A metallized high-voltage explosion-proof film capacitor

Abstract

This invention discloses a metallized high-voltage explosion-proof film capacitor. A first conductive region is provided between the first thickened area of ​​the first metallized film and the first blank edge. A first blank isolation strip is provided between the first thickened area and the first conductive region. The first conductive region is divided into a grid structure by the first blank dividing strip. A second conductive region is provided between the second thickened area of ​​the second metallized film and the second blank edge. A second blank isolation strip is provided between the second thickened area and the second conductive region. The second conductive region is divided into second unit areas by the second blank dividing strip. This allows the capacitor (450V AC rated voltage) of this invention to maintain its explosion-proof function even under conditions of 1.3 times the rated (585V AC) AC voltage superimposed with 10 times (4500V DC) rated DC voltage for 5 minutes. The non-internal series metallized high-voltage explosion-proof film capacitor of this invention has low material cost, is easy to manufacture, has a high product qualification rate, and offers good economic and social benefits.

Description

Technical Field

[0001] This invention specifically relates to the field of metallized film capacitors, and particularly to a metallized high-voltage explosion-proof film capacitor. Background Technology

[0002] Currently, polypropylene film explosion-proof capacitors (S3 grade) for 450V rated AC motors on the market are formed by winding one layer of metallized safety film and one layer of ordinary film, or two layers of metallized safety film. These capacitors have two structures: internal series and non-internal series. While a few internal series capacitors can pass the test of "continuously operating for 5 minutes under 1.3 times the rated (585V.AC) AC voltage superimposed with 10 times (4500V.DC) rated DC voltage without exploding," their manufacturing difficulty, material cost, and low yield rate prevent their widespread application due to the thinner film used. Non-internal series capacitors, compared to internal series capacitors, have the advantages of relatively lower cost and easier manufacturing; however, currently, non-internal series capacitors on the market cannot pass the above test conditions. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a metallized high-voltage explosion-proof film capacitor. It has good explosion-proof performance, relatively low manufacturing cost, is easy to manufacture, and can meet the requirement of S3 explosion-proof residual capacitance <1% in GB / T3667.1. At the same time, it can play an explosion-proof role for 5 minutes under the condition of 1.3 times the rated (585V.AC) AC voltage superimposed with 10 times (4500V.DC) rated DC voltage.

[0004] The metallized high-voltage explosion-proof film capacitor described in this invention comprises a shell, a capacitor element, and leads. The capacitor element is located inside the shell, and the leads are located at one end of the shell. The capacitor element is formed by stacking two layers of metallized film. One edge of the first metallized film has a first blank edge, and the corresponding other edge of the first metallized film has a first thickened plating area. A first conductive area is provided between the first thickened plating area and the first blank edge. A first insulating strip is provided between the first thickened plating area and the first conductive area. The first insulating strip has at least one first fuse for connecting the first thickened plating area and the first conductive area. The first conductive area is connected by a first... A blank dividing strip divides the first conductive area into a grid structure. Adjacent first unit areas are connected by at least one second fuse. A second blank edge is provided on one side of the second metallized film, and a second thickened plating area is provided on the corresponding other side of the second metallized film. A second conductive area is provided between the second thickened plating area and the second blank edge. A second blank isolation strip is provided between the second thickened plating area and the second conductive area. The second blank isolation strip is provided with at least one third fuse for connecting the second thickened plating area and the second conductive area. The second conductive area is divided by the second blank dividing strip to form a second unit area. Adjacent second unit areas are connected by at least one fourth fuse.

[0005] The first blank isolation strip is located near the edge of the first metallized film.

[0006] Preferably, the second conductive region is divided into a grid structure by a second blank dividing strip.

[0007] Preferably, the second conductive region is divided into a T-shaped structure by a second blank dividing strip.

[0008] Preferably, the thickness of the first metallized film and the second metallized film is set to 6.9 micrometers to 7.8 micrometers, the width of the first blank edge and the second blank edge is set to 1.5 millimeters to 3.2 millimeters, the width of the first blank isolation strip and the second blank isolation strip is set to 1.5 millimeters to 2 millimeters, the sheet resistance of the first conductive area and the second conductive area is set to 8 Ω / □ to 15 Ω / □, the width of the first fuse and the third fuse is set to 0.23 millimeters to 0.32 millimeters, and the sheet resistance of the first fuse and the third fuse is set to 4 Ω / □ to 7 Ω / □.

[0009] The beneficial effects of this invention are as follows: By setting a first conductive area between the first thickened plating area and the first blank edge, and a first blank isolation strip between the first thickened plating area and the first conductive area, and the first blank isolation strip having at least one first fuse for connecting the first thickened plating area and the first conductive area, the first conductive area is divided into a grid structure by the first blank dividing strip, and adjacent first unit areas of the first conductive area are connected by at least one second fuse; by setting a second conductive area between the second thickened plating area and the second blank edge, and a second blank isolation strip between the second thickened plating area and the second conductive area, and the second blank isolation strip having at least one third fuse for connecting the second thickened plating area and the second conductive area, the second conductive area is divided into second unit areas by the second blank dividing strip, and adjacent second unit areas are connected by at least one fourth fuse, the voltage resistance of the capacitor element of this invention is effectively improved, the S3 explosion-proof reliability of the capacitor of this invention is greatly improved, and the manufacturing cost of the capacitor of this invention is relatively low and easy to manufacture. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of the first metallization film of the present invention.

[0011] Figure 2 This is a schematic diagram of the structure of the second metallization film of the present invention.

[0012] Figure 3 yes Figure 1 Enlarged diagram of point A.

[0013] Figure 4 This is a cross-sectional schematic diagram of the first metallized film of the present invention.

[0014] Figure 5 This is a schematic diagram of the cross-sectional structure of the first metallized film and the second metallized film of the present invention.

[0015] Figure 6 This is a table showing comparative test data between the capacitor of the present invention and capacitors of the prior art.

[0016] Explanation of reference numerals: 100 - First metallized film; 2 - First thickened coating area; 3 - First fuse; 4 - First conductive area; 401 - First unit area; 5 - Second fuse; 6 - First blank isolation strip; 7 - First blank dividing strip; 8 - First blank edge; 200 - Second metallized film; 21 - Second thickened coating area; 31 - Third fuse; 41 - Second conductive area; 4101 - Second unit area; 51 - Fourth fuse; 61 - Second blank isolation strip; 71 - Second blank dividing strip; 81 - Second blank edge; 9 - Gold plating section. Detailed Implementation

[0017] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0018] The metallized high-voltage explosion-proof film capacitor of the present invention comprises a shell, a capacitor element and leads. The capacitor element is located inside the shell, and the leads are located at one end of the shell. The capacitor element is formed by stacking two metallized films. The metallized film is a thin film with a metal layer deposited on an insulating plastic film.

[0019] like Figure 1 As shown, one side edge of the first metallized film 100 is provided with a first blank edge 8, that is, there is no metal plating on the first blank edge 8. The corresponding other side edge of the first metallized film 100 is provided with a first plating thickening area 2. A first conductive area 4 is provided between the first plating thickening area 2 and the first blank edge 8, that is, the metal plating thickness of the first plating thickening area 2 is greater than the metal plating thickness of the first conductive area 4. A first blank isolation strip 6 is provided between the first plating thickening area 2 and the first conductive area 4. The first blank isolation strip 6 is provided with at least one first fuse 3 for connecting the first plating thickening area 2 and the first conductive area 4. The first conductive area 4 is divided into a grid structure by the first blank dividing strip 7. The adjacent first unit area 401 of the first conductive area 4 is connected by at least one second fuse 5. Specifically, the first unit area 401 is the grid area formed by dividing the first conductive area 4 by the first blank dividing strip 7.

[0020] like Figure 2 As shown, a second blank edge 81 is provided on one side edge of the second metallized film 200, and a second plating thickening area 21 is provided on the corresponding other side edge of the second metallized film 200. A second conductive area 41 is provided between the second plating thickening area 21 and the second blank edge 81. A second blank isolation strip 61 is provided between the second plating thickening area 21 and the second conductive area 41. The second blank isolation strip 61 is provided with at least one third fuse 31 for connecting the second plating thickening area 21 and the second conductive area 41. The second conductive area 41 is divided into second unit areas 4101 by the second blank dividing strip 71. Adjacent second unit areas 4101 are connected by at least one fourth fuse 51.

[0021] The first metallization film 100 and the second metallization film 200 are stacked together to form the above-mentioned capacitor element.

[0022] By setting the second fuse 5 and the fourth fuse 51, when a breakdown occurs in a localized area of ​​the stacked second conductive area 41 or the first conductive area 4, the second fuse 5 or the fourth fuse 51 corresponding to the breakdown area can quickly melt, causing the broken first unit area 401 or the second unit area 4101 to disconnect from the corresponding unbroken first unit area 401 or the second unit area 4101, preventing the self-healing range from continuously expanding, thereby avoiding the capacitor from exploding. When the first fuse 3 melts due to overload, since the first blank isolation strip 6 is located near the edge of the first metallized film 100, it can block the breakdown area from spreading to the first conductive area 4, preventing the material of the first conductive area 4 from evaporating in large quantities and causing the capacitor to explode. The third fuse 31 has the same function as the first fuse 3. Figure 5 As shown, the gold-plated part 9 is connected to the first plating thickened area 2 and the second plating thickened area 21 respectively. The first plating thickened area 2 corresponds to the position of the second blank edge 81. By setting the first plating thickened area 2 and the second plating thickened area 21, the connection conductivity between the capacitor element and the gold-plated part 9 is ensured.

[0023] In some embodiments, the second conductive region 41 is divided into a grid structure by the second blank dividing strip 71. That is, the second conductive region 41 of the second metallization film 200 can also be configured to have the same structure as the first conductive region 4, which helps to prevent the self-healing range from continuously expanding.

[0024] like Figure 2 As shown, in some embodiments, the second conductive region 41 is divided into a T-shaped structure by a second blank dividing strip 71. This T-shaped structure of the second conductive region 41 is existing technology. Specifically, the second blank dividing strip 71 and the second blank edge 81 constitute a T-shaped blank region. The manufacturing cost of the second conductive region 41 with the T-shaped structure is low, and the capacitance of the capacitor can be easily guaranteed. Therefore, by combining the second conductive region 41 with the T-shaped structure with the first conductive region 4 with the mesh structure, it is beneficial to guarantee the capacitance of the capacitor and also to ensure the explosion-proof performance of the capacitor.

[0025] Furthermore, such as Figure 4 As shown, the thicknesses of the first metallized film 100 and the second metallized film 200 (i.e., Figure 4 The dimension "D" in the figure is set to 6.9 micrometers to 7.8 micrometers, such as Figure 1 As shown, the widths of the first blank margin 8 and the second blank margin 81 (i.e., Figure 1 The dimension "W1" in the image is set to 1.5 mm to 3.2 mm, such as... Figure 3 As shown, the widths of the first blank isolation strip 6 and the second blank isolation strip 61 (i.e., Figure 3The dimension "W2" in the figure is set to 1.5 mm to 2 mm, the sheet resistance of the first conductive region 4 and the second conductive region 41 is set to 8 Ω / □ to 15 Ω / □, and the width of the first fuse 3 and the third fuse 31 (i.e., Figure 3 The size "W3" in the figure is set to 0.23 mm to 0.32 mm, and the sheet resistance of the first fuse 3 and the third fuse 31 is set to 4 Ω / □ to 7 Ω / □. The capacitor of this invention was configured according to the above parameters, and an explosion-proof test was conducted. The test results are as follows: Figure 6 As shown in the table, the above experiments demonstrate that setting appropriate first blank isolation band 6, second blank isolation band 61, first blank dividing band 7, second blank dividing band 71, first blank edge 8, and second blank edge 81 effectively improves the voltage resistance of the capacitor elements and greatly enhances the reliability of the capacitor's S3 explosion-proof design. Even under conditions of 1.3 times the rated (585V.AC) AC voltage superimposed with 10 times (4500V.DC) rated DC voltage for 5 minutes, it still provides explosion protection. The metallized high-voltage explosion-proof film capacitor of this invention is a reliable and safe capacitor. Moreover, compared with existing internal series structure capacitor products, the non-internal series metallized high-voltage explosion-proof film capacitor of this invention has lower material costs, is easier to manufacture, has a higher product qualification rate, and offers better economic and social benefits.

Claims

1. A metallized high-voltage explosion-proof film capacitor, comprising a shell, a capacitor element, and leads, wherein the capacitor element is located inside the shell, the leads are located at one end of the shell, and the capacitor element is formed by stacking two metallized films. Its features are: The first metallized film (100) has a first blank edge (8) on one side edge, and a first plating thickening area (2) on the other side edge corresponding to the first metallized film (100). A first conductive area (4) is provided between the first plating thickening area (2) and the first blank edge (8). A first blank isolation strip (6) is provided between the first plating thickening area (2) and the first conductive area (4). The first blank isolation strip (6) is provided with at least one first fuse (3) for connecting the first plating thickening area (2) and the first conductive area (4). The first conductive area (4) is divided into a grid structure by the first blank dividing strip (7). The adjacent first unit area (401) of the first conductive area (4) is connected by at least one second fuse (5). The second metallized film (200) has a second blank edge (81) on one side edge, and a second plating thickening area (21) is provided on the other side edge of the second metallized film (200). A second conductive area (41) is provided between the second plating thickening area (21) and the second blank edge (81). A second blank isolation strip (61) is provided between the second plating thickening area (21) and the second conductive area (41). The second blank isolation strip (61) is provided with at least one third fuse (31) for connecting the second plating thickening area (21) and the second conductive area (41). The second conductive area (41) is divided by the second blank dividing strip (71) to form a second unit area (4101). Adjacent second unit areas (4101) are connected by at least one fourth fuse (51). The first blank isolation strip (6) is located at the edge near the first metallized film (100).

2. The metallized high-voltage explosion-proof film capacitor according to claim 1, characterized in that: The second conductive region (41) is divided into a grid structure by the second blank dividing strip (71).

3. The metallized high-voltage explosion-proof film capacitor according to claim 1, characterized in that: The second conductive region (41) is divided into a T-shaped structure by the second blank dividing band (71).

4. The metallized high-voltage explosion-proof film capacitor according to claim 1, characterized in that: The thickness of the first metallized film (100) and the second metallized film (200) is set to 6.9 micrometers to 7.8 micrometers, the width of the first blank edge (8) and the second blank edge (81) is set to 1.5 millimeters to 3.2 millimeters, the width of the first blank isolation strip (6) and the second blank isolation strip (61) is set to 1.5 millimeters to 2 millimeters, the sheet resistance of the first conductive area (4) and the second conductive area (41) is set to 8 Ω / □ to 15 Ω / □, the width of the first fuse (3) and the third fuse (31) is set to 0.23 millimeters to 0.32 millimeters, and the sheet resistance of the first fuse (3) and the third fuse (31) is set to 4 Ω / □ to 7 Ω / □.

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