From: Mike Nickerson via EV
I think the problem happens when the constant current charger
doesn't stop when the cells are full. The cell can't store the
energy, but it has to go somewhere. They are sealed, so it can't
just bubble off water like lead-acid cells do. The energy breaks
down the
From: Mike Nickerson via EV ev@lists.evdl.org
I think the problem happens when the constant current charger doesn't stop
when the cells are full. The cell can't store the energy, but it has to go
somewhere. They are sealed, so it can't just bubble off water like lead-acid
cells do.
-
From: EV on behalf of Jan Steinman via EV
Sent: Wed 4/1/2015 9:33 PM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] Temperature rating (and Blowing them up!)
From: Robert Bruninga via EV ev@lists.evdl.org
That's 300 mA at 250 VDC.
The voltage doesn't really matter, does
I think the problem happens when the constant current charger doesn't stop when
the cells are full. The cell can't store the energy, but it has to go
somewhere. They are sealed, so it can't just bubble off water like lead-acid
cells do. The energy breaks down the electrolyte and builds
From: Robert Bruninga via EVev@lists.evdl.org
That's 300 mA at 250 VDC.
Jan Steinman via EV wrote:
The voltage doesn't really matter, does it?
It does indirectly. We're charging Prius packs. Each 6-cell module is
very flat, and sandwiched tightly between its neighbors. It has almost
no
From: Robert Bruninga via EV ev@lists.evdl.org
That's 300 mA at 250 VDC.
The voltage doesn't really matter, does it?
If you're charging with a constant-current source, all but one of the cells
could short, and the last cell would still see no more than 360 mW.
If you were charging
Same happens with NiMh: See my blown up Prius cells.
http://aprs.org/prius/photos/bad/OverC-Left-CellsX.JPG
http://aprs.org/prius/photos/bad/OverC-Right-BentX.JPG
All I did was p ut a 300 mA trickle on them... and then forgot about it.
Until 8 hours later when they began to explode...
Bob,
From: Robert Bruninga via EV ev@lists.evdl.org
Same happens with NiMh: See my blown up Prius cells... All I did was p ut a
300 mA trickle on them... and then forgot about it.
Until 8 hours later when they began to explode...
Wow, Bob. That is difficult to understand. Across one cell,
Discussion List
Subject: Re: [EVDL] Temperature rating (and Blowing them up!)
From: Robert Bruninga via EV ev@lists.evdl.org
Same happens with NiMh: See my blown up Prius cells... All I did was p
ut a 300 mA trickle on them... and then forgot about it.
Until 8 hours later when they began
