Cylindrical Battery Pressure Jig With Integrated Gas and Temperature Sensing
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Solution Overview
Problem
Conventional methods for measuring internal pressure in cylindrical battery cells are inaccurate due to gas leakage, electrolyte leakage, and temperature-related errors, as the pressure and gas discharge units are typically separated, and the installation of pressure sensors can alter the internal space, leading to incorrect pressure readings.
Innovation Solution
A jig that integrates a pressure sensor and a gas discharge unit in the same space, with a temperature sensor to correct for temperature changes, minimizing gas flow space and ensuring precise measurement by sealing the units with sealing materials and a coupling mechanism to maintain the original position of the battery cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pressure sensor is installed by drilling a hole in the battery cell for pressure measurement, then pressure measurement can be performed, but gas leakage, electrolyte leakage, and changes in internal space occur causing inaccurate measurement
Solution Approach 1:
A separate pressure sensor chamber is introduced as an intermediary component. Gas from the battery cell is discharged into this chamber where the pressure sensor is located, rather than placing the sensor directly in the battery cell. This mediator chamber prevents direct contact between the sensor installation and the battery cell, avoiding gas leakage, electrolyte leakage, and internal space changes while still enabling accurate pressure measurement.
2Ease of operation
If the pressure measuring device has a larger internal space, then the device can accommodate the battery cell, but gas discharged from the battery cell is located in an unnecessarily wide space causing measurement errors
Solution Approach 1:
The pressure sensor chamber is designed with a specific local geometry that concentrates the discharged gas into a confined space adjacent to the pressure sensor. Rather than having a uniformly large internal space, the chamber creates a localized region with optimized volume and shape that ensures gas molecules are positioned close to the sensor surface, improving measurement accuracy while still accommodating the battery cell.
3Device complexity
If the pressure measuring unit and gas discharge unit are separated, then the device structure is simpler, but the error value increases and measured pressure value has error due to temperature change
Solution Approach 1:
The pressure sensor chamber serves as both the gas discharge unit and the pressure measuring unit by integrating the pressure sensor directly into the chamber where gas is discharged. This merging of functions eliminates the need for separate units, maintaining structural simplicity while ensuring that temperature changes affect both the gas and sensor equally, thereby reducing measurement errors.
4Temperature
If the battery cell is heated during measurement, then the battery cell can be maintained at operating temperature, but the internal pressure increases due to temperature change causing measurement errors
Solution Approach 1:
A temperature sensor is installed in the pressure sensor chamber to monitor the temperature of the discharged gas. This temperature information is fed back to a control system that calculates the expected pressure increase due to temperature and subtracts it from the measured pressure, providing temperature-corrected pressure readings that accurately reflect the battery cell's internal pressure independent of thermal effects.
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 configuration allows for precise internal pressure measurement by minimizing gas flow space and correcting for temperature changes, reducing errors and ensuring accurate pressure readings during the measurement process.
Implementation Method 1
a pressure sensor for measuring a pressure of the gas discharged by operation of the gas discharge induction unit
Implementation Method 2
a temperature measuring unit configured to measure a temperature of the cylindrical battery cell
Implementation Method 3
a gas discharge induction unit configured to form a hole in the cylindrical battery cell to discharge gas inside the cylindrical battery cell
Data Source
AI summary
An internal pressure measuring jig for a cylindrical battery cell, of the present invention, comprises: a lower jig which has a form corresponding to a cylindrical battery cell, and has a temperature measuring part and a receiving groove in which the cylindrical battery cell is separably inserted; and an upper jig which discharges gas inside the cylindrical battery cell, has a pressure measuring part for measuring the pressure of the discharged gas, and is separably coupled to the lower jig so as to close off an opening part of the receiving groove.