PYROTECHNIC IGNITION PILL AND METHOD FOR MANUFACTURING A PYROTECHNIC IGNITION PILL.

Abstract

A pyrotechnic ignition pellet comprising a housing, an ignition pellet charge housed in the housing, at least two terminal contacts connected to the ignition charge, wherein the terminal contacts are guided out of the housing through a glass sleeve, wherein the terminal contacts in the region of the ignition charge have a round cross-section profile and the terminal contacts outside the housing have an angular cross-section profile.

Description

Pyrotechnic ignition tablet and method for manufacturing a pyrotechnic ignition tablet FIELD OF INVENTION The subject matter relates to a pyrotechnic ignition tablet and a method for manufacturing a pyrotechnic ignition tablet. BACKGROUND OF THE INVENTION Pyrotechnic ignition tablets are well-known and widely used in industry. In particular, in automotive applications, which are critical for safety, the activation of seatbelt pretensioners, airbags, circuit breakers, etc., is often pyrotechnically triggered. An ignition tablet can be used as a gas generator or as a propellant charge. Specifically for disconnecting current-carrying electrical conductors, a sufficiently high disconnection energy is required to ensure safe disconnection of the conductors in the event of a collision. Due to the widespread use of pyrotechnic ignition tablets, a manufacturing process has been established in which the ignition charge is hermetically sealed in a housing, and ignition is achieved by two wire contacts guided outward through a glass cap.In this case, the ignition contacts are wire-shaped and round. This is problematic for the use of pyrotechnic ignition pellets in newer applications, such as pyromechanical disconnect switches for automotive electrical systems. For automotive wiring, connector geometries designed for angled connection terminals are known and used. Therefore, they are incompatible with conventional pyrotechnic ignition pellets. BRIEF DESCRIPTION OF THE INVENTION The subject matter was therefore based on the objective of making available a pyrotechnic ignition tablet for electronic connector housings. In accordance with the objective, this objective is achieved by means of an ignition pill according to claim 1 and a method according to claim 13. The structure of a pyrotechnic ignition pellet is well known. A glass pellet is enclosed in a sleeve / ring. Terminal contacts are passed through the glass pellet. In a fusion process, the glass pellet melts, forming a gas-tight seal with the terminal contacts. A cover is welded to the sleeve / ring, and inside the cover, connected to the terminal contacts, is an ignition charge. The glass pellet, along with the cover and sleeve / ring, forms the ignition pellet housing, which hermetically seals the ignition charge. A hermetic seal is particularly airtight against liquids and / or gases. The terminal contacts are electrically connected to the ignition charge inside the housing, so that the ignition charge can be activated by an electrical ignition pulse and detonated. The gas-tight and / or moisture-tight glass passage ensures that the ignition charge does not come into contact with moisture, even during a very long service life, and is therefore always ready for use. To enable the use of the ignition module with conventional connectors for automotive applications, it is proposed that the terminal contacts in the ignition load region have a round cross-section profile, while the terminal contacts outside the housing have an angular cross-section profile. "Angular" in this sense can be understood to mean, in particular, that at least two lateral edges run parallel to each other in the cross-section profile. A degree of ovality may be present at the transition to adjacent lateral edges. According to one embodiment, it is proposed that the terminal contacts be formed from round wires and plastically deformed outside the housing. Through plastic deformation, for example by pressing, the round cross-section profile can be deformed along at least two lateral edges so that it becomes angular. According to one embodiment, it is proposed that the terminal contacts have a first contact distance between them in the area of ​​the glass sleeve and a Qfrzznn / zznz / B / YiAi The second contact distance between them outside the housing is greater than the first. The terminal contacts can thus be separated and have a greater distance between them. In this way, the contacts can be inserted into the openings provided in the connection plugs. According to one embodiment, it is proposed that the terminal contacts run straight and parallel to each other within the glass sleeve, and outside the glass sleeve run at an angle to each other in a central section, then again straight and parallel to each other in an end section. Outside the glass sleeve and outside the housing, the terminal contacts are deformed so that they point in opposite directions. In their end sections, however, they can be deformed again to be straight and parallel to each other. According to one embodiment, it is proposed that the terminal contacts be guided through two opposing glass bushings. A glass bushing can be arranged in the housing, one on the cover and one on the base. The terminal contacts can be guided through one of the two glass bushings. According to one embodiment, it is proposed that the terminal contacts be bent outwards from the glass sleeve. When reference is made here to the outside of the glass sleeve, this always refers to the region of the terminal contacts located on the side of the glass sleeve facing away from the ignition load. According to one design, the bending begins at a distance of at least the radius of the terminal contact from the glass sleeve. During manufacturing, the terminal contacts are arranged as parallel wires within the glass sleeve. The bending must not cause mechanical stress on the glass sleeve, otherwise it could break. To avoid or minimize the effect of bending on the glass sleeve, the bending of the terminal contacts only begins at a certain distance from the glass sleeve. This distance is preferably at least equal to the radius of the terminal contact. In this way, the bending moments and / or bending stresses can be sufficiently absorbed, and deformation of the terminal contact within the glass sleeve can be avoided. According to one embodiment, the glass socket comprises a glass pellet and a support ring. In the manufacturing process, the glass pellet is melted, and the molten glass is pressed against the terminal contacts. A housing cover is arranged on the support ring at a material joint, in particular welded to it. The ignition load is arranged inside the cover. The terminal contacts are short-circuited together via an ignition wire running inside the ignition load. An electrical ignition pulse is conducted through the ignition wire, which heats up as a result of the pulse and thus ignites the ignition load. According to one embodiment, it is proposed that on the side of the glass cap opposite the ignition load, the terminal contacts are guided in a connector housing. The ignition module may comprise a housing that includes the ignition load. In addition, another housing may be provided in which the terminal contacts are guided and which is configured as a connector face. The connector face fits onto and can be inserted into a mated connector contact. Within the connector housing, the connector contacts can be guided and bent. According to one embodiment, the connector housing is made of plastic, specifically injection molded. The connector housing is molded into the support ring. According to one formulation, the angular cross-section profile is formed by two longitudinal edges running parallel to each other and two transverse edges facing each other, with the transverse edges configured in an arc shape, specifically a convex-arched shape. In the cross-section through the end contacts, these can be approximately oval with two lateral edges parallel to each other. This can be understood as angular. Another aspect is a method of manufacturing a pyrotechnic ignition pellet. Here, a housing is first provided with an enclosed ignition pellet with at least two terminal contacts extending out of the housing through a glass cap. Subsequently, the ignition pellet is mechanically fixed, and the terminal contacts are mechanically deformed outside the housing, on the side of the glass cap opposite the ignition charge, so that the terminal contacts outside Qfrzznn / zznz / E / YiAi the casing has an angular cross-section profile. According to one modality, the profile of the angular cross section is obtained by pressing. Furthermore, the terminal contacts can be bent out of the housing. In this case, it is possible, for example, to fix the terminal contacts and bend them at their free ends. Preferably, the fixing rests directly against the glass sleeve and thus prevents the forces introduced by bending from reaching the glass sleeve. BRIEF DESCRIPTION OF THE FIGURES The object is then explained in more detail with reference to a drawing that shows examples of modality. The drawing shows: Figures a, b a longitudinal section through a pyrotechnic ignition pellet according to a first modality. Figures 2a, b, a pyrotechnic ignition tablet according to another modality. Figure 3a, b cross-sections through terminal contacts. Figure 4 is a view of a pyrotechnic ignition pellet. Figure 5 shows a sequence of a method according to the object. DETAILED DESCRIPTION OF THE INVENTION The figure shows a pyrotechnic ignition pellet 2 in a side view. The pyrotechnic ignition pellet 2 has a housing 4 and a connector housing 6. Terminal contacts 8 extend from the housing 4 and the connector housing 6. A pyrotechnic ignition charge is enclosed in the housing 4. The connector housing 6 accommodates the terminal contacts 8 extending from the housing 4 and guides them outwards, as shown in more detail in Figure 1b. In Figure 1b, the housing 4 is shown in a cross-sectional view. The housing 4 comprises a two-layer cover formed by an outer insulating layer 4a and an inner metal layer 4b. Inside the cover 4a, 4b is an ignition charge 10, which may also consist of an ignition charge 10a and a propellant charge 10b. The metal layer 4b of the cover 4a, 4b is circumferentially welded to a ring 12. The ring 12 receives a glass sleeve 14. Two terminal contacts 8, parallel to each other, are guided within the glass sleeve 14. To manufacture the housing 4 that includes the ignition charge 10, a ring 12 is first fitted with a glass pellet. The terminal contacts 8 are pushed through the glass pellet. The glass of the glass pellet melts and fits against the terminal contacts 8 within the ring 12, forming a gas-tight connection. Inside the housing 4, the terminal contacts 8 are electrically short-circuited to each other via an ignition wire. The ignition wire passes through the ignition charge 10, specifically ignition charge 10a. The cover 4a, 4b is placed over the ignition charge 10, initially with the metal layer 4b in place. The metal layer 4b is then circumferentially welded, for example by laser, to the ring 12. Subsequently, the insulating layer 4a is placed, and the connector housing 6 is overmolded around the bare lighter. The lighter is now ready for use. The ignition charge 10 is hermetically sealed by the cover 4b and the glass cap 14, thus protecting it from gases and / or moisture. For later use, a connector housing 6 is molded onto housing 4, for example by injection molding. In Figure Ib, it can be seen that the terminal contacts 8 run parallel to each other inside the glass cap 14. On the side of the glass cap 14 opposite the ignition load 10, the terminal contacts 8 are bent, but again run parallel to each other outside the connector housing 6. Figures 2a, b show essentially the same elements, although the housing of connector 6, as shown in figure 2b, is provided with an O-ring 6a to allow it to be inserted into a moisture-tight plug if required. In contrast to figure 2a, in figure 2b the bending of the terminal contacts 8 is discontinuous, so that the terminal contacts 8 diverge in a V-shaped angular Qfrzznn / zznz / E / YiAi. The ignition module 2 is attached to the terminal contact 8 before or after the connector housing 6 has been injection molded. In this process, the terminal contacts 8 can be attached directly onto the glass sleeve 14 using pliers. Subsequently, pressing tools can press the end regions of the terminal contacts 8 that are outside the connector housing 6 into the finished product to form cross-sectional profiles as shown in Figures 3a, b. Figure 3a shows the cross-sectional profile of the terminal contacts 8 within the glass sleeve 14. It can be seen that the terminal contacts 8 are round. This results in particular from the use of connecting wires for the terminal contacts 8. By pressing, the terminal contacts 8 are brought to an angular cross-sectional profile outside the connector housing, as shown in Figure 3b. It can be seen that two opposite lateral edges 8a run parallel to each other. The short edges can also run parallel to each other, but they can also be convex. In Figure 3b, it can be seen that the terminal contacts 8 have a certain ovality in their cross-sectional profile, which should also be understood as angular in relation to the object. Figure 4 shows the ignition module 2 in one view. It can be seen that the terminal contacts 8 are formed as flat parts outside the connector housing 6. This is done by pressing the terminal contacts 8 with the help of pressing tools. Figure 5 shows the sequence of a method according to the object. First, an ignition pellet 2 (20) is made available. Next (22), the ignition pellet 2 is secured with gripping arms, for example, by fixing the terminal contacts 8 directly to the outlet of the glass cap 14. After fixing the terminal contacts, an end section of the respective terminal contacts 8 is pressed (24) with a pressing tool. The pressing tool may have lateral limiting slides so that the terminal contacts 8 have a defined width after pressing. After step 24 or before step 24, the terminal contacts 8 can be flexed outwards in step 26, as shown in Figures 1b and 2b. Subsequently, an injection molding of a connector housing 6 can be performed in step 28. List of reference symbols 2 Shots 4 Housing 6 Connector housing 8 Terminal contacts 10 Ignition charge 12 Ring 14 Glass cap 16 Ignition cable 20 Arrangement 22 Fixing 24 Crimping 26 Diffuse 28 Overmolding

Claims

1. A pyrotechnic ignition pellet (2) comprising: - a housing (4), - an ignition charge (10) housed in the housing (4), - at least two terminal contacts (8) connected to the ignition charge (10), - wherein the terminal contacts (8) are guided out of the housing (4) through at least one glass sleeve (14), characterized in that: the terminal contacts in the region of the ignition charge (10) have a round cross-section profile and the terminal contacts (8) outside the housing (4) have an angular cross-section profile such that the terminal contacts (8) with the angular cross-section profile are adapted for connector geometries that are designed for angular connection terminals.

2. The pyrotechnic ignition pellet (2) according to claim 1, further characterized in that the terminal contacts are formed from round wires and are plastically deformed outside the housing (4).

3. The pyrotechnic ignition pellet (2) according to claim 1 or 2, further characterized in that the terminal contacts (8) have a first contact distance in the area of ​​the glass cap (14) and a second contact distance outside the housing (4) which is greater than the first.

4. The pyrotechnic ignition pellet (2) according to any of the preceding claims, further characterized in that the terminal contacts (8) in the glass sleeve (14) run straight and parallel to each other and run at an angle to each other outside the glass sleeve (14) in a central section and run parallel to each other in an end section.

5. The pyrotechnic ignition pellet (2) according to any of the preceding claims, further characterized in that the terminal contacts (8) are guided through two glass sleeves (14) facing each other.

6. The pyrotechnic ignition pellet (2) according to any of the preceding claims, further characterized in that the terminal contacts (8) outside the glass cap (14) are bent opposite each other.

7. The pyrotechnic ignition pellet (2) according to claim 6, further characterized in that the fold begins at a distance of at least the radius of the terminal contact (8) of the glass cap (14).

8. The pyrotechnic ignition pellet (2) according to any of the preceding claims, further characterized in that the glass cap (14) has a glass pellet and a support ring (12), a housing cover (4) is disposed on the support ring (12) in a material joint, and the ignition charge (10) is disposed inside the cover.

9. The pyrotechnic ignition pellet (2) according to any of the preceding claims, further characterized in that the terminal contacts (8) are guided in a connector housing (6) on the side of the glass cap (14) opposite the ignition charge (10).

10. The pyrotechnic ignition pellet (2) according to any of the preceding claims, further characterized in that the connector housing (6) is made of plastic, in particular injection molded, and / or the terminal contacts (8) are folded inside the connector housing (6).

11. The pyrotechnic ignition pellet (2) according to claim 9 or 10, further characterized in that the connector housing (6) is formed on the support ring (12) and the glass cap.

12. The pyrotechnic ignition pellet (2) according to any of the preceding claims, further characterized in that the angular cross-section profile is formed by two longitudinal edges running parallel to each other and two transverse edges opposite each other, the transverse edges being configured in the shape of an arc, in particular in the shape of a convex arc.

13. A method for manufacturing a pyrotechnic ignition pellet (2) characterized in that it includes the steps of: - firstly, providing (20) an ignition pellet housed in a casing (4) with at least two terminal contacts guided out of the casing through a glass sleeve, - subsequently, mechanically fixing (22) the ignition pellet (2), and - then, mechanically shaping (24) the terminal contacts (8) outside the casing (4) such that the terminal contacts outside the casing (4) acquire an angular cross-section profile.

14. The method according to claim 13, further characterized in that the forming (24) is carried out by pressing.

15. The method according to claim 13 or 14, further characterized in that the terminal contacts (8) are bent out of the housing (4).

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