heat exchange plate at least at the position where they cooperate. The thermal conductivity of the heat insulation layer is lower than that of the main body of the battery pack. Therefore, the heat insulation layer is located in the path from the heat exchange plate to the vehicle body, which hinders the transfer of energy. This reduces the probability of cold or hot energy from the heat exchange plate being transferred to the main body of the battery pack, thereby reducing energy dissipation, improving energy utilization, improving temperature control efficiency, and ultimately improving the thermal management capability of the battery pack.

[0107] The battery apparatus mentioned in the embodiments of this disclosure may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0108] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0109] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0110] In some embodiments, the battery device may be a battery pack, which includes a battery case and one or more individual battery cells housed within the battery case.

[0111] As an example, a battery cell assembly can be a battery module, which can be housed in a battery case by fixing the battery module in the battery case.

[0112] As an example, battery cell assemblies can also be housed in a battery box by directly fixing multiple battery cells to the battery box.

[0113] The technical solutions described in the embodiments of this disclosure are applicable to various power devices that use battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0114] The technical solutions described in the embodiments of this disclosure are applicable to various energy storage devices that use battery devices, such as energy storage containers or energy storage cabinets.

[0115] In the following embodiments, for ease of explanation, a vehicle 1000 is used as an example of an electrical device according to an embodiment of this disclosure. The description is as follows, in conjunction with the accompanying drawings.

[0116] Figure 1 is a structural schematic diagram of a vehicle 1000 according to one or more embodiments.

[0117] Vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. As shown in Figure 1, a battery device 100 is installed inside vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of vehicle 1000. The battery device 100 can be used to power vehicle 1000; for example, it can serve as the operating power source for vehicle 1000. Vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery device 100 to supply power to the motor 300, for example, to meet the power needs of vehicle 1000 during starting, navigation, and driving.

[0118] In some embodiments of this disclosure, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0119] Figure 2 is an exploded perspective view of a battery device 100 according to one or more embodiments.

[0120] As shown in Figure 2, the battery device 100 includes a battery box 2 and at least one battery cell 1. The battery box 2 has a receiving space, and at least one battery cell 1 is received in the receiving space.

[0121] In some embodiments of this disclosure, the battery box 2 includes a main body box 22 and a box cover 21, with the box cover 21 covering the main body box 22, thereby forming an accommodating space between the main body box 22 and the box cover 21.

[0122] The main body box 22 can be a hollow structure with one end open, and the lid 21 can be a plate-like structure. The lid 21 covers the open side of the main body box 22 so that the lid 21 and the main body box 22 together define the receiving space. Alternatively, both the lid 21 and the main body box 22 can be hollow structures with one side open, and the open side of the lid 21 covers the open side of the main body box 22. Of course, the battery box 2 formed by the lid 21 and the main body box 22 can be of various shapes, such as a cylinder, a cuboid, etc.

[0123] In the battery device 100, there can be multiple battery cells 1, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 1 are connected in both series and parallel configurations. Multiple battery cells 1 can be directly connected in series, parallel, or in a mixed manner, and then the assembly of these multiple battery cells 1 is placed in the receiving space formed by the main body box 22 and the box cover 21. Alternatively, the battery device 100 can also consist of multiple battery cells 1 first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules connected in series, parallel, or in a mixed manner to form an assembly, which is then housed within the receiving space formed by the main body box 22 and the box cover 21. 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 1.

[0124] In this embodiment of the disclosure, the battery cell 1 can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0125] The battery cell 1 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this embodiment does not limit it.

[0126] As an example, the battery cell 1 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This disclosure does not impose any particular limitations.

[0127] Figure 3 is a three-dimensional structural diagram of a battery cell 1 according to one or more embodiments; Figure 4 is a three-dimensional exploded view of a battery cell 1 according to one or more embodiments.

[0128] A battery cell 1 refers to the smallest unit that makes up a battery. Referring to Figures 3 and 4, the battery cell 1 includes a housing 11, an electrode assembly 12, and other functional components. The housing 11 includes an end cap 111 and a shell 112. The shell 112 has an accommodating space and an opening. The electrode assembly 12 is disposed within the accommodating space, and the end cap 111 closes the opening of the shell 112.

[0129] End cap 111 refers to a component that covers the opening of housing 112 to isolate the internal environment of battery cell 1 from the external environment. Not limited to this, the shape of end cap 111 can be adapted to the shape of housing 112 to fit it. Optionally, end cap 111 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that end cap 111 is not easily deformed under pressure or impact, giving battery cell 1 higher structural strength and improved safety performance. Electrode terminals 13 are electrically connected to electrode assembly 12 for outputting or inputting electrical energy from battery cell 1.

[0130] In some embodiments of this disclosure, the end cap 111 may also be provided with a pressure relief mechanism 14 for releasing internal pressure when the internal pressure or temperature of the battery cell 1 reaches a threshold. The end cap 111 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this disclosure does not impose any special limitations on this. In some embodiments of this disclosure, an insulating component may also be provided on the inner side of the end cap 111. The insulating component can be used to isolate the electrical connection components within the housing 112 from the end cap 111 to reduce the risk of short circuits. For example, the insulating component may be plastic, rubber, etc.

[0131] The housing 112 is a component used to cooperate with the end cap 111 to form the internal environment of the battery cell 1. The formed internal environment can accommodate the electrode assembly 12, electrolyte, and other components. The housing 112 and the end cap 111 can be independent components. An opening can be provided on the housing 112, and the end cap 111 can be used to close the opening to form the internal environment of the battery cell 1. Alternatively, the end cap 111 and the housing 112 can be integrated. Specifically, the end cap 111 and the housing 112 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 112, the end cap 111 closes the housing 112. The housing 112 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 112 can be determined according to the specific shape and size of the electrode assembly 12. The material of the housing 112 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this disclosure does not impose any special limitations on this.

[0132] Electrode assembly 12 is the component in the battery cell 1 where the electrochemical reaction occurs. The housing 112 may contain one or more electrode assemblies 12. The electrode assembly 12 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main beam of the electrode assembly, while the portions of the positive and negative electrode sheets without active material each constitute a tab 120. The positive and negative tabs may be located together at one end of the main beam or at opposite ends of the main beam. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs 120 connect to the electrode terminals 13 to form a current loop.

[0133] Figure 5 is a perspective structural diagram of the housing according to one or more embodiments; Figure 6 is a cross-sectional view of the housing according to one or more embodiments; Figure 7 is an enlarged view of point A in Figure 6; Figure 8 is an enlarged view of point B in Figure 6; Figure 9 is a structural diagram of the two side beams in the first state during the assembly process according to one or more embodiments; Figure 10 is a structural diagram of the two side beams in the second state during the assembly process according to one or more embodiments; Figure 11 is a structural diagram of the two side beams in the third state during the assembly process according to one or more embodiments; Figure 12 is a structural diagram of the two side beams in the fourth state during the assembly process according to one or more embodiments; Figure 13 is a structural diagram of the two side beams in the fifth state during the assembly process according to one or more embodiments; Figure 14 is a perspective exploded view of the vehicle according to one or more embodiments.

[0134] The first aspect of this disclosure provides a battery device 100, as shown in Figures 5 to 7. The battery device 100 includes a housing 222, a heat exchange plate 221, and a battery cell 1. The housing 222 is arranged in a ring shape. The heat exchange plate 221 is disposed below the housing 222, forming an accommodating space together with the housing 222. The battery cell 1 is supported on the heat exchange plate 221 and located within the accommodating space. The housing 222 includes a main body 2220 and a mounting part 223. The main body 2220 is disposed adjacent to the battery cell 1 and the heat exchange plate 221, and is used to cooperate with the heat exchange plate 221 to form the accommodating space. The mounting part 223 is disposed on the outside of the main body 2220 and is used to cooperate with the vehicle body 400. A heat insulation layer 2223 is provided between the main body 2220 and at least the position where it cooperates with the heat exchange plate 221. The thermal conductivity of the heat insulation layer 2223 is lower than that of the main body 2220.

[0135] It should be noted that the main body 2220 is positioned adjacent to the battery cell 1 and the heat exchange plate 221, meaning that it is positioned closer to the battery cell 1 and the heat exchange plate 221 than the mounting part 223. The heat exchange plate 221 supports the battery cell 1, that is, the battery cell 1 is placed above the heat exchange plate 221. The main body 2220 and the heat exchange plate 221 cooperate to form an accommodating space, within which the battery cell 1 is located. The main body 2220 is positioned around the battery cell 1, the heat exchange plate 221 is positioned below the battery cell 1, and the mounting part 223 is positioned on the side of the main body 2220 facing away from the accommodating space. The main body 2220 is positioned around the battery cell 1, meaning it surrounds the battery cell 1. The main body 2220 can be, but is not limited to, a square frame structure, a circular ring structure, etc. The material of the main body 2220 can be, but is not limited to, copper, aluminum, copper-aluminum composite materials, stainless steel, etc. The insulation layer 2223 can be made of a material with a low thermal conductivity relative to the main body 2220, such as, but not limited to, ordinary plastics, fiber-reinforced plastic sheets, or continuous fiber-reinforced composite materials.

[0136] The heat exchange plate 221 is a plate with flow channels 220. The flow channels 220 are used for the flow of heat exchange medium. The heat exchange medium flowing in the flow channels 220 can cool down the battery cell 1 when its temperature rises, and can also heat up the battery cell 1 when its temperature falls. By controlling the temperature of the battery cell 1 within the flow channels 220, the heat exchange medium can keep the temperature of the battery cell 1 within a suitable temperature range, thereby improving the performance of the battery device 100 and extending its service life.

[0137] The heat exchange medium can be a liquid or a gas. Liquid heat exchange media can be polyol-based coolants such as ethylene glycol or glycerol water, or water-based coolants. Gas heat exchange media can be air, ammonia, nitrogen, hydrogen, carbon dioxide, or alcohol vapor.

[0138] A heat insulation layer 2223 is provided between the main body 2220 and the heat exchange plate 221 at least. That is, the surface of the main body 2220 facing the heat exchange plate 221 is provided with a heat insulation layer 2223, and the heat insulation layer 2223 covers at least the part of the main body 2220 that mates with the heat exchange plate 221.

[0139] For example, as shown in Figures 2 and 5, the main body box 22 includes a box body 222 and a heat exchange plate 221. The heat exchange plate 221 is located below the box body 222, and the two form a hollow structure with an opening at the top. The box cover 21 closes to the opening from above, forming a receiving space for accommodating the battery cell 1.

[0140] In this embodiment, the heat exchange plate 221 and the main body 2220 are disposed adjacent to each other, and the mounting part 223 is disposed on the outside of the main body 2220. The energy transfer path of the heat exchange plate 221 includes passing from the heat exchange plate 221 through the main body 2220 and the mounting part 223 toward the vehicle body 400. In this embodiment, a heat insulation layer 2223 is disposed between the main body 2220 and the heat exchange plate 221 at least at the position where it cooperates. The thermal conductivity of the heat insulation layer 2223 is lower than that of the main body 2220. Therefore, the heat insulation layer 2223 is disposed in the path of energy transfer from the heat exchange plate 221 to the vehicle body 400, which hinders the energy transfer and reduces the probability of cold or hot energy from the heat exchange plate 221 being transferred to the main body 2220. This reduces energy dissipation, improves energy utilization, improves temperature control efficiency, and enhances the thermal management capability of the battery device 100.

[0141] In addition, the heat exchange plate 221 is located below the housing 222, that is, the heat exchange plate 221 is located below the housing body 2220, and the housing body 2220 and the heat exchange plate 221 cooperate to form an accommodating space. Therefore, the heat exchange plate 221 also serves as the bottom plate of the battery box 2, reducing the space occupied by the heat exchange plate 221 in the internal accommodating space of the battery box 2, thereby increasing the space for accommodating the battery cell 1. Furthermore, it also compresses the overall height of the battery device 100, saves space in the height direction of the battery device 100, and improves the volumetric energy density of the battery device 100.

[0142] In some embodiments of this disclosure, as shown in Figures 5 and 7, the main body 2220 of the box cooperates with the mounting part 223, and a heat insulation layer 2223 is provided between the positions where the main body 2220 of the box and the mounting part 223 cooperate.

[0143] For example, the surface of the main body 2220 facing the mounting part 223 is provided with a heat insulation layer 2223, and the heat insulation layer 2223 covers at least the part of the main body 2220 that mates with the mounting part 223.

[0144] A heat insulation layer 2223 is provided between the housing body 2220 and the mounting part 223. The heat insulation layer 2223 is also located in the path of energy transfer from the heat exchange plate 221 to the vehicle body 400, which hinders the energy transfer and reduces the probability of energy transfer from the housing body 2220 to the mounting part 223. This further reduces energy dissipation, improves energy utilization, improves temperature control efficiency, and thus improves the thermal management capability of the battery device 100.

[0145] For example, as shown in Figures 5 and 7, the main body 2220 of the box includes a plurality of side beams 2221 connected end to end in sequence. The plurality of side beams 2221 include two opposing first side beams 222a. Each first side beam 222a has a mounting part 223 connected to the side facing away from the accommodating space. A heat insulation layer 2223 is provided between the first side beam 222a and its corresponding mounting part 223 at the position where they cooperate.

[0146] For example, the outer peripheral surface of the side beam 2221 of the first side beam 222a is covered with a heat insulation layer 2223. That is, the outer surface of the side beam 2221 of the first side beam 222a facing the receiving space and the outer surface facing away from the receiving space are covered with a heat insulation layer 2223, and the outer surface of the side beam 2221 of the first side beam 222a facing the heat exchange plate 221 and the outer surface facing away from the heat exchange plate 221 are covered with a heat insulation layer 2223.

[0147] In some embodiments of this disclosure, as shown in Figures 5 and 7, the mounting portion 223 and the main body portion 2220 are connected by a first fastener 224.

[0148] For example, the first fastener 224 can be, but is not limited to, a bolt, screw, rivet, etc.

[0149] For example, the outer surface of the rear-facing accommodating space of the first side beam 222a is covered with a heat insulation layer 2223, and the mounting part 223 is connected to the side beam 2221 of the first side beam 222a by a first fastener 224.

[0150] Thus, the first fastener 224 connects the mounting part 223 to the main body 2220, causing part of the heat insulation layer 2223 to block the connection between the main body 2220 and the mounting part 223. This reduces the probability of cold or hot energy in the battery device 100 being transferred to the mounting part 223 through the main body 2220, improving energy utilization and thus improving temperature control efficiency, thereby enhancing the thermal management capability of the battery device 100.

[0151] In some embodiments of this disclosure, as shown in Figures 5 and 7, the plurality of side beams 2221 include a plurality of second side beams 222b connected between two first side beams 222a. The outer peripheral surfaces of the second side beams 222b are all covered with a heat insulation layer 2223. That is, the outer surfaces of the second side beams 222b facing the receiving space and the outer surfaces facing away from the receiving space are covered with the heat insulation layer 2223, and the outer surfaces of the second side beams 222b facing the heat exchange plate 221 and the outer surfaces facing away from the heat exchange plate 221 are both covered with the heat insulation layer 2223.

[0152] In this way, the probability of energy from the heat exchange plate 221 being transferred outward through the second side beam 222b can be reduced, improving the energy utilization rate, thereby improving the efficiency of temperature control and thus improving the thermal management capability of the battery device 100.

[0153] In some embodiments of this disclosure, as shown in Figures 5 and 7, a heat insulation layer 2223 is provided on the outer surface of the main body 2220 facing away from the mounting portion 223; and / or, a heat insulation layer 2223 is provided on the outer surface of the main body 2220 facing away from the heat exchange plate 221.

[0154] For example, as shown in Figures 5 and 7, the main body 2220 of the box includes a plurality of side beams 2221 connected end to end in sequence, and each side beam 2221 has a heat insulation layer 2223 on its outer peripheral surface.

[0155] A heat insulation layer 2223 is provided on the outer surface of the main body 2220 facing away from the mounting part 223. That is, a heat insulation layer 2223 is provided on the outer surface of the main body 2220 facing the containing space, which can reduce the probability of cold or heat energy in the containing space being transferred outward through the main body 2220. A heat insulation layer 2223 is provided on the outer surface of the main body 2220 facing away from the heat exchange plate 221. That is, a heat insulation layer 2223 is provided on the outer surface of the main body 2220 facing the lid 21, which can reduce the probability of cold or heat energy being transferred outward through the main body 2220 and the lid 21.

[0156] This configuration further reduces the probability of energy from the heat exchange plate 221 being transferred to the outside of the housing 222, improves energy utilization, thereby improving the efficiency of temperature control and thus enhancing the thermal management capability of the battery device 100.

[0157] In some embodiments of this disclosure, as shown in FIG7, the main body 2220 of the box includes aluminum profiles and / or steel profiles; and / or, the mounting part 223 includes aluminum profiles and / or steel profiles.

[0158] The main body 2220 is made of aluminum and / or steel profiles to meet the structural strength requirements of the main body 2220. The mounting part 223 is made of aluminum and / or steel profiles to meet the structural strength requirements of the mounting part 223, thereby improving the installation strength of the battery device 100 and the fracture resistance of the side beam 2221 under impact, thereby improving the service life of the battery device 100.

[0159] Furthermore, the use of the aforementioned materials in the main body 2220 and the mounting part 223 results in a high thermal conductivity, making it easy to conduct heat or cold energy. Therefore, in this case, it is even more necessary to cover the outer peripheral surface of the main body 2220 with a heat insulation layer 2223 to reduce the probability of cold or heat energy being transferred outward through the main body 2220, improve the utilization rate of energy, thereby improving the efficiency of temperature control and thus improving the thermal management capability of the battery device 100.

[0160] In some embodiments of this disclosure, as shown in FIG7, the heat insulation layer 2223 includes a first resin matrix and a first fiber, the first resin matrix and the first fiber being connected together.

[0161] The first resin matrix is ​​a structure formed by resin curing, and the first fiber is a continuous or discontinuous fiber, with the first resin matrix impregnated in the first fiber. The discontinuous fiber can be a short fiber or a long fiber.

[0162] The composite material, including a first resin matrix and a first fiber, has a low thermal conductivity, thus providing insulation. Therefore, an insulation layer 2223 is provided on the outer surface of the main body 2220 to reduce the likelihood of cold or heat energy being transferred outwards through the main body 2220. Furthermore, the presence of the first fiber gives the insulation layer 2223 high strength and modulus, reducing the likelihood of damage and improving its insulation effect.

[0163] In some embodiments of this disclosure, the first fiber is a first continuous fiber, and the heat insulation layer 2223 includes multiple layers of continuous fiber braided layers arranged sequentially from the inside to the outside. The continuous fiber braided layer is woven from multiple first continuous fibers, and at least a portion of the multiple first continuous fibers are spirally arranged around the enclosure body 2220 in the surrounding direction.

[0164] For example, the main body 2220 of the box includes a plurality of side beams 2221 connected end to end in sequence, and at least a portion of the plurality of first continuous fibers of the heat insulation layer 2223 disposed on the outer surface of the side beams 2221 are spirally arranged around the extension direction of the side beams 2221.

[0165] The insulation layer 2223 uses continuous fibers, that is, the insulation layer 2223 uses a continuous fiber composite material, which improves the strength of the insulation layer 2223. In addition, at least a portion of the multiple first continuous fibers are spirally wound, so that the insulation layer 2223 has continuity in the circumferential direction, which improves the circumferential strength of the insulation layer 2223, thereby reducing the probability of the insulation layer 2223 being damaged, and thus improving the heat insulation effect of the insulation layer 2223.

[0166] In some embodiments of this disclosure, the main body 2220 includes a plurality of side beams 2221 connected end to end in sequence, and the heat insulation layer 2223 is woven and pultruded around the side beams 2221 with the side beams 2221 as the core rod.

[0167] The insulation layer 2223 is formed by a braiding pultrusion process. Before the braiding pultrusion operation, the side beam 2221 is installed as a mandrel in the braiding pultrusion equipment. The braiding pultrusion equipment braids the first continuous fiber on the outer periphery of the side beam 2221 and forms the insulation layer 2223 on the outer periphery of the side beam 2221 through the pultrusion process.

[0168] Thus, the heat insulation layer 2223, made by the woven pultrusion process, can be firmly fixed to the outer periphery of the side beam 2221, improving the overall strength of the main body 2220 of the box. This not only better enhances the heat insulation effect but also reduces the probability of damage to the main body 2220 of the box and the probability of damage to the battery cell 1.

[0169] In some embodiments of this disclosure, the material of the first resin matrix is ​​a thermosetting resin or a thermoplastic resin.

[0170] For example, the first resin matrix is ​​made of thermosetting resin. During the curing process, the thermosetting resin undergoes a cross-linking reaction to form a three-dimensional network structure. This gives the product high strength, rigidity, and dimensional stability, meeting the requirements for use of the insulation layer 2223. Moreover, it does not melt after curing and can maintain good performance even in high-temperature environments, making it less prone to deformation.

[0171] For example, the material of the first resin matrix is ​​a thermoplastic resin, which has the characteristic of being reprocessable and has significant advantages in terms of product recycling and secondary processing. Moreover, thermoplastic resins generally have good toughness, and the resulting heat insulation layer 2223 has high impact resistance.

[0172] In some embodiments of this disclosure, the first fiber is a discontinuous fiber, and the first resin matrix is ​​impregnated in the discontinuous fiber.

[0173] The insulation layer 2223 uses discontinuous fibers, which can be short or long fibers. In other words, the insulation layer 2223 uses fiber-reinforced plastic, resulting in high strength and reducing the likelihood of breakage, thus improving its insulation performance. Furthermore, the material selection of the insulation layer 2223 reduces the probability of cold or heat energy being transferred outwards through the side beam 2221, thereby improving the thermal management capability of the battery device 100.

[0174] In some embodiments of this disclosure, the main body 2220 includes a plurality of side beams 2221 connected end to end in sequence, and the heat insulation layer 2223 and the side beams 2221 are integrally extruded; or, the heat insulation layer 2223 is injection molded on the outer periphery of the side beams 2221.

[0175] For example, the side beam 2221 is made of aluminum profile, and the heat insulation layer 2223 and the side beam 2221 are formed by aluminum-plastic co-extrusion process.

[0176] For example, the insulation layer 2223 is formed by injection molding.

[0177] Thus, through the above molding method, the connection strength between the heat insulation layer 2223 and the side beam 2221 is high, which can better exert the heat insulation effect of the heat insulation layer 2223. In addition, it also improves the overall strength of the main body 2220 of the box, thereby reducing the probability of damage to the main body 2220 of the box, and thus reducing the probability of damage to the battery cell 1.

[0178] In some embodiments of this disclosure, the material of the first resin matrix is ​​a thermoplastic resin.

[0179] This allows the insulation layer 2223 to be extruded or injection molded, which helps to improve the insulation effect of the insulation layer 2223 and reduce the chance of damage to the side beam 2221.

[0180] In some embodiments of this disclosure, the first fiber includes one or more combinations of organic fibers and inorganic fibers.

[0181] In some embodiments of this disclosure, as shown in Figures 7 and 8, the heat exchange plate 221 includes a first plate 2211 and a second plate 2212. Parts of the first plate 2211 and the second plate 2212 are stacked and form a flow channel 220 between them. The first plate 2211 is disposed close to the battery cell 1. Parts of the second plate 2212 are located on the side of the first plate 2211 facing away from the receiving space. The thermal conductivity of the first plate 2211 is higher than that of the second plate 2212.

[0182] The first plate 2211 may be made of a material with a high thermal conductivity, such as, but not limited to, copper, aluminum, copper-aluminum composites, stainless steel, etc. The second plate 2212 may be made of a material with a lower thermal conductivity than the first plate 2211, such as, but not limited to, ordinary plastics, fiber-reinforced plastics, or continuous fiber-reinforced composites, etc.

[0183] The first plate 2211 and the battery cell 1 can be positioned close to each other, allowing for heat exchange through direct or indirect contact. Alternatively, the first plate 2211 and the battery cell 1 can be positioned close enough in space to exchange heat with each other, even though they are not in direct contact.

[0184] For example, one of the first plate 2211 and the second plate 2212 is provided with a groove extending along a curve or a straight line, and the other is a flat plate. The two plates are joined together to form a flow channel 220. Alternatively, both the first plate 2211 and the second plate 2212 are provided with grooves extending along a curve or a straight line. When the two plates are joined together, the grooves of the two plates are joined together to form a flow channel 220.

[0185] Because the first plate 2211 is close to the battery cell 1 and has a high thermal conductivity, it can efficiently exchange heat with the battery cell 1, effectively managing the temperature of the battery cell 1. Furthermore, because the second plate 2212 has a low thermal conductivity, its heat exchange performance with components on the side away from the first plate 2211 is poor, reducing the waste of thermal or cold energy in the heat exchange medium. This improves the utilization rate of thermal or cold energy in the heat exchange medium, thereby improving the efficiency of temperature control of the battery cell 1 and ultimately enhancing the thermal management capability of the battery device 100.

[0186] In some embodiments of this disclosure, as shown in FIG7, the periphery of the second plate 2212 is formed with a flange 2213 that bends toward the side where the first plate 2211 is located, and the flange 2213 covers the outer periphery of the first plate 2211.

[0187] It is understandable that the second plate 2212 includes a flange 2213, in other words, the flange 2213 is part of the second plate 2212. Therefore, the thermal conductivity of the flange 2213 is lower than that of the first plate 2211.

[0188] This configuration reduces the transfer of heat or cold energy of the heat exchange medium along the first plate 2211 to the surrounding area, reducing the waste of heat or cold energy of the heat exchange medium, thereby improving the utilization rate of heat or cold energy of the heat exchange medium, thus improving the efficiency of temperature control of the battery cell 1, and further improving the thermal management capability of the battery device 100.

[0189] In some embodiments of this disclosure, as shown in FIG7, the flange 2213 abuts against the heat insulation layer 2223.

[0190] It is understandable that the flange 2213 abuts against the insulation layer 2223 covering the outer surface of the heat exchange plate 221 of the side beam 2221.

[0191] In this way, the four edges of the first plate 2211 are covered by the flange 2213 and the heat insulation layer 2223, which blocks the heat or cold energy transferred to the first plate 2211, reducing the probability of heat or cold energy being transferred outward through the first plate 2211, thereby increasing the probability of heat or cold energy being transferred towards the battery cell 1 through the first plate 2211, and thus improving the energy utilization rate.

[0192] In some embodiments of this disclosure, as shown in FIG7, the second plate 2212 is an integrally formed structure.

[0193] It is understandable that the second plate 2212 is a one-piece molded structure, which means that the part of the second plate 2212 stacked on the back-facing accommodating space of the first plate 2211 and the flange 2213 are integrally molded.

[0194] Thus, the second plate 2212 has high structural strength, the heat exchange plate 221 has strong anti-crack ability, and the protection performance of the battery cell 1 is improved.

[0195] In some embodiments of this disclosure, as shown in FIG7, the second plate 2212 comprises a continuous fiber composite material.

[0196] This results in the second plate 2212 having a lower thermal conductivity coefficient, reducing energy loss. Furthermore, the second plate 2212 has high structural strength, making the heat exchange plate 221 less prone to damage and improving the protection of the battery cell 1. In addition, the second plate 2212 is lightweight, which is beneficial for the weight reduction of the battery device 100.

[0197] In some embodiments of this disclosure, as shown in FIG7, the second plate 2212 includes multiple layers of continuous fiber composite material, each layer of continuous fiber composite material including a second continuous fiber and a second resin matrix, the second resin matrix being connected to the second continuous fiber.

[0198] The composite material formed by utilizing the second continuous fiber and the second resin matrix has the characteristics of high strength, high rigidity and high toughness, which helps to improve the structural strength and structural stiffness of the second plate 2212.

[0199] In some embodiments of this disclosure, the second resin matrix is ​​a thermoplastic resin, and multiple layers of continuous fiber composite material are laminated to form a continuous fiber composite board, which is then molded to form a second board 2212.

[0200] The second resin matrix is ​​made of thermoplastic resin, that is, the second plate 2212 is made of continuous fiber reinforced thermoplastic composite material. The multi-layered continuous fiber composite material is first laminated to form a continuous fiber composite board, which is then molded to form the second plate 2212. Using a molding process can more accurately ensure the shape and dimensional precision of the second plate 2212, thereby ensuring the mechanical properties and structural integrity of the second plate 2212 as much as possible.

[0201] In some embodiments of this disclosure, the second resin matrix is ​​a thermosetting resin, and a prepreg sheet is formed by multilayered continuous fiber composite material layers, and at least one layer of the prepreg sheet is molded to form a second plate 2212.

[0202] The second resin matrix is ​​a thermosetting resin; that is, the second plate 2212 is made of a continuous fiber-reinforced thermosetting composite material. Thus, the second plate 2212 can be manufactured using a prepreg molding process. During manufacturing, a prepreg sheet is first formed using multiple layers of continuous fiber composite material, and then at least one layer of the prepreg sheet is molded to form the second plate 2212. Using the prepreg molding process can more accurately ensure the shape and dimensional precision of the second plate 2212, thereby maximizing its mechanical properties and structural integrity.

[0203] In some embodiments of this disclosure, the second continuous fiber includes one or more combinations of organic fibers and inorganic fibers.

[0204] Organic fibers possess high strength, good elasticity, and flexibility. Inorganic fibers possess high strength and modulus. The use of one or more combinations of organic and inorganic fibers with resins can help improve the strength of single-layer continuous fiber composite layers.

[0205] In some embodiments of this disclosure, the inorganic fibers include any one or any combination of glass fibers, carbon fibers, basalt fibers, aramid fibers, or boron fibers; and / or, the organic fibers include any one or any combination of aromatic polyamide fibers and ultra-high molecular weight polyethylene fibers.

[0206] In some embodiments of this disclosure, the thermosetting resin includes epoxy resin, polyurethane; and / or, the thermoplastic resin includes polypropylene resin and / or polyamide resin.

[0207] In some embodiments of this disclosure, the second plate 2212 comprises thermoplastic.

[0208] Thermoplastic plastics include polyethylene, polypropylene, polyvinyl chloride, polystyrene, polycarbonate, etc.

[0209] Thermoplastic plastics can be gradually softened by heating, becoming malleable. They can be processed into a second plate 2212 through various molding methods such as injection molding, extrusion, and blow molding. The shape and dimensional accuracy of the second plate 2212 can be accurately guaranteed, and it is also easy to recycle and reuse.

[0210] In some embodiments of this disclosure, the second plate 2212 is formed by injection molding or compression molding.

[0211] For example, the second plate 2212 is made of thermoplastic and is formed by injection molding or compression molding.

[0212] In some embodiments of this disclosure, as shown in Figures 9 to 13, the main body 2220 of the box includes a plurality of side beams 2221 connected end to end in sequence. Each side beam 2221 includes a beam body and two connecting portions 225 respectively connected to the two ends of the beam body along its extension direction. At least a portion of the outer peripheral surface of each beam body is covered with a heat insulation layer 2223. The connecting portions 225 of two adjacent side beams 2221 are connected to form a corner portion 226. At least a portion of the outer surface of the corner portion 226 is covered with a heat insulation layer 2223. The heat insulation layer covering the same corner portion is an integrally formed structure.

[0213] The two connecting parts 225 of the same side beam 2221 are the two ends of the side beam 2221 along its extension direction, and are both part of the side beam 2221. The connecting parts 225 are used to connect with the adjacent side beam 2221.

[0214] Since adjacent side beams 2221 are connected by their connecting parts 225, and the operation of connecting the connecting parts 225 is prone to damaging the heat insulation layer 2223, during the manufacturing stage of the side beams 2221, only the outer periphery of the main body of the beam is covered with the heat insulation layer 2223, while the outer periphery of the connecting parts 225 is not heat-insulated. After multiple side beams 2221 are connected, the heat insulation layer 2223 is formed on the outer surface of the corner 226 formed by the connection of adjacent connecting parts 225, so that the newly formed heat insulation layer 2223 is connected with the heat insulation layer 2223 covering the main body of the beam as one unit.

[0215] For example, a heat insulation layer 2223 is formed on the outer surface of the corner portion 226 by injection molding.

[0216] The connecting part 225 connects adjacent side beams 2221. The outer surface of the corner part 226 formed by the connection of the two connecting parts 225 is covered with a heat insulation layer 2223. The outer periphery of the main beam part is covered with a heat insulation layer 2223, so that the area of ​​the outer periphery of the side beam 2221 covered by the heat insulation layer 2223 is large, which improves the heat insulation effect of the heat insulation layer 2223, thereby improving the energy utilization rate, improving the temperature control efficiency, and thus improving the thermal management capability of the battery device 100.

[0217] In some embodiments of this disclosure, as shown in FIG9, the close-to-each-adjacent connection portions 225 of two adjacent side beams 2221 are welded together to form a weld, and the heat insulation layer 2223 covers the weld.

[0218] In this embodiment of the disclosure, since the weld formed by welding the connected parts 225 is covered by the heat insulation layer 2223 covering the outer peripheral surface of the connected parts 225, the sealing requirements of the weld are not high, and the overall sealing robustness can be improved.

[0219] In some embodiments of this disclosure, as shown in Figures 9 to 13, the main body 2220 of the box also includes a side beam connector 228. The side beam connector 228 includes a first part 2281 and a second part 2282 connected together. The first part 2281 and the second part 2282 are respectively inserted into the close connecting parts 225 of two adjacent side beams 2221.

[0220] It is understood that the end of the connecting portion 225 is formed with a insertion groove 2251, and the first portion 2281 or the second portion 2282 is inserted into the insertion groove 2251. For example, the side beam 2221 is an aluminum profile with an internal cavity, and the portion of the cavity corresponding to the connecting portion 225 is the insertion groove 2251.

[0221] For example, the side beam connector 228 can be, but is not limited to, a corner bracket.

[0222] Thus, the connection between adjacent side beams 2221 is achieved through the side beam connector 228. Moreover, the first part 2281 and the second part 2282 of the side beam connector 228 are respectively inserted into the close connecting parts 225 of the two adjacent side beams 2221, hiding the side beam connector 228 within the two connected connecting parts 225. This reduces the space occupied by the side beam connector 228 on the outside of the connecting parts 225, making it easier to cover the connecting parts 225 with a heat insulation layer 2223 later.

[0223] In some embodiments of this disclosure, as shown in Figures 9 to 13, the end faces of the connecting portions 225 of two adjacent side beams 2221 that are close to each other are both inclined end faces 229. The inclined end faces 229 form an acute angle with the extension direction of the side beams 2221, and the inclined end faces 229 of the connecting portions 225 of two adjacent side beams 2221 that are close to each other are in contact with each other.

[0224] By abutting the inclined end faces 229 of the two connecting portions 225, the extending directions of the two adjacent side beams 2221 intersect, thereby forming a receiving space for the battery cell 1 by the connected side beams 2221 surrounding the outer periphery of the heat exchange plate 221. Furthermore, the abutting of the inclined end faces 229 increases the contact area at the joint of the two adjacent side beams 2221, improving the connection strength at the joint.

[0225] In some embodiments of this disclosure, as shown in Figures 9 to 13, the first part 2281 is bonded to the connecting part 225; and / or, the first part 2281 and the connecting part 225 are connected by a second fastener 231; and / or, the second part 2282 is bonded to the connecting part 225; and / or, the second part 2282 and the connecting part 225 are connected by a third fastener 232.

[0226] For example, the first part 2281 or the second part 2282 extends into the insertion groove 2251 of the connecting part 225, and the outer peripheral surface of the first part 2281 or the second part 2282 is bonded to the groove wall of the insertion groove 2251 by an adhesive.

[0227] For example, as shown in FIG12, the first part 2281 or the second part 2282 extends into the insertion groove 2251 of the connecting part 225, and the first part 2281 and the second part 2282 are respectively fixed to their respective connecting parts 225 by the second fastener 231 and the third fastener 232. The second fastener 231 and the third fastener 232 can be, but are not limited to, screws, bolts or rivets.

[0228] Thus, by adding an adhesive or fastening connection to the insertion of the first part 2281 or the second part 2282 with the connecting part 225, the connection strength between the first part 2281 or the second part 2282 and the connecting part 225 is increased, the connection strength between adjacent side beams 2221 is increased, the probability of damage to the housing 222 is reduced, and the service life of the battery device is extended. In addition, the high connection strength between adjacent side beams 2221 helps to reduce the probability of damage to the heat insulation layer 2223 due to breakage at the connection between the side beams 2221, thereby further improving the thermal management effect.

[0229] In some embodiments of this disclosure, after prefabrication, the side beam 2221 has the structure shown in FIG. 9, that is, the outer peripheral surface of the main body of the side beam 2221 is completely covered with a heat insulation layer 2223, while the outer peripheral surface of the connecting portions 225 at opposite ends of the main body is not covered with a heat insulation layer. During the assembly of the box body 2220, referring to FIGS. 10 and 11, the side beam connector 228 and the two side beams 2221 are assembled together, such that the first part 2281 and the second part 2282 of the side beam connector 228 are respectively inserted into the adjacent connecting portions 225 of the two side beams 2221. Then, the first part 2281 and the connecting portion 225 into which the first part 2281 is inserted are fixed together using the second fastener 231, and the second part 2282 and the connecting portion 225 into which the second part 2282 is inserted are fixed together using the third fastener 232, forming the corner portion 226 shown in FIG. 12. Finally, a heat insulation layer 2223 is injection molded onto the outer surface of the corner 226, forming the structure shown in Figure 13.

[0230] A second aspect of this disclosure provides an electrical device that includes a plurality of battery devices 100 as provided in the first aspect, the battery devices 100 being used to store or provide electrical energy.

[0231] Since the power-consuming device includes the battery device 100 provided in the first aspect, and the power-consuming device includes all the beneficial effects of the battery device 100, the battery device 100 has high thermal management capability.

[0232] A third aspect of this disclosure provides a vehicle 1000, including a body 400 and a chassis 500, with the body 400 located above the chassis 500; the vehicle 1000 also includes a plurality of battery devices 100 as provided in the first aspect, the battery devices 100 being used to provide electrical energy.

[0233] Since the vehicle 1000 includes the battery device 100 provided in the first aspect, and the vehicle 1000 includes all the beneficial effects of the battery device 100, the vehicle 1000 has high battery thermal management capability.

[0234] In some embodiments of this disclosure, the vehicle body 400 is detachably connected to the chassis 500.

[0235] The chassis 500 can be a skateboard chassis, and the body 400 is detachably connected to the skateboard chassis by multiple bolts around the body structure.

[0236] This configuration allows for the separation and decoupling of the body 400 and chassis 500, enabling the body 400 to be replaced as needed, shortening the development cycle and reducing costs. In other words, it also improves the integration of the chassis 500, making it compatible with various vehicle models.

[0237] In some embodiments of this disclosure, the vehicle body 400 and the chassis 500 together enclose the passenger compartment of the vehicle 1000, and the battery box 2 of the battery device 100 forms the floor of the passenger compartment.

[0238] By integrating the battery unit 100 into the floor of the passenger compartment, additional brackets and connectors can be reduced, which helps to reduce the weight of the vehicle 1000 and makes more efficient use of the interior space of the vehicle 1000.

[0239] The following describes specific examples of some embodiments of this disclosure with reference to the accompanying drawings.

[0240] As a specific example, a battery pack (battery device 100) is provided, including a battery case 2 and a plurality of battery cells 1 disposed in the receiving space of the battery case 2. The battery case 2 includes a main body 22 and a cover 21. The main body 22 includes a heat exchange plate 221 and a housing 222. The housing 222 is arranged in a ring shape. The cover 21 and the heat exchange plate 221 are respectively connected to opposite sides of the housing 222 to form the receiving space. The heat exchange plate 221 includes a first plate 2211 and a second plate 2212. Parts of the first plate 2211 and the second plate 2212 are stacked and form a flow channel 220 between them. The first plate 2211 is disposed close to the battery cells 1. Parts of the second plate 2212 are located on the side of the first plate 2211 that is away from the receiving space. The first plate 2211 guides the flow channel 220. The thermal conductivity of the second plate 2212 is higher than that of the first plate 2212. The second plate 2212 has flanges 2213 bent towards the side where the first plate 2211 is located. The housing 222 includes a main body 2220 and a mounting portion 223. The main body 2220 has a ring-shaped structure and cooperates with the heat exchange plate 221 to form an accommodating space. The mounting portion 223 is located on the outside of the main body 2220 and is used to cooperate with the vehicle body 400. The main body 2220 includes multiple side beams 2221 connected end-to-end in sequence. The outer surface of each side beam 2221 is fully covered with a heat insulation layer 2223. The thermal conductivity of the heat insulation layer 2223 is lower than that of the side beam 2221. The flanges 2213 of the second plate 2212 abut against the heat insulation layer 2223. The second plate 2212 is made of continuous fiber composite material. The edge beam 2221 is made of aluminum profile, and the insulation layer 2223 is made of continuous fiber composite material or fiber reinforced plastic.

[0241] The above embodiments are merely illustrative of the technical solutions of this disclosure and are not intended to limit it. Although this disclosure 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 disclosure, and all should be covered within the scope of this disclosure. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way.

Claims

1. A battery device, comprising: The enclosure is arranged in a ring shape; A heat exchange plate is located below the housing, forming an accommodating space together with the housing. A single battery cell is supported on the heat exchange plate and located within the accommodating space; The housing includes a main body and a mounting portion. The main body is disposed adjacent to the battery cell and the heat exchange plate, and is used to cooperate with the heat exchange plate to form the accommodating space. The mounting portion is disposed on the outside of the main body and is used to cooperate with the vehicle body. A heat insulation layer is provided between the main body and the heat exchange plate, and the thermal conductivity of the heat insulation layer is lower than that of the main body.

2. The battery device according to claim 1, wherein, The main body of the box mates with the mounting part, and the heat insulation layer is provided between the mating positions of the main body of the box and the mounting part.

3. The battery device according to claim 2, wherein, The heat insulation layer is provided on the outer surface of the main body of the box facing away from the mounting part; and / or The heat insulation layer is provided on the outer surface of the main body of the box facing away from the heat exchange plate.

4. The battery device according to any one of claims 1 to 3, wherein, The main body of the box includes aluminum profiles and / or steel profiles; and / or The mounting portion includes aluminum profiles and / or steel profiles.

5. The battery device according to any one of claims 1 to 4, wherein, The heat insulation layer includes a first resin matrix and a first fiber, wherein the first resin matrix and the first fiber are connected together.

6. The battery device according to claim 5, wherein, The first fiber is a first continuous fiber. The heat insulation layer includes multiple layers of continuous fiber braided layers nested from the inside out. The continuous fiber braided layer is woven from multiple first continuous fibers, and at least a portion of the multiple first continuous fibers are spirally arranged around the main body of the box.

7. The battery device according to claim 6, wherein, The main body of the box includes multiple side beams connected end to end in sequence, and the heat insulation layer is woven and pultruded on the outer periphery of the side beams using the side beams as core rods.

8. The battery device according to any one of claims 5 to 7, wherein, The material of the first resin matrix is ​​a thermosetting resin or a thermoplastic resin.

9. The battery device according to claim 5, wherein, The first fiber is a discontinuous fiber, and the first resin matrix is ​​impregnated in the discontinuous fiber.

10. The battery device according to claim 9, wherein, The main body of the box includes multiple side beams connected end to end in sequence. The insulation layer and the side beam are integrally extruded; or The heat insulation layer is injection molded on the outer periphery of the side beam.

11. The battery device according to claim 10, wherein, The first resin matrix is ​​made of thermoplastic resin.

12. The battery device according to any one of claims 5 to 11, wherein, The first fiber includes one or more combinations of organic fibers and inorganic fibers.

13. The battery device according to any one of claims 1 to 12, wherein, The mounting part is connected to the main body of the box by a first fastener.

14. The battery device according to any one of claims 1 to 13, wherein, The heat exchange plate includes a first plate and a second plate, at least a portion of which are stacked on top of each other, forming a flow channel between them for the heat exchange medium to flow. The first plate is disposed close to the battery cell, and a portion of the second plate is located on the side of the first plate facing away from the receiving space. The thermal conductivity of the first plate is higher than that of the second plate.

15. The battery device according to claim 14, wherein, The second plate has flanges formed around its four edges that bend toward the side where the first plate is located, and the flanges cover the outer peripheral surface of the first plate.

16. The battery device according to claim 15, wherein, The flange abuts against the insulation layer.

17. The battery device according to any one of claims 14 to 16, wherein, The second plate is a one-piece molded structure.

18. The battery device according to any one of claims 14 to 17, wherein, The second plate comprises a continuous fiber composite material.

19. The battery device according to claim 18, wherein, The second plate includes multiple layers of continuous fiber composite material, each layer of which includes a second continuous fiber and a second resin matrix, the second resin matrix being connected to the second continuous fiber.

20. The battery device according to claim 19, wherein, The second resin matrix is ​​a thermoplastic resin. The multi-layered continuous fiber composite material is laminated to form a continuous fiber composite board, and the continuous fiber composite board is molded to form the second board.

21. The battery device according to claim 19, wherein, The second resin matrix is ​​a thermosetting resin. The multi-layered continuous fiber composite material layers are combined to form a prepreg sheet, and at least one layer of the prepreg sheet is molded to form the second plate.

22. The battery device according to any one of claims 19 to 21, wherein, The second continuous fiber includes one or more combinations of organic fibers and inorganic fibers.

23. The battery device according to claim 12 or 22, wherein, The inorganic fibers include any one or any combination of glass fibers, carbon fibers, basalt fibers, aramid fibers, or boron fibers; and / or, the organic fibers include any one or any combination of aromatic polyamide fibers and ultra-high molecular weight polyethylene fibers.

24. The battery device according to claim 8, wherein, The thermosetting resin includes epoxy resin, polyurethane; and / or The thermoplastic resin includes polypropylene resin and / or polyamide resin.

25. The battery device according to any one of claims 14 to 17, wherein, The second plate comprises thermoplastic.

26. The battery device according to claim 25, wherein, The second plate is formed by injection molding or compression molding.

27. The battery device according to any one of claims 1 to 26, wherein, The main body of the box includes a plurality of side beams connected end to end in sequence. Each side beam includes a beam body and two connecting portions respectively connected to both ends of the beam body along its extension direction. At least a portion of the outer peripheral surface of each beam body is covered with the heat insulation layer. Two adjacent edge beams are connected at their close joints to form a corner. At least a portion of the outer surface of the corner is covered with the heat insulation layer, and the heat insulation layer covering the same corner is an integrally formed structure.

28. The battery device according to claim 27, wherein, The adjacent connecting portions of two adjacent side beams are welded together to form a weld, and the heat insulation layer covers the weld.

29. The battery device according to claim 27, wherein, The main body of the box also includes a side beam connector, which includes a first part and a second part connected together. The first part and the second part are respectively inserted into the connecting parts of two adjacent side beams that are close to each other.

30. The battery device according to claim 28 or 29, wherein, The end faces of the connecting portions of two adjacent side beams that are close to each other are both inclined end faces, and the inclined end faces form an acute angle with the extension direction of the side beams. The inclined end faces of the connecting portions of two adjacent side beams that are close to each other are in contact with each other.

31. The battery device according to claim 29, wherein, The first part is bonded to the connecting part; and / or The first part is connected to the connecting part by a second fastener; and / or The second part is bonded to the connecting part; and / or The second part is connected to the connecting part by a third fastener.

32. An electrical device comprising a plurality of battery devices as claimed in any one of claims 1 to 31, the battery devices being used to store or provide electrical energy.

33. A vehicle comprising: The vehicle body and chassis, wherein the vehicle body is located on top of the chassis; A plurality of battery devices as claimed in any one of claims 1 to 31, the battery devices being used to provide electrical energy.

34. The vehicle according to claim 33, wherein, The vehicle body and the chassis are detachably connected.

35. The vehicle according to claim 33 or 34, wherein, The vehicle body and the chassis together form the passenger compartment of the vehicle, and the battery box of the battery device forms the floor of the passenger compartment.

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