Battery Cell Venting Layout for Easier Tab Lead-Out Assembly
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Solution Overview
Problem
Existing battery cells face manufacturing difficulties that hinder production efficiency, particularly due to the challenge of integrating a pressure relief portion and electrode lead-out structures, which complicates the assembly process.
Innovation Solution
The battery cell design includes a case assembly with separate first and second electrode lead-out portions located at one end, an end cover with a pressure relief portion, and a through hole for welding, allowing for simplified assembly and reduced complexity by separating the pressure relief portion and end cover structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the pressure relief portion is integrated with the end cover, then the structural integrity is improved, but the manufacturing complexity increases
Solution Approach 1:
The battery cell structure is divided into separate components: the end cover and the pressure relief portion are positioned at different locations rather than being integrated. The first electrode lead-out portion is located at one end while the pressure relief portion is positioned at another location, allowing independent manufacturing and assembly of these components, thus reducing manufacturing complexity while maintaining structural integrity through proper spatial arrangement.
2Quantity of substance
If both electrode tabs are arranged at the same end, then the energy density is improved, but the assembly complexity increases
Solution Approach 1:
A current collecting member is introduced as an intermediary component to connect the first electrode tab and the first electrode lead-out portion. This current collecting member simplifies the assembly process by providing a straightforward electrical connection path, reducing assembly complexity while allowing both electrode tabs to be arranged at the same end to improve energy density.
3Ease of manufacture
If the first current collecting member is welded through the through hole, then the welding difficulty is reduced, but the structural strength may be compromised
Solution Approach 1:
The welding operation is moved from a lateral approach (welding from the side of the first wall) to a longitudinal approach through the through hole. This dimensional change in the welding path allows for easier welding access and operation, reducing welding difficulty while the through hole is designed to maintain structural strength by preserving sufficient material around the hole perimeter.
Data Source
AI summary
The present application relates to a battery cell, a battery, and an electrical apparatus in the field of battery technologies. The battery cell includes a case assembly, an end cover, and an electrode assembly. The case assembly defines an accommodating cavity with an opening, and includes first and second electrode lead-out portions positioned at one end of the case opposite the opening along a first direction. The end cover seals the opening. The electrode assembly, positioned inside the cavity, includes a main body, a first tab, and a second tab of opposite polarity. Both tabs are arranged at one end of the main body away from the end cover and are electrically connected to the corresponding lead-out portions. The end cover includes a pressure relief portion configured to release internal pressure. This design facilitates the integration of pressure relief features and simplifies the structural arrangement of the battery cell.