Heat radiation sheet

Abstract

The utility model provides a heat radiation sheet. The heat radiation sheet comprises a temperature sensing element, a flame-retardant layer, a heating film, a reflecting layer and a flexible layer, the temperature sensing element is connected with the heating film; the heating film comprises a substrate layer, a heating layer, a positive electrode and a negative electrode. The heating layer and the substrate layer are stacked, and the heating layer is communicated with the positive electrode and the negative electrode; the areas of the positive electrode and the negative electrode at the two ends of the substrate layer are larger than those of the positive electrode and the negative electrode in the middle of the substrate layer, and the positive electrode and the negative electrode are positioned on the same surface of the substrate layer; or the positive electrode and the negative electrode are respectively positioned on the front surface and the back surface of the substrate layer. According to the invention, the arrangement mode of the positive electrode and the negative electrode enables the heating film to uniformly heat, increases the heating area, and improves the heating value. By arranging the reflecting layer, heat generated by the heating film can be reflected to the user side, and the heat utilization rate is increased. By arranging the temperature sensing element, power-off protection can be achieved under the condition that the temperature is too high, and the use safety is improved.

Description

Technical Field

[0001] The present application belongs to the field of heating technology, and more specifically, relates to a heat radiation sheet. Background Art

[0002] Neck massagers, eye massagers, moxibustion devices and other products usually need to be equipped with heating films to achieve the purpose of heat therapy. Due to the problem of product volume, the area of ​​the heating film is generally not very large, so the uniformity of heating of the entire heating film is required to be high.

[0003] The heating film generally includes a substrate layer and electrodes arranged on the substrate layer. The electrodes can generate heat when energized. The arrangement of the electrodes in the heating film is as follows: Figure 8 and Fig. 9 As shown, however, with this arrangement, the electrodes at both ends of the substrate layer will experience heat loss, resulting in uneven heating of the heating film, that is, the heating value at the two ends is lower than that in the middle. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide a heat radiation sheet to solve the technical problems of small heating area and uneven heating of the heating film in the prior art.

[0005] To achieve the above-mentioned purpose, the technical solution adopted in the present application is: to provide a heat radiation sheet, comprising a temperature sensing element and a flame retardant layer, a heating film, a reflective layer and a flexible layer stacked in sequence; the temperature sensing element is connected to the heating film; the heating film comprises a base layer, a heating layer, a positive electrode and a negative electrode; the heating layer is stacked with the base layer, and the heating layer is connected to the positive electrode and the negative electrode;

[0006] The areas of the positive electrode and the negative electrode at the two ends of the base layer are larger than those of the positive electrode and the negative electrode at the middle of the base layer, and the positive electrode and the negative electrode are located on the same surface of the base layer;

[0007] Alternatively, the positive electrode and the negative electrode are respectively located on the front and back surfaces of the substrate layer.

[0008] Optionally, the positive electrode includes a first wire portion and a plurality of first electrode portions arranged on the first wire portion; the negative electrode includes a second wire portion and a plurality of second electrode portions arranged on the second wire portion; the first wire portion and the second wire portion are arranged in parallel; the first electrode portion and the second electrode portion are arranged one by one in an interlaced manner in a finger shape.

[0009] Optionally, the positive electrode and the negative electrode are located on the same surface of the base layer; the width of the first electrode portion and the second electrode portion located at both ends of the base layer is greater than the width of the first electrode portion and the second electrode portion located in the middle of the base layer.

[0010] As another optional solution, the positive electrode includes a first wire portion, the negative electrode includes a second wire portion, and the first wire portion and the second wire portion are arranged in parallel;

[0011] The heating layer has a heating area, which is in a strip shape. One end of the heating area is connected to the first wire portion, and the other end of the heating area is connected to the second wire portion.

[0012] Optionally, a plurality of heating zones are provided, and the plurality of heating zones are spaced apart along the length direction of the first wire portion.

[0013] Optionally, the positive electrode and the negative electrode are located on the same surface of the base layer, the first wire portion and the second wire portion located at both ends of the base layer are curved, and the first wire portion and the second wire portion located in the middle of the base layer are straight.

[0014] As another optional scheme, the positive electrode is arranged on the front side of the base layer, and the negative electrode is arranged on the back side of the base layer; one end of the heating layer is connected to the first wire portion, and the other end of the heating layer extends through the front and side surfaces of the base layer to the back side of the base layer and is connected to the second wire portion.

[0015] Optionally, a conductive portion is provided on the side surface, and the conductive portion is used to conduct the heat generating layer located on the front surface with the heat generating layer located on the back surface.

[0016] Optionally, an avoidance groove is provided on the reflective layer, and the avoidance groove runs through the upper surface and the lower surface of the reflective layer; and the temperature sensing element is arranged in the avoidance groove.

[0017] Optionally, the temperature sensing element is an NTC temperature sensor.

[0018] The beneficial effect of the heat radiation sheet provided by the present application is that: compared with the prior art, in the present application, the area of ​​the positive electrode and the negative electrode at both ends of the base layer is larger than the area of ​​the positive electrode and the negative electrode in the middle of the base layer, and the positive electrode and the negative electrode are respectively located on the front and back surfaces of the base layer, which can make the heating film heat evenly, increase the heating area, and improve the heat generation; by setting a reflective layer, the heat generated by the heating film can be reflected to the user side, avoiding heat loss and improving the utilization rate of heat. By setting a temperature sensing element, the temperature of the heating film can be detected, and when the temperature is too high, the power can be cut off for protection, thereby improving the safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 A schematic diagram of the exploded structure of the heat radiation sheet provided in an embodiment of the present application;

[0021] Figure 2 A schematic diagram of the main structure of the heat radiation sheet provided in an embodiment of the present application;

[0022] Figure 3 A schematic diagram of the top view of the heat radiation sheet provided in an embodiment of the present application;

[0023] Figure 4 A schematic diagram of the heat radiation state of the heat radiation sheet provided in an embodiment of the present application;

[0024] Figure 5 This is a schematic diagram of the main structure of the heat-generating film in the heat radiation sheet provided in Example 1 of the present application;

[0025] Figure 6 This is a schematic diagram of the main structure of the heat-generating film in the heat radiation sheet provided in the second embodiment of the present application;

[0026] Figure 7 This is a schematic diagram of the main structure of the heat-generating film in the heat radiation sheet provided in Example 3 of the present application;

[0027] Figure 8 Schematic diagram of the structure of the heating film in the prior art Figure 1 ;

[0028] Fig. 9 Schematic diagram of the structure of the heating film in the prior art Figure 2 .

[0029] Among them, the reference numerals in the figure are:

[0030] 100-temperature sensing element;

[0031] 200-flame retardant layer;

[0032] 300 - heating film; 301 - base layer; 302 - heating area; 331 - first wire portion; 332 - first electrode portion; 333 - second wire portion; 334 - second electrode portion;

[0033] 400-reflection layer; 401-avoidance groove;

[0034] 500-flexible layer;

[0035] 600-cable bundle;

[0036] 700-connector. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0038] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0039] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0041] Please also read Figure 1 and Figure 2 , the heat radiation sheet provided in the embodiment of the present application is now described. The heat radiation sheet comprises a temperature sensing element 100 and a flame retardant layer 200, a heating film 300, a reflective layer 400 and a flexible layer 500 which are stacked in sequence; the temperature sensing element 100 is connected to the heating film 300; the heating film 300 comprises a base layer 301, a heating layer, a positive electrode and a negative electrode; the heating layer is stacked with the base layer 301, and the heating layer is connected to the positive electrode and the negative electrode; the area of ​​the positive electrode and the negative electrode at both ends of the base layer 301 is larger than the area of ​​the positive electrode and the negative electrode at the middle of the base layer 301, and the positive electrode and the negative electrode are located on the same surface of the base layer 301; or, the positive electrode and the negative electrode are located on the front and back surfaces of the base layer 301 respectively.

[0042] Compared with the prior art, the heat radiation sheet provided in the embodiment of the present application has the following characteristics: the area of ​​the positive electrode and the negative electrode at both ends of the base layer 301 is larger than the area of ​​the positive electrode and the negative electrode at the middle of the base layer 301; the positive electrode and the negative electrode are respectively located on the front and back surfaces of the base layer 301, which can make the heating film 300 generate heat evenly, increase the heating area, and improve the heat generation; by setting the reflective layer 400, the heat generated by the heating film 300 can be reflected to the user side, avoiding heat loss and improving heat utilization. By setting the temperature sensing element 100, the temperature of the heating film 300 can be detected, and when the temperature is too high, the power can be cut off for protection, thereby improving the safety of use.

[0043] In this embodiment, the flame retardant layer 200 can be made of flame retardant cloth, one side of which is adhesively backed and bonded to the heating film 300; by providing the flame retardant layer 200, safety accidents caused by excessive temperature of the heating film 300 can be avoided, thereby improving safety of use.

[0044] In this embodiment, the reflective layer 400 can be made of aluminum foil cloth, and one side of the aluminum foil cloth is glued on the heating film 300. The heat generated by the heating film 300 is reflected to the user side by the reflective layer 400. Figure 4 .

[0045] In this embodiment, the flexible layer 500 can be made of sponge, the thickness of the sponge can be 5mm, and the sponge has double-sided adhesive, one side of which is attached to the reflective layer 400, and the other side is attached to the product in use. The heat radiation sheet provided in this embodiment can be applied to products such as neck massagers, eye massagers, and moxibustion devices to play a role of hot compress.

[0046] In one embodiment of the present application, see Figure 5 The positive electrode includes a first wire portion 331 and a plurality of first electrode portions 332 arranged on the first wire portion 331; the negative electrode includes a second wire portion 333 and a plurality of second electrode portions 334 arranged on the second wire portion 333; the first wire portion 331 and the second wire portion 333 are arranged in parallel; the first electrode portion 332 and the second electrode portion 334 are arranged one by one in an interlaced manner in a finger shape.

[0047] In one embodiment of the present application, see Figure 5 , the positive electrode and the negative electrode are located on the same surface of the base layer 301 ; the width of the first electrode portion 332 and the second electrode portion 334 located at both ends of the base layer 301 is greater than the width of the first electrode portion 332 and the second electrode portion 334 located in the middle of the base layer 301 .

[0048] It can be understood that the wider the width of the electrode, the larger the contact area with the heating layer, and thus the higher the heat generated. Therefore, this embodiment increases the width of the first electrode portion 332 and the second electrode portion 334 located at both ends of the base layer 301 to increase the heat at both ends of the heating film 300, so that the entire area of ​​the heating film 300 can generate heat more evenly.

[0049] In one embodiment of the present application, please refer to Figure 6 and Figure 7 The positive electrode includes a first wire portion 331, and the negative electrode includes a second wire portion 333. The first wire portion 331 and the second wire portion 333 are arranged in parallel; the heating layer has a heating area 302, the heating area 302 is strip-shaped, one end of the heating area 302 is connected to the first wire portion 331, and the other end of the heating area 302 is connected to the second wire portion 333.

[0050] In one embodiment of the present application, please refer to Figure 6 and Figure 7 There are multiple heating zones 302 , and the multiple heating zones 302 are arranged at intervals along the length direction of the first wire portion 331 .

[0051] In this embodiment, the heating layer may be made of graphene conductive material. By providing the heating layer, the positive electrode and the negative electrode can be connected, thereby achieving heating of the heating film 300.

[0052] In another embodiment of the present application, see Figure 6 The positive electrode and the negative electrode are located on the same surface of the base layer 301, the first wire portion 331 and the second wire portion 333 located at both ends of the base layer 301 are curved, and the first wire portion 331 and the second wire portion 333 located in the middle of the base layer 301 are straight.

[0053] In this embodiment, by making the first wire portion 331 and the second wire portion 333 located at the two ends of the base layer 301 into a curved shape, the contact area between the first wire portion 331 and the second wire portion 333 and the conductive material on the base layer 301 can be increased, thereby increasing the heat generation at both ends of the heating film 300, making the heat generation at both ends of the heating film 300 roughly the same as the heat generation in the middle of the heating film 300, thereby improving the uniformity of heat generation.

[0054] In another embodiment of the present application, please refer to Figure 7 The positive electrode is arranged on the front side of the base layer 301, and the negative electrode is arranged on the back side of the base layer 301; one end of the heating layer is connected to the first wire portion 331, and the other end of the heating layer extends through the front and side surfaces of the base layer 301 to the back side of the base layer 301, and is connected to the second wire portion 333.

[0055] In this embodiment, by spreading the heating layer over the front and back surfaces of the base layer 301 , the heating area can be increased without increasing the size of the base layer 301 . Compared with setting the positive and negative electrodes on the same surface of the base layer 301 , twice the radiation area can be obtained.

[0056] In another embodiment of the present application, please refer to Figure 7 A conductive portion is provided on the side of the base layer 301, and the conductive portion is used to conduct the heating layer located on the front side with the heating layer located on the back side. Figure 7 The area indicated by A represents the side surface of the base layer 301 .

[0057] It can be understood that the heating layer is generally coated on the front and back surfaces of the base layer 301 by printing. Therefore, the base layer 301 may have a non-conducting problem. This embodiment can solve this problem well by providing a conductive cloth on the side of the base layer 301; specifically, the conductive part can adopt a conductive metal coating such as a Cu layer or an Ag layer.

[0058] In one embodiment of the present application, see Figure 1 The reflective layer 400 is provided with an avoidance groove 401 , which penetrates the upper surface and the lower surface of the reflective layer 400 ; the temperature sensing element 100 is arranged in the avoidance groove 401 .

[0059] In this embodiment, by providing the avoidance groove 401 on the reflective layer 400 , the installation of the temperature sensing element 100 can be facilitated without increasing the overall thickness of the heat radiation sheet.

[0060] In one embodiment of the present application, the temperature sensing element 100 is an NTC temperature sensor.

[0061] Understandably, please also refer to Figure 2 and Figure 3 The heat radiation sheet also includes a cable bundle 600 and a connector 700. One end of the cable bundle 600 is connected to the connector 700, and the other end of the cable bundle 600 is used to connect the positive electrode, the negative electrode and the temperature sensing element 100. The cable bundle 600 includes an NTC1 wire, an NTC2 wire, a HEAT1 wire and a HEAT2 wire arranged in sequence; the NTC1 wire and the NTC2 wire are used to connect the temperature sensing element 100, and the HEAT1 wire and the HEAT2 wire are used to connect the positive electrode and the negative electrode respectively. The connector 700 can be 4PIN-1.25, and the outer side is wrapped with a plastic layer.

[0062] Embodiment 1

[0063] See also Figure 5In this embodiment, the positive electrode includes a first wire portion 331 and a plurality of first electrode portions 332 disposed on the first wire portion 331; the negative electrode includes a second wire portion 333 and a plurality of second electrode portions 334 disposed on the second wire portion 333; the first wire portion 331 and the second wire portion 333 are disposed in parallel; the first electrode portions 332 and the second electrode portions 334 are disposed alternately in a forked finger shape. The positive electrode and the negative electrode are located on the same surface of the base layer 301; the widths of the first electrode portions 332 and the second electrode portions 334 located at both ends of the base layer 301 are greater than the widths of the first electrode portions 332 and the second electrode portions 334 located in the middle of the base layer 301.

[0064] In this embodiment, the width of the first electrode portion 332 and the second electrode portion 334 at the two ends of the base layer 301 is increased to increase the heat at the two ends of the heating film 300 , so that the heating of the entire heating film 300 can be made more uniform.

[0065] Embodiment 2

[0066] See also Figure 6 In this embodiment, the positive electrode includes a first wire portion 331, the negative electrode includes a second wire portion 333, the first wire portion 331 and the second wire portion 333 are arranged in parallel; the heating layer has a heating area 302, the heating area 302 is strip-shaped, one end of the heating area 302 is connected to the first wire portion 331, and the other end of the heating area 302 is connected to the second wire portion 333. There are multiple heating areas 302, and the multiple heating areas 302 are arranged at intervals along the length direction of the first wire portion 331.

[0067] The positive electrode and the negative electrode are located on the same surface of the base layer 301. The first wire portion 331 and the second wire portion 333 located at both ends of the base layer 301 are curved, and the first wire portion 331 and the second wire portion 333 located in the middle of the base layer 301 are straight.

[0068] In this embodiment, by making the first wire portion 331 and the second wire portion 333 located at the two ends of the base layer 301 into a curved shape, the contact area between the first wire portion 331 and the second wire portion 333 and the heating layer (the heating layer uses graphene conductive material) can be increased, thereby increasing the heat generation at both ends of the heating film 300, making the heat generation at both ends of the heating film 300 roughly the same as the heat generation in the middle of the heating film 300, thereby improving the uniformity of heat generation.

[0069] Embodiment 3

[0070] See also Figure 7In this embodiment, the positive electrode includes a first wire portion 331, and the negative electrode includes a second wire portion 333, and the first wire portion 331 and the second wire portion 333 are arranged in parallel; the heating layer has a heating area 302 in a strip shape, one end of the heating area 302 is connected to the first wire portion 331, and the other end of the heating area 302 is connected to the second wire portion 333. There are multiple heating areas 302, and the multiple heating areas 302 are arranged at intervals along the length direction of the first wire portion 331. The positive electrode is arranged on the front side of the base layer 301, and the negative electrode is arranged on the back side of the base layer 301; one end of the heating layer is connected to the first wire portion 331, and the other end of the heating layer extends to the back side of the base layer 301 through the front and side surfaces of the base layer 301, and is connected to the second wire portion 333.

[0071] In this embodiment, by spreading the heating layer over the front and back surfaces of the base layer 301 , the heating area can be increased without increasing the size of the base layer 301 . Compared with setting the positive and negative electrodes on the same surface of the base layer 301 , twice the radiation area can be obtained.

[0072] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A heat radiating sheet, characterized in that: It comprises a temperature sensing element and a flame retardant layer, a heating film, a reflective layer and a flexible layer stacked in sequence; the temperature sensing element is connected to the heating film; the heating film comprises a base layer, a heating layer, a positive electrode and a negative electrode; the heating layer is stacked with the base layer, and the heating layer is connected to the positive electrode and the negative electrode; The areas of the positive electrode and the negative electrode at the two ends of the base layer are larger than those of the positive electrode and the negative electrode at the middle of the base layer, and the positive electrode and the negative electrode are located on the same surface of the base layer; Alternatively, the positive electrode and the negative electrode are respectively located on the front and back surfaces of the substrate layer.

2. The heat radiating sheet according to claim 1, characterized in that: The positive electrode includes a first wire portion and a plurality of first electrode portions arranged on the first wire portion; the negative electrode includes a second wire portion and a plurality of second electrode portions arranged on the second wire portion; the first wire portion and the second wire portion are arranged in parallel; the first electrode portions and the second electrode portions are arranged one by one in an interlaced manner in a finger shape.

3. The heat radiating sheet according to claim 2, characterized in that: The positive electrode and the negative electrode are located on the same surface of the base layer; the widths of the first electrode portion and the second electrode portion located at both ends of the base layer are greater than the widths of the first electrode portion and the second electrode portion located in the middle of the base layer.

4. The heat radiating sheet according to claim 1, characterized in that: The positive electrode includes a first wire portion, the negative electrode includes a second wire portion, and the first wire portion and the second wire portion are arranged in parallel; The heating layer has a heating area, the heating area is in a strip shape, one end of the heating area is connected to the first wire portion, and the other end of the heating area is connected to the second wire portion.

5. The heat radiating sheet according to claim 4, characterized in that: There are a plurality of heating zones, and the plurality of heating zones are arranged at intervals along the length direction of the first wire portion.

6. The heat radiating sheet according to claim 5, characterized in that: The positive electrode and the negative electrode are located on the same surface of the base layer, the first wire portion and the second wire portion located at both ends of the base layer are curved, and the first wire portion and the second wire portion located in the middle of the base layer are straight.

7. The heat radiating sheet according to claim 5, characterized in that: The positive electrode is arranged on the front side of the base layer, and the negative electrode is arranged on the back side of the base layer; one end of the heating layer is connected to the first wire portion, and the other end of the heating layer extends through the front and side surfaces of the base layer to the back side of the base layer and is connected to the second wire portion.

8. The heat radiating sheet according to claim 7, characterized in that: The side surface is provided with a conductive part, and the conductive part is used to conduct the heat generating layer located on the front surface with the heat generating layer located on the back surface.

9. The heat radiating sheet according to claim 1, characterized in that: The reflective layer is provided with an avoidance groove, and the avoidance groove penetrates the upper surface and the lower surface of the reflective layer; the temperature sensing element is arranged in the avoidance groove.

10. The heat radiating sheet according to claim 1, characterized in that: The temperature sensing element is an NTC temperature sensor.

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