Cylindrical Electrode Assembly With Bent Tabs to Prevent Short Circuits
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Solution Overview
Problem
The safety of cylindrical battery cells is compromised by the rubbing and flattening process, which generates metal particles that can cause internal short circuits due to tab insertion and metal particle fallouts.
Innovation Solution
A coiled cylindrical electrode assembly with independently bent tabs that are electrically connected to the electrode lead-out parts, reducing the need for rubbing and flattening, thereby minimizing metal particle generation and enhancing safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the rubbing and flattening process is used to process the first tab, then the first tab can be electrically connected to the electrode lead-out part, but metal particles are generated that can cause internal short circuits
Solution Approach 1:
The patent extracts and eliminates the harmful rubbing and flattening process from the manufacturing procedure. Instead of using mechanical rubbing to connect the tab to the lead-out part, the invention uses a bending process that avoids generating metal particles, thereby removing the source of the harmful effect while preserving the electrical connection function.
Solution Approach 2:
The patent converts the harmful mechanical rubbing process into a beneficial bending process. By bending the tab in a controlled manner, the same goal of electrical connection is achieved without the harmful side effect of metal particle generation. The bending process actually benefits from the tab's natural flexibility rather than fighting against it through aggressive rubbing.
2Ease of manufacture
If the rubbing and flattening process is used on the first tab, then the tab can be inserted and connected, but the tab surface becomes wrinkled and metal particles are generated
Solution Approach 1:
The patent replaces the mechanical rubbing and flattening system with a bending system. Instead of using friction-based mechanical contact to shape and position the tab, the invention uses controlled bending forces that maintain surface integrity while achieving the necessary tab deformation for proper insertion and connection.
3Volume of moving object
If the first tab is bent toward the first end face, then the height of the first tab is reduced and space is optimized, but the tab must be processed without rubbing to avoid metal particles
Solution Approach 1:
The patent performs the bending action as a preliminary step before the tab is inserted into the battery assembly. By pre-bending the tab to the required angle and position, the tab is prepared in advance to fit into the available space without requiring subsequent rubbing or adjustment operations that could generate metal particles. This preliminary shaping simplifies the overall manufacturing process.
Data Source
AI summary
A cylindrical electrode assembly of a coiled structure includes a main body and a first tab. The main body is provided with a first end face, and the first tab extends out of the first end face and is bent toward the first end face.