Renata SA 3V Lithium Coin Cells - DESIGNER'S GUIDE - Manual (Page 58)

Quality Management System
Since the very beginning of its business activities,
when Renata first started as a supplier of
batteries to the Swiss watch industry, it developed
a high level of quality-consciousness. «Quality
comes first» rules at every level of the enterprise.
Renata's quality management system is certified
according to the ISO 9001 and
ISO 14001
standard.
The basis for providing our worldwide customers
with top quality products is our continuous
product and process improvement.
The open circuit voltage (OCV), closed circuit
voltage (CCV) and mechanical dimensions of every
single RENATA lithium battery are checked
individually.
Batteries only leave our factory after a mandatory
storage period (quarantine) of at least 3 weeks.
During this period of time extensive performance
testing is done.
This testing comprises:
• various leakage resistance tests
• shelf life tests
• storage under varying atmospheric conditions
(artificial aging)
• discharge tests to monitor capacities
• electrical characteristic testing (voltage, internal
resistance, etc.)
• visual checks, including internal components of
dismantled batteries
The flow chart on next page shows the main
production steps and the integrated quality control
procedures for RENATA lithium batteries.
The controls on the product are the following (see
process flow chart on the next page):
Statistical control ("Quality tests" step)
performed for every batch, consisting of
a) discharge capacity check
b) leakage tests
After the Quality tests are successfully
completed, 100% of each batch is controlled
in terms of OCV, internal resistance (resistive
load method) and height ("Final control
100%" step).
If the battery is tabbed, after the tab welding
100% of each batch is re-controlled in terms
of OCV, internal resistance (resistive load
method; "Battery tagging 100% electrical
and tags" step).
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