Detection method of cell-life early warning apparatus

Abstract

The invention provides a detection method of a cell-life early warning apparatus. A current signal detection module, an ECU controller and an alarm device are included. The current signal detection module carries out detection processing on a current signal during an electric automobile driving process. Through the ECU controller, each process is predicted and estimated, which includes irreversible circulation losses of a cell under a driving conditions per hour. Circulation life losses of each phase are accumulated so as to acquire a total circulation loss of the cell. Based on the above condition, a residual life of the cell is estimated, and an alarm is given out when the total circulation loss of the cell reaches a predetermined value. In the invention, an influence of current circulation on the cell life is directly observed, an algorithm is simple and occupation to a MCU is less in the method of the invention compared to the occupation in a traditional method; because each current circulation is accurate so that an estimated result is relative accurate; a driving risk of an electric automobile is reduced and reliability of the electric automobile is increased.

Description

technical field [0001] The invention belongs to the technical field of new energy automobiles, and in particular relates to an automobile battery life estimation system and a monitoring method thereof. Background technique [0002] About one-third of the world's energy is used for human travel. Under the urgent needs of economic globalization and sustainable development, the development focus of the world's automobile industry is shifting. At present, the development of energy-saving and new energy vehicles has become the consensus of the automotive industry, and electric vehicles are the vanguard of this development direction. Among them, the power battery is the energy supply component of the electric vehicle, and its performance will directly affect the performance and development of the electric vehicle. [0003] The life of the power battery is the main performance indicator. At present, in order to study the life of the battery, it is generally carried out through so...

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Problems solved by technology

[0004] The invention patent with the application number 201510404799.5 discloses a battery life evaluation method, monitors the driving conditions of electric vehicles, and formulates a discharge strategy; repeats constant current charging of the power battery many times, and discharges according to the power battery discharge strategy; In the process of cyclic charge and discharge, if the current capacity of the power battery decays to a certain preset percentage of the initial rated capacity, the number of cycles of the power battery is determined, and the number of cycles is used as the cycle life of the power battery; although this method To a certain extent, it overcomes the disadvantage of poor effectiveness of constant current discharge, but it cannot explain the life of the vehicle's power battery under different discharge strategies

The invention patent with application number 201610068805.9 tracks the law of battery performance attenuation by simulating the environment of the vehicle, and predicts the performance attenuation of the battery during the entire life cycle of the vehicle through tracking analysis and simulation of capacity C and internal resistance R; Although it is suitable for practical engineering applications, the simulation algorithm for the investigation of the vehicle's operating conditions and internal resistance and other parameters in the early stage is complex, which occupies a large amount of memory and has high requirements for the MCU.

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