阅读说明：本技术 一种金属化安全膜设计方法及装置 (Metallized safety film design method and device ) 是由 劳斯佳 严飞 尹婷 何慧雯 于 2020-12-09 设计创作，主要内容包括：本发明公开了一种金属化安全膜设计方法,包括：获得金属化安全膜在不同电流门宽度下对应的电流能量；在所述不同电流门宽度中,选择正常连续多次自愈时的电流能量未使电流门达到熔点,且留有预先设定的裕度的电流门宽度,作为金属化安全膜的电流门宽度；获得金属化安全膜在不同电流门宽度下,电流门熔断后,在绝缘间隙上产生的电位差；在所述电位差中,选择能承受2倍电压峰值的电位差不发生沿面闪络的绝缘尺寸作为金属化安全膜的电流门长度,从而完成金属化安全膜的设计。解决现有安全膜电流门的设计方法不成熟的问题。(The invention discloses a method for designing a metallized safety film, which comprises the following steps: obtaining corresponding current energy of the metallized safety film under different current door widths; selecting the current door width which does not enable the current door to reach a melting point and leaves a preset margin among the different current door widths when the current door is normally, continuously and self-healed for multiple times as the current door width of the metalized safety film; obtaining the potential difference generated on the insulation gap after the current gate is fused under different current gate widths of the metallized safety film; and selecting an insulating size which can bear 2 times of voltage peak value and can not generate surface flashover as the current gate length of the metallized safety film, thereby completing the design of the metallized safety film. The problem that the design method of the existing safety film current door is immature is solved.)

1. A metallized rupture disk design method, comprising:

obtaining corresponding current energy of the metallized safety film under different current door widths;

selecting the current door width which does not enable the current door to reach a melting point and leaves a preset margin among the different current door widths when the current door is normally, continuously and self-healed for multiple times as the current door width of the metalized safety film;

obtaining the potential difference generated on the insulation gap after the metalized safety film is fused on the current gate;

and selecting an insulating size which can bear 2 times of voltage peak value and can not generate surface flashover as the current gate length of the metallized safety film, thereby completing the design of the metallized safety film.

2. The method of claim 1, wherein obtaining corresponding current energies for the metallized rupture disk at different current gate widths comprises:

and calculating corresponding current energy under different current door widths according to the current waveform of the metallized safety film during self-healing.

3. The method of claim 1, wherein selecting a current gate width that does not cause the current gate to reach a melting point and leaves a predetermined margin when the current energy is used for a normal plurality of consecutive self-healing operations comprises:

the current energy when normal continuous self-healing for 3 times is selected to ensure that the current gate does not reach the melting point and the width of the current gate with the preset margin of 30 percent is reserved.

4. A metallized rupture disk design apparatus, comprising:

the current energy obtaining unit is used for obtaining corresponding current energy of the metallized safety film under different current door widths;

the current gate width determining unit is used for selecting the current gate width which does not enable the current gate to reach a melting point and leaves a preset margin among the different current gate widths when the current gate is normally, continuously and self-healed for multiple times as the current gate width of the metalized safety film;

the potential difference acquisition unit is used for acquiring the potential difference generated on the insulation gap after the current gate is fused under different current gate widths of the metalized safety film;

and a current gate length determining unit which selects an insulation size capable of bearing a voltage peak value of 2 times without surface flashover among the potential differences as the current gate length of the metallized safety film, thereby completing the design of the metallized safety film.

5. The apparatus of claim 4, wherein the current energy harvesting unit comprises:

and the current energy determining subunit calculates the corresponding current energy under different current door widths according to the current waveform when the self-healing of the metallized safety film occurs.

6. The apparatus of claim 4, wherein the current gate width determining unit comprises:

and determining the width of the current gate of the stator unit, selecting the current energy when the current gate is normally and continuously self-healed for 3 times, wherein the current energy does not enable the current gate to reach a melting point, and the width of the current gate is reserved with a preset margin of 30%.

Technical Field

The application relates to the field of design and manufacture of metallized film self-healing capacitors, in particular to a metallized safety film design method and a metallized safety film design device.

Background

Even if the capacitance of the metallized film capacitor adopting the safety film structure is completely lost, the capacitor can not be obviously bulged or exploded, the occurrence of short circuit fault inside the capacitor can be effectively prevented, and the stability of the capacitor is improved. The safety film adopts a split electrode design, the whole metal electrode is split into a plurality of small blocks, the blocks are isolated by demetallized insulating tapes, and different blocks are connected through current gates. At present, no mature theoretical method exists for designing a current door of a safety film, so that researches on designing methods for the width and the length of the current door of the safety film are provided, and design basis is provided for product designers.

Disclosure of Invention

The application provides a method and a device for designing a metallized safety film, which solve the problem that the design method of the current door of the conventional safety film is immature.

The application provides a metallized safety film design method, which comprises the following steps:

obtaining corresponding current energy of the metallized safety film under different current door widths;

selecting the current door width which does not enable the current door to reach a melting point and leaves a preset margin among the different current door widths when the current door is normally, continuously and self-healed for multiple times as the current door width of the metalized safety film;

obtaining the potential difference generated on the insulation gap after the metalized safety film is fused on the current gate;

and selecting an insulating size which can bear 2 times of voltage peak value and can not generate surface flashover as the current gate length of the metallized safety film, thereby completing the design of the metallized safety film.

Preferably, the obtaining of the corresponding current energy of the metallized safety film under different current door widths comprises:

and calculating corresponding current energy under different current door widths according to the current waveform of the metallized safety film during self-healing.

Preferably, the selecting the current energy when the current gate is normally and continuously self-healed for multiple times without the current gate reaching the melting point and with the current gate width having a preset margin includes:

the current energy when normal continuous self-healing for 3 times is selected to ensure that the current gate does not reach the melting point and the width of the current gate with the preset margin of 30 percent is reserved.

This application provides a metallized safety film design device simultaneously, includes:

the current energy obtaining unit is used for obtaining corresponding current energy of the metallized safety film under different current door widths;

the current gate width determining unit is used for selecting the current gate width which does not enable the current gate to reach a melting point and leaves a preset margin among the different current gate widths when the current gate is normally, continuously and self-healed for multiple times as the current gate width of the metalized safety film;

the potential difference acquisition unit is used for acquiring the potential difference generated on the insulation gap after the current gate is fused under different current gate widths of the metalized safety film;

and a current gate length determining unit which selects an insulation size capable of bearing a voltage peak value of 2 times without surface flashover among the potential differences as the current gate length of the metallized safety film, thereby completing the design of the metallized safety film.

Preferably, the current energy obtaining unit includes:

and the current energy determining subunit calculates the corresponding current energy under different current door widths according to the current waveform when the self-healing of the metallized safety film occurs.

Preferably, the current gate width determining unit includes:

and determining the width of the current gate of the stator unit, selecting the current energy when the current gate is normally and continuously self-healed for 3 times, wherein the current energy does not enable the current gate to reach a melting point, and the width of the current gate is reserved with a preset margin of 30%.

The application provides a metallized safety film design method and a metallized safety film design device, wherein in different current door widths, the current door width is determined by selecting the current energy when normal continuous multiple self-healing does not enable the current door to reach a melting point and reserving a preset margin, and the current door width is used as the current door width of the metallized safety film, and the current door width of the metallized safety film is determined according to the potential difference generated on an insulation gap after the current door is melted, so that the immature problem of the existing safety film current door design method is solved.

Drawings

FIG. 1 is a schematic flow chart of a method for designing a metallized rupture disk according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram illustrating a current gate fusing at different current energies according to an embodiment of the present application;

fig. 3 is a schematic diagram of a metallized rupture disk design apparatus according to an embodiment of the present application.

Detailed Description

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of implementation in many different ways than those herein set forth and of similar import by those skilled in the art without departing from the spirit of this application and is therefore not limited to the specific implementations disclosed below.

Fig. 1 is a schematic flow chart of a method for designing a metallized security film according to an embodiment of the present disclosure, and the method according to the embodiment of the present disclosure is described in detail with reference to fig. 1.

Step S101 obtains the corresponding current energy of the metallized security film under different current gate widths.

According to the current gate width size design provided by the application, firstly, the current waveform when the metalized film is self-healed is obtained according to design experience or experimental measurement, and the corresponding current energy ^ i corresponding to different current gate widths is calculated according to the formula listed in table 1²dt。

TABLE 1 Current energy ^ i required for the current gate to reach different states²dt

And S102, selecting the current door width which does not enable the current door to reach a melting point and leaves a preset margin among the different current door widths when the current door is normally, continuously and self-healed for multiple times as the current door width of the metalized safety film.

Selecting a proper current gate width from different current gate widths, specifically selecting current energy when normal continuous self-healing is performed for 3 times, wherein the current gate does not reach a melting point, and the current gate width is reserved with a preset margin of 30%. Because the energy during self-healing failure is far greater than normal self-healing, the current gate can reliably act as long as the energy during 3 continuous normal self-healing exceeds the current gate to 50% of the melting point energy, and the self-healing failure occurs.

And step S103, acquiring the potential difference generated on the insulation gap after the metalized safety film current door is fused.

When designing the length of the current gate, it is mainly considered that a potential difference is generated on the insulation gap after the current gate is fused.

And step S1040, selecting an insulation size which can bear 2 times of voltage peak value of the potential difference and does not generate surface flashover as the length of the current gate of the metalized safety film, thereby completing the design of the metalized safety film.

When the arc current of the current gate is extinguished in a zero-crossing mode, the residual voltage on the cut safety film unit is usually the peak value of voltage, and the potential difference of 2 times the peak value of the voltage at the maximum can be generated on the insulation gap, so that the insulation gap is required not to generate surface flashover at the moment.

The best embodiment of the specific application of the application is as follows:

taking a practical design of a current gate as an example, the current gate is subjected to a current capacity test in an environment of 60 ℃. A current gate with a width B of 1.5mm was selected as a sample, the number N was 1, the sheet resistance was 2. omega./□, and the parallel capacitance was 40. mu.F. During the test, the voltage is changed within the range of 950V-1200V to obtain different ^ jj 2dt, the fusing condition of the current gate under different ^ jj 2dt is observed, and the test result is shown in fig. 2.

As can be seen from FIG. 2, when ^ i²dt to 3.528X 10^-5When the current gate has a slight evaporation point, and when ^ i²dt exceeding 6.241X 10^-5Then, the current gate has obvious evaporation point and even completely evaporates,more than 7.500X 10^-5After that, the current gate is totally evaporated. The test result shows that the fusing state of the 1.5mm wide current gate is 3.295 multiplied by 10^-5And 6.241X 10^-5The two energies have relatively obvious changes, the fusing effect of the current gate has certain dispersity, and therefore certain margin is reserved when the current gate is designed to ensure the reliability of the action.

Based on the same inventive concept, the present application also provides a metallized rupture disk design apparatus 300, as shown in fig. 3, comprising:

the current energy obtaining unit 3104 is used for obtaining corresponding current energy of the metallized safety film under different current door widths;

a current gate width determining unit 320, which selects, as the current gate width of the metalized safety film, a current gate width which does not allow the current gate to reach a melting point due to current energy when 3 self-healing normally and continuously occur, and leaves a preset 30% margin, among the different current gate widths;

the potential difference obtaining unit 330 is used for obtaining the potential difference generated on the insulation gap after the current gate is fused under different current gate widths of the metalized safety film;

and a current gate length determination unit 340 for selecting, as the current gate length of the metallized rupture disk, an insulating size that can withstand a voltage peak of 2 times without a flashover along the surface among the potential differences, thereby completing the design of the metallized rupture disk.

Preferably, the current energy obtaining unit includes:

and the current energy determining subunit calculates the corresponding current energy under different current door widths according to the current waveform when the self-healing of the metallized safety film occurs.

Preferably, the current gate width determining unit includes:

and determining the width of the current gate of the stator unit, selecting the current energy when the current gate is normally and continuously self-healed for 3 times, wherein the current energy does not enable the current gate to reach a melting point, and the width of the current gate is reserved with a preset margin of 30%.

The invention provides a method and a device for designing a metalized safety film, which fill the blank that the design of a safety film current gate does not have a mature theoretical method.

Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention.