Test Ensures Batteries Meet Performance and Reliability Requirements Whitepaper

A key test is measuring battery capacity to determine how much energy the battery can store and deliver. Environmental and accelerated-aging tests determine how battery capacity degrades with temperature, humidity, vibration and age, as well as how many charge discharge cycles the battery can withstand, and they help predict long-term reliability. Testing occurs at various stages of a battery’s life—during characterization at the development and prototype stage and in production tests. Batteries can continue to be tested even when in service; AC and DC internal-impedance tests can indicate an aging battery’s state of health.

Tests are required at the cell, module, and package levels. For modules and packages, all components must be thoroughly exercised during the test—not just the cells but everything from the busbars that connect cells and modules to the sensors and processing elements that comprise the battery-management system (BMS).