Secondary Battery Gas Pressure Measurement Without Electrolyte Contamination
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Solution Overview
Problem
Conventional apparatuses struggle to accurately measure gas pressure in secondary batteries during the formation process due to electrolyte overflow, which contaminates the measurement and interferes with gas pressure detection.
Innovation Solution
An apparatus comprising a buffer to collect electrolyte, a gas storage to collect gas, and a gas pressure measurement device positioned higher than the buffer, along with a controller to manage valves and a vacuum pump for gas discharge, allowing separate collection and measurement of gas pressure without electrolyte contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional gas pressure measurement apparatus is used during battery formation process, then gas pressure measurement is attempted, but electrolyte overflows through liquid injection port contaminating the measurement and making accurate measurement difficult
Solution Approach 1:
The apparatus separates the measurement system into two distinct parts: a buffer chamber that collects electrolyte and a gas storage chamber that collects gas. This segmentation prevents electrolyte from reaching the pressure sensor while allowing gas pressure measurement, thus resolving the contamination problem while maintaining measurement accuracy
Solution Approach 2:
The buffer acts as an intermediary component between the battery's liquid injection port and the gas storage. It intercepts electrolyte before it can contaminate the gas storage or pressure sensor, enabling accurate gas pressure measurement by mediating the interaction between electrolyte and gas collection systems
2Reliability
If gas pressure measurement is performed during formation process, then gas characteristics can be determined, but electrolyte overflow interferes with the measurement process
Solution Approach 1:
The measurement apparatus is divided into functionally separate components: buffer for electrolyte management, gas storage for gas collection, and pressure sensor for measurement. This segmentation isolates the sensitive measurement function from the messy electrolyte environment, improving reliability while keeping the overall device structure manageable
Solution Approach 2:
The buffer serves multiple functions: it collects electrolyte, prevents contamination, and facilitates gas collection. This multi-functionality reduces the need for additional separate components, thereby improving measurement reliability without significantly increasing device complexity
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 precise gas pressure measurement during the formation process, preventing accidents by setting optimal conditions and ensuring the apparatus operates efficiently by separating electrolyte and gas, facilitating safe and controlled battery formation.
Implementation Method 1
a vacuum pump connected to the second connection pipe, and a controller configured to control the first valve, the second valve, and the vacuum pump
Implementation Method 2
the vacuum pump is configured to discharge the gas stored in the gas storage to outside of the apparatus
Data Source
AI summary
An apparatus is provided for measuring gas pressure of a secondary battery. The apparatus includes a buffer configured to be coupled to a liquid injection port of the secondary battery and configured to store an electrolyte discharged from an inside of the secondary battery, a gas storage connected to the buffer and configured to store gas discharged from the inside of the secondary battery, and a gas pressure measurement device connected to the gas storage and configured to measure a pressure of the gas.