Dual EV Battery Control by RPM and Power Demand
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Solution Overview
Problem
The fixedly mounted battery in electric vehicles may not be sufficient for extended driving distances, necessitating an improved battery management strategy.
Innovation Solution
A dual battery system is introduced, where a second high-voltage battery can be added or detached from the power system based on the driving conditions, with a controller determining which battery to use based on RPM and power requirements, optimizing power supply and charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a single fixedly mounted battery is used in the electric vehicle, then the system structure is simple, but the driving distance is insufficient
Solution Approach 1:
The battery system is segmented into a first battery (fixedly mounted) and a second battery (detachably connected). The second battery can be added or removed based on driving needs, allowing the system to provide extended driving distance when required while maintaining simple structure when the second battery is not in use.
2Duration of action of moving object
If a dual battery system is added to extend driving distance, then the driving distance is increased, but the system complexity increases
Solution Approach 1:
The battery system transitions from a static single-battery configuration to a dynamic dual-battery system where the second battery can be detachably connected or disconnected based on driving conditions. The controller dynamically determines which battery to use based on RPM and power requirements, optimizing the balance between driving distance and system complexity.
3Power
If the higher voltage battery is used during high-power operations, then the power supply capability is improved, but the energy efficiency decreases
Solution Approach 1:
The system changes the operating voltage parameter dynamically by selecting between the first battery (lower voltage) and the second battery (higher voltage) based on the driving conditions. During low-power operations, the lower voltage first battery is used for better energy efficiency. During high-power operations requiring greater output, the higher voltage second battery is selected to provide sufficient power supply capability.
4Use of energy by moving object
If the lower voltage battery is used during low-power operations, then the energy efficiency is improved, but the power supply capability is reduced
Solution Approach 1:
The controller monitors the driving conditions including RPM and power requirements, and changes the voltage parameter by switching between the first battery (lower voltage, higher efficiency) and the second battery (higher voltage, higher power capability). This ensures that the system operates at optimal efficiency during low-power conditions while maintaining sufficient power supply capability when needed.
Data Source
AI summary
A method for controlling an electric vehicle battery is provided. The electric vehicle includes a plurality of wheels, a driving motor for supplying power to the plurality of wheels, and a controller for controlling power supply to the driving motor and/or charging by the driving motor. The method includes selecting, by the controller, a battery among a first battery and a second battery according to revolutions per minute (RPM) and a power of the driving power. The method also includes controlling, by the controller the power supply and/or the charging by using the selected battery.