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SAFETY DESIGN

Valve (One way valve) If the internal pressure of the battery is raised to an abnormal level, the rubber one way valve opens to release excessive pressure; thus the vent protects the battery from danger of bursting. Since the rubber valve is instantly resealable, the valve can perform its function repeatedly whenever required.

Example of Valve Construction

Valve retainer

Top cover

Cover

Rubber one-way valve

Absorbent mat

  • Built-in thermostat Some battery models (LC-SD122PU and LC-SA122R3AU) have a built-in thermostat. If temperature of the battery is raised by an overcurrent due to problems such as failure of a quick charger, the thermostat detects the increased temperature and shuts off current to secure safe operation. Even in an extreme case in which the both terminals of the battery are shorted, the thermostat serves to release battery energy intermittently, thus protecting the battery from hazardous conditions such as overheating.

Example of Thermostat Construction

Filler

Actuator

Bimetal

Terminal plate

Lead wire

Contact plate

Contacts

Base

Housing

Temperature of the hottest part of battery (˚C)

Charge : 0.4 CA

Charge : 0.8 CA

Charge : 1.5 CA

Temp.: 40˚C

Temp.: 40˚C

Temp.: 40˚C

Temperature of Battery Overcharged

90

80

Temperature where the battery begins deformation

70

Battery LC-SD122Pa

60

50

40

  • 0

    1

2

3

1

2

0120 Overcharge time (hours)

Sealed Lead-Acid Handbook, Page 26

January 2000

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