Flattened Electrode Assembly Load Distribution via Sheet Member
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Solution Overview
Problem
In energy storage devices with flattened wound electrode assemblies, the load distribution is uneven due to concentrated pressure on curved surface portions and insufficient load on flat portions, especially when the case is under negative pressure, making it difficult to adjust the load effectively.
Innovation Solution
Incorporating a sheet-like member between the electrode assembly and the case, which is in a negative pressure state, to ensure contact only with the flat portion, thereby alleviating the load on curved surface portions and applying a larger load to the flat portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the entire side surface of the flattened wound electrode assembly is pressed, then the charge-discharge efficiency is improved, but the load is concentrated on the curved surface portion and the load on the flat portion becomes insufficient
Solution Approach 1:
The pressing mechanism applies different loads to different portions of the electrode assembly. Specifically, the curved surface portion is pressed with a first load while the flat portion is pressed with a second load that is larger than the first load. This local differentiation of pressing force optimizes the contact between electrodes without concentrating excessive stress on the curved regions, thereby improving charge-discharge efficiency while maintaining proper load distribution.
2Force
If the method of keeping the inside of the case at a negative pressure is used, then the electrode assembly is compressed, but it is difficult to locally deform the case and adjust the magnitude of the load for each portion
Solution Approach 1:
A pressing mechanism is introduced as an intermediary component between the case and the electrode assembly. This pressing mechanism includes a pressing member that can be selectively positioned to press either the curved surface portion or the flat portion of the electrode assembly. By using this intermediary device, the system achieves both the compression effect of negative pressure and the ability to adjust load distribution, overcoming the limitation of the pure negative pressure method.
3Force
If a sheet-like member is disposed between the electrode assembly and the case, then the load on the curved surface portion is suppressed and the load on the flat portion is increased, but the structure becomes more complex
Solution Approach 1:
A sheet-like member is disposed between the electrode assembly and the case to achieve differential load distribution. The sheet-like member is configured to contact primarily the flat portion of the electrode assembly, allowing the case to apply pressure while the sheet redistributes the load to prevent excessive stress on curved portions. This thin film approach adds minimal structural complexity while effectively solving the load distribution problem.
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 configuration allows for uniform load distribution across the electrode assembly, reducing the load on curved surface portions and increasing the load on flat portions, enhancing the overall performance of the energy storage device.
Implementation Method 1
when an inside of the case is in a negative pressure state, the electrode assembly is in a state of being pressed by the case with the sheet-like member interposed therebetween
Data Source
AI summary
One aspect of the present invention is an energy storage device including: a flattened electrode assembly formed by winding a belt-like electrode in a longitudinal direction thereof and including two curved surface portions and a flat portion located between the two curved surface portions; a case housing the electrode assembly; and a sheet-like member disposed between the electrode assembly and the case, in which when an inside of the case is in a negative pressure state, the electrode assembly is in a state of being pressed by the case with the sheet-like member interposed therebetween, and the sheet-like member is in contact only with the flat portion with respect to the electrode assembly.