DE2021988A1 - Closure for rechargeable electrical elements - Google Patents

Description

Puient & ^{nwaJt:: -;} ■ '"': ■■ ■ '■■■■ Dipl.-lnq.K.Ws! Ther

1 & ERUN19 29 «April 1970

Bolivarallee 9 W-w-2638

Tel. 304428S

The Ever Ready Company (Great Britain) Limited,

Ever Ready House, 1255 High Road, Whetstone, London N 20, Engl

Closure for rechargeable electric devices

The invention relates to a closure for rechargeable electrical elements

This type of electrical element includes the nickel-cadmium elements, the negative plates of which are oadmium hydroxide and their positive plates carry nickel hydroxide Charging of such elements occurs on the positive plates Oxygen, so that the pressure in the element increases. The Elements can be designed in such a way that a state of equilibrium is established with massive pressures even with weak overloading Overpressure occur »Therefore, such elements are with a

■■■ * i ^: '■■■■■ ⁸ ^ / ^: Provide ventilation to blow off oxygen if a given pressure is exceeded. «This ventilation must, however, be sealable in order to prevent further losses of oxygen or electrolyte · I

The invention is based on the object of providing an I Conclusion noauszuestalten that through the venting when lowering the pressure in the dome element, air does not enter the element can penetrate, as their carbonic acid content could damage the element

A closure is characterized according to the invention through a lid that closes a cup of the elements, which has a concave recess in the outer surface »from which extends a hole through the cover, and through a holder connected to the cover, which has a Diohtungteil a convex surface, closing the hole with such Pressure against the concave recess keeps the sealing part in the sealing part when a given gate gas pressure is exceeded the leeh releases under elastic deformation

As a precaution, the convex part of the Diohtungteil "to a frustoconical part.

In another embodiment of the invention it is envisaged that the sealing part has the shape of a sphere and the convex surface through part of its surface It is advantageous here if the ball is a fretting part formed from two parts, in its parting plane a covenant is formed

laughing a further feature of the E _r fi.ndung the sealing portion by shaping, dimensions and material is formed such that it is compressible deformable in compression and releasing a path for the effluent of the grass, and directly previous upon pressure relief in his, the way for the Gas sealing form returns

In two dimensions, the diohting part consists of a counter Alkali-resistant material "

Hash a feature of the E _r-making is the sealing portion of Meopren "Torteilhaft it consists of a

009887/1313 ^ _3-

Fe-free modified neoprene with additives such as antioxidants, plasticizers, lubricants and hardeners.

According to another feature of the invention, the confesses Sealing part made of ethylene propylene rubber, Butyl-Guinmi, Thiokol or polyurethanes.

It is also provided that the holder with the Lid is connected gas-tight. Instead or in addition the holder may include a gate outlet.

In the case of a closure for an electrical element with a cup open on one side with an annular flange on the open end and inserted positive and negative plates is provided that the lid below the annular flange is supported against the cup via a gas-tight seal. It is useful if the holder for the sealing part with the positive plates and the cup are connected to the negative plates of the electrical element, and these both poles of the element through the seal between the The lid and the cup are electrically insulated from one another

Exemplary embodiments of the invention are shown in the drawing. I _n the drawing is

Figo 1 is a partially sectioned Seitenansiclit an electrical element with a closure according to the invention E _r,

2 shows a partial section through another embodiment of the sealing part.

009887/1313

The nickel-gadmium element shown in Figure 1 contains positive and negative plates 10 contained in a sealed container consisting of a cup 11 is formed from nickel-plated steel and a lid 12 made of steel, with a « Usual gas-tight seal 13 is provided * The lid is connected by electrically conductive strips 17 to the pnitive plates, while the cup by not shown electrical connections connected to the negative plates

The ring-shaped seal 13 consists of an electrically insulating material, e.g., _# Xyb'on, and separates the electrical poles of the element formed from one another at the top against an annular flange 15, which is flanged radially inward after the cover 12 has been inserted.To improve the seal, the seal 13 can be covered with a filler, e.g. with bitumen applied before assembly.

As already mentioned, when the element is charged, oxygen is formed on the positive plates and around one To prevent the pressure in the cup from rising above a predetermined value, ventilation is provided, which according to the invention is designed so that it closes immediately after the oxygen has been released to prevent further losses To prevent oxygen or electrolyte from entering

0098 87/1313 -5-

Exclude air that contains carbonic acid that is harmful to the element

For this purpose, the lid.12 contains a hole 20, which is of a concave recess 19 in the upper surface of the dome goes out o This recess forms a valve seat for a

23 / convex surface 25 on a sealing part / made of an elastic deformable material that closes the hole 20. The sealing part 23 is covered by a cup-like holder 21, which is connected to the upper surface of the cover 12, for example by spot welding. In the exemplary embodiment, contains the holder 21 additionally has a gas outlet opening 22 · the height of the holder 21 is matched to the Diohtungteil 23 that the latter against the concave surface of the recess 19 below Pressure is maintained and secured against evasion " When a predetermined gas pressure is exceeded in the cup 11 j deforms the sealing part to in the area of the recess> 19 to open up a path for the gas which is immediately closed again tightly when the outflow of the gas is stopped »This j opening of the hole 20 thus takes place without lifting the sealing part 23 as a whole · It was found that through this; Training the repositioning of the hole 20 quickly and takes place reliably, so that carbon dioxide cannot get into the cup with the outside air via the holder 21 into the open. With a gas-tight connection of the holder 21 to the cover 12, this can be achieved solely by the Gas outlet opening 22 takes place, but this can be dispensed with if the holder 21 is not connected to the cover 12 in a gas-tight manner

00 9 887/1313 *

will. ,

In the embodiment according to Fig. 1, the » tungsten 23 with a flat surface against the holder 21 and next to this has a cylindrical part 26 · This merges into a frustoconical part 27, to which rounded part 28 connects to which the convex surface is formed against the concave recess 19 of the cover 12 is present «

In the modified design according to FIG. 2, the sealing part has the shape of a ball 23 which is clamped between the holder 21 and the concave recess 19. This ball 23a has a collar 24 extending over a large circle. If the ball is made from two parts as a pressed part, the B _n Ud 24 is located in the area of the parting plane so that the burr on the parting surface cannot get into the area of the concave recess 19 Trap formed by part of the surface of the ball 23a

When selecting the material for the sealing element 23 or 23a, the value of the pressure must first be taken into account at which the vent is supposed to release gas · This results in the shape, dimensions and type of material to be used to obtain the required deformation of the sealing part at this pressure. This deformation is to be determined in such a way that when the pressure is relieved, the deformation back to the original shape takes place quickly

-7- 00 98 87 / 13Ϊ3

The material used for the sealing part should also be insensitive to alkalis so that it cannot be damaged by the electrolyte of the element · is heoprene particularly suitable for this purpose

A preferred leopren is a sohwefelfreies modified neoprene, the various desired additives can be mixed to obtain the following properties t

Hardness 52 ° I.R.H.

Tensile strength 171 kg / cm ²

• Modulus of elasticity "

at 30OJtB 63 kg / **

Elongation at break 650 J *

permanent deformation

at 70 0 17.4 J ^

Toralons medul at -20 ⁰ O _{4th QK}

————--—: - τ- ^β J «S5 .- ■■ - .. -

Torsional modulus at +20 G

The additives contain antioxidants, plasticizers, Lubricants and hardeners. The sealing parts are made such a material under pressure and heat. during a pressed for a certain time "

Other materials can also be used for the sealing parts, such as «.Β, ethylene-propylene rubber, butyl rubber, Thiokol odee polyurethanes, which are produced in a corresponding manner are to be set to the desired properties.

The sealing parts are simple to manufacture, that is to say cheap _/ and easy to assemble. They work in a reliable way and thus help the electrical element to have a longer service life.

009 8 87/13 1 3 -8-

Claims (1)

Patent claims: \ 1 · ^ / Closure for such as the rechargeable electrical elements, marked by a cup (11) of the elements closing cover (12), which is in the A concave recess (19) has a concave recess (19) from the A hole (20) extends through the lid, and a holder (21) connected to the lid, which is a sealing part (23) with a convex surface (25), closing the hole with such a pressure against the concave recess that holds at Exceeding a predetermined gas pressure in the cup, the sealing part releases the hole with elastic deformation. 2. Closure according to claim 1, characterized in that the convex * part (25) of the sealing part (23) adjoins a k "& elstuap £ -shaped part (27)" 3 · Closure according to claim 1, characterized in ^ that the sealing part has the shape of a ball (23a) and the convex surface (25) is formed by part of its surface. 4 Closure according to claim 3, characterized in that that the ball (23a) is a free part formed from two parts is, in whose parting plane a collar (24) is formed 5. Closure according to one of the preceding claims, characterized in that the sealing part (23) is designed according to shape, dimensions and material so that it is compressible deformable under pressure and opens a path to the outflow of the gas, and upon pressure relief 0 0 9 8 8 7/1313 _ _g immediately in its previous one, sealing the way for the gas Shape returns. ' 6. Closure according to one of the preceding claims, characterized in that the sealing part (23) consists of a consists of a material resistant to alkalis *, 7 β closure according to claim 6, characterized! that the sealing part (23) is made of neoprene » 8. Closure according to claim 7 »characterized in that that the material for the sealing part (23) is sulfur-free, it modified leopren with additives, such as antioxidants; materials, plasticizers, lubricants and hardeners is ": 9. Closure according to claim 6, characterized in that the sealing part (23) made of ethylene-propylene-oil, butyl * · .j; Rubber, thiokol or polyurethanes; consists » ³ I 10. Closure according to one of the preceding claims, characterized in that the holder (21) with the Deekel (12) the connection is gas-tight, 11 Closure according to one of the preceding claims * before, characterized in that the holder (21) contains a gas outlet opening (22) · i 12 »Closure according to one of the preceding claims before for an electrical element with a one-sided open Cup and a Rjtngflansoh at the open end and inserted positive and negative plates, characterized in that • the cover (12) below the ring flange (15) against the Cup (11) is supported by a gas-tight seal (13) 0098 87/1313 - ίο - 13. Closure according to claim 12, characterized in that the holder (21) for the sealing part (23) is electrically connected to the positive plates and the cup (11) is connected to the negative plates of the element, and these two P ₀ Ie des Elements are electrically isolated from each other by the seal (13) between the lid (12) and the cup (11) 009887/1313