Battery Output Map Control for Aging-Aware Power Limits
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Solution Overview
Problem
Existing battery management systems fail to effectively manage electric power output based on battery deterioration, leading to inefficiencies and potential safety issues.
Innovation Solution
A battery management apparatus that includes a controller, storage device, and sensors to derive an estimate resistance value, determine deterioration levels, and adjust power output using pre-stored maps, incorporating temperature adjustment to optimize power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If battery management systems do not account for deterioration levels, then device complexity is reduced, but power management accuracy and safety deteriorate
Solution Approach 1:
The system preliminarily stores multiple output maps corresponding to different deterioration levels in the storage device. These maps are prepared in advance and selected based on the current deterioration level, avoiding the need for complex real-time calculations while maintaining high power management accuracy
Solution Approach 2:
The system changes the internal resistance parameter over time to determine deterioration level. By monitoring how internal resistance changes from initial values, the system can identify the current deterioration level and select the appropriate output map, achieving accurate power management through parameter evolution tracking
2Measurement precision
If real-time internal resistance measurement is performed, then deterioration level detection precision is improved, but measurement time and processing time increase
Solution Approach 1:
Instead of performing complex real-time analysis, the system uses a simplified copying approach: it measures current internal resistance, compares it with stored initial resistance values, and copies the corresponding deterioration level from pre-established relationships. This maintains detection precision while minimizing processing time
Solution Approach 2:
Initial internal resistance values are measured and stored in advance during battery manufacturing or initial operation. These preliminary measurements create a reference baseline that enables rapid deterioration assessment without requiring time-consuming real-time analysis
3Adaptability or versatility
If multiple output maps are stored for different deterioration levels, then adaptability to battery aging is improved, but storage device complexity increases
Solution Approach 1:
The storage device stores multiple output maps that are segmented by deterioration levels. Each map contains power output characteristics specific to its deterioration level, allowing the system to adapt to battery aging by selecting the appropriate segmented map without requiring complex dynamic generation algorithms
4Reliability
If battery power output is controlled based on deterioration level, then reliability and safety are improved, but power output capability is reduced
Solution Approach 1:
The system dynamically adjusts power output based on the selected deterioration-level-specific output map. As the battery deteriorates, the system automatically transitions to maps that reflect reduced power capabilities, maintaining reliability by preventing over-stress while optimizing available power output for each deterioration stage
Solution Approach 2:
The output maps contain power output parameters that change according to deterioration level. By selecting appropriate maps, the system changes power output parameters to match the battery's current state, ensuring safety through parameter adaptation while maximizing usable power within safe limits
Data Source
AI summary
A battery management apparatus includes a battery, a storage device, and a controller. The controller includes at least one processor and at least one memory coupled to the processor. Output maps corresponding to deterioration levels are preliminarily stored in the storage device. In each output map, a maximum value of electric power outputtable from the battery is associated with a state-of-charge and a temperature of the battery. Each deterioration level is an indicator indicating a degree of deterioration of the battery. The processor is configured to: derive, as an estimate resistance value, an estimate value of internal resistance of the battery; derive the deterioration level at a derivation point of the estimate resistance value based on the estimate resistance value; determine an output map corresponding to the derived deterioration level from the output maps; and control the electric power to be output from the battery based on the output map.