Pouch Battery Pressure Sensing for Accurate Internal Swelling Measurement
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Solution Overview
Problem
Existing pouch-shaped secondary batteries face challenges in accurately measuring internal pressure, which affects the prediction of case rupture and safety, due to non-uniform swelling and variations in pressure measurement depending on probe placement.
Innovation Solution
A pressure sensing device is integrated within the case of the pouch-shaped secondary battery, extending from inside to outside, with a gas pocket for gas reception and a measurement portion using a deformable gel to convert pressure into electrical signals, allowing direct and accurate pressure measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pressure sensor is disposed inside a pouch-type secondary battery to measure internal pressure, then measurement precision is improved, but device complexity and manufacturing difficulty increase due to the need for additional components and assembly steps
Solution Approach 1:
The pouch body film serves dual functions: as the structural enclosure of the battery and as the sensing element for internal pressure measurement. The resistive sheet integrated into the film allows the same component to both contain electrolyte and detect pressure changes, eliminating the need for separate pressure sensors.
Solution Approach 2:
The pressure sensing function is merged with the pouch body film by integrating a resistive sheet directly into the film structure. This combination creates a unified component that performs both containment and sensing functions, simplifying the overall device architecture.
2Measurement precision
If a pressure sensor is disposed inside the battery, then measurement precision is improved, but ease of manufacture deteriorates due to complex assembly processes
Solution Approach 1:
The pressure sensing function is merged with the pouch body film by integrating a resistive sheet directly into the film structure. This combination creates a unified component that performs both containment and sensing functions, simplifying the overall device architecture.
Solution Approach 2:
The pouch body film serves dual functions: as the structural enclosure of the battery and as the sensing element for internal pressure measurement. The resistive sheet integrated into the film allows the same component to both contain electrolyte and detect pressure changes, eliminating the need for separate pressure sensors.
3Measurement precision
If the entire pouch body film is used as a sensor, then measurement coverage is improved, but device complexity increases due to integrated sensing structures
Solution Approach 1:
Instead of making the entire pouch body film sensitive, only specific regions are equipped with resistive sheets where pressure measurement is needed. This partial action approach provides sufficient measurement coverage while keeping the sensing structure simple and manageable.
Solution Approach 2:
Resistive sheets are selectively placed in specific regions of the pouch body film where pressure measurement is most critical, such as near the electrodes or in areas prone to swelling. This local quality approach ensures measurement precision where needed without complicating the entire film structure.
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
Enables real-time monitoring of gas accumulation and battery lifespan, enhancing safety by predicting potential abnormalities and ensuring accurate pressure measurement without affecting battery density or performance.
Implementation Method 1
a resistive sheet having a resistance value different from an initial resistance value in an initial state in which the pouch-type secondary battery is not swollen
Data Source
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AI summary
POUCH-SHAPED SECONDARY BATTERY INCLUDING PRESSURE SENSING DEVICE CONFIGURED TO MEASURE INTERNAL PRESSURE The present invention relates to a pouch-shaped secondary battery including a pressure sensing device having one side located in the case and the other side located outside the case, the pressure sensing device being configured to accurately measure pressure in the pouch-shaped secondary battery. Consequently, it is possible to predict abnormality of the pouch-shaped secondary battery or lifespan of the pouch-shaped secondary battery.