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

Claim 6:
7. A multi-fault diagnosis system based on corrected sample entropy, comprising:
a module, configured to measure cell voltages of a battery pack to be diagnosed;
a module, configured to construct a cell voltage sequence according to the measured cell voltages of the battery pack to be diagnosed and calculate a sample entropy value of the cell voltage sequence;
a module, configured to set a correction coefficient for representing voltage fluctuation information, and correct the sample entropy value through the correction coefficient to obtain a corrected sample entropy value; and
a module, configured to judge and output 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 an 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 an average cell voltage in a sliding window N, the correction coefficient is zero;

a judging method of the module configured to judge and output the fault type of the battery pack to be diagnosed 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.