Satellite Battery Aging Suppression via Real-Time Task Scheduling
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Solution Overview
Problem
Satellite batteries, particularly those in low earth orbit, experience accelerated aging due to the lithium plating phenomenon when charged at low temperatures, which is not effectively addressed by existing real-time scheduling techniques that focus on high-temperature aging.
Innovation Solution
A real-time scheduling method and apparatus that determines optimal execution timing for tasks in a satellite system to increase battery temperature, maximizing consumed currents and variance, thereby reducing the lithium plating phenomenon and extending battery lifespan by simultaneously executing tasks with higher current consumption and delaying their start within established execution limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the battery is charged at low temperature to maintain operational readiness, then the battery can be charged during eclipse periods, but the lithium plating phenomenon accelerates and battery lifespan is reduced
Solution Approach 1:
The patent changes the temperature parameter of the battery by scheduling high current-consuming tasks to increase heat generation during charging periods. This raises the battery temperature from low operating conditions to a range that prevents lithium plating while maintaining charging capability, thus resolving the contradiction between operational readiness and lifespan.
Solution Approach 2:
The patent performs preliminary scheduling of tasks before charging occurs, identifying and prioritizing high current-consuming tasks that will generate heat. This preliminary action ensures that the battery temperature is raised before charging begins, preventing lithium plating from the outset rather than reacting to the problem after it occurs.
2Reliability
If real-time scheduling is optimized for high-temperature aging suppression, then heat generation is minimized, but low-temperature lithium plating phenomenon is not addressed
Solution Approach 1:
The patent applies different scheduling strategies for different temperature conditions. When battery temperature is low, it prioritizes high current-consuming tasks to generate heat and prevent plating. When temperature is already high, it can minimize heat generation. This local adaptation to temperature conditions resolves the contradiction between high-temperature optimization and low-temperature effectiveness.
Solution Approach 2:
The patent makes the scheduling strategy dynamic by continuously monitoring battery temperature and adjusting task prioritization accordingly. The scheduling policy changes based on real-time temperature conditions, transitioning between heat-generation modes and normal operation modes, thus achieving adaptability across temperature ranges.
3Reliability
If tasks are scheduled to maximize current consumption variance, then heat generation increases and lithium plating is reduced, but real-time constraint satisfaction becomes more complex
Solution Approach 1:
The patent segments the scheduling decision into two parts: first identifying high current-consuming tasks based on pre-acquired information, then scheduling them during periods when heat generation is needed. This segmentation simplifies the algorithm by separating task identification from scheduling decisions, reducing overall complexity while maintaining effectiveness.
Solution Approach 2:
The patent uses pre-acquired task information (current consumption characteristics) to automatically identify which tasks should be prioritized for heat generation. The system serves itself by using its own stored knowledge about task characteristics to make scheduling decisions, eliminating the need for complex real-time analysis and reducing algorithmic complexity.
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
The proposed solution significantly improves battery lifespan by increasing heat generation, effectively mitigating the lithium plating phenomenon and extending the battery's operational life, as demonstrated by simulation results showing a 65.51% improvement in lifespan compared to conventional techniques.
Implementation Method 1
maximize a sum of consumed currents of the plurality of tasks... increases heat generation, effectively mitigating the lithium plating phenomenon
Data Source
AI summary
A real-time scheduling apparatus and method for suppressing battery aging of a satellite system are disclosed. A real-time scheduling method for suppressing battery aging of a satellite system according to an exemplary embodiment of the present disclosure may include acquiring task information including a request period and an execution time of each of a plurality of tasks which is performed in the satellite system; determining an execution limit range and an execution order for each of the plurality of tasks which satisfies a predetermined real-time constraint based on the task information; and determining an optimal execution timing within the execution limit range of each of the plurality of tasks, based on the execution order and consumed current information of each of the plurality of tasks.