heating mat

Abstract

Heating mat, characterized in that the heating mat comprises the following: a substrate (2); a flexible printed circuit board body (1), wherein the flexible printed circuit board body (1) is arranged on the substrate (2); wherein the flexible printed circuit board body (1) is provided with a first conductor section (8) and a second conductor section (9); wherein the first conductor section (8) has at least one first wiring zone (11) exposed on a surface of the flexible printed circuit board body (1); and wherein the second conductor section (9) has at least one second wiring zone (12) exposed on a surface of the flexible printed circuit board body (1); wherein the first wiring zone (11) is electrically connected to a positive terminal of a power supply and the second wiring zone (12) is electrically connected to a negative terminal of the power supply; an electrically conductive assembly (19), wherein the electrically conductive assembly (19) is connected to the first wiring zone (11) and the second wiring zone (12); a heating element (3), wherein both ends of the heating element (3) are connected to the electrically conductive assembly (19) via the first wiring zone (11) and the second wiring zone (12) respectively, in order to generate heat after the power supply is switched on.

Description

TECHNICAL AREA

[0001] The present utility model relates generally to a technical field of heating vehicle cabins, in particular a heating mat. STATE OF THE ART

[0002] Since the interior of a vehicle serves as an essential component, more and more functions are required. For example, a heated seat mat is often integrated into a vehicle seat to provide functions such as heating, massage, and the like. Similarly, small interior components like armrests and steering wheels also have heated mats to provide heating, and cabin carpets and roofs often contain heated mats to provide cabin heating.

[0003] In an existing heating system for interior heating mats, an electrical connection between a heating element and a wire bundle must be achieved by welding, and the heating element and wire bundle must be fixed to a substrate. This type of connection is less efficient and can result in hard spots at the weld points. With a smaller mounting area, the size of the hard spot itself remains unchanged, and consequently, the required space becomes proportionally large, which further complicates the connection of the heating element, the wire bundle, and other components. ILLUSTRATION OF THE USE SAMPLE

[0004] In view of the aforementioned defects or shortcomings in the state of the art, it is desirable to provide a heating mat.

[0005] The present utility model provides a heating mat comprising the following: a substrate; a flexible printed circuit board body, wherein the flexible printed circuit board body is arranged on the substrate; wherein the flexible printed circuit board body is provided with a first conductor section and a second conductor section; wherein the first conductor section has at least one first wiring zone exposed on a surface of the flexible printed circuit board body; and wherein the second conductor section has at least one second wiring zone exposed on a surface of the flexible printed circuit board body; wherein the first wiring zone is electrically connected to a positive terminal of a power supply and the second wiring zone is electrically connected to a negative terminal of the power supply; an electrically conductive assembly, wherein the electrically conductive assembly is connected to the first wiring zone and the second wiring zone; a heating element, wherein both ends of the heating element are connected to the electrically conductive assembly via the first wiring zone and the second wiring zone respectively, in order to generate heat when the power supply is switched on.

[0006] According to a technical solution provided by the present utility model, the first conductor section has a single first wiring zone, wherein the first conductor section is arranged on the flexible printed circuit board body by means of a printing process; and / or the second conductor section has a single second wiring zone, wherein the second conductor section is arranged on the flexible printed circuit board body by means of a printing process.

[0007] According to a technical solution provided by the present utility model, the first conductor section has two first wiring zones, wherein the two first wiring zones are each exposed on different surfaces of the flexible printed circuit board body and overlap at least partially in a direction perpendicular to the surface of the flexible printed circuit board body; and / or the second conductor section has two second wiring zones, wherein the two second wiring zones are each exposed on different surfaces of the flexible printed circuit board body and overlap at least partially in a direction perpendicular to the surface of the flexible printed circuit board body.

[0008] According to a technical solution provided by the present utility model, a thermistor is further mounted on the flexible printed circuit board body, wherein the thermistor is arranged near the first conductor section or the second conductor section in order to detect the temperature at the first conductor section or the second conductor section.

[0009] According to a technical solution provided by the present utility model, a thermistor is further mounted on the flexible printed circuit board body, wherein the thermistor is arranged near the heating element in order to detect the temperature at the heating element.

[0010] According to a technical solution provided by the present utility model, at least one end of the thermistor is used for electrical connection with a control module.

[0011] According to a technical solution provided by the present utility model, the thermistor is a chip thermistor; wherein a projection is further provided on the flexible printed circuit board body; and the chip thermistor is mounted on the projection.

[0012] According to a technical solution provided by the present utility model, a capacitor is further arranged on the flexible printed circuit board body, wherein both ends of the capacitor are electrically connected to the positive terminal of the power supply and the negative terminal of the power supply, respectively, in order to eliminate the parasitic oscillating electromagnetic waves generated by the heating element.

[0013] According to a technical solution provided by the present utility model, a thermostat is further mounted on the flexible printed circuit board body; wherein one end of the thermostat is connected to the first wiring zone or the second wiring zone and the other end is connected to the heating element in order to disconnect the electrical connection between the heating element and the power supply when the temperature of the heating element exceeds a setpoint.

[0014] According to a technical solution provided by the present utility model, a positioning mark is provided on the substrate; wherein a positioning groove is arranged on the flexible printed circuit board body, wherein the positioning groove is used to align with the positioning marker in order to fix a relative position of the flexible printed circuit board body to the substrate.

[0015] The present utility model has the following advantageous effects: The heating element and the flexible printed circuit board body are arranged on the substrate, with the heating element being electrically connected to the flexible printed circuit board body and electrically connected to the electrically conductive assembly via the flexible printed circuit board body. The flexible printed circuit board body has a first conductor section and a second conductor section, wherein the first conductor section and the second conductor section each have a first wiring zone and a second wiring zone, respectively. The first wiring zone of the first conductor section is exposed on an outer surface of the flexible printed circuit board, and the second wiring zone of the second conductor section is also exposed on an outer surface of the flexible printed circuit board.The heating element is electrically connected to the power supply via the first wiring zone, the second wiring zone on the flexible printed circuit board (PCB) body, and the electrically conductive assembly connected to the PCB. The first and second wiring zones can connect the heating element directly to the PCB body, improving heating element integration and eliminating the need for connection welding. This allows for electrical connection to be achieved through a single PCB processing step, avoiding the creation of hard points, facilitating connections with other components, and improving production efficiency. BRIEF DESCRIPTION OF THE FIGURES

[0016] Further features, functions, and advantages of the present utility model will become clearer by reading the detailed description of the non-restrictive embodiments with reference to the following accompanying drawings. These show: Fig. 1 a structural schematic representation in which a heating mat provided by the present utility model is connected to a control module; Fig. 2 a schematic representation in which two first wiring zones partially overlap in a direction perpendicular to the flexible printed circuit board body; Fig. 3 a schematic representation of the exposed wiring zones of a first conductor section and a second conductor section in a first case; Fig. 4 a schematic representation of the exposed wiring zones of the first conductor section and the second conductor section in a second case; Fig. 5 a schematic representation of the exposed wiring zones of the first conductor section and the second conductor section in a third case; Fig. 6 a schematic representation in which the thermistor shares a negative terminal with a heating element; Fig. 7 a schematic representation in which the thermistor shares a positive terminal with the heating element; Fig. 8 a schematic representation in which the thermistor and the heating element are connected to the positive terminal and the negative terminal respectively; Fig. 9 a schematic representation of a pin thermistor; Fig. 10 a schematic representation of a chip thermistor; Fig. 11 a schematic representation of another projection; Fig. 12 a schematic representation of a capacitor; Fig. 13 a structural schematic representation in which the heating mat is connected to the control module as described in another embodiment; Fig. 14 a schematic representation of a positioning sign; Fig. 15 a sectional view from Fig. 8. Reference symbol list: 1 flexible printed circuit board body 2 Substrat 3 heating elements 4 Thermistor 5 Thermostat 6-pin thermistor 7 Chip Thermistor 8 first ladder section 9 second ladder section 10 Earthing conductor 11 first wiring zone 12 second wiring zone 13 lead 14 Control module 15 Capacitor 16 positioning markers 17 Positioning groove 18 Thermistor wiring zone 19 Ladder assembly DESCRIPTION OF THE EXECUTION FORMS

[0017] The present utility model is explained in more detail below in conjunction with the accompanying drawings and embodiments. It is understood that the specific embodiments described herein serve only to interpret the invention and do not constitute a limitation of this invention. It should also be noted that, for the sake of clarity, only the parts dependent on the invention are shown in the accompanying drawings.

[0018] It should be noted that the embodiments and features in the embodiments of this utility model may be combined with one another as long as there is no conflict. This utility model is explained in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0019] With reference to the Fig. Figures 1-15 show a structural schematic representation in which a heating mat provided by the present utility model is connected to a control module, the heating mat comprising the following: a substrate 2; a flexible printed circuit board body 1, wherein the flexible printed circuit board body 1 is arranged on the substrate 2; wherein the flexible printed circuit board body 1 is provided with a first conductor section 8 and a second conductor section 9; wherein the first conductor section 8 has at least a first wiring zone 11 which is exposed on a surface of the flexible printed circuit board body 1; and wherein the second conductor section 9 has at least a second wiring zone 12 which is exposed on a surface of the flexible printed circuit board body 1; wherein the first wiring zone 11 is electrically connected to a positive terminal of a power supply and the second wiring zone 12 is electrically connected to a negative terminal of the power supply; an electrically conductive assembly 19, wherein the electrically conductive assembly 19 is connected to the first wiring zone 11 and the second wiring zone 12; a heating element 3, wherein both ends of the heating element 3 are connected to the electrically conductive assembly 19 via the first wiring zone 11 and the second wiring zone 12, respectively, to generate heat after the power supply is switched on.

[0020] In particular, the first conductor section 8 and the second conductor section 9 can be embedded within the flexible printed circuit board body 1, with reference to the Fig. 8 and Fig. 15 the dashed part in the middle of Fig. 15 represents the first conductor section 8, and the structures on both sides represent the flexible printed circuit board body 1. The flexible printed circuit board body 1 encloses the first conductor section 8 in the middle, and the first wiring zone 11 is exposed by opening a square frame. The arrow in Fig. 8 represents a cut symbol.

[0021] In particular, the flexible printed circuit board body 1 is a flexible printed circuit board (FPC), where the flexible printed circuit board is an excellent, compliant printed circuit board made of polyimide or polyester film as a substrate with high reliability, and is characterized by high wiring density, low weight, and small thickness. The electrically conductive assembly 19 can use an electrically conductive wire bundle to achieve electrical conductivity for current flow.

[0022] In some embodiments, the flexible printed circuit board body 1 is lightly arranged on the substrate 2 made of flexible material before being mounted on a vehicle seat, allowing for a reasonable degree of deformation to adapt to the shape of the seat and the human body, thus improving the comfort of the ride.

[0023] In some embodiments, the heating mat can be arranged on an interior fitting within the vehicle cabin, e.g. in positions such as a vehicle seat, a steering wheel, an armrest, a carpet, a roof and the like.

[0024] In the present utility model, the heating element 3 is designed as an integrated printed circuit board with respect to its wiring, which improves the integration of the heating element and eliminates the need for connection welding. This allows an electrical connection to be achieved through a single process for processing the printed circuit board, thereby avoiding the creation of hard spots, facilitating connection with other elements, and improving production efficiency.

[0025] Simultaneously, the ends of the heating element 3 are arranged on the flexible printed circuit board body 1, and the longer central part of the heating element 3 is arranged on the substrate 2. In the event of a failure of the heating element 3 or the flexible printed circuit board body 1, they can be directly and separately replaced with a new heating element 3 or a new flexible printed circuit board body 1, thus making the replacement process more convenient.

[0026] In some embodiments, a cover layer is arranged on the flexible printed circuit board body 1 to protect the individual circuit structures on the flexible printed circuit board body 1 from abrasion and short circuits when in contact with water.

[0027] In particular, with reference to the Fig. Figures 3 to 5 show the combination of the exposed wiring zones of the first conductor section 8 and the second conductor section 9.

[0028] Furthermore, the first conductor section 8 has a single first wiring zone 11, wherein the first conductor section 8 is arranged on the flexible printed circuit board body 1 by means of a printing process; and / or the second conductor section 9 has a single second wiring zone 12, wherein the second conductor section 9 is arranged on the flexible printed circuit board body 1 by means of a printing process.

[0029] In some embodiments, a conductor section is electrically connected to other electrical elements via a wiring zone, thereby reducing the number of wiring zones and thus the space required.

[0030] The following refers to the Fig. 2. The situation on another surface is represented by the dashed line.

[0031] The first conductor section 8 has two first wiring zones 11, wherein the two first wiring zones 11 are each exposed on different surfaces of the flexible printed circuit board body 1 and overlap at least partially in a direction perpendicular to the surface of the flexible printed circuit board body 1; and / or the second conductor section 9 has two second wiring zones 12, wherein the two second wiring zones 12 are each exposed on different surfaces of the flexible printed circuit board body 1 and overlap at least partially in a direction perpendicular to the surface of the flexible printed circuit board body 1.

[0032] In some embodiments, the two wiring zones of the conductor section are each arranged on different surfaces of the flexible printed circuit board body 1, thereby increasing the space utilization and thus reducing the space required.

[0033] Furthermore, a thermistor 4 is mounted on the flexible circuit board body 1, wherein the thermistor 4 is arranged near the first conductor section 8 or the second conductor section 9 in order to detect the temperature at the first conductor section 8 or the second conductor section 9.

[0034] The thermistor wiring zone 18 in Fig. 2 can be arranged on any surface of the flexible printed circuit board body 1.

[0035] Furthermore, a thermistor 4 is mounted on the flexible circuit board body 1, wherein the thermistor 4 is arranged near the heating element 3 in order to detect the temperature at the heating element 3.

[0036] In some embodiments, the thermistor 4 is arranged near the heating element 3 and can monitor the actual temperature of the heating element 3, as well as generate a temperature sensing signal and transmit it to an ECU (Electronic Control Unit), wherein the ECU controls a duty cycle of the voltage supplied to the heating element 3 depending on the temperature sensing signal in order to regulate the temperature of the heating element 3.

[0037] In some embodiments, the position where the thermistor 4 is electrically connected to the flexible printed circuit board body 1 is protected by a solder joint using a waterproof adhesive. This ensures that the connection between the thermistor 4 and the flexible printed circuit board body 1 is sealed against the outside environment, thus preventing conductor failure caused by a short circuit upon contact with water or by oxidation of the conductor after prolonged use.

[0038] Furthermore, at least one end of the thermistor 4 is used for electrical connection with a control module 14.

[0039] In some embodiments, one end of the thermistor 4 is electrically connected to a positive terminal interface of the control module 14, and the other end shares the negative terminal with the heating element 3 to switch on the negative terminal of the power supply or the grounding wire.

[0040] In some embodiments, one end of the thermistor 4 is electrically connected to a negative terminal interface of the control module 14, and the other end shares the positive terminal with the heating element 3 to switch on the positive terminal of the power supply.

[0041] This approach can save space around a connector and reduce the space required by the flexible printed circuit board body 1.

[0042] In some embodiments, one end of the thermistor 4 is electrically connected to the positive terminal interface of the control module 14 and the other end is electrically connected to the negative terminal interface of the control module 14.

[0043] At the same time, the thermistor 4 and the heating element 3 are each connected with different lines, making the thermistor 4 and the heating element 3 independent of each other in the circuit structure, thus preventing the normal operation of the other from being affected if one of these two elements fails.

[0044] In some embodiments, the respective wiring zones of the thermistor 4 and the heating element 3 are arranged offset from each other, which facilitates the differentiation of the respective wiring zones of the thermistor 4 and the heating element 3 during the processing of the circuit of the flexible printed circuit board body 1 and reduces wiring errors.

[0045] In particular, with reference to the Fig. Figures 6 to 8 show schematic representations of the three connection types of the thermistor 4, indicating that the thermistor 4 can be arranged in one of three different embodiments depending on the actual requirements. GND represents a grounding conductor 10 in the figures.

[0046] Furthermore, thermistor 4 is a chip thermistor 7; wherein a projection 13 is further provided on the flexible circuit board body 1; and the chip thermistor 7 is mounted on the projection 13.

[0047] In some embodiments, the projection 13, in conjunction with the shape of the heating element 3, can have a positioning function. The heating element 3 is bent on the substrate 2, and the bent area can be used as a positioning marker 16 for positioning the projection 13 and thus for positioning the flexible printed circuit board body 1.

[0048] In particular, the Fig. 10 and Fig. 9 each a chip thermistor and a pin thermistor, both of which are thermistor elements and differ primarily in their encapsulation forms and application scenarios.

[0049] The chip thermistor is a surface-mounted, encapsulated thermistor element. Due to its unique encapsulation, it requires specialized chip mounting equipment. Compared to the pin thermistor, the chip thermistor is smaller and less expensive, making it ideal for high-density printed circuit boards and widely used in the modern electronics industry.

[0050] In contrast, a pin thermistor is a thermistor element encapsulated with pins and connected to the circuit board via these pins. Compared to a chip thermistor, a pin thermistor offers better stability and reliability, making it more suitable for applications requiring higher signal accuracy, faster response times, and similar performance. For example, pin thermistors are widely used in areas such as temperature measurement and control, power management, and similar applications.

[0051] In particular, it shows Fig. Figure 11 shows a structural schematic representation of the projection 13 according to one embodiment. In the actual manufacture of the flexible printed circuit board body 1, the projection 13 can be designed with any desired shape.

[0052] Furthermore, with reference to Fig. 12 a capacitor 15 is further arranged on the flexible circuit board body 1, wherein both ends of the capacitor 15 are electrically connected to the positive terminal of the power supply and the negative terminal of the power supply respectively, in order to eliminate the parasitic oscillating electromagnetic waves generated by the heating element 3.

[0053] Since the relatively strong parasitic oscillating electromagnetic waves generated in the circuit can cause discomfort, especially when the heating mat is arranged around the human body, the capacitor 15 is additionally provided, which eliminates the parasitic oscillating electromagnetic waves generated by the heating element 3 and reduces the undesirable effects of the parasitic oscillating electromagnetic waves on the human body.

[0054] In some embodiments, a heating mat is arranged with a flexible printed circuit board body 1 without thermistors, as in Fig. Figure 12 shows which heating mat is suitable for heating the backrest of a vehicle seat and also for controlling a heating time by means of a control unit.

[0055] Furthermore, a thermostat 5 is mounted on the flexible printed circuit board body 1; one end of the thermostat 5 is connected to the first wiring zone 11 or the second wiring zone 12 and the other end is connected to the heating element 3 in order to disconnect the electrical connection between the heating element 3 and the power supply when the temperature of the heating element 3 exceeds the setpoint.

[0056] In some embodiments, the thermostat 5 has an internal elastic metal sheet, which is characterized by deformation upon exposure to heat. At low temperatures, the first wiring zone 11 is electrically connected to the second wiring zone 12 via the elastic metal sheet. If the temperature of the heating element 3 exceeds the deformation temperature of the elastic metal sheet, the elastic metal sheet deforms, thus severing the electrical connection between the first wiring zone 11 and the second wiring zone 12.

[0057] The target value is in particular the deformation temperature of the elastic metal sheet and an elastic metal sheet that deforms at 37-43 degrees or 47-53 degrees can be selected, which ensures that the heating temperature of the heating element 3 is not too high and prevents scalding of the passengers sitting on the vehicle seat equipped with the heating circuit board.

[0058] With reference to Fig. A battery symbol (13) indicates that the positive terminal of the power supply is switched on. The first wiring zone 11 and the second wiring zone 12 in the figure can be arranged on the same side, close to each other, and the thermistor 4 is located near the second conductor section 9. The control module can calculate and assess the actual temperature of the heating element 3 by sensing the temperature of the second conductor section 9, depending on parameters of the second conductor section 9 such as width, thickness, heat generation coefficient, and the like.

[0059] The overlapping parts of the second conductor section 9 and the thermistor 4 are each arranged on different outer surfaces of the flexible printed circuit board body 1 in order to achieve space saving.

[0060] Furthermore, with reference to Fig. 14 a positioning mark 16 is provided on the substrate 2; wherein a positioning groove 17 is arranged on the flexible printed circuit board body 1, wherein the positioning groove 17 is used to align with the positioning marker 16 in order to fix a relative position of the flexible printed circuit board body 1 to the substrate 2.

[0061] In some embodiments, the positioning marker 16 and the positioning groove 17 are used in conjunction with each other, which can facilitate quick mounting of the flexible printed circuit board body 1 and the heating element 3 on the substrate 2.

[0062] In particular, the positioning mark 16 can be a hole, a stitched mark, or a drawn pattern on the substrate 2. The positioning groove 17 can be located at the edge of the flexible printed circuit board body 1 or at a position inside the flexible printed circuit board body 1 where no circuit structure is provided, and there is at least one.

[0063] Preferably, the positioning grooves 17 are two notches arranged on the edge of the flexible printed circuit board body 1.

[0064] Preferably the positioning grooves 17 are two holes that are arranged far apart from each other at a position inside the flexible printed circuit board body 1 where no circuit structure is provided.

[0065] The above description presents only preferred embodiments of the present utility model and illustrates the technical principles applied. The person skilled in the art should understand that the scope of the invention of the present utility model is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but is intended to include other technical solutions formed by any combination of the above-mentioned technical features or their equivalents, without departing from the inventive concept. An example of this is a technical solution formed by replacing the above-mentioned features with technical features having similar functions that are disclosed (but not limited to) in the present utility model.

Claims

[1] Heating mat, characterized by that the heating mat includes: a substrate (2); a flexible printed circuit board body (1), wherein the flexible printed circuit board body (1) is arranged on the substrate (2); wherein the flexible printed circuit board body (1) is provided with a first conductor section (8) and a second conductor section (9); wherein the first conductor section (8) has at least one first wiring zone (11) exposed on a surface of the flexible printed circuit board body (1); and wherein the second conductor section (9) has at least one second wiring zone (12) exposed on a surface of the flexible printed circuit board body (1); wherein the first wiring zone (11) is electrically connected to a positive pole of a power supply and the second wiring zone (12) is electrically connected to a negative pole of the power supply; an electrically conductive assembly (19), the electrically conductive assembly (19) being connected to the first wiring zone (11) and the second wiring zone (12); a heating element (3), both ends of the heating element (3) being connected to the electrically conductive assembly (19) via the first wiring zone (11) and the second wiring zone (12) respectively, in order to generate heat after the power supply is switched on. [2] Heating mat according to claim 1, characterized by in that the first conductor section (8) has a single first wiring zone (11), wherein the first conductor section (8) is arranged on the flexible printed circuit board body (1) by means of a printing process; and / or the second conductor section (9) has a single second wiring zone (12), wherein the second conductor section (9) is arranged on the flexible printed circuit board body (1) by means of a printing process. [3] Heating mat according to claim 1, characterized byin that the first conductor section (8) has two first wiring zones (11), wherein the two first wiring zones (11) are each exposed on different surfaces of the flexible printed circuit board body (1) and at least partially overlap in a direction perpendicular to the surface of the flexible printed circuit board body (1); and / or the second conductor section (9) has two second wiring zones (12), wherein the two second wiring zones (12) are each exposed on different surfaces of the flexible printed circuit board body (1) and the two second wiring zones (12) at least partially overlap in a direction perpendicular to the surface of the flexible printed circuit board body (1). [4] Heating mat according to claim 1, characterized bythat a thermistor (4) is further mounted on the flexible printed circuit board body (1), wherein the thermistor (4) is arranged in the vicinity of the first conductor section (8) or the second conductor section (9) in order to detect the temperature at the first conductor section (8) or the second conductor section (9). [5] Heating mat according to claim 1, characterized by that a thermistor (4) is further mounted on the flexible circuit board body (1), wherein the thermistor (4) is arranged in the vicinity of the heating element (3) in order to detect the temperature at the heating element (3). [6] Heating mat according to claim 4 or 5, characterized by that at least one end of the thermistor (4) is used for electrical connection to a control module (14). [7] Heating mat according to claim 4 or 5, characterized bythat the thermistor (4) is a chip thermistor (7); wherein a projection (13) is further provided on the flexible circuit board body (1); and the chip thermistor (7) is mounted on the projection (13). [8] Heating mat according to claim 1, characterized by that a capacitor (15) is further arranged on the flexible printed circuit board body (1), wherein both ends of the capacitor (15) are electrically connected to the positive pole of the power supply and the negative pole of the power supply, respectively, in order to eliminate the parasitically oscillating electromagnetic waves generated by the heating element (3). [9] Heating mat according to claim 1, characterized bythat a thermostat (5) is further mounted on the flexible printed circuit board body (1); wherein one end of the thermostat (5) is connected to the first wiring zone (11) or the second wiring zone (12) and the other end is connected to the heating element (3) in order to disconnect 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] Heating mat according to claim 1, characterized by that a positioning mark (16) is provided on the substrate (2); wherein a positioning groove (17) is arranged on the flexible printed circuit board body (1), wherein the positioning groove (17) is used for alignment with the positioning mark (16) in order to fix a relative position of the flexible printed circuit board body (1) to the substrate (2).

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