Low-temperature warm-keeping heating sheet and operation control method

Abstract

The invention provides a low-temperature warm-keeping heating sheet and an operation control method. The low-temperature warm-keeping heating sheet comprises a carbon fiber heating layer, a circuit layer, a heat conduction layer and an insulating layer, the carbon fiber heating layer comprises a carbon fiber heating sheet, and an upper surface and a lower surface which are opposite to each other; the circuit layer is located on the upper surface of the carbon fiber heating layer and comprises a battery element and a temperature control protection circuit; the carbon fiber heating layer and the circuit layer are coated with the heat conduction layer; the insulating layer is attached to the outside of the heat conduction layer. The low-temperature warm-keeping heating sheet adopts the NVOPF sodium ion battery as a battery element, so that the use of an expensive lithium ion battery and a lead-acid storage battery with poor low-temperature performance is avoided, the production cost is reduced, and the excellent low-temperature performance is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of low-temperature batteries, and in particular to a low-temperature warming heating sheet and an operation control method thereof. Background Art

[0002] In order to resist the cold, heating sheets are usually used to heat clothes. Heating sheets usually use batteries as the power source. At present, due to the saturation of lithium-ion batteries in the battery industry, sodium-ion batteries have attracted people's attention due to their excellent low-temperature performance and low manufacturing cost. Therefore, how to effectively apply sodium-ion batteries to heating sheets and then develop flexible heating sheets with rapid heating, uniform heating and high safety performance has become a research hotspot. Summary of the invention

[0003] In order to solve the current technical problems, the main purpose of the present invention is to provide a low-temperature warming heating plate and an operation control method. The low-temperature warming heating plate adopts NVOPF sodium-ion batteries as battery elements, avoiding the use of expensive lithium-ion batteries and lead-acid batteries with poor low-temperature performance, which not only reduces production costs but also ensures excellent low-temperature performance. In addition, the carbon fiber heating layer has the advantages of being light, flexible and uniformly heated, which is conducive to application in wearable devices. At the same time, the protective part of the circuit layer can detect the temperature of the low-temperature warming heating plate in time, cut off the circuit when the temperature is too high to prevent burns and the like, and protect the circuit and battery from damage when a short circuit occurs.

[0004] In order to realize the above-mentioned technical features, the object of the present invention is achieved as follows: a low-temperature thermal insulation heating sheet comprises a carbon fiber heating layer, a circuit layer, a thermal conductive layer and an insulating layer; the carbon fiber heating layer comprises a carbon fiber heating sheet and relative upper and lower surfaces; the circuit layer is located on the upper surface of the carbon fiber heating layer, and comprises a battery element and a temperature control protection circuit; the thermal conductive layer is coated on the outside of the carbon fiber heating layer and the circuit layer; the insulating layer is attached to the outside of the thermal conductive layer.

[0005] Preferably, the carbon fiber heating layer comprises a plurality of parallel and spaced carbon fiber sheets, surfaces on the same side of the plurality of carbon fiber sheets constitute the upper surface, and surfaces on the other side of the plurality of carbon fiber sheets constitute the lower surface.

[0006] Preferably, the circuit layer includes a heating part, a temperature detection and control part, an overheat protection part and a short circuit protection part; the heating part is used to provide power for the carbon fiber heating layer, the temperature detection and control part is connected to the carbon fiber heating layer and the heating part at the same time to detect the temperature during the heating process, the overheat protection part is connected to the heating part and is used for overheat protection, and the short circuit protection part is used for short circuit protection.

[0007] Preferably, the heating part includes a sodium ion button battery, a resettable fuse, a MOSFET switch and a microcontroller MCU; the positive electrode of the sodium ion button battery is connected to the drain of the MOSFET switch through the resettable fuse; the source of the MOSFET switch is connected to the upper surface of the carbon fiber heating layer through a wire, and then passes through the carbon fiber heating layer and goes back from its lower surface to be connected to the negative electrode of the sodium ion button battery; the gate of the MOSFET switch is connected to an output pin of the microcontroller MCU.

[0008] Preferably, the temperature detection and control part includes a temperature sensor and a microcontroller MCU; the output end of the temperature sensor is connected to an analog input pin of the microcontroller MCU.

[0009] Preferably, the overheat protection part includes an overheat protection element; the overheat protection element is connected in series to the heating part, and the overheat protection element adopts a thermal switch or a bimetallic temperature relay.

[0010] Preferably, the short-circuit protection part includes a short-circuit protection element; the short-circuit protection element is connected in series to the input end of the circuit; the short-circuit protection element adopts a self-recovering fuse or a fuse.

[0011] Preferably, the thermal conductive layer includes a first surface layer and a second surface layer; the second surface layer is connected to the lower surface of the carbon fiber heating layer, and the size of the second surface layer is larger than the size of the carbon fiber heating layer; the first surface layer is arranged on the side of the circuit layer away from the carbon fiber heating layer, and the size of the first surface layer is larger than the size of the carbon fiber heating layer; the first surface layer and the second surface layer are connected to wrap the carbon fiber heating layer and the circuit layer therein.

[0012] Preferably, the insulating layer is attached to the first surface layer and the second surface layer of the heat-conducting layer, and wraps the heat-conducting layer, the circuit layer and the carbon fiber heating layer therein.

[0013] On the other hand, the present invention provides an operation control method for a low-temperature warm-keeping heating plate. Through a complete circuit setting, in an initial state, the circuit switch is disconnected. When the temperature is lower than 25°C, the circuit switch is automatically closed. During the heating process, the circuit is driven to operate by the self-discharge characteristics of the sodium ion button battery. When current passes through the carbon fiber heating layer, the carbon molecules rub and collide with each other to achieve the conversion of electrical energy into thermal energy. At the same time, the temperature detection part and the overheating and short-circuit protection part work together to maintain the temperature of the heating plate between 25°C and 50°C, and timely cut off the power for protection when the temperature is too high or the circuit is short-circuited. The heat is then transferred to the human body through the thermal conductive layer to achieve a good thermal insulation effect.

[0014] The present invention has the following beneficial effects: 1. The low-temperature warming heating sheet of the present invention adopts NVOPF sodium-ion battery as battery element, avoiding the use of expensive battery materials and lead-acid batteries with poor low-temperature performance, which not only reduces production costs but also ensures excellent low-temperature performance, so that it can effectively provide the required heat at low temperatures.

[0015] 2. The low-temperature warming heating sheet of the present invention is flexible and can be applied to wearable devices. It also has functions such as temperature detection and overheating protection, which can easily protect the health of working people in low temperatures.

[0016] 3. The low-temperature warm-keeping heating plate of the present invention adopts food-grade silica gel as the insulating layer material, which can not only effectively avoid the risk of electric shock but also has a waterproof function and is highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 It is a structural schematic diagram of the low-temperature warming heating sheet of the present invention.

[0019] Figure 2 It is a schematic structural diagram of the carbon fiber heating layer of the low-temperature thermal insulation heating sheet of the present invention.

[0020] Figure 3 (a) and (b) are schematic diagrams of the structure of the circuit layer of the low-temperature warming heating sheet of the present invention.

[0021] Figure 4 It is a schematic structural diagram of the heat-conducting layer of the low-temperature warm-keeping heating sheet of the present invention.

[0022] Figure 5 It is a schematic structural diagram of the insulation layer of the low-temperature warming heating sheet of the present invention.

[0023] In the figure: 1 carbon fiber heating layer; 2 circuit layer; 3 heat conductive layer; 4 insulating layer; 5 carbon fiber sheet; 6 upper surface; 7 lower surface; 8 heating part; 9 temperature detection and control part; 10 overheat protection part; 11 short circuit protection part; 12 sodium ion button battery; 13 self-recovery fuse; 14 MOSFET switch; 15 microcontroller MCU; 16 positive electrode of sodium ion button battery; 17 negative electrode of sodium ion button battery; 18 source of MOSFET switch; 19 drain of MOSFET switch; 20 gate of MOSFET switch; 21 an output pin of microcontroller MCU; 22 temperature sensor; 23 output end of temperature sensor; 24 overheat protection element; 25 short circuit protection element; 26 input end of circuit; 27 first surface layer of heat conductive layer; 28 second surface layer of heat conductive layer. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0025] Embodiment 1: like Figure 1 As shown, the present invention provides a technical solution: a low-temperature warm-keeping heating plate, comprising a carbon fiber heating layer, a circuit layer, a heat-conducting layer and an insulating layer, wherein the carbon fiber heating layer comprises a carbon fiber heating plate and a relative upper surface and a lower surface; the circuit layer comprises a battery element and a temperature control protection circuit, which is located on the upper surface of the carbon fiber heating layer; the heat-conducting layer is coated outside the carbon fiber heating layer and the circuit group; the insulating layer is attached to the outside of the heat-conducting layer. The heating plate adopts NVOPF sodium-ion battery, which avoids the use of expensive battery materials and lead-acid batteries with poor low-temperature performance, reduces production costs while ensuring excellent low-temperature performance, so that it can effectively provide the required heat at low temperatures. At the same time, the insulating material used is both practical and environmentally friendly.

[0026] like Figure 2 As shown, the carbon fiber heating layer includes a plurality of parallel and spaced carbon fiber sheets, the surfaces of the same side of the plurality of carbon fiber sheets constitute the upper surface, and the surfaces of the other side of the plurality of carbon fiber sheets constitute the lower surface. The size and shape of the overall heating sheet can be changed according to the number of different carbon fiber sheets, so that the heating sheet can be applied to different parts of the clothing.

[0027] Furthermore, the carbon fiber sheet is bendable, which is convenient for application in wearable devices and allows for uniform heating. In addition, the parallel arrangement is more conducive to heat concentration and uniform heating.

[0028] like Figure 3 As shown, the circuit layer includes a heating part, a temperature detection and control part, an overheat protection part and a short circuit protection part. The four parts are interconnected, making full use of the space and reducing the weight and volume of the heating plate.

[0029] Furthermore, the heating part includes an NVOPF sodium ion button battery, a resettable fuse, a MOSFET switch and a microcontroller MCU; the positive electrode of the NVOPF sodium ion button battery is connected to the drain of the MOSFET switch through the resettable fuse; the source of the MOSFET switch is connected to the upper surface of the carbon fiber heating layer through an electric wire, and then passes through the carbon fiber heating layer and goes back from its lower surface to be connected to the negative electrode of the NVOPF sodium ion button battery; the gate of the MOSFET switch is connected to an output pin of the microcontroller MCU for controlling its on and off.

[0030] Furthermore, the temperature detection and control part includes a temperature sensor and a microcontroller MCU, and the output end of the temperature sensor is connected to an analog input pin of the microcontroller MCU. The temperature sensor should ensure that the temperature detection accuracy is within ±0.5°C, such as a DS18B20 temperature sensor. By writing the control program of the MCU, the setting of the initial temperature range, temperature reading, heating control and other parts are realized. By setting the temperature threshold, the MCU can read the value of the temperature sensor and determine whether the current temperature is in the set value interval. If it is lower than the minimum value of the interval, the MCU outputs a high-level signal to turn on the MOSFET switch and start the heating element. If it is higher than the maximum value of the interval, the MCU outputs a low-level signal to turn off the MOSFET switch and stop heating.

[0031] Furthermore, the overheat protection part includes an overheat protection element; the overheat protection element is connected in series to the heating part. The overheat protection element adopts a thermal switch or a bimetallic temperature relay. By setting an action temperature higher than the maximum value of the set temperature range, when the circuit temperature exceeds the set value, the heating part circuit is cut off to prevent overheating damage.

[0032] Furthermore, the short-circuit protection part includes a short-circuit protection element; the short-circuit protection element is connected in series to the input end of the circuit and is used to cut off the circuit when a short circuit occurs; the short-circuit protection element adopts a self-recovering fuse or a fuse.

[0033] like Figure 4 As shown, the heat-conducting layer includes a first surface layer and a second surface layer, the first surface layer is connected to the lower surface of the carbon fiber heating layer, and the size of the first surface layer is slightly larger than the size of the carbon fiber heating layer; the second surface layer is arranged on the side of the circuit layer away from the carbon fiber heating layer, and the size of the second surface layer is slightly larger than the size of the carbon fiber heating layer; the first surface layer and the second surface layer are connected to wrap the carbon fiber heating layer and the circuit layer therein, so as to efficiently transfer the heat generated by the carbon fiber heating layer and the circuit layer to the human body.

[0034] like Figure 5 As shown, the insulating layer is attached to the first surface and the second surface of the heat-conducting layer, and the heat-conducting layer, the circuit layer and the carbon fiber heating layer are all wrapped therein. The insulating layer is made of food-grade silicone, which is soft and elastic, and is resistant to high temperatures, waterproof, non-toxic and environmentally friendly.

[0035] Embodiment 2: The operation control method of the low-temperature warm-keeping heating sheet is to set up a complete circuit. In the initial state, the circuit switch is disconnected. When the temperature is lower than 25°C, the circuit switch is automatically closed. During the heating process, the self-discharge characteristics of the sodium ion button battery drive the circuit to operate. When the current passes through the carbon fiber heating layer, the carbon molecules rub and collide with each other to achieve the conversion of electrical energy to thermal energy. At the same time, the temperature detection part and the overheating and short-circuit protection part work together to maintain the temperature of the heating sheet between 25°C and 50°C, and to cut off the power in time when the temperature is too high or the circuit is short-circuited. The heat is then transferred to the human body through the thermal conductive layer to achieve a good thermal insulation effect.

Claims

1. Low temperature warming heating sheet, characterized in that: It comprises a carbon fiber heating layer (1), a circuit layer (2), a heat conducting layer (3) and an insulating layer (4); the carbon fiber heating layer (1) comprises a carbon fiber heating sheet and an upper surface (6) and a lower surface (7) which are opposite to each other; the circuit layer (2) is located on the upper surface of the carbon fiber heating layer (1) and comprises a battery element and a temperature control protection circuit; The heat-conducting layer (3) is coated outside the carbon fiber heating layer (1) and the circuit layer (2); The insulating layer (4) is attached to the outside of the heat conducting layer (3).

2. The low temperature warming heating sheet according to claim 1, characterized in that: The carbon fiber heating layer (1) comprises a plurality of carbon fiber sheets (5) arranged in parallel and at intervals, the surfaces on the same side of the plurality of carbon fiber sheets (5) forming the upper surface (6), and the surfaces on the other side of the plurality of carbon fiber sheets (5) forming the lower surface (7).

3. The low temperature warming heating sheet according to claim 1, characterized in that: The circuit layer (2) comprises a heating part (8), a temperature detection and control part (9), an overheat protection part (10) and a short circuit protection part (11); the heating part (8) is used to provide power to the carbon fiber heating layer (1), the temperature detection and control part (9) is connected to the carbon fiber heating layer (1) and the heating part (8) for detecting the temperature during the heating process, the overheat protection part (10) is connected to the heating part (8) and is used for overheat protection, and the short circuit protection part (11) is used for short circuit protection.

4. The low temperature warming heating sheet according to claim 1, characterized in that: The heating part (8) comprises a sodium ion button battery (12), a resettable fuse (13), a MOSFET switch (14) and a microcontroller MCU (15); the positive electrode (16) of the sodium ion button battery (12) is connected to the drain electrode (19) of the MOSFET switch (14) through the resettable fuse (13); the source electrode (18) of the MOSFET switch (14) is connected to the upper surface (6) of the carbon fiber heating layer (1) through a wire, and then passes through the carbon fiber heating layer (1) and goes back from its lower surface to be connected to the negative electrode (17) of the sodium ion button battery (12); the gate electrode (20) of the MOSFET switch (14) is connected to an output pin (21) of the microcontroller MCU.

5. The low temperature warming heating sheet according to claim 4, characterized in that: The temperature detection and control part (9) comprises a temperature sensor (22) and a microcontroller MCU (15); an output end (23) of the temperature sensor (22) is connected to an analog input pin (29) of the microcontroller MCU (15).

6. The low temperature warming heating sheet according to claim 4, characterized in that: The overheat protection part (10) comprises an overheat protection element (24); the overheat protection element (24) is connected in series to the heating part (8), and the overheat protection element (24) is a thermal switch or a bimetallic temperature relay.

7. The low temperature warming heating sheet according to claim 4, characterized in that: The short-circuit protection part (11) comprises a short-circuit protection element (25); the short-circuit protection element (25) is connected in series to an input end (26) of a circuit; the short-circuit protection element (25) is a self-recovering fuse or a fuse.

8. The low temperature warming heating sheet according to claim 4, characterized in that: The heat-conducting layer (3) comprises a first surface layer (27) and a second surface layer (28); the second surface layer (28) is connected to the lower surface (7) of the carbon fiber heating layer (1), and the size of the second surface layer (28) is larger than the size of the carbon fiber heating layer (1); the first surface layer (27) is arranged on a side of the circuit layer (2) away from the carbon fiber heating layer (1), and the size of the first surface layer (27) is larger than the size of the carbon fiber heating layer (1); the first surface layer (27) and the second surface layer (28) are connected to wrap the carbon fiber heating layer (1) and the circuit layer (2) therein.

9. The low temperature warming heating sheet according to claim 8, characterized in that: The insulating layer (4) is attached to the first surface layer (27) and the second surface layer (28) of the heat-conducting layer (3), and wraps the heat-conducting layer (3), the circuit layer (2) and the carbon fiber heating layer (1) therein.

10. The operation control method of the low temperature warming heating sheet according to any one of claims 5 to 9, characterized in that: Through the complete circuit setting, in the initial state, the circuit switch is disconnected. When the temperature is lower than 25℃, the circuit switch is automatically closed. During the heating process, the circuit is driven by the self-discharge characteristics of the sodium ion button battery. When the current passes through the carbon fiber heating layer, the carbon molecules rub and collide with each other to achieve the conversion of electrical energy into thermal energy. At the same time, the temperature detection part and the overheating and short-circuit protection part work together to maintain the temperature of the heating plate between 25℃ and 50℃, and timely power off protection when the temperature is too high or the circuit is short-circuited. The heat is then transferred to the human body through the thermal conductive layer to achieve a good thermal insulation effect.

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