Vorrichtung und Verfahren zur Erfassung des Innenwiderstandes einer Batterie

Details

Veröffentlichungs-Nr.

EP3916410

Aktenzeichen

EP21170367

Anmeldetag

26. April 2021

Veröffentlichung

26. Juli 2023

Erteilung

26. Juli 2023

Rechtsraum

EP

IPC

G01R31/389

Abstract

The application relates to battery internal resistance detection device (1) and method for power conversion device (2). The detection device (1) includes a data acquisition module (4) for acquiring a battery voltage and a battery current to obtain a DC voltage, an AC voltage, a DC current and an AC current, a first calculation module (5) for receiving the AC current and the AC voltage at a certain instant to output a first internal resistance value (Ri) and a battery capacitance (Cbat), a second calculation module (6) for receiving a plurality of DC currents (I_dc1, I_dc•••) and a plurality of DC voltages (U_dc1, U_dc2•••) at multiple instants and the battery capacitance (C_bat) to output a second internal resistance value (R₂), and a selection module (7) for receiving the first and second internal resistance value (R₁, R₂) and selecting one of the first and second internal resistance value (R₁, R₂) as battery internal resistance value. The application improves detection accuracy of battery internal resistance by combining DC and AC algorithms.

Anmelder

Firma

Delta Electronics (Shanghai) Co., Ltd.

Land

🇨🇳 China

Fachgebiete