Battery Tab Connection Structure With Non-Overlapping Collector Joints
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Solution Overview
Problem
Secondary batteries experience a decrease in current flowing capability due to poor connections between the tab and the current collecting member, leading to performance issues over multiple charge and discharge cycles.
Innovation Solution
A secondary battery design incorporating a transition connecting piece with a current collecting portion and a fixing portion, which forms separate connection regions with the tab and guiding section of the current collecting member, preventing overlap and reducing structural damage during connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the tab and current collecting member are directly connected to form a connection region, then the structure is simple, but the current flowing capability deteriorates due to poor connection quality
Solution Approach 1:
The patent introduces a transition connecting piece as an intermediary component between the tab and current collecting member. This transition piece includes a current collecting portion that connects to the tab and a fixing portion that connects to the current collecting member, creating separate first and second connection regions. This intermediary structure improves current flowing capability by providing dedicated connection zones for each interface, preventing the poor connection quality that occurs with direct connection.
Solution Approach 2:
The patent segments the connection structure into distinct regions: a first connection region between the tab and current collecting portion, and a second connection region between the fixing portion and current collecting member. By separating these connection zones and ensuring their projections do not overlap, the design allows each connection to be optimized independently, improving overall current flowing capability while maintaining structural clarity.
2Strength
If multiple connection operations are performed on the same tab region, then the connection strength increases, but the tab structure deteriorates due to overlapping connections
Solution Approach 1:
The patent resolves the conflict between connection strength and tab structure stability by transitioning from a two-dimensional overlapping connection approach to a three-dimensional separated arrangement. The first connection region and second connection region are positioned at different locations along the tab length, with their projections on a plane perpendicular to the length direction deliberately non-overlapping. This spatial separation in the longitudinal dimension allows multiple strong connections without compromising tab structural integrity.
Data Source
AI summary
The present application relates to a secondary battery and manufacturing method thereof, a battery module and an apparatus. The secondary battery includes an electrode assembly including a main body portion and a tab extending out from the main body portion; a current collecting member including a guiding section, which extends in a direction perpendicular to a length direction of the electrode assembly; a transition connecting piece, being separately provided from the current collecting member and including a current collecting portion and a fixing portion, the current collecting portion being adapted to connect with the tab to form a first connection region, the fixing portion being adapted to connect with the guiding section to form a second connection region, and respective projections of the first connection region and the second connection region on a plane perpendicular to the length direction do not overlap.