Battery Cell Terminal Recess Structure for Easier Assembly
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Solution Overview
Problem
The existing battery cell manufacturing process faces challenges in efficiently assembling the electrode terminal, leading to poor contact with bus components, increased stress concentration, and risk of deformation during shaping.
Innovation Solution
A battery cell design that includes a recess at the end of the electrode terminal, with a side wall that is bent outward to fix the terminal to the casing, reducing pressure and stress concentration, and improving the connection strength between the current collecting member and the electrode terminal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the electrode terminal is directly mounted to the casing without a recess structure, then the assembly process is simpler, but the contact with bus components is poor and stress concentration increases
Solution Approach 1:
The recess is pre-formed on the electrode terminal before mounting to the casing. This preliminary structural preparation allows the terminal to be properly positioned and contacted with bus components while distributing stress during the subsequent assembly process, resolving the contradiction between assembly simplicity and contact quality.
Solution Approach 2:
The recess acts as an intermediary structure between the electrode terminal and the bus components. It provides a dedicated space that facilitates proper contact and stress distribution, mediating the interaction between these components to improve both contact quality and stress management.
2Manufacturing precision
If the electrode terminal is subjected to high pressure during shaping to ensure proper contact, then the contact quality improves, but deformation risk increases
Solution Approach 1:
The recess creates a localized area on the electrode terminal with different mechanical properties. This local structural modification allows for controlled deformation in the recess area during shaping while maintaining the overall strength of the terminal, enabling proper contact without excessive global pressure that would cause deformation.
Solution Approach 2:
The recess is pre-formed to create a compliant zone that can accommodate shaping operations. This preliminary preparation allows the terminal to be shaped with lower pressure, reducing the risk of deformation while still achieving proper contact quality in the final assembly.
3Reliability
If the electrode terminal uses a complex fixing structure to reduce stress concentration, then stress distribution improves, but the assembly difficulty increases
Solution Approach 1:
The electrode terminal is segmented into distinct functional zones: the recess area for stress distribution and contact, the body portion for structural support, and the limiting portion for positioning. This segmentation allows each part to perform its specific function efficiently, achieving good stress distribution without requiring an overly complex overall structure.
Solution Approach 2:
The fixing structure uses local quality variations through the recess geometry. The recess provides localized stress distribution capability where needed, while the rest of the terminal maintains a simpler form. This targeted approach achieves reliable stress management without comprehensive structural complexity throughout the entire component.
Data Source
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AI summary
Embodiments of the present application provide a battery cell, a method and a system for manufacturing the battery cell, a battery, and an electrical device. The battery cell provided by the embodiments of the present application include: an electrode assembly comprising a first tab; a casing for accommodating the electrode assembly, the casing comprising a wall provided with an electrode lead-out hole; an electrode terminal mounted at the electrode lead-out hole; and a current collecting member positioned between the wall and the first tab and configured to connect the electrode terminal and the first tab. A first recess is provided at an end of the electrode terminal that faces the first tab, a side wall of the first recess is bent outward so that the electrode terminal is fixed to the wall, and the current collecting member is abutted against and connected to a bottom surface of the first recess. The present application can reduce the difficulty of the assembling of the electrode terminal, and improve the assembly process of the battery cell.