Battery Pack Degradation Diagnosis Using Cell Distribution Profiles
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Solution Overview
Problem
Existing battery packs with multiple cells experience degradation imbalances, leading to uneven available capacity and inefficiencies due to non-uniform degradation states among batteries, which are not effectively addressed by current management systems.
Innovation Solution
A battery managing apparatus and method that includes a profile acquisition unit to gather data on individual battery profiles and a diagnosis unit to calculate target ratios, generate distribution profiles, and diagnose the state of the battery pack based on predetermined conditions, identifying degradation imbalances and implementing balancing functions or alarms when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple battery cells are connected in series and parallel to increase battery pack capacity, then the battery pack capacity increases, but degradation imbalances occur among individual batteries leading to non-uniform degradation states
Solution Approach 1:
The patent segments the battery pack into individual battery units, acquiring separate profiles for each battery cell. By analyzing degradation at the individual cell level rather than treating the pack as a homogeneous unit, the system can identify and address degradation imbalances among specific cells while maintaining overall pack capacity.
Solution Approach 2:
The patent applies local quality by calculating target ratios and generating distribution profiles that reflect the specific degradation state of each individual battery cell. This localized analysis enables targeted diagnosis and management of degradation imbalances in specific cells rather than applying uniform management to the entire pack.
2Measurement precision
If individual battery profiles are analyzed to detect degradation imbalances, then diagnostic accuracy improves, but system complexity increases due to processing multiple battery data sets
Solution Approach 1:
The patent merges individual battery profile data into a unified distribution profile that displays the degradation state of all batteries in the pack. This consolidation approach maintains high diagnostic accuracy by preserving individual cell information while simplifying the overall data structure for easier processing and analysis.
Solution Approach 2:
The patent transforms raw battery profile data into derived parameters such as target ratios and distribution profiles. By changing the form of the data from raw profiles to standardized metrics, the system achieves precise degradation diagnosis while reducing the complexity of data processing through parameter normalization.
Data Source
AI summary
A battery managing apparatus according to an embodiment of the present disclosure includes a profile acquisition unit configured to acquire a first profile for each of a plurality of batteries included in a battery pack; and a diagnosis unit configured to calculate a target ratio from each of the plurality of first profiles, calculate each target value as a diagnostic factor based on a plurality of calculated target ratios, generate a distribution profile indicating a correspondence relationship between a plurality of calculated target values and the number of each of the plurality of target values, determine whether the distribution profile satisfies a predetermined condition, and diagnose a state of the battery pack according to a determination result.