Heating pad

Abstract

The utility model provides a heating pad. The heating pad comprises a base material, a flexible circuit board body, a heating member and a conductive assembly. The flexible circuit board body is arranged on the base material; the flexible circuit board body is provided with a first conductor part and a second conductor part; the first conductor part is provided with at least one first wiring area exposed on the surface of the flexible circuit board body; the second conductor part is provided with at least one second wiring area exposed on the surface of the flexible circuit board body; the first wiring area is electrically connected with a power supply anode, and the second wiring area is electrically connected with a power supply cathode; the conductive assembly is connected to the first wiring area and the second wiring area; the two ends of the heating piece are connected with the conductive assembly through the first wiring area and the second wiring area correspondingly and used for generating heat after being powered on. In this way, the integration level of the heating piece is improved, and the terminal welding process is omitted; therefore, electric connection can be realized in the circuit board processing process, hard spots are avoided, connection with other elements is facilitated, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model generally relates to the technical field of automobile cabin heating, and in particular to a heating pad. Background Art

[0002] As an important part of the car, the car interior has more and more functions. For example, seat heating pads are added to the car seats to achieve heating and massage functions, heating pads are added to small interiors such as armrests and steering wheels to achieve heating functions, and heating pads can also be set in the cabin carpet and ceiling to achieve cabin heating functions.

[0003] In the existing heating device of the interior heating pad, the heating element and the wiring harness need to be electrically connected by terminal welding and fixed on the substrate. This method has low connection efficiency and will produce hard points at the welding position. When the assembly area is small, the size of the hard point itself remains unchanged, so the proportion of occupied space becomes higher, which makes it inconvenient to connect the heating element, wiring harness and other components. Utility Model Content

[0004] In view of the above defects or deficiencies in the prior art, it is desirable to provide a heating pad.

[0005] The utility model provides a heating pad, comprising:

[0006] Base material;

[0007] A flexible circuit board body, wherein the flexible circuit board body is arranged on the substrate; the flexible circuit board body is provided with a first conductor portion and a second conductor portion; the first conductor portion has at least one first wiring area exposed on the surface of the flexible circuit board body; the second conductor portion has at least one second wiring area exposed on the surface of the flexible circuit board body;

[0008] The first wiring area is electrically connected to the positive electrode of the power supply, and the second wiring area is electrically connected to the negative electrode of the power supply;

[0009] A conductive component connected to the first wiring area and the second wiring area;

[0010] A heating element, wherein both ends of the heating element are connected to the conductive component through the first wiring area and the second wiring area respectively, and is used to generate heat after being powered on.

[0011] According to the technical solution provided by the utility model, the first conductor part has a first wiring area, and the first conductor part is set on the flexible circuit board body by printing; and / or the first conductor part has a second wiring area, and the first conductor part is set on the flexible circuit board body by printing.

[0012] According to the technical solution provided by the utility model, the first conductor part has two first wiring areas, the two first wiring areas are respectively exposed on different surfaces of the flexible circuit board body, and at least partially overlap along the direction perpendicular to the surface of the flexible circuit board body; and / or the second conductor part has two second wiring areas, the two second wiring areas are respectively exposed on different surfaces of the flexible circuit board body, and the two second wiring areas at least partially overlap along the direction perpendicular to the surface of the flexible circuit board body.

[0013] According to the technical solution provided by the utility model, a thermistor is also installed on the flexible circuit board body. The thermistor is arranged close to the first conductor part or the second conductor part and is used to detect the temperature at the first conductor part or the second conductor part.

[0014] According to the technical solution provided by the utility model, a thermistor is also installed on the flexible circuit board body, and the thermistor is arranged close to the heating element to detect the temperature at the heating element.

[0015] According to the technical solution provided by the utility model, at least one end of the thermistor is used to be electrically connected to the control module.

[0016] According to the technical solution provided by the utility model, the thermistor is a chip thermistor;

[0017] The flexible circuit board body is also provided with a protruding portion; the chip thermistor is mounted on the protruding portion.

[0018] According to the technical solution provided by the utility model, a capacitor is also provided on the flexible circuit board body, and the two ends of the capacitor are electrically connected to the positive electrode and the negative electrode of the power supply respectively, so as to eliminate the parasitic oscillation electromagnetic waves generated by the heating element.

[0019] According to the technical solution provided by the utility model, a temperature controller is also installed on the flexible circuit board body; one end of the temperature controller is connected to the first wiring area or the second wiring area, and the other end is connected to the heating element, and is used to cut off the electrical connection between the heating element and the power supply when the temperature of the heating element exceeds a set value.

[0020] According to the technical solution provided by the utility model, a positioning mark is provided on the substrate;

[0021] The flexible circuit board body is provided with a positioning groove, and the positioning groove is used to align with the positioning mark to fix the relative position of the flexible circuit board body and the substrate.

[0022] The beneficial effects of the utility model are:

[0023] The heating element and the flexible circuit board body are arranged on the substrate, the heating element is electrically connected to the flexible circuit board body, and is electrically connected to the conductive component through the flexible circuit board body. The flexible circuit board body has a first conductor part and a second conductor part, the first conductor part and the second conductor part respectively have a first wiring area and a second wiring area, the first wiring area is the first conductor part exposed on the outer surface of the flexible circuit board, and the second wiring area is the second conductor part exposed on the outer surface of the flexible circuit board; the heating element is electrically connected to the power supply through the first wiring area, the second wiring area on the flexible circuit board body and the conductive component connected to the flexible circuit board; the first wiring area and the second wiring area can directly connect the heating element to the flexible circuit board body, improve the integration of the heating element, save the terminal welding process; thus, the electrical connection can be achieved by using the process of processing the circuit board, avoiding the generation of hard points, facilitating connection with other components, and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0025] Figure 1 A schematic diagram of the structure of a heating pad connected to a control module provided by the utility model;

[0026] Figure 2 It is a schematic diagram of two first wiring areas partially overlapping along a direction perpendicular to the flexible circuit board body;

[0027] Figure 3 is a schematic diagram of the exposed connection area of ​​the first conductor part and the second conductor part in the first case;

[0028] Figure 4 is a schematic diagram of the exposed connection area of ​​the first conductor part and the second conductor part in the second case;

[0029] Figure 5 is a schematic diagram of the exposed connection area of ​​the first conductor part and the second conductor part in the third case;

[0030] Figure 6 It is a schematic diagram of the thermistor and the heating element sharing the negative electrode;

[0031] Figure 7 It is a schematic diagram of the thermistor and the heating element sharing the positive electrode;

[0032] Figure 8 It is a schematic diagram of connecting the positive and negative electrodes of the thermistor and the heating element respectively;

[0033] Fig. 9 It is a schematic diagram of a lead type thermistor;

[0034] Fig.10It is a schematic diagram of a chip thermistor;

[0035] Fig.11 is a schematic diagram of another protrusion;

[0036] Fig.12 is a schematic diagram of a capacitor;

[0037] Fig.13 It is a structural schematic diagram of a heating pad connected to a control module in another embodiment;

[0038] Fig.14 A schematic diagram of a positioning mark;

[0039] Fig.15 for Figure 8 A cross-sectional view of

[0040] Among them: 1. Flexible circuit board body; 2. Base material; 3. Heating element; 4. Thermistor; 5. Temperature controller; 6. Lead type thermistor; 7. Chip type thermistor; 8. First conductor part; 9. Second conductor part; 10. Ground wire; 11. First wiring area; 12. Second wiring area; 13. Protrusion; 14. Control module; 15. Capacitor; 16. Positioning mark; 17. Positioning groove; 18. Thermistor wiring area; 19. Conductor assembly. DETAILED DESCRIPTION

[0041] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0042] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0043] Please refer to Figure 1-15 , is a schematic diagram of a heating pad connection control module provided by the utility model, including:

[0044] Substrate 2;

[0045] A flexible circuit board body 1, wherein the flexible circuit board body 1 is disposed on the substrate 2; the flexible circuit board body 1 is provided with a first conductor portion 8 and a second conductor portion 9; the first conductor portion 8 has at least one first wiring area 11 exposed on the surface of the flexible circuit board body 1; the second conductor portion 9 has at least one second wiring area 12 exposed on the surface of the flexible circuit board body 1;

[0046] The first wiring area 11 is electrically connected to the positive electrode of the power supply, and the second wiring area 12 is electrically connected to the negative electrode of the power supply;

[0047] A conductive component 19, wherein the conductive component 19 is connected to the first wiring area 11 and the second wiring area 12;

[0048] The heating element 3 has two ends connected to the conductive component 19 through the first wiring area 11 and the second wiring area 12 respectively, and is used to generate heat after being powered on.

[0049] Specifically, the first conductor portion 8 and the second conductor portion 9 can be embedded in the flexible circuit board body 1, referring to Figure 8 and Fig.15 , Fig.15 The dotted line portion in the middle represents the first conductor part 8, and the structures on both sides represent the flexible circuit board body 1. The flexible circuit board body 1 sandwiches the first conductor part 8 in the middle, and exposes the first wiring area 11 by opening a square frame. Figure 8 The middle arrow indicates the sectioning symbol.

[0050] Specifically, the flexible circuit board body 1 is a flexible printed circuit board (FPC), which is made of polyimide or polyester film as a substrate and has high reliability and excellent flexibility. It has the characteristics of high wiring density, light weight and thin thickness. The conductive component 19 can use a conductive wire harness to achieve electrical conduction and allow current to pass through.

[0051] In some embodiments, the flexible circuit board body 1 is conveniently arranged on a substrate 2 made of a flexible material and then installed on a car seat, and can produce an appropriate amount of deformation to adapt to the shape of the seat and the human body, thereby improving riding comfort.

[0052] In some embodiments, the heating pad can be disposed on the interior decoration of the vehicle cabin, such as the vehicle seat, steering wheel, armrest, carpet, ceiling, etc.

[0053] The utility model designs the wiring mode of the heating element 3 in the form of an integrated circuit board, thereby improving the integration of the heating element and saving the terminal welding process; the electrical connection can be achieved by utilizing the process of processing the circuit board, thus avoiding the generation of hard points, facilitating connection with other components and improving production efficiency.

[0054] Meanwhile, the end of the heating element 3 is arranged on the flexible circuit board body 1, and the longer middle part of the heating element 3 is arranged on the substrate 2. When the heating element 3 or the flexible circuit board body 1 fails, a new heating element 3 or the flexible circuit board body 1 can be directly replaced separately, and the replacement process is more convenient.

[0055] In some embodiments, a covering layer is provided on the flexible circuit board body 1 to protect the circuit structures on the flexible circuit board body 1 from wear and tear and short circuit caused by water.

[0056] Specifically, refer to Figure 3-5 , respectively representing the combination of the exposed wiring areas of the first conductor part 8 and the second conductor part 9.

[0057] Furthermore, the first conductor portion 8 has a first wiring area 11, and the first conductor portion 8 is set on the flexible circuit board body 1 by printing; and / or the second conductor portion 9 has a second wiring area 12, and the second conductor portion 9 is set on the flexible circuit board body 1 by printing.

[0058] In some embodiments, the conductor part uses one wiring area to electrically connect with other electrical components, which can reduce the number of wiring areas and thus reduce space occupation.

[0059] Further, refer to Figure 2 , the dotted line indicates the other surface.

[0060] The first conductor portion 8 has two first wiring areas 11, the two first wiring areas 11 are respectively exposed on different surfaces of the flexible circuit board body 1, and at least partially overlap along a direction perpendicular to the surface of the flexible circuit board body 1; and / or the second conductor portion 9 has two second wiring areas 12, the two second wiring areas 12 are respectively exposed on different surfaces of the flexible circuit board body 1, and the two second wiring areas 12 at least partially overlap along a direction perpendicular to the surface of the flexible circuit board body 1.

[0061] In some embodiments, the two wiring areas of the conductor part are respectively arranged on different surfaces of the flexible circuit board body 1, which increases the space utilization and thus reduces the space occupation.

[0062] Furthermore, a thermistor 4 is installed on the flexible circuit board body 1 . The thermistor 4 is arranged close to the first conductor part 8 or the second conductor part 9 and is used to detect the temperature at the first conductor part 8 or the second conductor part 9 .

[0063] Figure 2 The thermistor connection area 18 can be arranged on any side of the flexible circuit board body 1 .

[0064] Furthermore, a thermistor 4 is mounted on the flexible circuit board body 1 . The thermistor 4 is disposed close to the heating element 3 and is used to detect the temperature of the heating element 3 .

[0065] In some embodiments, the thermistor 4 is arranged near the heating element 3, and can monitor the actual temperature of the heating element 3, generate a temperature detection signal and transmit it to the ECU (Electronic Control Unit), and the ECU controls the duty cycle of the voltage provided to the heating element 3 according to the temperature detection signal to adjust the temperature of the heating element 3.

[0066] In some embodiments, waterproof glue is used to protect the solder joints of the thermistor 4 and the flexible circuit board body 1. This method can ensure that the connection between the thermistor 4 and the flexible circuit board body 1 is sealed from the outside world, avoiding short circuits caused by water or oxidation of the circuit after long-term use, which may lead to circuit failures.

[0067] Furthermore, at least one end of the thermistor 4 is used to be electrically connected to the control module 14 .

[0068] In some embodiments, one end of the thermistor 4 is electrically connected to the positive electrode interface of the control module 14, and the other end shares a negative electrode with the heating element 3 and is connected to the negative electrode of the power supply or is grounded.

[0069] In some embodiments, one end of the thermistor 4 is electrically connected to the negative electrode interface of the control module 14, and the other end shares a positive electrode with the heating element 3 and is connected to the positive electrode of the power supply.

[0070] This method can save the space of a terminal and reduce the space occupied by the flexible circuit board body 1.

[0071] In some embodiments, one end of the thermistor 4 is electrically connected to the positive electrode interface of the control module 14 , and the other end is electrically connected to the negative electrode interface of the control module 14 .

[0072] At the same time, the thermistor 4 and the heating element 3 are connected to different circuits respectively, so that the thermistor 4 and the heating element 3 are independent of each other in circuit structure, thereby preventing the failure of one of them from affecting the normal operation of the other.

[0073] In some embodiments, the wiring areas of the thermistor 4 and the heater 3 are staggered with each other, which can facilitate distinguishing the wiring areas of the thermistor 4 and the heater 3 when processing the circuit of the flexible circuit board body 1, thereby reducing wiring errors.

[0074] Specifically, refer to Figure 6-8 , which is a schematic diagram of three connection modes of thermistor 4, indicating that thermistor 4 can be arranged in three different implementation modes according to actual needs. In the figure, GND represents ground wire 10.

[0075] Further, the thermistor 4 is a chip thermistor 7;

[0076] The flexible circuit board body 1 also has a protruding portion 13 ; the SMD thermistor 7 is mounted on the protruding portion 13 .

[0077] In some embodiments, the protrusion 13 can have a positioning function in conjunction with the shape of the heater 3. The heater 3 is bent on the substrate 2, and the bent portion can be used as a positioning mark 16 to locate the position of the protrusion 13, thereby locating the position of the flexible circuit board body 1.

[0078] Specifically, Fig.10 and Fig. 9 They represent chip thermistors and lead thermistors respectively. Both are thermistor components. Their main differences lie in the packaging form and application scenarios.

[0079] Chip thermistor is a surface mount packaged thermistor component. Due to the special nature of its packaging, it requires special chip mounting equipment for installation. Compared with lead thermistor, it has a smaller size and lower cost, and is very suitable for the design of high-density circuit boards, so it is widely used in the modern electronics industry.

[0080] Leaded thermistors are leaded thermistor components that are connected to the circuit board via leads. Compared with SMD thermistors, leaded thermistors have better stability and reliability, and are therefore more suitable for applications that require higher signal accuracy and response speed. For example, leaded thermistors are widely used in temperature measurement and control, power management, and other fields.

[0081] Specifically, Fig.11 A schematic structural diagram of the protrusion 13 in an embodiment is shown. When the flexible circuit board body 1 is actually prepared, the protrusion 13 can be designed into any shape according to requirements.

[0082] Further, refer to Fig.12 A capacitor 15 is also provided on the flexible circuit board body 1 , and two ends of the capacitor 15 are electrically connected to the positive electrode and the negative electrode of the power supply respectively, so as to eliminate the parasitic oscillation electromagnetic wave generated by the heating element 3 .

[0083] Specifically, since the heating pad is arranged around the human body, if the circuit therein generates strong parasitic oscillation electromagnetic waves, it will cause discomfort to the human body. Therefore, adding a capacitor 15 can eliminate the parasitic oscillation electromagnetic waves generated by the heating element 3 and reduce the adverse effects of the parasitic oscillation electromagnetic waves on the human body.

[0084] In some embodiments, there is a Fig.12 The heating pad of the flexible circuit board body 1 shown in the figure without thermistor is suitable for heating the backrest of an automobile seat, and is also suitable for a heating pad whose heating time is controlled by a controller.

[0085] Furthermore, a thermostat 5 is also installed on the flexible circuit board body 1; one end of the thermostat 5 is connected to the first wiring area 11 or the second wiring area 12, and the other end is connected to the heating element 3, and is used to cut off the electrical connection between the heating element 3 and the power supply when the temperature of the heating element 3 exceeds a set value.

[0086] In some embodiments, the thermostat 5 has a metal spring inside, and the metal spring has the characteristic of being deformed when heated. When the temperature is low, the metal spring electrically connects the first wiring area 11 and the second wiring area 12; when the temperature of the heating element 3 is too high and exceeds the deformation temperature of the metal spring, the metal spring is deformed to disconnect the electrical connection between the first wiring area 11 and the second wiring area 12.

[0087] The set value is specifically the deformation temperature of the metal spring, and a metal spring that deforms at 37-43 degrees or 47-53 degrees can be selected to ensure that the heating temperature of the heating element 3 is not too high, thereby avoiding scalding passengers sitting on the car seat equipped with a heating circuit board.

[0088] refer to Fig.13 , Battery indicates that the positive pole of the power supply is turned on. In the figure, the first wiring area 11 and the second wiring area 12 can be set on the side close to each other. The thermistor 4 is set close to the second conductor part 9. The control module can detect the temperature of the second conductor part 9 and calculate and determine the actual temperature of the heating element 3 according to parameters such as the width, thickness, and heating coefficient of the second conductor part 9.

[0089] The overlapping parts of the second conductor part 9 and the thermistor 4 are respectively arranged on different outer surfaces of the flexible circuit board body 1 to save space.

[0090] Further, refer to Fig.14 , a positioning mark 16 is provided on the substrate 2;

[0091] The flexible circuit board body 1 is provided with a positioning groove 17 , and the positioning groove 17 is used to align with the positioning mark 16 to fix the relative position of the flexible circuit board body 1 and the substrate 2 .

[0092] In some embodiments, the positioning mark 16 and the positioning groove 17 are used in conjunction with each other to facilitate the flexible circuit board body 1 and the heating element 3 to be quickly installed on the substrate 2.

[0093] Specifically, the positioning mark 16 can be a hole opened on the substrate 2, an embroidered mark or a drawn pattern; the positioning groove 17 can be opened at the edge of the flexible circuit board body 1 or at a position where no circuit structure is set inside the flexible circuit board body 1, and the number is at least one.

[0094] Preferably, the positioning grooves 17 are two notches opened at the edge of the flexible circuit board body 1 .

[0095] Preferably, the positioning grooves 17 are two holes which are opened at a position where no circuit structure is arranged inside the flexible circuit board body 1 and are relatively far apart.

[0096] The above description is only a preferred embodiment of the utility model and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the utility model is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in the utility model (but not limited to) by each other to form a technical solution.

Claims

1. A heating pad, characterized in that: include: Substrate (2); A flexible circuit board body (1), wherein the flexible circuit board body (1) is arranged on the substrate (2); the flexible circuit board body (1) is provided with a first conductor part (8) and a second conductor part (9); the first conductor part (8) has at least one first wiring area (11) exposed on the surface of the flexible circuit board body (1); the second conductor part (9) has at least one second wiring area (12) exposed on the surface of the flexible circuit board body (1); The first wiring area (11) is electrically connected to the positive electrode of the power supply, and the second wiring area (12) is electrically connected to the negative electrode of the power supply; A conductive component (19), the conductive component (19) being connected to the first wiring area (11) and the second wiring area (12); A heating element (3), wherein two ends of the heating element (3) are respectively connected to the conductive component (19) via the first wiring area (11) and the second wiring area (12), and is used to generate heat after being powered on.

2. A heating pad according to claim 1, characterized in that: The first conductor part (8) has a first wiring area (11), and the first conductor part (8) is arranged on the flexible circuit board body (1) in a printing manner; and / or the second conductor part (9) has a second wiring area (12), and the second conductor part (9) is arranged on the flexible circuit board body (1) in a printing manner.

3. A heating pad according to claim 1, characterized in that: The first conductor part (8) has two first wiring areas (11), the two first wiring areas (11) are respectively exposed on different surfaces of the flexible circuit board body (1), and at least partially overlap along a direction perpendicular to the surface of the flexible circuit board body (1); and / or the second conductor part (9) has two second wiring areas (12), the two second wiring areas (12) are respectively exposed on different surfaces of the flexible circuit board body (1), and at least partially overlap along a direction perpendicular to the surface of the flexible circuit board body (1).

4. A heating pad according to claim 1, characterized in that: A thermistor (4) is also mounted on the flexible circuit board body (1); the thermistor (4) is arranged close to the first conductor part (8) or the second conductor part (9) and is used to detect the temperature at the first conductor part (8) or the second conductor part (9).

5. A heating pad according to claim 1, characterized in that: A thermistor (4) is also mounted on the flexible circuit board body (1); the thermistor (4) is arranged close to the heating element (3) and is used to detect the temperature at the heating element (3).

6. A heating pad according to claim 4 or 5, characterized in that: At least one end of the thermistor (4) is used for being electrically connected to the control module (14).

7. A heating pad according to claim 4 or 5, characterized in that: The thermistor (4) is a chip thermistor (7); The flexible circuit board body (1) also has a protruding portion (13); the chip-type thermistor (7) is mounted on the protruding portion (13).

8. A heating pad according to claim 1, characterized in that: The flexible circuit board body (1) is also provided with a capacitor (15), and two ends of the capacitor (15) are respectively electrically connected to the positive electrode and the negative electrode of the power supply, so as to eliminate the parasitic oscillation electromagnetic wave generated by the heating element (3).

9. A heating pad according to claim 1, characterized in that: A temperature controller (5) is also installed on the flexible circuit board body (1); one end of the temperature controller (5) is connected to the first wiring area (11) or the second wiring area (12), and the other end is connected to the heating element (3), and is used to cut off the electrical connection between the heating element (3) and the power supply when the temperature of the heating element (3) exceeds a set value.

10. A heating pad according to claim 1, characterized in that: The substrate (2) is provided with a positioning mark (16); The flexible circuit board body (1) is provided with a positioning groove (17), and the positioning groove (17) is used to align with the positioning mark (16) to fix the relative position of the flexible circuit board body (1) and the substrate (2).

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