Dual-Battery EV Drive Voltage Switching for Speed-Torque Efficiency
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Solution Overview
Problem
Electric vehicles face inefficiencies in power management due to fixed battery configurations, which limit adaptability to varying operating conditions, such as speed and torque, affecting overall vehicle efficiency and performance.
Innovation Solution
A power control system that includes a switchable battery with multiple packs configurable in series or parallel, controlled by a controller to adjust voltage levels through half-bridge buck converters, allowing dynamic voltage adjustment based on rotational speed and operating modes to optimize efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed battery configuration is used, then the system structure is simple, but the adaptability to varying operating conditions deteriorates
Solution Approach 1:
The patent implements dynamic reconfiguration of battery packs between series and parallel connections based on real-time operating conditions such as rotational speed and torque requirements. The controller dynamically switches between different battery configurations to optimize performance across varying operating conditions, transforming a static system into an adaptive one.
Solution Approach 2:
The battery system is divided into multiple independently controllable battery packs that can be selectively connected in different configurations. This segmentation allows the controller to reconfigure the battery architecture by connecting individual packs in series or parallel, providing flexibility without requiring a complete system redesign.
2Use of energy by moving object
If voltage levels are adjusted dynamically, then the energy efficiency is improved, but the control system complexity increases
Solution Approach 1:
The system dynamically changes electrical parameters (voltage and current) by reconfiguring battery connections and adjusting converter duty cycles based on operating conditions. The controller modifies these parameters in real-time to optimize energy efficiency across different motoring and regeneration scenarios.
Solution Approach 2:
Half-bridge buck converters are introduced as intermediary devices between the battery packs and electric drives. These converters enable smooth voltage adjustment and isolation, allowing efficient power transfer while protecting the battery system from direct load variations.
3Productivity
If multiple battery configurations are used, then the performance across different operating conditions is improved, but the switching complexity increases
Solution Approach 1:
The controller continuously monitors operating conditions such as rotational speed, torque, and power demands, then uses this feedback to determine the optimal battery configuration. This closed-loop control ensures the system automatically adapts to changing conditions while maintaining vehicle efficiency.
Solution Approach 2:
The system implements dynamic switching between battery configurations based on real-time operational requirements. The controller transitions between series and parallel connections as needed, creating a flexible system that optimizes performance for both motoring and regeneration phases.
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
This solution enhances the efficiency of electric vehicles by dynamically adjusting voltage levels according to operating conditions, improving performance and reducing energy losses by selecting the most efficient configuration for motoring or regeneration.
Implementation Method 1
a first half-bridge buck converter connecting the first electric drive to a first battery back of the at least two battery packs
Implementation Method 2
a first saturable inductor disposed between the first half-bridge buck converter and the first electric drive
Data Source
AI summary
An electric drive system for an electric vehicle is provided. The electric drive system includes a first electric drive, a second electric drive, and a switchable battery including at least two battery packs that are selectively arranged in one of a series configuration and a parallel configuration. The electric drive system also includes a first half-bridge buck converter connecting the first electric drive to a first battery back of the at least two battery packs of the switchable battery and a second half-bridge buck converter connecting the second electric drive to a second battery back of the at least two battery packs of the switchable battery. The electric drive system further includes a controller configured to control the configuration of the switchable battery, an operation of the first half-bridge buck converter, and the second half-bridge buck converter.