Battery Degradation Estimation Across Variable Operating Modes
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Solution Overview
Problem
Existing methods for measuring storage battery degradation require operating the battery in a specific operation state, restricting its use and reducing its usefulness for management.
Innovation Solution
A storage battery management system that estimates degradation based on current, temperature, and charging rate without requiring a specific operation state, using a control unit to determine the battery's operation mode and apply the Arrhenius law to predict degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the battery is operated in a specific operation state for degradation measurement, then the degradation measurement accuracy is improved, but the operational flexibility and usefulness are reduced
Solution Approach 1:
The patent changes the parameters used for degradation estimation from requiring specific operation states to using multiple operational parameters (current, temperature, charging rate) that can be collected during normal battery operation. This allows degradation estimation across various operating conditions rather than requiring a single specific state.
Solution Approach 2:
The patent implements a dynamic degradation estimation approach that adapts to different operation modes (charging, discharging, idle) by selecting appropriate estimation methods for each mode. This dynamic adaptation maintains measurement accuracy while allowing the battery to operate in its normal, flexible manner without being constrained to a single operation state.
2Reliability
If the battery is constrained to a specific operation state for degradation measurement, then the measurement reliability is improved, but the productivity and efficiency are reduced
Solution Approach 1:
The patent enables continuous degradation estimation during normal battery operation without requiring the battery to be taken out of service for specialized measurement procedures. The control unit continuously monitors operational parameters and performs degradation estimation in real-time, maintaining both reliability and operational efficiency.
Solution Approach 2:
The battery management system performs self-diagnosis by using its own operational data (current, temperature, charging rate) to estimate degradation. This self-service capability eliminates the need for external specialized measurement equipment or procedures, maintaining reliability while preserving full operational productivity.
Data Source
AI summary
A storage battery management device includes a control unit. The control unit obtains a current value of a current flowing through a storage battery, a temperature of the storage battery, and a charging rate of the storage battery during a target period. The control unit determines an operation mode of the storage battery during the target period on the basis of the current value and the charging rate. The control unit estimates a degree of degradation of the storage battery during the target period on the basis of the operation mode and the temperature.