CN215680279U - Voltage dependent resistor electrode structure - Google Patents
Voltage dependent resistor electrode structure Download PDFInfo
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- CN215680279U CN215680279U CN202122205752.XU CN202122205752U CN215680279U CN 215680279 U CN215680279 U CN 215680279U CN 202122205752 U CN202122205752 U CN 202122205752U CN 215680279 U CN215680279 U CN 215680279U
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Abstract
The utility model discloses a piezoresistor electrode structure, which comprises a ceramic body and an electrode; the electrodes comprise a bottom electrode and a surface electrode, the bottom electrode is positioned on the surface of the porcelain body, the area of the bottom electrode is smaller than that of the porcelain body, and the bottom electrode is used for forming an overflowing layer; the bottom electrode is provided with a welding window for improving the weldability of the electrode; the surface electrode is partially or completely covered on the surface of the bottom electrode, or the surface electrode is partially or completely covered on the surface of the bottom electrode and the surface of the welding window, and is used for forming a welding layer. The bottom electrode is provided with at least one blank area as a welding window, base metal materials are printed, a weldable surface electrode is sputtered after high-temperature sintering, and the blank area is covered by the surface electrode; and solder is covered after solder is welded at a blank area near a welding wire, so that the problem of local overcurrent difference caused by over-thin electrode layer near a welding point is avoided.
Description
Technical Field
The utility model relates to the technical field of piezoresistors, in particular to an electrode structure of a piezoresistor.
Background
At present, a piezoresistor is an overvoltage protection element which is most widely applied, and presents a high-resistance state under a voltage-sensitive conduction voltage, when a surge generated by circuit interference or lightning reaches or exceeds the voltage-sensitive conduction voltage, a piezoresistor ceramic chip connected to a circuit presents a low-resistance state within tens of microseconds, and is conducted to release the surge current so as to protect a rear-end device; in order to improve the current passing capability and the multiple surge impact resistance of a product, an electrode layer with a certain thickness needs to be prepared; in consideration of the weldability of the electrode and the mature property of the process, most electrode materials are printed by using noble metal silver paste or copper paste and then baked with nitrogen protection.
However, the former is high in price, and the latter has the problems of low atmosphere single-layer sintering yield, low yield and poor weldability; patent CN210837331U adopts 2 times of printing, bottom electrode is printed with base metal conductive paste such as aluminum paste, zinc paste, molybdenum paste to increase the over-current capability of the electrode, and then primary surface electrode silver paste is printed in superposition to provide solderability, but noble metal silver is also used; the patent CN203617055U adopts sputtering base metal, the metal layer is thick and compact, and the impact resistance is good, but the production efficiency is low when sputtering thicker film layer, such as 14D.
Therefore, how to provide a piezoresistor electrode structure with low cost and good weldability is a problem that needs to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention provides an electrode structure of a varistor, wherein at least one welding window is disposed on a bottom electrode, and due to poor weldability of printing technology, the welding windows of different shapes are disposed to ensure firm and reliable welding of the electrode of the varistor, thereby maintaining the over-current resistance of the varistor, and simultaneously reducing the usage amount of electrode materials, or under the same material consumption, making the through-current resistance of the varistor better, and meeting the requirements of low cost and good weldability.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a piezoresistor electrode structure comprises a ceramic body and an electrode;
the electrodes comprise bottom electrodes and surface electrodes, the bottom electrodes are positioned on the surface of the porcelain body, the area of the bottom electrodes is smaller than that of the porcelain body, and the bottom electrodes are used for forming an overflowing layer;
the bottom electrode is provided with a welding window for improving the weldability of the electrode;
the surface electrode partially or completely covers the surface of the bottom electrode, or the surface electrode partially or completely covers the surface of the bottom electrode and the surface of the welding window, and is used for forming a welding layer.
Preferably, the surfaces of the ceramic body and the bottom electrode are circular or rectangular, and the surface electrode is circular or rectangular.
Preferably, the welding window comprises a first welding window, the first welding window is positioned in the center of the bottom electrode, and the area of the first welding window is 2mm2-300mm2。
Preferably, at least two welding windows are arranged, the welding windows are arranged in a surrounding mode in sequence by taking the welding window at the center of the bottom electrode as the center, and the area of all the welding windows is 2mm2-300mm2。
Preferably, the welding windows on the same bottom electrode are the same or different in shape.
According to the technical scheme, compared with the prior art, the utility model discloses and provides a piezoresistor electrode structure which comprises a ceramic body and electrodes, wherein each electrode comprises a bottom electrode and a surface electrode, at least one blank area is arranged on the bottom electrode and used as a welding window, base metal materials are printed, the weldable surface electrode is sputtered after high-temperature sintering, the surface electrode covers the blank area, the blank area is flat, the wetting angle is large, the weldability can be obviously improved, and the blank area does not need to be printed with electrode materials, so that the use amount of the electrode materials is reduced; solder is covered after the solder in the blank area near the welding wire is welded, so that the problem of local overcurrent difference caused by over-thin electrode layer near the welding point is avoided; the special soldering flux and dip soldering mode are not needed, so that the reliability of soldering tin can be improved; the method is simple to implement and easy for large-scale production.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic diagram of an electrode structure in embodiment 1 provided by the present invention.
Fig. 2 is a schematic diagram of an electrode structure in embodiment 2 of the present invention.
Fig. 3 is a schematic diagram of an electrode structure in embodiment 3 provided by the present invention.
Fig. 4 is a schematic diagram of an electrode structure in embodiment 4 of the present invention.
Fig. 5 is a schematic diagram of an electrode structure in embodiment 5 provided by the present invention.
In the figure, 1-ceramic body, 21-bottom electrode, 22-face electrode, 211-first welding window, 212-second welding window, 213-third welding window, 214-fourth welding window, 215-fifth welding window, 216-sixth welding window, 217-seventh welding window, 218-eighth welding window, 219-ninth welding window, 2110-tenth welding window.
Detailed Description
The technical solutions 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 it is obvious that the described embodiments are only a part of the embodiments of the present invention, and 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.
In the embodiment, the piezoresistor electrode structure comprises a ceramic body 1 and an electrode; the two electrodes are respectively positioned on two surfaces of the porcelain body 1, each electrode comprises a bottom electrode 21 and a surface electrode 22, the bottom electrode 21 is positioned on the surface of the porcelain body 1, the area of the bottom electrode 21 is smaller than that of the porcelain body 1, and the bottom electrode 21 is used for forming an overflowing layer; the bottom electrode 21 is provided with a welding window for improving the weldability of the electrode; the surface electrode 22 is partially or entirely covered on the surface of the bottom electrode 21, or the surface electrode 22 is partially or entirely covered on the surface of the bottom electrode 21 and the surface of the welding window for forming a welding layer. When the surface electrode 22 partially or completely covers the surface of the bottom electrode 21, the base metal material of the bottom electrode 21 is easy to oxidize when being sintered and infiltrated at high temperature, and is agglomerated into large particles by wrapping micro particles so as to resist oxidation, the sintered bottom electrode 21 is microcosmically in a nipple-shaped bulge, and due to the water repellent effect of lotus leaves, the soldering tin infiltration angle is small, tin points are not easy to diffuse, and the weldability is poor. Therefore, the bottom electrode 21 is provided with the welding window, the surface electrode is sputtered after high-temperature sintering and infiltration, the surface electrode 22 covers the blank area, the bottom of the blank area is flat, the infiltration angle is large, the soldering tin material after high-temperature melting overcomes the surface tension, a narrow gap is formed between the soldering tin material and the lead, the water repellent effect of the bottom electrode 21 can be broken through under the capillary action, and the weldability is improved; and the solder is covered on the blank area near the welding wire after the solder, so that the problem of local overcurrent difference caused by over-thin electrode layer near the welding point is solved.
In this embodiment, the surface of the ceramic body 1 and the bottom electrode 21 is circular or rectangular, and the surface electrode 22 is circular or rectangular. If the ceramic body 1 is circular, the two electrodes are the front and back sides of the circular shape, the front and back sides are both provided with the bottom electrode 21 and the surface electrode 22, and the bottom electrodes 21 on the two sides are smaller than the area of the ceramic body 1; if the ceramic body 1 is rectangular, the two electrodes are respectively positioned on two large surfaces of the rectangle, the two surfaces are both provided with the bottom electrode 21 and the surface electrode 22, the periphery is not provided with the electrodes, and the two bottom electrodes 21 are both smaller than the area of the ceramic body 1.
In this embodiment, at least two welding windows are provided, the welding windows are arranged in a surrounding manner with the welding window at the center of the bottom electrode 21 as the center, and all the welding windows are weldedThe area of the window joint is 2mm2-300mm2. Namely, the utility model sets a plurality of welding windows for large sheet diameter, realizes uniform flow by adjusting the printing line width of the bottom electrode 21, and the ceramic body 1 can uniformly heat during impact, thereby avoiding expansion and cracking of the coating caused by local overheating.
In the present embodiment, the welding windows on the same bottom electrode 21 are the same or different in shape.
Example 1
As shown in FIG. 1, the utility model discloses a piezoresistor electrode structure, comprising a ceramic body 1 and an electrode; the electrodes comprise a bottom electrode 21 and a surface electrode 22, the bottom electrode 21 is positioned on the surface of the porcelain body 1, the area of the bottom electrode 21 is smaller than that of the porcelain body 1, and the bottom electrode 21 is used for forming an overflowing layer; the bottom electrode 21 is provided with a welding window for improving the weldability of the electrode; the surface electrode 22 is partially or entirely covered on the surface of the bottom electrode 21, or the surface electrode 22 is partially or entirely covered on the surface of the bottom electrode 21 and the surface of the welding window for forming a welding layer. The welding window includes a first welding window 211, the first welding window 211 is a circle having a radius ranging from 1 to 9mm, is located at the center of the bottom electrode 21, and is used to improve the weldability of the electrode, and the first welding window has an area of 2mm2-300mm2。
In embodiment 1, the description of the shape, number and arrangement of the welding windows in the utility model is only one specific example, and the rest of the implementation modes of embodiment 1 are as follows: such as any variation in the shape, number and spacing of the solder windows, is within the scope of the present invention.
Example 2
As shown in fig. 2, the surface of the bottom electrode 21 is circular, the welding windows include a second welding window 212 and a third welding window 213, the second welding window 212 is a circle with a radius of 1-5mm, the second welding window 212 is located at the center of the bottom electrode 21, the third welding window 213 is in a fan-ring shape, twelve third welding windows 213 are arranged around the second welding window 212, and the sum of the areas of the third welding windows 213 is 2-300mm2And all welding window areas are 5mm2-300mm2。
In embodiment 2, the description of the shape, number and arrangement of the welding windows in the utility model is only one specific example, and the rest of the implementation modes of embodiment 2 are as follows: such as any variation in the shape, number and spacing of the solder windows, is within the scope of the present invention.
Example 3
As shown in fig. 3, the surface of the bottom electrode 21 is circular, the welding windows include a fourth welding window 214, a fifth welding window 215, and a sixth welding window 216, the fourth welding window 214 takes the form of a circle having a radius ranging from 0.5 to 5mm, and is located at the center of the bottom electrode 21, the fifth welding window 215 and the sixth welding window 216 are respectively circular rings concentric with the circle and having different radii, the radius range of the circular ring is 1-10mm, the interval range is 0.5-3mm, that is, the fifth welding window 215 is centered at the center of the fourth welding window 214, and has a radius range of 1-10mm and a spacing range of 0.5-3mm, the sixth welding window 216 is also centered at the center of the fourth welding window 214, and has a radius range of 1-10mm and a spacing range of 0.5-3mm, its radius is larger than that of the fifth welding window 215, and all welding windows have an area of 2 mm.2-300mm2。
In embodiment 3, the description of the shape, number and arrangement of the welding windows in the utility model is only one specific example, and the rest of the implementation modes of embodiment 3 are as follows: such as any variation in the shape, number and spacing of the solder windows, is within the scope of the present invention.
Example 4
As shown in fig. 4, the surface of the bottom electrode 21 is circular, the welding windows include a seventh welding window 217 and an eighth welding window 218, the seventh welding window 217 is a circle having a radius of 1-5mm and is located at the center of the bottom electrode 21, the eighth welding window 218 is a circle having a radius of 0.5-5mm, the eight eighth welding windows 218 are all arranged around the seventh welding window 217 as the center, and the area of all the welding windows is 2mm2-300mm2。
In embodiment 4, the description of the shape, number and arrangement of the welding windows in the utility model is only one specific example, and the rest of the implementation modes of embodiment 4 are as follows: such as any variation in the shape, number and spacing of the solder windows, is within the scope of the present invention.
Example 5
As shown in fig. 5, the surface of the bottom electrode 21 is rectangular, the welding windows include a ninth welding window 219 and a tenth welding window 2110, the ninth welding window 219 is rectangular and is located at the center of the bottom electrode 21, and the area of the rectangle is greater than 4mm2The tenth welding window 2110 is a circle with a radius of 0.5-5mm, six tenth welding windows 2110 are arranged around the ninth welding window 219, and the area of all the welding windows is 2mm2-300mm2。
In embodiment 5, the description of the shape, number and arrangement of the welding windows in the utility model is only one specific example, and the rest of the implementation modes of embodiment 5 are as follows: such as any variation in the shape, number and spacing of the solder windows, is within the scope of the present invention.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. A piezoresistor electrode structure is characterized by comprising a ceramic body and an electrode;
the electrodes comprise bottom electrodes and surface electrodes, the bottom electrodes are positioned on the surface of the porcelain body, the area of the bottom electrodes is smaller than that of the porcelain body, and the bottom electrodes are used for forming an overflowing layer;
the bottom electrode is provided with a welding window for improving the weldability of the electrode;
the surface electrode partially or completely covers the surface of the bottom electrode, or the surface electrode partially or completely covers the surface of the bottom electrode and the surface of the welding window, and is used for forming a welding layer.
2. A varistor electrode structure according to claim 1, wherein said ceramic body and said bottom electrode have circular or rectangular surfaces and said face electrode has circular or rectangular surfaces.
3. A varistor electrode structure according to claim 1, wherein said welding window comprises a first welding window, said first welding window being located in the center of said bottom electrode, and said first welding window having an area of 2mm2-300mm2。
4. A varistor electrode structure according to claim 1, wherein said welding windows are arranged in at least two, said welding windows are arranged in a circle in order from the welding window at the center of said bottom electrode, and all the welding windows have a total area of 2mm2-300mm2。
5. A varistor electrode structure according to claim 4, wherein said welding windows located in the same said bottom electrode are of the same or different shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122205752.XU CN215680279U (en) | 2021-09-13 | 2021-09-13 | Voltage dependent resistor electrode structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122205752.XU CN215680279U (en) | 2021-09-13 | 2021-09-13 | Voltage dependent resistor electrode structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215680279U true CN215680279U (en) | 2022-01-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122205752.XU Active CN215680279U (en) | 2021-09-13 | 2021-09-13 | Voltage dependent resistor electrode structure |
Country Status (1)
| Country | Link |
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| CN (1) | CN215680279U (en) |
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- 2021-09-13 CN CN202122205752.XU patent/CN215680279U/en active Active
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