  Whereas in typical standardized tests batteries are almost exclusively loaded
with constant current or relatively slowly changing cycles, real applications
involve rapid load ripple, which do not contribute to the net energy. The trend
to reduced filter capacitors and even dynamically reconfigurable batteries
further increases the ripple. The influence of rippled load on lithium
batteries is therefore receiving increased attention. According to recent
studies, accelerated ageing strongly depends on the frequency of the ripple. We
use electrochemical models to derive a highly simplified regression model that
catches the asymptotic behavior and allows parameter identification and
calibration to specific cells. The model allows quantitative monitoring of the
additional ageing due to ripple current in battery management systems.
Furthermore it enables active control of the ageing potential by influencing
the frequency content in modern battery systems, such as reconfigurable
batteries.
