High-heat-conductivity PTC heating device with heat-conducting clamping sleeve

Abstract

The utility model discloses a high thermal conductivity PTC heating device with a heat conduction clamping sleeve, comprising a heat conduction housing provided with a heating cavity; the heating element comprises a mounting frame, a PTC (Positive Temperature Coefficient) resistor, a positive electrode plate, a negative electrode plate and a circuit polarity end arranged at the upper end of the positive electrode plate and the negative electrode plate, the mounting frame is vertically arranged in the heating cavity, and the PTC resistor is mounted in the mounting frame; the positive and negative electrode plates are respectively mounted on the front and back surfaces of the PTC positive temperature coefficient resistor and are fixed on the mounting frame; and the heat conduction clamping sleeve is inserted into the heating cavity and is used for tightly attaching the positive and negative electrode plates to the two sides of the PTC positive temperature coefficient resistor. By additionally arranging the heat dissipation insulating film and adopting the design of the inverted-U-shaped heat conduction clamping sleeve, heat distribution is optimized through tight attachment and physical pressure, contact resistance is reduced, and the conversion efficiency from electric energy to heat energy is remarkably improved.

Description

Technical Field

[0001] This utility model relates to the technical field of electric vehicle thermal management system, specifically to a high thermal conductivity PTC heating device with a thermally conductive sleeve. Background Technology

[0002] PTC (Positive Temperature Coefficient) heating devices are widely used in electric vehicle heating systems due to their self-regulating properties. Traditional PTC heating devices typically consist of a PTC thermistor element and conductors at both ends, forming different electrodes that generate heat when energized. To improve heating efficiency, thermally conductive silicone, powder filling, and powder coating are often used for heat conduction, and various shaped fixing devices are used to embed the PTC element into the housing requiring heat generation.

[0003] While traditional methods such as thermally conductive silicone, powder filling, and powder spraying achieve heat transfer to some extent, they are often limited by the thermal conductivity of the materials themselves and the limitations of the filling methods, resulting in insufficient heating efficiency and significant energy loss. Furthermore, some fixing devices are complex in design, increasing manufacturing costs and potentially involving patent protection, thus restricting the widespread adoption and application of the technology. Simultaneously, complex fixing structures may also affect the uniform distribution of heat, reducing heating efficiency. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the above-mentioned technical defects and provide a high thermal conductivity PTC heating device with a thermally conductive sleeve. The aim is to improve the heat transfer efficiency and reduce the thermal resistance through optimized structural design, so as to achieve a high-efficiency and safe heating process.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is: a high thermal conductivity PTC heating device with a thermally conductive sleeve, comprising:

[0006] A heat-conducting housing, which is provided with a heating cavity;

[0007] The heating element includes a mounting frame, a PTC positive temperature coefficient resistor, positive and negative electrode plates, and a circuit polarity terminal disposed on the upper end of the positive and negative electrode plates. The mounting frame is vertically disposed in the heating cavity. The PTC positive temperature coefficient resistor is mounted in the mounting frame. The positive and negative electrode plates are respectively mounted on the front and back sides of the PTC positive temperature coefficient resistor and fixed on the mounting frame.

[0008] The thermally conductive sleeve is inserted into the heating chamber to tightly bond the positive and negative electrode plates to both sides of the PTC positive temperature coefficient resistor.

[0009] Preferably, the positive and negative electrode sheets are provided with heat-dissipating insulating films on the sides away from the PTC positive temperature coefficient resistor, and the heat-dissipating insulating films and the inner walls of the heating cavity form mounting gaps for the insertion of heat-conducting sleeves.

[0010] Preferably, the heat-conducting sleeve is in the shape of an inverted U as a whole, comprising two symmetrically arranged wedge-shaped insertion parts and a connecting part connected above the two wedge-shaped insertion parts.

[0011] The two wedge-shaped insertion parts are respectively closely inserted into the mounting gaps on the two sides.

[0012] The connecting part is further provided with an opening for the insertion of the heating element, and the circuit polarity end extends through the opening and is bent to one side of the upper end of the opening.

[0013] Preferably, the bottom of the heating cavity is further provided with two auxiliary blocks, and the bottom of the heating element and the bottom of the wedge-shaped insertion part are respectively inserted into the insertion slots on the same side.

[0014] Compared with the prior art, the utility model has the advantages that:

[0015] By adding the heat-dissipating insulating film and adopting the inverted U-shaped heat-conducting sleeve design, the application effectively solves the problems of low heat-conducting efficiency and blocked heat transfer in the traditional device. The heat-dissipating insulating film improves the heat transfer efficiency while ensuring electrical safety, and the inverted U-shaped heat-conducting sleeve optimizes the heat distribution, reduces the contact resistance, and significantly improves the conversion efficiency of electrical energy to heat energy through close fitting and physical pressure.

[0016] In addition, the auxiliary block design at the bottom of the heating cavity not only enhances the stability of the heat-conducting sleeve, but also further enhances the heat conduction efficiency through the insertion slot structure, reducing heat loss. This design makes the thermal energy management of the entire device more efficient.

[0017] More importantly, the device structure of the application is simple, easy to manufacture and promote, and has high assembly convenience, improving production efficiency.

[0018] In summary, the application considers multiple aspects such as heat dissipation, heat conduction, stability and manufacturing efficiency, and realizes the overall optimization of the traditional PTC heating device, providing a more efficient and reliable solution for the thermal management system of electric vehicles. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is the internal structure schematic diagram of a high-heat-conducting PTC heating device with a heat-conducting sleeve.

[0020] Figure 2 is the external structure schematic diagram of a heating element in the application.

[0021] Figure 3 is the assembly structure diagram of the heat-conducting sleeve and the heating element in the application.

[0022] Figure 4 is the structure diagram of the heat-conducting sleeve in the application.

[0023] As shown in the figure: 1, a heat-conducting shell, 2, a heating cavity, 3, a mounting frame, 4, a PTC positive temperature coefficient resistor, 5, positive and negative electrode sheets, 51, circuit polarity ends, 6, a heat-conducting sleeve, 61, a wedge-shaped plug-in part, 62, a connecting part, 63, an opening, 7, a heat-dissipating insulating film, 8, a mounting gap, 9, an auxiliary block. DETAILED DESCRIPTION

[0024] The utility model will be made further detailed description in combination with the drawings.

[0025] The specific implementation of the utility model will be further described in combination with the drawings. The same parts are indicated by the same reference numerals.

[0026] It should be noted that the words "front", "back", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings, and the words "in" and "out" refer to the directions towards or away from the geometric center of a particular component.

[0027] In order to make the content of the utility model more easily understood clearly, the technical solutions in the utility model embodiments will be described clearly and completely in combination with the drawings in the utility model embodiments.

[0028] Referring to the drawings Figure 1 - the drawings Figure 2 A high-heat-conducting PTC heating device with a heat-conducting sleeve includes a heat-conducting shell 1, which is usually made of metal with high heat-conducting performance, such as aluminum or copper, and is provided with a heating cavity 2; a heating element, which includes a mounting frame 3, a PTC positive temperature coefficient resistor 4, positive and negative electrode sheets 5, and circuit polarity ends 51 arranged on the upper ends of the positive and negative electrode sheets 5, the mounting frame 3 is vertically arranged in the heating cavity 2, the PTC positive temperature coefficient resistor 4 is installed in the mounting frame 3, and the positive and negative electrode sheets 5 are respectively installed on the positive and negative surfaces of the PTC positive temperature coefficient resistor 4 and fixed to the mounting frame 3; a heat-conducting sleeve 6, which is also made of metal with high heat-conducting performance, such as aluminum or copper, is inserted into the heating cavity 2 and used to tightly fit the positive and negative electrode sheets 5 and the two sides of the PTC positive temperature coefficient resistor 4.

[0029] Building upon the basic structure, this embodiment further considers the heat dissipation and insulation of the heating element. To improve the heat dissipation efficiency of the positive and negative electrode plates 5 during operation and ensure electrical safety, a heat-dissipating insulating film 7 is added to both the positive and negative electrode plates 5 on the side away from the PTC positive temperature coefficient resistor 4. This heat-dissipating insulating film 7 not only serves as insulation to prevent high-voltage leakage but also does not affect heat transfer. In addition, an installation gap 8 is cleverly reserved between the heat-dissipating insulating film 7 and the inner wall of the heating chamber 2. This design not only provides the necessary space for the insertion of the thermally conductive sleeve 6 but also further optimizes the heat flow path inside the device, improving the overall thermal efficiency.

[0030] Regarding the structural design of the thermally conductive sleeve 6, this embodiment proposes an innovative inverted U-shaped structure. Specifically, refer to the attached... Figure 3 and attached Figure 4 The thermally conductive sleeve 6 consists of two symmetrical wedge-shaped insertion parts 61 and a connecting part 62 connecting them. These two wedge-shaped insertion parts 61 are tightly inserted into the previously mentioned mounting gap 8, ensuring a tight fit between the positive and negative electrode plates 5 and the PTC positive temperature coefficient resistor 4, reducing obstacles to heat transfer. Meanwhile, the opening 63 on the connecting part 62 not only facilitates the insertion of the heating element but also allows the circuit polarity terminal 51 to pass through and bend to extend to one side of the opening. This design ensures smooth circuit connection and facilitates the connection of an external power supply. Overall, this inverted U-shaped design not only enhances the structural stability but also optimizes heat distribution and improves heating efficiency.

[0031] To further improve the installation stability of the thermally conductive sleeve 6 and the heat management within the heating chamber 2, this embodiment adds two auxiliary blocks 9 to the bottom of the heating chamber 2. These two auxiliary blocks 9, together with the bottom of the heating element, form a slot, providing a precise insertion position for the bottom of the wedge-shaped insertion part 61. This not only ensures the secure installation of the thermally conductive sleeve 6 within the heating chamber 2, but also further enhances heat conduction efficiency and reduces heat loss through the slot structure. Furthermore, the design of the auxiliary blocks 9 also considers ease of assembly, making the assembly process of the entire device smoother and improving production efficiency.

[0032] Working principle: When the PTC positive temperature coefficient resistor 4 is connected to the power supply through the positive and negative electrode plates 5, according to the characteristics of PTC material, its resistance gradually increases with the increase of temperature, thereby limiting the further increase of current and avoiding overheating. At the same time, the PTC material releases a large amount of heat energy during the heating process.

[0033] The heat generated by the PTC positive temperature coefficient resistor 4 is firstly transferred to the positive and negative electrode sheets 5 in a direct heat conduction manner. Since the positive and negative electrode sheets 5 are made of high-thermal-conductivity material, they can quickly transfer the received heat to the heat-dissipating insulation film 7 thereon. The heat-dissipating insulation film 7, while playing a role of electrical isolation, also has certain heat-conducting performance, and it can further transfer the heat to the inner wall of the heating cavity 2.

[0034] The heat-conducting sleeve 6 is tightly inserted into the installation gap 8 through the wedge-shaped insertion part 61 in its unique inverted U-shaped structure, and realizes the tight adhesion to the positive and negative electrode sheets 5 and the PTC positive temperature coefficient resistor 4. Such adhesion not only ensures the effective heat transfer, but also enhances the electrical contact performance through physical pressure, reduces the contact resistance, and thus improves the conversion efficiency of electrical energy to heat energy. Meanwhile, the tight fit between the heat-conducting sleeve 6 and the heat-conducting shell 1 further reduces the thermal resistance, so that the heat can be more efficiently transferred to the cooling liquid.

[0035] The above describes the present application and its embodiments, which are not limited, and the embodiments shown in the drawings are only one of the embodiments of the present application, and the actual structure is not limited thereto. In summary, if a person skilled in the art is inspired by it, without departing from the creative purpose of the present application, without creative design, similar structure and embodiments of the technical solution can be designed, which should belong to the protection scope of the present application.

Claims

1. A high thermal conductivity PTC heating device with a thermally conductive sleeve, characterized in that, include: A heat-conducting housing (1) is provided with a heating cavity (2); The heating element includes a mounting frame (3), a PTC positive temperature coefficient resistor (4), positive and negative electrode plates (5), and a circuit polarity terminal (51) disposed on the upper end of the positive and negative electrode plates (5). The mounting frame (3) is vertically disposed in the heating cavity (2). The PTC positive temperature coefficient resistor (4) is mounted in the mounting frame (3). The positive and negative electrode plates (5) are respectively mounted on the front and back sides of the PTC positive temperature coefficient resistor (4) and fixed on the mounting frame (3). A thermally conductive sleeve (6) is inserted into the heating chamber (2) to tightly fit the positive and negative electrode plates (5) with the two sides of the PTC positive temperature coefficient resistor (4).

2. The high thermal conductivity PTC heating device with a thermally conductive sleeve according to claim 1, characterized in that, The positive and negative electrode plates (5) are provided with heat dissipation insulating film (7) on the side away from the PTC positive temperature coefficient resistor (4), and the heat dissipation insulating film (7) and the inner wall of the heating cavity (2) form an installation gap (8) for the insertion of the heat-conducting sleeve (6).

3. The high thermal conductivity PTC heating device with a thermally conductive sleeve according to claim 1, characterized in that, The thermally conductive sleeve (6) has an overall inverted U-shaped structure, which includes two symmetrically arranged wedge-shaped insertion parts (61) and a connecting part (62) connected above the two wedge-shaped insertion parts (61); Two wedge-shaped insertion parts (61) are tightly inserted into the installation gaps (8) on both sides; The connecting part (62) is also provided with an opening (63) for inserting the heating element, and the circuit polarity end (51) passes through the opening (63) and extends in a curved shape to one side of the upper end of the opening (63).

4. A high thermal conductivity PTC heating device with a thermally conductive sleeve according to claim 3, characterized in that, The bottom of the heating chamber (2) is also provided with two auxiliary blocks (9) opposite each other. The two auxiliary blocks (9) form slots with the bottom of the heating element and the bottom of the wedge-shaped insertion part (61) is inserted into the slot on the same side.

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