Dual Battery Drive Device Voltage Control
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Solution Overview
Problem
Existing drive devices face inefficiencies in power management due to the limitations of traditional power supply systems, which struggle to optimize energy distribution between high-capacity and high-power batteries, leading to suboptimal driving efficiency and battery deterioration.
Innovation Solution
A drive device comprising a high-capacity battery, a high-power battery, a voltage converter, and a controller that dynamically adjusts power distribution by interrupting current flow and controlling the voltage converter based on specific conditions to ensure the high-capacity battery operates within its withstand voltage limit, allowing for maximum and minimum conversion rates to achieve optimal driving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single battery is used to supply power to the driver, then the device complexity is reduced, but the driving efficiency cannot be optimized according to different power requirements
Solution Approach 1:
The power supply system is segmented into two distinct battery units: a first battery unit (high-capacity, low power weight density) and a second battery unit (high-power, low energy weight density). Each battery unit serves a specific function - the first for constant power supply and the second for peak power demands. This segmentation allows the system to optimize driving efficiency by selecting the appropriate battery based on power requirements, while maintaining manageable complexity through clear functional division.
2Power
If the voltage converter operates at high conversion rates to meet peak power demands, then the power delivery capability is improved, but the high-capacity battery may exceed its withstand voltage limit
Solution Approach 1:
The voltage converter acts as an intermediary between the second battery unit (high-power) and the first battery unit (high-capacity). It dynamically adjusts the voltage conversion rate based on real-time conditions: operating at high conversion rates during peak power demands when the first battery cannot supply sufficient power, and at low or zero conversion rates when the first battery can meet the demand. The controller monitors the first battery's voltage and automatically reduces the conversion rate before the voltage exceeds the withstand voltage limit, thus protecting the battery while maintaining power delivery capability.
3Force
If power is continuously supplied from both batteries to the driver, then the driving force requirement is met, but the high-capacity battery deteriorates due to excessive current flow
Solution Approach 1:
The power distribution strategy is dynamically adjusted based on real-time conditions including the required driving force, the first battery's voltage level, and the state of charge. The controller continuously monitors these parameters and switches between different power supply modes: (1) first battery only when voltage is within safe limits, (2) both batteries when peak power is needed and first battery voltage is sufficient, and (3) second battery only when first battery voltage approaches the withstand limit. This dynamic control ensures the high-capacity first battery is protected from excessive current flow that would cause deterioration, while still meeting driving force requirements through coordinated use of both batteries when appropriate.
4Use of energy by moving object
If the voltage converter is controlled to maintain optimal driving efficiency, then the energy utilization is improved, but the control complexity increases
Solution Approach 1:
The control system employs feedback mechanisms where the controller continuously monitors the first battery's voltage, the second battery's voltage, and the required driving force. Based on this feedback, the controller automatically adjusts the voltage converter's operation and power distribution strategy. When the first battery's voltage approaches the withstand voltage limit, the feedback signal triggers a reduction in the voltage conversion rate or switches to alternative power supply modes. This feedback-based control optimizes energy utilization by selecting the most efficient power source for current conditions while keeping the control logic relatively simple through clear threshold-based decision rules.
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 driving efficiency by optimizing power distribution between batteries, preventing battery deterioration and extending the drivable range of motor-driven vehicles by ensuring the high-capacity battery is used for constant power supply and the high-power battery for peak demands.
Implementation Method 1
a voltage converter that converts a voltage output from the second energy storage
Data Source
AI summary
A drive device includes a first energy storage, a second energy storage, a voltage converter, a driver, and circuitry. The first energy storage has a first power weight density and a first energy weight density. The second energy storage has a second power weight density higher than the first power weight density and a second energy weight density lower than the first weight density. The voltage converter converts a voltage output from the second energy storage. The driver is driven with power supplied from at least one of the first energy storage and the second energy storage. The circuitry is configured to interrupt current from the driver or from the second energy storage to the first energy storage. The circuitry is configured to control the voltage converter.