Battery Module Side Plate Pressurization for Cell Swelling Imbalance
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Solution Overview
Problem
Swelling in secondary battery cells due to electrochemical reactions or gas generation under high-temperature conditions leads to deformation and reduces the lifespan of battery cells and modules, causing surface pressure imbalance and rapid capacity drop or resistance increase.
Innovation Solution
A battery module design incorporating a pressurizing member on the side plate to apply pressure to the electrode lead area, compensating for thickness deviations in the electrode assembly and maintaining uniform pressure distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a compressible pad is placed around the battery cell to alleviate surface pressure imbalance, then the lifespan of the battery cell is extended, but the device complexity increases and energy density is reduced
Solution Approach 1:
The patent applies local quality by positioning the pressurizing member specifically at the electrode lead area where thickness deviation occurs, rather than uniformly distributing compression around the entire battery cell. This localized approach addresses the specific problem area while minimizing overall structural complexity and space consumption.
Solution Approach 2:
The pressurizing member is segmented into multiple regions with different compression forces: a first region with higher compression force applied to the electrode lead area, and a second region with lower compression force applied to other areas. This segmentation allows differential pressure application to address local thickness deviations without requiring a completely separate structural system.
2Reliability
If a compressible pad is placed around the battery cell to alleviate surface pressure imbalance, then the lifespan of the battery cell is extended, but the energy density is reduced
Solution Approach 1:
The pressurizing member provides localized compression only where thickness deviation occurs (electrode lead area), rather than requiring uniform compression around the entire battery cell. This reduces the volume occupied by compression components, thereby minimizing the impact on energy density while still extending battery lifespan through targeted pressure application.
Solution Approach 2:
The pressurizing member is divided into a first region and a second region, where the first region (higher compression) is positioned at the electrode lead area and the second region (lower compression) is positioned elsewhere. This segmentation optimizes the distribution of compression force, applying pressure only where needed to address thickness deviation, thus reducing the overall space required for compression components and minimizing impact on energy density.
3Stability of the object's composition
If uniform compression is applied to the battery cell, then swelling is controlled, but surface pressure imbalance due to thickness deviation cannot be fully resolved
Solution Approach 1:
The pressurizing member is segmented into a first region and a second region with different compression forces. The first region applies higher compression force to the electrode lead area where thickness deviation occurs, while the second region applies lower compression force to other areas. This segmentation enables differential pressure application that simultaneously controls overall swelling and resolves local surface pressure imbalance.
Solution Approach 2:
The pressurizing member provides localized quality by applying different compression forces to different regions of the battery cell. The electrode lead area receives higher compression from the first region, while other areas receive lower compression from the second region. This local quality approach resolves surface pressure imbalance caused by thickness deviation while maintaining overall swelling control.
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
The design extends the lifespan of battery cells by reducing surface pressure imbalance, limiting capacity deterioration, and resistance increase, while maintaining energy density.
Implementation Method 1
a pressurizing member disposed on an inner side of the side plate and configured to apply pressure to a portion of the cell assembly adjacent to the electrode lead
Data Source
AI summary
A battery module includes a cell assembly including a plurality of battery cells, each battery cell including a body portion configured to accommodate an electrode assembly and an electrode lead electrically connected to the electrode assembly, the plurality of battery cells being arranged relative to each other in a first direction; a side plate extending to be disposed on at least one side of the cell assembly in the first direction; and a pressurizing member disposed on an inner side of the side plate and configured to apply pressure to a portion of the cell assembly adjacent to the electrode lead.