Battery Cell Lead Film Venting for Airtight Gas Discharge
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Solution Overview
Problem
Conventional battery cells lack an effective mechanism to externally discharge gas generated inside, leading to potential venting and moisture ingress, which can cause performance deterioration and additional gas generation.
Innovation Solution
A battery cell design featuring a lead film with a gas discharge portion extending from the inside to the outside of the battery case, sealed by an inner layer with a higher melting point and non-reactive materials, ensuring a maximized gas permeation area and preventing electrolyte leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If energy density of the battery cell is increased, then battery performance is improved, but gas generation inside the battery cell increases
Solution Approach 1:
The patent extracts the gas discharge function from the sealing portion by introducing a separate lead film with a gas discharge portion. This lead film is positioned between the electrode lead and the sealing portion, creating a dedicated pathway for gas to escape from the battery cell without compromising the sealing integrity or battery performance.
2Object-generated harmful factors
If gas discharge component is added to the battery cell, then gas emission is improved, but airtightness may be compromised
Solution Approach 1:
The lead film is positioned locally at the sealing portion between the electrode lead and the sealing portion, creating a localized gas discharge pathway. This localized approach allows gas to be discharged from specific areas where it accumulates without compromising the overall airtightness of the battery cell sealing.
3Object-generated harmful factors
If lead film with gas discharge portion is positioned at the sealing portion, then gas discharge is maximized, but structural complexity increases
Solution Approach 1:
The patent merges the gas discharge function with the existing electrode lead structure by positioning the lead film containing the gas discharge portion directly at the sealing portion where the electrode lead passes through. This integration allows gas discharge without adding separate complex structural components.
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
Enhances external gas emission, maintaining airtightness and preventing electrolyte leakage, thereby improving battery performance and safety by effectively discharging excess gas.
Implementation Method 1
the lead film includes a gas discharge portion formed to extend from the inside of the battery case to the outside of the battery case
Implementation Method 2
a sealing portion formed by sealing an outer periphery thereof by heat fusion
Data Source
AI summary
Disclosed is a battery cell, which includes a battery case having an accommodation portion in which a battery assembly is positioned, and a sealing portion formed by sealing an outer periphery thereof by heat fusion; an electrode lead electrically connected to an electrode tab included in the battery assembly, the electrode lead protruding out of the battery case through the sealing portion; and a lead film positioned adjacent to the sealing portion on at least one of a first side and a second side of the electrode lead, wherein the lead film includes a gas discharge portion formed to extend from an inside of the battery case to an outside of the battery case, and the gas discharge portion is opened on a side disposed inside of the battery case.