Battery Cell Current Collector Positioning for Stable Wall Connection
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Solution Overview
Problem
The existing electrical connections between the current collecting member and the wall portion in battery cells are prone to failure over time, affecting the service life of the battery cell.
Innovation Solution
A battery cell design featuring a protrusion on the current collecting member and a recess on the wall portion, which improves assembly efficiency and stability, ensuring a reliable electrical connection by limiting relative movement and enhancing the connection's firmness through welding and sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the current collecting member is directly connected to the wall portion without positioning structures, then the device complexity is reduced, but the connection stability and reliability deteriorate over time
Solution Approach 1:
The protrusion on the current collecting member acts as an intermediary positioning element that inserts into the recess on the wall portion. This intermediary structure establishes a stable mechanical connection between the current collecting member and the wall portion, preventing direct contact and potential instability while maintaining structural simplicity.
Solution Approach 2:
The protrusion is nested within the recess, creating a fit-and-socket connection. The protrusion fits into the recess like a nested structure, providing precise positioning and stable connection without adding external mounting hardware or complex assembly mechanisms.
2Reliability
If positioning structures (protrusion and recess) are added to the current collecting member and wall portion, then the connection stability is improved, but the device complexity increases
Solution Approach 1:
The positioning function is segmented into two distinct elements: the protrusion on the current collecting member and the recess on the wall portion. This segmentation allows each component to be optimized independently while working together to provide stable positioning, avoiding the need for complex integrated positioning mechanisms.
Solution Approach 2:
Instead of adding complex external positioning mechanisms to hold the current collecting member, the solution inverts the approach by integrating the positioning features directly into the components themselves - the protrusion extends from the current collecting member and the recess is formed in the wall portion, making the components self-positioning.
3Ease of manufacture
If the recess is designed as a through hole structure, then the manufacturing ease is improved, but the sealing requirement increases due to potential liquid leakage paths
Solution Approach 1:
The protrusion acts as an intermediary sealing element that blocks the through-hole recess from providing a direct liquid leakage path. By inserting the protrusion into the recess, the continuous open channel is interrupted, preventing electrolyte leakage while maintaining the manufacturing simplicity of the through-hole structure.
Data Source
AI summary
Embodiments of the present application provide a battery cell, a battery, an electrical device, and a method and device for manufacturing a battery cell. The battery cell includes a shell, an electrode assembly and a current collecting member. The shell has a wall portion located at one end of the shell in a first direction. The electrode assembly is accommodated in the shell and provided with a tab. The current collecting member is accommodated in the shell, and is configured to be connected to the wall portion and the tab to implement an electrical connection between the wall portion and the tab. A protrusion is provided on a side of the current collecting member facing the wall portion, and the wall portion is provided with a recess configured to accommodate at least a part of the protrusion to position the current collecting member.