NTC (Negative Temperature Coefficient) wire connecting and fixing structure

Abstract

The utility model discloses an NTC wire connecting and fixing structure, which comprises an NTC connecting wire and a target connecting wire, the diameter of the target connecting wire is larger than that of the NTC connecting wire, the NTC connecting wire comprises an NTC pin section and an NTC insulation skin wrapping section, the target connecting wire comprises a target wire pin section and a target wire insulation skin wrapping section, and the NTC pin section is spirally wound and connected with the target wire pin section. According to the utility model, the relatively thin NTC connecting line and the relatively thick target connecting line are connected in a spiral winding manner, so that the problem that the line is easy to break in the prior art is effectively solved, the connection stability is greatly improved, the NTC can be ensured to continuously and stably work in the automobile seat heating system, and the service life of the NTC is prolonged. The problems of temperature regulation failure and the like caused by unstable connection are avoided, and meanwhile, the problem that the modes such as direct lap welding and the like do not conform to the IPC620 international standard is successfully avoided.

Description

Technical Field

[0001] This utility model relates to the field of automobile manufacturing technology, and in particular to an NTC wire connection and fixing structure. Background Technology

[0002] In automotive seat heating systems, the temperature sensor (NTC) plays a crucial role in enabling automatic seat heating and temperature regulation. Currently, most automotive seat heating cables on the market require connection to an NTC; however, there are several common connection methods between the NTC and the automotive seat cable.

[0003] The first method is the commonly used wire-to-wire connection method, such as using connector riveting for transition. Because the NTC wire is extremely thin (the specification is 28AWG, which is made of 19 silver-plated copper wires with a diameter of only 0.082mm twisted together, and the total conductor diameter is only 0.41mm), the NTC wire is very easy to be riveted off during the riveting process, which cannot guarantee the stability and reliability of the connection.

[0004] The second method, direct lap soldering, butt soldering, or overlapping connection, eliminates the need for connectors, but according to the IPC620 international standard, this method has significant drawbacks. During the connection process, the wires are prone to warping, the lap length is difficult to control precisely, and the gap between the two wires cannot be effectively managed. This not only affects the strength of the connection but may also adversely affect circuit performance.

[0005] The third approach attempts to solve the connection problem using ultrasonic welding. However, practical experience has shown that this method is not feasible. The specific reason is that NTC wires are extremely thin, and the pressure from the two welding tips in ultrasonic welding cannot be transmitted (ultrasonic welding requires pressure). Furthermore, while welding can sense pressure, it inevitably involves serrations. These serrations are necessary for effectively sensing and transmitting pressure, but they can damage the conductor. Since there are no flat welding tips available in the industry, flat welding tips cannot transmit pressure, and the serrations would also damage the conductor.

[0006] The fourth method is to replace the connector with a riveted copper strip. It is essentially similar to using a connector for riveting. Because the NTC wire is too thin, there is a risk of the NTC wire pins breaking during riveting, which is difficult to meet the needs of practical applications.

[0007] In summary, current automotive seat heating wire and NTC connection technologies have many shortcomings in terms of stability, reliability, and compliance with international standards. Existing connection methods are insufficient to meet the high-quality requirements of automotive seat heating systems for NTC connections. Utility Model Content

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide an NTC wire connection and fixing structure.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] This utility model provides an NTC wire connection and fixing structure, including an NTC connecting wire and a target connecting wire. The diameter of the target connecting wire is larger than the diameter of the NTC connecting wire. The NTC connecting wire includes an NTC pin segment and an NTC insulation-wrapped segment. The target connecting wire includes a target wire pin segment and a target wire insulation-wrapped segment. The NTC pin segment and the target wire pin segment are spirally wound together.

[0011] Furthermore, the NTC pin segment is spirally wound around the target line pin segment along the length direction of the target line pin segment.

[0012] Furthermore, when the NTC pin segment and the target line pin segment are spirally wound, the target line insulation wrapping segment and the NTC insulation wrapping segment are placed in the same direction.

[0013] Furthermore, when the NTC pin segment and the target line pin segment are spirally wound, the end face of the target line insulation wrapping segment is aligned with the end face of the NTC insulation wrapping segment.

[0014] Furthermore, when the NTC pin segment and the target line pin segment are spirally wound, the number of spiral winding turns is 3 to 4.

[0015] Furthermore, the portion where the NTC pin segment and the target line pin segment are spirally wound is provided with a metal coating.

[0016] Furthermore, the metal coating is solid tin.

[0017] Furthermore, the metal coating is spaced apart from the end of the NTC insulation wrapping segment and the end of the target wire insulation wrapping segment.

[0018] Furthermore, the distance between the metal coating and the end of the NTC insulation wrapping section and the end of the target wire insulation wrapping section is 0.7 mm to 1.2 mm.

[0019] Furthermore, the target connecting line is a car seat heating line.

[0020] The beneficial effects of this utility model compared with the prior art are as follows: An NTC wire connection and fixing structure includes an NTC connecting wire and a target connecting wire. The diameter of the target connecting wire is larger than that of the NTC connecting wire. The NTC connecting wire includes an NTC pin segment and an NTC insulation-wrapped segment. The target connecting wire includes a target wire pin segment and a target wire insulation-wrapped segment. The NTC pin segment and the target wire pin segment are spirally wound together. This utility model effectively solves the problem of easy wire breakage in the prior art by connecting the relatively thin NTC connecting wire and the relatively thick target connecting wire through spiral winding, greatly improving the stability of the connection, ensuring that the NTC can work continuously and stably in the automotive seat heating system, avoiding problems such as temperature regulation failure due to unstable connection, and successfully avoiding the problem of direct lap welding and other methods not conforming to the IPC620 international standard.

[0021] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model, it can be implemented according to the contents of the specification. In order to make the above and other objectives, features and advantages of this utility model more obvious and easy to understand, the following are preferred embodiments, which are described in detail below. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of screw winding for an NTC wire connection and fixing structure provided in a specific embodiment of this utility model;

[0024] Figure 2 This is a schematic diagram of the NTC connecting wire in an NTC wire connection fixing structure provided for a specific embodiment of this utility model.

[0025] Figure Labels

[0026] 1. NTC connector; 11. NTC pin segment; 12. NTC insulation wrapping segment; 2. Target connector; 21. Target pin; 22. Target insulation wrapping segment. Detailed Implementation

[0027] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0033] like Figure 1 and Figure 2 As shown, this utility model embodiment provides an NTC wire connection and fixing structure, including an NTC connecting wire 1 and a target connecting wire 2. The diameter of the target connecting wire 2 is larger than the diameter of the NTC connecting wire 1. The NTC connecting wire 1 includes an NTC pin segment 11 and an NTC insulation wrapping segment 12. The target connecting wire 2 includes a target wire pin segment 21 and a target wire insulation wrapping segment 22. The NTC pin segment 11 and the target wire pin segment 21 are spirally wound together.

[0034] NTC pin segment 11, as a key component for electrical connection with target connection line 2, is typically made of a material with good conductivity, such as silver-plated copper. Taking the NTC connection line 1 used in a common automotive seat heating system as an example, its NTC pin segment 11 is 28AWG in size, composed of 19 strands of silver-plated copper wire with a diameter of 0.082mm twisted together. This gives the NTC pin segment 11 good flexibility and conductivity, enabling it to accurately sense temperature changes and transmit signals. The NTC insulation-wrapped segment 12 is made of a material with good insulation properties, such as polyvinyl chloride (PVC), and its outer diameter is typically 0.62mm.

[0035] The target connecting wire 2 is a car seat heating wire, which uses an insulation material similar to that of NTC insulation-wrapped section 12.

[0036] In practice, the NTC pin segment 11 is tightly spirally wound along the length of the target line pin segment 21. For example, the operator holds the NTC connector 1, aligns one end of the NTC pin segment 11 with one end of the target line pin segment 21, and then evenly and tightly winds the NTC pin segment 11 around the target line pin segment 21 in a clockwise or counterclockwise direction.

[0037] During the winding process, ensure that the target wire insulation wrapping section 22 and the NTC insulation wrapping section 12 are placed in the same direction. This helps prevent a decrease in insulation performance due to mutual compression or twisting of the insulation sheets during subsequent use. Simultaneously, try to align the end face of the target wire insulation wrapping section 22 with the end face of the NTC insulation wrapping section 12.

[0038] When spirally winding NTC pin segment 11 and target line pin segment 21, it is appropriate to set the number of spiral windings to 3 to 4 turns. If the number of windings is too few, such as only 1 to 2 turns, the connection will be greatly reduced, and it is easy to loosen or even fall off under conditions such as vibration of car seats; if the number of windings is too many, such as more than 5 turns, it will not only increase the difficulty of operation and time cost, but may also cause the pin segment to bend excessively, reduce its mechanical strength, and increase the risk of wire breakage.

[0039] In one embodiment, the portion where the NTC pin segment 11 and the target line pin segment 21 are spirally wound is provided with a metal coating, typically solid tin.

[0040] After spiral winding is completed, the wound portion is immersed in molten solder for immersion soldering. Taking the connection between the car seat heating wire and the NTC connection wire 1 as an example, during immersion soldering, the wound pin segment is dipped in flux or rosin and then slowly immersed in the solder bath. The immersion temperature is approximately 250 to 290 degrees Celsius, and the immersion time is 1 to 2 seconds. The molten solder will quickly fill the gaps between the pin segments. After the molten solder cools and solidifies, a strong solid solder coating is formed. This solid solder coating not only further enhances the mechanical connection strength between the NTC pin segment 11 and the target line pin segment 21, preventing loosening, but also significantly improves the stability and conductivity of the electrical connection and reduces contact resistance.

[0041] The metal coating is spaced apart from the ends of the NTC insulation wrapping section 12 and the target line insulation wrapping section 22. The spacing is set to 0.7mm to 1.2mm. This is because if the metal coating is too close to the end of the insulation wrapping section, during use, due to factors such as vibration, the metal coating may rub against the insulation, causing damage and creating a safety hazard. On the other hand, if the spacing is too large, it will affect the protective and reinforcing effect of the metal coating on the pin connection. For example, in actual production, when the spacing is controlled at around 1mm, the insulation did not break after long-term high and low temperature cycle testing and vibration testing, and the performance of the connection remained stable.

[0042] Through spiral winding and the application of a solid tin coating, the connection between NTC pin segment 11 and target line pin segment 21 becomes extremely robust. Compared to traditional connector riveting methods, this avoids the problem of NTC pin segment 11 breaking due to improper riveting force; compared to methods such as direct lap soldering, it eliminates the drawbacks of wire lifting, difficulty in controlling lap length and gaps. In the actual operation of the automotive seat heating system, even under frequent seat vibrations during vehicle operation, the connection remains stable without loosening or breakage, ensuring that the NTC can continuously and stably sense the seat temperature and control the heating system's operation, greatly improving the reliability of the seat heating system.

[0043] At the same time, it successfully avoided the problem that direct lap welding and other methods do not comply with the IPC620 international standard.

[0044] Furthermore, the entire process of implementing the connection and fixing structure does not require complex equipment or advanced technical processes. Compared to processes such as ultrasonic welding, which require specialized equipment and complex debugging, operators can master the skills with simple training. Since expensive connectors and other accessories are not needed, raw material costs are reduced.

[0045] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. An NTC wire connection and fixing structure, characterized in that, It includes an NTC connecting line and a target connecting line, wherein the diameter of the target connecting line is larger than the diameter of the NTC connecting line, the NTC connecting line includes an NTC pin segment and an NTC insulation-wrapped segment, and the target connecting line includes a target line pin segment and a target line insulation-wrapped segment, wherein the NTC pin segment and the target line pin segment are spirally wound together.

2. The NTC wire connection and fixing structure according to claim 1, characterized in that, The NTC pin segment is spirally wound around the target line pin segment along the length direction of the target line pin segment.

3. The NTC wire connection and fixing structure according to claim 1, characterized in that, When the NTC pin segment and the target line pin segment are spirally wound, the target line insulation wrapping segment and the NTC insulation wrapping segment are placed in the same direction.

4. The NTC wire connection and fixing structure according to claim 1, characterized in that, When the NTC pin segment and the target line pin segment are spirally wound, the end face of the target line insulation wrapping segment is aligned with the end face of the NTC insulation wrapping segment.

5. The NTC wire connection and fixing structure according to claim 1, characterized in that, When the NTC pin segment and the target line pin segment are spirally wound, the number of spiral winding turns is 3 to 4.

6. An NTC wire connection and fixing structure according to any one of claims 1-5, characterized in that, The portion where the NTC pin segment and the target line pin segment are spirally wound together is coated with a metal coating.

7. The NTC wire connection and fixing structure according to claim 6, characterized in that, The metal coating is solid tin.

8. The NTC wire connection and fixing structure according to claim 6, characterized in that, The metal coating is spaced apart from the end of the NTC insulation wrapping section and the end of the target wire insulation wrapping section.

9. The NTC wire connection and fixing structure according to claim 8, characterized in that, The distance between the metal coating and the end of the NTC insulation wrapping section and the end of the target line insulation wrapping section is 0.7 mm to 1.2 mm.

10. The NTC wire connection and fixing structure according to claim 1, characterized in that, The target connection line is a car seat heating wire.

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