Explosion-proof metallized film for photovoltaic inverter capacitor
By designing an explosion-proof metallized film on the capacitors of photovoltaic inverters and adopting a grid-part sheet resistance and shielding structure, the problem of capacitor explosion has been solved, improving safety and lifespan, and reducing production costs.
Patent Information
- Application Number
- CN202520009346.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-02
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-01-02
AI Technical Summary
Existing photovoltaic inverter capacitors lack effective technical support for explosion prevention, making them prone to catching fire and causing explosions. Furthermore, the lifespan and reliability of thin-film capacitors are insufficient.
Design an explosion-proof metallized membrane, which adopts a grid section sheet resistor, a shielding strip A and a shielding strip B structure. The width of the grid section sheet resistor is greater than 4/5 of the membrane width, and the width of the shielding strips A and B is less than 1/10 of the membrane width. The grid section sheet resistor is provided with a metal plating layer and is connected by blank mesh edges C to form a fuse structure to break the circuit and prevent explosion in the event of overvoltage.
This technology improves capacitor safety and efficiency, reduces production costs, and extends capacitor lifespan without adding extra explosion-proof structures.
Smart Images
Figure CN223842773U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of capacitor technology, and in particular to an explosion-proof metallization film for use on photovoltaic inverter capacitors. Background Technology
[0002] Photovoltaic inverters need to meet various functional requirements, not only ensuring DC / AC conversion but also guaranteeing the quality of output power. As end customers and designers increase their demands for the efficiency and reliability of these devices, photovoltaic inverters are developing towards simpler topologies, fewer components, and higher modularity. Thin-film capacitors are widely used in photovoltaic inverters due to their excellent and stable performance and long-term reliable lifespan. However, currently available photovoltaic inverter capacitors lack particularly effective technical support for explosion prevention, making them prone to catching fire and potentially exploding during use. Utility Model Content
[0003] The purpose of this invention is to provide an explosion-proof metallized film for photovoltaic inverter capacitors. This explosion-proof metallized film is not easy to catch fire, effectively preventing capacitor explosions. Moreover, the thin-film capacitor, with its excellent and stable performance and long-term reliable lifespan, effectively balances the explosion-proof performance and lifespan of the capacitor, thereby meeting customer requirements and overcoming the shortcomings of the prior art.
[0004] The technical solution of this utility model is as follows: an explosion-proof metallized film for a photovoltaic inverter capacitor, comprising a plastic film, a metal plating layer within the plastic film, the metallized film comprising a grid sheet resistor, a screen strip A, and a screen strip B, wherein the width of the grid sheet resistor is greater than 4 / 5 of the film width, and the widths of both screen strip A and screen strip B are less than 1 / 10 of the film width, and screen strip A and screen strip B are blank transparent unplated areas, and the grid sheet resistor is provided with a metal plating layer, characterized in that: the grid sheet resistor comprises several parallel grids, adjacent grids are separated by blank grid edges C, the blank grid edges C are provided with grid safety, adjacent grids are connected by grid safety, one end of the blank grid edge C is connected to screen strip A, and the other end is connected to screen strip B.
[0005] Furthermore, the grid sheet resistance is located in the middle of the plastic film, the grid safety is located in the middle of screen strip A and screen strip B, the angle between the blank mesh edge C and screen strip B is between 80 degrees and 90 degrees, and the blank mesh edge C is formed by the unplated area on the surface of the plastic film.
[0006] Furthermore, the width of screen band A is L2 = 1.0 ± 0.5 mm, the width of screen band B is L3 = 1.0 ± 0.5 mm, and the grid height is L7 = 33.0 ± 0.5 mm.
[0007] Furthermore, the angle between the blank mesh edge C and the screen strip B(3) is 89 degrees.
[0008] The above technical solution has the following beneficial effects:
[0009] The explosion-proof metallized film provided by this utility model, while possessing the "self-healing" properties of ordinary metallized films, utilizes a special structural design of the metallized electrode plate. The transverse warp lines in the middle of the strip grid coating adopt a fuse structure. When the voltage is too high, the instantaneous high temperature generated by the fuse breakdown will cause the warp lines to break the circuit, thereby cutting off the current and achieving the explosion-proof function. No additional explosion-proof structure is required, which improves work efficiency, reduces production costs, and achieves the effect of capacitor safety protection. Moreover, the explosion-proof and lifespan are effectively balanced. According to customer feedback, the lifespan of the capacitor formed by this film meets customer requirements.
[0010] The safety film capacitor of this invention is mainly used in the field of photovoltaic inverters. Under the same design, the ultimate withstand voltage of the safety film is higher than that of ordinary film. The safety film design can reduce the sheet resistance on the film, thereby improving the current carrying capacity of the capacitor. Attached Figure Description
[0011] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.
[0012] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.
[0013] Figure 1 This is a schematic diagram of the structure of the explosion-proof metallized film of this utility model. Detailed Implementation
[0014] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.
[0015] See Figure 1As shown, this utility model discloses an explosion-proof metallized film for a photovoltaic inverter capacitor, comprising a plastic film and a metal plating layer inside the plastic film. The metallized film includes a grid sheet resistor (1), a screen strip A (2), and a screen strip B (3). The width of the grid sheet resistor (1) is greater than 4 / 5 of the film width, and the widths of the screen strip A (2) and the screen strip B (3) are both less than 1 / 10 of the film width. The screen strip A (2) and the screen strip B (3) are blank, transparent, and unplated areas. The grid sheet resistor (1) is provided with a metal plating layer. The grid sheet resistor (1) includes several parallel grids. Adjacent grids are separated by blank grid edges C. The blank grid edges C are provided with grid safety devices. Adjacent grids are connected through grid safety devices. One end of the blank grid edges C is connected to the screen strip A (2), and the other end is connected to the screen strip B (3).
[0016] The angle between the blank mesh edge C and the screen strip B is between 80 and 90 degrees, preferably 89 degrees. The grid section sheet resistor (1) is located in the middle of the plastic film, the grid safety is located in the middle of the screen strip A and the screen strip B, the blank mesh edge C is formed by the unplated area on the surface of the plastic film, the screen strip A and the screen strip B are located on both sides of the grid section sheet resistor (1), and the width of the screen strip A and the screen strip B is the same.
[0017] Taking the explosion-proof metallized film with a film width of L1 = 35.0 ± 0.5 mm as an example, its screen band A width L2 = 1.0 ± 0.5 mm, screen band B width L3 = 1.0 ± 0.5 mm, mesh safety width L4 = 2.0 ± 0.5 mm, blank mesh edge C width L5 = 0.3 ± 0.1 mm, mesh width L6 = 17.0 ± 0.5 mm, and mesh height L7 = 33.0 ± 0.5 mm.
[0018] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.
Claims
1. An explosion-proof metallized film for a photovoltaic inverter capacitor, comprising a plastic film, a metal plating layer within the plastic film, the metallized film comprising a grid sheet resistor (1), a screen strip A (2), and a screen strip B (3), wherein the width of the grid sheet resistor (1) is greater than 4 / 5 of the film width, the widths of screen strip A and screen strip B are both less than 1 / 10 of the film width, and screen strip A and screen strip B are blank, transparent, unplated areas, and the grid sheet resistor (1) is provided with a metal plating layer, characterized in that: The grid section sheet resistor (1) includes several parallel grids, adjacent grids are separated by blank grid edges C, the blank grid edges C are provided with grid safety, adjacent grids are connected by grid safety, one end of the blank grid edge C is connected to the screen strip A (2), and the other end is connected to the screen strip B (3).
2. The explosion-proof metallization film for photovoltaic inverter capacitors according to claim 1, characterized in that: The grid section sheet resistance (1) is located in the middle of the plastic film, the grid safety is located in the middle of the screen strip A (2) and the screen strip B (3), the angle between the blank mesh edge C and the screen strip B (3) is between 80 degrees and 90 degrees, and the blank mesh edge C is composed of the unplated area on the surface of the plastic film.
3. The explosion-proof metallization film for photovoltaic inverter capacitors according to claim 1, characterized in that: The width of the screen strip A(2) is L2 = 1.0 ± 0.5 mm, the width of the screen strip B(3) is L3 = 1.0 ± 0.5 mm, and the grid height is L7 = 33.0 ± 0.5 mm.
4. The explosion-proof metallization film for photovoltaic inverter capacitors according to claim 3, characterized in that: The angle between the blank mesh edge C and the screen strip B(3) is 89 degrees.