Varta 63094, Technical Handbook

Page: 36 / 45

COINPOWER | 36
Battery Compartment Design
Protection circuit shall be isolated from the cell to
diminish damage from any electrolyte leakage which
may occur by mishap. The battery compartment shall
be designed not to allow leaked electrolyte access to
protection circuit.
Battery case material resistance for electrolyte shall be
considered when battery case material is selected.
Under abusive conditions the cell may vent. To
ensure venting cell has venting holes in cup on the
circumference of cell. Care has to be taken, that
overpressure can be released in any abusive condition.
Assembly must not interfere with venting mechanism.
Under abusive conditions the cell may vent; to ensure
safe venting, up to 1.5 mm of additional space in
axial direction is necessary. This can be ensured
e.g. by deflection space in cell compartment or a
predetermined breaking point.
Protection Circuit Module Design
Electrolyte has corrosive characteristics. Protection
circuit module may not work correctly if exposed to
electrolyte.
This should be considered in protection circuit module
design. Main wiring patterns shall be separated from
each other as much as possible.
Conductive patterns and connection terminals which
may be short-circuited by electrolyte leakage should be
separated from each other as much as possible. Another
method is coating the whole surface of the module by
conformal coating material.
Warning
The following warning language is to be provided with
the information packaged with the small cells and
batteries or equipment using them:
• Keep small cells and batteries which are considered
swallowable out of the reach of children.
• Swallowing may lead to burns, perforation of soft
tissue, and death. Severe burns can occur within 2 h
of ingestion.
• In case of ingestion of a cell or battery, seek medical
assistance promptly.
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