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Charging system and method for new energy automobile

A new energy vehicle and charging system technology, applied in the field of new energy vehicle charging, can solve problems such as low charging efficiency, public grid voltage fluctuations, and affecting the safe and stable operation of the grid, so as to improve utilization, reduce power supply pressure, and facilitate charging services Effect

Active Publication Date: 2021-08-27
深圳嘉信立诚科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the AC charging pile is the charging pile of the conventional slow charging method. The 220V or 380V AC power supply is provided externally, and the on-board battery is charged through the on-board charger. This charging method has low installation cost and can make full use of the low power consumption time for charging. , reduce the charging cost and prolong the service life of the battery; but the charging time is too long, and there are strict requirements on the parking time and location of the electric vehicle, resulting in a decrease in its utilization efficiency
The DC charging pile is the charging of the fast charging method. The non-vehicle charger completes the AC-DC conversion, and then directly charges the vehicle battery through the dedicated DC charging interface. The charging voltage is generally 400V or 750V, which meets the needs of emergency battery life. Compared with AC charging piles, this method has low charging efficiency, high work and installation costs, and high current, which has a great impact on battery life; at the same time, high-power charging has a large impact on the power grid, and it will also cause voltage fluctuations in the public power grid and generate harmonic hazards.
[0004] With the rapid increase in the number of electric vehicles, large-scale electric vehicle charging will further increase the peak-to-valley difference rate of the power grid, causing regional power grid load fluctuations, and fluctuations in grid voltage will cause fluctuations in the output voltage of charging piles, which in turn will affect Lifespan of EV batteries
In addition, affected by various factors, the charging demand of electric vehicles has the characteristics of randomness and dispersion in time and space, which increases the difficulty of grid operation and management. Wave pollution affects the safe and stable operation of the power grid

Method used

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  • Charging system and method for new energy automobile
  • Charging system and method for new energy automobile
  • Charging system and method for new energy automobile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] to combine figure 1 , a charging system for new energy vehicles, including a dispatching unit and a charging pile, the user sends a charging request to the dispatching unit through a mobile terminal, the dispatching unit recommends a charging pile for the user, and the dispatching unit provides a variety of charging stations for the user The scheme is selected by the user.

[0058] to combine figure 2 , the charging pile is connected to the power grid and the photovoltaic power generation unit through the main control unit, the main control unit stores the electric energy of the photovoltaic power generation unit in the energy storage battery pack, and the photovoltaic power generation unit stores electric energy in the energy storage battery pack When using segmented charging mode, including two stages of constant current charging stage and constant voltage charging stage, the battery state of charge SOC is used to measure the capacity of the energy storage battery p...

Embodiment 2

[0063] to combine Figure 4 , the protection circuit detects the fault of the charging pile, and the detection steps are as follows:

[0064] Step 1. The main control unit starts the fault detection program of the charging pile, and judges whether the input lacks a phase. If so, it directly cuts off the charging interface, otherwise it is included in the input overvoltage judgment;

[0065] Step 2. When the main control unit judges that the input is overvoltage, it will directly enter the delay state, and re-test after a delay of 5s. If it detects that the voltage has been too high for 3 times, it will directly exit and start the alarm module to display, otherwise it will enter the overcurrent judgment ;

[0066] Step 3. When the main control unit judges that the input is over-current, it directly disconnects the charging interface; otherwise, it judges whether the output is over-voltage; if it judges that the output is over-voltage, it directly disconnects the charging inter...

Embodiment 3

[0070] A charging method for a new energy vehicle, comprising the steps of:

[0071]S1. The user sends a charging request to the dispatching unit through the mobile terminal, and sends the remaining power of the electric vehicle. The dispatching unit recommends a suitable charging pile and charging scheme for the user through the dispatching strategy. After the user arrives at the designated charging pile, select fast charging on the charging pile mode or slow charge mode;

[0072] S2. When the user selects the slow charging mode, the bidirectional inverter module of the main control unit connects the power grid to the AC terminal of the charging interface of the charging pile to realize slow charging. When the power grid fails, the bidirectional inverter module of the main control unit will store It can convert the low-voltage direct current of the storage battery pack into high-voltage alternating current, and provide AC power for electric vehicles to realize slow charging; ...

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Abstract

The invention relates to a charging system and method for a new energy automobile. The system comprises a dispatching unit and a charging pile, the dispatching unit recommends the charging pile for a user, the charging pile is connected to a power grid and a photovoltaic power generation unit through a main control unit, and the main control unit stores the electric energy of the photovoltaic power generation unit in an energy storage battery pack; and the charging pile is provided with a charging interface connected with an electric vehicle, a main control unit of the charging pile achieves a slow charging mode for the electric vehicle through a bidirectional inversion module, the main control unit of the charging pile is connected to the charging interface through a power conversion unit to achieve a fast charging mode for the electric vehicle, and the main control unit is unidirectionally connected to the power conversion unit through the isolation driving module; According to the charging system provided by the invention, the energy storage type charging pile is adopted, the conventional and rapid charging functions of the AC / DC charging pile are compatible, a large amount of funds invested for power grid transformation are reduced through configuration of the energy storage battery, and the influence of access of a large number of charging piles on the power grid is offset.

Description

technical field [0001] The invention belongs to the technical field of new energy vehicle charging, and in particular relates to a charging system and method for new energy vehicles. Background technique [0002] With its advantages of energy saving, zero emission, low noise, and high efficiency, electric vehicles have gradually become the focus of governments and automobile manufacturers around the world, making them the mainstream of future automobile industry development. The development of electric vehicles requires the construction of supporting charging infrastructure, including various decentralized AC and DC charging equipment, and centralized large-scale charging and swapping stations; therefore, vigorously promoting the construction of charging infrastructure is an urgent task to accelerate the promotion and application of electric vehicles. However, as a large number of electric vehicles are connected to the grid for charging without regulation and control, it may...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L53/31B60L53/51B60L53/67B60L53/68H02J3/32
CPCB60L53/31B60L53/67B60L53/68B60L53/51H02J3/32Y02T10/72Y02T90/16Y02E70/30
Inventor 李炫
Owner 深圳嘉信立诚科技有限公司
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