Battery Management Apparatus Dynamic Power Limit Control
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Solution Overview
Problem
The performance of batteries in eco-friendly vehicles deteriorates over time, leading to voltage characteristic changes and errors in state of charge between cells, resulting in rapid battery degradation and shorter-than-expected battery life, causing inconvenience in vehicle operation.
Innovation Solution
A battery management apparatus that adjusts power limit values based on voltage deviations and deterioration rates of battery cells, using a controller to detect voltage values, calculate power limit values from stored maps, and control battery discharge, while updating weights to optimize power usage and prevent over-discharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery is used continuously without adjustment, then the vehicle can operate, but the battery performance deteriorates rapidly due to voltage deviation and over-discharging
Solution Approach 1:
The power limit value is dynamically adjusted based on real-time voltage deviations among battery cells. The management controller continuously monitors voltage values and modifies the power limit accordingly, transitioning from a static to a dynamic control approach that adapts to changing battery conditions, thereby preventing over-discharging and extending battery life
Solution Approach 2:
The system implements feedback control by detecting voltage values of individual cells, calculating voltage deviations, and using this information to adjust the power limit value. This closed-loop feedback mechanism ensures the battery operates within safe parameters while maintaining vehicle functionality, resolving the contradiction between reliability and ease of operation
2Reliability
If the power limit is strictly controlled to prevent deterioration, then battery life is extended, but vehicle performance and user satisfaction decrease
Solution Approach 1:
Rather than applying a static power limit reduction, the system dynamically adjusts the power limit based on actual voltage deviation conditions. When voltage deviations are within acceptable ranges, the power limit remains high to maintain vehicle performance. When deviations exceed thresholds, the power limit is adjusted to prevent deterioration, thus resolving the contradiction between reliability and productivity
Solution Approach 2:
The system changes the power limit parameter based on voltage deviation measurements. By monitoring voltage values and calculating deviations among cells, the system adjusts the power limit parameter in real-time, allowing full performance when conditions permit and preventing deterioration when necessary, thereby maintaining both battery life and vehicle performance
3Measurement precision
If the battery management system monitors all cells continuously, then accurate voltage deviation detection is achieved, but system complexity increases
Solution Approach 1:
The battery system is segmented into individual cells, each with its voltage monitored separately. This segmentation allows precise detection of voltage deviations among cells by comparing individual voltage values, achieving high measurement precision while maintaining manageable system complexity through modular monitoring of discrete cell units
Data Source
AI summary
The disclosure relates to a battery management apparatus, a vehicle having the same, and a method of controlling the vehicle. A method of controlling the vehicle having a motor, an engine, and a battery includes detecting respective voltage values of the plurality of cells provided in the battery; identifying a maximum voltage value and a minimum voltage value among the voltage values of the plurality of cells; obtaining a voltage deviation value between the identified maximum voltage value and the minimum voltage value; obtaining a deterioration rate of the battery; obtaining a power limit value of the battery based on at least one of the voltage deviation value or the deterioration rate of the battery; obtaining a final power limit value based on the obtained power limit value and a preset weight; and controlling a discharge of the battery based on the obtained final power limit value.