Lithium Sulphur Cells

[vcal]

Responding to the possible need for the 3.5v Li/S cells mentioned in the Action Light thread:
-Noticed that type of cell avail.($2.50ea.) @: www.allelectronics.com -cat.#L-bat. 31 -any help?

 

[PeLu]

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by videocal:
Responding to the possible need for the 3.5v Li/S cells mentioned in the Action Light thread:
-Noticed that type of cell avail.($2.50ea.) <HR></BLOCKQUOTE>

For the case somebody is not familiar with (large) Li primary cells:

There are several different kinds:
LiSO2 (what some people here call 'Li sulphur') and
Li Thionyl Cloride (LiSOCl2).
(there are also LiMnO2, this is the most common 123 cell)

The first ones have 3.6V nominal voltage, the second one 3.0V.
And there are also mechanically different ones:
spiral wound and bobbin. Spiral wound cells have very high capacities, but are only for very, very low loads. With the bobbins it's the opposite.

I know several people who bought Li cells at surplus stores or at hamfeasts and where very disappointed to get a D cell which only can deliver some 300mA (at greatly reduced capacity).

 

[Silviron]

Yeah, unfortunately the ones at All Electronics are 3V models, not 3.6V---
Saft apparently doesn't even make that particular battery anymore

 

[vcal]

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Silviron:
Yeah, unfortunately the ones at All Electronics are 3V models, not 3.6V---
Saft apparently doesn't even make that particular battery anymore<HR></BLOCKQUOTE>

I thought they listed that cell @ 3.5v (#L-31bat)?

 

[Silviron]

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by videocal:
I thought they listed that cell @ 3.5v (#L-31bat)?

<HR></BLOCKQUOTE>

You were looking at the Amp/Hour rating..
(Which is pretty impressive for a C cell size package...)

 

[The_LED_Museum]

The one in the Action Light is a 3.0 volt cell, Saft model L026SX, part #37260146

Pictures please... *snap* *snap*

The battery is really *white*, not yellow - no thanks to the compact fluorescent desk lamp above my computer.

 

[**DONOTDELETE**]

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by PeLu:
For the case somebody is not familiar with (large) Li primary cells:

There are several different kinds:
LiSO2 (what some people here call 'Li sulphur') and
Li Thionyl Cloride (LiSOCl2).
(there are also LiMnO2, this is the most common 123 cell)

The first ones have 3.6V nominal voltage, the second one 3.0V.
And there are also mechanically different ones:
spiral wound and bobbin. Spiral wound cells have very high capacities, but are only for very, very low loads. With the bobbins it's the opposite.

I know several people who bought Li cells at surplus stores or at hamfeasts and where very disappointed to get a D cell which only can deliver some 300mA (at greatly reduced capacity).<HR></BLOCKQUOTE>
I think you got your lithium battery types backwards:

Lithium Sulpher batteries, LiSO2, output 3.0V and are usually spiral wound, resulting in the ability to drive heavy loads. But they can literally explode if they develop and internal short. The military is the biggest user of these cells.

Lithium Thionyl Chloride batteries, LiSOCL2, output 3.6V, and are almost always bobbin wound, resulting in very high capacities, but they cannot drive medium or large loads. The capacity of a D size Lithium Thionyl Chloride battery can be a high as 19 amp-hours. This is nearly the capacity of a small car battery. BUT such a cell can only drive a few tens of milliamps at best into a load. Also when a Lithium Thionyl Chloride cell is discharged to about 35% remaining capacity, its internal resistance starts to rise exponentially so after that it can only drive a few milliamps without a significant voltage drop. The biggest use of these batteries is in you computer where it backs up the CMOS BIOS RAM (in PCs) or the PRAM (in Macs).

 

[PeLu]

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Marlan:
I think you got your lithium battery types backwards:
<HR></BLOCKQUOTE>

Yes, of course, sorry. Should not write so late in the night. Thanks for the correction.

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>
Lithium Thionyl Chloride batteries, LiSOCL2, output 3.6V, and are almost always bobbin wound, resulting in very high capacities, but they cannot drive medium or large loads.
<HR></BLOCKQUOTE>

Yes, most of them. But I also have bobbin type Li Thionyl Cloride cells (LSH20) which can give pretty high currents. At least there is version available which is fused at 10A .-)
(mine are fused at 5A).

And as you probably know, this is the very same cell which was used for the Mars Rover car.

I don't have my data books at hand know, but as much as I remember their output is pretty stable for up to some 1A discharge (but capacity is highly affected by this high discharge rate).