Safe metallized film
By setting metal layers of different widths and dividing grooves on both sides of the base film, the problem of heat uniformity during base film breakdown of metallized thin films was solved, and damage was reduced.
Patent Information
- Application Number
- CN202423135192.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-12-19
AI Technical Summary
When the base film of a conventional metallized thin film is punctured, the heat generated by the metal layers on both sides is the same, resulting in greater damage.
Design a safety metallized film, wherein a first and a second metal layer are respectively disposed on both sides of a base film, the width of the second metal layer is less than half the width of the base film, and a dividing groove is disposed on it, the metal layer is made of aluminum or zinc, and the thickness is equal to that of the first metal layer.
The damage caused by the base film being punctured is reduced by the design of the segmented groove and metal layer, which reduces heat generation and decreases the damaged area of the metal layer.
Smart Images
Figure CN223624827U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of thin film technology, and in particular to a safety metallized thin film. Background Technology
[0002] The core, formed by winding a metallized thin film, is the core component of a film capacitor. In existing technologies, a metallized thin film is deposited on one side of a base film. When winding it into a core, two metallized thin films are first stacked together with opposite width directions and the same thickness direction to form a metallized thin film pair. After this pair is wound into a core and the capacitor is manufactured, when the base film is punctured at some point, the metallized layers on both sides of the base film short-circuit, generating a large amount of heat. Because the thickness of the metal layers on both sides of the base film (one side's metal layer is on the base film, and the other side's metal layer is on another metallized thin film in the metallized thin film pair) is the same, the heat generated on both sides is essentially the same, resulting in significant damage. Utility Model Content
[0003] The technical problem to be solved by this utility model is to provide a safe metallized film in response to the above-mentioned technical deficiencies.
[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a safety metallized film, including a base film, a first metal layer disposed on one side of the base film, the width of the first metal layer being smaller than the width of the base film, one end of the first metal layer being flush with one end of the base film, and a margin area being disposed between the other end of the first metal layer and the other end of the base film, and a second metal layer disposed on the other side of the base film, the width of the second metal layer being less than half the width of the base film, and one end of the second metal layer being flush with the end of the base film where the margin area is disposed.
[0005] To further optimize this technical solution, a plurality of dividing grooves are provided on the second metal layer. The extending direction of the dividing grooves is parallel to the width direction of the base film, and the dividing grooves penetrate the second metal layer in both the thickness and width directions.
[0006] To further optimize this technical solution, the metal layer is made of aluminum or zinc.
[0007] To further optimize this technical solution, the thickness of the second metal layer is equal to that of the first metal layer.
[0008] Compared with the prior art, the present invention has the following advantages: a first metal layer and a second metal layer are respectively provided on both sides of the base film, and the two ends of the base film are respectively flush with one end of the two metal layers. The width of the second metal layer is less than half the width of the base film, so that when the capacitor made by the core of the metallized film wound by the present application is punctured at a certain point of the base film, the damage is small. Attached Figure Description
[0009] Figure 1 This is a schematic diagram of the structure of a safety-type metallized thin film.
[0010] Figure 2 for Figure 1 A magnified view of point I in the middle.
[0011] Figure 3 This is a schematic diagram of the structure of a metallized thin film pair.
[0012] Figure 4 This is a schematic diagram showing the state of adjacent metallized film pairs after they have been wound into a core.
[0013] In the figure: 1. Base film; 2. First metal layer; 3. Second metal layer; 31. Dividing groove; 4. Edge area. Detailed Implementation
[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.
[0015] Detailed implementation method: combined with Figure 1-4 As shown, a safety-type metallized film includes a base film 1, which is made of an organic film such as polypropylene. A first metal layer 2 is disposed on one side of the base film 1. The width of the first metal layer 2 is smaller than the width of the base film 1, and the thickness of the first metal layer 2 should be appropriately thin. One end of the first metal layer 2 is flush with one end of the base film 1. A margin area 4 is provided between the other end of the first metal layer 2 and the other end of the base film 1. A second metal layer 3 is disposed on the other side of the base film 1. The width of the second metal layer 3 is less than half the width of the base film 1, and one end of the second metal layer 3 is flush with the end of the base film 1 where the margin area 4 is provided. The metallized films of this application are stacked together with opposite orientations in the width direction and the same orientation in the thickness direction to form... Figure 3 The metallized film pair shown has the second metal layer 3 on the upper metallized film in contact with the first metal layer 2 on the lower metallized film. After the metallized film pair is wound into a core, the first metal layer 2 on one metallized film contacts the second metal layer 3 on the other metallized film, increasing the total thickness of the metal layer at the second metal layer 3 (because it includes the thickness of the first metal layer 2). This reduces the resistance and increases the conductivity compared to when only the first metal layer 2 is present. After the metallized film pair is wound into a core, combined with... Figure 4As shown, on the other side of the base film 1 adjacent to the second metal layer 3, there is only one first metal layer 2. Therefore, when a certain point of the base film 1 located at the second metal layer 3 is broken down, the heat generated by the second metal layer 3 and the corresponding first metal layer 2 is less than the heat generated by the first metal layer 2 located on the other side of the base film 1 (because the maximum current at a certain point of the first metal layer 2 when it burns out or evaporates under the same thickness and other conditions is basically constant, and the heat generated at the point where the resistance of the second metal layer 3 and the first metal layer 2 overlaps is reduced when the current is basically constant), resulting in less damage. Since the current gradually increases from one end of the first metal layer 2 near the edge area 4 to the other end, the first metal layer 2 can be thinner than the metal layer on the metallized thin film of the prior art when the maximum allowable current of the capacitor is the same. In this case, it is easier to burn out, and the maximum current at a certain point when it burns out or evaporates will also be reduced, further reducing the damage.
[0016] The second metal layer 3 is provided with a plurality of dividing grooves 31. The extending direction of the dividing grooves 31 is parallel to the width direction of the base film 1. The dividing grooves 31 penetrate the second metal layer 3 in both the thickness and width directions. The width of the dividing grooves 31 is preferably about 0.5 mm. When two adjacent base film layers 1 in the core are simultaneously punctured, the first metal layer 2 at the dividing groove 31 around that location is burned off first. This prevents the first metal layer 2 and the second metal layer 3 outside the dividing groove 31 from passing current through the metal layer at that location (the current can only be conducted through the end of the metal layer away from the edge area 4). As a result, the metal layer at that location is relatively easy to burn off, and it is not easy to affect the metal layer outside the dividing groove 31 at that location.
[0017] The metal layer is made of aluminum or zinc.
[0018] The second metal layer 3 has the same thickness as the first metal layer 2. In this case, the width of the second metal layer 3 is close to half the width of the base film 1. Under the condition that the maximum current of the capacitor is the same, the first metal layer 2 can be about half the thickness of the metal layer on the metallized thin film in the prior art. Therefore, when the base film 1 is broken down, the first metal layer 2 (where it is not in contact with the second metal layer 3) is more likely to be burned off and evaporated, so the damaged area of the first metal layer 2 is smaller.
[0019] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.
Claims
1. A safety-type metallized thin film, comprising a base film (1), wherein a first metal layer (2) is disposed on one side of the base film (1), the width of the first metal layer (2) is smaller than the width of the base film (1), one end of the first metal layer (2) is flush with one end of the base film (1), and a margin area (4) is disposed between the other end of the first metal layer (2) and the other end of the base film (1), characterized in that: A second metal layer (3) is provided on the other side of the base film (1). The width of the second metal layer (3) is less than half the width of the base film (1). One end of the second metal layer (3) is flush with the end of the base film (1) where the edge area (4) is provided.
2. The safety-grade metallized thin film according to claim 1, characterized in that: The second metal layer (3) is provided with a plurality of dividing grooves (31). The extending direction of the dividing grooves (31) is parallel to the width direction of the base film (1). The dividing grooves (31) penetrate the second metal layer (3) in the thickness and width directions respectively.
3. The safety metallized thin film according to claim 1, characterized in that: The metal layer is made of aluminum or zinc.
4. A safety-type metallized thin film according to any one of claims 1-3, characterized in that: The second metal layer (3) has the same thickness as the first metal layer (2).