Panasonic Valve Regulated Lead Acid Batteries 12V7.2A LC-R12V72P Benutzerhandbuch

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The electrochemical  reaction  processes of the
valve-regulated 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

2

4

2

+

+

+

+

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 processes are expressed as
follows.

(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 )