Embedded Systems Conference
Breaking News
Comments
Newest First | Oldest First | Threaded View
eetcowie
User Rank
Author
Re: Bootstrapping the batteries
eetcowie   7/29/2014 12:54:07 PM
NO RATINGS
"bootstrapping"


I have heard of this being done with other technologies. Another possibility, is to keep capacitors trickle charged, to quick-heat/dump, so that the bootstrapper doesn't have wear-out and chemistries issues.

eetcowie
User Rank
Author
Re: Fire
eetcowie   7/29/2014 12:48:46 PM
NO RATINGS
"...Is this a "typical behavior" for such a battery?"

No, it is rare. Whenever there are alot of anything in use, the probability of the rarities happening once, increase. Also, there probably was no mention of the 'abuse' history of the particular battery that failed.

DrQuine
User Rank
Author
Bootstrapping the batteries
DrQuine   7/23/2014 10:14:44 AM
NO RATINGS
Since the sodium must be kept molten for the battery to operate, it would seem that if the battery system is ever going to be shutdown it would benefit from a "bootstrapping" system. A small battery could be brought up first up with help from the charger system and then used to help bring up the first full size battery which would then help jump start the next battery until all the batteries were running again.

dlactir
User Rank
Author
Fire
dlactir   7/23/2014 9:54:06 AM
NO RATINGS
Thanks for this series of article! I did not know about so many chemistries!

I heard about sodium batteries which were installed in buses for the city of Quebec, Canada. A few years ago, one caught on fire and fortunately, no one got hurt. The manufacturer told city maintenance the battery was too old and needed replacement. Is this a "typical behavior" for such a battery?

eetcowie
User Rank
Author
book
eetcowie   7/18/2014 10:03:05 AM
NO RATINGS
Glad to see there is such interest in this topic. I am considering doing it, especially since I'm wanting to publish the work I did creating spice models that functioned for selected chemistries.

I should put myself down for one also, I think.

Thank you all for the encouragement.

Garcia-Lasheras
User Rank
Author
Chemistry
Garcia-Lasheras   7/18/2014 7:02:48 AM
NO RATINGS
@eetcowie: I'm really enjoying this blog series! We use to forget that Electric/Electronic Engineering is not only about Physics, but also it's closely related with Chemistry.

I agree with Antedeluvian in that you should consider writting a book. In any case, I'm already keeping a printed compilation of your battery technology blogs for future quick reference ;-)

antedeluvian
User Rank
Author
A book
antedeluvian   7/17/2014 1:30:18 PM
NO RATINGS
Ivan

I still think there is a book in your future! Seriously, when you complete this series, use it a basis. Put me down for one.

eetcowie
User Rank
Author
Re: Where does the heat come from?
eetcowie   7/16/2014 10:07:45 AM
NO RATINGS
Some applications that aren't naturally hot have a heater to get it started, and then are such high drain that the losses keep it hot enough (with thermal insulation). Other applications are already in a hot enough environment, such as in a spaceborne deployment for example, where the sun keeps it going.

Yes, heaters makes it inefficient -- but you can amortize the loss by not thermal cycling (re-starting) as much as possible, and by making the thermal insulation very effective for cases where self-heating doesn't work by itself.

In applications where the battery goes cold, the design is such that the restart to operating temperatures works, with some lifecycle/servicelife penalty.

Interesting questions.

David Ashton
User Rank
Author
Where does the heat come from?
David Ashton   7/16/2014 6:24:13 AM
NO RATINGS
Hi Ivan, another great article, thanks.

How are the high temperatures for this type of battery maintained?  Do they have to have heaters to keep the sodium molten?  And if so, does that not make it very inefficient?  If the cell is allowed to cool so that the sodium and/or sulfur solidify, is that the end of it or can it be restarted? 



Radio
NEXT UPCOMING BROADCAST
In conjunction with unveiling of EE Times’ Silicon 60 list, journalist & Silicon 60 researcher Peter Clarke hosts a conversation on startups in the electronics industry. One of Silicon Valley's great contributions to the world has been the demonstration of how the application of entrepreneurship and venture capital to electronics and semiconductor hardware can create wealth with developments in semiconductors, displays, design automation, MEMS and across the breadth of hardware developments. But in recent years concerns have been raised that traditional venture capital has turned its back on hardware-related startups in favor of software and Internet applications and services. Panelists from incubators join Peter Clarke in debate.
Flash Poll
Top Comments of the Week
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
Special Video Section
The LT®3042 is a high performance low dropout linear ...
Chwan-Jye Foo (C.J Foo), product marketing manager for ...
The LT®3752/LT3752-1 are current mode PWM controllers ...
LED lighting is an important feature in today’s and future ...
Active balancing of series connected battery stacks exists ...
After a four-year absence, Infineon returns to Mobile World ...
A laptop’s 65-watt adapter can be made 6 times smaller and ...
An industry network should have device and data security at ...
The LTC2975 is a four-channel PMBus Power System Manager ...
In this video, a new high speed CMOS output comparator ...
The LT8640 is a 42V, 5A synchronous step-down regulator ...
The LTC2000 high-speed DAC has low noise and excellent ...
How do you protect the load and ensure output continues to ...
General-purpose DACs have applications in instrumentation, ...
Linear Technology demonstrates its latest measurement ...
10:29
Demos from Maxim Integrated at Electronica 2014 show ...
Bosch CEO Stefan Finkbeiner shows off latest combo and ...
STMicroelectronics demoed this simple gesture control ...
Keysight shows you what signals lurk in real-time at 510MHz ...
TE Connectivity's clear-plastic, full-size model car shows ...