Battery device and electric device

Abstract

The application discloses a battery device and an electric device. The battery device comprises a battery monomer assembly and a box body. The box body has a containing cavity. The battery monomer assembly is located in the containing cavity. The box body comprises a bottom guard plate. The bottom guard plate is located at the bottom of the battery monomer assembly. The bottom guard plate comprises a first plate body, a second plate body and an elastic structure. The elastic structure is connected between the first plate body and the second plate body. In a first direction, the elastic structure comprises multiple layers of support plates which are sequentially connected. Multiple cavities are formed in each layer of support plates. According to the battery device, the bottom guard plate comprises the first plate body, the elastic structure and the second plate body which are sequentially stacked in the first direction. The elastic structure can increase the rigidity of the bottom guard plate. The elastic structure comprises multiple layers of support plates which are sequentially connected. Multiple cavities are formed in each layer of support plates. The multiple cavities can absorb the bottom impact force, so as to improve the bottom ball impact resistance of the bottom guard plate.

Description

Technical Field

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

[0002] With the continuous requirements for weight reduction and energy density improvement in battery devices, the bottom cover plate of the battery device is improved to a certain extent through structural optimization and material selection. Further improvement of the bottom cover plate's spherical bearing capacity is generally achieved by either increasing the strength of the bottom cover plate material or increasing the thickness of the bottom cover plate. However, the strength of the bottom cover plate material is basically fixed. In addition, the increase in material strength is accompanied by a decrease in plasticity, which has a certain impact on the performance and processing performance of the bottom cover plate. Utility Model Content

[0003] This application aims to at least solve one of the technical problems existing in the prior art. To this end, one object of this application is to provide a battery device in which the bottom guard plate is provided with an elastic structure that can absorb the bottom impact force, thereby improving the bottom guard plate's resistance to bottom ball impacts.

[0004] This application also proposes an electrical device having the above-mentioned battery device.

[0005] According to a first aspect of this application, a battery device includes: a battery cell assembly; a housing having a receiving cavity inside the housing, the battery cell assembly being located within the receiving cavity, the housing including a bottom protective plate located at the bottom of the battery cell assembly; wherein the bottom protective plate includes a first plate, a second plate, and an elastic structure, the elastic structure being connected between the first plate and the second plate, and in a first direction, the elastic structure including multiple layers of sequentially connected support plates, each layer of the support plate having multiple cavities formed within it.

[0006] According to the battery device of this application, the bottom protection plate includes a first plate, an elastic structure and a second plate stacked sequentially along a first direction. The elastic structure can increase the rigidity of the bottom protection plate. The elastic structure includes multiple layers of support plates connected in sequence. Each support plate has multiple cavities formed in it. The multiple cavities can absorb the bottom impact force to improve the bottom protection plate's ability to resist bottom ball impact. In addition, the multiple cavities can also disperse local pressure and reduce the local stress concentration of the bottom protection plate.

[0007] In some embodiments, the multilayer support plate includes at least one first support plate and / or at least one second support plate, wherein the cavity of the first support plate extends along a first direction and the cavity of the second support plate extends along a second direction, wherein the first direction is perpendicular to the second direction.

[0008] This embodiment provides a multi-layer support plate, including at least one first support plate and / or at least one second support plate. The cavity of the first support plate extends along a first direction and can absorb the impact force from the first direction. The cavity of the second support plate extends along a second direction and can absorb the impact force from the second direction. By arranging the cavities of the support plates in different directions, the impact force on the battery device from different directions can be absorbed.

[0009] In some embodiments, the elastic structure includes multiple layers of the first support plate, with at least a portion of the cavities of adjacent layers of the first support plate being staggered.

[0010] This embodiment, by setting at least a partial staggered arrangement of the cavities of the first support plates of two adjacent layers, can not only increase the structural strength of the bottom protective plate, but also effectively disperse energy and reduce the risk of direct force transmission to the battery cell assembly.

[0011] In some embodiments, the elastic structure includes multiple layers of the second support plate, with at least a portion of the cavities of adjacent layers of the second support plate being staggered.

[0012] This embodiment, by setting at least a partial misalignment of the cavities of the two adjacent second support plates, can not only increase the structural strength of the bottom protective plate, but also effectively disperse energy and reduce the risk of direct force transmission to the battery cell assembly.

[0013] In some embodiments, the multi-layered support plate includes multiple layers of the first support plate and multiple layers of the second support plate, which are arranged alternately along a first direction.

[0014] This embodiment uses a multi-layer support plate, including multiple first support plates and multiple second support plates, which are arranged alternately along a first direction. This allows the cavities of adjacent support plates to extend in different directions, providing uniform and effective buffer protection in different directions to cope with stress or impact from different angles.

[0015] In some embodiments, each layer of the support plate is formed with a plurality of elastic units, each elastic unit having a cavity formed therein, and two adjacent elastic units are arranged in abutment.

[0016] In this embodiment, by setting two adjacent elastic units in an abutting arrangement, when the support plate is subjected to local impact, a corresponding elastic unit responds to absorb and disperse the impact force.

[0017] In some embodiments, each of the elastic units includes a plurality of support ribs, which are connected end to end to form the cavity, and the pattern they enclose is a polygon.

[0018] In this embodiment, the polygonal shape formed by connecting multiple support ribs end to end allows the elastic unit to be elastic in different directions, which helps to disperse stress and improve the overall stability and compressive strength of the structure.

[0019] In some embodiments, the elastic unit includes a honeycomb elastic unit.

[0020] This embodiment incorporates honeycomb elastic units as elastic elements. These honeycomb elastic units possess excellent compressive strength and energy absorption capabilities. When subjected to external forces, they can effectively distribute energy throughout the entire structure, reducing localized stress concentration and thus protecting the battery cell assembly from impact damage.

[0021] In some embodiments, the elastic structure further includes a filler that fills the cavity within at least one layer of the support plate.

[0022] This embodiment maximizes the use of the battery device space in the first direction by setting the filler to fill the cavity of at least one layer of support plate, and can effectively improve the bottom protection plate's resistance to bottom balls.

[0023] In some embodiments, the filler includes structural adhesive or foam.

[0024] This embodiment uses fillers, including structural adhesive or foam, to give the bottom protection plate good energy absorption and cushioning performance.

[0025] In some embodiments, the first plate is an integrally formed metal plate or a composite material plate.

[0026] In this embodiment, by setting the first plate as an integrally formed metal plate or composite material plate, the first plate can be constructed according to actual needs to meet different requirements.

[0027] In some embodiments, the second plate is an integrally formed metal plate or a composite material plate.

[0028] In this embodiment, by setting the second plate to be a one-piece molded metal plate or composite material plate, the second plate can be constructed according to actual needs to meet different requirements.

[0029] The power supply device according to the second aspect of this application includes: the battery device according to the first aspect of this application.

[0030] According to the electrical device of this application, the improved performance of the battery device is beneficial to improving the electrical performance of the electrical device.

[0031] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0032] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0033] Figure 1 These are schematic diagrams of vehicles according to some embodiments of this application;

[0034] Figure 2 This is a partial schematic diagram of a battery device according to some embodiments of this application;

[0035] Figure 3 This is a top view of a support plate according to some embodiments of this application;

[0036] Figure 4 yes Figure 3 Sectional view along line AA;

[0037] Figure 5 This is a top view of a support plate according to other embodiments of this application;

[0038] Figure 6 yes Figure 5 Sectional view along the BB line;

[0039] Figure 7 This is a side view of a support plate according to some embodiments of this application;

[0040] Figure 8 This is a side view of a support plate according to some embodiments of the present application.

[0041] Figure label:

[0042] 100. Vehicle; 101. Battery unit; 102. Controller; 103. Motor;

[0043] 10. Battery cell modules;

[0044] 20. Bottom protective plate; 21. First plate; 22. Second plate; 23. Elastic structure; 231. First support plate; 232. Second support plate; 233. Elastic unit; 234. Cavity; 235. Support rib. Detailed Implementation

[0045] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0046] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0047] In the description of this application, it should 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0048] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0049] With the continuous requirements for weight reduction and energy density improvement in battery devices, the bottom cover of the battery device has been improved to a certain extent through structural optimization and material selection. To further improve the bottom spherical strength of the bottom cover, it is generally necessary to either increase the strength of the bottom cover material or increase the thickness of the bottom cover. However, the strength of the bottom cover material is basically fixed. In addition, the increase in material strength is accompanied by a decrease in plasticity, which has a certain impact on the performance and processing performance of the bottom cover.

[0050] Based on the above considerations, this application proposes a battery device, which includes a bottom protective plate. The bottom protective plate includes a first plate and a second plate. An elastic structure is provided between the first plate and the second plate. The elastic structure includes multiple layers of support plates connected in sequence. Each support plate has multiple cavities. The arrangement of the multiple cavities can absorb the bottom impact force to improve the bottom protective plate's resistance to bottom ball impacts. In addition, the multiple cavities can also disperse local pressure and reduce the local stress concentration of the bottom protective plate.

[0051] The battery device disclosed in this application can be used in electrical devices that use the battery device as a power source or in various energy storage systems that use the battery device as an energy storage element. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0052] For ease of explanation, the following embodiments use a vehicle 100 as an example of an electrical device according to an embodiment of this application. The vehicle 100 can be a new energy vehicle, such as a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle. A battery device 101 is installed inside the vehicle 100, and the battery device 101 can be located at the bottom, front, or rear of the vehicle 100. The battery device 101 can be used to supply power to the vehicle 100; for example, the battery device 101 can serve as the operating power source for the vehicle 100. The vehicle 100 may also include a controller 102 and a motor 103. The controller 102 controls the battery device 101 to supply power to the motor 103, for example, to meet the power needs of the vehicle 100 during starting, navigation, and driving.

[0053] In some embodiments of this application, the battery device 101 can not only serve as the operating power source for the vehicle 100, but also as the driving power source for the vehicle 100, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 100.

[0054] Figure 2 This is a partial schematic diagram of a battery device according to an embodiment of this application. The battery device 101 includes a housing and a battery cell assembly 10. The housing itself forms a receiving cavity, and the battery cell assembly 10 is disposed in the receiving cavity. The housing includes a bottom protective plate 20, which is located at the bottom of the battery cell assembly 10. The housing is used to provide receiving space for the battery cell assembly 10.

[0055] For example, in the battery device 101, the battery cell assembly 10 includes multiple battery cells, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that some battery cells are connected in series while others are in parallel. The multiple battery cells can be directly connected in series, parallel, or in a mixed manner, and then the battery cell assembly is housed within a receiving cavity. Alternatively, the battery device 101 can also be a module composed of multiple battery cells first connected in series, parallel, or in a mixed manner, and then these modules are connected in series, parallel, or in a mixed manner to form a whole, which is then housed within a receiving cavity. The battery device 101 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells.

[0056] Each battery cell can be a secondary or primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell can be flat, rectangular, or other shapes.

[0057] Figure 3 This is a top view of a support plate according to some embodiments of this application. Figure 4 yes Figure 3 Sectional view along line AA in the middle. Figure 5 This is a top view of a support plate according to other embodiments of this application. Figure 6 yes Figure 5 Sectional view along line BB. Figure 7 This is a side view of a support plate according to some embodiments of this application. Figure 8 This is a side view of a support plate according to some embodiments of the present application.

[0058] According to the first aspect of this application, the battery device 101 includes: a battery cell assembly 10; a housing having a receiving cavity inside the housing, the battery cell assembly 10 being located inside the receiving cavity, the housing including a bottom protective plate 20 located at the bottom of the battery cell assembly 10; wherein, the bottom protective plate 20 includes a first plate 21, a second plate 22 and an elastic structure 23, the elastic structure 23 being connected between the first plate 21 and the second plate 22, and in a first direction, the elastic structure 23 including multiple layers of support plates connected in sequence, each support plate having multiple cavities 234 formed therein.

[0059] For example, the battery cell assembly 10 is located within the housing cavity of the enclosure. The enclosure provides support or protection for the battery cell assembly 10, preventing water or dust from the external environment from entering the battery cell assembly 10 and affecting its performance. The enclosure includes a bottom protective plate 20, which is located at the bottom of the battery cell assembly 10. The bottom protective plate 20 is part of the enclosure and provides support for it. The structure of the bottom protective plate 20 determines the battery device 101's resistance to bottom impacts.

[0060] In this application, the first direction (see Appendix) Figure 2 The Z-direction in the diagram represents the vertical direction, and the second direction (see attached diagram) represents the vertical direction. Figure 3 The Y direction in the figure refers to either the left-right direction or the front-back direction.

[0061] The bottom protection plate 20 includes a first plate 21, a second plate 22, and an elastic structure 23. In a first direction, the first plate 21, the elastic structure 23, and the second plate 22 are stacked sequentially. The first plate 21 can be positioned closer to the battery cell assembly 10, and the second plate 22 closer to the ground; alternatively, the second plate 22 can be positioned closer to the battery cell assembly 10, and the first plate 21 closer to the ground. The elastic structure 23 is sandwiched between the first plate 21 and the second plate 22. The elastic structure 23 increases the overall rigidity of the bottom protection plate 20, reduces the bending amount of the bottom protection plate 20, and improves the flatness of the bottom protection plate 20, thereby improving the bottom protection plate 20's ability to withstand bottom ball impacts and further enhancing the reliability of the bottom protection plate 20 during long-term use.

[0062] The elastic structure 23 includes multiple support plates stacked sequentially along a first direction, and the multiple support plates are connected sequentially along the first direction. The multiple support plates are two or more layers of support plates. Each support plate has multiple cavities 234 formed in it. The cavity 234 in one support plate can penetrate the support plate along the first direction, and the cavity 234 in another support plate can penetrate the support plate along the second direction. Alternatively, some cavities 234 in one support plate can penetrate the support plate along the first direction, and other cavities 234 can penetrate the support plate along the second direction.

[0063] When the battery device 101 is hit by a ball from the bottom, the cavity 234 in the support plate near the bottom can absorb part of the impact force from the bottom of the battery device 101, and the remaining impact force can be dispersed into the cavity 234 in the support plate near the battery cell assembly 10. By setting the support plate to multiple layers, the bottom impact force can be absorbed by the cavity 234 of the support plate, thereby reducing the impact force transmitted to the battery cell assembly 10.

[0064] In addition, when the bottom cover plate 20 of the battery device 101 is subjected to external pressure (such as squeezing during installation, vibration in the use environment, etc.), the multiple cavities 234 can also disperse local pressure and reduce local stress concentration.

[0065] According to the battery device 101 of this application, the bottom protection plate 20 includes a first plate 21, an elastic structure 23 and a second plate 22 stacked sequentially along a first direction. The elastic structure 23 can increase the rigidity of the bottom protection plate 20. The elastic structure 23 includes multiple layers of support plates connected in sequence. Each support plate has multiple cavities 234 formed in it. The multiple cavities 234 can absorb the bottom impact force to improve the bottom protection plate 20's ability to resist bottom ball impact. In addition, the multiple cavities 234 can also disperse local pressure and reduce the local stress concentration of the bottom protection plate 20.

[0066] In some embodiments, such as Figures 2-8 As shown, the multi-layer support plate includes at least one first support plate 231 and / or at least one second support plate 232. The cavity 234 of the first support plate 231 extends along a first direction, and the cavity 234 of the second support plate 232 extends along a second direction. The first direction is perpendicular to the second direction.

[0067] For example, a multi-layer support plate may include at least one first support plate 231, with the cavity 234 of the first support plate 231 extending along a first direction; the multi-layer support plate may include one first support plate 231, or the multi-layer support plate may include multiple first support plates 231. Alternatively, a multi-layer support plate may include at least one second support plate 232, with the cavity 234 of the second support plate 232 extending along a second direction; the multi-layer support plate may include one second support plate 232, or the multi-layer support plate may include multiple second support plates 232. Furthermore, a multi-layer support plate may include at least one first support plate 231 and at least one second support plate 232; it may also include one first support plate 231 and one second support plate 232, or it may include multiple first support plates 231 and multiple second support plates 232.

[0068] The cavity 234 of the first support plate 231 extends along a first direction, giving the bottom protective plate 20 high rigidity and good energy absorption, making it suitable for high-energy impacts. The cavity 234 of the first support plate 231, extending along the first direction, can absorb impact forces from that direction. The cavity 234 of the second support plate 232 extends along a second direction, giving the bottom protective plate 20 high elasticity and resilience, resulting in good energy absorption and suitability for low-energy impacts. The cavity 234 of the second support plate 232, extending along the second direction, can absorb impact forces from that direction. Arranging the cavities 234 of the support plates in different directions allows for the absorption of impact forces on the battery device 101 from different directions.

[0069] The support plate is divided into a first support plate 231 and a second support plate 232 according to the different extension directions of the cavity 234. The first support plate 231 and the second support plate 232 can be combined to form different bottom protection plate 20 structures according to the different structures of the battery device 101, so as to cope with different battery devices 101.

[0070] This embodiment provides a multi-layer support plate, including at least one first support plate 231 and / or at least one second support plate 232. The cavity 234 of the first support plate 231 extends along a first direction and can absorb the impact force from the first direction; the cavity 234 of the second support plate 232 extends along a second direction and can absorb the impact force from the second direction. By arranging the cavities 234 of the support plates in different directions, the impact force on the battery device 101 from different directions can be absorbed.

[0071] In some embodiments, such as Figure 2 Figure 8 As shown, the elastic structure 23 includes multiple layers of first support plates 231, and at least part of the cavities 234 of two adjacent layers of first support plates 231 are staggered.

[0072] For example, in the first direction, a portion of the cavities 234 of the first support plates 231 of two adjacent layers are staggered, with one cavity 234 of the first support plate 231 of one layer being partially opposite to one cavity 234 of the first support plate 231 of the other layer, and the other cavity 234 being opposite to another cavity 234 of the first support plate 231 of the other layer; alternatively, the cavities 234 of the first support plates 231 of two adjacent layers may be staggered, with all the cavities 234 of the first support plate 231 of one layer being opposite to the areas of the first support plate 231 of the other layer where no cavities 234 are provided.

[0073] The cavity 234 of the first support plate 231 extends along the first direction. The cavity 234 is staggered, which not only increases the structural strength of the bottom protective plate 20, but also effectively disperses energy and reduces the risk of direct force transmission to the battery cell assembly 10.

[0074] This embodiment, by setting at least a partial misalignment of the cavities 234 of the two adjacent first support plates 231, can not only increase the structural strength of the bottom protective plate 20, but also effectively disperse energy and reduce the risk of direct force transmission to the battery cell assembly 10.

[0075] In some embodiments, such as Figures 2-4 , Figures 6-7 As shown, the elastic structure 23 includes multiple layers of second support plates 232, and at least part of the cavities 234 of two adjacent layers of second support plates 232 are staggered.

[0076] For example, in the first direction, a portion of the cavities 234 of two adjacent second support plates 232 are staggered, with one cavity 234 of the second support plate 232 of one layer facing a portion of one cavity 234 of the second support plate 232 of the other layer, and the other portion of the cavities 234 facing another cavity 234 of the second support plate 232 of the other layer; alternatively, the cavities 234 of two adjacent second support plates 232 may be staggered, with all the cavities 234 of the second support plate 232 of one layer facing the area of ​​the second support plate 232 of the other layer where no cavities 234 are provided.

[0077] The cavity 234 of the second support plate 232 extends along the second direction. The cavity 234 is staggered, which not only increases the structural strength of the bottom protective plate 20, but also effectively disperses energy and reduces the risk of direct force transmission to the battery cell assembly 10.

[0078] This embodiment, by setting at least a partial misalignment of the cavities 234 of the two adjacent second support plates 232, can not only increase the structural strength of the bottom protective plate 20, but also effectively disperse energy and reduce the risk of direct force transmission to the battery cell assembly 10.

[0079] In some embodiments, such as Figures 2-8 As shown, the multi-layer support plate includes multiple first support plates 231 and multiple second support plates 232, which are arranged alternately along a first direction.

[0080] For example, the alternating arrangement of multiple layers of first support plates 231 and multiple layers of second support plates 232 along a first direction can also improve the structural strength and consistency of the bottom protective plate 20. The cavity 234 of the first support plate 231 extends along the first direction, and the cavity 234 of the second support plate 232 extends along a second direction, which allows the cavities 234 of adjacent support plates to extend in different directions, providing uniform and effective buffer protection in different directions to cope with stress or impact from different angles.

[0081] This embodiment sets up a multi-layer support plate including multiple first support plates 231 and multiple second support plates 232. The multiple first support plates 231 and multiple second support plates 232 are arranged alternately along a first direction, so that the cavities 234 of the adjacent support plates extend in different directions, which can provide uniform and effective buffer protection in different directions to cope with stress or impact from different angles.

[0082] In some embodiments, such as Figures 2-8As shown, each support plate has multiple elastic units 233, and each elastic unit 233 has a cavity 234. Two adjacent elastic units 233 are arranged in abutment.

[0083] For example, multiple elastic units 233 within each support plate are arranged in close contact. When the support plate is subjected to a local impact, a corresponding elastic unit 233 responds to absorb and disperse the impact force. The cavity 234 formed inside the elastic unit 233 not only helps to absorb the impact but also maximizes the buffering effect within a limited space, improving the efficiency of the overall structure.

[0084] In this embodiment, by setting two adjacent elastic units 233 to abut each other, when the support plate is subjected to local impact, the corresponding elastic unit 233 will respond to absorb and disperse the impact force.

[0085] In some embodiments, such as Figures 2-8 As shown, each elastic unit 233 includes multiple support ribs 235, which are connected end to end to form a cavity 234, and the shape enclosed by them is a polygon.

[0086] For example, the cavity 234 within each elastic unit 233 has a polygonal profile, and two adjacent cavities 234 can share one of the supporting ribs 235. The polygonal arrangement of the cavities 234 helps to disperse stress and improve the overall stability and compressive strength of the structure. The polygonal design of the elastic unit 233 can be elastic in different directions, effectively dispersing impact forces and protecting the battery cell assembly 10 from damage.

[0087] For example, polygons can be triangles, quadrilaterals, pentagons, or hexagons, etc.

[0088] In a specific example, by adjusting the side length and wall thickness of the support rib 235, as well as the thickness of each support plate, the structure of the elastic structure 23 can be freely adjusted, thereby achieving the ability of the bottom guard plate 20 with different elastic structures 23 to resist bottom ball impact.

[0089] In this embodiment, the polygonal shape is formed by connecting multiple support ribs 235 end to end. The elastic unit 233 with the polygonal design can be elastic in different directions, which is beneficial to disperse stress and improve the overall stability and compressive strength of the structure.

[0090] In some embodiments, such as Figure 3 , Figure 7 As shown, the elastic unit 233 includes a honeycomb elastic unit.

[0091] For example, the honeycomb elastic unit is designed to mimic the honeycomb structure found in nature, consisting of multiple hexagons connected sequentially. Each hexagon contains a cavity 234, forming a continuous and stable structure. The honeycomb elastic unit possesses excellent compressive strength and energy absorption capabilities. When subjected to external forces, it effectively disperses energy throughout the entire structure, reducing localized stress concentration and thus protecting the battery cell assembly 10 from impact damage. The uniform distribution of the cavities 234 formed by each hexagon contributes to the honeycomb elastic unit's high stability and durability, enabling it to withstand repeated pressure and vibration without easily being damaged.

[0092] In this embodiment, the elastic unit 233 includes a honeycomb elastic unit. The honeycomb elastic unit has good compressive strength and energy absorption capacity. When subjected to external force, the honeycomb elastic unit can effectively disperse energy throughout the structure, reduce local stress concentration, and thus protect the battery cell assembly 10 from impact damage.

[0093] In some embodiments, such as Figure 2 As shown, the elastic structure 23 also includes a filler that fills the cavity 234 of at least one layer of support plate.

[0094] For example, the filler can be filled in the cavity 234 of a single-layer support plate, or it can be filled in the cavity 234 of multiple support plates. The filler can be selected to fill the cavity 234 of the corresponding support plate according to actual needs. Filling the cavity 234 of at least one layer of support plate can maximize the utilization of the space of the battery device in the first direction and effectively improve the bottom protection plate 20's resistance to bottom balling. After the filler is filled into the cavity 234, it can increase the overall structural strength of the bottom protection plate 20.

[0095] For example, the filler can be a polymer material.

[0096] This embodiment maximizes the use of the space in the first direction of the battery device by setting the filler to fill the cavity 234 of at least one layer of support plate, and can effectively improve the bottom protection plate 20's resistance to bottom balls.

[0097] In some embodiments, such as Figure 2 As shown, the filler includes structural adhesive or foam.

[0098] For example, both structural adhesives and expanding foams are high-strength adhesives; structural adhesives can not only fill cavities 234, but also enhance the connection strength between multi-layer support plates, improving the integrity and stability of the entire elastic structure 23. Expanding foams expand and form a foam-like structure during curing, possessing excellent energy absorption and cushioning properties, effectively absorbing impact energy, and their lightweight properties help reduce overall weight.

[0099] This embodiment uses fillers including structural adhesive or foam to give the bottom protective plate 20 good energy absorption and cushioning performance.

[0100] In some embodiments, such as Figure 2 As shown, the first plate 21 is a one-piece molded metal plate or composite material plate.

[0101] For example, the first plate 21 is a one-piece molded metal plate. The first plate 21 is formed in one piece through metal processing technology, which gives the first plate 21 the advantages of metal materials, such as high strength, good thermal conductivity and durability. Moreover, the fact that the first plate 21 is a one-piece molded metal plate simplifies the processing of the first plate 21 and also increases the structural strength of the first plate 21.

[0102] The first plate 21 is an integrally molded composite material plate. The composite material plate can be made of various fiber materials, such as carbon fiber reinforced plastic and glass fiber reinforced plastic. Compared with metal plates, composite material plates are lighter and their physical properties such as strength, stiffness or corrosion resistance can be adjusted according to requirements to meet different application needs.

[0103] In this embodiment, the first plate 21 is set as an integrally formed metal plate or composite material plate, and the first plate 21 can be constructed according to actual needs to meet different requirements.

[0104] In some embodiments, such as Figure 2 As shown, the second plate 22 is a one-piece molded metal plate or composite material plate.

[0105] For example, the second plate 22 is a one-piece molded metal plate. The second plate 22 is formed in one piece through metal processing technology, which gives the second plate 22 the advantages of metal materials, such as high strength, good thermal conductivity and durability. Moreover, the fact that the second plate 22 is a one-piece molded metal plate simplifies the processing of the second plate 22 and also increases the structural strength of the second plate 22.

[0106] The second plate 22 is an integrally molded composite material plate. The composite material plate can be made of various fiber materials, such as carbon fiber reinforced plastic and glass fiber reinforced plastic. Compared with metal plates, composite material plates are lighter and their physical properties such as strength, stiffness or corrosion resistance can be adjusted according to requirements to meet different application needs.

[0107] In this embodiment, the second plate 22 is set as an integrally formed metal plate or composite material plate, and the second plate 22 can be constructed according to actual needs to meet different requirements.

[0108] The power supply device according to the second aspect of this application includes: the battery device 101 of the first aspect of this application.

[0109] According to the electrical device of this application, since the performance of the battery device 101 is improved, it is beneficial to improve the working power consumption performance of the electrical device.

[0110] The following will refer to Figures 1-8 A battery device 101 according to a specific embodiment of this application is described.

[0111] The battery device 101 includes a housing and a battery cell assembly 10. The housing has a receiving cavity, and the battery cell assembly 10 is located within the receiving cavity. The housing includes a bottom protective plate 20, which is located at the bottom of the battery cell assembly 10. The bottom protective plate 20 includes a first plate 21, a second plate 22, and an elastic structure 23. In the vertical direction, the elastic structure 23 connects the first plate 21 and the second plate 22. In the vertical direction, the elastic structure 23 includes multiple layers of sequentially connected support plates, each layer of support plate forming multiple cavities 234. Each layer of support plate forms multiple elastic units 233, each elastic unit 233 forming a cavity 234. Adjacent elastic units 233 are arranged in abutment. Each elastic unit 233 includes multiple support ribs 235, which are connected end to end to form a cavity 234, and the enclosed shape is a polygon.

[0112] Example 1,

[0113] The multi-layer support plate includes multiple layers of first support plates 231. The cavity 234 of the first support plate 231 extends along a first direction, and at least part of the cavities 234 of two adjacent layers of first support plates 231 are staggered. The shape formed by the connection of multiple support ribs 235 end to end is a polygon, which can be a triangle, rhombus or hexagon. The shape formed by the connection of the support ribs 235 of two adjacent layers of first support plates 231 end to end can be different or the same.

[0114] Example 2,

[0115] The multi-layer support plate includes multiple layers of second support plates 232. The cavity 234 of the second support plate 232 extends along the second direction, and at least part of the cavities 234 of adjacent layers of second support plates 232 are staggered. The pattern formed by the multiple support ribs 235 connected end to end is one of triangle, rhombus or hexagon. The pattern formed by the support ribs 235 of adjacent layers of second support plates 232 connected end to end can be different or the same.

[0116] Example 3,

[0117] The multi-layer support plate includes a first support plate 231 and a second support plate 232. The pattern formed by the multiple support ribs 235 connected end to end is one of triangle, rhombus or hexagon. The pattern formed by the multiple support ribs 235 connected end to end in the first support plate 231 and the second support plate 232 can be the same or different.

[0118] Example 4,

[0119] The multi-layer support plate includes multiple first support plates 231 and multiple second support plates 232. The multiple first support plates 231 and multiple second support plates 232 are arranged alternately along the first direction. The pattern formed by the multiple support ribs 235 connected end to end is one of triangle, rhombus or hexagon. The pattern formed by the multiple support ribs 235 connected end to end in two adjacent first support plates 231 and second support plates 232 can be the same or different.

[0120] In the above embodiments, the cavity 234 of at least one layer of the support plate is filled with adhesive or foam.

[0121] The first plate 21 can be a metal plate or a composite material plate, and the second plate 22 can also be a metal plate or a composite material plate. In the above embodiments, the first plate 21 can be a metal plate and the second plate 22 can be a composite material plate; or, the first plate 21 can be a metal plate and the second plate 22 can be a metal plate; or, the first plate 21 can be a composite material plate and the second plate 22 can be a metal plate; or, the first plate 21 can be a composite material plate and the second plate 22 can be a composite material plate.

[0122] In the description of this specification, references to terms such as "some embodiments," "optionally," "furthermore," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0123] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery device (101), characterized in that, include: Battery cell assembly (10); The housing has a receiving cavity, the battery cell assembly (10) is located in the receiving cavity, and the housing includes a bottom protective plate (20) located at the bottom of the battery cell assembly (10); The bottom protective plate (20) includes a first plate (21), a second plate (22) and an elastic structure (23). The elastic structure (23) is connected between the first plate (21) and the second plate (22). In a first direction, the elastic structure (23) includes multiple layers of support plates connected in sequence, and each layer of the support plate has multiple cavities (234).

2. The battery device (101) according to claim 1, characterized in that, The multi-layered support plate includes at least one first support plate (231) and / or at least one second support plate (232), the cavity (234) of the first support plate (231) extends along a first direction, the cavity (234) of the second support plate (232) extends along a second direction, and the first direction is perpendicular to the second direction.

3. The battery device (101) according to claim 2, characterized in that, The elastic structure (23) includes multiple layers of the first support plate (231), with at least a portion of the cavities (234) of two adjacent layers of the first support plate (231) being staggered.

4. The battery device (101) according to claim 2, characterized in that, The elastic structure (23) includes multiple layers of the second support plate (232), with at least a portion of the cavities (234) of two adjacent layers of the second support plate (232) being staggered.

5. The battery device (101) according to claim 2, characterized in that, The multi-layered support plate includes multiple layers of the first support plate (231) and multiple layers of the second support plate (232), which are arranged alternately along a first direction.

6. The battery device (101) according to claim 2, characterized in that, Each layer of the support plate has a plurality of elastic units (233), and each elastic unit (233) has a cavity (234) formed therein, with two adjacent elastic units (233) arranged in abutment.

7. The battery device (101) according to claim 6, characterized in that, Each of the elastic units (233) includes a plurality of support ribs (235), which are connected end to end to form the cavity (234), and the pattern they enclose is a polygon.

8. The battery device (101) according to claim 6, characterized in that, The elastic unit (233) includes a honeycomb elastic unit.

9. The battery device (101) according to claim 1, characterized in that, The elastic structure (23) further includes a filler that fills the cavity (234) of at least one layer of the support plate.

10. The battery device (101) according to claim 9, characterized in that, The filler includes structural adhesive or foam.

11. The battery device (101) according to claim 1, characterized in that, The first plate (21) is an integrally formed metal plate or composite material plate.

12. The battery device (101) according to claim 1, characterized in that, The second plate (22) is an integrally formed metal plate or composite material plate.

13. An electrical appliance, characterized in that, include: The battery device (101) according to any one of claims 1-12.

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