Battery device, power utilization device and vehicle

Abstract

The utility model discloses a battery device, a power utilization device and a vehicle. The battery device comprises a battery box and a plurality of single batteries, the battery box comprises a box body and a box cover, the box cover comprises a top plate and a side edge structure surrounding the top plate, the top plate is made of a continuous fiber composite material, the side edge structure and the top plate are made of different materials, a first connecting hole is formed in the side edge structure, and the box cover is connected with the box body through the first connecting hole; and an accommodating space for accommodating the battery monomers is formed between the box cover and the box body. The top plate is made of the continuous fiber composite material, so that the strength of the top plate is high, and the strength of the box cover is improved. Moreover, as the first connecting holes are formed in the side edge structure of the box cover, the first connecting holes do not need to be formed in the continuous fiber composite material, and continuous fibers are not easy to break, so that the strength of the box cover is further improved, the strength of the battery box is favorably improved, and the durability of the battery device is improved. The battery device, the power utilization device and the vehicle provided by the utility model have high durability.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to battery devices, electrical devices, and vehicles. Background Technology

[0002] 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. In the field of energy storage, batteries can be installed in energy storage boxes or directly on the user side.

[0003] With the continuous development of battery technology, the industry has put forward higher requirements for the durability of batteries. Utility Model Content

[0004] To address the aforementioned technical problems, this application provides a battery device, an electrical device, and a vehicle with high durability.

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

[0006] The first aspect of this application provides a battery device, including a battery box and a plurality of battery cells; the battery box includes a box body and a box cover, the box cover includes a top plate and a side structure surrounding the top plate, the top plate is made of a continuous fiber composite material, the side structure is made of a different material than the top plate, the side structure has a first connecting hole, the box cover is connected to the box body through the first connecting hole, and a receiving space for accommodating battery cells is formed between the box cover and the box body.

[0007] In this embodiment, the top plate of the cover is made of continuous fiber composite material, resulting in higher strength and thus improving the overall strength of the cover. Furthermore, since the first connecting hole is formed on the side structure of the cover, there is no need to create a first connecting hole in the continuous fiber composite material, reducing the likelihood of continuous fiber breakage and further enhancing the cover's strength. Moreover, when the cover has an upwardly recessed space, meaning the side structure extends beyond the top plate in the direction towards the casing, the side structure surrounding the top plate uses a material different from the continuous fiber composite material. This requires the top plate and side structure to be formed separately, rather than integrally molded, reducing the need for bending and stretching the continuous fibers, thereby lowering the likelihood of breakage and further improving the cover's strength and the battery device's durability. Furthermore, because the probability of continuous fiber breakage is low, the probability of exposed continuous fibers is also reduced; therefore, this embodiment also improves the appearance quality.

[0008] In some embodiments, the top plate includes multiple layers of continuous fiber composite material, each layer of which includes continuous fibers and a thermoplastic resin matrix, the thermoplastic resin matrix being connected to the continuous fibers.

[0009] Composite materials formed using continuous fibers and thermoplastic resin matrices have the characteristics of high strength, high rigidity and high toughness, which helps to improve the structural strength and structural stiffness of the roof slab.

[0010] In some embodiments, the side structure is at least connected to the outer peripheral surface of the top plate.

[0011] The top plate has a plywood structure, with continuous fiber composite layers connected only by a small amount of resin, posing a risk of delamination, especially at the edges. If the ends of the continuous fibers are exposed, delamination is more likely to occur after aging. Therefore, this embodiment connects side structures to the outer peripheral surface of the top plate, preventing the edges from being exposed and reducing the possibility of delamination due to aging, thereby further improving the durability of the top plate.

[0012] In some embodiments, the side structure is connected at least to the surface of the top plate facing the enclosure.

[0013] This increases the connection area between the side structure and the top plate, improves the connection strength between the two, thereby increasing the overall structural strength of the cover and thus improving the durability of the battery device.

[0014] In some embodiments, the side structure is at least partially supported between the top plate and the housing.

[0015] Thus, when the battery box is subjected to a force from the cover toward the body, the side structure located between the top plate and the body provides support to the top plate, reducing the likelihood of deformation and damage to the top plate. This further enhances the strength of the cover and, consequently, the durability of the battery device.

[0016] In some embodiments, the enclosure includes a base plate and side beams surrounding the base plate, and a first connection hole of the enclosure cover is connected to the side beams by fasteners.

[0017] Thus, by connecting the side structure to the side beam through the first connecting hole, the box body and the box cover are connected, forming an enclosure space to house and protect the battery cells. Furthermore, the side structure and the side beam are connected by fasteners, increasing the connection strength and further enhancing the durability of the battery assembly.

[0018] In some embodiments, a sealing gasket is sandwiched between the side structure and the side beam.

[0019] In this way, by inserting a sealing gasket between the side structure and the side beam, the sealing performance at the joint between the box body and the box cover is improved, thereby reducing the chance of dust, moisture and other substances entering the battery box, as well as reducing the chance of gas leakage in the battery box.

[0020] In some embodiments, the first connecting hole penetrates the side structure along the thickness direction of the top plate, and when projected along the thickness direction of the top plate, there is no overlap between the projection of the first connecting hole and the projection of the top plate.

[0021] In this way, fasteners can be inserted into the first connecting hole and the side beam of the box along the thickness direction of the top plate, which simplifies the assembly operation of the battery box, helps to improve assembly efficiency, and improves the manufacturing efficiency of the battery device.

[0022] In some embodiments, the top plate is formed with through openings spaced apart sequentially along the outer peripheral edge of the top plate, and the side structure includes a through portion at least partially filled in the through opening, the through portion being formed with a first connecting hole provided in the through opening.

[0023] The top plate has a through-hole, and at least part of the through-hole portion of the side structure is filled within the through-hole. This increases the contact area between the top plate and the side structure, improving their connection strength and thus enhancing the strength of the cover. Furthermore, the through-hole allows for a larger volume of the through-hole portion, satisfying both the size requirement for forming the through-hole and the strength requirement for the connection between the through-hole portion and the top plate, thereby improving the durability of the battery assembly.

[0024] In some embodiments, the first connecting hole includes a first hole segment and a second hole segment connected to the first hole segment. The second hole segment is located on the side of the first hole segment facing the housing, and the cross-sectional area of ​​the second hole segment is smaller than the cross-sectional area of ​​the first hole segment. The fastener passes through the first hole segment and is fixed to the housing through the second hole segment.

[0025] Thus, the first connecting hole is divided into two parts: the first connecting hole and the second hole section. This not only enables the connection between the cover and the body, but also allows the first hole section, with its larger cross-sectional area, to accommodate the end of the fastener that is away from the body. This reduces the possibility of the fastener extending beyond the first connecting hole from the side away from the body. In fact, the entire end of the fastener away from the body can be accommodated within the first hole section. This not only improves the aesthetics of the battery box but also reduces the space occupied by the fastener extending beyond the first connecting hole, thereby increasing the space occupied by the battery box and improving the volumetric energy density of the battery device.

[0026] In some embodiments, the through hole includes a first sealing surface that abuts against the housing, a first connecting hole that passes through the first sealing surface, and the through hole also includes a first connecting surface that is connected to the surface of the top plate facing the housing, with portions of the first connecting surface and the first sealing surface disposed opposite to each other along the thickness direction of the top plate.

[0027] This design allows the via portion to be supported between the top plate and the casing. When the battery box is subjected to a force from the cover toward the casing, the via portion located between the top plate and the casing provides support to the top plate, reducing the likelihood of deformation and damage to the top plate. This further enhances the strength of the cover and, consequently, the durability of the battery pack.

[0028] In some embodiments, the orifice is a notch formed on the outer peripheral surface of the top plate.

[0029] By designing the through-hole as a notch, the fillable space within the through-hole is increased, facilitating a larger volume of the portion filled within the through-hole. This provides sufficient area for the arrangement of the first connecting hole. Furthermore, the notch forms an opening on the outer peripheral surface of the top plate, increasing the area of ​​communication between the through-hole and the external space. This facilitates the speed at which raw materials fill the through-hole during the forming of the side structure, improving manufacturing efficiency. Additionally, since the through-hole is connected to the inner wall of the notch, the possibility of delamination of continuous fibers at the end located on the inner surface of the notch is reduced, further enhancing the durability of the top plate.

[0030] In some embodiments, the side structure includes: a first part, connected to at least a portion of the outer peripheral surface of the top plate located between adjacent through openings; and a second part, connected to the surface of the top plate facing the housing, one end of the second part being connected to the first part and the other end extending toward the center of the top plate.

[0031] Thus, the first part, connected to at least a portion of the outer peripheral surface of the top plate between adjacent through-holes, reduces the likelihood of exposed continuous fibers at the edge of the top plate, and reduces the possibility of delamination due to aging of the continuous fibers, thereby further improving the durability of the top plate. Furthermore, the second part, connected to the surface of the top plate facing the housing, increases the connection area between the side structure and the top plate, improves the connection strength between them, enhances the strength of the housing cover, and further improves the durability of the battery assembly.

[0032] In some embodiments, the side structure further includes: a third part, one end of which is connected to the second part and the other end of which extends toward the housing; a fourth part, which is connected to the end of the third part toward the housing and is spaced apart from and opposite to the second part along the thickness direction of the top plate, wherein the surface of the fourth part facing away from the second part is a second sealing surface that abuts against the housing.

[0033] The third part allows for a larger dimension of the side structure along the thickness of the top plate. This not only improves the strength of the side structure but also allows the side structure and top plate to form an upward-recessed space, increasing the volume of the accommodating space. The fourth part creates a larger second sealing surface, increasing the contact area between the side structure and the side beams of the enclosure, thus improving the stability and sealing of the connection between the cover and the enclosure.

[0034] In some embodiments, the first part, the second part, the third part and the fourth part are respectively connected to the through hole part.

[0035] By connecting the first, second, third, and fourth parts to the through-hole section, the various parts are connected into a whole structure, which improves the strength of the side structure and facilitates the integrated manufacturing of each part, thereby improving production efficiency.

[0036] In some embodiments, the through-hole portion includes a first sealing surface that abuts against the housing, and the second sealing surface of the fourth portion is coplanar with and connected to the first sealing surface.

[0037] With this configuration, the first and second sealing surfaces are connected to form the sealing surface 217 of the side structure. The sealing surface is a continuous annular plane, which can fully abut against the side beam of the housing, improving the sealing performance at the connection.

[0038] In some embodiments, the side structure further includes a first reinforcing rib connecting the second, third and fourth portions.

[0039] The addition of the first reinforcing rib improves the structural strength of the side structure, further enhancing the strength of the casing and improving the durability of the battery device.

[0040] In some embodiments, the top plate comprises a continuous fiber composite plate formed by multiple layers of continuous fiber composite material.

[0041] In this way, the top plate can be directly made from continuous fiber composite board by cutting, without the need for molding, which reduces production steps and improves production efficiency.

[0042] In some embodiments, multiple layers of continuous fiber composite material are laminated to form a continuous fiber composite board, and the continuous fiber composite board is molded to form a top plate.

[0043] The multi-layered continuous fiber composite material is first laminated to form a continuous fiber composite board, which is then molded into a top plate. Using a molding process can more accurately ensure the shape and dimensional precision of the top plate, maximizing its strength and rigidity.

[0044] In some embodiments, the top plate has an uneven structure.

[0045] Thus, by achieving a degree of stretching during mold closing of the continuous fiber composite board, the surface stiffness can be further enhanced.

[0046] In some embodiments, continuous fibers include one or more combinations of organic fibers and inorganic fibers.

[0047] In some embodiments, inorganic fibers include any one or any combination of glass 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.

[0048] In some embodiments, at least two continuous fiber composite layers are laid with continuous fibers in a unidirectional manner, and the laying angles of the continuous fibers in adjacent continuous fiber composite layers are different.

[0049] This is because the layup angle of continuous fibers has a significant impact on the performance of composite material layers. The layup direction of continuous fibers affects the stress distribution inside the composite material layer. Different layup angles of continuous fibers in two adjacent continuous fiber composite material layers help to optimize the performance of the composite material layer in different directions.

[0050] In some embodiments, the layup angles of the continuous fibers in two adjacent continuous fiber composite layers are perpendicular to each other.

[0051] Continuous fibers laid in different directions can support each other, forming a more stable structure. This cross-laying method helps resist loads from different directions, thereby improving the overall strength of the material. Furthermore, vertically laid continuous fiber composite layers can reduce material deformation in a certain direction, thereby enhancing the stability of the material and improving the strength and stiffness of the top plate.

[0052] In some embodiments, in two adjacent continuous fiber composite material layers, the continuous fiber layup angle of one layer is 0°, and the continuous fiber layup angle of the other layer is 90°.

[0053] This laying method can significantly improve the overall mechanical properties of the roof slab and its ability to adapt to various load conditions.

[0054] In some embodiments, the continuous fibers of at least one continuous fiber composite layer are interwoven with each other.

[0055] The interwoven continuous fibers create a tighter and more robust structure, thus enhancing the overall strength of the roof. This increased strength helps the roof maintain its structural integrity and stability when subjected to various external forces. Furthermore, the interwoven continuous fibers increase the roof's energy absorption capacity under impact, thereby improving its toughness. This enhanced toughness helps reduce damage to the roof from accidental impacts or collisions, extending its service life.

[0056] In some embodiments, the material of the side structure includes thermoplastics, including fiber-reinforced plastics.

[0057] The side structure uses thermoplastic as its material, offering numerous advantages such as excellent moldability, recyclability, high chemical stability, light weight, and reprocessability. Thermoplastics possess excellent moldability, facilitating the processing and manufacture of complex structural components, which allows for greater flexibility and precision in the design and manufacturing of the side structure. Furthermore, fiber-reinforced plastics, which incorporate high-performance fibers such as glass fiber and carbon fiber, significantly enhance the strength, stiffness, and corrosion resistance of the side structure while maintaining light weight and good processability. This allows the side structure to better maintain its structural integrity and stability under external forces, thereby improving the overall strength of the lid.

[0058] In some embodiments, the side structure is injection molded around the perimeter of the top plate.

[0059] Injection molding allows the side structure to be tightly integrated with the four edges of the top plate, a one-piece design that significantly enhances the stability of the lid. During injection molding, the plastic material fills the mold cavity under high pressure, forming a strong connection with the top plate, thereby improving the bonding strength between the side structure and the top plate, making the lid more robust and durable.

[0060] In some embodiments, the resin type of the side structure is the same as that of the top plate.

[0061] Using the same type of resin for the side structure and top plate improves material compatibility. This allows for a good bond between the two materials when injection molding plastic into the edges of the top plate, preventing adverse reactions or interface problems and thus enhancing the stability and structural reliability of the lid.

[0062] In some embodiments, the side structure is a one-piece molded structure.

[0063] One-piece molding significantly improves the structural strength of side structures. By integrating multiple components into a single unit through a one-piece molding process, the number of connection points and seams between components is reduced, thereby enhancing the overall rigidity and stability of the side structure.

[0064] In some embodiments, the thickness of the top plate is in the range of 0.8 mm to 3 mm.

[0065] Thus, by setting the thickness of the top plate within the aforementioned suitable range, the strength requirements can be met without taking up too much space due to excessive thickness, which would affect the volumetric energy density of the battery device.

[0066] In some embodiments, the lid further includes an additional layer, which is disposed on the side of the top plate facing the box body and stacked on top of the top plate. The material of the additional layer is different from that of the top plate, and the additional layer is connected to the side structure.

[0067] The strength of the lid is increased by adding an additional layer of a different material to the side of the top plate facing the container. This additional layer is also connected to the side structure, further enhancing the lid's strength.

[0068] In some embodiments, the additional layer is made of the same material as the side structure, and the two are formed as a single molded structure.

[0069] This design improves the connection strength between the additional layer and the side structure, enhances the strength of the lid, and also simplifies the manufacturing process and increases manufacturing efficiency.

[0070] In some embodiments, the thickness of the top plate is in the range of 0.4 mm to 3 mm; and / or, the thickness of the additional layer is in the range of 2 mm to 3 mm.

[0071] Thus, by setting the thickness of the top plate and the additional layer within the aforementioned suitable range, the strength requirements of the case cover can be met without taking up too much space due to excessive thickness, thereby affecting the volumetric energy density of the battery device. Furthermore, due to the addition of the additional layer, the minimum thickness of the top plate can be as low as 0.4 mm, which still meets the strength requirements of the case cover.

[0072] In some embodiments, at least one second reinforcing rib is provided on the side of the top plate facing the housing.

[0073] The addition of a second reinforcing rib improves the structural strength of the cover, thereby enhancing the strength of the battery pack.

[0074] In some embodiments, a plurality of second reinforcing ribs are provided, and a portion of the plurality of second reinforcing ribs are arranged to cross each other.

[0075] The second reinforcing rib is connected in this way, which further improves the structural strength of the cover, thereby further improving the strength of the battery device.

[0076] In some embodiments, the second reinforcing rib is connected to the side structure, and the two are formed as an integral structure.

[0077] The second reinforcing rib is connected to the side structure, which helps to improve the strength of both. Furthermore, the two form a single molded structure, further enhancing the connection strength between the second reinforcing rib and the side structure, thereby improving the structural strength of the lid. In addition, the single-piece molding also improves manufacturing efficiency.

[0078] In some embodiments, the thickness of the top plate is in the range of 0.4 mm to 3 mm.

[0079] Thus, by setting the thickness of the top plate within the aforementioned suitable range, the strength requirements of the cover can be met without taking up too much space due to excessive thickness, thereby affecting the volumetric energy density of the battery device. Furthermore, due to the addition of the second reinforcing rib, the minimum thickness of the top plate can be as low as 0.4 mm, which also meets the strength requirements of the cover.

[0080] In some embodiments, the side structure includes a first surface that is connected to and flush with the surface of the top plate facing away from the receiving space and a sealing surface that abuts against the housing, wherein the distance between the first surface and the sealing surface along the thickness direction of the top plate is in the range of 10 mm to 40 mm.

[0081] The first surface is connected to and flush with the surface of the top plate facing away from the receiving space, making the upper surface of the cover a flat and continuous surface, improving aesthetics and also helping to increase the volumetric energy density of the battery device. Furthermore, setting the distance between the first surface and the sealing surface within the aforementioned range satisfies the strength requirements of the side structure and also creates an upward-facing recessed space between the side structure and the top plate. Thus, by using the cooperation of the top plate and side structure, a molded cover is replaced, reducing the probability of continuous fibers breaking due to bending and stretching, thereby improving the strength of the cover and the durability of the battery device.

[0082] A second aspect of this application 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.

[0083] Because the battery device has good durability, the electrical device that includes the battery device also has good durability.

[0084] A third aspect of this application 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.

[0085] Because the battery unit has good durability, the vehicle that includes the battery unit also has good durability.

[0086] In some embodiments, the vehicle body and chassis are detachably connected.

[0087] 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.

[0088] 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.

[0089] By integrating the battery pack into the passenger compartment floor, additional brackets and connectors can be reduced, which helps to reduce the overall vehicle weight and allows for more efficient use of the vehicle's interior space.

[0090] The beneficial effects of the embodiments disclosed herein include: providing a battery device, electrical device, and vehicle with high durability. Attached Figure Description

[0091] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0092] Figure 1 This is a schematic diagram of the structure of a vehicle according to one or more embodiments;

[0093] Figure 2 This is an exploded perspective view of a battery device according to one or more embodiments;

[0094] Figure 3 A three-dimensional structural schematic diagram of a battery cell according to one or more embodiments;

[0095] Figure 4 This is a three-dimensional exploded view of a battery cell according to one or more embodiments;

[0096] Figure 5 This is a three-dimensional structural diagram of a battery box according to one or more embodiments;

[0097] Figure 6 A cross-sectional view of a battery box according to one or more embodiments;

[0098] Figure 7 for Figure 6 Enlarged view of point A in the middle;

[0099] Figure 8 This is a structural schematic diagram of a top plate according to one or more embodiments;

[0100] Figure 9 This is a three-dimensional structural diagram of a box lid according to one or more embodiments;

[0101] Figure 10 for Figure 9 Enlarged view of point B in the middle;

[0102] Figure 11 A cross-sectional view of a box lid according to one or more embodiments;

[0103] Figure 12 Another sectional view of the box lid according to one or more embodiments;

[0104] Figure 13 This is another sectional view of the box lid according to one or more embodiments;

[0105] Figure 14 This is a perspective structural diagram of another structure of the box lid according to one or more embodiments;

[0106] Figure 15 This is a three-dimensional structural diagram of the inner surface of a box lid according to one or more embodiments;

[0107] Figure 16 This is a three-dimensional exploded structural diagram of a vehicle according to one or more embodiments.

[0108] Explanation of reference numerals in the attached figures

[0109] 1000 Vehicle; 100 Battery Unit; 200 Controller; 300 Motor; 400 Body; 500 Chassis; 1 Battery Cell; 11 Casing; 111 End Cap; 112 Housing; 12 Electrode Assembly; 120 Tab; 13 Electrode Terminal; 14 Pressure Relief Mechanism; 2 Battery Box; 21 Box Cover; 211 Top Plate; 2111 Through Hole; 2112 Concave-convex Structure; 212 Side Structure; 2121 First Connecting Hole; 2122 Through Hole Section; 212 3 First hole section; 2124 Second hole section; 2125 First sealing surface; 2126 First connecting surface; 2127 First part; 2128 Second part; 2129 Third part; 2130 Fourth part; 2131 Second sealing surface; 2132 First reinforcing rib; 214 Additional layer; 215 Second reinforcing rib; 216 First surface; 217 Sealing surface; 218 Bushing; 22 Housing; 221 Base plate; 222 Side beam; 23 Fastener; 24 Sealing gasket. Detailed Implementation

[0110] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0111] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0112] In the description of the embodiments of this application, technical terms such as "first," "second," and "third" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0113] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0114] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0115] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0116] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0117] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0118] The following is a detailed description of this application.

[0119] 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. To extend their service life, the industry has placed higher demands on the durability of batteries.

[0120] The battery pack cover is an important component for sealing, protecting, structural support, and thermal management of the battery pack. The cover is mainly used for sealing and protection to prevent water, dust and other impurities from entering the battery pack. Together with the casing, it forms the battery box of the battery pack, providing the necessary mechanical strength and support to protect the battery modules and other components inside the battery pack from mechanical impact and vibration. Therefore, the strength of the battery box is related to the durability of the battery pack.

[0121] The inventors of this application discovered that currently, battery boxes for battery packs are generally made of steel or aluminum, which not only hinders the lightweighting of the battery pack but also affects its strength, thereby impacting its durability. Therefore, the inventors of this application, through research, discovered that using continuous fiber composite materials to replace the original steel or aluminum materials helps reduce the weight of the battery box and also improves its strength, thus enhancing the durability of the battery pack.

[0122] The inventors of this application have further discovered that the battery box cover has an upwardly recessed space of a certain depth. Continuous fiber composite materials generally need to be manufactured using a molding process. Due to the low elongation at break of the fibers, when the molding depth is deep, the elongation at break of the fibers will exceed their elongation at break, resulting in breakage. This reduces the strength of the cover and affects the durability of the battery pack. Furthermore, opening connecting holes in the continuous fiber composite material for connecting the box body will cause the continuous fibers to break, which will also affect the strength of the cover and the durability of the battery pack.

[0123] The inventors of this application discovered through research that by using a continuous fiber composite material for the bottom wall of the recessed space in the battery case lid, and using other materials for the side walls of the recessed space, with connecting holes provided in the side walls made of other materials, the molding process for forming the recessed space is eliminated. This prevents the continuous fibers from undergoing significant bending and stretching, making them less prone to breakage, thus improving the strength of the battery case lid. Furthermore, eliminating the need for connecting holes in the continuous fiber composite material reduces the risk of fiber breakage, further enhancing the lid's strength. Therefore, the durability of the battery pack is improved.

[0124] Based on this design concept, the inventors of this application have designed a battery device, which includes a battery box and multiple battery cells housed in the housing space of the battery box. The battery box includes a box body and a box cover. The box cover includes a top plate and a side structure surrounding the top plate. The top plate is made of a continuous fiber composite material. The side structure is made of a different material than the top plate. The side structure has a first connecting hole. The box cover is connected to the box body through the first connecting hole. A housing space for accommodating battery cells is formed between the box cover and the box body.

[0125] In this design, by using continuous fiber composite material for the top plate of the cover, the strength of the top plate is increased, thereby improving the overall strength of the cover. Furthermore, since the first connecting hole is formed in the side structure of the cover, there is no need to create a first connecting hole in the continuous fiber composite material, reducing the risk of continuous fiber breakage and further enhancing the cover's strength. Moreover, when the cover has an upwardly recessed space, meaning the side structure extends beyond the top plate in the direction towards the casing, the side structure surrounding the top plate uses a different material than the continuous fiber composite material. This requires the top plate and side structure to be formed separately, rather than being integrally molded. Therefore, this design eliminates the need for bending and excessive stretching of the continuous fibers, reducing the possibility of breakage and thus improving the cover's strength and the battery pack's durability. Furthermore, the low probability of continuous fiber breakage reduces the likelihood of exposed continuous fibers, thus also improving the overall appearance quality.

[0126] The battery apparatus mentioned in the embodiments of this application 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.

[0127] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] As an example, battery cell assemblies can also be housed in a battery box by directly fixing multiple battery cells to the battery box.

[0132] The technical solutions described in the embodiments of this application 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.

[0133] The technical solutions described in the embodiments of this application are applicable to various energy storage devices that use battery devices, such as energy storage containers or energy storage cabinets.

[0134] 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 application. The description is as follows with reference to the accompanying drawings.

[0135] Figure 1 This is a structural schematic diagram of a vehicle 1000 according to one or more embodiments.

[0136] 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 vehicles, etc. For example... Figure 1 As shown, a battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0137] In some embodiments of this application, 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.

[0138] Figure 2 This is an exploded perspective view of a battery device 100 according to one or more embodiments.

[0139] like Figure 2 As shown, 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 the at least one battery cell 1 is received in the receiving space.

[0140] In some embodiments of this application, the battery box 2 includes a box body 22 and a box cover 21, with the box cover 21 covering the box body 22, thereby forming the receiving space between the box body 22 and the box cover 21.

[0141] The housing 22 can be a hollow structure with one end open, and both the cover 21 and the housing 22 can be hollow structures with one side open, with the open side of the cover 21 fitting over the open side of the housing 22. Of course, the battery box 2 formed by the cover 21 and the housing 22 can be of various shapes, such as a cylinder, a cuboid, etc.

[0142] 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 housing 22 and the 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 battery modules, and then these battery modules are connected in series, parallel, or in a mixed manner to form an assembly, which is then housed within the receiving space formed by the housing 22 and the 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.

[0143] In this embodiment of the application, 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.

[0144] 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 the embodiments of this application are not limited to this.

[0145] 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 application does not have any particular limitations.

[0146] Figure 3 A three-dimensional structural schematic diagram of a battery cell 1 according to one or more embodiments; Figure 4 This is a three-dimensional exploded structural diagram of a battery cell according to one or more embodiments.

[0147] Battery cell 1 refers to the smallest unit that makes up a battery. Please refer to... Figure 3 and Figure 4The 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 in the accommodating space. The end cap 111 closes the opening of the shell 112.

[0148] 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.

[0149] In some embodiments of this application, 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 application does not impose any special limitations on this. In some embodiments of this application, 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 made of plastic, rubber, etc.

[0150] The housing 112 is a component used to cooperate with the end cap 111 to form the internal environment of the battery cell 1. This 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. This application embodiment does not impose any special limitations on this.

[0151] 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.

[0152] Below, refer to Figures 5 to 16 Some embodiments of this application will be described in detail.

[0153] Figure 5 This is a three-dimensional structural diagram of a battery box according to one or more embodiments; Figure 6 A cross-sectional view of a battery box according to one or more embodiments; Figure 7 for Figure 6 Enlarged view of point A in the middle; Figure 8 This is a structural schematic diagram of a top plate according to one or more embodiments; Figure 9 This is a three-dimensional structural diagram of a box lid according to one or more embodiments; Figure 10 for Figure 9 Enlarged view of point B in the middle; Figure 11 A cross-sectional view of a box lid according to one or more embodiments; Figure 12 Another sectional view of the box lid according to one or more embodiments; Figure 13 This is another sectional view of the box lid according to one or more embodiments; Figure 14 This is a perspective structural diagram of another structure of the box lid according to one or more embodiments; Figure 15 This is a three-dimensional structural diagram of the inner surface of a box lid according to one or more embodiments; Figure 16 This is a three-dimensional exploded structural diagram of a vehicle according to one or more embodiments.

[0154] The first aspect of this application provides a battery device 100, such as... Figures 5 to 7As shown, the battery device 100 includes a battery box 2 and a plurality of battery cells 1 housed in the housing space of the battery box 2. The battery box 2 includes a box body 22 and a box cover 21. The box cover 21 includes a top plate 211 and a side structure 212 surrounding the top plate 211. The material of the top plate 211 includes a continuous fiber composite material. The material of the side structure 212 is different from that of the top plate 211. The side structure 212 has a first connecting hole 2121. The box cover 21 is connected to the box body 22 through the first connecting hole 2121. A housing space for accommodating the battery cells 1 is formed between the box cover 21 and the box body 22.

[0155] For example, the side structure 212 extends beyond the top plate 211 in the direction toward the box body 22, and the side structure 212 and the top plate 211 form a recessed space that is recessed in the direction away from the box body 22.

[0156] The material of the side structure 212 is different from that of the top plate 211. The material of the side structure 212 can be, but is not limited to, ordinary plastics, reinforced plastics, thermoplastic polymers, etc. Reinforced plastics include glass fiber reinforced plastics, natural fiber reinforced plastics, aramid fiber reinforced plastics, etc. In addition, it also includes plastics whose performance is enhanced by adding wear-resistant materials such as polytetrafluoroethylene (PTFE) and molybdenum disulfide.

[0157] For example, the side structure 212 is connected to the outer peripheral edge of the top plate 211. The side structure 212 is connected to the outer peripheral surface of the top plate 211, and / or, the side structure 212 is connected to the surface of the top plate 211 facing the housing 22, and / or, the side structure 212 is connected to the surface of the top plate 211 facing away from the housing 22.

[0158] For example, the side structure 212 is connected to the outer peripheral edge of the top plate 211 by injection molding.

[0159] For example, the side structure 212 is attached to the outer peripheral edge of the top plate 211 by adhesive bonding.

[0160] In this embodiment, the top plate 211 of the cover 21 is made of continuous fiber composite material, which increases the strength of the top plate 211 and improves the overall strength of the cover 21. Furthermore, since the first connecting hole 2121 is formed in the side structure 212 of the cover 21, there is no need to open the first connecting hole 2121 in the continuous fiber composite material, reducing the likelihood of continuous fiber breakage and further improving the strength of the cover 21. Moreover, when the cover 21 has an upwardly recessed space, that is, when the side structure 212 extends beyond the top plate 211 in the direction towards the housing 22, the side structure 212 surrounding the top plate 211 is made of a material different from the continuous fiber composite material. This requires the top plate 211 and the side structure 212 to be formed separately, rather than integrally molded, reducing the need for continuous fiber bending and stretching, thus lowering the possibility of continuous fiber breakage and further improving the strength of the cover 21 and the durability of the battery device 100. Furthermore, since the probability of continuous fiber breakage is low, the probability of continuous fiber exposure is also reduced. Therefore, the embodiments of this application are also beneficial to improving appearance quality.

[0161] In some embodiments of this application, such as Figures 5 to 7 As shown, the top plate 211 includes multiple layers of continuous fiber composite material, each layer of which includes continuous fibers and a thermoplastic resin matrix, with the thermoplastic resin matrix connecting the continuous fibers.

[0162] Composite materials formed using continuous fibers and thermoplastic resin matrices have the characteristics of high strength, high rigidity and high toughness, which helps to improve the structural strength and structural stiffness of the top plate 211.

[0163] In some embodiments of this application, such as Figure 7 As shown, the side structure 212 is connected to at least the outer peripheral surface of the top plate 211.

[0164] It is understandable that the outer peripheral surface of the top plate 211 is the side surface located at the edge of the top plate 211, connecting the two large surfaces of the top plate 211, and is sometimes also called the edge surface.

[0165] The top plate 211 has a plywood structure, with continuous fiber composite layers connected only by a small amount of resin, posing a risk of delamination, especially at the edges of the top plate 211. If the ends of the continuous fibers are exposed, delamination is more likely to occur after aging. To address this, this embodiment connects side structures 212 to the outer peripheral surface of the top plate 211, preventing the edges of the top plate 211 from being exposed, reducing the possibility of delamination due to aging, and thus further improving the durability of the top plate 211.

[0166] In some embodiments of this application, such as Figure 6 and Figure 7As shown, the side structure 212 is connected to at least the surface of the top plate 211 facing the housing 22.

[0167] This increases the connection area between the side structure 212 and the top plate 211, improves the connection strength between the two, thereby improving the overall structural strength of the cover 21 and thus improving the durability of the battery device 100.

[0168] In some embodiments of this application, such as Figure 7 As shown, at least a portion of the side structure 212 is supported between the top plate 211 and the box 22.

[0169] Thus, when the battery box 2 is subjected to a force from the cover 21 toward the body 22, the part of the side structure 212 located between the top plate 211 and the body 22 provides support for the top plate 211, reducing the probability of deformation and damage to the top plate 211, thereby further improving the strength of the cover 21 and thus improving the durability of the battery device 100.

[0170] In some embodiments of this application, such as Figure 6 and Figure 7 As shown, the box body 22 includes a bottom plate 221 and a side beam 222 surrounding the bottom plate 221. The first connecting hole 2121 of the box cover 21 is connected to the side beam 222 by a fastener 23.

[0171] It is understandable that the side beam 222 has a second connecting hole, and the fastener 23 passes through the first connecting hole 2121 of the cover 21 and the second connecting hole of the box body 22, so that the cover 21 and the box body 22 are connected as one unit.

[0172] For example, fasteners 23 include, but are not limited to, bolts, studs, screws, nuts, pins, rivets, etc.

[0173] For example, the cover 21 is located above the body 22, and the battery cell 1 is supported on the bottom plate 221 of the body 22.

[0174] Thus, by connecting the side structure 2122 to the side beam 222 through the first connecting hole 2121, the box body 22 and the box cover 21 are connected, forming an enclosure space between them to accommodate the battery cell 1 and protect it. Moreover, the side structure 212 and the side beam 222 are connected by fasteners 23, which increases the connection strength between them and further improves the durability of the battery device 100.

[0175] In some embodiments of this application, such as Figure 7 As shown, a sealing gasket 24 is sandwiched between the side structure 212 and the side beam 222.

[0176] The sealing gasket 24 includes, but is not limited to, rubber sealing gaskets, polyurethane sealing gaskets, polytetrafluoroethylene sealing gaskets, foamed silicone sealing gaskets, etc.

[0177] Thus, by sandwiching a sealing gasket 24 between the side structure 212 and the side beam 222, the sealing performance at the mating position of the box body 22 and the box cover 21 is improved, thereby reducing the probability of dust, moisture and other substances entering the battery box 2, as well as reducing the probability of gas leakage in the battery box 2.

[0178] In some embodiments of this application, such as Figure 7 As shown, the first connecting hole 2121 penetrates the side structure 212 along the thickness direction of the top plate 211. When projected along the thickness direction of the top plate 211, there is no overlap between the projection of the first connecting hole 2121 and the projection of the top plate 211.

[0179] Thus, the first connecting hole 2121 is located in the outer periphery of the top plate 211, and the fastener 23 can be inserted into the first connecting hole 2121 and the side beam 222 of the box 22 along the thickness direction of the top plate 211, which simplifies the assembly operation of the battery box 2, helps to improve the assembly efficiency, and improves the manufacturing efficiency of the battery device 100.

[0180] In some embodiments of this application, such as Figures 7 to 10 As shown, the top plate 211 has through holes 2111 arranged sequentially at intervals along the outer periphery of the top plate 211, and the side structure 212 includes a through hole portion 2122 that is at least partially filled in the through hole 2111. The through hole portion 2122 has a first connecting hole 2121 provided in the through hole 2111.

[0181] For example, the orifice 2111 can be a hole with a complete annular inner wall, or it can be a notch with a discontinuous inner wall along the circumferential direction.

[0182] It is understandable that, such as Figure 10 As shown, the first connecting hole 2121 passes through the portion of the through hole 2122 located inside the through hole opening 2111, that is, at least a portion of the first connecting hole 2121 is located inside the through hole opening 2111.

[0183] The top plate 211 is provided with a through-hole 2111, and at least a portion of the through-hole portion 2122 of the side structure 212 is filled within the through-hole 2111. This increases the contact area between the top plate 211 and the side structure 212, improving their connection strength and thus enhancing the strength of the cover 21. Furthermore, the through-hole 2111 allows for a larger volume of the through-hole portion 2122, satisfying both the size requirement for the through-hole 2111 and the connection strength requirement between the through-hole portion 2122 and the top plate 211, thereby improving the durability of the battery device 100.

[0184] In some embodiments of this application, such as Figures 7 to 10 As shown, the first connecting hole 2121 includes a first hole segment 2123 and a second hole segment 2124 connected to the first hole segment 2123. The second hole segment 2124 is located on the side of the first hole segment 2123 facing the housing 22, and the cross-sectional area of ​​the second hole segment 2124 is smaller than the cross-sectional area of ​​the first hole segment 2123. The fastener 23 passes through the first hole segment 2123 and the second hole segment 2124 to be fixed to the housing 22.

[0185] For example, such as Figure 7 As shown, the fastener 23 is a screw. The screw passes through the first hole section 2123 and the second hole section 2124 to be fixed to the housing 22. The head of the screw is stuck in the surface of the first hole section 2123 that is close to the second hole section 2124. The cylindrical part of the screw passes through the second hole section 2124 and is inserted into and locked in the second connecting hole of the side beam 222.

[0186] For example, the cross-section of the first hole segment 2123 can be, but is not limited to, circular, square, or hexagonal shapes.

[0187] Thus, the first connecting hole 2121 is divided into two parts: the first hole segment 2123 and the second hole segment 2124. This not only enables the connection between the cover 21 and the body 22, but also allows the first hole segment 2123, with its larger cross-sectional area, to accommodate the end of the fastener 23 that is away from the body 22. This reduces the possibility of the fastener 23 extending beyond the first connecting hole 2121 from the side away from the body 22. It can even accommodate the entire end of the fastener 23 that is away from the body 22 within the first hole segment 2123. This not only improves the aesthetics of the battery box 2, but also reduces the space occupied by the fastener 23 extending beyond the first connecting hole 2121, thereby increasing the space occupied by the battery box 2 and improving the volumetric energy density of the battery device 100.

[0188] In some embodiments of this application, such as Figure 7 As shown, a bushing 218 is embedded in the inner wall of the second hole section 2124.

[0189] This design improves the strength and rigidity of the second hole section 2124 of the side structure 212, which helps to improve the connection strength between the cover 21 and the box body 22.

[0190] For example, the side structure 212 is injection molded. In the injection molding process, a bushing 218 is pre-embedded at the position of the second hole section 2124. This allows the bushing 218 to achieve a good fit with the inner wall of the second hole section 2124, making it less likely to detach. This method is also more convenient than installing the bushing 218 later.

[0191] In some embodiments of this application, such as Figure 7 As shown, the through hole 2122 includes a first sealing surface 2125 that abuts against the housing 22, and a first connecting hole 2121 that passes through the first sealing surface 2125. The through hole 2122 also includes a first connecting surface 2126 that is connected to the surface of the top plate 211 facing the housing 22. The portions of the first connecting surface 2126 and the first sealing surface 2125 are arranged opposite to each other along the thickness direction of the top plate 211.

[0192] For example, with Figure 7 Taking the orientation shown as an example, the first sealing surface 2125 is located at... Figure 7 The portion to the left of the dashed line is positioned opposite to the first connecting surface 2126 along the thickness direction of the top plate 211. That is, the portion of the through hole 2122 located to the left of the dashed line is supported between the top plate 211 and the side beam 222 of the box body 22, thereby improving the structural strength of the box cover 21.

[0193] This arrangement allows the via portion 2122 to be supported between the top plate 211 and the housing 22. When the battery box 2 is subjected to a force from the cover 21 toward the housing 22, the portion of the via portion 2122 located between the top plate 211 and the housing 22 provides support to the top plate 211, reducing the probability of deformation and damage to the top plate 211. This further improves the strength of the cover 21 and, consequently, the durability of the battery device 100.

[0194] In some embodiments of this application, such as Figure 8 and Figure 9 As shown, the orifice 2111 is a notch formed on the outer peripheral surface of the top plate 211.

[0195] By setting the through-hole 2111 as a notch, the fillable space within the through-hole 2111 is increased, which facilitates increasing the volume of the portion of the through-hole 2122 filled within the through-hole 2111. This provides sufficient arrangement area for the first connecting hole 2121. Furthermore, the notch forms an opening on the outer peripheral surface of the top plate 211, increasing the area of ​​communication between the through-hole 2111 and the external space. This facilitates the speed at which raw materials are filled into the through-hole 2111 during the forming of the side structure 212, thereby improving the manufacturing efficiency of the side structure 212. In addition, since the through-hole 2122 is connected to the inner wall of the notch, the possibility of delamination of continuous fibers located on the inner surface of the notch is reduced, further improving the durability of the top plate 211.

[0196] In some embodiments of this application, such as Figure 10 and Figure 11As shown, the side structure 212 also includes a first part 2127 and a second part 2128. The first part 2127 is connected to at least a portion of the outer peripheral surface of the top plate 211 located between adjacent through holes 2111. The second part 2128 is connected to the surface of the top plate 211 facing the housing 22. One end of the second part 2128 is connected to the first part 2127, and the other end extends toward the center of the top plate 211.

[0197] Thus, the first part 2127 is connected to at least a portion of the outer peripheral surface of the top plate 211 located between adjacent through holes 2111, reducing the probability of continuous fibers being exposed at the edge of the top plate 211 and reducing the possibility of continuous fibers aging and delamination, thereby further improving the durability of the top plate 211. Furthermore, the second part 2128 is connected to the surface of the top plate 211 facing the housing 22, increasing the connection area between the side structure 212 and the top plate 211, improving the connection strength between them, increasing the strength of the housing cover 21, and further improving the durability of the battery device 100.

[0198] In some embodiments of this application, such as Figure 10 and Figure 11 As shown, the side structure 212 also includes a third part 2129 and a fourth part 2130. One end of the third part 2129 is connected to the second part 2128, and the other end extends toward the housing 22. The fourth part 2130 is connected to the end of the third part 2129 toward the housing 22, and is spaced apart from and opposite to the second part 2128 along the thickness direction of the top plate 211. The surface of the fourth part 2130 facing away from the second part 2128 is the second sealing surface 2131 that abuts against the housing 22.

[0199] The third part 2129 is designed to increase the thickness of the side structure 212 along the top plate 211, which not only improves the strength of the side structure 212 but also allows the side structure 212 and the top plate 211 to form an upwardly recessed space, thereby increasing the volume of the accommodating space. The fourth part 2130 forms a larger second sealing surface 2131, which increases the contact area between the side structure 212 and the side beam 222 of the box body 22, improving the stability and sealing of the connection between the box cover 21 and the box body 22.

[0200] In some embodiments of this application, such as Figures 10 to 13 As shown, the first part 2127, the second part 2128, the third part 2129 and the fourth part 2130 are respectively connected to the through hole part 2122.

[0201] The first part 2127, the second part 2128, the third part 2129 and the fourth part 2130 are connected to the through hole part 2122 respectively, so that the various parts are connected into a whole structure, which improves the strength of the side structure 212 and facilitates the integrated manufacturing of various parts, thus improving production efficiency.

[0202] In some embodiments of this application, such as Figures 10 to 13 As shown, the through hole 2122 includes a first sealing surface 2125 that abuts against the housing 22, and the second sealing surface 2131 of the fourth part 2130 is coplanar with and connected to the first sealing surface 2125.

[0203] With this configuration, the first sealing surface 2125 and the second sealing surface 2131 are connected to form the sealing surface 217 of the side structure 212. The sealing surface 217 is a continuous annular plane, which can fully abut against the side beam 222 of the housing 22, improving the sealing performance at the connection.

[0204] In some embodiments of this application, such as Figure 10 and Figure 12 As shown, the side structure 212 also includes a first reinforcing rib 2132 connecting the second part 2128, the third part 2129 and the fourth part 2130.

[0205] The addition of the first reinforcing rib 2132 enhances the structural strength of the side structure 212, further improves the strength of the housing 22, and enhances the durability of the battery device 100.

[0206] For example, such as Figure 10 As shown in the figure, the portion of the side structure 212 located between the dotted lines that extend along the edge of the top plate 211 belongs to the through hole portion 2122 of the side structure 212. The portion located between adjacent through hole portions 2122 includes the first portion 2127, the second portion 2128, the third portion 2129, the fourth portion 2130, and the first reinforcing rib 2132.

[0207] In some embodiments of this application, such as Figure 8 As shown, the top plate 211 includes a continuous fiber composite plate formed by multiple layers of continuous fiber composite material. Each layer of continuous fiber composite material includes continuous fibers and a thermoplastic resin matrix, with the thermoplastic resin matrix connecting the continuous fibers.

[0208] For example, the top plate 211 can be formed by cutting a continuous fiber composite board. Specifically, the continuous fiber composite board is cut into boards with appropriate length and width dimensions, and then through holes 2111 are cut into the boards to form the top plate 211.

[0209] Thus, the top plate 211 can be directly made from continuous fiber composite board by cutting, without the need for molding, which reduces production steps and improves production efficiency.

[0210] In some embodiments of this application, such as Figure 8As shown, a continuous fiber composite board is formed by multiple layers of continuous fiber composite material, and the continuous fiber composite board is molded to form a top plate 211.

[0211] The multi-layered continuous fiber composite material is first laminated to form a continuous fiber composite board, which is then molded to form the top plate 211. The molding process can more accurately ensure the shape and dimensional accuracy of the top plate 211, and maximize the strength and rigidity of the top plate 211.

[0212] In some embodiments of this application, such as Figure 14 As shown, the top plate 211 has a concave-convex structure 2112.

[0213] For example, the concave-convex structure 2112 includes a protruding structure that protrudes toward the receiving space and / or a recessed structure that is recessed toward the receiving space. It is understood that this concave-convex structure 2112 is a protruding structure or a recessed structure with a shallow depth.

[0214] Thus, by achieving a degree of stretching during mold closing of the continuous fiber composite board, the surface stiffness can be further enhanced.

[0215] In some embodiments of this application, the continuous fiber includes one or more combinations of organic fibers and inorganic fibers.

[0216] In some embodiments of this application, inorganic fibers include any one or any combination of glass 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.

[0217] In some embodiments of this application, at least two continuous fiber composite material layers are laid with continuous fibers in one direction, and the laying angles of the continuous fibers in adjacent continuous fiber composite material layers are different.

[0218] This is because the layup angle of continuous fibers has a significant impact on the performance of composite material layers. The layup direction of continuous fibers affects the stress distribution inside the composite material layer. Different layup angles of continuous fibers in two adjacent continuous fiber composite material layers help to optimize the performance of the composite material layer in different directions.

[0219] In some embodiments of this application, the layup angles of the continuous fibers in two adjacent continuous fiber composite layers are perpendicular to each other.

[0220] Continuous fibers in different directions can support each other, forming a more stable structure. This cross-laying method helps resist loads from different directions, thereby improving the overall strength of the material. Furthermore, the vertically laid continuous fiber composite layer can reduce the deformation of the material in a certain direction, thereby enhancing the stability of the material and improving the strength and stiffness of the top plate 211.

[0221] In some embodiments of this application, in two adjacent continuous fiber composite material layers, the continuous fiber layup angle of one layer is 0°, and the continuous fiber layup angle of the other layer is 90°.

[0222] It should be noted that 0° refers to the length direction of the top plate 211, and 90° refers to the width direction of the top plate 211. 0° and 90° are perpendicular to each other. The dimension of the top plate 211 along its length is greater than its dimension along its width.

[0223] This laying method can significantly improve the overall mechanical properties of the top plate 211 and its ability to adapt to various load conditions.

[0224] In some embodiments of this application, the continuous fibers of at least one continuous fiber composite layer are interwoven with each other.

[0225] The interwoven continuous fibers create a denser and more robust structure, thereby enhancing the overall strength of the roof plate 211. This increased strength helps the roof plate 211 maintain structural integrity and stability when subjected to various external forces. Furthermore, the interwoven continuous fibers increase the energy absorption capacity of the roof plate 211 when subjected to impacts, thus improving its toughness. This enhanced toughness helps reduce the degree of damage to the roof plate 211 when subjected to accidental impacts or collisions, extending its service life.

[0226] In some embodiments of this application, the material of the side structure 212 includes thermoplastic plastics, including fiber-reinforced plastics.

[0227] The side structure 212 is made of thermoplastic, which offers several advantages, including good moldability, recyclability, high chemical stability, light weight, and reprocessability. Thermoplastic has excellent moldability, making it easy to process and manufacture complex shapes, which gives the side structure 212 greater flexibility and precision in its design and manufacturing process.

[0228] Furthermore, fiber-reinforced plastics are thermoplastics with added high-performance fibers, such as glass fiber and carbon fiber. The side structure 212 uses fiber-reinforced plastics from thermoplastics, which can significantly improve its strength, stiffness, and corrosion resistance, while maintaining a lighter weight and good processing performance. This allows the side structure 212 to better maintain structural integrity and stability when subjected to external forces, thereby improving the overall strength of the lid 21.

[0229] In some embodiments of this application, the side structure 212 is injection molded around the perimeter of the top plate 211.

[0230] Through injection molding, the side structure 212 is tightly integrated with the four edges of the top plate 211, and this integrated design significantly enhances the stability of the lid 21. During the injection molding process, the plastic material fills the mold cavity under high pressure, forming a firm connection with the top plate 211, thereby improving the bonding strength between the side structure 212 and the top plate 211, making the lid 21 more robust and durable.

[0231] In some embodiments of this application, the resin type of the side structure 212 is the same as that of the top plate 211.

[0232] The side structure 212 and the top plate 211 use the same type of resin, which improves the material compatibility between them. Therefore, when plastic material is injection molded onto the edge of the top plate 211, the two materials can bond well together without adverse reactions or interface problems, thus improving the stability and structural reliability of the lid 21.

[0233] In some embodiments of this application, the side structure 212 is a one-piece molded structure.

[0234] The one-piece molding structure can significantly improve the structural strength of the side structure 212. Through the one-piece molding process, multiple components can be integrated into a whole, reducing the connection points and seams between components, thereby improving the overall rigidity and stability of the side structure 212.

[0235] In some embodiments of this application, such as Figure 11 As shown, the thickness H1 of the top plate 211 is in the range of 0.8mm to 3mm.

[0236] For example, the thickness H1 of the top plate 211 can be, but is not limited to, 0.8mm, 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, or 3mm.

[0237] Thus, by setting the thickness of the top plate 211 within the aforementioned suitable range, the strength requirements can be met without taking up too much space due to excessive thickness, thereby affecting the volumetric energy density of the battery device 100.

[0238] In some embodiments of this application, such as Figure 11 As shown, the lid 21 also includes an additional layer 214, which is disposed on the side of the top plate 211 facing the box body 22 and is stacked on top of the top plate 211. The material of the additional layer 214 is different from that of the top plate 211, and the additional layer 214 is connected to the side structure 212.

[0239] For example, the additional layer 214 is connected to the surfaces of the top plate 211 that face each other.

[0240] For example, the additional layer 214 is injection molded onto the surface of the top plate 211 facing the housing 22.

[0241] The strength of the lid 21 is improved by providing an additional layer 214 of a different material than the top plate 211 on the side of the top plate 211 facing the box body 22. Furthermore, the additional layer 214 is also connected to the side structure 212, further enhancing the strength of the lid 21.

[0242] In some embodiments of this application, such as Figure 11 As shown, the additional layer 214 is made of the same material as the side structure 212, and the two are formed as a single molded structure.

[0243] For example, both the additional layer 214 and the side structure 212 are made of fiber-reinforced plastic and are formed into a single molded structure by injection molding.

[0244] This design improves the connection strength between the additional layer 214 and the side structure 212, enhances the strength of the lid 21, and also simplifies the manufacturing process and improves manufacturing efficiency.

[0245] In some embodiments of this application, such as Figure 11 As shown, the thickness H1 of the top plate 211 is in the range of 0.4 mm to 3 mm; and / or, the thickness H2 of the additional layer 214 is in the range of 2 mm to 3 mm.

[0246] For example, the thickness H1 of the top plate 211 can be, but is not limited to, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, and 3mm. The thickness H2 of the additional layer 214 can be, but is not limited to, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, and 3mm.

[0247] For example, the thickness H1 of the top plate 211 is 0.4 mm, and the thickness H2 of the additional layer 214 is 2 mm.

[0248] Thus, by setting the thickness of the top plate 211 and the thickness of the additional layer 214 within the aforementioned suitable range, the strength requirements of the cover 21 can be met without taking up too much space due to excessive thickness, thereby affecting the volumetric energy density of the battery device 100. Furthermore, due to the addition of the additional layer 214, the thickness H1 of the top plate 211 can be as small as 0.4 mm, which also meets the strength requirements of the cover 21, further reducing space occupation and thus improving the volumetric energy density of the battery device 100.

[0249] In some embodiments of this application, such as Figure 15 As shown, the top plate 211 has at least one second reinforcing rib 215 on the side facing the box body 22.

[0250] By setting the second reinforcing rib 215, the structural strength of the cover 21 can be improved, thereby improving the strength of the battery device 100.

[0251] In some embodiments of this application, such as Figure 15 As shown, there are multiple second reinforcing ribs 215, and some of the multiple second reinforcing ribs 215 are arranged to cross each other.

[0252] The second reinforcing rib 215 is connected in this way, which further improves the structural strength of the cover 21, thereby further improving the strength of the battery device 100.

[0253] In some embodiments of this application, such as Figure 15 As shown, the second reinforcing rib 215 is connected to the side structure 212, and the two form an integral structure.

[0254] The second reinforcing rib 215 is connected to the side structure 212, which helps to improve the strength of both. Furthermore, the two are formed into an integral structure, which further improves the connection strength between the second reinforcing rib 215 and the side structure 212, thereby improving the structural strength of the cover 21. In addition, the integral molding also helps to improve manufacturing efficiency.

[0255] In some embodiments of this application, an additional layer 214 is provided on the side of the top plate 211 facing the box body 22, and a second reinforcing rib 215 is provided on the side of the additional layer 214 facing the box body 22. The additional layer 214, the second reinforcing rib 215, and the side structure 212 are all made of fiber-reinforced plastic, and the three are formed into an integral molded structure. In this way, the structural strength of the box cover 21 is further improved.

[0256] In some embodiments of this application, at least one second reinforcing rib 215 is provided on the side of the top plate 211 facing the box body 22, and the thickness H1 of the top plate 211 is in the range of 0.4mm to 3mm.

[0257] For example, the thickness H1 of the top plate 211 can be, but is not limited to, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, or 3mm.

[0258] Thus, by setting the thickness H1 of the top plate 211 within the aforementioned suitable range, the strength requirements of the cover 21 can be met without taking up too much space due to excessive thickness, thereby affecting the volumetric energy density of the battery device 100. In addition, due to the provision of the second reinforcing rib 215, the thickness H1 of the top plate 211 can be as small as 0.4 mm, which can also meet the strength requirements of the cover 21.

[0259] In some embodiments of this application, such as Figures 10 to 13 As shown, the side structure 212 includes a first surface 216 that is connected to and flush with the surface of the top plate 211 facing away from the receiving space, and a sealing surface 217 that abuts against the housing 22. The distance H3 between the first surface 216 and the sealing surface 217 along the thickness direction of the top plate 211 is in the range of 10mm to 40mm.

[0260] For example, such as Figures 10 to 13 As shown, the sealing surface 217 includes a first sealing surface 2125 of the through hole portion 2122 and a second sealing surface 2131 of the fourth portion 2130. The first sealing surface 2125 and the second sealing surface 2131 are connected and flush.

[0261] For example, such as Figure 13 As shown, the distance H3 between the first surface 216 and the sealing surface 217 along the thickness direction of the top plate 211 can be, but is not limited to, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, or 40mm.

[0262] It is understood that the first surface 216 and the sealing surface 217 are the upper and lower surfaces of the side structure 212 as a whole, respectively. Therefore, the distance H3 between the first surface 216 and the sealing surface 217 is the height of the side structure 212 as a whole.

[0263] The first surface 216 is connected to and flush with the surface of the top plate 211 facing away from the receiving space, making the upper surface of the cover 21 a flat and continuous surface, improving aesthetics and also helping to increase the volumetric energy density of the battery device 100. Furthermore, setting the distance H3 between the first surface 216 and the sealing surface 217 within the aforementioned range satisfies both the strength and height requirements of the side structure 212, creating a recessed space between the side structure 212 and the top plate 211 facing away from the housing 22. Thus, the cooperation between the top plate 211 and the side structure 212 replaces the molded top cover, reducing the probability of continuous fibers breaking due to bending and stretching, thereby improving the strength of the cover 21 and enhancing the durability of the battery device 100.

[0264] A second aspect of this application provides an electrical device that includes a plurality of battery devices 100 provided in the first aspect, the battery devices 100 being used to store or provide electrical energy.

[0265] Because the battery device 100 has good durability, the electrical device including the battery device 100 also has good durability.

[0266] A third aspect of this application provides a vehicle 1000, including a body 400 and a chassis 500, as well as a plurality of battery devices 100 provided in the first aspect, wherein the body 400 is located above the chassis 500; the battery devices 100 are used to provide electrical energy.

[0267] Because the battery device 100 has good durability, the vehicle 1000 including the battery device 100 also has good durability.

[0268] In some embodiments of this application, the vehicle body 400 and the chassis 500 are detachably connected.

[0269] The chassis 500 can be a skateboard chassis, and the body 400 can be detachably connected to the skateboard chassis via multiple bolts around the body structure.

[0270] 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.

[0271] In some embodiments of this application, 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.

[0272] 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 overall vehicle weight and makes more efficient use of the interior space of the vehicle 1000.

[0273] The following describes specific examples of some embodiments of this application with reference to the accompanying drawings.

[0274] As a specific example, a battery pack (battery device 100) is provided, comprising an upper housing (cover 21) and a lower housing (housing 22). The upper and lower housings enclose a receiving space, which houses multiple battery cells (cells 1). The upper housing includes a laminate of continuous fiber reinforced thermoplastic composite material (continuous fiber composite material) (top plate 211) and flanges (side structures 212) located at the periphery of the laminate. The laminate is flat, and the flanges are made of plastic, formed by injection molding at the periphery of the laminate. In this example, the continuous fiber reinforced thermoplastic composite laminate remains flat after being made into a sheet, eliminating the need for molding. Therefore, it maintains a good appearance after the upper housing is formed, and the continuous fibers do not bend or break, ensuring good mechanical properties. In this example, all edges of the laminate in the upper housing are wrapped by flanges, effectively reducing the probability of delamination after weathering. In this example, the flange portion of the upper housing comprises a double-layer structure (the structure formed by the second part 2128, the third part 2129, and the fourth part 2130), which has excellent rigidity, facilitates sealing, and the thickness of each part is determined by the injection mold, making it easy to control the size and shape accuracy of the flange portion. In this example, all bolt holes (first connection hole 2121) in the upper housing are injection molded, eliminating the need for post-drilling, which helps maintain the strength of the flange portion. Furthermore, during injection molding, bushings (shoulder sleeve 218) can be pre-embedded at the hole positions (hole opening 2111), resulting in a tight connection with the plastic after molding, making it less prone to detachment.

[0275] In this example, the laminate does not require molding, improving fiber continuity and aesthetic appearance. Furthermore, without molding, it avoids the need for heating to a molten state (heating temperature is based on the melting point of the plastic material, generally exceeding 230℃). This solution only requires heating to above 120℃, saving energy costs. Moreover, the flange includes a double-layer structure (the structure formed by the second part 2128, the third part 2129, and the fourth part 2130). By adding reinforcing ribs (first reinforcing rib 2132) between the two layers, a flange surface (sealing surface 217) with excellent rigidity can be obtained, improving sealing reliability. Reinforcing ribs (second reinforcing rib 215) on the back of the laminate further enhance rigidity, reducing the thickness of the continuous fiber reinforced thermoplastic composite laminate used, thereby reducing cost and weight.

[0276] The manufacturing method of the upper box in the above example is briefly described below.

[0277] First, continuous fiber reinforced thermoplastic composite laminate is selected as the raw material. The preferred laminate layering is 0° and 90° staggered layup, but a woven layer is also acceptable. The thickness can be selected between 0.8mm and 3mm depending on the size of the cover.

[0278] Then, cut the laminate to the required size, and make notches or holes around the edges to leave bolt holes (through hole 2111), forming a shape like... Figure 8 The structure shown.

[0279] Finally, the cut laminate is heated and placed into an injection mold as an insert in the insert injection molding process. Heating the laminate allows for better bonding with the injection-molded plastic. The injection-molded plastic is selected from the same resin type as the thermoplastic composite laminate, or a type that bonds well with it, forming a... Figures 10 to 13 The structure shown.

[0280] The above steps involve first fabricating a laminate, and then injection molding a flange part along the edge of the laminate.

[0281] In addition to the methods described above, injection molding can also be performed around two or more layers of continuous fiber-reinforced thermoplastic composite unidirectional strips with different fiber angles that are stacked but not yet bonded. Simultaneously, the two or more layers of continuous fiber-reinforced thermoplastic composite unidirectional strips bond together to form a laminate. This method essentially moves the laminate formation process to the injection molding step.

[0282] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and all should be covered within the scope of the specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way.

Claims

1. A battery device, characterized in that, include: Multiple battery cells; A battery box includes a box body and a box cover. The box cover includes a top plate and a side structure surrounding the top plate. The top plate is made of a continuous fiber composite material. The side structure is made of a different material than the top plate. The side structure has a first connecting hole. The box cover is connected to the box body through the first connecting hole. A receiving space for accommodating the battery cell is formed between the box cover and the box body.

2. The battery device according to claim 1, characterized in that, The top plate includes multiple layers of continuous fiber composite material, each layer of which includes continuous fibers and a thermoplastic resin matrix, wherein the thermoplastic resin matrix connects the continuous fibers.

3. The battery device according to claim 2, characterized in that, The side structure is connected to at least the outer peripheral surface of the top plate.

4. The battery device according to claim 2 or 3, characterized in that, The side structure is connected to at least the surface of the top plate facing the housing.

5. The battery device according to claim 4, characterized in that, At least a portion of the side structure is supported between the top plate and the housing.

6. The battery device according to claim 5, characterized in that, The enclosure includes a base plate and side beams surrounding the base plate, and the first connecting hole of the enclosure cover is connected to the side beams by fasteners.

7. The battery device according to claim 6, characterized in that, A sealing gasket is sandwiched between the side structure and the side beam.

8. The battery device according to any one of claims 2, 3, 5 to 7, characterized in that, The first connecting hole penetrates the side structure along the thickness direction of the top plate. Projecting along the thickness direction of the top plate, there is no overlap between the projection of the first connecting hole and the projection of the top plate.

9. The battery device according to claim 8, characterized in that, The top plate has through holes that are spaced apart sequentially along the outer periphery of the top plate. The side structure includes a through hole portion that is at least partially filled in the through hole opening, and the through hole portion is formed with the first connecting hole provided in the through hole opening.

10. The battery device according to claim 9, characterized in that, The first connecting hole includes a first hole segment and a second hole segment connected to the first hole segment. The second hole segment is located on the side of the first hole segment facing the housing, and the cross-sectional area of ​​the second hole segment is smaller than the cross-sectional area of ​​the first hole segment. The fastener passes through the first hole segment and is secured to the housing through the second hole segment.

11. The battery device according to claim 9 or 10, characterized in that, The through-hole includes a first sealing surface that abuts against the housing, and the first connecting hole passes through the first sealing surface. The through-hole portion also includes a first connecting surface connected to the surface of the top plate facing the housing, and portions of the first connecting surface and the first sealing surface are arranged opposite to each other along the thickness direction of the top plate.

12. The battery device according to any one of claims 9 or 10, characterized in that, The through-hole is a notch formed on the outer peripheral surface of the top plate.

13. The battery device according to claim 12, characterized in that, The side structure includes: The first part is at least a portion of the outer peripheral surface of the top plate located between adjacent through-holes; The second part is connected to the surface of the top plate facing the box body. One end of the second part is connected to the first part, and the other end extends toward the center of the top plate.

14. The battery device according to claim 13, characterized in that, The side structure also includes: The third part has one end connected to the second part and the other end extending toward the box body; The fourth part is connected to the end of the third part facing the box body, and is spaced apart from and opposite to the second part along the thickness direction of the top plate. The surface of the fourth part facing away from the second part is the second sealing surface that abuts against the box body.

15. The battery device according to claim 14, characterized in that, The first part, the second part, the third part, and the fourth part are respectively connected to the through hole part.

16. The battery device according to claim 14 or 15, characterized in that, The through-hole includes a first sealing surface that abuts against the housing. The second sealing surface of the fourth part is coplanar with and connected to the first sealing surface.

17. The battery device according to claim 14 or 15, characterized in that, The side structure also includes a first reinforcing rib connecting the second part, the third part, and the fourth part.

18. The battery device according to any one of claims 2, 3, 5 to 7, 9, 10, 13 to 15, characterized in that, The top plate includes a continuous fiber composite board formed by the multi-layered continuous fiber composite material layers.

19. The battery device according to any one of claims 2, 3, 5 to 7, 9, 10, 13 to 15, characterized in that, The multi-layered continuous fiber composite material is combined to form a continuous fiber composite board, and the continuous fiber composite board is molded to form the top plate.

20. The battery device according to claim 19, characterized in that, The top plate has an uneven structure.

21. The battery device according to any one of claims 2, 3, 5 to 7, 9, 10, 13 to 15 and 20, characterized in that, The continuous fiber includes one of organic fiber and inorganic fiber.

22. The battery device according to claim 21, characterized in that, The inorganic fiber includes any one of glass fiber, aramid fiber or boron fiber; and / or, the organic fiber includes any one of aromatic polyamide fiber or ultra-high molecular weight polyethylene fiber.

23. The battery device according to any one of claims 2, 3, 5 to 7, 9, 10, 13 to 15, 20 and 22, characterized in that, The continuous fibers of at least two layers of the continuous fiber composite material are laid in a single direction, and the laying angles of the continuous fibers of adjacent layers of the continuous fiber composite material are different.

24. The battery device according to claim 23, characterized in that, The continuous fibers of two adjacent continuous fiber composite layers are laid at angles perpendicular to each other.

25. The battery device according to claim 24, characterized in that, In two adjacent continuous fiber composite material layers, the continuous fiber layup angle of one layer is 0°, and the continuous fiber layup angle of the other layer is 90°.

26. The battery device according to any one of claims 2, 3, 5 to 7, 9, 10, 13 to 15, 22, 24 and 25, characterized in that, The continuous fibers of at least one layer of the continuous fiber composite material are interwoven with each other.

27. The battery device according to any one of claims 2, 3, 5 to 7, 9, 10, 13 to 15, 22, 24 and 25, characterized in that, The side structure is made of thermoplastic, including fiber-reinforced plastic.

28. The battery device according to claim 27, characterized in that, The side structure is injection molded around the perimeter of the top plate.

29. The battery device according to claim 27, characterized in that, The resin type of the side structure is the same as that of the top plate.

30. The battery device according to any one of claims 1 to 3, 5 to 7, 9, 10, 13 to 15, 22, 24, 25, 28 and 29, characterized in that, The side structure is a one-piece molded structure.

31. The battery device according to any one of claims 1 to 3, 5 to 7, 9, 10, 13 to 15, 22, 24, 25, 28 and 29, characterized in that, The thickness of the top plate is in the range of 0.8mm to 3mm.

32. The battery device according to any one of claims 1 to 3, 5 to 7, 9, 10, 13 to 15, 22, 24, 25, 28 and 29, characterized in that, The lid also includes an additional layer, which is disposed on the side of the top plate facing the box body and is stacked on top of the top plate. The material of the additional layer is different from that of the top plate, and the additional layer is connected to the side structure.

33. The battery device according to claim 32, characterized in that, The additional layer is made of the same material as the side structure, and the two are formed as a single molded structure.

34. The battery device according to claim 32, characterized in that, The thickness of the top plate is in the range of 0.4mm to 3mm; and / or The thickness of the additional layer is in the range of 2mm to 3mm.

35. The battery device according to any one of claims 1 to 3, 5 to 7, 9, 10, 13 to 15, 22, 24, 25, 28, 29, 33 and 34, characterized in that, The top plate has at least one second reinforcing rib on the side facing the box.

36. The battery device according to claim 35, characterized in that, The second reinforcing rib is provided in multiple parts, and a portion of the multiple second reinforcing ribs are arranged to intersect each other.

37. The battery device according to claim 35, characterized in that, The second reinforcing rib is connected to the side structure, and the two form an integral structure.

38. The battery device according to claim 35, characterized in that, The thickness of the top plate is in the range of 0.4mm to 3mm.

39. The battery device according to any one of claims 1 to 3, 5 to 7, 9, 10, 13 to 15, 22, 24, 25, 28, 29, 33, 34, 36 to 38, characterized in that, The side structure includes a first surface that is connected to and flush with the surface of the top plate facing away from the receiving space, and a sealing surface that abuts against the box body. The distance between the first surface and the sealing surface along the thickness direction of the top plate is in the range of 10mm to 40mm.

40. An electrical device, characterized in that, The electrical device includes a plurality of battery devices as described in any one of claims 1 to 39, the battery devices being used to store or provide electrical energy.

41. A vehicle, characterized in that, include: 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 39, the battery devices being used to provide electrical energy.

42. The vehicle according to claim 41, characterized in that, The vehicle body and the chassis are detachably connected.

43. The vehicle according to claim 41, characterized in that, 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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