Li- Poly
08-07-2003, 02:07 PM
#51
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Mr Cork's argument could be understood.
when you connect cells in series,the overall voltage will be double or triple higher than single cell so that the heat generation of cells will be much higher as a pack.It should be awared.kokam new 1500HD also works very well at 8c-10c as a single cell but if you connect in series,the load to each cell will generate heat.Therefore we recommend 6-7c continuous instead of 8-10.
when you connect cells in series,the overall voltage will be double or triple higher than single cell so that the heat generation of cells will be much higher as a pack.It should be awared.kokam new 1500HD also works very well at 8c-10c as a single cell but if you connect in series,the load to each cell will generate heat.Therefore we recommend 6-7c continuous instead of 8-10.
08-08-2003, 07:29 AM
#53
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specially anode of out side pack area will be hot and stuck current and it will cause the heat of pack.anyhow high discharge lipo is just starting point since last summer.obiously it is good solution for e-flight and other application.kokam and e-tec shall make better and better battery packs for these area.
08-08-2003, 10:22 PM
#54
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Mr. Hong do you have advice you could give us on temperature limits on lipo cells while being used at high current discharges?
Is there a temperature where the cells will begin to degrade from too much heat?
Thanks
Is there a temperature where the cells will begin to degrade from too much heat?
Thanks
08-12-2003, 07:45 AM
#55
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Dear Cork,
inside the battery there are 3 major elements
-electrolyte
-separater film
-electrode
electrolyte will be evaporized from 90-100 degree C.
separater will be shut down from 120 degree C
Electrode shall not be heated over 150 degree C.
GENERALLY If the battery is exposed 80 degree c for more than one hour,the capacity will be droped 10%.
for Rc application 60 degree C for 30 minute will not harm to the battery.
inside the battery there are 3 major elements
-electrolyte
-separater film
-electrode
electrolyte will be evaporized from 90-100 degree C.
separater will be shut down from 120 degree C
Electrode shall not be heated over 150 degree C.
GENERALLY If the battery is exposed 80 degree c for more than one hour,the capacity will be droped 10%.
for Rc application 60 degree C for 30 minute will not harm to the battery.
08-19-2003, 11:46 PM
#56
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New Kikam 1500HD cell
[QUOTE]Originally posted by JJ HONG
[B]--------------------------------------------------
new kokam 1500HD cell handle 9Amp constant and 15Amp burst for 10 sec.kokam 12ooHD /6Amp draw constant,9A burst.
Who is selling the new 1500HD cell?
[B]--------------------------------------------------
new kokam 1500HD cell handle 9Amp constant and 15Amp burst for 10 sec.kokam 12ooHD /6Amp draw constant,9A burst.
Who is selling the new 1500HD cell?
08-20-2003, 02:27 AM
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JJ HONG my 1020's are doing fine as we discussed before some time ago I'm the one that run heatsinks between the cells at 10-12c burst and 5-6 c steady now about 70cycles on them. but the
new 1200 are good but still some heat But getting power out isn't
the problen even on the 1020's jut heat if i feel it warm it too hot. Take care. CU
new 1200 are good but still some heat But getting power out isn't
the problen even on the 1020's jut heat if i feel it warm it too hot. Take care. CU
