Aerial Vehicle Power Supply Balancing for Multi-Battery SOC Control
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Solution Overview
Problem
In aerial vehicles with multiple motors, irregularities in battery pack state of charge (SOC) and load lead to inefficient energy utilization, resulting in shorter flight distances and accelerated deterioration of battery capacity, as the capacities of battery packs are not balanced effectively.
Innovation Solution
A power supply system comprising multiple energy storage packs, a sub energy storage pack, switches, and a controller that adjusts capacity balance by controlling the switches, allowing for equalization of SOC and SOH among packs, and providing auxiliary current to high-load motors, thereby optimizing energy distribution and extending flight duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple battery packs are connected one-to-one with multiple motors, then each motor has dedicated power supply, but irregularities occur in remaining capacity (SOC) among battery packs due to irregularities in load among motors
Solution Approach 1:
The patent connects multiple battery packs in parallel through a common bus structure, merging their outputs into a unified power supply system. This allows all battery packs to contribute to all motors simultaneously, eliminating the one-to-one connection constraint and enabling flexible energy distribution that maintains SOC balance across the system.
Solution Approach 2:
The control unit implements a universal power management system that can dynamically allocate energy from any battery pack to any motor based on real-time SOC levels and load requirements. This multi-functional approach allows the system to adapt to varying operational conditions and maintain optimal capacity utilization across all battery packs.
2Device complexity
If battery packs operate independently with irregular load distribution, then system simplicity is maintained, but actual flight distance becomes shorter than flyable distance due to ineffective energy utilization
Solution Approach 1:
The control unit continuously monitors SOC levels of all battery packs and motor load conditions, using this feedback information to dynamically adjust power distribution. This closed-loop control ensures that energy is optimally allocated to maximize flight distance while preventing any single battery pack from depleting prematurely.
Solution Approach 2:
The system implements dynamic power allocation where the connection configuration between battery packs and motors can change in real-time based on operational conditions. The control unit actively manages current flow paths to adapt to varying load requirements and SOC levels, optimizing energy utilization throughout the flight duration.
3Ease of manufacture
If one-to-one connection is used between battery packs and motors, then connection simplicity is achieved, but irregularities occur in charge/discharge rate and depth of discharge among battery packs
Solution Approach 1:
The patent creates an equipotential power distribution network where all battery packs are connected to a common bus, ensuring equal electrical potential and enabling uniform charge/discharge conditions. This configuration allows current to flow freely among all battery packs based on their individual SOC levels, maintaining consistent operational parameters across the system.
4Device complexity
If independent battery pack operation is maintained, then system simplicity is preserved, but degree progress of deterioration state (SOH) becomes irregular and full charge capacity (FCC) decreases
Solution Approach 1:
The control unit performs preliminary balancing operations by monitoring SOC levels and proactively redistributing energy before significant imbalances occur. This preventive approach ensures that no battery pack is subjected to excessive depth of discharge or uneven charge cycles, thereby maintaining consistent SOH and preserving FCC across all battery packs throughout their operational life.
Data Source
AI summary
A plurality of energy storage packs supply a current to a plurality of motor driver that drive a plurality of motors mounted on moving object, respectively. Sub energy storage pack supplies a current to at least one of a plurality of first current paths connecting the plurality of motor driver and the plurality of energy storage packs, or pulls a current from at least one of the plurality of first current paths. Controller controls the plurality of first switches and the plurality of second switches to adjust capacities between the plurality of energy storage packs.