Battery device and electric appliance

Abstract

The application discloses a battery device and a power utilization device. The battery device comprises a battery box, a battery monomer assembly, an intermediate medium film and a connecting layer. The battery box has a first box wall. The battery monomer assembly is accommodated in the battery box and arranged on one side of the first box wall in a first direction. The battery monomer assembly comprises a plurality of battery monomers. At least part of the intermediate medium film is arranged between the first box wall and at least part of the battery monomers. The intermediate medium film comprises an insulating layer and an adhesive layer. The adhesive layer is arranged on one side of the insulating layer in the first direction. The adhesive layer is a light-cured adhesive layer or a pressure-sensitive adhesive layer. The connecting layer is arranged on the other side of the insulating layer in the first direction. The connecting layer is a structural adhesive layer. The technical scheme of the application can improve the convenience of maintaining the battery device.

Description

Technical Field

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

[0002] With the increasing use of new energy vehicles, the battery, as a core component of automobiles, has gradually developed a design requirement for maintenance and recycling. Therefore, how to improve the convenience of subsequent maintenance of battery devices is an urgent problem to be solved in battery technology. Utility Model Content

[0003] The main objective of this application is to provide a battery device and electrical equipment designed to improve the ease of maintenance of the battery device.

[0004] To achieve the above objectives, the battery device proposed in this application includes: Battery box, the battery box has a first box wall; A battery cell assembly is housed within a battery box and disposed on one side of a first box wall in a first direction. The battery cell assembly includes multiple battery cells. An intermediate dielectric film, at least a portion of which is disposed between the first tank wall and at least a portion of the battery cells, the intermediate dielectric film comprising an insulating layer and an adhesive layer, the adhesive layer being disposed on one side of the insulating layer in the first direction, and the adhesive layer being a photocurable adhesive layer or a pressure-sensitive adhesive layer; and A connecting layer is disposed on the other side of the insulating layer in the first direction, and the connecting layer is a structural adhesive layer.

[0005] The battery device in this application has a connecting layer and an intermediate dielectric film stacked between the battery cell assembly and the first wall of the battery box. The intermediate dielectric film includes an insulating layer and an adhesive layer, with the adhesive layer and connecting layer located on opposite sides of the insulating layer in a first direction. In this case, connection interfaces can be formed on opposite sides of the insulating layer through the adhesive layer and the connecting layer, respectively. When it is necessary to disassemble and maintain the battery cell assembly, separation can be achieved by targeting the connection interfaces formed by the adhesive layer. For example, when the adhesive layer is located on the side of the insulating layer facing the battery cell, the battery cell can be separated from the intermediate dielectric film; when the adhesive layer is located on the side of the insulating layer facing the first box wall, the intermediate dielectric film can be separated from the first box wall, thus enabling the disassembly and removal of the battery cell. Since the adhesive layer in the intermediate dielectric film is a photocurable adhesive layer or a pressure-sensitive adhesive layer, its adhesive strength is lower than that of the structural adhesive layer. Therefore, compared to the traditional method of directly separating the interface between the battery cell and the structural adhesive layer, separating the connection interfaces formed by the adhesive layer is simpler, facilitating the disassembly and removal of the battery cell and improving the convenience of battery device maintenance. Meanwhile, regardless of whether the adhesive layer is located on the side of the insulation layer facing the battery cell or on the side of the insulation layer facing the first tank wall, the shear strength of the adhesive layer still meets the vibration resistance requirements of the battery device, allowing the battery cells to remain relatively stable inside the battery box. Furthermore, since the adhesive layer in the intermediate dielectric film is a photocurable adhesive layer or a pressure-sensitive adhesive layer, it only bonds under specific light or pressure conditions. This allows the adhesive layer and the insulation layer to be pre-integrated to form a single, integral intermediate dielectric film. For example, the adhesive layer can be coated during the insulation layer feeding process to form an integral intermediate dielectric film, which can then be simultaneously transferred to the assembly station where the battery cells are assembled. This eliminates the need to apply the adhesive layer to the insulation layer, battery cells, or the first tank wall at each assembly station, thus accelerating production and improving the production efficiency of the battery device.

[0006] In some embodiments, the plurality of battery cells include intermediate cells and end cells, with the end cells disposed on both sides of the plurality of intermediate cells in a first direction; in the first direction, an intermediate dielectric film forms a weak region on at least one side of the plurality of intermediate cells, the weak region at least partially corresponding to the end cell located on the same side of the intermediate cell, and being offset from all the intermediate cells; the adhesive force per unit area between the intermediate dielectric film and the battery cell in the weak region is less than the adhesive force per unit area in other regions of the intermediate dielectric film.

[0007] This allows for the pre-peeling and separation of the intermediate dielectric film at the edge of the battery cell assembly, i.e., the weakest area, forming a peeling point. The peeling point can then be gradually extended along the first direction, further improving the ease of disassembling the battery cell.

[0008] In some embodiments, the plurality of battery cells include intermediate cells and end cells, the end cells being disposed on both sides of the plurality of intermediate cells in a second direction, the second direction intersecting the first direction; in the second direction, an intermediate dielectric film forms a weak region on at least one side of the plurality of intermediate cells, the weak region at least partially corresponding to the end cell located on the same side of the intermediate cell, and being offset from all the intermediate cells; in the intermediate dielectric film, the adhesive layer located in the weak region and the adhesive layer located in other regions are different types of adhesives in photocurable adhesives or different types of adhesives in pressure-sensitive adhesives.

[0009] Therefore, the adhesion force per unit area between the intermediate dielectric film and the battery cell in the weak area can be reduced to that per unit area in other areas of the intermediate dielectric film. At the same time, the coating process of the adhesive layer can be simplified, which in turn improves the convenience of processing and manufacturing the intermediate dielectric film.

[0010] In some embodiments, the plurality of battery cells include intermediate cells and end cells, with end cells disposed on both sides of the plurality of intermediate cells in a second direction; in the second direction, an intermediate dielectric film forms a weak region on at least one side of the plurality of intermediate cells, the weak region at least partially corresponding to the end cell located on the same side of the intermediate cell, and is offset from all the intermediate cells; in the intermediate dielectric film, the adhesive layer located in the weak region covers a portion of the insulating layer of the corresponding region, and the adhesive layer located in other regions completely covers the insulating layer of the corresponding region.

[0011] Therefore, the adhesion force per unit area between the intermediate dielectric film and the battery cell in the weak area can be less than the adhesion force per unit area in other areas of the intermediate dielectric film; at the same time, the adhesive layer in both areas can use the same type of adhesive, which facilitates the control of adhesive raw materials.

[0012] In some embodiments, in the intermediate medium film, the adhesive layer located in the weak region includes a plurality of spaced sub-adhesive portions.

[0013] This facilitates the formation of sub-adhesive portions in various weak areas, thereby improving the uniformity of the adhesive layer's bonding in these areas.

[0014] In some embodiments, the battery device further includes an auxiliary component disposed within the battery case and abutting against the side of the end battery facing away from the intermediate battery; the auxiliary component, which is located on the same side of the intermediate battery as the weak area, has a projection on the first case wall that is at least partially located within the weak area.

[0015] This allows for easy pre-peeling of the intermediate dielectric film at the edge of the battery cell assembly, through weak areas.

[0016] In some embodiments, the adhesive layer is disposed on the side of the insulating layer facing the battery cell, and the battery device further includes a release member disposed in the weak area and located between the auxiliary member and the intermediate dielectric film; the release member extends along a third direction and protrudes from both sides of the third direction to form a plurality of battery cells, and the first direction, the second direction and the third direction intersect each other.

[0017] Therefore, the peeling component allows the user to manually or through a winding mechanism to easily and smoothly peel off the intermediate dielectric film along the first direction, further improving the convenience of disassembling the battery cell.

[0018] In some embodiments, the auxiliary component has a receiving groove on the side facing the first box wall, and the peeling component is received in the receiving groove.

[0019] As a result, the auxiliary components can be bonded more tightly to the intermediate dielectric film, improving the compactness of the structural distribution among battery devices.

[0020] In some embodiments, the stripper is a linear structure.

[0021] This allows for a relatively small and concentrated cross-sectional area, which facilitates the application of peeling force to the intermediate medium membrane while reducing the possibility of breakage, thus balancing the convenience and stability of peeling.

[0022] In some embodiments, a portion of the intermediate dielectric film also extends to adhere to the side of the auxiliary component facing away from the battery cell.

[0023] Therefore, when the intermediate medium film is peeled off by the peeling member moving along the first direction, the portion of the intermediate medium film facing away from the moving direction of the peeling member can be stably attached to the auxiliary member, reducing the possibility that the intermediate medium film may affect the peeling due to the movement of the peeling member, and improving the reliability of peeling off the intermediate medium film.

[0024] In some embodiments, the number of intermediate dielectric films is one, and it is disposed between the first tank wall and all the battery cells.

[0025] This reduces the number of intermediate dielectric membranes required, thus facilitating assembly in a single step.

[0026] In some embodiments, multiple battery cells are stacked to form a battery pack, and the battery cell assembly includes at least two battery packs arranged side by side; the number of intermediate dielectric films is at least two, and each intermediate dielectric film is disposed between a first casing wall and a battery pack.

[0027] Therefore, targeted arrangements can be made in the areas where each battery pack is located, which helps to save the amount of intermediate dielectric film used and reduce manufacturing costs.

[0028] In some embodiments, the battery cell includes a housing and an electrode assembly, the electrode assembly being disposed within the housing; The housing has a first end face opposite to the first housing wall, and the insulating film exposes at least a portion of the first end face so that at least a portion of the first end face is in contact with the adhesive layer.

[0029] Therefore, the shell can be directly bonded to the intermediate medium membrane, which helps to improve the stability of the connection between the two.

[0030] On the other hand, the electrical equipment proposed in this application includes the battery device in any of the above embodiments. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of one embodiment of the vehicle of this application; Figure 2 This is a schematic diagram of the structure of an embodiment of the battery device of this application; Figure 3 This is a schematic diagram of the structure of a single battery cell according to an embodiment of this application; Figure 4 This is a partial structural schematic diagram of an embodiment of the battery device of this application; Figure 5 This is a schematic diagram of the structure of an embodiment of the intermediate dielectric membrane of this application; Figure 6 for Figure 4 A schematic diagram of the structure with the first box wall removed.

[0033] Explanation of icon numbers: 100. Battery assembly; 1. Battery box; 1a. Receptacle; 11. Box cover; 12. Box body; 121. First box wall; 20A. Battery cell assembly; 20. Battery cell; 20C. Shell; 21. End cap; 21a. Terminal post; 22. Shell; 221. First end face; 23. Electrode assembly; 231. Tab; 25. Intermediate battery; 26. End battery; 20B. Battery pack; 30. Intermediate dielectric film; 31. Insulating layer; 33. Adhesive layer; 35. Weak area; 40. Connecting layer; 50. Auxiliary component; 51. Receptacle groove; 60. Peeling component; 200. Controller; 300. Motor; 1000. Vehicle; X. First direction; Y. Second direction; Z. Third direction.

[0034] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0036] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0037] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0038] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the word "and / or" throughout the text means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0039] A battery device, or energy storage device, is widely used not only in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in other fields. A battery device can include a battery box and individual battery cells housed within the battery box. The battery box can include a box body and a cover that fits over the box body to enclose a cavity containing the individual battery cells. The individual battery cell is the smallest unit that makes up a battery, typically including a casing and an electrode assembly housed within the casing. The electrode assembly is the component in the individual battery cell where the electrochemical reaction actually occurs, and can include a positive electrode, a negative electrode, and a separator located between them, formed by winding or stacking the positive electrode, negative electrode, and separator. Furthermore, at least two individual battery cells within the battery box can be connected in series, in parallel, or in a hybrid connection including both series and parallel connections.

[0040] Furthermore, in related technologies, the individual battery cells in the battery assembly are directly bonded to the battery box using structural adhesive. While this achieves stable installation of the battery cells within the battery box, the high adhesive strength of the structural adhesive makes it difficult to disassemble and remove the battery cells, leading to challenges in subsequent maintenance and recycling of the battery assembly.

[0041] Therefore, based on the above considerations, this application proposes a novel battery device to improve the convenience of subsequent maintenance. This battery device innovatively adds an intermediate dielectric film between the battery cells and the battery casing. The intermediate dielectric film includes a laminated insulating layer and an adhesive layer. The adhesive layer is located on one side of the insulating layer, and a connecting layer is also provided on the other side of the insulating layer. The adhesive layer is a UV-curable adhesive layer or a pressure-sensitive adhesive layer, and the connecting layer is a structural adhesive. The adhesive strength of the UV-curable adhesive layer or the pressure-sensitive adhesive layer is relatively lower than that of the structural adhesive, thus facilitating the formation of a easily peelable connection interface on one side of the adhesive layer. This allows for the removal and disassembly of the battery cells within the battery casing, improving the convenience of subsequent maintenance of the battery device. Furthermore, the inclusion of a UV-curable adhesive layer or a pressure-sensitive adhesive layer in the adhesive layer of the intermediate dielectric film allows the adhesive layer and the insulating layer to be integrated into a single unit, improving production efficiency and reducing processing speed.

[0042] Furthermore, it should be noted that the battery device proposed in this application can be applied to electrical devices. These electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Further, 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.

[0043] Furthermore, it should be noted that the battery device proposed in this application can be applied to electrical devices to provide power to them. These electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, rail trains, ships, and spacecraft. Further, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., while spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0044] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device according to an embodiment of this application.

[0045] Please refer to Figure 1 In one embodiment of this application, the vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0046] In one embodiment of this application, the battery device 100 can also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000, and can also be used to supply power to electrical appliances on the vehicle 1000.

[0047] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the structure of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a battery case 1 and a battery cell assembly 20A; the battery case 1 has a receiving cavity 1a, and the battery cell assembly 20A is disposed inside the battery case 1.

[0048] The battery box 1 can be used to form a receiving cavity 1a to provide a space for housing the battery cell assembly 20A. The battery box 1 can adopt various structures. In some embodiments, the battery box 1 can include a cover 11 and a body 12 that overlap each other to jointly define the receiving cavity 1a for housing the battery cell assembly 20A. In this case, the body 12 can provide housing support for the battery cell 20A. In addition, both the cover 11 and the body 12 can be frame structures with an opening on one side. In this case, the opening side of the cover 11 can cover the opening side of the body 12. Of course, the cover 11 can also be a plate-like structure and cover the opening side of the body 12. In addition, the battery box 1 formed by the cover 11 and the body 12 can be of various shapes, such as a cylinder, a cuboid, etc.

[0049] The battery cell assembly 20A may include multiple battery cells 20. A battery cell 20 is the smallest unit constituting the battery device 100. Multiple battery cells 20 may be connected in series, parallel, or a combination thereof; a combination thereof means that multiple battery cells 20 are connected in both series and parallel. Furthermore, multiple battery cells 20 may be stacked along one direction, such as the thickness direction of the battery cells 20, to form a battery pack 20B. The battery device 100 may include only one battery pack 20B, or it may include at least two battery packs 20B arranged side-by-side.

[0050] In addition, each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0051] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the structure of a battery cell 20 provided in some embodiments of this application. The battery cell 20 includes a housing 20C and an electrode assembly 23. The electrode assembly 23 is disposed inside the housing 20C. The housing 20C includes an end cap 21 and a shell 22. The end cap 21 covers the opening side of the shell 22.

[0052] End cap 21 refers to a component that covers the opening of housing 22 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 21 can be adapted to the shape of housing 22 to fit it. Optionally, end cap 21 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 21 is not easily deformed under pressure or impact, giving battery cell 20 higher structural strength and improving reliability. Functional components such as terminals 21a can be provided on end cap 21. Terminals 21a can be used for electrical connection with electrode assembly 23 to output or input electrical energy to battery cell 20. The material of end cap 21 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 structure can also be provided on the inner side of end cap 21. The insulating structure can be used to isolate electrical components inside housing 22 from end cap 21 to reduce the risk of short circuits. For example, the insulating structure can be made of plastic, rubber, etc.

[0053] The housing 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 23, electrolyte, and other components. The housing 22 and the end cap 21 can be independent components. An opening can be provided on the housing 22, and the end cap 21 can be used to close the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 21 and the housing 22 can be integrated. Specifically, the end cap 21 and the housing 22 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 22, the end cap 21 closes the housing 22. The housing 22 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the housing 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special limitations on this.

[0054] Electrode assembly 23 is the component in the battery cell 20 where the electrochemical reaction occurs. The casing 22 may contain one or more electrode assemblies 23. The electrode assembly 23 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 electrode body of the electrode assembly 23, while the portions of the positive and negative electrode sheets without active material each constitute a tab 231. The positive and negative tabs may be located together at one end of the electrode body or separately at both ends of the electrode body. During the charging and discharging process of the battery device 100, the positive and negative active materials react with the electrolyte, and the tabs 231 connect to the terminals 21a to form a current loop.

[0055] Please refer to the reference. Figure 2 , Figure 4 as well as Figure 5 In one embodiment of this application, the battery box 1 has a first box wall 121, and the battery device 100 further includes an intermediate dielectric film 30 and a connecting layer 40; the battery cell assembly 20A is disposed on one side of the first box wall 121 in the first direction X, at least a portion of the intermediate dielectric film 30 is disposed between the first box wall 121 and at least a portion of the battery cell 20, the intermediate dielectric film 30 includes an insulating layer 31 and an adhesive layer 33, the adhesive layer 33 is disposed on one side of the insulating layer 31 in the first direction X, and the adhesive layer 33 is a photocurable adhesive layer or a pressure-sensitive adhesive layer; the connecting layer 40 is disposed on the other side of the insulating layer 31 in the first direction X, and the connecting layer 40 is a structural adhesive layer.

[0056] The first enclosure wall 121 can be used to install the battery cells 20. When the battery box 1, as described above, includes a box body 12 and a cover 11 that closes to the box body 12, the first enclosure wall 121 can be located on the box body 12, and is the enclosure wall of the box body 12 opposite to the cover 11. For example, when the battery device 100 is in normal installation and use, with the ground as a reference, the first direction X can be vertical, the cover 11 can be placed on top of the box body 12, and the first enclosure wall 121 can be the bottom wall of the box body 12 to support the battery cells 20 housed within the battery box 1.

[0057] The intermediate dielectric film 30 can be disposed between the battery cell 20 and the first casing wall 121 as an intermediate medium, so that a first connection interface can be formed between the battery cell 20 and the intermediate dielectric film 30, and a second connection interface can be formed between the intermediate dielectric film 30 and the first casing wall 121. This allows for separation of the battery cell 20 from the battery casing 1 during subsequent disassembly of the battery cell 20, by separating one of the connection interfaces. The phrase "at least a portion of the intermediate dielectric film 30 is disposed between the first casing wall 121 and at least a portion of the battery cell 20" means that the intermediate dielectric film 30 can be entirely disposed between the first casing wall 121 and the battery cell 20, corresponding to some or all of the battery cell 20; alternatively, the intermediate dielectric film 30 can be partially disposed between the first casing wall 121 and the battery cell 20, corresponding to some or all of the battery cell 20, with the remaining portion disposed in other locations, such as, as described below, on the auxiliary component 50 on one side of the battery cell assembly 20A.

[0058] The insulating layer 31 serves as an insulation layer to improve the insulation and protection effect of the intermediate dielectric film 30 between the battery cell 20 and the first tank wall 121. The insulating layer 31 can be a polyethylene terephthalate film, a polycarbonate film, or a polyimide film, etc., and this application does not limit the type of the insulating layer 31.

[0059] The adhesive layer 33 is disposed on one side of the insulating layer 31 in the first direction X, and the connecting layer 40 is disposed on the other side of the insulating layer 31 in the first direction X. This means that the adhesive layer 33 can be disposed on the side of the insulating layer 31 facing the battery cell 20, allowing the intermediate dielectric film 30 to be bonded to the battery cell 20. The connecting layer 40 is disposed between the first casing wall 121 and the insulating layer 31, connecting the intermediate dielectric film 30 to the first casing wall 121, thereby achieving an indirect connection of the battery cell assembly 20A to the first casing wall 121. In this case, when disassembling the battery cell 20, the connection interface between the intermediate dielectric film 30 and the battery cell 20 can be separated.

[0060] Alternatively, the adhesive layer 33 can be disposed between the first casing wall 121 and the insulating layer 31, while the connecting layer 40 is disposed on the side of the insulating layer 31 facing the battery cell 20. In this case, the connection interface between the intermediate dielectric film 30 and the first casing wall 121 can be separated when the battery cell 20 is subsequently disassembled.

[0061] The adhesive layer 33, in some embodiments, can be a photocurable adhesive layer. A photocurable adhesive layer refers to an adhesive layer that cures under light conditions, triggering a curing mechanism to bond the insulating layer 31 to the battery cell 20 or the first casing wall 121. The light conditions can be ultraviolet light, visible light, or a mixed light source of ultraviolet and visible light. Therefore, the photocurable adhesive layer can be ultraviolet-cured polyurethane acrylate adhesive, ultraviolet-cured epoxy acrylate adhesive, visible light-cured polyurethane acrylate adhesive, or visible light-cured acrylate adhesive; this application does not limit the type of photocurable adhesive layer. Alternatively, the photocurable adhesive layer can be applied during the feeding process of the insulating layer 31. Afterwards, at the assembly station of the battery cell 20, the battery cell 20 or the first casing wall 121 is bonded to the intermediate dielectric film 30, and then the photocurable adhesive layer is cured by light irradiation, thus achieving the connection between the battery cell 20 or the first casing wall 121 and the intermediate dielectric film 30.

[0062] In other embodiments, the adhesive layer 33 can be a pressure-sensitive adhesive layer. A pressure-sensitive adhesive layer refers to a layer that bonds the insulating layer 31 to the battery cell 20 by applying pressure. This application does not limit the type of pressure-sensitive adhesive layer, which can be an acrylic-based or silicone-based layer. Furthermore, the pressure-sensitive adhesive layer can be applied during the feeding process of the insulating layer 31; alternatively, it can be pre-laminated onto the surface of the insulating layer 31 and covered with a release film for protection. During use, the release film can be removed to directly attach it to the battery cell 20. The connecting layer 40 can be a structural adhesive layer, which can give it high adhesive strength to improve the stability of the battery cell assembly 20A installed in the battery box 1. This structural adhesive layer can be polyurethane structural adhesive or epoxy resin structural adhesive, etc., and this application does not limit the type of the connecting layer 40.

[0063] The battery device 100 in this application has a connecting layer 40 and an intermediate dielectric film 30 stacked between the battery cell assembly 20A and the first wall 121 of the battery box 1. The intermediate dielectric film 30 includes an insulating layer 31 and an adhesive layer 33, with the adhesive layer 33 and the connecting layer 40 located on opposite sides of the insulating layer 31 in the first direction X. In this case, a connection interface can be formed on opposite sides of the insulating layer 31 through the adhesive layer 33 and the connecting layer 40, respectively. When it is necessary to disassemble and maintain the battery cell assembly 20A, the connection interface formed by the adhesive layer 33 can be used for separation. For example, when the adhesive layer 33 is located on the side of the insulating layer 31 facing the battery cell 20, the battery cell 20 can be separated from the intermediate dielectric film 30; when the adhesive layer 33 is located on the side of the insulating layer 31 facing the first wall 121, the intermediate dielectric film 30 can be separated from the first wall 121, thus enabling the disassembly and removal of the battery cell 20. At this point, since the adhesive layer 33 in the intermediate dielectric film 30 is a photocurable adhesive layer or a pressure-sensitive adhesive layer, its adhesive strength is lower than that of the structural adhesive layer. Therefore, compared with the traditional method of directly separating the interface between the battery cell 20 and the structural adhesive layer, the separation of the connection interface formed by the adhesive layer 33 is simpler, making it easier to disassemble and remove the battery cell 20, thereby improving the convenience of maintaining the battery device 100. Furthermore, regardless of whether the adhesive layer 33 is located on the side of the insulating layer 31 facing the battery cell 20 or on the side of the insulating layer 31 facing the first housing wall 121, the shear strength of the adhesive layer 33 still meets the vibration resistance requirements of the battery device 100, allowing the battery cell 20 to remain relatively stable within the battery box 1. Furthermore, since the adhesive layer 33 in the intermediate dielectric film 30 is a light-curing adhesive layer or a pressure-sensitive adhesive layer, the adhesive layer 33 only bonds under corresponding light or pressure conditions. This allows the adhesive layer 33 and the insulating layer 31 to be pre-integrated to form an integral intermediate dielectric film 30. For example, during the feeding process of the insulating layer 31, the adhesive layer 33 is coated to form an integral intermediate dielectric film 30, so that it can be simultaneously transferred to the assembly station for assembling with the battery cell assembly 20A. This eliminates the need to temporarily coat the insulating layer 31, the battery cell 20, or the first box wall 121 at the assembly station each time, thereby speeding up the production cycle and improving the production efficiency of the battery device 100.

[0064] Please refer to Figure 4In one embodiment of this application, the adhesive layer 33 is disposed on the side of the insulating film facing the battery cell 20, and the connecting layer 40 is disposed between the first casing wall 121 and the insulating layer 31.

[0065] In this embodiment, the intermediate dielectric membrane 30 can be bonded to the first housing wall 121 using a connecting layer 40 with a structural adhesive layer. Relative vibration mainly occurs between the combination of the battery cell assembly 20A and the intermediate dielectric membrane 30 and the first housing wall 121. The relatively high adhesive strength of the structural adhesive layer improves the stability of the battery cell assembly 20A and the intermediate dielectric membrane 30 within the battery housing 1, thereby further enhancing the reliability of the battery device 100. Furthermore, when disassembly is required, the interface between the intermediate dielectric membrane 30 and the battery cell 20 can be separated, allowing direct access to the desired battery cell 20 after peeling off the intermediate dielectric membrane 30.

[0066] Please refer to the reference. Figure 2 , Figure 4 as well as Figure 6 In one embodiment of this application, the plurality of battery cells 20 includes intermediate batteries 25 and end batteries 26. The end batteries 26 are disposed on both sides of the plurality of intermediate batteries 25 in a second direction Y, which intersects with the first direction X. In the second direction Y, an intermediate dielectric film 30 forms a weak region 35 on at least one side of the plurality of intermediate batteries 25. The weak region 35 corresponds at least partially to the end battery 26 located on the same side of the intermediate battery 25 and is offset from all the intermediate batteries 25. The adhesion force per unit area between the intermediate dielectric film 30 and the battery cell 20 in the weak region 35 is less than the adhesion force per unit area in other areas of the intermediate dielectric film 30.

[0067] The intermediate battery 25 refers to a plurality of battery cells 20 located in the middle along the second direction Y. The end battery 26 refers to the outermost battery cell 20 among the plurality of battery cells 20 along the second direction Y. The plurality of battery cells 20 can be stacked along the second direction Y to form a battery pack 20B. Each battery pack 20B may include two end batteries 26, and the remaining battery cells 20 in the battery pack 20B may be located within these two end batteries 26. Furthermore, when the first direction X is vertical as described above, the second direction Y can be a horizontal direction. Alternatively, when the battery cell 20 is a prismatic battery, the second direction Y can be the thickness direction of the battery cell 20. Of course, in some embodiments, it can also be the length direction of the battery cell 20.

[0068] The intermediate dielectric film 30 has a weak region 35 formed on at least one side of the plurality of intermediate cells 25. This means that, for the two end cells 26 in each battery pack 20B, the intermediate dielectric film 30 may have a weak region 35 formed at the position corresponding to one of the end cells 26, or it may have a weak region 35 formed at the positions corresponding to both end cells 26.

[0069] The weak region 35 corresponds at least partially to the end battery 26 located on the same side as the intermediate battery 25, meaning that the projection of the weak region 35 and the opposite end battery 26 on the first housing wall 121 at least partially overlaps. The weak region 35 is misaligned with all the intermediate batteries 25, meaning that the projection of the weak region 35 and all the intermediate batteries 25 on the first housing wall 121 is misaligned.

[0070] Adhesion force refers to the interfacial bonding strength between the adhesive layer 33 and the battery cell 20, reflecting the magnitude of the force required to separate the adhesive layer 33 from the surface of the battery cell 20. Adhesion force can be measured through a 180° peel strength test, for example, according to GB / T 2792-2014 "Test Method for Peel Strength of Adhesive Tapes" or ASTM D3330 / D3330M "Standard Test Method for Peel Adhesion of Pressure-Sensitive Adhesive Tapes".

[0071] In this embodiment, a weak region 35 is formed in the intermediate dielectric film 30 at the corresponding end of the battery 26, making the adhesive force per unit area at this location relatively smaller than in other areas. This facilitates the pre-peeling and separation of the intermediate dielectric film 30 at the edge of the battery cell assembly 20A, i.e., the weak region 35, forming a peeling point. The peeling point can then be gradually extended along the second direction Y, further improving the ease of disassembling the battery cell 20.

[0072] In one embodiment of this application, the adhesive layer 33 located in the weak region 35 of the intermediate dielectric film 30 has a different adhesive type than the adhesive layers 33 located in other regions. This allows the adhesive strength of the adhesive layer 33 located in the weak region 35 to be lower than that of the adhesive layers 33 located in other regions, thereby facilitating the peeling of the intermediate dielectric film 30 at the weak region 35 to form a starting point. The term "different adhesive type" means that the adhesive layer 33 located in the weak region 35 can be a different type of photocurable adhesive or a different type of pressure-sensitive adhesive than the adhesive layers 33 located in other regions.

[0073] Adhesion strength refers to the adhesive force per unit area.

[0074] In this embodiment, the adhesive type of the adhesive layer 33 located in the weak region 35 is different from that of the adhesive layers 33 in other regions. This results in a relatively low adhesive strength in the adhesive layer 33 located in the weak region 35, meaning the adhesion force per unit area between the intermediate dielectric film 30 and the battery cell 20 in the weak region 35 is less than the adhesion force per unit area in other regions of the intermediate dielectric film 30. For example, the adhesive layer 33 in the weak region 35 can be a polyurethane acrylate adhesive with lower adhesion strength, while the adhesive layers in other regions can be acrylate adhesives with higher adhesion strength. Of course, other types of adhesives can also be used for the weak region 35 and the other regions, as long as the adhesion strength of the adhesive layer 33 in the weak region 35 is lower. Furthermore, by setting the adhesive type of the bonding layer 33 in the weak area 35 to be different from that in other areas, the adhesion force per unit area between the intermediate dielectric film 30 and the battery cell 20 in the weak area 35 can be reduced to less than the adhesion force per unit area in other areas of the intermediate dielectric film 30. This simplifies the coating process of the bonding layer 33, for example, continuous coating can be performed in their respective areas, and the coating thickness can be consistent, thereby improving the convenience of processing and manufacturing the intermediate dielectric film 30.

[0075] Of course, in other embodiments, the adhesive layer 33 located in the weak region 35 in the intermediate dielectric film 30 may be configured to cover part of the insulating layer 31 in the corresponding region, and the adhesive layer 33 located in other regions may completely cover the insulating layer 31 in the corresponding region, so that the intermediate dielectric film 30 at the weak region 35 can be easily peeled off to form a starting point.

[0076] The adhesive layer 33 located in the weak region 35 can cover a portion of the insulating layer 31 in the corresponding region. This means that the adhesive layer 33 in the weak region 35 is a localized coating, resulting in some areas having the insulating layer 31 while others directly expose the insulating layer 31. This localized coating can be formed as described below, including multiple spaced sub-adhesive portions, or it can be a continuous S-shape or U-shape, etc., achieving the goal of having an adhesive layer 33 in some areas of the weak region 35 and directly exposing the insulating layer 31 in others.

[0077] When the adhesive layer 33 located in other areas completely covers the insulating layer 31 in the corresponding area, it means that the adhesive layer 33 in that area is a continuous and complete coating, and the insulating layer 31 in the entire area is covered by the adhesive layer 33.

[0078] In this embodiment, the adhesive layer 33 of the weak area 35 is set to cover part of the insulating layer 31 within the weak area 35, while the adhesive layer 33 of other areas is a continuous and complete layer, so that the adhesive layer 33 in the two areas can use the same type of adhesive, thereby facilitating the control of adhesive raw materials.

[0079] In one embodiment of this application, in the intermediate dielectric film 30, the adhesive layer 33 located in the weak region 35 includes a plurality of spaced sub-adhesive portions.

[0080] In this embodiment, multiple spaced-apart sub-adhesive portions can be distributed at various locations in the weak region 35 to improve the uniformity of adhesion of the adhesive layer 33 throughout the weak region 35. These spaced-apart sub-adhesive portions can be arranged in at least two rows and at least two columns along the second direction Y and a third direction Z intersecting the first direction X and the second direction Y on the insulating layer 31. Alternatively, the multiple spaced-apart sub-adhesive portions can be arranged individually along either the second direction Y or the third direction Z; this application does not limit the arrangement of the multiple spaced-apart sub-adhesive portions. Furthermore, the projected shape of the sub-adhesive portions on the first housing wall 121 can be square, rectangular, or circular, etc., and this application does not limit this. Additionally, the shape and area of ​​each sub-adhesive portion can be partially identical, all identical, or all different.

[0081] Please refer to Figure 4 In one embodiment of this application, the battery device 100 further includes an auxiliary member 50, which is disposed inside the battery box 1 and abuts against the side of the end battery 26 facing away from the intermediate battery 25; the auxiliary member 50, which is located on the same side of the intermediate battery 25 as the weak area 35, has its projection on the first box wall 121 at least partially located within the weak area 35.

[0082] The auxiliary component 50 can be an end plate. The battery cell assembly 20A can have end plates on both sides in the second direction Y, so as to clamp and restrict the expansion of the battery cell 20 through the two end plates. Of course, the auxiliary component 50 can also be a heat exchange insulating pad set between the battery box 1 and the end battery 26, so as to play a role in buffering and insulation.

[0083] In this embodiment, the auxiliary component 50 corresponding to the weak area 35 is configured to at least partially overlap the projection on the first box wall 121, so that the intermediate dielectric film 30 can be pre-peeled through the weak area 35 at the edge position of the battery cell assembly 20A.

[0084] Please refer to Figure 4 In one embodiment of this application, the battery device 100 further includes a peeling member 60, which is disposed in the weak region 35 and located between the auxiliary member 50 and the intermediate dielectric film 30. The peeling member 60 extends along the third direction Z and has multiple battery cells 20 protruding from both sides of the third direction Z. The first direction X, the second direction Y and the third direction Z intersect each other.

[0085] The peeling member 60 can be manually driven by a user or a winding mechanism to move along the second direction Y. The peeling member 60 can be a linear structure as described below, or a sheet structure; this application does not limit this. Furthermore, when a weak area is provided on one side of the battery cell assembly 20A in the second direction Y, the number of peeling members 60 can be one, achieving unilateral peeling between the intermediate dielectric film 30 and the battery cell assembly 20A. Of course, when weak areas are provided on both sides of the battery cell assembly 20A in the second direction Y, the number of peeling members 60 can be two, achieving bilateral peeling between the intermediate dielectric film 30 and the battery cell assembly 20A. Additionally, the peeling member 60 can be disposed between the intermediate dielectric film 30 and the auxiliary member 50, including the case where the peeling member 60 is disposed between the adhesive layer 33 and the auxiliary member 50; it also includes the case where the peeling member 60 is embedded in the adhesive layer 33 and located between the insulating layer 31 and the auxiliary member 50. Furthermore, when the first direction X and the second direction Y are, as described above, vertical and horizontal, the third direction Z can be another horizontal direction.

[0086] In this embodiment, by providing a peeling member 60 between the auxiliary member 50 and the intermediate dielectric film 30, and by having the peeling member 60 extend from both ends of the auxiliary member 50 and the intermediate dielectric film 30 in the third direction Z, the intermediate dielectric film 30 and the battery cell 20 can be easily and smoothly separated by the user manually or by a winding mechanism along the second direction Y, thereby further improving the convenience of disassembling the battery cell 20.

[0087] Additionally, it should be noted that when the adhesive layer 33 in the intermediate dielectric film 30 is disposed between the insulating layer 31 and the first box wall 121, the release member 60 can be disposed between the intermediate dielectric film 30 and the first box wall 121, including the case where the release member 60 is disposed between the adhesive layer 33 and the first box wall 121; of course, it also includes the case where the release member 60 is embedded in the adhesive layer 33 and located between the insulating layer 31 and the first box wall 121.

[0088] Please refer to Figure 4 In one embodiment of this application, the auxiliary member 50 is provided with a receiving groove 51 on the side facing the first box wall 121, and the peeling member 60 is received in the receiving groove 51.

[0089] In this embodiment, an accommodating groove 51 for accommodating the peeling member 60 is provided on the auxiliary member 50, so that the auxiliary member 50 can fit more tightly with the intermediate dielectric film 30, thereby improving the compactness of the structural distribution among the battery devices 100.

[0090] Please refer to Figure 4 In one embodiment of this application, the peeling member 60 is a linear structure.

[0091] In this embodiment, the peeling member 60 is configured as a linear structure, which allows for a relatively small and concentrated cross-sectional area. This facilitates the application of peeling force between the intermediate dielectric film 30 and the battery cell 20, while reducing the possibility of breakage, thus balancing the convenience and stability of peeling. Furthermore, the linear structure also allows the peeling member 60 to be flexible, facilitating its arrangement and movement.

[0092] Please refer to Figure 4 In one embodiment of this application, a portion of the intermediate dielectric film 30 extends to adhere to the side of the auxiliary member 50 opposite to the battery cell 20.

[0093] In this embodiment, the intermediate dielectric film 30 is further extended to adhere to the side of the auxiliary member 50 opposite to the battery cell 20, so that when the intermediate dielectric film 30 is peeled off by the peeling member 60 moving along the second direction Y, the portion of the intermediate dielectric film 30 opposite to the moving direction of the peeling member 60 can be stably adhered to the auxiliary member 50, reducing the possibility that the intermediate dielectric film 30 may affect the peeling due to the movement of the peeling member 60, and improving the reliability of peeling off the intermediate dielectric film 30.

[0094] Additionally, it should be noted that the portion of the intermediate dielectric film 30 extending to the side of the auxiliary component 50 facing away from the battery cell 20 may be formed as a weak region 35, or it may not form a weak region 35 and may belong to other regions as described above, excluding the weak region.

[0095] In one embodiment of this application, there is one intermediate dielectric membrane 30, which is disposed between the first box wall 121 and all the battery cells 20.

[0096] In this embodiment, by using one intermediate dielectric film 30 for all battery cells 20, the number of intermediate dielectric films 30 can be reduced, thereby facilitating one-time assembly.

[0097] In one embodiment of this application, a plurality of battery cells 20 are stacked along a second direction Y to form a battery pack 20B. The battery cell assembly 20A includes at least two battery packs 20B arranged side by side along a third direction Z. The number of intermediate dielectric films 30 is at least two, and each intermediate dielectric film 30 is disposed between the first housing wall 121 and a battery pack 20B.

[0098] In this embodiment, each intermediate dielectric film 30 is used for one battery pack 20B, which allows for targeted arrangement in the area where each battery pack 20B is located, thereby saving the amount of intermediate dielectric film 30 used and reducing manufacturing costs.

[0099] In one embodiment of this application, the outer casing 20C has a first end face 221 opposite to the first casing wall 121, and at least a portion of the first end face 221 is in contact with the adhesive layer 33.

[0100] The first end face 221 of the outer casing 20C can be disposed on the side of the casing 22 opposite to the end cap 21. To improve the insulation protection of the battery cell 20, when the outer surface of the outer casing 20C is covered with an insulating film, the first end face 221 may only have a portion of the insulating film, or it may not have an insulating film at all; or at least a portion of the insulating film may be exposed on the first end face 221. The type of this insulating film can be the same as the type of insulating layer 31 described above.

[0101] In this embodiment, at least a portion of the first end face 221 is in contact with the adhesive layer 33, so that the housing 22 can be directly bonded to the intermediate medium film 30, thereby improving the stability of the connection between the two.

[0102] Please refer to the reference. Figure 2 ,as well as Figures 4 to 6In one embodiment of this application, the battery device 100 includes a battery case 1, a battery cell assembly 20A, an intermediate dielectric film 30, and a connecting layer 40; the battery case 1 has a first case wall 121; the battery cell assembly 20A is housed in the battery case 1 and disposed on one side of the first case wall 121 in a first direction X, and the battery cell assembly 20A includes a plurality of battery cells 20; at least a portion of the intermediate dielectric film 30 is disposed between the first case wall 121 and at least a portion of the battery cells 20, and the intermediate dielectric film 30 includes an insulating layer 31 and an adhesive layer 33, the adhesive layer 33 is disposed on the side of the insulating layer 31 facing the battery cells 20, and the adhesive layer 33 is a photocurable adhesive layer or a pressure-sensitive adhesive layer; the connecting layer 40 is disposed between the first case wall 121 and the insulating layer 31, and the connecting layer 40 is a structural adhesive layer. The plurality of battery cells 20 includes intermediate cells 25 and end cells 26. The end cells 26 are disposed on both sides of the plurality of intermediate cells 25 in a second direction Y, which intersects with the first direction X. In the second direction Y, an intermediate dielectric film 30 forms a weak region 35 on at least one side of the plurality of intermediate cells 25. The weak region 35 corresponds at least partially to the end cell 26 located on the same side as the intermediate cell 25 and is offset from all the intermediate cells 25. In the intermediate dielectric film 30, the adhesive layer 33 located in the weak region 35 is connected to the end cell 26 located on the same side as the intermediate cell 25. The adhesive layers 33 in other areas are different types of UV-curable adhesives or different types of pressure-sensitive adhesives, and the adhesion strength of the adhesive layer 33 located in the weak area 35 is less than that of the adhesive layers 33 located in other areas. The battery device 100 also includes an auxiliary component 50, which is disposed inside the battery box 1 and abuts against the side of the end battery 26 facing away from the intermediate battery 25. The auxiliary component 50, which is located on the same side of the intermediate battery 25 as the weak area 35, has its projection on the first box wall 121 at least partially located within the weak area 35. The battery device 100 also includes a release member 60, which is disposed within the weak area 35 and located between the auxiliary component 50 and the intermediate dielectric film 30. The release member 60 extends along a third direction Z and has multiple battery cells 20 protruding from both sides along the third direction Z, which intersects with the second direction Y. The auxiliary component 50 has a receiving groove 51 on the side facing the first box wall 121, and the peeling component 60 is housed in the receiving groove 51; the peeling component 60 has a linear structure; a portion of the intermediate dielectric film 30 extends to adhere to the side of the auxiliary component 50 facing away from the battery cell 20. There is one intermediate dielectric film 30, which is located between the first box wall 121 and all the battery cells 20.

[0103] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the inventive concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A battery device, characterized in that, include: A battery box having a first box wall; A battery cell assembly, wherein the battery cell assembly is housed within the battery box and disposed on one side of the first box wall in a first direction, the battery cell assembly comprising a plurality of battery cells; An intermediate dielectric film, at least a portion of which is disposed between the first tank wall and at least a portion of the battery cells, the intermediate dielectric film comprising an insulating layer and an adhesive layer, the adhesive layer being disposed on one side of the insulating layer in the first direction, the adhesive layer being a photocurable adhesive layer or a pressure-sensitive adhesive layer; as well as A connecting layer is disposed on the other side of the insulating layer in the first direction, and the connecting layer is a structural adhesive layer.

2. The battery device as claimed in claim 1, characterized in that, The plurality of battery cells include intermediate cells and end cells, wherein the end cells are disposed on both sides of the plurality of intermediate cells in a second direction, the second direction intersecting the first direction; In the second direction, the intermediate dielectric film has a weak region formed on at least one side of the plurality of intermediate cells, the weak region at least partially corresponding to the end cell located on the same side of the intermediate cell, and is offset from all the intermediate cells; The adhesion force per unit area between the intermediate dielectric film and the battery cell in the weak region is less than the adhesion force per unit area in other regions of the intermediate dielectric film.

3. The battery device as claimed in claim 1, characterized in that, The plurality of battery cells include intermediate cells and end cells, wherein the end cells are disposed on both sides of the plurality of intermediate cells in a second direction, the second direction intersecting the first direction; In the second direction, the intermediate dielectric film has a weak region formed on at least one side of the plurality of intermediate cells, the weak region at least partially corresponding to the end cell located on the same side of the intermediate cell, and is offset from all the intermediate cells; In the intermediate medium film, the adhesive layer located in the weak region is a different type of adhesive from the adhesive layer located in other regions, or a different type of adhesive from the light-curing adhesive.

4. The battery device as claimed in claim 1, characterized in that, The plurality of battery cells include intermediate cells and end cells, wherein the end cells are disposed on both sides of the plurality of intermediate cells in a second direction, the second direction intersecting the first direction; In the second direction, the intermediate dielectric film has a weak region formed on at least one side of the plurality of intermediate cells, the weak region at least partially corresponding to the end cell located on the same side of the intermediate cell, and is offset from all the intermediate cells; In the intermediate dielectric film, the adhesive layer located in the weak region covers a portion of the insulating layer in the corresponding region, while the adhesive layer located in other regions completely covers the insulating layer in the corresponding region.

5. The battery device as claimed in claim 4, characterized in that, In the intermediate medium film, the adhesive layer located in the weak region includes a plurality of spaced sub-adhesive portions.

6. The battery device according to any one of claims 2 to 5, characterized in that, The battery device also includes an auxiliary component, which is disposed inside the battery box and abuts against the side of the end battery facing away from the middle battery. The auxiliary component, which is located on the same side of the intermediate battery as the weak area, has its projection on the first casing wall at least partially located within the weak area.

7. The battery device as claimed in claim 6, characterized in that, The adhesive layer is disposed on the side of the insulating layer facing the battery cell. The battery device also includes a release element, which is disposed in the weak area and located between the auxiliary element and the intermediate dielectric film. The stripper extends along a third direction and has multiple battery cells protruding from both sides of the third direction, with the first direction, the second direction, and the third direction intersecting each other.

8. The battery device as claimed in claim 7, characterized in that, The auxiliary component has a receiving groove on the side facing the first box wall, and the peeling component is received in the receiving groove; And / or, the stripper is a linear structure.

9. The battery device as claimed in claim 6, characterized in that, A portion of the intermediate dielectric film also extends to adhere to the side of the auxiliary component opposite to the battery cell.

10. The battery device according to any one of claims 1 to 5, characterized in that, The intermediate dielectric membrane is one in number and is disposed between the first box wall and all the battery cells; Alternatively, multiple battery cells may be stacked to form a battery pack, the battery cell assembly including at least two battery packs side by side; the number of intermediate dielectric films is at least two, each intermediate dielectric film being disposed between the first casing wall and one of the battery packs.

11. The battery device according to any one of claims 1 to 5, characterized in that, The battery cell includes a casing and an electrode assembly, the electrode assembly being disposed inside the casing, and the outer surface of the casing being covered with an insulating film; The housing has a first end face opposite to the first housing wall, and the insulating film exposes at least a portion of the first end face so that at least a portion of the first end face contacts the adhesive layer.

12. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1 to 11.

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