Button-type airbag electrode plug and method of processing the same

Abstract

This invention discloses a button-type airbag electrode plug and its processing method, comprising: fabricating a base plate and a cover plate; the base plate having a substrate A, circuit patterns A and B respectively disposed on the front and back sides of the substrate A, a through hole penetrating the substrate A and connecting circuit patterns A and B, and a connecting blind hole opening on the back side of the substrate A and communicating with circuit pattern B; the cover plate having a substrate B and a through hole; fixing a bridge wire to circuit pattern A; fixing the cover plate to the front side of the base plate, the front side of the base plate and the through hole forming a receiving cavity, the bridge wire being received in the receiving cavity; printing and filling the receiving cavity with energetic material, and vacuum sealing the receiving cavity with a protective film; inserting an electrode needle into the connecting blind hole and communicating with circuit pattern B; and after reinforcement and injection molding protection treatment, obtaining the button-type airbag electrode plug. This processing method is simple, efficient, stable, and safe, and the resulting electrode plug has good quality, high ignition quality, and low production cost.

Description

Technical Field

[0001] This invention relates to the field of electrode plug technology, and in particular to a button-type airbag electrode plug and its processing method. Background Technology

[0002] As an important component of a car's passive safety system, airbags can be activated by electrical signals when a collision occurs, protecting the safety of passengers during the collision.

[0003] In automotive airbag systems, the gas generator is a crucial component. Its function is to produce the appropriate amount of gas at a specified speed and flow rate to inflate the airbag. Furthermore, within the gas generator's internal design, the ignition device is its sole initial ignition element, directly affecting key technical parameters such as airbag inflation time and inflation pressure.

[0004] Given market demand, ignition products are currently trending towards lighter weight and smaller size. For example, taking circular electrode plugs as an example, their diameter needs to be controlled within 2-20mm, and the machining accuracy within ±0.1mm. This makes the manufacturing of electrode plugs quite difficult, especially in controlling the yield of the bridge wire structure, the amount of energetic material used, and the bonding between the energetic material and the bridge wire. Consequently, the ignition quality of electrode plug products is generally not high and cannot adequately meet market demands.

[0005] In view of this, the present invention is hereby proposed. Summary of the Invention

[0006] To overcome the above-mentioned defects, the present invention provides a button-type airbag electrode plug and its processing method. The processing method is simple and reasonable, with high operating efficiency, good stability and high safety. Moreover, the resulting electrode plug has good quality, high ignition quality and low production cost.

[0007] The technical solution adopted by this invention to solve its technical problem is: a processing method for a button-type airbag electrode plug, comprising the following steps: S1: Fabrication of electrode plug substrate; The substrate A is sequentially drilled, plated with copper, and fabricated with circuit patterns to obtain a base plate. The base plate is provided with circuit pattern A formed on the front side of the substrate A, circuit pattern B formed on the back side of the substrate A, a through hole that penetrates both the front and back sides of the substrate A and connects circuit pattern A and circuit pattern B, and a blind hole that opens on the back side of the substrate A and is electrically connected to circuit pattern B. The bridge wire is welded and fixed onto the circuit pattern A; Drilling is performed on substrate B to obtain a cover plate with through holes; The cover plate is fixed to the front side of the base plate by a vacuum hot pressing process to obtain the electrode plug substrate; wherein, the front side of the base plate and the through hole form a receiving cavity, and the bridge wire is received in the receiving cavity; S2: After filling the cavity with energetic material using a segmented screen printing process, the cavity is vacuum-sealed with a protective film. S3: Insert the electrode needle into the connection blind hole and weld it in place, so that the electrode needle is electrically connected to the circuit pattern B, and obtain the electrode plug semi-finished product; S4: After strengthening and injection molding protection treatment of the obtained electrode plug semi-finished product, the button-type airbag electrode plug is obtained.

[0008] As a further improvement of the present invention, in S2 above, the screen printing process includes a first printing stage, a pressing stage, and a second printing stage performed sequentially. The processing parameters for the first printing stage are: the screen is made of steel or copper mesh, and the screen tension is 10–20 N; the squeegee pressure is 0.1–1 kg / cm². 2 The speed is 0.2–0.5 m / min, and the angle is 60°–90°; the temperature in the processing environment is 16–24°C, and the humidity is 60%–90%. The processing parameters for the pressing stage are: pressing temperature of 150℃~180℃, and pressing pressure of 20~100Kgf / cm. 2 The compression time is 60–120 minutes; The processing parameters for the second printing stage are as follows: the screen is made of steel or copper mesh, and the screen tension is 10–20 N; the squeegee pressure is 1–3 kg / cm². 2 The speed is 0.1 to 0.3 m / min, and the angle is 60° to 90°; the temperature in the processing environment is 16 to 24°C, and the humidity is 60% to 90%.

[0009] As a further improvement of the present invention, in S2 above, the protective film is an epoxy resin film, which is applied to the opening of the receiving cavity using a vacuum laminating machine. The processing parameters of the vacuum laminating machine are: lamination temperature of 65℃~75℃, vacuum arrival time of less than 20s, and film pressing pressure of 5~7Kgf / cm. 2 ; In addition, after the film is applied, the protective film is pressed at a temperature of 150℃~180℃ and a pressing pressure of 20~100Kgf / cm. 2 The compression process lasts 60–120 minutes.

[0010] As a further improvement of the present invention, in S1 above, the substrate A and the substrate B are each independently made of ceramic plate or FR4 plate or a composite plate of both. Both the through hole and the connecting blind hole are metallized holes, and the through hole is an insulating hole.

[0011] As a further improvement of the present invention, in S1 above, a composite functional layer is plated at the junction of the bridge wire and the circuit pattern A, and the composite functional layer is composed of at least two of the following layers: copper layer, nickel layer and tin layer.

[0012] As a further improvement of the present invention, in S1 above, the processing parameters of the vacuum hot pressing process are: vacuum degree less than -0.1MPa, hot pressing temperature of 150℃~180℃, and hot pressing pressure not less than 20Kgf / cm². 2 .

[0013] As a further improvement of the present invention, in the electrode plug substrate, the outer peripheral edge of the cover plate is aligned and connected with the outer peripheral edge of the base plate.

[0014] As a further improvement of the present invention, a nickel plating layer and a gold plating layer are sequentially plated on the surface of the electrode needle, wherein the thickness of the nickel plating layer is not less than 3 μm and the thickness of the gold plating layer is not less than 3 microinches.

[0015] As a further improvement of the present invention, in S4 above, the method for strengthening the obtained electrode plug semi-finished product is: a reinforcing cap is tightly fitted onto the electrode plug substrate of the obtained electrode plug semi-finished product. The method for injection molding protection of the obtained electrode plug semi-finished product is as follows: an insulating protective shell is tightly fitted over the reinforcing cap and the electrode needle by injection molding process; in addition, one end of the electrode needle extends out of the insulating protective shell.

[0016] The present invention also provides a button-type airbag electrode plug, which is manufactured using the processing method of the button-type airbag electrode plug described in the present invention.

[0017] The beneficial effects of this invention are as follows: Unlike existing technologies, the processing method of the button-type airbag electrode plug provided by this invention has the following advantages: ① In the manufacturing of the electrode plug substrate, this invention adopts the following steps: first, the base plate and the cover plate are manufactured separately; then, the bridge wire is welded and fixed to the circuit pattern A on the base plate; and finally, the cover plate is hot-pressed and fixed to the front of the base plate to obtain the electrode plug substrate. It is understood that the above-mentioned method for manufacturing the electrode plug substrate ensures that the position of the bridge wire is fixed and not easily deformed, thereby significantly reducing the defect rate of the bridge wire and improving the ignition quality of the electrode plug. Furthermore, before assembling the cover plate and the base plate, the welding quality between the bridge wire and the circuit pattern A can be inspected and / or optimized, further ensuring the quality of the bridge wire and improving the ignition quality of the electrode plug. ② This invention employs a segmented screen printing process for filling energetic materials, which achieves the following: a) Segmented printing reduces the single printing area and the squeegee travel distance, thereby effectively shortening the single printing time and improving printing efficiency; b) By setting a pressing operation between two printing stages and specifically controlling the processing parameters in each printing stage, not only can the energetic material be filled evenly, but the risk of air bubble entrapment can also be reduced, thus significantly improving the filling density and compactness of the energetic material. This ensures high consistency in the amount of energetic material used and ensures that the energetic material is tightly wrapped / covered with the bridge wire and the circuit pattern A, further improving the ignition quality of the electrode plug; c) Segmented printing reduces the contact area and contact time between the equipment components and the energetic material in a single printing operation, thereby significantly reducing the risks caused by friction, static electricity, or temperature fluctuations, ensuring safe and stable printing operations. ③ Before injection molding the obtained electrode plug semi-finished product, the present invention also tightly fits a reinforcing cap on the electrode plug substrate to enhance its overall strength. ④ The electrode plug processing method provided by the present invention is simple, reasonable, easy to process and manufacture, and has low manufacturing cost. Attached Figure Description

[0018] Figure 1 This is a flowchart of the processing method for the button-type airbag electrode plug described in this invention; Figure 2 This is a top view of the base plate described in this invention. Figure 3 This is a bottom view of the base plate described in this invention. Figure 4 This is a schematic diagram of the assembly structure in which the bridge wire is welded and fixed to the circuit pattern A in this invention; Figure 5 This is a three-dimensional structural diagram of the cover plate described in this invention; Figure 6 This is a three-dimensional structural diagram of the electrode plug substrate described in this invention; Figure 7 This is a schematic diagram of the assembly structure after the receiving cavity of the electrode plug substrate is filled with energetic material in this invention; Figure 8 This is a schematic diagram of the assembly structure after the receiving cavity is vacuum-sealed with a protective film in this invention; Figure 9 This is a schematic diagram of the structure of the electrode plug semi-finished product described in this invention; Figure 10 This is a schematic diagram of the assembly structure in which the reinforcing cap is tightly fitted onto the electrode plug substrate of the electrode plug semi-finished product in this invention. Figure 11 This is a schematic diagram of the button-type airbag electrode plug described in this invention.

[0019] Referring to the accompanying drawings, the following explanations are provided: 1. Base plate; 10. Substrate A; 11. Circuit pattern A; 12. Circuit pattern B; 13. Through hole; 14. Connecting blind hole; 2. Bridge wire; 3. Cover plate; 30. Substrate B; 31. Through hole; 4. Energetic material; 5. Protective film; 6. Electrode needle; 7. Reinforcing cap; 8. Insulating protective shell; B1. Electrode plug base; C. Receiving cavity; B2. Button-type airbag electrode plug. Detailed Implementation

[0020] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0021] Example 1:

[0022] Please see the appendix Figure 1 To be continued Figure 11 As shown, this embodiment 1 provides a method for processing a button-type airbag electrode plug, including the following steps: S1: Fabrication of electrode plug substrate.

[0023] Specifically, the preferred method for fabricating the electrode plug substrate in this embodiment is as follows: S11: Provide a substrate A10. Depending on product design requirements, the substrate A10 can selectively be a ceramic plate, an FR4 plate, or a composite of both, with a ceramic plate or an FR4 plate being preferred. The aforementioned composite plate refers to a combination of a ceramic plate and an FR4 plate through lamination, an embedding composite process to embed ceramic sheets into an FR4 plate, or other composite methods. This embodiment does not impose restrictions on the thickness and dimensions of the substrate A10; these are determined based on product processing requirements. For example, the dimensions of the substrate A10 can be designed to be 120cm × 120cm to allow for the simultaneous processing of multiple base plates 1 (see below) on the substrate A10.

[0024] Then, the substrate A10 is sequentially processed by drilling, copper plating, and circuit pattern fabrication to obtain the base plate 1.

[0025] The aforementioned "drilling, copper plating, and circuit pattern fabrication" can employ techniques commonly used in the circuit board manufacturing field, and therefore will not be detailed here, but will only be briefly described as follows: ① Drilling: A CO2 laser is used to drill holes in the substrate A10, resulting in through holes penetrating both the front and back sides of the substrate A10, and blind holes opening onto the back side of the substrate A10. Understandably, after drilling, processes such as plasma cleaning can be used to remove slag / clean the inner walls of the through holes and blind holes to ensure the quality of subsequent copper plating.

[0026] ② Copper Plating: First, a seed layer is deposited on the entire surface of the substrate A10 and on the inner walls of the through holes and blind holes using a chemical copper plating process. Then, a copper plating layer of a set thickness is plated on the seed layer using an electroplating process, resulting in: a bottom copper layer formed on both the front and back surfaces of the substrate A10, consisting of the copper plating layer and the seed layer; a via 13 formed by the through holes and the seed layer and copper plating layer on their inner walls; and a connecting blind hole 14 formed by the blind holes and the seed layer and copper plating layer on their inner walls. It is understood that both the via 13 and the connecting blind hole 14 are metallized holes.

[0027] In addition, for the convenience of describing the subsequent processes, this embodiment will also define the board obtained after the above-mentioned copper plating process as an intermediate board.

[0028] ③ Circuit pattern fabrication: The obtained intermediate board is subjected to the following processes in sequence: pre-coating treatment (i.e., roughening, cleaning and drying of the obtained intermediate board), coating with photosensitive resist (i.e., coating the photosensitive resist dry film onto the two base copper layers using a vacuum laminator), exposure (i.e., exposing a portion of the photosensitive resist dry film according to the work instructions and using an LDI exposure machine), development (i.e., removing the unexposed areas of the photosensitive resist dry film using a developing solution), etching (i.e., etching away the portions of the two base copper layers that are exposed outside the photosensitive resist dry film using an alkaline etching solution), and stripping (i.e., removing the photosensitive resist dry film using a stripping solution). After these processes, the following circuit patterns are obtained: circuit pattern A11 formed on the front side of the substrate A10 and circuit pattern B12 formed on the back side of the substrate A10. Circuit pattern A11 is electrically connected to circuit pattern B12 through the via 13, and circuit pattern B12 is electrically connected to the connecting blind via 14.

[0029] As can be seen from the above, the implementation structure of the base plate 1 obtained in this embodiment is as follows: Please refer to the attached document. Figure 2 and attached Figure 3As shown, the substrate A10 is provided, a circuit pattern A11 is formed on the front side of the substrate A10, a circuit pattern B12 is formed on the back side of the substrate A10, a through hole 13 is formed through both the front and back sides of the substrate A10 and connects the circuit pattern A11 and the circuit pattern B12, and a blind hole 14 is opened on the back side of the substrate A10 and electrically connected to the circuit pattern B12.

[0030] For further details, please refer to the appendix. Figure 2 and attached Figure 3 As shown, in this embodiment, two of each of the circuit pattern A11, circuit pattern B12, and connecting blind via 14 are configured, and four of each of the through holes 13 are configured. That is, two connecting blind vias 14 are electrically connected to two circuit patterns B12, and each circuit pattern B12 is electrically connected to one circuit pattern A11 through two through holes 13. Of course, in practical applications, the number and shape of the circuit patterns A11 / B12, the connecting blind vias 14, and the through holes 13 are not limited to the above situation and can be determined according to product design requirements.

[0031] Additional notes: ① When multiple base plates 1 are fabricated at once on a large substrate A (e.g., its length and width are designed to be 120cm × 120cm), the "substrate A" in each base plate 1 is essentially a portion of the large substrate A. ② After the base plate 1 is fabricated, AOI optical inspection is required on the circuit pattern A11 / circuit pattern B12 to ensure the processing quality of the circuit pattern.

[0032] S12: The bridge wire 2 is welded and fixed onto the circuit pattern A11 using a chip bonding device or an energy storage spot welding device. The bridge wire 2 is preferably made of nickel-chromium alloy or tungsten alloy. The chip bonding device is a core conventional device in the semiconductor processing field, and the energy storage spot welding device is a conventional device in the metal welding field; therefore, the structure and processing methods of these two devices will not be described in detail here.

[0033] Furthermore, in conjunction with the base plate 1 structure obtained in S11 above, in this embodiment, the bridge wire 2 is fixedly connected between the two circuit patterns A11 (see attached diagram). Figure 4 As shown), a heating circuit is formed. Specifically, when the heating circuit is connected to an external power source, the current flow is as follows: one of the connection blind holes 14 → one of the circuit patterns B12 → one of the circuit patterns A11 → the bridge wire 2 → another of the circuit patterns A11 → another of the circuit patterns B12 → another of the connection blind holes 14.

[0034] Furthermore, in this embodiment, a composite functional layer is plated at the junction of the bridge wire 2 and the circuit pattern A11. This composite functional layer is composed of at least two of the following: a copper layer, a nickel layer, and a tin layer, stacked together. For example, the composite functional layer consists of a nickel layer, a tin layer, and a copper layer stacked sequentially from the inside out. Understandably, plating the nickel and tin layers first effectively improves the bonding stability between the subsequent copper layer and the bridge wire 2 and the circuit pattern A11, and also enhances the mechanical strength of the subsequent copper layer. Plating the copper layer then effectively improves the conductivity between the bridge wire 2 and the circuit pattern A11 during high-temperature operation, ensuring the reliability and accuracy of the bridge wire 2 at high temperatures.

[0035] S13: Provide substrate B30. Depending on product design requirements, substrate B30 may selectively be a ceramic plate, an FR4 plate, or a composite of both, with a ceramic plate or an FR4 plate being preferred. Furthermore, this embodiment does not impose restrictions on the thickness and dimensions of substrate B30; these are determined based on product processing requirements. For example, the thickness of substrate B30 needs to be determined based on the subsequent filling amount of energetic material 4; the dimensions of substrate B30 can be designed to be 120cm × 120cm to allow for the simultaneous processing of multiple cover plates 3 (see below) on substrate B30.

[0036] Then, the substrate B30 is drilled to obtain a cover plate 3 with a through hole 31. It is understood that the cover plate 3 is implemented as follows: Please refer to the attached document. Figure 5 As shown, a substrate B30 is provided, and through holes 31 penetrating both the front and back surfaces of the substrate B30 are provided, and the through holes 31 are insulating holes. In addition, the diameter of the through holes 31 needs to be determined based on the amount of energetic material 4 subsequently filled.

[0037] Furthermore, in this embodiment, a CO2 laser is also used to drill the substrate B30. After drilling is completed, plasma cleaning and other processes can be used to remove slag / clean the inner wall of the through hole 31 to ensure the processing quality of the subsequent filling of energetic material 4.

[0038] Additional explanation: When multiple cover plates 3 are processed at one time on a large substrate B (such as one with dimensions of 120cm×120cm), the “substrate B” in each cover plate 3 is actually a part of the large substrate B.

[0039] S14: The cover plate 3 is fixed to the front side of the base plate 1 by vacuum hot pressing to obtain the electrode plug substrate B1. See the appendix for details. Figure 6 As shown.

[0040] Furthermore, in the obtained electrode plug substrate B1, the outer peripheral edge of the cover plate 3 is aligned and connected with the outer peripheral edge of the base plate 1, and the front surface of the base plate 1 and the through hole 31 form a receiving cavity C, in which the bridge wire 2 and the circuit pattern A11 are both received.

[0041] Furthermore, in this embodiment, the preferred processing parameters for the vacuum hot pressing process are: vacuum degree less than -0.1 MPa, hot pressing temperature of 150℃~180℃, and hot pressing pressure not less than 20 kgf / cm². 2 .

[0042] Additional explanation: After the large-format substrate B and the large-format substrate A are hot-pressed and fixed, the multiple cover plates 3 and the multiple base plates 1 are connected one-to-one to form multiple electrode plug substrates B1.

[0043] Understandably, in this embodiment, the electrode plug substrate is manufactured by first independently fabricating the base plate 1 and the cover plate 3, then welding and fixing the bridge wire 2 to the circuit pattern A11 on the base plate 1, and finally hot-pressing and fixing the cover plate 3 to the front side of the base plate 1 to obtain the electrode plug substrate. This manufacturing method ensures that the position of the bridge wire 2 is fixed and not easily deformed, thereby significantly reducing the defect rate of the bridge wire and improving the ignition quality of the electrode plug. In addition, before assembling the cover plate 3 with the base plate 1, the welding quality between the bridge wire 2 and the circuit pattern A11 can be inspected and / or optimized, further ensuring the quality of the bridge wire and improving the ignition quality of the electrode plug.

[0044] S2: After filling the receiving cavity C with energetic material 4 using a segmented screen printing process (see attached document), Figure 7 As shown), the receiving cavity C is vacuum sealed with protective film 5 (see attached document). Figure 8 (As shown).

[0045] Furthermore, the segmented screen printing process used in this embodiment includes a first printing stage, a pressing stage, and a second printing stage performed sequentially. The processing parameters for the first printing stage are: the screen is made of steel or copper mesh, and the screen tension is 10–20 N; the squeegee pressure is 0.1–1 kg / cm². 2 (e.g., 0.8 kg / cm) 2 The speed is 0.2–0.5 m / min (e.g., 0.5 m / min), and the angle is 60°–90°; the temperature in the processing environment is 16–24°C, and the humidity is 60%–90%; the processing parameters for the pressing stage are: pressing temperature 150°C–180°C (e.g., 180°C), and pressing pressure 20–100 kgf / cm³. 2 (e.g., 80 kgf / cm) 2The pressing time is 60–120 min (e.g., 100 min); the processing parameters for the second printing stage are: the screen uses a steel or copper screen, and the screen tension is 10–20 N; the squeegee pressure is 1–3 kg / cm². 2 (e.g., 1.5kg / cm) 2 The speed is 0.1 to 0.3 m / min (e.g., 0.2 m / min), and the angle is 60° to 90°; the temperature in the processing environment is 16 to 24°C, and the humidity is 60% to 90%.

[0046] Understandably, this embodiment, by employing a segmented screen printing process and optimizing the specific processing parameters of each stage as described above, achieves the following: ① Segmented printing reduces the single printing area and the squeegee travel distance, thereby effectively shortening the single printing time and improving printing efficiency; ② A pressing operation is set between the two printing operations, and the processing parameters in each printing stage are specifically optimized, which not only ensures uniform filling of energetic materials but also reduces the risk of air bubble entrapment, thereby significantly improving the filling density and compactness of energetic materials. This ensures high consistency in the amount of energetic materials used and ensures that the energetic material 4 is tightly wrapped / covered by the bridge wire 2 and the circuit pattern A11, further improving the ignition quality of the electrode plug; ③ Segmented printing reduces the contact area and contact time between equipment components and energetic materials in a single printing operation, thereby significantly reducing the risks caused by friction, static electricity, or temperature fluctuations of energetic materials, ensuring safe and stable printing operations.

[0047] In addition, this embodiment does not impose any restrictions on the specific material of the energetic material 4, and it is determined according to the product design requirements.

[0048] Furthermore, in this embodiment, the protective film 5 can be, but is not limited to, an epoxy resin film. The protective film 5 is applied to the opening of the receiving cavity C using a vacuum laminating machine. The preferred processing parameters of the vacuum laminating machine are: lamination temperature of 65℃~75℃, vacuum arrival time of less than 20s, and film pressing pressure of 5~7Kgf / cm². 2 .

[0049] In addition, after the film is applied, the protective film 5 is pressed at a temperature of 150℃~180℃ (e.g., 150℃) and a pressing pressure of 20~100Kgf / cm. 2 (e.g., 50 kgf / cm) 2 The protective film 5 is pressed for 60 to 120 minutes (e.g., 60 minutes) to ensure that the protective film 5 is firmly bonded to the cavity, while also further enhancing the tight wrapping / covering of the energetic material 4 with the bridge wire 2 and the circuit pattern A11.

[0050] Supplementary note: After thermally pressing and fixing the large plate-shaped substrate B and the large plate-shaped substrate A to form multiple electrode plug bases B1, in this embodiment, the above-mentioned segmented screen printing process is also used to simultaneously fill the energy-containing material 4 in the receiving cavities C of the multiple electrode plug bases B1, and the vacuum film laminating process is used to simultaneously perform vacuum sealing on the receiving cavities C of the multiple electrode plug bases B1. For the convenience of the following description, in this embodiment, the component composed of the electrode plug base B1, the energy-containing material 4 and the protective film 5 is defined as an intermediate product. It can be understood that multiple intermediate products are formed at that time. In addition, for the electrode pin assembly operation in the subsequent process, before performing the following S3 operation, this embodiment also uses a CNC device to perform a cutting and forming operation to cut the multiple integrated intermediate products into independent single-piece intermediate products.

[0051] S3: Combining the intermediate products obtained in the above S2, this embodiment also provides a pair of electrode pins 6. The pair of electrode pins 6 are respectively inserted into the two connection blind holes 14 and welded and fixed so that the electrode pins 6 are electrically connected to the circuit pattern B12, and an electrode plug semi-finished product is obtained; specifically, refer to the attached Figure 9 shown.

[0052] Furthermore, in this embodiment, the material of the electrode pin 6 can be but is not limited to copper or copper alloy, and the shape can be but is not limited to the shape of a Chinese character "feng"; and a nickel plating layer with a thickness of not less than 3 μm and a gold plating layer with a thickness of not less than 3 microinches are sequentially plated on the surface of the electrode pin 6, so as to improve the conductivity, contact reliability and wear resistance of the electrode pin 6 while also improving the bonding stability and conduction performance between the electrode pin 6 and the circuit pattern B12.

[0053] S4: After performing a strengthening treatment and an injection molding protection treatment on the obtained electrode plug semi-finished product, the button-type airbag electrode plug B2 is manufactured; refer to the attached Figure 11 shown.

[0054] Specifically, the method for this embodiment to perform a strengthening treatment on the obtained electrode plug semi-finished product is: refer to the attached Figure 10 shown. Provide a strengthening cap 7, drop an appropriate amount of glue into the strengthening cap 7, and tightly sleeve the strengthening cap 7 outside the electrode plug base of the obtained electrode plug semi-finished product by pressing.

[0055] Furthermore, the strengthening cap 7 can be but is not limited to copper, copper alloy, aluminum alloy or stainless steel materials. The pressure of the above pressing can be preferably controlled at 5-10 Kgf / cm 2 . After completing the above pressing, it is necessary to ensure that there is no void in the strengthening cap 7.

[0056] The method for performing injection molding protection on the obtained electrode plug semi-finished product in this embodiment is as follows: Please refer to the appendix. Figure 11 As shown, an insulating protective shell 8 is tightly fitted over the reinforcing cap 7 and the electrode needle 6 using an injection molding process. Furthermore, the insulating protective shell 8 can be made of, but is not limited to, engineering plastics such as nylon or PPS, and one end of the electrode needle 6 extends beyond the insulating protective shell 8.

[0057] As can be seen from the above, compared with the prior art, the processing method of the button-type airbag electrode plug provided in this embodiment 1 has the following advantages: ① In this embodiment, when manufacturing the electrode plug substrate, the following steps are taken: first, the base plate 1 and the cover plate 3 are manufactured separately; then, the bridge wire 2 is welded and fixed to the circuit pattern A11 of the base plate 1; and then the cover plate 3 is hot-pressed and fixed to the front side of the base plate 1 to obtain the electrode plug substrate. It is understood that the above-mentioned method of manufacturing the electrode plug substrate can ensure that the position of the bridge wire 2 is fixed and not easily deformed, thereby significantly reducing the defect rate of the bridge wire and improving the ignition quality of the electrode plug; in addition, before assembling the cover plate 3 with the base plate 1, the welding quality between the bridge wire 2 and the circuit pattern A11 can be detected and / or optimized, further ensuring the quality of the bridge wire and improving the ignition quality of the electrode plug. ② In this embodiment, a segmented screen printing process is used for filling energetic material 4, which can achieve the following: a) Segmented printing reduces the single printing area and the squeegee travel distance, thereby effectively shortening the single printing time and improving printing efficiency; b) By setting a pressing operation between the two printing operations and optimizing the processing parameters in each printing stage, not only can the energetic material be filled evenly, but the risk of air bubble entrapment can also be reduced, thereby significantly improving the filling density and compactness of the energetic material. This ensures high consistency in the amount of energetic material used and ensures that the energetic material 4 is tightly wrapped / covered with the bridge wire 2 and the circuit pattern A11, further improving the ignition quality of the electrode plug; c) Segmented printing reduces the contact area and contact time between the equipment components and the energetic material in a single printing operation, thereby significantly reducing the risks caused by friction, static electricity or temperature fluctuations, ensuring safe and stable printing operations. ③ In this embodiment, before injection molding the obtained electrode plug semi-finished product, a reinforcing cap 7 is tightly fitted onto the electrode plug substrate to enhance its overall strength. ④ The electrode plug processing method provided in this embodiment is simple, reasonable, easy to process and manufacture, and has low manufacturing cost.

[0058] Example 2:

[0059] This embodiment 2 provides a button-type airbag electrode plug, which is manufactured using the processing method of the button-type airbag electrode plug described in embodiment 1 above.

[0060] Specifically, the button-type airbag electrode plug has the following structure: it includes an electrode plug base, an electrode needle 6, a reinforcing cap 7, and an insulating protective shell 8. The electrode plug base has a base plate 1, a bridge wire 2, and a cover plate 3. The base plate 1 has a substrate A10, a circuit pattern A11 formed on the front side of the substrate A10, a circuit pattern B12 formed on the back side of the substrate A10, a through hole 13 penetrating both the front and back sides of the substrate A10 and connecting the circuit pattern A11 and the circuit pattern B12, and a blind connection hole 14 opening on the back side of the substrate A10 and electrically communicating with the circuit pattern B12. The bridge wire 2 is welded and fixed to the circuit pattern A11, and the cover plate 3 is fixed to the base plate 1. On the front side of the base plate 1, the through hole 31 on the cover plate 3 and the front side of the base plate 1 form a receiving cavity, in which the bridge wire 2 and the circuit pattern A11 are both received; in addition, the receiving cavity of the electrode plug substrate is filled with energetic material 4, and a protective film 5 is sealed on the opening of the receiving cavity; the electrode needle 6 is inserted into the connecting blind hole 14 and welded and fixed, so that the electrode needle 6 is electrically connected to the circuit pattern B12; the reinforcing cap 7 is tightly fitted on the electrode plug substrate, and the insulating protective shell 8 is tightly wrapped around the reinforcing cap 7 and the electrode needle 6 by injection molding process, and one end of the electrode needle 6 extends out of the insulating protective shell 8.

[0061] As can be seen from the above, by means of the processing method of the button-type airbag electrode plug provided in this application, the button-type airbag electrode plug obtained in this embodiment 2 has good quality, high ignition quality and low production cost.

[0062] Finally, the suffixes "A", "B", etc. in the component names in this patent specification (such as substrate A, substrate B, etc.) are only for ease of description and are not intended to limit the scope of implementation of this patent.

[0063] Many specific details have been set forth in the foregoing description to provide a thorough understanding of the present invention. However, the above description is merely a preferred embodiment of the present invention, and the present invention can be implemented in many other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed above. Furthermore, any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, using the methods and techniques disclosed above, without departing from the scope of the present invention. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, shall still fall within the protection scope of the present invention.

Claims

1. A method for processing a button-type airbag electrode plug, characterized in that: Includes the following steps: S1: Fabrication of electrode plug substrate; The substrate A (10) is drilled, plated with copper and fabricated with circuit patterns in sequence to obtain a base plate (1); the base plate (1) is provided with a circuit pattern A (11) formed on the front side of the substrate A (10), a circuit pattern B (12) formed on the back side of the substrate A (10), a through hole (13) that passes through both the front and back sides of the substrate A (10) and connects the circuit pattern A (11) and the circuit pattern B (12), and a blind hole (14) that opens on the back side of the substrate A (10) and is electrically connected to the circuit pattern B (12). The bridge wire (2) is welded and fixed onto the circuit pattern A (11); Drilling is performed on substrate B (30) to obtain cover plate (3) with through hole (31). The cover plate (3) is fixed to the front of the base plate (1) by vacuum hot pressing process to obtain the electrode plug substrate; wherein, the front of the base plate (1) and the through hole (31) form a receiving cavity, and the bridge wire (2) is received in the receiving cavity; S2: After filling the cavity with energetic material (4) by segmented screen printing process, the cavity is vacuum sealed with protective film (5); S3: Insert the electrode needle (6) into the connection blind hole (14) and weld it in place, so that the electrode needle (6) is electrically connected to the circuit pattern B (12) to obtain the electrode plug semi-finished product; S4: After strengthening and injection molding protection treatment of the obtained electrode plug semi-finished product, the button-type airbag electrode plug is obtained.

2. The processing method of the button-type airbag electrode plug according to claim 1, characterized in that: In S2 above, the screen printing process includes a first printing stage, a pressing stage, and a second printing stage performed sequentially, wherein... The processing parameters of the first printing stage are: the screen printing plate is made of steel screen or copper screen, and the tension of the screen printing plate is 10-20 N; the pressure of the squeegee is 0.1-1 kg / cm 2 , the speed is 0.2-0.5 m / min, and the angle is 60°-90°; the temperature in the processing environment is 16-24℃, and the humidity is 60%-90%. The processing parameters of the pressing stage are: the pressing temperature is 150-180℃, the pressing pressure is 20-100Kgf / cm 2 , and the pressing time is 60-120min. The processing parameters of the second printing stage are: steel or copper screen is used for the screen printing plate, and the tension of the screen printing plate is 10-20 N; the pressure of the squeegee is 1-3 kg / cm 2 , the speed is 0.1-0.3 m / min, the angle is 60-90°; the temperature in the processing environment is 16-24℃, and the humidity is 60%-90%. The processing parameters of the second printing stage are: steel or copper screen is used for the screen printing plate, and the tension of the screen printing plate is 10-20 N; the pressure of the squeegee is 1-3 kg / cm 2 , the speed is 0.1-0.3 m / min, the angle is 60-90°; 3. The processing method of the button-type airbag electrode plug according to claim 1, characterized in that: In the above S2, the protective film (5) is an epoxy resin film, and the protective film (5) is attached to the opening of the accommodating cavity by a vacuum film attaching machine, and the processing parameters of the vacuum film attaching machine are: the attaching temperature is 65-75°C, the vacuum reaching time is less than 20s, and the film pressing pressure is 5-7Kgf / cm 2 ; In addition, after the film is attached, the protective film (5) is subjected to a press treatment at a press temperature of 150°C to 180°C and a press pressure of 20 to 100 Kgf / cm2for 60 to 120 minutes. 2 In addition, after the film is attached, the protective film (5) is subjected to a press treatment at a press temperature of 150°C to 180°C and a press pressure of 20 to 100 Kgf / cm 4. The processing method of the button-type airbag electrode plug according to claim 1, characterized in that: In the above S1, the substrate A (10) and the substrate B (30) are each independently made of ceramic plate or FR4 plate or a composite plate of both; The through hole (13) and the connecting blind hole (14) are both metallized holes, and the through hole (31) is an insulating hole.

5. The processing method of the button-type airbag electrode plug according to claim 1, characterized in that: In the above S1, a composite functional layer is plated at the junction of the bridge wire (2) and the circuit pattern A (11), and the composite functional layer is composed of at least two of the following layers: copper layer, nickel layer and tin layer.

6. The processing method of the button-type airbag electrode plug according to claim 1, characterized in that: In S1 above, the processing parameters of the vacuum hot pressing process are: vacuum degree less than -0.1 MPa, hot pressing temperature of 150℃~180℃, and hot pressing pressure not less than 20 kgf / cm². 2 .

7. The processing method of the button-type airbag electrode plug according to claim 1, characterized in that: In the electrode plug substrate, the outer peripheral edge of the cover plate (3) is aligned and connected with the outer peripheral edge of the base plate (1).

8. The processing method of the button-type airbag electrode plug according to claim 1, characterized in that: A nickel plating layer and a gold plating layer are sequentially plated on the surface of the electrode needle (6), wherein the thickness of the nickel plating layer is not less than 3 μm and the thickness of the gold plating layer is not less than 3 micro inches.

9. The processing method of the button-type airbag electrode plug according to claim 1, characterized in that: In the above S4, the method for strengthening the obtained electrode plug semi-finished product is as follows: a reinforcing cap (7) is tightly fitted onto the electrode plug substrate of the obtained electrode plug semi-finished product. The method for injection molding protection of the obtained electrode plug semi-finished product is as follows: an insulating protective shell (8) is tightly fitted on the reinforcing cap (7) and the electrode needle (6) by injection molding process; in addition, one end of the electrode needle (6) extends out of the insulating protective shell (8).

10. A button-type airbag electrode plug, characterized in that: It is manufactured using the processing method of any one of claims 1-9 for the button-type airbag electrode plug.

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