Battery Cell State Determination via Observer Grouping
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Solution Overview
Problem
Conventional battery management systems require significant computational effort and memory to determine the state of charge and aging of multiple battery cells, which becomes impractical for scalable battery platforms due to increasing computational and hardware requirements.
Innovation Solution
Divide battery cells into groups, observing a subset alternately to determine the state of charge and aging, using an average parameter change when scatter is within a limit, reducing computational effort and storage needs while maintaining high observation quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the state of charge and aging state of all battery cells is determined by observing each cell individually using dedicated observer structures, then the measurement precision and reliability of battery state determination is improved, but the computational effort and memory requirements increase significantly
Solution Approach 1:
The patent divides the battery cell population into groups, where each observer structure monitors a subset of cells rather than every cell individually. This segmentation allows the system to maintain adequate monitoring coverage while reducing the computational burden and memory requirements associated with tracking every cell separately.
Solution Approach 2:
The patent combines the monitoring of multiple battery cells into a single observer structure that handles groups of cells. By merging observation functions, the system reduces the total number of observer structures needed, thereby decreasing computational effort and memory usage while still providing comprehensive battery state assessment.
2Power
If the number of battery cells in a battery pack is increased to provide higher power output, then the power capability is improved, but the computational effort and hardware requirements for monitoring all cells increase
Solution Approach 1:
The patent creates observer structures that can universally monitor multiple battery cells simultaneously. This multi-functional approach allows a single observer structure to handle groups of cells, enabling the system to scale to larger battery packs with higher power output without proportionally increasing the computational and hardware resources required for monitoring.
3Reliability
If comprehensive monitoring of all battery cells is implemented to ensure safety and service life, then the reliability is improved, but the hardware costs and computational resources increase
Solution Approach 1:
The patent segments the battery cell population into groups that are monitored by shared observer structures. This segmentation maintains adequate safety monitoring and reliability assessment by ensuring all cells are observed, while reducing hardware costs and computational resources by avoiding redundant individual cell monitoring infrastructure.
Data Source
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AI summary
The invention relates to a method for determining at least one state of a plurality of spatially combined battery cells connected to each other by circuitry, wherein the state is determined by observing battery cells by means of at least one observer structure (20), and wherein a subset (nx) of a collectivity of battery cells (ntot) is observed and the state derived from the observation is determined for more battery cells (10) than for the observed battery cells (10). The invention further relates to a computer program, by means of which the method according to the invention can be carried out, and to a battery comprising a battery management system, which is designed such that the method according to the invention can be carried out thereby. The invention also relates to a motor vehicle comprising a battery according to the invention.