Intelligent charging method of electric automobile

Abstract

The invention relates to an intelligent charging method of an electric automobile. The method includes the following steps: 1, inserting a charging plug, powering up a battery management system, and initializing the battery management system; 2, acquiring the current state information of a battery by the battery management system, and reading preserved history charging information, interlock switch state information and system time; and 3, selecting a corresponding charging mode according to the information acquired in step 2, wherein the system time is consistent with a current actual time. Compared with the prior art, the intelligent controlled charging method has the advantages of safety, high efficiency, effective use of electrical network valley loading time to charge, and prolongation of the service life of the battery.

Description

technical field [0001] The invention relates to the field of automotive electronics, in particular to an intelligent charging method for electric vehicles. Background technique [0002] At present, electric vehicles are still in the promotion stage, and charging control technology is still in a relatively simple stage. Existing charge control methods: The first method is to charge the battery by setting a small constant current charge, and end the charge when the voltage is fully charged. In this method, because the charging current is relatively small, the charging time is relatively long and the charging efficiency is low. The second method is to charge by setting a relatively large constant current. When charging reaches the voltage limit condition, it will switch to constant voltage charging. When the current drops to the set value, stop charging, or when the battery voltage reaches the limit condition, force Stop charging. In this method, because electric vehicle bat...

AI Technical Summary

Problems solved by technology

In this method, because electric vehicle batteries are connected in series and in parallel, during the constant voltage charging process, due to the inconsistency of the voltage of the battery cells, that is, the voltage of each battery after the batteries are connected in series cannot be exactly the same, so the battery The group cannot continue to use the charging method of the single battery

For example: Lithium manganate battery pack 1 and 100 strings, when the total voltage of constant current charging is less than 420V, the voltage of one of the monomers will reach 4.2V first, if you continue to charge with this total voltage and constant voltage, two problems will occur. Two situations: one is that the single battery with the highest voltage will be overcharged, and the other is that the charging of the battery stops, and the battery pack is not fully charged as a result.

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