Battery device and electric device

Abstract

The utility model discloses a battery device and a power utilization device, and the battery device comprises a box body which defines a containing cavity; the bottom protection plate is arranged at the bottom of the box body; the plurality of battery monomers are arranged in the accommodating cavity, and the pole columns of at least part of the battery monomers are arranged towards the bottom protection plate; and the protection part is arranged on the lower sides of the plurality of battery monomers, and in a horizontal projection plane, the projection of at least part of the pole arranged towards the bottom protection plate is located in the projection range of the protection part. According to the technical scheme, the protection part is arranged on the lower sides of the battery monomers, and in the horizontal projection plane, the projection of at least part of the pole arranged towards the bottom protection plate is located in the projection range of the protection part, so that the risk that the pole of the battery monomer is damaged can be effectively reduced, and the protection effect of the bottom protection plate on the battery monomer is enhanced; and the reliability of the battery device is effectively improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become a crucial component of this sector's sustainable development. Battery technology is a crucial factor in the development of electric vehicles. Battery safety is crucial, especially under common failure conditions like bottom ball impacts. Improving the bottom protection of battery packs has become a key issue currently requiring attention.

[0003] To improve the protection of the battery pack's bottom, a bottom guard plate is typically installed to reduce the risk of surface damage and electrolyte leakage from impact. However, when a battery cell is inverted, the cell's terminals face the bottom guard plate. As a structurally weak point in the battery pack, the terminals are susceptible to common failure conditions, such as ball strikes from the bottom, leading to terminal damage and reduced battery pack reliability. Utility Model Content

[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 and an electrical device incorporating the battery device, which effectively reduces the risk of damage to the battery cell terminals and enhances the protective effect of the bottom guard plate on the battery cells, thereby effectively improving the reliability of the battery device.

[0005] In the first aspect, an embodiment of the present application provides a battery device, which includes: a box body, which defines a accommodating cavity; a bottom guard plate, which is arranged at the bottom of the box body; a plurality of battery cells, which are arranged in the accommodating cavity, and at least some of the battery cells have their poles arranged toward the bottom guard plate; a protective member, which is arranged on the lower side of the plurality of battery cells, and in a horizontal projection plane, the projection of at least some of the poles arranged toward the bottom guard plate is within the projection range of the protective member.

[0006] In the above technical solution, by arranging the protective member on the lower side of multiple battery cells, and in the horizontal projection plane, the projection of at least part of the pole arranged toward the bottom guard plate is located within the projection range of the protective member, the risk of damage to the pole of the battery cell can be effectively reduced, and the protective effect of the bottom guard plate on the battery cell can be enhanced, thereby effectively improving the reliability of the battery device.

[0007] In some embodiments of the present application, a plurality of battery cells are stacked along a first direction to form a battery cell assembly, and the protective member extends along the first direction, which is a thickness direction of the battery cells.

[0008] In the above technical solution, multiple battery cells are stacked along a first direction to form a battery cell assembly, and the protective member extends along the first direction, which is the thickness direction of the battery cell. The protective member can protect multiple battery cells, thereby effectively improving the reliability of the protective member.

[0009] In some embodiments of the present application, there are multiple battery cell assemblies, which are arranged in sequence along the second direction, which is the length direction of the battery cell. There are multiple protective members, which are arranged at intervals in the second direction.

[0010] In the above technical solution, by arranging the plurality of protective members at intervals in the second direction, the material of the protective members can be effectively saved, thereby effectively reducing the weight of the battery device.

[0011] In some embodiments of the present application, the poles of multiple battery cells of the battery cell assembly constitute two pole groups spaced apart in a second direction, the second direction is the length direction of the battery cell, and in the horizontal projection plane, the projection of a protective member at least covers the projection of one pole group.

[0012] In the above technical solution, the poles of the multiple battery cells of the battery cell assembly are formed into two pole groups spaced apart in the second direction, where the second direction is the length direction of the battery cell. In the horizontal projection plane, the projection of a protective member at least covers the projection of one pole group, which can not only effectively improve the space utilization rate of the accommodating cavity of the box, but also effectively protect the pole group.

[0013] In some embodiments of the present application, there are multiple battery cell assemblies, and the multiple battery cell assemblies are arranged in sequence along a second direction, the second direction is the length direction of the battery cell, and the protective member is arranged between two adjacent battery cell assemblies. In the horizontal projection plane, in two adjacent battery cell assemblies, the projections of the two adjacent pole groups are both within the projection range of the same protective member.

[0014] In the above technical solution, by arranging the protective member between two adjacent battery cell assemblies, in the horizontal projection plane, in the two adjacent battery cell assemblies, the projections of the two adjacently arranged pole groups are both located within the projection range of the same protective member, which not only effectively saves the installation space required for the protective member, but also effectively reduces the number of protective members.

[0015] In some embodiments of the present application, the protective member includes: a reinforcing plate portion and two guard plate portions, the reinforcing plate portion extends along a first direction and is opposite to the gap between the two battery cell assemblies in the up and down directions, the two guard plate portions are respectively connected to both sides of the reinforcing plate portion in the second direction, and extend away from the reinforcing plate portion along the second direction, wherein the thickness of the reinforcing plate portion in the up and down directions is greater than the thickness of the guard plate portion in the up and down directions.

[0016] In the above technical solution, a reinforcing plate portion and two guard plate portions are provided in the protective member, the reinforcing plate portion extends along a first direction and is opposite to the gap between the two battery cell assemblies in the up and down directions, and the two guard plate portions are respectively connected to both sides of the reinforcing plate portion in the second direction and extend away from the reinforcing plate portion in the second direction, wherein the thickness of the reinforcing plate portion in the up and down directions is greater than the thickness of the guard plate portion in the up and down directions, which can take into account the structural strength and material usage of the protective member, thereby reducing the weight of the protective member while meeting the protection requirements.

[0017] In some embodiments of the present application, the lower side surface of the reinforcing plate portion is flush with the lower side surface of the guard plate portion.

[0018] In the above technical solution, by arranging the lower side surface of the reinforcing plate portion to be flush with the lower side surface of the guard plate portion, not only the protective effect of the protective member can be effectively enhanced, but also the compactness of the battery device can be effectively improved.

[0019] In some embodiments of the present application, a cavity is formed in the reinforcing plate portion, and the number of the cavity is one, or the number of the cavity is multiple, and the multiple cavities are arranged at intervals along the second direction.

[0020] In the above technical solution, by setting a cavity in the reinforcing plate portion, the number of the cavity is one, or the number of the cavities is multiple, and the multiple cavities are arranged at intervals along the second direction, the structural strength of the reinforcing plate portion can be effectively improved, and the material utilization rate can be effectively improved.

[0021] In some embodiments of the present application, the cavity extends along the first direction and passes through both end surfaces of the reinforcing plate portion in the first direction.

[0022] In the above technical solution, by extending the cavity along the first direction and penetrating the two end faces of the reinforcing plate in the first direction, not only can the reliability of the reinforcing plate under stress be effectively improved, but also the heat dissipation of the battery cell can be facilitated, thereby effectively improving the heat dissipation performance.

[0023] In some embodiments of the present application, the protective element is a one-piece piece.

[0024] In the above technical solution, by providing the protective member as an integral member, the overall structural strength of the protective member can be effectively improved. In addition, the difficulty of processing and assembly can be effectively reduced, thereby effectively improving work efficiency.

[0025] In some embodiments of the present application, a protective member is provided between the bottom guard plate and the plurality of battery cells.

[0026] In the above technical solution, the protective member is arranged between the bottom guard plate and the plurality of battery cells, which can not only effectively protect the battery cells, but also facilitate the maintenance of the protective member, thereby effectively improving the maintenance efficiency of the protective member.

[0027] In some embodiments of the present application, a bonding area is provided on the side surface of the battery cell shell facing the bottom guard plate, the bonding area is provided on the shoulder of the battery cell, and the protective member is bonded to the bonding area of ​​the battery cell.

[0028] In the above technical solution, a bonding area is provided on the surface of the battery cell shell facing the bottom guard plate, and the bonding area is provided on the shoulder of the battery cell. The protective part is bonded to the bonding area of ​​the battery cell, which can effectively improve and simplify the connection method between the protective part and the battery cell.

[0029] In some embodiments of the present application, there are multiple battery cell assemblies, and the multiple battery cell assemblies are arranged in sequence along a second direction, the second direction is the length direction of the battery cell, and the protective member is arranged between two adjacent battery cell assemblies. The protective member includes: a reinforcing plate portion and two guard plate portions, the reinforcing plate portion extends along a first direction and is opposite to the gap between the two battery cell assemblies in the up and down directions, the first direction is the thickness direction of the battery cell, the two guard plate portions are respectively connected to both sides of the reinforcing plate portion in the second direction, and extend away from the reinforcing plate portion along the second direction, and the reinforcing plate portion is connected to the bonding area of ​​the two adjacent battery cell assemblies.

[0030] In the above technical solution, by setting the number of battery cell assemblies to multiple, the multiple battery cell assemblies are arranged in sequence along the second direction, and the protective member is arranged between two adjacent battery cell assemblies. The protective member includes: a reinforcing plate portion and two protective plate portions. The reinforcing plate portion extends along the first direction and is opposite to the gap between the two battery cell assemblies in the up and down directions. The first direction is the thickness direction of the battery cell. The two protective plate portions are respectively connected to the two sides of the reinforcing plate portion in the second direction and extend away from the reinforcing plate portion along the second direction. The reinforcing plate portion is connected to the bonding area of ​​the two adjacent battery cell assemblies. The layout and structure of the protective member can be optimized, thereby effectively improving the protective effect of the protective member on the battery device.

[0031] In some embodiments of the present application, the battery device further includes an electrical connection piece connected to the pole, and in the horizontal projection plane, the guard plate portion is disposed between the electrical connection piece and the bottom guard plate.

[0032] In the above technical solution, in the horizontal projection plane, the guard plate portion is arranged between the electrical connection piece and the bottom guard plate, which can effectively protect the electrical connection piece, thereby effectively improving the reliability of the electrical connection piece.

[0033] In some embodiments of the present application, the guard plate portion and the electrical connection piece are spaced apart in the up and down directions.

[0034] In the above technical solution, by arranging the guard plate portion and the electrical connection piece at intervals in the vertical direction, the guard plate portion has sufficient deformation space when deformed by external impact, thereby effectively absorbing the energy generated by the impact and effectively improving the protection effect.

[0035] In some embodiments of the present application, a cavity is formed in the reinforcing plate portion.

[0036] In the above technical solution, by providing a cavity in the reinforcing plate portion, not only the weight of the protective member can be effectively reduced, but also the material utilization rate of the protective member can be effectively improved.

[0037] In some embodiments of the present application, two limiting beams are provided in the box body and are arranged at intervals in a first direction. The two limiting beams extend along a second direction perpendicular to the first direction. A plurality of battery cells are arranged between the two limiting beams. Both end edges of the reinforcing plate portion in the first direction extend beyond both end edges of the guard plate portion. The portion of the reinforcing plate portion that extends beyond the guard plate portion is formed as an extended section, and the extended section is fixedly connected to the limiting beams.

[0038] In the above technical solution, two limiting beams are arranged at intervals in a first direction in the box body, and the two limiting beams extend along a second direction perpendicular to the first direction. A plurality of battery cells are arranged between the two limiting beams, and both end edges of the reinforcing plate portion in the first direction exceed both end edges of the guard plate portion. The portion of the reinforcing plate portion that exceeds the guard plate portion forms an extended section, and the extended section is fixedly connected to the limiting beams, which can effectively improve the rigidity and stability of the battery device.

[0039] In some embodiments of the present application, the protective member is an insulating member.

[0040] In the above technical solution, by setting the protective member as an insulating member, short circuits or other electrical faults caused by accidental contact can be effectively reduced, thereby effectively improving the reliability of the battery device.

[0041] In some embodiments of the present application, the protective member is a resin fiber composite material member.

[0042] In the above technical solution, by setting the protective part as a resin fiber composite material part, the specific strength and impact resistance of the protective part can be effectively improved, thereby effectively reducing the risk of damage to the battery cell due to external impact, and thus effectively protecting the battery cell.

[0043] In some embodiments of the present application, the flexural modulus of the protective element is greater than or equal to GPa.

[0044] In the above technical solution, setting the bending modulus of the protective member to be greater than or equal to GPa can not only effectively improve the protective effect of the protective member, but also effectively improve the durability of the protective member, thereby effectively extending the service life of the protective member.

[0045] In some embodiments of the present application, two limiting beams are provided in the box body and are arranged at intervals in a first direction. The two limiting beams extend along a second direction perpendicular to the first direction. A plurality of battery cells are arranged between the two limiting beams. The protective member extends along the first direction, and the two ends of the protective member in the first direction are fixedly connected to the two limiting beams.

[0046] In the above technical solution, by setting the protective member to extend along the first direction, and the two ends of the protective member in the first direction are fixedly connected to the two limiting beams, the protective member can effectively reduce the displacement of the limiting beam in the first direction, thereby effectively improving the rigidity and stability of the battery device.

[0047] In some embodiments of the present application, the protective member includes: a reinforcing plate portion and two guard plate portions, the reinforcing plate portion extends along a first direction, and the two guard plate portions are respectively connected to both sides of the reinforcing plate portion in a second direction, wherein both end edges of the reinforcing plate portion in the first direction exceed both end edges of the guard plate portion, and the portion of the reinforcing plate portion exceeding the guard plate portion forms an extended section, and the protective member is fixedly connected to the limiting beam through the extended section.

[0048] In the above technical solution, both end edges of the reinforcing plate portion in the first direction extend beyond both end edges of the guard plate portion, and the portion of the reinforcing plate portion extending beyond the guard plate portion is formed into an extended section. The protective member is fixedly connected to the limiting beam through the extended section, which can effectively strengthen the structural strength of the connection between the protective member and the limiting beam, thereby effectively improving the reliability of the connection between the protective member and the limiting beam.

[0049] In some embodiments of the present application, the protective member is adhesively connected to the bottom guard plate, or the protective member and the bottom guard plate are integrated into one piece.

[0050] In the above technical solution, by bonding the protective part to the bottom guard plate, the assembly efficiency of the protective part can be effectively improved and the structural structure can be effectively simplified; by integrating the protective part and the bottom guard plate into one piece, the structural strength of the protective part can be effectively improved and the assembly accuracy can be effectively improved.

[0051] In some embodiments of the present application, the protective member is integrated with the bottom guard plate into a single piece.

[0052] In the above technical solution, by integrating the protective member and the bottom guard plate into one piece, the number of parts in the battery device assembly process can be reduced, thereby simplifying the assembly process of the battery device and effectively improving the assembly efficiency of the battery device.

[0053] In some embodiments of the present application, the protective member is embedded in the bottom guard plate.

[0054] In the above technical solution, by embedding the protective member in the bottom guard plate, not only the stability of the protective member can be effectively improved, but also the space utilization rate inside the battery device can be effectively improved.

[0055] In some embodiments of the present application, the bottom guard plate includes a buffer layer and two composite material layers, the two composite material layers are respectively arranged on both sides of the buffer layer in the up and down directions, and the protective member is arranged between the composite material layer and the buffer layer.

[0056] In the above technical solution, a buffer layer and two composite material layers are arranged in the bottom guard plate. The two composite material layers are respectively arranged on both sides of the buffer layer in the up and down directions. The protective part is arranged between the composite material layer and the buffer layer, which can effectively improve the impact resistance and structural strength of the bottom guard plate, thereby effectively improving the reliability of the bottom guard plate.

[0057] In some embodiments of the present application, the bottom guard plate further includes a metal layer, which is arranged between the buffer layer and the composite material layer located on the lower side of the buffer layer.

[0058] In the above technical solution, by setting a metal layer in the bottom guard plate, the metal layer is arranged between the buffer layer and the composite material layer located on the lower side of the buffer layer, which not only can further improve the rigidity and structural strength of the bottom guard plate, but also can improve the heat dissipation performance of the battery device.

[0059] In some embodiments of the present application, the protective element is disposed on a side of the buffer layer facing the metal layer.

[0060] In the above technical solution, by arranging the protective part on the side of the buffer layer facing the metal layer, the protective part can be doubly protected by the buffer layer and the metal layer, effectively reducing the risk of damage or displacement of the protective part due to external impact, thereby further improving the reliability and stability of the protective part.

[0061] In some embodiments of the present application, the metal layer and the composite material layer located on the upper side of the metal layer cooperate to define a buffer cavity, and the buffer layer is filled in the buffer cavity.

[0062] In the above technical solution, the metal layer and the composite material layer located on the upper side of the metal layer are combined to define a buffer cavity, and the buffer layer is filled in the buffer cavity, which can not only effectively improve the buffering effect of the buffer layer, but also effectively save the installation space of the buffer layer, thereby effectively improving the compactness of the bottom guard plate.

[0063] In some embodiments of the present application, the number of the buffer cavity is one, or the number of the buffer cavity is multiple, and the multiple buffer cavities are arranged at intervals along the first direction.

[0064] In the above technical solution, the number of buffer cavities is set to one, or the number of buffer cavities is set to multiple, and multiple buffer cavities are arranged at intervals along the first direction, which can effectively meet the protection requirements of different types of battery devices, thereby effectively improving the flexibility of the bottom guard plate.

[0065] In some embodiments of the present application, the metal layer is a steel plate or an aluminum alloy plate; and / or the plate thickness of the metal layer is greater than or equal to 0.4 mm.

[0066] In the above technical solution, the metal layer is set to a steel plate or an aluminum alloy plate, and / or the plate thickness of the metal layer is set to be greater than or equal to 0.4 mm, so that the metal layer has reliable impact resistance, thereby effectively improving the protection performance of the bottom guard plate to the battery device.

[0067] In some embodiments of the present application, the tensile strength of the metal layer is greater than or equal to 500 MPa; and / or the yield strength of the metal layer is greater than or equal to 300 MPa; and / or the elongation at break of the metal layer is greater than or equal to 15%.

[0068] In the above technical solution, the tensile strength of the metal layer is set to be greater than or equal to 500 MPa, so that the metal layer can reliably resist external tensile force; the yield strength of the metal layer is set to be greater than or equal to 300 MPa, so that the metal layer can have sufficient elastic deformation ability; the elongation at break of the metal layer is set to be greater than or equal to 15%, so that the metal layer can have good ductility.

[0069] In some embodiments of the present application, the composite material layer is a resin fiber composite material layer.

[0070] In the above technical solution, by setting the composite material layer as a resin fiber composite material layer, not only the specific strength of the composite material layer can be effectively improved, but also the durability of the bottom guard plate can be effectively improved.

[0071] In some embodiments of the present application, the resin in the composite material layer is a thermosetting resin or a thermoplastic polyamide; and / or, the fiber in the composite material layer is glass fiber, carbon fiber, ultra-high molecular weight polyethylene fiber, aramid fiber or basalt fiber.

[0072] In the above technical solution, by setting the resin in the composite material layer to a thermosetting resin or a thermoplastic polyamide, the mechanical strength and durability of the composite material layer can be effectively improved; by setting the fibers in the composite material layer to glass fibers, carbon fibers, ultra-high molecular weight polyethylene fibers, aramid fibers or basalt fibers, the weight of the composite material layer can be effectively reduced while meeting the strength requirements, thereby effectively realizing the lightweight requirements of the bottom guard plate.

[0073] In some embodiments of the present application, the thickness of the composite material layer located on the upper side of the buffer layer is greater than or equal to 0.3 mm and less than or equal to 1.5 mm; and / or the thickness of the composite material layer located on the lower side of the buffer layer is greater than or equal to 0.6 mm and less than or equal to 2 mm.

[0074] In the above technical solution, the thickness of the composite material layer located on the upper side of the buffer layer is set to be greater than or equal to 0.3 mm and less than or equal to 1.5 mm, and / or the thickness of the composite material layer located on the lower side of the buffer layer is set to be greater than or equal to 0.6 mm and less than or equal to 2 mm. This not only enables the composite material layer to have sufficient structural strength, but also effectively controls the weight of the composite material layer, thereby taking into account the strength and weight requirements of the bottom guard plate.

[0075] In some embodiments of the present application, the buffer layer is a foam material layer or a metal honeycomb structure layer.

[0076] In the above technical solution, by setting the buffer layer as a foam material layer or a metal honeycomb structure layer, not only can the energy absorption effect of the buffer layer be effectively improved, thereby improving the protection effect on the battery device, but the weight of the buffer layer can also be effectively reduced, thereby meeting the lightweight design requirements.

[0077] In some embodiments of the present application, the thickness of the buffer layer is greater than or equal to 2 mm.

[0078] In the above technical solution, by setting the thickness of the buffer layer to be greater than or equal to 2 mm, the deformation requirement of the buffer layer can be effectively met, thereby effectively absorbing the energy generated by external impact and effectively protecting the battery device.

[0079] In a second aspect, an embodiment of the present application provides an electrical device, which includes a battery device according to the first aspect of the present application.

[0080] In the above technical solution, by arranging the battery device of the first aspect in the electrical device, the risk of damage to the pole of the battery cell can be effectively reduced, and the protective effect of the bottom guard plate on the battery cell can be enhanced, thereby effectively improving the reliability of the electrical device.

[0081] 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

[0082] Figure 1 is a structural schematic diagram of a vehicle according to an embodiment of the present application;

[0083] Figure 2 is a schematic structural diagram of a battery device according to some embodiments of the present application;

[0084] Figure 3 yes Figure 2 An enlarged view of point A circled in the middle;

[0085] Figure 4 is a cross-sectional view of a battery device according to some embodiments of the present application;

[0086] Figure 5 yes Figure 4 An enlarged view of point B circled in the middle;

[0087] Figure 6 is a schematic structural diagram of a protective plate according to some embodiments of the present application;

[0088] Figure 7 is a cross-sectional view of a protective plate according to some embodiments of the present application;

[0089] Figure 8 is a schematic structural diagram of a battery device according to other embodiments of the present application;

[0090] Figure 9 are cross-sectional views of battery devices according to other embodiments of the present application;

[0091] Figure 10 yes Figure 9 An enlarged view of the circled point C;

[0092] Figure 11 is the explosion of the bottom guard plate according to other embodiments of the present application;

[0093] Figure 12 is a schematic structural diagram of a bottom guard plate according to other embodiments of the present application;

[0094] Figure 13 is a cross-sectional view of a bottom guard plate according to other embodiments of the present application;

[0095] Figure 14 yes Figure 13 The enlarged view of the circled point D;

[0096] Figure 15 yes Figure 13Enlarged view of point E circled in the middle.

[0097] Reference numerals:

[0098] 1. Electrical devices;

[0099] 100. Battery device;

[0100] 10. Box body;

[0101] 20. Bottom guard plate; 201. Fixing hole;

[0102] 21. Buffer layer; 22. Composite material layer; 23. Metal layer; 231. Buffer cavity;

[0103] 30. Battery cells;

[0104] 31. Pole;

[0105] 40. Protective parts;

[0106] 41. Reinforcement plate; 411. Cavity; 412. Extension section; 42. Guard plate;

[0107] 50. Electrical connection piece;

[0108] 60. Limit beam;

[0109] 200, controller;

[0110] 300, motor;

[0111] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0112] 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.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] In the description of the embodiments of the present application, the term "plurality" refers to more than two (including two).

[0118] 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.

[0119] 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.

[0120] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include one or more battery cells. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or hybrid via a busbar.

[0121] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells. For example, the battery cell assembly may be a battery module, which is a battery module formed by arranging and securing multiple battery cells to form a single module. For example, a battery module may be formed by bundling multiple battery cells using cable ties.

[0122] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are housed in the case.

[0123] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0124] As an example, the battery cell assembly may also be housed in the box by directly fixing the plurality of battery cells to the box.

[0125] As an example, the housing may include a first housing and a second housing. The first housing and the second housing engage to form an enclosed space within the housing to house the battery cell assembly. Enclosed here means covered or closed, and can be either sealed or unsealed. The first housing may be a top cover or a bottom plate.

[0126] As an example, the box may include a top cover, a frame, and a bottom plate, wherein the top cover and the bottom plate are respectively connected to the frame to form a closed space inside the box to accommodate the battery cell assembly.

[0127] As an example, the box body can be used as a part of the chassis structure of the vehicle. For example, the top cover of the box body can become at least a part of the floor of the vehicle, or the frame of the box body can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0128] In some embodiments, the battery device refers to an energy storage device, which includes a box with a door on at least one side. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0129] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, electric tools and vehicles.

[0130] New energy vehicles have experienced rapid development in recent years. Within the electric vehicle sector, batteries, as the power source, play an irreplaceable and crucial role. Battery safety is crucial, particularly under common failure conditions like bottom impact. Improving the bottom protection of battery packs has become a key concern.

[0131] To improve the protection of the battery pack's bottom, battery devices in related technologies typically incorporate a bottom shield to reduce the risk of surface damage and electrolyte leakage from impact. However, when a battery cell is inverted, the terminal blocks face the bottom shield. As a structurally weak point in the battery pack, the terminals are susceptible to common failure conditions, such as ball strikes from the bottom, leading to terminal damage and reduced battery pack reliability.

[0132] Based on the above considerations, in order to improve the protective effect of the bottom guard plate on the battery cells when they are inverted, thereby improving the reliability of the battery device, the present application designs a battery device, which includes a box body, a bottom guard plate, a protective member and multiple battery cells. The box body defines a accommodating cavity, the bottom guard plate is arranged at the bottom of the box body, and multiple battery cells are arranged in the accommodating cavity, and at least part of the battery cells' poles are arranged toward the bottom guard plate, and the protective member is arranged on the lower side of the multiple battery cells. In the horizontal projection plane, the projection of at least part of the poles arranged toward the bottom guard plate is located within the projection range of the protective member. Therefore, when the bottom area corresponding to the poles of the battery pack is impacted, the bottom guard plate and the protective member can jointly absorb the energy generated by the impact, thereby effectively reducing the risk of damage to the poles of the battery cells, strengthening the protective effect of the bottom guard plate on the battery cells, and thus effectively improving the reliability of the battery device.

[0133] The present application provides an electrical device that uses the battery device disclosed herein 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, etc. The electric toy may include a fixed or mobile electric toy, such as a game console and an electric car toy.

[0134] 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 battery device 100 and the electric device 1 of the present application in detail.

[0135] Please refer to Figure 1 , Figure 1Schematic diagram of the structure of a vehicle according to an embodiment of the present application. 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 100, and the battery device 100 can be arranged at the bottom, head or tail of the vehicle. The battery device 100 can be used to power the vehicle, for example, the battery device 100 can be used as an operating power source for the vehicle. The vehicle may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and driving the vehicle. In some embodiments of the present application, the battery device 100 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.

[0136] Please refer to Figure 2 , Figure 2 is a schematic structural diagram of a battery device according to some embodiments of the present application; Figure 3 yes Figure 2 An enlarged view of point A circled in the middle; Figure 4 is a cross-sectional view of a battery device according to some embodiments of the present application; Figure 5 yes Figure 4 An enlarged view of point B circled in the middle; Figure 6 is a schematic structural diagram of a protective plate according to some embodiments of the present application; Figure 7 is a cross-sectional view of a protective plate according to some embodiments of the present application; Figure 8 is a schematic structural diagram of a battery device according to other embodiments of the present application; Figure 9 are cross-sectional views of battery devices according to other embodiments of the present application; Figure 10 yes Figure 9 An enlarged view of the circled point C; Figure 11 is the explosion of the bottom guard plate according to other embodiments of the present application; Figure 12 is a schematic structural diagram of a bottom guard plate according to other embodiments of the present application; Figure 13 is a cross-sectional view of a bottom guard plate according to other embodiments of the present application; Figure 14 yes Figure 13 The enlarged view of the circled point D; Figure 15 yes Figure 13 Enlarged view of point E circled in the middle.

[0137] Reference below Figure 2-Figure 15 A battery device 100 according to an embodiment of the first aspect of the present application is described.

[0138] The present application embodiment provides a battery device 100, such as Figure 3-Figure 15As shown, the battery device 100 includes a box body 10 , a bottom guard plate 20 , a protection member 40 and a plurality of battery cells 30 .

[0139] The box body 10 defines a accommodating cavity; the bottom guard plate 20 is arranged at the bottom of the box body 10; multiple battery cells 30 are arranged in the accommodating cavity, and at least part of the poles 31 of the battery cells 30 are arranged toward the bottom guard plate 20; the protective member 40 is arranged on the lower side of the multiple battery cells 30, and in the horizontal projection plane, the projection of at least part of the poles 31 arranged toward the bottom guard plate 20 is located within the projection range of the protective member 40.

[0140] For example, the number of battery cells 30 may be 20, 30, 40, 50, or more than 60. Figure 2 As shown, a receiving cavity is formed in the box body 10, and a plurality of battery cells 30 are arranged in the receiving cavity. Figure 4 As shown, the bottom guard plate 20 is disposed at the bottom of the box body 10 , thereby being able to protect the plurality of battery cells 30 in the accommodating cavity of the box body 10 .

[0141] For example, some of the battery cells 30 among the multiple battery cells 30 are inverted, that is, the poles 31 of some of the battery cells 30 among the multiple battery cells 30 are arranged toward the bottom guard plate 20; for another example, all of the battery cells 30 in the accommodating cavity are inverted, that is, the poles 31 of the multiple battery cells 30 are arranged toward the bottom guard plate 20.

[0142] In some specific examples, such as Figure 2 As shown, the poles 31 of the multiple battery cells 30 are all arranged toward the bottom guard plate 20, and the protective member 40 is arranged on the lower side of the multiple battery cells 30. In the horizontal projection plane, the projection of the pole 31 arranged toward the bottom guard plate 20 is located within the projection range of the protective member 40. That is to say, the protection range of the protective member 40 can cover the pole 31 of the battery cell 30, thereby effectively protecting the pole 31 of the battery cell 30 when the battery cell 30 is inverted.

[0143] It should be noted that in the prior art, a bottom guard plate 20 is typically installed at the bottom of the battery pack to reduce the risk of surface damage and electrolyte leakage from impacts. However, when the battery cell 30 is inverted, the terminal 31 of the battery cell 30 is positioned toward the bottom guard plate 20. As a structurally weak area of ​​the battery pack, the terminal 31 is susceptible to common failure conditions such as ball impacts from the bottom, which can lead to damage to the terminal 31 and reduce the reliability of the battery pack.

[0144] In the present application, the protective member 40 is arranged on the lower side of multiple battery cells 30, and in the horizontal projection plane, the projection of at least part of the pole 31 arranged toward the bottom guard plate 20 is located within the projection range of the protective member 40. Therefore, when the bottom area corresponding to the pole 31 of the inverted battery cell 30 in the battery device 100 is impacted, the bottom guard plate 20 can first absorb part of the energy generated by the impact, and the protective member 40 can further absorb the energy generated by the impact. That is to say, the bottom guard plate 20 and the protective member 40 work together to effectively reduce the risk of damage to the pole 31 of the battery cell 30.

[0145] Furthermore, because the protective member 40 inherently possesses a certain degree of rigidity and structural strength, it effectively supports the bottom guard plate 20, thereby enhancing the rigidity and structural strength of the bottom guard plate 20. When a bottom impact load acts on the bottom guard plate 20, the protective member 40 effectively disperses the energy generated by the impact, thereby reducing the deformation of the bottom guard plate 20. This effectively minimizes damage to the battery cells 30 caused by deformation of the bottom guard plate 20, thereby enhancing the protective effect of the bottom guard plate 20 on the battery cells 30.

[0146] In the above technical solution, by arranging the protective member 40 on the lower side of multiple battery cells 30, and in the horizontal projection plane, the projection of at least part of the pole 31 arranged toward the bottom guard plate 20 is located within the projection range of the protective member 40, the risk of damage to the pole 31 of the battery cell 30 can be effectively reduced, and the protective effect of the bottom guard plate 20 on the battery cell 30 can be enhanced, thereby effectively improving the reliability of the battery device 100.

[0147] In some embodiments of the present application, Figure 2 As shown, a plurality of battery cells 30 are stacked along a first direction X to form a battery cell assembly. The protective member 40 extends along the first direction X, which is a thickness direction of the battery cells 30 .

[0148] It should be noted that in some specific examples, such as Figure 1 As shown, the first direction X is the length direction of the battery device 100, that is, the thickness direction of the battery cells 30 is parallel to the length direction of the battery device 100. For example, the number of battery cells 30 can be ten, fifteen, twenty, twenty-five, or more than thirty. The multiple battery cells 30 are stacked along the first direction X, and the protective member 40 extends along the thickness direction of the battery cells 30.

[0149] In the above technical solution, multiple battery cells 30 are stacked along a first direction X to form a battery cell assembly. The protective member 40 extends along the first direction X, which is the thickness direction of the battery cell 30. The protective member 40 can protect the multiple battery cells 30, thereby effectively improving the reliability of the protective member 40.

[0150] In some embodiments of the present application, Figure 2 and Figure 8 As shown, there are multiple battery cell assemblies, which are arranged in sequence along the second direction Y. The second direction Y is the length direction of the battery cell 30. There are multiple protective members 40, which are arranged at intervals in the second direction Y.

[0151] It should be noted that the second direction Y is the width direction of the battery device 100 , and the first direction X and the second direction Y are perpendicular to each other. That is, the length direction of the battery cell 30 is parallel to the width direction of the battery device 100 .

[0152] For example, the number of battery cell assemblies may be two, three, four, five, or more than six. Figure 2 and Figure 8 As shown, multiple battery cell assemblies are sequentially arranged along the length direction of the battery cell 30. For example, the number of the protective members 40 can be three, four, five, six or more than seven, and the multiple protective members 40 are arranged at intervals along the length direction of the battery cell 30.

[0153] In the above technical solution, by arranging the plurality of protection members 40 at intervals in the second direction Y, the material of the protection members 40 can be effectively saved, thereby effectively reducing the weight of the battery device 100 .

[0154] In some embodiments of the present application, the poles 31 of the multiple battery cells 30 of the battery cell assembly constitute two pole groups arranged at intervals in the second direction Y, the second direction Y is the length direction of the battery cell 30, and in the horizontal projection plane, the projection of a protective member 40 covers at least the projection of one pole group.

[0155] In some specific examples, such as Figure 2 and Figure 8 As shown, each battery cell assembly is provided with two terminal groups spaced apart in the second direction Y. For example, the projection of one protective member 40 can cover the projection of one terminal group; in another example, the projection of one protective member 40 can cover the projections of multiple terminal groups. In other words, the size of a single protective member 40 is large enough so that its projection in a horizontal projection plane can cover the projection of at least one terminal group.

[0156] In the above technical solution, the poles 31 of the multiple battery cells 30 of the battery cell assembly are formed into two pole groups arranged at intervals in the second direction Y. The second direction Y is the length direction of the battery cell 30. In the horizontal projection plane, the projection of a protective member 40 at least covers the projection of one pole group, which can not only effectively improve the space utilization rate of the accommodating cavity of the box body 10, but also effectively protect the pole group.

[0157] In some embodiments of the present application, Figure 2 As shown, there are multiple battery cell assemblies, and the multiple battery cell assemblies are arranged in sequence along the second direction Y, the second direction Y is the length direction of the battery cell 30, and the protective member 40 is arranged between two adjacent battery cell assemblies. In the horizontal projection plane, in two adjacent battery cell assemblies, the projections of the two adjacent pole groups are both located within the projection range of the same protective member 40.

[0158] In some specific examples, such as Figure 2 As shown, the number of battery cell assemblies is six, and the multiple battery cell assemblies are arranged in sequence along the second direction Y. Furthermore, a protective member 40 is correspondingly provided at the bottom of two adjacent pole groups in two adjacent battery cell assemblies, that is, the number of protective members 40 is five, and the multiple protective members 40 are arranged in parallel and at intervals in the second direction Y.

[0159] In the above technical solution, by arranging the protective member 40 between two adjacent battery cell assemblies, in the horizontal projection plane, in the two adjacent battery cell assemblies, the projections of the two adjacent pole groups are both located within the projection range of the same protective member 40, which not only can effectively save the installation space required for the protective member 40, but also can effectively reduce the number of protective members 40.

[0160] In some embodiments of the present application, Figure 4-Figure 7 As shown, the protective member 40 includes: a reinforcing plate portion 41 and two guard plate portions 42, the reinforcing plate portion 41 extends along the first direction X and is aligned with the gap between the two battery cell assemblies in the vertical direction (eg Figure 4 The two guard plate portions 42 are respectively connected to both sides of the reinforcing plate portion 41 in the second direction Y, and extend away from the reinforcing plate portion 41 along the second direction Y, wherein the thickness of the reinforcing plate portion 41 in the up-down direction is greater than the thickness of the guard plate portion 42 in the up-down direction.

[0161] It should be noted that in some specific examples, such as Figure 4 As shown, the up-down direction is the third direction Z, the third direction Z is the height direction of the battery device 100, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other. In some specific examples, such as Figure 4 and Figure 5 As shown, the reinforcing plate portion 41 is arranged between the two guard plate portions 42. In the third direction Z, the reinforcing plate portion 41 is opposite to the gap between two adjacent battery cell assemblies and is located on the side of the battery cell assembly facing the bottom guard plate 20.

[0162] For example Figure 6 indivual Figure 7As shown, the two guard plate portions 42 are rectangular plate-shaped, and the two guard plate portions 42 are respectively connected to the two ends of the reinforcing plate portion 41 in the second direction Y. Furthermore, the thickness of the reinforcing plate portion 41 in the third direction Z is greater than the thickness of the guard plate portion 42 in the third direction Z.

[0163] In the above technical solution, a reinforcing plate portion 41 and two guard plate portions 42 are provided in the protective member 40, the reinforcing plate portion 41 extends along the first direction X and is opposite to the gap between the two battery cell assemblies in the up and down directions, and the two guard plate portions 42 are respectively connected to the two sides of the reinforcing plate portion 41 in the second direction Y, and extend away from the reinforcing plate portion 41 along the second direction Y, wherein the thickness of the reinforcing plate portion 41 in the up and down directions is greater than the thickness of the guard plate portion 42 in the up and down directions, which can take into account the structural strength and material usage of the protective member 40, thereby reducing the weight of the protective member 40 while meeting the protection requirements.

[0164] In some embodiments of the present application, Figure 5 and Figure 7 As shown, the lower surface of the reinforcing plate portion 41 is flush with the lower surface of the guard plate portion 42 .

[0165] It should be noted that the flush underside surfaces of the reinforcing plate portion 41 and the guard plate portion 42 can make the support and protection of the protective member 40 more uniform and stable, thereby helping to disperse the impact force from the bottom and provide more reliable protection. In addition, it can effectively save the installation space of the protective member 40, thereby effectively improving the compactness of the battery device 100.

[0166] In the above technical solution, by arranging the lower surface of the reinforcing plate portion 41 to be flush with the lower surface of the guard plate portion 42 , not only the protective effect of the protective member 40 can be effectively enhanced, but also the compactness of the battery device 100 can be effectively improved.

[0167] In some embodiments of the present application, Figure 5 and Figure 7 As shown, a cavity 411 is formed in the reinforcing plate portion 41 , and the number of the cavity 411 is one, or the number of the cavity 411 is multiple, and the multiple cavities 411 are arranged at intervals along the second direction Y.

[0168] For example, the number of cavities 411 may be one; for another example, the number of cavities 411 may be multiple, for example, the number of cavities 411 may be two, three, four, five, or more than six. Figure 5 and Figure 7 As shown, there are two cavities 411 , and the plurality of cavities 411 are arranged at intervals in the second direction Y.

[0169] In the above technical solution, by setting a cavity 411 in the reinforcing plate portion 41, the number of the cavity 411 is one, or the number of the cavity 411 is multiple, and the multiple cavities 411 are arranged at intervals along the second direction Y, the structural strength of the reinforcing plate portion 41 can be effectively improved, and the material utilization rate can be effectively improved.

[0170] In some embodiments of the present application, Figure 7 As shown, the cavity 411 extends along the first direction X and passes through both end surfaces of the reinforcing plate portion 41 in the first direction X.

[0171] In some specific examples, such as Figure 7 As shown, the cavity 411 extends along the first direction X, that is, the extension direction of the cavity 411 is consistent with the length direction of the battery device 100. The cavity 411 passes through the end surfaces of the reinforcing plate portion 41 at both ends in the first direction X. This not only enables the reinforcing plate portion 41 to maintain sufficient strength and rigidity, effectively reduces the risk of local stress concentration, thereby contributing to uniform stress distribution, but also contributes to heat dissipation of the battery cell 30, thereby effectively improving heat dissipation performance.

[0172] In the above technical solution, by extending the cavity 411 along the first direction X and penetrating the two end surfaces of the reinforcing plate portion 41 in the first direction X, not only the reliability of the force applied to the reinforcing plate portion 41 can be effectively improved, but also the heat dissipation of the battery cell 30 can be facilitated, thereby effectively improving the heat dissipation performance.

[0173] In some embodiments of the present application, the protective member 40 is a single piece.

[0174] It should be noted that the protective member 40 is a one-piece component, meaning that it is manufactured from a single material and a single-piece molding process, rather than being assembled from multiple parts. The one-piece protective member 40 has no joints or assembly interfaces, effectively reducing the risk of structural problems caused by joint failure. Furthermore, the one-piece protective member 40 eliminates the need for complex assembly steps such as multi-part machining, positioning, and fastening, thereby significantly improving production efficiency.

[0175] In the above technical solution, by providing the protective member 40 as an integral member, the overall structural strength of the protective member 40 can be effectively improved. In addition, the difficulty of processing and assembly can be effectively reduced, thereby effectively improving work efficiency.

[0176] In some embodiments of the present application, Figure 4 and Figure 5 As shown, the protection member 40 is disposed between the bottom guard plate 20 and the plurality of battery cells 30 .

[0177] In some specific examples, such as Figure 4 and Figure 5 As shown, the protective member 40 is in direct contact with or close to the battery cells 30 and is located above the bottom guard plate 20. Therefore, when an external impact acts on the bottom of the battery device 100, the protective member 40 can serve as an additional protective layer to absorb and disperse the impact force from the outside, thereby reducing the impact of the external impact on the battery cells 30. In addition, the location of the protective member 40 between the bottom guard plate 20 and the multiple battery cells 30 facilitates maintenance of the protective member 40, thereby effectively improving the maintenance efficiency of the protective member 40.

[0178] In the above technical solution, the protective member 40 is disposed between the bottom guard plate 20 and the plurality of battery cells 30 , which can not only effectively protect the battery cells 30 , but also facilitate the maintenance of the protective member 40 , thereby effectively improving the maintenance efficiency of the protective member 40 .

[0179] In some embodiments of the present application, Figure 4 and Figure 5 As shown, a bonding area is provided on the side surface of the battery cell 30 shell facing the bottom guard plate 20 . The bonding area is provided on the shoulder of the battery cell 30 , and the protective member 40 is bonded to the bonding area of ​​the battery cell 30 .

[0180] In some specific examples, such as Figure 4 and Figure 5 As shown, the protective member 40 is bonded to the bonding area on the shoulder of the battery cell 30, which effectively simplifies the connection between the protective member 40 and the battery cell 30 and ensures a secure and reliable connection. In addition, the bonding area is spaced apart from the terminal 31 and the explosion-proof valve of the battery cell 30, so that the explosion-proof valve of the terminal 31 and the battery cell 30 are not affected by the bonding area.

[0181] In the above technical solution, a bonding area is provided on the surface of the shell of the battery cell 30 facing the bottom guard plate 20, and the bonding area is provided on the shoulder of the battery cell 30. The protective member 40 is bonded to the bonding area of ​​the battery cell 30, which can effectively improve and simplify the connection method between the protective member 40 and the battery cell 30.

[0182] In some embodiments of the present application, Figure 4 and Figure 5As shown, there are multiple battery cell assemblies, and the multiple battery cell assemblies are arranged in sequence along the second direction Y, which is the length direction of the battery cell 30. The protective member 40 is arranged between two adjacent battery cell assemblies, and the protective member 40 includes: a reinforcing plate portion 41 and two guard plate portions 42. The reinforcing plate portion 41 extends along the first direction X and is opposite to the gap between the two battery cell assemblies in the up and down directions. The first direction X is the thickness direction of the battery cell 30. The two guard plate portions 42 are respectively connected to both sides of the reinforcing plate portion 41 in the second direction Y, and extend away from the reinforcing plate portion 41 along the second direction Y. The reinforcing plate portion 41 is connected to the bonding area of ​​the two adjacent battery cell assemblies.

[0183] In some specific examples, such as Figure 4 As shown, the number of battery cell assemblies is six, and the multiple battery cell assemblies are arranged in sequence along the length direction of the battery cell 30, for example Figure 5 As shown, a protective member 40 is provided on the lower side of the gap between two adjacent battery cell assemblies, and the reinforcing plate portion 41 of the protective member 40 extends along the thickness direction of the battery cell 30, and the side surfaces facing one side of the battery cell assembly are respectively bonded to the bonding areas of the two adjacent battery assemblies. Furthermore, the two guard plate portions 42 are respectively connected to the two sides of the reinforcing plate portion 41 in the length direction of the battery cell 30, and extend away from the reinforcing plate portion 41 along the length direction of the battery cell 30.

[0184] In the above technical solution, by setting the number of battery cell assemblies to multiple, the multiple battery cell assemblies are arranged in sequence along the second direction Y, and the protective member 40 is arranged between two adjacent battery cell assemblies. The protective member 40 includes: a reinforcing plate portion 41 and two protective plate portions 42. The reinforcing plate portion 41 extends along the first direction X and is opposite to the gap between the two battery cell assemblies in the vertical direction. The first direction X is the thickness direction of the battery cell 30. The two protective plate portions 42 are respectively connected to the two sides of the reinforcing plate portion 41 in the second direction Y and extend away from the reinforcing plate portion 41 along the second direction Y. The reinforcing plate portion 41 is connected to the bonding area of ​​the two adjacent battery cell assemblies. This can optimize the layout and structure of the protective member 40, thereby effectively improving the protective effect of the protective member 40 on the battery device 100.

[0185] In some embodiments of the present application, Figure 4 and Figure 5 As shown, the battery device 100 further includes an electrical connection piece 50 connected to the pole 31 . In the horizontal projection plane, the guard plate portion 42 is disposed between the electrical connection piece 50 and the bottom guard plate 20 .

[0186] In some specific examples, such as Figure 5As shown, the electrical connection piece 50 is on the upper side of the guard plate portion 42, and the bottom guard plate 20 is located on the lower side of the guard plate portion 42. That is, in the horizontal projection plane, the guard plate portion 42 is arranged between the electrical connection piece 50 and the bottom guard plate 20. Thus, additional physical protection can be provided for the electrical connection piece 50 to prevent short circuits or other electrical failures caused by external impact or contact with foreign objects.

[0187] In the above technical solution, in the horizontal projection plane, the guard plate portion 42 is disposed between the electrical connection piece 50 and the bottom guard plate 20 , which can effectively protect the electrical connection piece 50 and thus effectively improve the reliability of the electrical connection piece 50 .

[0188] In some embodiments of the present application, Figure 5 As shown, the guard plate portion 42 and the electrical connection piece 50 are spaced apart in the vertical direction.

[0189] In some specific examples, such as Figure 5 As shown, the guard plate portion 42 and the electrical connection piece 50 are spaced apart in the up and down directions, that is, there is a space between the guard plate portion 42 and the electrical connection piece 50 in the up and down directions. Therefore, when the guard plate portion 42 is deformed by an external impact, the gap between the guard plate portion 42 and the electrical connection piece 50 can provide the necessary space for the deformation of the guard plate portion 42, so that the guard plate portion 42 can fully absorb the energy generated by the impact, thereby effectively improving the protection effect.

[0190] In the above technical solution, by arranging the guard plate portion 42 and the electrical connection piece 50 at intervals in the upper and lower directions, the guard plate portion 42 has sufficient deformation space when deformed by external impact, thereby effectively absorbing the energy generated by the impact and effectively improving the protection effect.

[0191] In some embodiments of the present application, Figure 5 As shown, a cavity 411 is formed in the reinforcing plate portion 41 .

[0192] In some specific examples, such as Figure 5 As shown, the interior of the reinforcement plate portion 41 is a cavity 411. Providing the cavity 411 structure inside the reinforcement plate can, on the one hand, effectively reduce the material usage of the protective member 40, thereby effectively reducing the weight of the protective member 40, and on the other hand, effectively improve the material utilization rate of the protective member 40.

[0193] In the above technical solution, by providing the cavity 411 in the reinforcing plate portion 41 , not only the weight of the protective member 40 can be effectively reduced, but also the material utilization rate of the protective member 40 can be effectively improved.

[0194] In some embodiments of the present application, Figure 2 and Figure 3As shown, two limiting beams 60 are arranged at intervals in a first direction X in the box body 10, and the two limiting beams 60 extend along a second direction Y perpendicular to the first direction X. A plurality of battery cells 30 are arranged between the two limiting beams 60, and both end edges of the reinforcing plate portion 41 in the first direction X exceed both end edges of the guard plate portion 42. The portion of the reinforcing plate portion 41 that exceeds the guard plate portion 42 is formed as an extension section 412, and the extension section 412 is fixedly connected to the limiting beams 60.

[0195] In some specific examples, such as Figure 2 and Figure 3 As shown, the protective member 40 is bolted to the limiting beam 60 via the extension section 412, thereby enabling the protective member 40 to be reliably fixed on the two limiting beams 60, thereby enabling the protective member 40 to effectively reduce the displacement of the limiting beam 60 in the first direction X, thereby effectively improving the rigidity and stability of the battery device 100.

[0196] In the above technical solution, two limiting beams 60 are arranged in a first direction X at intervals in the box body 10, and the two limiting beams 60 extend along a second direction Y perpendicular to the first direction X. A plurality of battery cells 30 are arranged between the two limiting beams 60, and both end edges of the reinforcing plate portion 41 in the first direction X exceed both end edges of the guard plate portion 42. The portion of the reinforcing plate portion 41 that exceeds the guard plate portion 42 is formed as an extension section 412, and the extension section 412 is fixedly connected to the limiting beams 60, which can effectively improve the rigidity and stability of the battery device 100.

[0197] In some embodiments of the present application, the protective member 40 is an insulating member.

[0198] In some specific examples, the protective member 40 is an insulator, thereby preventing current from passing through, thereby effectively reducing the risk of short circuits or other electrical faults caused by accidental contact. Furthermore, the protective member 40 can be made of a non-metallic material, thereby ensuring that the protective member 40 has good insulation properties and reliable structural strength.

[0199] In the above technical solution, by setting the protective member 40 as an insulating member, short circuits or other electrical faults caused by accidental contact can be effectively reduced, thereby effectively improving the reliability of the battery device 100.

[0200] In some embodiments of the present application, the protective member 40 is a resin fiber composite material member.

[0201] It should be noted that the resin fiber composite material is composed of a matrix resin and reinforcing fibers. The resin in the resin fiber composite material can be a thermosetting resin or a thermoplastic polyamide, and the fibers in the resin fiber composite material can be glass fibers, carbon fibers, ultra-high molecular weight polyethylene fibers, aramid fibers or basalt fibers. This can effectively improve the specific strength and impact resistance of the protective part 40.

[0202] In the above technical solution, by setting the protective member 40 as a resin fiber composite material, the specific strength and impact resistance of the protective member 40 can be effectively improved, thereby effectively reducing the risk of damage to the battery cell 30 due to external impact, and thus effectively protecting the battery cell 30.

[0203] In some embodiments of the present application, the flexural modulus of the protective element 40 is greater than or equal to 10 GPa.

[0204] For example, the flexural modulus of the protective member 40 may be 10 GPa, 11 GPa, 12 GPa, 13 GPa, or 14 GPa or greater. Setting the flexural modulus of the protective member 40 to be greater than or equal to 10 GPa allows the protective member 40 to maintain structural integrity when subjected to external impact or pressure, reducing the risk of protective function failure due to deformation. Furthermore, the protective member 40 is less likely to permanently deform during use, thereby effectively improving the durability of the protective member 40.

[0205] In the above technical solution, setting the bending modulus of the protective member 40 to be greater than or equal to 10 GPa can not only effectively improve the protective effect of the protective member 40 , but also effectively improve the durability of the protective member 40 , thereby effectively extending the service life of the protective member 40 .

[0206] In some embodiments of the present application, Figure 2 As shown, two limiting beams 60 are arranged at intervals in a first direction X in the box body 10, and the two limiting beams 60 extend along a second direction Y perpendicular to the first direction X. A plurality of battery cells 30 are arranged between the two limiting beams 60, and the protective member 40 extends along the first direction X. Both ends of the protective member 40 in the first direction X are fixedly connected to the two limiting beams 60.

[0207] In some specific examples, such as Figure 2 As shown, there are multiple protective members 40, and the multiple protective members 40 are extended along the first direction X. One end of the multiple protective members 40 in the first direction X is fixedly connected to a limiting beam 60, and the other end of the multiple protective members 40 in the first direction X is fixedly connected to another limiting beam 60. As a result, the protective members 40 can effectively reduce the displacement of the limiting beam 60 in the first direction X, thereby effectively improving the rigidity and stability of the battery device 100.

[0208] In the above technical solution, by setting the protective member 40 to extend along the first direction X, and the two ends of the protective member 40 in the first direction X are fixedly connected to the two limiting beams 60, the protective member 40 can effectively reduce the displacement of the limiting beams 60 in the first direction X, thereby effectively improving the rigidity and stability of the battery device 100.

[0209] In some embodiments of the present application, Figure 3 As shown, the protective member 40 includes: a reinforcing plate portion 41 and two guard plate portions 42, the reinforcing plate portion 41 extends along the first direction X, and the two guard plate portions 42 are respectively connected to both sides of the reinforcing plate portion 41 in the second direction Y, wherein both end edges of the reinforcing plate portion 41 in the first direction X exceed both end edges of the guard plate portion 42, and the portion of the reinforcing plate portion 41 that exceeds the guard plate portion 42 is formed as an extension section 412, and the protective member 40 is fixedly connected to the limiting beam 60 through the extension section 412.

[0210] In some specific examples, the protective member 40 is bolted to the limiting beams 60 via the extension section 412, thereby reliably fixing the protective member 40 to the two limiting beams 60. Furthermore, because the thickness of the reinforcing plate portion 41 in the vertical direction is greater than the thickness of the guard plate portion 42 in the vertical direction, that is, the thickness of the extension section 412 in the vertical direction is greater than the thickness of the guard plate portion 42 in the vertical direction, the structural strength of the connection between the protective member 40 and the limiting beams 60 can be effectively enhanced.

[0211] In the above technical solution, both end edges of the reinforcing plate portion 41 in the first direction X extend beyond both end edges of the guard plate portion 42, and the portion of the reinforcing plate portion 41 extending beyond the guard plate portion 42 is formed as an extension section 412. The protective member 40 is fixedly connected to the limiting beam 60 through the extension section 412, which can effectively strengthen the structural strength of the connection between the protective member 40 and the limiting beam 60, thereby effectively improving the reliability of the connection between the protective member 40 and the limiting beam 60.

[0212] In some embodiments of the present application, the protective member 40 is bonded to the bottom guard plate 20 , or the protective member 40 and the bottom guard plate 20 are integrated into one piece.

[0213] For example, the protective part 40 is adhesively connected to the bottom guard plate 20, that is, the protective part 40 is bonded to the bottom guard plate 20 by an adhesive, thereby facilitating the assembly of the protective part 40 and effectively reducing the use of mechanical fasteners, thereby effectively simplifying the structural structure; for another example, the protective part 40 and the bottom guard plate 20 are integrated into one piece, that is, the protective part 40 and the bottom guard plate 20 are formed into an integral component by co-molding, lamination, insert injection molding, etc., thereby effectively improving the structural strength of the protective part 40, effectively reducing assembly errors, and improving product consistency.

[0214] In the above technical solution, by bonding the protective part 40 to the bottom guard plate 20, the assembly efficiency of the protective part 40 can be effectively improved and the structural structure can be effectively simplified; by integrating the protective part 40 and the bottom guard plate 20 into an integral part, the structural strength of the protective part 40 can be effectively improved and the assembly accuracy can be effectively improved.

[0215] In some embodiments of the present application, Figures 8-10 As shown, the protective member 40 is integrated with the bottom guard plate 20 into a single piece.

[0216] In some specific examples, such as Figures 8-10 As shown, the protective member 40 and the bottom guard plate 20 are integrated into a single structure, which can reduce the number of parts in the assembly process and simplify the assembly process. Furthermore, the edge of the bottom guard plate 20 is provided with a fixing hole 201, through which the bottom guard plate 20 can be bolted to the box body 10.

[0217] In the above technical solution, by integrating the protective member 40 and the bottom guard plate 20 into one piece, the number of parts in the assembly process of the battery device 100 can be reduced, thereby simplifying the assembly process of the battery device 100 and effectively improving the assembly efficiency of the battery device 100.

[0218] In some embodiments of the present application, Figures 8-10 As shown, the protective member 40 is embedded in the bottom guard plate 20 .

[0219] It should be noted that embedding the protective member 40 within the bottom guard plate 20 allows for a tighter fit between the protective member 40 and the bottom guard plate 20, thereby reducing the risk of relative displacement or loosening due to external impact. Furthermore, embedding the protective member 40 within the bottom guard plate 20 reduces the additional space required for installing the protective member 40, thereby effectively improving space utilization within the battery device 100.

[0220] In the above technical solution, by embedding the protective member 40 in the bottom guard plate 20 , not only the stability of the protective member 40 can be effectively improved, but also the space utilization rate inside the battery device 100 can be effectively improved.

[0221] In some embodiments of the present application, Figure 11 As shown, the bottom guard plate 20 includes a buffer layer 21 and two composite material layers 22. The two composite material layers 22 are respectively arranged in the upper and lower directions (for example, Figure 11 On both sides of the Z direction (shown in the figure), the protective member 40 is arranged between the composite material layer 22 and the buffer layer 21.

[0222] In some specific examples, such as Figure 11As shown, the buffer layer 21 is disposed between two composite material layers 22. The buffer layer 21 effectively absorbs impacts and reduces vibration. The composite material layers 22 on either side of the buffer layer 21 in the third direction Z provide reliable structural strength and support for the bottom guard plate 20, while effectively protecting the buffer layer 21. The protective member 40 is disposed between the composite material layers 22 and the buffer layer 21, enabling the protective member 40 to more effectively absorb external impacts, while the composite material layers 22 effectively protect the protective member 40.

[0223] In the above technical solution, a buffer layer 21 and two composite material layers 22 are arranged in the bottom guard plate 20. The two composite material layers 22 are respectively arranged on both sides of the buffer layer 21 in the up and down directions. The protective part 40 is arranged between the composite material layer 22 and the buffer layer 21, which can effectively improve the impact resistance and structural strength of the bottom guard plate 20, thereby effectively improving the reliability of the bottom guard plate 20.

[0224] In some embodiments of the present application, Figure 11 As shown, the bottom guard plate 20 further includes a metal layer 23 , which is arranged between the buffer layer 21 and the composite material layer 22 located on the lower side of the buffer layer 21 .

[0225] In some specific examples, such as Figure 11 As shown, the metal layer 23 is located below the buffer layer 21 and adjacent to the underlying composite material layer 22. It should be noted that the metal layer 23 effectively enhances the overall mechanical strength and compressive strength of the bottom guard plate 20, thereby further reducing the risk of deformation or damage to the bottom guard plate 20 when subjected to external impact or heavy pressure. Furthermore, the metal layer 23 exhibits excellent thermal conductivity, effectively transferring heat from the battery cells 30 to the exterior of the bottom guard plate 20 during operation of the battery device 100, aiding in heat dissipation and reducing the possibility of localized overheating.

[0226] In the above technical solution, by setting a metal layer 23 in the bottom guard plate 20, the metal layer 23 is arranged between the buffer layer 21 and the composite material layer 22 located on the lower side of the buffer layer 21, which can not only further improve the rigidity and structural strength of the bottom guard plate 20, but also improve the heat dissipation performance of the battery device 100.

[0227] In some embodiments of the present application, Figure 12-15 As shown, the protection member 40 is disposed on the side of the buffer layer 21 facing the metal layer 23 .

[0228] For example, when the material of the protective member 40 is consistent with that of the metal layer 23, the protective member 40 can be welded to the metal layer 23; or when the material of the protective member 40 is inconsistent with that of the metal layer 23, the protective member 40 can be bonded to the metal layer 23. Figure 15As shown, the protective member 40 is disposed on a side of the buffer layer 21 facing the metal layer 23 , and the protective member 40 is located within the thickness range of the buffer layer 21 in the third direction Z.

[0229] In the above technical solution, by arranging the protective part 40 on the side of the buffer layer 21 facing the metal layer 23, the protective part 40 can be doubly protected by the buffer layer 21 and the metal layer 23, effectively reducing the risk of damage or displacement of the protective part 40 due to external impact, thereby further improving the reliability and stability of the protective part 40.

[0230] In some embodiments of the present application, Figure 11-14 As shown, the metal layer 23 and the composite material layer 22 located on the upper side of the metal layer 23 cooperate to define a buffer cavity 231 , and the buffer layer 21 is filled in the buffer cavity 231 .

[0231] In some specific examples, such as Figure 11 As shown, the metal layer 23 is formed with a groove through a stamping process. The groove of the metal layer 23 and the composite material layer 22 located on the upper side of the metal layer 23 together form a buffer cavity 231. The buffer layer 21 is filled in the buffer cavity 231. As a result, the buffer layer 21 can be confined within the buffer cavity 231, allowing the buffer layer 21 to more effectively absorb and disperse external impact forces. In addition, filling the buffer layer 21 in the buffer cavity 231 can effectively save the installation space of the buffer layer 21, thereby effectively improving the compactness of the bottom guard plate 20.

[0232] In the above technical solution, the metal layer 23 and the composite material layer 22 located on the upper side of the metal layer 23 are combined to define a buffer cavity 231, and the buffer layer 21 is filled in the buffer cavity 231, which can not only effectively improve the buffering effect of the buffer layer 21, but also effectively save the installation space of the buffer layer 21, thereby effectively improving the compactness of the bottom guard plate 20.

[0233] In some embodiments of the present application, Figure 11 As shown, the number of the buffer cavity 231 is one, or the number of the buffer cavity 231 is multiple, and the multiple buffer cavities 231 are arranged at intervals along the first direction X.

[0234] For example, the number of the buffer cavity 231 may be one; for another example, the number of the buffer cavity 231 may be multiple, for example, the number of the buffer cavity 231 may be two, three, four, five or more than six. Figure 11 As shown, there are three buffer cavities 231 , which are arranged at intervals along the first direction X. Furthermore, there are also three buffer layers 21 , which are arranged in a one-to-one correspondence with the buffer cavities 231 .

[0235] In the above technical solution, the number of buffer cavities 231 is set to one, or the number of buffer cavities 231 is set to multiple, and multiple buffer cavities 231 are arranged at intervals along the first direction X, which can effectively meet the protection requirements of different types of battery devices 100, thereby effectively improving the flexibility of the bottom guard plate 20.

[0236] In some embodiments of the present application, Figure 11 As shown, the metal layer 23 is a steel plate or an aluminum alloy plate; and / or the thickness of the metal layer 23 is greater than or equal to 0.4 mm.

[0237] For example, the metal layer 23 is a steel plate or an aluminum alloy plate. For another example, the thickness of the metal layer 23 is greater than or equal to 0.4 mm. For another example, the metal layer 23 is a steel plate or an aluminum alloy plate, and the thickness of the metal layer 23 is greater than or equal to 0.4 mm. For example, the thickness of the metal layer 23 can be 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, or 0.8 mm or more.

[0238] It should be noted that both steel plates and aluminum alloy plates have good structural strength, mechanical properties and thermal conductivity, and setting the plate thickness of the metal layer 23 to be greater than or equal to 0.4 mm can enable the metal layer 23 to have sufficient rigidity and compressive resistance, thereby enabling the bottom guard plate 20 to have sufficient protection capabilities.

[0239] In the above technical solution, the metal layer 23 is set to a steel plate or an aluminum alloy plate, and / or the plate thickness of the metal layer 23 is set to be greater than or equal to 0.4 mm, so that the metal layer 23 has reliable impact resistance, thereby effectively improving the protection performance of the bottom guard plate 20 to the battery device 100.

[0240] In some embodiments of the present application, the tensile strength of the metal layer 23 is greater than or equal to 500 MPa; and / or the yield strength of the metal layer 23 is greater than or equal to 300 MPa; and / or the elongation at break of the metal layer 23 is greater than or equal to 15%.

[0241] For example, the tensile strength of the metal layer 23 may be 500 MPa, 510 MPa, 520 MPa, 530 MPa, or 540 MPa or higher. For example, the yield strength of the metal layer 23 may be 300 MPa, 310 MPa, 320 MPa, 330 MPa, or 340 MPa or higher. For example, the elongation at break of the metal layer 23 may be 15%, 16%, 17%, 18%, or 19% or higher.

[0242] It should be noted that the tensile strength of the metal layer 23 is greater than or equal to 500 MPa, which means that the maximum stress that the metal layer 23 can withstand before being stretched to fracture is at least 500 MPa. The yield strength of the metal layer 23 is greater than or equal to 300 MPa, which means that the minimum stress that the metal layer 23 can withstand before it begins to permanently deform is at least 300 MPa. The elongation at break of the metal layer 23 is greater than or equal to 15%, which means that the ratio of the increase in length of the metal layer 23 before fracture to the original length is at least 15%.

[0243] In the above technical solution, the tensile strength of the metal layer 23 is set to be greater than or equal to 500 MPa, so that the metal layer 23 can have the ability to reliably resist external tensile force; the yield strength of the metal layer 23 is set to be greater than or equal to 300 MPa, so that the metal layer 23 can have sufficient elastic deformation ability; the elongation at break of the metal layer 23 is set to be greater than or equal to 15%, so that the metal layer 23 can have good ductility.

[0244] In some embodiments of the present application, Figure 2 As shown, the composite material layer 22 is a resin fiber composite material layer 22 .

[0245] It should be noted that resin-fiber composite materials have a high specific strength. In other words, by providing the composite material layer 22 as a resin-fiber composite material layer 22, the composite material layer 22 has sufficient mechanical strength while effectively reducing the weight of the composite material layer 22, thereby effectively reducing the weight of the battery device 100. In addition, the resin-fiber composite material has good corrosion resistance, thereby effectively improving the durability of the composite material layer 22.

[0246] In the above technical solution, by setting the composite material layer 22 as a resin fiber composite material layer 22 , not only the specific strength of the composite material layer 22 can be effectively improved, but also the durability of the bottom guard plate 20 can be effectively improved.

[0247] In some embodiments of the present application, the resin in the composite material layer 22 is a thermosetting resin or a thermoplastic polyamide; and / or, the fibers in the composite material layer 22 are glass fibers, carbon fibers, ultra-high molecular weight polyethylene fibers, aramid fibers, or basalt fibers.

[0248] It should be noted that thermosetting resins or thermoplastic polyamides have excellent mechanical strength and chemical corrosion resistance, and glass fiber, carbon fiber, ultra-high molecular weight polyethylene fiber, aramid fiber or basalt fiber all have high specific strength, light weight and high strength.

[0249] Furthermore, fixing holes 201 are provided on the edge of the composite material layer 22. Through the fixing holes 201 and the viscosity of the resin, the bottom guard plate 20 can be formed into an integral structure, thereby effectively improving the integrity and structural strength of the bottom guard plate 20, and further effectively improving the reliability of the bottom guard plate 20.

[0250] In the above technical solution, by setting the resin in the composite material layer 22 to a thermosetting resin or a thermoplastic polyamide, the mechanical strength and durability of the composite material layer 22 can be effectively improved; by setting the fibers in the composite material layer 22 to glass fibers, carbon fibers, ultra-high molecular weight polyethylene fibers, aramid fibers or basalt fibers, the weight of the composite material layer 22 can be effectively reduced while meeting the strength requirements, thereby effectively realizing the lightweight requirements of the bottom guard plate 20.

[0251] In some embodiments of the present application, the thickness of the composite material layer 22 located on the upper side of the buffer layer 21 is greater than or equal to 0.3 mm and less than or equal to 1.5 mm; and / or, the thickness of the composite material layer 22 located on the lower side of the buffer layer 21 is greater than or equal to 0.6 mm and less than or equal to 2 mm.

[0252] For example, the thickness of the composite material layer 22 located on the upper side of the buffer layer 21 can be 0.3 mm, 0.5 mm, 0.7 mm, 0.9 mm, 1.1 mm, 1.3 mm, and 1.5 mm. For example, the thickness of the composite material layer 22 located on the lower side of the buffer layer 21 can be 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, and 2 mm.

[0253] In the above technical solution, the thickness of the composite material layer 22 located on the upper side of the buffer layer 21 is set to be greater than or equal to 0.3 mm and less than or equal to 1.5 mm, and / or the thickness of the composite material layer 22 located on the lower side of the buffer layer 21 is set to be greater than or equal to 0.6 mm and less than or equal to 2 mm. This not only enables the composite material layer 22 to have sufficient structural strength, but also effectively controls the weight of the composite material layer 22, thereby taking into account the strength and weight requirements of the bottom guard plate 20.

[0254] In some embodiments of the present application, the buffer layer 21 is a foam material layer or a metal honeycomb structure layer.

[0255] It should be noted that foam is a lightweight material created by introducing gas into a base material to form a large number of tiny pores. These pores compress and deform during impact, absorbing and dissipating energy, effectively protecting internal components from direct impact. For example, foam can be made of polyurethane foam or polyethylene foam. Furthermore, foam is lightweight, which can help reduce the weight of the underbody guard 20.

[0256] A metal honeycomb structure is a layered structure composed of a series of neatly arranged small hexagonal or other shaped thin-walled metal units. It boasts extremely high specific strength and stiffness, making it less susceptible to deformation or damage under heavy loads. Furthermore, compared to solid metal plates of equal thickness, a metal honeycomb structure layer is lighter, effectively enabling lightweight design.

[0257] In the above technical solution, by setting the buffer layer 21 as a foam material layer or a metal honeycomb structure layer, not only can the energy absorption effect of the buffer layer 21 be effectively improved, thereby improving the protection effect of the battery device 100, but also the weight of the buffer layer 21 can be effectively reduced, thereby meeting the lightweight design requirements.

[0258] In some embodiments of the present application, Figure 2 As shown, the thickness of the buffer layer 21 is greater than or equal to 2 mm.

[0259] For example, the thickness of the buffer layer 21 can be 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, and 3 mm. Setting the thickness of the buffer layer 21 to be greater than or equal to 2 mm allows the buffer layer 21 to provide sufficient deformation space when the protective member 40 is subjected to an external impact to absorb and disperse the energy generated by the impact, thereby effectively reducing the impact force transmitted to the battery cell 30.

[0260] In the above technical solution, by setting the thickness of the buffer layer 21 to be greater than or equal to 2 mm, the deformation requirement of the buffer layer 21 can be effectively met, thereby effectively absorbing the energy generated by the external impact and further effectively protecting the battery device 100.

[0261] Second, as Figure 1 As shown, an embodiment of the present application provides an electric device 1 , which includes a battery device 100 according to the first aspect of the present application.

[0262] In the above technical solution, by setting the battery device 100 of the first aspect mentioned above in the electrical device 1, the risk of damage to the pole 31 of the battery cell 30 can be effectively reduced, and the protective effect of the bottom guard plate 20 on the battery cell 30 can be enhanced, thereby effectively improving the reliability of the electrical device 1.

[0263] The following will refer to Figure 2-Figure 15 The battery device 100 according to two specific embodiments of the present application is described.

[0264] like Figure 2-Figure 10 As shown, the battery device 100 includes a housing 10 , a bottom guard plate 20 , a protection member 40 and a plurality of battery cells 30 .

[0265] A accommodating cavity is formed in the box body 10, a bottom guard plate 20 is arranged at the bottom of the box body 10, a plurality of battery cells 30 are arranged in the accommodating cavity, and the poles 31 of at least some of the battery cells 30 are arranged toward the bottom guard plate 20, and the protective member 40 is arranged on the lower side of the plurality of battery cells 30.

[0266] like Figure 2 As shown, the protective member 40 includes a plurality of protective members 40 , which extend along a first direction X and are spaced apart in a second direction Y. The first direction X is the thickness direction of the battery cell 30 , and the second direction Y is the length direction of the battery cell 30 .

[0267] Multiple battery cells 30 are stacked along a first direction X to form a battery cell assembly. The number of battery cell assemblies is multiple, and the multiple battery cell assemblies are arranged in sequence along a second direction Y. The poles 31 of the multiple battery cells 30 of each battery cell assembly constitute two pole groups arranged at intervals in the second direction Y. In the horizontal projection plane, the projection of a protective member 40 covers the projection of at least one pole group.

[0268] Furthermore, if Figure 5 and Figure 9 As shown, the protective member 40 is provided between two adjacent battery cell assemblies. In the horizontal projection plane, in the two adjacent battery cell assemblies, the projections of the two adjacent pole groups are both located within the projection range of the same protective member 40 .

[0269] like Figure 6 As shown, the protective member 40 includes a reinforcing plate portion 41 and two guard plate portions 42, the reinforcing plate portion 41 extends along a first direction X and is opposite to the gap between the two battery cell assemblies in the up and down directions, the two guard plate portions 42 are respectively connected to the two sides of the reinforcing plate portion 41 in the second direction Y, and extend away from the reinforcing plate portion 41 along the second direction Y, wherein the thickness of the reinforcing plate portion 41 in the up and down directions is greater than the thickness of the guard plate portion 42 in the up and down directions, and the lower side surface of the reinforcing plate portion 41 is flush with the lower side surface of the guard plate portion 42.

[0270] Furthermore, if Figure 7 As shown, a cavity 411 is formed in the reinforcing plate portion 41 . There are two cavities 411 , which are arranged at intervals along the second direction Y. The cavities 411 extend along the first direction X and penetrate through both end surfaces of the reinforcing plate portion 41 in the first direction X. In addition, the protective member 40 is a single piece.

[0271] In one specific embodiment, Figures 8-15As shown, the bottom guard plate 20 includes a buffer layer 21, a metal layer 23, a protective member 40 and two composite material layers 22. The two composite material layers 22 are respectively arranged on both sides of the buffer layer 21 in the up and down directions. The protective member 40 is arranged between the composite material layer 22 and the buffer layer 21. The metal layer 23 is arranged between the buffer layer 21 and the composite material layer 22 located on the lower side of the buffer layer 21. The protective member 40 is arranged on the side of the buffer layer 21 facing the metal layer 23.

[0272] Furthermore, if Figure 11 As shown, the metal layer 23 and the composite material layer 22 located above the metal layer 23 together form a buffer cavity 231. The buffer layer 21 fills the buffer cavity 231. There are three buffer cavities 231, which are spaced apart along the first direction X. The metal layer 23 is a steel plate or an aluminum alloy plate, and the plate thickness of the metal layer 23 is greater than or equal to 0.4 mm. The tensile strength of the metal layer 23 is greater than or equal to 500 MPa, the yield strength of the metal layer 23 is greater than or equal to 300 MPa, and the elongation at break of the metal layer 23 is greater than or equal to 15%.

[0273] Composite material layer 22 is a resin-fiber composite material layer 22. The resin in resin-fiber composite material layer 22 is a thermosetting resin or thermoplastic polyamide, and the fibers in composite material layer 22 are glass fiber, carbon fiber, ultra-high molecular weight polyethylene fiber, aramid fiber, or basalt fiber. Furthermore, the thickness of composite material layer 22 located above buffer layer 21 is greater than or equal to 0.3 mm and less than or equal to 1.5 mm, and the thickness of composite material layer 22 located below buffer layer 21 is greater than or equal to 0.6 mm and less than or equal to 2 mm. Buffer layer 21 is a foam material layer or a metal honeycomb structure layer, and the thickness of buffer layer 21 is greater than or equal to 2 mm.

[0274] In another specific embodiment, Figure 2-Figure 7 As shown, the protective member 40 is disposed between the bottom guard plate 20 and the plurality of battery cells 30. Furthermore, a bonding area is provided on the side of the battery cell 30 housing facing the bottom guard plate 20. The bonding area is spaced apart from the terminal 31 and the explosion-proof valve of the battery cell 30. The protective member 40 is bonded to the bonding area of ​​the battery cell 30. Furthermore, the protective member 40 is bonded to the bottom guard plate 20.

[0275] like Figure 4 and Figure 5As shown, the battery device 100 also includes an electrical connection sheet 50 connected to the terminal 31. In the horizontal projection plane, the projection range of the protective member 40 covers at least a portion of the projection of the electrical connection sheet 50. Furthermore, the protective member 40 is a resin-fiber composite material and has good insulation properties. The resin in the resin-fiber composite material layer 22 is a thermosetting resin or thermoplastic polyamide, and the fibers in the composite material layer 22 are glass fibers, carbon fibers, ultra-high molecular weight polyethylene fibers, aramid fibers, or basalt fibers. In addition, the flexural modulus of the protective member 40 is greater than or equal to 10 GPa.

[0276] like Figure 2 and Figure 3 As shown, two limiting beams 60 are provided within the housing 10, spaced apart in a first direction X. The two limiting beams 60 extend in a second direction Y perpendicular to the first direction X, and a plurality of battery cells 30 are disposed between the two limiting beams 60. The protective member 40 includes a reinforcing plate portion 41 and two guard plate portions 42. The reinforcing plate portion 41 extends in the first direction X, and the two guard plate portions 42 are respectively connected to either side of the reinforcing plate portion 41 in the second direction Y. The ends of the reinforcing plate portion 41 in the first direction X extend beyond the ends of the guard plate portion 42. The portion of the reinforcing plate portion 41 that extends beyond the guard plate portion 42 forms an extension 412. The protective member 40 is fixedly connected to the limiting beams 60 via the extension 412.

[0277] The battery device 100 can effectively reduce the risk of damage to the terminal 31 of the battery cell 30 during use, enhance the protective effect of the bottom guard plate 20 on the battery cell 30 , and thus effectively improve the reliability of the battery device 100 .

[0278] 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 (10), wherein the box body (10) defines a receiving cavity; A bottom guard plate (20), the bottom guard plate (20) being arranged at the bottom of the box body (10); A plurality of battery cells (30), wherein the plurality of battery cells (30) are arranged in the accommodating cavity, and the poles (31) of at least some of the battery cells (30) are arranged toward the bottom guard plate (20); A protective member (40) is provided on the lower side of the plurality of battery cells (30), wherein in a horizontal projection plane, the projection of the pole (31) at least partially disposed toward the bottom guard plate (20) is located within the projection range of the protective member (40).

2. The battery device according to claim 1, wherein: A plurality of battery cells (30) are stacked and arranged along a first direction (X) to form a battery cell assembly. The protective member (40) extends along the first direction (X), which is the thickness direction of the battery cells (30).

3. The battery device according to claim 2, characterized in that There are multiple battery cell assemblies, and the multiple battery cell assemblies are arranged in sequence along a second direction (Y), and the second direction (Y) is the length direction of the battery cell (30). There are multiple protective members (40), and the multiple protective members (40) are arranged at intervals in the second direction (Y).

4. The battery device according to claim 2, wherein: The poles (31) of the plurality of battery cells (30) of the battery cell assembly form two pole groups spaced apart in a second direction (Y), wherein the second direction (Y) is the length direction of the battery cells (30). In a horizontal projection plane, the projection of one of the protective elements (40) covers at least the projection of one of the pole groups.

5. The battery device according to claim 2, wherein: There are multiple battery cell assemblies, and the multiple battery cell assemblies are arranged in sequence along a second direction (Y), and the second direction (Y) is the length direction of the battery cell (30). The protective member (40) is provided between two adjacent battery cell assemblies. In a horizontal projection plane, in two adjacent battery cell assemblies, the projections of the two adjacently arranged pole groups are both located within the projection range of the same protective member (40).

6. The battery device according to claim 5, characterized in that The protective member (40) includes: a reinforcing plate portion (41) and two guard plate portions (42), wherein the reinforcing plate portion (41) extends along the first direction (X) and is opposite to the gap between the two battery cell assemblies in the up-down direction, and the two guard plate portions (42) are respectively connected to both sides of the reinforcing plate portion (41) in the second direction (Y) and extend away from the reinforcing plate portion (41) in the second direction (Y), wherein the thickness of the reinforcing plate portion (41) in the up-down direction is greater than the thickness of the guard plate portion (42) in the up-down direction.

7. The battery device according to claim 6, characterized in that The lower surface of the reinforcing plate portion (41) is flush with the lower surface of the guard plate portion (42).

8. The battery device according to claim 6, wherein: A cavity (411) is formed in the reinforcing plate portion (41), and the number of the cavity (411) is one, or the number of the cavity (411) is multiple, and the multiple cavities (411) are arranged at intervals along the second direction (Y).

9. The battery device according to claim 8, characterized in that The cavity (411) extends along the first direction (X) and passes through both end surfaces of the reinforcing plate portion (41) in the first direction (X).

10. The battery device according to claim 1, wherein: The protective member (40) is an integral member.

11. The battery device according to claim 1, wherein: The protection member (40) is provided between the bottom guard plate (20) and the plurality of battery cells (30).

12. The battery device according to claim 11, wherein: A bonding area is provided on the side surface of the battery cell (30) shell facing the bottom guard plate (20), and the bonding area is provided on the shoulder of the battery cell. The protective member (40) is bonded and connected to the bonding area of ​​the battery cell (30).

13. The battery device according to claim 12, characterized in that There are multiple battery cell assemblies, and the multiple battery cell assemblies are arranged in sequence along a second direction (Y), and the second direction (Y) is the length direction of the battery cell (30). The protective member (40) is provided between two adjacent battery cell assemblies, and the protective member (40) includes: a reinforcing plate portion (41) and two guard plate portions (42). The reinforcing plate portion (41) extends along a first direction (X) and is opposite to the gap between the two battery cell assemblies in the upper and lower directions. The first direction (X) is the thickness direction of the battery cell (30). The two guard plate portions (42) are respectively connected to both sides of the reinforcing plate portion (41) in the second direction (Y) and extend away from the reinforcing plate portion (41) along the second direction (Y). The reinforcing plate portion (41) is connected to the bonding area of ​​the two adjacent battery cell assemblies.

14. The battery device according to claim 13, wherein: The battery device (100) further comprises an electrical connection piece (50) connected to the pole (31); in a horizontal projection plane, the guard plate portion (42) is arranged between the electrical connection piece (50) and the bottom guard plate (20).

15. The battery device according to claim 14, characterized in that The guard plate portion (42) and the electrical connection piece (50) are arranged at intervals in the vertical direction.

16. The battery device according to claim 13, characterized in that A cavity (411) is formed in the reinforcing plate portion (41).

17. The battery device according to claim 13, wherein: Two limiting beams (60) are arranged in a first direction (X) at intervals in the box body (10), the two limiting beams (60) extend in a second direction (Y) perpendicular to the first direction (X), and the plurality of battery cells (30) are arranged between the two limiting beams (60). Both end edges of the reinforcing plate portion (41) in the first direction (X) extend beyond both end edges of the guard plate portion (42); the portion of the reinforcing plate portion (41) extending beyond the guard plate portion (42) forms an extended section (412); and the extended section (412) is fixedly connected to the limiting beam (60).

18. The battery device according to claim 11, wherein: The protective member (40) is an insulating member.

19. The battery device according to claim 15, wherein: The protective member (40) is a resin fiber composite material member.

20. The battery device according to claim 19, wherein: The bending modulus of the protective member (40) is greater than or equal to 10 GPa.

21. The battery device according to claim 12, wherein: Two limiting beams (60) are arranged in a first direction (X) at intervals in the box body (10), the two limiting beams (60) extend in a second direction (Y) perpendicular to the first direction (X), and the plurality of battery cells (30) are arranged between the two limiting beams (60). The protective member (40) extends along the first direction (X), and two ends of the protective member (40) in the first direction (X) are fixedly connected to the two limiting beams (60).

22. The battery device according to claim 21, characterized in that The protective member (40) comprises: a reinforcing plate portion (41) and two guard plate portions (42), wherein the reinforcing plate portion (41) extends along the first direction (X), and the two guard plate portions (42) are respectively connected to both sides of the reinforcing plate portion (41) in the second direction (Y). Wherein, both end edges of the reinforcing plate portion (41) in the first direction (X) exceed both end edges of the guard plate portion (42), the portion of the reinforcing plate portion (41) that exceeds the guard plate portion (42) forms an extension section (412), and the protective member (40) is fixedly connected to the limiting beam (60) via the extension section (412).

23. The battery device according to claim 11, wherein: The protective member (40) is bonded to the bottom guard plate (20), or the protective member (40) and the bottom guard plate (20) are integrated into one piece.

24. The battery device according to any one of claims 1 to 10, characterized in that: The protective member (40) and the bottom guard plate (20) are integrated into a single piece.

25. The battery device according to claim 24, characterized in that The protective member (40) is embedded in the bottom guard plate (20).

26. The battery device according to claim 25, characterized in that The bottom guard plate (20) comprises a buffer layer (21) and two composite material layers (22), the two composite material layers (22) being respectively arranged on both sides of the buffer layer (21) in the up and down directions, and the protective member (40) being arranged between the composite material layer (22) and the buffer layer (21).

27. The battery device according to claim 26, characterized in that The bottom guard plate (20) further comprises a metal layer (23), wherein the metal layer (23) is arranged between the buffer layer (21) and the composite material layer (22) located on the lower side of the buffer layer (21).

28. The battery device according to claim 27, characterized in that The protective member (40) is provided on a side of the buffer layer (21) facing the metal layer (23).

29. The battery device according to claim 27, wherein: The metal layer (23) and the composite material layer (22) located on the upper side of the metal layer (23) cooperate to define a buffer cavity (231), and the buffer layer (21) is filled in the buffer cavity (231).

30. The battery device according to claim 29, wherein: The number of the buffer cavity (231) is one, or the number of the buffer cavity (231) is multiple, and the multiple buffer cavities (231) are arranged at intervals along the first direction (X).

31. The battery device according to claim 27, wherein: The metal layer (23) is a steel plate or an aluminum alloy plate; and / or the plate thickness of the metal layer (23) is greater than or equal to 0.4 mm.

32. The battery device according to claim 27, wherein: The tensile strength of the metal layer (23) is greater than or equal to 500 MPa; and / or the yield strength of the metal layer (23) is greater than or equal to 300 MPa; and / or the elongation at break of the metal layer (23) is greater than or equal to 15%.

33. The battery device according to claim 26, wherein: The composite material layer (22) is a resin fiber composite material layer (22).

34. The battery device according to claim 33, characterized in that The resin in the composite material layer (22) is a thermosetting resin or a thermoplastic polyamide; and / or the fibers in the composite material layer (22) are glass fibers, carbon fibers, ultra-high molecular weight polyethylene fibers, aramid fibers or basalt fibers.

35. The battery device according to claim 33, characterized in that The thickness of the composite material layer (22) located on the upper side of the buffer layer (21) is greater than or equal to 0.3 mm and less than or equal to 1.5 mm; and / or, The thickness of the composite material layer (22) located on the lower side of the buffer layer (21) is greater than or equal to 0.6 mm and less than or equal to 2 mm.

36. The battery device according to claim 26, wherein: The buffer layer (21) is a foam material layer or a metal honeycomb structure layer.

37. The battery device according to claim 26, wherein: The thickness of the buffer layer (21) is greater than or equal to 2 mm.

38. An electrical device, characterized in that: A battery device (100) comprising any one of claims 1-37.

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