Echelon-Use Battery Screening via Voltage Difference Charging
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Solution Overview
Problem
Current screening methods for echelon-use batteries have a low accuracy rate and are time-consuming, requiring full charging and discharging cycles to determine battery health and residual value.
Innovation Solution
A screening method and device using a constant-voltage difference constant-current charging circuit to collect voltage data from both standard and test batteries, calculating voltage difference data, and comparing it to an allowable echelon-use voltage difference range to qualify the test battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If full charging and discharging cycles are conducted to screen batteries, then screening accuracy is improved, but screening time increases
Solution Approach 1:
The patent extracts only the essential voltage difference information during a simplified charging process, eliminating the need for complete charging and discharging cycles. By focusing on voltage difference data collected during constant-current charging phases, the method obtains sufficient screening information without performing full battery cycles, thus reducing time while maintaining accuracy.
Solution Approach 2:
The patent performs preliminary voltage difference measurements during the charging process before complete charging is finished. By collecting and analyzing voltage difference data at intermediate stages, the method can determine battery quality without waiting for full charging and discharging cycles to complete, thereby reducing screening time while preserving measurement accuracy.
2Measurement precision
If independent charging and discharging tests are conducted on each battery, then screening accuracy is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple measurement functions into a single constant-voltage difference constant-current charging circuit. This integrated circuit performs both constant-current charging and voltage difference measurement simultaneously, eliminating the need for separate testing equipment and reducing system complexity while maintaining the ability to accurately assess battery quality.
Solution Approach 2:
The constant-voltage difference constant-current charging circuit is designed with multi-functionality, serving both as a charging device and a measurement instrument. By making the charging circuit universal, it can perform charging operations and voltage difference data collection without requiring additional specialized equipment, thus reducing device complexity.
3Measurement precision
If multiple charging and discharging cycles are performed to evaluate battery health, then measurement precision is improved, but productivity decreases
Solution Approach 1:
The patent extracts the essential evaluation information from a shortened testing process. By collecting voltage difference data during brief constant-current charging phases rather than requiring multiple complete cycles, the method obtains sufficient information for accurate battery health evaluation while significantly increasing screening throughput and productivity.
Solution Approach 2:
The patent applies partial action by conducting incomplete charging cycles that are sufficient for measurement purposes but stop before full charging is achieved. This partial charging approach, combined with voltage difference analysis, provides adequate evaluation data without the time cost of complete cycles, thereby improving productivity while maintaining measurement precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method improves screening accuracy and reduces time by using voltage difference data to quickly determine if a test battery meets echelon-use standards, eliminating detection errors and providing a more scientific screening standard.
Implementation Method 1
collecting a first initial voltage data and a first voltage change data of a standard battery of the same batch as a test battery through a constant-voltage difference constant-current charging circuit
Data Source
AI summary
Disclosed is a method and device for screening an echelon-use battery. The method includes: collecting a first initial voltage and a first voltage change data of a standard battery of the same batch as a test battery; acquiring a first voltage difference data; acquiring an allowable echelon-use voltage difference range corresponding to the first initial voltage according to the first initial voltage, the first voltage difference data and an allowable echelon-use deviation; collecting a second initial voltage and a second voltage change of the test battery, acquiring a second voltage difference data, when the second initial voltage and the first initial voltage are the same, determining whether the second voltage difference data falls within the allowable echelon-use voltage difference range, the test battery is qualified if the second voltage difference data falls into the range.