Battery Cell Insulation Withstand Testing With Current Feedback
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Solution Overview
Problem
Insulation withstand voltage testing for battery packs is inefficient due to the long duration required for voltage application and decrease, leading to low testing efficiency.
Innovation Solution
A method and system that applies a direct-current voltage from zero to a target voltage in a first preset time, monitors current values, and if they are below thresholds, determines the test passes, reducing the duration of voltage application and decrease by monitoring current values during the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage is gradually applied to the battery pack, then insulation safety is ensured, but testing duration becomes long resulting in low testing efficiency
Solution Approach 1:
The patent applies dynamic voltage application by adjusting the voltage rising rate based on real-time current monitoring. When current is within threshold, voltage rises faster; when current exceeds threshold, voltage rising slows or stops. This dynamic adjustment resolves the contradiction by optimizing both safety and efficiency.
Solution Approach 2:
The patent implements feedback control by continuously monitoring current during voltage application and using this information to adjust the voltage application rate. The feedback mechanism ensures insulation safety while minimizing testing duration, thereby improving testing efficiency.
2Productivity
If voltage application duration is shortened to improve testing efficiency, then testing speed increases, but risk of missing insulation defects increases
Solution Approach 1:
The feedback mechanism continuously monitors current during voltage application. Even with shortened duration, the real-time current feedback ensures that insulation defects are detected by identifying abnormal current patterns, thus maintaining defect detection accuracy while improving testing speed.
Solution Approach 2:
The patent allows rapid voltage application (skipping through safe ranges) when current monitoring indicates no defects, thereby shortening testing duration without compromising defect detection. The monitoring system ensures that defects are not missed even during rapid voltage application.
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
Improves the efficiency of insulation withstand voltage testing by shortening the duration of voltage application and decrease, thereby enhancing testing speed and accuracy.
Implementation Method 1
obtaining a first current value that is generated by the battery cell under test based on the direct-current voltage in the first preset time period; continuously applying, by the voltage applying device, the direct-current voltage of the target voltage to the battery cell under test in a second preset time period; and obtaining a second current value
Data Source
AI summary
An insulation withstand voltage testing method includes applying a direct-current voltage from a zero voltage to a target voltage to a battery cell in a first preset time period using a voltage applying circuit in response to a testing start signal; obtaining a first current value generated by the battery cell based on the direct-current voltage in the first preset time period; continuously applying the direct-current voltage of the target voltage to the battery cell in a second preset time period using the voltage applying circuit; obtaining a second current value generated by the battery cell based on the direct-current voltage in the second preset time period; and if the first current value is less than a first preset current threshold, and the second current value is less than a second preset current threshold, determining that the battery cell passes insulation withstand voltage testing of this time.