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Lithium-ion
unintended rapid disassembly |
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Bad Lithium Ion Charging
Basics Most systems using lithium-ion or
lithium-polymer batteries use a two-stage safety system. The first stage is the
battery charger, which is designed to safely charge the battery. The second
stage is the safety board, which prevents the battery from damage if the
charger goes haywire.
Occasionally for systems where the battery is not
replaceable developers don't put in a separate safety board, but rely on other
features of their internal circuitry to keep the battery safe.
This is
what happened to this prototype developed by one of our customers. They were
using a single 900 mAH battery without a safety board. An internal DC/DC
converter failed, presenting 6 volts 0.5 amps across the single 3.6 volt
prismatic lithium-ion cell.
The cell not only caused the damage shown
here, but filled the room with black soot covered a large area with battery
pieces and burned spots on the carpet.
Moral: please friends, be
safe.
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This picture shows the prototype laying on its
charging stand shortly after the event. The battery has spewed its guts. |
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Another view of the ejected battery parts under
the original circuit board |
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Here the prototype has been taken off the
charging station |
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The more-or-less empty casing of the prismatic
lithium-ion battery. |
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Custom design and manufacture of
state-of-the-art battery chargers, UPS, and power
supplies for OEMs in a hurry!
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PowerStream Technology:
140 South Mountainway Drive, Orem Utah 84058
Phone: 801-764-9060, 9062, 9063, or 9064
 Fax: 801-764-9061
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PowerStream Technology
140 South Mountainway Dr.
Orem, UT 84058
Phone: 801-764-9060, 9062, 9063, or 9064
Fax: 801-764-9061
Map & Directions |
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© Copyright 2000,
2002, 2003, 2005 Lund Instrument Engineering, Inc. All rights reserved
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