Sealed Battery Leak Testing Pressure Adjustment
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Solution Overview
Problem
Existing methods for manufacturing sealed batteries suffer from a high erroneous determination rate in leak testing due to the premature leakage of detection gas, leading to inaccurate assessment of battery airtightness.
Innovation Solution
A method that involves temporarily sealing the battery case, reducing its internal pressure, and then introducing detection gas to maintain a lower pressure inside the case compared to the outside, thereby minimizing gas leakage before leak testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If detection gas is introduced into the battery case at atmospheric pressure, then the leak testing can be performed, but the detection gas leaks out through the pouring hole before leak testing due to higher external pressure, causing low gas density and high erroneous determination rate
Solution Approach 1:
The patent changes the pressure parameter of the detection gas from atmospheric pressure to negative pressure (lower than external atmospheric pressure). This parameter change prevents the detection gas from leaking out through the pouring hole, maintains stable gas density inside the battery case, and enables accurate leak testing by ensuring the output value reliably reflects actual leakage conditions.
2Productivity
If the battery case is sealed immediately after filling, then production efficiency is improved, but the detection gas leaks out through the pouring hole before leak testing, causing measurement errors
Solution Approach 1:
The patent applies preliminary action by introducing the detection gas at negative pressure before the sealing operation. This preliminary pressure adjustment ensures that when the pouring hole is subsequently sealed, the detection gas remains trapped inside the battery case at stable density, preventing post-sealing leakage and ensuring reliable leak testing results without compromising production efficiency.
3Measurement precision
If the threshold is set to account for low detection gas density, then false positives are reduced, but the threshold becomes less sensitive to actual leakage detection
Solution Approach 1:
By changing the pressure parameter to negative pressure, the patent eliminates detection gas density variation caused by leakage. This stabilizes the detection gas density throughout the leak testing process, allowing the threshold to be set with high sensitivity to actual leakage while minimizing false positives, as the baseline density remains consistent and predictable.
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
This approach reduces the erroneous determination rate in leak testing by maintaining a stable gas density, allowing for more accurate assessments and improving the utilization of detection gas.
Implementation Method 1
a depressurizing step for depressurizing the battery case; and an introducing step for introducing the detection gas into the battery case under the negative pressure
Implementation Method 2
a determination is made with a helium-leak tester as to whether the helium gas leaks from the battery can
Data Source
AI summary
Provided is a method for manufacturing a sealed battery, capable of reducing an erroneous determination rate in a leak testing step. The method including the leak testing step for detecting leak of a detection gas introduced into a battery case, includes: an introducing step for introducing the detection gas into the battery case which is temporarily sealed by covering the battery case; and an adjusting step for adjusting at least one of the pressure inside the battery case temporarily sealed and the pressure outside the battery case so that the pressure inside the battery case into which the detection gas has been introduced is lower than the pressure outside the battery case.