Micro to device soldering method

Abstract

This invention discloses a method for welding miniature TO devices. A welding device is used to position and weld a tube base and a tube cap. The welding device includes an upper electrode, a lower electrode, and a limiting cylinder. The lower electrode has a first through hole, and the upper electrode has a second through hole. The first and second through holes are coaxially connected. The tube base includes a body and leads, and the tube cap has a main body and a flange. The inner diameter of the second through hole is larger than the outer diameter of the main body but smaller than the outer diameter of the flange. This invention assembles the miniature TO device with the tube base at the bottom and the tube cap at the top, allowing the upper and lower electrodes to press the assembled miniature TO device together. The limiting cylinder further limits and fixes the upper and lower electrodes, ensuring that the upper electrode, lower electrode, tube base, and tube cap form a stable whole. This welding method better protects the tube base and tube cap. Additionally, the upper electrode used to press the tube cap has a rounded chamfer that matches the rounded angle of the tube cap, further protecting the tube cap from damage during the welding process.

Description

Technical Field

[0001] This invention relates to the field of TO device welding technology, and in particular to a welding method for miniature TO devices. Background Technology

[0002] Miniature TO (Transistor Outline) gold-plated devices refer to small semiconductor devices packaged in TO (Transistor Outline) packages. They are characterized by their tiny size and stable performance, and are commonly used in high-frequency or high-reliability electronic circuits. In the energy storage soldering process of miniature TO gold-plated devices, the soldering quality is crucial to the device's performance and reliability.

[0003] Currently, this process employs specific equipment and methods to achieve resistance welding of the cap and socket. Specifically, the cap is placed on the lower electrode (without chamfering), which is fixed to the lower base of the equipment. The socket is placed upside down on the cap, while the upper electrode is fixed to the upper base. Through the downward movement of a cylinder, the upper electrode makes close contact with the socket, and under a certain pressure, the energy storage welding equipment discharges instantaneously, achieving a sealed weld between the cap and socket.

[0004] However, the welding method in the existing technology has defects. Because the leads of the device socket are relatively long, they are prone to skew during the initial processing, resulting in serious misalignment between the leads and the inner hole of the upper electrode. During the descent of the upper electrode, this misalignment can easily cause the leads to be bent or even flattened, affecting the welding quality and the reliability of the device. Summary of the Invention

[0005] To address the shortcomings of the prior art, the technical problem to be solved by this invention is to provide a method for soldering micro TO devices, which solves the problem of pins being bent or flattened due to pin misalignment during the soldering process, improves soldering quality, reduces device scrap rate, and increases production efficiency.

[0006] To solve the above-mentioned technical problems, the present invention provides a method for welding a micro TO device, wherein a welding device is used to position and weld a tube base and a tube cap. The welding device includes an upper electrode, a lower electrode, and a limiting cylinder for fixing the upper electrode and the lower electrode at their limit positions. The lower electrode has a through hole for limiting the tube base, and the upper electrode has a through hole for limiting the tube cap. The first through hole and the second through hole are coaxially connected. The tube base includes a base body and a pin coaxially arranged with the base body. The inner diameter of the first through hole is larger than the outer diameter of the pin and smaller than the outer diameter of the base body. The tube cap has a body and a flange coaxially arranged with the body. The inner diameter of the second through hole is larger than the outer diameter of the body and smaller than the outer diameter of the flange. The method includes the following steps:

[0007] S100: Place the lower electrode inside the limiting cylinder;

[0008] S200: Insert the tube seat into the limiting cylinder with the pins facing down, so that the pins extend into the first through hole, and the seat body is limited to the upper end face of the lower electrode;

[0009] S300: The cap is placed on the seat with the flange facing down;

[0010] S400: The upper electrode is placed inside the limiting cylinder, and the seat is accommodated in the second through hole. The upper electrode and the lower electrode press the seat and the flange tightly together.

[0011] S500: The assembled pipe seat, pipe cap, and welding device are placed on the energy storage welding equipment for welding.

[0012] Furthermore, the limiting cylinder includes a cylinder wall and a limiting cavity formed within the cylinder wall, wherein the outer diameter of the upper electrode and the outer diameter of the lower electrode are both matched with the inner diameter of the limiting cavity to limit the position therein.

[0013] Furthermore, the limiting cavity extends through the limiting cylinder, and the limiting cavity includes a first cavity and a second cavity. The first cavity extends through the upper end face of the limiting cylinder, and the second cavity is located at the lower end of the first cavity and communicates with the first cavity. The inner diameter of the second cavity is smaller than the inner diameter of the first cavity and forms a first step surface between the second cavity and the first cavity. The lower electrode has a guide section that matches the first cavity and a limiting section that matches the second cavity. The outer diameter of the limiting section is smaller than the outer diameter of the guide section and forms a second step surface between the guide section and the guide section.

[0014] In step S100, when the lower electrode is placed inside the limiting cylinder, the first step surface contacts the second step surface to provide axial limiting for the lower electrode.

[0015] Furthermore, a circular arc angle with a natural transition is formed between the main body and the flange, and an arc chamfer adapted to the arc angle is provided at the intersection of the lower end face of the upper electrode and the second through hole.

[0016] In step S400, when the upper electrode presses the cap onto the tube seat, the rounded chamfer matches and fits the rounded corner.

[0017] Furthermore, the sum of the height of the upper electrode and the height of the lower electrode is greater than the height of the limiting cylinder;

[0018] In step S400, when the upper electrode and the lower electrode limit are located inside the limiting cylinder, the upper end of the upper electrode extends upward out of the first cavity, and the lower end of the limiting section extends downward out of the second cavity, so as to facilitate the connection of the upper electrode and the lower electrode with the energy storage welding equipment.

[0019] Furthermore, the upper end of the limiting cylinder is recessed with a groove that communicates with the first cavity, and the outer peripheral wall of the upper electrode is provided with a block that matches the groove, and the block can slide vertically within the groove.

[0020] In step S400, the upper electrode is placed inside the limiting cylinder with the card block aligned with the card slot to make the upper electrode more stable and prevent it from rotating.

[0021] Furthermore, the limiting cylinder is also provided with a limiting component, which is used to limit the card block to be located within the card slot;

[0022] In step S400, the limiting component cooperates with the card block and the card slot to axially limit the upper electrode.

[0023] Furthermore, the limiting component includes a limiting piece, and the side wall of the card slot is provided with a horizontal groove at a position corresponding to the upper end face of the card block, and the limiting piece slides horizontally in the groove;

[0024] In step S400, after the upper electrode is assembled into the limiting cylinder, the limiting piece is rotated to move from the groove into the slot to axially limit the card block.

[0025] Furthermore, the card slots and card blocks are in several groups, and the several groups of card slots and card blocks are evenly distributed in a circular shape with the axis of the limiting cavity as the center. The limiting piece also has several pieces that correspond one-to-one with the several groups of card slots and card blocks.

[0026] Furthermore, the limiting component also includes a rotating ring, with a plurality of limiting plates evenly spaced on the inner peripheral wall of the rotating ring, and an annular groove communicating with the plurality of grooves being opened at the position corresponding to the groove in the limiting cylinder, and the rotating ring being rotatably mounted in the annular groove.

[0027] In step S400, the rotating ring is rotated to simultaneously drive the plurality of limiting pieces to rotate, thereby axially limiting each of the locking blocks.

[0028] The micro TO device welding method of the present invention has at least the following beneficial effects: the micro TO device is assembled with the tube seat at the bottom and the tube cap at the top, so that the upper electrode and the lower electrode together press the assembled micro TO device together, and a limiting cylinder is set to limit and fix the upper electrode and the lower electrode so that the upper electrode, the lower electrode, the tube seat and the tube cap form a stable whole. This welding method can better protect the tube seat and the tube cap; at the same time, the upper electrode used to press the tube cap is also provided with a rounded chamfer that matches the rounded angle of the tube cap, further protecting the tube cap from damage during the welding process. Attached Figure Description

[0029] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0030] Figure 1 This is a schematic diagram of the structure of the TO device in Embodiment 1 of the micro TO device welding method of the present invention;

[0031] Figure 2 This is a schematic diagram of the structure of a first embodiment of the micro TO device welding method of the present invention;

[0032] Figure 3 This is a cross-sectional structural schematic diagram of an embodiment of the micro TO device welding method of the present invention;

[0033] Figure 4 This is a schematic diagram of the upper electrode structure in Embodiment 1 of the micro TO device welding method of the present invention;

[0034] Figure 5 This is a schematic diagram of the limiting cylinder in Embodiment 1 of the micro TO device welding method of the present invention;

[0035] Figure 6 This is a schematic diagram of the structure of Embodiment 2 of the micro TO device welding method of the present invention;

[0036] Figure 7 This is a schematic diagram of the upper electrode and the card block in Embodiment 2 of the micro TO device welding method of the present invention;

[0037] Figure 8 This is a schematic diagram of the limiting cylinder in Embodiment 2 of the micro TO device welding method of the present invention;

[0038] Figure 9 This is a cross-sectional schematic diagram of the limiting cylinder in Embodiment 2 of the micro TO device welding method of the present invention.

[0039] The meanings of the labels in the attached diagram are as follows:

[0040] Miniature TO device 1, cap 11, body 111, flange 112, rounded corner 113, socket 12, base 121, lead 122;

[0041] Welding device 2, upper electrode 21, second through hole 211, rounded chamfer 212, locking block 213, lower electrode 22, guide section 221, limiting section 222, second step surface 223, first through hole 224, limiting cylinder 23, first cavity 231, second cavity 232, first step surface 233, and slot 234;

[0042] Limiting component 3, limiting piece 31, rotating ring 32, ring groove 33, groove 34, connecting groove 35, lever 36, lever piece 37, rubber strip 38. Detailed Implementation

[0043] The invention will now be further described with reference to the accompanying drawings.

[0044] Example 1:

[0045] To more clearly illustrate the structure of the present invention, the miniature TO device 1 in this embodiment will be described first. Please refer to [link / reference]. Figure 1 The miniature TO device 1 in this embodiment includes a cap 11 and a base 12 coaxially assembled. The base 12 includes a body 121 and a pin 122 coaxially arranged with the body 121. Externally, the body 121 is composed of a first portion and a second portion coaxially arranged, with the outer diameter of the first portion being smaller than that of the second portion. The pin 122 is fixed to the side of the second portion away from the first portion, and is elongated with an outer diameter smaller than that of the first portion. The cap 11 includes a body 111 and a flange 112 coaxially arranged with the body 111. The body 111 is a hollow cylinder with one end capped by an arc-shaped glass lens. The flange 112 is located on the body 111 at the other end away from the glass lens and extends radially outward from the outer periphery of the body 111; therefore, the outer diameter of the flange 112 is larger than that of the body 111. A circular, naturally transitioning arc angle 113 is formed between the body 111 and the flange 112. The inner diameter of the body 111 matches the inner diameter of the first portion to accommodate the first portion. The outer diameter of the flange 112 matches the second portion to press against the second portion.

[0046] The micro TO device welding method of the present invention aims to perform positioning welding of the tube seat 12 and tube cap 11 of the micro TO device 1 using a welding device 2. Please refer to... Figure 2 and Figure 3The welding device 2 includes an upper electrode 21, a lower electrode 22, and a limiting cylinder 23 for limiting and fixing the upper electrode 21 and the lower electrode 22. To cooperate with the limiting cylinder 23, the lower electrode 22 includes a coaxial guide section 221 and a limiting section 222. The limiting section 222 is located at the lower end of the guide section 221, and its outer diameter is smaller than that of the guide section 221, forming a second stepped surface 223 between the two sections. The lower electrode 22 has a through hole 224 for limiting the tube seat 12. The inner diameter of the first through hole 224 is larger than the outer diameter of the pin 122 and smaller than the outer diameter of the second portion. Thus, the first through hole 224 can accommodate the pin 122 while holding the seat 121 on the upper surface of the lower electrode 22. It is important to emphasize that the inner diameter of the first through hole 224 can be as large as possible without being smaller than the outer diameter of the second portion. This is because during the processing of the tube seat 12, the central axis of the pin 122 may deviate from the central axis of the seat body 121 by a certain angle. This does not affect the subsequent use of the tube seat 12. When the first through hole 224 is as large as possible, the deviation between the pin 122 and the seat body 121 that the first through hole 224 can accommodate is also greater. That is, even if the deviation between the pin 122 and the seat body 121 is large, when the pin 122 is accommodated in the first through hole 224, the lower end face of the tube seat 12 can still fit against the upper end face of the lower electrode 22, without affecting the subsequent welding operation.

[0047] The upper electrode 21 has the same outer diameter as the guide section 221, and the upper electrode 21 has a through second through hole 211 for limiting the cap 11. The second through hole 211 and the first through hole 224 can be coaxially connected. The inner diameter of the second through hole 211 is larger than the outer diameter of the main body 111 and smaller than the outer diameter of the flange 112. Thus, the second through hole 211 can accommodate the main body 111, and the flange 112 can be pressed against the tube seat 12 and the lower electrode 22 through the lower end face of the upper electrode 21. It should be emphasized that the intersection of the lower end face of the upper electrode 21 and the second through hole 211 has a rounded chamfer 212 that matches the rounded angle 113. Please refer to [reference needed]. Figure 4 When the lower end face of the upper electrode 21 presses the flange 112 onto the tube seat 12 and the lower electrode 22, the rounded chamfer 212 presses onto the rounded corner 113, avoiding scratches to the tube seat 12 at the sharp intersection, and also avoiding the problem of excessive charge accumulation and excessive current at the sharp intersection causing the gold plating layer of the tube cap 11 to stick to the upper electrode 21 during the welding process.

[0048] The limiting cylinder 23 includes a cylinder wall and a limiting cavity formed within the cylinder wall. The limiting cavity is coaxial with the limiting cylinder 23 and extends through the limiting cylinder 23 axially. The limiting cavity includes a first cavity 231 and a second cavity 232 coaxially formed. The first cavity 231 extends through the upper end face of the limiting cylinder 23, and the inner diameter of the first cavity 231 matches the outer diameter of the upper electrode 21 and the guide section 221 to accommodate both the upper electrode 21 and the lower electrode 22. The second cavity 232 is located at the lower end of the first cavity 231 and communicates with the first cavity 231. The inner diameter of the second cavity 232 is smaller than the inner diameter of the first cavity 231 and forms a first stepped surface 233 between the second cavity 231 and the first cavity 231. (Please refer to...) Figure 5 The outer diameter of the limiting segment 222 matches the inner diameter of the second cavity 232. When the lower electrode 22 is placed inside the limiting cylinder 23, the first step surface 233 contacts the second step surface 223 to provide axial limiting for the lower electrode 22. The sum of the height of the upper electrode 21 and the height of the lower electrode 22 is greater than the height of the limiting cylinder 23.

[0049] The micro TO device welding method of the present invention, which uses the welding device 2 described above to perform positioning welding on the tube seat 12 and tube cap 11 of the micro TO device 1, includes the following steps:

[0050] S100: Place the lower electrode 22 inside the limiting cylinder 23;

[0051] S200: The tube seat 12 is inserted into the limiting cylinder 23 with the pin 122 facing down, so that the pin 122 extends into the first through hole 224, and the seat body 121 is limited to the upper end face of the lower electrode 22.

[0052] S300: The cap 11 is placed on the seat 121 with the flange 112 facing downwards;

[0053] S400: The upper electrode 21 is placed inside the limiting cylinder 23, and the seat 121 is accommodated in the second through hole 211. The upper electrode 21 and the lower electrode 22 press the seat 121 and the flange 112 tightly together.

[0054] S500: The assembled pipe seat 12, pipe cap 11 and welding device 2 are placed on the energy storage welding equipment for welding.

[0055] The operation of Embodiment 1 of the micro TO device welding method of the present invention is as follows: First, the lower electrode 22 is placed inside the limiting cylinder 23. During placement, the lower electrode 22 is inserted into the limiting cavity with the limiting section 222 facing downwards until the first step surface 233 contacts the second step surface 223. At this time, the lower end of the lower electrode 22 extends out of the limiting cylinder 23. Then, the tube seat 12 is inserted into the limiting cylinder 23 with the pin 122 facing downwards, so that the pin 122 extends into the first through hole 224, and the lower end surface of the seat body 121 is attached to the upper end surface of the lower electrode 22, thereby limiting the seat body 121 to the upper end surface of the lower electrode 22. It should be emphasized that the seat body 121 needs to be coaxial with the first through hole 224 during placement to avoid affecting subsequent pressing and welding. Then, the tube cap 11 is covered on the seat body 121 with the flange 112 facing downwards. The upper electrode 21 is placed inside the limiting cylinder 23, and the seat 121 is accommodated within the second through hole 211. The upper electrode 21 and the lower electrode 22 press the seat 121 and the flange 112 tightly together. Finally, the assembled tube seat 12, tube cap 11, and welding device 2 are placed on the energy storage welding equipment for welding.

[0056] Based on the above embodiments, the micro TO device welding method of the present invention has the following beneficial effects: the micro TO device 1 is assembled with the tube seat 12 at the bottom and the tube cap 11 at the top, so that the upper electrode 21 and the lower electrode 22 together press the assembled micro TO device 1 together. A limiting cylinder 23 is set to limit and fix the upper electrode 21 and the lower electrode 22 so that the upper electrode 21, the lower electrode 22, the tube seat 12 and the tube cap 11 form a stable whole. This welding method can better protect the tube seat 12 and the tube cap 11. At the same time, the upper electrode 21 used to press the tube cap 11 is also provided with an arc chamfer 212 that matches the arc angle 113 of the tube cap 11, further protecting the tube cap 11 from damage during the welding process.

[0057] Example 2:

[0058] This embodiment, based on Embodiment 1 described above, adds axial limiting of the upper electrode 21. Please refer to... Figure 6 and Figure 7The upper end of the limiting cylinder 23 is recessed with a groove 234. There are several grooves 234, arranged evenly spaced in a circular pattern around the axis of the limiting cylinder 23. Each groove 234 is an arc shape matching the limiting cylinder 23, and each groove 234 penetrates the inner wall of the limiting cylinder 23 to communicate with the first cavity 231. The outer peripheral wall of the upper electrode 21 has a protruding block 213 corresponding to each of the grooves 234. The block 213 can slide vertically within the groove. When the block 213 slides to the bottom of the groove, the upper electrode 21 and the lower electrode 22 tightly press the tube seat 12 and the tube cap 11 together. With the cooperation of several of the aforementioned locking blocks 213 and several of the aforementioned locking slots 234, the upper electrode 21 will not rotate in the limiting cylinder 23, thereby preventing frictional damage to the cap 11.

[0059] Please refer to Figure 6 , Figure 8 and Figure 9 The limiting cylinder 23 is further provided with a limiting component 3, which is used to cooperate with a plurality of the locking blocks 213 and a plurality of the locking slots 234 to achieve axial limiting of the upper electrode 21. The limiting component 3 includes a limiting piece 31 and a rotating ring 32. The limiting cylinder 23 has an annular groove 33, which is located inside the limiting cylinder 23 at a position corresponding to the outer periphery of the plurality of locking slots 234, and the annular groove 33 communicates with all the locking slots 234, specifically, through the outer periphery of the locking slots 234. The rotating ring 32 matches the annular groove 33 to be accommodated therein, and the rotating ring 32 can rotate around its own axis within the annular groove 33. Each locking slot 234 also has a groove 34 on one circumferential side, which communicates with the corresponding locking slot 234, and the outer periphery of the groove 34 communicates with the annular groove 33. The grooves 34 are all arc-shaped to match the locking slot 234. The limiting piece 31 has several pieces corresponding one-to-one with the several grooves 34. Each limiting piece 31 is arc-shaped and matches the groove 34. Each limiting piece 31 is fixed to the inner peripheral wall of the rotating ring 32. When the rotating ring 32 is installed in the annular groove 33, the several limiting pieces 31 are located one-to-one in the several grooves 34. When the rotating ring 32 rotates, the several limiting pieces 31 move together from the grooves 34 to the corresponding slots 234. It should be emphasized that the grooves 34 are opened on the side wall of the slots 234 at the position corresponding to the upper end face of the block 213. That is, when the limiting piece 31 moves into the slot 234, the lower end face of the limiting piece 31 contacts the upper end face of the block 213 to limit its movement.

[0060] A connecting groove 35 is also provided on the limiting cylinder 23 at a position corresponding to the outer periphery of the annular groove 33. The connecting groove 35 is radially formed and extends circumferentially along the limiting cylinder 23. One radial end of the connecting groove 35 communicates with the annular groove 33, and the other radial end of the connecting groove 35 extends outward through the outer peripheral wall of the limiting cylinder 23. A lever 36 is slidably disposed within the connecting groove 35. The lever 36 is arranged radially along the limiting cylinder 23, with one end fixed to the outer peripheral wall of the rotating ring 32 and the other end extending outward. The lever 36 can rotate within the connecting groove 35 about the axis of the limiting cylinder 23 (sliding along this trajectory within the connecting groove 35). A paddle 37 is provided at the end of the lever 36 away from the rotating ring 32. The paddle 37 has an arc shape that matches the outer diameter of the limiting cylinder 23, which makes the overall device more aesthetically pleasing and compact, and reduces the risk of damage caused by protruding components. It should be emphasized that both the lever 36 and the paddle 37 are damped slidingly connected to the connecting groove 35. Several vertical rubber strips 38 are provided on the side of the paddle 37 that protrudes from the limiting cylinder 23 to increase the friction on the surface of the paddle 37, making it easier for the user to move the paddle 37.

[0061] The operation of Embodiment 2 of the micro TO device welding method of the present invention is as follows: In step S400, when the upper electrode 21 is placed in the limiting cylinder 23, the plurality of locking blocks 213 are aligned one-to-one with the plurality of locking slots 234. When the upper electrode 21 is placed, the plurality of locking blocks 213 also slide into the plurality of locking slots 234. Then, the limiting component 3 is operated to further fix the upper electrode 21. The steps are as follows: the lever 37 is moved so that the lever 37 drives the rotating ring 32 to rotate through the lever 36. As a result, the rotating ring 32 drives the plurality of limiting pieces 31 to rotate. When the limiting piece 31 moves from the groove 34 into the locking slot 234, the locking block 213 is limited in the locking slot 234, thereby limiting the upper electrode 21.

[0062] Based on the above embodiments, the micro TO device welding method of the present invention has the following beneficial effects: the slot, the block, and the limiting component can cooperate with each other to limit the upper electrode in the circumferential and axial directions. The circumferential limiting can prevent the upper electrode from rotating and causing frictional damage to the tube shell or even the tube seat. The axial limiting makes the device more stable when assembled, which is not only easy to move, but also easy to store.

Claims

1. A method for welding miniature TO devices, comprising positioning and welding a tube seat and a tube cap using a welding device, characterized in that: The welding apparatus includes an upper electrode, a lower electrode, and a limiting cylinder for fixing the upper electrode and the lower electrode to their limit positions. The lower electrode has a through hole for limiting the tube seat, and the upper electrode has a through hole for limiting the tube cap. The first through hole and the second through hole are coaxially connected. The tube seat includes a seat body and a pin coaxially arranged with the seat body. The inner diameter of the first through hole is larger than the outer diameter of the pin and smaller than the outer diameter of the seat body. The tube cap has a body and a flange coaxially arranged with the body. The inner diameter of the second through hole is larger than the outer diameter of the body and smaller than the outer diameter of the flange. The method includes the following steps: S100: Place the lower electrode inside the limiting cylinder; S200: Insert the tube seat into the limiting cylinder with the pins facing down, so that the pins extend into the first through hole, and the seat body is limited to the upper end face of the lower electrode; S300: The cap is placed on the seat with the flange facing down; S400: The upper electrode is placed inside the limiting cylinder, and the seat is accommodated in the second through hole. The upper electrode and the lower electrode press the seat and the flange tightly together. S500: The assembled pipe seat, pipe cap, and welding device are placed on the energy storage welding equipment for welding.

2. The micro TO device welding method as described in claim 1, characterized in that: The limiting cylinder includes a cylinder wall and a limiting cavity formed within the cylinder wall. The outer diameter of the upper electrode and the outer diameter of the lower electrode are both matched with the inner diameter of the limiting cavity to limit the position therein.

3. The micro TO device welding method as described in claim 2, characterized in that: The limiting cavity extends through the limiting cylinder. The limiting cavity includes a first cavity and a second cavity. The first cavity extends through the upper end face of the limiting cylinder. The second cavity is located at the lower end of the first cavity and communicates with the first cavity. The inner diameter of the second cavity is smaller than the inner diameter of the first cavity and forms a first step surface with the first cavity. The lower electrode has a guide section that matches the first cavity and a limiting section that matches the second cavity. The outer diameter of the limiting section is smaller than the outer diameter of the guide section and forms a second step surface with the guide section. In step S100, when the lower electrode is placed inside the limiting cylinder, the first step surface contacts the second step surface to provide axial limiting for the lower electrode.

4. The micro TO device welding method as described in claim 1, characterized in that: A circular arc angle with a natural transition is formed between the main body and the flange, and a circular chamfer that matches the arc angle is provided at the intersection of the lower end face of the upper electrode and the second through hole. In step S400, when the upper electrode presses the cap onto the tube seat, the rounded chamfer matches and fits the rounded corner.

5. The micro TO device welding method as described in claim 3, characterized in that: The sum of the height of the upper electrode and the height of the lower electrode is greater than the height of the limiting cylinder; In step S400, when the upper electrode and the lower electrode limit are located inside the limiting cylinder, the upper end of the upper electrode extends upward out of the first cavity, and the lower end of the limiting section extends downward out of the second cavity, so as to facilitate the connection of the upper electrode and the lower electrode with the energy storage welding equipment.

6. The micro TO device welding method as described in claim 3, characterized in that: The upper end of the limiting cylinder is recessed with a groove that communicates with the first cavity. The outer peripheral wall of the upper electrode is provided with a block that matches the groove. The block can slide vertically within the groove. In step S400, the upper electrode is placed inside the limiting cylinder with the card block aligned with the card slot to make the upper electrode more stable and prevent it from rotating.

7. The micro TO device welding method as described in claim 6, characterized in that: The limiting cylinder is also provided with a limiting component, which is used to limit the card block to be located in the card slot; In step S400, the limiting component cooperates with the card block and the card slot to axially limit the upper electrode.

8. The micro TO device welding method as described in claim 7, characterized in that: The limiting component includes a limiting piece, and the side wall of the slot has a horizontal groove at a position corresponding to the upper end face of the card block, and the limiting piece slides horizontally in the groove; In step S400, after the upper electrode is assembled into the limiting cylinder, the limiting piece is rotated to move from the groove into the slot to axially limit the card block.

9. The micro TO device welding method as described in claim 8, characterized in that: The slots and blocks are in several groups, and the slots and blocks are evenly spaced in a circle with the axis of the limiting cavity as the center. The limiting piece also has several pieces that correspond one-to-one with the slots and blocks.

10. The micro TO device welding method as described in claim 9, characterized in that: The limiting component also includes a rotating ring, and a plurality of the limiting pieces are evenly spaced on the inner peripheral wall of the rotating ring. The limiting cylinder has an annular groove at the position corresponding to the groove, which communicates with the plurality of grooves. The rotating ring is rotatably mounted in the annular groove. In step S400, the rotating ring is rotated to simultaneously drive the plurality of limiting pieces to rotate, thereby axially limiting each of the locking blocks.

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