Battery Power Limit Adjustment from Real-Time Cell Voltage Extremes
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Solution Overview
Problem
Conventional methods for setting the maximum output limit of a battery pack rely on pre-stored tables of temperature and voltage, which are inefficient and require additional storage, whereas the proposed method sets the maximum output limit in real-time based on maximum and minimum voltages without such tables.
Innovation Solution
The method involves real-time monitoring of battery cell voltages to adjust charging and discharging power limits by reducing the referential power limit when maximum or minimum voltages exceed allowable thresholds, with the counted value determining the reduction ratio and potentially stopping charging or discharging when a predetermined value is reached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pre-stored tables of temperature and voltage are used to set maximum output limit, then the battery pack output limit can be determined, but additional storage is required and the method is inefficient
Solution Approach 1:
The patent extracts the essential parameters (maximum and minimum voltages of battery cells) from the complex pre-stored tables containing temperature and voltage data. Instead of storing and querying large tables, the system only needs to monitor and compare real-time voltage values against predetermined thresholds, eliminating the need for additional storage while maintaining reliability in output limit determination.
Solution Approach 2:
The battery management system uses the battery cells' own voltage characteristics to determine the output limit. By monitoring the maximum and minimum voltages of individual cells and comparing them to predetermined values, the system self-regulates the charging/discharging power limits without requiring external lookup tables or complex storage structures.
2Reliability
If pre-stored tables are used for maximum output limit calculation, then output limit can be set, but efficiency is reduced due to table storage and retrieval operations
Solution Approach 1:
The patent extracts only the critical voltage threshold values from the comprehensive pre-stored tables, eliminating the need for storing and retrieving large datasets. The system achieves the same reliability in output limit setting by comparing real-time voltage measurements against these extracted threshold values, dramatically improving calculation efficiency.
Solution Approach 2:
The patent changes the parameter basis from complex multi-dimensional tables (temperature, voltage, output limit) to simple voltage threshold comparisons. By transforming the problem from table lookup to direct parameter comparison, the system maintains accurate output limit determination while achieving real-time calculation efficiency.
3Duration of action of moving object
If real-time voltage monitoring is performed to adjust power limits, then battery use time is extended and efficiency is enhanced, but continuous monitoring increases system complexity
Solution Approach 1:
The battery management system performs self-monitoring by continuously tracking the voltage of each battery cell and automatically adjusting charging/discharging power limits based on real-time conditions. This self-service approach extends battery use time through optimized power management without requiring complex external monitoring infrastructure.
Solution Approach 2:
The patent dynamically changes the power limit parameter based on real-time voltage measurements. By continuously monitoring voltage and adjusting the charging/discharging power limits accordingly, the system extends battery operational duration while maintaining relatively simple implementation through direct parameter adjustment rather than complex control algorithms.
Data Source
AI summary
Discussed is a method for managing a battery that includes a plurality of battery cells, the method being part of a control strategy programmed into a module battery management system (MBMS), the method includes a reference discharging power limit setting operation, via the MBMS, of setting a referential predetermined discharging power limit, a real-time discharging power limit setting operation, via the MBMS, of setting a real-time discharging power limit of the battery by reducing the reference predetermined discharging power limit according to a real-time voltage of the battery.