CN210378639U

CN210378639U - PPTC overcurrent protection element

Info

Publication number: CN210378639U
Application number: CN201921240836.3U
Authority: CN
Inventors: 刘邦超
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-08-02
Filing date: 2019-08-02
Publication date: 2020-04-21
Anticipated expiration: 2029-08-02

Abstract

The utility model discloses a PPTC overcurrent protection element, including the PPTC resistance chip, the upper surface right side of PPTC resistance chip and the lower surface left side of PPTC resistance chip have the cusp lug that distributes respectively along the horizontal direction, the upper surface left side sticky fixation of PPTC resistance chip has last conductive film, the lower surface right side sticky fixation of PPTC resistance chip has lower conductive film, the outside of going up conductive film, lower conductive film scribbles the insulating layer, the outside of insulating layer is equipped with insulating rubber, be equipped with the spring between insulating layer and the insulating rubber, the left and right sides of PPTC resistance chip is equipped with the electrode slice respectively, and the electrode slice that is located left is left electrode slice, and the electrode slice that is located right side is right electrode slice; the upper end of the electrode plate is bent to form an upper attaching part; this device simple structure can prevent effectively that pptc from thinking because of the too big phenomenon of being punctured of electric current, has increased overcurrent protection and has thought, and this device shock attenuation is effectual simultaneously.

Description

PPTC overcurrent protection element

Technical Field

The utility model belongs to the technical field of the overcurrent protection and specifically relates to a PPTC overcurrent protection element.

Background

A polymeric PTC overcurrent protection device, PPTC, is an element that makes and breaks a circuit by using the resistance positive temperature characteristic of a conductive polymer whose conductivity changes due to thermal expansion. The conductive material with positive temperature characteristic is generally made by filling crystalline polyolefin with a conductive medium. The resistance of the PPTC device is basically kept constant in a normal state, when a circuit fault causes a large current to pass through the PPTC device, the PPTC generates heat by itself according to the Joule law, and when the internal temperature of the PPTC rises to be close to a critical transition temperature, the PPTC resistance suddenly increases, and the transition of several orders of magnitude occurs, so that the current in the circuit is limited to pass, and equipment is protected from being damaged. And when the fault is eliminated, the temperature of the PPTC device is reduced, and the resistance value of the PPTC device is restored to a low-resistance state.

The PPTC device has good self-recovery property, so that the PPTC device is widely applied to the fields of point adding, computers, communication, consumer electronics, toys, automobile micro-motors and the like. With the increase of the integration level of communication equipment, the density of elements is also increased continuously, so that the smaller the size of the element is, the better the element is, when the size of the PPTC thermistor is reduced, when a fault occurs in a circuit, a creepage phenomenon easily occurs on the surface of a PPTC core material due to a larger fault voltage, and the PPTC thermistor is subjected to breakdown, combustion and other phenomena, so as to cause a safety accident, and meanwhile, the current PPTC thermistor is vibrated when expanded, and the existing connection mode cannot achieve a good damping effect.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an it is not enough to overcome above-mentioned condition, aims at providing the technical scheme that can solve above-mentioned problem.

A PPTC overcurrent protection element comprises a PPTC resistor chip, wherein tooth-shaped lugs are respectively distributed on the right side of the upper surface of the PPTC resistor chip and the left side of the lower surface of the PPTC resistor chip along the horizontal direction, grooves are formed between adjacent lugs, the grooves formed between the lugs simultaneously increase creepage distance, reduce creepage probability, and reduce the phenomenon that the PPTC overcurrent protection element breaks down when working under high voltage, an upper conductive film is fixedly adhered on the left side of the upper surface of the PPTC resistor chip, a lower conductive film is fixedly adhered on the right side of the lower surface of the PPTC resistor chip, insulating layers are coated on the outer sides of the upper conductive film and the lower conductive film, insulating rubber is arranged on the outer sides of the insulating layers, springs are arranged between the insulating layers and the insulating rubber, two ends of each spring are respectively connected and fixed with the insulating rubber, and electrode plates are respectively arranged on the left side and the right side of, the electrode plate on the left side is a left electrode plate, and the electrode plate on the right side is a right electrode plate; the upper end of the electrode plate is bent to form an upper attaching part, the upper attaching part of the right electrode plate is attached to the upper end face of the insulating rubber, the right electrode plate is connected with the right end face of the upper conductive film, the lower end of the electrode plate is bent to form a lower attaching part, the lower attaching part of the left electrode plate is attached to the lower end face of the insulating rubber, the left electrode plate is connected with the left end face of the lower conductive film, and when the electrode plate works, current can flow in from the left electrode plate, flow through the lower conductive film, then flow through the PPTC resistance chip, and then flow to the right electrode plate through the upper conductive film to form a conducting passage; of course, the current can also flow in from the right electrode plate and flow out from the left electrode plate to form a current channel.

As a further aspect of the present invention: the insulating layer is made of epoxy resin insulating packaging material.

As a further aspect of the present invention: the electrode plate is a copper sheet.

The utility model has the advantages that: through lug and recess can prevent effectively that pptc from wanting too much because of the phenomenon that is punctured of electric current, increased overcurrent protection, make this device shock attenuation effectual simultaneously through damping spring.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be 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 some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a plan view of the present invention.

In the figure: 1-PPTC resistor chip, 11-bump, 12-groove, 2-upper conductive film, 3-lower conductive film, 4-insulating layer, 5-insulating rubber, 6-spring and 7-electrode plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-2, in an embodiment of the present invention, a PPTC over-current protection element includes a PPTC resistor chip 1, tooth-shaped bumps 11 are respectively distributed on a right side of an upper surface of the PPTC resistor chip 1 and a left side of a lower surface of the PPTC resistor chip 1 along a horizontal direction, a groove 12 is formed between adjacent bumps 11, the groove 12 formed between the bumps 11 increases a creepage distance, reduces a probability of creepage, and reduces a phenomenon of breakdown of the PPTC over-current protection element when operating under a high voltage, an upper conductive film 2 is adhesively fixed on the left side of the upper surface of the PPTC resistor chip 1, a lower conductive film 3 is adhesively fixed on the right side of the lower surface of the PPTC resistor chip 1, an insulating layer 4 is coated on an outer side of the upper conductive film 2 and the lower conductive film 3, an insulating rubber 5 is disposed on an outer side of the insulating layer 4, a spring 6 is disposed between the insulating, two ends of a spring 6 are respectively connected and fixed with an insulating layer 4 and an insulating rubber 5, the left side and the right side of the PPTC resistor chip 1 are respectively provided with an electrode plate 7, the electrode plate 7 positioned on the left side is a left electrode plate, and the electrode plate positioned on the right side is a right electrode plate; the upper end of the electrode plate 7 is bent to form an upper attaching portion, the upper attaching portion of the right electrode plate is attached to the upper end face of the insulating rubber 5, the right electrode plate is connected with the right end face of the upper conductive film 2, the lower end of the electrode plate 7 is bent to form a lower attaching portion, the lower attaching portion of the left electrode plate is attached to the lower end face of the insulating rubber 5, the left electrode plate is connected with the left end face of the lower conductive film 3, and when the electrode plate works, current can flow in from the left electrode plate, flow through the lower conductive film 3, then flow through the PPTC resistor chip 1, and then flow through the upper conductive film 2 to the right electrode plate to form a conducting path; of course, the current can also flow in from the right electrode plate and flow out from the left electrode plate to form a current channel.

The insulating layer 4 is made of epoxy resin insulating packaging material.

The electrode plate 7 is a copper sheet.

The utility model discloses a theory of operation is: the current can flow in from the left electrode slice, flows through the lower conductive film 3, then flows through the PPTC resistance chip 1, and then flows to the right electrode slice through the upper conductive film 2 to form a conductive path; certainly, current can also flow in from the right electrode slice and flow out from the left electrode slice to form a current channel, when the current is overloaded, the grooves 12 formed between the lugs 11 simultaneously increase the creepage distance, reduce the probability of creepage, reduce the phenomenon that the PPTC overcurrent protection element breaks down when working under high voltage, generate vibration when the PPTC resistor chip 1 works, and the spring 6 can play a good role in shock absorption.

It will be apparent to those skilled in the art that the present invention is not limited to +of the above exemplary embodiments

The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. A PPTC overcurrent protection element comprises a PPTC resistor chip and is characterized in that tooth-shaped lugs are respectively distributed on the right side of the upper surface of the PPTC resistor chip and the left side of the lower surface of the PPTC resistor chip along the horizontal direction, a groove is formed between every two adjacent lugs, an upper conductive film is fixedly adhered on the left side of the upper surface of the PPTC resistor chip, a lower conductive film is fixedly adhered on the right side of the lower surface of the PPTC resistor chip, insulating layers are coated on the outer sides of the upper conductive film and the lower conductive film, insulating rubber is arranged on the outer sides of the insulating layers, a spring is arranged between each insulating layer and the corresponding insulating rubber, two ends of each spring are respectively connected and fixed with the corresponding insulating layer and the corresponding insulating rubber, electrode plates are respectively arranged on the left side and the right side of the PPTC resistor chip; the upper end of the electrode plate is bent to form an upper attaching portion, the upper attaching portion of the right electrode plate is attached to the upper end face of the insulating rubber, the right electrode plate is connected with the right end face of the upper conductive film, the lower end of the electrode plate is bent to form a lower attaching portion, the lower attaching portion of the left electrode plate is attached to the lower end face of the insulating rubber, and the left electrode plate is connected with the left end face of the lower conductive film.

2. The PPTC overcurrent protection element as recited in claim 1, wherein said insulating layer material is an epoxy insulating encapsulant.

3. The PPTC overcurrent protection element of claim 1, wherein said electrode sheet is a copper sheet.