Battery device, electric equipment and adhesive film

Abstract

The utility model provides a battery device, electric equipment and an adhesive film, and the battery device comprises a battery box body, a plurality of battery monomers and the adhesive film; wherein the adhesive film is attached to the first surface of the battery monomer; the adhesive film comprises a first film layer structure and a second film layer structure which are arranged in a stacked mode. The first film layer structure comprises two polyamide films (PA films) which are stacked; the total thickness of the two PA films is larger than 30 micrometers, and the thickness of each PA film is smaller than or equal to 30 micrometers. Through the mode, each layer of PA film can be directly prepared by adopting a two-way extension process, so that the first film layer structure has relatively high stiffness and modulus, the puncture resistance of the adhesive film is improved, and the reliability of a battery device is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery field especially relates to a battery device, electrical equipment and adhesive film. BACKGROUND

[0002] The battery monomer usually adopts adhesive film to fix and insulate protection to the tab, the battery monomer termination edge and the battery monomer and aluminum plastic film when designing. Among them, the adhesive film can be used to fix between the battery monomer termination edge and the aluminum plastic film. Because there may be some free activity of the particle such as debris in the inside of the battery device, when the battery monomer expands, the battery monomer outer wall may be pierced by the particle, thereby the risk of battery short circuit appears. SUMMARY

[0003] The technical problem solved by the present application is to provide a battery device, electrical equipment and adhesive film with excellent particle resistance.

[0004] To solve the above technical problem, in a first aspect, the present application adopts a technical scheme to provide a battery device, the battery device comprising:

[0005] A battery box body;

[0006] A plurality of battery monomers accommodated in the battery box body;The battery monomer comprises a shell and an electrode assembly accommodated in the shell;

[0007] An adhesive film attached to the first surface of the battery monomer;The adhesive film comprises a first film layer structure and a second film layer structure stacked;

[0008] Among them, the first film layer structure comprises two polyamide films (PA films) stacked;The total thickness of the two PA films is greater than 30 microns, and the thickness of each PA film is less than or equal to 30 microns.

[0009] In the above technical scheme, by setting the first film layer structure comprising two polyamide films (PA films) stacked, the total thickness of the two PA films is greater than 30 microns, and the thickness of each PA film is less than or equal to 30 microns, therefore, each layer of PA film can be directly prepared by biaxial stretching process, so that the first film layer structure has higher stiffness and modulus, improves the puncture resistance of the adhesive film, and improves the reliability of the battery device.

[0010] In some embodiments, at least one edge of the first film layer structure protrudes from the second film layer structure and is suspended to form a flange structure;The flange structure is bent and attached to the second surface of the battery monomer.

[0011] In the technical scheme, the first film layer structure is arranged to protrude the second film layer structure at least at one edge, and the protruding structure is arranged to be suspended to form a flanging structure, and the flanging structure is arranged to be attached to the second surface of the battery monomer after being bent, so that different parts of the adhesive film and the battery monomer are bonded together, and the flanging structure does not pull the main thickening layer when the edge area is bent, and the edge area is easier to bend, and the probability of wrinkles of the adhesive film in use is reduced, and the bonding effect of the adhesive film is improved.

[0012] In some embodiments, the total thickness of the two PA films is greater than or equal to 40 microns and less than or equal to 55 microns.

[0013] In the technical scheme, the total thickness of the two PA films is greater than or equal to 40 microns and less than or equal to 55 microns, so that the hardness of the first film layer structure is improved, and the performance of resisting iron particles below 0.6 millimeters (mm) is improved. In addition, since the total thickness of the two PA films is less than or equal to 55 microns, the thickness of the adhesive film is small, the spacing between adjacent two battery monomers is small, and the energy density of the battery device is improved.

[0014] In some embodiments, one of the two PA films has a thickness of 30 microns.

[0015] In the technical scheme, one of the two PA films has a thickness of 30 microns, and therefore the thickness of the other PA film is greater than or equal to 10 microns and less than or equal to 25 microns. The single-layer PA film with a thickness of 30 microns or less can fully utilize the advantages of the biaxial stretching process, improve the stiffness and modulus of the first film layer structure, and thus make the flanging structure easier to fold and reduce the probability of wrinkles.

[0016] In some embodiments, the first film layer structure comprises a first adhesive layer, a first PA film, a second adhesive layer, and a second PA film which are sequentially stacked; and the second PA film is arranged on the surface of the second film layer structure.

[0017] In the technical scheme, the first film layer structure comprises a first adhesive layer, a first PA film, a second adhesive layer, and a second PA film which are sequentially stacked, and the second PA film is arranged on the surface of the second film layer structure. The second adhesive layer can bond the two thin PA films together, and the bonded two PA films can provide a certain support force for the first adhesive layer, and the first adhesive layer facilitates the attachment of the adhesive film to the surface of the battery monomer.

[0018] In some embodiments, the thickness of the second PA film is greater than the thickness of the first PA film.

[0019] In the technical scheme, the thickness of the second PA film is greater than the thickness of the first PA film, and the hardness of the second PA film is greater than the hardness of the first PA film, so that the supporting effect of the second PA film is further improved, the overall hardness of the adhesive film is improved, and the puncture resistance is improved.

[0020] In some embodiments, the edges of the same side of the first adhesive layer, the first PA film, the second adhesive layer and the second PA film all protrude from the second film layer structure to form the flange structure.

[0021] In the above embodiment, by setting the edges of the same side of the first adhesive layer, the first PA film, the second adhesive layer and the second PA film all protrude from the second film layer structure to form the flange structure, the thickness of the flange structure of the same side is uniform, the pasted part is more fitted, and the risk of falling is reduced.

[0022] In some embodiments, the second film layer structure comprises a third adhesive layer, a first reinforcing layer, a fourth adhesive layer, a second reinforcing layer, a fifth adhesive layer, a third reinforcing layer and a sixth adhesive layer which are sequentially stacked; wherein the third adhesive layer is attached to the second PA film.

[0023] In the technical scheme, the second film layer comprises a third adhesive layer, a first reinforcing layer, a fourth adhesive layer, a second reinforcing layer, a fifth adhesive layer, a third reinforcing layer and a sixth adhesive layer which are sequentially stacked, so that the adhesive film arranged on the surface of the battery monomer is a multi-layer reinforcing layer structure. Therefore, different reinforcing layers can be selected according to needs, the corrosion resistance, tensile strength, bending strength and impact strength of the adhesive film can be improved, the puncture resistance can be further improved, and the protection of the surface of the battery monomer can be improved.

[0024] In some embodiments, the first reinforcing layer is a polyethylene terephthalate film (PET film), a polypropylene film (PP film) or a polyphenylene sulfide film (PPS film); the second reinforcing layer is a third PA film; the third reinforcing layer is a fourth PA film; wherein the total thickness of the third PA film and the fourth PA film is greater than 30 microns, and the thickness of each is less than or equal to 30 microns.

[0025] In the technical scheme, the PET film, the PP film and the PPS film all have excellent mechanical properties, such as high tensile strength, elongation at break, bending strength and elastic modulus, high wear resistance and impact resistance, and good heat resistance and chemical corrosion resistance. Therefore, using the PET film, the PP film and the PPS film as the reinforcing layer can provide certain supporting force for the adhesive layer, and the adhesive film is not easily damaged during use. The use of the third PA film and the fourth PA film can further improve the ability to resist 0.6mm below iron particles.

[0026] In addition, the total thickness of the third PA film and the fourth PA film is greater than 30 microns, and the thickness of each is less than or equal to 30 microns, so that each layer of PA film can be directly prepared by a biaxial stretching process, so that the second film layer structure has high stiffness and modulus, improves the puncture resistance of the adhesive film, and thus improves the reliability of the battery device.

[0027] In some embodiments, the total thickness of the third PA film and the fourth PA film is greater than or equal to 40 microns and less than or equal to 55 microns; and one of the third PA film and the fourth PA film has a thickness of 30 microns.

[0028] In the above technical solution, by setting the total thickness of the third PA film and the fourth PA film to be greater than or equal to 40 microns and less than or equal to 55 microns, the hardness of the second film layer structure can be improved, and thus the performance of resisting iron particles below 0.6 millimeters (mm) can be improved. In addition, since the total thickness of the two PA films is less than or equal to 55 microns, the thickness of the adhesive film is small, and the spacing between adjacent two battery monomers is small, thereby improving the energy density of the battery device. By setting one of the third PA film and the fourth PA film to have a thickness of 30 microns, the thickness of the other PA film is greater than or equal to 10 microns and less than or equal to 25 microns. Therefore, the thickness of the single-layer PA film is reduced to a certain extent, the stiffness and modulus of the single-layer PA film are improved, the second film layer structure has good resistance to deformation, and the probability of wrinkles in the area of the main structure when the flanging structure is flanged can be further reduced.

[0029] In some embodiments, the battery device further comprises:

[0030] A cooling plate is arranged on one side of the battery monomer.

[0031] The adhesive film is clamped between the cooling plate and the battery monomer.

[0032] In the above technical solution, by arranging the adhesive film between the battery monomer and the cooling plate, the probability of particles between the battery monomer and the cooling plate puncturing the adhesive film arranged on the surface of the battery monomer can be reduced, and thus the probability of insulation failure between the battery monomer and the cooling plate or short circuit of the battery monomer can be reduced.

[0033] To solve the above technical problems, in a second aspect, another technical solution adopted by the present application is to provide an electrical equipment, which comprises a device main body and a battery device provided by any one of the embodiments described above, and the battery device is arranged on the device main body.

[0034] In the technical solution, the first film layer structure includes two polyamide films (PA films) stacked together, the total thickness of the two PA films is greater than 30 microns, and the thickness of each PA film is less than or equal to 30 microns. Therefore, each layer of the PA film can be directly prepared by a two-way stretching process, so that the first film layer structure has high stiffness and modulus, the puncture resistance of the adhesive film is improved, and the reliability of the battery device is improved.

[0035] To solve the above technical problems, in a third aspect, the application provides another technical solution, which is an adhesive film, comprising a first film layer structure and a second film layer structure stacked together; wherein the first film layer structure comprises two polyamide films (PA films) stacked together; the total thickness of the two PA films is greater than 30 microns, and the thickness of each PA film is less than or equal to 30 microns.

[0036] In the technical solution, the first film layer structure includes two polyamide films (PA films) stacked together, the total thickness of the two PA films is greater than 30 microns, and the thickness of each PA film is less than or equal to 30 microns. Therefore, each layer of the PA film can be directly prepared by a two-way stretching process, so that the first film layer structure has high stiffness and modulus, the puncture resistance of the adhesive film is improved, and the reliability of the battery device is improved.

[0037] In some embodiments, at least one edge of the first film layer structure protrudes from the second film layer structure and is suspended to form a flange structure.

[0038] In the technical solution, at least one edge of the first film layer structure protrudes from the second film layer structure and is suspended to form a flange structure. Therefore, the adhesive film and the different parts of the battery cell can be bonded together, and the flange structure will not pull the main thickening layer when the edge area is bent, making it easier to bend the edge area. The probability of wrinkles in the adhesive film during use can be reduced, and the bonding effect of the adhesive film can be improved.

[0039] In some embodiments, the total thickness of the two PA films is greater than or equal to 40 microns and less than or equal to 55 microns.

[0040] In the technical solution, the total thickness of the two PA films is greater than or equal to 40 microns and less than or equal to 55 microns. This can improve the hardness of the first film layer structure, and thus improve the performance of resisting 0.6 millimeter (mm) or smaller iron particles. In addition, since the total thickness of the two PA films is less than or equal to 55 microns, the thickness of the adhesive film is small, and the distance between adjacent two battery cells is small, which improves the energy density of the battery device.

[0041] In some embodiments, one of the two PA films has a thickness of 30 microns.

[0042] In the above technical solution, one of the two PA films is set to have a thickness of 30 microns, and therefore the thickness of the other PA film is greater than or equal to 10 microns and less than or equal to 25 microns. The single-layer PA film with a thickness of 30 microns or less can fully exert the advantages of the biaxial stretching process, thereby improving the stiffness and modulus of the first film layer structure, and further making the flange structure easier to be folded, and reducing the probability of wrinkle problems.

[0043] In some embodiments, the first film layer structure comprises a first adhesive layer, a first PA film, a second adhesive layer, and a second PA film which are sequentially stacked; and the second PA film is arranged on the surface of the second film layer structure.

[0044] In the above technical solution, the first film layer structure comprises a first adhesive layer, a first PA film, a second adhesive layer, and a second PA film which are sequentially stacked, and the second PA film is arranged on the surface of the second film layer structure. The second adhesive layer can bond the two thinner PA films, and the bonded two PA films can provide a certain support force for the first adhesive layer, and the first adhesive layer facilitates the bonding of the adhesive film to the surface of the battery cell.

[0045] In some embodiments, the thickness of the second PA film is greater than the thickness of the first PA film.

[0046] In the above technical solution, the thickness of the second PA film is greater than the thickness of the first PA film, and therefore the hardness of the second PA film is also greater than the hardness of the first PA film, so as to further improve the support effect of the second PA film 316, thereby improving the overall hardness of the adhesive film and improving its puncture resistance.

[0047] In some embodiments, the edges of the same side of the first adhesive layer, the first PA film, the second adhesive layer, and the second PA film all protrude from the second film layer structure to form the flange structure.

[0048] In the above embodiments, the edges of the same side of the first adhesive layer, the first PA film, the second adhesive layer, and the second PA film all protrude from the second film layer structure to form the flange structure, which can make the thickness of the flange structure on the same side uniform, and make the bonded part more conformable, thereby reducing the risk of falling.

[0049] In some embodiments, the second film layer structure comprises a third adhesive layer, a first reinforcing layer, a fourth adhesive layer, a second reinforcing layer, a fifth adhesive layer, a third reinforcing layer, and a sixth adhesive layer which are sequentially stacked; and the third adhesive layer is bonded to the second PA film.

[0050] In the technical solution, the second film layer comprises third adhesive layers, first reinforcing layers, fourth adhesive layers, second reinforcing layers, fifth adhesive layers, third reinforcing layers and sixth adhesive layers which are sequentially stacked, so that the adhesive film arranged on the surface of the battery monomer is a multi-layer reinforcing layer structure. Therefore, different reinforcing layers can be selected according to needs, the corrosion resistance of the adhesive film can be improved, the tensile strength, bending strength and impact strength can be improved, the puncture resistance can be further improved, and the protection of the surface of the battery monomer can be improved.

[0051] In some embodiments, the first reinforcing layer is a polyethylene terephthalate film (PET film), a polypropylene film (PP film) or a polyphenylene sulfide film (PPS film); the second reinforcing layer is a third PA film; and the third reinforcing layer is a fourth PA film. The total thickness of the third PA film and the fourth PA film is greater than 30 microns, and the thickness of each is less than or equal to 30 microns.

[0052] In the technical solution, the PET film, the PP film and the PPS film all have excellent mechanical properties, such as high tensile strength, elongation at break, bending strength and elastic modulus, high wear resistance and impact resistance, and good heat resistance and chemical corrosion resistance. Therefore, the use of the PET film, the PP film and the PPS film as the reinforcing layer can provide certain support for the adhesive layer, and the adhesive film is not easy to be damaged during use. The use of the third PA film and the fourth PA film can further improve the ability to resist iron particles below 0.6 mm.

[0053] In addition, the total thickness of the third PA film and the fourth PA film is greater than 30 microns, and the thickness of each is less than or equal to 30 microns. Therefore, each layer of PA film can be directly prepared by a biaxial stretching process, so that the second film layer structure has high stiffness and modulus, the puncture resistance of the adhesive film is improved, and the reliability of the battery device is improved.

[0054] In some embodiments, the total thickness of the third PA film and the fourth PA film is greater than or equal to 40 microns and less than or equal to 55 microns; and the thickness of one of the third PA film and the fourth PA film is 30 microns.

[0055] In the technical scheme, the third PA film and the fourth PA film have a total thickness greater than or equal to 40 microns and less than or equal to 55 microns, so that the hardness of the second film layer structure can be improved, and the performance of resisting iron particles below 0.6 millimeters (mm) can be improved. In addition, the total thickness of the two PA films is less than or equal to 55 microns, so that the thickness of the adhesive film is small, the spacing between the two adjacent battery monomers is small, and the energy density of the battery device is improved. One of the third PA film and the fourth PA film has a thickness of 30 microns, so that the thickness of the other PA film is greater than or equal to 10 microns and less than or equal to 25 microns. Therefore, the thickness of the single-layer PA film is reduced by a certain range, the stiffness and modulus of the single-layer PA film are improved, the second film layer structure has good resistance to deformation, and the probability of wrinkles in the area of the main structure when the flanging structure is flanged can be further reduced.

[0056] In some embodiments, the adhesive film further comprises:

[0057] a first release layer disposed on a surface of the first film layer structure away from the second film layer structure; and / or

[0058] a second release layer disposed on a surface of the second film layer structure away from the first film layer structure.

[0059] In the technical scheme, the first release layer can be used to protect the first bonding end of the first film layer structure, and / or the second release layer can be used to protect the second bonding end of the second film layer structure, so as to reduce the probability of contamination of the first bonding end and / or the second bonding end. In addition, the convex part of the first release layer and / or the second release layer can be used as a hand pinching part of the user, so as to facilitate the user to tear off the release layer. BRIEF DESCRIPTION OF DRAWINGS

[0060] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0061] Figure 1 is an exploded view of the battery device provided by some embodiments of the present application;

[0062] Figure 2 is a structural schematic view of the battery monomer provided by some embodiments of the present application;

[0063] Figure 3 is a structural schematic view of the adhesive film provided by some embodiments of the present application;

[0064] Figure 4is a structural schematic diagram of a part of the adhesive film in a rolled state provided by some embodiments of the present application;

[0065] Figure 5 is a structural schematic diagram of the adhesive film provided by some other embodiments of the present application;

[0066] Figure 6 is a structural schematic diagram of the battery monomer and the adhesive film provided by some embodiments of the present application;

[0067] Figure 7 is a structural schematic diagram of the adhesive film provided by yet some other embodiments of the present application;

[0068] Figure 8 is a structural schematic diagram of the adhesive film provided by still some other embodiments of the present application;

[0069] Figure 9 is a structural schematic diagram of the battery monomer, the cooling plate and the adhesive film provided by some other embodiments of the present application;

[0070] Figure 10 is a structural schematic diagram of the vehicle provided by the embodiments of the present application.

[0071] Explanation of reference signs:

[0072] 100-battery device, 10-battery box, 11-first part, 12-second part, 20-battery monomer, 21-first surface, 22-second surface, 23-housing, 24-electrode assembly, 30-adhesive film, 31-first film layer structure, 310-flange structure, 311-first bonding end, 312-main body structure, 313-first adhesive layer, 314-first PA film, 315-second adhesive layer, 316-second PA film, 32-second film layer structure, 321-second bonding end, 322-third adhesive layer, 323-first reinforcing layer, 324-fourth adhesive layer, 325-second reinforcing layer, 326-fifth adhesive layer, 327-third reinforcing layer, 328-sixth adhesive layer, 40-first release layer, 50-second release layer, 90-cooling plate, 1000-vehicle, 200-controller, 300-motor. DETAILED DESCRIPTION

[0073] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0074] 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 belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the description and claims of this application as well as the above discussion of the background of the application and the above description of the state of the art, may contain

[0075] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all directed to the same embodiments, or alternative embodiments.

[0076] In the description of the embodiments of the present application, the technical terms "first", "second", "third" and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more (including two), for example, two, three, etc., unless otherwise explicitly specified, and the same applies to "a plurality of groups" and "a plurality of pieces".

[0077] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents a "or" relationship between the front and rear associated objects.

[0078] In the description of the embodiments of the present application, the orientations or positional relationships indicated by 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", "circumferential" and the like are the relative orientations or positional relationships between components in a certain attitude (as shown in the drawings) based on the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0079] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0080] In the present application, the battery cell can include a lithium ion battery cell, a sodium ion battery cell or a magnesium ion battery cell, etc., and the battery cell can be in the shape of a cylinder, a flat body or other shapes, etc. The battery cell is generally divided into three types according to the packaging method: cylindrical battery cell, square battery cell and soft package battery cell. The following embodiments take square lithium ion battery as an example for illustration.

[0081] During the production, transportation and installation of the battery cell in the battery box of the battery device, a film is generally used for bonding to play a buffering protection role when the battery is subjected to external force, so as to reduce the probability of damage to the battery and improve the production yield of the battery. For example, the battery device includes battery cells, cooling plates and some metal parts, which are all located in the battery box, wherein the outer surface of the battery cell and / or the outer surface of the cooling plate can be protected by the insulating protection of the film.

[0082] During the production and use of the battery, the control of particles is crucial. For example, during the processing and transportation of the battery monomer, some particles will fall into the battery box, and / or the metal parts located in the battery box may carry some particles, so that the particles can move freely in the battery box. If the particles fall between the cooling plate and the battery monomer, when the battery monomer expands, the particles between the battery monomer and the cooling plate can pierce the adhesive film covering the surface of the battery monomer or the cooling plate, causing the insulation between the battery monomer and the cooling plate to fail or the battery monomer to short circuit, causing the battery performance to decline, and even causing safety hazards such as overheating and thermal runaway.

[0083] The adhesive film currently used generally includes a polyamide film (PA film) and a polyethylene terephthalate film (PET film) stacked, and the PA film and the PET film are combined by an adhesive layer. In order to improve the puncture resistance of the adhesive film, in the related art, the thickness of the PA film is set to be greater than 30 microns. However, for a single-layer PA film, it is difficult to directly prepare a BOPA film (Biaxially Oriented Polyamide Film) with a thickness greater than 30 microns by using a two-way stretching process, or the cost of directly preparing a BOPA film with a thickness greater than 30 microns by using a two-way stretching process is too high. In order to prepare a PA film with a thickness greater than 30 microns, a multi-layer co-extrusion technology needs to be used. However, the PA film produced by multi-layer co-extrusion has a soft texture, resulting in poor puncture resistance of the adhesive film.

[0084] To solve the above problems, the embodiments of the present application provide a battery device, which comprises a battery box, a plurality of battery monomers and an adhesive film, the plurality of battery monomers are contained in the battery box, the battery monomer comprises a shell and an electrode assembly contained in the shell; the adhesive film is attached to a first surface of the battery monomer; the adhesive film comprises a first film layer structure and a second film layer structure stacked; wherein the first film layer structure comprises two polyamide films (PA films) stacked; the total thickness of the two PA films is greater than 30 microns, and the thickness of each PA film is less than or equal to 30 microns.

[0085] In the present embodiment, by setting the first film layer structure to comprise two polyamide films (PA films) stacked, the total thickness of the two PA films is greater than 30 microns, and the thickness of each PA film is less than or equal to 30 microns, therefore, each layer of PA film can be directly prepared by using a two-way stretching process, so that the first film layer structure has a higher stiffness and modulus, improving the puncture resistance of the adhesive film, thereby improving the reliability of the battery device.

[0086] The present application will be described in detail below in conjunction with the drawings and embodiments.

[0087] Please refer to Figures 1-3 , wherein,Figure 1 is an exploded view of a battery device 100 provided by some embodiments of the present application; Figure 2 is a structural schematic view of a battery cell 20 provided by some embodiments of the present application; Figure 3 is a structural schematic view of a film 30 provided by some embodiments of the present application.

[0088] The battery device 100 provided by the present application comprises a battery box 10, a plurality of battery cells 20 and a film 30. The plurality of battery cells 20 are accommodated in the battery box 10, and each battery cell 20 comprises a shell 23 and an electrode assembly 24 accommodated in the shell 23. The film 30 is attached to a first surface 21 of the battery cell 20, and the film 30 comprises a first film layer structure 31 and a second film layer structure 32 stacked together; the first film layer structure 31 comprises two polyamide films (PA films) stacked together, and the total thickness of the two PA films is greater than 30 microns, and the thickness of each PA film is less than or equal to 30 microns.

[0089] The battery box 10 is used to provide an accommodation space for the battery cell 20, and the battery box 10 can adopt various structures. In some embodiments, the battery box 10 can comprise a first part 11 and a second part 12, the first part 11 and the second part 12 are overlapped with each other, and the first part 11 and the second part 12 together define an accommodation space for accommodating the battery cell 20. The second part 12 can be a hollow structure with one end open, and the first part 11 can be a plate-shaped structure, which is overlapped with the open side of the second part 12 to make the first part 11 and the second part 12 together define the accommodation space; the first part 11 and the second part 12 can also be hollow structures with one side open, and the open side of the first part 11 is overlapped with the open side of the second part 12. Of course, the battery box 10 formed by the first part 11 and the second part 12 can have various shapes, such as a cylinder, a cuboid, etc.

[0090] In the battery device 100, the battery cells 20 can be multiple, and the multiple battery cells 20 can be connected in series, in parallel or in a mixed manner. The mixed manner means that the multiple battery cells 20 are connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel or in a mixed manner, and then the whole of the multiple battery cells 20 is accommodated in the battery box 10; of course, the battery device 100 can also be that the multiple battery cells 20 are first connected in series, in parallel or in a mixed manner to form a battery module, and then multiple battery modules are connected in series, in parallel or in a mixed manner to form a whole, which is accommodated in the battery box 10. The battery device 100 can also comprise other structures, for example, the battery device 100 can also comprise a current collecting component for realizing the electrical connection between the multiple battery cells 20.

[0091] Each battery cell 20 can be a secondary battery or a primary battery, and can be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes.

[0092] The battery cell 20 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is usually arranged between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have portions with active materials, which constitute a main body of the battery cell 20, and portions without active materials, which constitute tabs, respectively. The positive electrode tabs and the negative electrode tabs can be located at one end of the main body or at two ends of the main body, respectively. In the charging and discharging process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs are connected to the electrode terminals to form a current loop.

[0093] The battery cell 20 refers to the smallest unit that constitutes a battery. For example, Figure 2 In some embodiments, the battery cell 20 includes an end cover, a shell 23, an electrode assembly 24, and other functional components.

[0094] The shell 23 refers to a component that wraps the battery cell 20 to form an internal environment of the battery cell 20, and the internal environment formed can be used to accommodate the electrode assembly 24, the electrolyte, and other components. The shell 23 can be used in combination with the end cover. Specifically, in some embodiments, an opening can be provided on the shell 23, and the end cover is used to cover the opening to form the internal environment of the battery cell 20. In other embodiments, the end cover and the shell 23 can be integrated. Specifically, the end cover and the shell 23 can form a common connection surface before other components enter the shell, and the end cover is used to cover the shell 23 when it is necessary to seal the internal environment of the shell 23. The shell 23 can be in various shapes and sizes, such as a cuboid, a cylinder, a hexagonal prism, and the like. Specifically, the shape of the shell 23 can be determined according to the specific shape and size of the electrode assembly 24. The material of the shell 23 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, and the like, and the embodiments of the present application do not make special limitations thereon.

[0095] The electrode assembly 24 is a component in which electrochemical reactions occur in the battery cell 20. One or more electrode assemblies 24 can be contained in the shell 23. The electrode assembly 24 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is usually arranged between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have portions with active materials, which constitute a main body of the electrode assembly, and portions without active materials, which constitute tabs, respectively. The positive electrode tabs and the negative electrode tabs can be located at one end of the main body or at two ends of the main body, respectively. In the charging and discharging process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs are connected to the electrode terminals to form a current loop.

[0096] The first surface 21 of the battery monomer 20 to which the adhesive film 30 is attached can refer to the outer surface of the shell 23 or the outer surface of the electrode assembly 24. The first film layer structure 31 and the second film layer structure 32 can be fixedly connected by the adhesive layer. Please refer to Figure 3 The first film layer structure 31 provided by the present application includes two polyamide films (PA films) stacked, i.e., a first PA film 314 and a second PA film 316; the first PA film 314 and the second PA film 316 can be fixedly connected by a second adhesive layer 315. The surface of the first PA film 314 away from the second PA film 316 can also be provided with a first adhesive layer 313 for bonding and fixing with the first surface 21 of the battery monomer 20. The second film layer structure 32 can include a polyethylene terephthalate film (PET film), a polypropylene film (PP film), or a polyphenylene sulfide film (PPS film).

[0097] In the present application, the first film layer structure 31 includes two PA films with a thickness less than or equal to 30 microns, and the total thickness of the PA films is greater than 30 microns. Each layer of PA film can be directly prepared by a biaxial stretching process, so that the first film layer structure 31 has a higher stiffness and modulus, improves the puncture resistance of the adhesive film 30, and thus improves the reliability of the battery device 100.

[0098] In some embodiments, the adhesive film 30 is transported and stored in a rolled manner, as shown in Figure 4 Figure 4 is a structure schematic diagram of part of the adhesive film 30 in a rolled state provided by some embodiments of the present application. In actual use, the winding direction (winding and unwinding direction) of the adhesive film 30 is the length direction X, the direction intersecting the length direction X is the width direction Y, and the thickness direction Z is perpendicular to both the length direction X and the width direction Y.

[0099] Please refer to Figure 5 In some embodiments, at least one edge of the first film layer structure 31 protrudes from the second film layer structure 32 and is suspended to form a flange structure 310, which is attached to the second surface 22 of the battery monomer 20 after being bent.

[0100] Please refer to Figure 2 In some embodiments, the adhesive film 30 is arranged on one side of the shell 23 of the battery monomer 20, and the flange structure 310 of the adhesive film 30 is attached to the other side of the shell 23 of the battery monomer 20 after being bent.

[0101] Please refer to Figure 6 ​In some embodiments, the adhesive film 30 is arranged on the side (large surface in the thickness direction) of the shell 23 of the battery cell 20, and the folded edge structure 310 of the adhesive film 30 is folded and attached to the outer surface of the bottom wall of the shell 23 of the battery cell 20.

[0102] Please continue to see Figure 5 In some embodiments, the first film layer structure 31 is arranged on one end of the second film layer structure 32 in the thickness direction Z of the adhesive film 30, and the end of the second film layer structure 32 away from the first film layer structure 31 in the thickness direction Z of the adhesive film 30 is configured as a second bonding end 321. At least one edge of the first film layer structure 31 protrudes from the second film layer structure 32 and is arranged in a suspended manner to form a folded edge structure 310. The folded edge structure 310 is folded and attached to the second surface of the battery cell 20, for example, the folded edge structure 310 of the adhesive film 30 is attached to the outer surface of the bottom wall of the shell 23 of the battery cell 20. The folded edge structure 310 can be located at one end, two opposite ends, two adjacent ends, three adjacent ends, or four ends of the first film layer structure 31 in the width direction Y perpendicular to the thickness direction Z of the adhesive film 30. The embodiments of the present application take the folded edge structure 310 located at one end of the first film layer structure 31 in the width direction Y as an example for introduction. The folded edge structure 310 is arranged protrudingly in the width direction Y relative to the second film layer structure 32. At least one end of the folded edge structure 310 in the thickness direction Z is configured as a first bonding end 311. The first bonding end 311 can be the surface of the folded edge structure 310 away from the second film layer structure 32, or the surface of the folded edge structure 310 close to the second film layer structure 32, or the layer where the folded edge structure 310 is located has adhesion, serving as the first bonding end 311.

[0103] The first film layer structure 31 is arranged on the side of the second film layer structure 32 where no adhesive layer is arranged in the thickness direction Z. In the width direction Y, the first film layer structure 31 can be divided into a main body structure 312 and a folded edge structure 310. In the thickness direction Z, the orthographic projection of the main body structure 312 can fall within the orthographic projection range of the second film layer structure 32, or the orthographic projection of the second film layer structure 32 can fall within the orthographic projection range of the main body structure 312. The folded edge structure 310 of the first film layer structure 31 can be arranged protrudingly relative to the second film layer structure 32. In other words, in the orthographic projection in the thickness direction Z, the folded edge structure 310 is the part where the first film layer structure 31 and the second film layer structure 32 do not overlap. The first film layer structure 31 can form one folded edge structure 310 protruding relative to the second film layer structure 32, or can form two folded edge structures 310.

[0104] The folded edge structure 310 can be folded relative to the second film layer structure 32 under the action of an external force to be bonded to the second film layer structure 32 on two intersecting surfaces of the battery cell 20, so as to bond the entire adhesive film 30 to the battery cell 20.

[0105] The first adhesive end 311 can be located only at the flange structure 310, or can extend from the flange structure 310 to other parts of the first film layer structure 31. For example, in the thickness direction Z, the surface of the first film layer structure 31 away from the second film layer structure 32 has adhesion, and this surface can form the first adhesive end 311 entirely, or only the flange structure 310 of the surface of the first film layer structure 31 away from the second film layer structure 32 has adhesion, and the flange structure 310 forms the first adhesive end 311.

[0106] The second film layer structure 32 is used to increase the thickness of the adhesive film 30 to improve the overall rigidity of the adhesive film 30. The second film layer structure 32 can be a multi-film layer structure in the thickness direction Z. The second film layer structure 32 can also bond part of the adhesive film 30 to the surface of the battery monomer 20.

[0107] In the above embodiment, by providing the adhesive film 30 including the first film layer structure 31 and the second film layer structure 32 arranged in layers, at least one edge of the first film layer structure 31 protrudes from the second film layer structure 32, and the flange structure 310 is suspended and arranged. After the flange structure 310 is bent and attached to the second surface of the battery monomer 20, the adhesive film 30 and different parts of the battery monomer 20 can be bonded together, thereby reducing the probability of the adhesive film 30 being warped during use. The flange structure 310 does not pull the main thickening layer when the edge area is bent, and the edge area is easier to bend, which can reduce the probability of the adhesive film 30 being warped during use, thereby improving the bonding effect of the adhesive film 30.

[0108] In the present embodiment, the flange structure 310 includes two PA films with a thickness less than or equal to 30 microns, and the total thickness of the PA films is greater than 30 microns. Each layer of PA film can be directly prepared by a biaxial stretching process, so that the flange structure 310 has high stiffness and modulus, is easy to fold during fitting, and is not prone to wrinkling or warping after fitting, thereby improving the reliability of the battery device 100.

[0109] Experiments show that when a PA film with a thickness greater than 30 microns prepared by a multi-layer co-extrusion technology is used as the first film layer structure 31, the flange structure 310 formed by the first film layer structure 31 is too soft, which is not easy to fold during fitting and is prone to wrinkling or warping after fitting, resulting in failure of insulation protection and affecting the reliability of the battery device.

[0110] Further, in some embodiments, the total thickness of the two PA films is greater than or equal to 40 microns and less than or equal to 55 microns. For example, the total thickness of the two PA films can be 40 microns, 42 microns, 45 microns, 48 microns, 50 microns, 52 microns, or 55 microns, etc., which can improve the hardness of the first film layer structure 31, and in turn can improve the performance of resisting iron particles below 0.6 millimeters (mm). In addition, since the total thickness of the two PA films is less than or equal to 55 microns, the thickness of the adhesive film 30 is small, the spacing between two adjacent battery monomers 20 is small, and the energy density of the battery device 100 is improved. In some embodiments of the present application, the total thickness of the two PA films is 45 microns.

[0111] Further, in some embodiments, one of the two PA films has a thickness of 30 microns. Therefore, the thickness of the other PA film is greater than or equal to 10 microns and less than or equal to 25 microns, for example, it can be 10 microns, 12 microns, 15 microns, 18 microns, 20 microns, 22 microns, or 25 microns, etc. Therefore, the single-layer PA film with a thickness of 30 microns or less can fully exert the advantages of the biaxial stretching process, improve the stiffness and modulus of the first film layer structure 31, and in turn make the flanging structure 310 more easily folded, reducing the probability of wrinkles.

[0112] In some embodiments, please continue to refer to Figure 5 The first film layer structure 31 includes a first adhesive layer 313, a first PA film 314, a second adhesive layer 315, and a second PA film 316 arranged in sequence. The second PA film 316 is arranged on the surface of the second film layer structure 32.

[0113] Optionally, the first adhesive layer 313 and the second adhesive layer 315 can be thin films formed by coating adhesive. The materials of the two can be the same or different, and the thicknesses of the two can be adjusted by the amount of adhesive coated, and can be the same or different. Specifically, it can be adjusted as needed.

[0114] In some embodiments, in the thickness direction Z, the projection of the first adhesive layer 313, the projection of the first PA film 314, the projection of the second adhesive layer 315, and the projection of the second PA film 316 are substantially consistent. The hardness of the first PA film 314 and the second PA film 316 is greater than the hardness of the first adhesive layer 313 and the second adhesive layer 315. The detection standard of hardness involved in all embodiments of the present application can refer to the hardness reference table.

[0115] In the above embodiment, the turn-up structure 310 is provided as a multi-layer film structure including a first adhesive layer 313, a first PA film 314, a second adhesive layer 315, and a second PA film 316. The second adhesive layer 315 can bond the two thinner PA films together, and the two bonded PA films can provide a certain support force for the first adhesive layer 313, which facilitates the bonding of the adhesive film 30 to the surface of the battery monomer 20.

[0116] Further, in some embodiments, the thickness of the second PA film 316 is greater than the thickness of the first PA film 314. The thickness of the second PA film 316 is greater than the thickness of the first PA film 314, and therefore the hardness of the second PA film 316 is also greater than the hardness of the first PA film 314, to further improve the supporting effect of the second PA film 316, thereby improving the overall hardness of the adhesive film 30 and its puncture resistance.

[0117] Optionally, in some embodiments, the edges of the same side of the first adhesive layer 313, the first PA film 314, the second adhesive layer 315, and the second PA film 316 all protrude from the second film layer structure 32 to form the turn-up structure 310. Optionally, in some embodiments, the edges of the same side of the first adhesive layer 313, the first PA film 314, the second adhesive layer 315, and the second PA film 316 are flush. Optionally, in some embodiments, the edges of the opposite sides of the first adhesive layer 313, the first PA film 314, the second adhesive layer 315, and the second PA film 316 all protrude to form two turn-up structures 310, which can be folded to be attached to different parts.

[0118] In the above embodiment, by providing the edges of the same side of the first adhesive layer, the first PA film, the second adhesive layer, and the second PA film to protrude from the second film layer structure 32 to form the turn-up structure 310, the thickness of the turn-up structure 310 on the same side can be uniform, making the attached part more conformable and reducing the risk of falling off.

[0119] The second film layer structure 32 can be a single-layer film structure, and the surface of the second film layer structure 32 away from the first film layer structure 31 has adhesion, which is the second adhesive end 321. Alternatively, the second film layer structure 32 can also be a multi-layer film structure including one or more adhesive layers and one or more reinforcing layers. The adhesive layer can be a thin film formed by coating an adhesive, and the reinforcing layer can be made of high-crystallinity polyethylene terephthalate (PET), polyamide film (PA), polypropylene (PP), or polyphenylene sulfide (PPS), etc. The material used can be made of thermoplastic materials according to the actual hardness, etc., to provide support for the adhesive layer and have a certain stiffness and modulus, making the turn-up structure easy to fold and reducing the probability of wrinkles.

[0120] In some embodiments, referring to Figure 7 The second film layer structure 32 comprises, in sequence, a third adhesive layer 322, a first reinforcing layer 323, a fourth adhesive layer 324, a second reinforcing layer 325, a fifth adhesive layer 326, a third reinforcing layer 327, and a sixth adhesive layer 328; the third adhesive layer 322 is attached to the second PA film 316, and the sixth adhesive layer 328 is the second bonding end 321. In this way, the adhesive film 30 arranged on the surface of the battery monomer 20 is a multi-layer reinforcing layer structure, so that different reinforcing layers can be selected according to needs, the corrosion resistance of the adhesive film 30 can be improved, the tensile strength, bending strength, and impact strength can be improved, and the puncture resistance can be further improved, and the protection of the surface of the battery monomer 20 can be improved.

[0121] Further, the materials of the first reinforcing layer 323, the second reinforcing layer 325, and the third reinforcing layer 327 can be the same or different. In some embodiments, the first reinforcing layer 323 is a PET film, a PP film, or a PPS film; the second reinforcing layer 325 is a third PA film, and the third reinforcing layer 327 is a fourth PA film. The PET film, the PP film, and the PPS film all have excellent mechanical properties, such as high tensile strength, elongation at break, bending strength, and elastic modulus, high wear resistance and impact resistance, and good heat resistance and chemical corrosion resistance. Therefore, using the PET film, the PP film, and the PPS film as the reinforcing layer can provide certain support for the adhesive layer, and the adhesive film 30 is not easy to be damaged during use. The use of the third PA film and the fourth PA film can further improve the ability to resist 0.6mm below iron particles.

[0122] In addition, the total thickness of the third PA film and the fourth PA film is greater than 30 microns, and the thickness of each is less than or equal to 30 microns. Therefore, the PA film of each layer can be directly prepared by a biaxial stretching process, so that the second film layer structure 32 has high stiffness and modulus, the puncture resistance of the adhesive film 30 is improved, and the reliability of the battery device 100 is improved.

[0123] In some embodiments, the total thickness of the third PA film and the fourth PA film is greater than or equal to 40 microns and less than or equal to 55 microns, for example, the total thickness of the two PA films can be 40 microns, 42 microns, 45 microns, 48 microns, 50 microns, 52 microns, or 55 microns, etc., which can improve the hardness of the second film layer structure 32, and further improve the performance of resisting iron particles below 0.6 mm. Alternatively, in some embodiments, one of the third PA film and the fourth PA film has a thickness of 30 microns, and therefore, the thickness of the other PA film is greater than or equal to 10 microns and less than or equal to 25 microns, for example, it can be 10 microns, 12 microns, 15 microns, 18 microns, 20 microns, 22 microns, or 25 microns, etc. Therefore, the thickness of the single-layer PA film is reduced within a certain range, which improves the stiffness and modulus of the single-layer PA film, and enables the second film layer structure 32 to have better resistance to deformation, thereby further reducing the probability of wrinkles in the area of the main body structure 312 when the flanging structure 310 is flanged.

[0124] Referring to Figure 8 , the adhesive film further comprises a first release layer 40 and / or a second release layer 50, wherein the first release layer 40 is arranged on the surface of the first film layer structure 31 away from the second film layer structure 32; and the second release layer 50 is arranged on the surface of the second film layer structure 32 away from the first film layer structure 31.

[0125] When the adhesive film 30 is wound, the winding direction of the adhesive film 30 can be determined according to the arrangement position of the first release layer 40 and / or the second release layer 50, thereby facilitating the winding of the adhesive film 30. In some embodiments, the first release layer 40 is arranged protruding along the width direction of the first film layer structure 31 compared to the first film layer structure 31; and / or the second release layer 50 is arranged protruding along the width direction of the second film layer structure 32 compared to the second film layer structure 32.

[0126] The first release layer 40 can be used to protect the second bonding end 321 of the first film layer structure 31, and / or the second release layer 50 can be used to protect the first bonding end 311 of the second film layer structure 32, thereby reducing the probability of contamination of the second bonding end 321 and / or the first bonding end 311. Moreover, the protruding part of the first release layer 40 and / or the second release layer 50 can be used as a hand pinch part for the user, thereby facilitating the user to tear off the release layer.

[0127] Referring to Figure 9 , in some embodiments, the battery device 100 further comprises a cooling plate 90 arranged on one side of the battery monomer 20. The adhesive film 30 is arranged between the battery monomer 20 and the cooling plate 90.

[0128] Specifically, the cooling plate 90 is arranged on the surface side of the battery monomer 20 in the thickness direction; the adhesive film 30 is used to bond and fix the battery monomer 20 and the cooling plate 90; and the flange structure 310 of the adhesive film 30 is attached to the outer surface of the bottom wall of the shell 23 of the battery monomer 20.

[0129] In the embodiment, by arranging the adhesive film 30 between the battery monomer 20 and the cooling plate 90, the probability of the particles between the battery monomer 20 and the cooling plate 90 piercing the adhesive film 30 arranged on the surface of the battery monomer 20 can be reduced, and the probability of insulation failure between the battery monomer 20 and the cooling plate 90 or short circuit of the battery monomer 20 can be reduced.

[0130] The battery described in the embodiments of the present application is suitable for use in an electrical device. The battery device disclosed in the embodiments of the present application can be used in an electrical device using a battery as a power source or a variety of energy storage systems using a battery as an energy storage element. The electrical device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, and the like. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, and an electric aircraft toy, and the like, and the spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

[0131] The following embodiments are described for convenience with a vehicle 1000 as an example of an electrical device in an embodiment of the present application.

[0132] Please refer to Figure 10 , Figure 10 is a structural schematic diagram of the vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel car, a gas car, or a new energy car, and the new energy car can be a pure electric car, a hybrid car, or a range extended car, etc. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, head, or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle 1000 during starting, navigation, and driving.

[0133] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0134] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other manners. For example, the division of the units is only a logical function division, and there can be another division manner for the actual implementation, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections between the units can be indirect couplings or communication connections through some interfaces, devices or units, and can be in electrical, mechanical or other forms.

[0135] In addition, each function unit in the various embodiments of the present application can be integrated into a processing unit, or each unit can exist alone physically, or two or more units can be integrated into one unit. The integrated unit can be implemented in the form of hardware, or in the form of a software function unit.

[0136] The above descriptions are only some embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent flow transformation using the content of the present application specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A battery device, characterized by, The battery device comprises: a battery box; a plurality of battery cells accommodated in the battery box; the battery cell comprises a shell and an electrode assembly accommodated in the shell; a film is attached to a first surface of the battery cell; the film comprises a first film layer structure and a second film layer structure which are stacked; wherein the first film layer structure comprises two polyamide films which are stacked; the total thickness of the two polyamide films is greater than 30 microns, and the thickness of each polyamide film is less than or equal to 30 microns.

2. The battery device according to claim 1, wherein at least one edge of the first film layer structure protrudes from the second film layer structure and is suspended to form a flange structure; the flange structure is bent and attached to a second surface of the battery cell.

3. The battery device according to claim 2, wherein the total thickness of the two polyamide films is greater than or equal to 40 microns and less than or equal to 55 microns.

4. The battery device according to claim 3, wherein one of the two polyamide films has a thickness of 30 microns.

5. The battery device according to claim 2, wherein the first film layer structure comprises a first adhesive layer, a first polyamide film, a second adhesive layer and a second polyamide film which are sequentially stacked; and the second polyamide film is arranged on the surface of the second film layer structure.

6. The battery device according to claim 5, wherein the thickness of the second polyamide film is greater than the thickness of the first polyamide film.

7. The battery device according to claim 5, wherein the edges of the same side of the first adhesive layer, the first polyamide film, the second adhesive layer and the second polyamide film all protrude from the second film layer structure to form the flange structure.

8. The battery device according to any one of claims 5-7, wherein the second film layer structure comprises a third adhesive layer, a first reinforcing layer, a fourth adhesive layer, a second reinforcing layer, a fifth adhesive layer, a third reinforcing layer and a sixth adhesive layer which are sequentially stacked; and the third adhesive layer is attached to the second polyamide film.

9. The battery device according to claim 8, wherein the first reinforcing layer is a polyethylene terephthalate film, a polypropylene film or a polyphenylene sulfide film; the second reinforcing layer is a third polyamide film; and the third reinforcing layer is a fourth polyamide film; wherein the total thickness of the third polyamide film and the fourth polyamide film is greater than 30 microns, and the thickness of each is less than or equal to 30 microns.

10. The battery device according to claim 9, wherein the total thickness of the third polyamide film and the fourth polyamide film is greater than or equal to 40 microns and less than or equal to 55 microns; and one of the third polyamide film and the fourth polyamide film has a thickness of 30 microns.

11. The battery device according to any one of claims 1 to 7, wherein Further comprising: a cooling plate arranged on one side of the battery cell; the film is clamped between the cooling plate and the battery cell.

12. An electrical device, characterized by The battery device comprises: a device main body; and the battery device according to any one of claims 1-11 is arranged in the device main body.

13. An adhesive film, characterized by The adhesive film comprises a first film layer structure and a second film layer structure which are stacked; wherein the first film layer structure comprises two polyamide films which are stacked; the total thickness of the two polyamide films is greater than 30 microns, and the thickness of each polyamide film is less than or equal to 30 microns.

14. The adhesive film according to claim 13, wherein, At least one edge of the first film layer structure protrudes from the second film layer structure and is suspended to form a flange structure.

15. The adhesive film according to claim 14, wherein, The total thickness of the two polyamide films is greater than or equal to 40 microns and less than or equal to 55 microns.

16. The adhesive film according to claim 15, wherein, One of the two polyamide films has a thickness of 30 microns.

17. The adhesive film according to claim 14, wherein, The first film layer structure comprises a first adhesive layer, a first polyamide film, a second adhesive layer, and a second polyamide film which are stacked in sequence; wherein the second polyamide film is arranged on the surface of the second film layer structure.

18. The adhesive film according to claim 17, wherein, The thickness of the second polyamide film is greater than the thickness of the first polyamide film.

19. The adhesive film according to claim 17, wherein, The edges of the same side of the first adhesive layer, the first polyamide film, the second adhesive layer, and the second polyamide film all protrude from the second film layer structure to form the flange structure.

20. The adhesive film according to any one of claims 17-19, wherein, The second film layer structure comprises a third adhesive layer, a first reinforcing layer, a fourth adhesive layer, a second reinforcing layer, a fifth adhesive layer, a third reinforcing layer, and a sixth adhesive layer which are stacked in sequence; wherein the third adhesive layer is attached to the second polyamide film.

21. The adhesive film according to claim 20, wherein, The first reinforcing layer is a polyethylene terephthalate film, a polypropylene film, or a polyphenylene sulfide film; the second reinforcing layer is a third polyamide film; the third reinforcing layer is a fourth polyamide film; wherein the total thickness of the third polyamide film and the fourth polyamide film is greater than 30 microns, and the thickness of each is less than or equal to 30 microns.

22. The adhesive film according to claim 21, wherein, The total thickness of the third polyamide film and the fourth polyamide film is greater than or equal to 40 microns and less than or equal to 55 microns; one of the third polyamide film and the fourth polyamide film has a thickness of 30 microns.

23. The film of claim 20, wherein The adhesive film further comprises: a first release layer arranged on the surface of the first film layer structure away from the second film layer structure; and / or a second release layer arranged on the surface of the second film layer structure away from the first film layer structure.

Images