Method for manufacturing secondary battery and secondary battery
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Solution Overview
Problem
Existing methods for manufacturing secondary batteries struggle to ensure that the inside of the electrode assembly is sufficiently osmosed with electrolytic solution while maintaining vibration resistance.
Innovation Solution
A method involving an assembly producing step, an electrode assembly accommodating step, an electrolytic solution liquid injection step, an electrolytic solution osmosing step, and a shrink pack heat-shrinking step, where the electrolytic solution is injected into a shrink pack, osmosed into the electrode assembly, and the pack is heat-shrunk to fix the assembly and enhance vibration resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shrink tube is subjected to heat shrink before electrolytic solution osmosis, then the vibration resistant property is enhanced, but the electrolytic solution cannot sufficiently osmose into the electrode assembly
Solution Approach 1:
The patent applies preliminary action by performing the electrolytic solution osmosis step before the heat shrink step. The electrode assembly is first inserted into the shrink tube, then electrolytic solution is injected and allowed to osmose into the electrode assembly through the separator. Only after this osmosis is complete is the heat shrink applied to seal and secure the assembly. This sequencing ensures that the electrolytic solution can fully penetrate the electrode structure before the tube contracts, resolving the contradiction between achieving complete osmosis and maintaining vibration resistance.
2Reliability
If the shrink tube is used to fix the electrode assembly, then the vibration resistant property is improved, but the electrolytic solution injection and osmosis becomes difficult
Solution Approach 1:
The patent performs the electrolytic solution injection and osmosis steps before applying the heat shrink to the shrink tube. This preliminary action allows the electrolytic solution to be freely injected and osmose into the electrode assembly without the constraint of the already-shrunk tube, making the manufacturing process easier while still achieving the vibration resistance benefit of the shrunk tube.
Solution Approach 2:
The manufacturing process is segmented into distinct sequential steps: (1) inserting the electrode assembly into the shrink tube, (2) injecting the electrolytic solution, (3) allowing osmosis to occur, and (4) applying heat shrink. This segmentation allows each step to be optimized independently, with the injection and osmosis steps performed when access is easiest, before the tube is sealed and secured.
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 osmoses the electrolytic solution into the electrode assembly and provides a secondary battery with enhanced vibration resistance by fixing the electrical collector terminals and electrode assembly with the heat-shrunk shrink pack.
Implementation Method 1
a shrink pack heat-shrinking step for making the shrink pack be subjected to a heat shrink
Implementation Method 2
an electrolytic solution osmosing step for osmosing the electrolytic solution to an inside of the electrode assembly
Data Source
AI summary
The technique disclosed herein relates to a method for manufacturing a secondary battery, and includes an assembly producing step for producing an assembly in which an electrical collector terminal and an electrode assembly are connected, an electrode assembly accommodating step for accommodating the electrode assembly in an inside of a shrink pack that includes an upper opening and that is formed in a bag shape, an electrolytic solution liquid injection step for injecting an electrolytic solution to the inside of the shrink pack, an electrolytic solution osmosing step for making the electrolytic solution osmose to an inside of the electrode assembly, and a shrink pack heat-shrinking step for making the shrink pack be subjected to a heat shrink.