Battery Cell Self-Discharge Current Detection Under Polarization
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Solution Overview
Problem
Existing methods for detecting battery cell self-discharge current are inefficient and prone to interference from polarization and other factors, leading to inaccurate results.
Innovation Solution
A method that involves controlling a constant voltage source to charge a battery cell and switching to a constant current source when a threshold rate of change is exceeded, allowing for the determination of self-discharge current by analyzing the rate of change of the target current over time, thereby improving detection efficiency and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a constant voltage source is used to charge the battery cell and the stable current value is determined as the self-discharge current, then the detection process is simple, but the detection efficiency is low
Solution Approach 1:
The patent applies dynamics by switching between constant voltage charging and constant current charging modes based on the state of the battery cell. The system dynamically adjusts the charging method: using constant voltage charging initially, then switching to constant current charging when the voltage reaches a threshold, and finally returning to constant voltage charging for self-discharge current detection. This dynamic approach resolves the contradiction by making the detection process adaptable to different battery states, thereby improving detection efficiency without requiring permanently complex detection circuits.
Solution Approach 2:
The patent changes the operating parameters of the power supply system by switching between constant voltage mode and constant current mode. During constant current charging, the current parameter is held constant while voltage varies; during constant voltage charging, the voltage parameter is held constant while current varies. This parameter switching enables efficient self-discharge current detection by creating optimal electrical conditions at different stages, resolving the efficiency-complexity contradiction.
2Measurement precision
If only constant voltage charging is used, then the detection method is simple, but the detection accuracy is affected by polarization and other factors
Solution Approach 1:
The patent applies preliminary action by performing constant current charging before constant voltage charging to prepare the battery cell in a specific state. The constant current charging phase pre-charges the battery to a predetermined voltage threshold, ensuring the battery is in an optimal state for subsequent self-discharge current detection. This preliminary preparation reduces polarization effects and improves measurement precision without requiring complex detection equipment.
Solution Approach 2:
The patent uses periodic action by alternating between constant current charging and constant voltage charging phases. The system periodically switches charging modes: first constant voltage charging, then constant current charging when voltage threshold is reached, then back to constant voltage charging for detection. This periodic switching creates favorable electrical conditions that minimize polarization interference and improve detection accuracy.
Data Source
AI summary
Disclosed are a battery cell self-discharge current detection method, apparatus, and device, and a computer storage medium. The method includes: controlling a constant voltage source to start charging a battery cell at a first moment, and acquiring a first rate of change of a target current over time in a first preset duration after the first moment; controlling, in the case where the first rate of change is greater than a first threshold value, a constant current source and the constant voltage source to charge the battery cell; acquiring, in the case of reaching a second moment, a second rate of change of the target current over time in a second preset duration after the second moment, wherein the second moment is a moment when the time for charging the battery cell using the constant current source and the constant voltage source reaches a third preset duration; and determining.