Battery Lower Box Side Beam Reinforcement for Lateral Impact
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Solution Overview
Problem
The side beam of a battery box deforms severely upon lateral impact, compressing the battery cell and causing thermal runaway, compromising the safety of the battery.
Innovation Solution
A lower box body with a reinforcing structure and fasteners that penetrate the side beam and bottom protection plate, enhancing structural strength and reducing deformation upon impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the side beam structure is simplified for ease of manufacture, then manufacturing cost and complexity are reduced, but the side beam strength and resistance to lateral impact are insufficient
Solution Approach 1:
The side beam is divided into multiple sections with reinforcing structures at specific locations. The reinforcing structure includes vertical reinforcing ribs and horizontal reinforcing ribs that segment the side beam wall, creating multiple smaller structural units that collectively enhance strength while maintaining manufacturability of each segment.
Solution Approach 2:
Reinforcing structures are strategically placed at specific locations where impact forces are most likely to occur, such as at the corners and along the length of the side beam. This local reinforcement provides enhanced strength exactly where needed without requiring the entire side beam to be uniformly thick or complex.
2Strength
If the side beam is made thicker to increase strength, then resistance to lateral impact is improved, but the deformation amount under impact increases and manufacturing complexity increases
Solution Approach 1:
The side beam wall is segmented into multiple sections by vertical and horizontal reinforcing ribs. This segmentation creates a grid-like structure that distributes impact forces across multiple reinforcement points, preventing concentrated deformation in any single area and maintaining overall shape stability under lateral impact.
Solution Approach 2:
The side beam employs a composite structure combining the base beam material with reinforcing ribs of potentially different materials or treatments. This composite approach optimizes the balance between strength, deformation resistance, and manufacturing considerations by selecting appropriate materials for each component.
3Strength
If reinforcing structures are added to the side beam, then structural strength and impact resistance are enhanced, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The reinforcing structure is integrated with the side beam as a unified component rather than separate attachments. The vertical and horizontal reinforcing ribs are formed as part of the side beam structure itself, merging multiple functions (structural support, impact resistance, shape maintenance) into a single integrated component that reduces assembly complexity.
Solution Approach 2:
The reinforcing structure serves multiple functions simultaneously: it enhances structural strength, resists lateral impact, maintains shape stability, and provides attachment points for fasteners. This multi-functionality reduces the need for separate components and simplifies the overall device design.
4Strength
If fasteners penetrate through the side beam and bottom protection plate, then assembly strength is improved, but the risk of compressing the battery cell during assembly increases
Solution Approach 1:
The fastener system uses the reinforcing structure as an intermediary element between the side beam and bottom protection plate. The fasteners attach to the reinforcing ribs rather than penetrating directly through the battery cell area, distributing the clamping force across multiple reinforcement points and preventing concentrated pressure that could compress the battery cell.
Solution Approach 2:
The fastening system is segmented into multiple attachment points distributed along the reinforcing structure. This segmentation distributes the assembly forces across multiple locations rather than concentrating them at single points, reducing the risk of localized battery cell compression while maintaining overall assembly strength.
Data Source
AI summary
This application provides a lower box body of a battery, the battery, and an electric apparatus. The lower box body of a battery includes a bottom protection plate; a side beam, where the bottom protection plate and the side beam jointly define a mounting space for mounting a battery cell of the battery, an assembly cavity is provided in the side beam, a reinforcing structure is disposed in the assembly cavity, and the reinforcing structure and the side beam are integrally formed to divide the assembly cavity into a plurality of sub-cavities; and a fastener, where the fastener penetrates a bottom wall of the side beam and the bottom protection plate and is connected to the reinforcing structure, so as to assemble the bottom protection plate at the side beam.