Device and method for detecting battery performance of hybrid power vehicle

Abstract

The invention discloses a detector for hybrid vehicle battery performance and a detection method thereof; the detector comprises an engine, a motor, a battery electrically connected with a battery management unit; characterized by that: the battery management system is also connected with a signal collection unit; with the structure and detection method, collecting battery voltage, current change, battery temperature, battery allowance during and after starting process of the engine by the signal collection unit, so as to accomplish online monitoring for essential resistance of the battery, obtaining the essential resistance with a calculation formula of battery performance, and taking the value as a parameter for battery performance correction; predicting battery performance (SOF) through quantized battery performance (SOF) data, analog battery performance (SOF) curve and a curve of battery performance (SOF) and cycle relation; according to the predicted battery performance (SOF), correcting operation area of battery, so as to improve efficiency and useful life of the hybrid vehicle battery.

Description

technical field [0001] The technical solution to be protected by the present invention relates to a performance detection device and detection method for a battery of a hybrid electric vehicle. Background technique [0002] The performance of the hybrid vehicle powertrain is related to the performance of the battery. Battery performance testing mainly refers to the ability to test the battery’s charge and discharge performance, battery life, battery efficiency, and battery output power to evaluate whether the battery can meet the use requirements. Usually Factors considered include battery internal resistance, battery self-discharge, charge acceptability, discharge efficiency, etc. [0003] Hybrid batteries are generally composed of multiple single cells connected in series. Due to differences in the manufacture of single cells, different use environments, battery aging and other factors, after a period of use of the battery, the performance of each single cell will increase...

AI Technical Summary

Problems solved by technology

The traditional method of testing battery performance is to obtain the relationship between the number of cycles and the life of the battery through the battery pulse charge and discharge experiment, and then infer the remaining cycle times of the battery according to the number of charge and discharge times the battery has been used. Although this method is to a certain extent It can predict the performance of the battery, but because the key parameters of the battery are not used as the main basis for predicting the performance of the battery, the impact of the battery working environment on the performance of the battery is not considered, so this method has a large error

[0005] In order to improve fuel economy and prolong battery life, the hybrid battery sets different working ranges, but usually, the hybrid battery management system generally has a state of charge However, it does not provide a better method for predicting battery performance. Battery performance affects the reliability of hybrid vehicles. Battery performance is affected by many factors, such as battery state of charge, battery temperature, and battery aging. When battery performance When it is poor, if measures such as changing the battery working range are not taken, the battery life will be greatly shortened

That is, the existing hybrid battery management system cannot adjust the working range of the battery according to the performance of the battery

The existing battery management system does not consider the impact of the battery health status on the working range. No matter how the battery performance is, the same working range is selected, and the working range of the battery cannot be adjusted, which reduces the battery efficiency and life.

Traditional methods of testing battery performance cannot meet the above requirements

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