DE1596269A1 - Electric accumulator - Google Patents

Description

HÖGER - LEGAL RIGHTS - GRIESSBACH - HAECKER

A 35 142 h
h - ta
U 12.55

O.S. Ser.No. 518.219

Texan Instruments Incorporated, Dallas, Texas, USA

Electric accumulator

The invention relates to electrical cells and im special on sealed energy cells, such as Batteries, accumulators, fuel cells and the in which a negative and positive electrodes are

The electrode assembly pointing towards the container is arranged and the \ fluroh a lid is closed, which has a device, which aich at a predetermined overpressure inside opened the container to vent gas

Sealed electrical energy lines, such as batteries, accumulators, fuel cells and the like *

1098U / 02B7 ~ * ~ _8AD

A 55 142 h 159R269

h - ta

14.12.66 - 2 -

generate oxygen at the cathode and consume oxygen at the anode. A specific example provides the Niokel cadmium accumulator. The amount of production per unit of time under normal conditions is such that the accumulator is under pressure at equilibrium works below about 7.03 kg / cm, for example, waa is a safe limit. Under certain loading · »and unloading conditions and especially with very high loading» flow (if these currents are greater than is necessary for a charge within five hours to give just one example) the pressure increases beyond this safe limit. Such accumulators therefore require a safety device. So far this has been done by using a safety membrane was punctured at a certain overpressure. However, this is not desirable because it causes the accumulator after the Puncturing becomes incapacitated.

The invention is based, inter alia, on a construction to create, with the help of which an electrical energy source can be vented to the atmosphere, if the internal pressure exceeds a predetermined value, without the cell becoming ineffective in its work, or * being able to no longer work ο this task becomes

~ ■■ 3 ■ «·

1098U / 0287 ^{BAD of}

a 55 142 h 159B269

h - ta

U.12 _e 66 - 3

solved according to the invention in the aforementioned cell in that the cover has a hole that of one having a chamber with a ventilation channel The cap is covered, in which a sealing surface is provided Sealing member is arranged, which rests in a sealed manner against the edge of the hole, such that the sealing member is lifted off at a predetermined internal pressure and, after a corresponding amount of gas has flowed out, into its sealing position returns.

Such venting of the gas from the cell to the atmosphere reduces the internal pressure in the accumulator to one Reducing the safe limit value and then closing the cell again is much more advantageous than the known one Design type.

r

Further advantages and features of the invention result from the following description in connection with the drawing, which contains exemplary embodiments of the invention «. In the drawing show:

1 shows a partially sectioned front view of a cell according to the invention ₉

Pig.2 a plan view according to Fig.1, Pig.3 a partial section through the pressure release construction » tion according to the invention according to Pig.l in greater

Scale than this - 4. -

BATH ORIGINAL

1098U / 0287

H \ f ^h 159R269

12/14/66 - 4 -

Pig · 4-9 partial sections to show other embodiments the pressure release construction according to the invention

In PIg.1, 1 is a metallic container in the form a cylinder or a cup which has a sealed metallic cover 3. In the middle of A contact cap 5 is arranged on the cover. The rolled lid edge 7 of the lid 3 is rolled up on a Container edge 9 held on the upper part of container 1 »Between the lid edge 7 and the container edge 9 is a elastomeric sealing material 11 is arranged.

Inside the container 1 is a conventional electrode assembly having positive and negative plates or electrodes, which is designated as a whole by 13 ₀ This assembly can be of any known type and, for example, have a winding shape, in which the positive plates, the negative Plates and • separators arranged between these are wound up to form the electrode assembly 13. A group of plates 15 (for example the negative one) is electrically connected by a conductor 17 to the container 1 so that it is of negative polarity. The other group of plates 19 (e.g. the positive one) is via a conductor 21

8AD 1098U / 0287

ΐ.JI, ■■■ ίΠ '■' ■

h - ta

12/14/66 - 5 ~

connected to the cover 3 so that it has a positive polarity «The conductor 21 is held in firm contact with the cover 3 via a flexible spacer element 23 which is arranged between the electrode assembly 13 and the cover 3» The spacer element 23 holds the electrode assembly 13 down · The spacer can be made of any suitable elastomeric material, such as polypropylene or ethylene gumrai, hyoar, thiocol, neoprene, etc., ie of a material that is resistant to caustic and / or acid. It is advantageous if it is also somewhat resilient and, above all, has a relatively high yield point ₀

As shown in Pig.3, the cover 3 is with a Looh 25 provided, which is limited by a valve seat 27 iet · The valve seat 27 can be formed by stamping, machining or other procedural holes may be attached to the cover 3.

The contact cap 5 shown in Pig 3 is essentially cup-shaped and has a krels-shaped bottom 29, which is connected to an annular surface 31 by a peripheral wall 33. The Planaoh 31 lot with the lid 3 feet connected «The bottom part 29 of the cap 5 is immediately above the hole 25 and the valve seat 27» but in the Abetand of these, arranged to ao a chamber 35

BATH ORIGINAL

1098U / 0287

a 35 142 h 159R269

h - ta

12/14/66 - 6'-

create. In the peripheral wall 33 there is also a hole 37 which _creates a passage between the chamber 35 and the atmosphere *

Inside the chamber 35 there is arranged a cover member designated as a whole with 39. In the embodiment according to Pig. 3 the cover part is formed by a kind of spider with a plurality of legs 44 (three of these are shown) which lie against the inside of the contact cap 5 and press the spider against the hole 25 under a spring force. The spider 39 has a: cup-shaped spring member 41 made of metal, on the outer surface of which a suitable, acid-resistant, elastomeric sealing material 43 is firmly attached. This sealing material can consist of natural or synthetic rubber, Hycar _f Heoprene or the like. When the accumulator is assembled, the sealing member 39 is arranged below the contact cap 5 and the contact cap is then pressed near the bottom of the cover 3 so as to keep the legs 44 of the peder member 41 pressed together when the puddle 31 is welded to the cover 3 , Hard soldering, white soldering or otherwise firmly connected. The elastomeric sealing material 43 has a surface 45 which extends beyond the site 27 and rests against the seat ao ₉

- 7 -BAD ORIGINAL

10 98U / 0287

η - ta

U.12.66 - 7

that the hole.25 is closed. The surface 45 is already under spring tension in the sealing layer according to FIG located elastomeric material pressed against the contact cap 5 with support »The arched legs result also a spring force «The surface 45 can be moved away from the seat 27 by pressure from the inside of the container 1, with the pressure being directed against the surface 45

The strength of the spring member 41 can be selected so that the surface 45 is fixed against the seat 27 for as long is kept sealed until a predetermined value of a flow medium pressure is reached within the container 1 * If this pressure is exceeded, the sealing part moves upwards according to FIG. 3, around the surface 45 to separate from the seat 27, so that now in the container 1 pressurized gas flow through hole 25 into chamber 55 and from there to atmosphere through hole 37 can. After enough gas from the container 1 to reduce the pressure below the predetermined, for lifting The amount required has flowed off the surface 45, the spring member 41 automatically closes the hole 25 again for the Durohgang of the gas by, the surface 45 against

BAD ORIGINAL 10981 A / 0287

A 35 142 h h - ta 14.12.66

the valve seat 27 is pressed. A He tiUften the cell, due to a high pressure übennäasig so not a Unwirksammaehen gives the same, ^ ^e w it! was with the previous designs of the Pail, T ^ ei Denevi a membrane at a given pressure within country \ cell Wnictiert was * The elastic form of Abdichtg ^ Every 39 \ allows for venting of the accumulator any \ times dih. as often as this is necessary, whereupon it automatically closes again every time without damaging the cell as a result of excessive excessively high pressure, without the cell constantly remaining open to the atmosphere! after this

1 \

the pressure again to a satisfactory or safe value

sunk isto

The formation of the Abdichtgliedes 39 \ erhfeblioh ₉ may be modified according to the effect ker invention £ iu reach "According to Figure 4, for example, a cup-shaped spring member 47 are used, the legs .48 and / 'Püsse 49 has the lie ο MSEE 49, against the base part 29 of the contact cap in order to pretension the peder link 47 against the valve seat 2: 27. A layer 51 of sealing material (an elastomer resistant to acid and caustic agents) is firmly bonded to the lower surface of the spring member 47. _{A sealing surface 53 of the layer 5I 9} extends across the hole 25 of the cover 3 in a sealing manner

1098U / 0287

A 35 1 * 2 h

h - ta

14-12.66 - 9 -

against the valve seat 27 surrounding the hole. As in FIG. 5, the sealing surface is under spring tension in Touching the seat so that an automatisobes opening of the seal in the case of excessively high bridges in the Accumulator and an automatic leather closing of the Accumulator takes place when the pressure is reduced again to a predetermined safe value,

5 shows a further embodiment of the seal to open and close the hole 25 · Xin this case the sealing part is a sealing block made of elastomer and resistant to acids and caustic agents, which is loosely arranged within the contact cap 5 or on attached to the inner surface of the bottom 29 of the contact cap The sealing block 55 is compressible and has a sealing surface 57 which rests against the seat 27 for the sole purpose of the connection between the interior of the container 1 and the chamber 35. The sealing block 55 is compressed between the cap 5 and the valve seat 27 in such a way that the surface 57 rests under tension against the seat 27 under the spring force of the cover block 55. The material used for the cover sheet 55 is selected and the block eo shaped so that the surface 57 is pushed away from the seat 27 when the pressure in the container 1 reaches a predetermined value, at which the container 1 is then released into the atmosphere through the hole 25 in the lid 3 and dae Looh

- 10 -

BATH ORIGINAL 109814/0287

h - ta

H.12.66 τ 10 -

is vented in the contact cap 5 «,

In the embodiment of the invention according to FIG the sealing member is denoted by 59 and has a Abdicfatfläehe 61 which rests against the seat 27. The sealing member 59 is similar to the Abdiohtblook 55 in the one previously described Embodiment only with the difference that it has a different shape than the sealing part 59 is essentially frustoconical, while the sealing part 55 is cylindrical "

In the above description, the chamber 35 has been through βφη provided in the contact cap 5 hole 37 into the atmosphere vented. The hole can, however, be omitted * if the flange 31 of the contact cap is attached to the cover 3 in this way attached that the Sas located in the chamber 35 between the flange 31 and the cover 3 ic escape the atmosphere can. This has been exaggerated in »MaSatab in Fig.7 shown where a passage 63 between the flange 31 of the contact cap 5 and the cover 3 is provided. This The passage can be created by embossing one or more notches on the underside of the flange 31. This embossing can also be done on the cover 3 below the flange 31 can be made. Another possibility would be to create Durohganges that the flange

OR _{! GINAL} 1098U / 0287

A 35 14-2 h

h - ta

12/14/66 - 11 -

31 with the cover 3 on at a distance from each other Make is connected so that is in between result in unconnected places through which gas can escape into the atmosphere under high pressure «,

In the embodiments using spring members 41 and 47, the spring members are advantageously designed so that they can be calibrated so as to achieve venting at a pressure that is compatible with the safe operation of the energy cell. If the cell considerable temperature changes is subjected, the sealing member may be formed so that it compensates for these temperature changes · Pig.8 shows a temperature compensating sealing member having a bimetallic strip 65 has _s having a first metal layer 67, which is connected to a second metal layer 69 is. On the lower surface of the strip 69 an elastomer layer 71 is firmly applied as described in the earlier exemplary embodiments and lies against the valve seat 27. The bimetallic strip S5 is essentially L-shaped and the elastomer layer 71 is attached to its long arm Ar » -supporting. The other short arm of the bimetal strip is made by welding, soft or hard soldering

- 12 -

BAD ORIGINAL 1098U / 0287

A 35 142 h

h - ta

12/14/66 - 12 -

firmly connected to the peripheral wall 33 of the contact cap 5 ^

If the strip 67 is made of copper or some other metal with a high coefficient of expansion and the strip 69 of Invar or another, a low coefficient of expansion containing metal is, at high working temperatures the sealing member according to FIG. 8 opened in order to release the pressure in the cell at correspondingly higher working pressures * The different Expansion coefficients of the strips 67 and 69 can be reversed if the opposite result is desired *

The sealing member 39 of the sealing member 47 of the -Big.3 and Pig.4 can also be made of bimetal and thermostatically according in the same manner as the bimetallic Abdiohtglied Fig x 8 act _o

.Fig.9 shows a further embodiment in which the the part of the cover 3 lying around the hole 25 is flat and therefore does not have a raised valve seat 27 <, In this case, the seal for the hole 25 is made by a sealing washer 73 made of an acid and etching agent Resistant elastomeric material, for example ethylene-propylene rubber, that gives a strong

- 13 -

1098 U / 0287. ^BATH

A 35 142 η h - ta 12/14/66

- 13 -

annular circumferential bead 75 bat · This circumferential bead is between the bottom part 29 of the contact cap 5 and the the part of the cover 3 surrounding the hole -25 is pressed together, the outer surface of the circumferential bead being the contact cap and the inner lip 77 of the circumferential bead the cover 3 around the hole 25 and make a seal on the lid 3 · The sealing plate and the inner lip The f / ulstes define one in communication with the hole 25 standing room 79 * The diameter of the sealing washer

ν
73 »their Compressibility and the Durohmesser the inner lip 77 are selected such _t that when exceeding the ZEI LLendruckes above a predetermined value the sealing rom cover 3 is pushed away, can be so carried out over a venting channel 63 according to figure 7 is a vent.

- 14 -

BAD ORiGiNAl

Claims (1)

A 35 142 h - 14 - December 16, 1966 Claims 1. Electric accumulator or electric cell with a container in which a sheet metal electrode assembly having negative and positive electrodes is arranged and which by a lid is closed, which has a gate direction, which opens at a predetermined overpressure inside the container to allow gas to flow out, characterized in that the lid (3) has a hole (25) through which a a chamber (35) is covered with a ventilation duct (37) having a cap (5) in which a sealing surface (45) having sealing member (39) is arranged, which abuts against the edge of the hole (27) in a sealed manner, so that the sealing member (39) is lifted off at a predetermined internal pressure and returns to its sealing position after a corresponding amount of oas has flowed out. 2. Accumulator according to claim 1, characterized in that the Abdiohtglied (39) is supported against the bottom (29) of the cap (5). 3 · Accumulator according to one of the preceding claims, characterized characterized in that the cap (5) is cup-like and has a substantially flat bottom (29) (Pig. 3) · 4 · Accumulator according to one of the preceding claims, characterized known that there is an abdominal limb (39) on at least his Abdiohtfläohe (45) is made of elastomeric material (43). - 15 -_ 109814/0287 A 35 142 h - 15 - h-4? 24 December 16, 1966 5. Accumulator according to one of the preceding claims, characterized in that the sealing member (55 ₉ 59) is made entirely of elastomeric material and is preferably block-like or frustoconical (Pig. 5 »δ). 6. Accumulator according to one of the preceding claims, characterized in that it is preferably made entirely of elastomer Sealing member (73) has a sealing ring (75) which has a central disc over which the sealing ring (75) at least protrudes from the hole (25) (Fig. 9) 7. Accumulator according to one of the preceding claims, characterized characterized in that the sealing member (39) has a spring member (41) (Pig. 3). . 8. Accumulator according to claim 7, characterized in that the peder member is a metal spring (41) which is attached to the sealing disk carries an elastomeric seal (43). 9. Accumulator according to claim 8, characterized in that the Metal spring is built in the manner of a spider (47) and has elastic legs (48) which rest against the bottom (29) of the cap (5) support (Pig. 4). 10 »Accumulator according to one of the preceding claims, characterized characterized in that the sealing member is a temperature compensation8 part (65), which bends when the temperature changes and the sealing surface on one of the temperature compensation part (65) attached elastomeric material (71) is arranged (Pig. 8). 109814/0287 - 16 - BAD ORIGIN ^At A 35 142 h - % - December 16, 1966 11. Accumulator according to claim 10, characterized in that the temperature compensation part is a bimetal part (65) (Pig. 8), 12. Accumulator according to one of the preceding claims, characterized characterized in that the ventilation duct (57) in the cap (5) is (Pig. 3). 13. Accumulator according to one of claims 1-11, characterized in that daiJ the ventilation hole (63) along the connection between cap (5) and cover (3) is (Pig. 7, 9). 1098 1 4/0287