Flexible charging method and charger of electric car

Abstract

The invention discloses a flexible charging method and charger of an electric car. The flexible charging method is characterized in that BMS data of the electric car is collected in real time during charging, the collected BMS data is compared with the target charging data, power conversion modules can be controlled to be adjusted, so as to achieve the optimum charging current until the end of charging. According to the flexible charging method and charger of the electric car, under the condition of meeting demands of users, proper dynamic charging current is output to charge the battery, the aging speed of the battery is decreased, and the service life of the battery is further prolonged.

Description

【Technical field】 [0001] The invention belongs to the field of new energy and electric vehicles, and in particular relates to a flexible charging method and a charger for electric vehicles. 【Background technique】 [0002] Today, large-scale new energy electric vehicles are becoming popular, and the number of electric vehicles used will continue to increase in the next few years. Obviously, the battery, one of the core components of an electric vehicle, is a key factor in determining the service life of an electric vehicle. How to improve battery life and reduce battery aging in use is very important. [0003] The charging process of the battery is a complex electrochemical reaction process, which is related to many environmental factors, including the voltage difference of the battery cells, the state of charge (SOC), the difference in the ambient temperature of the battery, and the imbalance between the batteries after grouping. performance, the difference in battery char...

AI Technical Summary

Problems solved by technology

[0004] (1) BMS (Battery Management System, Battery Management System) charging management methods of electric vehicles vary, some BMS have pre-charging function, some do not; some BMS will adjust the charging current according to battery temperature, cell pressure difference, charging time and other conditions , some BMS do not have this function

[0005] (2) In reality, for example, when going to work or resting at night, electric vehicle users may not need fast and high-current charging, but the BMS cannot obtain the real needs of customers, so that the BMS of electric vehicles has always used larger charging when designing charging. current to quickly charge the battery

[0006] (3) The charging pile itself has no analysis and processing capabilities, and passively charges the battery according to the needs of the BMS;

[0007] The above situation makes the battery often passively accept a large charging current when charging. Experiments have shown that this will accelerate the aging of the battery and reduce the battery cycle life.

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