Thermistor stable connection structure and method

Abstract

The invention discloses a stable connection structure and method for a thermistor, and the method comprises the steps: filling a thermistor lead and a corresponding wire into a cutting die groove of a riveting machine, and riveting a copper strip at the combination part of the thermistor lead and the wire through the riveting machine, thereby obtaining a riveted thermistor; performing riveting state detection on the riveted thermistor; the riveted thermistor with the qualified riveting state is placed in a machining station of welding equipment, current welding is conducted on the copper strip on the riveted thermistor, and the welded thermistor is obtained; and welding state detection is carried out on the welded thermistors, so that the thermistors with qualified connection are obtained. According to the copper strip riveting scheme, the thermistor lead and the wire are connected, after the copper strip is riveted, the riveting portion is reinforced through electric resistance welding, the copper strip reaches a molten state by means of electric resistance heat generated when electric resistance welding current passes through a workpiece contact face and an adjacent area, and finally a firm welding structure is formed under the action of pressure.

Description

Technical Field

[0001] The present invention relates to the technical field of resistance welding processing, and in particular to a thermistor stable connection structure and method. Background Art

[0002] Temperature monitoring is crucial for stable operation and optimized performance in new energy motors. These motors typically use thermistors for temperature detection, typically connected to the wires of the temperature measurement electrical circuit.

[0003] Conventional thermistor wiring processes include resistance welding, laser welding, copper strip riveting, and copper strip riveting followed by tinning. Resistance welding is generally performed by welding electrode positioning, which can easily cause cold solder joints at the thermistor welding site, resulting in short circuits in the thermistor and unstable resistance. Laser welding has poor welding results due to the small overlap between the wire and the thermistor lead, inaccurate laser positioning, and uneven energy distribution. Copper strip riveting uses copper strips to crimp the thermistor lead to the wire, but long-term use can easily lead to poor contact between the thermistor and the wire due to metal fatigue, and unstable resistance. When wiring is performed using the copper strip riveting followed by tinning, the solder has a low melting point, and when using fluoroplastics to encapsulate the thermistor, the solder will melt, causing a short circuit between the leads. Existing thermistor wiring processes generally use a single welding process, which cannot give a good balance between welding strength and stability. There is a risk of short circuits and resistance jumps under temperature alternation and vibration conditions, and it cannot well meet the high temperature requirements of thermistors in new energy oil-cooled motors during the fluoroplastic encapsulation process.

[0004] In the process of implementing the present invention, the inventors discovered that the prior art has at least the following problems:

[0005] The existing connection method of thermistors cannot well meet the user's usage needs. Summary of the Invention

[0006] The present invention aims to provide a stable thermistor connection structure and method to address the technical problem that existing thermistor connection methods do not adequately meet user requirements. The various technical effects achieved by the preferred technical solutions provided by the present invention are detailed below.

[0007] To achieve the above objectives, the present invention provides the following technical solutions:

[0008] The present invention provides a thermistor stable connection structure and method, comprising:

[0009] The thermistor lead and the corresponding wire are loaded into the die groove of the riveting machine, and the riveting machine rivets the copper strip to the junction of the thermistor lead and the wire to obtain the riveted thermistor;

[0010] Performing riveting status detection on the riveted thermistor;

[0011] placing the riveted thermistor that has passed the riveting state inspection into a processing position of a welding device, and performing current welding on the copper strip on the riveted thermistor to obtain a welded thermistor;

[0012] The welding state of the welded thermistor is detected to obtain a thermistor with qualified connection.

[0013] Optionally, the step of loading the thermistor lead and the corresponding wire into a die groove of a riveting machine, and riveting the copper strip to the junction of the thermistor lead and the wire to obtain the riveted thermistor comprises:

[0014] Turning on the riveting machine, pairing and pre-arranging the thermistor leads and the wires, and then translating the arranged thermistor leads and the wires into the corresponding die grooves;

[0015] The copper strip feeding mechanism on the riveting machine feeds the copper strip of a preset length to the top of the die groove;

[0016] The upper blade structure of the riveting machine cuts the copper strip, and then presses the cut copper strip downward into the lower blade structure of the riveting machine, and bends both sides of the copper strip downward to wrap around the thermistor lead and both sides of the wire until the copper strip is compressed to obtain a riveted thermistor.

[0017] Optionally, the pairing and pre-placing of the thermistor leads and the wires, and then translating the arranged thermistor leads and the wires into corresponding die grooves, comprises:

[0018] Placing the long pin of the thermistor lead on the short wire of the wire, and placing the short pin of the thermistor lead on the long wire of the wire, completing the matching and pre-arrangement of the thermistor lead and the wire;

[0019] After completing the matching and pre-arrangement of the thermistor lead and the wire, the long pin of the thermistor lead and the short wire of the wire are translated into the knife die groove where the short wire is placed, and at the same time, the short pin of the thermistor lead and the long wire of the wire are translated into the knife die groove where the long wire is placed to complete the wiring.

[0020] Optionally, the detecting the riveting state of the riveted thermistor includes:

[0021] placing the riveted thermistor under an electron microscope, and photographing the riveted thermistor with the electron microscope to obtain riveting image information of the riveted thermistor;

[0022] Comparing and analyzing the riveting image information with a preset product riveting status diagram to detect whether the riveting status of the thermistor after riveting is qualified;

[0023] If yes, the riveted thermistor that has passed the riveting state detection is placed in the processing position of the welding equipment for current welding;

[0024] If not, the riveted thermistor that fails the riveting state detection is placed in a defective product box.

[0025] Optionally, placing the riveted thermistor that has passed the riveting state detection into a processing position of a welding device, and performing current welding on the copper strip on the riveted thermistor to obtain the welded thermistor includes:

[0026] placing the copper strip on the riveted thermistor that has passed the riveting state inspection into the welding tank of the welding equipment;

[0027] The copper strip on the riveted thermistor is limited and fixed by the baffle of the welding groove, and the upper electrode of the welding groove moves downward to press the copper strip on the riveted thermistor;

[0028] After the upper electrode is in contact with the copper strip on the riveted thermistor, the welding power supply of the welding equipment outputs current to the upper electrode, causing the copper strip on the riveted thermistor to be melted and welded, thereby obtaining the welded thermistor.

[0029] Optionally, while the welding power supply of the welding equipment outputs current to the upper electrode to melt and weld the copper strip on the riveted thermistor, the method further comprises:

[0030] monitoring welding displacement, current output to the upper electrode, and welding time to determine whether power supply parameters for resistance welding are within a preset range;

[0031] If not, an abnormal prompt will be given;

[0032] If so, the upper electrode continues to melt and weld the copper strip on the riveted thermistor.

[0033] Optionally, the performing welding status detection on the welded thermistor to obtain a thermistor with qualified connection includes:

[0034] placing the welded thermistor under an electron microscope, and photographing the welded thermistor with the electron microscope to obtain welding image information of the welded thermistor;

[0035] Comparing and analyzing the preset product welding pass / fail diagram with the welding image information to detect whether the welding state of the thermistor after welding is qualified;

[0036] If yes, then the thermistor with qualified connection is obtained;

[0037] If not, the welded thermistor that fails the welding state detection is placed in a defective product box.

[0038] A thermistor stable connection structure, manufactured by the thermistor stable connection method described above, includes a copper strip, a thermistor lead and a wire to be connected, the copper strip being capable of wrapping the thermistor lead and the wire, and the thermistor lead abutting against the back of the copper strip, and the closed portion of the copper strip forming a tooth-like structure.

[0039] Optionally, anti-slip grooves are provided in the copper strip, and the anti-slip grooves are used to increase the contact area between the copper strip and the thermistor lead and the wire.

[0040] Optionally, the thickness of the copper strip is in the range of 0.08 mm to 0.45 mm, and the material of the copper strip is copper alloy; the material of the conductor of the wire is nickel-plated copper, and the material of the insulator of the wire is fluoroplastic.

[0041] Implementing one of the above technical solutions of the present invention has the following advantages or beneficial effects:

[0042] This invention uses a copper strip riveting scheme to connect the thermistor leads to the conductors. After the strips are riveted, resistance welding is used to reinforce the riveted joints. The resistance heat generated by the resistance welding current flowing through the workpiece contact surface and adjacent areas melts the copper strip, ultimately forming a strong welded structure under pressure. Furthermore, by using resistance welding instead of tinning with welding equipment, solder material costs are reduced and unit production efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work. In the drawings:

[0044] Figure 1 is a flow chart of embodiment 1 of the present invention;

[0045] Figure 2 This is a first structural diagram of the connection between the thermistor lead and the wire according to the second embodiment of the present invention;

[0046] Figure 3 This is a second structural diagram of the connection between the thermistor leads and the wires according to the second embodiment of the present invention;

[0047] Figure 4 is a cross-sectional view of the connection between the thermistor lead and the wire in the second embodiment of the present invention;

[0048] Figure 5 It is a mean-range control chart of the tensile strength test of an embodiment of the present invention.

[0049] In the figure: 1. Copper tape; 2. Thermistor lead; 3. Wire. DETAILED DESCRIPTION

[0050] In order to make the objects, technical solutions and advantages of the present invention clearer, the various exemplary embodiments to be described below will refer to the corresponding drawings, which constitute a part of the exemplary embodiments, in which various exemplary embodiments that may be used to implement the present invention are described. Unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation methods described in the following exemplary embodiments do not represent all implementation methods consistent with the present disclosure. It should be understood that they are only examples of processes, methods and devices that are consistent with some aspects of the present disclosure as detailed in the appended claims, and other embodiments may also be used, or structural and functional modifications may be made to the embodiments listed herein without departing from the scope and essence of the present invention.

[0051] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse" and the like indicate the orientation or positional relationship based on the figures, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the elements referred to must have a specific orientation, be constructed and operated in a specific orientation. The terms "first", "second" and the like are only used for descriptive purposes and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. The term "multiple" means two or more. The terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a communication connection, a direct connection, an indirect connection through an intermediate medium, and can be the internal connection of two elements or the interaction relationship between two elements. The term "and / or" includes any and all combinations of one or more related listed items. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0052] In order to illustrate the technical solution of the present invention, a specific embodiment is provided below, in which only the parts related to the embodiment of the present invention are shown.

[0053] Example 1:

[0054] like Figure 1 As shown, the present invention provides a thermistor stable connection method, comprising:

[0055] S10, loading the thermistor lead and the corresponding wire into the die groove of the riveting machine, and riveting the copper strip to the junction of the thermistor lead and the wire to obtain a riveted thermistor;

[0056] S20, detecting the riveting status of the riveted thermistor;

[0057] S30, placing the riveted thermistor that has passed the riveting state inspection into a processing position of a welding device, and performing current welding on the copper strip on the riveted thermistor to obtain a welded thermistor;

[0058] S40: Perform a welding status test on the thermistor after welding to obtain a qualified thermistor. Specifically, the present invention connects the thermistor lead and the conductor through a copper strip riveting scheme. After the copper strip is riveted, resistance welding is used to reinforce the riveted portion. The resistance heat generated by the resistance welding current passing through the workpiece contact surface and adjacent areas is used to melt the copper strip, ultimately forming a strong welded structure under pressure. Furthermore, by using resistance welding technology instead of tinning in welding equipment, the cost of soldering materials is reduced and the production efficiency of each piece is improved.

[0059] As an optional embodiment, the thermistor lead and the corresponding wire are loaded into the die groove of the riveting machine, and the riveting machine rivets the copper strip to the junction of the thermistor lead and the wire to obtain the riveted thermistor, including:

[0060] Turn on the riveting machine, match and pre-arrange the thermistor leads and wires, and then translate the arranged thermistor leads and wires into the corresponding die grooves;

[0061] The copper strip feeding mechanism on the riveting machine feeds a copper strip of a preset length to the top of the die groove;

[0062] The upper blade structure of the riveting machine cuts the copper strip, and then presses the cut copper strip downward into the lower blade structure of the riveting machine, and bends the two sides of the copper strip downward to wrap around the two sides of the thermistor leads and wires until the copper strip is compressed to obtain the riveted thermistor. Specifically, the arranged thermistor leads and wires are translated and loaded into the corresponding knife die grooves, which can avoid the position of the arranged thermistor leads and wires from changing, and ensure the tightness of the connection between the thermistor leads and wires. The copper strip feeding mechanism can feed continuously and can use a whole roll of copper strip, avoiding the terminal feeding causing part of the copper strip to be unusable, and can increase the material utilization rate to 98%.

[0063] As an optional embodiment, the thermistor leads and the wires are paired and pre-placed, and then the arranged thermistor leads and the wires are translated and placed into corresponding die grooves, including:

[0064] Place the long pin of the thermistor lead on the short wire of the conductor, and place the short pin of the thermistor lead on the long wire of the conductor to complete the matching and pre-arrangement of the thermistor lead and the conductor;

[0065] After the thermistor leads and wires are matched and pre-arranged, the long pins of the thermistor leads and the short wires of the wires are moved horizontally into the die grooves where the short wires are placed. Simultaneously, the short pins of the thermistor leads and the long wires of the wires are moved horizontally into the die grooves where the long wires are placed, completing the wiring. Specifically, the thermistor leads are placed above the wires so that when the copper tape is riveted from top to bottom to the junction of the thermistor leads and the wires, the thermistor leads can contact the back of the copper tape, preventing the thermistor leads from being pulled out of the closed copper tape. During the pairing process of the thermistor leads and the wires, the long pins of the thermistor leads need to be matched with the short wires of the wires, and the short pins of the thermistor leads need to be matched with the long wires of the wires, so that both pins of the thermistor leads can be connected to the wires. The riveting machine is equipped with two die grooves: one for the long pins of the thermistor leads and the short wires of the wires, and the other for the short pins of the thermistor leads and the long wires of the wires.

[0066] As an optional embodiment, performing riveting status detection on the riveted thermistor includes:

[0067] The riveted thermistor is placed under an electron microscope, and the electron microscope is used to photograph the riveted thermistor to obtain riveting image information of the riveted thermistor;

[0068] Compare and analyze the preset product riveting status diagram with the riveting image information to detect whether the riveting status of the thermistor after riveting is qualified;

[0069] If so, the riveted thermistor that has passed the riveting state detection is placed in the processing position of the welding equipment for current welding;

[0070] If not, the riveted thermistor that failed the riveting condition test is placed in a defective product box. Specifically, the riveted thermistor is placed under an electron microscope. The operator compares the image on the electron microscope screen with the defective content of the product riveting failure diagram to confirm whether the riveted thermistor is defective. The inspection locations include the copper strip, core wire, and riveted joints. After testing, the good products are placed in the processing station of the welding equipment for further processing, while the defective products are directly placed in the defective product box, which can improve production efficiency.

[0071] As an optional embodiment, a riveted thermistor that has passed the riveting state inspection is placed in a processing position of a welding device, and the copper strip on the riveted thermistor is subjected to current welding to obtain a welded thermistor, including:

[0072] Place the copper strip on the riveted thermistor that has passed the riveting state inspection into the welding tank of the welding equipment;

[0073] The copper strip on the riveted thermistor is limited and fixed by the baffle of the welding groove, and the upper electrode of the welding groove moves downward to press the copper strip on the riveted thermistor;

[0074] After the upper electrode contacts the riveted copper strip of the thermistor, the welding power supply of the welding equipment outputs current to the upper electrode, causing the copper strip on the riveted thermistor to melt and weld, thereby producing a welded thermistor. Specifically, the welding tank includes upper and lower electrodes and left and right baffles. The lower electrode supports the riveted copper strip of the thermistor and works in conjunction with the upper electrode to melt the riveted copper strip. The left and right baffles limit and secure the riveted copper strip, ensuring that the copper strip on the thermistor is stably positioned within the welding tank. After the copper strip on the riveted thermistor that has passed the riveting state inspection is placed in the welding tank, the welding equipment controls the upper electrode to move from top to bottom (i.e., moves toward the copper strip on the riveted thermistor), so that the upper electrode presses the copper strip on the riveted thermistor, and the welding power supply outputs current to the upper electrode and the lower electrode to melt the copper strip on the riveted thermistor, thereby melting the junction between the copper strip on the riveted thermistor and the thermistor lead and wire.

[0075] As an optional embodiment, while the welding power supply of the welding equipment outputs current to the upper electrode to melt and weld the copper strip on the riveted thermistor, the method further includes:

[0076] Monitor welding displacement, current output to the upper electrode and welding time to determine whether the power supply parameters of resistance welding are within the preset range;

[0077] If not, an abnormal prompt will be given;

[0078] If so, the upper electrode continues to melt and weld the copper strip on the riveted thermistor. Specifically, the welding displacement is obtained by the displacement sensor on the welding head of the welding equipment, and the current output to the upper electrode and the welding time are monitored by the monitoring instrument of the welding power supply. By obtaining the welding displacement, the current output to the upper electrode and the welding time, it is possible to detect in real time whether the power supply parameters of the resistance welding are within the preset range, so that abnormalities in the welding equipment can be discovered in time, ensuring the safety of the processing process and improving the yield rate. Abnormal prompts can be provided by sound alarms and / or light alarms.

[0079] As an optional embodiment, performing welding status detection on the thermistor after welding to obtain a thermistor with qualified connection includes:

[0080] The welded thermistor is placed under an electron microscope, and the electron microscope is used to photograph the welded thermistor to obtain welding image information of the welded thermistor;

[0081] Compare and analyze the preset product welding pass / fail diagram with the welding image information to detect whether the welding state of the thermistor after welding is qualified;

[0082] If so, a qualified thermistor is obtained;

[0083] If not, the thermistor after welding that fails the welding state test is placed in the defective product box. Specifically, when comparing and analyzing the welding state of the thermistor after welding based on the preset product welding pass / fail diagram and the welding image information, it can be analyzed whether there are phenomena such as missing welding, copper strip deformation, lack of wrapping, burrs, copper strip over-melting, copper strip misalignment, and wire skin burns, thereby determining whether the welding state of the thermistor after welding is qualified. When at least one of the above phenomena exists, the thermistor after welding is determined to be unqualified and is placed in the defective product box. The preset product welding pass / fail diagram is a diagram of the standard state, which facilitates the comparison of the image information of the actual object and the image information of the defective product.

[0084] Example 2:

[0085] like Figures 2 to 4As shown, a thermistor stable connection structure, manufactured by the thermistor stable connection method of Example 1, includes a copper strip 1, a thermistor lead 2, and a wire 3 to be connected. The copper strip 1 can wrap the thermistor lead 2 and the wire 3, and the thermistor lead 2 abuts the back of the copper strip 1. The closed portion of the copper strip 1 has a tooth-like structure. Specifically, the thermistor lead 2 is arranged at the back of the copper strip 1 to prevent the thermistor lead 2 from being dislodged from the closed portion of the copper strip 1. The closed portion of the copper strip 1 is configured as a tooth-like structure, preferably a W-shaped sawtooth shape, so that the closed portion of the copper strip 1 is staggered, which effectively prevents the wire 3 from being dislodged.

[0086] The present invention wraps a copper tape 1 around the junction of the thermistor lead 2 and the wire 3, and melts the copper tape 1 by resistance welding, thereby welding the copper tape 1 to the junction of the thermistor lead 2 and the wire 3, thereby further strengthening the stability of the connection between the thermistor lead 2 and the wire 3.

[0087] As an optional embodiment, the copper strip 1 is provided with anti-slip grooves to increase the contact area between the copper strip 1 and the thermistor leads 2 and the wire 3. Specifically, the anti-slip grooves provided in the copper strip 1 increase the contact area between the copper strip 1 and the thermistor leads 2 and the wire 3, thereby preventing the copper strip 1 from becoming detached and ensuring the stability of the portion where the copper strip 1 is riveted to the thermistor leads 2 and the wire 3.

[0088] As an optional embodiment, the thickness of copper strip 1 ranges from 0.08 mm to 0.45 mm. The copper strip 1 is made of a copper alloy, the conductor of wire 3 is made of nickel-plated copper, and the insulation of wire 3 is made of fluoroplastic. Specifically, the insulation of wire 3 is used to encapsulate the conductor of wire 3. The nickel-plated copper conductor and the fluoroplastic insulation of wire 3 meet the operating temperature range of wire 3 packaging. The thickness of copper strip 1 can be 0.3 mm.

[0089] More specifically, a qualified thermistor was mounted on a standard test stand, powered on with 5V in series, with a resistance of about 3.2kΩ. The thermistor was placed in an incubator at -40°C and +180°C for 15 minutes each, with the temperature transition lasting no longer than 30 seconds. The qualified thermistor was placed in the incubator for a temperature shock test of 1800 cycles. It was determined that the resistance fluctuation of the qualified thermistor was less than 1%. The test results are shown in Table 1:

[0090] Table 1

[0091]

[0092] Conduct a tensile strength test on the thermistors with qualified connections, select multiple samples continuously or randomly (such as 5 groups, 25 in each group), and measure the corresponding tensile strength of each sample according to the sample measurement value. Apply a tensile force of 125N to each sample when testing the tensile strength. Based on the tensile strength data of each sample obtained, determine the sum of the tensile strengths of each sample in the 5 groups, the average value of the real-time data, and the range of two adjacent groups. The judgment conditions for the measured values ​​are that the mean is greater than the upper limit of the specification and the range is less than the lower limit of the specification. The upper limit of the mean chart is 67, the lower limit of the mean chart is 57, the upper limit of the range chart is 19.07, and the lower limit of the range chart is 0. The mean and range values ​​of the real-time data obtained from multiple samples are used to make corresponding mean control charts and range control charts, and the samples are subjected to manufacturing capability analysis to determine the product grade of the thermistors with qualified connections. The test results are as follows: Figure 5 As shown, it can be determined that the breaking force of the qualified thermistor of the present invention is above 50N, which is twice the specified value (25N).

[0093] The foregoing is merely a preferred embodiment of the present invention. Those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. Furthermore, under the guidance of the present invention, these features and embodiments may be modified to suit specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be within the scope of the present invention.

Claims

1. A method for stably connecting a thermistor, characterized in that: include: The thermistor lead and the corresponding wire are loaded into the die groove of the riveting machine, and the riveting machine rivets the copper strip to the junction of the thermistor lead and the wire to obtain the riveted thermistor; Performing riveting status detection on the riveted thermistor; placing the riveted thermistor that has passed the riveting state inspection into a processing position of a welding device, and performing current welding on the copper strip on the riveted thermistor to obtain a welded thermistor; The welding state of the welded thermistor is detected to obtain a thermistor with qualified connection.

2. The thermistor stable connection method according to claim 1, characterized in that: The method comprises: loading the thermistor lead wire and the corresponding wire into the die groove of the riveting machine, and riveting the copper strip to the joint portion of the thermistor lead wire and the wire to obtain the riveted thermistor, comprising: Turning on the riveting machine, pairing and pre-arranging the thermistor leads and the wires, and then translating the arranged thermistor leads and the wires into the corresponding die grooves; The copper strip feeding mechanism on the riveting machine feeds the copper strip of a preset length to the top of the die groove; The upper blade structure of the riveting machine cuts the copper strip, and then presses the cut copper strip downward into the lower blade structure of the riveting machine, and bends both sides of the copper strip downward to wrap around the thermistor lead and both sides of the wire until the copper strip is compressed to obtain a riveted thermistor.

3. The thermistor stable connection method according to claim 2, characterized in that: The method of pairing and pre-placing the thermistor leads and the wires, and then translating the arranged thermistor leads and the wires into corresponding die grooves, comprises: Placing the long pin of the thermistor lead on the short wire of the wire, and placing the short pin of the thermistor lead on the long wire of the wire, completing the matching and pre-arrangement of the thermistor lead and the wire; After completing the matching and pre-arrangement of the thermistor lead and the wire, the long pin of the thermistor lead and the short wire of the wire are translated into the knife die groove where the short wire is placed, and at the same time, the short pin of the thermistor lead and the long wire of the wire are translated into the knife die groove where the long wire is placed to complete the wiring.

4. The thermistor stable connection method according to claim 1, characterized in that: The riveting state detection of the riveted thermistor includes: placing the riveted thermistor under an electron microscope, and photographing the riveted thermistor with the electron microscope to obtain riveting image information of the riveted thermistor; Comparing and analyzing the riveting image information with a preset product riveting status diagram to detect whether the riveting status of the thermistor after riveting is qualified; If yes, the riveted thermistor that has passed the riveting state detection is placed in the processing position of the welding equipment for current welding; If not, the riveted thermistor that fails the riveting state detection is placed in a defective product box.

5. The thermistor stable connection method according to claim 1, characterized in that: The method of placing the riveted thermistor having passed the riveting state detection into a processing position of a welding device, and performing current welding on the copper strip on the riveted thermistor to obtain the welded thermistor comprises: placing the copper strip on the riveted thermistor that has passed the riveting state inspection into the welding tank of the welding equipment; The copper strip on the riveted thermistor is limited and fixed by the baffle of the welding groove, and the upper electrode of the welding groove moves downward to press the copper strip on the riveted thermistor; After the upper electrode is in contact with the copper strip on the riveted thermistor, the welding power supply of the welding equipment outputs current to the upper electrode, causing the copper strip on the riveted thermistor to be melted and welded, thereby obtaining the welded thermistor.

6. The thermistor stable connection method according to claim 5, characterized in that: When the welding power supply of the welding equipment outputs current to the upper electrode so that the copper strip on the riveted thermistor is melted and welded, the method further comprises: monitoring welding displacement, current output to the upper electrode, and welding time to determine whether power supply parameters for resistance welding are within a preset range; If not, an abnormal prompt will be given; If so, the upper electrode continues to melt and weld the copper strip on the riveted thermistor.

7. The thermistor stable connection method according to claim 1, characterized in that: The step of detecting the welding state of the welded thermistor to obtain a qualified thermistor includes: placing the welded thermistor under an electron microscope, and photographing the welded thermistor with the electron microscope to obtain welding image information of the welded thermistor; Comparing and analyzing the preset product welding pass / fail diagram with the welding image information to detect whether the welding state of the thermistor after welding is qualified; If yes, then the thermistor with qualified connection is obtained; If not, the welded thermistor that fails the welding state detection is placed in a defective product box.

8. A thermistor stable connection structure, characterized in that: The device is manufactured by the method for stably connecting a thermistor according to any one of claims 1 to 7, comprising a copper strip, a thermistor lead and a wire to be connected, wherein the copper strip can wrap the thermistor lead and the wire, and the thermistor lead abuts against the back of the copper strip, and the closed portion of the copper strip is a tooth-like structure.

9. The thermistor stable connection structure according to claim 8, characterized in that: Anti-slip grooves are provided in the copper strip, and the anti-slip grooves are used to increase the contact area between the copper strip, the thermistor lead and the wire.

10. The thermistor stable connection structure according to claim 9, characterized in that: The thickness of the copper strip is in the range of 0.08 mm to 0.45 mm, and the material of the copper strip is copper alloy; the material of the conductor of the wire is nickel-plated copper, and the material of the insulator of the wire is fluoroplastic.

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