Method and system for detecting short circuit in vehicle power battery

Abstract

The invention relates to a method and system for detecting short circuit in a vehicle power battery. The method is characterized in that based on the current vehicle battery serial-parallel topology,a current sensor connected in series on a main circuit of a vehicle power battery serial-parallel structure is utilized, a current sensor is connected in series on at least one branch circuit of the vehicle power battery serial-parallel structure, the branch current measured by the current sensor on the branch circuit and the total current measured by the current sensor on the main circuit are then collected, the proportional relationship between the two is obtained, the change in the proportional relationship is detected, the detected change in the proportional relationship is determined through the Kirchhoff's current law to determine whether short circuit occurs in the vehicle power battery. The method is advantaged in that short circuit in the vehicle battery can be rapidly detected, the generation area of short circuit is determined on the basis, and the risk of thermal runaway caused by the internal short circuit of the vehicle battery is effectively prevented.

Description

technical field [0001] The invention relates to the field of power battery testing, in particular to a method and system for detecting short circuits in a vehicle power battery. Background technique [0002] Electric vehicle safety-related technologies have become one of the important factors restricting the development of electric vehicle technology and improving safety. The internal short circuit of the single battery in the vehicle battery pack is one of the important ways for the thermal runaway of the battery pack. There are many possibilities for the occurrence of short circuits in the single cells in the battery pack, such as battery defects, collisions, and aging. The occurrence of internal short circuit is currently difficult to predict, and can only be detected by a faster and more efficient method. At present, the methods for detecting internal short circuits in vehicle-mounted lithium battery packs are mostly based on the joint estimation method of sensors such...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the existing vehicle-mounted battery internal short-circuit detection method has a slow detection speed and is difficult to meet safety requirements, the present invention provides a vehicle-mounted battery internal short-circuit detection method. Current sensors are connected in series on the main circuit and several branch circuits and subsequent processing is carried out, which can quickly detect the local internal short circuit of the vehicle battery, and effectively prevent the thermal runaway of the vehicle battery due to the internal short circuit according to the area where the internal short circuit occurs.

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