Charging systems for electric vehicles

Abstract

The invention discloses a charging system for an electric vehicle, comprising: a power manager, the power manager is used to detect the state of the battery of the electric vehicle and generate battery state detection information; a charging module, the charging module includes N constant current charging sub-modules, Among them, the output current of each constant current charging sub-module is equal, and N is a positive integer; the parallel output module is connected with the charging module and the battery for charging the battery; the control module, the control module and the power manager and the charging The modules are connected, and the control module calculates the charging current according to the battery state detection information, and calculates the number M of constant-current charging sub-modules according to the charging current, and starts M constant-current charging sub-modules to charge the battery, where M is less than or equal to N positive integer of . The electric vehicle charging system of the present invention can realize that each constant-current charging sub-module charges the battery with a segmented and stable constant current, and the charging is safe, fast, efficient, low in power consumption, environmentally friendly and pollution-free.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a charging system for electric vehicles. Background technique [0002] The modern logistics industry has become a pillar industry of the national economy in the new century, and the forklift, known as the "god of transportation", plays a huge role in the logistics field. Forklifts are mainly used in production and warehousing, and most of the use time is in a closed indoor environment. Therefore, any emissions and pollution caused by the use of forklifts will seriously affect the workshop and warehouse environment. Among them, food, pharmaceuticals, supermarkets, etc. are harmful to the environment. The pollution caused by forklifts in demanding industries is even more miserable. [0003] At present, the forklifts on the market are mainly fuel trucks and lead-acid electric forklifts, neither of which can be truly environmentally friendly and pollution-free. In additio...

AI Technical Summary

Problems solved by technology

[0005] 1) Although the constant voltage charging method is close to the optimal charging curve, the charging efficiency is low, and the initial charging current is too large to damage the battery

[0006] 2) The constant current charging method will cause the problem of battery overcharging if the charging current remains unchanged in the later stage

[0007] 3) The float charging method can only be used for batteries with a large remaining capacity

[0008] 4) In the pulse charging mode, when the charging current is small, the switch conduction duty ratio is low, and it is difficult to control

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