Battery Cell Top Cover Structure for Low Resistance and Isolation
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Solution Overview
Problem
Current battery technologies face challenges in improving battery performance, particularly in reducing internal resistance and preventing short circuits while maintaining a compact design and reliable electrical connections.
Innovation Solution
A battery cell design featuring an integrally formed top cover plate as an electrode lead-out portion, combined with an insulating portion that includes multiple insulating parts to ensure electrical insulation and isolation, reducing the risk of short circuits and enhancing electrical connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an integrally formed top cover plate is used as an electrode lead-out portion, then electrical connection area is increased and internal resistance is reduced, but the risk of short circuit between the top cover plate and housing increases
Solution Approach 1:
An insulating portion is introduced as an intermediary element between the top cover plate and the housing. This insulating portion includes a first insulating part located between the opening portion and the top cover plate, and a second insulating part covering the opening end surface of the bent structure. The insulating portion acts as a mediator that maintains electrical isolation while allowing the top cover plate to serve as an electrode lead-out portion with large connection area.
2Reliability
If the top cover plate is made with large electrical connection area, then internal resistance is reduced, but the space occupied by the battery cell increases
Solution Approach 1:
The top cover plate is designed to serve multiple functions simultaneously: it acts as both the closure for the opening portion of the housing and as the electrode lead-out portion for electrical connection. This multi-functional design allows the battery cell to achieve large electrical connection area without requiring additional separate components that would increase overall volume.
Solution Approach 2:
The functions of the cover plate and the electrode lead-out structure are merged into a single integrally formed top cover plate. This consolidation eliminates the need for separate components and their associated mounting spaces, thereby reducing the overall battery cell volume while maintaining effective electrical connection area.
3Strength
If the bent structure with retaining cavity is used to retain the top cover plate, then structural strength and rigidity are improved, but the manufacturing complexity increases
Solution Approach 1:
The retaining cavity structure is integrated directly into the bent structure of the housing opening portion, forming a unified component. This merging of the retaining function into the existing structural element avoids the need for separate retaining mechanisms or additional manufacturing steps, thereby reducing manufacturing complexity while maintaining high structural strength and rigidity.
Data Source
AI summary
A battery cell, a battery, and a power consuming apparatus. The battery cell includes: an electrode assembly, including a main body portion and a tab, where the tab is led from at least one end that is of the main body portion and that is in a first direction; a shell, having a cavity that accommodates the electrode assembly, where the shell includes a housing and a top cover plate, at least one end that is of the housing and that is in the first direction has an opening portion, the top cover plate covers the opening portion, and the tab is electrically connected to the top cover plate; and an insulating portion, at least partially disposed at the opening portion, and including a first insulating part located between the opening portion and the top cover plate.