DE3520851A1 - DISASSEMBLABLE GAS AND LIQUID-TIGHT POLD COUPLING FOR A GALVANIC CELL OR BATTERY - Google Patents

Description

::! :: Γ :: .3520851 Deutsche AutomobilgeseH-sciTaft -mbH · - ^

Stuttgart EPT Dr. Am-wa

May 28, 1985

Detachable, gas- and liquid-tight pole bushing for a galvanic Cell or battery

The subject of the invention is a gas- and liquid-tight Pole lead-through for a galvanic cell or battery. Gas-tight, pressure-proof current ducts are always required where an electrical conductor has to be passed through a metallic wall and the wall is exposed to a large pressure difference. In particular, such current feedthroughs for Cell from maintenance-free rechargeable nickel-gadmium batteries or hydrogen cells, e.g. nickel-hydrogen cells. In such cells the active cells are parts enclosed by a tight metal housing in which hydrogen gas is under a pressure of up to 50 bar. Since the life of such cells is said to be several years, the electrical feedthroughs must be extremely have a low leak rate.

In general, a power feedthrough consists of an outer metallic sleeve that is hermetically sealed to the container is connected., an inner metallic conductor that connects the Electricity transport causes and one between the sleeve and the conductor

EPT Dr Am-wa

located insulating material, so a pole bushing is described in DE-OS 28 49 326, in which the gap between the wall of the battery housing or a neck of the battery housing and the pole bolt is filled with an insulating material, which is provided by two external disks in the manner of a stuffing box packing is compressed in the gap and so the seal due to the radial forces induced in it causes. The main disadvantage of this type of seal is that, due to the high radial forces, a simpler necking in a thinner sheet metal housing does not have the required strength, so either larger material thicknesses or welded, reinforced Metal sleeves must be used.

The object of the invention is therefore to provide a pole bushing to find that is easy to assemble, even with only a small wall thickness of the cell housing no reinforcements are required in the area of the pole lead-through and a secure centering of the pole bolt guaranteed in the implementation.

This object is achieved by the pole leadthrough described in the claims.

The cell housing is provided with a neck and the space between the neck and the inserted one Pole bolt is made of tight Material sealed. The roid implementation also has

-Dr.Am

3 ^ 0851

two discs, one of which is e.g. "on a collar of the bolt and the other on one screwed onto the bolt Mother supports. One disc has an annular shape that positively encloses the neck on the outside Provided elevation, which once serves to support the collar against outwardly acting forces and on the other hand, the pole bolt is fixed in the opening. The other disc can be smooth, but it is preferred

that the disc is provided with a sleeve-shaped projection which penetrates into the annular gap formed by the bolt and collar and sddL from the bolt and at the collar radially supported, whereby a further improved centering of the pole bolt in the opening, as well as a improved positional fixation of the sealing ring is achieved.

The current feedthrough according to the invention is based on Drawings explained further. Show it

Figure 1 is a section through a power feedthrough

Figure 2 is a partial view of a cell in the area

the implementation and

FIG. 3 is a view with a partial longitudinal section of a complete cell.

Figure 1 shows a section from a vessel wall 1, in which the power feedthrough is embedded. The vessel wall is in the area of the pole lead-through with an inward-facing neck (Draft) 3 provided. The seal between the pole bolt and the collar is made by the pressed-in elastomer ring 5. This elastomer ring 5 is an O-ring (O-ring), which is preferably made of a low permeability against gases and liquids containing material. Vulcanized rubber, styrene

- 6 -INSPECTED

'.Ι-' · '"οόδόοό ι .Λ..BAUG 90 / ^ EPT Dr.Am-wa

Butadiene copolymers, acrylonitrile-butadiene copolymers, butyl rubber, chloroprene rubber, sulfochlorinated Polyethylene, Silocon rubber, etc. The one through the neck 3 and the pole bolt 10 formed annulus, which carries the seal 5, is on top and bottom by two the bolt 10 matching disks 6 and 7 completed. The disc 6 is with a neck provided on the outside positively enclosing elevation, on the one hand the neck on its outside and on the other hand causes the centering of the pole bolt in the implementation. It is preferred that the

Elevation includes the neck up to the container wall and can be supported on the container wall. This avoids that the disc 6 can be damaged by the neck 3, since the neck 6 when the tension is too strong Slices can act like a ring point. The disc is supported on the other side of the housing Housing. Preferably, the disc 7 is provided with a sleeve-shaped projection 12 which is in the by bolts The annular gap formed and the neck penetrates, is supported on the bolt and on the neck and thereby an improved Causes guidance and centering of the bolt in the implementation. The discs 7 and 6 are made of one electric insulating, dimensionally stable, electrolyte-resistant material - the latter especially for

, Q washer 6 required - manufactured. As dimensionally stable Material are suitable depending on the electrolyte used (acidic, alkaline or non-aqueous) for example phenol-formaldehyde resins, some polyamides, melamine resins, polyesters, polystyrenes, polysulfones, polyolefins or polyoxymethylene. The two disks 7 and 6 are axially braced by means of a nut 9 and a collar. To protect the panes 6 and 7 are between Screw 9 and washer 7 or collar 8 and washer 6 and metal washers 11

- 7 ORIGINAL! NSFECTED

- 7 - DAUG 90 / £

EPT Dr Am-wa

or 11 'arranged. Unless due to major pressure fluctuations Expect cyclical vascular expansion in the cell are, the washers 11 and 11 'are preferably designed as disc springs. It doesn't have to be special it should be pointed out that, of course, the pole bolt must no longer have a thread in the sealing area. the The collar is preferably directed inwards, as this simplifies the assembly of the sealing ring and reduces the structural height of the cell.

FIG. 2 shows a partial view of a battery cell in the area of the bushing. The domed cover for the battery cell is provided with a bulging console or bulge 2, the carries out the implementation. One recognizes the pole bolt 10, the upper washer 7 and the washer 11. The nut is provided with a cylindrical surface to protect against undefined or undesired unscrewing (loosening).

FIG. 3 shows a view with a partial longitudinal section of a complete cell. The two disks 307 and 306 become pressed against the container wall 301 by means of nut 309 and collar 308, with another one between nut 309 and washer 307 Washer 311 is arranged. The disk 306 encloses the collar 303. Between the collar 303 and the pole bolt the seal 305 is arranged. The disk 306 is designed as a sleeve and serves at its lower end at the same time the support of the end plate 312 of the cell stack 313, which is attached to the continuous pole bolt. on in this way a particularly favorable and simple fastening of the cell stack can be achieved.

OÜZ.UO ü I

"FÄUG EPT Dr.Am-wa

The achievable tightness of the implementation is excellent, the implementation is very easy to assemble and has an extremely small footprint. It is also particularly noteworthy that reinforcements of the cell housing are not required in the area of implementation.

ORIGINAL IKSFE

Claims (4)

Deutsche Automobilgesellschaft.mbH DAUG 9 Stuttgart EPT Dr. Am-wa May 28, 1985 Claims - 1. Detachable, gas- and liquid-tight pole bushing for a galvanic cell or battery, consisting of a metallic one for the power line Bolt and one located between the bolt and a neck of the battery housing is elastic deformable sealing material, furthermore with two suitably arranged above and below the cell wall on the bolt Washer made of insulating material, one of which is attached to a collar of the bolt and the other to one supported on the bolt screwed nut and together with the through the neck and the bolt formed gap form an annular space for receiving the sealing material, characterized in that the one disc with an annular, the neck on the outside positively enclosing elevation is provided and that in the gap between the two Sealing material located on washers is an O-ring sealing ring. 2. Pole bushing according to claim 1, characterized in that that the length of the collar corresponds to 0.4 to 0.8 times the bolt diameter. - "f - DAUG 9θ / ^ EPT Dr Am-wa 3. Pole bushing according to claim 1 or 2, characterized in that that the lift of the one disc surrounding the neck surrounds the neck up to the container wall. 4. pole bushing according to claim 1, characterized in that the other disc with a sleeve-shaped projection is provided, which penetrates into the annular gap formed by the bolt and collar and is located on the bolt and supported on the neck.