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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 Technologies: 1163 S. 1680 West. Orem Utah 84058
Phone: 801-764-9060
Fax: 801-764-9061
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2011, 2012 Lund Instrument Engineering, Inc. All rights reserved |
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