Lithium-Ion Battery Case Cut Positioning for Short-Circuit Avoidance
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Solution Overview
Problem
Lithium ion secondary batteries pose challenges during disassembly due to potential voltage return after discharge to 0 V, making complete discharge difficult, and the risk of short circuits when cutting open the battery case, especially when batteries are unusable due to overcharge or overdischarge, and the location of the electrode body is hard to determine externally.
Innovation Solution
A lithium ion secondary battery design that includes a battery case with information on a cut position, such as marks, grooves, or steps, to facilitate safe cutting without damaging the electrode body, and a method involving preparation, determining the cut position, and cutting along these indicators to avoid short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the battery case is cut to open for disassembly, then the electrode body can be accessed for recycling, but the electrode body may be damaged causing short circuit between positive and negative electrodes
Solution Approach 1:
The patent applies preliminary action by providing cut position information on the battery case before disassembly occurs. This allows the cutting operation to be performed at the correct location that avoids the electrode body, preventing short circuits while enabling safe access for recycling. The information is prepared in advance on the battery case itself, guiding the disassembly process.
2Reliability
If the battery is discharged to 0 V before disassembly, then safety is improved by preventing short circuit from remaining charges, but the voltage may return making complete discharge difficult
Solution Approach 1:
The patent applies self-service by making the battery case provide its own cut position information directly on itself. This eliminates the need for external detection methods or complex discharge verification procedures. The battery case autonomously provides the necessary guidance information for safe cutting, simplifying the disassembly process while maintaining safety.
3Ease of operation
If the location of the electrode body is determined from outside the battery case, then the cutting process can be guided safely, but the location cannot be determined externally
Solution Approach 1:
The patent uses the cut position information as an intermediary that indirectly reveals the location of the electrode body. Instead of directly exposing electrode body location, the information indicates where to cut to safely access it. This intermediary approach provides the necessary spatial information for safe disassembly without requiring direct external detection of the electrode body itself.
Data Source
AI summary
Provided is a lithium ion secondary battery that facilitates cutting of a battery case without damage to an electrode body in disassembling the lithium ion secondary battery. A lithium ion secondary battery disclosed here includes an electrode body, an electrolyte, and a battery case housing the electrode body and the electrolyte. The battery case is provided with information on a cut position in disassembling the battery case.