Electric Vehicle Battery Simulation System for Mobile Field Test of Off-Board Charger

Abstract

An electric vehicle power battery simulation system simulating different power battery packs for the field test of the off-board charger is designed, which can be used to test the performance of an off-board charger. Specifically, the improved power battery model is combined with the improved lightweight charging load and the online estimation of the state of charge as well as the electromotive force of the battery model are used to adjust charging load parameters in real time to simulate the charging response. An acceleration coefficient is introduced into the traditional battery model to improve test efficiency, and the type, specification, temperature and voltage parameters of the battery can be set online according to the test requirements. An improved charging load scheme is proposed, in which a DC converter cascaded power battery pack of the mobile test vehicle is used to form a lightweight charging load with the mode of constant voltage, constant current, constant power and constant resistance and the ability to be adjusted continuously within the rated range. As a result, the size and weight of the charging load are reduced and the autonomous test of the off-board charger is realized. The performances of the proposed battery simulation system are validated through the various experimental results.

Research on Optimal Circuit Design and Charging Strategy of DC/DC Charger

“…At present, most electric vehicle chargers are non-vehicle chargers, whose input power is 380V three AC and output is DC. Off-board charger as the core part of the DC charging pile, its volume is not limited by space, and for three-phase power supply, so the output power is higher, the charging speed is also greatly improved, widely used [7][8][9].…”

Method of voltage setting for power battery simulator using successive nearest-neighbor interpolation

“…The new energy automobile industry has been identified as one of the key development directions of strategic emerging industries. 2 To achieve the breakthrough of the key technology of electric vehicles, the electric vehicle manufacturers need advanced experimental conditions, and the test platform is the preferred way, which combines the advantages of software simulation and real vehicle test. 3 The software simulation can shorten the development time and reduce the demand for hardware resources, which is suitable for application in the stage of system modeling and algorithm verification.…”

“…The new energy automobile industry has been identified as one of the key development directions of strategic emerging industries. 2…”