Inner electrode structure of thermistor

Abstract

The utility model discloses a thermistor inner electrode structure which comprises an electrode pin end, a resistor base layer and a covering surface layer, in the using process, the electrode pin end is installed in the resistor base layer in an embedded mode, so that only the surface part of the electrode pin end is exposed out of the resistor base layer, the protrusion of the electrode pin end is reduced, and the service life of the thermistor is prolonged. Excessive protruding abrasion of the electrode pin end made of metal materials to the covering surface layers on the two sides is fundamentally reduced, meanwhile, the resistor base layer can directly absorb heat emitted by the electrode pin end, and therefore the problem of overheat loss of the electrode pin end is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a thermistor technology field, concretely is a thermistor internal electrode structure. BACKGROUND

[0002] Thermistor is a sensor resistance, and its resistance value changes along with temperature change. According to temperature coefficient difference, it is divided into positive temperature coefficient thermistor and negative temperature coefficient thermistor;The resistance value of positive temperature coefficient thermistor increases along with temperature rise, and the resistance value of negative temperature coefficient thermistor decreases along with temperature rise, and they belong to semiconductor devices.

[0003] In prior art, the publication number "CN210091843U" discloses a PTC thermistor for high voltage, including PTC thermistor body and electrode layer;PTC thermistor body is polyhedral structure, and electrode layer is arranged on the opposite two faces of polyhedron, the plane where the electrode layer is located and the plane where the heat transfer surface of PTC thermistor body is located form an angle greater than 45 °, and the area ratio of the plane where the electrode layer is located and the plane where the heat transfer surface of PTC thermistor body is located is less than 1:2. The utility model makes the heat conduction direction and the current direction not in the same dimension, thereby solve the contradiction that electrode spacing is large and heat conduction path is short under higher voltage. The utility model can adopt the PTC thermistor with thicker two-electrode spacing to improve the voltage resistance of PTC thermistor, and can also adopt the PTC thermistor with thinner heat conduction distance, so that the internal and surface temperature difference of PTC thermistor is small, and it is beneficial to more efficient performance of PTC thermistor.

[0004] But prior art still has great deficiency, for example:

[0005] Thermistor in the use process, due to environmental temperature is too high or too low, the resistance wire insulation protective layer of thermistor wears and tears after and physical damage, such as collision or extrusion, can lead to the internal structure of thermistor damage, thereby affecting its performance, the above-mentioned device and prior art, all lack the tear-resistant wear function of insulation protective layer, and simultaneously lack the electrode structure design for environmental temperature change, so that the service life of thermistor is poor. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing a thermistor internal electrode structure to solve the problems in the above background art.

[0007] In order to realize the above object, the utility model provides the following technical scheme: a thermistor inner electrode structure, including electrode foot end, resistance base layer and covering surface layer, the electrode foot end is embeddedly installed on the resistance base layer surface, the covering surface layer is provided with two layers, two covering surface layers are buckled and installed on the resistance base layer surface, and the gap between adjacent resistance base layer and covering surface layer is filled with sealing green glue.

[0008] Preferably, the covering surface layer comprises a heat-conducting layer, a heat-dissipating layer, a fire-resistant layer and a tear-resistant glue layer.

[0009] Preferably, the heat-conducting layer is made of graphite heat-conducting material.

[0010] Preferably, the heat-dissipating layer is made of three-layer composite copper foil.

[0011] Preferably, the fire-resistant layer is made of ceramic or high polymer composite material.

[0012] Preferably, the resistance base layer surface is provided with heat-insulating grooves, and the resistance base layer surface is also provided with heat-conducting pads.

[0013] Compared with the prior art, the utility model has the advantages that:

[0014] The electrode foot end is embeddedly installed in the resistance base layer, so that only the surface part of the electrode foot end is exposed from the resistance base layer, the protrusion of the electrode foot end is reduced, the excessive protruding wear of the electrode foot end of metal material on the two covering surface layers is fundamentally reduced, and the resistance base layer can directly absorb the heat emitted from the electrode foot end, so that the overheating loss problem of the electrode foot end is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the whole schematic view of the utility model device;

[0016] Figure 2 It is the sealing green glue part schematic view in the utility model;

[0017] Figure 3 It is the resistance base layer part schematic view in the utility model;

[0018] Figure 4 It is the covering surface layer schematic view in the utility model;

[0019] Figure 5 It is the heat-conducting layer, heat-dissipating layer, fire-resistant layer and tear-resistant glue layer part composition schematic view in the utility model.

[0020] In the drawing: 1, electrode foot end; 2, covering surface layer; 21, heat-conducting layer; 22, heat-dissipating layer; 23, fire-resistant layer; 24, tear-resistant glue layer; 3, resistance base layer; 31, heat-insulating groove; 32, heat-conducting pad; 4, sealing green glue. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be apparently and completely described in connection with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the utility model.

[0022] Please refer to Figures 1-5 The utility model provides a technical scheme:

[0023] Embodiment one: a thermistor inner electrode structure: including electrode foot end 1, resistance base layer 3 and cover surface layer 2, electrode foot end 1 is embedded in the surface of resistance base layer 3, cover surface layer 2 is provided with two layers, two cover surface layers 2 are buckled and installed on the surface of resistance base layer 3, the gap between adjacent resistance base layer 3 and cover surface layer 2 is filled with sealing green glue 4, the surface of resistance base layer 3 is provided with heat insulation groove 31, and the surface of resistance base layer 3 is also provided with heat conduction pad 32.

[0024] Cover surface layer 2 includes heat conduction layer 21, heat dissipation layer 22, fire-resistant layer 23 and anti-tear glue layer 24.

[0025] Heat conduction layer 21 is provided with graphite heat conduction material.

[0026] Heat dissipation layer 22 is provided with three layers of composite copper foil.

[0027] Fire-resistant layer 23 is provided with ceramic or high polymer composite material.

[0028] Working principle: in the process of using the device, electrode foot end 1 is installed in resistance base layer 3 by embedding, so that only the surface part of electrode foot end 1 is exposed to resistance base layer 3, the protrusion of electrode foot end 1 is reduced, the excessive protruding wear of electrode foot end 1 of metal material to two cover surface layers 2 is fundamentally reduced, and at the same time, resistance base layer 3 can directly absorb the heat emitted from electrode foot end 1, thereby reducing the overheating loss problem of electrode foot end 1.

[0029] Resistance base layer 3 is installed on both sides by sealing green glue 4, cover surface layer 2 is combined with heat conduction layer 21, heat dissipation layer 22, fire-resistant layer 23 and anti-tear glue layer 24, anti-tear glue layer 24 is located in the outer layer, can provide reliable anti-tear and wear function for the surface layer of thermistor, and heat conduction layer 21 and heat dissipation layer 22 close to resistance base layer 3 can provide effective heat dissipation effect for electrode foot end 1, and fire-resistant layer 23 is arranged on the outer side of heat dissipation layer 22, can reduce the burning spread of flame when electrode foot end 1 is on fire, and ensure the safe use of thermistor.

[0030] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A thermistor internal electrode structure, characterized by: It includes electrode foot end (1), resistance base layer (3) and cover surface layer (2), the electrode foot end (1) is embedded in the surface of the resistance base layer (3), the cover surface layer (2) is provided with two layers, two layers of the cover surface layer (2) are buckled and installed on the surface of the resistance base layer (3), the gap between adjacent resistance base layer (3) and cover surface layer (2) is filled with sealing green glue (4).

2. A thermistor inner electrode structure according to claim 1, characterized in that: The cover surface layer (2) includes heat conduction layer (21), heat dissipation layer (22), fire-resistant layer (23) and anti-tear glue layer (24).

3. A thermistor inner electrode structure according to claim 2, wherein: The heat conduction layer (21) is provided with graphite heat conduction material.

4. A thermistor inner electrode structure according to claim 2, wherein: The heat dissipation layer (22) is provided with three layers of composite copper foil.

5. A thermistor inner electrode structure according to claim 2, wherein: The fire-resistant layer (23) is composed of ceramic or high polymer composite material.

6. A thermistor inner electrode structure according to claim 1, wherein: The surface of the resistance base layer (3) is provided with heat insulation slot (31), and the surface of the resistance base layer (3) is also provided with heat conduction pad (32).

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