CN114171320A - Capacitor element with internal string type edge thickening high sheet resistance safety film structure - Google Patents
Capacitor element with internal string type edge thickening high sheet resistance safety film structure Download PDFInfo
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- CN114171320A CN114171320A CN202111656688.5A CN202111656688A CN114171320A CN 114171320 A CN114171320 A CN 114171320A CN 202111656688 A CN202111656688 A CN 202111656688A CN 114171320 A CN114171320 A CN 114171320A
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- safety film
- thickened
- capacitor element
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- 239000003990 capacitor Substances 0.000 title claims abstract description 57
- 230000008719 thickening Effects 0.000 title description 3
- 238000009413 insulation Methods 0.000 claims abstract description 45
- 238000001883 metal evaporation Methods 0.000 claims abstract description 8
- 230000007704 transition Effects 0.000 claims description 12
- 238000004804 winding Methods 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 239000012528 membrane Substances 0.000 claims 1
- 239000011248 coating agent Substances 0.000 abstract 3
- 238000000576 coating method Methods 0.000 abstract 3
- 239000010408 film Substances 0.000 description 64
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 5
- 239000010931 gold Substances 0.000 description 5
- 229910052737 gold Inorganic materials 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 238000001465 metallisation Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910000611 Zinc aluminium Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- HXFVOUUOTHJFPX-UHFFFAOYSA-N alumane;zinc Chemical compound [AlH3].[Zn] HXFVOUUOTHJFPX-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011104 metalized film Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/32—Wound capacitors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G2/00—Details of capacitors not covered by a single one of groups H01G4/00-H01G11/00
- H01G2/14—Protection against electric or thermal overload
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/33—Thin- or thick-film capacitors
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
The invention belongs to the technical field of capacitor element design, and particularly relates to a capacitor element with an internal string type edge-thickened high sheet resistance safety film structure. The anti-counterfeiting film comprises a first safety film and a second safety film, wherein the first safety film and the second safety film are wound to form an element, and the first safety film is positioned on the outer side of the second safety film. First rupture disk and second rupture disk all include base film and metal evaporation coating, and metal evaporation coating covers on the surface of base film, is provided with a plurality of first insulation clearance and a plurality of second insulation clearance on the metal evaporation coating, and a plurality of first insulation clearance intervals set up, are provided with the emergency exit between the adjacent first insulation clearance. According to the invention, under the condition of self-healing failure of the capacitor, the safety door is disconnected, so that the connection between the cell block corresponding to the self-healing failure and the intact cell blocks in the surrounding live-line operation can be effectively isolated, the further expansion of the fault is prevented, the capacitor is ensured to operate more safely and reliably, and the loss of capacity can be reduced by the design of the cell blocks.
Description
Technical Field
The invention belongs to the technical field of capacitor element design, and particularly relates to a capacitor element with an internal string type edge-thickened high sheet resistance safety film structure.
Background
Along with the development of domestic economy, the demand of extra-high voltage flexible direct current and new energy transmission for a direct current support capacitor is larger and larger, and the direct current support capacitor is one of core group components of the flexible direct current transmission multilevel converter. However, the direct current supporting capacitors of the flexible direct current transmission project built in China up to now all adopt imported capacitor equipment, and products in the market of the direct current supporting capacitors in China and abroad are in monopoly.
Although the traditional capacitor technology with a single-string structure and a high sheet resistance film and the existing safety film structure can continue to operate when the self-healing is successful, the direct current capacitor designed and manufactured by the traditional metallized film structure in China at present cannot meet the requirements of related technologies such as safety, reliability, small size and the like of a direct current support capacitor, and the problems of reliability and safety such as bulging, serious explosion and the like in the operation of the capacitor are not effectively solved.
Disclosure of Invention
The invention provides a capacitor element with an inner-string type edge-thickened high-sheet-resistance safety film structure, which solves the problems of reliability and safety in capacitor operation in the prior art.
The invention provides a capacitor element with an inner string type edge-thickened high sheet resistance safety film structure, which adopts the following technical scheme: the utility model provides an interior string formula edge thickening high square resistance rupture disk structure capacitor element, includes first rupture disk and second rupture disk, first rupture disk and the mutual coiling of second rupture disk make the component, just first rupture disk is convoluteed and is set up the outside of second rupture disk.
The first and second safety films each include a base film and a metal deposition layer covering a surface of the base film, the metal deposition layer being divided into a plurality of unit blocks by a plurality of second insulation gaps.
The unit blocks on the first security film are distributed on two edge regions of the first security film along a first direction, the unit blocks on the second security film are distributed on a middle region of the second security film, and the first direction is a direction perpendicular to a winding direction.
A plurality of first insulation gaps are formed at intervals on one side, away from the edge area, of each unit block on the first safety film, and a safety door is formed between every two adjacent first insulation gaps.
One side of each unit block on the second safety film, which is far away from the middle area, forms a plurality of second insulation gaps which are arranged at intervals, a safety door is formed between every two adjacent second insulation gaps, and an inner string insulation gap is formed between every two adjacent unit blocks along the first direction.
Further, in the first security film, the shape of the film side of the base film is wavy.
Furthermore, a thickened area is arranged on one side, away from the unit block, of the first insulation gap, the metal thickness of the thickened area is larger than that of the unit block, and a transition area is arranged between the thickened area and the unit block.
Further, the transition region is a ramp-shaped transition.
Furthermore, the sheet resistance value range of the unit blocks of the first safety film and the second safety film is 25-65 omega/port.
Further, the element is in the shape of a flat cylinder or a cylinder.
Further, the device also comprises a gold spraying layer, and the gold spraying layer is arranged on the top surface of the element.
Further, the security gate includes a fuse.
The invention has the beneficial effects that: according to the invention, under the condition of self-healing failure of the capacitor, the safety door is disconnected, so that the connection between the cell block corresponding to the self-healing failure and the intact cell blocks in the surrounding live-line operation can be effectively isolated, the further expansion of the fault is prevented, the capacitor is ensured to operate more safely and reliably, and the loss of capacity can be reduced by the design of the cell blocks. Meanwhile, the inner string of the capacitor element is formed through the inner string isolation gap, so that the nominal voltage of the element can be improved, the equivalent series resistance and the equivalent series inductance are reduced, and the heating is reduced.
Drawings
Fig. 1 is a structural view of a first embodiment of the present invention.
Fig. 2 is a structural view of a second embodiment of the present invention.
FIG. 3 is a top view of a first rupture disk in an embodiment of the present invention.
FIG. 4 is a top view of a second rupture disk in an embodiment of the present invention.
FIG. 5 is a side view of a first rupture disk in an embodiment of the present invention.
FIG. 6 is a side view of a second rupture disk in an embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic structural diagram provided by a capacitor element with an internal string type edge-thickened high sheet resistance rupture disk structure, according to an embodiment of the present invention. As shown in fig. 1, the present embodiment includes a first security film 4 and a second security film 3, the first security film 4 and the second security film 3 are wound around each other to form a component, and the first security film 4 is wound around the outside of the second security film 3. The element further comprises an outer wrapper 5 and a sprayed gold layer 2, the outer wrapper 5 being wound around the outside of the first security film 4, together with the first security film 4 and the second security film 3, in the outermost layer of the element. The gold-sprayed layer 2 is arranged on the top surface of the element.
In this embodiment, the element is in the shape of a flat cylinder. And during winding, the first safety film 4, the second safety film 3 and the outer wrapping film 5 are wound around the mandrel, and the mandrel is pulled away after winding is finished and is pressed to form a flat cylinder. The upper end face of the element can be fully sprayed with gold or the semicircular parts on two sides are not sprayed with gold, so that the element is suitable for a gas or dry capacitor, the assembly is convenient, the space ratio of the capacitor of the element is greatly improved, and the volume of the capacitor is reduced.
As another embodiment of the present invention, as shown in fig. 2, the difference from the above embodiment is that in this embodiment, the element is shaped like a cylinder and the center is a mandrel 7. The cylindrical element can be wound into elements with different sizes to be assembled in a mixed mode, assembly is convenient, the space occupation ratio of the capacitor of the element can be improved, and the volume of the capacitor is reduced.
In one embodiment of the present invention, as shown in fig. 3 and 4, the first and second security films 4 and 3 each include a base film 23 and a metal deposition layer covering a surface of the base film, the metal deposition layer being divided into a plurality of unit blocks 12 by a plurality of second insulation gaps 13,
the unit blocks 12 on the first security film 4 are distributed at both edge regions of the first security film in a first direction, which is a direction perpendicular to the winding direction, and the unit blocks 12 on the second security film 3 are distributed at a middle region of the second security film 3;
a plurality of first insulation gaps 10 are formed at intervals on one side of each unit block 12, which is far away from the edge area, of the first safety film 4, and a safety door 11 is formed between every two adjacent first insulation gaps 10;
one side of each unit block 12 on the second security film 3, which is far away from the middle area, forms a plurality of second insulation gaps which are arranged at intervals, a safety door 11 is formed between every two adjacent second insulation gaps, and an inner string insulation gap 14 is formed between the unit blocks 12 which are adjacent along the first direction.
The first insulation gaps 10 are arranged in parallel with the film edge of the first safety film 4, the first insulation gaps 10 are arranged at intervals, and safety doors 11 are arranged between the adjacent first insulation gaps 10. Wherein, first rupture disk 4 and second rupture disk 3 all are provided with two sets of a plurality of first insulation clearance 10, and two sets of a plurality of first insulation clearance 10 are parallel and the interval sets up.
In the first security film 4, one end of each of the second insulating gaps 13 is connected to the film edge of the first security film 4, and the other end of each of the second insulating gaps 13 is connected to the first insulating gap 10, and the area formed by the first insulating gap 10, the second insulating gap 13 and the film edge of the first security film 4 is a unit block 12. Wherein, because two sets of a plurality of first insulation gaps 10 are provided, taking the direction of the drawing of fig. 3 as an example, the left and right parts of the first safety film are both in a unit block 12 structure, and the left and right parts of the first safety film are both provided with film side gaps 22.
In the second security film 3, an inner string insulation gap 14 is arranged on the metal evaporation layer, the inner string insulation gap 14 is parallel to the film edge of the second security film 3, the second security film 3 is divided into two parts, each part contains a plurality of unit blocks 12, and the inner string insulation gap 14 is located between two groups of the plurality of first insulation gaps 10. One end of each of the second insulation gaps 13 of the second rupture disk 3 is connected to the inner string insulation gap 14, the other end of each of the second insulation gaps is connected to the first insulation gap 10, and the area formed by the first insulation gap 10, the second insulation gap 13 and the inner string insulation gap 14 is a cell block 12. Due to the division of the inter-string insulation gap, both parts are in a unit block 12 structure.
It should be noted that it is not necessary that each first insulation gap 10 is connected to one second insulation gap 13, and the number of safety doors may be determined by setting a reasonable size of the cell blocks 12 according to needs, which is not limited herein. Due to the structural design, the proportion of the capacity formed by each unit block 12 in the capacity of a single element is extremely small, so even if the insulation damage between certain unit blocks 12 needs to be isolated, the capacity loss caused by the insulation damage accounts for very little change of the capacity of the whole capacitor, and the performance requirement on the capacitor in normal operation is not influenced.
Each unit block 12 small capacitor is protected by a safety door, when the unit block small capacitor metalized pole plate fails in self-healing, the safety door is disconnected, the unit block 12 small capacitor which fails is protected and isolated, and the safe and reliable operation of the whole capacitor is ensured. Even if the capacity of the whole capacitor is lost to more than 90%, the capacitor is not seriously bulged and exploded.
The metal evaporation layer is divided into a plurality of unit blocks 12 with the same size, each unit block 12 is connected with other unit blocks 12 in parallel through a safety door, and after two safety films are overlapped, each unit block 12 and the unit block 12 at the corresponding position are insulated through a base film layer and form a small capacitor.
The second safety film is of a two-string structure, the nominal voltage of the element can be designed to be higher, and the capacitor adopting the inner-string element design is smaller than the capacitor adopting a single-string element design in terms of equivalent series inductance and equivalent series resistance, so that the heating of the capacitor is smaller, and the heating can cause more serious influence on the service life and the operation safety of the capacitor.
In one embodiment of the present invention, in the first security film 4, the edge shape of the base film is a wave shape. The wavy film edge is beneficial to improving the strength of metal spraying, reducing loss and having better large current impact resistance.
In one embodiment of the invention, a side of the first insulating gap 10 facing away from the cell block 12 is provided with a thickened region 19, the thickened region 19 has a metal thickness greater than that of the cell block 12, and a transition region 20 is provided between the thickened region 19 and the cell block 12. A transition region 20 is disposed between the thickened region 19 and the unit block 12, and fig. 5 and 6 can be referred to specifically. The transition regions 20 are all ramp shaped transitions.
The edge of the second safety film 3 is designed by adopting the thickened area 19, so that the sheet resistance can be reduced, the overcurrent bearing capacity is high, and the large inrush current impact can be resisted. The unit block 12 is designed to have a high sheet resistance, and the specific range can be 25-65 Ω/opening, and the material is zinc-aluminum alloy. The ramp-shaped transition design is adopted, so that the transition change of the capacitor element current from large to small under the ripple waves can be adapted.
When a certain local point of the safety film is broken down, the energy on the cell block 12 where the breaking point is located and the energy on the peripheral cell block 12 flow to the breaking point, so that the energy passes through the safety door. If the breakdown point is normally self-healing, the self-healing energy consumed by the breakdown point is very small, the current flowing through the safety door is very small, and the generated energy cannot cause the safety door to be disconnected. If the self-healing of the breakdown point fails, the short-circuit resistance of the fault point is relatively low, so that the current and energy flowing through the safety door are obviously increased, and the safety door of the unit block 12 corresponding to the fault point is disconnected by the large energy. Therefore, the fault part can be isolated and prevented from further expanding, and the capacitor is protected safely.
According to the size of a capacitor box shell and related technical performance requirements, a plurality of proper cylindrical elements are selected to be cylindrical large elements or a plurality of cylindrical large elements matched with a plurality of cylindrical small elements or a plurality of flat cylindrical elements to form a capacitor core, and the capacitor is manufactured through the processes of welding, electrical connection, assembly, glue injection and the like. The principle and the technical problem to be solved of the present invention are the same as those of the capacitor element with the inner-string type edge-thickened high-sheet-resistance safety film structure, and therefore, the details are not repeated herein.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (8)
1. An inner-string capacitor element with an edge-thickened high-sheet-resistance safety film structure is characterized by comprising a first safety film (4) and a second safety film (3), wherein the first safety film (4) and the second safety film (3) are mutually wound to form an element, and the first safety film (4) is wound and arranged on the outer side of the second safety film (3);
the first safety film (4) and the second safety film (3) respectively comprise a base film (23) and a metal evaporation layer, the metal evaporation layer covers the surface of the base film (23), and the metal evaporation layer is divided into a plurality of unit blocks (12) by a plurality of second insulation gaps (13);
the unit blocks (12) on the first security film (4) are distributed on two edge regions of the first security film along a first direction, the unit blocks (12) on the second security film (3) are distributed on a middle region of the second security film (3), and the first direction is a direction perpendicular to the winding direction;
one side of each unit block (12) on the first safety film (4) departing from the edge area forms a plurality of first insulation gaps (10) arranged at intervals, and a safety door (11) is formed between every two adjacent first insulation gaps (10);
one side of each unit block (12) on the second safety film (3) departing from the middle area forms a plurality of second insulation gaps which are arranged at intervals, a safety door (11) is formed between every two adjacent second insulation gaps, and an inner string insulation gap (14) is formed between the unit blocks (12) adjacent along the first direction.
2. The inline edge-thickened high sheet resistance rupture disk structural capacitor element of claim 1, wherein in the first rupture disk (4) the edge of the base membrane (23) is wave-shaped.
3. The inline, edge-thickened, high sheet resistance rupture disk capacitor element of claim 1, wherein a side of the first insulating gap (10) facing away from the cell block (12) is provided with a thickened region (19), the thickened region (19) having a metal thickness greater than the cell block (12), and a transition region (20) is provided between the thickened region (19) and the cell block (12).
4. The inline, edge-thickened, high sheet resistance rupture disk capacitor element of claim 3, wherein said transition region (20) is a ramp-shaped transition.
5. The capacitor element with an internally-strung edge-thickened high sheet resistance rupture disk structure according to claim 1, wherein the sheet resistance values of the unit blocks (12) of the first rupture disk (4) and the second rupture disk (3) are in the range of 25-65 Ω/port.
6. The inline, thickened high sheet resistance rupture disk capacitor element of claim 1, wherein said element is in the shape of a flat cylinder or a cylinder.
7. The capacitor element with an internal string type edge-thickened high sheet resistance safety film structure as claimed in claim 1, further comprising a metal-sprayed layer (2), wherein the metal-sprayed layer (2) is disposed on the top surface of the element.
8. The inline, edge-thickened, high sheet resistance capacitor element of claim 1, wherein the security gate (11) comprises a fuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111656688.5A CN114171320A (en) | 2021-12-30 | 2021-12-30 | Capacitor element with internal string type edge thickening high sheet resistance safety film structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111656688.5A CN114171320A (en) | 2021-12-30 | 2021-12-30 | Capacitor element with internal string type edge thickening high sheet resistance safety film structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114171320A true CN114171320A (en) | 2022-03-11 |
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ID=80488717
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111656688.5A Pending CN114171320A (en) | 2021-12-30 | 2021-12-30 | Capacitor element with internal string type edge thickening high sheet resistance safety film structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114171320A (en) |
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2021
- 2021-12-30 CN CN202111656688.5A patent/CN114171320A/en active Pending
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