Battery Cell Venting Guide Structure for Delayed Case Unsealing
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Solution Overview
Problem
Existing battery cells face issues with reduced gas-accommodating capacity and premature unsealing due to uneven pressure distribution across sealing portions, leading to inefficient gas management and potential insulation breaches.
Innovation Solution
Incorporation of a venting guide member with guide grooves and tab lead-out holes, which uniformly distributes pressure across the sealing portions, delaying unsealing and increasing gas-accommodating capacity by maintaining consistent bonding forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If gas is generated inside the battery cell case during charging and discharging, then the pressure inside the case increases, but the sealing portion releases prematurely due to uneven bonding forces
Solution Approach 1:
The venting guide member is selectively positioned at specific locations on the case where bonding forces are weakest. This local reinforcement approach targets only the critical areas needing support, rather than uniformly strengthening the entire case, thus maintaining gas-accommodating capacity while preventing premature unsealing at vulnerable points
Solution Approach 2:
The venting guide member is installed on the case before the electrode assembly is inserted and before charging/discharging begins. This preliminary reinforcement ensures that when gas is generated and pressure increases, the sealing portions are already strengthened and ready to resist unsealing, delaying the release timing as intended
2Quantity of substance
If the case sealing is strengthened to delay unsealing, then gas-accommodating capacity increases, but the device complexity increases due to additional venting guide member
Solution Approach 1:
The venting guide member is divided into multiple separate pieces that are individually attached to different sealing portions of the case. This segmentation allows for targeted reinforcement at specific weak points without requiring a complex integrated structure, simplifying both manufacturing and assembly while achieving the desired delay in unsealing
Solution Approach 2:
The venting guide member acts as an intermediary component between the case and the sealing portion. It transfers and distributes the bonding forces more evenly across the sealing area, reducing the direct stress on the original sealing structure and allowing the case to accommodate more gas before unsealing occurs
Data Source
AI summary
A battery cell includes a case; an electrode assembly including a positive electrode, a negative electrode, and a separator, accommodated in the case; and a venting guide member having a guide groove therein into which a sealing portion of the case is at least partially inserted, and pressing the case to delay opening of the case.