Battery Case Wall Deformation for Gas Release and Electrode Pressing
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Solution Overview
Problem
During the initial charging and aging of batteries, gas generated from the decomposition of electrolytic solution cannot be adequately discharged, leading to internal pressure issues and gas accumulation within the battery case, which weakens the pressing force of the case walls against the electrode body.
Innovation Solution
A method where the case walls are compressively deformed and recessed towards the electrode body after initial charging and aging, allowing gas to be expelled before permanent sealing, ensuring the case remains open to the outside for gas release and then sealed to prevent re-entry, enabling self-pressing by the case walls to maintain contact with the electrode body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the case is plastically deformed and sealed before initial charging and aging, then the case structure is established and sealed, but gas generated during initial charging and aging cannot be discharged, leading to internal pressure rise and gas accumulation
Solution Approach 1:
The case side walls are plastically deformed in advance to create a recessed shape before initial charging and aging. This preliminary structural preparation allows the case to maintain pressing force on the electrode body while enabling gas discharge pathways to function effectively during subsequent charging and aging processes.
Solution Approach 2:
The case side walls are designed to be dynamically adjustable in their pressing force. By plastically deforming the case walls to be recessed, the system creates a dynamic pressing mechanism that maintains continuous contact with the electrode body while allowing for gas volume changes during charging and aging, preventing gas accumulation without compromising sealing integrity.
2Strength
If the case walls are made rigid to maintain pressing force, then structural stability is improved, but gas discharge capability is reduced
Solution Approach 1:
The case side walls are plastically deformed to create a curved, recessed shape rather than a flat rigid surface. This curvature allows the case walls to maintain pressing force on the electrode body while creating expansion space for gas discharge, effectively combining structural strength with gas venting capability.
3Object-generated harmful factors
If initial charging and aging are performed before case sealing, then gas can be discharged during these processes, but the case remains open and contaminated
Solution Approach 1:
The case side walls are plastically deformed to create gas discharge pathways before sealing the case. This preliminary preparation ensures that gas can escape during initial charging and aging even as the case is being sealed, preventing gas accumulation without requiring the case to remain permanently open.
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 reduces gas accumulation within the battery and ensures that any generated gas during use can be easily discharged, preventing internal pressure buildup and maintaining effective contact between the case and electrode body.
Implementation Method 1
plastically deform at least one of the pair of case side walls to be recessed toward the electrode body so that the pair of case side walls continue to press the electrode body in the thickness direction even after releasing the pressing
Data Source
AI summary
A method for producing a power storage device includes: compressively deforming in which case long-side walls of the power storage device after initial charging and aging but before permanent sealing are pressed toward an electrode body to compress the electrode body and further plastically deform at least one of the case long-side walls so that the case long-side walls continue to press the electrode body even after the pressing is released; after this compressively deforming, hermetically permanently sealing the case of the power storage device in which the inside of the case is in communication with the outside; and releasing the pressing applied in the compressively deforming.