Packaging film, battery, battery device and electric equipment

Abstract

The utility model provides a packaging film, a battery, a battery device and electric equipment, and belongs to the technical field of packaging. The encapsulation film includes: an insulating protective layer; an insulating heat sealing layer; the metal layer is located between the insulation protection layer and the insulation heat sealing layer; the first detection layer is located on the side, close to the metal layer, of the insulating heat sealing layer, and the first detection layer is configured to generate visible change when making contact with an organic solvent.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of packaging, in particular to a packaging film, a battery, a battery device and an electrical equipment. BACKGROUND

[0002] The packaging film is a structure for protecting and packaging various electronic components, circuit boards and the like. The packaging film can be used in the field of batteries, but is not limited thereto. For example, the packaging film can be used to package electrode assemblies and protect the electrode assemblies inside the packaging film from damage.

[0003] The packaging film generally comprises an insulating protective layer, an insulating heat-sealing layer and a metal layer between the insulating protective layer and the insulating heat-sealing layer. The insulating protective layer and the metal layer serve to enhance the strength of the packaging film, and the insulating heat-sealing layer serves to enhance the sealing performance of the packaging film.

[0004] In order to ensure the packaging effect of the packaging film in use, it is necessary to detect the packaging film to determine whether it is damaged. However, the packaging film cannot be conveniently and quickly detected at present. UTILITY MODEL CONTENT

[0005] The present application aims to solve at least one of the technical problems in the background art. To this end, one object of the present application is to provide a packaging film, a battery, a battery device and an electrical equipment, which solves the problem that the packaging film cannot be conveniently and quickly detected in the related art.

[0006] An embodiment of the first aspect of the present application provides a packaging film, comprising: an insulating protective layer; an insulating heat-sealing layer; a metal layer between the insulating protective layer and the insulating heat-sealing layer; a first detection layer on a side of the insulating heat-sealing layer close to the metal layer, the first detection layer being configured to undergo a visible change when in contact with an organic solvent.

[0007] In the technical solution of the embodiment of the present application, in the case of damage to the insulating heat-sealing layer, the position of the damaged insulating heat-sealing layer can expose the first detection layer. In the case of contact between the surface of the insulating heat-sealing layer and the organic solvent, the first detection layer exposed by the damaged insulating heat-sealing layer can be in contact with the organic solvent and undergo a visible change. Thus, whether the insulating heat-sealing layer is damaged can be observed by the naked eye, and the packaging film can be conveniently and quickly detected.

[0008] In some embodiments, the first detection layer is configured to emit light or change color when in contact with the organic solvent. The light emission or color change can be more obviously perceived by the naked eye, thereby improving the accuracy of detecting whether the insulating heat-sealing layer is damaged.

[0009] In some embodiments, the first detection layer is bonded to the surface of the insulating heat-sealing layer close to the metal layer. In this way, the first detection layer can be firmly attached to the surface of the insulating heat-sealing layer close to the metal layer, so that the insulating heat-sealing layer exposes the first detection layer immediately when it is damaged, improving the reaction efficiency of the first detection layer with the organic solvent, and further improving the detection efficiency of the packaging film.

[0010] In some embodiments, the first detection layer has adhesion. The first detection layer can be attached to the surface of the insulating heat-sealing layer away from the metal layer using its own adhesion, so that the first detection layer is in close contact with the insulating heat-sealing layer, and the first detection layer is exposed immediately when the insulating heat-sealing layer is damaged, shortening the reaction time of the organic solvent with the detection layer, further improving the detection efficiency of the packaging film, while also maintaining a small overall thickness of the packaging film.

[0011] In some embodiments, the packaging film further comprises a first adhesive layer located on the side of the first detection layer close to the insulating heat-sealing layer, for bonding the first detection layer to the surface of the insulating heat-sealing layer close to the metal layer. In this way, even if the first detection layer has no adhesion, it can be firmly attached to the surface of the insulating heat-sealing layer close to the metal layer, thereby expanding the material selection range of the first detection layer and simplifying the preparation of the detection layer.

[0012] In some embodiments, the thickness ratio of the insulating heat-sealing layer to the first detection layer is 0.01-0.17. Within this thickness ratio range, the thickness of the first detection layer is large enough to improve the reliability of the visible change of the first detection layer with the organic solvent. In addition, the thickness of the first detection layer is smaller than that of the insulating heat-sealing layer, so that the presence of the first detection layer does not cause the thickness of the packaging film to increase too much, to some extent avoiding the problem of increased difficulty in deformation of the packaging film due to the excessive thickness of the packaging film, and achieving a good packaging effect on the object to be packaged.

[0013] In some embodiments, the thickness of the first detection layer is 1-5 μm. Within this thickness range, the first detection layer can undergo a visible change with the organic solvent, and the overall thickness of the packaging film does not increase too much, so that the packaging film can have a good packaging effect.

[0014] In some embodiments, the packaging film further comprises a second detection layer located on the side of the insulating protective layer close to the metal layer, and the second detection layer is configured to undergo a visible change when in contact with the organic solvent. In this way, when the insulating protective layer is damaged, the damaged part of the insulating protective layer exposes the second detection layer, and when the surface of the insulating protective layer is in contact with the organic solvent, the second detection layer exposed by the damaged part of the insulating protective layer can be in contact with the organic solvent and undergo a visible change, so that whether the insulating protective layer is damaged can be observed by the naked eye.

[0015] In some embodiments, the second detection layer is configured to emit light or change color when in contact with the organic solvent. The light emission or color change can be more obviously perceived by the naked eye, thereby improving the accuracy of detecting whether the insulating protective layer is damaged.

[0016] In some embodiments, the first detection layer is a light-emitting layer or an acid-base indicator layer. The light-emitting layer can emit light when in contact with the organic solvent, and if the insulating heat-seal layer is damaged, the organic solvent can contact the light-emitting layer at the damaged part to emit light, so that whether the packaging film is damaged can be observed by the naked eye. The acid-base indicator layer can change color based on the acidity or alkalinity of the organic solvent when in contact with the organic solvent, and thus whether the packaging film is damaged can also be observed by the naked eye. In addition, both the light-emitting layer and the acid-base indicator layer are easy to prepare, which can achieve rapid detection of the packaging film while making the preparation of the packaging film less difficult.

[0017] In some embodiments, the insulating protective layer is a nylon layer, the metal layer is an aluminum foil, and the insulating heat-seal layer is a co-polypropylene layer. The nylon layer and the aluminum foil are used to achieve the strength of the packaging film, the insulating heat-seal layer is used to achieve good sealing performance of the packaging film, and the first detection layer is arranged on the side of the insulating heat-seal layer close to the metal layer to detect whether the insulating heat-seal layer is damaged, which can detect the sealing performance of the packaging film, thereby improving the reliability of the packaging film in use.

[0018] Embodiments of the second aspect of the present application provide a battery, which includes the packaging film in the above embodiments, and the packaging film is used to enclose a containing space; and an electrode assembly located in the containing space.

[0019] Embodiments of the third aspect of the present application provide a battery device, which includes the packaging film in the above embodiments or the battery in the above embodiments.

[0020] Embodiments of the fourth aspect of the present application provide an electrical equipment, which includes the battery device in the above embodiments, and the battery device is used to provide electrical energy.

[0021] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the following specific embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0022] In the drawings, identical or similar components or elements are denoted by identical reference numerals throughout the several views, unless otherwise specified. These drawings are not necessarily to scale. It should be understood that these drawings only depict some embodiments in accordance with the present disclosure and should not be considered as limiting the scope of the present disclosure.

[0023] Figure 1 One of cross-sectional views in thickness direction of the encapsulation film for some embodiments of the present application;

[0024] Figure 2 One of cross-sectional views in thickness direction of the encapsulation film for some embodiments of the present application;

[0025] Figure 3 One of cross-sectional views in thickness direction of the encapsulation film for some embodiments of the present application;

[0026] Figure 4 One of cross-sectional views in thickness direction of the encapsulation film for some embodiments of the present application;

[0027] Figure 5 One of cross-sectional views in thickness direction of the encapsulation film for some embodiments of the present application;

[0028] Figure 6 Structure schematic diagram of the vehicle for some embodiments of the present application.

[0029] Explanation of reference signs:

[0030] Vehicle 1000;

[0031] Battery device 100, insulation protection layer 101, insulation heat sealing layer 102, metal layer 103, first detection layer 104, first adhesive layer 105, second detection layer 106, second adhesive layer 107;

[0032] Controller 200,

[0033] Motor 300. DETAILED DESCRIPTION

[0034] The embodiments of the technical solutions of the present application will be described in detail below in combination with the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0035] 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 terms used herein are only for the purpose of describing specific embodiments of the present application, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0036] In the description of the embodiments of the present application, the technical terms "first", "second", etc. 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 "multiple" is more than two, unless otherwise explicitly specified and limited.

[0037] Reference herein to "embodiments" means that the particular features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily a separate or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0038] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of 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 an "or" relationship between the front and rear associated objects.

[0039] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0040] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying 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 limiting the embodiments of the present application.

[0041] 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 in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0042] A packaging film is a structure used to protect and package various electronic components, circuit boards, and the like. The packaging film can be used in the field of batteries, but is not limited thereto.

[0043] By way of example, the packaging film can be used to package an electrode assembly of a battery, and plays an important role in isolating air and moisture and protecting the electrode assembly inside the packaging film from damage. The electrode assembly is located in a receiving space enclosed by the packaging film, and the receiving space also has an electrolyte.

[0044] The packaging film generally includes an insulating protective layer, an insulating heat-sealing layer, and a metal layer located between the insulating protective layer and the insulating heat-sealing layer. The insulating protective layer and the metal layer serve to enhance the strength of the packaging film. The insulating protective layer is located on the side of the metal layer away from the receiving space, i.e., the insulating protective layer is located on the outer side of the metal layer. Conversely, the insulating heat-sealing layer is located on the inner side of the metal layer, i.e., the insulating heat-sealing layer is located on the side of the metal layer close to the receiving space. After the packaging film encloses the receiving space, the insulating heat-sealing layer can be heat-sealed to achieve the sealing of the receiving space. The insulating heat-sealing layer also has the functions of moisture and water resistance. If the insulating heat-sealing layer is damaged, the sealing of the receiving space will be compromised, and the electrolyte located in the receiving space will corrode the metal layer in the packaging film through the damaged part of the insulating heat-sealing layer, affecting the packaging effect of the packaging film.

[0045] Currently, the method for detecting the packaging performance of the packaging film generally uses an oxygen transmission rate tester to test the oxygen barrier effect of the packaging film, and uses a water vapor transmission rate tester to test the water vapor barrier effect of the packaging film. However, these tests require the packaging film to be placed on a special instrument, and the packaging film cannot be detected simply and quickly.

[0046] Based on the above considerations, the packaging film disclosed in the embodiments of the present application is provided. A first detection layer is arranged on the side of the insulating heat-sealing layer close to the metal layer. The first detection layer is configured to undergo a visible change when in contact with an organic solvent.

[0047] In the case where the insulating heat-sealing layer is damaged, the position of the damaged insulating heat-sealing layer can expose the first detection layer. In the case where the surface of the insulating heat-sealing layer is in contact with an organic solvent, the first detection layer exposed by the damaged part of the insulating heat-sealing layer can be in contact with the organic solvent and undergo a visible change. Thus, whether the insulating heat-sealing layer is damaged can be observed by the naked eye, and the packaging film can be detected simply and quickly.

[0048] The packaging film disclosed in the embodiments of the present application can be used in the field of battery packaging, but is not limited thereto. The battery can be used in an electric device such as a vehicle, a ship, or an aircraft, but is not limited thereto. A power supply system of the electric device can be composed of the battery disclosed in the present application.

[0049] The battery can include an electrode assembly and a packaging film for packaging the electrode assembly, the electrode assembly being located in an accommodation space enclosed by the packaging film, and the accommodation space also having an electrolyte.

[0050] Exemplarily, each battery can be a secondary battery or a primary battery; can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto.

[0051] The electrode assembly is a component in which electrochemical reactions occur in the battery. The electrode assembly is mainly formed by winding or layering a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have portions with active materials constituting a main body of the electrode assembly, and portions without active materials of the positive electrode sheet and the negative electrode sheet each constitute a tab. The positive electrode tab and the negative electrode tab can be located together at one end of the main body or be located 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 connect the electrode terminals to form a current loop.

[0052] Reference Figure 1 The packaging film provided by the embodiment of the present application comprises: an insulating protective layer 101, an insulating heat-sealing layer 102, a metal layer 103, and a first detection layer 104, the metal layer 103 is located between the insulating protective layer 101 and the insulating heat-sealing layer 102; the first detection layer 104 is located on the side of the insulating heat-sealing layer 102 close to the metal layer 103, and the first detection layer 104 is configured to undergo a visible change when in contact with an organic solvent.

[0053] The packaging film can be used to enclose an accommodation space to package an object to be packaged. The insulating heat-sealing layer 102 is located on the side of the metal layer 103 close to the accommodation space, and the insulating protective layer 101 is located on the side of the metal layer 103 away from the accommodation space, in other words, the insulating heat-sealing layer 102 is located on the inner side of the metal layer 103, and the insulating protective layer 101 is located on the outer side of the metal layer 103.

[0054] The metal layer 103 provides good mechanical properties to the packaging film, so that the packaging film is more stable and less likely to deform when subjected to external force after being packaged. In addition, the metal layer 103 can effectively resist the corrosion of chemical substances such as acids and bases, thereby prolonging the service life of the packaging film. The material of the metal layer 103 can include but is not limited to one of aluminum, chromium, cobalt, copper, gold, iron, nickel, silver, or other alloys.

[0055] The insulating protective layer 101 is used to provide protection for the encapsulation film, and can enhance the waterproof, oil-proof, dust-proof and other properties of the encapsulation film. In addition, the insulating protective layer 101 can also enhance the strength of the encapsulation film together with the metal layer 103. The material of the insulating protective layer 101 can include, but is not limited to, one of nylon, PET (Polyethylene terephthalate), and the like.

[0056] The insulating heat-seal layer 102 has heat adhesion, and can be adhered at the opening of the accommodation space after heating to seal the accommodation space. The material of the insulating heat-seal layer 102 can include, but is not limited to, one of polypropylene, copolypropylene, polyethylene, polyamide, and the like.

[0057] In some embodiments, the accommodation space can be formed by two encapsulation films. The two encapsulation films are placed opposite to each other, and the insulating heat-seal layers of the two encapsulation films are arranged close to each other, so that the insulating heat-seal layers of the two encapsulation films can be fused to each other to form a sealed structure after the encapsulation films are heated. When encapsulating the object to be encapsulated, the opposite side edges of the two encapsulation films can be heat-sealed first to form a bag shape with one open side. The object to be encapsulated is placed into the bag from the open side, and then the inside of the encapsulation film is evacuated from the open side to have a certain degree of vacuum. Finally, the remaining opposite side edges of the two encapsulation films are heat-sealed to form the accommodation space for accommodating the object to be encapsulated.

[0058] In other embodiments, the accommodation space can also be formed by one encapsulation film. For example, the encapsulation film can be divided into an adjacent first part and a second part. The first part is partially punched to form a punched area for forming the accommodation space, and the remaining part of the first part is arranged around the outer periphery of the punched area to form a sealing edge area.

[0059] Then, the object to be encapsulated is placed in the punched area, and the second part is folded onto the first part to cover the entire electrode assembly and the sealing edge area, wherein the side of the first part and the second part close to each other is the insulating heat-seal layer. The part of the second part and the sealing edge area opposite to each other are heat-sealed, and the remaining part of the sealing edge area and the second part is left with a gap to form a bag shape with one open side. The inside of the encapsulation film is evacuated from the open side to have a certain degree of vacuum, and finally the remaining part of the sealing edge area and the second part are heat-sealed to form the accommodation space for accommodating the object to be encapsulated.

[0060] The visible change refers to the change of the first detection layer 104 when the first detection layer 104 is in contact with the organic solvent, which can be observed by the naked eye, and there is visual visibility. If the insulating heat-seal layer 102 is damaged, the position of the damaged insulating heat-seal layer 102 can expose the first detection layer 104. In the case that the surface of the insulating heat-seal layer 102 is in contact with the organic solvent, the first detection layer 104 exposed by the damaged insulating heat-seal layer 102 can be in contact with the organic solvent to cause a visible change.

[0061] The organic solvent is the same as the meaning commonly understood by those skilled in the art. Exemplarily, the organic solvent can include, but is not limited to, at least one of a carbonate, a carboxylate, and an ether. The first detection layer 104 can be a material capable of producing a visible change such as luminescence or color change when in contact with the organic solvent, which is well known to those skilled in the art.

[0062] In some embodiments, the organic solvent can be applied to the surface of the insulating heat-seal layer 102 before the packaging film is not yet packaged, and whether a visible change occurs can be observed.

[0063] In other embodiments, the organic solvent can be applied to the surface of the insulating heat-seal layer 102 after the heat-sealing of the part of the packaging film to form a bag with one open side, so as to detect the packaging effect in real time when the packaging film is about to complete the packaging, and improve the reliability of the packaging film after the packaging is completed. For example, when the packaging film is used to package the electrode assembly, after the electrode assembly and the electrolyte are both placed in the packaging film with one open side, whether a visible change occurs on the surface of the insulating heat-seal layer 102 can be observed from the opening. It can be understood that, since the electrolyte is an organic solvent, the organic solvent does not need to be additionally applied to the surface of the insulating heat-seal layer 102, and the damage of the insulating heat-seal layer 102 can be directly observed, so as to realize the real-time and rapid detection of the packaging effect.

[0064] In the above technical solution, whether the insulating heat-seal layer 102 is damaged can be observed by naked eyes, so as to realize the simple and rapid detection of the packaging film.

[0065] According to some embodiments of the present application, the first detection layer 104 is configured to luminesce or change color when in contact with the organic solvent.

[0066] In some embodiments, the first detection layer 104 is configured to luminesce when in contact with the organic solvent. The first detection layer 104 can have a luminescent material which does not luminesce in a solid state, but luminesces when dissolved in the organic solvent.

[0067] It is worth noting that the luminescence of the first detection layer 104 referred to herein can be observed under natural light, or can be observed under ultraviolet light irradiation. The light emitted can include, but is not limited to, red light, orange light, yellow light, green light, blue light, or purple light, etc.

[0068] The luminescent material can be a material capable of luminescing in the organic solvent, which is well known to those skilled in the art. Exemplarily, the luminescent material can be a fluorescent material, such as a fluorescent dye, an azo substance, etc. The luminescent material can also be a phenylacetylene substance, a double bond substance, etc., which can luminesce when in contact with the organic solvent.

[0069] In some embodiments, the first detection layer 104 is configured to change color when in contact with the organic solvent. That is, the first detection layer 104 has a color when not in contact with the organic solvent and a color when in contact with the organic solvent, and thus the breakage of the insulating heat-seal layer 102 can be determined by the color change.

[0070] The first detection layer 104 can have a color-changing material, which can be a material capable of changing color in an organic solvent known to those skilled in the art. Exemplarily, the color-changing material can include, but is not limited to, an acid-base indicator, etc. Based on the different chemical properties, the organic solvent can include an acidic solvent and an alkaline solvent. Since the acid-base indicator exhibits different colors at different pH values, the acid-base indicator will change color when in contact with the organic solvent.

[0071] In the above technical solution, the light emission or color change can be more obviously perceived by the naked eye, thereby improving the accuracy of detecting whether the insulating heat-seal layer 102 is broken.

[0072] According to some embodiments of the present application, the first detection layer 104 is bonded to the surface of the insulating heat-seal layer 102 close to the metal layer 103.

[0073] Exemplarily, the first detection layer 104 can have adhesion to be bonded to the surface of the insulating heat-seal layer 102 close to the metal layer 103. The first detection layer 104 can also be bonded to the surface of the insulating heat-seal layer 102 close to the metal layer 103 by a material having adhesion.

[0074] In some embodiments, in a projection plane parallel to the metal layer 103, the orthographic projection of the first detection layer 104 coincides with the orthographic projection of the insulating heat-seal layer 102. Part of the first detection layer 104 can be bonded to the surface of the insulating heat-seal layer 102, or all of the first detection layer 104 can be bonded to the surface of the insulating heat-seal layer 102.

[0075] In the above technical solution, the first detection layer 104 can be firmly attached to the surface of the insulating heat-seal layer 102 close to the metal layer 103, so that when the insulating heat-seal layer 102 is broken, the first detection layer 104 is immediately exposed, improving the reaction efficiency of the first detection layer 104 with the organic solvent, and thus improving the detection efficiency of the packaging film.

[0076] According to some embodiments of the present application, the first detection layer 104 has adhesion.

[0077] The material of the first detection layer 104 can include an adhesive, so that the first detection layer 104 has adhesion. The adhesive can be a material with adhesive properties known to those skilled in the art. Illustratively, the adhesive can include, but is not limited to, at least one of single-component / two-component polyurethane, polyacrylic resin, polyvinyl acetate, urea-formaldehyde resin, and epoxy resin. It can be understood that, due to the adhesion of the first detection layer 104, the first detection layer 104 can be bonded to the surface of the insulating heat-seal layer 102 close to the metal layer 103, while also being able to be bonded to the surface of the metal layer 103 close to the insulating heat-seal layer 102.

[0078] In some embodiments, the first detection layer 104 can be mixed from an adhesive and a luminescent material, so that the first detection layer 104 has adhesion while emitting light when in contact with an organic solvent. The adhesive and the luminescent material are both materials known to those skilled in the art, and can refer to the above description of the adhesive and the luminescent material. The ratio of the adhesive and the luminescent material can be arbitrary, as long as the mixed adhesive and luminescent material can have adhesion while emitting light when in contact with an organic solvent.

[0079] In other embodiments, the first detection layer 104 can be mixed from an adhesive and a color-changing material, so that the first detection layer 104 has adhesion while changing color when in contact with an organic solvent. The adhesive and the color-changing material are both materials known to those skilled in the art, and can refer to the above description of the adhesive and the color-changing material. The ratio of the adhesive and the color-changing material can be arbitrary, as long as the mixed adhesive and color-changing material can have adhesion while changing color when in contact with an organic solvent.

[0080] In the above technical solution, the first detection layer 104 can be attached to the surface of the insulating heat-seal layer 102 away from the metal by using its own adhesion, so that the first detection layer 104 is in close contact with the insulating heat-seal layer, and thus the first detection layer 104 can be immediately exposed at the damaged part of the insulating heat-seal layer once the insulating heat-seal layer is damaged, which shortens the reaction time of the organic solvent and the detection layer, further improves the detection efficiency of the packaging film, and also maintains a small overall thickness of the packaging film.

[0081] Reference Figure 2 According to some embodiments of the present application, the packaging film further comprises a first adhesive layer 105 located on the side of the first detection layer 104 close to the insulating heat-seal layer 102, for bonding the first detection layer 104 to the surface of the insulating heat-seal layer 102 close to the metal layer 103.

[0082] The first adhesive layer 105 can be composed of an adhesive. The adhesive composing the first adhesive layer 105 can include, but is not limited to, organic and inorganic adhesives, liquid and solid adhesives, structural and non-structural adhesives, etc. The adhesive composing the first adhesive layer 105 can be in the form of a solution, an emulsion, a paste, a film, a tape, a powder, a pellet, a stick, etc. Also, the adhesive composing the first adhesive layer 105 can be in the form of a room temperature curing type, a heat curing type, a hot melt type, a pressure sensitive type, a re-wet type, etc. In some embodiments, the adhesive can include components such as resins, rubber-based, natural polymer compounds, etc., and can include components such as curing agents, toughening agents, diluents, fillers, etc. Illustratively, the adhesive composing the first adhesive layer 105 can include, but is not limited to, at least one of a single component / dual component polyurethane, a polyacrylic resin, a polyvinyl acetate, a urea-formaldehyde resin, an epoxy resin, etc.

[0083] In the case where the insulating heat-seal layer 102 is damaged, the first adhesive layer 105 bonded to the insulating heat-seal layer 102 is generally damaged together with the insulating heat-seal layer 102, thereby exposing the first detection layer 104 so that the organic solvent can contact the first detection layer 104. In some embodiments, the first adhesive layer 105 has a relatively thin thickness, for example, 2 μm to 3 μm, so that the first adhesive layer 105 is easily damaged together with the insulating heat-seal layer 102 when the first adhesive layer 105 bonds the first detection layer 104 and the insulating heat-seal layer 102, thereby increasing the accuracy of the detection of the encapsulation film.

[0084] In some embodiments, in the case where the first detection layer 104 is bonded to the surface of the insulating heat-seal layer 102 close to the metal layer 103 by the first adhesive layer 105, the first detection layer 104 can or can not have adhesion.

[0085] Illustratively, the first detection layer 104 has adhesion, and the first detection layer 104 includes a luminescent material. In the preparation of the encapsulation film, a mixture of an adhesive and a luminescent material can be uniformly coated on one side surface of the metal layer 103 to obtain the first detection layer 104. Thereafter, the surface of the insulating protective layer 101 is subjected to plasma corona treatment, and an adhesive is coated on one side surface of the insulating heat-seal layer 102 to form the first adhesive layer 106, and an adhesive is coated on the surface of the metal layer 103 facing away from the first detection layer 104. Finally, the encapsulation film is prepared by laminating and compounding in the order of the insulating heat-seal layer 102, the first adhesive layer 106, the first detection layer 104, the metal layer 103, and the insulating protective layer 101, and by performing a drying process.

[0086] According to the technical scheme, even if the first detection layer 104 is not adhesive, the first detection layer 104 can be firmly attached to the surface of the insulating heat-sealing layer close to the metal layer 103, thereby expanding the material selection range of the first detection layer 104 and simplifying the preparation of the detection layer.

[0087] According to some embodiments of the present application, the thickness ratio of the insulating heat-sealing layer 102 and the first detection layer 104 is 0.01-0.17.

[0088] For example, the thickness ratio of the insulating heat-sealing layer 102 and the first detection layer 104 can be 0.011, 0.03, 0.05 or 0.16.

[0089] The insulating heat-sealing layer 102 plays a sealing role, and therefore, the insulating heat-sealing layer 102 needs a certain thickness to play a better sealing role.

[0090] It can be understood that when the packaging film encapsulates the object to be encapsulated, it needs to be deformed to adapt to the shape of the object to be encapsulated, so that the packaging film is in close contact with the object to be encapsulated, thereby achieving a better encapsulation effect. In order to make the packaging film have better deformation ability, the overall thickness of the packaging film needs to be thin, therefore, the thickness of the first detection layer 104 is much smaller than the thickness of the insulating heat-sealing layer 102, thereby keeping the overall thickness of the packaging film thin.

[0091] In some embodiments, the thickness ratio of the first detection layer 104 and the metal layer 103 can be 0.015-0.25, so that the thickness of the metal layer 103 is much larger than the thickness of the first detection layer 104, thereby keeping the mechanical properties of the packaging film strong.

[0092] In some embodiments, the thickness ratio of the first detection layer 104 and the insulating protective layer 101 can be 0.025-0.5, that is, the thickness of the insulating protective layer 101 is larger than that of the first detection layer 104, so that the insulating protective layer 101 plays a better protection role.

[0093] In some embodiments, the packaging film further comprises a first adhesive layer 105, and the thickness ratio of the first detection layer 104 and the first adhesive layer 105 can be 0.3-2.5, so that the thickness of the first adhesive layer 105 and the first detection layer 104 is small, and the overall thickness of the packaging film is not affected.

[0094] In the technical solution, the thickness ratio of the insulating heat-seal layer 102 and the first detection layer 104 is 0.01-0.17, so that the thickness of the first detection layer 104 is large enough to improve the reliability of the visible change of the first detection layer 104 in the organic solvent, and the thickness of the first detection layer 104 is smaller than the thickness of the insulating heat-seal layer 102, so that the existence of the first detection layer 104 does not cause the thickness of the packaging film to be too large, and the problem of difficulty in deformation of the packaging film caused by the too large thickness of the packaging film is avoided to a certain extent, and the packaging object is well packaged.

[0095] According to some embodiments of the present application, the thickness of the first detection layer 104 is 1-5 μm.

[0096] Exemplarily, the thickness of the first detection layer 104 can be 1.5 μm, 2 μm, 3 μm, 4 μm or 4.5 μm.

[0097] The thickness of the insulating heat-seal layer 102 can be 30-90 μm, and exemplarily, the thickness of the insulating heat-seal layer 102 can be 45 μm, 60 μm, 75 μm or 85 μm.

[0098] The thickness of the metal layer 103 can be 20-60 μm, and exemplarily, the thickness of the metal layer 103 can be 30 μm or 50 μm.

[0099] The thickness of the insulating protective layer 101 can be 10-40 μm, and exemplarily, the thickness of the insulating protective layer 101 can be 15 μm, 25 μm or 35 μm.

[0100] In the technical solution, the thickness of the first detection layer 104 is 1-5 μm, so that the first detection layer 104 can have a visible change in the organic solvent, and the overall thickness of the packaging film is not too large, so that the packaging film has a good packaging effect.

[0101] Reference Figure 3 According to some embodiments of the present application, the packaging film further comprises: a second detection layer 106 located on the side of the insulating protective layer 101 close to the metal layer 103, and the second detection layer 106 is configured to have a visible change when in contact with the organic solvent.

[0102] In the case of damage to the insulating protective layer 101, the position of the damaged insulating protective layer 101 can expose the second detection layer 106, and in the case of contact between the surface of the insulating protective layer 101 and the organic solvent, the second detection layer 106 exposed at the damaged position can be in contact with the organic solvent to have a visible change.

[0103] In some embodiments, the organic solvent can be applied to the surface of the insulating protective layer 101 before the encapsulation film is encapsulated, and whether a visible change occurs can be observed.

[0104] In other embodiments, the organic solvent can also be applied to the surface of the insulating protective layer 101 after the partial encapsulation film is heat-sealed to form a bag with one open side, so as to detect the encapsulation effect in real time when the encapsulation film is about to be completed, and improve the reliability of the encapsulation film after the encapsulation is completed.

[0105] It can be understood that, since the insulating protective layer 101 is located outside the metal layer 103, in yet other embodiments, the organic solvent can also be applied to the surface of the insulating protective layer 101 away from the metal layer after the encapsulation film is completed, so as to detect whether the insulating protective layer 101 is damaged during the use of the encapsulation film.

[0106] The second detection layer 106 can be a material known to those skilled in the art which can produce a visible change such as light emission or color change when in contact with the organic solvent.

[0107] In the above technical solution, the second detection layer 106 exposed by the damaged insulating protective layer 101 can be in contact with the organic solvent to produce a visible change, and thus whether the insulating protective layer 101 is damaged can be observed by the naked eye.

[0108] According to some embodiments of the present application, the second detection layer 106 is configured to emit light or change color when in contact with the organic solvent.

[0109] In some embodiments, the second detection layer 106 is configured to emit light when in contact with the organic solvent. The second detection layer 106 can have a light-emitting material which does not emit light in a solid state, but emits light when dissolved in an organic solvent. The light-emitting material can be a material known to those skilled in the art which can emit light in an organic solvent, and exemplary, the light-emitting material can be a fluorescent material such as a fluorescent dye, an azo substance, etc., and the light-emitting material can also be a phenylacetylene substance, a double bond substance, etc.

[0110] In other embodiments, the second detection layer 106 is configured to change color when in contact with the organic solvent. That is, the color of the second detection layer 106 when not in contact with the organic solvent is different from the color when in contact with the organic solvent, and thus whether the insulating protective layer 101 is damaged can be determined by the change in color.

[0111] The second detection layer 106 can have a color-changing material, which can be a material known to those skilled in the art which can change color in an organic solvent, and exemplary, the color-changing material can include but is not limited to an acid-base indicator, etc.

[0112] In some embodiments, the second detection layer 106 can have adhesion to adhere to the surface of the insulating protective layer 101 close to the metal. Exemplarily, the second detection layer 106 can be mixed by an adhesive and a luminescent material / color-changing material, so that the second detection layer 106 has adhesion while emitting light when in contact with the organic solvent.

[0113] Reference Figure 4 In other embodiments, the packaging film further comprises a second adhesive layer 107 between the second detection layer 106 and the insulating protective layer 101, and the second detection layer 106 can be adhered to the surface of the insulating protective layer 101 close to the metal through the second adhesive layer 107. The second adhesive layer 107 can be composed of an adhesive, and exemplarily, the material of the second adhesive layer 107 can be the same as that of the first adhesive layer 105.

[0114] In some embodiments, the thickness of the first detection layer 104 can be the same as that of the second detection layer 106, and the material of the second adhesive layer 107 can be the same as that of the first adhesive layer 105.

[0115] In the above technical solution, the light or color change can be more obviously perceived by the naked eye, thereby improving the accuracy of detecting whether the insulating protective layer 101 is damaged.

[0116] It can be understood that, with reference Figure 5 In other embodiments, the packaging film can also not be provided with the second detection layer 106, and the insulating protective layer 101 can be directly adhered to the surface of the metal layer 103 through the second adhesive layer 107.

[0117] According to some embodiments of the present application, the first detection layer 104 is a luminescent layer or an acid-base indicator layer.

[0118] In some embodiments, the luminescent layer can be composed of only a luminescent material.

[0119] In other embodiments, the luminescent layer can also be mixed by an adhesive and a luminescent material.

[0120] The acid-base indicator layer can be mixed by an acid-base indicator and an adhesive, and the acid-base indicator layer can change color when in contact with the organic solvent.

[0121] The luminescent material, the adhesive, and the acid-base indicator can refer to the above related description, and will not be repeated here.

[0122] In the technical solution, the light-emitting layer can emit light when in contact with an organic solvent. If the insulating heat-seal layer 102 is damaged, the organic solvent can contact the light-emitting layer at the damaged position and emit light, so that whether the packaging film is damaged can be observed by naked eyes. The acid-base indicator layer can change color based on the acid-base property of the organic solvent when in contact with the organic solvent, so that whether the packaging film is damaged can also be observed by naked eyes. In addition, the light-emitting layer or the acid-base indicator layer is easy to prepare, so that the packaging film can be prepared with low difficulty while rapid detection of the packaging film is achieved.

[0123] According to some embodiments of the present application, the insulating protective layer 101 is a nylon layer, the metal layer 103 is an aluminum foil, and the insulating heat-seal layer 102 is a copolypropylene layer.

[0124] That is, the packaging film can form an aluminum-plastic film. The aluminum-plastic film can be used for packaging in the field of batteries, and the aluminum-plastic film has high barrier property, puncture resistance, electrolyte resistance, high-temperature insulation, and high cold stamping formability, etc., and provides good protection effect for the battery.

[0125] In the technical solution, the nylon layer and the aluminum foil are used to achieve the strength of the packaging film, the insulating heat-seal layer 102 is used to achieve good sealing property of the packaging film, and the first detection layer 104 is arranged on the side of the insulating heat-seal layer 102 close to the metal layer 103 to detect whether the insulating heat-seal layer 102 is damaged, so that the sealing performance of the packaging film can be detected, and the reliability of the packaging film in use is improved.

[0126] The embodiments of the present application provide a battery, which includes the packaging film in the above embodiments, and the packaging film is used to enclose a containing space; and an electrode assembly located in the containing space.

[0127] The structure of the battery and the electrode assembly can refer to the related description of the above embodiments, and will not be described here.

[0128] The first detection layer can be used to rapidly detect the packaging effect of the packaging film, improve the reliability of the packaging film in packaging the electrode assembly, and thus improve the stability of the battery in use.

[0129] The embodiments of the present application provide a battery device, which includes the packaging film in the above embodiments or the battery in the above embodiments.

[0130] The battery device can include a box body and a battery, and the battery is contained in the box body. The box body is used to provide a containing space for the battery, and the box body can have various structures.

[0131] In the battery device, the battery can be multiple, and the multiple batteries can be connected in series or in parallel or in a mixed connection. The mixed connection means that there are both series and parallel connections among the multiple batteries. The multiple batteries can be directly connected in series or in parallel or in a mixed connection, and the whole formed by the multiple batteries is accommodated in the box. Of course, the battery device can also be that the multiple batteries are first connected in series or in parallel or in a mixed connection to form a battery module, and the multiple battery modules are connected in series or in parallel or in a mixed connection to form a whole, and are accommodated in the box. The battery device can also include other structures, for example, the battery device can also include a busbar component for realizing the electrical connection between the multiple batteries.

[0132] The packaging film can be used for packaging any component that needs to be packaged in the battery device.

[0133] The application embodiment provides a kind of electric equipment, it includes the battery device in above-mentioned embodiment, battery device is used to provide electric energy.

[0134] The electric equipment can be but not limited to mobile phone, tablet, notebook computer, electric toy, electric tool, electric car, electric car, ship, spacecraft and so on. Among them, electric toy can include fixed or mobile electric toy, for example, game machine, electric car toy, electric ship toy and electric aircraft toy and so on, spacecraft can include aircraft, rocket, space shuttle and spaceship and so on.

[0135] The following embodiments are described for convenience with a vehicle 1000 as an example of a power consumption device of an embodiment of the application.

[0136] Please refer to Figure 6 , Figure 6 The vehicle structure schematic diagram provided by some embodiments of the application. The vehicle 1000 can be a fuel car, a gas car or a new energy car. The new energy car can be a pure electric car, a hybrid car or an extended range car. 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 the operating power supply of the vehicle 1000. The vehicle 1000 can also 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, for the working power demand of the vehicle 1000 during starting, navigation and driving.

[0137] In some embodiments of the application, the battery device 100 can not only be used as the operating power supply of the vehicle 1000, but also be used as the driving power supply of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0138] The application embodiment provides a kind of packaging film, referenceFigure 5 The packaging film comprises, in sequence, an insulating heat-sealing layer 102, a first adhesive layer 105, a first detection layer 104, a metal layer 103, a second adhesive layer 107, and an insulating protective layer 101, wherein the first detection layer 104 is configured to emit light when in contact with an organic solvent.

[0139] The metal layer 103 is an aluminum foil layer, the insulating heat-sealing layer 102 is a copolypropylene layer, and the insulating protective layer 101 is a nylon layer.

[0140] The material of the first adhesive layer 105 includes, but is not limited to, at least one of a single-component / dual-component polyurethane, a polyacrylic resin, a polyvinyl acetate, a urea-formaldehyde resin, and an epoxy resin.

[0141] The material of the second adhesive layer 107 includes, but is not limited to, at least one of a single-component / dual-component polyurethane, a polyacrylic resin, a polyvinyl acetate, a urea-formaldehyde resin, and an epoxy resin.

[0142] The first detection layer 104 is composed of an adhesive and a light-emitting material, which can be an azo substance, a phenylacetylene substance, a double bond substance, etc., and the material of the adhesive includes, but is not limited to, at least one of a single-component / dual-component polyurethane, a polyacrylic resin, a polyvinyl acetate, a urea-formaldehyde resin, and an epoxy resin.

[0143] The thickness of the copolypropylene layer can be 30-90 μm, the thickness of the first adhesive layer 105 can be 2-3 μm, the thickness of the second adhesive layer 107 can be 2-3 μm, the thickness of the first detection layer 104 can be 1-5 μm, the thickness of the aluminum foil can be 20-60 μm, and the thickness of the nylon layer can be 10-40 μm.

[0144] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in each embodiment can be combined in any way as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An encapsulation film, characterized by, The packaging film comprises: an insulating protective layer; an insulating heat-sealing layer; a metal layer between the insulating protective layer and the insulating heat-sealing layer; a first detection layer on the side of the insulating heat-sealing layer close to the metal layer, the first detection layer being configured to visibly change when in contact with an organic solvent.

2. The encapsulation film according to claim 1, characterized in that, The first detection layer is configured to emit light or change color when in contact with the organic solvent.

3. The encapsulation film of claim 1, wherein, The first detection layer is bonded to the surface of the insulating heat-sealing layer close to the metal layer.

4. The encapsulation film according to claim 3, characterized in that, The first detection layer has adhesion.

5. The encapsulation film according to claim 3, wherein, The packaging film further comprises: a first adhesive layer on the side of the first detection layer close to the insulating heat-sealing layer, for bonding the first detection layer to the surface of the insulating heat-sealing layer close to the metal layer.

6. The encapsulation film according to any one of claims 1 to 5, wherein, The thickness ratio of the insulating heat-sealing layer to the first detection layer is 0.01-0.

17.

7. The encapsulation film according to claim 6, characterized in that The thickness of the first detection layer is 1-5 μm.

8. The encapsulation film according to any one of claims 1-5, wherein, The packaging film further comprises: a second detection layer on the side of the insulating protective layer close to the metal layer, the second detection layer being configured to visibly change when in contact with an organic solvent.

9. The encapsulation film of claim 8, wherein, The second detection layer is configured to emit light or change color when in contact with the organic solvent.

10. The encapsulation film according to any one of claims 1-5, wherein, The first detection layer is a light-emitting layer or an acid-base indicator layer.

11. The encapsulation film according to any one of claims 1-5, wherein, The insulating protective layer is a nylon layer, the metal layer is an aluminum foil, and the insulating heat-sealing layer is a co-polypropylene layer.

12. A battery, characterized by The packaging film as claimed in any one of claims 1-11 is used to enclose a containing space. An electrode assembly is located in the containing space. The packaging film as claimed in any one of claims 1-11 or the battery as claimed in claim 12.

13. A battery device characterized by comprising: The battery device as claimed in claim 13 is used to provide electrical energy.

14. An electrical device, characterized by ​

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