CN112381199A - Disposable passive RFID tag for temperature detection - Google Patents
Disposable passive RFID tag for temperature detection Download PDFInfo
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- CN112381199A CN112381199A CN202011137506.9A CN202011137506A CN112381199A CN 112381199 A CN112381199 A CN 112381199A CN 202011137506 A CN202011137506 A CN 202011137506A CN 112381199 A CN112381199 A CN 112381199A
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/02—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the selection of materials, e.g. to avoid wear during transport through the machine
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/02—Materials undergoing a change of physical state when used
- C09K5/06—Materials undergoing a change of physical state when used the change of state being from liquid to solid or vice versa
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/0722—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips comprising an arrangement for testing the record carrier
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
- G06K19/07798—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card part of the antenna or the integrated circuit being adapted for rupturing or breaking, e.g. record carriers functioning as sealing devices for detecting not-authenticated opening of containers
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Theoretical Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Computer Hardware Design (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Thermal Sciences (AREA)
- Combustion & Propulsion (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention relates to a disposable passive RFID label for temperature detection, which is characterized in that: the RFID tag comprises an antenna arranged on an antenna substrate and an RFID chip electrically connected with the antenna, wherein a phase change patch is pasted on a loop of the antenna, the phase change patch is of a three-layer structure which is in direct contact with a short circuit area of the antenna to play an isolation role, comprises a conductive particle-free phase change layer and a phase change patch surface layer, and a phase change material in the phase change patch is in solid-liquid phase change and forms flowing liquid after phase change. According to the invention, the RFID label is damaged by the fact that the conductive particles in the phase-change patch are deposited at the antenna after temperature change to cause the antenna short circuit, so that the temperature detection of the common RFID label can be realized, and the market demand on low-cost temperature detection of the RFID label is met.
Description
Technical Field
The invention relates to an electronic tag, in particular to a disposable passive RFID tag for temperature detection, which is suitable for articles with monitoring requirements on temperature change, and is particularly suitable for monitoring the condition that articles lose efficacy due to temperature change in the transportation process of valuables such as medicines, vaccines and the like.
Background
The RFID (Radio Frequency Identification) technology, also called RFID tag or RFID technology, is a technology that can identify a specific target by Radio signals and read and write related data, and does not require a recognition system to be in mechanical or optical contact with the specific target. The common passive RFID has three conditions of low frequency (125K-134.2K), high frequency (13.56 Mhz) and ultrahigh frequency (860-960 MHz). The radio frequency identification electronic tag comprises a chip for loading information and an antenna for receiving and transmitting electromagnetic wave signals, and the signals received by the antenna are used for supporting the work of the chip. If the label is attached to an object and the related information of the object is stored, the object can be identified by reading the data in the label. Currently, radio frequency identification electronic tags have been widely applied in the fields of retail management, book management, asset management, personnel identification, cold-chain logistics, and the like.
In the transportation of valuables such as current medicine, bacterin, it has very high demand to detect the overall process of temperature always, and some cold fresh food also have the demand of control to the temperature of transportation. The current mature proposal is that a temperature detector is arranged in a package, can detect real-time temperature and is powered by a battery. The product has the advantages of real-time temperature recording, GPS positioning function and capacity of recording the transport path of the package. The defects are obvious, the price is high, the battery needs to be charged frequently, and the safety of the battery is also a problem which is frequently suffered from the following problems.
Some chip manufacturers provide a second scheme, I/O interfaces are added on the RFID chip, and a temperature measurement circuit is designed inside the chip, so that the chip-level temperature measurement capability can be realized, and the temperature measurement data is transmitted to the receiver through the inherent radio frequency capability of the RFID chip. Compared with the first scheme, the scheme has a huge cost advantage, can use an active mode or a passive mode (an antenna receives electromagnetic waves and then converts the electromagnetic waves into electric energy) in the aspect of power supply, and has the defect that the cost of a chip is high, so that the cost of the tag is increased by ten times compared with that of a common RFID tag.
Disclosure of Invention
The invention aims to solve the defects of the prior art, and designs a disposable passive RFID tag for temperature detection, wherein a phase-change material layer with metal particles is combined on the tag, after the RFID tag reaches corresponding change temperature and time, the phase-change material is changed from a solid state to a liquid state, the metal particles in the phase-change material layer are contacted with an antenna part in a pre-designed short-circuit area of an RFID antenna immediately, so that an antenna loop is short-circuited, the RFID tag fails, and an external reader cannot read the RFID tag, so as to determine whether an article fails due to temperature change.
The invention is realized by the following steps: a disposable passive RFID tag for temperature detection, characterized by: the RFID label including locate antenna on the antenna substrate and the RFID chip of being connected with the antenna electricity, the return circuit facing of antenna has covered the phase transition paster, the phase transition paster be three layer construction, the order be with the antenna direct contact play isolation effect do not have conductive particle phase transition layer, contain conductive particle phase transition layer and phase transition paster surface course. The phase-change patch is characterized in that the pasting position of the phase-change patch is a short circuit area of the antenna, the shape of the phase-change layer without conductive particles is the same as that of the phase-change layer containing conductive particles, the surface area of the phase-change patch is equal to that of the phase-change layer containing conductive particles, the surface area of the phase-change patch is larger than that of the phase-change layer containing conductive particles, the phase-change layer containing conductive particles and the phase-change layer without conductive particles in the phase-change patch are in solid-liquid.
The thickness of the phase change layer containing the conductive particles is not less than 0.10mm, and the thickness of the surface layer of the phase change patch is 0.02-0.10 mm. The conductive particles in the phase change layer containing the conductive particles account for 10-40% of the total mass of the phase change layer containing the conductive particles, and the conductive particles in the phase change layer containing the conductive particles are in a sheet shape, a branch shape, a sphere shape or a needle shape. After the phase change layer without conductive particles and the phase change layer containing conductive particles in the phase change patch reach the phase change temperature, the viscosity value of the liquid phase is 1000-15000 cp.
The conductive particles in the phase change layer containing the conductive particles are conductive particles formed by one or more conductive substances of metal particles, nonmetal particles and metal oxide particles, the metal particles are selected from one or more of copper, nickel and aluminum, and the nonmetal particles are selected from one or two of graphene and graphite.
The phase-change material has obvious solid-liquid two-state change performance, and when the phase-change material is heated to reach the phase-change temperature, the presented liquid state has certain fluidity, so that the conductive metal particles contained in the phase-change material are gradually deposited on the antenna under the action of gravity or other external force, the antenna is short-circuited, and the RFID label fails to be read.
The invention has the beneficial effects that: the invention adopts the phase-change material, can conveniently adjust the phase-change temperature of the phase-change material according to different requirements of application conditions. The invention utilizes the energy storage characteristic of the phase-change material, namely, the material is not immediately converted into the liquid state after being heated to the phase-change temperature, but continuously absorbs a large amount of heat until the heat storage capacity is used up, and then the material is converted into the liquid state. This avoids the interference of momentary high temperatures which occur in certain situations. Meanwhile, the solid-liquid transition time can be regulated and controlled by thickening the thickness of the phase-change material layer, so that whether the environmental temperature of the article exceeds a monitoring value or not is accurately judged.
The disposable passive RFID tag can accurately know whether the environment of the RFID tag exceeds the set monitoring temperature within a certain period of time without needing a more expensive RFID chip or a temperature detection sensor powered by a battery. Meanwhile, the phase-change material causes the short circuit state of the antenna to be irreversible after the phase change, thereby ensuring the disposable effect of the invention and avoiding the occurrence of artificial false conditions. In addition, the production of the RFID label does not change the current production process, does not increase the processing cost of the existing label, only uses the phase-change patch with low price, and greatly reduces the manufacturing cost of the label with the temperature measurement function. Therefore, the invention has the excellent effects of low processing and manufacturing cost, easy realization, stable monitoring state and the like.
Drawings
Fig. 1 is a schematic structural diagram of a high-frequency RFID tag according to embodiment 1 of the present invention.
Fig. 2 is a schematic cross-sectional view of the phase-change patch of fig. 1.
Fig. 3 is a schematic diagram of the short-circuit area location distribution of the uhf RFID tag in embodiment 2 of the present invention.
Fig. 4 is a schematic diagram illustrating the position of the phase-change patch in the invention attached to the short-circuit region in fig. 3.
In the figure: 1. an antenna base material; 2. An RFID chip; 3. An antenna; 4. Phase-change paster; 31. A short-circuit area; 41. A phase change layer containing conductive particles; 42. No conductive particle phase change layer; 43. And (5) a phase-change surface mounting layer.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
According to the attached drawings 1-4, the invention relates to a disposable passive RFID tag for temperature detection, which comprises an antenna 3 arranged on an antenna substrate 1 and an RFID chip 2 electrically connected with the antenna 3, wherein a short circuit area 31 is arranged on a loop of the antenna 3, a phase change patch 4 is pasted on the short circuit area 31, the phase change patch 4 is of a three-layer structure, and the three-layer structure comprises a non-conductive particle phase change layer 42, a conductive particle-containing phase change layer 41 and a phase change patch surface layer 43 which are in direct contact with and have an isolation effect on the short circuit area 31 of the antenna 3. The shape of the phase change layer 42 without conductive particles is the same as that of the phase change layer 41 with conductive particles, the surface area is the same, the surface area of the phase change patch surface layer 43 is larger than that of the phase change layer 41 with conductive particles, and the phase change layer 42 without conductive particles and the phase change layer 41 with conductive particles are coated on the antenna 3.
The invention realizes the temperature detection of application occasions with different temperature requirements by changing the critical temperature of the phase-change material layer, for example, the storage temperature of some injection is required to be 0 ℃, and the storage temperature of some medicines is required to be not more than 20 ℃, and the like. The solid-liquid transition time is regulated and controlled by thickening the phase change layer, so that the condition that the monitored object fails, such as opening the box and counting the number, can not be caused although instantaneous overtemperature occurs at some time is filtered.
The thickness of the phase change layer 41 containing the conductive particles is not less than 0.10mm, and the thickness of the phase change patch surface layer 43 is 0.02-0.10 mm.
The conductive particles in the conductive particle-containing phase change layer 41 are in a sheet shape, a branch shape, a sphere shape or a needle shape, wherein the sheet shape is the best, the sheet shape can increase the conductive area, the usage amount of the conductive particles is less under the same condition, and the conductive particle-containing phase change layer has the effect of obviously saving the manufacturing cost of the label in batch production.
The conductive particles in the phase change layer 41 containing conductive particles are conductive particles composed of one or more conductive substances selected from metal particles, non-metal particles and metal oxide particles, the metal particles are generally selected from copper, nickel and aluminum, and the non-metal particles are selected from graphene and graphite.
After the phase-change material reaches the phase-change temperature, the viscosity value of the liquid state is 1000-15000 cp.
Example 1:
according to fig. 1 and 2, the present embodiment is a high frequency RFID tag.
In this embodiment, the patterned antenna 3 is first fabricated on the surface of the PET film (i.e., the antenna substrate 1) by an aluminum etching process.
And then the RFID chip 2 and the two bonding pads of the antenna 3 are fixed together in an anisotropic conductive adhesive or gold wire bonding mode to form electrical connection. The high frequency antenna is generally a multi-turn antenna closely connected so that there is no need to separately design the short-circuit region 31.
Firstly, the percentage of paraffin with different melting points is adjusted to obtain the phase-change paraffin material with the phase-change temperature of 20 ℃.
And (3) raising the temperature of the paraffin to be higher than the phase transition temperature, doping the metal particles, and uniformly stirring. The mass ratio of the metal particles is 30%, in this embodiment, the material of the metal particles is selected to be copper, the particle size is 3-5 μm, and the particle shape is sheet.
The mixed solution is coated on the surface of the polyester film substrate, the coating range is smaller than the surface area of the polyester film, the mixed solution is rapidly reduced to the temperature below the phase change temperature, so that the metal particles are uniformly distributed in the phase change material, and the thickness of the phase change layer 41 containing the conductive particles after mixing and curing in the embodiment is kept at 0.3 mm.
The quantity of metal particles in the phase change layer 41 containing conductive particles can influence the temperature conduction speed, and the quantity of latent heat absorbed by the phase change material after the phase change material reaches the phase change temperature, namely the time for converting the phase change material into liquid, so that the quantity of the metal particles and the particle size are important parameters for adjusting the alarm temperature.
And continuously coating a layer of phase change paraffin material with the thickness of about 0.1mm on the surface of the recovered solid phase change layer 41 containing the conductive particles to form a phase change layer 42 without the conductive particles (the phase change temperature is 20 ℃), forming a phase change patch surface layer 43 by using the polyurethane film as the base material, and finishing the manufacturing of the phase change patch 4. After the phase change patch 4 is attached to the short-circuit area of the RFID tag, the phase change patch surface layer 43 can prevent the disordered liquefied flow of the phase change layer 42 without conductive particles and the phase change layer 41 with conductive particles after phase change.
Since the high-frequency antenna is generally a multi-turn antenna which is closely connected, the short-circuit area 31 does not need to be separately designed, and finally, the phase-change patch 4 only needs to be attached to the coil dense area of the high-frequency RFID tag, and the patch position is the short-circuit area 31 of the antenna 3.
The manufactured RFID label is attached to the surface of an article, when the environmental temperature rises to the phase-change temperature and is kept for 2-3 minutes, the phase-change layer 41 containing the conductive particles and the phase-change layer 42 without the conductive particles on the phase-change patch 4 are changed from solid to liquid, the conductive particles contained in the phase-change layer 41 containing the conductive particles are deposited at the short-circuit area 31 of the antenna 3 under the action of gravity and the surface layer 43 of the phase-change patch, and the RFID label is disabled due to the short circuit of the antenna 3.
At this point the RFID tag cannot be read by the reader, and it can be determined that the item to which the RFID tag is attached has experienced a temperature exceeding the temperature of the phase change material. For drugs, vaccines, etc. that may become ineffective due to temperature change, it may be determined that the current item has failed.
Example 2:
according to fig. 3 and 4, the present embodiment is an ultra high frequency RFID tag.
In the uhf RFID tag, generally, a short-circuit region 31 of the antenna 3 needs to be designed near the RFID chip 2, that is, the dotted circle in fig. 3, in this embodiment, the phase-change patch 4 is directly attached to the short-circuit region 31 of the uhf antenna.
The rest is the same as example 1.
The foregoing is considered as illustrative of the preferred embodiments of the invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (6)
1. A disposable passive RFID tag for temperature detection, characterized by: the RFID label including locate antenna on the antenna substrate and the RFID chip of being connected with the antenna electricity, the return circuit facing of antenna has covered the phase transition paster, the phase transition paster be three layer construction, the order be with the antenna direct contact play isolation effect do not have conductive particle phase transition layer, contain conductive particle phase transition layer and phase transition paster surface course.
2. A disposable passive RFID tag for temperature detection according to claim 1, characterized in that: the phase-change patch is characterized in that the pasting position of the phase-change patch is a short circuit area of the antenna, the shape of the phase-change layer without conductive particles is the same as that of the phase-change layer containing conductive particles, the surface area of the phase-change patch is equal to that of the phase-change layer containing conductive particles, the surface area of the phase-change patch is larger than that of the phase-change layer containing conductive particles, the phase-change layer containing conductive particles and the phase-change layer without conductive particles in the phase-change patch are in solid-liquid.
3. A disposable passive RFID tag for temperature detection according to claim 1 or 2, characterized in that: the thickness of the phase change layer containing the conductive particles is not less than 0.10mm, and the thickness of the surface layer of the phase change patch is 0.02-0.10 mm.
4. A disposable passive RFID tag for temperature detection according to claim 3, characterized in that: the conductive particles in the phase change layer containing the conductive particles account for 10-40% of the total mass of the phase change layer containing the conductive particles, and the conductive particles in the phase change layer containing the conductive particles are in a sheet shape, a branch shape, a sphere shape or a needle shape.
5. A disposable passive RFID tag for temperature detection according to claim 3, characterized in that: the conductive particles in the phase change layer containing the conductive particles are conductive particles formed by one or more conductive substances of metal particles, nonmetal particles and metal oxide particles, the metal particles are selected from one or more of copper, nickel and aluminum, and the nonmetal particles are selected from one or two of graphene and graphite.
6. A disposable passive RFID tag for temperature detection according to claim 1 or 2, characterized in that: after the phase change layer without conductive particles and the phase change layer containing conductive particles in the phase change patch reach the phase change temperature, the viscosity value of the liquid phase is 1000-15000 cp.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011137506.9A CN112381199B (en) | 2020-10-22 | 2020-10-22 | Disposable passive RFID tag for temperature detection |
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| CN202011137506.9A CN112381199B (en) | 2020-10-22 | 2020-10-22 | Disposable passive RFID tag for temperature detection |
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| CN112381199B CN112381199B (en) | 2024-03-22 |
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2020
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| CN106829161A (en) * | 2015-12-07 | 2017-06-13 | 卡梅德生物科技（天津）有限公司 | A kind of multifunctional bio medicine packing box |
| CN206411701U (en) * | 2016-12-02 | 2017-08-15 | 肇庆学院 | A kind of semi-active RFID of flexible adhesive type |
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| CN110942131A (en) * | 2019-10-04 | 2020-03-31 | 海王数据信息技术(天津)有限公司 | RFID temperature measurement tag, control method and application device |
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