Battery Cell End Cover Structure for Recessed Electrode Terminals
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Solution Overview
Problem
The capacity of lithium-ion batteries is limited by the structure of the battery cell, particularly due to the protruding length of the electrode terminal which occupies excessive space.
Innovation Solution
The end cover of the battery cell incorporates a first convex portion with a recessed first concave portion to accommodate the electrode terminal, reducing its protrusion and optimizing space utilization within the housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode terminal protrudes from the end cover, then electrical connection is achieved, but the battery cell volume increases and capacity is reduced
Solution Approach 1:
The electrode terminal is nested within the concave portion of the end cover, allowing the terminal to be housed inside the cover structure rather than protruding externally. This nesting arrangement reduces the overall battery cell volume while maintaining the electrical connection function.
Solution Approach 2:
The end cover incorporates a concave portion that creates an internal cavity dimension, allowing the electrode terminal to be positioned in three-dimensional space within the cover rather than extending linearly from the external surface. This dimensional reorganization reduces the battery cell's external dimensions.
2Reliability
If the electrode terminal protrudes from the end cover, then electrical connection is achieved, but the space utilization within the housing is reduced
Solution Approach 1:
The electrode terminal is nested within the concave portion of the end cover, allowing the terminal to be housed inside the cover structure rather than protruding externally. This nesting arrangement reduces the overall battery cell volume while maintaining the electrical connection function.
3Ease of manufacture
If the end cover structure is simplified without a concave portion, then manufacturing is easier, but the electrode terminal occupies excessive space
Solution Approach 1:
The end cover features a localized concave portion specifically at the electrode terminal accommodation area, while the rest of the cover maintains a simple flat structure. This local modification minimizes manufacturing complexity while achieving the space-saving benefit of reduced terminal protrusion.
Solution Approach 2:
The end cover design incorporates a controlled geometric parameter change by adding a concave portion with specific depth and dimensions, allowing optimization of the terminal accommodation space without fundamentally changing the manufacturing process or overall cover structure.
Data Source
AI summary
An embodiment of the present application provides a battery cell, a battery, a power consumption device, and a manufacturing equipment and method for a battery cell. The battery cell includes a housing, an electrode assembly, an end cover to cover the housing, and an electrode terminal installed on the end cover and electrically connected with the electrode assembly. The end cover includes a first body and a first convex portion, and the first convex portion extends from the first inner surface of the first body along a direction facing the electrode assembly, a position on the first body corresponding to the first convex portion is formed with a first concave portion recessed from the first outer surface opposite to the first inner surface along the direction facing the electrode assembly, the first concave portion is configured to accommodate the electrode terminal. The battery cell can effectively increase the battery capacity.