Patent ID: 11959973
Assignee: SHANDONG UNIVERSITY
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A multi-fault diagnosis method for battery packs based on corrected sample entropy, comprising the following steps:
measuring cell voltages of a battery pack to be diagnosed;
constructing a cell voltage sequence according to the measured cell voltages of the battery pack to be diagnosed, and calculating a sample entropy value of the cell voltage sequence;
setting a correction coefficient for representing voltage fluctuation information, and correcting the sample entropy value through the correction coefficient to obtain a corrected sample entropy value; and
judging and outputting a fault type of the battery pack to be diagnosed according to a numerical value change of the corrected sample entropy value; wherein the correction coefficient for representing a voltage fluctuation direction is as follows:
when a real-time cell voltage at a time t is smaller than an average cell voltage in a sliding window N, the correction coefficient is a negative number,
when the real-time cell voltage at the time t is larger than the average cell voltage in a sliding window N, the correction coefficient is a positive number, and
when the real-time cell voltage at the time t is equal to the average cell voltage in a sliding window N, the correction coefficient is zero; wherein

in the judging and outputting the fault type of the battery pack to be diagnosed, the judging method specifically comprises:
if the corrected sample entropy value rises, judging that an over-voltage or open-circuit fault occurs; and
if the corrected sample entropy value drops, judging that an under-voltage or short-circuit fault occurs.