Realizing Reliable Lithium-Ion Batteries for Critical Remote-Located Offshore Systems

Abstract

AbstractOn-demand reliability is the key requirement for lithium-ion batteries (LIBs) used for powering time-critical remote-located offshore systems. Based on the reported lithium-ion (li-ion) cell failure model, failure rate and on-demand reliability of a li-ion cell are computed for a range of charge-discharge cycles and maintenance intervals. The results are extended to compute the on-demand reliability of LIB of industry-standard voltage ratings. Results indicate that, with present technical maturity, an LIB with 24V output, 500 annual charge-discharge cycles, and with 6 months of maintenance intervals requires three and six parallel groupings for achieving IEC 61508 Safety Integrity Level 4 under low- and high-demand scenarios, respectively. The results presented could be directly extended to determine the on-demand reliability for LIBs with higher capacities.