Safety air bag igniter suitable for vehicle-mounted PoE system

Abstract

The utility model discloses a supplementary restraint system igniter suitable for a vehicle-mounted PoE (power over Ethernet) system, which comprises an ignition control module and a protection module, the ignition control module is provided with a PCB (printed circuit board) substrate, an ignition chip which is electrically arranged on the PCB substrate and is embedded in an initiating explosive during application, and an external connection piece which can communicate the ignition chip with an external power supply, the ignition chip can emit heat to detonate the initiating explosive after being communicated with an external power supply; the protection module is also electrically arranged on the PCB substrate and is in parallel connection with the ignition chip so as to carry out anti-static protection on the ignition chip. The safety air bag igniter has an excellent ignition effect and an excellent electrostatic protection effect, the antistatic capacity of the igniter can be greatly improved while low-power ignition is achieved, and the use requirement of a vehicle-mounted PoE system is well met.

Description

TECHNICAL FIELD

[0001] The utility model relates to ignition device technical field especially suitable for airbag ignition device of vehicle-mounted PoE system. BACKGROUND

[0002] It is known that the airbag system is a passive safety protection system, which is used in cooperation with the seat belt to provide effective protection against collision for the passengers.

[0003] In the conventional airbag system, each ignition device needs to be arranged with a power harness from the electronic control unit (ECU) separately, and the cross-sectional area of the power harness is designed to be relatively thick to ensure stable power supply, but this results in high cost of the harness. To solve the above problem, some vehicle manufacturers have proposed to use PoE (Power Over Ethernet) Ethernet power supply mode, which can greatly save the cost of the harness. According to the calculation, after using the PoE Ethernet power supply mode, each vehicle can save hundreds of yuan in cost, and if there are 300 million vehicles produced in China every year, the vehicle manufacturers can save more than 5 billion yuan in cost every year.

[0004] However, due to the small current of the PoE network, the ignition device must also be designed with small power, such as: the starting energy of the ignition device is reduced from 1 joule to 0.4 millijoule, but this small power design will result in a decrease in the anti-static ability of the ignition device, thereby resulting in a decrease in the ignition performance of the ignition device, the ignition device cannot ignite in time within the specified time, and further resulting in the airbag cannot work normally.

[0005] Therefore, the utility model is provided. SUMMARY

[0006] In order to overcome the above defects, the utility model provides an airbag ignition device suitable for vehicle-mounted PoE system, which has excellent ignition effect and static protection effect, can realize small power ignition while greatly improving the anti-static ability of the ignition device, and well meets the use requirement of the vehicle-mounted PoE system.

[0007] The utility model discloses in order to solve its technical problem adopts the technical scheme: a kind of airbag igniter suitable for vehicle PoE system, including ignition control module and protection module, the ignition control module is equipped with PCB substrate, electrically set in the PCB substrate and in application is buried in the ignition chip of initiating explosive and can the external connection piece of ignition chip is connected with external power supply, the ignition chip can heat to detonate initiating explosive after being connected with external power supply;The protection module is also electrically set on the PCB substrate, and simultaneously with the ignition chip is parallel relationship, to carry out anti-static protection to the ignition chip.

[0008] As a further improvement of the utility model, the protection module is provided with an anti-static capacitor and an anti-static semiconductor device arranged in parallel on the PCB substrate.

[0009] As a further improvement of the utility model, the anti-static semiconductor device uses at least one of a TVS diode and an ESD static diode.

[0010] As a further improvement of the utility model, two through holes A are provided on the PCB substrate, respectively penetrating the opposite two side surfaces, and a connecting copper layer A is arranged on the inner wall of each through hole A. On the opposite two side surfaces of the PCB substrate, a solder pad A electrically connected to the connecting copper layer A is arranged around the outside of each through hole A.

[0011] The external connection piece is provided with two electrode pins, and the two electrode pins are respectively fastened through the two through holes A. The tail ends of the two electrode pins are respectively electrically connected to the positive and negative poles of the external power supply, and the head ends of the two electrode pins are respectively electrically connected to the positive and negative poles of the ignition chip.

[0012] As a further improvement of the utility model, a plurality of sharp electrodes electrically connected to the solder pad A are fixedly arranged on one side surface of the PCB substrate.

[0013] A connecting line A electrically connected to the solder pad A is fixedly arranged on the opposite side surface of the PCB substrate. The protection module is connected in parallel with the ignition chip through the connecting line A and the solder pad A.

[0014] As a further improvement of the utility model, the external connection piece is provided with two electrode pins. The head end of the first electrode pin is fixedly embedded in the PCB substrate and electrically connected to the first polarity solder pad on the PCB substrate. The head end of the second electrode pin is electrically connected to the second polarity solder pad on the PCB substrate through a connecting piece with conductive function. The tail ends of the two electrode pins are respectively electrically connected to the positive and negative poles of the external power supply.

[0015] As a further improvement of the utility model, the PCB substrate is provided with through holes B and C penetrating through the front and back surfaces thereof, the inner walls of the through holes B and C are respectively provided with connecting copper layers B, the first polarity pads electrically connected with the connecting copper layers B in the through holes B are arranged on the front surface of the PCB substrate and around the through holes B, and the second polarity pads electrically connected with the connecting copper layers B in the through holes C are respectively arranged on the front and back surfaces of the PCB substrate and around the through holes C.

[0016] The connecting piece is a column structure made of conductive material, and is welded and fixedly connected with the second polarity pad on the back surface of the PCB substrate.

[0017] The head end of the first electrode needle is tightly embedded in the through hole B after penetrating through the connecting piece, and the head end of the second electrode needle is welded and fixedly connected with the side of the connecting piece away from the PCB substrate.

[0018] As a further improvement of the utility model, a plurality of connecting lines B electrically connected with the first polarity pads and the second polarity pads are fixedly arranged on the front surface of the PCB substrate, and the ignition chip and the protection module are connected in parallel through the plurality of connecting lines B.

[0019] As a further improvement of the utility model, an insulating shell is further arranged, the insulating shell tightly wraps the local ignition control module and the protection module, the insulating shell is provided with a receiving cavity for containing the initiating explosive, and the ignition chip is sealed and arranged in the receiving cavity.

[0020] As a further improvement of the utility model, an insulating cover for containing the initiating explosive is further arranged, the insulating cover covers the PCB substrate and is sealingly and fixedly connected with the connecting piece.

[0021] The safety air bag igniter has excellent ignition effect and electrostatic protection effect, can realize low-power ignition, greatly improves the anti-static ability of the igniter, and meets the use requirements of the vehicle PoE system. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1The embodiment 1 of the utility model discloses a safety air bag igniter for vehicle-mounted PoE system's three-dimensional structure schematic diagram;

[0023] Figure 2 For Figure 1 The side view structure schematic diagram of the safety air bag igniter shown in the figure is shown in the figure.

[0024] Figure 3 For Figure 1 The enlarged schematic diagram of the partial structure of the safety air bag igniter shown in the figure is shown in the figure.

[0025] Figure 4 For Figure 3 The front view structure schematic diagram of the PCB substrate shown in the figure is shown in the figure.

[0026] Figure 5 For Figure 3 The structure schematic diagram when the PCB substrate and the protection module are assembled together is shown in the figure.

[0027] Figure 6 The embodiment 2 of the utility model discloses a safety air bag igniter for vehicle-mounted PoE system's exploded structure schematic diagram.

[0028] Figure 7 For Figure 6 The structure schematic diagram when the PCB substrate, the ignition chip and the protection module are assembled together is shown in the figure.

[0029] The following description is made in conjunction with the drawings:

[0030] 10, PCB substrate, 100, perforation A, 101, positive pad A, 102, negative pad A, 103, perforation B, 104, perforation C, 105, connecting copper layer B, 106, first polarity pad, 107, second polarity pad, 11, ignition chip, 12, external component, 120, electrode needle, 13, sharp electrode, 14, connecting circuit A, 15, connecting piece, 16, connecting circuit B, 20, anti-static capacitor, 21, anti-static semiconductor device, 3, insulating shell, 30, containing cavity, 4, insulating shell. DETAILED DESCRIPTION

[0031] The following description is made in conjunction with the drawings:

[0032] Embodiment 1:

[0033] The embodiment 1 provides a safety airbag igniter, which functions to cause a gas generator in a safety airbag system to generate gas by ignition when a car collides, so that the safety airbag is inflated rapidly to protect the car occupants from injury. The safety airbag igniter provided by the embodiment 1 can realize low-power ignition and greatly improve the anti-static capability of the igniter, and can well meet the use requirement of a PoE system.

[0034] Please refer to the accompanying drawings Figure 1 to the accompanying drawings Figure 5 The safety airbag igniter provided by the embodiment 1 has the structure that the safety airbag igniter comprises an ignition control module and a protection module, the ignition control module is provided with a PCB substrate 10, an ignition chip 11 which is electrically arranged on the PCB substrate 10 and is embedded in an initiating explosive when applied, and an external connecting piece 12 which can connect the ignition chip 11 with an external power supply. After the ignition chip 11 is connected with the external power supply, the ignition chip 11 can generate heat to produce heat and then ignite the initiating explosive to complete the ignition operation. The protection module is also electrically arranged on the PCB substrate 10 and is in parallel connection with the ignition chip 11 to prevent static electricity from damaging the ignition chip 11. It can be understood that the safety airbag igniter provided by the embodiment 1 has excellent ignition effect and static electricity protection effect, and can well meet the use requirement of the PoE system. In addition, the safety airbag igniter has excellent anti-static capability, and can ensure the safety of the igniter product in the processes of assembly, detection, transportation and storage, and further guarantees the quality of the igniter product.

[0035] The specific structure of the safety airbag igniter provided by the embodiment 1 is described in detail as follows.

[0036] First, please continue to refer to the accompanying drawings Figure 3 to the accompanying drawings Figure 5As shown, in the embodiment 1, the specific assembly structure of the ignition control module is that: the PCB substrate 10 is provided with two through holes A100 penetrating through the opposite two sides (i.e. front and back sides) thereof, and the inner walls of the two through holes A100 are respectively provided with a connecting copper layer A (not shown in the figure), and the opposite two sides of the PCB substrate 10 are respectively provided with a solder pad A electrically connected with the connecting copper layer A around the two through holes A100; further, the solder pads A on the front and back sides of the PCB substrate 10 and around the two ends of the first through hole A100 are defined as positive solder pads A101, and the solder pads A on the front and back sides of the PCB substrate 10 and around the two ends of the second through hole A100 are defined as negative solder pads A102, and it can be understood that the two positive solder pads A101 are respectively electrically connected with the connecting copper layer A in the first through hole A100, and the two negative solder pads A102 are respectively electrically connected with the connecting copper layer A in the second through hole A100. The external connecting piece 12 is provided with two electrode pins 120, and the two electrode pins 120 are respectively fixedly penetrated through the PCB substrate 10, specifically: the two electrode pins 120 are respectively fastened through the two through holes A100 and simultaneously welded and fixedly connected with the solder pads A (i.e. the positive solder pads A101 and the negative solder pads A102), so as to improve the stability of the communication between the two electrode pins 120 and the solder pads A; the tail ends and the head ends of the two electrode pins 120 respectively extend outside the opposite two sides of the PCB substrate 10, and the tail ends of the two electrode pins 120 are respectively electrically connected with the positive and negative poles of an external power supply, and the head ends of the two electrode pins 120 are respectively welded and fixedly connected with the positive and negative poles of the ignition chip 11, so as to realize the electrical connection / communication between the two electrode pins 120 and the ignition chip 11; that is, it can be understood that the ignition chip 11 is fixedly assembled on the PCB substrate 10 through the two electrode pins 120, and the ignition chip 11 and the PCB substrate 10 are also respectively in communication with the external power supply through the two electrode pins 120.

[0037] Supplementary explanation: the specific forming method of the through hole A100, the connecting copper layer A and the solder pad A belongs to the common knowledge in the field of circuit board processing, and therefore is not described in detail here.

[0038] Further, regarding the ignition chip 11, the following chip types can be preferably adopted, but are not limited to: the patch bridge wire type ignition resistor provided in Chinese patent CN2023114092154, or the heating resistor provided in Chinese patent CN2024219366589. Among them, the most preferred heating resistor structure provided in Chinese patent CN2024219366589 is: including a substrate part and a resistance wire made of tungsten alloy material, the substrate part is provided with a substrate body, a connection circuit pattern provided on the front surface (which is a plane) of the substrate body, a solder pad B (which is distinguished from other solder pads described in the present application) provided on the back surface of the substrate body, and a connection copper body provided on the substrate body and penetrating the front and back surfaces of the substrate body respectively, the connection copper body is in communication with the solder pad B; the resistance wire is arranged as one or more than one, and at least two is preferred, at least two resistance wires are arranged on the front surface of the substrate body and are electrically connected with the connection circuit pattern according to the product electrical design requirements, together forming a heating branch, the heating branch is also in communication with the connection copper body; in addition, a functional layer is arranged at the position where the resistance wire is connected with the connection circuit pattern, and at the position where the heating branch is connected with the connection copper body. The above-mentioned heating resistor has good heat aggregation effect, high heating temperature, which can be greater than 3200℃, and more importantly, the above-mentioned heating resistor can achieve a response speed of 50 microseconds, a minimum ignition current of 300mA, a minimum ignition energy of 0.4mJ and other technical performances. In summary, by using the above-mentioned heating resistor, the ignition device described in embodiment 1 can achieve a response time of microseconds, low-power ignition, and an ignition success rate of 100%, which well meets the safety airbag system use requirements of the vehicle-mounted PoE system.

[0039] Further, regarding the electrode needle 120, the embodiment 1 preferably adopts 62 brass (wherein the copper content is 62%) material, and a nickel plating layer with a thickness greater than 3μm and a gold plating layer with a thickness greater than 1 microinch are further plated on the surface of the electrode needle 120 to effectively improve the conductivity and wear resistance of the electrode needle 120.

[0040] Further, the embodiment 1 further fixes a plurality of sharp electrodes 13 electrically connected with the soldering pad A (i.e. the positive soldering pad A101 and the negative soldering pad A102) on one side (specifically, the front side) of the PCB substrate 10 through a photoetching process (which is common knowledge in the field of circuit board processing). Further, if the sharp electrode 13 connected with the positive soldering pad A101 is defined as a first sharp electrode, and the sharp electrode 13 connected with the negative soldering pad A102 is defined as a second sharp electrode, preferably, the tips of the plurality of first sharp electrodes and the tips of the plurality of second sharp electrodes are arranged one by one. It can be understood that by arranging a plurality of sharp electrodes 13, on the one hand, the electrical performance of the PCB substrate 10 can be effectively improved, which helps to prevent static damage, reduce signal attenuation and noise interference, and improve the stability and reliability of the circuit; on the other hand, a firm mechanical connection can be formed, further enhancing the bonding strength between the PCB substrate 10 and the electrode needle 120.

[0041] Further, the embodiment 1 further fixes a plurality of sharp electrodes 13 electrically connected with the soldering pad A (i.e. the positive soldering pad A101 and the negative soldering pad A102) on one side (specifically, the front side) of the PCB substrate 10 through a photoetching process (which is common knowledge in the field of circuit board processing). Further, if the sharp electrode 13 connected with the positive soldering pad A101 is defined as a first sharp electrode, and the sharp electrode 13 connected with the negative soldering pad A102 is defined as a second sharp electrode, preferably, the tips of the plurality of first sharp electrodes and the tips of the plurality of second sharp electrodes are arranged one by one. It can be understood that by arranging a plurality of sharp electrodes 13, on the one hand, the electrical performance of the PCB substrate 10 can be effectively improved, which helps to prevent static damage, reduce signal attenuation and noise interference, and improve the stability and reliability of the circuit; on the other hand, a firm mechanical connection can be formed, further enhancing the bonding strength between the PCB substrate 10 and the electrode needle 120.

[0042] Next, please continue to refer to the accompanying Figure 3 and the accompanying Figure 5 In the embodiment 1, the protection module preferably adopts the following implementation structure: the protection module is provided with an anti-static capacitor 20 and an anti-static semiconductor device 21 arranged in parallel on the PCB substrate 10. Specifically, the anti-static capacitor 20 and the anti-static semiconductor device 21 are connected in parallel through the above-mentioned connection line A14.

[0043] Further, the capacitance of the anti-static capacitor 20 is 100PF-2.2UF, and the withstand voltage reaches 24-100V; the anti-static semiconductor device 21 adopts at least one of a TVS diode and an ESD static diode, and the accompanying Figure 5The anti-static semiconductor device 21 is shown as an ESD static diode; of course, the anti-static semiconductor device 21 is not limited to the above two types of semiconductor devices in practical applications. It can be understood that the anti-static capacitor 20 can use the energy storage and potential energy characteristics of the capacitor to protect against damage caused by electrostatic discharge to the ignition chip 11 and other electronic devices. The TVS (TRANSIENT VOLTAGE SUPPRESSOR) diode can use the characteristics of semiconductor materials to offset transient voltages to achieve good electrostatic protection. The ESD (Electrostatic Discharge) static diode can expand the conduction current by increasing the area of the PN junction, which plays a good role in electrostatic protection. In summary, the combination of the anti-static capacitor 20 and the anti-static semiconductor device 21 provided by the embodiment 1 can pass the 25KV electrostatic discharge test.

[0044] Subsequently, please continue to refer to the attached Figure 1 to the attached Figure 3 As shown in the attached

[0045] In summary, the airbag igniter of the embodiment 1 has excellent ignition effect and electrostatic protection effect, can achieve low-power ignition while greatly improving the anti-static capability of the igniter, and well meets the use requirements of the vehicle PoE system.

[0046] Embodiment 2:

[0047] The embodiment 2 also provides an airbag igniter suitable for a vehicle PoE system, and compared with the embodiment 1, the main difference of the airbag igniter of the embodiment 2 is that: ① the specific assembly structure of the ignition control module in the embodiment 2 is different from that of the embodiment 1; ② the layout position of the protection module in the embodiment 2 is different from that of the embodiment 1; ③ the container structure for containing the initiating explosive in the embodiment 2 is different from that of the embodiment 1.

[0048] Specifically, regarding the above difference ①, the specific assembly structure of the ignition control module in the embodiment 2 is that: please refer to the attached Figure 6 and the attached Figure 7As shown, the PCB substrate 10 is provided with a through hole B103 and a through hole C104 penetrating through the front and back surfaces thereof, and a connecting copper layer B105 is arranged on the inner wall of the through hole B103 and the through hole C104. The first polarity pad 106 is arranged on the front surface of the PCB substrate 10 and electrically connected to the connecting copper layer B105 in the through hole B103. The second polarity pad 107 is arranged on the front and back surfaces of the PCB substrate 10 and electrically connected to the connecting copper layer B105 in the through hole C104. It is understood that the polarity of the first polarity pad 106 is opposite to that of the second polarity pad 107. The first polarity pad 106 is arranged on the front surface of the PCB substrate 10, and the second polarity pad 107 is arranged on the front and back surfaces of the PCB substrate 10. In addition, a plurality of connecting lines B16 are arranged on the front surface of the PCB substrate 10 and electrically connected to the first polarity pad 106 and the second polarity pad 107. The external connecting member 12 is provided with two electrode pins 120. The head end of the first electrode pin 120 is fixedly arranged in the through hole B103 of the PCB substrate 10 and electrically connected to the first polarity pad 106 on the PCB substrate 10. The head end of the second electrode pin 120 is electrically connected to the second polarity pad 107 on the PCB substrate 10 through the connecting member 15 having the electrically conductive function. The tail ends of the two electrode pins 120 are electrically connected to the positive and negative poles of an external power source, respectively. The ignition chip 11 is fixedly arranged on the front surface of the PCB substrate 10 through the connecting lines B16, and the ignition chip 11 is in communication with the external power source through the connecting lines B16 and the two electrode pins 120.

[0049] Further, the specific forming methods of the through hole B103, the through hole C104, the connecting copper layer B105, the first polarity pad 106, the second polarity pad 107 and the connecting lines B16 are all known in the field of circuit board processing, and thus are not described in detail herein. The specific structures of the ignition chip 11 and the electrode pins 120 can adopt the same technical solutions as those in Embodiment 1, and thus are not described in detail herein.

[0050] Further, the connecting piece 15 is a column structure made of conductive material (such as copper material), and the connecting piece 15 is welded and fixedly connected with the second polarity pad 107 on the back surface of the PCB substrate 10. Further, in order to ensure the connection stability and communication stability between the connecting piece 15 and the PCB substrate 10, the through hole C104 and the second polarity pad 107 are respectively arranged as a plurality of through holes and a plurality of second polarity pads in the embodiment 2, and the connecting piece 15 and other regions on the back surface of the PCB substrate 10 are designed to be insulatively fixed (for example, the insulative fixing can be realized by laminating a semi-cured sheet between the connecting piece 15 and the predetermined region on the back surface of the PCB substrate 10).

[0051] Further, based on the configuration of the connecting piece 15, in the embodiment 2, the head end of the first electrode needle 120 is insulatively and tightly arranged in the through hole B103 after penetrating the connecting piece 15, and it can be understood that the insulating piece (such as an insulating rubber sleeve) is arranged between the first electrode needle 120 and the connecting piece 15.

[0052] Regarding the above difference point 2, based on the layout mode of the connection line B16, the protection module in the embodiment 2 is fixed on the front surface of the PCB substrate 10 through the connection line B16, and is also connected in parallel with the ignition chip 11 through the connection line B16.

[0053] As for the specific structure of the protection module, the same technical solution as that in the embodiment 1 can be adopted, and thus no further description is given here.

[0054] Regarding the above difference point 3, the insulating cover 4 for containing the detonating agent is also arranged in the embodiment 2, and the insulating cover 4 is arranged outside the PCB substrate 10 and is sealingly and fixedly connected with the connecting piece 15.

[0055] In summary, compared with the embodiment 1, the airbag igniter provided in the embodiment 2 also has excellent ignition effect and electrostatic protection effect, can realize low-power ignition, greatly improves the anti-static capability of the igniter, and well meets the use requirements of the vehicle PoE system.

[0056] Finally, the prefixes of the component names in the utility model patent specification, such as "first", "second" and the like (such as first polarity pad, second polarity pad and the like), and the suffixes of the component names, such as "A", "B" and the like (such as through hole A, through hole B and the like), are only for the convenience of clear description, and are not used to limit the range of the utility model patent.

[0057] In the above description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the above description is merely a preferred embodiment of the present application, and the present application can be carried out in many different ways than described herein, and the present application is not limited to the above disclosed specific implementation. Meanwhile, any person skilled in the art can utilize the above disclosed methods and technical contents to make many possible changes and modifications to the technical solutions of the present application, or modify them into equivalent embodiments with equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the technical solutions of the present application, still belongs to the protection scope of the technical solutions of the present application.

Claims

1. An airbag igniter suitable for vehicle-mounted PoE systems, characterized in that: The ignition control module and the protection module are arranged on the PCB substrate (10), and the ignition chip (11) is arranged on the PCB substrate (10) and is embedded in the detonating agent in application, and the ignition chip (11) can generate heat to detonate the detonating agent after being connected with the external power supply; the protection module is also arranged on the PCB substrate (10) and is in parallel connection with the ignition chip (11) to prevent static electricity from damaging the ignition chip (11).

2. The airbag igniter suitable for use in a vehicle PoE system according to claim 1, characterized in that: The protection module is provided with an anti-static capacitor (20) and an anti-static semiconductor device (21) arranged in parallel on the PCB substrate (10).

3. The airbag igniter suitable for use in a vehicle PoE system according to claim 2, wherein: The anti-static semiconductor device (21) adopts at least one of a TVS diode and an ESD static diode.

4. The airbag igniter suitable for use in a vehicle PoE system according to claim 1, wherein: The PCB substrate (10) is provided with two through holes A (100) penetrating through opposite sides, and the inner walls of the two through holes A (100) are respectively provided with a connecting copper layer A, and the PCB substrate (10) is provided with a solder pad A electrically connected with the connecting copper layer A around the two through holes A (100) on the opposite sides. The external connecting piece (12) is provided with two electrode pins (120), and the two electrode pins (120) are respectively fastened through the two through holes A (100), and the tail ends of the two electrode pins (120) are respectively electrically connected with the positive and negative poles of the external power supply, and the head ends of the two electrode pins (120) are respectively electrically connected with the positive and negative poles of the ignition chip (11).

5. The airbag igniter suitable for use in a vehicle PoE system according to claim 4, wherein: A plurality of sharp electrodes (13) electrically connected with the solder pad A are fixedly arranged on one side of the PCB substrate (10). A connecting line A (14) electrically connected with the solder pad A is fixedly arranged on the opposite side of the PCB substrate (10), and the protection module is connected in parallel with the ignition chip (11) through the connecting line A (14) and the solder pad A.

6. The airbag igniter suitable for use in a vehicle PoE system according to claim 1, wherein: The external connecting piece (12) is provided with two electrode pins (120), the head end of the first electrode pin (120) is fixedly embedded in the PCB substrate (10) and is electrically connected with the first polarity solder pad (106) on the PCB substrate (10), the head end of the second electrode pin (120) is electrically connected with the second polarity solder pad (107) on the PCB substrate (10) through a connecting piece (15) with a conductive function, and the tail ends of the two electrode pins (120) are respectively electrically connected with the positive and negative poles of the external power supply.

7. The airbag igniter suitable for use in a vehicle PoE system according to claim 6, wherein: The PCB substrate (10) is provided with through holes B (103) and through holes C (104) penetrating through the front and back surfaces thereof, the inner walls of the through holes B (103) and the through holes C (104) are respectively provided with connecting copper layers B (105), the first polarity pads (106) electrically connected with the connecting copper layers B (105) in the through holes B (103) are arranged on the front surface of the PCB substrate (10) and around the through holes B (103), and the second polarity pads (107) electrically connected with the connecting copper layers B (105) in the through holes C (104) are respectively arranged on the front and back surfaces of the PCB substrate (10) and around the through holes C (104); The connecting piece (15) is a column structure made of conductive material, and the connecting piece (15) is welded and fixedly connected with the second polarity pad (107) on the back surface of the PCB substrate (10); The head end of the first electrode needle (120) is tightly embedded in the through hole B (103) after penetrating through the connecting piece (15), and the head end of the second electrode needle (120) is welded and fixedly connected with the side of the connecting piece (15) away from the PCB substrate (10).

8. The airbag igniter suitable for use in a vehicle PoE system according to claim 7, wherein: A plurality of connecting lines B (16) electrically connected with the first polarity pads (106) and the second polarity pads (107) are fixedly arranged on the front surface of the PCB substrate (10), and the ignition chip (11) and the protection module are connected in parallel through the plurality of connecting lines B (16).

9. The airbag igniter suitable for use in a vehicle PoE system according to claim 4, wherein: An insulating shell (3) is further provided, which tightly wraps the local ignition control module and the protection module, and the insulating shell (3) is provided with a receiving cavity (30) for containing the detonating agent, and the ignition chip (11) is sealed and arranged in the receiving cavity (30).

10. The airbag igniter suitable for use in a vehicle PoE system according to claim 7, wherein: An insulating cover (4) for containing the detonating agent is further provided, which covers the PCB substrate (10) and is sealed and fixedly connected with the connecting piece (15).

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