Cylindrical Battery Spacer With Segmented Case Contact
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Solution Overview
Problem
Conventional cylindrical batteries face issues such as reduced battery capacity, internal short-circuits, and deterioration in charge-discharge performance due to winding displacement of electrode plates during the spiraling process, which also complicates the filling of electrolyte solution.
Innovation Solution
The use of spacers with case contact portions that extend continuously from one axial end to another, providing communicating portions to prevent electrode group movement and improve electrolyte solution circulation, thereby enhancing mechanical strength and assembly efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If spacers with case contact portions are used to fix the electrode group, then electrode group stability is improved, but electrolyte solution circulation is hindered
Solution Approach 1:
The case contact portion is divided into multiple segments along the axial direction, with gaps between segments that allow electrolyte solution to pass through. This segmentation maintains the stabilizing function while enabling fluid circulation, resolving the contradiction between electrode group stability and electrolyte solution flow.
Solution Approach 2:
Different portions of the spacer have different properties: the case contact portion has gaps for electrolyte circulation, while the electrode group contact portion maintains full contact for stability. This local differentiation allows the single component to simultaneously satisfy both requirements of stabilizing the electrode group and permitting electrolyte solution circulation.
2Reliability
If spacers are used to prevent electrode group movement, then charge-discharge performance is maintained, but battery assembly complexity increases
Solution Approach 1:
The spacer serves multiple functions simultaneously: it stabilizes the electrode group against movement, maintains proper spacing for electrolyte circulation, and provides structural support within the battery case. This multi-functionality reduces the need for additional components and simplifies overall assembly while maintaining charge-discharge performance.
Solution Approach 2:
The case contact portion and electrode group contact portion are merged into a single integrated spacer component rather than separate parts. This merging simplifies assembly by reducing the number of components to be installed while maintaining both the stabilizing and spacing functions necessary for reliable charge-discharge performance.
3Strength
If the case contact portion extends continuously from one axial end to another, then mechanical strength is improved, but electrolyte solution filling becomes difficult
Solution Approach 1:
The continuous case contact portion is segmented into multiple sections with gaps between them, allowing electrolyte solution to flow through the spacer structure during filling. This segmentation maintains sufficient mechanical strength for structural support while enabling easy electrolyte solution filling without requiring gradual multi-step processes.
Data Source
AI summary
A cylindrical battery including: a battery case having a cylindrical shape; an electrode group disposed in the battery case, including a positive electrode, a negative electrode, and a separator, and having a pair of flat outer side surfaces opposed to each other; and a spacer disposed between an inner peripheral surface of the battery case and each of the flat outer side surfaces of the electrode group. The spacer has a case contact portion that extends continuously from a first axial end to a second axial end and is in contact with the inner peripheral surface of the battery case, and the case contact portion is formed with a communicating portion that communicates spaces partitioned by the case contact portion.