Note: Descriptions are shown in the official language in which they were submitted.
Oct.l6. 2000 4:27PM CA 02329327 2000-io-i9 Ido.0225 P. 2
'.'aR. '9 8 P 15 4 6
Alum3tlum Electrolyte Capacitor
The invention relates tv an aluminum olovtrolyte capacitor,
particularly for application in rapar_iter batteries, which is
installed in a housing that is provided with cooling ribs.
DE 92 03 739 U1 teaches a housing for electrical capacitors
which consists of plastic, with axial longitudinal ribs
disposed at the housing exterior to improve the heat
dissipation.
In l.he operation of aluminum electrolyte capacitors with
superposed a.c. voltage, a eubdtantial power loan occurs in
the form of h~at by teasers of the relatively high equivalent
series resistance of this component.. Thi A m~»xY ha dissipated
via the housing, whereby the housings of aluminum elecs,roly>re
capaci>rori~ have hitherto consisted of cyliiW~lc;al aluminum
cups that are produced as impact-extrur~ion parts with smooth
wall~. Shrink tubes or plastic cups are typically plea~d on
the aluminum cup as electrical inpulation, with the result
that thp hRat: dissipation ie improved compared to blank
housings. To further improve the heaL~-die~sipation, the
capacitor is mounted U!1 C:UU1111cJ. bWGLa r~r cooling bodies
and/or is air-blasted. This results in additional outlay for
cooling bodies and fixing material. When several electrolyte
capacitors are mounted together in series or parallel circuits
(what are known as capacitor batteries), substantial coezs are
again incurred for the =wyuirCd c;xiar~r~i~.
Heaauee of the high additional costs, the advantage of a
hie~her loading aapaeity based on forced cooling using cooling
bodies has usually noz been exploited. Rather, the circuit
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Received Oct-16-00 Od:l3pm From- To-Smart 8 Biaaar Page 002
Oct.l6. 2000 4~27PM CA 02329327 2000-io-i9 Pda.0225 P. 0
i
C;e~ign ha~ usually been ba:ed on a presumption of natural
tovZimg - ~vi~ in any cdr~e, air cooling.
It i~ the object of the pr~~ent invention to further develop a
capacitor of the type mentioned above such that heat can be
r.7ir~pipat.ed effectively given low production and assembly
cost .
This object is inventively achieved in that the housing is
conratructcd as an aluminum casting.
This achiRVpe rnP ahvantagp that, on one hand, housings of
this type can be produced cost-effectively and are
particularly well-suited to the wiring in capacitr~r bal,l.ot~iar~.
it being pos~ible to realize not only the cooling ribs but
also the gr~ater wall thickneeees that are n~ceaeary for
reducing heat resistance iz~ the radial directioa.
seeides the aforementioned plastic housings triat have cool~.ng
ribs, which are less euite~ble for~electrolyte capacitors,
metallic houeitzga having reeling ribo arc also lcnowa, though
these consist of thin ah~et with cooling ribs that are
shrunken on or welded in place (DE-A-A6509). T'h9~ ~ppa.rate
processing step of shrinking or welding cooling ribs raises
the coats of mamu,Caci:uring such housings substantially, and
containers of thin sheet also comprise a higher heat
resistance in the radial direction than this iz~ the inventive
capacitor having an aluminum casting. jpiE~
Advantageous developments of the subject matter of the
invention are laid out iu the su?st;lr~~.ma,
The invention will now be detailed with reference to
exemplifying embodiments.
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Oct.l6. 2000 4:27FM CA 02329327 2000-io-i9 ~ No.O225 P. 4
Shown are:
Fig. l: a capacitor hou~ing consisting of an aluminum casting;
Ficd. 2: an embodiment having a multiple housing; and
Fig. 3 and Fig. 4: circ:uiLe3 with a. »LripliuC.
Fig. 1 shows a housing 1 for an aluminum electrolyte capacitor
which consists of an aluminum casting having cooling ribo 2
formed thereon. At the tloor of the housing 1 there ie a
spindle 3 that serves to center the capacitor element.
Radially arranged ribs 4 are also disposed at the floor of the
housing 1, which cervc fer fixing the capacitor clcmcnt is a
vibrastabl~ manner. Th~ heat flow out of the capacitor ~1~m~nt
ocrur~e primarl 1y vi a t:hp prat rub i ng aathodp a.nd. the cup ,
bottom, and accordingly the cooling ribs only achieve their
full effect given low heat resistance along the cup wall. The
housing 1 is constructed flat at two opposite sides, which
creates the possibility of arranging a plurality of capacit:or~
housineds next to cne anothQr as reprapented in Fig. 2 po ap to
conaervp ~par.P _
Ac:c;vraing t~ Fig. Z, the individual housings are loeaLed
within as outer housing 7, thereby guaranteeing s particularly
simple assembly of the multiple housing 7. The individual
haur~ings 1 are arranged With their flat sides 5,6 against one
another.
Fig. 3 shown the parallel Circuit of capacitor elements e, 9,
10,..., which are installed in a housing as represented in Fig.
2. The connection is accomplis~hod by a :tripling 11, which is
constructed ae a simple "aandwi.n'h~~ . An i nsul a.tion 13 ig
located between the two electrodes 12 arid 14. An additional
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_, .. Received .Oct-16-D0 Od:l3pm From- To-Smart ~ Bi~aar PaQA ~Od
Oct.l6. 2000 4~27PM CA 02329327 2000-io-i9 No.0226 P. 6
insulation 15 is disposed beneath ttie electrode lg. The
electxodca 12, 14 arc connocted to the anode terminal lugs 1G
and the cathode terminal lugt3 17, rc~pcctivcly.
Rig. 4 t~how~ a further embodiment of a stripling 11 having a
Coaxial structure. Fig. 4 includes the same reference
characters as Fig. 3.
It ie also pos~ible to lead the negative pole via the houcting
1 - i.e. via the terminating ahe~t - and to connect th~
positive pole externally.
It is also possible to insert am izisulxLlnr~ c; up ~t~aae yr
plaptic (dccp draw part) into the metal housing 1 or to coat
the inner wall with an insulating material (e. g. rubber
coating)_
Il, 1r~ alr~o pvsr~ible to perform the connection of the coil
internally via aluminum metal strips or externally (e.g. via
copper ~heete).
Tt is also possible to arrange the cooling ribs not only
axially but radially anB/or at the bozzom o~ the cup as well.
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_ Received _ Oct-16-00__Od:l3pm .From- To-Smart & RIQQar Paso 005
