Battery devices, power consumption devices and energy storage devices

Abstract

The present application discloses a battery device, an electrical device, and an energy storage device, wherein the battery device comprises: a box body, the box body comprising a box body and a box cover, the box body and the box cover being connected and cooperating to define a receiving cavity, the box cover being provided with a convex rib protruding toward the receiving cavity, the convex rib extending along a first direction, a portion of the box cover being formed as a deformation portion, and the deformation portion being configured to be deformable along the first direction; a plurality of battery cell assemblies being provided in the receiving cavity and arranged along a second direction, each battery cell assembly comprising a plurality of battery cells stacked along the first direction, the convex rib being fixedly connected to the battery cell assembly. In the above technical solution, the convex rib can function as a pressure strip in the battery cell assembly, thereby eliminating the need to provide a pressure strip structure in the battery cell assembly, reducing the number of components, reducing space occupancy, and improving the energy density of the battery device; the convex rib can enhance the structural strength of the box cover and reduce the probability of bulging and abnormal noise occurring on the box cover.

Description

Technical Field

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

[0002] In recent years, new energy vehicles have experienced rapid development. In this field, batteries, as the power source of electric vehicles, play an irreplaceable and important role. As core components of new energy vehicles, batteries have high requirements in terms of both energy density and reliability.

[0003] In related art, a battery device housing typically houses multiple battery modules. These modules have numerous components, making assembly complex and occupying considerable space within the housing, impacting the energy density and overall performance of the battery device. Furthermore, the housing, which includes a main body and a cover that seals the main body, needs further improvement in both structural strength and performance, as the cover protects the components within. Summary of the Invention

[0004] This application aims to solve at least one of the technical problems existing in the prior art. To this end, this application proposes a battery device, an electrical device, and an energy storage device incorporating the 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 eliminate the need for a bead structure in the battery cell assembly, thereby reducing the number of components, reducing space usage, and improving the energy density of the battery device.

[0005] In the first aspect, an embodiment of the present application provides a battery device, comprising: a box body, the box body comprising a box body and a box cover, the box body and the box cover are connected and cooperate to define a accommodating cavity, the box cover is provided with a convex rib protruding toward the accommodating cavity, the convex rib extends along a first direction, a portion of the box cover is formed as a deformation portion, and the deformation portion 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 accommodating cavity and arranged along a second direction, the second direction intersecting with the first direction, each of the battery cell assemblies comprising a plurality of battery cells stacked along the first direction, and the convex rib is fixedly connected to the battery cell assembly.

[0006] In the above technical solution, because the case cover is provided with a rib extending in a first direction and fixedly connected to the battery cell assembly, the rib can function as a pressure strip within the battery cell assembly, offsetting the expansion force generated by the battery cell when it expands, thereby limiting the amount of expansion of the battery cell assembly in the first direction. This eliminates the need for a pressure strip structure within the battery cell assembly, reducing the number of components and space required, and improving the energy density of the battery device. Furthermore, the rib can enhance the structural strength of the case cover, reducing the probability of bulging or abnormal noise from the case cover. While maintaining the same strength, the thickness of the case cover can be reduced, further improving the energy density of the battery device. Because the case cover is provided 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 case cover being torn and failing due to the expansion of the battery cell.

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

[0008] In the above technical solution, by making the two ends of the convex rib flush with or exceeding the two ends of the battery cell assembly, the convex rib can completely cover the multiple battery cells of the battery cell assembly in the first direction. As a result, the convex rib can offset the expansion force generated by any battery cell and limit the expansion amount of any 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 the plurality of 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 of the rib and the battery cell assembly be further improved, but also the force applied to multiple battery cells can be made more uniform, thereby reducing the probability of relative displacement of the battery cells due to vibration or impact of the battery device, reducing the risk of breakage of the battery cell pole, and improving the structural strength and reliability of the battery device.

[0011] In some embodiments, the rib is bonded to the battery cell assembly by structural adhesive.

[0012] In the above technical solution, the use of structural adhesive to bond the ribs to the battery cell assembly not only simplifies the connection structure between the ribs and the battery cell assembly, improving assembly efficiency, but also enhances the connection strength between the battery cell assembly and the ribs. This ensures that the cover, through the ribs, resists expansion of the battery cell assembly, further reducing the likelihood of bulging or noise from the cover, and also improves the structural strength and sealing performance between the cover and the battery cell assembly. Furthermore, because the ribs on the cover are directly bonded to the battery cell assembly via structural adhesive, the insulating film and / or buffer structure (foam) between the cover and the battery cell assembly can be eliminated. This further reduces the number of components within the battery assembly, improves space utilization within the battery assembly, reduces costs, and improves assembly efficiency.

[0013] In some embodiments, there are multiple ribs, 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 of the battery cell assembly be further improved, but the structural strength of the box cover can also be further enhanced, the probability of bulging and abnormal noise of the box cover can be reduced, and the reliability of the battery device can be further improved.

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

[0016] In the above technical solution, by directly fixing the cell shoulder on at least one side of the battery cell shell 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 of the battery cell can be improved, the deformation and displacement of the battery cell can be reduced, and the probability of interference between the first rib and the pole and conductive sheet of the battery cell can be reduced, resulting in a compact structure and improved space utilization within the battery device.

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

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

[0019] In some embodiments, the battery cell assembly further includes: a conductive sheet connected to the pole of the battery cell, a portion of the plurality of 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 into 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 rib defines a groove on a side away from the accommodating cavity, and the box body further includes: a reinforcement member extending along the first direction and fixed in the groove.

[0024] In the above technical solution, by arranging a reinforcement in the groove defined by the rib, the reinforcement can significantly improve the structural strength of the 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 impact, reduce the probability of the box cover bending, deformation, breakage and abnormal noise, 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. 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 toward the accommodating cavity and has a gap between it 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, there are multiple deformation parts, and the multiple deformation parts are arranged at intervals along the first direction.

[0030] In the above technical solution, by providing multiple deformation parts, the deformability of the box 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 box cover being torn and failing can be further reduced.

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

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

[0033] In some embodiments, the periphery of the box cover is bonded to the box body via an adhesive layer, and the adhesive layer is a structural adhesive layer and extends in a ring shape along the circumference of the box cover.

[0034] In the above technical solution, the periphery of the box cover is bonded to the box body via a structural adhesive layer. This not only improves the connection strength between the box cover and the box body, but also enhances the sealing performance at the connection point between the box body and the box cover, thereby improving the overall sealing performance of the box body. Furthermore, it reduces the number of parts in the battery device, improving assembly efficiency.

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

[0036] In the above technical solution, multiple battery cell assemblies are arranged between two expansion beams, and the expansion beams can limit the expansion of the battery cell assemblies in the first direction, reduce the deformation and displacement of the battery cells, and improve the stability of the battery device.

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

[0038] In the above embodiment, by setting up the battery device of the first aspect, since the box cover of the battery device is provided with a rib extending along the first direction, the rib is fixedly connected to the battery cell assembly, and the rib can play the role of a pressure strip, which is 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. Therefore, there is no need to set a pressure strip structure in the battery cell assembly, so as to reduce the number of components of the battery device, reduce the space occupied in the battery device, and improve the energy density of the battery device; and the rib can enhance the structural strength of the box cover, reduce the probability of bulging and abnormal noise of the box cover, and can also reduce the thickness of the box cover at the same strength, further improving the energy density of the battery device. Since a deformation portion that can be deformed along the first direction is formed on the box cover, when the battery cell expands, the deformation portion can absorb the expansion force of the battery cell through deformation, thereby reducing the risk of the box cover being torn and failing when the battery cell expands, thereby improving the overall performance of the electrical device.

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

[0040] In the above embodiment, by setting up the battery device of the first aspect, since the box cover of the battery device is provided with a rib extending along the first direction, the rib is fixedly connected to the battery cell assembly, and the rib can play the role of a pressure strip, which is 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. Therefore, there is no need to set a pressure strip structure in the battery cell assembly, so as to reduce the number of components of the battery device, reduce the space occupied in the battery device, and improve the energy density of the battery device; and the rib can enhance the structural strength of the box cover, reduce the probability of bulging and abnormal noise of the box cover, and can also reduce the thickness of the box cover at the same strength, further improving the energy density of the battery device. Since a deformation portion that can be deformed along the first direction is formed on the box cover, when the battery cell expands, the deformation portion can absorb the expansion force of the battery cell through deformation, thereby reducing the risk of the box cover being torn and failing when the battery cell expands, thereby improving the overall performance of the energy storage device.

[0041] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a schematic diagram of a vehicle according to an embodiment of the present application;

[0043] Figure 2 is an exploded view of a battery device according to an embodiment of the present application;

[0044] Figure 3 is a schematic structural diagram of a battery device according to an embodiment of the present application;

[0045] Figure 4 It is along Figure 3 Cross-sectional view along line AA;

[0046] Figure 5 yes Figure 4 An enlarged view of point B circled in the middle;

[0047] Figure 6 yes Figure 4 An enlarged view of the circled point C;

[0048] Figure 7 is a schematic structural diagram of a box cover and a reinforcement member of a battery device according to an embodiment of the present application;

[0049] Figure 8 2 is a schematic structural diagram of a battery device according to an embodiment of the present application without a box cover.

[0050] Reference numerals:

[0051] 1. Electrical devices;

[0052] 1000, battery device; 2000, controller; 3000, motor;

[0053] 100, box body; 101, accommodating chamber;

[0054] 110, box body; 120, box cover; 130, reinforcement; 140, expansion beam;

[0055] 1201, body; 1202, connecting edge;

[0056] 121, convex rib; 1211, first convex rib; 1212, second convex rib; 1213, groove; 1214, deformation portion;

[0057] 200, battery cell assembly; 210, battery cell; 220, conductive sheet; 211, terminal;

[0058] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0059] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art 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-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0061] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0062] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0063] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0064] In the description of the embodiments of the present application, the term "plurality" refers to more than two (including two).

[0065] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present 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 and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0066] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0067] In recent years, new energy vehicles have experienced rapid development. In this field, batteries, as the power source of electric vehicles, play an irreplaceable and important role. As core components of new energy vehicles, batteries have high requirements in terms of both energy density and reliability.

[0068] In related art, a battery device housing typically houses multiple battery modules. These modules have numerous components, making assembly complex and occupying considerable space within the housing, impacting the energy density and overall performance of the battery device. Furthermore, the housing, which includes a main body and a cover that seals the main body, needs further improvement in both structural strength and performance, as the cover protects the components within.

[0069] Based on the above considerations, in order to improve the energy density of the battery device and improve the overall performance of the box cover, the present application designs a battery device, and the box cover of the battery device is provided with a convex rib protruding toward the accommodating cavity, the convex rib extends along a first direction, and the battery cell assembly includes a plurality of battery cells stacked along the first direction, and the convex rib is fixedly connected to the battery cell assembly. In this way, the convex rib can play the role of a pressure strip in the battery cell assembly, which is 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. Therefore, there is no need to set a pressure strip structure in the battery cell assembly, so as to reduce the number of components, reduce space occupancy, and improve the energy density of the battery device; and the convex rib can enhance the structural strength of the box cover, reduce the probability of bulging and abnormal noise of the box cover, and can also reduce the thickness of the box cover at the same strength, thereby further improving the energy density of the battery device.

[0070] The present application provides an electrical device that uses the battery device of the present disclosure as a power source. The electrical device may include, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, and the like. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy.

[0071] For the convenience of description, the following embodiments take the electric device 1 as a vehicle as an example to introduce the structures of the electric device 1 , the battery device 1000 and the battery cell 210 of the present application in detail.

[0072] Please refer to Figure 1 , Figure 1 The power-consuming device 1 provided for some embodiments of the present application is a structural diagram of a vehicle. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and 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 to power the vehicle, for example, the battery device 1000 can be used as an operating power source for the vehicle. The vehicle may also include a controller 2000 and a motor 3000, and the controller 2000 is used to control the battery device 1000 to power the motor 3000, for example, for the starting, navigation and working power requirements of the vehicle during driving. In some embodiments of the present application, the battery device 1000 can not only serve as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0073] Reference below Figure 2-Figure 8 A battery device 1000 according to an embodiment of the first aspect of the present application is described. Figure 2 This is an 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 a battery device 1000 according to an embodiment of the present application; Figure 4 It is along Figure 3 Cross-sectional view along line AA; Figure 5 yes Figure 4 An enlarged view of point B circled in the middle; Figure 6 yes Figure 4 An enlarged view of the circled point C; Figure 7 1 is a schematic structural diagram of the box cover 120 and the reinforcement 130 of the battery device 1000 according to an embodiment of the present application; Figure 8 FIG. 1 is a schematic structural diagram of a battery device 1000 according to an embodiment of the present application without the box cover 120 .

[0074] Please refer to Figure 2 The battery device 1000 includes a housing 100 and a battery cell assembly 200 . In some embodiments, the battery device 1000 may be a battery pack, which includes the housing 100 and one or more battery cell assemblies 200 , wherein the battery cell assembly 200 is housed in the housing 100 .

[0075] The box body 100 may include a first box body and a second box body. The first box body and the second box body are buckled together to form a closed space inside the box body 100 to accommodate the battery cell assembly 200. The closed here means covered or closed, which can be sealed or unsealed. The first box body may be a top cover or a bottom plate. The box body 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 to form a closed space inside the box body 100 to accommodate the battery cell assembly 200. The box body 100 can also serve as part of the chassis structure of the vehicle. For example, the top cover of the box body 100 can become at least a part of the floor of the vehicle, or the frame of the box body 100 can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0076] 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 series through a busbar.

[0077] In some embodiments, the battery cell assembly 200 is typically formed by arranging multiple battery cells 210. For example, the battery cell assembly 200 may be a battery module, which is formed by arranging and securing multiple battery cells 210 to form a single module. For example, the battery module may be formed by bundling multiple battery cells 210 using cable ties.

[0078] As an example, the battery cell assembly 200 may be a battery module, which may be housed in the housing 100 by fixing the battery module in the housing 100. As an example, the battery cell assembly 200 may also be housed in the housing 100 by directly fixing a plurality of battery cells 210 to the housing 100.

[0079] 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, or magnesium-ion batteries, etc., and the embodiments of the present application do not limit this. The battery cells 210 may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of the present application do not limit this. The battery cells 210 are generally 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 do not limit this.

[0080] For example, a battery cell 210 may generally include a housing, a cell assembly, and an electrolyte. The housing is used to house the cell assembly and the electrolyte, and is provided with at least one positive electrode post and at least one negative electrode post. The cell assembly includes one or more electrode assemblies, which are formed by stacking or winding positive and negative electrode sheets and a separator.

[0081] The embodiment of the present application proposes a battery device 1000, such as Figure 2-Figure 6 As shown, it includes: a box body 100 and multiple 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 accommodating cavity 101, the box cover 120 is provided with a convex rib 121 protruding toward the accommodating cavity 101, the convex rib 121 extends along a first direction X, a portion 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; multiple battery cell assemblies 200 are arranged in the accommodating cavity 101 and arranged along a second direction Y, the second direction Y intersecting with the first direction X, each battery cell assembly 200 includes multiple battery cells 210 stacked along the first direction X, and the convex rib 121 is fixedly connected to the battery cell assembly 200.

[0082] 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 the first direction X and are arranged at intervals in the 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 the third direction Z. The bottom plate is sealed at the bottom of the frame beam.

[0083] In some examples, the box body 100 may further include a bottom guard plate connected to the box body 110 and located on a side of the bottom plate facing away from the frame beam.

[0084] 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 can be connected by fasteners, snap connections, adhesive connections, and / or fixedly connected by magnetic elements.

[0085] like Figure 2 As shown, the third direction Z is the vertical direction of the battery device 1000. The box cover 120 is located on the upper side of the box body 110. The lower surface of the box cover 120 is provided with a rib 121. The rib 121 can be integrally formed with the box cover 120, or it can be a separate component and fixed to the box cover 120 by welding, bonding, or other methods. The rib 121 is an elongated strip extending along the first direction X. For example, the rib 121 can extend from one end of the box cover 120 to the other end in the first direction X. Furthermore, the number of ribs 121 can be one or multiple ribs arranged at intervals. When there are multiple ribs 121, the multiple ribs 121 can be arranged sequentially along the second direction Y. For example, the number of ribs 121 can be two, three, four, five, six, seven, eight, ten, or more.

[0086] 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 a thickness direction (e.g. Figure 2 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 a stacked manner along the length direction of the battery cell 210 (e.g. Figure 2 In this embodiment, the battery cell assembly 200 is a battery module.

[0087] The ribs 121 are fixedly connected to the battery cell assembly 200, that is, the box cover 120 is fixedly connected to the battery cell assembly 200 via the ribs 121. For example, the ribs 121 are fixedly connected to the battery cell assembly 200 by bonding or other means.

[0088] In this embodiment, since the rib 121 extends along the stacking direction of the multiple battery cells 210 in the battery cell assembly 200 and is fixedly connected to the battery cell assembly 200, when the battery cell 210 in the battery cell assembly 200 expands, the rib 121 and the box cover 120 can limit and offset the expansion force of the battery cell assembly 200 along the first direction X, that is, they can play the role of a pressure strip in the battery module, thereby replacing the pressure strip in the battery module. In this way, the pressure strip structure of the battery cell assembly 200 can be eliminated, thereby not only reducing the number of components in the battery cell assembly 200, improving assembly efficiency and reducing costs, but also reducing space occupancy, improving space utilization within the battery device 1000, and making the structure compact, thereby improving the energy density of the battery device 1000.

[0089] At the same time, the ribs 121 formed on the box cover 120 can enhance the structural strength of the box cover 120, improve the box cover 120's deformation resistance and fatigue resistance, and enhance the protection of the components within the box body 100. Furthermore, by providing the ribs 121, the thickness of the box cover 120 can be reduced while maintaining the same structural strength, thereby reducing the cost of the box cover 120, further reducing the weight of the battery device 1000, and improving the energy density of the battery device 1000.

[0090] In addition, since the box cover 120 is fixedly connected to the battery cell assembly 200 via the ribs 121 , the structural strength of the box cover 120 can be further enhanced, the probability of the box cover 120 bulging and making abnormal noises is reduced, and the overall performance of the battery device 1000 is improved.

[0091] The deformation portion 1214 may be elastically deformed or non-elastically deformed along the first direction X.

[0092] In some examples, the number of the deformation portion 1214 can be one or more, wherein the number of the deformation portion 1214 can be reasonably set according to the design requirements of the box cover 120.

[0093] In some examples, the deformation portion 1214 may be made of a deformable elastic material, and the deformation portion 1214 may also be configured as a corrugated structure or a bent structure bent along the third direction Z.

[0094] In the above technical solution, since the deformation portion 1214 that can be deformed along the first direction X is formed on the box cover 120, when the battery cell 210 expands, the deformation portion 1214 can absorb the expansion force of the battery cell 210 by deformation, thereby reducing the risk of the box cover 120 being torn and failing when the battery cell 210 expands.

[0095] In the above technical solution, because the cover 120 is provided with a rib 121 extending along the first direction X and fixedly connected to the battery cell assembly 200, the rib 121 can function as a pressure bar within the battery cell assembly 200, offsetting the expansion force generated by the battery cell 210 when it expands, thereby limiting the amount of expansion of the battery cell assembly 200 in the first direction X. This eliminates the need for a pressure bar structure within the battery cell assembly 200, reducing the number of components and space required, and improving the energy density of the battery device 1000. Furthermore, the rib 121 can enhance the structural strength of the cover 120, reducing the likelihood of bulging or noise from the cover 120. While maintaining the same strength, the thickness of the cover 120 can also be reduced, further improving the energy density of the battery device 1000. When the battery cell 210 expands, the deformable portion 1214 can absorb the expansion force of the battery cell 210 through deformation, thereby reducing the risk of the cover 120 being torn and failing due to the expansion of the battery cell 210.

[0096] In some embodiments of the present application, Figure 2 and Figure 3 As shown, in the first direction X, two ends of the 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 .

[0097] For example Figure 2As shown, the first direction X is the front-to-back direction of the battery device 1000, and the rib 121 extends along the front-to-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.

[0098] In the above technical solution, by making the two ends of the convex rib 121 flush with or exceeding the two ends of the battery cell assembly 200, the convex rib 121 can completely cover the multiple battery cells 210 of the battery cell assembly 200 in the first direction X. As a result, the convex rib 121 can offset the expansion force generated by any battery cell 210 and limit the expansion amount of any battery cell 210, thereby reducing the displacement of the battery cell 210 and reducing the probability of local stress concentration.

[0099] In some embodiments of the present application, Figure 2 and Figure 4 As shown, the rib 121 is fixedly connected to the plurality of battery cells 210 in the battery cell assembly 200 .

[0100] For example, the rib 121 is adhesively connected to each battery cell 210 .

[0101] 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 of the rib 121 and the battery cell assembly 200 be further improved, but the force applied to the multiple battery cells 210 can also be made more uniform, thereby reducing the probability of relative displacement of the battery cells 210 due to vibration or impact of the battery device 1000, reducing the risk of breakage of the terminal 211 of the battery cell 210, and improving the structural strength and reliability of the battery device 1000.

[0102] In some embodiments of the present application, Figure 4-Figure 6 As shown, the rib 121 is bonded to the battery cell assembly 200 by means of structural adhesive.

[0103] In the above technical solution, the use of structural adhesive to bond the ribs 121 to the battery cell assemblies 200 not only simplifies the connection structure between the ribs 121 and the battery cell assemblies 200, improving assembly efficiency, but also enhances the connection strength between the battery cell assemblies 200 and the ribs 121. This ensures that the cover 120, through the ribs 121, prevents the battery cell assemblies 200 from expanding, further reducing the likelihood of bulging and abnormal noise from the cover 120. Furthermore, the structural strength and sealing performance between the cover 120 and the battery cell assemblies 200 are enhanced. Furthermore, because the ribs 121 on the cover 120 are directly bonded to the battery cell assemblies 200 via the structural adhesive, the insulating film and / or buffer structure (foam) between the cover 120 and the battery cell assemblies 200 can be eliminated. This further reduces the number of components within the battery assembly 1000, improves space utilization within the battery assembly 1000, reduces costs, and improves assembly efficiency.

[0104] In some embodiments of the present application, Figure 2 and Figure 3 As shown, there are multiple ribs 121 , and the multiple ribs 121 are arranged along the second direction Y.

[0105] For example, the number of ribs 121 can be two, three, four, five, six, seven, eight, ten or more. In some examples, the plurality of ribs 121 can be arranged at intervals in the second direction Y, or at least two ribs 121 can be arranged in a continuous manner in the second direction Y.

[0106] In some examples, the multiple ribs 121 may correspond one-to-one with multiple battery cell assemblies 200. In other examples, each battery cell assembly 200 may be connected to one or more ribs 121. When a battery cell assembly 200 is connected to multiple ribs 121, the anti-expansion effect of the battery cell assembly 200 can be improved. In some examples, a rib 121 may be fixedly connected to only one battery cell assembly 200, or a rib 121 may be fixedly connected to two adjacent battery cell assemblies 200.

[0107] In the above technical solution, by providing multiple ribs 121, not only can the anti-expansion effect of the battery cell assembly 200 be further improved, but the structural strength of the box cover 120 can also be further enhanced, the probability of bulging and abnormal noise of the box cover 120 can be reduced, and the reliability of the battery device 1000 can be further improved.

[0108] In some embodiments of the present application, Figure 2 、 Figure 5 and Figure 7As shown, a portion of the plurality of ribs 121 is formed as a first rib 1211 , and a cell shoulder on at least one side of the housing of the battery cell 210 in the second direction Y is fixedly connected to the first rib 1211 .

[0109] 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 structural adhesive.

[0110] The “cell shoulder” refers to the area on the side 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 .

[0111] 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. The two poles 211 are spaced apart along the second direction Y, and an explosion-proof valve is provided between the two poles 211. Specifically, on the side of the battery cell 210 housing facing the box cover 120, the area on the side of the two poles 211 facing away from the explosion-proof valve in the longitudinal direction of the battery cell 210 is the cell shoulder of the battery cell 210 housing. The first rib 1211 is fixedly connected to the cell shoulder of the battery cell 210 housing. For example, the first rib 1211 is bonded to the cell shoulder of the battery cell 210 housing using structural adhesive.

[0112] The first rib 1211 and the terminal 211 are spaced apart in the lengthwise direction of the battery cell 210. Furthermore, when the conductive sheet 220 is connected to the terminal 211, the first rib 1211 and the conductive sheet 220 are spaced apart in the lengthwise direction of the battery cell 210. This reduces the probability of interference between the first rib 1211, the terminal 211, and the conductive sheet 220, making the structural arrangement more compact and reasonable.

[0113] In some examples, the number of the first ribs 1211 can be two, three, four, five, six, seven, eight, ten, or more. In some examples, multiple battery cell assemblies 200 can be provided with multiple first ribs 1211 in a one-to-one correspondence, or each battery cell assembly 200 can be provided with two first ribs 1211, and the two first ribs 1211 are respectively provided at the battery cell shoulders at both ends of the corresponding battery cell assembly 200 in the second direction Y.

[0114] In the above technical solution, by directly fixing the cell shoulder on at least one side of the shell of the battery cell 210 in the second direction Y to the first rib 1211, the connection and fixing effect between the first rib 1211 and the battery cell 210 can be improved, the anti-expansion effect of the battery cell 210 can be improved, the deformation and displacement 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 be reduced, resulting in a compact structure and improved space utilization within the battery device 1000.

[0115] In some embodiments of the present application, Figure 4 As shown, the first rib 1211 is disposed between two adjacent battery cell assemblies 200 and is fixedly connected to the two adjacent battery cell assemblies 200 .

[0116] For example, in the second direction Y, one first rib 1211 may cover the cell shoulders of the casings of two adjacent battery cells 210 and be fixedly connected to the cell shoulders of the casings of the two adjacent battery cells 210. In other embodiments, two first ribs 1211 may be provided between two adjacent battery cell assemblies 200, and the two first ribs 1211 are connected to the cell shoulders of the casings of the battery cells 210 of the two battery cell assemblies 200 in a one-to-one correspondence.

[0117] In the above technical solution, by providing a first rib 1211 on two battery cell assemblies 200 and simultaneously connecting two adjacent battery cell assemblies 200, 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.

[0118] In some embodiments of the present application, Figure 6 and Figure 8 As shown, the battery cell assembly 200 further includes a conductive sheet 220 connected to the pole 211 of the battery cell 210 , a portion 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 .

[0119] In some examples, the conductive sheet 220 is a bar sheet. Multiple battery cells 210 in the battery cell assembly 200 are connected via the conductive sheet 220 to enable series or parallel connection between any two battery cells 210. The conductive sheet 220 is connected between the terminals 211 of two battery cells 210.

[0120] In some examples, the number of second ribs 1212 can be two, three, four, five, six, seven, eight, ten, or more. In some examples, multiple battery cell assemblies 200 can be provided with multiple second ribs 1212 in a one-to-one correspondence, or each battery cell assembly 200 can be provided with two or more second ribs 1212.

[0121] 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 bonded by a structural adhesive.

[0122] 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 the occurrence of abnormal noise.

[0123] In some embodiments of the present application, Figure 5-Figure 7 As shown, the rib 121 is formed by a portion of the box cover 120 being recessed toward the accommodating cavity 101 .

[0124] In some examples, both the first rib 1211 and the second rib 1212 are formed by recessing the cover 120 toward the interior of the accommodating cavity 101. In the recessed direction of the first rib 1211, the height of the first rib 1211 protruding toward the interior of the accommodating cavity 101 is greater than the height of the second rib 1212 protruding toward the interior of the accommodating cavity 101. Thus, the heights of the first rib 1211 and the second rib 1212 can be adapted to the cell shoulder and the conductive sheet 220 of the battery cell 210 housing, respectively, to facilitate connection between the first rib 1211 and the second rib 1212, respectively, and the cell shoulder and the conductive sheet 220 of the battery cell 210 housing.

[0125] In the above technical solution, by forming the rib 121 into a recessed shape from a portion of the box cover 120 toward 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, a 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.

[0126] In some embodiments of the present application, Figure 5 As shown, the rib 121 defines a groove 1213 on a side facing away from the accommodating cavity 101 . The box body 100 further includes a reinforcement member 130 . The reinforcement member 130 extends along the first direction X and is fixed in the groove 1213 .

[0127] For example, the reinforcement 130 can be in the shape of a long strip extending along the first direction X, wherein the width of the reinforcement 130 can be less than or equal to the width of the groove 1213, and the length of the reinforcement 130 can be less than or equal to the length of the groove 1213. In this way, the structural strength of the box cover 120 can be further improved to the maximum extent.

[0128] In some examples, a reinforcement member 130 is disposed in at least one groove 1213 , or a reinforcement member 130 is disposed in each groove 1213 , and multiple reinforcement members 130 correspond one-to-one to multiple grooves 1213 .

[0129] In some examples, the reinforcement member 130 and the box cover 120 can be connected by bonding, clamping, riveting, or welding. The reinforcement member 130 can also be fixed to the box cover 120 as a whole by injection molding.

[0130] In the above technical solution, by arranging a reinforcement 130 in the groove 1213 defined by the rib 121, the reinforcement 130 can significantly improve the structural strength of the rib 121, improve the structural strength of the box cover 120, improve the anti-expansion effect of the box cover 120 on the battery cell assembly 200, and also improve the ability of the box cover 120 to resist external impact, reduce the probability of the box cover 120 bending, deformation, breakage and abnormal noise, and improve the service life of the battery device 1000.

[0131] In some embodiments of the present application, Figure 5 and Figure 7 As shown, the reinforcement 130 is a steel member or a long fiber reinforced composite member.

[0132] For example, the reinforcement 130 may be a long fiber reinforced thermoplastic plastic part, a long fiber reinforced epoxy resin composite part, a long fiber reinforced phenolic resin composite part, or a long fiber reinforced vinyl ester resin composite part.

[0133] In the above technical solution, the reinforcement 130 is made of steel, which can significantly improve the strength and hardness of the reinforcement 130, enhance the deformation resistance of the box cover 120, and keep the structure of the box cover 120 stable. The reinforcement 130 is made of fiber-reinforced composite material, which can enhance the structural strength of the reinforcement 130 and reduce the weight of the reinforcement 130, thereby achieving lightweighting of the box cover 120 and improving the energy density of the battery device 1000.

[0134] In some embodiments of the present application, Figure 3 and Figure 7 As shown, the deformed portion 1214 is formed as a concave rib extending along the second direction Y and concave toward the accommodating cavity 101 . In the third direction Z, there is a gap between the concave rib and the battery cell assembly 200 . The third direction Z intersects both the first direction X and the second direction Y.

[0135] In some examples, the ends of the concave rib forming the deformation portion 1214 can extend to both side edge regions of the box cover 120 in the second direction Y. The concave rib forming the deformation portion 1214 can cross-connect with the first convex rib 1211 and the second convex rib 1212. By configuring the deformation portion 1214 as a concave rib that is recessed toward the accommodating cavity 101, on the one hand, the strength and rigidity of the box cover 120 in the second direction Y can be enhanced, thereby improving the box cover 120's ability to resist deformation in the second direction Y. On the other hand, it can facilitate the box cover 120 to elongate and deform along the first direction X at the location of the concave rib, thereby absorbing the expansion force of the battery cell 210 and reducing the risk of the box cover 120 being torn by the expansion force.

[0136] In some examples, the surface of the concave rib facing the battery cell assembly 200 does not contact the battery cell assembly 200, thereby reducing the risk of interference between the deformed portion 1214 and the battery cell assembly 200. In some examples, the height of the deformed portion 1214 protruding into the accommodating cavity 101 is less than or equal to the height of the second convex rib 1212 protruding into the accommodating cavity 101.

[0137] In the above technical solution, since the deformation portion 1214 is formed as a concave rib toward the accommodating cavity 101 and has a gap between it and the battery cell assembly 200, the structure of the deformation portion 1214 can be simplified, the processing and forming of the deformation portion 1214 can be facilitated, and the probability of interference between the deformation portion 1214 and the battery cell assembly 200 can be reduced, thereby improving the stability of the battery device 1000.

[0138] In some embodiments of the present application, Figure 3 and Figure 7 As shown, there are multiple deforming portions 1214 , and the multiple deforming portions 1214 are arranged along the first direction X at intervals.

[0139] For example, the number of the deformation parts 1214 can be two, three, four, five, six, seven, eight, ten or more.

[0140] In the above technical solution, by providing multiple deformation portions 1214 , the deformation of the box cover 120 in the first direction X can be increased, the effect of absorbing 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.

[0141] In some embodiments of the present application, the box cover 120 is a fiber-reinforced composite material, and the fibers in the box cover 120 extend along the first direction X; or, the box cover 120 is a plastic or metal part.

[0142] In some examples, the box cover 120 is made of a fiber-reinforced composite material. Fiber-reinforced composite materials are lightweight, have high strength and stiffness, and can improve the structural strength of the box cover 120, reduce its weight, and increase the energy density of the battery device 1000. Furthermore, the fibers within the box cover 120 extend along the first direction X, which facilitates the processing and forming of the first rib 1211 and the second rib 1212, reducing processing difficulty.

[0143] In some examples, the box cover 120 is a plastic part, which can reduce the weight of the box cover 120, reduce costs, and electrically insulate the box cover 120 from the battery cell assembly 200. In some examples, the box cover 120 is a metal part, which can improve the structural strength of the box cover 120.

[0144] In the above technical solution, since the box cover 120 is a fiber-reinforced composite material, plastic part or metal part, the structural strength of the box cover 120 can be improved and the cost of the box cover 120 can be reduced. The appropriate material of the box cover 120 can also be selected according to design requirements to improve the applicability of the box cover 120.

[0145] In some embodiments of the present application, Figure 2 and Figure 8 As shown, the periphery of the box cover 120 is bonded to the box body 110 via an adhesive layer. The adhesive layer is a structural adhesive layer and extends in a ring shape along the circumference of the box cover 120 .

[0146] In some examples, the box cover 120 includes a body 1201 and a connecting edge 1202. The connecting edge 1202 is connected to the periphery of the body 1201 and extends in a ring shape along the circumference of the body 1201. The connecting edge 1202 is spaced apart from the body 1201 in the thickness direction of the box cover 120, and the connecting edge 1202 is located on the side of the body 1201 facing the accommodating cavity 101. A first rib 1211 and a second rib 1212 are both formed on the body 1201. In a first direction X, both ends of the first rib 1211 and the second rib 1212 are flush with both ends of the body 1201. A deformed portion 1214 is formed on the body 1201. In a second direction Y, both ends of the deformed portion 1214 are flush with both side edges of the body 1201.

[0147] In some examples, the connection edge 1202 is bonded to the box body 110 via an adhesive layer. Furthermore, the adhesive layer can completely cover the surface of the connection edge 1202 facing the box body 110 to increase the connection area and enhance the connection strength and sealing performance between the box cover 120 and the box body 110.

[0148] In the above technical solution, the periphery of the box cover 120 is bonded to the box body 110 via a structural adhesive layer. This not only improves the connection strength between the box cover 120 and the box body 110, but also enhances the sealing performance at the connection between the box body 110 and the box cover 120, thereby improving the overall sealing performance of the box body 100. Furthermore, the number of components in the battery device 1000 can be reduced, thereby improving assembly efficiency.

[0149] In some embodiments of the present application, Figure 2 and Figure 8 As shown, the box body 100 further includes two expansion beams 140 , which extend along the second direction Y and are arranged at intervals in the first direction X. The plurality of battery cell assemblies 200 are disposed between the two expansion beams 140 .

[0150] In the above technical solution, multiple battery cell assemblies 200 are arranged between two expansion beams 140. The expansion beams 140 can limit the expansion of the battery cell assemblies 200 in the first direction X, reduce the deformation and displacement of the battery cells 210, and improve the stability of the battery device 1000.

[0151] In a second aspect, an embodiment of the present application further provides an electrical device 1 comprising the battery device 1000 according to any one of the above embodiments.

[0152] In the above technical solution, since the electrical device 1 is provided with the above-mentioned battery device 1000, and since the box cover 120 of the battery device 1000 is provided with a rib 121 extending along the first direction X, the rib 121 is fixedly connected to the battery cell assembly 200, and the rib 121 can act as a pressure strip, which is used to offset the expansion force generated by the battery cell 210 when the battery cell 210 expands, thereby limiting the expansion amount of the battery cell assembly 200 in the first direction X. Therefore, it is unnecessary to provide a pressure strip structure in the battery cell assembly 200, thereby reducing the number of components of the battery device 1000, reducing the space occupied in the battery device 1000, and improving the energy density of the battery device 1000; the rib 121 can also 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 electrical device 1.

[0153] In a third aspect, an embodiment of the present application further provides an energy storage device, comprising the battery device 1000 of any one of the above embodiments.

[0154] In some embodiments, the energy storage device includes a housing 100, with a door provided on at least one side of the housing 100. The energy storage device includes an energy storage container, an energy storage cabinet, and the like.

[0155] In the above technical solution, since the energy storage device is provided with the above-mentioned battery device 1000, and since the box cover 120 of the battery device 1000 is provided with a rib 121 extending along the first direction X, the rib 121 is fixedly connected to the battery cell assembly 200. The rib 121 can act as a pressure strip, which is used to offset the expansion force generated by the battery cell 210 when the battery cell 210 expands, thereby limiting the expansion amount of the battery cell assembly 200 in the first direction X. Therefore, it is unnecessary to provide a pressure strip structure in the battery cell assembly 200, thereby reducing the number of components of the battery device 1000, reducing the space occupied in the battery device 1000, and improving the energy density of the battery device 1000. In addition, 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 while maintaining the same strength, further improving the energy density of the battery device 1000, thereby improving the overall performance of the energy storage device.

[0156] The following will refer to Figures 1-8 A battery device 1000 according to a specific embodiment of the present application is described.

[0157] Reference Figure 2 The battery device 1000 includes a box 100 and a battery cell assembly 200 .

[0158] like Figure 2 As shown, the housing 100, serving as the primary load-bearing structure of the battery device 1000, is typically constructed of high-strength aluminum alloy or steel, offering excellent mechanical strength and lightweight properties. The housing 100 includes a housing 101 for securing and protecting the battery cell assembly 200. In some examples, the bottom of the housing 100 is provided with anti-collision beams or reinforcing ribs to enhance the overall rigidity of the housing 100 and protect the battery cells 210 within the housing 101 in extreme situations, such as vehicle collisions.

[0159] 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 accommodating cavity 101. The box body 110 is roughly in the shape of a rectangular box with an open top. Two expansion beams 140 are provided in the box 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 body 110.

[0160] Multiple battery cell assemblies 200 are positioned between the two expansion beams 140. The battery cell assemblies 200 can be battery modules and are the core functional units of the battery device 1000. They consist of multiple battery cells 210 and conductive sheets 220. The multiple battery cells 210 are connected in series and parallel via the conductive sheets 220 to achieve the required voltage and capacity of the battery device 1000. The conductive sheets 220 provide electrical connections between the battery cells 210 and are typically made of copper or aluminum. The multiple battery cells 210 in the battery cell assembly 200 are stacked sequentially along a first direction X. The multiple battery cell assemblies 200 are arranged sequentially along a second direction Y.

[0161] The box cover 120 includes a body 1201 and a connecting edge 1202. The connecting edge 1202 is connected to the periphery of the body 1201 and extends in a ring shape along the circumference of the body 1201. The connecting edge 1202 and the body 1201 are spaced apart in the thickness direction of the box cover 120, and the connecting edge 1202 is located on the side of the body 1201 facing the interior of the accommodating cavity 101. The connecting edge 1202 is bonded to the box body 110 using structural adhesive.

[0162] The body 1201 is formed with a plurality of first convex ribs 1211 recessed toward the interior of the accommodating cavity 101 and a plurality of concave ribs (deformation portions 1214). The convex ribs 121 extend along the first direction X and are spaced apart in the second direction Y. The convex ribs 121 include a first convex rib 1211 and a second convex rib 1212. In the first direction X, the ends of the first convex rib 1211 and the ends of the second convex rib 1212 are flush with the ends of the body 1201. The concave ribs (deformation portions 1214) extend along the second direction Y and are spaced apart in the first direction X. In the second direction Y, the ends of the concave ribs (deformation portions 1214) are flush with the side edges of the body 1201.

[0163] The first convex rib 1211 is bonded and fixed to the ends of the housings of the multiple battery cells 210 in the battery cell assembly 200 in the second direction Y (the shoulder areas of the battery cells 210) using structural adhesive. The second convex rib 1212 is bonded and fixed to the multiple conductive sheets 220 of the battery cell assembly 200 using structural adhesive. A gap is formed between the concave rib (deformation portion 1214) and the battery cell assembly 200.

[0164] Furthermore, the rib 121 is formed by being recessed into the accommodating cavity 101 by a portion of the box cover 120 , and the rib 121 defines a groove 1213 on the upper surface of the box cover 120 . A reinforcement member 130 extending along the first direction X can be provided in the groove 1213 to further enhance the structural strength of the box cover 120 .

[0165] In this embodiment, the periphery of the box cover 120 and the periphery of the box body 110 are bonded by structural adhesive to form a closed cavity structure, eliminating the use of bolt fasteners, reducing the number of parts, improving 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 by structural adhesive, and the bonding interface is "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", eliminating the use of insulating parts and foam between the box cover 120 and the battery cell assembly 200, reducing the number of parts and improving the space utilization within the battery device 1000.

[0166] In this embodiment, the battery cell assembly 200 lacks a separate load-bearing structure designed to resist the expansion force of the battery cells. Instead, the expansion force generated by the battery cells 210 in the battery cell assembly 200 is primarily absorbed by the two expansion beams 140 within the housing 100 and the first and second ribs 1211 and 1212 on the cover 120. This means that the cover 120 incorporates a load-bearing structure to resist the expansion force of the battery cells 210. Furthermore, the concave ribs extending along the second direction Y on the cover 120 absorb the tensile force generated by the expansion force of the battery cells 210 and transfer it to the cover 120 in the first direction X, thereby reducing the probability of cracking and failure of the cover 120 due to the tensile force in the first direction X. Furthermore, the cover 120 is bonded to the battery cell assembly 200 using structural adhesive, which mitigates issues such as poor contour and unusual noise within the cover 120.

[0167] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall 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), wherein the plurality of battery cell assemblies (200) are disposed 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 ribs (121) being fixedly connected to the battery cell assemblies (200), The number of the convex ribs (121) is multiple, and the multiple convex ribs (121) are arranged along the second direction (Y). 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).

2. The battery device according to claim 1, wherein: 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, wherein: The convex rib (121) is fixedly connected to the plurality of battery cells (210) in the battery cell assembly (200).

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

5. The battery device according to claim 1, wherein: 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).

6. The battery device according to claim 5, characterized in that The first rib (1211) is provided between two adjacent battery cell assemblies (200) and is fixedly connected to the two adjacent battery cell assemblies (200).

7. The battery device according to any one of claims 1 to 6, characterized in that: The convex rib (121) is formed by a portion of the box cover (120) being recessed toward the accommodating cavity (101).

8. The battery device according to claim 7, characterized in that 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).

9. The battery device according to claim 8, characterized in that The reinforcement member (130) is a steel member or a long fiber reinforced composite material member.

10. The battery device according to any one of claims 1 to 6, characterized in that: The deformed portion (1214) is formed as a concave rib extending along the second direction (Y) and recessed toward the accommodating cavity (101); in a third direction (Z), a gap exists 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).

11. The battery device according to any one of claims 1 to 6, characterized in that: There are multiple deformation parts (1214), and the multiple deformation parts (1214) are arranged at intervals along the first direction (X).

12. The battery device according to claim 1, wherein: 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.

13. The battery device according to claim 1, wherein: The periphery of the box cover (120) is bonded to the box body (110) via an adhesive layer, wherein the adhesive layer is a structural adhesive layer and extends in a ring shape along the circumference of the box cover (120).

14. The battery device according to claim 1, wherein: The box (100) further comprises: two expansion beams (140), the two expansion beams (140) extending along the second direction (Y) and arranged at intervals in the first direction (X), and the plurality of battery cell assemblies (200) are all arranged between the two expansion beams (140).

15. An electrical device, characterized in that: A battery device (1000) comprising any one of claims 1 to 14.

16. An energy storage device, characterized in that: A battery device (1000) comprising any one of claims 1 to 14.

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