CN114400143A - Multilayer ceramic capacitor - Google Patents
Multilayer ceramic capacitor Download PDFInfo
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- CN114400143A CN114400143A CN202210110940.0A CN202210110940A CN114400143A CN 114400143 A CN114400143 A CN 114400143A CN 202210110940 A CN202210110940 A CN 202210110940A CN 114400143 A CN114400143 A CN 114400143A
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- 239000003985 ceramic capacitor Substances 0.000 title claims abstract description 44
- 239000000919 ceramic Substances 0.000 claims abstract description 74
- 230000007704 transition Effects 0.000 claims description 15
- 230000005684 electric field Effects 0.000 abstract description 11
- 239000003990 capacitor Substances 0.000 abstract description 3
- 230000015556 catabolic process Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002003 electrode paste Substances 0.000 description 1
- 239000011267 electrode slurry Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
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- 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
- H01G2/20—Arrangements for preventing discharge from edges of electrodes
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- 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
- H01G4/002—Details
- H01G4/005—Electrodes
-
- 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
- H01G4/30—Stacked capacitors
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Ceramic Capacitors (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
The invention relates to the technical field of capacitors, and discloses a multilayer ceramic capacitor which comprises a ceramic body and end electrodes arranged on two end faces of the ceramic body, wherein the end electrodes extend to the upper surface and the lower surface of the ceramic body, the tail ends of the two end electrodes are oppositely arranged, a distance is reserved between the tail ends of the two end electrodes, and one side, facing the ceramic body, of the tail ends of the end electrodes is arranged to be in an arc shape. According to the multilayer ceramic capacitor, the side, facing the ceramic body, of the tail end of the terminal electrode is arc-shaped, and the surface, facing the inside of the ceramic body, of the tail end of the terminal electrode is a curved surface, so that the concentration degree of an electric field is reduced, the voltage resistance of the multilayer ceramic capacitor is improved, and the risk of breakdown and burning is reduced.
Description
Technical Field
The invention relates to the technical field of capacitors, in particular to a multilayer ceramic capacitor.
Background
Referring to fig. 1, which is a cross-sectional view of a multilayer ceramic capacitor of the prior art, terminal electrodes 2 'are provided on two end faces 15' of a ceramic body, and the terminal electrode 2 'further extends to the upper and lower surfaces of the ceramic body, the end of the terminal electrode 2' extending to the upper and lower surfaces of the ceramic body is denoted as the end of the terminal electrode 2 ', the ceramic body includes a plurality of dielectric layers 11' stacked in the thickness direction of the ceramic body and an internal electrode 12 'disposed between two adjacent dielectric layers 11', the internal electrode 12 'includes a first internal electrode 121' and a second internal electrode 122 'respectively connected to the two terminal electrodes 2', the other end of the first internal electrode 121 ' and the other end of the second internal electrode 122 ' are respectively referred to as the end of the first internal electrode 121 ' and the end of the second internal electrode 122 ', which are respectively spaced from the end surface 15 ' of the ceramic body to which the first internal electrode 121 ' and the second internal electrode 122 ' are directed, and are alternately disposed.
In the prior art, the terminal electrode is formed by impregnating a ceramic body with an electrode paste. The terminal electrodes extend to the tail ends of the upper surface and the lower surface of the ceramic body respectively, a sharp-angled shape is formed at the tail ends due to the fact that electrode slurry is influenced by gravity, and the sharp-angled shape is inclined to correspond to the tail ends of the first inner electrode or the second inner electrode towards the direction of the inner electrode, so that the concentration degree of an electric field at the tail ends is increased, and the multilayer ceramic capacitor is in danger of being broken down and burnt.
Disclosure of Invention
The purpose of the invention is: provided is a multilayer ceramic capacitor which can improve the problem of electric field concentration and reduce the risk of breakdown and burning.
In order to achieve the above object, the present invention provides a multilayer ceramic capacitor, including a ceramic body and terminal electrodes disposed on two end faces of the ceramic body, wherein the terminal electrodes extend to an upper surface and a lower surface of the ceramic body, ends of the two terminal electrodes are disposed opposite to each other with a distance therebetween, and one side of the ends of the terminal electrodes facing the ceramic body is set to be arc-shaped.
Preferably, the portion of the end of the terminal electrode that is configured in a circular arc shape is referred to as a transition portion, and the transition portion extends to a side of the end of the terminal electrode that faces away from the ceramic body.
Preferably, the angle α at which the transition portion intersects the side of the end of the terminal electrode facing away from the ceramic body is 60 ° to 90 °.
Preferably, the ceramic body further includes dielectric layers disposed in layers and internal electrodes disposed between adjacent two of the dielectric layers.
Preferably, the distance between the portion of the terminal electrode on the upper or lower surface of the ceramic body in the length direction of the dielectric layer is denoted as d1, the distance between the internal electrode and the end surface of the ceramic body to which the internal electrode is directed is denoted as d2, and d1 is greater than d 2.
Preferably, the edge of the tip of the inner electrode is provided as a circular arc transition.
Preferably, the internal electrodes include a first internal electrode and a second internal electrode, one end of the first internal electrode is connected to one of the terminal electrodes, a distance is provided between a terminal of the first internal electrode and the other terminal electrode, one end of the second internal electrode is connected to the terminal electrode that is not connected to the first internal electrode, a distance is provided between a terminal of the second internal electrode and the terminal electrode that is connected to the first internal electrode, and the first internal electrode and the second internal electrode are alternately disposed.
Preferably, the internal electrodes include a first internal electrode, a second internal electrode, and a third internal electrode, one end of the first internal electrode and one end of the second internal electrode are respectively connected to the two terminal electrodes, the first internal electrode and the second internal electrode are disposed opposite to each other, two ends of the third internal electrode are respectively spaced from the two terminal electrodes, and the third internal electrode and the first internal electrode are alternately disposed.
Preferably, the third internal electrode is disposed between the dielectric layers on the upper surface and the lower surface of the ceramic body and the dielectric layers adjacent thereto.
Preferably, the terminal electrodes also extend onto both side surfaces of the ceramic body.
The invention provides a multilayer ceramic capacitor, compared with the prior art, the multilayer ceramic capacitor has the beneficial effects that:
the multilayer ceramic capacitor comprises a ceramic body and terminal electrodes arranged on two end faces of the ceramic body, wherein the terminal electrodes extend to the upper surface and the lower surface of the ceramic body, the tail ends of the two terminal electrodes are oppositely arranged, a distance is reserved between the two terminal electrodes, and one side of the tail ends of the terminal electrodes facing the ceramic body is arranged to be arc-shaped. The tail end of the terminal electrode is arc-shaped towards one side of the ceramic body, the tail end of the terminal electrode is curved towards the inner surface of the ceramic body, the concentration degree of an electric field is reduced, the voltage resistance of the multilayer ceramic capacitor is improved, and the risk of being broken down and burnt is reduced.
Drawings
Fig. 1 is a sectional view of a prior art multilayer ceramic capacitor.
Fig. 2 is a schematic structural diagram of an embodiment of the present invention.
Fig. 3 is a cross-sectional view of a first embodiment of the present invention.
Fig. 4 is a sectional view of a second embodiment of the present invention.
Fig. 5 is a sectional view of a third embodiment of the present invention.
In the figure, 1, a ceramic body; 2. a terminal electrode; 11. a dielectric layer; 12. an inner electrode; 13. an upper surface of the ceramic body; 14. a side of the ceramic body; 15. an end face of the ceramic body; 121. a first internal electrode; 122. a second internal electrode; 123. a third internal electrode; 21. a transition portion.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example one
Referring to fig. 2 and 3, a multilayer ceramic capacitor according to a preferred embodiment of the present invention includes a ceramic body 1 and terminal electrodes 2 disposed on two end surfaces 15 of the ceramic body 1, the terminal electrodes 2 extend to an upper surface 13 and a lower surface of the ceramic body 1, ends of the two terminal electrodes 2 are disposed opposite to each other with a distance therebetween, and one side of the terminal electrode 2 facing the ceramic body 1 is disposed in an arc shape. The end through setting up terminal electrode 2 is circular-arc towards one side of ceramic body 1, and the end of terminal electrode 2 is the curved surface towards the inside face of ceramic body 1, alleviates the concentration degree of electric field, improves multilayer ceramic capacitor's withstand voltage performance, reduces the risk of being punctured and burning out. Specifically, the multilayer ceramic capacitor has a length ranging from 1.0mm to 5.6mm, a width ranging from 0.5mm to 5.0mm, and a thickness ranging from 0.5mm to 2.5 mm.
The portion of the terminal electrode 2 having the arc-shaped end is referred to as a transition portion 21, and the transition portion 21 extends to a side of the terminal electrode 2 away from the ceramic body 1. The terminal electrodes 2 are spaced apart from each other and insulated from each other. In a specific production implementation, a concave position may be provided on the ceramic body 1 at a position corresponding to the terminal electrode 2 so as to form the arc-shaped transition portion 21.
The transition portion 21 intersects the side 14 of the end of the terminal electrode 2 facing away from the ceramic body 1 at an angle alpha of 60 deg. -90 deg.. Preferably 90. If the angle α is greater than 90 °, it is difficult to form the arc-shaped transition portion 21; if the included angle α is smaller than 60 °, the effect of reducing the electric field concentration degree is poor.
The height of the end face 15 of the ceramic body 1 is 80% or more, preferably 90% or more of the thickness of the multilayer ceramic capacitor. If the height value of the end face 15 of the ceramic body 1 is small, the space for accommodating the internal electrode 12 is reduced, which is disadvantageous in obtaining high capacitance and may cause difficulty in positioning in some production processes; if this value is large, it is not easy to form the arc-shaped transition portion 21.
The ceramic body 1 further includes dielectric layers 11 arranged in layers and internal electrodes 12 arranged between adjacent two dielectric layers. The shape of the inner electrode 12 is preferably a rectangular laminar shape in order to obtain a large volume utilization rate and to facilitate production. The thickness of the internal electrode 12 is preferably 1 μm to 3 μm. The number is preferably 40 or more.
Here, the distance of the portion of the terminal electrode 2 located on the upper surface 13 or the lower surface of the ceramic body 1 in the length direction of the dielectric layer 11 is denoted as d1, the distance between the internal electrode 12 and the end surface 15 of the ceramic body 1 directed thereto is denoted as d2, and d1 is greater than d 2. Preferably, d1 is 10% -25% of the length of the multilayer ceramic capacitor. If d1 is small, it is inconvenient to solder the multilayer ceramic capacitor; if d1 is large, the length of the exposed surface of the ceramic body 1 is small, which is disadvantageous in terms of adsorption of the multilayer ceramic capacitor during the production process. The length of the exposed surface of the ceramic body 1 is more than 50% of the length of the multilayer ceramic capacitor, so that the multilayer ceramic capacitor can be conveniently adsorbed, the mounting efficiency is improved, the positioning is convenient, and the production qualified rate is improved. Preferably, d2 is 5% -15% of the length of the multilayer ceramic capacitor. When d2 is smaller, the process margin is insufficient, which easily causes the short circuit between the internal electrode 12 and the terminal electrode 2 not connected thereto, and when d2 is larger, a high capacitance is not easily obtained.
The edge of the tip of the inner electrode 12 is arranged as a circular arc transition. With such a configuration, the degree of charge concentration in the internal electrodes 12 can be reduced, and the withstand voltage performance of the multilayer ceramic capacitor can be further improved.
The internal electrodes 12 are spaced apart from the upper and lower surfaces and the two side surfaces 14 of the ceramic body 1 by a predetermined distance, respectively, in order to prevent moisture and mechanical damage. The distance between the inner electrode 12 and the upper surface 13 and the lower surface is larger than 0.05mm, and short circuit between the inner electrode 12 and the end electrode 2 is avoided.
Specifically, the internal electrodes 12 include first internal electrodes 121 and second internal electrodes 122, one end of the first internal electrode 121 is connected to one terminal electrode 2, a distance is provided between the end of the first internal electrode 121 and the other terminal electrode 2, one end of the second internal electrode 122 is connected to the terminal electrode 2 that is not connected to the first internal electrode 121, a distance is provided between the end of the second internal electrode 122 and the terminal electrode 2 connected to the first internal electrode 121, and the first internal electrodes 121 and the second internal electrodes 122 are alternately arranged. Thus, the first internal electrode 121 is insulated from the terminal electrode 2 not connected thereto, and the second internal electrode 122 is also insulated from the terminal electrode 2 not connected thereto. In addition, since the distances are smaller than half the length of each of the first and second internal electrodes 121 and 122, and an opposing area is secured between the first and second internal electrodes 121 and 122, thereby generating capacitance, the capacitance increases as the number of the first and second internal electrodes 121 and 122 alternately arranged increases. The ends of the internal electrodes 12 are offset from each other in the length direction of the multilayer ceramic capacitor to reduce the degree of electric field concentration.
Example two
The difference between the multilayer ceramic capacitor provided in the second embodiment and the first embodiment is that, referring to fig. 4, the terminal electrode 2 further extends to two side surfaces 14 of the ceramic body 1. The end of the terminal electrode 2 located on the side surface 14 of the ceramic body 1 has the same shape as the end of the terminal electrode 2 located on the upper and lower surfaces of the ceramic body 1 in the first embodiment, and the side surface 14 of the ceramic body 1 is also provided with a concave position corresponding to the end of the terminal electrode 2.
In the embodiment, by such a structure, the degree of electric field concentration of the terminal electrode 2 on the side surface 14 of the ceramic body 1 can be reduced, and the withstand voltage performance of the multilayer ceramic capacitor can be improved.
EXAMPLE III
The multilayer ceramic capacitor according to the third embodiment is different from the first embodiment in that, referring to fig. 5, the internal electrode 12 includes a first internal electrode 121, a second internal electrode 122, and a third internal electrode 123, one end of the first internal electrode 121 and one end of the second internal electrode 122 are respectively connected to the two terminal electrodes 2, the first internal electrode 121 and the second internal electrode 122 are disposed opposite to each other, two ends of the third internal electrode 123 are respectively spaced from the two terminal electrodes 2, and the third internal electrode 123 and the first internal electrode 121 are alternately disposed. Thus, the third internal electrode 123 is a floating electrode and is not connected to the terminal electrode 2. The first internal electrode 121 and the second internal electrode 122 respectively have an opposing area to the third internal electrode 123, and thus a capacitor series structure is formed, thereby distributing voltage and improving the withstand voltage performance of the multilayer ceramic capacitor.
A third internal electrode 123 is disposed between the dielectric layers on the upper surface 13 of the ceramic body 1 and the lower surface of the ceramic body 1 and the adjacent dielectric layers. Electric field concentration areas are formed at two ends of the third inner electrode 123, but because the surface of the tail end of the terminal electrode 2 facing the inside of the ceramic body 1 is a curved surface, the concentration degree of an electric field is reduced, the voltage resistance of the multilayer ceramic capacitor is improved, and the risk of being broken down and burnt is reduced.
In summary, the embodiment of the present invention provides a multilayer ceramic capacitor, in which a side of the terminal electrode 2 facing the ceramic body 1 is set to be arc-shaped, and a surface of the terminal electrode 2 facing the inside of the ceramic body 1 is set to be a curved surface, so as to reduce the concentration degree of an electric field, improve the voltage resistance of the multilayer ceramic capacitor, and reduce the risk of being burned down.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. The multilayer ceramic capacitor is characterized by comprising a ceramic body and terminal electrodes arranged on two end faces of the ceramic body, wherein the terminal electrodes extend to the upper surface and the lower surface of the ceramic body, the tail ends of the two terminal electrodes are oppositely arranged, a distance is reserved between the tail ends of the two terminal electrodes, and the tail ends of the terminal electrodes face one side of the ceramic body and are arranged to be arc-shaped.
2. The multilayer ceramic capacitor according to claim 1, wherein a portion where the end of the terminal electrode is provided in a circular arc shape is denoted as a transition portion extending to a side of the end of the terminal electrode facing away from the ceramic body.
3. The multilayer ceramic capacitor according to claim 2, wherein the angle α at which the transition portion intersects the side of the terminal end of the terminal electrode facing away from the ceramic body is 60 ° to 90 °.
4. The multilayer ceramic capacitor according to claim 1, wherein the ceramic body further comprises dielectric layers disposed in layers and internal electrodes disposed between adjacent two of the dielectric layers.
5. The multilayer ceramic capacitor as claimed in claim 4, wherein the portion of the terminal electrode located on the upper or lower surface of the ceramic body has a distance d1 in the length direction of the dielectric layer, the distance between the internal electrode and the end surface of the ceramic body to which it is directed has a distance d2, and d1 is greater than d 2.
6. The multilayer ceramic capacitor according to claim 4, wherein the edge of the tip of the inner electrode is provided as a circular arc transition.
7. The multilayer ceramic capacitor according to claim 4, wherein the internal electrodes include first internal electrodes having one end connected to one of the terminal electrodes and a distance between the end of the first internal electrode and the other terminal electrode, and second internal electrodes having one end connected to the terminal electrode not connected to the first internal electrode and a distance between the end of the second internal electrode and the terminal electrode connected to the first internal electrode, the first internal electrodes and the second internal electrodes being alternately arranged.
8. The multilayer ceramic capacitor according to claim 4, wherein the internal electrodes include first, second and third internal electrodes, one end of the first internal electrode and one end of the second internal electrode are connected to the two terminal electrodes, respectively, the first internal electrode is disposed opposite to the second internal electrode, both ends of the third internal electrode are spaced apart from both the two terminal electrodes, respectively, and the third internal electrodes are alternately disposed with the first internal electrodes.
9. The multilayer ceramic capacitor according to claim 8, wherein the third internal electrode is provided between the dielectric layers on the upper surface of the ceramic body and the lower surface of the ceramic body and the dielectric layers adjacent thereto.
10. The multilayer ceramic capacitor of claim 1 wherein the terminal electrodes also extend onto both sides of the ceramic body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210110940.0A CN114400143A (en) | 2022-01-29 | 2022-01-29 | Multilayer ceramic capacitor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210110940.0A CN114400143A (en) | 2022-01-29 | 2022-01-29 | Multilayer ceramic capacitor |
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| CN114400143A true CN114400143A (en) | 2022-04-26 |
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| CN202210110940.0A Pending CN114400143A (en) | 2022-01-29 | 2022-01-29 | Multilayer ceramic capacitor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115458331A (en) * | 2022-08-29 | 2022-12-09 | 广东风华高新科技股份有限公司 | Multilayer ceramic capacitor and preparation method thereof |
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2022
- 2022-01-29 CN CN202210110940.0A patent/CN114400143A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115458331A (en) * | 2022-08-29 | 2022-12-09 | 广东风华高新科技股份有限公司 | Multilayer ceramic capacitor and preparation method thereof |
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