EV Charging With Intermediate Storage for Power Loss Reduction
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Solution Overview
Problem
Charging electric vehicles is inefficient due to high energy losses from self-consumption of cooling devices at fast-charging stations and suboptimal charging power settings, which vary by region and vehicle design, leading to inefficiencies up to 25% when not optimized for specific conditions.
Innovation Solution
A method and system that allow motor vehicles to connect to an intermediate store coupled to an energy source or sink, enabling flexible selection of charging power based on situation parameters like temperature and current flow, optimizing efficiency by determining the most efficient charging power value through a relationship stored in a control device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If fast charging with high charging power is used, then charging speed is improved, but charging efficiency deteriorates due to high self-consumption of cooling devices
Solution Approach 1:
The patent introduces an intermediate store (stationary energy storage system) as a mediator between the energy source and the motor vehicle's energy store. This intermediary enables flexible charging power selection by decoupling the charging power from the energy source's output capacity, allowing optimization of charging efficiency while maintaining fast charging capability when needed.
Solution Approach 2:
The system dynamically adjusts the charging power based on situation parameters (temperature, state of charge, cooling capacity) rather than using fixed charging power values. The control device continuously monitors conditions and adapts the charging power to optimize efficiency while preventing thermal runaway, thereby resolving the contradiction between speed and efficiency.
2Productivity
If charging power is increased to reduce charging time, then productivity is improved, but energy losses increase due to cooling requirements
Solution Approach 1:
The system performs preliminary assessment of situation parameters (temperature, state of charge, cooling capacity) before initiating charging. The control device pre-determines the optimal charging power based on current conditions, preventing excessive energy losses from the outset while still achieving productive charging within acceptable timeframes.
Solution Approach 2:
The patent changes the charging power parameter dynamically based on situation parameters. Instead of using fixed high charging power, the system adjusts the charging power parameter according to temperature, state of charge, and cooling capacity, thereby reducing energy losses while maintaining acceptable charging productivity.
3Loss of energy
If charging power is optimized for specific vehicle designs and regions, then charging efficiency is improved, but adaptability deteriorates
Solution Approach 1:
The system uses dynamic adjustment of charging power based on real-time situation parameters rather than fixed region-specific or vehicle-specific settings. The control device adapts charging power to current conditions (temperature, state of charge, cooling capacity), providing both optimization for efficiency and adaptability to different vehicles and regions.
Solution Approach 2:
The intermediate store system provides universal functionality by accommodating different energy sources (AC/DC, various power levels) and different motor vehicle requirements. The system can optimize charging efficiency for any vehicle design while maintaining adaptability to different regions and charging scenarios through flexible power adjustment.
4Device complexity
If fixed charging power values are used from energy sources, then device complexity is reduced, but efficiency deteriorates due to inability to optimize for specific conditions
Solution Approach 1:
The intermediate store acts as a mediating system that adds flexibility without significantly increasing overall complexity. It buffers between the simple fixed-power energy source and the variable-power requirements of the motor vehicle, enabling efficiency optimization while keeping the energy source side simple and the vehicle side protected from complexity.
Data Source
AI summary
A method for carrying out a charging process using an energy store of a motor vehicle. The motor vehicle can be connected to an intermediate store coupled to an energy source in order to carry out the charging process. A relationship between at least one situation parameter, a charging power and an efficiency of the charging process is provided, a value of the situation parameter is determined, and at least if the charging process is to be carried out using the intermediate store according to a predetermined criterion, the charging process is carried out.