Flame-retardant isolation film for battery cell

Abstract

The utility model relates to the technical field of isolating membranes, in particular to a flame-retardant isolating membrane for a battery cell. In order to solve the problems that an existing thin film is generally thin on the whole, the insulating property and the protective property of the thin film are low, and potential safety hazards exist in a battery cell, the following technical scheme is provided: the insulating film comprises an insulating film main body, and the insulating film main body comprises a base material layer; the buffer layers are arranged on the two sides of the base material layer and used for buffering external impact force; the two sets of reinforcing layers are arranged on the sides, away from the base material layer, of the two sets of buffer layers correspondingly, and the reinforcing layers are used for improving the mechanical strength of the isolation film body; the two groups of insulating layers are respectively arranged on the sides, far away from the buffer layer, of the two groups of reinforcing layers, and the insulating layers are used for preventing electric leakage of the battery cell; and two groups of flame-retardant layers. The battery core has relatively high insulation performance and protection performance, the safety of the battery core is effectively ensured, and fire disasters and safety accidents are prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of isolation films, in particular to a flame-retardant isolation film for battery cells. Background Art

[0002] With the popularization of electric vehicles, lithium-ion batteries will occupy an important market share. Among these batteries, the insulating film plays a crucial role. It can ensure that there is no short circuit between the metal electrode and the packaging aluminum foil under high-temperature and high-pressure environments, especially in power battery cells, thus preventing battery failure. Due to the flammable and explosive characteristics of power battery cells, they require the protection of flame-retardant insulating films even more. These thin film materials are crucial in the manufacturing process of lithium batteries and can effectively reduce the risk of fires and safety accidents.

[0003] However, the existing thin films are generally thin as a whole, with low insulation performance and protection performance, posing safety hazards to battery cells. In view of this, the utility model proposes a flame-retardant isolation film for battery cells. Summary of the Utility Model

[0004] The purpose of the utility model is to address the problem in the background art that the existing thin films are generally thin as a whole, with low insulation performance and protection performance, posing safety hazards to battery cells, and to propose a flame-retardant isolation film for battery cells.

[0005] The technical solution of the utility model: A flame-retardant isolation film for battery cells includes an isolation film main body. The isolation film main body includes a base material layer; buffer layers arranged on both sides of the base material layer, and the buffer layers are used to buffer external impact forces; two reinforcing layers, the two reinforcing layers are respectively arranged on one side of the two buffer layers away from the base material layer, and the reinforcing layers are used to improve the mechanical strength of the isolation film main body; two insulating layers, the two insulating layers are respectively arranged on one side of the two reinforcing layers away from the buffer layers, and the insulating layers are used to prevent battery cells from leaking electricity; two flame-retardant layers, the two flame-retardant layers are respectively arranged on one side of the two insulating layers away from the reinforcing layers, and the flame-retardant layers are used to prevent being burned through; an adhesive layer arranged on one side of one of the flame-retardant layers away from the insulating layer, and a release paper is adhered to the side of the adhesive layer away from the flame-retardant layer.

[0006] Optionally, the base material layer is made of polypropylene material, and the thickness of the base material layer is 10μm - 40μm.

[0007] Optionally, the buffer layer is made of polyimide material, and the thickness of the buffer layer is 5μm - 20μm.

[0008] Optionally, the reinforcing layer is made of glass fiber material, and the thickness of the reinforcing layer is 5μm - 20μm.

[0009] Optionally, the insulating layer is made of polyethylene material, and the thickness of the insulating layer is 5μm to 20μm.

[0010] Optionally, the flame retardant layer is made of fluoroplastic material, and the thickness of the flame retardant layer is 5μm to 20μm.

[0011] Optionally, the buffer layer has a honeycomb structure.

[0012] Optionally, the reinforcing layer is composed of multiple groups of warp and weft lines that crisscross.

[0013] In summary, the present application includes at least one of the following beneficial technical effects:

[0014] By providing the reinforcing layer, the mechanical strength of the isolation film body is improved by the multiple groups of warp and weft lines that crisscross, and the protection performance of the isolation film body is improved;

[0015] Furthermore, by providing two insulating layers and cooperating with the base material layer, both play an insulating role, improving the isolation effect of the isolation film body. Through the honeycomb structure of the buffer layer, external impacts are effectively absorbed, improving the stability of the isolation film body;

[0016] In summary, the present utility model has high insulation performance and protection performance, effectively ensuring the safety of the battery cell and preventing the occurrence of fires and safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of a flame retardant isolation film for a battery cell;

[0018] Figure 2 is Figure 1 a partial cross-sectional structural diagram of;

[0019] Figure 3 is a disassembled structural diagram of the isolation film body.

[0020] Reference numerals:

[0021] 1. Isolation film body;

[0022] 11. Base material layer; 12. Buffer layer; 13. Reinforcing layer; 14. Insulating layer; 15. Flame retardant layer; 16. Adhesive layer; 17. Release paper;

[0023] 131. Warp; 132. Weft. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model.

[0025] The components of the embodiments of the present utility model, which are usually described and shown in the accompanying drawings here, can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model.

[0026] All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the scope of protection of the present utility model.

[0027] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0028] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0029] Embodiment

[0030] As Figures 1-3 shown, a flame-retardant isolation film for a battery cell proposed by the present utility model includes an isolation film main body 1. The isolation film main body 1 includes a base material layer 11. The base material layer 11 is made of polypropylene material. The thickness of the base material layer 11 is 10 μm, and it has good chemical stability and electrical properties. It has a relatively high melting point and can maintain stability at a relatively high temperature, suitable for coping with the possible high-temperature environment of the battery. In addition, polypropylene also has good chemical corrosion resistance and can resist the erosion of chemical substances inside the battery, thereby extending the service life of the isolation film main body 1.

[0031] Furthermore, the above-mentioned isolation film includes buffer layers 12 provided on both sides of the substrate layer 11. The buffer layers 12 are used to buffer external impact forces. The thickness of the buffer layer 12 is 5 μm. The buffer layer 12 is made of polyimide material and has very excellent high-temperature stability and mechanical strength. It can maintain stability at relatively high temperatures, is not easily deformed or softened, and is suitable for use in high-performance batteries or applications that require high-temperature environments. The buffer layer 12 has a honeycomb structure, which can further buffer external impacts and improve the stability of the isolation film body 1.

[0032] Furthermore, the above-mentioned isolation film also includes two sets of reinforcing layers 13. The two sets of reinforcing layers 13 are respectively provided on the sides of the two buffer layers 12 away from the substrate layer 11. The reinforcing layer 13 is used to improve the mechanical strength of the isolation film body 1. The thickness of the reinforcing layer 13 is 5 μm. The reinforcing layer 13 is made of glass fiber material and has extremely high tensile strength and stiffness, which can significantly enhance the mechanical strength and tear resistance of the flame-retardant isolation film. It also has good high-temperature resistance performance and can maintain stability in the high-temperature operating environment of the battery. It can also effectively prevent the isolation film body 1 from being distorted and deformed, and improve its adaptability to batteries with complex shapes. The reinforcing layer 13 is composed of multiple sets of warp threads 131 and weft threads 132 that crisscross each other, and has a high tensile capacity, improving the mechanical properties of the isolation film body 1.

[0033] Furthermore, the above-mentioned isolation film also includes two sets of insulating layers 14. The two sets of insulating layers 14 are respectively provided on the sides of the two reinforcing layers 13 away from the buffer layer 12. The insulating layer 14 is used to prevent the battery core from leaking electricity. The thickness of the insulating layer 14 is 5 μm. The insulating layer 14 is made of polyethylene material and has good electrical insulation performance, and is usually softer and easier to process than polypropylene. It can effectively protect the structure of the battery and provide good adaptability in batteries with complex shapes.

[0034] Specifically, the above-mentioned isolation film includes two sets of flame-retardant layers 15. The two sets of flame-retardant layers 15 are respectively provided on the sides of the two insulating layers 14 away from the reinforcing layer 13. The flame-retardant layer 15 is used to prevent being burned through. The thickness of the flame-retardant layer 15 is 5 μm. The flame-retardant layer 15 is made of fluoroplastic material and has good fire resistance and chemical resistance, and at the same time also has good low surface energy and excellent voltage resistance performance.

[0035] Finally, the above-mentioned isolation film also includes an adhesive layer 16 provided on the side of one set of flame-retardant layer 15 away from the insulating layer 14. A release paper 17 is adhered to the side of the adhesive layer 16 away from the flame-retardant layer 15, which is convenient for bonding and fixing the isolation film body 1 through the adhesive layer 16 after the release paper 17 is peeled off.

[0036] In this embodiment, during use, the release paper 17 is peeled off, and the isolation film main body 1 is adhered to the battery cell position through the adhesive layer 16. At this time, the base material layer 11 can maintain stability at a relatively high temperature, suitable for coping with the possible high-temperature environment of the battery. In addition, it can also resist the erosion of chemical substances inside the battery, thereby extending the service life of the isolation film main body 1. The buffer layer 12 can maintain stability at a relatively high temperature, is not easily deformed or softened, and is suitable for use in high-performance batteries or applications that require a high-temperature environment. The honeycomb structure in the buffer layer 12 further buffers external impacts. The reinforcement layer 13 significantly enhances the mechanical strength and tear resistance of the flame-retardant isolation film. It has good high-temperature resistance performance and can maintain stability in the high-temperature operating environment of the battery. It can also effectively prevent the isolation film main body 1 from being twisted and deformed, improving its adaptability to batteries with complex shapes. The insulation layer 14 can effectively protect the structure of the battery and provide good adaptability in batteries with complex shapes. The flame-retardant layer 15 has good fire resistance and chemical resistance, and at the same time has good low surface energy and excellent breakdown voltage performance, preventing the battery cell from catching fire and causing a fire.

[0037] The above specific embodiment is only an optional embodiment of the present invention. Based on the technical solution of the present invention and the relevant inspiration of the above embodiment, those skilled in the art can make various alternative improvements and combinations to the above specific embodiment.

Claims

1. A flame-retardant isolation film for a battery cell, characterized in that, Comprising: An insulating film body (1), the insulating film body (1) comprising a base material layer (11); Buffer layers (12) disposed on both sides of the base material layer (11), the buffer layers (12) being used to buffer external impact forces; Two groups of reinforcing layers (13), the two groups of reinforcing layers (13) being respectively disposed on the sides of the two buffer layers (12) away from the base material layer (11), the reinforcing layers (13) being used to improve the mechanical strength of the insulating film body (1); Two groups of insulating layers (14), the two groups of insulating layers (14) being respectively disposed on the sides of the two reinforcing layers (13) away from the buffer layers (12), the insulating layers (14) being used to prevent leakage of the battery cell; Two groups of flame retardant layers (15), the two groups of flame retardant layers (15) being respectively disposed on the sides of the two insulating layers (14) away from the reinforcing layers (13), the flame retardant layers (15) being used to prevent being burned through; An adhesive layer (16) disposed on the side of one of the flame retardant layers (15) away from the insulating layer (14), and a release paper (17) is adhered to the side of the adhesive layer (16) away from the flame retardant layer (15).

2. The flame-retardant isolation film for a battery cell according to claim 1, wherein, The base material layer (11) is made of a polypropylene material, and the thickness of the base material layer (11) is 10μm to 40μm.

3. The flame-retardant isolation film for a battery cell according to claim 1, wherein, The buffer layer (12) is made of a polyimide material, and the thickness of the buffer layer (12) is 5μm to 20μm.

4. A flame-retardant isolation film for a battery cell according to claim 1, characterized in that, The reinforcing layer (13) is made of a glass fiber material, and the thickness of the reinforcing layer (13) is 5μm to 20μm.

5. A flame-retardant isolation film for a battery cell according to claim 1, characterized in that, The insulating layer (14) is made of a polyethylene material, and the thickness of the insulating layer (14) is 5μm to 20μm.

6. The flame-retardant isolation film for a battery cell according to claim 1, wherein, The flame retardant layer (15) is made of a fluoroplastic material, and the thickness of the flame retardant layer (15) is 5μm to 20μm.

7. The flame-retardant isolation film for a battery cell according to claim 3, wherein, The buffer layer (12) has a honeycomb structure.

8. A flame-retardant isolation film for a battery cell according to claim 4, characterized in that, The reinforcing layer (13) comprises a plurality of groups of warp threads (131) and weft threads (132) that are crisscrossed.

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