Secondary Battery Pouch Withstand Pressure Evaluation Device
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Solution Overview
Problem
The existing methods for evaluating the withstand pressure of pouch-type secondary batteries are inadequate, leading to potential safety issues due to varying sealing forces, which can result in fires and safety hazards if the sealing force is weak or defective.
Innovation Solution
A device and method that involve a storage unit, a spacer to form an internal space, an injector to inject air at positive pressure, and a pressure measuring unit to evaluate the pouch's withstand pressure by simulating internal pressure conditions, thereby identifying the sealing force and ensuring product stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the pouch exterior material is formed larger to collect gas during activation, then gas collection capability is improved, but the sealing force and withstand pressure of the pouch deteriorate
Solution Approach 1:
The pouch is divided into two distinct functional regions: a gas pocket portion for gas collection and a sealed pouch body for containing the electrode assembly. This segmentation allows the gas pocket to be larger for effective gas collection while the sealed pouch body maintains adequate sealing force and withstand pressure.
Solution Approach 2:
The gas pocket portion acts as an intermediary space between the sealed pouch body and the external environment. It collects gas generated during activation and prevents direct pressure buildup on the sealed pouch, thereby protecting the sealing integrity while enabling gas collection.
2Object-generated harmful factors
If the pouch size is increased for gas pocket formation, then gas generation capacity is improved, but the withstand pressure and safety of the pouch deteriorate
Solution Approach 1:
The pouch structure is segmented into a gas pocket portion and a sealed pouch body. The gas pocket can be larger to accommodate gas generation, while the sealed pouch body maintains sufficient thickness and strength for safety and reliability.
Solution Approach 2:
The gas pocket serves as a buffer zone that absorbs gas generation pressure, preventing direct transmission of pressure to the sealed pouch body. This intermediary structure enables high gas generation capacity while maintaining pouch safety through proper sealing.
3Ease of manufacture
If the sealing force is weakened to facilitate manufacturing, then ease of manufacture is improved, but the safety and risk of fire increase
Solution Approach 1:
The pouch is segmented into a gas pocket portion that can be sealed with lower force for ease of manufacture, and a sealed pouch body that maintains high sealing force for safety. This allows different sealing parameters for different regions, balancing manufacturing ease with fire risk prevention.
Solution Approach 2:
Different regions of the pouch have different sealing quality requirements. The gas pocket portion uses lighter sealing for ease of manufacture, while the sealed pouch body uses stronger sealing to prevent fire risk. This local differentiation of sealing quality resolves the contradiction between manufacturing ease and safety.
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
Effectively evaluates the pouch's withstand pressure, ensuring the stability and safety of secondary batteries by accurately measuring the sealing force, preventing potential fires and ensuring product reliability.
Implementation Method 1
a spacer configured to adsorb and then pull one side of the secondary battery to form an internal space of the secondary battery
Implementation Method 2
an injector configured to be installed in the spacer and pierce the secondary battery with a needle with an air injection channel formed therein, and inject air at positive pressure into the internal space of the secondary battery through the air injection passage
Implementation Method 3
a pressure measuring unit configured to measure air pressure in the internal space connected to the air injection passage
Data Source
AI summary
The present disclosure relates to a device for withstand pressure evaluation of secondary battery and a method for evaluating withstand pressure using the same to ensure the stability of the product by evaluating the withstand pressure of the pouch constituting the secondary battery, and the device includes a storage configured to have a storage space in which the secondary battery is stored, a spacer configured to adsorb and then pull one side of the secondary battery to form an internal space of the secondary battery, an injector configured to be installed in the spacer and pierce the secondary battery with a needle with an air injection channel formed therein, and inject air at positive pressure into the internal space of the secondary battery through the air injection passage, and a pressure measuring unit configured to measure air pressure in the internal space connected to the air injection passage.