Ultrathin sheet type PTC (Positive Temperature Coefficient) thermistor

Abstract

The utility model relates to the technical field of thermistors, in particular to an ultrathin sheet type PTC (Positive Temperature Coefficient) thermistor which comprises a plurality of splicing units, and every two adjacent splicing units are fixedly connected through a T-shaped bonding piece; each splicing unit comprises a carrying disc, a PTC thermistor and an insulating spacer. According to the utility model, the carrying disc is used for carrying the PTC thermistor, the top of the carrying disc is provided with the groove shaped like the Chinese character'tian ', and the bottom of the carrying disc is provided with the longitudinal gap and the transverse gap, so that the carrying disc can be bent along the longitudinal gap and the transverse gap, and when the carrying disc is specifically used, a hot-surface resistor patch which is formed by splicing a plurality of splicing units and has a relatively large area has relatively good flexibility; therefore, the heating requirement of an object with a non-planar surface is met, and the heating device has a better use effect.

Description

Technical Field

[0001] The utility model relates to the technical field of thermistors, in particular to an ultra-thin sheet PTC thermistor. Background Art

[0002] PTC thermistor is a typical temperature-sensitive semiconductor resistor. When the temperature exceeds a certain level (Curie temperature), its resistance value increases in a step-like manner as the temperature rises, thus achieving the purpose of automatic temperature control and heating.

[0003] In some application scenarios of PTC thermistor patches, some non-planes may be heated, such as the side of a cylindrical shell, a large arc chamfer, a plate-shaped bend, etc. This requires the chip PTC thermistor to have good flexibility. For this purpose, the utility model designs an ultra-thin chip PTC thermistor. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and proposes an ultra-thin chip type PTC thermistor.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The ultra-thin chip PTC thermistor is characterized by comprising:

[0007] A plurality of splicing units, wherein two adjacent splicing units are fixedly connected by a T-shaped adhesive member;

[0008] Each of the splicing units comprises:

[0009] A carrier plate, wherein a top of the carrier plate forms a field-shaped groove;

[0010] A PTC thermistor, wherein the PTC thermistor is fixed inside the field groove, and a second electrode plate of the PTC thermistor is electrically connected to the carrier;

[0011] An insulating spacer, wherein the insulating spacer is fixedly connected to the top of the carrier plate, and the insulating spacer covers the PTC thermistor;

[0012] A transverse gap and a longitudinal gap are formed at the bottom of the carrier plate;

[0013] A first terminal is arranged on the top of the PTC thermistor, and a through hole is opened on the top of the insulating spacer at a position corresponding to the first terminal.

[0014] As a further description of the above technical solution:

[0015] The bottom of the carrier is fixedly connected with a heat conducting plate, and the space between the heat conducting plate and the bottom of the carrier is filled with heat conducting silica gel.

[0016] As a further description of the above technical solution:

[0017] A second extreme end is fixedly connected to the carrier plate of one of the splicing units.

[0018] As a further description of the above technical solution:

[0019] The first terminals of the PTC thermistors of all the splicing units are connected in parallel through a wiring harness.

[0020] As a further description of the above technical solution:

[0021] The horizontal portion of the T-shaped adhesive piece is located at the top of the splicing unit, and the vertical portion of the T-shaped adhesive piece is located between two adjacent splicing units.

[0022] As a further description of the above technical solution:

[0023] A metal strip is arranged inside the transverse gap or the longitudinal gap, and the cross section of the metal strip is circular.

[0024] As a further description of the above technical solution:

[0025] The horizontal part of the T-shaped adhesive piece is made of flexible material, the vertical part of the T-shaped adhesive piece is an aluminum plate, and the carrier plate is made of aluminum material.

[0026] The utility model has the following beneficial effects:

[0027] Compared with the prior art, the ultra-thin sheet PTC thermistor adopts a carrier plate to carry the PTC thermistor, the top of which is provided with a field-shaped groove, and the bottom forms a longitudinal gap and a transverse gap, so that the carrier plate can be bent along the longitudinal gap and the transverse gap. When used, a large-area hot surface resistor patch formed by splicing several splicing units has better flexibility, thereby meeting the demand for heating objects with non-planar surfaces and having a better use effect.

[0028] Compared with the prior art, the ultra-thin PTC thermistor uses a carrier plate to directly contact the second extreme terminal of the PTC thermistor, thereby reducing the steps of wiring the second extreme terminal, and has a better use effect in actual use; the ultra-thin PTC thermistor is formed by splicing a plurality of splicing units, so that it has better applicability when used in DIY. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A top view of the ultra-thin PTC thermistor proposed by the utility model;

[0030] Figure 2A three-dimensional view of the ultra-thin PTC thermistor proposed by the utility model;

[0031] Figure 3 This is an exploded view of the ultra-thin PTC thermistor proposed by the utility model;

[0032] Figure 4 The figure is a bottom view schematic diagram of the carrier plate of the ultra-thin PTC thermistor proposed by the present invention.

[0033] Legend:

[0034] 1. Splicing unit; 101. Heat conducting plate; 102. Carrier plate; 103. Field groove; 104. PTC thermistor; 105. First pole; 106. Insulating spacer; 107. Wire harness; 108. Second pole; 109. Longitudinal gap; 1010. Horizontal gap; 1011. Metal strip; 2. T-shaped adhesive. DETAILED DESCRIPTION

[0035] Reference Figure 1-Figure 4 The ultra-thin PTC thermistor provided by the utility model comprises: a plurality of splicing units 1, and two adjacent splicing units 1 are fixedly connected by a T-shaped adhesive member 2.

[0036] When in use, the number of splicing units 1 is reasonably set according to the area actually required to be heated, and then a plurality of splicing units 1 are connected to a surface area of ​​a predetermined shape and size by a T-shaped adhesive 2, thereby ensuring that it can adapt to various situations.

[0037] Each of the splicing units 1 includes a carrier plate 102 , a PTC thermistor 104 , and an insulating spacer 106 .

[0038] A 'T' groove 103 is formed at the top of the carrier 102, and a transverse gap 1010 and a longitudinal gap 109 are formed at the bottom of the carrier 102. The transverse gap 1010 and the longitudinal gap 109 are in a vertically intersecting state. The PTC thermistor 104 is fixed on the inner side of the 'T' groove 103, and the second electrode plate of the PTC thermistor 104 is electrically connected to the carrier 102.

[0039] Generally, the PTC thermistor 104 includes an upper aluminum plate, a lower aluminum plate, and a ceramic medium located between the upper aluminum plate and the lower aluminum plate. The upper aluminum plate and the lower aluminum plate serve as two poles of the PTC thermistor 104 , wherein the upper aluminum plate directly contacts the inner bottom of the carrier 102 and is electrically connected to the carrier 102 .

[0040] The insulating spacer 106 is fixedly connected to the top of the carrier 102, and the insulating spacer 106 covers the PTC thermistor 104, and a first pole 105 is arranged on the top of the PTC thermistor 104, and a through hole is opened at the top of the insulating spacer 106 and at a position corresponding to the first pole 105, and the first pole 105 exposed from the through hole is convenient for wiring.

[0041] In one embodiment, a heat conducting plate 101 is fixedly connected to the bottom of the carrier 102, and thermally conductive silicone is filled between the heat conducting plate 101 and the bottom of the carrier 102. The heat conducting plate 101 can be made of a metal plate. The thermally conductive silicone makes the heat conducting plate 101 and the bottom of the carrier 102 contact more closely, especially at the positions corresponding to the horizontal gap 1010 and the vertical gap 109, so that better thermal conductivity can be formed between the heat conducting plate 101 and the carrier 102.

[0042] In one embodiment, a second extreme pole 108 is fixedly connected to the carrier plate 102 of one of the splicing units 1, the horizontal portion of the T-shaped adhesive member 2 is a flexible material, the vertical portion of the T-shaped adhesive member 2 is an aluminum plate, and the carrier plate 102 is made of aluminum, so that all the carrier plates 102 are conductive. As long as the second extreme pole 108 is fixedly connected to the carrier plate 102 of one of the splicing units 1, all the carrier plates 102 in the ultra-thin PTC thermistor can be electrically connected to the second extreme pole 108.

[0043] In one embodiment, the first poles 105 on the PTC thermistors 104 of all the splicing units 1 are connected in parallel via a wiring harness 107 , and the wiring harness 107 is a joint after the first poles 105 of the PTC thermistors 104 of all the splicing units 1 are connected in parallel.

[0044] In one embodiment, the horizontal portion of the T-shaped adhesive 2 is located at the top of the splicing unit 1, and the vertical portion of the T-shaped adhesive 2 is located between two adjacent splicing units 1, so that neither the vertical portion nor the horizontal portion of the T-shaped adhesive 2 affects the flexible relative rotation (slight movement) between the two adjacent splicing units 1.

[0045] In one embodiment, a metal strip 1011 is disposed inside the transverse gap 1010 or the longitudinal gap 109 , and the cross section of the metal strip 1011 is circular.

[0046] In the direction in which the metal strip 1011 is arranged, the thin-film PTC thermistor has a certain bending strength by relying on the bending resistance of the metal strip 1011 along the length direction.

[0047] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Ultra-thin chip PTC thermistor, characterized in that: include: A plurality of splicing units (1), wherein two adjacent splicing units (1) are fixedly connected via a T-shaped adhesive member (2); Each of the splicing units (1) comprises: A carrier plate (102), wherein a top of the carrier plate (102) is formed with a field-shaped groove (103); A PTC thermistor (104), wherein the PTC thermistor (104) is fixed on the inner side of the square groove (103), and a second electrode plate of the PTC thermistor (104) is electrically connected to the carrier disk (102); An insulating spacer (106), wherein the insulating spacer (106) is fixedly connected to the top of the carrier plate (102), and the insulating spacer (106) covers the PTC thermistor (104); The bottom of the carrier plate (102) is formed with a transverse gap (1010) and a longitudinal gap (109); A first terminal end (105) is provided on the top of the PTC thermistor (104), and a through hole is provided on the top of the insulating spacer (106) at a position corresponding to the first terminal end (105).

2. The ultra-thin PTC thermistor according to claim 1, characterized in that: The bottom of the carrier plate (102) is fixedly connected to a heat conducting plate (101), and heat conducting silica gel is filled between the heat conducting plate (101) and the bottom of the carrier plate (102).

3. The ultra-thin PTC thermistor according to claim 1, characterized in that: A second extreme end (108) is fixedly connected to the carrier plate (102) of one of the splicing units (1).

4. The ultra-thin PTC thermistor according to claim 1, characterized in that: The first terminals (105) on the PTC thermistors (104) of all the splicing units (1) are connected in parallel via a wiring harness (107).

5. The ultra-thin PTC thermistor according to claim 1, characterized in that: The horizontal portion of the T-shaped adhesive member (2) is located at the top of the splicing unit (1), and the vertical portion of the T-shaped adhesive member (2) is located between two adjacent splicing units (1).

6. The ultra-thin PTC thermistor according to claim 1, characterized in that: A metal strip (1011) is provided inside the transverse slit (1010) or the longitudinal slit (109), and the cross section of the metal strip (1011) is circular.

7. The ultra-thin PTC thermistor according to claim 1, characterized in that: The horizontal portion of the T-shaped adhesive member (2) is made of a flexible material, the vertical portion of the T-shaped adhesive member (2) is an aluminum plate, and the carrier plate (102) is made of aluminum.

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