Apparatus and method for detecting battery abnormality and cause thereof

摘要

Methods and apparatus for detecting abnormality of a battery pack are disclosed. The battery pack includes multiple battery cells coupled in series via at least one connecting wire. A first voltage drop between a positive electrode and a negative electrode of the battery pack is detected. A first set of voltage drops between a positive electrode and a negative electrode of each battery cell in the battery pack is also detected. A total voltage drop across the at least one connecting wire in the battery pack is calculated based on an absolute difference between the first voltage drop and a sum of the first set of voltage drops. Whether the battery pack is abnormal is determined by assessing the total voltage drop across the at least one connecting wire with respect to a predetermined threshold.

主权项

1. A method, implemented on a machine having at least one processor, storage, and a communication platform for detecting abnormality of a battery pack having a plurality of battery cells coupled in series via at least one connecting wire, comprising:
detecting a first voltage drop between a positive electrode and a negative electrode of the battery pack and a first set of voltage drops between a positive electrode and a negative electrode of each battery cell in the battery pack; calculating a total voltage drop across the at least one connecting wire in the battery pack based on an absolute difference between the first voltage drop and a sum of the first set of voltage drops; determining whether the battery pack is abnormal by assessing the total voltage drop across the at least one connecting wire with respect to a predetermined threshold; detecting a second voltage drop between the positive electrode and the negative electrode of the battery pack and a second set of voltage drops between the positive electrode and the negative electrode of each battery cell in the battery pack when the battery pack is neither in a charging period nor in a discharging period; calculating a detecting error based on an absolute difference between the second voltage drop and a sum of the second set of voltage drops; setting the predetermined threshold with a first threshold value which is greater than the detecting error; updating the predetermined threshold of the first threshold value to an updated predetermined threshold of a second threshold value which is greater than 1.5 times of the absolute difference between the first voltage drop and the sum of the first set of voltage drops, if the battery pack is determined to be normal based on the predetermined threshold of the first threshold value; measuring a current flowing through the battery pack; and establishing a relationship between the updated predetermined threshold and the current flowing through the battery pack.