Battery device, processing method thereof and power utilization device

Abstract

The invention is applicable to the technical field of batteries, and provides a battery device and a processing method thereof, and a power utilization device, the battery device comprises: a box body having an accommodating space; a battery cell assembly accommodated in the accommodation space; the bonding structure comprises a first adhesive layer, a middle carrier and a second adhesive layer, the first adhesive layer is connected to the battery monomer assembly, the middle carrier is connected to the side, deviating from the battery monomer assembly, of the first adhesive layer, one side of the second adhesive layer is connected to the side, facing the containing space, of the box body, and the other side of the second adhesive layer is connected to the side, deviating from the first adhesive layer, of the middle carrier; the first glue layer comprises a glue solution with first viscosity, the second glue layer comprises a glue solution with second viscosity, and the first viscosity is greater than the second viscosity; in the battery device provided by the embodiment of the invention, the viscosity of the first adhesive layer is greater than that of the second adhesive layer, so that the risk that the first adhesive layer overflows to the side surface with a relatively large area of the battery monomer is reduced, and the risk of stress concentration after the first adhesive layer is cured can be reduced.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In current battery devices, battery cells are usually bonded and fixed inside the housing by structural adhesive applied to the bottom of the housing. During the process of pre-pressing the battery cells onto the structural adhesive, the structural adhesive is prone to overflowing between the larger sides of adjacent battery cells, and stress concentration and damage to battery cells are likely to occur after the structural adhesive cures. Summary of the Invention

[0004] In view of the above problems, this application provides a battery device and its processing method, as well as an electrical device, which can alleviate the problem of glue overflowing between the larger side surfaces of adjacent battery cells, causing the battery cells to be easily damaged.

[0005] In a first aspect, embodiments of this application provide a battery device, comprising: The enclosure has a receiving space; a battery cell assembly is housed within the receiving space; an adhesive structure includes a first adhesive layer, an intermediate carrier, and a second adhesive layer. The first adhesive layer is connected to the battery cell assembly, the intermediate carrier is connected to the side of the first adhesive layer opposite to the battery cell assembly, one side of the second adhesive layer is connected to the side of the enclosure facing the receiving space, and the other side of the second adhesive layer is connected to the side of the intermediate carrier opposite to the first adhesive layer. The first adhesive layer comprises an adhesive liquid of a first viscosity, and the second adhesive layer comprises an adhesive liquid of a second viscosity, wherein the first viscosity is greater than the second viscosity. In the arrangement direction of the battery cell assembly and the adhesive structure, the first adhesive layer is staggered from the battery cell assembly; or, in the arrangement direction of the battery cell assembly and the adhesive structure, a portion of the first adhesive layer extends to the periphery of the battery cell assembly, and the ratio of the size of the portion of the first adhesive layer extending to the periphery of the battery cell assembly to the size of the battery cell assembly is less than or equal to 5%.

[0006] In this embodiment, an adhesive structure is provided, comprising a first adhesive layer, an intermediate carrier, and a second adhesive layer. The battery cell is bonded to the intermediate carrier by the first adhesive layer, and the intermediate carrier is bonded and fixed to the housing by the second adhesive layer, thereby fixing the battery cell inside the housing. The viscosity of the first adhesive layer is greater than that of the second adhesive layer, so that the first adhesive layer has poor flowability and is less likely to extend to the side of the battery cell or the height of the first adhesive layer extending to the side of the battery cell is lower, reducing the risk of the first adhesive layer overflowing to the side of the battery cell with a larger area, thereby reducing the risk of stress concentration after the first adhesive layer cures.

[0007] In some embodiments, the first viscosity is greater than or equal to 100,000 mPa·s.

[0008] The technical solution of this embodiment provides some viscosity ranges for the first adhesive layer to further reduce the fluidity of the first adhesive layer and reduce the risk of the first adhesive layer overflowing to the side with a larger area of ​​the battery cell, thereby reducing the risk of stress concentration after the first adhesive layer is cured.

[0009] In some embodiments, the material of the first adhesive layer includes epoxy adhesive and / or UV-curable adhesive.

[0010] The technical solution of this embodiment provides some material selection for the first adhesive layer, so that the first adhesive layer includes epoxy adhesive and / or light-curing adhesive, so that the first adhesive layer can not only bond to the battery cell relatively stably, but also have low fluidity and facilitate curing of the first adhesive layer.

[0011] In some embodiments, the second viscosity is less than or equal to 20000 mPa·s.

[0012] The technical solution of this embodiment provides some viscosity ranges for the second adhesive layer to facilitate the application of the second adhesive layer, so that the second adhesive layer can better cover the corresponding wall surface of the box, so as to better bond the intermediate carrier to the box; at the same time, it can also limit the viscosity of the first adhesive layer from the side, so that the flow of the first adhesive layer is poor, reducing the risk of the first adhesive layer overflowing to the side with a large area of ​​the battery cell.

[0013] In some embodiments, the material of the second adhesive layer includes polyurethane structural adhesive.

[0014] The technical solution of this embodiment provides some material options for the second adhesive layer, so that the second adhesive layer can not only better bond the intermediate carrier to the box, but also facilitate the application of the second adhesive layer.

[0015] In some embodiments, the intermediate carrier is an insulating structural component.

[0016] In the technical solution of this embodiment, the intermediate carrier is an insulating structural component to reduce the risk of short circuit between the battery cell and the casing.

[0017] In some embodiments, the intermediate carrier is made of plastic.

[0018] The technical solution of this embodiment provides some specific materials for the intermediate carrier, which enables the first adhesive layer and the second adhesive layer to adhere well to the intermediate carrier, and also enables the intermediate carrier to have good insulation properties and light weight.

[0019] In some embodiments, the second adhesive layer includes at least two spaced-apart adhesives, each of which is connected to the housing and the intermediate carrier.

[0020] In this embodiment, the second adhesive layer includes at least two spaced adhesives. While the second adhesive layer can provide stable bonding performance, the coverage area of ​​the second adhesive layer is reduced, the amount of adhesive used in the second adhesive layer is reduced, and the cost is lowered.

[0021] In some embodiments, the ratio of the area of ​​the second adhesive layer projected onto the corresponding wall of the housing to the area of ​​the corresponding wall of the housing ranges from 40% to 60%.

[0022] The technical solution of this embodiment further provides a range of coverage area ratios for the second adhesive layer. While the second adhesive layer can provide stable bonding performance, it better reduces the amount of adhesive used in the second adhesive layer and lowers the cost.

[0023] In some embodiments, the thickness of the first adhesive layer is less than the thickness of the second adhesive layer.

[0024] In the technical solution of this embodiment, the thickness of the first adhesive layer is relatively thin. When the first adhesive layer can bond and fix the battery cell assembly to the intermediate carrier, this setting can further reduce the risk of the first adhesive layer overflowing to the side with a larger area of ​​the adjacent battery cell; this setting can also reduce the space occupied by the first adhesive layer.

[0025] In some embodiments, the thickness of the first adhesive layer ranges from 0.5 mm to 1 mm.

[0026] The technical solution of this embodiment provides a range of thicknesses for the first adhesive layer, so that the first adhesive layer can be stably bonded and fixed to the intermediate carrier, and the risk of the first adhesive layer overflowing to the side of the adjacent battery cell with a larger area can be reduced.

[0027] In some embodiments, the thickness of the second adhesive layer ranges from 2 mm to 2.5 mm.

[0028] The technical solution of this embodiment provides a range of thicknesses for the second adhesive layer, so that the second adhesive layer can better and more stably bond and fix the intermediate carrier to the housing; at the same time, making the second adhesive layer thicker also enables the second adhesive layer to play a certain role in buffering and absorbing energy, thereby providing protection for the bottom of the battery cell assembly.

[0029] In some embodiments, the second adhesive layer includes a main body and a fixing part connected to the main body. The main body is located between the wall of the intermediate carrier and the corresponding box. One end of the fixing part is connected to the main body, and the other end of the fixing part extends along the arrangement direction of the first adhesive layer and the second adhesive layer and is at least connected to the periphery of the intermediate carrier.

[0030] The technical solution of this embodiment provides some specific structures for the second adhesive layer, such that the second adhesive layer includes a main body and a fixing part, and the fixing part extends along the arrangement direction of the first adhesive layer and the second adhesive layer, so that the fixing part can be connected to at least the periphery of the intermediate carrier, thereby increasing the connection area between the second adhesive layer and the intermediate carrier and improving the connection stability between the second adhesive layer and the intermediate carrier.

[0031] In some embodiments, the fixing part is connected to the intermediate carrier and the first adhesive layer; or the fixing part is connected to the intermediate carrier, the first adhesive layer and the battery cell assembly.

[0032] In the technical solution of this embodiment, the fixing part can also be connected to the first adhesive layer and / or the battery cell assembly, so as to connect the second adhesive layer, the intermediate carrier, the first adhesive layer and the battery cell assembly through the fixing part, thereby improving the integrity of the adhesive structure and the connection stability between the adhesive structure and the battery cell assembly.

[0033] In some embodiments, the orthographic projection of the intermediate carrier onto the corresponding wall of the housing covers the orthographic projection of the first adhesive layer onto the corresponding wall of the housing; and / or the orthographic projection of the second adhesive layer onto the corresponding wall of the housing covers the orthographic projection of the intermediate carrier onto the corresponding wall of the housing.

[0034] The technical solution of this embodiment provides an area relationship between the first adhesive layer, the intermediate carrier, and the second adhesive layer, such that the area of ​​the first adhesive layer is smaller than the area of ​​the intermediate carrier, and the area of ​​the intermediate carrier is smaller than the area of ​​the second adhesive layer, so that the edge of the second adhesive layer can overflow and form a fixing part, thereby facilitating the connection between the second adhesive layer and the intermediate carrier and the first adhesive layer.

[0035] In some embodiments, the orthographic projection of the battery cell assembly onto the corresponding wall of the housing covers the orthographic projection of the first adhesive layer onto the corresponding wall of the housing.

[0036] In the technical solution of this embodiment, the projected area of ​​the battery cell assembly is greater than or equal to the projected area of ​​the first adhesive layer, so as to reduce the obstruction of the first adhesive layer to the extension of the fixing part to the battery cell assembly, so that the fixing part can also be connected to the battery cell assembly, thereby improving the connection stability between the battery cell assembly and the adhesive structure.

[0037] In some embodiments, the housing includes a top cover, a frame structure, and a bottom plate. The accommodating space extends through the frame structure along a first direction, and the top cover and the bottom plate are respectively connected to the two ends of the frame structure along the first direction. An adhesive structure is connected to the bottom plate, and a fixing part is also connected to the frame structure.

[0038] In this embodiment, the adhesive structure is connected to the base plate, that is, the second adhesive layer is connected to the base plate, and the fixing part is also connected to the frame structure, so as to further increase the bonding area between the adhesive structure and the box, thereby further improving the connection stability between the battery cell assembly, the adhesive structure and the box.

[0039] Secondly, embodiments of this application also provide a method for processing a battery device, comprising: A first adhesive layer is formed on an intermediate carrier; a battery cell assembly is bonded to the first adhesive layer to obtain an intermediate module; a second adhesive layer is formed on the wall of the housing; the intermediate module is placed inside the housing and bonded to the second adhesive layer, wherein the side of the intermediate carrier opposite to the first adhesive layer is bonded to the second adhesive layer.

[0040] In the technical solution of this embodiment, the battery cell assembly is first bonded to the intermediate carrier by the first adhesive layer, so as to facilitate the application of the first adhesive layer and the bonding of the battery cell assembly, reduce the interference of the casing on the application of the first adhesive layer and the battery cell assembly, and reduce the assembly difficulty.

[0041] In some embodiments, after the step of bonding the battery cell assembly to the first adhesive layer, the processing method further includes: curing the first adhesive layer.

[0042] In the technical solution of this embodiment, the first adhesive layer is cured before the intermediate module is bonded to the second adhesive layer, so that the battery cell assembly, the first adhesive layer and the intermediate carrier can be stably connected; at the same time, it can also reduce the interference that the casing may cause to the curing of the first adhesive layer.

[0043] In some embodiments, the step of placing the intermediate module inside the housing and bonding it to the second adhesive layer includes: positioning the projection of the intermediate module onto the wall of the corresponding housing within the second adhesive layer.

[0044] In this embodiment, the projection of the intermediate module onto the corresponding box wall is located within the second adhesive layer, so that the intermediate module is directly facing the second adhesive layer. At the same time, the area of ​​the second adhesive layer is greater than or equal to the projection of the intermediate module onto the corresponding box wall. During the process of pressing the intermediate module against the second adhesive layer, the edge of the second adhesive layer can overflow upward and form a fixing part, so as to better fix the intermediate module in the box.

[0045] In some embodiments, the step of placing the intermediate module inside the housing and bonding it to the second adhesive layer further includes: the edge of the second adhesive layer extending beyond the projection of the intermediate module onto the wall of the corresponding housing by a size ranging from 0.5 to 1 mm.

[0046] The technical solution of this embodiment provides that the edge of the second adhesive layer extends beyond the projected edge of the intermediate module, so that the second adhesive layer can better overflow upward and form a fixing part, thereby better fixing the intermediate module in the box through the fixing part.

[0047] In some embodiments, the step of placing the intermediate module inside the housing and bonding it to the second adhesive layer further includes: applying a preset pressure to the intermediate module so that a portion of the second adhesive layer overflows in a direction away from the corresponding housing wall.

[0048] In the technical solution of this embodiment, the intermediate module is pre-pressed so that the intermediate module can be better bonded to the box body through the second adhesive layer; at the same time, the pre-pressing can also better cause the adhesive to overflow at the edge of the second adhesive layer and form a fixing part.

[0049] In some embodiments, after the step of placing the intermediate module inside the housing and bonding it to the second adhesive layer, the processing method further includes: curing the second adhesive layer.

[0050] In this embodiment, the processing method further includes curing the second adhesive layer so that the second adhesive layer can better bond and fix the intermediate module inside the box.

[0051] In some embodiments, prior to the step of forming the first adhesive layer on the intermediate carrier, the processing method further includes cleaning the walls of the housing and the bottom of the battery cell assembly.

[0052] In the technical solution of this embodiment, the casing wall and battery cell assembly are first cleaned to reduce the interference of impurities on the bonding stability, thereby improving the stability of the battery cell assembly fixed to the casing through the bonding structure.

[0053] Thirdly, embodiments of this application also provide an electrical device, including a battery device provided in some embodiments of the first aspect, or a battery device formed by a processing method provided in some embodiments of the second aspect.

[0054] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0055] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments; Figure 2 This is an exploded view of the battery device provided in some embodiments of this application; Figure 3 This is an exploded structural diagram of a battery cell provided in some embodiments of this application; Figure 4 This is a cross-sectional schematic diagram of a battery device provided in some embodiments of this application; Figure 5 This is an exploded cross-sectional view of a battery device provided in some embodiments of this application; Figure 6 This is a schematic flowchart illustrating the processing method provided in some embodiments of this application.

[0056] The markings in the diagram mean: 1000, vehicles; 100. Battery device; 10. Box body; 101. Storage space; 11. Top cover; 12. Frame structure; 13. Base plate; 20. Battery cell assembly; 21. Battery cell; 211. Housing; 212. End cap; 213. Electrode assembly; 214. Electrode terminal; 30. Adhesive structure; 31. First adhesive layer; 32. Intermediate carrier; 33. Second adhesive layer; 331. Colloid; 332. Main body; 333. Fixing part; 200. Motor; 300. Controller. Detailed Implementation

[0057] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein 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 specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0059] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0060] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0061] In the description of the embodiments 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, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0062] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0063] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0064] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0065] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0066] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0067] Unless otherwise specified, all steps of this application may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the mention that the method may also include step (c) indicates that step (c) may be added to the method in any order; for example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0068] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0069] In current battery devices, individual battery cells are typically bonded to the casing using structural adhesive applied to the bottom surface of the casing. During the pre-pressing process of the battery cells onto the structural adhesive, the adhesive can easily overflow between the larger side surfaces of adjacent battery cells. Specifically, during the battery cell placement and fixing process, structural adhesive is first applied to the bottom surface of the casing, and then the battery cells are placed into the casing and pressed onto the adhesive layer. During the pressing process, due to the fluidity of the structural adhesive, some of it will flow under pressure between the larger side surfaces of two adjacent battery cells. After the structural adhesive cures, the portion located between the larger side surfaces of two adjacent battery cells will form a rigid structure.

[0070] Because battery cells undergo periodic expansion during charge-discharge cycles, the larger side of the battery cell will show more significant expansion deformation during these cycles. When there is cured structural adhesive between two adjacent larger sides of the battery cell, stress concentration is likely to occur during the expansion deformation of the larger side, which can easily lead to damage to the battery cell.

[0071] Based on the above considerations, in order to alleviate the problem of battery cells being easily damaged due to adhesive overflow onto the larger side of adjacent battery cells, this application provides a battery device with an adhesive structure including a first adhesive layer, an intermediate carrier, and a second adhesive layer. The battery cells are bonded to the intermediate carrier by the first adhesive layer, and the intermediate carrier is bonded and fixed to the housing by the second adhesive layer, thereby fixing the battery cells inside the housing; and the viscosity of the first adhesive layer is greater than the viscosity of the second adhesive layer.

[0072] In this battery device, the intermediate carrier is bonded to the battery cell assembly through a first adhesive layer. The viscosity of the first adhesive layer is relatively high, which reduces the fluidity of the first adhesive layer while ensuring that the battery cell assembly is stably bonded to the intermediate carrier. This reduces the possibility of the first adhesive layer overflowing between the larger side surfaces of two adjacent battery cells, thereby reducing the damage that overflow may cause to the battery cells. The second adhesive layer stably bonds the intermediate carrier and the battery cell assembly to the housing, thereby improving the connection stability between the battery cell assembly and the housing.

[0073] The battery device disclosed in this application can be used in electrical devices that use the battery device as a power source or in various energy storage systems that use the battery device as an energy storage element. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0074] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0075] refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery is installed inside the vehicle 1000, and the battery can be located at the bottom, front, or rear of the vehicle 1000. The battery can be used to power the vehicle 1000; for example, the battery can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 300 and a motor 200. The controller 300 is used to control the battery to supply power to the motor 200, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0076] In some embodiments of this application, the battery 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.

[0077] refer to Figure 2 , Figure 2 This is an exploded structural diagram of a battery device 100 provided in some embodiments of this application. The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies 20 for providing voltage and capacity. The battery cell assembly 20 may include a plurality of battery cells 21, which are connected in series, parallel, or mixed connection via a busbar.

[0078] In some embodiments, the battery cell assembly 20 is typically formed by arranging a plurality of battery cells 21.

[0079] As an example, the battery cell assembly 20 can be a battery module, which is formed by arranging and fixing multiple battery cells 21 into an independent module. As an example, the battery module can be formed by bundling multiple battery cells 21 together with cable ties.

[0080] In some embodiments, the battery device 100 may be a battery pack, which includes a housing 10 and one or more battery cell assemblies 20, the battery cell assemblies 20 being housed in the housing 10.

[0081] As an example, the battery cell assembly 20 can be a battery module, which can be housed in the housing 10 by fixing the battery module in the housing 10.

[0082] As an example, the battery cell assembly 20 can also be housed in the housing 10 by directly fixing multiple battery cells 21 to the housing 10.

[0083] As an example, the housing 10 may include a first housing 10 and a second housing 10. The first housing 10 and the second housing 10 are fastened together to form a closed space inside the housing 10 to house the battery cell assembly 20. Here, "closed" refers to covering or closing, and can be sealed or unsealed. The first housing 10 may be a top cover 11 or a bottom plate 13.

[0084] As an example, the housing 10 may include a top cover 11, a frame, and a bottom plate 13. The top cover 11 and the bottom plate 13 are respectively connected to the frame, so that the interior of the housing 10 forms a closed space to accommodate the battery cell assembly 20.

[0085] In some embodiments, the housing 10 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 10 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0086] refer to Figure 3 , Figure 3 This is an exploded structural diagram of a battery cell 21 provided in some embodiments of this application. A battery cell 21 refers to the smallest unit that makes up a battery. As shown, the battery cell 21 includes an end cap 212, a housing 211, an electrode assembly 213, and other functional components.

[0087] End cap 212 refers to a component that covers the opening of housing 211 to isolate the internal environment of battery cell 21 from the external environment. The shape of end cap 212 can be adapted to the shape of housing 211 to fit it. Optionally, end cap 212 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 212 is not easily deformed under pressure and impact, giving battery cell 21 higher structural strength and improved safety performance. Functional components such as electrode terminals 214 can be provided on end cap 212. Electrode terminals 214 can be used for electrical connection with electrode assembly 213 for outputting or inputting electrical energy to battery cell 21. In some embodiments, end cap 212 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 21 reaches a threshold. The material of end cap 212 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the end cap 212. The insulating element can be used to isolate the electrical connection components within the housing 211 from the end cap 212 to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.

[0088] The housing 211 is a component used to cooperate with the end cap 212 to form the internal environment of the battery cell 21. This internal environment can accommodate the electrode assembly 213, electrolyte, and other components. The housing 211 and the end cap 212 can be independent components. An opening can be provided on the housing 211, and the end cap 212 can be used to close the opening to form the internal environment of the battery cell 21. Alternatively, the end cap 212 and the housing 211 can be integrated. Specifically, the end cap 212 and the housing 211 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 211, the end cap 212 closes the housing 211. The housing 211 can have various shapes and sizes, such as cuboid, cylindrical, or hexagonal prism. Specifically, the shape of the housing 211 can be determined according to the specific shape and size of the electrode assembly 213. The shell 211 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special restrictions on this.

[0089] Electrode assembly 213 is the component in the battery cell 21 where the electrochemical reaction occurs. The casing 211 may contain one or more electrode assemblies 213. The electrode assembly 213 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body 332 of the electrode assembly 213, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body 332 or separately at both ends of the main body 332. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals 214 to form a current loop.

[0090] Firstly, reference Figure 4 , Figure 5This application provides a battery device 100 in some embodiments, including a housing 10, a battery cell assembly 20, and an adhesive structure 30. The housing 10 has a receiving space 101; the battery cell assembly 20 is received in the receiving space 101; the adhesive structure 30 includes a first adhesive layer 31, an intermediate carrier 32, and a second adhesive layer 33. The first adhesive layer 31 is connected to the battery cell assembly 20, the intermediate carrier 32 is connected to the side of the first adhesive layer 31 facing away from the battery cell assembly 20, one side of the second adhesive layer 33 is connected to the side of the housing 10 facing the receiving space 101, and the other side of the second adhesive layer 33 is connected to the side of the intermediate carrier 32 facing away from the first adhesive layer 31; the first adhesive layer 31... The adhesive layer 33 includes an adhesive liquid of a first viscosity and an adhesive liquid of a second viscosity, wherein the first viscosity is greater than the second viscosity; in the arrangement direction of the battery cell assembly 20 and the bonding structure 30, the first adhesive layer 31 is staggered from the battery cell assembly 20; or in the arrangement direction of the battery cell assembly 20 and the bonding structure 30, a portion of the first adhesive layer 31 extends to the periphery of the battery cell assembly 20, and the ratio of the size of the portion of the first adhesive layer 31 extending to the periphery of the battery cell assembly 20 to the size of the battery cell assembly 20 is less than or equal to 5%.

[0091] In the figure, the X-axis is the length direction of the battery device 100, the Y-axis is the width direction of the battery device 100, and the Z-axis is the height direction of the battery device 100.

[0092] The housing 10 refers to the structure in the battery device 100 that provides a space 101 for housing the battery cell 21 and other structures. The battery cell 21 is housed in the housing 10. The housing 10 can be prismatic, cylindrical, or other shapes. The material of the housing 10 can be metal, plastic, or other materials.

[0093] The accommodating space 101 refers to the spatial structure in the housing 10 used to accommodate the battery cell 21 and other structures. The accommodating space 101 is formed inside the housing 10. The accommodating space 101 can be a prism-shaped spatial structure, a cylindrical spatial structure, or other shapes of spatial structures. The shape of the accommodating space 101 can also be set according to the shape of the housing 10.

[0094] A battery cell assembly 20 refers to a structure composed of battery cells 21. A battery cell 21 is the smallest unit that makes up the battery device 100. The number of battery cells 21 can be one, two, or more. A battery cell assembly 20 can include one battery cell 21, or it can include two or more battery cells 21. When a battery cell assembly 20 includes two or more battery cells 21, the battery cells 21 in the battery cell assembly 20 can be connected in series, in parallel, or in a mixed configuration. The battery cells 21 in the battery cell assembly 20 can be arranged in one direction or in an array along two different directions. The battery cells 21 in the battery cell assembly 20 can be fixed and constrained by straps, plates, or other structures. The battery cells 21 in the battery cell assembly 20 can also be directly placed in the receiving space 101 of the housing 10. The number of battery cell assemblies 20 can be one, two, or more.

[0095] The adhesive structure 30 refers to the structure in the battery device 100 used to fix the battery cell assembly 20 inside the housing 10. The adhesive structure 30 can bond the battery cell assembly 20 to the wall surface of the housing 10.

[0096] The first adhesive layer 31 refers to the structure in the adhesive structure 30 used for bonding with the battery cell assembly 20. The first adhesive layer 31 is connected to the battery cell assembly 20. The shape of the first adhesive layer 31 can be circular, square or other shapes. The first adhesive layer 31 can completely cover the corresponding side of the battery cell assembly 20, or it can only cover a part of the corresponding side of the battery cell assembly 20. The material of the first adhesive layer 31 can include acrylic ester adhesive, epoxy resin adhesive, polyurethane acrylic ester adhesive or other adhesives.

[0097] The intermediate carrier 32 refers to the structure in the adhesive structure 30 used to support the first adhesive layer 31 and the second adhesive layer 33. The intermediate carrier 32 can be circular, square or other shapes. The shape of the first adhesive layer 31 can be the same as or different from the shape of the intermediate carrier 32. The material of the intermediate carrier 32 can include metal, plastic or other materials.

[0098] The battery cell assembly 20 is bonded to the intermediate carrier 32 by the first adhesive layer 31. During the installation process, the first adhesive layer 31 can be applied to the intermediate carrier 32 first, and then the battery cell assembly 20 can be placed on the first adhesive layer 31 to bond the battery cell assembly 20 to the intermediate carrier 32 through the first adhesive layer 31.

[0099] The second adhesive layer 33 refers to the structure in the adhesive structure 30 used for bonding with the housing 10. The second adhesive layer 33 is used to bond the intermediate carrier 32 to the housing 10 so as to fix the battery cell assembly 20 inside the housing 10. The shape of the second adhesive layer 33 can be circular, square or other shapes. The second adhesive layer 33 can completely cover the corresponding wall surface of the housing 10 or only cover a part of the corresponding wall surface of the housing 10. The material of the second adhesive layer 33 can include epoxy resin, polyurethane, acrylic or other adhesives.

[0100] For example, the second adhesive layer 33 can be the structural adhesive used in the current battery device 100 for directly bonding the battery cells 21.

[0101] The intermediate carrier 32 is bonded to the wall of the housing 10 through the second adhesive layer 33, thereby fixing the battery cell assembly 20 to the corresponding wall of the housing 10, thus fixing the battery cell assembly 20.

[0102] The bonding structure 30 includes a first adhesive layer 31, an intermediate carrier 32, and a second adhesive layer 33 arranged sequentially. The bottom of the battery cell assembly 20 is bonded with the first adhesive layer 31, the side of the first adhesive layer 31 facing away from the battery cell assembly 20 is bonded with the intermediate carrier 32, the side of the intermediate carrier 32 facing away from the first adhesive layer 31 is bonded with the second adhesive layer 33, and the side of the second adhesive layer 33 facing away from the intermediate carrier 32 is bonded with the housing 10, thereby bonding the battery cell assembly 20 to the housing 10.

[0103] The first adhesive layer 31 includes an adhesive liquid with a first viscosity. The adhesive liquid of the first adhesive layer 31 may include only one material or may include multiple different materials. When the adhesive liquid of the first adhesive layer 31 includes multiple different materials, the first viscosity refers to the viscosity of the adhesive liquid formed by mixing multiple different materials.

[0104] The second adhesive layer 33 includes an adhesive liquid with a second viscosity. The adhesive liquid of the second adhesive layer 33 may include only one material or may include multiple different materials. When the adhesive liquid of the second adhesive layer 33 includes multiple different materials, the second viscosity refers to the viscosity of the adhesive liquid formed by mixing multiple different materials.

[0105] The first viscosity is greater than the second viscosity. The viscosity of the adhesive reflects its flow properties before curing. The higher the viscosity of the adhesive, the worse its flow properties before curing. Therefore, the first viscosity is made greater than the second viscosity so that the flow properties of the first adhesive layer 31 are weaker than those of the second adhesive layer 33.

[0106] Because the viscosity of the first adhesive layer 31 is greater than that of the second adhesive layer 33, the first adhesive layer 31 has poorer fluidity compared to the second adhesive layer 33. During the process of placing the battery cell assembly 20 on the intermediate carrier 32 coated with the first adhesive layer 31, the first adhesive layer 31 is less likely to overflow to the side of the battery cell 21 with a larger area. After the first adhesive layer 31 is cured, it is also difficult for the first adhesive layer 31 to extend to the side of the battery cell 21 with a larger area, thereby reducing the damage that the first adhesive layer 31 may cause to the battery cell 21 after curing.

[0107] When the viscosity of the first adhesive layer 31 is greater than that of the second adhesive layer 33, the flowability of the first adhesive layer 31 is poor. In this case, the first adhesive layer 31 may not overflow to the periphery of the battery cell assembly 20 and the battery cell 21 at all. The height of the first adhesive layer 31 overflowing to the periphery of the battery cell assembly 20 and / or the battery cell 21 may be small, thereby reducing the damage that the first adhesive layer 31 may cause to the battery cell 21 after curing.

[0108] Without the first adhesive layer 31 overflowing to the periphery of the battery cell assembly 20, the first adhesive layer 31 is staggered from the battery cell assembly 20 in the arrangement direction of the battery cell assembly 20 and the adhesive structure 30. That is, the first adhesive layer 31 does not overflow to the periphery of the battery cell assembly 20, nor does it overflow to the periphery of the battery cell 21.

[0109] When the height of the first adhesive layer 31 overflowing to the periphery of the battery cell assembly 20 and / or the battery cell 21 is small, a portion of the first adhesive layer 31 can extend in the direction of the battery cell assembly 20 and the adhesive structure 30. The size of this extended portion of the first adhesive layer 31 in the direction of the battery cell assembly 20 and the adhesive structure 30 is the overflow height of the first adhesive layer 31.

[0110] The dimension of the battery cell assembly 20 in the arrangement direction of the battery cell assembly 20 and the bonding structure 30 is the dimension of the battery cell 21 in that direction. This dimension can be the height of the battery cell 21, the width of the battery cell 21, or other dimensions.

[0111] The ratio of the overflow height of the first adhesive layer 31 to the dimension of the battery cell assembly 20 in that direction is less than or equal to 5%. This ratio can be 5%, or it can be 4%, 3%, 2.5%, 2%, 1% or other values. Understandably, this ratio can also be 0, in which case the first adhesive layer 31 does not extend and overflow in the direction where the battery cell assembly 20 is located.

[0112] For example, when the battery cell assembly 20 and the adhesive structure 30 are arranged along the height direction Z of the battery device, the first adhesive layer 31 is located below the battery cell assembly 20. In this case, the first adhesive layer 31 can be offset from the battery cell assembly 20 in the height direction Z of the battery device, that is, the first adhesive layer 31 does not overflow in the direction where the battery cell assembly 20 is located. Alternatively, the first adhesive layer 31 can extend upward along the height direction Z of the battery device and overflow, and be located on the periphery of the battery cell assembly 20 and / or the battery cell 21. In this case, the ratio of the size of the portion of the first adhesive layer 31 located on the periphery of the battery cell assembly 20 and / or the battery cell 21 in the height direction Z of the battery device to the size of the battery cell assembly 20 in the height direction Z of the battery device is less than or equal to 5%.

[0113] For example, in the arrangement direction of the battery cell assembly 20 and the adhesive structure 30, the size of the battery cell assembly 20 is 110 cm, and the size of the portion of the first adhesive layer 31 extending and overflowing to the periphery of the battery cell assembly 20 and / or the battery cell 21 ranges from 0 to 5.5 cm.

[0114] For measuring the dimensions of the portion of the first adhesive layer 31 extending to the periphery of the battery cell assembly 20, the integrated structure formed by connecting the battery cell assembly 20 and the adhesive structure 30 can be removed from the housing 10, and the dimensions of the portion of the first adhesive layer 31 extending to the periphery of the battery cell assembly 20 can be measured using a ruler, vernier caliper, or other length measuring tools; other methods can also be used to measure the dimensions of the portion of the first adhesive layer 31 extending to the periphery of the battery cell assembly 20.

[0115] In this embodiment, an adhesive structure 30 is provided, comprising a first adhesive layer 31, an intermediate carrier 32, and a second adhesive layer 33. The battery cell 21 is bonded to the intermediate carrier 32 by the first adhesive layer 31, and the intermediate carrier 32 is bonded and fixed to the housing 10 by the second adhesive layer 33, thereby fixing the battery cell 21 inside the housing 10. The viscosity of the first adhesive layer 31 is greater than that of the second adhesive layer 33, so that the first adhesive layer 31 has poor flowability and is less likely to extend to the side of the battery cell 21 or the height of the first adhesive layer 31 extending to the side of the battery cell 21 is lower, thereby reducing the risk of the first adhesive layer 31 overflowing to the side of the battery cell 21 with a larger area, thereby reducing the risk of stress concentration after the first adhesive layer 31 cures.

[0116] In some embodiments, the viscosity of the first adhesive layer 31 is greater than or equal to 100,000 millipas per second (mPa·s).

[0117] The viscosity of the first adhesive layer 31 reflects the flow properties of the first adhesive layer 31 before curing. The higher the viscosity of the first adhesive layer 31, the worse its flow properties are before curing.

[0118] The viscosity of the first adhesive layer 31 is greater than or equal to 100,000 mPa·s, that is, the viscosity of the first adhesive layer 31 can be 100,000 mPa·s, 150,000 mPa·s, 200,000 mPa·s or other values.

[0119] Under this setting, the viscosity of the first adhesive layer 31 is relatively high, and the flowability of the first adhesive layer 31 is relatively poor. During the process of placing the battery cell assembly 20 on the intermediate carrier 32 coated with the first adhesive layer 31, the first adhesive layer 31 is difficult to flow and difficult to overflow to the side of the battery cell 21 with a larger area.

[0120] For example, the viscosity of the first adhesive layer 31 is 100,000 mPa·s. At this time, the first adhesive layer 31 can not only bond and fix the battery cell assembly 20 to the intermediate carrier 32, but also reduce the flow of the first adhesive layer 31 to the side of the battery cell 21 with a larger area, thereby reducing the damage that the first adhesive layer 31 may cause to the battery cell 21 after curing.

[0121] This embodiment provides some viscosity ranges for the first adhesive layer 31 to further reduce the fluidity of the first adhesive layer 31 and reduce the risk of the first adhesive layer 31 overflowing to the side of the battery cell 21 with a larger area, thereby reducing the risk of stress concentration after the first adhesive layer 31 is cured.

[0122] In some embodiments, the material of the first adhesive layer 31 includes epoxy adhesive and / or UV-curable adhesive.

[0123] Epoxy adhesives have high bonding strength and excellent mechanical properties, enabling the first adhesive layer 31 to better and more stably bond the battery cell module 20 to the intermediate carrier 32. Epoxy adhesives also have good insulation properties, thereby reducing the risk of short circuits between the battery cell module 20 and other adjacent structures. At the same time, epoxy adhesives also have excellent chemical resistance, low shrinkage, and excellent adhesion.

[0124] Epoxy adhesives also have excellent adaptability, which makes it easy to control the flowability of the first adhesive layer 31 and to adjust the adhesive properties, insulation properties and other properties of the first adhesive layer 31.

[0125] The UV-curable adhesive has excellent mechanical properties, which enables the first adhesive layer 31 to better and more stably bond the battery cell assembly 20 to the intermediate carrier 32. The UV-curable adhesive also has excellent electrical insulation properties, which can reduce the risk of short circuit between the battery cell assembly 20 and other adjacent structures. At the same time, the UV-curable adhesive also has excellent chemical resistance and fast curing speed.

[0126] The material of the first adhesive layer 31 may include epoxy adhesive or UV-curable adhesive, or both epoxy adhesive and UV-curable adhesive; for example, the material of the first adhesive layer 31 may include UV epoxy adhesive.

[0127] The technical solution of this embodiment provides some material options for the first adhesive layer 31, so that the first adhesive layer 31 includes epoxy adhesive and / or light-curing adhesive, so that the first adhesive layer 31 can not only be bonded to the battery cell 21 relatively stably, but also have low fluidity and facilitate the curing of the first adhesive layer 31.

[0128] In some embodiments, the viscosity of the second adhesive layer 33 is less than or equal to 20000 mPa·s.

[0129] The viscosity of the second adhesive layer 33 reflects the flow properties of the second adhesive layer 33 before curing. The lower the viscosity of the second adhesive layer 33, the better the flow properties of the second adhesive layer 33 before curing.

[0130] The viscosity of the second adhesive layer 33 is less than or equal to 20,000 mPa·s, that is, the viscosity of the first adhesive layer 31 can be 20,000 mPa·s, or 15,000 mPa·s, 10,000 mPa·s or other values.

[0131] Under this setting, the viscosity of the second adhesive layer 33 is relatively low, and the fluidity of the second adhesive layer 33 is relatively strong. During the process of placing the intermediate carrier 32 carrying the battery cell assembly 20 on the wall of the box 10 coated with the second adhesive layer 33, the second adhesive layer 33 can be distributed more evenly on the corresponding wall of the box 10 after being pressed. Moreover, the second adhesive layer 33 with low viscosity can have higher bonding strength with the intermediate carrier 32 and the corresponding wall of the box 10, so that the second adhesive layer 33 can better and more stably connect the intermediate carrier 32 to the box 10.

[0132] During the process of placing the intermediate carrier 32 carrying the battery cell assembly 20 onto the wall of the housing 10 coated with the second adhesive layer 33, the second adhesive layer 33 has a certain fluidity so that the second adhesive layer 33 can cover the corresponding wall of the housing 10 more evenly, thereby enabling the second adhesive layer 33 to better and more stably connect the intermediate carrier 32 to the housing 10.

[0133] For example, the viscosity of the second adhesive layer 33 is 20000 mPa·s. At this time, the second adhesive layer 33 can more stably bond the intermediate carrier 32 carrying the battery cell assembly 20 to the corresponding wall surface of the housing 10.

[0134] This embodiment provides a viscosity range for the second adhesive layer 33 to facilitate its application, enabling it to better cover the corresponding wall surface of the housing 10 and better bond the intermediate carrier 32 to the housing 10. Simultaneously, it also limits the viscosity of the first adhesive layer 31 from the side, resulting in poor flowability and reducing the risk of the first adhesive layer 31 overflowing onto the larger side surface of the battery cell 21.

[0135] In some embodiments, the material of the second adhesive layer 33 includes polyurethane structural adhesive.

[0136] Polyurethane structural adhesive has broad adhesion to a variety of materials, enabling the second adhesive layer 33 to stably bond the intermediate carrier 32 and the housing 10 with different materials; polyurethane structural adhesive also has excellent flexibility and impact resistance, enabling the second adhesive layer 33 to also play a buffering and energy absorption role, thereby providing a certain degree of protection for the battery cell module 20; polyurethane structural adhesive also has excellent low temperature resistance, excellent fatigue resistance and excellent weather resistance.

[0137] This embodiment provides some material options for the second adhesive layer 33, including polyurethane structural adhesive, so that the second adhesive layer 33 can not only better bond the intermediate carrier 32 to the housing 10, but also facilitate the coating of the second adhesive layer 33; at the same time, this setting also enables the second adhesive layer 33 to have a buffering and energy absorption effect, so as to provide a certain protection for the battery cell 21.

[0138] In some embodiments, the intermediate carrier 32 is an insulating structural component.

[0139] The intermediate carrier 32 is an insulating structural component, and the material of the intermediate carrier 32 may include plastic, ceramic, glass, mica or other materials.

[0140] Since the intermediate carrier 32 is located between the corresponding wall surfaces of the battery cell assembly 20 and the housing 10, this arrangement can reduce the risk of short circuit between the battery cell 21 and the housing 10; when the first adhesive layer 31 is also an insulating structure, setting the intermediate carrier 32 as an insulating structure can further reduce the risk of short circuit between the battery cell 21 and the housing 10.

[0141] In this embodiment, the intermediate carrier 32 is an insulating structural component to reduce the risk of short circuit between the battery cell 21 and the housing 10.

[0142] In some embodiments, the intermediate carrier 32 is made of plastic.

[0143] Plastics have excellent electrical insulation properties, as well as high strength and low density, so that the intermediate carrier 32 can have both good insulation properties and low weight.

[0144] When the intermediate carrier 32 is made of plastic, it can provide a certain support for the battery cell assembly 20 and also provide a certain insulation protection capability. At the same time, the intermediate carrier 32 can also separate the first adhesive layer 31 and the second adhesive layer 33, and the intermediate carrier 32 itself is relatively lightweight.

[0145] For example, the intermediate carrier 32 may be made of polycarbonate (PC) and / or polyethylene terephthalate (PCT).

[0146] For example, the intermediate carrier 32 is a rectangular thin film structure with a thickness of 0.2 mm. The edges of the intermediate carrier 32 are rounded with a radius of 1.5 mm. The breakdown voltage of the intermediate carrier 32 is 25 kV / mm.

[0147] This embodiment provides some specific materials for the intermediate carrier 32, which enable the first adhesive layer 31 and the second adhesive layer 33 to adhere well to the intermediate carrier 32, and also enable the intermediate carrier 32 to have good insulation properties and light weight.

[0148] refer to Figure 5 In some embodiments, the second adhesive layer 33 includes at least two spaced adhesives 331, each adhesive 331 being connected to the housing 10 and the intermediate carrier 32.

[0149] Colloid 331 refers to the adhesive structure that makes up the second adhesive layer 33. Colloid 331 can be a strip-shaped structure, or a cylindrical, prismatic or other irregular block-shaped structure. There can be two, three or more colloids 331, and each colloid 331 together makes up the second adhesive layer 33. At least two colloids 331 are spaced apart. At least two colloids 331 can be spaced apart along the length direction X of the battery device 100, or along the width direction Y of the battery device 100 or other directions.

[0150] For example, the colloid 331 is a long strip structure, and the length direction of the colloid 331 is parallel to the width direction Y of the battery device 100. The colloids 331 are arranged at intervals along the length direction X of the battery device 100.

[0151] For example, during the formation of the second adhesive layer 33, a corresponding number of strip adhesives can be applied to the wall surface of the box 10 to form adhesive 331. After all the adhesives 331 have been applied, all the adhesives 331 together serve as the second adhesive layer 33.

[0152] Each colloid 331 is connected to the housing 10 and the intermediate carrier 32, that is, each colloid 331 is used to connect the intermediate carrier 32 carrying the battery cell assembly 20 to the corresponding wall of the housing 10.

[0153] With this configuration, the area of ​​the box 10 wall covered by the second adhesive layer 33 is relatively smaller, and the amount of adhesive required for the second adhesive layer 33 is less, thereby reducing the processing cost of the second adhesive layer 33.

[0154] When the second adhesive layer 33 can stably bond the intermediate carrier 32 carrying the battery cell assembly 20 to the housing 10, this arrangement can reduce the amount of adhesive used in the second adhesive layer 33; at the same time, the space between adjacent adhesive layers 331 can also serve as a buffer and energy-absorbing space to absorb the impact energy from the corresponding side wall of the housing 10, thereby better protecting the battery cell 21.

[0155] In this embodiment, the second adhesive layer 33 includes at least two spaced adhesive particles 331. While the second adhesive layer 33 can provide stable bonding performance, the coverage area of ​​the second adhesive layer 33 is reduced, the amount of adhesive used in the second adhesive layer 33 is reduced, and the cost is lowered.

[0156] In some embodiments, the ratio of the area of ​​the second adhesive layer 33 projected onto the corresponding wall of the housing 10 to the area of ​​the corresponding wall of the housing 10 ranges from 40% to 60%.

[0157] The projected area of ​​the second adhesive layer 33 on the wall of the corresponding box 10 reflects the coverage area of ​​the second adhesive layer 33 on the wall of the corresponding box 10; the ratio of the coverage area of ​​the second adhesive layer 33 to the area of ​​the wall of the corresponding box 10 is in the range of 40% to 60%, and the ratio can be 40%, 45%, 50%, 55%, 60% or other values.

[0158] The larger the coverage area of ​​the second adhesive layer 33 on the corresponding wall of the box 10, the larger the connection area between the second adhesive layer 33 and the intermediate carrier 32 and the wall of the box 10, the better the bonding effect of the second adhesive layer 33, but the corresponding amount of adhesive used is also larger.

[0159] The ratio of the coverage area of ​​the second adhesive layer 33 to the wall area of ​​the corresponding housing 10 is in the range of 40% to 60%, so that the second adhesive layer 33 can not only stably bond the intermediate carrier 32 carrying the battery cell assembly 20 to the housing 10, but also reduce the amount of adhesive used in the second adhesive layer 33.

[0160] For example, the ratio of the coverage area of ​​the second adhesive layer 33 to the wall area of ​​the corresponding housing 10 is 60%. Under this setting, the coverage area of ​​the second adhesive layer 33 on the wall of the corresponding housing 10 is relatively large, and the second adhesive layer 33 can better bond the intermediate carrier 32 carrying the battery cell assembly 20 to the housing 10.

[0161] For example, the ratio of the coverage area of ​​the second adhesive layer 33 to the wall area of ​​the corresponding housing 10 is 50%. Under this setting, the coverage area of ​​the second adhesive layer 33 on the wall of the corresponding housing 10 is moderate. The second adhesive layer 33 can not only bond the intermediate carrier 32 carrying the battery cell assembly 20 to the housing 10, but also reduce the amount of adhesive used in the second adhesive layer 33, and can form a space between adjacent adhesive layers 331 to absorb collision energy.

[0162] For example, the ratio of the coverage area of ​​the second adhesive layer 33 to the wall area of ​​the corresponding housing 10 is 40%. Under this setting, the coverage area of ​​the second adhesive layer 33 on the wall of the corresponding housing 10 is relatively small. In the case that the second adhesive layer 33 can bond the intermediate carrier 32 carrying the battery cell assembly 20 to the housing 10, this setting can further reduce the amount of adhesive used in the second adhesive layer 33 and can form more space between adjacent adhesive layers 331 to absorb collision energy.

[0163] This embodiment further provides a range of coverage area ratios for the second adhesive layer 33, which, while providing stable bonding performance, better reduces the amount of adhesive used in the second adhesive layer 33 and lowers costs.

[0164] refer to Figure 4 , Figure 5 In some embodiments, the thickness of the first adhesive layer 31 is less than the thickness of the second adhesive layer 33.

[0165] The thickness of the first adhesive layer 31 and the second adhesive layer 33 refers to the dimensions of the first adhesive layer 31 and the second adhesive layer 33 in the arrangement direction of the first adhesive layer 31, the intermediate carrier 32 and the second adhesive layer 33; the thickness of the first adhesive layer 31 and the second adhesive layer 33 also refers to the dimensions of the first adhesive layer 31 and the second adhesive layer 33 after curing.

[0166] The thickness of the first adhesive layer 31 is less than the thickness of the second adhesive layer 33, so that the thickness of the first adhesive layer 31 is smaller. Since the first adhesive layer 31 is mainly used to bond the battery cell assembly 20 to the intermediate carrier 32, the thickness of the first adhesive layer 31 does not need to be large. At the same time, making the thickness of the first adhesive layer 31 smaller can also reduce the situation where the first adhesive layer 31 overflows to the side of the battery cell 21 with a larger area, thereby reducing the risk of damage to the battery cell 21.

[0167] The thickness of the second adhesive layer 33 is greater than that of the first adhesive layer 31, so that the second adhesive layer 33 is thicker. With this setting, the second adhesive layer 33 can not only stably bond the intermediate carrier 32 carrying the battery cell assembly 20 to the housing 10, but the thicker second adhesive layer 33 can also better absorb and buffer the impact energy of collision, so as to better protect the battery cell 21.

[0168] In this embodiment, the thickness of the first adhesive layer 31 is relatively thin. With the first adhesive layer 31 able to bond and fix the battery cell assembly 20 to the intermediate carrier 32, this arrangement can further reduce the risk of the first adhesive layer 31 overflowing to the side of the adjacent battery cell 21 with a larger area; this arrangement can also reduce the space occupied by the first adhesive layer 31.

[0169] In this embodiment, the second adhesive layer 33 is made thicker so that it can not only stably bond the intermediate carrier 32 carrying the battery cell assembly 20 to the housing 10, but also absorb and buffer the impact energy to protect the battery cell 21.

[0170] In some embodiments, the thickness of the first adhesive layer 31 ranges from 0.5 mm to 1 mm.

[0171] The thickness of the first adhesive layer 31 reflects the risk of the first adhesive layer 31 overflowing to the larger side of the battery cell 21 before curing. The greater the thickness of the first adhesive layer 31, the higher the risk of the first adhesive layer 31 overflowing to the larger side of the battery cell 21 before curing.

[0172] Accordingly, the thickness of the first adhesive layer 31 is in the range of 0.5mm to 1mm; for example, the thickness of the first adhesive layer 31 can be 0.5mm, 0.6mm, 0.7mm, 0.75mm, 0.8mm, 0.9mm, 1mm or other values.

[0173] The thickness of the first adhesive layer 31 is in the range of 0.5mm to 1mm, so that the first adhesive layer 31 can not only stably bond the battery cell assembly 20 to the intermediate carrier 32, but also reduce the risk of the first adhesive layer 31 overflowing to the larger side of the battery cell 21 before curing.

[0174] For example, the thickness of the first adhesive layer 31 is 0.5 mm. With this setting, the thickness of the first adhesive layer 31 is relatively thin. When the first adhesive layer 31 can bond the battery cell assembly 20 to the intermediate carrier 32, this setting can better reduce the risk of the first adhesive layer 31 overflowing to the larger side of the battery cell 21 before curing.

[0175] For example, the thickness of the first adhesive layer 31 is 0.75 mm. With this setting, the thickness of the first adhesive layer 31 is moderate. The first adhesive layer 31 can not only bond the battery cell assembly 20 to the intermediate carrier 32, but also reduce the risk of the first adhesive layer 31 overflowing to the larger side of the battery cell 21 before curing.

[0176] For example, the thickness of the first adhesive layer 31 is 1 mm. With this setting, the thickness of the first adhesive layer 31 is relatively thick, and the first adhesive layer 31 can better bond the battery cell assembly 20 to the intermediate carrier 32.

[0177] This embodiment provides a range of thicknesses for the first adhesive layer 31, so that the first adhesive layer 31 can be stably bonded and fixed to the intermediate carrier 32, and the risk of the first adhesive layer 31 overflowing to the larger side of the adjacent battery cell 21 can be reduced.

[0178] In some embodiments, the thickness of the second adhesive layer 33 ranges from 2 mm to 2.5 mm.

[0179] The thickness of the second adhesive layer 33 reflects the bonding stability of the second adhesive layer 33 to the intermediate carrier 32 that carries the battery cell assembly 20. The greater the thickness of the second adhesive layer 33, the higher the bonding stability of the second adhesive layer 33 and the better the buffering and energy absorption effect of the second adhesive layer 33. However, the second adhesive layer 33 also occupies more space and has a higher cost.

[0180] Accordingly, the thickness of the second adhesive layer 33 is in the range of 2mm to 2.5mm; for example, the thickness of the first adhesive layer 31 can be 2mm, 2.1mm, 2.2mm, 2.25mm, 2.3mm, 2.4mm, 2.5mm or other values.

[0181] The thickness of the second adhesive layer 33 is in the range of 2mm to 2.5mm, so that the second adhesive layer 33 can not only stably bond the intermediate carrier 32 carrying the battery cell assembly 20 to the housing 10, but also have the function of buffering and absorbing energy, while also reducing the space occupied by the second adhesive layer 33 and reducing costs.

[0182] For example, the thickness of the second adhesive layer 33 is 2mm. With this setting, the thickness of the second adhesive layer 33 is relatively thin. When the second adhesive layer 33 can bond the intermediate carrier 32 carrying the battery cell assembly 20 to the housing 10, this setting can better reduce the space occupied by the second adhesive layer 33 and reduce the cost of the second adhesive layer 33.

[0183] For example, the thickness of the second adhesive layer 33 is 2.25 mm. With this setting, the thickness of the second adhesive layer 33 is moderate. The second adhesive layer 33 can not only bond the intermediate carrier 32 carrying the battery cell assembly 20 to the housing 10, but also reduce the space occupied by the second adhesive layer 33.

[0184] For example, the thickness of the second adhesive layer 33 is 2.5mm. With this setting, the thickness of the second adhesive layer 33 is relatively large, which allows the second adhesive layer 33 to better bond the intermediate carrier 32 carrying the battery cell assembly 20 to the housing 10. At the same time, it also has good buffering and energy absorption performance, so as to better protect the battery cell 21.

[0185] This embodiment provides a range of thicknesses for the second adhesive layer 33, so that the second adhesive layer 33 can better and more stably bond and fix the intermediate carrier 32 to the housing 10; at the same time, making the second adhesive layer 33 thicker also enables the second adhesive layer 33 to play a certain role in buffering and absorbing energy, thereby providing protection for the bottom of the battery cell assembly 20.

[0186] refer to Figure 4 , Figure 5 In some embodiments, the second adhesive layer 33 includes a main body 332 and a fixing part 333 connected to the main body 332. The main body 332 is located between the intermediate carrier 32 and the wall of the corresponding box 10. One end of the fixing part 333 is connected to the main body 332, and the other end of the fixing part 333 extends along the arrangement direction of the first adhesive layer 31 and the second adhesive layer 33 and is at least connected to the periphery of the intermediate carrier 32.

[0187] The main body 332 refers to the portion of the second adhesive layer 33 located between the intermediate carrier 32 and the wall of the housing 10 along the arrangement direction of the first adhesive layer 31 and the intermediate carrier 32. The main body 332 is mainly used to bond the intermediate carrier 32 to the corresponding wall of the housing 10. When the first adhesive layer 31 and the intermediate carrier 32 are arranged along the height direction Z of the battery device 100, the main body 332 is the portion of the second adhesive layer 33 located between the intermediate carrier 32 and the corresponding wall of the housing 10 along the height direction Z of the battery device 100. The shape of the main body 332 can be circular, square, or other shapes. When the second adhesive layer 33 includes multiple adhesives 331, the main body 332 refers to the portion of each adhesive 331 located between the intermediate carrier 32 and the wall of the housing 10 along the arrangement direction of the first adhesive layer 31 and the intermediate carrier 32.

[0188] The fixing part 333 refers to the part of the second adhesive layer 33 located around the intermediate carrier 32. One end of the fixing part 333 is connected to the main body part 332. The fixing part 333 can be integrally formed with the main body part 332, or the fixing part 333 can be separately formed and bonded to the main body part 332. The fixing part 333 can be a columnar structure provided around the intermediate carrier 32, or it can be a ring-shaped structure surrounding the intermediate carrier 32.

[0189] The fixing part 333 extends along the arrangement direction of the first adhesive layer 31 and the intermediate carrier 32, so that the fixing part 333 can be connected to at least the periphery of the intermediate carrier 32. Depending on the length of the extension of the fixing part 333, the fixing part 333 can be connected only to the periphery of the intermediate carrier 32, or it can be connected to the first adhesive layer 31, or it can be further connected to the battery cell assembly 20. In this case, the fixing part 333 connects the intermediate carrier 32, the first adhesive layer 31 and the battery cell assembly 20 into one unit to improve the connection stability between the various structures.

[0190] For example, after a temporary adhesive layer with a certain fluidity is formed on the corresponding wall surface of the housing 10, the intermediate carrier 32 carrying the battery cell assembly 20 is placed on the temporary adhesive layer. At this time, the edge of the temporary adhesive layer will overflow under the gravity of the intermediate carrier 32 and flow along the arrangement direction of the first adhesive layer 31 and the intermediate carrier 32. This part of the adhesive can form the fixing part 333 after curing.

[0191] This embodiment provides a specific structure for the second adhesive layer 33, which includes a main body 332 and a fixing part 333. The fixing part 333 extends along the arrangement direction of the first adhesive layer 31 and the second adhesive layer 33, so that the fixing part 333 can be connected to at least the periphery of the intermediate carrier 32, thereby increasing the connection area between the second adhesive layer 33 and the intermediate carrier 32 and improving the connection stability between the second adhesive layer 33 and the intermediate carrier 32.

[0192] refer to Figure 4 , Figure 5 In some embodiments, the fixing part 333 is connected to the intermediate carrier 32 and the first adhesive layer 31; or the fixing part 333 is connected to the intermediate carrier 32, the first adhesive layer 31 and the battery cell assembly 20.

[0193] When the fixing part 333 is connected to the intermediate carrier 32, the fixing part 333 can also be connected to the first adhesive layer 31. In this case, the fixing part 333 can directly bond the first adhesive layer 31, the intermediate carrier 32 and the second adhesive layer 33 into one piece, so as to improve the integrity of the adhesive structure 30 and improve the bonding strength and stability between the first adhesive layer 31 and the intermediate carrier 32, and between the second adhesive layer 33 and the intermediate carrier 32.

[0194] When the fixing part 333 is connected to the intermediate carrier 32, the fixing part 333 can also be connected to the first adhesive layer 31 and the battery cell assembly 20. In this case, the fixing part 333 can directly bond the first adhesive layer 31, the intermediate carrier 32, the second adhesive layer 33 and the battery cell assembly 20 into one piece, so as to improve the bonding strength and stability between the first adhesive layer 31 and the intermediate carrier 32, the second adhesive layer 33 and the intermediate carrier 32, and the first adhesive layer 31 and the battery cell assembly 20.

[0195] Understandably, since the fixing part 333 is located on the periphery of the adhesive structure 30, even if the fixing part 333 extends to the vicinity of the battery cell assembly 20, it should still be located on the periphery of the battery cell assembly 20, and it is difficult for it to overflow into the side of the adjacent battery cell 21 with a larger area in the battery cell assembly 20. In other words, the fixing part 333 has a low risk of causing damage to the battery cell assembly 20.

[0196] In this embodiment, the fixing part 333 can also be connected to the first adhesive layer 31 and / or the battery cell assembly 20, so that the second adhesive layer 33, the intermediate carrier 32, the first adhesive layer 31 and the battery cell assembly 20 can be connected through the fixing part 333, thereby improving the integrity of the adhesive structure 30 and the connection stability between the adhesive structure 30 and the battery cell assembly 20.

[0197] refer to Figure 4 , Figure 5 In some embodiments, the orthographic projection of the intermediate carrier 32 onto the corresponding wall of the housing 10 covers the orthographic projection of the first adhesive layer 31 onto the corresponding wall of the housing 10; and / or the orthographic projection of the second adhesive layer 33 onto the corresponding wall of the housing 10 covers the orthographic projection of the intermediate carrier 32 onto the corresponding wall of the housing 10.

[0198] The orthographic projection of the intermediate carrier 32 onto the corresponding wall of the housing 10 reflects the area of ​​the intermediate carrier 32 in the direction perpendicular to the arrangement of the first adhesive layer 31 and the intermediate carrier 32; the orthographic projection of the first adhesive layer 31 onto the corresponding wall of the housing 10 reflects the area of ​​the first adhesive layer 31 in the direction perpendicular to the arrangement of the first adhesive layer 31 and the intermediate carrier 32.

[0199] The orthographic projection of the intermediate carrier 32 covers the orthographic projection of the first adhesive layer 31, that is, the area of ​​the intermediate carrier 32 is greater than or equal to the area of ​​the first adhesive layer 31; when the first adhesive layer 31 can bond the battery cell assembly 20 to the intermediate carrier 32, this arrangement makes it difficult for the first adhesive layer 31 to overflow to the second adhesive layer 33 across the intermediate carrier 32.

[0200] For example, the projected area of ​​the first adhesive layer 31 is 95% to 98% of the projected area of ​​the intermediate carrier 32, so as to form a vacant area with a width of 0.5 to 1 mm on the peripheral edge of the intermediate carrier 32, so that the fixing part 333 can extend to the vacant area and connect with the intermediate carrier 32.

[0201] The orthographic projection of the second adhesive layer 33 onto the corresponding wall of the housing 10 reflects the area of ​​the second adhesive layer 33 in the direction perpendicular to the arrangement of the first adhesive layer 31 and the intermediate carrier 32; when the second adhesive layer 33 includes multiple colloids 331, the orthographic projection of the second adhesive layer 33 is the projection enclosed by the edge contour of the overall structure formed by each colloid 331.

[0202] The orthographic projection of the second adhesive layer 33 covers the orthographic projection of the intermediate carrier 32, that is, the area of ​​the second adhesive layer 33 is greater than or equal to the area of ​​the intermediate carrier 32, so as to better bond the intermediate carrier 32 carrying the battery cell assembly 20 to the corresponding wall surface of the housing 10; when the area of ​​the second adhesive layer 33 is greater than the area of ​​the intermediate carrier 32, the edge of the second adhesive layer 33 can also form a fixing part 333 to better bond the intermediate carrier 32.

[0203] When the area of ​​the second adhesive layer 33 is greater than the area of ​​the intermediate carrier 32 and the area of ​​the intermediate carrier 32 is greater than the area of ​​the first adhesive layer 31, the edge of the second adhesive layer 33 can also form a fixing part 333 and bond the intermediate carrier 32 and the first adhesive layer 31.

[0204] This embodiment provides an area relationship between the first adhesive layer 31, the intermediate carrier 32, and the second adhesive layer 33, such that the area of ​​the first adhesive layer 31 is smaller than the area of ​​the intermediate carrier 32, and the area of ​​the intermediate carrier 32 is smaller than the area of ​​the second adhesive layer 33, so that the edge of the second adhesive layer 33 can overflow and form a fixing part 333, thereby facilitating the connection between the second adhesive layer 33 and the intermediate carrier 32 and the first adhesive layer 31.

[0205] refer to Figure 4 , Figure 5 In some embodiments, the orthographic projection of the battery cell assembly 20 onto the corresponding wall of the housing 10 covers the orthographic projection of the first adhesive layer 31 onto the corresponding wall of the housing 10.

[0206] The orthographic projection of the battery cell assembly 20 onto the corresponding wall of the housing 10 reflects the area of ​​the battery cell assembly 20 in the direction perpendicular to the arrangement of the first adhesive layer 31 and the intermediate carrier 32; the orthographic projection of the battery cell assembly 20 covers the orthographic projection of the first adhesive layer 31, that is, the orthographic projection area of ​​the battery cell assembly 20 is greater than or equal to the area of ​​the first adhesive layer 31, so as to reduce the space occupied by the first adhesive layer 31 in the circumferential direction of the battery cell assembly 20.

[0207] When the projected area of ​​the battery cell assembly 20 is greater than the area of ​​the first adhesive layer 31, the projected area of ​​the battery cell assembly 20 can be greater than or less than the area of ​​the intermediate carrier 32; when the projected area of ​​the battery cell assembly 20 is greater than the area of ​​the first adhesive layer 31, the projected area of ​​the battery cell assembly 20 can be greater than or less than the area of ​​the second adhesive layer 33.

[0208] For example, the area of ​​the second adhesive layer 33 is larger than the area of ​​the intermediate carrier 32. At this time, the edge of the second adhesive layer 33 can form a fixing part 333 and extend in the direction of the battery cell assembly 20. The fixing part 333 can be bonded to the battery cell assembly 20 so as to better bond the battery cell assembly 20, the first adhesive layer 31 and the intermediate carrier 32 into one, and can better improve the connection strength and connection stability between the battery cell assembly 20 and the bonding structure 30.

[0209] For example, the area of ​​the first adhesive layer 31 is smaller than the area of ​​the intermediate carrier 32, the area of ​​the intermediate carrier 32 is smaller than the projected area of ​​the battery cell assembly 20, and the projected area of ​​the battery cell assembly 20 is smaller than the area of ​​the second adhesive layer 33.

[0210] In this embodiment, the projected area of ​​the battery cell assembly 20 is greater than or equal to the projected area of ​​the first adhesive layer 31, so as to reduce the obstruction of the first adhesive layer 31 to the extension of the fixing part 333 to the battery cell assembly 20, so that the fixing part 333 can also be connected to the battery cell assembly 20, thereby improving the connection stability between the battery cell assembly 20 and the adhesive structure 30.

[0211] refer to Figure 4 , Figure 5 In some embodiments, the housing 10 includes a top cover 11, a frame structure 12, and a bottom plate 13. The accommodating space 101 extends through the frame structure 12 along a first direction, and the top cover 11 and the bottom plate 13 are respectively connected to the two ends of the frame structure 12 along the first direction. The adhesive structure 30 is connected to the bottom plate 13, and the fixing part 333 is also connected to the frame structure 12.

[0212] The frame structure 12 refers to the structure in the housing 10 used to provide side protection for the battery cell assembly 20. The frame structure 12 may include multiple side beams connected end to end. The frame structure 12 can be a quadrilateral square frame structure, or a pentagonal, hexagonal or other shaped frame structure. The beams in the frame structure 12 can be box beams, or I-beams or other shaped beam structures. The material of the frame structure 12 may include plastic or other materials.

[0213] The accommodating space 101 extends through the border structure 12 along the first direction. The accommodating space 101 can be a prism-shaped space structure, a cylindrical space structure, or a space structure of other shapes. The shape of the accommodating space 101 can also be set according to the shape of the border structure 12. The accommodating space 101 extends through the border structure 12, that is, the border structure 12 can be a ring structure that surrounds the accommodating space 101.

[0214] The first direction can be the height direction Z of the battery device 100, or it can be other directions; for example, the first direction is the height direction Z of the battery device 100.

[0215] The base plate 13 refers to the structure in the housing 10 used to support the battery cell assembly 20 or other structures. The base plate 13 can be a circular plate structure, a square plate structure, or a plate structure of other shapes. The base plate 13 is connected to the frame structure 12. The base plate 13 can be connected to the frame structure 12 by welding, bonding, screwing, or other methods. The base plate 13 can also be integrally formed with the frame structure 12. The material of the base plate 13 can include metal, plastic, or other materials. The material of the base plate 13 can be the same as or different from the material of the frame structure 12.

[0216] The top cover 11 refers to the structure in the housing 10 used to enclose the storage space 101. The top cover 11 can be a circular plate structure, a square plate structure, or a plate structure of other shapes. The top cover 11 can also be a box-shaped structure or a structure of other shapes with one end open. The top cover 11 is connected to the frame structure 12. The top cover 11 can be connected to the frame structure 12 by welding, bonding, screwing, or other methods. The top cover 11 can also be integrally formed with the frame structure 12. The material of the top cover 11 can include metal, plastic, or other materials. The material of the top cover 11 can be the same as or different from the material of the frame structure 12.

[0217] The bottom plate 13 and the top cover 11 are respectively connected to both sides of the frame structure 12 along the first direction. At this time, the bottom plate 13 and the top cover 11 can close the accommodating space 101 so that the accommodating space 101 becomes a closed spatial structure. When the box 10 includes a first box 10 and a second box 10, the bottom plate 13 can be connected to the frame structure 12 and serve as the first box 10, and the top cover 11 can serve as the second box 10. When the battery device 100 is installed on the vehicle 1000, the top cover 11 can also serve as the floor structure of the vehicle 1000.

[0218] The adhesive structure 30 is connected to the base plate 13. At this time, the adhesive structure 30 can also bond the battery cell assembly 20 to the base plate 13. When the adhesive structure 30 is connected to the base plate 13, the second adhesive layer 33 is connected to the base plate 13, the intermediate carrier 32 is connected to the side of the second adhesive layer 33 away from the base plate 13, the first adhesive layer 31 is connected to the side of the intermediate carrier 32 away from the second adhesive layer 33, and the battery cell assembly 20 is connected to the side of the first adhesive layer 31 away from the intermediate carrier 32. At this time, the arrangement direction of the first adhesive layer 31, the intermediate carrier 32 and the second adhesive layer 33 can be the first direction.

[0219] When the adhesive structure 30 is connected to the base plate 13, the main body 332 of the second adhesive layer 33 is also connected to the base plate 13. At this time, the fixing part 333 can be connected to the frame structure 12 while being connected to the intermediate carrier 32, so that the second adhesive layer 33 can better connect the intermediate carrier 32 to the box 10.

[0220] For example, the fixing part 333 is connected to the intermediate carrier 32, the first adhesive layer 31, the battery cell assembly 20 and the frame structure 12, and the main body part 332 is connected to the base plate 13 to connect the housing 10, the adhesive structure 30 and the battery cell assembly 20 into a whole.

[0221] In this embodiment, the adhesive structure 30 is connected to the base plate 13, that is, the second adhesive layer 33 is connected to the base plate 13, and the fixing part 333 is also connected to the frame structure 12, so as to further increase the bonding area between the adhesive structure 30 and the housing 10, thereby further improving the connection stability between the battery cell assembly 20, the adhesive structure 30 and the housing 10.

[0222] In some embodiments, the battery device 100 includes a housing 10, a battery cell assembly 20, and an adhesive structure 30.

[0223] The housing 10 includes a frame structure 12, a bottom plate 13, and a top cover 11. The frame structure 12 has a receiving space 101 that extends through the height direction Z of the battery device 100. The bottom plate 13 and the top cover 11 are respectively connected to the lower and upper sides of the frame structure 12 along the height direction Z of the battery device 100 to form a closed receiving space 101.

[0224] The battery cell assembly 20 includes a plurality of battery cells 21, which are arranged in an array along the length direction X and the width direction Y of the battery device 100.

[0225] The bonding structure 30 includes a first adhesive layer 31, an intermediate carrier 32, and a second adhesive layer 33 arranged sequentially along the height direction Z of the battery device 100; wherein, the second adhesive layer 33 is bonded to the base plate 13, the intermediate carrier 32 is connected to the side of the second adhesive layer 33 away from the base plate 13, the first adhesive layer 31 is bonded to the side of the intermediate carrier 32 away from the second adhesive layer 33, and the battery cell assembly 20 is connected to the side of the first adhesive layer 31 away from the intermediate carrier 32.

[0226] The second adhesive layer 33 includes a main body 332 and a fixing part 333. The main body 332 is bonded to the base plate 13, and the fixing part 333 is connected to the periphery of the main body 332. The fixing part 333 extends along the height direction Z of the battery device 100 and is connected to the intermediate carrier 32, the first adhesive layer 31 and the battery cell assembly 20. The fixing part 333 is also connected to the frame structure 12.

[0227] Secondly, refer to Figure 6 Some embodiments of this application also provide a method for processing a battery device 100, for processing the battery device 100 provided in some embodiments of the first aspect.

[0228] The processing method includes: S420: A first adhesive layer 31 is formed on the intermediate carrier 32.

[0229] In this step, the intermediate carrier 32 refers to the structure used to support the first adhesive layer 31 and the second adhesive layer 33. The intermediate carrier 32 can be circular, square or other shapes; the material of the intermediate carrier 32 can be metal, plastic or other materials.

[0230] The first adhesive layer 31 refers to the structure used for bonding with the battery cell assembly 20. The first adhesive layer 31 is used to bond the battery cell assembly 20 to the intermediate carrier 32. The shape of the first adhesive layer 31 can be circular, square or other shapes. The first adhesive layer 31 can completely cover the corresponding side of the intermediate carrier 32 or only cover a part of the corresponding side of the intermediate carrier 32. The material of the first adhesive layer 31 can include acrylic ester adhesive, epoxy resin adhesive, polyurethane acrylic ester adhesive or other adhesives.

[0231] In this step, the first adhesive layer 31 formed on the intermediate carrier 32 can be formed by applying liquid adhesive to the intermediate carrier 32, or by directly bonding solid adhesive to the intermediate carrier 32. If liquid adhesive is applied to the intermediate carrier 32, it can gradually cure at room temperature in the processing environment during subsequent processes, or it can be cured by other methods. For example, liquid adhesive is applied to the corresponding wall surface of the housing 10.

[0232] In this step, a first adhesive layer 31 is formed on the intermediate carrier 32, which facilitates the bonding of the battery cell assembly 20 to the intermediate carrier 32 in subsequent steps.

[0233] In this step, the first adhesive layer 31 can completely cover the corresponding side of the intermediate carrier 32, or it can only cover a part of the corresponding side of the intermediate carrier 32.

[0234] S430: The battery cell assembly 20 is bonded to the first adhesive layer 31 to obtain the intermediate module.

[0235] In this step, the intermediate module refers to the structure formed by bonding the battery cell assembly 20 to the intermediate carrier 32 through the first adhesive layer 31. The intermediate module is a temporary structure generated during the processing method.

[0236] In this step, the battery cell assembly 20 is bonded to the first adhesive layer 31 and then bonded to the intermediate carrier 32 through the first adhesive layer 31, so that the battery cell assembly 20, the first adhesive layer 31 and the intermediate module are connected.

[0237] In this step, after the battery cell assembly 20 is placed on the first adhesive layer 31, pressure can be applied to the battery cell assembly 20 so that the battery cell assembly 20 can be better bonded to the intermediate carrier 32 through the first adhesive layer 31. It can be understood that the applied pressure is mainly used to reduce the empty space between the battery cell assembly 20 and the first adhesive layer 31 so that the first adhesive layer 31 can better contact and bond with the battery cell assembly 20, without having the battery cell assembly 20 pass through the first adhesive layer 31 and directly contact the intermediate carrier 32.

[0238] In this step, when liquid adhesive is applied to the intermediate carrier 32, after the battery cell assembly 20 is bonded to the intermediate carrier 32 through the first adhesive layer 31 to form an intermediate module, the first adhesive layer 31 can gradually cure and gradually increase the bonding strength in subsequent processes until the first adhesive layer 31 is completely cured.

[0239] In this step, if a solid adhesive is applied to the intermediate carrier 32, the first adhesive layer 31 does not need to be cured.

[0240] Because the internal space of the housing 10 is relatively narrow, this step is set before the battery cell assembly 20 enters the housing 10, so as to reduce the interference of the wall of the housing 10 coating the first adhesive layer 31 and the battery cell assembly 20 and the intermediate carrier 32 being connected through the first adhesive layer 31, which makes it easier to reduce the production difficulty and improve the production efficiency.

[0241] S450: A second adhesive layer 33 is formed on the wall surface of the housing 10.

[0242] In this step, the second adhesive layer 33 refers to the structure used for bonding with the housing 10. The second adhesive layer 33 is used to bond the intermediate carrier 32 to the housing 10 so as to fix the battery cell assembly 20 inside the housing 10. The shape of the second adhesive layer 33 can be circular, square or other shapes. The second adhesive layer 33 can completely cover the corresponding wall surface of the housing 10 or only cover a part of the corresponding wall surface of the housing 10. The material of the second adhesive layer 33 can include epoxy resin, polyurethane, acrylic or other adhesives.

[0243] In this step, a second adhesive layer 33 is formed on one side of the corresponding wall of the housing 10, so as to facilitate the bonding of the intermediate module to the corresponding wall of the housing 10 in subsequent steps.

[0244] In this step, liquid adhesive can be applied to the corresponding wall surface of the housing 10 to form a second adhesive layer 33, which facilitates the bonding of the intermediate modules in subsequent steps; alternatively, solid adhesive can be applied to the corresponding wall surface of the housing 10. For example, liquid adhesive is applied to the corresponding wall surface of the housing 10.

[0245] In this step, the second adhesive layer 33 can completely cover the corresponding wall surface of the box 10, or it can only cover a part of the corresponding wall surface of the box 10.

[0246] S460: The intermediate module is placed inside the housing 10 and bonded to the second adhesive layer 33, wherein the side of the intermediate carrier 32 facing away from the first adhesive layer 31 is bonded to the second adhesive layer 33.

[0247] In this step, the side of the intermediate carrier 32 facing away from the first adhesive layer 31 is bonded to the second adhesive layer 33, and the intermediate carrier 32 is connected to the corresponding wall of the housing 10 through the second adhesive layer 33; the battery cell assembly 20 is connected to the corresponding wall of the housing 10 through the first adhesive layer 31, the intermediate carrier 32 and the second adhesive layer 33.

[0248] In this step, after the intermediate module is placed on the second adhesive layer 33, pressure can be applied to the intermediate module so that the intermediate carrier 32 can be better bonded to the corresponding wall of the housing 10 through the second adhesive layer 33. It can be understood that the applied pressure is mainly used to reduce the empty space between the intermediate carrier 32 and the second adhesive layer 33 so that the second adhesive layer 33 can better contact and bond with the battery cell assembly 20, without having the intermediate carrier 32 pass through the second adhesive layer 33 and directly contact the corresponding wall of the housing 10.

[0249] In this step, when liquid adhesive is applied to the corresponding wall surface of the housing 10, the intermediate module is bonded to the corresponding wall surface of the housing 10 through the second adhesive layer 33. The second adhesive layer 33 can gradually cure and gradually increase the bonding strength in subsequent processes until the second adhesive layer 33 is completely cured.

[0250] In this step, if a solid adhesive is applied to the corresponding wall surface of the housing 10, the second adhesive layer 33 does not need to be cured.

[0251] Understandably, the housing 10 in the above steps can be a housing 10 with an opening at one end to facilitate the application of adhesive. That is, the above steps correspond to the process before sealing the housing 10, and also to the packaging step of the battery cell assembly 20. For example, when the housing 10 includes a top cover 11, a frame structure 12, and a bottom plate 13, the housing 10 can be a structure with the bottom plate 13 connected to the frame structure 12 to form an opening at one end, and the top cover 11 can be installed after the battery cell assembly 20 is installed inside the housing 10.

[0252] In this embodiment, the battery cell assembly 20 is first bonded to the intermediate carrier 32 by the first adhesive layer 31, so as to facilitate the coating of the first adhesive layer 31 and the bonding of the battery cell assembly 20, and can reduce the interference of the housing 10 on the coating of the first adhesive layer 31 and the battery cell assembly 20, and also reduce the assembly difficulty.

[0253] refer to Figure 6 In some embodiments, after the step of bonding the battery cell assembly 20 to the first adhesive layer 31, the processing method further includes: curing the first adhesive layer 31.

[0254] After the step of bonding the battery cell assembly 20 to the first adhesive layer 31, that is, after step S430, the processing method further includes: S440: Curing the first adhesive layer 31.

[0255] In this step, depending on the type of the first adhesive layer 31, the first adhesive layer 31 can be cured by heating, light exposure or other means.

[0256] For example, the material of the first adhesive layer 31 includes a light-curing adhesive, and in this step, the first adhesive layer 31 is cured by light.

[0257] For example, the material of the first adhesive layer 31 includes UV epoxy adhesive, which is cured by irradiation with a UV lamp for 3 to 5 seconds.

[0258] This step is set before step S450. This step is before the intermediate module enters the housing 10 to reduce the interference caused by the curing of the first adhesive layer 31 on the wall of the housing 10. At the same time, after the first adhesive layer 31 is cured, the structure of the intermediate module is more stable, which also facilitates the subsequent assembly of the intermediate module.

[0259] In this embodiment, before bonding the intermediate module to the second adhesive layer 33, the first adhesive layer 31 is cured first, so that the battery cell assembly 20, the first adhesive layer 31 and the intermediate carrier 32 can be stably connected; at the same time, it can also reduce the interference that the housing 10 may cause to the curing of the first adhesive layer 31.

[0260] refer to Figure 6 In some embodiments, the step of placing the intermediate module inside the housing 10 and bonding it to the second adhesive layer 33, i.e., step S460, includes: The projection of the intermediate module on the corresponding inner wall of the housing 10 is located within the second adhesive layer 33.

[0261] In this step, the orthographic projection of the intermediate module onto the corresponding wall of the housing 10 reflects the area and position of the intermediate module in the direction perpendicular to the first adhesive layer 31 and the arrangement of the intermediate module, so that the orthographic projection of the intermediate module is located within the second adhesive layer 33, so that the intermediate module can be directly facing the second adhesive layer 33, thereby reducing the risk of misalignment between the intermediate module and the second adhesive layer 33 and improving the connection stability between the intermediate module and the second adhesive layer 33.

[0262] In this step, the orthographic projection of the intermediate module is located within the second adhesive layer 33, that is, the orthographic projection area of ​​the intermediate module is smaller than the area of ​​the second adhesive layer 33. The second adhesive layer 33 can cover the side of the intermediate module facing the second adhesive layer 33, so that the second adhesive layer 33 and the intermediate module can have a larger bonding area, thereby improving the connection stability between the intermediate module and the second adhesive layer 33.

[0263] In this step, the orthographic projection of the intermediate module is located within the second adhesive layer 33. The orthographic projection area of ​​the intermediate module can be equal to the area of ​​the second adhesive layer 33, that is, the orthographic projection of the intermediate module overlaps with the second adhesive layer 33. The orthographic projection area of ​​the intermediate module can also be smaller than the area of ​​the second adhesive layer 33.

[0264] When the projected area of ​​the intermediate module is smaller than the area of ​​the second adhesive layer 33, the peripheral edge of the second adhesive layer 33 can overflow to the peripheral side of the intermediate carrier 32 and form a fixing part 333. The fixing part 333 can be bonded to the peripheral side of the intermediate carrier 32, or can be further bonded to the first adhesive layer 31 and the battery cell assembly 20.

[0265] In this embodiment, the projection of the intermediate module on the inner wall of the corresponding housing 10 is located within the second adhesive layer 33, so that the intermediate module is directly facing the second adhesive layer 33. At the same time, the area of ​​the second adhesive layer 33 is greater than or equal to the projection of the intermediate module on the inner wall of the corresponding housing 10. During the process of the intermediate module being pressed against the second adhesive layer 33, the edge of the second adhesive layer 33 can overflow upward and form a fixing part 333, so as to better fix the intermediate module inside the housing 10.

[0266] refer to Figure 6 In some embodiments, the step of placing the intermediate module inside the housing 10 and bonding it to the second adhesive layer 33, i.e., step S460, further includes: The edge of the second adhesive layer 33 extends beyond the projection of the intermediate module onto the corresponding inner wall of the housing 10 by 0.5 to 1 mm.

[0267] In this step, the edge of the second adhesive layer 33 extends beyond the edge of the projection of the intermediate module onto the corresponding inner wall of the housing 10, that is, the area of ​​the orthographic projection of the intermediate module onto the corresponding inner wall of the housing 10 is smaller than the area of ​​the second adhesive layer 33; when the intermediate module is connected to the second adhesive layer 33, the edge of the second adhesive layer 33 can extend to the periphery of the intermediate module.

[0268] The dimension by which the edge of the second adhesive layer 33 extends beyond the edge of the projection of the intermediate module onto the corresponding inner wall of the housing 10 is the dimension by which the second adhesive layer 33 can extend to the periphery of the intermediate module. This dimension ranges from 0.5 to 1 mm; for example, this dimension range can be 0.5 mm, 0.6 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.9 mm, 1 mm or other values.

[0269] Since the portion of the second adhesive layer 33 extending beyond the orthographic projection of the intermediate module needs to be bonded to the periphery of the intermediate module, the size of this portion also reflects the distance between the periphery of the intermediate module and the wall of the housing 10. The larger this size, the larger the distance between the periphery of the intermediate module and the wall of the housing 10, and the lower the energy density of the battery device 100. Accordingly, this size is set to a range of 0.5 to 1 mm, so that the second adhesive layer 33 can both overflow to the periphery of the intermediate module and reduce the negative impact on the energy density of the battery device 100.

[0270] For example, the dimension of the portion of the edge of the second adhesive layer 33 that extends beyond the orthographic projection of the intermediate module is 0.5 mm. When the portion of the second adhesive layer 33 that overflows can adhere to the periphery of the intermediate module, this arrangement can better reduce the negative impact of the second adhesive layer 33 on the energy density of the battery device 100.

[0271] For example, the dimension of the portion of the edge of the second adhesive layer 33 that extends beyond the orthographic projection of the intermediate module is 0.75 mm. With this setting, the portion of the second adhesive layer 33 that overflows can not only adhere well to the periphery of the intermediate module, but also reduce the negative impact of the second adhesive layer 33 on the energy density of the battery device 100.

[0272] For example, the portion of the second adhesive layer 33 that extends beyond the orthographic projection of the intermediate module is 1 mm, so that the overflow portion of the second adhesive layer 33 can better adhere to the periphery of the intermediate module, thereby improving the connection strength and stability between the second adhesive layer 33 and the intermediate module.

[0273] This embodiment provides that the edge of the second adhesive layer 33 extends beyond the projected edge of the intermediate module, so that the second adhesive layer 33 can better overflow upward and form a fixing part 333, thereby better fixing the intermediate module in the housing 10 through the fixing part 333.

[0274] refer to Figure 6 In some embodiments, the step of placing the intermediate module inside the housing 10 and bonding it to the second adhesive layer 33, i.e., in step S460, further includes: A preset pressure is applied to the intermediate module so that a portion of the second adhesive layer 33 overflows in a direction away from the inner wall of the corresponding housing 10.

[0275] In this step, the preset pressure refers to the pressure that is pre-set and applied to the intermediate module. After the intermediate module is placed on the second adhesive layer 33, the preset pressure is applied to the intermediate module so that the intermediate carrier 32 can be better bonded to the corresponding wall of the housing 10 through the second adhesive layer 33. It can be understood that the preset pressure is mainly used to reduce the empty space between the intermediate carrier 32 and the second adhesive layer 33 so that the second adhesive layer 33 can better contact and bond with the battery cell assembly 20, without having the intermediate carrier 32 pass through the second adhesive layer 33 and directly contact the corresponding wall of the housing 10.

[0276] During the process of the intermediate module being compressed, the edge of the second adhesive layer 33 overflows towards the periphery of the intermediate module and forms a fixing part 333, so as to bond to the periphery of the intermediate module through the fixing part 333 and increase the connection area between the intermediate module and the second adhesive layer 33, thereby improving the connection strength and connection stability between the second adhesive layer 33 and the intermediate module.

[0277] For example, the fixing part 333 may be connected only to the periphery of the intermediate carrier 32, or it may be further connected to the periphery of the first adhesive layer 31 and the battery cell assembly 20.

[0278] In this embodiment, the intermediate module is pre-pressed so that the intermediate module can be better bonded to the housing 10 through the second adhesive layer 33; at the same time, the pre-pressing can also better cause the adhesive to overflow from the edge of the second adhesive layer 33 and form a fixing part 333.

[0279] refer to Figure 6 In some embodiments, after the step of placing the intermediate module inside the housing 10 and bonding it to the second adhesive layer 33, that is, after step S460, the processing method further includes: S470: Curing the second adhesive layer 33.

[0280] In this step, depending on the type of the second adhesive layer 33, the first adhesive layer 31 can be cured by heating, light exposure or other means.

[0281] For example, the material of the second adhesive layer 33 includes a thermosetting adhesive, and in this step, the second adhesive layer 33 is cured by heating or by placing it at room temperature.

[0282] For example, the material of the second adhesive layer 33 includes polyurethane structural adhesive, and the second adhesive layer 33 is cured by leaving it at room temperature for 24 hours.

[0283] In this step, after the second adhesive layer 33 is cured, the intermediate module can be stably connected to the corresponding inner wall of the housing 10; when the second adhesive layer 33 overflows to the periphery of the intermediate module to form a fixing part 333, after the second adhesive layer 33 is cured, the fixing part 333 and the main body part 332 can fix the intermediate module from different sides, so as to better fix the intermediate module in the housing 10.

[0284] After the second adhesive layer 33 has cured, the battery cell assembly 20 can be stably connected to the housing 10, and other subsequent processes can be carried out. For example, if the housing 10 in the above steps includes a frame structure 12 and a bottom plate 13, after the second adhesive layer 33 has cured, the top cover 11 can be installed on the frame structure 12 to seal the accommodating space 101.

[0285] In this embodiment, the processing method further includes curing the second adhesive layer 33 so that the second adhesive layer 33 can better bond and fix the intermediate module inside the housing 10.

[0286] refer to Figure 6 In some embodiments, prior to the step of forming the first adhesive layer 31 on the intermediate carrier 32, i.e., prior to S420, the processing method further includes: S410: Clean the adhesive surfaces of the housing 10 and the battery cell assembly 20.

[0287] In this step, impurities refer to oil stains, dust, and other impurities that adhere to the inner wall of the housing 10 and the bottom of the battery cell assembly 20.

[0288] In this step, the bonding surface of the housing 10 refers to the wall surface of the housing 10 corresponding to the second adhesive layer 33. When the housing 10 includes a top cover 11, a frame structure 12, and a bottom plate 13, the bonding surface of the housing 10 can be the surface of the top cover 11, the frame structure 12, or the bottom plate 13 facing the battery cell assembly 20. For example, the bonding surface of the housing 10 is the surface of the bottom plate 13 facing the battery cell assembly 20.

[0289] In this step, the bonding surface of the battery cell assembly 20 refers to the surface of the battery cell assembly 20 that contacts and bonds with the first adhesive layer 31. This surface can be the bottom surface of the battery cell assembly 20 along its height direction, or it can be other surfaces. The bottom surface of the example battery cell assembly 20 is the surface of the battery cell assembly 20 opposite to the electrode terminal 214.

[0290] In this step, before applying adhesive to the battery cell assembly 20, the inner wall of the housing 10 and the bottom of the battery cell assembly 20 are cleaned to reduce the negative impact of impurities on the connection stability of the battery cell assembly 20 and the first adhesive layer 31, and also to reduce the negative impact of impurities on the connection stability between the intermediate carrier 32 and the corresponding wall of the housing 10.

[0291] In this step, the bonding surfaces of the housing 10 and the battery cell assembly 20 can be cleaned by means of compressed air blowing, brush cleaning, spray cleaning, etc.

[0292] In this embodiment, the inner wall of the housing 10 and the battery cell assembly 20 are first cleaned to reduce the interference of impurities on the bonding stability, thereby improving the stability of the battery cell assembly 20 fixed to the housing 10 by the bonding structure 30.

[0293] In some embodiments, the processing method of the battery device 100 includes: S410: Clean the adhesive surfaces of the housing 10 and the battery cell assembly 20; S420: A first adhesive layer 31 is formed on the intermediate carrier 32; S430: The battery cell assembly 20 is bonded to the first adhesive layer 31 to obtain an intermediate module; S440: Curing the first adhesive layer 31; S450: A second adhesive layer 33 is formed on the wall surface of the housing 10; S460: The intermediate module is placed inside the housing 10 and bonded to the second adhesive layer 33, wherein the side of the intermediate carrier 32 facing away from the first adhesive layer 31 is bonded to the second adhesive layer 33. S470: Curing the second adhesive layer 33.

[0294] Thirdly, embodiments of this application also provide an electrical device, including a battery device 100 provided in some embodiments of the first aspect, or a battery device 100 formed by processing methods of some battery device 100 in the second aspect.

[0295] The electrical device can be a vehicle 1000, or a mobile phone, tablet, laptop, electric toy, power tool, electric vehicle, electric car, ship, spacecraft or other electrical device that uses battery device 100 as a power source or energy storage element.

[0296] In this electrical device, the battery cell assembly 20 in the battery device 100 is stably connected to the corresponding wall surface of the housing 10 through the adhesive structure 30, which reduces the risk of glue overflow between the larger side surfaces of two adjacent battery cells 21 in the battery cell assembly 20, reduces the risk of damage to the battery cells 21 during charge and discharge cycles, and improves the stability of the battery cells 21.

[0297] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: The container has storage space; A battery cell assembly is housed within the housing space; The adhesive structure includes a first adhesive layer, an intermediate carrier, and a second adhesive layer. The first adhesive layer is connected to the battery cell assembly, the intermediate carrier is connected to the side of the first adhesive layer away from the battery cell assembly, one side of the second adhesive layer is connected to the side of the housing facing the receiving space, and the other side of the second adhesive layer is connected to the side of the intermediate carrier away from the first adhesive layer. The first adhesive layer comprises an adhesive liquid of a first viscosity, and the second adhesive layer comprises an adhesive liquid of a second viscosity, wherein the first viscosity is greater than the second viscosity. In the arrangement direction of the battery cell assembly and the adhesive structure, the first adhesive layer is staggered from the battery cell assembly. or In the arrangement direction of the battery cell assembly and the adhesive structure, a portion of the first adhesive layer extends to the periphery of the battery cell assembly, and the ratio of the size of the portion of the first adhesive layer extending to the periphery of the battery cell assembly to the size of the battery cell assembly is less than or equal to 5%.

2. The battery device according to claim 1, characterized in that, The first viscosity is greater than or equal to 100,000 mPa·s.

3. The battery device according to claim 1, characterized in that, The material of the first adhesive layer includes epoxy adhesives and / or UV-curable adhesives.

4. The battery device according to claim 1, characterized in that, The second viscosity is less than or equal to 20000 mPa·s.

5. The battery device according to claim 1, characterized in that, The material of the second adhesive layer includes polyurethane structural adhesive.

6. The battery device according to claim 1, characterized in that, The intermediate carrier is an insulating structural component.

7. The battery device according to claim 1, characterized in that, The intermediate carrier is made of plastic.

8. The battery device according to any one of claims 1-7, characterized in that, The second adhesive layer includes at least two spaced-apart adhesives, each of which is connected to the housing and the intermediate carrier.

9. The battery device according to claim 8, characterized in that, The ratio of the area of ​​the second adhesive layer projected onto the corresponding wall of the box to the area of ​​the corresponding wall of the box ranges from 40% to 60%.

10. The battery device according to any one of claims 1-7, characterized in that, The thickness of the first adhesive layer is less than the thickness of the second adhesive layer.

11. The battery device according to claim 10, characterized in that, The thickness of the first adhesive layer ranges from 0.5 mm to 1 mm.

12. The battery device according to claim 10, characterized in that, The thickness of the second adhesive layer ranges from 2 mm to 2.5 mm.

13. The battery device according to any one of claims 1-7, characterized in that, The second adhesive layer includes a main body and a fixing part connected to the main body, wherein the main body is located between the intermediate carrier and the wall of the corresponding box; One end of the fixing part is connected to the main body part, and the other end of the fixing part extends along the arrangement direction of the first adhesive layer and the second adhesive layer and is at least connected to the periphery of the intermediate carrier.

14. The battery device according to claim 13, characterized in that, The fixing part is connected to the intermediate carrier and the first adhesive layer; or The fixing part is connected to the intermediate carrier, the first adhesive layer and the battery cell assembly.

15. The battery device according to claim 13, characterized in that, The orthographic projection of the intermediate carrier onto the corresponding wall of the housing covers the orthographic projection of the first adhesive layer onto the corresponding wall of the housing; and / or The orthographic projection of the second adhesive layer on the corresponding wall of the box covers the orthographic projection of the intermediate carrier on the corresponding wall of the box.

16. The battery device according to claim 15, characterized in that, The orthographic projection of the battery cell assembly onto the corresponding wall of the housing covers the orthographic projection of the first adhesive layer onto the corresponding wall of the housing.

17. The battery device according to claim 13, characterized in that, The enclosure includes a top cover, a frame structure, and a bottom plate. The accommodating space extends through the frame structure along a first direction, and the top cover and the bottom plate are respectively connected to the two ends of the frame structure along the first direction. The adhesive structure is connected to the base plate, and the fixing part is also connected to the frame structure.

18. A method for processing a battery device, characterized in that, include: A first adhesive layer is formed on the intermediate carrier; The battery cell assembly is bonded to the first adhesive layer to obtain the intermediate module; A second adhesive layer is formed on the wall surface of the box; The intermediate module is placed inside the box and bonded to the second adhesive layer, wherein the side of the intermediate carrier opposite to the first adhesive layer is bonded to the second adhesive layer.

19. The processing method according to claim 18, characterized in that, After the step of bonding the battery cell assembly to the first adhesive layer, the processing method further includes: The first adhesive layer is cured.

20. The processing method according to claim 18, characterized in that, The step of placing the intermediate module inside the housing and bonding it to the second adhesive layer includes: The projection of the intermediate module onto the wall of the corresponding housing is located within the second adhesive layer.

21. The processing method according to claim 20, characterized in that, The step of placing the intermediate module inside the housing and bonding it to the second adhesive layer further includes: The edge of the second adhesive layer extends beyond the projection of the intermediate module onto the wall of the corresponding housing by a dimension ranging from 0.5 to 1 mm.

22. The processing method according to claim 20, characterized in that, The step of placing the intermediate module inside the housing and bonding it to the second adhesive layer further includes: A preset pressure is applied to the intermediate module so that a portion of the second adhesive layer overflows in a direction away from the corresponding box wall.

23. The processing method according to claim 18, characterized in that, After the step of placing the intermediate module inside the housing and bonding it to the second adhesive layer, the processing method further includes: The second adhesive layer is cured.

24. The processing method according to claim 18, characterized in that, Prior to the step of forming the first adhesive layer on the intermediate carrier, the processing method further includes: Clean the walls of the enclosure and the bottom of the battery cell assembly.

25. An electrical appliance, characterized in that, Includes a battery device as described in any one of claims 1-17, or a battery device formed by the processing method as described in any one of claims 18-24.

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