Datasheet

14
Valve Regulated Lead-Acid Batteries
15
Valve Regulated Lead-Acid Batteries
2 | General Information
In the final stage of charging, an oxygen-generating reaction
occurs at the positive plates. This oxygen transfers inside
the battery, then is absorbed into the surface of the negative
plates and consumed. These electrochemical reaction pro-
cesses are expressed as follows.
The electrochemical reaction processes of the sealed lead-
acid battery (negative electrode recombination type) are
described below. Where “charge” is the operation of supplying
the rechargeable battery with direct current from an external
power source to change the active material in the negative
plates chemically, and hence to store in the battery electric
energy in the form of chemical energy. “Discharge” is the
operation of drawing out electric energy from the battery to
operate external equipment.
(Positive electrode) (Negative electrode) (Electrolyte)
Discharge
Charge
(Lead dioxide) (Lead) (Sulfuric acid) (Lead sulfate) (Water)(Lead sulfate)
(Positive electrode) (Negative electrode) (Electrolyte)
Pb
2H O
2
PbSO
4
PbSO
4
PbO
2
2H SO
242
++++
cations
(Positive electrode)
(Negative electrode)
Charge
(Lead dioxide)
(Lead sulfate)
(Lead sulfate)
O
2
PbSO
4
PbSO
4
Gas recombination reaction cycle
Charge
Overcharge
(Oxygen)
(Lead)
Reaction
2
PbO
2
Pb(O )
2. Electrochemical Reactions on Electrodes
2 | General Information
3. Applications
Stand-by/Back-up power applications
– Communication equipment: base station, PBX, CATV,
WLL, ONU, STB, etc.
– Back-up for power failure: UPS, ECR, computer system
back-up, sequencers, etc.
– Energy saving: solar and/or wind powered lanterns, wind
powered advertising displays etc.
– Emergency equipment: lights, fire and burglar alarms,
radios, fire shutters, stop-position controls (for machines
and elevators), etc.
Main power applications
– Electrically operated vehicles: picking carts, automated
transports, electric wheelchairs, cleaning robots, electric
automobiles, electric lawnmovers, etc.
– Tools and engine starters: grass shears, hedge trimmers,
scouters, jet-skis, electric saws, etc.
–
Industrial equipment/instruments and non life-critical medical
equipment*: measuring equipment, non life-critical medical
equipment (electrocardio-graph), etc.
– Photography: camera strobes, VTR/VCR, movie lights, etc.
– Toys and hobby: radio-controllers, motor drives, lights, etc.
– Miscellaneous uses: integrated VTR/VCR, tape recorders,
other portable equipment, etc.
* (Note) When any medical equipment incorporating a Panasonic VRLA
battery is planned, please contact Panasonic.
4. Features
Leak-resistant structure
A required-minimum quantity of electrolyte is impregnated
into, and retained by, the positive and negative plates and
the separators; therefore electrolyte does not flow freely.
Also, the terminal has a sealed structure secured by long
adhesive-embedded paths and by the adoption of strong
epoxy adhesives which makes the battery leak-resistant.
(Note) In stand-by/back-up uses, if the battery continues
to be used beyond the point where discharge duration has
decreased to 50% of the initial (i.e. life judgment criteria),
cracking of the battery case may occur, resulting in leakage
of the electrolyte.
Long service life
Service life of our long-life series (LC-P, LC-X series) is ap-
proximately double that of the conventional (LC-R and LC-L
series) batteries (Temperature 20°C), discharge rate 0.25 CA/
1.75V/cell, discharge frequency every 6 months, 2.30V/cell
charge).
Easy maintenance
Unlike conventional batteries in which electrolyte can flow
freely, VRLA batteries do not need the specific-gravity
check of the electrolyte or the water top up maintenance,
this allows the battery to function fully with the minimum of
maintenance.
No sulfuric acid mist or gases
Unlike conventional batteries in which electrolyte can flow
freely, VRLA batteries generate no Sulphuric acid mist or
gases under Panasonic recommended use conditions.
If used under conditions other than recommended then gas
generation may occur, therefore do not design the battery
housing in a closed structure.
Exceptional deep discharge recovery
Our VRLA batteries show exceptional rechargeablity even
after deep discharge, which is often caused by failure to
turn off the equipment switch, followed by standing (approx.
1 month at room temperature is assumed).
water penetration tests. Battery case materials (example LC-R Series)
Gaskets
Positive electrode Negative electrode
Separator
Positive plate terminal Gaskets
Negative plate terminal
Battery case
Valve