Design method of electric vehicle battery simulation system for off-board charger field detection

Abstract

The invention provides a design method of an electric vehicle battery simulation system for off-board charger field detection, and aims to solve the problem that a charging load for off-board chargerfield detection is large in size and heavy in weight and is limited by external factors such as vehicle loading space, load and underground garage height limit. A power battery model is combined witha lightweight charging load, and the parameters of the charging load are adjusted in real time through the online estimation of the state of charge of the power battery model and the electromotive force of the battery so as to simulate the charging response of the power battery. A light-weight charging load is formed by cascading a vehicle-mounted power battery pack with a direct-current converter, and meanwhile, the system has constant-voltage, constant-current, constant-power and constant-resistance modes and has the capability of continuous adjustment within a rated range. An acceleration coefficient is introduced on the basis of a traditional power battery model, parameters such as the type, the specification, the temperature and the voltage of a battery can be set online according todetection requirements, and the autonomous testing of the off-board charger is achieved while the requirement for light weight of a charging load is met.

Description

Technical field[0001]The invention belongs to the field of on-site detection of electric vehicle charging equipment, and in particular relates to a design method of a lightweight electric vehicle battery simulation system used for on-site detection of electric vehicle off-board chargers.Background technique[0002]As the global energy crisis continues to intensify and environmental problems become increasingly prominent, compared with traditional vehicles, the huge advantages of electric vehicles in terms of energy saving and emission reduction have been valued by governments and auto companies in various countries, and the construction of electric vehicle charging infrastructure has emerged as the times require Raw. The operating state of the electric vehicle charging infrastructure will not only affect its own reliability, but also affect the service life of the power battery. Therefore, it is very important to test the performance of electric vehicle charging equipment. At present,...

AI Technical Summary

Problems solved by technology

In this way, a power battery pack with a single specification parameter has poor adaptability when used as a charging load for on-site testing, and it is difficult to meet the needs of on-site testing of off-board chargers of different specifications and models. In the normal charging process, the extreme parameters of the power battery pack, For example: the temperature of the single cell is too high, the voltage of the single cell is too high, generally it will not appear, it is difficult to test the emergency response and protection capabilities of off-board chargers

In addition, the state of charge and voltage of the power battery pack are determined by the actual energy storage of the battery, and the state of charge and voltage cannot be adjusted independently during the test. Therefore, the entire test process is passive, which takes a long time and has low efficiency. and test items are limited, and it is impossible to realize independent testing of non-vehicle chargers

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