Cylindrical Battery Collector Plate Structure for Open-Core Welding
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Solution Overview
Problem
In conventional cylindrical batteries, the negative electrode can become inwardly inclined during connection to the current collector plate, leading to partial closure of the electrode assembly opening, which worsens the insertion ability of welding rods and affects welding quality, and similarly, the positive electrode can obstruct electrolyte injection due to inward inclination.
Innovation Solution
A cylindrical battery design featuring a wound electrode assembly with a current collector plate having a protrusion and groove structure that prevents inward inclination of the electrode ends, ensuring secure electrical connection and preventing obstruction during welding and electrolyte injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the negative electrode is pressed onto the negative electrode current collector plate to achieve electrical connection, then the electrical connection is improved, but the negative electrode becomes inward inclined which closes the hollow opening and worsens welding ability
Solution Approach 1:
The current collector plate is segmented into a pressing portion (for electrical connection) and a non-pressing peripheral portion (for welding), allowing differential functionality that resolves the conflict between connection reliability and manufacturing ease
Solution Approach 2:
Different regions of the current collector plate have different properties: the central pressing portion applies force for electrical connection while the peripheral portion remains flat for welding, creating local quality variations that satisfy both requirements
2Reliability
If the positive electrode is pressed onto the positive electrode current collector plate to achieve electrical connection, then the electrical connection is improved, but the positive electrode becomes inward inclined which closes the through hole and disturbs electrolyte injection
Solution Approach 1:
The current collector plate is divided into a pressing portion for electrical connection and a non-pressing peripheral portion that maintains open through-holes for electrolyte injection, resolving the conflict between connection reliability and manufacturing ease
Solution Approach 2:
The current collector plate exhibits local quality differentiation where the central region applies pressing force for electrical connection while the peripheral region remains flat to maintain through-hole openness for electrolyte injection
Data Source
AI summary
A cylindrical battery comprises: a wound electrode body having a hollow section extending in the axial direction; and collector plates, each collector plate including a protrusion having an apex accommodated in the hollow section, and a groove part provided integrally with the protrusion on the outside in the radial direction of the protrusion so as to define a groove, the collector plates being more toward the outside in the axial direction than the electrode body. In a core body of at least one of a positive and a negative electrode, a core body exposed portion without a mixture layer is joined to a core body Joining portion (an upper surface of a ridge part, and a lower surface of a ridge part of the collector plate. The core body joining portion includes an opposing part that radially opposes an integral structure comprising the protrusion and the groove part.