Vehicle Battery Pack Base Plate for Collision Energy Absorption
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Solution Overview
Problem
Existing battery packs for vehicles face challenges in protecting high-voltage batteries from impact loads while maintaining a lightweight design, as thick side beams are required to prevent deformation, leading to increased weight.
Innovation Solution
A battery pack design featuring a base plate with a protection region and a deformation region, where the base plate extends to the deformation region, allowing the base plate to absorb collision energy and prevent deformation of the protection region, thereby reducing the need for thick frame members and minimizing weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a thick side beam is formed to protect the battery module from collision loads, then the protection capability is improved, but the weight of the battery case is increased
Solution Approach 1:
The base plate is divided into a protection region (where the battery module is located) and a deformation region (at the outer edge). This segmentation allows the deformation region to absorb collision energy through controlled deformation, protecting the battery module without requiring the entire base plate to be thick and heavy.
Solution Approach 2:
The base plate has different structural properties in different regions: the protection region maintains high strength and rigidity to protect the battery module, while the deformation region is designed to deform easily to absorb impact energy. This local differentiation of material properties enables effective protection with reduced overall weight.
2Stability of the object's composition
If the base plate is made thick to prevent deformation under collision load, then the structural integrity is improved, but the weight is increased
Solution Approach 1:
The base plate is segmented into regions with different thicknesses and structural characteristics. The protection region maintains sufficient thickness for structural integrity, while the deformation region has reduced thickness to enable energy absorption through deformation, reducing overall weight.
Solution Approach 2:
Instead of preventing all deformation, the design allows controlled deformation in the deformation region to absorb collision energy. This converts the harmful effect of deformation into a beneficial energy absorption mechanism, protecting the battery while reducing the need for a uniformly thick base plate.
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
This design effectively protects the battery from collision loads while reducing the overall weight of the battery pack by distributing the load through the base plate's deformation region, preventing deformation of the protection region and maintaining the structural integrity of the battery case.
Implementation Method 1
a deformation region located on an outer side with respect to the sealing member... collision energy is absorbed by a deformation of the tray deformation region
Data Source
AI summary
A battery pack is mounted on a vehicle. The battery pack has a battery, and a battery case accommodating the battery. The battery case includes a base plate on which the battery is placed, a frame member joined to an outer edge of the base plate, and a cover covering the battery and attached to the frame member via a sealing member. The frame member includes a protection region located on an inner side with respect to the sealing member, and a deformation region located on an outer side with respect to the sealing member. The base plate is joined to the frame member in the protection region, and a tip end of the base plate extends to at least the deformation region when viewed in a cross section.