Laminate Film Battery Sealing Structure to Prevent Side Wrinkles
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Solution Overview
Problem
The existing sealing methods for batteries, such as lithium ion secondary batteries, often result in wrinkles in the laminate film when the side surface member is smaller than the electrode body, leading to degraded sealing performance.
Innovation Solution
A battery design where a laminate film covers both the electrode body and the side surface member, with a fused part formed on the side surface member to prevent wrinkles, ensuring the outer periphery of the side surface member is positioned inside the electrode body's periphery, and the fused part is arranged continuously from the end of the laminate film to the boundary between the side surface member and the electrode body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the side surface member is made smaller than the electrode body, then the battery structure is optimized for stacking and assembly, but wrinkles are generated in the laminate film causing degraded sealing performance
Solution Approach 1:
The patent applies preliminary action by pre-forming protrusions on the laminate film at positions corresponding to where wrinkles would form during stacking. These protrusions are created before the stacking process, allowing them to prevent wrinkle formation in advance when batteries are stacked, thus maintaining sealing performance while enabling efficient stacking arrangements.
Solution Approach 2:
The patent applies local quality by creating localized protrusions only at specific positions on the laminate film where wrinkles are likely to occur during stacking, rather than modifying the entire film uniformly. This targeted approach addresses the sealing issue at critical locations while maintaining the overall stacking efficiency and structural integrity of the battery assembly.
2Area of stationary object
If the laminate film is stretched to cover the electrode body and side surface member, then complete coverage is achieved, but wrinkles are generated degrading the sealing performance
Solution Approach 1:
The patent applies preliminary action by pre-forming protrusions on the laminate film at positions corresponding to where wrinkles would form during stacking. These protrusions are created before the stacking process, allowing them to prevent wrinkle formation in advance when batteries are stacked, thus maintaining sealing performance while enabling efficient stacking arrangements.
Solution Approach 2:
The patent applies local quality by creating localized protrusions only at specific positions on the laminate film where wrinkles are likely to occur during stacking, rather than modifying the entire film uniformly. This targeted approach addresses the sealing issue at critical locations while maintaining the overall stacking efficiency and structural integrity of the battery assembly.
3Volume of moving object
If the outer periphery of the side surface member is positioned inside the electrode body periphery, then the battery structure is compact and stackable, but the laminate film cannot be properly sealed
Solution Approach 1:
The patent applies preliminary action by pre-forming protrusions on the laminate film at positions corresponding to where wrinkles would form during stacking. These protrusions are created before the stacking process, allowing them to prevent wrinkle formation in advance when batteries are stacked, thus maintaining sealing performance while enabling efficient stacking arrangements.
Solution Approach 2:
The patent applies local quality by creating localized protrusions only at specific positions on the laminate film where wrinkles are likely to occur during stacking, rather than modifying the entire film uniformly. This targeted approach addresses the sealing issue at critical locations while maintaining the overall stacking efficiency and structural integrity of the battery assembly.
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 design effectively suppresses the degradation of sealing performance by preventing wrinkles in the laminate film, even when the side surface member is smaller than the electrode body, thereby enhancing the battery's sealing efficiency and preventing breakage during stacking.
Implementation Method 1
a fused part, in which inner surfaces of the laminate film are fused, is arranged on the side surface member
Data Source
AI summary
A main object of the present disclosure is to provide a battery in which degrade in sealing performance is suppressed. The present disclosure achieves the object by providing a battery including: an electrode body; a side surface member arranged in a side surface part of the electrode body; and a laminate film that covers the electrode body, wherein; when the battery is viewed from a side surface of the side surface member, an outer periphery of the side surface member is positioned in inner side on the basis of an outer periphery of the electrode body; the laminate film is arranged to cover a surface configuring the outer periphery of the side surface member and a surface configuring the outer periphery of the electrode body; and on the side surface member, a fused part, in which inner surfaces of the laminate film are fused, is arranged.