A power bank shell

Abstract

The application discloses a power bank shell and relates to the technical field of battery safety. The power bank shell comprises a shell body and a functional layer. The functional layer is arranged on the inner side of the shell body. The functional layer comprises a first functional layer and a second functional layer. The first functional layer is arranged between the shell body and the second functional layer. Both the first functional layer and the second functional layer comprise perfluorocyclohexanone microcapsules. The mass percentage of the perfluorocyclohexanone microcapsules in the first functional layer is less than that in the second functional layer. The second functional layer close to the inner cavity of the shell has a higher concentration of perfluorocyclohexanone microcapsules, can quickly release a large amount of fire extinguishing agent when thermal runaway occurs, forms a high-concentration inhibition zone at the core of the fire source, and realizes rapid fire extinguishing. The first functional layer on the outer side has a lower concentration, can serve as a supplementary release source on the periphery to prevent the spread of flames, and can avoid excessive release under non-extreme high temperatures to cause resource waste or shell body bulging, thereby balancing the fire extinguishing intensity and structural stability in a limited space.

Description

Technical Field

[0001] This invention relates to the field of battery safety technology, and in particular to a power bank casing. Background Technology

[0002] Currently, with the widespread use of portable electronic devices, power banks (portable power supplies) have become an indispensable auxiliary device in people's daily lives. Existing power banks typically consist of lithium-ion battery cells, charge / discharge management circuitry, and a casing. The casing is mostly made of plastic or metal, primarily serving to provide structural support, protect the internal circuitry and battery cells, and enhance the aesthetic appeal.

[0003] During the use of power banks, due to the inherent chemical characteristics of lithium-ion batteries, the battery cells may experience thermal runaway under extreme conditions such as internal short circuits, overcharging, overheating, or physical impacts, leading to safety accidents such as smoke, fire, or even explosion. To address this safety hazard, existing technologies mostly focus on circuit-level protection, such as incorporating overcharge protection, over-discharge protection, overcurrent protection, and temperature protection chips on the circuit board, attempting to disconnect the circuit when the battery cell malfunctions.

[0004] However, circuit protection has certain limitations. When the battery cell has suffered internal short circuits or physical structural damage such as diaphragm rupture, circuit disconnection often cannot prevent the heat generated by the chemical reaction inside the cell from accumulating. Once the temperature rises to the ignition point, the battery cell and surrounding flammable materials will ignite. Therefore, how to improve the safety of power banks under high-temperature conditions has become an urgent technical problem to be solved in this field. Summary of the Invention

[0005] The main objective of this invention is to provide a power bank casing that improves the safety of power banks under high-temperature conditions.

[0006] To achieve the above objectives, the present invention provides a power bank casing, characterized in that it comprises: The shell; and, A functional layer is disposed inside the housing. The functional layer includes a first functional layer and a second functional layer. The first functional layer is disposed between the housing and the second functional layer. Both the first functional layer and the second functional layer include perfluorohexanone microcapsules. The mass percentage of perfluorohexanone microcapsules in the first functional layer is less than the mass percentage of perfluorohexanone microcapsules in the second functional layer.

[0007] In one embodiment, the mass percentage of perfluorohexanone microcapsules in the first functional layer is m1, and the mass percentage of perfluorohexanone microcapsules in the second functional layer is m2, with the difference between m2 and m1 being 5% to 15%.

[0008] In one embodiment, the perfluorohexanone microcapsules in the second functional layer comprise 40% to 60% by mass; and / or, The perfluorohexanone microcapsules in the second functional layer account for 45% to 75% of the total mass.

[0009] In one embodiment, the thickness of the functional layer is 0.1 mm to 3 mm; and / or, The thickness ratio of the first functional layer to the second functional layer is 1:(4~9); and / or, The thickness of the shell is 0.8mm to 2mm.

[0010] In one embodiment, the perfluorohexanone microcapsule has a core-shell structure, wherein the core of the core-shell structure is perfluorohexanone, and the shell of the core-shell structure is a non-porous polymer, wherein: The shell is formed of at least one resin selected from cross-linked polyvinyl acetate, ethyl vinyl acetate, polyvinyl alcohol, polyurea, polyurethane, polyester resin, epoxy resin, urea-formaldehyde resin, melamine-formaldehyde resin, phenolic resin, and resorcinol-formaldehyde resin; and / or, The thickness of the shell is 200 nm to 5 μm.

[0011] In one embodiment, the power bank casing further includes a heat insulation layer disposed between the casing and the functional layer, the heat insulation layer comprising at least one of aerogel felt, ceramic fiber, and mica sheet.

[0012] In one embodiment, the thickness of the insulation layer is 0.3 mm to 1 mm; and / or, The porosity of the insulation layer is 30% to 50%.

[0013] In one embodiment, the functional layer further includes an adhesive, the adhesive comprising a silane coupling agent modified adhesive, wherein: The silane coupling agent modified adhesive includes at least one of silane coupling agent modified epoxy resin and silane coupling agent modified polyurethane; and / or, The adhesive in the functional layer accounts for 25% to 60% of the total mass.

[0014] In one embodiment, the functional layer further includes a dispersant, an antioxidant, and an ultraviolet absorber, wherein: The dispersant in the functional layer comprises 0.1% to 1.5% by mass; and / or, The antioxidant in the functional layer accounts for 0.3% to 1% of the total mass; and / or, The mass percentage of the ultraviolet absorber in the functional layer is 0.2% to 0.8%.

[0015] In one embodiment, the material of the shell includes at least one of polymer materials, metal materials, composite materials, and natural materials.

[0016] In the technical solution of this invention, a functional layer is provided on the inner side of the casing, and the functional layer includes perfluorohexanone microcapsules. When the battery cell inside the power bank experiences thermal runaway due to a short circuit or physical damage, causing the internal temperature of the casing to rise sharply and reach a preset threshold, the functional layer on the inner side of the casing will be rapidly stimulated by heat, causing the microcapsules to rupture and quickly release perfluorohexanone fire extinguishing agent. This fire extinguishing agent can form a local high-concentration suppression environment in the battery cell and surrounding circuit area. Through physical heat absorption and chemical chain interruption reaction, it can extinguish the fire source in time or effectively suppress heat spread in the nascent stage of a fire. Furthermore, because the second functional layer is closer to the heat source of the battery cell and has a higher concentration of extinguishing agent, it can rapidly release a large amount of perfluorohexanone when the battery cell experiences thermal runaway. This creates a high-concentration suppression environment in the core area of ​​the fire, achieving rapid fire suppression. Meanwhile, the first functional layer, located on the outer side, has a lower concentration. On the one hand, it can act as a supplementary release source when heat is conducted outwards, delaying or preventing the flame from breaking through the casing. On the other hand, in non-extreme high-temperature conditions or in cases of localized microcapsule rupture, it can effectively avoid resource waste or casing bulging caused by excessive release of the outer extinguishing agent. Thus, it balances fire suppression intensity and structural stability within a limited space. This significantly improves the active protection efficiency of the power bank casing under extreme conditions. Therefore, the technical solution of this application can improve the safety of power banks under high-temperature conditions. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Where the manufacturers of reagents or instruments are not specified, they are all conventional products that can be purchased commercially. Furthermore, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, or solution B, or a solution where both A and B are satisfied simultaneously. In addition, 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 cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] During the use of power banks, due to the inherent chemical characteristics of lithium-ion batteries, the battery cells may experience thermal runaway under extreme conditions such as internal short circuits, overcharging, overheating, or physical impacts, leading to safety accidents such as smoke, fire, or even explosion. To address this safety hazard, existing technologies mostly focus on circuit-level protection, such as incorporating overcharge protection, over-discharge protection, overcurrent protection, and temperature protection chips on the circuit board, attempting to disconnect the circuit when the battery cell malfunctions.

[0019] However, circuit protection has certain limitations. When the battery cell has suffered internal short circuits or physical structural damage such as diaphragm rupture, circuit disconnection often cannot prevent the heat generated by the chemical reaction inside the cell from accumulating. Once the temperature rises to the ignition point, the battery cell and surrounding flammable materials will ignite. Therefore, how to improve the safety of power banks under high-temperature conditions has become an urgent technical problem to be solved in this field.

[0020] In view of this, the present invention proposes a power bank casing, the power bank casing including a shell and a functional layer, the functional layer being disposed inside the shell, the functional layer including a first functional layer and a second functional layer, the first functional layer being disposed between the shell and the second functional layer, both the first functional layer and the second functional layer including perfluorohexanone microcapsules; wherein, the mass percentage of perfluorohexanone microcapsules in the first functional layer is less than the mass percentage of perfluorohexanone microcapsules in the second functional layer.

[0021] In the technical solution of this invention, a functional layer is provided on the inner side of the casing, and the functional layer includes perfluorohexanone microcapsules. When the battery cell inside the power bank experiences thermal runaway due to a short circuit or physical damage, causing the internal temperature of the casing to rise sharply and reach a preset threshold, the functional layer on the inner side of the casing will be rapidly stimulated by heat, causing the microcapsules to rupture and quickly release perfluorohexanone fire extinguishing agent. This fire extinguishing agent can create a localized high-concentration suppression environment in the battery cell and surrounding circuit area. Through physical heat absorption and chemical chain reaction interruption, it can extinguish the fire source in time or effectively suppress heat spread in the nascent stage of a fire. Therefore, the technical solution of this application can improve the safety of power banks under high-temperature conditions.

[0022] Furthermore, because the second functional layer is closer to the heat source of the battery cell and has a higher concentration of extinguishing agent, when the battery cell experiences thermal runaway, the second functional layer can rapidly release a large amount of perfluorohexanone, forming a high-concentration suppression environment in the core area of ​​the ignition point, thus achieving rapid fire extinguishing. Meanwhile, the first functional layer, located on the outside, has a lower concentration. On the one hand, it can act as a supplementary release source when heat is conducted outward, delaying or preventing the flame from breaking through the shell. On the other hand, in the absence of extreme high temperatures or local rupture of microcapsules, it can effectively avoid resource waste or shell bulging caused by excessive release of the outer extinguishing agent, thereby balancing fire extinguishing intensity and structural stability within a limited space.

[0023] In some embodiments, the mass percentage of perfluorohexanone microcapsules in the first functional layer is m1, and the mass percentage of perfluorohexanone microcapsules in the second functional layer is m2, with the difference between m2 and m1 being 5% to 15%. If the difference is too small, the concentrations of the extinguishing agent in the inner and outer layers will be similar, which may result in the extinguishing agent being consumed in large quantities before the heat is conducted to the shell due to the outer layer participating in the reaction too early, and may also easily cause a sudden increase in the internal pressure of the shell due to the simultaneous release of the inner and outer layers. If the difference is too large, the high concentration in the inner layer may cause microcapsule aggregation, affecting the coating adhesion and film uniformity, while the low concentration in the outer layer will make it difficult to form an effective barrier when the flame spreads to the shell. Controlling the difference within the range of 5% to 15% can ensure that the inner heat source triggering zone has sufficient initial extinguishing intensity to achieve rapid fire suppression, while also reserving an appropriate supplementary dose for the outer layer to delay flame penetration.

[0024] In some embodiments, the perfluorohexanone microcapsules in the first functional layer account for 40% to 60% by mass, which can provide sufficient supplementary extinguishing dosage to delay or prevent the breakthrough when the flame spreads to the shell, and avoid premature release or decrease in coating cohesive strength due to excessive concentration at non-extreme temperatures.

[0025] In some embodiments, the perfluorohexanone microcapsules in the second functional layer account for 45% to 75% of the mass, enabling the rapid release of a high concentration of extinguishing agent at the moment of thermal runaway of the battery cell, forming an effective suppression zone at the core of the fire source, and achieving rapid fire suppression.

[0026] In some embodiments, the thickness of the functional layer is 0.1mm to 3mm; this setting allows the functional layer to store a sufficient amount of perfluorohexanone microcapsules to cope with the risk of thermal runaway, while avoiding the functional layer from encroaching on the cell space or affecting the casing assembly due to excessive thickness.

[0027] In some embodiments, the thickness ratio of the first functional layer to the second functional layer is 1:(4~9). This configuration allows the thicker inner second functional layer to carry a higher concentration of extinguishing agent to achieve rapid extinguishing of the fire source core, while the thinner outer first functional layer acts as an auxiliary barrier to delay the flame breakthrough. At the same time, it reduces the risk of uneven coating stress or peeling caused by the large difference in thickness between the inner and outer layers.

[0028] In some embodiments, the thickness of the housing is 0.8mm to 2mm. The design aims to be as lightweight as possible while maintaining basic structural strength, allowing sufficient design margin for the functional layers.

[0029] The aforementioned thickness settings can be selected individually or set simultaneously. When set simultaneously, all three work together to ensure that the power bank casing can achieve a balance between rapid response, multi-layered protection, and structural integrity in the event of extreme thermal runaway, significantly improving the overall safety and reliability of the product.

[0030] In some embodiments, the perfluorohexanone microcapsules have a core-shell structure, wherein the core is perfluorohexanone and the shell is a non-porous polymer. This core-shell structure can achieve good encapsulation of perfluorohexanone and improve the storage stability of the perfluorohexanone microcapsules, so that they maintain structural integrity when the power bank is working normally, and prevent the fire extinguishing agent from being released prematurely before a fire occurs.

[0031] In some embodiments, the shell is formed of at least one resin selected from cross-linked polyvinyl acetate, ethyl vinyl acetate, polyvinyl alcohol, polyurea, polyurethane, polyester resin, epoxy resin, urea-formaldehyde resin, melamine-formaldehyde resin, phenolic resin, and resorcinol-formaldehyde resin.

[0032] In some embodiments, the shell thickness is 200 nm to 5 μm. This configuration allows the shell to rupture and release the extinguishing agent promptly when the cell temperature is within the runaway temperature range, avoiding false triggering at room temperature and enabling a rapid response in the early stages of a fire.

[0033] In some embodiments, the power bank casing further includes a heat insulation layer disposed between the casing and the functional layer. The heat insulation layer comprises at least one of aerogel felt, ceramic fiber, and mica sheet. This heat insulation layer significantly delays the conduction of high temperatures generated by thermal runaway of the battery cell to the outside of the casing. On the one hand, it prevents a rapid increase in the surface temperature of the casing from causing burns to the user or softening and deformation of the casing material. On the other hand, it blocks a large amount of heat inside the functional layer, allowing the ambient temperature of the functional layer to rise rapidly to the rupture threshold of the microcapsules, thus enabling the perfluorohexanone extinguishing agent to be triggered and released in a timely manner. Simultaneously, the presence of the heat insulation layer also prevents excessive heat loss, ensuring that the extinguishing agent maintains an effective concentration and suppression time around the battery cell after release, improving fire extinguishing efficiency. Furthermore, materials such as aerogel felt possess excellent thermal stability and chemical inertness, and will not adversely react with the casing or functional layer during long-term use. Therefore, the heat insulation layer constructs a highly efficient thermal barrier within the power bank casing, achieving synergistic optimization of heat management and fire extinguishing response under thermal runaway conditions.

[0034] In some embodiments, the thickness of the insulation layer is 0.3mm to 1mm; the porosity of the insulation layer is 30% to 50%; while ensuring efficient heat insulation, it provides a smooth diffusion channel for the extinguishing agent released by the rupture of the inner microcapsules, thereby improving the extinguishing efficiency.

[0035] In some embodiments, the functional layer further includes an adhesive, which includes a silane coupling agent modified adhesive, wherein: the silane coupling agent modified adhesive includes at least one of silane coupling agent modified epoxy resin and silane coupling agent modified polyurethane; the silane coupling agent modified adhesive, with its unique "molecular bridge" structure, forms a chemical bond with the inorganic shell or insulation layer at one end and generates a strong interaction with the surface of the organic microcapsule at the other end, thereby greatly enhancing the adhesion between the functional layer and the substrate and preventing delamination or peeling under long-term use or thermal shock; at the same time, the modified epoxy resin or polyurethane has good film-forming properties and flexibility, and can form a continuous and dense protective matrix around the microcapsule, which not only provides stable mechanical support for the microcapsule, but also ensures that it can smoothly rupture and release the extinguishing agent at the thermal runaway temperature.

[0036] In some embodiments, the adhesive in the functional layer accounts for 25% to 60% of the total mass, which enables the functional layer to have sufficient bonding strength and cohesion, while avoiding dilution of the effective content of the microcapsules or hindering the diffusion and release of the extinguishing agent due to excessive adhesive.

[0037] The above-mentioned adhesives can be selected individually or used simultaneously. Using them simultaneously can better achieve uniform dispersion and firm adhesion of microcapsules, while significantly improving the interfacial bonding force and structural stability of the functional layer.

[0038] In some embodiments, the functional layer further includes at least one of a dispersant, an antioxidant, and an ultraviolet absorber.

[0039] In some embodiments, the mass percentage of the dispersant in the functional layer is 0.1% to 1.5%. This setting can improve the uniformity of the dispersion of perfluorohexanone microcapsules in the functional layer, avoid excessively high or low local extinguishing agent concentrations due to agglomeration, and thus ensure that the functional layer can achieve a consistent and predictable triggering response in the event of thermal runaway.

[0040] In some embodiments, the antioxidant content in the functional layer is 0.3% to 1% by mass, which can effectively inhibit the thermo-oxidative aging of the adhesive (especially epoxy resin or polyurethane) under long-term use or temperature rise environment, delay material embrittlement or degradation, and maintain the mechanical integrity and adhesion of the functional layer.

[0041] In some embodiments, the mass percentage of the ultraviolet absorber in the functional layer is 0.2% to 0.8%, which can reduce ultraviolet radiation in sunlight or long-term storage environments, prevent the adhesive and microcapsule wall material from deteriorating or becoming brittle due to photoaging, and avoid accidental release of the fire extinguishing agent under unexpected conditions.

[0042] The three additives mentioned above work synergistically within their respective preferred dosage ranges, which can significantly improve the long-term reliability and environmental adaptability of the charging shell while maintaining fire extinguishing effectiveness.

[0043] In some embodiments, the shell material includes at least one of polymeric materials, metallic materials, composite materials, and natural materials. The polymeric material may optionally include at least one of ABS, PC, ABS / PC alloy, PP, silicone, TPU, and bio-based PLA. The metallic material may optionally include at least one of aluminum alloy, stainless steel, magnesium alloy, and titanium alloy. The composite material may optionally include at least one of carbon fiber reinforced polymer (CFRP) and glass fiber reinforced plastic (FRP). The natural material may optionally include at least one of wood and bamboo.

[0044] The technical solution of the present invention will be further described in detail below with reference to specific embodiments. It should be understood that the following embodiments are only used to explain the present invention and are not intended to limit the present invention.

[0045] Example 1 Example 1 provides a power bank casing, which includes, from the outside to the inside, a shell, a heat insulation layer, and a functional layer.

[0046] The shell is made of ABS+PC alloy particles (mass ratio 1:1), with a melt flow index of 15g / 10min (220℃, 5kg) and a shell thickness of 1.5mm. The insulation layer uses aerogel felt (thermal conductivity 0.018 W / (m)). K), porosity 40%), and the thickness of the insulation layer is 0.5mm; The functional layer includes perfluorohexanone microcapsules (purchased from Jiaxing Jifuai Fire Protection Technology Co., Ltd., specification: gfi microcapsules), binder (a mixture of E-44 epoxy resin and 1% silane coupling agent), dispersant (polyurethane), antioxidant (hindered phenolic antioxidant 1010) and ultraviolet absorber (UV-531), and the thickness of the functional layer is 2mm. The functional layers consist of a first functional layer and a second functional layer. The first functional layer comprises 40% perfluorohexanone microcapsules, 58% binder, 1% dispersant, 0.5% antioxidant, and 0.5% UV absorber. The second functional layer comprises 45% perfluorohexanone microcapsules, 53% binder, 1% dispersant, 0.5% antioxidant, and 0.5% UV absorber. The thickness ratio of the first functional layer to the second functional layer is 1:4.

[0047] The differences between Examples 2 to 9 and Comparative Examples 1 to 2 and Example 1 are shown in Table 1.

[0048] The difference between Examples 2 to 4 and Example 1 is that the mass percentage of perfluorohexanone microcapsules in the first functional layer is different, and the mass percentage of perfluorohexanone microcapsules in the second functional layer is different. For specific parameters, please refer to Table 1.

[0049] The difference between Examples 5 to 8 and Example 3 is that the porosity of the insulation layer is different. For specific parameters, please refer to Table 1.

[0050] The difference between Example 9 and Example 3 is that no heat insulation layer is provided. For specific parameters, please refer to Table 1.

[0051] The difference between Comparative Example 1 and Example 1 is that no heat insulation layer and functional layer are provided. For specific parameters, please refer to Table 1.

[0052] The difference between Comparative Example 2 and Example 1 is that the mass percentage of perfluorohexanone microcapsules in the first functional layer is different, the mass percentage of perfluorohexanone microcapsules in the second functional layer is different, and no heat insulation layer is provided. For specific parameters, please refer to Table 1.

[0053] Performance testing (1) Simulated battery thermal runaway test: The power bank shell sample to be tested is fixed on the test platform. Thermocouples are attached to the surface of the functional layer inside the shell to monitor temperature changes in real time. Then the shell sample is placed above the heating device with the functional layer facing the heat source. The shell is heated by the heating device at a constant heating rate to simulate the thermal runaway condition of the battery cell. At the same time, the temperature data monitored by the thermocouple and whether flames or smoke appear inside the shell are recorded. When the temperature shown by the thermocouple reaches 150°C, the time is recorded until the temperature drops below the safety line (50°C) and the time is recorded again. The difference between the two times is recorded in Table 1.

[0054] Table 1. Parameters and performance parameters of the power bank casings of Examples 1 to 9 and Comparative Examples 1 to 2.

[0055] As shown in Table 1, compared with the shell of Comparative Example 1 which does not use a functional layer and a heat insulation layer, the shells obtained by using a functional layer in Examples 1 to 9 of this application have a cooling time difference of less than 75 minutes after being heated. This indicates that the technical solution of this application using the functional layer can improve the safety of the power bank shell under high temperature conditions. In Comparative Example 2, the mass ratio of perfluorohexanone microcapsules in the first functional layer is greater than the mass ratio of perfluorohexanone microcapsules in the second functional layer. Compared with Comparative Example 2, the shells obtained by having m1 less than m2 in Examples 1 to 9 have a cooling time difference of less than 75 minutes after being heated. This indicates that the technical solution of this application, which uses a mass ratio of perfluorohexanone microcapsules in the first functional layer less than the mass ratio of perfluorohexanone microcapsules in the second functional layer, can improve the safety of the power bank shell under high temperature conditions.

[0056] In Examples 1 to 9, compared to Example 9 which does not have a heat insulation layer, Examples 1 to 8 add a heat insulation layer on top of the functional layer, which further improves the safety of the power bank casing under high temperature conditions.

[0057] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A power bank casing, characterized in that, include: case; as well as, A functional layer is disposed inside the housing. The functional layer includes a first functional layer and a second functional layer. The first functional layer is disposed between the housing and the second functional layer. Both the first functional layer and the second functional layer include perfluorohexanone microcapsules. Wherein, the mass percentage of perfluorohexanone microcapsules in the first functional layer is less than the mass percentage of perfluorohexanone microcapsules in the second functional layer; The power bank casing also includes a heat insulation layer, which is disposed between the casing and the functional layer. The heat insulation layer includes at least one of aerogel felt, ceramic fiber, and mica sheet. The porosity of the insulation layer is 30%~50%; The mass percentage of perfluorohexanone microcapsules in the first functional layer is m1, and the mass percentage of perfluorohexanone microcapsules in the second functional layer is m2, with the difference between m2 and m1 being 5% to 15%.

2. The power bank casing as described in claim 1, characterized in that, The perfluorohexanone microcapsules in the first functional layer comprise 40% to 60% by mass; and / or, The perfluorohexanone microcapsules in the second functional layer account for 45% to 75% of the total mass.

3. The power bank casing as described in claim 1, characterized in that, The thickness of the functional layer is 0.1mm to 3mm; and / or, The thickness ratio of the first functional layer to the second functional layer is 1:(4~9); and / or, The thickness of the shell is 0.8mm to 2mm.

4. The power bank casing as described in claim 1, characterized in that, The perfluorohexanone microcapsules have a core-shell structure, wherein the core of the core-shell structure is perfluorohexanone, and the shell of the core-shell structure is a non-porous polymer, wherein: The shell is formed of at least one resin selected from cross-linked polyvinyl acetate, ethyl vinyl acetate, polyvinyl alcohol, polyurea, polyurethane, polyester resin, epoxy resin, urea-formaldehyde resin, melamine-formaldehyde resin, phenolic resin, and resorcinol-formaldehyde resin; and / or, The thickness of the shell is 200 nm to 5 μm.

5. The power bank casing as described in claim 1, characterized in that, The thickness of the insulation layer is 0.3mm to 1mm.

6. The power bank casing as described in claim 1, characterized in that, Both the first functional layer and the second functional layer include an adhesive, wherein the adhesive includes a silane coupling agent modified adhesive, wherein: The silane coupling agent modified adhesive includes at least one of silane coupling agent modified epoxy resin and silane coupling agent modified polyurethane; and / or, The adhesive in the functional layer accounts for 25% to 60% of the total mass.

7. The power bank casing as described in claim 6, characterized in that, The functional layer also includes at least one of a dispersant, an antioxidant, and an ultraviolet absorber.

8. The power bank casing as described in claim 1, characterized in that, The shell is made of at least one of the following materials: polymer, metal, composite material, and natural material.

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