Soc/soh-Schätzung einer Lmfp-Zelle

Details

Veröffentlichungs-Nr.

EP4790760

Anmeldetag

6. Februar 2026

Veröffentlichung

12. August 2026

Rechtsraum

EP

Abstract

Systems and methods are disclosed for estimating state parameters of lithium manganese iron phosphate (LMFP) battery cells with improved accuracy and robustness. Per-cell estimation of state of charge (SOC) and state of health (SOH) is performed using electrical measurements including voltage, current, and temperature. In example implementations, shifts in characteristic voltage transition regions associated with manganese- and iron-based redox reactions are monitored to infer degradation during normal operation. Mechanical swelling force of the battery cell is measured using one or more pressure sensors, providing a physical indicator correlated with SOC and long-term lithium inventory loss, particularly in voltage-flat operating regions. Direct current internal resistance values obtained from controlled current pulses may further enhance estimation accuracy. These complementary estimation techniques may be implemented individually or in combination within a battery management system to improve diagnostics, adaptive control, and lifecycle management of LMFP battery cells in electrified vehicle and energy storage applications.

Anmelder

Firma

Cummins, Inc.

Land

🇺🇸 USA