Composite film, battery, battery temperature control system

Abstract

The application belongs to the technical field of temperature control, and discloses a composite film, which comprises a multilayer structure, including a substrate, a heating layer containing a metal oxide semiconductor material, a conductive electrode and an insulating layer. The composite film utilizes the excellent electro-thermal conversion performance and heat conduction characteristics of the MOSH semiconductor material to quickly heat the battery in a heat conduction mode. The insulating layer arranged on the outermost layer of the composite film can not only protect the internal heating layer from being abraded, but also can play the roles of insulation voltage resistance and internal structure protection. Therefore, the composite film provided by the application can provide an efficient, energy-saving and reliable low-temperature heating solution, and can be applied to new energy vehicles to improve the performance and user experience of the new energy vehicles in a low-temperature environment.

Description

Technical Field

[0001] This application relates to the field of temperature control technology, specifically to composite films, batteries, and battery temperature control systems. Background Technology

[0002] As the power source of new energy vehicles, the performance of the power battery system directly affects the overall vehicle power performance. With the widespread application of new energy vehicles, the problem of battery performance degradation in high and low temperature environments is becoming increasingly prominent. Under low temperature conditions, the internal resistance of the battery increases, leading to limited power and energy output, which in turn affects the starting, acceleration, and driving range of the vehicle it powers, among other aspects.

[0003] It should be noted that the above statements are only used to provide background information related to this application and do not necessarily constitute prior art. Utility Model Content

[0004] In a first aspect of this application, a composite film is proposed, comprising: a substrate; a heating layer located on one side of the substrate, the heating layer having a thickness of 10 μm-100 μm; a conductive electrode disposed on the side of the heating layer away from the substrate and electrically connected to the heating layer; and an insulating layer disposed on the side of the conductive electrode and the heating layer away from the substrate.

[0005] The composite membrane proposed in this application can generate an electric field when energized, releasing far-infrared spectral rays of a specific wavelength with superior thermal effects to achieve omnidirectional heating of the composite membrane, uniform temperature rise over a large area, and a heating rate of 1.5℃ / min-2.5℃ / min, while maintaining an energy conversion efficiency of over 99.6%. This allows for the rapid generation of a large amount of heat, enabling the temperature of the object to be heated to reach the desired suitable temperature range in a short time.

[0006] In some embodiments, the heating layer is made of a metal oxide semiconductor material. The metal oxide semiconductor material of the heating layer can be deposited on a substrate by magnetron sputtering and oxidized in an oxygen-rich environment or atmosphere to form a layered structure. Thus, the heating layer has a uniform distribution of metal oxide semiconductor material, and the composite film can achieve a uniform heating effect.

[0007] In some embodiments, the metal oxide semiconductor material is a metal oxide corresponding to the elements Ni, Cr, Fe, Al, or Si. Therefore, the aforementioned metal oxide is a semiconductor material with high electrothermal conversion efficiency, resulting in a composite film with high heating efficiency.

[0008] In some embodiments, the insulating layer is made of epoxy resin-modified polyethylene terephthalate. The aforementioned insulating layer material has good insulation properties, can be prepared by spraying, and has good wear resistance, thereby fully covering and protecting the conductive electrodes and heating layer in the composite film.

[0009] In some embodiments, the thickness of the insulating layer is 20 μm-40 μm. When the thickness of the insulating layer is within the aforementioned range, its insulating properties protect the conductive components in the composite film, thereby reducing the risk of short circuits caused by conductive connections between the conductive electrodes, the heating layer, and other conductive materials outside the composite film.

[0010] In some embodiments, the substrate material is polyethylene terephthalate. The aforementioned substrate material has good insulation and flexibility, and is lightweight; therefore, the composite film can encapsulate the object to be heated under certain deformation to achieve a better heating effect.

[0011] In some embodiments, the thickness of the composite film is 40 μm-80 μm. The thickness of the composite film is affected by the thickness of the substrate and the thickness of the heating film in the composite film. Therefore, when the thickness of the composite film is within the aforementioned range, it is advantageous to place the composite film on the outside of the object being heated, resulting in better heating and processing performance.

[0012] In some embodiments, the thickness of the substrate is 10 μm-30 μm. When the substrate thickness is within the aforementioned range, the heat generated by the heating layer in the composite film can be transferred to the object being heated by the composite film through the substrate, thereby enabling the composite film to achieve high heating efficiency.

[0013] In a second aspect, this application proposes a battery comprising the composite film proposed in this application. Therefore, the composite film allows the battery to be rapidly heated to a suitable operating temperature when operating in low-temperature environments, significantly reducing the preheating time under low-temperature conditions, improving battery performance, and extending battery life. The composite heating film covering the outer surface of the battery provides uniform heating of individual cells from all directions, helping to reduce damage to the battery structure caused by localized overheating.

[0014] In a third aspect, this application proposes a battery temperature control system, including the composite film or the battery proposed in this application. Therefore, the battery temperature control system can rapidly heat up or stop heating the battery managed in the system, facilitating rapid and agile temperature control. Attached Figure Description

[0015] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0016] Figure 1 This is a schematic diagram of the structure of a composite membrane according to an embodiment of this application.

[0017] Figure 2 This is a circuit diagram of the external power supply for the battery in one embodiment of this application.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1. Substrate; 2. Heating layer; 3. Conductive electrode; 3-1. Conductive positive electrode; 3-2. Conductive negative electrode; 4. Insulating layer; 5. Power lead. Detailed Implementation

[0020] The embodiments of this application are described in detail below, with examples of these embodiments shown in the accompanying drawings. However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters and repetitive descriptions of practically identical structures may be omitted. This is to avoid unnecessarily lengthy descriptions and to facilitate understanding by those skilled in the art. Furthermore, the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand this application and are not intended to limit the subject matter of the claims.

[0021] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit this application; unless otherwise stated, the values ​​of the parameters mentioned in this application can be measured using various measurement methods commonly used in the art (e.g., they can be tested according to the methods given in the embodiments of this application).

[0022] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are open-ended expressions, meaning they include what is specified in this application but do not exclude other aspects.

[0023] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0024] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0025] Batteries operating in extremely cold environments for extended periods will experience performance degradation, affecting their instantaneous charge and discharge power and the amount of charge and discharge, thus impacting the vehicle's instantaneous power and driving range. To address this issue, common battery heating technologies include PTC heating, liquid circulation heating, and heating plate heating; however, these methods suffer from low heating efficiency, poor temperature uniformity, or system complexity. In recent years, temperature-controlled heating film technology utilizing membrane materials has attracted attention due to its high efficiency, rapid heating, and uniform heating characteristics.

[0026] This invention proposes a composite film with a multi-layer structure, including a substrate, a heating layer containing a metal oxide semiconductor material, conductive electrodes, and an insulating layer. The composite film utilizes the excellent electrothermal conversion performance and thermal conductivity of the metal oxide semiconductor material to rapidly heat the battery through heat conduction. The outermost insulating layer of the composite film protects the internal heating layer from wear and also provides insulation, voltage resistance, and protection for the internal structure. Therefore, the composite film proposed in this application provides a highly efficient, energy-saving, and reliable low-temperature heating solution that can be applied to new energy vehicles, improving their performance and user experience in low-temperature environments.

[0027] In a first aspect of this application, a composite membrane is proposed, with reference to Figure 1 The device includes: a substrate 1; a heating layer 2 located on one side of the substrate 1, the heating layer 2 having a thickness of 10μm-100μm; a conductive electrode 3, which may include a conductive positive electrode 3-1 and a conductive negative electrode 3-2, the conductive electrode 3 being disposed on the side of the heating layer 2 away from the substrate 1 and conductively connected to the heating layer 2; and an insulating layer 4 disposed on the side of the conductive electrode 3 and the heating layer 2 away from the substrate 1.

[0028] The composite membrane proposed in this application can generate an electric field when energized, releasing far-infrared spectral rays of a specific wavelength with superior thermal effects to achieve omnidirectional heating of the composite membrane, uniform temperature rise over a large area, and a heating rate of 1.5℃ / min-2.5℃ / min, while maintaining an energy conversion efficiency of over 99.6%. This allows for the rapid generation of a large amount of heat, enabling the temperature of the object to be heated to reach the desired suitable temperature range in a short time.

[0029] In some embodiments, reference Figure 1 It further includes: a conductive lead 5, which is electrically connected to the conductive electrode 3. Thus, the conductive electrode on the composite film can be connected to the positive and negative terminals of a power supply via the conductive lead. (Refer to...) Figure 2 This forms a complete power supply path, which can supply power to the composite membrane through a power supply, converting electrical energy into heat energy.

[0030] In some embodiments, the heating layer is made of a metal oxide semiconductor material (MOSH semiconductor material). The metal oxide semiconductor material of the heating layer can be deposited on the substrate by magnetron sputtering and oxidized in an oxygen-rich environment or atmosphere to form a layered structure. Thus, the heating layer has a uniform distribution of metal oxide semiconductor material, and the composite film can achieve a uniform heating effect.

[0031] In some embodiments, the metal oxide semiconductor material is a metal oxide corresponding to the elements Ni, Cr, Sn, Fe, In, or Si. Therefore, the aforementioned metal oxide is a semiconductor material with high electrothermal conversion efficiency, resulting in a composite film with high heating efficiency.

[0032] In some embodiments, the insulating layer is made of epoxy resin-modified polyethylene terephthalate. The aforementioned insulating layer material has good insulation properties, can be prepared by spraying, and has good wear resistance, thereby fully covering and protecting the conductive electrodes and heating layer in the composite film.

[0033] In some embodiments, the thickness of the insulating layer is 20 μm-40 μm. When the thickness of the insulating layer is within the aforementioned range, its insulating properties protect the conductive components in the composite film, thereby reducing the risk of short circuits caused by conductive connections between the conductive electrodes, the heating layer, and other conductive materials outside the composite film.

[0034] As an example, the thickness of the insulating layer is 20μm, 25μm, 30μm, 35μm, or 40μm.

[0035] In some embodiments, the substrate material is polyethylene terephthalate. The aforementioned substrate material has good insulation and flexibility, and is lightweight; therefore, the composite film can encapsulate the object to be heated under certain deformation to achieve a better heating effect.

[0036] In some embodiments, the thickness of the composite film is 40 μm-80 μm. The thickness of the composite film is affected by the thickness of the substrate and the thickness of the heating film in the composite film. Therefore, when the thickness of the composite film is within the aforementioned range, it is advantageous to place the composite film on the outside of the object being heated, resulting in better heating and processing performance.

[0037] As an example, the thickness of the composite film is 40μm, 45μm, 50μm, 55μm, 60μm, 65μm, 70μm, 75μm, or 80μm.

[0038] In some embodiments, the thickness of the substrate is 10 μm-30 μm. When the substrate thickness is within the aforementioned range, the heat generated by the heating layer in the composite film can be transferred to the object being heated by the composite film through the substrate, thereby enabling the composite film to achieve high heating efficiency.

[0039] As an example, the thickness of the substrate is 10μm, 15μm, 20μm, 25μm, or 30μm.

[0040] In a second aspect, this application proposes a battery comprising the composite film proposed in this application. Therefore, the composite film allows the battery to be rapidly heated to a suitable operating temperature when operating in low-temperature environments, significantly reducing the preheating time under low-temperature conditions, improving battery performance, and extending battery life. The composite heating film covering the outer surface of the battery provides uniform heating of individual cells from all directions, helping to reduce damage to the battery structure caused by localized overheating.

[0041] In a third aspect, this application proposes a battery temperature control system, including the composite film or the battery proposed in this application. Therefore, the battery temperature control system can rapidly heat up or stop heating the battery managed in the system, facilitating rapid and agile temperature control.

[0042] The following specific embodiments illustrate the solution of this application. It should be noted that these embodiments are for illustrative purposes only and should not be considered as limiting the scope of this application. Where specific techniques or conditions are not specified in the embodiments, they are performed according to the techniques or conditions described in the literature in this field or according to the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be obtained commercially.

[0043] Example 1

[0044] The substrate is PET with a thickness of 20μm; the heating layer has a thickness of 10μm and the heating layer material is In2O3 / SnO2; the insulating layer has a thickness of 10μm.

[0045] Example 2

[0046] Example 2 is the same as Example 1, except that the thickness of the insulating layer is 20 μm.

[0047] Example 3

[0048] Example 3 is the same as Example 1, except that the thickness of the insulating layer is 30 μm.

[0049] Example 4

[0050] Example 4 is the same as Example 3, except that the substrate thickness is 40 μm.

[0051] Example 5

[0052] Example 5 is the same as Example 1, except that the thickness of the heating layer is 20 μm.

[0053] Example 6

[0054] Example 6 is the same as Example 3, except that the heating layer material is In2O3 / SnO2 / Al3O2.

[0055] Test method:

[0056] (1) Heating rate

[0057] High-precision temperature sensors (such as thermocouples) are used to record the temperature changes on the surface of the thermally conductive film in real time.

[0058] The heating rate is obtained by calculating the ratio of the temperature difference to the duration within a specific time period. The formula is: Heating rate = (Termination temperature - Starting temperature) / Heating time, where the units of termination temperature and starting temperature are °C, and the unit of heating time is min.

[0059] (2) Electrothermal conversion efficiency

[0060] Input power measurement: Use tools such as power meters and multimeters to measure the voltage, current and power factor of the equipment, and calculate the input electrical energy (unit: watts / W). Output heat measurement: Measure the heat energy generated by the heating equipment through heat flow sensors or calorimeters, usually in joules (J).

[0061] Efficiency calculation: According to the formula, electrothermal conversion efficiency = (output useful heat / input total electrical energy) x 100%. The calculation results need to exclude the influence of environmental heat loss (such as thermal radiation and convection).

[0062] Test results: See Table 1.

[0063] Table 1

[0064]

[0065]

[0066] As can be seen from Table 1, the composite membrane proposed in this application has an electrothermal conversion efficiency of ≥99%, which can achieve efficient and uniform heating of the battery, battery pack and the whole vehicle.

[0067] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them.

[0068] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0069] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A composite membrane, characterized in that, include: Base; A heating layer is located on one side of the substrate, and the thickness of the heating layer is 10μm-100μm; A conductive electrode is disposed on the side of the heating layer away from the substrate and is electrically connected to the heating layer. An insulating layer is disposed on the side of the conductive electrode and the heating layer away from the substrate.

2. The composite membrane according to claim 1, characterized in that, The material of the heating layer is a metal oxide semiconductor material.

3. The composite membrane according to claim 2, characterized in that, The metal oxide semiconductor material is a metal oxide corresponding to the elements Ni, Cr, Sn, Fe, In, or Si.

4. The composite membrane according to claim 1, characterized in that, The insulating layer is made of epoxy resin-modified polyethylene terephthalate.

5. The composite membrane according to claim 4, characterized in that, The thickness of the insulating layer is 20μm-40μm.

6. The composite membrane according to claim 1, characterized in that, The substrate is made of polyethylene terephthalate.

7. The composite membrane according to any one of claims 1-6, characterized in that, The thickness of the composite membrane is 40μm-80μm.

8. The composite membrane according to any one of claims 1-6, characterized in that, The thickness of the substrate is 10μm-30μm.

9. A battery, characterized in that, The battery comprises the composite membrane according to any one of claims 1-8.

10. A battery temperature control system, characterized in that, Includes the composite membrane according to any one of claims 1-8 or the battery according to claim 9.

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