Device and method capable of performing bidirectional quick charging capacity between electric vehicles

Abstract

The invention discloses a device capable of performing a bidirectional quick charging capacity between electric vehicles. The device comprises a power battery pack, a BMS, a DCDC conversion module anda vehicle socket. A special cable joint is also included. One end, used for connecting a to-be-charged vehicle socket, of the special cable joint is a vehicle plug provided with a detection resistor.One end of the special cable joint, which is used for connecting a discharge end of a discharge device, is a quick-charge port connector; a first relay is arranged between a total voltage positive electrode end of the power battery pack and the DCDC conversion module; a second relay is arranged between the total voltage positive electrode end of the power battery pack and the positive electrode end of a vehicle socket; a third relay is arranged at the positive electrode end of a low-voltage auxiliary power supply of the electric vehicle; and a fifth relay is arranged between the total voltagenegative electrode end of the power battery pack and the negative electrode end of the vehicle socket, a fourth relay is arranged between the BMS and a second charging connection confirmation end ofthe vehicle socket, and a sixth relay is arranged between the BMS and a first charging connection confirmation end of the vehicle socket.

Description

technical field [0001] The invention relates to the field of electric vehicles, in particular to a device and method capable of performing bidirectional fast charging between electric vehicles. Background technique [0002] When the electric vehicle is driving on the road, it does not have time to charge and lies on the road. The solutions needed at this time are: 1) Call for rescue, contact the tow truck, and drag the car to a nearby charging pile for charging; 2) Use mobile Charging cars, use DC fast charging to fast charge electric vehicles; 3) Some electric vehicles / hybrid vehicles provide bidirectional two-way AC inverter discharge technology, which can output 220V AC, and AC slow charging guns can be used for feeding electric vehicles Connect to 220V AC, and the on-board charger will charge the power battery, such as figure 1 shown. [0003] The above three schemes have the following problems respectively: [0004] For option 1, the method of dragging the car to the...

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Problems solved by technology

[0005] For option 2, the number of mobile charging vehicles is small, the price is expensive, and the response speed is slow;

[0006] For option 3, the power battery voltage needs to be inverted during this process, and the electric vehicle that needs to be charged needs to perform PFC (power factor correction) and then convert it into the required charging voltage. The energy loss is relatively large, which is limited by the bidirectional inverter. The output power and the power of the car charger, the charging power is often not large, and the charging process takes a lot of time

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