Detachable Pouch Cell Tab Interface for Reusable Protection Circuits
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The packaging of lithium polymer (Li-Po) batteries, particularly pouch cells, leads to increased electronic waste and inefficient component reuse due to direct welding of tabs to protection circuit modules, making it difficult to detach and recycle these modules at the end of their life.
Innovation Solution
The development of enhanced mechanical interfaces between battery protection circuitry and pouch cells, featuring releasable mechanisms such as lever-activated latching, screw, or spring mechanisms, allowing for detachable connections between tab terminals and circuit substrates, enabling the battery protection circuitry to be decoupled from the battery cells for reuse or recycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tabs are directly welded to protection circuit module, then electrical connection is reliable, but component reuse and recycling become difficult
Solution Approach 1:
The patent divides the electrical connection into two separable parts: a reusable protection circuit module with interface elements, and a battery cell with tab terminals. The connection is segmented such that the PCM can be detached from the battery cell, allowing the PCM to be reused with different cells while maintaining reliable electrical contact through dedicated interface elements during assembly.
2Strength
If direct welding is used to attach tabs to PCM, then connection strength is high, but electronic waste increases due to inability to recycle modules
Solution Approach 1:
The patent enables recovery and reuse of the protection circuit module by designing a detachable connection system. Instead of permanently welding the PCM to the battery cell tabs, the interface elements allow the PCM to be separated from spent cells and attached to new or refurbished cells, thereby recovering valuable electronic components and reducing e-waste.
3Ease of repair
If mechanical release mechanisms are added to enable detachment, then component reuse becomes possible, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical release mechanisms with a simpler electrical connection approach. The interface elements provide both electrical contact and mechanical retention through integrated design, eliminating the need for separate latches, clips, or release mechanisms while still enabling easy detachment and reuse of the protection circuit module.
Data Source
AI summary
Battery protection circuit configurations are discussed which are detachable from the corresponding battery when the battery is scrapped or discarded. An apparatus includes a circuit substrate having interface elements configured to couple to tab terminals of a battery cell and output terminals configured to carry electrical current for the battery cell with respect to an external circuit. Each of the interface elements comprise an electrical contact that conductively contacts a mating tab terminal of the battery cell, and a releasable mechanism configured to hold the mating tab terminal against the electrical contact based at least on being placed in a locked state, and allow release the mating tab terminal based at least on being placed in an unlocked state.