Battery Electrolyte Injection Vacuum Control
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Solution Overview
Problem
In the manufacturing of batteries with liquid electrolytes, repeated injection processes lead to electrolyte volatilization and residual electrolyte in the injection chamber, causing incomplete depressurization, excessive injection amounts, and potential leakage during sealing, which affects impregnation and gas exhaustion.
Innovation Solution
Measure the vacuum attainment time in the liquid injecting chamber to adjust the depressurization rate and time of the sealing vacuum pump, reducing the risk of electrolyte leakage and improving gas exhaustion by extending the depressurization time when electrolyte remains, while providing a warning for chamber cleaning when the time exceeds a certain threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the liquid electrolyte is injected in the vacuum state to improve permeability, then the impregnation of the liquid electrolyte is improved, but the liquid electrolyte is volatilized and remains in the liquid injecting chamber
Solution Approach 1:
The patent introduces a preliminary blowing step before the injection step, where compressed gas is supplied to blow out residual electrolyte from the chamber. This preliminary action prevents the accumulation of volatilized electrolyte that would otherwise interfere with subsequent injection operations and vacuum attainment
Solution Approach 2:
The patent implements a continuous cycle of injection followed by blowing and vacuum depressurization. After each injection, the blowing step immediately removes residual electrolyte, and the vacuum pump continues to depressurize the chamber, ensuring the system is always ready for the next injection without interruption or performance degradation
2Manufacturing precision
If the injection is repeated to ensure sufficient impregnation, then the impregnation quality is improved, but the vacuum attainment time becomes longer and depressurization becomes insufficient
Solution Approach 1:
The patent uses a high-speed blowing step with compressed gas to rapidly remove residual electrolyte from the chamber between injections. This skipping action quickly clears the chamber of interfering substances, allowing the vacuum pump to rapidly attain the required vacuum degree without being delayed by prolonged volatilization of accumulated electrolyte
Solution Approach 2:
The patent implements periodic cycles of injection followed by blowing and vacuum depressurization. Each cycle is self-contained and resets the chamber condition, allowing repeated injections to be performed with consistent vacuum attainment times rather than progressively longer times
3Productivity
If the depressurization is performed quickly to maintain productivity, then the production efficiency is improved, but the liquid electrolyte boils sharply and leaks out during sealing
Solution Approach 1:
The patent introduces a preliminary blowing step that actively removes residual electrolyte from the chamber before the sealing process begins. This preliminary anti-action prevents the electrolyte from being present in quantities that would cause sharp boiling and leakage during subsequent depressurization and sealing operations
Solution Approach 2:
The blowing step acts as a cushioning measure before sealing, removing the harmful residual electrolyte that would otherwise cause problematic boiling during the transition to sealing. This beforehand removal creates a safer condition for the subsequent rapid depressurization and sealing process
4Quantity of substance
If the injection amount is increased to compensate for volatilization, then the impregnation quantity is improved, but the excess liquid electrolyte remains at the opening portion and causes leakage
Solution Approach 1:
The patent uses the blowing step to extract and remove excess residual electrolyte from the chamber after injection. This extraction action removes the harmful surplus electrolyte that would otherwise remain at the opening portion and cause leakage during sealing, while allowing the necessary impregnation quantity to be achieved during the injection step
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 method effectively suppresses electrolyte leakage during sealing, enhances impregnation, and accelerates gas exhaustion, maintaining production efficiency by adjusting the depressurization process based on measured vacuum times.
Implementation Method 1
In the injection in the vacuum state, the liquid electrolyte is inevitably volatilized
Implementation Method 2
By depressurizing the inside of this sealing chamber to the predetermined vacuum state, after exhausting a gas remaining inside the outer case body
Data Source
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AI summary
The present invention has a first depressurization step of depressurizing the inside of a liquid injecting chamber, an injection step of injecting, in the inside of the liquid injecting chamber, a liquid electrolyte into the battery through an opening portion formed at the top end of an outer case body of the battery, a second depressurization step of depressurizing the inside of a sealing chamber and a sealing step of sealing the opening portion in the inside of the sealing chamber. Vacuum attainment time ΔT until the pressure of the inside of the liquid injecting chamber becomes at a predetermined vacuum degree is measured in the first depressurization step, and if this vacuum attainment time ΔT exceeds first threshold ΔTs1, a depressurization rate is reduced and a depressurization time is extended.