Lithium battery insulating flame-retardant PC film

Abstract

The utility model relates to the technical field of PC (Poly Carbonate) films, in particular to an insulating flame-retardant PC film for a lithium battery. According to the technical scheme, the PC film comprises a film body structure, the film body structure comprises a plurality of film splicing blocks, connecting strips are arranged on the peripheries of the multiple sets of film splicing blocks, and the connecting strips are used for splicing the multiple sets of film splicing blocks into the complete PC film; each film splicing block comprises a bonding layer, a fireproof layer, an insulating layer and a protective assembly, and the bonding layer, the fireproof layer, the insulating layer and the protective assembly are arranged in sequence; the protection assembly comprises a plurality of first arc-shaped protrusions arranged on the outer side of the insulating layer, and the outer walls of every four sets of first arc-shaped protrusions are each provided with a set of second arc-shaped protrusions. The PC film disclosed by the utility model is provided with the plurality of first arc-shaped bulges, so that the anti-collision and wear-resistant properties of the film are enhanced, the anti-collision, insulated and wear-resistant effects are achieved, the protection property of the PC film is improved, the service life of a battery is prolonged, the film is more convenient to cut due to the arrangement of the connecting strips, and the PC film is more convenient to use.

Description

Technical Field

[0001] The utility model relates to the technical field of PC films, in particular to a lithium battery insulating and flame-retardant PC film. Background Technique

[0002] The PC film is a polycarbonate film with excellent heat resistance, chemical resistance and mechanical strength, so it is widely used in lithium batteries. From the perspective of materials: As an electrolyte separator, the PC film can effectively isolate the positive and negative electrodes, prevent short circuits and ensure the safety performance of the battery. At the same time, the PC film has high thermal stability and can maintain a stable structure at higher temperatures, which is of great significance for the high-temperature working environment of lithium batteries. From the perspective of battery performance: The use of the PC film can improve the cycle life and safety performance of lithium batteries. The PC film can effectively prevent the direct contact of lithium ions between the positive and negative electrodes, thereby reducing the possibility of inter-pole short circuits and extending the service life of the battery. In addition, the high conductivity of the PC film also helps to improve the charge and discharge efficiency of the battery.

[0003] The existing lithium battery insulating and flame-retardant PC film only uses a single-layer wrapping, and the corners of lithium batteries are often very sharp, and it is extremely easy for the PC film to be worn and cut and damaged when covering them. A lithium battery insulating and flame-retardant PC film proposed in Patent CN213546423U is provided with a right-angle bin to buffer when the battery is impacted. However, this solution can only protect the corners of the lithium battery, and there are still defects in the wear resistance of the outer wall of the lithium battery. At the same time, the existing PC film is a whole, which is not convenient to be torn off in a modular manner for use and needs to be cut, and the process is complicated. Therefore, this application proposes an insulating and flame-retardant PC film that is convenient to be torn off in a modular manner and improves the service life of lithium batteries. Summary of the Invention

[0004] The purpose of the utility model is to propose an insulating and flame-retardant PC film that is convenient to be torn off in a modular manner and improves the service life of lithium batteries in view of the problems existing in the background technique.

[0005] The technical solution of the utility model: A lithium battery insulating and flame-retardant PC film, including a film main body structure, the film main body structure includes a plurality of film splicing blocks, and connecting strips are arranged on the outer periphery of multiple groups of the film splicing blocks, and the connecting strips are used to assemble multiple groups of film splicing blocks into a complete PC film;

[0006] The film splicing block includes an adhesive layer, a fireproof layer, an insulating layer and a protection component, and the adhesive layer, the fireproof layer, the insulating layer and the protection component are arranged in sequence;

[0007] The protection component includes a plurality of first arc-shaped protrusions arranged on the outer side of the insulating layer, and a group of second arc-shaped protrusions are arranged on the outer walls of every four groups of the first arc-shaped protrusions.

[0008] Optionally, the connecting strip is made of a high-temperature resistant material, and its connection method with the film splicing block is seamless splicing.

[0009] Optionally, the material of the bonding layer is high-strength PC material, the material of the fireproof layer is ceramic fiber, and the material of the insulating layer is phosphorus-containing flame retardant.

[0010] Optionally, both the first arc-shaped protrusion and the second arc-shaped protrusion are arc-shaped protrusions.

[0011] Optionally, a plurality of reinforcing ribs arranged in a wavy shape are provided in the fireproof layer.

[0012] Optionally, elastic particles are filled in the first arc-shaped protrusion.

[0013] Optionally, an air chamber is provided between the first arc-shaped protrusion and the second arc-shaped protrusion.

[0014] Optionally, the first arc-shaped protrusion and the second arc-shaped protrusion are made of elastic rubber material.

[0015] In summary, the present application includes at least one of the following beneficial technical effects:

[0016] Through the arrangement of the connecting strip in the present application, it is convenient to assemble the film splicing blocks in a modular manner, convenient to tear and use the film splicing blocks, reducing the cutting use steps, and the application of the PC film is more convenient;

[0017] Through the arrangement of the first arc-shaped protrusion and the second arc-shaped protrusion in the present application, the wear resistance of the film main structure is increased, filling elastic particles in the first arc-shaped protrusion improves the fire resistance of the film main structure, and through the arrangement of the air chamber, the impact on the battery from the outside is buffered, prolonging the service life of the battery;

[0018] In summary, the PC film of the present application has a plurality of first arc-shaped protrusions, enhancing the anti-collision and wear resistance of the film, having prominent wear resistance, insulation and anti-collision effects, improving the protection performance of the PC film, prolonging the service life of the battery, and the arrangement of the connecting strip makes it more convenient to cut and use the film, and the use of the PC film is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The overall schematic diagram of the present invention is given;

[0020] Figure 2 The front view schematic diagram of the sectional structure of the present invention is given;

[0021] Figure 3 The partial structure schematic diagram of the present invention is given;

[0022] Figure 4 is Figure 3 Another perspective structure schematic diagram of.

[0023] Reference numerals:

[0024] 1. Membrane main structure;

[0025] 11. Membrane splicing block; 110. Adhesive layer; 111. Insulating layer; 112. Fireproof layer; 113. Reinforcing rib;

[0026] 12. Connecting strip;

[0027] 13. Protection component; 130. First arc-shaped protrusion; 131. Elastic particle; 132. Air chamber; 133. Second arc-shaped protrusion. Detailed implementation manners

[0028] The technical solutions of the present disclosure will be described clearly and completely below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments.

[0029] The components of the embodiments of the present disclosure 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 disclosure provided in the accompanying drawings is not intended to limit the scope of the claimed present disclosure, but merely represents selected embodiments of the present disclosure.

[0030] All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present disclosure without creative efforts shall fall within the scope of protection of the present disclosure.

[0031] In the description of the present disclosure, 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 disclosure 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 thus should not be construed as a limitation of the present disclosure.

[0032] In the description of the present disclosure, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "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 disclosure can be understood according to specific circumstances.

[0033] Embodiment 1

[0034] As Figures 1-4As shown in the figure, a lithium battery insulating and flame-retardant PC film proposed by the present utility model includes a film main body structure 1. The film main body structure 1 includes a plurality of film splicing blocks 11. A connecting strip 12 is arranged on the outer periphery of multiple groups of film splicing blocks 11. The connecting strip 12 is used to assemble multiple groups of film splicing blocks 11 into a complete PC film. The connecting strip 12 is made of a high-temperature resistant material, and its connection method with the film splicing block 11 is seamless splicing. The high-temperature resistant seamless splicing of the connecting strip 12 ensures the integrity and stability of the film. Such a design can effectively protect the lithium battery and reduce the risk of battery failure or danger caused by external factors;

[0035] The film splicing block 11 includes an adhesive layer 110, a fireproof layer 112, an insulating layer 111, and a protection component 13. The structural design and material selection of the protection component 13 are beneficial to improving the insulation and buffering properties, and the adhesive layer 110, the fireproof layer 112, the insulating layer 111, and the protection component 13 are arranged in sequence; the material of the adhesive layer 110 is a high-strength PC material, the material of the fireproof layer 112 is ceramic fiber, and a plurality of reinforcing ribs 113 arranged in a wavy shape are arranged in the fireproof layer 112; the material of the insulating layer 111 is a phosphorus-containing flame retardant.

[0036] In this embodiment, the seamless connection of the adhesive layer 110, the fireproof layer 112, and the insulating layer 111 realizes the integrity of the PC film. The filling of the reinforcing ribs 113 improves the strength and toughness of the PC film. Through the setting of the connecting strip 12, the film main body structure 1 can be easily separated and torn as a whole, which is convenient for the use of the PC film.

[0037] Embodiment 2

[0038] As Figures 1-4 shown, based on Embodiment 1, the protection component 13 includes a plurality of first arc-shaped protrusions 130 arranged on the outer side of the insulating layer 111. Elastic particles 131 are filled in the first arc-shaped protrusions 130. The filling of the first arc-shaped protrusions 130 is beneficial to enhancing the impact and drop resistance performance of the film main body structure 1 and protecting the battery main body;

[0039] As Figure 3 and Figure 4 shown, a group of second arc-shaped protrusions 133 are arranged on the outer walls of every four groups of first arc-shaped protrusions 130. The first arc-shaped protrusions 130 and the second arc-shaped protrusions 133 are made of elastic rubber; both the first arc-shaped protrusions 130 and the second arc-shaped protrusions 133 are arc-shaped protrusions. The setting of the arc-shaped protrusions improves the overall protection performance of the film. An air chamber 132 is arranged between the first arc-shaped protrusions 130 and the second arc-shaped protrusions 133. When the battery main body is externally impacted, the air chamber 132 forms a rebounding effect, and the protection component 13 covers the entire film splicing block 11 to form a comprehensive protection.

[0040] The above specific embodiments are merely several alternative embodiments of the present utility model. Based on the technical solution of the present utility model and the relevant inspirations of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A flame-retardant PC film for lithium battery insulation, comprising a main film structure (1), characterized in that: The membrane main body structure (1) comprises a plurality of membrane splicing blocks (11), and the outer peripheries of the plurality of groups of membrane splicing blocks (11) are provided with connecting strips (12), and the connecting strips (12) are used to assemble the plurality of groups of membrane splicing blocks (11) into a complete PC membrane; The membrane splicing block (11) comprises an adhesive layer (110), a fireproof layer (112), an insulating layer (111) and a protective component (13), and the adhesive layer (110), the fireproof layer (112), the insulating layer (111) and the protective component (13) are arranged in sequence; The protection component (13) comprises a plurality of first arc-shaped protrusions (130) arranged outside the insulating layer (111), and a group of second arc-shaped protrusions (133) are arranged on the outer wall of each four groups of the first arc-shaped protrusions (130).

2. The flame-retardant PC film for lithium battery insulation according to claim 1, characterized in that: The connecting strip (12) is made of high temperature resistant material, and is connected to the membrane splicing block (11) in a seamless manner.

3. The flame-retardant PC film for lithium battery insulation according to claim 1, characterized in that: The material of the bonding layer (110) is a high-strength PC material, the material of the fireproof layer (112) is ceramic fiber, and the material of the insulating layer (111) is a phosphorus-containing flame retardant.

4. The flame-retardant PC film for lithium battery insulation according to claim 1, characterized in that: The first arc-shaped protrusion (130) and the second arc-shaped protrusion (133) are both arc-shaped protrusions.

5. The flame-retardant PC film for lithium battery insulation according to claim 1, characterized in that: A plurality of reinforcing ribs (113) arranged in a wave shape are arranged in the fireproof layer (112).

6. The flame-retardant PC film for lithium battery insulation according to claim 1, characterized in that: The first arc-shaped protrusion (130) is filled with elastic particles (131).

7. The flame-retardant PC film for lithium battery insulation according to claim 1, characterized in that: An air chamber (132) is provided between the first arc-shaped protrusion (130) and the second arc-shaped protrusion (133).

8. The flame-retardant PC film for lithium battery insulation according to claim 1, characterized in that: The first arc-shaped protrusion (130) and the second arc-shaped protrusion (133) are made of elastic rubber material.

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