Battery Module End Plate Layout for Expansion Load Strength
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Solution Overview
Problem
The end plate in battery modules experiences low strength due to expansion forces from batteries, leading to potential breakage and reduced assembly reliability.
Innovation Solution
The end plate design includes end plate mounting holes with a first distance greater than a second distance from the inner and external walls, along with strengthening ribs and cavities, to distribute forces and enhance structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the end plate is provided with end plate mounting holes for assembling battery modules, then the ease of manufacture and assembly is improved, but the strength of the end plate is reduced due to stress concentration at the hole position
Solution Approach 1:
The end plate is designed with non-uniform thickness, where the thickness at the mounting hole position is greater than the thickness at other positions. This local quality enhancement provides additional structural support at the stress concentration area while maintaining overall ease of assembly. The increased thickness at the hole position redistributes the expansion stress from the battery, preventing breakage while preserving the mounting functionality.
2Strength
If the end plate mounting hole is positioned closer to the inner wall to reduce deformation, then the strength is improved, but the distance from the external wall increases reducing assembly stability
Solution Approach 1:
Instead of adjusting the horizontal position of the mounting hole along the length direction, the solution moves to another dimension by varying the thickness of the end plate in the width direction. The end plate has different thicknesses at different positions: greater thickness at the mounting hole position for strength, and appropriate thickness elsewhere for assembly stability. This dimensional approach allows simultaneous optimization of both strength and assembly reliability.
Data Source
AI summary
The present disclosure provides a battery module, comprising: a plurality of batteries stacked in a length direction L of the battery module; and an end plate located at an end of the plurality of batteries in the length direction L. The end plate is provided with at least one end plate mounting hole, and each of the at least one end plate mounting holes extends along a height direction H of the battery module. The end plate includes an inner wall and an external wall that are disposed opposite to each other in the length direction L, and an axis of each of the at least one end plate mounting holes includes a first distance L1 from the inner wall and a second distance L2 from the external wall. The first distance L1 is greater than the second distance L2.