VL-2330/G1CN【PDF 1/3 页】BATT LITH COIN 3V 23MM VERT

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Preventing Quality Problems

Reduction of Battery Voltage and Deterioration of Capacity

(1) Reduction of battery voltage and deterioration of capacity through contact with antistatic

conductive materials

Incidents have been reported where terminal-mounted batteries for memory backup or coin-type lithium batteries have

come into contact with antistatic conductive materials, thus forming external discharge circuits and leading to voltage drops

or capacity deterioration.

In manufacturing plants using ICs, LSI and other semiconductor components, thoroughgoing antistatic measures are taken.

Various protective materials are used to prevent static: most of them have special compounds of carbon, aluminum foil and

other metals and are therefore conductive. These protective materials are used, for example, in the form of packaging bags,

trays, mats, sheets, films, corrugated boards and resin cases.

A protective material may have a resistance ranging from 10 3 to 10 6 ? /cm, for instance. This means that if the (+) and (-)

terminals of a battery come into contact with this material, a current ranging from several milliamperes to several microamperes

will flow and the battery will discharge, causing voltage drop and capacity deterioration.

A terminal-mounted battery was inserted into a

conductive mat. The battery charge was exhausted

in several days.

A battery was placed directly

on a rubber sheet spread over

a worktable. The (+) and (-)

terminals were in contact with

Exclusive grounding line

Conductive

the sheet and the battery

charge was exhausted.

rubber sheet

Conductive mat

Conductive rubber sheet

Battery-mounted PC boards were inadvertently

brought into contact with spacers and a conductive

When batteries are to be used near protective materials,

take every possible care to ensure that the (+) and (-)

rubber sheet. The battery

charge was exhausted.

Spacer

terminals of the batteries or PC boards, etc. on which

batteries are mounted do not touch these protective

materials directly.

Rubber sheet

A battery-mounted PC board was inadvertently

brought into contact with a conductive resin case.

The battery charge was exhausted.

Conductive resin case

LITHIUM HANDBOOK

AUGUST 2005

This information is generally descriptive only and is not intended to make or imply any representation, guarantee or warranty with respect to any cells and batteries. Cell and battery designs/specifications

are subject to modification without notice. Contact Panasonic for the latest information.

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