High-adaptive charging system and method for electric vehicle

Abstract

The invention relates to a high-adaptive charging system and method for an electric vehicle. The system comprises a power battery pack, a battery management system, a charging interface, a charging positive relay, a charging negative relay and a structure conversion relay group, wherein the charging positive relay comprises a positive relay in a common charging mode, a positive relay in a high-voltage charging mode, and a positive relay in a low-voltage charging mode. The structure conversion relay group controls the series-parallel connection structure of the battery pack, adjusts the charging voltage of the electric vehicle, and adjusts the charging voltage of the battery pack under the allowable charging current of a charger in order to adapt to a connected charging pile. For a high-voltage high-power charger, the system increases the charging voltage of the battery pack and the charging power of the battery pack, shortens the charging time, and improves the adaptability of the electric vehicle to long-distance driving. For a low-voltage charger, the system reducing the charging voltage of the battery pack, makes the battery pack compatible with the low-voltage charger, and reduces the dependence of the electric vehicle on general charging infrastructure.

Description

technical field [0001] The invention relates to the technical field of electric vehicle charging, in particular to a highly adaptable charging system and method for electric vehicles. Background technique [0002] Electric vehicles use electric motors as driving devices, and are powered by on-board rechargeable batteries or other energy storage devices. They have the advantages of zero emissions, high efficiency, quietness, smooth operation, easy driving and operation, low maintenance costs, and a wide range of required power sources. Therefore, in the existing new energy vehicle technology, it is regarded as a long-term development goal. [0003] The energy storage devices commonly used in electric vehicles are battery packs (hereinafter referred to as battery packs), such as commonly used lithium-ion battery modules, etc., which have the advantages of high specific energy and long life; currently, the commonly used battery pack charging equipment is a charger. It can be d...

AI Technical Summary

Problems solved by technology

The charging voltage mismatch between the charger and the battery pack is an important problem that currently limits the universal charging of pure electric vehicles

At present, the standard voltage output of common chargers on the market is usually 400V, 750V, 1000V, etc.; and the voltage range specifications of common electric vehicles on the market are many, and the battery voltage of general passenger cars is relatively low, mostly 300V-400V, and the battery voltage of large electric buses is relatively high, which cannot be directly applied to charging facilities with lower voltage; at the same time, when low-voltage batteries are used in high-voltage charging facilities, the energy consumption will be increased to a certain extent due to voltage loss. waste

This mismatch has limited the development of the electric vehicle industry to a certain extent

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