Pouch Battery Cell Pressure Compensation for Electrode Swelling
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Solution Overview
Problem
The swelling phenomenon in secondary battery cells due to surface pressure imbalance leads to reduced lifespan and increased resistance, which existing compressible members fail to adequately address, especially when thickness deviations occur in the electrode assembly.
Innovation Solution
Incorporating a pressure compensation member between the electrode assembly and the pouch body, with distinct uniform and low thickness regions, to evenly distribute pressure and compensate for thickness variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uniform pressure distribution is achieved through pressure compensation members, then lifespan is increased, but device complexity increases
Solution Approach 1:
The patent reduces structural complexity by applying pressure compensation only where needed - specifically at low thickness regions of the electrode assembly. Rather than adding complex uniform pressure distribution mechanisms across the entire cell, the solution uses localized compensation members positioned according to the actual thickness distribution map of the electrode assembly.
Data Source
AI summary
The present disclosure provides a battery cell of the present disclosure including: an electrode assembly including a plurality of electrode plates and a plurality of separators; a pouch including a body portion accommodating the electrode assembly and a sealing portion sealing at least a portion of a circumference of the body portion; an electrode lead electrically connected to the electrode assembly; and a pressure compensation member disposed between the electrode assembly and the body portion, and the electrode assembly includes a uniform thickness region including a center of the electrode assembly, and a low thickness region disposed closer to the electrode lead than to the uniform thickness region, and the pressure compensation member is disposed between the low thickness region and an inner surface of the body portion in a thickness direction of the electrode assembly.