Battery device and electric device

Abstract

Embodiments of the present application provide a battery device and a power consumption device. The battery device comprises a box assembly and a battery cell. The box assembly has a first accommodating cavity, and the battery cell is arranged in the first accommodating cavity. The box assembly comprises an outer cladding layer. The outer cladding layer comprises an insulating structure layer and a fiber composite material layer. The insulating structure layer forms at least part of the inner wall of the box assembly facing the first accommodating cavity. The fiber composite material layer forms at least part of the outer wall of the box assembly facing away from the first accommodating cavity. At least part of the area of the box assembly further comprises an intermediate layer, and the outer cladding layer clads the intermediate layer. The battery device provided by the embodiments of the present application is conducive to reducing the mass of the box assembly and improving the structural strength of the box assembly, thereby being conducive to improving the energy density and the structural strength of the battery device. In addition, to some extent, it is also conducive to reducing the manufacturing cost of the box assembly.

Description

Technical Field

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

[0002] Batteries are being used more and more widely in daily life and industry. For example, new energy vehicles equipped with batteries are already widely used. In addition, batteries are increasingly being used in the field of energy storage.

[0003] In battery-powered electrical devices, the battery can provide all or part of the power. Therefore, improving the energy density of the battery device while enhancing structural strength has become an important research direction in this field. Utility Model Content

[0004] In view of this, the embodiments of this application aim to provide a battery device and an electrical device that improve the energy density of the battery device while increasing structural strength.

[0005] Therefore, a first aspect of the present disclosure provides a battery device, the battery device including a housing assembly and a battery cell, the housing assembly having a first receiving cavity, and the battery cell disposed within the first receiving cavity;

[0006] The housing assembly includes an outer covering layer, which includes an insulating structural layer and a fiber composite material layer. The insulating structural layer forms at least a portion of the inner wall of the housing assembly facing the first receiving cavity, and the fiber composite material layer forms at least a portion of the outer wall of the housing assembly facing away from the first receiving cavity.

[0007] At least a portion of the housing assembly also includes an intermediate layer, which is covered by the outer covering layer.

[0008] The battery device provided in this disclosure includes a housing assembly and individual battery cells. The housing assembly has a first receiving cavity, within which the individual battery cells are disposed, and the housing assembly protects the individual battery cells. By configuring the housing assembly to include an outer covering layer comprising an insulating structural layer and a fiber composite material layer, the fiber composite material layer is lighter and stronger, thus reducing the weight of the housing assembly and improving its structural strength, thereby increasing the energy density and structural strength of the battery device. Furthermore, by providing an intermediate layer and covering the outer covering layer within this intermediate layer, the structural strength of the housing assembly is further enhanced. In addition, the insulating structural layer and the fiber composite material layer can be configured as different composite material layers according to different functional requirements of the housing assembly, thus eliminating the need for other manufacturing processes or components to meet functional requirements, and to some extent reducing the manufacturing cost of the housing assembly.

[0009] In some embodiments, the battery device includes a battery cell group comprising a plurality of battery cells stacked along a first direction, the housing assembly including a bottom wall and an end wall defining at least a portion of the first receiving cavity; the end walls are located at both ends of the battery cell group along the first direction, and the intermediate layer includes a first intermediate layer, the end walls being provided with the first intermediate layer.

[0010] In this embodiment, by placing end walls at both ends of the battery cell assembly along the first direction, it is beneficial to ensure that the individual battery cells are closely arranged. Furthermore, when a battery cell expands laterally, the end walls provide support, improving the cell's resistance to expansion and mitigating the problem of cell failure due to expansion forces. In addition, by incorporating a first intermediate layer into the end walls, the structural strength of the end walls is improved, further enhancing their support for the battery cells.

[0011] In some embodiments, the insulating structure layer forms a first wall on the side of the end wall facing the battery cell, the fiber composite material layer forms a second wall on the side of the end wall facing away from the battery cell, and at least a portion of the first intermediate layer is located between the insulating structure layer and the fiber composite material layer.

[0012] In some embodiments, at least a portion of the outer surface of the first intermediate layer is connected to the insulating structural layer and / or the fiber composite material layer.

[0013] In this embodiment, by connecting at least a portion of the outer surface of the first intermediate layer to the insulating structural layer and / or the fiber composite material layer, it is beneficial to improve the connection strength between the first intermediate layer and the outer covering layer, thereby improving the structural strength of the housing assembly.

[0014] In some embodiments, a portion of the insulating structure layer of the end wall is configured as a flange, which is connected to the composite material layer to form a connection structure.

[0015] In this embodiment, the insulating structure layer forming the inner wall of the first receiving cavity and the fiber composite material layer forming the outer wall of the housing assembly are connected by a connecting structure. The connecting structure includes a flange formed by the insulating structure layer, which helps to form a stable connecting structure, improves the connection strength between the insulating structure layer and the fiber composite material layer, and thus improves the structural stability of the housing assembly.

[0016] In some embodiments, the connecting structure is located at the end of the end wall on the side opposite to the bottom wall along the thickness direction of the bottom wall, or,

[0017] The connecting structure is located on the side of the end wall that is opposite to the first receiving cavity along the thickness direction of the end wall.

[0018] In this embodiment, the connecting structure is disposed on the top or outside of the end wall so that the insulating structure layer of the inner wall of the first receiving cavity extends to the outside of the housing assembly before being connected. This can avoid the internal space of the first receiving cavity, so that the inner side of the first receiving cavity is completely covered by the insulating structure layer. This can reduce the impact of the connecting structure on the internal structure of the first receiving cavity or the battery cell, and also make assembly easier.

[0019] In some embodiments, in the connection structure, the flange overlaps with the fiber composite material layer, or the flange is butt-jointed with the fiber composite material layer.

[0020] In the technical solution of this application embodiment, the bent flange and the fiber composite material layer adopt an overlapping form, which has good sealing and connection performance, and can reduce the number of components and facilitate assembly; the flange and the fiber composite material layer adopt a butt joint structure with good flatness, and the structure of a single component is simpler.

[0021] In some embodiments, the housing assembly further includes an overlap layer, in which the flanged portion is mated to the fiber composite material layer, and the overlap layer at least covers the mating seam between the flanged portion and the fiber composite material layer.

[0022] The technical solution of this application embodiment, by setting an overlap layer, can cover the joint between the flange and the fiber composite material layer, which can improve the sealing effect and also help improve the connection strength between the insulation structure layer and the fiber composite material layer.

[0023] In some embodiments, the intermediate layer includes a second intermediate layer, and the housing assembly further includes a mounting area for mounting a mounting element. The battery device is connected to the power-consuming device through the mounting element, and the mounting area is provided with the second intermediate layer.

[0024] In this embodiment, by providing a second intermediate layer in the mounting area, the structural strength of the mounting area is improved, thereby further improving the structural strength of the battery device.

[0025] In some embodiments, the fiber composite layer forms the outer wall of the mounting area, and the fiber composite layer covers the second intermediate layer.

[0026] In this embodiment, by forming the fiber composite material layer on the outer wall of the mounting area, the insulation withstand voltage performance does not need to be considered, thereby maximizing the structural strength of the enclosure assembly and reducing its weight as much as possible.

[0027] In some embodiments, at least a portion of the outer surface of the second intermediate layer is connected to the fiber composite material layer.

[0028] In this embodiment, by connecting at least a portion of the outer surface of the second intermediate layer to the fiber composite material layer, it is beneficial to improve the connection strength between the second intermediate layer and the outer covering layer, thereby improving the structural strength of the housing assembly.

[0029] In some embodiments, the mounting area further includes a second through hole that penetrates the outer covering layer and the second intermediate layer, and the mounting element is at least partially disposed within the second through hole.

[0030] In this embodiment, the mounting component is installed by providing a second through hole.

[0031] In some embodiments, the intermediate layer includes a third intermediate layer, the first receiving cavity includes a bottom wall, the battery cell is supported on the bottom wall, and the bottom wall is provided with the third intermediate layer.

[0032] In this embodiment, by providing a third intermediate layer on the bottom wall, the structural strength of the bottom wall is improved, thereby further improving the structural strength of the box assembly.

[0033] In some embodiments, the insulating structural layer forms a third wall on the side of the bottom wall facing the battery cell, the fiber composite material layer forms a fourth wall on the side of the bottom wall facing away from the battery cell, and the third intermediate layer is located between the insulating structural layer and the fiber composite material layer.

[0034] In some embodiments, the battery device includes a battery cell group comprising a plurality of battery cells stacked along a first direction, the housing assembly includes end walls located at both ends of the battery cell group along the first direction, and the third intermediate layer includes a first strip extending along the first direction and connected to the end walls.

[0035] In this embodiment, by setting the third intermediate layer to include the first strip and connecting the first strip to the end wall, it is beneficial to further improve the structural strength of the box assembly.

[0036] In some embodiments, the battery device includes a plurality of battery cell groups arranged along a second direction, the first strip being located at the bottom of two adjacent battery cell groups and at least partially overlapping with the projection of the two adjacent battery cell groups along a third direction, the first direction, the second direction, and the third direction being perpendicular to each other.

[0037] In this embodiment, by placing the first strip at the bottom of two adjacent battery cell groups and at least partially overlapping the projection of the two adjacent battery cell groups along a third direction, it is beneficial to the layout of the first strip and the battery cell groups, which can make the structure of the housing assembly compact, improve the structural strength of the housing assembly, and reduce the weight of the housing assembly as much as possible.

[0038] In some embodiments, each of the battery cells has a pressure relief portion, and each of the battery cells is arranged such that the pressure relief portion faces the bottom wall. The bottom wall includes a pressure relief region and a reinforcement region, the pressure relief region and the reinforcement region being spaced apart along a second direction. At least the reinforcement region is provided with the first strip. The shoulders of the battery cells abut against two adjacent reinforcement regions at both ends along a first direction. The projection of each pressure relief portion is located within the projection of the corresponding pressure relief region.

[0039] In this embodiment, by configuring the bottom wall to include a pressure relief region and a reinforcement region, with the pressure relief region and the reinforcement region spaced apart along a first direction, on the one hand, the support for the battery cell can be improved by having the shoulders of the battery cell abut against the two adjacent reinforcement regions along the first direction. On the other hand, by configuring the pressure relief portion of the battery cell corresponding to the pressure relief region, fluid in the first receiving cavity can flow out from the pressure relief region in the event of thermal runaway of the battery cell.

[0040] In some embodiments, the third intermediate layer further includes a plurality of second strips extending along a second direction, and at least the pressure relief region is provided with the second strips.

[0041] In this embodiment, by providing a second strip, and at least in the pressure relief area, the structural strength of the bottom wall is further improved, thereby enhancing the reliability of the support for the battery cells.

[0042] In some embodiments, a portion of the outer surface of the third intermediate layer is connected to the insulating structural layer, and a portion of the outer surface of the third intermediate layer is connected to the fiber composite material layer.

[0043] In this embodiment, by connecting at least a portion of the outer surface of the third intermediate layer to the insulating structural layer and / or the fiber composite material layer, it is beneficial to improve the connection strength between the third intermediate layer and the outer covering layer, thereby improving the structural strength of the housing assembly.

[0044] In some embodiments, the bottom wall protrudes to form a reinforcing rib on the side opposite to the first receiving cavity, and the reinforcing rib is provided with the third intermediate layer.

[0045] Here, the bottom wall is reinforced with ribs, which helps to further improve the structural strength of the bottom wall, thereby improving the support strength of the bottom wall for the battery cells. On the other hand, the reinforcement ribs provide space for the installation of the third intermediate layer.

[0046] In some embodiments, the housing assembly further includes a protective plate disposed on the side of the bottom wall opposite to the first receiving cavity, forming a second receiving cavity between the protective plate and the bottom wall; the protective plate has a protrusion on the side facing the bottom wall, the protrusion abutting against the reinforcing rib.

[0047] In this embodiment, by forming a protrusion on the side of the protective plate facing the bottom wall, the structural strength of the protective plate is improved. In addition, by having the protrusion abut against the reinforcing rib, the structural strength of the housing assembly and the support strength of the bottom wall for the battery cells are further improved.

[0048] In some embodiments, the battery device includes a battery cell group comprising a plurality of battery cells stacked along a first direction, the housing assembly includes sidewalls located on both sides of the battery cell group along a second direction, and the intermediate layer further includes a fourth intermediate layer disposed on the sidewalls.

[0049] In this embodiment, by providing a fourth intermediate layer on the sidewall of the housing assembly, the structural strength of the sidewall is improved, thereby further improving the structural strength of the housing assembly.

[0050] In some embodiments, the insulating structure layer forms a fifth wall on the side of the sidewall facing the battery cell, the fiber composite material layer forms a sixth wall on at least a portion of the sidewall facing away from the battery cell, and at least a portion of the fourth intermediate layer is located between the insulating structure layer and the fiber composite material layer.

[0051] In some embodiments, at least a portion of the outer surface of the fourth intermediate layer is connected to the insulating structural layer and / or the fiber composite layer.

[0052] In this embodiment, by connecting at least a portion of the outer surface of the fourth intermediate layer to the insulating structural layer and / or the fiber composite material layer, it is beneficial to improve the connection strength between the fourth intermediate layer and the outer covering layer, thereby improving the structural strength of the housing assembly.

[0053] In some embodiments, the intermediate layer includes at least one of a metal component, a composite material component, or a foam component.

[0054] In other words, the intermediate layer can be any one of metal parts, composite material parts, or foam parts, or it can include any two of metal parts, composite material parts, or foam parts, or it can include all three of metal parts, composite material parts, and foam parts.

[0055] In some embodiments, the intermediate layer includes a foam component and a first composite material layer, the first composite material layer covering the foam component.

[0056] In this embodiment, by setting the intermediate layer to include a foam component and a first composite material layer, on the one hand, the combination of the foam component and the first composite material layer is beneficial to improving the structural strength of the intermediate layer; on the other hand, the foam component is relatively lightweight, thus helping to reduce the weight of the intermediate layer.

[0057] In some embodiments, the first composite material layer includes a first substrate and a first fiber;

[0058] The first substrate comprises at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin; and / or,

[0059] The first fiber includes at least one of carbon fiber and polyethylene fiber.

[0060] Here, the first substrate serves to bond and protect the reinforcing phases such as carbon fiber and polyethylene fiber, and to transfer the stress caused by the external load to the reinforcing phases such as carbon fiber and polyethylene fiber.

[0061] In this embodiment, by setting the first composite material layer to include a first carbon fiber fabric, it is beneficial to further improve the structural strength of the first composite material layer while reducing its weight.

[0062] In some embodiments, the first fiber is a woven fabric.

[0063] In this embodiment, by setting the first composite material layer to include carbon fiber fabric, it is beneficial to further improve the structural strength of the first composite material layer while reducing its weight.

[0064] In some embodiments, the intermediate layer is a one-piece structure.

[0065] In this embodiment, by setting the intermediate layer as an integral structure, it is beneficial to improve the integrity of the intermediate layer, thereby improving the structural strength and support strength of the intermediate layer, and thus improving the structural strength of the box assembly.

[0066] In some embodiments, the intermediate layer includes a reinforcing plate, the bottom wall of the first receiving cavity includes the reinforcing plate, and the reinforcing plate protrudes to form a protrusion.

[0067] In this embodiment, the reinforcing plate has protrusions, which on the one hand helps to further improve the structural strength of the box assembly, and on the other hand, the formation of the protrusions helps to improve the connection strength between the reinforcing plate and other components (foam parts and outer covering layers, etc.).

[0068] In some embodiments, the number of protrusions is plurality of, the plurality of protrusions are spaced apart along a first direction, and each protrusion extends along a second direction, the first direction intersecting the second direction; or,

[0069] The number of protrusions is two, and the two protrusions extend along the diagonal of the first receiving cavity.

[0070] In this embodiment, the layout of the protrusion and the battery cell group is advantageous, so that the setting of the protrusion is adapted to the distribution of the battery cell group, which helps to improve the structural strength and reliability of the housing assembly.

[0071] This structure is simple and helps to improve the structural strength and reliability of the enclosure components.

[0072] In some embodiments, the housing assembly further includes a mounting area for mounting a mounting element, through which the battery device is connected to the power device. The intermediate layer further includes a reinforcing block, which is provided in the mounting area and connected to the reinforcing plate. At least a portion of the reinforcing block forms a first locking hole.

[0073] In this embodiment, by providing reinforcing blocks in the mounting area, the structural strength of the mounting area is improved, thereby further enhancing the structural strength of the battery device. Furthermore, by forming first locking holes in at least a portion of the reinforcing blocks, they can be connected to other components through these holes, thus improving the structural strength of the connection points in the mounting area.

[0074] In some embodiments, the battery device includes a battery cell group comprising a plurality of battery cells stacked along a first direction, the housing assembly includes end walls located at both ends of the battery cell group along the first direction, the intermediate layer further includes a reinforcing profile, the end walls are provided with the reinforcing profile, the reinforcing profile extends along the extension direction of the end walls and is connected to the reinforcing plate.

[0075] In this embodiment, by providing a reinforcing profile on the end wall and connecting the reinforcing profile to the reinforcing plate, it is beneficial to further improve the structural strength of the end wall, thereby improving the structural strength of the box assembly.

[0076] In some embodiments, the housing assembly includes a first housing and a second housing, the first housing and the second housing surrounding the first receiving cavity;

[0077] The first housing includes the insulating structure layer, the fiber composite material layer and the intermediate layer. The intermediate layer of the first housing also includes a reinforcing insert with a second locking hole. The first housing is connected to the second housing through the second locking hole.

[0078] In this embodiment, by setting the middle layer of the first housing to include a reinforcing insert with a second locking hole, the first housing is connected to the second housing through the second locking hole. This allows the first housing to withstand a higher locking torque, which is beneficial to improving the connection strength between the first housing and the second housing.

[0079] In some embodiments, at least one of the reinforcing plate, the reinforcing block, the reinforcing profile, and the reinforcing insert is a metal component.

[0080] In some embodiments, the intermediate layer includes a metal component and a foam component, the metal component being connected to the foam component.

[0081] In this embodiment, connecting the metal parts with the foam parts helps to improve the structural strength of the intermediate layer.

[0082] In some embodiments, the battery device includes a battery cell group comprising a plurality of battery cells stacked along a first direction. The housing assembly includes end walls and mounting areas. The end walls are located at both ends of the battery cell group along the first direction. The metal component includes a reinforcing plate, a reinforcing block, and a reinforcing profile. The reinforcing block and the reinforcing profile are connected to the reinforcing plate. The bottom wall of the first receiving cavity is provided with the reinforcing plate. The end wall is provided with the reinforcing profile. The mounting area is provided with the reinforcing block, and at least a portion of the reinforcing block forms a first locking hole.

[0083] In some embodiments, the foam component is formed on the surface of the metal component; or, the metal component is bonded to the foam component.

[0084] In some embodiments, an adhesive layer is provided between the intermediate layer and the outer covering layer.

[0085] In some embodiments, the insulating structure layer includes a first fiber fabric, the fiber composite layer includes a second fiber fabric, the first fiber fabric includes a plurality of second fibers, and the second fiber fabric includes a plurality of third fibers, wherein the second fibers are different from the third fibers.

[0086] Here, the insulation structure includes a first fiber fabric, and the fiber composite material layer includes a second fiber fabric. The fiber fabric has high structural strength and load-bearing capacity, which helps to improve the load-bearing and protective capabilities of the enclosure components.

[0087] In some embodiments, the second fiber comprises at least one selected from glass fiber, basalt fiber, and aramid fiber; and / or,

[0088] The third fiber includes at least one of carbon fiber and polyethylene fiber.

[0089] Here, the second and third fibers can be made of suitable materials according to requirements, so as to be applied to a variety of different scenarios and improve the adaptability of the battery device.

[0090] In some embodiments, the number of layers of the first fiber fabric in the insulating structure layer is 1-3.

[0091] In some embodiments, the number of layers of the second fiber fabric in the fiber composite layer is 2-15.

[0092] Here, setting the number of layers of the first fiber fabric in the first insulation layer within a suitable range allows for a significant reduction in the weight of the enclosure assembly while ensuring good insulation performance, thus facilitating lightweight design of the enclosure assembly. Similarly, maintaining the number of layers of the second fiber fabric in the fiber composite layer within a suitable range allows for minimizing the total thickness and weight of the fiber composite layer while ensuring its structural strength.

[0093] In some embodiments, the insulating structure layer includes a second substrate and a plurality of second fibers, at least a portion of which intersect each other, and the second fibers include at least one of glass fiber, basalt fiber, and aramid fiber; the second substrate includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin.

[0094] Using polyurethane, epoxy resin, phenolic resin, polyamide resin, ceramicizable resin, etc. as the second base material has good wear resistance, high toughness, adhesion, corrosion resistance, heat resistance and other properties. Using glass fiber, basalt fiber, aramid fiber, etc. as the second fiber can obtain good structural strength and insulation properties.

[0095] In some embodiments, the fiber composite layer includes a third substrate and a plurality of third fibers, at least a portion of which intersect each other, and the third fibers include at least one of carbon fiber and polyethylene fiber; the third substrate includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin.

[0096] Here, polyurethane, epoxy resin, phenolic resin, polyamide resin, ceramicizable resin and other materials are selected as the third base material, which have good wear resistance, high toughness, adhesion, corrosion resistance and heat resistance. Carbon fiber, polyethylene fiber and other materials are selected as the third fiber, which can reduce weight and provide higher strength.

[0097] In some embodiments, the thickness of the insulating structure layer is less than or equal to the thickness of the fiber composite material layer.

[0098] In some embodiments, the thickness of the insulating structural layer ranges from 0.1 mm to 1.0 mm, and the thickness of the fiber composite material layer ranges from 1.0 mm to 2.5 mm. Here, the thinner insulating structural layer, while meeting insulation requirements, helps to reduce the wall thickness of the housing assembly and thus reduce its weight; the thicker fiber composite material layer, on the other hand, helps to improve structural strength, thereby providing a stable operating environment for the battery cells.

[0099] A second aspect of this disclosure provides an electrical device, including the battery device or the energy storage device described above.

[0100] In some embodiments, the electrical device includes an aircraft. Attached Figure Description

[0101] Figure 1 This is a schematic diagram of the vehicle structure provided in some embodiments of this disclosure;

[0102] Figure 2 This is an exploded perspective view of a battery device provided in some embodiments of the present disclosure;

[0103] Figure 3 A partial structural schematic diagram of the housing assembly provided in some embodiments of this disclosure;

[0104] Figure 4 This is a schematic diagram of the structure of the intermediate layer provided in some embodiments of this disclosure;

[0105] Figure 5 for Figure 4 A sectional view;

[0106] Figure 6 A partial structural schematic diagram of the housing assembly provided in some embodiments of this disclosure;

[0107] Figure 7 A partial structural schematic diagram of the housing assembly provided in some embodiments of this disclosure;

[0108] Figure 8 An exploded perspective view of the housing assembly provided in some embodiments of this disclosure;

[0109] Figure 9 for Figure 7 Cross-sectional view along the BB direction;

[0110] Figure 10 for Figure 7 Cross-sectional view along the BB direction;

[0111] Figure 11 for Figure 7 Enlarged view of point C in the middle;

[0112] Figure 12 for Figure 7 Enlarged view of point D in the middle;

[0113] Figure 13 This is a partial structural schematic diagram of a battery device provided in some embodiments of the present disclosure;

[0114] Figure 14 This is a partial structural schematic diagram of a battery device provided in some embodiments of the present disclosure;

[0115] Figure 15 for Figure 4 Cross-sectional view along the EE direction;

[0116] Figure 16 for Figure 5 Enlarged view at point F;

[0117] Figure 17 A partial exploded perspective view of a battery device provided in some embodiments of this disclosure;

[0118] Figure 18 This is a schematic diagram of the structure of the bottom protective plate provided in some embodiments of this disclosure;

[0119] Figure 19 A partial structural schematic diagram of the housing assembly provided in some embodiments of this disclosure;

[0120] Figure 20 A partial structural schematic diagram of the housing assembly provided in some embodiments of this disclosure;

[0121] Figure 21 for Figure 20 Cross-sectional view along the MM direction;

[0122] Figure 22 for Figure 21 Enlarged view of point G in the middle;

[0123] Figure 23 for Figure 21 Enlarged view at point N;

[0124] Figure 24 An enlarged view of the housing assembly located at N, provided for other embodiments of this disclosure.

[0125] Explanation of reference numerals in the attached figures

[0126] 10. Battery cell assembly; 11. Battery cell; 20. Housing assembly; 21. Outer covering layer; 211. Insulating structural layer; 212. Fiber composite material layer; 22. Intermediate layer; 221. First intermediate layer; 222. Second intermediate layer; 223. Third intermediate layer; 2231. First strip; 2232. Second strip; 224. Metal component; 2241. Reinforcing plate; 2242. Reinforcing block; 2243. Reinforcing profile; 2244. Reinforcing insert; 2245. Protrusion; 225. Foam component; 23. First receiving cavity; 24. End wall ; 241, First wall; 242, Second wall; 243, Flanged edge; 244, Overlap layer; 25, Mounting area; 251, Second through hole; 26, Bottom wall; 261, Third wall; 262, Fourth wall; 263, Reinforced area; 264, Pressure relief area; 265, Reinforcing rib; 27, Side wall; 271, Fifth wall; 272, Sixth wall; 28, First housing; 29, Second housing; 30, Protective plate; 31, Second receiving cavity; 32, Protrusion; 100, Battery device; 200, Controller; 300, Motor; 1000, Vehicle. Detailed Implementation

[0127] Unless otherwise specified, all embodiments and optional embodiments of this disclosure can be combined to form new technical solutions.

[0128] Unless otherwise specified, all technical features and optional technical features of this disclosure can be combined to form new technical solutions.

[0129] With the development of clean energy, more and more devices are using electricity as their driving force, leading to the rapid development of power batteries, such as lithium-ion batteries, which can store a large amount of electrical energy and can be repeatedly charged and discharged. These power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields.

[0130] In this embodiment of the disclosure, the battery cell 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.

[0131] The battery cell 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 disclosed herein are not limited to this.

[0132] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the positive and negative electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0133] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0134] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0135] In some implementations, the electrode assembly is a stacked structure.

[0136] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0137] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0138] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0139] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0140] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0141] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0142] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0143] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0144] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This disclosure does not impose any particular limitations.

[0145] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also have one or more.

[0146] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0147] In some embodiments, energy storage devices include energy storage containers, energy storage cabinets, etc.

[0148] In related technologies, the housing assembly is a metal structure, which suffers from problems such as large weight, poor insulation performance, complex structure, and the need for welding multiple structures together. Therefore, how to improve the energy density of the battery device while increasing structural strength has become an important research direction in this field.

[0149] In view of this, in order to improve the energy density of the battery device while increasing structural strength, embodiments of this disclosure provide a battery device including a housing assembly and individual battery cells. The housing assembly has a first receiving cavity, and the individual battery cells are disposed within the first receiving cavity. The housing assembly includes an outer covering layer, which includes an insulating structural layer and a fiber composite material layer. The insulating structural layer forms at least a portion of the inner wall of the housing assembly facing the first receiving cavity, and the fiber composite material layer forms at least a portion of the outer wall of the housing assembly facing away from the first receiving cavity. At least a portion of the housing assembly also includes an intermediate layer, which is covered by the outer covering layer.

[0150] The battery device provided in this disclosure includes a housing assembly and individual battery cells. The housing assembly has a first receiving cavity, within which the individual battery cells are disposed, and the housing assembly protects the individual battery cells. By configuring the housing assembly to include an outer covering layer comprising an insulating structural layer and a fiber composite material layer, the fiber composite material layer is lighter and stronger, thus reducing the weight of the housing assembly and improving its structural strength, thereby increasing the energy density and structural strength of the battery device. Furthermore, by providing an intermediate layer and covering the outer covering layer within this intermediate layer, the structural strength of the housing assembly is further enhanced. In addition, the insulating structural layer and the fiber composite material layer can be configured as different composite material layers according to different functional requirements of the housing assembly, thus eliminating the need for other manufacturing processes or components to meet functional requirements, and to some extent reducing the manufacturing cost of the housing assembly.

[0151] The technical solutions described in this disclosure are applicable to electrical devices that use battery devices. The electrical devices include battery devices according to any embodiment of this disclosure, and the battery devices are used to provide electrical energy.

[0152] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This disclosure does not impose any special limitations on the above-mentioned electrical equipment.

[0153] It should be noted that the technical solutions described in this disclosure are not limited to the battery devices described above, but can also be applied to all electrical devices and energy storage devices that include battery devices.

[0154] Please refer to Figure 1The vehicle 1000 may contain a controller 200, a motor 300, and a battery device 100. The controller 200 controls the battery device 100 to supply power to the motor 300. For example, the battery device 100 may 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, it can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation. In another embodiment of this disclosure, the battery device 100 can not only serve as the operating power source for the vehicle 1000 but also as the driving power source, replacing or partially replacing fuel or natural gas to provide driving power to the vehicle 1000.

[0155] For example, the electrical device includes an aircraft.

[0156] Aircraft generally refer to machines that fly within or outside the atmosphere (space), and can include aircraft flying within the atmosphere and spacecraft flying in space. Aircraft can include airplanes, airships, etc., and for example, low-altitude aircraft, eVTOL (electric vertical take-off and landing) aircraft, commuter aircraft, regional aircraft, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft.

[0157] Please see Figure 2 To meet different power demands, the battery device 100 includes a battery cell group 10, which may include multiple battery cells 11. A battery cell 11 is the smallest unit that makes up a battery module or battery pack. Multiple battery cells 11 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 11 are connected in both series and parallel connections. Multiple battery cells 11 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of multiple battery cells 11 is housed within a housing assembly 20. Alternatively, the battery device 100 can also consist of multiple battery cells 11 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within the housing assembly 20. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between multiple battery cells 11. Each battery cell 11 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 11 can be cylindrical, flat, cuboid, or other shapes.

[0158] Please see Figures 2 to 12This disclosure provides a battery device 100, which includes a housing assembly 20 and a battery cell 11. The housing assembly 20 has a first receiving cavity 23, and the battery cell 11 is disposed within the first receiving cavity 23. The housing assembly 20 includes an outer covering layer 21, which includes an insulating structural layer 211 and a fiber composite material layer 212. The insulating structural layer 211 forms at least a portion of the inner wall of the housing assembly 20 facing the first receiving cavity 23, and the fiber composite material layer 212 forms at least a portion of the outer wall of the housing assembly 20 away from the first receiving cavity 23. At least a portion of the housing assembly 20 also includes an intermediate layer 22, which is covered by the outer covering layer 21.

[0159] Please refer to Figure 2 The battery device 100 includes a housing assembly 20 and a battery cell 11, with the battery cell 11 disposed within the first receiving cavity 23 of the housing assembly 20.

[0160] The box assembly 20 can be a simple three-dimensional structure such as a cuboid, cylinder, or sphere, or it can be a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres.

[0161] The housing assembly 20 is used to install the battery cell 11. The housing assembly 20 can carry the battery cell, and the battery cell is installed to the electrical equipment through the housing assembly.

[0162] For example, the enclosure assembly 20 is typically a cuboid structure, with both its length and width directions parallel to the horizontal plane. The length direction of the enclosure assembly 20 is parallel to the longest side of its cuboid structure. The height direction of the enclosure assembly 20 is perpendicular to the ground. For example, as... Figure 2 As shown, the length direction of the housing assembly 20 is the first direction, the width direction of the housing assembly 20 is the second direction, and the height direction of the housing assembly 20 is the third direction; or the length direction of the housing assembly is the second direction, the width direction of the housing assembly 20 is the first direction, and the height direction of the housing assembly 20 is the third direction.

[0163] For example, both the insulating structural layer 211 and the fiber composite layer 212 include a matrix phase and a reinforcing phase. The matrix phase bonds the reinforcing phase together, forming a whole, thereby giving the composite material continuity and integrity. The reinforcing phase is used to improve the strength and stiffness of the composite material, enhancing its mechanical properties.

[0164] Here, both the insulating structural layer 211 and the fiber composite material layer 212 are composite material layers, which are lightweight and high-strength. This helps to reduce the weight of the enclosure assembly 20 and improve the structural strength of the enclosure assembly 20.

[0165] For example, the insulating structure layer 211 includes a second fiber, which includes at least one of glass fiber, basalt fiber, and aramid fiber.

[0166] Here, glass fiber, basalt fiber, and aramid fiber are the reinforcing phases of the insulating structural layer 211, which can give the housing assembly 20 a certain structural strength.

[0167] The term "insulating structure layer 211 forming at least a portion of the inner wall of housing assembly 20 facing the first receiving cavity 23" can mean that the insulating structure layer 211 forming a portion of the inner wall of housing assembly 20 facing the first receiving cavity 23, or it can mean that the insulating structure layer 211 forming the entire inner wall of housing assembly 20 facing the first receiving cavity 23.

[0168] The insulating structure layer 211 forms at least a portion of the inner wall of the housing assembly 20 facing the first receiving cavity 23. That is, the insulating structure layer 211 may be in direct contact with the battery cell 11. Thus, by making the insulating structure layer 211 include at least one of glass fiber, basalt fiber, and aramid fiber, the insulating structure layer 211 has insulating and voltage-resistant properties, thereby eliminating the need to set other manufacturing processes or other components to make the insulating structure layer 211 have insulating properties, which to some extent helps to reduce the manufacturing cost of the housing assembly 20.

[0169] For example, the insulating structure layer 211 further includes a second substrate, which includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin.

[0170] Here, the second substrate serves to bond and protect the reinforcing phases such as glass fiber, basalt fiber, and aramid fiber, and to transfer the stress caused by the applied load to the reinforcing phases such as glass fiber, basalt fiber, and aramid fiber.

[0171] For example, the insulating structure layer 211 includes a first fiber fabric, which includes a plurality of second fibers.

[0172] For example, the number of layers of the first fiber fabric in the insulating structure layer 211 is 1-3.

[0173] For example, the fiber composite layer 212 includes a third fiber, which includes at least one of carbon fiber and polyethylene fiber.

[0174] Here, carbon fiber and polyethylene fiber are the reinforcing phases of the fiber composite layer 212, mainly used for load bearing, which can give the box assembly 20 a certain structural strength.

[0175] For example, the fiber composite layer 212 further includes a third substrate, which includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin.

[0176] Here, the third substrate serves to bond and protect the reinforcing phases such as carbon fiber and polyethylene fiber, and to transfer the stress caused by the external load to the reinforcing phases such as carbon fiber and polyethylene fiber.

[0177] For example, the fiber composite layer 212 includes a second fiber fabric, which includes a plurality of third fibers, the second fibers being different from the third fibers.

[0178] For example, the number of layers of the second fiber fabric in the fiber composite layer 212 is 2-15.

[0179] Exemplarily, the insulating structure layer 211 includes a second substrate and a plurality of second fibers, at least some of which intersect each other. The second fibers include at least one of glass fiber, basalt fiber, and aramid fiber. The second substrate includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin.

[0180] Exemplarily, the fiber composite layer 212 includes a third substrate and a plurality of third fibers, at least some of which intersect each other. The third fibers include at least one of carbon fiber and polyethylene fiber. The third substrate includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin.

[0181] The fiber composite material layer 212 forms at least a portion of the outer wall of the box assembly 20 away from the first receiving cavity 23. It can be that the fiber composite material layer 212 forms a portion of the outer wall of the box assembly 20 away from the first receiving cavity 23, or it can be that the fiber composite material layer 212 forms the entire outer wall of the box assembly 20 away from the first receiving cavity 23.

[0182] In this embodiment where the fiber composite material layer 212 forms part of the outer wall of the housing assembly 20 away from the first receiving cavity 23, the insulating structure layer 211 can form another part of the outer wall of the housing assembly 20 away from the first receiving cavity 23, thus facilitating the connection between the insulating structure layer 211 and the fiber composite material layer 212.

[0183] The fiber composite material layer 212 forms at least part of the outer wall of the housing assembly 20 away from the first receiving cavity 23. That is, the fiber composite material layer 212 is not in direct contact with the battery cell 11. Thus, by setting the fiber composite material layer 212 to include carbon fiber or polyethylene fiber, the density of carbon fiber or polyethylene fiber is relatively low, so that the housing assembly 20 has a certain structural strength while minimizing the weight of the housing assembly 20.

[0184] In this embodiment of the application, the outer wall of the box assembly 20 is formed by the outer covering layer 21, that is, the outer covering layer 21 forms the surface layer of the box assembly 20. A cavity is formed in the box assembly 20 within the outer covering layer 21. By filling the cavity with the intermediate layer 22, the outer covering layer 21 of the box assembly 20 is supported, thereby improving the impact resistance and load-bearing capacity of the box assembly 20.

[0185] The outer covering layer 21 covers the outer surface of the intermediate layer 22, and the intermediate layer 22 fills the outer covering layer 21, providing support for the outer covering layer 21 to a certain extent, which helps to improve the structural strength of the housing assembly 20.

[0186] The statement that at least a portion of the housing assembly 20 includes the intermediate layer 22 means that either a portion of the housing assembly 20 includes the intermediate layer 22, or the entire housing assembly 20 includes the intermediate layer 22.

[0187] At least a portion of the housing assembly 20 also includes an intermediate layer 22. That is, an intermediate layer 22 can be provided in areas of the housing assembly 20 that bear a large weight to improve the structural strength of those areas. In addition, an intermediate layer 22 can also be provided in areas that bear a small weight, which helps to reduce manufacturing costs and further reduce weight.

[0188] The battery device 100 provided in this embodiment includes a housing assembly 20 and a battery cell 11. The housing assembly 20 has a first receiving cavity 23, and the battery cell 11 is disposed within the first receiving cavity 23. The housing assembly 20 protects the battery cell 11. By configuring the housing assembly 20 to include an outer covering layer 21, which includes an insulating structural layer 211 and a fiber composite material layer 212, the fiber composite material layer is lighter and has higher strength. This helps to reduce the weight of the housing assembly 20 and improve its structural strength, thereby improving the energy density and structural strength of the battery device 100. On the other hand, by providing an intermediate layer 22 and covering the outer covering layer 21 with the intermediate layer 22, the structural strength of the housing assembly 20 is further improved. In addition, the insulating structural layer 211 and the fiber composite material layer 212 can be configured as different composite material layers according to different functional requirements of the housing assembly 20, so that functional requirements do not need to be met through other manufacturing processes or other components, which helps to reduce the manufacturing cost of the housing assembly 20 to a certain extent.

[0189] In some embodiments, please refer to Figures 2 to 4The battery device 100 includes a battery cell assembly 10, which includes a plurality of battery cells 11 stacked along a first direction. The housing assembly 20 includes a bottom wall 26 and an end wall 24, which define at least a portion of a first receiving cavity 23. The end walls 24 are located at both ends of the battery cell assembly 10 along the first direction. The intermediate layer 22 includes a first intermediate layer 221, which is disposed on the end wall 24.

[0190] Here, end wall 24 can be an expansion beam.

[0191] The end walls 24 are located at both ends of the battery cell pack 10 along the first direction. That is, at least two end walls 24 are spaced apart along the first direction, the battery cell pack 10 is located between the two end walls 24, and multiple battery cells 11 are stacked along the first direction to form the battery cell pack 10.

[0192] In this embodiment, by placing end walls 24 at both ends of the battery cell assembly 10 along the first direction, it is beneficial to ensure that the individual battery cells 11 of the battery cell assembly 10 are closely arranged. Furthermore, when the battery cells 11 expand laterally, the end walls 24 can provide support for the battery cells 11, improving their resistance to expansion and mitigating the problem of battery cell failure due to expansion force. In addition, by providing a first intermediate layer 221 to the end walls 24, the structural strength of the end walls 24 is improved, thereby further enhancing their support for the battery cells 11.

[0193] In some embodiments, please refer to Figures 2 to 5 The insulating structure layer 211 forms a first wall 241 on the side of the end wall 24 facing the battery cell 11, the fiber composite material layer 212 forms a second wall 242 on the side of the end wall 24 facing away from the battery cell 11, and at least a portion of the first intermediate layer 221 is located between the insulating structure layer 211 and the fiber composite material layer 212.

[0194] The insulating structure layer 211 forms a first wall 241 on the side of the end wall 24 facing the battery cell 11. In other words, the first wall 241 constitutes part of the inner wall of the first receiving cavity 23.

[0195] The fiber composite material layer 212 forms at least a portion of the end wall 24 on the side opposite to the battery cell 11, that is, the second wall 242 constitutes part of the outer wall of the first receiving cavity 23.

[0196] The fiber composite layer 212 forming at least a portion of the end wall 24 on the side opposite to the battery cell 11 means that the fiber composite layer 212 can form a portion of the end wall 24 on the side opposite to the battery cell 11, or the fiber composite layer 212 can form the entire end wall 24 on the side opposite to the battery cell 11.

[0197] In the embodiment where the fiber composite material layer 212 forms a second wall 242 on the side of the end wall 24 facing away from the battery cell 11, the insulating structure layer 211 can form another second wall 242 on the side of the end wall 24 facing away from the battery cell 11. This facilitates the connection between the insulating structure layer 211 and the fiber composite material layer 212. Alternatively, the first composite material layer can form another second wall 242 on the side of the end wall 24 facing away from the battery cell 11. In other words, the insulating structure layer 211 and the fiber composite material layer 212 are connected through the first composite material layer.

[0198] Here, "at least part of the first intermediate layer 221 is located between the insulating structure layer 211 and the fiber composite material layer 212" means that either part of the first intermediate layer 221 is located between the insulating structure layer 211 and the fiber composite material layer 212, or all of the first intermediate layer 221 is located between the insulating structure layer 211 and the fiber composite material layer 212.

[0199] For example, in an embodiment where a portion of the first intermediate layer 221 is located between the insulating structural layer 211 and the fiber composite material layer 212, another portion of the first intermediate layer 221 may be located between the insulating structural layers 211.

[0200] In some embodiments, please continue reading Figures 2 to 5 At least a portion of the outer surface of the first intermediate layer 221 is connected to the insulating structural layer 211 and / or the fiber composite material layer 212.

[0201] In other words, at least a portion of the outer surface of the first intermediate layer 221 may be connected to the insulating structure layer 211, or to the fiber composite material layer 212, or to both the insulating structure layer 211 and the fiber composite material layer 212.

[0202] Here, a portion of the outer surface of the first intermediate layer 221 may be connected to the insulating structure layer 211 and / or the fiber composite material layer 212, or the entire outer surface of the first intermediate layer 221 may be connected to the insulating structure layer 211 and / or the fiber composite material layer 212.

[0203] The manner in which the first intermediate layer 221 is connected to the insulating structural layer 211 and / or the fiber composite material layer 212 is not limited here.

[0204] For example, the first intermediate layer 221 may be bonded to the insulating structural layer 211 and / or the fiber composite material layer 212.

[0205] For example, the insulating structural layer 211 and / or the fiber composite material layer 212 may be formed on the outer surface of the first intermediate layer 221.

[0206] In this embodiment, by connecting at least a portion of the outer surface of the first intermediate layer 221 to the insulating structural layer 211 and / or the fiber composite material layer 212, it is beneficial to improve the connection strength between the first intermediate layer 221 and the outer covering layer 21, thereby improving the structural strength of the housing assembly 20.

[0207] In some embodiments, please refer to Figures 20 to 24 A portion of the insulating structure layer 211 of the end wall 24 is configured as a flange 243, which is connected to the fiber composite material layer 212 to form a connection structure.

[0208] For example, the connection structure between the insulating structure layer 211 and the fiber composite material layer 212 of the end wall 24 can be an adhesive structure, a snap-fit ​​structure, a welded structure, a riveting structure, a fastener connection structure, etc.

[0209] By way of example, a portion of the insulating structure layer 211 may be provided with a flange 243, which is located at the edge of the insulating structure layer 211. The flange 243 may be located on the outer or inner side of the end wall 24 relative to the first receiving cavity 23, or on the side of the end wall 24 away from the bottom wall 26. In some examples, the flange 243 may also be formed of a fiber composite material layer 212.

[0210] For example, the flanged portion 243 can be formed by processes such as bending or flanging, and the bent portion of the flanged portion 243 can be an acute angle, a right angle, an obtuse angle, or a rounded corner.

[0211] In this embodiment, the insulating structure layer 211 forming the inner wall of the first receiving cavity 23 and the fiber composite material layer 212 forming the outer wall of the box assembly 20 are connected by a connecting structure. The connecting structure includes a flange 243 formed by the insulating structure layer 211, which helps to form a stable connecting structure, improves the connection strength between the insulating structure layer 211 and the fiber composite material layer 212, and thus improves the structural stability of the box assembly 20.

[0212] In some embodiments, please refer to Figures 20 to 24 The connecting structure is located at the end of the end wall 24 on the side opposite to the bottom wall 26 along the thickness direction of the end wall 24, or the connecting structure is located on the side of the end wall 24 on the side opposite to the first receiving cavity 23 along the thickness direction of the end wall 24.

[0213] In some examples, the connecting structure is located at the end of the end wall 24 that is opposite to the bottom wall 26 along the thickness direction (third direction) of the bottom wall 26. In other words, the connecting structure is located at the top of the end wall 24, or at the opening of the housing assembly 20.

[0214] In other examples, the connecting structure is located on the side of the end wall 24 away from the first receiving cavity 23 along the thickness direction (first direction or second direction) of the end wall 24; in other words, the connecting structure is located on the side of the end wall 24 opposite to the first receiving cavity 23.

[0215] In this embodiment, the connecting structure is disposed on the top or outside of the end wall 24 so that the insulating structure layer 211 of the inner wall of the first receiving cavity 23 extends to the outside of the housing assembly 20 before being connected. This can avoid the internal space of the first receiving cavity 23 so that the inner side of the first receiving cavity 23 is completely covered by the insulating structure layer 211. This can reduce the impact of the connecting structure on the internal structure of the first receiving cavity 23 or the battery cell 11, and also make assembly easier.

[0216] In some embodiments, please continue reading Figures 20 to 24 In the connecting structure, the flange 243 overlaps with the fiber composite material layer 212, or the flange 243 is butt-jointed with the fiber composite material layer 212.

[0217] In this embodiment of the application, overlapping refers to the fact that the projections of two components along a certain direction at least partially overlap, and the two are connected to each other. For example, in the connection structure, the projection of the flange 243 along the thickness direction at least partially overlaps with the projection of the fiber composite material layer 212 along that direction, and the flange 243 is connected to the fiber composite material layer 212 by means of bonding, welding, abutment, riveting, etc.

[0218] In some examples, one of the flange 243 and the fiber composite layer 212 is formed with a bent structure, which can be bent toward or away from the first receiving cavity 23, and the other of the flange 243 and the fiber composite layer 212 overlaps with the bent structure.

[0219] In this embodiment of the application, docking refers to two components being arranged opposite each other and connected to each other. For example, in the connection structure, along the extension direction of the flange 243, the flange 243 and the fiber composite material layer 212 are arranged opposite each other, that is, the projections of the two along the extension direction at least partially overlap, and the flange 243 and the fiber composite material layer 212 can be connected by abutment, bonding, welding or other means.

[0220] In the technical solution of this application embodiment, the bent flange 243 and the fiber composite material layer 212 adopt an overlapping form, which has good sealing and connection performance, and can reduce the number of components and facilitate assembly; the flange 243 and the fiber composite material layer 212 adopt a butt joint structure with good flatness, and the structure of a single component is simpler.

[0221] In some embodiments, please refer to Figure 24The housing assembly 20 also includes an overlap layer 244. In the connection structure, the flange 243 is mated with the fiber composite material layer 212, and the overlap layer 244 at least covers the mating seam between the flange 243 and the fiber composite material layer 212.

[0222] In this embodiment, the flange 243 and the fiber composite material layer 212 are joined to form a joint. The joint can be a closed line that connects the beginning and the end, or it can be a non-closed line. The joint can be a straight line, a curve, or a combination of both. In some examples, the joint is a straight line and is set parallel to the extension direction (first direction or second direction) of the bottom wall 26.

[0223] In this embodiment, the overlap layer 244 may be connected to at least one of the insulating structural layer 211 and the fiber composite material layer 212. In some examples, the overlap layer 244 connects the insulating structural layer 211 and the fiber composite material layer 212 respectively.

[0224] In this embodiment, the overlapping layer 244 may be located on the side of the flanged portion 243 / fiber composite material layer 212 away from the first receiving cavity 23. For example, the overlapping layer 244 may be located on the outer side of the end wall 24 relative to the first receiving cavity 23; or the overlapping layer 244 may be located on the side of the flanged portion 243 / fiber composite material layer 212 close to the first receiving cavity 23. For example, the overlapping layer 244 may be located inside the end wall 24.

[0225] The technical solution of this application embodiment, by setting an overlap layer 244, can cover the joint between the flange 243 and the fiber composite material layer 212, which can improve the sealing effect and also help to improve the connection strength between the insulation structure layer 211 and the fiber composite material layer 212.

[0226] In some embodiments, please refer to Figures 3 to 5 The intermediate layer 22 includes a second intermediate layer 222, and the housing assembly 20 also includes a mounting area 25, which is used to set up mounting parts. The battery device 100 is connected to the power device through the mounting parts, and the mounting area 25 is provided with the second intermediate layer 222.

[0227] Here, the mounting area 25 is used to install the mounting component, and the battery device 100 is connected to the power device through the mounting component. That is to say, the battery device 100 is connected to the power device through the mounting area 25, and the mounting area 25 is used to support at least part of the weight of the battery device 100.

[0228] In this embodiment, by providing a second intermediate layer 222 in the mounting area 25, the structural strength of the mounting area 25 is improved, thereby further improving the structural strength of the battery device 100.

[0229] In some embodiments, please refer to Figures 3 to 5 The fiber composite material layer 212 forms the outer wall of the mounting area 25, and the fiber composite material layer 212 covers the second intermediate layer 222.

[0230] It should be noted that the specific location of mounting area 25 is not restricted here.

[0231] For example, the mounting area 25 is disposed on the side of the end wall 24 opposite to the battery cell 11. That is, the mounting area 25 is not in direct contact with the battery cell 11.

[0232] Specifically, the mounting area 25 is located at both ends of the battery cell group 10 along the first direction, and is located on the side of the end wall 24 away from the battery cell 11.

[0233] The fiber composite material layer 212 forming the outer wall of the mounting area 25 means that the outer wall of the mounting area 25 facing the battery cell 11 and the outer wall of the mounting area 25 away from the battery cell 11 are both formed by the fiber composite material layer 212.

[0234] In this embodiment, by forming the fiber composite material layer 212 on the outer wall of the mounting area 25, the insulation withstand voltage performance does not need to be considered, thereby maximizing the structural strength of the housing assembly 20 and reducing its weight.

[0235] In some embodiments, at least a portion of the outer surface of the second intermediate layer 222 is connected to the fiber composite layer 212.

[0236] Here, at least a portion of the outer surface of the second intermediate layer 222 may be connected to the fiber composite material layer 212, or the entire outer surface of the second intermediate layer 222 may be connected to the fiber composite material layer 212.

[0237] The manner in which the outer surface of the second intermediate layer 222 is connected to the fiber composite material layer 212 is not limited here.

[0238] For example, the outer surface of the second intermediate layer 222 may be bonded to the fiber composite layer 212.

[0239] For example, the fiber composite layer 212 may be formed on the outer surface of the second intermediate layer 222.

[0240] In this embodiment, by connecting at least a portion of the outer surface of the second intermediate layer 222 to the fiber composite material layer 212, it is beneficial to improve the connection strength between the second intermediate layer 222 and the outer covering layer 21, thereby improving the structural strength of the housing assembly 20.

[0241] In some embodiments, please continue reading Figures 3 to 5The mounting area 25 also includes a second through hole 251, which penetrates the outer covering layer 21 and the second intermediate layer 222. The mounting component is at least partially disposed within the second through hole 251.

[0242] Here, the number and size of the second through holes 251 are not limited, as long as they can be used to install the mounting components.

[0243] For example, the number of second through holes 251 can be one or more.

[0244] In this disclosure, "multiple" refers to two or more items.

[0245] In this embodiment, the mounting component is installed by providing a second through hole 251.

[0246] In some embodiments, please refer to Figure 4 , Figure 11 as well as Figure 12 The intermediate layer 22 includes a third intermediate layer 223, the first receiving cavity 23 includes a bottom wall 26, the battery cell 11 is supported on the bottom wall 26, and the bottom wall 26 is provided with the third intermediate layer 223.

[0247] Here, the first receiving cavity 23 includes a bottom wall 26, and the battery cell 11 is disposed in the first receiving cavity 23, that is, the battery cell 11 is supported by the bottom wall 26, thereby the bottom wall 26 has a certain load-bearing capacity.

[0248] In this embodiment, by providing a third intermediate layer 223 on the bottom wall 26, it is beneficial to improve the structural strength of the bottom wall 26, thereby further improving the structural strength of the housing assembly 20.

[0249] In some embodiments, please refer to Figure 4 , Figure 11 as well as Figure 12 The insulating structure layer 211 forms a third wall 261 on the side of the bottom wall 26 facing the battery cell 11, the fiber composite material layer 212 forms a fourth wall 262 on the side of the bottom wall 26 facing away from the battery cell 11, and the third intermediate layer 223 is located between the insulating structure layer 211 and the fiber composite material layer 212.

[0250] The insulating structure layer 211 forms a third wall 261 on the side of the bottom wall 26 facing the battery cell 11. In other words, the third wall 261 constitutes part of the inner wall of the first receiving cavity 23.

[0251] The fiber composite material layer 212 forms at least a portion of the bottom wall 26 on the side opposite to the battery cell 11, that is, the fourth wall 262 constitutes part of the outer wall of the first receiving cavity 23.

[0252] The fiber composite layer 212 forming at least a portion of the bottom wall 26 on the side opposite to the battery cell 11 means that the fiber composite layer 212 can form a portion of the bottom wall 26 on the side opposite to the battery cell 11, or the fiber composite layer 212 can form the entire bottom wall 26 on the side opposite to the battery cell 11.

[0253] In the embodiment where the fiber composite material layer 212 forms a fourth wall 262 on the side of the bottom wall 26 facing away from the battery cell 11, the insulating structure layer 211 can form another part of the bottom wall 26 on the side of the bottom wall 26 facing away from the battery cell 11. This facilitates the connection between the insulating structure layer 211 and the fiber composite material layer 212. Alternatively, the first composite material layer can form another part of the bottom wall 26 on the side of the bottom wall 26 facing away from the battery cell 11. In other words, the insulating structure layer 211 and the fiber composite material layer 212 are connected through the first composite material layer.

[0254] It should be noted that the specific structure of the third intermediate layer 223 is not limited here.

[0255] In some embodiments, please refer to Figures 3 to 4 The battery device 100 includes a battery cell group 10, which includes a plurality of battery cells 11 stacked along a first direction. The housing assembly 20 includes end walls 24 located at both ends of the battery cell group 10 along the first direction. The third intermediate layer 223 includes a first strip 2231 that extends along the first direction and connects to the end walls 24.

[0256] For example, the first strip 2231 is elongated.

[0257] Here, the first strip 2231 can be connected to the end wall 24 at one end along the first direction, or it can be connected to the end wall 24 at both ends along the first direction.

[0258] By connecting the first strip 2231 to the end wall 24, it is beneficial to further improve the structural strength of the housing assembly 20.

[0259] For example, there are multiple first strips 2231, and each first strip 2231 is spaced apart along a second direction, the first direction being perpendicular to the second direction.

[0260] In this embodiment, by setting the third intermediate layer 223 to include the first strip 2231 and connecting the first strip 2231 to the end wall 24, it is beneficial to further improve the structural strength of the housing assembly 20.

[0261] In addition, the first strip 2231 is long and can be spaced out, which helps to reduce the weight of the third intermediate layer 223 compared to a single third intermediate layer 223, thereby further reducing the weight of the housing assembly 20.

[0262] In some embodiments, please refer to Figures 3 to 4 The battery device 100 includes a plurality of battery cell groups 10, which are arranged along a second direction. A first strip 2231 is located at the bottom of two adjacent battery cell groups 10 and at least partially overlaps with the projection of the two adjacent battery cell groups 10 along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other.

[0263] For example, the third party is directed towards, for example, the height direction of the battery device 100.

[0264] The first strip 2231 is located at the bottom of two adjacent battery cell groups 10 and at least partially overlaps with the projection of the two adjacent battery cell groups 10 along a third direction. In other words, both adjacent battery cell groups 10 can be supported by the first strip 2231, meaning that the first strip 2231 can support the two adjacent battery cell groups 10.

[0265] In this embodiment, by placing the first strip 2231 at the bottom of two adjacent battery cell groups 10 and at least partially overlapping the projection of the two adjacent battery cell groups 10 along a third direction, it is beneficial to the layout of the first strip 2231 and the battery cell groups 10, which can make the structure of the housing assembly 20 compact, improve the structural strength of the housing assembly 20, and reduce the weight of the housing assembly 20 as much as possible.

[0266] In other embodiments, the battery device 100 includes a plurality of battery cell groups 10 arranged along a second direction. A first strip 2231 corresponds one-to-one with a battery cell group 10 and is located at the bottom of the battery cell group 10. The projection of the first strip 2231 and the battery cell group 10 along a third direction at least partially overlaps. The first direction, the second direction, and the third direction are perpendicular to each other.

[0267] The first strip 2231 corresponds one-to-one with the battery cell group 10. The projection of the first strip 2231 and the battery cell group 10 along a third direction at least partially overlaps. That is to say, each battery cell group 10 is supported by a first strip 2231, and each first strip 2231 can support a battery cell group 10.

[0268] In this embodiment, by having the first strip 2231 correspond one-to-one with the battery cell group 10, the projections of the first strip 2231 and the battery cell group 10 along a third direction at least partially overlap, which is beneficial to the layout of the first strip 2231 and the battery cell group 10, and can make the structure of the housing assembly 20 compact, thereby improving the structural strength of the housing assembly 20.

[0269] In some embodiments, please refer to Figures 9 to 12 A portion of the outer surface of the third intermediate layer 223 is connected to the insulating structural layer 211, and a portion of the outer surface of the third intermediate layer 223 is connected to the fiber composite material layer 212.

[0270] For example, the third intermediate layer 223 is connected to the insulating structure layer 211 on the outer surface facing the first receiving cavity 23, and the third intermediate layer 223 is connected to the fiber composite material layer 212 on the outer surface facing away from the first receiving cavity 23.

[0271] The manner in which the third intermediate layer 223 is connected to the insulating structural layer 211 and / or the fiber composite material layer 212 is not limited here.

[0272] For example, the third intermediate layer 223 may be bonded to the insulating structural layer 211 and / or the fiber composite layer 212.

[0273] For example, the insulating structural layer 211 and / or the fiber composite layer 212 may be formed on the outer surface of the third intermediate layer 223.

[0274] In this embodiment, by connecting at least a portion of the outer surface of the third intermediate layer 223 to the insulating structural layer 211 and / or the fiber composite material layer 212, it is beneficial to improve the connection strength between the third intermediate layer 223 and the outer covering layer 21, thereby improving the structural strength of the housing assembly 20.

[0275] In some embodiments, please refer to Figure 13 , Figure 14 and Figure 19 Each battery cell 11 has a pressure relief section, and each battery cell 11 is arranged such that the pressure relief section faces the bottom wall 26. The bottom wall 26 includes a pressure relief region 264 and a reinforcing region 263. The pressure relief region 264 and the reinforcing region 263 are spaced apart along a second direction. At least the reinforcing region 263 is provided with a first strip 2231. The shoulder of the battery cell 11 abuts against two adjacent reinforcing regions 263 at both ends along the first direction. The projection of each pressure relief section is located within the projection of the corresponding pressure relief region 264.

[0276] Here, the pressure relief section of the battery cell 11 can be a pressure relief valve.

[0277] For example, the third intermediate layer 223 includes a plurality of first strips 2231 extending along a first direction and disposed in the reinforcing region 263, the first direction intersecting with the second direction.

[0278] Here, the intersection of the first direction and the second direction means that the first direction and the second direction are not parallel; for example, the first direction and the second direction are perpendicular.

[0279] For example, the battery device 100 includes a battery cell group 10, which includes a plurality of battery cells 11 stacked along a second direction, and the plurality of battery cell groups 10 are spaced apart along a first direction.

[0280] Here, the reinforcement area 263 is improved by setting the first strip 2231 and by having the two ends of the shoulder of the battery cell 11 abut against the two adjacent reinforcement areas 263 along the first direction.

[0281] Here, the pressure relief area 264 can be opened after braking, or the pressure relief area 264 can be a through hole that directly connects to the outside of the first receiving cavity 23.

[0282] For example, please refer to Figures 15 to 18 The housing assembly 20 also includes a protective plate 30, which is disposed on the side of the bottom wall 26 away from the first receiving cavity 23 and forms a second receiving cavity 31 between the protective plate 30 and the bottom wall 26.

[0283] Here, the protective plate 30 can be the bottom protective plate.

[0284] For example, the first receiving cavity 23 is connected to the second receiving cavity 31 through the pressure relief region 264.

[0285] As an example, the second receiving cavity 31 is connected to the outside of the battery device 100. High-temperature fluid generated during thermal runaway of the battery device 100 can flow into the second receiving cavity 31 through the pressure relief area 264, and then be discharged to the outside of the battery device 100 through the second receiving cavity 31. This achieves separation of the high-temperature fluid from the components inside the first receiving cavity 23, which can reduce the risk of damage to other normally functioning battery cells 11 caused by the high-temperature fluid. Furthermore, the second receiving cavity 31 can also separate the high-temperature fluid from high-voltage components, which is beneficial in reducing damage to the high-voltage components of the battery device 100, thereby mitigating insulation failure and even short-circuit arcing.

[0286] For example, at least one pressure relief region 264 is provided on the first cavity wall of the first receiving cavity 23, that is, the number of pressure relief regions 264 provided on the first cavity wall is one or more.

[0287] In this embodiment, by configuring the bottom wall 26 to include a pressure relief region 264 and a reinforcing region 263, with the pressure relief region 264 and the reinforcing region 263 spaced apart along a first direction, on the one hand, the support for the battery cell 11 is improved by having the shoulders of the battery cell 11 abut against the two adjacent reinforcing regions 263 along the first direction. On the other hand, by configuring the pressure relief portion of the battery cell 11 corresponding to the pressure relief region 264, in the event of thermal runaway of the battery cell 11, the fluid in the first receiving cavity 23 can flow out from the pressure relief region 264.

[0288] In some embodiments, please refer to Figures 13 to 19 The pressure relief area 264 has a pressure relief port, which is set in the pressure relief part of the battery cell 11.

[0289] For example, the pressure relief port is provided corresponding to the pressure relief part of the battery cell 11, which is beneficial to allow the high-temperature fluid flowing out of the pressure relief part from the thermal runaway of the battery cell 11 to be discharged through the pressure relief port.

[0290] For example, the projection of the pressure relief part is located within the projection range of the pressure relief port when projected onto the bottom wall 26.

[0291] For example, the pressure relief section is positioned directly opposite the pressure relief port.

[0292] In this embodiment, by forming a pressure relief port in the pressure relief region 264, the high-temperature fluid flowing out of the pressure relief section from the thermal runaway of the battery cell 11 can be discharged through the pressure relief port.

[0293] Here, the pressure relief port can correspond one-to-one with the pressure relief part of the battery cell 11, or one pressure relief port can correspond to the pressure relief parts of multiple battery cells 11. For example, one pressure relief port corresponds to the pressure relief part of the battery cell 11 of a battery cell group 10.

[0294] In some embodiments, please refer to Figure 19 The third intermediate layer 223 also includes a plurality of second strips 2232, which extend along a second direction, and at least the pressure relief region 264 is provided with the second strips 2232.

[0295] Here, the second strip 2232 avoids the pressure relief port to achieve pressure relief during thermal control of the battery cell 11. For example, the second strip 2232 has a relief hole in the area of ​​the pressure relief port.

[0296] In other embodiments, the area of ​​the second strip 2232 located at the pressure relief port can be locally thinned so that the high-temperature fluid generated during the thermal control of the battery cell 11 can destroy the second strip 2232 located at the pressure relief port to relieve pressure.

[0297] Here, the first strip 2231 and the second strip 2232 may or may not be connected.

[0298] In this embodiment, by providing a second strip 2232, and at least the pressure relief area 264 is provided with a second strip 2232, it is beneficial to further improve the structural strength of the bottom wall 26, thereby improving the reliability of supporting the battery cell 11.

[0299] In some embodiments, please refer to Figure 13 and Figure 16 The bottom wall 26 has a reinforcing rib 265 protruding from the side opposite to the first receiving cavity 23, and the reinforcing rib 265 is provided with a third intermediate layer 223.

[0300] For example, the reinforcing rib 265 is provided in the reinforcing region 263.

[0301] For example, some of the reinforcing ribs 265 extend along a first direction, so that a first strip 2231 can be provided within the reinforcing rib 265. Another portion of the reinforcing ribs 265 extends along a second direction, so that a second strip 2232 can be provided within the reinforcing rib 265.

[0302] For example, the reinforcing rib 265 corresponds one-to-one with the third intermediate layer 223.

[0303] Here, by setting reinforcing ribs 265, the bottom wall 26 can further improve its structural strength, thereby improving the support strength of the bottom wall 26 for the battery cell 11. On the other hand, the setting of reinforcing ribs 265 provides space for the setting of the third intermediate layer 223.

[0304] In some embodiments, please refer to Figures 15 to 18 The housing assembly 20 also includes a protective plate 30, which is disposed on the side of the bottom wall 26 opposite to the first receiving cavity 23, and forms a second receiving cavity 31 between the protective plate 30 and the bottom wall 26. The protective plate 30 has a protrusion 32 protruding from the side facing the bottom wall 26, and the protrusion 32 abuts against the reinforcing rib 265.

[0305] For example, the reinforcing rib 265 corresponds one-to-one with the protrusion 32.

[0306] In this embodiment, by forming a protrusion 32 on the side of the protective plate 30 facing the bottom wall 26, the structural strength of the protective plate 30 is improved. In addition, by abutting the protrusion 32 against the reinforcing rib 265, the structural strength of the housing assembly 20 and the support strength of the bottom wall 26 for the battery cell 11 are further improved.

[0307] In some embodiments, please refer to Figure 16 The protrusion 32 is bonded to the reinforcing rib 265.

[0308] In other words, by setting an adhesive layer, the protrusion 32 and the reinforcing rib 265 are bonded together by the adhesive layer.

[0309] In this embodiment, the load-bearing capacity of the entire housing assembly 20 is further improved by bonding the protrusion 32 to the reinforcing rib 265.

[0310] In some embodiments, the intermediate layer 22 is a one-piece structure.

[0311] For example, in an embodiment where the intermediate layer 22 includes only the first strip 2231, each first strip 2231 is an integral structure.

[0312] For example, in an embodiment where the intermediate layer 22 includes a first strip 2231 and a second strip 2232, each first strip 2231 and each second strip 2232 are integral structures.

[0313] Here, the term "intermediate layer 22 is an integral structure" means that the intermediate layer 22 can be directly formed into an integral structure, or it can be connected to form an integral structure.

[0314] In this embodiment, by setting the intermediate layer 22 as an integral structure, the integrity of the intermediate layer 22 is improved, thereby enhancing the structural strength of the intermediate layer 22 and thus improving the load-bearing capacity of the entire housing assembly 20.

[0315] Here, to accommodate the bottom venting requirements of the battery cell 11, multiple pressure relief ports are provided on the bottom wall 26 of the housing assembly 20. These pressure relief ports can reduce the overall strength of the housing assembly 20 to some extent. Therefore, an intermediate layer 22 is provided within the bottom wall 26 to improve its support strength, and evenly distributed transverse and longitudinal reinforcing ribs 265 are provided on the bottom wall 26 to further enhance its support strength. Furthermore, by configuring the bottom wall 26 of the housing assembly 20 to include an insulating structural layer 211 and a fiber composite material layer 212, the composite material layer is lightweight and has high strength. This helps to reduce the weight of the housing assembly 20 and improve its structural strength, thereby improving the energy density and structural strength of the battery device 100.

[0316] In some embodiments, please refer to Figure 3 and Figure 6 The battery device 100 includes a battery cell group 10, which includes a plurality of battery cells 11 stacked along a first direction. The housing assembly 20 includes a side wall 27 located on both sides of the battery cell group 10 along a second direction. The intermediate layer 22 also includes a fourth intermediate layer, and the side wall 27 is provided with the fourth intermediate layer.

[0317] In this embodiment, by providing a fourth intermediate layer on the side wall 27 of the housing assembly 20, it is beneficial to improve the structural strength of the side wall 27, thereby further improving the structural strength of the housing assembly 20.

[0318] In some embodiments, please refer to Figure 3 and Figure 6 The insulating structure layer 211 forms a fifth wall 271 on the side of the sidewall 27 facing the battery cell 11, the fiber composite material layer 212 forms a sixth wall 272 on the side of the sidewall 27 facing away from the battery cell 11, and at least a fourth intermediate layer is located between the insulating structure layer 211 and the fiber composite material layer 212.

[0319] The insulating structure layer 211 forms a fifth wall 271 on the side of the sidewall 27 facing the battery cell 11. In other words, the fifth wall 271 constitutes part of the inner wall of the first receiving cavity 23.

[0320] The fiber composite material layer 212 forms at least a partial sixth wall 272 on the side of the sidewall 27 facing away from the battery cell 11, that is, the sixth wall 272 constitutes part of the outer wall of the first receiving cavity 23.

[0321] The fiber composite layer 212 forming at least a portion of the sidewall 27 on the side opposite to the battery cell 11 means that the fiber composite layer 212 can form a partial sidewall 27 on the side opposite to the battery cell 11, or the fiber composite layer 212 can form a sixth wall 272 on the side opposite to the battery cell 11 for all of its sidewalls 27.

[0322] In the embodiment where the fiber composite material layer 212 forms a sixth wall 272 on the side of the side opposite to the battery cell 11, the insulating structure layer 211 can form another sixth wall 272 on the side of the side opposite to the battery cell 11. This facilitates the connection between the insulating structure layer 211 and the fiber composite material layer 212. Alternatively, the first composite material layer can form another sixth wall 272 on the side of the side opposite to the battery cell 11. In other words, the insulating structure layer 211 and the fiber composite material layer 212 are connected through the first composite material layer.

[0323] In some embodiments, at least a portion of the outer surface of the fourth intermediate layer is connected to the insulating structural layer 211 and / or the fiber composite material layer 212.

[0324] In other words, at least part of the outer surface of the fourth intermediate layer can be connected to the insulating structure layer 211, or to the fiber composite material layer 212, or to both the insulating structure layer 211 and the fiber composite material layer 212.

[0325] Here, a portion of the outer surface of the fourth intermediate layer may be connected to the insulating structure layer 211 and / or the fiber composite material layer 212, or the entire outer surface of the fourth intermediate layer may be connected to the insulating structure layer 211 and / or the fiber composite material layer 212.

[0326] The manner in which the fourth intermediate layer is connected to the insulating structural layer 211 and / or the fiber composite material layer 212 is not limited here.

[0327] For example, the fourth intermediate layer may be bonded to the insulating structural layer 211 and / or the fiber composite layer 212.

[0328] For example, the insulating structural layer 211 and / or the fiber composite layer 212 may be formed on the outer surface of the fourth intermediate layer.

[0329] In this embodiment, by connecting at least a portion of the outer surface of the fourth intermediate layer to the insulating structural layer 211 and / or the fiber composite material layer 212, it is beneficial to improve the connection strength between the fourth intermediate layer and the outer covering layer 21, thereby improving the structural strength of the housing assembly 20.

[0330] In some embodiments, please refer to Figures 8 to 12 The intermediate layer 22 includes at least one of a metal part 224, a composite material part, or a foam part 225.

[0331] In other words, the intermediate layer 22 can be any one of the metal part 224, the composite material part, or the foam part 225, or it can include any two of the metal part 224, the composite material part, or the foam part 225, or it can include all three of the metal part 224, the composite material part, and the foam part 225.

[0332] Here, the metal part 224 has good structural strength, which is beneficial to improving the structural strength of the intermediate layer 22.

[0333] For example, the composite material part can be a fiber-reinforced composite material with high modulus and high strength, such as high modulus carbon fiber, ultra-high molecular weight polyethylene fiber, etc., and the matrix resin can be polyurethane or epoxy resin. At the same time, if there is a high temperature resistance requirement, high temperature resistant phenolic resin or ceramicizable resin material can also be selected.

[0334] For example, the foam component 225 can be a high-strength thermoplastic foam, such as MPPE (Modified Polyphenylene Ether), PET (Polyethylene terephthalate), etc., or it can be a thermosetting PU (Polyurethane) foam, epoxy foam, or PMI (Polymethyl Methacrylate Imide) foam, etc.

[0335] In some embodiments, the intermediate layer 22 includes a foam element 225 and a first composite material layer, wherein the first composite material layer covers the foam element 225.

[0336] Here, the foam part 225 can be integrally molded by foaming through a mold, or it can be assembled by splicing. After the foam part 225 is formed, based on the frame of the foam part 225, the first composite material layer is wrapped on the outer surface of the foam part 225, and then integrally molded into the intermediate layer 22.

[0337] In this embodiment, by setting the intermediate layer 22 to include a foam component 225 and a first composite material layer, on the one hand, the combination of the foam component 225 and the first composite material layer is beneficial to improving the structural strength of the intermediate layer 22; on the other hand, the foam component 225 is relatively lightweight, thus helping to reduce the weight of the intermediate layer 22.

[0338] In some embodiments, the first composite material layer comprises carbon fiber fabric.

[0339] For example, carbon fiber fabric is formed by weaving carbon fibers.

[0340] For example, the carbon fiber fabric is a woven fabric.

[0341] In this embodiment, by setting the first composite material layer to include carbon fiber fabric, it is beneficial to further improve the structural strength of the first composite material layer while reducing its weight.

[0342] In some embodiments, the first composite material layer includes a first substrate and a first fiber.

[0343] For example, the first substrate includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin.

[0344] For example, the first fiber includes at least one of carbon fiber and polyethylene fiber.

[0345] Here, the first substrate serves to bond and protect the reinforcing phases such as carbon fiber and polyethylene fiber, and to transfer the stress caused by the external load to the reinforcing phases such as carbon fiber and polyethylene fiber.

[0346] In some embodiments, an adhesive layer is provided between the intermediate layer 22 and the outer covering layer.

[0347] In other words, the intermediate layer 22 and the outer covering layer are bonded together by an adhesive layer.

[0348] In some embodiments, please refer to Figure 8 The intermediate layer 22 includes a reinforcing plate 2241, and the bottom wall 26 of the first receiving cavity 23 includes a reinforcing plate 2241, with a protrusion 2245 formed on the reinforcing plate 2241.

[0349] Here, the third intermediate layer 223 can be a reinforcing plate 2241.

[0350] For example, the reinforcing plate 2241 may be a metal part 224 or a composite material part, etc.

[0351] Here, since the battery cell 11 is disposed in the first receiving cavity 23, that is, the battery cell 11 is supported by the bottom wall 26, the bottom wall 26 has a certain load-bearing capacity. By including the reinforcing plate 2241 in the bottom wall 26 of the first receiving cavity 23, it is beneficial to improve the structural strength of the housing assembly 20.

[0352] Here, the reinforcing plate 2241 has multiple protrusions 2245 formed by protrusions.

[0353] In this embodiment, the reinforcing plate 2241 has a protrusion 2245 formed by protrusion. On the one hand, it is beneficial to further improve the structural strength of the box assembly 20. On the other hand, the formation of the protrusion 2245 is beneficial to improve the connection strength between the reinforcing plate 2241 and other components (foam 225 and outer covering layer 21, etc.).

[0354] In some embodiments, please refer to Figure 8 The number of protrusions 2245 is multiple, and the multiple protrusions 2245 are spaced apart along the first direction. Each protrusion 2245 extends along the second direction, and the first direction is perpendicular to the second direction.

[0355] Here, the battery device 100 includes a battery cell group 10, which includes a plurality of battery cells 11 stacked along a first direction.

[0356] In this embodiment, the layout of the protrusion 2245 and the battery cell group 10 is advantageous, so that the arrangement of the protrusion 2245 is adapted to the distribution of the battery cell group 10, which is beneficial to improving the structural strength and reliability of the housing assembly 20.

[0357] In other embodiments, there are two protrusions 2245, which extend along the diagonal of the first receiving cavity 23.

[0358] The structure is simple and helps to improve the structural strength and reliability of the housing assembly 20.

[0359] In some embodiments, please refer to Figures 6 to 12 The housing assembly 20 also includes a mounting area 25 for mounting a mounting component. The battery device 100 is connected to the power device through the mounting component. The intermediate layer 22 also includes a reinforcing block 2242. The mounting area 25 is provided with the reinforcing block 2242, which is connected to the reinforcing plate 2241. At least a portion of the reinforcing block 2242 has a first locking hole.

[0360] Here, the second intermediate layer 222 can be a reinforcing block 2242.

[0361] For example, the reinforcing block 2242 may be a metal part 224 or a composite material part, etc.

[0362] In this embodiment, by providing a reinforcing block 2242 to the mounting area 25, the structural strength of the mounting area 25 is improved, thereby further improving the structural strength of the battery device 100. Furthermore, by forming a first locking hole in at least a portion of the reinforcing block 2242, it can be connected to other components through the first locking hole, thus improving the structural strength of the connection point of the mounting area 25.

[0363] In some embodiments, please refer to Figures 8 to 12 The battery device 100 includes a battery cell group 10, which includes a plurality of battery cells 11 stacked along a first direction. The housing assembly 20 includes an end wall 24 located at both ends of the battery cell group 10 along the first direction. The intermediate layer 22 also includes a reinforcing profile 2243. The end wall 24 is provided with the reinforcing profile 2243, which extends along the extension direction of the end wall 24 and is connected to the reinforcing plate 2241.

[0364] Here, the first intermediate layer 221 can be a reinforcing profile 2243.

[0365] For example, the reinforcing profile 2243 can be a metal part 224 or a composite material part, etc.

[0366] For example, the reinforcing profile 2243 has a cavity inside, which helps to reduce the weight of the reinforcing profile 2243 while giving it a certain structural strength.

[0367] In this embodiment, by providing a reinforcing profile 2243 to the end wall 24 and connecting the reinforcing profile 2243 to the reinforcing plate 2241, it is beneficial to further improve the structural strength of the end wall 24, thereby improving the structural strength of the housing assembly 20.

[0368] In some embodiments, please refer to Figure 2 and Figure 8 The enclosure assembly 20 includes a first enclosure 28 and a second enclosure 29, which together form a first receiving cavity 23. The first enclosure 28 includes an insulating structural layer 211, a fiber composite material layer 212, and an intermediate layer 22. The intermediate layer 22 of the first enclosure 28 also includes a reinforcing insert 2244, which has a second locking hole. The first enclosure 28 is connected to the second enclosure 29 through the second locking hole.

[0369] For example, the first housing 28 includes a sidewall 27, which includes a reinforcing insert 2244.

[0370] For example, the reinforcing insert 2244 is in the form of a ring.

[0371] In this embodiment, by setting the intermediate layer 22 of the first housing 28 to also include a reinforcing insert 2244, the reinforcing insert 2244 having a second locking hole, the first housing 28 is connected to the second housing 29 through the second locking hole, thus enabling the first housing 28 to withstand a higher locking torque, which is beneficial to improving the connection strength between the first housing 28 and the second housing 29.

[0372] For example, at least one of the reinforcing plate 2241, reinforcing block 2242, reinforcing profile 2243 and reinforcing insert 2244 is a metal part 224.

[0373] For example, the reinforcing block 2242 and the reinforcing profile 2243 are connected to the reinforcing plate 2241.

[0374] In some embodiments, please refer to Figures 8 to 12 The intermediate layer 22 includes a metal part 224 and a foam part 225, with the metal part 224 connected to the foam part 225.

[0375] For example, the foam part 225 is formed on the surface of the metal part 224. Specifically, the foam part 225 can be integrally foamed and formed on the surface of the metal part 224 by a mold.

[0376] For example, the metal part 224 is bonded to the foam part 225.

[0377] In this embodiment, connecting the metal part 224 with the foam part 225 helps to improve the structural strength of the intermediate layer 22.

[0378] In some embodiments, please refer to Figures 3 to 12 The battery device 100 includes a battery cell group 10, which includes a plurality of battery cells 11 stacked along a first direction. The housing assembly 20 includes an end wall 24 and a mounting area 25. The end wall 24 is located at both ends of the battery cell group 10 along the first direction. The metal part 224 includes a reinforcing plate 2241, a reinforcing block 2242, and a reinforcing profile 2243. The reinforcing block 2242 and the reinforcing profile 2243 are connected to the reinforcing plate 2241. The bottom wall 26 of the first receiving cavity 23 is provided with the reinforcing plate 2241, the end wall 24 is provided with the reinforcing profile 2243, the mounting area 25 is provided with the reinforcing block 2242, and at least a portion of the reinforcing block 2242 forms a first locking hole.

[0379] In some embodiments, the thickness of the insulating structure layer 211 is less than or equal to the thickness of the fiber composite material layer 212.

[0380] Here, the insulating structure layer 211 mainly serves as insulation and withstand voltage, while the fiber composite material layer 212 mainly serves to reduce weight and increase strength. Therefore, by setting the thickness of the insulating structure layer 211 to be less than or equal to the thickness of the fiber composite material layer 212, it is beneficial to have insulation and withstand voltage on the side of the housing assembly 20 that contacts the battery cell group 10, while also reducing weight and increasing strength as much as possible.

[0381] In some embodiments, the thickness of the insulating structure layer 211 is in the range of 0.1 mm to 1.0 mm.

[0382] The thickness of the insulating structure layer 211 can be any one of 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, or any combination thereof.

[0383] It is understandable that the greater the thickness of the insulating structure layer 211, the better it is to improve the structural strength of the insulating structure layer 211, and the smaller the thickness of the insulating structure layer 211, the better it is to reduce the weight and manufacturing cost of the housing assembly 20.

[0384] By setting the thickness of the insulating structure layer 211 to 0.1mm-1.0mm, the insulating structure layer 211 can have a certain structural strength while also helping to reduce the weight and manufacturing cost of the housing assembly 20.

[0385] In some embodiments, the thickness of the fiber composite layer 212 is in the range of 1.0 mm to 2.5 mm.

[0386] The thickness of the fiber composite layer 212 can be any one of 1.0mm, 1.2mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, or any combination thereof.

[0387] It is understandable that the greater the thickness of the fiber composite layer 212, the better it is to improve the structural strength of the fiber composite layer 212, and the smaller the thickness of the fiber composite layer 212, the better it is to reduce the weight and manufacturing cost of the box assembly 20.

[0388] By setting the thickness of the fiber composite layer 212 to 1.0mm-2.5mm, the fiber composite layer 212 can have a certain structural strength while also helping to reduce the weight and manufacturing cost of the box assembly 20.

[0389] Here, the thickness of the insulating structural layer 211 can be the same as or different from the thickness of the fiber composite material layer 212. In this embodiment, the outer wall of the housing assembly 20 is formed by the outer covering layer 21, that is, the outer covering layer 21 forms the surface layer of the housing assembly 20. A cavity is formed in the housing assembly 20 within the outer covering layer 21. By filling the cavity with the intermediate layer 22, the outer covering layer 21 of the housing assembly 20 is supported, thereby improving the impact resistance and load-bearing capacity of the housing assembly 20.

[0390] According to the embodiments disclosed in this application, a first intermediate layer 221 is formed on the end wall 24 of the housing assembly 20. The first intermediate layer 221 is connected to the outer covering layer 21 to improve the impact resistance and load-bearing capacity of the end wall 24 of the housing assembly 20.

[0391] According to the embodiments disclosed in this application, the mounting area 25 of the housing assembly 20 is formed with a second intermediate layer 222, which is connected to the outer covering layer 21 to improve the impact resistance and load-bearing capacity of the mounting area 25 of the housing assembly 20.

[0392] According to the embodiments disclosed in this application, a third intermediate layer 223 is formed on the bottom wall 26 of the housing assembly 20. The third intermediate layer 223 is connected to the outer covering layer 21 to improve the impact resistance and load-bearing capacity of the bottom wall 26 of the housing assembly 20.

[0393] According to the embodiments disclosed in this application, a fourth intermediate layer is formed on the side wall 27 of the housing assembly 20. The fourth intermediate layer is connected to the outer covering layer 21 to improve the impact resistance and load-bearing capacity of the side wall 27 of the housing assembly 20.

[0394] In the description of this disclosure, references to terms such as "in one embodiment," "in some embodiments," "in other embodiments," "in yet another embodiment," or "exemplary," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the embodiments of this disclosure. In this disclosure, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, those skilled in the art can combine the different embodiments or examples described in this disclosure and the features of the different embodiments or examples without contradiction.

[0395] The above description is merely a preferred embodiment of this application and is not intended to limit the application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the scope of protection of this application.

Claims

1. A battery device, characterized by, The battery device includes a housing assembly and battery cells. The housing assembly has a first receiving cavity, and the battery cells are disposed within the first receiving cavity. The housing assembly includes an outer covering layer, which includes an insulating structural layer and a fiber composite material layer. The insulating structural layer forms at least a portion of the inner wall of the housing assembly facing the first receiving cavity, and the fiber composite material layer forms at least a portion of the outer wall of the housing assembly facing away from the first receiving cavity. At least a portion of the housing assembly also includes an intermediate layer, which is covered by the outer covering layer.

2. The battery device according to claim 1, characterized by The battery device includes a battery cell group, the battery cell group including a plurality of battery cells stacked along a first direction, the housing assembly including a bottom wall and an end wall, the bottom wall and the end wall defining at least a portion of the first receiving cavity; the end wall is located at both ends of the battery cell group along the first direction, the intermediate layer including a first intermediate layer, the end wall being provided with the first intermediate layer.

3. The battery device of claim 2, wherein, The insulating structure layer forms a first wall on the side of the end wall facing the battery cell, the fiber composite material layer forms a second wall on the side of the end wall facing away from the battery cell, and at least a portion of the first intermediate layer is located between the insulating structure layer and the fiber composite material layer.

4. The battery device of claim 3, wherein At least a portion of the outer surface of the first intermediate layer is connected to the insulating structural layer and / or the fiber composite material layer; and / or, A portion of the insulating structure layer of the end wall is configured as a flange, and the flange is connected to the composite material layer to form a connection structure.

5. The battery device of claim 4, wherein, The connecting structure is located at the end of the end wall on the side opposite to the bottom wall along the thickness direction of the bottom wall, or, The connecting structure is located on the side of the end wall that is opposite to the first receiving cavity along the thickness direction of the end wall.

6. The battery device according to claim 4, characterized in that, In the connection structure, the flanged portion overlaps with the fiber composite material layer, or the flanged portion is butt-jointed with the fiber composite material layer.

7. The battery device of claim 6, wherein The housing assembly further includes an overlap layer, in which the flanged portion is mated to the fiber composite material layer, and the overlap layer at least covers the mating seam between the flanged portion and the fiber composite material layer.

8. The battery device according to any one of claims 1 to 7, characterized by, The intermediate layer includes a second intermediate layer, and the housing assembly further includes a mounting area for mounting components. The battery device is connected to the power device through the mounting components, and the mounting area is provided with the second intermediate layer.

9. The battery device of claim 8, wherein, The fiber composite material layer forms the outer wall of the mounting area, and the fiber composite material layer covers the second intermediate layer; and / or, At least a portion of the outer surface of the second intermediate layer is connected to the fiber composite material layer.

10. The battery device of claim 8, wherein, The mounting area also includes a second through hole, which penetrates the outer covering layer and the second intermediate layer, and the mounting component is at least partially disposed within the second through hole.

11. The battery device of claim 1, wherein The intermediate layer includes a third intermediate layer, the first receiving cavity includes a bottom wall, the battery cell is supported on the bottom wall, and the bottom wall is provided with the third intermediate layer.

12. The battery device of claim 11, wherein, The insulating structural layer forms a third wall on the side of the bottom wall facing the battery cell, the fiber composite material layer forms a fourth wall on the side of the bottom wall facing away from the battery cell, and the third intermediate layer is located between the insulating structural layer and the fiber composite material layer.

13. The battery device of claim 11, wherein, The battery device includes a battery cell group, which includes a plurality of battery cells stacked along a first direction. The housing assembly includes end walls located at both ends of the battery cell group along the first direction. The third intermediate layer includes a first strip extending along the first direction and connected to the end walls.

14. The battery device according to claim 13, characterized in that, The battery device includes multiple battery cell groups arranged along a second direction. The first strip is located at the bottom of two adjacent battery cell groups and at least partially overlaps with the projection of the two adjacent battery cell groups along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other.

15. The battery device according to claim 14, characterized in that, Each of the battery cells has a pressure relief section, and each of the battery cells is arranged such that the pressure relief section faces the bottom wall. The bottom wall includes a pressure relief region and a reinforcement region, and the pressure relief region and the reinforcement region are spaced apart along a second direction. At least the reinforcement region is provided with the first strip. The shoulders of the battery cells abut against two adjacent reinforcement regions at both ends along a first direction. The projection of each pressure relief section is located within the projection of the corresponding pressure relief region.

16. The battery device according to claim 15, characterized in that, The third intermediate layer also includes a plurality of second strips extending along a second direction, and at least the pressure relief area is provided with the second strips.

17. The battery device according to claim 11, characterized in that, A portion of the outer surface of the third intermediate layer is connected to the insulating structural layer, and a portion of the outer surface of the third intermediate layer is connected to the fiber composite material layer; and / or, The bottom wall protrudes from the side opposite to the first receiving cavity and is provided with a reinforcing rib, and the reinforcing rib is provided with the third intermediate layer.

18. The battery device according to claim 17, characterized in that, The housing assembly also includes a protective plate, which is disposed on the side of the bottom wall away from the first receiving cavity and forms a second receiving cavity with the bottom wall; the protective plate has a protruding part on the side facing the bottom wall, and the protruding part abuts against the reinforcing rib.

19. The battery device according to claim 1, characterized in that, The battery device includes a battery cell group, which includes a plurality of battery cells stacked along a first direction. The housing assembly includes sidewalls located on both sides of the battery cell group along a second direction. The intermediate layer also includes a fourth intermediate layer, which is disposed on the sidewalls.

20. The battery device according to claim 19, characterized in that, The insulating structure layer forms a fifth wall on the side of the sidewall facing the battery cell, the fiber composite material layer forms a sixth wall on at least a portion of the sidewall facing away from the battery cell, and at least a portion of the fourth intermediate layer is located between the insulating structure layer and the fiber composite material layer.

21. The battery device according to claim 20, characterized in that, At least a portion of the outer surface of the fourth intermediate layer is connected to the insulating structural layer and / or the fiber composite material layer.

22. The battery device according to any one of claims 1 to 7, characterized in that, The intermediate layer includes at least one of a metal component, a composite material component, or a foam component.

23. The battery device according to claim 22, characterized in that, The intermediate layer includes a foam component and a first composite material layer, wherein the first composite material layer covers the foam component.

24. The battery device according to claim 23, characterized in that, The first composite material layer includes a first substrate and a first fiber; The first substrate comprises at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin; and / or, The first fiber includes at least one of carbon fiber and polyethylene fiber.

25. The battery device according to claim 24, characterized in that, The first fiber is a woven fabric.

26. The battery device according to claim 1, characterized in that, The intermediate layer includes a reinforcing plate, and the bottom wall of the first receiving cavity includes the reinforcing plate, which has a protruding portion.

27. The battery device according to claim 26, characterized in that, The number of protrusions is plurality of, and the plurality of protrusions are spaced apart along a first direction, and each protrusion extends along a second direction, wherein the first direction and the second direction intersect; or. The number of protrusions is two, and the two protrusions extend along the diagonal of the first receiving cavity.

28. The battery device according to claim 26, characterized in that, The housing assembly further includes a mounting area for mounting a mounting component. The battery device is connected to the power device via the mounting component. The intermediate layer also includes a reinforcing block. The mounting area is provided with the reinforcing block, which is connected to the reinforcing plate. At least a portion of the reinforcing block forms a first locking hole.

29. The battery device according to claim 26, characterized in that, The battery device includes a battery cell group, which includes a plurality of battery cells stacked along a first direction. The housing assembly includes end walls located at both ends of the battery cell group along the first direction. The intermediate layer also includes a reinforcing profile, which is provided on the end wall. The reinforcing profile extends along the extension direction of the end wall and is connected to the reinforcing plate.

30. The battery device according to claim 26, characterized in that, The housing assembly includes a first housing and a second housing, the first housing and the second housing enclosing the first receiving cavity; The first housing includes the insulating structure layer, the fiber composite material layer and the intermediate layer. The intermediate layer of the first housing also includes a reinforcing insert with a second locking hole. The first housing is connected to the second housing through the second locking hole.

31. The battery device according to claim 30, characterized in that, At least one of the reinforcing plate and the reinforcing insert is a metal component.

32. The battery device according to claim 31, characterized in that, The intermediate layer includes a metal component and a foam component, with the metal component connected to the foam component.

33. The battery device according to claim 32, characterized in that, The battery device includes a battery cell assembly, which includes a plurality of battery cells stacked along a first direction. The housing assembly includes end walls and mounting areas. The end walls are located at both ends of the battery cell assembly along the first direction. The metal component includes a reinforcing plate, a reinforcing block, and a reinforcing profile. The reinforcing block and the reinforcing profile are connected to the reinforcing plate. The bottom wall of the first receiving cavity is provided with the reinforcing plate. The end wall is provided with the reinforcing profile. The mounting area is provided with the reinforcing block, and at least a portion of the reinforcing block forms a first locking hole.

34. The battery device according to any one of claims 1 to 7, characterized in that, An adhesive layer is provided between the intermediate layer and the outer covering layer; and / or, The intermediate layer is a one-piece structure.

35. The battery device according to any one of claims 1 to 7, characterized in that, The insulating structure layer includes a first fiber fabric, and the fiber composite material layer includes a second fiber fabric. The first fiber fabric includes multiple second fibers, and the second fiber fabric includes multiple third fibers, wherein the second fibers are different from the third fibers.

36. The battery device according to claim 35, characterized in that, The second fiber includes at least one of glass fiber, basalt fiber, and aramid fiber; and / or, The third fiber includes at least one of carbon fiber and polyethylene fiber.

37. The battery device according to claim 35, characterized in that, The number of layers of the first fiber fabric in the insulating structure layer is 1-3; and / or, The second fiber fabric in the fiber composite layer has 2-15 layers.

38. The battery device according to any one of claims 1 to 7, characterized in that, The insulating structural layer includes a second substrate and a plurality of second fibers, at least a portion of which are interwoven. The second fibers include at least one of glass fiber, basalt fiber, and aramid fiber. The second substrate includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin; and / or, The fiber composite material layer includes a third substrate and a plurality of third fibers, at least a portion of which intersect each other, and the third fibers include at least one of carbon fiber and polyethylene fiber; the third substrate includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin and ceramizable resin.

39. The battery device according to any one of claims 1 to 7, characterized in that, The thickness of the insulating structural layer is less than or equal to the thickness of the fiber composite material layer; and / or, The thickness of the insulating structure layer is in the range of 0.1 mm to 1.0 mm, and the thickness of the fiber composite material layer is in the range of 1.0 mm to 2.5 mm.

40. An electrical device, characterized in that, Includes the battery device according to any one of claims 1 to 39.

41. The electrical appliance according to claim 40, characterized in that, The electrical equipment includes aircraft.

Images