Pouch Battery Electrode Lead Extension for Module Reuse
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Solution Overview
Problem
Conventional pouch type secondary battery modules face challenges in reusability due to the inability to non-destructively separate electrode leads joined by laser welding, resulting in insufficient electrode lead length for reconnection and reuse.
Innovation Solution
Incorporating a length extended part for electrode leads with a lead film and insulation tape, allowing for cutting and re-welding of electrode leads to form longer lengths, and optionally folding electrode leads for space efficiency, enabling the reuse of battery modules through modified connection structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrode leads are joined by laser welding to construct battery module, then connection strength and reliability are improved, but reusability deteriorates because the welded parts cannot be non-destructively separated
Solution Approach 1:
The electrode lead is segmented into multiple parts: a first electrode lead remaining on the pouch battery and a second electrode lead that can be separated. The laser welding is applied only to the first electrode lead, creating a reliable permanent connection, while the second electrode lead extends beyond the welding point to allow for non-destructive separation and reuse in different configurations.
2Adaptability or versatility
If electrode leads are cut after laser welding to separate connections, then reconfiguration is enabled, but electrode lead length becomes insufficient for reconnection
Solution Approach 1:
The second electrode lead is preliminarily extended beyond the laser welding point before any cutting or reconfiguration operations. This preliminary extension ensures that even after cutting the welded portion for separation, sufficient length remains to perform reconnection and welding operations during reuse, eliminating the length insufficiency problem.
3Adaptability or versatility
If electrode leads are extended to enable reconnection, then reusability is improved, but device complexity increases due to additional structures needed
Solution Approach 1:
The extended portion of the electrode lead is provided locally only where needed for separation and reconnection operations, rather than extending the entire electrode lead uniformly. This localized extension minimizes additional material usage and structural complexity while still achieving the reusability goal.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the construction of new battery modules with extended electrode lead lengths, facilitating reuse and maximizing resource utilization and cost efficiency, suitable for applications like electric vehicles and energy storage systems.
Implementation Method 1
laser welding L is applied to connect the electrode leads 40, 45
Data Source
AI summary
A pouch type secondary battery in which an electrode lead of the pouch type secondary battery and an electrode lead of an adjacent different pouch type secondary battery are welded together to construct a battery module is provided. The electrode lead of the pouch type secondary battery includes a length extended part so that, after cutting a welded part of the electrode leads of the pouch type secondary battery and the adjacent different pouch type secondary battery to form electrode leads of remaining length, the electrode leads of remaining length are welded together again. A battery module and method of reusing the battery module are also provided.