Battery Deterioration Diagnosis Using CC-CV Charging Ratios
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Solution Overview
Problem
Existing battery diagnosis methods are not capable of diagnosing the state of batteries in a non-destructive manner, which can lead to potential accidents due to gas generation and electrode deterioration, especially in lithium batteries.
Innovation Solution
An apparatus and method that calculates constant current and constant voltage charging capacity ratios during a charging cycle to diagnose battery deterioration types, including capacity and complex deterioration, by comparing these ratios with preset change rates to adjust charging cut-off conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional battery diagnosis methods are used, then battery state monitoring is performed, but the diagnosis is destructive and cannot prevent accidents
Solution Approach 1:
The system performs preliminary diagnosis actions by calculating constant current charging capacity ratio and constant voltage charging capacity ratio before battery deterioration becomes severe. By analyzing these ratios during normal charging cycles, the system can predict potential deterioration types (capacity deterioration or complex deterioration) and take preventive measures before gas generation or electrode deterioration occurs, thus resolving the contradiction between maintaining reliability and preventing harmful factors.
2Productivity
If battery charging is continued without diagnosis, then productivity is maintained, but battery deterioration and potential accidents occur
Solution Approach 1:
The system implements feedback by continuously monitoring charging capacity ratios during charging cycles and comparing them against reference values to determine deterioration types. This feedback mechanism allows the system to adjust charging parameters or alert users about battery status without significantly interrupting charging operations, thus maintaining productivity while ensuring reliability through continuous state assessment.
3Measurement precision
If detailed battery analysis is performed, then diagnosis precision is improved, but the process becomes complex and time-consuming
Solution Approach 1:
The system segments the battery diagnosis process into distinct phases corresponding to constant current charging and constant voltage charging. By calculating capacity ratios separately for each phase and comparing them against specific reference values, the system achieves precise deterioration type diagnosis (capacity vs. complex deterioration) using a relatively simple computational approach, thus improving measurement precision without significantly increasing device complexity.
Data Source
AI summary
An apparatus for diagnosing a battery includes a data obtaining unit configured to obtain battery information including voltage and current of a battery during a charging cycle of the battery, and a control unit configured to calculate a constant current charging capacity ratio and a constant voltage charging capacity ratio during the charging cycle based on the battery information, and determine a deterioration type of the battery based on the constant current charging capacity ratio and the constant voltage charging capacity ratio.