Battery Cell Support Piece for Tab Restraint and Short-Circuit Prevention
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Solution Overview
Problem
Battery safety is compromised due to the risk of short circuits between positive and negative electrodes, primarily caused by the tabs of the electrode assembly moving within the battery cell, leading to potential electrical shorts.
Innovation Solution
A support piece is strategically positioned between the electrode assembly's main body and the end cover assembly, with the tabs bent around it to prevent movement and insertion, thereby reducing the risk of short circuits and enhancing safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the tabs are allowed to move freely within the battery cell, then the ease of assembly is improved, but the safety deteriorates due to risk of short circuits between positive and negative electrodes
Solution Approach 1:
A support piece is introduced as an intermediary component between the tabs and the end cover assembly. The support piece includes a support portion that contacts the tabs and a partition portion that prevents the tabs from moving into the main body. This intermediary structure restricts tab movement while maintaining ease of assembly, thereby preventing short circuits and improving safety without complicating the manufacturing process.
2Reliability
If the support piece structure is added to restrict tab movement, then the safety is improved, but the device complexity increases
Solution Approach 1:
The support piece is segmented into two functional portions: a support portion for contacting and restricting the tabs, and a partition portion for preventing tab insertion into the main body. This segmentation allows each portion to perform its specific function efficiently while keeping the overall structure simple and easy to manufacture, thus improving safety without significantly increasing device complexity.
3Reliability
If the tabs are bent around the support piece, then the risk of short circuit is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The support piece is pre-installed in the end cover assembly before the tabs are bent. This preliminary action provides a physical guide for the tab bending process, ensuring that the tabs are bent around the correct location and shape. The pre-positioned support piece reduces the precision requirements during the bending operation, as the tabs naturally follow the contours of the support piece, thereby maintaining reliability while reducing manufacturing precision demands.
Data Source
AI summary
The embodiments of this application provide a battery cell, a battery, an electrical device, and a battery cell manufacturing method and device, which pertains to the technical field of batteries. The battery cell includes an electrode assembly, a housing, an end cover assembly, and a support piece. The electrode assembly includes a main body and tabs. The housing has an opening and is used to accommodate the electrode assembly. The end cover assembly is used to cover the opening. The support piece is located between the main body and the end cover assembly, the tabs are bent around the support piece, and the support piece is configured to prevent the main body from moving along a direction facing the end cover assembly.