P-130SCR/A34 Panasonic - BSG, P-130SCR/A34 Datasheet - Page 14

• Manufacturer Part Number: P-130SCR/A34
• Description: BATTERY NICAD SC SIZE R TYPE
• Manufacturer: Panasonic - BSG

Specifications of P-130SCR/A34

• Battery Cell Size: SC - Flat Top
• Voltage - Rated: 1.2V
• Capacity: 1300mAh
• Rechargeability: Yes
• Termination Style: Flat Top (Non-Extending)
• Internal Resistance: *
• Standard Charge Time: *
• Standard Charge Current: *
• Weight: 1.66 oz (47.06g)
• Lead Free Status / RoHS Status: Lead free / RoHS compliant by exemption
• Size / Dimension: -
• Other names: P-130SCR; P-130SCR/FT; P159

CHARGE METHODS FOR NI-CD BATTERIES - CONTINUED
(3) Details of Each Charge Method
Semi-constant-current Charge System
(1) Mechanism
(A) Mechanism
A resistance is positioned between the DC power
supply and the battery, thus stabilizing the charge
current. By keeping the charge current low enough
that the battery does not generate any heat, this
method performs charge without using any control.
(B) Calculation Example
The calculation formula for the block diagram of the
semi-constant-current charge system shown in Fig.
1 is as follows.
V
charge
V
battery voltage during charge at 20°C, 0.1 CmA)
N = Number of cells used
o
c
Fig. 1 Charge Characteristics of the Semi-constant-current
= Single-cell battery voltage (1.45 V/cell: average
= Output voltage of the DC power supply for
Fig. 2 Circuit Block Diagram of the Semi-constant-current
V
Ich
Charge System
Charge-system
B
0
V
O
V
B
R
Ich
V
Ich : Charge Current
B
NICKEL CADMIUM HANDBOOK, PAGE 13
t : Charge Time
: Battery Voltage
Ich
V
B
t
V
R = Charge current stabilizing resistance
Ich = Charge current
(K) is the stabilizing constant and must be selected in
accordance with the purpose of the device in which
the battery pack is used.
(2) Features
•
•
(3) General Specifications
(4) Cautions
•
•
•
B
N
= Battery voltage (V
u
The standard charge method for Ni-Cd batteries.
The charger construction is simple and
inexpensive.
If the specific conditions of the device require that
a charge rate higher than 0.1 CmA be used, the
overcharge performance and temperature rise
characteristics will vary according to the battery
type. Consult Panasonic for further details and
specifications.
If a large number of battery cells are used, or if
batteries having a high nominal capacity are used,
or if the heat dissipation of the battery pack is
poor, the batteries may generate heat even when
charged at 0.1 CmA. In such cases, it is
necessary to re-design the construction for better
heat dissipation or to lower the charge current.
Design so that the battery temperature rise at
saturation is no higher than 50°C.
The value of the above-mentioned stabilizing
constant (K) must be selected carefully. If the
value of K is too small, the fluctuation of the
charge current with respect to the fluctuation of
the power supply voltage will increase, and this
could cause insufficient charge or overcharge.
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