Battery Laminate Sealing Structure for Terminal Corner Wrinkles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The sealing property of batteries is compromised due to wrinkles in the laminate film when the current collector terminal is smaller than the electrode body, and the low rigidity of the current collector tab leads to deformation of the laminate film under load.
Innovation Solution
A battery design featuring a fused portion where the inner surfaces of the laminate film are fused at the corner of the current collector terminal, along with an inclined surface in the laminate film, to prevent deformation and maintain sealing integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the current collector terminal is made smaller than the electrode body, then the battery size is reduced, but wrinkles occur in the laminate film and sealing property deteriorates
Solution Approach 1:
The laminate film is pre-formed with a fused portion at the corner portion of the current collector terminal before assembly. This preliminary structural preparation ensures that the film maintains proper tension and adhesion even when the terminal is smaller than the electrode body, preventing wrinkles and maintaining sealing property.
Solution Approach 2:
The laminate film has different structural characteristics at different locations: a fused portion at the corner portion of the current collector terminal for enhanced adhesion and tension control, and a smooth continuous structure at other areas. This localized structural differentiation addresses the sealing issue specifically at the critical corner region without affecting the overall battery design.
2Reliability
If the current collector tab is used to connect to the current collector terminal, then electrical connection is achieved, but the low rigidity of the tab causes laminate film deformation under load
Solution Approach 1:
The fused portion is formed in advance at the corner portion of the current collector terminal, creating a rigid anchor point before any load is applied. This preliminary structural reinforcement prevents the laminate film from deforming when load is transmitted through the low-rigidity current collector tab during battery operation.
Solution Approach 2:
The fused portion acts as a pre-prepared cushioning structure that absorbs and distributes mechanical stress before it can propagate to the laminate film. By having this reinforced corner structure in place beforehand, the film is protected from deformation caused by load-induced tab movement.
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 solution effectively suppresses deformation of the laminate film and maintains the sealing performance even when a load is applied, preventing wrinkles and ensuring the battery's integrity.
Implementation Method 1
a fused portion in which inner surfaces of the laminate film are fused to each other is disposed at a corner portion of the current collector terminal
Data Source
AI summary
A battery includes an electrode body, a current collector terminal disposed on a side surface portion of the electrode body, and a laminate film covering the electrode body. The electrode body includes a current collector tab connected to the current collector terminal. When the battery is viewed from the current collector terminal side, the outer edge of the current collector terminal is located inside the outer edge of the electrode body. The laminate film is disposed to cover surfaces constituting the outer edge of the current collector terminal and the outer edge of the electrode body. A predetermined fused portion in which inner surfaces of the laminate film, which has a predetermined inclined surface continuously formed from the first surface at a position adjacent to an electrode body side end portion of the fused portion, are fused together is disposed at a corner portion of the current collector terminal.