JP4740005B2 - Surface temperature detector - Google Patents

Description

  The present invention relates to a planar temperature detector that can be conducted by being partially exposed to an abnormally high temperature and can detect an abnormal temperature. In particular, since it is thin and excellent in flexibility, it can detect various shapes. Further, the present invention relates to a device having excellent operational reliability.

  Conventionally, elemental temperature fuses and thermistors have been used as safety devices to detect abnormal temperatures in thermal equipment, lithium secondary batteries, etc., and there are a wide range of places where abnormal temperatures may occur. In order to improve safety, a plurality of thermal fuses and thermistors are used in combination. However, in such a configuration, there is a problem that a portion that detects an abnormal temperature is a point, and it is not certain whether it acts reliably on an abnormal temperature that occurs locally. Further, since the amount of use of the thermal fuse and thermistor increases, there is a problem that not only the part cost increases, but also the connecting process takes a lot of man-hours, so that the operation cost becomes very high.

  Conventionally, various planar thermal fuses are known as solutions for such problems. For example, as in Patent Document 1, a thermoplastic resin film is interposed between a film sheet-like flat electrode and a film-like heat detection electrode in which unevenness or a plurality of holes are formed, and these are polyethylene terephthalate films. What was covered with is mentioned. In Patent Document 1, when an abnormally high temperature occurs, the thermoplastic resin film melts and flows into the concave and convex recesses or the plurality of holes formed on the surface of the heat detection electrode, and the heat detection electrode and the planar electrode come into contact with each other. By detecting the abnormal temperature, the abnormal temperature is detected.

  Further, as in Patent Document 2, there is a configuration in which two plate-like electrode plates face each other, and an electrically insulating substance that melts at a temperature equal to or higher than a predetermined value is sandwiched between the two plate electrode plates. In this patent document 2, an electrically insulating substance is melted by overheating, both electrode plates are brought into contact, and are electrically connected to detect an abnormality.

JP-A-6-229839 JP-A-9-145164

  Here, in the case of the planar thermal fuse disclosed in Patent Document 1, unless a sufficient depth is provided in the concave portion or the hole portion of the heat detection electrode, the thermoplastic resin film is not formed between the heat detection electrode and the planar electrode. A part remains, and the heat detection electrode and the planar electrode cannot be reliably brought into contact with each other. However, if the recess or hole of the heat detection electrode has a sufficient depth, the thickness of the heat detection electrode increases and flexibility as a planar temperature fuse cannot be obtained.

In addition, the planar thermal fuse disclosed in Patent Document 2 does not have a space for the molten electrically insulating material to move, and therefore remains between the two electrode plates in a molten state. It may be impossible to plan. Further, this Patent Document 2 discloses the use of a material in which solder particles are mixed in a flux as an electrically insulating material. As a result, when the temperature is abnormal, the flux melts and disappears, and the solder particles overlap or fuse to provide a bridge between the two electrode plates. However, in this case, it is considered that the melted solder becomes a small sphere at the time of detection due to the effect of the flux and is separated, and the two electrode plates cannot conduct. In addition, when used in a high temperature environment for a long time, the flux may be dissipated due to thermal deterioration. In this case, even if the temperature does not reach the abnormal temperature, the two electrode plates become conductive and malfunction. become.

  The present invention has been made on the basis of such points, and the object of the present invention is to be conductive by being exposed to even a part of an abnormally high temperature, to detect the abnormal temperature, and to be thin and flexible. Therefore, it is desirable to provide a surface temperature detector that can be mounted on detection objects of various shapes and that has excellent operational reliability.

In order to achieve the above object, a planar temperature detector according to claim 1 of the present invention is a planar substrate, a first electrode disposed on the substrate, and a first electrode disposed on the first electrode. A planar temperature detector comprising: a second electrode; and a spacer arranged to insulate the first electrode from the second electrode. The spacer is melted at a predetermined temperature. In addition, the molten spacer moves to the base material.
The planar temperature detector according to claim 2 of the present invention is characterized in that the base material absorbs the molten spacer.
The planar temperature detector according to claim 3 of the present invention is characterized in that the first electrode is made of a linear conductor.
The planar temperature detector according to claim 4 of the present invention is characterized in that the second electrode is made of a linear conductor.
The planar temperature detector according to claim 5 of the present invention is characterized in that the second electrode is composed of a planar conductor.
The planar temperature detector according to claim 6 of the present invention is characterized in that the first electrode and the second electrode are twisted together.
According to a seventh aspect of the present invention, there is provided a planar temperature detector, wherein the spacer is coated on the outer circumference of the first electrode or the second electrode.
The planar temperature detector according to claim 8 of the present invention is characterized in that the first electrode and the second electrode are arranged so as to be substantially orthogonal to each other.
The planar temperature detector according to claim 9 of the present invention is characterized in that the first electrode or the second electrode is a sensor wire in which a temperature detection wire is wound around an outer periphery of a tensile strength wire. Is.
The planar temperature detector according to claim 10 of the present invention is characterized in that the first electrode or the second electrode has a heater function.

According to the present invention, since the melted spacer moves to the base material, the first electrode and the second electrode are reliably in contact with each other and are electrically connected to the abnormal temperature that occurs locally. It is possible to reliably detect, and safety can be improved. Further, the temperature to be detected can be freely set by appropriately selecting spacers having various melting points. Further, since the thickness of the electrode is not increased, the surface temperature detector can be thin and excellent in flexibility, and can be mounted on detection objects of various shapes.
In particular, as in claim 2, if the base material absorbs the melted spacer, the spacer is reliably removed from between the first electrode and the second electrode when the abnormal temperature is detected, Conduction can be achieved.
According to the third aspect of the present invention, the flexibility of the planar temperature detector can be further improved by making the first electrode linear. In addition, when the molten spacer moves to the base material, the first electrode does not interfere with this movement at all. Without obstructing, it is possible to reliably detect an abnormal temperature.
According to the fourth aspect of the present invention, the flexibility of the planar temperature detector can be further improved by making the second electrode linear. In addition, since the upper surface of the spacer is not completely covered and a space for the molten spacer to move can be provided, the molten spacer accumulates between the first electrode and the second electrode and becomes conductive. Therefore, it is possible to reliably detect an abnormal temperature.
Further, according to claim 5 , since the first electrode or the second electrode and the spacer can be handled as a single linear body, handling at the time of manufacture and arrangement on the base material are facilitated, and production Can be improved. Further, since the spacer completely covers the first electrode or the second electrode, conduction in a state where the abnormal temperature is not reached, that is, malfunction can be surely prevented.
Further, according to claim 6 , if the first electric wire and / or the second electric wire is made of a material having spring properties such as hard steel wire, piano wire, oil temper wire, stainless steel wire, etc., the spacer After 2 melts, the first electrode 11 and the second electrode 12 can be reliably brought into contact by the restoring force.
According to the seventh aspect of the present invention , it is possible to easily assemble without requiring frequent wiring, so that productivity can be improved. Further, since the contact point between the first electrode and the second electrode can be increased at the time of detecting the abnormal temperature, it is possible to detect even a partial abnormal temperature in a smaller range.
Further, according to the eighth aspect, since the first electrode and the second electrode are arranged so as to cross each other, the first electrode and the second electrode are easily brought into contact with each other. Operation reliability can be obtained.
According to the ninth aspect, the temperature of the entire planar temperature detector can be detected by using the first electrode or the second electrode as a sensor line.
According to the tenth aspect, since the first electrode or the second electrode has a heater function, it can have both a heating function and a temperature detection function.

  The first embodiment of the present invention will be described below with reference to the drawings.

  As shown in FIG.1 and FIG.2, on the base material 1 which consists of a mesh cloth of glass fiber, the 1st electrode 11 which consists of a copper twisted wire is arrange | positioned so that a serpentine shape may be formed. Ni wire is wound on the outer periphery of the Kevlar core on the first electrode 11 via a sheet-like spacer 2 made of a mixture of hot melt adhesive (melting point 85 ° C.) and solid wax (melting point 85 ° C.). The rotated second electrode 12 is disposed so as to form a meandering shape that is substantially orthogonal to the first electrode 11. Further, a film 3 made of polyethylene terephthalate (PET) is stuck on the second electrode 12 with an adhesive to protect the second electrode 12. Thus, the planar temperature detector 10 according to the first embodiment is configured.

  The planar temperature detector 10 thus obtained was heated at 1 ° C./min in the heating tank while the second electrode 12 was energized, and the temperature at which the first electrode 11 was energized was measured. The operating temperature was measured. The number of samples was 4. As a result, it was confirmed that any sample was operating at 85 to 90 ° C., and it was possible to reliably detect an abnormal temperature.

  According to the first embodiment, when even a part of the surface temperature detector becomes an abnormal temperature, the spacer 2 is melted, and the melted spacer 2 is absorbed by the base material 1, thereby Since it moves to the material 1, the 1st electrode 11 and the 2nd electrode 12 contact and conduct | electrically_connect, and it can detect abnormal temperature reliably. Further, since the substrate 1, the spacer 2, the first electrode 11, the second electrode 12, and the film 3 are all thin and excellent in flexibility, the entire planar temperature detector 10 is provided. However, it can be made thin and excellent in flexibility.

  Further, since the first electrode is linear, the melted spacer moves immediately to the base material 1 without being blocked by the first electrode. In this way, since the first electrode does not hinder the movement of the molten spacer, the molten spacer does not accumulate between the first electrode and the second electrode and prevents conduction, resulting in an abnormal temperature. On the other hand, it is possible to detect with certainty.

  Further, since the second electrode 12 is also linear, a space is provided on the side of the second electrode 12. When the spacer 2 that has insulated the first electrode 11 and the second electrode 12 is melted, the spacer 2 is provided on the side of the second electrode 12 when moving to the substrate 1. Since the space is utilized and moves smoothly, the molten spacer can be reliably detected against abnormal temperatures without accumulating between the first electrode and the second electrode and preventing conduction. It is.

  In addition, since the first electrode 11 and the second electrode 12 are arranged so as to be substantially perpendicular to each other, the first electrode 11 and the second electrode 12 are easily brought into contact with each other. Sex can be obtained.

  Further, since the second electrode 12 is a sensor wire in which a temperature detection wire (Ni wire) is wound around the outer periphery of the tensile body (Kevlar core), at an abnormal temperature or lower, that is, at a temperature lower than the melting temperature of the spacer 2, By detecting the potential difference between the temperature detection lines, the temperature of the entire planar temperature detection body can be detected.

  Hereinafter, a second embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG.3 and FIG.4, the 1st electrode 11 which consists of a copper twisted wire is arrange | positioned linearly on the base material 1 which consists of a nonwoven fabric of PET, The outer periphery of this 1st electrode 11 The spacer 2 made of a mixture of hot melt adhesive (melting point 85 ° C.) and solid wax (melting point 85 ° C.) is extrusion coated. A second electrode 12 made of an aluminum foil is disposed on the spacer 2 (first electrode 11). Further, on the second electrode 12, a film 3 made of PET having an adhesive article coated on one side is attached to protect the second electrode 12. Thus, the planar temperature detector 10 according to the second embodiment is configured.

  The planar temperature detector 10 thus obtained was heated at 1 ° C./min in the heating tank while the second electrode 12 was energized, and the temperature at which the first electrode 11 was energized was measured. The operating temperature was measured. The number of samples was 5. As a result, it was confirmed that any sample was operating at 85 to 90 ° C., and it was possible to reliably detect an abnormal temperature.

  According to the second embodiment, when even a part of the surface temperature detector becomes an abnormal temperature, the spacer 2 is melted, and the melted spacer 2 is absorbed by the base material 1 so that Since it moves to the material 1, the 1st electrode 11 and the 2nd electrode 12 contact and conduct | electrically_connect, and it can detect abnormal temperature reliably. Further, since the substrate 1, the spacer 2, the first electrode 11, the second electrode 12, and the film 3 are all thin and excellent in flexibility, the entire planar temperature detector 10 is provided. However, it can be made thin and excellent in flexibility.

  Further, since the first electrode is linear, the melted spacer moves immediately to the base material 1 without being blocked by the first electrode. In this way, since the first electrode does not hinder the movement of the spacer at all, the melted spacer does not accumulate between the first electrode and the second electrode and does not hinder continuity, and withstands abnormal temperatures. It is possible to detect with certainty.

  In addition, since the second electrode 12 has a planar shape, the contact point between the first electrode and the second electrode at the time of abnormal temperature detection can be increased, so that a partial abnormal temperature in a smaller range can be obtained. In this case, it is possible to detect.

  In addition, since the outer periphery of the first electrode 11 is coated with the spacer 2, the first electrode 11 and the spacer 2 can be handled as a single linear body. Can be easily arranged, and productivity can be improved. Further, since the spacer 2 completely covers the first electrode 11, conduction in a state where the abnormal temperature has not been reached, that is, malfunction can be reliably prevented.

  The planar temperature detector according to the present invention is not limited to the above embodiment. First, it is sufficient that the base material 1 has such a shape and configuration that the molten spacer 2 can move, that is, can flow. For example, although a sheet provided with unevenness or a hole or a net made of various linear materials can be considered, it is particularly preferable that the melted spacer 2 can be absorbed. Examples of the base material 1 that can absorb such a melted spacer 2 include not only the mesh cloth and the nonwoven fabric described in the above embodiment, but also a sponge, a woven fabric, paper, and the like. In addition, there is no limitation in particular about the material which comprises the base material 1. FIG.

  Next, the first electrode 11 may be a conductor, and the material is not limited, for example, iron, copper, aluminum, or an alloy thereof. Further, the shape is not particularly limited as long as it does not prevent the molten spacer 2 from moving to the base material 1. For example, a linear shape such as a single wire or a twisted wire, Examples include so-called strips having a width, and it is conceivable to arrange these on the substrate 1 in various shapes such as a meandering shape and a linear shape. At this time, the first electrode 11 may be composed of a plurality of conductors instead of a single conductor. For example, a plurality of linear conductors are formed in a net shape, One electrode 11 may be used. In addition to a linear or belt-like one, for example, a foil-like conductor having predetermined holes or cuts may be used. Examples of such a foil-like first electrode 11 include aluminum foil, copper foil, copper-PET film, and the like. good. Moreover, like the above-mentioned 2nd electrode 12, it is good also considering the 1st electrode 11 as a sensor wire which wound the temperature detection wire around the outer periphery of the tension body.

Next, in the first embodiment, the second electrode 12 is a sensor wire in which a temperature detection wire is wound around the outer circumference of the tensile strength body. For example, iron, copper, aluminum, or an alloy thereof is used. It may be a linear one such as a single wire or a twisted one, or a so-called belt-like one having a predetermined width. Further, the second electrode 12 may not be linear, and may be constituted by, for example, a foil or a plurality of linear conductors formed in a net shape. In this case, when the second electrode 12 is disposed, it is possible to easily assemble without requiring frequent wiring, and thus productivity can be improved. Examples of the foil-like second electrode 12 include an aluminum foil, a copper foil, a copper-PET film, and the like, and those having a thickness that does not decrease the flexibility may be appropriately selected and used. .

  If the second electrode 12 is formed in a strip shape or a foil shape, the contact point with the first electrode 11 can be increased as described above. However, in the terminal processing when the electrode is connected to a lead wire or the like, the linear electrode is superior in workability. Therefore, as shown in FIG.5 and FIG.6, the contact point of the 1st electrode 11 and the 2nd electrode 12 is obtained by using together the strip | belt-shaped 2nd electrode 12a and the linear 2nd electrode 12b. And the workability of terminal processing can be improved.

  Next, in the first embodiment, the first electrode 11 is arranged so as to form a meandering shape, and the second electrode 12 is formed so as to form a meandering shape substantially orthogonal to the first electrode 11. However, there is no particular limitation regarding the arrangement of the first electrode 11 and the second electrode 12. In short, it is sufficient that the first electrode 11 and the second electrode 12 intersect each other via the spacer 2 at at least one place. As another form, for example, as shown in FIG. 7, a form in which the first electrode 11 and the second electrode 12 covered with the spacer 2 are twisted together is also conceivable. In such a configuration, if the first electrode 11 and / or the second electrode 12 is made of a material having spring properties such as a hard steel wire, a piano wire, an oil temper wire, a stainless steel wire, the spacer After 2 melts, the first electrode 11 and the second electrode 12 are surely brought into contact by the restoring force, which is preferable. Such an effect can also be obtained when the first electrode 11 and / or the second electrode 12 is made of a shape memory alloy having a phase transformation temperature near the melting temperature of the spacer. The twisting here is not limited to the form shown in FIG. 7, for example, the form in which the second electrode 12 is wound horizontally on the outer periphery of the first electrode 11, or the outer periphery of the second electrode 12. A form in which the first electrode 11 is wound horizontally is also included.

  When the first electrode 11 covered with the spacer 2 and the second electrode 12 are twisted together, as shown in FIGS. 8 and 9, the first electrode 11 covered with the spacer 2 and the second electrode The braid 21 and the horizontal winding 22 which consist of various fiber materials, a metal fine wire, etc. may be given to the outer periphery which twisted together the electrode 12 of this. Accordingly, a space can be provided around the first electrode 11 and the second electrode 12 covered with the spacer 2, so that the molten spacer 2 is easily moved to the base material 1. Further, if the braid 21 and the horizontal winding 22 are made of a conductive material such as a thin metal wire, the braid 21 and the horizontal winding 22 can also function in the same manner as the second electrode.

  Next, the spacer 2 is not particularly limited as long as it has flexibility and melts at a predetermined temperature. Examples of materials include thermoplastic resins such as polyethylene resins and ethylene-vinyl acetate copolymer resins, thermoplastic elastomers such as olefin elastomers, organic salts, natural waxes such as plant-based, animal-based, ore-based, paraffin, Examples include petroleum waxes such as micro wax and petratum wax, synthetic waxes such as wax products, resin products, and asphalt products, fatty acids, fatty acid salts, etc., with melting points that match the temperature detected from these. May be selected as appropriate. Moreover, in order to lower the viscosity at the time of melting and to make it easy to move to the substrate 1, a liquid material such as oil or a liquid polymer may be mixed. In the first embodiment, the sheet-like spacer 2 is used, and in the second embodiment, the first electrode 11 is covered with the spacer 2. However, the shape of the spacer is not limited. For example, the second electrode 12 may be covered with the spacer 2. The point is that the first electrode 11 and the second electrode 12 are insulated by the spacer 2 at a temperature equal to or lower than the abnormal temperature.

  Moreover, in this Embodiment, although the film 3 was stuck on the 2nd electrode 12, if the protection of the 2nd electrode 12 is not required, the film 3 does not need to stick especially. Further, if the film 3 is a heat shrinkable film, the film 3 contracts when an abnormal temperature is detected, so that the first electrode 11 and the second electrode 12 can be brought into contact with each other more reliably.

  Further, the first electrode 11 or the second electrode 12 may have a heater function. Thereby, it can have a heating function and a temperature detection function. As a specific aspect, for example, it can be considered that either the first electrode 11 or the second electrode 12 is a heater wire. At this time, if the other electrode is the above-described sensor wire, heating can be performed with the heater wire while controlling the temperature with the sensor wire in the normal state. Therefore, energization can be cut off by detecting a potential difference that varies greatly. Examples of the heater wire include a resistance wire such as a nichrome wire and a Kanthal wire, and those wound around an outer periphery of a tensile body such as a Kevlar core. As another aspect, a combination of the above-described sensor wire and heater wire may be considered. For example, the outer periphery of the sensor wire is covered with an insulator, and a resistance wire is wound around the outer periphery. For example, the outer periphery is coated with an insulator and a temperature detection wire is wound around the outer periphery, and the resistance wire and the temperature detection wire are wound around the outer periphery of the tensile body so as not to contact each other.

  In addition to the first electrode 11 and the second electrode 12, a heater wire may be provided. For example, in the embodiment shown in FIGS. 1 and 2, heater wires may be arranged on the upper surface of the film 3 or the lower surface of the substrate 1 so as to form a meandering shape. If the first electrode 11 and the second electrode 12 are insulated from each other at an abnormal temperature or lower, a heater wire is disposed between the first electrode 11 and the second electrode 12. Also good.

  As described in detail above, the present invention relates to a planar temperature detector that is electrically conductive by being partially exposed to an abnormally high temperature and can detect an abnormal temperature. Therefore, it is possible to obtain a planar temperature detector having excellent operational reliability. In addition, for example, secondary batteries, water heaters, refrigerators, air conditioner indoor and outdoor units, clothes dryers, jar rice cookers, hot plates, coffee makers, water heaters, ceramic heaters, petroleum heaters, vending machines, It can be used for heating futons, floor heating panel heaters, copiers, facsimiles, tableware dryers, fryer.

It is a figure which shows the 1st Embodiment of this invention, and is a partially notched perspective view of a planar temperature detection body. It is a figure which shows the 1st Embodiment of this invention and is a disassembled perspective view of a planar temperature detection body. It is a figure which shows the 2nd Embodiment of this invention, and is a partially notched perspective view of a planar temperature detection body. It is a figure which shows the 2nd Embodiment of this invention, and is a disassembled perspective view of a planar temperature detection body. It is a figure which shows other embodiment of this invention, and is a partially notched perspective view of a planar temperature detection body. It is a figure which shows other embodiment of this invention, and is a disassembled perspective view of a planar temperature detection body. It is a figure which shows other embodiment of this invention, and is a partially notched perspective view of a planar temperature detection body. It is a figure which shows other embodiment of this invention, and is the partially notched perspective view which expanded the principal part of the planar temperature detection body. It is a figure which shows other embodiment of this invention, and is the partially notched perspective view which expanded the principal part of the planar temperature detection body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base material 2 Spacer 3 Film 10 Planar temperature detector 11 1st electrode 12 2nd electrode

Claims (10)

A planar substrate, a first electrode disposed on the substrate, a second electrode disposed on the first electrode, the first electrode and the second electrode A surface temperature detector comprising spacers arranged to be insulated, wherein the spacer melts at a predetermined temperature, and the melted spacer moves to a substrate. Temperature detector. The planar temperature detector according to claim 1, wherein the base material absorbs the melted spacer. The planar temperature detector according to claim 2, wherein the first electrode is made of a linear conductor. The planar temperature detector according to claim 3, wherein the second electrode is made of a linear conductor. The planar temperature detector according to claim 3 or 4, wherein the spacer is coated on an outer periphery of the first electrode or the second electrode. A planar substrate, a first electrode and a second electrode disposed on the substrate, and a spacer disposed to insulate the first electrode from the second electrode. The first temperature electrode and the second electrode are made of a linear conductor, and the outer periphery of the first electrode or the second electrode is covered with the spacer. The first electrode and the second electrode are twisted together, and the spacer melts at a predetermined temperature, and the melted spacer moves to the substrate. Temperature detector . The planar temperature detector according to claim 3, wherein the second electrode is composed of a planar conductor. The planar temperature detector according to claim 3 or 4, wherein the first electrode and the second electrode are disposed so as to be substantially orthogonal to each other. The planar temperature detector according to claim 1, wherein the first electrode or the second electrode is a sensor wire in which a temperature detection wire is wound around an outer periphery of a tensile strength wire. The planar temperature detector according to claim 1, wherein the first electrode or the second electrode has a heater function.

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