Battery device, power utilization device and energy storage device

Abstract

The invention discloses a battery device, a power utilization device and an energy storage device.The battery device comprises a box body, the box body comprises a box body and a box cover, the box body and the box cover are connected and matched to define a containing cavity, the box cover is provided with a convex rib protruding towards the interior of the containing cavity, the convex rib extends in the first direction, a part of the box cover forms a deformation part, and the deformation part is arranged in the containing cavity; the deformation part is configured to deform along a first direction; the plurality of battery monomer assemblies are arranged in the accommodating cavity and are arranged along a second direction, each battery monomer assembly comprises a plurality of battery monomers which are stacked along the first direction, and the convex ribs are fixedly connected with the battery monomer assemblies. According to the technical scheme, the convex ribs can play a role of a pressing strip in the battery monomer assembly, so that a pressing strip structure does not need to be arranged in the battery monomer assembly, the number of parts is reduced, the occupied space is reduced, and the energy density of the battery device is improved; the convex ribs can enhance the structural strength of the box cover and reduce the probability that the box cover swells and generates abnormal sound.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular, to a battery device, an electric device, and an energy storage device. Background Art

[0002] In recent years, new energy vehicles have achieved leapfrog development. In the field of electric vehicles, the battery device, as the power source of the electric vehicle, plays an irreplaceable and important role. Among them, as a core component of new energy vehicles, the battery device has high requirements both in terms of energy density and reliability.

[0003] In related technologies, a plurality of battery modules are usually arranged in the box body of the battery device. The battery module has a large number of components, complex assembly, and occupies a large amount of layout space in the box body, affecting the energy density and overall performance of the battery device. At the same time, the box body includes a box main body and an upper cover covering the box main body. Since the box cover plays a role in protecting the components in the box body, the structural strength and performance of the box cover need to be further improved. Summary of the Invention

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. For this reason, the present application provides a battery device, an electric device, and an energy storage device including this battery device. The battery device can enhance the structural strength of the box cover, reduce the probability of the box cover bulging and making abnormal noises, and there is no need to provide a pressing strip structure in the battery cell assembly, reducing the number of components, reducing space occupation, and improving the energy density of the battery device.

[0005] In a first aspect, an embodiment of the present application provides a battery device, including: a box body, the box body includes a box main body and a box cover, the box main body and the box cover are connected and cooperate to define a receiving cavity, the box cover is provided with a rib protruding towards the receiving cavity, the rib extends along a first direction, a part of the box cover forms a deformation part, the deformation part is configured to be deformable along the first direction; a plurality of battery cell assemblies, the plurality of battery cell assemblies are arranged in the receiving cavity and arranged along a second direction, the second direction intersects with the first direction, each battery cell assembly includes a plurality of battery cells stacked along the first direction, and the rib is fixedly connected to the battery cell assembly.

[0006] In the above technical solution, since the cover is provided with ribs extending in the first direction, and the ribs are fixedly connected to the battery cell assembly, the ribs can act as the pressure strips in the battery cell assembly, and are used to offset the expansion force generated by the battery cell when the battery cell expands, and limit the expansion amount of the battery cell assembly in the first direction. Thus, it is possible to dispense with the pressure strip structure in the battery cell assembly, reduce the number of components, reduce the space occupied, and improve the energy density of the battery device; and the ribs can enhance the structural strength of the cover, reduce the probability of the cover bulging and making abnormal noises, and can also reduce the thickness of the cover under the same strength, further improving the energy density of the battery device. Since the cover is formed with a deformable portion that can deform in the first direction, when the battery cell expands, the deformable portion can absorb the expansion force of the battery cell through deformation, thereby reducing the risk of the cover being torn and failing when the battery cell expands.

[0007] In some embodiments, in the first direction, the two ends of the rib are respectively flush with the two ends of the battery cell assembly or respectively extend beyond the two ends of the battery cell assembly.

[0008] In the above technical solution, by making the two ends of the rib respectively flush with or extend beyond the two ends of the battery cell assembly, the rib can completely cover the multiple battery cells of the battery cell assembly in the first direction. Thus, the rib can offset the expansion force generated by any one battery cell and limit the expansion amount of any one battery cell, thereby reducing the displacement of the battery cell and reducing the probability of local stress concentration.

[0009] In some embodiments, the rib is fixedly connected to each of the multiple battery cells in the battery cell assembly.

[0010] In the above technical solution, by fixedly connecting the rib to each battery cell in the battery cell assembly, not only can the connection reliability between the rib and the battery cell assembly be further improved, but also the forces on the multiple battery cells can be made more uniform, reducing the probability of relative displacement of the battery cells caused by vibration or impact of the battery device, reducing the risk of breakage of the battery cell terminals, and improving the structural strength and reliability of the battery device.

[0011] In some embodiments, the rib and the battery cell assembly are adhesively connected by structural adhesive.

[0012] In the above technical solution, the rib is adhesively connected to the battery cell assembly through structural adhesive. This can not only simplify the connection structure between the rib and the battery cell assembly, improve the assembly efficiency, but also enhance the connection strength between the battery cell assembly and the rib, ensure the anti-expansion effect of the battery cell assembly by the rib on the cover, further reduce the probability of the cover bulging and making abnormal noises, and also improve the structural strength and sealing performance between the cover and the battery cell assembly. In addition, since the rib on the cover is directly adhesively connected to the battery cell assembly through structural adhesive, in this way, the insulating film and / or buffer structural member (foam) between the cover and the battery cell assembly can be cancelled. Thus, the components in the battery device can be further reduced, the space utilization rate in the battery device can be improved, the cost can be reduced, and the assembly efficiency can be enhanced.

[0013] In some embodiments, the number of the ribs is multiple, and the multiple ribs are arranged along the second direction.

[0014] In the above technical solution, by providing multiple ribs, not only can the anti-expansion effect on the battery cell assembly be further enhanced, but also the structural strength of the cover can be further increased, the probability of the cover bulging and making abnormal noises can be reduced, and the reliability of the battery device can be further improved.

[0015] In some embodiments, a part of the multiple ribs is formed as a first rib, and the cell shoulder on at least one side of the battery cell housing in the second direction is fixedly connected to the first rib.

[0016] In the above technical solution, by directly fixedly connecting the cell shoulder on at least one side of the battery cell housing in the second direction to the first rib, the connection and fixing effect between the first rib and the battery cell can be improved, the anti-expansion effect on the battery cell can be enhanced, the deformation amount and displacement amount of the battery cell can be reduced, and the probability of interference between the first rib and the pole column and conductive sheet of the battery cell can also be reduced, the structure can be made more compact, and the space utilization rate in the battery device can be improved.

[0017] In some embodiments, the first rib is disposed between two adjacent battery cell assemblies and is fixedly connected to both of the two adjacent battery cell assemblies.

[0018] In the above technical solution, by disposing one first rib between two battery cell assemblies and simultaneously connecting the two adjacent battery cell assemblies arranged adjacent to each other, the number of the first ribs on the cover can be reduced, the cover structure can be simplified, and the processing difficulty of the cover can be reduced.

[0019] In some embodiments, the battery cell assembly further includes: a conductive sheet connected to the pole column of the battery cell, and a part of the multiple ribs is formed as a second rib, and the second rib is fixedly connected to the conductive sheet.

[0020] In the above technical solution, by fixedly connecting the conductive sheet of the battery cell assembly to the second rib on the box cover, the connection area between the box cover and the battery cell assembly can be increased, the anti-expansion effect of the box cover on the battery cell assembly can be enhanced, the deformation and displacement of the battery cell can be reduced, and the structural strength of the box cover can be further improved, reducing the probability of deformation of the box cover and abnormal noise.

[0021] In some embodiments, the convex rib is formed by a portion of the box cover being recessed toward the accommodating cavity.

[0022] In the above technical solution, by forming the convex rib from a part of the box cover toward the accommodating cavity, the material usage of the box cover can be reduced. While maintaining the structural strength of the box cover, the lightweight design of the box cover can be achieved, the production cost of the box cover can be reduced, and the energy density of the battery device can be improved.

[0023] In some embodiments, the convex rib defines a groove on a side away from the accommodating cavity, and the box body further includes: a reinforcement member extending along a first direction and fixed in the groove.

[0024] In the above technical solution, by arranging a reinforcement in the groove defined by the convex rib, the reinforcement can significantly improve the structural strength of the convex rib, improve the structural strength of the box cover, improve the anti-expansion effect of the box cover on the battery cell assembly, and also improve the box cover's ability to resist external impacts, reduce the probability of bending, deformation, breakage and abnormal noise of the box cover, and improve the service life of the battery device.

[0025] In some embodiments, the reinforcement member is a steel member or a long fiber reinforced composite member.

[0026] In the above technical solution, the reinforcement is made of steel, which can significantly improve the strength and hardness of the reinforcement, enhance the deformation resistance of the box cover, and keep the box cover structure stable. The reinforcement is made of fiber-reinforced composite material, which can enhance the structural strength of the reinforcement and reduce the weight of the reinforcement, thereby achieving lightweight box cover and improving the energy density of the battery device.

[0027] In some embodiments, the deformation portion is formed as a concave rib extending along the second direction and recessed toward the accommodating cavity, and in a third direction, there is a gap between the concave rib and the battery cell assembly, and the third direction intersects both the first direction and the second direction.

[0028] In the above technical solution, since the deformation portion is formed as a concave rib recessed toward the accommodating cavity and has a gap between the deformation portion and the battery cell assembly, the structure of the deformation portion can be simplified, the processing and forming of the deformation portion can be facilitated, and the probability of interference between the deformation portion and the battery cell assembly can be reduced, thereby improving the stability of the battery device.

[0029] In some embodiments, the number of the deformation portions is plural, and the plural deformation portions are arranged at intervals along the first direction.

[0030] In the above technical solution, by providing a plurality of deformation portions, the deformable amount of the battery cover in the first direction can be increased, the absorption effect of the expansion force of the battery cell can be improved, and the risk of the battery cover being torn and failing can be further reduced.

[0031] In some embodiments, the battery cover is a fiber-reinforced composite material part, and the fibers in the battery cover extend along the first direction; or, the battery cover is a plastic part or a metal part.

[0032] In the above technical solution, since the battery cover is a fiber-reinforced composite material part, a plastic part or a metal part, the structural strength of the battery cover can be improved, the cost of the battery cover can be reduced, and a suitable material for the battery cover can be selected according to design requirements to improve the applicability of the battery cover.

[0033] In some embodiments, the periphery of the battery cover is adhesively connected to the battery main body through an adhesive layer, and the adhesive layer is a structural adhesive layer and extends circumferentially along the battery cover to form a ring.

[0034] In the above technical solution, the periphery of the battery cover is adhesively connected to the battery main body through a structural adhesive layer, which can not only improve the connection strength between the battery cover and the battery main body, but also improve the sealing performance of the connection position between the battery main body and the battery cover, thereby improving the overall sealing performance of the battery box. In addition, the number of components of the battery device can be reduced, and the assembly efficiency can be improved.

[0035] In some embodiments, the battery box further includes: two expansion beams, the two expansion beams extend along the second direction and are arranged at intervals in the first direction, and the plurality of battery cell assemblies are all arranged between the two expansion beams.

[0036] In the above technical solution, by arranging the plurality of battery cell assemblies between the two expansion beams, the expansion amount of the battery cell assemblies in the first direction can be restricted by the expansion beams, the deformation and displacement of the battery cells can be reduced, and the stability of the battery device can be improved.

[0037] In a second aspect, an embodiment of the present application provides an electrical device, including the battery device according to the first aspect of the present application.

[0038] In the above-described embodiment, by providing the battery device of the first aspect, since the cover of the battery device is provided with ribs extending in the first direction, and the ribs are fixedly connected to the battery cell assembly, the ribs can act as a pressing strip for offsetting the expansion force generated by the battery cell when the battery cell expands, and restricting the expansion amount of the battery cell assembly in the first direction. Thus, it is not necessary to provide a pressing strip structure in the battery cell assembly, so as to reduce the number of components of the battery device, reduce the space occupied inside the battery device, and improve the energy density of the battery device. Moreover, the ribs can enhance the structural strength of the cover, reduce the probability of the cover bulging and generating abnormal noises, and can also reduce the thickness of the cover under the same strength, further improving the energy density of the battery device. Since a deformable portion that can deform in the first direction is formed on the cover, when the battery cell expands, the deformable portion can absorb the expansion force of the battery cell through deformation, thereby reducing the risk of the cover being torn and failing when the battery cell expands, and thus improving the overall performance of the electrical device.

[0039] In a third aspect, an embodiment of the present application provides an energy storage device, including the battery device according to the first aspect of the present application.

[0040] In the above-described embodiment, by providing the battery device of the first aspect, since the cover of the battery device is provided with ribs extending in the first direction, and the ribs are fixedly connected to the battery cell assembly, the ribs can act as a pressing strip for offsetting the expansion force generated by the battery cell when the battery cell expands, and restricting the expansion amount of the battery cell assembly in the first direction. Thus, it is not necessary to provide a pressing strip structure in the battery cell assembly, so as to reduce the number of components of the battery device, reduce the space occupied inside the battery device, and improve the energy density of the battery device. Moreover, the ribs can enhance the structural strength of the cover, reduce the probability of the cover bulging and generating abnormal noises, and can also reduce the thickness of the cover under the same strength, further improving the energy density of the battery device. Since a deformable portion that can deform in the first direction is formed on the cover, when the battery cell expands, the deformable portion can absorb the expansion force of the battery cell through deformation, thereby reducing the risk of the cover being torn and failing when the battery cell expands, and thus improving the overall performance of the energy storage device.

[0041] The additional aspects and advantages of the present application will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present application. Description of the Drawings

[0042] Figure 1 is a schematic diagram of a vehicle according to an embodiment of the present application; Figure 2 is an exploded view of the battery device according to an embodiment of the present application; Figure 3It is a schematic structural diagram of a battery device according to an embodiment of the present application; Figure 4 It is a sectional view taken along line A-A in Figure 3 ; Figure 5 It is Figure 4 an enlarged view of the circled part B in Figure 6 It is Figure 4 an enlarged view of the circled part C in Figure 7 It is a schematic structural diagram of the box cover and the reinforcing member of the battery device according to an embodiment of the present application; Figure 8 It is a schematic structural diagram of the battery device without the box cover according to an embodiment of the present application.

[0043] Reference numerals: 1, electrical device; 1000, battery device; 2000, controller; 3000, motor; 100, box body; 101, accommodating cavity; 110, box main body; 120, box cover; 130, reinforcing member; 140, expansion beam; 1201, body; 1202, connecting edge; 121, rib; 1211, first rib; 1212, second rib; 1213, groove; 1214, deformation part; 200, battery cell assembly; 210, battery cell; 220, conductive sheet; 211, terminal; X, first direction; Y, second direction; Z, third direction. Detailed embodiments

[0044] Hereinafter, embodiments of the technical solutions of the present application will be described in detail with reference to the drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, and thus are only examples and should not be used to limit the protection scope of the present application.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0046] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is more than two, unless otherwise specifically defined.

[0047] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0048] In the description of the embodiments of the present application, the term "and / or" is merely a description of the associated relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0049] In the description of the embodiments of the present application, the term "a plurality of" refers to more than two (including two).

[0050] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0051] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0052] In recent years, new energy vehicles have witnessed a leapfrog development. In the field of electric vehicles, the battery device, as the power source of the electric vehicle, plays an irreplaceable and important role. Among them, as a core component of new energy vehicles, the battery device has high requirements both in terms of energy density and reliability.

[0053] In related technologies, multiple battery modules are usually arranged in the box body of the battery device. The battery module has a large number of components, complex assembly, and occupies a large amount of layout space in the box body, affecting the energy density and overall performance of the battery device. At the same time, the box body includes a box main body and an upper cover covering the box main body. Since the box cover plays a role in protecting the components inside the box body, the structural strength and performance of the box cover need to be further improved.

[0054] Based on the above considerations, in order to improve the energy density of the battery device and the overall performance of the box cover, this application designs a battery device. The box cover of the battery device is provided with ribs protruding towards the accommodation cavity. The ribs extend along the first direction. The battery cell assembly includes a plurality of battery cells stacked along the first direction. The ribs are fixedly connected to the battery cell assembly. In this way, the ribs can act as a pressing strip in the battery cell assembly to offset the expansion force generated by the battery cells when the battery cells expand, and limit the expansion amount of the battery cell assembly in the first direction. Therefore, there is no need to set a pressing strip structure in the battery cell assembly to reduce the number of components, reduce space occupation, and improve the energy density of the battery device; and the ribs can enhance the structural strength of the box cover, reduce the probability of the box cover bulging and making abnormal noises, and can also reduce the thickness of the box cover under the same strength, further improving the energy density of the battery device.

[0055] The embodiment of this application provides an electrical device using the battery device of the present disclosure as a power source. The electrical device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc.

[0056] For the convenience of description in the following embodiments, taking the electrical device 1 as a vehicle as an example, the structures of the electrical device 1, the battery device 1000, and the battery cell 210 of this application will be introduced in detail.

[0057] Please refer to Figure 1 , Figure 1The power consumption device 1 provided in some embodiments of the present application is a schematic structural diagram of a vehicle. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. The vehicle is provided with a battery device 1000, and the battery device 1000 can be arranged at the bottom, head, or tail of the vehicle. The battery device 1000 can be used for power supply of the vehicle. For example, the battery device 1000 can be used as the operating power source of the vehicle. The vehicle may further include a controller 2000 and a motor 3000. The controller 2000 is used to control the battery device 1000 to supply power to the motor 3000. For example, it is used for the working power requirements during vehicle start-up, navigation, and driving. In some embodiments of the present application, the battery device 1000 can not only be used as the operating power source of the vehicle, but also be used as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0058] Reference is made below to Figures 2 - 8 describe the battery device 1000 according to the embodiment of the first aspect of the present application. Figure 2 The exploded view of the structure of the battery device 1000 provided in some embodiments of the present application. Figure 3 is a schematic structural diagram of the battery device 1000 according to the embodiment of the present application; Figure 4 is along Figure 3 The cross-sectional view of the A-A line in; Figure 5 is Figure 4 The enlarged view of the circled B in; Figure 6 is Figure 4 The enlarged view of the circled C in; Figure 7 is a schematic structural diagram of the box cover 120 and the reinforcing member 130 of the battery device 1000 according to the embodiment of the present application; Figure 8 is a schematic structural diagram of the battery device 1000 without the box cover 120 according to the embodiment of the present application.

[0059] Please refer to Figure 2 , the battery device 1000 includes a box body 100 and a battery cell assembly 200. In some embodiments, the battery device 1000 can be a battery pack, the battery pack includes a box body 100 and one or more battery cell assemblies 200, and the battery cell assembly 200 is accommodated in the box body 100.

[0060] The housing 100 may include a first housing and a second housing. The first housing and the second housing are snap-fitted together such that a closed space is formed inside the housing 100 to accommodate the battery cell assembly 200. Here, "closed" means covered or closed, which can be sealed or non-sealed. The first housing can be a top cover or a bottom plate. The housing 100 may also include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame such that a closed space is formed inside the housing 100 to accommodate the battery cell assembly 200. The housing 100 can also be part of the chassis structure of a vehicle. For example, the top cover of the housing 100 can become at least part of the floor of the vehicle, or the frame of the housing 100 can become at least part of the cross beams and longitudinal beams of the vehicle.

[0061] The battery device 1000 may include one or more battery cell assemblies 200 for providing voltage and capacity. The battery cell assembly 200 may include one or more battery cells 210. When there are multiple battery cells 210, the multiple battery cells 210 are connected in series, parallel, or in a hybrid connection through a busbar component.

[0062] In some embodiments, the battery cell assembly 200 is generally formed by arranging multiple battery cells 210; as an example, the battery cell assembly 200 can be a battery module, and the battery module is formed by arranging and fixing multiple battery cells 210 to form an independent module. As an example, the battery module can be formed by bundling multiple battery cells 210 with cable ties.

[0063] As an example, the battery cell assembly 200 can be a battery module, and the battery cell assembly 200 can be accommodated in the housing 100 by fixing the battery module to the housing 100. As an example, the battery cell assembly 200 can also be accommodated in the housing 100 by directly fixing multiple battery cells 210 to the housing 100.

[0064] The battery cells 210 mentioned in the embodiments of the present application may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, magnesium-ion batteries, etc., and the embodiments of the present application are not limited thereto. The battery cells 210 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, and the embodiments of the present application are also not limited thereto. Generally, the battery cells 210 are divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and soft-pack battery cells, and the embodiments of the present application are also not limited thereto.

[0065] Exemplarily, the battery cell 210 generally may include a housing, a cell assembly, and an electrolyte. The housing is used to accommodate the cell assembly and the electrolyte, and at least one positive electrode terminal and at least one negative electrode terminal are provided on the housing. The cell assembly includes one or more electrode assemblies, and the electrode assemblies are formed by laminating or winding a positive electrode plate, a negative electrode plate, and a separator.

[0066] The present application embodiment provides a battery device 1000, such as Figures 2 - 6 As shown, it includes: a box body 100 and a plurality of battery cell assemblies 200, the box body 100 includes a box body 110 and a box cover 120, the box body 110 and the box cover 120 are connected and cooperate to define a receiving cavity 101, the box cover 120 is provided with a convex rib 121 protruding toward the receiving cavity 101, the convex rib 121 extends along a first direction X, a part of the box cover 120 is formed as a deformation portion 1214, and the deformation portion 1214 is configured to be deformable along the first direction X; a plurality of battery cell assemblies 200 are arranged in the receiving cavity 101 and arranged along a second direction Y, the second direction Y intersects with the first direction X, each battery cell assembly 200 includes a plurality of battery cells 210 stacked along the first direction X, and the convex rib 121 is fixedly connected to the battery cell assembly 200.

[0067] like Figure 2 As shown, the box body 110 is roughly in the shape of a rectangular box with an open top. The box body 110 includes a frame beam and a bottom plate. The frame beam includes two first side beams and two second side beams. The two first side beams extend along a first direction X and are arranged at intervals in a second direction Y. The two second side beams extend along the second direction Y and are arranged at intervals in the first direction X. The two ends of the two first side beams are respectively connected to the two ends of the two second side beams to enclose a rectangular frame structure with both sides open in a third direction Z. The bottom plate is sealed at the bottom of the frame beam.

[0068] In some examples, the box body 100 may further include a bottom guard plate, which is connected to the box body 110 and is located on a side of the bottom plate that is away from the frame beam.

[0069] In some examples, the box cover 120 is connected to the box body 110. For example, the box cover 120 and the box body 110 may be connected by fasteners, snap-fit ​​connections, adhesive connections, and / or fixedly connected by magnetic elements.

[0070] like Figure 2 As shown, the third direction Z is the up-down direction of the battery device 1000, the box cover 120 is provided on the upper side of the box body 110, and the lower surface of the box cover 120 is provided with a convex rib 121, wherein the convex rib 121 can be integrally formed with the box cover 120, or the convex rib 121 can be a separate part from the box cover 120, and connected and fixed as a whole by welding, bonding, etc. The convex rib 121 is a long strip extending along the first direction X, for example, the convex rib 121 can extend from one end of the box cover 120 in the first direction X to the other end. Further, the number of the convex rib 121 can be one or a plurality of convex ribs arranged at intervals. When the number of the convex ribs 121 is a plurality, the plurality of convex ribs 121 can be arranged in sequence along the second direction Y, for example, the number of the convex ribs 121 can be two, three, four, five, six, seven, eight, ten or more.

[0071] The battery cell assembly 200 includes a plurality of battery cells 210. For example, the battery cell assembly 200 may include five, eight, ten, twelve, fifteen, eighteen, twenty, twenty-five, thirty or more battery cells 210. The plurality of battery cells 210 in the battery cell assembly 200 are arranged in sequence in the thickness direction (e.g., Figure 2 the first direction X shown in ). The battery device 1000 includes a plurality of battery cell assemblies 200. For example, the battery device 1000 may include two, three, four, five, six, seven, eight or more battery cell assemblies 200. The plurality of battery cell assemblies 200 are arranged in sequence in the length direction of the battery cell 210 (e.g., Figure 2 the second direction Y shown in ). In this embodiment, the battery cell assembly 200 is a battery module.

[0072] The rib 121 is fixedly connected to the battery cell assembly 200, that is: the cover 120 is fixedly connected to the battery cell assembly 200 through the rib 121. For example, the rib 121 is adhesively connected or fixedly connected to the battery cell assembly 200 by other means.

[0073] In this embodiment, since the rib 121 extends along the stacking direction of the plurality of battery cells 210 in the battery cell assembly 200 and is fixedly connected to the battery cell assembly 200, when the battery cells 210 in the battery cell assembly 200 expand, the rib 121 and the cover 120 can play a role in restricting and offsetting the expansion force of the battery cell assembly 200 in the first direction X, that is, it can play the role of the pressing strip in the battery module, so that the pressing strip structure of the battery cell assembly 200 can be cancelled. Thus, not only can the number of components in the battery cell assembly 200 be reduced, the assembly efficiency be improved, the cost be reduced, but also the space occupation can be reduced, the space utilization rate inside the battery device 1000 be improved, the structure be compacted, and the energy density of the battery device 1000 be increased.

[0074] At the same time, since the rib 121 is formed on the cover 120, the rib 121 can enhance the structural strength of the cover 120, improve the anti-deformation ability and anti-fatigue performance of the cover 120, and improve the protection effect on the components inside the box body 100. And by setting the rib 121, the thickness of the cover 120 can be thinned under the same structural strength, so that the cost of the cover 120 can be reduced, the weight of the battery device 1000 can be further reduced, and the energy density of the battery device 1000 can be increased.

[0075] In addition, since the cover 120 is fixedly connected to the battery cell assembly 200 through the rib 121, the structural strength of the cover 120 can be further enhanced, the probability of the cover 120 bulging and making abnormal noises can be reduced, and the overall performance of the battery device 1000 can be improved.

[0076] Among them, the deformation part 1214 can undergo elastic deformation or inelastic deformation along the first direction X.

[0077] In some examples, the number of the deformation parts 1214 can be one or multiple. Among them, the number of the deformation parts 1214 can be reasonably set according to the design requirements of the lid 120.

[0078] In some examples, the deformation part 1214 can adopt a deformable elastic material piece, and the deformation part 1214 can also be set as a corrugated structure or a bent structure bent along the third direction Z.

[0079] In the above technical solution, since the deformation part 1214 that can undergo deformation along the first direction X is formed on the lid 120, when the battery cell 210 expands, the deformation part 1214 can absorb the expansion force of the battery cell 210 through deformation, thereby reducing the risk of the lid 120 being cracked and failing when the battery cell 210 expands.

[0080] In the above technical solution, since the rib 121 extending along the first direction X is provided on the lid 120, and the rib 121 is fixedly connected to the battery cell assembly 200, the rib 121 can function as a pressure bar in the battery cell assembly 200, and is used to offset the expansion force generated by the battery cell 210 when the battery cell 210 expands, and limit the expansion amount of the battery cell assembly 200 in the first direction X. Thus, it is possible not to provide a pressure bar structure in the battery cell assembly 200, reduce the number of components, reduce the space occupation, and improve the energy density of the battery device 1000; and the rib 121 can enhance the structural strength of the lid 120, reduce the probability of the lid 120 bulging and generating abnormal noises, and can also reduce the thickness of the lid 120 under the same strength, further improving the energy density of the battery device 1000. When the battery cell 210 expands, the deformation part 1214 can absorb the expansion force of the battery cell 210 through deformation, thereby reducing the risk of the lid 120 being cracked and failing when the battery cell 210 expands.

[0081] In some embodiments of the present application, as Figure 2 and Figure 3 shown, in the first direction X, the two ends of the rib 121 are respectively flush with the two ends of the battery cell assembly 200 or respectively extend beyond the two ends of the battery cell assembly 200.

[0082] For example Figure 2As shown, the first direction X is the front-back direction of the battery device 1000. The rib 121 extends in the front-back direction. The front end of the rib 121 is flush with the front end of the battery cell assembly 200, or extends forward beyond the front end of the battery cell assembly 200. The rear end of the rib 121 is flush with the rear end of the battery cell assembly 200, or extends backward beyond the rear end of the battery cell assembly 200.

[0083] In the above technical solution, by making the two ends of the rib 121 flush with or beyond the two ends of the battery cell assembly 200 respectively, the rib 121 can completely cover a plurality of battery cells 210 of the battery cell assembly 200 in the first direction X. Thus, the rib 121 can offset the expansion force generated by any one of the battery cells 210, limit the expansion amount of any one of the battery cells 210, thereby reducing the displacement of the battery cells 210 and reducing the probability of local stress concentration.

[0084] In some embodiments of the present application, as Figure 2 and Figure 4 shown, the rib 121 is fixedly connected to a plurality of battery cells 210 in the battery cell assembly 200.

[0085] For example, the rib 121 is adhesively connected to each battery cell 210.

[0086] In the above technical solution, by fixedly connecting the rib 121 to each battery cell 210 in the battery cell assembly 200, not only can the connection reliability between the rib 121 and the battery cell assembly 200 be further improved, but also the forces on the plurality of battery cells 210 can be made more uniform, reducing the probability of relative displacement of the battery cells 210 caused by vibration or impact of the battery device 1000, reducing the risk of fracture of the pole posts 211 of the battery cells 210, and enhancing the structural strength and reliability of the battery device 1000.

[0087] In some embodiments of the present application, as Figures 4 - 6 shown, the rib 121 is adhesively connected to the battery cell assembly 200 with structural adhesive.

[0088] In the above technical solution, the rib 121 is adhesively connected to the battery cell assembly 200 through structural adhesive. This can not only simplify the connection structure between the rib 121 and the battery cell assembly 200, improve the assembly efficiency, but also enhance the connection strength between the battery cell assembly 200 and the rib 121, ensure the anti-expansion effect of the battery cell assembly 200 by the rib 121 of the lid 120, further reduce the probability of the lid 120 bulging and making abnormal noises, and also improve the structural strength and sealing performance between the lid 120 and the battery cell assembly 200. In addition, since the rib 121 on the lid 120 is directly adhesively connected to the battery cell assembly 200 through structural adhesive, in this way, the insulating film and / or buffer structural member (foam) between the lid 120 and the battery cell assembly 200 can be cancelled. Thus, the components in the battery device 1000 can be further reduced, the space utilization rate in the battery device 1000 can be improved, the cost can be reduced, and the assembly efficiency can be enhanced.

[0089] In some embodiments of the present application, as Figure 2 and Figure 3 shown, the number of ribs 121 is multiple, and the multiple ribs 121 are arranged along the second direction Y.

[0090] For example, the number of ribs 121 can be two, three, four, five, six, seven, eight, ten or more, etc. In some examples, the multiple ribs 121 can be evenly spaced in the second direction Y, or at least two ribs 121 are connected and arranged in the second direction Y.

[0091] In some examples, the multiple ribs 121 can correspond to the multiple battery cell assemblies 200 one by one. In other examples, each battery cell assembly 200 can be connected to one or more ribs 121. When a battery cell assembly 200 is connected to multiple ribs 121, the anti-expansion effect on the battery cell assembly 200 can be improved. In some examples, one rib 121 can be fixedly connected to only one battery cell assembly 200, and one rib 121 can also be fixedly connected to two adjacent battery cell assemblies 200.

[0092] In the above technical solution, by providing multiple ribs 121, not only can the anti-expansion effect on the battery cell assembly 200 be further improved, but also the structural strength of the lid 120 can be further enhanced, the probability of the lid 120 bulging and making abnormal noises can be reduced, and the reliability of the battery device 1000 can be further improved.

[0093] In some embodiments of the present application, as Figure 2 , Figure 5 and Figure 7As shown, a portion of the plurality of convex ribs 121 is formed as a first convex rib 1211 , and a battery cell shoulder on at least one side of the shell of the battery cell 210 in the second direction Y is fixedly connected to the first convex rib 1211 .

[0094] That is, a first rib 1211 may be provided on one or both sides of the battery cell assembly 200 in the second direction Y, and the first rib 1211 is fixedly connected to the shell of the battery cell 210 , for example, the first rib 1211 is bonded to the shell of the battery cell 210 by a structural adhesive.

[0095] The “cell shoulder” refers to an area on the side surface of the shell of the battery cell 210 facing the box cover 120 , close to the two end edges of the shell in the second direction Y, which is the cell shoulder of the shell of the battery cell 210 .

[0096] Reference Figure 4 , Figure 5 and Figure 8 As shown, two poles 211 are provided on the side of the battery cell 210 facing the box cover 120, and the two poles 211 are arranged at intervals along the second direction Y, and an explosion-proof valve is provided between the two poles 211. Among them, on the surface of the side of the shell of the battery cell 210 facing the box cover 120, the area located on the side of the two poles 211 away from the explosion-proof valve in the length direction of the battery cell 210 is the battery cell shoulder of the shell of the battery cell 210, and the first convex rib 1211 is fixedly connected to the battery cell shoulder of the shell of the battery cell 210, for example, the first convex rib 1211 is connected to the battery cell shoulder of the shell of the battery cell 210 by bonding with a structural adhesive.

[0097] The first rib 1211 and the pole 211 are spaced apart in the length direction of the battery cell 210. Furthermore, when the pole 211 is connected to the conductive sheet 220, the first rib 1211 and the conductive sheet 220 are spaced apart in the length direction of the battery cell 210. Thus, the probability of interference between the first rib 1211 and the pole 211 and the conductive sheet 220 can be reduced, making the structural arrangement more compact and reasonable.

[0098] In some examples, the number of the first convex ribs 1211 may be two, three, four, five, six, seven, eight, ten or more. In some examples, a plurality of battery cell assemblies 200 may be provided in one-to-one correspondence with a plurality of first convex ribs 1211, or each battery cell assembly 200 may be provided with two first convex ribs 1211, and the two first convex ribs 1211 are respectively provided at the battery cell shoulder positions at both ends of the corresponding battery cell assembly 200 in the second direction Y.

[0099] In the above technical solution, by directly fixedly connecting the cell shoulders on at least one side of the housing of the battery cell 210 in the second direction Y to the first rib 1211, the connection and fixation effect between the first rib 1211 and the battery cell 210 can be improved, the anti-expansion effect on the battery cell 210 can be enhanced, the deformation amount and displacement amount of the battery cell 210 can be reduced, and the probability of interference between the first rib 1211 and the pole 211 and the conductive sheet 220 of the battery cell 210 can also be reduced, the structure is compacted, and the space utilization rate in the battery device 1000 is improved.

[0100] In some embodiments of the present application, as Figure 4 shown, the first rib 1211 is disposed between two adjacent battery cell assemblies 200 and is fixedly connected to both of the two adjacent battery cell assemblies 200.

[0101] For example, in the second direction Y, one first rib 1211 can cover the cell shoulders of the housings of two adjacent battery cells 210 and is fixedly connected to the cell shoulders of the housings of the two adjacent battery cells 210. In some other embodiments, two first ribs 1211 can be provided between two adjacent battery cell assemblies 200, and the two first ribs 1211 are respectively connected in one-to-one correspondence with the cell shoulders of the housings of the battery cells 210 of the two battery cell assemblies 200.

[0102] In the above technical solution, by disposing one first rib 1211 on two battery cell assemblies 200 and simultaneously connecting the two adjacent battery cell assemblies 200 arranged adjacent to each other, the number of first ribs 1211 on the box cover 120 can be reduced, the structure of the box cover 120 can be simplified, and the processing difficulty of the box cover 120 can be reduced.

[0103] In some embodiments of the present application, as Figure 6 and Figure 8 shown, the battery cell assembly 200 further includes: a conductive sheet 220 connected to the pole 211 of the battery cell 210, and a part of the plurality of ribs 121 is formed as a second rib 1212, and the second rib 1212 is fixedly connected to the conductive sheet 220.

[0104] In some examples, the conductive sheet 220 is a bus bar. The plurality of battery cells 210 in the battery cell assembly 200 are connected through the conductive sheet 220 to achieve series or parallel connection between any two of the plurality of battery cells 210. Among them, the conductive sheet 220 is connected between the poles 211 of two battery cells 210.

[0105] In some examples, the number of the second ribs 1212 may be two, three, four, five, six, seven, eight, ten or more. In some examples, a plurality of battery cell assemblies 200 may be provided in one-to-one correspondence with a plurality of second ribs 1212, or each battery cell assembly 200 may be provided with two or more second ribs 1212.

[0106] In some examples, the conductive sheet 220 and the pole 211 of the battery cell 210 may be connected by welding, and the conductive sheet 220 and the second rib 1212 may be connected by bonding with a structural adhesive.

[0107] In the above technical solution, by fixedly connecting the conductive sheet 220 of the battery cell assembly 200 to the second rib 1212 on the box cover 120, the connection area between the box cover 120 and the battery cell assembly 200 can be increased, the anti-expansion effect of the box cover 120 on the battery cell assembly 200 can be enhanced, the deformation and displacement of the battery cell 210 can be reduced, and the structural strength of the box cover 120 can be further improved, reducing the probability of deformation of the box cover 120 and abnormal noise.

[0108] In some embodiments of the present application, Figures 5 - 7 As shown, the convex rib 121 is formed by a portion of the box cover 120 being recessed toward the accommodating cavity 101 .

[0109] In some examples, the first convex rib 1211 and the second convex rib 1212 are both formed by the box cover 120 being recessed toward the accommodating cavity 101, wherein, in the recessed direction of the first convex rib 1211, the height of the first convex rib 1211 protruding toward the accommodating cavity 101 is greater than the height of the second convex rib 1212 protruding toward the accommodating cavity 101. Thus, the heights of the first convex rib 1211 and the second convex rib 1212 can be adapted to the cell shoulder of the shell of the battery cell 210 and the conductive sheet 220, respectively, so as to facilitate the first convex rib 1211 and the second convex rib 1212 to connect the cell shoulder of the shell of the battery cell 210 and the conductive sheet 220, respectively.

[0110] In the above technical solution, by forming the convex rib 121 from a part of the box cover 120 to be recessed into the accommodating cavity 101, the material usage of the box cover 120 can be reduced. While maintaining the structural strength of the box cover 120, the lightweight design of the box cover 120 can be achieved, the production cost of the box cover 120 can be reduced, and the energy density of the battery device 1000 can be improved.

[0111] In some embodiments of the present application, Figure 5 As shown, the rib 121 defines a groove 1213 on a side away from the accommodating cavity 101 , and the box body 100 further includes a reinforcing member 130 , which extends along the first direction X and is fixed in the groove 1213 .

[0112] For example, the reinforcing member 130 may be in a strip shape extending along the first direction X, where the width of the reinforcing member 130 may be less than or equal to the width of the groove 1213, and the length of the reinforcing member 130 may be less than or equal to the length of the groove 1213. In this way, the structural strength of the lid 120 can be further improved to the maximum extent.

[0113] In some examples, at least one reinforcing member 130 is disposed in the groove 1213, or each groove 1213 is provided with a reinforcing member 130, and the plurality of reinforcing members 130 correspond to the plurality of grooves 1213 one by one.

[0114] In some examples, the reinforcing member 130 and the lid 120 may be connected by bonding, snap connection, riveting connection or welding connection. The reinforcing member 130 may also be fixed to the lid 120 integrally by injection molding.

[0115] In the above technical solution, by disposing the reinforcing member 130 in the groove 1213 defined by the rib 121, the reinforcing member 130 can significantly improve the structural strength of the rib 121, improve the structural strength of the lid 120, improve the anti-expansion effect of the lid 120 on the battery cell assembly 200, and also improve the anti-external impact ability of the lid 120, reduce the probability of the lid 120 bending, deforming, breaking and generating abnormal noises, and improve the service life of the battery device 1000.

[0116] In some embodiments of the present application, as Figure 5 and Figure 7 shown, the reinforcing member 130 is a steel material part or a long fiber reinforced composite material part.

[0117] For example, the reinforcing member 130 may be a long fiber reinforced thermoplastic part, a long fiber reinforced epoxy resin composite material part, a long fiber reinforced phenolic resin composite material part or a long fiber reinforced vinyl ester resin composite material, etc.

[0118] In the above technical solution, when the reinforcing member 130 is a steel material part, the strength and hardness of the reinforcing member 130 can be significantly improved, and the anti-deformation ability of the lid 120 can be improved, so that the structure of the lid 120 remains stable. When the reinforcing member 130 is a fiber reinforced composite material part, the structural strength of the reinforcing member 130 can be improved, and the weight of the reinforcing member 130 can be reduced, realizing the lightweight of the lid 120 and improving the energy density of the battery device 1000.

[0119] In some embodiments of the present application, as Figure 3 and Figure 7 shown, the deformation part 1214 is formed as a concave rib extending along the second direction Y and recessed toward the accommodation cavity 101. In the third direction Z, there is a gap between the concave rib and the battery cell assembly 200, and the third direction Z intersects both the first direction X and the second direction Y.

[0120] In some examples, both ends of the concave rib forming the deformation part 1214 can extend to the two side edge regions of the box cover 120 in the second direction Y. The concave rib forming the deformation part 1214 can be cross-connected with the first convex rib 1211 and the second convex rib 1212. By setting the deformation part 1214 as a concave rib recessed toward the accommodation cavity 101, on the one hand, the strength and stiffness of the box cover 120 in the second direction Y can be enhanced, and the anti-deformation ability of the box cover 120 in the second direction Y can be improved. On the other hand, it is convenient for the box cover 120 to undergo elongation deformation along the first direction X at the position of the concave rib, so as to absorb the expansion force of the battery cell 210 and reduce the risk of the box cover 120 being torn by the expansion force.

[0121] In some examples, the surface of the concave rib facing the battery cell assembly 200 is not in contact with the battery cell assembly 200. Thus, the risk of interference between the deformation part 1214 and the battery cell assembly 200 can be reduced. In some examples, the height of the deformation part 1214 protruding toward the accommodation cavity 101 is less than or equal to the height of the second convex rib 1212 protruding toward the accommodation cavity 101.

[0122] In the above technical solution, since the deformation part 1214 is formed as a concave rib recessed toward the accommodation cavity 101 and has a gap with the battery cell assembly 200, the structure of the deformation part 1214 can be simplified, the processing and forming of the deformation part 1214 can be facilitated, the probability of interference between the deformation part 1214 and the battery cell assembly 200 can also be reduced, and the stability of the battery device 1000 can be improved.

[0123] In some embodiments of the present application, as Figure 3 and Figure 7 shown, the number of the deformation parts 1214 is multiple, and the multiple deformation parts 1214 are arranged at intervals along the first direction X.

[0124] For example, the number of the deformation parts 1214 can be two, three, four, five, six, seven, eight, ten or more, etc.

[0125] In the above technical solution, by setting multiple deformation parts 1214, the deformable amount of the box cover 120 in the first direction X can be increased, the absorption effect on the expansion force of the battery cell 210 can be improved, and the risk of the box cover 120 being torn and failing can be further reduced.

[0126] In some embodiments of the present application, the box cover 120 is a fiber-reinforced composite material part, and the fibers in the box cover 120 extend along the first direction X; or, the box cover 120 is a plastic part or a metal part.

[0127] In some examples, the lid 120 is a fiber-reinforced composite material part. The fiber-reinforced composite material part is light in weight, high in strength and stiffness, which can improve the structural strength of the lid 120, reduce the weight of the lid 120, and increase the energy density of the battery device 1000. Further, the fibers in the lid 120 extend along the first direction X, which can facilitate the processing and forming of the first rib 1211 and the second rib 1212 and reduce the processing difficulty.

[0128] In some examples, the lid 120 is a plastic part, which can reduce the weight of the lid 120, lower the cost, and insulate the lid 120 from the battery cell assembly 200 electrically. In some examples, the lid 120 is a metal part, which can improve the structural strength of the lid 120.

[0129] In the above technical solution, since the lid 120 is a fiber-reinforced composite material part, a plastic part or a metal part, it can improve the structural strength of the lid 120, reduce the cost of the lid 120, and also select a suitable material for the lid 120 according to the design requirements to improve the applicability of the lid 120.

[0130] In some embodiments of the present application, as Figure 2 and Figure 8 shown, the peripheral edge of the lid 120 is adhesively connected to the box body 110 through an adhesive layer. The adhesive layer is a structural adhesive layer and extends circumferentially along the lid 120 to form a ring.

[0131] In some examples, the lid 120 includes a body 1201 and a connecting edge 1202. The connecting edge 1202 is connected to the peripheral edge of the body 1201 and extends circumferentially along the body 1201 to form a ring. The connecting edge 1202 and the body 1201 are arranged at intervals in the thickness direction of the lid 120, and the connecting edge 1202 is located on the side of the body 1201 facing the accommodation cavity 101. Among them, the first rib 1211 and the second rib 1212 are both formed on the body 1201. In the first direction X, the two end edges of the first rib 1211 and the two end edges of the second rib 1212 are respectively flush with the two end edges of the body 1201. The deformation part 1214 is formed on the body 1201. In the second direction Y, the two end edges of the deformation part 1214 are respectively flush with the two side edges of the body 1201.

[0132] In some examples, the connecting edge 1202 is adhesively connected to the box body 110 through an adhesive layer. Further, the adhesive layer can completely cover the surface of the connecting edge 1202 facing the box body 110 to increase the connection area and enhance the connection strength and sealing performance between the lid 120 and the box body 110.

[0133] In the above technical solution, the periphery of the box cover 120 and the box body 110 are adhesively connected through a structural adhesive layer, which can not only improve the connection strength between the box cover 120 and the box body 110, but also enhance the sealing performance of the connection position between the box body 110 and the box cover 120, and improve the overall sealing performance of the box body 100. In addition, the number of components of the battery device 1000 can be reduced, and the assembly efficiency can be improved.

[0134] In some embodiments of the present application, as Figure 2 and Figure 8 shown, the box body 100 further includes: two expansion beams 140, the two expansion beams 140 extend along the second direction Y and are arranged at intervals in the first direction X, and a plurality of battery cell assemblies 200 are all arranged between the two expansion beams 140.

[0135] In the above technical solution, by arranging a plurality of battery cell assemblies 200 between the two expansion beams 140, the expansion amount of the battery cell assemblies 200 in the first direction X can be restricted by the expansion beams 140, the deformation and displacement of the battery cells 210 can be reduced, and the stability of the battery device 1000 can be improved.

[0136] In a second aspect, an electric device 1 according to an embodiment of the present application further includes the battery device 1000 of any one of the above embodiments.

[0137] In the above technical solution, since the electric device 1 is provided with the battery device 1000 as described above, and since a rib 121 extending along the first direction X is provided on the box cover 120 of the battery device 1000, the rib 121 is fixedly connected to the battery cell assembly 200, and the rib 121 can act as a pressing strip to offset the expansion force generated by the battery cell 210 when the battery cell 210 expands, and restrict the expansion amount of the battery cell assembly 200 in the first direction X. Thus, it is not necessary to provide a pressing strip structure in the battery cell assembly 200 to reduce the number of components of the battery device 1000, reduce the space occupied inside the battery device 1000, and improve the energy density of the battery device 1000; and the rib 121 can enhance the structural strength of the box cover 120, reduce the probability of the box cover 120 bulging and making abnormal noises, and can also reduce the thickness of the box cover 120 under the same strength, further improving the energy density of the battery device 1000, thereby improving the overall performance of the electric device 1.

[0138] In a third aspect, an energy storage device according to an embodiment of the present application further includes the battery device 1000 of any one of the above embodiments.

[0139] In some embodiments, the energy storage device includes a box body 100, and at least one side of the box body 100 is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0140] In the above technical solution, since the energy storage device is provided with the battery device 1000 as described above, and since the cover 120 of the battery device 1000 is provided with ribs 121 extending along the first direction X, the ribs 121 are fixedly connected to the battery cell assembly 200, and the ribs 121 can act as a pressing strip to offset the expansion force generated by the battery cell 210 when the battery cell 210 expands, and limit the expansion amount of the battery cell assembly 200 in the first direction X. Thus, it is not necessary to provide a pressing strip structure in the battery cell assembly 200, so as to reduce the number of components of the battery device 1000, reduce the space occupied inside the battery device 1000, and improve the energy density of the battery device 1000; and the ribs 121 can enhance the structural strength of the cover 120, reduce the probability of the cover 120 bulging and making abnormal noises, and can also reduce the thickness of the cover 120 under the same strength, further improving the energy density of the battery device 1000, thereby improving the overall performance of the energy storage device.

[0141] Next, reference will be made to Figures 1 - 8 Describe the battery device 1000 according to a specific embodiment of the present application.

[0142] Referring to Figure 2 , the battery device 1000 includes: a box body 100 and a battery cell assembly 200.

[0143] As Figure 2 shown, the box body 100, as the main load-bearing structure of the battery device 1000, is usually made of high-strength aluminum alloy or steel material, and has good mechanical strength and lightweight characteristics. An accommodation cavity 101 is designed inside the box body 100 for fixing the battery cell assembly 200 and providing necessary protection for the battery cell assembly 200. In some examples, an anti-collision beam or reinforcing ribs are provided at the bottom of the box body 100 to improve the overall rigidity of the box body 100 and protect the battery cells 210 in the accommodation cavity 101 in extreme cases (such as vehicle collision).

[0144] The box body 100 includes a box main body 110 and a box cover 120. The box main body 110 and the box cover 120 are connected and cooperate to define the accommodation cavity 101. The box main body 110 is generally in the shape of a cuboid box with an open top. Two expansion beams 140 are provided inside the box main body 110. The two expansion beams 140 extend along the second direction Y and are arranged at intervals in the first direction X. The box cover 120 is covered on the top of the box main body 110.

[0145] A plurality of battery cell assemblies 200 are disposed between two expansion beams 140. The battery cell assembly 200 can be a battery module. The battery cell assembly 200 is the core functional unit of the battery device 1000 and is composed of a plurality of battery cells 210 and conductive sheets 220. The plurality of battery cells 210 are connected in series and parallel through the conductive sheets 220 to achieve the voltage and capacity required by the battery device 1000. The conductive sheet 220 is used for electrical connection between the battery cells 210, and the material of the conductive sheet 220 is usually copper or aluminum. The plurality of battery cells 210 in the battery cell assembly 200 are arranged in layers in sequence along the first direction X. The plurality of battery cell assemblies 200 are arranged in sequence along the second direction Y.

[0146] The box cover 120 includes a main body 1201 and a connecting edge 1202. The connecting edge 1202 is connected to the periphery of the main body 1201 and extends circumferentially along the main body 1201 to form a ring. The connecting edge 1202 and the main body 1201 are arranged at intervals in the thickness direction of the box cover 120, and the connecting edge 1202 is located on the side of the main body 1201 facing the accommodation cavity 101. The connecting edge 1202 and the box main body 110 are adhesively connected by structural adhesive.

[0147] A plurality of first ribs 1211 and a plurality of concave ribs (deformation portions 1214) that are recessed toward the inside of the accommodation cavity 101 are formed on the main body 1201. Among them, the plurality of ribs 121 extend along the first direction X and are arranged at intervals in the second direction Y. The plurality of ribs 121 include a first rib 1211 and a second rib 1212. In the first direction X, the two end edges of the first rib 1211 and the two end edges of the second rib 1212 are flush with the two end edges of the main body 1201 respectively. The plurality of concave ribs (deformation portions 1214) extend along the second direction Y and are arranged at intervals in the first direction X. In the second direction Y, the two end edges of the plurality of concave ribs (deformation portions 1214) are flush with the two side edges of the main body 1201 respectively.

[0148] Among them, the first rib 1211 and the end portions (shoulder regions of the battery cells 210) of the plurality of battery cells 210 in the battery cell assembly 200 in the second direction Y are adhesively fixed by structural adhesive. The second rib 1212 and the plurality of conductive sheets 220 of the battery cell assembly 200 are adhesively fixed by structural adhesive. There is a gap between the concave rib (deformation portion 1214) and the battery cell assembly 200.

[0149] Furthermore, the rib 121 is formed by recessing a part of the box cover 120 toward the inside of the accommodation cavity 101. The rib 121 defines a groove 1213 on the upper surface of the box cover 120, and a reinforcing member 130 extending along the first direction X can be arranged in the groove 1213 to further enhance the structural strength of the box cover 120.

[0150] In this embodiment, the peripheries of the box cover 120 and the box body 110 are bonded with structural adhesive to form a sealed cavity structure, eliminating the use of bolt fasteners, reducing the number of components, and improving the assembly efficiency and the sealing performance of the box body 100. The top of the battery cell assembly 200 is bonded to the box cover 120 with structural adhesive. The bonding interfaces are "the shoulder area of the battery cell 210 - the first rib 1211 on the box cover 120" and "the conductive sheet 220 - the second rib 1212 on the box cover 120". The use of insulating parts and foam is eliminated between the box cover 120 and the battery cell assembly 200, reducing the number of components and enhancing the space utilization rate within the battery device 1000.

[0151] In this embodiment, there is no independent load-bearing structure design for resisting the expansion force of the battery cells in the battery cell assembly 200. The expansion force generated by the battery cells 210 in the battery cell assembly 200 is mainly absorbed by the two expansion beams 140 in the box body 100, the first rib 1211 and the second rib 1212 on the box cover 120. That is, the box cover 120 integrates the function of a load-bearing structure for resisting the expansion force of the battery cells 210. Moreover, the concave rib extending along the second direction Y on the box cover 120 can be used to absorb the expansion force generated by the battery cells 210 and transfer the tensile force in the first direction X on the box cover 120, reducing the probability of the box cover 120 cracking and failing due to the tensile force in the first direction X. In addition, the box cover 120 and the battery cell assembly 200 are adhesively connected with structural adhesive, which can improve problems such as poor contour of the box cover 120 and abnormal noise of the box cover 120.

[0152] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, not to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: A box body (100), the box body (100) comprising a box body (110) and a box cover (120), the box body (110) and the box cover (120) being connected and cooperating to define a receiving cavity (101), the box cover (120) being provided with a convex rib (121) protruding toward the receiving cavity (101), the convex rib (121) extending along a first direction (X), a portion of the box cover (120) being formed as a deformation portion (1214), the deformation portion (1214) being configured to be deformable along the first direction (X); A plurality of battery cell assemblies (200), the plurality of battery cell assemblies (200) being arranged in the accommodating cavity (101) and arranged along a second direction (Y), the second direction (Y) intersecting the first direction (X), each of the battery cell assemblies (200) comprising a plurality of battery cells (210) stacked and arranged along the first direction (X), the convex rib (121) being fixedly connected to the battery cell assembly (200).

2. The battery device according to claim 1, characterized in that, In the first direction (X), two ends of the convex rib (121) are respectively flush with two ends of the battery cell assembly (200) or respectively exceed two ends of the battery cell assembly (200).

3. The battery device according to claim 1, characterized in that, The convex rib (121) is fixedly connected to a plurality of the battery cells (210) in the battery cell assembly (200).

4. The battery device according to claim 1, wherein The convex rib (121) is bonded and connected to the battery cell assembly (200) by means of structural adhesive.

5. The battery device according to claim 1, characterized in that, The number of the convex ribs (121) is multiple, and the multiple convex ribs (121) are arranged along the second direction (Y).

6. The battery device according to claim 5, characterized in that, A portion of the plurality of convex ribs (121) is formed into a first convex rib (1211), and a cell shoulder on at least one side of the shell of the battery cell (210) in the second direction (Y) is fixedly connected to the first convex rib (1211).

7. The battery device according to claim 6, characterized in that, The first convex rib (1211) is disposed between two adjacent battery monomer assemblies (200), and is fixedly connected to the two adjacent battery monomer assemblies (200).

8. The battery device according to claim 5, characterized in that The battery cell assembly (200) further comprises: a conductive sheet (220) connected to the pole (211) of the battery cell (210); a portion of the plurality of convex ribs (121) is formed into a second convex rib (1212); and the second convex rib (1212) is fixedly connected to the conductive sheet (220).

9. The battery device according to any one of claims 1-8, characterized in that, The convex rib (121) is formed by a portion of the box cover (120) being recessed toward the accommodating cavity (101).

10. The battery device according to claim 9, wherein, The convex rib (121) defines a groove (1213) on a side facing away from the accommodating cavity (101), and the box body (100) further comprises a reinforcing member (130), wherein the reinforcing member (130) extends along a first direction (X) and is fixed in the groove (1213).

11. The battery device according to claim 10, wherein, The reinforcement member (130) is a steel member or a long fiber reinforced composite material member.

12. The battery device according to any one of claims 1-8, characterized in that, The deformation part (1214) is formed as a concave rib extending along the second direction (Y) and recessed towards the accommodation cavity (101). In the third direction (Z), there is a gap between the concave rib and the battery cell assembly (200), and the third direction (Z) intersects both the first direction (X) and the second direction (Y).

13. The battery device according to any one of claims 1-8, characterized in that, The number of the deformation parts (1214) is multiple, and the multiple deformation parts (1214) are arranged at intervals along the first direction (X).

14. The battery device according to claim 1, characterized in that, The box cover (120) is a fiber-reinforced composite material part, and the fibers in the box cover (120) extend along the first direction (X); or, the box cover (120) is a plastic part or a metal part.

15. The battery device according to claim 1, characterized in that, The peripheral edge of the box cover (120) is adhesively connected to the box body (110) through an adhesive layer, and the adhesive layer is a structural adhesive layer and extends circumferentially along the box cover (120) to form a ring.

16. The battery device according to claim 1, characterized in that, The box body (100) further includes: two expansion beams (140), the two expansion beams (140) extend along the second direction (Y) and are arranged at intervals in the first direction (X), and multiple battery cell assemblies (200) are all arranged between the two expansion beams (140).

17. An electrical device, characterized in that, Including the battery device (1000) according to any one of claims 1-16.

18. An energy storage device, characterized in that, Including the battery device (1000) according to any one of claims 1-16.

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