Cylindrical Battery Cell Current Collector Positioning for Stable Welding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge in cylindrical battery cell manufacturing is achieving stable conductivity between the current collector and the housing due to relative displacement in the radial direction, leading to poor welding quality.
Innovation Solution
A cylindrical battery cell design featuring a housing with a rolling groove and a current collector connected via a connection arm, where positioning portions on the housing connection portion and/or connection arm limit radial displacement, ensuring accurate positioning and stable contact between the current collector and the housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the housing connection portion is pressed tightly against the welding plane using tooling pressure, then the welding connection is achieved, but relative displacement occurs in the radial direction causing poor welding quality
Solution Approach 1:
The patent applies preliminary action by pre-forming a positioning groove on the welding plane before the welding process. This groove预先 (in advance) receives and constrains the positioning protrusion of the current collector, ensuring accurate radial positioning is established before welding pressure is applied, thereby preventing relative displacement during the welding process.
Solution Approach 2:
The patent introduces an intermediary mechanism - the positioning groove and positioning protrusion interface - that mediates between the current collector and the housing connection portion. This intermediary structure ensures precise radial alignment and maintains stable contact during pressing, eliminating the relative displacement that causes poor welding quality.
2Reliability
If the current collector is connected to the housing through pressing, then electrical connection is achieved, but relative displacement affects the stability of current-carrying capability
Solution Approach 1:
The positioning groove is pre-formed on the housing to receive the positioning protrusion before the pressing operation. This preliminary positioning action ensures that when tooling pressure is applied to achieve electrical connection, the current collector maintains stable radial contact with the housing, preventing displacement that would compromise current-carrying capability stability.
Solution Approach 2:
The positioning groove-protrusion interface acts as an intermediary constraint that stabilizes the contact between the current collector and housing. This intermediary mechanism ensures consistent radial positioning during and after pressing, maintaining stable electrical connection and reliable current-carrying capability throughout operation.
Data Source
AI summary
Disclosed are a cylindrical battery cell, a battery assembly and an electronic device. The cylindrical battery cell includes a housing, an electrode assembly and a current collector. The housing includes an opening, and a rolling groove is formed on the side wall of the opening. The electrode assembly is sealed and disposed in the housing, and the rolling groove limits the movement of the electrode assembly in the axial direction. A first tab is disposed on one side of the electrode assembly facing the opening. The current collector is disposed in the housing, and the current collector includes a housing connection portion connected to one side of the rolling groove facing away from the electrode assembly and a tab connection portion connected to the first tab. A positioning portion is disposed on the housing connection portion to limit displacement of the housing connection portion in the radial direction.