Aluminum-plastic film for battery, preparation method of aluminum-plastic film, battery and electric device

Abstract

The invention discloses an aluminum plastic film for a battery, a preparation method of the aluminum plastic film, the battery and an electric device, the aluminum plastic film for the battery comprises a nylon layer, a metal layer and a CPP layer which are sequentially stacked, the CPP layer comprises a bonding layer, a middle layer and a heat sealing layer which are sequentially stacked, the middle layer comprises a heat conduction auxiliary agent, and the heat sealing layer comprises a heat conduction auxiliary agent. The thickness ratio of the bonding layer to the middle layer to the heat sealing layer is 1: (1.5-4.0): 1; relative to the middle layer, the use amount of the heat conduction auxiliary agent is 0.5%-20% (w / w). According to the technical scheme, the thermal conductivity of the aluminum-plastic film is improved.

Description

Technical Field

[0001] This invention relates to the field of energy storage technology, and in particular to an aluminum-plastic film for batteries, its preparation method, a battery, and an electrical device. Background Technology

[0002] With the rapid development of the soft-pack lithium-ion battery industry, increasingly higher requirements have been placed on the thermal conductivity of aluminum-plastic film. Currently, lithium-ion batteries generate a significant amount of heat during use, resulting in higher actual operating temperatures. Combined with the effects of high-temperature environments, this can lead to phenomena such as bulging and even spontaneous combustion, potentially causing serious consequences. Summary of the Invention

[0003] The main objective of this invention is to provide an aluminum-plastic film for batteries, a method for preparing the same, a battery, and an electrical device, with the aim of improving the thermal conductivity of the aluminum-plastic film.

[0004] To achieve the above objectives, the present invention proposes an aluminum-plastic film for batteries, comprising a nylon layer, a metal layer, and a CPP layer stacked sequentially. The CPP layer comprises an adhesive layer, an intermediate layer, and a heat-sealing layer stacked sequentially. The intermediate layer contains a thermally conductive additive. The thickness ratio of the adhesive layer, the intermediate layer, and the heat-sealing layer is 1:(1.5-4.0):1. The amount of the thermally conductive additive relative to the intermediate layer is 0.5%-20% (w / w).

[0005] In one embodiment, the thermally conductive agent includes one or more of boron nitride, aluminum nitride, silicon nitride, aluminum oxide, and zinc oxide; and / or, The thickness of the CPP layer is 10-150 μm.

[0006] In one embodiment, the aluminum-plastic film further includes a first thermally conductive adhesive layer located between the nylon layer and the metal layer, the first thermally conductive adhesive layer comprising a thermally conductive modified polyurethane adhesive or a thermally conductive modified isocyanate adhesive. The aluminum-plastic film further includes a second thermally conductive adhesive layer located between the metal layer and the CPP layer, the second thermally conductive adhesive layer comprising a thermally conductive modified polyolefin adhesive.

[0007] In one embodiment, the first thermally conductive adhesive layer comprises 15%-45% (w / w) of an isocyanate-based curing agent; and / or, The thermally modified polyolefin adhesive comprises a thermally modified maleic anhydride-grafted polyolefin, wherein the thermally modified maleic anhydride-grafted polyolefin contains 1-10% (w / w) of an epoxy-based curing agent; and / or, The thickness of the first thermally conductive adhesive layer and / or the second thermally conductive adhesive layer is 1-10 μm.

[0008] In one embodiment, the isocyanate curing agent includes one or more of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate isophorone diisocyanate; and / or, The epoxy curing agent includes one or more of the following: epoxy resin modified with alicyclic amines, epoxy resin modified with phenolic amino alcohols, and epoxy resin modified with polyamides; and / or, The thickness of the first thermally conductive adhesive layer and / or the second thermally conductive adhesive layer is 1-5 μm.

[0009] In one embodiment, a first passivation layer is provided between the metal layer and the first thermally conductive adhesive layer, the thickness of the first passivation layer being 10-100 nm; and / or, A second passivation layer is provided between the metal layer and the second thermally conductive adhesive layer, the thickness of the second passivation layer being 10-100 nm; and / or, The metal layer includes an aluminum foil layer with a thickness of 20-65 μm; and / or, The material of the nylon layer includes nylon 66, and the thickness of the nylon layer is 5-35 μm.

[0010] The present invention also proposes a method for preparing the above-mentioned aluminum-plastic film for batteries, comprising the following steps: A nylon layer is placed on one side of the metal layer; The CPP layer is placed on the other side of the metal layer by lamination or extrusion coating. After aging, the aluminum-plastic film for the battery is obtained.

[0011] In one embodiment, before the step of setting the nylon layer or CPP layer on the metal layer, the following step is further included: A first passivation solution and a second passivation solution are applied to one side of the cleaned metal layer to form a first passivation layer on one side of the metal layer and a second passivation layer on the other side of the metal layer; wherein the coating time is 2-10s and the drying temperature is 100-260℃. A first thermally conductive adhesive is applied to the surface of the first passivation layer to form a first thermally conductive adhesive layer for the nylon layer to cover; the drying temperature of the coating is 50-130°C. A second thermally conductive adhesive is applied to the surface of the second passivation layer to form a second thermally conductive adhesive layer that is covered by the CPP layer; the drying temperature of the coating is 40-100°C. And / or, the aging conditions are 50-100°C for 2-7 days.

[0012] The present invention also proposes a battery comprising an aluminum-plastic film for batteries, wherein the aluminum-plastic film for batteries comprises a nylon layer, a metal layer and a CPP layer stacked sequentially, the CPP layer comprises an adhesive layer, an intermediate layer and a heat-sealing layer stacked sequentially, the intermediate layer comprising a thermally conductive additive, wherein the thickness ratio of the adhesive layer, the intermediate layer and the heat-sealing layer is 1:(1.5-4.0):1; and the amount of the thermally conductive additive relative to the intermediate layer is 0.5%-20% (w / w).

[0013] The present invention also proposes an electrical device comprising a battery, the battery comprising an aluminum-plastic film for the battery, the aluminum-plastic film for the battery comprising a nylon layer, a metal layer and a CPP layer stacked sequentially, the CPP layer comprising an adhesive layer, an intermediate layer and a heat-sealing layer stacked sequentially, the intermediate layer comprising a thermally conductive agent, wherein the thickness ratio of the adhesive layer, the intermediate layer and the heat-sealing layer is 1:(1.5-4.0):1; and the amount of the thermally conductive agent relative to the intermediate layer is 0.5%-20% (w / w).

[0014] The technical solution of this invention adopts a CPP layer adhesive layer, intermediate layer and heat-sealing layer thickness ratio of 1:(1.5-4.0):1, and the amount of thermally conductive additive relative to the intermediate layer is 0.5%-20% (w / w). By adding thermally conductive additive to the intermediate layer and increasing the thickness of each CPP layer, the aluminum-plastic film for batteries has good thermal conductivity. The aluminum-plastic film for batteries can transfer a large amount of heat, quickly dissipate the heat of the battery in thermal runaway, avoid battery thermal runaway or prolong the thermal runaway time, and improve the thermal conductivity and reliability of the aluminum-plastic film for batteries. At the same time, it does not change the composition of the adhesive layer, heat-sealing layer, nylon layer and metal layer, ensuring good adhesion, heat resistance and electrolyte corrosion resistance of the aluminum-plastic film for batteries. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the aluminum-plastic film for batteries of the present invention; Figure 2 This is a schematic diagram of another embodiment of the aluminum-plastic film for batteries of the present invention; Figure 3 This is a schematic diagram of another embodiment of the aluminum-plastic film for batteries of the present invention.

[0017] Explanation of icon numbers: 100. Nylon layer; 200. Metal layer; 300, CPP layer; 310, adhesive layer; 320, intermediate layer; 330, heat-sealing layer; 410. First thermally conductive adhesive layer; 420. Second thermally conductive adhesive layer; 510, First passivation layer; 520, Second passivation layer.

[0018] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] It should be noted that the meaning of "and / or" throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that satisfies both A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0021] The terms “comprising,” “including,” “containing,” “containing,” “having,” or other variations thereof are intended to cover non-closed inclusion, and no distinction is made between these terms. The term “comprising” means that other steps and components may be added without affecting the final result. The term “comprising” also includes the terms “consistently composed of” and “substantially composed of”. The compositions and methods / processes of the present invention comprise, consist of, and substantially consist of the essential elements and limitations described herein, as well as any additional or optional components, parts, steps, or limitations described herein. All numerical values ​​or expressions relating to component amounts, process conditions, etc., used in the specification and claims are to be understood in all cases to be modified by “about.” All ranges relating to the same component or property include endpoints that can be combined independently. Because these ranges are continuous, they include every value between a minimum and a maximum value. It should also be understood that any numerical range referenced in this application is intended to include all subranges within that range. As used herein, “parts by weight,” “number of parts by weight,” “mass parts,” or “mass parts” are used interchangeably. A part by weight can be any fixed weight expressed in milligrams, grams, or kilograms (e.g., 1 mg, 1 g, 2 g, 5 g, or 1 kg). For example, a composition consisting of 1 part by weight of component a and 9 parts by weight of component b can be a composition consisting of 1 gram of component a + 9 grams of component b, or 10 grams of component a + 90 grams of component b, etc.

[0022] This invention proposes an aluminum-plastic film for batteries.

[0023] Please see Figure 1 In this embodiment of the invention, the aluminum-plastic film for batteries includes a nylon layer 100, a metal layer 200, and a CPP layer 300 stacked sequentially. The CPP layer 300 includes an adhesive layer 310, an intermediate layer 320, and a heat-sealing layer 330 stacked sequentially. The intermediate layer 320 contains a thermally conductive additive. The thickness ratio of the adhesive layer 310, the intermediate layer 320, and the heat-sealing layer 330 is 1:(1.5-4.0):1. The amount of the thermally conductive additive relative to the intermediate layer 320 is 0.5%-20% (w / w).

[0024] The technical solution of this invention adopts a CPP layer 300 with an adhesive layer 310, an intermediate layer 320, and a heat-sealing layer 330 thickness ratio of 1:(1.5-4.0):1. The amount of the thermally conductive agent relative to the intermediate layer 320 is 0.5%-20% (w / w). By adding the thermally conductive agent to the intermediate layer 320 and adjusting the thickness of each layer of the CPP layer 300, the aluminum-plastic film for batteries has excellent thermal conductivity. This allows the aluminum-plastic film to transfer a large amount of heat, rapidly dissipating heat from thermal runaway batteries, preventing thermal runaway or prolonging the thermal runaway time, thus improving the thermal conductivity and reliability of the aluminum-plastic film for batteries. Simultaneously, the composition of the adhesive layer 310, the heat-sealing layer 330, the nylon layer 100, and the metal layer 200 remains unchanged, ensuring good adhesion, heat resistance, and electrolyte resistance of the aluminum-plastic film for batteries.

[0025] Specifically, the nylon layer 100 can serve as a protective layer. In one embodiment, the thickness of the nylon layer 100 is 5-35 μm. The thickness of the nylon layer 100 can be 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, or any combination of these values. The nylon layer 100 can be made of various materials. In one embodiment, the material of the nylon layer 100 includes nylon 66, thereby improving the high-temperature resistance, mechanical properties, and corrosion resistance of the aluminum-plastic film, and thus improving the safety and reliability of the aluminum-plastic film for batteries.

[0026] Specifically, the metal layer 200 serves as an insulating layer, not only blocking water and oxygen, and preventing the electrolyte and solvent from seeping out, but also acting as a heat conductor, transferring internal heat to the outside and improving the thermal conductivity of the aluminum-plastic film for batteries. In one embodiment, the thickness of the metal layer 200 is 20-65 μm. The thickness of the metal layer 200 can be 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, or any combination of these values. In one embodiment, the metal layer 200 includes an aluminum foil layer. Further, in one embodiment, the thickness of the aluminum foil layer is 5-35 μm.

[0027] Specifically, the CPP layer 300 includes an adhesive layer 310, an intermediate layer 320, and a heat-sealing layer 330 stacked sequentially. By adding a thermally conductive additive to the intermediate layer 320 of the CPP layer 300, the thermal conductivity of the CPP layer 300 is improved, thereby improving the thermal conductivity of the aluminum-plastic film for batteries and the battery itself. In the intermediate layer 320, the amount of thermally conductive additive is 0.5%-20% (w / w), thus ensuring the thermal conductivity of the aluminum-plastic film for batteries. Simultaneously, the thickness ratio of the adhesive layer 310, the intermediate layer 320, and the heat-sealing layer 330 is 1:(1.5-4.0):1, further improving the thermal conductivity of the aluminum-plastic film for batteries.

[0028] In one embodiment, the thermal conductivity aid includes one or more of boron nitride, aluminum nitride, silicon nitride, aluminum oxide, and zinc oxide. By using one or more of boron nitride, aluminum nitride, silicon nitride, aluminum oxide, and zinc oxide, the thermal conductivity of the CPP layer 300 is improved, thereby improving the thermal conductivity of the aluminum-plastic film for batteries.

[0029] In one embodiment, the thickness of the CPP layer 300 is 10-150 μm. The thickness of the CPP layer 300 can be 10 μm, 20 μm, 40 μm, 60 μm, 80 μm, 100 μm, 120 μm, 140 μm, 150 μm, or any combination of these values. Further, in one embodiment, the thickness of the CPP layer 300 is 10-50 μm. By adjusting the thicknesses of the nylon layer 100 and the CPP layer 300, the thermal conductivity of the aluminum-plastic film for batteries is improved.

[0030] Please see Figure 2 In one embodiment, the aluminum-plastic film further includes a first thermally conductive adhesive layer 410 located between the nylon layer 100 and the metal layer 200, the first thermally conductive adhesive layer 410 comprising a thermally conductive modified polyurethane adhesive or a thermally conductive modified isocyanate adhesive.

[0031] The nylon layer 100 is bonded to one side of the metal layer 200 by a first thermally conductive adhesive layer 410, which includes a thermally conductive modified polyurethane adhesive or a thermally conductive modified isocyanate adhesive, thereby further improving the thermal conductivity of the aluminum-plastic film for batteries.

[0032] In one embodiment, the first thermally conductive adhesive layer 410 contains 15-45% (w / w) of an isocyanate curing agent.

[0033] There are various types of isocyanate curing agents. In one embodiment, the isocyanate curing agent includes one or more of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate.

[0034] Please continue reading. Figure 2 In one embodiment, the aluminum-plastic film further includes a second thermally conductive adhesive layer 420 located between the metal layer 200 and the CPP layer 300, the second thermally conductive adhesive layer 420 comprising a thermally conductive modified polyolefin adhesive.

[0035] The second thermally conductive adhesive layer 420 bonds the CPP layer 300 to the other side of the metal layer 200. The second thermally conductive adhesive layer 420 includes a thermally conductive modified polyolefin adhesive, thereby further improving the thermal conductivity of the aluminum-plastic film for batteries.

[0036] In one embodiment, the thermally modified polyolefin adhesive includes thermally modified maleic anhydride-grafted polyolefin to improve the thermal conductivity of aluminum-plastic films for batteries.

[0037] In one embodiment, the thermally conductive modified polyolefin adhesive comprises 1-10% (w / w) of an epoxy-based curing agent.

[0038] In one embodiment, the epoxy curing agent includes one or more of the following: epoxy resin with alicyclic amine modified curing agent, epoxy resin with phenolic amino alcohol curing agent, and epoxy resin with polyamide curing agent.

[0039] Thus, the thermal conductivity of the aluminum-plastic film for batteries can be further improved by simultaneously setting the first thermally conductive adhesive layer 410 and the second thermally conductive adhesive layer 420.

[0040] In one embodiment, the thickness of the first thermally conductive adhesive layer 410 and / or the second thermally conductive adhesive layer 420 is 1-10 μm. By adjusting the thickness of the first thermally conductive adhesive layer 410 and / or the second thermally conductive adhesive layer 420, the thermal conductivity of the aluminum-plastic film for batteries can be improved.

[0041] By using the first thermally conductive adhesive layer 410 and / or the second thermally conductive adhesive layer 420, the thermal conductivity of the aluminum-plastic film for batteries is further enhanced, preventing the adhesive layer 310 from affecting the overall thermal conductivity.

[0042] Please see Figure 3 In one embodiment, a first passivation layer 510 is provided between the metal layer 200 and the first thermally conductive adhesive layer 410, and the thickness of the first passivation layer 510 is 10-100 nm; and / or, A second passivation layer 520 is provided between the metal layer 200 and the second thermally conductive adhesive layer 420, and the thickness of the second passivation layer 520 is 10-100nm.

[0043] By providing a first passivation layer 510 and a second passivation layer 520 on both sides of the metal layer 200, the bonding strength between the metal layer 200 and the first thermally conductive adhesive layer 410 and the second thermally conductive adhesive layer 420 is improved. Furthermore, the thickness of the first passivation layer 510 and / or the second passivation layer 520 is 10-100 nm to prevent the passivation layer from being too thin or too thick, ensuring bonding performance while also considering the overall thickness of the aluminum-plastic film used in the battery.

[0044] In one embodiment, the materials used to prepare the first passivation layer 510 include: 1.5-9 wt% nitrate, 0.5-1.5 wt% chromium salt, 3-10 wt% water-soluble resin, 5-15% isopropanol, and 64.5-90 wt% water; and / or, The materials used to prepare the second passivation layer 520 include: 2-12 wt% nitrate, 0.7-2 wt% chromium salt, 4-18 wt% water-soluble resin, 7.5-20% isopropanol and 48-86.8 wt% water.

[0045] The preparation materials for the first passivation layer 510 and the second passivation layer 520 are prepared by using nitrate, chromium salt, water-soluble resin, isopropanol and water, thereby forming the first passivation layer 510 and the second passivation layer 520 on both sides of the metal layer 200, respectively.

[0046] Please see Figure 1 The present invention also proposes a method for preparing an aluminum-plastic film for batteries, comprising the following steps: S10. A nylon layer 100 is provided on one side of the metal layer 200; S20. The CPP layer 300 is disposed on the other side of the metal layer 200 by lamination or extrusion coating. After aging, the aluminum-plastic film for battery is obtained.

[0047] The CPP layer 300 is placed on the metal layer 200 by extrusion coating, so that the CPP layer 300 is stably bonded to the metal layer 200, and the aluminum-plastic film for battery has a good barrier effect.

[0048] It is understandable that in step S20, the existing lamination method can be used to prepare the CPP layer 300, while the extrusion coating method can be used to prepare the CPP layer 300 on the metal layer 200 by adopting a three-layer co-extrusion casting method according to the amount of thermal conductive additive in this application.

[0049] In one embodiment, before the step of setting the nylon layer 100 or CPP layer 300 on the metal layer 200, the following step is further included: S30. A first passivation solution and a second passivation solution are applied to one side of the cleaned metal layer 200 to form a first passivation layer 510 on one side of the metal layer 200 and a second passivation layer 520 on the other side of the metal layer 200; wherein the coating time is 2-10s and the drying temperature is 100-260℃. S40. A first thermally conductive adhesive is applied to the surface of the first passivation layer 510 to form a first thermally conductive adhesive layer 410 for the nylon layer 100 to be covered; the drying temperature of the coating is 50-130°C. S50. A second thermally conductive adhesive is applied to the surface of the second passivation layer 520 to form a second thermally conductive adhesive layer 420 for the CPP layer 300 to cover; the drying temperature of the coating is 40-100°C.

[0050] In step S30, the metal layer 200 undergoes pretreatment steps such as alkaline washing to remove oil, water washing, and acid washing to neutralize, resulting in a clean metal layer 200. A first passivation solution is applied to the matte surface (if any) of the metal layer 200 to form a first passivation layer 510; a second passivation solution is applied to the glossy surface of the metal layer 200 to form a second passivation layer 520. The coating time is 2-10 seconds, and the drying temperature is 100-260℃.

[0051] In step S40, a first thermally conductive adhesive is applied to the first passivation layer 510, and the drying temperature of the application is 50-130°C to form the first thermally conductive adhesive layer 410. After the first thermally conductive adhesive layer 410 is formed, the nylon layer 100 can be laminated onto the surface of the first thermally conductive adhesive layer 410 using a laminating machine at a lamination temperature of 50-80°C.

[0052] In step S50, a second thermally conductive adhesive is applied to the second passivation layer 520, and the application is dried at a temperature of 40-100°C to form the second thermally conductive adhesive layer 420. After the second thermally conductive adhesive layer 420 is formed, the CPP layer 300 can be deposited on the surface of the second thermally conductive adhesive layer 420 by lamination or extrusion coating to achieve interlayer bonding.

[0053] In one embodiment, after the CPP layer 300 is formed, aging is performed under conditions of 50-100°C for 2-7 days. By aging it in an environment of 50-85°C for 2-7 days, an aluminum-plastic film for batteries is obtained.

[0054] The present invention also proposes a battery comprising an aluminum-plastic film for the battery, which is described in the above embodiments. Since the present battery adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0055] In one embodiment, the battery includes a secondary battery comprising the aforementioned aluminum-plastic film for batteries.

[0056] In one embodiment, the battery includes a lithium battery.

[0057] In one embodiment, the secondary battery further includes a positive electrode, a negative electrode, an electrolyte, and a separator.

[0058] The present invention also proposes an electrical device, which includes a battery, the battery including the aforementioned aluminum-plastic film for batteries.

[0059] This application does not impose any particular limitation on the electrical device used, as long as it can achieve the purpose of this application. The electrical device used in this application can be any electrical device known in the prior art. For example, the electrical device can include, but is not limited to, at least one of the following: laptop computer, pen input computer, mobile computer, e-book player, portable telephone, portable fax machine, portable copier, portable printer, headset stereo, video recorder, LCD TV, portable cleaner, floor scrubber, cleaning robot, portable CD player, mini CD, transceiver, electronic notebook, calculator, memory card, portable recorder, radio, backup power supply, motor, automobile, motorcycle, electric bicycle, bicycle, lighting fixture, toy, game console, clock, power tool, flash, and camera.

[0060] The embodiments of the present invention will be described in detail below with reference to specific examples. However, those skilled in the art will understand that the following examples are for illustrative purposes only and should not be considered as limiting the scope of the invention. Unless otherwise specified in the examples, conventional conditions or conditions recommended by the manufacturer are followed. Reagents or instruments whose manufacturers are not specified are all commercially available products. Example 1

[0061] A soft-pack lithium battery packaging aluminum-plastic film includes a nylon layer, a first thermally conductive adhesive layer, a first passivation layer, an aluminum foil layer, a second passivation layer, a second thermally conductive adhesive layer, and a CPP layer stacked sequentially. The preparation process includes the following steps: A first passivation solution is uniformly coated on the matte surface of a cleaned aluminum foil layer, and a second passivation solution is uniformly coated on the glossy surface of the cleaned aluminum foil layer, wherein the thickness of the aluminum foil layer is 55 μm. Then, it is dried in a 200℃ oven to form a first passivation layer and a second passivation layer, each 100 nm in size. A first thermally conductive adhesive layer is coated on the first passivation layer. The first thermally conductive adhesive layer is made of thermally conductive modified polyurethane resin (containing 25% (w / w) of isocyanate curing agent, the isocyanate curing agent being hexamethylene diisocyanate). The coating temperature is 60-120℃, the drying time is 6s, and the thickness is 4μm. A nylon layer is laminated on the first thermally conductive layer at a lamination temperature of 80℃, and the thickness of the nylon layer is 15μm. A second thermally conductive adhesive layer is coated on the second passivation layer. The second thermally conductive adhesive layer uses a thermally conductive modified polyolefin adhesive (containing 3% (w / w) of epoxy system curing agent, which is epoxy resin with alicyclic amine modified curing agent). The coating temperature is 80-110℃, the drying time is 6s, and the thickness is 3μm. A CPP layer is laminated on the second thermally conductive adhesive layer at a lamination temperature of 80℃, and the CPP layer thickness is 20μm. The CPP layer includes an adhesive layer, an intermediate layer, and a heat-sealing layer, with a ratio of adhesive layer: intermediate layer: heat-sealing layer = 1:3:1. The thermally conductive additive added to the intermediate layer includes aluminum nitride, with a proportion of 5% (w / w) of the intermediate layer. The aluminum-plastic film for batteries was obtained by aging at 70°C for 4 days.

[0062] The first passivation solution comprises 5 wt% nitrate, 1 wt% chromium salt, 8 wt% water-soluble resin, 9% isopropanol and 77 wt% water, and the second passivation solution comprises 8 wt% nitrate, 1.6 wt% chromium salt, 12 wt% water-soluble resin, 8% isopropanol and 70.4 wt% water. Example 2

[0063] A soft-pack lithium battery packaging aluminum-plastic film includes a nylon layer, a first thermally conductive adhesive layer, a first passivation layer, an aluminum foil layer, a second passivation layer, a second thermally conductive adhesive layer, and a CPP layer stacked sequentially. The preparation process includes the following steps: A first passivation solution is uniformly coated on the matte surface of a cleaned aluminum foil layer, and a second passivation solution is uniformly coated on the glossy surface of the cleaned aluminum foil layer, wherein the thickness of the aluminum foil layer is 55 μm. Then, it is dried in a 200℃ oven to form a first passivation layer and a second passivation layer, each 100 nm in size. A first thermally conductive adhesive layer is coated on the first passivation layer. The first thermally conductive adhesive layer is made of thermally conductive modified polyurethane resin (containing 25% (w / w) of isocyanate curing agent, the isocyanate curing agent being hexamethylene diisocyanate). The coating temperature is 60-120℃, the drying time is 6s, and the thickness is 4μm. A nylon layer is laminated on the first thermally conductive layer at a lamination temperature of 80℃, and the thickness of the nylon layer is 15μm. A second thermally conductive adhesive layer is coated on the second passivation layer. The second thermally conductive adhesive layer uses a thermally conductive modified polyolefin adhesive (containing 3% (w / w) of epoxy system curing agent, which is epoxy resin with alicyclic amine modified curing agent). The coating temperature is 80-110℃, the drying time is 6s, and the thickness is 3μm. A CPP layer is laminated on the second thermally conductive adhesive layer at a lamination temperature of 80℃, and the CPP layer thickness is 20μm. The CPP layer includes an adhesive layer, an intermediate layer, and a heat-sealing layer, with a ratio of adhesive layer: intermediate layer: heat-sealing layer = 1:3:1. The thermally conductive additive added to the intermediate layer includes boron nitride, with a proportion of 5% (w / w) of the intermediate layer. The aluminum-plastic film for batteries was obtained by aging at 70°C for 4 days.

[0064] The first passivation solution and the second passivation solution are the same as in Example 1. Example 3

[0065] A soft-pack lithium battery packaging aluminum-plastic film includes a nylon layer, a first thermally conductive adhesive layer, a first passivation layer, an aluminum foil layer, a second passivation layer, a second thermally conductive adhesive layer, and a CPP layer stacked sequentially. The preparation process includes the following steps: A first passivation solution is uniformly coated on the matte surface of a cleaned aluminum foil layer, and a second passivation solution is uniformly coated on the glossy surface of the cleaned aluminum foil layer, wherein the thickness of the aluminum foil layer is 55 μm. Then, it is dried in a 200℃ oven to form a first passivation layer and a second passivation layer, each 100 nm in size. A first thermally conductive adhesive layer is coated on the first passivation layer. The first thermally conductive adhesive layer is made of thermally conductive modified polyurethane resin (containing 25% (w / w) of isocyanate curing agent, the isocyanate curing agent being hexamethylene diisocyanate). The coating temperature is 60-120℃, the drying time is 6s, and the thickness is 4μm. A nylon layer is laminated on the first thermally conductive layer at a lamination temperature of 80℃, and the thickness of the nylon layer is 15μm. A second thermally conductive adhesive layer is coated on the second passivation layer. The second thermally conductive adhesive layer uses a thermally conductive modified polyolefin adhesive (containing 3% (w / w) of epoxy system curing agent, which is epoxy resin with alicyclic amine modified curing agent). The coating temperature is 80-110℃, the drying time is 6s, and the thickness is 3μm. A CPP layer is laminated on the second thermally conductive adhesive layer at a lamination temperature of 80℃, and the CPP layer thickness is 20μm. The CPP layer includes an adhesive layer, an intermediate layer, and a heat-sealing layer, with a ratio of adhesive layer: intermediate layer: heat-sealing layer = 1:3:1. The thermally conductive additive added to the intermediate layer includes alumina, with a proportion of 5% (w / w) of the intermediate layer. The aluminum-plastic film for batteries was obtained by aging at 70°C for 4 days.

[0066] The first passivation solution and the second passivation solution are the same as in Example 1. Example 4

[0067] A soft-pack lithium battery packaging aluminum-plastic film includes a nylon layer, a first thermally conductive adhesive layer, a first passivation layer, an aluminum foil layer, a second passivation layer, a second thermally conductive adhesive layer, and a CPP layer stacked sequentially. The preparation process includes the following steps: A first passivation solution is uniformly coated on the matte surface of a cleaned aluminum foil layer, and a second passivation solution is uniformly coated on the glossy surface of the cleaned aluminum foil layer, wherein the thickness of the aluminum foil layer is 55 μm. Then, it is dried in a 200℃ oven to form a first passivation layer and a second passivation layer, each 100 nm in size. A first thermally conductive adhesive layer is coated on the first passivation layer. The first thermally conductive adhesive layer is made of thermally conductive modified polyurethane resin (containing 25% (w / w) of isocyanate curing agent, the isocyanate curing agent being hexamethylene diisocyanate). The coating temperature is 60-120℃, the drying time is 6s, and the thickness is 4μm. A nylon layer is laminated on the first thermally conductive layer at a lamination temperature of 80℃, and the thickness of the nylon layer is 15μm. A second thermally conductive adhesive layer is coated on the second passivation layer. The second thermally conductive adhesive layer uses a thermally conductive modified polyolefin adhesive (containing 3% (w / w) of epoxy system curing agent, which is epoxy resin with alicyclic amine modified curing agent). The coating temperature is 80-110℃, the drying time is 6s, and the thickness is 3μm. A CPP layer is laminated on the second thermally conductive adhesive layer at a lamination temperature of 80℃, and the CPP layer thickness is 20μm. The CPP layer includes an adhesive layer, an intermediate layer, and a heat-sealing layer, with a ratio of adhesive layer: intermediate layer: heat-sealing layer = 1:3:1. The thermally conductive additive added to the intermediate layer includes aluminum nitride, with a proportion of 10% (w / w) of the intermediate layer. The aluminum-plastic film for batteries was obtained by aging at 70°C for 4 days.

[0068] The first passivation solution and the second passivation solution are the same as in Example 1. Example 5

[0069] A soft-pack lithium battery packaging aluminum-plastic film includes a nylon layer, a first thermally conductive adhesive layer, a first passivation layer, an aluminum foil layer, a second passivation layer, a second thermally conductive adhesive layer, and a CPP layer stacked sequentially. The preparation process includes the following steps: A first passivation solution is uniformly coated on the matte surface of a cleaned aluminum foil layer, and a second passivation solution is uniformly coated on the glossy surface of the cleaned aluminum foil layer, wherein the thickness of the aluminum foil layer is 55 μm. Then, it is dried in a 200℃ oven to form a first passivation layer and a second passivation layer, each 100 nm in size. A first thermally conductive adhesive layer is coated on the first passivation layer. The first thermally conductive adhesive layer is made of thermally conductive modified polyurethane resin (containing 25% (w / w) of isocyanate curing agent, the isocyanate curing agent being hexamethylene diisocyanate). The coating temperature is 60-120℃, the drying time is 6s, and the thickness is 4μm. A nylon layer is laminated on the first thermally conductive layer at a lamination temperature of 80℃, and the thickness of the nylon layer is 15μm. A second thermally conductive adhesive layer is coated on the second passivation layer. The second thermally conductive adhesive layer uses a thermally conductive modified polyolefin adhesive (containing 3% (w / w) of epoxy system curing agent, which is epoxy resin with alicyclic amine modified curing agent). The coating temperature is 80-110℃, the drying time is 6s, and the thickness is 3μm. A CPP layer is laminated on the second thermally conductive adhesive layer at a lamination temperature of 80℃, and the CPP layer thickness is 40μm. The CPP layer includes an adhesive layer, an intermediate layer, and a heat-sealing layer, with a ratio of adhesive layer: intermediate layer: heat-sealing layer = 1:3:1. The thermally conductive additive added to the intermediate layer includes aluminum nitride, with a proportion of 5% (w / w) of the intermediate layer. The aluminum-plastic film for batteries was obtained by aging at 70°C for 4 days.

[0070] The first passivation solution and the second passivation solution are the same as in Example 1. Example 6

[0071] A soft-pack lithium battery packaging aluminum-plastic film includes a nylon layer, a first thermally conductive adhesive layer, a first passivation layer, an aluminum foil layer, a second passivation layer, a second thermally conductive adhesive layer, and a CPP layer stacked sequentially. The preparation process includes the following steps: A first passivation solution is uniformly coated on the matte surface of a cleaned aluminum foil layer, and a second passivation solution is uniformly coated on the glossy surface of the cleaned aluminum foil layer, wherein the thickness of the aluminum foil layer is 55 μm. Then, it is dried in a 200℃ oven to form a first passivation layer and a second passivation layer, each 100 nm in size. A first thermally conductive adhesive layer is coated on the first passivation layer. The first thermally conductive adhesive layer is made of thermally conductive modified polyurethane resin (containing 25% (w / w) of isocyanate curing agent, the isocyanate curing agent being hexamethylene diisocyanate). The coating temperature is 60-120℃, the drying time is 6s, and the thickness is 4μm. A nylon layer is laminated on the first thermally conductive layer at a lamination temperature of 80℃, and the thickness of the nylon layer is 15μm. A second thermally conductive adhesive layer is coated on the second passivation layer. The second thermally conductive adhesive layer uses a thermally conductive modified polyolefin adhesive (containing 3% (w / w) of epoxy system curing agent, which is epoxy resin with alicyclic amine modified curing agent). The coating temperature is 80-110℃, the drying time is 6s, and the thickness is 3μm. A CPP layer is laminated on the second thermally conductive adhesive layer at a lamination temperature of 80℃, and the CPP layer thickness is 20μm. The CPP layer includes an adhesive layer, an intermediate layer, and a heat-sealing layer, with a ratio of adhesive layer: intermediate layer: heat-sealing layer = 1:4:1. The thermally conductive additive added to the intermediate layer includes aluminum nitride, with a proportion of 3% (w / w) of the intermediate layer. The aluminum-plastic film for batteries was obtained by aging at 70°C for 4 days.

[0072] The first passivation solution and the second passivation solution are the same as in Example 1. Example 7

[0073] A soft-pack lithium battery packaging aluminum-plastic film includes a nylon layer, a first thermally conductive adhesive layer, a first passivation layer, an aluminum foil layer, a second passivation layer, a second thermally conductive adhesive layer, and a CPP layer stacked sequentially. The preparation process includes the following steps: A first passivation solution is uniformly coated on the matte surface of a cleaned aluminum foil layer, and a second passivation solution is uniformly coated on the glossy surface of the cleaned aluminum foil layer, wherein the thickness of the aluminum foil layer is 55 μm. Then, it is dried in a 200℃ oven to form a first passivation layer and a second passivation layer, each 100 nm in size. A first thermally conductive adhesive layer is coated on the first passivation layer. The first thermally conductive adhesive layer is made of thermally conductive modified polyurethane resin (containing 25% (w / w) of isocyanate curing agent, the isocyanate curing agent being hexamethylene diisocyanate). The coating temperature is 60-120℃, the drying time is 6s, and the thickness is 4μm. A nylon layer is laminated on the first thermally conductive layer at a lamination temperature of 80℃, and the thickness of the nylon layer is 15μm. A second thermally conductive adhesive layer is coated on the second passivation layer. The second thermally conductive adhesive layer uses a thermally conductive modified polyolefin adhesive (containing 3% (w / w) of epoxy system curing agent, which is epoxy resin with alicyclic amine modified curing agent). The coating temperature is 80-110℃, the drying time is 6s, and the thickness is 3μm. A CPP layer is laminated on the second thermally conductive adhesive layer at a lamination temperature of 80℃, and the CPP layer thickness is 20μm. The CPP layer includes an adhesive layer, an intermediate layer, and a heat-sealing layer, with the ratio of adhesive layer: intermediate layer: heat-sealing layer = 1:2:1. The thermally conductive additive added to the intermediate layer includes aluminum nitride, with a proportion of 20% (w / w) of the intermediate layer. The aluminum-plastic film for batteries was obtained by aging at 70°C for 4 days.

[0074] The first passivation solution and the second passivation solution are the same as in Example 1. Example 8

[0075] A soft-pack lithium battery packaging aluminum-plastic film includes a nylon layer, a first thermally conductive adhesive layer, a first passivation layer, an aluminum foil layer, a second passivation layer, a second thermally conductive adhesive layer, and a CPP layer stacked sequentially. The preparation process includes the following steps: A first passivation solution is uniformly coated on the matte surface of a cleaned aluminum foil layer, and a second passivation solution is uniformly coated on the glossy surface of the cleaned aluminum foil layer, wherein the thickness of the aluminum foil layer is 55 μm. Then, it is dried in a 200℃ oven to form a first passivation layer and a second passivation layer, each 100 nm in size. A first thermally conductive adhesive layer is coated on the first passivation layer. The first thermally conductive adhesive layer is made of thermally conductive modified polyurethane resin (containing 25% (w / w) of isocyanate curing agent, the isocyanate curing agent being hexamethylene diisocyanate). The coating temperature is 60-120℃, the drying time is 6s, and the thickness is 4μm. A nylon layer is laminated on the first thermally conductive layer at a lamination temperature of 80℃, and the thickness of the nylon layer is 15μm. A second thermally conductive adhesive layer is coated on the second passivation layer. The second thermally conductive adhesive layer uses a thermally conductive modified polyolefin adhesive (containing 3% (w / w) of epoxy system curing agent, which is epoxy resin with alicyclic amine modified curing agent). The coating temperature is 80-110℃, the drying time is 6s, and the thickness is 3μm. A CPP layer is laminated on the second thermally conductive adhesive layer at a lamination temperature of 80℃, and the CPP layer thickness is 50μm. The CPP layer includes an adhesive layer, an intermediate layer, and a heat-sealing layer, with a ratio of adhesive layer: intermediate layer: heat-sealing layer = 1:2:1. The thermally conductive additive added to the intermediate layer includes aluminum nitride, which accounts for 20% (w / w) of the intermediate layer. The aluminum-plastic film for batteries was obtained by aging at 70°C for 4 days.

[0076] The first passivation solution and the second passivation solution are the same as in Example 1.

[0077] Comparative Example 1 A soft-pack lithium battery packaging aluminum-plastic film includes a nylon layer, a first thermally conductive adhesive layer, a first passivation layer, an aluminum foil layer, a second passivation layer, a second thermally conductive adhesive layer, and a CPP layer stacked sequentially. The preparation process includes the following steps: A first passivation solution is uniformly coated on the matte surface of a cleaned aluminum foil layer, and a second passivation solution is uniformly coated on the glossy surface of the cleaned aluminum foil layer, wherein the thickness of the aluminum foil layer is 55 μm. Then, it is dried in a 200℃ oven to form a first passivation layer and a second passivation layer, each 100 nm in size. A first thermally conductive adhesive layer is coated on the first passivation layer. The first thermally conductive adhesive layer is made of thermally modified polyurethane resin (containing 25% (w / w) of isocyanate curing agent, which is hexamethylene diisocyanate). The coating temperature is 60-120℃, the drying time is 6 hours, and the thickness is 4μm. A nylon layer is laminated on the first thermally conductive layer at a lamination temperature of 80℃, and the thickness of the nylon layer is 15μm. A second thermally conductive adhesive layer is coated on the second passivation layer. The second thermally conductive adhesive layer uses a thermally conductive modified polyolefin adhesive (containing 3% (w / w) of epoxy system curing agent, which is epoxy resin with alicyclic amine modified curing agent). The coating temperature is 80-110℃, the drying time is 6s, and the thickness is 3μm. A CPP layer is laminated on the second thermally conductive adhesive layer at a lamination temperature of 80℃. The thickness of the CPP layer is 20μm. The CPP layer includes an adhesive layer, an intermediate layer, and a heat-sealing layer in a ratio of adhesive layer: intermediate layer: heat-sealing layer = 1:3:1. No thermally conductive additives are added to the intermediate layer. The aluminum-plastic film for batteries was obtained by aging at 70°C for 4 days.

[0078] The first passivation solution and the second passivation solution are the same as in Example 1.

[0079] Comparative Example 2 A soft-pack lithium battery packaging aluminum-plastic film includes a nylon layer, a first adhesive layer, a first passivation layer, an aluminum foil layer, a second passivation layer, a second adhesive layer, and a CPP layer stacked sequentially. The preparation process includes the following steps: A first passivation solution is uniformly coated on the matte surface of a cleaned aluminum foil layer, and a second passivation solution is uniformly coated on the glossy surface of the cleaned aluminum foil layer, wherein the thickness of the aluminum foil layer is 55 μm. Then, it is dried in a 200℃ oven to form a first passivation layer and a second passivation layer, each 100 nm in size. A first adhesive layer is applied on the first passivation layer. The first adhesive layer uses a polyurethane adhesive (which is a two-component polyurethane adhesive) and has a thickness of 4 μm. A nylon layer is laminated on the first thermally conductive layer at a lamination temperature of 80℃, and the thickness of the nylon layer is 15μm. A second adhesive layer is coated on the second passivation layer. The second adhesive layer uses a modified polyolefin adhesive (the modified polyolefin adhesive is a maleic anhydride-grafted polyolefin adhesive) and has a thickness of 3 μm. A CPP layer is laminated on the second adhesive layer at a lamination temperature of 80℃, and the CPP layer thickness is 20μm. The CPP layer includes an adhesive layer, an intermediate layer, and a heat-sealing layer, with a ratio of adhesive layer: intermediate layer: heat-sealing layer = 1:3:1. The thermally conductive additive added to the intermediate layer includes aluminum nitride, with a proportion of 5% (w / w) of the intermediate layer. The aluminum-plastic film for batteries was obtained by aging at 70°C for 4 days.

[0080] The first passivation solution and the second passivation solution are the same as in Example 1.

[0081] Comparative Example 3 A soft-pack lithium battery packaging aluminum-plastic film includes a nylon layer, a first adhesive layer, a first passivation layer, an aluminum foil layer, a second passivation layer, a second adhesive layer, and a CPP layer stacked sequentially. The preparation process includes the following steps: A first passivation solution is uniformly coated on the matte surface of a cleaned aluminum foil layer, and a second passivation solution is uniformly coated on the glossy surface of the cleaned aluminum foil layer, wherein the thickness of the aluminum foil layer is 55 μm. Then, it is dried in a 200℃ oven to form a first passivation layer and a second passivation layer, each 100 nm in size. A first adhesive layer is applied on the first passivation layer. The first adhesive layer uses a polyurethane adhesive (which is a two-component polyurethane adhesive) and has a thickness of 4 μm. A nylon layer is laminated on the first thermally conductive layer at a lamination temperature of 80℃, and the thickness of the nylon layer is 15μm. A second adhesive layer is coated on the second passivation layer. The second adhesive layer uses a modified polyolefin adhesive (the modified polyolefin adhesive is a maleic anhydride-grafted polyolefin adhesive) and has a thickness of 3 μm. A CPP layer is laminated on the second adhesive layer at a lamination temperature of 80℃. The CPP layer has a thickness of 20μm. The CPP layer consists of an adhesive layer, an intermediate layer, and a heat-sealing layer in a ratio of adhesive layer: intermediate layer: heat-sealing layer = 1:3:1. No thermally conductive additives are added to the intermediate layer. The aluminum-plastic film for batteries was obtained by aging at 70°C for 4 days.

[0082] The first passivation solution and the second passivation solution are the same as in Example 1.

[0083] The parameters of the CPP layer and adhesive layer in the above embodiments and comparative examples are shown in Table 1.

[0084] Table 1. Composition and dosage of the examples and comparative examples

[0085] Using the above-described embodiments and comparative examples, and purchasing three competing products from the market as competitors 1-3, their product performance was tested using the following testing methods. The test results are shown in Table 2.

[0086] The method for determining thermal conductivity is as follows: First, the density of the prepared composite material is tested using a density balance, following the method in GB / T6343-95. Then, the specific heat value of the unknown sample is calculated by comparing the measurement results of a standard sample (alumina) with a known specific heat with those of the sample to be tested, using a differential scanning calorimeter. Finally, the thermal diffusivity of the sample is measured using a laser thermal conductivity meter, according to the ASTM E1461 standard. The thermal conductivity of the sample is then calculated using the measured sample density and specific heat.

[0087] Adhesion test method: Cut the aluminum-plastic film into 15mm (TD) × 100mm (MD) and 15mm (MD) × 100mm (TD) sizes. Slowly pull the PP film to separate it from the AL film. Apply adhesive tape to the entire peeled inner film and secure it. Then, use double-sided tape to attach it to a glass slide. Adjust the UTM fixture gap to 80mm. Install the prepared sample on the fixture, adjust the measurement speed to 200mm / min, and the peel angle to 180°. Measure the AL / PP composite strength over a 30mm section and obtain the average value of the flat portion.

[0088] Electrolyte corrosion resistance test method: Cut aluminum-plastic film samples into 25mm (TD) × 100mm (MD) and 15mm (MD) × 100mm (TD) pieces, and place them together with 250mL of electrolyte (electrolyte composition: EC:DEC:DMC = 1:1:1 + 1mol / L lithium hexafluorophosphate, with 2000ppm water added, where EC is ethylene carbonate, DEC is diethyl carbonate, and DMC is dimethyl carbonate) in a PE bottle and seal it with paraffin film. Store it in an 85℃ test chamber for 15 days. After 15 days, remove the samples from the PE bottle, immediately remove the electrolyte from the surface, and cut both ends of the samples to achieve 15mm (TD) × 100mm (MD) and 15mm (MD) × 100mm (TD) sizes. After adjusting the UTM clamp gap to 80mm, install the cut samples on the clamp, adjust the measurement speed to 200mm / min, and the peeling angle to 180°. Measure the strength of the AL / PP (after EL) composite over a 30mm section and obtain the average value of the flat portion.

[0089] Heat resistance test method: Cut the aluminum-plastic film into 15mm (TD) × 100mm (MD) and 15mm (MD) × 100mm (TD) sizes. Then, slowly pull the PP to separate it from the AL. Apply adhesive tape to the entire peeled inner film and fix it in place. Then, use double-sided tape to stick it to a glass slide. Set the chamber temperature to 120℃ and wait 30 minutes for the temperature to stabilize. After adjusting the UTM fixture gap to 80mm, install the prepared sample on the fixture, adjust the measurement speed to 200mm / min, and the peeling angle to 180°. Close the chamber door and wait 5 minutes for the temperature to stabilize. Measure the AL / PP composite strength over 30mm and obtain the average value of the flat portion.

[0090] Table 2 Performance Test Results

[0091] As shown in Tables 1 and 2, thermally conductive additives were added to the intermediate layer of the CPP layer in Examples 1 to 8. The content of the thermally conductive additives in the intermediate layer, as well as the thickness ratio of the adhesive layer, intermediate layer, and heat-sealing layer of the CPP layer, are all within the range of this application. At the same time, a first thermally conductive adhesive layer and a second thermally conductive adhesive layer were provided. The thermal conductivity of Examples 1 to 8 was measured to be 0.304-0.849 W / (m·K), which is much greater than the thermal conductivity of competing products 1 to 3 in the market (0.096-0.163 W / (m·K), indicating that the aluminum-plastic film for batteries in this application has excellent thermal conductivity.

[0092] Compared to Example 1, Comparative Example 1 did not add a thermally conductive additive to its intermediate layer, and its thermal conductivity was 0.159 W / (m·K), which was not much different from Competitor 3, but only half that of Example 1. Comparative Example 2 added a thermally conductive additive to its intermediate layer. The amount of the thermally conductive additive and the thickness ratio of the three layers in the CPP layer were within the range of this application. Although a non-thermally conductive adhesive was used, its thermal conductivity was still 0.264 W / (m·K), indicating that the amount of thermally conductive additive and the thickness ratio of the three layers in the CPP layer significantly improved the thermal conductivity. Comparative Example 3, based on Comparative Example 2, did not add a thermally conductive additive to its intermediate layer, and its thermal conductivity was 0.094 W / (m·K), with a rapid decrease in electrical conductivity. This further demonstrates that the amount of thermally conductive additive and the thickness ratio of the three layers in the CPP layer in this application can improve the thermal conductivity and increase the electrical conductivity of the aluminum-plastic film for batteries.

[0093] Regarding adhesive performance, the peel strength of commercially available competing products 1 to 3 is 9.029-9.145 N / 15mm, and the peel strength of Examples 1 to 8 is 9.299-16.194 N / 15mm, indicating that the aluminum-plastic film of this application achieves adhesive performance comparable to or even better than that of commercially available competing products; it has strong interlayer bonding, is not easily separated between layers, and has a good adhesive effect.

[0094] Regarding the resistance to electrolyte corrosion, the electrolyte peel strength of commercially available competing products 1 to 3 is about 6.2 N / 15mm, while the electrolyte peel strength of Examples 1 to 8 is greater than 6.5 N / 15mm, with Example 8 reaching as high as 14.397 N / 15mm. This indicates that the aluminum-plastic film of this application has high adhesive strength and strong resistance to electrolyte corrosion.

[0095] Regarding heat resistance, the high-temperature peel strength of commercially available competing products 1 to 3 is 0.549-1.019 N / 15mm, while the high-temperature peel strength of Examples 1 to 8 is all above 2 N / 15mm. Their high-temperature peel strength is much higher than that of commercially available competing products, indicating that the aluminum-plastic film of this application can still maintain good adhesion performance in high-temperature environments.

[0096] In summary, the aluminum-plastic film of this application has good thermal conductivity, while also retaining good adhesion, heat resistance, and resistance to electrolyte corrosion.

[0097] Unless otherwise specified, the raw materials and equipment used in this invention are commonly used in the field; the methods used in this invention are conventional methods in the field. Unless otherwise specified, the meanings of the terms in this specification are the same as those generally understood by those skilled in the art, but in case of conflict, the definitions in this specification shall prevail.

[0098] The foregoing examples are merely illustrative, used to explain some features of the method described in this invention. The appended claims are intended to claim the broadest possible scope, and the embodiments presented herein are merely illustrative of selected implementations based on combinations of all possible embodiments. Therefore, the applicant intends that the appended claims are not limited by the selection of examples illustrating the features of the invention. Some numerical ranges used in the claims also include sub-ranges within them, and variations within these ranges should also be interpreted as being covered by the appended claims where possible.

Claims

1. An aluminum-plastic film for batteries, characterized in that, The aluminum-plastic film comprises a nylon layer, a metal layer, and a CPP layer stacked sequentially. The CPP layer comprises an adhesive layer, an intermediate layer, and a heat-sealing layer stacked sequentially. The intermediate layer contains a thermally conductive agent. The thickness ratio of the adhesive layer, the intermediate layer, and the heat-sealing layer is 1:(1.5-4.0):

1. The amount of the thermally conductive agent relative to the intermediate layer is 0.5%-20% (w / w).

2. The aluminum-plastic film for batteries as described in claim 1, characterized in that, The thermally conductive additive includes one or more of boron nitride, aluminum nitride, silicon nitride, aluminum oxide, and zinc oxide; and / or, The thickness of the CPP layer is 10-150 μm.

3. The aluminum-plastic film for batteries as described in claim 2, characterized in that, The aluminum-plastic film also includes a first thermally conductive adhesive layer located between the nylon layer and the metal layer, the first thermally conductive adhesive layer comprising a thermally conductive modified polyurethane adhesive or a thermally conductive modified isocyanate adhesive. The aluminum-plastic film further includes a second thermally conductive adhesive layer located between the metal layer and the CPP layer, the second thermally conductive adhesive layer comprising a thermally conductive modified polyolefin adhesive.

4. The aluminum-plastic film for batteries as described in claim 3, characterized in that, The first thermally conductive adhesive layer contains 15-45% (w / w) of an isocyanate-based curing agent; and / or, The thermally modified polyolefin adhesive comprises a thermally modified maleic anhydride-grafted polyolefin, wherein the thermally modified maleic anhydride-grafted polyolefin contains 1-10% (w / w) of an epoxy-based curing agent; and / or, The thickness of the first thermally conductive adhesive layer and / or the second thermally conductive adhesive layer is 1-10 μm.

5. The aluminum-plastic film for batteries as described in claim 4, characterized in that, The isocyanate curing agent includes one or more of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate; and / or The epoxy curing agent includes one or more of the following: epoxy resin modified with alicyclic amines, epoxy resin modified with phenolic amino alcohols, and epoxy resin modified with polyamides; and / or, The thickness of the first thermally conductive adhesive layer and / or the second thermally conductive adhesive layer is 1-5 μm.

6. The aluminum-plastic film for batteries as described in any one of claims 3 to 5, characterized in that, A first passivation layer is provided between the metal layer and the first thermally conductive adhesive layer, the thickness of the first passivation layer being 10-100 nm; and / or, A second passivation layer is provided between the metal layer and the second thermally conductive adhesive layer, the thickness of the second passivation layer being 10-100 nm; and / or, The metal layer includes an aluminum foil layer with a thickness of 20-65 μm; and / or, The material of the nylon layer includes nylon 66, and the thickness of the nylon layer is 5-35 μm.

7. A method for preparing an aluminum-plastic film for batteries as described in any one of claims 1 to 6, characterized in that, Includes the following steps: A nylon layer is placed on one side of the metal layer; The CPP layer is placed on the other side of the metal layer by lamination or extrusion coating. After aging, the aluminum-plastic film for the battery is obtained.

8. The method for preparing the aluminum-plastic film for batteries as described in claim 7, characterized in that, Before the step of setting the nylon layer or CPP layer on the metal layer, the following steps are also included: A first passivation solution and a second passivation solution are applied to one side of the cleaned metal layer to form a first passivation layer on one side of the metal layer and a second passivation layer on the other side of the metal layer; wherein the coating time is 2-10s and the drying temperature is 100-260℃. A first thermally conductive adhesive is applied to the surface of the first passivation layer to form a first thermally conductive adhesive layer for the nylon layer to cover; the drying temperature of the coating is 50-130°C. A second thermally conductive adhesive is applied to the surface of the second passivation layer to form a second thermally conductive adhesive layer that is covered by the CPP layer; the drying temperature of the coating is 40-100°C. And / or, the aging conditions are 50-100°C for 2-7 days.

9. A battery, characterized in that, Includes the aluminum-plastic film for batteries as described in any one of claims 1 to 6.

10. An electrical appliance, characterized in that, Includes the battery as described in claim 8.

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