Dual-Voltage EV Battery Switching by Motor Operating Point
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Solution Overview
Problem
The fixedly mounted batteries in electric vehicles often fail to meet the increasing driving demands, necessitating a more efficient power management strategy.
Innovation Solution
A dual battery system is introduced, where a second high-voltage battery can be added or detached based on the operation point of the driving motor, with a controller determining which battery to use based on RPM, torque, and power to optimize power supply and charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single fixed battery is used in the electric vehicle, then the system structure is simple, but the battery cannot meet increasing driving demands
Solution Approach 1:
The battery system is segmented into a first battery and a second battery, each with different voltage specifications. The controller can selectively use either battery or both batteries in combination based on driving conditions, thereby improving adaptability while managing system complexity through modular architecture
Solution Approach 2:
The battery system transitions from a static single-battery configuration to a dynamic multi-battery configuration where the controller continuously adjusts which battery(ies) to use based on real-time driving conditions, state of charge levels, and power demands, enabling the system to adapt flexibly to varying requirements
2Power
If a dual battery system is added to meet driving demands, then the power supply capability is improved, but the system complexity increases
Solution Approach 1:
The system implements partial action by using only one battery at a time when sufficient, and only activating the second battery or combining both batteries when additional power is required. This approach provides excess power capability when needed while avoiding the complexity of continuously managing both batteries under all operating conditions
Solution Approach 2:
The controller changes operational parameters by switching between different battery configurations (first battery only, second battery only, or both in combination) based on power demands and state of charge levels, thereby adjusting the effective power supply capability to match actual driving requirements without maintaining constant high complexity
3Use of energy by moving object
If batteries are used without strategic selection based on operation point, then the system is simple to operate, but energy efficiency is reduced
Solution Approach 1:
The controller continuously monitors driving conditions, operation point parameters (RPM, torque, power), and battery state of charge levels, using this feedback information to make real-time decisions about which battery to use. This feedback mechanism optimizes energy efficiency by selecting the most appropriate battery configuration for each operating condition without requiring complex manual intervention
Solution Approach 2:
The battery management system operates autonomously, with the controller automatically determining the optimal battery configuration based on real-time conditions without driver input. The system serves itself by making intelligent decisions about power distribution and battery selection, improving energy efficiency while maintaining ease of operation through automated control
4Adaptability or versatility
If the second battery is detachably connected, then the adaptability and driving distance are improved, but the reliability of power system connection may be reduced
Solution Approach 1:
The system performs preliminary actions by pre-establishing connection protocols and safety verification procedures before the second battery is detachably connected to the power system. This ensures that connections are made correctly and safely, maintaining reliability while enabling the adaptability benefits of a detachable dual-battery configuration
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 driving 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 an operation point of the driving motor. The method also includes controlling, by the controller, the power supply and/or the charging by using the selected battery.