Electric Vehicle Discharging Apparatus for V2V Charging
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Solution Overview
Problem
Electric vehicles face challenges with limited driving range due to battery exhaustion, leading to inability to complete journeys, and existing charging technologies are inefficient, costly, and space-intensive.
Innovation Solution
A discharging apparatus for electric vehicles that allows temporary charging of another vehicle with insufficient energy by using an AC charging interface, controller, battery manager, and power battery to convert DC to AC for external discharging, enabling the vehicle to function as a charging device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If large-capacity batteries are used to enhance endurance time, then the driving range is improved, but the charging time becomes too long
Solution Approach 1:
The patent implements dynamic charging power adjustment by controlling the charging power to gradually increase from a first charging power to a second charging power that is higher than the first, and then decrease to a third charging power. This dynamic adjustment optimizes the charging process to reduce overall charging time while protecting battery health, directly addressing the contradiction between long endurance and long charging time.
2Productivity
If a specialized DC charging station is used for fast charging, then the charging speed is improved, but the cost and occupied area increase
Solution Approach 1:
The patent enables electric vehicle power batteries to serve dual functions: both as energy storage for vehicle operation and as mobile charging sources for other vehicles. The discharging apparatus allows any electric vehicle with sufficient battery capacity to function as a charging station, eliminating the need for specialized DC charging infrastructure and reducing both cost and occupied area while maintaining fast charging capability.
Solution Approach 2:
The system enables electric vehicles to charge each other autonomously without requiring external specialized charging infrastructure. The discharging apparatus allows vehicles to self-serve as charging sources, transforming the charging ecosystem from centralized infrastructure-dependent to decentralized vehicle-to-vehicle service.
3Ease of operation
If an in-vehicle charger is used, then the charging portability is improved, but the charging power is insufficient due to volume limitations
Solution Approach 1:
The patent makes the power battery system universally functional for both vehicle propulsion and external charging purposes. The discharging apparatus enables the vehicle's own high-capacity battery to provide charging power to other vehicles, combining the portability of in-vehicle charging with the high power capability of large-capacity batteries, thus resolving the contradiction between portability and charging power.
4Device complexity
If single-phase charging technology is used, then the hardware simplicity is improved, but the charging power and charging speed decrease
Solution Approach 1:
The patent implements dynamic switching between charging modes and power levels. The controller can adjust charging power dynamically during the charging process, enabling the system to achieve high charging power when needed while maintaining operational simplicity, thus resolving the contradiction between hardware simplicity and charging power.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables electric vehicles to temporarily charge each other, extending their operational range and reducing the risk of being stranded due to battery exhaustion, while also improving charging efficiency and reducing hardware costs and space requirements.
Implementation Method 1
the controller converts the DC provided by the external discharging circuit into the AC and to output the AC to the AC charging interface so as to discharge to the another electric vehicle
Data Source
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AI summary
An electric automobile and a discharging device thereof. The discharging device comprises: an alternating current charging port (110); a charging connection device (120), configured to transfer, other electric automobiles, an alternating current output from the alternating current charging port; an instrument (130), configured to, upon receiving a trigger signal, send a discharging preparation instruction; a controller (140), communicating with the instrument (130), and configured to, after receiving the discharging preparation instruction, detect whether the charging connection device (120) is connected to the alternating current charging port (110), and if yes, send a Pulse Width Modulation (PWM) wave and switch to an external discharging mode; a battery manager (150), communicating with the controller (140), and configured to, after the controller (140) switches to the external discharging mode, control actuation of an external discharging loop in a high-voltage distribution cabinet of the electric automobile; and a power battery (160), configured to provide a direct current through the external discharging loop in the high-voltage distribution cabinet. The discharging device can charges an electric automobile without electricity, so as to solve the problem that the electric automobile cannot run because the battery power is used up on the halfway.