Charging pile system

Abstract

The embodiment of the invention provides a charging pile system. The charging pile system comprises a system input bus, multiple charging pile module groups, a power distribution unit and multiple charging terminals corresponding to the multiple charging pile module groups. The system input bus is connected with the input ends of the multiple charging pile module groups, and the output ends of the multiple charging pile module groups are connected with the input ends of the multiple charging terminals through the power distribution unit. The power distribution unit comprises a first switching group, a second switching group, a third switching group and a controller, and each switching group comprises multiple switching elements. The controller is used for controlling the multiple switching elements, so that the multiple charging pile module groups are flexibly configured to the charging terminal with the power demand larger than the power of the corresponding charging pile module group in a series connection or parallel connection manner through the combination of the multiple switching elements. The charging pile system can effectively increase the ranges of the output voltage and current output to each charging terminal.

Description

technical field [0001] The invention relates to the technical field of electric vehicle charging, in particular to a charging pile system. Background technique [0002] The charging pile system is used to convert the electric energy of the grid (including the microgrid) into direct current of different voltage and current levels, and then directly charge the battery of the electric vehicle through the charging connection device. Such as figure 1 As shown, a typical DC charging pile system usually includes an input bus, a system control unit, a charging module, an output DC bus, and a charging terminal. Among them, the input bus is used to connect the input power to the charging module, and the charging module is used to convert the electric energy input by the bus into the DC power required by the electric vehicle, and then charge the battery of the electric vehicle through the output DC bus and the charging terminal. [0003] Due to the various application scenarios of el...

AI Technical Summary

Problems solved by technology

[0004] figure 2 It is the output characteristic diagram of the 750V / 15kW charging pile module with the best output power characteristics among the common charging module types at present. figure 2 It can be seen that even the charging pile module with optimal output power characteristics still cannot output constant power in the full voltage range

Charging piles are usually composed of multiple modules connected in parallel, for example, a charging pile rated at 750V / 60kW (consisting of 4 modules with figure 2 The modules with output characteristics are connected in parallel) when the output is 300V for charging, the maximum power is only 30kW. If the charging pile is to have enough power to charge an electric vehicle with a charging voltage of 300V and a charging current of 200A, the actual required charging power is 60kW. The rated power of the pile needs to be designed to be 120kW to ensure that the system can output 200A current at 300V output, which will cause waste of charging capacity

Therefore, it is difficult for this kind of charging pile to adapt to electric vehicles with different charging voltage and charging current requirements.

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