Battery device and electric equipment

Abstract

The embodiment of the utility model provides a battery device and electric equipment. The battery device comprises a battery monomer group, a box body assembly and a fiber composite pulling plate, the battery monomer group comprises a plurality of battery monomers, the plurality of battery monomers are stacked along a first direction, the box body assembly is used for limiting an accommodating cavity, the battery monomer group is arranged in the accommodating cavity, the fiber composite material pulling plate comprises a main body part and connecting parts, and the connecting parts are respectively positioned at two ends of the main body part along the first direction; the box body assembly comprises two side beams which are oppositely arranged in the first direction, the two side beams are used for restraining the battery monomer group, and the connecting part is connected to the side beams. According to the battery device disclosed by the embodiment of the invention, the fiber composite material pulling plate is arranged, the fiber composite material pulling plate and the side beams can share the expansive force of the battery monomers together, so that the modulus and the strength of the box body assembly are improved, and the fiber composite material pulling plate is made of a fiber composite material, so that the weight of the battery device is reduced while the structural strength of the box body assembly is improved; the energy density of the battery device is improved.

Description

Technical Field

[0001] The embodiments of this application relate to the field of battery technology, and more particularly to a battery device and an electrical appliance. 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 electrical devices equipped with battery devices, the battery device typically accounts for a significant portion of the total weight, thus meeting the lightweight requirements of these devices. Therefore, how to improve the structural strength of the battery device while reducing its weight and increasing its energy density to meet the lightweight requirements of electrical devices 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 electrical equipment with high structural strength, low weight, and high energy density.

[0005] A first aspect of this application provides a battery device, the battery device comprising: a battery cell assembly including a plurality of battery cells stacked along a first direction; a housing assembly defining a receiving cavity, the battery cell assembly disposed in the receiving cavity; and a fiber composite sheet comprising a main body and a connecting portion, the connecting portion being located at both ends of the main body along the first direction; wherein the housing assembly includes two side beams disposed opposite to each other along the first direction, the two side beams constraining the battery cell assembly, and the connecting portion being connected to the side beams.

[0006] In the battery device of this application embodiment, a fiber composite tension plate is provided. The connecting portions at both ends of the fiber composite tension plate along the first direction are connected to the side beams of the housing assembly, so that part of the expansion force borne by the side beams can be transferred to the fiber composite tension plate. In other words, the fiber composite tension plate can share the expansion force of the battery cells with the side beams, thereby improving the modulus and strength of the housing assembly, especially improving the modulus of the housing assembly along the first direction, and reducing the probability of bending deformation of the side beams and / or reducing the amount of deformation when bending deformation occurs. Furthermore, the fiber composite tension plate is made of fiber composite material, which is lightweight and has high strength. This is beneficial for improving the structural strength of the housing assembly while reducing the weight of the battery device and increasing the energy density of the battery device.

[0007] In some embodiments, the housing assembly includes a first wall on which the battery cells are supported, and the side beams are connected to opposite ends of the first wall along the first direction; the fiber composite pull plate includes at least one first pull plate that covers at least a portion of the terminal posts of the battery cell group from the side of the battery cell group away from the first wall.

[0008] In this embodiment, the first pull plate covers the terminal side of the battery cell assembly from the side of the battery cell assembly away from the first wall, and can provide a limit for the battery cell assembly in the thickness direction (i.e., the third direction) of the first wall so as to fix the battery cell assembly to the housing assembly. The first pull plate can also resist the expansion force of the battery cell along the thickness direction (i.e., the third direction) of the first wall.

[0009] In some embodiments, the first pull plate forms an insulating layer on the side facing the battery cell.

[0010] In this embodiment, since the first pull plate may come into direct or indirect contact with the battery cell, an insulating layer is formed on the side of the first pull plate facing the battery cell, thereby improving the reliability of the battery device.

[0011] In some embodiments, the battery device further includes a busbar located between the battery cell group and the first pull plate, the first pull plate being bonded to the busbar.

[0012] In this embodiment, the busbar is bonded to the first pull plate, which helps to improve the connection strength and connection area between the first pull plate and the battery cell assembly. On the other hand, the first pull plate can also insulate the busbar from the external space, thereby improving the insulation performance of the battery device. The first pull plate can also provide protection for the busbar, reducing the possibility of the busbar cracking due to deformation or disconnecting from the battery cell.

[0013] In some embodiments, the battery device further includes a sampling component located between the first pull plate and the battery cell group, the sampling component having at least one output element, the first pull plate having an avoidance notch, the avoidance notch being positioned corresponding to the output element.

[0014] In this embodiment, the avoidance gap can avoid the output component, improve the structural compactness of the housing assembly, and optimize the stress distribution of the first pull plate, thereby improving its structural strength.

[0015] In some embodiments, the side beam is formed with at least one clearance groove, and the output member is at least partially located within the clearance groove.

[0016] In this embodiment, by forming at least one clearance groove in the side beam, the arrangement requirements of the sampling component in the battery device can be met, the output component can be easily connected to the external controller, and the structural compactness of the housing component can be improved, saving the internal space of the housing component.

[0017] In some embodiments, the first pull plate is connected to the side of the side beam opposite to the battery cell along the first direction, and the battery device includes a mounting bracket for mounting electrical components, the mounting bracket being connected to the first pull plate on the side of the side beam opposite to the first direction.

[0018] In this embodiment, the connecting part of the first pull plate and the mounting bracket are both located outside the receiving cavity of the housing assembly. This helps to save internal space of the housing assembly and improve the energy density of the battery device.

[0019] In some embodiments, a plurality of the battery cell groups are arranged along a second direction to form a battery cell array, the second direction intersecting the first direction; the fiber composite sheet includes at least one second sheet, the second sheet covering at least a portion of the battery cell array along the second direction.

[0020] In this embodiment, the second pull plate can cover at least a portion of the battery cell array along the second direction, thereby bearing the expansion force of the battery cells along the second direction, further improving the modulus and strength of the housing assembly along the second direction, and the second pull plate is connected to the side beam, which can further improve the deformation constraint force on the side beam, thereby further improving the structural strength of the housing assembly.

[0021] In some embodiments, the housing assembly includes a first wall on which the battery cells are supported, and the plurality of side walls include two side plates disposed at opposite ends of the first wall along a second direction. The side plates are used to constrain the battery cell assembly, and a second pull plate is located on the side of the side plate opposite to the first wall along the thickness direction of the first wall.

[0022] It is understandable that if only second pull plates are provided on both sides of the battery cell array along the second direction without side plates, the second pull plates would need to be quite thick to provide constraint for the battery cell assembly, leading to increased cost and weight. If only side plates are provided on both sides of the battery cell array along the second direction without second pull plates, the side plates might require a larger volume (e.g., the top surface of the side plate might need to be flush with the top surface of the battery cell), similarly leading to increased cost and weight. In this embodiment, the second pull plates and side plates cooperate to jointly constrain the battery cell assembly. Thus, while meeting the structural strength requirements of the housing assembly, the weight and manufacturing cost of the housing assembly can be reduced as much as possible, while increasing energy density.

[0023] In some embodiments, the side beam includes a laminated insulating structure layer and a fiber composite material layer, with at least a portion of the insulating structure layer located between the fiber composite material layer and the battery cell.

[0024] In this embodiment, the side beam includes an insulating structural layer and a fiber composite material layer stacked together. The fiber composite material layer provides good structural strength, and the insulating structural layer is located between the fiber composite material layer and the battery cell. The insulating structural layer not only supports the battery cell, but also electrically isolates the battery cell from the outside world, reducing external interference to the battery cell. The combination of the insulating structural layer and the fiber composite material layer allows the housing assembly to take into account both structural strength and protective performance.

[0025] In some embodiments, the side beam is configured as a hollow structure with a hollow cavity located between the insulating structural layer and the fiber composite material layer of the sidewall.

[0026] The technical solution of this application embodiment, by setting a hollow cavity, can effectively reduce the weight of the side beams, which is beneficial to the lightweighting of the housing components. Furthermore, the hollow cavity can also serve as a heat insulation layer, improving the thermal management performance of the battery device. The structure of the hollow cavity can be flexibly configured to adapt to different design requirements.

[0027] In some embodiments, the side beam further includes a support structure located in the hollow cavity and abutting against at least one of the insulating structural layer and the fiber composite material layer of the sidewall.

[0028] In this embodiment, a support structure is provided inside the hollow cavity. The support structure provides support for the insulation layer and the fiber composite material layer, which can improve the deformation resistance of the insulation layer and the fiber composite material layer. The support structure can also disperse impacts and improve the structural stability of the box assembly.

[0029] In some embodiments, the support structure includes a first support body, the first support body including a support plate having a support surface facing the insulating structural layer, the first direction being the thickness direction of the support plate, along the first direction, the support surface of the support plate abutting against the insulating structural layer.

[0030] In this embodiment, the first support includes a support plate. The support surface of the support plate abuts against the insulating structure layer, providing good support for the insulating structure layer. The abutment direction of the support plate is along the first direction, which can effectively limit the deformation of the battery cell caused by the expansion force in the first direction and improve the structural stability of the housing assembly.

[0031] In some embodiments, the housing assembly includes a first wall, the battery cell is supported on the first wall, and the first support further includes an extension plate connected to the support plate. The extension plate is connected to the side of the support plate facing the battery cell and extends along the first direction. The extension plate is connected to the first wall and projects onto the same projection plane along the thickness direction of the first wall. The projection of the extension plate overlaps with the projection of at least a portion of the battery cell.

[0032] In this embodiment, the extension plate can, on the one hand, jointly support the battery cells with the first wall, enhancing the support capacity of the housing assembly; on the other hand, the extension plate helps to balance the force on the support plate, reducing the probability of the support plate tilting and deforming, thereby improving the deformation resistance of the side beam and meeting the expansion resistance requirements of the side beam.

[0033] In some embodiments, the first support includes a reinforcing structure disposed on the side of the support plate opposite to the battery cell.

[0034] In this embodiment, by providing a reinforcing structure on the side of the support plate away from the battery cell along the first direction, the structural strength of the support plate can be further improved, thereby enhancing the deformation resistance of the side beam.

[0035] In some embodiments, the support structure further includes a second support body located between the support plate and the fiber composite material layer, the second support body including a foam layer; or, the second support body is configured as a fiber composite material shell with an opening at at least one end, the opening facing the support plate.

[0036] In this embodiment, the second support enhances the structural strength of the side beam and can also cooperate with other support structures of the side beam to further improve its structural strength. The second support formed by the foam layer can mitigate impact, providing good support, and is lightweight, facilitating the weight reduction of the box structure. The second support formed by the fiber composite shell has good structural strength and can also provide thermal insulation and corrosion resistance properties depending on the matrix phase. The open cavity can reduce weight, facilitating the weight reduction of the box structure.

[0037] In some embodiments, the fiber composite sheet includes a bending portion that connects the main body portion and the connecting portion. The connecting portion is connected to one side surface of the side beam along the first direction, and an adhesive is disposed between the connecting portion and the side beam.

[0038] In this embodiment, the connecting portion of the fiber composite sheet is bent relative to the main body to connect to one side surface of the side beam along the first direction. This helps to increase the connection area between the connecting portion and the side beam, allowing the expansion force borne by the side beam along the first direction to be better transferred to the fiber composite sheet, thereby further improving the modulus and strength of the housing along the first direction. Furthermore, the connecting portion of the fiber composite sheet is fixed to the side beam by adhesive bonding. This minimizes or at least reduces the number of holes drilled in the fiber composite layer and / or insulation layer of the side beam, improving the sealing performance and structural strength of the side beam.

[0039] In some embodiments, the connecting portion is connected to the side surface of the side beam facing away from the battery cell along the first direction.

[0040] In this embodiment, the connecting part is connected to the side surface of the side beam that is away from the battery cell pack along the first direction, rather than the side surface that faces the battery cell pack. This helps to preferentially transfer the expansion force to the side beam (which has higher strength in comparison), and also helps to save internal space of the housing assembly and increase energy density.

[0041] In some embodiments, the connecting portion has a first positioning structure, the side beam has a second positioning structure, and the first positioning structure and the second positioning structure are connected in cooperation.

[0042] In this embodiment, the first positioning structure and the second positioning structure can position and pre-fix the connecting part and the side beam before the colloid between the connecting part and the side beam is completely cured, reducing the possibility of the connecting part and the side beam shifting to each other before the colloid is cured, thereby improving the positioning accuracy and connection strength of the connecting part and the side beam and reducing the assembly difficulty.

[0043] In some embodiments, one of the first positioning structure and the second positioning structure is a hole structure and the other is a protrusion structure, with the protrusion structure located within the hole structure; or both the first positioning structure and the second positioning structure are hole structures, with an external connecting structure passing through the first positioning structure and the second positioning structure.

[0044] In this embodiment, the first positioning structure and the second positioning structure can improve the positioning accuracy and reduce the possibility of mutual displacement between the connecting part and the side beam after the first positioning structure and the second positioning structure are connected.

[0045] In some embodiments, the housing assembly includes a first wall on which the battery cell is supported. The first wall includes a laminated insulating structure layer and a fiber composite material layer, wherein the insulating structure layer is located between the fiber composite material layer and the battery cell along the thickness direction of the first wall.

[0046] In this embodiment, the insulating structure layer serves not only to support the battery cells but also to electrically isolate the battery cells from the outside world, reducing external interference to the battery cells. The combination of the insulating structure layer and the fiber composite material layer helps the housing assembly to balance structural strength and protective performance.

[0047] In some embodiments, the fiber composite sheet is connected to the housing of the battery cell.

[0048] In this embodiment, the fiber composite sheet is connected to the battery cell housing, which helps to improve the constraint force of the fiber composite sheet on the battery cell.

[0049] In some embodiments, an adhesive layer is provided on the side of the main body facing the battery cell.

[0050] In this embodiment, it helps to improve the connection strength between the fiber composite sheet and the battery cell casing and reduce the connection difficulty.

[0051] In some embodiments, the fiber composite sheet further includes a bending portion connecting the main body and the connecting portion, wherein the thickness of the bending portion is greater than at least a portion of the thickness of the main body.

[0052] It is understandable that the bending part is subjected to more complex forces than the main body. Therefore, in this embodiment, the bending part is thickened to increase its modulus and strength, thereby improving the overall structural strength.

[0053] In some embodiments, the fiber composite sheet includes a first substrate and a first fiber, wherein the first fiber is a continuous fiber and extends along the first direction in the main body portion.

[0054] In this embodiment, the first fiber in the fiber composite sheet is configured to extend along a first direction, which can improve the modulus and strength of the fiber composite sheet along the first direction, thereby improving the modulus and strength of the housing assembly along the first direction.

[0055] In some embodiments, the first fiber extends from one of the connecting portions to the other connecting portion.

[0056] In this embodiment, the main body and the connecting part are actually formed as an integral structure, which helps to further improve the structural strength of the fiber composite sheet.

[0057] In some embodiments, the first substrate includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin; and / or the first fiber includes at least one of glass fiber, basalt fiber, and aramid fiber.

[0058] The technical solution of this application embodiment is that the fiber composite material formed by the first substrate and the first fiber has the characteristics of being lightweight and high-strength, which is beneficial to reducing the weight of the fiber composite sheet and improving the structural strength of the fiber composite sheet.

[0059] In some embodiments, the fiber composite sheet includes a second fiber, which is a woven fiber, and the second fiber and the first fiber are stacked together along the thickness direction of the composite sheet.

[0060] In this embodiment, the fiber composite sheet includes both a first fiber and a second fiber. The first fiber is a continuous fiber extending in one direction, and the second fiber is a woven fiber, thereby improving the structural strength of the fiber composite sheet.

[0061] In some embodiments, the fiber composite sheet includes a bent portion connecting the main body and the connecting portion, and the second fiber is disposed at least at a position corresponding to the bent portion.

[0062] As mentioned above, the stress on the bending part is relatively complex. Therefore, in this embodiment, a second fiber is provided at the position corresponding to the bending part. Since the second fiber is a braided fiber, it can improve the modulus and strength of the bending part in multiple directions, thereby improving the structural strength of the fiber composite sheet.

[0063] In some embodiments, the second fiber includes at least one of glass fiber, basalt fiber, and aramid fiber.

[0064] In this way, the structural strength of the fiber composite sheet is improved while its insulation performance is also enhanced.

[0065] In some embodiments, a plurality of battery cell groups are arranged along a second direction to form a battery cell array, the second direction intersecting the first direction; the fiber composite sheet includes at least one third sheet, the third sheet being disposed between two adjacent battery cell groups and covering at least a portion of the battery cell groups along the second direction.

[0066] In this embodiment, the third pull plate can further enhance the modulus and strength of the housing assembly along the first direction, and can also constrain the battery cell group along the second direction and resist the expansion force of the battery cell along the second direction.

[0067] In some embodiments, the housing assembly includes a first wall, the battery cell is supported on the first wall, and the third pull plate is connected to the first wall.

[0068] In this embodiment, the third pull plate is connected to the first wall, which helps to improve the overall integrity of the box assembly and thus improve the structural strength of the box assembly.

[0069] In some embodiments, the maximum distance between the third pull plate and the first wall is greater than or equal to the maximum distance between the shoulder of the battery cell and the first wall.

[0070] In this embodiment, it helps to provide constraints and support for the battery cells along the entire length of the battery cell height direction, thereby improving the structural strength of the housing assembly.

[0071] In some embodiments, the side beam, the first wall, and the third tie plate are formed as an integral structure.

[0072] In this embodiment, by forming the side beam, the first wall, and the third tie plate into an integral structure, the connection strength between the side beam and the first wall, as well as the connection strength between the third tie plate and the first wall, and between the third tie plate and the side beam, can be improved, thereby enhancing the structural strength of the box assembly.

[0073] A second aspect of the present disclosure provides an electrical device that includes a battery device according to a first aspect of the present disclosure.

[0074] The electrical device of this disclosure has all the beneficial effects of the battery device described in any of the above embodiments, and will not be repeated here.

[0075] In some embodiments, the electrical equipment includes an aircraft. Attached Figure Description

[0076] Figure 1 This is a schematic diagram of the structure of the electrical equipment (aircraft) according to an embodiment of this application;

[0077] Figure 2 This is an exploded perspective view of the battery device according to an embodiment of this application;

[0078] Figure 3 This is a schematic diagram of one side structure of the battery device provided in the embodiments of this application;

[0079] Figure 4 for Figure 3 A schematic diagram of the other side of the battery device;

[0080] Figure 5 for Figure 3 A schematic diagram of the structure on another side of the battery device;

[0081] Figure 6 for Figure 3 Explosion diagram of the battery device;

[0082] Figure 7 This is an exploded view of the housing assembly according to an embodiment of this application;

[0083] Figure 8 This is a cross-sectional structural diagram of the side beam according to an embodiment of this application;

[0084] Figure 9 This is a schematic diagram of the structure of the first pull plate according to an embodiment of this application;

[0085] Figure 10 for Figure 9 A schematic diagram of the AA cross-section;

[0086] Figure 11 for Figure 10 Enlarged schematic diagram of part B in the middle;

[0087] Figure 12 This is a schematic diagram showing the cooperation relationship between the third pull plate and the housing assembly in an embodiment of this application.

[0088] Explanation of reference numerals in the attached figures

[0089] 1000, Aircraft; 100, Battery Unit; 1, Battery Cell Array; 10, Battery Cell Group; 11, Battery Cell; 111, Pressure Relief Mechanism; 112, Terminal Post; 2, Housing Assembly; 2a, Insulation Structure Layer; 2b, Fiber Composite Material Layer; 21, Side Beam; 21a, Clearance Groove; 21b, Second Positioning Structure; 211, Hollow Cavity; 212, Support Structure; 213, First Support Body; 2131, Support Plate; 2132, Extension Plate; 2133, Reinforcing Structure; 214, Second Support Body; 22, First Wall; 23, Side Plate; 3, Fiber Composite Material Pull Plate; 3a, Main Body; 3b, Connecting Part; 3c, Bending Part; 3d, First Positioning Structure; 31, First Pull Plate; 31a, Clearance Notch; 32, Second Pull Plate; 33, Third Pull Plate; 200, Airframe; 4, Busbar; 5, Sampling Assembly; 51, Output Component. Detailed Implementation

[0090] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0091] The specific technical features described in the specific embodiments can be combined in any suitable manner without contradiction. For example, different combinations of specific technical features can form different embodiments and technical solutions. To avoid unnecessary repetition, the various possible combinations of the specific technical features in this application will not be described separately.

[0092] In the following description, the terms "first," "second," etc., are used merely to distinguish different objects and do not indicate that the objects have the sameness or relationship. It should be understood that the directional descriptions "above," "below," "outside," and "inside" refer to the orientation under normal use conditions, while "left" and "right" refer to the left and right directions shown in the corresponding diagrams, which may or may not be the left and right directions under normal use conditions.

[0093] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. "A plurality of" means two or more.

[0094] In the description of this application, the orientation or positional relationship of "first direction", "second direction" and "third direction" are based on the orientation or positional relationship shown in the accompanying drawings. Among them, "first direction" is the direction indicated by arrow L1 in the accompanying drawings, "second direction" is the direction indicated by arrow L2 in the accompanying drawings, and "third direction" is the direction indicated by arrow L3 in the accompanying drawings. It should be understood that these orientation terms are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0095] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0096] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0097] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0098] 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.

[0099] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0100] In some embodiments, a battery cell assembly is typically formed by an array of multiple battery cells.

[0101] As an example, a battery cell assembly can be a battery module, which consists of multiple battery cells arranged and fixed together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0102] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0103] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0104] As an example, battery cell assemblies can also be housed within a housing by directly fixing multiple battery cells to the housing. As an example, the housing may include a first housing and a second housing. The first and second housings are fastened together to form a closed space inside the housing for accommodating the battery cell assemblies. Here, "closed" refers to covering or shutting off; it can be sealed or not sealed. The first housing may be a top cover or a bottom plate.

[0105] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0106] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle / aircraft's floor, or a portion of the housing may be at least a part of the vehicle / aircraft's crossbeams and longitudinal beams.

[0107] In this embodiment of the application, 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.

[0108] 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 of this application are not limited to this.

[0109] 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.

[0110] In some embodiments, a 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.

[0111] 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 application does not have any particular limitations.

[0112] 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 be provided with one or more.

[0113] 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.

[0114] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and aircraft.

[0115] 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.

[0116] In related technologies, the enclosure is made of metal, which has problems such as large weight, poor insulation and protection performance, complex structure, and the need to weld multiple structures together, which may not meet the lightweight requirements of some electrical equipment.

[0117] In view of this, embodiments of this application provide a battery device, which includes a battery cell assembly, a housing assembly, and a fiber composite sheet. The battery cell assembly includes multiple battery cells stacked along a first direction. The housing assembly defines a receiving cavity, in which the battery cell assembly is disposed. The fiber composite sheet includes a main body and a connecting portion, which are located at opposite ends of the main body along the first direction. The housing assembly includes two side beams disposed opposite each other along the first direction, which constrain the battery cell assembly. The connecting portion is connected to the side beams.

[0118] In the battery device of this application embodiment, a fiber composite tension plate is provided. The connecting portions at both ends of the fiber composite tension plate along the first direction are connected to the side beams of the housing assembly, so that part of the expansion force borne by the side beams can be transferred to the fiber composite tension plate. In other words, the fiber composite tension plate can share the expansion force of the battery cells with the side beams, thereby improving the modulus and strength of the housing assembly, especially improving the modulus of the housing assembly along the first direction, and reducing the probability of bending deformation of the side beams and / or reducing the amount of deformation when bending deformation occurs. Furthermore, the fiber composite tension plate is made of fiber composite material, which is lightweight and has high strength. This is beneficial for improving the structural strength of the housing assembly while reducing the weight of the battery device and increasing the energy density of the battery device.

[0119] The technical solutions described in the embodiments of this application are applicable to electrical devices that use battery devices. The electrical devices include the battery devices of any embodiment of this application, and the battery devices are used to provide electrical energy.

[0120] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, aircraft, 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. Aircraft generally refer to devices that fly within or outside the atmosphere (space), including aircraft flying within the atmosphere and spacecraft flying in space. Aircraft can include airplanes, airships, etc., 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, 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 aforementioned electrical equipment.

[0121] It should be noted that the technical solutions described in the embodiments of this application 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. However, for the sake of brevity, the following embodiments are all described using aircraft as an example.

[0122] Reference Figure 1 The aircraft 1000 typically includes a battery unit 100 and an airframe, with the battery unit 100 located in the airframe and providing electrical power to the airframe.

[0123] Reference 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 device 100. 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 the multiple battery cells 11 is housed within a housing. 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 modules, and then multiple modules connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within a housing assembly.

[0124] Reference Figures 3-12 This application provides a battery device 100, which includes a battery cell assembly 10, a housing assembly 2, and a fiber composite pull plate 3. The battery cell assembly 10 includes a plurality of battery cells 11 stacked along a first direction. The housing assembly 2 defines a receiving cavity in which the battery cell assembly 10 is disposed. The fiber composite pull plate 3 includes a main body portion 3a and a connecting portion 3b, which are located at opposite ends of the main body portion 3a along the first direction. The housing assembly 2 includes two side beams 21 arranged opposite each other along the first direction, which constrain the battery cell assembly 10. The connecting portion 3b is connected to the side beams 21.

[0125] The box assembly 2 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.

[0126] The housing assembly 2 defines a receiving cavity in which the battery cell pack 10 is disposed. The battery cell pack 10 is then mounted to the electrical equipment via the housing assembly 2. As an example, the housing assembly 2 is typically a cuboid structure. Both the length and width directions of the housing assembly 2 are parallel to the horizontal plane, and the length direction of the housing assembly 2 is parallel to the longest side of its cuboid structure. The height direction of the housing assembly 2 is perpendicular to the ground.

[0127] The battery cell group 10 includes a plurality of battery cells 11 stacked along a first direction. The battery device 100 may include only one battery cell group 10 or multiple battery cell groups 10. The multiple battery cell groups 10 are distributed along a second direction to form a battery cell array 1.

[0128] Here, the first direction and the second direction intersect. Taking the box assembly 2 as a cuboid as an example, one of the first direction and the second direction can be the length direction of the box assembly 2, and the other can be the width direction of the box assembly 2.

[0129] As an example, the large surface of the battery cell 11 is perpendicular to the first direction, and the large surfaces of adjacent battery cells 11 in the battery pack are directly or indirectly connected along the first direction. Specifically, the large surface here refers to the surface with the largest area among all the surfaces of the battery cell 11.

[0130] The housing assembly 2 includes two side beams 21 arranged opposite each other along a first direction. The side beams 21 are specifically used to constrain the battery cell group 10 and bear the expansion force from the battery cells 11. The side beams 21 may directly or indirectly abut against the battery cells 11, or a gap may be formed between the side beams 21 and the battery cells 11, which is not limited.

[0131] As an example, in addition to the side beams 21, the housing assembly 2 may also include a first wall 22, with the two side beams 21 respectively connected to opposite ends of the first wall 22 along a first direction.

[0132] The first wall 22 is used to support the battery cell 11. Specifically, "supporting" here means bearing the weight of the battery cell 11; that is, the first wall 22 is located on the bottom side of the battery cell 11 along the direction of gravity. The thickness direction of the first wall 22 is the third direction. Taking the housing assembly 2 as an example of a cuboid structure, the third direction is the height direction of the housing assembly 2, which is also the height direction of the battery cell 11. In some embodiments, the first direction, the second direction, and the third direction are perpendicular to each other.

[0133] Furthermore, the housing assembly 2 may also include two side plates 23 disposed opposite to each other along the second direction. The two side plates 23 are respectively connected to the opposite ends of the first wall 22 along the second direction, and the opposite ends of the side beam 21 along the second direction are respectively connected to the two side plates 23. The side plates 23 are specifically used to constrain the battery cell pack 10 along the second direction.

[0134] The battery device 100 also includes a fiber composite tension plate 3, which includes a main body 3a and a connecting part 3b. The connecting part 3b is located at both ends of the main body 3a along the first direction and is connected to the side beam 21.

[0135] Here, fiber composite sheet 3 specifically refers to a structure in which at least a portion of the fiber composite sheet 3 is made of fiber composite material.

[0136] As an example, the fiber composite material of the fiber composite plate 3 includes a reinforcing phase and a matrix phase. The matrix phase bonds the reinforcing phase together, making the reinforcing phase and matrix phase form 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, thereby enhancing its mechanical properties.

[0137] The reinforcing phase includes fibers selected from at least one of glass fibers, basalt fibers, and aramid fibers, while the matrix phase includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin. This gives the fiber composite sheet 3 good structural strength and insulation properties (the fiber composite sheet 3 may directly or indirectly contact the battery cell 11). In some examples, at least a portion of the fibers in the fiber composite material of the fiber composite sheet 3 are continuous fibers, and in the main body 3a, the fibers extend along a first direction; that is, at least a portion of the fibers in the fiber composite sheet 3 are formed as unidirectional bands, thereby improving the structural strength of the fiber composite sheet 3 along the first direction.

[0138] The main body 3a may be the portion that contacts the fiber composite tension plate 3 with the battery cell 11 and / or limits the position of each battery cell 11 in the battery cell group 10. The main body 3a may be in direct or indirect contact with the battery cell 11. Alternatively, the main body 3a may not be in contact with the battery cell 11.

[0139] One or more surfaces of the battery cell pack 10 may be provided with the main body portion 3a. Here, the surface of the battery cell pack 10 may be a surface that is away from the first wall 22 along the first direction, or it may be a surface along the first direction or the second direction.

[0140] As an example, the surface of the battery cell assembly 10 facing away from the first wall 22 and the surface of the battery cell assembly 10 along the second direction are both provided with a main body portion 3a.

[0141] The connecting part 3b is the part that connects the fiber composite pull plate 3 to the box assembly 2. The connection between the connecting part 3b and the box assembly 2 can be welding, bonding, threaded connection, snap-fit, riveting, etc.

[0142] The connecting part 3b can be connected to any position of the side beam 21, such as the side of the side beam 21 facing the battery cell 11 in the first direction, the side of the side beam 21 away from the battery cell 11 in the first direction, the side of the side beam 21 away from the first wall 22 in the third direction, etc.

[0143] In the battery device 100 of this embodiment, a fiber composite tension plate 3 is provided. The connecting portions 3b at both ends of the fiber composite tension plate 3 along the first direction are connected to the side beams 21 of the housing assembly 2, so that part of the expansion force borne by the side beams 21 can be transmitted to the fiber composite tension plate 3. In other words, the fiber composite tension plate 3 can share the expansion force of the battery cell 11 with the side beams 21, thereby improving the modulus and strength of the housing assembly 2, especially improving the modulus of the housing assembly 2 along the first direction, and reducing the probability of bending deformation of the side beams 21 and / or reducing the amount of deformation when bending deformation occurs. Furthermore, the fiber composite tension plate 3 is made of fiber composite material, which is lightweight and has high strength. This is beneficial for improving the structural strength of the housing assembly 2 while reducing the weight of the battery device 100 and increasing the energy density of the battery device 100.

[0144] In some embodiments, refer to Figure 2 and Figure 6 The housing assembly 2 includes a first wall 22, on which battery cells 11 are supported, and side beams 21 are connected to opposite ends of the first wall 22 along a first direction. The fiber composite pull plate 3 includes at least one first pull plate 31, which covers at least a portion of the terminal posts 112 of the battery cell assembly 10 from the side opposite to the first wall 22.

[0145] It should be noted that the first pull plate 31 covering the battery cell group 10 can be a part of the battery cell group 10 covered by the first pull plate 31, that is, when projected along a third direction, the projection of the first pull plate 31 overlaps with the projection of the battery cell group 10; or the first pull plate 31 covering the entire battery cell group 10, that is, when projected along a third direction, the projection of the first pull plate 31 overlaps with the projection of the battery cell group 10 as a whole.

[0146] Furthermore, the first pull plate 31 can cover one or more battery cell groups 10. In some examples, the housing assembly 2 is provided with multiple battery cell groups 10, which are distributed along the second direction to form a battery cell array 1. Adjacent battery cell groups 10 in the battery cell array 1 share a first pull plate 31. Alternatively, in other examples, the first pull plate 31 partially or completely covers a single battery cell group 10.

[0147] In this embodiment, the first pull plate 31 covers the terminal post 112 side of the battery cell assembly 10 from the side away from the first wall 22, and can provide a limit for the battery cell assembly 10 in the thickness direction (i.e., the third direction) of the first wall 22 so as to fix the battery cell assembly 10 to the housing assembly 2. The first pull plate 31 can also resist the expansion force of the battery cell 11 along the thickness direction (i.e., the third direction) of the first wall 22.

[0148] In some embodiments, the first pull plate 31 forms an insulating layer on the side facing the battery cell 11.

[0149] Here, the fibers and substrates used in the fiber composite material of the fiber composite plate 3 can be insulating materials. For example, the fibers are selected from glass fiber, basalt fiber, aramid fiber, etc., and the substrates are selected from polyurethane, epoxy resin, phenolic resin, polyamide resin, ceramicizable resin, etc., so that the fiber composite plate 3 is formed as an insulating structure, thereby forming an insulating layer on the side of the fiber composite plate 3 facing the battery cell 11.

[0150] Alternatively, the fibers used in the fiber composite material of the fiber composite sheet 3 can be non-insulating fibers, such as carbon fiber. The side of the fiber composite sheet 3 facing the battery cell 11 can form an insulating layer by coating with insulating materials, electroplating with insulating materials, or hot-pressing with insulating film.

[0151] Here, the side of the first pull plate 31 facing the battery cell 11 may include the main body 3a of the first pull plate 31 facing the battery cell 11, or it may include the connecting part 3b of the first pull plate 31 facing the battery cell 11.

[0152] In this embodiment, since the first pull plate 31 may come into direct or indirect contact with the battery cell 11, an insulating layer is formed on the side of the first pull plate 31 facing the battery cell 11, thereby improving the reliability of the battery device 100.

[0153] In some embodiments, refer to Figure 6 The battery device 100 also includes a busbar 4, which is located between the battery cell group 10 and the first pull plate 31, and the first pull plate 31 is bonded to the busbar 4.

[0154] Here, the busbar 4 can be used as a conductive component to electrically connect multiple battery cells 11, and to collect and transmit the current between the battery cells 11 to an external circuit, or to distribute the current input from the external circuit to each battery cell 11.

[0155] The busbar 4 can be made of rigid material or flexible material. The busbar 4 can be used for electrical connection of battery cells 11 in battery cell group 10, or to connect battery cells 11 in battery cell array 1 in a row.

[0156] In this embodiment, the busbar 4 is bonded to the first pull plate 31, which helps to improve the connection strength and connection area between the first pull plate 31 and the battery cell assembly 10. On the other hand, the first pull plate 31 can also insulate the busbar 4 from the external space, thereby improving the insulation performance of the battery device 100. The first pull plate 31 can also provide protection for the busbar 4, reducing the possibility of the busbar 4 cracking due to deformation or disconnecting from the battery cell 11.

[0157] In some embodiments, refer to Figure 4 , Figure 6 , Figure 9 The battery device 100 also includes a sampling component 5, which is located between the first pull plate 31 and the battery cell group 10. The sampling component 5 has at least one output component 51. The first pull plate 31 is provided with an avoidance notch 31a, which is positioned corresponding to the output component 51.

[0158] Here, the sampling component 5 can be used to detect parameters such as voltage, current, and temperature of the battery cell 11 or battery cell group 10. The output component 51 is used to electrically connect to an external controller, thereby outputting the data collected by the sampling component 5 to the external controller. The output component 51 can be a conductive post, conductive sheet, conductive wire, etc.

[0159] The first pull plate 31 includes a clearance notch 31a corresponding to the output member 51. The shape and position of the clearance notch 31a can be determined according to the specific shape and position of the output member 51. The clearance notch 31a can be a groove provided on the edge of the first pull plate 31 along the first direction, or it can be a hole opened in the first pull plate 31. The clearance notch 31a can be provided on the main body 3a and / or the connecting part 3b of the first pull plate 31.

[0160] In this embodiment, the avoidance notch 31a can avoid the output component 51, improve the structural compactness of the housing assembly 2, optimize the stress distribution of the first pull plate 31, and thus improve its structural strength.

[0161] In some embodiments, still refer to Figure 6 The side beam 21 has at least one clearance groove 21a, and the output member 51 is at least partially located in the clearance groove 21a.

[0162] Here, the specific position and shape of the clearance groove 21a can be determined according to the position and structure of the output member 51. It is only necessary to ensure that the output member 51 can extend through the clearance groove 21a to the side of the side beam 21 away from the receiving cavity.

[0163] In this embodiment, the side beam 21 may have one or more clearance grooves 21a. The clearance grooves 21a may correspond to a single output component 51 or multiple output components 51. In some examples, the side beam 21 is provided with multiple clearance grooves 21a along the second direction, and the clearance grooves 21a, output components 51 and battery cell packs 10 are correspondingly provided.

[0164] In this embodiment, by forming at least one clearance groove 21a in the side beam 21, the arrangement requirements of the sampling component 5 in the battery device 100 can be met, which facilitates the connection of the output component 51 with the external controller, and also improves the structural compactness of the housing component 2 and saves the internal space of the housing component 2.

[0165] In some embodiments, refer to Figure 6 The first pull plate 31 is connected to the side beam 21 on the side away from the battery cell 11 along the first direction. The battery device 100 includes a mounting bracket (not shown in the figure) for mounting electrical components. The mounting bracket is connected to the first pull plate 31 on the side away from the side beam 21 along the first direction.

[0166] The mounting bracket is used to mount electrical components. The specific structure of the electrical components is not limited, but specifically refers to components used to control the battery cell 11. As an example, the electrical component includes a circuit board on which a control unit, including but not limited to a cell supervision circuit (CSC), is integrated. The electrical component can be electrically connected to the busbar 4 and / or the sampling component 5.

[0167] In this embodiment, the connecting part 3b of the first pull plate 31 and the mounting bracket are both located outside the receiving cavity of the housing assembly 2. This helps to save the internal space of the housing assembly 2 and increase the energy density of the battery device 100.

[0168] In some embodiments, a plurality of battery cell groups 10 are arranged along a second direction to form a battery cell array 1, the second direction intersecting with a first direction; the fiber composite sheet 3 includes at least one second sheet 32, the second sheet 32 ​​covering at least a portion of the battery cell array 1 along the second direction.

[0169] Here, the second pull plate 32 covers at least a portion of the battery cell array 1 along the second direction. This can be a projection along the second direction, where the projection of the second pull plate 32 partially overlaps with the projection of the battery cell array 1; or, the projection of the second pull plate 32 completely overlaps with the projection of the battery cell array 1.

[0170] As an example, there are at least two second pull plates 32, which cover both sides of the battery cell array 1 along the second direction.

[0171] In this embodiment, the second pull plate 32 can cover at least a portion of the battery cell array 1 along the second direction, thereby bearing the expansion force of the battery cell 11 along the second direction, further improving the modulus and strength of the housing assembly 2 along the second direction, and the second pull plate 32 is connected to the side beam 21, which can further improve the deformation constraint force on the side beam 21, thereby further improving the structural strength of the housing assembly 2.

[0172] In some embodiments, refer to Figure 5 and Figure 6The housing assembly 2 includes a first wall 22, on which the battery cell 11 is supported. Multiple side walls include two side plates 23, which are disposed at opposite ends of the first wall 22 along a second direction. The side plates 23 are used to constrain the battery cell assembly 10. A second pull plate 32 is located on the side of the side plate 23 away from the first wall 22 along the thickness direction (i.e., the third direction) of the first wall 22.

[0173] As an example, along the third direction, one end of the second pull plate 32 near the side plate 23 is connected to the side plate 23, or, the end of the second pull plate 32 near the side plate 23 forms a gap with the side plate 23. In some examples, when projected onto the same projection plane along the second direction, the projection of the second pull plate 32 and the projection of the side plate 23 together cover the projection of the battery cell array 1.

[0174] It is understandable that if the battery cell array 1 only has the second pull plate 32 on both sides along the second direction without the side plate 23, the second pull plate 32 would need to have a large thickness to provide constraint force for the battery cell group 10, resulting in increased cost and weight. If the battery cell array 1 only has the side plate 23 on both sides along the second direction without the second pull plate 32, the side plate 23 might need a large volume (for example, the top surface of the side plate 23 might need to be flush with the top surface of the battery cell 11), which would also lead to increased cost and weight. In this embodiment, the second pull plate 32 and the side plate 23 cooperate to jointly constrain the battery cell group 10. In this way, while meeting the structural strength requirements of the housing assembly 2, the weight and manufacturing cost of the housing assembly 2 can be reduced as much as possible, and the energy density can be improved.

[0175] In some embodiments, refer to Figure 7 and Figure 8 The side beam 21 includes an insulating structure layer 2a and a fiber composite material layer 2b stacked together, with at least a portion of the insulating structure layer 2a located between the fiber composite material layer 2b and the battery cell 11.

[0176] Here, the insulating structure layer 2a and the fiber composite material layer 2b are stacked, specifically, both the insulating structure layer 2a and the fiber composite material layer 2b are plate-shaped structures. When projected along the thickness direction of the plate-shaped structure, the projections of the insulating structure layer 2a and the fiber composite material layer 2b overlap at least partially, so that the insulating structure layer 2a and the fiber composite material layer 2b are stacked together to form an integral laminate.

[0177] It should be noted that, in addition to the side beam 21, other structural walls of the enclosure (e.g., the first wall 22), structural beams, and structural panels (e.g., side panels 23) can also adopt similar structures. Taking the side beam 21 as an example, the insulating structural layer 2a and the composite material layer included in the side beam 21 can be integrally bonded together, or they can be partially connected, forming gaps or cavities in some locations. Furthermore, the side beam 21 can also include one or more laminates, or different wall surfaces of the side beam 21 can be formed by bending a laminate.

[0178] In this embodiment and in other embodiments mentioned below, the insulating structure layer 2a can be made of a single material, or it can be made of fiber composite material or other composite materials. The fiber composite material layer 2b is made of fiber composite material.

[0179] The main difference between the insulating structural layer 2a and the fiber composite layer 2b is that the insulating structural layer 2a is insulating at least on the side surface facing the battery cell 11, while the fiber composite layer 2b may be non-insulating, or it may be partially or completely insulating.

[0180] In an example where both the insulating structure layer 2a and the fiber composite material layer 2b are made of fiber composite materials, the fibers in the insulating structure layer 2a and the fiber composite material layer 2b can be the same, such as at least one of glass fiber, basalt fiber, aramid fiber, ceramic fiber, carbon fiber, and polyethylene fiber. In this embodiment, if the fibers in the fiber composite material layer 2b of the insulating structure layer 2a include carbon fiber or other conductive fibers, an insulating coating can be applied to the surface of the insulating structure layer 2a facing the battery cell 11 to achieve insulation.

[0181] The fibers in the insulating structural layer 2a and the fiber composite material layer 2b can also be different. For example, the fibers of the fiber composite material in the insulating structural layer 2a may include at least one of glass fiber, basalt fiber, and aramid fiber. All of these fibers are insulating fibers. Therefore, in this embodiment, the insulating structural layer 2a may not require an insulating coating. The fibers of the fiber composite material in the fiber composite material layer 2b may include at least one of carbon fiber and polyethylene fiber.

[0182] The insulating structure layer 2a is located between the fiber composite material layer 2b and the battery cell 11. That is, the insulating structure layer 2a is located on the side of the first wall 22 facing the battery cell 11. Specifically, the insulating structure layer 2a can be provided as a whole on the side of the first wall 22 facing the battery cell 11, or the insulating structure layer 2a can be provided only on a part of the side of the first wall 22 facing the battery cell 11. It can be understood that the insulating layer provided as a whole has a better insulation effect.

[0183] In this embodiment, the side beam 21 includes an insulating structural layer 2a and a fiber composite material layer 2b stacked together. The fiber composite material layer 2b provides good structural strength. The insulating structural layer 2a is located between the fiber composite material layer 2b and the battery cell 11. The insulating structural layer 2a is used to support the battery cell 11 and also to electrically isolate the battery cell 11 from the outside world, reducing external interference to the battery cell 11. The combination of the insulating structural layer 2a and the fiber composite material layer 2b allows the housing assembly 2 to take into account both structural strength and protective performance.

[0184] In some embodiments, the side beam 21 is configured as a hollow structure having a hollow cavity 211 (not shown in the figure); the hollow cavity 211 is located between the insulating structural layer 2a and the fiber composite material layer 2b of the side beam 21.

[0185] The hollow cavity 211 formed by the side beam 21 can be formed by multiple layers of the side beam 21 enclosing each other to form a hollow structure, or it can be formed by the insulating structure layer 2a and the fiber composite material layer 2b of the side beam 21 enclosing each other to form a hollow structure.

[0186] The technical solution of this application embodiment, by setting the hollow cavity 211, can effectively reduce the weight of the side beam 21, which is beneficial to the lightweighting of the housing assembly 2. In addition, the hollow cavity 211 can also serve as a heat insulation layer, improving the thermal management performance of the battery device 100. The structure of the hollow cavity 211 can be flexibly set to adapt to different design requirements.

[0187] In some embodiments, the side beam 21 further includes a support structure 212 located in the hollow cavity 211 and abutting against at least one of the insulating structural layer 2a and the fiber composite material layer 2b of the side beam 21.

[0188] The supporting structure 212 can be a columnar structure, a ribbed structure, a shell structure, a plate structure, a mesh structure, a honeycomb structure, a filled structure, etc. One or more supporting structures 212 can be provided in the hollow cavity 211.

[0189] The support structure 212 can abut against the insulating structure layer 2a, or against the fiber composite material layer 2b, or one side of the support structure 212 abuts against the insulating structure layer 2a, and the other side of the support structure 212 abuts against the fiber composite material layer 2b.

[0190] The support structure 212 can also be connected to the corresponding insulating structure layer 2a and fiber composite material layer 2b by means of snap-fit, bonding, welding, fastener connection, riveting, etc., thereby improving the connection strength.

[0191] In this embodiment, a support structure 212 is provided in the hollow cavity 211. The support structure 212 provides support for the insulation layer 2a and the fiber composite material layer 2b, which can improve the deformation resistance of the insulation layer 2a and the fiber composite material layer 2b. The support structure 212 can also disperse impacts and improve the structural stability of the box assembly 2.

[0192] In some embodiments, refer to Figure 7 and Figure 8 The support structure 212 includes a first support body 213, which has a support plate 2131 facing the insulating structure layer 2a. The first direction is the thickness direction of the support plate 2131, and the support plate 2131 abuts against the insulating structure layer 2a along the first direction.

[0193] The first support 213 is used to provide support along the first direction. The first support 213 can be a block structure, column structure, plate structure or a combination of multiple structures.

[0194] The first direction can be the direction perpendicular to the large surface area of ​​the battery cell 11. In some examples, the large surface area of ​​the battery cell 11 is relatively large, making it prone to thermal expansion and deformation. In this case, the first direction is the direction in which the expansion force of the battery cell 11 is greater. The first support 213 is used to limit the deformation of the battery cell 11 caused by the expansion force.

[0195] The support plate 2131 abuts against the insulating structure layer 2a, which can be partial abutment or the surface of one side of the support plate 2131 can be fully attached to the surface of the insulating structure layer 2a.

[0196] In some examples, the support plate 2131 can also be connected to the corresponding insulating structure layer 2a. The support plate 2131 and the corresponding insulating structure layer 2a can be connected by means of snap-fit, bonding, welding, fastener connection, riveting, etc.

[0197] In this embodiment, the first support 213 includes a support plate 2131. The support surface of the support plate 2131 abuts against the insulating structure layer 2a, providing good support for the insulating structure layer 2a. The abutting direction of the support plate 2131 is along the first direction, which can effectively limit the deformation of the battery cell 11 caused by the expansion force in the first direction and improve the structural stability of the housing assembly 2.

[0198] In some embodiments, still refer to Figure 7 and Figure 8The first support 213 also includes an extension plate 2132 connected to the support plate 2131. The extension plate 2132 is connected to the side of the support plate 2131 facing the battery cell 11 and extends along the first direction. The extension plate 2132 is connected to the first wall 22 and projects onto the same projection plane along the thickness direction of the first wall 22. The projection of the extension plate 2132 overlaps with the projection of at least a portion of the battery cell 11.

[0199] Here, the specific structural form of the first wall 22 is not limited. The relative positional relationship between the extension plate 2132 and the first wall 22 is not limited. For example, the extension plate 2132 may be located on the side of the first wall 22 facing the battery cell 11 or away from the battery cell 11 along the thickness direction (i.e., the third direction). Alternatively, the first wall 22 may be formed as a cavity structure, and at least a portion of the extension plate 2132 may be located within the cavity of the first wall 22.

[0200] The connection method between the extension plate 2132 and the first wall 22 is not limited. For example, they can be connected by means of bonding, welding, snap-fitting, fastener connection, etc. Alternatively, the extension plate 2132 and the first wall 22 can form an integral structure, or the extension plate 2132 and the first wall 22 can only abut against each other without being fixedly connected.

[0201] The extension plate 2132 is connected to the support plate 2131. The two can form an integral structure, or they can be connected by means of bonding, welding, snap-fitting, fastener connection, etc. In some examples, the extension plate 2132 and the support plate 2131 form an integral structure and extend in different directions.

[0202] The extension plate 2132 can extend specifically along a first direction, and the specific length range of the extension plate 2132 extending along the first direction is not limited. As an example, when projected onto the same projection plane along the thickness direction (i.e., the third direction) of the first wall 22, the projection of the extension plate 2132 overlaps with the projection of 3-5 battery cells 11. As another example, the extension plates 2132 at corresponding positions of the first supports 213 of the two side beams 21 are connected to each other.

[0203] In this embodiment, the extension plate 2132 can, on the one hand, jointly support the battery cell 11 with the first wall 22, thereby enhancing the support capacity of the housing assembly 2. On the other hand, the extension plate 2132 helps to balance the force on the support plate 2131, reduce the probability of the support plate 2131 tilting and deforming, and thus improve the deformation resistance of the side beam 21, meeting the expansion resistance requirements of the side beam 21.

[0204] In some embodiments, refer to Figure 7 The first support 213 also includes a reinforcing structure 2133 disposed on the side of the support plate 2131 away from the battery cell 11 along the first direction.

[0205] Here, the specific structural form of the reinforcing structure 2133 is not limited. As an example, the reinforcing structure 2133 includes one or more reinforcing ribs.

[0206] The reinforcement structure 2133 is connected to the support plate 2131. The two can form an integral structure, or they can be connected by means of bonding, welding, snap-fitting, fastener connection, etc.

[0207] In this embodiment, by providing a reinforcing structure 2133 on the side of the support plate 2131 away from the battery cell 11 along the first direction, the structural strength of the support plate 2131 can be further improved, thereby enhancing the deformation resistance of the side beam 21.

[0208] In some embodiments, the support structure 212 further includes a second support 214 located between the support plate 2131 and the fiber composite material layer 2b, the second support 214 including a foam layer; or, the support is configured as a fiber composite shell with an opening at at least one end facing the support plate 2131.

[0209] The second support 214 is used to provide support, and the second support 214 can be a block structure, column structure, plate structure or a combination of multiple structures.

[0210] The second support 214 is located between the support plate 2131 and the fiber composite material layer 2b. The second support 214 may be connected to the support plate 2131, or the second support 214 may be connected to the fiber composite material; or the second support 214 may be connected to both the support plate 2131 and the fiber composite material.

[0211] The second support 214 can be installed independently on the side beam 21, or it can cooperate with the first support 213. In some examples, the second support 214 and the first support 213 abut against each other.

[0212] The second support 214 includes a foam layer, which provides good support and is lightweight; the first support 213 is made of the same material as the fiber composite material layer 2b.

[0213] In some examples, the foam layer can be one or more of polyurethane foam, polystyrene foam, polypropylene foam, or metal foam. The support ribs of the first support 213 can be embedded in the foam layer.

[0214] In some examples, the second support 214 constitutes a fiber composite shell, which may be made of fiber-reinforced composite material. The fiber composite shell may include one or more chambers, each with an opening facing the support plate 2131, so that the second support 214 and the first support 213 cooperate to form a structure that closes the chambers.

[0215] In this embodiment, the multiple chambers of the fiber composite shell can adopt the same or different structures, and the multiple chambers can be distributed along a rectangular or circular array.

[0216] In this embodiment, the second support 214 enhances the structural strength of the side beam 21, and can also cooperate with other support structures 212 of the side beam 21 to further improve its structural strength. The second support 214 formed by the foam layer can mitigate impact, providing good support, and is lightweight, facilitating the lightweighting of the box structure. The second support 214 formed by the fiber composite shell has good structural strength and can also provide thermal insulation and corrosion resistance properties based on the matrix phase. The open cavity can reduce weight, facilitating the lightweighting of the box structure.

[0217] In the embodiment where the aforementioned side beam includes a layered fiber composite material layer 2b and an insulating structural layer 2a, refer to Figure 6 , Figure 9 and Figure 10 The fiber composite sheet 3 includes a bending portion 3c, which connects the main body portion 3a and the connecting portion 3b. The connecting portion 3b is connected to one side surface of the side beam 21 along the first direction, and an adhesive is provided between the connecting portion 3b and the side beam 21.

[0218] Here, the bent portion 3c specifically refers to the section located between the main body portion 3a and the connecting portion 3b where a bend occurs. As an example, the bent portion 3c has a curved surface, and the boundary of this curved surface is the boundary of the bent portion 3c. The specific angle of the bend between the main body portion 3a and the connecting portion 3b is not limited. As an example, the included angle between the surface of the main body portion 3a along the thickness direction and the surface of the connecting portion 3b along the thickness direction can be 80°-110°.

[0219] The bent portion 3c can be integrated with the main body 3a and the connecting portion 3b into a single structure. In actual manufacturing, the main body 3a, the bent portion 3c, and the connecting portion 3b can be formed by compression molding, that is, the fiber composite material is placed in a mold cavity at the molding temperature, and then the mold is closed and pressure is applied to shape and solidify it. Alternatively, a flat structure can be manufactured first, and then shaped into the first tension plate 31.

[0220] As mentioned above, the fiber composite pull plate 3 may include a first pull plate 31 and a second pull plate 32. In this embodiment, only the first pull plate 31 may have a bending portion 3c, only the second pull plate 32 may have a bending portion 3c, or both the first pull plate 31 and the second pull plate 32 may have a bending portion 3c.

[0221] An adhesive is provided between the connecting part 3b and the side beam 21. That is, the connecting part 3b and the side beam 21 are fixed by adhesive bonding. The specific composition, coating thickness and coating area of ​​the adhesive are not limited, as long as they can meet the fixing strength requirements.

[0222] In this embodiment, the connecting portion 3b of the fiber composite pull plate 3 is bent relative to the main body portion 3a to connect to one side surface of the side beam 21 along the first direction. This helps to increase the connection area between the connecting portion 3b and the side beam 21, allowing the expansion force borne by the side beam along the first direction to be better transmitted to the fiber composite pull plate 3, thereby further improving the modulus and strength of the housing along the first direction. Furthermore, the connecting portion 3b of the fiber composite pull plate 3 is fixed to the side beam 21 by adhesive bonding. This minimizes or at least reduces the number of holes drilled in the fiber composite layer and / or insulation layer 2a of the side beam 21, improving the sealing performance and structural strength of the side beam 21.

[0223] In some embodiments, the connecting portion 3b is connected to the side surface of the side beam 21 facing away from the battery cell 11 along a first direction.

[0224] Here, only the connecting part 3b of the first pull plate 31 can be connected to the side surface of the side beam 21 facing away from the battery cell 11 along the first direction, or only the connecting part 3b of the second pull plate 32 can be connected to the side surface of the side beam 21 facing away from the battery cell 11 along the first direction, or both the connecting parts 3b of the first pull plate 31 and the second pull plate 32 can be connected to the side surface of the side beam 21 facing away from the battery cell 11 along the first direction.

[0225] In this embodiment, the connecting part 3b is connected to the side surface of the side beam 21 that is away from the battery cell group 10 along the first direction, rather than the side surface that faces the battery cell group 10. This helps to preferentially transmit the expansion force to the side beam 21 (which has higher strength in comparison), and also helps to save internal space of the housing assembly 2 and improve energy density.

[0226] In some embodiments, refer to Figure 4 and Figure 6 The connecting part 3b has a first positioning structure 3d, and the side beam 21 has a second positioning structure 21b. The first positioning structure 3d and the second positioning structure 21b are connected in cooperation.

[0227] In this embodiment, the first positioning structure 3d and the second positioning structure 21b can position and pre-fix the connecting part 3b and the side beam 21 before the colloid between the connecting part 3b and the side beam 21 is completely cured, reducing the possibility of the connecting part 3b and the side beam 21 shifting to each other before the colloid is cured, thereby improving the positioning accuracy and connection strength of the connecting part 3b and the side beam 21 and reducing the assembly difficulty.

[0228] The specific structural forms of the first positioning structure 3d and the second positioning structure 21b are not limited, as long as they can be connected.

[0229] The specific positions of the first positioning structure 3d and the second positioning structure 21b are not limited. As an example, at least one second positioning structure 21b can be provided at each of the opposite ends in the length direction of the side beam 21, and the first positioning structure 3d can be provided at the corresponding position of the connecting part 3b.

[0230] In some embodiments, one of the first positioning structure 3d and the second positioning structure 21b is a hole structure, and the other is a protrusion structure, with the protrusion structure located within the hole structure. Alternatively, both the first positioning structure 3d and the second positioning structure 21b are hole structures, with an external connecting structure passing through the first positioning structure 3d and the second positioning structure 21b.

[0231] In an embodiment where one of the first positioning structure 3d and the second positioning structure 21b is a hole structure and the other is a protrusion structure, preferably, the second positioning structure 21b is a protrusion structure to reduce the number of holes drilled in the side beam 21.

[0232] In embodiments where both the first positioning structure 3d and the second positioning structure 21b are hole structures, the external positioning structure can be a screw, rivet, etc. It is understood that since the first positioning structure 3d and the second positioning structure 21b are used for positioning and pre-fixing, their number is relatively small, and setting them as hole structures will not have a significant adverse impact on the sealing performance of the housing. As an example, one or two second positioning structures 21b can be provided at each of the opposite ends of the side beam 21 along its length.

[0233] In this embodiment, the first positioning structure 3d and the second positioning structure 21b can improve the positioning accuracy and reduce the possibility of mutual displacement between the connecting part 3b and the side beam 21 after the first positioning structure 3d and the second positioning structure 21b are connected.

[0234] In some embodiments, the housing assembly 2 includes a first wall 22, on which the battery cell 11 is supported. The first wall 22 includes an insulating structure layer 2a and a fiber composite material layer 2b stacked together. Along the thickness direction of the first wall 22, the insulating structure layer 2a is located between the fiber composite material layer 2b and the battery cell 11.

[0235] Here, the insulating structure layer 2a and the fiber composite material layer 2b are stacked, specifically, both the insulating structure layer 2a and the fiber composite material layer 2b are plate-shaped structures. When projected along the thickness direction of the plate-shaped structure, the projections of the insulating structure layer 2a and the fiber composite material layer 2b overlap at least partially, so that the insulating structure layer 2a and the fiber composite material layer 2b are stacked together to form an integral laminate.

[0236] As mentioned above, the insulating structural layer 2a can be made of a single material, or it can be made of fiber composite material or other composite materials. The fiber composite layer 2b is made of fiber composite material.

[0237] The main difference between the insulating structural layer 2a and the fiber composite layer 2b is that the insulating structural layer 2a is insulating at least on the side surface facing the battery cell 11, while the fiber composite layer 2b may be non-insulating, or it may be partially or completely insulating.

[0238] In an example where both the insulating structure layer 2a and the fiber composite material layer 2b are made of fiber composite materials, the fibers in the insulating structure layer 2a and the fiber composite material layer 2b can be the same, such as at least one of glass fiber, basalt fiber, aramid fiber, ceramic fiber, carbon fiber, and polyethylene fiber. In this embodiment, if the fibers in the fiber composite material layer 2b of the insulating structure layer 2a include carbon fiber or other conductive fibers, an insulating coating can be applied to the surface of the insulating structure layer 2a facing the battery cell 11 to achieve insulation.

[0239] The fibers in the insulating structural layer 2a and the fiber composite material layer 2b can also be different. For example, the fibers of the fiber composite material in the insulating structural layer 2a may include at least one of glass fiber, basalt fiber, and aramid fiber. All of these fibers are insulating fibers. Therefore, in this embodiment, the insulating structural layer 2a may not require an insulating coating. The fibers of the fiber composite material in the fiber composite material layer 2b may include at least one of carbon fiber and polyethylene fiber.

[0240] As mentioned above, in some embodiments, the side beam 21 includes an insulating structural layer 2a and a fiber composite material layer 2b stacked together. In this embodiment, the insulating structural layer 2a of the side beam 21 can be connected to the insulating structural layer 2a of the first wall 22, and / or the fiber composite material layer 2b of the side beam 21 can be connected to the fiber composite material layer 2b of the first wall 22. The specific implementation of the connection is not limited, such as bonding, welding, snap-fitting, etc., or the two can form an integral structure.

[0241] The insulating structure layer 2a is located between the fiber composite material layer 2b and the battery cell 11. That is, the insulating structure layer 2a is located on the side of the first wall 22 facing the battery cell 11. Specifically, the insulating structure layer 2a can be provided as a whole on the side of the first wall 22 facing the battery cell 11, or the insulating structure layer 2a can be provided only on a part of the side of the first wall 22 facing the battery cell 11. It can be understood that the insulating layer provided as a whole has a better insulation effect.

[0242] As mentioned above, in some embodiments, the side beam 21 includes a first support 213, which includes an extension plate 2132. In this embodiment, the extension plate 2132 may be specifically disposed between the insulating structural layer 2a and the fiber composite material layer 2b of the first wall 22, and the extension plate 2132 may be connected to at least one of the insulating structural layer 2a and the fiber composite material layer 2b of the first wall 22. This improves the positional stability of the extension plate 2132 and enhances the connection and integrity between the first wall 22 and the side beam 21, thus contributing to improved structural strength of the housing assembly 2.

[0243] In this embodiment, the insulating structure layer 2a is used to support the battery cell 11 and also to electrically isolate the battery cell 11 from the outside world, reducing external interference to the battery cell 11. The combination of the insulating structure layer 2a and the fiber composite material layer 2b helps the housing assembly 2 to take into account both structural strength and protective performance.

[0244] In some embodiments, the fiber composite sheet 3 is connected to the housing of the battery cell 11.

[0245] Here, the housing of the battery cell 11 includes, but is not limited to, the housing at the shoulder of the battery cell 11 and the housing on the side along the second direction. As an example, the first pull plate 31 is connected to the housing at the shoulder of the battery cell 11, and the second pull plate 32 is connected to the housing on the side along the second direction of the battery cell 11.

[0246] As mentioned above, in some embodiments, the first pull plate 31 is connected to the busbar 4. In this embodiment, the first pull plate 31 may also be further connected to the housing of the battery cell 11 exposed to the busbar 4.

[0247] In this embodiment, the fiber composite pull plate 3 is connected to the shell of the battery cell 11, which helps to improve the constraint force of the fiber composite pull plate 3 on the battery cell 11.

[0248] In some embodiments, an adhesive layer is provided on the side of the main body 3a facing the battery cell 11.

[0249] That is, the main body 3a is connected to the casing of the battery cell 11 by adhesive bonding. Here, the specific composition, thickness and coating area of ​​the adhesive layer are not limited.

[0250] In this embodiment, it helps to improve the connection strength between the fiber composite sheet 3 and the casing of the battery cell 11 and reduce the connection difficulty.

[0251] In some embodiments, refer to Figure 10 and Figure 11As mentioned above, the fiber composite sheet 3 also includes a bending portion 3c, which connects the main body portion 3a and the connecting portion 3b. The thickness of the bending portion 3c is greater than the thickness of at least a portion of the main body portion 3a.

[0252] Here, the thickness of the bent portion 3c can be made greater than the thickness of at least part of the main body portion 3a by thickening the bent portion 3c during the manufacturing process. The material used for thickening the bent portion 3c can be a composite material or not.

[0253] As an example, during the manufacturing process, more composite material or other molding material can be provided at the position corresponding to the bending portion 3c in the molding die, thereby making the thickness of the bending portion 3c greater than the thickness of at least part of the main body portion 3a. As another example, a structure of uniform thickness can be prepared first, and then the thickening material can be attached to the position corresponding to the bending portion 3c.

[0254] It is understandable that the bending part 3c is subjected to more complex forces than the main body 3a. Therefore, in this embodiment, the bending part 3c is thickened, which can increase the modulus and strength of the bending part 3c, thereby improving the overall structural strength.

[0255] In some embodiments, the fiber composite sheet 3 includes a first substrate and a first fiber, wherein the first fiber is a continuous fiber and extends along a first direction in the main body portion 3a.

[0256] Here, the first fiber is formed as the reinforcing phase of the fiber composite material, and the first substrate is formed as the matrix phase of the fiber composite material. The specific selection of materials for both can be referred to the description in the relevant section above.

[0257] It is understood that in this embodiment, the first fiber is actually formed as a unidirectional fiber band structure.

[0258] In this embodiment, the first fiber in the fiber composite sheet 3 is configured to extend along the first direction, which can improve the modulus and strength of the fiber composite sheet 3 along the first direction, thereby improving the modulus and strength of the box assembly 2 along the first direction.

[0259] In some embodiments, the first fiber extends from one connecting portion 3b to another connecting portion 3b.

[0260] Here, the extension of the first fiber from one connecting portion 3b to another connecting portion 3b specifically means that the first fiber extends from one connecting portion 3b, through the main body portion 3a (and in some embodiments, through the bending portion 3c) to another connecting portion 3b.

[0261] In this embodiment, the main body 3a and the connecting part 3b are actually formed as an integral structure, which helps to further improve the structural strength of the fiber composite sheet 3.

[0262] In some embodiments, the first substrate includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin; and / or the first fiber includes at least one of glass fiber, basalt fiber, and aramid fiber.

[0263] In some examples, the first substrate is one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin; in other examples, the first substrate is composed of two or more of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin.

[0264] In some examples, the first fiber is either carbon fiber or polyethylene fiber; in other examples, the first fiber is a composite of carbon fiber and polyethylene fiber.

[0265] In some examples, the first substrate includes polyurethane, and the first fiber includes one or more of carbon fiber and polyethylene fiber. The first fiber fabric composed of polyurethane and the first fiber has advantages such as high elasticity, abrasion resistance and high tear strength.

[0266] In some examples, the first substrate includes epoxy resin, and the first fiber includes one or more of carbon fiber and polyethylene fiber. The first fiber fabric composed of epoxy resin and the first fiber has advantages such as good adhesion, high mechanical strength, and strong corrosion resistance.

[0267] In some examples, the first substrate includes phenolic resin, and the first fiber includes one or more of carbon fiber and polyethylene fiber. The first fiber fabric composed of phenolic resin and the first fiber has advantages such as good heat resistance and good flame retardancy.

[0268] In some examples, the first substrate includes polyamide resin, and the first fiber includes one or more of carbon fiber and polyethylene fiber. The first fiber fabric composed of polyamide resin and the first fiber has advantages such as high strength, good abrasion resistance, and good oil resistance.

[0269] In some examples, the first substrate includes a ceramizable resin, and the first fiber includes one or more of carbon fiber and polyethylene fiber. The first fiber fabric composed of the ceramizable resin and the first fiber has advantages such as good structural stability, high temperature resistance, and good flame retardancy.

[0270] In some examples, the first fiber includes carbon fiber, and the first substrate includes polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin. The first fiber fabric composed of carbon fiber and the first substrate has advantages such as high strength, low density, corrosion resistance, and good thermal stability.

[0271] In some examples, the first fiber includes polyethylene fiber, and the first substrate includes polyurethane, epoxy resin, phenolic resin, polyamide resin, ceramizable resin, etc. The first fiber fabric composed of polyethylene fiber and the first substrate has advantages such as high strength and toughness, low density, and easy processing.

[0272] The technical solution of this application embodiment has the characteristics of lightweight and high strength in the fiber composite material formed by the first substrate and the first fiber, which is beneficial to reduce the weight of the fiber composite plate 3 and improve the structural strength of the fiber composite plate 3.

[0273] In some embodiments, the fiber composite sheet 3 includes a second fiber, which is a woven fiber, and the second fiber and the first fiber are stacked together along the thickness direction of the fiber composite sheet 3.

[0274] Here, the second fiber and the first fiber can be the same type of fiber, the only difference being that the first fiber is a continuous fiber and the second fiber is a woven fiber. The second fiber and the first fiber may also be different types of fibers.

[0275] The second fiber can be located on the side of the first fiber facing the battery cell 11 along the thickness direction of the fiber composite sheet 3, or it can be located on the side away from the battery cell 11, or at least a portion of the second fiber can be located between the two layers of the first fiber.

[0276] The first fiber and the second fiber can be stacked only in a part of the fiber composite sheet 3 (e.g., the part corresponding to the bending part 3c), while only the first fiber is provided in another part of the part (e.g., the part corresponding to the main body part 3a and the connecting part 3b), thus achieving local thickening of the fiber composite sheet 3.

[0277] It is understandable that both the first fiber and the second fiber are bonded together with the help of the first substrate.

[0278] It is understood that in this embodiment, the thickness of the region where the first fiber and the second fiber are stacked will be greater than the thickness of the region where only the first fiber is present.

[0279] As an example, the number of layers of the first fiber is 2-6, such as 2, 3, 4, 5, or 6 layers.

[0280] The total thickness of the first fiber is 1-3mm, such as 1mm, 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, 2.6mm, 2.7mm, 2.8mm, 2.9mm, and 3mm.

[0281] The second fiber has 1-8 layers, such as 1, 2, 3, 4, 5, 6, 7, 8, etc.

[0282] The total thickness of the second fiber is 1-4mm, such as 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.8mm, 4mm, etc.

[0283] In the region where the first and second fibers are stacked, the thickness ratio of the second fiber to the first fiber is 0.5-4. Examples include 0.5, 0.8, 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, 3.2, 3.5, 3.8, and 4. The total thickness of the second and first fibers is 2.5mm-5mm. Examples include 2.5mm, 2.8mm, 3.0mm, 3.2mm, 3.5mm, 3.8mm, 4mm, 4.2mm, 4.5mm, 4.8mm, and 5mm.

[0284] In this embodiment, the fiber composite sheet 3 includes both a first fiber and a second fiber. The first fiber is a continuous fiber extending in one direction, and the second fiber is a woven fiber, thereby improving the structural strength of the fiber composite sheet 3.

[0285] In some embodiments, as mentioned above, the fiber composite sheet 3 includes a bent portion 3c, which connects the main body portion 3a and the connecting portion 3b. In this embodiment, a second fiber is provided at least at a position corresponding to the bent portion 3c.

[0286] In this embodiment, the second fiber may cover only a portion of the bent portion 3c, or it may cover the entire bent portion 3c. The second fiber may not extend to the main body portion 3a and the connecting portion 3b, or the second fiber may extend to the main body portion 3a and the connecting portion 3b.

[0287] As mentioned above, the stress on the bending portion 3c is relatively complex. Therefore, in this embodiment, a second fiber is provided at the position corresponding to the bending portion 3c. Since the second fiber is a braided fiber, it can improve the modulus and strength of the bending portion 3c in multiple directions, thereby improving the structural strength of the fiber composite sheet 3.

[0288] In some embodiments, the second fiber includes at least one selected from glass fiber, basalt fiber, and aramid fiber. This improves both the structural strength and insulation performance of the fiber composite sheet 3.

[0289] In some embodiments, a plurality of battery cell groups 10 are arranged along a second direction to form a battery cell array 1, the second direction intersecting with the first direction; refer to Figure 11The fiber composite pull plate 3 includes at least one third pull plate 33, which is disposed between two adjacent battery cell groups 10 and covers at least a portion of the battery cell group 10 along the second direction.

[0290] As an example, the connecting part 3b of the third pull plate 33 is connected to the side surface of the side beam 21 facing the battery cell pack 10 in the first direction.

[0291] In this embodiment, the third pull plate 33 can further enhance the modulus and strength of the housing assembly 2 along the first direction, and can also constrain the battery cell group 10 along the second direction and resist the expansion force of the battery cell 11 along the second direction.

[0292] In some embodiments, the housing assembly 2 includes a first wall 22, a battery cell 11 supported on the first wall 22, and a third pull plate 33 connected to the first wall 22.

[0293] Here, the specific connection method between the third pull plate 33 and the first wall 22 is not limited. It can be adhesive, welding, snap-fit, fastener connection, or the two can form an integral structure.

[0294] In this embodiment, the third pull plate 33 is connected to the first wall 22, which helps to improve the integrity of the box assembly 2 and thus improve the structural strength of the box assembly 2.

[0295] In some embodiments, the maximum distance between the third pull plate 33 and the first wall 22 is greater than or equal to the maximum distance between the shoulder of the battery cell 11 and the first wall 22.

[0296] In this embodiment, it helps to provide constraints and support for the battery cell 11 along its entire length in the height direction, thereby improving the structural strength of the housing assembly 2.

[0297] In some embodiments, the side beam 21, the first wall 22, and the third tie plate 33 are formed as an integral structure.

[0298] As an example, the side beam 21, the first wall 22 and the third tie plate 33 all include an insulating structural layer 2a, and at least a portion of the insulating structural layer 2a of the three are formed into an integral structure, thereby making the three into an integral structure.

[0299] In this embodiment, by forming the side beam 21, the first wall 22 and the third tie plate 33 into an integral structure, the connection strength between the side beam 21 and the first wall 22, as well as the connection strength between the third tie plate 33 and the first wall 22, and between the third tie plate 33 and the side beam 21, can be improved, thereby increasing the structural strength of the box assembly 2.

[0300] Embodiments of this application also provide an electrical device that includes the battery device 100 described in any of the above embodiments. The electrical device of this application has all the advantages of the battery device 100 described in any of the above embodiments, which will not be repeated here.

[0301] In some embodiments, the electrical equipment includes aircraft, which generally refers to machinery that flies within or outside the atmosphere (space), and may include aircraft flying within the atmosphere and spacecraft flying in space. Aircraft may include airplanes, airships, etc., and for example, may be low-altitude aircraft, eVTOL (electric vertical take-off and landing) aircraft, commuter aircraft, regional aircraft, etc. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0302] The battery device 100 and the electrical equipment in one or more of the above embodiments will be described in more detail and specific way with reference to a specific embodiment.

[0303] Reference Figures 1-12 The electrical equipment in this application embodiment includes an aircraft. By installing a battery device 100 on the aircraft, the battery device 100 can provide electrical power to the aircraft, enabling it to fly.

[0304] In this context, "aircraft" generally refers to any device that flies within or outside the atmosphere (space), including both atmospheric aircraft and spacecraft. Aircraft can include airplanes, airships, etc., and for example, low-altitude aircraft, eVTOL (electric vertical take-off and landing) aircraft, commuter aircraft, regional jets, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft. For example, an aircraft could be a cargo drone.

[0305] The battery device 100 is installed on the aircraft and is used to provide electrical power to the aircraft. The battery device 100 includes a housing assembly 2 and a battery cell array 1. The housing assembly 2 forms a receiving cavity, and a cover can be connected to the housing assembly 2 to seal the receiving cavity. The battery cell array 1 is disposed in the receiving cavity.

[0306] The battery cell array 1 includes at least two battery cell groups 10, each battery cell group 10 including multiple battery cells 11. The at least two battery cell groups 10 are arranged sequentially along a second direction. Multiple battery cells 11 in the same battery cell group 10 are arranged along a first direction. The battery cells 11 are approximately cuboid in shape, and the surface of the battery cell 11 with the largest area is perpendicular to the first direction. The height direction of the battery cells 11 is set along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other.

[0307] The housing assembly 2 is approximately a cuboid structure, including a first wall 22, two side plates 23 and two side beams 21. The first wall 22 is used to support the battery cell array 1. The two side beams 21 are arranged on opposite sides of the first wall 22 along a first direction. The two side plates 23 are arranged on opposite sides of the first wall 22 along a second direction. The side plates 23 and the side beams 21 are both connected to the first wall 22. Adjacent side plates 23 are connected to the side beams 21.

[0308] The first wall 22 includes an insulating structural layer 2a and a fiber composite material layer 2b stacked along a third direction, with the insulating structural layer 2a located on the side of the first wall 22 facing the battery cell 11; the side beam 21 includes an insulating structural layer 2a and a fiber composite material layer 2b stacked at least along a first direction, with the insulating structural layer 2a located on the side of the side beam 21 facing the battery cell 11, and in the beam member, the insulating structural layer 2a and the fiber composite material layer 2b form a butt joint or lap joint connection structure on the side of the side beam 21 away from the receiving cavity; the side plate 23 includes an insulating structural layer 2a and a fiber composite material layer 2b stacked at least along a second direction, with the insulating structural layer 2a located on the side of the side plate 23 facing the battery cell 11, and in the side plate 23, the insulating structural layer 2a and the fiber composite material layer 2b form an lap joint connection structure on the side of the side plate 23 member away from the first wall 22.

[0309] In some specific embodiments, the insulating structural layer 2a of the first wall 22, the insulating structural layer 2a of the side beam 21, and the insulating structural layer 2a of the side plate 23 are formed as an integral structure, and the fiber composite material layer 2b of the first wall 22, the fiber composite material layer 2b of the side beam 21, and the fiber composite material layer 2b of the side plate 23 are formed as an integral structure.

[0310] In some specific embodiments, a hollow cavity 211 is formed between the fiber composite material layer 2b and the insulation layer of the side beam 21, and the support structure 212 is disposed within the hollow cavity 211.

[0311] The support structure 212 includes a first support body 213, the first support body 213 having a support plate 2131 facing the first plate, the first direction being the thickness direction of the support plate 2131, and the support plate 2131 abutting against the first plate along the first direction.

[0312] The first support 213 also includes an extension plate 2132 connected to the support plate 2131. The extension plate 2132 is connected to the side of the support plate 2131 facing the battery cell 11 and extends along the first direction. The extension plate 2132 is connected to the first wall 22 and projects onto the same projection plane along the thickness direction of the first wall 22. The projection of the extension plate 2132 overlaps with the projection of at least a portion of the battery cell 11.

[0313] In some specific embodiments, the extension plate 2132 is located between the insulating structural layer 2a and the fiber composite material layer 2b of the first wall 22.

[0314] The battery device 100 also includes a fiber composite sheet 3, which includes a main body 3a, a bent portion 3c, and a connecting portion 3b. The connecting portion 3b is located at both ends of the main body 3a along a first direction. The connecting portion 3b is connected to the side surface of the side beam 21 that is opposite to the battery cell 11 along the first direction. An adhesive layer is provided between the connecting portion 3b and the side beam 21. The connecting portion 3b has a first positioning structure 3d, and the side beam 21 has a second positioning structure 21b. The first positioning structure 3d and the second positioning structure 21b are connected in a cooperating manner. Both the first positioning structure 3d and the second positioning structure 21b are hole structures.

[0315] The fiber composite sheet 3 includes a first substrate and a first fiber. The first fiber is a continuous fiber. In the main body 3a, the first fiber extends along a first direction. The first substrate includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin; and / or the first fiber includes at least one of glass fiber, basalt fiber, and aramid fiber.

[0316] The fiber composite sheet 3 also includes a second fiber, which is a woven fiber. The second fiber and the first fiber are stacked together along the thickness direction of the fiber composite sheet 3, and the second fiber is disposed at least at the position corresponding to the bending portion 3c. The second fiber includes at least one of glass fiber, basalt fiber, and aramid fiber.

[0317] The fiber composite pull plate 3 includes at least one first pull plate 31, which covers at least a portion of the terminal posts 112 of the battery cell assembly 10 from the side of the battery cell assembly 10 away from the first wall 22.

[0318] The fiber composite pull plate 3 includes at least two second pull plates 32, which cover both sides of the battery cell array 1 along the second direction. The second pull plates 32 are located on the side of the side plate 23 away from the first wall 22 along the thickness direction (i.e., the third direction).

[0319] The battery device 100 also includes a busbar 4, which is located between the battery cell group 10 and the first pull plate 31. The first pull plate 31 has an insulating layer on the side facing the battery cell 11 and is bonded to the busbar 4.

[0320] The battery device 100 also includes a sampling component 5, which is located between the first pull plate 31 and the battery cell group 10. The sampling component 5 has at least one output element 51. The first pull plate 31 has a clearance notch 31a, which is positioned corresponding to the output element 51. The side beam 21 has at least one clearance groove 21a, and the output element 51 is at least partially located within the clearance groove 21a.

[0321] In the description of this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this application, 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, without contradiction, those skilled in the art can combine different embodiments or examples described in this application, as well as features of different embodiments or examples.

[0322] 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 should be included within the scope of protection of this application.

Claims

1. A battery device, characterized in that, The battery device includes: A battery cell group includes multiple battery cells stacked along a first direction; A housing assembly for defining a receiving cavity in which the battery cell assembly is disposed; A fiber composite sheet, the fiber composite sheet comprising a main body and a connecting part, the connecting part being located at both ends of the main body along a first direction; The housing assembly includes two side beams arranged opposite each other along a first direction. The two side beams are used to constrain the battery cell group, and the connecting part is connected to the side beams.

2. The battery device according to claim 1, characterized in that, The housing assembly includes a first wall, the battery cell is supported on the first wall, and the side beams are connected to opposite ends of the first wall along the first direction; The fiber composite sheet includes at least one first sheet that covers at least a portion of the terminal posts of the battery cell assembly from the side of the battery cell assembly away from the first wall.

3. The battery device according to claim 2, characterized in that, An insulating layer is formed on the side of the first pull plate facing the battery cell.

4. The battery device according to claim 3, characterized in that, The battery device further includes a busbar, which is located between the battery cell group and the first pull plate, and the first pull plate is bonded to the busbar.

5. The battery device according to any one of claims 2-4, characterized in that, The battery device further includes a sampling component located between the first pull plate and the battery cell group. The sampling component has at least one output component. The first pull plate has an avoidance notch, which is positioned corresponding to the output component.

6. The battery device according to claim 5, characterized in that, The side beam has at least one clearance groove, and the output component is at least partially located within the clearance groove.

7. The battery device according to any one of claims 2-6, characterized in that, The first pull plate is connected to the side of the side beam away from the battery cell along the first direction. The battery device includes a mounting bracket for mounting electrical components. The mounting bracket is connected to the first pull plate away from the side beam along the first direction.

8. The battery device according to any one of claims 1-7, characterized in that, Multiple battery cell groups are arranged along a second direction to form a battery cell array, the second direction intersecting the first direction; The fiber composite sheet includes at least one second sheet that covers at least a portion of the battery cell array along the second direction.

9. The battery device according to claim 8, characterized in that, The housing assembly includes a first wall, on which the battery cells are supported. The plurality of side walls include two side plates, which are disposed at opposite ends of the first wall along the second direction. The side plates are used to constrain the battery cell assembly. A second pull plate is located on the side of the side plate opposite to the first wall along the thickness direction of the first wall.

10. The battery device according to any one of claims 1-9, characterized in that, The side beam includes a laminated insulating structure layer and a fiber composite material layer, with at least a portion of the insulating structure layer located between the fiber composite material layer and the battery cell.

11. The battery device according to claim 10, characterized in that, The side beam is configured as a hollow structure with a hollow cavity, which is located between the insulating structure layer and the fiber composite material layer of the side wall.

12. The battery device according to claim 11, characterized in that, The side beam also includes a support structure located in the hollow cavity and abutting against at least one of the insulating structural layer and the fiber composite material layer of the side wall.

13. The battery device according to claim 12, characterized in that, The support structure includes a first support body, the first support body including a support plate having a support surface facing the insulating structural layer, the first direction being the thickness direction of the support plate, and along the first direction, the support surface of the support plate abuts against the insulating structural layer.

14. The battery device according to claim 13, characterized in that, The housing assembly includes a first wall, on which the battery cell is supported. The first support also includes an extension plate connected to the support plate. The extension plate is connected to the side of the support plate facing the battery cell and extends along the first direction. The extension plate is connected to the first wall and projects onto the same projection plane along the thickness direction of the first wall. The projection of the extension plate overlaps with the projection of at least a portion of the battery cell.

15. The battery device according to claim 13 or 14, characterized in that, The first support includes a reinforcing structure disposed on the side of the support plate opposite to the battery cell.

16. The battery device according to any one of claims 13-15, characterized in that, The support structure further includes a second support body, which is located between the support plate and the fiber composite material layer. The second support includes a foam layer; or, The second support is configured as a fiber composite shell with an opening at at least one end, the opening facing the support plate.

17. The battery device according to any one of claims 10-16, characterized in that, The fiber composite sheet includes a bending portion, which connects the main body and the connecting portion. The connecting portion is connected to one side surface of the side beam along the first direction, and an adhesive is provided between the connecting portion and the side beam.

18. The battery device according to claim 17, characterized in that, The connecting part is connected to the side surface of the side beam that is away from the battery cell along the first direction.

19. The battery device according to claim 17 or 18, characterized in that, The connecting part has a first positioning structure, and the side beam has a second positioning structure. The first positioning structure and the second positioning structure are connected in cooperation.

20. The battery device according to claim 19, characterized in that, One of the first positioning structure and the second positioning structure is a hole structure, and the other is a protrusion structure, wherein the protrusion structure is located within the hole structure; or Both the first positioning structure and the second positioning structure are hole structures, and the external connecting structure passes through the first positioning structure and the second positioning structure.

21. The battery device according to any one of claims 1-20, characterized in that, The housing assembly includes a first wall, on which the battery cell is supported. The first wall includes a laminated insulating structure layer and a fiber composite material layer. Along the thickness direction of the first wall, the insulating structure layer is located between the fiber composite material layer and the battery cell.

22. The battery device according to any one of claims 1-21, characterized in that, The fiber composite sheet is connected to the casing of the battery cell.

23. The battery device according to claim 22, characterized in that, An adhesive layer is provided on the side of the main body facing the battery cell.

24. The battery device according to any one of claims 1-23, characterized in that, The fiber composite sheet also includes a bending portion, which connects the main body and the connecting portion, and the thickness of the bending portion is greater than at least a portion of the thickness of the main body.

25. The battery device according to any one of claims 1-24, characterized in that, The fiber composite sheet includes a first substrate and a first fiber, wherein the first fiber is a continuous fiber and extends along the first direction in the main body.

26. The battery device according to claim 25, characterized in that, The first fiber extends from one of the connecting portions to the other connecting portion.

27. The battery device according to claim 25 or 26, characterized in that, 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 glass fiber, basalt fiber, and aramid fiber.

28. The battery device according to any one of claims 25-27, characterized in that, The fiber composite sheet includes a second fiber, which is a woven fiber, and the second fiber and the first fiber are stacked together along the thickness direction of the composite sheet.

29. The battery device according to claim 28, characterized in that, The fiber composite sheet includes a bending portion that connects the main body and the connecting portion, and the second fiber is disposed at least at a position corresponding to the bending portion.

30. The battery device according to claim 28 or 29, characterized in that, The second fiber includes at least one of glass fiber, basalt fiber, and aramid fiber.

31. The battery device according to claim 1, characterized in that, Multiple battery cell groups are arranged along a second direction to form a battery cell array, the second direction intersecting the first direction; The fiber composite sheet includes at least one third sheet, which is disposed between two adjacent battery cell groups and covers at least a portion of the battery cell groups along the second direction.

32. The battery device according to claim 31, characterized in that, The housing assembly includes a first wall, the battery cell is supported on the first wall, and the third pull plate is connected to the first wall.

33. The battery device according to claim 32, characterized in that, The maximum distance between the third pull plate and the first wall is greater than or equal to the maximum distance between the shoulder of the battery cell and the first wall.

34. The battery device according to claim 32, characterized in that, The side beam, the first wall, and the third tie plate form an integral structure.

35. An electrical appliance, characterized in that, The electrical equipment includes the battery device according to any one of claims 1-34.

36. The electrical equipment according to claim 35, characterized in that, The electrical equipment includes aircraft.

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