Battery Health State Evaluation via Pulse Impedance Analysis
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Solution Overview
Problem
Conventional battery health state evaluation methods are inefficient due to their reliance on fixed DC discharge impedance, which varies with operating conditions, temperature, and battery deterioration, making dynamic and integrated evaluations necessary for accurate diagnosis.
Innovation Solution
A battery health state evaluation device and method that retrieves continuous voltage and current data during charging, idling, and pulse discharging, calculates evaluation indexes such as peak impedance levels, and compares them with stored past data to yield results like remaining capacity, failure risk, and lifespan levels, allowing for quick and accurate health state assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional DC discharge impedance evaluation is used, then the evaluation method is simple, but the diagnosis accuracy deteriorates because impedance varies with operating conditions, temperature, and deterioration status
Solution Approach 1:
The patent transitions from static DC discharge impedance measurement to dynamic impedance evaluation during pulse discharge operations. The system continuously monitors impedance changes during actual battery usage (starting pulses), capturing real-time health state information that reflects varying operating conditions, temperature effects, and deterioration status without requiring separate test procedures.
Solution Approach 2:
The evaluation system performs continuous impedance monitoring during the battery's normal pulse discharge operations rather than requiring periodic separate DC discharge tests. By utilizing the battery's operational pulses for evaluation, the system maintains continuous health assessment without interrupting or adding to the battery's useful service time.
2Measurement precision
If dynamic integrated evaluation is performed to correctly interpret battery health state, then the diagnosis accuracy improves, but the evaluation time increases
Solution Approach 1:
The evaluation system serves multiple functions simultaneously: it monitors battery health state, tracks impedance changes during pulse discharge, records temperature effects, and accumulates deterioration data all through the same pulse discharge measurement process. This multi-functional approach enables comprehensive dynamic evaluation without requiring separate dedicated tests for each parameter.
Solution Approach 2:
The battery's own operational pulses (starting discharges) are utilized as the evaluation stimulus, eliminating the need for external test equipment or separate DC discharge procedures. The system evaluates the battery using the battery's natural operational cycles, turning the battery's service function into its own diagnostic tool.
3Measurement precision
If comprehensive evaluation indexes are calculated during charging and idling, then the evaluation accuracy improves, but the processing complexity increases
Solution Approach 1:
The system performs preliminary data collection and processing during charging and idling periods, calculating evaluation indexes in advance before the actual pulse discharge evaluation. By preparing impedance baseline data, temperature compensation factors, and capacity metrics during these idle periods, the system reduces real-time processing complexity during critical pulse discharge events.
Data Source
AI summary
A battery health state evaluation method for evaluating a health state of a battery comprises a charging step, an idling step, a pulse discharging step, an evaluation index calculating step, and an evaluation result yielding step. The evaluation index calculating step retrieves a continuous voltage data and a continuous current data in a charging process, an idling process, and a pulse discharge process and calculates a plurality of evaluation indexed according to the continuous voltage data and continuous current data. The evaluation indexes are associated with the health state of the battery. The evaluation result yielding step evaluates the health state of the battery according to the indexes and yields an evaluation result. Therefore, the battery health state evaluation method is easy, convenient, and effective in performing a test quickly and accurately.