Secondary Battery Outer Package for Uniform Electrode Pressure
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Solution Overview
Problem
Non-aqueous electrolyte secondary batteries face issues with non-uniform pressing force applied to the electrode body, leading to increased contact resistance and decreased battery performance, especially in vacuum environments, necessitating larger battery sizes to compensate.
Innovation Solution
A secondary battery design with an outer package that applies a substantially uniform pressing force to the electrode body through elastic means, utilizing a laminated pack under negative pressure to reduce contact resistance and enhance performance without additional configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a guide plate is used to press the electrode body, then the electrode body is pressed at a constant pressure, but the pressing force is not uniform between the opening side and side plate connection side
Solution Approach 1:
The outer package is divided into multiple elastic members (first elastic member at opening side, second elastic member at side plate connection side) that independently apply pressing force. This segmentation allows each elastic member to be optimized for its specific location, achieving uniform pressing force distribution across the electrode body while maintaining constant pressure.
2Reliability
If the contact resistance in the electrode body is not sufficiently decreased, then battery performance decreases, but increasing the size of the secondary battery is necessary to compensate
Solution Approach 1:
The elastic members are pre-configured within the outer package to automatically apply uniform pressing force to the electrode body during assembly. This preliminary action ensures optimal contact resistance is achieved before the battery is put into service, eliminating the need for additional size to compensate for poor contact.
3Adaptability or versatility
If the electrode body is used in a vacuum atmosphere, then atmospheric pressure is not applied to the electrode body, but contact resistance increases and battery performance decreases
Solution Approach 1:
The elastic members are designed to self-generate pressing force through their elastic properties, requiring no external power source or control system. This self-service mechanism ensures consistent pressing force is maintained in vacuum environments where atmospheric pressure assistance is unavailable, preserving battery performance across different operating conditions.
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 uniform pressing force reduces contact resistance within the electrode body, improving battery performance and enabling downsizing by leveraging the elastic force of the outer package and pressure differences within the laminated pack.
Implementation Method 1
the outer package substantially uniformly applies pressing force to each of the front surface and the rear surface of the content due to the elastic force of the outer package
Implementation Method 2
the inside of the outer package is under a negative pressure, and, inside the outer package, the inside of the laminated pack is under a lower pressure than the outside of the laminated pack
Data Source
AI summary
The present invention includes an outer package and contents accommodated in the outer package. The contents include an electrode body. The outer package substantially uniformly applies pressing force to each of the front surface and the rear surface of the contents due to the elastic force of the outer package.