Battery Cell Lead Film Dented Structure for Gas Venting Seals
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Solution Overview
Problem
Conventional battery cells face issues with gas venting and moisture penetration due to increased gas generation, leading to deteriorated performance and additional gas production.
Innovation Solution
A battery cell design featuring a lead film with dented portions that allow for improved gas emission and durability, including a first and second dented portion with varying widths and shapes to enhance gas discharge while maintaining airtightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If energy density of the battery cell is increased, then battery performance is improved, but the amount of gas generated inside the battery cell increases
Solution Approach 1:
The patent converts the harmful gas generation into a beneficial venting mechanism by designing the lead film with a dented portion that acts as a controlled venting path. The dented portion allows gas to be discharged externally through the sealing portion without causing damage to the battery cell, thus converting the harmful effect of gas generation into a controlled release mechanism.
Solution Approach 2:
The dented portion of the lead film serves as an intermediary structure between the battery assembly and the external environment. It provides a controlled interface for gas discharge, mediating between the internal pressure buildup and external release, preventing direct damage while allowing necessary venting.
2Stress or pressure
If gas venting occurs in the battery cell, then gas pressure is released, but moisture penetrates into the battery cell causing side reactions
Solution Approach 1:
The lead film with dented portion acts as a flexible sealing structure that maintains airtightness while allowing controlled venting. The dented portion is designed to deform under pressure, creating a one-way valve effect that allows gas to escape but prevents moisture from entering, thus maintaining the protective function of the sealing portion.
Solution Approach 2:
Instead of trying to prevent gas generation entirely, the patent inverts the approach by creating a controlled entry point for gas discharge. The dented portion is specifically designed to allow outward gas flow while the sealing structure prevents inward moisture penetration, effectively inverting the normal sealing function to accommodate venting needs.
3Ease of manufacture
If conventional sealing structure is used, then manufacturing is simple, but gas discharge capability is insufficient
Solution Approach 1:
The dented portion is pre-formed in the lead film during manufacturing, creating a built-in venting capability before the battery cell is assembled. This preliminary structuring ensures that gas discharge pathways are already in place, eliminating the need for additional venting components or complex sealing modifications.
Data Source
AI summary
A battery cell includes a battery case having an accommodation portion in which an electrode assembly is mounted, and a sealing portion formed by sealing an outer periphery thereof, an electrode lead electrically connected to an electrode tab included in the electrode assembly and protruding out of the battery case via the sealing portion, and a lead film located at a portion corresponding to the sealing portion in at least one of an upper portion and a lower portion of the electrode lead. The lead film has a dented portion that is recessed in an outer direction of the battery case, the dented portion is opened toward the inside of the battery case, the dented portion includes a first dented portion and a second dented portion, and a width of the second dented portion is greater than a width of the first dented portion.