High-flexibility heating film for energy storage module

Abstract

The invention discloses a high-flexibility heating film for an energy storage module, the heating film is of a five-layer composite structure and sequentially comprises an insulating layer, a heat conduction layer, a heating layer, an insulating layer and an adhesion layer, and a micro-nano thermal interface material is added between the heating layer and the heat conduction layer to improve the heat conduction efficiency. The heating layer is designed to be of a honeycomb-shaped circuit structure. The temperature control module, the power adjusting module, the safety protection module and the intelligent control module are matched, and the functions of high-precision temperature control, over-temperature protection, short-circuit protection and remote monitoring are achieved. The preparation method comprises the steps of material coating and curing of the heat conduction layer and the heating layer, addition of a micro-nano thermal interface material, superposition of the insulation layer and the adhesion layer, vacuum hot pressing and surface treatment. The high-flexibility heating film has the advantages of efficient heat conduction, excellent flexibility, waterproofness, safety and the like, can be widely applied to low-temperature environment heat management of equipment such as an energy storage module and the like, and has remarkable practical value and market prospect.

Description

Technical Field

[0001] The present invention relates to the field of preparation of heating films, and more specifically to a high-flexibility heating film for an energy storage module. Background Art

[0002] With the rapid development of the new energy industry, energy storage technology plays an increasingly important role in improving energy efficiency and access to renewable energy. As the core component of the energy storage system, the performance of the energy storage module directly affects the reliability and stability of the energy storage equipment. However, in low temperature environments, the energy output capacity and charging and discharging efficiency of the energy storage module will drop significantly, which poses a severe challenge to its application in cold regions.

[0003] In order to ensure that the energy storage module can work normally in a low temperature environment, it is usually necessary to design a special heating device for the module. Although traditional heating devices such as electric heating wires and thick film heaters have certain heating effects, they generally have the following shortcomings:

[0004] (1) Traditional heating devices usually have strong structural rigidity and are difficult to adapt to the complex appearance design and installation requirements of energy storage modules. Especially when the internal structure of the module is compact, its layout will be greatly restricted.

[0005] (2) Traditional heating technology has a long heat conduction path and large heat loss, making it difficult to heat the module quickly and evenly, especially in low-power demand scenarios, where the energy efficiency performance is particularly insufficient.

[0006] (3) Traditional heating devices are prone to problems such as local overheating or short circuits during use, which may lead to performance degradation of the energy storage module or even safety hazards. Summary of the invention

[0007] In order to solve the above problems, a highly flexible heating film technology has gradually emerged in the market. Based on the good plasticity and thermal conductivity of flexible materials, this technology can better fit the shape of the energy storage module and provide uniform and efficient heating effects. The specific solution is as follows:

[0008] A highly flexible heating film for an energy storage module, the highly flexible heating film having five layers including an insulating layer, a thermal conductive layer, a heating layer, an insulating layer and an adhesive layer; a micro-nano thermal interface material is added between the heating layer and the thermal conductive layer; the thermal conductive layer is made of one or more of graphene, carbon nanotubes or silver nanowires; the heating layer is made of a carbon-based heating material; the insulating material is a combination of one or two of polyimide or polyethylene terephthalate materials; and the adhesive layer is silica gel.

[0009] Furthermore, the thickness of the highly flexible heating film is 50 to 200 μm.

[0010] Furthermore, the structure of the heating layer is a honeycomb circuit.

[0011] Furthermore, the highly flexible heating film is equipped with a temperature control module, a power regulation module, a safety protection module and an intelligent control module; a high-precision thermistor or thermocouple is used as a temperature sensor in the temperature control module; PWM technology is used in the power regulation module to adjust the heating power; an over-temperature protection circuit is added to the safety protection module and a short-circuit protection device is provided; and remote monitoring and adjustment are achieved by integrating a wireless communication module in the intelligent control module.

[0012] Furthermore, the method for preparing the highly flexible heating film comprises the following steps:

[0013] S1. Coating the thermal conductive layer material: uniformly coating the thermal conductive layer material on the surface of the insulating layer by spin coating or scraping coating;

[0014] S2. Coating the heating layer material: Select carbon-based heating material as the heating layer material, and evenly coat the material on the surface of the thermal conductive layer through a scraping process.

[0015] S3, adding micro-nano thermal interface material: coating thickness is 1 to 5 μm;

[0016] S4, superimposed insulating layer: select polyimide or polyethylene terephthalate material, cut it to the same size as the heating film, and superimpose it on the heating layer to form a second insulating layer;

[0017] S5, adding an adhesive layer: coating a silicone adhesive material on the outside of the second insulating layer;

[0018] S6, lamination and hot pressing treatment: pressing the above layers into a whole through vacuum hot pressing process;

[0019] S7. Surface treatment: A hydrophobic coating is applied to the surface of the highly flexible heating film to improve the waterproof performance.

[0020] Furthermore, in S1, the coating thickness of the thermal conductive layer is 10 to 30 μm, the curing temperature is 120 to 150° C., and the curing time is 30 to 60 min.

[0021] Furthermore, the coating thickness of the heating layer material in S2 is 10 to 20 μm; and the honeycomb heating circuit is engraved using laser etching technology.

[0022] Furthermore, the coating thickness of the micro-nano thermal interface material is 1 to 5 μm.

[0023] Furthermore, the thickness of the insulating layer in S4 is 5 to 50 μm; the pressing temperature is 100 to 130° C., and the pressing pressure is 5 to 10 MPa.

[0024] Furthermore, in S6, the lamination temperature is 120-150° C., the lamination pressure is 5-10 MPa, and the lamination time is 10-20 min.

[0025] Beneficial effects:

[0026] This patent proposes a highly flexible heating film for energy storage modules, which has the following advantages:

[0027] (1) By using high thermal conductivity materials such as graphene, carbon nanotubes or silver nanowires in the thermal conductive layer and adding micro-nano thermal interface materials between the heating layer and the thermal conductive layer, the thermal resistance is significantly reduced, the heat conduction efficiency is improved, and the heating uniformity and response speed are greatly improved, meeting the needs of rapid heating of the energy storage module in a low temperature environment.

[0028] (2) The insulating layer is combined with the silicone adhesive layer to make the heating film have good flexibility and bendability, which can adapt to the energy storage module with complex curves and improve the fit and thermal efficiency.

[0029] (3) The heating layer is designed as a honeycomb circuit structure, which not only optimizes the heat distribution, but also improves the mechanical strength and durability of the membrane material, while reducing the risk of local overheating and improving the overall service life.

[0030] (4) Through the matching temperature control module, power regulation module and safety protection module, precise temperature control is ensured during the working process, and over-temperature protection and short-circuit protection are realized, which significantly improves the safety of the system. DETAILED DESCRIPTION

[0031] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with examples. The examples are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0032] Example:

[0033] The preparation steps of a highly flexible heating film for an energy storage module are as follows:

[0034] S1. Coating thermal conductive layer material

[0035] Material selection: A hybrid material of graphene and silver nanowires with a thermal conductivity of 250W / m·K.

[0036] Coating process: Use scraping technology to evenly coat the thermal conductive layer material on the surface of the insulation layer.

[0037] Coating thickness: 20μm.

[0038] Curing conditions: Curing temperature: 135°C; Curing time: 45 minutes.

[0039] S2. Coating heating layer material

[0040] Material selection: carbon-based heating material, resistivity is 0.3Ω·cm.

[0041] Coating process: The heating layer material is evenly coated on the surface of the thermal conductive layer through a scraping process.

[0042] Coating thickness: 15μm.

[0043] Etched circuit: Laser etching technology is used to depict honeycomb circuit patterns, with a circuit spacing of 0.5mm and an etching accuracy of ≤0.01mm.

[0044] Circuit power density: 1.0W / cm 2 .

[0045] S3. Coating of micro-nano thermal interface materials

[0046] Material selection: High thermal conductivity micro-nano composite material, thermal conductivity 5W / m·K.

[0047] Coating thickness: 3μm.

[0048] Process: Spin coating technology is used to evenly cover the heating layer and the thermal conductive layer.

[0049] S4. Superimposed insulation layer

[0050] Material selection: Polyimide film, thickness 25μm.

[0051] Cutting size: Same as substrate size (200mm×300mm).

[0052] Pressing conditions: pressing temperature: 120°C; pressing pressure: 7MPa; pressing time: 15 minutes.

[0053] S5. Applying Adhesion Layer

[0054] Material selection: Silicone adhesive material.

[0055] Coating thickness: 15μm.

[0056] Process: Evenly coat the surface of the second insulating layer through the scraping process.

[0057] S6. Lamination and heat pressing

[0058] Process conditions: lamination temperature: 135°C; lamination pressure: 8 MPa; lamination time: 18 minutes.

[0059] Vacuum environment: ensure that the air content is ≤0.1%.

[0060] S7. Surface treatment

[0061] Hydrophobic coating: A layer of hydrophobic material with a thickness of 2 μm is coated on the surface.

[0062] Coating method: spin coating process.

[0063] Curing conditions: Curing temperature: 90°C; Curing time: 15 minutes.

[0064] The heating film obtained in the embodiment was tested, and the test items and results are as follows:

[0065]

[0066] In summary, the combination of the thermal conductive layer and the micro-nano thermal interface material significantly improves the thermal conduction efficiency; the performance remains stable after multiple bending and heating cycle tests; and the integrated module ensures precise temperature control and safety protection.

[0067] As a further improvement, the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A highly flexible heating film for an energy storage module, characterized in that: The highly flexible heating film has five layers including an insulating layer, a thermal conductive layer, a heating layer, an insulating layer and an adhesive layer; a micro-nano thermal interface material is added between the heating layer and the thermal conductive layer; the thermal conductive layer is made of one or more of graphene, carbon nanotubes or silver nanowires; the heating layer is made of a carbon-based heating material; the insulating material is a combination of one or two of polyimide or polyethylene terephthalate materials; and the adhesive layer is silicone.

2. A highly flexible heating film for an energy storage module according to claim 1, characterized in that: The thickness of the highly flexible heating film is 50-200 μm.

3. The highly flexible heating film for an energy storage module according to claim 1, characterized in that: The structure of the heating layer is a honeycomb circuit.

4. The highly flexible heating film for an energy storage module according to claim 1, characterized in that: The highly flexible heating film is equipped with a temperature control module, a power regulation module, a safety protection module and an intelligent control module; a high-precision thermistor or a thermocouple is used as a temperature sensor in the temperature control module; PWM technology is used in the power regulation module to adjust the heating power; an over-temperature protection circuit is added to the safety protection module and a short-circuit protection device is provided; remote monitoring and adjustment are achieved by integrating a wireless communication module in the intelligent control module.

5. The highly flexible heating film for an energy storage module according to claim 1, characterized in that: The method for preparing the highly flexible heating film comprises the following steps: S1. Coating the thermal conductive layer material: uniformly coating the thermal conductive layer material on the surface of the insulating layer by spin coating or scraping coating; S2. Coating the heating layer material: Select carbon-based heating material as the heating layer material, and evenly coat the material on the surface of the thermal conductive layer through a scraping process. S3, adding micro-nano thermal interface material: coating thickness is 1 to 5 μm; S4, superimposed insulating layer: select polyimide or polyethylene terephthalate material, cut it to the same size as the heating film, and superimpose it on the heating layer to form a second insulating layer; S5, adding an adhesive layer: coating a silicone adhesive material on the outside of the second insulating layer; S6, lamination and hot pressing treatment: pressing the above layers into a whole through vacuum hot pressing process; S7. Surface treatment: A hydrophobic coating is applied to the surface of the highly flexible heating film to improve the waterproof performance.

6. A highly flexible heating film for an energy storage module according to claim 5, characterized in that: The coating thickness of the thermal conductive layer in S1 is 10 to 30 μm, the curing temperature is 120 to 150° C., and the curing time is 30 to 60 min.

7. The highly flexible heating film for energy storage module according to claim 5, characterized in that: The coating thickness of the heating layer material in S2 is 10 to 20 μm; laser etching technology is used to engrave the honeycomb heating circuit.

8. The highly flexible heating film for an energy storage module according to claim 5, characterized in that: The coating thickness of the micro-nano thermal interface material is 1 to 5 μm.

9. The highly flexible heating film for energy storage module according to claim 5, characterized in that: The thickness of the insulating layer in S4 is 5 to 50 μm; the pressing temperature is 100 to 130°C, and the pressing pressure is 5 to 10 MPa.

10. The highly flexible heating film for an energy storage module according to claim 5, characterized in that: In S6, the lamination temperature is 120-150°C, the lamination pressure is 5-10 MPa, and the lamination time is 10-20 min.

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