Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device.The battery device comprises a battery box body and a battery monomer, the battery box body comprises a first box body and a second box body which are oppositely arranged in the first direction, the first box body comprises a side wall and a bottom wall, the side wall surrounds the bottom wall and is connected with the bottom wall, and the second box body is connected with the side wall of the first box body; an accommodating cavity is defined by the first box body and the second box body, and the battery monomers are arranged in the accommodating cavity. The first box body further comprises an energy absorption structure arranged on the surface of the side, away from the containing cavity, of the bottom wall, the energy absorption structure and the bottom wall are of an integrated structure, and the energy absorption structure protrudes out of the bottom wall and is arranged in a deformable mode in the first direction. According to the battery device and the power utilization device in the embodiment of the invention, the protection performance of the battery device on the impact of the bottom ball can be improved, and the reliability of the battery device is 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 an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0003] As an important structure of new energy vehicles, the battery device is usually installed at the bottom of the vehicle body. It will inevitably be affected by bottom impact, causing damage to the internal structure of the battery, resulting in battery failure and even safety risks. Utility Model Content

[0004] In view of the above problems, the present application provides a battery device and an electrical device, which can improve the protection performance of the battery device against bottom ball impact and improve the reliability of the battery device.

[0005] In a first aspect, the present application provides a battery device comprising a battery case and a battery cell. The battery case comprises a first case and a second case disposed opposite each other along a first direction. The first case comprises side walls and a bottom wall, the side walls being disposed around and connected to the bottom wall, and the second case being connected to the side walls of the first case. The first and second cases together form a housing cavity, and the battery cell is disposed within the housing cavity. The first case is a one-piece injection-molded case, and further comprises an energy-absorbing structure disposed on a surface of the bottom wall facing away from the housing cavity. The energy-absorbing structure protrudes from the bottom wall and is deformable along the first direction.

[0006] In an embodiment of the present application, an energy-absorbing structure is integrally formed on the surface of the bottom wall of the first box body facing away from the accommodating cavity. The energy-absorbing structure can deform along the first direction to alleviate the impact force acting on the bottom wall of the battery box body, thereby improving the protection performance of the battery device against the impact of the bottom ball.

[0007] In some embodiments, the first box body is an integral injection-molded box body, which enables the energy-absorbing structure and the bottom wall to form an integral structure, thereby more evenly dispersing the impact force when the bottom ball impacts, and reducing structural damage caused by local stress concentration.

[0008] In some embodiments, the energy absorption structure includes a plurality of first energy absorption units spaced apart from each other along a second direction, and each first energy absorption unit is arranged to be inclined relative to the bottom wall along the second direction. The second direction intersects with the first direction, that is, inclined reinforcement ribs are formed on the bottom wall of the first box body. When the inclined reinforcement ribs are hit by the bottom ball, they are more convenient to deform and absorb energy, thereby reducing the impact on the bottom wall and reducing the risk of cracking.

[0009] In some embodiments, each of the first energy absorbing units is tilted toward the same side of the bottom wall along its arrangement direction, which can simplify the injection mold structure and improve the injection molding effect.

[0010] In some embodiments, multiple first energy absorption units are grouped along the second direction to form a first energy absorption group and a second energy absorption group. The first energy absorption group and the second energy absorption group are opposite to each other along the second direction, and the first energy absorption unit of the first energy absorption group and the first energy absorption unit of the second energy absorption group are arranged to be inclined away from each other along the second direction.

[0011] In the embodiment of the present application, since the energy absorption structure and the bottom wall are integrally injection molded, by placing the first energy absorption group and the second energy absorption group opposite to each other, the symmetrical figure-eight structure can disperse the pressure to both sides during mold injection molding, thereby reducing the risk of mold deformation due to excessive force, reducing the injection molding defect rate, and improving the manufacturing yield of the first box body.

[0012] In some embodiments, the energy absorption structure also includes a plurality of second energy absorption units spaced apart from each other in a third direction. The second energy absorption units and the first energy absorption units intersect to form a grid structure. The third direction intersects with the first direction and the second direction, and can disperse and absorb energy in multiple directions, thereby improving the energy absorption efficiency under the impact of the bottom ball and extending the service life of the battery device.

[0013] In some embodiments, each second energy-absorbing unit is inclined relative to the bottom wall along a third direction, which can also disperse the load from different directions, thereby improving the ability to absorb impact energy, achieving better resistance to bottom ball impact, and reducing the risk of structural instability.

[0014] In some embodiments, the first box body also includes a protruding structure arranged on the surface of the bottom wall facing the accommodating cavity, and the battery device also includes a water-cooling plate, which is arranged in the accommodating cavity and supports the battery cell. The protruding structure abuts against the water-cooling plate and encloses the water-cooling plate to form a cavity.

[0015] In the embodiment of the present application, a cavity is formed between the bottom wall and the water-cooling plate. When the bottom wall of the first box body is impacted by external force, the double-layer structure can also absorb and disperse the impact energy through the relative deformation between the two wall surfaces and the compression of the air layer, thereby utilizing the cavity between the bottom wall and the water-cooling plate to further absorb energy and reduce the damage caused by the impact to the battery cells in the battery box body.

[0016] In some embodiments, the protruding structure includes a plurality of first protrusions arranged at intervals along the second direction, and a plurality of recesses are provided on the surface of the water-cooling plate facing the bottom wall. The plurality of recesses are arranged at intervals along the second direction, and water-cooling channels are formed between adjacent recesses. Each first protrusion is at least partially inserted into the corresponding recess, which can make the fit between the two closer and improve the structural strength of the two, thereby enhancing the deformation resistance of the two.

[0017] In some embodiments, in the second direction, the first protrusion and the first energy absorbing unit are staggered.

[0018] In the embodiment of the present application, the first energy absorbing unit and the first protrusion are staggered along the second direction, that is, the connection position of the first energy absorbing unit on the bottom wall does not overlap with the connection position of the first protrusion on the bottom wall. This allows the impact force of the bottom ball hit to not be directly transmitted to the first protrusion on the inside when the first energy absorbing unit is impacted, thereby reducing the impact force transmitted by the first protrusion to the water-cooling plate, reducing the risk of failure of the battery cell under the bottom ball hit condition, improving the protection capability of the battery device against the bottom ball impact, and improving the protection capability of the internal battery cells.

[0019] In some embodiments, the protruding structure further includes a second protrusion, the protrusion distance of the second protrusion toward the accommodating cavity is less than the protrusion distance of the first protrusion toward the accommodating cavity, and the second protrusion extends along the second direction and abuts against the bottom of the water-cooling channel. The first protrusion and the second protrusion can support each other to form a multi-directional force-bearing grid structure with strong integrity, good stability, and more uniform force distribution. In addition, by making the second protrusion abut against the bottom of the water-cooling channel, the protruding structure can stably support the water-cooling plate while not directly contacting the bottom wall and the water-cooling plate, and reduce the impact of the impact on the battery cells.

[0020] In some embodiments, a filling portion is provided in the cavity, and the filling portion includes at least one of a heat insulating material and a buffering material.

[0021] In the embodiments of the present application, the filling portion may be at least one of a flexible adhesive, a flexible film, or a flexible sheet. The flexible adhesive may be, for example, foamed adhesive, which has excellent cushioning and thermal insulation properties, thereby enhancing the ability to cushion impacts from the bottom ball. By attaching a flexible film or sheet within the cavity, the filling portion can maintain the sealing of the receiving cavity even if the bottom wall cracks, thereby improving the performance of the battery device.

[0022] In some embodiments, the battery device further includes a bottom guard plate connected to the first housing, with the bottom wall of the first housing abutting the bottom guard plate via an energy-absorbing structure. When impacted by a ball, the bottom guard plate deforms to absorb energy, reducing the impact energy transferred to the battery cells and further enhancing the battery device's resistance to ball impacts.

[0023] In a second aspect, the present application provides an electrical device, which includes the battery device described in the above embodiment, and the battery device is used to provide electrical energy.

[0024] According to the embodiment of the present application, the battery device includes a battery case and a battery cell. The battery case includes a first case and a second case. The first case and the second case enclose a receiving cavity, and the battery cell is arranged in the receiving cavity. Particularly, by arranging an energy-absorbing structure on the surface of the bottom wall of the first case away from the receiving cavity, the energy-absorbing structure and the bottom wall form a whole, and the structural integrity is better. When the battery device is impacted by a bottom ball, the energy-absorbing structure can be deformed along the first direction, so that the energy-absorbing structure can be used to absorb and disperse the impact force, thereby alleviating the force acting on the bottom wall of the battery case, thereby reducing the impact on the battery cell in the battery case, improving the protection performance of the battery device against the impact of the bottom ball, and improving the reliability of the battery device.

[0025] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0027] Figure 1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0028] Figure 2 is an exploded schematic diagram of a battery device provided in some embodiments of the present application;

[0029] Figure 3 is a cross-sectional view of a first box provided in some embodiments of the present application;

[0030] Figure 4 This is a schematic diagram of the structure of the first box provided in some embodiments of the present application. Figure 1 ;

[0031] Figure 5 is a structural schematic diagram of a first box provided in other embodiments of the present application;

[0032] Figure 6 This is a schematic diagram of the structure of the first box provided in some embodiments of the present application. Figure 2 ;

[0033] Figure 7 Shown Figure 6 Cross-sectional view in the AA direction;

[0034] Figure 8 Shown Figure 6 Cross-sectional view along the BB direction.

[0035] The accompanying drawings in the specific implementation manner are as follows:

[0036] 100 battery device, 200 controller, 300 motor;

[0037] 10 battery boxes, 20 battery cells;

[0038] 1 first box body, 11 side wall, 12 bottom wall, 13 energy absorbing structure, 131 first energy absorbing unit, 132 second energy absorbing unit, 14 protruding structure, 141 first protrusion, 142 second protrusion, 2 second box body, 3 water cooling plate, 31 recess, 32 water cooling channel;

[0039] S cavity;

[0040] X is the second direction, Y is the third direction, and Z is the first direction. DETAILED DESCRIPTION

[0041] 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.

[0042] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0043] 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", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships 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.

[0044] In addition, the technical terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "plurality" is more than two, unless otherwise specifically defined.

[0045] 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; and 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.

[0046] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0047] Currently, market developments indicate that power batteries are becoming increasingly widely 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 vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0048] For example, in electric vehicles, the power battery is typically located at the bottom of the vehicle, making it inevitably subject to impact from stones or other flying objects. To protect the power battery, the battery case is equipped with reinforcing ribs on the inner wall of its bottom wall to increase the strength of the battery case and improve the battery device's protection against impact from balls. However, these reinforcing ribs do not provide significant protection against impact from balls. After an external impact on the battery case, there is still a risk of deformation, which may cause compression of the battery cells inside the battery case and, in severe cases, even lead to the risk of battery cell failure.

[0049] Based on the above considerations, an embodiment of the present application provides a new battery device, which has an energy-absorbing structure integrally formed on the outer wall surface of the bottom wall of the first box body. The energy-absorbing structure can alleviate the impact of external impact on the battery box body and improve the impact resistance of the battery device.

[0050] The battery device and the power-consuming device in the implementation of this application are described in detail below with reference to the accompanying drawings.

[0051] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical devices using the battery devices.

[0052] Electrical devices may include vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools. Vehicles may include fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles may include pure electric vehicles, hybrid vehicles, or extended-range vehicles. Spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Electric tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0053] It should be understood that the technical solutions described in the embodiments of the present application are applicable to all electrical devices including battery devices and using batteries, but for the sake of simplicity, the following embodiments are described using electric vehicles as an example.

[0054] See also Figure 1 , Figure 1 A schematic structural diagram of a vehicle provided for some embodiments of the present application.

[0055] A battery assembly 100 is installed inside the vehicle. The battery assembly 100 can be located at the bottom, front, or rear of the vehicle. The battery assembly 100 can be used to power the vehicle, for example, as an operating power source. The vehicle also includes a controller 200 and a motor 300. The controller 200 controls the battery assembly 100 to power the motor 300, for example, to meet the vehicle's starting, navigation, and driving needs.

[0056] Please also refer to Figure 2 and Figure 3 , Figure 2 Schematic diagram of an explosion of a battery device 100 provided in some embodiments of the present application. Figure 3 A cross-sectional view of the first box body 1 in some embodiments of the present application is shown.

[0057] The present application provides a battery device 100 , which includes a battery case 10 and a battery cell 20 accommodated in the battery case 10 .

[0058] The battery box 10 includes a first box 1 and a second box 2 arranged opposite to each other along a first direction Z. The first box 1 includes a side wall 11 and a bottom wall 12. The side wall 11 is arranged around the bottom wall 12 and connected to the bottom wall 12. The second box 2 is connected to the side wall 11 of the first box 1. The first box 1 and the second box 2 enclose a accommodating cavity.

[0059] The second housing 2 is connected to the side wall 11 of the first housing 1. The first housing 1 and the second housing 2 can be interlocked. The first housing 1 and the second housing 2 together define a housing cavity for accommodating the battery cell 20. The housing cavity is sealed to accommodate the battery cell 20. The term "sealed" here means covered or closed, and can be sealed or unsealed.

[0060] In some embodiments, the first direction Z is the height direction of the battery case 10. One of the first case 1 and the second case 2 is a lower case, and the other is an upper case. If the second case 2 covers the top of the first case 1, the second case 2 can be referred to as the upper case, and the first case 1 can be referred to as the lower case. If the first case 1 covers the top of the second case 2, the first case 1 can also be referred to as the upper case, and the second case 2 can also be referred to as the lower case.

[0061] The accommodating cavity formed by the battery case 10 is used to accommodate the battery cells 20. The battery case 10 can have various structures. For example, the first case 1 can be a hollow structure with one end open, and the second case 2 is a plate-shaped structure. The second case 2 covers the open side of the case body to form a battery case 10 with an accommodating cavity. Alternatively, the first case 1 and the second case 2 can also be hollow structures with one side open. The first case 1 and the second case 2 each have an accommodating space, and the open side of the second case 2 covers the open side of the first case 1 to form a battery case 10 with an accommodating cavity. Of course, the first case 1 and the second case 2 can have various shapes, such as cylinders, cuboids, etc.

[0062] In order to improve the sealing performance after the first box body 1 and the second box body 2 are connected, a sealing member such as a sealant or a sealing ring may be provided between the first box body 1 and the second box body 2 .

[0063] The battery device 100 mentioned in the embodiments of the present application may include one or more battery cells 20 for providing voltage and capacity. When the battery device 100 includes multiple battery cells 20, wherein the multiple battery cells 20 are connected in series, parallel, or parallel-parallel via a busbar to form a battery cell assembly, the battery device 100 may include one or more battery cell assemblies.

[0064] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells 20. As an example, the battery cell assembly can be a battery module, which is formed by arranging and securing multiple battery cells 20 to form a single module. For example, a battery module can be formed by bundling multiple battery cells 20 using cable ties.

[0065] By accommodating the battery cell assembly within the accommodating cavity of the battery case 10, the battery case 10 can encapsulate one or more battery cells 20, preventing liquids or other foreign matter from affecting the charging or discharging of the battery cells 20. As an example, the battery cell assembly may be a battery module, which may be accommodated in the battery case 10 by securing the battery module to the battery case 10. As an example, the battery cell assembly may also be accommodated in the battery case 10 by directly securing multiple battery cells 20 to the battery case 10.

[0066] In the embodiment of the present application, the battery cell 20 may be a secondary battery cell. A secondary battery cell refers to a battery cell 20 that can be recharged to activate the active material after discharge and continue to be used. The battery cell 20 includes, but is not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, and the like.

[0067] In order to improve the bottom ball impact resistance of the battery box 10, in the battery device 100 in the embodiment of the present application, the first box 1 also includes an energy absorption structure 13 arranged on the surface of the bottom wall 12 facing away from the accommodating cavity. The energy absorption structure 13 and the bottom wall 12 are an integrated structure. The energy absorption structure 13 protrudes from the bottom wall 12 and is deformable along the first direction Z.

[0068] The energy absorbing structure 13 and the bottom wall 12 are an integrated structure, which means that the energy absorbing structure 13 and the bottom wall 12 are formed as a whole through the same manufacturing process, have no independent connecting parts or seams, and have continuous material distribution and mechanical properties.

[0069] The energy absorbing structure 13 is deformable along the first direction Z, which can be understood as follows: after being subjected to an external impact, the size of the energy absorbing structure 13 along the first direction Z can change, and the first direction Z is the thickness direction of the bottom wall 12 .

[0070] In the embodiment of the present application, an energy-absorbing structure 13 is provided on the side of the bottom wall 12 of the first housing 1 facing away from the accommodating cavity. The energy-absorbing structure 13 and the bottom wall 12 form a single unit, enhancing structural integrity. When the battery device 100 is impacted by a ball, the energy-absorbing structure 13 is deformable along the first direction Z. This allows the energy-absorbing structure 13 to absorb and disperse the impact force, alleviating the force acting on the bottom wall 12 of the battery housing 10. This, in turn, reduces the impact on the battery cells 20 within the battery housing 10, improving the battery device 100's protection against ball impacts, and enhancing the reliability of the battery device 100.

[0071] Optionally, the energy absorbing structure 13 may absorb energy by crushing deformation or elastic deformation.

[0072] Crushing deformation absorbs energy by absorbing energy through irreversible plastic deformation when subjected to external forces. For example, the energy-absorbing structure 13 can be configured as a honeycomb structure. By employing crushing deformation to absorb energy, the energy-absorbing structure 13 dissipates a significant amount of energy during the destruction process, significantly reducing the force transmitted to the bottom wall 12.

[0073] Elastic deformation energy absorption means that when the energy absorbing structure 13 is subjected to external force, it absorbs energy through reversible elastic deformation, such as bending or compression. For example, it can be set as a reinforcing rib structure protruding from the surface of the bottom wall 12. Specifically, the energy absorbing structure 13 can be set as a curved reinforcing rib structure, such as an arc-shaped rib or a wavy rib, to decompose the external impact force into multi-directional forces, thereby improving the impact resistance of the battery case 10. Alternatively, the energy absorbing structure 13 can be set as a straight reinforcing rib structure. When it is impacted by the bottom ball, the straight reinforcing rib structure deforms and absorbs energy, thereby reducing the impact on the bottom wall 12 of the battery case 10, reducing the risk of cracking of the battery case 10 and damage and failure of the battery cells 20 therein.

[0074] In some embodiments, the first box body 1 is an integral injection-molded box body.

[0075] A one-piece injection-molded cabinet is one in which all components of the first cabinet 1 are integrally formed into a complete, seamless cabinet structure through a one-time injection molding process. Specifically, molten plastic material is injected into a mold, which cools and solidifies into the desired shape. Using this process, the side walls 11, bottom wall 12, and energy-absorbing structure 13 on the bottom wall 12 of the first cabinet 1 are injection-molded in a single process, eliminating the need for subsequent assembly and directly forming the first cabinet 1 with the energy-absorbing structure 13.

[0076] Optionally, the side walls 11 and the bottom wall 12 are made of the same material, while the energy absorbing structure 13 can be made of the same material as the side walls 11 and the bottom wall 12. Alternatively, the energy absorbing structure 13 can be made of a different material than the side walls 11 and the bottom wall 12. When the energy absorbing structure 13 is made of the same material as the side walls 11 and the bottom wall 12, the first housing 1 can be manufactured by injection molding in one step, which is simpler to manufacture.

[0077] Optionally, the first housing 1 is made of glass fiber reinforced plastic. Glass fiber, as a high-strength and high-temperature resistant material, can significantly enhance the tensile strength, compressive strength, and bending strength of the first housing 1, thereby better resisting external forces, improving the stability of the first housing 1, and enhancing the protective capability and structural stability of the battery housing 10.

[0078] Optionally, the second housing 2 is an integral injection-molded housing to improve the structural integrity and strength of the second housing 2. Furthermore, the second housing 2 can also be made of glass fiber reinforced plastic to improve the overall protection capability and structural stability of the battery housing 10.

[0079] Optionally, the glass fiber reinforced plastic material includes at least one of long glass fiber reinforced polypropylene, long glass fiber reinforced nylon, long glass fiber reinforced polyester, and long glass fiber reinforced nylon.

[0080] Because the first housing 1 is a one-piece injection-molded housing, the energy-absorbing structure 13 and bottom wall 12 form a single-piece structure. This eliminates the gap between the two and enhances overall rigidity. For example, during a ball impact, the integrally formed energy-absorbing structure 13 and bottom wall 12 more evenly distribute the impact force, reducing structural damage caused by localized stress concentration. Furthermore, the integral formation of the energy-absorbing structure 13 and bottom wall 12 creates a more direct energy transfer path, reducing energy loss caused by connectors (such as bolts and welds) in a separate structure and improving energy absorption efficiency.

[0081] When the battery device 100 is installed on the bottom of a vehicle, the bottom wall 12 of the first box body 1 can directly serve as a bottom guard plate, or the first box body 1 can also be connected to a bottom guard plate.

[0082] In some optional embodiments, the battery device 100 further includes a bottom guard plate connected to the first box body 1 , and the bottom wall 12 of the first box body 1 abuts against the bottom guard plate via an energy absorbing structure 13 (not shown in the figure).

[0083] Specifically, when the bottom guard plate is impacted by the bottom ball, it first deforms to absorb energy. Simultaneously, the energy-absorbing structure 13 is supported between the bottom guard plate and the bottom wall 12, providing the bottom guard plate with sufficient space for deformation and energy absorption. This prevents the bottom guard plate from directly contacting the bottom wall 12, thereby improving the energy absorption efficiency of the battery device 100. Furthermore, the energy-absorbing structure 13 transmits the impact force of the bottom guard plate to the bottom wall 12. The energy-absorbing structure 13 itself deforms to absorb and disperse the impact force, alleviating the force acting on the bottom wall 12 of the battery case 10. The force is then dispersed through the bottom wall 12, effectively protecting the battery cells 20 within the case and improving the reliability of the battery device 100.

[0084] Optionally, the first box body 1 may be connected to the bottom guard plate via a connecting piece, and the connecting piece may be a bolt connection.

[0085] It can be understood that when the bottom wall 12 of the first box body 1 is in contact with the bottom guard plate through the energy absorbing structure 13, after the bottom guard plate is impacted by the bottom ball, the force exerted by the bottom guard plate on the energy absorbing structure 13 is transmitted along the first direction Z. Therefore, the energy absorbing structure 13 can be set as a vertical reinforcement rib extending along the first direction Z, so as to simplify the setting of the energy absorbing structure 13 by directly contacting the bottom guard plate through the vertical reinforcement rib.

[0086] See also Figures 1 to 3 When the bottom wall 12 of the first box body 1 directly serves as the bottom guard plate, in order to facilitate the deformation of the energy absorbing structure 13 when the bottom ball impacts the first box body 1, in some optional embodiments, the energy absorbing structure 13 includes a plurality of first energy absorbing units 131 spaced apart from each other along the second direction X, and each first energy absorbing unit 131 is arranged obliquely relative to the bottom wall 12 along the second direction X, and the second direction X intersects with the first direction Z.

[0087] By setting the energy absorbing structure 13 as a plurality of inclined first energy absorbing units 131, that is, forming inclined reinforcement ribs on the bottom wall 12 of the first box body 1, compared with straight reinforcement ribs, the inclined reinforcement ribs can be more easily deformed and absorb energy when hit by the bottom ball, thereby effectively reducing the impact on the bottom wall 12 and reducing the risk of cracking.

[0088] It should be noted that when the bottom wall 12 of the first box body 1 is in contact with the bottom guard plate through the energy absorbing structure 13, the first energy absorbing unit 131 can also be inclined relative to the bottom wall 12 along the second direction X, that is, the first energy absorbing unit 131 in the embodiment of the present application can be used in a solution where the bottom wall 12 is directly used as a bottom guard plate, and can also be used in a solution where the bottom wall 12 is connected to the bottom guard plate through the energy absorbing structure 13.

[0089] Optionally, multiple first energy absorbing units 131 may be arranged along a second direction X from one end of the first housing 1 to the other, and / or each first energy absorbing unit 131 may extend along a third direction Y from one end of the first housing 1 to the other. The second direction X may be the width of the battery housing 10, and the third direction Y may be the length of the battery housing 10. By fully covering the bottom wall 12, the protection range and effectiveness of the bottom wall 12 can be significantly increased, thereby improving the reliability of the battery device 100.

[0090] Of course, the intervals between the first energy absorbing units 131 along the second direction X can be adjusted according to actual needs, so as to improve the protection effect while taking into account the need for lightweighting.

[0091] In some optional embodiments, each of the first energy absorbing units 131 is tilted toward the same side of the bottom wall 12 along its arrangement direction (not shown in the figures) to simplify the energy absorbing structure 13 .

[0092] Furthermore, the inclination angles of the first energy absorbing units 131 relative to the bottom wall 12 are the same. Since the energy absorbing structure 13 and the bottom wall 12 are integrally injection molded, by making the inclination angles of the first energy absorbing units 131 relative to the bottom wall 12 the same, the injection mold structure can be simplified and the injection molding effect can be improved.

[0093] Optionally, in the second direction X, the first energy absorbing unit 131 is tilted along the side away from the traveling direction of the vehicle, so that when the bottom wall 12 of the battery device 100 serves as a bottom guard plate and the bottom ball hits the first energy absorbing unit 131, it is easier to deform the first energy absorbing unit 131, thereby improving the energy absorption effect of the battery device 100.

[0094] See also Figures 1 to 4 , Figure 4 The structure of the first box 1 provided in some embodiments of the present application is shown Figure 1 .

[0095] In some optional embodiments, multiple first energy absorption units 131 are grouped along the second direction X to form a first energy absorption group and a second energy absorption group. The first energy absorption group and the second energy absorption group are opposite to each other along the second direction X, and the first energy absorption units 131 of the first energy absorption group and the first energy absorption units 131 of the second energy absorption group are arranged to be inclined away from each other along the second direction X.

[0096] By grouping multiple first energy absorption units 131 along the first direction Z to form a first energy absorption group and a second energy absorption group, and the first energy absorption units 131 of the first energy absorption group and the first energy absorption units 131 of the second energy absorption group are arranged to be inclined away from each other, the structural strength of the battery device 100 can be better improved, and it has better support, and can reduce weight while better resisting bottom ball hits.

[0097] Moreover, since the energy absorbing structure 13 and the bottom wall 12 are integrally injection molded, by placing the first energy absorbing group and the second energy absorbing group opposite to each other, the symmetrical figure-eight structure can disperse the pressure to both sides during mold injection molding, thereby reducing the risk of mold deformation due to excessive force, and reducing the injection molding defect rate, thereby improving the manufacturing yield of the first box body 1.

[0098] Optionally, the bottom wall 12 has a central plane perpendicular to the second direction X, and the first energy absorbing group and the second new energy absorbing group are respectively located on both sides of the central plane along the second direction X.

[0099] Optionally, the first energy absorbing units 131 of the first energy absorbing group have the same inclination angle relative to the bottom wall 12 , and / or the first energy absorbing units 131 of the second energy absorbing group have the same inclination angle relative to the bottom wall 12 .

[0100] By making the first energy absorbing units 131 of the first energy absorbing group and / or the first energy absorbing units 131 of the second energy absorbing group have the same inclination angle relative to the bottom wall 12, it is easier to balance the forces on the mold, simplify the energy absorbing structure 13, and improve the stability of the support.

[0101] See also Figures 1 to 5 , Figure 5 Schematic diagrams of the structures of the first box body 1 provided in some other embodiments of the present application are shown.

[0102] In some optional embodiments, the energy absorbing structure 13 further includes a plurality of second energy absorbing units 132 spaced apart from each other in a third direction Y, the second energy absorbing units 132 intersecting with the first energy absorbing units 131 to form a grid structure, and the third direction Y intersecting with the first direction Z and the second direction X.

[0103] By configuring the energy absorbing structure 13 as a first energy absorbing unit 131 and a second energy absorbing unit 132 intersecting with each other, energy can be dispersed and absorbed in multiple directions, thereby improving energy absorption efficiency under bottom ball impact and extending the service life of the battery device 100.

[0104] In some optional embodiments, each second energy absorbing unit 132 is arranged obliquely relative to the bottom wall 12 along the third direction Y. By obliquely arranging each second energy absorbing unit 132, loads from different directions can be dispersed, thereby improving the ability to absorb impact energy, achieving better resistance to bottom ball impact, and reducing the risk of structural instability.

[0105] See also Figures 1 to 7 , Figure 6 The structure of the first box 1 provided in some embodiments of the present application is shown Figure 2 , Figure 7 Shown Figure 6 Cross-sectional view in the AA direction.

[0106] In some optional embodiments, the first box body 1 also includes a protruding structure 14 arranged on the surface of the bottom wall 12 facing the accommodating cavity, and the battery device 100 also includes a water-cooling plate 3, which is arranged in the accommodating cavity and supports the battery cell 20. The protruding structure 14 abuts against the water-cooling plate 3 and encloses the water-cooling plate 3 to form a cavity S.

[0107] By providing a protruding structure 14 on the bottom wall 12 of the first housing 1, the water-cooling plate 3 can be supported, so that the large surface of the water-cooling plate 3 does not directly contact the bottom wall 12 of the first housing 1. A cavity S is formed between the bottom wall 12 and the water-cooling plate 3 to provide a buffering effect. Furthermore, by forming the cavity S between the bottom wall 12 and the water-cooling plate 3, when the bottom wall 12 of the first housing 1 is impacted by an external force, the double-layer structure can absorb and disperse the impact energy through the relative deformation between the two wall surfaces and the compression of the air layer. Thus, the cavity S between the bottom wall 12 and the water-cooling plate 3 can be used to further absorb energy, thereby reducing damage to the battery cells 20 within the battery housing 10 caused by the impact.

[0108] Optionally, the water-cooling plate 3 may be bonded to the bottom wall 12 of the first box body 1 .

[0109] In some optional embodiments, the protruding structure 14 includes a plurality of first protrusions 141 arranged at intervals along the second direction X, and a plurality of recesses 31 are provided on the surface of the water-cooling plate 3 facing the bottom wall 12. The plurality of recesses 31 are arranged at intervals along the second direction X, and water-cooling channels 32 are formed between adjacent recesses 31. Each first protrusion 141 is at least partially inserted into the corresponding recess 31.

[0110] Optionally, the water-cooling plate 3 is made of a double-layer metal plate by stamping and welding, and contains a closed water channel, which is arranged between two adjacent recesses 31 of the water-cooling plate 3 .

[0111] By configuring the water-cooling plate 3 with a concave-convex structure, and ensuring that the first protrusion 141 of the protruding structure 14 mates with the concave portion 31 of the water-cooling plate 3, with the first protrusion 141 at least partially inserted into the concave portion 31 of the water-cooling plate 3, the fit between the two is tightened, improving their structural strength and thus enhancing their resistance to deformation. Furthermore, while forming a cavity S between the bottom wall 12 and the water-cooling plate 3, the distance between the bottom wall 12 and the water-cooling plate 3 is reduced, reducing the internal space occupied by the battery device 100 and increasing the capacity of the battery device 100.

[0112] In some optional embodiments, in the second direction X, the first protrusion 141 and the first energy absorbing unit 131 are staggered.

[0113] Since the first energy absorbing unit 131 is arranged on the surface of the bottom wall 12 facing away from the accommodating cavity, and the first protrusion 141 is arranged on the surface of the bottom wall 12 facing the accommodating cavity, the first energy absorbing unit 131 and the first protrusion 141 are staggered along the second direction X, that is, the connection position of the first energy absorbing unit 131 on the bottom wall 12 and the connection position of the first protrusion 141 on the bottom wall 12 do not overlap, when the first energy absorbing unit 131 is impacted, the impact force of the bottom ball hit will not be directly transmitted to the first protrusion 141 on the inside, which is beneficial to reducing the impact force transmitted by the first protrusion 141 to the water-cooling plate 3, reducing the risk of failure of the battery cell 20 under the bottom ball hit condition, improving the protection capability of the battery device 100 against bottom ball impact, and improving the protection capability of the internal battery cell 20.

[0114] See also Figures 1 to 8 , Figure 8 Shown Figure 6 Cross-sectional view along the BB direction.

[0115] In some optional embodiments, the protruding structure 14 also includes a second protrusion 142, the protruding distance of the second protrusion 142 toward the accommodating cavity is smaller than the protruding distance of the first protrusion 141 toward the accommodating cavity, and the second protrusion 142 extends along the second direction X and abuts against the bottom of the water-cooling channel 32.

[0116] Specifically, the protruding structure 14 also includes a second protrusion 142, which is supported below the water-cooling channel 32. The first protrusion 141 and the second protrusion 142 can support each other, forming a multi-directional force-bearing grid structure with strong integrity, good stability, and more uniform force distribution. Furthermore, by ensuring that the protrusion distance of the second protrusion 142 toward the accommodating cavity is less than the protrusion distance of the first protrusion 141 toward the accommodating cavity, and by ensuring that the second protrusion 142 abuts below the water-cooling channel 32, the protruding structure 14 can stably support the water-cooling plate 3 while preventing direct contact between the bottom wall 12 and the water-cooling plate 3, and reducing the impact of impact on the battery cells 20.

[0117] Optionally, the number of the second protrusions 142 can be set to multiple, and the multiple second protrusions 142 are arranged at intervals along the third direction Y, and the third direction Y intersects with the first direction Z and the second direction X. Each second protrusion 142 is opposite to the water cooling channel 32 respectively, so as to support each water cooling channel 32 and improve the impact of the bottom ball impact on the battery device 100.

[0118] In some optional embodiments, a filling portion is provided in the cavity S, and the filling portion includes at least one of a heat insulating material and a buffer material.

[0119] When the filling portion is configured as a heat-insulating material, the heat-insulating performance of the battery case 10 can be improved by filling the cavity S with the heat-insulating material in the event of an external fire or high-temperature environment. This reduces the heat transferred to the accommodating cavity of the battery device 100, lowering the temperature of the battery cells 20 and reducing the risk of fire or explosion of the battery cells 20. Furthermore, when the filling portion is configured as a buffer material, the filling portion can further absorb the impact energy transferred to the bottom wall 12, reducing damage to the water-cooling plate 3 and the battery cells 20 thereon, thereby improving the reliability of the battery device 100.

[0120] As an optional embodiment, the filling portion can be at least one of a flexible adhesive, a flexible film, or a flexible sheet. The flexible adhesive can be, for example, foamed adhesive, which has excellent cushioning and thermal insulation properties, thereby enhancing the ability to cushion the impact of the bottom ball. By placing a flexible film or sheet within the cavity S, the filling portion can maintain the sealing of the receiving cavity even if the bottom wall 12 cracks, thereby improving the performance of the battery device 100.

[0121] See also Figures 1 to 8 Taking the battery device 100 in an embodiment of the present application as an example, the battery device 100 includes a battery case 10 and a water-cooling plate 3 and a battery cell 20 arranged in the battery case 10. The battery case 10 includes a first case 1 and a second case 2 arranged opposite to each other along a first direction Z.

[0122] The first box body 1 is an integral injection-molded box body, and the first box body 1 includes a side wall 11 and a bottom wall 12. The side wall 11 is arranged around the bottom wall 12 and connected to the bottom wall 12. The second box body 2 is connected to the side wall 11 of the first box body 1. The first box body 1 and the second box body 2 are enclosed to form a accommodating cavity, and the battery cell 20 is arranged in the accommodating cavity.

[0123] A protruding structure 14 is provided on the surface of the bottom wall 12 of the first box body 1 facing the accommodating cavity, and an energy absorbing structure 13 is provided on the surface of the bottom wall 12 of the first box body 1 facing away from the accommodating cavity.

[0124] The protruding structure 14 includes a plurality of first protrusions 141 spaced apart along the second direction X, and a plurality of second protrusions 142 spaced apart along the third direction Y. The surface of the water-cooling plate 3 facing the bottom wall 12 is recessed with a plurality of recesses 31. These recesses 31 are spaced apart along the second direction X, forming water-cooling channels 32 between adjacent recesses 31. Each first protrusion 141 is at least partially inserted into its corresponding recess 31, and the second protrusions 142 abut against the bottom of the water-cooling channel 32. The protruding structure 14 abuts the water-cooling plate 3, enclosing a cavity S.

[0125] The energy absorbing structure 13 includes a plurality of first energy absorbing units 131 spaced apart along the second direction X. The first energy absorbing units 131 and the first protrusions 141 are offset from each other along the second direction X. The plurality of first energy absorbing units 131 are grouped along the second direction X to form a first energy absorbing group and a second energy absorbing group. The first energy absorbing group and the second energy absorbing group are opposed to each other, and the first energy absorbing units 131 of the first energy absorbing group and the first energy absorbing units 131 of the second energy absorbing group are arranged at an angle away from each other.

[0126] In the battery device 100 of the embodiment of the present application, when the battery device 100 is impacted by a bottom ball, the energy-absorbing structure 13 is capable of deforming along a first direction Z. This allows the energy-absorbing structure 13 to absorb and disperse the impact force, thereby alleviating the force acting on the bottom wall 12 of the battery case 10. Furthermore, by forming a cavity S between the protruding structure 14 and the water-cooling plate 3, when the bottom wall 12 of the first case 1 is impacted by an external force, the double-layer structure is also capable of absorbing and dissipating the impact energy through the relative deformation between the two wall surfaces and the compression of the air layer. This allows the cavity S between the bottom wall 12 and the water-cooling plate 3 to further absorb energy, reducing damage to the battery cells 20 within the battery case 10 caused by the impact, improving the battery device 100's protection against bottom ball impacts, and enhancing the reliability of the battery device 100.

[0127] 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: The battery case includes a first case and a second case disposed opposite to each other along a first direction, wherein the first case includes side walls and a bottom wall, the side walls being disposed around and connected to the bottom wall, and the second case being connected to the side walls of the first case, the first and second cases enclosing a receiving cavity; A battery cell is disposed in the accommodating cavity; The first box body further includes an energy absorbing structure provided on a surface of the bottom wall facing away from the accommodating cavity. The energy absorbing structure and the bottom wall are an integral structure. The energy absorbing structure protrudes from the bottom wall and is deformable along the first direction.

2. The battery device according to claim 1, wherein: The first box body is an integral injection-molded box body.

3. The battery device according to claim 1, wherein: The energy absorbing structure includes a plurality of first energy absorbing units spaced apart from each other along a second direction, each of the first energy absorbing units being arranged obliquely relative to the bottom wall along the second direction, and the second direction intersects with the first direction.

4. The battery device according to claim 3, characterized in that Each of the first energy absorbing units is arranged obliquely toward the same side of the bottom wall along its arrangement direction.

5. The battery device according to claim 3, wherein: Multiple first energy absorbing units are grouped along the second direction to form a first energy absorbing group and a second energy absorbing group. The first energy absorbing group and the second energy absorbing group are opposite to each other along the second direction, and the first energy absorbing units of the first energy absorbing group and the first energy absorbing units of the second energy absorbing group are arranged to be inclined away from each other along the second direction.

6. The battery device according to any one of claims 3 to 5, characterized in that: The energy absorbing structure further includes a plurality of second energy absorbing units spaced apart from each other in a third direction, wherein the second energy absorbing units intersect with the first energy absorbing units to form a grid structure, and the third direction intersects with the first direction and the second direction.

7. The battery device according to claim 6, characterized in that Each of the second energy absorbing units is arranged obliquely relative to the bottom wall along the third direction.

8. The battery device according to any one of claims 3 to 5, characterized in that: The first box body also includes a protruding structure arranged on the surface of the bottom wall facing the accommodating cavity. The battery device also includes a water-cooling plate, which is arranged in the accommodating cavity and supports the battery cell. The protruding structure abuts against the water-cooling plate and encloses the water-cooling plate to form a cavity.

9. The battery device according to claim 8, characterized in that The protruding structure includes a plurality of first protrusions arranged at intervals along the second direction, and a plurality of recesses are provided on the surface of the water-cooling plate facing the bottom wall. The plurality of recesses are arranged at intervals along the second direction, and water-cooling channels are formed between adjacent recesses. Each of the first protrusions is at least partially inserted into the corresponding recess.

10. The battery device according to claim 9, characterized in that In the second direction, the first protrusion and the first energy absorbing unit are staggered.

11. The battery device according to claim 9, characterized in that The protruding structure further includes a second protrusion, the protrusion distance of the second protrusion toward the accommodating cavity is smaller than the protrusion distance of the first protrusion toward the accommodating cavity, and the second protrusion extends along the second direction and abuts against the bottom of the water-cooling channel.

12. The battery device according to claim 8, wherein: A filling portion is provided in the cavity, and the filling portion includes at least one of a heat insulating material and a buffer material.

13. The battery device according to claim 1, wherein: The battery device further includes a bottom guard plate connected to the first box body, and the bottom wall of the first box body abuts against the bottom guard plate through the energy absorbing structure.

14. An electrical device, characterized in that: The electrical device comprises a battery device according to any one of claims 1 to 13, and the battery device is used to provide electrical energy.

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