Battery device and electric device

Abstract

The utility model discloses a battery device and a power utilization device, and relates to the field of batteries, the battery device comprises a battery assembly and a side plate structure, the battery assembly comprises at least one battery monomer, at least one side of the battery assembly is provided with the side plate structure, the side plate structure comprises a side plate main body and an insulating film, the side plate main body comprises a side plate and a heat insulation layer, the heat insulation layer is fixed to the side plate, the side plate and the heat insulation layer are stacked in the thickness direction of the side plate, the insulation film wraps at least part of the side plate and at least part of the heat insulation layer, and the insulation film is fixed to the side plate and the heat insulation layer. Therefore, by arranging the insulating film, the thermal insulation layer can be reliably fixed on the side plate, the risk that the thermal insulation layer falls off from the side plate structure is reduced, the reliability of the battery device is improved, and the risk of abnormal sound of the battery device is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery, in particular to a battery device and an electric device with the battery device. BACKGROUND

[0002] In the related art, during the use of the battery device, there is a risk of thermal runaway caused by abnormal battery monomer. In order to ensure the heat diffusion protection requirement and block the thermal runaway of the battery device from being transmitted outward, a heat insulation layer is arranged on the side plate structure of the battery device. However, the heat insulation layer is easy to fall off from the side plate structure. After the heat insulation layer falls off from the side plate structure, the battery device loses the heat diffusion protection capability, which affects the reliability of the battery device. CONTENT OF THE UTILITY MODEL

[0003] The present application aims to at least solve one of the technical problems in the prior art. To this end, one purpose of the present application is to provide a battery device which can reduce the risk of heat insulation layer falling off from the side plate structure, and is conducive to improving the reliability of the battery device and reducing the risk of abnormal sound of the battery device.

[0004] The present application further provides an electric device.

[0005] In a first aspect, the embodiments of the present application provide a battery device, comprising:

[0006] The battery assembly comprises at least one battery monomer, and at least one side of the battery assembly is provided with the side plate structure. The side plate structure comprises a side plate main body and an insulating film. The side plate main body comprises a side plate and a heat insulation layer, and the heat insulation layer is fixed to the side plate. The side plate and the heat insulation layer are stacked along the thickness direction of the side plate. The insulating film is wrapped on at least part of the side plate and at least part of the heat insulation layer, and the insulating film is fixed to the side plate and the heat insulation layer.

[0007] In the above technical solution, by arranging the insulating film, the heat insulation layer can be reliably fixed to the side plate, the risk of heat insulation layer falling off from the side plate structure is reduced, the reliability of the battery device is improved, and the risk of abnormal sound of the battery device is also reduced.

[0008] In some embodiments, the insulating film is arranged around the side plate main body in a first direction, and the first direction is perpendicular to the thickness direction of the side plate structure.

[0009] In the above technical solution, by extending the insulating film in the first direction, the insulating film can be arranged around the side plate main body, which facilitates the wrapping of the insulating film on the side plate and the heat insulation layer, facilitates the production and manufacturing of the side plate structure, improves the production efficiency of the side plate structure, and thus makes the insulating film structure design reasonable.

[0010] In some embodiments, along the direction of the insulating film surrounding the side plate body, a first overlapping section and a second overlapping section are respectively formed at both ends of the insulating film, and the first overlapping section and the second overlapping section are stacked and fixedly connected.

[0011] In the above technical solution, a first overlapping section and a second overlapping section are formed at both ends of the insulating film, and the first overlapping section and the second overlapping section are fixedly connected. This can make the insulating film into a ring structure, or make the insulating film tightly wrapped around the side plate and the heat insulation layer, so that the insulating film can be reliably wrapped around the outside of the side plate body.

[0012] In some embodiments, the first overlapping section and the second overlapping section are located on the side of the side panel away from the insulation layer; or

[0013] The first and second overlapping sections are located on the side of the insulation layer away from the side panel.

[0014] In the above technical solution, by setting the first overlapping section and the second overlapping section on the side of the side plate away from the heat insulation layer, or by setting the first overlapping section and the second overlapping section on the side of the heat insulation layer away from the side plate, the connection position of the first overlapping section and the second overlapping section is located on the side of the side plate with a larger surface area. This facilitates the overlapping connection of the first overlapping section and the second overlapping section, which helps to reduce the production difficulty of the side plate structure, thereby improving the production efficiency of the side plate structure, and further improving the production efficiency of the battery device.

[0015] In some embodiments, a sealing portion is formed at at least one end of the insulating film along a first direction, at least a portion of the sealing portion extends out of the side plate body along the first direction, and the sealing portion includes a first sealing segment and a second sealing segment, the first sealing segment and the second sealing segment being opposite to and fixedly connected along the thickness direction of the side plate structure.

[0016] In the above technical solution, by connecting the first sealing section and the second sealing section relative to each other and fixedly connected along the thickness direction of the side plate structure, the insulating film can cover the end position of the side plate body along the first direction. The insulating film can block the edge position of the heat insulation layer, further reducing the intrusion of external moisture, dust and other pollutants from the edge position of the heat insulation layer between the side plate and the heat insulation layer, further reducing the impact of external moisture, dust and other pollutants on the adhesive layer bonding performance, further reducing the risk of adhesive layer detachment, and more conducive to improving the environmental adaptability of the battery device.

[0017] In some embodiments, the thermal insulation layer is located on the side of the side panel opposite to the battery assembly.

[0018] In the above technical solution, by setting the heat insulation layer on the side of the side plate away from the battery module, it is beneficial to maintain the surface flatness of the side plate structure facing the battery module, so that the battery cells can be reliably bonded to the side plate structure, and the heat diffusion between battery modules can be reduced, thus making the heat insulation layer set in a reasonable position.

[0019] In some embodiments, the battery cell has a pressure relief structure, and the battery device further includes a protective structure having a first protective portion located on the side of the side plate structure facing the battery assembly. The side plate structure has a first side edge, and the first side edge and the pressure relief structure are located on the same side of the battery device. The first protective portion is disposed along the extending direction of the first side edge.

[0020] In the above technical solution, by setting up a protective structure, when the material inside the battery cell is ejected from the pressure relief structure, the protective structure can block the material ejected from the battery cell, reduce the risk of short circuit caused by the overlap between the battery cell and the side plate, and help improve the reliability of the battery device.

[0021] In some embodiments, the protective structure further includes a second protective portion and a third protective portion, the third protective portion being located on the side of the side plate structure facing away from the battery assembly, and the second protective portion connecting the first protective portion and the second protective portion, such that it is fitted onto the first side edge of the side plate structure.

[0022] In the above technical solution, the protective structure is fitted onto the first side edge of the side plate structure, which facilitates the assembly of the protective structure onto the side plate structure and can reliably limit the first protective part to the side of the side plate structure facing the battery assembly.

[0023] In some embodiments, the protective structure is fixed to the side plate structure.

[0024] In the above technical solution, by fixing the protective structure to the side plate structure, the risk of the protective structure detaching from the side plate structure is reduced, and the protective structure is reliably assembled to the side plate structure. When the material inside the battery cell is ejected from the pressure relief structure, the protective structure can reliably shield the material ejected from the battery cell, further reducing the risk of short circuit caused by the battery cell overlapping with the side plate, which is more conducive to improving the reliability of the battery device.

[0025] Secondly, embodiments of this application provide an electrical device, including the battery device described above.

[0026] The above technical solutions are beneficial to improving the reliability of electrical devices and also to reducing the risk of abnormal noises from electrical devices.

[0027] 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

[0028] 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:

[0029] Figure 1This is a schematic diagram of a vehicle according to an embodiment of this application;

[0030] Figure 2 This is an exploded view of a battery device (without side panel structure) according to an embodiment of this application;

[0031] Figure 3 This is a schematic diagram of a battery module (without side panel structure) according to an embodiment of this application;

[0032] Figure 4 This is a schematic diagram of the side plate structure according to an embodiment of this application;

[0033] Figure 5 yes Figure 4 Enlarged view of point A in the middle;

[0034] Figure 6 This is a schematic diagram of the side plate structure according to an embodiment of this application from another angle;

[0035] Figure 7 This is a side view of the side panel structure according to an embodiment of this application;

[0036] Figure 8 This is a cross-sectional view of the side plate structure according to an embodiment of this application;

[0037] Figure 9 yes Figure 8 Enlarged view at point B in the middle;

[0038] Figure 10 This is an exploded view of the side panel structure according to an embodiment of this application;

[0039] Figure 11 yes Figure 10 Enlarged view of point C in the middle.

[0040] Figure label:

[0041] Battery device 100;

[0042] Battery assembly 10; battery cell 11; pressure relief structure 111;

[0043] Side panel structure 20;

[0044] Side panel body 21; side panel 211; heat insulation layer 212; adhesive layer 213; assembly structure 214;

[0045] Insulating film 22; First sub-insulating part 221; Second sub-insulating part 222; First sealing section 223; Second sealing section 224; First overlapping section 225; Second overlapping section 226; Overlap area 227; Third sub-insulating part 228;

[0046] First side edge 23;

[0047] Protective structure 30; First protective part 31; Installation space 32; Second protective part 33; Third protective part 34;

[0048] Box 40; First box 41; Second box 42;

[0049] Vehicle 200; Controller 201; Motor 202. Detailed Implementation

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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, D and / or E can represent: D existing alone, D and E existing simultaneously, or E existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0055] 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.

[0056] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0057] In this application, "multiple" means two or more (including two).

[0058] The battery device mentioned in the embodiments of this application may include multiple battery modules. Each battery module may include a side plate structure and multiple battery cells. The multiple battery cells form a battery assembly. At least one side of the battery assembly is provided with a side plate structure. The multiple battery cells are connected in series, in parallel or in a mixed manner through a busbar component.

[0059] In some embodiments, the battery device includes a housing and a plurality of battery modules housed within the housing.

[0060] As an example, multiple battery modules can be housed in a housing by directly fixing them to the housing.

[0061] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a mounting cavity inside the enclosure, which can accommodate multiple battery modules, i.e., multiple battery modules are installed in the mounting cavity. Here, "enclosed" refers to covering or closing, which can be sealed or not sealed. The first enclosure may be one of the upper enclosure and the lower enclosure, and the second enclosure may be the other of the upper enclosure and the lower enclosure.

[0062] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0063] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0064] Battery cells can be cylindrical, flat, cuboid, or other shapes, and this application embodiment is not limited to any of these. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and this application embodiment is not limited to any of these types either.

[0065] A battery cell includes a casing, electrode assembly, and electrolyte. The casing houses the electrode assembly and electrolyte. The electrode assembly consists of an anode electrode, a cathode electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the anode and cathode electrodes. The anode electrode includes an anode current collector and an anode active material layer. The anode active material layer is coated on the surface of the anode current collector. The uncoated anode current collector protrudes beyond the coated anode current collector and serves as the anode tab. Taking a lithium-ion battery as an example, the anode current collector can be made of aluminum, and the anode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The cathode electrode includes a cathode current collector and a cathode active material layer. The cathode active material layer is coated on the surface of the cathode current collector. The uncoated cathode current collector protrudes beyond the coated cathode current collector and serves as the cathode tab. The cathode current collector can be made of copper, and the cathode active material can be carbon or silicon, etc. To ensure that a large current can be passed without melting, there are multiple anode tabs stacked together, and there are multiple cathode tabs stacked together.

[0066] The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0067] In recent years, the vehicle industry has developed rapidly. Taking new energy vehicles as an example, the battery device, as a core component of the vehicle, plays an irreplaceable and important role.

[0068] In related technologies, during the use of battery devices, there is a risk of thermal runaway caused by abnormalities in individual battery cells. Therefore, in order to ensure thermal diffusion protection and prevent the thermal runaway of the battery device from being transmitted outward, a heat insulation layer is installed on the side plate structure of the battery device. However, the heat insulation layer is prone to detaching from the side plate structure. After the heat insulation layer detaches from the side plate structure, the battery device loses its thermal diffusion protection capability, affecting the reliability of the battery device. Furthermore, after the heat insulation layer detaches, its movement within the battery device can cause abnormal noises in the battery device.

[0069] Based on the above considerations, to address the issue of the heat insulation layer detaching from the side plate structure, a battery device was designed after in-depth research. The device includes a battery assembly and a side plate structure. The battery assembly includes at least one battery cell. At least one side of the battery assembly has a side plate structure, which includes a side plate body and an insulating film. The side plate body includes a side plate and a heat insulation layer, which is fixed to the side plate. The side plate and the heat insulation layer are stacked along the thickness direction of the side plate. The insulating film covers at least a portion of the side plate and at least a portion of the heat insulation layer, and is fixed to both the side plate and the heat insulation layer. Therefore, by providing an insulating film, the heat insulation layer can be reliably fixed to the side plate, reducing the risk of the heat insulation layer detaching from the side plate structure. This improves the reliability of the battery device and also reduces the risk of abnormal noise from the battery device.

[0070] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 200 provided in some embodiments of this application. The vehicle 200 can be a gasoline-powered vehicle or a new energy vehicle, such as a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle. A battery device 100 is mounted on the chassis of the vehicle 200. The battery device 100 can be used to power the vehicle 200 and can serve as the operating power source for the vehicle 200. The vehicle 200 may also include a controller 201 and a motor 202. The controller 201 controls the battery device 100 to supply power to the motor 202 for the vehicle 200's starting, navigation, and driving power needs.

[0071] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 200, but also as the driving power source for the vehicle 200, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 200.

[0072] The following is for reference. Figures 2-11 A battery device 100 according to an embodiment of this application is described.

[0073] like Figure 2 , Figure 3 , Figure 4 , Figure 8 and Figure 9 As shown, the battery device 100 according to an embodiment of this application includes: a battery assembly 10 and a side plate structure 20. The battery assembly 10 includes at least one battery cell 11. The side plate structure 20 is provided on at least one side of the battery assembly 10. The side plate structure 20 includes: a side plate body 21 and an insulating film 22. The side plate body 21 includes a side plate 211 and a heat insulation layer 212. The heat insulation layer 212 is fixed to the side plate 211. The side plate 211 and the heat insulation layer 212 are stacked along the thickness direction of the side plate 211. The insulating film 22 covers at least a portion of the side plate 211 and at least a portion of the heat insulation layer 212, and the insulating film 22 is fixed to the side plate 211 and the heat insulation layer 212.

[0074] The battery device 100 may further include a housing 40, which may include a first housing 41 and a second housing 42. The first housing 41 and the second housing 42 are fastened together, forming an installation cavity inside the housing 40. The installation cavity can accommodate the battery assembly 10, which is installed within the installation cavity. The first housing 41 may be one of an upper housing and a lower housing, and the second housing 42 may be the other of an upper housing and a lower housing. This application uses the second housing 42 as an example of a lower housing. The number of battery assemblies 10 can be one, two, three, four, etc. This application uses the example of multiple battery assemblies 10, i.e., the number of battery assemblies 10 is greater than or equal to two. Figure 3 As shown, the battery assembly 10 may include a plurality of battery cells 11, which may be arranged sequentially along the thickness direction of the battery cells 11.

[0075] The battery assembly 10 has a side plate structure 20 on at least one side. As an example, the battery assembly 10 has a side plate structure 20 on one side. As another example, the battery assembly 10 has side plate structures 20 on opposite sides. Figure 3 As shown, the battery assembly 10 has multiple battery cells 11 arranged in a manner that... Figure 3 When placed in the center direction, the height direction of the battery assembly 10 is... Figure 3 In the Z-direction, along the height direction of the battery assembly 10, side plate structures 20 can be provided on the upper side of multiple battery cells 11, and side plate structures 20 can also be provided on the lower side of multiple battery cells 11. For example... Figure 3 As shown, in the circumferential direction of the battery assembly 10, the sides of the multiple battery cells 11 may also be provided with side plate structures 20.

[0076] As an example, the battery device 100 includes a battery assembly 10, two end plates, and two side plate structures 20. The two end plates are arranged opposite to each other and spaced apart, and the two side plates 211 are arranged opposite to each other and spaced apart. The two end plates and the two side plate structures 20 enclose a space for mounting a plurality of battery cells 11, and the plurality of battery cells 11 are mounted within the space enclosed by the two end plates and the two side plate structures 20.

[0077] The side panel structure 20 includes a side panel body 21 and an insulating film 22. The side panel body 21 includes a side panel 211 and a heat insulation layer 212. The side panel 211 and the heat insulation layer 212 are stacked along the thickness direction of the side panel 211. The heat insulation layer 212 can be a mica plate, but this application is not limited to this. The heat insulation layer 212 can also be other structures, as long as it can play a heat insulation role. The heat insulation layer 212 can be located on the side of the side panel 211 away from the battery cell 11. The heat insulation layer 212 is fixed to the side panel 211. The heat insulation layer 212 can be bonded to the side panel 211 by an adhesive layer 213. The adhesive layer 213 is located between the heat insulation layer 212 and the side panel 211. The heat insulation layer 212 can also be snapped to the side panel 211.

[0078] The insulating film 22 covers at least a portion of the outer surface of the side plate 211 and also covers at least a portion of the outer surface of the heat insulation layer 212. The insulating film 22 is fixedly connected to the side plate 211 and the heat insulation layer 212. The insulating film 22 can be simultaneously bonded to the side plate 211 and the heat insulation layer 212. The insulating film 22 can also form a ring structure by connecting its own ends, thereby tightly wrapping the outer surfaces of the side plate 211 and the heat insulation layer 212. By covering the side plate 211 and the heat insulation layer 212 with the insulating film 22 and fixing the insulating film 22 to the side plate 211 and the heat insulation layer 212, the heat insulation layer 212 can be reliably fixed to the side plate 211. If the heat insulation layer 212 is partially or completely delaminated under mechanical conditions such as vibration and impact, the insulating film 22 can play a secondary protection role, which can reliably fix the heat insulation layer 212 to the side plate 211, reduce the risk of the heat insulation layer 212 falling off the side plate 211, help maintain the heat transfer barrier function of the side plate structure 20, help improve the heat diffusion protection performance of the battery device 100, thereby improving the reliability of the battery device 100, and also help reduce the risk of abnormal noise in the battery device 100 caused by the heat insulation layer 212 falling off.

[0079] In the above technical solution, by setting the insulating film 22, the heat insulation layer 212 can be reliably fixed to the side plate 211, reducing the risk of the heat insulation layer 212 falling off the side plate structure 20, which is beneficial to improving the reliability of the battery device 100, and also helps to reduce the risk of abnormal noise in the battery device 100.

[0080] According to some embodiments of this application, such as Figure 4 and Figure 8 As shown, the insulating film 22 is arranged around the side plate body 21 in a first direction, which is perpendicular to the thickness direction of the side plate structure 20.

[0081] Among them, when the side plate structure 20 is Figure 4 When placed in the center direction, the first direction is Figure 4 In the X direction, Figure 8 The first direction is Figure 8The thickness direction of the side plate structure 20 is perpendicular to the paper surface. Figure 8 The insulating film 22 extends around the first direction, so that it surrounds the side plate body 21. The portion of the insulating film 22 opposite to the side plate 211 is fixed to the side plate 211, and the portion of the insulating film 22 opposite to the heat insulation layer 212 is fixed to the heat insulation layer 212. The insulating film 22 can be arranged around the side plate body 21 in 0.25 turns, 0.5 turns, 0.7 turns, or 1 turn, etc., around the first direction.

[0082] As an example, the insulating film 22 is a non-annular structure. The insulating film 22 is arranged around the side plate body 21 in a first direction by 0.5 turns around the side plate body 21. The insulating film 22 can be a "U-shaped" structure or a similar "U-shaped" structure. A portion of the side plate body 21 is located between two side wall portions of the insulating film 22. At least a portion of the side plate 211 and at least a portion of the heat insulation layer 212 are located between the two side wall portions. The side wall portion corresponding to the side plate 211 is fixed to the side plate 211, and the side wall portion corresponding to the heat insulation layer 212 is fixed to the heat insulation layer 212.

[0083] As another example, such as Figure 8 As shown, the insulating film 22 can be a ring structure, that is, the insulating film 22 is a closed ring structure. The insulating film 22 is sleeved on the side plate body 21. At least part of the side plate 211 and the heat insulation layer 212 are located inside the insulating film 22. The area of ​​the insulating film 22 corresponding to the side plate 211 is fixed to the side plate 211, and the area of ​​the insulating film 22 corresponding to the heat insulation layer 212 is fixed to the heat insulation layer 212.

[0084] In the above technical solution, the insulating film 22 is arranged around the side plate body 21 in the first direction, which facilitates the insulating film 22 to cover the side plate 211 and the heat insulation layer 212, facilitates the production and manufacturing of the side plate structure 20, and helps to improve the production efficiency of the side plate structure 20, thereby making the structural design of the insulating film 22 reasonable.

[0085] According to some embodiments of this application, such as Figure 8 As shown, the insulating film 22 is annular so that the insulating film 22 is fitted onto the side plate body 21.

[0086] The insulating film 22 can be a ring structure, that is, the insulating film 22 is a closed ring structure. The insulating film 22 is arranged around the side plate body 21 in a first direction. The insulating film 22 covers the side plate body 21 in a whole circle. The insulating film 22 wraps the side plate 211 and the heat insulation layer 212. At least part of the side plate 211 and the heat insulation layer 212 are located inside the insulating film 22. The surface of the side plate 211 facing the insulating film 22 is fixedly connected to the insulating film 22. The surface of the heat insulation layer 212 facing the insulating film 22 is fixedly connected to the insulating film 22.

[0087] In the above technical solution, by making the insulating film 22 annular and fitted onto the side plate body 21, it is beneficial to increase the relative area between the insulating film 22 and the side plate 211, and also to increase the relative area between the insulating film 22 and the heat insulation layer 212. This increases the connection area between the insulating film 22 and the side plate 211 and the heat insulation layer 212, thereby more reliably fixing the heat insulation layer 212 to the side plate 211, further reducing the risk of the heat insulation layer 212 falling off the side plate structure 20, which is more conducive to improving the reliability of the battery device 100, and also more conducive to reducing the risk of abnormal noise in the battery device 100. In addition, the insulating film 22 can shield the edge of the heat insulation layer 212, reducing the intrusion of external moisture, dust and other pollutants from the edge of the heat insulation layer 212 between the side plate 211 and the heat insulation layer 212, reducing the impact of external moisture, dust and other pollutants on the adhesion performance of the adhesive layer 213, reducing the risk of the adhesive layer 213 falling off, and improving the environmental adaptability of the battery device 100.

[0088] According to some embodiments of this application, such as Figures 8-11 As shown, along the direction of the insulating film 22 surrounding the side plate body 21, the two ends of the insulating film 22 are respectively formed with a first overlapping section 225 and a second overlapping section 226, and the first overlapping section 225 and the second overlapping section 226 are stacked and fixedly connected.

[0089] The insulating film 22 is disposed around the side plate body 21 in a first direction. The extension direction of the insulating film 22 refers to the direction in which the insulating film 22 extends around the first direction, along the direction in which the insulating film 22 surrounds the side plate body 21. A first overlapping section 225 and a second overlapping section 226 are respectively formed at both ends of the insulating film 22. Alternatively, along the direction in which the insulating film 22 surrounds the side plate body 21, one end of the insulating film 22 has a first overlapping section 225, and the other end has a second overlapping section 226. The first overlapping section 225 and the second overlapping section 226 are stacked and fixedly connected. The first overlapping section 225 and the second overlapping section 226 can be bonded together, fixed together by fasteners, or snap-fitted together.

[0090] In the above technical solution, a first overlapping section 225 and a second overlapping section 226 are formed at both ends of the insulating film 22, and the first overlapping section 225 and the second overlapping section 226 are fixedly connected. This can make the insulating film 22 form a ring structure, or make the insulating film 22 tightly wrap around the side plate 211 and the heat insulation layer 212, so that the insulating film 22 can be reliably wrapped around the outside of the side plate body 21.

[0091] According to some embodiments of this application, the first overlap section 225 and the second overlap section 226 are located on the side of the side panel 211 away from the heat insulation layer 212; or the first overlap section 225 and the second overlap section 226 are located on the side of the heat insulation layer 212 away from the side panel 211.

[0092] As an example, such as Figure 9 and Figure 11 As shown, the first overlapping section 225 and the second overlapping section 226 overlap to form an overlapping area 227. Along the thickness direction of the side plate 211, the overlapping area 227 is located on the side of the side plate 211 away from the heat insulation layer 212.

[0093] As another example, the first overlapping section 225 and the second overlapping section 226 overlap to form an overlapping area 227. Along the thickness direction of the side plate 211, the overlapping area 227 is located on the side of the insulation layer 212 away from the side plate 211.

[0094] In the above technical solution, by setting the first overlapping section 225 and the second overlapping section 226 on the side of the side plate 211 away from the heat insulation layer 212, or by setting the first overlapping section 225 and the second overlapping section 226 on the side of the heat insulation layer 212 away from the side plate 211, the connection position of the first overlapping section 225 and the second overlapping section 226 is located on the side with a larger surface area of ​​the side plate body 21. This facilitates the overlapping connection of the first overlapping section 225 and the second overlapping section 226, which helps to reduce the production difficulty of the side plate structure 20, thereby improving the production efficiency of the side plate structure 20, and further improving the production efficiency of the battery device 100.

[0095] According to some embodiments of this application, such as Figure 4 and Figure 5 As shown, at least one end of the insulating film 22 is formed with a sealing portion along the first direction. At least a portion of the sealing portion extends out of the side plate body 21 along the first direction. The sealing portion includes a first sealing section 223 and a second sealing section 224. The first sealing section 223 and the second sealing section 224 are opposite to each other and fixedly connected along the thickness direction of the side plate structure 20.

[0096] In this design, a sealing portion is formed at one end of the insulating film 22 along the first direction, or sealing portions are formed at both ends of the insulating film 22. A portion of the sealing portion extends out of the side plate body 21 along the first direction, or the entire sealing portion extends out of the side plate body 21 along the first direction. The first sealing segment 223 and the second sealing segment 224 can be bonded together to fix the first sealing segment 223 and the second sealing segment 224 together.

[0097] In the above technical solution, by connecting the first sealing section 223 and the second sealing section 224 relative to each other and fixedly connected along the thickness direction of the side plate 211, the insulating film 22 can cover the end position of the side plate body 21 along the first direction. The insulating film 22 can block the edge position of the heat insulation layer 212, which is conducive to the complete coverage of the heat insulation layer 212. This further reduces the intrusion of external moisture, dust and other pollutants from the edge position of the heat insulation layer 212 between the side plate 211 and the heat insulation layer 212, further reduces the impact of external moisture, dust and other pollutants on the adhesive performance of the adhesive layer 213, further reduces the risk of the adhesive layer 213 falling off, and is more conducive to improving the environmental adaptability of the battery device 100.

[0098] According to some embodiments of this application, the heat insulation layer 212 is located on the side of the side panel 211 facing away from the battery assembly 10.

[0099] In this battery assembly 10, the individual battery cells 11 can be bonded and fixed to the side plate structure 20. The heat insulation layer 212 is disposed on the side of the side plate 211 away from the battery assembly 10, so that the side plate 211 faces the battery assembly 10. This helps to maintain the surface flatness of the side plate structure 20 facing the battery assembly 10, and allows the individual battery cells 11 to be reliably bonded to the side plate structure 20. Furthermore, when multiple battery assemblies 10 are disposed in the battery device 100, if a battery assembly 10 experiences thermal runaway, the heat insulation layer 212 can block the heat diffusion between multiple battery assemblies 10, improve the heat diffusion protection capability of the battery device 100, and further improve the reliability of the battery device 100.

[0100] In the above technical solution, by setting the heat insulation layer 212 on the side of the side plate 211 away from the battery assembly 10, it is beneficial to maintain the surface flatness of the side plate structure 20 facing the battery assembly 10, so that the battery cell 11 can be reliably bonded to the side plate structure 20, and the heat diffusion between the battery assembly 10 can be reduced, thus making the position of the heat insulation layer 212 reasonable.

[0101] According to some embodiments of this application, such as Figures 8-10 As shown, the insulating film 22 includes a first sub-insulating portion 221 and a second sub-insulating portion 222. The first sub-insulating portion 221 and the second sub-insulating portion 222 are arranged and connected along the extending direction of the insulating film 22. The first sub-insulating portion 221 is located on the side of the side plate 211 away from the heat insulation layer 212, and the second sub-insulating portion 222 is located on the side of the side plate 211 facing the heat insulation layer 212.

[0102] The insulating film 22 may include a first sub-insulating portion 221 and a second sub-insulating portion 222. The first sub-insulating portion 221 and the second sub-insulating portion 222 are arranged along the extension direction of the insulating film 22 and are connected to each other. The first sub-insulating portion 221 and the second sub-insulating portion 222 are integrally formed. Along the thickness direction of the side plate 211, the first sub-insulating portion 221 is located on the side of the side plate 211 away from the heat insulation layer 212 and is fixedly connected to the side plate 211. The second sub-insulating portion 222 is located on the side of the side plate 211 facing the heat insulation layer 212 and is fixedly connected to the heat insulation layer 212. At least a portion of the second sub-insulating portion 222 is located on the side of the heat insulation layer 212 away from the side plate 211 and is fixed to the heat insulation layer 212.

[0103] Along the second direction of the side plate structure 20, with both ends of the side plate 211 and both ends of the insulation layer 212 aligned, the entire structure of the second sub-insulation part 222 is located on the side of the insulation layer 212 away from the side plate 211, and the entire structure of the second sub-insulation part 222 is fixed to the insulation layer 212. For example... Figure 9 As shown, along the second direction of the side plate structure 20, when both ends of the side plate 211 extend beyond the two ends of the insulation layer 212, part of the structure of the second sub-insulation part 222 is opposite to and fixed to the side plate 211 along the thickness direction of the side plate 211, and another part of the structure of the second sub-insulation part 222 is opposite to and fixed to the insulation layer 212.

[0104] As one example, the first overlapping section 225 and the second overlapping section 226 are located on the side of the side plate 211 away from the heat insulation layer 212, and the first sub-insulation portion 221 includes two parts, with the first overlapping section 225 and the second overlapping section 226 respectively formed on the two parts of the first sub-insulation portion 221. As another example, the first overlapping section 225 and the second overlapping section 226 are located on the side of the heat insulation layer 212 away from the side plate 211, and the second sub-insulation portion 222 includes two parts, with the first overlapping section 225 and the second overlapping section 226 respectively formed on the two parts of the second sub-insulation portion 222.

[0105] like Figure 8 , Figure 10 and Figure 11As shown, the insulating film 22 may further include a third sub-insulating portion 228. Along the second direction, a third sub-insulating portion 228 is provided on both sides of the side plate body 21. The third sub-insulating portion 228 connects between the first sub-insulating portion 221 and the second sub-insulating portion 222. The first sub-insulating portion 221, the second sub-insulating portion 222, and the third sub-insulating portion 228 are integrally formed, and the third sub-insulating portion 228 is fixed to the side plate 211. By providing the third sub-insulating portion 228, the connection effect between the first sub-insulating portion 221 and the second sub-insulating portion 222 is achieved.

[0106] In the above technical solution, the first sub-insulation part 221 is located on the side of the side plate 211 away from the heat insulation layer 212, and the second sub-insulation part 222 is located on the side of the side plate 211 facing the heat insulation layer 212, which is beneficial to ensure that the insulation film 22 reliably covers the side plate 211 and the heat insulation layer 212.

[0107] According to some embodiments of this application, such as Figure 4 and Figure 5 As shown, along the first direction, a first sealing section 223 is formed at the end of the first sub-insulating part 221, and a second sealing section 224 is formed at the corresponding end of the second sub-insulating part 222. The first sealing section 223 and the second sealing section 224 both extend out of the side plate body 21 along the first direction, and the first sealing section 223 and the second sealing section 224 are opposite to each other and fixedly connected along the thickness direction of the side plate 211.

[0108] In this embodiment, along the first direction, at least one end of the first sub-insulating portion 221 is formed with a first sealing section 223, and at least one end of the second sub-insulating portion 222 is formed with a second sealing section 224. This application describes an example where both ends of the first sub-insulating portion 221 are formed with the first sealing section 223, and both ends of the second sub-insulating portion 222 are formed with the second sealing section 224. Along the first direction, the first sealing section 223 and the second sealing section 224 at the same end of the first sub-insulating portion 221 and the second sub-insulating portion 222 are disposed opposite each other along the thickness direction of the side plate 211. At least a portion of the structure of the first sealing section 223 extends out of the corresponding end of the side plate body 21 along the first direction, and at least a portion of the structure of the second sealing section 224 extends out of the corresponding end of the side plate body 21 along the first direction. The first sealing section 223 and the opposing second sealing section 224 are fixedly connected.

[0109] In the above technical solution, by connecting the first sealing section 223 and the second sealing section 224 relative to each other and fixedly connected along the thickness direction of the side plate 211, the insulating film 22 can cover the end position of the side plate body 21 along the first direction. The insulating film 22 can block the edge position of the heat insulation layer 212, which is conducive to the complete coverage of the heat insulation layer 212. This further reduces the intrusion of external moisture, dust and other pollutants from the edge position of the heat insulation layer 212 between the side plate 211 and the heat insulation layer 212, further reduces the impact of external moisture, dust and other pollutants on the adhesive performance of the adhesive layer 213, further reduces the risk of the adhesive layer 213 falling off, and is more conducive to improving the environmental adaptability of the battery device 100.

[0110] According to some embodiments of this application, the battery cell 11 has a pressure relief structure 111, such as Figure 5 and Figure 9 As shown, the battery device 100 also includes a protective structure 30, which has a first protective part 31 located on the side of the side plate structure 20 facing the battery assembly 10. The side plate structure 20 has a first side edge 23, and the first side edge 23 and the pressure relief structure 111 are located on the same side of the battery device 100. The first protective part 31 is arranged along the extending direction of the first side edge 23.

[0111] The battery assembly 100 may further include a protective structure 30. The material of the protective structure 30 may be an insulating material or a heat-insulating material, giving the protective structure 30 the functions of heat protection and insulation protection. As an example, the protective structure 30 may be fitted onto the first side edge 23 of the side plate structure 20. As another example, the protective structure 30 may also be fitted onto the entire edge of the side plate body 21. When the insulating film 22 covers the entire side plate body 21, the protective structure 30 is located outside the insulating film 22, that is, the protective structure 30 is located on the side of the insulating film 22 away from the side plate body 21, and the protective structure 30 is fitted onto the edge of the side plate structure 20. The protective structure 30 may be fixed to the insulating film 22 or adhered to the insulating film 22. Along the height direction of the battery assembly 10, the protective structure 30 and the pressure relief structure 111 of the battery cell 11 are located on the same side of the battery assembly 10. As an example, such as Figure 3 and Figure 9 As shown, a pressure relief structure 111 is provided at the upper end of the battery cell 11, the upper edge of the side plate structure 20 is the first side edge 23, and the first protective part 31 extends along the extending direction of the upper edge of the side plate structure 20. The protective structure 30 can be a "U-shaped" structure or a similar "U-shaped" structure. It should be noted that the manufacturing material of the protective structure 30 is not specifically limited, as long as the protective structure 30 has the functions of insulation and heat insulation.

[0112] In the above technical solution, by setting the protective structure 30, when the material inside the battery cell 11 is ejected from the pressure relief structure 111, the protective structure 30 can block the material ejected from the battery cell 11, reduce the risk of short circuit caused by the overlap between the battery cell 11 and the side plate 211, and help improve the reliability of the battery device 100.

[0113] According to some embodiments of this application, such as Figure 5 and Figure 9 As shown, the protective structure 30 also includes a second protective part 33 and a third protective part 34. The third protective part 34 is located on the side of the side plate structure 20 facing away from the battery assembly 10. The second protective part 33 connects the first protective part 31 and the second protective part 33, so that the protective structure 30 is fitted onto the first side edge 23 of the side plate structure 20.

[0114] The first protective part 31, the second protective part 33 and the third protective part 34 together define an installation space 32 with an open end. After the protective structure 30 is fitted onto the first side edge 23 of the side plate structure 20, the first protective part 31 is located on the side of the side plate structure 20 facing the battery assembly 10, and at least a portion of the first side edge 23 is located within the installation space 32 of the protective structure 30.

[0115] The third protective part 34 and the first protective part 31 are opposite to and spaced apart. The third protective part 34 is located on the side of the side plate structure 20 away from the battery assembly 10. The second protective part 33 is connected between the third protective part 34 and the first protective part 31 so that the protective structure 30 defines the mounting space 32. A portion of the side plate structure 20 is assembled into the mounting space 32. The first protective part 31, the second protective part 33, and the third protective part 34 can be integrally formed. The third protective part 34 and the first protective part 31 are arranged opposite to and spaced apart along the thickness direction of the side plate structure 20. The third protective part 34 and the first protective part 31 can be parallel to each other. The third protective part 34 is located on the side of the side plate structure 20 away from the battery assembly 10. The second protective part 33 is connected between the third protective part 34 and the first protective part 31 so that the first protective part 31, the second protective part 33, and the third protective part 34 together define the mounting space 32. A portion of the side plate structure 20 is assembled into the mounting space 32. The first side edge 23 of the side plate structure 20 is assembled into the mounting space 32.

[0116] In the above technical solution, by providing the first protective part 31, the second protective part 33, and the third protective part 34, the protective structure 30 can define the installation space 32, achieving the effect of the protective structure 30 being fitted onto the first side edge 23 of the side plate structure 20. The protective structure 30 being fitted onto the first side edge 23 of the side plate structure 20 facilitates its assembly, and the first protective part 31 can be reliably positioned on the side of the side plate structure 20 facing the battery assembly 10.

[0117] In some embodiments, the protective structure 30 is fixed to the side plate structure 20.

[0118] The protective structure 30 can be bonded to the insulating film 22 of the side panel structure 20. The protective structure 30 can also be fixed to the side panel structure 20 using fasteners. Alternatively, the protective structure 30 can be snap-fitted to the side panel structure 20.

[0119] In the above technical solution, by fixing the protective structure 30 to the side plate structure 20, the risk of the protective structure 30 detaching from the side plate structure 20 is reduced, and the protective structure 30 is reliably assembled to the side plate structure 20. When the material inside the battery cell 11 is ejected from the pressure relief structure 111, the protective structure 30 can reliably shield the material ejected from the battery cell 11, further reducing the risk of short circuit caused by the overlap between the battery cell 11 and the side plate 211, which is more conducive to improving the reliability of the battery device 100.

[0120] It should be noted that the insulating film 22 can be made of insulating material. The insulating film 22 covers the outer surface of the side panel body 21, which helps improve the insulation performance and environmental adaptability of the side panel structure 20, ensuring that the side panel structure 20 meets creepage distance and clearance requirements. The insulating film 22 reduces the risk of electrical connection between the side panel 211 and other components, reduces the risk of short circuits in the battery assembly 10 under humid or polluted environments, further reduces the risk of short circuits in the battery device 100, and improves the reliability of the battery device 100. The insulating film can be made of PET film, which has good flexibility and is easy to mold, allowing it to conform to the shape of the side panel body 21. After the heat insulation layer 212 is bonded to the side plate 211, the insulating film extends around the side plate body 21 in a first direction to surround the side plate body 21. Then, the insulating film is softened by hot pressing (exemplary, temperature is 150-200℃, pressure is 3-5Mpa), so that the insulating film is tightly attached to the side plate 211 and the heat insulation layer 212, and the insulating film is fixedly connected to the side plate 211 and the heat insulation layer 212.

[0121] By using a hot-pressing process to form a tightly wrapped layer of insulating film around the side plate 211 and the heat insulation layer 212, the intrusion of pollutants such as moisture and dust can be reduced. This effectively reduces the adverse effects of external environmental factors (such as humidity and temperature changes) on the adhesive performance of the adhesive layer 213, helps maintain the long-term reliability of the side plate body 21, meets the creepage distance requirements of the side plate structure 20, and even if the heat insulation layer 212 experiences local delamination under mechanical conditions such as vibration and impact, the wrapped insulating film can provide secondary protection, reducing the risk of the heat insulation layer 212 falling off and helping to extend the service life of the battery device 100.

[0122] According to some embodiments of this application, the heat insulation layer 212 can be a mica board. The insulation strength of the mica board can reach the KV level breakdown voltage standard, which can effectively reduce the risk of electrical conduction path between the battery module 10 and the external metal parts, physically block the risk of short circuit, and further improve the reliability of the battery device 100.

[0123] The battery device 100 of this application can not only improve the protection performance and insulation characteristics of the battery module 10, but also enhance the working stability of the battery module 10.

[0124] In some embodiments, the manufacturing process of the side panel structure 20 is as follows:

[0125] The side panel 211 is stamped and formed. The outer surface of the side panel 211 is cleaned with lint-free paper soaked in alcohol to ensure that there are no oil stains, oil marks, mold release agents, debris, dust and other residues, and the surface energy meets the requirement of ≥32mN / m. The heat insulation layer 212 and the double-sided adhesive layer 213 are integrally formed, and the heat insulation layer 212 is pasted to the surface of the side panel 211 by positioning fixtures.

[0126] An insulating film 22 wraps around the side panel body 21. The insulating film 22 is then sealed along the inner side of the side panel 211. Using CNC hot pressing equipment, at 150-200℃ and 3-5 MPa, a composite layer is formed from the side panel 211, the heat insulation layer 212, and the insulating film 22. A protective structure 30 is then attached to the edge of the side panel structure 20. After the side panel structure 20 is formed, it undergoes a shaping process using tooling to ensure that its contours, flatness, and other dimensional features meet the requirements.

[0127] like Figure 1 As shown, the electrical device according to an embodiment of this application includes the battery device 100 described above. By employing the aforementioned battery device 100, the reliability of the electrical device is improved, and the risk of abnormal noise from the electrical device due to the detachment of the heat insulation layer 212 is also reduced.

[0128] According to some embodiments of this application, see Figure 4As shown, this application provides a battery device 100, including a battery assembly 10 and a side plate structure 20. The battery assembly 10 includes at least one battery cell 11. The side plate structure 20 is provided on at least one side of the battery assembly 10. The side plate structure 20 includes a side plate body 21 and an insulating film 22. The side plate body 21 includes stacked side plates 211 and a heat insulation layer 212. The heat insulation layer 212 is located on the side of the side plate 211 away from the battery assembly 10 and is fixed to the side plate 211. The insulating film 22 is an integrally formed structure that covers the entire side plate body 21 and is fixed to the side plate 211 and the heat insulation layer 212. A protective structure 30 is sleeved at the first side edge 23 of the side plate structure 20. The side panel body 21 may also include an assembly structure 214, which is connected to the side panel 211. The assembly structure 214 can be integrally formed with the side panel 211. The assembly structure 214 can extend an insulating film and is used to assemble with the end plate structure of the battery module.

[0129] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0130] Other components of the battery device 100 according to the embodiments of this application, such as electrical components and operation, are known to those skilled in the art and will not be described in detail here.

[0131] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," 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.

[0132] 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, characterized in that, include: A battery assembly and a side plate structure, the battery assembly including at least one battery cell, the side plate structure being provided on at least one side of the battery assembly, the side plate structure including: a side plate body and an insulating film, the side plate body including a side plate and a heat insulation layer, the heat insulation layer being fixed to the side plate, the side plate and the heat insulation layer being stacked along the thickness direction of the side plate, the insulating film covering at least a portion of the side plate and at least a portion of the heat insulation layer, and the insulating film being fixed to the side plate and the heat insulation layer.

2. The battery device according to claim 1, characterized in that, The insulating film is disposed around the side plate body in a first direction, which is perpendicular to the thickness direction of the side plate structure.

3. The battery device according to claim 2, characterized in that, Along the direction of the insulating film surrounding the main body of the side plate, a first overlapping section and a second overlapping section are respectively formed at both ends of the insulating film, and the first overlapping section and the second overlapping section are stacked and fixedly connected.

4. The battery device according to claim 3, characterized in that, The first overlap section and the second overlap section are located on the side of the side plate away from the insulation layer; or The first overlap section and the second overlap section are located on the side of the insulation layer away from the side panel.

5. The battery device according to claim 2, characterized in that, Along the first direction, at least one end of the insulating film is formed with a sealing portion, at least a portion of the sealing portion extends out of the side plate body along the first direction, the sealing portion includes a first sealing section and a second sealing section, the first sealing section and the second sealing section are opposite to each other and fixedly connected along the thickness direction of the side plate structure.

6. The battery device according to any one of claims 1-5, characterized in that, The heat insulation layer is located on the side of the side panel opposite to the battery assembly.

7. The battery device according to any one of claims 1-5, characterized in that, The battery cell has a pressure relief structure, and the battery device further includes a protective structure. The protective structure has a first protective part located on the side of the side plate structure facing the battery assembly. The side plate structure has a first side edge, and the first side edge and the pressure relief structure are located on the same side of the battery device. The first protective part is arranged along the extending direction of the first side edge.

8. The battery device according to claim 7, characterized in that, The protective structure further includes a second protective part and a third protective part. The third protective part is located on the side of the side plate structure facing away from the battery assembly. The second protective part connects the first protective part and the second protective part, so that the protective structure is fitted onto the first side edge of the side plate structure.

9. The battery device according to claim 7, characterized in that, The protective structure is fixed to the side plate structure.

10. An electrical device, characterized in that, Includes the battery device according to any one of claims 1-9.

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