Battery device and electric appliance

Abstract

The application relates to a battery device and an electric device, wherein the battery device comprises a box assembly (100'), the box assembly (100') comprises a cover (10), the cover (10) comprises a first main body part (1), a reinforcing plate (2) arranged on one side of the first main body part (1) facing the inside of the box assembly (100'), a plurality of convex parts (5) arranged between the reinforcing plate (2) and the first main body part (1) and abutting against the first main body part (1) to form cavities (3) among the reinforcing plate (2), the first main body part (1) and the adjacent convex parts (5), and a buffer part (4) filled in the cavities (3). The embodiment can improve the working reliability of the battery device.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery device and electrical equipment. Background Technology

[0002] Due to the advantages of lithium-ion batteries, such as high energy density, high power density, high cycle life, and long storage time, they have been widely used in new energy electric vehicles.

[0003] In some battery devices, the battery cells are positioned upright, meaning the electrode terminals face upwards. During use, the battery cover is prone to deformation when subjected to external forces, which can affect the reliability of the electrical connection at the electrode terminals. Utility Model Content

[0004] The purpose of this application is to improve the operational reliability of battery devices.

[0005] According to a first aspect of this application, a battery device is provided, including a housing assembly, the housing assembly including a cover, the cover including:

[0006] First main body section;

[0007] A reinforcing plate is provided on the side of the first main body facing the interior of the housing assembly;

[0008] Multiple protrusions are located between the reinforcing plate and the first main body, and the protrusions abut against the first main body to form a cavity between the reinforcing plate, the first main body, and adjacent protrusions; and

[0009] A buffer section, which fills the cavity.

[0010] In this embodiment, the cover body has a reinforcing plate stacked on top of the first main body. Multiple protrusions are provided between the reinforcing plate and the first main body, and cavities are formed between the reinforcing plate, the first main body, and adjacent protrusions. This multi-layered structure improves the overall rigidity and deformability of the cover body, increases mechanical strength, effectively resists external impacts, and adds minimal weight to the cover. Furthermore, at least one cavity is formed between the first main body and the reinforcing plate. The first main body is located on the outermost side; when deformed by external impact, the cavity acts as a buffer, absorbing energy and effectively weakening the force transmitted to the battery cells. This improves the reliability and impact resistance of the battery device, making it suitable for harsh operating environments.

[0011] Moreover, this embodiment can add a buffer section on the basis of buffering and absorbing energy through the cavity. When the cover is subjected to external impact force, the relative deformation between the first main body and the reinforcing plate forces the buffer section to deform, further absorbing excess impact energy, optimizing the buffering and energy absorption and vibration reduction effect, reducing the impact of external impact on the internal battery cells, and improving the working reliability and impact resistance of the battery device. This type of battery device is suitable for relatively harsh operating environments.

[0012] In some embodiments, the cushioning portion includes a foamed material.

[0013] This embodiment uses foamed material as a buffer within the cavity, fully utilizing its lightweight and porous characteristics to fill the cavity with minimal increase in the cover's weight. An auxiliary protrusion between the first main body and the reinforcing plate provides uniform support, increasing the uniformity of impact force absorption by the cover. Furthermore, the foamed material's light weight and high porosity allow it to fully fill the cavity. When subjected to vibration, compression, or external impact, the foamed material effectively absorbs impact energy through pore compression and deformation, attenuating vibration transmission and further enhancing the cover's buffering and energy absorption effect. This reduces vibration transmission, better protecting the internal battery cells and improving the reliability of the battery device.

[0014] In some embodiments, at least one of the first main body and the reinforcing plate is provided with an injection hole, which forms a channel for injecting liquid material into the cavity to form a buffer section.

[0015] This embodiment, by providing an injection hole, allows liquid material to be injected into the cavity of the double-layer structure formed by the reinforcing plate and the first main body. The liquid material can fully fill the cavity by its own fluidity, and after it solidifies, it forms a buffer part that is tightly attached to the reinforcing plate, the first main body and the protrusion and forms an integral part.

[0016] This method facilitates filling and simplifies the process. When the cover area is large and the number of cavities is numerous, it can significantly improve production efficiency. Furthermore, it eliminates the need for additional buffer fixation, ensuring reliable fixation of the buffer section. Additionally, because the buffer section formed in this way can uniformly fill the cavities, it provides stable and uniform support for the reinforcing plate and the first main body, improving the overall rigidity and structural stability of the cover. Simultaneously, it effectively absorbs energy when subjected to vibration or impact at different locations on the cover, enhancing vibration damping and impact resistance, thereby improving the reliability of the battery device.

[0017] In some embodiments, the battery device includes a plurality of reinforcing plates arranged side by side along at least one of a first direction and a second direction, the first direction and the second direction being at an angle and both being perpendicular to the thickness direction of the cover.

[0018] This embodiment features multiple independent reinforcing plates on the first main body. The number, distribution, and spacing of these plates can be rationally arranged according to the actual protection requirements of the cover, achieving targeted structural reinforcement and energy absorption. This results in superior impact protection while reducing the overall weight of the cover, ensuring the reliability of the battery device. Furthermore, the smaller area of ​​each reinforcing plate reduces processing difficulty and cost, and the plates are less prone to deformation during processing, minimizing additional stress after assembly with the first main body.

[0019] In some embodiments, a plurality of protrusions are spaced apart along a first direction, and each protrusion extends along a second direction, the first direction being at an angle to the second direction and all being perpendicular to the thickness direction of the cover.

[0020] This embodiment, by spaced out multiple elongated protrusions, forms a continuous support frame along the second direction and spaced apart along the first direction between the first main body and the reinforcing plate. This effectively improves the overall structural rigidity of the cover, as well as its resistance to compression, bending, and torsion, making it less prone to local collapse and exhibiting superior structural strength. Furthermore, the regular shape of this structure allows liquid materials to flow smoothly throughout the entire cavity after injection, facilitating manufacturing. In addition, the continuous extension of the protrusions along the second direction effectively resists lateral forces along the first direction.

[0021] In some embodiments, the reinforcing plate has a plurality of recesses on the side away from the first main body along the thickness direction of the cover, and the plurality of recesses are provided in correspondence with a plurality of protrusions, and the recesses extend into the protrusions.

[0022] This embodiment improves the rigidity of the reinforcing plate while reducing weight. When the cover is subjected to impact, the recessed part deforms more easily, improving the energy absorption effect and further enhancing the working reliability of the battery device.

[0023] In some embodiments, the plurality of protrusions are integrally formed with the reinforcing plate.

[0024] This embodiment integrates multiple protrusions with the reinforcing plate, which simplifies the assembly of the cover, improves the connection reliability between the protrusions and the reinforcing plate, and makes the first main body part similar to the original cover structure. It only requires setting the component formed by the reinforcing plate and the protrusions on the surface of the first main body part facing the inside of the box assembly.

[0025] In some embodiments, a plurality of protrusions are integrally formed with one of the reinforcing plate and the first body portion, and the plurality of protrusions are bonded to the other of the reinforcing plate and the first body portion.

[0026] This embodiment simplifies the assembly of the cover by integrally molding multiple protrusions with one of the reinforcing plate and the first main body, and improves the reliability of the connection between the protrusions and the reinforcing plate. This allows the protrusions to provide stable support for the cover and increase structural rigidity. Furthermore, the bonding of multiple protrusions with the other of the reinforcing plate and the first main body improves the reliability of the direct connection between the two-layer structure during assembly, preventing positional misalignment and better leveraging the increased rigidity and enhanced energy absorption effect.

[0027] In some embodiments, the cover further includes:

[0028] The second main body abuts against the side of the reinforcing plate away from the first main body along the thickness direction of the cover.

[0029] This embodiment allows the reinforcing plate and multiple protrusions to be clamped and fixed between the first and second main body sections, reliably limiting and constraining the reinforcing plate. This prevents misalignment of the reinforcing plate under vibration and impact conditions and makes it less prone to detachment, thus improving the structural stability of the cover. Furthermore, this three-layer structure further enhances the cover's rigidity and deformation resistance, preventing impact on the internal battery cells and improving the reliability of the battery device. Additionally, this structure allows for the use of composite materials in the first and second main body sections, increasing the cover's rigidity while achieving weight reduction.

[0030] In some embodiments, the second body portion is made of an insulating material.

[0031] This embodiment uses an insulating material for the second main body portion near the battery cell, forming a reliable insulating layer between the cover and the battery cell. This prevents short circuits or leakage risks between the battery cell and the cover, improving the insulation reliability of the battery device. Furthermore, it eliminates the need for an additional insulating layer between the cover and the battery cell, simplifying the structural complexity of the battery device.

[0032] In some embodiments, the battery device further includes a battery assembly disposed within the housing assembly and comprising:

[0033] Multiple battery cells, each battery cell including electrode terminals, the electrode terminals being positioned towards the cover; and

[0034] The busbar is configured to electrically connect the electrode terminals corresponding to different battery cells.

[0035] This embodiment takes into account the small gap between the cover and the top of the battery assembly. When the electrode terminals of the battery cell are facing upwards, the impact force will be transmitted to the busbar and electrode terminals when the cover is impacted. This can easily cause deformation or misalignment of the busbar and electrode terminals, resulting in welding failure between them. Alternatively, when the pressure relief component of the battery cell is also facing the cover, the pressure relief component can easily fail under the squeezing action of the deformed cover, leading to the risk of thermal runaway.

[0036] According to a second aspect of this application, an electrical device is provided, including the battery device of the above embodiment, the battery device being used to provide electrical energy to the electrical device.

[0037] In some embodiments, the electrical equipment includes a vehicle, the vehicle including a body floor having an opening, and a cover located within the opening and as part of the body floor.

[0038] For this type of battery installation, since the cover, as part of the vehicle floor, is subject to constant foot traffic and severe impacts, the cover of the battery device in this application possesses superior structural rigidity. This reduces the degree of deformation upon impact, and even if deformation occurs, the cavity acts as a buffer to absorb energy, effectively weakening the force transmitted to the busbars and electrode terminals, preventing electrical connection failure between them. Alternatively, when the pressure relief components of the individual battery cells are also positioned facing the cover, it also prevents the pressure relief components from failing. Therefore, the reliability of the battery device is improved, enabling it to adapt to more demanding operating conditions. Attached Figure Description

[0039] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of the structure of some embodiments of the electrical equipment used in this application, which are vehicles.

[0041] Figure 2 This is a schematic diagram of the structure of some embodiments of the battery device of this application.

[0042] Figure 3 This is a schematic diagram of some embodiments of the battery device of this application installed on the vehicle floor.

[0043] Figure 4 These are cross-sectional views of some embodiments of the battery device of this application.

[0044] Figure 5This is a cross-sectional view of the cover in the battery device of this application along the thickness direction.

[0045] Figure 6 This is a front view of some embodiments of the cover in the battery device of this application.

[0046] Figure 7 This is a structural diagram showing the reinforcing plate facing the first main body.

[0047] Figure 8 The diagram shows the structure of some other embodiments of the cover of this application.

[0048] The accompanying drawings are not drawn to scale.

[0049] Marker explanation:

[0050] 100. Battery assembly; 100'. Housing assembly; 10. Cover; 1. First main body; 2. Reinforcing plate; 21. Injection hole; 3. Cavity; 4. Buffer part; 5. Protrusion; 6. Adhesive strip; 7. Second main body; 20. Housing; 30. Battery cell; 301. Electrode terminal; 40. Busbar;

[0051] 200. Vehicle; 201. Cabin; 202. Vehicle floor; 203. Vehicle body floor; 204. Opening;

[0052] x, first direction; y, second direction; z, thickness direction. Detailed Implementation

[0053] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0054] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0055] This application uses terms such as "upper," "lower," "top," "bottom," "front," "back," "inner," and "outer" to indicate orientation or positional relationships. This is only for the convenience of describing this application and is not intended to indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the scope of protection of this application.

[0056] Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" does not mean strictly vertical, but rather within the permissible range of error. "Parallel" does not mean strictly parallel, but rather within the permissible range of error. The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application.

[0057] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances.

[0058] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least some of the embodiments of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0059] Battery cells can include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and this application embodiment is not limited to these. Battery cells can be cylindrical, flat, cuboid, or other shapes, etc., and this application embodiment is not limited to these. Battery cells are generally divided into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and this application embodiment is not limited to these. Current battery cells typically include a casing and electrode components housed within the casing, and the casing is filled with electrolyte.

[0060] Current battery cells typically include a casing and an electrode assembly housed within the casing, with an electrolyte filled inside. The electrode assembly is mainly formed by stacking or winding a first electrode and a second electrode with opposite polarities, and a separator is usually provided between the first and second electrodes. The coated portions of the first and second electrodes constitute the main body of the electrode assembly, while the uncoated portions of the first and second electrodes each constitute a first tab and a second tab. In lithium-ion batteries, the first electrode can be a positive electrode, including a positive current collector and a positive electrode coating layer disposed on both sides of the positive current collector. The material of the positive current collector can be, for example, aluminum, and the positive electrode coating can be, for example, lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The second electrode can be a negative electrode, including a negative current collector and a negative electrode coating layer disposed on both sides of the negative current collector. The material of the negative current collector can be, for example, copper, and the negative electrode coating layer can be, for example, graphite or silicon. The first tab and the second tab can be located together at one end of the main body or at opposite ends of the main body. During the charging and discharging process of a single battery cell, the positive electrode coating and the negative electrode coating react with the electrolyte, and the tabs connect to the electrode leads to form a current loop.

[0061] In some current battery devices, multiple battery cells are upright, meaning the electrode terminals of each cell face upwards. To achieve electrical connection between these cells, their electrode terminals are connected via a busbar. During use, the cover of the battery device is prone to deformation under external forces. Due to the close proximity of the cover to the busbar and electrode terminals, this deformation can compress the busbar and electrode terminals, causing deformation, misalignment, or welding failure. This affects the reliability of the electrical connection between the multiple battery cells and reduces the overall reliability of the battery device.

[0062] For example, when the cover is part of the vehicle's floor, it is more prone to deformation when subjected to prolonged direct foot traffic or severe impacts, which can significantly affect the reliability of the battery device.

[0063] Therefore, this application proposes an improved battery device to enhance the reliability of the battery device. The battery device includes a housing assembly, which includes a cover. The cover includes a first main body portion and a reinforcing plate disposed on the side of the first main body portion facing the interior of the housing assembly. The reinforcing plate includes a plate body and multiple protrusions connected to the plate body and located between the plate body and the first main body portion. The protrusions abut against the first main body portion to form a cavity between the plate body, the first main body portion, and adjacent protrusions. This embodiment of the cover body improves the overall rigidity and deformability of the cover body, increases mechanical strength, effectively resists external impacts, and adds minimal weight to the cover. Furthermore, at least one cavity is formed between the first main body portion and the reinforcing plate. Since the first main body portion is located on the outermost side, when deformed by external impact forces, the cavity acts as a buffer, absorbing energy and effectively weakening the force transmitted to the individual battery cells, thereby improving the reliability and impact resistance of the battery device. This type of battery device is suitable for harsh operating environments.

[0064] The battery device described in this application is applicable to various electrical devices. These devices can be mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys, and power tools, etc.

[0065] like Figure 1 As shown, the electrical equipment can be a vehicle 200, such as a new energy vehicle, which can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle; or the electrical equipment can be a drone or a ship. The vehicle 200 may include a cabin 201 and a vehicle floor 202, with the battery device 100 located between the cabin 201 and the vehicle floor 202. The battery device 100 can be located at the bottom, front, or rear of the vehicle 200, and is used to provide electrical power for the motor and other components in the vehicle.

[0066] like Figure 2 As shown, the battery device 100 includes a housing assembly 100' and individual battery cells 30. In the battery device 100, there can be one or more individual battery cells 30. If there are multiple individual battery cells 30, they can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that the multiple individual battery cells 30 are connected in both series and parallel configurations. This can be achieved by first connecting multiple individual battery cells 30 in series, parallel, or in a mixed configuration to form a battery module, and then connecting multiple battery modules in series, parallel, or in a mixed configuration to form a whole, which is then housed within the housing assembly 100'. Alternatively, all the individual battery cells 30 can be directly connected in series, parallel, or in a mixed configuration, and then the whole consisting of all the individual battery cells 30 is housed within the housing assembly 100'.

[0067] The housing assembly 100' can be part of the battery device 100, and the housing assembly 100' can be detachably installed on the electrical equipment for easy maintenance; or, the housing assembly 100' can be a space formed by a structural component in the electrical equipment to accommodate the battery cell 30. For example, when the battery cell 30 is used in the vehicle 200, the housing assembly 100' is a space formed by the vehicle frame to accommodate the battery cell 30.

[0068] The housing assembly 100' is hollow inside and is used to accommodate one or more battery cells 30. Depending on the shape, number, combination and other requirements of the battery cells 30 accommodated, the housing assembly 100' may also have different shapes and sizes.

[0069] The battery cell 30 can be a rechargeable battery. A rechargeable battery is a battery cell 30 that can be used again after being discharged by recharging to activate the active materials.

[0070] The battery cell 30 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0071] As an example, the battery cell 30 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0072] This application provides a battery device 100, such as Figure 2 , Figure 4 and Figure 5 As shown, the device includes a housing assembly 100', which includes a cover 10. The cover 10 includes:

[0073] First main body section 1;

[0074] Reinforcing plate 2 is provided on the side of the first main body 1 facing the interior of the housing assembly 100';

[0075] Multiple protrusions 5 are located between the reinforcing plate 2 and the first main body 1, and the protrusions 5 abut against the first main body 1 to form a cavity 3 between the reinforcing plate 2, the first main body 1, and the adjacent protrusions 5; and

[0076] Buffer section 4, which is filled inside cavity 3.

[0077] The housing assembly 100' includes a cover 10 and a housing 20. The housing 20 has an opening, and the cover 10 is detachably connected to the housing 20 and closes the opening. For example, the cover 10 can be connected to the housing 20 by fasteners. The housing assembly 100' forms a space to accommodate the battery cell 30.

[0078] The cover 10 includes a first main body 1 and a reinforcing plate 2. In one structural form, the reinforcing plate 2 is disposed on the inner surface of the first main body 1, and only the first main body 1 is connected to the housing 20. In another structural form, the first main body 1 and the reinforcing plate 2 are configured as a double-layer structure, and are integrally connected to the housing 20. For example, the first main body 1 may be made of composite material (e.g., glass fiber reinforced composite material) or stamped sheet metal.

[0079] Multiple protrusions 5 are located between the reinforcing plate 2 and the first main body 1. The multiple protrusions 5 can be pre-connected to one of the reinforcing plate 2 and the first main body 1 to form an integral component, for example, by integral molding, welding or fastener connection, and then the integral component is stacked with the other of the reinforcing plate 2 and the first main body 1. Optionally, the multiple protrusions 5 are individual components and are connected to at least one of the reinforcing plate 2 and the first main body 1.

[0080] For example, the protrusion 5 can be block-shaped, strip-shaped, or column-shaped. The protrusion 5 abuts against the first main body 1 and forms a cavity 3 between the reinforcing plate 2, the first main body 1, and the adjacent protrusion 5. For example, the cavity 3 can be a cuboid, cube, cylinder, prism, or other shape.

[0081] Among them, the buffer part 4 can be an elastic element, such as a spring, rubber, etc., or the buffer part 4 can also be a honeycomb structure, etc. Any structure that can deform under the pressure to achieve the buffer energy absorption characteristics is within the protection range.

[0082] Preferably, in the initial state where the cover 10 has not deformed, the buffer portion 4 is in contact with both the reinforcing plate 2 and the first main body portion 1. The buffer portion 4 may have a preset compression amount or be in a non-compressed state. The buffer portion 4 may be in contact with the protrusion 5 or may have a gap between them.

[0083] Optionally, the buffer section 4 may not be provided in the cavity 3. There may be multiple cavities 3, and optionally, each cavity 3 may be provided with a buffer section 4. Alternatively, some of the multiple cavities 3 may be provided with buffer sections 4, while others may not be provided with buffer sections 4.

[0084] In this embodiment, the cover 10 has a reinforcing plate 2 stacked on top of the first main body 1. Multiple protrusions 5 are provided between the reinforcing plate 2 and the first main body 1, and a cavity 3 is formed between the reinforcing plate 2, the first main body 1, and adjacent protrusions 5. This multi-layered structure improves the overall rigidity and deformability of the cover 10, increases mechanical strength, effectively resists external impacts, and adds minimal weight to the cover 10. Furthermore, at least one cavity 3 is formed between the first main body 1 and the reinforcing plate 2. Since the first main body 1 is located on the outermost side, when deformed by external impact, the cavity 3 acts as a buffer, absorbing energy and effectively weakening the force transmitted to the battery cell 30. This improves the reliability and impact resistance of the battery device 100, making it suitable for harsher operating environments.

[0085] Moreover, this embodiment can add a buffer part 4 on the basis of buffering and absorbing energy through the cavity 3. When the cover 10 is subjected to external impact force, the relative deformation between the first main body 1 and the reinforcing plate 2 forces the buffer part 4 to deform, further absorbing excess impact energy, optimizing the buffering and energy absorption and vibration reduction effect, reducing the impact of external impact on the internal battery cells 30, and improving the working reliability and impact resistance of the battery device 100. This battery device 100 can be used in relatively harsh operating environments.

[0086] In some embodiments, the buffer portion 4 includes a foamed material.

[0087] Among them, foamed materials refer to lightweight porous materials with a large number of micropores in their interior formed by foaming, such as polyurethane foam, polypropylene foam, foamed rubber, foamed silicone or foamed epoxy resin, etc.

[0088] In this embodiment, foamed material is used as a buffer 4 within the cavity. This fully utilizes its lightweight and porous characteristics, filling the cavity 3 with minimal increase in weight to the cover 10. An auxiliary protrusion 5 between the first main body 1 and the reinforcing plate 2 provides uniform support, increasing the uniformity of impact force absorption by the cover 10. Furthermore, the foamed material is lightweight and has high porosity, allowing it to fully fill the cavity 3. When subjected to vibration, compression, or external impact, the foamed material effectively absorbs impact energy through pore compression and deformation, attenuating vibration transmission and further enhancing the buffering and energy absorption effect of the cover 10, thus better protecting the internal battery cells 30 and improving the operational reliability of the battery device 100.

[0089] In some embodiments, such as Figure 6 As shown, at least one of the reinforcing plate 2 and the first main body 1 is provided with an injection hole 21, which forms a channel for injecting liquid material into the cavity 3 to form a buffer part 4.

[0090] For example, each cavity 3 is provided with at least one injection hole 21, through which liquid material can enter the corresponding cavity 3. When multiple injection holes 21 are provided in each cavity 3, the multiple injection holes 21 can be evenly distributed. The injection holes 21 are provided in the cavity 3.

[0091] For example, the injection hole 21 can be a round hole, a polygonal hole, or any other arbitrary shape.

[0092] For example, the liquid material can be a foaming material or other liquid material that can solidify at room temperature or high temperature.

[0093] This embodiment, by providing an injection hole 21, allows liquid material to be injected into the cavity 3 of the double-layer structure formed by the reinforcing plate 2 and the first main body 1. The liquid material can fully fill the cavity 3 by its own fluidity, and after it solidifies, it forms a buffer part 4 that is closely attached to the reinforcing plate 2, the first main body 1 and the protrusion 5 and forms an integral part.

[0094] This method facilitates filling and simplifies the process. When the area of ​​the cover 10 is large and the number of cavities 3 is numerous, it can greatly improve production efficiency. Furthermore, it eliminates the need for additional fixing of the buffer section 4, ensuring reliable fixation. Additionally, since the buffer section 4 formed in this way can uniformly fill the cavities 3, it provides stable and uniform support for the reinforcing plate 2 and the first main body 1, improving the overall rigidity and structural stability of the cover 10. Simultaneously, it effectively absorbs energy when subjected to vibration or impact at different locations on the cover 10, enhancing vibration damping and impact resistance, thereby improving the reliability of the battery device 100.

[0095] In some embodiments, such as Figure 6 As shown, the battery device 100 includes a plurality of reinforcing plates 2, which are arranged side by side along at least one of a first direction x and a second direction y. The first direction x and the second direction y are at an angle and are both perpendicular to the thickness direction z of the cover 10.

[0096] In this design, the first direction x can be either the length or width of the cover 10, and the second direction y forms an angle with the first direction x, for example, the second direction y is perpendicular to the first direction x. For example, multiple reinforcing plates 2 can be arranged side-by-side only along the first direction x; or, multiple reinforcing plates 2 can be arranged side-by-side only along the second direction y; or, multiple reinforcing plates 2 can be arranged side-by-side along both the first direction x and the second direction y, such as in a rectangular array. The placement of the reinforcing plates 2 can be determined based on the actual impact force experienced by the cover 10, and they are placed in areas where the impact force exceeds a preset threshold. Adjacent reinforcing plates 2 are either adjacent or spaced apart, and areas of the cover 10 where the impact force is relatively small may not be covered by reinforcing plates 2.

[0097] Optionally, only one reinforcing plate 2 is provided, covering the area of ​​the first main body 1 that is subjected to greater impact force, or covering the entire surface of the first main body 1 used to withstand impact.

[0098] In this embodiment, multiple independent reinforcing plates 2 are provided on the first main body 1. The number, distribution, and spacing of the reinforcing plates 2 can be rationally arranged according to the actual needs of the cover 10 for the protected area, so as to achieve targeted structural reinforcement and energy absorption. While reducing the overall weight of the cover 10, it achieves a better impact protection effect and ensures the reliability of the battery device 100. Moreover, it is beneficial to the area of ​​a single reinforcing plate 2, which can reduce the processing difficulty and cost. The reinforcing plate 2 is also less likely to deform during processing, reducing the additional stress on the reinforcing plate 2 after it is assembled with the first main body 1.

[0099] In some embodiments, such as Figure 7 As shown, multiple protrusions 5 are spaced apart along the first direction x, and each protrusion 5 extends along the second direction y. The first direction x and the second direction y are at an angle, and they are all perpendicular to the thickness direction z of the cover 10.

[0100] In this design, the first direction x can be either the length or width of the cover 10, and the second direction y forms an angle with the first direction x, for example, the second direction y is perpendicular to the first direction x. The protrusion 5 is elongated and can extend along the second direction y to the edge of the first main body 1, or extend to a predetermined distance from the edge of the first main body 1. For example, the protrusion 5 can be elongated rectangular, making the filling of the buffer part 4 in the cavity 3 more uniform and improving the buffering energy absorption effect.

[0101] For example, the width of the protrusion 5 along the first direction x can be the same as the spacing between two adjacent protrusions 5, so that the protrusions 5 and the cavities 3 are evenly distributed. This makes the stress and deformation of the cover 10 more uniform when subjected to impact loads, avoiding local stress concentration and significantly improving the structural rigidity and impact resistance of the cover 10. Moreover, it can make the volume of liquid material filled in each cavity 3 consistent, achieving equal volume filling, simplifying the filling process, and ensuring that the buffer part 4 in each cavity 3 achieves a consistent energy absorption effect. Optionally, the width of the protrusion 5 along the first direction x can also be greater than or less than the spacing between two adjacent protrusions 5.

[0102] In other embodiments, the protrusion 5 extending along the second direction y may also be provided intermittently.

[0103] This embodiment, by spaced out multiple elongated protrusions 5, forms a support frame between the first main body 1 and the reinforcing plate 2, continuously arranged along the second direction y and spaced apart along the first direction x. This effectively improves the overall structural rigidity of the cover 10, as well as its resistance to pressure, bending, and torsion, making it less prone to local collapse and exhibiting superior structural strength. Moreover, the regular shape of this structure allows liquid materials to flow smoothly throughout the entire cavity after injection, facilitating manufacturing. Furthermore, the continuous extension of the protrusions 5 along the second direction y effectively resists lateral forces along the first direction x.

[0104] In some embodiments, the reinforcing plate 2 has a plurality of recesses along the thickness direction z of the cover 10 away from the first main body 1, and the plurality of recesses are provided in a one-to-one correspondence with the plurality of protrusions 5, and the recesses extend into the protrusions 5.

[0105] In this configuration, multiple protrusions 5 are spaced apart along the first direction x, and the protrusions 5 extend along the second direction y. The reinforcing plate 2 has a recess on the back of each protrusion 5, forming a corrugated structure together with the protrusions 5.

[0106] This embodiment improves the rigidity of the reinforcing plate 2 and reduces the weight. When the cover 10 is subjected to impact, it is easier to deform with the help of the recess, which improves the energy absorption effect and further enhances the working reliability of the battery device 100.

[0107] Alternatively, if the protrusion 5 is solid, a better supporting effect can be achieved between the first main body 1 and the reinforcing plate 2.

[0108] In some embodiments, the plurality of protrusions 5 are integrally formed with the reinforcing plate 2.

[0109] For example, the protrusion 5 and the reinforcing plate 2 can be integrated into a single structure through machining, casting, stamping, or other methods.

[0110] In this embodiment, multiple protrusions 5 and reinforcing plate 2 are integrally formed, which can simplify the assembly difficulty of cover 10, improve the connection reliability of protrusions 5 and reinforcing plate 2, and facilitate the first main body 1 to be close to the original cover structure. It is only necessary to provide the component formed by reinforcing plate 2 and protrusions 5 on the surface of the first main body 1 facing the box assembly 100'.

[0111] In some embodiments, a plurality of protrusions 5 are integrally formed with one of the reinforcing plate 2 and the first main body 1, and the plurality of protrusions 5 are bonded to the other of the reinforcing plate 2 and the first main body 1.

[0112] For example, multiple protrusions 5 are integrally formed with the reinforcing plate 2, and during assembly, the protrusions 5 are connected to the first main body 1 by an adhesive. Figure 6As shown, multiple protrusions 5 are spaced apart along the first direction x, and each protrusion 5 extends along the second direction y. Multiple adhesive strips 6 are spaced apart along the second direction y on the first main body 1. The extension direction of the adhesive strips 6 is perpendicular to the extension direction of the protrusions 5. The adhesive strips 6 can extend along the first direction x, and each adhesive strip 6 can cover all the protrusions 5.

[0113] Alternatively, multiple protrusions 5 are integrally formed with the first main body 1, and during assembly, the protrusions 5 are connected to the reinforcing plate 2 by an adhesive.

[0114] This embodiment simplifies the assembly of the cover 10 by integrally molding multiple protrusions 5 with one of the reinforcing plate 2 and the first main body 1, thereby improving the connection reliability between the protrusions 5 and the reinforcing plate 2. This allows the protrusions 5 to provide stable support for the cover 10 and increase structural rigidity. Furthermore, the bonding of multiple protrusions 5 with the other of the reinforcing plate 2 and the first main body 1 improves the reliability of the direct connection between the two-layer structure during assembly, preventing positional misalignment and better leveraging the increased rigidity and enhanced energy absorption effect.

[0115] In some embodiments, such as Figure 8 As shown, the cover 10 also includes a second main body 7, which abuts against the reinforcing plate 2 on the side away from the first main body 1 along the thickness direction z of the cover 10; wherein the second main body 7 and the first main body 1 are connected.

[0116] For example, the first main body 1 and the second main body 7 can be made of metal or composite materials. For example, the second main body 7 can be a plate-like structure.

[0117] For example, the first main body 1 and the second main body 7 can be made of composite materials, and the reinforcing plate 2 can be made of metal.

[0118] This embodiment allows the reinforcing plate 2 and multiple protrusions 5 to be clamped and fixed between the first main body 1 and the second main body 7, reliably limiting and constraining the reinforcing plate 2, preventing misalignment under vibration and impact conditions, and making it less prone to detachment, thus improving the structural stability of the cover 10. Furthermore, this three-layer structure of the cover 10 further enhances its rigidity and deformation resistance, preventing impact on the internal battery cells 30 and improving the operational reliability of the battery device 100. Additionally, this structure facilitates the use of composite materials in the first main body 1 and the second main body 7, achieving weight reduction while increasing the rigidity of the cover 10.

[0119] In some embodiments, the second body portion 7 is made of an insulating material.

[0120] In this embodiment, the second main body 7 near the battery cell 30 is made of an insulating material, forming a reliable insulating layer between the cover 10 and the battery cell 30. This prevents the risk of short circuits or leakage between the battery cell 30 and the cover 10, improving the insulation reliability of the battery device 100. Moreover, it eliminates the need for an additional insulating layer between the cover 10 and the battery cell 30, simplifying the structural complexity of the battery device 100.

[0121] In some embodiments, the battery device 100 further includes a battery assembly disposed within the housing assembly 100' and comprising:

[0122] Multiple battery cells 30, each battery cell 30 including an electrode terminal 301 disposed toward the cover 10; and

[0123] The busbar 40 is configured to electrically connect the electrode terminals 301 corresponding to different battery cells 30.

[0124] In this configuration, multiple battery cells 30 are arranged side-by-side along at least one of the first directions x and y. A busbar 40 is used to connect the electrode terminals 301 of different battery cells 30, such as the electrode terminals 301 of adjacent battery cells 30, to achieve series, parallel, or mixed connection of multiple battery cells 30 to achieve the required voltage and capacity. The busbar 40 may be made of copper or aluminum.

[0125] This embodiment takes into account the small gap between the cover 10 and the top of the battery assembly. When the electrode terminals 301 of the battery cell 30 are facing upwards, the impact force will be transmitted to the busbar 40 and the electrode terminals 301 when the cover 10 is impacted. This can easily cause the busbar 40 and the electrode terminals 301 to deform or misalign, resulting in welding failure between them. Alternatively, when the pressure relief component (e.g., the explosion-proof valve) of the battery cell 30 is also facing the cover 10, the pressure relief component can easily fail under the squeezing action of the deformed cover 10, leading to the risk of thermal runaway.

[0126] Optionally, the battery cell 30 is installed upside down, and the electrode terminal 301 is positioned along the thickness direction z towards the bottom of the housing 20.

[0127] By employing the cover 10 of the above embodiment, the cover 10 has high structural rigidity. When subjected to long-term vibration or impact, or severe impact, the deformation of the cover 10 can be reduced. Even if deformation occurs, the cavity 3 can act as a buffer to absorb energy, effectively weakening the force transmitted to the busbar 40 and electrode terminals 301, preventing electrical connection failure between the busbar 40 and electrode terminals 301. Alternatively, when the pressure relief component (e.g., an explosion-proof valve) of the battery cell 30 is also positioned towards the cover 10, pressure relief component failure can be prevented, reducing the risk of thermal runaway. Therefore, the reliability of the battery device 100 can be improved, thus adapting to the needs of more severe operating conditions.

[0128] In some embodiments, such as Figure 3 As shown, the battery device 100 of the above embodiment is used for electrical equipment, including a vehicle. The vehicle includes a vehicle floor 203, on which an opening 204 is provided. The cover 10 is located in the opening 204 and is part of the vehicle floor 203.

[0129] The vehicle floor 203 is the main bottom support structure for the passenger and driver's cabin. An opening 204 matching the shape and size of the cover 10 can be provided on the vehicle floor 203. For example, the opening 204 is rectangular. The cover 10 is embedded in the opening 204, and the top of the cover 10 is flush with the rest of the vehicle floor 203. Thus, the cover 10 and the rest of the vehicle floor 203 together form the vehicle floor 203.

[0130] In this embodiment, the cover 10 of the battery device 100 is placed inside the opening 204 and is part of the vehicle floor 203. This reduces the space occupied by the battery device 100 in the height direction z when it is installed in the vehicle. Given a fixed installation height, this helps to increase the power of the battery device 100. Given a fixed height dimension of the battery device 100, this saves installation space in the vehicle.

[0131] With this installation method of the battery device 100, since the cover 10 is part of the vehicle floor 203, it will be subjected to trampling or severe impacts for a long time. The cover 10 of the battery device 100 of this application has superior structural rigidity, which can reduce the degree of deformation of the cover 10 when subjected to impact. Even if deformation occurs, the cavity 3 can also act as a buffer to absorb energy, effectively weakening the force transmitted to the busbar 40 and the electrode terminal 301, preventing the electrical connection between the busbar 40 and the electrode terminal 301 from failing. Alternatively, when the pressure relief component (such as the explosion-proof valve) of the battery cell 30 is also set towards the cover 10, it can also prevent the pressure relief component from failing. As a result, the reliability of the battery device 100 can be improved, thereby adapting to the needs of use in more severe operating conditions.

[0132] In some specific embodiments, such as Figures 4 to 7 As shown, the battery device 100 includes a housing assembly 100' and a battery assembly. The housing assembly 100' includes a cover 10 and a housing 20. The battery assembly is disposed within the housing assembly 100' and includes a plurality of battery cells 30. An insulating element may be provided between the battery assembly and the cover 10 for electrical isolation and thermal protection, preventing short circuits between the battery assembly and the cover 10. For example, the insulating element may be made of foam, which provides cushioning and accommodates the expansion of the battery cells 30.

[0133] For example, the housing 20 is typically made of high-strength aluminum alloy or steel. The bottom of the housing 20 is usually designed with anti-collision beams or reinforcing ribs to improve overall rigidity and protect the internal battery cells 30 in extreme situations (such as vehicle collisions). The cover 10 closes the opening of the housing 20. The cover 10 and the housing 20 are connected by fasteners such as bolts to form a sealed cavity to ensure the protection level.

[0134] The cover 10 includes a first main body 1 and a reinforcing plate 2. The reinforcing plate 2 is disposed on the side of the first main body 1 facing the interior of the housing assembly 100'. Two reinforcing plates 2 are spaced apart along a first direction x on the inner surface of the first main body 1. Each reinforcing plate 2 has multiple protrusions 5 integrally formed on its surface facing the first main body 1. The multiple protrusions 5 are spaced apart along the first direction x, and each protrusion 5 extends continuously along a second direction y to form a strip structure. Multiple adhesive strips 6 are spaced apart along the second direction y on the surface of the first main body 1 facing the reinforcing plate 2. The adhesive strips 6 extend along the first direction x and their length covers all the protrusions 5 to bond all the protrusions 5 to the first main body 1. A cavity 3 is formed between the first main body 1, the reinforcing plate 2, and the adjacent protrusions 5. The cavity 3 can play a role in buffering and absorbing energy.

[0135] Furthermore, the reinforcing plate 2 is provided with an injection hole 21 between adjacent protrusions 5 for injecting liquid material into the cavity 3 and forming a buffer part 4 after solidification. The buffer part 4 can provide better support for the reinforcing plate 2 and the first main body 1, improve the structural stability of the cover 10, and the buffer part 4 can also play a role in buffering and absorbing energy.

[0136] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, Includes a housing assembly (100'), the housing assembly (100') including a cover (10), the cover (10) including: First main body (1); A reinforcing plate (2) is provided on the side of the first main body (1) facing the interior of the housing assembly (100'); Multiple protrusions (5) are located between the reinforcing plate (2) and the first main body (1), and the protrusions (5) abut against the first main body (1) to form a cavity (3) between the reinforcing plate (2), the first main body (1), and the adjacent protrusions (5); and Buffer section (4), which fills the cavity (3).

2. The battery device according to claim 1, characterized in that, The buffer section (4) includes foam material.

3. The battery device according to claim 1, characterized in that, An injection hole (21) is provided on at least one of the first main body (1) and the reinforcing plate (2), and the injection hole (21) forms a channel for injecting liquid material into the cavity (3) to form the buffer part (4).

4. The battery device according to any one of claims 1 to 3, characterized in that, It includes a plurality of the reinforcing plates (2), which are arranged side by side along at least one of a first direction (x) and a second direction (y), the first direction (x) and the second direction (y) being at an angle and both being perpendicular to the thickness direction (z) of the cover (10).

5. The battery device according to any one of claims 1 to 3, characterized in that, The plurality of protrusions (5) are spaced apart along a first direction (x), and each of the protrusions (5) extends along a second direction (y), the first direction (x) being at an angle to the second direction (y), and both being perpendicular to the thickness direction (z) of the cover (10).

6. The battery device according to claim 5, characterized in that, The reinforcing plate (2) has a plurality of recesses along the thickness direction (z) of the cover (10) away from the first main body (1), and the plurality of recesses are provided in correspondence with the plurality of protrusions (5), and the recesses extend into the protrusions (5).

7. The battery device according to any one of claims 1 to 3, characterized in that, The plurality of protrusions (5) are integrally formed with the reinforcing plate (2).

8. The battery device according to any one of claims 1 to 3, characterized in that, The plurality of protrusions (5) are integrally formed with one of the reinforcing plate (2) and the first main body (1), and the plurality of protrusions (5) are bonded to the other of the reinforcing plate (2) and the first main body (1).

9. The battery device according to any one of claims 1 to 3, characterized in that, The cover (10) also includes: The second main body (7) abuts against the reinforcing plate (2) on the side away from the first main body (1) along the thickness direction (z) of the cover (10); The second main body part (7) is connected to the first main body part (1).

10. The battery device according to claim 9, characterized in that, The second main body (7) is made of insulating material.

11. The battery device according to any one of claims 1 to 3, characterized in that, It also includes a battery assembly disposed within the housing assembly (100') and comprising: Multiple battery cells (30), each battery cell (30) including an electrode terminal (301) disposed facing the cover (10); and The busbar (40) is configured to electrically connect the electrode terminals (301) corresponding to different battery cells (30).

12. An electrical appliance, characterized in that, Includes the battery device (100) according to any one of claims 1 to 11, the battery device (100) being used to provide electrical energy to the electrical equipment.

13. The electrical equipment according to claim 12, characterized in that, The electrical equipment includes a vehicle, the vehicle including a vehicle floor (203) having an opening (204) on the vehicle floor (203), and the cover (10) being located within the opening (204) and being part of the vehicle floor (203).

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