Internal short-circuit detection method of power battery

Abstract

The invention discloses an internal short-circuit detection method of a power battery. The internal short-circuit detection method comprises the following steps: detecting whether lowest voltage of the battery is lower than the set value and lasts for the preset time or not when a vehicle runs again or is charged, if so, judging the existence of short circuit, and performing maintenance operation on the battery through a prompt of a BMS (battery management system); identifying the difference of the battery in the static state through the BMS when the battery is arranged at the discharge tail end, if the difference in the capacity of the battery is too great, exceeds the set value and lasts for the preset time, judging the existence of the short circuit in the battery, emitting an alarm through the BMS and reminding of performing the maintenance operation on the battery; and recording the number of times of achieving cutoff voltage of the battery in the BMS, when the difference in the number of times of charge cutoff or discharge cutoff of the battery is larger than the set value, judging the existence of the short circuit in the battery, emitting the alarm through the BMS and reminding of performing the maintenance operation on the battery. According to the internal short-circuit detection method disclosed by the invention, the internal short circuit of the battery can be identified through a variety of means, and the internal short-circuit situation of the battery can be identified to the greatest extent by combining with a statistical method on the basis of long-term operation data.

Description

technical field [0001] The invention relates to the technical field of power batteries, in particular to a detection method for an internal short circuit of a power battery. Background technique [0002] Power batteries have been widely used in electric vehicles, and the safety and reliability of power batteries are related to the safe use of electric vehicles. The application of power batteries is affected by its characteristics, and has special requirements for ambient temperature and usage methods. During the application process, it is not only necessary to ensure that it operates in a good temperature environment, but also to set a reasonable usage method and detection method. The use method ensures the maximum performance of the battery, and the detection method ensures that the battery can be found in time when there is a problem, so as to avoid causing greater battery damage or even battery safety accidents. [0003] The internal short circuit of the battery is a saf...

AI Technical Summary

Problems solved by technology

[0005] Due to the requirements of power battery capacity and voltage, it is generally used in series and parallel connection of multiple cells. The manual analysis method is time-consuming and labor-intensive, and it is inevitable that there will be omissions due to human reasons, low reliability, and high manual maintenance costs.

This greatly affects the wide-scale use of power batteries in electric vehicles