Secondary Battery Formation Restraint to Prevent Case Deformation
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Solution Overview
Problem
The challenge of preventing plastic deformation of the battery case during initial charging of non-aqueous electrolyte solution secondary batteries, particularly when restraining a flat-shaped wound electrode body, is addressed by dynamically adjusting the restraint force based on the gas generation state during charging.
Innovation Solution
A manufacturing method that involves initial charging with varying restraint forces applied to the secondary battery assembly, increasing the force when the negative electrode potential reaches specific thresholds to manage gas generation and prevent case deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the secondary battery assembly is restrained during initial charging to prevent gas retention, then gas retention is reduced, but plastic deformation of the battery case occurs
Solution Approach 1:
The restraint force is dynamically adjusted during initial charging based on the negative electrode potential. When the potential is within the gas generation range (0.5V to 0.0V), a first restraint force is applied; when the potential is outside this range, a second restraint force (smaller than the first) is applied. This dynamic adjustment prevents gas retention during critical charging phases while avoiding excessive force that would cause battery case deformation.
Solution Approach 2:
The invention changes the restraint force parameter based on the charging state (negative electrode potential). By monitoring the potential and adjusting the restraint force accordingly, the system optimizes the balance between preventing gas retention and avoiding mechanical deformation of the battery case.
2Object-generated harmful factors
If a constant restraint force is applied throughout initial charging, then gas retention is controlled, but unnecessary restraint force causes battery case deformation
Solution Approach 1:
The restraint force transitions from static to dynamic control. The system monitors the negative electrode potential during initial charging and adjusts the restraint force in real-time, applying stronger force only when gas generation is detected (potential between 0.5V and 0.0V) and reducing force when gas generation subsides, thereby minimizing unnecessary mechanical stress on the battery case.
Solution Approach 2:
The invention implements a feedback mechanism where the negative electrode potential is continuously monitored during initial charging, and the restraint force is adjusted based on this feedback. When the potential indicates active gas generation, the system increases restraint force; when gas generation ceases, the force is reduced, creating an adaptive control system that optimizes restraint throughout the charging process.
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 prevents plastic deformation of the battery case while minimizing gas retention, thereby maintaining battery performance and structure integrity.
Implementation Method 1
during initial charging, gas derived from components contained in the secondary battery assembly may be generated in electrode body
Data Source
AI summary
Provided is a technique for preventing plastic deformation of a battery case due to restraint during initial charging. A manufacturing method disclosed herein is a manufacturing method of a non-aqueous electrolyte solution secondary battery. This method includes assembling to construct a secondary battery assembly, and initial charging of the secondary battery assembly. In the initial charging, the initial charging is started with the secondary battery assembly restrained or not restrained; when a negative electrode potential of the secondary battery assembly reaches 0.6 V, a restraint force P1 is applied to the secondary battery assembly, wherein the restraint force P1 is greater than a restraint force applied before the negative electrode potential reaches 0.6 V; and the restraint force P1 is applied to the secondary battery assembly until the negative electrode potential reaches at least 0.3 V.