Secondary Battery Protection Layer for Weld Corrosion Control
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Solution Overview
Problem
Existing secondary battery technologies face challenges in protecting welds and internal surfaces from corrosion and short circuits, leading to safety hazards and reduced reliability due to inadequate protection methods that are complex, costly, and prone to damage during manufacturing.
Innovation Solution
A protection method involving a gas-solid interface reaction technology that forms a protection layer on the internal surfaces and welds of secondary batteries by evacuating and introducing specific reactants through an injection opening, using a first reactant and a second reactant that react to form a uniform, dense protection layer, reducing corrosion and short circuit risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional protection methods are used for welds and internal surfaces, then manufacturing complexity and cost increase, but protection effectiveness is insufficient leading to corrosion and short circuits
Solution Approach 1:
The patent replaces complex mechanical protection methods with a chemical reaction-based protection layer formation process. By introducing reactants that chemically react to form protective layers on welds and internal surfaces, the method eliminates the need for multiple mechanical protection steps while achieving reliable corrosion and short circuit prevention
Solution Approach 2:
The patent changes the physical and chemical parameters of the battery internal environment by controlling pressure, temperature, and reactant concentration during the protection layer formation process. This allows the formation of dense, uniform protection layers that provide reliable protection without requiring complex manufacturing procedures
2Reliability
If protective layers are formed on internal surfaces, then corrosion resistance improves, but manufacturing process complexity increases
Solution Approach 1:
The patent combines multiple protection functions into a single integrated process by forming protection layers on both welds and internal surfaces simultaneously through the introduction of reactants. This merging of protection functions eliminates the need for separate protection steps for different components, simplifying the overall manufacturing process while maintaining comprehensive corrosion resistance
Solution Approach 2:
The protection layer formation process is designed to occur automatically within the battery structure using introduced reactants that self-assemble and react on contact with internal surfaces and welds. This self-service approach eliminates the need for complex external application equipment and manual intervention, making the process easier to manufacture
3Manufacturing precision
If gas-solid interface reaction technology is used, then protection layer quality improves, but process time and complexity increase
Solution Approach 1:
The patent employs periodic introduction and evacuation cycles of reactants to form high-quality protection layers. By repeatedly introducing reactants, allowing reaction, then evacuating and repeating the process, the method builds up dense, uniform protection layers with excellent quality while managing the total process time through efficient cycling
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
The method effectively reduces the probability of corrosion and short circuits, enhancing safety performance and corrosion resistance while maintaining energy density and simplifying the manufacturing process by forming a robust protection layer on internal surfaces and welds.
Implementation Method 1
the gas-solid interface reaction technology is used to protect the internal surface of the secondary battery
Data Source
AI summary
A protection method for a secondary battery includes evacuating the secondary battery through an injection opening of the secondary battery to within 100 kPa, introducing a first reactant into the secondary battery through the injection opening until a pressure of the secondary battery rises by more than 1 Pa and maintaining the pressure for more than 1 ms, evacuating the secondary battery through the injection opening to within 100 kPa, and introducing a second reactant into the secondary battery through the injection opening until the pressure rises by more than 1 Pa and maintaining the pressure for more than 1 ms, thereby forming a protection layer on an internal surface of the secondary battery.