Dynamic Battery Charging Control for EV Sharing Services
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Solution Overview
Problem
The challenge of efficiently managing battery charging and exchange in sharing services for electric vehicles, particularly in dockless systems, where user behavior is unpredictable, making it difficult to control charging speeds and times effectively.
Innovation Solution
A battery management system that includes a management server evaluating battery exchangeability based on vehicle position, remaining battery amount, and user behavior, adjusting charging speeds at stations, and providing promotion information to increase exchange likelihood.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the charging speed is increased to reduce waiting time at battery stations, then the charging time is reduced, but the battery deterioration accelerates
Solution Approach 1:
The charging speed is made dynamic rather than fixed. The management server adjusts the charging speed in real-time based on the battery's state of charge, using higher speeds when the battery is partially charged and lower speeds when it is nearly full, thereby reducing overall charging time while preventing excessive deterioration from high-speed charging throughout the entire process.
Solution Approach 2:
The charging parameters (current and voltage) are changed dynamically during the charging process. The system transitions from constant high-speed charging to variable speed charging, adjusting electrical parameters based on the battery's charging stage to optimize both time efficiency and battery health.
2Adaptability or versatility
If battery stations are increased to improve service coverage, then the accessibility is improved, but the system cost increases
Solution Approach 1:
Battery stations are designed with multi-functionality, serving both as charging stations and as storage facilities for pre-charged batteries. This allows a single station to fulfill multiple roles: charging batteries for immediate exchange, storing charged batteries for future exchanges, and managing battery inventory, thereby reducing the need for additional dedicated stations.
Solution Approach 2:
The system performs preliminary charging actions at battery stations, maintaining a stock of pre-charged batteries ready for immediate exchange. This advance preparation eliminates the need for users to wait for charging and reduces the demand for additional stations, as existing stations can serve multiple users with pre-prepared batteries.
3Speed
If the battery is charged completely in advance to enable instant exchange, then the exchange speed is improved, but the charging time requirement increases
Solution Approach 1:
Batteries are charged in advance at battery stations and stored in a ready state for immediate exchange. This preliminary charging action decouples the charging process from the exchange moment, allowing users to receive fully charged batteries instantly while the charging occurs beforehand during off-peak periods or when the battery is not in use.
Solution Approach 2:
The system maintains continuous charging operations at battery stations, ensuring a steady supply of charged batteries. Multiple batteries are charged in sequence or parallel, creating a continuous flow of ready-to-exchange batteries that keeps the exchange process uninterrupted and maintains high exchange speed.
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 efficient battery management suitable for sharing services by accurately controlling charging speeds and promoting battery exchange, even in unpredictable user scenarios.
Implementation Method 1
a battery station capable of charging the battery by adjusting a charging speed
Data Source
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AI summary
A battery management system 100 of an electric vehicle suitable for a sharing service, including: an electric vehicle 2 capable of travelling by driving a motor with an exchangeable battery 1; a battery station 3 capable of charging the battery 1 by adjusting a charging speed; a management server 4 connected to the electric vehicle 2 and the battery station 3. The management server 4 evaluates exchangeability of the battery 1 stored in the battery station 3, on the basis of at least a position of the electric vehicle 2 and a battery remaining amount of battery 1 mounted on the electric vehicle 2, determines the charging speed of the battery 1 of the battery station 3, on the basis of an evaluation value of the exchangeability of the battery 1, and transmits control information relevant to the determined charging speed, to the battery station 3.