Battery Module Adhesive Layout for Pouch Cell Expansion Absorption
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery modules face challenges in simultaneously meeting the requirements of absorbing the expansion of pouch battery cell airbags while maintaining structural strength, as conventional adhesives fail to adequately address both aspects.
Innovation Solution
A battery module design featuring separate first and second adhesive blocks, where the first block absorbs airbag expansion with lower hardness for elasticity and the second block enhances structural strength with higher hardness, ensuring effective deformation compensation and structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single type of adhesive is injected at both ends of the battery module, then the adhesive can meet the strength requirements to prevent deformation, but it cannot adequately absorb the expansion amount of the airbag of the battery cells
Solution Approach 1:
The adhesive system is segmented into two distinct adhesive blocks with different properties. The first adhesive block (softer, lower hardness) is positioned at the airbag end to absorb expansion, while the second adhesive block (harder, higher strength) is positioned at the opposite end to provide structural strength. This segmentation allows each block to specialize in one function, resolving the contradiction between strength and expansion absorption.
Solution Approach 2:
Different regions of the battery module are assigned different adhesive properties tailored to local requirements. The first adhesive block has lower hardness and higher elasticity to match the expansion-prone airbag region, while the second adhesive block has higher hardness to match the structure-requiring end. This local quality differentiation enables simultaneous satisfaction of both expansion absorption and structural strength requirements.
2Adaptability or versatility
If the adhesive is made softer to absorb airbag expansion, then the expansion absorption capability is improved, but the structural strength at the ends of the battery module deteriorates
Solution Approach 1:
The adhesive system is divided into two segments with different hardness levels. The first adhesive block uses softer material (lower Shore C hardness, e.g., C1 30-50) to absorb airbag expansion effectively, while the second adhesive block uses harder material (higher Shore C hardness, e.g., C2 50-70) to maintain structural strength. This segmentation eliminates the need to compromise either property in a single adhesive.
Solution Approach 2:
The adhesive hardness is locally optimized for each position's functional requirements. The softer first adhesive block is applied where expansion occurs (airbag end), while the harder second adhesive block is applied where structural support is needed (opposite end). This local quality approach resolves the contradiction by making hardness position-dependent rather than uniform.
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 improves product quality by effectively absorbing airbag expansion and enhancing structural strength, thereby improving the stability and reliability of the battery module and pack.
Implementation Method 1
the first adhesive block wraps at least a part of the airbags... the hardness of the first adhesive block is less than the hardness of the second adhesive block... the first adhesive block and the second adhesive block may be selected with appropriate hardness according to requirements, thereby absorbing and compensating for the expansion amount of the airbag
Data Source
AI summary
The present disclosure relates to the field of power battery technology, and particularly relates to a battery module and a battery pack. The battery module includes a housing; multiple battery cells, the multiple battery cells stacked and arranged in the housing, the battery cells having airbags and tabs, at least a part of the tabs extending out of the airbags; a first adhesive block, located in the housing and distributed at the tab side of the battery cells, and the first adhesive block wrapping at least a part of the airbags; a second adhesive block, the second adhesive block located at one side of the first adhesive block facing away from the tab side of the battery cells, and connected with the housing.