A battery radiation protection film with bidirectional conductive layer

Abstract

The utility model provides a kind of battery radiation protection film with two-way conductive layer, including base film layer, first conductive layer and second conductive layer are respectively covered in the opposite sides of base film layer;Through hole for making two sides conductive layer electrically connected is equipped on base film layer, through hole penetrates base film layer and fills conductive material;The side of first conductive layer away from base film layer is provided with adhesive layer for attaching protective film to battery shell;At least one of first conductive layer and second conductive layer is connected with conductive lead-out part, to be connected with battery shell or external ground, form two-way conductive shielding layer around battery.Base film layer can be polyester film, polyimide film or polyolefin film, conductive layer can be formed by metal plating, conductive coating or metal mesh film, through hole can be filled with silver paste, copper paste or carbon paste.Protective film can be provided with positioning hole and can form sheet or roll-shaped covering structure.The utility model improves battery electromagnetic shielding and static discharge performance, improves use safety.

Description

Technical Field

[0001] This utility model relates to the technical field of film bags, and in particular to a battery radiation protection film with a bidirectional conductive layer. Background Technology

[0002] With the widespread application of lithium-ion batteries, power batteries, and energy storage batteries in automobiles, drones, portable devices, and energy storage systems, batteries are subject to external electromagnetic radiation, electrostatic interference, and electromagnetic noise generated by high-frequency electronic components within the devices during operation. To reduce the impact of these interferences on battery performance and lifespan, a protective film is typically applied to the battery surface to provide a certain degree of shielding and isolation. However, most existing battery protective films employ a single-sided conductive structure, which cannot form a complete, encapsulated electromagnetic shielding layer around the battery, resulting in limited shielding effectiveness.

[0003] In battery structures, the battery casing has a high degree of metallization, a compact surface layout, and many curved surfaces. It also needs to avoid sensitive areas such as electrode tabs, temperature control devices, etc. Therefore, the protective film not only needs to have good adhesion but also needs to differentiate between conductive, radiation-proof, and insulating areas. However, single-sided conductive films can only provide a unidirectional conductive path and are difficult to achieve bidirectional diffusion and dissipation of charge within the film. This means that static electricity accumulation can still form localized buildups on the battery surface, posing a potential safety hazard.

[0004] Furthermore, after existing protective films are attached to the battery casing, their outer surface is usually still exposed to the air, making it impossible to form an electrically closed shielding circuit with the battery casing. This means that the ungrounded conductive layer on the outside cannot effectively participate in electromagnetic shielding. The conventional method of achieving conductivity of the outer shielding layer by adding metal foil or conductive adhesive strips not only increases the number of process steps but also lacks reliability, as it is prone to detachment or open circuit due to bending, friction, or aging.

[0005] In view of this, the inventors have specifically designed a battery radiation protection film with a bidirectional conductive layer, which leads to this invention. Utility Model Content

[0006] (a) Technical problems to be solved The purpose of this application is to provide a battery radiation protection film with a bidirectional conductive layer, which at least solves the problem that existing battery protective films only have a single-sided conductive structure and cannot form a complete encapsulated shielding layer, resulting in insufficient electromagnetic radiation shielding and difficulty in bidirectional static discharge.

[0007] (II) Technical Solution To solve the above-mentioned technical problems, this utility model provides the following technical solution: This application provides a battery radiation protection film with a bidirectional conductive layer, including a base film layer. The base film layer is covered with a first conductive layer and a second conductive layer on its opposite sides, respectively. The base film layer is provided with a conductive structure for electrically connecting the first conductive layer and the second conductive layer. The conductive structure includes a through hole that penetrates the base film layer and is filled with conductive material. An adhesive layer for attaching the protective film to the battery casing is provided on the side of the first conductive layer opposite to the base film layer. At least one of the first conductive layer and the second conductive layer is connected to a conductive lead for electrical connection with the battery casing or an external grounding terminal, thereby forming a bidirectional conductive shielding layer surrounding the battery.

[0008] In a further embodiment, the base film layer is one of a polyester film layer, a polyimide film layer, or a polyolefin film layer.

[0009] In a further embodiment, the first conductive layer and the second conductive layer are formed by a metal plating, a conductive coating, or a metal mesh film.

[0010] In a further embodiment, the vias are uniformly arrayed on the base film layer, and the conductive material filled in the vias is silver paste, copper paste, or conductive carbon paste.

[0011] In a further embodiment, the conductive structure also includes an edge-sealing connection portion that folds the first conductive layer and the second conductive layer outward at the edge of the base film layer and overlaps them.

[0012] In a further embodiment, the edge-sealing connection portion is continuously formed along the periphery of the base film layer, so that the first conductive layer and the second conductive layer form an integral electrical connection in the circumferential direction.

[0013] In a further embodiment, the adhesive layer is a conductive adhesive layer, so that the first conductive layer is conductively connected to the battery casing.

[0014] In a further embodiment, the conductive lead-out portion is a metal foil.

[0015] In a further embodiment, positioning holes are provided on the base film layer.

[0016] In a further embodiment, the protective film is formed into a sheet or roll structure, and when applied, the edges of the protective film overlap each other and are bonded and fixed by an adhesive layer to form a ring-shaped covering structure.

[0017] (III) Beneficial Effects Compared with the prior art, the present invention has the following advantages: By setting a first conductive layer and a second conductive layer on both sides of the base film layer, and using a through-hole structure that penetrates the base film layer and is filled with conductive material, the two conductive layers can form a reliable electrical connection, thereby constructing a complete closed bidirectional conductive shielding layer, effectively improving the electromagnetic shielding capability of the battery. At the same time, the conductive adhesive layer is directly connected to the battery casing, allowing static electricity and interference signals to be quickly discharged, improving the defects of static electricity accumulation and uneven shielding in traditional single-sided conductive films. The setting of the edge-sealing connection part and the conductive lead-out part of the metal foil further enhances the overall conductivity and grounding reliability of the shielding layer. In addition, the positioning hole and the rollable structure make the protective film easy to install and adaptable to battery casings of different sizes, thereby improving the overall radiation resistance, safety and stability of the battery.

[0018] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0019] in: Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model. Figure 1 ; Figure 2 This is a schematic diagram of the overall structure of one embodiment of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the overall structure of another embodiment of the present utility model. Figure 1 ; Figure 4 This is a schematic diagram of the overall structure of another embodiment of the present invention. Figure 2 .

[0020] Label Explanation: 1. Base film layer; 2. First conductive layer; 3. Second conductive layer; 4. Conductive structure; 5. Adhesive layer; 6. Conductive lead-out part; 7. Conductive material; 8. Positioning hole. Detailed Implementation

[0021] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0022] Such as 1 and Figure 2As shown, this utility model discloses a battery radiation protection film with a bidirectional conductive layer. The film has a sheet-like or roll-shaped flexible thin film structure and can be adhered to the outer surface of the battery casing to construct a bidirectional conductive shielding layer around the battery, thereby improving electromagnetic radiation shielding and electrostatic discharge performance. The protective film mainly includes a base film layer 1, a first conductive layer 2, a second conductive layer 3, a conductive structure 4, an adhesive layer 5, and conductive lead-out parts 6. These components are connected in a stacked manner, resulting in a thin, flexible, and highly adherent overall structure.

[0023] Specifically, in this embodiment, the base film layer 1 is a flexible polymer film, preferably a polyester film, polyimide film, or polyolefin film, to ensure excellent heat resistance, dimensional stability, and mechanical strength. The base film layer 1 serves as the main supporting layer of the entire protective film, with a first conductive layer 2 and a second conductive layer 3 respectively coated on its opposite sides. Both layers are typically formed using metal plating, conductive coatings, or metal mesh films, exhibiting a continuous metallic surface structure. The first conductive layer 2 is disposed on the side of the base film layer 1 facing the battery casing, and the second conductive layer 3 is disposed on the side away from the battery, ensuring good conductivity and shielding effect on both sides of the protective film.

[0024] To achieve electrical connectivity between the two conductive layers, forming a closed and continuous shielding loop, this invention incorporates a conductive structure 4 on the base film layer 1. The conductive structure 4 includes multiple through-holes penetrating the base film layer 1. These through-holes are evenly arrayed within the effective area of ​​the base film layer 1. The conductive material 7 filling the through-holes is a highly conductive material such as silver paste, copper paste, or conductive carbon paste, enabling a stable and reliable vertical conductive connection between the first conductive layer 2 and the second conductive layer 3 through the through-holes. This conductive method allows the conductive layers on both sides to form an integral electrical connection across the entire film surface, facilitating the construction of a complete bidirectional conductive shielding layer.

[0025] like Figure 3 and Figure 4 As shown, in another embodiment, the conductive structure 4 may also include an edge-sealing connection portion disposed at the edge of the base film layer 1. By folding the first conductive layer 2 and the second conductive layer 3 outward and overlapping them in the edge region of the film, the two form a circumferentially electrically closed structure at the periphery, thereby further enhancing the integrity and anti-interference effect of the shielding layer.

[0026] To ensure a secure adhesion of the protective film to the outer surface of the battery casing and to guarantee a good electrical connection between the first conductive layer 2 and the metal casing, this invention provides an adhesive layer 5 on the side of the first conductive layer 2 facing away from the base film layer 1. The adhesive layer 5 can be a conductive adhesive layer, allowing the protective film to be directly connected to the battery casing after application, achieving reliable electrostatic discharge and shielding current guidance. The adhesive layer 5 is relatively thin, not affecting overall flexibility, and can adapt to battery structures of different shapes.

[0027] like Figures 1 to 4 As shown, after the bidirectional conductive layers are connected to form a complete shielding structure, to ensure that the shielding layer can be connected to the system ground or the common node of the battery pack, this invention provides a conductive lead-out portion 6. The conductive lead-out portion 6 can be a metal foil, one end of which is electrically fixedly connected to the first conductive layer 2 and / or the second conductive layer 3, and the other end extends from the edge of the protective film for welding, riveting, or pressing to the battery casing, busbar, or external grounding terminal. This structure ensures that the shielding layer can achieve effective electrical contact with the system after completely encapsulating the battery, enhancing the reliability of electromagnetic shielding and electrostatic discharge paths.

[0028] Furthermore, to ensure accurate alignment of the protective film during installation, positioning holes 8 can be provided on the base film layer 1 of this invention. The positioning holes 8 can be circular, rectangular, or other suitable shapes, corresponding to pre-set protrusions, holes, or edge features on the battery casing, thereby enabling rapid positioning during application, improving installation efficiency, and preventing application misalignment. Simultaneously, the protective film of this invention can be manufactured as a sheet or roll structure. After being cut according to the battery size, its edges are overlapped and bonded using the adhesive layer 5, forming a closed covering structure surrounding the battery surface.

[0029] Through the above structural configuration, this invention can form a double-sided conductive, multi-point connected encapsulated shielding layer on the battery surface. This allows electromagnetic radiation to be effectively absorbed and dissipated through the shielding circuit formed by the conductive layer and the through-holes. Simultaneously, static charge can be quickly discharged along the conductive layer to the battery casing or grounding point, overcoming the technical shortcomings of traditional single-sided conductive protective films, such as difficulty in constructing a complete shielding path and insufficient static discharge. Furthermore, the combination of positioning holes 8 and flexible film material gives this protective film excellent adhesion and ease of installation, making it suitable for battery applications of various shapes and sizes.

[0030] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A battery radiation protection film with a bidirectional conductive layer, comprising a base film layer, characterized in that: The base film layer is covered with a first conductive layer and a second conductive layer on its opposite sides, respectively. The base film layer is provided with a conductive structure for electrically connecting the first conductive layer and the second conductive layer. The conductive structure includes a through hole that penetrates the base film layer and is filled with conductive material. An adhesive layer for attaching the protective film to the battery casing is provided on the side of the first conductive layer opposite to the base film layer. At least one of the first conductive layer and the second conductive layer is connected to a conductive lead for electrical connection with the battery casing or an external grounding terminal, thereby forming a bidirectional conductive shielding layer surrounding the battery.

2. The battery radiation protection film with a bidirectional conductive layer according to claim 1, characterized in that, The base film layer is one of a polyester film layer, a polyimide film layer, or a polyolefin film layer.

3. The battery radiation protection film with a bidirectional conductive layer according to claim 1, characterized in that, The first conductive layer and the second conductive layer are formed by metal plating, conductive coating or metal mesh film.

4. A battery radiation protection film with a bidirectional conductive layer according to any one of claims 1 to 3, characterized in that, The vias are uniformly arrayed on the base film layer, and the conductive material filled in the vias is silver paste, copper paste or conductive carbon paste.

5. A battery radiation protection film with a bidirectional conductive layer according to claim 1, characterized in that, The conductive structure also includes an edge-sealing connection portion that folds the first conductive layer and the second conductive layer outward at the edge of the base film layer and overlaps them.

6. A battery radiation protection film with a bidirectional conductive layer according to claim 5, characterized in that, The edge-sealing connection portion is continuously formed along the periphery of the base film layer, so that the first conductive layer and the second conductive layer form an integral electrical connection in the circumferential direction.

7. A battery radiation protection film with a bidirectional conductive layer according to claim 1, characterized in that, The adhesive layer is a conductive adhesive layer, so that the first conductive layer is electrically connected to the battery casing.

8. A battery radiation protection film with a bidirectional conductive layer according to claim 1, characterized in that, The conductive lead-out part is a metal foil.

9. A battery radiation protection film with a bidirectional conductive layer according to claim 1, characterized in that, The base film layer is provided with positioning holes.

10. A battery radiation protection film with a bidirectional conductive layer according to claim 1, characterized in that, The protective film is formed into a sheet or roll structure. When applied, the edges of the protective film overlap and are fixed by an adhesive layer to form a ring-shaped covering structure.

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