Cylindrical Battery Tab Structure for Shell Short-Circuit Isolation
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Solution Overview
Problem
The existing cylindrical battery cells are prone to short circuits due to the tab potentially lapping with the shell, which can lead to safety issues during use.
Innovation Solution
The design incorporates a tab with a first and second portion, where the second portion surrounds the first portion and is isolated by a separator from the shell. The first portion extends beyond the separator, while the second portion does not, reducing the likelihood of short circuits. Additionally, a first insulating member with a recess accommodates the first portion, and a second insulating member surrounds the first and second portions to further prevent external conductive impurities from causing short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tab extends beyond the separator to facilitate electrical connection, then the electrical connectivity is improved, but the risk of short circuit with the shell increases
Solution Approach 1:
The tab is divided into two distinct portions: a first portion that extends beyond the separator for electrical connection, and a second portion that is surrounded by the separator and does not extend beyond it. This segmentation allows the tab to fulfill its electrical function while preventing harmful contact with the shell.
Solution Approach 2:
The separator acts as an intermediary insulating layer between the tab and the shell. By wrapping the second portion of the tab, the separator provides electrical isolation that prevents short circuits while allowing the first portion to maintain electrical connectivity when needed.
2Ease of manufacture
If the tab structure is simplified for ease of manufacture, then the manufacturing complexity is reduced, but the protection against short circuit is weakened
Solution Approach 1:
The separator is pre-configured to wrap around the second portion of the tab before final assembly. This preliminary arrangement ensures that the protective insulating structure is already in place, providing short circuit protection without requiring complex additional manufacturing steps.
Solution Approach 2:
The second portion of the tab is nested within the wrapping of the separator, creating a compact structure where the insulating layer is integrated around the conductive element. This nested configuration provides protection while maintaining manufacturing simplicity.
Data Source
AI summary
A cylindrical battery cell, a battery, an electricity consuming device, a manufacturing method and a manufacturing system are provided. The cylindrical battery cell includes a shell, including an opening; and an electrode assembly, disposed in the shell, the electrode assembly including a separator and a tab, and along an axial direction of the electrode assembly, the tab being located at one end of the electrode assembly and extending toward the opening, the tab including a first portion and a second portion, the second portion surrounding a periphery of the first portion, and the separator wrapping the second portion to isolate the second portion from the shell, wherein along the axial direction, the first portion extends beyond the second portion and the separator, and the second portion does not extend beyond the separator. The battery cell of the present application solves a problem of short circuit in the battery cell.