A zinc oxide varistor of a composite electrode structure
By employing a wire and interdigitated electrode welding structure in the zinc oxide varistor, the problem of small electrode contact area is solved, conductivity and stability are improved, electric field distribution is optimized, and better performance is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YANYANG HENGYI ELECTRONICS
- Filing Date
- 2025-05-27
- Publication Date
- 2026-05-29
AI Technical Summary
The electrodes of existing composite electrode structures for zinc oxide varistors are cylindrical, resulting in a small contact area, which affects conductivity and performance.
The electrode is formed by integrating wires and interdigitated electrodes, which are soldered onto the zinc oxide layer to increase the effective contact area and inhibit silver ion migration. The conductivity is improved by combining silver-graphene composite material, and the stability of the electrode is enhanced by the encapsulation and fixation structure of epoxy resin layer and ceramic layer.
It improves conductivity, reduces contact resistance, enhances electrode stability and performance, and optimizes electric field distribution.
Smart Images
Figure CN224304462U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of zinc oxide varistors, specifically a zinc oxide varistor with a composite electrode structure. Background Technology
[0002] Varistors, as a type of nonlinear resistive element, are widely used in the circuit protection of ICs and various electronic devices due to their excellent transient voltage suppression performance, preventing damage to equipment caused by static electricity, surges or other transient currents (such as lightning strikes).
[0003] For example, the zinc oxide varistor with a composite electrode structure authorized by publication number "CN203617055U" solves the problem that the structural defects of the copper electrode in existing composite electrode structure zinc oxide varistors are magnified and extended to the surface, resulting in a loose structure after the copper electrode is thickened, and even peeling and cracking in severe cases. The electrode structure of the above-mentioned multilayer metal thin film effectively enhances the density of the zinc oxide varistor electrode layer under sputtering process, ensuring that the electrode layer thickness can meet the safe thickness required for zinc oxide varistors. Considering that the existing composite electrode structure zinc oxide varistors use solder to directly weld the electrodes, the overall shape of the electrodes is cylindrical, and the effective contact area of the electrodes is small. Utility Model Content
[0004] The purpose of this invention is to solve the problem that existing zinc oxide varistors with composite electrode structures have a small effective contact area due to the overall cylindrical shape of the electrodes. Therefore, this invention proposes a zinc oxide varistor with a composite electrode structure.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a zinc oxide varistor with a composite electrode structure, comprising an epoxy resin layer and a ceramic layer, wherein the inner wall of the epoxy resin layer is fixedly connected to the ceramic layer, the inner wall of the ceramic layer is fixedly connected to a silver plating layer, the inner wall of the silver plating layer is fixedly connected to a nickel-based alloy layer, the outer wall of the nickel-based alloy layer is fixedly connected to the zinc oxide layer, and a current-conducting mechanism is connected to the outer wall of the zinc oxide layer.
[0006] Preferably, the current guiding mechanism includes a solder layer, the inner wall of which is fixedly connected to a zinc oxide layer, the inner wall of which is fixedly connected to an interdigitated electrode, the end of which is fixedly connected to a wire, and the outer wall of which is fixedly connected to an outer layer.
[0007] Preferably, the outer wall of the interdigitated electrode is bonded to the zinc oxide layer, and the outer wall of the outer layer is connected to a protective mechanism.
[0008] Preferably, the protective mechanism includes an adhesive layer, the outer wall of which is fixedly connected to an epoxy resin layer, the outer wall of which is fixedly connected to a protective block, and the inner wall of the protective block is machined with through holes.
[0009] Preferably, the inner wall of the through hole abuts against the outer layer.
[0010] The zinc oxide varistor with a composite electrode structure proposed in this utility model has the following advantages: after the wire and the interdigitated electrode are integrated, the interdigitated electrode is soldered to the zinc oxide layer using a solder layer. The wire and the interdigitated electrode can improve conductivity and inhibit silver ion migration. The interdigitated electrode increases the area of the wire end, which can increase the effective contact area between the wire and the interdigitated electrode and the zinc oxide layer, reduce contact resistance, and improve the performance of the zinc oxide varistor. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the structure of this utility model;
[0012] Figure 2 for Figure 1 Schematic diagram of the internal cross-section of the epoxy resin layer;
[0013] Figure 3 for Figure 1 Schematic diagram of the middle solder layer structure;
[0014] Figure 4 for Figure 2 Schematic diagram of the three-dimensional structure of the central protective mechanism;
[0015] Figure 5 for Figure 2 Schematic diagram of the three-dimensional structure of the central guide mechanism.
[0016] In the diagram: 1. Epoxy resin layer, 2. Ceramic layer, 3. Silver plating layer, 4. Nickel-based alloy layer, 5. Zinc oxide layer, 6. Conduction mechanism, 601. Solder layer, 602. Interdigitated electrode, 603. Conductor wire, 604. Outer layer, 7. Protective mechanism, 701. Adhesive layer, 702. Protective block, 703. Through hole. Detailed Implementation
[0017] The present invention will be further described below with reference to the accompanying drawings:
[0018] Example 1:
[0019] Please see Figure 1-5In this embodiment, a zinc oxide varistor with a composite electrode structure includes an epoxy resin layer 1 and a ceramic layer 2. The inner wall of the epoxy resin layer 1 is fixedly connected to the ceramic layer 2, the inner wall of the ceramic layer 2 is fixedly connected to the silver plating layer 3, the inner wall of the silver plating layer 3 is fixedly connected to the nickel-based alloy layer 4, the outer wall of the nickel-based alloy layer 4 is fixedly connected to the zinc oxide layer 5, and a current guiding mechanism 6 is connected to the outer wall of the zinc oxide layer 5.
[0020] The current guiding mechanism 6 includes a solder layer 601, through which the interdigitated electrode 602 is soldered to the zinc oxide layer 5. The wire 603 and the interdigitated electrode 602 can improve conductivity and suppress the migration and current guiding effect of silver ions. The inner wall of the solder layer 601 is fixedly connected to the zinc oxide layer 5, and the inner wall of the solder layer 601 is fixedly connected to the interdigitated electrode 602. The end of the interdigitated electrode 602 is fixedly connected to the wire 603, and the outer wall of the wire 603 is fixedly connected to the outer layer 604.
[0021] After the wire 603 and the finger-shaped electrode 602 are integrated, the finger-shaped electrode 602 is soldered to the zinc oxide layer 5 using a solder layer 601. The wire 603 and the finger-shaped electrode 602 can improve conductivity and inhibit silver ion migration. The finger-shaped electrode 602 expands the area of the end of the wire 603, which can increase the effective contact area between the wire 603 and the finger-shaped electrode 602 and the zinc oxide layer 5, reduce contact resistance, and improve the performance of the zinc oxide varistor.
[0022] The outer wall of the interdigitated electrode 602 is attached to the zinc oxide layer 5. The outer wall of the outer layer 604 is connected to a protective mechanism 7. The protective block 702 passes through the outer layer 604, so that the adhesive layer 701 is attached to the outside of the epoxy resin layer 1, so that the protective block 702 provides protection for the outer layer 604. The protective mechanism 7 includes the adhesive layer 701. The outer wall of the adhesive layer 701 is fixedly connected to the epoxy resin layer 1. The outer wall of the adhesive layer 701 is fixedly connected to the protective block 702. The inner wall of the protective block 702 is processed with a through hole 703. The inner wall of the through hole 703 abuts against the outer layer 604.
[0023] Working principle:
[0024] After the wire 603 and the finger-shaped electrode 602, made of silver-graphene composite material (Ag+1% graphene), are integrally formed, the finger-shaped electrode 602 is soldered to the zinc oxide layer 5 using a solder layer 601. The wire 603 and the finger-shaped electrode 602 made of silver-graphene composite material (Ag+1% graphene) can improve conductivity and inhibit silver ion migration. The finger-shaped electrode 602 enlarges the area of the end of the wire 603, which can increase the effective contact area between the wire 603 and the finger-shaped electrode 602 and the zinc oxide layer 5, and reduce the contact resistance (target <0). The zinc oxide 5, nickel-based alloy layer 4, and silver plating layer 3 are arranged from the inside out to optimize the electric field distribution. Using a sintering and molding process, the ceramic layer 2 and epoxy resin layer 1 are sequentially wrapped and fixed to the outside of the silver plating layer 3. Finally, the protective block 702 containing the adhesive layer 701 is passed through the outer layer 604. The outer wall of the outer layer 604 will press against the through hole 703 in the inner wall of the protective block 702, so that the adhesive layer 701 is adhered to the outside of the epoxy resin layer 1. The protective block 702 can cause the outer layer 604 and the wire 603 to break at the epoxy resin layer 1.
[0025] The internal structure of the varistor consists of a zinc oxide layer 5 composed of many zinc oxide grains. When the zinc oxide layer 5 is subjected to current transmission by the wire 603 and the interdigitated electrode 602, the grains are separated by a high resistivity grain boundary layer, forming a potential barrier similar to a Zener diode. The series and parallel connection of these units determines the breakdown voltage and current carrying capacity of the varistor. Since each unit can disperse energy, the performance of the zinc oxide varistor is achieved.
[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A zinc oxide varistor with a composite electrode structure, comprising an epoxy resin layer (1) and a ceramic layer (2), wherein the inner wall of the epoxy resin layer (1) is fixedly connected to the ceramic layer (2), characterized in that: The inner wall of the ceramic layer (2) is fixedly connected to the silver plating layer (3), the inner wall of the silver plating layer (3) is fixedly connected to the nickel-based alloy layer (4), the outer wall of the nickel-based alloy layer (4) is fixedly connected to the zinc oxide layer (5), and the outer wall of the zinc oxide layer (5) is connected to a flow guiding mechanism (6). The flow guiding mechanism (6) includes a solder layer (601), the inner wall of the solder layer (601) is fixedly connected to the zinc oxide layer (5), the inner wall of the solder layer (601) is fixedly connected to the interdigitated electrode (602), the end of the interdigitated electrode (602) is fixedly connected to the wire (603), and the outer wall of the wire (603) is fixedly connected to the outer layer (604).
2. The zinc oxide varistor with a composite electrode structure according to claim 1, characterized in that: The outer wall of the interdigitated electrode (602) is attached to the zinc oxide layer (5), and the outer wall of the outer layer (604) is connected to a protective mechanism (7).
3. The zinc oxide varistor with a composite electrode structure according to claim 2, characterized in that: The protective mechanism (7) includes an adhesive layer (701), the outer wall of which is fixedly connected to the epoxy resin layer (1), the outer wall of which is fixedly connected to the protective block (702), and the inner wall of the protective block (702) is processed with a through hole (703).
4. The zinc oxide varistor with a composite electrode structure according to claim 3, characterized in that: The inner wall of the through hole (703) abuts against the outer layer (604).