Rechargeable Battery State Evaluation via Charging Current Switching
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Solution Overview
Problem
There is a challenge in evaluating the state of rechargeable batteries mounted on individual electric vehicles, which are not frequently assessed, making it difficult to determine the electrical power that can be charged and discharged when these vehicles function as distributed power sources.
Innovation Solution
A rechargeable battery evaluation device is provided, which includes a charging controller to switch the charging current of a rechargeable battery and a state estimator to evaluate the battery's state based on changes in voltage and charging amount during the switching of charging currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If rechargeable batteries mounted on individual electric vehicles are not frequently assessed, then the vehicles can operate autonomously without intervention, but it becomes difficult to determine the electrical power that can be charged and discharged when these vehicles function as distributed power sources
Solution Approach 1:
The system performs preliminary evaluation of battery state during regular charging operations by switching charging currents and measuring voltage changes. This preliminary assessment captures battery degradation state and electrical power capability information before the vehicle needs to function as a distributed power source, eliminating the need for frequent separate assessments while maintaining accurate information availability.
2Measurement precision
If the charging current is switched during battery charging, then the battery state can be evaluated more accurately, but the charging process becomes more complex
Solution Approach 1:
The charging controller performs dual functions: it charges the battery while simultaneously evaluating battery state through controlled current switching and voltage measurement. This multi-functionality allows accurate battery assessment without adding separate evaluation equipment or significantly complicating the charging process, as the same charging infrastructure serves both purposes.
Data Source
AI summary
There is provided a rechargeable battery evaluation device including: a charging controller configured to switch charging current of a rechargeable battery being charged with first current to second current; and a first state estimator configured to estimate a state of the rechargeable battery based on a feature of change in at least one of a voltage and a charging amount of the rechargeable battery due to switching from the charging current to the second current.