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〔Precautions for Designing Equipment〕
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As specified in these Battery Handling Precautions for Your Own Safety, improper handling of lithium batteries can lead to overheating, bursting
or fire. To prevent accidents, carefully observe the following precautions when designing equipment.
[for main power source]
Caution!
1. Select appropriate batteries for specific
uses.
To obtain maximum battery performance, be sure to select an
appropriate battery to meet the load, current, expected durability
and other equipment operating conditions. Improper selection may
generate excessive current flow, which in turn can cause heat
generation, fire or bursting, resulting in damage to the equipment.
Consult SANYO for details.
2. Observe the following precautions when
using two or more batteries in series or
in parallel.
Do not connect more than three cells in series. Do not use more
than one assembled battery pack (including 2CR5, CR-P2 and
2CR-1/3N). When connecting batteries in parallel, be sure to
mount a diode between the batteries.
When using two or more batteries, the equipment must be
designed so that the lithium battery will not be used together with
other batteries of different capacity, type or brand. Consult
SANYO when incorporating two or more batteries into the
equipment.
If different types of batteries are used together, the difference in
voltage, capacity, etc. may cause overdischarge of a battery with
inferior characteristics, resulting in heat generation, fire, bursting
or combustion.
If different types of batteries are used in parallel, the batteries
with inferior characteristics may be charged by the other
batteries, resulting in heat generation, fire, bursting or
combustion.
3. Use an independent power circuit for the
battery.
If equipment is designed with a dual or triple power source system
where the lithium battery is combined with other battery types or
an AC power source, an independent circuit must be provided to
prevent the lithium battery from forced charge or discharge by
other power sources in use.
4. Incorporate maximum current protection
devices.
To avoid excessive current flow due to an equipment circuit
malfunction, incorporate appropriate protective devices such as
a thermal fuse, resistor and PTC device that meet specific usage
conditions.
If excessive current flows from the battery due to an equipment
circuit malfunction, the circuit or equipment may be damaged. It
also may cause heat generation, fire, bursting or combustion.
[When using as auxiliary power source for
memory backup]
Caution!
1. Use an independent circuit for batteries.
To prevent lithium batteries from forced charge or discharge by the
main power source, use an independent circuit wherever possible.
2. Observe the following precautions when
connecting to a separate main power source.
If there is any possibility that electric current might flow from the
separate main power source to charge the battery, use a diode and
protective resistor in combination. For details, refer to the Primary
Lithium Batteries for Memory Backup ム Key Design Points, pages 5
and 6.
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●Rechargeable Lithium Batteries
Caution!
1. Consult SANYO when using two or more
batteries in series or in parallel.
2. Observe the charging conditions
(voltage and current).
Refer to the Rechargeable Lithium Batteries for Memory Backup -
Key Design Points for, pages 9 to 11.
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●Battery Holder and Compartment Structures
Caution!
1. Take special care when designing
battery holders and compartments.
A SANYO special battery holder is recommended.
The battery holder must be constructed so that the positive and
negative terminals of the battery cannot be reversed. Be especially
careful when using two or more batteries. The correct battery
placement direction (positive and negative polarity indications) and
installation instructions must be marked clearly and permanently on
the holder.
The battery holder must be constructed to prevent mixed use with
other batteries of different characteristics including voltage and type
of battery.
The battery compartment must be provided with a gas release
structure. For use with equipment of water-resistant construction, or
if there is any possibility of exposure to water, the compartment must
include features to prevent water from entering (such as a
waterproofing or dip-proof design).
If the battery compartment is airtight, it must have an explosion-
proof structure such as an explosion-proof vent or thin wall area for
emergency venting. If the equipment has any heat source, the
compartment must either be located away from the heat source
preventing the battery from exposure to heat or be constructed to
resist heat.
The battery compartment must be constructed so that batteries
cannot be easily removed by small children.
If the positive and negative terminals of a battery are reversed (when
two or more batteries are used), the improperly inserted battery may
be charged, resulting in heat, fire, bursting or combustion.
If gas is generated within an airtight battery compartment, its internal
pressure will rise, causing compartment explosion. If water enters
into the compartmental, it may cause electrolysis in the battery,
generating gas and causing an excessive rise in internal pressure
which is hazardous. To prevent equipment from exploding, an
airtight compartment must include an explosion-proof structure such
as a thin wall area for emergency venting.
Caution!
Be extremely careful to select contact materials and shapes that
provide sufficient electrical contact.
Avoid electrical contact with areas on the battery and circuit except
for designated contact points.
The contacts must be constructed to prevent the reversal of the
positive and negative terminals, thus taking the battery structure and
difference in the shapes of positive and negative terminals into
consideration.
Do not directly apply solder to the battery terminals.
inappropriate contact and/or terminal shapes may cause inferior
contact, resulting in heat generation or short circuiting.
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●Primary Lithium Batteries
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●Precautions for Contacts and Terminals