Battery Module Bush Member Impact Distribution
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Solution Overview
Problem
Existing high-power battery modules face issues with stress concentration and uneven impact distribution due to localized fixing structures, which can lead to instability and potential damage from external impacts.
Innovation Solution
A battery module design featuring bush members coupled to end plates with guide portions for uniform impact distribution, along with an end block to apply pressure to battery cells and a fixing member for secure attachment to a base plate, enhancing stability and ease of assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the end plate is designed with integrated structural elements for coupling battery modules, then the coupling strength between battery modules is improved, but the weight of the end plate increases due to over-design of basic material
Solution Approach 1:
The end plate structure is segmented into a base plate and separate coupling elements (bush members with guide portions). This allows the base plate to be optimized for its primary function of supporting battery cells while coupling elements provide the necessary mechanical strength for module connection, avoiding over-design of the entire end plate.
Solution Approach 2:
Bush members with guide portions act as intermediary elements between the base plate and the coupling mechanism. These intermediaries distribute mechanical loads and provide precise alignment features, enabling strong coupling without requiring the base plate itself to be overly robust.
2Ease of manufacture
If the battery module is fixed using localized fixing structures, then the assembly process is simplified, but stress concentration occurs at fixed portions leading to potential damage
Solution Approach 1:
The guide portions extend in a direction perpendicular to the main plane of the base plate, creating a three-dimensional structure that distributes fixing points across multiple dimensions. This spatial distribution of fixing points reduces stress concentration while maintaining assembly simplicity.
Solution Approach 2:
The end plate structure incorporates localized coupling elements (bush members) at specific positions rather than requiring the entire plate to be thick and robust. Each local region is optimized for its specific function, with coupling elements providing strength only where needed for fixation.
3Strength
If the end plate is made thicker to prevent bending and improve structural integrity, then the hardness against bending is improved, but the weight of the battery module increases
Solution Approach 1:
The structural reinforcement function is segmented from the base plate and assigned to separate coupling elements. The base plate maintains its lightweight construction while coupling elements (bush members with guide portions) provide the necessary mechanical strength and bending resistance at critical locations.
Solution Approach 2:
The end plate assembly functions as a composite structure combining a lightweight base plate with strategically positioned reinforcement elements. This composite approach achieves high bending resistance without the weight penalty of a uniformly thick plate.
Data Source
AI summary
A battery module according to the invention comprises a plurality of battery cells (110) stacked along a first direction, a pair of end plates (160) arranged spaced apart from each other in the first direction at respective end faces of the stacked battery cells (110), and at least one bush member (140) provided coupled to each end plate (160).