CN209607597U - A kind of on-deformable high-layer sheets type ceramic dielectric capacitor of internal electrode - Google Patents
A kind of on-deformable high-layer sheets type ceramic dielectric capacitor of internal electrode Download PDFInfo
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- CN209607597U CN209607597U CN201920562910.7U CN201920562910U CN209607597U CN 209607597 U CN209607597 U CN 209607597U CN 201920562910 U CN201920562910 U CN 201920562910U CN 209607597 U CN209607597 U CN 209607597U
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Abstract
The utility model relates to ceramic capacitor manufacturing fields, more specifically, it is related to a kind of on-deformable high-layer sheets type ceramic dielectric capacitor of internal electrode, aim to solve the problem that the easily-deformable problem of high-layer sheets type ceramic dielectric capacitor internal electrode, its key points of the technical solution are that: including being located at bottom metallized layer, internal electrode, there is active layer, middle layer, wherein each internal electrode includes being connected to bottom metallized layer to connect the first electrode plate of positive pole, another bottom metallized layer is connected to connect the second electrode plate of power cathode, first electrode plate is arranged in parallel with second electrode plate, there is active layer to be filled between first electrode plate and second electrode plate；Capacitor is integrally divided into the small-sized capacitor of multiple groups by the middle layer, and every group of small-sized capacitor includes multiple to have active layer, multiple internal electrodes.The utility model is by the design of middle layer, so that can be supported by middle layer between the internal electrode of multi-layer capacitor, to be not susceptible to deform.
Description
Technical field
The utility model relates to ceramic capacitor manufacturing fields, more specifically, it relates to which a kind of internal electrode is not variable
The high-layer sheets type ceramic dielectric capacitor of shape.
Background technique
With the development of modern technologies, client proposes the requirement of smallerization to complete machine, and main purpose is to reduce complete machine
Weight and save space, then PCB circuit board certainly will be required increasingly minimize so that multilayer sheet type porcelain dielectric
Container is gradually to miniaturization.
Client is mainly to the greatest extent may be used in the case where voltage is certain to miniaturization multilayer type ceramic dielectric capacitor requirement
It can increase capacitance.According to the calculation formula of multilayer type ceramic dielectric capacitor: C=NKS/T, wherein C is capacitance, and N is shunt layer
Number, K is dielectric constant, and S is overlapping area, and T is thickness of dielectric layers, it is found that chip multilayer ceramic capacitor from calculation formula
Capacitance and dielectric thickness be in inverse ratio, it is proportional with dielectric constant, electrode overlapping area, interlayer is determining, size (electrode weight
Folded area) in identical situation, capacitance is bigger, it is necessary to more number of plies in parallel.
But the parallel connection number of plies is more, the more easy deformation of expanded by heating in process of internal electrode influences multilayer tablet
The service life of formula ceramic capacitor.
Therefore it needs to propose the new scheme of one kind to solve this problem.
Utility model content
In view of the deficienciess of the prior art, the purpose of this utility model is to provide a kind of internal electrode is on-deformable
High-layer sheets type ceramic dielectric capacitor, by the design of middle layer, so that energy between the internal electrode of multilayer type ceramic dielectric capacitor
It is enough to be supported by middle layer, to be not susceptible to deform.
The above-mentioned technical purpose of the utility model has the technical scheme that a kind of internal electrode is not easy
The high-layer sheets type ceramic dielectric capacitor of deformation is used to connect the bottom metallized layer of electricity, is connected to metal including being located at capacitor both ends
Change the internal electrode of bottom, the middle layer for having active layer, being connected to bottom metallized layer of adjacent internal electrode is isolated, wherein in described
Portion's electrode includes being connected to bottom metallized layer to connect the first electrode plate of positive pole, be connected to another bottom metallized layer with even
The second electrode plate of power cathode is connect, first electrode plate is arranged in parallel with second electrode plate, has active layer to be filled in first electrode plate
Between second electrode plate；Capacitor is integrally divided into the small-sized capacitor of multiple groups by middle layer, and every group of small-sized capacitor includes multiple
There are active layer, multiple internal electrodes.
First electrode plate and second electrode plate are connected on two bottom metallized layers, traditionally, will be overlapped each other
Part names be area in parallel；Since first electrode plate and second electrode plate itself have certain thickness, in Qu Yufei in parallel
Area in parallel is formed the deviation of thickness, this part deviation is in the initial process of manufacture, by there is active layer filling；
But in the processes such as follow-up sintering, due to there is active layer different from the material of internal electrode, the coefficient of expansion is also different,
And internal electrode thickness is far below effective layer thickness degree, therefore the phenomenon that internal electrode deforms is inevitable, works as internal electrode
When negligible amounts, the influence of this part deformation is also little, in the deviation range of permission, once but the quantity of internal electrode increasing
Add, thermal stress effect is lower to be pressed against each other and will substantially increase, when being more than the deviation range of permission, can make to have active layer with it is interior
Gap is generated between portion's electrode, even makes first electrode plate or second electrode plate when serious and have directly to disengage between active layer to divide
Layer, not only the requirement of design is not achieved in capacitance in this way, but also can greatly shorten the service life of capacitor；
Therefore, middle layer is arranged in section in the capacitor, and middle layer alleviates the deformation width of internal electrode by rigidity
Degree, in understanding, it is understood that for the capacitor that single big number of plies capacitor is isolated into multiple normal sizes using middle layer
Device, while the internal electrode of multiple capacitors is connected on same group of bottom metallized layer, to not only ensure that the number of plies in parallel, but also is protected
The bending angle for demonstrate,proving internal electrode is smaller, and amplitude of deformation is in the deviation range of permission.
The utility model is further arranged to: the both ends of capacitor are additionally provided with protection bottom metallized layer in bottom metallized layer outside
Barrier layer, be welding layer outside barrier layer.
Capacitor needs to weld on circuit boards, so the outermost layer of capacitor is welding layer, using welding need using
Metal material, barrier layer primarily to protection bottom metallized layer, prevent welding when bottom metallized layer made by thermal etching, shortening
Use the service life.
The utility model is further arranged to: the two sides of capacitor are equipped with bluff piece in the surface layer of internal electrode.
Bluff piece prevents internal electrode to be directly exposed to air for protecting internal electrode.
The utility model is further arranged to: middle layer and bluff piece use identical material, and thickness is identical.
The manufacture of middle layer can refer to the bluff piece manufacture of normal size capacitor, and the two uses identical material
Material, identical thickness, it is internal after reaching this thickness according to conclusion obtained in the heights Experiment of multiple change middle layer
The crooked radian of electrode will become sufficiently small, the range of variation for allowing it far smaller than.
The utility model is further arranged to: middle layer is equipped at least one, is filled between middle layer and internal electrode
Active layer.
In middle layer setting, each middle layer is used to capacitor being divided into two parts, so the quantity of middle layer needs
Will be depending on the requirement of capacitor, at least one.
The utility model is further arranged to: the middle layer two sides are equipped with metal layer.
By the design of metal layer, the hardness of middle layer is greatly increased, it is however noted that, metal layer cannot be simultaneously
It is connect with the bottom metallized layer at both ends, otherwise will be linked to be access, lose the basic function of capacitor.
In conclusion the utility model has the following beneficial effects:
First, by the design of middle layer, so that can be supported by middle layer between the internal electrode of multi-layer capacitor, from
And it is not easy to deform；
Second, considerably increasing the hardness of middle layer by the design of metal layer.
Third, multilayer ceramic dielectric capacitor can be made to possess more numbers of plies by the design of middle layer, that is to say, that electricity
Capacity can be done bigger.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the present embodiment.
In figure: 1, bottom metallized layer；2, internal electrode；21, first electrode plate；22, second electrode plate；3, there is active layer；4,
Middle layer；5, bluff piece；6, welding layer；7, barrier layer.
Specific embodiment
With reference to the accompanying drawings and examples, the utility model is described in detail.
Embodiment: a kind of on-deformable high-layer sheets type ceramic dielectric capacitor of internal electrode, as shown in Figure 1, including being located at
Capacitor both ends are used to connect the bottom metallized layer 1, the internal electrode 2 for being connected to bottom metallized layer 1, isolation adjacent internal electrode of electricity
2 middle layer 4 for having active layer 3, being connected to bottom metallized layer 1, the bluff piece 5 being covered on the outside of capacitor.
Having active layer 3 is ceramic dielectric layer.Internal electrode 2 be capacitor main part, including be connected to bottom metallized layer 1 with
It connects the first electrode plate 21 of positive pole, be connected to another bottom metallized layer 1 to connect the second electrode plate 22 of power cathode,
First electrode plate 21 is arranged in parallel with second electrode plate 22, have active layer 3 be filled in first electrode plate 21 and second electrode plate 22 it
Between, so that first electrode plate 21 is isolated with second electrode plate 22, traditionally, by first electrode plate 21 and second electrode plate 22
The part names to overlap each other are area in parallel.
In capacitor manufacture, need successively by ingredient, curtain coating, printing, lamination, cutting, biscuit chamfering, dumping, burning
Chamfering, sealing end, end burn, are electroplated, detecting, packing these steps after knot, sintering, capacitor finished product can be just obtained, in the mistake of manufacture
Cheng Zhong, since first electrode plate 21 and second electrode plate 22 itself have certain thickness, in area in parallel with non-area in parallel with regard to shape
At the deviation of thickness, this part deviation is in printing, lamination, by there is active layer 3 to make up to fill.
But in the processes such as follow-up sintering, active layer 3 is different from the material of internal electrode 2 due to having, and the coefficient of expansion is not yet
Together, the phenomenon that and 2 thickness of internal electrode is far below there is 3 thickness of active layer, therefore internal electrode 2 deforms is inevitable；When interior
When portion's 2 negligible amounts of electrode, the influence of this part deformation is also little, in the deviation range of permission；Once but internal electrode 2
Quantity increase, thermal stress effect is lower to be pressed against each other and will greatly increase, and when being more than the deviation range of permission, can make to have
Gap is generated between active layer 3 and internal electrode 2, and first electrode plate 21 or second electrode plate 22 are even made when serious and has active layer 3
Between directly disengage layering, not only the requirement of design is not achieved in capacitance in this way, but also can greatly shorten the use of capacitor
Service life.
Therefore, middle layer 4 is arranged in section in the capacitor, and middle layer 4 uses identical material with bluff piece 5 and thickness is identical,
Middle layer 4 alleviates the amplitude of deformation of internal electrode 2 by rigidity, in understanding, it is understood that use middle layer 4
Single big number of plies capacitor is isolated into the capacitor of multiple normal sizes, while the internal electrode 2 of multiple capacitors is connected to
On same group of bottom metallized layer 1, to not only ensure that the number of plies in parallel, but also guarantees that the bending angle of internal electrode 2 is smaller, deform width
Degree is to the extent permitted by the error.
Ordinary circumstance, the voltage rating of customer requirement capacitor is not higher than 25V, while capacitance requires to be 10uF.With length
0.06 inch, wide 0.03 inch of capacitor citing, on 150 layers of product in parallel, internal electrode 2 is curved before unused middle layer 4
Curvature number is more than 20 °, internal electrode 2 and to have between active layer 3 there are the ratio of gap and layering be more than 60%；And it uses intermediate
Layer 4 after, bending degree be no more than 5 °, internal electrode 2 and have between active layer 3 there are the ratio of gap and layering be 0, product close
Lattice rate greatly increases.
Meanwhile curved electrode causes in parallel since stress shrinks easily to be formed to disengage in corner during the sintering process
Number is reduced, to influence capacitance, through capacitance data statistics, its capacitance Cpk value is no more than 0.8 before unused middle layer 4, is used
Its capacitance Cpk is substantially 1.2 or more after middle layer 4.
If requirement of the client to capacitance further increases, multiple middle layers 4 also can be used, to further increase
Quantity in parallel.
In order to guarantee the hardness of middle layer 4, metal layer is equipped in the two sides of middle layer 4.To greatly increase middle layer 4
Hardness, it is however noted that, metal layer cannot be connect with the bottom metallized layer 1 at both ends simultaneously, it otherwise will be linked to be access,
Lose the basic function of capacitor.
Capacitor needs to weld on circuit boards, so the outermost layer of capacitor is set as welding layer 6, needs to make using welding
Metal material, such as pure tin or leypewter, wherein pure tin is to weld required by RoHs convenient for Denso.And bottom metallized layer 1
Usually silver or copper, to can be formed with the ceramic end face for having active layer 3 fine and close whole and be formed by internal electrode 2
Electrical characteristics are drawn.The specific material of bottom metallized layer 1 needs depending on 2 material of internal electrode, if 2 metal of internal electrode is
Palladium-silver, then bottom metallized layer 1 is generally using silver；If internal electrode 2 uses nickel, bottom metallized layer 1 is usually
Copper.
Bottom metallized layer 1 is soldered 6 thermal etching of layer when welding in order to prevent, between bottom metallized layer 1 and welding layer 6 also
Equipped with barrier layer 7, barrier layer 7 is usually to use nickel.
Embodiment two: a kind of on-deformable high-layer sheets type ceramic dielectric capacitor of internal electrode, as shown in Figure 1, with implementation
The difference of example one is: in order to measure, whether capacitor is able to bear 260 DEG C ± 5 DEG C, the high-temperature soldering of 10s ± 1s tried
It tests.
Meet after test:
(1) appearance: without visible damage；
(2) electric capacitance change: X7R characteristic ± 10%, NP0 characteristic ± 0.5%；
(3) loss tangent is not more than inception requirements value；
(4) insulation resistance is not less than inception requirements value.
Embodiment three: a kind of on-deformable high-layer sheets type ceramic dielectric capacitor of internal electrode, as shown in Figure 1, with implementation
The difference of example one is: in order to measure the adaptable respective curved test of capacitor, being tested.
Test method and experimental condition: capacitor is mounted in printed board, is bent downwardly 1mm with the rate of 1mm/s, examination
Meet after testing:
(1) appearance: without visible damage；
(2) electric capacitance change: X7R characteristic ± 10%, NP0 characteristic ± 5%.
Example IV: a kind of on-deformable high-layer sheets type ceramic dielectric capacitor of internal electrode, as shown in Figure 1, with implementation
The difference of example one is: for the high temperature service life of test capacitors, capacitor being put into 125 DEG C, the ring of 1.5 times of voltage ratings
In border, test in 1000 hours is carried out, performance meets after test:
(1) appearance: without visible damage；
(2) electric capacitance change: X7R characteristic ± 10%, NP0 characteristic ± 2%；
(3) loss tangent is not more than 2 times of inception requirements value；
(4) insulation resistance: NP0 is not less than 4000M Ω or 40M Ω uF, takes smaller；X7R not less than 2000M Ω or
50M Ω uF, takes smaller.
The above is only the preferred embodiment of the utility model, and the protection scope of the utility model is not limited merely to
Above-described embodiment, technical solution belonging to the idea of the present invention belong to the protection scope of the utility model.It should refer to
Out, for those skilled in the art, it is without departing from the principle of the utility model it is several improvement and
Retouching, these improvements and modifications also should be regarded as the protection scope of the utility model.
Claims (6)
1. a kind of on-deformable high-layer sheets type ceramic dielectric capacitor of internal electrode, it is characterised in that: including being located at capacitor two
Multiple internal electrodes (2), the isolation adjacent inner electricity held the bottom metallized layer (1) for connecing electricity, be connected to bottom metallized layer (1)
The middle layer (4) for having active layer (3), being connected to bottom metallized layer (1) of pole (2), wherein each internal electrode (2) includes connection
In bottom metallized layer (1) to connect the first electrode plate (21) of positive pole, be connected to another bottom metallized layer (1) to connect electricity
The second electrode plate (22) of source cathode, first electrode plate (21) are arranged in parallel with second electrode plate (22), have active layer (3) to be filled in
Between first electrode plate (21) and second electrode plate (22)；Capacitor is integrally divided into multiple groups small electrical by the middle layer (4)
Hold, every group of small-sized capacitor includes multiple to have active layer (3), multiple internal electrodes (2).
2. the on-deformable high-layer sheets type ceramic dielectric capacitor of a kind of internal electrode according to claim 1, feature exist
In: the both ends of capacitor are in the barrier layer (7) for being additionally provided with protection bottom metallized layer (1) outside bottom metallized layer (1), barrier layer (7)
It is outside welding layer (6).
3. the on-deformable high-layer sheets type ceramic dielectric capacitor of a kind of internal electrode according to claim 1, feature exist
In: the two sides of capacitor are equipped with bluff piece (5) in the surface layer of internal electrode (2).
4. the on-deformable high-layer sheets type ceramic dielectric capacitor of a kind of internal electrode according to claim 3, feature exist
In: middle layer (4) and bluff piece (5) use identical material, and thickness is identical.
5. the on-deformable high-layer sheets type ceramic dielectric capacitor of a kind of internal electrode according to claim 1, feature exist
In: middle layer (4) is equipped at least one, is filled with active layer (3) between middle layer (4) and internal electrode (2).
6. the on-deformable high-layer sheets type ceramic dielectric capacitor of a kind of internal electrode according to claim 1, feature exist
In: middle layer (4) two sides are equipped with metal layer.
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| CN201920562910.7U CN209607597U (en) | 2019-04-23 | 2019-04-23 | A kind of on-deformable high-layer sheets type ceramic dielectric capacitor of internal electrode |
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| CN201920562910.7U CN209607597U (en) | 2019-04-23 | 2019-04-23 | A kind of on-deformable high-layer sheets type ceramic dielectric capacitor of internal electrode |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116338142A (en) * | 2023-02-28 | 2023-06-27 | 浙江大学 | Device and method for measuring surface deformation of hydrate reservoir in supergravity experiment |
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2019
- 2019-04-23 CN CN201920562910.7U patent/CN209607597U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116338142A (en) * | 2023-02-28 | 2023-06-27 | 浙江大学 | Device and method for measuring surface deformation of hydrate reservoir in supergravity experiment |
| CN116338142B (en) * | 2023-02-28 | 2024-02-27 | 浙江大学 | Device and method for measuring surface deformation of hydrate reservoir in supergravity experiment |
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