A temperature sensor and an assembly method thereof

Abstract

The present application discloses a temperature sensor and an assembly method thereof, wherein the temperature sensor assembly method comprises the following steps: S1. Temperature sensing part encapsulation, welding two groups of pins of the temperature sensing element, and sealing and encapsulating the temperature sensing element and the welding points between the temperature sensing element and the two groups of pins to form a temperature sensing head; S2. Wire processing, stripping the insulation layer of the two wire terminals in the cable, and exposing the end conductors; S3. Wire connection, the two pins are respectively and one by one corresponding to the two conductors and are respectively covered with sheaths, and the two sheaths are insulated, and then the sheath is pressed square so that the pins and conductors therein are in close contact; S4. Sleeve wrapping, inserting the sheath, the temperature sensing head and the cable end into a sleeve closed at one end; S5. Sealing, injecting sealant into the sleeve to fill the gap in the sleeve and overflow to the open end of the sleeve. The present application has a stable connection between the temperature sensing element and the conductor, and can effectively avoid the short and short circuit phenomenon of the temperature sensor during use.

Description

Technical Field

[0001] The present application relates to the field of temperature control sensors, and in particular to a temperature sensor and an assembly method thereof. Background Art

[0002] Temperature sensors are sensors that can sense temperature and convert it into usable output signals. They can be divided into contact and non-contact types according to the measurement method, and thermal resistors and thermocouples according to the sensor materials and electronic component characteristics. They are widely used in color TVs, computer color monitors, switching power supplies, water heaters, refrigerators, kitchen equipment, air conditioners, automobiles and other fields. With the rapid development of new energy vehicles, the requirements for temperature sensors used in automotive electronic systems are becoming more stringent.

[0003] In the related art, a Chinese patent with application number CN201310354379.1 proposes a waterproof and moisture-proof temperature sensor, including a temperature sensing element arranged in a housing and a connector arranged outside the housing and connected to the temperature sensing element, the temperature sensing element is provided with two groups of pins for connecting wires, and the surface of the temperature sensing element is provided with multiple layers of sealing layers for waterproofing and moisture-proofing; the sealing layer is a silicone layer; the silicone layer is three layers, wherein the first silicone layer wraps and seals the temperature sensing element; the second silicone layer wraps and seals the entire temperature sensing element and the welding point; the third silicone layer wraps and seals the entire temperature sensing element and the two groups of pins, and each silicone layer is wrapped with epoxy encapsulation material for protection. This application can work stably in a humid environment for a long time.

[0004] With respect to the above-mentioned related technologies, the inventors believe that the following defects exist: in the automotive application environment, the connection between the temperature sensor, especially the temperature sensing element and the cable must be stable and able to withstand vibration, impact and high temperature. In the related technology, the connection between the pins of the temperature sensing element and the wires in the cable is basically forward lap welding. In the case of complex operating environment, it is difficult to ensure a stable connection between the pins of the temperature sensing element and the wires. Especially when the car is driving at high speed, once the temperature sensor fails to break the circuit, it will cause immeasurable losses. Summary of the invention

[0005] In order to improve the problem of potential safety hazards in the connection between a temperature sensing element and a wire in an automobile temperature sensor, the present application provides a temperature sensor and an assembly method thereof.

[0006] A temperature sensor assembly method provided in the first aspect of the present application adopts the following technical solution:

[0007] A temperature sensor assembly method comprises the following steps:

[0008] S1. The temperature sensing part is packaged, the two sets of pins of the temperature sensing element are welded, and the temperature sensing element and the welding points between the temperature sensing element and the two sets of pins are sealed and packaged to form a temperature sensing head;

[0009] S2. Wire processing: stripping the insulation layer of the two wire terminals in the cable and exposing the end conductors;

[0010] S3. The wires are connected, and the two pins are closely attached to the two conductors one by one and are respectively covered with sheaths, and the two sheaths are insulated, and then the sheaths are pressed so that the pins and the conductors therein are closely attached;

[0011] S4. The sleeve is wrapped, and the sheath, the temperature sensing head and the cable end are inserted into the sleeve with one end closed;

[0012] S5. Sealing: injecting sealant into the sleeve until the sealant fills the space in the sleeve and overflows to the open end of the sleeve.

[0013] By adopting the above technical scheme, when assembling the temperature sensor, the welded pins and the temperature sensing element are sealed and packaged, which can significantly improve the connection strength and waterproof performance of the temperature sensor and the pins. Subsequently, the pins and the conductors are clamped by the sheath, which improves the connection strength between the pins and the conductors. It is not easy to separate under harsh use conditions, effectively ensuring the conductive stability of the temperature sensing element and the conductor, and avoiding short circuit or open circuit of the temperature sensor during use as much as possible, which is more convenient during processing; at the same time, the sheath, the temperature sensing head and the cable end are inserted into a sleeve with one end closed, and sealed with a sealant, so that the sleeve can firmly, tightly and hermetically package the temperature sensing head at the cable end, further protecting the connection between the temperature sensing head and the wire, making the connection between the two tighter and waterproof, thereby effectively avoiding short circuit and short circuit of the temperature sensor during use, with higher safety performance and more suitable for use in harsh environments.

[0014] Optionally, in step S3, after the sheath is squared, spot welding is performed.

[0015] By adopting the above technical solution, spot welding can further fix the pin and the conductor, improve the connection strength between the two, and is easy to process.

[0016] Optionally, in step S3, before putting on the sheath, the pins are first bent so that the distance between the two free ends of the pins matches the distance between the two conductors.

[0017] By adopting the above technical solution, when the sheath is installed, the pin can contact the conductor as much as possible, so that the electrical connection between the two is more stable, the sheath is installed more smoothly, and the processing efficiency is higher.

[0018] Optionally, in step S4, first ensure that the temperature sensing head is located on the side of the wire where the insulation layer is not stripped, and then insert the temperature sensing head and the wire into the sleeve.

[0019] By adopting the above technical solution, the temperature sensing head is arranged on the side of the wire where the insulation layer is not stripped off, thereby changing the traditional forward overlap that easily causes the temperature sensing head to be pulled, resulting in the electrical connection between the pin and the conductor to be easily detached. Therefore, even if the temperature sensor of the present application encounters the phenomenon of pulling on the temperature sensing head, the external pulling force will act more on the wire, reducing the probability of pulling on the electrical connection between the pin and the conductor, and improving the anti-pulling performance of the temperature sensor of the present application during use.

[0020] Optionally, in step S4, the opening end of the sleeve needs to extend at least to the insulation layer of the cable.

[0021] By adopting the above technical solution, after the internal gap of the sleeve is filled with glue, the cured sealant can be effectively bonded to the cable, which has a better packaging effect on the temperature sensor and can also effectively prevent the sleeve from falling off after being pulled.

[0022] Optionally, in step S5, a first layer of sealant is first injected into the sleeve, and after the first layer of sealant is cured, a water-swellable waterstop is filled in the gap between the sleeve and the cable, and then a second layer of sealant is poured and overflowed to the outside of the open end of the sleeve.

[0023] By adopting the above technical solution, the water-swellable waterstop is arranged at the open end of the casing, so that after long-term use in a humid environment, even if the sealing effect of the second layer of sealant on the casing and the cable is destroyed, when external water vapor penetrates into the water-swellable waterstop, the water-swellable waterstop expands and seals the gap between the casing and the cable more tightly, effectively isolating the possibility of further penetration of external water vapor into the first layer of sealant, thereby improving the normal working performance of the temperature sensor of the present application in extremely humid environments.

[0024] A temperature sensor provided in the second aspect of the present application adopts the following technical solution:

[0025] A temperature sensor, processed based on the above-mentioned temperature sensor transfer method, comprises a temperature sensing element, two pins electrically connected to the temperature sensing element, and a sheath for fastening the pins and one of the conductors of the cable is provided on the pins;

[0026] An end of the pin close to the temperature sensing element and the outside of the temperature sensing element are wrapped with a first packaging layer, and the three form a temperature sensing head, and the temperature sensing head is located on the side of the cable conductor where the insulation layer is not stripped;

[0027] The temperature sensing head is wrapped with a sleeve with a closed end, and the open end of the sleeve extends to the part of the cable where the insulation layer is not stripped off, and the internal space of the sleeve is filled with a second packaging layer.

[0028] By adopting the above technical scheme, the welded pins and the temperature sensing element are packaged by the first packaging layer, which can significantly improve the connection strength and waterproof performance of the temperature sensor and the pins, and the pins and the conductors are clamped by the sheath, which improves the connection strength between the pins and the conductors. It is not easy to separate under harsh use environments, effectively ensuring the conductive stability of the temperature sensing element and the conductor, and avoiding short circuit or open circuit of the temperature sensor during use as much as possible, and it is more convenient to process; at the same time, the sheath, the temperature sensing head and the cable end are inserted into a sleeve with one end closed, and sealed with a second packaging layer, so that the sleeve can firmly, tightly and hermetically package the temperature sensing head at the cable end, further protecting the connection between the temperature sensing head and the wire, making the connection between the two tighter and also waterproof, thereby effectively avoiding short circuit and open circuit of the temperature sensor during use, with higher safety performance and more suitable for use in harsh environments.

[0029] Optionally, an isolation ring made of insulating material is provided at the edge of the opening end of the sheath.

[0030] By adopting the above technical solution, the isolation ring can form a gap between the two sheaths, so that the sheaths can be insulated from each other after being inserted into the sleeve, until the second packaging layer is solidified to form permanent insulation of the two sheaths, thereby avoiding the short circuit between the two pins and the two conductors as much as possible.

[0031] Optionally, an insulating sheet for separating the two sheaths is fixedly connected to the inner wall of the sealing end of the sleeve.

[0032] By adopting the above technical solution, after the two sheaths are inserted into the sleeve, the insulating sheet insulates and separates the two sheaths, thereby avoiding the short circuit between the two pins and the two conductors as much as possible.

[0033] Optionally, the portion of the sleeve adjacent to its open end is provided with an enlarged section for accommodating a complete cable.

[0034] By adopting the above technical solution, the setting of the expanded section allows the sleeve to fit the temperature sensor, wires, and cables as closely as possible, while reserving sufficient filling space for the second packaging layer, thereby ensuring the stability of the overall structure of the applied temperature sensor.

[0035] In summary, the present application includes at least one of the following beneficial technical effects:

[0036] 1. The pins and conductors are clamped together by the sheath, which improves the connection strength between the pins and the conductors. It is not easy to separate in harsh use environments, effectively ensuring the conductive stability of the temperature sensing element and the conductor, and avoiding short circuit or open circuit of the temperature sensor during use as much as possible;

[0037] 2. The temperature sensing head is arranged on the side of the wire where the insulation layer is not stripped, which changes the traditional forward overlap that easily causes the temperature sensing head to be pulled and the electrical connection between the pin and the conductor to fall off. Even if the temperature sensor of the present application encounters the phenomenon of pulling the temperature sensing head, the external pulling force will act more on the wire, reducing the probability of pulling the electrical connection between the pin and the conductor, and improving the anti-pulling performance of the temperature sensor of the present application during use;

[0038] 3. A water-swellable waterstop is set at the open end of the casing, so that after long-term use in a humid environment, even if the sealing effect of the second layer of sealant on the casing and the cable is destroyed, when external water vapor penetrates into the water-swellable waterstop, the water-swellable waterstop expands and seals the gap between the casing and the cable more tightly, effectively isolating the possibility of further penetration of external water vapor into the first layer of sealant, thereby improving the normal working performance of the temperature sensor of the present application in extremely humid environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a cross-sectional view of the overall structure of the temperature sensor according to the embodiment of the present application.

[0040] Figure 2 It is a flow chart of the temperature sensor assembly method according to an embodiment of the present application.

[0041] Figure numerals: 1. temperature sensing head; 11. temperature sensing element; 12. pin; 2. cable; 21. wire; 22. conductor; 3. sheath; 4. casing; 41. expansion section; 5. water-swellable waterstop; 61. first packaging layer; 62. second packaging layer; 63. third packaging layer; 71. isolation ring; 72. insulating sheet. DETAILED DESCRIPTION

[0042] The following is combined with Figure 1-2 This application is described in further detail.

[0043] The present application embodiment discloses a temperature sensor. Figure 1The temperature sensor includes a temperature sensing element 11 and two pins 12 electrically connected to the temperature sensing element 11. The pin 12 is provided with a sheath 3 for fastening the pin 12 and one of the conductors 22 on the cable 2. One sheath 3 corresponds to one pin 12 and one conductor 22. The pin 12 and the conductor 22 are pressed and clamped in the sheath 3. The sheath 3 can be a copper sheath, an aluminum sheath, a lead sheath or a rubber sheath with an embedded metal layer, and the pin 12 and the conductor 22 are clamped by pressing.

[0044] After such arrangement, the connection strength between the pin 12 and the conductor 22 is significantly improved, and it is not easy to be separated in harsh use environments, which effectively ensures the conductive stability of the temperature sensing element 11 and the conductor 22, avoids short circuit or open circuit of the temperature sensor during use as much as possible, and is more convenient to process.

[0045] In other feasible implementations, after the sheath 3 is pressed square, the pin 12 and the conductor 22 may be further spot-welded to further fix the pin 12 and the conductor 22, thereby improving the connection strength between the two and simplifying the processing.

[0046] Reference Figure 1 The end of the pin 12 close to the temperature sensing element 11 and the outside of the temperature sensing element 11 are wrapped with a first packaging layer 61, and the three form a temperature sensing head 1, which is located on the side of the wire 21 of the cable 2 where the insulation layer is not stripped; the temperature sensing head 1 is wrapped with a sleeve 4 with one end closed, and the open end of the sleeve 4 extends to the part of the cable 2 where the insulation layer is not stripped, and the part of the sleeve 4 adjacent to its open end is provided with an expansion section 41 for accommodating the complete cable 2; the internal gap of the sleeve 4 is filled with a second packaging layer 62, and both the first packaging layer 61 and the second packaging layer 62 are made of epoxy encapsulation material.

[0047] The welded pins 12 and the temperature sensing element 11 are encapsulated by the first encapsulation layer 61, which can significantly improve the connection strength and waterproof performance of the temperature sensor and the pins 12; at the same time, the sheath 3, the temperature sensing head 1 and the end of the cable 2 are inserted into the sleeve 4 with one end closed, and sealed with the second encapsulation layer 62, so that the sleeve 4 can firmly, tightly and hermetically encapsulate the temperature sensing head 1 at the end of the cable 2, further protecting the connection between the temperature sensing head 1 and the wire 21, making the connection between the two tighter and also waterproof, thereby effectively avoiding short circuit and open circuit phenomena of the temperature sensor during use, with higher safety performance and more suitable for use in harsh environments.

[0048] When pouring the second packaging layer 62, it is necessary to ensure that the two sheaths 3 do not overlap each other to prevent short circuit between the two pins 12 and the two conductors 22. Figure 1In a feasible embodiment, an isolation ring 71 made of insulating material is provided at the edge of the open end of the sheath 3. Thus, after the two sheaths 3 are inserted into the sleeve 4, the isolation ring 71 can form a gap between the two sheaths 3, so that the sheaths 3 can be insulated from each other after being inserted into the sleeve 4, until the second packaging layer 62 is cured to form permanent insulation between the two sheaths 3, thereby avoiding the short circuit between the two pins 12 and the two conductors 22 as much as possible.

[0049] In another possible embodiment, referring to Figure 1 An insulating sheet 72 for separating the two sheaths 3 is fixedly connected to the inner wall of the sealed end of the sleeve 4. The insulating sheet 72 can be fixedly connected to the end wall of the sleeve 4 alone, or it can be integrally formed on the inner wall of the sleeve 4 to separate the inner end of the sleeve 4 into two cavities; thus, after the two sheaths 3 are inserted into the sleeve 4, the insulating sheet 72 insulates and separates the two sheaths 3, and can also avoid the short circuit between the two pins 12 and the two conductors 22 as much as possible.

[0050] In order to further improve the sealing and waterproof performance of this application, refer to Figure 1 , the second encapsulation layer 62 leaves a gap from the open end of the sleeve 4, and a water-absorbing member filled in the gap between the cable 2 and the sleeve 4 is arranged on the side of the second encapsulation layer 62 away from the sealed end of the sleeve 4. The water-absorbing member can be a water-swelling waterstop 5, an activated carbon layer, a silica gel layer, a water-absorbing resin or other water-absorbing material. In the embodiment of the present application, the water-absorbing member is set as a water-swelling waterstop 5 and is made into a ring and sleeved on the cable 2. Further, a third encapsulation layer 63 is arranged on the side of the water-absorbing member away from the second encapsulation layer 62, and the third encapsulation layer 63 fills the gap between the sleeve 4 and the cable 2 and extends to the outside of the free end of the sleeve 4.

[0051] The water-swellable waterstop 5 is arranged at the open end of the sleeve 4, so that after long-term use in a humid environment, even if the sealing effect of the third packaging layer 63 on the sleeve 4 and the cable 2 is destroyed, when external water vapor penetrates into the water-swellable waterstop 5, the water-swellable waterstop 5 expands and seals the gap between the sleeve 4 and the cable 2 more tightly, effectively isolating the possibility of further penetration of external water vapor into the second packaging layer 62, thereby improving the normal operating performance of the temperature sensor of the present application in an extremely humid environment.

[0052] The present application also discloses a temperature sensor assembly method for assembling the above-mentioned temperature sensor. Figure 2 , the temperature sensor assembly method comprises the following steps:

[0053] S1. Temperature sensing part packaging: weld the two groups of pins 12 of the temperature sensing element 11, and apply sealant to the temperature sensing element 11 and the welding points between the temperature sensing element 11 and the two groups of pins 12 to solidify into a first packaging layer 61 so that the three form a temperature sensing head 1.

[0054] S2. Processing the wire 21: stripping the outer insulation layer and the inner insulation layer of the cable 2 layer by layer, so that a part of the wire 21 in the cable 2 and a part of the conductor 22 in the wire 21 are exposed.

[0055] S3. The wire 21 is connected, and the pin 12 is first bent to make the distance between the free ends of the two pins 12 match the distance between the two conductors 22; then the two pins 12 are respectively placed in close contact with the two conductors 22 one by one and are respectively covered with sheaths 3, with insulation between the two sheaths 3, and then the sheaths 3 are pressed squarely to make the pins 12 and conductors 22 therein close contact; in other embodiments, after the pressing is completed, the pins 12 and conductors 22 can be further spot-welded.

[0056] S4. Wrap the sleeve 4, first ensure that the temperature sensor 1 is located on the side of the wire 21 where the insulation layer is not stripped, then insert the sheath 3, the temperature sensor 1 and the end of the cable 2 into the sleeve 4 with one end closed, and ensure that the two sheaths 3 are insulated, and the open end of the sleeve 4 must at least extend to the insulation layer of the cable 2.

[0057] S5. Sealing: injecting sealant into the sleeve 4 to form a second packaging layer 62, so that the sealant fills the gap in the sleeve 4 and overflows to the open end of the sleeve 4.

[0058] The pin 12 and the conductor 22 in the temperature sensor processed by the above-mentioned assembly method are clamped by the sheath 3, which improves the connection strength between the pin 12 and the conductor 22, and is not easy to separate under harsh use conditions, effectively ensuring the conductive stability of the temperature sensing element 11 and the conductor 22, and avoiding short circuit or open circuit of the temperature sensor during use as much as possible; at the same time, the temperature sensing head 1 is arranged on the side of the wire 21 where the insulation layer is not stripped, which changes the traditional forward overlap that easily causes the temperature sensing head 1 to be pulled and the electrical connection part of the pin 12 and the conductor 22 to fall off. Even if the temperature sensor of the present application encounters the pulling phenomenon of the temperature sensing head 1, the external pulling force will act more on the wire 21, reducing the probability of pulling the electrical connection part of the pin 12 and the conductor 22, improving the anti-pulling performance of the temperature sensor of the present application during use, and less prone to short circuit or open circuit.

[0059] In order to further improve the waterproofness of the temperature sensor made by this processing method, in step S5, a first layer of sealant is first injected into the sleeve 4. After the first layer of sealant is cured, a water-swellable waterstop 5 is filled in the gap between the sleeve 4 and the cable 2, and then a second layer of sealant is poured and overflows to the outside of the open end of the sleeve 4.

[0060] After such configuration, the water-swellable waterstop 5 is arranged at the open end of the sleeve 4, so that after long-term use in a humid environment, even if the sealing effect of the second layer of sealant on the sleeve 4 and the cable 2 is destroyed, when external water vapor penetrates into the water-swellable waterstop 5, the water-swellable waterstop 5 expands and seals the gap between the sleeve 4 and the cable 2 more tightly, effectively isolating the possibility of further external water vapor penetrating into the first layer of sealant, thereby improving the normal working performance of the temperature sensor of the present application in extremely humid environments.

[0061] The implementation principle of a temperature sensor and an assembly method thereof in an embodiment of the present application is as follows: the soldered pin 12 and the temperature sensing element 11 are packaged by the first packaging layer 61, which can significantly improve the connection strength and waterproof performance of the temperature sensor and the pin 12, and the pin 12 and the conductor 22 are clamped by the sheath 3 to improve the connection strength between the pin 12 and the conductor 22, and are not easy to separate under harsh use environments, effectively ensuring the conductive stability of the temperature sensing element 11 and the conductor 22, and avoiding short circuit or open circuit of the temperature sensor during use as much as possible, and making it more convenient to process; at the same time, the sheath 3, the temperature sensing head 1 and the end of the cable 2 are inserted into the sleeve 4 with one end closed, and sealed with the second packaging layer 62, so that the sleeve 4 can firmly, tightly and hermetically package the temperature sensing head 1 at the end of the cable 2, further protecting the connection between the temperature sensing head 1 and the wire 21, making the connection between the two tighter and also waterproof, thereby effectively avoiding short circuit and open circuit of the temperature sensor during use, having higher safety performance, and being more suitable for use in harsh environments.

[0062] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A temperature sensor, characterized in that: It comprises a temperature sensing element (11), two pins (12) electrically connected to the temperature sensing element (11), and a sheath (3) for fastening the pins (12) and one of the conductors (22) of the cable (2) on the pins (12); An end of the pin (12) close to the temperature sensing element (11) and the outside of the temperature sensing element (11) are wrapped with a first packaging layer (61), and the three together form a temperature sensing head (1), and the temperature sensing head (1) is located on a side of the wire (21) of the cable (2) from which the insulation layer has not been stripped; The temperature sensing head (1) is wrapped with a sleeve (4) with one end closed, and the open end of the sleeve (4) extends to a portion of the cable (2) where the insulation layer is not stripped off, and the internal space of the sleeve (4) is filled with a second packaging layer (62); A gap is provided between the second encapsulation layer (62) and the open end of the sleeve (4); a water-absorbing member filled in the gap between the cable (2) and the sleeve (4) is provided on the side of the sealed end of the second encapsulation layer (62) away from the sleeve (4); the water-absorbing member is provided as a water-swellable water-stopping strip (5) when in contact with water, and the water-absorbing member is made into an annular shape and sleeved on the cable (2); a third encapsulation layer (63) is provided on the side of the water-absorbing member away from the second encapsulation layer (62); the third encapsulation layer (63) fills the gap between the sleeve (4) and the cable (2) and extends to the outside of the free end of the sleeve (4); The temperature sensor is processed based on a temperature sensor assembly method, and the temperature sensor assembly method includes the following steps: S1. packaging the temperature sensing part, welding the two groups of pins (12) of the temperature sensing element (11), and sealing and packaging the temperature sensing element (11) and the welding points between the temperature sensing element (11) and the two groups of pins (12) to form a temperature sensing head (1); S2. Wire processing, stripping the insulation layer of the two wires (21) in the cable (2) and exposing the end conductors (22); S3. The wires are connected, and the two pins (12) are respectively placed in close contact with the two conductors (22) in a one-to-one correspondence and are respectively covered with sheaths (3), with the two sheaths (3) being insulated from each other, and then the sheaths (3) are pressed squarely so that the pins (12) and the conductors (22) therein are in close contact; S4. Wrapping with a casing, inserting the sheath (3), the temperature sensing head (1) and the end of the cable (2) into a casing (4) with one end closed; S5. Sealing: injecting sealant into the sleeve (4) until the sealant fills the space in the sleeve (4) and overflows to the open end of the sleeve (4); and, in step S5, first injecting a first layer of sealant into the sleeve (4), and after the first layer of sealant is cured, filling the gap between the sleeve (4) and the cable (2) with a water-swellable waterstop (5), and then pouring a second layer of sealant and overflowing to the outside of the open end of the sleeve (4).

2. A temperature sensor according to claim 1, characterized in that: An isolation ring (71) made of insulating material is provided at the edge of the open end of the sheath (3).

3. A temperature sensor according to claim 1, characterized in that: An insulating sheet (72) for separating the two sheaths (3) is fixedly connected to the inner wall of the sealed end of the sleeve (4).

4. A temperature sensor according to claim 1, characterized in that: The portion of the sleeve (4) adjacent to its open end is provided with an enlarged section (41) for accommodating a complete cable (2).

5. A temperature sensor according to claim 1, characterized in that: In the step S3, after the sheath (3) is squared, spot welding is performed.

6. A temperature sensor according to claim 1, characterized in that: In the step S3, before the sheath (3) is put on, the pins (12) are first bent so that the distance between the free ends of the two pins (12) matches the distance between the two conductors (22).

7. A temperature sensor according to claim 1, characterized in that: In the step S4, first ensure that the temperature sensing head (1) is located on the side of the wire (21) from which the insulation layer has not been stripped, and then insert the temperature sensing head (1) and the wire (21) into the sleeve (4).

8. A temperature sensor according to claim 1, characterized in that: In step S4, the opening end of the sleeve (4) needs to extend at least to the insulation layer of the cable (2).

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