PTC heating device, temperature-measurable heating tube and control method

Abstract

This invention discloses a PTC heating device, a temperature-measuring heating element, and a control method, belonging to the technical field of electric heating elements. The PTC heating device includes a shell and a heating core. The shell has a liquid inlet and an outlet, and an internal flow channel connecting the inlet and outlet. The heating core is disposed within the shell and includes an integrated plate and multiple heating elements disposed on the integrated plate. A medium flow channel is formed between the outer walls of two adjacent heating elements, connecting the flow channel. The temperature-measuring heating element includes a tube body with an axially extending partition dividing the tube body into a first cavity and a second cavity. A heating element is disposed in the second cavity, and a temperature-measuring element is disposed in the first cavity. The control method uses the aforementioned device. This invention improves heat exchange efficiency, simplifies the structure, and reduces flow resistance through the coordinated operation of the shell, heating core, and temperature-measuring heating element.

Description

Technical Field

[0001] This invention relates to the field of electric heating element technology, and in particular to a PTC heating device, a temperature-measuring heating tube, and a control method. Background Technology

[0002] The vehicle-mounted PTC water heater is a heating component in the heating system and battery thermal management system of new energy electric vehicles. By heating the circulating coolant, the heated coolant is delivered to the air conditioning heating core or the battery pack to achieve the functions of vehicle heating and battery low-temperature preheating.

[0003] Currently, the temperature detection method for vehicle-mounted PTC water heaters generally adopts a structure that combines a temperature sensing component with an independent temperature sensing column. The temperature sensing column is independently installed inside the heater, and the NTC sensor is encapsulated inside the temperature sensing column. A part of the temperature sensing column extends into the flow channel, sensing the temperature of the medium by contacting the flowing coolant, and transmitting the collected temperature signal to the vehicle controller as a reference for adjusting the heating power.

[0004] However, due to limitations in the heater's internal layout and manufacturing process, the length of the temperature probe and its insertion position into the flow channel cannot extend to the main channel area of ​​the inlet and outlet. It can only collect the temperature of the pipe wall or fluid in a localized area of ​​the flow channel, resulting in a significant deviation from the actual temperature of the medium at the inlet and outlet. This leads to problems such as mismatch between heating power and demand, and large fluctuations in outlet water temperature when the vehicle controller adjusts the power based on this temperature signal. In addition, the protruding structure formed by the temperature probe extending into the flow channel creates a throttling and turbulence effect on the coolant flow, increasing the resistance to medium flow, reducing heat exchange efficiency, and hindering further optimization of vehicle energy consumption. Summary of the Invention

[0005] The purpose of this invention is to provide a PTC heating device, a temperature-measuring heating tube, and a control method to solve the technical problems of insufficient temperature detection accuracy and high medium flow resistance caused by unreasonable temperature measurement structure arrangement in the prior art.

[0006] To achieve this objective, the present invention adopts the following technical solution: On one hand, the present invention provides a PTC heating device, comprising: The housing has a liquid inlet and a liquid outlet, and a flow channel is formed inside the housing to connect the liquid inlet and the liquid outlet; A heating core is disposed within the housing. The heating core includes an integrated plate and a plurality of heating tubes disposed on the integrated plate. A medium flow channel is formed between the outer walls of two adjacent heating tubes to communicate with the flow channel.

[0007] Preferably, the inlet and the outlet are located on the same side of the housing, the medium flow channel is divided into a first channel and a second channel, the inlet is connected to the first channel, the outlet is connected to the second channel, and the flow channel connects the first channel and the second channel.

[0008] Preferably, the housing further includes a first diverter plate and a second diverter plate; the first diverter plate is disposed at the liquid inlet, and the first diverter plate has a plurality of first diverter channels connecting the liquid inlet and the inlet of the first channel; the second diverter plate is disposed at the liquid outlet, and the second diverter plate has a plurality of second diverter channels connecting the liquid outlet and the outlet of the second channel.

[0009] Preferably, a sealing structure is provided between the outer peripheral wall of the integrated plate and the inner peripheral wall of the housing.

[0010] Preferably, multiple guide ridges are provided on opposite sides of the heating tube. The guide ridges extend along the axial direction of the heating tube, and the multiple guide ridges are arranged at intervals along the circumference of the heating tube. The corresponding guide ridges on two adjacent heating tubes are connected to each other to form an axially connected medium flow channel.

[0011] On the other hand, the present invention also provides a temperature-sensing heating element, which is applied to the above-mentioned PTC heating device, the temperature-sensing heating element comprising: The tube body has an axially extending partition inside, which divides the interior of the tube body into a first cavity and a second cavity. The heating element is disposed within the second cavity; The temperature measuring component is disposed within the first cavity.

[0012] Preferably, the heating component includes a conductive electrode and a plurality of heating elements, which are arranged sequentially along the axial direction of the tube body. At least a portion of the heating elements are connected to the conductive electrode, which has a conductive portion extending out of the tube body.

[0013] Preferably, the heating element further includes a heat-conducting element, which is disposed in the tube containing the temperature measuring element and connected to the heating element.

[0014] Preferably, the heating element further includes a thermally conductive insulating film disposed between the conductive electrode and the inner wall of the second cavity, and covering the conductive electrode and the outer surface of the heating element.

[0015] Preferably, the first cavity is filled with a thermally conductive medium, the temperature measuring component is fixed to the first cavity through the thermally conductive medium, and the outer wall of the temperature measuring component and the inner wall of the first cavity are filled with the thermally conductive medium to form a gapless thermal conduction path.

[0016] Preferably, the partition extends along the axial direction of the tube body, and the radial cross-section of the partition is arc-shaped, with the arc protruding from the second cavity toward the first cavity.

[0017] Preferably, the temperature-measuring heating tube further includes a bottom cover, which is connected to one end of the tube body along the axial direction and simultaneously seals the ports of the first cavity and the second cavity, with the bottom cover and the tube body being sealed together.

[0018] In another aspect, the present invention also provides a control method for a PTC heating device, the control method comprising: Acquire the liquid temperature signal detected in real time by the temperature sensing component; The actual outlet water temperature of the PTC heating device is determined based on the liquid temperature signal. Obtain the target outlet water temperature; Based on the deviation between the actual outlet water temperature and the target outlet water temperature, a power adjustment command is generated using a preset adjustment strategy. The preset adjustment strategy includes: when the deviation is greater than a preset first threshold, adjusting the electrical power applied to the heating element at a first adjustment rate; when the deviation is less than or equal to the first threshold and greater than a preset second threshold, adjusting the electrical power at a second adjustment rate, wherein the first adjustment rate is greater than the second adjustment rate. The power adjustment command is corrected by feedforward compensation based on the actual water temperature change rate within a preset time window. The corrected power adjustment command is output to the power control terminal of the heating element so that the actual outlet water temperature approaches the target outlet water temperature.

[0019] The beneficial effects of this invention are: One aspect of this invention presents a PTC heating device. By installing an integrated plate within the housing and mounting multiple heating elements on the integrated plate, a medium flow channel naturally forms between the outer walls of adjacent heating elements, connecting to a flow passage. This allows the coolant to directly enter the medium flow channel between the heating elements and fully contact the outer walls of each heating element, thereby increasing the heat exchange area between the coolant and the heating elements within a limited space. This enables the heat generated by the heating elements to be transferred more efficiently to the flowing liquid medium, effectively improving the heating efficiency and thermal response speed per unit volume. Simultaneously, because the medium flow channel is directly enclosed by the outer walls of the heating elements, the liquid can be evenly distributed along the axial direction of the heating elements as it flows through the medium flow channel. This avoids dead zones or short circuits in the liquid flow within the housing, ensuring that the heat on the surface of each heating element is uniformly carried away, thus improving the overall heating uniformity of the device. Furthermore, the formation of the medium flow channel makes full use of the layout structure of the heating element itself, eliminating the need for additional independent components inside the housing to guide or separate the flow channel. This not only simplifies the internal structural hierarchy of the housing but also makes the flow path of the liquid in the flow channel smoother, effectively reducing the flow resistance encountered by the liquid when it flows through the entire device. This helps to reduce the energy consumption of the system circulation pump, thereby further optimizing the energy utilization efficiency of the entire vehicle while ensuring heating performance. Moreover, the compact and reasonable structural layout helps to reduce the overall volume of the heating device and facilitates flexible arrangement within the limited space of the vehicle.

[0020] Another aspect of this invention proposes a temperature-measuring heating tube that integrates heating and temperature measurement functions by providing an axially extending partition inside the tube body, dividing the tube body into two independent chambers: a first chamber and a second chamber. The heating element is housed in the second chamber, while a temperature-measuring element is housed in the first chamber. Since the temperature-measuring element is located inside the first chamber, and the first chamber is separated from the external flow channel of the tube body only by the tube wall, the temperature-measuring element can directly sense the temperature of the liquid flowing over the surface of the heating tube through the tube wall. Compared to setting separate temperature measurement points at other locations inside the casing, this structure makes the temperature signal detected by the temperature-measuring element closer to the actual temperature of the liquid in the medium flow channel, thereby effectively improving the accuracy of temperature acquisition and the timeliness of signal feedback. Simultaneously, the partition physically isolates the heating element and the temperature-measuring element in two independent chambers, preventing the high temperature generated by the heating element during operation from directly affecting the measurement accuracy of the temperature-measuring element, and preventing electrical interference between the leads or components of the temperature-measuring element and the heating element, ensuring the signal stability and reliability of the temperature-measuring element during long-term operation. Moreover, since the temperature measuring component is directly built into the heating tube, the heating device does not need to install an additional independent temperature measuring probe or temperature measuring column in the housing when using the temperature measuring heating tube. This not only reduces the number of parts and assembly steps in the housing and improves assembly efficiency, but also avoids disturbance or obstruction to the liquid flow caused by additional temperature measuring components extending into the flow channel. Thus, while improving the temperature measuring accuracy, it also optimizes the overall flow smoothness of the device. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the PTC heating device provided in Embodiment 1 of the present invention; Figure 2 This is a cross-sectional view of the PTC heating device provided in Embodiment 1 of the present invention from one perspective; Figure 3 This is a cross-sectional view from another perspective of the PTC heating device provided in Embodiment 1 of the present invention; Figure 4 This is a top view of the heating core provided in Embodiment 1 of the present invention; Figure 5 This is a partial structural schematic diagram of the temperature-measuring heating tube provided in Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of the structure of the temperature-measuring heating tube provided in Embodiment 1 of the present invention; Figure 7 This is an exploded structural diagram of the temperature-measuring heating tube provided in Embodiment 1 of the present invention.

[0022] In the picture: 1. Shell; 11. Inlet; 12. Outlet; 13. Flow channel; 14. First flow divider; 141. First flow divider channel; 15. Second flow divider; 151. Second flow divider channel; 16. Reinforcing rib; 17. Sealing structure; 2. Heating core; 3. Integrated circuit board; 4. Heating element; 41. Medium flow channel; 411. First channel; 412. Second channel; 5. Tube body; 51. First cavity; 52. Second cavity; 53. Separator; 54. Heat transfer medium; 55. Guide ridge; 56. Support ridge; 57. Bottom cover; 6. Heating element; 61. Conductive electrode; 611. Conductive part; 62. Heating component; 63. Thermally conductive component; 64. Thermally conductive insulating film; 7. Temperature measuring component; 71. Detection section; 72. Connection section. Detailed Implementation

[0023] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0024] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] Example 1 See Figures 1 to 7 The PTC heating device provided in this embodiment of the invention includes a housing 1 and a heating core 2. The housing 1 has a liquid inlet 11 and a liquid outlet 12, and a flow channel 13 is formed inside the housing 1 to connect the liquid inlet 11 and the liquid outlet 12. The heating core 2 is disposed inside the housing 1 and includes an integrated plate 3 and a plurality of heating tubes 4 disposed on the integrated plate 3. A medium flow channel 41 is formed between the outer walls of two adjacent heating tubes 4 to connect the flow channel 13.

[0028] The housing 1 serves as the external protective structure of the entire device and the mounting base for internal components. The housing 1 is generally rectangular in shape, and its interior contains a space for accommodating the heating core 2 and allowing liquid to flow through. The housing 1 has a liquid inlet 11 and a liquid outlet 12, and a flow channel 13 is formed inside the housing 1 connecting the liquid inlet 11 and the liquid outlet 12. After the coolant enters the housing 1 through the liquid inlet 11, it flows through the flow channel 13 and exchanges heat with the heating core 2. The heated liquid then flows out through the liquid outlet 12, thereby achieving the heating function of the circulating coolant.

[0029] The positions of the liquid inlet 11 and the liquid outlet 12 on the housing 1 can be flexibly set according to the actual installation space and pipeline layout requirements.

[0030] In this embodiment, the inlet 11 and outlet 12 are located on the same side of the housing 1. The medium flow channel 41 is correspondingly divided into a parallel and independent first channel 411 and a second channel 412. The inlet 11 is connected to the first channel 411, and the outlet 12 is connected to the second channel 412. The flow channel 13 connects the first channel 411 and the second channel 412. With the same-side inlet and outlet arrangement, the coolant enters from the inlet 11 and flows to the heating area through the first channel 411. After sufficient heat exchange with the heating element 4 in the flow channel 13, it flows out from the outlet 12 through the second channel 412. The entire flow path forms a zigzag flow direction inside the housing 1, which helps to prolong the residence time of the liquid in the housing 1 and allows for more sufficient heat exchange between the liquid and the heating element 4.

[0031] In other embodiments, the inlet 11 and outlet 12 can also be located on opposite sides of the housing 1. In this case, the medium flow channel 41 and the flow channel 13 are basically coincident. The liquid flows directly through the interior of the housing 1 along the direction from the inlet 11 to the outlet 12. This arrangement has a short flow path and low flow resistance, and is suitable for working conditions with high flow requirements and relatively short heat exchange time requirements.

[0032] In addition, the inlet 11 and outlet 12 can be set on different sides of the housing 1 according to the specific route of the vehicle's pipeline to meet diverse installation needs, which will not be elaborated here.

[0033] To further improve the uniformity of liquid flow when entering and leaving the heating zone, a first flow divider 14 and a second flow divider 15 are provided on the housing 1. The first flow divider 14 is located at the liquid inlet 11 and has multiple first flow divider channels 141 connecting the liquid inlet 11 to the inlet of the first channel 411. The second flow divider 15 is located at the liquid outlet 12 and has multiple second flow divider channels 151 connecting the liquid outlet 12 to the outlet of the second channel 412. The number of first flow divider channels 141 and second flow divider channels 151 is the same as the number of corresponding first channels 411 and second channels 412, and they correspond one-to-one. The first diverter plate 14 is used to evenly distribute the coolant flowing from the inlet 11 into each of the first channels 411, avoiding uneven flow rates in each channel due to concentrated inflow at the inlet 11, and ensuring that there is sufficient liquid flow around each heating element 4, thereby balancing the heat exchange load of each heating element 4. The second diverter plate 15 is used to collect the heated liquid in each of the second channels 412 and guide it to the outlet 12 for unified discharge, thus serving as a confluencer. Through the combination of the diversion function of the first diverter plate 14 and the confluence function of the second diverter plate 15, the liquid flow in the entire flow channel 13 is more uniform and orderly, avoiding uneven heat exchange caused by excessively high or low local flow velocities.

[0034] Preferably, the outer periphery of the housing 1 is provided with reinforcing ribs 16. The reinforcing ribs 16 protrude along the outer wall of the housing 1, effectively improving the structural strength and deformation resistance of the housing 1. Since the housing 1 is filled with pressurized circulating coolant during operation of the PTC heating device, and also needs to withstand vibration and impact loads from vehicle operation, the reinforcing ribs 16 on the outer periphery of the housing 1 enhance the rigidity of the housing wall, preventing deformation or cracking under internal liquid pressure or external mechanical force, thereby ensuring the long-term reliability and sealing performance of the device.

[0035] The reinforcing ribs 16 can extend continuously along the length or width of the shell 1, or they can be arranged in a staggered manner to provide effective reinforcement in all stress directions of the shell 1.

[0036] The heating core 2 is disposed within the housing 1. The heating core 2 includes an integrated plate 3 and multiple heating tubes 4 disposed on the integrated plate 3. The integrated plate 3 is used to fix and support each heating tube 4, so that the multiple heating tubes 4 are arranged in a regular heating array at a predetermined interval.

[0037] In the assembled state, the heating core 2 is embedded inside the housing 1. An annular sealing ring is installed between the mating surfaces of the integrated plate 3 and the housing 1. The high-pressure water seal of the mating surfaces is achieved by the compression deformation of the annular sealing ring, which effectively prevents the coolant inside the housing 1 from leaking outward along the joint between the integrated plate 3 and the housing 1. This ensures that the device maintains reliable sealing performance in the working environment of high-pressure circulating coolant, and also prevents external impurities from entering the housing 1 and contaminating the coolant or affecting the normal operation of the heating tube 4.

[0038] Specifically, the integrated plate 3 can be designed as a flat plate structure according to actual needs. The shape of the integrated plate 3 is adapted to the internal contour of the shell 1 so that the heating core 2 can be accurately installed in place.

[0039] The heating element 4 is fixedly connected to the integrated plate 3. Specifically, one end of the heating element 4 can pass through the integrated plate 3 and be fixedly connected to the integrated plate 3 by means of welding, riveting or threaded connection. The heating elements 4 are kept parallel and spaced at a predetermined distance.

[0040] The use of an integrated board 3 to integrate multiple heating elements 4 into a single heating core 2 module not only facilitates overall assembly and disassembly within the housing 1, improving production assembly efficiency, but also ensures the relative positional accuracy between each heating element 4, making the arrangement of each heating element 4 within the housing 1 more regular and orderly.

[0041] Preferably, a sealing structure 17 is provided between the outer peripheral wall of the integrated plate 3 and the inner peripheral wall of the housing 1. The sealing structure 17 is used to block the path of coolant leakage from the inside of the housing 1 to the outside along the joint surface between the integrated plate 3 and the housing 1, so that a reliable liquid-tight fit is formed between the integrated plate 3 and the housing 1, ensuring the safety of the device in high-pressure working environment.

[0042] Optionally, the sealing structure 17 is an annular sealing ring, which is fitted onto the outer peripheral wall of the integrated plate 3, and the outer peripheral surface of the annular sealing ring is in close contact with the inner peripheral wall of the housing 1.

[0043] Specifically, a sealing groove is provided on the outer peripheral wall of the integrated plate 3, and an annular sealing ring is embedded in the sealing groove. A part of the annular sealing ring protrudes from the opening of the sealing groove. When the heating core 2 is installed into the housing 1, the protruding part is compressed by the integrated plate 3 and the housing 1 together, and the annular sealing ring undergoes elastic deformation and fills the gap between the integrated plate 3 and the housing 1, thereby forming a stable sealing contact surface.

[0044] The annular seal can be made of a high-temperature resistant flexible material, such as fluororubber or silicone rubber, to adapt to the high-temperature working environment of the coolant and maintain good elastic recovery performance.

[0045] The heating element 4 has a flat, plate-like structure. This flat, plate-like design gives the heating element 4 a large surface area to volume ratio, providing a larger heat exchange area within the same volume, which is beneficial for the efficient transfer of heat from the inside of the heating element 4 to the coolant flowing through its outer wall. Simultaneously, the flat, plate-like tube body facilitates the sequential arrangement of multiple heating elements 4 side-by-side, with the wide faces of each heating element 4 facing each other and the narrow faces towards the flow direction, thus forming a rectangular heating core 2. This allows for a compact arrangement within the rectangular cavity of the housing 1, maximizing the use of the limited space within the housing 1 and increasing the power density of the heating device.

[0046] To form a medium flow channel 41 connecting the outer walls of two adjacent heating tubes 4, multiple guide ridges 55 are provided on opposite sides of the heating tubes 4. The guide ridges 55 extend axially along the heating tubes 4, and the multiple guide ridges 55 are arranged at intervals circumferentially along the heating tubes 4, with each guide ridge 55 protruding outward from the surface of the heating tube 4 at a predetermined height. When multiple heating tubes 4 are assembled side by side on the integrated plate 3, the corresponding guide ridges 55 on two adjacent heating tubes 4 abut against each other, that is, the guide ridge 55 on one heating tube 4 is radially aligned and in contact with the guide ridge 55 on the adjacent heating tube 4 that is positioned opposite each other, thereby forming an axially penetrating medium flow channel 41 between two adjacent heating tubes 4.

[0047] After entering the housing 1, the coolant flows through the heating tubes 4 via the medium flow channel 41, where it undergoes thorough heat exchange with the outer wall of the heating tubes 4. The presence of the guiding ridges 55 not only constrains the formation of the medium flow channel 41, ensuring the coolant flows orderly along the predetermined path between the heating tubes 4 and preventing the formation of local flow dead zones due to random flow between the heating tubes 4, but also increases the contact area between the heating tubes 4 and the coolant, thus enhancing the heat exchange effect. Furthermore, the arrangement of the guiding ridges 55 extending axially along the heating tubes 4 gives the medium flow channel 41 a straight direction, resulting in a gentle change in the direction of liquid flow within the medium flow channel 41, low flow resistance, and reduced pumping power consumption.

[0048] It is understandable that, for the two outermost heating tubes 4, the side of the heating tube 4 facing the inner wall of the housing 1 may or may not be provided with guide ridges 55, depending on the actual installation requirements. In one embodiment, the two outermost heating tubes 4 do not have guide ridges 55 on the side facing the inner wall of the housing 1, so that they can directly fit against the inner wall surface of the housing 1, which facilitates the positioning and fixing of the heating core 2 within the housing 1, and also simplifies the processing of the internal cavity of the housing 1. In another embodiment, the two outermost heating tubes 4 also have guide ridges 55 on the side facing the inner wall of the housing 1, and correspondingly, guide ridges 55 are also provided on the inner wall of the housing 1. After they are joined together, they can also form a medium flow channel 41, which can make full use of the space between the heating tube 4 and the inner wall of the housing 1, so that the coolant can also flow through the medium flow channel 41 between the outermost heating tube 4 and the inner wall of the housing 1, further increasing the heat exchange area and flow cross-sectional area, and improving the utilization efficiency of the space inside the housing 1.

[0049] Meanwhile, support ridges 56 are provided on opposite sides of the heating tube 4, and the support ridges 56 also extend along the axial direction of the heating tube 4. The side of the support ridge 56 away from the heating tube 4 forms a support surface. When two adjacent heating tubes 4 are arranged side by side, the support surfaces of the corresponding support ridges 56 on the two heating tubes 4 abut against each other for support.

[0050] It is worth noting that the supporting ridge 56 and the guiding ridge 55 differ in function. The guiding ridge 55 mainly serves to constrain the liquid flow path, while the supporting ridge 56 mainly serves to provide structural support and maintain the spacing between the tubes. By setting supporting ridges 56 on both sides of the heating tube 4 and making the supporting ridges 56 of adjacent heating tubes 4 abut against each other, a rigid support connection is formed between multiple heating tubes 4, enhancing the structural strength and compression resistance of the entire heating core 2. When the shell 1 is subjected to external impact or vibration, the supporting ridges 56 can transmit and disperse the external force between each heating tube 4, preventing individual heating tubes 4 from deforming or being damaged due to excessive force. At the same time, the abutting fit of the supporting ridges 56 also ensures that the relative position between adjacent heating tubes 4 will not shift due to vibration during use, thereby ensuring the dimensional stability of the medium flow channel 41, keeping the flow cross-sectional area of ​​each medium flow channel 41 consistent, and helping to maintain the uniformity of liquid flow rate in each medium flow channel 41.

[0051] This invention also provides a temperature-measuring heating tube, which is applied to the above-mentioned PTC heating device as the heating tube 4 in the heating core 2. The structure and principle of the temperature-measuring heating tube will be described in detail below.

[0052] The temperature-measuring heating tube includes a tube body 5, a heating element 6, and a temperature-measuring element 7.

[0053] Specifically, the tube body 5 has an axially extending partition 53 inside, which divides the inside of the tube body 5 into a first cavity 51 and a second cavity 52. ​​The first cavity 51 is used to house the temperature measuring component 7, and the second cavity 52 is used to house the heating component 6.

[0054] By setting a partition 53 inside the tube body 5 to isolate the two cavities in space, the heat generated by the heating element 6 during operation is mainly transferred outward through the wall of the tube body 5 to the coolant flowing through the outer wall of the tube body 5. The cavity where the temperature measuring element 7 is located is separated from the cavity where the heating element 6 is located, reducing the path of direct heat conduction from the heating element 6 to the temperature measuring element 7. This makes the temperature detected by the temperature measuring element 7 more accurately reflect the temperature of the coolant at the outer wall of the tube body 5, rather than the internal temperature of the heating element 6 itself.

[0055] Specifically, the partition 53 extends axially along the tube body 5, and its radial cross-section is arc-shaped, with the arc protruding from the second cavity 52 towards the first cavity 51. During the extrusion molding of the tube body 5, the arc-shaped transition cross-sectional shape makes the metal material more evenly stressed during flow, avoiding local stress concentration caused by uneven material flow at sharp corners or bends, thereby effectively reducing the risk of rib cracking or channel deformation. Simultaneously, the tube body 5 with the partition 53 is directly formed using an integral extrusion molding process, eliminating the need for subsequent secondary welding or assembly of the partition structure. This not only simplifies the processing steps and reduces manufacturing costs but also eliminates the problems of insufficient connection strength and additional thermal resistance caused by welding connections.

[0056] One end of the tube body 5 extends out for the corresponding parts of the heating element 6 and the temperature measuring element 7, so as to facilitate electrical connection with the external power supply and control circuit, while the other end of the tube body 5 is sealed by the bottom cover 57.

[0057] Specifically, the bottom cover 57 is connected to one end of the tube body 5 along the axial direction and simultaneously seals the ports of the first cavity 51 and the second cavity 52, with a sealed connection between the bottom cover 57 and the tube body 5.

[0058] Optionally, the bottom cover 57 is fixedly connected to the end of the tube body 5 by laser full welding to ensure the long-term sealing reliability of the end of the tube body 5 under high-pressure coolant environment, and to prevent coolant from seeping into the interior of the tube body 5 along the end of the tube body 5 and affecting the normal operation of the heating element 6 and the temperature measuring element 7. After the bottom cover 57 is welded and sealed, a closed first cavity 51 and a second cavity 52 are formed inside the tube body 5. The heating element 6 and the temperature measuring element 7 are sealed and housed in their respective cavities, completely isolated from the external coolant, which ensures electrical safety and avoids the corrosion of the components by the coolant.

[0059] Regarding the specific structure and arrangement of the temperature sensing component 7, the temperature sensing component 7 includes a detection part 71 and a connecting part 72. The detection part 71 is located inside the first cavity 51, and the connecting part 72 is connected to the detection part 71 and extends along the axial direction of the first cavity 51 in a direction away from the bottom cover 57. The detection part 71 senses the temperature of the coolant flowing through the outer wall of the tube body 5 via the wall surface of the tube body 5. The connecting part 72 extends out of the first cavity 51 at the end away from the bottom cover 57 to facilitate electrical connection with an external power supply and control circuitry, thereby realizing the output of a temperature signal.

[0060] Among them, the specific type of temperature measuring component 7 can be other forms of temperature detection element such as NTC temperature sensor, PTC temperature sensor, thermocouple or platinum resistance temperature sensor. It can be flexibly selected according to the actual measurement accuracy requirements, cost budget and working temperature range, and all of them can realize the function of detecting the liquid temperature in the flow channel 13.

[0061] To further improve the heat transfer efficiency and fixing reliability between the temperature measuring component 7 and the tube body 5, the first cavity 51 is filled with a heat-conducting medium 54. The temperature measuring component 7 is fixed in the first cavity 51 through the heat-conducting medium 54, and the outer wall of the temperature measuring component 7 and the inner wall of the first cavity 51 are filled with the heat-conducting medium 54 to form a gapless heat conduction path.

[0062] The thermally conductive medium 54 can specifically be a thermally conductive structural adhesive.

[0063] During assembly, first apply high thermal conductivity structural adhesive to the bottom of the first cavity 51, and then push the temperature measuring component 7 into the first cavity 51 until the detection part 71 is pressed against the end face of the bottom cover 57.

[0064] During this process, the thermally conductive adhesive flows between the temperature sensing component 7 and the inner wall of the first cavity 51, filling all the gaps between them. After curing, it firmly bonds the temperature sensing component 7 to the first cavity 51. This air-gap-free heat conduction path eliminates the heat transfer bottleneck caused by air gaps. The heat from the coolant is transferred to the detection unit 71 through the wall of the tube 5 and the thermally conductive adhesive. The heat transfer path is continuous and has minimal thermal resistance, enabling the temperature sensing component 7 to respond quickly and accurately to changes in the coolant temperature.

[0065] Meanwhile, the thermally conductive structural adhesive also plays a role in fixing and vibration reduction. Under the vibration conditions during vehicle operation, the temperature measuring component 7 is reliably constrained within the first cavity 51 by the thermally conductive structural adhesive, avoiding sensor loosening or displacement caused by vibration, and ensuring the stability and consistency of temperature detection during long-term use.

[0066] The heating component 6 includes a conductive electrode 61 and a plurality of heating elements 62. The plurality of heating elements 62 are arranged sequentially along the axial direction of the second cavity 52. ​​At least some of the heating elements 62 are connected to the conductive electrode 61. The conductive electrode 61 has a conductive portion 611 extending out of the second cavity 52 in a direction away from the bottom cover 57 for electrical connection with an external power source.

[0067] In this embodiment, the heating element 62 is a heating plate, that is, a sheet-shaped heating element that has the function of generating heat when energized. The heating plate is usually made of ceramic material with positive temperature coefficient characteristics. It has the characteristics of low resistance and rapid heating when energized below the Curie temperature, and a sharp increase in resistance and automatic power reduction when approaching the Curie temperature. Therefore, it has a self-limiting temperature function and can effectively avoid overheating damage caused by temperature runaway.

[0068] Two conductive electrodes 61 are provided, which are distributed opposite each other on both sides of the heating element 62, and are respectively connected to the positive and negative terminals of the power supply. When the external power supply supplies power to the heating element 62 through the conductive electrodes 61, the current flows through each heating element 62, causing it to generate Joule heat. The heat is then transferred outward through the wall of the tube body 5 to the coolant flowing through the outer wall of the tube body 5, thereby heating the coolant. The conductive parts 611 of the two conductive electrodes 61 are staggered to avoid the risk of creepage or short circuit due to the small distance between the two conductive parts 611 when they extend out of the tube body 5. At the same time, it also facilitates the spatial arrangement of external connection harnesses, reduces assembly difficulty, and improves electrical safety.

[0069] For the tube body 5 equipped with the temperature measuring component 7, the heating component 6 also includes a heat-conducting element 63, which is connected to the heating component 62 and located in the second cavity 52 near the bottom cover 57. In this embodiment, the heat-conducting element 63 is a heating dummy plate, which does not have the function of generating heat through electricity and is only used as a structural filler and heat conduction medium.

[0070] Specifically, in the second cavity 52 near the end of the bottom cover 57 of the tube body 5, the first piece is a heating dummy piece instead of a heating real piece. The heating dummy piece contacts the adjacent heating real pieces and conducts the heat generated by the heating real pieces during operation to the end region of the tube body 5. Since the heating dummy piece is arranged in the second cavity 52 near the end of the tube body 5 where the bottom cover 57 is located, it can conduct part of the heat generated by the heating element 6 axially to the end region of the tube body 5, making the temperature in this region more uniform with the temperature of other parts of the tube body 5, and avoiding the phenomenon of local low temperature caused by insufficient heat generation in the end region of the tube body 5. At the same time, as a solid filler, the heating dummy piece can also fill the gap at the end of the second cavity 52, so that the multiple heating elements 62 are kept in a tightly stacked state in the second cavity 52, preventing the heating elements 62 from axially shifting or colliding with each other under vehicle vibration environment, and improving the assembly stability of the heating element 6 in the tube body 5.

[0071] In the array of multiple heating tubes 4 in the heating core 2, only a single tube or a very small number of tubes 5 are selected to have a temperature measuring component 7 installed in their first cavity 51. The heating components 6 in the vast majority of the remaining tubes 5 do not require dummy heating elements. In other words, in the second cavity 52 of tubes 5 without a temperature measuring component 7, the position that originally corresponded to a dummy heating element is replaced with a real heating element. This allows for the arrangement of more heating elements 62 within the same tube length, maximizing the use of the limited space within the tube to increase the number of heating elements and the total heating power. This differentiated design fully considers that the temperature measuring function only needs to be implemented in a few tubes 5 to meet the temperature monitoring requirements of the entire heating device, while the remaining tubes 5 can use all their internal space for heating. This ensures the representativeness of temperature sampling and avoids the waste of heating space caused by reserving a temperature measuring cavity in each tube 5, achieving optimal overall power density while ensuring the temperature measuring function.

[0072] Preferably, the heating element 6 further includes a thermally conductive insulating film 64, which is disposed between the conductive electrode 61 and the inner wall of the second cavity 52, and covers the outer surfaces of the conductive electrode 61 and the heating element 62. The thermally conductive insulating film 64 forms an insulating layer with both thermal conductivity and insulation properties between the conductive electrode 61, the heating element 62, and the metal tube 5. The thermally conductive insulating film 64 electrically isolates the conductive electrode 61 and the heating element 62 from the tube 5, preventing high-voltage current from leaking through the tube 5 to the coolant or the housing 1, thus ensuring the electrical safety performance of the device. Furthermore, the thermally conductive insulating film 64 has excellent thermal conductivity, allowing the heat generated by the heating element 62 to be efficiently transferred through the thermally conductive insulating film 64 to the inner wall of the tube 5, and then conducted through the wall of the tube 5 to the external coolant. The thermally conductive insulating film 64 fully covers and adheres to the outer surfaces of the conductive electrode 61 and the heating element 62, eliminating air gaps between the conductive electrode 61, the heating element 62, and the inner wall of the tube 5. This avoids localized overheating and reduced heat transfer efficiency caused by air gaps, allowing the heat generated by the heating element 6 to be transferred outwards along the path with the lowest thermal resistance, further improving the heat exchange efficiency of the heating device. In addition, the thermally conductive insulating film 64 itself has a certain degree of flexibility and elasticity, which can buffer and tightly fit the heating element 62 and the conductive electrode 61 when they are installed in the second cavity 52, filling the tiny gaps between the components and ensuring that the entire heating element 6 is reliably positioned and constrained within the tube 5.

[0073] The specific usage process of the PTC heating device provided by this invention is as follows: In use, the coolant enters the heating device from the inlet 11 of the housing 1 under the drive of an external water pump. First, it passes through a first distribution plate 14 located at the inlet 11. Multiple first distribution channels 141 on the first distribution plate 14 evenly distribute the coolant into each medium flow channel 41 of the heating core 2. Subsequently, the coolant flows forward along the medium flow channel 41. During this process, the heating element 6 inside the tube 5 is energized, and the heating element 62 generates Joule heat. The heat is conducted through the thermally conductive insulating film 64 to the inner wall of the tube 5, and then transferred through the tube 5 wall to the outer surface of the tube 5, where it exchanges heat with the coolant flowing through the tube wall. The coolant is gradually heated as it flows across the surface of each tube 5. Meanwhile, within the tube body 5, which houses the temperature sensing component 7, the temperature sensing component 7 within the first cavity 51 forms a gapless heat conduction path with the inner wall of the tube body 5 via thermally conductive structural adhesive. The temperature of the heated liquid at the outer wall of the tube body 5 is rapidly transferred to the detection section 71 of the temperature sensing component 7 via the tube body 5 wall and the thermally conductive structural adhesive, enabling the sensor to detect the liquid temperature flowing through the tube body 5 in real time and transmit the temperature signal to the controller. The heated coolant continues to flow along the medium flow channel 41 to the outlet 12 side of the housing 1. Upon passing the second diversion plate 15, multiple second diversion channels 151 converge the coolant flowing from each medium flow channel 41 to the outlet 12. Subsequently, the coolant is discharged from the outlet 12 of the heating device and transported to the downstream air conditioning heater core or battery pack, completing the heating process of the circulating coolant.

[0074] Example 2 This invention also provides a control method for a PTC heating device. This method is applied to the PTC heating device provided in Embodiment 1, and controls the outlet water temperature of the heating device through temperature detection and power regulation. The control method includes the following steps: First, the liquid temperature signal detected in real time by the temperature measuring component 7 is obtained. Since the temperature measuring component 7 is located in the first cavity 51 of the heating tube 4, the temperature signal obtained by the detection part 71 of the temperature measuring component 7 can more accurately reflect the temperature of the coolant flowing through the surface of the heating tube 4.

[0075] In actual operation, to further improve the accuracy and reliability of temperature detection, multiple temperature sensing components 7 can be configured, each housed within the first cavity 51 of a different heating element 4. When acquiring temperature signals, multiple liquid temperature values ​​detected by the multiple temperature sensing components 7 are acquired. These values ​​are then validated to remove invalid temperature values ​​that exceed a preset reasonable range, such as abnormal jumps significantly deviating from the normal temperature range or erroneous values ​​caused by sensor malfunctions. Finally, a weighted average of the valid liquid temperature values ​​is calculated, and this weighted average is used as the final liquid temperature signal.

[0076] By using redundant sampling and weighted averaging of multiple temperature sensing components 7, the local temperature measurement deviation that may exist in a single temperature sensing component 7 or the temperature signal distortion caused by the failure of a single sensor is effectively avoided, thereby improving the robustness and representativeness of temperature acquisition and providing more reliable input data for subsequent power regulation.

[0077] Next, the actual outlet water temperature of the PTC heating device is determined based on the liquid temperature signal, while the target outlet water temperature preset by the system or set by the user is obtained.

[0078] When determining the actual outlet water temperature based on the liquid temperature signal, a heat transfer compensation model can be used to correct the real-time detection value.

[0079] Specifically, the real-time temperature value detected by the temperature measuring component 7 is obtained, and the operating parameters of the PTC heating device under the current operating conditions are also obtained. The operating parameters include at least one of the current power, liquid flow rate and ambient temperature. Then, heat transfer hysteresis compensation is performed on the real-time temperature value according to the operating parameters and the preset heat transfer compensation model.

[0080] Since there is a certain heat transfer path and response delay between the liquid medium and the detection element, by introducing dynamic parameters such as current power and liquid flow rate and calculating according to the heat transfer compensation model, the measurement deviation caused by heat transfer lag can be effectively compensated, so that the actual outlet water temperature obtained after compensation is closer to the true temperature of the medium.

[0081] Then, based on the deviation between the actual outlet water temperature and the target outlet water temperature, a power adjustment command is generated using a preset adjustment strategy. Specifically, the preset adjustment strategy includes: When the deviation value is greater than the preset first threshold, it indicates that the current actual water temperature is much lower or much higher than the target temperature, and a rapid response is needed to shorten the adjustment time. Therefore, the electrical power applied to the heating component 6 is adjusted at a larger first adjustment rate. When the deviation value is less than or equal to the first threshold and greater than the preset second threshold, it indicates that the actual outlet water temperature is close to the target temperature. At this time, the power is adjusted at a smaller second adjustment rate. The first adjustment rate is greater than the second adjustment rate to avoid temperature overshoot due to excessive adjustment.

[0082] Specifically, the operating modes of the PTC heating device are first obtained, including rapid heating mode, constant temperature maintenance mode, and energy-saving mode.

[0083] When the operating mode is rapid heating mode, the preset first threshold is increased and the first adjustment rate is increased, so that the heating device can increase power at a faster response speed within a large deviation range, so as to meet the needs of vehicles to heat up quickly in low temperature environments.

[0084] When the operating mode is constant temperature mode, the preset first threshold is reduced, and the current power is kept constant when the deviation value is within the preset dead zone range, so as to avoid unnecessary power adjustment due to small temperature fluctuations and keep the outlet water temperature stable near the target value.

[0085] When the operating mode is energy-saving mode, the upper limit of the power output is limited and an intermittent power output mode is adopted. Under the premise of meeting the basic heating needs, the power consumption is reduced as much as possible, which helps to extend the vehicle's driving range.

[0086] Based on this, the power adjustment command is also fed forward to compensate and correct according to the actual water temperature change rate within the preset time window, so as to offset the influence of the heater’s own thermal inertia on the temperature response. Finally, the corrected power adjustment command is output to the power control terminal of the heating component 6, so that the actual water temperature approaches the target water temperature.

[0087] By employing a segmented adjustment strategy in conjunction with feedforward compensation correction, temperature overshoot and oscillation can be effectively suppressed while ensuring the heating response speed.

[0088] In the specific implementation of feedforward compensation correction of power adjustment command based on the temperature change rate of actual outlet water temperature within a preset time window, the temperature change rate of actual outlet water temperature relative to time is first calculated. Then, the compensation power value is calculated based on the temperature change rate and the thermal inertia parameters of the PTC heating device. The compensation power value is positively correlated with the temperature change rate. Finally, the compensation power value is superimposed on the power adjustment command.

[0089] The rate of temperature change characterizes how quickly the outlet water temperature changes per unit time. When the rate of temperature change is large, it indicates that the temperature is in the process of rapid rise or rapid fall. If feedback adjustment is made only based on the deviation value, due to the thermal inertia of the heater, temperature overshoot or adjustment lag will often occur.

[0090] By incorporating the rate of temperature change into the feedforward compensation calculation, negative compensation power is superimposed when the temperature rises rapidly to reduce the heating power in advance, and positive compensation power is superimposed when the temperature drops rapidly to increase the heating power in advance. This effectively counteracts the temperature overshoot or temperature hysteresis caused by the heater's thermal inertia, making the temperature response curve smoother and improving the dynamic performance of temperature control.

[0091] To ensure the safe and reliable operation of the PTC heating device under various working conditions, this control method also integrates fault diagnosis and protection functions.

[0092] In one embodiment, the temperature change sequence of the actual outlet water temperature over multiple consecutive sampling periods is obtained. The temperature change trend at the current moment is calculated based on the temperature change sequence. If the temperature change trend indicates that the actual outlet water temperature is continuously rising at a rate greater than the preset heating rate and the deviation value is less than zero, that is, the actual temperature is continuously higher than the target temperature but the temperature rise rate is still too fast, it indicates that the heat output of the PTC heating device significantly exceeds the heat absorption capacity of the coolant. Abnormal operating conditions such as flow channel blockage or water pump stoppage causing liquid not to flow may have occurred. Based on this, it is determined that the heating device is in a dry-burning or low-liquid state, and a fault protection command is generated and the power output is interrupted, effectively avoiding damage to the heating element 4 or even safety accidents caused by dry burning.

[0093] In another implementation, a historical sequence of power adjustment commands can be acquired. Based on this sequence, the cumulative heat output of the PTC heating device is calculated. Simultaneously, the liquid inlet temperature and flow rate of the PTC heating device are acquired. The theoretical outlet water temperature is then calculated based on the cumulative heat output, liquid inlet temperature, and liquid flow rate. This theoretical outlet water temperature is calculated based on the principle of energy conservation and should be consistent with the actual outlet water temperature within a certain error range. The actual outlet water temperature is compared with the theoretical outlet water temperature. If the difference exceeds a preset third threshold, it indicates that the temperature detected by the temperature sensing component 7 is significantly inconsistent with the theoretically calculated value. Based on this, it is determined that the temperature sensing component 7 may have experienced a drift fault, and a calibration prompt signal is generated to remind the user or maintenance personnel to calibrate or replace the sensor, further improving the system's self-diagnostic capabilities and maintenance convenience.

[0094] Furthermore, this control method also supports coordinated control with the vehicle. Responding to a preheating command sent by the vehicle controller, the target power required to initiate preheating is calculated based on the target outlet water temperature, ambient temperature, and preset preheating time. This target power is then used to control the PTC heating device to start heating in advance, maintaining the actual outlet water temperature within the preset preheating temperature range before the vehicle controller issues the formal heating command. Through the preheating function, the vehicle can preheat the coolant to a suitable temperature using grid power during charging or before departure, allowing the air conditioning system to immediately deliver warm air upon the user's entry, eliminating the need to wait for the heating device's cold start process and improving user comfort. Simultaneously, since the preheating process can be completed during periods of lower electricity prices or by utilizing waste heat from charging, it also helps reduce overall vehicle energy consumption.

[0095] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A PTC heating device, characterized in that, include: The housing (1) has a liquid inlet (11) and a liquid outlet (12), and a flow channel (13) is formed inside the housing (1) to connect the liquid inlet (11) and the liquid outlet (12). Heating core (2) is disposed inside the housing (1). The heating core (2) includes an integrated plate (3) and a plurality of heating tubes (4) disposed on the integrated plate (3). A medium flow channel (41) connecting the flow channel (13) is formed between the outer walls of two adjacent heating tubes (4).

2. The PTC heating device according to claim 1, characterized in that, The inlet (11) and the outlet (12) are located on the same side of the housing (1). The medium flow channel (41) is divided into a first channel (411) and a second channel (412). The inlet (11) is connected to the first channel (411), and the outlet (12) is connected to the second channel (412). The flow channel (13) connects the first channel (411) and the second channel (412).

3. The PTC heating device according to claim 2, characterized in that, The housing (1) also includes a first flow divider (14) and a second flow divider (15); The first diversion plate (14) is disposed at the liquid inlet (11), and the first diversion plate (14) has a plurality of first diversion channels (141) that connect the liquid inlet (11) and the inlet of the first channel (411). The second diversion plate (15) is disposed at the liquid outlet (12), and the second diversion plate (15) has a plurality of second diversion channels (151) that connect the liquid outlet (12) and the outlet of the second channel (412).

4. The PTC heating device according to claim 1, characterized in that, A sealing structure is provided between the outer peripheral wall of the integrated plate (3) and the inner peripheral wall of the shell (1).

5. The PTC heating device according to claim 1, characterized in that, Multiple guide ridges (55) are provided on opposite sides of the heating tube (4). The guide ridges (55) extend along the axial direction of the heating tube (4), and the multiple guide ridges (55) are arranged at intervals along the circumference of the heating tube (4). The corresponding guide ridges (55) on two adjacent heating tubes (4) are connected to each other to form the axially penetrating medium flow channel (41).

6. A temperature-measuring heating element, characterized in that, The temperature-sensing heating element, used in any one of claims 1-5, comprises: The tube (5) has an axially extending partition (53) inside, which divides the inside of the tube (5) into a first cavity (51) and a second cavity (52). A heating element (6) is disposed within the second cavity (52); Temperature measuring component (7) is disposed in the first cavity (51).

7. The temperature-measuring heating tube according to claim 6, characterized in that, The heating component (6) includes a conductive electrode (61) and a plurality of heating elements (62). The plurality of heating elements (62) are arranged sequentially along the axial direction of the tube body (5). At least a portion of the heating elements (62) are connected to the conductive electrode (61). The conductive electrode (61) has a conductive portion (611) extending out of the tube body (5).

8. The temperature-measuring heating tube according to claim 7, characterized in that, The heating component (6) also includes a heat-conducting component (63). The heat-conducting component (63) is disposed inside the tube body (5) where the temperature measuring component (7) is located. The heat-conducting component (63) is connected to the heating component (62).

9. The temperature-measuring heating tube according to claim 7, characterized in that, The heating component (6) further includes a thermally conductive insulating film (64), which is disposed between the conductive electrode (61) and the inner wall of the second cavity (52) and covers the outer surface of the conductive electrode (61) and the heating element (62).

10. The temperature-measuring heating tube according to claim 6, characterized in that, The first cavity (51) is filled with a heat-conducting medium (54), and the temperature measuring component (7) is fixed in the first cavity (51) through the heat-conducting medium (54). The outer wall of the temperature measuring component (7) and the inner wall of the first cavity (51) are filled with the heat-conducting medium (54) to form a gapless heat conduction path.

11. The temperature-measuring heating tube according to claim 6, characterized in that, The partition (53) extends axially along the tube body (5), and the radial cross section of the partition (53) is arc-shaped, with the arc protruding from the second cavity (52) toward the first cavity (51).

12. The temperature-measuring heating tube according to claim 6, characterized in that, The temperature-measuring heating tube also includes a bottom cover (57), which is connected to one end of the tube body (5) along the axial direction and simultaneously seals the ports of the first cavity (51) and the second cavity (52). The bottom cover (57) is sealed to the tube body (5).

13. A control method for a PTC heating device, characterized in that, include: Acquire the liquid temperature signal detected in real time by the temperature measuring component (7); The actual outlet water temperature of the PTC heating device is determined based on the liquid temperature signal. Obtain the target outlet water temperature; Based on the deviation between the actual outlet water temperature and the target outlet water temperature, a power adjustment command is generated using a preset adjustment strategy. The preset adjustment strategy includes: when the deviation is greater than a preset first threshold, adjusting the electrical power applied to the heating component (6) at a first adjustment rate; when the deviation is less than or equal to the first threshold and greater than a preset second threshold, adjusting the electrical power at a second adjustment rate, wherein the first adjustment rate is greater than the second adjustment rate. The power adjustment command is corrected by feedforward compensation based on the actual water temperature change rate within a preset time window. The corrected power adjustment command is output to the power control terminal of the heating component (6) so that the actual outlet water temperature approaches the target outlet water temperature.

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