Battery devices and power-consuming devices

Abstract

The present invention relates to the field of battery technology, and discloses a battery device and an electrical device. The battery device includes a box structure and a battery cell assembly. The box structure includes a box body and a cover body. A storage cavity is defined between the box body and the cover body. An energy absorption structure is provided on the side of the box body away from the cover body. The energy absorption structure extends along a first direction. The box body includes a box frame and a box bottom plate. The box frame is annular. The box bottom plate is provided in the box frame and connected to the box frame. The box bottom plate and the box frame jointly define a storage cavity. The energy absorption structure is provided on the side of the box bottom plate away from the storage cavity. The energy absorption structure is connected to the box frame at both ends along the first direction. The battery cell assembly is provided in the storage cavity. According to the battery device of the present invention, the box structure has high structural strength and good energy absorption effect, and does not occupy the internal space of the box body.

Description

Technical Field

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

[0002] In related technologies, when a battery device is squeezed or collided, the squeezing or collision force can impact the battery cells within the device, causing risks such as leakage, fire, or even explosion. Existing battery devices lack effective protection structures against side impacts. Some existing battery devices have energy-absorbing components, but these occupy the internal space of the battery device, resulting in limited internal space. Summary of the Invention

[0003] In view of the above problems, the present invention provides a battery device and an electric device.

[0004] In a first aspect, the present invention provides a battery device, which includes a box structure and a battery cell assembly, the box structure includes a box body and a cover, a accommodating cavity is defined between the box body and the cover, an energy absorption structure is provided on the side of the box body facing away from the cover, and the energy absorption structure extends along a first direction, the box body includes a box frame and a box bottom plate, the box frame is annular, the box bottom plate is arranged in the box frame and connected to the box frame, the box bottom plate and the box frame jointly define the accommodating cavity, the energy absorption structure is arranged on the side of the box bottom plate facing away from the accommodating cavity, and the two ends of the energy absorption structure along the first direction are respectively connected to the box frame, and the battery cell assembly is arranged in the accommodating cavity.

[0005] In the above-described technical solution, by providing an energy-absorbing structure on the side of the box bottom plate facing away from the accommodating cavity, and connecting both ends of the energy-absorbing structure along the first direction to the box frame, the structural strength and overall rigidity of the box structure can be improved, thereby enhancing the battery device's resistance to extrusion and collision along the first direction. The energy-absorbing structure also has an energy-absorbing effect, buffering collision extrusion forces and dissipating collision energy, thereby reducing the risk of thermal runaway in the battery device and improving its safety. Furthermore, the energy-absorbing structure does not occupy the internal space of the box structure, which helps increase energy density and improve the capacity of the battery device.

[0006] In some embodiments, the energy absorbing structure is tubular.

[0007] In the above technical solution, the tubular energy-absorbing structure is easy to process and manufacture, which helps improve the production and processing efficiency of the box structure. It also facilitates the energy-absorbing structure and the box body at both ends along the first direction to form an I-shaped structure, thereby achieving an energy-absorbing effect and improving the structural strength of the box structure.

[0008] In some embodiments, at least a portion of the energy absorbing structure is in the shape of a cylindrical tube or an elliptical tube.

[0009] In the above technical solution, the cylindrical or elliptical tube-shaped energy-absorbing structure has higher bending stiffness and compressive stability, which can improve energy absorption efficiency, increase the structural strength and overall stiffness of the box structure, and enhance the box structure's anti-extrusion and anti-collision capabilities along the first direction.

[0010] In some embodiments, along the first direction, the energy absorbing structure includes a first end, a middle part and a second end arranged in sequence, the two ends of the middle part are respectively connected to the first end and the second end, the middle part is a cylindrical tube or an elliptical tube, and the first end and the second end are at least flat on the surface facing the box body.

[0011] In the above technical solution, the connection difficulty between the energy-absorbing structure and the box body can be reduced, thereby improving the assembly efficiency of the box structure. It can also enhance the connection stability between the box body and the energy-absorbing structure, thereby improving the structural stability and strength of the box structure.

[0012] In some embodiments, the maximum thickness of the first end portion along the height direction of the box structure is smaller than the maximum thickness of the middle portion along the height direction of the box structure; and / or, the maximum thickness of the second end portion along the height direction of the box structure is smaller than the maximum thickness of the middle portion along the height direction of the box structure.

[0013] In the above technical solution, while ensuring the structural strength and energy absorption effect of the energy absorption structure, the difficulty of connecting the energy absorption structure with the box body can be reduced, and it is also beneficial to expand the connection method between the energy absorption structure and the box body, thereby improving the assembly efficiency of the box structure.

[0014] In some embodiments, the maximum thickness of the first end along the height direction of the box structure is smaller than the maximum thickness of the first end along the second direction; and / or the maximum thickness of the second end along the height direction of the box structure is smaller than the maximum thickness of the second end along the second direction, wherein the first direction and the second direction are perpendicular to the height direction of the box structure.

[0015] In the above technical solution, the difficulty of connecting the second end portion to the box body can be reduced, and it is also beneficial to expand the connection methods between the energy absorbing structure and the box body, thereby improving the assembly efficiency of the box structure.

[0016] In some embodiments, there are multiple energy absorbing structures, and the multiple energy absorbing structures are spaced apart along the second direction, wherein the first direction and the second direction are perpendicular to the height direction of the box structure in pairs.

[0017] In the above technical solution, multiple energy-absorbing structures can further enhance the structural strength and overall rigidity of the box structure, improve the buffering and dispersion of impact forces, and further enhance the safety of the battery device. The multiple energy-absorbing structures work together to reduce local stress concentrations. If one energy-absorbing structure fails, the others can continue to function, improving the energy-absorbing stability of the box structure.

[0018] In some embodiments, the box frame includes a first plate and a second plate, the first plate extends along the height direction of the box structure, the first plate is annular, and the box bottom plate is arranged on the inner side of the first plate; the second plate is connected to the inner peripheral wall of the first plate, and the second plate extends in the horizontal direction toward the side away from the first plate, the second plate is arranged on the side of the box bottom plate away from the accommodating cavity and is connected to the box bottom plate, and the energy absorption structure is connected to the second plate at both ends along the first direction.

[0019] In the above technical solution, the box frame is divided into a first plate and a second plate. This simplifies the connection between the box frame and the box bottom plate, as well as the connection between the energy-absorbing structure and the box body, thereby improving the assembly efficiency of the box structure. It also enhances the stability of the connection between the box bottom plate and the box frame, as well as the connection between the energy-absorbing structure and the box body, thereby improving the structural stability and strength of the box body and the box structure.

[0020] In some embodiments, the energy absorbing structure is connected to the box body by riveting, clamping or welding.

[0021] In the above technical solution, the connection stability between the energy absorbing structure and the box body can be improved, and the production efficiency can be improved at the same time.

[0022] In some embodiments, the energy absorbing structure is a steel part or an aluminum part.

[0023] In the above technical solution, the energy absorbing structure is made of steel, which can improve the structural strength and impact resistance of the energy absorbing structure, and is conducive to achieving the energy absorbing effect of the energy absorbing structure. The energy absorbing structure is made of aluminum, which can achieve lightweight and can better improve the energy absorbing efficiency of the energy absorbing structure.

[0024] In some embodiments, a collapse groove is provided on the outer peripheral wall of the energy absorbing structure, and a plurality of the collapse grooves are spaced apart along the first direction.

[0025] In the above technical solution, the energy-absorbing structure can be deformed in a controlled manner, thereby achieving precise energy absorption. Multiple crush grooves can achieve phased energy absorption, thereby extending the energy absorption time, buffering and dispersing the impact force, and improving the energy absorption effect of the energy-absorbing structure.

[0026] In some embodiments, the energy absorbing structure has a cavity therein, and the cavity extends along the first direction.

[0027] In the above technical solution, a cavity is provided in the energy absorbing structure, which can enhance the energy absorbing effect of the energy absorbing structure, thereby better buffering the collision extrusion force and consuming the collision energy, and can also reduce the weight of the energy absorbing structure and reduce the cost.

[0028] In some embodiments, along the height direction of the box structure, an avoidance groove is provided on the side wall of the accommodating cavity away from the cover body, and the battery device further includes a water cooling pipe, which is provided in the avoidance groove.

[0029] In the above technical solution, the heat dissipation efficiency of the battery cell assembly can be improved and the service life of the battery cell assembly can be extended. The design of the avoidance groove can improve the space utilization rate in the box body and is also conducive to improving the energy density of the battery device.

[0030] In some embodiments, a convex rib opposite to the avoidance groove is provided on a side of the box body facing away from the accommodating cavity along the height direction of the box structure.

[0031] In the above technical solution, the space occupied by the water-cooling tube in the accommodating cavity can be better reduced, the space utilization rate in the box body can be further improved, and the energy density of the battery device can be improved.

[0032] In some embodiments, along the first direction, the energy absorbing structure includes a first end, a first gradient portion, a middle portion, a second gradient portion and a second end connected in sequence, at least a portion of the middle portion abuts against the rib, the first end, the middle portion and the second end all extend along the first direction, and in the direction from the middle portion to the first end, the first gradient portion is inclined toward the direction close to the box body, and in the direction from the middle portion to the second end, the second gradient portion is inclined toward the direction close to the box body.

[0033] In the above technical solution, the energy-absorbing structure can adapt to the box body structure, making installation more convenient and the structural design more reasonable. This can reduce the difficulty of connecting the energy-absorbing structure to the box body, thereby improving the assembly efficiency of the box structure. It can also enhance the stability of the connection between the box body and the energy-absorbing structure, thereby improving the structural stability and strength of the box structure.

[0034] In a second aspect, the present invention provides an electrical device, comprising: a battery device according to an embodiment of the first aspect of the present invention.

[0035] In the above technical solution, the battery cell assembly is positioned within the accommodating cavity, and an energy-absorbing structure is provided on the outer bottom wall of the box body. The energy-absorbing structure's two ends along a first direction are respectively connected to the two ends of the box body along the first direction. This improves the structural strength and overall rigidity of the box structure, enhancing the battery assembly's resistance to extrusion and collision in the first direction. The energy-absorbing structure also has an energy-absorbing effect, buffering collision extrusion forces and dissipating collision energy, thereby reducing the risk of thermal runaway in the battery assembly and improving the safety of the electrical device. Furthermore, the energy-absorbing structure does not occupy the internal space of the box body, which helps increase energy density and improve the capacity of the battery assembly.

[0036] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0038] Figure 1 is a bottom view of a box structure of a battery device according to some embodiments of the present invention;

[0039] Figure 2 is a perspective view of a box structure of a battery device according to some embodiments of the present invention;

[0040] Figure 3 is a top view of a box structure of a battery device according to some embodiments of the present invention;

[0041] Figure 4 It is along Figure 3 Cross-sectional view along line AA;

[0042] Figure 5 yes Figure 4 Enlarged view of point B in the middle;

[0043] Figure 6 yes Figure 4 Enlarged view of point C in the middle;

[0044] Figure 7 is a structural diagram of a battery device according to some embodiments of the present invention, wherein a cover is not shown;

[0045] Figure 8 is a schematic diagram of a battery device according to some embodiments of the present invention;

[0046] Figure 9 is a schematic diagram of an electrical device according to some embodiments of the present invention.

[0047] Reference numerals:

[0048] 1000. Electrical devices;

[0049] 100. Battery device;

[0050] 10. Box structure;

[0051] 1. Box body; 11. Accommodation cavity; 12. Box frame; 121. First plate; 1211. Energy absorption cavity; 122. Second plate; 13. Box bottom plate; 14. Avoidance groove; 15. Raised rib;

[0052] 2. Energy absorbing structure; 21. First end portion; 22. Middle portion; 23. Second end portion; 24. First transition portion; 25. Second transition portion;

[0053] e1, first direction; e2, second direction; e3, height direction of the box structure;

[0054] 20. Battery monomer assembly;

[0055] 30. Water cooling pipe. DETAILED DESCRIPTION

[0056] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0057] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meanings as commonly understood by those skilled in the art to which the present invention pertains. The terms used in the specification and application of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The terms "including" and "having," as well as any variations thereof, in the specification and claims of the present invention and the accompanying drawings are intended to cover non-exclusive inclusions. The terms "first," "second," etc., in the specification and claims of the present invention and the accompanying drawings are used to distinguish between different objects, rather than to describe a specific order or a primary-secondary relationship.

[0058] Reference to an "embodiment" in the present invention means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present invention. 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.

[0059] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0060] The term "and / or" in this disclosure simply describes an association between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this disclosure generally indicates that the related objects are in an "or" relationship.

[0061] In the embodiments of the present invention, identical reference numerals denote identical components, and for the sake of brevity, detailed descriptions of identical components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of the present invention, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings, are merely illustrative and do not constitute any limitation on the present invention.

[0062] The term “plurality” used in the present invention refers to two or more (including two).

[0063] In the embodiments of the present invention, unless otherwise specified, all embodiments and optional embodiments of the present invention can be combined with each other to form a new technical solution.

[0064] In the embodiments of the present invention, unless otherwise specified, all technical features and optional technical features of the present invention can be combined with each other to form a new technical solution.

[0065] In embodiments of the present invention, a battery apparatus may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or parallel via a busbar. For example, a battery cell assembly is typically formed by arranging multiple battery cells; a battery cell assembly may be a battery module, which is 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.

[0066] The battery device may be a battery pack, which includes a housing and one or more battery cell assemblies housed within the housing. The battery cell assemblies may be battery modules, which may be housed within the housing by securing the battery module within the housing. Alternatively, the battery cell assembly may be housed within the housing by directly securing multiple battery cells to the housing.

[0067] In an embodiment of the present invention, 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 accommodate the battery cell assembly. Enclosed herein means covered or closed, and may be sealed or unsealed. The first housing may be a top cover or a bottom plate. For example, the housing may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame to form an enclosed space within the housing to accommodate the battery cell assembly.

[0068] In an embodiment of the present invention, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0069] In the embodiments of the present invention, the battery cells may be secondary batteries, which are defined as batteries that can be recharged after discharge to activate the active material and continue to be used. The battery cells may be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, and the like, although the embodiments of the present invention do not limit this. The battery cells may be cylindrical, flat, rectangular, or in other shapes, although the embodiments of the present invention do not limit this. Battery cells are generally categorized into three types based on packaging: cylindrical, prismatic, and soft-pack. The embodiments of the present invention do not limit this either.

[0070] Currently, market developments indicate that batteries are increasingly being used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. As the application of power batteries continues to expand, market demand is also growing.

[0071] In related technologies, when a battery device is squeezed or collided, the squeezing or collision force can impact the battery cells within the device, causing risks such as leakage, fire, or even explosion. Existing battery devices lack effective protection against side impacts. Some devices incorporate energy-absorbing components, but these occupy the internal space of the battery device, limiting its internal space.

[0072] Based on this, the present invention proposes a battery device, which includes a box structure and a battery cell assembly. The box structure includes a box body and a cover body. A accommodating cavity is defined between the box body and the cover body. An energy absorption structure is provided on the side of the box body facing away from the cover body. The energy absorption structure extends along a first direction. The box body includes a box frame and a box bottom plate. The box frame is annular. The box bottom plate is arranged in the box frame and connected to the box frame. The box bottom plate and the box frame jointly define a accommodating cavity. The energy absorption structure is arranged on the side of the box bottom plate facing away from the accommodating cavity. The two ends of the energy absorption structure along the first direction are respectively connected to the box frame. The battery cell assembly is arranged in the accommodating cavity.

[0073] In this battery device, an energy-absorbing structure is provided on the side of the bottom plate of the housing facing away from the accommodating cavity, with both ends of the energy-absorbing structure connected to the housing frame along a first direction. This improves the structural strength and overall rigidity of the housing structure, enhancing the battery device's resistance to extrusion and collision along the first direction. The energy-absorbing structure also absorbs energy, buffering collision forces and dissipating collision energy, thereby reducing the risk of thermal runaway in the battery device and improving its safety. Furthermore, the energy-absorbing structure does not occupy the internal space of the housing structure, which helps increase energy density and improve the capacity of the battery device.

[0074] The battery device disclosed in the embodiments of the present invention can be used in electrical equipment that uses the battery device as a power source or various energy storage systems that use the battery device as an energy storage element. In addition to being used in vehicles, the battery device can also be used in, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, battery-powered vehicles, electric cars, ships, spacecraft, and the like. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, and the like.

[0075] The power-consuming device disclosed in the embodiments of the present invention may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device is provided inside the vehicle, and the battery device may be provided at the bottom, head or tail of the vehicle. The battery device may be used to power the vehicle, for example, the battery device may serve as an operating power source for the vehicle. The vehicle may further include a controller and a motor, and the controller is used to control the battery device to power the motor, for example, for the starting, navigation and working power requirements of the vehicle during driving. In some embodiments of the present invention, the battery device may serve not only as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0076] Reference below Figures 1-9 A battery device 100 according to an embodiment of the present invention is described.

[0077] refer to Figure 1 、 Figure 2 and Figure 3 , combined with Figure 7 and Figure 8 In a first aspect, the present invention provides a battery device 100, which includes a box structure 10 and a battery cell assembly 20. The box structure 10 includes a box body 1 and a cover body. A accommodating cavity 11 is defined between the box body 1 and the cover body. An energy absorbing structure 2 is provided on the side of the box body 1 facing away from the cover body. The energy absorbing structure 2 extends along a first direction e1, and the two ends of the energy absorbing structure 2 along the first direction e1 are respectively connected to the two ends of the box body 1 along the first direction e1. The battery cell assembly 20 is arranged in the accommodating cavity 11.

[0078] The box body 1 includes a box frame 12 and a box bottom plate 13. The box frame 12 is annular. The box bottom plate 13 is arranged in the box frame 12 and is connected to the box frame 12. The box bottom plate 13 and the box frame 12 jointly define a accommodating cavity 11. The energy absorbing structure 2 is arranged on the side of the box bottom plate 13 away from the accommodating cavity 11, and the two ends of the energy absorbing structure 2 along the first direction e1 are respectively connected to the box frame 12.

[0079] The box structure 10 plays a role of structural support and protection, and can resist external force impacts such as collision, extrusion, and puncture, thereby protecting the components in the accommodating cavity 11, such as reducing problems such as internal short circuit or electrolyte leakage of the battery cell assembly 20.

[0080] The box frame 12 is arranged around the box bottom plate 13 and is connected to the box bottom plate 13, dividing the box body 1 into the box frame 12 and the box bottom plate 13, which makes it convenient to process the box frame 12 and the box bottom plate 13 separately and then assemble them into the box body 1, which can reduce the production and processing difficulty of the box body 1, thereby helping to improve production efficiency.

[0081] The box frame 12 can be enclosed to form a rectangle, so that the accommodating cavity 11 is formed into a rectangular space, which is convenient for placing components such as the battery cell assembly 20.

[0082] An energy absorbing structure 2 is provided on the side of the box body 1 away from the cover body. For example, the energy absorbing structure 2 can be provided on the outer bottom wall of the box body 1. The energy absorbing structure 2 is provided along the first direction e1 (eg Figure 2 The energy-absorbing structure 2 extends in the direction e1 shown in the figure. The energy-absorbing structure 2 is connected to the box frame 12 at both ends along the first direction e1. Thus, the energy-absorbing structure 2 and the box body 1 at both ends along the first direction e1 form an I-shaped structure. This significantly improves the structural strength and overall rigidity of the box structure 10, enhancing its anti-extrusion and anti-collision capabilities along the first direction e1, allowing the battery device 100 to better withstand greater impact or collision forces along the first direction e1.

[0083] The energy-absorbing structure 2 also has an energy-absorbing effect. When the box structure 10 is impacted along the first direction e1, the box frame 12 is impacted first. The box frame 12 then directly transmits the impact force to the energy-absorbing structure 2, which acts as a buffer and disperser. The box body 1 can transfer at least part of the impact force to the energy-absorbing structure 2, buffering the impact force and dissipating the collision energy, thereby reducing the impact of the large acceleration that may be caused by the collision on components such as the battery cell assembly 20.

[0084] When the box body 1 collides and is squeezed in the first direction e1, the risk of the collision force being directly transmitted to the battery cell assembly 20 and other components causing damage can be effectively reduced, thereby reducing the risk of thermal runaway of the battery device 100 and improving the safety of the battery device 100.

[0085] Furthermore, the energy-absorbing structure 2 is disposed outside the box structure 10, thereby improving structural strength and energy absorption while not occupying the internal space of the box structure 10, effectively alleviating the problem of limited internal space of the box structure 10. Furthermore, the internal space of the box structure 10 is freed up to accommodate more battery cell assemblies 20 or to increase the size of the battery cell assemblies 20, thereby increasing the energy density and improving the capacity of the battery device 100.

[0086] It should be noted that when the battery device 100 is used in a vehicle, the first direction e1 can be the left and right direction of the driver when the vehicle is driving. From the perspective of the installation structure of the battery device 100 in the vehicle, the vehicle body design itself will strengthen the body structure in the front and rear directions to reduce the impact on the battery device 100 when the vehicle is hit from the front or rear. However, due to space limitations and other reasons, there is no good protective structure in the left and right directions of the vehicle. Therefore, the box structure 10 of the present application can be used for the situation of vehicle side collision. When the vehicle is hit by a severe side collision, the energy-absorbing structure 2 can improve the resistance to impact and absorb and disperse the collision energy, thereby protecting the battery device 100 and internal components such as the battery cell assembly 20, reducing the probability of leakage, fire, or even explosion of the battery device 100, and improving the safety performance of the battery device 100 and the vehicle.

[0087] It should be noted that the first direction e1 may also be the front-rear direction of the driver when the vehicle is traveling. When the vehicle is hit from the front or rear, the energy-absorbing structure may protect the battery cell assembly 20 and improve the safety performance of the battery device 100 and the vehicle.

[0088] In the above-described technical solution, by disposing an energy-absorbing structure 2 on the side of the box bottom plate 13 facing away from the accommodating cavity 11, and connecting both ends of the energy-absorbing structure 2 along the first direction e1 to the box frame 12, the structural strength and overall rigidity of the box structure 10 can be improved, thereby enhancing the battery device 100's anti-extrusion and anti-collision capabilities along the first direction e1. The energy-absorbing structure 2 also has an energy-absorbing effect, buffering collision extrusion forces and dissipating collision energy, thereby reducing the risk of thermal runaway in the battery device 100 and improving its safety. Furthermore, the energy-absorbing structure 2 does not occupy the internal space of the box structure 10, which helps increase the energy density and capacity of the battery device 100.

[0089] In some embodiments, reference Figure 1 , the energy absorbing structure 2 is tubular.

[0090] The energy-absorbing structure 2 is a tubular structure extending along the first direction e1. This allows the energy-absorbing structure 2 and the box body 1 to form an I-shaped structure at both ends along the first direction e1, thereby achieving an energy-absorbing effect and improving the structural strength of the box structure 10. The tubular energy-absorbing structure 2 facilitates processing and production, thereby improving the production and processing efficiency of the box structure 10.

[0091] It should be noted that the energy-absorbing structure 2 can be a solid tubular structure, which is beneficial for improving the structural strength and overall rigidity of the box structure 10, further enhancing the box structure 10's anti-extrusion and anti-collision capabilities along the first direction e1. Of course, the energy-absorbing structure 2 can also be a hollow tubular structure, which can enhance the energy-absorbing effect of the energy-absorbing structure 2, thereby better buffering the collision extrusion force and absorbing the collision energy, and can also reduce the weight of the energy-absorbing structure 2 and reduce the cost.

[0092] In the above technical solution, the tubular energy-absorbing structure 2 is easy to process and manufacture, which helps improve the production and processing efficiency of the box structure 10. It also facilitates the energy-absorbing structure 2 and the box body 1 to form an I-shaped structure at both ends along the first direction e1, thereby achieving an energy-absorbing effect and improving the structural strength of the box structure 10.

[0093] In some embodiments, reference Figure 1 and Figure 5 At least part of the energy absorbing structure 2 is in the shape of a cylindrical tube or an elliptical tube.

[0094] Compared to other tubular shapes, cylindrical or elliptical tubular shapes offer greater bending stiffness and compressive stability, improving energy absorption efficiency. The uniform distribution of moment of inertia in all directions across a circular or elliptical cross-section enhances the energy-absorbing structure 2's resistance to bending and torsion, thereby increasing the structural strength and overall rigidity of the box structure 10 and enhancing its resistance to extrusion and collision along the first direction e1.

[0095] In the above technical solution, the cylindrical or elliptical tubular energy-absorbing structure 2 has higher bending stiffness and compressive stability, which can improve energy absorption efficiency, increase the structural strength and overall stiffness of the box structure 10, and enhance the box structure 10's anti-extrusion and anti-collision capabilities along the first direction e1.

[0096] In some embodiments, reference Figure 4 、 Figure 5 and Figure 6 Along the first direction e1, the energy absorbing structure 2 includes a first end portion 21, a middle portion 22 and a second end portion 23 arranged in sequence, and the two ends of the middle portion 22 are respectively connected to the first end portion 21 and the second end portion 23. The middle portion 22 is a cylindrical tube or an elliptical tube, and the first end portion 21 and the second end portion 23 are at least flat surfaces facing the box body 1.

[0097] Forming the middle portion 22 into a cylindrical tube shape or an elliptical tube shape can enhance the ability of the energy-absorbing structure 2 to resist bending and torsion, thereby improving the structural strength and overall rigidity of the box structure 10 .

[0098] The first end portion 21 and the second end portion 23 are respectively provided at the two ends of the middle portion 22. The energy-absorbing structure 2 is connected to the box body 1 via the first end portion 21 and the second end portion 23. Therefore, by configuring at least the surfaces of the first end portion 21 and the second end portion 23 facing the box body 1 as planes, the connection difficulty of the energy-absorbing structure 2 to the box body 1 can be reduced, thereby facilitating improved assembly efficiency of the box structure 10. The surfaces of the first end portion 21 and the second end that abut the box body 1 are planes, which can increase the contact area between the box body 1 and the energy-absorbing structure 2, thereby enhancing the connection stability between the box body 1 and the energy-absorbing structure 2, and thereby improving the structural stability and strength of the box structure 10.

[0099] The first end 21 and the second end 23 can be flat, and the surface of the first end 21 facing the box body 1 and the surface away from the box body 1 are both planar and substantially parallel, and the surface of the second end 23 facing the box body 1 and the surface away from the box body 1 are both planar and substantially parallel, thereby further reducing the difficulty of connecting the energy-absorbing structure 2 and the box body 1, thereby improving assembly efficiency and enhancing connection stability.

[0100] In the specific production process, the energy-absorbing structure 2 can be first constructed as a cylindrical or elliptical tube, and then the installation areas at both ends of the energy-absorbing structure 2 in the longitudinal direction are pressed into a flat shape, thereby forming the first end portion 21, the middle portion 22, and the second end portion 23. The above production and processing methods are merely illustrative, and this application does not specifically limit the processing and production methods of the energy-absorbing structure 2.

[0101] In the above technical solution, the connection difficulty between the energy absorbing structure 2 and the box body 1 can be reduced, thereby improving the assembly efficiency of the box structure 10. The connection stability between the box body 1 and the energy absorbing structure 2 can also be enhanced, thereby improving the structural stability and strength of the box structure 10.

[0102] In some embodiments, reference Figure 1 and Figure 5 The maximum thickness of the first end portion 21 along the height direction e3 of the box structure 10 is smaller than the maximum thickness of the middle portion 22 along the height direction e3 of the box structure 10 .

[0103] That is, compared to the middle portion 22, the first end portion 21 has a smaller thickness along the height direction e3 of the box structure 10, making it easier to connect the first end portion 21 to the box body 1 through methods such as riveting or screwing. This reduces the difficulty of connecting the energy-absorbing structure 2 to the box body 1 and helps expand the connection methods of the energy-absorbing structure 2 to the box body 1, thereby improving the assembly efficiency of the box structure 10. The middle portion 22 has a greater thickness along the height direction e3 of the box structure 10 than the first end portion 21, ensuring the structural strength and energy absorption effect of the energy-absorbing structure 2.

[0104] It should be noted that the height direction e3 of the box structure 10 is as follows: Figure 2 and Figure 4 As shown, when the battery device 100 is applied to a vehicle and the box bottom plate 13 is arranged horizontally, the height direction e3 of the box structure 10 is the up-down direction.

[0105] In the above technical solution, while ensuring the structural strength and energy absorption effect of the energy absorption structure 2, the difficulty of connecting the first end 21 with the box body 1 can be reduced, and it is also beneficial to expand the connection method between the energy absorption structure 2 and the box body 1, thereby improving the assembly efficiency of the box structure 10.

[0106] In some embodiments, reference Figure 1 and Figure 6 The maximum thickness of the second end portion 23 along the height direction e3 of the box structure 10 is smaller than the maximum thickness of the middle portion 22 along the height direction e3 of the box structure 10 .

[0107] That is, compared to the middle portion 22, the second end portion 23 has a smaller thickness along the height direction e3 of the box structure 10, making it easier to connect the second end portion 23 to the box body 1 through methods such as riveting or screwing. This reduces the difficulty of connecting the energy-absorbing structure 2 to the box body 1 and helps expand the connection methods of the energy-absorbing structure 2 to the box body 1, thereby improving the assembly efficiency of the box structure 10. The middle portion 22 has a greater thickness along the height direction e3 of the box structure 10 than the second end portion 23, ensuring the structural strength and energy absorption effect of the energy-absorbing structure 2.

[0108] In the above technical solution, while ensuring the structural strength and energy absorption effect of the energy absorption structure 2, the difficulty of connecting the second end 23 with the box body 1 can be reduced, and it is also beneficial to expand the connection method between the energy absorption structure 2 and the box body 1, thereby improving the assembly efficiency of the box structure 10.

[0109] In some embodiments, reference Figure 1 and Figure 5 The maximum thickness of the first end portion 21 along the height direction e3 of the box structure 10 is smaller than the maximum thickness of the first end portion 21 along the second direction e2, wherein the first direction e1 and the second direction e2 are perpendicular to the height direction e3 of the box structure 10.

[0110] The first end portion 21 is a flat structure, which facilitates setting the two surfaces of the first end portion 21 along the height direction e3 of the box structure 10 as planes, thereby facilitating connecting the first end portion 21 to the box body 1 by means of riveting, screwing, etc., which can reduce the difficulty of connecting the energy-absorbing structure 2 and the box body 1, and is also conducive to expanding the connection method between the energy-absorbing structure 2 and the box body 1, thereby improving the assembly efficiency of the box structure 10.

[0111] In the above technical solution, the difficulty of connecting the first end portion 21 with the box body 1 can be reduced, and it is also beneficial to expand the connection mode between the energy absorbing structure 2 and the box body 1, thereby improving the assembly efficiency of the box structure 10.

[0112] In some embodiments, reference Figure 1 and Figure 6 The maximum thickness of the second end 23 along the height direction e3 of the box structure 10 is smaller than the maximum thickness of the second end 23 along the second direction e2, wherein the first direction e1 and the second direction e2 are perpendicular to the height direction e3 of the box structure 10.

[0113] The second end portion 23 is a flat structure, which facilitates setting the two surfaces of the second end portion 23 along the height direction e3 of the box structure 10 as planes, thereby facilitating connecting the second end portion 23 to the box body 1 by means of riveting, screwing, etc., which can reduce the difficulty of connecting the energy-absorbing structure 2 and the box body 1, and is also conducive to expanding the connection method between the energy-absorbing structure 2 and the box body 1, thereby improving the assembly efficiency of the box structure 10.

[0114] In the above technical solution, the difficulty of connecting the second end portion 23 with the box body 1 can be reduced, and it is also beneficial to expand the connection mode between the energy absorbing structure 2 and the box body 1, thereby improving the assembly efficiency of the box structure 10.

[0115] In some embodiments, reference Figure 1There are multiple energy absorbing structures 2, and the multiple energy absorbing structures 2 are spaced apart along the second direction e2, wherein the first direction e1, the second direction e2 and the height direction e3 of the box structure 10 are perpendicular to each other.

[0116] The second direction e2 is perpendicular to the height direction e3 of the box structure 10. Figure 2 The direction e2 shown, the height direction e3 of the box structure 10 is as shown Figure 2 The e3 direction is shown.

[0117] Multiple energy-absorbing structures 2 can form multiple I-shaped structures, which can further improve the structural strength and overall rigidity of the box structure 10, enhance the anti-extrusion and anti-collision capabilities of the box structure 10 along the first direction e1, and enable the battery device 100 to better resist greater impact force or collision force along the first direction e1.

[0118] When the box structure 10 is impacted along the first direction e1, multiple energy-absorbing structures 2 can simultaneously achieve energy absorption effects at multiple locations along the second direction e2, thereby improving the buffering and dispersion of the impact force, further reducing the risk of damage caused by the collision force being directly transmitted to components such as the battery cell assembly 20 in the accommodating cavity 11, and further improving the safety of the battery device 100.

[0119] The multiple energy absorbing structures 2 work together to reduce local stress concentration, which is beneficial to extending the service life of the box structure 10. When one energy absorbing structure 2 fails, the other energy absorbing structures 2 can continue to work, thereby improving the energy absorption stability of the box structure 10.

[0120] In the above technical solution, the multiple energy-absorbing structures 2 can further enhance the structural strength and overall rigidity of the box structure 10, improve the buffering and dispersion of impact forces, and further enhance the safety of the battery device 100. The multiple energy-absorbing structures 2 work in tandem to reduce local stress concentration. If one energy-absorbing structure 2 fails, the remaining energy-absorbing structures 2 can continue to function, thereby improving the energy absorption stability of the box structure 10.

[0121] In some embodiments, reference Figure 4 、 Figure 5 and Figure 6The box frame 12 includes a first plate 121 and a second plate 122. The first plate 121 extends along the height direction e3 of the box structure 10. The first plate 121 is annular. The box bottom plate 13 is arranged on the inner side of the first plate 121. The second plate 122 is connected to the inner peripheral wall of the first plate 121. The second plate 122 extends horizontally toward the side away from the first plate 121. The second plate 122 is arranged on the side of the box bottom plate 13 away from the accommodating cavity 11 and is connected to the box bottom plate 13. The energy absorbing structure 2 is connected to the second plate 122 at both ends along the first direction e1.

[0122] The first plate 121 is disposed around the bottom plate 13 and defines the accommodating cavity 11 with the bottom plate 13. The second plate 122 is connected to the end of the first plate 121 that is closest to the bottom plate 13. The second plate 122 is disposed on the outer bottom wall of the bottom plate 13 to facilitate connection between the second plate 122 and the bottom plate 13. Dividing the box frame 12 into the first plate 121 and the second plate 122 can reduce the difficulty of connecting the box frame 12 to the bottom plate 13, as well as reducing the difficulty of connecting the energy-absorbing structure 2 to the box body 1, thereby improving the assembly efficiency of the box structure 10.

[0123] The second plate 122 is parallel to and completely in contact with the box bottom plate 13, thereby increasing the contact area between the box bottom plate 13 and the box frame 12, thereby enhancing the connection stability between the box bottom plate 13 and the box frame 12, and further improving the structural stability and strength of the box body 1. The second plate 122 also increases the contact area with the energy-absorbing structure 2, thereby enhancing the connection stability between the energy-absorbing structure 2 and the box body 1, and improving the structural stability and strength of the box structure 10.

[0124] In the above technical solution, the box frame 12 is divided into the first plate 121 and the second plate 122. This can reduce the difficulty of connecting the box frame 12 to the box bottom plate 13, as well as reducing the difficulty of connecting the energy-absorbing structure 2 to the box body 1, thereby improving the assembly efficiency of the box structure 10. It can also enhance the stability of the connection between the box bottom plate 13 and the box frame 12, as well as the stability of the connection between the energy-absorbing structure 2 and the box body 1, thereby improving the structural stability and strength of the box body 1 and the box structure 10.

[0125] In some embodiments, as Figure 5 and Figure 6 In the example shown, a hollow energy absorbing cavity 1211 is provided inside the first plate 121 .

[0126] The energy absorption cavity 1211 can improve the energy absorption effect of the first plate 121. When the box structure 10 is impacted by external force, the first plate 121 first collapses and deforms to absorb energy, thereby buffering the collision extrusion force, consuming the collision energy, and reducing the impact force transmitted from the first plate 121 to the second plate 122 and the box bottom plate 13, which can further improve the energy absorption effect of the box structure 10 and improve the safety of the battery device 100.

[0127] In the above technical solution, the energy absorption effect of the first plate 121 can be improved, thereby further improving the energy absorption effect of the box structure 10 and improving the safety of the battery device 100.

[0128] In some embodiments, the energy absorbing structure 2 is connected to the box body 1 by riveting, clamping or welding.

[0129] The energy-absorbing structure 2 can be riveted to the box body 1, for example, using rivets. The rivets are passed through the energy-absorbing structure 2 and the box body 1, and then deformed at the end of the rivets (e.g., by hammering or press riveting) to form a permanent mechanical lock. This improves the stability of the connection between the energy-absorbing structure 2 and the box body 1, and increases production efficiency.

[0130] The energy-absorbing structure 2 can be snap-connected to the box body 1, using structures such as hooks and slots to achieve rapid locking through elastic deformation, ensuring a stable connection between the energy-absorbing structure 2 and the box body 1. The snap-connection is convenient and quick, requiring no additional fasteners, and resulting in high assembly efficiency. Furthermore, the energy-absorbing structure 2 and the box body 1 can be detachably connected, facilitating later disassembly, maintenance, or replacement.

[0131] The energy absorbing structure 2 can be connected to the box body 1 by welding. The welding connection technology is mature and low-cost, which can improve the connection stability between the energy absorbing structure 2 and the box body 1 and has high processing efficiency.

[0132] In the above technical solution, the connection stability between the energy absorbing structure 2 and the box body 1 can be improved, and the production efficiency can be improved at the same time.

[0133] In some embodiments, the energy absorbing structure 2 is a steel or aluminum member.

[0134] Steel parts have strong impact resistance and high yield strength. Steel parts can absorb a large amount of kinetic energy through plastic deformation during a collision and are suitable for resisting extreme impacts. The energy-absorbing structure 2 uses steel parts, which can improve the structural strength and impact resistance of the energy-absorbing structure 2 and is also conducive to achieving the energy-absorbing effect of the energy-absorbing structure 2.

[0135] Aluminum components offer the advantages of lightweight and low density, which helps reduce the weight of energy-absorbing structure 2 and achieve a lightweight box structure 10. Aluminum components are more susceptible to ductile deformation during a collision, which can further improve the energy absorption efficiency of energy-absorbing structure 2. Furthermore, specially treated aluminum components can effectively enhance the structural strength of energy-absorbing structure 2. For example, heat treatment increases the strength of aluminum alloys, thereby enhancing the structural strength of energy-absorbing structure 2.

[0136] In the above technical solution, the energy absorbing structure 2 is made of steel, which can improve the structural strength and impact resistance of the energy absorbing structure 2 and facilitate the energy absorption effect of the energy absorbing structure 2. The energy absorbing structure 2 is made of aluminum, which can achieve lightweight and better improve the energy absorption efficiency of the energy absorbing structure 2.

[0137] In some embodiments, a collapse groove is provided on the outer peripheral wall of the energy absorbing structure 2 , and a plurality of collapse grooves are arranged at intervals along the first direction e1 .

[0138] The crush grooves provided on the energy-absorbing structure 2 enable controlled deformation, resulting in precise energy absorption. The crush grooves act as stress concentration points. When the box structure 10 is impacted, the energy-absorbing structure 2 preferentially collapses at the crush grooves, creating an energy-absorbing effect. This reduces the risk of unpredictable random deformation of the energy-absorbing structure 2, such as damage to the box body 1 and subsequent impact on internal components.

[0139] The energy absorbing structure 2 is provided with multiple collapse grooves, which can realize phased energy absorption, thereby improving the energy absorption effect. When the box structure 10 is impacted, the energy absorbing structure 2 is gradually crushed, which can prolong the energy absorption time, cushion and disperse the impact force.

[0140] In the above technical solution, the energy-absorbing structure 2 can be deformed in a controlled manner, thereby achieving precise energy absorption. Multiple crush grooves can achieve phased energy absorption, thereby extending the energy absorption time, buffering and dispersing the impact force, and improving the energy absorption effect of the energy-absorbing structure 2.

[0141] In some embodiments, the energy absorbing structure 2 has a cavity therein, and the cavity extends along the first direction e1.

[0142] The cavity can enhance the energy absorbing effect of the energy absorbing structure 2, thereby better buffering the collision extrusion force and consuming the collision energy, and can also reduce the weight of the energy absorbing structure 2 and reduce the cost.

[0143] In the above technical solution, a cavity is provided in the energy absorbing structure 2, which can enhance the energy absorbing effect of the energy absorbing structure 2, thereby better buffering the collision extrusion force and consuming the collision energy, and can also reduce the weight of the energy absorbing structure 2 and reduce the cost.

[0144] In some embodiments, reference Figure 2 and Figure 3Along the height direction e3 of the box structure 10 , an avoidance groove 14 is provided on the wall surface of the accommodating cavity 11 on the side away from the cover body. The battery device 100 also includes a water cooling pipe 30 , which is provided in the avoidance groove 14 .

[0145] The water-cooling tube 30 is attached to the side of the battery cell assembly 20 facing away from the cover. Coolant flows through the water-cooling tube 30, absorbing heat from the battery cell assembly 20 and improving heat dissipation efficiency. This maintains the battery cell assembly 20 within a suitable operating temperature range, reduces capacity decay and thermal runaway caused by high temperatures, and helps extend the service life of the battery cell assembly 20.

[0146] The design of the avoidance groove 14 can reduce the problem of the water-cooling pipe 30 occupying the layout space of the accommodating chamber 11 , thereby improving the space utilization rate in the box body 1 and also facilitating the improvement of the energy density of the battery device 100 .

[0147] In the above technical solution, the heat dissipation efficiency of the battery cell assembly 20 can be improved and the service life of the battery cell assembly 20 can be extended. The design of the avoidance groove 14 can improve the space utilization rate in the box body 1 and is also conducive to improving the energy density of the battery device 100.

[0148] In some embodiments, reference Figure 1 and Figure 6 The box body 1 is provided with a rib 15 opposite to the avoidance groove 14 on a side away from the accommodating cavity 11 along the height direction e3 of the box structure 10.

[0149] In this way, the depth of the avoidance groove 14 can be increased, so that most of the water-cooling tubes 30 or even all of the water-cooling tubes 30 can be arranged in the avoidance groove 14, thereby better reducing the space occupied by the water-cooling tubes 30 in the accommodating cavity 11, further improving the space utilization rate in the box body 1, and also helping to improve the energy density of the battery device 100.

[0150] In the above technical solution, the space occupied by the water-cooling tube 30 in the accommodating cavity 11 can be better reduced, the space utilization rate in the box body 1 can be further improved, and the energy density of the battery device 100 can be improved.

[0151] In some embodiments, reference Figure 1 、 Figure 5 and Figure 6Along the first direction e1, the energy absorbing structure 2 includes a first end portion 21, a first gradual transition portion 24, a middle portion 22, a second gradual transition portion 25 and a second end portion 23 connected in sequence. At least a portion of the middle portion 22 abuts against the rib 15. The first end portion 21, the middle portion 22 and the second end portion 23 all extend along the first direction e1. In the direction from the middle portion 22 to the first end portion 21, the first gradual transition portion 24 is inclined toward the direction close to the box body 1. In the direction from the middle portion 22 to the second end portion 23, the second gradual transition portion 25 is inclined toward the direction close to the box body 1.

[0152] The first end portion 21, the middle portion 22, and the second end portion 23 all extend along the first direction e1, so that the middle portion 22 can ensure the energy absorption capacity of the energy absorption structure 2 along the first direction e1, and the first end portion 21 and the second end portion 23 extending along the first direction e1 are convenient for connection with the box body 1, which can reduce the difficulty of assembly. The first gradient portion 24 and the second gradient portion 25 are arranged at an angle, so that the energy absorption structure 2 can adapt to the rib 15, so that the first end portion 21 and the second end portion 23 can abut against the box body 1, which is convenient for installation and can improve assembly efficiency. It can also increase the contact area between the box body 1 and the energy absorption structure 2, thereby enhancing the connection stability between the box body 1 and the energy absorption structure 2, and further improving the structural stability and structural strength of the box structure 10.

[0153] It should be noted that, except for the portion used to connect with the box body 1 , the rest of the energy absorbing structure 2 can abut against the box body 1 or be spaced apart from the box body 1 , and this application does not make any specific limitation on this.

[0154] In the above technical solution, the energy-absorbing structure 2 can adapt to the structure of the box body 1, making installation more convenient and the structural design more reasonable. This can reduce the difficulty of connecting the energy-absorbing structure 2 to the box body 1, thereby improving the assembly efficiency of the box structure 10. It can also enhance the stability of the connection between the box body 1 and the energy-absorbing structure 2, thereby improving the structural stability and strength of the box structure 10.

[0155] Secondly, refer to Figure 7 、 Figure 8 and Figure 9 The present invention provides an electrical device 1000, comprising: a battery device 100 according to an embodiment of the first aspect of the present invention.

[0156] The power-consuming device 1000 may be a vehicle, and the battery device 100 may be installed at the bottom of the vehicle body.

[0157] In the above-described technical solution, the battery cell assembly 20 is disposed within the accommodating cavity 11, and an energy-absorbing structure 2 is provided on the outer bottom wall of the box body 1. The energy-absorbing structure 2, at its ends along the first direction e1, is connected to the ends of the box body 1 along the first direction e1. This improves the structural strength and overall rigidity of the box structure 10, enhancing the extrusion resistance and collision resistance of the battery device 100 along the first direction e1. The energy-absorbing structure 2 also has an energy-absorbing effect, buffering collision extrusion forces and dissipating collision energy, thereby reducing the risk of thermal runaway of the battery device 100 and improving the safety of the electrical device 1000. Furthermore, the energy-absorbing structure 2 does not occupy the internal space of the box body 1, which helps increase the energy density and capacity of the battery device 100.

[0158] Refer to the following Figures 1-9 A battery device 100 according to some embodiments of the present invention is described.

[0159] Reference Figure 1-Figure 3 In this embodiment, the battery device 100 includes a box structure 10 and a battery cell assembly 20. The box structure 10 includes a box body 1 and a cover. A receiving cavity 11 is defined between the box body 1 and the cover. The box body 1 is provided with an energy absorbing structure 2 on the side of the box body 1 facing away from the receiving cavity 11 along the height direction e3 of the box structure 10. The box body 1 includes a box frame 12 and a box bottom plate 13. The box frame 12 is annular. The box bottom plate 13 is provided in the box frame 12 and connected to the box frame 12. The box bottom plate 13 and the box frame 12 jointly define the receiving cavity 11. The battery cell assembly 20 is provided in the receiving cavity 11. The energy absorbing structure 2 is provided on the side of the box bottom plate 13 facing away from the receiving cavity 11. Figure 4-Figure 6 The energy absorbing structure 2 extends along the first direction e1. Along the first direction e1, the energy absorbing structure 2 includes a first end 21, a middle portion 22, and a second end 23 arranged in sequence. The two ends of the middle portion 22 are respectively connected to the first end 21 and the second end 23. The first end 21 and the second end 23 are respectively connected to the box frame 12. Figure 2 e1 direction shown) and the height direction e3 of the box structure 10 (as shown Figure 2 direction e3 shown).

[0160] Thus, the energy-absorbing structure 2 and the box frame 12 can form an I-shaped structure. This can significantly improve the structural strength and overall rigidity of the box structure 10, enhance the box structure 10's anti-extrusion and anti-collision capabilities along the first direction e1, and enable the battery device 100 to better withstand greater impact or collision forces along the first direction e1.

[0161] The energy-absorbing structure 2 also has an energy-absorbing effect. When the box structure 10 is impacted along the first direction e1, the box frame 12 will be impacted first, and then the box frame 12 will directly transfer the impact force to the energy-absorbing structure 2. The energy-absorbing structure 2 can play a certain buffering and dispersion role on the impact force, buffer the collision extrusion force and consume the collision energy, thereby reducing the impact of the larger acceleration that the collision may cause to the battery cell assembly 20.

[0162] Furthermore, the energy-absorbing structure 2 is disposed outside the box body 1. This improves structural strength and energy absorption while not occupying the internal space of the box body 1, effectively alleviating the problem of limited internal space in the box body 1. Furthermore, this frees up internal space in the box body 1 to accommodate more battery cell assemblies 20 or increase the size of the battery cell assemblies 20, thereby increasing the energy density and improving the capacity of the battery device 100.

[0163] The energy absorbing structure 2 may be a solid tubular structure, which is beneficial to improving the structural strength and overall rigidity of the box structure 10 and further enhancing the anti-extrusion and anti-collision capabilities of the box structure 10 along the first direction e1.

[0164] Of course, the energy absorbing structure may further include a cavity extending along the first direction e1. The cavity can enhance the energy absorbing effect of the energy absorbing structure 2, thereby better buffering the collision extrusion force and consuming the collision energy, and can also reduce the weight of the energy absorbing structure 2 and reduce the cost.

[0165] Reference Figure 4-Figure 6 The middle portion 22 is cylindrical or elliptical, and the first end portion 21 and the second end portion 23 are at least flat surfaces facing the box body 1 .

[0166] Compared to other tubular shapes, cylindrical or elliptical tubular shapes offer greater bending stiffness and compressive stability, improving energy absorption efficiency. The uniform distribution of moment of inertia in all directions across a circular or elliptical cross-section enhances the energy-absorbing structure 2's resistance to bending and torsion, thereby increasing the structural strength and overall rigidity of the box structure 10 and enhancing its resistance to extrusion and collision along the first direction e1.

[0167] Arranging the first end portion 21 and the second end portion 23 as at least a flat surface facing the box body 1 can reduce the difficulty of connecting the energy-absorbing structure 2 to the box body 1, thereby facilitating improved assembly efficiency of the box structure 10. The flat surfaces of the first end portion 21 and the second end portion 23 abutting the box body 1 can increase the contact area between the box body 1 and the energy-absorbing structure 2, thereby enhancing the connection stability between the box body 1 and the energy-absorbing structure 2, and thereby improving the structural stability and strength of the box structure 10.

[0168] Reference Figure 1There are multiple energy absorbing structures 2, and the multiple energy absorbing structures 2 are arranged along the second direction e2 (such as Figure 2 The first direction e1 and the second direction e2 are spaced apart from each other (in the direction e2 shown in the figure), wherein the first direction e1 and the second direction e2 are perpendicular to the height direction e3 of the box structure 10 in pairs.

[0169] Multiple energy-absorbing structures 2 can form multiple I-shaped structures, which can further improve the structural strength and overall rigidity of the box structure 10, enhance the anti-extrusion and anti-collision capabilities of the box structure 10 along the first direction e1, and enable the battery device 100 to better resist greater impact force or collision force along the first direction e1.

[0170] When the box structure 10 is impacted along the first direction e1, multiple energy-absorbing structures 2 can simultaneously achieve energy absorption effects at multiple locations along the second direction e2, thereby improving the buffering and dispersion of the impact force, further reducing the risk of the collision force being directly transmitted to the battery cell assembly 20 and causing damage, and further improving the safety of the battery device 100.

[0171] The multiple energy absorbing structures 2 work together to reduce local stress concentration, which is beneficial to extending the service life of the box structure 10. When one energy absorbing structure 2 fails, the other energy absorbing structures 2 can continue to work, thereby improving the energy absorption stability of the box structure 10.

[0172] Reference Figure 4-Figure 6 The box frame 12 includes a first plate 121 and a second plate 122. The first plate 121 extends along the height direction e3 of the box structure 10. The first plate 121 is annular. The box bottom plate 13 is arranged on the inner side of the first plate 121. The second plate 122 is connected to the inner peripheral wall of the first plate 121. The second plate 122 extends horizontally toward the side away from the first plate 121. The second plate 122 is arranged on the side of the box bottom plate 13 away from the accommodating cavity 11 and is connected to the box bottom plate 13. The energy absorbing structure 2 is connected to the second plate 122 at both ends along the first direction e1.

[0173] Dividing the box frame 12 into the first plate 121 and the second plate 122 can reduce the difficulty of connecting the box frame 12 to the box bottom plate 13, as well as reducing the difficulty of connecting the energy-absorbing structure 2 to the box body 1, thereby improving the assembly efficiency of the box structure 10. It can also enhance the stability of the connection between the box bottom plate 13 and the box frame 12, as well as the stability of the connection between the energy-absorbing structure 2 and the box body 1, thereby improving the structural stability and strength of the box body 1 and the box structure 10.

[0174] The energy absorbing structure 2 is connected to the box body 1 by riveting, clamping or welding, which can improve the connection stability between the energy absorbing structure 2 and the box body 1 and improve production efficiency.

[0175] Energy-absorbing structure 2 is made of steel or aluminum. Steel improves the structural strength and impact resistance of energy-absorbing structure 2, facilitating its energy-absorbing effectiveness. Aluminum reduces weight and improves its energy-absorbing efficiency.

[0176] Furthermore, the outer wall of the energy-absorbing structure 2 is provided with multiple crush grooves spaced apart along the first direction e1. This allows for controllable deformation of the energy-absorbing structure 2, thereby achieving precise energy absorption. Multiple crush grooves enable phased energy absorption, thereby extending the energy absorption time, buffering and dispersing the impact force, and improving the energy absorption effectiveness of the energy-absorbing structure 2.

[0177] Along the height direction e3 of the box structure 10, an escape groove 14 is provided on the wall surface of the accommodating chamber 11 on the side facing away from the cover, and the water cooling pipe 30 is disposed within the escape groove 14. A rib 15 is provided on the side of the box body 1 facing away from the accommodating chamber 11 along the height direction e3 of the box structure 10, opposite to the escape groove 14.

[0178] Reference Figure 1 、 Figure 5 and Figure 6 Along the first direction e1, the energy absorbing structure 2 includes a first end portion 21, a first gradual transition portion 24, a middle portion 22, a second gradual transition portion 25 and a second end portion 23 connected in sequence. At least a portion of the middle portion 22 abuts against the rib 15. The first end portion 21, the middle portion 22 and the second end portion 23 all extend along the first direction e1. In the direction from the middle portion 22 to the first end portion 21, the first gradual transition portion 24 is inclined toward the direction close to the box body 1. In the direction from the middle portion 22 to the second end portion 23, the second gradual transition portion 25 is inclined toward the direction close to the box body 1.

[0179] The first and second gradient portions 24, 25 are arranged at an angle, allowing the energy-absorbing structure 2 to adapt to the ribs 15, allowing the first and second ends 21, 23 to abut against the box body 1, facilitating installation and improving assembly efficiency. This also increases the contact area between the box body 1 and the energy-absorbing structure 2, thereby enhancing the connection stability between the box body 1 and the energy-absorbing structure 2, and further improving the structural stability and strength of the box structure 10.

[0180] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0181] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A battery device, characterized in that: include: A box structure (10) includes a box body (1) and a cover body, a receiving cavity (11) is defined between the box body (1) and the cover body, an energy absorbing structure (2) is provided on a side of the box body (1) facing away from the cover body, the energy absorbing structure (2) extends along a first direction, the box body (1) includes a box frame (12) and a box bottom plate (13), the box frame (12) is annular, and the box bottom plate (13) is provided on the box frame (12). The energy absorbing structure (2) is provided on the side of the box bottom plate (13) facing away from the accommodating cavity (11), and the two ends of the energy absorbing structure (2) along the first direction are respectively connected to the box frame (12). The outer peripheral wall of the energy absorbing structure (2) is provided with a collapse groove, and the collapse groove is arranged in a plurality of intervals along the first direction. A battery cell assembly (20), wherein the battery cell assembly (20) is arranged in the accommodating cavity (11).

2. The battery device according to claim 1, wherein: The energy absorbing structure (2) is tubular.

3. The battery device according to claim 2, characterized in that At least part of the energy absorbing structure (2) is in the shape of a cylindrical tube or an elliptical tube.

4. The battery device according to claim 2, wherein: Along the first direction, the energy absorbing structure (2) comprises a first end portion (21), a middle portion (22) and a second end portion (23) arranged in sequence, the two ends of the middle portion (22) being connected to the first end portion (21) and the second end portion (23) respectively, the middle portion (22) being in the shape of a cylindrical tube or an elliptical tube, and the surfaces of the first end portion (21) and the second end portion (23) at least facing the box body (1) being flat.

5. The battery device according to claim 4, characterized in that The maximum thickness of the first end portion (21) along the height direction of the box structure (10) is smaller than the maximum thickness of the middle portion (22) along the height direction of the box structure (10); And / or, the maximum thickness of the second end portion (23) along the height direction of the box structure (10) is smaller than the maximum thickness of the middle portion (22) along the height direction of the box structure (10).

6. The battery device according to claim 4, characterized in that The maximum thickness of the first end portion (21) along the height direction of the box structure (10) is smaller than the maximum thickness of the first end portion (21) along the second direction; and / or, the maximum thickness of the second end portion (23) along the height direction of the box structure (10) is smaller than the maximum thickness of the second end portion (23) along the second direction, The first direction and the second direction are perpendicular to the height direction of the box structure (10).

7. The battery device according to claim 1, wherein: There are multiple energy absorbing structures (2), and the multiple energy absorbing structures (2) are spaced apart along the second direction, wherein the first direction and the second direction are perpendicular to the height direction of the box structure (10).

8. The battery device according to claim 1, wherein: The box frame (12) comprises: a first plate (121), the first plate extending along the height direction of the box structure (10), the first plate (121) being annular, and the box bottom plate (13) being arranged on the inner side of the first plate (121); A second plate (122), the second plate (122) is connected to the inner peripheral wall of the first plate (121), the second plate (122) extends in a horizontal direction toward a side away from the first plate (121), the second plate (122) is arranged on a side of the box bottom plate (13) away from the accommodating cavity (11) and is connected to the box bottom plate (13), and the energy absorbing structure (2) is connected to the second plate (122) at both ends along the first direction.

9. The battery device according to claim 1, wherein: The energy absorbing structure (2) is connected to the box body (1) by riveting, clamping or welding.

10. The battery device according to claim 1, wherein: The energy absorbing structure (2) is a steel part or an aluminum part.

11. The battery device according to claim 1, wherein: The energy absorbing structure (2) has a cavity therein, and the cavity extends along the first direction.

12. The battery device according to claim 1, wherein: Along the height direction of the box structure (10), a side wall surface of the accommodating cavity (11) facing away from the cover body is provided with an avoidance groove (14), and the battery device further comprises: A water cooling pipe (30), wherein the water cooling pipe (30) is arranged in the avoidance groove (14).

13. The battery device according to claim 12, characterized in that The box body (1) is provided with a convex rib (15) opposite to the avoidance groove (14) on a side away from the accommodating cavity (11) along the height direction of the box structure (10).

14. The battery device according to claim 13, wherein: Along the first direction, the energy absorbing structure (2) comprises a first end portion (21), a first gradual transition portion (24), a middle portion (22), a second gradual transition portion (25), and a second end portion (23) connected in sequence, at least a portion of the middle portion (22) abuts against the rib (15), and the first end portion (21), the middle portion (22), and the second end portion (23) all extend along the first direction. In the direction from the middle portion (22) to the first end portion (21), the first gradual transition portion (24) is inclined toward the direction close to the box body (1), and in the direction from the middle portion (22) to the second end portion (23), the second gradual transition portion (25) is inclined toward the direction close to the box body (1).

15. An electrical device, characterized in that: Comprising a battery device (100) according to any one of claims 1 to 14.

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