Battery device and electric device

Abstract

A battery device and an electric device belong to the technical field of batteries. The battery device comprises a battery monomer and a box body. The box body comprises a cover body and a basin body. The cover body is arranged on the basin body and forms a containing cavity for containing the battery monomer. The basin body is integrally formed with a bottom structure and a side structure. The side structure is arranged around the bottom structure and forms a containing groove with the bottom structure for containing the battery monomer. The battery monomer is carried on the bottom structure. The box body further comprises a protective plate. The protective plate is located on the side of the bottom structure away from the containing groove. The protective plate comprises a connecting portion and a protective portion. The connecting portion is fusion connected with the bottom structure. The protective portion and the bottom structure form a cavity therebetween. The cavity is used for absorbing at least part of external impact. The manufacturing process of the battery device is less and the manufacturing cost is lower.

Description

Technical Field

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

[0002] In related technologies, the battery pack housing structure requires the installation of an independent bottom protective plate. The bottom protective plate is connected to the lower housing of the battery pack via rivet nuts to improve bottom performance. The bottom protective plate needs to be separately electrophoretically coated and sprayed with PVC before being locked onto the bottom surface of the lower housing. Since the lower housing needs to have mounting holes for the rivet nuts to pass through, sealant also needs to be applied around the bottom surface of the lower housing during installation to ensure its sealing performance. This results in high housing manufacturing costs and complex manufacturing processes. Utility Model Content

[0003] This application provides a battery device and an electrical device, wherein the battery device has fewer manufacturing steps and lower manufacturing costs.

[0004] In a first aspect, embodiments of this application provide a battery device, including a battery cell and a housing. The housing includes a cover and a basin. The cover covers the basin and forms a receiving cavity for accommodating the battery cell. The basin is integrally formed with a bottom structure and a side structure. The side structure is arranged around the bottom structure and forms a receiving groove with the bottom structure for accommodating the battery cell. The battery cell is supported by the bottom structure.

[0005] The enclosure also includes a protective plate located on the side of the bottom structure opposite to the receiving groove. The protective plate includes a connecting part and a protective part. The connecting part is fused to the bottom structure, and a cavity is formed between the protective part and the bottom structure. The cavity is used to absorb at least part of the external impact.

[0006] In the above technical solution, the protective plate and the basin are welded together, which can reduce the processes of electrophoresis and PVC spraying of the protective plate, the opening process of the box and the sealing glue application process, simplifying the production process of the box, reducing the use of manual labor, improving automation efficiency and reducing production costs; the connection between the connecting part and the bottom structure is fused together, which can increase the usable space of the accommodating slot, thereby helping to reduce the size of the battery device or increase the energy density of the battery device; when the protective part is subjected to external impact, the protective part can deform to one side of the cavity. Due to the existence of the cavity, the impact force on the protective part will not immediately act directly on the bottom structure, thereby helping to reduce the risk of the battery cell being subjected to external impact.

[0007] In some embodiments of this application, the protective plate includes at least one protective portion, the protective portion having at least one opening that communicates with the cavity.

[0008] In the above technical solution, by setting an opening on the protective part, the opening is connected to the cavity. When the box is surface treated, the surface treatment liquid can enter the cavity through the opening, so as to perform surface treatment on the wall surface of the box used to define the cavity, so that the wall surface of the box used to define the cavity can also form a surface treatment layer.

[0009] In some embodiments of this application, a portion of the edge of the protective plate is spaced apart from the bottom structure to form the opening.

[0010] In the above technical solution, the edge of the protective plate is separated from the bottom structure to form an opening. On the one hand, the surface treatment liquid can enter the cavity from the opening and be drained from the cavity as soon as possible, reducing the possibility of surface treatment liquid remaining in the cavity, so as to obtain a good surface treatment effect, such as electrophoresis effect. On the other hand, the setting of the opening has little impact on the structural strength of the protective plate.

[0011] In some embodiments of this application, the dimension of the bottom structure in the first direction is larger than the dimension of the bottom structure in the second direction, and the openings are formed on both sides of the protective plate in the second direction.

[0012] In the above technical solution, the openings are formed on both sides of the protective plate along the second direction. In this way, once the protective plate is immersed in the electrophoresis liquid, the electrophoresis liquid can enter the cavity through the lower opening, and the gas in the cavity can be discharged through the upper opening. When the basin and the protective plate are removed from the electrophoresis liquid along the second direction, the excess electrophoresis liquid will be discharged from the opening as much as possible, reducing the possibility of electrophoresis liquid remaining in the cavity, so as to obtain a good electrophoresis effect.

[0013] In some embodiments of this application, the protective part has a through hole, which is formed as the opening.

[0014] In the above technical solution, the surface treatment liquid can enter the cavity through the through hole, so that the wall surface of the box used to form the cavity can also form an electrophoretic layer; multiple through holes can be conveniently provided to increase the speed at which the surface treatment liquid flows into the cavity.

[0015] In some embodiments of this application, the surface of the basin is provided with a surface treatment layer, and the outer surface and at least part of the inner surface of the protective plate are provided with a surface treatment layer.

[0016] In the above technical solution, by setting a surface treatment layer on the surface of the basin and the protective plate, it is beneficial to make the basin and the protective plate have better performance, such as better anti-corrosion and anti-scratch performance.

[0017] In some embodiments of this application, the surface treatment layer is an electrophoretic layer.

[0018] In the above technical solution, an electrophoretic layer is formed on the surface of the basin and the protective plate to prevent the box from rusting in humid, salt spray and other environments; the electrophoretic layer has good insulation properties, which can reduce the risk of short circuit in the battery device.

[0019] In some embodiments of this application, at least a portion of the cavity is provided with a buffer.

[0020] In the above technical solution, the combination of the buffer performance of the buffer components and the rigidity of the protective plate gives the enclosure better energy absorption capacity, which is beneficial to improving the bottom ball performance of the enclosure. When the area between adjacent buffer components of the protective plate is impacted by a bottom ball, it can absorb the impact energy of the bottom ball through its own deformation, thus meeting the bottom ball performance requirements.

[0021] In some embodiments of this application, the buffer is a foam material component.

[0022] In the above technical solution, the foamed material component has good energy absorption capacity. When subjected to impact, the foamed material component absorbs energy through elastic deformation or collapse, reducing the impact force transmitted to the battery cell. In addition, the density of foamed material is usually much lower than that of rubber or metal cushioning components, which also helps to reduce the weight of the casing.

[0023] In some embodiments of this application, the foaming temperature range of the foamed material is 170°C to 190°C.

[0024] In the above technical solution, the foaming temperature of the foamed material is close to the baking temperature of the electrophoretic paint film. Therefore, during production, unfoamed high-temperature foamable material can be placed on the basin or protective plate first. After electrophoresis is completed, during the baking process of the electrophoretic paint film, the unfoamed high-temperature foamable material simultaneously completes foaming to form foamed material, which serves as a buffer. This reduces the need for separate foaming of the unfoamed high-temperature foamable material, thus lowering production costs.

[0025] In some embodiments of this application, the foamed material is a polyurethane foamed material.

[0026] In the above technical solution, polyurethane foam material has good elasticity and oil resistance, can absorb impact energy well, and has a long service life, which can better adapt to the use scenarios of battery devices.

[0027] In some embodiments of this application, at least one of the bottom structure and the protective portion is connected to the buffer.

[0028] In the above technical solution, at least one of the bottom structure and the protective part is connected to the second buffer, so that the second buffer is not easy to shift and can be kept in the designed position to obtain a better protective effect.

[0029] In some embodiments of this application, at least one of the bottom structure and the protective portion includes a first region and a second region, the first region being connected to the buffer member, and the second region having a surface treatment layer formed thereon.

[0030] In the above technical solution, since the first region is connected to and covered by the second buffer, the first region does not need to be treated with surface treatment liquid, or the surface treatment liquid cannot reach the first region.

[0031] In some embodiments of this application, the dimension of the bottom structure in the first direction is greater than the dimension of the bottom structure in the second direction. In the first direction, the dimension of the buffer is D1, and the spacing between adjacent buffers is D2, where D1:D2 = 1:1 to 1:4.

[0032] In the above technical solution, the number of buffer components will not be too large, so as to make the cost too high, and the number of buffer components will not be too small, so as to make the anti-ball performance of the box not meet the requirements.

[0033] In some embodiments of this application, the maximum distance between the protective part and the bottom structure is L, where L = 2mm to 3mm.

[0034] In the above technical solution, the maximum distance between the protective part and the bottom structure is neither too large, which would increase the Z-axis dimension of the box excessively, nor too small, which would result in poor cushioning effect.

[0035] In some embodiments of this application, multiple connecting portions are provided, and the multiple connecting portions are spaced apart.

[0036] In the above technical solution, the connection stability between the protective plate and the bottom structure is good, and the connection process between the protective plate and the bottom structure takes less time.

[0037] In some embodiments of this application, a protective portion is provided between two adjacent connecting portions, wherein the protective plate is recessed to form the connecting portion or the bottom structure is recessed to connect with the connecting portion.

[0038] In the above technical solution, the connection part is partially recessed or the bottom structure is partially recessed. This allows the other parts of the protective plate and the bottom structure to define cavities to achieve the purpose of buffering. At the same time, the formation of the recessed part can also enhance the structural strength of the protective plate and the bottom structure.

[0039] In some embodiments of this application, the connecting portion includes a first connecting portion and a second connecting portion, wherein the first connecting portion is closer to the center of the protective plate than the second connecting portion.

[0040] In the above technical solution, by setting a first connecting part closer to the center of the protective plate, that is, the center of the protective plate is also connected to the bottom structure, the center of the protective plate can deform in tandem with the bottom structure, thereby improving the deformation resistance of the center of the protective plate and making it less prone to deformation and vibration during use. At the same time, it also ensures good dimensional stability of the cavity near the center of the protective plate, which is beneficial for obtaining good electrophoresis quality. Furthermore, the weld point formed by the welding of the first connecting part and the bottom structure has a dimension in the height direction of the battery device that is much smaller than that of the locking bolts, thus having little impact on the arrangement space of the battery cells.

[0041] In some embodiments of this application, the box body further includes a beam, which is at least partially connected to the bottom structure, and a portion of the second connecting portion is positioned opposite to a portion of the beam.

[0042] In the above technical solution, at the location of the second connection part, the bottom structure, beam and protective plate are stacked in sequence, so the structure at this location has high strength and good anti-ball performance, and no additional buffer is required.

[0043] In some embodiments of this application, a buffer is provided on the side of the connecting portion facing away from the bottom structure.

[0044] In the above technical solution, by setting a buffer, when subjected to impact, the buffer can deform to absorb the impact energy, thereby enhancing the buffering capacity of the connection and improving the anti-ball performance of the connection and the area near the connection.

[0045] In some embodiments of this application, the protective plate includes a first part and a second part, wherein the impact resistance of the first part is less than that of the second part, and the second part corresponds to the position of the battery cell.

[0046] In the above technical solution, the second part has high impact resistance and corresponds to the position of the battery cell. In this way, the bottom structure at the position corresponding to the battery cell has sufficient anti-ball performance, and the battery cell is not easily damaged or thermally runaway when impacted. The first part corresponds to the position of the other parts that do not require high protection strength, so as to reduce the production cost of the protective plate.

[0047] Secondly, embodiments of this application also provide an electrical device, including the battery device described above, wherein the battery device is used to provide electrical energy to the electrical device.

[0048] In the above technical solution, the production cost of the battery device is reduced, which helps to reduce the production cost of the power-consuming device. Attached Figure Description

[0049] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0050] Figure 2 Exploded views of battery devices provided in some embodiments of this application;

[0051] Figure 3 Bottom view of the housing provided in some embodiments of this application;

[0052] Figure 4 Top view of the basin provided for some embodiments of this application;

[0053] Figure 5 for Figure 4 Sectional view of AA in the middle;

[0054] Figure 6 for Figure 5 A magnified view of part B in the middle section;

[0055] Figure 7 The following is a bottom view of a housing provided in some embodiments of this application, wherein the first buffer element is not shown;

[0056] Figure 8 The following is a bottom view of a housing provided in some embodiments of this application, wherein the second part is not shown;

[0057] Figure 9 This is a three-dimensional structural diagram of the box provided in some embodiments of this application;

[0058] Figure 10 Top view of the housing provided in some embodiments of this application;

[0059] Figure 11 Side view of the housing provided for some embodiments of this application.

[0060] Figure label:

[0061] 1000 vehicles;

[0062] Battery device 100; controller 200; motor 300;

[0063] Box 10;

[0064] 101; 102; 1021; 1022; 1023;

[0065] Beam 1031; Receiving groove 103; Protective plate 104; First part 1041;

[0066] Second part 1042; Third part 1043; First connecting part 1044; Second connecting part 1045;

[0067] 1046; 1047; 105; 106; 107;

[0068] First buffer 1081; Second buffer 1082; Third buffer 1083;

[0069] Battery cell 20; First direction F1; Second direction F2; Height direction F3. Detailed Implementation

[0070] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0071] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0072] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0073] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" 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; and they can refer to the internal communication 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.

[0074] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0075] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0076] In this application, "multiple" means two or more (including two).

[0077] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0078] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0079] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0080] In this application, the battery cell may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, magnesium-ion batteries, or solid-state batteries, etc., and the embodiments of this application are not limited thereto. The battery cell may be cylindrical, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto.

[0081] A single battery cell includes a casing, electrode components, and an electrolyte (which may be a solid electrolyte layer located between the positive and negative electrodes in a solid-state battery). The electrode components include at least one electrode assembly, and both the electrode assembly and the electrolyte are housed within the casing. The electrode assembly includes a positive electrode, a negative electrode, and a separator (this structure can be omitted in solid-state batteries). The battery cell primarily functions by the movement of metal ions between the positive and negative electrodes.

[0082] The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the positive current collector without the positive active material layer protrudes from the positive current collector with the positive active material layer. The positive current collector without the positive active material layer serves as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.

[0083] The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the negative current collector without the negative active material layer protrudes from the negative current collector with the negative active material layer. The negative current collector without the negative active material layer serves as a negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. The material of the separator can be PP, polypropylene, PE, polyethylene, etc. The electrode assembly mentioned in the embodiments of this application has a wound or stacked structure.

[0084] The electrode assembly can be a wound structure or a stacked structure. During processing, the positive electrode sheet, negative electrode sheet, and separator are wound or stacked in sequence to obtain the electrode assembly. In the electrode assembly, multiple positive electrode tabs are stacked together and form an electrical connection with the positive electrode post assembly, and multiple negative electrode tabs are stacked together and form an electrical connection with the negative electrode post assembly.

[0085] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely 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 the application areas of power batteries, the market demand is also constantly increasing.

[0086] A battery pack typically includes a housing and battery cells and other electrical components housed within it. The housing is the structural protective shell of the battery pack, designed to protect the battery cells from mechanical impacts such as vehicle collisions and road bumps, and to prevent internal structural deformation or short circuits. The design of the housing directly affects the battery's safety, lifespan, and performance.

[0087] In related technologies, the battery pack housing structure requires the installation of an independent bottom protective plate. The bottom protective plate is connected to the lower housing of the battery pack via rivet nuts to improve bottom performance. The bottom protective plate needs to be separately electrophoretically coated and sprayed with PVC before being locked onto the bottom surface of the lower housing. Since the lower housing needs to have mounting holes for the rivet nuts to pass through, sealant also needs to be applied around the bottom surface of the lower housing during installation to ensure its sealing performance. This results in high housing manufacturing costs and complex manufacturing processes.

[0088] Based on the above considerations, a battery device is proposed. The battery device includes a battery cell and a housing. The housing includes a cover and a basin. The cover covers the basin and forms a cavity for accommodating the battery cell. The basin is integrally formed with a bottom structure and a side structure. The side structure is arranged around the bottom structure and forms a receiving groove for accommodating the battery cell with the bottom structure. The battery cell is supported by the bottom structure. The housing also includes a protective plate. The protective plate is located on the side of the bottom structure opposite to the receiving groove. The protective plate includes a connecting part and a protective part. The connecting part is fused to the bottom structure. A cavity is formed between the protective part and the bottom structure. The cavity is used to absorb at least part of the external impact.

[0089] In the above technical solution, the protective plate and the basin are welded together, which can reduce the processes of separate electrophoresis and PVC spraying of the protective plate, the opening process of the box and the sealing glue application process, simplifying the production process of the box, reducing the use of manual labor, improving automation efficiency and reducing production costs; the connection between the connecting part and the bottom structure is fused together, which can increase the usable space of the accommodating slot, thereby helping to reduce the size of the battery device or increase the energy density of the battery cell; when the protective part is subjected to external impact, the protective part can deform to one side of the cavity. Due to the existence of the cavity, the impact force on the protective part will not immediately act directly on the bottom structure, thereby helping to reduce the risk of the battery cell being subjected to external impact.

[0090] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0091] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0092] Electrical devices can be energy storage devices, which can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, energy storage devices can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours.

[0093] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0094] Please refer to Figure 1 , Figure 1 The diagram below illustrates the structure of a vehicle 1000 according to some embodiments of this application. The vehicle 1000 is equipped with a battery device 100, which may be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000.

[0095] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0096] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0097] Please refer to Figure 2 , Figure 2 The image shows an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a battery cell 20 and a housing 10 for housing the battery cell 20. The housing 10 can have various structural forms.

[0098] The housing 10 may include a cover 101 and a basin 102, which cover each other and together define a receiving cavity for accommodating the battery cell 20. A sealing element may also be provided at the connection point between the cover 101 and the basin 102 to achieve a sealed connection. For example, refer to... Figure 2Both the lid 101 and the basin 102 can be hollow structures with an opening on one side. The opening side of the lid 101 fits over the opening side of the basin 102, forming a box 10 with a receiving cavity. Alternatively, the basin 102 can be a hollow structure with an opening on one side, and the lid 101 can fit over the opening side of the basin 102. The box 10 can have various shapes, such as a cylindrical box 10, a cuboid box 10, etc.

[0099] Please refer to Figures 3 to 6 , Figure 3 Bottom view of the housing 10 provided for some embodiments of this application; Figure 4 A top view of the basin 102 provided in some embodiments of this application; Figure 5 for Figure 4 Sectional view of AA in the middle; Figure 6 for Figure 5 A magnified view of part B in the middle section.

[0100] Combination Figures 3 to 6 As shown, the basin 102 is integrally formed with a bottom structure 1021 and a side structure 1022. The side structure 1022 is arranged around the bottom structure 1021 and forms a receiving groove 103 with the bottom structure 1021 to accommodate the battery cell 20. The battery cell 20 is supported by the bottom structure 1021. The housing 10 also includes a protective plate 104. The protective plate 104 is located on the side of the bottom structure 1021 away from the receiving groove 103. The protective plate 104 includes a connecting part 1046 and a protective part 1047. The connecting part 1046 is fused to the bottom structure 1021. A cavity 105 is formed between the protective part 1047 and the bottom structure 1021. The cavity 105 is used to absorb at least part of the external impact.

[0101] The connecting portion 1046 is fused to the bottom structure 1021, or in other words, the connecting portion 1046 is welded to the bottom structure 1021. For example, the edge of the bottom structure 1021 can be welded to the protective portion 1047. For example, the middle portion of the bottom structure 1021 can be welded to the protective portion 1047. The welded connection between the bottom structure 1021 and the protective portion 1047 forms a fusion point or fusion seam.

[0102] In the above technical solution, the cost of the weld point or weld seam formed by welding the bottom structure 1021 and the protective part 1047 is much lower than the cost of the locking bolt. Therefore, welding the bottom structure 1021 and the protective part 1047 can reduce the production cost of the housing 10. On the other hand, in the height direction F3 of the battery device 100, the size of the weld point or weld seam is much smaller than the size of the locking bolt. Therefore, welding the bottom structure 1021 and the protective part 1047 together can also increase the usable space of the accommodating groove 103 in the height direction F3, thereby helping to reduce the spatial volume of the battery device 100 and increase the energy density of the battery device 100. Furthermore, since the bottom structure 1021 and the protective part 1047 are welded together, there is no need to open a connection hole on the bottom structure 1021. Therefore, the process of sealing the connection hole of the housing can also be omitted, which further helps to reduce the production cost of the housing 10.

[0103] In the above technical solution, when assembling the protective plate 104 and the box 10, the connecting part 1046 is fused to the bottom structure 1021. For example, the circumferential edge of the protective plate 104 is formed as the connecting part 1046, and the connecting part 1046 is fused to the bottom structure 1021 to form a continuous annular weld. After welding, an integral surface treatment such as electrophoresis is performed. Since the annular weld is continuous, it can seal the cavity 105, so that the cavity 105 is not connected to the outside. The wall surface of the cavity 105 does not need to be surface treated, that is, it does not need to contact the surface treatment liquid. Alternatively, the protective plate 104 is formed with an opening 106 that communicates with the cavity 105. The surface treatment liquid can enter the cavity 105 from the opening 106 to perform surface treatment on the wall surface of the cavity 105.

[0104] In this embodiment, the rivet nut fastening is eliminated, reducing the processes of separate electrophoresis and PVC spraying of the protective plate 104, the opening process of the housing, and the sealing adhesive application process. This simplifies the production process of the housing 10, reduces manual labor, improves automation efficiency, and lowers production costs. Meanwhile, the rivet nut occupies a significant amount of space in its installation direction, which would take up some space in the receiving groove 103, thus affecting the arrangement of the battery cells 20. In this embodiment, the connecting part 1046 is fused to the bottom structure 1021, occupying almost no space in the receiving groove 103. Therefore, the usable space of the receiving groove 103 can be increased, which is beneficial for reducing the size of the battery device 100 or increasing the energy density of the battery cells 20.

[0105] A cavity 105 is formed between the protective part 1047 and the bottom structure 1021. The cavity 105 is used to absorb at least part of the external impact. That is, when the protective part 1047 is subjected to an external impact, the protective part 1047 can deform towards the cavity 105. Due to the presence of the cavity 105, the impact force on the protective part 1047 will not immediately act directly on the bottom structure 1021, thereby helping to reduce the risk of the battery cell 20 being subjected to external impact.

[0106] According to some embodiments of this application, reference can be made to Figure 3 The protective plate 104 includes at least one protective part 1047, the protective part 1047 having at least one opening 106, the opening 106 communicating with the cavity 105.

[0107] For example, the circumferential edge of the protective plate 104 forms a connecting portion 1046, and the remaining portion of the protective plate 104 forms a protective portion 1047.

[0108] For example, multiple connecting parts 1046 are distributed in a dispersed manner, and the portion of the protective plate 104 located between adjacent connecting parts 1046 is spaced apart from the bottom structure 1021 to form an interconnected cavity 105.

[0109] For example, a plurality of protective parts 1047 are provided, and the plurality of protective parts 1047 are connected by a connecting part 1046. The plurality of protective parts 1047 form a plurality of cavities 105. The number of cavities 105 may be the same as the number of protective parts 1047, or it may be different from the number of protective parts 1047.

[0110] In the above technical solution, by providing an opening 106 on the protective part 1047, and the opening 106 communicating with the cavity 105, when the box 10 is surface treated, the surface treatment liquid can enter the cavity 105 through the opening 106, so as to facilitate surface treatment of the wall surface of the box 10 used to define the cavity 105, and thus a surface treatment layer can also be formed on the wall surface of the box 10 used to define the cavity 105. For example, the surface treatment layer can be an electrophoretic layer, so that the basin 102 and the protective plate 104 have good anti-corrosion performance, and improve the reliability of the box 10.

[0111] According to some embodiments of this application, reference can be made to Figure 3 A portion of the edge of the protective plate 104 is spaced apart from the bottom structure 1021 to form an opening 106.

[0112] It should be noted that the edge refers to the portion of the protective plate 104 near its edge. For example, a portion of the edge of the protective plate 104 has a first protrusion protruding away from the bottom structure 1021, the first protrusion being spaced apart from the bottom structure 1021 to form an opening 106; or, a portion of the bottom structure 1021 corresponding to a portion of the edge of the protective plate 104 has a second protrusion protruding away from the protective plate 104, the second protrusion being spaced apart from the protective plate 104 to form an opening 106; or, a portion of the edge of the protective plate 104 has a first protrusion protruding away from the bottom structure 1021, and a portion of the bottom structure 1021 corresponding to a portion of the edge of the protective plate 104 has a second protrusion protruding away from the protective plate 104, the first protrusion and the second protrusion being spaced apart to form an opening 106.

[0113] For example, portions of the edges on both sides of the protective plate 104 in the first direction F1 are spaced apart from the bottom structure 1021 to form openings 106. For example, portions of the edges on both sides of the protective plate 104 in the second direction F2 are spaced apart from the bottom structure 1021 to form openings 106. The first direction F1 and the second direction F2 are arranged at a predetermined angle, for example, the angle between the first direction F1 and the second direction F2 is 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, 90°, etc.

[0114] In the above technical solution, when the housing 10 is surface treated, the surface treatment liquid can enter the cavity 105 through the opening 106, so that the wall surface of the housing 10 used to define the cavity 105 can also form a surface treatment layer. At the same time, part of the edge of the protective plate 104 is spaced apart from the bottom structure 1021 to form the opening 106. On the one hand, the surface treatment liquid can enter the cavity 105 through the opening 106 and be drained from the cavity 105 as soon as possible, reducing the possibility of surface treatment liquid remaining in the cavity 105, so as to obtain a good surface treatment effect, such as electrophoresis effect; on the other hand, the setting of the opening 106 has little impact on the structural strength of the protective plate 104.

[0115] According to some embodiments of this application, reference can be made to Figure 3 The dimension of the bottom structure 1021 in the first direction F1 is larger than the dimension of the bottom structure 1021 in the second direction F2, and the protective plate 104 has openings 106 formed on both sides of the second direction F2.

[0116] It should be noted that, typically during electrophoresis, the tank 10 is hoisted up by the beam 1031 installed on one side of the tank 10 in the second direction F2, and then placed into the electrophoresis solution along the second direction F2 for surface treatment.

[0117] In the above technical solution, the openings 106 are formed on both sides of the protective plate 104 along the second direction F2. In this way, once the protective plate 104 is immersed in the electrophoresis solution, the electrophoresis solution can enter the cavity 105 through the lower opening 106. The gas in the cavity 105 can be discharged through the upper opening 106. When the basin 102 and the protective plate 104 are removed from the electrophoresis solution along the second direction F2, the excess electrophoresis solution will be discharged from the opening 106 as much as possible, reducing the possibility of electrophoresis solution remaining in the cavity 105, so as to obtain a good electrophoresis effect.

[0118] According to some embodiments of this application, reference can be made to Figure 3 The protective part 1047 has a through hole 107, which is formed as an opening 106.

[0119] By providing through holes 107, the surface treatment liquid can enter the cavity 105 through the through holes 107 during electrophoresis. Exemplarily, a plurality of through holes 107 are provided spaced apart along one side of the protective plate 104 to the other. The multiple through holes 107 can be the same or different in size.

[0120] In the above technical solution, the surface treatment liquid can enter the cavity 105 through the through hole 107, so that the wall surface of the box 10 used to form the cavity 105 can also form an electrophoretic layer; multiple through holes 107 can be conveniently provided to increase the speed at which the surface treatment liquid flows into the cavity 105.

[0121] According to some embodiments of this application, the surface of the basin 102 is provided with a surface treatment layer, and the outer surface and at least part of the inner surface of the protective plate 104 are provided with a surface treatment layer.

[0122] Here, the surface treatment liquid cannot reach the wall surface where the bottom structure 1021 is connected to the connecting part 1046, so no surface treatment layer is provided at the position corresponding to the bottom structure 1021 and the connecting part 1046 and at the position of the connecting part 1046 facing the bottom structure 1021.

[0123] In the above technical solution, by providing a surface treatment layer on the surface of the basin 102 and the protective plate 104, it is beneficial to make the basin 102 and the protective plate 104 have better performance, such as better anti-corrosion and anti-scratch performance.

[0124] According to some embodiments of this application, the surface treatment layer is an electrophoretic layer.

[0125] In other words, the basin 102 and the protective plate 104 can be immersed together in the electrophoresis solution to form an electrophoretic layer on the surfaces of the basin 102 and the protective plate 104 that can be reached by the electrophoresis solution.

[0126] In the above technical solution, an electrophoretic layer is formed on the surface of the basin 102 and the protective plate 104 to prevent the box 10 from rusting in humid, salt spray and other environments; the electrophoretic layer has good insulation properties, which can reduce the risk of short circuit in the battery device 100.

[0127] Based on some embodiments of this application, comparisons can be made. Figure 3 and Figure 8 , Figure 8 This is a bottom view of a housing 10 provided in some embodiments of this application, wherein the second part 1042 is not shown, and at least a portion of the cavity 105 is provided with a second buffer 1082.

[0128] For example, there may be only one second buffer 1082, or there may be multiple second buffers 1082 of smaller size. The multiple second buffers 1082 are arranged at intervals. The production cost of multiple smaller second buffers 1082 is lower, which is beneficial to reducing the production cost of battery device 100.

[0129] For example, the second buffer 1082 can be a rubber sheet, foam board, honeycomb aluminum sheet, foam material component, etc.

[0130] In the above technical solution, the combination of the buffering performance of the second buffer 1082 and the rigidity of the protective plate 104 gives the housing 10 better energy absorption capacity, which is beneficial to improving the bottom ball performance of the housing 10. When the area between the adjacent second buffer 1082 of the protective plate 104 is impacted by a bottom ball, it can absorb the impact energy of the bottom ball through its own deformation, thus meeting the bottom ball performance requirements.

[0131] According to some embodiments of this application, the cushioning element is a foamed material.

[0132] For example, the foamed material can be a polyurethane foam, an ethylene-vinyl acetate copolymer foam, a polypropylene foam, a polystyrene foam, etc. The cushioning element here can be one or more of the first cushioning element 1081, the second cushioning element 1082, and the third cushioning element 1083.

[0133] In the above technical solution, the foamed material component has good energy absorption capacity. When subjected to impact, the foamed material component absorbs energy through elastic deformation or collapse, reducing the impact force transmitted to the battery cell 20. In addition, the density of the foamed material is usually much lower than that of rubber or metal cushioning components, which also helps to reduce the weight of the housing 10.

[0134] According to some embodiments of this application, the foaming temperature range of the foamed material is 170°C to 190°C.

[0135] It should be noted that after the chamber 10 is placed in the electrophoresis solution to complete electrophoresis, an electrophoretic paint film will be formed on the surface of the chamber 10. Then, the electrophoretic paint film will be baked. After baking, the electrophoretic paint film on the surface of the chamber 10 will be cured into a hard and corrosion-resistant electrophoretic layer. The baking temperature is generally 160℃~180℃.

[0136] In the above technical solution, the foaming temperature range of the foamed material is 170℃~190℃. That is to say, the foaming temperature of the foamed material is close to the baking temperature of the electrophoretic paint film. Therefore, during production, unfoamed high-temperature foamable material can be arranged on the basin 102 or the protective plate 104 first. After electrophoresis is completed, during the baking process of the electrophoretic paint film, the unfoamed high-temperature foamable material simultaneously completes foaming to form a foamed material. The foamed material forms a buffer. Thus, the process of separately foaming the unfoamed high-temperature foamable material can be reduced, thereby reducing production costs.

[0137] According to some embodiments of this application, the foamed material is a polyurethane foamed material.

[0138] In the above technical solution, the polyurethane foam material has good elasticity and oil resistance, can absorb impact energy well, and has a long service life, which can better adapt to the usage scenarios of the battery device 100.

[0139] According to some embodiments of this application, reference can be made to Figure 6 At least one of the bottom structure 1021 and the protective part 1047 is connected to the second buffer 1082.

[0140] For example, before the bottom structure 1021 and the protective part 1047 are connected, the second buffer 1082 can be fixed to the bottom structure 1021. After the bottom structure 1021 and the protective part 1047 are connected, the second buffer 1082 can contact the protective part 1047, form a connection with the protective part 1047, or be spaced a certain distance from the protective part 1047.

[0141] Alternatively, for example, before the bottom structure 1021 and the protective part 1047 are connected, the second buffer 1082 can be fixed to the protective part 1047. After the bottom structure 1021 and the protective part 1047 are connected, the second buffer 1082 can contact the bottom structure 1021, form a connection with the bottom structure 1021, or be spaced a certain distance from the bottom structure 1021.

[0142] In the above technical solution, at least one of the bottom structure 1021 and the protective part 1047 is connected to the second buffer 1082. In this way, the second buffer 1082 is not easy to shift and can be kept in the designed position to obtain a better protective effect.

[0143] According to some embodiments of this application, at least one of the bottom structure 1021 and the protective part 1047 includes a first region and a second region, the first region being connected to the second buffer 1082, and the second region having a surface treatment layer formed thereon.

[0144] In other words, the second buffer 1082 is first connected to one of the bottom structure 1021 and the protective part 1047, and then the bottom structure 1021 and the protective part 1047 are connected as a whole for surface treatment.

[0145] In the above embodiments, since the first region is connected to and covered by the second buffer 1082, the first region may not require surface treatment liquid, or the surface treatment liquid may not reach the first region.

[0146] Figure 8 The image shows a bottom view of a housing provided for some embodiments of this application, wherein the second part is not shown. Reference can be made to some embodiments of this application. Figure 8 The dimension of the bottom structure 1021 in the first direction F1 is greater than the dimension of the bottom structure 1021 in the second direction F2. In the first direction F1, the dimension of the buffer is D1, and the spacing between adjacent buffers is D2, where D1:D2 = 1:1 to 1:4.

[0147] It should be noted that the buffers here include a first buffer 1081 and a second buffer 1082. For example, D1:D2 can be 1:1, 1:1.5, 1:2, 1:2.5, 1:3, 1:3.5, 1:4, or any value between any two of these. For example, in the first direction F1, the size of the first buffer 1081 can be 23mm, and the spacing between adjacent buffers can be 60mm.

[0148] In the above technical solution, the number of buffer components will not be too large, so as to make the cost too high, and the number of buffer components will not be too small, so as to make the anti-ball performance of the box 10 not meet the requirements.

[0149] In some embodiments, to reduce the number of parts, the material, shape, and size of the first buffer 1081 may be the same as those of the second buffer 1082. In other embodiments, the first buffer 1081 may be different from the second buffer 1082.

[0150] According to some embodiments of this application, reference can be made to Figure 6 The maximum distance between the protective part 1047 and the bottom structure 1021 is L, where L = 2mm to 3mm.

[0151] For example, the maximum distance between the protective part 1047 and the bottom structure 1021 can be 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, or any value between any two of these values.

[0152] In the above technical solution, the maximum distance between the protective part 1047 and the bottom structure 1021 is 2mm to 3mm. In this way, the maximum distance between the protective part 1047 and the bottom structure 1021 will not be too large and increase the Z-axis dimension of the box 10 too much. At the same time, the maximum distance between the protective part 1047 and the bottom structure 1021 will not be too small, resulting in poor cushioning effect.

[0153] According to some embodiments of this application, reference can be made to Figure 7 , Figure 7 This is a bottom view of a housing provided in some embodiments of this application, wherein the first buffer member is not shown. Multiple connecting portions 1046 are provided, and the multiple connecting portions 1046 are spaced apart.

[0154] For example, multiple protective portions 1047 can be formed between multiple connecting portions 1046, so that protective portions 1047 are formed at all locations of the protective plate 104 as much as possible, so as to reduce the possibility that the bottom structure 1021 is directly subjected to external impact.

[0155] In the above technical solution, the connection stability between the protective plate 104 and the bottom structure 1021 is good, and the connection process between the protective plate 104 and the bottom structure 1021 takes less time.

[0156] According to some embodiments of this application, a protective portion 1047 is provided between two adjacent connecting portions 1046, and a protective plate 104 is recessed to form a connecting portion 1046. Specifically, the protective plate 104 is recessed towards the bottom structure 1021 to form the connecting portion 1046.

[0157] According to some embodiments of this application, a protective portion 1047 is provided between two adjacent connecting portions 1046, and a bottom structure 1021 is recessed to connect with the connecting portion 1046. Specifically, the bottom structure 1021 is recessed towards the protective plate 104 to connect with the connecting portion 1046.

[0158] In the above embodiments, the connecting portion 1046 is partially recessed or the bottom structure 1021 is partially recessed, so that other positions of the protective plate 104 and the bottom structure 1021 can define cavities to achieve the purpose of buffering. At the same time, the formation of the recessed portion can also enhance the structural strength of the protective plate 104 and the bottom structure 1021.

[0159] For example, the mating area between the bottom structure 1021 and the protective plate 104 can be glued before the bottom structure 1021 and the protective plate 104 are connected, so that the mating area also has good corrosion resistance.

[0160] According to some embodiments of this application, reference can be made to Figure 7 The connecting portion 1046 includes a first connecting portion 1044 and a second connecting portion 1045, wherein the first connecting portion 1044 is closer to the middle of the protective plate 104 than the second connecting portion 1045.

[0161] In other words, a portion of the central area of ​​the protective plate 104 is welded to the bottom structure 1021, while a portion of the edge of the protective plate 104 is also welded to the bottom structure 1021.

[0162] In the above technical solution, by setting a first connecting part 1044 closer to the center of the protective plate 104, that is, the center of the protective plate 104 is also connected to the bottom structure 1021, the center of the protective plate 104 can deform in tandem with the bottom structure 1021, thereby improving the deformation resistance of the center of the protective plate 104. This makes the center of the protective plate 104 less prone to deformation and vibration during use. At the same time, it also makes the dimensional stability of the cavity near the center of the protective plate 104 better, which is conducive to obtaining good electrophoresis quality. In addition, the fusion point formed by welding the first connecting part 1044 and the bottom structure 1021 is much smaller in size in the height direction F3 of the battery device 100 than the locking bolt, so it has little impact on the arrangement space of the battery cells 20.

[0163] According to some embodiments of this application, reference can be made to Figure 7 and Figure 8 The box body 10 also includes a beam 1031, which is at least partially connected to the bottom structure 1021, and a portion of the second connecting part 1045 is positioned opposite to a portion of the beam 1031.

[0164] It should be noted that, in order to install the battery device 100 onto the external support, a beam 1031 is generally provided on the basin 102, and the box 10 is mounted on the beam 1031. The beam 1031 can extend partially to the bottom structure 1021, and part of the second connecting part 1045 is attached to the part of the beam 1031 that extends to the bottom structure 1021.

[0165] In the above technical solution, part of the second connecting part 1045 is positioned opposite to part of the beam 1031, and the beam 1031 is connected to the bottom structure 1021. That is to say, at the position corresponding to part of the second connecting part 1045, the bottom structure 1021, the beam 1031 and the protective plate 104 are stacked in sequence. As a result, the structure at this position has high strength and good anti-ball performance, and no additional buffer is required.

[0166] Based on some embodiments of this application, comparisons can be made. Figure 3 and Figure 7 The connecting part 1046 has a first buffer 1081 on the side facing away from the bottom structure 1021.

[0167] For example, the first buffer 1081 can be a rubber sheet, foam board, honeycomb aluminum sheet, foam material, etc.

[0168] In the above technical solution, the connecting part 1046 and the bottom structure 1021 are fitted together. The connecting part 1046 does not have a buffer space. By setting the first buffer 1081, when it is impacted, the first buffer 1081 can deform to absorb the impact energy, thereby enhancing the buffering capacity of the connecting part 1046 and improving the anti-ball performance of the connecting part 1046 and the area near the connecting part 1046.

[0169] Based on some embodiments of this application, comparisons can be made. Figure 7 and Figure 8 The protective plate 104 includes a first part 1041 and a second part 1042. The impact resistance of the first part 1041 is less than that of the second part 1042. The second part 1042 corresponds to the position of the battery cell 20.

[0170] For example, the thickness of the first portion 1041 may be less than the thickness of the second portion 1042, so that the impact strength of the first portion 1041 is less than the impact strength of the second portion 1042. Alternatively, the first portion 1041 may be made of ordinary low-carbon steel, and the second portion 1042 may be made of high-strength steel, thereby making the impact strength of the first portion 1041 less than the impact strength of the second portion 1042.

[0171] In the above technical solution, the second part 1042 has high impact resistance and corresponds to the position of the battery cell 20. Thus, the bottom structure 1021 at the position corresponding to the battery cell 20 has sufficient anti-ball performance, and the battery cell 20 is not easily damaged or thermally runaway when impacted. The first part 1041 corresponds to the position of the other parts that do not require high protection strength, so as to reduce the production cost of the protective plate 104.

[0172] For example, the first part 1041 and the second part 1042 can be separately molded parts, which are then sequentially connected to the bottom structure 1021. For example, refer to Figure 3The first portion 1041 has a rib extending along the second direction F2. The rib and the bottom structure 1021 together define a cavity 105. The rib also has a through hole 107 that communicates with the cavity 105. Exemplarily, the second portion 1042 is spaced apart from the bottom structure 1021 to form the cavity 105. The second portion 1042 has a through hole 107 that communicates with the cavity 105.

[0173] In the above technical solution, cavities 105 are formed between the first part 1041 and the bottom structure 1021, and between the second part 1042 and the bottom structure 1021. Openings 106 are formed in both the first part 1041 and the second part 1042, so that the first part 1041 and the second part 1042 can be electrophoretically coated together with the bottom structure 1021, thereby reducing the processing steps of the box 10 and reducing the production cost of the box 10.

[0174] In some embodiments, the first portion 1041 and the second portion 1042 are connected by overlapping. That is, the edges of the first portion 1041 and the second portion 1042 at the connection point overlap each other.

[0175] In the above technical solution, the first part 1041 and the second part 1042 are connected by overlapping. On the one hand, the connection area of ​​the first part 1041 and the second part 1042 is large, and the dimensions at the connection position of the first part 1041 and the second part 1042 do not need to be precisely controlled. Therefore, it is beneficial to reduce the processing and connection difficulty of the first part 1041 and the second part 1042. On the other hand, the first part 1041 and the second part 1042 are connected by overlapping. At the overlapping position, the bottom structure 1021, the first part 1041 and the second part 1042 are stacked. Therefore, the structure at this position has high strength and good impact resistance.

[0176] In some embodiments, reference may be made to Figure 3 and Figure 7 The battery device 100 also includes a third buffer 1083, which is located on the side of the protective plate 104 facing away from the bottom structure 1021 and corresponds to the connection point of the first part 1041 and the second part 1042.

[0177] For example, the shape, size, and structure of the third buffer 1083 may be the same as, or different from, the shape, size, and structure of the first buffer 1081. For example, the third buffer 1083 may be a rubber sheet, foam board, honeycomb aluminum sheet, foam material, etc.

[0178] In the above technical solution, a third buffer 1083 is provided at the connection between the first part 1041 and the second part 1042. This can enhance the buffer deformation capacity at the connection between the first part 1041 and the second part 1042, thereby improving the impact resistance.

[0179] In some embodiments, reference may be made to Figure 7 and Figure 8 The protective plate 104 also includes a third part 1043, the impact resistance of the third part 1043 is less than that of the second part 1042, and the third part 1043 is attached to the bottom structure 1021.

[0180] For example, the thickness of the third portion 1043 may be less than the thickness of the second portion 1042, so that the impact strength of the third portion 1043 is less than the impact strength of the second portion 1042. Alternatively, the third portion 1043 may be made of ordinary low-carbon steel, and the second portion 1042 may be made of high-strength steel, thereby making the impact strength of the third portion 1043 less than the impact strength of the second portion 1042.

[0181] In the above technical solution, the third part 1043 can protect the bottom structure 1021. The area of ​​the bottom structure 1021 corresponding to the third part 1043 does not need high anti-balling performance. Therefore, the third part 1043 can be attached to the bottom structure 1021 to reduce processing steps and reduce the processing cost of the box 10.

[0182] According to a second aspect of the present application, the present application also provides an electrical device, which includes a battery device 100 of any of the above-described schemes, and the battery device 100 is used to provide electrical energy to the electrical device.

[0183] The electrical device according to the second aspect embodiment of this application includes the battery device 100 according to the first aspect embodiment of this application described above, the battery device 100 being used to provide electrical energy to the electrical device. Therefore, by employing the battery device 100 described above, the production cost of the electrical device can be reduced.

[0184] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0185] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery device, characterized in that, include: Battery cell; The housing includes a cover and a basin. The cover covers the basin and forms a cavity for accommodating the battery cell. The basin is integrally formed with a bottom structure and a side structure. The side structure surrounds the bottom structure and forms a receiving groove with the bottom structure to accommodate the battery cell. The battery cell is supported by the bottom structure. The enclosure also includes a protective plate located on the side of the bottom structure opposite to the receiving groove. The protective plate includes a connecting part and a protective part. The connecting part is fused to the bottom structure, and a cavity is formed between the protective part and the bottom structure. The cavity is used to absorb at least part of the external impact.

2. The battery device as claimed in claim 1, characterized in that, The protective plate includes at least one protective part, which has at least one opening that communicates with the cavity.

3. The battery device as claimed in claim 2, characterized in that, A portion of the edge of the protective plate is spaced apart from the bottom structure to form the opening.

4. The battery device as claimed in claim 3, characterized in that, The dimension of the bottom structure in the first direction is larger than the dimension of the bottom structure in the second direction, and the openings are formed on both sides of the protective plate in the second direction.

5. The battery device as claimed in claim 2, characterized in that, The protective part has a through hole, which forms the opening.

6. The battery device according to any one of claims 1-5, characterized in that, The surface of the basin is provided with a surface treatment layer, and the outer surface and at least part of the inner surface of the protective plate are provided with a surface treatment layer.

7. The battery device as claimed in claim 6, characterized in that, The surface treatment layer is an electrophoretic layer.

8. The battery device according to any one of claims 1-3 and 5, characterized in that, At least part of the cavity is provided with a buffer.

9. The battery device as claimed in claim 8, characterized in that, The buffer component is made of foam material.

10. The battery device as claimed in claim 9, characterized in that, The foaming temperature range of the foamed material is 170℃~190℃.

11. The battery device as claimed in claim 9, characterized in that, The foamed material component is a polyurethane foamed material component.

12. The battery device as claimed in claim 8, characterized in that, At least one of the bottom structure and the protective part is connected to the buffer.

13. The battery device as claimed in claim 12, characterized in that, At least one of the bottom structure and the protective part includes a first region and a second region, the first region being connected to the buffer member, and the second region having a surface treatment layer formed thereon.

14. The battery device as claimed in claim 8, characterized in that, The dimension of the bottom structure in the first direction is greater than the dimension of the bottom structure in the second direction. In the first direction, the dimension of the buffer is D1, and the spacing between adjacent buffers is D2, where D1:D2 = 1:1 to 1:

4.

15. The battery device according to any one of claims 1-5, characterized in that, The maximum distance between the protective part and the bottom structure is L, where L = 2 mm to 3 mm.

16. The battery device according to any one of claims 1-5, characterized in that, The connecting parts are provided in multiple ways, and the multiple connecting parts are arranged at intervals.

17. The battery device as claimed in claim 16, characterized in that, The protective portion is provided between two adjacent connecting portions, wherein the protective plate is recessed to form the connecting portion or the bottom structure is recessed to connect with the connecting portion.

18. The battery device as claimed in claim 16, characterized in that, The connecting portion includes a first connecting portion and a second connecting portion, wherein the first connecting portion is closer to the center of the protective plate than the second connecting portion.

19. The battery device as claimed in claim 18, characterized in that, The box body also includes a beam, which is at least partially connected to the bottom structure, and a portion of the second connecting portion is positioned opposite to a portion of the beam.

20. The battery device as claimed in claim 16, characterized in that, The connecting part has a buffer on the side facing away from the bottom structure.

21. The battery device according to any one of claims 1-5, characterized in that, The protective plate includes a first part and a second part. The impact resistance of the first part is less than that of the second part. The second part corresponds to the position of the battery cell.

22. An electrical appliance, wherein, The device includes a battery device as described in any one of claims 1-21, the battery device being used to provide electrical energy to the electrical device.

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