Multi-series-parallel battery module anomaly detection method

Abstract

The invention discloses a multi-series-parallel battery module anomaly detection method and aims to solve a problem that a traditional multi-series-parallel battery module detection method cannot quickly and accurately judge whether internal resistance and the capacity of the multi-series-parallel battery module are abnormal or not. The method comprises steps of S1, completing connection between abattery module and DCIR test equipment; S2, performing a 3C rate discharge test on the battery module by the DCIR test equipment; a BMS performing calculation to obtain a theoretical standard value,performs calculation to obtain a difference value between the voltage deviation voltage drop of each parallel module in the battery module and the overall average value, and judges whether the batterymodule is abnormal or not and the position of an abnormal parallel module in the battery module according to comparison between the difference value and a theoretical standard value; and S3, releasing or reworking the battery module according to calculation judgment of the BMS and the output result of the DCIR test equipment. The device is advantaged in that the device can automatically, reliablyand timely discover abnormity of a lead wire and abnormity of open circuit in the battery cell, so working hours and equipment cost are saved, and production efficiency is improved.

Description

technical field [0001] The invention relates to the field of battery module detection, in particular to a method for abnormal detection of multi-series parallel battery modules. Background technique [0002] At present, my country's new energy electric vehicle industry is developing rapidly. A very important part of the power battery system for pure electric vehicles is the battery module. The battery module will use different types of single cells for group assembly. The mainstream types of cells include: cylindrical cells, square cells , soft pack batteries and so on. Among them, cylindrical batteries (hereinafter referred to as batteries) are generally assembled into battery modules in a multi-series and multi-parallel manner to meet the capacity and voltage platform requirements of the battery system. As the capacity requirements of the battery system are getting higher and higher, the number of parallel connection of batteries is also increasing. [0003] Wires and m...

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Problems solved by technology

[0006] The invention mainly solves the problem that the traditional multi-series parallel battery module detection method cannot quickly and accurately judge the abnormal internal resistance and capacity of the multi-series parallel battery module; it provides a multi-series parallel battery module abnormality detection method, which can Automatically and accurately judge the internal resistance and capacity abnormal position and situation of the battery cells in the multi-series parallel battery module in a short time

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